Deep and thick soft soil deep foundation pit soft soil body pre-reinforcement method

A deep foundation pit and soft soil technology, applied in excavation, soil protection, infrastructure engineering, etc., can solve the problems of uncontrollable upper soft soil deformation and increase construction risks, saving materials, construction time, construction methods, etc. Easy to operate and save construction materials

Active Publication Date: 2022-01-04
WUHAN MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a method for pre-reinforcement of weak soil in deep soft soil and deep foundation pit, which is relatively thick for the upper soft soil The inner side of the foundation pit is reinforced to solve the problem that the reinforcement of the bottom of the foundation pit cannot control the deformation of the upper soft soil and increase the construction risk

Method used

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  • Deep and thick soft soil deep foundation pit soft soil body pre-reinforcement method
  • Deep and thick soft soil deep foundation pit soft soil body pre-reinforcement method
  • Deep and thick soft soil deep foundation pit soft soil body pre-reinforcement method

Examples

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Effect test

Embodiment 1

[0042] see figure 1 with figure 2 , the present embodiment adopts the triple tube method high-pressure rotary grouting piles to pre-reinforce the weak soil inside the rectangular deep foundation pit 2, and the reinforced body 1 is composed of a plurality of pile bodies 4, and its structure is a solid belly type. The specific construction method is as follows:

[0043] First construct the foundation pit support structure 6, and then reinforce the soil inside the foundation pit. Pile body 4 adopts triple tube method high-pressure rotary grouting pile, the strength grade of ordinary Portland cement used is 32.5MPa, the water-cement ratio is 0.8, and the amount of cement added to the rotary grouting pile per cubic meter is 450kg; the pile diameter is 0.8m, Arranged in a square, the vertical and horizontal pile spacing is 0.6m, and the interlocking is 0.2m. First construct a single reinforced pile body 4, and then move the construction equipment according to the design spacing ...

Embodiment 2

[0045] see figure 1 with image 3 , the present embodiment uses cement-soil mixing piles to pre-reinforce the weak soil inside the circular deep foundation pit 2, and the reinforced body 1 is composed of a plurality of pile bodies 4, and its structure is a solid belly type. The specific construction method is as follows:

[0046] First construct the foundation pit support structure 6, and then reinforce the soil inside the foundation pit. Pile body 4 is a cement-soil mixing pile, the ordinary portland cement strength grade used is 32.5MPa, the water-cement ratio is 0.50, and the amount of cement in the mixing pile per cubic meter is 270kg; The vertical and vertical pile spacings are both 0.4m, and the occlusion is 0.2m. First construct a single reinforced pile body 4, and then move the construction equipment according to the design spacing requirements, construct adjacent pile bodies 4, and construct sequentially along the longitudinal (or horizontal) direction. After cons...

Embodiment 3

[0048] see figure 1 with Figure 4 In this embodiment, MJS construction method piles are used to pre-reinforce the weak soil inside the rectangular deep foundation pit 2, and the reinforced body 1 is composed of a plurality of pile bodies 4, and its structure is a partial displacement type. The specific construction method is as follows:

[0049] First construct the foundation pit support structure 6, and then reinforce the soil inside the foundation pit. Pile body 4 adopts MJS construction method piles, the strength grade of ordinary Portland cement used is 32.5MPa, and the cement mixing amount in each cubic meter of MJS construction method piles is 500kg. The outer side of reinforcement body 1 adopts two rows of continuous interlocking arrangement, the pile diameter is 1m, arranged in a square, the longitudinal and transverse pile spacing is 0.8m, and the interlocking is 0.2m. First construct a single reinforced pile body 4, and then move the construction equipment accord...

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Abstract

The invention belongs to the technical field of deep foundation pit construction, and particularly discloses a deep and thick soft soil deep foundation pit soft soil body pre-reinforcement method. The method comprises the steps that a foundation pit supporting structure is constructed firstly, then soft soil body in a deep foundation pit is subjected to pre-reinforcement treatment to form a reinforcement body, the side face of the reinforcement body is tightly attached to the foundation pit supporting structure, the top of the reinforcement body is close to the ground, and the thickness of the reinforcing body is smaller than or equal to the thickness of the soft soil body above the excavation face of the deep foundation pit. According to the method, soft soil layers such as upper sludge and mucky soil in the foundation pit are subjected to pre-reinforcement treatment, the soil body strength is improved, and deformation of the foundation pit supporting structure is effectively controlled, so that the construction safety of the deep and thick soft soil deep foundation pit is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of deep foundation pit construction, and more specifically relates to a method for pre-reinforcement of weak soil in deep foundation pits with deep soft soil. Background technique [0002] As the depth of the foundation pit and the excavation area become larger and affected by factors such as the surrounding environment, the difficulty of foundation pit support becomes more and more difficult. Especially in areas with deep soft soil layers, the support design of deep foundation pits is the key to the smooth construction of foundation pits. For deep foundation pit projects located in deep soft soil areas, when the surrounding environment is complex and the deformation requirements of the foundation pit are high, the conventional method is to increase the cross-section and stiffness of the support structure, reduce the support spacing and increase the support stiffness, but in actual construction It is found ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D17/04E02D5/22
CPCE02D3/00E02D17/04E02D5/22
Inventor 和礼红代昂熊永华彭定新卢方伟胡云华余敦猛蔡清郭开王翔宇
Owner WUHAN MUNICIPAL ENG DESIGN & RES INST
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