CN102653953B - Inner tensioning pre-stressed concrete single-layer variable section plate box-type structure - Google Patents
Inner tensioning pre-stressed concrete single-layer variable section plate box-type structure Download PDFInfo
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- CN102653953B CN102653953B CN2012100680345A CN201210068034A CN102653953B CN 102653953 B CN102653953 B CN 102653953B CN 2012100680345 A CN2012100680345 A CN 2012100680345A CN 201210068034 A CN201210068034 A CN 201210068034A CN 102653953 B CN102653953 B CN 102653953B
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Abstract
The invention relates to an inner tensioning pre-stressed concrete single-layer variable section plate box-type structure of a building. A variable section plate is arranged in the direction parallel to the section of the structure to form a box-type section, the span range of the variable section plate is 7 to 36 meters, prestressed ribs are arranged in the variable section plate, and tensioning grooves are reserved on the plate side faces which have low stress and facilitate construction in the structure; and when concrete reaches the specified strength, the segments of the same prestressed rib bundle are sequentially connected end to end through middle anchors at the tensioning grooves and tensioned, and then the tensioning grooves are plugged. The structure is characterized in that the tensioning grooves are reserved on the plate side faces which have low stress and facilitate construction in the structure, and the prestressed ribs are connected through the middle anchors and tensioned. The structure has the advantages that when the ends of a structural member do not have tensioning and anchoring conditions, prestressed tensioning anchorage can be realized, high comfort degree, using performance and structural performance can be provided, and the structure is particularly suitable to be used as an underground heavy-duty and large-span single-layer framework box-type structure.
Description
Affiliated technical field
The present invention relates to a kind of post-tensioned prestressed concrete individual layer board of variable section box structure of building, especially when in the plate end, not possessing tension of prestressed tendon, anchoring condition, in the concrete slab side of inside configuration, connect the also post-tensioned prestressed concrete individual layer board of variable section box structure of tensioned prestressing bar.
Background technology
At present, known post-tensioned prestressed concrete individual layer board of variable section box structure is sleeve pipe, distributing bar and the part of first settling post-tensioned prestressing muscle pore-forming, then installation form and concreting.Presstressed reinforcing steel can also can be worn by first threading later.After reaching intensity Deng concrete, with jack with tension of prestressed tendon to the stress that requires and anchor in the two ends of plate, compressive pre-stress is passed to concrete members by the two ends ground tackle.In order to protect presstressed reinforcing steel not corroded and to recover adhesion stress between presstressed reinforcing steel and concrete, the space between presstressed reinforcing steel and sleeve pipe must fill with real with cement paste.Cement paste except playing antisepsis, also is conducive to recover the adhesion stress between presstressed reinforcing steel and concrete.For convenient construction, sometimes also can adopt presstressed reinforcing steel external coating anti-corrosion material and with plastic bushing or oilpaper parcel without bonded post tensioning prestressing force.But,, at the two ends of underground structure member, usually because of stretch-draw prestressing force, need to reserve the stretch-draw groove, cause increasing construction costs, extend the construction period, concerning some engineerings, it is unacceptable extending the construction period.Disclosed on the 11st page of " Guangdong building and building " o. 11th of publishing in November, 2,002 one underground greatly across, heavy structure, this article compares prestressing force and ordinary concrete structure two schemes, and point out: prestressed structure can further reduce the steel concrete consumption of subway station, reduce beam/plate height, so that the station buried depth is less; Station top board span centre maximum distortion is less, and crack resistance is also better; But consider the employing prestressed Construction Technology, construction technology is comparatively complicated, and difficulty of construction is larger, therefore should be cautious use of in the construction of underground station at present.This design final choice ordinary concrete structural concept.Compare with prestressed structure, this ordinary concrete malformation is large, cracking resistance is poor, endurance quality is bad, economy is general, limited greatly across the further application of, heavy structure.
Summary of the invention
require to reserve the deficiency of stretch-draw anchor condition in its end in order to overcome existing post-tensioned prestressed concrete individual layer board of variable section box structure, the invention provides a kind of inner stretch-draw prestressing force concrete individual layer board of variable section box structure, this individual layer board of variable section box structure no longer requires must reserve the stretch-draw anchor condition in its end, but can reserve the stretch-draw groove in the plate side of inside configuration, complete the connection of presstressed reinforcing steel by middle ground tackle in the stretch-draw groove, stretch-draw, this individual layer board of variable section box structure prestressing force drawing process is comparatively simple, duration is relatively short, cost is substantially constant.
Technical scheme of the present invention is:
a kind of inner stretch-draw prestressing force concrete individual layer board of variable section box structure of building, in parallel its section direction, board of variable section is set, form box section, board of variable section span-depth radio scope is at 7～36 meters, presstressed reinforcing steel is set in board of variable section, the stretch-draw groove is reserved in inside configuration stressed less, the plate side of easy construction, when placing of concrete and after reaching prescribed strength, each section head and the tail of same Prestress tendon are linked in sequence by middle ground tackle at stretch-draw groove place, then the arbitrary stretching end in the close inside configuration of middle ground tackle carries out stretch-draw, get final product by designing requirement shutoff stretch-draw groove after stretch-draw is complete, it is characterized in that: the stretch-draw groove is reserved in the side of inside configuration plate, the position of stressed less and easy construction, connect and tensioned prestressing bar by middle ground tackle.
