CN113481983A - Low-prestress anchor rod - Google Patents

Low-prestress anchor rod Download PDF

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Publication number
CN113481983A
CN113481983A CN202110730893.5A CN202110730893A CN113481983A CN 113481983 A CN113481983 A CN 113481983A CN 202110730893 A CN202110730893 A CN 202110730893A CN 113481983 A CN113481983 A CN 113481983A
Authority
CN
China
Prior art keywords
rod
nut
reinforcing
connecting disc
screw 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
Application number
CN202110730893.5A
Other languages
Chinese (zh)
Inventor
杨德
冯钿
徐新
李金会
刘荣斌
常明华
谢建立
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Construction Second Engineering Bureau Civil Engineering Group Co Ltd
Original Assignee
China Construction Second Engineering Bureau Civil Engineering Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Construction Second Engineering Bureau Civil Engineering Group Co Ltd filed Critical China Construction Second Engineering Bureau Civil Engineering Group Co Ltd
Priority to CN202110730893.5A priority Critical patent/CN113481983A/en
Publication of CN113481983A publication Critical patent/CN113481983A/en
Pending legal-status Critical Current

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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
    • 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
    • E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
    • 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
    • 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
    • E21D21/008—Anchoring or tensioning means
    • 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
    • E21D21/0093—Accessories
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0046—Production methods using prestressing techniques
    • 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 low-prestress anchor rod which comprises a rod body, wherein a first nut is sleeved on the left side of the rod body through threads, a first connecting disc is fixedly connected to the right end of the first nut, a separation blade is connected to the outer portion of the right side of the first connecting disc through a connecting shaft, an elastic rubber layer is fixedly connected between the separation blades, lug plates are fixedly connected to the outer sides of the right sides of the separation blades, a pull rod is connected between the lug plates through a rotating shaft, the right end of the pull rod is connected to the outer side of a second connecting disc through a rotating shaft, and a second nut is inserted in the middle of the second connecting disc through a bearing. Through the overall structure of equipment, cup joint through the outside and rotate the instrument and cup joint in the outside of the body of rod for rotate the instrument and cup joint in the outside of second nut, make the second nut rotate, the second connection pad also can displace left thereupon like this, thereby promote the pull rod and displace left, can strut each separation blade, thereby can satisfy the blockking of not unidimensional entrance to a cave.

