CN110593489A - Low-retraction prestressed tendon anchorage system and use method - Google Patents
Low-retraction prestressed tendon anchorage system and use method Download PDFInfo
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- CN110593489A CN110593489A CN201910968105.9A CN201910968105A CN110593489A CN 110593489 A CN110593489 A CN 110593489A CN 201910968105 A CN201910968105 A CN 201910968105A CN 110593489 A CN110593489 A CN 110593489A
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- steel strand
- locking
- anchor
- anchor cup
- piston
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- 210000002435 tendon Anatomy 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 239000000523 sample Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000001125 extrusion Methods 0.000 description 7
- 101150038956 cup-4 gene Proteins 0.000 description 6
- 239000011513 prestressed concrete Substances 0.000 description 5
- 238000007569 slipcasting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
-
- 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)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a low-retraction prestressed tendon anchor system and a using method thereof, belonging to the field of prestressed tendon anchors. The device comprises a steel strand, a tensioning device and a locking device, wherein when a support nut in the tensioning device is adjusted, a first anchor cup rises to a certain height to control stress within a design range, a jack is loaded to enable a piston to push a second anchor cup to rise to a design requirement, the steel strand is kept in an effective tensioning state, and the jack is normally unloaded to ensure the tensioning state of the steel strand and control the function of low retraction of the steel strand by adjusting a locking cover to the upper end face of a cylinder body. The locking cover realizes the effect of one-way transmission reverse locking by the pawl inside and the ratchet wheel outside the second anchor cup, and the relaxation caused by the stress loss in the later stage is avoided.
Description
Technical Field
The invention belongs to the technical field of prestressed tendon anchors, and particularly relates to an anchor used when a steel strand exerts prestressing stress.
Background
Before the engineering structural member bears external load, pretension stress is applied to the steel strands in the tension module, the bending resistance and rigidity of the member are improved, the occurrence time of cracks is delayed, and the durability of the member is improved. In the mechanical structure, the stress is generated in advance, and the advantages of the mechanical structure are that the rigidity of the structure can be improved, the vibration and the elastic deformation are reduced, the elastic strength of the tension module can be obviously improved, and the original resistance is stronger.
The bridge span structure is a bridge constructed by prestressed concrete. The bridge can make the concrete be pre-stressed before loading by using the reaction force of the pretension of the steel bars or steel wires (cables). No tensile stress occurs during the operation stage (called fully prestressed concrete), or there is tensile stress without cracks or cracks within the allowable width are controlled (called partially prestressed concrete). Prestressed concrete bridges have been developed greatly in the 30 s and 50 s of the 20 th century, have a main span of 90 m and are in absolute dominance in the range of medium and small spans, and are in fierce competition with steel bridges in the range of large spans. In the construction process, a certain prestress loss is generated due to various reasons, and the prestress loss is a difference value between an effective prestress actually existing in a prestressed reinforcement or steel material and a tension control stress in a prestressed concrete structure and a prestressed steel structure. The traditional method of controlling stress of prestressed reinforcement or steel during tensioning is insufficient in stability due to the fact that an anchor cup and a support nut are combined for two times of tensioning, and the influence of external factors is reduced continuously, namely, the prestressed value is gradually lost in the tensioning period and later stages, and cracks are accelerated to appear. Simultaneously jack and the common stretch-draw of support nut that traditional mode used, because anchor cup and support nut are extruded to the jack, the resistance can increase when adjusting support nut this moment and be not convenient for adjust and even can adjust, the jack will change with the interval of support nut, and prestressing force this moment will change, can not reach predetermined effect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a low-retraction prestressed tendon anchorage device system and a use method thereof.
