CN102535861A - Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip - Google Patents
Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip Download PDFInfo
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- CN102535861A CN102535861A CN2011104516542A CN201110451654A CN102535861A CN 102535861 A CN102535861 A CN 102535861A CN 2011104516542 A CN2011104516542 A CN 2011104516542A CN 201110451654 A CN201110451654 A CN 201110451654A CN 102535861 A CN102535861 A CN 102535861A
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Abstract
The invention relates to a tensioning method for bonded and unbonded combination prestress concrete beams at a post-cast strip, which is characterized by including the following steps of 1) setting one ends of bonded prestress stranded steel wires at haunching concrete positions on two sides of a frame beam below a floor slab, fixing one ends of unbonded prestress stranded steel wires on the upper side of the floor slab, and fixing the other ends of the bonded prestress stranded steel wires and the unbonded prestress stranded steel wires to a side post or a side beam of a building; 2) casting concrete and the haunching concrete to the frame beam and then casting the concrete of the floor slab; and 3) tensioning the unbonded prestress stranded steel wires on the floor slab firstly when the design strength of the frame beam and the floor slab reaches 75%, and then tensioning the bonded prestress stranded steel wire below the floor slab. By the tensioning method, construction period can be shortened, loss of prestress of prestress concrete members can be reduced and the respective advantages of the bonded prestress stranded steel wires and the unbonded prestress stranded steel wires can be developed.
Description
Technical field
The invention belongs to the tension technology field that there is bonding at the place, ater-casting and does not have bonding combined prestress concrete beam, be specifically related to a kind of method for stretching that there is bonding at the place, ater-casting and does not have bonding combined prestress concrete beam that is used for.
Background technology
The use of new material and new technology is that country widelys popularize in building trade; Building energy-saving (economize steel, economize cement) design is widelyd popularize; The prestressed structure form of large span is used in various building structure in a large number; Become the direction of modern designs research, construction technology research tracking, and progressively obtain promotion and application.But in practical project is used, employing be single have bonding or prestressing without bondn form of structure, though reached the certain designed effect, there is a following engineering difficult problem in single prestressed structure form:
1, the bonded prestress steel strand are because of the friction in bellows (friction between steel strand friction, steel strand and the tube wall each other, steel strand and the friction of bellows bleeding), and loss of prestress is bigger;
2, the bonded prestress effect is relatively good, but fluctuating stress loss in time is bigger;
Though it is 3, un-bonded prestressed steel strand has protective sleeve and loss of prestress is less, should technology higher to stretch-draw end ground tackle quality, performance demands;
4, un-bonded prestressed steel strand is because the sheath protection can be slided, and its intensity can not play one's part to the full in beam.
Summary of the invention
The objective of the invention is to be to provide place, a kind of ater-casting that the method for stretching that bonds and do not have bonding combined prestress concrete beam is arranged, this method duration can shorten, and can bring into play bonded prestress steel hinge line and prestressing without bondn steel hinge line advantage separately.
For realizing above-mentioned purpose, the technical scheme that the present invention taked is: there is bonding at the place, ater-casting and does not have the method for stretching of bonding combined prestress concrete beam, it is characterized in that it comprises the steps:
1) during the reinforcing bar binding of the Vierendeel girder 7 below the floor 6 of building; In the same Vierendeel girder 7 vertical, prestressing without bondn steel hinge line fixed support and bonded prestress steel hinge line fixed support are set with ater-casting 3; On prestressing without bondn steel hinge line fixed support, prestressing without bondn steel hinge line 1 is set, bonded prestress steel hinge line fixed support is provided with binding prestress steel hinge line 2;
One end of bonded prestress steel hinge line 2 is arranged at haunch concrete 10 places of floor 6 below Vierendeel girders 7 both sides; One end of prestressing without bondn steel hinge line 1 be fixed in floor 6 above, the other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 all is fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line 1 link to each other with the sealing off and covering anchorage end (ground tackle) 11 of prestressing without bondn steel hinge line on being arranged on floor 6 (being arranged on the top of floor 6); One end of bonded prestress steel hinge line 2 link to each other with the sealing off and covering anchorage end (ground tackle) 9 of the bonded prestress steel hinge line that is arranged on floor 6 belows (being arranged on haunch concrete 10 places);
2) concrete and the haunch concrete 10 of elder generation's cast Vierendeel girder 7; Pour into a mould the concrete of floor 6 again; The sealing off and covering anchorage end 11 of prestressing without bondn steel hinge line be positioned at floor 6 above, the sealing off and covering anchorage end 9 of bonded prestress steel hinge line is positioned on the haunch concrete 10 of floor 6 below Vierendeel girders 7 both sides;
3) when Vierendeel girder 7 and floor 6 reach its design strength 75% the time; Prestressing without bondn steel hinge line 1 on the pretensioning floor 6; Stop stretch-draw after meeting design requirement, an end of prestressing without bondn steel hinge line 1 is tight with prestressing without bondn steel hinge line 1 anchor at sealing off and covering anchorage end 11 places of prestressing without bondn steel hinge line; The bonded prestress steel hinge line 2 of stretch-draw floor 6 belows then; Stop stretch-draw after meeting design requirement, an end of bonded prestress steel hinge line 2 at sealing off and covering anchorage end 9 places of bonded prestress steel hinge line with ground tackle with bonded prestress steel hinge line 2 anchors tight (other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 all is fixed in ground tackle on the side column or side bar of building).
