Tunnel loose block fracture zone building method

A construction method and technology of crushing zone, applied in tunnels, earthwork drilling, drainage, etc., can solve problems such as endangering construction safety, large water inflow, and long crushing zone, so as to ensure construction progress, ensure construction safety, and avoid loss. The effect of stable deformation

Inactive Publication Date: 2015-09-09
THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps improve planning and decision-making during building projects while reducing negative impacts such as overdesign or underestimating certain factors like soil conditions. It also saves money compared with traditional methods without causing problems due to environmental issues. Overall, this innovation improves efficiency and quality control in constructive works.

Problems solved by technology

This patented problem addressed by this patents relates to controlling the movement or shape change caused during tunneling operations when there're many small cracks that can cause instability issues such as leakages from underground pipes due to subsidence (earthquake) events like earth quakes or explosions. Current methods involve create temporary supports along with concrete blocks used to reinforce around them before they go back into place after being driven over. These techniques have limitations because some areas may still crack open while others remain intact but cannot easily re-construct themselves afterwards without damaging their surroundings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for constructing a tunnel loose massive broken zone proposed by the present invention comprises the following steps:

[0023] S1. Arrange 24 blasting drill holes in the side walls on both sides of the tunnel, with a distance of 1.30m, a hole depth of 1.3m, and a height of 1.2m from the hole to the bottom of the tunnel. The height of the blasthole and the receiver is the same, and the distance between the receiver and the first blasthole is 20m , the depth of the receiver hole is 2.4m, the hole diameter is 38mm, and each blast hole is 25g.

[0024] S2. The advanced horizontal drilling rig drills holes on the face of the tunnel. A total of 6 holes are arranged. Except for the central hole, which is drilled along the tunnel axis, the rest of the holes are drilled outwards. The bottom of the hole is 5.00m beyond the excavation contour line. The overlapping length of the two advanced drilling holes is 9.00m;

[0025] S3. Excavation is carried out by using the ring-sha

Embodiment 2

[0031] The present invention provides a method for constructing a tunnel loose massive broken zone, comprising the following steps:

[0032] S1. Arrange 20 blasting drill holes on the side walls on both sides of the tunnel, with a distance of 2.0m, a hole depth of 0.5m, and a height of 1.50m from the hole to the bottom of the tunnel. , the depth of the receiver hole is 3.0m, the hole diameter is 32mm, and each hole is 40g.

[0033] S2. The advanced horizontal drilling rig drills holes on the tunnel face. A total of 3 drill holes are arranged. Except the middle hole is drilled along the tunnel axis, the rest of the holes are drilled outwards. The bottom of the hole is 7.00m beyond the excavation contour line. The overlapping length of two advanced drilling holes is 6.00m;

[0034] S3. Excavation is carried out by using the ring-shaped different pit method, and the footage is 1.00m per cycle;

[0035] S4. Strengthen the drainage of the inner tunnel during the construction process

Embodiment 3

[0040] A method for constructing a tunnel loose massive broken zone proposed by the present invention comprises the following steps:

[0041] S1. Arrange 28 blasting drill holes in the side walls on both sides of the tunnel, with a distance of 0.5m, a hole depth of 2.0m, a height of 1.00m from the hole to the bottom of the tunnel, the height of the blast hole and the receiver is the same, and the distance between the receiver and the first blast hole is 30m , the depth of the receiver hole is 1.8m, the hole diameter is 45mm, and each blast hole is 10g.

[0042] S2. The advanced horizontal drilling rig drills holes on the face of the tunnel. A total of 8 holes are arranged. Except for the middle hole, which is drilled along the tunnel axis, the rest of the holes are drilled outwards. The bottom of the hole is 3.00m beyond the excavation contour line. The overlapping length of two advanced drilling holes is 12.00m;

[0043] S3. Excavation by ring-shaped different pit method, with

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PUM

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Abstract

The invention provides a tunnel loose block fracture zone building method. An explosive drilling hole is respectively formed in two side walls of the tunnel; the height of a blast hole is the same as the height of a receiver; then micro-vibration is conducted after all elements are well arranged; a hole is drilled in a tunnel face by an advanced horizontal drilling machine; the rest holes are all outwardly drilled except the center drilling hole drilled along an axis of the tunnel; an annular various-pit drilling method is employed for excavation; water is discharged from an inner cave during construction; water drainage slopes are preserved in the longitudinal and transverse direction during excavation of the upper, lower and middle parts; water is led to the axial middle part of the tunnel, so the arc wall foot is depowered and water on the work surface can be instantly pumped to a water pit; the cave is kept dry and immersion damage to an inverted arch and a wall foundation soil layer by accumulated water can be prevented; and then each part is excavated in a circular way. Deficiencies existing in a super-support are analyzed; parameters affecting support effect is researched and adjusted on the basis of the original design scheme; optimum parameters are determined via tests and great supporting effect is achieved; and scheme changes are avoided and cost is reduced and construction progress is ensured.

Description

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Claims

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Application Information

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Owner THE 1ST ENG CO LTD OF CHINA RAILWAY 25TH BUREAU GRP
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