One, the project overview:
Zhejiang Xiang Xiangli Shoes Co., Ltd. plant project is located in the industrial zone along the river 23 # plot, Wenzhou City Tongfang Architectural Design and Research Institute design, Lucheng District Quality Supervision Station quality supervision, Lucheng District Safety Supervision Station safety supervision, Lucheng Supervision Company Supervision, Wenzhou City Lucheng Zhenhua Construction and Installation Engineering Co. The total construction area is 894.5 square meters, and the construction period is 180 calendar days. Project quality grade is qualified. Frame structure, the number of floors is five, the total height of the building is 23.60 meters. The foundation pile is designed as mechanical bored piles, the safety grade of building pile foundation is Grade II, the designed pile diameter is φ700, the effective pile length is 32M, the pile enters into the 4th layer of strong weathering not less than 1.0M, the pile type is friction end bearing pile, the thickness of the pile concrete protection layer is 50, and the strength of the pile concrete is C25. the slump is 180~220, the filling coefficient is >1.1, and the thickness of the slag in the bottom of the hole is 2, the construction progress plan:< /p>
1, construction period:
Target of construction period: 15 calendar days for the construction period of this project pile. According to the total progress plan of this project, combined with the construction experience of our company in similar projects in the past, make good preparations for the construction, start immediately and complete all pile construction. For the following reasons for the delay in the construction period, confirmed by the representative of the Party A, the construction period will be postponed accordingly.
(1) Major design changes that affect the progress of the leading construction (but the construction unit is the construction unit of technical measures failure to affect the duration of Party B's own responsibility).
(2) Party A fails to provide design changes on time and it does affect the construction progress.
(3) Force majeure factors.
(4) Other cases in which Party A agrees to give a deferral. Other than that, the contract duration shall not be changed for any reason.
1. Construction progress plan:
According to the actual situation, it is proposed to put in one mechanical drilling and grouting piling machine, and the preliminary plan is to construct 2 piles per day, which can be re-adjusted according to the specific situation after the test piles.
Three, construction program:
1, construction general deployment:
According to the bidding documents, design requirements and the spirit of bidding and answering the questions, this project is a mechanical drilling and grouting piles construction, organizing a technically competent, strong management ability, rich in sense of responsibility of the project leadership team, selecting the good political quality, business ability, mainly by the party, the group members and the advanced production workers. The construction team will invest in the mechanical bored piling machine with excellent piling performance, reliable operation and advanced technology to complete the piling construction task with quality and quantity guaranteed. According to our successful construction experience in similar projects in the past, we focus on the key links of pile quality acceptance, drilling measurement, pile end alignment, drop distance control, pile verticality, pile top elevation control, pile deviation quality, etc., set up a perfect construction quality assurance system, formulate a scientific and reasonable construction plan, and adopt a practicable safety guarantee system, to ensure the successful completion of the project and achieve qualified project quality, and to ensure that the project is completed successfully.
2, construction conditions:
(1) site three through one leveling work is completed by the owner.
(2) Geological survey report of the project provided by the owner.
(3) Control points and leveling points of this project provided by the Municipal Planning Bureau.
3, construction preparation:
(1) The following information shall be available before the commencement of construction:
① Engineering geological survey report of the building site.
② construction area and neighboring areas of the underground pipelines, underground obstacles, the ground investigation of the original building information.
③ signed by the construction unit, supervision unit agreed to start the report.
(2) Preparation for construction:
①Pre-construction site leveling work.
② Do a good job of measuring control points, leveling points and piles of review, sampling work, and reported to the construction unit, supervision units to check and approve the piling axis positioning points and leveling points should be set in the unchanged temporary facilities and mechanical operation of the impact of the place to do a solid and reliable.
3 according to the construction requirements of the construction of temporary facilities, warehouses, construction site offices, dormitories and so on.
4 electricity, water: the construction unit to provide water, electricity supply point connected and electricity distribution box, and then led to the working face, construction water and electricity metered measurement.
5 organization design, machinery and equipment into the field, and layout of the construction site.
6 Check whether the relevant information is complete, and organize the relevant personnel to study and analyze the information, and modify and supplement the information with the consent of the relevant departments when problems are found. Technical and safety briefing to the team explains the importance of the project, quality assurance measures, construction, as well as safety and civilized construction precautions.
⑦Provide the construction organization design and other relevant information before the commencement of construction according to the requirements of the construction party and the supervisory party.
8 the work is basically ready, submit a report on the commencement of construction, reported to the construction unit, the supervision unit for review.
4, construction operation points:
(1) clean up the site - sampling - re-sample - drilling rig in place to drill holes --Lowering reinforcing cage and conduit --Second clearing hole --Flooding concrete.
(2) Pile measurement: according to the pile plan and site coordinates with a latitude and longitude meter to put out the axis and pile position, and nailed, marked with red paint, and timely proofreading.
