CN102051980A - Prestress structure with tendon simultaneously acting as inner and outer elements - Google Patents
Prestress structure with tendon simultaneously acting as inner and outer elements Download PDFInfo
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- CN102051980A CN102051980A CN200910211731XA CN200910211731A CN102051980A CN 102051980 A CN102051980 A CN 102051980A CN 200910211731X A CN200910211731X A CN 200910211731XA CN 200910211731 A CN200910211731 A CN 200910211731A CN 102051980 A CN102051980 A CN 102051980A
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Abstract
The invention relates to a novel prestress structure belonging to a civil and architectural engineering structure, which mainly comprises an inner part (1), an outer part (2), an anchor backing plate (3) and a steering block (4) of one prestress tendon, a cast-in-place concrete beam (5), the existing concrete beam (6), the existing concrete column (7), an anchor device (8) and the existing concrete floor (9), wherein one part of one prestress steel strand is arranged in the newly-cast reinforced concrete (5), and the other part is arranged outside the existing structures (6, 7 and 9); and the unbonded prestress tendon arranged in the newly-cast concrete beam extends from inside to outside, passes by the edge of the existing concrete column (7) and is anchored at the bottom of the existing beam (6). The advantages are as follows: by designing the newly-cast concrete beam (5) into a prestress structure, the beam depth is reduced, thus meeting use requirements; by using the prestress structure, the newly-cast concrete beam (5) reduces the quantity of non-prestress tendons, thus ensuring the tendon planting position and quality; preliminary pressure exists on the new/original concrete interface, thus improving the interface crack resistance; the unbonded prestress tendon internally arranged extends to the outside, or is anchored to the side of the column or is anchored to the bottom of the adjacent beam, thus meeting prestress design requirements of the newly-cast concrete and simultaneously reinforcing the adjacent existing concrete beams; and by using an intersection wiring mode, the invention overcomes the trend of the steel strand in the traditional parallel wiring mode to leave the beam body after stretching. The structure is applicable to multiple fields of civil and architectural engineering, such as column cutting for span expansion of buildings, corridor overhanging, balcony and story-adding reconstruction and the like.
Description
One, technical field
The inside and outside belongs to the civil construction project field with the rope prestressed reinforced concrete construction, is specially adapted in building strengthening and the improvement project joist and takes out post, long-span space and increase that layer is transformed and existing structure is encorbelmented strides corridor or balcony engineering greatly.
Two, background technology (body matter)
In building strengthening and improvement project, run into joist through regular meeting and take out post, long-span space and increase that layer is transformed and existing structure is encorbelmented strides corridor or balcony engineering greatly.
Take out the post engineering for joist, after post is taken out, beam span become original twice, the position of taking out post has become the span centre of beam, hogging moment area originally becomes the positive bending moment district.Simultaneously, after post was taken out, originally reinforcing bar existed and blocks in the position beam of post, concrete being disturbed in various degree again when taking out post, and moment of flexure maximum but cross section is the weakest, is easily gone wrong in the position of taking out post.In the common reinforcing, adopt the enlarged cross section method to solve the problem that this joist changes post, but it is excessive to run into deck-molding, influences the puzzlement of structure function of use.Owing to the increase of span, the beam-ends hogging moment area increases, and causes that the adjacent beams hogging moment also increases simultaneously, and in common reinforcing, this part internal force variation usually also can not get considering.
Increase a layer improvement project for long-span space, the newly-increased general span of beam is bigger, if use normal reinforced concrete beam, not only can be subjected to the too high puzzlement that influences function of use of deck-molding, also can run into and adopt normal reinforced concrete beam need arrange a lot of non-prestressing tendons, can on original post, bore a lot of holes, weaken the supporting capacity of post, and the problem of the position of bar planting and difficult quality guarantee.And newly-increased beam is to rely on new-to-old concrete interface to be connected with existing structure, and is easy to crack in the process of using, and both be to be designed to prestressed concrete beam with newly watering beam, but it is too concentrated also can to run into the presstressed reinforcing steel anchorage point, the problem of anchoring difficulty.In addition, when newly-increased beam span was big, the beam-ends of newly-increased beam can produce bigger hogging moment, and the existence of this hogging moment will cause redistribution of internal force at beam-ends, and the adjacent beams hogging moment is increased, and this part internal force changes and usually also can not get considering.
Encorbelment corridor or balcony engineering of existing structure adopts the bar planting technology usually, cast-in-situ concrete outrigger and floor then, above-mentioned way is suitable when the corridor of encorbelmenting or balcony span are little, if but corridor of encorbelmenting or balcony span be when big, the destruction that outrigger root cracking or crab-bolt bond-anchorage deficiency easily take place.Simultaneously, span increases the quantity of reinforcement that causes beam body plain bars and increases, and causes the quantity of bar planting to increase the position of reinforcing bar bar planting and difficult quality guarantee.In addition, when the beam span of encorbelmenting is big, cause that existing structure beam-ends hogging moment increases, this part load can not get considering usually in stabilization works, and the safety stock of structure is descended
Three, summary of the invention (body matter)
The present invention proposes a kind of prestressed structure, make full use of the prestressed reinforcement technology, solved the existing structure joist and taken out a difficult problem that is run in post, long-span space increase that layer is transformed and existing structure is encorbelmented corridor or the balcony engineering.
