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Open cut tunnel and tunnel bottom pile raft structure passing through half-filled karst cave

A slab structure and karst cave technology, applied in tunnels, tunnel linings, shaft equipment, etc., can solve problems such as the impossibility of fully revealing karst caves, and achieve the effects of ensuring tunnel construction and operation safety, saving engineering investment, and ensuring safety

Pending Publication Date: 2019-03-19
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the geology of the southwestern mountainous area is complex, and there are many karst developments. It is impossible to completely avoid the karst area in the route selection. Due to the design cost and precision control, even if the geological drilling holes are drilled at certain intervals, it is impossible to fully reveal the karst caves that the route passes through. , the cave can only be dealt with specially after the construction reveals the cave

Method used

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  • Open cut tunnel and tunnel bottom pile raft structure passing through half-filled karst cave
  • Open cut tunnel and tunnel bottom pile raft structure passing through half-filled karst cave

Examples

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Effect test

Embodiment 1

[0032] Such as Figure 1-Figure 2 As shown, the large semi-filled cave includes an upper empty cave 11 and a lower filled cave 12, and there is a boundary line 21 between the empty cave and the filled cave. When the tunnel passes through a large semi-filled karst cave, the present invention provides an open cave and tunnel bottom pile raft structure passing through the semi-filled karst cave. And the raft 15, and the open hole 18 and the guard arch 19 for passing through the upper empty karst cave 11, the open hole 18 and the guard arch 19 are located on the raft 15. A left retaining wall 16a and a right retaining wall 16b are respectively arranged on both sides of the pile foundation and the retaining arch 19 to form a stable construction space for the tunnel bottom structure and the open tunnel structure.

[0033] When the pile foundation 13 passes through the lower filling karst cave 12, the depth of embedding in the bedrock at the bottom is greater than or equal to 2m. Ac...

Embodiment 2

[0038] A construction method for an open cave and tunnel bottom pile raft structure passing through a semi-filled karst cave, comprising the following steps:

[0039] Step 1: Determine the scope of the open hole 18 and the pile foundation 13, and construct the left retaining wall 16a and the right retaining wall 16b. make space;

[0040] Step 2: Construct the pile foundation 13 for passing through the lower filled karst cave 12, wherein the pile foundation 13 is embedded in the bedrock at the bottom to a depth greater than or equal to 2m, and the pile foundation 13 is arranged at intervals horizontally and vertically according to the span of the tunnel and the scope of the karst cave , pile foundation 13 adopts bored pile;

[0041] Step 3: constructing a concrete grout-stopping board 14 on the top of the pile foundation 13, wherein the thickness of the grout-stopping board 14 is greater than or equal to 50 cm;

[0042]Step 4: Construction of the reinforcement of the raft 15,...

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Abstract

The invention discloses an open cut tunnel and tunnel bottom pile raft structure passing through a half-filled karst cave. The open cut tunnel and tunnel bottom pile raft structure includes a pile foundation, a slurry stopping plate and a raft which are used for passing through a lower filling karst cave, and an open cut tunnel and a arch back haunch fillet which are both used for passing throughan upper empty karst cave. The open cut tunnel and the arch back haunch fillet are located above the raft. The invention further discloses a construction method thereof. The construction method includes determining a range of the open cut tunnel and the pile foundation, and constructing a left side baffle and a right side baffle; constructing the pile foundation for passing through the lower filling karst cave; constructing the concrete slurry stopping plate at the top of the pile foundation; constructing steel bars of the raft, connecting the raft and the pile foundation to the steel bars, and placing the raft and the pile foundation at the top of the pile foundation, and finally pouring concrete of the raft; constructing a left side arch back haunch fillet enlarging foundation and a right side arch back haunch fillet enlarging foundation on the raft, and constructing the arch back haunch fillet; constructing the open cut tunnel after the arch back haunch fillet construction; after the arch back haunch fillet and the arch back haunch fillet reach the structural design strength, perform backfill of earth and stone on the two sides and the top of the arch back haunch fillet and performing compact ramming, and performing concrete backfill on the two sides of the enlarging foundations; and constructing drain holes on the two sides of the tunnel.

Description

technical field [0001] The invention relates to the technical field of railway engineering construction, in particular to an open cave and tunnel bottom pile raft structure passing through a semi-filled karst cave. Background technique [0002] In the southwestern mountainous area, the construction of railways can drive local economic development along the line and has important social and economic value. However, the geology of the southwestern mountainous area is complex, and there are many karst developments. It is impossible to completely avoid the karst area in the route selection. Due to the control of design cost and precision, even if the geological drilling holes are drilled at certain intervals, it is impossible to fully reveal the karst caves that the route crosses. Therefore, the cave can only be dealt with specially after the construction reveals the cave. The key to the treatment of karst caves is to ensure the safety of the structure during the construction a...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21F16/02
CPCE21D11/003E21D11/105E21F16/02
Inventor 舒东利周林峰余大龙王磊朱麟晨王佳康芮宋洋廖余
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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