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

Abstract

The invention relates to an air-pressure tunneller for breaking concrete tube, which has a head and a knife disk its front. It is characterized in that: said head is a wheel head with central cut and said knife disk is a wheel knife disk with a central cut and mounted with several rotational hob cutters, while their inner diameters are larger than the outer diameter of concrete tube; the invention has one air-pressure room connected to the air compressor while its front and back parts are both mounted with air locker. The inventive improvement comprises: the back of main body is fixed with the air-pressure room and the semi-shield machine via pins; the semi-shield jack is fixed with several back new tubes via pins; the invention also contains discharge tube that extending in the concrete tube and through the main body, air-pressure room and the semi-shield machine. The invention also provides a relative method to refresh the concrete tube. With said invention, workers can enter into the tube.

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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