SECURITY AND SAFENESS VRAMP – CONTRACT PACKAGE RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA DRAINAGE AND OTHER WORK ITEMS TABLE OF CONTENTS CHAPTER I CONSTRUCTION METHOD OF DRA[.]
VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA DRAINAGE AND OTHER WORK ITEMS 1/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA TABLE OF CONTENTS CHAPTER I: CONSTRUCTION METHOD OF DRAINAGE SYSTEM I CONSTRUCTION OF U SHAPED DITCH II IMPROVEMENT OF EXISTING DRAINS AND DRAINAGE STRUCTURES III EXISTING WATERWAY PROTECTION CHAPTER II: CONSTRUCTION METHOD OF OTHER WORK ITEMS I CONSTRUCTION OF GUIDE POSTS, GUARD RAIL II ROAD MARKINGS III REMOVAL OF EXISTING STRUCTURES CHAPTER III: WORK COMPLETION, ACCEPTANCE AND HANDOVER I COMPLETION II INSPECTION AND ACCEPTANCE III DEFECT LIABILITY 2/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA CHAPTER I: CONSTRUCTION METHOD OF DRAINAGE SYSTEM All materials must be in conformity with the Specifications I CONSTRUCTION OF U SHAPED DITCHES Preparation This is the drainage ditch for pavement, so that construction will be started when execution of road foundation Construction Setting out roadside ditches: setting out the required location, lengths, diirection of fall, and grades of all roadside ditches, whether lined or unlined Setting out shall include locating all associated catch pits and out falls Ditchs shall be constructed for the relocation of irrigation channels Such work shall include excavation of drainage ditchs to the depth and shape required, along with the deposition and shaping of excavated materials along the edge Underground drainage structures, including earthwork and backfilling incidental thereto, shall be completed before the adjacent roadway surfacing is placed, but pipe endwalls shall not be constructed until adjacent works has been completed, as developments during construction may justify alterations in design or location of such endwalls Also manholes, catch basins and inlets shall not be completed to final grade until after the relevant operations have been finished and all necessary arrangements have been made to ensure suitable connections at proper grade and alignment with pavements, gutter, curbs, etc Removing and disposing of all excavation material to at least 10 meters from the waterway area to prevent any surplus material from falling inti the excavated waterway II IMPROVEMENT OF EXISTING DRAINS AND DRAINAGE STRUCTURES The constructor shall not begin the improvement of drains and drainage structure work without the Engineer’approval on the schedule and construction method proposed by the Contructor 3/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA Extending elevation of existing concrete ditch structures As required to extend the wall height of an existing drainage ditch, the Constructor shall remove necessary concrete, plaster, blocking The Contructor shall extend the height of the drainage ditch walls to the required new elvation using material similar to those employed on the orginal wall Concrete drainage ditch covers All existing concrete drainage ditches to be modified and/or cleaned shall be inspected by the Engineer to determine the acceptability of existing concrete ditch covers and the need for additional and new covers At this time the Engineer shall advise the Contractor what concrete covers shall be reused, the units that shall be replaced and the requirements for new cover sections The Contructor shall provide new sections of precast concrete ditch covers similar in appearance, thickness and dimension to the existing concrete covers New cross drainage piping and catch basins The Contractor shall remove existing concrete cross drainage ditchs and/or catch basins, and replace that with new cross drainage piping and/or new catch basins New cross drainage piping shall be of the size and type indicated on the Drawings, or as directed by the Engineer After removal of existing structures, and prior to the contruction of new structures, the Contractor shall prepare the subgrade by removing all loose materials and thoroughly compacting the subgrade material Backfill materials if required Drainage piping connections to existing concrete drainage chnels shall be accomplished by using exising drainage ditch openings in the drainage chanels as much as practicable The Contractor shall extend existing openings in existing openings in existing drainage dich walls or provide new conection openings as required to provide proper new cross drainpipe placment The Contractor shall fill areas around pipe openings in the drainage chanel walls with mortar Where the removed drainage ditches opening extends to the top of the existing drainage chanel wall, the wall section above the draiage pipe shall be installed Cleaning of existing drainage ditches and drains Removal all debris and obstructions from existing drainage ditches, cross drains and/or catch basins Such work for cleaning shall include the removal of all debris and obstructions from open as well as covered drainage structures to the satisfaction of the Engineer III EXISTING WATERWAY PROTECTION Preservation of existing waterways Disturbing natural streams or chanels as well as irrigation canals and drain adjacent to the works of this Contructor without the approval of the Engineer and 4/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA local authorities Irrigation canals shall not be disturbed without the permission of the local People’Committee