CN104264574B - Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof - Google Patents
Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof Download PDFInfo
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- CN104264574B CN104264574B CN201410540192.5A CN201410540192A CN104264574B CN 104264574 B CN104264574 B CN 104264574B CN 201410540192 A CN201410540192 A CN 201410540192A CN 104264574 B CN104264574 B CN 104264574B
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- prestressing tendon
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- 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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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
For solving the easy generation crack that prior art precast concrete beam bridge exists, the lateral connection strength and stiffness of small box girder or T beam are caused to reduce, have a strong impact on the problem such as application life and security performance of precast concrete beam bridge, the present invention proposes a kind of Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, second prestressing tendon and the first prestressing tendon reverse symmetry are arranged.Advantageous Effects of the present invention is effectively improve the lateral connection strength and stiffness of small box girder or T beam, improve the holistic resistant behavior of precast concrete beam bridge, ensure that the long-term behaviour of bridge is stablized and military service safety, there is good Social and economic benef@.
Description
Invention field
What the present invention relates to Mid and minor spans precast concrete beam bridge prestressing tendon arranges technology, is related specifically to a kind of Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof.
Background technology
Along with Bridges in Our Country build flourish, the form of structure of bridge is also abundanter.But major part still adopts reinforced concrete beam or prestressed concrete beam structure for the highway bridge of Mid and minor spans, Urban Bridge and railroad bridge.Wherein, the precast concrete beam bridge of Mid and minor spans has larger cross section torsional strength and flexural strength due to it, its flexural stress figure is reasonable, shear stress is little and have the advantages such as good stability, high-grade highway driving high speed, steady and comfortable requirement can be met well, and have the features such as low price, speed of application be fast concurrently, therefore, obtain development very rapidly at home and abroad and apply widely.
The precast concrete beam bridge of so-called Mid and minor spans refers to the crossstructure adopting precast concrete small box girder or T beam as girder, and wherein, more representational is adopt precast concrete small box girder as the small box girder bridge of girder.For ensureing, between multi-disc small box girder, there are reliable lateral connection strength and stiffness, overall stressed under ensureing the effect of bridge outer load, make internal stress more even each girder distribution, adopt diaphragm and bridge deck that multi-disc girder is linked and become spatial integral structure, external load effect is evenly distributed, each girder collaborative work.Except diaphragm, small box girder is also by the seam between wing plate, and deck structure makes jointly stressed to each other.But, because construction method is improper, maintenance not and the reason such as overload of vehicle, precast concrete small box girder bridge still can produce some diseases, and modal disease is exactly occur too much and excessive crack.The appearance in crack not only can reduce the transverse strength of girder and rigidity, weaken the transverse splicing intensity of pontic, also some endurance issues such as corrosion of steel bar can be caused, precast concrete beam bridge transverse integral even may be caused to be damaged, formation single-beam is stressed, has a strong impact on application life and the security performance of precast concrete beam bridge.Obviously, prior art precast concrete beam bridge also exists and easily produces crack, causes the lateral connection strength and stiffness of small box girder or T beam to reduce, and has a strong impact on the problem such as application life and security performance of precast concrete beam bridge.
Summary of the invention
For solving the easy generation crack that prior art precast concrete beam bridge exists, the lateral connection strength and stiffness of small box girder or T beam are caused to reduce, have a strong impact on the problem such as application life and security performance of precast concrete beam bridge, the present invention proposes a kind of Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof.Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon and the first prestressing tendon reverse symmetry are arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse.
Further, the first prestressing tendon of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention and the second prestressing tendon are 30mm-300mm in the spacing of short transverse.
Mid and minor spans precast concrete beam bridge prestressing tendon structure setting method of the present invention, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon and the first prestressing tendon phase-inversion symmetric are arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse; Wherein, every 2-5 root small box girder or T beam are one group, and the first prestressing tendon and the second prestressing tendon are 30mm-300mm in the spacing of short transverse, comprise the following steps:
S1, according to design drawing, reserved duct of installing X-shaped prestressing tendon, builds small box girder or T beam;
S2, when after the intensity that the concrete of building reaches certain, prestressing tendon is penetrated into reserved duct;
S3, arrange after, stretch-draw is carried out to the prestressing tendon that this is X-shaped simultaneously, makes prestressing force reach designing requirement;
S4, complete this group intersect prestressing tendon stretch-draw after, carry out layout and the stretch-draw of another group prestressing tendon adjacent;
S5, stretch-draw is carried out to each longitudinal prestressing strands, ensure end cross-sectional prestressing tendon symmetrical arrangement;
S6, Seal treatment is entered to each prestressing tendon end anchor fixed end.
