CN113882367B - Anchor rod pulling resistance test structure based on connecting sleeve after sealing anchor - Google Patents
Anchor rod pulling resistance test structure based on connecting sleeve after sealing anchor Download PDFInfo
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- CN113882367B CN113882367B CN202111234986.5A CN202111234986A CN113882367B CN 113882367 B CN113882367 B CN 113882367B CN 202111234986 A CN202111234986 A CN 202111234986A CN 113882367 B CN113882367 B CN 113882367B
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- anchor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention relates to the technical field of anchor rod anti-pulling structures, and discloses an anchor rod anti-pulling test structure after anchor sealing based on a connecting sleeve, which comprises a threaded reinforcing steel bar and the connecting sleeve fixedly connected with an exposed anchor bar on an anchor device, wherein the anchor device is arranged on the outer surface of a building, a connecting cavity is arranged in the connecting sleeve, and the connecting cavity penetrates through the top and the bottom of the connecting sleeve; the exposed anchor bars are inserted and fixed at the lower part of the connecting cavity from bottom to top, and the lower ends of the twisted steel bars are inserted and fixed at the upper part of the connecting cavity from top to bottom; the upper end of the screw thread steel bar is connected with a jack for applying upward tension to the screw thread steel bar; like this, the lower part connection of exposing the anchor bar and connecting the chamber is fixed through the connecting sleeve, and rethread connecting sleeve is fixed with the upper portion connection of screw thread reinforcing bar and connecting the chamber to the extension of exposing the anchor bar that will be too short, the rethread jack is exerted upward tensile force to the screw thread reinforcing bar, and then can detect the holding load of stock, thereby can carry out the stock resistance to plucking test after sealing the anchor smoothly.
Description
Technical Field
The invention relates to the technical field of anchor rod anti-pulling structures, in particular to an anchor rod anti-pulling test structure after anchor sealing based on a connecting sleeve.
Background
The anchor rod is a rod system structure for reinforcing rock and soil bodies, and is mainly used for reinforcing main bodies of slopes, tunnels, dam bodies and the like. The anchor rod is divided into a free section and an anchoring section, wherein the free section can transmit the tensile force at the head of the anchor rod to the area of an anchor body and has the function of applying prestress to the anchor rod; the anchoring section refers to an area where the cement paste bonds the prestressed tendons with the soil layer, and has the functions of increasing the bonding friction effect of the anchoring body and the soil layer, increasing the bearing effect of the anchoring body and transmitting the tensile force of the free section to the depth of the soil body.
At present, the anchor bolt support has the advantages of high construction speed, small construction difficulty, light construction equipment, small construction occupation, low manufacturing cost and the like, and is widely applied to the engineering field such as foundation pit, side slope, bridge engineering and the like.
However, after some bolts are sealed, the exposed bolts can be cut off, and after the concrete layer on the outer surface is broken, the length of the remaining exposed bolts is too short, so that the bolt pulling-resistant test cannot be directly performed, and therefore a device capable of clamping and fixing the exposed bolts is required to be found, so that the bolt pulling-resistant test can be performed, and the holding load of the bolts can be detected.
Disclosure of Invention
The invention aims to provide a connecting sleeve-based anchor rod pulling-resistant test structure after anchor sealing, and aims to solve the problem that in the prior art, exposed anchor bars are too short and are inconvenient to conduct pulling-resistant tests.
The invention is realized in such a way that the anchor rod pulling resistance test structure after the anchor sealing based on the connecting sleeve comprises a threaded reinforcing steel bar and the connecting sleeve for fixedly connecting the exposed anchor bar on the anchor, wherein the anchor is arranged on the outer surface of a building, the inside of the connecting sleeve is provided with a connecting cavity, and the connecting cavity penetrates through the top and the bottom of the connecting sleeve; the exposed anchor bars are inserted and fixed at the lower part of the connecting cavity from bottom to top, and the lower ends of the threaded reinforcing bars are inserted and fixed at the upper part of the connecting cavity from top to bottom; the upper end of the twisted steel is connected with a jack which applies upward tension to the twisted steel.
