CN110374335B - Steel strand prestress tensioning method - Google Patents
Steel strand prestress tensioning method Download PDFInfo
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- CN110374335B CN110374335B CN201910491726.2A CN201910491726A CN110374335B CN 110374335 B CN110374335 B CN 110374335B CN 201910491726 A CN201910491726 A CN 201910491726A CN 110374335 B CN110374335 B CN 110374335B
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- jack
- steel strand
- tool
- auxiliary clamp
- anchor ring
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a steel strand prestress tensioning method, and belongs to the technical field of prestress tensioning. The method comprises the following steps: (1) arranging a tool clamping piece in an anchor ring hole of the tool anchor ring, enabling the steel stranded wires to pass through the jack and the tool clamping piece in the anchor ring hole, and then enabling the steel stranded wires to respectively pass through the through holes in the jacking plate, so that the auxiliary clamp is fixed on the jack; (2) tensioning the steel strand by a jack; (3) after the stretching is finished, the top is reversed; (4) and (3) if the steel strand needs to be tensioned continuously, repeating the step (1), and if the steel strand does not need to be tensioned, reversely rotating the connecting plate to enable the clamping part to be separated from the edge of the piston. In the tensioning method, the clamping part is fixed with the piston on the jack by rotating the connecting plate of the auxiliary clamp, so that the auxiliary clamp can be well fixed, the installation is stable, the auxiliary clamp is well prevented from falling off, and the safety of constructors is ensured.
Description
Technical Field
The invention belongs to the technical field of prestress tensioning, and relates to a steel strand prestress tensioning method.
Background
In the cast-in-place beam construction process, the steel strand needs to be prestressed and tensioned, which is a core link, a commonly used jack is a center-through jack, and as the displacement stroke of the jack is limited, the jack can not be tensioned in place at one time in most cases, and the jack needs to be inverted for many times. And after the roof is inverted, installing the tool anchor ring again, and then installing and reinforcing the auxiliary clamp.
The tensioning method has the disadvantages that the process is complicated, the vibration generated when the subsequent auxiliary clamp is installed and reinforced influences the previously installed auxiliary clamp, so that the auxiliary clamp is loosened to a certain degree, the previous auxiliary clamp needs to be reinforced again, and in the process of installing the auxiliary clamp again, the tool clamping piece falls off to form the steel stranded wire due to improper operation of an operator, so that inconvenience is brought to the installation process, the workload of the operator is increased, the tensioning time is prolonged, and the working efficiency is not high.
Disclosure of Invention
The invention provides a steel strand prestress tensioning method aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to prevent the auxiliary clamp from falling off.
The purpose of the invention can be realized by the following technical scheme:
a steel strand prestress tensioning method is characterized in that an auxiliary clamp is used, the auxiliary clamp comprises a pushing plate and two connecting plates, a plurality of through holes are formed in the middle of the pushing plate, one end of each connecting plate is hinged with the pushing plate, and the other end of each connecting plate is provided with a clamping part, and the method comprises the following steps:
(1) arranging tool clamping pieces in an anchor ring hole of a tool anchor ring, enabling the steel stranded wires to pass through the jack and the tool clamping pieces in the anchor ring hole, enabling the steel stranded wires to respectively pass through the through holes in the jacking plate, enabling the tool anchor ring to be located between the jacking plate and a piston of the jack, rotating each connecting plate when the tool anchor ring abuts against the piston at the top end part of the jack and the jacking plate abuts against the tool anchor ring, enabling the clamping parts on the connecting plates to be clamped in the grooves at the edge of the piston of the jack, and accordingly fixing the auxiliary clamp on the jack;
(2) tensioning the steel strand by a jack: the piston of the jack is ejected out to drive the tool clamping piece, and the steel strand is anchored tightly in the tool anchor ring, so that the steel strand is pulled to realize tensioning;
(3) and (3) after the stretching is finished, carrying out inverted topping: the jack returns oil, the piston of the jack contracts back, the tool clamping piece is pushed back out of the tool anchor ring, and the anchoring action of the steel strand and the tool clamping piece is released;
(4) and (3) if the steel strand needs to be tensioned continuously, repeating the step (1), and if the steel strand does not need to be tensioned, reversely rotating the connecting plate to enable the clamping part to be separated from the edge of the piston.
