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Directional isolation deep soil displacement high-pressure air column pile and construction method

A technology of high-pressure gas and deep soil, which is applied in the direction of foundation structure engineering, on-site foundation soil survey, protection devices, etc., can solve the problems of controlling unfavorable deformation and enlargement of tunnels, and achieve accurate and reasonable unfavorable displacement and the effect of blocking unfavorable displacement

Active Publication Date: 2019-03-12
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is an existing underground tunnel outside the foundation pit and the tunnel happens to be within this range, the horizontal displacement of the tunnel may be increased due to the "traction effect" of the isolation piles, which is not good for controlling the deformation of the tunnel.

Method used

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  • Directional isolation deep soil displacement high-pressure air column pile and construction method
  • Directional isolation deep soil displacement high-pressure air column pile and construction method
  • Directional isolation deep soil displacement high-pressure air column pile and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The first is the design of the high-pressure air column 1, which mainly includes the A-side high-pressure airbag 2, the B-side high-pressure airbag 3, the middle partition 4 and the upper and lower connection plates 12. An earth pressure sensor 8 is installed on the outside of the high-pressure airbag, and a displacement gauge 7 is installed inside the high-pressure airbag 2 on the A side. The B-side high-pressure airbag 3 has the same structure as the A-side high-pressure airbag 2 and is separated by a middle partition 4 . A pipeline passage 5 is arranged in the middle partition 4 , and the inflation tube in the high-pressure air bag enters the pipeline passage 5 through the air pipe opening 6 , and an air pipe joint 13 is provided on the top of the connecting plate 12 . Bolt holes 9 and sealing rubber rings 11 are left on the connection plate 12, and each section of high-pressure gas column 1 can be connected together by bolts 10. The sealing rubber ring 11 can preven...

Embodiment 2

[0041] The construction method of the directional isolation deep soil displacement high-pressure air column pile comprises the following steps:

[0042] 1. According to the distance between the underground structure to be protected and the periphery of the foundation pit, determine the position where the high-pressure gas column pile needs to be set up and the corresponding layout method of the high-pressure gas column pile. Double-row dislocation arrangement or plum blossom arrangement can be adopted.

[0043] 2. Before excavating the foundation pit, determine the depth of the required drilling according to the depth of the ground connection wall or the depth of the protected underground structure, and then the drilling machine is in place to start drilling.

[0044] 3. After the drilling is completed, start to lower the high-pressure gas column 1 immediately. After lowering one section, connect the hole with the next section through bolts until the requirements are met. Afte...

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Abstract

The invention relates to a directional isolation deep soil displacement high-pressure air column pile which comprises a high-pressure air column, a system operation box and an air compressor. The high-pressure air column comprises an A-side high-pressure airbag, a B-side high-pressure airbag, a middle partition plate and connecting discs. The connecting discs are arranged at the upper end and thelower end of the high-pressure air column, and the segments of the high-pressure air column are connected through the connecting discs. The A-side high-pressure airbag and the B-side high-pressure airbag are the same in structure and are separated by the middle partition plate, a soil pressure sensor is mounted on the outer side of the B-side high-pressure airbag, and a displacement meter is mounted in the A-side high-pressure airbag. A pipeline channel is arranged in the middle partition plate. An air inflation pipe in the high-pressure airbags enters the pipeline channel through an air pipeopening, and an air pipe joint is arranged at the top of the connecting disc at the upper end. The directional isolation deep soil displacement high-pressure air column pile has the beneficial effectsthat the high-pressure airbags are adopted for providing pressure and displacement, and deep soil displacement caused by foundation pit excavation can be eliminated in real time through an automaticsystem; and the device can be used repeatedly and is relatively economical and environment-friendly, and meanwhile normal construction of a foundation pit cannot be influenced.

Description

technical field [0001] The invention relates to a directionally isolated deep soil displacement high-pressure air column pile and a construction method thereof, which belong to the field of environmental protection around foundation pits. Background technique [0002] With the process of urbanization, there are more and more urban underground projects, coupled with the shortage of urban land, the environmental conditions around the foundation pit are becoming more and more complex, and the deformation control standards for the impact of foundation pits on the surrounding environment are becoming increasingly strict . The control technology of the passive zone currently adopted generally includes measures such as soil reinforcement in the foundation pit, excavation of the foundation pit in sections, and increasing the rigidity of the enclosure structure. However, these measures will significantly increase the cost and prolong the construction period. At the same time, they l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/08E02D1/08
CPCE02D1/08E02D31/08E02D2300/0001Y02E10/10
Inventor 刘干斌郑明飞叶俊能周晔熊勇林黄强
Owner NINGBO UNIV
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