CN215857888U - Prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock - Google Patents
Prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock Download PDFInfo
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- CN215857888U CN215857888U CN202121382999.2U CN202121382999U CN215857888U CN 215857888 U CN215857888 U CN 215857888U CN 202121382999 U CN202121382999 U CN 202121382999U CN 215857888 U CN215857888 U CN 215857888U
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Abstract
The utility model relates to a prestress loading device of a finish rolling steel bar anti-pulling anchor rod, which comprises an anchor backing plate, an antifriction gasket, a thickening nut and an anchor rod, wherein the middle part of the anchor backing plate is provided with an anchor backing plate connecting hole in a penetrating manner, the anchor backing plate connecting hole comprises a ball socket-shaped hole and a cylindrical hole which are coaxially arranged and sequentially communicated from top to bottom, the thickening nut comprises a nut body and a ball segment which are integrally connected, the ball segment is arranged at the bottom of the nut body, the ball segment is positioned in the ball socket-shaped hole, coaxial nut connecting holes are arranged in the nut body and the ball segment in a penetrating manner, the anchor rod is inserted in the nut connecting hole and the cylindrical hole, and the antifriction gasket is positioned in the anchor backing plate connecting hole. Compared with the prior art, the utility model can avoid shearing damage to the anchor rod when prestress is applied, reduce the stress concentration degree of the anchor rod, ensure the prestress application effect of the anti-floating anchor rod, and reduce the friction torque between the thickening nut and the anchor backing plate, thereby improving the efficiency of converting the torque force of the anchor rod into the pretightening force of the anchor rod.
Description
Technical Field
The utility model relates to the field of constructional engineering, in particular to a prestress loading device of a finish-rolled steel bar uplift anchor rod.
Background
Along with the implementation of the construction standard JGJ 476-2019 of the technical Standard for anti-floating of the constructional engineering, the constructional engineering with the anti-floating design grade of the first grade does not generate tensile stress in the anchoring slurry under the standard combination of the load effect; in the anti-floating design grade B building engineering, the tensile stress in the anchoring slurry under the standard combination of the load effect is not greater than the tensile strength of the axis of the anchoring slurry. When the anchor rod is adopted as the anti-floating measure for a large number of constructional projects with anti-floating design grades of A and B, the anti-floating anchor rod needs to adopt a prestress process and use a prestress anti-floating anchor rod.
At present, two types of prestress loading devices are commonly used for an anchor rod, wherein one type of prestress loading device adopts a jack to stretch and is locked and fixed through an anchor device clamping piece; one kind adopts torque wrench to realize the application to the stock prestressing force through twisting tensioning nut and exerting certain moment of torsion. The anti-floating anchor rod anchor bar in the basement of the building engineering usually adopts finish rolled steel bars such as PSB1080, PSB1200 and the like, has higher tensile strength and lower stress relaxation performance, and is used as a rock anchor rod foundation, the length of the general anchor rod is not too long, so when a jack is adopted for tensioning and applying prestress, the loss of a prestress anchor caused by the retraction of an anchor clamping piece is relatively large; when the torsional tensioning nut is adopted to apply prestress, the tension termination value of the anchor bar is a locking value, and the loss of the prestressed anchorage device is less. In order to ensure sufficient effective prestress and meet the crack control requirement of the anchor rod in a working state, the anti-floating anchor rod of the basement usually adopts a torsional tensioning nut to apply prestress on the anchor rod.
At present, most of prestress loading devices for applying prestress to an anti-floating anchor rod by using a tensioning nut have the contact surfaces of an anchor backing plate and the tensioning nut which are planes, and in the prestress application process, the problems of flatness of the anchor backing plate, horizontal angle of a torque wrench during force application, verticality of the anchor rod and the like can cause the anchor rod and the end surface of anchor slurry to be in a complex stress state, so that the overall quality of the anchor rod is influenced. Meanwhile, the plane contact surfaces among the tensioning nut, the anchor backing plate and the anchoring slurry are required to be in tight contact, otherwise, stress concentration is also generated, so that the end face of the anchoring slurry is damaged, the tightening part of the tensioning nut is loosened, the prestress cannot be fully exerted, and the bearing capacity of the anchor rod is reduced.