Description

Low-prestress anchor rod
Technical Field
The invention relates to the technical field of machinery, in particular to a low-prestress anchor rod.
Background
The low prestressed anchor rod is a stressed rod body which is formed by reinforcing steel bars arranged in a drill hole and the end parts of which extend into a stable rock-soil body and grouting bodies in the hole, and applies a certain pretension force to the anchor rod. The elastic force of the anchor rod is utilized to compress the rock-soil body which can slide so as to increase the shear strength of the sliding surface and achieve the purpose of improving the stability of the rock-soil body. The river-hidden line is located in a high-intensity earthquake area, the rock mass is loose and broken, the prestressed anchor rod is adopted, the combined action of the rock-soil mass and the anchor rod can be better guaranteed by matching with the damping efficiency anchor head, the integral rigidity of the rock-soil mass is improved, the damping efficiency performance of the frame beam is improved, and therefore the slope is guaranteed to be in a good state for a long time.
When the common low-prestress anchor rod is used, the blocking piece at the lower part cannot be adjusted according to the external environment, the middle part of the common rod body is hollow, and the overall structural strength is weak, so that the low-prestress anchor rod is provided.
Disclosure of Invention
The invention aims to provide a low-prestress anchor rod which can meet the blocking requirements of openings with different sizes.
The invention discloses a low prestressed anchor rod, which adopts the technical scheme that: the utility model provides a low prestressed anchorage pole, includes the body of rod, first nut has been cup jointed through the screw thread in the left side of the body of rod, the first flange of right-hand member fixedly connected with of first nut, the right side outside of first flange is connected with the separation blade through the connecting axle, fixedly connected with elastic rubber layer between the separation blade, the right side outside fixedly connected with otic placode of separation blade, be connected with the pull rod through the pivot between the otic placode, the right-hand member of pull rod passes through the pivot and connects the outside at the second flange, the middle part of second flange has been pegged graft through the bearing and has been had the second nut, open the inside and front side left side in the right side of the body of rod has the exhaust hole, the right side of the body of rod has been cup jointed the third nut through the screw thread, the outside of third nut is fixed to be pegged graft and has the inlet pipe.
Preferably, the elastic rubber layer comprises two rubber base layers, two reinforcing mesh layers and two connecting shafts, the reinforcing mesh layers are fixedly embedded on the upper side and the lower side of the inner side of each rubber base layer, the opposite sides of the rubber base layers are movably sleeved on the connecting shafts through connecting rotating shafts, and the inner sides of the connecting shafts and the inner sides of the rubber base layers are connected to the outer sides of the first connecting discs through the connecting shafts.
As preferred scheme, the body of rod is including the reinforcement screw rod, cup joint screw rod, first beaded finish, first grafting annular, second beaded finish and second grafting annular, the upper end fixedly connected with reinforcement screw rod of the body of rod, the outside of reinforcement screw rod has cup jointed the screw rod through the screw thread, the inner chamber right side and the downside of cup jointing the screw rod are opened there is the exhaust hole, first grafting annular has all been opened to the outside lower part of connecting axle and the outside lower part of the body of rod, the inboard of first grafting annular is all pegged graft and is had the second beaded finish, the first beaded finish of downside fixedly connected with on the inboard of second beaded finish, the corresponding grafting of first beaded finish is inside the second grafting annular of downside on the inboard of first grafting annular.
As a preferred scheme, the number of the baffle plates is six, and the baffle plates are connected to the right side of the first connecting disc in an annular array mode.
Preferably, the number of the elastic rubber layers is equal to that of the blocking pieces, and the elastic rubber layers are located between the blocking pieces.
Preferably, the number of the pull rods is equal to that of the baffle plates.
Preferably, the inside of the right side of the rod body is a hollow cavity.
Preferably, the middle parts of the first connecting disc and the second connecting disc are both provided with round holes.
Preferably, the front end of the second reinforcing ring is provided with a notch, the second reinforcing ring is sleeved on the inner side of the first inserting ring groove, and the upper side and the lower side of the second reinforcing ring are respectively welded on the sleeving screw rod and the rod body.
Preferably, the outer side of the sleeving screw rod is provided with threads.
The low-prestress anchor rod disclosed by the invention has the beneficial effects that:
through the overall structure of equipment, cup joint through the outside and rotate the instrument and cup joint in the outside of the body of rod for rotate the instrument and cup joint in the outside of second nut, make the second nut rotate, the second connection pad also can displace left thereupon like this, thereby promote the pull rod and displace left, can strut each separation blade, thereby can satisfy the blockking of not unidimensional entrance to a cave.
Through the structure that is equipped with elastic rubber layer, rubber base cup joints on the connecting axle through a plurality of lantern rings, when elastic rubber layer packed up folding like this, can make rubber base fold more convenient, and can not damage because rubber base is folding for a long time.
Through being equipped with the reinforcing screw rod, cup jointing the structure of the first beaded finish of screw rod, first grafting annular, second beaded finish and second grafting annular, the bulk strength of the increase body of rod that can be great to the connection structure of first beaded finish, first grafting annular, second beaded finish, second grafting annular, great increase the reinforcing screw rod, cup jointed the joint strength of screw rod.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is an expanded view of the baffle of the present invention;
