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Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing

The technology of connecting channel and freezing pipe is applied in the construction field of using grouting freezing pipe to reinforce the freezing connecting channel to suppress frost heave and thawing, and can solve the problem of uneven settlement of soft soil layer connecting channel and tunnel structure, insufficient grouting and unsteady grouting. Timely and other issues, to achieve the effect of saving cement usage, enhancing anti-seepage and self-stabilization capabilities, and controlling groundwater seepage

Active Publication Date: 2015-10-07
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It avoids problems such as incomplete and untimely grouting due to unfavorable conditions in the later period, which will cause uneven settlement and cracking of the soft soil stratum connection channel and tunnel structure during operation.

Method used

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  • Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing
  • Construction method for utilizing grouting freezing pipe to reinforce and freeze contact passage to restrain frost heaving and thaw collapsing

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: A kind of grouting freezing pipe

[0037] A subway connection channel in Ningbo, where the geology is from top to bottom, consists of plain fill, silt layer, and silty clay layer. The stratum that the shield tunnels through is mainly silty clay layer. The burial depth of the communication channel is 27.6m, and the reinforcement project adopts the joint reinforcement of cement and soil reinforcement + horizontal freezing method. According to the design requirements, the reinforcement depth of the communication channel is 8.5m.

[0038] 1. A grouting freezing pipe with a length of 8.5m, characterized in that the grouting freezing pipe is composed of a grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I consists of 6 sections, and the end of the first section is installed There is a drill bit III, and a one-way valve IV is arranged on both sides of the pipe body; the liquid supply pipe II is made by cross-welding two steel pipes.

[003...

Embodiment 2

[0041] Embodiment 2: A kind of grouting freezing pipe

[0042] A connecting channel of Suzhou Metro Line 3, the geology of the site is plain fill from top to bottom, silty clay layer, silt-sand interlayer, and silt-fine sand. The stratum traversed by shield tunneling is mainly silt fine sand layer. The communication channel is buried at a depth of 15.2m, and the reinforcement project adopts cement-soil reinforcement + horizontal freezing method for joint reinforcement. According to the design requirements, the reinforcement depth of the communication channel is 4m.

[0043] A grouting freezing pipe with a length of 4m, which is characterized in that the grouting freezing pipe is composed of a grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I is composed of three sections, and the end of the first section is equipped with a drill bit Ⅲ, a one-way valve Ⅳ is arranged on both sides of the pipe body; the liquid supply pipe Ⅱ is made by cross-welding two st...

Embodiment 3

[0046] Embodiment 3: A kind of grouting freezing pipe

[0047] The geology of a communication channel in Ningbo Metro is plain fill, silty clay layer, and silty fine sand layer from top to bottom. The stratum traversed by shield tunneling is mainly silt fine sand layer. The communication channel is buried at a depth of 21.8m, and the reinforcement project adopts cement-soil reinforcement + horizontal freezing method for joint reinforcement. According to the design requirements, the reinforcement depth of the communication channel is 7m.

[0048] A grouting freezing pipe with a length of 7m, which is characterized in that the grouting freezing pipe is composed of a grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I is composed of 5 sections, and the end of the first section is equipped with a drill bit Ⅲ, a one-way valve Ⅳ is arranged on both sides of the pipe body; the liquid supply pipe Ⅱ is made by cross-welding two steel pipes.

[0049] 2. The afore...

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Abstract

The invention relates to a construction method for utilizing a grouting freezing pipe to reinforce and freeze a contact passage to restrain frost heaving and thaw collapsing. A freezing pipe is used as a grouting pipe simultaneously, the grouting freezing pipe is characterized by being composed of the grouting pipe I and a liquid supply pipe II, wherein the grouting pipe I is composed of 3-6 sections, a drill bit III is installed at the pipe end of the first section, and the two sides of a pipe body are each provided with a one-way valve IV; the liquid supply pipe II is formed by two steel pipes in a crossed and welded mode, a certain amount of cement paste is added into and mixed with the soil body to improve physical and mechanical properties of the soil body, and the influence of frost heaving and thaw collapsing on surrounding strata and buildings can be restrained when contact passage freezing reinforcement is conducted. The construction method comprises the steps of construction preparation, positioning and drilling, grouting, liquid supply pipe installation, refrigerating system installation and freezing by starting a machine after maintenance. The construction method has the advantages that the cement soil is utilized for reinforcement, the strength of the soil body is further strengthened, the anti-permeability and the self-stability capacity of the soil body and the water stop performance of the contact passage strata are enhanced, groundwater seepage is effectively controlled, and the safety of later excavation and construction is improved.

Description

technical field [0001] The invention relates to a construction method for using a grouting freezing pipe to reinforce a freezing communication channel and suppress frost heaving and thawing. This method improves the physical and mechanical properties of the soil by adding a certain amount of cement slurry into the soil by using the frozen pipe as the grouting pipe, which can inhibit the impact of frost heaving and thawing on the surrounding strata and buildings (structures) when the connecting channel is frozen and reinforced. impact on buildings. Background technique [0002] Ningbo, Shanghai, Nanjing and other areas near the river and sea have a wide range of soft soil layers with low soil strength and high water content. In the process of underground engineering construction, many problems such as subsidence and water gushing need to be taken into account, among which the reinforcement of communication channels is the key. Both the artificial freezing method and the cem...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D15/04E02D3/115
Inventor 杨平张婷何冬何文龙陈斌丁顺良王升福
Owner NANJING FORESTRY UNIV
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