Jet assisted shield tunneling machine for noncircular-section tunneling construction

Abstract

The invention provides a jet assisted shield tunneling machine for noncircular-section tunneling construction. The machine comprises an anterior shield and multiple cutter heads arranged on the end surface of the anterior shield and further comprises a jet assembly used for cutting section soil layers in an area where the cutter heads cannot perform cutting, the jet assembly is arranged on the end surface of the anterior shield and staggered with the cutter heads, and the jetting travel of the jet assembly covers the cutting blind zones of the cutter heads. The jet assisted shield tunneling machine has the advantages of effective cutting of noncircular sections, high tunneling safety, high universality and the like.

Description

technical field [0001] The invention relates to the field of tunnel excavation, in particular to a jet-assisted shield machine used for excavation construction of non-circular section tunnels. Background technique [0002] In tunnel construction, tunnels with non-circular cross-section requirements are often encountered. Existing excavation methods usually use multiple circular cutter heads to fit non-circular cross-sections, but there will be non-overlapping gaps between the cutter heads. Part of it is mainly at the straight line of the section. At this time, the remaining soil at the bottom of the section can be easily removed because it is close to the soil discharge and slag discharge device, while the remaining soil at the top and side of the section will be squeezed into the inner wall of the soil bin during the advancement of the front shield. The soft soil will adhere and harden on the inner wall of the soil bin, making it difficult for the cutter head to rotate and ...

AI Technical Summary

Problems solved by technology

[0002] In tunnel construction, tunnels with non-circular cross-section requirements are often encountered. Existing excavation methods usually use multiple circular cutter heads to fit non-circular cross-sections, but there will be non-overlapping gaps between the cutter heads. Part of it is mainly at the straight line of the section. At this time, the remaining soil at the bottom of the section can be easily removed because it is close to the soil discharge and slag discharge device, while the remaining soil at the top and side of the section will be squeezed into the inner wall of the soil bin during the advancement of the front shield. The soft soil will adhere and harden on the inner wall of the soil bin, making it difficult for the cutter head to rotate and the shield machine to advance

[0003] In order to solve the above technical problems, the existing method is to use a mechanical root cleaning device to scrape off the soil adhered to the inner wall by using a movable blade. All adhered and compacted soft soils are effectively removed, which poses safety hazards; and the root cleaning device needs to be specially equipped according to the model, which has poor versatility and high cost. At the same time, its structure is complex and requires high manufacturing and assembly precision.

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