CN107916625B - Widening structure and method for wide cantilever box girder - Google Patents
Widening structure and method for wide cantilever box girder Download PDFInfo
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- CN107916625B CN107916625B CN201711417066.0A CN201711417066A CN107916625B CN 107916625 B CN107916625 B CN 107916625B CN 201711417066 A CN201711417066 A CN 201711417066A CN 107916625 B CN107916625 B CN 107916625B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention particularly relates to a widening structure of a wide cantilever box girder and a method thereof, which solve the problems of complex process, high manufacturing cost, large damage to an original structure and inconvenient later maintenance caused by poor connection rigidity in the existing wide cantilever box Liang Jiakuan. The upper end face of the beam bottom steel plate is provided with a longitudinal stiffening steel plate and connecting steel bars, the left side and the right side of the longitudinal stiffening steel plate are provided with vertical anchor bolts, the inner sides of adjacent webs of the original box girder and the widened box girder are provided with transverse anchor bolts, the adjacent sides of the original box girder and the widened box girder are provided with bottom plate embedded steel bars and bottom plate reserved steel bars, and the beam bottom steel plate is provided with a concrete bottom plate cast-in-situ layer; the original box girder top plate is provided with a top plate steel bar, a top plate bottom steel bar, a top plate reserved steel bar and a top plate bottom reserved steel bar, and the original box girder and the widened box girder cast-in-situ layer are provided with cast-in-situ layer steel bars and cast-in-situ layer reserved steel bars. The invention improves the safety performance of the structure, ensures the durability of the original structure, and has the advantages of low construction cost and short construction period.
Description
Technical Field
The invention relates to a widening technology for highway bridge and culvert engineering, in particular to a widening structure of a wide cantilever box girder and a method thereof.
Background
At present, the new road in China has an unprecedented scale, and the reconstruction and expansion project in the future operation becomes a great key point of road construction. In the road reconstruction and expansion engineering, one of the key technical problems is the widening and transformation of the existing bridge. Different from the common bridge design, the bridge widening reconstruction design must consider the mutual influence of new and old beam slab structures in the construction stage and the use stage, and reasonable construction measures and proper construction methods are required to be adopted, so that the damage to the original structure is reduced as much as possible, and the safety, durability and applicability of the bridge after widening are ensured.
The problem of widening and reforming the wide cantilever box girder structure is more remarkable, the girder flange plates are generally only transversely connected in the conventional design method, the transverse connection rigidity of the new structure and the old structure is poor, the deflection difference between the new structure and the old structure cannot be overcome, paving cracks at joints are unavoidable in long-term operation, and potential safety hazards are brought to later maintenance. In other transverse connection designs adopting the steel bar planting technology, the construction technology is complex, the steps are numerous, the engineering cost is high, and the damage to the original structure is large.
Disclosure of Invention
The invention provides a widening structure and a widening method of a wide cantilever box girder, which aims to solve the problems of complex process, high manufacturing cost, large damage to an original structure and inconvenient later maintenance caused by poor connection rigidity in the widening process of the existing wide cantilever box girder.
The invention is realized by adopting the following technical scheme: the widening structure of the wide cantilever box girder comprises a girder bottom steel plate which is arranged between an original box girder and a widening box girder and clings to the lower end surfaces of the two bottom plates, wherein the upper end surface of the girder bottom steel plate is provided with a plurality of left and right longitudinal stiffening steel plates, a plurality of connecting steel bars which are distributed front and back are penetrated in the longitudinal stiffening steel plates, the left side and the right side of the longitudinal stiffening steel plates are provided with vertical anchor bolts which are fixed with the bottom plates of the original box girder and the widening box girder, the inner sides of adjacent webs of the original box girder and the widening box girder are respectively provided with a transverse anchor bolt which is fixed with the longitudinal stiffening steel plates at the left end and the right end, the right side of the bottom plate of the original box girder is provided with a bottom plate implantation steel bar which is fixed with the connecting steel bars, and the left side of the bottom plate of the widening box girder is provided with a concrete bottom plate cast-in-situ layer; the right side of the original box girder top plate is provided with a top plate reinforcing bar and a top plate bottom reinforcing bar, the left side of the widened box girder top plate is provided with a top plate reserved reinforcing bar connected with the top plate reinforcing bar and a top plate bottom reserved reinforcing bar connected with the top plate bottom reinforcing bar, the left side of the original box girder cast-in-situ layer is provided with a cast-in-situ layer reinforcing bar, and the left side of the widened box girder cast-in-situ layer is provided with a cast-in-situ layer reserved reinforcing bar connected with the cast-in-situ layer reinforcing bar.