In order to achieve the purpose, the invention adopts the following scheme:
a low-retraction prestressed tendon anchorage system comprises a steel strand, tensioning equipment and locking equipment, wherein the tensioning equipment comprises a nut base plate, a supporting nut, a first anchor cup and a jack, the nut base plate is arranged in the hollow manner and is positioned on the outer side of the steel strand, the supporting nut is arranged above the nut base plate, the first anchor cup is in threaded connection with the outer side of the supporting nut, a plurality of first through holes used for penetrating through the steel strand are uniformly formed in the first anchor cup, a first conical clamping piece is arranged in each first through hole, the jack comprises a cylinder body and a piston, the piston is positioned in the cylinder body and penetrates through the outer side of the steel strand, an extrusion block is arranged between the cylinder body and the first anchor cup, the locking equipment is arranged above the jack and comprises a locking cover, a second anchor cup and a second clamping piece, the locking cover is in threaded connection with the outer side of the second anchor cup, and second through holes coaxial with the first through holes are uniformly formed in the second anchor cup, and conical second clamping pieces are arranged in the second through holes.
Furthermore, the outer side of the steel strand, which is positioned on the inner side of the piston, is fixedly connected with a clamping sleeve, and the clamping sleeve is in interference fit with the inner wall of the piston.
Furthermore, a mounting groove is formed in the bottom side end of the locking cover, a pawl is arranged in the mounting groove, a ratchet wheel matched with the pawl is arranged on the outer side of the second anchor cup, a convex piece is arranged on the inner wall of the ratchet wheel, a sliding groove used for mounting the convex piece is formed in the bottom side end of the second anchor cup, a spring is arranged in the sliding groove, one end of the spring is connected with the convex piece, and the other end of the spring is connected with the piston.
Furthermore, the top of locking lid is equipped with the apron, the amesdial is installed to the center of apron, the probe of amesdial extends to on the second anchor cup upper surface.
Furthermore, the distance from the cover plate to the cylinder body is 10-15 mm greater than the distance from the end face of the steel strand positioned on the inner side of the locking cover to the upper surface of the piston.
Further, the top part of the extrusion block is nested in the cylinder body, the bottom of the extrusion block is concave and partially nested outside the first anchor cup.
Furthermore, a grouting hole and an exhaust hole are formed in the first anchor cup.
The invention also discloses a use method of the low-retraction prestressed tendon anchor system, which comprises the following steps,
s1, installing the steel strand, the tensioning equipment and the locking equipment according to the normal working sequence, and performing tensioning and locking work on the steel strand after an anchorage device system is formed;
s2, screwing the support nut until the steel strand is in a state within a control stress range, and standing for 3-5 min;
s3, holding the jack in a loaded state, and enabling the piston to push the second anchor cup to move upwards by the distance A;
s4, after the locking cover is screwed until the locking cover is attached to the upper end face of the cylinder body and the jack is normally unloaded, reading a dial indicator at the moment and counting as B, wherein A-B is the retraction amount of the prestress;
and S5, after the requirement is met, removing the dial indicator and then grouting and sealing the anchor.
Compared with the prior art, the invention can obtain the following technical effects:
1. the invention is provided with a tensioning device and a locking device, a support nut in the tensioning device tensions a steel strand to a controlled stress range, so as to prevent a virtual position from influencing a tensioning effect when a jack is used, then a piston of the jack pushes a second anchor cup and a second clamping piece to drive the steel strand to move upwards to a design requirement, and at the moment, the jack is unloaded after a locking cover in the locking device is adjusted to the upper end surface of a cylinder body, so that the top of the cylinder body is locked, the operation is more convenient, the precision is more accurate, and the whole tensioning task can be completed only by sequentially tensioning, so that the tensioning device is efficient and rapid.
2. The invention is provided with the clamping sleeve, and the resistance between the steel strand and the piston can be increased by utilizing the clamping sleeve, so that the phenomenon that the tensioning effect is influenced by loosening is prevented.
3. In the invention, the locking cover is internally provided with the pawl and the ratchet wheel outside the second anchor cup, and the locking cover is unidirectionally driven and reversely locked by utilizing the matching of the ratchet wheel and the pawl, so that the locking effect after stretching is prevented from being influenced by loosening, and the function of low retraction limitation is ensured. And meanwhile, the effect of always matching the ratchet wheel and the pawl is realized under the action of the spring and the extrusion of the locking cover.