In addition, the anchor backing plate and the tensioning nut are in direct plane contact, and in the process of applying torque by the torque wrench, as the pre-tightening pressure is high, a high horizontal torsion friction force is generated between the contact surfaces of the anchor backing plate and the tensioning nut, so that the pre-stress applying efficiency of the torque wrench is influenced; meanwhile, the horizontal torsional friction force can be transmitted to the top of the anchoring slurry through the anchor backing plate, and the tensile and shear-resistant bearing forces of the anchor rod and the anchoring slurry are far lower than the compressive bearing force of the anchor rod and the anchoring slurry, so that the anchoring slurry at the top of the anchor rod can be sheared and damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a prestress loading device of a finish-rolled steel bar uplift anchor rod.
The purpose of the utility model is realized by the following technical scheme:
the utility model provides a prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock, prestressing force loading device includes anchor backing plate, antifriction gasket, thickening nut and stock, the middle part of anchor backing plate is run through and has been seted up the anchor backing plate connecting hole, the anchor backing plate connecting hole includes ball socket form hole and the cylindric hole that coaxial setting and top-down communicate in proper order, thickening nut includes the nut body and the spherical segment of a body coupling, the bottom of nut body is located to the spherical segment, the spherical segment is located ball socket form hole, it is equipped with coaxial nut connecting hole to run through in nut body and the spherical segment, stock top-down inserts in proper order and establishes in nut connecting hole and cylindric hole, antifriction gasket is located the anchor backing plate connecting hole and contacts with the inner wall of anchor backing plate connecting hole and the outer wall of spherical segment respectively. The ball segment is a part obtained by cutting a ball by a plane, the upper part of the ball segment is cut off, and the lower part of the ball segment is incomplete due to the opening of the nut connecting hole.
The axial length of the ball-socket-shaped hole is equal to half of the thickness of the anchor backing plate.
The inner diameter of the cylindrical hole is larger than the outer diameter of the anchor rod.
The axial length of the ball segment is larger than that of the ball socket-shaped hole.
The nut body is in a regular hexagon shape, and the radius of a circle where the upper plane of the segment is located is larger than that of a circle circumscribed to the regular hexagon.
The inner diameter of the nut connecting hole is equal to the outer diameter of the anchor rod.
The axial length of the segment is smaller than that of the nut body.
The antifriction gasket includes flank, head and neck that top-down connected gradually, the flank is cyclic annular level and is located the top of anchor backing plate, the head is that the side is the cover barrel form of cambered surface to be located ball socket form hole, the neck is that the side is the vertical cylindric hole that is located of planar cover barrel form.
The inner diameter of the neck is larger than the outer diameter of the anchor rod. Namely, a margin is left between the anchor rod and the neck, and the anchor rod is only pre-stressed and loaded by the thickening nut.
The ball socket-shaped hole, the head of the antifriction gasket and the segment of the thickened nut are all concentric spherical surfaces with the same radius.
The antifriction gasket is made of polytetrafluoroethylene or nylon 1010 and high-density polyethylene.
When the nominal diameter of stock is 32mm, the axial total length of thickening nut is 55mm, anchor backing plate thickness is 30mm, and the diameter that is regular hexagon's nut body circumscribed circle is 66mm, the axial length of nut body is 35mm, the axial length of spherical segment is 20mm, and the axial length in ball socket form hole is 15mm, the axial length in cylindric hole is 15mm, the internal diameter in cylindric hole is 38 mm.
Considering that the best stress state of the anchor rod is only under the stretching action, the high-strength effect of the anchor rod can be exerted most effectively, and if the anchor rod is under the combined stress of stretching, shearing and twisting at the maximum stress position of the top surface of the anchor backing plate in the prestress application process, the thread section of the anchor rod is easy to break. The bottom of the thickening nut is arranged to be in a spherical segment shape, the upper half section of the anchor backing plate connecting hole penetrating through the anchor backing plate is arranged to be in a spherical socket shape, the radii of balls where the spherical segment and the spherical socket are located are the same, so that the contact surface is ensured to be matched, the shearing damage to the anchor rod when prestress is applied can be avoided, the stress concentration degree of the anchor rod is reduced, the top surface of the anchor slurry is prevented from being damaged due to the complex stress state of the top of the anchor slurry, the tightening part of the thickening nut is loosened, the prestress cannot be fully exerted, the bearing capacity of the anchor rod is reduced, and the prestress applying effect of the anti-floating anchor rod is finally ensured.
