METHOD STATEMENT GMS Ben Luc Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 DRAINAGE AND OTHER WORKS TABLE OF CONTENTS I CONSTRUCTION METHOD FOR PILE CULVERT, BOX CULVERT[.]
GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 DRAINAGE AND OTHER WORKS PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 TABLE OF CONTENTS I CONSTRUCTION METHOD FOR PILE CULVERT, BOX CULVERT II DETAIL CONSTRUCTION METHOD FOR DITCH AND SURFACE DRAINAGE III DETAIL CONSTRUCTION METHOD FOR RELOCATION OF EXISTING IRRIGATION CHANNELS IV DETAIL CONSTRUCTION METHOD MANHOLES, INLETS, AND OUTLETS FOR V CONSTRUCTION OF ROAD SIGNS VI IMPLEMENTATION OF ROAD MARKINGS VII SODDING CATCH BASINS, VIII CONSTRUCTING MORTARED STONEWORK STRUCTURES PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 I CONSTRUCTION METHOD FOR PILE CULVERT, BOX CULVERT Description This section described construction method for constructing new reinforced concrete pipe culverts, reinforced concrete box culverts, underpass box culverts and storm water drains This work shall include headwalls, inlet and outlet structures and reinforced concrete pipe cradles, as well as associated erosion and scour protection works The Contractor will build all of works in accordance with the Drawings and Specification and at the locations indicated by the Project Managerthe Engineer The pile culvert and box culvert will built in Package 5(Km32+600 - Km42+00): No Type culvert amount (piece) Culvert head/length (m) Pipe culvert Ф1.5m 27 Pipe culvert Ф1.0m 82.5 Box culvert 2,0x2,0m 28 Box culvert 6,0x4,0m 31 Box culvert 2.5x2.5m 28 Irrigation Channel Relocation 555.8 Reference Standards 22TCN159-86 Specifications for construction and acceptance of precast reinforced concrete TCVN 9116:2012 Pre-cast RC box culvert Technical requirements TCVN 9113:2012 Drainage reinforced concrete pipe TCVN 4453 – 1995 Monolithic concrete structure – Norm of construction and acceptance The construction of reinforced concrete box culverts, head walls, inlets, outlets and other reinforced concrete drainage structures shall be in accordance with the provisions of Section “Concrete and Concrete Structures” Material requirements 3.1 Concrete Concrete used for all structural work described in this Specification section shall be of the classes indicated on the Drawings and shall conform to the requirements specified in Section “Concrete and Concrete Structures” PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 All finished surfaces of concrete, which are not permanently covered shall; have a smooth fair finish, be even and free from waves, be finished true to line/levels and contours, be free of blow holes, be free of honeycombing and air bubbles and the like Any holes left by bolts used to position the formwork shall be filled in with epoxy grout flush with the surrounding surfaces 3.2 Reinforcing Steel for Concrete All reinforcing steel used in the works shall conform to the requirements specified in Section, “Reinforcing Steel and steel works” 3.3 Bedding Granular material for bedding shall be in accordance with Paragraph 4.2, Table of Vietnamese Standard TCVN 7570-2006 and subject to the approval of the Engineer Lean concrete for bedding shall be class CIO bedding or blinding concrete in accordance with the requirements of Specification Section “Concrete and Concrete Structures” 3.4 Stone Masonry Stone Masonry and mortar used in the works shall conform to the requirements specified in Section “Stone Masonry” 3.4 Porous Backfill or Filter Material In case of requirement in drawings, Porous Backfill or Filter Material shall be in accordance with the provisions of Section “Porous drainage and Backfill” or as directed by the Project Managerthe Engineer 3.5 Backfill Filling material used in the works shall conform to the requirements specified in section “Excavation and Backfill for structure” 4.1 Detail construction method for pipe culvert, box culvert and underpass box culvert Preparation for construction The Contractor shall furnish shop drawings containing the constructions details for culverts and concrete drains indicated on the Drawings and as directed by the Project Managerthe Engineer Shop drawings shall be submitted to the Project Managerthe Engineer prior to the start of the construction of culverts and concrete drains Construction of culverts and concrete drains shall begin only after the Project Managerthe Engineer gives approval of the shop drawings to the Contractor Temporary drainage work shall be in place and operating before beginning embankment works, or as directed by the Project Managerthe Engineer PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 No subgrade preparation or pavement overlay work (either in the road or the shoulder areas) shall commence until the culverts, headwalls, and other minor structures below the subgrade level along that particular section of the project are complete 4.2 Construct for Precast Concrete Elements Precast