CN110842390B - Inhaul cable outer sleeve welding device - Google Patents
Inhaul cable outer sleeve welding device Download PDFInfo
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- CN110842390B CN110842390B CN201911204360.2A CN201911204360A CN110842390B CN 110842390 B CN110842390 B CN 110842390B CN 201911204360 A CN201911204360 A CN 201911204360A CN 110842390 B CN110842390 B CN 110842390B
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- welding
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- outer sleeve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
Abstract
The invention discloses a stay cable outer sleeve welding device which comprises a rail, wherein a walking unit is arranged on the rail, a rotating unit capable of rotating around the central axis of the walking unit is arranged on the walking unit, a welding bracket and an angle adjusting system for adjusting the inclination angle of the welding bracket relative to the horizontal plane are arranged on the rotating unit, and a longitudinal seam welding system for realizing the welding of a single-section outer sleeve and a circular seam welding system for realizing the butt welding of two adjacent-section outer sleeves are arranged on the welding bracket. The invention can provide a matched welding device for the construction process of arranging the outer sleeve on the inhaul cable body in the inhaul cable structure except the steel strand system.
Description
Technical Field
The invention belongs to the technical field of stay cables, and particularly relates to a stay cable outer sleeve welding device.
Background
The outer sleeve of the inhaul cable is made of a high polymer material and has the characteristics of high strength, corrosion resistance, low hardness and repairability. At present, the steel strand is mainly applied to a steel strand stay cable system, and generally, an outer sleeve is firstly installed and then the steel strand is installed. In the stay cable structures such as the parallel steel wire stay cable and the closed cable, after the stay cable is installed, a layer of outer sleeve can be installed later, so that the service life of the stay cable can be prolonged, and the stay cable can be used as a carrier of functional units such as landscape lamps, sensors and the like.
For the outer sleeve structure disclosed in CN109403204A, the form of loading the cable body first and then loading the outer sleeve later is adopted, so the outer sleeve needs to be in the form of slicing and segmenting, and is welded into a sealed and complete sleeve after splicing, and no welding device matched with the construction process of loading the outer sleeve into the cable body after slicing and segmenting is disclosed in the prior art.
Disclosure of Invention
In order to solve the problems, the invention provides a welding device for a stay cable outer sleeve, which adjusts the angle of a welding unit through a walking unit and a rotating unit so as to adapt to different installation positions of the stay cable outer sleeve, completes the splicing of segmented segments by matching with the welding unit, and can provide a matched welding device for the construction process of installing an outer sleeve on a stay cable body in a stay cable structure except a steel strand system.
The invention discloses a stay cable outer sleeve welding device which comprises a rail, wherein a walking unit is arranged on the rail, a rotating unit capable of rotating around the central axis of the walking unit is arranged on the walking unit, a welding bracket and an angle adjusting system for adjusting the inclination angle of the welding bracket relative to the horizontal plane are arranged on the rotating unit, and a longitudinal seam welding system for realizing the welding of a single-section outer sleeve and a circular seam welding system for realizing the butt welding of two adjacent-section outer sleeves are arranged on the welding bracket.
In a preferred embodiment of the present invention, the traveling unit includes a traveling cylinder, a traveling roller and a traveling bracket, the traveling bracket is in sliding fit with the rail through the traveling roller, one end of the traveling cylinder is connected to the traveling bracket, and the other end of the traveling cylinder is connected to the rail.
In a preferred embodiment of the present invention, a travel limiting device matched with the rail is arranged on the travel bracket, the travel limiting device includes a U-shaped connecting plate and limiting rollers, the limiting rollers are arranged on two sides of an open end of the U-shaped connecting plate, and the limiting rollers are in rolling fit with side end faces of the rail.
