CN201526006U - Prestressed concrete continuous box girder - Google Patents

Prestressed concrete continuous box girder Download PDF

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Publication number
CN201526006U
CN201526006U CN2009202359085U CN200920235908U CN201526006U CN 201526006 U CN201526006 U CN 201526006U CN 2009202359085 U CN2009202359085 U CN 2009202359085U CN 200920235908 U CN200920235908 U CN 200920235908U CN 201526006 U CN201526006 U CN 201526006U
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CN
China
Prior art keywords
tendon
box girder
plate
vertical
continuous box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN2009202359085U
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Chinese (zh)
Inventor
朱晓文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JSTI Group Co Ltd
Original Assignee
Jiangsu Transportation Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN2009202359085U priority Critical patent/CN201526006U/en
Application granted granted Critical
Publication of CN201526006U publication Critical patent/CN201526006U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a prestressed concrete continuous box girder capable of preventing a web-plate oblique crack and a bottom-plate longitudinal crack. The prestreesed concrete continuous box girder comprises a top plate, a web plate and a bottom plate, wherein a vertical tendon is arranged in the web plate and a horizontal tendon is arranged in the bottom plate and the vertical and horizontal tendons are arranged in a prestressed corrugated pipe and the vertical tendon and the horizontal tendon are integrated to form a U shaped tendon. The web plate vertical tendon of the prestressed concrete continuous box girder is combined with the bottom plate horizontal tendon and the U shaped tendon formed by same tendon is stretched and the tendon length is greatly increased and the prestress loss is reduced. The prestressed concrete continuous box girder is more effective and economic in aspect of reducing the prestress compared with the traditional way.

Description

Prestressed concrete continuous box girder
Technical field
The invention belongs to civil engineering bridge field, be specifically related to a kind of prestressed concrete continuous box girder.
Background technology
In prestressed concrete continuous beam, prestressed reinforcement has three kinds altogether, is respectively vertical, horizontal and vertical prestressing bar.Prestressed concrete continuous box girder usually adopts vertical prestressing bar and longitudinal prestressing muscle to make up to reduce the web principal tensile stress, reduces the generation of diagonal crack.Vertical prestressing is very big to reducing the principal tensile stress contribution in theory, but because deck-molding is less, vertical prestressing bar is shorter, causes the loss of prestress large percentage.By the loss of prestress formula as can be known, when the prestressed thick reinforcement anchored end has construction wrong slightly or all may cause very big loss of prestress because of concrete elastic compression, temperature effect etc., so when construction tubbiness presstressed reinforcing steel will to reach designing requirement usually very difficult, this just causes actual vertical prestressing very little, and certain structures even prestressing force disappear.A lot of actual vertical prestressings are less than 50% of design load, and the high 2 meters left and right sides case beams of some fine strain of millet have only 20%~30% of design load.The bridge design that in addition has adopts in the limit bigger than normal and strides ratio, the excessive principal tensile stress that increases end bay of end bay.The longitudinal crack of web is then mostly be because the lateral stress that longitudinal prestressing stretch-draw produces and between the stage concrete shrinkage difference cause.All there is bigger influence in these cracks to the durability of bridge or even bearing capacity etc.If do not paid attention to cause serious consequence.And if base plate occurs and stretch-draw transverse prestress muscle in order to prevent the base plate longitudinal crack, also exist prestressing force to lack and cause the too small secret worry of actual prestressing force.
Therefore, study a kind of simple and effective and practical prestressed concrete continuous box girder prestressed concrete continuous box girder web diagonal crack and base plate longitudinal crack are prevented and treated, the assurance of prestressed concrete continuous box girder bridge quality is had significance.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art, and a kind of prestressed concrete continuous box girder that can prevent web diagonal crack and base plate longitudinal crack is provided.
The technical scheme that realizes the utility model purpose is, prestressed concrete continuous box girder, comprise top board, web and base plate, be provided with vertical prestressing bar in the web, be provided with the transverse prestress muscle in the base plate, vertical and transverse prestress muscle is located in the prestressing force bellows, it is characterized in that described vertical prestressing bar and transverse prestress muscle are the U-shaped presstressed reinforcing steel that is wholely set.
Described vertical prestressing bar and transverse prestress muscle are the U-shaped presstressed reinforcing steel that is wholely set, be that vertical prestressing bar and transverse prestress muscle are located on the same muscle, web vertical presstressed reinforcing steel and base plate transverse prestress muscle also are in the same place, make the U-shaped tension of prestressed tendon with same presstressed reinforcing steel, presstressed reinforcing steel length at this moment becomes 2 times of vertical prestressing bars and adds transverse prestress muscle length.
The beneficial effects of the utility model are, with the web vertical presstressed reinforcing steel of Prestressed Continuous Box Beam and base plate transverse prestress adhesion of tendon and muscle after injury also, make the U-shaped tension of prestressed tendon with same presstressed reinforcing steel, presstressed reinforcing steel length will improve greatly, reduce loss of prestress, reduce aspect the loss of prestress more effective, economical than traditional approach.Has clear superiority aspect control web diagonal crack and the base plate longitudinal crack.
Description of drawings
Fig. 1 is the utility model embodiment 1 presstressed reinforcing steel structural representation
The specific embodiment
Be described further below in conjunction with embodiment and accompanying drawing.
Embodiment 1
As shown in Figure 1, prestressed concrete continuous box girder 1, comprise top board 2, web 3 and base plate 4, be provided with vertical prestressing bar 51 in the web 3, be provided with transverse prestress muscle 52 in the base plate 4, vertical and transverse prestress muscle is located in the prestressing force bellows 6, and vertical prestressing bar and transverse prestress muscle are the U-shaped presstressed reinforcing steel 5 that is wholely set.
Implementation process is as follows: before casting prestressed continuous box girder, pre-buried prestressing force bellows 6 on web 3 and base plate 4 as Fig. 1, suitably is provided with reinforcement constitution at the bellows turning earlier, prevents that presstressed reinforcing steel is owing to the effect of radial component collapses.Bellows 6 and other plain barss installed and fixed carry out concrete building, to advance bellows 6 as the steel strand volume bundle of presstressed reinforcing steel 5 then puts on, carry out stretch-draw shown in Figure 1 then, but both two ends simultaneous tensions of stretch-draw, also first anchoring another side stretch-draw on one side, after presstressed reinforcing steel 5 stretch-draw anchors are good, get final product behind the sealing off and covering anchorage.

