Discussion on quality assurance system and measures of diversion tunnel project.

Quality assurance system and measures of diversion tunnel project

A long-term plan, quality first. In order to ensure the excellent project, under the leadership of the company's quality management committee, each project set up a quality management leading group, established a quality management control network, formulated strict quality assurance measures, implemented total quality management, implemented ISO9002 quality standards, and implemented a quality one-vote veto system.

1 project quality objectives

The quality of the project has reached an excellent level.

2 Quality organization and management assurance

Establishing a sound quality organization and management network can effectively perform its duties and run through the whole process of construction and production. It is an important condition for ensuring project quality and achieving excellent project objectives, and it is also an important condition for supervising, improving and ensuring project construction quality.

2. Quality management organization

The quality management leading group consists of the project manager, the deputy project manager, the chief engineer and the director of the quality office. Quality management is based on the project chief engineer. 0, composed of technicians, measurement technicians, quality inspectors, internal auditors and testers.

(l) The Project Department shall set up a leading group for project quality management, consisting of the following personnel:

Team Leader: Project Manager

Deputy Team Leader: Chief Engineer and Deputy Project Manager.

Team members: quality inspector, quality inspector, internal auditor, technician, measurement technician, tester, builder, etc.

(2) Establish a QC team consisting of 4-5 people, which is mainly responsible for organizing and mobilizing employees to carry out QC team activities, conducting quality education, organizing quality research, and controlling the quality of tunnel excavation and tunnel concrete lining.

2.2 Quality Management Control Network

3 engineering quality assurance measures

3. Management measures

Fully implement ISO9002 quality standards, establish a quality assurance system with the chief engineer of the project as the core, set up a quality management team, establish a quality internal audit system, and equip full-time quality inspectors to be responsible for quality inspection; Clear quality goal: excellent project. Formulate post responsibility system, standardize inspection and inspection management procedures, carry out total quality management and QC group activities, strengthen process quality control, and quality control before and during the process. Seriously study the requirements of relevant construction specifications, technical specifications and bidding documents, and conduct quality inspection and evaluation.

3.2 strictly implemented in the construction; Three inspection system.

Select professional and technical personnel with rich theoretical and practical experience, high professional and technical quality and ideological quality, strong organizational and management ability and serious and responsible work as full-time quality inspectors. Implementation; Three inspection system; First, reasonably determine the scope of special inspection, self-inspection and mutual inspection. Generally, full-time quality inspectors are mainly responsible for the inspection of single projects and sub-projects; In the process of construction, the process inspection is mainly based on the self-inspection and mutual inspection of construction personnel, supplemented by the patrol inspection of full-time quality inspectors. Secondly, workers should pay attention to the following points when conducting self-inspection and mutual inspection:

(l) Clear inspection contents, including inspection items, inspection standards, inspection, test scheme and inspection methods;

(2) Provide necessary conditions and means: measuring instruments, test equipment and sites, etc.

(3) Improve the original record system;

(4) Establish a quality evaluation system and combine ideological education with material encouragement.

3.3 Other guarantee measures

(l) Read the design drawings and documents carefully, do a good job of technical disclosure, and construct in strict accordance with the design documents, design drawings, specifications and quality requirements of the competent department; Conscientiously make construction records and establish quality and technical files; Provide quality reports and technical data to the construction unit and supervision engineer on a regular basis, and accept the inspection and supervision of the construction unit and supervision engineer.

(2) Set up a site laboratory, equipped with professional testers and necessary test equipment. The field laboratory is mainly responsible for the on-site measurement and adjustment of super-particle size and moisture content of concrete aggregate, fineness modulus, silt content and moisture content of sand, on-site supervision and adjustment of crushing and mixing quality and warehouse surface pouring, as well as on-site sampling, production and timely delivery of test blocks. The design of concrete mixture ratio, compressive strength of concrete block and test of reinforcement materials shall be tested by the company's laboratory or relevant units designated by the owner.

(3) Equipped with professional survey team, responsible for the construction survey of tunnel excavation and lining, shaft excavation and lining, and set up enough control points to ensure the accuracy of construction position, direction and elevation.

(4) The concealed works can be covered only after they are accepted by the supervision engineer.

(5) Implement the quality control management of the whole construction process, and the on-site construction management personnel will follow the shift, and the quality inspector will often go to the site for regular and irregular quality inspection. During the construction of important parts, the quality inspector should implement the whole process; On-site supervision system.