In a preferred embodiment of the present invention, the rotating unit includes a rotating bracket, a rotating roller and a rotating limiting device, the rotating roller is connected to the traveling unit, the rotating bracket is provided with a guide chute for cooperating with the rotating roller, the guide chute and the rotating bracket are arranged coaxially, and the rotating bracket and the traveling unit are limited up and down by the rotating limiting device.
In a preferred embodiment of the present invention, the angle adjustment system includes a horizontal angle adjustment cylinder and an inclined angle adjustment cylinder, one end of the horizontal angle adjustment cylinder is fixedly connected to the rotating unit, the other end of the horizontal angle adjustment cylinder is hinged to the welding bracket, one end of the inclined angle adjustment cylinder is hinged to the rotating unit, and the other end of the inclined angle adjustment cylinder is hinged to the welding bracket.
In a preferred embodiment of the invention, the longitudinal seam welding system comprises a plurality of pairs of longitudinal seam welding oil cylinders which are arranged at intervals along the radial direction of the cable body, and the movable ends of the longitudinal seam welding oil cylinders which are positioned on the same side are connected with a welding clamp.
In a preferred embodiment of the present invention, the welding jig is semicircular, and a plurality of circumferential ribs and longitudinal stiffeners are provided on an outer peripheral surface of the welding jig.
In a preferred embodiment of the invention, the girth welding system comprises an upper positioning device and a lower positioning device for clamping the welded segment outer sleeves, and a welding device for welding two adjacent segment outer sleeves is arranged between the upper positioning device and the lower positioning device.
In a preferred embodiment of the invention, the distance of the longitudinal seam welding system to the central axis of the rotary unit is smaller than the distance of the circumferential seam welding system to the central axis of the rotary unit.
In a preferred embodiment of the present invention, the track is laid on the ground at a corresponding position according to the position of the stay cable
The invention has the beneficial effects that: the invention not only fills the technical blank of cable body after outer sleeve tube fragmentation and segmentation, but also has simple structure and high universality, and adjusts the space position of a welding system through a rotating unit and an angle adjusting system so as to adapt to the installation of different outer sleeve tubes of the cable; furthermore, the design scheme of the walking unit, the rotating unit and the angle adjusting system disclosed by the invention has a simple structure, can prevent the track from deviating and can be reasonably adjusted according to the position of the cable body; further, the position of the welding support is matched with the girth welding system, the longitudinal seam welding system realizes the quick and synchronous installation of the cable sleeve sections, and the installation efficiency of the cable pipeline is improved.
Drawings
FIG. 1: vertical surface structure schematic diagram suitable for inhaul cable outer sleeve welding device
FIG. 2: schematic plane structure diagram suitable for stay cable outer sleeve welding device
FIG. 3: vertical surface structure schematic diagram of welding unit suitable for stay cable outer sleeve welding device
FIG. 4: welding unit plane structure schematic diagram suitable for inhaul cable outer sleeve welding device
FIG. 5: schematic diagram suitable for welding step S1 of stay cable outer sleeve welding device
FIG. 6: welding steps S2-S3 schematic diagram suitable for stay cable outer sleeve welding device
FIG. 7: schematic diagram suitable for welding step S4 of stay cable outer sleeve welding device
FIG. 8: schematic diagram suitable for welding step S5 of stay cable outer sleeve welding device
FIG. 9: schematic diagram suitable for welding step S6 of stay cable outer sleeve welding device
