CN103696374A - Straddle method of cantilever of long-span simply supported steel truss beam of horizontal curve section - Google Patents
Straddle method of cantilever of long-span simply supported steel truss beam of horizontal curve section Download PDFInfo
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- CN103696374A CN103696374A CN201310726919.4A CN201310726919A CN103696374A CN 103696374 A CN103696374 A CN 103696374A CN 201310726919 A CN201310726919 A CN 201310726919A CN 103696374 A CN103696374 A CN 103696374A
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Abstract
The invention relates to a straddle method of a cantilever of a long-span simply supported steel truss beam of the horizontal curve section. The straddle method comprises calculating the lengths of main truss rods arranged on the inner side and the outer side of a cantilever span curve and main truss rods arranged on the inner side and the outer side of an anchor span curve according to the radius of a horizontal curve, the position on the horizontal curve of a bridge span structure and the main truss spacing; hoisting the main truss rods arranged on the inner side and the outer side of the cantilever span curve to the position of a permanent support arranged at the top of an Nth pier, enabling the permanent support arranged at the pier top and the main truss rods arranged on the inner side and the outer side of the anchor span curve to be connected together through a temporary connection structure and performing cantilever construction of steel beam rods along the design axis; removing the temporary connection structure after the bridge span is straddled in place. According to the straddle method of the cantilever of the long-span simply supported steel truss beam of the horizontal curve section, the horizontal pushing in-place operation of the steel beam in the process of construction is avoided successfully, the construction process is simplified, the straddle construction of the cantilever of the long-span simply supported steel truss beam of the horizontal curve section can be greatly simplified, the stress is reliable, the construction is convenient, the operation is simple, temporary construction facilities and field workloads of the pier top are reduced, the construction progress greatly speeds up, the construction cost is saved, and the economic benefit is remarkable.
Description
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
At present the length of highway, railroad bridge building project general all more than several kilometers, even tens kilometers, due to the demand of beam section wiring, so long circuit can not be all on straightway, therefore a large amount of non-navigation bridges may be disposed on curved section.For reducing design, manufacture and the difficulty of construction, general 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 greatly, across freely-supported steel truss girder bridge, free cantilever erection is a kind of economically viable method, in construction, is widely adopted.But when steel truss girder bridge is disposed on horizontal curve, between adjacent axis, can have a drift angle, traditional free cantilever erection will make cantilever span in work progress, depart from its center line, can be with the problem of serving like this:
(1) need set up interim fulcrum at Dun Ding: due to adjacent, have angle between across axis, during cantilever erection, front end fulcrum and anchoring fulcrum all can off-design positions, must interim fulcrum be set in addition at each Dun Ding so.
(2) need carry out lateral pushing operation: after cantilever erection arrives interim fulcrum, need carry out the operation that lateral pushing is adjusted axis, make bridge span structure in place, so just must be equipped with corresponding lateral pushing equipment and device, bridge pier size will increase thereupon accordingly.
(3) affect loop wheel machine safety: during lateral pushing operation, loop wheel machine is still on bridge span structure, and its construction safety performance is affected.
For the longspan steel truss girder crane span structure on curved section, establish, also have at present some good tries, for example: before free cantilever erection, anchoring is adjusted to a suitable angle across beam-ends, reduce the lateral pushing shift value of structure after assembled completing; At N+1 Dun Ding, lay slide plate, reduce lateral pushing power etc.These methods can reduce the difficulty of construction to a certain extent, but cannot be from solving in fact the problem of bringing due to axis runout.
Summary of the invention
The object of the invention is for above-mentioned present situation, aim to provide a kind of cantilever bridge that can fundamentally solve across the problem of axis runout, construction speed is high, and easy construction, cost are low, can stablize, at curved section, set up greatly the method across freely-supported steel trussed beam cantilever efficiently.
