CN104294751B - Reinforcing structure for cross section of large-span prestressed concrete box girder - Google Patents
Reinforcing structure for cross section of large-span prestressed concrete box girder Download PDFInfo
- Publication number
- CN104294751B CN104294751B CN201410494957.6A CN201410494957A CN104294751B CN 104294751 B CN104294751 B CN 104294751B CN 201410494957 A CN201410494957 A CN 201410494957A CN 104294751 B CN104294751 B CN 104294751B
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- Prior art keywords
- box beam
- wing
- stretch
- presstressed reinforcing
- flange
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention relates to a reinforcing structure for a cross section of a large-span prestressed concrete box girder. The reinforcing structure is at least provided with one prestressed tendon, one end of the prestressed tendon is provided with a first tensioning port at the flange part of one side flange of a box type beam bridge top plate, namely a first flange, and the other end of the prestressed tendon sequentially winds from the first tensioning port along the box type beam bridge top plate, a web plate opposite to the flange of the top plate provided with the first tensioning port, a bottom plate and a web plate adjacent to the flange of the top plate provided with the first tensioning port, and then winds along the box type beam bridge top plate to the flange part of the other side top plate flange of the box type beam bridge, namely a second flange; and the prestressed tendon is provided with a second tensioning port at the flange of the second wing edge. The reinforcing structure is low in construction difficulty and high in construction efficiency, so that the applying efficiency of vertical prestress can be obviously improved, the transverse and vertical strength of the box beam can be guaranteed, and the rigidity of the cross section of the box beam is increased.
Description
Technical field
The invention belongs to large span prestressed concrete Box-girder Bridges technical field, be specifically related to the enhancing structure of a kind of large span prestressed concrete box beam transverse section.
Background technology
At present, large-span prestressed concrete beam bridge is used widely, both at home and abroad built substantial amounts of large-span prestressed concrete beam bridge.In built bridge, a lot of large-span prestressed concrete beam bridges occur in that longitudinal crack on box beam top board, web then occurs diagonal crack, the durability causing bridge reduces and bridge floor damage, thus have impact on the normal use of bridge, cause huge economic loss and bad social influence.It is not enough that top board longitudinal crack Producing reason is mainly top board direction across bridge tensile strength, and under the combined effect of bridge load and longitudinal prestressing, bigger tension occurs in box beam top board；The generation of weakened web is mainly caused by web shearing strength deficiency.
For improving prestressed concrete box beams laterally and vertical intensity, current common practices is vertical Shi Hanzhang in the transverse direction of box beam top board and web respectively.The construction technology of this way is relatively complicated, it is difficult to ensureing construction quality, and owing to vertical prestressing bar is shorter, limit by construction technology and can cause bigger loss of prestress, prestressed efficiency comparison is low, it is difficult to ensure that the shearing strength of web.
Summary of the invention
The invention aims to overcome the deficiencies in the prior art, it is provided that the enhancing structure of a kind of large span prestressed concrete box beam transverse section.This enhancing structure construction difficulty is low, and efficiency of construction is higher, such that it is able to significantly improve the applying efficiency of vertical prestressing, and ensure that the intensity that box beam is horizontal and vertical, also add the transverse section rigidity of box beam.
For achieving the above object, present invention employs techniques below scheme:
A kind of enhancing structure of large span prestressed concrete box beam transverse section, at least provided with a presstressed reinforcing steel in this enhancing structure, one end of described presstressed reinforcing steel arranges the first stretch-draw port at a flank limit of the Box-girder Bridges top board i.e. edge of a wing place on the first wing limit, the presstressed reinforcing steel other end from described first stretch-draw port along the top board of Box-girder Bridges, the web relative with the top board edge of a wing being provided with the first stretch-draw port, base plate, the web adjacent with the top board edge of a wing being provided with the first stretch-draw port curls up successively, and then along the top board of Box-girder Bridges around the opposite side top board wing limit i.e. edge of a wing place on the second wing limit extending Box-girder Bridges；Described presstressed reinforcing steel is provided with the second stretch-draw port at the edge of a wing place on described second wing limit.
Preferably, this enhancing structure is vertically arranged with many presstressed reinforcing steels along Box-girder Bridges, these many presstressed reinforcing steels to curl up direction identical, and the first stretch-draw port of these many presstressed reinforcing steels is arranged on the edge of a wing place on same flank limit of Box-girder Bridges top board.
