CN202644716U - Inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure - Google Patents
Inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure Download PDFInfo
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- CN202644716U CN202644716U CN 201220098269 CN201220098269U CN202644716U CN 202644716 U CN202644716 U CN 202644716U CN 201220098269 CN201220098269 CN 201220098269 CN 201220098269 U CN201220098269 U CN 201220098269U CN 202644716 U CN202644716 U CN 202644716U
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Abstract
The utility model relates to an inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure. A variable-cross-section panel is arranged in a direction parallel to the cross section, a double-layer box-shaped cross section is formed, the span range of the variable-cross-section panel is 7 to 36m, after annular prestressed ribs are arranged in a peripheral component, a parabola prestressed rib is arranged in the middle layer flat plate, tensioning grooves are preserved at the side surface of a component arranged inside the structure, after the concrete installation, all sections of one prestressed rib are sequentially connected in an end-to-end way and are tensioned at the tensioning groove parts through a middle anchor, and then, the tensioning grooves are sealed and blocked. The inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure is characterized in that the tensioning grooves are preserved at the side surface of the component inside the structure, and the prestressed ribs are connected and tensioned through the middle anchor. The inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure has the beneficial effects that when the end part of the structural component does not have the tensioning and anchoring conditions, the prestressed tensioning connection can be realized, good comfort degree, use performance and structural performance can be provided, and the inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure is particularly applicable to underground heavy load and large-span double-layer box-shaped structures.
Description
Affiliated technical field
The utility model relates to a kind of double-deck board of variable section box structure of post-tensioned prestressed concrete of building, especially when not possessing tension of prestressed tendon, anchoring condition at component ends, connect the also double-deck board of variable section box structure of post-tensioned prestressed concrete of tensioned prestressing bar in the concrete component side of inside configuration.
Background technology
At present, the double-deck board of variable section box structure of known post-tensioned prestressed concrete 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 member, 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 the deficiency of stretch-draw anchor condition in its end in order to overcome the double-deck board of variable section box structure of existing post-tensioned prestressed concrete, the utility model provides a kind of inner stretch-draw prestressing force concrete double board of variable section box structure, this bilayer board of variable section box structure no longer requires must reserve the stretch-draw anchor condition at component ends, but can reserve the stretch-draw groove in the member side of inside configuration, in the stretch-draw groove, finish the connection of presstressed reinforcing steel by middle ground tackle, stretch-draw, this bilayer board of variable section box structure prestressing force drawing process is comparatively simple, duration is relatively short, and cost is substantially constant.
The technical solution of the utility model is:
A kind of inner stretch-draw prestressing force concrete double board of variable section box structure of building, in parallel its section direction board of variable section is set, form double-deck box section, board of variable section is striden the thickness rate scope at 7～36 meters, at side wall, annular prestressed muscle is set in top board and the base plate, plate arranges positive and negative parabola presstressed reinforcing steel in framework, it is stressed less that the stretch-draw groove is reserved in inside configuration, the member side of easy construction, 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 the arbitrary stretching end at middle ground tackle carries out stretch-draw, on request stiffener configuration after stretch-draw is complete, shutoff stretch-draw groove gets final product, it is characterized in that: it is stressed less that the stretch-draw groove is reserved in inside configuration, the member side of easy construction connects and tensioned prestressing bar by middle ground tackle.
Feature of the present utility model also is: the structure cross section is double-deck box-formed shape, and the board of variable section span L is not less than 7 meters, and dark beam, sleeper form the closed dark framework of annular, and dark frame spacing is not more than L/3.
Feature of the present utility model also is: presstressed reinforcing steel is similar to traditional prestressing force board of variable section arrangement of reinforcement in the board of variable section, be positive and negative parabolic distribution, the inflection point position is generally 0.08L～0.12L, the presstressed reinforcing steel that is arranged on side wall, top board and base plate forms a loop curve, middle plate uses positive and negative parabola presstressed reinforcing steel, 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: 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 utility model also is: the stretch-draw groove is reserved in the position of stressed less, easy construction, adopts strengthening measure to be arranged on the side of board of variable section span centre; 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 anchor condition, the stretch-draw groove is reserved in inside configuration or outside component ends and side.