Further, the upper part of the connecting cavity is a threaded cavity, and the lower end of the threaded reinforcing steel bar is inserted into the threaded cavity and is fixedly connected with the threaded cavity in a threaded manner.
Further, an anchor bar cavity for inserting an exposed anchor bar is formed in the lower portion of the connecting cavity, an annular space is formed between the anchor bar cavity and the exposed anchor bar, a plurality of wedge-shaped clamping blocks are inserted into the annular space, and the wedge-shaped clamping blocks are arranged at intervals around the periphery of the exposed anchor bar; the anchor bar cavity is sleeved on the periphery of the exposed anchor bar from top to bottom, and the wedge-shaped clamping blocks are inserted into the annular space from top to bottom;
when the wedge-shaped clamping blocks are inserted into the set positions in the annular intervals, the outer surfaces of the wedge-shaped clamping blocks are propped against the inner side walls of the anchor bar cavities, the inner surfaces of the wedge-shaped clamping blocks are propped against the outer side walls of the exposed anchor bars, and the plurality of wedge-shaped clamping blocks are used for annularly clamping the exposed anchor bars so as to fix the exposed anchor bars in the anchor bar cavities.
Further, a wedge-shaped block is arranged at the lower part of the anchor bar cavity, the outer surface of the wedge-shaped block extends linearly along the direction of inserting the wedge-shaped clamping block into the annular space, the lower part of the inner surface of the wedge-shaped block is provided with a clamping surface extending linearly, the upper part of the inner surface of the wedge-shaped block is provided with an inclined surface, an annular space is formed between the inclined surface and the exposed anchor bar, the inclined surface deviates from the exposed anchor bar and is arranged obliquely outwards, and the clamping surface is propped against the outer surface of the wedge-shaped clamping block; the bottoms of the connecting sleeve and the wedge block are respectively propped against the top of the anchor.
Further, a plurality of pairs of through holes which are oppositely arranged are arranged at the lower part of the connecting sleeve, and a connecting line between two opposite through holes passes through the annular interval; and clamping strips penetrate through the annular space and are pressed against the outer surface of the exposed anchor bar on the inner sides of the clamping strips.
Further, the lower part of the connecting sleeve is provided with an insertion hole, the insertion hole is arranged between two through holes which are oppositely arranged and aligned with the clamping strips in the annular space, a pressing column is embedded and fixed in the insertion hole, the outer end of the pressing column extends to the outside of the connecting sleeve, the inner end of the pressing column presses against the outer side of the clamping strips, and inward pressing force is applied to the outer side of the clamping strips.
Further, a plurality of exposed anchor bars are arranged on the anchor, the plurality of exposed anchor bars are arranged around the center of the anchor, and each exposed anchor bar is fixedly connected with the connecting sleeve.
Further, the outer circumferences of the plurality of connecting sleeves are wrapped with tightening rings, the inner side walls of the tightening rings are propped against the connecting sleeves, and inward propping force is generated on the connecting sleeves; the connecting sleeves and the tightening rings are enclosed to form enclosed areas, the enclosed areas are filled with a plurality of elastic steel rings with lateral elastic deformation, and the outer surfaces of the elastic steel rings are propped against the connecting sleeves or the tightening rings.
Further, a supporting frame is arranged on the outer surface of the building, the bottom of the supporting frame is propped against the outer surface of the building, the supporting frame is covered on the periphery of the anchor, the jack is arranged at the top of the supporting frame, and the upper end of the screw thread reinforcing steel bar penetrates through the supporting frame and is fixedly connected with the jack; the jack applies downward pressure to the supporting frame and applies upward tension to the twisted steel reversely.