or Irrigation Company that is responsible for their operation and maintance If cannot excavating or dredging in an existing waterway for the proper execution of works, shall backfill all such excavation to the original ground elevations and shapes with material approved by the Engineer after completing construction Removing material deposited within the waterway area resulting from foundation excavation, constructing cofferdams, or other related works following construction Preservation of water control structures No disturbing existing water control structures adjacent to the works of this Contract without the approval of the Engineer and 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 People’s Committtee or Irrigation Company that is responsible for their operation and maintenance Realigning existing waterways Where embankment stabilisation or other permanent works of the Contract will unavoidably block, or partially block, any existing waterway, the waterway shall be relocated to ensure unrestricted flow past the works at all usual irrigation supply and flood control levels Waterway realignments, whether temporary or permanent, shall preserve the existing channel invert levels Realigned waterways shall be located so that expected flows will not cause detrimental scour or erosion of the works or nearby property The Contracter shall be responsible for maintaining the design flow and water levels in all temporarily relocated irrigation canals throughout the Contract period The Contractor shall be responsible for any additional pumping or other related works for maintaining these irrigation facilities at his own expense - 5/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA CHAPTER II: CONSTRUCTION METHOD OF OTHER WORK ITEMS I CONSTRUCTION OF GUIDE POSTS, GUARD RAIL Material requirement 1.1 Concrete Concrete must be those specified in the drawings and comply with the requirements of the "Concrete and concrete structures" of the Specifications 1.2 Reinforcing steel Reinforcing steel must comply with the requirements of the "Reinforcing steel" - of the Specifications 1.3 Guard Rail Beams for guard rails shall be Class A with a Type finish in accordance with AASHTO M180 and shall be obtained from a manufacturer approved by the Project Manager Bolts and Nuts: Bolts, nuts, rings and other hardware shall be galvanised in accordance with AASHTO standard M232 (ASTM A153) and all connections shall be able to withstand a side pull in any directions of 2,200 kilograms Paint: Paint shall be applied in the number of applications and of the type indicated in the Contract Documents Paint shall conform to the appropriate specification as follows: Red Lead Ready-Mixed Paint White and Tinted Ready-Mix Oil Base Paint Type Class B Aluminium Paint AASHTO M72 AASHTO M70 AASHTO M69 1.4 Road signs Reflective Beads Beads for reflectorisation of signs shall be of good quality, optically clear, lead-free glass with not less than 90% reasonable spherical and free from flaws The beads shall contain not more than one per cent of sharp angular particles and not more than one half percent of foreign matter and shall be free flowing under normal atmospheric conditions For reflectorising white and yellow, the heads shall have a refractive index of not less than 1.90 For reflectorisation of other colours the refractive index shall be not less than 1.60 and not greater than 1.70 The beads shall contain not less than 80% by weight within one of the size ranges specified below Size Range: Microns 250-177 210-149 177-125 6/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA 149-105 125- 88 105- 74 The binder for the beads shall be formulated so as to provide maximum bead retention, high specular reflection and a firm bond with the surface to which it is applied Base Housings Base housings for metal posts carrying illuminated signs shall be of fabricated steel or aluminium alloy not less than 4.5 mm thick or of cut iron or cast aluminium alloy having an average thickness of not less than mm and a minimum thickness of 6.5 mm Steel shall comply with the requirements of Subclause 6.7.2.1, item (c) Cast iron shall be ASTM Designation A48, Class 30 Fabricated aluminium alloy bases shall be of material complying with the requirements of Sub-clause 6.7.2.1, item (d) Cast aluminium alloy bases shall be either ASTM Designation B26 or B108, Alloy SG 70A, Condition T6 Sign Plates Sign plates and panels shall be manufactured from one of the following materials: Aluminium Alloy Flat sheets and plates shall be one of the following alloys: either Alloy 5052-H34, 6061-T6 or 3003-H18 complying with ASTM Specification B209 Approved alloy sheet or plate complying with such other internationally recognised specification as is acceptable to the Project Manager Extruded panels shall be one of the following alloys: either Alloy 6063-76 complying with ASTM Specification B221 Approved alloy complying with such other internationally recognised specification as is acceptable to the Project Manager Steel Plate, Sheet or Strip - The material shall comply with ASTM Specification A245, Grade B, or such other internationally recognised specification as is acceptable to the Project Manager Frames and Stiffening Except as otherwise provided in the Drawings or these Specifications sign plates requiring frames or stiffening as specified under Sub-clause 6.7.3.5 shall have adequate ribs or flanges as an integral part of the