CN103696374B - Horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method - Google Patents

Horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method Download PDF

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Publication number
CN103696374B
CN103696374B CN201310726919.4A CN201310726919A CN103696374B CN 103696374 B CN103696374 B CN 103696374B CN 201310726919 A CN201310726919 A CN 201310726919A CN 103696374 B CN103696374 B CN 103696374B
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China
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cantilever
curve
erection
main truss
span
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CN201310726919.4A
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CN103696374A (en
Inventor
高宗余
徐伟
肖海珠
张燕飞
彭振华
侯健
梅新咏
徐力
郑清刚
龚俊
张建强
胡文军
罗扣
何东升
张金涛
苑仁安
王恒
刘厚军
唐斌
戴慧敏
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China Railway Corp
China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
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China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
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Abstract

The present invention relates to a kind of horizontal curve section greatly across freely-supported steel trussed beam cantilever erection method, according to position on horizontal curve of radius of horizontal curve, bridge span structure and main truss distance computation cantilever span curve medial and lateral main truss rod member and anchoring across curve medial and lateral main truss rod member length; By cantilever span curve medial and lateral main truss member erection to the permanent support position of N Dun Ding, interim connecting structure is adopted permanent for Dun Ding bearing and anchoring to be linked together across curve medial and lateral main truss rod member, along design axis cantilever jointing steel beam column part; After spanning erection is in place, remove interim connecting structure.The present invention successfully avoid girder steel lateral pushing in work progress with regard to bit manipulation, simplifies working procedure.Adopt the present invention, can to make on curved section large simplifies greatly across the construction of freely-supported steel truss girder bridge cantilever erection, stressed reliable, easy construction, simple to operate, reduce pier top temporary construction facility and site work amount, accelerating construction progress greatly, saves construction cost, remarkable in economical benefits.

