CN110453601A - A kind of steel strand stay cable - Google Patents
A kind of steel strand stay cable Download PDFInfo
- Publication number
- CN110453601A CN110453601A CN201910679911.4A CN201910679911A CN110453601A CN 110453601 A CN110453601 A CN 110453601A CN 201910679911 A CN201910679911 A CN 201910679911A CN 110453601 A CN110453601 A CN 110453601A
- Authority
- CN
- China
- Prior art keywords
- pipe
- steel strand
- built
- steel
- stay cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 230000009970 fire resistant effect Effects 0.000 claims abstract description 24
- 210000002435 tendon Anatomy 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 8
- 125000006850 spacer group Chemical group 0.000 claims abstract description 4
- 239000003063 flame retardant Substances 0.000 claims description 7
- 229920001903 high density polyethylene Polymers 0.000 claims description 7
- 239000000839 emulsion Substances 0.000 claims description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 229920006334 epoxy coating Polymers 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 238000001192 hot extrusion Methods 0.000 claims description 2
- -1 polyethylene Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000004700 high-density polyethylene Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/10—Ducts
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
A kind of steel strand stay cable, solve the problems, such as that existing fireproof steel strand stay cable weight is big, its technical solution includes prestressing tendon, built-in pipe and outer tube, one end of built-in pipe is fixed in beam, at least one layer of fire resistant flexible layer is closely coated on the outside of the segment section of prestressing tendon, fire resistant flexible layer part is located in the built-in pipe, part exposes to outside built-in pipe, the outside spacers for exposing to the fire resistant flexible layer of built-in pipe are arranged with steel sleeve, outer tube is sheathed on the outside of the prestress wire, and the upper end of steel sleeve is connect with the lower end of the outer tube, the lower end of steel sleeve is connect with the end that built-in pipe exposes to beam face.The advantages of steel strand stay cable of the invention, is to be coated with fire resistant flexible layer in the prestressing tendon in the region close to beam face, the height of the fire resistant flexible layer can be designed according to actual condition, and the material used is less, and structure is simple, it is easy for installation, meet engineering actual demand.
Description
Technical field
The present invention relates to a kind of steel strand stay cables.
Background technique
Steel strand stay cable has been widely used in the communal facilitys engineering such as bridge, building in the prior art.Steel strand inclined
The outer layer of drag-line is high density polyethylene (HDPE) protective case, and primarily serving prevents its internal drag-line from being acted on by corrosion-resistant, but high density
Polyethylene is combustible, by be struck by lightning, car accident, artificial destruction when, easily burn and wreck, influence engineering structure
The safety of operation.
The patent application document that application publication number is CN107558369A discloses a kind of Fireproof guy cable and preparation method thereof,
The program is used is arranged inside and outside bushing pipe outside drag-line, and the structure of fireprotection layer is arranged inside, between outer liner tube.In this way
Although solving the problems, such as that steel strand stay cable outer jointing jacket is inflammable, but there are also some disadvantages: 1) largely increasing
Drag-line self weight, influences the use state of entire drag-line；2) structure is complicated, and production and installation are inconvenient, is added significantly to engineering and makes
Valence.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of quality is small, it is easily installed and the steel with fire-proof function
Twisted wire suspension cable.
The technical scheme of the invention to solve the technical problem is:
One end of a kind of steel strand stay cable, including prestressing tendon, built-in pipe and outer tube, the built-in pipe is solid
It is scheduled in beam, the end of the prestressing tendon is located in the built-in pipe and extends outwardly from the built-in pipe, special
Sign is: at least one layer of fire resistant flexible layer is closely coated on the outside of the segment section of the prestressing tendon, it is described flexible anti-
Fire bed part is located in the built-in pipe, partially exposes to the built-in pipe, exposes to the fire resistant flexible layer of the built-in pipe
Outside spacers are arranged with steel sleeve, and the outer tube is sheathed on the outside of the prestress wire, and the steel sleeve
Upper end is connect with the lower end of the outer tube, and the lower end of the steel sleeve is connect with the end that the built-in pipe exposes to beam face.
