CN100396868C - Prestressed anchoring system by high tensile steel wire pretension and construction method thereof - Google Patents
Prestressed anchoring system by high tensile steel wire pretension and construction method thereof Download PDFInfo
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- CN100396868C CN100396868C CNB2004100454354A CN200410045435A CN100396868C CN 100396868 C CN100396868 C CN 100396868C CN B2004100454354 A CNB2004100454354 A CN B2004100454354A CN 200410045435 A CN200410045435 A CN 200410045435A CN 100396868 C CN100396868 C CN 100396868C
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Abstract
The present invention relates to a prestressed anchoring system for high tensile steel wires and a construction method thereof. The prestressed anchoring system for high tensile steel wires comprises n anchoring units, and each anchoring unit comprises an anchoring plate at a fixing end, an anchoring plate at a tensioning end, a heading nut and a prestressed annular steel wire bundle. The prestressed annular steel wire bundle is formed by that one end of each steel wire in a high tensile steel wire bundle with fixed length is anchored on the anchoring plate at the fixing end, the other end is headed on the heading nut, and the steel wires of the high tensile steel wire bundle with fixed length are annularly and tightly distributed. The heading nut is connected with the anchoring plate at the tensioning end, a casing tube is arranged in the annular high strength steel wire bundle, m reinforcing rings are arranged between the high strength steel wire bundle and the casing tube, and the casing tube is filled with mortar. The construction method comprises the procedures of single high tensile steel wire prestressed anchoring system unit member manufacture and placement, concrete pouring, movable support rod taking, grouting and anchorage sealinig. The prestressed anchoring system has the advantages of less prestress loss, less deviation of uncertainty, good adhesion holding property with cement mortar and good safety performance of the member. The construction method has the advantages of compactness and convenience and improves the construction property of the member simultaneously.
Description
Technical field
The present invention relates to a kind of prestress anchorage system, particularly a kind of 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.Existing vertical prestressing anchoring system generally by finish rolling deformed bar 16, be screwed in the post tensioning prestress system that nut 14 on the finish rolling deformed bar and anchor plate 15 are formed, carry out stretch-draw by 13 pairs of finish rolling deformed bars of tensioning equipment, then nut 14 is tightened, the retraction that stops finish rolling deformed bar by anchor plate and concrete foundation, thereby introducing prestressing force, essential structure is referring to shown in Figure 5, and this technical pattern is simple, easy to operate, but following deficiency is also arranged:
1, the screw thread of finish rolling deformed bar is rolling forming, and accuracy of thread is relatively poor, and screw thread unavoidably produces moderate finite deformation when putting, contacts badly with nut, and it is non-constant to cause bouncing back, and causes the vertical prestressing weak effect;
2, because used presstressed reinforcing steel of this system and ground tackle are the rigidity body, as long as have error in the construction, when causing anchor plate to contact with nut with the anchor plate out of plumb, presstressed reinforcing steel produces the drift angle, the contact surface of nut and anchor plate just can not be adjacent to fully; So that prestressed reinforcement produces bigger distortion during stretch-draw because the vertical prestressing reinforcing bar is shorter, the elongation during stretch-draw seldom, the loss of ground tackle retraction is bigger, causes the reduction greatly of vertical prestressing effect;
3, because the intensity and the diameter of rolling finish rolling deformed bar are limited, it is very little to make it the prestressing force that applies by it;
4, this system is a post-tensioned construction, needs on-the-spot stretch-draw management and mud jacking operation, is not easy to construction and management;
5, owing to will carry out mud jacking construction, be difficult to solve the full problem of mud jacking, and big, the peripheral area of the rigidity of high-strength finish rolling deformed bar own is little, adds that mud jacking is not full to play bonding, bond effect that it is unfavorable to cause member with regard to difficulty.
Summary of the invention
The technical problem to be solved in the present invention is: existing by finish rolling deformed bar, it is non-constant to be screwed in the above-mentioned reinforcing bar retraction that rigidity vertical prestressing anchoring system that nut on the finish rolling deformed bar and anchor plate form exists, elongation during stretch-draw seldom, the loss of ground tackle retraction is bigger, the vertical prestressing effect is relatively poor, with concrete binding, not so good and the inconvenient problem of execution control of the effect of bonding, provide a kind of low with bending stiffness, the high tensile steel wire that flexibility is good is flexible vertical prestressing anchoring system---high tensile steel wire pre-tensioned prestressing anchoring system and the job practices thereof that presstressed reinforcing steel constitutes, it is little that this system has the little and uncertain deviation of loss of prestress, good with bonding property of cement paste bonding, the advantage that the security performance of member is good, its job practices compactness, conveniently, improved the workability of member simultaneously.
