CN102653957A - Inner tensioning pre-stressed concrete double-layer T-shaped framework box-type structure - Google Patents
Inner tensioning pre-stressed concrete double-layer T-shaped framework box-type structure Download PDFInfo
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- CN102653957A CN102653957A CN201210068010XA CN201210068010A CN102653957A CN 102653957 A CN102653957 A CN 102653957A CN 201210068010X A CN201210068010X A CN 201210068010XA CN 201210068010 A CN201210068010 A CN 201210068010A CN 102653957 A CN102653957 A CN 102653957A
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- stretch
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- presstressed reinforcing
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Abstract
The invention relates to an inner tensioning pre-stressed concrete double-layer T-shaped framework box-type structure of a building. A framework is arranged in the section direction to form a double-layer box-type section, the sections of peripheral framework beams are T-shaped, the span range of the peripheral framework beams is 7 to 36 meters, annular prestressed ribs are arranged in the peripheral framework, parabolic prestressed ribs are arranged in framework beams on the middle layer, and tensioning grooves are reserved on the lateral surfaces of the framework in the structure; and when concrete reaches the specified strength, the segments of the same prestressed ribs 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 lateral surfaces of the framework 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 the structural member do not have tensioning and anchoring conditions, prestressed tensioning connection 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 double-layer framework box-type structure.
Description
Affiliated technical field
The present invention relates to a kind of double-deck T type of post-tensioned prestressed concrete framework box structure of building/structure; Especially when not possessing tension of prestressed tendon, anchoring condition, connect the also double-deck T type of the post-tensioned prestressed concrete framework box structure of tensioned prestressing bar in the concrete frame side of inside configuration in frame ends.
Background technology
At present, the double-deck T type of known post-tensioned prestressed concrete framework 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 beam, 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 the double-deck T type of existing post-tensioned prestressed concrete framework 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 double T type framework box structure; This bilayer T type framework box structure no longer requires must reserve the stretch-draw anchor condition at component ends; But can reserve the stretch-draw groove at the frame facet of inside configuration; Through connection, the stretch-draw of middle ground tackle completion presstressed reinforcing steel, this bilayer T type framework box-shaped construction pre-stress stretching technology is comparatively simple, difficulty of construction is less, the duration is shorter relatively in the stretch-draw groove, and cost is relatively low.
Technical scheme of the present invention is:
A kind of inner stretch-draw prestressing force concrete double T type framework box structure of building; In parallel its section direction frame construction is set; Form double-deck box section, Vierendeel girder span-depth radio scope is provided with annular prestressed muscle at 7～36 meters in frame column, back timber and bottom girder; At the framework central sill positive and negative parabola presstressed reinforcing steel is set; The stretch-draw groove is reserved in the frame facet 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 an end of inside configuration then; After stretch-draw finishes on request shutoff stretch-draw groove get final product, it is characterized in that: the stretch-draw groove is reserved in the side of structural inner frame, the position of stressed less and easy construction, connects and tensioned prestressing bar through middle ground tackle.
Characteristic of the present invention also is: the structure cross section is double-deck box-formed shape, and the Vierendeel girder span L is not less than 7 meters, and Vierendeel girder is T type cross section, and frame spacing is not more than L/3.
Characteristic of the present invention also is: presstressed reinforcing steel is similar with traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder; Be positive and negative parabolic distribution; The inflection point position is generally 0.08L～0.12L, and the presstressed reinforcing steel that is arranged on frame column, framework back timber and bottom girder forms a loop curve, and the framework central sill uses positive and negative parabola presstressed reinforcing steel; 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: in same Pin prestressed frame, and the radical of every bundle presstressed reinforcing steel and prestressing tendon number, according to the design demand setting, presstressed reinforcing steel is arranged about the vertical axis of symmetry symmetry of framework.
Characteristic of the present invention also is: the stretch-draw groove is reserved near the natural axis of Vierendeel girder three branches; 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 space, carry out stretch-draw at middle ground tackle near an inside configuration or an outside end.