The tensioning method uses the auxiliary clamp, the clamping part is clamped and fixed on the piston of the jack by rotating the connecting plate of the auxiliary clamp, the auxiliary clamp can be well fixed, the installation is stable, the auxiliary clamp is well prevented from falling off, the construction risk is reduced, and the safety is improved.
In the above method for prestress tensioning of steel strand, in the step (1), the method further comprises a step of holding a push plate of the auxiliary clamp by hand to uniformly push the clamping pieces of the tool.
In the above-mentioned method for prestress-tensioning steel strand, in step (3), a gap is formed between the pushing plate of the auxiliary clamp and the tool clamping piece. The jacking plate is not tightly attached to the tool clamping piece in the back jacking process, and the tool clamping piece and the anchor ring are slowly brought back to the original position until the back jacking is finished.
In the above-mentioned steel strand prestress tensioning method, the connecting plates are arranged oppositely, and the clamping portions are also arranged oppositely. The auxiliary clamp can be better clamped on the piston of the jack, so that the top push plate is balanced in stress, and the mounting stability is improved.
In the above steel strand prestress tensioning method, the auxiliary clamp further includes two hinges, each hinge includes a first blade and a second blade, the first blades are hinged to each other, the first blades of the hinges are fixed to the pushing plate respectively, and the second blades of the hinges are fixedly connected to one end of the corresponding connecting plate respectively. In the structure, the connecting plate is hinged with the pushing plate through a hinge.
In the above-mentioned steel strand prestress tensioning method, the joint portion includes a boss, the boss has a first flange turned inwards, the first flange has a second flange turned inwards, the boss is connected to an end of the corresponding connecting plate, the boss, the first flange and the second flange are all square, the boss and the second flange are perpendicular to the first flange, and the boss, the first flange, the second flange and the connecting plate are of an integrally formed structure. The integrated structure is convenient to process and high in strength.
Compared with the prior art, the invention has the following advantages:
1. in the tensioning method, the clamping part is fixed with the piston on the jack by rotating the connecting plate of the auxiliary clamp, so that the auxiliary clamp can be well fixed, the installation is stable, the auxiliary clamp is well prevented from falling off, and the safety of constructors is ensured.
2. The auxiliary clamp of the tensioning method is simple in structure, convenient to carry, convenient to disassemble and assemble and capable of improving the working efficiency well.
Drawings
Fig. 1 is a schematic view of an auxiliary clamp tensioning a steel strand.
Fig. 2 is a schematic structural view of the auxiliary clamp.
Fig. 3 is an enlarged view of a portion a in fig. 2.
In the figure, 1, a push plate is pushed; 2, connecting a plate; 3, through holes; 4, a clamping part; 5, a hinge; 6, a boss; 7, first flanging; 8, second flanging; 9 tool anchorage; 10 a tool jaw; 11 a jack; 12 a piston; 13 steel strand.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-2, the steel strand prestress tensioning method uses an auxiliary clamp, the auxiliary clamp includes a push plate 1 and two connecting plates 2, the middle of the push plate 1 is provided with a plurality of through holes 3, one end of each connecting plate 2 is hinged with the push plate 1, the other end of each connecting plate 2 is provided with a clamping portion 4, the method includes the following steps:
(1) arranging tool clamping pieces 10 in an anchor ring hole of a tool anchor ring 9, enabling a steel strand 13 to pass through a jack 11 and the tool clamping pieces 10 in the anchor ring hole, enabling the steel strand 13 to respectively pass through holes 3 in a push plate 1, enabling the tool anchor ring 9 to be located between the push plate 1 and a piston 12 of the jack 11, and rotating each connecting plate 2 when the tool anchor ring 9 abuts against the piston 12 at the end part of the jack 11 and the push plate 1 abuts against the tool anchor ring 9, so that a clamping part 4 on each connecting plate 2 is clamped in a groove at the edge of the piston 12 of the jack 11, and the auxiliary clamp is fixed on the jack 11;
(2) the jack 11 stretches the steel strand 13: a piston 12 of a jack 11 is ejected out to drive a tool clamping piece 10, and a steel strand 13 is anchored in a tool anchoring ring 9, so that the steel strand 13 is pulled to realize tensioning;
(3) and (3) after the stretching is finished, carrying out inverted topping: the jack 11 returns oil, the piston 12 of the jack 11 contracts back, the tool clamping piece 10 is pushed back out of the tool anchoring ring 9, and the anchoring action of the steel strand 13 and the tool clamping piece 10 is released;
(4) and (3) if the steel strand 13 needs to be tensioned continuously, repeating the step (1), and if the steel strand 13 does not need to be tensioned, reversely rotating the connecting plate 2 to enable the clamping part 4 to be separated from the edge of the piston 12.