Further, the top of support frame has up end, the up end of support frame is sunken downwards to be formed with restriction the gliding recess of jack, the bottom of recess has interior bottom surface, the bottom of jack is embedded in the recess, and supports to press on the interior bottom surface of recess.
Compared with the prior art, the anchor rod pulling-resistant test structure based on the connecting sleeve after the anchor sealing is provided by the invention has the advantages that the exposed anchor bar is fixedly connected with the lower part of the connecting cavity through the connecting sleeve, the threaded steel bar is fixedly connected with the upper part of the connecting cavity through the connecting sleeve, the excessively short exposed anchor bar is lengthened, and the jack at the upper end of the threaded steel bar applies upward tensile force to the threaded steel bar, so that the holding load of the anchor rod can be detected, and the anchor rod pulling-resistant test after the anchor sealing can be smoothly carried out.
Drawings
Fig. 1 is a schematic structural view of an anchor rod pullout resistance test structure after an anchor is sealed based on a connecting sleeve;
FIG. 2 is a schematic cross-sectional view of a coupling sleeve provided by the present invention;
FIG. 3 is a schematic top view of the clamping bar and the pressing column according to the present invention;
FIG. 4 is a schematic top view of the engagement of the clamping ring and the spring steel ring provided by the present invention;
fig. 5 is a schematic diagram of a cut-away structure of a jack and a groove of a supporting frame according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and 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.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-5, a preferred embodiment of the present invention is provided.
The anchor rod pulling resistance test structure after the anchor sealing based on the connecting sleeve 200 comprises a threaded steel bar 100 and the connecting sleeve 200, wherein the connecting sleeve 200 is used for fixedly connecting an exposed anchor bar 400 on an anchor 300, the anchor 300 is arranged on the outer surface of a building, a connecting cavity is formed in the connecting sleeve 200, and the connecting cavity penetrates through the top and the bottom of the connecting sleeve 200; the exposed anchor bar 400 is inserted and fixed at the lower part of the connecting cavity from bottom to top, and the lower end of the twisted steel 100 is inserted and fixed at the upper part of the connecting cavity from top to bottom; a jack 500 for applying upward tension to the rebar 100 is connected to the upper end of the rebar 100.
In this way, the exposed anchor bar 400 is fixedly connected with the lower part of the connecting cavity through the connecting sleeve 200, and the threaded steel bar 100 is fixedly connected with the upper part of the connecting cavity through the connecting sleeve 200, so that the excessively short exposed anchor bar 400 is lengthened, and the jack 500 at the upper end of the threaded steel bar 100 applies upward tensile force to the threaded steel bar 100, so that the upward tensile force is indirectly generated to the anchor 300, the holding load of the anchor rod can be detected, and the anchor rod pulling resistance test after the anchor sealing can be smoothly carried out.
The upper portion of the connecting cavity is a threaded cavity 201, the lower end of the threaded reinforcing steel bar 100 is inserted into the threaded cavity 201 and fixedly connected with the threaded cavity 201 in a threaded mode, the threaded reinforcing steel bar 100 is fixed through threaded connection, and the connecting structure is simple in structure and convenient to operate.
The lower part of the connecting cavity is provided with an anchor bar cavity for inserting the exposed anchor bar 400, an annular interval 600 is arranged between the anchor bar cavity and the exposed anchor bar 400, a plurality of wedge-shaped clamping blocks 700 are inserted into the annular interval 600, and the plurality of wedge-shaped clamping blocks 700 are arranged at intervals around the periphery of the exposed anchor bar 400; the anchor bar cavity is sleeved on the periphery of the exposed anchor bar 400 from top to bottom, and the wedge-shaped clamping blocks 700 are inserted into the annular space 600 from top to bottom;
when the wedge-shaped clamping blocks 700 are inserted into the annular space 600 at set positions, the outer surfaces of the wedge-shaped clamping blocks 700 are abutted against the inner side walls of the anchor bar cavities, the inner surfaces of the wedge-shaped clamping blocks 700 are abutted against the outer side walls of the exposed anchor bars 400, and the plurality of wedge-shaped clamping blocks 700 clamp the exposed anchor bars 400 in an annular mode to fix the exposed anchor bars 400 in the anchor bar cavities.