In the figure: 1-rail, 2-walking unit, 3-rotating unit, 4-welding unit, 2.1-walking oil cylinder, 2.2-walking roller, 2.3-walking limiting device, 2.4-walking bracket, 3.1-rotating bracket, 3.2-rotating roller, 3.3-rotating limiting device, 4.1-welding bracket, 4.2-angle adjusting system, 4.3-longitudinal seam welding system, 4.4-circular seam welding system, 4.2 a-horizontal angle adjusting oil cylinder, 4.2 b-inclined angle adjusting oil cylinder, 4.3 a-longitudinal seam welding oil cylinder, 4.3 b-welding clamp, 4.3 c-circumferential rib, 4.3 d-longitudinal stiffening rib, 4.4 a-upper positioning device, 4.4 b-lower positioning device and 4.4 c-welding device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As can be seen from the attached drawings of the specification of the invention, the invention discloses a stay cable outer sleeve welding device which comprises a rail 1, wherein a walking unit 2 is arranged on the rail 1, a rotating unit 3 capable of rotating around the central axis of the walking unit 2 is arranged on the walking unit 3, a welding bracket 4.1 and an angle adjusting system 4.2 for adjusting the inclination angle of the welding bracket 4.1 relative to the horizontal plane are arranged on the rotating unit 3, and a longitudinal seam welding system 4.3 for realizing the welding of a single-section outer sleeve and a circular seam welding system 4.4 for realizing the butt welding of two adjacent-section outer sleeves are arranged on the welding bracket 4.1. The walking unit 2 comprises a walking oil cylinder 2.1, a walking roller 2.2 and a walking support 2.4, the walking support 2.4 is of a square frame structure, the walking support 2.4 is in sliding fit with the track 1 through the walking roller 2.2, one end of the walking oil cylinder 2.1 is connected with the walking support 2.4, and the other end of the walking oil cylinder is connected with the track 1. The walking support 2.4 is provided with a walking limiting device 2.3 matched with the track 1, the walking limiting device 2.3 comprises a U-shaped connecting plate and limiting idler wheels, the limiting idler wheels are arranged on two sides of the open end of the U-shaped connecting plate, and the limiting idler wheels are in rolling fit with the side end face of the track 1. The rotating unit 3 comprises a rotating support 3.1, a rotating roller 3.2 and a rotating limiting device 3.3, the rotating support 3.1 is of a circular frame structure, the rotating support 3.1 and the traveling support 2.4 are coaxially arranged, the rotating roller 3.2 is connected to the traveling unit 2, the rotating support 3.1 is provided with a guide sliding groove matched with the rotating roller 3.2, the guide sliding groove and the rotating support 3.1 are coaxially arranged, and the rotating support 3.1 and the traveling unit 2 are vertically limited through the rotating limiting device 3.3. The angle adjusting system 4.2 comprises a horizontal angle adjusting oil cylinder 4.2a and an inclined angle adjusting oil cylinder 4.2b, one end of the horizontal angle adjusting oil cylinder 4.2a is fixedly connected with the rotating unit 3, the other end of the horizontal angle adjusting oil cylinder is hinged with the welding support 4.1, one end of the inclined angle adjusting oil cylinder 4.2b is hinged with the rotating unit 3, and the other end of the inclined angle adjusting oil cylinder is hinged with the welding support 4.1. The longitudinal seam welding system 4.3 comprises a plurality of pairs of longitudinal seam welding oil cylinders 4.3a which are arranged at intervals along the radial direction of the cable body, and the movable ends of the longitudinal seam welding oil cylinders 4.3a positioned on the same side are connected with a welding clamp 4.3 b. The welding jig 4.3b is semicircular, and the peripheral surface of the welding jig 4.3b is provided with a plurality of circumferential ribs 4.3c and longitudinal stiffeners 4.3 d. The girth welding system 4.4 comprises an upper positioning device 4.4a and a lower positioning device 4.4b which are used for clamping the welded segment outer sleeves, and a welding device 4.4c used for welding the outer sleeves of two adjacent segments is arranged between the upper positioning device 4.4a and the lower positioning device 4.4 b. The distance from the longitudinal seam welding system 4.3 to the central axis of the rotary unit 3 is smaller than the distance from the circumferential seam welding system 4.4 to the central axis of the rotary unit 3. The track 1 is laid on the corresponding position of the ground according to the position of the stay cable.