The beneficial effects of the utility model are, when double-deck board of variable section box structure component ends does not possess the stretch-draw anchor condition, can realize prestressed stretch-draw, anchoring, be specially adapted to underground heavy duty, stride concrete double board of variable section box structure greatly, preferably comfort level and functional performance can be provided, can reduce floor space, shorten the construction period, simple in structure, construction costs 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 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. middle ground tackle (title encircles anchor again, anchor moves about), 4. middle ground tackle stretching end, 5. the reservation stretch-draw groove of loop curve prestressing tendon, 6. in the middle of another stretching end of ground tackle, 7. inside configuration space, 8. structural outer, 9. variable cross-section headers/footers, 10. dark beam, 11. sleeper, 12. positive and negative parabola prestressing tendon, plate in 13..
The specific embodiment
At Fig. 1,2, in 3, loop curve prestressing tendon (1) is a plane closed curve, formed by 8 prestress wires, lay loop curve prestressing tendon (1), the stretch-draw groove (5) of loop curve prestressing tendon (1) 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 by each section head and the tail of middle ground tackle (3) with loop curve prestressing tendon (1) at stretch-draw groove place (5), then the arbitrary stretching end (4 or 6) at middle ground tackle carries out stretch-draw, after stretch-draw is complete on request shutoff stretch-draw groove (5) get final product.The embodiment of positive and negative parabola prestressing tendon (12) is substantially with loop curve prestressing tendon (1).
Claims (6)
1. the inner stretch-draw prestressing force concrete double board of variable section box structure of a building, in parallel its section direction board of variable section is set, form double-deck box section, board of variable section is striden the thickness rate scope at 7～36 meters, at side wall, annular prestressed muscle is set in top board and the base plate, plate arranges positive and negative parabola presstressed reinforcing steel in framework, the stretch-draw groove is reserved in the stressed less member side of inside configuration, 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 the arbitrary stretching end at middle ground tackle carries out stretch-draw, the complete rear stiffener configuration of stretch-draw, shutoff stretch-draw groove gets final product, and it is characterized in that: it is stressed less that the stretch-draw groove is reserved in inside configuration, the member side of easy construction connects and tensioned prestressing bar by middle ground tackle.
2. inner stretch-draw prestressing force concrete double board of variable section box structure according to claim 1, it is characterized in that: the structure cross section is double-deck box-formed shape, the board of variable section span L is not less than 7 meters, and dark beam, sleeper form the closed dark framework of annular, and dark frame spacing is not more than L/3.
3. inner stretch-draw prestressing force concrete double board of variable section box structure according to claim 1, it is characterized in that: presstressed reinforcing steel is positive and negative parabolic distribution in the board of variable section, the inflection point position is generally 0.08L～0.12L, the presstressed reinforcing steel that is arranged on side wall, top board and base plate forms a loop curve, middle plate uses positive and negative parabola presstressed reinforcing steel, the prestressing tendon profile is consistent with bending moment diagram, near the tension edge placement.
4. inner stretch-draw prestressing force concrete double 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, also can be 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 double 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.
6. inner stretch-draw prestressing force concrete double board of variable section box structure according to claim 1, it is characterized in that: the stretch-draw groove is reserved in stressed less position, adopts strengthening measure to be arranged on the side of board of variable section span centre; The spacing range 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 201220098269 CN202644716U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220098269 CN202644716U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202644716U true CN202644716U (en) | 2013-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220098269 Withdrawn - After Issue CN202644716U (en) | 2012-03-15 | 2012-03-15 | Inner tensioning prestressed concrete double-layer variable-cross-section panel box-shaped structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202644716U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653954A (en) * | 2012-03-15 | 2012-09-05 | 北京市轨道交通建设管理有限公司 | Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure |
| CN108571002A (en) * | 2018-04-13 | 2018-09-25 | 中交第三航务工程局有限公司 | A kind of ring orientation prestress concrete boxed cofferdam and making and installation method for cushion cap foundation construction |
-
2012
- 2012-03-15 CN CN 201220098269 patent/CN202644716U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102653954A (en) * | 2012-03-15 | 2012-09-05 | 北京市轨道交通建设管理有限公司 | Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure |
| CN102653954B (en) * | 2012-03-15 | 2013-09-11 | 北京市轨道交通建设管理有限公司 | Inner tensioning pre-stressed concrete double-layer variable section plate box-type structure |
| CN108571002A (en) * | 2018-04-13 | 2018-09-25 | 中交第三航务工程局有限公司 | A kind of ring orientation prestress concrete boxed cofferdam and making and installation method for cushion cap foundation construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130102 Effective date of abandoning: 20131009 |
|
| RGAV | Abandon patent right to avoid regrant |