Môc lôc VRAMP – CONTRACT PACKAGE RAI/CP 1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0 38B STRUCTURES / BRIDGES CONSTRUCTION METHOD STATEMENT FOR BORED PILES TABLE OF CONTENTS CHAPTER I MAT[.]
VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B STRUCTURES / BRIDGES 1/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B CONSTRUCTION METHOD STATEMENT FOR BORED PILES TABLE OF CONTENTS CHAPTER I : MATERIALS FOR PILING I CONCRETE II CASING III REBAR WORKS IV BENTONITE CHAPTER II: CONSTRUCTION OF BORED PILES I PREPARATION WORKS II CONSTRUCTION SITE PREPARATION III MIXING OF BENTONITE IV DRILLING HOLE V CLEANING OF BORED HOLE VI INSERTING OF STEEL CAGE AND CONCRETE PLACING VII EXTRACTION OF CASING VIII FINAL PILE TOE LEVEL IX POSITIONAL TOLERANCE X REPORT XI REPORT FOR QUALITY CONTROL OF BORED PILE 2/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Reference standards: - 22 TCN 257 : 2000 Cast acceptance in place - TCXD 88 : 1982 - 22 TCN 266 : 2000 Bridge construction - 22 TCN 272 – 05 - Orther related ASTM and AASHTO pile, Specification for construction Pile, Field Testing Method and Culvert, Technical requirement for Bridge Design Standard CHAPTER I : MATERIALS FOR PILING I CONCRETE General requirement: The materials for production of concrete to ensure the technical requirements defined under Specification section 06100 “ Concrete and concrete structures ” During the storage, transportation, materials must be stored to avoid contamination or mixed grain sizes and types When encountering such cases should immediately remedy to ensure the stability of quality Materal: a Cement The cement shall be Portland cement Type I, complying to all respects with TCVN 4033:1995 or some other cement that approved by Engineer Cement approved by Engineer shall be uses for entire concrete of Project, except otherwise instructions in writing The source of supply of cement shall be subject to the Engineer’s approval and the Contractor shall at all times furnish the manufacture’s test certificates and proof that the specifications have been complied with, together with a note of the date of manufacture, certified by an independent agency in the country of origin Cement shall be delivered to the Site in sealed bags or water-tight barrels bearing the manufacturer’s name, cement type and the date of manufacture The bagged cement shall be stored in piles not more than eight bags high Storage areas shall be perfectly dry waterproof sheds or other such temporary buildings approved by the Engineer The storage capacity shall correspond to the amount of concrete required for the largest units to be cast These buildings shall be used exclusively for the storage of cement and shall be erected with the floors raised well above the ground at places on or near the Site of the Works; and at the completion of the Works the buildings shall remain the property of the 3/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Contractor and shall be dismantled and removed, the foundations broken up and the site restored to its original condition by the Contractor A free passage of at least one meter shall be left between the cement and the side walls of the sheds Each consignment of cement shall be stored apart form earlier consignments and consignments shall be used in the order in which they are delivered The Contractor shall provide weighing machines which shall be kept permanently in each shed for checking the weight of the bags or barrels of cement Cement delivered by bulk carriers shall be stored in silos made for cement storage The cement shall be handled in bulk by use of air-veyors, auger-screw conveyors, enclosed bucket or enclosed belt conveyors All operations for handling of bulk cement shall be by methods that prevent contamination of the cement.The cement storage silos shall be provided with interior moisture control devices that keep the cement dry and prevent premature hydration in the silos.The silos shall be provided with access ladders and entry ways so that samples can be extracted from various levels of each silo for testing purposes b Water for Concrete Mixing and Curing The Contractor’s proposed water source shall be submitted to the Engineer for his approval together with test results confirming that water from the source complies with this specification Water for concrete mixes, curing concrete and other products containing cement shall be clean water free from oil, salt, acid, sugar, vegetable or any other substance injurious to the concrete unless otherwise authorized in by the Engineer The contractor will frequency test of water at the location and time as required by the Engineer c Aggregate Aggregate cement is not contained harmful alkaline reagents in cement with sufficient quantity to cause the excessive expansion of concrete The Contractor must take the tests to proved that aggregate is free from such harmful substances The certificate includes of the equivalent character of concrete in the same condition that is submitted Tests must be conducted in the lab that is met the Specifications The aggregate includes of the particles tough, hard, durable and no other contamination The Contractor is responsible for setting up this aggregate to meet the specification The Contractor shall advise the Engineer of the sources of aggregates to be used to permit samples