Feature of the present invention also is: the structure cross section is the individual layer box-formed shape, and the board of variable section span L is not less than 7 meters, and dark beam, sleeper form the dark framework of annular, and dark frame spacing is not more than L/3.
Feature of the present invention also is: in board of variable section, presstressed reinforcing steel is similar to traditional board of variable section arrangement of reinforcement, be positive and negative parabolic distribution, the inflection point position is 0.08L～0.12L, the presstressed reinforcing steel that is arranged in side wall and board of variable section forms a loop curve, the prestressing tendon profile is as far as possible consistent with bending moment diagram, as far as possible near the tension edge placement.
Feature of the present invention also is: the bundle shape of presstressed reinforcing steel can be closed curve, can be also non-closed curve; If closed curve, without anchored end; If be non-closed curve, its end is anchored end.
Feature of the present invention also is: every bundle presstressed reinforcing steel is comprised of 2～8 prestress wires, and the spacing of prestressing tendon is according to calculative determination.
Feature of the present invention also is: the stretch-draw groove is reserved in the position of stressed less, easy construction, adopts strengthening measure to be arranged on the surface of board of variable section span centre; The spacing of same prestressing tendon preformed groove and middle ground tackle, need to arrange according to design, and its scope is 15～50 meters.
Feature of the present invention also is: if possess the stretch-draw anchor condition, the stretch-draw groove is reserved in inside configuration or outside component ends and side.
The invention has the beneficial effects as follows, when individual layer board of variable section box structure end does not possess the stretch-draw anchor condition, can realize prestressed stretch-draw, anchoring, be specially adapted to underground heavy duty, greatly across concrete individual layer board of variable section box structure, comfort level and functional performance preferably can be provided, can reduce floor space, shorten the construction period, simple in structure, construction costs is substantially constant.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is structural plan of the present invention arrangement diagram.
Fig. 2 is the 1-1 sectional drawing of Fig. 2.
Fig. 3 is the 2-2 sectional drawing of Fig. 3.
1. loop curve prestressing tendons in figure, 2. side wall, 3. middle ground tackle (claim again the ring anchor, anchor moves about), 4. in the middle of a stretching end of ground tackle, 5. the reservation stretch-draw groove of prestressing tendon, 6. another stretching end of middle ground tackle, 7. inside configuration space, 8. structural outer, 9. variable cross-section headers/footers, 10. dark beam, 11. sleeper.
The specific embodiment
at Fig. 1, 2, in 3, loop curve prestressing tendon (1) is a plane closed curve, formed by 6 prestress wires, lay loop curve prestressing tendon (1), the stretch-draw groove (5) of prestressing tendon is reserved in variable cross-section headers/footers (9) span centre inboard, when placing of concrete and after reaching prescribed strength, each section head and the tail of loop curve prestressing tendon (1) are linked in sequence by middle ground tackle (3) at stretch-draw groove place (5), then the arbitrary stretching end (4 or 6) at middle ground tackle carries out stretch-draw, configure by the designing requirement stiffener after stretch-draw is complete, shutoff stretch-draw groove (5) gets final product.
Claims (8)
1. the inner stretch-draw prestressing force concrete individual layer board of variable section box structure of a building, in parallel its section direction, board of variable section is set, form box section, board of variable section span-depth radio scope is at 7～36 meters, presstressed reinforcing steel is set in board of variable section, the stretch-draw groove is reserved in inside configuration stressed less, the plate side of easy construction, when placing of concrete and after reaching prescribed strength, each section head and the tail of same Prestress tendon are linked in sequence by middle ground tackle at stretch-draw groove place, then the arbitrary stretching end in the close inside configuration of middle ground tackle carries out stretch-draw, get final product by designing requirement shutoff stretch-draw groove after stretch-draw is complete, it is characterized in that: the stretch-draw groove is reserved in the side of inside configuration plate, the position of stressed less and easy construction, connect and tensioned prestressing bar by middle ground tackle.
2. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1, it is characterized in that: the structure cross section is the individual layer box-formed shape, the board of variable section span L is not less than 7 meters, and dark beam, sleeper form the dark framework of annular, and dark frame spacing is not more than L/3.
3. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1, it is characterized in that: in board of variable section, presstressed reinforcing steel is similar to traditional board of variable section arrangement of reinforcement, be positive and negative parabolic distribution, the inflection point position is 0.08L～0.12L, the presstressed reinforcing steel that is arranged in side wall and board of variable section forms a loop curve, the prestressing tendon profile is as far as possible consistent with bending moment diagram, as far as possible near the tension edge placement.
4. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1, it is characterized in that: the bundle shape of presstressed reinforcing steel can be closed curve, can be also non-closed curve; If closed curve, without anchored end; If be non-closed curve, its end is anchored end.
5. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1, it is characterized in that: every bundle presstressed reinforcing steel is comprised of 2～8 prestress wires, and the spacing of prestressing tendon is according to calculative determination.
6. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1 is characterized in that: the stretch-draw groove is reserved in the position of stressed less, easy construction, adopts strengthening measure to be arranged on the surface of board of variable section span centre; The spacing of same prestressing tendon preformed groove and middle ground tackle, need to arrange according to design, and its scope is 15～50 meters.
7. inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1 is characterized in that: if possess the stretch-draw anchor condition, the stretch-draw groove is reserved in inside configuration or outside component ends and side.
8. the job practices of inner stretch-draw prestressing force concrete individual layer board of variable section box structure according to claim 1, its step is:
A) lay prestressing tendon (1);
B) the stretch-draw groove (5) of prestressing tendon is reserved in headers/footers (9) side of stressed less, the easy construction of inside configuration, as adopting strengthening measure, can be arranged on the side of board of variable section span centre;
C), when placing of concrete and after reaching prescribed strength, at stretch-draw groove (5), locate by middle ground tackle (3), each section head and the tail of same Prestress tendon to be linked in sequence;
D) the arbitrary stretching end (4 or 6) at middle ground tackle carries out stretch-draw, and after stretch-draw is complete, by the configuration of designing requirement stiffener, shutoff stretch-draw groove (5) gets final product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100680345A CN102653953B (en) | 2012-03-15 | 2012-03-15 | Inner tensioning pre-stressed concrete single-layer variable section plate box-type structure |
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| CN2012100680345A CN102653953B (en) | 2012-03-15 | 2012-03-15 | Inner tensioning pre-stressed concrete single-layer variable section plate box-type structure |
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| CN102653953B true CN102653953B (en) | 2013-11-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105631190A (en) * | 2015-12-17 | 2016-06-01 | 中电投工程研究检测评定中心 | Reinforcement method of concrete deep beam |
| CN113090277A (en) * | 2021-04-01 | 2021-07-09 | 上海市城市建设设计研究总院（集团）有限公司 | Batch jacking discrete pipe row uninterrupted tensioning forming integral frame and construction method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059931A (en) * | 1976-01-29 | 1977-11-29 | Mongan William T | Building framing system for post-tensioned modular building structures |
| US4694621A (en) * | 1984-11-07 | 1987-09-22 | Locke Reginald A J | Modular building connecting means |
| CN2527608Y (en) * | 2002-05-17 | 2002-12-25 | 胡战波 | Prestressed large span solid web steel girder structure system |
| CN101067329A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN101067326A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN102261145A (en) * | 2011-04-22 | 2011-11-30 | 清华大学 | Integrally two-way and locally one-way steel-concrete slab composite floor system and construction method thereof |
| CN202466824U (en) * | 2012-03-15 | 2012-10-03 | 北京市轨道交通建设管理有限公司 | Box-shaped structure of internal tension prestressed concrete monolayer variable cross-section plate |
-
2012
- 2012-03-15 CN CN2012100680345A patent/CN102653953B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4059931A (en) * | 1976-01-29 | 1977-11-29 | Mongan William T | Building framing system for post-tensioned modular building structures |
| US4694621A (en) * | 1984-11-07 | 1987-09-22 | Locke Reginald A J | Modular building connecting means |
| CN2527608Y (en) * | 2002-05-17 | 2002-12-25 | 胡战波 | Prestressed large span solid web steel girder structure system |
| CN101067329A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN101067326A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN102261145A (en) * | 2011-04-22 | 2011-11-30 | 清华大学 | Integrally two-way and locally one-way steel-concrete slab composite floor system and construction method thereof |
| CN202466824U (en) * | 2012-03-15 | 2012-10-03 | 北京市轨道交通建设管理有限公司 | Box-shaped structure of internal tension prestressed concrete monolayer variable cross-section plate |
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Owner name: CHINESE INST. OF BUILDING SCIENCES CABR TECHNOLOGY Free format text: FORMER OWNER: CHINESE INST. OF BUILDING SCIENCES Effective date: 20130530 |
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Effective date of registration: 20130530 Address after: 100037, 2, a million village Avenue, Beijing, Xicheng District Applicant after: Beijing MTR Construction Administration Corporation Applicant after: China Academy of Building Research Applicant after: CABR Technology Co., Ltd. Address before: 100037, 2, a million village Avenue, Beijing, Xicheng District Applicant before: Beijing MTR Construction Administration Corporation Applicant before: China Academy of Building Research |
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Effective date of registration: 20150908 Address after: 100037, 2, a million village Avenue, Beijing, Xicheng District Patentee after: Beijing MTR Construction Administration Corporation Patentee after: China Academy of Building Research Patentee after: Jianyan Foundation Engineering LLC Patentee after: CABR Technology Co., Ltd. Address before: 100037, 2, a million village Avenue, Beijing, Xicheng District Patentee before: Beijing MTR Construction Administration Corporation Patentee before: China Academy of Building Research Patentee before: CABR Technology Co., Ltd. |