External sealing structure for tunnel heading machine

Abstract

The invention provides an external sealing structure for a tunnel heading machine. Filled grout channeling to a cutterhead of the heading machine is effectively avoided, and the tunneling efficiency of the tunnel heading machine is ensured. The external sealing structure is arranged at the tail part of a steel shell of the tunnel heading machine, a tunnel lining structure extends a certain distance into the tail part of the steel shell, an annular gap between the peripheral wall of the tunnel lining structure and the newly-excavated tunnel wall after excavation of a tunnel is filled with the grout, and the external sealing structure has the characteristics that outer annular spring steel plates are fixedly arranged on the positions, on the peripheral wall, of the tail end of the steel shell, one or more outer-layer annular wire brushes with the tail ends being in contact with the newly-excavated tunnel wall after excavation of the tunnel are fixedly arranged on the positions, on the peripheral wall of the steel shell, behind the outer annular spring steel plates, sealing grease is injected into an outer annular cavity between the outer annular spring steel plates and the outer-layer annular wire brushes as well as between every adjacent outer-layer annular wire brushes to form sealing, and the grout is prevented from channeling into the gap between the peripheral wall of the steel shell and the newly-excavated tunnel wall after excavation of the tunnel.

Description

technical field [0001] The invention relates to a tunnel boring machine, in particular to an external sealing structure for the tunnel boring machine. Background technique [0002] In recent years, with the rapid development of my country's construction industry, the construction scale of tunnel projects represented by subways, highways, and municipal projects has increased year by year. With its characteristics of non-excavation, mechanized construction, safety and speed, it is more and more widely used in urban tunnel construction and underwater tunnel construction. [0003] In order to reduce the resistance of the ground when the roadheader is advancing, the excavation section of the roadheader is usually larger than the cross-section of the tunnel, and a gap is artificially formed between the tunnel and the ground. In order to control ground subsidence, holes are usually drilled at the rear of the roadheader for synchronous grouting to fill the void. [0004] During the...

AI Technical Summary

Problems solved by technology

[0005] However, the existing seals are usually only set between the inner surface of the roadheader shell and the outer surface of the tunnel lining, and the gap filling slurry injected during the construction of the roadheader will run to the cutter head of the roadheader along the outer surface of the roadheader shell.

In serious cases, the slurry will solidify on the outer surface of the roadheader casing, increasing the propulsion resistance of the roadheader, and even sticking the cutterhead, increasing the torque of the cutterhead and reducing the cutting efficiency of the excavator

Images