FIG. 3 is a cross-sectional view of the elastomeric rubber layer of the present invention;
FIG. 4 is a top view of the elastomeric rubber layer of the present invention;
FIG. 5 is a cross-sectional view of the rod of the present invention.
In the figure: the device comprises a rod body 1, a first nut 2, a first connecting disc 3, a blocking sheet 4, a pull rod 5, a second connecting disc 6, an exhaust hole 7, a third nut 8, a feeding pipe 9, an ear plate 10, an elastic rubber layer 11, a rubber base layer 111, a reinforcing mesh layer 112, a connecting shaft 113, a reinforcing screw rod 12, a sleeved screw rod 13, a first reinforcing ring 14, a first inserting ring groove 15, a second reinforcing ring 16, a second inserting ring groove 17 and a second nut 18.
Detailed Description
The invention will be further elucidated and described with reference to the embodiments and drawings of the specification:
referring to fig. 1-5, the present invention: a low-prestress anchor rod comprises a rod body 1, wherein a first nut 2 is sleeved on the left side of the rod body 1 through threads, a first connecting disc 3 is fixedly connected to the right end of the first nut 2, a blocking piece 4 is connected to the outer portion of the right side of the first connecting disc 3 through a connecting shaft, the blocking piece 4 can rotate through the connecting shaft, an elastic rubber layer 11 is fixedly connected between the blocking pieces 4, the elastic rubber layer 11 can be folded, when the blocking piece 4 is opened and closed, the blocking piece can be opened and folded, an ear plate 10 is fixedly connected to the outer side of the right side of the blocking piece 4, the ear plate 10 is used for connecting a pull rod 5, a pull rod 5 is connected between the ear plates 10 through a rotating shaft, the pull rod 5 can move along with the left and right movement of a second connecting disc 6, the right end of the pull rod 5 is connected to the outer side of the second connecting disc 6 through a rotating shaft, the second nut 18 is inserted in the middle of the second connecting disc 6 through a bearing, exhaust hole 7 can be when pouring cement, the inside air of discharge space, the right side of the body of rod 1 has cup jointed third nut 8 through the screw thread, and third nut 8 can carry out outside locking fastening, the fixed grafting in outside of third nut 8 has inlet pipe 9.
Equipment is when using, peg graft the body of rod 1 inside the location hole of opening, at first twist out third nut 8, then when needing to expand separation blade 4, cup joint through the outside and rotate the instrument and cup joint in the outside of the body of rod 1, make and rotate the outside that the instrument cup jointed at second nut 18, make second nut 18 rotate, thereby make second nut 18 displacement left, because the effect of bearing, can make second connection pad 6 can not rotate along with second nut 18, second connection pad 6 also can displace left thereupon like this, thereby promote the displacement left of pull rod 5, can prop open each separation blade 4, thereby can satisfy the blockking of not unidimensional entrance to a cave.
As shown in fig. 2, 3 and 4:
the elastic rubber layer 11 comprises two rubber base layers 111, two reinforcing mesh layers 112 and two connecting shafts 113, the reinforcing mesh layers 112 are fixedly inlaid on the upper and lower sides of the inner side of each rubber base layer 111, the opposite sides of the rubber base layers 111 are movably sleeved on the connecting shafts 113 through connecting rotating shafts, and the inner sides of the connecting shafts 113 and the rubber base layers 111 are connected to the outer side of the first connecting disc 3 through the connecting shafts.
Rubber base 111 cup joints on connecting axle 113 through a plurality of lantern rings, when elasticity rubber layer 11 was packed up foldingly like this, can make rubber base 111 fold more convenient, and can not fold for a long time and damage because of rubber base 111, has increased the anti folding ability of elasticity rubber layer 11.
The rubber base layer 111 can be folded so that it can be folded when the flap 4 is stored and opened, and the reinforcing mesh layer 112 can increase the overall strength of the elastic rubber layer 11.
As illustrated in fig. 5:
the body of rod 1 is including enhancement screw 12, cup joint screw 13, first beaded finish 14, first grafting annular 15, second beaded finish 16 and second grafting annular 17, the upper end fixedly connected with enhancement screw 12 of the body of rod 1, the outside of enhancement screw 12 has cup jointed screw 13 through the screw thread, the inner chamber right side and the downside of cup jointing screw 13 are opened and are had exhaust hole 7, first grafting annular 15 has all been opened to the outside lower part of connecting axle 113 and the outside lower part of the body of rod 1, the inboard of first grafting annular 15 has all been pegged graft and has been had second beaded finish 16, the first beaded finish 14 of downside fixedly connected with on the inboard of second beaded finish 16, the corresponding grafting of first beaded finish 14 is inside on the first grafting annular 15 inboard second grafting annular 17 of downside.
Cup joint in the outside of strengthening screw 12 through cup jointing screw 13, the intensity on the increase body of rod 1 upper portion that can be great to can not influence the exhaust of exhaust hole 7, peg graft in the inside of second grafting annular 17 through second beaded finish 16 simultaneously, and second beaded finish 16 is the welded, consequently the increase that can be great cup joints screw 13 and strengthening screw 12's joint strength.
The separation blade 4 is equipped with six, separation blade 4 is the right side at first flange 3 is connected in annular array.
The number of the elastic rubber layers 11 is equal to that of the baffle plates 4, and the elastic rubber layers 11 are positioned between the baffle plates 4.
As shown in fig. 1:
the inside cavity that is of the right side of the body of rod 1, the quantity of pull rod 5 equals the quantity of separation blade 4, the round hole has all been opened at the middle part of first connection pad 3 and second connection pad 6.
