CN100398760C - No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method - Google Patents
No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method Download PDFInfo
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- CN100398760C CN100398760C CNB2004100554367A CN200410055436A CN100398760C CN 100398760 C CN100398760 C CN 100398760C CN B2004100554367 A CNB2004100554367 A CN B2004100554367A CN 200410055436 A CN200410055436 A CN 200410055436A CN 100398760 C CN100398760 C CN 100398760C
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Abstract
The present invention relates to an unbonded finish rolling twisted steel bar, an anchoring system and a construction method thereof. The unbonded finish rolling twisted steel bar is composed of a finish rolling twisted steel bar, a high-density polyethylene inner sheath, a grease layer and a high-density polyethylene outer sheath, wherein the high-density polyethylene inner sheath covers the exterior of the finish rolling twisted steel bar in the mode of hot extrusion; the grease layer is coated outside the inner sheath and has good lubricating performance; the high-density polyethylene outer sheath is positioned outside the grease layer and molded by extrusion; the inner sheath and the outer sheath can slide mutually. The anchoring system is composed of screw nuts, anchor plates, spiral bars and an unbonded finish rolling twisted steel bar, wherein the screw nuts performing an anchoring function are screwed in positions where the inner sheath and the outer sheath are stripped on both ends of the unbonded finish rolling twisted steel bar; the anchor plates are padded below the screw nuts; the spiral bars with the function of reinforcing concrete are arranged below the anchor plates on both of the two ends. The construction method comprises the working procedures of material, preparation, manufacture of unbonded finish rolling twisted steel bar segments, installation of the anchoring system, concrete pouring, tension, anchoring, anchor sealing, etc. The anchoring system has good anticorrosion performance and has the advantages of no need of grouting operation on site and simple and convenient construction method.
Description
Technical field:
The present invention relates to the job practices of a kind of presstressed reinforcing steel and prestress anchorage system thereof and this anchoring system, particularly a kind of nothing bonding finish rolling deformed bar and do not have bonding finish rolling deformed bar vertical prestressing anchoring system and job practices thereof.
Background technology:
In Prestressed Concrete Bridges, because the needs of shearing resistance are typically provided with the vertical prestressing system in the bridge web.The general structure that adopts as shown in Figure 4 of existing vertical prestressing anchoring system technical scheme: by finish rolling deformed bar 12, be screwed in that nut 16 on the finish rolling deformed bar and anchor plate 15 form the finish rolling deformed bar of bonding anchoring system arranged, between the anchor plate of two ends He outside the finish rolling deformed bar, bellows 13 is arranged, all be placed with spiral bar 14 below the anchor plate of two ends, after stretch-draw is finished, be pressed into cement paste 11 at bellows 13 and 12 of finish rolling deformed bars by madjack pipe 17 and discharge pipe 18.This technical scheme has the following disadvantages:
1, the presstressed reinforcing steel of Cai Yonging is a light face finish rolling deformed bar, no any anti-corrosion measure on it, and its antiseptic property is relatively poor;
2, anticorrosion for presstressed reinforcing steel, and with the globality of member, must perfusion mortar because must the perfusion epoxy mortar, this system needs on-the-spot mud jacking operation, is not easy to construction and management;
3, owing to will carry out the mud jacking construction, it is full and the obstructed problem of mud jacking occurs be difficult to solve mud jacking, and because of big, the peripheral area of the rigidity of high-strength finish rolling deformed bar own little, adding not full just being difficult to of mud jacking plays bonding, bonds effect, influence the antiseptic property of presstressed reinforcing steel, it is unfavorable to cause member;
4, the shared cross-sectional area of this system is bigger, influences the strength and stiffness of member, and it is unfavorable to cause member;
5, construction technology is complicated, and expense is higher, and the duration is longer.
In addition, also have in the existing vertical prestressing anchoring system and adopt non-bending steel cable to make presstressed reinforcing steel, but, also be unsuitable for making the vertical prestressing anchoring system of bridge web because of the characteristics of non-bending steel cable own.
Summary of the invention:
The technical problem to be solved in the present invention is the existing finish rolling deformed bar that adopts, be screwed in existing the problems referred to above of vertical prestressing anchoring system that nut on the finish rolling deformed bar and anchor plate are formed, providing a kind of can improve the finish rolling deformed bar antiseptic property and be beneficial to the nothing bonding finish rolling deformed bar of construction and adopt the nothing bonding finish rolling deformed bar anchoring system and the job practices thereof of this reinforcement fabrication, it is good that this system has an antiseptic property, improved the security performance of member and anchoring system, littler than the cross-sectional area of the vertical prestressing anchoring system that has the bonding finish rolling deformed bar to make, need not on-the-spot mud jacking operation, be convenient to advantages such as construction.