The structural design utilizes the characteristics of strong concrete compression resistance, strong steel plate bending resistance and good deformation adaptability, adopts the steel plate at the beam bottom to form a new reinforced concrete combined box beam between the new box beam and the old box beam, improves the overall rigidity and the torsion resistance between the new box beam and the old box beam, greatly reduces diseases at new and old bridging joints in the operation stage, increases the bending resistance of a widened structure, and simultaneously furthest reduces the damage to the original structure because a large-area reinforcement planting process is not adopted, and solves the problems of complex process, high manufacturing cost, large damage to the original structure and inconvenient later maintenance caused by poor connection rigidity when the existing wide cantilever box Liang Jiakuan is overcome.
A widening method of a wide cantilever box girder comprises the following steps: a. embedding a transverse anchor bolt, a vertical anchor bolt and a bottom plate embedded steel bar on a bottom plate and a widened side web plate of an original box girder, hoisting a girder bottom steel plate and a connecting steel bar penetrating the girder bottom steel plate in place, performing anchoring connection with the original box girder, performing anchoring connection on the girder bottom steel plate and the connecting steel bar penetrating the girder bottom steel plate and the widened box girder, and pouring concrete to form a whole; b. chiseling out the flange part of the original box girder until the thickness is the same as that of the flange end part of the cast-in-situ box girder top plate, welding and connecting the original box girder with top plate reinforcing steel bars and top plate reserved reinforcing steel bars in the widened box girder top plate as well as top plate bottom reinforcing steel bars and top plate bottom reserved reinforcing steel bars, and pouring top plate concrete; c. and chiseling a cast-in-situ layer at the cantilever of the original box girder, and pouring the cast-in-situ layer of the bridge deck of the original box girder after welding by utilizing the cast-in-situ layer steel bars and the cast-in-situ layer reserved steel bars so as to finish the widening operation of the box girder of the wide cantilever.
The beam bottom steel plate is used as a template for concrete pouring, so that the construction is convenient, and the construction period is shortened.
The widening technology of the wide cantilever box girder greatly improves the overall rigidity and the torsion resistance between the new box girder and the old box girder, greatly reduces diseases in the operation stage, increases the travelling comfort, increases the bending bearing capacity of the structure, improves the safety performance of the structure, reduces the damage to the original structure, ensures the durability of the original structure, and has the advantages of low construction cost and short construction period.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-original box girder, 2-widened box girder, 3-girder bottom steel plate, 4-longitudinal stiffening steel plate, 5-connecting steel bar, 6-vertical anchor bolt, 7-transverse anchor bolt, 8-bottom plate embedded steel bar, 9-concrete bottom plate cast-in-situ layer, 10-top plate steel bar, 11-top plate bottom steel bar, 12-cast-in-situ layer steel bar, 13-bottom plate reserved steel bar, 14-top plate reserved steel bar, 15-top plate bottom reserved steel bar and 16-cast-in-situ layer reserved steel bar.
Detailed Description
The widening structure of the wide cantilever box girder comprises a girder bottom steel plate 3 which is arranged between an original box girder 1 and a widening box girder 2 and clings to the lower end surfaces of the two bottom plates, wherein the upper end surface of the girder bottom steel plate 3 is provided with a plurality of left and right distributed longitudinal stiffening steel plates 4, a plurality of connecting steel bars 5 which are distributed front and back are penetrated in the longitudinal stiffening steel plates 4, the left side and the right side of the longitudinal stiffening steel plates 4 are provided with vertical anchor bolts 6 which are fixed with the bottom plates of the original box girder 1 and the widening box girder 2, the inner sides of adjacent webs of the original box girder 1 and the widening box girder 2 are respectively provided with transverse anchor bolts 7 which are fixed with the left and right longitudinal stiffening steel plates 4, the right side of the bottom plate of the original box girder 1 is provided with bottom plate implantation steel bars 8 which are fixed with the connecting steel bars 5, the left side of the bottom plate of the widening box girder 2 is provided with bottom plate reservation steel bars 13 which are fixed with the connecting steel bars 5, and the girder bottom steel plate 3 is provided with a concrete bottom plate cast-in-place layer 9; the right side of the top plate of the original box girder 1 is provided with a top plate reinforcing steel bar 10 and a top plate bottom reinforcing steel bar 11, the left side of the top plate of the widened box girder 2 is provided with a top plate reserved reinforcing steel bar 14 connected with the top plate reinforcing steel bar 10 and a top plate bottom reserved reinforcing steel bar 15 connected with the top plate bottom reinforcing steel bar 11, the left side of the cast-in-situ layer of the original box girder 1 is provided with a cast-in-situ layer reinforcing steel bar 12, and the left side of the cast-in-situ layer of the widened box girder 2 is provided with a cast-in-situ layer reserved reinforcing steel bar 16 connected with the cast-in-situ layer reinforcing steel bar 12.