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) according to radius of horizontal curve, bridge span structure, the position on horizontal curve and main truss spacing utilize geometrical relationship to calculate cantilever span curve medial and lateral main truss rod member and anchoring across the length of curve medial and lateral main truss rod member, 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 the interim structure that connects that the permanent bearing of Dun Ding and anchoring are linked together across curve medial and lateral main truss rod member;
Interim connection is configured to 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, loop wheel machine is turned over after 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 the interim structure that connects;
Rod member is assembled to N+1 Dun Ding, acts directly on permanent fulcrum; Remove N Dun Ding and connect temporarily, complete this construction of free cantilever erection across structure.
The present invention has successfully avoided the 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 adjustment, has been simplified working procedure.
The invention enables greatly simplifying across the construction of freely-supported steel truss girder bridge cantilever erection greatly on curved section, stressed reliable, easy construction, simple to operate, accelerating construction progress, saves construction cost, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is free cantilever erection floor map,
Fig. 2 is that N pier pushes up local enlarged diagram,
Fig. 3 is the local enlarged diagram of novel interim splicing structure.
The specific embodiment
With reference to the accompanying drawings 1,2,3, the concrete steps in conjunction with horizontal curve section freely-supported steel trussed beam cantilever erection method, elaborate the present invention.
1) according to radius of horizontal curve, bridge span structure the position on horizontal curve and main truss distance computation cantilever span curve medial and lateral main truss rod member and anchoring across the length of curve medial and lateral main truss rod member.
Long+1/2 * sin α * main truss of main truss rod member length outside curve=internode spacing
Long-1/2 * sin α * main truss of the inner side of curve main truss rod member length=internode spacing
In the plane, the length of main truss rod member is greater than the length of the inner side of curve main truss rod member outside cantilever span curve, 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 the permanent bearing of N Dun Ding 6 positions, adopt the interim structure 5 that connects that the permanent bearing of Dun Ding and anchoring are linked together across the inner side of curve main truss rod member 4 across main truss rod member 2, anchoring outside curve;
The interim structure 5 that connects 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, loop wheel machine is turned over after corner α, run on cantilever span rod member, along bridge axis 7 free cantilever erection steel truss girders; 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 that is designed to straightway produces.The present invention has successfully overcome 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, must eliminate corner α by lateral pushing.
4) cantilever end fulcrum is dropped on the permanent bearing 8 of N+1 Dun Ding, remove the interim structure that connects;
N+1 Dun Ding is equally without arranging interim fulcrum, and cantilever span rod member is assembled to N+1 Dun Ding, can act directly on permanent fulcrum.Remove N Dun Ding and connect temporarily, complete this construction of free cantilever erection across structure.
The present invention, in whole free cantilever erection process, does not arrange any interim fulcrum, and cantilever bridge all adopts permanent fulcrum across N, N+1 Dun Ding.Complete the spanning of free cantilever erection without carrying out any pushing tow and bearing adjusting operation, can as anchoring, across the cantilever erection that participates in next spanning, construct immediately.
Claims (5)
1. horizontal curve section, greatly across freely-supported steel trussed beam cantilever erection method, is characterized in that concrete steps are as follows:
1) according to radius of horizontal curve, bridge span structure, the position on horizontal curve and main truss spacing utilize geometrical relationship to calculate cantilever span curve medial and lateral main truss rod member and anchoring across the length of curve medial and lateral main truss rod member, 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 the interim structure that connects that the permanent bearing of Dun Ding and anchoring are linked together across curve medial and lateral main truss rod member;
Interim connection is configured to 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, loop wheel machine is turned over after 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 the interim structure that connects;
Rod member is assembled to N+1 Dun Ding, acts directly on permanent fulcrum; Remove N Dun Ding and connect temporarily, complete this construction of free cantilever erection across structure.
2. horizontal curve section freely-supported steel trussed beam cantilever erection method according to claim 1, is characterized in that the length position on horizontal curve and design of main truss spacing according to bridge span structure of spanning end main truss rod member.
