CN210421087U - Quick-mounting and quick-dismounting type recoverable anchorage device - Google Patents
Quick-mounting and quick-dismounting type recoverable anchorage device Download PDFInfo
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- CN210421087U CN210421087U CN201921275072.1U CN201921275072U CN210421087U CN 210421087 U CN210421087 U CN 210421087U CN 201921275072 U CN201921275072 U CN 201921275072U CN 210421087 U CN210421087 U CN 210421087U
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Abstract
The utility model belongs to the technical field of civil engineering machinery, a recoverable ground tackle of fast-assembling quick-release formula and dismantlement method thereof is disclosed. The anchor comprises a guide rail protective cap, a conical clamping piece, a conical clamp, a bearing disc, a protective outer skin and a steel strand; the opening end of the guide rail protective cap is connected with one end of the conical clamp, and the bearing disc is sleeved on the outer wall of the conical clamp; the end of the steel strand penetrates through the protective sheath and is inserted into the through hole of the conical clamp, and one end of the conical clamping piece is wedged into a space between the steel strand and the conical clamp; the guide rail protection device is characterized by further comprising a quick assembling and disassembling mechanism arranged in the inner cavity of the guide rail protection cap, one end of the quick assembling and disassembling mechanism is connected with the other end of the conical clamping piece in a rotating mode, and the other end of the quick assembling and disassembling mechanism is connected with the closed end of the guide rail protection cap through a spring. The reliability and stability of the anchorage device in the aspects of assembly, installation, use and disassembly are greatly improved.
Description
Technical Field
The utility model belongs to the technical field of civil engineering machinery, concretely relates to recoverable ground tackle of fast-assembling quick-release formula.
Background
Prestressed anchorage cables and ground anchors are widely used in the fields of geotechnical engineering, constructional engineering, roads, bridges, ports, wharfs and the like. Under the current general conditions, when the prestressed anchor cables and the ground anchors lose functions and are not used any more, the prestressed anchor cables and the ground anchors are permanently stored in a use environment and cannot be removed, and when the use environment needs to construct other buildings, such as shield construction during subway construction, pipe-jacking construction of underground pipelines, support pile construction of buildings and the like, the prestressed anchor cables or the ground anchors become barriers, so that the work of breaking the prestressed anchor cables or the ground anchors is added in the construction process of a new building, the construction cost is increased, and sometimes even the construction of the new building becomes impossible. Therefore, some areas have been regulated to use prestressed anchor cables or anchors not to exceed the red line, which results in the stranded situation when the prestressed anchor cables or anchors are necessary, and the cost is increased to replace other agents. In order to avoid the situation, the detachable prestressed anchor cable and the internal anchor of the ground anchor appear, the detachable prestressed anchor solves the problem of recovering prestressed steel strands, has obvious practical benefits and significance for saving materials and avoiding underground environmental pollution, and is the direction of anchor development.
The patent application No. 02801815.X published by the State intellectual Property office of China "wedge assembly and internal anchorage device using the wedge assembly" proposes an anchorage device, which is an internal anchorage device composed of a wedge cylinder, a wedge with a wedge locking ring whose inner surface is spirally engaged with the front end part of the outer surface of teeth and used for keeping the wedge assembly state, and a locking groove, a wedge opening ring, a traction claw, a traction plate and other components arranged inside and outside the wedge for removing steel strands, and the basic types of the internal anchorage device are 5 basic types of locking ring internal anchorage devices, square thread internal anchorage devices, hook internal anchorage devices, locking ring-stable ring internal anchorage devices and square thread-stable ring internal anchorage devices.