Described combined prestress concrete beam is to be provided with bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 in the same Vierendeel girder 7, is called the combined prestress concrete beam.
The invention belongs to the civil construction project field, the steel hinge line of bonded prestress to the effect that of research and prestressing without bondn steel hinge line are tied two-in-one combined prestress concrete beam construction technology, and first, prestressing technique at home and abroad is used widely.But be the single application structure form of bonded prestress steel hinge line and prestressing without bondn steel hinge line; With single prestressing force form relatively this combined prestress concrete beam technology have remarkable advantages, bonding is arranged and do not have the two-in-one combined prestress concrete beam of bonding and more can embody both advantages; The second, the method for installation of the layout of combined prestress concrete beam and stretch-draw is more flexible, greatly reduces construction difficulty and construction cost.
This innovative technology construction technology is novel; Solved following problem in the construction: 1. there is bonding at the place, ater-casting and does not have the two-in-one prestressed concrete beam of bonding and use; Fully complementation has bonding and prestressing without bondn advantage separately, and the minimizing beam is the degree of disturbing under the load action in use; Solved the big (40kN/m of preloading load
2) a designing requirement difficult problem; This method can reduce the loss of prestress of prestressed concrete, gives full play to bonding and un-bonded prestressed steel strand advantage separately.2. place, ater-casting bonded prestress steel hinge line stretch-draw end layout, installation, stretch-draw problem have been solved; 3. solved the problem of place, ater-casting prestressing without bondn steel hinge line layout, installation, stretch-draw; 4. combined prestress concrete beam construction speed and cost problem have been solved.
Because the structure overlength reaches optimum state in order to guarantee prestress wire in the stress of the whole frame construction of pulling anchor cable stage, whole prestressing force floor structure will utilize the ater-casting to separate stretch-draw.If the stretch-draw end in stride the ater-casting is at the bottom of plate, the constructor will arrive and operate quite difficulty in the scaffold, not only delays the duration, and it is long that circulation material also overstocks the time.Therefore the prestressing force pull end of ater-casting has been selected following processing mode: the prestressing force steel hinge line stretch-draw end that bonding is arranged is plate bottom application worker, and un-bonded prestressed steel strand is constructed onboard.It is original 1/3 to arrange the duration to shorten like this, for removing support body in advance assurance is provided.Upstairs the stretch-draw prestressing force steel hinge line can not only be ensured the quality of products, and need not set up job platform, more can guarantee safety.
The invention has the beneficial effects as follows: this method duration can shorten.The application that bonds and do not have the two-in-one combined prestress concrete beam of bonding is arranged; Can further reduce the loss of prestress of prestressed concrete; Further reduce the prestressed concrete beam degree of disturbing under the load action in use; Give full play to bonded prestress steel hinge line and prestressing without bondn steel hinge line advantage separately, compensation inferior position separately meets design requirement greatly.
