Soil pressure balance shield machine back loading type cutter head foam spraying device

Abstract

A dorsal-loading-type cutter head foam injection device of soil pressure balance shield machine in the technical field of tunnel driving, the dorsal-loading-type cutter head foam injection device of soil pressure balance shield machine is composed of cutter head front panel, steel pipe with spigot flange at inner hole, cutter head back panel, foam pipeline box with sealing threaded hole, sealing ring, sleeve with foam nozzle end opening, diaphragm, flange, gasket, sealing fixed plug, screw, foam, excavation tunnel face and tool; the spigot flange end of the steel pipe with spigot flange at inner hole is connected with the cutter head front panel; the other end is connected with the cutter head back panel; the foam pipeline box with sealing threaded hole is connected with the cutter head back panel; when they are connected, the steel pipe with spigot flange at inner hole is concentric with the foam pipeline box with sealing threaded hole and is enclosed in the steel pipe with spigot flange at inner hole with the sealing ring; when assembles, the opening position of the sleeve with foam nozzle end opening is alignment to the hole of the foam pipeline box with sealing threaded hole. The conception of the device is novel and scientific and detaches at the back of the cutter head and is able to clean and maintain.

Description

Technical field: [0001] The invention relates to a structural form, an assembly method and a maintenance operation for injecting foam into the front of a cutterhead of an earth pressure balance shield machine in the technical field of tunneling. Background technique: [0002] At present, in the excavation operation of the earth pressure balance shield machine in the field of tunneling technology, the function of foam is: 1), the foam can improve the muck soil and increase the fluidity of the muck soil; 2), the tension characteristic of the foam itself, supports Protect the excavated tunnel and prevent tunnel collapse; 3) Inject foam into the front of the cutterhead to lubricate the surface of the cutter and reduce the wear of the cutter and the steel structure of the cutterhead. [0003] The foam spraying device of the cutter head is manufactured in the past: a through hole is drilled on the connecting steel plate between the front panel and the back panel of the cutter head...

AI Technical Summary

Problems solved by technology

Although this device can spray foam to the digging face of the cutter head, the muck and sand discharged from the shield machine during forward excavation can easily damage the foam nozzle. Nozzle clogging, causing foam unit to fail

The structure of the foam injection device installed from the front of the cutter head cannot be replaced once the shield machine is damaged when it is working in the hole.

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