How can we find out the underground situation? At this time, we have to rely on engineering geological survey.
The upper soft and lower hard strata.
Through the measurement system to measure the penetration resistance of the soil, 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.
Step1 the pipe factory prefabricates the pipe and transports it to the construction site Step2 the pipe is lifted into the working well by crane Step3 the pipe is in place Step4 the pipe jacking machine is like a “steel pangolin”.
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Traffic relief in order to ensure smooth traffic, the original road shall be widened or diverted to ensure the normal passage of vehicles and pedestrians.
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When encountering the underground toxic and harmful gas, the toxic and harmful gas needs to be carefully detected and discharged before construction.
Pipeline relocation complex pipelines are buried underground in cities, such as power, communication, gas and tap water pipelines, which need to be protected or relocated before construction.
The road shall be restored after the construction is completed.
The operator can adjust the jacking state in time to make the pipe jacking machine drive in the right direction.
the pipe jacking machine under high-speed railways has high requirements when crossing high-speed railways.
The advanced pipe jacking machine is equipped with a high-precision measurement system, which can dynamically determine the current position.
In order to prevent the ground settlement from affecting the line transportation, the stratum above the tunnel needs to be reinforced.
This very special machine is called pipe jacking machine.
Pipe jacking construction is not a simple thing! Because pipelines are generally underground, we also need to fully understand the underground world.
The underground is generally composed of very complex rock and soil.
The pipe jacking machine is like a “steel pangolin”.
“Steel pangolin” will not get lost when it goes underground in the dark.
A.
It is also important to protect the ground buildings during the construction of pipe jacking machine , in addition to solving the underground problems, it is also necessary to protect the buildings on the ground, such as houses, high-speed railways, high-speed railways, etc.
Will the pipe jacking machine get lost when it goes underground in the dark? Of course not.
After the infrastructure is completed, can the sewage pipeline be put into operation? Not yet! We still have to accept and test run.
The working well shall be located in an open area as far as possible without occupying the comprehensive pipeline position.
Generally, the drilling spacing is tens of meters.
B.
The important pipeline to protect the outlet pipeline of Wangjiatang pump station needs to pass through the pipelines of PetroChina and west to east gas transmission, so as not to be heavy To cross pipelines, after accurate exploration and measurement, the buried depth of the pipeline is further reduced by 5m to ensure a safe distance of more than 3m from important pipelines, and a series of protective measures such as emergency plan are prepared simultaneously.
When encountering the upper soft and lower hard strata, due to uneven stress, it is easy to cause cutter head damage and ground collapse, which needs to be pushed carefully or handled in advance.
A.
Geological structure survey and engineering geological survey give us perspective eyes, but we don’t have perspective eyes.
Static cone penetration refers to the use of a pressure device to press the cone rod with a contact probe into the test soil layer.
Borehole sampling exploration uses geological drilling rig to drill deep holes under the surface, and then uses hollow drill bit to take geotechnical samples out of the surface for sampling analysis.
Before the safe and economical construction and excavation of the working well, the buildings, greening and pipelines affecting the construction need to be treated to reduce the impact of construction on traffic.
The water inlet and sludge discharge system is mainly composed of water inlet valve, sludge discharge valve, bypass valve and pipeline.
The control room controls the driving parameters such as jacking force, jacking speed, jacking direction and jacking pressure.
Eliminate all kinds of underground obstacles “Roadblock” there are various obstacles under the ground.
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After the pipeline is installed in place, the water stop rubber ring shall be placed, and the length of each section of pipeline is generally 2-2.5m.
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After sedimentation, it is transported to the designated place for treatment.
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“Steel pangolin” drilling artifact pipe jacking the drilling artifact is called “pipe jacking machine”, which can be unimpeded underground like pangolin! Most of the outlet pressure pipe projects of Wangjiatang pump station are constructed by pipe jacking.
The system converts the soil cut by the cutter head into mud through high-pressure water flow, and then transports it to the ground through mud pipeline.
C.
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Where it is pushed, the long pipe is completed.
Green plants within the scope of greening construction need to be relocated and restored after construction.
B.
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C.
In case of complex geology such as underground karst cave and Boulder, the drilling spacing is reduced to a few meters.
