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A construction method for underground excavation of crossing section in water-rich sand and pebble stratum to cross urban main road

A construction method, sand and pebble technology, applied in drainage, tunnel, tunnel lining, etc., can solve the problems of high excavation risk, poor ground self-stability, etc., and achieve the effect of effective control of ground settlement, fast construction period and reasonable measures

Active Publication Date: 2020-06-30
BEIJING NO 4 MUNICIPAL CONSTR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention belongs to the rail transit equipment industry. The method overcomes the problems of loose water-rich sand and pebble stratum structure, poor stratum self-stability, and high excavation risk, and strictly guarantees construction quality while ensuring safety.

Method used

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  • A construction method for underground excavation of crossing section in water-rich sand and pebble stratum to cross urban main road

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Effect test

Embodiment 1

[0028] Subway station construction in the central area of ​​a certain northern city. The subway station is located in the bustling area of ​​the city, and it needs to pass through the main road of the city when it is built. There is a crossing section at the west end of this interval, with many types of sections and frequent transitions; moreover, there are many sudden changes, and the excavation profiles of the sections are greatly different. The adjacent standard section is only 2.3m. The main structure of the interval is mainly located in the medium-coarse sand layer, silt-fine sand layer and pebble-round gravel layer. The soil is disturbed many times during the initial excavation, which will directly affect the settlement of the road and the upper pipeline.

[0029] Therefore, it is finally determined through various schemes that the construction method of crossing the line section of the water-rich sand and pebble stratum of the present invention is excavated and crossed...

Embodiment 2

[0042] The invention relates to a construction method for submerged crossing sections of water-rich sand and pebble strata to cross urban arterial roads. like figure 1 As shown, the method includes the following steps:

[0043] a. Construction preparation, and dewatering construction is required before construction, and the water level is lowered to 0.5-1m below the structural floor. And timely carry out open drainage treatment for the stagnant water between layers to ensure construction safety;

[0044] b. Carry out stratum grouting reinforcement to the strata around the crossing section. After the stratum grouting reinforcement is completed, erect temporary steel supports at the crossing section, and then build an arched pipe shed and perform grouting reinforcement on the pipe shed;

[0045] c. Carry out underground excavation construction for the line crossing section, and use the double-side-wall pilot pit method for excavation of the large section: the excavation first ...

Embodiment 3

[0067] The invention relates to a construction method for submerged crossing sections of water-rich sand and pebble strata to cross urban arterial roads. like figure 1 As shown, the method includes the following steps:

[0068] a. Construction preparation, and dewatering construction is required before construction, and the water level is lowered to 0.5-1m below the structural floor. And timely carry out open drainage treatment for the stagnant water between layers to ensure construction safety;

[0069] b. Carry out stratum grouting reinforcement to the strata around the crossing section. After the stratum grouting reinforcement is completed, erect temporary steel supports at the crossing section, and then build an arched pipe shed and perform grouting reinforcement on the pipe shed;

[0070] c. Carry out underground excavation construction for the line crossing section, and use the double-side-wall pilot pit method for excavation of the large section: the excavation first ...

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Abstract

The invention discloses a water-rich sand gravel stratum connecting tunnel underground excavation crossing urban main road construction method. The construction method comprises the following steps ofa, preparing for construction, and performing precipitation construction before construction; b, carrying out stratum grouting reinforcement on the surrounding stratum of the connecting tunnel; c, carrying out underground excavation construction of the connecting tunnel, and excavating a large section by using a double-side-wall pilot pit method; d, performing underground excavation to a middle surface, and converting into a CRD method for excavation by a double-side wall pilot pit method; e, performing underground excavation on a small section, and converting to a step method through a CRD method to excavate. The method overcomes the problems that a water-rich sand gravel stratum is loose in structure, poor in stratum self-stability and large in excavation risk, and the construction quality is strictly ensured under the condition of guaranteeing safety. Meanwhile, different section conversion treatment measures are arranged at the conversion positions of different sections, the connection of all procedures is tight, the settlement deformation control over the whole section is good, the construction period is fast, and the engineering cost is greatly reduced.

Description

technical field [0001] The invention belongs to the rail transit equipment industry, and relates to the technical field of underground structure engineering construction of urban rail transit vehicles, in particular to a construction method for underground excavation of crossing sections of water-rich sand and pebble strata across urban arterial roads. Background technique [0002] With the development and construction of urban underground space, there are more and more projects such as urban underground ring roads, vehicle communication passages, and street crossing tunnels. Situations will be unavoidable. [0003] Subway construction is generally located in a bustling area of ​​the city, and the construction needs to cross the main road of the city. Therefore, ensuring the safety of the main road is the focus of construction, and the requirements for the control of road surface settlement caused by construction are extremely strict. Among them, there are many types of cro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21F16/02E21D11/10E21D11/14E21D11/18
CPCE21D9/00E21D11/10E21D11/14E21D11/18E21F16/02
Inventor 孔恒岳爱敏彭明玉史磊磊迟子利王飞戴建伟王勇张珣
Owner BEIJING NO 4 MUNICIPAL CONSTR ENG