The above 5 basic forms of internal anchorages all suffer from varying degrees of disadvantages in use:
in one or all of the above-described internal anchors, the wedges are constrained to the circumference of the tension member only by one C-shaped wedge ring or rubber elastic ring, and when the tension member is tensioned, it is likely that the inclined surface of the inner surface of the wedge cylinder gives a bearing component force to the wedges in the axial direction and opposite to the tension direction, which is greater than the friction force generated by the wedges and the tension member constrained by the C-shaped wedge rings or rubber elastic rings (the side of the wedges having the engaging teeth, due to the wedge-opening ring, cancels a part of the constraint force of the C-shaped wedge rings or rubber elastic rings, so that the friction force generated by the wedges and the tension member is smaller), and thus the tension member is withdrawn from the middle of the wedges in a sliding manner and cannot be used. The locking ring-stable annular internal anchorage and the square thread-stable annular internal anchorage are provided with a cap inclined surface and a stabilizing ring, the cap inclined surface presses the stabilizing ring, so that the frictional resistance between a wedge and the stabilizing ring and between the wedge and a wedge locking ring is increased when the wedge axially moves towards the tensioning direction (the frictional resistance and the supporting component force resultant force of the wedge which is axially opposite to the tensioning direction are exerted by the inclined surface on the inner surface of the wedge cylinder are combined with the frictional resistance which is a rubber elastic ring and is not pressed slightly better in the case of the wedge), the tensile member needs to provide larger frictional tension force than that between the tensile members of the previous internal anchorages and the wedge during tensioning, the wedge can be pulled to move to lock the tensile member, and the wedge is restrained only by one C-shaped locking ring or rubber elastic ring, the latter two internal anchors are more prone to the pulling out of the tension member from the middle of the wedge as a result of friction with the tension member than the first three anchors.
In the zero working state of the two anchorage devices, namely the locking ring-shaped internal anchorage device and the hook-shaped internal anchorage device, in the processes of installation, carrying, construction and the like, if the tension member is touched, oscillated and impacted by accident and is displaced in the direction opposite to the tension direction, misoperation is easy to occur, each disengaging device of the anchorage device is enabled to act, and therefore the tension member is in a loosening state, and the internal anchorage device fails. In the zero working state of the square thread-shaped internal anchorage device in the processes of installation, transportation, construction and the like, if the tensile member is touched, oscillated and impacted by accident and the tensile member rotates towards the direction of the thread occlusion of the traction plate and the nut cap, the traction plate and the nut cap are occluded, and misoperation is easy to occur, so that a separation device of the anchorage device acts, the tensile member is in a loose state, and the internal anchorage device fails. Moreover, the anchorage device cannot resist the impact action of variable load. This is a drawback when the exterior of the tensile member is subjected to repeated application of varying loads from zero, requiring separation, installation and re-separation, and re-installation of multiple times.
When two kinds of anchorage devices, namely a square thread-shaped internal anchorage device and a square thread-stable annular internal anchorage device, are used for removing steel strands of anchor cables and ground anchors, a rotary stretching component is required to drive a wedge traction plate to rotate, so that the wedge traction plate threads are meshed with threads on a cap to remove the stretching component, if the rotary stretching component is rotated, the rotary friction force between the stretching component and a wedge is smaller than the rotary friction resistance force between the wedge traction plate threads and the threads on the cap, slipping can occur between the stretching component and the wedge, and if the wedge moves along with the stretching component when the stretching component is pulled forcibly, the stretching component can be clamped by the wedge again and cannot be removed.
In addition, the anchorage devices have more machined parts, higher requirements on machining precision such as gaps and the like, troublesome assembly and higher cost.
SUMMERY OF THE UTILITY MODEL
In order to solve one or more technical problems of the above-mentioned that prior art exists, the utility model provides a recoverable ground tackle of fast-assembling quick-release formula can guarantee when bumping, rotatory in ground tackle transport, the work progress, can not make steel strand wires and recovery mechanism pine take off to the reliability and the stability of ground tackle in the aspect of the aggregate erection use, demolish have been improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a quick-assembly and quick-disassembly type recoverable anchor comprises a guide rail protective cap, a conical clamping piece, a conical clamp, a bearing disc, a protective sheath and a steel strand; the opening end of the guide rail protective cap is connected with one end of the conical clamp, and the bearing disc is sleeved on the outer wall of the conical clamp; the end head of the steel strand penetrates through the protective outer skin and is inserted into the through hole of the conical clamp, and one end of the conical clamping piece is wedged into a space between the steel strand and the conical clamp; still including set up in quick assembly disassembly mechanism in the guide rail protective cap inner chamber, quick assembly disassembly mechanism's one end with the toper clamping piece other end is connected rotatoryly, quick assembly disassembly mechanism's the other end pass through the spring with the blind end of guide rail protective cap is connected.