The Advantageous Effects of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention and method to set up thereof is effectively improve the lateral connection strength and stiffness of small box girder or T beam, improve the holistic resistant behavior of precast concrete beam bridge, ensure that the long-term behaviour of bridge is stablized and military service safety, there is good Social and economic benef@.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic perspective view of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention;
Accompanying drawing 2 be Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention overlook cross-sectional schematic;
Accompanying drawing 3 is the partial schematic diagram of Mid and minor spans precast concrete beam bridge prestressing tendon structure small box girder of the present invention or T beam end.
Below in conjunction with drawings and the specific embodiments, Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention and method to set up thereof are further described.
Detailed description of the invention
Accompanying drawing 1 is the schematic perspective view of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention, accompanying drawing 2 be Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention overlook cross-sectional schematic, accompanying drawing 3 is the partial schematic diagram of Mid and minor spans precast concrete beam bridge prestressing tendon structure small box girder of the present invention or T beam end.In figure, 1 is small box girder, and 2 is longitudinal prestressing strands, and 3 is the first prestressing tendon, and 4 is the second prestressing tendon.As seen from the figure, Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder 1 or T beam, longitudinal prestressing strands 2 is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder 1 or T beam, namely a termination of the first prestressing tendon 3 is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon 4 and the first prestressing tendon 3 phase-inversion symmetric are arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse.It should be noted that, in fig. 1, for clearly describing the structure of X-shaped prestressing tendon, only show two terminations of small box girder in figure, the longitudinal prestressing strands bottom small box girder does not draw, and show only the end points arranging longitudinal prestressing strands bottom small box girder.
Usually, according to design specifications, in bridge, the layout of prestressing tendon does not allow arranged crosswise, therefore, Mid and minor spans precast concrete beam bridge prestressing tendon structure first prestressing tendon of the present invention and the second prestressing tendon are 30mm-300mm in the spacing of short transverse, thus avoid the shortcoming of prestressing tendon diagonal cross.
Mid and minor spans precast concrete beam bridge prestressing tendon structure setting method of the present invention, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon and the first prestressing tendon direction are symmetrical arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse; Wherein, every 2-5 root small box girder or T beam are one group, and the first prestressing tendon and the second prestressing tendon are 30mm-300mm in the spacing of short transverse, comprise the following steps:
S1, according to design drawing, reserved duct of installing X-shaped prestressing tendon, builds small box girder or T beam;
S2, when after the intensity that the concrete of building reaches certain, prestressing tendon is penetrated into reserved duct;
S3, arrange after, stretch-draw is carried out to the prestressing tendon that this is X-shaped simultaneously, makes prestressing force reach designing requirement;
S4, complete this group intersect prestressing tendon stretch-draw after, carry out layout and the stretch-draw of another group prestressing tendon adjacent;
S5, stretch-draw is carried out to each longitudinal prestressing strands, ensure end cross-sectional prestressing tendon symmetrical arrangement;
S6, Seal treatment is entered to each prestressing tendon end anchor fixed end.
Analyze from the intersection presstressed reinforcing steel of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention, it longitudinally can answer component effect for small box girder provides on the one hand in advance, thus plays original longitudinal prestressing strands effect; Can provide on the other hand and laterally answer component effect in advance, thus play the transverse splicing effects such as original diaphragm, compared with common transverse prestress bundle, there is the advantage that loss of prestress is little.Thered is provided by intersection prestressing tendon and longitudinally, laterally answer component effect in advance, the lateral ties between small box girder can be strengthened greatly, strengthen the integral rigidity between case beam, improve the integrated carrying ability of case beam.In addition, the prestressing tendon that intersects is arranged on the layout that wet seam both sides do not affect the prestressing tendon of small box girder inside, while providing longitudinally, laterally answering component effect in advance, certain constraint effect is played to the concrete in wet seam, the entire compression ability of further Concrete Structure.Further, compared with transverse prestress bundle, the prestressing tendon that intersects greatly reduces the transverse prestress loss because the reasons such as length cause.Meanwhile, in beam body, at the end points section of each prestressing tendon, prestressing tendon is arranged symmetrically with, and ensure that the symmetrically and evenly stressed of cross section, construction safety.
