CN105019350B - Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams - Google Patents
Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams Download PDFInfo
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- CN105019350B CN105019350B CN201410179643.7A CN201410179643A CN105019350B CN 105019350 B CN105019350 B CN 105019350B CN 201410179643 A CN201410179643 A CN 201410179643A CN 105019350 B CN105019350 B CN 105019350B
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Abstract
The invention relates to a prefabricated T-shaped beam and a method of building a continuous beam bridge by adopting the prefabricated T-shaped beams, and belongs to the field of bridge engineering. The T-shaped beam is an improved form of the conventional prefabricated T-shaped beam, and bottom flanges are additionally arranged at the ends, so that the cross sections of the ends are I-shaped. Longitudinal prestressed ducts are formed in the bottom flanges, and the longitudinal prestressed ducts are also formed in top plates of the ends. The bridge is formed in a manner that the prefabricated T-shaped beams are spliced, simply supported and then connected. Longitudinal prestress is tensioned on the bottom flanges, and negative bending moment prestress is tensioned on the top plates. Certain prestress is exerted on compressed zones at the bottoms, so that cracks under the effects of temperature and the like can be avoided. The compression areas of the bottom flanges are increased, the compressive strain of the compressed zones is decreased under the effect of negative bending moment, correspondingly, the tensile strain at the tops is also decreased and thus the possibility of cracking of the bridge deck can be lowered. As the cross sections of the ends are changed to be I-shaped, transportation and installation are convenient, and the construction of the continuous beam bridge is also convenient. The method of building the continuous beam is convenient to construct, and cracks of the top plates at pier top areas are favorably decreased.
Description
Technical field
The present invention relates to a kind of prefabricated T-shaped beam and the method building continuous bridge with it, belong to science of bridge building field.
Background technology
With the fast development of the high-grade highway of China, higher requirement be it is also proposed to the quality of bridge.Current
Present situation is：For the Bridges on Highway of little across footpath, how in the form of assembled steel reinforced concrete plate beam, Medium Span
Bridge then adopts prefabricated PC concrete T type（Case）The form of beam, for long-span prestressed concrete continuous bridge, mesh
Front construction method mainly adopts balanced cantilever casting method or assembled method.But because the construction complexity of cast-in-situ continuous beam is loaded down with trivial details, take
During expenses of labour, people adopt " simple-supported thencontinuous construction " method, by the batch Prefabrication of simply supported beam and the superiority of continuous beam
Can combine, realization accelerates the construction of continuous beam with the mode of beam or plate batch Prefabrication.Conventional several prefabricated
Liang Zhong, the section bending resistance of T-shaped beam is the strongest, section efficiency index highest, and economic span is maximum, adopts " simple-supported thencontinuous
Construction " method can form the continuous bridge of larger single span.Conventional prefabricated T-shaped beam bottom is one " Horse hoof ", and stability is relatively
Difference, transport and installation are all inconvenient.In continuous system, pier top hogging moment area beam section top tension, bottom is pressurized, and corresponding
The compression area that " Horse hoof " provides is less.In addition, though hogging moment area bottom is compressive region, but the effect due to temperature etc., still
Crackle often occurs.
Content of the invention
For solving its technical problem, scheme of the present invention is：A kind of prefabricated T-shaped beam is provided and is built with it continuous
The method of beam bridge, its prefabricated T-shaped beam is the improved form of conventional prefabricated T-shaped beam.In the end of follow-on T-shaped beam, cross section
Gradate as I-shaped by T-shaped shape from from end 1/8th across to end.Prestressed pore passage can be reserved in lower flange,
Meanwhile, also can there is prestressed pore passage in top flange.
The presstressed reinforcing steel of the lower flange of the T-shaped beam of described modified model adopts finish rolling deformed bar, and corresponding anchorage is YGM type anchor
Tool.
The presstressed reinforcing steel of the described top board of modified model prefabricated T-shaped beam adopts flat anchor, and precast beam upper surface leaves corresponding
Tensioning groove.
Steel is stretched out with contiguous prefabricated lower flange of girder edge is connected laterally leaving in the lower flange of described modified model prefabricated T-shaped beam
Muscle.
The thickness of the described lower flange of modified model prefabricated T-shaped beam is gradually reduced to span centre direction from fulcrum.