Description

Horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method
Technical field
The present invention relates to a kind of horizontal curve section greatly across freely-supported steel trussed beam cantilever erection method.
Background technology
The length of current highway, railroad bridge building project generally all more than several kilometers, even tens kilometers, due to the demand of beam section wiring, so long circuit can not all on straightway, and therefore a large amount of non-navigation bridges may be disposed on curved section.For the difficulty reducing design, manufacture and construct, generally by the structure design section of being in line of multispan freely-supported, on horizontal curve, " to roll over Dai Qu " carries out span distribution.For large across freely-supported steel truss girder bridge, free cantilever erection is a kind of economically viable method, is widely adopted in construction.But when steel truss girder bridge is disposed on horizontal curve, can there is a drift angle between adjacent axis, traditional free cantilever erection will make cantilever span depart from its center line in work progress, can be with the problem of serving like this:
(1) interim fulcrum need be set up at Dun Ding: due to adjacent across axis between there is angle, during cantilever erection, front end fulcrum and anchoring fulcrum all can off-design positions, so must arrange interim fulcrum in addition at each Dun Ding.
(2) lateral pushing operation need be carried out: after cantilever erection to interim fulcrum, the operation of lateral pushing adjustment axis need be carried out, make bridge span structure in place, so just must be equipped with corresponding lateral pushing equipment and device, corresponding bridge pier size will increase thereupon.
(3) loop wheel machine safety is affected: during lateral pushing operation, loop wheel machine is still on bridge span structure, and its construction safety performance is affected.
Longspan steel truss girder crane span structure on curved section is established, also has some good tries at present, such as: before free cantilever erection, anchoring is adjusted a suitable angle across beam-ends, reduce the lateral pushing shift value of structure after assembled completing; Lay slide plate at N+1 Dun Ding, reduce lateral pushing power etc.These methods can reduce the difficulty of constructing to a certain extent, but cannot from the problem solved in fact because axis runout brings.
Summary of the invention
The object of the invention is for above-mentioned present situation, aim to provide and a kind ofly fundamentally can solve the problem of cantilever bridge across axis runout, construction speed is high, and easy construction, cost are low, can stablize, efficiently in curved section erection greatly across the method for freely-supported steel trussed beam cantilever.
The object of the invention is to be achieved through the following technical solutions, horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method, and concrete steps are as follows:
1) geometrical relationship is utilized to calculate cantilever span curve medial and lateral main truss rod member and the anchoring length across curve medial and lateral main truss rod member according to position on horizontal curve of radius of horizontal curve, bridge span structure and main truss spacing, in the plane, outside cantilever span curve, the length of main truss rod member is greater than the length of the inner side of curve main truss rod member;
2) by cantilever span curve medial and lateral main truss member erection to the permanent support position of N Dun Ding, adopt interim connecting structure permanent for Dun Ding bearing and anchoring to be linked together across curve medial and lateral main truss rod member;
Interim connecting structure is the scab with knuckle, and knuckle equals cantilever span girder center line and anchoring across the drift angle between girder center line;
3) adjust the traveling speed in outside in loop wheel machine, after making loop wheel machine turn over corner α, run on cantilever span rod member, along bridge axis free cantilever erection steel truss girder;
Described corner α is that anchoring is across the angle between axis and cantilever span axis;
4) cantilever end fulcrum is dropped on the permanent bearing of N+1 Dun Ding, remove interim connecting structure;
Rod member is assembled to N+1 Dun Ding, acts directly on permanent bearing; Remove N Dun Ding to connect temporarily, complete this and construct across the free cantilever erection of structure.
The present invention successfully avoid girder steel lateral pushing in work progress with regard to bit manipulation, can reduce pier top temporary construction facility and site work amount; After structure free cantilever erection is in place, each pier top position of the fulcrum all without the need to adjustment, simplifies working procedure.
To the invention enables on curved section large simplifies greatly across the construction of freely-supported steel truss girder bridge cantilever erection, stressed reliable, easy construction, simple to operate, and accelerating construction progress, saves construction cost, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is free cantilever erection floor map,
Fig. 2 is N pier top close-up schematic view,
Fig. 3 is novel interim splicing structure close-up schematic view.
Detailed description of the invention
With reference to the accompanying drawings 1,2,3, in conjunction with the concrete steps of horizontal curve section freely-supported steel trussed beam cantilever erection method, elaborate the present invention.
1) according to position on horizontal curve of radius of horizontal curve, bridge span structure and main truss distance computation cantilever span curve medial and lateral main truss rod member and the anchoring length across curve medial and lateral main truss rod member.
Long+1/2 × sin α × main truss spacing of main truss rod member length outside curve=internode
Long-1/2 × sin α × main truss spacing of the inner side of curve main truss rod member length=internode
In the plane, outside cantilever span curve, the length of main truss rod member is greater than the length of the inner side of curve main truss rod member, and its difference is sin α × main truss spacing;
2) main truss rod member 1, cantilever span the inner side of curve main truss rod member 3 outside cantilever span curve are lifted to N Dun Ding permanent bearing 6 position, adopt interim connecting structure 5 permanent for Dun Ding bearing and anchoring to be linked together across the inner side of curve main truss rod member 4 across main truss rod member 2, anchoring outside curve;
Interim connecting structure 5 is the scab with knuckle, and knuckle equals cantilever span girder center line and anchoring across the drift angle between girder center line;
3) adjust the traveling speed in outside in loop wheel machine, after making loop wheel machine turn over corner α, run on cantilever span rod member, along bridge axis 7 free cantilever erection steel truss girder; In cantilever erection process, cantilever bridge axis is all the time along design axis direction.
Described corner α be anchoring across the angle between axis 9 and cantilever span axis 7, this corner is that the span distribution (i.e. " to roll over Dai Qu ") on curved section being designed to straightway produces.The present invention successfully overcomes this corner, makes the free cantilever erection construction of cantilever span all the time along axis direction.Otherwise, after steel girder erection is in place, corner α must be eliminated by lateral pushing.
4) cantilever end fulcrum is dropped on the permanent bearing 8 of N+1 Dun Ding, remove interim connecting structure;
N+1 Dun Ding is equally without the need to arranging interim fulcrum, and cantilever span rod member is assembled to N+1 Dun Ding, can act directly on permanent bearing.Remove N Dun Ding to connect temporarily, complete this and construct across the free cantilever erection of structure.
The present invention is in whole free cantilever erection process, and do not arrange any interim fulcrum, cantilever bridge all adopts permanent bearing across N, N+1 Dun Ding.The spanning completing free cantilever erection, without the need to carrying out any pushing tow and bearing adjustment operation, can be constructed across the cantilever erection participating in next spanning as anchoring immediately.