to be taken in the presence of a representative of the Engineer and the Contractor to test before being brought to the Site 4/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Aggregate is stored into the stack to free drainage and separated and prevent contamination Aggregate is mobilized to site is available and separated to avoid their mixing The aggregate marked types of aggregates present in the heap The Contractor shall gather aggregate at the site in sufficient quantities to ensure that there is no interruption in the process of pouring concrete in any time Contractor will set up the yards for the main material near the mixing station Material shall be inspected and approved by Engineer before commencement of work Both fine and coarse aggreates shall be tested in accordance with the following standarts: TCVN 7572-2:06 Sieve Analysis TCVN 7572:06 Organic Impurities TCVN 141 - 86 Soundness Fine Aggregates + Fine aggregate for Portland cement concrete shall consist of natural sand or other inert materials with similar characteristics, having hard, strong, durable particles Fine aggregate shall be clean and free from extraneous materials, clay balls, organic matter or other detrimental material in accordance with AASHTO M6 The maximum combined quantity of soluble chlorides and sulphates in the fine aggregate shall not exceed 1000 ppm fine aggregate + Fine aggregate shall be reasonably graded and shall meet the grading requirements mentioned in Table + The fine aggregate shall be of such uniformity that the fineness modulus as defined in TCVN 7572-2:2006 shall not vary more than 0.20 either way from the fineness modulus of the representative samples used in the mix designs Table No 1- Grading Requirements of Fine Aggregate Sieve Size Percent Passing by weight (mm) 5/ 19 9.5 100 4.75 95 - 100 2.36 80 - 100 1.18 50 - 85 0.600 25 - 60 0.300 - 30 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Sieve Size Percent Passing by weight (mm) 0.150 - 10 Coarse Aggregates + Coarse aggregate shall be crushed aggregate and shall be homogeneous, clean, and free from extraneous materials, clay lumps, organic matter, and other detrimental materials Coarse aggregate shall meet the requirements of TCVN 7570:2006 + The percentage of wear of the aggregate shall not be greater than 50 as determined by TCVN 7572-12:2006 + The quarry from which the coarse aggregate is to be obtained shall be approved by the Engineer before material is delivered to the Site of the Works + Coarse aggregate shall meet the requirements of TCVN 7570:2006 + The coarse aggregates shall be reasonably graded and shall meet the grading requirements in Table Table No Grading Requirements of Coarse Aggregates Sieve (mm) Size Percent Passing by Weight Concrete Concrete Concrete Class A, B, C and D Class E and F Class G and P 100 100 90 - 100 95 - 100 37.5 25 100 19 90 - 100 12.5 30 - 70 25 - 60 25 - 60 4,67 - 10 - 10 - 10 d Admixtures To avoid cold joints the Contractor shall provide sufficiently large capacity in his concrete producing plant and concrete transporting arrangements and use an appropriate retarder when deemed necessary by the Engineer The retarder shall be of a type approved by the Engineer and shall comply with the requirements of TCXDVN 325:2004 6/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Retarders shall not be used together with other admixtures in the same mix unless approved by the Engineer Preliminary tests of cylinder strength and any other tests shall be carried out for all concrete with admixtures When the Engineer approves changing the brand or type of cement, the Contractor will be required to carry out further tests and establish a relative mix design Water reducing and water reducing-retarding admixtures, in accordance with TCXDVN 325:2004 and plasticizing and plasticizing and retarding admixtures in accordance with 22 tcn 202-1998 may be used with written permission of the Engineer in accordance with mix designs and slump requirements as approved by the Engineer Calcium chloride or admixtures containing calcium chloride will not be permitted II CASING Temporary casings Temporary casing was made in workshops with 10mm thickness The length of casing shall be based on the borehole geology and construction methods drawings of bored piles Temporary casing is used for bored piles of Trang Thua bridge, Cong Neo bridge The length of steel casing is in accordance with 22TCN257-2000 Permanent Casings Permanent casings shall be used where specified on the Drawings or as instructed by the Project Manager and shall conform to in accordance with 22 TCN 257 -2000 or ASTM A36 or equivalent The minimum thickness of the permanent steel casing shall be as shown on the drawings The steel casing shall be furnished in appropriate lengths The casing shall be handled and stored in a manner that shall prevent buckling and other deformation as well as accumulation of dirt, oil and paint When placed in the work it shall be free from dirt, oil, grease, paint, mill scale and loose or thick rust III REBAR WORKS All reinforcement steel shall comply with the requirements of Specification Section 06400“Reinforcing steel” Reference standards: 7/ 19 - TCVN 1651 : 2008 - Reinforced concrete - TCVN 570 : 93 Hot rolled steel for armouring reinforced concrete constructions PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B - TCVN 6284-1 : 1997 Pre-stressing Steel - ASTM - A615 Deformed and Plain Billet-Steel Bars for Concrete Reinforcement General requirements Rebar used in reinforced concrete structures must be ensured the design requirements Rebar is fabricated at site but to ensure appropriate level of mechanical quantities corresponding to the processing of steel Do not use the same steel works the same shape, size geometry, but different physical properties - Rebar before fabrication and placing must ensure that: The surface is clean, no sticky dirt, grease, no rust flakes and layers of iron The steel bars were crushed, reduced cross section due to cleaning or other reasons shall not exceed the permitted limit of 2% in diameter If this limit is exceeded such steel are used in actual sectional area remaining Rebar must be bending, pulling and straightening Cut and bend rebar The processing of Rebar is in compliance with project standards Cut and bend rebar shall be conducted only by mechanical methods Bar reinforcement shall be cut and bent to the shapes shown on the Drawings Fabrication tolerance shall be in accordance with ACI 315 All bars shall be bent cold, unless otherwise permitted Bars partially embedded in concrete shall not be fied bent except as shown on the Drawings or specifically permitted Production of steel cage Rebar is fabricated in right size and dimensions as shown in the drawings and are installed properly and the center hole in the approval of the Engineer It must pay a special attention to the implementation of the "The positioning bar of steel cage" have outstanding tolerance not exceeding 10 mm in all directions, will not be allowed to pour concrete until approved by Engineer All pads or the distance must be anchored with rebar certainly to ensure firmly with steel cage Make sure the length and height of welding as required Steel piles are processed into individual cages with a total length in connection equal to the length resuming steel cage design IV BENTONITE 8/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Bentonite, immediately prior to mixing, shall be in accordance with specification DFCP4 of the Oil Companies Materials Association (Drilling fluid materials – bentonite), or the American Petroleum institute Standard 13A 9/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Chapter II: CONSTRUCTION OF BORED PILES I Preparation works Construction equipment includes : Drilling equipment: is a self-propelled crane for craning casing, equipment and erecting the drilling machine Drilling equipment includes of grab buckets as mechanical or hydraulic dredging buckets Mixing equipment, tanks and bentonite pumps Vibrating hammer with hydraulic power 170KW is enough capacity for lowing the casing into the hard ground Cleaning equipment: betonite pumps, compressors 10m3/minutes Other construction equipment such as tremie pipes, concrete vehicles, mix truct, welding equipment, etc List of equipment Item of work Trademark Description / Bored pile driller Barge 200T Drilling equipment with Kelly crane From Drilling depth 80m, diameter Max 2.0m 170 KW 04 Japan 04 Germa ny Japan 03 04 Bentonite Pump 04 Tank for betonite 04 Pipe tremie 04 Test set of betonite 04 Americ a Air Compressor 04 Testing set of concrete 04 Americ a Viet Nam 10/ 19 Rema rk 04 03 Mixer of bentonite Vibrator hammer Sand separation system for betonite fuid Numb er Japan PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Item of work Trademark Description / Numb er Mixing plant IMI-60 60m3/h 02 6m3/xe 08 Viet Nam Japan 02 Japan Truck for concrete Main and standby generator Concete pump 60m3/h From 02 Concrete pipe 600m Set of pipe for cleaning bored hole 03 Total Station Nikon DTM 352 02 Japan Surveyor’s Level Horizon Model 3032 02 Japan 03 China Cutting and bending machine Rema rk Dmax =32mm II Construction site preparation For the abutment, pier on land: remove organic soil and leveling to create construction site For the pier next to river side: Driving sheet pile system at surfaces, leveling to create construction site For the pier under water ( Pier P3,P4 of Trang Thua Birdge and Cong Neo): Construction of the pile drilling system on river includes : Guide frame system, Barge, Waterway traffic safety system The main purpose of preparing site plan is creating space for the installation and operation of drilling equipment and construction of bored piles Positioning the pile centre by Total Sation and marker is made by wooden piles to avoid the lost during construction process, Drawing a circle with diameter the same with casing on the ground and take this ring to locate the casing when lowering Pile center under water shall be located based on the casing and positioning frame Mobilization of material, equipment for bored pile (installation of drilling equipment, crane, casing, positioning pile, air compressor, manufacture of rebar for pile) Checking the operation of equipment, concrete supply, water and power 11/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B III Mixing of bentonite Bentonite is mixed with cleaned water to create the slurry, maintain the stability of the drilling work in the concrete placing and completion of execution The temperature of the water used for mixing Bentonite is not less than degrees C Bentonite grout is mixed and