CN217637731U

CN217637731U - Detection apparatus for effective stress under anchor

Info

Publication number: CN217637731U
Application number: CN202221578278.3U
Authority: CN
Inventors: 张华为; 曾俊; 徐汀浩
Original assignee: Zheshang Testing Group Co ltd
Current assignee: Zheshang Testing Group Co ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2022-10-21
Anticipated expiration: 2032-06-22

Abstract

A detection device for effective stress under an anchor comprises a plurality of steel strands at least partially inserted into a concrete beam, a working anchor cable assembly, a counter-force cylinder, spiral ribs positioned on the periphery of the counter-force cylinder, a jack acting on the counter-force cylinder, a stress tester, a tool anchor cable assembly and an oil pump for driving the jack, wherein the working anchor cable assembly is sequentially sleeved on the steel strands from inside to outside; a transition clapboard is arranged between the working anchor cable component and the counter-force cylinder; one end of the transition partition plate is provided with a groove, and the working anchor cable assembly is at least partially embedded into the groove; the other end of the transition partition plate is provided with a flange, and the flange is inserted into the reaction cylinder and is propped against the inner wall of the reaction cylinder. The utility model discloses a transition baffle's setting can be stabilized more and install a work anchor rope subassembly and a counter-force section of thick bamboo, adapts to different unevenness's surface for the contact surface is difficult for changing, can be so that the strength direction of transfer at both ends is more stable, and consequently the testing result is more accurate, reliable.

Description

Detection apparatus for effective stress under anchor

Technical Field

The utility model belongs to the technical field of the technique of prestressing force engineering test among the building trade and specifically relates to a detection device of effective stress under anchor.

Background

The prestressed engineering belongs to concealed engineering in the aspect of effective prestress under the anchor, and is difficult to specify each prestressed index under the anchor in the construction process for a long time, so that the magnitude of the locking force after the tension is released is not known, and the friction between the pipeline and the anchorage device in the tension process cannot be known, so that the construction quality is difficult to ensure. The system mainly detects the anchoring quality after prestress tensioning construction.

The safe construction steps of the prestressed bridge body are generally divided into three stages, 1, pouring prestressed beam concrete, and reserving a pore channel for the prestressed reinforcement to pass through; 2. installing a detection device and tensioning the prestressed tendons; 3. cutting redundant prestressed tendons, sealing anchors and grouting pore canals. Wherein the tensioning quality of the prestressed tendons in the 2 nd stage directly influences the service life of the bridge. The tension stress and the elongation value of the prestressed tendon are two most important control indexes of the tension quality of the prestressed tendon, and if the control is improper, the tension stress loss is easy to occur to cause under tension or over tension, so that the use effect and the service life of a prestressed concrete member are influenced.

Because the equal uneven unanimity of surface texture of every concrete piece that awaits measuring has certain unsmooth phenomenon more or less, leads to work anchor rope subassembly and reaction section of thick bamboo after the assembly, and the size of contact surface between them changes, and then leads to the tensile of steel strand wires and jack all to arouse the error to produce, and data is not accurate enough.

Disclosure of Invention

In order to overcome the above-mentioned not enough of prior art, the utility model provides a detection device of effective stress under anchor.

The technical proposal of the utility model for solving the technical problem is that: a detection device for effective stress under an anchor comprises a plurality of steel strands at least partially inserted into a concrete beam, a working anchor cable assembly, a counter-force cylinder, spiral ribs positioned on the periphery of the counter-force cylinder, a jack acting on the counter-force cylinder, a stress tester, a tool anchor cable assembly and an oil pump for driving the jack, wherein the working anchor cable assembly is sequentially sleeved on the steel strands from inside to outside; a transition clapboard is arranged between the working anchor cable component and the counter-force cylinder; one end of the transition partition plate is provided with a groove, and at least part of the working anchor cable assembly is embedded into the groove; the other end of the transition partition plate is provided with a flange, and the flange is inserted into the reaction cylinder and is abutted against the inner wall of the reaction cylinder.

The technical scheme is further characterized by further comprising a plurality of bundling wire frames, wherein through holes corresponding to the steel strands one by one are formed in the bundling wire frames, grouting pipes penetrate through the centers of the bundling wire frames, and the front ends of the grouting pipes extend into the concrete beam.

The working anchor cable assembly comprises a sleeve body and an expansion sleeve, wherein the sleeve body is provided with a plurality of accommodating through holes, the expansion sleeve is embedded in the accommodating through holes, and the steel strand penetrates through the expansion sleeve so that the expansion sleeve is tightly attached to the steel strand and the inner wall of the accommodating through hole respectively.

The expansion casing is an inverted cone-shaped elastic body and consists of a first half casing and a second half casing, and an adjusting gap is formed between the first half casing and the second half casing.