Pipe culvert, precast bearing including Pipe culvert D1000, D1500, bearing indicate in design drawings Reinforced Concrete Culverts shall be precast reinforced concrete class C25 and shall conform with Specification Section “Concrete and Concrete Structures” Pipes shall be laid with male/female joints and reinforcement in all pipes shall consist of spiral steel cages with longitudinal bars all as indicated on the Drawings unless otherwise approved by the Engineer Bearings to support the pipes shall be of the numbers and types indicated on the Drawings and subject to the approval of the Engineer They shall be of precast reinforced concrete of concrete class C20 and shall conform with Specification Section “Concrete and Concrete Structures” No precast concrete products shall be cast until the Engineer has approved the manufacturing plant and the equipment therein The Contractor shall ensure that no damaged precast concrete items are taken to Site or installed on Site Damage is deemed to include, inter alia, honeycombing, chips, cracks and blemishes in appearance In the event the precast concrete items are damaged they shall be removed from the Site and never used in the Works No repairs or patching will be accepted by the Engineer whether the damage occurs on the Site or before or after delivery to Site The Engineer shall periodically inspect the precast concrete manufacturing plants to ensure compliance with the approved method statements for manufacturing The Contractor will supply material samples for laboratory testing to ensure quality compliance and will make the necessary arrangements to facilitate the inspections by the Engineer Such inspections shall include the inspection of reinforced precast concrete items All precast items shall be marked with a unique reference and no item shall be delivered to the construction Site without approval from the Engineer In order to maintain the quality of the precast concrete items the Contractor shall cast these in a factory off the Site Execution of concrete, reiforced steel, formwork comply with the requirements specified in section “Concrete and Concrete Structures” Execution order is described as followings: 4.2.1 Preparation of casting area: Units are casted in flat area, enough large to cast concrete and placing material PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 The casting area is leveled and compacted to not be subside during casting and placing material as well as moving eqiupment and crane for installation units The casting area is reinforced with concrete, thickness of concrete layer 10-15cm 4.2.3 Preparation for material All material for executing units, design for component of concrete mixture must be approved by Project Manager prior to put in to use and comply with the requirements as indicated in article above 1.3 – “Material requirements” 4.2.4 Reinforced steel works Reinforced steel is processed as Design Document which has been approved by Project Manager Steel is worked in to set for each culvert units Quantity of set for pouring concrete daily must be accepted by Project Manager prior to the start of the execute of concrete Reinforced steel works conform to the requirements specified in section TCVN 5709:2009 (Hot-rolled cacbor steel uses on construction) conform to the requirements as indicated section, “Reinforcing Steel and steel works” Installation of reinforced steel in to casting mould must ensure the requirement for thickness of protective concrete layer as specified in Design Document Use the trestle to control the thickness of protective concrete layer (if necessary) The trestle is made of material which assures the intensity and is similar colour to concrete and approved by Project Manager 4.2.5 Formworks: Formworks and preparation of formwork conform to the requirements specified in section “Concrete and Concrete Structures” Formwork for precasting concrete must use shaped formwork and made of shaped steel and flat steel sheet When installation, the formwork will be lubricated with anti-adhesive material The anti-adhesive material must be colourless and approved by Project Manager before using Installed-formworks ensure be firm and stable during placing concrete The slab of formwork must be sealed to ensure not to loss the cement water during placing and compacting concrete The forwork is removed as having result of testing sample for concrete intensity.The minimized intensity of concrete for removal formwork is approved by Project Manager in the first test 4.2.6 Place and compaction of concrete: Concrete is mixed by mixer according to mix design approved by Project Manager PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Concrete need to tested the slump before placing, sampling under witnessed by Project Manager or authorized person After pouring concrete on formwork, will be compacted with specialized equipment These equipments operate inside the narrow formworks, ensuring