The technical scheme that solves its above-mentioned technical problem is: a kind of high tensile steel wire pre-tensioned prestressing anchoring system, comprise n anchoring unit, it is characterized in that: each anchoring unit is by the fixed end anchor slab, stretch-draw end anchor slab, heading nut and prestressing force annular steel tendon constitute, this prestressing force annular steel tendon is to be anchored at fixedly on the anchor slab by the heading anchorage style by an end of each root steel wire of the high-strength steel tow with fixed length, other end heading constitutes on the heading nut has prestressed hollow solid matter annular steel tendon, and link to each other with stretch-draw end anchor slab by the heading nut, this stretch-draw end anchor slab can move with the stretching extension of prestressing force annular steel tendon, sleeve pipe places in the prestressing force annular steel tendon, m reinforcing ring places between prestressing force annular steel tendon and the sleeve pipe, perfusion mortar in the sleeve pipe, above-mentioned 1≤n≤100,2≤m≤20.
The job practices of above-mentioned a kind of high tensile steel wire pre-tensioned prestressing anchoring system may further comprise the steps:
A: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of making band stretch-draw movable brace rod:
(1), make the high tensile steel wire section: length intercepts into section with high tensile steel wire on request;
(2), make prestressing force annular steel tendon: by heading the formation of bulb-end anchorage solid phase company is carried out with heading nut and fixed end anchor slab respectively in each high tensile steel wire two ends and have prestressed hollow solid matter annular steel tendon;
(3), heading nut and stretch-draw end anchor slab and stretch-draw cover are by being threaded;
(4), in prestressing force annular solid matter steel tendon, place sleeve pipe and between annular steel tendon and sleeve pipe, dispose the individual reinforcing ring of m (2≤m≤20);
(5) place the stretch-draw movable brace rod: the movable brace rod of Len req is positioned in the sleeve pipe stretch-draw plug of screwing on;
(6) apply prestressing force: tensioning equipment moves forward elongation of annular high-strength steel tow and drive heading nut and stretch-draw end anchor plate by the stretch-draw cover, tightens the stretch-draw plug after stretch-draw puts in place, stops the retraction of high-strength steel tow by the supporting role of movable brace rod;
B: place the anchoring system unit member: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of the individual band stretch-draw movable brace rod of prefabricated n (1≤n≤100) is put into template, have a determining deviation between each unit member;
C: fluid concrete: concreting between each high tensile steel wire anchoring system unit member;
D: get movable brace rod: treat to loosen the interior stretch-draw plug of each high tensile steel wire anchoring system unit member after the concrete setting, take out movable brace rod;
E: grouting, sealing off and covering anchorage: grouting and carry out the sealing off and covering anchorage operation in the sleeve pipe of each high tensile steel wire anchoring system unit.
Owing to adopt said structure, the present invention's high tensile steel wire pre-tensioned prestressing anchoring system and job practices thereof are compared with the post tensioning vertical prestressing anchoring system that anchor plate is formed by finish rolling deformed bar, the nut that is screwed on the finish rolling deformed bar with existing, have following beneficial effect:
1, good with bonding property of cement paste bonding, also can adopt parallel indented wire to increase bonding property of bonding, increased the security performance of member;
2, owing to be connected and fixed characteristic with high tensile steel wire, and open dual-prestressed job practices earlier, make that the little and uncertain deviation of loss of prestress is little by the steel wire heading;
3, used presstressed reinforcing steel is a high tensile steel wire, and its intensity height can reduce member dead weight under the identical prestressing force situation; Anti-fatigue performance is good, can improve the security and stability of member; Its bending stiffness is low, and flexibility is good, is easy to reel, is convenient to the application of long presstressed reinforcing steel and sets up;
4, can design steel wire quantity as requested and design desired prestressed size, the prestressing force tonnage is selected arbitrarily;
5, use anchorage part pre-stressed construction method compactness, the convenience of this system, improved the workability of member simultaneously;
6, having used new prestressing force introduces system and opens dual-prestressed job practices earlier, there is not on-the-spot mud jacking operation, single high tensile steel wire pre-tensioned prestressing anchoring system unit member can be carried out prefabricated before being transported into the scene, and the single high tensile steel wire pre-tensioned prestressing anchoring system unit member that has applied pulling force can transport the samely and arrange with reinforcing bar, do not need on-the-spot stretch-draw management;
7, the high tensile steel wire pre-tensioned prestressing reaches the self-balancing of power in the single high tensile steel wire pre-tensioned prestressing anchoring system unit member by the effect of instruments such as stretch-draw strut and reinforcing ring; when fluid concrete; both protect activity stretch-draw strut, prevented the stressed back of activity stretch-draw strut unstability; protect prestressing force annular steel tendon again, made it the anchoring effect that stressed steadiness even, that guaranteed whole pre-tensioned prestressing anchoring system unit is become reconciled.
