Pneumatic development machine for replacement of existing concrete conduit and replacing method therefor

Abstract

The pneumatic boring machine used to update the existing concrete pipeline has a machine head and a cutterhead at the excavation end, and the feature is that the machine head and the cutterhead are wheel-shaped head and wheel-shaped cutterhead with a central opening, and its inner diameter is larger than that of the existing concrete pipeline. Outer diameter; the tunnel boring machine is provided with an air pressure machine room, which is connected with an air compressor, and the front and rear parts of the air pressure machine room are respectively equipped with air lock devices. The optimization scheme includes: the rear of the main body of the roadheader is fixedly connected with the pneumatic machine room and the semi-shield machine through pins; at the same time, the half-shield jack is also fixedly connected with several newly laid pipes at the rear; the roadheader is equipped with drainage pipe, the drainage pipe extends in the existing concrete pipe and runs through the main body of the roadheader, the pneumatic machine room and the semi-shield machine. The present application also provides a method for renewing existing concrete pipelines using the pneumatic boring machine. The invention can allow operating machines or operators to enter and exit, maintain a dry working space in the boring machine, and can effectively and conveniently renew existing concrete pipelines.

Description

technical field [0001] The present invention relates to a pneumatic tunneling machine for updating existing concrete pipelines, and a method for updating existing concrete pipelines by using the pneumatic boring machine, in particular to a method for breaking rainwater drainage pipes or sewers buried in the ground. Concrete pipes are provided, and a pneumatic boring machine and method thereof are used for simultaneously laying new pipes. Background technique [0002] Existing TBMs for updating existing concrete pipelines, like full-face TBMs, are equipped with rotating excavating teeth over the entire excavation section, and use a non-excavation method to break existing concrete pipelines and lay new pipelines thereafter. The updating method of the existing underground pipeline is to keep the old pipeline buried in the ground, surround the ring-shaped space formed by the original excavation of the old pipeline, and bury a new pipeline in the space. However, although the abo...

AI Technical Summary

Problems solved by technology

However, while the aforementioned full-face excavators can cut mild steel (SS400) reinforcement, they cannot cut strong PC steel or the interface steel of existing concrete pipes, which would entangle the cutter and interrupt the operation to remove them

In addition, when crushing old existing concrete pipes laid by excavation methods in the past, since sleepers, etc. were buried as foundations under the old existing concrete pipes, if the milling cutter of a full-face excavator was used to crush the foundation part, the foundation part would vibrate and cause damage. Creates mud that can sink existing concrete pipes and make them difficult to break with milling cutters

Also, groundwater infiltration from around existing concrete pipes can make excavation difficult for full-face excavators

In addition, when the old pipeline has a branch or a working opening, it cannot be excavated

Under the geological conditions with low N value, the old pipeline has been sinking or rising for many years, so it will be guided to the wrong direction by the old pipeline. When the above-mentioned underground pipeline renewal method is used to lay new pipelines, operational difficulties will also occur. The problem

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