Triangular area construction method of open-web rigid frame bridge

Abstract

The invention relates to the technical field of open-web rigid frame bridge construction, and discloses a triangular area construction method of an open-web rigid frame bridge, which comprises the following steps: mounting a lower chord starting section bracket at the top of a concrete pier column, pouring a 0th lower chord section, and dismounting the lower chord starting section bracket after the 0th lower chord section reaches self-stabilizing strength; pouring the lower chord sections symmetrically to the two sides in sequence, and meanwhile heightening the concrete pier column on the upper surface of the 0th lower chord section; heightening the concrete pier column to a designed height, mounting an upper chord starting section bracket at the top of the concrete pier column, pouring a 0th upper chord section, and dismounting the upper chord starting section bracket after the 0th upper chord section reaches self-stabilizing strength; pouring the upper chord sections symmetrically to the two sides in sequence; and when the nth lower chord section and the nth upper chord section are poured, performing closing, and forming a triangular area. According to the triangular area construction method, the upper chord and the lower chord are independently and separately constructed and do not interfere with each other, triangular area stress is simple, construction difficulty is small, and construction efficiency is high.

Description

technical field [0001] The present application relates to the technical field of construction of hollow rigid frame bridges, in particular to a construction method for the triangular area of ​​hollow rigid frame bridges. Background technique [0002] The economically applicable span of prestressed concrete continuous rigid frame bridge is about 60-200m. When the span exceeds 200m, it is prone to defects such as mid-span deflection, beam deformation and cracking, which seriously affects the service life and durability of the bridge. , limiting the spanning capacity of continuous rigid frame bridges. Prestressed hollow continuous rigid frame bridge, as a kind of bridge to improve the shortcomings of traditional continuous rigid frame and improve the spanning capacity, has been put into practice in recent years. The prestressed hollow continuous rigid frame bridge adopts the upper and lower chord box girders instead of the traditional high web structure, which reduces the dead...

AI Technical Summary

Problems solved by technology

[0004] After the construction of the initial segment of the lower string is completed, it must be stopped for a long time. The construction work of the subsequent segment of the lower string can only be carried out after the construction of the initial segment of the upper string is completed. The waiting period for the construction of the lower string is longer; There are many conversions and the construction period is long; the bracket is erected on the lower string segment to support the upper string segment, the amount of support is large, the installation and disassembly are difficult, the construction period of a single segment is prolonged, and there is a problem of interference between the upper and lower string construction, resulting in a longer construction period. The force is complex and the construction control is difficult

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