One-time continuous forming and pouring method for ultralong post-poured fish ridge wall and ultralong fish ridge wall

Abstract

The invention discloses a one-time continuous forming and pouring method for an ultralong post-poured fish ridge wall and an ultralong fish ridge wall. The method comprises the following steps of arranging an anti-cracking steel bar mesh at an abrupt change position on the section of the side surface of the fish ridge wall, and performing layered casting on the fish ridge wall by concrete, further comprises the steps of S1, retaining part of box type bridge panel steel strand, and tensioning the box type bridge panel steel strand after the first layer of concrete of the fish ridge wall is cast; S2, arranging a temporary construction steel strand in the fish ridge wall; S3, reinforcing the side surface of the concrete at the combined position of the fish ridge wall during layered casting; S4, doping a proper amount of superfine slag powder and coal ash into the concrete for casting the fish ridge wall; S5, carrying out once continuous pouring by a slantways segmenting and horizontal layering method. According to the method, the cracking resistance of a concrete block body of the fish ridge wall under external restraint stress can be enhanced, and the aim of preventing or controlling temperature cracks is fulfilled.

Description

technical field [0001] The invention relates to a bridge construction technology, in particular to a one-time continuous forming pouring method of an ultra-long, post-cast fish-ridge wall and an ultra-long fish-ridge wall prepared by the method. Background technique [0002] The long-span concrete fish ridge continuous girder bridge (main span 158m) is a down-supported structure, and the fish ridge wall is added to the box bridge deck as the main force-bearing member, which is an improvement on the traditional long-span variable-height prestressed concrete continuous girder bridge. A breakthrough and improvement of the model. [0003] During construction, the fish ridge wall (about 60m in length) at the top of the main pier often needs to be poured on the box bridge deck after the cantilever reaches a certain length (the age difference is about 5 months). At this time, due to the high grade of concrete (C55), and the shrinkage and creep of the contoured box bridge deck has ...

AI Technical Summary

Problems solved by technology

However, if we refer to the current few projects and set up temporary expansion joints, that is, post-casting joints (with a distance of 10m to 30m), however, this will not only be troublesome to construct, but also easy to leak

Especially when the concrete construction technology is changed from semi-mechanized to modern pumping technology, due to the large water-cement ratio, high sand content, large amount of cement, and fast pouring speed, the difficulty of crack control also increases. structural durability

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