sign plate or shall have frames or stiffening members of material complying with the following A metal frame or stiffening bars constructed of structural sections in steel or aluminium alloy complying with the appropriate specifications of Sub-clauses 6.7.2.1 and 6.7.2.3 Construction method statement Construction by manpower combined with the crane The location for installation of guide posts, signs, must be precisely positioned The installation location of each sign must comply with the regulations of road signs Construction sequence 7/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA The guide post is casted in casting yard at the site, sign system is manufactured and processed in the mechanical workshop Use manpower to excavate the foundation pit of the guide posts and signs to specified depth and dimensions Placing concrete for the foundation of guide posts, guard rail post, signs Curing concrete to the required strength Installing guide posts, guard rail post, signs by self-propelled crane with workers, keep stable during placing concrete and keep straight of columns until completion of posts Inspection and acceptance: after installation of the signs, posts are checked visually Signs must be placed at exact locations, column signs must be straight, not crooked and slant II ROAD MARKINGS Material requirements 1.1 Hot Applied Thermoplastic Materials The laid material shall be one of three types (a), (b) or (c) detailed below as required by the Contract Documents or as directed by the Project Manager, and in accordance with AASHTO, ASTM, BS or other similar internationally recognised Standards (a) Non-reflectorized Thermoplastic - The thermoplastic material shall be factory mixed, from an approved manufacturer and shall be suitable for the type and location of application The material shall possess adequate thermoplastic properties over the range of climatic conditions of the location viz resistance to spreading under traffic at the highest road temperatures and retention of plasticity at the lowest road temperatures and shall give a marking which is effective for at least eighteen months under normal traffic conditions The composition of the material with minimum and maximum proportions and grading of the constituents, the acid value of the binder, the temperature range of mixing and application, the setting time, the softening point (C) and the open flash point (C) shall be stated The material shall be supplied in containers which not contaminate the contents and which protect the contents from contamination and shall be stored in accordance with the manufacturer's instructions (b) Reflectorized Thermoplastic - The material shall be in accordance with (a) above except that ballotini (glass beads) shall be incorporated in the mixture during the manufacture of the thermoplastic material The quantity of ballotini included shall be between 13% and 22% by weight of the total mix The whole of the ballotini shall pass a 1.70 mm sieve and not more than 10% shall pass a 0.425 mm sieve The ballotini shall be free of sharp angular particles and not less than 80% shall be of transparent glass, reasonably spherical and free from flaws (c) Reflectorized Thermoplastic with Ballotini Surface - The material shall be in accordance with (b) above except that a layer of ballotini shall be superimposed in the surface of the hot thermoplastic immediately after laying to give immediate reflectivity The superimposed ballotini shall be of the same quality as that incorporated 8/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA in the reflectorized thermoplastic but may be smaller in size; not more than 20% shall pass a 0.210 mm sieve Ballotini shall be applied at rate of 250-450 grams per square metre such that the combined total of ballotini incorporated in and superimposed on the thermoplastic shall be between 20% and 26% by weight of the material 1.2 Reflectorized Road Marking Paint (a) Description - The paint shall be a cold-applied ready mixed paint suitable for application to cement concrete or asphaltic pavements The paint shall be durable and made reflectorized by superimposing glass beads (ballotini) on the surface of the paint The paint shall also be suitable for applying by brush or mechanical means The following particulars of the paint shall be supplied: (i) composition (analysis by weight) (ii) application (iii) type and maximum amount of reducer (thinner) (iv) drying time (to touch) (v) setting time (to recoat) (vi) recommended coverage (litres per square metre) (vii) heat resistance (max road temperature) (viii) details of any primer, undercoat of tack coat required The paint shall be supplied fresh and ready for use in sealed containers which shall be stored in accordance with the manufacturers instructions (b) Colour - The paint colour shall be the type as detailed on the Drawings or as directed by the Project Manager (i) White - the white paint shall have a directional reflectance of not less than 80 percent when compared with a magnesium oxide sample when tested in accordance with the Federal Test Method Standard No 141, Method 6121 (ii) Yellow - The yellow paint shall have a directional reflectance of not less than 40 percent when compared with a magnesium oxide sample when tested in accordance with the Federal Test Method Standard No 141, Method 6121 The C.I.E chromaticity colour co-ordinates shall be within the limits as specified in Table Limits of Chromaticity