The technical scheme that solves its above-mentioned technical problem is: a kind of nothing bonding finish rolling deformed bar, it is characterized in that: this nothing bonding finish rolling deformed bar is overlayed on the outer high density polyethylene (HDPE) inner sheath of finish rolling deformed bar by finish rolling deformed bar, employing hot extrude mode, be coated in inner sheath and have the oil layer of good anticorrosion and greasy property outward and be positioned at the high density polyethylene (HDPE) oversheath formation that oil layer outside extrusion molding is shaped, this inner sheath is the circular covering layer of slightly larger in diameter in the Major Diam of finish rolling deformed bar; And can slide mutually under external force between finish rolling deformed bar hot extrude all-in-one-piece inner sheath and the oversheath.
A kind of nothing bonding finish rolling deformed bar prestress anchorage system, form by presstressed reinforcing steel, nut, anchor plate, spiral bar, it is characterized in that: described presstressed reinforcing steel is not have the bonding finish rolling deformed bar, peel off inside and outside sheath place at nothing bonding finish rolling deformed bar two ends and be screwed with the nut that plays anchorage effect, under nut, be lined with anchor plate, under the anchor plate of two ends, lay the spiral bar that adds the reinforced concrete effect.
The job practices of above-mentioned nothing bonding finish rolling deformed bar prestress anchorage system may further comprise the steps:
A, get the raw materials ready: the nothing bonding finish rolling deformed bar section to fixed length is carried out preliminary treatment:
1, make the nothing bonding finish rolling deformed bar section that needs length:
1) make the nothing bonding finish rolling deformed bar that needs length: hot extrude one hdpe layer inner sheath outside finish rolling deformed bar, this inner sheath slightly larger in diameter forms circular covering layer in the Major Diam of finish rolling deformed bar; Outside inner sheath, apply the grease that one deck has good anticorrosion and greasy property then; Last at the outside of oil layer extrusion molding one hdpe layer oversheath, inner sheath and finish rolling deformed bar hot extrude are integral, under the lubrication of oil layer, and under less external force effect, can slide mutually between finish rolling deformed bar hot extrude all-in-one-piece inner sheath and the oversheath;
2), length requirement will not have the bonding finish rolling deformed bar and carry out intercept, produces the nothing bonding finish rolling deformed bar section that needs length on demand;
2, do not carry out preliminary treatment to there being bonding finish rolling deformed bar section two ends:
Require to divest the inside and outside sheath that does not have bonding finish rolling deformed bar two ends according to stretch-draw, anchoring and protection presstressed reinforcing steel, the finish rolling deformed bar that is coated with inner sheath can be pulled out oversheath as required and divest inner sheath, and the finish rolling deformed bar that will divest inside and outside sheath is cleaned out;
B, making, installation anchoring system:
At member the position of not having bonding finish rolling deformed bar anchoring system need be installed, the nut of anchoring effect of having screwed at the two ends that pretreated nothing bonding finish rolling deformed bar section has been peelled off interior oversheath, at nut underlay anchor plate, under the anchor plate of two ends, lay the spiral bar that adds the reinforced concrete effect, make the oversheath and the two ends anchor plate that do not have the bonding finish rolling deformed bar closely linked;
C, fluid concrete:
The job practices of fluid concrete does not have fluid concrete between the bonding finish rolling deformed bar anchoring system at each routinely, and attention can not drain to concrete grout on the inner sheath;
D, stretch-draw, anchoring:
After concrete to be cast reaches design stretch-draw requires, do not carry out stretch-draw, anchoring to there being the bonding finish rolling deformed bar;
During stretch-draw, the finish rolling deformed bar that is coated with inner sheath slides in oversheath owing to stretching extension, and under short presstressed reinforcing steel situation, frictional force is ignored; Presstressed reinforcing steel is long, calculates the size that needs overcome friction by friction factor, replenishes stretch-draw;
E, sealing off and covering anchorage:
After stretch-draw is finished, the stretch-draw end is carried out the sealing off and covering anchorage operation, in preformed groove, fill up cement mortar or epoxy mortar.
