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Precautions in the use of cement pipe jacking

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更新时间:2018年07月26日11:13:24 打印此页 关闭 Hits: 1187 Updated: July 26, 2018 11:13:24 Print this page Close
In the actual pushing process of the cement pipe jacking, it is impossible to be completely in the above ideal situation. If the pushing speed is faster than the soil discharge speed, we will push and stop and insist on pushing forward; otherwise, the screw conveyor can be started and stopped. stop. No matter what the situation is, it is necessary to keep the earth pressure in the silo within the range of controlled earth pressure P20KPa, which can ensure the earth pressure balance. If the earth pressure in the silo is less than the active earth pressure, subsidence will occur on the ground On the contrary, the ground will arch. Therefore, the control of the setting of the earth pressure and the insistence of the earth pressure in the silo are the key.

Measurement and direction control: The top-up measurement and direction control is to use a laser theodolite supplemented by a level gauge to measure, and then correct it through the oil cylinder. Follow the guidelines of first correcting up and down and then correcting left and right. We must do the following:

There are strict guidelines for stakeout review and original records. It is necessary to prevent the displacement and deformation of the instrument base arranged behind the operation well. It is necessary to repeat the test on time and adjust it in time. It is necessary to perform diligent measurement and fine-tuning for the jacking correction, and the correction correction point should be kept at 10 ′ ~ 20 ′ and not more than 1. During the initial propulsion phase, the direction is mainly controlled by the main cylinder. Therefore, on the one hand, the main cylinder driving speed must be slowed down, and on the other hand, the cylinder group and the nose must be adjusted continuously. Before each jacking operation is carried out, the jacking machine must first draw up a design and adjustment of the same slope, in order to finally achieve the quality that satisfies the customer.

Power supply placement of cement pipe jacking machine: There are two main ways of using electricity in the jacking process of cement pipe jacking machine. One is power electricity, that is, the power supply. The other is the electricity consumption method when lighting, that is, lighting electricity. The motor in the pipeline uses 380V power. Therefore, it is necessary to achieve secondary protection and ground protection measures for the power that enters the pipeline. The power power cord is set at a place that is not easily accessible by the operator, and a sheath is added outside the power cord to ensure Electrical safety; lighting electricity: Because the air humidity in the pipeline is relatively large, 36V low-voltage lighting electricity is selected, and the low-voltage electricity must be stepped down by a transformer. The lamps and lanterns use waterproof and explosion-proof lamps.

Ground surface sinking control: This jacking machine uses earth pressure balance, which can first calculate the active earth pressure and passive earth pressure at the excavation center of each pipe jacking section, and then set the earth pressure of the tunneling machine to this active earth Between the pressure and the passive earth pressure; together with the cutting and stirring of the cutter head, the main roof and the relay are slowly pushed, and the earth pressure in the earth bunker will gradually increase. When the screw conveyor is opened, part of the soil is discharged by the screw conveyor. As long as the pushing speed is adjusted to match the amount of soil discharged by the screw conveyor, the earth pressure can be maintained at a constant value.

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