Description of drawings
Fig. 1 is combined prestress concrete beam arrangement diagram of the present invention (among the figure main frame beam be the combined prestress concrete beam) in length and breadth;
Fig. 2 is stretch-draw end figure under place, the ater-casting combined prestress concrete beam plate; (post among the figure is the post under the floor plate);
Fig. 3 is that the place, ater-casting has bonding and do not have bonding combined prestress concrete beam floor map; (among the figure, 24 of bonded prestress steel hinge line 2 bundles, 4 of prestressing without bondn steel hinge line 2 bundles);
Fig. 4 is that the place, ater-casting has bonding and do not have bonding combined prestress concrete beam E-E generalized section (E-E analyses and observe among Fig. 3);
Fig. 5 is that the place, ater-casting has bonding and do not have bonding combined prestress concrete beam F-F generalized section (F-F analyses and observe among Fig. 3);
Among the figure: A, B, C, D district are that two floor plates are divided block by the ater-casting; 1-prestressing without bondn steel hinge line; 2-bonded prestress steel hinge line, 3-ater-casting, 5-interior card pull end, 6-floor (or claiming floor plate), 7-Vierendeel girder, 8-post, the sealing off and covering anchorage end of 9-bonded prestress steel hinge line, 10-haunch concrete, the sealing off and covering anchorage end of 11-prestressing without bondn steel hinge line.
The specific embodiment
Shown in Fig. 1-5, there is bonding at the place, ater-casting and does not have the method for stretching of bonding combined prestress concrete beam, and it comprises the steps:
1) during the reinforcing bar binding of the Vierendeel girder 7 below the floor 6 of building; In the same Vierendeel girder 7 vertical, prestressing without bondn steel hinge line fixed support and bonded prestress steel hinge line fixed support are set with ater-casting 3; On prestressing without bondn steel hinge line fixed support, prestressing without bondn steel hinge line 1 is set, bonded prestress steel hinge line fixed support is provided with binding prestress steel hinge line 2;
One end of bonded prestress steel hinge line 2 is arranged at haunch concrete 10 places of floor 6 below Vierendeel girders 7 both sides; One end of prestressing without bondn steel hinge line 1 be fixed in floor 6 above, the other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 all is fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line 1 link to each other with the sealing off and covering anchorage end (ground tackle) 11 of prestressing without bondn steel hinge line on being arranged on floor 6 (being arranged on the top of floor 6); One end of bonded prestress steel hinge line 2 link to each other with the sealing off and covering anchorage end (ground tackle) 9 of the bonded prestress steel hinge line that is arranged on floor 6 belows (being arranged on haunch concrete 10 places);
2) concrete and the haunch concrete 10 of elder generation's cast Vierendeel girder 7; Pour into a mould the concrete of floor 6 again; The sealing off and covering anchorage end 11 of prestressing without bondn steel hinge line be positioned at floor 6 above, the sealing off and covering anchorage end 9 of bonded prestress steel hinge line is positioned on the haunch concrete (back-up block) 10 of floor 6 below Vierendeel girders 7 both sides;
3) when Vierendeel girder 7 and floor 6 reach its design strength 75% the time; Prestressing without bondn steel hinge line 1 on the pretensioning floor 6; Stop stretch-draw after meeting design requirement, an end of prestressing without bondn steel hinge line 1 is tight with prestressing without bondn steel hinge line 1 anchor at sealing off and covering anchorage end 11 places of prestressing without bondn steel hinge line; The bonded prestress steel hinge line 2 of stretch-draw floor 6 belows then; Stop stretch-draw after meeting design requirement, an end of bonded prestress steel hinge line 2 at sealing off and covering anchorage end 9 places of bonded prestress steel hinge line with ground tackle with bonded prestress steel hinge line 2 anchors tight (other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 all is fixed in ground tackle on the side column or side bar of building).