The present invention's nothing bonding finish rolling deformed bar and do not have bonding finish rolling deformed bar prestress anchorage system and job practices has bonding finish rolling deformed bar and vertical prestressing anchoring system and job practices thereof thereof to compare with existing has following beneficial effect:
1, improved the antiseptic property of finish rolling deformed bar;
Because nothing bonding finish rolling deformed bar of the present invention has adopted double-deck PE cover and has been positioned at triple protection of the cosmoline fat layer of double-deck PE cover centre, has improved the antiseptic property of finish rolling deformed bar greatly;
2, improved the security performance of member and anchoring system:
Because the present invention's nothing bonding finish rolling deformed bar anchoring system has adopted the good nothing bonding finish rolling deformed bar of antiseptic property as presstressed reinforcing steel, do not need the cross-sectional area bellows being installed, having been reduced system during construction, need not be in the milk, eliminated grouting leakiness etc. to anchoring system unfavorable factor, improve the antiseptic power and the general safety performance of anchoring system, thereby guaranteed the security performance of member;
3, simplify construction technology, reduced the construction costs cost:
Because having the bonding finish rolling deformed bar, the present invention do not adopted double-deck PE sheath protection, use the nothing bonding finish rolling deformed bar vertical prestressing anchoring system that this reinforcing bar is made, need not to carry out scene grouting and bellows is installed, simplified construction technology greatly, reduced the construction costs cost, accelerated construction speed, used in addition presstressed reinforcing steel---do not have between the double-deck PE sheath of bonding finish rolling deformed bar the oil layer with good lubrication performance is arranged, and under less action force, can slide mutually between finish rolling deformed bar hot extrude all-in-one-piece inner sheath and the high density polyethylene (HDPE) oversheath, its frictional force is little during stretch-draw, good to neutrality, stretch-draw is convenient.
Below, in conjunction with the accompanying drawings and embodiments the present invention's the nothing bonding finish rolling deformed bar and the technical characterictic of anchoring system and job practices thereof are further described.
Description of drawings:
Fig. 1～Fig. 2: the present invention's nothing bonding finish rolling deformed bar structural representation, wherein Fig. 2 is the left view of Fig. 1;
Fig. 3: the present invention's nothing bonding finish rolling deformed bar anchoring system structure and user mode reference diagram;
Fig. 4: existing vertical prestressing anchoring system structural representation.
The specific embodiment:
Embodiment one:
A kind of nothing bonding finish rolling deformed bar, by finish rolling deformed bar 1, employing hot extrusion mode is overlayed on the high density polyethylene (HDPE) inner sheath 2 outside the finish rolling deformed bar 1, be coated in inner sheath 2 outer high density polyethylene (HDPE) oversheath 4 formations that have the oil layer 3 of good lubrication performance and be positioned at oil layer 3 outside extrusion moldings formation, this inner sheath 2 is slightly larger in diameter circular covering layers in the Major Diam of finish rolling deformed bar, and can slide mutually under external force between finish rolling deformed bar 1 hot extrude all-in-one-piece inner sheath 2 and the high density polyethylene (HDPE) oversheath 4, the grease with good lubrication performance of described oil layer 3 perfusions be have anticorrosion, the unbonded prestressing tendon special anti-corrosion lubricant grease of lubricating function is (referring to Fig. 1, Fig. 2).
Embodiment two:
A kind of nothing bonding finish rolling deformed bar prestress anchorage system.As shown in Figure 3, this does not have bonding finish rolling deformed bar anchoring system by nut 5, anchor plate 6, spiral bar 7, not having bonding finish rolling deformed bar 8 forms, this does not have bonding finish rolling deformed bar 8 by finish rolling deformed bar 1, employing hot extrusion mode is overlayed on the high density polyethylene (HDPE) inner sheath 2 outside the finish rolling deformed bar 1, be coated in inner sheath 2 outer high density polyethylene (HDPE) oversheath 4 formations that have the oil layer 3 of good lubrication performance and be positioned at oil layer 3 outside extrusion moldings formation, this inner sheath 2 is slightly larger in diameter circular covering layers in the Major Diam of finish rolling deformed bar, and can slide mutually under external force (referring to Fig. 1 between finish rolling deformed bar 1 hot extrude all-in-one-piece inner sheath 2 and the high density polyethylene (HDPE) oversheath 4, Fig. 2), peelled off the nut 5 that interior oversheath place has been screwed with the anchoring effect at nothing bonding finish rolling deformed bar 8 two ends, be lined with anchor plate 65 times at nut, under the anchor plate of two ends, lay the spiral bar 7 (referring to Fig. 3) that adds the reinforced concrete effect.By the stretch-draw finish rolling deformed bar, fastening nut has stoped the retraction of finish rolling deformed bar after putting, thereby introduces prestressing force.
Among Fig. 3, the 9th, being cast in each does not have the concrete that bonds between the finish rolling deformed bar anchoring system, and the 10th, when being carried out the sealing off and covering anchorage operation, fills up at the stretch-draw end cement mortar or epoxy mortar in preformed groove.
