CN114893235B - Hollow scalelike grouting double-expansion anchor rod for crushing area - Google Patents
Hollow scalelike grouting double-expansion anchor rod for crushing area Download PDFInfo
- Publication number
- CN114893235B CN114893235B CN202210462422.5A CN202210462422A CN114893235B CN 114893235 B CN114893235 B CN 114893235B CN 202210462422 A CN202210462422 A CN 202210462422A CN 114893235 B CN114893235 B CN 114893235B
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- Prior art keywords
- expansion
- anchor rod
- grouting
- double
- pipe
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0073—Anchoring-bolts having an inflatable sleeve, e.g. hollow sleeve expanded by a fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention relates to a hollow fish scale-shaped grouting double-expansion anchor rod for a crushing area, which comprises an anchor rod sleeve and a grouting pipe, wherein the anchor rod sleeve is sleeved outside the grouting pipe, and an external thread is arranged on the peripheral side of the grouting pipe; the anchor rod sleeve comprises three base pipe sections with equal length which are sequentially connected, the adjacent base pipe sections are connected through double expansion pipe sections, and the end part of the base pipe section at the head end is connected with the double expansion pipe section; the pipe wall of the base pipe section is sequentially provided with a plurality of layers of fish scales along the axial direction, each layer comprises a plurality of fish scales at the local circumference, the fish scales are accommodated and covered in the holes formed in the base pipe section, and only the head ends of the fish scales are connected with the base pipe section; this design has increased the area of contact with broken country rock through two expanded pipe sections, fish scale, and increase frictional force strengthens the anchor effect, improves the anchor power, and the thick liquid fills the clearance of fish scale, two expanded pipe sections and broken area rock department via the hole and the two expanded pipe sections at fish scale position, forms outer slip casting body, can make whole broken district more stable.
Description
Technical Field
The invention relates to the field of anchor rod sleeve supporting engineering in a crushing area, in particular to a hollow scaly grouting double-expansion anchor rod for the crushing area.
Background
The anchor sleeve support is a reinforcing mode for earth surface engineering such as side slopes, rock and soil foundation pits and underground roadways. The anchor rod mainly comprises a metal inverted wedge type anchor rod sleeve, a mortar anchor rod sleeve, a pipe seam type anchor rod sleeve, a resin anchor rod sleeve and the like. However, under natural conditions and during human development, the construction area is very easy to break. The existing anchor rod sleeve such as a pipe seam type anchor rod sleeve is used as a novel anchor rod sleeve for full-length anchoring and actively reinforcing surrounding rock, the three-dimensional part of the anchor rod sleeve is a high-strength steel pipe which is longitudinally slotted, when the anchor rod sleeve is installed in a drill hole with a diameter smaller than the pipe diameter, radial pressure can be immediately applied to the hole wall in the full-length range, friction force for preventing the surrounding rock from sliding downwards is prevented, and bearing force of a tray supporting plate of the anchor rod sleeve is added, so that the surrounding rock is in a three-dimensional stress state, and rock stratum stability is realized. During the installation, need install with hydraulic hammer or other external force, this tube seam formula stock cover has following two major comparatively apparent shortcomings: first, because the stability that the country rock was realized to whole anchor of tube slot formula stock cover, it is not high to broken regional practicality, higher to the requirement of drilling in the installation, if the rock migration appears in the drilling skew or hole takes place among the drilling process, can take place unable installation or can't install reasonable position. Secondly, due to the full-length anchoring, particularly in a broken area, when blasting vibration causes the surrounding rock to move, the anchoring force of the pipe seam type anchor rod sleeve is further reduced, and long-time circulating vibration causes instability of a supporting area. The mortar anchor rod sleeve can improve the strength of the mortar anchor rod sleeve through grouting, but the anchor rod sleeve is weak in anchoring force and is mostly used in areas with complete rock structures. Therefore, the existing anchor rod sleeve cannot meet the requirements on the strength and stability of the support in the crushing area.
Disclosure of Invention
Aiming at the defects, the invention provides the hollow fish scale-shaped grouting double-expansion type anchor rod for the crushing area.