An embodiment of the present invention is explained in detail below with reference to the accompanying drawings:
the welding device for the outer sleeve of the inhaul cable comprises a track 1, a walking unit 2, a rotating unit 3 and a welding unit 4. The track 1 is laid at the corresponding position on the ground according to the position of the stay cable. The walking unit 2 consists of a walking oil cylinder 2.1, a walking roller 2.2, a walking limiting device 2.3 and a walking bracket 2.4. The walking support is frame structure, is provided power by walking hydro-cylinder 2.1, and the walking gyro wheel 2.2 that sets up through walking support below moves on track 1, all sets up walking stop device 2.3 in four angular point departments of walking support 2.4, prevents its skew track. The rotating unit 3 consists of a rotating bracket 3.1, a rotating roller 3.2 and a rotating limiting device 3.3, and the upper end of the rotating unit is provided with a welding unit 4. The rotating limiting device 3.3 limits the rotating support 3.1 on the upper end face of the walking unit 2 and is aligned with the walking unit 2, and the rotating unit 3 can rotate along the central shaft of the walking unit 2 through the rotating roller 3.2 fixed on the upper end face of the walking unit. The welding unit 4 consists of a welding support 4.1, an angle adjustment system 4.2, a longitudinal seam welding system 4.3 and a circumferential seam welding system 4.4. Both the longitudinal seam welding system 4.2 and the circumferential seam welding system 4.3 are mounted on a welding unit carrier 4.1. The angle adjusting system consists of three oil cylinders which are matched with each other to adjust the angle of the welding unit. Two horizontal angle-adjusting oil cylinders 4.2a are arranged in parallel, one end of each horizontal angle-adjusting oil cylinder is fixed on the rotating unit 3, the other end of each horizontal angle-adjusting oil cylinder is hinged with the end of the welding support 4.1, and one inclined angle-adjusting oil cylinder 4.2b is arranged between the welding support 4.1 and the rotating unit 3. The longitudinal seam welding system 4.3 comprises a longitudinal seam welding oil cylinder 4.3a and a welding fixture 4.3b, the longitudinal seam welding oil cylinder 4.3a is symmetrically arranged on the welding support 4.1, the extending end is connected with the welding fixture 4.3b, and the peripheral surface of the welding fixture 4.3b is provided with a plurality of circumferential ribs 4.3c and longitudinal stiffening ribs 4.3d, so that the rigidity of the welding fixture 4.3b is increased, and the welding effect is ensured. The girth welding system 4.4 is fixed on the upper end of the welding bracket 4..1 and comprises an upper positioning device 4.4a, a lower positioning device 4.4b and a welding device 4.4 c.
It should be noted that the upper positioning device 4.4a, the lower positioning device 4.4b and the welding device 4.4c disclosed in the present invention are all conventional prior art, the upper positioning device 4.4a and the lower positioning device 4.4b are common tube clamping fixtures, which are used for clamping and positioning the outer sleeves, the welding device 4.4c is used for welding the outer sleeves of two adjacent segments, the welding mode can refer to the outer sleeve of CN109403204A, and the outer sleeves of two adjacent segments are heated and welded by the resistance wires arranged along the axial direction of the outer sleeves on the splicing surface of one assembly unit.
The welding device is used for welding and connecting the installation outer sleeves of the segmented and sliced inhaul cable body, and the specific operation process is as follows:
s1: according to the position of the stay cable a, a track 1 is laid, welding equipment is installed at the initial position of the track, and a welding device is moved to the position of the stay cable a to be installed by a walking unit 2.
S2: the rotating unit 3 is matched with the angle adjusting system 4.2 to adjust the space angle of the longitudinal seam welding system 4.3, so that the central axis of the longitudinal seam welding system 4.3 is superposed with the central axis of the stay cable a.
S3: and moving the temporarily spliced first section of outer sleeve b to a longitudinal joint welding system 4.3, extending out a longitudinal joint welding oil cylinder 4.3a, tightly clamping and wrapping the outer sleeve b by using a welding clamp 4.3b, and electrifying and heating to complete the hot melting welding of the longitudinal joint.
