CN110593489B - Low-retraction prestressed tendon anchorage device system and use method thereof - Google Patents
Low-retraction prestressed tendon anchorage device system and use method thereof Download PDFInfo
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- CN110593489B CN110593489B CN201910968105.9A CN201910968105A CN110593489B CN 110593489 B CN110593489 B CN 110593489B CN 201910968105 A CN201910968105 A CN 201910968105A CN 110593489 B CN110593489 B CN 110593489B
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- anchor cup
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- steel strand
- anchor
- piston
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- 210000002435 tendon Anatomy 0.000 title claims abstract description 15
- 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
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000000523 sample Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 101150038956 cup-4 gene Proteins 0.000 description 7
- 239000011513 prestressed concrete Substances 0.000 description 6
- 238000007569 slipcasting Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002787 reinforcement 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 use method thereof, and belongs to the field of prestressed tendon anchors. The device comprises a steel strand, tensioning equipment and locking equipment, wherein a first anchor cup is lifted to a certain height to realize that the control stress is in a design range when a supporting nut in the tensioning equipment is used for adjusting, a jack is loaded to enable a piston to push a second anchor cup to lift to the design requirement, the steel strand is kept in an effective tensioning state, and the tensioning state of the steel strand and the function of controlling the low retraction of the steel strand are guaranteed by adjusting a locking cover to the upper end face of a cylinder body when the jack is normally unloaded. The ratchet wheel outside the pawl and the second anchor cup inside the locking cover achieves the effect of unidirectional transmission reverse locking, and relaxation caused by stress loss in the later period 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 applies pre-stressing force.
Background
Before the engineering structural member bears external load, pre-stressing is applied to the steel strands in the tension module, so that 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 terms of mechanical structure, the mechanical structure means that stress is generated in advance, and the mechanical structure has the advantages that the rigidity of the structure can be improved, vibration and elastic deformation are reduced, so that the elastic strength of the tension module can be obviously improved, and the original resistance is stronger.
The bridge span structure is a bridge built by prestressed concrete. The bridge uses the counterforce of pretension of steel bars or steel wires to make the concrete be pressed in advance before loading. No tensile stress occurs during the operation phase (known as fully prestressed concrete), or there is a tensile stress without cracking or controlling cracking within the allowable width (known as partially prestressed concrete). The prestressed concrete bridge is developed in the 30 s of the 20 th century, and has been developed greatly in the 50 s, the main span is 90 m, the prestressed concrete bridge is now dominant in the middle and small spans, and the prestressed concrete bridge is in strong competition with the steel bridge in the large span. In the construction process, certain prestress loss can be generated due to various reasons, and the prestress loss refers to the difference value between effective prestress and tension control stress actually existing in a prestress steel bar or steel material in a prestress concrete structure and a prestress steel structure. The existing prestressed reinforcement or steel controls stress during tensioning, and the traditional method of adopting an anchor cup and supporting nut combination to tension for two times has the defects of insufficient stability and influence of external multiple factors, so that the prestress value is gradually lost in the tensioning period and later stages, and the occurrence of cracks is accelerated. Simultaneously jack and the supporting nut stretch-draw jointly that traditional mode used, because jack extrusion anchor cup and supporting nut, resistance can increase when adjusting the supporting nut this moment and be inconvenient for adjust and even can adjust, jack and supporting nut's interval will change, prestressing force at this moment will change, can not reach preset effect.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a low-retraction prestressed tendon anchor system and a use method thereof.
In order to achieve the above purpose, the present invention adopts the following scheme:
the utility model provides a low prestressing tendons ground tackle system that contracts, includes steel strand wires, stretch-draw equipment and locking equipment, stretch-draw equipment includes nut backing plate, back nut, first anchor cup and jack, the nut backing plate is the cavity setting and is located the outside of steel strand wires, back nut sets up the top at the nut backing plate, first anchor cup threaded connection is in the outside of back nut, evenly offered a plurality of on the first anchor cup and be used for running through the first through-hole of steel strand wires, be equipped with conical first clamping piece in the first through-hole, the jack includes cylinder body and piston, the piston is located the cylinder body inside and runs through in the outside of steel strand wires, be equipped with the extrusion piece between cylinder body and the first anchor cup, locking equipment sets up in the top of jack, locking equipment includes locking lid, second anchor cup and second clamping piece, locking lid threaded connection is in the outside of second anchor cup, evenly offered on the second anchor cup with first through-hole coaxial second clamping piece, be equipped with conical second clamping piece in the second through-hole.
