Guide shield for pushing rectangular concrete frame bridge

Abstract

The invention relates to a guide shield for pushing a rectangular concrete frame bridge, which is characterized in that the front end of a prefabricated rectangular concrete frame bridge is provided with a rectangular metal frame structure, the rear end of the rectangular metal frame structure and the front end of the rectangular concrete frame bridge have the same section dimension, and are mutually engaged into a whole body, four surfaces of the rectangular metal frame structure has a box-shaped structure, an inner cavity of the rectangular metal frame structure is hollow, the periphery of the front end of the rectangular metal frame structure has a wedge-shaped structure, two side plates of the rectangular metal frame structure extend downwards to be in sliding contaction with the outer wall of a bottom plate guide steel tube for pushing the rectangular concrete frame bridge, and grating steel plates which are crisscrossed are uniformly distributed in the hollow inner cavity of thefront of the rectangular metal frame structure, and divide the hollow inner cavity of the front of the rectangular metal frame structure into two-hole, four-hole, six-hole or nine-hole grating units.When the rectangular concrete frame bridge of a railway or a highway subgrade is pushed by the guide shield disclosed by the invention, I-steel, temporary beams and other reinforcement measures or speed limit running are free, so that the defects of the occurrence of landslides or the offset of pushing can be prevented.

Description

technical field [0001] The invention relates to a roadbed excavation equipment for railways or highways, in particular to a guide shield for pushing a rectangular concrete frame bridge or a frame culvert. Background technique [0002] In the construction of road overpass or culvert engineering, it is necessary to jack the prefabricated rectangular concrete frame bridge and pass through the subgrade of the existing railway or road, so as to facilitate the crossing of cars, pedestrians, pipelines and cables. During construction, when the prefabricated rectangular concrete frame bridge is jacked to the soil layer of the subgrade, the soil needs to be dug out continuously before the jacking can continue; in order to maintain the operation of the upper railway or highway, it is usually necessary to use I-beams, beams, etc. Reinforcement measures or speed limit operation, but the end face of the rectangular concrete frame bridge is difficult to cut directly into the soil layer. Wh...

AI Technical Summary

Problems solved by technology

During construction, when the prefabricated rectangular concrete frame bridge is jacked to the soil layer of the subgrade, the soil needs to be dug out continuously before the jacking can continue; in order to maintain the operation of the upper railway or highway, it is usually necessary to use I-beams, beams, etc. Reinforcement measures or speed limit operation, but the end face of the rectangular concrete frame bridge is difficult to cut directly into the soil layer. When the cross section of the rectangular concrete frame bridge is large, the exposed area of ​​the subgrade soil layer is also large, which is prone to landslides and cause safety accidents; Traditional reinforcement methods during construction can no longer meet the requirements of continuously increasing high-speed railway and expressway operations

In addition, when jacking a prefabricated rectangular concrete frame bridge, the guide steel pipe disclosed in the utility model patent "a guide device for jacking the bottom plate of the frame bridge" is adopted. When jacking, the bottom plate of the prefabricated rectangular concrete frame bridge is placed on the pre-embedded on the guide steel pipe; although the pre-buried guide steel pipe can reduce the resistance of the jacking frame bridge and prevent the sinking or lifting of the front end, it is still prone to deviation in the horizontal direction

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