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Construction method for undercrossing of urban shallow tunnel through soft-flow plastic red clay layer

A technology for shallow buried tunnels and construction methods, which is applied in tunnels, tunnel linings, and earthwork drilling and mining, etc., can solve the problems of road safety, quality, and progress of urban pipeline network in construction safety, and achieve strong construction operability and operation. Simple, low grouting pressure

Active Publication Date: 2018-07-06
RANKEN RAILWAY CONSTR GROUP
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the traditional tunnel construction operation is adopted in the red clay layer, and the construction safety, urban pipe network road safety, quality, and progress cannot be guaranteed. The red clay layer construction method can effectively realize the low-pressure grouting processing operation of the soft and plastic red clay layer, ensure construction safety, urban pipe network road safety, and speed up the construction progress

Method used

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  • Construction method for undercrossing of urban shallow tunnel through soft-flow plastic red clay layer
  • Construction method for undercrossing of urban shallow tunnel through soft-flow plastic red clay layer
  • Construction method for undercrossing of urban shallow tunnel through soft-flow plastic red clay layer

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Embodiment 1

[0044] like figure 1 As shown, the invention provides a kind of construction method of soft flow plastic red clay layer under a kind of urban shallow buried tunnel, and concrete steps are successively:

[0045] Step 1. Use geological radar scanning, advanced horizontal drilling and infrared water detection to detect the distribution of red clay in front of the tunnel and the water outlet, and adjust the grouting parameters according to the detection results to avoid blind grouting. For example, figure 2 and image 3 shown;

[0046] Step 2, build a simple grout-stop wall: for the convenience of construction, the reinforcement mesh is used to spray 500mm thick C25 concrete for the construction of the grout-stop wall, and at the same time, the anchor bars are implemented in the ring direction of the initial branch of the tunnel face, and are connected with the steel mesh as a whole , to increase its stress characteristics. The steel mesh adopts φ8@150×150 single-layer mesh, a...

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Abstract

The invention discloses a construction method for undercrossing of an urban shallow tunnel through a soft-flow plastic red clay layer. The construction method comprises the following steps that 1, a simple grout-preventing wall is built, concrete is sprayed through a reinforcing mesh, and meanwhile annular implemented anchor bars are preliminarily erected on a tunnel face and connected with the reinforcing mesh into a whole; and 2, retrograde grouting is conducted, specifically, a down-the-hole drill drills in the tunnel face to drill forwards till the preset depth is reached, grouting work isconducted through a hollow drill rod, meanwhile the drill rod rotates and retreats, and the grouting pressure is controlled to be 0.5-1 Mpa. According to the construction method, low-pressure grouting processing operation of the soft-flow plastic red clay layer can be effectively achieved, the construction safety and urban pipe network road safety are guaranteed, and the construction schedule isaccelerated.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a construction method for urban shallow-buried tunnels passing through soft-flow plastic red clay layers. Background technique [0002] Red clay is different from other cohesive soils because of its characteristics of high water stagnation, sudden change, hard top and soft bottom, and poor permeability. This increases the difficulty of construction, especially when the tunnel passes through the soft-flow plastic red clay layer. If it is not treated properly, it is easy to cause safety risks such as ground subsidence and collapse. Conventional construction methods for treating such surrounding rocks during tunnel construction include advance small conduit grouting, full-section grouting, reinforcement of large (medium) pipe sheds, and just inserted plates. However, due to the special physical properties of soft flow plastic red clay Such conventional m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/15E21D11/10E21D11/14E21D20/00
CPCE21D9/001E21D9/002E21D11/10E21D11/14E21D11/152E21D20/00
Inventor 郑文昌曹苏亚张星
Owner RANKEN RAILWAY CONSTR GROUP
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