A tunnel boring machine power supply cable extension device and operation method

Abstract

The invention discloses a power supply cable prolonging device for a tunnel heading machine. The power supply cable prolonging device is characterized by comprising an A-segment cable circuit, a B-segment cable circuit and at least one C-segment cable circuit which are electrically connected in sequence, wherein the A-segment cable circuit consists of a transformer, a switch and a first three-way high-voltage cable joint which are electrically connected in sequence; the B-segment cable circuit consists of a second three-way high-pressure cable joint, a first high-voltage cable and a heading machine which are electrically connected in sequence; the C-segment cable circuit consists of a third three-way high-voltage cable joint, a second high-voltage cable and a normal high-voltage cable joint which are electrically connected in sequence. The invention further provides an operation method of the power supply cable prolonging device. The device has a reasonable structure, can be used for prolonging a high-voltage cable in a power-on state, is low in cost, and is convenient to use. The operation method is scientific and reasonable, and has high adaptability and a good effect.

Description

technical field [0001] The invention belongs to the technical field of roads and water conservancy projects, and in particular relates to a tunnel boring machine power supply cable extension device and an operation method. Background technique [0002] With the rapid growth of urban transportation, railways, highways, water conservancy, and other municipal engineering construction projects, China has become the world's largest Tunnel Boring Machine (TBM) manufacturing base and application market. The power supply voltage of TBM is generally 20kV, and the power supply mode is connected by the lead wire of the nearby electric tower to a special transformer, and the transformer is connected to the TBM by a high-voltage cable. With the increase of tunnel excavation length, the length of a single high-voltage power supply cable is usually 500 meters, and two or more cables need to be connected according to the tunnel excavation length. At present, high-voltage cable quick connect...

AI Technical Summary

Problems solved by technology

As the length of tunnel excavation increases, the length of a single high-voltage power supply cable is usually 500 meters, and two or more cables need to be connected according to the length of tunnel excavation. At present, high-voltage cable quick connectors are generally used to achieve cable growth. However, The high-voltage cable quick connector has the problem of poor contact, which will lead to voltage instability and accidents

However, the current use of high-voltage cable quick connectors to achieve cable growth requires operation under power outages. Power outages lead to TBM shutdowns, and every day of shutdown will cause nearly ten million economic losses.

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