Construction method for huge capping beam utilizing reinforced concrete thin wall as permanent formwork

Abstract

A construction method for a huge capping beam utilizing a reinforced concrete thin wall as a permanent formwork comprises the following steps: (1), prefabricating and forming a center block thin wall, a left block thin wall and a right block thin wall in a prefabricating field; (2) conveying the prefabricated thin walls to a construction field; and (3), performing hoisting, fitting installation and internal concrete pouring in the field. The step (3) particularly comprises the following steps of (A) hoisting the center block thin wall to the position of a pier top; (B) binding reinforcing steel bars in the center block thin wall and then pouring concrete; (C) hoisting the left block thin wall and the right block thin wall, aligning the left block thin wall and the right block thin wall with the center block thin wall, then smearing epoxy resin on abutted surfaces, respectively arranging temporary prestressed tendons and oppositely pulled prestressed tendons on the outer sides and the tops of the thin walls and tensioning the oppositely pulled prestressed tendons; and (D) tensioning the temporary prestressed tendons, then binding reinforcing steel bars in the left block thin wall and the right block thin wall, and performing concrete pouring. The construction method can simultaneously guarantee hoisting ability, little influence on field environments and structural attractiveness.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a giant cap beam using reinforced concrete thin walls as permanent templates. Background technique [0002] Most of the bridges built in my country are simply supported girder bridges. Simply supported girder bridges are generally equipped with cover beams on the top of pier columns, and the cover beams are used as the supporting platform of the beam slab. Therefore, the cover girders are the main force-bearing components of simply supported girder bridges. . Usually, the construction of the cover beam is generally realized by pouring concrete on site, or hoisting in place after the overall prefabrication. [0003] With the increasing requirements of urban construction, the appearance of the cast-in-place structure itself cannot meet people's visual requirements, and there are still problems such as large land occupation, high risk and seriou...

AI Technical Summary

Problems solved by technology

This construction method solves the traffic problem caused by the land occupation of the bracket, the construction period is short, and the impact on the site environment is also small. Although the hoisting after the overall prefabrication can well ensure the appearance and the site environment, it is greatly affected by the hoisting capacity

In some cities, the cover beams of multi-lane elevated roads need to be set to more than 30 meters across the bridge to meet the needs of the lanes, and the width along the bridge is only about 1 / 10 of the length of the transverse bridge. The structure is generally prestressed steel Concrete, with a weight of about 1000t, and a large aspect ratio of the structure, makes hoisting more difficult. This construction method is increasingly limited by transportation facilities and hoisting space, and its applicability is limited

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