As a manufacturer, 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 different pipeline applications to us is our first service for all users. Let ’s take a look at the precautions for the use of cement jack pipe with us.
In the practical pushing process of cement pipe jacking, it is impossible to be completely in the above ideal state. If the pushing speed is faster than the soil discharge speed, we will push and stop and insist on pushing forward. Conversely, the screw conveyor can be started and stopped. 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, the ground will sink On the contrary, the ground will arch. Therefore, the control of the setting of the earth pressure and the persistence of the earth pressure in the silo are the key.
In terms of measurement and direction control: the top-up measurement and direction control is to use a laser theodolite supplemented with a level gauge to measure, and then correct it through the oil cylinder. Follow the guidelines of first correcting up and down, then correcting left and right. We must do the following:
Strict stakeout review system 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 make fine adjustments for 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 carried out, the 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 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 use, that is, the power supply, and the other is the lighting use method, 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 power: Because the air humidity in the pipeline is relatively large, 36V low-voltage lighting power is used, and the low-voltage power must be reduced 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; while the cutter head is cutting and stirring, the main roof and the relay are slowly pushed, and the earth pressure in the earth bunker will gradually increase. When the earth pressure rises above the control earth pressure P When the screw conveyor is turned over, 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.