CN113882372B - Anchor rod tensioning method after anchor sealing - Google Patents
Anchor rod tensioning method after anchor sealing Download PDFInfo
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- CN113882372B CN113882372B CN202111236383.9A CN202111236383A CN113882372B CN 113882372 B CN113882372 B CN 113882372B CN 202111236383 A CN202111236383 A CN 202111236383A CN 113882372 B CN113882372 B CN 113882372B
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- extension
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention relates to the technical field of anchor rods, and discloses an anchor rod tensioning method after anchor sealing, which comprises the following construction steps: (1) The anchor rod comprises an extension section, a sleeve is arranged on the anchor, and extension steel bars are inserted into the sleeve; (2) Installing a supporting stool at the anchor sealing position, connecting a jack on the supporting stool, connecting a fixing piece on the jack, and clamping an extension steel bar by the fixing piece; (3) And the jack pushes the fixing piece outwards along the outward direction of the extension section, the fixing piece stretches the extension steel bar outwards, and the extension steel bar stretches the sleeve and the anchor outwards. The anchor is fixedly connected with the extension section of the anchor rod, the sleeve is arranged on the anchor, the extension steel bar is inserted into the sleeve, the current situation that the reserved length of the anchor rod is insufficient is changed, the jack is connected to the supporting stool, the jack pushes the fixing piece outwards, the fixing piece stretches the extension steel bar outwards, the extension steel bar stretches the sleeve outwards and the anchor rod, the anchor rod is stretched, and the problem that the reserved length of the anchor rod is insufficient and difficult to stretch is solved.
Description
Technical Field
The invention relates to the technical field of anchor rods, in particular to an anchor rod tensioning method after anchor sealing.
Background
The anchor bolt support is a reinforcing support mode adopted in the construction of surface engineering such as side slopes, rock and soil deep foundation pits and underground chambers such as tunnels and stopes. The rod column is made of metal, wood, polymer or other materials, and is driven into the pre-drilled holes of the rock mass around the surface rock mass or chamber, and the special structures of the head and the rod body and the tail support plate (not needed) are utilized, or the surrounding rock and the stable rock mass are combined together by means of the bonding effect to generate the suspension effect, the combined beam effect and the reinforcing effect so as to achieve the aim of supporting. The method has the advantages of low cost, good supporting effect, simple and convenient operation, flexible use, small occupied construction clearance and the like.
The anchor bolt support is an important form of geotechnical engineering reinforcement, and has been increasingly applied in the field of geotechnical engineering in China due to the advantages of safety, high efficiency, low cost and the like. After the anchor rod in the support system is sealed, the reserved length of the anchor rod is insufficient due to some reasons, and the anchor rod is difficult to stretch. For this situation, there is no better solution.
Disclosure of Invention
The invention aims to provide an anchor rod tensioning method after anchor sealing, and aims to solve the problems that in the prior art, the reserved length of an anchor rod is insufficient and tensioning is difficult to carry out.
The invention discloses an anchor rod tensioning method after anchor sealing, which comprises the following construction steps:
(1) The anchor rod is provided with an extension section exposed out of the building, the extension section is connected with an anchor, the anchor is propped against the outer surface of the building, an extension steel bar and a mounting sleeve are arranged on the anchor, and the lower end of the extension steel bar is inserted into the sleeve and fixedly connected with the sleeve;
(2) The outer surface of the building is provided with a supporting stool, the top of the supporting stool is connected with a jack, the upper end of the extension steel bar penetrates through the supporting stool and the jack from bottom to top, the top of the jack is connected with a fixing piece, the fixing piece is connected with the upper end of the extension steel bar, and the upper end of the extension steel bar and the jack are relatively fixed;
(3) The jack applies downward pressure to the supporting stool, the jack stretches the extension steel bar upwards, and the extension steel bar stretches the sleeve and the anchorage device upwards to the anchor rod.