4. According to the invention, the cover plate is arranged on the locking cover, the dial indicator is arranged on the cover plate, the tensile length of the steel strand after the jack is unloaded is accurately measured by using the dial indicator, and the tensioning effect is further judged.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a view showing the connection between the pawl inside the locking cap and the ratchet wheel outside the second anchor cup in accordance with the present invention.
In the figure: 1. steel strand wires; 2. a nut backing plate; 3. a support nut; 4. a first anchor cup; 5. a first clip piece; 6. a cylinder body; 7. a piston; 8. extruding the block; 9. a locking cover; 10. a second anchor cup; 11. a second clip; 12. a clamping sleeve; 13. mounting grooves; 14. a pawl; 15. a ratchet wheel; 16. a male member; 17. a chute; 18. a spring; 19. a cover plate; 20. and (5) a dial indicator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in fig. 1 to 3, a low back prestressing tendons ground tackle system that contracts, including steel strand wires 1, stretch-draw equipment and locking equipment, stretch-draw equipment includes nut backing plate 2, support nut 3, first anchor cup 4 and jack, nut backing plate 2 is the outside that cavity setting just is located steel strand wires 1, support nut 3 sets up the top at nut backing plate 2, 4 threaded connection in the outside of support nut 3 of first anchor cup, evenly set up a plurality of first through-hole that is used for running through steel strand wires 1 on the first anchor cup 4, be equipped with conical first clamping piece 5 in the first through-hole, through adjusting support nut 3 with first anchor cup 4 and first clamping piece 5 drive steel strand wires 1 and shift up the state that is in the control stress within range, prevent the virtual position. The jack comprises a cylinder body 6 and a piston 7, the piston 7 is located inside the cylinder body 6 and sleeved on the outer side of the steel strand 1, an extrusion block 8 is arranged between the cylinder body 6 and the first anchor cup 4, and the tensioning equipment is moved upwards to a design requirement by the jack. Locking equipment sets up in the top of jack, and locking equipment includes locking lid 9, second anchor cup 10 and second clamping piece 11, and locking lid 9 threaded connection has evenly seted up the coaxial second through-hole with first through-hole in the outside of second anchor cup 10, is equipped with conical second clamping piece 11 in the second through-hole on the second anchor cup 10. When the piston of the jack jacks the second anchor cup 10 to the designed height, the second anchor cup 10 and the second clamping piece 11 drive the steel strand 1 to move upwards in the process, the locking cover 9 is adjusted to be attached to the upper end face of the cylinder body 6, the top of the cylinder body is locked, the operation is more convenient, the precision is more accurate, the whole tensioning task can be completed only by sequentially tensioning, the jack is efficient and rapid, and the jack is unloaded.
Preferably, the outer side of the steel strand 1 positioned on the inner side of the piston 7 is fixedly connected with the clamping sleeve 12, the clamping sleeve 12 is in interference fit with the inner wall of the piston 7, the acting force of the steel strand 1 during upward movement and tensioning is increased, and the phenomenon that the ground slips due to overlarge tension force to influence the tensioning quality is prevented.
In the technical scheme, preferably, the bottom side end of the locking cover 9 is provided with a mounting groove 13, a pawl 14 is arranged in the mounting groove 13, the outer side of the second anchor cup 10 is provided with a ratchet wheel 15 matched with the pawl 14, the inner wall of the ratchet wheel 15 is provided with a convex piece 16, the bottom side end of the second anchor cup 10 is provided with a sliding groove 17 for mounting the convex piece 16, a spring 18 is arranged in the sliding groove 17, one end of the spring 18 is connected with the convex piece 16, and the other end of the spring 18 is connected with the piston 7. The locking cap 9 is prevented from being released between the second anchor cup 10 by the one-way rotation and reverse locking function of the pawl 15 and ratchet 15.