In the above technical solution, the jack is a through-type jack, and the through-type jack includes an outer cylinder, an inner cylinder having an opening and movably disposed in the outer cylinder, and a piston rod acting on the inner cylinder.

Further set up to about above-mentioned technical scheme, the front end of inner cylinder body is equipped with first magnetism and inhales the piece, the rear end of reaction cylinder is equipped with the second magnetism and inhales the piece, first magnetism inhale the piece can inhale the piece with second magnetism and adsorb each other to make the front end of jack support and lean on reaction cylinder on.

The above technical means is further provided that the passage holes of the wire harness frame are composed of a plurality of circular passage holes at the inner ring and a semicircular passage hole at the outer periphery.

The technical scheme is further characterized in that an anti-falling cap is further sleeved at the tail end of the steel strand, and the anti-falling cap can abut against the stress tester and form limiting anti-falling fit.

The anti-falling cap is further provided with a self-clamping mechanism for clamping the steel strand.

Further setting to about above-mentioned technical scheme is that the anticreep cap seted up the jack, the inner wall of jack is equipped with an annular groove, self-clamping mechanism include that a plurality of ring establishes the centre gripping piece in the annular groove and connect the spring between centre gripping piece and annular groove, each the centre gripping piece between form the centre gripping space.

The utility model discloses detection method during the use does: the detection device is arranged on the exposed steel strand, and accessories such as a jack, a stress tester and the like are arranged between the working anchor cable assembly and the tool anchor cable assembly. During testing, the steel strand is tensioned through the jack, and when the counter-tension force is small rain and the original prestress is applied, the device has fastening force on the steel strand, so that displacement does not occur; when the counter-pulling force is larger than the original prestress, the counter-force cylinder on the detection device is stretched together with the steel strand, and the displacement of the counter-force cylinder is increased sharply at the moment, so that the effective prestress can be judged through the displacement trend and the data fed back by the stress tester.

The beneficial effects of the utility model reside in that: through transition baffle's setting, can be more stable must install work anchor rope subassembly and a counter-force section of thick bamboo, can adapt to different unevenness's surface, and then make the difficult change of contact surface, can make the strength direction of transfer at both ends more stable, so the testing result is more accurate, reliable.

Drawings

Fig. 1 is an exploded schematic view of the present invention.

Fig. 2 is a schematic view of the assembly of the present invention.

Fig. 3 is a partial sectional view of the present invention.

Fig. 4 is a schematic structural diagram of the jack of the present invention.

FIG. 5 is a schematic structural view of a wire-bundling frame in the second embodiment.

Fig. 6 is an enlarged schematic view of a third embodiment of a work cable bolt assembly.

FIG. 7 is a schematic diagram of the separation in the fourth embodiment.

FIG. 8 is a sectional view of the detachment prevention cap of the fifth embodiment.

In the figure: 1. steel strand wires; 2. a concrete beam; 3. working the anchor cable assembly; 4. a counter-force cylinder; 5. a spiral rib; 6. a jack; 7. a stress tester; 8. a tool anchor cable assembly; 9. a transition barrier; 10. a groove; 11. a flange; 12. a sleeve body; 13. an accommodating through hole; 14. expanding the casing; 15. a first half casing; 16. a second half-sleeve; 17. adjusting the clearance; 18. a wire bundling frame; 19. grouting pipes; 20. a circular through hole; 21. the semicircle passes through the hole; 22. an outer cylinder body; 23. an inner cylinder body; 24. a piston rod; 25. a first magnetic attraction sheet; 26. a second magnetic attraction sheet; 27. an anti-drop cap; 28. a jack; 29. an annular groove; 30. a clamping piece; 31. a spring; 32. and (4) clamping the space.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example one

Referring to fig. 1 to 4, a device for detecting effective stress under an anchor comprises a plurality of steel strands 1 at least partially inserted into a concrete beam 2, a working anchor cable assembly 3 sleeved on the steel strands 1 from inside to outside in sequence, a reaction cylinder 4, a spiral rib 5 positioned on the periphery of the reaction cylinder 4, a jack 6 acting on the reaction cylinder 4, a stress tester 7, a tool anchor cable assembly 8, and an oil pump (not shown in the figure) for driving the jack 6; a transition partition plate 9 is also arranged between the working anchor cable component 3 and the reaction cylinder 4; one end of the transition partition plate 9 is provided with a groove 10, and the working anchor cable assembly 3 is at least partially embedded into the groove 10; the other end of the transition partition plate 9 is provided with a flange 11, and the flange 11 is inserted into the reaction cylinder 4 and is abutted against the inner wall of the reaction cylinder 4.