Preferably, the fire resistant flexible layer is the composite material of ceramic fibre and inorganic endothermic material.
Preferably, vertical height (H) of the upper end of the steel sleeve apart from beam face is 3m-50m.
Preferably, connecting tube is additionally provided between the steel sleeve and outer tube, the upper end of the connecting tube and outer tube
End connection, fixing pipe connect with the end of the steel sleeve, and the inner wall of the fixing pipe is equipped with projecting radially inward
Locating piece, the connecting tube lower end insertion be located at the fixing pipe in and be butted on the locating piece.
In order to avoid rainwater enters in steel sleeve between connecting tube and fixing pipe, the fixing pipe and the connecting tube
The outer sheath of junction is equipped with seal pipe, and the lower end edge of the seal pipe is equipped with the fixture block projected radially inward, described solid
The outer surface for determining pipe is equipped with card slot corresponding with the fixture block, the outer surface of the inner surface of the seal pipe and the connecting tube
Between be equipped with elastic seal ring.
Preferably, the seal pipe is two fixture blocks with semi-circular cavity, the cavity of described two fixture blocks is opposite
It is arranged and is closely affixed on the outside of the fixing pipe and the connecting tube junction and mutually locks.
Preferably, the inner wall of the connecting tube and the seal pipe fits closely, the inner wall of the seal pipe is equipped with
Annular groove, the elastic seal ring interference are filled in the annular groove.
Preferably, steel strand wires in the prestressing tendon be smooth surface steel strand wires, it is epoxy coating strand, zinc-plated
One of steel strand wires and zinc-aluminium-alloy steel strand wires；The hot extrusion Flame-retardant Hdpe sheath outside steel strand wires, or in steel
Fire-retardant grease is coated or fills outside twisted wire, reheating squeezes Flame-retardant Hdpe sheath.
Preferably, the number of plies of the fire resistant flexible layer is 1-5 layers.
Compared with prior art, the advantages of steel strand stay cable in the present invention, is answering in advance close to the region in beam face
Power steel wire bundle outer cladding fire resistant flexible layer and housing steel sleeve make the steel strand stay cable have fire prevention and collision prevention function,
And the fire resistant flexible layer can adjust its height according to actual condition, and the material used is less, avoid the steel strand stay cable mistake
Weight, the structure of the steel strand stay cable is simple, easy for installation, and materials and production are easily achieved, and cost is low, meets engineering reality
Border demand.
Detailed description of the invention
Fig. 1 is the structural schematic diagram in the steel strand stay cable nearly beam face region in the embodiment of the present invention；
Fig. 2 is the radial cross-section of the steel strand stay cable steel bushing pipeline section in the embodiment of the present invention；
Fig. 3 is the enlarged diagram in Fig. 1 at A；
Fig. 4 is the structural schematic diagram of the fixing pipe in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the seal pipe in the embodiment of the present invention.
In figure, 1, prestressing tendon；2, built-in pipe；3, outer tube；41, fire resistant flexible layer；42, steel sleeve；43, solid
Fixed pipe；431, locating piece；432, card slot；5, connecting tube；6, seal pipe；61, fixture block；62, annular groove；7, elastic seal ring.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
A kind of steel strand stay cable, as shown in Figure 1-3, including prestressing tendon 1, built-in pipe 2 and outer tube 3, in advance
One end of pipe laying 2 is fixed in beam, and the end of prestressing tendon 1 is located in built-in pipe 2 and extends outwardly from built-in pipe, in advance
It is closely coated at least one layer of fire resistant flexible layer 41 on the outside of the segment section of prestress steel strand beam 1,41 part of fire resistant flexible layer is located at
In built-in pipe 2, built-in pipe 2 is partially exposed to, the outside spacers for exposing to the fire resistant flexible layer 41 of built-in pipe 2 are arranged with steel sleeve
42, outer tube 3 is sheathed on the outside of prestressing tendon 1, and the upper end of steel sleeve 42 is connect with the lower end of outer tube 3,
The lower end of steel sleeve 42 is connect with the end that built-in pipe 2 exposes to ground.
