CN202850200U - Inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure - Google Patents
Inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure Download PDFInfo
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- CN202850200U CN202850200U CN 201220098338 CN201220098338U CN202850200U CN 202850200 U CN202850200 U CN 202850200U CN 201220098338 CN201220098338 CN 201220098338 CN 201220098338 U CN201220098338 U CN 201220098338U CN 202850200 U CN202850200 U CN 202850200U
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Abstract
The utility model relates to an inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure of a building/structure, a framework structure is arranged parallel to the section direction of the box-shaped structure to form a box-shaped section, the cross section of a framework beam is I-shaped and the span-depth ratio of the framework beam is in the range of 7-36m, a prestressed rib is arranged in the framework to reserve a tensioning groove at the side surface of the web plate having an internal structure with less bearing and being convenient in construction of the framework beam, when the concrete is poured to reach the specified strength, the head and the tail of each section of the same prestressed strand are successively connected at the tensioning groove via a middle anchorage device, the prestressed strand is tensioned at the two sides of the web plate via the middle anchorage device, and the tensioning groove can be plugged accordingly after the tensioning is finished. The box-shaped structure is characterized in that the tensioning groove is reserved at the side surface of the web plate having an internal structure with less bearing and being convenient in construction of the framework beam, and the prestressed rib is connected and tensioned via the middle anchorage device in the I-shaped cross section of the framework beam. The single-layer I-shaped framework box-shaped structure can realize the tensioning and anchoring of the prestress when the end part of the single-layer I-shaped framework box-shaped structure cannot satisfy the condition of tensioning and anchoring, thus, the single-layer I-shaped framework box-shaped structure provided is particularly suitable for the single-layer I-shaped framework box-shaped structures of underground heavy duty concrete and long-span concrete. Therefore, the single-layer I-shaped framework box-shaped structure provided can provide better comfortableness and use performance, and can reduce the occupied area; moreover, the single-layer I-shaped framework box-shaped structure is simple in prestress tensioning technology, better in structural performance, less in construction difficulty, shorter in construction period, and stable in cost.
Description
Affiliated technical field
The utility model relates to a kind of post-tensioned prestressed concrete individual layer I type framework box structure of building, especially when not possessing tension of prestressed tendon, anchoring condition in frame ends, at the post-tensioned prestressed concrete individual layer I type framework box structure of the connection of the framework web side of inside configuration, tensioned prestressing bar.
Background technology
At present, known post-tensioned prestressed concrete individual layer I type framework box structure is sleeve pipe, distributing bar and the part of settling first post-tensioned prestressing muscle pore-forming, then installation form and concreting.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 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 the concrete, the space between presstressed reinforcing steel and the sleeve pipe must fill with real with cement paste.Cement paste also is conducive to recover the adhesion stress between presstressed reinforcing steel and the concrete except playing antisepsis.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 need to reserve the stretch-draw groove because of stretch-draw prestressing force, cause increasing construction costs, prolong the construction period, concerning some engineerings, it is unacceptable prolonging the construction period.The 11st page of " Guangdong building and building " o. 11th of publishing in November, 2002 disclosed one undergroundly stride greatly, 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 present Ying Shenyong in the construction of underground station.This design final choice ordinary concrete structural concept.Compare with prestressed structure, this ordinary concrete malformation is large, cracking resistance is relatively poor, endurance quality is bad, economy is general, limited stride greatly, the further application of heavy structure.
The utility model content
Require to reserve stretch-draw in its end in order to overcome existing post-tensioned prestressed concrete individual layer I type framework box structure, the deficiency of anchoring condition, the utility model provides a kind of inner stretch-draw prestressing force concrete individual layer I type framework box structure, this individual layer I type framework box structure no longer requires must reserve the stretch-draw anchor condition in its end, but can reserve the stretch-draw groove at the frame facet of inside configuration, in the stretch-draw groove, finish the connection of presstressed reinforcing steel by middle ground tackle, stretch-draw, this individual layer I type framework box-shaped construction pre-stress stretching technique is comparatively simple, structural performance is better, difficulty of construction is less, duration is relatively short, cost is substantially constant.
The technical solution of the utility model is:
A kind of inner stretch-draw prestressing force concrete individual layer I type framework box structure of building, in parallel its section direction frame construction is set, form box section, Vierendeel girder is I type cross section, Vierendeel girder span-depth radio scope is at 7～36 meters, presstressed reinforcing steel is set in framework, it is stressed less that the stretch-draw groove is reserved in inside configuration, the web side of easy construction Vierendeel girder, when placing of concrete and after reaching prescribed strength, be linked in sequence by each section head and the tail of middle ground tackle with same Prestress tendon at stretch-draw groove place, then carry out stretch-draw in the web both sides by middle ground tackle, after stretch-draw is complete on request shutoff stretch-draw groove get final product, it is characterized in that: it is stressed less that the stretch-draw groove is reserved in inside configuration, the web side of the Vierendeel girder of easy construction in Vierendeel girder I type cross section, connects and tensioned prestressing bar by middle ground tackle.
Feature of the present utility model also is: the structure cross section is the individual layer box-formed shape, and the Vierendeel girder span L is not less than 7 meters usually, and Vierendeel girder is I type cross section, and frame spacing is not more than L/3.
Feature of the present utility model also is: presstressed reinforcing steel is similar to traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder, 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 Vierendeel girder 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 utility model also is: the bundle shape of presstressed reinforcing steel can be closed curve, also can be non-closed curve; If closed curve, without anchored end; If be non-closed curve, its end is anchored end.
