SMWmethodConstruction unit construction quality control measures
1Before construction, the ground should be level off and all obstacles above and below ground must be removed;
2Before starting the machine must be debugging, check the operation of the pile machine and the smooth situation of the feeding pipe;
3,Ensure the perpendicularity: After the equipment is in place, it must be smooth to ensure that there is no inclination or movement during the construction process. Attention should be paid to ensure the vertical degree of the frame and drill pipe, and the deviation of the vertical degree should not be greater than1%. During the construction, the hanging hammer is used to observe the perpendicularity of the two directions of the drill pipe and the horizontal water gauge is used to measure the leveling of the frame. If the deviation is too large, it will be adjusted in time.
4,Grout segregation cannot occur, cement grout should be made strictly according to the predetermined proportion, to prevent mortar segregation, slurry must be stirred before putting30Second and then pour into the slurry bucket;
5,In strict accordance with the design parameters to control the amount of spray and stirring speed. Sufficient slurry pressure must be ensured during the slurry delivery stage to provide continuous slurry. Once the slurry is stopped for some reason, in order to prevent broken pile and lack of slurry, the stirring head should be sunk to the stop point0.5Below the meter, until the slurry supply is resumed before spraying stirring; Such as stop pulp3More than hours, must immediately carry out a comprehensive cleaning, prevent cement in the equipment and pipeline, affect the construction;
6Strictly control the sinking and lifting speed during stirring to ensure that each depth in the reinforcement range can be fully stirred to ensure the strength and uniformity of the pile body; The lifting speed should not be too fast to avoid the phenomenon of hole wall collapse. Pile construction, shall not be flushed down;
7During construction, if the drill pipe cannot be drilled due to underground obstacles and other reasons, the supervisor and designer should be informed in time so that pile filling measures can be taken in time to ensure the construction quality;
8, in strict accordance with the design of the water cement ratio to prepare the slurry, in the construction of strict measurement work, prepared slurry must be filtered;
9,If THE AMOUNT OF SHOTCRETE is found insufficient during construction, the whole pile shall be stirred according to the requirements of the supervision engineer, and the amount of SHOTcrete shall not be less than the designed amount. In case of power failure and mechanical failure, the interruption depth should be recorded in time when the grouting is interrupted. in12Take supplementary spraying treatment measures within hours, and fill in the supplementary spraying information in the construction record. The overlap of supplementary spray should be greater than100cmAnd more than24When the pile filling measures should be taken on the outside;
10In the construction process, a specially-assigned person is responsible for filling in the construction record. The construction record form shall record in detail the pile position number, pile length, section area, sinking (lifting) time and depth, cement dosage, cement incorporation ratio and water-cement ratio;
11,In order to ensure the quality of pile end, pile top and pile body of cement mixing pile, it should stay at the bottom of pile when the grouting is lifted for the first time30Second, grinding the pile end, spraying the residual slurry into the pile body during the lifting process, and grinding the pile head at the top of the pile, the residence time is30Seconds;
12,In case of cold joints in the construction process, the scheme of adding stirring element pile to the outer side of the retaining pile at the cold joints is adopted, and the reinforcing pile is carried out after the retaining pile reaches a certain strength to prevent drilling deviation and ensure the effect of reinforcing pile. The lap thickness between the plain pile and the retaining pile is about10cm;
13,The section steel shall be confirmed by the construction personnel on the scene. Check the flatness and welding quality of the section steel and confirm that the quality meets the construction requirements before proceedingHSection steel insertion construction;
14The bottom of the section steel stacking need to be padded with sleepers to reduce the distortion of the section steel, the section steel needs to check the straightness of the section steel again before inserting, to ensure the smooth insertion of the section steel.
Shanghai Qiangqiang Foundation Engineering Co., LTD. 's business covers foundation pit engineering, pile foundation engineering, land and waterFoundation treatment, slope treatment and other engineering fields. around"Excellent technology, reliable process, fast construction" technical requirements, is to provide customers with land, water foundation engineering technical consultation, construction services and other comprehensive solutions of the entity enterprise.Contact Number:400-1002850