After each layer is compacted, the paving and filling can be continued.
Representative samples shall be taken every 5 ~ 10m along the dam height for indoor physical and mechanical property test as the basis for checking the design and project management.
And constantly check the implementation of quality assurance system and personnel, instruments and equipment.
If it does not meet the design requirements and specifications, it shall be reprocessed and can be used only after passing the inspection.
During construction, qualified products must be submitted from the previous process to the next process, so as to ensure the overall quality of finished products.
key points of stockyard quality control (1) the quality control of stockyard must be strengthened, and a quality control station must be set in the stockyard.
The grading of filter material and transition material shall be controlled at the screening site, and the inspection of joints and protective measures shall be strengthened during filling.
(8) The instruments and operation methods for quality inspection shall be carried out in accordance with the specifications.
(3) The construction unit shall train the operators of rolling and leveling, unify the construction operation methods, and operate after passing the examination.
I.
(6) For the compaction quality control of impervious core, in addition to sampling and inspection at representative places of each compaction section, sampling must also be conducted at all suspected compaction places and all joints of the dam body to determine the dry capacity and water content.
(10) In quality analysis, mathematical statistics should be used to determine quality indicators and quality management chart should be used for quality management, so as to improve the level of quality management.
(4) The filter material shall be sampled for inspection before paving.
The measured paving thickness and rolling times shall be statistically analyzed frequently to study the improvement measures.
(8) for the filling of non cohesive soil such as inverted filter layer, transition layer and dam shell, in addition to sampling and inspection according to relevant regulations, the compaction parameters shall be mainly controlled.
(9) When vehicles often enter the road on the filling surface of core wall or inclined wall, samples shall be taken to check whether the soil layer has shear damage.
The quality inspection department shall truthfully record the plane position, elevation and inspection results of all sampling inspection parts, fill in the quality report shift by shift and day by day, and send it to relevant departments and principals.
key points for dam filling quality control (1) key items for dam filling quality inspection.
The quality inspection data must be properly kept to prevent loss, and it is strictly prohibited to destroy them by themselves.
(4) When formulating construction technical measures and determining construction methods and construction technology, the construction unit shall formulate the quality index of each process according to the actual situation of the site.
IV.
The construction unit must establish and improve the construction quality assurance system and set up a full-time quality inspection organization under the leadership of the main person in charge of construction.
The test method shall be mainly visual inspection and manual test, and a certain number of representative samples shall be taken for test.
(6) The quality inspection department of the construction unit shall participate in the divisional acceptance during the construction period under the leadership of the acceptance team with the participation of representatives of the owner and the supervision unit, especially the concealed works, and shall record the project quality in detail.
key points of construction quality control (1) the construction unit actively promotes total quality management in the construction of earth rock dam, strengthens personnel training, establishes and improves the responsibility system at all levels, so as to ensure that the construction quality meets the design standard, the project is safe, reliable and economical.
(5) Quality control shall be carried out in accordance with relevant standards issued by the state and the Ministry, engineering design and construction drawings, technical requirements and construction procedures formulated on the construction site.
III.
(11) The qualified rate of the dry bulk density measured by sampling shall not be less than 90%, and the unqualified samples shall not be concentrated, and the unqualified dry bulk density shall not be less than 98% of the design dry bulk density.
(7) During the filling of impervious core, generally, the soil paving and filling can be continued only after each layer is compacted and the dry volume weight measured by sampling is qualified, otherwise it shall be supplemented until it is qualified.
(2) Before dam filling, the dam foundation shall be carefully inspected according to the specifications.
(12) Several fixed sampling sections shall be selected for the impervious core according to the topography and geology of the dam site and the properties and construction conditions of the filling soil of the dam body.
(2) Construction personnel must be responsible for quality, do a good job in quality management, and implement the system of self inspection, mutual inspection and shift handover inspection.
The number of tests per shift can be determined according to the site conditions.
(13) During construction in rainy season, the implementation of construction measures shall be checked..
Once found, it must be completely reworked.
(7) During the construction, the construction unit shall write down the quality problems, treatment process and remaining problems of each shift in detail on the on-site shift handover record book, which shall be signed by the person in charge on duty.
(5) The dam compaction inspection items and sampling test times meet the specification requirements.
It is specified that one group shall be sampled every 200 ~ 400m3 to check the particle gradation and mud content.
(3) The design shall put forward some control indexes and items that are easy to identify on site for various dam materials.
(3) Educate quality inspectors and construction personnel to establish the viewpoint of “prevention first” and “quality first”; Both parties must cooperate closely to control the operation quality of each process and prevent quality accidents.
(2) Before construction, the specification and weight of rolling machines and tools shall be checked.
The rolling weight shall be checked every six months during construction; Check the tire pressure of the pneumatic tire roller once or twice a week.
Key points for quality control of dam foundation treatment (1) during dam foundation treatment, quality control must be carried out in strict accordance with the requirements of design and relevant specifications, and the inspection items and methods must be specified in advance.
(10) The on-site water content shall be measured by hand test for cohesive soil and gravelly soil, and the sample shall be measured by drying method or other methods, so as to correct the dry bulk density.
(9) A responsibility system shall be established for the test and instrument use, and the instrument shall be checked and calibrated regularly.
The construction unit shall organize construction, quality inspection, design, geology and other relevant personnel to implement the construction technical measures one by one before commencement.
(4) The compaction control index of impervious core adopts dry bulk density and water content; The compaction control indexes of inverted filter layer, transition layer, gravel material and rockfill shall be dry bulk density, and the relative density shall be checked if necessary.
If it does not meet the requirements, the construction personnel shall correct it in time.
(2) The quality control of the stockyard shall be carried out in accordance with the design requirements and relevant provisions of the specifications.