Further, the quick assembly and disassembly mechanism comprises a first assembly and disassembly member, a second assembly and disassembly member and a third assembly and disassembly member; one end of the first assembly and disassembly member is connected with the closed end of the guide rail protective cap through the spring, the other end of the first assembly and disassembly member is connected with one end of the second assembly and disassembly member in a clamping manner, the other end of the second assembly and disassembly member is connected with one end of the third assembly and disassembly member through a fixing screw, and the other end of the third assembly and disassembly member is rotationally connected with the conical clamping piece; and a limiting mechanism for limiting the quick assembling and disassembling mechanism to move along the axis direction of the guide rail protective cap is arranged on the inner wall of the guide rail protective cap.
Furthermore, the limiting mechanisms are a plurality of limiting guide rails which are arranged on the inner wall of the guide rail protective cap at intervals along the axis direction of the guide rail protective cap, and limiting grooves are formed in the outer wall of the second assembly and disassembly component at positions corresponding to the limiting guide rails.
Further, a metal film or a non-metal film is arranged between the inner surface of the conical clamp and the outer surface of the conical clamping piece.
Furthermore, the conical clamp is provided with a tooth meshing opening used for meshing the steel strand on the inner surface in contact with the steel strand.
Further, the bearing disc is connected with the conical clamp through threads.
Compared with the prior art, the utility model provides a technical scheme has following beneficial effect or advantage:
the utility model provides a but quick-assembling quick-release formula recovery ground tackle reliability and stability in the aspect of the composite mounting uses, demolishs improve greatly, especially ground tackle equipment back, when bumping, rotatory in transport, the work progress under zero operating condition, be difficult to make ground tackle pine take off, take place the malfunction and become invalid.
The utility model provides a recoverable ground tackle of fast-assembling quick-release formula simple structure, part are few, and the processing cost is low, and economy is suitable for and promotes on a large scale.
The utility model provides a recoverable ground tackle of fast-assembling quick-release formula is dismantled simply, need not with the help of any equipment, convenient and fast.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a cross-sectional view of a quick-install and quick-release type retractable anchor according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;
FIG. 5 is a cross-sectional view taken along line D-D of FIG. 1;
fig. 6 is a cross-sectional view E-E of fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the position or the positional relationship is based on the position or the positional relationship shown in the drawings, or the position or the positional relationship that the utility model is usually placed when using, or the position or the positional relationship that the skilled person conventionally understands, or the position or the positional relationship that the utility model is usually placed when using, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or suggest that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the drawings of the above terms in the embodiments with specific meanings in the present invention can be understood in specific situations, and the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1-6, an embodiment of the present invention provides a quick-assembly quick-disassembly type recoverable anchor, which is characterized in that the anchor comprises a guide rail protective cap 1, a tapered clamping piece 7, a tapered clamp 8, a bearing disc 9, a protective sheath 10 and a steel strand 11; the opening end of the guide rail protective cap 1 is connected with one end of the conical clamp 8, and the bearing disc 9 is sleeved on the outer wall of the conical clamp 8; the end of the steel strand 11 penetrates through the protective outer skin 10 and is inserted into the through hole of the conical clamp 8, and one end of the conical clamping piece 7 is wedged into a space between the steel strand 11 and the conical clamp 8; still including setting up the quick assembly disassembly mechanism in guide rail protective cap 1 inner chamber, the one end and the toper clamping piece 7 other end of quick assembly disassembly mechanism are connected, the other end of quick assembly disassembly mechanism passes through spring 2 and is connected with the blind end of guide rail protective cap 1.
Wherein the quick-release mechanism comprises a first assembly and disassembly member 3, a second assembly and disassembly member 4 and a third assembly and disassembly member 6; one end of a first assembly and disassembly component 3 is connected with the closed end of the guide rail protection cap 1 through a spring 2, the other end of the first assembly and disassembly component 3 is connected with one end of a second assembly and disassembly component 4 in a clamping way, the other end of the second assembly and disassembly component 4 is connected with one end of a third assembly and disassembly component 6 through a fixing screw 5, and the other end of the third assembly and disassembly component 6 is connected with a conical clamping piece 7; and a limiting mechanism for limiting the quick assembling and disassembling mechanism to move along the axis direction of the guide rail protective cap 1 is arranged on the inner wall of the guide rail protective cap 1. The limiting mechanisms are specifically a plurality of limiting guide rails 12 which are arranged on the inner wall of the guide rail protective cap 1 at intervals along the axis direction of the guide rail protective cap 1, and limiting grooves 13 are arranged on the outer wall of the second assembling and disassembling member 4 at positions corresponding to the limiting guide rails 12.
