CN113847316A - High-strength double-expansion sleeve type expansion anchor bolt for crack concrete - Google Patents
High-strength double-expansion sleeve type expansion anchor bolt for crack concrete Download PDFInfo
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- CN113847316A CN113847316A CN202111120760.2A CN202111120760A CN113847316A CN 113847316 A CN113847316 A CN 113847316A CN 202111120760 A CN202111120760 A CN 202111120760A CN 113847316 A CN113847316 A CN 113847316A
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- expansion
- friction
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- expansion sleeve
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- 238000005336 cracking Methods 0.000 claims description 23
- 230000003068 static effect Effects 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 206010040007 Sense of oppression Diseases 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
- F16B13/068—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like expanded in two or more places
Abstract
The invention relates to a high-strength double-expansion sleeve type expansion anchor bolt for crack concrete, which comprises a screw rod, wherein the screw rod is provided with a thread section distributed at one end and a tightening section distributed at the other end, the screw rod is detachably connected with a nut distributed in the thread section, and a flat gasket sleeved on the screw rod is arranged on one side of the nut facing the tightening section, and the expansion anchor bolt is characterized in that: the screw rod is linked with a first friction expansion sleeve and a second friction expansion sleeve which are distributed on the tightening section. The invention has the beneficial effects that: a high-strength double-expansion-sleeve type expansion anchor bolt for crack concrete is suitable for both static load generated by building compression and dynamic load caused by earthquake.
Description
Technical Field
The invention relates to the technical field of expansion anchor bolts, in particular to a high-strength double-expansion-sleeve type expansion anchor bolt for crack concrete.
Background
Since the members are installed on the concrete foundation, which has a high requirement for connection strength, expansion bolts are generally used. The crack concrete is mainly subjected to static load generated by building compression or dynamic load caused by earthquake, and the crack concrete is influenced by the two modes, so that the performance of the expansion anchor bolt has higher requirements.
At present, the expansion anchor bolt in the market mainly comprises screw rod, a set of friction expansion cover, nut, plain washer, and wherein the screw rod is located to the friction expansion cover, and the nut is connected with the screw thread portion of the screw rod other end, and the plain washer distributes between nut and friction expansion cover. The existing expansion anchor bolt can only complete connection, but aiming at the condition with higher requirement, the existing expansion anchor bolt has insufficient connection strength, lower safety performance and incapability of tightening, and the expansion anchor bolt is easy to loosen.
Among the prior art, improve joint strength through once only binding a plurality of expansion anchor bolts, this directly has increaseed operating personnel's work load, makes installation time extension, influences work efficiency. And multiple holes are punched, so that the crack of the concrete is more easily accelerated to expand or increase, and the safety performance is relatively reduced.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a high-strength double-expansion-sleeve-type expansion anchor for a fractured concrete, which is applicable to both a static load caused by a building stress and a dynamic load caused by an earthquake.
In order to achieve the purpose, the invention provides the following technical scheme: two expansion sleeve type expansion anchor of high strength for crack concrete, including the screw rod, the screw rod is equipped with and distributes in the screw thread section of one end, distributes in the section of tightening up of the other end, the screw rod can be dismantled and be connected with the nut of distributing in the screw thread section, the nut is located and is equipped with the flat washer that the cover was located on the screw rod towards one side of the section of tightening up, its characterized in that, the screw rod linkage has first friction expansion cover, the second friction expansion cover of distributing in the section of tightening up.
By adopting the technical scheme, the riveting strength of the expansion anchor bolt is increased by arranging the two sets of friction expansion sleeves, and the expansion anchor bolt is applicable when the crack concrete is subjected to static load generated by building compression or dynamic load caused by earthquake.
The high-strength double-expansion-sleeve type expansion anchor bolt for the fractured concrete can be further set as follows: at least two groups of first expansion gaps are uniformly distributed on the first friction expansion sleeve, one end of each first expansion gap is open and distributed, the other end of each first expansion gap is provided with a first arc-shaped anti-cracking groove, the open end of each first expansion gap faces to the end part of the first friction expansion sleeve, and the first arc-shaped anti-cracking grooves are distributed in the middle of the first friction expansion sleeve; at least two groups of second expansion gaps are uniformly distributed on the second friction expansion sleeve, one end of each second expansion gap is open and distributed, the other end of each second expansion gap is provided with a second arc-shaped anti-cracking groove, the open end of each second expansion gap faces to the end part of the second friction expansion sleeve, and the second arc-shaped anti-cracking grooves are distributed in the middle of the second friction expansion sleeve; the tightening section is provided with a limiting check ring which is connected with the end part of the second friction expansion sleeve in an abutting mode.