Obviously, the Advantageous Effects of Mid and minor spans precast concrete beam bridge prestressing tendon structure of the present invention and method to set up thereof is effectively improve the lateral connection strength and stiffness of small box girder or T beam, improve the holistic resistant behavior of precast concrete beam bridge, ensure that the long-term behaviour of bridge is stablized and military service safety, there is good Social and economic benef@.
Claims (3)
1. a Mid and minor spans precast concrete beam bridge prestressing tendon structure, it is characterized in that, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon and the first prestressing tendon reverse symmetry are arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse.
2. Mid and minor spans precast concrete beam bridge prestressing tendon structure according to claim 1, it is characterized in that, the first prestressing tendon and the second prestressing tendon are 30mm-300mm in the spacing of short transverse.
3. a Mid and minor spans precast concrete beam bridge prestressing tendon structure setting method, it is characterized in that, in same group of small box girder or the both sides of T beam and the bottom of every root small box girder or T beam, longitudinal prestressing strands is set, the prestressing tendon of two decussates is set in the wet seam both sides of adjacent two small box girder or T beam, namely a termination of the first prestressing tendon is arranged on the wing plate root of small box girder or T beam, then along the longitudinal extension of small box girder or T beam, and another termination is arranged on the wing plate root of adjacent small box girder or T beam; Second prestressing tendon and the first prestressing tendon phase-inversion symmetric are arranged; Further, the first prestressing tendon and the second prestressing tendon leave spacing in short transverse; Wherein, every 2-5 root small box girder or T beam are one group, and the first prestressing tendon and the second prestressing tendon are 30mm-300mm in the spacing of short transverse, comprise the following steps:
S1, according to design drawing, reserved duct of installing X-shaped prestressing tendon, builds small box girder or T beam;
S2, when after the intensity that the concrete of building reaches certain, prestressing tendon is penetrated into reserved duct;
S3, arrange after, stretch-draw is carried out to the prestressing tendon that this is X-shaped simultaneously, makes prestressing force reach designing requirement;
S4, complete this group intersect prestressing tendon stretch-draw after, carry out layout and the stretch-draw of another group prestressing tendon adjacent;
S5, stretch-draw is carried out to each longitudinal prestressing strands, ensure end cross-sectional prestressing tendon symmetrical arrangement;
S6, Seal treatment is entered to each prestressing tendon end anchor fixed end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410540192.5A CN104264574B (en) | 2014-10-14 | 2014-10-14 | Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410540192.5A CN104264574B (en) | 2014-10-14 | 2014-10-14 | Mid and minor spans precast concrete beam bridge prestressing tendon structure and method to set up thereof |
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| Publication Number | Publication Date |
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| CN104264574A CN104264574A (en) | 2015-01-07 |
| CN104264574B true CN104264574B (en) | 2016-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105821751B (en) * | 2016-06-16 | 2017-06-30 | 赵坤 | A kind of section is double X-type bridge |
| CN110983940B (en) * | 2019-11-25 | 2024-04-12 | 清华大学 | Precast concrete box girder bridge and construction method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3794433A (en) * | 1971-07-08 | 1974-02-26 | Schupack Ass | Segmental precast concrete post-tensioned overpass bridges with cantilevered abutment |
| CN1088136C (en) * | 1997-05-30 | 2002-07-24 | 交通部第二公路勘察设计院 | Concrete box beam vertically locked by prestressed flat bolt and its production methed |
| CN201125534Y (en) * | 2007-11-22 | 2008-10-01 | 王用中 | Prestress beam pull plate-type bending machine |
| KR101012759B1 (en) * | 2008-11-11 | 2011-02-08 | 한국건설기술연구원 | Box Girder Having Hybrid Cantilever and Bridge Using Such Box Girder |
| KR20100069857A (en) * | 2008-12-17 | 2010-06-25 | 재단법인 포항산업과학연구원 | Girder segment for continuous support and manufacturing method thereof |
| KR101222620B1 (en) * | 2012-05-10 | 2013-02-06 | 주식회사 젬콘 | Prestressed concrete girder and it's manufacture and construction method which used pretensioning steel plate |
| CN204112199U (en) * | 2014-10-14 | 2015-01-21 | 重庆交通大学 | Mid and minor spans precast concrete beam bridge prestressing tendon structure |
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