The tensioning method uses the auxiliary clamp, the clamping part 4 is clamped and fixed on the piston 12 of the jack 11 by rotating the connecting plate 2 of the auxiliary clamp, the auxiliary clamp can be well fixed, the installation is stable, the auxiliary clamp is well prevented from falling off, the construction risk is reduced, and the safety is improved.
Preferably, in the step (1), the step of holding the ejector plate 1 of the auxiliary clamp by hand to uniformly push the tool clamping piece 10 is further included.
Preferably, in the step (3), a gap is formed between the ejector plate 1 of the auxiliary clamp and the tool clamping piece 10. In the process of inverted jacking, a certain gap exists between the tool clamping piece 10 and the tool anchor ring 9, the gap is about 1cm, firstly, the anchoring effect on the steel strand 13 can be eliminated, and secondly, the auxiliary clamp can be more smoothly brought back to the original position on the basis of eliminating the anchoring effect on the steel strand 13.
The jacking plate 1 is not tightly attached to the tool clamping piece 10 in the process of back jacking, and the tool clamping piece 10 and the tool anchoring ring 9 are slowly brought back to the original position until the back jacking is finished.
As shown in fig. 2, in the present embodiment, the connecting plates 2 are disposed opposite to each other, and the respective engaging portions 4 are also disposed opposite to each other. The structure can better ensure that the auxiliary clamp is clamped on the piston 12 of the jack 11, so that the stress of the jacking plate 1 is balanced, and the installation stability is improved.
As shown in fig. 2, in this embodiment, the auxiliary fixture further includes two hinges 5, each hinge 5 includes a first blade and a second blade hinged to each other, the first blade of each hinge 5 is fixed to the pushing plate 1, and the second blade of each hinge 5 is fixedly connected to one end of the corresponding connecting plate 2. In the structure, the connecting plate 2 is hinged with the pushing plate 1 through a hinge 5.
As shown in fig. 2 and 3, in this embodiment, the fastening portion 4 includes a boss 6, the boss 6 has a first flange 7 turned inward, the first flange 7 has a second flange 8 turned inward, the boss 6 is connected to an end of the corresponding connecting plate 2, the boss 6, the first flange 7 and the second flange 8 are all square, the boss 6 and the second flange 8 are both perpendicular to the first flange 7, and the boss 6, the first flange 7, the second flange 8 and the connecting plate 2 are integrally formed. The integrated structure is convenient to process and high in strength.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. The steel strand prestress tensioning method is characterized by using an auxiliary clamp, wherein the auxiliary clamp comprises a pushing plate (1) and two connecting plates (2), a plurality of through holes (3) are formed in the middle of the pushing plate (1), one end of each connecting plate (2) is hinged to the pushing plate (1), a clamping portion (4) is arranged at the other end of each connecting plate (2), the connecting plates (2) are arranged oppositely, and the clamping portions (4) are also arranged oppositely, and the method comprises the following steps:
(1) arranging tool clamping pieces (10) in anchor ring holes of a tool anchor ring (9), enabling steel strands (13) to penetrate through a jack (11) and the tool clamping pieces (10) in the anchor ring holes, enabling the steel strands (13) to penetrate through holes (3) in a jacking plate (1) respectively, enabling the tool anchor ring (9) to be located between the jacking plate (1) and a piston (12) of the jack (11), and rotating each connecting plate (2) when the tool anchor ring (9) abuts against the piston (12) at the end part of the jack (11) and the jacking plate (1) abuts against the tool anchor ring (9), so that clamping parts (4) on each connecting plate (2) are clamped into grooves in the edge of the piston (12) of the jack (11), and accordingly fixing an auxiliary clamp on the jack (11);
(2) the jack (11) stretches the steel strand (13): a piston (12) of the jack (11) is ejected out to drive the tool clamping piece (10), and the steel strand (13) is anchored tightly in the tool anchoring ring (9), so that the steel strand (13) is pulled to realize tensioning;
(3) and (3) after the stretching is finished, carrying out inverted topping: the jack (11) returns oil, the piston (12) of the jack (11) retracts, the tool clamping piece (10) is pushed out of the tool anchor ring (9) and the anchoring effect of the steel strand (13) and the tool clamping piece (10) is relieved;
(4) and (3) if the steel strand (13) needs to be tensioned continuously, repeating the step (1), and if the steel strand (13) does not need to be tensioned, reversely rotating the connecting plate (2) to enable the clamping part (4) to be separated from the edge of the piston (12).
