CN111676968A - Reinforced anti-floating anchor rod construction structure and construction process - Google Patents
Reinforced anti-floating anchor rod construction structure and construction process Download PDFInfo
- Publication number
- CN111676968A CN111676968A CN202010655893.9A CN202010655893A CN111676968A CN 111676968 A CN111676968 A CN 111676968A CN 202010655893 A CN202010655893 A CN 202010655893A CN 111676968 A CN111676968 A CN 111676968A
- Authority
- CN
- China
- Prior art keywords
- column
- rod
- outer pipe
- baffle
- anchor rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Abstract
The invention discloses a construction structure and a construction process of a reinforced anti-floating anchor rod, which solve the problems that the existing anchor rod has limited expanding length and is not beneficial to use under the condition of rich water, and comprises an outer pipe and a core column arranged in the outer pipe, the core column comprises a central column and a plurality of side columns, a positioning plate is arranged in the inner cavity of the outer tube, a through hole is arranged on the positioning plate, the core column penetrates through the positioning plate to prevent the core column from shaking, a baffle plate and a bottom plate are arranged below the core column, the bottom plate is positioned at the bottom end of the central column, the baffle plate is positioned above the bottom plate, the lower end of the side column is hinged with a head expanding rod, the head expanding rods are connected through a connecting piece, the lower end of the head expanding rod is in contact with the edge of the baffle, the lower end of the outer pipe is provided with a groove body, and the head expanding rod can be unfolded from the groove body. The invention has the advantages that the requirement of the expansion inside the anchor rod on the operation space is low, and the high drawing resistance can be kept for a long time under the condition of rich water, and the like.
Description
Technical Field
The invention relates to the technical field of building anchoring, in particular to a construction structure and a construction process of a reinforced anti-floating anchor rod.
Background
Along with the reduction of urban construction land, people are more and more applied to low areas, such as subways, low garages, underground shopping malls and the like, and when underground construction is carried out, the problem of anchoring of a building is often met, the anchoring is an important link of building stability, the stability of the anchor rod directly influences the stability of the whole building, and especially for some water-rich underground environments, the requirements on the structure and the stability of the anchor rod are higher.
The existing anchor rod mostly adopts a head-expanding anchor rod to increase the stability of the anchor rod and a foundation, in the existing head-expanding structure, the length of the head-expanding is limited, and in a water-rich area, the anchor rod is easy to be wetted for a long time to influence the strength of the anchor rod, so that the structure and the construction method of the anchor rod need to be further improved, and the anchoring property of the anchor rod needs to be further improved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing anchor rod has limited expanding head length and is not beneficial to being used under the condition of rich water.
The invention is realized by the following technical scheme:
reinforced anti-floating anchor rod construction structures, be in including outer tube and setting stem in the outer tube, the stem includes center post and a plurality of side post, be provided with the locating plate in the inner chamber of outer tube, be provided with the through-hole on the locating plate, the stem passes the locating plate prevents that the stem from rocking, the below of center post is provided with baffle and bottom plate, the bottom plate is located the bottom of center post, the baffle is located the top of bottom plate, the lower extreme of side post articulates there is the flaring pole, and is a plurality of the flaring pole passes through the connecting piece and connects, the lower extreme of flaring pole with the border contact of baffle, the lower extreme of outer tube is provided with the cell body, the flaring pole can follow expand in the cell body.
The design principle of the invention is as follows: through set up the structure of expanding the head in the stock inside, when reacing the stock hole bottom, open the structure of expanding the head from the stock inside, can reduce the operating space in stock hole like this, can do the extension portion of expanding the head longer moreover, increase the tensile resistance of pulling out of stock, in order to expand the head smoothly, set up the cell body at the lower extreme of outer tube, be convenient for expand the head pole and stretch out the outer tube and expand.
According to the preferable reinforced anti-floating anchor rod construction structure, the second groove is formed in the edge of the baffle, and the expanding head rod is correspondingly limited in the second groove.
Therefore, in the process that the side column moves downwards, the expanding head rod can extend towards the outer part of the outer pipe along the second groove to open the expanding head structure, and the deviation generated in the downward moving process can be effectively prevented.
According to the preferable reinforced anti-floating anchor rod construction structure, the post sleeve is arranged outside the central post and is in threaded connection with the central post, the baffle plate is arranged at the bottom of the post sleeve, the central post is rotated, and the post sleeve can move up and down along the central post.