By adopting the technical scheme, the first expansion gap and the second expansion gap are arranged, so that the expansion of the first friction expansion sleeve and the second friction expansion sleeve by the tightening section of the screw rod is facilitated, and the expansion riveting effect is achieved; further, the first arc-shaped anti-cracking groove and the second arc-shaped anti-cracking groove are arranged, so that the first friction expansion sleeve and the second friction expansion sleeve are prevented from generating cracks during expansion, and the first friction expansion sleeve and the second friction expansion sleeve are promoted to expand along the designated direction; the limiting check ring is used for limiting the first friction expansion sleeve and the second friction expansion sleeve.
The high-strength double-expansion-sleeve type expansion anchor bolt for the fractured concrete can be further set as follows: the first friction expansion sleeve and the second friction expansion sleeve are distributed in mirror symmetry, the first arc-shaped anti-cracking groove and the second arc-shaped anti-cracking groove are arranged adjacently, the first expansion gap is distributed on one side close to the tightening section, and the second expansion gap is distributed on one side close to the threaded section.
Adopt above-mentioned technical scheme, first friction expansion cover, the two of second friction expansion cover is the symmetric distribution, expand the back with the two at the screw rod, first friction expansion cover and the two of second friction expansion cover and the mutual symmetric distribution of butt end of connecting hole inner wall, at this moment, no matter the expansion anchor bolt receives outside pulling force or the inboard pressure of orientation, the expansion anchor bolt can all produce relative butt-touch power with the connecting hole inner wall, thereby ensure that the expansion anchor bolt does not take place to shift after the installation, it is not hard up, higher joint strength has, excellent in use effect.
The high-strength double-expansion-sleeve type expansion anchor bolt for the fractured concrete can be further set as follows: the end part of the first friction expansion sleeve, which is close to the second friction expansion sleeve, is provided with a guide groove, and the end part of the second friction expansion sleeve, which is close to the second friction expansion sleeve, is provided with a guide block which can be embedded with the guide groove.
Adopt above-mentioned technical scheme, through setting up guide way and guide block, make the relative position of first friction expansion cover, the two of second friction expansion cover keep fixed, can not take place first friction expansion cover and the second friction expansion cover and cup joint, the two condition such as relative slip, ensure that the two circumstances of following the expectation of first friction expansion cover, second friction expansion cover expand.
The high-strength double-expansion-sleeve type expansion anchor bolt for the fractured concrete can be further set as follows: the end part of the first friction expansion sleeve is provided with a first abutting layer which is wavy, and the end part of the second friction expansion sleeve is provided with a second abutting layer which is wavy.
Adopt above-mentioned technical scheme, first butt layer is the wave fluctuation respectively with second butt layer, so expand respectively on first butt layer and second butt layer and expand to when contradicting with the connecting hole inner wall, increase the frictional force with the connecting hole inner wall, further promote the joint strength of expansion anchor bolt.
The high-strength double-expansion-sleeve type expansion anchor bolt for the fractured concrete can be further set as follows: the tightening section comprises a connecting column and a tightening body which is fixedly connected with the connecting column relatively, the first friction expansion sleeve and the second friction expansion sleeve are sequentially sleeved on the connecting column, the tightening body is hemispherical, and the longest radial value of the cross section of the tightening body is greater than the inner diameter values of the first friction expansion sleeve and the second friction expansion sleeve.
By adopting the technical scheme, the tightening body is hemispherical, the force transmitted by the screw rod is more in component force along the expansion direction of the first friction expansion sleeve, the first friction expansion sleeve is easier to expand, the labor-saving effect is achieved, the time for overcoming the self structural strength of the first friction expansion sleeve and easily expanding and deforming is shortened, and the installation efficiency is improved.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is an exploded view of a first embodiment of the present invention;
FIG. 2 is a schematic view of a first friction expansion sleeve according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a second friction expansion sleeve according to a first embodiment of the present invention;
FIG. 4 is a schematic top view illustrating a first embodiment of the present invention;
FIG. 5 is a schematic top view illustrating a second embodiment of the present invention;
fig. 6 is a schematic top view illustrating a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: as shown in fig. 1 to 4, double expansion sleeve type expansion anchor bolt of high strength for crack concrete includes screw rod 1, screw rod 1 is equipped with and distributes in the screw thread section 11 of one end, distributes in the section 12 that tightens up of the other end, screw rod 1 can be dismantled and be connected with the nut 2 that distributes in screw thread section 11, nut 2 is located and is equipped with the plain washer 3 of cover on screw rod 1 towards one side that tightens up section 12, screw rod 1 linkage has first friction expansion sleeve 4, the second friction expansion sleeve 5 that distributes in the section 12 that tightens up. Through setting up two sets of friction expansion cover, increase expansion anchor's riveting intensity, when the crack concrete receives the static load that the building oppression produced or the dynamic load that the earthquake arouses, expansion anchor is all applicable.
