Tunnel concrete lining formwork apparatus

Abstract

The present invention discloses a tunnel concrete lining template device comprising a template system and needle beam system for bearing; the template system comprises template assembly and template pylon; the template assembly comprises arced left die, right die, top die and bottom die; the left die, right die, top die and bottom die are correspondingly connected to form template assembly with round section; the template pylon is hung on the top die; and bottom of the template pylon is respectively installed with left die, right die and telescopic standing demoulding device connected by the bottom die; the needle beam system comprises bearing needle beam placed in the upper part of the tunnel and pre and post supporting leg device for supporting the bearing needle beam; upper end face ofthe bearing needle beam is in slide contact with the top die and the needle beam is placed on the template pylon; and the bottom die is in the detachable structure; the bottom die in the detachable structure is installed with opening part which is able to execute trowel-finishing on the surface of the tunnel bottom arch concrete after detaching or turning over when the concrete is initially set. The template device effectively removes the problem of foam of the traditional whole section template bottom arc foam and improves the internal appearance molding quality of the bottom arc concrete.

Description

technical field [0001] The invention belongs to the construction device of a circular tunnel in the technical fields of water conservancy and hydropower, municipal engineering, etc., and particularly relates to a tunnel concrete lining formwork device. Background technique [0002] At present, the commonly used full-section tunnel lining formwork in China is mainly: the formwork assembly is a closed structure with a circular full section. Steel structure member control, this formwork is the most widely used. However, in the traditional under-mounted steel formwork structure where the needle beam is placed in the middle and lower part of the tunnel, the curved formwork at the bottom arch is closed and inseparable. When pouring concrete, the air bubbles at the bottom are difficult to eradicate. The air bubbles generated cannot be expelled through the bottom mold. Like this, quality defects such as a large amount of air bubbles, milk skin or honeycomb will be produced on the ...

AI Technical Summary

Problems solved by technology

However, in the traditional under-mounted steel formwork structure where the needle beam is placed in the middle and lower part of the tunnel, the curved formwork at the bottom arch is closed and inseparable. When pouring concrete, the air bubbles at the bottom are difficult to eradicate. The air bubbles generated cannot be expelled through the bottom mold

Like this, quality defects such as a large amount of air bubbles, milk skin or honeycomb will be produced on the bottom concrete surface, and usually, in order to solve these defects, generally will set vibrator hole or exhaust hole on bottom mold, this method is inconvenient to operate and The effect is not obvious. After the concrete lining is formed, a large number of concrete surface repairs still need to be done, which seriously affects the surface quality of the concrete and greatly increases the cost of repairs. At the same time, it also increases the tunnel roughness, which greatly affects the water tunnel. overcurrent condition

In addition, because the needle beam in the steel formwork is placed in the middle and lower part of the tunnel, its operating space is limited, which is not convenient for the transportation of steel bars and other required construction equipment, and it is also not convenient for construction personnel to pass and construct, which makes the construction environment change. Difficult to obtain and poor safety performance

[0003] In addition, in the prior art, there has also been a top-mounted steel formwork structure in which the needle beam is placed in the middle and upper part of the tunnel. Although the lower part of the formwork has a large operating space, which is convenient for operators to pass and construct, the top-mounted needle beam steel formwork structure The bottom arch formwork is still closed and cannot be disassembled. It is the same as the aforementioned traditional needle beam steel formwork structure, and cannot effectively guarantee the internal and external quality of the concrete poured at the bottom of the tunnel.

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