Primary support construction method for segmented tunneling of large-span tunnel

A primary support and construction method technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of reducing the safety of construction operations, long construction period, and time-consuming and laborious erection, so as to reduce the risk of structural damage and reduce the The effect of input cost and shortened construction period

Pending Publication Date: 2022-05-17
吴杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This support method requires the use of a large amount of I-beams, which is costly, time-consuming and laborious to erect, and has a long construction period. It also takes up work space and is not convenient for the next

Method used

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  • Primary support construction method for segmented tunneling of large-span tunnel
  • Primary support construction method for segmented tunneling of large-span tunnel
  • Primary support construction method for segmented tunneling of large-span tunnel

Examples

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Example Embodiment

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-3 As shown, an initial support construction method for segmented excavation of a large-span tunnel includes the following steps:

[0029] Step 1: According to the actual working conditions, divide the excavation area of ​​N sections along the width direction of the tunnel, and N is not less than 2;

[0030] Step 2: According to the excavation footage, along the tunnel excavation direction, excavate the first excavation area;

[0031] Step 3: Arrange and install an arc-shaped feeder 2 at the top of the first excavation area along the tunnel excavation direction, install a temporary support device 1 at the end of the arc-shaped feeder, and connect the temporary support device to the side wall 4 of the rock formation to be opened. Connected, the adjacent arc-shaped supply pieces are connected by connecting steel bars 9, and t...

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PUM

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Abstract

The invention relates to a primary support construction method for segmented tunneling of a large-span tunnel, during segmented excavation, an arc-shaped supply piece is installed and fixed by adopting a temporary support, a temporary support device comprises a screw sleeve and two symmetrically arranged connecting units, and each connecting unit comprises an end plate and a screw rod which are connected in sequence; the screwing directions of the screws of the two connecting units are opposite or the screwing directions of the internal threads at the two ends in the threaded sleeves are opposite, the outer ends of the screws are hinged to the end plates through adjusting bolts, and the inner ends of the bolts extend into the threaded sleeves and are in threaded fit with the threaded sleeves. The temporary support does not occupy the lower operation space, facilitates the construction of the next procedure, reduces the structural damage risk caused by blasting and mechanical operation, and is suitable for the temporary support of large-span tunneling with stable surrounding rocks.

Description

technical field [0001] The invention relates to an initial support construction method for segmental excavation of a large-span tunnel. Background technique [0002] During the excavation of the tunnel, support is required. In the process of tunnel excavation, the initial support mostly adopts the steel arch as the main support method. The arch includes several arch units at intervals along the direction of tunnel excavation. Connected by connecting steel bars, each arch unit is composed of several arc-shaped arch pieces connected in sequence. For tunnels that are excavated in stages using the drill and blast method, it is necessary to erect arc-shaped arches at intervals along the direction of tunnel excavation on the top of the first excavated area, and the arc-shaped arches are initially fixed with grouting anchors In order to prevent the displacement of the arc-shaped arches during the grouting of the anchor bolts and the displacement or even falling of the arc-shaped a...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10E21D20/00E21D20/02
CPCE21D9/00E21D11/10E21D11/107E21D11/105E21D20/00E21D20/02Y02E10/20
Inventor 吴杰
Owner 吴杰
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