In the present technical solution, preferably, the top of the locking cover 9 is provided with a cover plate 19, a dial indicator 20 is installed at the center of the cover plate 19, and a probe of the dial indicator 20 extends to the upper surface of the second anchor cup 10. And measuring the stretching length of the steel strand 1 unloaded by the jack by using a dial indicator 20 on the cover plate 19 so as to judge the stretching quality.
In the technical scheme, the distance from the cover plate 19 to the cylinder body 6 is preferably 10-15 mm larger than the distance from the end face of the steel strand 1 positioned on the inner side of the locking cover 9 to the upper surface of the piston 7, and preferably 10mm is used, so that the end face of the steel strand 1 is prevented from touching the cover plate 19 to be accurately measured.
In the technical scheme, preferably, the top part of the extrusion block 8 is partially nested in the cylinder body 6, the bottom part of the extrusion block 8 is arranged in a concave shape, and is partially nested outside the first anchor cup 4, so that the installation of each part is convenient, and the influence of deviation on the measurement and tensioning quality in the process is prevented.
Preferably in this technical scheme, be equipped with slip casting hole and exhaust hole in first anchor cup 4, and the slip casting hole is located the inboard of the well kenozooecium of nut backing plate 2, is convenient for carry out slip casting and exhaust effect in the pipeline, prevents that the cavity from appearing and influencing construction quality.
Example 2:
the invention also discloses a use method of the low-retraction prestressed tendon anchor system, which comprises the following steps,
s1, installing the steel strand 1, tensioning equipment and locking equipment according to a normal working sequence, and performing tensioning and locking work on the steel strand 1 after an anchorage device system is formed;
s2, screwing the support nut 3 until the steel strand 1 is in a state within a control stress range, and standing for 3 min;
s3, holding the jack in a loaded state, and enabling the piston 7 to push the second anchor cup 10 to move upwards by the distance A;
s4, after the locking cover 9 is screwed to be attached to the upper end face of the cylinder body 6, reverse locking is achieved under the action of the ratchet wheel 15 and the pawl 14, the locking effect is enhanced, after the jack is normally unloaded, the reading of the dial indicator 20 at the moment is read and counted as B, and A-B is the retraction amount of the prestress;
and S5, after the requirement is met, removing the dial indicator 20 and then grouting and sealing the anchor.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a low prestressing tendons ground tackle system that contracts, includes steel strand wires (1), stretch-draw equipment and locking equipment, a serial communication port, stretch-draw equipment includes nut backing plate (2), support nut (3), first anchor cup (4) and jack, nut backing plate (2) set up and are located the outside of steel strand wires (1) for cavity, support nut (3) set up the top at nut backing plate (2), first anchor cup (4) threaded connection is in the outside of support nut (3), evenly set up the first through-hole that a plurality of is used for running through steel strand wires (1) on first anchor cup (4), be equipped with conical first clamping piece (5) in the first through-hole, the jack includes cylinder body (6) and piston (7), piston (7) are located cylinder body (6) inside and run through the outside at steel strand wires (1), be equipped with between cylinder body (6) and first anchor cup (4) and extrude piece (8), locking equipment sets up in the top of jack, locking equipment includes locking lid (9), second anchor cup (10) and second clamping piece (11), locking lid (9) threaded connection is in the outside of second anchor cup (10), evenly set up the second through-hole coaxial with first through-hole on second anchor cup (10), be equipped with conical second clamping piece (11) in the second through-hole.
2. The anchor system of the low-retraction prestressed tendon as claimed in claim 1, wherein a clamping sleeve (12) is fixedly connected to the outer side of the steel strand (1) located inside the piston (7), and the clamping sleeve (12) is in interference fit with the inner wall of the piston (7).
3. The low-retraction prestressed tendon anchor system according to claim 1, wherein a mounting groove (13) is formed in the bottom side end of the locking cover (9), a pawl (14) is arranged in the mounting groove (13), a ratchet wheel (15) matched with the pawl (14) is arranged on the outer side of the second anchor cup (10), a convex member (16) is arranged on the inner wall of the ratchet wheel (15), a sliding groove (17) for mounting the convex member (16) is formed in the bottom side end of the second anchor cup (10), a spring (18) is arranged in the sliding groove (17), one end of the spring (18) is connected with the convex member (16), and the other end of the spring (18) is connected with the piston (7).