The invention solves the technical problem by adopting the scheme that the hollow fish-scale grouting double-expansion anchor rod for the crushing area comprises an anchor rod sleeve and a grouting pipe, wherein the anchor rod sleeve is sleeved outside the grouting pipe, and the outer peripheral side of the grouting pipe is provided with an external thread;
the anchor rod sleeve is a hollow steel pipe, the hollow steel pipe comprises three equal-length base pipe sections which are sequentially connected, adjacent base pipe sections are connected through double expansion pipe sections, and the end part of the base pipe section at the head end is connected with the double expansion pipe section;
a plurality of layers of fish scales are sequentially arranged on the pipe wall of at least the head end and the middle base pipe section of the three base pipe sections along the axial direction, each layer comprises a plurality of fish scales at the local circumference, the fish scales are accommodated and covered in holes formed in the base pipe sections, and only the head ends of the fish scales are connected with the base pipe sections;
the double-expansion pipe section comprises a head sleeve, a first expansion part, a middle sleeve, a second expansion part and a tail sleeve which are sequentially connected, the inner wall of the head sleeve is in threaded fit with the grouting pipe, the first expansion part comprises a plurality of first expansion pieces which are uniformly distributed on the circumference, and the second expansion part comprises a plurality of second expansion pieces which are uniformly distributed on the circumference.
Further, the method comprises the following steps: the fish scales of adjacent layers on the same base pipe section are arranged in a staggered mode.
Furthermore, the first expansion sheet and the second expansion sheet are both made of thin-layer steel plates, the first expansion sheet and the second expansion sheet are arranged in a staggered mode, and the middle portions of the first expansion sheet and the second expansion sheet are thinner than other portions of the first expansion sheet and the second expansion sheet.
Further, the tail end of the anchor rod sleeve is sleeved with a tray, a perforated metal sheet is arranged in the center of the tray, a round nut is arranged in a perforated hole of the tray and is in threaded connection with the tail end of the anchor rod sleeve, and the tray can facilitate installation of the anchor rod and provide certain bearing force.
Furthermore, the end part of the double-expansion pipe section at the head end is connected with an anchor head.
Furthermore, the inner wall of the tail end sleeve is in threaded fit with the grouting pipe, and the spiral directions of the tail end sleeve and the head end sleeve are opposite.
A method of bolting a zone to a fracture comprising the steps of:
the method comprises the following steps: according to engineering design, calibrating and preprocessing a calibrated crushing area;
step two: installing a hollow scaly grouting double expansion type anchor rod at a broken part needing anchor rod supporting by using a hydraulic hammer or other external force;
step three: checking whether the anchor rod is installed to a specified position or not and the stability condition of the anchor rod;
step four: pushing a grouting pipe edge in the hollow fish scale-shaped grouting double-expansion anchor rod to reach a designated position by using a high-speed screw machine, so that a first expansion sheet and a second expansion sheet of a double-expansion pipe section are deformed and inserted into a crushing area;
step five: high-pressure grouting is carried out through a grouting pipe in a hollow scaly grouting double-expansion anchor rod, at the moment, the shallow closed fish scales slightly open a hole due to the pressure of slurry, the slurry is contacted with rocks in a crushing area through the hole and a gap at the double-expansion pipe section, the slurry is diffused by taking the opened fish scales, the deformed first expansion pieces and the deformed second expansion pieces as fulcrums and is gradually connected with surrounding rock broken stones into a whole, a basic framework with four-in-one functions of the anchor rod, the fish scales, the first expansion pieces and the second expansion pieces and the broken stones is formed, and the overall stability of the crushing area is improved;
step six: after grouting, a tray is arranged at the tail end of the anchor rod to lock the anchor rod, and the anchor rod is installed after grouting and solidification.
Compared with the prior art, the invention has the following beneficial effects: simple structure, reasonable in design, through two expansion pipe sections, the flake has increased the area of contact with broken country rock, increase frictional force, strengthen the anchor effect, improve the anchor power, the thick liquid fills the flake via the hole at flake position and two expansion pipe sections, the clearance of two expansion pipe sections and broken area rock department, form outer grout body, can make whole broken district more stable, and then promote the steadiness of strutting regional rock mass, alleviate the problem that the stock anchoring power that results in that the blasting vibrations descends, improve the security that the stock was strutted.
Drawings
The invention is further described with reference to the following figures.
Fig. 1 is a schematic structural view of a sleeve of an anchor rod.
Fig. 2 is a schematic view of the anchoring expanded state.