(6) Equipment, instruments and measuring instruments used for testing must be kept in good performance and meet the requirements, and be inspected by relevant technical supervision institutions.

(7) Implement the quality one-vote veto system and the system of rewarding the excellent and punishing the poor.

4 whole process quality control

In the process of construction, combined with the company's previous construction experience, while grasping total quality management, we must insist on paying attention to appearance quality, not ignoring details, and ensure the integrity and accuracy of construction records. In the increasingly fierce market competition, today's quality is the development of enterprises tomorrow. According to the company's requirements, ensure the excellent quality of the project.

4. 1 Organize the construction according to the requirements of ISO9002 quality system.

Our company has passed the ISO9002 quality certification. During the implementation of this project, we must conscientiously implement GB/ 19002-ISO9002 series standards, strictly follow the requirements of our ISO9002 quality system, and strictly control during the construction. According to the company's "procedure document" and "quality manual", quality management is carried out from quality plan, contract review, material procurement verification, construction process control, inspection and test control, inspection and test equipment control, unqualified product control and quality records, documents and data control, so as to form an effective quality assurance system in line with ISO9002 series standards in the whole construction process.

4.2 Establish a quality assurance system

In order to ensure the construction quality, a quality management network based on the project manager is implemented in the construction site, project quality target management is formulated, the work responsibilities of various departments are defined, and a quality responsibility assessment system is implemented. The quality room is mainly responsible for the site, and each operation group has full-time quality inspectors who are responsible for the acceptance and strengthen the quality monitoring and testing means. In the aspect of purchasing quality of raw materials, the company formulates the purchasing plan of key control materials, and the technical office is responsible for examining and approving the technical indicators and requirements of special materials. In the process of purchasing, the buyer is responsible to the material engineer, who is responsible to the project manager. In terms of engineering quality, each construction operator is responsible for the construction team leader and professional quality inspector, the project manager and the engineering quality. In order to ensure that every member of the quality assurance system does not miss any quality problems in the construction process, at the same time, the quality management rules and regulations are formulated and the quality veto power is adhered to.

4.3 Material quality control measures

Quality management starts with raw materials and strictly controls quality. The main materials of the permanent project should have factory certificate and quality certificate, and can be used only after passing the test and inspection.

Ensuring the quality of material procurement and preventing unqualified products from entering the project is the basis of creating a good project. Therefore, only by following the quality management procedures of material procurement can the supplied materials meet the standards.

4.4 Process control

4. 4. 1 construction preparation stage

(l) Organizational preparation: The project department is equipped with business backbones to be responsible for construction management, and posts will be created and responsibilities will be fixed.

(2) Personnel control: technicians and project department managers who have passed basic training and on-the-job training shall pass the qualification examination and meet relevant regulations before taking up their posts.

(3) Technical preparation: Before starting work, carefully study the construction drawings and related documents, be familiar with the design requirements, understand the design intent, be familiar with the relevant technical regulations and construction specifications for quality acceptance, conduct site reconnaissance and investigation, and then conduct the blue prints.the design and technical disclosure.

(4) Planning: Prepare detailed quality plan, construction schedule plan, arrival time of materials and equipment and labor demand plan. Equipped with sufficient construction equipment, all equipment should be debugged before entering the site, and the placement of all equipment should comply with the Management Measures for Construction Equipment and Party A's requirements.

(5) Plan control: The implementation and execution of the plan should be carried out in stages, and it should be checked and adjusted regularly to ensure that it meets the requirements.

(6) Material control: All raw materials, finished products and semi-finished products shall meet the specified requirements.

4.4.2 Construction process control

(l) Technical document control: On the basis of self-examination, joint examination of design drawings shall be conducted, and joint examination records shall be kept.

(2) Technical disclosure: Technical disclosure shall be made before commencement, including disclosure of construction organization design. The design disclosure and construction technical disclosure of each working procedure should be signed and confirmed, and records should be filled in.

(3) Technical evaluation criteria: general operating procedures, operating templates, new technologies, etc. Technical and process evaluation standards should be provided to operators in the clearest and most practical way.

(4) Key process control: Operators must operate in strict accordance with the construction specifications; The testing tools and instruments used in the operation process shall be recorded; Concealed engineering projects shall apply for inspection, which shall be inspected by the project quality controller and supervision engineer * * *, and can be transferred to the next working procedure after being approved and signed.

