Thermal shock device and method for shield tunneling machine

Abstract

The invention relates to a thermal shock device and method for a shield tunneling machine, and belongs to the technical field of shield construction. The thermal shock device comprises a temperature measuring device arranged on a cutter head, heating pipelines and cooling pipelines, wherein the heating pipelines and the cooling pipelines are parallelly arranged on the end surface of the cutter head of the shield tunneling machine and uniformly distributed in the circumferential direction of the cutter head; the position, away from the end surface of the cutter head, of each heating pipeline isprovided a plurality of ignition devices which are sequentially distributed in the length direction of the heating pipeline, and heating switches used for controlling the ignition devices; the position away from the end surface of the cutter head, of each cooling pipeline is provided a plurality of cooling spray heads sequentially distributed in the length direction of the cooling pipeline, and cooling switches used for controlling the cooling spray heads; and the ignition devices and the cooling spray heads are lower than cutters on the cutter head. By utilizing a thermal shock principle, aspecial competent formation is rapidly heated and cooled, a lot of heat exchange is quickly generated, shock thermal stress is generated inside, and shock fracturing is caused, the mechanical propertyof the special competent formation is reduced, the rock breaking speed is increased, and cutter head abrasion is reduced.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, and relates to a thermal shock device and method for a shield tunneling machine. Background technique [0002] In the underground construction process of shield excavation, special hard strata (hard rock, piles, etc.) are often excavated directly, which increases the wear of the cutter head of the shield machine and reduces the service life of the cutter head; moreover, the actual construction It is often necessary to carry out a long length of closed excavation. Due to the wear of the cutterhead, it is inconvenient to open the warehouse and change the cutter halfway, which affects the construction efficiency. [0003] Thermal shock refers to that due to rapid heating or cooling, the object generates a large amount of heat exchange in a short period of time. When the temperature changes drastically, the object will produce shock thermal stress. This phenomenon is called thermal shock. A...

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a thermal shock device and method for a shield machine, which utilizes the principle of thermal shock to cause impact fractures in rocks, reduces the difficulty of excavation, and solves the problem of direct excavation of hard rock formations encountered during shield tunneling. The problem of accelerated cutterhead wear

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