Further, the outside fixedly connected with clamping sleeve that is located the inboard steel strand wires of piston, clamping sleeve and the inner wall interference fit of piston.
Further, the mounting groove is formed in the bottom side end of the locking cover, a pawl is arranged in the mounting groove, a ratchet matched with the pawl is arranged on the outer side of the second anchor cup, a convex part is arranged on the inner wall of the ratchet, a sliding groove for mounting the convex part 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 part, and the other end of the spring is connected with the piston.
Further, the top of locking lid is equipped with the apron, the amesdial is installed at the center of apron, the probe of amesdial extends to on the second anchor cup upper surface.
Further, the distance from the cover plate to the cylinder body is 10 mm-15 mm greater than the distance from the end face of the steel strand positioned at the inner side of the locking cover to the upper surface of the piston.
Further, the top part of the extrusion block is partially nested in the cylinder body, and the bottom of the extrusion block is concavely arranged and partially nested outside the first anchor cup.
Further, grouting holes and exhaust holes 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 steel strands, tensioning equipment and locking equipment according to a normal working sequence, and tensioning and locking the steel strands after an anchor system is formed;
s2, screwing the supporting nut until the steel strand is in a state of controlling the stress range, and then stopping for 3-5 min;
s3, carrying load on the jack, and pushing the second anchor cup to move upwards by the piston by the distance A;
s4, after the locking cover is screwed to be attached to the upper end face of the cylinder body, the jack is normally unloaded, and then a dial indicator reading gauge at the moment is read as B, wherein A-B is the retraction amount of the prestress;
s5, after meeting the requirements, removing the dial indicator and grouting to seal the anchor.
Compared with the prior art, the invention can obtain the following technical effects:
1. the tensioning device and the locking device are arranged in the invention, the support nut in the tensioning device tightens the steel strand to the control stress range, the tensioning effect is prevented from being influenced by the virtual position when the jack is used, then the piston of the jack pushes the second anchor cup and the second clamping piece to drive the steel strand to move up to the design requirement, at the moment, the jack is unloaded after the locking cover in the locking device is adjusted to the upper end face of the cylinder body, so that the top of the jack is locked, the operation is more convenient, the precision is more accurate, and the whole tensioning task can be completed only by tensioning sequentially, thereby being efficient and quick.
2. The clamping sleeve is arranged in the invention, and the resistance between the steel strand and the piston can be increased by using the clamping sleeve, so that the tension effect is prevented from being influenced by loosening.
3. The ratchet wheel and the ratchet wheel at the outer side of the second anchor cup are arranged in the locking cover, the locking cover is reversely locked in a one-way transmission way by utilizing the cooperation of the ratchet wheel and the ratchet wheel, the locking effect after the stretching is influenced by loosening is avoided, and the function of low retraction limitation is ensured. Meanwhile, the effect of always matching the ratchet and the pawl is realized under the action of the spring and the extrusion of the locking cover.
4. According to the invention, the locking cover is provided with the cover plate, the cover plate is provided with the dial indicator, and the stretching length of the steel strand after unloading of the jack is accurately measured by using the dial indicator, so that the stretching effect is judged.
Drawings
FIG. 1 is a schematic diagram 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 diagram showing the relationship between the pawl in the locking cap and the ratchet wheel on the outside of the second anchor cup in the present invention.