Description of drawings:
Fig. 1: the anchoring block construction schematic diagram of the present invention's high tensile steel wire pre-tensioned prestressing anchoring system;
Fig. 2: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member structural representation of the band stretch-draw movable brace rod of the present invention's high tensile steel wire pre-tensioned prestressing anchoring system;
The H of Fig. 3: Fig. 1 is enlarged diagram partly;
Fig. 4: the present invention's high tensile steel wire pre-tensioned prestressing anchoring system structural representation;
Fig. 5: existing vertical prestressing anchoring system structural representation.
The specific embodiment:
Embodiment one:
A kind of high tensile steel wire pre-tensioned prestressing anchoring system, comprise 3 anchoring unit, each anchoring unit is by fixed end anchor slab 8, stretch-draw end anchor slab 5, heading nut 4 and prestressing force annular steel tendon 6 constitute, this prestressing force annular steel tendon 6 is to be anchored at fixedly on the anchor slab 8 by the heading anchorage style by an end of each root steel wire of the high-strength steel tow with fixed length, other end heading constitutes on heading nut 4 has prestressed hollow solid matter annular steel tendon, and link to each other with stretch-draw end anchor slab 5 by heading nut 4, this stretch-draw end anchor slab 5 can move with the stretching extension of prestressing force annular steel tendon 6, sleeve pipe 10 places in the prestressing force annular steel tendon 6,2～10 reinforcing rings 9 place between prestressing force annular steel tendon 6 and the sleeve pipe 10, perfusion mortar 11 in the sleeve pipe 10, fluid concrete 12 between each anchoring unit.
The mortar 11 of perfusion can be a cement mortar in the sleeve pipe 10, also can be epoxy mortar.
A kind of conversion as the embodiment of the invention one, the quantity of anchoring unit is n in the described high tensile steel wire pre-tensioned prestressing anchoring system, the value of n is generally got 1≤n≤100, according to actual needs according to the decision of engineering consumption, n also can be greater than 100, the described quantity that places the reinforcing ring between annular steel tendon and the sleeve pipe is m, and the value of m is decided according to cable body length, is generally 2≤m≤20, according to actual needs, m also can be greater than 20.
Embodiment two:
Job practices as embodiment one described high tensile steel wire pre-tensioned prestressing anchoring system may further comprise the steps:
A: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member (referring to Fig. 3) of making band stretch-draw movable brace rod:
(1), make the high tensile steel wire section: length intercepts into section with high tensile steel wire on request;
(2), make prestressing force annular steel tendon: by heading with each high tensile steel wire two ends respectively with heading nut 4 and fixedly anchor slab 8 carry out the bulb-end anchorage solid phase and connect to form and have prestressed hollow solid matter annular steel tendon 6;
(3), heading nut 4 overlaps 3 by being threaded with stretch-draw end anchor slab 5 and stretch-draw;
(4), in annular solid matter steel tendon 6, place sleeve pipe 10 and between annular steel tendon 6 and sleeve pipe 10, dispose m reinforcing ring 9,2≤m≤20;
(5) place the stretch-draw movable brace rod: the movable brace rod 7 of Len req is positioned in the sleeve pipe 10 the stretch-draw plug 2 of screwing on;
(6) apply prestressing force: tensioning equipment 1 moves forward 6 elongations of prestressing force annular high-strength steel tow and drive heading nut 4 and stretch-draw end anchor plate 5 by stretch-draw cover 3, tighten stretch-draw plug 2 after stretch-draw puts in place, stop the retraction of prestressing force annular high-strength steel tow 6 by the supporting role of movable brace rod 7;
B: place the anchoring system unit member: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of the individual band stretch-draw movable brace rod of prefabricated n (1≤n≤100) is put into template, have a determining deviation between each unit member, the size of spacing is decided according to the construction needs;
C: fluid concrete: concreting 12 between each high tensile steel wire anchoring system unit member;
D: get movable brace rod: treat to loosen the interior stretch-draw plug of each high tensile steel wire anchoring system unit member after the concrete setting, take out movable brace rod 7;
E: grouting, sealing off and covering anchorage: the sleeve pipe 10 of each high tensile steel wire anchoring system unit in, be in the milk and carry out the sealing off and covering anchorage operation.