Colour Co-ordinates (c) 9/ 14 X Y Test Method No 0.490 0.511 0.514 0.535 0.455 0.433 0.480 0.458 4525 Federal Standard 141 Properties - The paint shall conform to international standards to the satisfaction of the Project Manager PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA Quantitative Requirements Requirements Characteristics Nonvolatile weight) Vehicle (% by Total Dry weight) Solids (% by Consistency, Krebs Unit (K.U.) Min Max Test Method No 38.0 44.0 4051 Federal Std 141 67.0 77.5 4041 Federal Std 141 65.0 85.0 1281 Federal Std 141 1.35 - 4184 Federal Std 141 Federal St 141 1.38 - 4184 Federal Std 141 Unit weight (kg/litre) White Yellow Table 6.8-3 - Drying Time Test Requirements Characteristics Min Max Test Method No No Pick-up (minutes) - 40.0 ASTM D-771 (d) Sampling - Random samples of paint shall be taken as noted below for testing Number of Containers of Material STT 10/ 14 Containers (20 litre capacity) Samples Required Less than 120 121 - 200 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA 201 - 300 301 - 400 401 - 500 More than 500 One sample for every 200 containers Samples of paint supplied in containers larger than 20 litres shall have the same ratio of number to volume as shown above Each sample shall contain a minimum of 10 litres of paint taken as described below (i) Open the container and pour off the surface oil into another dry and clean container (ii) Stir the remaining paint immediately and gradually add the oil to the original container while stirring until the paint and oil are thoroughly mixed (iii) Pour the paint into the empty container and back again into the original container as many times as required until the paint and oil are thoroughly mixed (iv) Pour out a 10 litre sample of paint while stirring into a clean, dry container and cover with a tight-fitting lid The sample container shall then be made air-tight by sealing with paraffin wax or with a tight rubber sheet In the event the paint is supplied in 20 litre containers, one sealed container may be taken as a sample (e) Testing - Testing of all paint samples shall conform to the requirements as detailed in as listed below (i) Federal specification TT-P-85D dated June 26,1969 (ii) Federal Test Method Standard No 141 Paint, Vanish, Lacquer and Related Materials, Method of Inspection, Sampling and Testing (iii) ASTM Specification D-771 1.3 Road Studs All road studs, reflecting and non-reflecting shall comply with the requirements of BS 873 Only road studs which have been approved by the Project Manager shall be incorporated in the Works The Contractor shall submit details of the road studs he proposes to use in the Works to the Project Manager for his approval 1.4 Glass Beads (a) Description - Glass beads (ballotini) in this Specification means the glass beads used for superimposing on the surface of road marking paint as specified in Sub-clause 6.8.2.2 of these Specifications Glass beads shall have a spherical shape and be free of flaws and sharp angular particles These characteristics, when tested in 11/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA accordance with Test Method T1207, Department of Main Roads, N.S.W., Material Testing Manual, shall not be less than 70 percent by weight (b) Properties - Glass beads shall be resistant to chemicals and shall retain their brightness after soaking in the following solutions - Buffered acid solution - N calcium chloride - Distilled water which is free from carbon dioxide gas This water when titrated with 0.1 N hydrochloric acid at the amount of not more than 2.5 millilitres will reach a neutral point - The glass heads when soaked in sodium sulfide shall not turn black All testing regarding the brightness of glass beads shall be in accordance to the requirements of Federal Specification TT-P-85 b Construction requirement 2.1 Preparation of pavement surface The painting on the traffic lanes must include the following tasks: Clean the surface of the pavement To paint, protect and dry out coating To protect pedestrians, vehicles and other traffic types Protect all structures on the road and parts of them from water or mud contaminated paint materials Provide the tools, equipment, labor and paint on the road needed to complete the works Not allow to carry out painting in the rain, wet weather, fog or when the Engineer determines that there are adverse conditions for the works Not conducting paint on the wet road surface or on the road surface has absorbed heat can cause blisters or small paint flakes 2.2 Pavement markings The painting pavement lanes is determined based on designed documents or by indicated by the Engineer Cleaning the road: workers used brooms to clean and dry pavement Required to blow or clean crushed porous rocks, dust, mud, ash from the scope of construction Ensure that spraying paint will meet the technical standards specified in designed documents, approved by the Engineer and the Employer The location of construction, tension, marked lines needed to paint and conduct painting by thermoplastic reflective paint Using specialized painting equipment to paint the pavement markings to the thickness of the designed document Using manpower to apply the coat of solvent on the ground and then heat up the paint in the range of line by painting equipment Protect painted lines in the specified temperature until the paint gets dried and put into use Preparation of Road Surface - The paint shall be applied