Piling preloading soft foundation treatment structure and method

Abstract

The invention discloses a piling preloading soft foundation treatment structure and method. A sand cushion layer is paved on a foundation to be piled and a cofferdam is arranged on the ground at the periphery of the sand cushion layer; a cofferdam pit is enclosed by a region in a preloading treatment range of the foundation to be piled through the cofferdam; a water storage structure is formed bypaving waterproof sealing films on an inner-side surface of the cofferdam pit and the surface of the sand cushion layer along the cofferdam; a plurality of water pumping structures for injecting waterinto the cofferdam pit are mounted on the cofferdam. According to the piling preloading soft foundation treatment structure and method, a cofferdam water injection and piling method is adopted; wateris injected and piled to meet unloading requirements; then the water in the cofferdam is pumped through a water pump; then a plastic cushion layer is removed. The soil cofferdam is used as foundationsettlement compensation earth and stones and backfilling and rolling are carried out; then residual earth and stones are discarded; materials are convenient to take, wastes of the earth and stones ina traditional method are reduced and the engineering cost is saved; a treatment process is simple and rapid, a construction period is shorter and the cost is low; resource wastes are not caused and influences on environment and peripheral traffic are small.

Description

technical field [0001] The invention relates to the technical field of foundation treatment construction, in particular to a soft foundation reinforcement treatment structure and method using a surcharge preloading method. Background technique [0002] The surcharge preloading method means that after the load is applied on the saturated soft soil foundation, the pore water is slowly discharged, the pore volume shrinks, and the foundation undergoes consolidation deformation. At the same time, as the superhydrostatic pressure gradually dissipates, the effective stress gradually increases, and the strength of the foundation soil gradually increases. After reaching the predetermined standard, it is unloaded to make the foundation soil compact, settle, and consolidate. It has been widely used in foundation treatment projects such as port projects, industrial and civil buildings, and airport runway construction at home and abroad, and has achieved good reinforcement effects and ob...

AI Technical Summary

Problems solved by technology

Generally, materials such as loess and mountain rocks are used as materials for stockpiling. However, due to the lack of earth and stone materials that can be mined in coastal beaches and other places, and the strengthening of environmental protection requirements in recent years, the method of taking materials that damage the natural environment is strictly prohibited, resulting in sometimes Insufficient sources, tight transportation, difficult turnover and other reasons directly affect the construction progress, resulting in long construction period and high project cost

During the transportation of stacked loads, it will have an impact on the environment along the transportation line and the surrounding environment, and the peak period of construction will seriously affect the local traffic

[0004] Moreover, the amount of piled earth and rock is as many as hundreds of thousands of cubic meters. After the foundation soil meets the unloading requirements, the piled earth should be removed. Except for a very small part of the earth consumed by backfilling, the rest of the earth must be discarded. The earthwork is still as high as hundreds of thousands of square meters, causing a lot of waste, and the earthwork processing is also difficult and costly

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