After the head expanding rod is unfolded, the column sleeve is rotated to move upwards so as to drive the baffle to move upwards until the baffle abuts against the upper edge of the groove body.
According to the preferable reinforced anti-floating anchor rod construction structure, the lower end of the outer pipe is provided with the step, and the diameter of the baffle is larger than the inner diameter of the outer pipe and smaller than the outer diameter of the outer pipe.
The size of the baffle plate is set so that the baffle plate can be limited at the step in the process of moving upwards along with the column sleeve.
According to the preferable reinforced anti-floating anchor rod construction structure, the head expanding rod is provided with the water stopping rubber sleeve in a sleeved mode.
The anchor reinforcing part of the anchor rod structure is just in the expanding structure, when the underground environment is a water-rich environment, if the anchor rod and the inner core column are in a wet environment for a long time, the anchor rod and the inner core column can be corroded, and the anti-pulling performance of the anchor rod is weakened.
The construction process of the reinforced anti-floating anchor rod construction structure comprises the following steps:
step 1: firstly, drilling a T-shaped anchor hole, and arranging a first groove capable of accommodating a bottom plate in a horizontal cavity of the T-shaped anchor hole;
step 2: inserting an anchor rod into the anchor hole and placing the base plate in the first groove;
and step 3: applying pressure to the side columns by using the sleeves, so that the side columns move downwards and extend outwards of the outer pipes to be gradually expanded under the supporting action of the baffle plates;
and 4, step 4: after the expanding structure is expanded, the column sleeve is rotated, so that the column sleeve drives the baffle to move upwards until the side column is contacted with the top of the groove body.
And 5: injecting paddles outside the outer pipe;
step 6: embedding reinforcing ribs into the gaps of the inner cavity of the outer pipe;
and 7: the anchor rods are connected with the bottom plate of the building.
During construction, the anchor hole comprises a T-shaped groove, the large end of the T-shaped groove is used for accommodating an expanded expanding head structure, the large end is also provided with a first groove, the first groove is used for accommodating a bottom plate, the bottom plate, a groove body and an external anchor hole are communicated according to the above description before grouting, and a baffle and an expanding rod block an inner cavity of an outer pipe, so that slurry can enter the bottom of the outer pipe along the groove body and fill the first groove, the bottom plate is compacted in the first groove to play a role of primary anchoring reinforcement, the expanding rod is submerged as the slurry gradually rises, the expanding rod plays a role of secondary anchoring reinforcement, the whole anchor hole is finally filled, and the reinforcing rib is further embedded into the inner cavity of the outer pipe to further improve the strength of the anchor rod.
In a water-rich environment, the water-stopping rubber is sleeved on the head expanding rod, so that the water-stopping rubber can expand in a water environment to block a gap between the head expanding rod and the top of the groove body, water is prevented from entering the upper end of the inner cavity of the outer pipe from the groove body, the reinforcing ribs and the core column are prevented from being corroded, the damage effect of water on the anchor rod is reduced, and the long-term effectiveness of the anchor rod is maintained.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the structure of the invention comprises a primary reinforced anchoring structure formed by the bottom plate and a secondary reinforced anchoring structure formed by the head expanding rod, and after grouting, the anchoring reinforcing structure and slurry are integrated into a whole, so that the anti-pulling performance of the anchor rod is better.
2. The water-stopping rubber is sleeved on the flaring rod, the gap between the groove body of the outer pipe and the flaring rod is sealed by the water-stopping rubber, and when water is met, the sealing performance is further improved, so that water cannot enter the upper part of the inner cavity of the outer pipe, the corrosion of the water to the hinging part of the flaring rod, the reinforcing rib and the upper core column is reduced, and the stability of the anchor rod is ensured.
3. The expanding head structure is developed from the lower part in the anchor rod, and the required expanding operation space is small.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of a bolt structure before the enlarged head structure of the present invention is developed.
Fig. 2 is a schematic view of the anchor structure after the enlarged head structure of the present invention is deployed.
Fig. 3 is a schematic view of the anchor rod structure after the flaring rod reaches the top of the groove body.
Fig. 4 is a schematic view of the anchor rod of the present invention after it has been anchored.
Fig. 5 is a schematic structural view of the outer tube of the present invention.