3. horizontal curve section freely-supported steel trussed beam cantilever erection method according to claim 1, it is characterized in that anchoring across and the axis of cantilever span between there is angle, adopt with the interim connection construction complete anchoring of knuckle across with cantilever span between the interim of main truss rod member be connected.
4. horizontal curve section freely-supported steel trussed beam cantilever erection method according to claim 1, is characterized in that, in whole free cantilever erection process, cantilever bridge all adopts permanent fulcrum across N, N+1 Dun Ding.
5. horizontal curve section freely-supported steel trussed beam cantilever erection method according to claim 1, is characterized in that in cantilever erection process, cantilever bridge axis across all the time along design axis direction.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107974917A (en) * | 2017-11-15 | 2018-05-01 | 中铁大桥勘测设计院集团有限公司 | One kind bending node, curve continuous steel girder bridge and its design method |
| CN108265632A (en) * | 2018-03-27 | 2018-07-10 | 洛阳理工学院 | Curved bridge fitting layout stracture and its distribution method based on orthogonal precast beam |
| CN108755384A (en) * | 2018-07-27 | 2018-11-06 | 山东大学 | A kind of belt track free cantilever erection steel girder bridge and its construction 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 |
| CN111764300A (en) * | 2020-07-21 | 2020-10-13 | 安徽省交通建设股份有限公司 | Curved steel beam pushing system and construction method |
| CN112144401A (en) * | 2020-06-28 | 2020-12-29 | 中交第二航务工程局有限公司 | Bridge girder erection machine over-span method based on curve track and large longitudinal slope environment |
| CN112411343A (en) * | 2020-11-30 | 2021-02-26 | 中交路桥建设有限公司 | Mountain area ultrahigh traffic-guaranteeing curve cast-in-place box girder combined support and erection method |
| CN114626137A (en) * | 2022-04-15 | 2022-06-14 | 中铁大桥局集团有限公司 | Method for acquiring curve section steel truss girder of large-span steel-concrete combined continuous beam bridge |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN108265632A (en) * | 2018-03-27 | 2018-07-10 | 洛阳理工学院 | Curved bridge fitting layout stracture and its distribution method based on orthogonal precast beam |
| CN108265632B (en) * | 2018-03-27 | 2023-12-26 | 洛阳理工学院 | Curve bridge fitting layout structure based on orthogonal precast beam plates and layout method thereof |
| CN108755384B (en) * | 2018-07-27 | 2023-06-02 | 山东大学 | Cantilever assembled steel truss bridge with track and construction method thereof |
| CN108755384A (en) * | 2018-07-27 | 2018-11-06 | 山东大学 | A kind of belt track free cantilever erection steel girder bridge and its construction 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 |
| CN112144401A (en) * | 2020-06-28 | 2020-12-29 | 中交第二航务工程局有限公司 | Bridge girder erection machine over-span method based on curve track and large longitudinal slope environment |
| CN111764300A (en) * | 2020-07-21 | 2020-10-13 | 安徽省交通建设股份有限公司 | Curved steel beam pushing system and construction method |
| CN111764300B (en) * | 2020-07-21 | 2022-03-25 | 安徽省交通建设股份有限公司 | Curved steel beam pushing system and construction method |
| CN112411343A (en) * | 2020-11-30 | 2021-02-26 | 中交路桥建设有限公司 | Mountain area ultrahigh traffic-guaranteeing curve cast-in-place box girder combined support and erection method |
| CN114626137A (en) * | 2022-04-15 | 2022-06-14 | 中铁大桥局集团有限公司 | Method for acquiring curve section steel truss girder of large-span steel-concrete combined continuous beam bridge |
| CN114626137B (en) * | 2022-04-15 | 2024-04-19 | 中铁大桥局集团有限公司 | Method for obtaining large-span steel-concrete combined continuous beam bridge curve section steel truss girder |
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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. |