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Matters needing attention during pipe jacking construction

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更新时间:2019年09月29日14:47:51 打印此页 关闭 Clicks: 191 Updated: September 29, 2019 14:47:51 Print this page Close

As manufacturers, we have a corresponding understanding of various products related to pipeline equipment. In the current market, there are many types of pipelines, such as cement drainage pipes and cement jack pipes. As a cement pipe manufacturer, introducing us to different pipelines is our first service for all users. Let ’s take a look at the precautions for the use of cement jack pipe with us.

During the practical pushing process of the cement pipe jacking, it is impossible to be completely in the above-mentioned ambitions. If the pushing speed is faster than the soil discharge speed, we will push and stop and keep pushing forward. Conversely, the screw conveyor can be started and stopped. No matter what kind of situation occurs, 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 setting of the control of the earth pressure and the maintenance of the earth pressure in the silo are key.

In terms of 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 correct it through the oil cylinder, following the principle of first correcting up and down and then correcting left and right, we have to do the following:

There are strict guidelines for stakeout review and original records. It is necessary to prevent displacement and deformation of the instrument base arranged behind the operating well, and it is necessary to repeat the measurement and adjust it in time. It is necessary to measure and fine-tune the jacking correction, and the correction angle 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 performed, the pipe jacking machine must first formulate a plan and adjustment of the slope, which is also to achieve the quality that satisfies the customer.

Power supply arrangement of the cement pipe jacking machine: There are two main ways of using electricity in the jacking process of the cement pipe jacking machine. One is the power electricity, that is, the power supply, and the other is the lighting electricity mode, that is, the lighting electricity. The motor in the pipeline uses 380V power, so 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: Due to the relatively high humidity of the air in the pipeline, 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 pipe jacking machine uses earth pressure balance. It 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 pressure. 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 silo will gradually increase. When the earth pressure rises above the control earth pressure P, The screw conveyor is opened and a 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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