Reference numbers and corresponding part names in the drawings:
1-outer tube, 100-step, 2-central column, 3-side column, 4-positioning plate, 5-baffle, 6-bottom plate, 7-flaring rod, 70-second through hole, 8-connecting piece, 9-groove body, 10-second groove, 11-column sleeve, 12-reinforcing rib, 13-anchor hole and 14-first groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1-5, the reinforced anti-floating anchor rod construction structure comprises an outer tube 1 and a core column arranged in the outer tube 1, wherein the core column comprises a center column 2 and a plurality of side columns 3, a positioning plate 4 is arranged in an inner cavity of the outer tube 1, a through hole is arranged on the positioning plate 4, the core column passes through the positioning plate 4 to prevent the core column from shaking in the horizontal direction, the side columns 3 are fixedly connected with the positioning plate 4, the positioning plate 4 can move up and down relative to the center column 2, a baffle 5 and a bottom plate 6 are arranged below the center column 2, the bottom plate 6 is arranged at the bottom end of the center column 2, the baffle 5 is arranged above the bottom plate 6, the lower ends of the side columns 3 are hinged with expanding rods 7, the expanding rods 7 are connected through connecting pieces 8, and the lower ends of the expanding rods 7 are in contact with the edges of the baffle 5, the lower end of the outer pipe 1 is provided with a groove body 9, and the flaring rod 7 can be unfolded from the groove body 9.
The connecting end of the head expanding rod 7 is provided with a hook, the lower end of the side column 3 is welded with a connecting hole, and the hook hooks the connecting hole and bends the end part of the hook to realize the hinging of the head expanding rod 7 and the side column 3.
The head expanding rod 7 is provided with a second through hole 70, and the connecting piece 8 sequentially penetrates through the second through hole 70 to limit the head expanding rod 7 and prevent the head expanding rod from sliding downwards.
The bottom of the outer tube 1 is connected with a bottom plate 6.
The edge of the baffle 5 is provided with a second groove 10, and the head expanding rod 7 is correspondingly limited in the second groove 10.
Therefore, in the process that the side column 3 moves downwards, the flaring rod 7 can extend towards the outside of the outer pipe 1 along the second groove 10 to open the flaring structure, the downward movement can be effectively prevented from generating deviation, and the connecting piece 8 is propped open and broken in the unfolding process of the flaring rod 7.
The outer column sleeve 11 that is provided with of center post 2, column sleeve 11 and center post 2 threaded connection, the bottom of column sleeve 11 is provided with baffle 5, rotates center post 2, column sleeve 11 can follow center post 2 and reciprocate.
After the flaring rod 7 is unfolded, the column sleeve 11 is rotated to enable the column sleeve 11 to move upwards so as to drive the baffle 5 to move upwards until the baffle 5 abuts against the upper edge of the groove body 9.
The lower end of the outer tube 1 is provided with a step 100, and the diameter of the baffle 5 is larger than the inner diameter of the outer tube 1 and smaller than the outer diameter of the outer tube 1.
The size of the baffle 5 is set so that the baffle 5 can be limited at the step 100 and cannot rise continuously in the process of moving upwards along with the column sleeve 11.
Example 2
The present embodiment is different from embodiment 1 in that the expanding rod 7 is sleeved with a water-stop rubber (not shown).
The water-stopping rubber is adhered to the flaring rod 7.
Example 3
The difference between this embodiment and embodiment 2 is that the water-stopping rubber is set as a sleeve body, which is sleeved on the head-expanding rod 7, and the surface contacting with the second groove 10 is not set with water-stopping rubber, so as to reduce friction and facilitate better stretching.
The anchoring reinforcing part of the anchor rod structure is just in an expanding structure, when the underground environment is a water-rich environment, if the anchor rod and the inner core column are in a humid environment for a long time, the anchor rod and the inner core column can be corroded, and the anti-pulling performance of the anchor rod is weakened due to the long-term corrosion, the invention has the advantages that the water-stopping rubber is sleeved on the flaring rod 7, and the baffle 5 is driven by the adjusting column sleeve 11 to push the flaring rod 7 upwards against the upper end of the groove body 9, so that the baffle 5 can be limited at the groove body 9, so that the baffle 5 and the flaring rod 7 seal the bottom of the outer tube 1 and, when in a water-rich environment, the water-stopping rubber can expand to seal the gap between the flaring rod 7 and the groove body 9, effectively prevent water from entering the inner cavity of the outer pipe 1, thereby guaranteed that the interior stem of stock is not corroded by humid environment, guaranteed the long-term steadiness of stock.