In addition, a layer of antifriction gasket is arranged between the ball notch at the bottom of the thickening nut and the anchor backing plate, and the antifriction gasket is mainly used for reducing the friction torque between the thickening nut and the anchor backing plate, so that the efficiency of converting the torque force of the anchor rod into the pretightening force of the anchor rod is improved.
Drawings
FIG. 1 is an isometric view of an assembled structure of the pre-stress loading apparatus of the present invention;
FIG. 2 is a perspective view of the prestress loading unit of the present invention, shown disassembled from member;
FIG. 3 is a cross-sectional view of the pre-stress loading device of the present invention;
fig. 4 is a structural plan view of the prestress loading device (the anchor rod is omitted) of the utility model.
In the figure: 1-anchor backing plate; 101-ball and socket shaped holes; 102-cylindrical holes; 2-antifriction pads; 201-flank; 202-a head; 203-neck; 3-thickening the nut; 301-a nut body; 302-segment of sphere; 303-nut attachment holes; 4-anchor rod.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments.
Examples
As shown in fig. 1, 2, 3 and 4, the prestress loading device of the finish rolling steel bar uplift anchor rod comprises an anchor backing plate 1, an antifriction gasket 2, a thickening nut 3 and an anchor rod 4, wherein the middle part of the anchor backing plate 1 is provided with an anchor backing plate connecting hole in a penetrating manner, and the anchor backing plate connecting hole comprises a ball socket-shaped hole 101 and a cylindrical hole 102 which are coaxially arranged and sequentially communicated from top to bottom (the diameter of a ball in which the ball socket-shaped hole 101 is located is larger than the inner diameter of the cylindrical hole); the thickening nut 3 comprises a nut body 301 and a segment 302 which are integrally connected (the segment is hemispherical in the embodiment and the bottom of the segment is absent due to the arrangement of a nut connecting hole 303), the segment 302 is arranged at the bottom of the nut body 301, the segment 302 is positioned in a ball socket-shaped hole 101, the nut body 301 and the segment 302 are provided with coaxial nut connecting holes 303 in a penetrating manner, and the anchor rod 4 is sequentially inserted into the nut connecting hole 303 and the cylindrical hole 102 from top to bottom. Wherein, the axial length of ball socket form hole 101 equals half of anchor backing plate 1 thickness, the internal diameter of cylindric hole 102 is greater than the external diameter of stock 4 (because be equipped with the screw thread along circumference on the lateral wall of stock, so the external diameter of stock here refers to the distance of the outside of screw thread to the center of stock, the same down), the upper portion of segment 302 is located outside ball socket form hole 101, nut body 301 is regular hexagon, the radius of the last plane place circle of segment 302 is greater than the radius of the outer circumcircle of regular hexagon, the internal diameter of nut connecting hole 303 equals the external diameter of stock 4, the axial length of segment 302 is less than the axial length of nut body 301. Antifriction gasket 2 is located the anchor backing plate connecting hole and contacts with the inner wall of anchor backing plate connecting hole and the outer wall of segment 302 respectively, antifriction gasket 2 includes flank 201 that top-down communicates in proper order, head 202 and neck 203, flank 201 is cyclic annular level and is located the top of anchor backing plate 1, head 202 is that the side is in ball socket form hole 101 for the cover tube form of cambered surface, neck 203 is that the side is the vertical cylindric hole 102 that is arranged in of planar cover tube form, the internal diameter of neck 203 is greater than the external diameter of stock 4, ball socket form hole 101, antifriction gasket 2's head 202 and thickening nut 3's segment 302 are the same concentric sphere of radius, antifriction gasket 2 adopts nylon 1010 or high density polyethylene and polytetrafluoroethylene to make.
Specifically, when the nominal diameter of stock 4 is 32mm, thickening nut 3's axial overall length is 55mm, and the diameter that is regular hexagon's nut body 301 circumcircle is 66mm, and nut body 301's axial length is 35mm, and the axial length of segment 302 is 20mm, and the axial length of ball-and-socket hole 101 is 15mm, and the thickness of anchor backing plate 1 is 30mm, and the axial length of cylindric hole 102 is 15mm, and the internal diameter of cylindric hole 102 is 38 mm. In practice, the above dimensional ratio relationship between the components can be used.
