Hydraulic internal mold template for full-hole prefabricated box girder

Abstract

The invention discloses a hydraulic internal mold template for a full-hole prefabricated box girder. The hydraulic internal mold template comprises end sections, variable sections and middle sections, wherein each section is annularly divided into a top mold and movable molds symmetrically hinged to the two sides of the top mold on the template, each movable mold is formed by sequentially hinging the first movable mold to the Nth movable mold, and each top mold and each movable mold respectively comprise a framework and a panel; the inner surfaces of the panels are completely attached and fixed to the frameworks; and the rotating hinge axis of each movable mold of the variable section is not parallel to the longitudinal axis of the template. The end face of the connecting end of the middle section of each variable section is a step face which sequentially extends towards the middle of the girder by a certain length from the first movable mold to the Nth movable mold, and the extending length of the next movable mold is not smaller than the maximum interference amount of the front movable mold and the space of the corresponding middle section. The variable sections are firstly folded, the outer contour of the part, extending into the middle section space, of each movable mold is smaller than the inner contour of the first movable mold panel after the middle section is folded in place after the mold is folded in place, and the outer contour of the part, extending into the end section space, of each movable mold is smaller than the inner contour of the first movable mold panel after the movable mold of the end section is folded in place.

Description

technical field [0001] The invention belongs to the field of prefabricated formwork for bridges, in particular to a hydraulic internal formwork for prefabricated box beams with whole holes. Background technique [0002] The shape of the inner cavity of the whole-hole precast concrete box girder is usually similar to a shuttle shape, with a large middle part and small ends, and both the middle part and both ends are equal-section sections. The template segments are named as the middle segment and the end segment, and the gradient segment between the middle segment and the end segment is called the variable segment, and the space surrounded by the outer surface of the template corresponding to each segment is named as the end segment. segmental space, variable segmental space and middle segmental space, and in order to achieve the effect of overall demoulding, the contracted formwork of the middle segment and variable segmental internal formwork of the box girder needs to be r...

AI Technical Summary

Problems solved by technology

In this patent, the spacing A is set between the double-hinged lug plates on the top mold of the end segment and the variable segment, and the sliding distance A of the upper and lower movable molds of the end segment relative to the top mold is pulled by an external force after the end segment is closed in place. Then shrink the variable segment. During the contraction of the variable segment, the extrusion force generated between the upper movable die of the variable segment and the unshrunk middle segment pushes the upper and lower movable dies of the variable segment to slide a distance A relative to the top die. In this way, the interference phenomenon between the variable segment and the end segment and the middle segment is avoided. Although this structure can realize the overall demoulding of each segment of the inner mold template, it can only be realized by external force, and the actual operation is more complicated; In addition, when the hinge of the upper movable mold of the variable segment has a concave-convex shape such as a hoisting cap, the sliding will be hindered, and the interference between the upper and lower movable molds of the variable segment and the middle segment cannot be avoided according to the above method. has great limitations

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