Example 4
The construction process of the reinforced anti-floating anchor rod construction structure comprises the following steps:
step 1: firstly, a T-shaped anchor hole 13 is drilled, and a first groove 14 capable of accommodating the bottom plate 6 is arranged in a horizontal cavity of the T-shaped anchor hole 13;
step 2: inserting the anchor rod into the anchor hole 13 and letting the bottom plate 6 rest in said first recess 14;
and step 3: applying pressure to the side pillars 3 by using the sleeve, so that the side pillars 3 move downwards and gradually expand outwards the outer pipe 1 under the supporting action of the baffle 5;
and 4, step 4: after the expanding structure is expanded, the column sleeve 11 is rotated, so that the column sleeve 11 drives the baffle 5 to move upwards until the side column 3 is contacted with the top of the groove body 9;
and 5: injecting paddles outside the outer pipe 1;
step 6: embedding a reinforcing rib 12 into the gap of the inner cavity of the outer tube 1, and inserting the reinforcing rib through a through hole of the positioning plate 4 when the reinforcing rib is specifically embedded;
and 7: the anchor rods are connected to the floor 6 of the building.
In the construction process, the anchor hole 13 comprises a T-shaped groove, the large end of the T-shaped groove is used for accommodating an expanded anchor structure, the large end is also provided with a first groove 14, the first groove 14 is used for accommodating the bottom plate 6, before grouting, the bottom plate 6, the groove body 9 and the external anchor hole 13 are communicated according to the previous description, and the baffle 5 and the expanded rod 7 block the inner cavity of the outer pipe 1, so that slurry can enter the bottom of the outer pipe 1 along the groove body 9 and fill the first groove 14 during grouting, the bottom plate 6 is compacted in the first groove 14 to play a role of primary reinforced anchoring, the expanded rod 7 can be submerged along with the gradual rising of the slurry, the expanded rod 7 plays a role of secondary reinforced anchoring, the whole anchor hole 13 is finally filled, and the inner cavity of the outer pipe 1 is embedded with the reinforcing rib 12 to further improve the strength of the anchor rod.
In the invention, the core column, the reinforcing ribs, the baffle plate and the bottom plate are all made of steel.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The reinforced anti-floating anchor rod construction structure is characterized by comprising an outer pipe (1) and a core column arranged in the outer pipe (1), wherein the core column comprises a center column (2) and a plurality of side columns (3), a positioning plate (4) is arranged in an inner cavity of the outer pipe (1), a through hole is formed in the positioning plate (4), the core column penetrates through the positioning plate (4) to prevent the core column from shaking, a baffle plate (5) and a bottom plate (6) are arranged below the center column (2), the bottom plate (6) is positioned at the bottom end of the center column (2), the baffle plate (5) is positioned above the bottom plate (6), the lower end of the side column (3) is hinged with a head expanding rod (7), the head expanding rods (7) are connected through a connecting piece (8), the lower end of the head expanding rod (7) is in contact with the edge of the baffle plate (5), a groove body (9) is arranged at the lower end of the outer pipe (1), the flaring rod (7) can be unfolded from the groove body (9).
2. The construction structure of the reinforced anti-floating anchor rod according to claim 1, wherein the edge of the baffle (5) is provided with a second groove (10), and the flaring rod (7) is correspondingly limited in the second groove (10).
3. The reinforced anti-floating anchor rod construction structure as claimed in claim 1 or 2, wherein a column sleeve (11) is arranged outside the central column (2), the column sleeve (11) is in threaded connection with the central column (2), the baffle plate (5) is arranged at the bottom of the column sleeve (11), the central column (2) is rotated, and the column sleeve (11) can move up and down along the central column (2).
4. The construction structure of the reinforced anti-floating anchor according to claim 1 or 2, wherein the lower end of the outer pipe (1) is provided with a step (100), and the baffle (5) has a diameter greater than the inner diameter of the outer pipe (1) and smaller than the outer diameter of the outer pipe (1).
5. The construction structure of the reinforced anti-floating anchor rod according to claim 1, wherein a water stop rubber is provided on the enlarged head rod (7).
