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Two-stair five-step excavation construction method for shallow-buried large-span soft plastic clay tunnel

A construction method and step excavation technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of long closing time of inverted arches, frequent disturbances of surrounding rocks, and slow construction progress, so as to improve the tunnel transportation environment , reduce operating diseases, and have a large construction space

Active Publication Date: 2011-05-04
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP NO 4 ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing soft ground tunnel excavation technology, such as many procedures, slow construction progress, high cost, many disturbances to the surrounding

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0023] Specific implementation mode one: the steps of the construction method of the two-step five-step excavation of the shallow-buried large-span soft plastic clay tunnel of the present embodiment are as follows:

[0024] Step 1. Excavate on the steps and reserve the core soil:

[0025] When excavating, use an excavator to excavate with manual pneumatic picks or electric picks. When the excavator excavates, reserve 50cm of soil along the contour line, and then use artificial pneumatic picks or electric picks to excavate. Set up an enlarged arch foot, and leave at least 20cm deep soil at the bottom of the arch foot for manual excavation;

[0026] Step 2, support on the steps:

[0027] When there is water seepage, the excavation surface shall be sealed with primary shotcrete, and then the arch pads shall be set up, and the profiled steel arch frame shall be erected, and the connecting steel bars shall be staggered and welded on the inner and outer edges of the I-beams longitu...

specific Embodiment approach 2

[0035] Specific embodiment two: In the second step of this embodiment, the longitudinal connection reinforcement between two adjacent I-beams is welded in a double-direction straight hook shape on the inner and outer edges of the I-beams. stable structure. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: In step 2 of this embodiment, the overlapping length of the reinforcement mesh pieces is greater than 30 times the diameter of the reinforcement. stable structure. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a two-stair five-step excavation construction method for a shallow-buried large-span soft plastic clay tunnel, relates to an excavation construction method for the shallow-buried large-span soft plastic clay tunnel and aims to solve the problems of a large number of working procedures, slow construction process, high cost, frequent disturbance of surrounding rock, large surrounding rock deformation and long inverted arch enclosing time existing in the conventional excavation technology for a soft ground tunnel. The method comprises the following steps of: excavating anupper bench and preserving core soil, namely preserving a soil body along a contour line while excavating by using an excavator, excavating and arranging an expanded arch springing at the position ofthe arch springing; supporting the upper bench, namely enclosing an excavation surface by primarily spraying concrete, arranging an arch springing support cushion, erecting a profile steel lagging jack, laying steel bar net slices, constructing a locking foot anchor pipe and ejecting concrete to designed thickness; excavating and supporting a lower bench in a staggered way, namely excavating leftand right parts in a staggered way, tightly connecting a section steel frame of a side wall with an arch steel frame, constructing a reinforcing mesh and a foot locking anchor pipe and ejecting concrete; excavating core soil; and excavating and supporting an inverted arch. The method is suitable for construction of the shallow-buried large-span soft plastic clay tunnel.

Description

technical field [0001] The invention relates to a construction method for excavating a shallow-buried large-span soft plastic clay tunnel, in particular to a construction method for excavating a shallow-buried large-span soft plastic clay tunnel with two steps and five steps, and belongs to the technical field of civil engineering. Background technique [0002] Soft plastic clay surrounding rock has the characteristics of low foundation bearing capacity, high water content, poor cohesive force, and easy collapse. When building tunnels in soft ground in my country, the CD method, CRD method and double-side wall guide method are mainly used for surrounding rocks of V and VI grades. Pit method and other construction methods, this type of construction method can well control the surface settlement and deformation convergence, but there are many processes, and all of them are manual or small-scale mechanical operations. Large-scale machinery cannot be deployed, and the construction...

Claims

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Application Information

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IPC IPC(8): E21D9/04E21D11/14E21D11/18
Inventor 胡利平盖青山白国艳
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP NO 4 ENG
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