2. The prestress tensioning method for steel strand as claimed in claim 1, wherein in the step (1), the step of holding the top push plate (1) of the auxiliary clamp by hand to uniformly push the tool clamping piece (10) is further included.
3. The prestress wire stretching method as set forth in claim 1, wherein in the step (3), a gap is formed between the pushing plate (1) of the auxiliary clamp and the tool jaw (10).
4. The prestress tensioning method for steel strands according to claim 1, characterized in that the auxiliary clamp further comprises two hinges (5), the hinges (5) comprise a first blade and a second blade hinged to each other, the first blade of each hinge (5) is fixed to the pushing plate (1), and the second blade of each hinge (5) is fixed to one end of the corresponding connecting plate (2).
5. The steel strand prestress tensioning method according to claim 1, wherein the clamping portion (4) comprises a boss (6), a first flanging (7) which is turned inwards is arranged on the boss (6), a second flanging (8) which is turned inwards is arranged on the first flanging (7), the boss (6) is connected to the end portion of the corresponding connecting plate (2), the boss (6), the first flanging (7) and the second flanging (8) are square, the boss (6) and the second flanging (8) are perpendicular to the first flanging (7), and the boss (6), the first flanging (7), the second flanging (8) and the connecting plate (2) are of an integrally formed structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910491726.2A CN110374335B (en) | 2019-06-06 | 2019-06-06 | Steel strand prestress tensioning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910491726.2A CN110374335B (en) | 2019-06-06 | 2019-06-06 | Steel strand prestress tensioning method |
Publications (2)
| Publication Number | Publication Date |
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| CN110374335A CN110374335A (en) | 2019-10-25 |
| CN110374335B true CN110374335B (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910491726.2A Active CN110374335B (en) | 2019-06-06 | 2019-06-06 | Steel strand prestress tensioning method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3658296A (en) * | 1970-09-24 | 1972-04-25 | Lawrence R Yegge | System for post-tensioning and anchoring prestressing tendons |
| CN202337669U (en) * | 2011-10-19 | 2012-07-18 | 中铁四局集团第一工程有限公司 | Prestress internal clamping jack |
| CN203392788U (en) * | 2013-07-01 | 2014-01-15 | 柳州黔桥工程材料有限公司 | Intelligent jack with automatic tool anchor |
| CN205555958U (en) * | 2016-02-03 | 2016-09-07 | 重庆长江预应力有限公司 | Be used for continuous tensioning equipment of hydraulic jack |
| CN106049882A (en) * | 2016-08-10 | 2016-10-26 | 中冶建工集团有限公司 | Tool anchor clamp piece limit method capable of achieving intelligent prestress tensioning |
| CN109132921A (en) * | 2018-10-26 | 2019-01-04 | 长沙小如信息科技有限公司 | A kind of stretch-draw jack |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107198323A (en) * | 2017-06-29 | 2017-09-26 | 魏子杰 | A kind of high school student's incubation canteen |
-
2019
- 2019-06-06 CN CN201910491726.2A patent/CN110374335B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3658296A (en) * | 1970-09-24 | 1972-04-25 | Lawrence R Yegge | System for post-tensioning and anchoring prestressing tendons |
| CN202337669U (en) * | 2011-10-19 | 2012-07-18 | 中铁四局集团第一工程有限公司 | Prestress internal clamping jack |
| CN203392788U (en) * | 2013-07-01 | 2014-01-15 | 柳州黔桥工程材料有限公司 | Intelligent jack with automatic tool anchor |
| CN205555958U (en) * | 2016-02-03 | 2016-09-07 | 重庆长江预应力有限公司 | Be used for continuous tensioning equipment of hydraulic jack |
| CN106049882A (en) * | 2016-08-10 | 2016-10-26 | 中冶建工集团有限公司 | Tool anchor clamp piece limit method capable of achieving intelligent prestress tensioning |
| CN109132921A (en) * | 2018-10-26 | 2019-01-04 | 长沙小如信息科技有限公司 | A kind of stretch-draw jack |
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| Publication number | Publication date |
|---|---|
| CN110374335A (en) | 2019-10-25 |
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