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A full-circle excavation construction method

A construction method and tunnel excavation technology, which is applied in earthwork drilling, shaft equipment, shaft lining, etc., can solve the problems of difficult access of large mechanical equipment, long time-consuming tunnel closure, and influence on construction progress, so as to shorten the construction period and improve The effect of improving construction quality and improving construction efficiency

Active Publication Date: 2021-11-30
SANCHU OF CHINA RAILWAY TUNNEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are dangerous rockfalls, rock piles, karst, high ground temperature, gas, radioactive and harmful gases, etc. It takes a long time to close the tunnel, the construction space is small, and it is difficult for large machinery and equipment to enter, which affects the construction progress

Method used

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  • A full-circle excavation construction method
  • A full-circle excavation construction method
  • A full-circle excavation construction method

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Experimental program
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Effect test

specific Embodiment approach 1

[0035] Specific implementation mode one: combine figure 1 To illustrate this embodiment, after the drilling, measuring and setting-out of the working face of the railway single-track tunnel is completed, the rock drilling jumbo is used to drill and blast the part above the tunnel rail surface 50 and simultaneously drill with the inverted arch 52 to complete a one-time operation. For the full-ring excavation work of blasting, the initial support of the arch wall and the initial support of the inverted arch 52 are performed simultaneously to complete the one-time full-ring support work. After the completion of the one-time full-ring support work, the inverted arch 52 Backfill the drill face 51 with the ballast, reserve the drilling position for the drilling rig to advance the beam, and then transport away the empty ballast during the construction of the inverted arch 52 in the later stage, and then construct the inverted arch 52 and the filling part 56, and then cycle in sequence...

specific Embodiment approach 2

[0036] Specific implementation mode two: combination figure 1 with figure 2 Describe this embodiment. In this embodiment, before the full-ring excavation work of one-time blasting, it is necessary to determine whether the full-ring excavation method can be directly carried out according to the advanced geological forecast. If the standard is up to the standard, the construction method of the full ring excavation method will be directly carried out; if the corresponding judgment parameters and judgment standards in the advanced geological forecast are not up to the standard, advanced support will be required. The corresponding judgment parameters and judgment criteria that can directly carry out the full ring excavation construction method are as follows:

[0037] Lithology: it needs to be slate, schist or phyllite;

[0038] Metamorphic traits: low-temperature and high-pressure metamorphic environment flysch, sericitization to slight chloritization can be seen;

[0039] Geo...

specific Embodiment approach 3

[0056] Embodiment 3: This embodiment is a further limitation of Embodiment 2. During the advance support work process, when performing advance support on the weak and broken section of the surrounding rock of the tunnel, the optimal choice is to use small conduits for advance support . The specific operation process is as follows:

[0057] Use a rock drilling rig to drill holes, use a hammer or a drill to push in a small conduit, and inject grout with a grouting pump. The longitudinal overlapping length of the small conduit is not less than the design, and the external insertion angle meets the requirements of the specification, and is roughly parallel to the centerline of the line. The drilling deviation of the hole position shall not exceed 10cm, the drilling depth shall be 5-8cm greater than the length of the small conduit, and the length of the steel pipe jacking shall not be less than 90% of the pipe length, and the sand and gravel in the pipe shall be blown out with hig...

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Abstract

A full ring excavation construction method. In the process of excavating the tunnel on the surrounding rock, the frequent disturbance of the surrounding rock by multiple blastings in the conventional subdivision excavation process affects the self-stability of the surrounding rock. The tunnel closure takes a long time and the construction space is small. Enter and affect the construction progress. The present invention is to use the rock drilling jumbo to drill and blast the excavation above the tunnel rail surface at the same time as the inverted arch to complete the full-circle blasting after the completion of the drilling, measuring and setting-out of the working face of the excavation of the railway single-track tunnel. For the excavation work, the initial support of the arch wall and the initial support of the inverted arch will be implemented simultaneously to complete the one-time full-ring support work. After the completion of the one-time full-ring support work, the inverted arch will be backfilled to the palm On the sub-surface, reserve the drilling rig position for advancing the beam, and then transport away the void ballast during the invert construction in the later stage, and then construct the invert and filling parts, and then cycle operations in sequence, and finally gradually advance to complete the tunnel excavation operation. The invention belongs to the field of roads and bridges.

Description

technical field [0001] The invention relates to an excavation construction method, which belongs to the field of roads and bridges. Background technique [0002] In tunnel construction, whether the tunnel excavation method can be selected correctly is an important consideration factor that affects the stability of the tunnel structure and construction safety. During the excavation process of weak surrounding rock, different excavation methods and construction steps will produce different surrounding rock loosening circles, which will cause the stress redistribution of surrounding rock, thereby affecting the stability of surrounding rock, and will also have a certain impact on the construction progress. [0003] Under normal circumstances, tunnels with weak surrounding rocks generally adopt the step method or partial excavation method. However, with the rapid development of railway tunnel construction in my country and the continuous increase in labor costs, construction mech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D9/10E21D11/10
CPCE21D9/003E21D9/006E21D9/10E21D11/105
Inventor 鲜国赵勇吴维州李传富周跃峰
Owner SANCHU OF CHINA RAILWAY TUNNEL GROUP
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