Thus, when the exposed anchor bar 400 is inserted into the anchor bar cavity from bottom to top, the threaded steel bar 100 is inserted into the threaded cavity 201 from top to bottom, and the wedge-shaped clamping block 700 is pushed to move downwards to insert the annular space 600 to a set position, the wedge-shaped clamping block 700 tightly abuts against the exposed anchor bar 400 and is clamped in an annular shape, the connection is stable, and the operation is simple and convenient.
The lower part of the anchor bar cavity is provided with a wedge block 800, the outer surface of the wedge block 800 linearly extends along the direction of inserting the wedge clamping block 700 into the annular interval 600, the lower part of the inner surface of the wedge block 800 is provided with a clamping surface linearly extending, the upper part of the inner surface of the wedge block 800 is provided with an inclined surface, an annular space is formed between the inclined surface and the exposed anchor bar 400, the inclined surface is inclined outwards away from the exposed anchor bar 400, and the clamping surface is propped against the outer surface of the wedge clamping block 700; the bottoms of the connection sleeve 200 and wedge block 800 respectively bear against the top of the anchor 300.
In this way, the exposed anchor bar 400 is convenient to insert into the anchor bar cavity from bottom to top, and the bottoms of the connecting sleeve 200 and the wedge block 800 are all abutted with the top of the anchor 300, so that the exposed anchor bar 400 is fully contained in the connecting sleeve 200, the contact area between the exposed anchor bar 400 and the connecting sleeve 200 is increased, and the subsequent anti-pulling test is facilitated to be carried out smoothly.
The lower part of the connection sleeve 200 is provided with a plurality of pairs of through holes which are oppositely arranged, and a connecting line between the two opposite through holes passes through the annular space 600; a clamping bar 900 is arranged between the two opposite through holes in a penetrating way, the clamping bar 900 penetrates through the annular space 600, and the inner side of the clamping bar 900 is pressed against the outer surface of the exposed anchor bar 400. The clamping strip 900 can further clamp the exposed anchor bar 400, so as to improve the connection firmness of the exposed anchor bar 400 and the connecting sleeve 200.
The lower portion of the connection sleeve 200 is provided with an insertion hole which is disposed between two oppositely disposed through holes and is disposed in alignment with the clamping bars 900 in the annular space 600, the insertion hole is embedded and fixed with a pressing post 110, the outer end of the pressing post 110 extends to the outside of the connection sleeve 200, the inner end of the pressing post 110 presses against the outer side of the clamping bars 900, and inward pressing force is applied to the outer side of the clamping bars 900.
In this way, the low-pressure column is pressed against the clamping strip 900 from outside to inside, so that the clamping force of the clamping strip 900 on the exposed anchor bar 400 is enhanced, and the connection firmness of the exposed anchor bar 400 and the connecting sleeve 200 is further improved.
The anchor 300 is provided with a plurality of exposed anchor bars 400, the plurality of exposed anchor bars 400 are arranged around the center of the anchor 300, and each exposed anchor bar 400 is fixedly connected with a connecting sleeve 200, so that the connecting sleeve 200 is respectively connected with the plurality of exposed anchor bars 400, and the connection stability of the anchor rod anti-pulling test structure and the anchor 300 is further improved.
The outer circumferences of the plurality of connecting sleeves 200 are wrapped with the tightening rings 120, and the inner side walls of the tightening rings 120 are propped against the connecting sleeves 200 and generate inward propping force on the connecting sleeves 200; the plurality of connecting sleeves 200 and the connecting sleeve 200 and the fastening ring 120 are enclosed to form an enclosing area, the enclosing area is filled with a plurality of elastic steel rings 130 with lateral elastic deformation, and the outer surface of the elastic steel rings 130 is pressed against the connecting sleeve 200 or the fastening ring 120.