According to the application environment of steel strand stay cable, most of fire are because vehicle or artificial reason cause, therefore fire
The region for jeopardizing steel strand stay cable is generally nearly beam face region, and therefore, firebreak device is set in the region, can be according to reality
The height of border operating condition design and adjustment firebreak device makes steel strand stay cable have fire-proof function, and increase that will not be excessive
The weight of steel strand stay cable.
Further, vertical height H of the upper end of steel sleeve 42 apart from ground is 3m-50m, and wherein 5m-10m is preferable, this
Altitude range can be determined according to factors such as applying working condition, the fire risk degree of steel strand stay cable.
In conjunction with shown in Fig. 4 and Fig. 5, it is additionally provided with connecting tube 5 between steel sleeve 42 and outer tube 3, the upper end of connecting tube 5 and outer
The end of casing 3 is docked and is welded and fixed with one heart, and the lower end of fixing pipe 43 and the upper end of steel sleeve 42 are concentric to dock and weld solid
Fixed, the inner wall of fixing pipe 43 is equipped with the locating piece 431 projected radially inward, and the lower end insertion of connecting tube 5 is located at fixing pipe
It in 43 and is butted on the locating piece 431, so that outer tube 3 be avoided to slide in steel sleeve 42 along the inner wall of fixing pipe 43.
In order to avoid rainwater enters firebreak device, fixing pipe 43 and the outer sheath of 5 junction of connecting tube are equipped with seal pipe 6,
The lower end edge of seal pipe 6 is equipped with the fixture block 61 projected radially inward, and the outer surface of fixing pipe 43 is equipped with corresponding with fixture block
Card slot 432, fixture block 61 is caught in card slot 432, and it is close that elasticity is equipped between the inner surface of seal pipe 6 and the outer surface of connecting tube 5
Seal 7 can prevent rainwater from entering firebreak device between fixing pipe 43 and connecting tube 5.Specifically, connecting tube 5 with it is described close
The inner wall of tube sealing 6 fits closely, and the inner wall of seal pipe 6 is equipped with annular groove 62, and it is recessed that the annular is filled in 7 interference of elastic seal ring
In slot 62.Those skilled in the art is it is to be appreciated that annular groove 62 can also be set in connecting tube 5, as long as elastic seal ring 7
It is filled in the annular groove 62 by the extrusion deformation interference from connecting tube 5 and seal pipe 6, waterproof sealing can be played
Effect.The lower end of steel sleeve 42 axially extends after being gradually increased towards opening direction radial dimension and is sheathed on outside built-in pipe 2,
It is welded and fixed with built-in pipe 2, can prevent rainwater from entering firebreak device between built-in pipe 2 and steel sleeve 42.
Specifically, seal pipe 6 is two fixture blocks with semi-circular cavity, and the cavity of two fixture blocks is oppositely arranged, and
It is closely affixed on the outside of fixing pipe 43 and 5 junction of connecting tube and is mutually locked by bolt.When installation, by connecting tube 5 along pre-
Prestress steel strand beam 1 is mobile and is inserted into fixing sleeve, and the bottom of connecting tube 5 abuts on the locating piece 431 of fixing pipe 43, will seal
Two fixture blocks of pipe 6 are opposite, and adjustment elastic seal ring 7 makes in the annular groove 62 of 7 embedding sealing pipe of elastic seal ring, 6 inner wall, adjust
The mounting height of whole seal pipe 6 is caught in the fixture block 61 of 6 lower end of seal pipe in the card slot 432 of fixing pipe 43, then uses bolt lock
Grip block.
Fire resistant flexible layer 41 is the composite material of ceramic fibre and inorganic endothermic material, and the number of plies of fire resistant flexible layer 41 is 1-
5 layers.
