Semi-shield digging mahcine

Abstract

A semi-shield excavator, the excavator body inserted into the front end of the buried pipe is provided with a cutter head with an expansion and contraction mechanism, and a plurality of clamps for fixing and holding the excavator body , through the expansion and contraction actions of these clamps, the inner surface of the buried pipe is freely crimped and released to form a brake shoe. This kind of excavator can realize that there is no need for a vertical shaft for recovery of the body, and the body can be easily recovered to the side of the departure shaft through the inside of the laid buried pipe in a reusable state, thereby shortening the construction period and reducing the cost.

Description

technical field [0001] The present invention relates to a semi-shield excavator for the propulsion method of forming underground pipelines by propelling buried pipes and laying them sequentially. Background technique [0002] Conventionally, a semi-shield excavator is widely known as an excavation propulsion machine for constructing an underground pipeline by a propulsion method. [0003] In the process of constructing the underground pipeline up to the arrival shaft using this conventional semi-shield excavator, the cutter device arranged in front of the excavator body is rotated, and the propulsion device installed in the departure shaft is pushed against the rear of the excavator body. And pressed into the foundation, then sequentially connected on the main body of the excavator, the buried pipe is pushed forward and laid to construct the underground pipeline. [0004] This conventional half-shield excavator is recovered from the arrival shaft after reaching the arrival ...

AI Technical Summary

Problems solved by technology

[0013] However, it is difficult to apply the structure shown in Japanese Unexamined Patent Publication No. 2000-303779 to a semi-shield excavator that has a larger diameter and a different structure than a small-bore propulsion machine.

One of the reasons is that, in the structure shown in Japanese Patent Laid-Open No. 2000-303779, although the pilot pipe 102 having the curved portion 104 protrudes from the front end of the buried pipe 150 and is installed, the main part of the pilot pipe 102 and the buried pipe The outer diameter of 150 is different, and there is a gap between the ground and the outer peripheral portion of the pilot pipe 102 main body from the cutter head 105 to the buried pipe 150. This gap, which is not a problem when the excavation diameter is small, increases with the diameter. Larger, it will become the main cause of foundation subsidence and other problems

In addition, if the bent portion 104 is not provided, the length of the body will be shortened, and the problem described now can be alleviated to some extent, but of course in this case, the direction of propulsion cannot be corrected.

Moreover, the pilot tube 102 shown in the Japanese Patent Laid-Open No. 2000-303779 is only applicable to certain specific pipe diameters. In the case of projects with different pipe diameters, it is necessary to use pilot pipes of other sizes that match it. Catheter 102 such questions

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