As shown in fig. 5:
the front end of the second reinforcing ring 16 is provided with a notch, the second reinforcing ring 16 is sleeved in the first inserting ring groove 15, and the upper side and the lower side of the second reinforcing ring are respectively welded on the sleeved screw rod 13 and the rod body 1.
The outer side of the sleeving screw rod 13 is provided with threads, and the threads can facilitate sleeving of external nuts.
In this application, equipment is when the installation, body of rod 1 is pegged graft inside the positioning hole of having opened, at first, twist out third nut 8, then when needing to expand separation blade 4, cup joint the outside that the rotation instrument cup jointed at the body of rod 1 through outside, make the rotation instrument cup joint the outside at second nut 18, make second nut 18 rotate, thereby make second nut 18 displacement left, because the effect of bearing, can make second connection pad 6 can not rotate along with second nut 18 rotates, second connection pad 6 also can displace left thereupon like this, thereby promote pull rod 5 displacement left, can prop up each separation blade 4, thereby can satisfy the blockking of not unidimensional entrance to a cave, cup joint third nut 8 after the location finishes, then through inlet pipe 9 to the inside pour into the material into can.
Simultaneously cup joint in the outside of strengthening screw 12 through cup jointing screw 13, the intensity on the increase body of rod 1 upper portion that can be great to can not influence the exhaust of exhaust hole 7, peg graft in the inside of second grafting annular 17 through second beaded finish 16 simultaneously, and second beaded finish 16 is the welded, consequently the increase that can be great cup joints screw 13 and strengthening screw 12's joint strength.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A low prestressed anchorage, includes body of rod (1), its characterized in that: the left side of the rod body (1) is sleeved with a first nut (2) through threads, a right end fixedly connected with first connecting disc (3) of the first nut (2), the right side of the first connecting disc (3) is connected with a separation blade (4) through a connecting shaft, an elastic rubber layer (11) is fixedly connected between the separation blades (4), a lug plate (10) is fixedly connected to the outer side of the right side of the separation blade (4), a pull rod (5) is connected between the lug plates (10) through a rotating shaft, the right end of the pull rod (5) is connected to the outer side of a second connecting disc (6) through a rotating shaft, a second nut (18) is inserted into the middle of the second connecting disc (6) through a bearing, a third nut (8) is sleeved on the right side of the rod body (1) through threads, and a feeding pipe (9) is fixed and inserted into the outer side of the third nut (8).
2. The low prestress anchor of claim 1, wherein: the elastic rubber layer (11) comprises two rubber base layers (111), two reinforcing mesh layers (112) and two connecting shafts (113), the reinforcing mesh layers (112) are fixedly inlaid on the upper side and the lower side of the inner side of each rubber base layer (111), the opposite sides of the rubber base layers (111) are movably sleeved on the connecting shafts (113) through connecting rotating shafts, and the inner sides of the connecting shafts (113) and the rubber base layers (111) are connected to the outer side of the first connecting disc (3) through the connecting shafts.
3. The low prestress anchor of claim 1, wherein: the rod body (1) comprises a reinforcing screw rod (12), a sleeving screw rod (13), a first reinforcing ring (14), a first inserting ring groove (15), a second reinforcing ring (16) and a second inserting ring groove (17), the upper end of the rod body (1) is fixedly connected with a reinforcing screw rod (12), the outer side of the reinforcing screw rod (12) is sleeved with a sleeved screw rod (13) through threads, the right side and the lower side of the inner cavity of the sleeving screw rod (13) are provided with exhaust holes (7), the lower part of the outer side of the connecting shaft (113) and the lower part of the outer side of the rod body (1) are both provided with a first inserting ring groove (15), the inner sides of the first inserting ring grooves (15) are inserted with second reinforcing rings (16), the upper side and the lower side of the inner side of the second reinforcing ring (16) are fixedly connected with a first reinforcing ring (14), the first reinforcing ring (14) is correspondingly inserted into the second insertion ring grooves (17) on the upper side and the lower side of the inner side of the first insertion ring groove (15).
4. The low prestress anchor of claim 1, wherein: the separation blade (4) are equipped with six, separation blade (4) are the annular array and connect on right side connecting axle (113) of first flange (3).
5. The low prestress anchor of claim 1, wherein: the number of the elastic rubber layers (11) is equal to that of the baffle plates (4), and the elastic rubber layers (11) are located between the baffle plates (4).
6. The low prestress anchor of claim 1, wherein: the number of the pull rods (5) is equal to that of the baffle plates (4).
7. The low prestress anchor of claim 1, wherein: the right side of the rod body (1) is internally provided with a hollow cavity.
8. The low prestress anchor of claim 1, wherein: round holes are formed in the middle of the first connecting disc (3) and the middle of the second connecting disc (6).
9. The low prestress anchor of claim 1, wherein: the front end of second beaded finish (16) is opened there is the incision, and second beaded finish (16) cup joints behind first grafting annular (15) inboard, and the welding respectively on cup jointing screw rod (13) and body of rod (1) about and.
10. The low prestress anchor of claim 1, wherein: the outer side of the sleeving screw rod (13) is provided with threads.
CN202110730893.5A 2021-06-29 2021-06-29 Low-prestress anchor rod Pending CN113481983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110730893.5A CN113481983A (en) 2021-06-29 2021-06-29 Low-prestress anchor rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110730893.5A CN113481983A (en) 2021-06-29 2021-06-29 Low-prestress anchor rod