not to displace the steel bars or trestle The vibrator equipments attach outer surface of formwork are encouraged to use Process of pouring and compacting concrete conform to the requirements specified in section “Concrete and Concrete Structures” 4.2.7 Concrete curing Methods ang processes of concrete curing conform to the requirements specified in section “Concrete and Concrete Structures” 4.2.8 Loading, transporting of concrete unit Concrete units are only allowed to move out of casting area in case of concrete compressive strength for each sample in lift of concrete meets 80% minimum compare with the requirement concrete strength for one unit Concrete units are put up and down carefully They will be transported vertically to avoid impacting, bearing points and direction of reaction when transporting and storing are as same as the last installation stage All concrete units will be marked separate and permanent to write clearly type of concrete unit and date of concrete 4.3 Construction of pipe culvert, box culvert at the site 4.3.1 Construction plan and organization The positions of box culverts are for construction of service road; the service road contractor shall carry out construction of entire culvert length At the culvert positions that the service road or pipe culvert can not be constructed, the contractor shall ensure transport by construction of 1/2 the lower culvert first After that, the remained 1/2 culvert in the lower section shall be constructed; these culvert shall be strengthened and opened to its edges by disposed stone or gravel aggregate foundation The service road shall be large enough for directionally safe traffic movement The service road shall be arranged with sufficient signal posts, signal plate, lighting (at night) with traffic control staffs at ends continually during construction period Horizontal drainage culvert shall be arranged temporarily for not affecting the culvert construction activities as well as the existing discharge flow of the road, residential area and irrigational activities 4.3.2 Excavation of culvert trench Excavation of culvert trenches will execute conform to the requirements specified in section “Excavation and backfill for structure” PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Construction method and construction order as follows: 4.3.3 - Located the centre of culver, scope of trenches as Design Drawings; - Removal of old structures (if any); - Excavation of trenches by excavator, and using man-power for completing trenches Transporting waste material to regulated area - Excavation of trenches with enough large (500 mm minimum from road margin which around the culvert) in order to execute body culvert and embank both sides of culvert Slope of trenches will be executed comply with stability of trenches’s geology - Constructing culvert at the location where water flows frequently will be use cofferdam in method of constructing trenches It will be needed to construct a small ditch system around inlet to collection water and use pump to pump water out of trenches - When excavating to the trenches bottom, if the weak geological layer is found, the contractor shall inform the Engineer for on-time solution to keep progress - If the soil in the trenches is mixed with quarry stone then the over elevated excavated area shall be backfilled by materials of little deformation under pressure as sand, gravel sand or concrete with the same mark with the trenches and shall be in compact with the foundation The material type and compact requirements shall be in accordance with regulated design documents or with the instructions from the Engineer - Structures of blinding stone and concrete of culvert foundation will be only allowed install when trenches be executed as Design Drawings, be accepted by Project Manager Instalation of precast units The Contractor shall lay reinforced concrete cradles and pipes carefully The hubs or grooved ends shall be up grade The spigots or tongued ends shall be fully entered into the adjacent hub or groove and be true to the required lines and grades Before laying succeeding sections of reinforced concrete pipe which not require cambering, the Contractor shall plaster the lower half of the hub of the preceding sections on the inside with Portland cement mortar The mortar shall be sufficiently thick to bring the inner surface of the abutting pipes flush and even The Contractor shall plaster the upper half of the spigot of the succeeding pipe with mortar at the same time All Pipe or Box Culverts shall be laid and fitted together such that the joint sealant forms a full and effective seal around the full circumference of the Pipe or the Box PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Culverts Joint sealants shall be placed such that any joints or overlaps in the sealant are at the top of the Pipe or the Box Culverts After laying the reinforced concrete pipe, the Contractor shall fill the