(3) Construction process selection and equipment: according to the depth of the diameter of the bored pile and the geological structure of the project is proposed to use GPS-15, 10 drilling rigs, and the use of positive cycle technology construction of holes, the construction site using the construction process of commercial concrete piles.
(4) Quality requirements:
①The pile concrete test pile and engineering pile is C25, and the steel is I steel and II steel.
②Pile longitudinal reinforcement joints using single-sided vertical arc welding head, weld length of 10d, upper and lower joints staggered 1m, the same load surface joints shall not be greater than 50%, hoop joints using single-sided arc welding, joint length of 10d, hoop and the main reinforcement with a spot weld, the hoop connection with welding.
③The protective layer of concrete is 50mm.
④The permissible deviation of pile position is not more than: single pile, strip foundation perpendicular to the direction of the axis, the group pile is not more than 20mm, and the single pile is not more than 10mm.
⑤The tilt of pile position is less than 1%.
6 drill holes to reach the design depth for clearing, at this time the mud within 500mm of the bottom of the hole should be less than 1.25 specific gravity, sand content is less than 8%, viscosity is less than 28so, the thickness of slag at the bottom of the hole is not more than 50mm.
7 concrete filling coefficient in >1.1.
(5) Hole making technical measures:
①Sheathing Cylinder Burial: Buried barrel, barrel diameter should be 100mm larger than the diameter of the drill. buried depth should not be less than 1m, the top of the barrel to open 1-2 overflow slurry holes, the center of the barrel and the design of the pile deviation shall not be greater than 50mm.
② Hole: the drill adopts a triple-winged comb type single girdle drill bit, the conventional drilling parameters: P: 2-2.5Kpa, rotational speed N: 20-40r/min, the pump displacement Q
3) The drilling position should be balanced accurately to ensure that no tilting displacement occurs during the drilling process.
④Hole drilling: small parameters are used to open the hole, positive circulation, light pressure and slow rotation drilling to ensure that the drilling tool is guided, after 1-2m through the protective shield, then use the conventional parameters of positive circulation drilling, and according to the changes in the stratum of the amount of adjustment of the parameters and the mud properties, in order to safely and efficiently constant speed into the hole. In the clay soil speed control in 1.5-3.5m/h, sandy soil in 3.5-4.5m/h, in the quicksand, silt texture slower speed, to prevent the rush instead of speed.
⑤ Clearing: after the final hole of the pile hole, raise the drill bit about 100mm from the bottom of the hole, carry out positive cycle clearing, and at the same time replenish the hole with new mud to meet the requirements of clearing, and then use the standard hammer to measure the bottom of the hole to comply with the design and specification standards of slagging, and supervising engineer's visa, clearing of the hole when the specific gravity of the mud is 1.15 or so.
6 reinforcing cage production and lifting and positioning:
A, reinforcing cage production in strict accordance with the design drawings of the relevant specification requirements, reinforcing cage molding using the line and mold frame molding.
B, lifting and placing of reinforcing steel cage to prevent its deformation to keep neat, in the hole butt-lap welding, the upper section should be upright, the lower section should live in the center of the hole, to achieve the center of the upper and lower cages coincide before welding. Reinforcement cage into the hole, to be slow and smooth, the cage should be used to suspend and positioning bar positioning, and fixed in the center of the hole position, in the process of placement, if the road is blocked shall not be forced to go down the cage, should be excluded from the resistance can be down into.
7, concrete filling pile:
A, under the conduit: the conduit should be lowered into the hole according to the number of sections determined by the technician, and make sure that the bottom of the conduit leaves the bottom of the hole within the range of 0.4-0.5M. Conduit joints must be added sealing ring and grease after tightening the wire buckle and joints, to prevent leakage of conduit caused by concrete segregation and plugging accidents, according to the number of the first filling in a timely manner to lift the pipe.
B, underwater penetration: underwater concrete ratio should be determined in advance after testing, slump should be 18-22CM, sand content should be 40-50%, the selection of fine sand, coarse aggregate should be less than the largest particle size of 40MM. water spigot should have a good waterproof performance, it is appropriate to use prefabricated concrete ball plug. Only in the filling of all the preparatory work before ready filling design test run normal, only then can open irrigation. Can not be interrupted after the opening of the irrigation, survey the hole concrete surface elevation, observe the liquid surface in the hole, in order to guide the timely extraction of the pipe, control in the buried pipe 2-3M, shall not be less than 1M, is strictly prohibited to bury the pipe too much or pull out the concrete surface of the conduit, resulting in the buried pipe or broken piles accident. At the same time, according to the actual amount of concrete filling the calculation of the average diameter of the pile, timely and good on-site records, do a good job of concrete specimens of each pile filling time, according to the initial disk of the first concrete solidification time control.
The final pouring volume should ensure that the quality of concrete reaches the design strength value after the pile top is chiseled off the floating slurry height.
Four, project quality, schedule guarantee measures:
1, quality target: drilled pile quality target must be one-time acceptance.
2, guarantee system:
(1) quality control.