The embodiment of the utility model provides a but quick-assembling quick-release formula recovery ground tackle uses in the aggregate erection, demolishs reliability and stability in the aspect of improve greatly, especially ground tackle equipment back, when bumping, rotatory in transport, the work progress under zero operating condition, is difficult to make ground tackle pine take off, take place the malfunction and become invalid.
The embodiment of the utility model provides a recoverable ground tackle of fast-assembling quick-release formula simple structure, part are few, and the processing cost is low, and economy is suitable for, is fit for promoting on a large scale.
The embodiment of the utility model provides a recoverable ground tackle of fast-assembling quick-release formula is dismantled simply, need not with the help of any equipment, convenient and fast.
In the specific implementation process, in order to ensure low friction and non-adhesion between the inner surface of the conical clamp 8 and the outer surface of the conical clamping piece 7, the installation and the disassembly are convenient. In a further embodiment, embodiments of the present invention provide a metallic or non-metallic film between the inner surface of the conical clamp 8 and the outer surface of the conical jaw 7. The specific setting mode is as follows:
the hardness of the contact surface of the two parts is increased by a heat treatment method, such as QPQ heat treatment, and self-lubrication, low friction and non-blocking are achieved.
The roughness of the contact surface of the two parts is obviously reduced by various finishing methods to ensure that the surface roughness is in the range of Ra0.4-Ra0.6, for example, the inner surface of the conical clamp 8 adopts the surface finishing processing to reduce the surface roughness, reduce friction and prevent adhesion.
The contact surfaces of the two parts are coated with a low-friction, self-lubricating, non-stick metallic or non-metallic coating using a variety of surface treatment techniques, such as hard coating or teflon coating on the inner surface of the tapered fixture 8.
A high-performance solid lubricating film with low friction, self-lubrication and anti-adhesion, such as a 7409 solid lubricating film, is laid on the contact surface of the two parts.
A metal or nonmetal or metal and nonmetal composite film gasket, for example, a plastic, paper, fiber, aluminum, iron, copper or alloy film gasket, is provided between the contact surfaces of the two members.
By providing a metallic or non-metallic film between the inner surface of the conical clamp 8 and the outer surface of the conical jaw 7. Can ensure low friction, self-lubrication and non-adhesion between the two.
In order to be able to better fix the steel strand during the specific implementation, in a further embodiment, the conical clamp 8 in the embodiment of the present invention is provided with a tooth for engaging the steel strand 11 at the inner surface in contact with the steel strand 11.
In specific implementation, in order to make the bearing plate 9 and the tapered clamp 8 connected more firmly, in a further embodiment, the embodiment of the present invention provides a bearing plate 9 and a tapered clamp 8 connected with each other through a screw thread.
The utility model discloses the implementation of the above-mentioned fast-assembling quick-release recoverable ground tackle who provides installs and removes the process as follows:
during assembly, the bearing disc 9 is sleeved on the outer wall of the conical clamp 8 through threads;
the second assembly and disassembly member 4 is tightly connected with the third assembly and disassembly member 6 by a fixing screw 5, and then the conical clamping piece 7 is connected with the third assembly and disassembly member 6;
sequentially installing the spring 2, the first assembly and disassembly member 3, the second assembly and disassembly member 4, the third assembly and disassembly member 6 and the tapered clamping piece 7 into the guide rail protective cap 1;
inserting the steel strand 11 into the conical clamp 8 through the protective sheath 10;
wedging the other end of the conical clamping piece 7 into a space between the steel strand 11 and the conical clamp 8, and then connecting the open end of the guide rail protective cap 1 with the conical clamp 8, namely completing assembly.
After the anchorage device is assembled, the anchorage device is in a locking state with a set force value no matter in the carrying and construction processes in a zero working state or under a working condition.
When the anchorage device needs to be disassembled, the steel strand 11 is forcibly pushed into the direction of the spring 2 through outer end manpower, so that the spring 2, the first assembly and disassembly component 3, the second assembly and disassembly component 4, the third assembly and disassembly component 6 and the conical clamping piece 7 can be driven to move along the limiting guide rail 12 in the guide rail protective cap 1 and enter a locking state. At this time, the tapered clip 7 is disengaged from the tapered clip 8. The steel strand 11 is then pulled outwardly, out of the tapered clip 7 and, in turn, out of the tapered clamp 8 and the protective sheath 10.