The present invention overcomes the difficult problem that above-mentioned engineering runs into and realizes by following measure: the inside and outside is with the rope prestressed reinforced concrete construction, the composition of its structure mainly by part (1) and outer body (2), anchor plate (3), steering block (4) in the body of same prestressing tendon, newly water reinforced concrete beam (5), existing reinforced concrete beam (6), existing reinforced concrete post (7), ground tackle (8) and existing reinforced concrete floor (9) and form.Its principal character one is that a same un-bonded prestressed steel strand part is arranged in the body that newly waters reinforced concrete beam (5), becomes part (1) in the body; Another part is arranged in the external of existing reinforced concrete structure (6) (7) (9), becomes outer body (2).These extend external unbonded prestressing tendon in body, walk around existing reinforced concrete post (7) limit, and a part is anchored in the post side, and another part is anchored at the bottom of existing reinforced concrete beam (6) beam.The basic goal of doing like this is to have solved unbonded prestressing tendon when the post side anchor is too concentrated admittedly, has considered that strengthening reconstruction causes the adverse effect of the change of structural system to the existing structure adjacent beams, reinforces the existing structure adjacent beams.The 2nd, be designed to the prestressing without bondn structure with newly watering reinforced concrete beam (5), prestressing tendon is arranged in the beam body.Newly water reinforced concrete beam owing to adopt prestressed structure, it is lower that deck-molding can be done, and the quantity of non-prestressing tendon can reduce greatly, satisfied the owner and headroom is used gone up when requiring, and reduced the quantity of bar planting, guaranteed the quality of bar planting.Have prestressing force owing to newly water in the reinforced concrete beam (5), the crack resistance of therefore newly watering reinforced concrete beam (5) and existing reinforced concrete post (7) New-old concrete joint surface also is improved.The 3rd, be arranged in the unbonded prestressing tendon that newly waters in the reinforced concrete beam body and adopt curve cloth muscle, arrange that the unbonded prestressing tendon of existing structure outer body adopts broken line cloth muscle.The 4th, it is external no matter these unbonded prestressing tendons are arranged in vivo or be arranged in, and all adopts the cross wire mode.After adopting such wire laying mode to overcome the stretch-draw of traditional parallel wiring mode, steel strand have the trend of leaving the beam body.
Major advantage of the present invention: owing to adopt prestressing technique, it is lower that the deck-molding of newly-increased beam (5) can be done, satisfy the structure function instructions for use, can also reduce the quantity of plain bars greatly, solved the difficulty of bar planting position and difficult quality guarantee on existing structure; Simultaneously, newly water reinforced concrete beam (5) and existing reinforced concrete post (7) New-old concrete joint surface, improved the crack resistance at bond between fresh and hardened concretes interface owing to there is precompression.In addition, this prestressing technique arranges that with part unbonded prestressing tendon in vivo extends external, the curved existing reinforced concrete beam bottom that is anchored in has solved the problem that prestressing tendon is concentrated admittedly at the post side anchor, and the adjacent beams hogging moment area has been played reinforcement effect under adjacent beams l/3 place.At last, adopt the wire laying mode of cross wire, overcome traditional parallel wiring mode steel strand tension after, the trend of leaving the beam body is arranged.
Description of drawings (body matter)
Fig. 1 utilizes the inside and outside to carry out large span outrigger design elevation with the rope prestressed structure
Fig. 2 utilizes the inside and outside to carry out large span outrigger design vertical view with the rope prestressed structure
The specific embodiment
Example 1
The square, Nanjing is according to owner's function instructions for use, need three layers to six layers along
Axle suspension is chosen the outrigger construction corridor that 4.5m strides.Through the ratio choosing of multiple scheme, final definite employing inside and outside solves the 4.5m outrigger of encorbelmenting with the rope prestressing technique and builds the corridor problem on existing building.
At first, the 4.5m outrigger is designed to newly water unbonded prestressed concrete structure (5), adopts the mode of cross wire to be arranged in (1) in the concrete bodies unbonded prestressing tendon; Secondly, at outrigger root and existing concrete column (7) interface place the body internal beam is extended externally, walk around the post limit, it is external to be arranged in existing reinforced concrete beam (6), becomes outer body (2).When steel strand extended to the l/3 place of steel concrete beam span, curved down by steering block, employing anchor plate (3) and ground tackle (8) were anchored in unbonded prestressing tendon at the bottom of existing concrete beam (6) beam.Prestressing force layout of this project and wire laying mode and design calculation process thereof can be referring to " inside and outside is striden the outrigger design greatly with the rope prestressing technique " literary compositions that is published on 2009 the 1st phases " unique construction ".