(2) Extensive mass QC group activities.
3, guarantee measures:
(1) Strictly according to the project quality management procedures for quality inspection and management.
(2) carry out regular quality education, use all staff to establish the concept of quality first reputation first.
(3) before the construction of technical meetings, the design requirements, construction organization, design and technical measures, quality standards of the relevant norms and regulations to the staff in detail, to achieve the induction of personnel should know and should know.
(4) The implementation of total quality management, quality, management, technical operation standardization, and actively carry out QC group activities. Solve the problems in the construction, improve the construction process, the construction quality of each process to implement a comprehensive, full, full-process management.
(5) the quality of raw materials, a variety of materials must have a quality assurance certificate, the incoming materials must have a person acceptance, and resolutely put an end to unqualified materials into the field.
(6) grasp the quality management of the process, do a good job of hidden works inspection and acceptance and visa, the previous process is not qualified, shall not be transferred to the next process.
(1) The pile hole sample is put into practice double checking and re-testing system, and re-testing must be carried out before the drilling rig is put into position with the shield buried, and the drilling can be started only after confirming the accuracy.
② adhere to the opening and final acceptance system, in the pile after the final hole, according to quality standards on the pile depth, pile diameter, verticality, bottom of the hole deep slag thickness test, assess the quality of the hole, and fulfill the acceptance of the visa.
3) The reinforcing cage must pass the acceptance inspection before entering the hole, and the reinforcing cage will be positioned and elevation controlled by the lifting bar and positioning rod.
④ One of the key processes of underwater concrete, all preparations and contingency measures should be made in time, and the main leaders and project engineers should be present on the spot to guide and supervise and check to ensure the quality of filling.
(7) Accept and comply with the inspection and supervision of the construction unit and supervisory engineer, and rectify the problems in time.
(8) Organize the three combined customs group to grasp the test drilling work of the first test pile, solve the technical problems in drilling into holes and check and formulate the process of pile formation. The drilling head adopts waist hoop shape to ensure the direction of drilling head is vertically downward, and the standard of calculating hole depth is determined according to the type of drilling head and representatives of the supervisor and the Party A to ensure that the depth of the hole reaches the design requirements.
(9) The first clearing of the hole is not less than half an hour, and the second clearing of the hole is immediately filled with underwater concrete within 30 minutes.
4, each process strictly implement the degree of quality acceptance:
(1) Pile placement: self-inspection - construction unit re-inspection - supervision re-inspection signature.
(2) shroud burial: self-inspection - quality inspector self-inspection - supervision re-inspection.
(3) drilling rig in place: captain self-inspection--quality inspector sampling--Supervisor re-inspection and signature.
(4) Mud index: self-inspection of the shift - quality inspector re-inspection - supervision check.
(5) hole in place: self-inspection on the shift - quality inspector re-inspection - supervision signature.
(6) Sedimentation at the bottom of the hole: self-inspection on the shift - quality inspector re-inspection - supervisor's signature.
(7) the second clearing: the shift self-inspection - quality inspector re-inspection - supervision signature.
(8) reinforcing cage: self-inspection on the shift - quality inspector re-inspection - supervision signature.
(9) concrete slump: test block maker test - quality inspector sampling - supervision sampling.
(10) Reinforcing steel cage joints: welding joints production - supervisory supervision and delivery - supervisory inspection.
(11) Specialized production of test blocks, each pile of a group of three, made in the temperature of about 20 degrees Celsius and humid conditions after 24 hours of maintenance and demolding, by the superintendent and the quality inspector **** with the supervision of the standardized 28 days after the test sent to the laboratory.
5, construction and production process stage of the quality assurance system:
(1) before construction, to clarify the quality indicators and engineering inspection methods, the preparation of quality plans and implement them.
(2) during construction, the quality inspector must strictly according to the "technical specification for construction piling" (JGJ94-94) and design drawings, the construction quality inspection, the project technical person in charge of the project must carefully fill out the "construction diary" for quality dynamic analysis of the timely summary of the report to the project manager.
(3) construction machinery must strengthen quality management, the implementation of the four system (fixed people, fixed machines, fixed indicators, fixed maintenance).
(4) incoming materials are stacked in designated locations, the implementation of the four inspection system (variety, specification, quality, construction special program Zhejiang Xiang Xiangli Shoes Co.)
6, the completion of the handover process stage of the quality assurance system:
(1) according to the state-issued completion acceptance standards and engineering quality assessment standards, strict quality control, completion of the handover does not leave a tail.
(2) After delivery, regular quality return activities.
7, the end of the project, the two sides of the technical staff in the supervision of the supervision, the pile deviation, pile top elevation, reinforcing cage top elevation *** with the acceptance, after the symbol requirements, the two sides and the supervision of the acceptance sheet signed to confirm. Acceptance results will form informative documents, all the information was bound into a book, handle the handover procedures, and do a good job after the fact, responsible for the quality of the project to the end.
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