Feature of the present utility model also is: in same Pin prestressed frame, and the radical of every bundle presstressed reinforcing steel and prestressing tendon number, according to the setting of design needs, presstressed reinforcing steel is arranged about the vertical axis of symmetry of framework symmetrical.
Feature of the present utility model 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 setting of design needs, its scope is 15～50 meters.
Feature of the present utility model also is: if possess the stretch-draw space, carry out stretch-draw at middle ground tackle near inside configuration or an outside end.
Feature of the present utility model also is: if possess the stretch-draw anchor condition, the stretch-draw groove is reserved in the end of inside configuration member or the end of external member.
The beneficial effects of the utility model are, when individual layer I type framework 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 I type framework box structure greatly, preferably comfort level and functional performance can be provided, can reduce floor space, the prestressing force drawing process is comparatively simple, and structural performance is better, and difficulty of construction is less, duration is relatively short, and cost is substantially constant.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is structural plan of the present utility model arrangement diagram.
Fig. 2 is of the present utility model 1
#, 2
#Loop curve prestressing tendon section arrangement diagram.
Fig. 3 is of the present utility model 3
#, 4
#Loop curve 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 loop curve prestressing tendon, 6.2
#, 4
#The reservation stretch-draw groove of loop curve 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, an end of ground tackle direction structure inside in the middle of 11., 12. middle ground tackle (title encircles anchor again, anchor moves about), 13. frame columns.
The specific embodiment
In Fig. 1,2,4,1
#Loop curve prestressing tendon (1) is a plane closed curve, is made 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 a near side of the web of framework back timber/bottom girder (9) three branch natural axiss, when placing of concrete and after reaching prescribed strength, pass through middle ground tackle (12) with 1 at web side stretch-draw groove place (5)
#Each section head and the tail of loop curve prestressing tendon (1) are linked in sequence, and then the arbitrary stretching end (10,11) at middle ground tackle carries out stretch-draw, after stretch-draw is complete on request shutoff stretch-draw groove (5) get final product.2
#The embodiment of loop curve prestressing tendon (2) is 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 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 a near side of the web of framework back timber/bottom girder (9) three branch natural axiss, 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 then the arbitrary stretching end (10,11) at middle ground tackle carries out stretch-draw, after stretch-draw is complete on request shutoff stretch-draw groove (6) get final product 3
#Loop curve prestressing tendon (3) is a plane closed curve.4
#The embodiment of loop curve prestressing tendon (4) is with 3
#Loop curve prestressing tendon (3).
Claims (5)
1. inner stretch-draw prestressing force concrete individual layer I type framework box structure, in parallel its section direction frame construction is set, form box section, Vierendeel girder is I type cross section, Vierendeel girder span-depth radio scope is at 7～36 meters, presstressed reinforcing steel is set in framework, it is stressed less that the stretch-draw groove is reserved in inside configuration, the web side of easy construction Vierendeel girder, behind placing of concrete, be linked in sequence by each section head and the tail of middle ground tackle with same Prestress tendon at stretch-draw groove place, then carry out stretch-draw in the web both sides by middle ground tackle, the complete rear shutoff stretch-draw groove of stretch-draw gets final product, it is characterized in that: it is stressed less that the stretch-draw groove is reserved in inside configuration, the web side of the Vierendeel girder of easy construction in Vierendeel girder I type cross section, connects and tensioned prestressing bar by middle ground tackle.
2. inner stretch-draw prestressing force concrete individual layer I type framework box structure according to claim 1, it is characterized in that: the structure cross section is the individual layer box-formed shape, and the Vierendeel girder span L is not less than 7 meters, and Vierendeel girder is I type cross section, and frame spacing is not more than L/3.
3. inner stretch-draw prestressing force concrete individual layer I type framework box structure according to claim 1, it is characterized in that: presstressed reinforcing steel is similar to traditional prestressed frame beam arrangement of reinforcement in the Vierendeel girder, 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 Vierendeel girder forms a loop curve, the prestressing tendon profile is consistent with bending moment diagram, as far as possible near the tension edge placement.
4. inner stretch-draw prestressing force concrete individual layer I type framework box structure according to claim 1 is characterized in that: in same Pin prestressed frame, presstressed reinforcing steel is arranged about the vertical axis of symmetry of framework symmetrical.
5. inner stretch-draw prestressing force concrete individual layer I 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 is 15～50 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220098338 CN202850200U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220098338 CN202850200U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure |
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| CN202850200U true CN202850200U (en) | 2013-04-03 |
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| CN 201220098338 Expired - Fee Related CN202850200U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete single-layer I-shaped framework box-shaped structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653968A (en) * | 2012-03-15 | 2012-09-05 | 中国建筑科学研究院 | Inner tensioning pre-stressed concrete single-layer I-shaped framework box-type structure |
| CN105297612A (en) * | 2015-09-16 | 2016-02-03 | 浙江大学 | Method for improving integrality and durability of hollow slab frame bridge by adopting prestressing force |
-
2012
- 2012-03-15 CN CN 201220098338 patent/CN202850200U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653968A (en) * | 2012-03-15 | 2012-09-05 | 中国建筑科学研究院 | Inner tensioning pre-stressed concrete single-layer I-shaped framework box-type structure |
| CN105297612A (en) * | 2015-09-16 | 2016-02-03 | 浙江大学 | Method for improving integrality and durability of hollow slab frame bridge by adopting prestressing force |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20180315 |
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| CF01 | Termination of patent right due to non-payment of annual fee |