Further, the sleeve is provided with a sleeve hole, threads are arranged on the inner wall of the sleeve hole, and in the construction step (1), the lower end of the extension steel bar is inserted into the sleeve hole and is in threaded connection with the sleeve hole.
Further, the jack has a hollow region penetrating through a middle region of the jack along an axial direction of the jack, and the extension bar passes through the hollow region in the construction step (2).
Further, the fixing piece comprises a bearing plate arranged at the top of the jack and a clamping block used for clamping the upper end of the extension steel bar, in the construction step (2), the upper end of the extension steel bar passes through the bearing plate after passing through the hollow area of the jack, the clamping block clamps the upper end of the extension steel bar, the clamping block is abutted to the bearing plate from top to bottom, and the upper end of the extension steel bar and the jack are relatively fixed.
Further, in the construction step (1), a plurality of sleeves are arranged on the anchor along the upward direction of the extension section, and the sleeves are arranged around the center of the anchor.
Further, along the upward direction of the extension section, the anchor comprises a fixed part and a movable part positioned above the fixed part, the movable part and the fixed part are movably arranged, the fixed part is fixed on the outer surface of the building, the movable part is provided with an upward end face which is arranged upward, and in the construction step (1), the sleeve is installed on the upward end face;
the extension section passes through the fixed part and is movably connected with the fixed part, the extension section passes through the movable part and is fixedly connected with the movable part, a limiting structure for limiting the downward movement of the movable part relative to the fixed part is arranged between the fixed part and the movable part, in the construction step (3), when the jack stretches the extension reinforcing steel bar upwards, the extension reinforcing steel bar stretches the movable part, and the fixed part keeps a fixed state.
Further, the limiting structure is a spring, the spring is arranged along the axial extension of the anchor rod, in the construction step (3), before the jack stretches the extension steel bar upwards, the spring is in a compressed state, when the jack stretches the extension steel bar upwards, the extension steel bar pulls the movable part to deviate from the fixed part to move upwards, and the spring gradually returns to the original state.
Further, a guide hole is formed in the movable portion, a guide column is arranged on the fixed portion, the guide column and the outer surface of the building are vertically arranged, the guide column penetrates through the guide hole from bottom to top, and in the construction step (3), when the jack stretches the extension steel bar upwards, the extension steel bar pulls the movable portion to move upwards away from the fixed portion, and the movable portion moves upwards along the guide column.
Further, the guide post has and passes movable part and extends to the section that exposes of the top of movable part, the section that exposes is equipped with the block, the top of movable part is sunken to have the block groove, in step (3) of construction, when the jack stretch-draw upward the extension reinforcing bar, the extension reinforcing bar is being pulled the movable part deviates from the fixed part and moves up, the movable part is along the guide post moves up until the block embedding in the block groove, the movable part stops moving.
Further, the movable portion is provided with a plurality of guide holes, the guide holes are arranged around the center of the movable portion, the fixed portion is provided with a plurality of guide posts, the guide posts are arranged around the center of the fixed portion, and the guide posts correspondingly penetrate through the guide holes.
Compared with the prior art, the anchor rod tensioning method after sealing the anchor, provided by the invention, has the advantages that the anchor is fixedly connected with the extension section of the anchor rod, the sleeve is arranged on the anchor, the extension steel bar is inserted into the sleeve, the current situation that the reserved length of the anchor rod is insufficient is changed, the jack is connected to the supporting stool, the jack pushes the fixing piece outwards, the fixing piece stretches the extension steel bar outwards, the sleeve and the anchor are stretched outwards by the extension steel bar, and the anchor rod is tensioned, so that the problem that the reserved length of the anchor rod is insufficient and the tensioning is difficult is solved.