6. The construction process of the reinforced anti-floating anchor rod construction structure, which is characterized in that the construction of the reinforced anti-floating anchor rod construction structure according to any one of claims 1 to 5, comprises the following steps:
step 1: firstly drilling a T-shaped anchor hole (13) and arranging a first groove (14) capable of accommodating the bottom plate (6) in a horizontal cavity of the T-shaped anchor hole (13);
step 2: -inserting the anchor rod into the anchor hole (13) and letting the bottom plate (6) rest in said first recess (14);
and step 3: applying pressure to the side columns (3) by using the sleeve, so that the side columns (3) move downwards and are gradually expanded outwards of the outer pipe (1) under the supporting action of the baffle (5);
and 4, step 4: after the expanding structure is expanded, rotating the column sleeve (11) to enable the column sleeve (11) to drive the baffle (5) to move upwards until the side column (3) is contacted with the top of the groove body (9);
and 5: injecting paddles outside the outer pipe (1);
step 6: embedding a reinforcing rib (12) into the gap of the inner cavity of the outer pipe (1);
and 7: the anchor rods are connected to the floor (6) of the building.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655893.9A CN111676968A (en) | 2020-07-09 | 2020-07-09 | Reinforced anti-floating anchor rod construction structure and construction process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010655893.9A CN111676968A (en) | 2020-07-09 | 2020-07-09 | Reinforced anti-floating anchor rod construction structure and construction process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111676968A true CN111676968A (en) | 2020-09-18 |
Family
ID=72457556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010655893.9A Pending CN111676968A (en) | 2020-07-09 | 2020-07-09 | Reinforced anti-floating anchor rod construction structure and construction process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111676968A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541457A (en) * | 2022-03-09 | 2022-05-27 | 华能陕西靖边电力有限公司 | Pile foundation for photovoltaic support |
| CN115369870A (en) * | 2022-09-22 | 2022-11-22 | 中国五冶集团有限公司 | Post-cast anti-floating anchor rod |
-
2020
- 2020-07-09 CN CN202010655893.9A patent/CN111676968A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541457A (en) * | 2022-03-09 | 2022-05-27 | 华能陕西靖边电力有限公司 | Pile foundation for photovoltaic support |
| CN115369870A (en) * | 2022-09-22 | 2022-11-22 | 中国五冶集团有限公司 | Post-cast anti-floating anchor rod |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111676968A (en) | Reinforced anti-floating anchor rod construction structure and construction process | |
| CN107605052B (en) | Prefabricated assembled square steel pipe concrete column component connecting structure and construction method thereof | |
| CN112523200B (en) | Integrated tubular pile | |
| CN212983919U (en) | Composite pile foundation | |
| KR100941669B1 (en) | Re-injection device and construction method by pressure for underground anchor-pile | |
| CN212248234U (en) | Reinforced anti-floating anchor rod construction structure | |
| CN109469055B (en) | Local pipe seam type end expansion energy-absorbing anchor rod and construction method thereof | |
| CN111173033A (en) | Prefabricated pipe gallery structure and pipe jacking method construction method thereof | |
| CN201713807U (en) | Steel node of prefabricated concrete pipe pile capable of translating and expanding outwards | |
| CN110886291B (en) | Pile structure in coral sand environment and construction method | |
| CN208441091U (en) | Three wings spiral top expanding Recyclable anchor rope | |
| CN112323790B (en) | A crowded expanding flange pile extension structure for prestressed pipe pile | |
| CN206693228U (en) | A kind of anchor pole and ground substrate plate anti-floating system | |
| CN216948253U (en) | Gravity self-locking anchor head structure | |
| CN110453690A (en) | A kind of recyclable Anchored Sheet Pile Wall for Excavation structure and construction method | |
| CN220133999U (en) | Umbrella type enlarged footing anticreep expansion anchor rod | |
| CN213417813U (en) | Enhanced umbrella-shaped anchor head | |
| CN219218972U (en) | Novel miniature steel pipe concrete pile structure | |
| CN220202649U (en) | Pile is expanded to club-footed concrete strength | |
| CN209195458U (en) | A kind of building anchor pole being conveniently replaceable head | |
| CN113882372B (en) | Anchor rod tensioning method after anchor sealing | |
| CN220451922U (en) | Anchoring device for supporting roof of coal mine tunnel | |
| CN220789873U (en) | Existing basement cushion cap and uplift pile recovery connection system | |
| CN219691565U (en) | Surrounding rock reinforcing structure for demolishing tunnel concrete | |
| CN219908910U (en) | Recoverable pressure expansion type body expansion anchor rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |