Chongqing xxxxx Construction Supervision and Consulting Co., Ltd. was commissioned by Chongqing xxxxx Real Estate Development Co., Ltd. to carry out the construction phase supervision of the unit project of Chongqing ××××. The project started on May 8, 2007, and on December 30, 2008, the project was pre-accepted. The supervision unit has completed the work agreed in the commissioned supervision contract, and now the construction supervision of the project is summarized as follows:
I. Project Overview
Chongqing ×××× commercial and residential building is located in the ×××× land of Chongqing xxx new area. This project is a high-rise civil residential building, seismic intensity of 6 degrees, fire prevention level for the first level, roof waterproofing second level, the design service life of 50 years. The total construction area of this project is 45000m2, the total height of the house/93.00 m, -3/28 floors, the maximum span is 7.8m.
The foundation project adopts hand-dug piles, independent column base, strip foundation trench, the foundation is placed on the medium weathered mudstone, the natural compressive strength of the designed mudstone is 9.12MPa.
The main structure is frame shear wall structure, the main structure The concrete strength is C30-C45, and the internal and external infill walls are aerated concrete block, shale hollow brick masonry, mixed mortar masonry (strength grade M5.0), structural columns, prefabricated small parts (over-beam) concrete C20.
Roofing is flat, SBS modified bitumen membrane waterproofing layer 3mm, polystyrene board heat preservation layer 30mm, and 40-thick waterproofing layer of fine stone concrete C25.
Household for the initial decoration, cement guameishi leveling layer, wall mortar plastering layer, no cover layer, canopy scraping waterproof putty, stairwell floor, tread with wear-resistant floor tiles, elevator cabins for glass floor tiles, elevator door paste wall tiles, ladder iron railing handrail, the rest of the wall white latex paint cover; balcony railing with laminated glass and stainless steel railing, entry door for anti-theft security doors, exterior windows and balcony doors are 5+9%, and the door is a 5+9%. The entrance door is anti-burglary security door, exterior wall window and balcony door are 5+9A+5 hollow glass plastic steel window. The external wall windows and doors are 5+9A+5 hollow glass plastic steel windows, and the entrance door is steel door.
Drainage engineering: the indoor drainage pipe and rainwater pipe are installed with PVC pipes.
Energy-saving project: polystyrene granule heat preservation outer wall, polystyrene board heat preservation and thermal insulation roof, plastic steel windows with double-layer hollow glass heat preservation and insulation layer.
Water supply and electrical installation and elevator installation are implemented according to the contract.
II. Participating units
Construction unit: Chongqing ×× Real Estate Development Co.Ltd.
Supervision unit: Chongqing ××× Construction Supervision Consulting Co.Ltd.
Design unit: Chongqing ×××× Engineering Design Co.Ltd.
Survey unit: ××× Geological Survey Institute
Contracting unit: Chongqing ×××× Engineering Design Co. >
Contractor: Chongqing ×× Construction Engineering Company
III. Quality supervision unit:
Chongqing ×× District Quality Supervision Station
IV. Supervision organization and supervision system
Chongqing ×× Construction Supervision and Consultation Co. ××Ltd. is entrusted by Chongqing × × Real Estate Development Co., Ltd. in accordance with relevant laws and regulations and the agreement of the entrusted supervision contract, according to the construction contract, design drawings and related design documents, the requirements of the relevant technical specifications, the quality of construction of the project, the progress of the implementation of supervision.
1. Supervision organization: Comrade × × × × × Construction Supervision and Consulting Co., Ltd. appointed by Chongqing × × × × × as the superintendent engineer, × × × × ×, × × × × × × × as the site supervision engineers, composed of Chongqing ×××× Project Supervision Department.
2. Supervision system: in accordance with the "Construction Engineering Supervision Specification" (GB 50319-2000) and the requirements of the relevant documents, in this project to establish a design submission and construction plan review system, engineering quality acceptance reporting system, construction organization design (program) reporting system, opening (resumption of) work reporting system, incoming raw materials, finished products and semi-finished products, Components inspection and witness sampling and inspection system, hidden works acceptance system, engineering quality inspection system, engineering stage acceptance and completion acceptance system, guarantee information verification system, site meeting system.
V. Supervision work
(a) construction preparation stage
Supervisors in the construction preparation stage all into the construction site, the project supervision work on the planning and preparation; construction contractors before the start of the construction of the construction of the quality of the preparatory work for the inspection, mainly carried out the following work.
1, reviewed the construction unit and engineering project manager, project technical leader and the qualifications of the main management personnel;
2, checked the construction unit quality, safety assurance system and quality, safety management system establishment, site management system and responsibility system establishment and implementation;
3, reviewed the construction unit submitted construction organization Design and related safety production construction program;
4, checked the construction unit construction technology, construction machinery, equipment, materials, temporary facilities preparation;
5, participated in the design and technical delivery meeting, and put forward constructive comments and suggestions;
6, the preparation of the construction supervision plan and key sub-parts of the project supervision rules;
< p> 7, the organization of the supervision staff carefully familiar with the drawings, to find out the focus of construction quality control and difficulties, and develop countermeasures;8, the establishment of the construction site meeting system, and the organization of the first regular meeting of the construction site, the supervision of the work of the briefing.
(B) construction stage
1, verification of the construction site quality management system, the implementation of the construction quality inspection system and on-site construction technology management personnel in place; check the construction unit prepared by the construction design, safety and civilization construction program, scaffolding erection and dismantling program and construction technology delivery.
2, urge the construction unit to enter the construction site of raw materials, semi-finished products, finished products, such as on-site acceptance, which: important raw materials into the acceptance record 6; steel factory quality certificate 147, sampling and re-inspection report 147; cement factory certificate of conformity 7, 7 re-inspection report into the field; sand sampling and inspection report 10;, crushed stone sampling and inspection report 9: shale bricks sent sample 1 group: 2 groups of hollow bricks, aerated concrete blocks 2 groups: 2 groups of ceramic tiles have factory certification: factory certificate of conformity 5; compressive strength test report 5;, are to meet the design requirements and relevant quality standards to ensure that the materials used in the project are qualified products.
3, may affect the structural safety and the use of functional key processes or parts of the set up quality control points, such as: foundation positioning line, piling inspection and acceptance, hidden acceptance of reinforcing steel works, templates and support for the production and installation of concrete, acceptance and pouring of the concrete, roofing, waterproofing construction of toilets, renovation projects, sample wall, sample room construction, etc., in the construction of the side station taken, Inspection, parallel inspection and witness sampling and other means of supervision in the construction. Fill in the construction of 63 records of supervision, rectification notice 15.
4, the hidden works and key processes item by item verification acceptance signing. Such as the hidden acceptance of the base trench pit, hidden acceptance of the pile foundation works, hidden acceptance of the floor reinforcement works, hidden acceptance of the masonry reinforcement, and so on.
5, the concrete, masonry mortar and steel joints in accordance with the provisions of the strict implementation of the witness sampling system,
The concrete, masonry mortar and steel joints in accordance with the provisions of the strict implementation of the witness sampling system, according to the sampling program to witness the sampling system, and unqualified specimens were processed in a timely manner. Construction of concrete cubic compressive strength specimens extracted from the standard maintenance 1 # building 153 groups, 2 # building 128 groups of the same condition maintenance 1 # building 59 groups; 2 # building 51 groups: extract mortar cubic compressive strength specimens 1 # building 2 # building 31 groups; steel joints performance test 1 # 2 # building **** 324 groups.
6, in violation of the construction project specifications, standards and safety regulations of the quality of behavior in a timely manner; on the construction process of quality defects, supervisors for the emergence of problems in a timely manner to supervise and help the construction unit to carry out corrective action, treatment, will affect the quality of the project to eliminate the problem of the construction process.