Continuous beam can be assembled using described prefabricated T-shaped beam, by rational pouring order of concrete, and apply hogging moment
Area's top board prestressing force and baseboard prestress, can avoid the cracking of hogging moment area top board during use.
The invention has the beneficial effects as follows：Because modified model prefabricated T-shaped beam end section is I-shaped, facilitate transport and pacify
Dress；Hogging moment area bottom applies certain prestressing force, can avoid crackle on web in the presence of temperature etc.；Normal with adopting
The assembled continuous beam of rule prefabricated T-shaped beam is compared, and lower flange increases compression area, and compressive region compressive strain under hogging moment effect subtracts
Little, stretching strain in corresponding floorings also reduces, and can reduce the probability of bridge floor cracking.
Brief description
One of prefabricated T-shaped beam schematic diagram in Fig. 1 present invention；
The cross-sectional view of prefabricated T-shaped beam end in Fig. 2 present invention；
The cross-sectional view in prefabricated T-shaped beam stage casing in Fig. 3 present invention；
The two of prefabricated T-shaped beam schematic diagram in Fig. 4 present invention.
In figure marks：1. top flange, 2. web, 3. Horse hoof, 4. lower flange, 5. the longitudinally connected muscle in lower flange tooth block, 6. negative
Moment of flexure muscle tensioning groove, 7. lower flange prestressed pore passage, 8. negative bending moment rib duct, 9. top flange lateral connection muscle, 10. top flange
Longitudinally connected muscle, 11. web dowels.
Specific embodiment
Embodiment one
First embodiment of the present invention is prefabricated T-shaped beam as shown in Figure 1 and the method building continuous beam with it.This T
Type beam is the improved form of conventional prefabricated T-shaped beam, the horse in end 1/8th span scope at every end, under T-shaped web 2
Hoof 3 position increased the lower flange 4 of Varying-thickness, and the thickness of lower flange 4 is gradually reduced to span centre direction from end.Thus end
Transverse section is in as shown in Figure 2 I-shaped, has lower flange prestressed pore passage 7 in lower flange 4, using finish rolling deformed bar and corresponding
YGM type anchorage.There is negative bending moment rib duct 8, presstressed reinforcing steel adopts flat anchor, precast beam upper surface is reserved with correspondence in the top board of end
Negative bending moment rib tensioning groove 6.Reinforcing bar is stretched out with contiguous prefabricated T-shaped beam top flange is connected laterally leaving in top flange, i.e. upper limb
Edge lateral connection muscle 9.The cross-sectional view in stage casing is as shown in Figure 3.Construction party using this prefabricated T-shaped beam assembly continuous bridge
Method comprises the following steps：
Step one, the structure of Simply supported non-uniform bridge of being carried out according to design parameters such as bridge class, span, bridge deck widths
Analysis, calculates sectional dimension, regular reinforcement and the longitudinal prestressing reinforcing bar determining T-shaped beam, relatively security consideration, also can directly press
The T-shaped beam of uiform section is calculated and is analyzed；
Step 2, prefabricated this kind of prefabricated T-shaped beam；
Temporary support is placed, each T-shaped beam corresponding has two interim at one end on step 3, the pier in completion, platform
Seat, is arranged symmetrically under the lower flange 4 of web both sides, the T-shaped beam of erecting；
Step 4, connection diaphragm plate connect reinforcing bar, top flange 1 lateral connection reinforcing bar, connect corresponding bridge pier position in same
The longitudinally connected muscle in top flange 10 put and web dowel 11, and connect presstressed reinforcing steel duct at this, installation form, lay permanent
To pier top diaphragm, corresponding each T-shaped web 2 position of center line lays one to bearing；
Step 5, the middle diaphragm plate pouring simple span connect concrete；
Top flange in 3/4ths length of span in the middle part of step 6, primary concreting simple span connects concrete and bridge floor
Mat formation concrete；
Step 7, the anticollision barrier pouring in 3/4ths length of span in the middle part of simple span；
Step 8, pour lower flange 4 connect concrete, pour continuous segment joint（Including pier top crossbeam）Concrete, herein
Using slightly expanded concrete；
Step 9, the prestressing force applying in hogging moment section top flange, apply the prestressing force in lower flange；
Step 10, dismounting temporary support, pour the remaining anticollision barrier near pier top, complete other appurtenant works.
