Method for transforming rigid-framed arch bridge deck slab without supports

Abstract

The invention belongs to the technical field of bridge and road construction and particularly relates to a method for transforming a rigid-framed arch bridge deck slab without supports. The method comprises the steps as follows: (a) dismounting an original bridge deck slab, breaking a bump on the top of an arch rib and exposing a stirrup in the bump; (b) mounting angle steel and a triangular support in proper positions on the side surface of the arch rib, placing square wood bars on the angle steel and the triangular support, placing bridge deck slab bottom molds above the square wood bars, and arranging cushion blocks between the bottom molds and the square wood bars; (c) laying rebars on the bottom molds, and pouring bridge deck slab concrete; (d) dismounting formworks and a support system after the bridge deck slab concrete reaches designed strength. The transforming method has the advantages that the supports are not needed to be erected from the riverbed bottom surface, construction is convenient, the transformation integrity of the rigid-framed arch bridge deck slab is good and the like, the defects that large-span rigid-framed arch bridge deck slab supports are difficult to erect and are even incapable of being erected during transformation are overcome, the bearing performance of a bridge can be improved, and the integrity of the bridge deck slab is improved.

Description

technical field [0001] The invention belongs to the technical field of bridge and road construction, and more specifically relates to a method for reconstructing a deck of a rigid frame arch bridge without supports, which can improve the integrity of the deck and the bearing capacity of the bridge, and effectively solve the cracking problem of the deck. Background technique [0002] Rigid frame arch bridge is the arch bridge form commonly used in my country in the early stage. Due to the characteristics of light weight, material saving, low cost and good economic indicators, this bridge type has been widely constructed in China in the 1970s and 1980s. It met the needs of the transportation industry at that time. However, due to the low design load and concrete strength level of the existing rigid frame arch bridge, less reinforcement, weak bridge deck pavement and the original construction method of collecting and distributing, with the increase of traffic volume, especially ...

AI Technical Summary

Problems solved by technology

However, further studies have shown that most of the deck reconstruction methods for rigid frame arch bridges in the prior art require a large number of construction supports to be erected from the bottom of the river bed in order to meet the needs of concrete pouring for the new bridge deck

This construction method not only has a long construction period and high cost, but also needs to build supports from the bottom of the riverbed, which has high risks and is even difficult to implement in deep riverbeds or canyons, so it is necessary to optimize and improve it

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