7, the construction process, supervision staff timely supervision, guidance to the construction unit to make good construction technical data (construction records, self-inspection records, hidden inspection records and a variety of engineering data) preparation, collection and organization, to ensure that the engineering data and engineering progress synchronization; at the same time, the formation of the technical data for the verification of the signing, to ensure that the authenticity of engineering data, accuracy and completeness, *** signing of engineering data, *** signing of engineering data, *** signing of engineering data, *** signing of engineering data, *** signing of engineering data, *** signing of engineering data. Completeness, *** signing the project inspection application form 286.
8, involving structural safety and the use of function of the important branch of the sampling test (inspection) witnessed the monitoring, such as: drainage pipe flooding test, roof and bathroom water storage test, lightning grounding resistance test, exterior wall finishing brick bonding strength test, verticality of the building, elevation observation, etc., the implementation of the bystander monitoring, and checking the relevant testing information and objects.
9, the organization held a monthly meeting of the construction site, supervision of the work of the meeting, for the site construction technology, engineering quality, construction safety and other issues according to the progress of the project in a timely manner matters needing attention and problems, and put forward the relevant requirements.
(C) quality acceptance of work
Engineering supervision of the whole process of construction quality supervision, construction quality acceptance of the following work:
1, urge the construction unit in the acceptance of the quality of the project before a good self-inspection, mutual inspection work, in their own inspection and evaluation on the basis of qualified, and then put forward an application for inspection, supervision engineers to check the qualified party to sign the application for inspection of the construction party. The construction side of the inspection application for signing.
2, to participate in the acceptance of the test batch and sub-projects, on-site supervision engineers to sign the acceptance of the project.
3, to participate in the acceptance of the division of the project, the foundation division of the project, the main division of the project to make a project quality assessment report, the superintendent or the superintendent of the superintendent on behalf of the acceptance of the division of the project for signing.
4, in the acceptance process, the unqualified projects or quality defects in a timely manner issued a rectification notice, and urge the construction unit to rectify in a timely manner, rectification is completed after self-checking, the supervisory engineer of the rectification project to re-acceptance, acceptance of the rectification of the receipt after signing.
5, the construction unit of the completion of the application for examination and approval, and issued a unit project quality assessment report.
6, to participate in the construction unit organized by the acceptance of the completion of the project, and prepared a summary of construction supervision.
Six, engineering construction quality acceptance
1, foundation engineering quality
The foundation project for the use of three types of foundation: manually dug hole piles, independent column foundation and bar foundation.
The main raw material of foundation reaches the qualified standard after acceptance; the pile end bearing capacity, pile embedded depth and pile geometry meet the design requirements; the axial deviation of piles, pile top elevation, verticality deviation of piles are all in the specification allowable error; the structural concrete specimens have reached the qualified standard after inspection and evaluation.
The foundation piles are tested by low-strain reflected wave method, *** test 50 piles, pile concrete integrity, testing qualified;
This foundation division is divided into earth, template, steel, concrete, cast-in-place structure and other 5 sub-projects, sub-projects, test batch quality acceptance records 71, the quality of the sub-projects and test batch by the qualified standard.
This division of the project in the contracting unit on the basis of self-checked, by all parties involved in the verification and acceptance.
2, the quality of the main structure
The main structure of the project is a frame shear wall structure, the main raw materials are accepted to meet the standard.
According to the construction process, columns, beams, slabs and brick masonry, etc. on the physical in accordance with the provisions of the witness sampling, concrete specimens, reinforcing bar welding head, mortar specimens, are in line with the design and acceptance specifications.
Heng Yi experimental testing center for the main structure of the concrete strength in-situ testing, *** testing floor concrete components 13 (concrete
strength C30-C45), in line with the design requirements; hoops spacing test, the error value are within the acceptance specification allowable range;
The main body division **** divided into cast-in-place structure, infill wall (aerated concrete blocks.), Sintered shale hollow brick) masonry, reinforcing steel, templates, concrete 6 sub-projects, *** signing inspection lot acceptance record 878 (of which 1 # building 432, 2 # building 446) copies of the sub-projects and inspection lot acceptance.
