Non-excavation type laying construction method of large-pipe-diameter pipeline of heat supply network

Abstract

The invention discloses a non-excavation type laying construction method of a large-pipe-diameter pipeline of a heat supply network. The method comprises the steps that drilling machine equipment is selected, the pull strength of a selected horizontal directional drilling machine needs to meet the requirement of the directional drilling penetration length, the pull strength is larger than or equalt 3*(the friction resistance generated by the pipeline in a hole and the viscous comprehensive friction resistance of the pipeline in the hole), 3 times of the safety coefficient is taken, and mud preparing, guide hole drilling, hole pre-expanding, pipe penetration treatment and pulling back are carried out. Compared with the pipe jacking construction manner, the method has the following advantages that long-distance uninterrupted penetration construction of the pipeline can be met, and the construction speed is high; destroy to the ground environment can be reduced, and the requirement of environment protection can be met; the method is not disturbed by uncertain factors such as the soil property, underground water and underground hidden pipelines, the procedures of work well construction and work pipe penetration are omitted, and time is saved; and long-distance welding and heat preservation can be carried out on the work pipe on the ground, the penetration depth is large, and the risk such as water penetration and pipe floating during river penetration is avoided.

Description

Technical field: [0001] The invention relates to a non-excavation laying construction method of a large-diameter heating network pipeline, which belongs to the technical field of pipeline crossing construction. Background technique: [0002] Large-diameter heating network pipelines encounter construction problems caused by complex geological conditions when passing through urban rivers and road projects, and how to ensure that the construction technology meets the construction requirements of the project has become a problem that needs to be solved at present, which is different from traditional trenchless pipe jacking construction. Compared with other methods, due to the unique characteristics of the construction environment of the pipeline crossing project, the pipeline crossing construction of the large-diameter heating network must be carried out in combination with the hydrogeological conditions. In the face of a series of problems brought about by the complex geological...

AI Technical Summary

Problems solved by technology

Therefore, under the environmental conditions of quicksand geology and shallow groundwater level for large-diameter heating network pipelines, caisson pipe jacking construction technology cannot guarantee that the structures on the ground will not be affected. further research on the application of