(5) Special process control: the quality of some processes can not be completely determined by product testing, and some processes can not be tested or destructively tested after construction. The project department should have the ability to identify the process in advance, operated by on-the-job personnel, and send technicians to continuously monitor the relevant process parameters.

(6) Technical data control: All technical data shall be signed, authenticated, sorted and classified according to filing requirements, and corresponding records shall be made.

(7) Synchronous operation: According to the construction progress plan, the construction site requires materials to enter the site and test synchronously, and do a good job in flow construction.

(8) Environmental control: natural conditions (such as temperature, etc. ) has a great influence on the engineering quality, and the construction shall be strictly controlled according to the relevant requirements.

4.4 Quality Control in Completion Stage

After the completion of the project, the project department shall apply to the construction unit for withdrawal and completion acceptance, and the technical data shall be handed over to the construction unit, and the handover procedures shall be handled. The project department is responsible for project protection, return visit and maintenance.

4.5 Inspection and test control

Inspection and testing of materials. According to the actual needs of the project, equipped with sufficient measuring, testing and testing equipment. The material engineer is responsible for sending the purchased materials to a qualified testing unit for testing according to the inspection and test requirements. Feedback to the quality inspector in time after the test.

(2) the project department inspector is responsible for the process inspection. Check every working procedure on the construction site. After the evaluation, please check with the owner and the supervisor, and the next process can be carried out only after the visa is issued. The quality department of the company conducts spot checks on the project department to supervise and inspect the normal work.

(3) The quality department of the company and the project department are jointly responsible for the inspection of the final products. After the company's self-inspection evaluation, it will be inspected by the supervisor and the owner's quality inspection station to evaluate the quality level.

(4) All inspection and test items of this project are entrusted to qualified testing institutions designated by the owner's supervision. The quality department of the company is responsible for the inspection of equipment. The measuring instruments (total station, latitude and longitude discussion and leveling discussion) put into this project have been verified by Hangzhou Technical Supervision Bureau or other statutory technical supervision departments before use. Available measuring instruments should be stored in a special location, and daily maintenance should be carried out by a special person.

4.6 Control of nonconforming products

Unqualified products include unqualified materials and processes. For the goods that are really unqualified after inspection, the construction site should be cleaned within 24 hours, and the unqualified processes (process products) should be reworked and rectified immediately.

4.7 Quality control of engineering survey

The quality work of engineering survey is implemented by the survey team, and the quality control of engineering survey is as follows:

(l) Be familiar with the design documents, be responsible for receiving the original datum points, baselines and elevations provided by the Owner, and verify the retest results;

(2) protection control points and protection piles;

(3) Calculate the lofting data according to the design documents, measure the proportion, height and line type of the lofting project, and be responsible for the lofting results;

(4) Do a good job of measuring and setting out in each cycle, check the excavation quality in the last cycle, and control over-excavation and under-excavation.

(5) Make measurement records, which should be neat and convenient for inspection.

(6) According to the construction progress, control the traverse in time and check it frequently.

(7) Carry out indoor measurement work, and sort out and summarize the measurement results.

4.8 Quality Control in Construction Process

4.8. 1 hole excavation quality control:

① Choose reasonable drilling and blasting parameters according to different geological conditions.

(2) Do a good job of measuring and setting out before entering the site to improve the accuracy of line drawing and shooting.

(3) Strictly control the drilling accuracy, smooth blasting, one-time excavation of the whole face, application of millisecond detonator and smooth blasting cartridge in peripheral eyes, and decoupling charging, so as to reduce the impact of blasting on surrounding rock and ensure that the tunnel excavation specifications meet the quality requirements.

(4) Ventilate in time after each row of guns, and carry out dangerous operations in time after entering the working face to create a safe space for the next operation.

⑤ Conduct section detection and blasting effect evaluation in time after each row of guns, and deal with those that fail to meet the standards in time, analyze the reasons, and put forward rectification measures to provide rectification basis for the excavation of the next row of guns.

⑥ Tunnel excavation quality control procedure.

4.8.2 Quality control of bolting and shotcreting support

(1) Strictly control the quality of raw materials such as cement, sand, gravel and steel bars.

(2) Stabilize the water pressure to ensure the quality of bolting and shotcreting support.