operation in a specialized equipment in a closed process includes all stages of mixing, filtering, pumping to drilling holes and gather mortar for reusing Bentonite is strictly in accordance with the technical standards by Contractor Benonite mixing ratio dry / water is adjusted according to actual geological drilling Contractor shall conduct the tests in accordance with bentonite specification before commencement of work The contractor will propose test methods, sampling procedures, inspection frequency and bentonite grout and submit to the Engineer Betonite's certificate Contractor’s site lab is sufficiently equipped with equipment to examine the density, viscosity, pH, shear force of the bentonite mixture to deploy test in the construction process The tests and inspections must be taken regularly for bentonite The properties will be IV measured Results amplitude at 20o C Testing method Concentration Under 1.10g/ml Weight ratio Viscosity 30-90s Funnel viscosity measurement fann visconsity meter Or under 20 cP Cutting intensity ( intensity around 10 minutes ) 1.4-10 N/m2 Cutter or 4-40 N/m2 Fann viscosity meter PH 9.5 - 12 PH or pH power indicator Drilling hole a Driving casing The Contractor uses the temporary steel casing to guide and stabilize the hole wall Using the crane 35 tons in combination with vibration hammer 170 KW and excavation to lower the casing b Drilling hole - Use rotary drilling machine to drill bored piles - Bored piles will be drilled in sequence so that next bored pile will not be next to the piles having fresh concrete 12/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B - The bentonite in the bored hole must be maintained so that the pressure of the fluid always exceeds the external pressure of the soil and outside water Bentonite will be maintained at a height meter higher than the outside groundwater level - Excavated Soil, unsuitable Bentonite will be taken out of the Site to follow the provisions of Specifications V Cleaning of bored hole The Cleaning method for bored hole shall be applied by Contractor as follows: Dredging bucket is used for dredging large size of mud from bottom hole Treatment for the sediment by circulation method : Using a pump with high capacity to pump clean bentonite to the bottom hole, clean and light bentonite shall be floated and pull drillcuttings out of the bored hole Dirty bentonite is led through the sediment tank, sand separator machine, the container and returning to the hole Using the method of reverse circulation for cleaning hole may be of ways: Use air compressor: Erecting the tremie pipes into the drilled hole with a distance between head of tremie and bottom of the bored hole about 1m Inserting the air leading pipe into the tremie pipe End of air leading pipe is fitted with air nozzle and counterweight to keep the pipe from being pushed up during operation End of air pipe is laid 10m distance from the bottom of tremie pipe Pumping the compressed air into leading pipe to push drillcuttings and bentonite from the bottom of the hole up and pouring the clean bentonite into the bored hole Use water pumps with high capacity, type of full pumping to place into bottom of drilled hole to push the mud up from the bottom hole and pouring the clean bentonite into the hole Cleaning of holes are carried out by stages, first stage conducted after the completion of drilling and second stage is carried out after lowering steel cage (if any sediment beyond the requirements of technical regulations) VI Inserting of steel cage and concrete placing Along with methods of bored piles, the Contractor shall submit to the Engineer for his approval the construction drawings and details related to the installation of the steel cage and the corresponding sequences, and equipment and measurement tools to prevent and the broken of bored hole and maintain the stability of bored hole during the erection of the steel cage and control procedures in the method of vertical and firmly in the process After completion of the drilling and installation of steel cages and cleaning the hole, the Contractor will require Engineer’s approval for conducting the placing of concrete 13/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B The bottom of bored hole must be checked before commencement of work to ensure that there is no accumulation of silt or other materials mixed Soon after being approved by Engineer the concrete placing must be taken and without interruption The concrete shall be a rich coherent mix of high workability having a maximum measured slump of 200 mm The concrete shall be placed in such a manner that segregation does not occur The concrete placing must be done in accordance with the technology of concreting under water : + Using the vertical pipe to push concrete down (tremie pipe ) + Concrete placing pipe having a diameter of 250mm or more, are connected into the 1m, 2m, 4m, 6m, the short pipe is connected to each other, at the junctions must be watertight (using high rubber washer) and pipe are manufactured exclusively used for the placing of concrete under water concrete pipe must be of sufficient thickness to prevent the distort of pipe with the pipe of 70m depth + Tremie joints of pipe is easy removable The pipe lifting is done by crane + Funnel for concrete : * Volume of funnel must be calculated to contain