CN202047377U - Reinforcing structure of concrete box girder - Google Patents

Reinforcing structure of concrete box girder Download PDF

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Publication number
CN202047377U
CN202047377U CN2011201258987U CN201120125898U CN202047377U CN 202047377 U CN202047377 U CN 202047377U CN 2011201258987 U CN2011201258987 U CN 2011201258987U CN 201120125898 U CN201120125898 U CN 201120125898U CN 202047377 U CN202047377 U CN 202047377U
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CN
China
Prior art keywords
web
box girder
concrete
concrete box
base plate
Prior art date
Application number
CN2011201258987U
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Chinese (zh)
Inventor
杨毅
刘伟
李正祥
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中铁二院工程集团有限责任公司
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Priority to CN2011201258987U priority Critical patent/CN202047377U/en
Application granted granted Critical
Publication of CN202047377U publication Critical patent/CN202047377U/en

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Abstract

A reinforcing structure of a concrete box girder has a simple structure; carried forces are clear; and added self weight of a girder body is not much. A concrete box girder is composed of a top board (11), a base plate (12) and a web (13); a reinforced concrete thickening layer (131) which is integrated with the web into one body is arranged at an inner side of the web (13); a vertical prestressed steel beam (20) which vertically passes through and is bonded with the reinforced concrete thickening layer (131) is arranged; upper and lower ends of the vertical prestressed steel beam (20) are respectively connected with the top board (11) and the base plate (12) in an anchoring manner.

Description

Concrete box girder is reinforced structure

Technical field

The utility model relates to concrete box girder, and particularly a kind of concrete box girder is reinforced structure.

Background technology

The bridge that has disease is reinforced, and is that major bearing structures, member and the relevant portion thereof to bridge taked enhancing, local replacing or adjusted measures such as its internal force, makes it satisfy existing design specifications requirement.The normal method that adopts of bridge strengthening has: increasing section reinforcing method, affixing steel plate reinforcement method, stickup fibrous composite reinforcing method, external prestressing strengthening method, change structural system reinforcing method.At different bridge types, different diseases adopts different reinforcement means.For concrete box girder, if there is the disease of sloping section shear resistance deficiency, above-mentioned preceding four kinds of reinforcement means can adopt alone or in combination.And than under the serious situation, often based on increasing section reinforcing method and external prestressing strengthening method, other two kinds of methods are auxilliary in disease.

The increasing section reinforcing method, be to join reinforcing bar, to improve the method for its bearing capacity and rigidity, for concrete box girder by increasing the former member section area of bridge and increasing, adopt concreting to thicken the web thickness of its box section, can effectively improve its sloping section shear resistance.But than serious situation, it is too much to thicken web for the concrete box girder disease, because concrete density is bigger, will cause the deadweight of beam body to increase too much, increases the burden that other parts of bridge comprise the basis.

The external prestressing strengthening method is by applying external prestressing, making the stressed method that improves or adjust of former bridge construction, member.For concrete box girder, the arrangement that external prestressing is common, be adopt prestressed strand along along bridge in case, arranging, and vertically tilting in web shearing resistance zone.There is following several respects deficiency in this method: influence case back plate, bottom slab stress; Prestressed strand need be provided with steering block in the bending place, in anchoring place anchor block need be set, so that location and anchoring steel bundle, steering block and anchor block complex structure, and the bad processing of its local pressure; Prestressed strand stretch-draw needs certain space, if case beam inner space is narrow and small, will be difficult to operation.

For improving the sloping section shear resistance of concrete box girder, another arrangement of external prestressing, be to adopt vertical prestressing steel bundle, the suitable bridge in edge is to certain intervals, vertically be arranged in case web one side, its weak point is that external prestressing increases eccentric force at former web place, and weak former web is caused adverse effect.

The utility model content

Technical problem to be solved in the utility model provides a kind of concrete box girder and reinforces structure, and simple structure is stressed clear and definite, and it is few to increase the deadweight of beam body.

