SMWmethod Construction quality assurance measures
1Protect pipelines in surrounding areas
(1) Before construction, investigate the buried depth, path and enclosure distance of surrounding pipelines, especially large-caliber pressure pipelines, and set up monitoring points for real-time monitoring during the whole construction process.
(2Effective measures should be taken immediately, such as controlling the construction speed of mixing pile and adjusting process parameters.
2,SMWmethodControl of construction period
(1) Do a good job of grading technical disclosure and pre-job training of the construction team operators, and work with certificates to ensure the quality of work.
(2When the material is delivered to the site, the material warranty shall be submitted at the same time.The cement shall be tested for stability, and the test report shall be completed before the formal construction to ensure the use of cement with design strength grade. The incoming cement shall be submitted for inspection in time and can be used only after passing.
(3For multi-specification pile length and section steel length, the technical responsible person shall issue the operation instruction of the same day during the construction process to clarify the operation requirements. During the construction process, quality personnel should check immediately and make hidden records. After the shift by the monitor and quality personnel to check, to prevent mistakes.
(4Ensure the good performance of construction machinery and equipment, timely routine maintenance during construction, test the grouting pump grouting volume per minute, prepare a set of emergency standby grouting pump to ensure the uniformity and continuity of grouting.
(5During piling, each machine should make a set of side length specifications every day7.07cmThe square test block is taken from the cement soil lifted by the last mixing bit and attached to the bit. After the test block is made, it should be numbered, recorded and maintained, and sent to the laboratory in time.
(6) In the construction process, if the construction time is too long due to obstacles, mechanical equipment maintenance, power failure and other accidents, it is necessary to fill piles on the outside of the two adjacent piles.
3To ensure the strength and uniformity of the pile body
(1) Manually control the cement flow and grouting pressure, strictly control the amount of mixing cement per barrel and the height of liquid level, control the total amount of water, and check the specific gravity of cement slurry with a specific gravity meter at any time. The soil should be thoroughly stirred, the drilling subsidence and lifting speed should be strictly controlled, and the original soil should be fully broken, which is conducive to the uniform mixing of cement paste and soil.
(2Grout can not be isolated, cement grout should be made in strict accordance with the predetermined proportion, in order to prevent mortar segregation, must be stirred30Seconds to pour into the slurry bucket.
(3) During the grouting stage, the grouting pipeline shall not be blocked or broken. The whole pile must be uniformly grouting, and the sandwich layer of soil slurry shall not occur.
(4When the pipeline is blocked, the pump should be stopped immediately. The stir drill shall rise and sink immediately after treatment1.0mCan continue grout, etc10～20Second to resume stirring up to prevent broken pile.
4And quality control of maintenance period before excavation
(1) according to the400TBulk cement,200TThe packaged cement is one inspection lot, and the cement should be sent to the laboratory in time28Day cement inspection.
(2(The mixing pile test block should be sent to the laboratory in time28Day unconfined compressive strength test, the measured compressive strength shall not be less than the design strength.
5, insert steel quality assurance measures
(1) When the section steel is on the scene, it shall be confirmed by the supervisor, who shall inspect the flatness and welding quality of the section steel and consider the quality to meet the construction requirements before proceeding with the construction of the section steel.
(2) Section steel should be hung one by one, and the bottom of the section steel should be padded with sleepers to reduce deformation of the section steel. Before inserting the section, check the flatness of the section to ensure that the section is inserted smoothly.
(3) Before inserting the section steel, the positioning equipment of the section steel must be fixed accurately and the levelness must be checked.
(4) Section steel hoisting, with the theodolite to adjust the vertical degree of the section steel, meet the requirements of vertical inserted into the section steel, with the level control of the top elevation of the section steel, to ensure the insertion depth and indwelling length of the section steel.
(5Before lifting the section steel, it is necessary to re-check whether the antifriction coating surface is complete.
Shanghai strong Tianjin Yujiapu projectSMWConstruction method super deep pile
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
