Ventilating and dust-removing construction method for excavating small-section tunnel with single-cantilever heading machine

Abstract

The invention belongs to the technical field of water conservancy and hydropower engineering and relates to a ventilating and dust-removing construction method for excavating a small-section tunnel with a single-cantilever heading machine. According to the invention, an air draft pipeline is connected with the heading machine; a spray head is arranged on the upper part of a drill bit of the heading machine; a control valve is arranged on one side of the spray head; the outlet end of the air draft pipeline is arranged in a dust settling chamber; the dust settling chamber is provided with a primary filtering chamber at the outlet end of the air draft pipeline; a main filtering chamber is arranged in the dust settling chamber; a dust settling chamber spray head is arranged on the upper part of the main filtering chamber; and a water spraying pipe is connected with the dust settling chamber spray head. According to the invention, the ventilating and dust-removing construction method overcomes the problem that a large amount of smoke and dust in a tunnel do harm to the occupational health of staff and the problem that the smoke and dust in the tunnel interfere with the sight of an operator of the heading machine is solved, controls corresponding construction cost from the aspects of over-excavation and under-excavation, solves the problem of long time in waiting for resuming tunnelexcavation after smoke dissipation, further accelerates tunneling operation, improves tunnel excavation progress, and overcomes the problem that local water conservation and environmental protection are affected due to substandard emission of smoke outside the tunnel.

Description

technical field [0001] The patent of the invention belongs to the technical field of water conservancy and hydropower engineering, and relates to a construction method for ventilation and dust removal of small-section tunnels excavated by a single-cantilever roadheader. Background technique [0002] At present, the selection of ventilation and dust removal methods for roadheader tunnel construction generally adopts two types: press-in type and mixed type. Through the whole hole, it is generally only suitable for tunnels with shorter distances. [0003] During the construction process of the roadheader, the selection of ventilation and dust removal schemes mainly depends on the size of the tunnel excavated by the roadheader, the length of the excavated tunnel, and the influence of other conditions during the construction process. Good construction ventilation is an important factor in the construction process of the roadheader. In this link, we should not only consider the p...

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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the prior art, provide a cantilever roadheader to excavate a small-section tunnel ventilation and dust removal construction method, solve the problem of smoke and dust generated by the roadheader cutting during tunnel excavation, and further solve the problem of being discharged from the tunnel to Whether the discharge of dust outside the tunnel meets the local water environmental protection requirements, the present invention is mainly applicable to the excavation and dust removal and dust reduction construction of small-section long-distance tunnel cantilever-type roadheaders

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