remainder of the joint with sufficient mortar to form a bead around the joint The Contractor shall wipe the inside of the joint and finish it to a smooth and even surface The mortar on the outside shall be cured and remain damp for two days or until the Project Managerthe Engineer allows backfilling to proceed 4.3.4 Culvert Headwalls, Inlets, and Outlets Unless otherwise shown on the Drawings, the Contractor shall construct all culvert aprons, wing-walls, and headwalls using reinforced concrete of the class indicated on the Drawings and in accordance with requirements and provisions of section “Concrete and Concrete Structures” Scour protection works will normally be mortared rip-rap unless indicated in the Drawings 4.4 Construction of in-situ box culvert After constructing culvert trenches as described in article 1.4.3 (b), Work items for executing in-situ box culvert and underpass box culvert comply with order as follows: - Spreading blinding stone for culvert foundation; - Construction of bedding stone and foundation lean concrete; - Installation of reinforced steel, pouring concrete for bottom slab of body box culvert; - Installation of reinforced steel, pouring concrete for bodywall and face slab of culvert; - Execution of headwalls, wingwalls, structure of inlets, outlets - Execution of mortar stone structure, reinforcing slope of headculvert, reinforcing to unti – erosion of culvert downstream - Installation of over slab when filling soil to design elevation All works for executiong concrete, reinforced steel, formwork conform to the requirements specified in section “Concrete and Concrete Structures” Furthermore, these works need to comply with specific requirement as follows: Reinforcement erection in accordance with the design drawings The steel bars are discalced and cleaned Reinforcement connection methods as welding or binding shall be carried out right in accordance with regulations Reinforcement frames, fenders or rebars shall be laid on the skids; the cement skids have the similar thickness to the protection concrete thickness; the steel cable shall be lined in the skids to bind them on the reinforcement The skids laid on the suitable positions basing on the reinforcement density but not over 1m from a skidding place The salvage shall not be used to skid the outer surfaces of the structures Frame and fender of the reinforcement PHUONG THANH TRANCONSIN GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 shall be binded tightly and not deflecting when installed in the platform and during concrete casting The pre-erected parts not affect to the parts erected afterwards The reinforcement installation shall be accepted by the SC before concrete casting Erection of the reinforcement platform: Before erection, the platform shall be cleaned and an anti-adhesive oil layer shall be applied The platform shall be erected by crane in cooperation with manpower and closely connected by bolts It shall be noted to erect the scaffolding and bearing braces to ensure the stability of the platform during concrete casting The cleats shall be arranged for easy disassembling of the scaffolding and platform when the concrete reaches the allowed strength Concrete casting and vibration: Equipments and materials as well as manpower shall be checked before concrete casting The materials shall be sufficient for continuous concrete casting and the concrete batching machine shall operate well - Concrete casting-in-situ shall be done by batching machine and crane Concrete shall be casted in the silo right after poured out from the batching machine Crane shall be used to take to concrete to right place - During casting, sample shall be taken to test the slump of the concrete for adjustment as in the design Sample shall be casted for later test The aggregate measurement system shall also be checked to ensure the design batching ratio for concrete - Concrete transference chute shall not be over dip, the free falling height of the concrete shall not be overt 1m because of making concrete stratification - The upper concrete layer shall be casted and vibrated before the concrete layer below starts to freeze - Concrete shall be well vibrated right after casted - If the needle vibrator and plate vibrator are used, then the maximum thickness of the concrete layer shall be as follows: - If the needle vibrator is used, the concrete layer thickness shall be by 1.25 of the effective length of the needle arm If the plate vibrator is used, the concrete layer thickness shall be 12cm for the structure with much reinforcement, or shall be 25cm for the nonreinforcement structure The distance for needling the vibrator shall not exceed 1.5 time of the effective radius of the vibrator The vibrator shall not penetrate to the lower concrete layer casted before, if this layer is freezing If the plate vibrator is used, then the vibrating marks shall overlapped by 5cm Vibrating through the reinforcement shall not