In the figure: 1-anchor rod sleeve; 2-grouting pipe; 3-breaking zone rock; 11-a tray; 12-a base segment; 13-fish scale; 14-tail end sleeve; 15-a second expansion; 16-an intermediate sleeve; 17-a first expansion; 18-head end sleeve; 19-hole.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1-2, a hollow fish scale-shaped grouting double-expansion type anchor rod for a crushing area comprises an anchor rod sleeve 1 and a grouting pipe 2, wherein the anchor rod sleeve is sleeved outside the grouting pipe, and the outer peripheral side of the grouting pipe is provided with an external thread;
the anchor rod sleeve is a hollow steel pipe, the hollow steel pipe comprises three equal-length base pipe sections 12 which are sequentially connected, adjacent base pipe sections are connected through double expansion pipe sections, and the end part of the base pipe section at the head end is connected with the double expansion pipe section;
the base pipe comprises three base pipe sections, wherein at least the pipe wall of the base pipe section at the head end and the middle of the three base pipe sections is sequentially provided with a plurality of layers of fish scales 13 along the axial direction, each layer comprises a plurality of fish scales at the local circumference, the fish scales are accommodated and covered in holes 19 formed in the base pipe sections, only the head ends of the fish scales are connected with the base pipe sections, when the anchor rod is used, the head end of the anchor rod is a driving end, the opening direction of the fish scales is the same as the mounting and feeding direction of the anchor rod, and the slipping direction of the anchor rod is opposite to the slipping direction of the anchor rod, so that the loss of fish scales during the mounting of the anchor rod can be effectively avoided, and the anchoring force of the anchor rod is increased;
the double-expansion pipe section comprises a head end sleeve 18, a first expansion part 17, a middle sleeve 16, a second expansion part 15 and a tail end sleeve 14 which are sequentially connected, the inner wall of the head end sleeve is in threaded fit with the grouting pipe, the first expansion part comprises a plurality of first expansion pieces which are uniformly distributed on the circumference, and the second expansion part comprises a plurality of second expansion pieces which are uniformly distributed on the circumference;
become the expanded state by the shrink through three two expansion pipe sections during the use, increased the area of contact with broken country rock, increase frictional force, assist with the hollow fish scale solution of crisscross arrangement at broken regional anchor bolt support in-process not enough problem of frictional force, at broken area anchor bar support in-process thick liquid via the slip casting pipe send to each two expansion pipe sections and flake, thick liquid fills barb and broken area rock clearance, can improve the integrality of rock mass, consolidate the country rock, it is good to disorderly stress field suitability, the obturator uses two expansion pipe sections and flake as the frame muscle respectively, the frame muscle is through slip casting and broken district rock formation globular slip casting body, can make whole broken district more stable, and then promote the steadiness of rock mass, alleviate the problem that the stock anchoring force that blasting vibrations lead to the decline to a certain extent, anchor bar support's security improves.
In this embodiment, the fish scales of adjacent layers on the same base pipe section are staggered.
In this embodiment, the first expansion sheet and the second expansion sheet are both made of thin steel plates, the first expansion sheet and the second expansion sheet are arranged in a staggered manner, and the middle portions of the first expansion sheet and the second expansion sheet are thinner than other portions of the first expansion sheet and the second expansion sheet.
In this embodiment, the tail end of the anchor rod sleeve is sleeved with a tray 11, a perforated metal sheet is arranged in the center of the tray, a circular nut is arranged in the tray perforation, and the circular nut is in threaded connection with the tail end of the anchor rod sleeve.
In this embodiment, the anchor head is connected to the end of the double expansion pipe section at the head end.
In this embodiment, the inner wall of the tail end sleeve is in threaded fit with the grouting pipe, and the spiral directions of the tail end sleeve and the head end sleeve are opposite.
A method of bolting a zone to a fracture comprising the steps of:
the method comprises the following steps: according to the engineering design, calibrating and preprocessing a calibrated crushing area;
step two: installing a hollow scalelike grouting double-expansion anchor rod at a broken part needing anchor rod supporting by using a hydraulic hammer or other external force;
step three: checking whether the anchor rod is installed to a specified position or not and the stability condition of the anchor rod;
step four: pushing a grouting pipe edge in the hollow fish scale-shaped grouting double-expansion anchor rod to reach a designated position by using a high-speed screw machine, so that a first expansion sheet and a second expansion sheet of a double-expansion pipe section are deformed and inserted into a crushing area;
step five: high-pressure grouting is carried out through a grouting pipe in the hollow scaly grouting double-expansion anchor rod, at the moment, each shallow closed fish scale slightly opens a hole due to the pressure of slurry, the slurry is contacted with a rock 3 in a crushing area through the hole and a gap at the double-expansion pipe section, the slurry is diffused by taking the opened fish scale, a first expansion sheet and a second expansion sheet after deformation as fulcrums and is gradually connected with surrounding rocks into a whole, a basic framework integrating four parts of anchor rod-fish scale-first expansion sheet and second expansion sheet-broken stone is formed, and the overall stability of the crushing area is improved;
step six: after grouting, a tray is arranged at the tail end of the anchor rod to lock the anchor rod, and the anchor rod is installed after grouting and solidification.