Soap-free emulsion polymeization smooth surface steel strand wires, epoxy coating strand, soap-free emulsion polymeization can be used in steel strand wires in prestressing tendon 1
One of galvanized strand wires and soap-free emulsion polymeization zinc-aluminium-alloy steel strand wires.It, can also be hot outside steel strand wires for non-bending steel cable
It squeezes Flame-retardant Hdpe sheath or fire-retardant grease is coated or filled outside steel strand wires, reheating squeezes flame-proof polyethylene shield
Set, further to improve the fire protecting performance of suspension cable.
Compared with prior art, the advantages of steel strand stay cable in the present invention, is answering in advance close to the region in beam face
Power steel wire bundle outer cladding fire resistant flexible layer and housing steel sleeve make the steel strand stay cable have fire prevention and collision prevention function,
And the fire resistant flexible layer can adjust its height according to actual condition, and the material used is less, avoid the steel strand stay cable mistake
Weight, the structure of the steel strand stay cable is simple, easy for installation, and materials and production are easily achieved, and cost is low, meets engineering reality
Border demand.
Although the preferred embodiment of the present invention has been described in detail above, it is to be clearly understood that for this field
Technical staff for, the invention may be variously modified and varied.Done within the spirit and principles of the present invention
What modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of steel strand stay cable, including prestressing tendon (1), built-in pipe (2) and outer tube (3), the built-in pipe
(2) one end is fixed in beam, and the end of the prestressing tendon (1) is located in the built-in pipe (2) and from described pre-
Pipe laying (2) extends outwardly, it is characterised in that: at least one is closely coated on the outside of the segment section of the prestressing tendon (1)
Layer fire resistant flexible layer (41), the fire resistant flexible layer (41) are partially located in the built-in pipe (2), partially expose to described pre-buried
It manages (2), the outside spacers for exposing to the fire resistant flexible layer (41) of the built-in pipe (2) are arranged with steel sleeve (42), the housing
Pipe (3) is sheathed on the outside of the prestressing tendon (1), and the upper end of the steel sleeve (42) and the outer tube
(3) lower end connection, the lower end of the steel sleeve (42) is connect with the end that the built-in pipe (2) exposes to beam face.
2. steel strand stay cable as described in claim 1, it is characterised in that: the fire resistant flexible layer (41) be ceramic fibre and
The composite material of inorganic endothermic material.
3. steel strand stay cable as described in claim 1, it is characterised in that: the upper end of the steel sleeve (42) is apart from beam face
Vertical height (H) is 3m-50m.
4. steel strand stay cable as described in any one of claims 1-3, it is characterised in that: the steel sleeve (42) and outer tube
(3) be additionally provided between connecting tube (5), the upper end of the connecting tube (5) is connect with the end of outer tube (3), fixing pipe (43) with
The end of the steel sleeve (42) connects, and the inner wall of the fixing pipe (43) is equipped with the locating piece projected radially inward
(431), the lower end insertion of the connecting tube (5) is located in the fixing pipe (43) and is butted on the locating piece (431).
5. steel strand stay cable as claimed in claim 4, it is characterised in that: the fixing pipe (43) and the connecting tube (5)
The outer sheath of junction is equipped with seal pipe (6), and the lower end edge of the seal pipe (6) is equipped with the fixture block projected radially inward
(61), the outer surface of the fixing pipe (43) is equipped with card slot (432) corresponding with the fixture block (61), the seal pipe (6)
Inner surface and the connecting tube (5) outer surface between be equipped with elastic seal ring (7).
6. steel strand stay cable as claimed in claim 5, it is characterised in that: the seal pipe (6), which is two, has semicircle
The cavity of the fixture block of cavity, described two fixture blocks is oppositely arranged and is closely affixed on the fixing pipe (43) and the connecting tube
(5) it the outside of junction and mutually locks.
7. steel strand stay cable as claimed in claim 5, it is characterised in that: the connecting tube (5) and the seal pipe (6)
Inner wall fits closely, and the inner wall of the seal pipe (6) is equipped with annular groove (62), elastic seal ring (7) the interference filling
In the annular groove (62).