Embodiment two
Second embodiment of the present invention is the modification to first embodiment, and prefabricated T-shaped beam is as shown in Figure 4.Lower flange 4
Inside there is longitudinal lower prestress duct 7, using steel strand wires as presstressed reinforcing steel, accordingly adopt flat anchor, and have corresponding anchoring
Use tooth block.
Embodiment three
3rd embodiment of the present invention is the modification to first embodiment, and prefabricated T-shaped lower flange of girder edge is in longitudinal entrance
Span centre uiform section segment limit, reinforcing bar is stretched out with contiguous prefabricated T-shaped lower flange of girder edge is connected laterally leaving in lower flange.
Claims (9)
1. a kind of prefabricated T-shaped beam it is characterised in that：This T-shaped beam is the improved form of conventional prefabricated T-shaped beam, and end increased down
The edge of a wing, thus the transverse section of end is in I-shaped.
2. as claimed in claim 1 a kind of prefabricated T-shaped beam it is characterised in that：There is longitudinal prestressing hole in T-shaped lower flange of girder edge
, also there is longitudinal prestressing duct in road in the top board of end, the presstressed reinforcing steel in the top board of end adopts flat anchor, and precast beam upper surface is reserved
There is corresponding tensioning groove.
3. as claimed in claim 2 a kind of prefabricated T-shaped beam it is characterised in that：The presstressed reinforcing steel of prefabricated T-shaped lower flange of girder edge adopts
YGM type anchorage.
4. as claimed in claim 3 a kind of prefabricated T-shaped beam it is characterised in that：T-shaped beam top flange laterally leave pre- with adjacent
That makes the connection of T-shaped beam top flange stretches out reinforcing bar.
5. as claimed in claim 3 a kind of prefabricated T-shaped beam it is characterised in that：The thickness of T-shaped lower flange of girder edge is from end to span centre
Direction is gradually reduced.
6. as claimed in claim 3 a kind of prefabricated T-shaped beam it is characterised in that：From this T-shaped beam from away from end 1/8th across position
Put beginning, T soffit of girder plate thickness changes.
7. as claimed in claim 2 a kind of prefabricated T-shaped beam it is characterised in that：The presstressed reinforcing steel of T-shaped lower flange of girder edge adopts flat
Anchor, and have corresponding anchoring tooth block.
8. as claimed in claim 3 a kind of prefabricated T-shaped beam it is characterised in that：T-shaped lower flange of girder edge laterally leave pre- with adjacent
That makes T-shaped lower flange of girder edge connection stretches out reinforcing bar.
9. a kind of prefabricated T-shaped beam as claimed in claim 3, builds the construction method of continuous bridge with it and mainly includes following step
Suddenly：
Step one, carry out the structural analyses of Simply supported non-uniform bridge according to design parameters such as bridge class, span, bridge deck widths,
Calculate sectional dimension, regular reinforcement and the longitudinal prestressing reinforcing bar determining T-shaped beam, relatively security consideration, also can directly press to wait and cut
The T-shaped beam in face is calculated and is analyzed；
Step 2, prefabricated this kind of prefabricated T-shaped beam；
Temporary support is placed, each T-shaped beam corresponding has two temporary supports at one end, right on step 3, the pier in completion, platform
Title is arranged under the lower flange of web both sides, the T-shaped beam of erecting；
Step 4, connection diaphragm plate connect reinforcing bar, top flange lateral connection reinforcing bar, connect and correspond to the upper of pier location in same
The longitudinally connected reinforcing bar in the edge of a wing, and connect presstressed reinforcing steel duct at this, installation form, lay permanent bearing and design to pier top diaphragm
Under position, corresponding each T-shaped web position of center line lays one；
Step 5, the middle diaphragm plate pouring simple span connect concrete；
Top flange in 3/4ths length of span in the middle part of step 6, primary concreting simple span connects concrete and deck paving
Concrete；