Drawings
FIG. 1 is a construction flow chart of an anchor rod tensioning method after anchor sealing;
FIG. 2 is a construction schematic diagram of the method for stretching the anchor rod after the anchor sealing;
FIG. 3 is a schematic illustration of an anchor of the method of tensioning an anchor rod after sealing the anchor provided by the invention;
in the figure: anchor bar 100, extension 101, construct 102, anchor 103, free 104, anchor 105, extension 106, sleeve 107, support stool 108, jack 109, sleeve hole 110, hollow area 111, bearing plate 112, clamp block 113, fixed portion 114, movable portion 115, upward facing surface 116, spring 117, guide post 118, exposed 119, snap block 120, snap groove 121, guide surface 122.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1 to 3, a preferred embodiment of the present invention is provided.
The method for stretching the anchor rod after the anchor sealing comprises the following construction steps:
(1) The anchor rod 100 is provided with a built-in section and an extension section 101, the built-in section is positioned on the inner side of the building 102, the built-in section is divided into an anchoring section 103 and a free section 104, the anchoring section 103 is a section with the built-in section facing inwards and is fixedly connected with the building 102, the free section 104 is a section with the built-in section facing outwards and is not directly connected with the building 102, the extension section 101 is exposed on the outer side of the building 102, the extension section 101 is connected with an anchor 105, the anchor 105 is pressed against the outer surface of the building 102, an extension steel bar 106 and a mounting sleeve 107 are arranged on the anchor 105, and the lower end of the extension steel bar 106 is inserted into the sleeve 107 and is fixedly connected with the sleeve 107;
when the anchor rod 100 is tensioned, the extension steel bar 106 is tensioned outwards, and the sleeve 107 and the anchorage 105 fixedly connected with the extension steel bar 106 give the outward tension to the extension section 101, so that the free section 104 is tensioned, and the tensioning of the anchor rod 100 is completed.
(2) The outer surface of the building 102 is provided with a supporting stool 108, the supporting stool 108 is arranged vertical to the outer surface of the building 102, the top of the supporting stool 108 is fixedly connected with a jack 109, the top of the supporting stool 108 is fixedly connected with the bottom of the jack 109, the jack 109 is arranged vertical to the top of the supporting stool 108, an anchor 105 is positioned inside the supporting stool 108, the upper end of an extension steel bar 106 connected with a sleeve 107 on the anchor 105 penetrates through the supporting stool 108 and the jack 109 from bottom to top, the top of the jack 109 is connected with a fixing piece, the fixing piece is connected with the upper end of the extension steel bar 106, and the upper end of the extension steel bar 106 is relatively fixed with the jack 109;
when the anchor rod 100 is tensioned, the top of the jack 109 is pushed upwards along the axial direction of the jack 109, the fixing piece positioned at the top of the jack 109 moves upwards under the pushing of the jack 109, the extension steel bar 106 fixedly connected with the fixing piece at the upper end is pulled upwards by the fixing piece, the tensioning of the anchor rod 100 is completed, the supporting stool 108 fixedly connected with the bottom of the jack 109 is used as a base of the jack 109, and the jack 109 is ensured not to deviate in position in the upward pushing process.
(3) The jack 109 can exert downward pressure on the supporting stool 108 while being ejected upwards, the jack 109 stretches the extension steel bar 106 upwards, and the extension steel bar 106 stretches the anchor rod 100 upwards through the stretching sleeve 107 and the anchor 105.
The anchor 105 is fixedly connected with the extension section 101 of the anchor rod 100, the sleeve 107 is arranged on the anchor 105, the extension steel bar 106 is inserted into the sleeve 107, the current situation that the reserved length of the anchor rod 100 is insufficient is changed, the jack 109 is connected to the supporting stool 108, the jack 109 pushes the fixing piece outwards, the fixing piece stretches the extension steel bar 106 outwards, the extension steel bar 106 stretches the sleeve 107 and the anchor 105 outwards, so that the anchor rod 100 is stretched, and the problems that the reserved length of the anchor rod 100 is insufficient and the stretching is difficult are solved.