The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The prestress loading device of the finish rolling reinforcing steel bar pulling-resistant anchor rod is characterized by comprising an anchor backing plate (1), an antifriction gasket (2), a thickening nut (3) and an anchor rod (4), wherein an anchor backing plate connecting hole is formed in the middle of the anchor backing plate (1) in a penetrating mode, the anchor backing plate connecting hole comprises a ball socket-shaped hole (101) and a cylindrical hole (102) which are coaxially arranged and sequentially communicated from top to bottom, the thickening nut (3) comprises a nut body (301) and a segment (302) which are integrally connected, the segment (302) is arranged at the bottom of the nut body (301), the segment (302) is located in the ball socket-shaped hole (101), coaxial nut connecting holes (303) are formed in the nut body (301) and the segment (302) in a penetrating mode, and the anchor rod (4) is sequentially inserted into the nut connecting hole (303) and the cylindrical hole (102) from top to bottom, the antifriction gasket (2) is positioned in the anchor backing plate connecting hole and is respectively contacted with the inner wall of the anchor backing plate connecting hole and the outer wall of the ball segment (302).
2. The pre-stress loading device of a finish rolled steel bar anti-pulling anchor rod as claimed in claim 1, wherein the axial length of the ball socket shaped hole (101) is equal to half of the thickness of the anchor backing plate (1).
3. The prestress loading device of finish rolled steel bar anti-pulling anchor rod according to claim 1, wherein the axial length of the ball segment (302) is greater than the axial length of the ball-and-socket hole (101).
4. The prestress loading device of the finish rolled steel bar anti-pulling anchor rod as claimed in claim 1, wherein the nut body (301) is in a regular hexagon shape, and the radius of the circle on which the upper plane of the segment (302) is located is larger than the radius of the circumscribed circle of the regular hexagon.
5. The prestress loading device of finish rolled steel bar anti-pulling anchor rod according to claim 1, wherein the inner diameter of the cylindrical hole (102) is larger than the outer diameter of the anchor rod (4), and the inner diameter of the nut connecting hole (303) is equal to the outer diameter of the anchor rod (4).
6. The prestress loading device of finish rolled steel bar anti-pulling anchor rod according to claim 1, wherein the axial length of said segment (302) is smaller than the axial length of the nut body (301).
7. The pre-stress loading device of the finish rolling steel bar pulling-resistant anchor rod is characterized in that the antifriction gasket (2) comprises a side wing (201), a head part (202) and a neck part (203) which are sequentially connected from top to bottom, the side wing (201) is located at the top of the anchor backing plate (1) in an annular horizontal mode, the head part (202) is located in a ball socket-shaped hole (101) in a sleeve shape with a cambered side surface, and the neck part (203) is vertically located in a cylindrical hole (102) in a sleeve shape with a plane side surface.
8. The prestress loading device of finish rolled steel bar anti-pulling anchor rod according to claim 7, wherein the inner diameter of the neck portion (203) is larger than the outer diameter of the anchor rod (4).
9. The pre-stress loading device of the finish rolled steel bar anti-pulling anchor rod as claimed in claim 7, wherein the ball socket-shaped hole (101), the head (202) of the anti-friction gasket (2) and the ball segment (302) of the thickening nut (3) are concentric spheres with the same radius.
10. The pre-stress loading device of the finish rolled steel bar uplift anchor rod according to claim 1, wherein when the nominal diameter of the anchor rod (4) is 32mm, the total axial length of the thickening nut (3) is 55mm, the diameter of the circumscribed circle of the regular hexagonal nut body (301) is 66mm, the axial length of the nut body (301) is 35mm, the axial length of the segment (302) is 20mm, the thickness of the anchor backing plate (1) is 30mm, the axial length of the cylindrical hole (102) is 15mm, and the inner diameter of the cylindrical hole (102) is 38 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121382999.2U CN215857888U (en) | 2021-06-22 | 2021-06-22 | Prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121382999.2U CN215857888U (en) | 2021-06-22 | 2021-06-22 | Prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock |
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| CN215857888U true CN215857888U (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121382999.2U Active CN215857888U (en) | 2021-06-22 | 2021-06-22 | Prestressing force loading device of finish rolling reinforcing bar resistance to plucking stock |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592512A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Anchor structure for reducing size and thickness of anchor backing plate |
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2021
- 2021-06-22 CN CN202121382999.2U patent/CN215857888U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114592512A (en) * | 2022-03-11 | 2022-06-07 | 深圳市工勘岩土集团有限公司 | Anchor structure for reducing size and thickness of anchor backing plate |
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