At least two groups of first expansion gaps 41 are uniformly distributed on the first friction expansion sleeve 4, one end of each first expansion gap 41 is open and distributed, the other end of each first expansion gap 41 is provided with a first arc-shaped anti-cracking groove 42, the open end of each first expansion gap 41 faces the end part of the first friction expansion sleeve 4, and the first arc-shaped anti-cracking grooves 42 are distributed in the middle of the first friction expansion sleeve 4; at least two groups of second expansion gaps 51 are uniformly distributed on the second friction expansion sleeve 5, one end of each second expansion gap 51 is open and distributed, the other end of each second expansion gap 51 is provided with a second arc-shaped anti-cracking groove 52, the open end of each second expansion gap 51 faces the end part of the second friction expansion sleeve 5, and the second arc-shaped anti-cracking grooves 52 are distributed in the middle of the second friction expansion sleeve 5; the tightening section 12 is provided with a limit retainer ring 121 which is connected with the end part of the second friction expansion sleeve 5 in an abutting mode. The first expansion notch 41 and the second expansion notch 51 are arranged, so that the first friction expansion sleeve 4 and the second friction expansion sleeve 5 can be expanded by the tightening section 12 of the screw 1, and the expansion riveting effect can be achieved; further, the first arc-shaped anti-cracking groove 42 and the second arc-shaped anti-cracking groove 52 are arranged, so that the first friction expansion sleeve 4 and the second friction expansion sleeve 5 are prevented from cracking while expanding, and the first friction expansion sleeve 4 and the second friction expansion sleeve 5 are promoted to expand along a specified direction; the limiting retainer ring 121 is used for limiting the first friction expansion sleeve 4 and the second friction expansion sleeve 5.
The first friction expansion sleeve 4 and the second friction expansion sleeve 5 are distributed in a mirror symmetry mode, the first arc-shaped anti-cracking groove 42 and the second arc-shaped anti-cracking groove 52 are arranged adjacently, the first expansion notch 41 is distributed on one side close to the tightening section 12, and the second expansion notch 51 is distributed on one side close to the threaded section 11. With first friction expansion cover 4, the two of second friction expansion cover 5 sets up to the symmetric distribution, expand the back with the two at screw rod 1, first friction expansion cover 4 and the mutual symmetric distribution of butt end of the two of second friction expansion cover 5 and connecting hole inner wall, at this moment, no matter the expansion anchor bolt receives outside pulling force or the inboard pressure of orientation, the expansion anchor bolt can all produce relative butt-touch power with the connecting hole inner wall, thereby ensure that the expansion anchor bolt does not take place to shift after the installation, it is not hard up, higher joint strength has, excellent in use effect.
The end part of the first friction expansion sleeve 4 close to the second friction expansion sleeve 5 is provided with a guide groove 43, and the end part of the second friction expansion sleeve 5 close to the second friction expansion sleeve 5 is provided with a guide block 53 which can be embedded with the guide groove 43. Through setting up guide way 43 and guide block 53, impel the relative position of first friction inflation cover 4, the two of second friction inflation cover 5 to keep fixed, can not take place first friction inflation cover 4 and the second friction inflation cover 5 cup joints, the two condition such as slide relatively, ensures that first friction inflation cover 4, the two of second friction inflation cover 5 expand along the condition of envisioning.
The end part of the first friction expansion sleeve 4 is provided with a first abutting layer 44 which is wavy, and the end part of the second friction expansion sleeve 5 is provided with a second abutting layer 54 which is wavy. When the first abutting layer 44 and the second abutting layer 54 expand respectively to collide with the inner wall of the connecting hole, the friction force with the inner wall of the connecting hole is increased, and the connection strength of the expansion anchor bolt is further improved.