The sleeve 107 has a sleeve hole 110, the inner wall of the sleeve hole 110 is provided with threads, the lower end of the extension bar 106 is in threaded connection with the sleeve hole 110, and in the construction step (1), the lower end of the extension bar 106 is inserted into the sleeve hole 110, and the extension bar 106 is rotated clockwise until the lower end of the extension bar 106 is firmly connected with the sleeve hole 110.
Along the axial direction of the jack 109, the jack 109 has a hollow region 111, the hollow region 111 penetrates through the middle region of the jack 109, and in the construction step (2), the extension bar 106 penetrates through the hollow region 111, thereby avoiding direct contact between the extension bar 106 and the jack 109.
The mounting includes bearing plate 112 and grip block 113, and bearing plate 112 sets up at the top of jack 109, and grip block 113 is located the top of bearing plate 112, and bearing plate 112 is used for bearing the thrust of jack 109, and grip block 113 is used for the upper end of centre gripping extension bar 106, and in construction step (2), the upper end of extension bar 106 passes behind the hollow zone 111 of jack 109, passes bearing plate 112, and the upper end of grip block 113 centre gripping extension bar 106, and grip block 113 top-down butt is on bearing plate 112, and the upper end and the jack 109 relative fixed of extension bar 106.
In the construction step (3), when the jack 109 is pushed up along the axial direction of the jack 109, an upward thrust is given to the bearing plate 112, the bearing plate 112 gives an upward thrust to the clamping block 113, the clamping block 113 stretches the extension steel bar 106 upward, and the extension steel bar 106 stretches the anchor rod 100 upward through the stretching sleeve 107 and the anchor 105.
In the construction step (1), along the upward direction of the extension section 101, a plurality of sleeves 107 are arranged on the anchor 105, the plurality of sleeves 107 are arranged around the center of the anchor 105, a plurality of extension bars 106 are correspondingly inserted into the plurality of sleeves 107, in the construction step (3), the plurality of extension bars 106 arranged around the center of the anchor 105 can stretch the anchor 105 better, and further stretch the anchor rod 100, so that the problem that the transverse stress of the anchor 105 and the anchor rod 100 is unbalanced in the stretching process is avoided.
Along the upward direction of the extension 101, the anchor 105 comprises a fixed part 114 and a movable part 115, the fixed part 114 is fixed on the outer surface of the construct 102, the movable part 115 is located above the fixed part 114, the movable part 115 is movably arranged between the movable part 115 and the fixed part 114, the movable part 115 has an upward facing end surface 116 arranged upward, and in the construction step (1), the sleeve 107 is mounted on the upward facing end surface 116.
The extension section 101 passes through the fixed part 114 and is movably connected with the fixed part 114, the extension section 101 passes through the movable part 115 and is fixedly connected with the movable part 115, a limiting structure is arranged between the fixed part 114 and the movable part 115 and is used for limiting the movable part 115 to move downwards relative to the fixed part 114, in the construction step (3), when the jack 109 stretches the extension steel bar 106 upwards, the extension steel bar 106 stretches the movable part 115, the fixed part 114 keeps a fixed state, the extension steel bar 106 pulls the movable part 115 to move upwards away from the fixed part 114, and the movable part 115 stretches the extension section 101 of the anchor rod 100 upwards, so that the stretching of the anchor rod 100 is completed.
The limiting structure is a spring 117, the spring 117 extends along the axial direction of the anchor rod 100, the top end of the spring 117 is fixedly connected with the bottom of the movable portion 115, the bottom end of the spring 117 is fixedly connected with the top of the fixed portion 114, in the construction step (3), before the jack 109 stretches the extension steel bar 106 upwards, the spring 117 is in a compressed state, the fixed portion 114 gives the movable portion 115 an upward supporting force through the spring 117, and when the jack 109 stretches the extension steel bar 106 upwards, the extension steel bar 106 pulls the movable portion 115 to move upwards away from the fixed portion 114, and the spring 117 gradually returns to the original state.