Preferably, the first stretch-draw port of described presstressed reinforcing steel and the second stretch-draw port office are on two different transverse section of Box-girder Bridges.
The beneficial effects of the present invention is:
1) presstressed reinforcing steel, in this enhancing structure curls up in petrin shape, and two stretch-draw ports of described presstressed reinforcing steel can be arranged on the same transverse section of box beam, it is also possible to the length direction along box beam is arranged on two different transverse section.When the presstressed reinforcing steel of petrin shape is arranged on the same transverse section of box beam, this enhancing structure just meets only by a presstressed reinforcing steel simultaneously and applies laterally and the needs of vertical prestressing, thus greatly simplifiing construction technology.Additionally, this enhancing structure is not only easy to constructing operation, and it is prone to ensure construction quality.
2), the single presstressed reinforcing steel in this enhancing structure adopts the frame mode of two ends stretch-draw, it is possible to be effectively reduced loss of prestress.
3) every presstressed reinforcing steel, in this enhancing structure extends layout twist all along the length direction of box beam, so that the stress of presstressed reinforcing steel is even more ideal, considerably increases stability and the reliability of presstressed reinforcing steel work.
4), this enhancing structure can significantly increase the applying efficiency of vertical prestressing, and ensure that box beam is laterally and vertical intensity, also effectively increases the transverse section rigidity of box beam.
5), the enhancing arrangement works in the present invention is reliable, economy and facility. adopt the enhancing structure in the present invention can reduce the workload of anchoring 50%, save the material of more than 50%, therefore this enhancing structure greatly reduces difficulty of construction, improve work efficiency, saved resource and reduced cost.
Accompanying drawing explanation
Fig. 1 is the mounting structure schematic diagram of this enhancing structure.
Fig. 2 is the schematic top plan view of Fig. 1.
In figure, the implication of label symbol is as follows:
10 edge of a wing, box beam 11A first wing limit 11B second wing limits 111
12A/12B web 121 web edge 13 base plate 14 cavity
One end of 20 presstressed reinforcing steel 21 first stretch-draw port 22 presstressed reinforcing steels
The other end 24 second stretch-draw port of 23 presstressed reinforcing steels
Detailed description of the invention
It is described further below in conjunction with the accompanying drawing structure to the present invention and work process.
As shown in Figure 1, 2, this enhancing structure is provided with many presstressed reinforcing steels 20 along the length direction of box beam 10, these many presstressed reinforcing steels 20 to curl up direction identical.
For a presstressed reinforcing steel 20, as shown in Figure 1, one end 22 of this presstressed reinforcing steel 20 on a flank limit of box beam 10 top board that is the edge of a wing 111 place of the first wing limit 11A the first stretch-draw port 21 is set, presstressed reinforcing steel 20 other end 23 from described first stretch-draw port 21 place along the top board of box beam 10, the web 12B relative with the top board edge of a wing being provided with the first stretch-draw port 22, base plate 13, the web 12A adjacent with the top board edge of a wing being provided with the first stretch-draw port 22 curls up successively, and then along the top board of box beam 10 around the opposite side top board wing limit i.e. edge of a wing 111 place of the second wing limit 11B extending box beam 10；Described presstressed reinforcing steel 20 is provided with the second stretch-draw port 24 at the edge of a wing 111 place of described second wing limit 11B.
As in figure 2 it is shown, the first stretch-draw port 21 of many presstressed reinforcing steels 20 is arranged on the edge of a wing place on the same flank limit of box beam 10 top board.
As in figure 2 it is shown, the first stretch-draw port 21 of each presstressed reinforcing steel 20 and the second stretch-draw port 24 are divided equally on two the different transverse section being in box beam 10.
Claims (3)
1. the enhancing structure of a large span prestressed concrete box beam transverse section, it is characterized in that: at least provided with a presstressed reinforcing steel (20) in this enhancing structure, one end of described presstressed reinforcing steel (20) on a flank limit of box beam (10) top board that is the edge of a wing place on the first wing limit (11A) the first stretch-draw port (21) is set, presstressed reinforcing steel (20) other end from described first stretch-draw port (21) place along the top board of box beam (10), the web (12B) relative with the top board edge of a wing being provided with the first stretch-draw port (22), base plate (13), the web (12A) adjacent with the top board edge of a wing being provided with the first stretch-draw port (22) curls up successively, and then along the top board of box beam (10) around the opposite side top board wing limit i.e. edge of a wing place on the second wing limit (11B) extending box beam (10)；Described presstressed reinforcing steel (20) is provided with the second stretch-draw port (24) at the edge of a wing place on described second wing limit (11B).