be done PHUONG THANH TRANCONSIN 10 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 water to flow through the cleaned culvert after the Project Managerthe Engineer inspects and approves the culvert II DETAIL CONSTRUCTION METHOD FOR DRAINAGE Description DITCH AND SURFACE This work shall consist of furnishing, constructing and/or installing side drainage types of structures built, slope drainage types of structures built in conformance with the Contract Drawings Included are such items as trapezium shaped, rectangle shaped, and bench ditch, stepped drop, ditch at top of slope Materials requirement To construct roadside Ditches using mortared stonework, concrete, reinforced concrete, or precast concrete as shown on the Drawings or directed by the Engineer The Contractor shall submit to the Engineer, for his approval, details and samples of materials he intends to use for the construction of Ditches 2.1 Bedding: Granular material for bedding shall be in accordance with Paragraph 4.2, Table of Vietnamese Standard TCVN 7570 - 2006 and subject to the approval of the Engineer Lean concrete for bedding shall be class C10 bedding or blinding concrete in accordance with the requirements of Specification Section “Concrete and Concrete Structures” 2.2 Mortared Stone: Mortared stonework shall conform with the requirements of Specification Section “Mortared Stonework” 2.3 Concrete: Precast and cast in situ concrete for side drainage structures, shall conform to the requirements of section “Concrete and concrete structure” 2.4 Reinforcing Steel for concrete: All reinforcing steel shall conform with the requirements specified in Specification Section “Reinforcing Steel” 2.5 Rip-rap: Rip-rap for side drainage structures shall conform to the requirements of section “Mortared Stonework” Method of Construction 3.1 Site Preparation PHUONG THANH TRANCONSIN 12 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Drainage excavation is combined with embankment excavation, and then the drainage form shall be fixed manually Drainage before construction shall be cut off with abundant soil, the jumping compactor shall be used to compact the drainage bedding, assuring the gradient, compactness and the flat of the slope and drainage groove in conformity with the design Positioning for pipe driving and line stretching to create the form and limited surface, in parallel with the flat surface, shall be carried out Drainage foundation excavation shall conform to the requirements of Section “Excavation and backfill for structure” 3.2 Construction side drainage concrete Construction side drainage concrete, shall conform to the requirements of section “Concrete and concrete structure” Basic construction order as follows: 3.3 - Construction of ditch bottom slab; - Installation of formwork of ditch border, pouring concrete as design; - Removal of formwork, completing the ditch as design - Supplementary embankment of ditch structure (if any) - Clearing and removing of waste material Construction bench ditch, ditch at top of slope Construction bench ditch concrete, ditch at top of slope concrete, shall conform to the requirements of section “Concrete and concrete structure” Supplying concrete to construction location, transporting to bench ditch, top ditch by capstan system or hoist Basic construction order as follows: 3.4 - Constructing of ditch bottom slab; - Installation of formwork of ditch border, pouring concrete ditch as design; - Removal of formwork, completing the ditch as design - Supplementary embankment of ditch structure (if any) - Clearing and removing of waste material Construction stepped drop by stone masonry Rip-rap and mortar for stepped drop structures shall conform to the requirements of section “Mortared Stonework” PHUONG THANH TRANCONSIN 13 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Supplying riprap and grouting (mortar) to construction location by capstan system or hoist Preparation for foundation pit of stepped drop accordance with design document Executing mortar stone of stepped drop in process from low to upper All joints of inlets from bench ditches, top ditches, side ditchs, executing carefully the inlet of culvert and comply with Design Drawings Ensuring in good operation III DETAIL CONSTRUCTION METHOD FOR RELOCATION OF EXISTING IRRIGATION CHANNELS Description Channels shall be constructed in accordance with the Drawings for the relocation of Existing Irrigation Channels affected by the Works Such work shall include excavation of channels to the depths and shapes required, including the placing and shaping of excavated materials along the sides as shown on the Drawings The work for channel improvement and/or relocation shall include; the removal of existing dikes, connection with the existing channels, filling and flattening of closed channel sections and any other incidental work to complete the Works Materials requirement 2.1 Materials: The materials for relocation