Anti-slide pile and frame arch combined structure and construction method

A technology of combined structure and construction method, which is applied in the direction of earth drilling, mining equipment, tunnels, etc., can solve the problems of high cost of slope reinforcement on both sides, destruction of geological bodies and ecology, and failure to achieve safe entry into the tunnel, etc., to achieve reinforcement The effects of preventing tunnel arch collapse, ensuring stability and ecology, and saving reinforcement costs

Inactive Publication Date: 2012-05-09
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the stability of the slopes on both sides of the ditch center is poor or poor and the excavation disturbance may induce large-scale landslides, this method requires too high pre-reinforcement costs or even fails to achieve the effect of safe tunneling.
Moreover, when the surrounding rock level of the tunnel is poor, the excavation of the tunnel will cause the disturbance of the overlying soil layer and the slope, and when the slope slope an

Method used

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  • Anti-slide pile and frame arch combined structure and construction method
  • Anti-slide pile and frame arch combined structure and construction method
  • Anti-slide pile and frame arch combined structure and construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1, such as figure 1 and Figure 9 As shown, the anti-slide pile frame-arch combination structure in the present invention is used to reinforce the slopes on both sides of the tunnel entrance section and the overlying rock and soil mass in the trench center terrain, including anti-slide piles 1 and frame arches 6, which are suitable for Under the topography of the ditch center, when the overlying soil layer on the tunnel arch is greater than 5m, the stability of the side slopes on both sides is poor or the tunnel opening is poor. The anti-sliding pile 1 adopts on-site pouring of reinforced concrete, which goes deep into the stable bedrock 8 and exposes a small amount of the original surface (about 0.5-1m), and is arranged on both sides of the tunnel body. Pressure reinforcement of the slopes on both sides of the tunnel entrance. The depth, cross-sectional size, and reinforcement strength of the anti-slide pile 1 to stabilize the bedrock 8 need to be determined ...

Embodiment 2

[0036] Example 2, such as figure 2 , image 3 , Figure 4 to Figure 8 As shown, what its frame arch 6 adopts is arch beam arrangement. The difference from Example 1 is that when the thickness of the overlying soil layer 10 of the tunnel is less than 5m, the protective arch 2 needs to be constructed. The protective arch 2 adopts the steel concrete structure commonly used at the tunnel entrance. The conditions are determined. The guard arch 2 is a continuous arch structure, and is connected with the anti-slide pile 1 by connecting steel plates 13 and bolts 15 through the I-beam 11 pre-embedded in the body of the anti-slide pile 1 . The implementation sequence is to carry out the construction of the anti-slide pile 1 first, then excavate the overlying soil and the construction of the arch protection 2, then backfill the soil layer and construct the arch 6, and wait for the concrete of the anti-slide pile 1, protection arch 2 and arch 6 After the structure is completely solid...

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Abstract

The invention discloses an anti-slide pile and frame arch combined structure and a construction method. The combined structure comprises anti-slide piles (1) arranged on two sides of a tunnel body in an embedded mode, and the anti-slide piles (1) extend to a stable base rock (8); a frame arch (6) is connected with the anti-slide piles (1) on the two sides; a guard arch (2) connected with I steels (11) of the pile bodies of the anti-slide piles (1) on the two sides is arranged above a tunnel arch ring (3); and the guard arch (2) is provided with a backfilled soil rock layer (5) in back of the piles. The combined structure is suitable for a pre-supporting reinforcement structure of a tunnel portal under a ditch heart terrain when thin soil is covered on the tunnel and the stability of slopes of two sides is poor or relatively poor; by a mode of combining the anti-slide piles, the frame arch and the guard arch into a whole, the stress performance of the anti-slide piles is greatly improved; and the slopes of the two sides of the ditch heart tunnel portal and the covered soil layer are integrally reinforced, so that digging and reinforcement of the slopes of the two sides of the ditch heart are reduced, stability and ecology of the original slopes are ensured, the reinforcing cost of the slopes of the two sides is saved, and the construction is simple.

Description

technical field [0001] The invention relates to a retaining reinforcement structure and a construction method of a tunnel entrance section. Background technique [0002] With the large-scale construction of traffic lines in our country, especially expressway and railway projects, we are faced with the construction of a large number of tunnel projects in mountainous areas. There are a large number of tunnel entrances in the center of the valley in mountainous areas. Since the center of the ditch is generally loose accumulation of rock and soil, the important issues for safe entry of tunnels under this terrain are: the impact of tunnel excavation on the stability of the slopes on both sides of the ditch center and the collapse of the overlying soil layer. [0003] At present, the tunnel entrance method with poor stability of the slopes on both sides of the ditch center adopts a separate reinforcement method: first, the slopes on both sides are reinforced by conventional metho...

Claims

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Application Information

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IPC IPC(8): E21D9/14
Inventor 黄达杨超张永兴岑夺丰
Owner CHONGQING UNIV
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