This division of the project in the contracting unit on the basis of self-inspection qualified by the parties involved in the verification and acceptance.
3, other divisions of engineering quality
(1) roof waterproofing: roof waterproofing detailing is basically correct, the roof surface is not obvious water, roof water test without leakage, roof division acceptance of engineering quality to meet the standard.
(2) decoration division by inspection and acceptance: floor ground bedding without sand, cracks, hollow drums; bathroom water storage test without leakage; canopy wall smooth, no sand, cracks, hollow drums, peeling; doors and windows installed in the correct direction, open and close flexible, complete accessories; railing handrail installation is stable, the safety scale in line with the specification requirements; exterior wall tile bonding strength test 1 #, 2 # building **** test 20 groups, the test passed. Group, testing qualified.
Decoration division acceptance of project quality to meet the qualified standard.
(3) water supply and drainage branch project verification and acceptance: the project is strictly in accordance with the construction drawings, the raw materials used by the incoming acceptance are in line with the design of the design, water supply and drainage holes left in the location of the basic correct; pipeline fittings are controlled by the design requirements for the configuration of the installation; sewerage pipe slope to the correct, smooth drainage, no leakage; drainage pipe flooding test, through the ball test, the water test, pipeline no leakage phenomenon, water supply water pressure in line with the requirements of the water supply pipeline; pipeline and facilities installation. Pipes and facilities installation errors are in the construction error tolerance, acceptance of the quality of the project to meet the standards of conformity.
(4) electrical installation project by the verification and acceptance: the raw materials used in the project by the field acceptance are in line with the design design, power line piping in strict accordance with the map of the construction, wire connection circuit in line with the design requirements, phase insulation in line with the requirements; distribution box, switch socket installation location is correct, switch action is accurate; lightning protection and grounding system by the detection of the comprehensive quality is good, grounding system, lead system, the day surface of the flashover Grounding resistance are 0.40Ω, meet the design requirements for acceptance. Acceptance of the quality of acceptance to meet the standard.
(5) quality inspection and acceptance of insulation and energy-saving projects
The main thermal insulation measures of this project are three aspects: one is the external wall insulation, the use of polypropylene particles mortar insulation layer, thermal insulation slurry drawn from the Terry Building Materials Limited supply; the second is the use of plasticized steel windows and doors hollow double-glazing (5 + 9A + 5) thermal insulation; the third is the roof thermal insulation, the use of extruded plastic sheet (thickness 3mm ~ 5mm) as thermal insulation layer. Construction, the quality of incoming raw materials and construction process, the implementation of a witness sampling inspection to ensure that the quality of the project to achieve the design requirements of the thermal insulation and energy saving effect. Among them:
Glue powder polystyrene particles insulation test block 14 groups, 12 groups of external wall insulation plastic anchor bolt pull-out test, plastic anchor bolt 8 × 8mm quality testing 4 groups, external galvanized steel wire mesh (0.9 × 12.7 × 12.7mm) testing 6 groups, crack-resistant mortar, glue powder polystyrene particles testing 6 groups, the results of the test are in line with the requirements of the national acceptance standards.
Plastic steel window four test, glass dew point test, on-site airtightness test 1 group, the test results are in line with national acceptance standards.
The design accounting confirms that the project insulation and energy saving effect, to meet the design requirements.
4, construction measurement inspection
1, engineering positioning measurement record 1. Has been planning office retesting without error.
2, 43 records of axis checking, and its construction deviation is within the specification allowable deviation.
3. 43 records of elevation checking, and their errors are all within the allowable deviation of the specification.
4, verticality check record 39, the error are within the specification allowable deviation.
5, building settlement observation, the most recent settlement observation, no obvious settlement difference.