Step 7, the anticollision barrier pouring in 3/4ths length of span in the middle part of simple span；
Step 8, pour lower flange connect concrete, pour continuous segment joint concrete；
Step 9, the prestressing force applying in hogging moment section top flange, apply the prestressing force in lower flange；
Step 10, dismounting temporary support, pour the remaining anticollision barrier near pier top, complete other appurtenant works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410179643.7A CN105019350B (en) | 2014-04-30 | 2014-04-30 | Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410179643.7A CN105019350B (en) | 2014-04-30 | 2014-04-30 | Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams |
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| CN105019350A CN105019350A (en) | 2015-11-04 |
| CN105019350B true CN105019350B (en) | 2017-02-15 |
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| CN201410179643.7A Expired - Fee Related CN105019350B (en) | 2014-04-30 | 2014-04-30 | Prefabricated T-shaped beam and method of building continuous beam bridge by adopting prefabricated T-shaped beams |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192718A (en) * | 2016-08-29 | 2016-12-07 | 广东冠生土木工程技术有限公司 | A kind of can the bridge of quick-assembling and manufacture method thereof |
| CN107142829A (en) * | 2017-07-06 | 2017-09-08 | 内蒙古综合交通科学研究院有限责任公司 | A kind of transverse prestress I-shaped box-beam structure |
| CN107761557B (en) * | 2017-09-27 | 2019-02-22 | 清华大学 | A kind of precast concrete T-beam lateral connection piece construction and construction method |
| CN111379225A (en) * | 2020-03-31 | 2020-07-07 | 浙江交工集团股份有限公司 | Assembly type T beam tensioned on bridge floor by round corrugated pipe hogging moment steel beam |
| CN112252190A (en) * | 2020-10-10 | 2021-01-22 | 中路杜拉国际工程股份有限公司 | Prefabricating construction method for pi-shaped beam of ultra-high performance concrete pedestrian overpass |
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| US5893187A (en) * | 1995-04-21 | 1999-04-13 | Kyouryou Hozen Inc. | Reinforcing structure for hinge section of gerber bridge |
| KR20040049354A (en) * | 2002-12-03 | 2004-06-12 | 노윤근 | Prestressed preflextion H-beam and method for building a T-shaped bridge pier using the H-beam |
| KR100892163B1 (en) * | 2008-09-01 | 2009-04-10 | (주)비엔텍아이엔씨 | Tensile stress control method of prestressed concrete beam using temporary steel member |
| CN101570960A (en) * | 2009-05-08 | 2009-11-04 | 北京市市政专业设计院有限责任公司 | Fastening method of T-shaped beam bridge |
| CN201669773U (en) * | 2010-05-04 | 2010-12-15 | 杨秋利 | Mobile T-beam and I-beam template system |
| CN202688845U (en) * | 2012-08-10 | 2013-01-23 | 上海市城市建设设计研究总院 | Prestress concrete precast beam |
| CN102926318A (en) * | 2011-08-11 | 2013-02-13 | 同济大学 | Fully assembled emergency combination bridge device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204059178U (en) * | 2014-04-30 | 2014-12-31 | 郑州大学 | A kind of prefabricated T-shaped beam |
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2014
- 2014-04-30 CN CN201410179643.7A patent/CN105019350B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5893187A (en) * | 1995-04-21 | 1999-04-13 | Kyouryou Hozen Inc. | Reinforcing structure for hinge section of gerber bridge |
| KR20040049354A (en) * | 2002-12-03 | 2004-06-12 | 노윤근 | Prestressed preflextion H-beam and method for building a T-shaped bridge pier using the H-beam |
| KR100892163B1 (en) * | 2008-09-01 | 2009-04-10 | (주)비엔텍아이엔씨 | Tensile stress control method of prestressed concrete beam using temporary steel member |
| CN101570960A (en) * | 2009-05-08 | 2009-11-04 | 北京市市政专业设计院有限责任公司 | Fastening method of T-shaped beam bridge |
| CN201669773U (en) * | 2010-05-04 | 2010-12-15 | 杨秋利 | Mobile T-beam and I-beam template system |
| CN102926318A (en) * | 2011-08-11 | 2013-02-13 | 同济大学 | Fully assembled emergency combination bridge device |
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Inventor after: Wei Jiandong Inventor after: Ma Zhe Inventor after: Zhou Jide Inventor after: Yan Songling Inventor after: Wang Zhijie Inventor after: Zhang Li Inventor after: Fan Bing Inventor after: Ma Yifan Inventor before: Wei Jiandong Inventor before: Xu Ping Inventor before: Ma Yifan |
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