sufficiently the concrete volume to ensure the submerged concrete of pipe legs * The slant of funnel must be calculated to ensure the concrete pouring into the casing with slant of 1:1 to 1:2 + Barrie for water must be made in soft material, easily deformed such as rubber, spongy, waterproof with density less than to its own emergence from the water when out of the tremie Barrie for water is always closely the pipe circumference, but not be stuck in any case The upper side of barrier is always in contact with concrete Using the crushed spongy D=2cm, pouring into bag with thickness of 50cm and inserting into concrete pipe + Productivity of placing is 25-40 m3 / h + Placing concrete under water: * Concrete continuously supply concrete pump (pump capacity of 60m3 / h) this is method to ensure that no water get into the concrete pipe Concrete is a mixture with high liquid suitable slump of 125 mm - 175mm Concrete must be ensure that no segregation Funnel and tremie pipe must be cleaned and waterproof Tremie is always submerged in poured concrete least m and not greater than 5m 14/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B Measure the concrete surface elevation must be conducted immediately before and after any movement of the tremie pipe Samples of bentonite slurry should be taken from the bottom of the hole using sampling devices have been approved If density more than 1.25 then it is not allowed to carry out the placing of concrete In this case, the Contractor shall replaced the bentonite if approved to meet the requirements of the Technical Instructions VII Extraction of Casing a) Workability of Concrete Temporary casings shall be extracted while the concrete within them remains sufficiently workable to ensure that the concrete is not lifted Should a semidry mix have been approved the means of ensuring that the semi-dry concrete does not lift during extraction of the casing shall be subject to approval b) Concrete level When the casing is being extracted a sufficient quantity of concrete shall be maintained within it to ensure that pressure from external water or soil is exceeded and that the pile is neither reduced in section nor contaminated No concrete is to be placed in the boring once the bottom of the casing has been lifted above the top of the concrete; concrete shall be placed continuously as the casing is extracted until the desired head of concrete is obtained The pile shall be concerted with an overheight agreed by the Project Manager to allow for chiseling back to the required cutoff level and to ensure sound, uncontaminated concrete in the head of the pile Adequate precautions shall be taken in all cases where excess hydraulic heads could be caused as the casing is withdrawn because of the displacement of water by the concrete as it flows into its final position against the walls of the shaft The use of vibrating casing extractors shall be subject to the approval of the Project Manager c) Water Level In the event of the groundwater level being higher than the required pile head casting level shown on the Drawings, the Contractor shall submit his proposals for approval prior to placing concrete The pile head shall not be left below the groundwater level unless approved precautions are taken VIII Final Pile Toe Level a) Prior to the commencement of pile boring at each pile cap or structure, proposed founding levels shall be established form site investigation boreholes (prebores) located at or near pile positions Boreholes shall be in accordance with requirements and procedures of Specification section “Soil Investigation Borings” and/or as required by the Project Manager The Project Manager will require prebore results a minimum of one month in advance of the piling works to confirm the design of the piles b) The Project Manager shall determine the final pile toe level after his inspection of the earth layers penetrated by the pile 15/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B c) During the boring of the pile, the Contractor shall produce a “boring log” indicating depths and types of the various earth layers Disturbed samples shall be submitted to the Project Manager as requested d) If during the installation of the piles the ground conditions are different form those observed in the prebore, the Contractor shall at once notify the Project Manager IX Positional Tolerance The center of the completed pile at the cut off level shall not deviate more than 80-mm form the theoretically correct position shown on the drawings The inclination of the pile shall not deviate more than 1:100 form vertical X Report - Contractor shall provide to Engineer the detailed daily records on the geological condition encountered during construction XI Report for quality control of bored pile - Bored Piles will be tested to evaluate the bearing capacity based on test results of Core Testing, Sonic Coring and Impulse Testing PDA and SPT test a Ultrasonic test - Check the integrity, consistency of concrete piles by means of ultrasonic test with all piles - Test shall not be carried out until the pile concrete has gained its 28 days characteristic strength - Sonic Coring and Impulse Testing shall be carried out by approved specialist firms, from whom a full method statement shall be obtained and approved by the Project Manager prior to commencement of testing - The interpretation of the results shall be carried out by competent persons and an indication of the result of all testing shall be passed to the Project Manager immediately on completion of all tests A full written report shall be provided directly to the Project Manager within 10 days of the test being carried out - If the ultrasonic testing indicated defects in the concrete, the contractor can perform the drill sampling and laboratory test to demonstrate that the quality and strengthen of concrete is met the requirements - The Engineer shall give his instructions for taking the sample and testing b PDA Tests - Check the vertical load capacity of single pile by the methods of Impulse Testing: the number of piles in need of test must be met the specification and Engineer’s instruction - The order of testing and reporting test results is in compliance with regulation of technical instructions 16/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B - Outline of test for evaluating the load capacity and quality of bored piles must be approved by Engineer c Core testing - Core drilling shall be provided for completed piles from end of the 100-mm tube to at least 600 mm below the bottom of the pile The cores obtained shall be placed in core boxes and the drill hole identification shall be clearly marked on the cores and boxes - Upon the satisfactory completion of tests, all voids formed by core drills shall be pressure grouted with non-shrink grout in accordance with the Specifications d Other tests - In addition to the above tests, the Contractor that will the SPT tests and other tests as specified in the Specifications e Tubing for Sonic Coring - For the purpose of testing pile integrity by Sonic Coring, and core drilling, all Cast-in-Place Concrete piles shall be placed with 100 mm and 50 mm, schedule 80, CPVC plastic pipe tubing in accordance with ASTM D-2846 - The length of the 100 mm tube shall extend from 500 mm above the bottom of the pile to at least 30 mm above the top of the pile temporary casing - The length of the 50 mm tube shall extend from the bottom of the pile reinforcement to at least 30 mm above the top of the pile temporary casing - The bottom of the tubing shall be permanently sealed - The top of the tubing shall be provided with a screw type plug, to prevent the intrusion of foreign materials into the tubing - Tubing shall be placed continuously straight from the bottom to the top so as to allow later introduction of Sonic Coring and core drilling apparatus - During placement the tubing shall be kept free of all foreign materials - The Contractor shall be responsible for any corrective work necessary if testing and/or coring can not be accomplished because of improper placement and/or the presence of obstructions in the tubing - When required by the Project Manager, the Contractor shall fill all tubes with an expansive grout, acceptable to the Project Manager, which is capable of displacing any water in the tubing The grout shall be continuously injected into the tubing from the bottom of the tube to the top f Tube Placement for Sonic Testing Tubing in each pile shall be installed as follows: - Pile diameter 1000 mm or less 17/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B - One (1) 100-mm tube and two (2) 50-mm tubes shall be installed - Tubing shall be placed equal distance (or as otherwise may be required by the Project Manager) around the outer perimeter of the pile - Pile diameter greater than 1000 mm and less than or equal to 1300 mm: - One (1) 100-mm tube and three (3) 50-mm tubes shall be installed - Tubing shall be placed equal distance (or as otherwise may be required by the Project Manager) around the outer perimeter of the pile - Pile diameter greater than 1300 mm - One (1) 100-mm tube and five (5) 50-mm tubes shall be installed - Tubing shall be placed equal distance (or as otherwise may be required by the Project Manager) around the outer perimeter of the pile g Pilling Records - The Contractor shall deep records of the installation of each pile and shall submit two signed copies of these records to the Project Manager as required The signed records shall form a record of the work in accordance with the following: - Records of pile Borings: Date Contract Pile reference number (location) Pile Type Nominal cross-sectional dimensions or diameter Nominal diameter of underream Length of preformed pile Standing groundwater level Date and time of boring Date of concreting Ground level at commencement Working level Depth from working level to pile toe Toe level Depth form working level to pile head level Length of temporary casing Length of permanent casing Vertically of borehole Set of pile or pile tube in mm per 10 belows or number of blows per 25 18/ 19 PHUONG THANH TRANCONSIN VRAMP – CONTRACT PACKAGE:RAI/CP-1 – TRANG THUA AND CONG NEO BRIDGE ON NATIONAL HIGHWAY N0.38B mm of penetration Soil samples taken and in-place tests carried out Length and details of reinforcement Concrete mix Volume of concrete supplied to pile where this can be measured in practice and corresponding levels of concrete and casing All information regarding obstructions delays and other interruptions to the sequence of work Strength of corresponding concrete cylinders If grouting done, mix and quantity of grout used 19/ 19 PHUONG THANH TRANCONSIN