VII, sub-household inspection
The project is organized by the construction unit supervision, construction unit composed of sub-household inspection team, according to the "Chongqing Municipal Residential Project Quality Sub-household Inspection Implementation Guidelines (No. 1)" specified in the inspection project, the project's residential part of the building (structural) dimensional deviation and cast-in-place floor cracks, door and window installation, Walls, floors and ceilings, waterproofing works, glass installation works, building water supply and drainage works, building electrical works and ventilation and air conditioning works, etc., the inspection items of each inspection unit of the project have reached a pass rate of more than 90%, and the dimensional errors of the inspection points are all within the permissible deviation range, and the quality of the project has reached the requirements of the standard of sub-family inspection, and the inspection has been fully qualified. Sub-inspection records have been signed by the relevant responsible person.
Eight, the acceptance of human defense works
The building area of the human defense project 2114.10m2, bunker 1500m2. wartime for refuge and material storage, the period of peace for the garage. Part of the human defense project consists of diffusion room, exhaust engine room closed channel, the structure of the human defense project has been completed at the same time with the civil construction of the relevant branch project, the quality of the project has been in the civil construction of the relevant branch project acceptance through the acceptance. According to the requirements of human defense design, the casing of the water supply pipe of the human defense project was pre-embedded, the roof was installed with a storm wave floor drain, the basement drain installation was set up according to the requirements of the battlefield conversion, and the ventilation pipe was pre-embedded and fixed in the part of the airtight wall with the airtight coil, the storm door, and the anti-virus smoke door, etc., etc., which were all installed by the professionally qualified manufacturers. 2008 December 5 passed the pre-inspection and acceptance of the human defense project, and 2009 January 13 passed the inspection and acceptance of the human defense project. On December 5, 2008, it passed the pre-acceptance of the civil defense project and on January 13, 2009, it passed the acceptance of the civil defense project.
IX. Comprehensive Evaluation Opinions on the Quality of the Project
The project started on May 8, 2007, and the first pile acceptance was carried out on May 16, 2007; the intermediate acceptance of the foundation piles was carried out on June 8, 2007, and the acceptance of the foundation structure was carried out on September 4, 2007, and the intermediate acceptance of the main structure was carried out on January 8, 2008 The intermediate acceptance of main structure was carried out on January 8, 2008, and the acceptance of main project was carried out on March 5, 2008, and the construction quality of the rest of the branch projects was accepted and passed. energy-saving acceptance was carried out on November 21, 2008, and the acceptance of subdivided project was passed on December 26, 2008; the pre-acceptance of the project was carried out on December 30, 2008, and the acceptance of the manned defense was carried out on January 13, 2009.
The project is divided into foundation, main structure, decoration, roofing, water supply and drainage, electrical installation, heat preservation and energy saving and other 7 divisions 39 sub-projects, *** signing test batch acceptance records 1134 batches, the construction process of each process according to the test batch acceptance, the acceptance of the sub-projects have reached a qualified standard.
This project fire, human defense and other single acceptance has been passed, the project quality control information is complete, the appearance of the inspection does not affect the structural safety and the use of the function of the quality defects, the perception of the quality of the general, in accordance with the "unified standard for acceptance of the quality of construction works of building projects," GB 50300-2001, the quality of the project has reached a qualified standard, in line with the requirements for the completion of the acceptance of the project.
X. Conclusion
The supervision of this project can achieve better results, is that we have always implemented the "strict supervision, enthusiastic service" purpose, strict, scientific implementation, the implementation of construction-related laws and regulations, standards, Norms; strict compliance with fairness, integrity, scientific work guidelines, so as to win the trust of the owner and the construction side, to ensure the smooth progress of the supervision work. Mutual understanding, cooperation and support of all parties involved in the construction is essential to the completion of the supervision of external conditions, for which we are very grateful to the construction unit (owner) of our trust and support, thanks to the construction unit in the work of cooperation and understanding, so that we can successfully complete the task of supervision, to which I would like to express my gratitude.