SU1406382A1 - Mobile formwork - Google Patents

Abstract

The invention relates to the mining industry and can be used to erect lining of a pre-tunnel monolithic concrete tunnel. The purpose of the invention is to increase the durability of the formwork. The formwork includes a forming part in the form of a flexible toroidal shell 1 filled with an elastic medium and a cage-jig made in the form of a rigid core made of collapsible sections 3 connected along the end surfaces of the sections 3. is equal to the outer perimeter of the sheath 1. When the core is moved to the side of the bottom, sheath 1 is detached from the opposite end of the hardened concrete. On the side of the finished lining, the outer surface of the shell 1 is bent inward, rolling without slipping into the side of the slab, creating a cavity in the front part for concreting. The shell 1 tightly fits the surface of the core, which eliminates wear and deformation of the shell 1. 2 Il. i a C

Description

A: OS N:

The invention relates to the mining industry and can be used, for example, for erecting lining of a previously completed monolithic concrete tunnel.

The aim of the invention is to increase 1 (formwork resistance).

FIG. 1 depicts the proposed (f-board, general view; in Fig. 2 - section A-A in Fig. 1.

I The mobile formwork contains a form of 1 / 1ую часть, its part in the form of a flexible toroidal shell 1, the cavity 2 of which is closed; it is filled with compressed air, and the supporting part is in the form of a rigid core, made in the form of collapsible sections 3 connected along the end surfaces of the section 3. the shape and number of the ribs are chosen from the condition that the perimeter of each section 3 of the core with the edges 4 is equal to the outer perimeter of the toroidal shell 1, which provides equal- (|; the inner branch is enveloped and 1.

I The length of the core exceeds the length of the |}) o-shaped shell 1 by an amount not less than the width of one section 3 in order to support the toroidal shell over its entire surface. I The proposed formwork works as follows; |.

I After filling the filler pro-space (concrete concrete mixture and as the concrete solidifies, the core is moved

in the direction of the slap. At the same time, the toroid-shaped shell 1 is detached from the opposite end of the hardened concrete and from the side of the finished lining the outer surface of the shell bends inward, rolling without slipping to the side of the slab, creating a cavity in the front part for concrete. The front section 2 of the core is dismantled and mounted in the rear. This process is periodically repeated as it is concreting and rolling. Since the outer perimeter of the toroidal shell 1 is equal to the perimeter of the core with ribs 4, when the outer part of the shell passes inward, a tight fit of the core surface occurs

without the formation of folds and casing of the shell, which eliminates deformation and wear of the shell and increases the reliability and durability of the device.

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Claims (1)

Invention Formula 0 Movable formwork for erecting tunnels from a monolithic concrete tunnel, including a forming part in the form of a flexible toroid-shaped shell filled with 5 elastic medium, a jig frame in the form of a rigid core, made in the form of collapsible sections connected along the end surfaces of in order to improve the durability of the formwork, the core is provided with longitudinal ribs installed along its outer surface, the core perimeter with ribs being equal to the outer perimeter of the toroidal shell. ..; -:. :: W ..; ..-.: -.