Tunnel excavation construction method

A technology of tunnel excavation and construction method, which is applied to tunnels, tunnel linings, shaft linings, etc. It can solve problems such as large headroom, small working face, and restrictions on construction progress, and achieve the effects of ensuring safety, good support, and increasing the speed of entering the tunnel

Active Publication Date: 2019-01-01
江苏华设远州交通科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large headroom and small working surface of this construction method, the construction progress is restricted.

Method used

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  • Tunnel excavation construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] like Figure 2-8 Shown, a kind of tunnel excavation method of the present invention comprises the following steps:

[0050] (1) The planned tunnel section is divided into five independent excavation units, which are the first unit 21 on the upper left, the second unit 22 on the upper right, the third unit 23 between the first unit 21 and the second unit 22, and the lower left unit The fourth unit 24 and the fifth unit 25 on the lower right, the first unit 21 and the second unit 22 are separated by the third unit 23 at least in the lower part.

[0051] In this embodiment, specifically, such as figure 2 As shown, the first unit 21 and the second unit 22 are completely separated by the third unit 23 .

[0052] (2) if image 3 As shown, advance support 212 is performed on the first unit 21, and then excavated, and then the first initial support 214 on the outside of the first unit 21 and the first temporary support 216 on the inside are installed.

[0053] (3) if Fig...

Embodiment 2

[0062] A kind of tunnel excavation method of the present embodiment, and the difference of embodiment 1 is: as Figure 9 As shown, the third unit 23 is subdivided into an upper unit 231 and a lower unit 233 . During construction, in step (4), the upper unit 231 is excavated first, and then the lower unit 233 is excavated.

[0063] Specifically, when constructing the upper unit 231, such as Figure 10 As shown, advance support 232 is performed first, and then excavation is performed, and then the third initial support 234 on the upper side of the upper unit 231 and the third temporary support 236 on the lower side are set.

[0064] More specifically, the third temporary support 236 is bent upwards, and the included angle γ with the horizontal direction is 25°-35°.

[0065] Such as Figure 11 As shown, the lower unit 233 of the third unit 23 is excavated at a distance c from the rear upper unit 231, and c=6m-10m.

Embodiment 3

[0067] Such as Figure 12-15 As shown, the tunnel excavation method of this embodiment differs from that of Embodiment 1 in that: the upper parts of the first unit 21 and the second unit 22 are connected together, and only the lower part is separated by the third unit 23 . The top surface of the third unit 23 is bent downwards, the two ends are bent symmetrically, and the included angle β with the horizontal direction is 45°-60°.

[0068] Wherein step (2) carries out advance support 212 to the first unit 21, and then excavates, and then sets the first initial support 214 on the outside of the first unit 21 and the first temporary support 216 on the inside, as Figure 13 shown. Step (3) Carry out advanced support 222 on the second unit 22, and then excavate, and then set the second initial support 224 on the outside of the second unit 22 and the second temporary support 226 on the inside, as Figure 14 shown. In step (4), only the third unit 23 needs to be excavated.

[006...

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Abstract

The invention discloses a tunnel excavation construction method. The tunnel excavation construction method comprises the steps that (1) the section of a tunnel is provided with a first unit on the upper left portion, a second unit on the upper right portion, a third unit between the first unit and the second unit, a fourth unit on the lower left portion, and a fifth unit on the lower right portion, and at least the lower portions of the first unit and the second unit are partitioned by the third unit; (2) the first unit, the second unit and the third unit are sequentially excavated; and (5) excavation of the fourth unit, construction of a left side inverted arch, excavation of the fifth unit and construction of a right side inverted arch are sequentially conducted. The tunnel excavation construction method comprises construction of the five independent excavation units, when the first unit and the second unit are constructed, the third unit in the middle can maintain stability better,thus construction of the first unit and the second unit can be relatively accelerated, and meanwhile, safety is ensured.

Description

technical field [0001] The invention relates to a tunnel excavation method. Background technique [0002] Most of the current tunnel construction adopts the CD method for excavation. The CD method is also called the partition wall method. In the large-span tunnel with weak surrounding rock, one side of the tunnel is excavated in parts, and the partition wall is constructed, and then the other side is excavated in parts. One side construction method. Specifically, the excavation and initial support of this method are usually divided into 6 steps, that is, 6 pilot holes, such as figure 1 As shown, the upper and lower left pilot tunnels are the first pilot tunnel 11 and the second pilot tunnel 12 excavated earlier, the left tunnel bottom is the third pilot tunnel 13, and the right side is the fourth pilot tunnel 14 in the order of top and bottom. , the fifth pilot tunnel 15, the bottom of the right tunnel is the sixth pilot tunnel 16. However, due to the large headroom and s...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/00
CPCE21D9/00E21D11/00
Inventor 葛志华唐冲陶忠海陈金林
Owner 江苏华设远州交通科技有限公司
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