The movable part 115 is provided with a guide hole, the fixed part 114 is provided with a guide post 118 which is correspondingly arranged with the guide hole, the fixed part 114 is provided with a guide surface 122 which faces the movable part 115, the bottom of the guide post 118 is fixedly connected with the guide surface 122, the guide post 118 is vertical to the guide surface 122 and faces the movable part 115, the guide post 118 is vertically arranged with the outer surface of the building 102, the guide post 118 penetrates through the guide hole from bottom to top, the guide post 118 is movably connected with the guide hole, in the construction step (3), the guide post 118 is matched with the guide hole, when the jack 109 stretches the extension steel bar 106 upwards, the extension steel bar 106 pulls the movable part 115 to move upwards away from the fixed part 114, the movable part 115 moves upwards along the guide post 118, and the transverse position deviation of the movable part 115 in the upward moving process is avoided.
The guide post 118 has the exposed section 119, the exposed section 119 passes movable part 115 and extends to the top of movable part 115, exposed section 119 and movable part 115 swing joint, the top of exposed section 119 is equipped with block 120, the top of movable part 115 is sunken to have block groove 121, in step (3), jack 109 stretch-draw extension bar 106 up when, extension bar 106 is pulling movable part 115 and is deviating from fixed part 114 and upwards moving, movable part 115 upwards moves along guide post 118 until block 120 imbeds in block groove 121, movable part 115 stops moving, avoid the excessive stretch-draw to stock 100.
The movable portion 115 is provided with a plurality of guide holes, the plurality of guide holes are arranged around the center of the movable portion 115, the fixed portion 114 is provided with a plurality of guide posts 118, the bottoms of the plurality of guide posts 118 are fixedly connected with the guide surfaces 122, the plurality of guide posts 118 are perpendicular to the guide surfaces 122 and face the movable portion 115, the plurality of guide posts 118 are arranged around the center of the fixed portion 114, the plurality of guide posts 118 correspondingly pass through the plurality of guide holes, in the construction step (3), the plurality of guide posts 118 are matched with the plurality of guide holes, when the jack 109 stretches the extension steel bar 106 upwards, the extension steel bar 106 pulls the movable portion 115 to move upwards away from the fixed portion 114, the movable portion 115 moves upwards along the plurality of guide posts 118, and the plurality of guide posts 118 enable the movement of the movable portion 115 to be more stable and the movement direction of the movement to be difficult to occur.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The method for stretching the anchor rod after the anchor sealing is characterized by comprising the following construction steps:
(1) The anchor rod is provided with an extension section exposed out of the building, the extension section is connected with an anchor, the anchor is propped against the outer surface of the building, an extension steel bar and a mounting sleeve are arranged on the anchor, and the lower end of the extension steel bar is inserted into the sleeve and fixedly connected with the sleeve;
(2) The outer surface of the building is provided with a supporting stool, the top of the supporting stool is connected with a jack, the upper end of the extension steel bar penetrates through the supporting stool and the jack from bottom to top, the top of the jack is connected with a fixing piece, the fixing piece is connected with the upper end of the extension steel bar, and the upper end of the extension steel bar and the jack are relatively fixed;
(3) The jack stretches the extension steel bar upwards while applying downward pressure to the supporting stool, and the extension steel bar stretches the sleeve and the anchorage device upwards to stretch the anchor rod;
the sleeve is provided with a sleeve hole, the inner wall of the sleeve hole is provided with threads, and in the construction step (1), the lower end of the extension steel bar is inserted into the sleeve hole and is in threaded connection with the sleeve hole;
along the upward direction of the extension section, the anchorage comprises a fixed part and a movable part positioned above the fixed part, the movable part and the fixed part are movably arranged, the fixed part is fixed on the outer surface of the building, the movable part is provided with an upward end face which is arranged upward, and in the construction step (1), the sleeve is arranged on the upward end face;
the extension section passes through the fixed part and is movably connected with the fixed part, the extension section passes through the movable part and is fixedly connected with the movable part, a limiting structure for limiting the downward movement of the movable part relative to the fixed part is arranged between the fixed part and the movable part, in the construction step (3), when the jack stretches the extension reinforcing steel bar upwards, the extension reinforcing steel bar stretches the movable part, the fixed part keeps a fixed state, the extension reinforcing steel bar pulls the movable part to move upwards away from the fixed part, and the movable part stretches the extension section of the anchor rod upwards;
the limiting structure is a spring, the spring is arranged along the axial extension of the anchor rod, in the construction step (3), before the jack stretches the extension steel bar upwards, the spring is in a compressed state, when the jack stretches the extension steel bar upwards, the extension steel bar pulls the movable part to move upwards away from the fixed part, and the spring gradually returns to the original state;
the movable part is provided with a guide hole, the fixed part is provided with a guide column, the guide column and the outer surface of the building are vertically arranged, the guide column passes through the guide hole from bottom to top, and in the construction step (3), when the jack stretches the extension steel bar upwards, the extension steel bar pulls the movable part to deviate from the fixed part to move upwards, and the movable part moves upwards along the guide column.
