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Pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method for 4/6 guide-hole PBA construction method

A horizontal and hydraulic technology, applied in infrastructure engineering, protection devices, buildings, etc., can solve problems such as long construction period, low freezing efficiency, and idle work, so as to enhance floating resistance, save costs, and avoid excavation of frozen soil Effect

Active Publication Date: 2018-08-28
BEIJING URBAN CONSTR GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is currently no effective freezing construction method for PBA stations in urban sensitive areas, nor is it combined with the construction of PBA stations. The freezing effect is not ideal, and a closed or semi-closed frozen wall structure cannot be formed. Effectively freeze the construction area, the freezing efficiency is low, the construction period is long, and it is easy to cause idle work due to freezing construction

Method used

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  • Pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method for 4/6 guide-hole PBA construction method
  • Pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method for 4/6 guide-hole PBA construction method
  • Pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method for 4/6 guide-hole PBA construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] See attached Figure 1-4 , a method of pile pipe cooperation with vertical side walls and horizontal bottom-building basin-shaped freezing water-stop construction method for 4 / 6 pilot tunnel PBA construction method, including the following steps:

[0053] (1) Shaft freezing pipe and shaft construction: Construct the shaft freezing pipe, excavate the shaft 1 downward after the shaft freezing structure is formed, and add a waterproof structure to the inner wall of the shaft below the water level.

[0054] For details, see the attached Figure 10 , the construction shaft freezing pipe is: the freezing pipe 14 around the construction shaft from the ground to the design depth, the shaft excavation is carried out downwards, and when the excavation is close to the groundwater level, the construction shaft bottom freezing pipe 15 to the design depth in the shaft, After the shaft freezing structure is formed, the shaft excavation continues downward. The peripheral freezing pip...

Embodiment 2

[0079] See attached Figure 6-9 , different from Example 1, if the groundwater has higher requirements on the thickness of the vertical frozen wall, the integrated construction of the vertical frozen pipe and the support pile will cause the frozen wall to invade the sideline of the pile body and the frozen soil can be excavated. In the area between the adjacent piles outside the pile body and outside the center line of the support pile 10, a separate vertical freezing hole is constructed, and a vertical freezing pipe 4 is inserted in the hole, and the inner edge of the vertical side wall formed by freezing does not exceed the support pile 10. , so that this problem can be avoided. During the specific construction, the frozen holes and the pile holes are drilled alternately, and only a reasonable step distance is staggered. The construction of the supporting piles does not need to wait for the complete formation of the frozen wall, and the two are constructed simultaneously, wi...

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Abstract

The invention discloses a pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method for a 4 / 6 guide-hole PBA construction method. The pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method is effectively integrated with the PBA construction method and mainly comprises the steps of carrying out construction of a vertical shaft, carrying out construction of a transverse channel and upper-layer guide holes, carrying out pile-pipe cooperative construction, carrying out construction of anadditionally-excavated vertical shaft, carrying out construction of an additionally-excavated transverse channel, carrying out construction of a horizontal freezing pipe, carrying out construction ofa freezing network, forming freezing walls and the like. According to the pile-pipe-cooperative vertical-side-wall horizontal-construction-bottom basin-shaped freezing water stop method, a freezing hole and a pile hole are combined into one, or the freezing hole and the pile hole are synchronously constructed, normal construction of a main body structure is not influenced, and the construction efficiency is high, a freezing structure can be effectively formed to isolate the hydraulic connection inside and outside an excavation area, and a water stop purpose can be achieved. The construction method has the advantages that guide holes do not need to be expanded outwards, or antecedent guide holes do not need to be excavated, so that the cost can be saved, the construction period can be shortened, zero extraction of underground water, zero pollution and zero discharge can be realized, the adaptability is strong, construction is flexible, and the method is green and pollution-free and thelike.

Description

technical field [0001] The invention relates to the technical field of excavation and support in deep urban underground spaces, in particular to a freezing and water-stopping process for PBA stations in urban sensitive areas. Background technique [0002] With the development of urban modernization, public transportation can no longer meet the needs relying solely on ground space. The construction of underground railways is the inevitable result of urban development, and it is also a necessary measure to alleviate traffic congestion and encourage public transportation. [0003] Up to now, more than 30 cities in my country have built subways. With the continuous increase of subway mileage, it is also developing in depth. With the gradual increase of the excavation depth, the condition of the soil, the properties of the soil layer, and the stress state are constantly changing, and the groundwater has gradually become an important factor affecting the construction. How to effec...

Claims

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Application Information

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IPC IPC(8): E02D31/02
CPCE02D31/02
Inventor 张晋勋杨昊武福美江玉生邱德隆彭志勇
Owner BEIJING URBAN CONSTR GROUP