A widening method of a wide cantilever box girder comprises the following steps: a. the method comprises the steps of implanting a transverse anchor bolt 7, a vertical anchor bolt 6 and a bottom plate implanted steel bar 8 on a bottom plate and a widened side web plate of an original box girder 1, hoisting a girder bottom steel plate 3 and a connecting steel bar 5 penetrating the girder bottom steel plate in place, performing anchoring connection with the original box girder 1, performing anchoring connection on the girder bottom steel plate 3 and the connecting steel bar 5 penetrating the girder bottom steel plate and the widened box girder 2, and pouring concrete to form a whole; b. chiseling out the flange part of the top plate of the original box girder 1 until the thickness is the same as that of the flange end part of the top plate of the cast-in-situ box girder 2, welding and connecting the original box girder 1 with the top plate reinforcing steel bars 10, the top plate reserved reinforcing steel bars 14, the top plate bottom reinforcing steel bars and the top plate bottom reserved reinforcing steel bars 15 in the top plate of the widened box girder 2, and then pouring top plate concrete; c. and chiseling a cast-in-situ layer at the cantilever of the original box girder 1, and pouring the bridge deck cast-in-situ layer of the original box girder 1 after welding by utilizing cast-in-situ layer reinforcing steel bars 12 and cast-in-situ layer reserved reinforcing steel bars 16, so as to complete the widening operation of the wide cantilever box girder.
Claims (1)
1. A widening method of a wide cantilever box girder is characterized by comprising the following steps: the method is realized based on a widening structure of a wide cantilever box girder, the structure comprises a girder bottom steel plate (3) which is arranged between an original box girder (1) and a widening box girder (2) and is tightly attached to the lower end surfaces of bottom plates of the original box girder and the widening box girder, a plurality of left and right distributed longitudinal stiffening steel plates (4) are arranged on the upper end surfaces of the girder bottom steel plate (3), a plurality of connecting steel bars (5) which are distributed front and back are penetrated in the longitudinal stiffening steel plates (4), vertical anchor bolts (6) which are fixed with the bottom plates of the original box girder (1) and the widening box girder (2) are arranged on the left and right sides of the longitudinal stiffening steel plates (4), transverse anchor bolts (7) which are fixed with the longitudinal stiffening steel plates (4) at the left and the right ends are arranged on the inner sides of adjacent webs of the original box girder (1) and the widening box girder (2), bottom plate implantation steel bars (8) which are fixed with the connecting steel bars (5) are arranged on the left side of the bottom plate of the original box girder (1), bottom plate reservation steel bars (13) which are fixed with the connecting steel bars (5), and a concrete bottom plate layer (9) is arranged on the girder bottom steel plate (3) in a cast-in place; the right side of the top plate of the original box girder (1) is provided with a top plate reinforcing bar (10) and a top plate bottom reinforcing bar (11), the left side of the top plate of the widened box girder (2) is provided with a top plate reserved reinforcing bar (14) connected with the top plate reinforcing bar (10) and a top plate bottom reserved reinforcing bar (15) connected with the top plate bottom reinforcing bar (11), the left side of the cast-in-situ layer of the original box girder (1) is provided with a cast-in-situ layer reinforcing bar (12), and the left side of the cast-in-situ layer of the widened box girder (2) is provided with a cast-in-situ layer reserved reinforcing bar (16) connected with the cast-in-situ layer reinforcing bar (12); the method comprises the following steps: a. a transverse anchor bolt (7), a vertical anchor bolt (6) and a bottom plate implantation reinforcing steel bar (8) are implanted on a bottom plate and a widened side web plate of an original box girder (1), then a girder bottom steel plate (3) and a connecting reinforcing steel bar (5) penetrating through the girder bottom steel plate are hoisted in place and then are connected with the original box girder (1) in an anchoring manner, and then the girder bottom steel plate (3) and the connecting reinforcing steel bar (5) penetrating through the