Claims (4)
1. the inside and outside is with the rope prestressed reinforced concrete construction, the composition of its structure mainly contains the interior part of body (1) and the outer body (2) of same prestressing tendon, anchor plate (3), steering block (4), newly placed concrete beam (5), existing reinforced concrete beam (6), existing reinforced concrete post (7), ground tackle (8) and existing concrete floor (9), its principal character is that a same prestress wire part is arranged in the body of newly placed concrete beam (5), and another part is arranged in existing reinforced concrete beam (6), existing reinforced concrete post (7) and existing concrete floor (9) external.
2. according to the requirement of right 1, no matter be prestressing with bond muscle or external prestressing muscle, all adopt un-bonded prestressed steel strand.
3. according to the requirement of right 1, un-bonded prestressed steel strand no matter be arranged in newly placed concrete (5) body, still to be arranged in existing structure external, all adopts the mode of a cross wire.
4. according to the requirement of right 1, arrange that unbonded prestressing tendon (1) extension in vivo is arranged in external (2), walks around the post limit, or be anchored in the post side, or when extending to existing reinforced concrete beam l/3 place,, be anchored in existing reinforced concrete beam (6) bottom by steering block curved back (4) down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910211731XA CN102051980A (en) | 2009-11-06 | 2009-11-06 | Prestress structure with tendon simultaneously acting as inner and outer elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910211731XA CN102051980A (en) | 2009-11-06 | 2009-11-06 | Prestress structure with tendon simultaneously acting as inner and outer elements |
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| Publication Number | Publication Date |
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| CN102051980A true CN102051980A (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910211731XA Pending CN102051980A (en) | 2009-11-06 | 2009-11-06 | Prestress structure with tendon simultaneously acting as inner and outer elements |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913028A (en) * | 2012-02-01 | 2013-02-06 | 于天庆 | Concrete telegraph pole and other prefabricated concrete components capable of being easily carried and locally assembled with prestressing force |
| CN103388408A (en) * | 2013-07-28 | 2013-11-13 | 桂林理工大学 | External pre-stressed tendon reinforcing steering block for building structure |
| CN104032957A (en) * | 2014-07-03 | 2014-09-10 | 江苏南通六建建设集团有限公司 | Out-body inner-tube prestressing force hauling multilayer cantilever beam plate structure and construction method |
| CN104453271A (en) * | 2015-01-08 | 2015-03-25 | 兰州理工大学 | Method for reinforcing bent crack of cantilever plate structure |
| CN110172951A (en) * | 2019-06-26 | 2019-08-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of Reinforced Concrete In Harbor Engineering beam body External prestressed bracing means and reinforcement means |
| CN110805261A (en) * | 2019-11-09 | 2020-02-18 | 上海建工集团股份有限公司 | Steel platform steel beam structure based on prestress reinforcement and construction method |
-
2009
- 2009-11-06 CN CN200910211731XA patent/CN102051980A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913028A (en) * | 2012-02-01 | 2013-02-06 | 于天庆 | Concrete telegraph pole and other prefabricated concrete components capable of being easily carried and locally assembled with prestressing force |
| CN102913028B (en) * | 2012-02-01 | 2016-01-27 | 于天庆 | A kind of concrete electric pole and other prefabricated concrete elements gently can taking prestressing force assembling on the spot |
| CN103388408A (en) * | 2013-07-28 | 2013-11-13 | 桂林理工大学 | External pre-stressed tendon reinforcing steering block for building structure |
| CN103388408B (en) * | 2013-07-28 | 2016-01-13 | 桂林理工大学 | A kind of building structure external prestressing muscle reinforces steering block |
| CN104032957A (en) * | 2014-07-03 | 2014-09-10 | 江苏南通六建建设集团有限公司 | Out-body inner-tube prestressing force hauling multilayer cantilever beam plate structure and construction method |
| CN104453271A (en) * | 2015-01-08 | 2015-03-25 | 兰州理工大学 | Method for reinforcing bent crack of cantilever plate structure |
| CN104453271B (en) * | 2015-01-08 | 2016-08-24 | 兰州理工大学 | The reinforcement means in cantilevered plate structural bending type crack |
| CN110172951A (en) * | 2019-06-26 | 2019-08-27 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of Reinforced Concrete In Harbor Engineering beam body External prestressed bracing means and reinforcement means |
| CN110805261A (en) * | 2019-11-09 | 2020-02-18 | 上海建工集团股份有限公司 | Steel platform steel beam structure based on prestress reinforcement and construction method |
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Addressee: Li Yanhe Document name: Notification of before Expiration of Request of Examination as to Substance |
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Application publication date: 20110511 |