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A construction method for excavating and extending an existing tunnel without interrupting traffic

A technology with existing tunnels and construction methods, applied in tunnels, earthwork drilling, mining equipment, etc., to achieve the effect of improving structural stability and integrity, improving rigidity and stability, and ensuring structural safety

Inactive Publication Date: 2016-08-17
CHANGAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is safe and reliable, effectively solves the safety problem of the existing tunnel structure during the construction process, ensures the integrity of the tunnel structure, and reduces the traffic interference caused by the expansion construction; the newly dug and expanded caverns are used for placement and arrangement The municipal pipe network relieves the pressure of pipe network construction in municipal infrastructure, greatly improves the space utilization rate, and has no impact on the city appearance

Method used

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  • A construction method for excavating and extending an existing tunnel without interrupting traffic
  • A construction method for excavating and extending an existing tunnel without interrupting traffic
  • A construction method for excavating and extending an existing tunnel without interrupting traffic

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: The construction method of the present invention is applied and implemented in the excavation and expansion project of No. XX tunnel in A city

[0037] A construction method for digging and extending an existing tunnel without interrupting traffic, comprising the following steps in sequence:

[0038] a. First build a barrier 1 on the left half of the lane, then close the tunnel on the left side of the barrier 1, prohibit vehicles from passing, and start adding anchor rods 2 to the original arch waist and arch foot on the left side of the tunnel;

[0039] b. After the addition of the anchor rod 2 on the left side of the tunnel is completed, the tunnel on the left side is opened, and then the tunnel on the right side of the barrier 1 is closed, and the anchor rod 2 is added to the original arch waist and arch foot on the right side of the tunnel;

[0040] c. Cut out the pavement layer and inverted arch on the right side of the existing tunnel, carry out the ...

Embodiment 2

[0050] Embodiment 2: The construction method of the present invention is applied and implemented in the excavation and expansion project of No. XX tunnel in B city

[0051] The difference between this embodiment and embodiment 1 is:

[0052] The initial support of the expansion area is mainly composed of shotcrete, anchor rods, steel mesh and steel arches. The sprayed concrete adopts C25 concrete, and the sprayed thickness is 20cm; the described anchor rod adopts a 4.5m long Φ25 mortar anchor rod, and the longitudinal distance is 100cm, and the circumferential distance is 100cm; the described steel mesh adopts 10×10cm φ10 Steel bars; the steel arch frame adopts I22b I-beam.

[0053] The temporary support of the expansion area is mainly composed of shotcrete, anchor rods, steel mesh and steel arches. The sprayed concrete adopts C25 concrete, and the sprayed thickness is 15cm; the described anchor rod adopts 3m long Φ22 mortar anchor rod, and the longitudinal spacing is 100cm,...

Embodiment 3

[0054] Embodiment 3: The construction method of the present invention is applied and implemented in the excavation and expansion project of No. XX tunnel in C city

[0055] The difference between this embodiment and embodiment 1 is:

[0056] The initial support of the expansion area is mainly composed of shotcrete, anchor rods, steel mesh and steel arches. The sprayed concrete adopts C25 concrete, and the sprayed thickness is 18cm; the described anchor rod adopts a 4.5m long Φ25 mortar anchor rod, and the longitudinal distance is 100cm, and the circumferential distance is 100cm; Steel bars; the steel arch frame adopts I22b I-beam.

[0057] The temporary support of the expansion area is mainly composed of shotcrete, anchor rods, steel mesh and steel arches. The sprayed concrete adopts C25 concrete, and the sprayed thickness is 12cm; the anchor rod adopts 3m long Φ22 mortar anchor rod, and the longitudinal distance is 100cm, and the circumferential distance is 100cm; ; The st...

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Abstract

The invention discloses an existing tunnel down-digging extension construction method without traffic interruption, which is mainly alternately implemented on the left side and the right side in an existing tunnel hole. The existing tunnel down-digging extension construction method without traffic interruption comprises the following steps: firstly, establishing a partition fence (1), and adding anchor rods (2) on a haunch and an arch springing; then, carrying out down-digging extension, adding a waterproof layer till the lateral drain on the bottom of an extension tunnel on the inner side of the secondary lining of the existing tunnel, and adding a third lining (7); finally, pouring a vertical wall (9) and a reinforced concrete road slab (10), removing the partition fence (1) in the hole, and restoring the normal traffic. The construction method is scientific, reasonable, safe and reliable, the safety problem of the existing tunnel structure in the construction process is effectively solved, the integrity of the tunnel structure is guaranteed, and the traffic interference caused by the extension construction is reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a construction method for digging and expanding an existing tunnel without interrupting traffic. Background technique [0002] With the rapid development of my country's national economy, the pace of urbanization is accelerating, and the total number of residents is increasing. The original heating pipeline and municipal pipeline network can no longer meet the needs of residents' lives. Insufficient heat supply, water supply, power supply, gas supply, poor drainage, poor communication network and other phenomena often occur, seriously affecting the daily life of residents and the brand image of the city, and restricting the development of the city. For this reason, it is necessary to consider the reconstruction and expansion of the original thermal pipelines and municipal pipeline network in order to relieve the increasingly tense pressure, improve the qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/01
Inventor 周勇狄夏永旭贾艳领叶飞
Owner CHANGAN UNIV
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