A,Double-wheel milling of soil-cement mixing wallGeneral requirements for construction

1The following information should be available before the construction of double-wheel milling soil-cement mixed wall:

(1)Geotechnical engineering investigation report;

(2)Environmental survey data of surrounding buildings (structures) and municipal pipeline facilities;

(3)Survey data of adverse geology and obstacles in the base;

(4)Measurement of baseline and leveling data;

(5)Documents related to engineering design;

(6)The construction plan.

2Before construction, the construction plan should be prepared according to the design documents, engineering geology and hydrogeology conditions and surrounding environmental data.

3Before the formal construction, the construction ability, construction technology and technical parameters of the construction equipment should be determined through the trial wall test. For projects with high environmental protection requirements, the construction technology and technical parameters should be adjusted through the environmental monitoring results during the trial wall construction.

4When the deep mixing soil-cement wall is used as the water cutting curtain outside the grouting pile row, the soil-cement mixing wall should be constructed first, and then the grouting pile row.

Second,Double-wheel milling of soil-cement mixing wallPreparation before construction

1Before the construction of milling deep stir cement and soil mixing wall, the construction site, surrounding environment, transportation routes of mechanical equipment and materials, working space, underground obstacles and geological conditions affecting the quality of the wall and construction safety should be investigated.

2, the construction site should be smooth, the construction area of the surface hard objects and underground obstacles clearance, adverse geological treatment and other work. The bearing capacity of the foundation of the construction road should meet the requirements of the safe operation of heavy machinery such as equipment host and cranes.

3Before construction, a guide wall or guide ditch should be set up according to engineering geology and hydrogeology conditions, environmental conditions and vertical requirements. When environmental protection or vertical requirements are high, a guide wall should be set up.

4The construction of guide wall and guide ditch shall comply with the following provisions:

(1)When cast-in-place reinforced concrete guide wall is used, the bottom of the guide wall should be placed in the original soil layer and should be higher than the ground100mm, the net distance between the two sides of the guide wall should be increased than the wall design thickness40mm-60mm.

(2)When the guide wall is not set up, the guide groove should be set up, and the groove width of the guide groove should not be less than1.0m, the depth should be0.8m~1.5m . Steel plates should be set on both sides of the guide groove, and the width of the steel plate on one side of the main engine should not be less than6.0m. Thickness should not be less than20mm .

5Before the construction of milling deep mixing cement and soil mixing wall, measurement and lofting should be carried out according to the design document and checked and accepted. According to the determined construction sequence, the main engine, supporting machines and tools, automatic slurry mixing system, cement silos, core materials, etc., should be arranged in the location.

6The positioning control line of milling deep stirring cement and soil mixing wall shall be set according to the selected model, and positioning signs shall be set on the guide wall or guide ditch. When inserting the core material, the insertion position of the core material should be marked. The core material positioning guide frame and vertical positioning suspension members should be made according to the specifications and dimensions of the core material.

7,The water supply at the construction site should meet the construction requirements of the soil-cement mixing wall, and the diameter of the water supply pipe should not be less than80mm .

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