Single-tube type concrete spray device capable of preventing rebound

Abstract

The invention relates to a single-tube type concrete spray device capable of preventing rebound. The device is characterized by comprising a high-pressure air nozzle assembly, a concrete spray gun andan air spray device, wherein the high-pressure air nozzle assembly comprise an end plate, an air spray tube outer tube, an air spray tube inner tube and a flared port; a concrete spray gun insertionhole is formed in the center of the end plate, and a plurality of air inlets are also formed in the end plate; one end of the air spray tube outer tube is connected with an outer ring of the end plate, the other end is connected with the end with smaller diameter of the flared port, and one end of the air spray tube inner tube is connected with an inner ring of the end plate; the concrete spray gun penetrates the concrete spray gun insertion hole and is fixed with the end plate; the air spray device comprises air inlet pipes with the same number as air inlet ports, and the ends of the air inlet pipes are fixed at the corresponding air inlet ports. The device can stop rebound of concrete, avoid material waste, and can also flatten, extrude and vibrate the concrete already attached to surrounding rocks, so that the contact between the concrete and the surrounding rocks is firmer, and cavities and gaps cannot be generated in the concrete.

Description

technical field [0001] The invention relates to the field of primary lining construction of sprayed concrete for surrounding rocks of tunnels, in particular to a single-pipe concrete spraying device for preventing rebound. Background technique [0002] In the tunnel lining construction process, high-pressure pump trucks are generally used to spray concrete onto the surface of the tunnel surrounding rock as the primary lining, such as the pulse concrete spraying machine with the application number CN201710467538.7, which includes a base, universal wheels, and a concrete warehouse , spray pipe and nozzle; the middle part of the lower surface of the base is fixedly connected with a steering motor, the top of the rotating shaft is fixedly connected with a turntable, the upper surface of the turntable is fixedly connected with a bracket, the lower surface of the spray pipe is hinged with a telescopic mechanism, and the lower surface of the turntable is fixedly connected There is ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a single-pipe concrete spraying device for preventing rebound in order to solve the problem of concrete rebound splashing and breaking away from surrounding rock in the process of concrete spraying in the prior art, thereby greatly reducing the rebound splashing of concrete and improving the quality of concrete. Construction efficiency, reduce project cost

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