Arch frame capable of adapting to various arch ring shape parameters

Abstract

The invention discloses an arch frame capable of adapting to various arch ring shape parameters, belonging to the technical field of construction of a reinforced concrete arch bridge. The arch frame is characterized in that triangular brackets of one standard specification and lower chord rods of two or three specifications are used for approximately fitting an ideal arch frame line shape, the error between an upper chord node of the arch frame and an ideal axis node is not more than 5 centimeters; and the arch frame is constructed according to the following steps of: constructing an arch seat, and a fastening stay vertical post; selecting the standard triangular brackets and the lower chord rods with different specification lengths for splicing; pulling the buckling cable when the standard triangular bracket and the lower chord rods are spliced at a certain position; continuously splicing the triangular brackets and the lower chord rods until the triangular brackets and the lower chord rods are folded; disassembling a buckling cable device and performing a load test; pouring arch rings according to a sequence; and disassembling the constructed arch frame and constructing other parts of the arch bridge. The arch frame has the advantages that the arch frame approaches the design line shape of a main arch ring after being spliced, a steel tube support on the arch frame is eliminated, the construction is convenient, and the construction period is shortened; the arch frame is reasonable in force bearing and simple in structure; joints are all connected in the traditional pin connection manner; the connection is convenient, and power transfer is reliable; and steel consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of reinforced concrete arch bridge construction, and relates to the design of a construction arch frame of a concrete arch bridge, in particular to the construction of a reinforced concrete box-type arch bridge with a large span spanning deep valleys and rivers. Background technique [0002] At present, the practice of constructing arch frames of suspended arch bridges includes: [0003] 1. Use June 4th military beams to splice into arc-shaped construction arches, then set up steel pipe supports on the arc arches, adjust the elevation and lay formwork to carry out arch ring construction. The military beam arch frame has the characteristics of high rigidity, small deformation, easy to grasp and control; the general military beam arch frame is easy to obtain, can be reused, and has low cost; at the same time, this kind of construction arch frame is easy to splice and disassemble, which can speed up the constru...

AI Technical Summary

Problems solved by technology

However, this method needs to use more clips and pads, and there are more gaps between the clips and pads, the inelastic deformation of the structure is large, and the conversion of the tension and compression force of the lower chord can also lead to a large non-elastic deformation. Elastic deformation, the force is not as reliable as the direct pin connection

[0007] Among the above methods, methods 1 and 2 use standing trusses for assembly, but the construction arch line cannot meet the requirements of the arch ring, and a large number of steel pipe supports need to be erected, which increases the construction load and construction period. In method 2, the arch is stressed Relatively uneven; methods 3 and 4 adjust the length of the upper and lower chords to meet the arch ring shape, but the structure of the connection end is more complicated, the amount of steel used is larger, and the force is not as reliable as direct pin connection

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