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• Time of issue:2020-09-29 16:23
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(Summary description)1. The principle of maintenance and repair The maintenance and repair of the pipe jacking machine must adhere to the principle of "prevention first, condition detection, mandatory maintenance, on-demand maintenance, and equal attention to maintenance", and the maintenance and repair should be carried out by professional and technical personnel. The pipe jacking machine and supporting equipment must be maintained and repaired in accordance with the requirements of the instruction manual and construction plan, and records must be kept. During the long-term stop of tunneling of the pipe jacking machine, regular maintenance should still be carried out. 2. Disassembly and assembly The purpose of disassembling the pipe jacking machine is mainly for the transfer, repair and maintenance after the completion of the construction, and to prepare for the new construction task. After the pipe jacking machine completes the pipeline construction task, the extension track should be laid, and the main roof hydraulic cylinder should be used to push the rotary excavation system out of the working surface to the foundation pit and park it. Before disassembly, work platforms and protective rails must be built, and pedals must be installed on the circular slopes on both sides of the steel shell to prevent workers from sliding down. When disassembling, first remove the wiring of the measuring instrument and the assembled parts, and then remove the main cable of the rotary excavation system and easily damaged sensors (such as alarm and measurement positioning sensors, etc.). The disassembly must be carried out in accordance with the electrical disassembly and assembly specifications. After completing the above-mentioned disassembly work, the rotary excavation system should be hoisted out of the foundation pit as a whole and transported to the overhaul site. When the rotary digging system is put into construction again, the track of the rotary digging system must first be completed in accordance with the construction standards, and then the rotary digging system is steadily placed on the laid track with hoisting equipment. After the above installation work is completed, install cables, lines, sensors and other accessories. The disassembly and assembly of other working systems of the pipe jacking machine shall be carried out in accordance with the disassembly and assembly requirements of different systems (such as: main roof system, soil conveying system, grouting system, electrical system, etc.). 3. Replace the cutting head Each time the rotary excavation system is disassembled, the severely worn cutting heads must be replaced, and the shape and material of the cutting heads should be selected according to the soil conditions of the ground to be constructed, and the arrangement of the cutting heads should be arranged. The cutting tool head is divided into two parts: a tool holder and a tool tip. The material of the tool holder is mostly heat-treated medium carbon steel, and the material of the tool tip is mostly cemented carbide or tool steel. The shape of the cutting head has a front angle and a back angle. The front and back angles of the cutting head should be determined according to the soil conditions. For example, the front and back angles of the hard soil layer should be large (the front angle is about 30°, and the back angle is about 10°); the gravel layer should be small front and back angles (the front angle is about 5°, the back angle is about 5°). About 5°). In addition to the cutting heads installed on the cutting cutter head, cutting heads such as super digging cutters and profiling cutters are also installed in the circumferential direction beyond the diameter of the cutting cutter head. The purpose of using the super excavator is to reduce the abrasion of the casing of the rotary excavation system and improve the maneuverability, that is, to reduce the deflection and propulsion resistance of the pipe jacking machine. But the disadvantage is that it increases the amount of cement mortar poured into the backing. 4. Maintenance of cutting cutter head Every time the rotary excavation system is disassembled and assembled, the soil and sand seals of the cutting cutter must be checked, maintained, and repaired, and the bearings of each part must be lubricated. In order to prevent soil, sand, muddy water, etc. from invading the bearings of the cutting cutter head, several earth and sand seals and bearing lubrication devices are installed between the rotating shaft of the cutting cutter head and the seat hole. The structure of soil-sand seals needs to be determined based on factors such as the depth of the overburden, groundwater pressure, additive pressure, construction period, pipeline length, seal installation location, number of seal layers and lubrication methods. 5. Torque detection of cutting cutter head After the overhaul or technical transformation of the rotary digging system is completed, the torque o