The tightening section 12 comprises a connecting column 122 and a tightening body 123 fixedly connected with the connecting column 122 relatively, the connecting column 122 is sequentially sleeved with the first friction expansion sleeve 4 and the second friction expansion sleeve 5, the tightening body 123 is hemispherical, and the longest radial value of the cross section of the tightening body 123 is greater than the inner diameter values of the first friction expansion sleeve 4 and the second friction expansion sleeve 5. The tightening body 123 is hemispherical, so that the force transmitted by the screw rod 1 is more than the component force in the expansion direction of the first friction expansion sleeve 4, the first friction expansion sleeve 4 is easier to expand, the labor-saving effect is achieved, the time for overcoming the self structural strength of the first friction expansion sleeve 4 and easily expanding and deforming is shortened, and the installation efficiency is improved.
Example two: as shown in fig. 5, the difference from the first embodiment is mainly the installation manner of the first friction expansion sleeve 4 and the second friction expansion sleeve 5, wherein the open ends of the first expansion notch 41 and the second expansion notch 51 are oriented in the same direction, and the guide groove 43 and the guide block 53 are not arranged between the first friction expansion sleeve 4 and the second friction expansion sleeve 5 in the second embodiment, when the expansion anchor bolt is installed in this assembled state, the second friction expansion sleeve 5 needs to be expanded after the first friction expansion sleeve 4 is expanded, the assembly time is prolonged compared with the first embodiment, and the second embodiment can mainly resist the pulling force towards the outside of the installation hole, the connection strength is greatly improved compared with the prior art, but is slightly smaller than that of the first embodiment.
Example three: as shown in fig. 6, compared with the first embodiment, the difference is that no guide groove 43 and no guide block 53 are provided between the first friction expansion sleeve 4 and the second friction expansion sleeve 5, and at this time, when the expansion anchor bolt is installed, relative rotation is likely to occur between the first friction expansion sleeve 4 and the second friction expansion sleeve 5.
Claims (6)
1. Two expansion sleeve type expansion anchor of high strength for crack concrete, including the screw rod, the screw rod is equipped with and distributes in the screw thread section of one end, distributes in the section of tightening up of the other end, the screw rod can be dismantled and be connected with the nut of distributing in the screw thread section, the nut is located and is equipped with the plain washer of cover on locating the screw rod towards one side of tightening up the section, its characterized in that: the screw rod is linked with a first friction expansion sleeve and a second friction expansion sleeve which are distributed on the tightening section.
2. A high-strength double-expansion-sleeve-type expansion anchor for a fractured concrete according to claim 1, wherein: at least two groups of first expansion gaps are uniformly distributed on the first friction expansion sleeve, one end of each first expansion gap is open and distributed, the other end of each first expansion gap is provided with a first arc-shaped anti-cracking groove, the open end of each first expansion gap faces to the end part of the first friction expansion sleeve, and the first arc-shaped anti-cracking grooves are distributed in the middle of the first friction expansion sleeve; at least two groups of second expansion gaps are uniformly distributed on the second friction expansion sleeve, one end of each second expansion gap is open and distributed, the other end of each second expansion gap is provided with a second arc-shaped anti-cracking groove, the open end of each second expansion gap faces to the end part of the second friction expansion sleeve, and the second arc-shaped anti-cracking grooves are distributed in the middle of the second friction expansion sleeve; the tightening section is provided with a limiting check ring which is connected with the end part of the second friction expansion sleeve in an abutting mode.
3. The high-strength double-expansion-sleeve-type expansion anchor for fractured concrete according to claim 2, wherein: the first friction expansion sleeve and the second friction expansion sleeve are distributed in mirror symmetry, the first arc-shaped anti-cracking groove and the second arc-shaped anti-cracking groove are arranged adjacently, the first expansion gap is distributed on one side close to the tightening section, and the second expansion gap is distributed on one side close to the threaded section.
4. A high-strength double-expansion-sleeve-type expansion anchor for fractured concrete according to claim 3, wherein: the end part of the first friction expansion sleeve, which is close to the second friction expansion sleeve, is provided with a guide groove, and the end part of the second friction expansion sleeve, which is close to the second friction expansion sleeve, is provided with a guide block which can be embedded with the guide groove.