of Existing Irrigation Channels and/or structures, shall conform with the material requirements specified in respective Specification Sections for the Existing Irrigation Channels and/or structures to be improved In the event that the Existing Irrigation Channels and/or structures are of the types that are not covered by this Specification Section the material requirements shall be as stated in the Standards for the materials in ASTM or AASHTO, or as determined by the Engineer 2.2 Submittals: Work Scheduling: A detailed work schedule for each irrigation channel and/or related structures shall be submitted by the Contractor indicating all the construction methods and procedures, including all the necessary measures to control the water and not affect the operation of the existing irrigation and/or waterway systems The Contractor shall not begin the improvement and/or relocation of the irrigation channels and/or the related structures without the Engineer’s approval on the schedules and construction methods proposed by the Contractor PHUONG THANH TRANCONSIN 14 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 The Contractor shall schedule all of the required construction works to ensure the improvement and/or relocation of the irrigation channels and/or the related structures can move smoothly The following shall be considered in the schedule: - Temporary Works shall be in place and operating before beginning embankment Works or as directed by the Engineer - The Contractor shall first shape the Irrigation Channel works to the approved cross sections - The last activity in the schedule shall comprise the final shaping as well as any repairs or damages that may have occurred during construction after completing all other immediately adjacent or interfacing Works Method of Construction 3.1 Preservation of Existing Waterways Existing waterways (which include irrigation channels, drainages, streams and rivers) shall not be disturbed without the permission of the Local People’s Committee and/or Irrigation Company and/or other Companies that are is responsible for their operation and maintenance For waterway realignments, whether temporary or permanent, the Contractor shall maintain the existing channel invert levels as much as possible Realigned waterways shall be located so that their expected flows will not cause detrimental scour or erosion of the Works or nearby properties The Contractor shall be responsible for maintaining the design flows and water levels in all temporarily relocated waterways (which include irrigation channels, drainages, streams and rivers) as far as possible up to the issue of the Taking-Over Certificate The Contractor shall also be responsible for any additional pumping or other related works for maintaining these irrigation and other facilities Where embankment stabilisation or other Permanent Works of the Contract will unavoidably block or partially block any existing waterways these waterways shall be relocated to ensure that unrestricted flows can pass the works at all usual supply and drainage rates and will not affect the existing flood control levels If the Contractor cannot avoid excavating or dredging in any existing waterways for proper execution of the Works he shall backfill all such excavations to the original ground elevations and shapes with materials approved by the Engineer after completing construction The Contractor shall remove materials deposited within the waterway area resulting from foundation excavation, constructing cofferdams or other related works following construction PHUONG THANH TRANCONSIN 15 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Finished grades on realigned (or relocated) irrigation channel inverts shall not vary by more than the dimensional tolerances provided in subsection of this Specification Section The finish shall be sufficiently smooth and uniform to ensure the free flow of water without ponding during periods of low flow The alignment and the shape of cross sections for the realigned (or relocated) Irrigation Channels shall not vary from those specified in the Drawings by more than the dimensional tolerances provided in subsection of Specification Section The Contractor shall notify the Engineer after completing Irrigation Channel excavation No lining works shall begin until the Engineer approves the formations 3.2 Preservation of Water Control Structures The Contractor shall not disturb existing water control structures adjacent to the works of this Contract without the approval of the Local Authorities These structures shall include existing culverts, canal inlets, regulators, gates, pumping stations, etc Water regulation structures for irrigation shall not be disturbed without the permission of the Local Authorities that are responsible for their operation and maintenance 3.3 Concrete Lined Irrigation Channels Relocation of Existing Irrigation Channels, which are concrete lined shall conform