In this way, the tightening ring 120 applies inward extrusion force to the plurality of connecting sleeves 200 and applies outward extrusion force to the connecting sleeves 200 by the plurality of elastic steel rings 130 in the enclosing area, so that the connecting sleeves 200 are integrated, the holding load of the anchor rod is detected, and the pulling test is performed smoothly.
The outer surface of the building is provided with a support frame 140, the bottom of the support frame 140 is propped against the outer surface of the building, the support frame 140 is covered on the periphery of the anchor 300, a jack 500 is arranged at the top of the support frame 140, and the upper end of the screw thread reinforcing steel bar 100 passes through the support frame 140 and is fixedly connected with the jack 500; the jack 500 applies upward tensioning force to the rebar 100 in the opposite direction by applying downward pressure to the support 140.
The jack 500 is arranged on the support frame 140, the upper end of the screw thread reinforcing steel bar 100 penetrates through the support frame 140 to be connected with the jack 500, downward pressure is applied to the support frame 140 through the jack 500, so that upward tension is generated on the screw thread reinforcing steel bar 100 relative to the jack 500, the exposed anchor bar 400 is subjected to upward tension, and the detection test of the holding load of the anchor rod is realized.
The top of the support 140 has an upward upper end surface, the upper end surface of the support 140 is downward recessed to form a groove for limiting the jack 500 to slide, the bottom of the groove has an inner bottom surface, and the bottom of the jack 500 is embedded in the groove and is pressed against the inner bottom surface of the groove. Thus, through the limiting action of the grooves on the support frame 140 on the jack 500, when the outer surface of the detected building is a slope, the jack 500 is prevented from generating downward pressure on the threaded steel bar 100, and the detection result of the holding load of the anchor rod is influenced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The anchor rod pulling resistance test structure after the anchor sealing based on the connecting sleeve is characterized by comprising a threaded reinforcing steel bar and the connecting sleeve for fixedly connecting the exposed anchor bar on the anchor, wherein the anchor is arranged on the outer surface of a building, the inside of the connecting sleeve is provided with a connecting cavity, and the connecting cavity penetrates through the top and the bottom of the connecting sleeve; the exposed anchor bars are inserted and fixed at the lower part of the connecting cavity from bottom to top, and the lower ends of the threaded reinforcing bars are inserted and fixed at the upper part of the connecting cavity from top to bottom; the upper end of the threaded steel bar is connected with a jack for applying upward tension to the threaded steel bar;
the lower part of the connecting cavity is provided with an anchor bar cavity for inserting an exposed anchor bar, an annular space is arranged between the anchor bar cavity and the exposed anchor bar, a plurality of wedge-shaped clamping blocks are inserted into the annular space, and the wedge-shaped clamping blocks are arranged at intervals around the periphery of the exposed anchor bar; the anchor bar cavity is sleeved on the periphery of the exposed anchor bar from top to bottom, and the wedge-shaped clamping blocks are inserted into the annular space from top to bottom;
when the wedge-shaped clamping blocks are inserted into the set positions in the annular intervals, the outer surfaces of the wedge-shaped clamping blocks are propped against the inner side walls of the anchor bar cavities, the inner surfaces of the wedge-shaped clamping blocks are propped against the outer side walls of the exposed anchor bars, and the plurality of wedge-shaped clamping blocks clamp the exposed anchor bars in an annular mode to fix the exposed anchor bars in the anchor bar cavities;
the lower part of the anchor bar cavity is provided with a wedge-shaped block, the outer surface of the wedge-shaped block extends linearly along the direction of inserting the wedge-shaped clamping block into the annular space, the lower part of the inner surface of the wedge-shaped block is provided with a clamping surface extending linearly, the upper part of the inner surface of the wedge-shaped block is provided with an inclined surface, an annular space is formed between the inclined surface and the exposed anchor bar, the inclined surface deviates from the exposed anchor bar and is arranged obliquely outwards, and the clamping surface is propped against the outer surface of the wedge-shaped clamping block; the bottoms of the connecting sleeve and the wedge block are respectively propped against the top of the anchor;