on a surface which is clean and dry It shall not be laid over loose detritus, mud or similar extraneous matter or over a thermoplastic marking or over an old paint marking which is faulty or incompatible with the paint being applied If a primer or 12/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA undercoat is necessary to ensure proper adhesion of the marking paint to the road surface without bleeding or other discoloration the primer or undercoat shall be fully compatible with the marking paint and the road surface and shall be applied only if, and at the rate of application, approved by the Project Manager Preparation of Paint - All cold-applied paint shall be thoroughly field mixed before applying in order to keep the pigments in uniform suspension Hotapplied paints shall be heated in a properly designed heater, preferably thermostatically controlled, to the correct laying temperature at which it shall be maintained as required for the method of application The paint shall on no account be allowed to exceed the maximum temperature specified by the paint manufacturer The use of thinners or other additives shall not be permitted unless otherwise agreed by the Project Manager Laying - Centre lines, lane lines and edge lines shall be applied by approved mechanical means and shall be laid to a regular alignment Other markings shall be applied by brush, spray, screed, hand-propelled or self propelled machine according to the marking configuration and the type of paint approved for use or as directed by the Project Manager The rate of application of the paint for each coat shall be that recommended by the manufacturer unless otherwise directed by the Project Manager When more than one coat is used the succeeding coat shall not be applied until the previous coat has fully set Road markings of a repetitive nature, other than centre lines, lane lines etc shall, unless otherwise directed by the Project Manager, be set out with stencils which comply with the size and spacing requirements given in the Drawings Glass beads shall be superimposed on the surface of the freshly applied paint immediately after laying to give immediate reflectivity Glass beads shall be applied at a rate of 250 - 450 grams per square metre, unless otherwise directed by the Project Manager Protection of Marking - All markings shall be protected from traffic until they have dried sufficiently to show no pick-up of tyre marks III REMOVAL OF EXISTING STRUCTURES Existing structures upon or adjacent to the proposed road shall be removed by the Contractor, as indicated on the Drawings or as required All material which is not considered of value by the Engineer shall be removed from the right-of-way, or so disposed of upon the right-of-way as not to constitute an obstruction or a nuisance The Contractor shall complete demolition and removal of existing bridges so designated for removal Unless otherwise required by the Engineer, such demolition shall include removal of all bridge substructures down to one (1) meter below the riverbed 13/ 14 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAP/CP9 – MAINTENANCE OF NH6 FROM KM138÷KM158 IN HOA BINH AND SON LA CHAPTER III: WORK COMPLETION, ACCEPTANCE AND HANDOVER I Completion To clean up the site, return to the original condition, complete the places, which has not met the requirement as in the opinion of the Engineer and the Employer for their acceptance and approval After completion of cleaning the site and through comments of the Egineer and the Employer to conduct and invite inspection council for inspection and acceptance of the work then hand over of works to the Employer II Inspection and acceptance In each phase of construction, the contractor will organize technical inspection and acceptance for the next phase of work with all levels of acceptance as follows: Acceptance of internal construction team Participants include officials in charge of construction, the construction supervisors involve in construction work are inspected and accepted The parties will conduct the inspection of construction work promptly, fix errors before organization for inspection and acceptance at higher levels Acceptance of the site Participants included construction manager, the technical staff, who shall inspect the completed work undertaken by the teams Acceptance of Contractor’s internal Contractor's Technical Department will work with construction manager, the technical staff in charge of inspecting completed construction work at the site, remedy the existing defects Acceptance of completed levels Inspection of the completed level shall be conducted only after remedying technical defects and acceptance of previous steps After acceptance by the above levels, the contractor and the Engineer and the Employer supervise construction work and take over completed works The acceptance of these documents are kept on as built document as the basis for the payment settlement for each stage and the whole works Handing over the project After the work was inspected and accepted, all written documents, drawings shall be made and completed by the contractor The handing over of works and put into use, along with complete set of document as above mentioned submitted to the Employer III Defect liability The contractor is committed to guarantee the work item at the request by the bidding documents and Contract agreement between Contractor and the Employer 14/ 14 PHUONG THANH TRANCONSIN