Wherein the locking state is: the second assembly and disassembly component 4 moves towards the direction of the spring 2 until the second assembly and disassembly component 4 is separated from the limit guide rail 12; the guide rail protection cap 1 is rotated to make the limiting guide rail 12 on the inner wall of the guide rail protection cap 1 dislocate with the limiting groove 13 on the second assembly and disassembly member 4, namely, the guide rail 12 enters a locking state, and at the moment, the spring 2, the first assembly and disassembly member 3, the second assembly and disassembly member 4, the third assembly and disassembly member 6 and the tapered clamping piece 7 cannot move towards the tapered clamp 8 when no force acts on the steel stranded wire 11 or opposite force acts on the steel stranded wire 11 due to the action of the limiting guide rail 12.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A quick-assembly and quick-disassembly type recoverable anchor device is characterized by comprising a guide rail protective cap (1), a conical clamping piece (7), a conical clamp (8), a bearing disc (9), a protective outer skin (10) and a steel strand (11); the opening end of the guide rail protective cap (1) is connected with one end of the conical clamp (8), and the bearing disc (9) is sleeved on the outer wall of the conical clamp (8); the end of the steel strand (11) penetrates through the protective outer skin (10) and is inserted into the through hole of the conical clamp (8), and one end of the conical clamping piece (7) is wedged into a space between the steel strand (11) and the conical clamp (8); still including set up in quick assembly disassembly mechanism in guide rail protective cap (1) inner chamber, quick assembly disassembly mechanism's one end with toper clamping piece (7) other end swivelling joint, quick assembly disassembly mechanism's the other end pass through spring (2) with the blind end of guide rail protective cap (1) is connected.
2. The quick load and unload recoverable anchor of claim 1, wherein the quick assembly and disassembly mechanism comprises a first assembly and disassembly member (3), a second assembly and disassembly member (4), and a third assembly and disassembly member (6); one end of the first assembly and disassembly member (3) is connected with the closed end of the guide rail protective cap (1) through the spring (2), the other end of the first assembly and disassembly member (3) is connected with one end of the second assembly and disassembly member (4) in a clamping manner, the other end of the second assembly and disassembly member (4) is connected with one end of the third assembly and disassembly member (6) through a fixing screw (5), and the other end of the third assembly and disassembly member (6) is rotationally connected with the conical clamping piece (7); the inner wall of the guide rail protective cap (1) is provided with a limiting mechanism for limiting the quick assembling and disassembling mechanism to move along the axis direction of the guide rail protective cap (1).
3. The quick-assembly and quick-disassembly type recoverable anchorage device according to claim 2, wherein the limiting mechanism comprises a plurality of limiting guide rails (12) arranged on the inner wall of the guide rail protection cap (1) at intervals along the axial direction of the guide rail protection cap (1), and a limiting groove (13) is arranged on the outer wall of the second assembly and disassembly member (4) at a position corresponding to each limiting guide rail (12).
4. A quick-install and quick-release recoverable anchor according to any of claims 1 to 3, wherein a metallic or non-metallic film is provided between the inner surface of the conical clamp (8) and the outer surface of the conical clamping piece (7).
5. The quick-load and quick-unload retrievable anchorage of claim 1, wherein the conical clamp (8) is provided with a bite on the inner surface in contact with the steel strand (11) for engaging the steel strand (11).
6. The quick-install and quick-release retractable anchor device according to claim 1, wherein the bearing disc (9) and the conical clamp (8) are connected by a screw thread.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921275072.1U CN210421087U (en) | 2019-08-07 | 2019-08-07 | Quick-mounting and quick-dismounting type recoverable anchorage device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921275072.1U CN210421087U (en) | 2019-08-07 | 2019-08-07 | Quick-mounting and quick-dismounting type recoverable anchorage device |
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| CN210421087U true CN210421087U (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397034A (en) * | 2019-08-07 | 2019-11-01 | 四川志德岩土工程有限责任公司 | Fast-assembling speed, which unloads formula, can be recycled anchorage and its method for dismounting |
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2019
- 2019-08-07 CN CN201921275072.1U patent/CN210421087U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397034A (en) * | 2019-08-07 | 2019-11-01 | 四川志德岩土工程有限责任公司 | Fast-assembling speed, which unloads formula, can be recycled anchorage and its method for dismounting |
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