the lower part of the connecting sleeve is provided with a plurality of pairs of through holes which are oppositely arranged, and a connecting line between two opposite through holes passes through the annular interval; clamping strips penetrate through the annular space and are pressed against the outer surface of the exposed anchor bar by the inner sides of the clamping strips;
the lower part of the connecting sleeve is provided with an insertion hole, the insertion hole is arranged between two through holes which are arranged oppositely, the clamping strips in the annular space are aligned, a pressing column is embedded and fixed in the insertion hole, the outer end of the pressing column extends to the outside of the connecting sleeve, the inner end of the pressing column presses against the outer side of the clamping strip, and inward pressing force is applied to the outer side of the clamping strip;
the anchor is provided with a plurality of exposed anchor bars, the plurality of exposed anchor bars are arranged around the center of the anchor, and each exposed anchor bar is fixedly connected with the connecting sleeve;
the outer circumferences of the connecting sleeves are wrapped with tightening rings, and the inner side walls of the tightening rings are propped against the connecting sleeves and generate inward propping force on the connecting sleeves; the connecting sleeves and the tightening rings are enclosed to form enclosed areas, the enclosed areas are filled with a plurality of elastic steel rings with lateral elastic deformation, and the outer surfaces of the elastic steel rings are propped against the connecting sleeves or the tightening rings.
2. The structure for testing the pullout resistance of the anchor rod after the anchor sealing based on the connecting sleeve as claimed in claim 1, wherein the upper part of the connecting cavity is a threaded cavity, and the lower end of the threaded reinforcing steel bar is inserted into the threaded cavity and is fixedly connected with the threaded cavity in a threaded manner.
3. The anchor rod pulling-resistant test structure after the anchor sealing based on the connecting sleeve is characterized in that a supporting frame is arranged on the outer surface of the building, the bottom of the supporting frame is propped against the outer surface of the building, the supporting frame is covered on the periphery of an anchor, a jack is arranged on the top of the supporting frame, and the upper end of a threaded reinforcing bar penetrates through the supporting frame and is fixedly connected with the jack; the jack applies downward pressure to the supporting frame and applies upward tension to the twisted steel reversely.
4. A connection sleeve based post-bolting pull-out test structure according to claim 3, wherein the top of said support frame has an upward facing upper end surface, said upper end surface of said support frame is downwardly recessed to form a recess for limiting the sliding of said jack, the bottom of said recess has an inner bottom surface, and the bottom of said jack is embedded in said recess and is pressed against said inner bottom surface of said recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234986.5A CN113882367B (en) | 2021-10-22 | 2021-10-22 | Anchor rod pulling resistance test structure based on connecting sleeve after sealing anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111234986.5A CN113882367B (en) | 2021-10-22 | 2021-10-22 | Anchor rod pulling resistance test structure based on connecting sleeve after sealing anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113882367A CN113882367A (en) | 2022-01-04 |
| CN113882367B true CN113882367B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111234986.5A Active CN113882367B (en) | 2021-10-22 | 2021-10-22 | Anchor rod pulling resistance test structure based on connecting sleeve after sealing anchor |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2992252B2 (en) * | 1997-08-07 | 1999-12-20 | 黒沢建設株式会社 | Ground anchor head fixing device |
| CN102589973B (en) * | 2012-02-13 | 2013-11-20 | 宁波交通工程建设集团有限公司 | Pullout test auxiliary device for hook anchor rod and test method |
| CN106638319A (en) * | 2016-12-05 | 2017-05-10 | 中铁五局集团贵州工程有限公司 | Sleeve fastening device for finish-rolled threaded reinforcing bar anchorage device |
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