2. the enhancing structure of large span prestressed concrete box beam transverse section according to claim 1, it is characterized in that: this enhancing structure is vertically arranged with many presstressed reinforcing steels (20) along box beam (10), these many presstressed reinforcing steels (20) to curl up direction identical, and the first stretch-draw port (21) of these many presstressed reinforcing steels (20) is arranged on the edge of a wing place on same flank limit of box beam (10) top board.
3. the enhancing structure of large span prestressed concrete box beam transverse section according to claim 1 and 2, it is characterised in that: the first stretch-draw port (21) of described presstressed reinforcing steel (20) and the second stretch-draw port (24) office are on two different transverse section of box beam (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494957.6A CN104294751B (en) | 2014-09-24 | 2014-09-24 | Reinforcing structure for cross section of large-span prestressed concrete box girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410494957.6A CN104294751B (en) | 2014-09-24 | 2014-09-24 | Reinforcing structure for cross section of large-span prestressed concrete box girder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104294751A CN104294751A (en) | 2015-01-21 |
| CN104294751B true CN104294751B (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410494957.6A Active CN104294751B (en) | 2014-09-24 | 2014-09-24 | Reinforcing structure for cross section of large-span prestressed concrete box girder |
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| CN (1) | CN104294751B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648890A (en) * | 2016-03-18 | 2016-06-08 | 大连理工大学 | U-shaped prestressed structure for webs and bottom board of concrete box beam |
| CN110172899A (en) * | 2019-07-01 | 2019-08-27 | 上海宝冶集团有限公司 | A kind of box beam |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100373883B1 (en) * | 1999-06-10 | 2003-02-26 | 대림산업 주식회사 | Construction method for shoe block of prestressed concrete bridge |
| KR100635137B1 (en) * | 2004-11-08 | 2006-10-17 | 주식회사 효성엘비데크 | Bridge slab construction method and lattice bar deck-shaped precast concrete plate applied therein |
| CN102220739B (en) * | 2011-04-01 | 2012-09-26 | 河南省交通规划勘察设计院有限责任公司 | Corrugated steel web prestressed concrete continuous box girder and construction method thereof |
| CN102943434B (en) * | 2012-10-24 | 2014-11-19 | 南京林业大学 | Semi-assembly bamboo-concrete composite bridge |
| CN204112205U (en) * | 2014-09-24 | 2015-01-21 | 安徽建工集团有限公司 | The enhancing structure in large span prestressed concrete box beam cross section |
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- 2014-09-24 CN CN201410494957.6A patent/CN104294751B/en active Active
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| CN104294751A (en) | 2015-01-21 |
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Effective date of registration: 20170424 Address after: 233000 Anhui City, East China Sea Road, Cheung Shan Road South Patentee after: ANHUI WATER RESOURCES DEVELOPMENT Co.,Ltd. Address before: 230001 Wuhu Road, Anhui, China, No. 325, No. Patentee before: ANHUI CONSTRUCTION ENGINEERING GROUP Co.,Ltd. |
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Address after: 233000 South Side of Zhanggongshan Road, Donghai Avenue, Bengbu City, Anhui Province Patentee after: Anhui Construction Engineering Group Co.,Ltd. Address before: 233000 South Side of Zhanggongshan Road, Donghai Avenue, Bengbu City, Anhui Province Patentee before: ANHUI WATER RESOURCES DEVELOPMENT Co.,Ltd. |
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Effective date of registration: 20220426 Address after: 244100 third floor, management committee of Yi'an Economic Development Zone, Yi'an District, Tongling City, Anhui Province Patentee after: Anhui Construction Engineering Changjiang Construction Investment Co.,Ltd. Patentee after: Anhui Construction Engineering Group Co.,Ltd. Address before: 233000 South Side of Zhanggongshan Road, Donghai Avenue, Bengbu City, Anhui Province Patentee before: Anhui Construction Engineering Group Co.,Ltd. |