8. steel strand stay cable as described in claim 1, it is characterised in that: the steel in the prestressing tendon (1) twists
Line is epoxy coating strand, soap-free emulsion polymeization smooth surface steel strand wires, soap-free emulsion polymeization galvanized strand wires and soap-free emulsion polymeization zinc-aluminium-alloy steel strand wires
One of；For non-bending steel cable, can also outside steel strand wires hot extrusion Flame-retardant Hdpe sheath, or in steel strand wires
Fire-retardant grease is filled in outer coating, and reheating squeezes flame-proof polyethylene sheath.
9. steel strand stay cable as described in claim 1, it is characterised in that: the number of plies of the fire resistant flexible layer is 1-5 layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910679911.4A CN110453601A (en) | 2019-07-26 | 2019-07-26 | A kind of steel strand stay cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910679911.4A CN110453601A (en) | 2019-07-26 | 2019-07-26 | A kind of steel strand stay cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110453601A true CN110453601A (en) | 2019-11-15 |
Family
ID=68483664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910679911.4A Pending CN110453601A (en) | 2019-07-26 | 2019-07-26 | A kind of steel strand stay cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110453601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802456A (en) * | 2021-09-10 | 2021-12-17 | 中国十七冶集团有限公司 | Stay cable anticorrosion protective sleeve and operation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009861A2 (en) * | 2006-07-19 | 2008-01-24 | Mecanique Application Tissus Mecatiss | Sheath section for a structural cable and associated processes |
| JP2011064010A (en) * | 2009-09-17 | 2011-03-31 | Giken Kanri:Kk | Fire resistive covering structure of prestressing steel, and method for constructing the same |
| WO2012052796A1 (en) * | 2010-10-19 | 2012-04-26 | Soletanche Freyssinet | Structural cable with fire protection |
| JP2013256985A (en) * | 2012-06-12 | 2013-12-26 | Kurimoto Ltd | Earthquake-proof joint structure for cable protective tube |
| US20170001404A1 (en) * | 2015-06-30 | 2017-01-05 | Vsl International Ag | Cylindrical thermal protection sheath |
| CN205934724U (en) * | 2016-08-04 | 2017-02-08 | 江阴法尔胜住电新材料有限公司 | Steel strand wires suspension cable outer tube that anticollision was decreased |
| CN109944157A (en) * | 2019-03-18 | 2019-06-28 | 江阴法尔胜住电新材料有限公司 | The device and installation method of a kind of pair of suspension cable setting flameproof protection |
| CN211200082U (en) * | 2019-07-26 | 2020-08-07 | 江阴法尔胜住电新材料有限公司 | Steel strand stay cable |
-
2019
- 2019-07-26 CN CN201910679911.4A patent/CN110453601A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009861A2 (en) * | 2006-07-19 | 2008-01-24 | Mecanique Application Tissus Mecatiss | Sheath section for a structural cable and associated processes |
| JP2011064010A (en) * | 2009-09-17 | 2011-03-31 | Giken Kanri:Kk | Fire resistive covering structure of prestressing steel, and method for constructing the same |
| WO2012052796A1 (en) * | 2010-10-19 | 2012-04-26 | Soletanche Freyssinet | Structural cable with fire protection |
| JP2013256985A (en) * | 2012-06-12 | 2013-12-26 | Kurimoto Ltd | Earthquake-proof joint structure for cable protective tube |
| US20170001404A1 (en) * | 2015-06-30 | 2017-01-05 | Vsl International Ag | Cylindrical thermal protection sheath |
| CN205934724U (en) * | 2016-08-04 | 2017-02-08 | 江阴法尔胜住电新材料有限公司 | Steel strand wires suspension cable outer tube that anticollision was decreased |
| CN109944157A (en) * | 2019-03-18 | 2019-06-28 | 江阴法尔胜住电新材料有限公司 | The device and installation method of a kind of pair of suspension cable setting flameproof protection |
| CN211200082U (en) * | 2019-07-26 | 2020-08-07 | 江阴法尔胜住电新材料有限公司 | Steel strand stay cable |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113802456A (en) * | 2021-09-10 | 2021-12-17 | 中国十七冶集团有限公司 | Stay cable anticorrosion protective sleeve and operation method |
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