5. A high-strength double-expansion-sleeve-type expansion anchor for fractured concrete according to claim 1, 2 or 3, wherein: the end part of the first friction expansion sleeve is provided with a first abutting layer which is wavy, and the end part of the second friction expansion sleeve is provided with a second abutting layer which is wavy.
6. A high-strength double-expansion-sleeve-type expansion anchor for fractured concrete according to claim 1, 2 or 3, wherein: the tightening section comprises a connecting column and a tightening body which is fixedly connected with the connecting column relatively, the first friction expansion sleeve and the second friction expansion sleeve are sequentially sleeved on the connecting column, the tightening body is hemispherical, and the longest radial value of the cross section of the tightening body is greater than the inner diameter values of the first friction expansion sleeve and the second friction expansion sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111120760.2A CN113847316A (en) | 2021-09-24 | 2021-09-24 | High-strength double-expansion sleeve type expansion anchor bolt for crack concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111120760.2A CN113847316A (en) | 2021-09-24 | 2021-09-24 | High-strength double-expansion sleeve type expansion anchor bolt for crack concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113847316A true CN113847316A (en) | 2021-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111120760.2A Pending CN113847316A (en) | 2021-09-24 | 2021-09-24 | High-strength double-expansion sleeve type expansion anchor bolt for crack concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113847316A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE431367B (en) * | 1972-10-11 | 1984-01-30 | Heinrich Liebig | DOUBLE EXPANDING PLUG |
| CN2512933Y (en) * | 2002-01-14 | 2002-09-25 | 中国建筑科学研究院 | Double cone building anchor bolt |
| CN2623929Y (en) * | 2003-01-27 | 2004-07-07 | 富崇民 | Two-way expansion bolt |
| WO2004072495A1 (en) * | 2003-02-13 | 2004-08-26 | Liebig Gmbh & Co. Kg | Undercutting anchor that can be seated with positive engagement |
| CN102052373A (en) * | 2009-10-27 | 2011-05-11 | 中国建筑科学研究院 | Nested tooth surface expansion pipe type expansion anchor bolt |
| CN103256282A (en) * | 2013-05-10 | 2013-08-21 | 杨小龙 | Anchor-type fixing screw |
| CN204267465U (en) * | 2014-10-31 | 2015-04-15 | 上海国锐紧固件有限公司 | A kind of novel nine point type expansion anchors |
| CN107956777A (en) * | 2017-11-17 | 2018-04-24 | 黄传勇 | A kind of polycyclic pull explosive screw |
| CN111255785A (en) * | 2019-12-11 | 2020-06-09 | 浙江航鑫支吊架有限公司 | Expansion anchor bolt for up-down double expansion of anti-seismic bracket and manufacturing method |
| CN213088432U (en) * | 2020-08-21 | 2021-04-30 | 郑爱龙 | Expansion anchor bolt |
-
2021
- 2021-09-24 CN CN202111120760.2A patent/CN113847316A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE431367B (en) * | 1972-10-11 | 1984-01-30 | Heinrich Liebig | DOUBLE EXPANDING PLUG |
| CN2512933Y (en) * | 2002-01-14 | 2002-09-25 | 中国建筑科学研究院 | Double cone building anchor bolt |
| CN2623929Y (en) * | 2003-01-27 | 2004-07-07 | 富崇民 | Two-way expansion bolt |
| WO2004072495A1 (en) * | 2003-02-13 | 2004-08-26 | Liebig Gmbh & Co. Kg | Undercutting anchor that can be seated with positive engagement |
| CN102052373A (en) * | 2009-10-27 | 2011-05-11 | 中国建筑科学研究院 | Nested tooth surface expansion pipe type expansion anchor bolt |
| CN103256282A (en) * | 2013-05-10 | 2013-08-21 | 杨小龙 | Anchor-type fixing screw |
| CN204267465U (en) * | 2014-10-31 | 2015-04-15 | 上海国锐紧固件有限公司 | A kind of novel nine point type expansion anchors |
| CN107956777A (en) * | 2017-11-17 | 2018-04-24 | 黄传勇 | A kind of polycyclic pull explosive screw |
| CN111255785A (en) * | 2019-12-11 | 2020-06-09 | 浙江航鑫支吊架有限公司 | Expansion anchor bolt for up-down double expansion of anti-seismic bracket and manufacturing method |
| CN213088432U (en) * | 2020-08-21 | 2021-04-30 | 郑爱龙 | Expansion anchor bolt |
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Application publication date: 20211228 |