CN106638258A

CN106638258A - Trough girder

Info

Publication number: CN106638258A
Application number: CN201610948824.0A
Authority: CN
Inventors: 张剑英; 方亚非; 朱鸿欣; 黄振兴
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2016-10-26
Filing date: 2016-10-26
Publication date: 2017-05-10

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

A kind of trough girder

Technical field

The present invention relates to civil Engineering Design technical field, specifically a kind of trough girder.

Background technology

At present, the leap road that China is usually used and the section form that the city superstructure of continuous beam bridge in river course is adopted For box beam, the type beam building height is higher, thus often in order to meet bridge under clear height, clear span require, and to the friendship at this Logical track profile design brings difficulty, and causes engineering cost to increase.Construction of the development in city to Urban Bridge simultaneously is carried The requirement such as attractive appearance, noise reduction environmental protection is gone out, conventional box-type section continuous bridge is increasingly difficult to meet these requirements.

In order to solve an above-mentioned difficult problem, the measures such as reduction box beam height, optimization box girder web shape are employed in the engineering of part, But these measures can only improve and cannot tackle the problem at its root.

The content of the invention

It is an object of the invention to provide a kind of trough girder, this beam type can be effectively reduced constructionheightofbridge, while Ensure the safety of structure.

To realize this purpose, technical scheme is as follows：A kind of trough girder, including one no less than three across company Continuous beam, it is characterised in that along continuous beam length direction, beam section is the combination of grooved or grooved and box, in continuous beam central bearing point Place, beam section is shaped as upper and lower two parts composition, and top is opening trough girder, and bottom is box beam；Extend from central bearing point to both sides Direction, section top grooved depth of beam is constant along beam length direction, and back edge is flushed, and section lower tank depth of beam gradually subtracts Little, i.e., box beam apical margin is flushed along beam length direction, and box beam root edge moves closer to box beam apical margin, across span centre and side in close continuous beam Across end, box beam height down to zero, beam section shape becomes the opening grooved beam section of three road webs and base plate composition.

According to a preferred embodiment of the invention, box beam root edge changes and moves closer to case according to parabola or circular curve smooth-going Back edge.

According to a preferred embodiment of the invention, box beam root edge moves closer to box beam apical margin along broken line form.

According to a preferred embodiment of the invention, the median ventral plate and section bottom box beam of the opening trough girder on beam section top Median ventral plate alignment.

According to a preferred embodiment of the invention, the web of the opening trough girder on beam section top is consolidated with base plate.

According to a preferred embodiment of the invention, the base plate of the opening trough girder on beam section top doubles as section bottom box beam Top board.

Trough girder in the present invention can make in precasting yard segmental machining, and scene is using wet joint, splicing seam or stem grafting Slit formula connects.Can also integrin trough girder pour at the scene.The present invention can be effectively reduced continuous bridge bridge floor to beam bottom Building height, is conducive to the design for having the traffic route vertical section at Clearance requirement under bridge, and then reduces construction costs.The present invention Good looking appearance, is particularly well-suited to the regional track higher to Bridge Landscape, noise control requirement such as inner city, suburb and hands over The bridges such as logical, trolleybus, tramcar, bus rapid transit.Remarkable in economical benefits of the present invention, social benefit is good.

Description of the drawings

Fig. 1 is the elevation of the present invention（By taking 1/2 ter span continuous beam as an example）.

Fig. 2 is the profilograph of the present invention（By taking 1/2 ter span continuous beam as an example）.

Fig. 3 is the plane graph of the present invention（By taking 1/2 ter span continuous beam as an example）.

Fig. 4 is beam section figure at the central bearing point of the present invention.

Fig. 5 be the present invention at span centre and end bay beam-ends beam section figure.

Specific embodiment

A kind of trough girder, including one no less than three across continuous beam, the trough girder by top opening trough girder 1 and under The box beam 2 in portion is constituted, it is characterized by along continuous beam length direction, commensurate structure loading characteristic, beam section is grooved or grooved With the combination of box.At continuous beam central bearing point, beam section is shaped as upper and lower two parts composition, and top is three road webs and base plate The opening trough girder of composition, bottom is box beam, and box beam top board unites two into one with groove-shaped beam bottom plate.From central bearing point to both sides extension side To section top grooved depth of beam is constant along beam length direction, and back edge is flushed.Section lower tank depth of beam is gradually reduced, I.e. box beam apical margin is flushed along beam length direction, and box beam root edge is according to curve（Parabola or circular curve）Or broken line smooth-going change and gradually Near box beam apical margin.Across span centre and end bay end in close continuous beam, box beam height down to zero, beam section shape becomes The opening rectangle and trapezium channel section that three road webs are constituted with base plate.

As shown in Figure 4 and Figure 5, the opening trough girder on section top includes median ventral plate 4 and the side abdomen positioned at median ventral plate both sides Plate 3, the median ventral plate 4 and side web 3 are consolidated with groove-shaped beam bottom plate 5.The box beam of section bottom includes box beam top board 6, case The box beam of type beam base plate 7 and the composition of box beam side web 8, the box beam middle part arranges parallel with box beam side web 8 Box beam median ventral plate 9.

The median ventral plate 4 of the opening trough girder on section top and the alignment of median ventral plate 9 of section bottom box beam, on section Top board 6 of the groove-shaped beam bottom plate 5 in portion as section bottom box beam.

Hc is section top half trough girder deck-molding, and Hx is lower section box beam deck-molding.Along beam length direction, Hc values Constant, Hx values are continually changing and minima is zero.

Claims

1. a kind of trough girder, including one no less than three across continuous beam, it is characterised in that along continuous beam length direction, beam section For the combination of grooved or grooved and box, at continuous beam central bearing point, beam section is shaped as upper and lower two parts composition, and top is to open Mouth trough girder, bottom is box beam；From central bearing point to both sides bearing of trend, section top grooved depth of beam along beam length direction not Become, back edge flushes, section lower tank depth of beam is gradually reduced, i.e., box beam apical margin is flushed along beam length direction, box beam root edge by Gradually near box beam apical margin, across span centre and end bay end in close continuous beam, box beam height down to zero, beam section shape into For three road webs and the opening grooved beam section of base plate composition.

2. a kind of trough girder as described in claim 1, it is characterised in that：At continuous beam central bearing point, the opening on section top The median ventral plate of trough girder and the median ventral plate alignment of section bottom box beam.

3. a kind of trough girder as described in claim 1, it is characterised in that：The web and base plate of the opening trough girder on section top Consolidation.

4. a kind of trough girder as described in claim 1, it is characterised in that：The base plate of the opening trough girder on section top doubles as cutting The top board of face bottom box beam.

5. a kind of trough girder as described in claim 1, it is characterised in that：Box beam root edge becomes according to parabola or circular curve smooth-going Change and move closer to box beam apical margin.

6. a kind of trough girder as described in claim 1, it is characterised in that：Box beam root edge moves closer to box beam top along broken line form Edge.