Claims (1)
1. there is the method for stretching that bonds and do not have bonding combined prestress concrete beam at the place, ater-casting, it is characterized in that it comprises the steps:
1) when the reinforcing bar binding of the Vierendeel girder (7) of the floor (6) of building below; In the same Vierendeel girder (7) vertical, prestressing without bondn steel hinge line fixed support and bonded prestress steel hinge line fixed support are set with ater-casting (3); Prestressing without bondn steel hinge line (1) is set on prestressing without bondn steel hinge line fixed support, and bonded prestress steel hinge line fixed support is provided with binding prestress steel hinge line (2);
One end of bonded prestress steel hinge line (2) is arranged at the haunch concrete (10) of Vierendeel girder (7) both sides, floor (6) below and locates; One end of prestressing without bondn steel hinge line (1) be fixed in floor (6) above, the other end of bonded prestress steel hinge line (2) and prestressing without bondn steel hinge line (1) all is fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line (1) links to each other with the sealing off and covering anchorage end (11) of prestressing without bondn steel hinge line on being arranged on floor (6); One end of bonded prestress steel hinge line (2) links to each other with the sealing off and covering anchorage end (9) of the bonded prestress steel hinge line that is arranged on floor (6) below;
2) concrete and the haunch concrete (10) of elder generation's cast Vierendeel girder (7); Pour into a mould the concrete of floor (6) again; The sealing off and covering anchorage end (11) of prestressing without bondn steel hinge line be positioned at floor (6) above, the sealing off and covering anchorage end (9) of bonded prestress steel hinge line is positioned on the haunch concrete (10) of Vierendeel girder (7) both sides, floor (6) below;
3) when Vierendeel girder (7) and floor (6) reach its design strength 75% the time; Prestressing without bondn steel hinge line (1) on the pretensioning floor (6); Stop stretch-draw after meeting design requirement, an end of prestressing without bondn steel hinge line (1) is located prestressing without bondn steel hinge line (1) anchor tight at the sealing off and covering anchorage end (11) of prestressing without bondn steel hinge line; The bonded prestress steel hinge line (2) of stretch-draw floor (6) below then; Stop stretch-draw after meeting design requirement, an end of bonded prestress steel hinge line (2) is located with ground tackle bonded prestress steel hinge line (2) anchor is tight at the sealing off and covering anchorage end (9) of bonded prestress steel hinge line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110451654.2A CN102535861B (en) | 2011-12-29 | 2011-12-29 | Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110451654.2A CN102535861B (en) | 2011-12-29 | 2011-12-29 | Tensioning method for bonded and unbonded combination prestress concrete beams at post-cast strip |
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| CN102535861A true CN102535861A (en) | 2012-07-04 |
| CN102535861B CN102535861B (en) | 2014-09-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966953A (en) * | 2013-02-06 | 2014-08-06 | 永升建设集团有限公司 | Large-span concrete beam construction method based on unbonded steel strand prestress post-tensioning |
| CN106522561A (en) * | 2016-11-02 | 2017-03-22 | 中建八局第三建设有限公司 | Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method |
| CN109235261A (en) * | 2018-10-31 | 2019-01-18 | 广东省交通规划设计研究院股份有限公司 | Bridge tower builds device and bridge tower building method |
| CN112900882A (en) * | 2021-01-22 | 2021-06-04 | 中国建筑第八工程局有限公司 | Construction method of slow-bonding prestressed tendon penetrating through post-pouring area |
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| CN101775903A (en) * | 2010-01-22 | 2010-07-14 | 北京首钢建设集团有限公司 | Construction method for pouring after settlement of reinforced concrete continuous beam with cohesive pre-stress |
| CN201539095U (en) * | 2009-12-01 | 2010-08-04 | 江苏新筑预应力工程有限公司 | Unbonded prestressed concrete silo wall column stretching end joint sliding die system |
| CN101851985A (en) * | 2010-05-27 | 2010-10-06 | 卓清 | Articulated anchor and prestress tensioning method of high strength fibre composite sheet |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1544353A (en) * | 2003-11-17 | 2004-11-10 | 刘志刚 | Seamless rectangular water pool construction method of bounded or unbounded prestressed force |
| JP2007046313A (en) * | 2005-08-09 | 2007-02-22 | Shinko Wire Co Ltd | Method of directly embedding and connecting prestressing steels, and connection structure having binding force relaxing function |
| JP4326518B2 (en) * | 2005-10-24 | 2009-09-09 | 大成建設株式会社 | Pre-tension member |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966953A (en) * | 2013-02-06 | 2014-08-06 | 永升建设集团有限公司 | Large-span concrete beam construction method based on unbonded steel strand prestress post-tensioning |
| CN103966953B (en) * | 2013-02-06 | 2016-05-25 | 永升建设集团有限公司 | Based on the post-tensioned prestressed large-span concrete beam construction method of non-bending steel cable |
| CN106522561A (en) * | 2016-11-02 | 2017-03-22 | 中建八局第三建设有限公司 | Long-span concrete frame beam bonded prestressed post-cast strip inside stretching construction method |
| CN106522561B (en) * | 2016-11-02 | 2018-12-14 | 中建八局第三建设有限公司 | Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip |
| CN109235261A (en) * | 2018-10-31 | 2019-01-18 | 广东省交通规划设计研究院股份有限公司 | Bridge tower builds device and bridge tower building method |
| CN112900882A (en) * | 2021-01-22 | 2021-06-04 | 中国建筑第八工程局有限公司 | Construction method of slow-bonding prestressed tendon penetrating through post-pouring area |
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| CN102535861B (en) | 2014-09-17 |
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