4. The anchor system of the low-retraction prestressed tendon as claimed in claim 1, wherein a cover plate (19) is arranged on the top of the locking cover (9), a dial indicator (20) is installed in the center of the cover plate (19), and a probe of the dial indicator (20) extends to the upper surface of the second anchor cup (10).
5. The anchor system of claim 4, wherein the distance from the cover plate (19) to the cylinder (6) is 10-15 mm greater than the distance from the end face of the steel strand (1) located inside the locking cover (9) to the upper surface of the piston (7).
6. A low retraction tendon anchor system as claimed in claim 1 wherein the top of the squeeze block (8) is partially nested within the cylinder (6) and the bottom of the squeeze block (8) is concave and partially nested outside the first anchor cup (4).
7. A low recoil pre-stressed tendon anchor system as claimed in claim 1, wherein the first anchor cup (4) is provided with a grouting hole and an exhaust hole therein.
8. A method of using a low retraction tendon anchor system as claimed in any one of claims 1 to 7 including the steps of,
s1, installing the steel strand (1), tensioning equipment and locking equipment according to a normal working sequence, and performing tensioning and locking work on the steel strand (1) after an anchorage device system is formed;
s2, screwing the support nut (3) until the steel strand (1) is in a state of controlling the stress range, and standing for 3-5 min;
s3, holding the jack in a loaded state, and enabling the piston (7) to push the second anchor cup (10) to move upwards by the distance A;
s4, screwing the locking cover (9) until the locking cover is attached to the upper end face of the cylinder body (6), unloading the jack normally, reading a reading of the dial indicator (20) at the moment and counting as B, wherein A-B is the retraction amount of the prestress;
and S5, after the requirement is met, removing the dial indicator (20) and grouting and sealing the anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968105.9A CN110593489B (en) | 2019-10-12 | 2019-10-12 | Low-retraction prestressed tendon anchorage device system and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910968105.9A CN110593489B (en) | 2019-10-12 | 2019-10-12 | Low-retraction prestressed tendon anchorage device system and use method thereof |
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| Publication Number | Publication Date |
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| CN110593489A true CN110593489A (en) | 2019-12-20 |
| CN110593489B CN110593489B (en) | 2023-11-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173293A (en) * | 2019-12-31 | 2020-05-19 | 中建交通建设集团有限公司 | Manual reset type prestressed tendon low-retraction tensioning anchoring device and construction method |
| CN112252201A (en) * | 2020-11-30 | 2021-01-22 | 中铁建大桥工程局集团第五工程有限公司 | Prestressed anchorage utensil is used in bridge construction |
| CN114575619A (en) * | 2022-04-13 | 2022-06-03 | 安徽恩达建筑工程有限公司 | Frame beam prestress reinforcing device and construction method thereof |
| CN114738024A (en) * | 2022-05-20 | 2022-07-12 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
| CN115653338A (en) * | 2022-10-14 | 2023-01-31 | 重庆科技学院 | CFRP panel-SMA silk combined anchorage device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111173293A (en) * | 2019-12-31 | 2020-05-19 | 中建交通建设集团有限公司 | Manual reset type prestressed tendon low-retraction tensioning anchoring device and construction method |
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| CN114738024A (en) * | 2022-05-20 | 2022-07-12 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
| CN114738024B (en) * | 2022-05-20 | 2022-08-19 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
| CN115653338A (en) * | 2022-10-14 | 2023-01-31 | 重庆科技学院 | CFRP panel-SMA silk combined anchorage device |
| CN115653338B (en) * | 2022-10-14 | 2024-05-17 | 重庆科技学院 | Combined anchorage device of CFRP plate-SMA wire composite material |
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| CN110593489B (en) | 2023-11-21 |
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