2. A method of tensioning a bolt after sealing an anchor as claimed in claim 1, wherein the jack has a hollow region extending through a central region of the jack in an axial direction of the jack, and wherein in the step (2) the elongate steel bar passes through the hollow region.
3. The method of tensioning a bolt after sealing an anchor according to claim 2, wherein the fixing member comprises a bearing plate provided at a top of the jack and a clamping block for clamping an upper end of the extension bar, and in the construction step (2), the upper end of the extension bar passes through the bearing plate after passing through the hollow area of the jack, the clamping block clamps the upper end of the extension bar, the clamping block abuts against the bearing plate from top to bottom, and the upper end of the extension bar and the jack are relatively fixed.
4. A method of tensioning a bolt after closing an anchor according to any one of claims 1 to 3, wherein in the construction step (1), a plurality of sleeves are provided on the anchor in the upward direction of the extension, the plurality of sleeves being arranged around the centre of the anchor.
5. A method of tensioning a bolt after closing an anchor according to any one of claims 1 to 3, wherein the guide post has an exposed section passing through the movable portion and extending above the movable portion, the exposed section having a block, the top of the movable portion being recessed with a block groove, and in the step (3) of constructing, when the jack stretches the extension bar upwardly, the extension bar pulls the movable portion to move upwardly away from the fixed portion, and the movable portion moves upwardly along the guide post until the block is embedded in the block groove, and the movable portion stops moving.
6. A method of tensioning a bolt after closing an anchor according to any one of claims 1 to 3, wherein the movable portion is provided with a plurality of guide holes, the plurality of guide holes are arranged around the center of the movable portion, the fixed portion is provided with a plurality of guide posts, the plurality of guide posts are arranged around the center of the fixed portion, and the plurality of guide posts correspondingly pass through the plurality of guide holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111236383.9A CN113882372B (en) | 2021-10-22 | 2021-10-22 | Anchor rod tensioning method after anchor sealing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111236383.9A CN113882372B (en) | 2021-10-22 | 2021-10-22 | Anchor rod tensioning method after anchor sealing |
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| CN113882372A CN113882372A (en) | 2022-01-04 |
| CN113882372B true CN113882372B (en) | 2023-05-05 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2992252B2 (en) * | 1997-08-07 | 1999-12-20 | 黒沢建設株式会社 | Ground anchor head fixing device |
| CN102108703B (en) * | 2010-12-20 | 2012-08-15 | 中铁隧道集团有限公司 | Adjustable prestressed anchoring device |
| CN204475321U (en) * | 2015-01-14 | 2015-07-15 | 姚炳祥 | A kind of main muscle Recyclable anchor rope |
| CN110761283A (en) * | 2019-12-03 | 2020-02-07 | 山东建勘集团有限公司 | Anchor rod compensation tensioning device |
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