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Foundation treatment method for exactly regulating foundation settlement, and construction device

A foundation settlement and foundation treatment technology, which is applied in infrastructure engineering, soil protection, roads, etc., can solve problems such as difficulty in accurately controlling the amount of settlement in the working principle, high engineering cost, difficulty in obtaining safe and economical engineering effects, etc., to achieve The effects of accurate control of foundation settlement, simple construction equipment, and simple construction methods

Inactive Publication Date: 2011-12-28
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, foundation treatment methods such as concrete piles and cement-soil piles, which are often expensive, have to be used.
However, even with this high-cost foundation treatment method, it is difficult to accurately control the settlement from its working principle and design method
Therefore, it is difficult to obtain safe and economical engineering effects

Method used

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  • Foundation treatment method for exactly regulating foundation settlement, and construction device
  • Foundation treatment method for exactly regulating foundation settlement, and construction device
  • Foundation treatment method for exactly regulating foundation settlement, and construction device

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A road widening project, according to the engineering survey report: the soil layer within 5 meters depth of the project site is flow-plastic muddy clay, and the soil beneath it is hard. The porosity of the subgrade that needs to be widened is 0.9; the foundation under the old road has been drained and consolidated under the road load and vehicle operating load, and the porosity is 0.6. The extruder is made of aluminum alloy and adopts an oblique expansion extruder. The permeable filter membrane Y is a polymer fiber woven cloth, such as Figure 2a , 2b , the extended blade B has a permeable hole structure. The diameter of the expander is 150mm in the contracted state, and the maximum diameter after expansion is 350mm, and the length of the expander is 6m. The distance between the extruders is set to 1m, and the extruders in the shrinking state are pressed into the soil by static pressure. Rotate the central screw I of the extruder to expand the extruder to a diameter...

Embodiment 2

[0045] For a highway widening project, according to the engineering survey report, it can be known that the soil layer within 3 meters of the widened subgrade site is a soft plastic filling layer, and the 10m soil layer below it is a muddy soil layer. The porosity within 3m of the foundation of the road section that needs to be widened is 0.8, and the porosity of the mud layer below 3m is 1.0; the porosity of the old roadbed within 3m of the depth is 0.6, and the porosity of the mud layer below 3m gradually changes from 0.65 to 0.8 at 13m. The extruder is made of high-strength stainless steel, and a variable cross-section combined extruder is used. The permeable filter membrane is made of inorganic non-metallic fiber woven cloth, such as Figure 4 . The variable cross-section combined expander is a pile hole expander with double trapezoidal enlarged heads, which is composed of an I-type expander unit and two obliquely expanded expanders. The oblique expansion type extruder is...

Embodiment 3

[0047] A roadbed and pavement repair project, after a period of operation of the road, due to the excessive settlement of local foundations, some sections of the road have subsidence and the road surface has been damaged. Since only the foundation of some road sections has problems, it is only necessary to repair the foundation of the damaged road section without destroying the overall structure of the road. According to the engineering investigation report, the porosity of the soil layer under the subgrade of normal roads is 0.6, and the porosity of the soil layer under the subgrade of subsidence road sections is 0.75. The foundation of subsidence section is compacted with expander to make the porosity close to the foundation porosity of the section in normal use, so as to realize the restoration of subsidence section. The extruder is made of low-alloy carbon steel. It adopts a direct expansion extruder composed of two I-type extruder units and a II-type extruder unit. The pe...

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Abstract

The present invention discloses a foundation treatment method for exactly regulating foundation settlement, and a construction device, and belongs to the technical field of civil engineering. According to the method, the number of squeezing expanding apparatuses and the amount of diameter expansion are determined according to settlement prediction of the foundation to be eliminated; with gradual expansions of the squeezing and expanding apparatuses in the soil according to the specified rates, horizontal loads are applied on the surrounding soil, such that the soil is forced to be subjected to drainage consolidation, the porosity is reduced until the pore reduction meet the design target value so as to realize a purpose of exact regulation of the foundation settlement. The construction device is the squeezing and expanding apparatus. The squeezing and expanding apparatus comprises at least an II type squeezing and expanding apparatus unit, which can form an oblique extension type diameter-variable pile pore after expanding. According to the present invention, with diameter-variable squeezing and expanding, according to the preset target, the pores in the foundation are exactly andquantitatively eliminated so as to achieve the purpose of exact regulation of the foundation settlement prediction; for the road widening project, the settlement difference between the old road foundation and the new road foundation can be exactly controlled; the construction device is convenient, the construction method is simple and the cost is low.

Description

technical field [0001] The invention relates to a foundation treatment method, which belongs to the technical field of civil engineering. Specifically, it refers to a foundation treatment method and a construction device thereof that can accurately control foundation settlement. technical background [0002] At present, our country is in the peak period of highway widening project, which brings new problems of road foundation treatment. The old highway has been used for many years, and its foundation has been consolidated under the action of the subgrade pavement load and vehicle operating load, and the settlement has been stable; while the subgrade and pavement construction of the new widened road is completed, under the action of the self-weight of the subgrade pavement and the vehicle operating load, The foundation will still have a considerable amount of settlement; thus causing differential settlement of the new and old roads, which in turn will cause damage to the pav...

Claims

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Application Information

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IPC IPC(8): E01C3/04E02D3/08E02D3/10
Inventor 朱宝林田雨于浩程寅黄新
Owner BEIHANG UNIV
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