CN102535861B - 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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- CN102535861B CN102535861B CN201110451654.2A CN201110451654A CN102535861B CN 102535861 B CN102535861 B CN 102535861B CN 201110451654 A CN201110451654 A CN 201110451654A CN 102535861 B CN102535861 B CN 102535861B
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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 ater-casting place has bonding and the tension technology field without bonding combined prestress concrete beam, and being specifically related to a kind ofly has bonding and the method for stretching without bonding combined prestress concrete beam for ater-casting place.
Background technology
The use of new material and new technology is that country widelys popularize in building trade, energy-conservation (economize steel, economize cement) design of building is widelyd popularize, the prestressed structure form of large span is used in a large number in various building structure, become the direction of modern designs research, construction technology Follow-up study, and be progressively promoted and apply.But in actual engineering is used, employing be single have bonding or prestressing without bondn form of structure, although reached certain design effect, there is a following engineering difficult problem in single prestressed structure form:
1, bonded prestress steel strand are because of the friction in bellows (friction, steel strand and the friction of bellows bleeding between steel strand friction, steel strand and tube wall each other), and loss of prestress is larger;
2, bonded prestress effect is relatively good, but temporal evolution stress loss is larger;
Although 3, un-bonded prestressed steel strand has protective sleeve and loss of prestress is less, this technology is had relatively high expectations to stretching end ground tackle quality, performance;
4, un-bonded prestressed steel strand is because sheath protection can be slided, and its intensity can not play one's part to the full in beam.
Summary of the invention
The object of the invention is to be to provide a kind of ater-casting place to have bonding and the method for stretching without bonding combined prestress concrete beam, the method duration can shorten, and can bring into play bonded prestress steel hinge line and prestressing without bondn steel hinge line advantage separately.
For achieving the above object, the technical solution used in the present invention is: there are bonding and the method for stretching without bonding combined prestress concrete beam in ater-casting place, it is characterized in that it comprises the steps:
1) when the reinforcing bar binding of the Vierendeel girder 7 below the floor 6 of building, at interior prestressing without bondn steel hinge line fixed support and the bonded prestress steel hinge line fixed support of arranging of the same Vierendeel girder 7 vertical with ater-casting 3, on prestressing without bondn steel hinge line fixed support, prestressing without bondn steel hinge line 1 is set, on 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 girder 7 both sides, one end of prestressing without bondn steel hinge line 1 be fixed on floor 6 above, the other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 is all fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line 1 be connected with the sealing off and covering anchorage end (ground tackle) 11 that is arranged on the prestressing without bondn steel hinge line on floor 6 (be arranged on floor 6 above); One end of bonded prestress steel hinge line 2 be connected with the sealing off and covering anchorage end (ground tackle) 9 of bonded prestress steel hinge line that is arranged on floor 6 belows (being arranged on haunch concrete 10 places);
2) first pour into a mould concrete and the haunch concrete 10 of Vierendeel girder 7, pour into a mould again the concrete of floor 6, 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 girder 7 both sides;
3) when Vierendeel girder 7 and floor 6 reach its design strength 75% time, prestressing without bondn steel hinge line 1 on pretensioning floor 6, after meeting design requirement, stop stretch-draw, one end of prestressing without bondn steel hinge line 1 at sealing off and covering anchorage end 11 places of prestressing without bondn steel hinge line by tight prestressing without bondn steel hinge line 1 anchor; Then the bonded prestress steel hinge line 2 of stretch-draw floor 6 belows, after meeting design requirement, stop stretch-draw, one 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 by 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 is all fixed on ground tackle on the side column or side bar of building).
Described combined prestress concrete beam is in same Vierendeel girder 7, to be provided with bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1, is called combined prestress concrete beam.
The invention belongs to civil construction project field, the to the effect that bonded prestress steel hinge line of research and prestressing without bondn steel hinge line are tied two-in-one combined prestress concrete beam construction technology, and first, prestressing technique is at home and abroad used widely.But be the single application form of structure 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 there is obvious advantage, have bonding and more can embody both advantage without the two-in-one combined prestress concrete beam of bonding; The second, the method for the 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 novelty, in construction, solve following problem: 1. there is bonding at ater-casting place and applies without the two-in-one prestressed concrete beam of bonding, fully complementation has bonding and prestressing without bondn advantage separately, the minimizing beam degree of disturbing under load action in use; Solve the large (40kN/m of preloading load
2) a designing requirement difficult problem; The method can reduce the loss of prestress of prestressed concrete, gives full play to bonding and un-bonded prestressed steel strand advantage separately.2. ater-casting place bonded prestress steel hinge line stretching end layout, installation, stretch-draw problem have been solved; 3. solved the problem of ater-casting place prestressing without bondn steel hinge line layout, installation, stretch-draw; 4. combined prestress concrete beam construction speed and Cost Problems have been solved.
Due to structure overlength, in order to ensure that prestress wire reaches optimum state in the stress of the whole frame construction of pulling anchor cable stage, whole prestressing force floor structure will utilize ater-casting to separate stretch-draw.If ater-casting is across interior stretching end at the bottom of plate, constructor will arrive quite difficulty of operation in 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: have the prestressing force steel hinge line stretching end of bonding in plate bottom application work, un-bonded prestressed steel strand is constructed onboard.Arrange like this duration to shorten original 1/3, provide guarantee for removing in advance support body.Upstairs stretch-draw prestressing force steel hinge line can not only be ensured the quality of products, and does not need to set up job platform, more can ensure safety.