girder bottom steel plate are connected with the widened box girder (2) in an anchoring manner and then concrete is poured into a whole; b. chiseling out the flange part of the top plate of the original box girder (1) until the thickness is the same as that of the flange end part of the top plate of the widened box girder (2), welding and connecting the original box girder (1) with the top plate reinforcing steel bars (10) and the top plate reserved reinforcing steel bars (14) in the top plate of the widened box girder (2) and the top plate bottom reinforcing steel bars and the top plate bottom reserved reinforcing steel bars (15), and pouring top plate concrete; c. and chiseling a cast-in-situ layer at the cantilever of the original box girder (1), and pouring a bridge deck cast-in-situ layer of the original box girder (1) after welding by utilizing cast-in-situ layer steel bars (12) and cast-in-situ layer reserved steel bars (16), so as to complete the widening operation of the wide cantilever box girder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711417066.0A CN107916625B (en) | 2017-12-25 | 2017-12-25 | Widening structure and method for wide cantilever box girder |
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| CN201711417066.0A CN107916625B (en) | 2017-12-25 | 2017-12-25 | Widening structure and method for wide cantilever box girder |
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| CN107916625A CN107916625A (en) | 2018-04-17 |
| CN107916625B true CN107916625B (en) | 2023-05-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109706844A (en) * | 2019-02-14 | 2019-05-03 | 中设工程咨询(重庆)股份有限公司 | Interchange ramp bridge widens method |
| CN113047186B (en) * | 2021-03-24 | 2022-08-30 | 华东交通大学 | Bridge reinforcing apparatus |
| CN113585045A (en) * | 2021-08-24 | 2021-11-02 | 南京工业大学 | Combined formwork-free wet joint connecting structure for new and old spliced wide bridge |
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| CN206090273U (en) * | 2016-09-09 | 2017-04-12 | 湖南省交通规划勘察设计院 | Prefabricated UHPC of assembling of festival section wave form steel web combination box beam and cable -stay bridge |
| CN107100092A (en) * | 2017-05-21 | 2017-08-29 | 山西省交通科学研究院 | The quick bridge widening structure and installation method of a kind of uninterrupted traffic |
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| AT380502B (en) * | 1983-02-28 | 1986-06-10 | Vorspann Technik Gmbh | METHOD AND DEVICE FOR WIDING RUNWAY PANELS, BRIDGE ROADWAYS OR THE LIKE. |
| CN101424075B (en) * | 2008-11-24 | 2010-10-20 | 重庆交通大学 | Concrete box girder bridge widening and reinforced structure and construction method thereof |
| CN203741730U (en) * | 2013-12-20 | 2014-07-30 | 江苏中瑞路桥建设有限公司 | T-shaped bridge reinforcing structure |
| CN104631348A (en) * | 2015-02-03 | 2015-05-20 | 东南大学 | Transversely-widening splicing structure of three-dimensional prestress concrete continuous box girder bridge |
| CN204608619U (en) * | 2015-03-27 | 2015-09-02 | 长沙学院 | A kind of new construction widening reinforcing on exist curves |
| CN204849562U (en) * | 2015-07-31 | 2015-12-09 | 中铁第四勘察设计院集团有限公司 | Little box girder bridge roof beam |
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| CN105297641B (en) * | 2015-10-29 | 2016-08-24 | 北京中交铁建科技发展有限公司 | Highway T beam diaphragm plate prestressed reinforcement structure and carry out the engineering method reinforced with it |
| CN206298836U (en) * | 2016-11-16 | 2017-07-04 | 福州大学 | A kind of bridge of use Z bar plate connector spells construction wide |
| CN207672411U (en) * | 2017-12-25 | 2018-07-31 | 山西省交通规划勘察设计院 | A kind of widening structure of width cantilever boxgirder |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206090273U (en) * | 2016-09-09 | 2017-04-12 | 湖南省交通规划勘察设计院 | Prefabricated UHPC of assembling of festival section wave form steel web combination box beam and cable -stay bridge |
| CN107100092A (en) * | 2017-05-21 | 2017-08-29 | 山西省交通科学研究院 | The quick bridge widening structure and installation method of a kind of uninterrupted traffic |
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Address after: 030006 Shanxi Transportation Technology Park, No. 27 Wuluo Street, Xiaodian District, Taiyuan City, Shanxi Province Applicant after: SHANXI PROVINCIAL TRAFFIC PLANNING SURVEY AND DESIGN INSTITUTE Co.,Ltd. Address before: 030012 No. 69, Binzhou South Road, Taiyuan City, Shanxi Province Applicant before: SHANXI TRAFFIC PLANNING PROSPECTING & DESIGN INSTITUTE |
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