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 frame ends and side.
The invention has the beneficial effects as follows; When double-deck T type framework box-shaped structural element end does not possess the stretch-draw anchor condition, can realize prestressed stretch-draw, anchoring, be specially adapted to underground heavy duty, stride concrete double T type framework box structure greatly; Comfort level and functional performance preferably can be provided; Can reduce floor space, shorten the construction period, and simple in structure, easy construction.Compare with the traditional double-deck T type of prestressing force framework box structure, construction costs can maintain an equal level or slightly reduce.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a top board structure layout plan of the present invention.
Fig. 2 is of the present invention 1
#, 2
#Prestressing tendon section arrangement diagram.
Fig. 3 is of the present invention 3
#, 4
#Prestressing tendon section arrangement diagram.
Fig. 4 is the 1-1 sectional drawing of Fig. 2.
Fig. 5 is the 1-1 sectional drawing of Fig. 3.
Among the figure 1.1
#The loop curve prestressing tendon, 2.2
#The loop curve prestressing tendon, 3.3
#The loop curve prestressing tendon, 4.4
#The loop curve prestressing tendon, 5.1
#, 3
#The reservation stretch-draw groove of prestressing tendon, 6.2
#, 4
#The reservation stretch-draw groove of prestressing tendon, 7. inside configuration space, 8. structural outer; 9. framework back timber/bottom girder, 10. in the middle of the ground tackle end that deviates from inside configuration, the inner end of ground tackle direction structures in the middle of 11.; 12. middle ground tackle (title encircles anchor again, anchor moves about), 13. frame columns, 14. positive and negative parabolas 1
#Prestressing tendon, 15. positive and negative parabolas 1
#The reservation stretch-draw groove of prestressing tendon, 16. framework central sills, the anchored end of 17. positive and negative parabola prestressing tendons, 18. positive and negative parabolas 2
#Prestressing tendon, 19. positive and negative parabolas 2
#The reservation stretch-draw groove of prestressing tendon.
The specific embodiment
In Fig. 1,2,4,1
#Loop curve prestressing tendon (1) is a plane closed curve, is made up of lay 18 prestress wires
#Loop curve prestressing tendon (1) is with 1
#The stretch-draw groove (5) of loop curve prestressing tendon (1) is reserved in the side of framework back timber/bottom girder (9) apart near the natural axis quartile of end, when placing of concrete and after reaching prescribed strength, passes through middle ground tackle (12) with 1 at stretch-draw groove place (5)
#Each section head and the tail of loop curve prestressing tendon (1) are linked in sequence, and carry out stretch-draw at middle ground tackle near the end (11) of inside configuration then, after stretch-draw finishes on request shutoff stretch-draw groove (5) get final product.2
#Loop curve prestressing tendon (2), positive and negative parabola 1
#The embodiment of prestressing tendon is basic with 1
#Loop curve prestressing tendon (1).
In Fig. 1,3,5,3
#Loop curve prestressing tendon (3) is a plane closed curve, is made up of lay 38 prestress wires
#Loop curve prestressing tendon (3) is with 3
#The stretch-draw groove (6) of loop curve prestressing tendon (3) is reserved in the side of framework back timber/bottom girder (9) apart near the natural axis quartile of end, 1
#, 3
#The stretch-draw groove (5) and 2 of loop curve prestressing tendon
#, 4
#The stretch-draw groove (6) of loop curve prestressing tendon is arranged about the vertical plane of symmetry antisymmetry of framework, when placing of concrete and after reaching prescribed strength, passes through middle ground tackle (12) with 3 at stretch-draw groove place (6)
#Each section head and the tail of loop curve prestressing tendon (3) are linked in sequence, and carry out stretch-draw at middle ground tackle near the end (11) of inside configuration then, after stretch-draw finishes on request shutoff stretch-draw groove (6) get final product 3
#Loop curve prestressing tendon (3) is a plane closed curve.4
#Loop curve prestressing tendon (4), positive and negative parabola 2
#The embodiment of prestressing tendon is basic with 2
#Loop curve prestressing tendon (2).
