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When constructing the pipe jacking machine, in addition to solving the underground problems, it is also necessary to protect the ground Buildings on the surface, such as houses, highways, high-speed railways, etc.
Geological structure and survey, engineering geological survey, let us have a perspective, but we don’t have a perspective.
Borehole sampling exploration uses a geological drill to drill deep holes under the surface, and then uses a hollow drill to take rock and soil samples out of the ground for sampling analysis.
The pipe jacking machine for undercrossing high-speed railway has high requirements when crossing high-speed railway.
Through measuring the penetration resistance of the soil through the measuring system, some basic physical and mechanical properties of the soil can be determined, such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc.
In order to ensure smooth traffic, the original road shall be widened or diverted to ensure the normal passage of vehicles and pedestrians.
After sedimentation, it is transported to the designated place for treatment.
How can we understand the underground situation? At this time, we should rely on engineering geological survey.
It is also important to protect the ground buildings.
The control room is the operation room that controls the jacking force, jacking speed, jacking direction, jacking pressure and other driving parameters of the pipe jacking machine.
The determined construction site of the working well shall be located in the open area as far as possible, without occupying the comprehensive pipeline position.
Is it possible to put the sewage pipeline into operation after the infrastructure is completed? Not yet! We also need acceptance and test run.
A.
Eliminate all kinds of obstacles underground “There are all kinds of obstacles under the road block.
In order not to cross with the important pipeline, after accurate exploration and measurement, the buried depth of the pipeline will be reduced by another 5 meters to ensure a safe distance of more than 3 meters from the important pipeline, and a series of protection measures such as emergency plans have been prepared simultaneously.
Pipeline relocation: complex pipelines are buried underground in the city, such as electric power, communication, gas and water pipelines, which need to be protected or relocated before construction.
C.
Green plants within the scope of greening and relocation construction need to be relocated and restored after the completion of construction.
Road restoration shall be carried out after construction.
Pipe jacking construction is not a simple thing! Because pipelines are generally underground, we need to fully understand the underground world.
The water inlet and sludge discharge system is mainly composed of water inlet valve, sludge discharge valve, bypass valve and pipeline.
C.
Step1 pipe-making plant prefabricated the pipes and transported them to the construction site Step2 lifted the pipes into the working shaft through the crane Step3 pipes in place Step4 pipe jacking machine jacking machine is like a “steel pangolin” pipe jacking machine is like a “steel pangolin”, where it jacking, the long pipe is completed.
Generally, the spacing between boreholes is tens of meters.
When encountering complex geological conditions such as underground karst caves and boulders, the spacing between boreholes is reduced to several meters.
Static penetration test refers to the use of a pressure device to press the feeler rod with a contact probe into the test soil layer.
B.
The length of each section of pipeline is generally 2-2.5m.
When encountering the toxic and harmful gases underground, it is necessary to carefully detect and discharge before construction.
It can be unobstructed under the ground like a pangolin! Most of the outlet pressure pipe works of Wangjiatang Pump Station are constructed by pipe jacking, which is a very special machine, called pipe jacking machine.
The operator can adjust the jacking status in time to make the pipe jacking machine drive in the right direction.
“Steel pangolin” will not get lost if it moves in the dark underground? Of course not.
The underground is generally composed of very complex rock and soil.
The advanced pipe jacking machine is equipped with a high-precision measuring system, which can dynamically determine the current position.
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In order to prevent the ground settlement from affecting the line transportation, it is necessary to reinforce the stratum above the tunnel.
After the pipeline is installed in place, place the water stop rubber ring.
Before the safe and economical construction and excavation of the working well, it is necessary to deal with the buildings, greening and pipelines that affect the construction, so as to reduce the impact of construction on traffic.
Important pipeline protection The outlet pipeline of Wangjiatang pump station needs to pass through the pipeline of PetroChina and West-East Gas Pipeline.
How did the pipe-jacking construction proceed? Now, let’s use the most understandable way to “raise your posture”! Pipe jacking construction is not easy.
The system converts the soil cut by the cutter head into mud through high-pressure water flow, and then transmits it to the ground through the mud pipeline.
6 “Steel pangolin” drilling artifact The drilling artifact for pipe jacking is called “pipe jacking machine”.
B.
A.
When encountering the soft and hard strata above and below, due to uneven stress, it is easy to cause the cutter head damage and ground collapse, which needs to be carefully promoted or handled in advance.