If this patent discloses or refers to parts or structures that are fixedly connected to each other, the fixedly connected may be understood as: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A hollow fish scaly slip casting double expansion formula stock for broken region which characterized in that: the anchor rod sleeve is sleeved outside the grouting pipe, and external threads are arranged on the peripheral side of the grouting pipe;
the anchor rod sleeve is a hollow steel pipe, the hollow steel pipe comprises three equal-length base pipe sections which are sequentially connected, adjacent base pipe sections are connected through double expansion pipe sections, and the end part of the base pipe section at the head end is connected with the double expansion pipe section;
a plurality of layers of fish scales are sequentially arranged on the pipe wall of at least the head end and the middle base pipe section of the three base pipe sections along the axial direction, each layer comprises a plurality of fish scales at the local circumference, the fish scales are accommodated and covered in holes formed in the base pipe sections, and only the head ends of the fish scales are connected with the base pipe sections;
the double-expansion pipe section comprises a head sleeve, a first expansion part, a middle sleeve, a second expansion part and a tail sleeve which are sequentially connected, the inner wall of the head sleeve is in threaded fit with the grouting pipe, the first expansion part comprises a plurality of first expansion pieces which are uniformly distributed in the circumference, and the second expansion part comprises a plurality of second expansion pieces which are uniformly distributed in the circumference.
2. The hollow fish scale-shaped grouting dual expansion anchor for a crush zone of claim 1, wherein: the fish scales of adjacent layers on the same base pipe section are arranged in a staggered mode.
3. The hollow fish scale grouting double expansion anchor for a crush zone of claim 1, wherein: the first expansion sheet and the second expansion sheet are both made of thin-layer steel plates and are arranged in a staggered mode, and the middle portions of the first expansion sheet and the second expansion sheet are thinner than other portions of the first expansion sheet and the second expansion sheet.
4. The hollow fish scale-shaped grouting dual expansion anchor for a crush zone of claim 1, wherein: the anchor rod sleeve tail end sleeve is provided with a tray, a perforated metal sheet is arranged in the center of the tray, a round nut is arranged in a perforated hole of the tray, and the round nut is in threaded connection with the anchor rod sleeve tail end.
5. The hollow fish scale-shaped grouting double expansion bolt for a fractured region according to any one of claims 1 to 4, characterized in that: the end part of the double-expansion pipe section positioned at the head end is connected with an anchor head.
6. The hollow fish scale-shaped grouting double expansion bolt for a fractured region according to any one of claims 1 to 4, characterized in that: the inner wall of the tail end sleeve is in threaded fit with the grouting pipe, and the spiral directions of the tail end sleeve and the head end sleeve are opposite.