A kind of conversion as the embodiment of the invention, the work of described " A: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of making band stretch-draw movable brace rod " can all complete in factory, the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of prefabricated making band stretch-draw movable brace rod is transported to job site assembling, and he can unify prestressing force size that each unit member applies, guarantees the quality of unit member and be convenient to the stretch-draw management and save time, laborsaving; Also can be assembled into the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of band stretch-draw movable brace rod more at the construction field (site) at produce in factory good prestressing force annular steel tendon and accessory thereof; Certainly, also whole being operated in the on-the-spot prefabricated canopy of " making the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of band stretch-draw movable brace rod " can be made.
Claims (2)
1. high tensile steel wire pre-tensioned prestressing anchoring system, comprise n anchoring unit, fluid concrete (12) between each anchoring unit, it is characterized in that: each anchoring unit is by fixed end anchor slab (8), stretch-draw end anchor slab (5), heading nut (4) and prestressing force annular steel tendon (6) constitute, this prestressing force annular steel tendon (6) is to be anchored at fixedly on the anchor slab (8) by the heading anchorage style by an end of each root steel wire of the high-strength steel tow with fixed length, other end heading is gone up the prestressed hollow solid matter annular steel tendon that has that constitutes at heading nut (4), and link to each other with stretch-draw end anchor slab (5) by heading nut (4), this stretch-draw end anchor slab (5) can move with the stretching extension of prestressing force annular steel tendon (6), sleeve pipe (10) places in the prestressing force annular steel tendon (6), m reinforcing ring (9) places between prestressing force annular steel tendon (6) and the sleeve pipe (10), the interior perfusion mortar of sleeve pipe (10) (11), above-mentioned m, the span of n is: 1≤n≤100,2≤m≤20.
2. the job practices of high tensile steel wire pre-tensioned prestressing anchoring system according to claim 1 is characterized in that: this method may further comprise the steps:
A: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of making band stretch-draw movable brace rod:
(1), makes the high tensile steel wire section: high tensile steel wire is intercepted into section by construction requirement length;
(2), make prestressing force annular steel tendon: by heading with each high tensile steel wire two ends respectively with heading nut (4) and fixedly anchor slab (8) carry out the bulb-end anchorage solid phase and connect formation and have prestressed hollow solid matter annular steel tendon (6);
(3), with heading nut (4) and stretch-draw end anchor slab (5) and stretch-draw cover (3) by being threaded;
(4), in prestressing force annular steel tendon (6), place sleeve pipe (10) and between annular steel tendon (6) and sleeve pipe (10), dispose m reinforcing ring (9), 2≤m≤20;
(5), place the stretch-draw movable brace rod: the movable brace rod (7) of Len req is positioned in the sleeve pipe (10) the stretch-draw plug (2) of screwing on;
(6), apply prestressing force: tensioning equipment (1) moves forward prestressing force annular steel tendon (6) elongation and drive heading nut (4) and stretch-draw end anchor plate (5) by stretch-draw cover (3), tighten stretch-draw plug (2) after stretch-draw puts in place, stop the retraction of prestressing force annular steel tendon (6) by the supporting role of movable brace rod (7);
B: place the anchoring system unit member: the single high tensile steel wire pre-tensioned prestressing anchoring system unit member of the individual band stretch-draw movable brace rod of prefabricated n (1≤n≤100) is put into template, have a determining deviation between each unit member;
C: fluid concrete: concreting (12) between each high tensile steel wire pre-tensioned prestressing anchoring system unit member;
D: get movable brace rod: after treating concrete setting, loosen the stretch-draw plug (2) in each unit member in the anchoring system, take out movable brace rod (7);