S4: and the longitudinal seam welding oil cylinder 4.3a contracts, and the first section of outer sleeve a is lifted to the position where the lower interface is positioned at the position of the circular seam welding system 4.4a and is temporarily fixed by the upper positioning device 4.4a of the circular seam welding system.
S5: and moving the outer sleeve c temporarily spliced by the lower section to a longitudinal seam welding system 4.3, and finishing the longitudinal seam welding of the outer sleeve c of the lower section by referring to S3.
S6: and moving the lower outer sleeve c up to the lower joint of the upper outer sleeve b, temporarily fixing the lower outer sleeve c by using a lower positioning device 4.4b, and performing girth welding by using a welding device 4.4 c.
S7: and repeating the steps 4-6 to complete the welding and installation of the outer sleeve of the whole inhaul cable.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (9)
1. The utility model provides a cable outer tube welding set which characterized in that: the welding device comprises a track (1), wherein a walking unit (2) is arranged on the track (1), a rotating unit (3) capable of rotating around the central axis of the walking unit (2) is arranged on the walking unit (3), a welding support (4.1) and an angle adjusting system (4.2) used for adjusting the inclination angle of the welding support (4.1) relative to a horizontal plane are arranged on the rotating unit (3), and a longitudinal seam welding system (4.3) used for realizing the welding of a single-section outer sleeve and a circular seam welding system (4.4) used for realizing the butt welding of two adjacent-section outer sleeves are arranged on the welding support (4.1); the angle adjusting system (4.2) comprises a horizontal angle adjusting oil cylinder (4.2 a) and an inclined angle adjusting oil cylinder (4.2 b), one end of the horizontal angle adjusting oil cylinder (4.2 a) is fixedly connected with the rotating unit (3), the other end of the horizontal angle adjusting oil cylinder is hinged with the welding support (4.1), one end of the inclined angle adjusting oil cylinder (4.2 b) is hinged with the rotating unit (3), and the other end of the inclined angle adjusting oil cylinder is hinged with the welding support (4.1).
2. The inhaul cable outer sleeve welding device according to claim 1, wherein: the walking unit (2) comprises a walking oil cylinder (2.1), a walking roller (2.2) and a walking support (2.4), the walking support (2.4) is in sliding fit with the track (1) through the walking roller (2.2), one end of the walking oil cylinder (2.1) is connected with the walking support (2.4), and the other end of the walking oil cylinder is connected with the track (1).
3. The inhaul cable outer sleeve welding device according to claim 2, wherein: the walking support (2.4) is provided with a walking limiting device (2.3) matched with the track (1), the walking limiting device (2.3) comprises a U-shaped connecting plate and limiting idler wheels, the limiting idler wheels are arranged on two sides of the open end of the U-shaped connecting plate, and the limiting idler wheels are matched with the side end face of the track (1) in a rolling mode.
4. The inhaul cable outer sleeve welding device according to claim 1, wherein: rotate unit (3) including rotating support (3.1), rotation gyro wheel (3.2) and rotate stop device (3.3), rotate gyro wheel (3.2) connect in on walking unit (2), rotate support (3.1) be provided with be used for with rotate gyro wheel (3.2) complex direction spout, the direction spout with rotate support (3.1) coaxial arrangement, rotate support (3.1) with pass through between walking unit (2) it is spacing from top to bottom to rotate stop device (3.3).
5. The inhaul cable outer sleeve welding device according to claim 1, wherein: the longitudinal seam welding system (4.3) comprises a plurality of pairs of longitudinal seam welding oil cylinders (4.3 a) which are arranged along the radial direction of the cable body at intervals, and the movable ends of the longitudinal seam welding oil cylinders (4.3 a) positioned on the same side are connected with a welding clamp (4.3 b).