7. A fragmentation zone bolting method using a hollow fish-scale grouting double expansion bolt for a fragmentation zone according to claim 1, characterised by the steps of:
the method comprises the following steps: according to engineering design, calibrating and preprocessing a calibrated crushing area;
step two: installing a hollow scaly grouting double expansion type anchor rod at a broken part needing anchor rod supporting by using a hydraulic hammer or other external force;
step three: checking whether the anchor rod is installed to a specified position or not and the stability condition of the anchor rod;
step four: pushing a grouting pipe edge in the hollow fish scale-shaped grouting double-expansion anchor rod to reach a designated position by using a high-speed screw machine, so that a first expansion sheet and a second expansion sheet of a double-expansion pipe section are deformed and inserted into a crushing area;
step five: high-pressure grouting is carried out through a grouting pipe in a hollow scaly grouting double-expansion anchor rod, at the moment, the shallow closed fish scales slightly open a hole due to the pressure of slurry, the slurry is contacted with rocks in a crushing area through the hole and a gap at the double-expansion pipe section, the slurry is diffused by taking the opened fish scales, the deformed first expansion pieces and the deformed second expansion pieces as fulcrums and is gradually connected with surrounding rock broken stones into a whole, a basic framework with four-in-one functions of the anchor rod, the fish scales, the first expansion pieces and the second expansion pieces and the broken stones is formed, and the overall stability of the crushing area is improved;
step six: after grouting, a tray is arranged at the tail end of the anchor rod to lock the anchor rod, and the anchor rod is installed after grouting and solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210462422.5A CN114893235B (en) | 2022-04-29 | 2022-04-29 | Hollow scalelike grouting double-expansion anchor rod for crushing area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210462422.5A CN114893235B (en) | 2022-04-29 | 2022-04-29 | Hollow scalelike grouting double-expansion anchor rod for crushing area |
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| Publication Number | Publication Date |
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| CN114893235A CN114893235A (en) | 2022-08-12 |
| CN114893235B true CN114893235B (en) | 2023-02-10 |
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| CN202210462422.5A Active CN114893235B (en) | 2022-04-29 | 2022-04-29 | Hollow scalelike grouting double-expansion anchor rod for crushing area |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2723681Y (en) * | 2004-09-03 | 2005-09-07 | 蒋敬平 | Inner anchor external injection type anchor rod |
| CN102877867A (en) * | 2012-09-26 | 2013-01-16 | 山东科技大学 | Novel inflatable yielding pre-stress grouting anchor rod and usage method thereof |
| CN102900447A (en) * | 2012-10-30 | 2013-01-30 | 中铁五局集团贵州工程有限公司 | Anchor rod used for reinforcing weak surrounding rock |
| CN203809026U (en) * | 2014-02-17 | 2014-09-03 | 济南力稳岩土工程有限公司 | High-pre-anchoring-force, iso-intensity and high-resistance grouting anchor rod |
| CN206376889U (en) * | 2016-12-15 | 2017-08-04 | 山东科技大学 | A kind of new scale formula grouted anchor bar |
| CN109057840A (en) * | 2018-08-20 | 2018-12-21 | 中钢集团马鞍山矿山研究院有限公司 | Adaptive grouting and reinforcing anchor pole and its anchoring construction method under a kind of high stress |
| CN109083668A (en) * | 2018-08-20 | 2018-12-25 | 中钢集团马鞍山矿山研究院有限公司 | A kind of grouting and reinforcing anchor pole suitable for high stress breaking surrounding rock supporting |
| CN110259494A (en) * | 2019-06-18 | 2019-09-20 | 山东科技大学 | A kind of spiral tooth type suppression tube expansion and its application method |
| CN112762072A (en) * | 2021-02-06 | 2021-05-07 | 济南得德环保科技有限公司 | Quick detachable and repeatedly usable's expansion bolts |
-
2022
- 2022-04-29 CN CN202210462422.5A patent/CN114893235B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2723681Y (en) * | 2004-09-03 | 2005-09-07 | 蒋敬平 | Inner anchor external injection type anchor rod |
| CN102877867A (en) * | 2012-09-26 | 2013-01-16 | 山东科技大学 | Novel inflatable yielding pre-stress grouting anchor rod and usage method thereof |
| CN102900447A (en) * | 2012-10-30 | 2013-01-30 | 中铁五局集团贵州工程有限公司 | Anchor rod used for reinforcing weak surrounding rock |
| CN203809026U (en) * | 2014-02-17 | 2014-09-03 | 济南力稳岩土工程有限公司 | High-pre-anchoring-force, iso-intensity and high-resistance grouting anchor rod |
| CN206376889U (en) * | 2016-12-15 | 2017-08-04 | 山东科技大学 | A kind of new scale formula grouted anchor bar |
| CN109057840A (en) * | 2018-08-20 | 2018-12-21 | 中钢集团马鞍山矿山研究院有限公司 | Adaptive grouting and reinforcing anchor pole and its anchoring construction method under a kind of high stress |
| CN109083668A (en) * | 2018-08-20 | 2018-12-25 | 中钢集团马鞍山矿山研究院有限公司 | A kind of grouting and reinforcing anchor pole suitable for high stress breaking surrounding rock supporting |
| CN110259494A (en) * | 2019-06-18 | 2019-09-20 | 山东科技大学 | A kind of spiral tooth type suppression tube expansion and its application method |
| CN112762072A (en) * | 2021-02-06 | 2021-05-07 | 济南得德环保科技有限公司 | Quick detachable and repeatedly usable's expansion bolts |
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| Publication number | Publication date |
|---|---|
| CN114893235A (en) | 2022-08-12 |
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