The preferable structure scheme of the working anchor cable assembly 3 is that the working anchor cable assembly 3 comprises a sleeve body 12 provided with a plurality of accommodating through holes 13 and an expansion sleeve 14 embedded in the accommodating through holes 13, and the steel strand 1 passes through the expansion sleeve 14, so that the expansion sleeve 14 is respectively attached to the inner walls of the steel strand 1 and the accommodating through holes 13, and the working anchor cable assembly 3 and the steel strand 1 are prevented from slipping off from each other.

Similarly, the specific composition of the tool cable assembly 8 is substantially identical to that of the working cable assembly 3, and is not particularly limited herein.

Example two

During the process of building the steel strand 1, due to various reasons, certain deformation and bending may occur on the one hand, and the intervals among the steel strand 1 are different on the other hand, so that the subsequent reaction cylinder 4 and the jack 6 cannot be uniformly and normally sleeved on the steel strand. In order to eliminate the above defects, in some embodiments, referring to fig. 5, a plurality of bunching frames 18 are further included, through holes corresponding to the steel strands 1 one to one are formed in the bunching frames 18, a grouting pipe 19 is further inserted into the center of the bunching frame 18, and a front end of the grouting pipe 19 extends into the concrete beam 2. Through the arrangement of the wire bundling frame 18, the steel strands 1 can penetrate through the through holes to exert acting force on the steel strands 1, so that the steel strands 1 are combed according to the through holes, and the arrangement of the steel strands 1 is tidy and standard.

Because the steel strand 1 is made of metal, and when the size is larger, the steel strand is not easy to bend and finish greatly. Preferably, the through holes of the wire harness frame 18 consist of a plurality of circular through holes 20 at the inner circle and semicircular through holes 21 at the outer periphery. During the use, originally, the steel strand 1 of inwards deforming can wear to establish in inboard circular through hole 20, originally the steel strand 1 of outwards deforming can wear to establish in the semicircle through hole 21 in the outside to can make each steel strand 1 more regular pass through bundle line frame 18 under the condition of the form of steel strand 1 as far as possible reduction.

EXAMPLE III

In addition to the first embodiment, the expansion casing 14 of the present embodiment is further configured, referring to fig. 6, as an inverted cone-shaped elastomer (made of rubber or the like, for example), and is composed of a first casing half 15 and a second casing half 16, and an adjustment gap 17 is formed between the first casing half 15 and the second casing half 16. During the use, steel strand wires 1 pass and adjust clearance 17, and the back taper post elastomer can warp in order to realize adjusting the function of clearance 17 self-adaptation regulation according to the pressurized condition by oneself, and then makes expansion sleeve 14 can press from both sides tightly not unidimensional steel strand wires 1.

Example four

The utility model discloses in, for installation and user demand, refer to fig. 7, jack 6 be punching jack 6, this punching jack 6 includes external cylinder body 22, has the opening and the activity sets up the internal cylinder body 23 in external cylinder body 22 and acts on the piston rod 24 of internal cylinder body 23.

Compared with the prior art, the difference lies in that the front end of the inner cylinder body 23 is provided with a first magnetic attraction piece 25, the rear end of the reaction cylinder 4 is provided with a second magnetic attraction piece 26, and the first magnetic attraction piece 25 and the second magnetic attraction piece 26 can be mutually adsorbed, so that the front end of the jack 6 is abutted against the reaction cylinder 4, the position relation between the jack 6 and the reaction cylinder 4 is stable and reliable, the phenomenon of separation caused by overlarge self weight of the jack 6 and the reaction cylinder 4 is prevented, and the falling condition is avoided.

EXAMPLE five

In order to prevent the detection device assembled on the steel strand 1 from falling, on the basis of the first embodiment, referring to fig. 8, in this embodiment, an anti-falling cap 27 is further sleeved at the tail end of the steel strand 1, and the anti-falling cap 27 can abut against the stress tester 7 to form a limiting anti-falling fit. The anti-drop cap 27 is assembled with the steel strand 1 by a detachable structure, such as a thread screwing manner, and is not particularly limited herein.

Preferably, the anti-falling cap 27 is provided with a self-clamping mechanism for clamping the steel strand 1. The more specific structure is as follows: the anti-falling cap 27 is provided with a jack 28, the inner wall of the jack 28 is provided with an annular groove 2910, the self-clamping mechanism comprises a plurality of clamping pieces 30 annularly arranged in the annular groove 2910 and a spring 31 connected between the clamping pieces 30 and the annular groove 2910, and a clamping space 32 is formed between each clamping piece 30. When the steel strand 1 of the large size specification enters the clamping space 32, the steel strand 1 of the large size specification can abut against the clamping piece 30 and force the spring 31 to deform and contract, and meanwhile, the clamping piece 30 retracts more into the annular groove 2910, so as to better accommodate and clamp the steel strand 1 of the large size specification; when the small-sized steel strand 1 enters the clamping space 32, the clamping piece 30 is stressed slightly so that the spring 31 is deformed and expanded outward to push the clamping piece 30 out of the annular groove 2910 more, so as to better adapt to and tighten the small-sized steel strand 1. Therefore, the self-clamping mechanism can be adapted to steel strands 1 of different sizes, and a better clamping effect is achieved.