In the figure: 1. steel strand; 2. a nut backing plate; 3. a support nut; 4. a first anchor cup; 5. a first clip; 6. a cylinder; 7. a piston; 8. extruding a block; 9. a locking cover; 10. a second anchor cup; 11. a second clip; 12. a clamping sleeve; 13. a mounting groove; 14. a pawl; 15. a ratchet wheel; 16. a male member; 17. a chute; 18. a spring; 19. a cover plate; 20. dial gauge.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1:
as shown in fig. 1 to 3, a low-retraction prestressed tendon anchorage system comprises a steel strand 1, tensioning equipment and locking equipment, wherein the tensioning equipment comprises a nut base plate 2, a supporting nut 3, a first anchor cup 4 and a jack, the nut base plate 2 is arranged in a hollow mode and is located on the outer side of the steel strand 1, the supporting nut 3 is arranged above the nut base plate 2, the first anchor cup 4 is in threaded connection with the outer side of the supporting nut 3, a plurality of first through holes used for penetrating the steel strand 1 are uniformly formed in the first anchor cup 4, conical first clamping pieces 5 are arranged in the first through holes, the supporting nut 3 is adjusted to enable the first anchor cup 4 and the first clamping pieces 5 to drive the steel strand 1 to move upwards to be in a state within a control stress range, and virtual positions are prevented. The jack includes cylinder body 6 and piston 7, and piston 7 is located the inside and the cover of cylinder body 6 establishes in the outside of steel strand wires 1, is equipped with extrusion piece 8 between cylinder body 6 and the first anchor cup 4, utilizes the jack to shift up the tensioning equipment to the design requirement department. The 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 is in the outside of second anchor cup 10, evenly has seted up the second through-hole coaxial with first through-hole on the second anchor cup 10, is equipped with conical second clamping piece 11 in the second through-hole. When the piston of the jack lifts 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, and the locking cover 9 is adjusted to be attached to the upper end face of the cylinder body 6, so that the top of the jack is locked, the operation is more convenient, the precision is more accurate, and the whole tensioning task can be completed only by tensioning in sequence, so that the jack is efficient and quick, and the jack is unloaded afterwards.
In this technical scheme, preferably, the outside fixedly connected with clamping sleeve 12 of the steel strand wires 1 that is located the inboard of piston 7, clamping sleeve 12 and the inner wall interference fit of piston 7 increase steel strand wires 1 and move the effort when taut upward, prevent that the pulling force from appearing too big and leading to the ground slippage, influence stretch-draw quality.
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, a ratchet wheel 15 matched with the pawl 14 is arranged on the outer side of the second anchor cup 10, a convex piece 16 is arranged on the inner wall of the ratchet wheel 15, a chute 17 for mounting the convex piece 16 is arranged at the bottom side end of the second anchor cup 10, a spring 18 is arranged in the chute 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 coming loose between the second anchor cup 10 by the function of unidirectional rotation and reverse locking of the pawl 15 and the ratchet 15.
In this technical solution, preferably, the top of the locking cover 9 is provided with a cover plate 19, the center of the cover plate 19 is provided with a dial gauge 20, and the probe of the dial gauge 20 extends to the upper surface of the second anchor cup 10. And the stretching length of the steel strand 1 after unloading is measured by using a dial indicator 20 on the cover plate 19, so that the stretching quality is judged.
In the technical scheme, the distance from the cover plate 19 to the cylinder body 6 is preferably 10 mm-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 enable accurate measurement.
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 concavely arranged and partially nested outside the first anchor cup 4, so that each part is convenient to install, and the deviation in the process is prevented from influencing the measurement and tensioning quality.
In this technical scheme, preferably, be equipped with slip casting hole and exhaust hole in the first anchor cup 4, and the inboard of the cavity of nut backing plate 2 is located to the slip casting hole, is convenient for carry out the slip casting in the pipeline and exhaust effect, prevents that the cavity from influencing construction quality from appearing.