Claims (9)
1. the inner stretch-draw prestressing force concrete double T type framework box structure of a building; In parallel its section direction frame construction is set; Form double-deck box section, Vierendeel girder span-depth radio scope is provided with annular prestressed muscle at 7～36 meters in frame column, back timber and bottom girder; At the framework central sill positive and negative parabola presstressed reinforcing steel is set; The stretch-draw groove is reserved in the frame facet 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 an end of inside configuration then; After stretch-draw finishes on request shutoff stretch-draw groove get final product, it is characterized in that: the stretch-draw groove is reserved in the side of structural inner frame, the position of stressed less and easy construction, connects and tensioned prestressing bar through middle ground tackle.
2. inner stretch-draw prestressing force concrete double T type framework box structure according to claim 1, it is characterized in that: the structure cross section is double-deck box-formed shape, and the Vierendeel girder span L is not less than 7 meters, and Vierendeel girder is T type cross section, and frame spacing is not more than L/3.
3. inner stretch-draw prestressing force concrete double T type framework box structure according to claim 1; It is characterized in that: presstressed reinforcing steel is similar with traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder, is positive and negative parabolic distribution, and the inflection point position is generally 0.08L～0.12L; The presstressed reinforcing steel that is arranged on frame column, framework back timber and bottom girder forms a loop curve; The framework central sill uses positive and negative parabola presstressed reinforcing steel, 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.
4. inner stretch-draw prestressing force concrete double T type framework 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 double T type framework box structure according to claim 1; It is characterized in that: in same Pin prestressed frame; The radical of every bundle presstressed reinforcing steel and prestressing tendon number, according to the design demand setting, presstressed reinforcing steel is arranged about the vertical axis of symmetry symmetry of framework.
6. inner stretch-draw prestressing force concrete double T type framework box structure according to claim 1, it is characterized in that: the stretch-draw groove is reserved near the natural axis of Vierendeel girder three branches; 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 double T type framework box structure according to claim 1 is characterized in that: if possess the stretch-draw space, carry out stretch-draw at middle ground tackle near an inside configuration or an outside end.
8. inner stretch-draw prestressing force concrete double T type framework 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 frame ends and side.
9. the job practices of inner stretch-draw prestressing force concrete double T type framework box structure according to claim 1, its step is:
A) each prestressing tendon of lay (1,2,3,4,14,18);
B) the stretch-draw groove (5,6,15,19) of each prestressing tendon is reserved in the side of the stressed less and easy construction of structural inner frame back timber/bottom girder (9);
C), locate to be linked in sequence through each section head and the tail of middle ground tackle (12) with same presstressed reinforcing steel bundle at stretch-draw groove (5,6,15,19) when placing of concrete and after reaching prescribed strength;
D) carry out stretch-draw at middle ground tackle near the end (11) of inside configuration, after stretch-draw finishes on request shutoff stretch-draw groove (5,6,15,19) get final product;
E) when the multi beam presstressed reinforcing steel is set in concrete structure, each Shu Zhangla groove is usually about the structure section symmetric arrangement, all the other steps are same a), b), c), d).
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| CN 201210068010 CN102653957B (en) | 2012-03-15 | 2012-03-15 | Inner tensioning pre-stressed concrete double-layer T-shaped framework box-type structure |
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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 |
| CN202466823U (en) * | 2012-03-15 | 2012-10-03 | 中国建筑科学研究院 | Inner tensioning prestressed concrete double-layer T-shaped frame box structure |
-
2012
- 2012-03-15 CN CN 201210068010 patent/CN102653957B/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 |
| CN202466823U (en) * | 2012-03-15 | 2012-10-03 | 中国建筑科学研究院 | Inner tensioning prestressed concrete double-layer T-shaped frame box structure |
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