Claims (5)

1. horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method, it is characterized in that concrete steps are as follows:
1) geometrical relationship is utilized to calculate cantilever span curve medial and lateral main truss rod member and the anchoring length across curve medial and lateral main truss rod member according to position on horizontal curve of radius of horizontal curve, bridge span structure and main truss spacing, in the plane, outside cantilever span curve, the length of main truss rod member is greater than the length of cantilever span the inner side of curve main truss rod member;
2) by cantilever span curve medial and lateral main truss member erection to the permanent support position of N Dun Ding, adopt interim connecting structure permanent for Dun Ding bearing and anchoring to be linked together across curve medial and lateral main truss rod member;
Interim connecting structure is the scab with knuckle, and knuckle equals cantilever span girder center line and anchoring across the drift angle between girder center line;
3) adjust the traveling speed in outside in loop wheel machine, after making loop wheel machine turn over corner α, run on cantilever span rod member, along bridge axis free cantilever erection steel truss girder;
Described corner α is that anchoring is across the angle between axis and cantilever span axis;
4) cantilever end fulcrum is dropped on the permanent bearing of N+1 Dun Ding, remove interim connecting structure;
Rod member is assembled to N+1 Dun Ding, acts directly on permanent bearing; Remove N Dun Ding to connect temporarily, complete this and construct across the free cantilever erection of structure.
2. horizontal curve section according to claim 1 is greatly across freely-supported steel trussed beam cantilever erection method, it is characterized in that the length of spanning end main truss rod member is according to the position of bridge span structure on horizontal curve and main truss line space design.
3. horizontal curve section according to claim 1 is greatly across freely-supported steel trussed beam cantilever erection method, it is characterized in that there is angle between the axis of anchoring across cantilever span, adopt the interim connecting structure of band knuckle to complete anchoring and be connected across with the interim of main truss rod member between cantilever span.
4. horizontal curve section according to claim 1 is greatly across freely-supported steel trussed beam cantilever erection method, it is characterized in that cantilever bridge all adopts permanent bearing across N, N+1 Dun Ding in whole free cantilever erection process.
5. horizontal curve section according to claim 1 is greatly across freely-supported steel trussed beam cantilever erection method, it is characterized in that in cantilever erection process, cantilever bridge axis across all the time along design axis direction.
CN201310726919.4A 2013-12-25 2013-12-25 Horizontal curve section is greatly across freely-supported steel trussed beam cantilever erection method Active CN103696374B (en)

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CN107974917B (en) * 2017-11-15 2019-04-16 中铁大桥勘测设计院集团有限公司 A kind of bending node, curve continuous steel girder bridge and its design method
CN109537800A (en) * 2018-11-30 2019-03-29 中国建筑第八工程局有限公司 Super-span overhangs prestressed arc-shape steel beam structure and its construction method
CN111501564A (en) * 2020-04-22 2020-08-07 中交第三航务工程局有限公司 Corner arc track arrangement process

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Effective date of registration: 20151221

Address after: 430050 Hanyang Road, Hubei, Wuhan, No. 34

Patentee after: China Zhongtie Major Bridge Reconnaissance & Design Institute Co., Ltd.

Patentee after: CHINA RAILWAY CORPORATION

Address before: 430050 Hanyang Road, Hubei, Wuhan, No. 34

Patentee before: China Zhongtie Major Bridge Reconnaissance & Design Institute Co., Ltd.