Example 2:
the invention also discloses a use method of the low-retraction prestressed tendon anchor system, which comprises the following steps,
s1, installing a steel strand 1, tensioning equipment and locking equipment according to a normal working sequence, and tensioning and locking the steel strand 1 after an anchor system is formed;
s2, screwing the support nut 3 until the steel strand 1 is in a state of controlling the stress range, and then stopping for 3 minutes;
s3, carrying load on the jack, and pushing the second anchor cup 10 to move upwards by the piston 7 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 the A-B is the retraction amount of the prestress;
s5, after the requirements are met, removing the dial gauge 20, and grouting to seal 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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. A low-retraction prestressed tendon anchorage system comprises a steel strand (1), tensioning equipment and locking equipment, it is characterized in that the tensioning equipment comprises a nut backing plate (2), a supporting nut (3), a first anchor cup (4) and a jack, the nut backing plate (2) is arranged in a hollow way and is positioned at the outer side of the steel strand (1), the supporting nut (3) is arranged above the nut backing plate (2), the first anchor cup (4) is connected with the outer side of the supporting nut (3) in a threaded manner, a plurality of first through holes for penetrating the steel strand (1) are uniformly formed in the first anchor cup (4), a conical first clamping piece (5) is arranged in the first through hole, the jack comprises a cylinder body (6) and a piston (7), the piston (7) is positioned in the cylinder body (6) and penetrates through 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), the locking device is arranged above the jack and comprises a locking cover (9), a second anchor cup (10) and a second clamping piece (11), the locking cover (9) is connected with the outer side of the second anchor cup (10) in a threaded manner, a second through hole coaxial with the first through hole is uniformly formed in the second anchor cup (10), and a conical second clamping piece (11) is arranged in the second through hole;
the locking device is characterized in that 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 piece (16) is arranged on the inner wall of the ratchet wheel (15), a sliding groove (17) for mounting the convex piece (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 piece (16), and the other end of the spring (18) is connected with the piston (7);
the top of locking lid (9) is equipped with apron (19), amesdial (20) are installed at the center of apron (19), the probe of amesdial (20) extends to on second anchor cup (10) upper surface.
2. A low-retraction tendon anchor system according to claim 1, characterized in that the outer side of the steel strand (1) located inside the piston (7) is fixedly connected with a clamping sleeve (12), said clamping sleeve (12) being in interference fit with the inner wall of the piston (7).
3. A low-retraction tendon anchor system according to claim 2, characterised in that 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 strand (1) located inside the locking cap (9) to the upper surface of the piston (7).
4. A low retraction tendon anchor system according to claim 3, characterised in that the top portion of the extrusion block (8) is partially nested within the cylinder (6), the bottom portion of the extrusion block (8) being concavely disposed and partially nested outside the first anchor cup (4).
5. A low retraction tendon anchor system according to claim 4, wherein grouting and vent holes are provided in the first anchor cup (4).
6. The method of claim 5, comprising the step of,
s1, installing a steel strand (1), tensioning equipment and locking equipment according to a normal working sequence, and tensioning and locking the steel strand (1) after an anchor system is formed;
s2, screwing the support nut (3) until the steel strand (1) is in a state of controlling the stress range, and then stopping for 3-5 min;
s3, carrying load on the jack, and pushing the second anchor cup (10) to move upwards by the piston (7) 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), after the jack is normally unloaded, reading a dial indicator (20) at the moment and counting as B, wherein the value of A minus the value of B is the retraction amount of the prestress;
s5, after meeting the requirements, removing the dial gauge (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 CN110593489A (en) | 2019-12-20 |
| CN110593489B true CN110593489B (en) | 2023-11-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN112252201B (en) * | 2020-11-30 | 2022-07-19 | 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 |
| CN114575619B (en) * | 2022-04-13 | 2023-08-29 | 安徽恩达建筑工程有限公司 | Frame beam prestress reinforcing device and construction method thereof |
| CN114738024B (en) * | 2022-05-20 | 2022-08-19 | 中国矿业大学(北京) | Anchor cable prestress control device and using method |
| 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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| CN2102324U (en) * | 1990-06-11 | 1992-04-22 | 柳州市建筑机械总厂 | Prestress tensile ground tackle of steel twisted cable |
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