The technical scheme that its technical problem that solves the utility model adopts is as follows:

Concrete box girder of the present utility model is reinforced structure, concrete box girder is made of top board, base plate and web, it is characterized in that: the inboard of described web is provided with the fixed with it steel concrete thickening layer of one that is, and be provided with and vertically pass this steel concrete thickening layer and form bonding vertical prestressing steel bundle with it, the two ends up and down of vertical prestressing steel bundle respectively with top board, base plate anchor connection.

The beneficial effects of the utility model are, the thickening web has improved the rigidity and the bearing capacity of web itself, and vertical prestressing steel bundle places web, has reduced eccentric distance, so prestressing force is very little to the eccentric force of web generation, and web stress is not had adverse effect; Web thickness increases few, and it is few therefore to increase the deadweight of beam body, and his position of case Liangqi is comprised that the influence on basis, bottom is very little; The place applies vertical prestressing at web, to the stressed not influence of case back plate, base plate; Simple structure, vertical prestressing steel bundle can directly be anchored on case back plate, the base plate; Prestressed strand places among the web, and prestressing force directly is passed on the web, improves the web shear resistance, and is stressed clear and definite; Vertical prestressing steel bundle can adopt the lower end end that fixes, and the stretch-draw end is done in the upper end, carries out stretch-draw, easy construction, easy operating on bridge floor;

Description of drawings

This manual comprises as next width of cloth accompanying drawing:

Fig. 1 is the structural representation that the utility model concrete box girder is reinforced structure.

Component shown in the figure, toponym and pairing mark: top board 11, base plate 12, web 13, steel concrete thickening layer 131, vertical prestressing steel bundle 20.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further specified.

With reference to Fig. 1, concrete box girder of the present utility model is reinforced structure, and concrete box girder is made of top board 11, base plate 12 and web 13.It is the steel concrete thickening layer 131 of one that the inboard of described web 13 is provided with fixed with it, and be provided with and vertically pass this steel concrete thickening layer 131 and form bonding vertical prestressing steel bundle 20 with it, the two ends up and down of vertical prestressing steel bundle 20 respectively with top board 11, base plate 12 anchorings.Described vertical prestressing steel bundle 20 can adopt prestress wire or indented bars usually, should adopt indented bars for reducing loss of prestress as far as possible.

Concrete box girder of the present utility model is reinforced structure and is implemented, be earlier at concrete box girder top board 11, base plate 12 is arranged the position boring of vertical prestressing steel bundle 20, in the hole, place prestressing force bellows and steel bundle then, the plain bars of while assembling reinforcement concrete thickening layer 131 in the case beam, for strengthening the connection of new-old concrete, also need on the new-old concrete interface, to cut a hole interface processing such as hair, and bar planting, then shuttering carries out building of steel concrete thickening layer 131, after treating that concrete reaches certain intensity, stretch-draw and anchoring vertical prestressing steel bundle 20, last stripping is finished construction.

The above some principle that the utility model concrete box girder is reinforced structure that just explain through diagrams, be not be the utility model to be confined to shown in and in described concrete structure and the scope of application, so every the corresponding modify and equivalent that might be utilized all belongs to the claim that the utility model is applied for.

Claims (2)

1. concrete box girder is reinforced structure, concrete box girder is made of top board (11), base plate (12) and web (13), it is characterized in that: the inboard of described web (13) is provided with the fixed with it steel concrete thickening layer (131) of one that is, and be provided with and vertically pass this steel concrete thickening layer (131) and form bonding vertical prestressing steel bundle (20) with it, the two ends up and down of vertical prestressing steel bundle (20) respectively with top board (11), base plate (12) anchor connection.
2. concrete box girder as claimed in claim 1 is reinforced structure, it is characterized in that: described vertical prestressing steel bundle (20) adopts prestress wire or indented bars.
CN2011201258987U 2011-04-26 2011-04-26 Reinforcing structure of concrete box girder CN202047377U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011201258987U CN202047377U (en) 2011-04-26 2011-04-26 Reinforcing structure of concrete box girder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011201258987U CN202047377U (en) 2011-04-26 2011-04-26 Reinforcing structure of concrete box girder

Publications (1)

Publication Number Publication Date
CN202047377U true CN202047377U (en) 2011-11-23