with the requirements of this Specification Section and Specification Section “Concrete and Concrete Structures” Such work shall include; excavation of the channels to the depths and shapes required, the deposition and shaping of excavated materials along the sides, bedding, construction of the new channels and their respective connections with the existing irrigation systems 3.4 Earth Lined Irrigation Channels Relocation of the existing channels which are earth lined shall conform with the requirements of this Specification Section, Specification Section “Borrow Material” and Specification Section “Embankment” Such work shall include excavation of the channels to the depths and shapes required, the deposition and shaping of excavated materials along the sides, bedding, construction of the new channels and their respective connections with the existing irrigation systems IV DETAIL CONSTRUCTION METHOD FOR CATCH BASINS, MANHOLES, INLETS, AND OUTLETS Description This Specification Section prescribes the requirements for the construction of Catch Basins, Manholes, Inlets and Outlets to culverts Requirement Materials PHUONG THANH TRANCONSIN 16 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 The Contractor shall submit to the Engineer for his approval details and samples of materials he intends to use for the construction of Catch Basins, Manholes, Inlets and Outlets to culverts and ditches included in the Specification 2.1 Bedding Fine sand fill/bedding shall be black sand complying with the requirements of Table of Vietnamese Standard TCVN 7570-2006 with a fineness modulus of 0.7 to 2.0 Organic and other impurities shall be in accordance with Table of Vietnamese Standard TCVN 7570-2006 as follows: - Clay and balled impurities shall be less than 0.5% - Muds and dirt shall be less than 10% It will not be necessary to determine the alkali reactivity or the chloride content of the sand for this use Sand shall be sampled and tested in accordance with Vietnamese Standard TCVN 7572-2006 (Aggregates for concrete and mortar - Test methods) Granular material for bedding shall be in accordance with Paragraph 4.2, Table of Vietnamese Standard TCVN 7570-2006 and subject to the approval of the Engineer Lean concrete for bedding shall be class C10 conforming with the requirements of Specification Section “Concrete and Concrete Structures” 2.2 Concrete Concrete used for all structural work described in this Specification section shall conform to the requirements specified in section “Concrete and Concrete Structures” 2.3 Reinforcing Steel for Concrete All reinforcing steel used in the works shall conform to the requirements specified in section, “Reinforcing Steel and steel works” 2.4 Mortared stone Mortared stone and mortar used in the works shall conform to the requirements specified in section, “Mortared stone” 2.5 Steelwork Steelwork items shall comply with the requirements of Vietnamese Standard 22TCN288-2002 and shall be galvanised in accordance with AASHTO M232 2.6 Brickwork Brickwork shall conform with the requirements of Specification Section “Brick Masonry” 2.7 Mortar PHUONG THANH TRANCONSIN 17 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 Mortar for joints or other works shall only be used if required by the Engineer, or so indicated on the Drawings If or when required mortar shall conform with the requirements of Specification Section “Cement Mortar” 2.8 Steel Grating Steel grating covers for the Catch Basin for Median as indicated on the Drawings shall comply with the requirements of AS 3679 Grade 250, BS 4360 Grade 43A or ASTM A36 2.9 Porous Backfill or Filter Material In case of requirement in drawings, Porous Backfill or Filter Material shall be in accordance with the provisions of section “Porous drainage and Backfill” or as directed by the Project Managerthe Engineer 2.10 Backfill Filling material used in the works shall conform to the requirements specified in section “Excavation and Backfill for structure” Detail construction method for catch basins, manholes, inlets, and outlets 3.1 Shop Drawings and Schedule 3.1.1 Shop Drawings: The Contractor shall prepare shop drawings and method statements showing his proposed construction details for the Catch Basins, Manholes, Inlets and Outlets to culverts and ditches indicated on the Drawings or as directed by the Engineer Shop drawings and method statements shall be submitted to the Engineer for his approval prior to the start of the any construction works, including the start of any precast works 3.1.2 Work Scheduling: Construction of the Catch Basins, Manholes, Inlets and Outlets to culverts and ditches shall not begin until the Engineer has approved the Contractor’s shop drawings and method statements The Contractor shall allow sufficient time in his program me for the submission and approval of his shop drawings and method statements and for any revision and resubmission of such documents that may be required