CN102653953A - 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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- CN102653953A CN102653953A CN2012100680345A CN201210068034A CN102653953A CN 102653953 A CN102653953 A CN 102653953A CN 2012100680345 A CN2012100680345 A CN 2012100680345A CN 201210068034 A CN201210068034 A CN 201210068034A CN 102653953 A CN102653953 A CN 102653953A
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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 not possessing tension of prestressed tendon, anchoring condition, connect the also post-tensioned prestressed concrete individual layer board of variable section box structure of tensioned prestressing bar in the concrete slab side of inside configuration in the plate end.
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 settling post-tensioned prestressing muscle pore-forming earlier, mounting template and concreting then.Presstressed reinforcing steel can also can be worn later on by first threading.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 through the two ends ground tackle.In order to protect presstressed reinforcing steel not corroded and to recover the adhesion stress between presstressed reinforcing steel and the concrete, the space between presstressed reinforcing steel and the sleeve pipe must irritate real with cement paste.Cement paste also helps recovering the adhesion stress between presstressed reinforcing steel and the concrete except that playing antisepsis.Construction for ease, the no bonded post tensioning prestressing force that also can be employed in presstressed reinforcing steel external coating anti-corrosion material sometimes and wrap up with plastic bushing or oilpaper.But, at the two ends of underground structure member, need reserve the stretch-draw groove because of stretch-draw prestressing force usually, cause increasing construction costs, prolong the construction period, concerning some engineerings, it is unacceptable prolonging the construction period.Disclosed on the 11st page of " Guangdong building and building " o. 11th of publishing in November, 2,002 one undergroundly stride greatly, heavy structure; This article compares prestressing force and two kinds of schemes of ordinary concrete structure; 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 bigger, therefore Ying Shenyong in the construction of underground station at present.The ordinary concrete structural concept has finally been selected in this design for use.Compare with prestressed structure, this ordinary concrete malformation is big, cracking resistance is relatively poor, endurance quality is bad, economy is general, limited stride greatly, the further application of heavy structure.
Summary of the invention
In order to overcome existing post-tensioned prestressed concrete individual layer board of variable section box structure requires to reserve the stretch-draw anchor condition in its end deficiency; The present 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; Through connection, the stretch-draw of middle ground tackle completion presstressed reinforcing steel, this individual layer board of variable section box structure prestressing force drawing process is comparatively simple, the duration is shorter relatively in the stretch-draw groove, and cost is constant basically.
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, forms 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 the plate side of stressed less, the easy construction of inside configuration,, is linked in sequence through each section head and the tail of middle ground tackle same presstressed reinforcing steel bundle at stretch-draw groove place when placing of concrete and after reaching prescribed strength; Carry out stretch-draw at middle ground tackle near arbitrary stretch-draw end of inside configuration then; The stretch-draw back that finishes get final product by designing requirement shutoff stretch-draw groove, and 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, connects also tensioned prestressing bar through middle ground tackle.
Characteristic 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.
Characteristic of the present invention also is: presstressed reinforcing steel is similar with traditional board of variable section arrangement of reinforcement in the board of variable section; 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 the board of variable section forms a loop curve, and the prestressing tendon profile is consistent with bending moment diagram as far as possible, arranges near the tight side edge as far as possible.
Characteristic of the present invention also is: the bundle shape of presstressed reinforcing steel can be a closed curve, also can be non-closed curve; If closed curve, no anchored end; If be non-closed curve, its end is an anchored end.
Characteristic of the present invention also is: every bundle presstressed reinforcing steel is made up of 2～8 prestress wires, and the spacing of prestressing tendon is confirmed according to calculating.
Characteristic 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, according to the design demand setting, its scope is 15～50 meters.
Characteristic 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, stride concrete individual layer board of variable section box structure greatly; Comfort level and functional performance preferably can be provided, can reduce floor space, shorten the construction period; Simple in structure, construction costs is constant basically.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a 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 among the figure, 2. side wall, 3. centre ground tackle (title encircles anchor again, anchor moves about); 4. middle ground tackle stretch-draw end, the 5. reservation stretch-draw groove of prestressing tendon, 6. in the middle of another stretch-draw end of ground tackle; 7. inside configuration space, 8. structural outer, 9. variable cross-section headers/footers; 10. dark beam, 11. sleeper.
The specific embodiment
In Fig. 1,2,3; Loop curve prestressing tendon (1) is a plane closed curve, is made up of lay loop curve prestressing tendon (1) 6 prestress wires; 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, be linked in sequence through each section head and the tail of middle ground tackle (3) at stretch-draw groove place (5) loop curve prestressing tendon (1), the arbitrary stretch-draw end (4 or 6) at middle ground tackle carries out stretch-draw then; Stretch-draw finishes the back by the configuration of designing requirement stiffener, and 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, forms 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 the plate side of stressed less, the easy construction of inside configuration,, is linked in sequence through each section head and the tail of middle ground tackle same presstressed reinforcing steel bundle at stretch-draw groove place when placing of concrete and after reaching prescribed strength; Carry out stretch-draw at middle ground tackle near arbitrary stretch-draw end of inside configuration then; The stretch-draw back that finishes get final product by designing requirement shutoff stretch-draw groove, and 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, connects also tensioned prestressing bar through 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: presstressed reinforcing steel is similar with traditional board of variable section arrangement of reinforcement in the board of variable section; Be positive and negative parabolic distribution, the inflection point position is 0.08L～0.12L, and the presstressed reinforcing steel that is arranged in side wall and the board of variable section forms a loop curve; The prestressing tendon profile is consistent with bending moment diagram as far as possible, arranges near the tight side edge as far as possible.
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 a closed curve, also can be non-closed curve; If closed curve, no anchored end; If be non-closed curve, its end is an 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 made up of 2～8 prestress wires, and the spacing of prestressing tendon is confirmed according to calculating.
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, according to the design demand setting, 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, can be arranged on the side of board of variable section span centre as adopting strengthening measure;
C), locate to be linked in sequence through each section head and the tail of middle ground tackle (3) with same presstressed reinforcing steel bundle at stretch-draw groove (5) when placing of concrete and after reaching prescribed strength;
D) the arbitrary stretch-draw end (4 or 6) at middle ground tackle carries out stretch-draw, and stretch-draw finishes the back by the configuration of designing requirement stiffener, and 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 CN102653953B (en) | 2013-11-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| CN101067326A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN101067329A (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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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 |
| CN101067326A (en) * | 2006-05-01 | 2007-11-07 | 邱则有 | Sandwich member for concrete use |
| CN101067329A (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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN102653953B (en) | 2013-11-20 |
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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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Owner name: CHINESE INST. OF BUILDING SCIENCES JIANYAN FOUNDAT Free format text: FORMER OWNER: CHINESE INST. OF BUILDING SCIENCES CABR TECHNOLOGY CO., LTD. Effective date: 20150908 |
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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. |