Embodiment three:
The job practices of above-mentioned nothing bonding finish rolling deformed bar anchoring system may further comprise the steps:
A, get the raw materials ready: the nothing bonding finish rolling deformed bar section to fixed length is carried out preliminary treatment:
1, make the nothing bonding finish rolling deformed bar section that needs length:
1) makes the nothing bonding finish rolling deformed bar that needs length: hot extrude one hdpe layer inner sheath 2 outside finish rolling deformed bar 1, this inner sheath slightly larger in diameter is in the Major Diam of finish rolling deformed bar, form circular covering layer, outside inner sheath 2, apply the oil layer 3 that one deck has good anticorrosion and greasy property then, last at the outside of oil layer 3 extrusion molding one hdpe layer oversheath 4, inner sheath 2 is integral with finish rolling deformed bar 1 hot extrude, under the lubrication of oil layer 3, and can slide mutually under external force between finish rolling deformed bar hot extrude all-in-one-piece inner sheath 2 and the oversheath 4 (referring to Fig. 1, Fig. 2);
2) length requirement will not have the bonding finish rolling deformed bar and carry out intercept, produces the nothing bonding finish rolling deformed bar section that needs length on demand;
2, do not carry out preliminary treatment to there being bonding finish rolling deformed bar section two ends: require to divest the inside and outside sheath that does not have bonding finish rolling deformed bar two ends according to stretch-draw, anchoring and protection presstressed reinforcing steel, the finish rolling deformed bar that is coated with inner sheath can be pulled out oversheath as required and divest;
B, making, installation anchoring system:
At member the position of not having bonding finish rolling deformed bar anchoring system need be installed, the nut 5 of anchoring effect of having screwed at the two ends that pretreated nothing bonding finish rolling deformed bar section has been peelled off interior oversheath, at nut underlay anchor plate 6, lay the spiral bar 7 that adds the reinforced concrete effect under the anchor plate of two ends, the oversheath 4 that requires in the construction not have bonding finish rolling deformed bar 8 is closely linked to two ends anchor plate 6;
C, fluid concrete: the job practices of fluid concrete does not have fluid concrete 9 between the bonding finish rolling deformed bar anchoring system at each routinely, and attention can not drain to concrete grout on the inner sheath;
D, stretch-draw, anchoring:
After concrete to be cast reaches design stretch-draw requires, do not carry out stretch-draw, anchoring to there being the bonding finish rolling deformed bar;
During stretch-draw, the finish rolling deformed bar that is coated with inner sheath slides in oversheath owing to stretching extension, because the lubrication of oil layer is arranged, and interior oversheath all is smooth high-density polyethylene material, under short presstressed reinforcing steel situation, frictional force is ignored; Presstressed reinforcing steel is long, calculates the size that needs overcome friction by friction factor, replenishes stretch-draw;
E, sealing off and covering anchorage:
After stretch-draw is finished, the stretch-draw end is carried out the sealing off and covering anchorage operation, in preformed groove, fill up cement mortar or epoxy mortar 10, so that protection stretch-draw end ground tackle and finish rolling deformed bar.
As the making described in the embodiment of the invention three need the nothing bonding finish rolling deformed bar of length can carry out at the construction field (site), also can be prefabricated in factory.
Claims (3)
1. one kind is not had the bonding finish rolling deformed bar, it is characterized in that: described nothing bonding finish rolling deformed bar is by finish rolling deformed bar (1), adopt the hot extrude mode to be overlayed on the outer high density polyethylene (HDPE) inner sheath (2) of finish rolling deformed bar (1), be coated in outer high density polyethylene (HDPE) oversheath (4) formation that has the oil layer (3) of good anticorrosion and greasy property and be positioned at the extrusion molding formation of oil layer (3) outside of inner sheath (2), this inner sheath (2) is the circular covering layer of slightly larger in diameter in the Major Diam of finish rolling deformed bar, and can slide mutually under external force between finish rolling deformed bar (1) hot extrude all-in-one-piece inner sheath (2) and the high density polyethylene (HDPE) oversheath (4).
2. one kind is not had bonding finish rolling deformed bar prestress anchorage system, form by presstressed reinforcing steel (8), nut (5), anchor plate (6), spiral bar (7), it is characterized in that: described presstressed reinforcing steel (8) is the described nothing bonding of claim 1 finish rolling deformed bar, peelled off the nut (5) that interior oversheath place has been screwed with the anchoring effect at nothing bonding finish rolling deformed bar (8) two ends, under nut (5), be lined with anchor plate (6), under the anchor plate of two ends, lay the spiral bar (7) that adds the reinforced concrete effect.
