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• Time of issue:2020-09-28 16:58
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(Summary description)1. Main roof equipment and installation The main jack is installed in the jacking work pit and is used to push the pipe into the soil. Its form is a hydraulically driven piston type double-acting cylinder. The main jack equipment is mainly composed of the following devices: 2-8 main jack jacks; combined jack frame; hydraulic power, pump station and pipe valve; jack iron. 2. Top iron installation 1) The main function of the jacking iron is to distribute the thrust of the main jack jack to the pipe end face of the jacking pipe relatively evenly, and at the same time it also protects the pipe end face, and at the same time can extend the stroke of the short-stroke jack. The top iron adopts several forms of ring top iron, arc-shaped top iron and "U"-shaped top iron. 2) The installation and use of the top iron shall comply with the following regulations: The axis of the top iron after installation should be parallel and symmetrical with the axis of the pipeline, and the contact surface between the top iron and the guide rail and the top iron must be free of oil; when replacing the top iron, use a longer top iron first; lock the top iron after assembling; A buffer liner is added between the top iron and the nozzle. When the top force is close to the allowable compressive strength of the pipe section material, a U-shaped or ring-shaped top iron is added to the pipe end.