CN111021631B - Circular-section multi-layer sheet type CFRP inhaul cable system - Google Patents
Circular-section multi-layer sheet type CFRP inhaul cable system Download PDFInfo
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- CN111021631B CN111021631B CN201911366900.7A CN201911366900A CN111021631B CN 111021631 B CN111021631 B CN 111021631B CN 201911366900 A CN201911366900 A CN 201911366900A CN 111021631 B CN111021631 B CN 111021631B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
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- 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
- E04C5/085—Tensile members made of fiber reinforced plastics
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- 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
- E04C5/12—Anchoring devices
- E04C5/127—The tensile members being made of fiber reinforced plastics
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Abstract
The invention discloses a circular-section multi-layer sheet type CFRP inhaul cable system, and relates to the technical field of civil engineering and composite materials. The corrugated clamp comprises a CFRP sheet, sheet type foam, arc type foam, a polyethylene pipe sheath, an upper corrugated clamp plate, a lower corrugated clamp plate, a bolt, a nut and a gasket. The CFRP sheets with different widths are overlapped according to the rule that the width sizes of the upper layer and the lower layer are gradually reduced from the middle, the CFRP sheets with different widths are adopted at the free section of the stay cable, the outer edge vertexes of all the CFRP sheets and the sheet type foam are connected with a circle in an inscribed mode together to form a virtual circular section, and the outer part of the CFRP sheets is wrapped by a polyethylene pipe sheath; and a wave-shaped clamping piece is adopted to separate CFRP sheets in the anchoring section, and a wave-shaped clamping plate is used for clamping and anchoring. The invention overcomes the defect of difficult anchoring of the round-section bar-type CFRP stay cable, solves the problem of poor wind-induced vibration resistance of the rectangular-section sheet-type CFRP stay cable, and can be applied to cable-stayed bridges, suspension bridges and space cable structures.
Description
Technical Field
The invention relates to the fields of civil engineering, mechanical engineering, composite material technology and the like, in particular to a circular-section multilayer sheet type CFRP inhaul cable system.
Background
CFRP (Carbon Fiber Reinforced Polymer) is a new type of high performance composite material, consisting of Carbon fibers and a Polymer matrix that encapsulates the Carbon fibers. The CFRP has a plurality of excellent mechanical properties such as light weight, high strength, corrosion resistance, fatigue resistance, low creep, high damping and the like, and the inhaul cable made of the CFRP can overcome the defects of overlarge dead weight, insufficient strength, low bearing efficiency, poor durability and the like of the steel cable. The CFRP inhaul cable is used for replacing the steel cable in high-corrosivity environments such as large-span bridges, space structures, oceans and chemical plants and fatigue-prone environments with reciprocating loads, so that the total engineering investment is reduced, and the sustainable development of the society and national economy is promoted.
The cable is main atress component among cable-stay bridge, suspension bridge and the space cable structure, and two kinds of cable forms that have now include: round cross section rod type CFRP cable and rectangular cross section sheet type CFRP cable, however round cross section rod type CFRP cable has the difficult shortcoming of anchor, and rectangular cross section sheet type CFRP cable has the not good shortcoming of anti wind-induced vibration performance for the use of two kinds of cable systems all receives the restriction of different degree.
Disclosure of Invention
The invention aims to provide a circular-section multi-layer sheet type CFRP cable system mainly aiming at the problems in the background art. The invention can effectively solve the problems of difficult anchoring of the round-section bar-type CFRP guy cable and poor wind-induced vibration resistance of the rectangular-section sheet-type CFRP guy cable, and further improves the performance and the applicability of the CFRP guy cable.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a round cross-section multi-layer sheet type CFRP cable system comprising: CFRP sheet (1), sheet type foam (2), circular arc type foam (3), polyethylene pipe sheath (4), go up wave form splint (5), wave form splint (6) down, wave form clamping piece (7), bolt (8), nut (9), packing ring (10), its characterized in that: the CFRP sheets (1) with different widths are overlapped according to the rule that the width sizes of the upper layer and the lower layer are gradually reduced from the middle layer; in the free section of the stay cable, sheet type foams (2) with different widths are adopted to separate CFRP sheets (1), a layer of arc type foam (3) is attached to the top and the bottom of the free section respectively, the outer edge vertexes of all the CFRP sheets (1), the sheet type foams (2) and the arc type foams (3) are connected with a circle in an inscribed mode together, and a virtual circular section is formed in the free section of the stay cable (the schematic diagram of the circular section is shown in the attached figure 1); in the anchoring section of the inhaul cable, the CFRP sheets (1) with different widths are arranged at intervals of the waveform clamping pieces (7) with the same width, the CFRP sheets (1) on the uppermost layer and the lowermost layer are respectively in direct contact with the upper waveform clamping plate (5) and the lower waveform clamping plate (6), the bolt (8) penetrates through the upper waveform clamping plate (5), all the waveform clamping pieces (7) and the lower waveform clamping plate (6) but does not penetrate through any CFRP sheet (1), and the clamping and anchoring of the CFRP sheets (1) are realized by screwing the bolt (8) and the nut (9).