Publications (1)

Publication Number Publication Date
CN113481983A true CN113481983A (en) 2021-10-08

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Family Applications (1)

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CN202110730893.5A Pending CN113481983A (en) 2021-06-29 2021-06-29 Low-prestress anchor rod

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1193677A (en) * 1997-03-19 1998-09-23 张继红 Umbrella type anchor
WO2003010391A1 (en) * 2001-07-23 2003-02-06 Karda Jozef Ground anchor with driving and opening device
CN104179178A (en) * 2014-08-28 2014-12-03 南昌工程学院 Flexible umbrella supporting anchor bolt and method for supporting soil slope thereby
CN104278674A (en) * 2014-09-22 2015-01-14 华汇工程设计集团股份有限公司 Recyclable expansion anchor rod and construction method thereof
CN205189915U (en) * 2015-12-08 2016-04-27 山东科技大学 Umbelliform support formula slip casting stock
CN106122219A (en) * 2016-08-23 2016-11-16 无锡市东赫金属制品有限公司 A kind of have the bolt increasing threaded rod size
US20200131729A1 (en) * 2017-07-03 2020-04-30 Anadolu Universitesi Rektorlugu Umbrella anchorage
CN211230517U (en) * 2019-10-30 2020-08-11 湖北省电力勘测设计院有限公司 Enlarged footing stock
CN111794223A (en) * 2020-07-14 2020-10-20 辽宁工程技术大学 Umbrella contraction type anti-falling anchor rod structure and using method
CN112112158A (en) * 2020-10-20 2020-12-22 辽宁科技学院 Support and consolidate stock with abnormal shape hole slip casting
CN215052958U (en) * 2021-05-27 2021-12-07 中建二局土木工程集团有限公司 Low-prestress anchor rod

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1193677A (en) * 1997-03-19 1998-09-23 张继红 Umbrella type anchor
WO2003010391A1 (en) * 2001-07-23 2003-02-06 Karda Jozef Ground anchor with driving and opening device
CN104179178A (en) * 2014-08-28 2014-12-03 南昌工程学院 Flexible umbrella supporting anchor bolt and method for supporting soil slope thereby
CN104278674A (en) * 2014-09-22 2015-01-14 华汇工程设计集团股份有限公司 Recyclable expansion anchor rod and construction method thereof
CN205189915U (en) * 2015-12-08 2016-04-27 山东科技大学 Umbelliform support formula slip casting stock
CN106122219A (en) * 2016-08-23 2016-11-16 无锡市东赫金属制品有限公司 A kind of have the bolt increasing threaded rod size
US20200131729A1 (en) * 2017-07-03 2020-04-30 Anadolu Universitesi Rektorlugu Umbrella anchorage
CN211230517U (en) * 2019-10-30 2020-08-11 湖北省电力勘测设计院有限公司 Enlarged footing stock
CN111794223A (en) * 2020-07-14 2020-10-20 辽宁工程技术大学 Umbrella contraction type anti-falling anchor rod structure and using method
CN112112158A (en) * 2020-10-20 2020-12-22 辽宁科技学院 Support and consolidate stock with abnormal shape hole slip casting
CN215052958U (en) * 2021-05-27 2021-12-07 中建二局土木工程集团有限公司 Low-prestress anchor rod

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Application publication date: 20211008