Method for preventing box culvert head drop during box culvert jacking construction and used steel ship bow slope

Abstract

The invention discloses a method for preventing box culvert head drop during box culvert jacking construction and a used steel ship bow slope, belonging to the technical field of box culvert jacking construction. The method adopts the technical scheme of arranging the steel ship bow slope fixedly connected with the bottom of a bottom plate of the box culvert on the front end bottom plate of the box culvert. During box culvert jacking, a head-up moment is formed by subgrade reaction produced by pushing away soil on the lower slope by using the ship bow slope, so that the box culvert stays in ahead-up state in the jacking process, and the head drop of the box culvert during jacking is prevented. The steel ship bow slope adopts the technical scheme of comprising a bottom steel plate (1) with a straight section and an upward bending arc section and a front steel plate (4) arranged on the front end of the arc section of the bottom steel plate (1) and fixedly connected with the front end. At least one bottom anchoring rib (2) for being fixed on the bottom of the bottom plate of the box culvert is fixedly arranged on the bottom steel plate, and a front reserved rib for being fixed on the front edge of the bottom plate of the box culvert is fixedly arranged on the front steel plate (4).

Description

technical field [0001] The invention relates to a box culvert jacking construction technology, in particular to a method for preventing the box culvert from bowing during the box culvert jacking construction. The present invention also relates to the steel bow ramp used to prevent the box culvert from "heading" during the jacking process. Background technique [0002] Box culvert jacking is widely used in various projects such as railways, highways, and municipal projects. During the jacking process of the box culvert, the phenomenon of lowering the head usually occurs due to the force of the foundation, the front soil body or the quality of the bottom plate of the box culvert itself, commonly known as "heading", which affects the safety and quality of the project. [0003] In order to prevent the problem of tie-in, usually a certain upward slope is reserved for the box culvert or the skateboard in the working pit, so that there is a reserved height when the box culvert pus...

AI Technical Summary

Problems solved by technology

However, in relatively soft ground, the bottom plate of the box culvert will "eat soil" during jacking, which will still cause the phenomenon of "head sticking", which will affect the safety and quality of the project

However, the upward slope reserved during the prefabrication process of the slide plate and box culvert is often uncontrollable and easily deformed, causing problems in the later jacking operation, but it cannot effectively control the construction quality of the jacking operation; secondly, due to the weight of some box culverts Larger, the strength of the slope reserved on the concrete surface is not enough. During the jacking process, due to mutual extrusion and friction, it is easy to be damaged or destroyed, and the intention of the reserved upward slope cannot be achieved.

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