Now there is no need to dig trenches for buried pipelines. Instead, use a machine to directly drill in and then pull out the pipe. How does this work?

This method is called trenchless pipe laying technology, and the machine used is called trenchless pipe laying rig. This method is to lay, maintain and update all kinds of underground pipelines in a large area without destroying the ground, and is widely used in the construction of new pipelines and the repair of old pipelines in the fields of water supply, drainage, electric power, communication and gas.

Its characteristic is that it can cross railways, highways and buildings in a large area without digging or destroying the ground, and it is a safe and effective construction technology. In this way, because the upper soil layer is not destroyed, the pipeline is not easy to deform, the service life of the pipeline is greatly enhanced, and the relocation cost can be greatly reduced because there is no need to destroy the surface and its buildings in a large area.

Extended data:

Several noticeable problems in the application of trenchless buried pipe technology;

1. The engineering geological and hydrogeological conditions change frequently along the soil layer of the pipeline, so it is necessary to know the changes of the soil layer before the pipe jacking construction. In addition, the sections that need to be backfilled need to be reinforced in advance to prevent the surface from sinking too much after pipe jacking construction.

2. Detection and protection of toxic gases The stratum of pipe jacking construction generally passes through the silt layer, and rotten animals and plants will form toxic gas aggregates underground, which will endanger the health and life of construction workers. Therefore, when the pipe jacking is operated by someone, it is necessary to regularly monitor the toxic gas content in the pipeline and adopt ventilation devices to solve it.

3. Exploring the underground pipeline in advance Although the advanced pipe jacking equipment has the ability to explore the pipeline with shorter route in construction, it is still worthwhile to explore the underground pipeline in advance on the ground, which is still necessary to ensure the safe operation of other pipelines such as communication, electricity, water supply, drainage and gas, and to ensure the normal life of the public.

4. Exploring the foundation when crossing the building When the pipe jacking is under the building foundation, it is necessary to clarify the foundation types encountered on the construction route, and underpinning reinforcement measures can be taken for some foundation pipe jacking.

5. Jack-up calculation One of the jack-up calculations includes accurately calculating the jack-up thrust, selecting the corresponding cylinder type according to the calculation results, and determining the distribution between relays; The second is the design that works well. According to the calculated maximum jacking force, the reinforcement scheme of working well is put forward.

References:

Baidu encyclopedia _ trenchless pipe jacking construction