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Family Applications (1)

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CN2011201258987U CN202047377U (en) 2011-04-26 2011-04-26 Reinforcing structure of concrete box girder

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104233963A (en) * 2014-09-10 2014-12-24 北京工业大学 Prestress-adjustable steel truss for reinforcing PSC (prestressed concrete) continuous box girder bridge and construction method
CN104652293A (en) * 2015-02-01 2015-05-27 北京工业大学 Cable-stayed bridge structure used for reinforcing PSC (Pre-stressed Concrete) continuous box girder bridge and construction method
CN104846753A (en) * 2015-05-28 2015-08-19 大连市市政设计研究院有限责任公司 Bridge deck opening maintaining method
CN105735152A (en) * 2016-04-11 2016-07-06 沈阳建筑大学 Girder baseplate crack reinforced structure for variable-section box girder bridge and construction method thereof
CN105735153A (en) * 2016-04-12 2016-07-06 沈阳建筑大学 Reinforcement structure for inclined cracks in main girder web plate of box girder bridge and construction method thereof
CN105803926A (en) * 2016-04-07 2016-07-27 沈阳建筑大学 Concrete box-girder bridge girder web plate structure and construction method thereof
CN106948279A (en) * 2017-04-17 2017-07-14 中铁第五勘察设计院集团有限公司 A kind of high-speed railway two-wire prefabricated case beam bale handle reinforcement means
CN108193600A (en) * 2018-01-04 2018-06-22 武汉理工大学 Improve the method for long-span continuous rigid-framed bridge cracking resistance and composite structure box beam
CN109537478A (en) * 2018-12-11 2019-03-29 北京工业大学 A kind of concrete box web shear-resistant reinforcing device and method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104233963B (en) * 2014-09-10 2016-02-17 北京工业大学 A kind of adjustable prestressed steel truss for reinforcing PSC Continuous Box Girder Bridge and construction method
CN104233963A (en) * 2014-09-10 2014-12-24 北京工业大学 Prestress-adjustable steel truss for reinforcing PSC (prestressed concrete) continuous box girder bridge and construction method
CN104652293A (en) * 2015-02-01 2015-05-27 北京工业大学 Cable-stayed bridge structure used for reinforcing PSC (Pre-stressed Concrete) continuous box girder bridge and construction method
CN104846753A (en) * 2015-05-28 2015-08-19 大连市市政设计研究院有限责任公司 Bridge deck opening maintaining method
CN105803926A (en) * 2016-04-07 2016-07-27 沈阳建筑大学 Concrete box-girder bridge girder web plate structure and construction method thereof
CN105735152A (en) * 2016-04-11 2016-07-06 沈阳建筑大学 Girder baseplate crack reinforced structure for variable-section box girder bridge and construction method thereof
CN105735152B (en) * 2016-04-11 2017-04-19 沈阳建筑大学 Girder baseplate crack reinforced structure for variable-section box girder bridge and construction method thereof
CN105735153A (en) * 2016-04-12 2016-07-06 沈阳建筑大学 Reinforcement structure for inclined cracks in main girder web plate of box girder bridge and construction method thereof
CN106948279A (en) * 2017-04-17 2017-07-14 中铁第五勘察设计院集团有限公司 A kind of high-speed railway two-wire prefabricated case beam bale handle reinforcement means
CN106948279B (en) * 2017-04-17 2018-08-14 中铁第五勘察设计院集团有限公司 A kind of high-speed railway two-wire prefabricated case beam bale handle reinforcement means
CN108193600A (en) * 2018-01-04 2018-06-22 武汉理工大学 Improve the method for long-span continuous rigid-framed bridge cracking resistance and composite structure box beam
CN108193600B (en) * 2018-01-04 2019-06-25 武汉理工大学 Improve the method and composite structure box beam of long-span continuous rigid-framed bridge cracking resistance
CN109537478A (en) * 2018-12-11 2019-03-29 北京工业大学 A kind of concrete box web shear-resistant reinforcing device and method
CN109537478B (en) * 2018-12-11 2020-08-21 北京工业大学 Shear-resisting reinforcing device and method for concrete box girder web

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