Shield structure cutter head mud cake cutting device and cutting method

Abstract

The invention provides a shield structure cutter head mud cake cutting device and cutting method, and relates to the field of shield structure mud cake cutting. The shield structure cutter head mud cake cutting device comprises a high pressure jet device. The high pressure jet device comprises an auto-rotating type sprayer and a barrel body which are installed on a cutter head. The auto-rotating type sprayer is connected with the front end of the barrel body through a main shaft assembly. The main shaft assembly comprises a main shaft. A water channel I is arranged on the side wall of the barrel body. A water channel II is arranged on the front end of the barrel body. The front end of the main shaft is of a hollow structure provided with a water channel III. The water channel I, the water channel II and the water channel III communicate with one another sequentially. A water inlet of the auto-rotating type sprayer communicates with the water channel III. The auto-rotating type sprayer on the device provides rotating power by utilizing reactive force when water flow rushes out, a mud cake is cleaned by 360 degrees with no dead corner through two high pressure column sprayers arranged on the sprayer, cleaned muck falls into an excavation bin and is discharged with a mud pipeline, and practicability is good.

Description

technical field [0001] The invention provides a shield cutter head mud cake cutting device and a cutting method thereof, and relates to the field of shield mud cake cutting. Background technique [0002] In the process of shield tunneling, mud cake formation on the shield cutter head is a major technical problem that affects the mud-water balance shield construction efficiency. According to on-site construction experience, the main reasons for the mud cake formation on the cutter head are as follows: [0003] 1. The design of shield often refers to similar engineering experience plus the geological exploration situation in the early stage of the project. Due to the regional and complexity of geotechnical engineering geological conditions, it often leads to some incompatibility in shield cutter design and cutter arrangement; [0004] 2. The shield cutter head with a small opening ratio or encounters a clay layer with a high clay content, the muck in the center area of ​​the c...

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Problems solved by technology

[0003] 1. The design of shield often refers to similar engineering experience plus the geological exploration situation in the early stage of the project. Due to the regional and complexity of geotechnical engineering geological conditions, there is often a certain incompatibility in shield cutter design and cutter layout;

[0004] 2. The shield cutter head with a small opening ratio or encounters a clay layer with a high clay content, the muck in the center area of ​​the cutter head will not flow smoothly, and the cut clay will adhere to the center area of ​​the cutter head. At the same time, the shield machine itself is configured The layout and pressure of the central flushing device are limited, and the flushing area is limited, so it is difficult to remove the mud attached to the central area of ​​the cutter head in time. As the frictional resistance of the cutter head increases, the jacking thrust increases, and the mud block in the central area hardens and expands continuously. A hard mud cake is formed, and the cutter head loses the ability to cut soil, resulting in slow excavation or even shutdown of the shield machine, which seriously affects the service life of the equipment and the construction progress of the project

[0005] In order to solve the problem of mud cake on the cutter head, there are also related patents that provide a device or method for shield mud cake cutting, but the cutting knife or high-pressure water cutting knife is mostly a fixed nozzle, which is prone to cleaning dead ends, so that the cutting knife cannot completely remove the mud cake

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