Soft soil foundation reinforcing method and pipe ram for reinforcement

Abstract

The invention relates to a soft soil foundation reinforcing method and a pipe ram for reinforcement. A ramming pipe is combined with a vibration hammer; vacuum water absorption pipes are arranged on two sides of the ramming pipe; a material inlet is formed in the ramming pipe, and a pipe rammer is arranged in the ramming pipe; by opening and closing of a tongs-shaped detacher, the pipe rammer can rise up and drop down, to reach required ramming energy and meet a reinforcing requirement; in a ramming process, ramming and water drawing are carried out at the same time to fulfill the aim of quickly dissipating after-ramming super-static pore pressure; plastic-flow type mud soil which cannot be rammed is replaced by soil with higher quality through the material inlet; a land subjected to reinforcement treatment can reach an ideal compactness bearing force index. According to the soft soil foundation reinforcing method, the construction steps are simple, the period is short, and the cost is low; by ramming from deep to shallow, the characteristic value of the bearing force of foundation soil within a reinforcement range can be increased by times, so that the physical and mechanical indexes of soft soil are greatly changed; by control over the ramming energy and replacement of a required layer thickness, the soft soil with any property can be reinforced, and a reinforcing layer thickness can reach 20 to 30 m.

Description

Technical field [0001] The invention relates to a method for strengthening soft soil foundations and a pipe ram for strengthening, which is suitable for strengthening treatment of soft soils whose sites cannot meet the required bearing capacity and compaction of design, and belongs to the technical field of foundation treatment. Background technique [0002] At present, the reinforcement of soft soil foundation through precipitation measures has enabled the dynamic compaction technology to be widely used. The forced compression or compaction of the soil during the ramming process by the ramming energy will achieve the discharge of gas in the soil and the increase of pore water pressure; Soil liquefaction or soil structure destruction; the development of soil cracks occurs, which changes the permeability coefficient of the soil. As the pore pressure dissipates after ramming, the strength of the soil increases, and thixotropy recovers to achieve consolidation and compaction. [0003]...

AI Technical Summary

Problems solved by technology

However, its high cost and slow work efficiency cannot be applied to large-scale promotion and application

[0006] In order to achieve the purpose of deep reinforcement of soft soil, engineers and technicians use deep blasting, backfill building materials after blasting, and then use dynamic compaction technology. The final result is that the deep soft soil is replaced, but the problem of deep reinforcement cannot be solved.

[0007] The effective reinforcement depth of dynamic compaction has always been the main problem of deep reinforcement of soft soil foundations. Engineers and technicians put steel pipes into the required depth and carry out dynamic compaction by hanging rammers. According to the experiment, the strength of the soil does not increase much, and the recovery time of the soil is long. For example, the effect of tamping the soil with good soil quality on the backfill site is not obvious. The key is that the water content at the tamping point is too high, which directly affects the strength. The reinforcement effect of tamping

[0008] In summary, the soft soil foundation adopts dynamic compaction technology, and the reinforcement depth is limited; even if high-energy dynamic compaction is used, due to high cost, long construction period, and easy to break the soil; For deep ramming, due to the high groundwater level and soil water content, the strength of the soil after ramming does not increase much, the effect is not obvious, and the recovery time is long

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