Electromagnetic formwork for tunnel formwork-spraying pouring

Abstract

The invention discloses an electromagnetic formwork for tunnel formwork-spraying pouring. The electromagnetic formwork is a curtain-type rollable structure and consists of a plurality of formwork units, and all the formwork units are connected through two or more mutually-parallel chains on the back part of each formwork unit; and each formwork unit is provided with an independent electromagnet and provided with an independent power supply loop, and after the electromagnet of each formwork unit is electrified, the two ends of the electromagnet can be attracted on two adjacent steel arch framessimultaneously. The curtain-type electromagnetic formwork can be matched with a formwork-spraying device and overall mounted on a formwork-spraying trolley, the curtain-type electromagnetic formworkcan be attracted on the tunnel steel arch frames, a formwork cavity for pouring can be formed among the electromagnetic formwork, the steel arch frames and the rock surface, thus the rebound path of concrete can be effectively blocked when a spray head sprays the concrete, and the technical problem of concrete rebound is solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering equipment, and in particular relates to an electromagnetic formwork for tunnel mold spraying developed by spraying grout for temporary support. Background technique [0002] In the construction of traditional tunnels and other projects that require temporary support on the excavation surface, the spraying manipulator mostly adopts the construction method of direct spraying on the excavation surface. In order to ensure that the concrete support layer can meet the strength requirements within a certain period of time , it is necessary to add a large amount of admixture or quick-setting agent to the concrete, and the sprayed concrete has a high rebound rate, and the shotcrete will have no less than 20% of the concrete rebound, resulting in a huge waste of building materials and deteriorating the site. The construction environment increases the project cost, and at the same time, the tempor...

AI Technical Summary

Problems solved by technology

[0002] In the construction of traditional tunnels and other projects that require temporary support on the excavation surface, the spraying manipulator mostly adopts the construction method of direct spraying on the excavation surface. In order to ensure that the concrete support layer can meet the strength requirements within a certain period of time , it is necessary to add a large amount of admixture or quick-setting agent to the concrete, and the sprayed concrete has a high rebound rate, and the shotcrete will have no less than 20% of the concrete rebound, resulting in a huge waste of building materials and deteriorating the site. The construction environment will increase the project cost, and at the same time, there will be technical problems such as insufficient strength of the temporary support structure directly sprayed

However, after the support is formed, its surface finish is relatively poor, and the surface needs to be reshaped, which prolongs the construction period.

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