to incorporate the comments of the Engineer 3.1.3 Site Preparation The Contractor shall carry out any excavation that may be required for Catch Basins, Manholes, Inlets and Outlets in accordance with the requirements of Specification Section Structural Excavation The Contractor shall be responsible for all dewatering and temporary support works for the excavations and all other necessary temporary works that may be required during construction PHUONG THANH TRANCONSIN 18 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 3.2 Delivery, Storage and Handling Materials delivered to Site shall be inspected for damage, unloaded, and stored with minimum handling Any damaged materials shall be rejected and replaced at the Contractor’s expense 3.3 Connections Culvert pipes or ditch sections shall be placed or cast and properly bedded before being cast into or built into Catch Basins, Manholes or Inlet and Outlet structures 3.4 Manhole and Catch Basin Covers, and Frames Covers (R.C or Steel Grating) to manholes and catch basins shall be fabricated, precast or prefabricated, supplied and installed complete with steel frames and lifting points as indicated on the Drawings V CONSTRUCTION OF ROAD SIGNS Scope of work Prior to commencement of the Road Signs, the Contractor shall obtain the approval of the Engineer on the equipment and materials to be used and the methods of work execution No materials shall be used or installed until the Contractor has been notified by the Engineer of his approval Road Signs shall include the provision of foundations and support poles, with all necessary fixings, fittings and accessories all as shown on the Drawings or as directed by the Engineer and as specified herein Materials 2.1 Sign Panels Sign panels for warning, regulatory, and informatory signs shall be flat sheet steel, complying with ASTM B209-07 and having a minimum thickness of 2.5 mm Sheets are to be degreased, etched, neutralized and processed prior to application of reflective sheeting sign panels 2.2 Reflective Sheeting The reflective sheeting used on the road signs shall consist of spherical lens elements embedded within a transparent plastic having a smooth, flat surface with a protected precoat adhesive which shall be pressure sensitive for manual application, or tack free heat activated for mechanical vacuum-heat application The reflective sheeting shall be sufficiently flexible to permit application and adhesion to a moderately embossed surface It shall show no damage when bent 900 over a 50 mm diameter mandrel The sheeting shall be solvent-resistant so as to be capable of withstanding cleaning with petrol, diesel fuel, mineral spirits, turpentine or methanol PHUONG THANH TRANCONSIN 19 GMS Ben Luc - Long Thanh Expressway Project Package A5 Civil Works Km 32+450 to Km 35+900 The sheeting shall show no cracking or reduction in reflectivity after being subjected to the dropping of a 25 mm diameter steel ball from a height of 2m into its surface The adhesive shall permit the reflective sheeting to adhere accurately 48 hours after application at temperatures of up to 90°C The reflective material shall be weather-resistant and, following cleaning in accordance with manufacturer's recommendations, shall show no discoloration, cracking, blistering, peeling or dimensional change Samples of reflective sheeting shall be submitted to the Engineer for approval 2.3 Posts Road sign posts and sign gantries shall be constructed of welded / bolted steel, hot dip galvanized, complying with ASTM A53-07 and having a minimum dimensions as shown on the Drawings All open ends shall be capped to prevent water entry A steel bar of 16mm diameter x 450 mm long shall be welded in the middle horizontally to the foot of the sign posts to prevent the rotation of the post in its foundation The length of the post and the depth of embedment shall be as shown on the Drawings but the post shall be at least 0.80 m in the ground when the sign is at its correct height 2.4 Nuts, Bolts and Fixings Nuts, bolts, washers and other metal fixing parts shall be hot-dip galvanized after fabrication in accordance with the requirements of AASHTO M 111-04 2.5 Concrete Foundations Concrete for foundations for sign posts shall be of class as shown on the Drawings All other requirements for materials and foundations shall conform to the applicable requirements Foundations shall be poured in one pour where practicable Signs shall not be erected on the poles until a minimum of 72 hrs after placing the concrete Construction requirements 3.1 Excavation and Backfilling Holes shall be excavated to the required depth to accommodate the concrete foundation as shown on the Drawings or as directed by the Engineer Backfilling with suitable material approved by the Engineer and compacted in layers not exceeding 150 mm in depth Surplus excavated material shall be disposed of by the Contractor, as directed by the Engineer PHUONG THANH TRANCONSIN 20