Trough girder

Abstract

The invention discloses a trough girder. The trough girder comprises one unit of continuous girders which contain no less than three strides. The trough girder is characterized in that in the direction of the continuous girders, the cross section of the girder is a trough type or a combination of a trough type and a box type, at the central bearing point of the continuous girders, the cross section shape of the girder is composed of two parts of an upper part and a lower part, the upper part is an opening trough girder, the lower part is a box girder, in the extension directions of the two sides from the central bearing point, the height of the trough girder on the upper part of the cross section maintains unchanged in the direction of the girder length, the apical margin of the girder is level, the height of the box girder on the lower part of the cross section gradually decreases, that is, the apical margin of the box girder is level in the direction of the girder length, the bottom margin of the box girder is gradually close to the apical margin of the box girder, at a place which is near to the middle of a middle stride of the continuous girders and the end part of a side stride of the continuous girders, the height of the box girder decreases to zero, and the cross section shape of the girder becomes the cross section of the opening trough girder composed of a three-way web and a baseboard. According to the trough girder, the building height from a bridge surface of a continuous girder bridge to the girder bottom of the continuous girder bridge is effectively reduced, the trough girder is beneficial to the reduction of the weight of the upper part structure of a bridge and is beneficial to the design of a vertical section of a transport line where clearance is required under the bridge, and thus the project cost is reduced.

Description

technical field [0001] The invention relates to the technical field of civil engineering design, in particular to a channel beam. Background technique [0002] At present, the superstructure of urban continuous girder bridges commonly used across roads and rivers in my country adopts box girder cross-section. The design of the longitudinal section of the traffic line here brings difficulties and increases the engineering cost. At the same time, the development of cities has put forward requirements for the construction of urban bridges such as beautiful appearance, noise reduction and environmental protection. It is increasingly difficult for conventional box-section continuous beam bridges to meet these requirements. [0003] In order to solve the above problems, measures such as reducing the height of the box girder and optimizing the shape of the web of the box girder have been adopted in some projects, but these measures can only improve but cannot fundamentally solve th...

AI Technical Summary

Problems solved by technology

[0002] At present, the superstructure of urban continuous girder bridges commonly used across roads and rivers in my country adopts a box-shaped girder cross-section. This type of girder has a high building height. The design of the longitudinal section of the traffic line here brings difficulties and increases the project cost

At the same time, the development of cities has put forward requirements for the construction of urban bridges such as beautiful appearance, noise reduction and environmental protection. It is increasingly difficult for conventional box-section continuous beam bridges to meet these requirements.

[0003] In order to solve the above problems, measures such as reducing the height of the box girder and optimizing the shape of the web of the box girder have been adopted in some projects, but these measures can only improve but cannot fundamentally solve the problem

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