3. the job practices of nothing bonding finish rolling deformed bar anchoring system according to claim 2 may further comprise the steps:
A, get the raw materials ready: the nothing bonding finish rolling deformed bar section to fixed length is carried out preliminary treatment:
1. make the nothing bonding finish rolling deformed bar section that needs length:
1) makes the nothing bonding finish rolling deformed bar that needs length: hot extrude one hdpe layer inner sheath (2) outside finish rolling deformed bar (1), this inner sheath slightly larger in diameter is in the Major Diam of finish rolling deformed bar, form circular covering layer, outside inner sheath (2), apply the oil layer (3) that one deck has good anticorrosion and greasy property then, at last at the outside extrusion molding one hdpe layer oversheath (4) of oil layer (3), inner sheath (2) is integral with finish rolling deformed bar (1) hot extrude, under the lubrication of oil layer (3), and can slide mutually under external force between finish rolling deformed bar hot extrude all-in-one-piece inner sheath (2) and the oversheath (4);
2), length requirement will not have the bonding finish rolling deformed bar and carry out intercept, produces the nothing bonding finish rolling deformed bar section that needs length on demand;
2. do not carry out preliminary treatment to there being bonding finish rolling deformed bar section two ends: require to divest the inside and outside sheath that does not have bonding finish rolling deformed bar two ends according to stretch-draw, anchoring and protection presstressed reinforcing steel, the finish rolling deformed bar that is coated with inner sheath can be pulled out oversheath as required and divest;
B, making, installation anchoring system:
At member the position of not having bonding finish rolling deformed bar anchoring system need be installed, the nut (5) of anchoring effect of having screwed at the two ends that pretreated nothing bonding finish rolling deformed bar section has been peelled off interior oversheath, at nut underlay anchor plate (6), lay under the anchor plate of two ends and have the spiral bar (7) that adds the reinforced concrete effect, the oversheath (4) that requires not have bonding finish rolling deformed bar (8) in the construction is closely linked with two ends anchor plate (6);
C, fluid concrete: the job practices of fluid concrete does not have fluid concrete (9) between the bonding finish rolling deformed bar anchoring system at each routinely;
D, stretch-draw, anchoring:
After concrete to be cast reaches design stretch-draw requires, do not carry out stretch-draw, anchoring to there being the bonding finish rolling deformed bar;
During stretch-draw, the finish rolling deformed bar that is coated with inner sheath slides in oversheath owing to stretching extension, and under short presstressed reinforcing steel situation, frictional force is ignored; Presstressed reinforcing steel is long, calculates the size that needs overcome friction by friction factor, replenishes stretch-draw;
E, sealing off and covering anchorage:
After stretch-draw is finished, the stretch-draw end is carried out the sealing off and covering anchorage operation, in preformed groove, fill up cement mortar or epoxy mortar (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100554367A CN100398760C (en) | 2004-07-27 | 2004-07-27 | No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100554367A CN100398760C (en) | 2004-07-27 | 2004-07-27 | No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method |
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| CN1727599A CN1727599A (en) | 2006-02-01 |
| CN100398760C true CN100398760C (en) | 2008-07-02 |
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| CN101929131B (en) * | 2010-09-08 | 2012-07-04 | 哈尔滨工业大学 | Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab |
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| CN103924729B (en) * | 2014-04-11 | 2016-10-26 | 北京工业大学 | End sections unbonded reinforcement beams of concrete and preparation method |
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| CN105544871A (en) * | 2016-02-03 | 2016-05-04 | 柳州欧维姆机械股份有限公司 | Low-shrinkage finely-rolled threaded bar pre-stressed anchoring system and construction method thereof |
| CN106643850B (en) * | 2016-10-27 | 2019-05-14 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of hydraulic instrument pedestal |
| CN111975981B (en) * | 2020-07-28 | 2021-05-07 | 南京钜力智能制造技术研究院有限公司 | End stretching device for prefabricated part |
| CN111958809B (en) * | 2020-08-20 | 2022-04-08 | 凡天建筑科技有限公司 | Method for manufacturing precast pile rod |
| CN115288125A (en) * | 2022-08-15 | 2022-11-04 | 上海同人里岩土工程技术有限公司 | Prestressed cast-in-situ bored pile and construction method thereof |
| CN115467340A (en) * | 2022-09-28 | 2022-12-13 | 上海同人里岩土工程技术有限公司 | Foundation pit enclosure prefabricated component and construction method thereof |
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