1 Establishment of central laboratory in highway engineering site
The laboratory in the center of the site will be tested by an independent third party through bidding, and the testing unit must be a comprehensive Grade B or Grade A laboratory to participate in the bidding. The laboratory construction and equipment requirements are set according to the bidding requirements, with sufficient financial support, high standards, wide management, high test frequency and high utilization rate of equipment, which is more effective for the management of engineering test data and engineering quality.
1. 1 The staffing of the central laboratory should meet the needs of engineering construction, and it can be divided into indoor work and on-site inspection according to the construction site conditions.
1.2 test and testing equipment and management (1) According to the needs of authorized test and testing projects, the site central laboratory will build test and testing rooms, mainly including mechanics room, cement room, concrete room, aggregate room, geotechnical room, chemical room, field testing room and sample room. The area of each room shall not be less than 20 square meters. The laboratory room should meet the requirements of good ventilation and lighting conditions, power supply and drainage must be in place, with a solid foundation and sufficient operating space. The chemical room is equipped with ventilation device, pay attention to the safety of electricity use, standardize the management of dangerous goods and the treatment of waste residue and liquid, and ensure the health of testers. (2) Testing equipment is the hardware of the laboratory and the material basis for testing. The use, accuracy and precision of equipment directly affect the quality of testing work, so attention should be paid to the reliability of equipment operation. Equipment management must complete the following tasks: ① establish equipment account; Card records equipment performance, random accessories, accuracy, etc. ② Establish post responsibility system.
The test data of 1.3 (1) is inconsistent with the actual situation. It is difficult for limited testers to complete the daily field compaction and water content test, which is quite different from the actual situation and seriously inconsistent. (2) Inspection ledger, some original records are not perfect. The information in the test report is incomplete and the conclusion is not perfect.
2 highway engineering field center laboratory and field test comparison
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(2) Test quality inspection is different from project management. It has certain standard requirements and data accuracy requirements, and is the main basis for judging whether the engineering quality is qualified or not. The implementation of testing system in central laboratory can improve engineering quality and make engineering quality management more scientific, standardized and professional. Its advantages mainly include: ① One site central laboratory can replace the original two or four resident laboratories. The test workload of the site central laboratory is wide, which is conducive to unifying standards and accuracy, and is more conducive to the test management of engineering quality. It can give full play to the ability of testers and effectively use the resources of social laboratories. (2) The data processing of the laboratory test in the site center is more professional and more detailed, and it is less interfered by other factors, while there are more factors from personnel and working environment that interfere with the field test. The testing center is only responsible for the test results, and makes a conclusive report on the quality test results and quality trends. For the supervision engineer to choose the project.
3 responsibilities of laboratory work
(1) Positioning of the central laboratory of highway engineering site: As a third-party testing and testing institution independently invited by the owner, it belongs to the field laboratory and is responsible for the field testing and testing. Its work covers the whole process of field sampling, testing and testing according to the test requirements (i.e. test and test notice) put forward by the owner or supervisor, until the test report is issued and suggestions are made according to the test report. The project, content and frequency of the test are determined by the test notice of the supervision unit, and the supervision tester can stand by and confirm the test results. The owner entrusts the central laboratory to be responsible for the test and detection of this project.
(2) The temporary qualification of the site center laboratory shall be filed with the municipal traffic quality supervision station, and the testing work can be carried out only after the filing approval. (3) The supervision and management of the central laboratory by the parent laboratory, the rules and regulations and management measures of the central laboratory, and the aging table of the testing cycle are fully implemented in the form of detailed rules for testing implementation. (4) The test supervision engineer can stand by the central laboratory for the whole test process and sign the test results of the central laboratory for confirmation. (5) The sampling frequency of the construction site shall be strictly controlled by the test supervision engineer according to the relevant provisions of the tender documents. For testing items and frequencies other than routine testing, a qualified third-party testing unit shall be entrusted for testing after obtaining the consent of the owner.
4 conclusion
In the future, the central laboratory of the construction site will be a development trend, and the test and detection will be centralized, which will bring convenience to the construction unit. The construction unit does not need to establish a site laboratory, thus reducing the investment of personnel and equipment, which is also a cost saving for the construction unit. It is a good quality control method for owners and supervisors.
The above are collected and sorted by Zhong Da Consulting Company.
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