6. The inhaul cable outer sleeve welding device according to claim 5, wherein: the welding fixture (4.3 b) is semicircular, and a plurality of circumferential ribs (4.3 c) and longitudinal stiffening ribs (4.3 d) are arranged on the peripheral surface of the welding fixture (4.3 b).
7. The inhaul cable outer sleeve welding device according to claim 1, wherein: the girth welding system (4.4) comprises an upper positioning device (4.4 a) and a lower positioning device (4.4 b) which are used for clamping the welded section outer sleeve, and a welding device (4.4 c) used for welding two adjacent section outer sleeves is arranged between the upper positioning device (4.4 a) and the lower positioning device (4.4 b).
8. The inhaul cable outer sleeve welding device according to claim 1, wherein: the distance from the longitudinal seam welding system (4.3) to the central shaft of the rotating unit (3) is smaller than the distance from the circular seam welding system (4.4) to the central shaft of the rotating unit (3).
9. The inhaul cable outer sleeve welding device according to claim 1, wherein: the track (1) is laid at the corresponding position on the ground according to the position of the stay cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204360.2A CN110842390B (en) | 2019-11-29 | 2019-11-29 | Inhaul cable outer sleeve welding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911204360.2A CN110842390B (en) | 2019-11-29 | 2019-11-29 | Inhaul cable outer sleeve welding device |
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| Publication Number | Publication Date |
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| CN110842390A CN110842390A (en) | 2020-02-28 |
| CN110842390B true CN110842390B (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911204360.2A Active CN110842390B (en) | 2019-11-29 | 2019-11-29 | Inhaul cable outer sleeve welding device |
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| CN101905368A (en) * | 2010-08-10 | 2010-12-08 | 上海沪工电焊机(集团)有限公司 | Tracking device for tank-type double-gun horizontal circular/longitudinal seam welder |
| CN106342008B (en) * | 2009-09-22 | 2013-02-27 | 上海航天精密机械研究所 | Carrier rocket tank cylinder section is indulged encircling welding equipment |
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| JP2016209904A (en) * | 2015-05-07 | 2016-12-15 | 株式会社第一メカテック | Circumferential weld apparatus |
| CN108747077A (en) * | 2018-06-29 | 2018-11-06 | 中国葛洲坝集团机电建设有限公司 | A kind of adjacent mounting system and method filled out penstock between pier and close up section |
| WO2019045234A1 (en) * | 2017-08-31 | 2019-03-07 | 정찬우 | Combined automatic welding apparatus |
| CN110004835A (en) * | 2019-04-19 | 2019-07-12 | 中交第二航务工程局有限公司 | A kind of suspension cable anchor fixing device and pressure anchor method |
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2019
- 2019-11-29 CN CN201911204360.2A patent/CN110842390B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106342008B (en) * | 2009-09-22 | 2013-02-27 | 上海航天精密机械研究所 | Carrier rocket tank cylinder section is indulged encircling welding equipment |
| CN101905368A (en) * | 2010-08-10 | 2010-12-08 | 上海沪工电焊机(集团)有限公司 | Tracking device for tank-type double-gun horizontal circular/longitudinal seam welder |
| JP2016209904A (en) * | 2015-05-07 | 2016-12-15 | 株式会社第一メカテック | Circumferential weld apparatus |
| CN105710577A (en) * | 2016-01-27 | 2016-06-29 | 安徽天澄钢构有限公司 | Gantry welding machine |
| WO2019045234A1 (en) * | 2017-08-31 | 2019-03-07 | 정찬우 | Combined automatic welding apparatus |
| CN108747077A (en) * | 2018-06-29 | 2018-11-06 | 中国葛洲坝集团机电建设有限公司 | A kind of adjacent mounting system and method filled out penstock between pier and close up section |
| CN110004835A (en) * | 2019-04-19 | 2019-07-12 | 中交第二航务工程局有限公司 | A kind of suspension cable anchor fixing device and pressure anchor method |
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| CN110842390A (en) | 2020-02-28 |
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