(2) Before learning and disclosing the construction of soft foundation treatment engineering, organize management and technical personnel at all levels to learn construction drawings, construction specifications, contract documents, and relevant specification requirements, and conduct step-by-step technical and safety disclosures to the construction personnel and technical personnel of the project department, as well as on-site construction personnel.

The main methods of soft foundation treatment at different depths are: the depth of soft foundation treatment H ≤ 3.0m, using dredging and replacement treatment; The depth of soft foundation treatment is 3.0m ＜ H ≤ 15.0m, and cement mixing piles are used for treatment; Soft foundation treatment depth H>15.0m, using CFG piles for treatment; The deeper section of the soft foundation is basically a bridge crossing.

1 Scope of application: The terrain along the the Middle and Lower Yangtze Valley Plain area fluctuates slightly, the engineering geological and hydrogeological conditions are relatively simple, and the unfavorable geology is mainly represented by soft soil foundation.

② Erect power lines and equip backup generators to prevent sudden power outages Leveling the site, removing cultivated soil and debris (tree roots, garbage, etc.), pumping water to clear sediment in low-lying areas, and backfilling cohesive soil fill in layers, compacting and leveling.

Lifting Pin Anchor

(3) The organization of construction machinery and equipment selects standardized and qualified products.

Preparation work before construction (1) Preparation of technical data for soft soil foundation engineering geological survey report, soil test report, design pile position layout of cement mixing pile, as well as original ground elevation and reinforcement depth; Survey data: including survey records of horizontal control piles and benchmark; Minutes of the design briefing meeting.

(5) Construction site preparation: ① Build construction access roads to facilitate the entry of material transportation vehicles and mechanical equipment.

The construction of cement mixing piles must be equipped with a powder spraying recorder and calibrated by the national metrology department.

The main raw material for cement mixing pile construction is cement.

2.

Before construction, inspect and test run the machinery and equipment to ensure that they are in good condition.

It is necessary to excavate and install drainage ditches according to the actual situation on site, and introduce the existing ditches
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The special construction plan has been approved by the Chief Supervision Engineer.

Before entering the site, quality inspection must be carried out according to the requirements of the specifications, and only after passing the inspection can it be used.

Cement mixing pile treatment can effectively improve the bearing capacity and loading rate of soft soil foundation, and reduce the total bearing capacity of the roadbed.

The walking PH-5D bidirectional mixing pile machine is used for construction (4) Material preparation.

The soft soil mainly consists of flow plastic sludge and soft plastic flow plastic mucky soil, which are characterized by high water content, high porosity, high compressibility, low permeability, low shear strength, significant thixotropy and creep.

The main mechanical equipment for cement mixing pile construction include: walking PH-5D bidirectional mixing pile machine, ash tank, air compressor, and generator.