E: grouting, sealing off and covering anchorage: perfusion mortar (11) and carry out the sealing off and covering anchorage operation in the sleeve pipe of each high tensile steel wire anchoring system unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100454354A CN100396868C (en) | 2004-05-19 | 2004-05-19 | Prestressed anchoring system by high tensile steel wire pretension and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100454354A CN100396868C (en) | 2004-05-19 | 2004-05-19 | Prestressed anchoring system by high tensile steel wire pretension and construction method thereof |
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| Publication Number | Publication Date |
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| CN1699709A CN1699709A (en) | 2005-11-23 |
| CN100396868C true CN100396868C (en) | 2008-06-25 |
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| CNB2004100454354A Expired - Fee Related CN100396868C (en) | 2004-05-19 | 2004-05-19 | Prestressed anchoring system by high tensile steel wire pretension and construction method thereof |
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Families Citing this family (9)
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| CA2727295A1 (en) * | 2008-06-12 | 2009-12-17 | University Of Utah Research Foundation | Anchoring, splicing and tensioning elongated reinforcement members |
| CN101922237B (en) * | 2010-08-27 | 2012-01-11 | 北京工业大学 | Connector-type tensioning and anchoring system of reinforced concrete flexural piece with prestress steel strands |
| CN102400441B (en) * | 2011-11-29 | 2013-12-11 | 中铁三局集团有限公司 | Method for installing and using cable-stayed bridge reinforced concrete cable tower prestressed system |
| CN103802211B (en) * | 2012-04-28 | 2016-02-17 | 中铁二十三局集团有限公司 | A kind of slab ballastless track concrete track slab, manufacture method and tensioning equipment thereof |
| KR101646866B1 (en) * | 2015-01-23 | 2016-08-09 | 서울시립대학교 산학협력단 | Tendon fixing system of long span fire resistance deck strained at deck end and construction method of the same |
| CN105908705A (en) * | 2016-06-23 | 2016-08-31 | 上海市政工程设计研究总院（集团）有限公司 | Prefabricated pretensioned prestressed underground continuous wall and construction method thereof |
| CN106192760A (en) * | 2016-07-22 | 2016-12-07 | 成都鹏程路桥机械有限公司 | A kind of installation method of prestressed anchor assembly |
| CN108221668B (en) * | 2018-02-02 | 2023-11-24 | 柳州桂桥缆索有限公司 | Adjustable inhaul cable for constructional engineering and tensioning method thereof |
| CN113323274A (en) * | 2021-06-21 | 2021-08-31 | 合肥四方工程机电有限责任公司 | Twisted steel anchoring structure and construction method thereof |
Citations (5)
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|---|---|---|---|---|
| GB2197360A (en) * | 1986-11-14 | 1988-05-18 | Pc Bridge Co Ltd | Prestressed concrete articles |
| CN2215538Y (en) * | 1995-04-14 | 1995-12-20 | 刘树范 | Steel wire bundle prestressed hole tie |
| US5655349A (en) * | 1995-12-21 | 1997-08-12 | Ghali; Amin | Stud-through reinforcing system for structural concrete |
| CN2576837Y (en) * | 2002-09-04 | 2003-10-01 | 柳州海威姆建筑机械有限公司 | Carbon-fier prestressed reinforcement anchoring apparatus |
| CN2701981Y (en) * | 2004-05-19 | 2005-05-25 | 柳州欧维姆机械股份有限公司 | High strength wire pre-tensioned prestressing anchor system |
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2004
- 2004-05-19 CN CNB2004100454354A patent/CN100396868C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2197360A (en) * | 1986-11-14 | 1988-05-18 | Pc Bridge Co Ltd | Prestressed concrete articles |
| CN2215538Y (en) * | 1995-04-14 | 1995-12-20 | 刘树范 | Steel wire bundle prestressed hole tie |
| US5655349A (en) * | 1995-12-21 | 1997-08-12 | Ghali; Amin | Stud-through reinforcing system for structural concrete |
| CN2576837Y (en) * | 2002-09-04 | 2003-10-01 | 柳州海威姆建筑机械有限公司 | Carbon-fier prestressed reinforcement anchoring apparatus |
| CN2701981Y (en) * | 2004-05-19 | 2005-05-25 | 柳州欧维姆机械股份有限公司 | High strength wire pre-tensioned prestressing anchor system |
Non-Patent Citations (2)
| Title |
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| 预应力锚具的选择. 王叔平.浙江建筑，第6期. 1997 |
| 预应力锚具的选择. 王叔平.浙江建筑，第6期. 1997 * |
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