Concrete box girder internal mold disassembly-free supporting system and construction method

Abstract

The invention provides a concrete box girder internal mold disassembly-free supporting system and a construction method. The supporting system comprises an angle steel supporting frame, a transverse support, a longitudinal support and studs. The construction method comprises the steps that firstly, bottom flange steel bars of a concrete box girder are bound, the manufactured supporting system is placed on the bottom flange steel bars, protective layer cushion blocks are arranged between the supporting system and the bottom flange steel bars, the lower studs of the supporting system are embedded into the bottom flange steel bars of the concrete box girder, the supporting system and the bottom flange steel bars are firmly fixed, then web steel bars of the concrete box girder are bound, segmented binding and segmented pouring are conducted on the web steel bars, during pouring, the studs of the supporting system are poured into the concrete, and the technical problems that an inner cavityspace of the concrete box girder is narrow, mold erecting difficulty is large, and an internal mold in a closed space is difficult to detach after concrete pouring are solved.

Description

technical field [0001] The invention relates to a support system and a construction method for a concrete box girder inner form without dismantling. Background technique [0002] At present, the formwork of the inner cavity of the box girder mainly adopts wood formwork and steel formwork. Due to the narrow space of the inner cavity of the general box girder, it is relatively difficult to implement the above two formwork support methods. The wooden formwork has great flexibility, but its rigidity is small. In the high-height box girder formwork, the ability to resist lateral pressure is small, and the wooden formwork is easy to rot and termites are easy to breed, which affects the use function and safety of the building. The steel mold has high rigidity, but little flexibility and high cost, and the weight of the steel mold is heavy, which makes the construction inconvenient, especially when the inner formwork of the concrete box girder is formed, the box girder forms a clos...

AI Technical Summary

Problems solved by technology

The wooden formwork has great flexibility, but its rigidity is small. In the high-height box girder formwork, the ability to resist lateral pressure is small, and the wooden formwork is easy to rot and easy to breed termites, which affects the use function and safety of the building.

The steel mold has high rigidity, but low flexibility and high cost, and the weight of the steel mold is heavy, which makes the construction inconvenient, especially when the inner formwork of the concrete box girder is formed, the box girder forms a closed space, and the inside The removal of the formwork is very difficult. Even if the inner cavity of the box girder is large enough, workers can be organized to remove it, but the material transportation is manual handling, and the construction efficiency is low.

When the inner cavity space of the box girder is small, the inner formwork is generally left in the cavity without dismantling. Since the steel formwork is relatively heavy, the load of the structure will be increased without dismantling, but the additional load of the steel formwork is not considered in the general design , will affect the safety of the structure, and the cost of the steel formwork is relatively high, which is unreasonable economically. Therefore, there is an urgent need for a concrete box girder inner formwork support system that does not need to be dismantled

Images