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Freezing construction method for tunnel contact channel

A communication channel and construction method technology, applied in the field of frozen construction of tunnel communication channels, can solve problems such as failure to meet the requirements of communication channel excavation, unreasonable design of freezing holes, and large impact on tunnels, etc., to prevent a large amount of muddy water from gushing out, Accelerate the freezing speed and the effect of simple process

Inactive Publication Date: 2020-05-19
INSTALLATION ENG CO LTD OF CCCC FIRST HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing technology is used in the freezing construction of the tunnel communication channel, the frost heave has a great influence on the tunnel, and the design of the freezing hole is unreasonable, which makes the construction have certain safety hazards and cannot meet the requirements of the communication channel excavation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A freezing construction method for tunnel communication passages, the steps of which are:

[0058] (1) Construction preparation

[0059] Before starting work, process the workpieces, including drill bit assembly, freezing pipe, orifice pipe, extension rod for upper plug, plug, brine dry pipe, collection and distribution pipe, freezing pipe head, clean water tank, brine tank , Tunnel prestressed support, end well lifting frame and communication channel waterproof door;

[0060] (2) Freezing Curtain

[0061] (2.1) When actively freezing, no precipitation measures shall be taken within 200m near the freezing area, and there shall be no concentrated water flow in the soil layer in the freezing area;

[0062] (2.2) Lay an insulation layer on the inner side of the tunnel near the freezing curtain, and the laying range is 2m to the boundary of the designed freezing wall. The insulation layer is made of flame-retardant soft plastic foam insulation material with a thickness of...

Embodiment 2

[0078] A freezing construction method for tunnel communication passages, the steps of which are:

[0079] (1) Construction preparation

[0080] Before starting work, process the workpieces, including drill bit assembly, freezing pipe, orifice pipe, extension rod for upper plug, plug, brine dry pipe, collection and distribution pipe, freezing pipe head, clean water tank, brine tank , Tunnel prestressed support, end well lifting frame and communication channel waterproof door;

[0081] (2) Freezing Curtain

[0082] (2.1) When actively freezing, no precipitation measures shall be taken within 200m near the freezing area, and there shall be no concentrated water flow in the soil layer in the freezing area;

[0083] (2.2) Lay an insulation layer on the inner side of the tunnel near the freezing curtain, and the laying range is 2m to the boundary of the designed freezing wall. The insulation layer is made of flame-retardant soft plastic foam insulation material with a thickness of...

Embodiment 3

[0099] A freezing construction method for tunnel communication passages, the steps of which are:

[0100] (1) Construction preparation

[0101] Before starting work, process the workpieces, including drill bit assembly, freezing pipe, orifice pipe, extension rod for upper plug, plug, brine dry pipe, collection and distribution pipe, freezing pipe head, clean water tank, brine tank , Tunnel prestressed support, end well lifting frame and communication channel waterproof door;

[0102] (2) Freezing Curtain

[0103] (2.1) When actively freezing, no precipitation measures shall be taken within 200m near the freezing area, and there shall be no concentrated water flow in the soil layer in the freezing area;

[0104] (2.2) Lay an insulation layer on the inner side of the tunnel near the freezing curtain, and the laying range is 2m to the boundary of the designed freezing wall. The insulation layer is made of flame-retardant soft plastic foam insulation material with a thickness of...

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Abstract

The invention provides a freezing construction method for a tunnel contact channel. The freezing construction method comprises the steps that construction preparation is conducted; a freezing curtainis designed, and it is ensured that the frozen soil strength meets the requirements; freezing holes are designed; and temperature measuring holes and pressure relief holes are designed. Compared witha traditional freezing construction method for a tunnel contact channel, by setting the reasonable positive freezing time, the designed heat dissipation amount of each meter of freezing tube comprising a frozen rack tube is not less than 100 kcal / h, the low saline water temperature and the high saline water flow are adopted, thus the freezing speed is increased, the pressure relief holes are formed in the proper positions, and the influence of frost heaving on a tunnel is reduced; and by setting reasonable freezing hole number, distribution and mounting parameters on the contact channel, the requirements of the freezing holes in the contact channel are met, gush of a large amount of muddy water during drilling is prevented, construction is safe, and thus the excavation requirements of thecontact channel are met.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering communication passage construction, in particular to a freezing construction method for tunnel communication passages. Background technique [0002] The communication channel is an emergency channel set between two tunnels, which is convenient for one tunnel to directly lead to the other tunnel, and plays the role of communication, drainage and fire prevention. If there is a problem in one tunnel, pedestrians can transfer to the other through the connecting channel. Tunnels greatly increase the safety factor, so they are called "escape channels"; at the same time, it is also convenient for rescuers to reach the communication channel from another tunnel when there is a problem in one tunnel, and then enter the position that needs rescue through the communication channel. Reach the purpose of quick rescue for quick escape and rescue. [0003] The design of the communication channel usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/00E21F17/00
CPCE21D11/00E21D11/003E21D11/10E21F17/00
Inventor 张春雷赵运乐田福军张昭王龙
Owner INSTALLATION ENG CO LTD OF CCCC FIRST HARBOR ENG
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