Water-rich sand gravel stratum connecting tunnel underground excavation crossing urban main road construction method

A construction method and technology of sand and pebble, applied in drainage, tunnel, tunnel lining and other directions, can solve the problems of poor formation self-stability and high excavation risk, and achieve the effect of fast construction schedule, effective formation subsidence control, and reasonable measures.

Active Publication Date: 2019-12-10
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 stra

Method used

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  • Water-rich sand gravel stratum connecting tunnel underground excavation crossing urban main road construction method

Examples

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Example Embodiment

[0027] Example 1

[0028] Construction of a subway station in a central area of ​​a northern city. The subway station is located in a prosperous part of the city, and it needs to go under the main urban road during construction. There is a cross section at the west end of the interval, which has many types of cross-sections and frequent conversions; and there are many abrupt cross sections, and the excavation contours of the cross-sections differ greatly. Conventional methods cannot complete the conversion of large abrupt cross sections. The maximum cross-section is 15m×12m, and the distance between the two The adjacent standard section is only 2.3m. The main structure of the section is mainly located in the medium-coarse sand layer, silty fine sand layer and pebble-cobble gravel layer. During the initial excavation, the soil is disturbed many times, which will directly affect the settlement of the road and the upper pipeline.

[0029] Therefore, after a multi-party plan is final...

Example Embodiment

[0041] Example 2

[0042] A construction method for crossing urban arterial roads through undercut excavation of a crossover section in a water-rich sand and gravel stratum. Such as figure 1 As shown, the method includes the following steps:

[0043] a. Preparation for construction, and dewatering construction is required before construction, and the water level drops to 0.5-1m below the structural floor. And promptly conduct open drainage treatment of the stagnant water between layers to ensure construction safety;

[0044] b. Perform stratum grouting reinforcement on the surrounding stratum of the crossover section. After the stratum grouting reinforcement is completed, set up temporary steel supports at the crossover section, and then build the arched pipe shed and carry out the pipe shed grouting reinforcement;

[0045] c. Undercut construction of the crossing section, large cross-sections are excavated by the double sidewall pilot method: excavation of the first pilot pit on th...

Example Embodiment

[0066] Example 3

[0067] A construction method for crossing urban arterial roads through undercut excavation of a crossover section in a water-rich sand and gravel stratum. Such as figure 1 As shown, the method includes the following steps:

[0068] a. Preparation for construction, and dewatering construction is required before construction, and the water level drops to 0.5-1m below the structural floor. And promptly conduct open drainage treatment of the stagnant water between layers to ensure construction safety;

[0069] b. Perform stratum grouting reinforcement on the surrounding stratum of the crossover section. After the stratum grouting reinforcement is completed, set up temporary steel supports at the crossover section, and then build the arched pipe shed and carry out the pipe shed grouting reinforcement;

[0070] c. Undercut construction of the crossing section, large cross-sections are excavated by the double sidewall pilot method: excavation of the first pilot pit on th...

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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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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
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