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Full-ring excavation construction method

A construction method and technology for tunnel excavation, which are used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve problems such as difficulty in entering large-scale machinery and equipment, long time-consuming tunnel closure, affecting construction progress, etc., to shorten the construction period and improve the The effect of construction quality and improving construction efficiency

Active Publication Date: 2019-12-27
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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  • Full-ring excavation construction method

Examples

Experimental program
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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 excavation work of the full circle of the blasting, the initial support of the arch wall and the initial support of the inverted arch 52 are 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 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 cy...

specific Embodiment approach 2

[0036] Specific implementation mode two: combination figure 1 and 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 judging parameters and judging 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] Geolog...

specific Embodiment approach 3

[0055] 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:

[0056] 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 shall not be less than the design, and the external insertion angle shall meet the requirements of the specification and be roughly parallel to the line centerline. 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, 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 high...

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Abstract

The invention discloses a full-ring excavation construction method, and belongs to the field of roads and bridges. In the process of excavating a tunnel on surrounding rock, in the case of a conventional subsection excavation process, due to frequent disturbance caused by multi-time blasting on the surrounding rock, the self-stability performance of the surrounding rock is influenced, tunnel closing consumed time is long, the construction space is small, large mechanical equipment is difficult to feed, so that the construction progress is influenced. The method is characterized in that after railway single-line tunnel excavation working face drilling measurement paying off is completed, and when a rock drilling trolley is used for performing drilling and blasting excavation on the portionabove a tunnel rail surface, drilling is performed on an inverted arch simultaneously, the one-time blasting full-ring excavation work is completed, arch wall initial support and inverted arch initialsupport are synchronously applied, the one-time full-ring support work is completed, after the one-time full-ring support work is completed, the inverted arch is backfilled to a tunnel face through hole ballast, rock drilling trolley propulsion beam drilling position is reserved, then loose ballast during the later-stage inverted arch construction is transported away, then the inverted arch and afilling portion are constructed, and sequential cycle operation is performed, and finally step-by-step propulsion is performed to complete the tunnel excavation operation.

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 the surrounding rock, thereby affecting the stability of the 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, constru...

Claims

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Application Information

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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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