Emergency support equipment and method for tunnel excavation vault

Abstract

The invention discloses tunnel excavation vault emergency support equipment and a method. The tunnel excavation vault emergency support equipment comprises a carrying vehicle and an arc-shaped arch slab, wherein a concrete grout containing box and a controller are arranged on the carrying vehicle, the arc-shaped arch slab is connected with the upper part of the carrying vehicle through a support frame, and a grout injection pump is arranged on the concrete grout containing box; the whole arc-shaped arch slab is in an arc surface shape, an arc-shaped scraping plate is arranged at the upper surface of the top part of the arc-shaped arch slab, the grout injection pump is communicated with a grout injection pipe, and a grout outlet pipe opening of the grout injection pipe penetrates through the arc-shaped arch slab and is positioned at the top part of the arc-shaped arch slab. The tunnel excavation vault emergency support equipment has the advantages that fast-setting concrete dry material in the grout containing box and the water are conveyed to the upper side of the arc-shaped arch slab by the grout injection pipe; when the concrete is set, the primarily set surface is flattened by the scraping plate; the loose particles are cleaned by a brush at the front end of the arc-shaped arch slab, and the protecting strength and engineering quality are improved; the tunnel vault support is more effectively and timely completed, the tunnel construction speed is accelerated, and the construction safety is guaranteed.

Description

technical field [0001] The invention relates to the field of highway engineering tunnels, in particular to an emergency support device and method for a tunnel excavation vault. Background technique [0002] With the development of my country's economy and the rapid development of transportation infrastructure construction, road construction has gradually deepened in mountainous areas with complex geographical locations. In the process of tunnel construction, the construction of the vault has different choices due to the influence of geological conditions, especially in the soft rock formation, the vault is now very obvious. At present, the common method to solve the broken vault is to use shotcrete for preliminary protection after excavation to ensure the construction quality and the safety of employees. The following problems often exist in the construction of shotcrete: (1) The rebound problem. After the concrete with a certain speed is sprayed onto the excavated vault, p...

AI Technical Summary

Problems solved by technology

The following problems often exist in the construction of shotcrete: (1) The rebound problem. After the concrete with a certain speed is sprayed onto the excavated vault, part of it will bounce off due to too much impulse or insufficient bonding time. What measures should be taken? It is still a relatively complicated technical problem to reduce the rebound rate, and it is difficult for the existing construction teams to grasp; (2) the bonding problem, whether the compactness of the concrete itself and the bonding and compactness of the concrete and the surrounding rock can be guaranteed, this is related to the concrete performance. Did it work as expected

However, its disadvantages are more obvious: the construction speed is slow, a large number of employees are required to work at heights for a long time, and the construction progress and personnel consumption are relatively large

Many front-line practitioners put forward the requirements for mechanical construction. However, the existing construction machinery does not have the function of protecting the tunnel in a short time. Quality and saving human resources are of great significance

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