Claims (2)

1. prestressed concrete continuous box girder, comprise top board, web and base plate, be provided with vertical prestressing bar in the web, be provided with the transverse prestress muscle in the base plate, vertical and transverse prestress muscle is located in the prestressing force bellows, it is characterized in that described vertical prestressing bar and transverse prestress muscle are the U-shaped presstressed reinforcing steel that is wholely set.
2. prestressed concrete continuous box girder according to claim 1 is characterized in that, described prestressing force bellows turning is provided with reinforcement constitution.
CN2009202359085U 2009-09-28 2009-09-28 Prestressed concrete continuous box girder Expired - Lifetime CN201526006U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009202359085U CN201526006U (en) 2009-09-28 2009-09-28 Prestressed concrete continuous box girder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009202359085U CN201526006U (en) 2009-09-28 2009-09-28 Prestressed concrete continuous box girder

Publications (1)

Publication Number Publication Date
CN201526006U true CN201526006U (en) 2010-07-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009202359085U Expired - Lifetime CN201526006U (en) 2009-09-28 2009-09-28 Prestressed concrete continuous box girder

Country Status (1)

Country Link
CN (1) CN201526006U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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
CN108532438A (en) * 2018-03-30 2018-09-14 中交路桥北方工程有限公司 A kind of small curved bridge box beam of karst region high-pier large-span
CN109763603A (en) * 2019-03-11 2019-05-17 江南大学 A kind of wave inception shape steel-concrete combined beam

Cited By (4)

* Cited by examiner, † Cited by third party
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
CN108532438A (en) * 2018-03-30 2018-09-14 中交路桥北方工程有限公司 A kind of small curved bridge box beam of karst region high-pier large-span
CN109763603A (en) * 2019-03-11 2019-05-17 江南大学 A kind of wave inception shape steel-concrete combined beam
CN109763603B (en) * 2019-03-11 2020-08-04 江南大学 Wave-forming steel-concrete combined beam

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Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
CP01 Change in the name or title of a patent holder

Address after: 211112 No. 223 Simon Street, Jiangsu, Nanjing

Patentee after: Group Plc of Su Jiao section

Address before: 211112 No. 223 Simon Street, Jiangsu, Nanjing

Patentee before: Jiangsu Transportation Research Institute Co., Ltd.

CP01 Change in the name or title of a patent holder
CX01 Expiry of patent term

Granted publication date: 20100714

CX01 Expiry of patent term