The invention has the beneficial effects as follows: the method duration can shorten.There are bonding and the application without the two-in-one combined prestress concrete beam of bonding, can further reduce the loss of prestress of prestressed concrete, further reduce the in use degree of disturbing under load action of prestressed concrete beam, 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.
Brief description of the drawings
Fig. 1 is combined prestress concrete beam arrangement diagram of the present invention (in figure, main frame beam is combined prestress concrete beam in length and breadth);
Fig. 2 is stretching end figure under ater-casting place combined prestress concrete beam plate; (post in figure is the post under floor plate);
Fig. 3 is that ater-casting place has bonding and without bonding combined prestress concrete beam floor map; (in figure, bonded prestress steel hinge line 2 is restrainted 24, and prestressing without bondn steel hinge line 2 is restrainted 4);
Fig. 4 be ater-casting place have bonding and without bonding combined prestress concrete beam E-E generalized section (in Fig. 3, E-E analyses and observe);
Fig. 5 be ater-casting place have bonding and without bonding combined prestress concrete beam F-F generalized section (in Fig. 3, F-F analyses and observe);
In figure: A, B, C, D district are that two floor plates are divided block by 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.
Detailed description of the invention
As Figure 1-5, there are bonding and the method for stretching without bonding combined prestress concrete beam in ater-casting place, and it comprises the steps:
1) when the reinforcing bar binding of the Vierendeel girder 7 below the floor 6 of building, at interior prestressing without bondn steel hinge line fixed support and the bonded prestress steel hinge line fixed support of arranging of the same Vierendeel girder 7 vertical with ater-casting 3, on prestressing without bondn steel hinge line fixed support, prestressing without bondn steel hinge line 1 is set, on 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 girder 7 both sides, one end of prestressing without bondn steel hinge line 1 be fixed on floor 6 above, the other end of bonded prestress steel hinge line 2 and prestressing without bondn steel hinge line 1 is all fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line 1 be connected with the sealing off and covering anchorage end (ground tackle) 11 that is arranged on the prestressing without bondn steel hinge line on floor 6 (be arranged on floor 6 above); One end of bonded prestress steel hinge line 2 be connected with the sealing off and covering anchorage end (ground tackle) 9 of bonded prestress steel hinge line that is arranged on floor 6 belows (being arranged on haunch concrete 10 places);
2) first pour into a mould concrete and the haunch concrete 10 of Vierendeel girder 7, pour into a mould again the concrete of floor 6, 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 girder 7 both sides;
3) when Vierendeel girder 7 and floor 6 reach its design strength 75% time, prestressing without bondn steel hinge line 1 on pretensioning floor 6, after meeting design requirement, stop stretch-draw, one end of prestressing without bondn steel hinge line 1 at sealing off and covering anchorage end 11 places of prestressing without bondn steel hinge line by tight prestressing without bondn steel hinge line 1 anchor; Then the bonded prestress steel hinge line 2 of stretch-draw floor 6 belows, after meeting design requirement, stop stretch-draw, one 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 by 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 is all fixed on ground tackle on the side column or side bar of building).
Claims (1)
1. there are bonding and the method for stretching without bonding combined prestress concrete beam in ater-casting place, it is characterized in that it comprises the steps:
1) in the time of the reinforcing bar binding of the Vierendeel girder (7) of floor (6) below of building, prestressing without bondn steel hinge line fixed support and bonded prestress steel hinge line fixed support are set in the same Vierendeel girder (7) vertical with ater-casting (3), prestressing without bondn steel hinge line (1) is set on prestressing without bondn steel hinge line fixed support, on 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 on floor (6) above, the other end of bonded prestress steel hinge line (2) and prestressing without bondn steel hinge line (1) is all fixed on the side column or side bar of building;
One end of prestressing without bondn steel hinge line (1) is connected with the sealing off and covering anchorage end (11) that is arranged on the prestressing without bondn steel hinge line on floor (6); One end of bonded prestress steel hinge line (2) is connected with the sealing off and covering anchorage end (9) of the bonded prestress steel hinge line that is arranged on floor (6) below;
2) first pour into a mould concrete and the haunch concrete (10) of Vierendeel girder (7), pour into a mould again the concrete of floor (6), 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% time, prestressing without bondn steel hinge line (1) on pretensioning floor (6), after meeting design requirement, stop stretch-draw, one end of prestressing without bondn steel hinge line (1) is located tight prestressing without bondn steel hinge line (1) anchor at the sealing off and covering anchorage end (11) of prestressing without bondn steel hinge line; Then the bonded prestress steel hinge line (2) of stretch-draw floor (6) below, after meeting design requirement, stop stretch-draw, one end of bonded prestress steel hinge line (2) is located with ground tackle tight bonded prestress steel hinge line (2) anchor 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 |
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| 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 CN102535861A (en) | 2012-07-04 |
| CN102535861B true CN102535861B (en) | 2014-09-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN112900882B (en) * | 2021-01-22 | 2022-10-18 | 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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|---|---|---|---|---|
| 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 |
| CN201372441Y (en) * | 2009-02-24 | 2009-12-30 | 刘志刚 | Bonded and unbonded prestressed concrete basement structure |
| 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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2011
- 2011-12-29 CN CN201110451654.2A patent/CN102535861B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN201372441Y (en) * | 2009-02-24 | 2009-12-30 | 刘志刚 | Bonded and unbonded prestressed concrete basement structure |
| 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 |
| 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 |
| 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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| CN102535861A (en) | 2012-07-04 |
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