The utility model provides a detection apparatus for effective stress under anchor, its specific operation mode is unanimous almost with prior art, can refer to local standard implementation, for example Zhejiang area, can refer to "highway bridge post-tensioned prestressing force construction technical specification" DB33/T2154-2018 (Zhejiang landmark), does not do the special restriction here.

The above, only be the preferred embodiment of the utility model, it is not right the utility model discloses do any restriction, all according to utility model technical substance to any simple modification, change and the equivalent structure change of doing of above embodiment, all still belong to the utility model discloses technical scheme's within the scope of protection.

Claims

1. A detection device for effective stress under an anchor comprises a plurality of steel strands (1) at least partially inserted into a concrete beam (2), a working anchor cable assembly (3) sequentially sleeved on the steel strands (1) from inside to outside, a reaction cylinder (4), spiral ribs (5) positioned on the periphery of the reaction cylinder (4), a jack (6) acting on the reaction cylinder (4), a stress tester (7), a tool anchor cable assembly (8) and an oil pump for driving the jack (6); the method is characterized in that: a transition partition plate (9) is arranged between the working anchor cable component (3) and the reaction cylinder (4); one end of the transition partition plate (9) is provided with a groove (10), and the working anchor cable assembly (3) is at least partially embedded into the groove (10); and a flange (11) is arranged at the other end of the transition partition plate (9), and the flange (11) is inserted into the reaction cylinder (4) and is abutted against the inner wall of the reaction cylinder (4).

2. The device for detecting the effective stress under anchor according to claim 1, wherein: still include a plurality of bunch frame (18), bunch frame (18) on seted up with the clearing hole of steel strand wires (1) one-to-one, just slip casting pipe (19) still wear to be equipped with in the center department of bunch frame (18), the front end of slip casting pipe (19) stretches into in concrete beam (2).

3. The device for detecting the effective stress under anchor according to claim 1, wherein: the working anchor cable assembly (3) comprises a sleeve body (12) provided with a plurality of accommodating through holes (13) and an expansion sleeve (14) embedded in the accommodating through holes (13), wherein the steel strand (1) penetrates through the expansion sleeve (14) so that the expansion sleeve (14) is tightly attached to the inner walls of the steel strand (1) and the accommodating through holes (13) respectively.

4. The device for detecting the effective stress under anchor according to claim 3, wherein: the expansion casing (14) is an inverted cone-shaped elastomer and consists of a first half casing (15) and a second half casing (16), and an adjusting gap (17) is formed between the first half casing (15) and the second half casing (16).

5. The device for detecting the effective stress under anchor according to claim 1, wherein: the jack (6) is a feed-through jack (6), and the feed-through jack (6) comprises an outer cylinder body (22), an inner cylinder body (23) which is provided with an opening and is movably arranged in the outer cylinder body (22), and a piston rod (24) acting on the inner cylinder body (23).

6. The apparatus for detecting the effective stress under anchor according to claim 5, wherein: the front end of the inner cylinder body (23) is provided with a first magnetic attraction piece (25), the rear end of the reaction cylinder (4) is provided with a second magnetic attraction piece (26), and the first magnetic attraction piece (25) and the second magnetic attraction piece (26) can be mutually adsorbed, so that the front end of the jack (6) is abutted against the reaction cylinder (4).

7. The device for detecting the effective stress under anchor according to claim 2, wherein: the through holes on the wire harness frame (18) consist of a plurality of circular through holes (20) positioned on the inner circle and semicircular through holes (21) positioned on the outer periphery.

8. The device for detecting the effective stress under anchor according to claim 1, wherein: the end of steel strand wires (1) still overlaps and is equipped with anticreep cap (27), anticreep cap (27) can with stress test appearance (7) offset and form spacing anticreep cooperation.

9. The apparatus for detecting the effective stress under anchor according to claim 8, wherein: the anti-drop cap (27) is internally provided with a self-clamping mechanism for clamping the steel strand (1).

10. The apparatus for detecting the effective stress under anchor according to claim 9, wherein: anticreep cap (27) seted up jack (28), the inner wall of jack (28) is equipped with an annular groove (29), self-clamping mechanism include that a plurality of ring establishes clamping piece (30) in annular groove (29) and connect spring (31) between clamping piece (30) and annular groove (29), each clamping piece (30) between form centre gripping space (32).