(3) The anchor length, diameter, hole depth, hole spacing and row spacing should meet the design requirements, grouting should be full, and the anchoring force must meet the design requirements.

(4) Before shotcrete construction, clean up the pumice and other sundries on the spraying surface, and spray water on the spraying surface with a jet machine.

⑤ Control the strength of sprayed concrete, mix materials in strict accordance with the design mixture ratio, and the average compressive strength of the same batch of test blocks should meet the design requirements.

⑥ Control the thickness of sprayed concrete to meet the requirements of sprayed concrete quality and evaluation.

⑦ Regularly check the powder surface and resilience of sprayed concrete, and adjust the spraying direction and working pressure according to the actual situation to make it as little as possible.

Today, the sprayed concrete surface should be smooth and level, and sprayed with water for maintenance according to the specifications.

Pet-name ruby bolting and shotcreting support quality control program

4.8.3 Quality Control of Concrete Lining

Concrete lining is the main sub-project of tunnel construction, which has many procedures and high quality requirements, so the quality must be strictly controlled. For some concealed works in lining, such as steel bars and bedrock surface, etc. , must be covered and transferred to the next working procedure after acceptance by the supervisor.

8-7 Block diagram of concrete lining quality control program

(1) Strictly control the quality of cement, sand and gravel, and construct in strict accordance with the mix proportion to ensure the grade and quality of concrete;

(2) The shaped steel formwork shall be installed in strict accordance with the installation drawing to ensure the installation accuracy;

(3) The shaped steel formwork must be accurately positioned by surveyors with instruments, and can be poured only after being tested and approved by the supervision engineer;

(4) Ensure that the pouring surface is clean, the foundation is clean and meets the requirements, and reliable drainage measures should be taken for the working face with water leakage. The plug of the steel mold must be firm and the joint should be tight to prevent slurry leakage;

⑤ After the formwork is removed within the specified time, it shall be maintained according to relevant specifications to ensure the pouring quality. When pouring, the early strength agent should be put into use as designed;

⑥ Before pouring, check all equipment and power supply to prevent stopovers. If the stopover time is too long, the construction joints should be treated.

4.8.4 Backfilling grouting and consolidation grouting

(1) The drilling of grouting holes shall be carried out in sections according to the grouting procedure, with accurate hole position and hole depth meeting the design requirements, and the deviation at the bottom of the hole shall not be greater than 1/40 hole depth.

(2) After drilling is completed, the grouting hole shall be flushed and properly protected according to regulations until it is accepted.

(3) The preparation of grouting slurry should be carried out in strict accordance with the requirements of hydraulic grouting specifications, and be prepared and used according to the different needs of each grouting point.

(4) After grouting, slurry closing measures must be taken to prevent slurry leakage.

⑤ Grouting work should be strictly recorded and tested, and the pressure gauge should be checked frequently.

⑥ After grouting is completed, seal the hole with cement mortar through mechanical grouting and level the hole.

⑦ Consolidation grouting is divided into grouting units according to the principle of sequential encryption, and grouting units are classified between rings and encrypted within rings.

5 Quality inspection and evaluation and quality data

5.l Engineering quality inspection and evaluation

(1) The engineering quality acceptance standard shall be implemented according to the Evaluation Standard for Engineering Quality of Water Resources and Hydropower Capital Construction Units (SDJ249-88), and the engineering quality acceptance shall be implemented; One vote veto; System.

(2) Division and subdivisional work shall be carried out according to the notice of the supervision engineer.

(3) The project shall not enter the next working procedure without acceptance or unqualified acceptance.

(4) After the construction is completed, all subdivisional work shall promptly organize relevant personnel to carry out inspection and evaluation (including concealed works). Quality inspection data should be filled in before engineering inspection and evaluation, and signed when acceptance.

5.2 Quality data

(l) Quality data is a portrayal of the construction process, which truly reflects the whole process of engineering construction, and is also the main quality data related to the safe operation of the project, and its significance is extraordinary. Therefore, we must attach great importance to it.

(2) The Project Department shall designate a special person to be responsible for filling, collecting, sorting and summarizing the quality information.

(3) The Project Department shall establish a set of forms from tests, processes, materials to geology, and collect all kinds of data.

(4) When filling in quality data, the data should be timely and true, and the handwriting should be neat and clear.

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