The round-section multilayer sheet type CFRP inhaul cable system is characterized in that: each layer of CFRP sheet (1) is equal in thickness, and each layer of sheet type foam (2) is equal in thickness and equal to the thickness of the CFRP sheet; the widths of the CFRP sheet (1) and the sheet type foam (2) are symmetrically changed according to the rule that the widths of the layers are gradually reduced from the middle layer to the upper layer and the lower layer, and the vertexes of the outer edges of the layers after the CFRP sheet (1) and the sheet type foam (2) are overlapped are connected with a circle in an inscribed mode to form a virtual circular section.
The inner diameter of the polyethylene pipe sheath (3) is represented as D, CFRP, the thickness of the sheet material (1) is represented as b, and since the outer edge vertexes of the layers after the CFRP sheet material (1) and the sheet material type foam (2) are overlapped together to inscribe a circle, namely the outer edge vertexes of the layers are on the same circle curve, if the center of the circle curve is the origin of coordinates, the circle curve equation is represented as:
and:
the thickness of each layer of CFRP sheet (1) is b, and the thickness of each layer of sheet type foam (2) is b;
the width of the middle layer of the CFRP sheet (1) is as follows:
the ith layer width up or down from the middle layer is:
(wherein i is 1,2, …, n);
③ the width of the ith layer from the middle layer upwards or downwards of the sheet type foam (2) is as follows:
fourthly, according to the width calculation formula of the ith layer of CFRP sheet material (1) from the middle layer to the upper or lower layer, when the layer by layer is calculated until the Nth layer of the sheet material meets wCNWhen the number of the CFRP sheets is less than 1/3D, the number of the CFRP sheets (1) can be determined as follows: 2N + 1; the number of layers of the sheet type foam (2) is as follows: 2N, and (3).
A layer of circular arc foam (3) is respectively attached to the top and the bottom of a CFRP sheet (1) and sheet type foam (2) laminated layer, so that the vertex of the outer edge of the whole laminated layer is tightly connected with the inner wall of a polyethylene pipe sheath (3). The arc foam has a cross section with a width of
The arc length is:
the adopted foam is shock-absorbing polyurethane foam, can absorb and dissipate energy in two modes of air damping and mechanical damping, and has good impact energy absorption and shock absorption performance.
The round-section multilayer sheet type CFRP cable system can be applied to suspension bridges and cable-stayed bridges and can also be applied to space cable structures.
Compared with the prior art, the invention has the following beneficial effects:
the stay cable adopts the CFRP sheet of different width at the free section to adopt the sheet type foam interval CFRP sheet of different width, form a virtual circular cross-section after the coincide, can effectively reduce the wind vibration effect, promote stay cable self damping, make the anti wind of stay cable causes vibration performance to be far higher than current rectangular cross section sheet type CFRP stay cable, promotes the suitability of sheet type CFRP stay cable in the strong wind strong vibration environment.
The inhaul cable adopts wave form splint and wave form clamping piece to anchor the CFRP sheet of different width at the anchor section, and anchor efficiency is far higher than the ground tackle of current anchor circular cross section bar type CFRP inhaul cable, can effectively reduce ground tackle size, saves the cost.
Drawings
Fig. 1 is a schematic view of the circular cross section.
Fig. 2 is a schematic circular cross-sectional view of example one.
Fig. 3 is a schematic circular cross-sectional view of example two.
Fig. 4 is a position arrangement diagram of CFRP sheets of different widths.
Fig. 5 is a diagram showing the positional arrangement of sheet-type foams of different widths. .
Fig. 6 shows an imaginary circular cross section formed by laminating CFRP sheet and sheet type foam, and the exterior of the cross section is wrapped with a polyethylene tube sheath.
Fig. 7 is a construction flow chart of the cable anchoring section.
FIG. 8 is a schematic structural diagram of the present invention, a round section multi-layer sheet type CFRP cable system.
In the figure: 1-CFRP sheet, 2-sheet type foam, 3-arc type foam, 4-polyethylene pipe sheath, 5-upper waveform clamping plate, 6-lower waveform clamping plate, 7-waveform clamping plate, 8-bolt, 9-nut and 10-gasket.
Detailed Description
The invention is further illustrated by the following examples and figures.
The invention provides a circular-section multi-layer sheet type CFRP cable system, which aims to effectively solve the problems that a circular-section bar type CFRP cable is difficult to anchor and a rectangular-section sheet type CFRP cable is poor in wind-induced vibration resistance, and further improves the performance and the applicability of the CFRP cable.
Example one
According to the method, the outer diameter of the polyethylene pipe sheath is 100mm (inner diameter 96mm, thickness 2mm) and the sheet thickness is 1.6 mm;
the thickness of each layer of CFRP sheet is 1.6mm, and the thickness of each layer of sheet type foam is 1.6 mm;
width of middle layer of CFRP sheet material
From the middle layer upwards or downwards
The 1 st layer width is:
the width of the 2 nd layer is:
calculating layer by layer to:
the 13 th layer width is:
the 14 th layer width is:
sheet type foam up or down from the middle layer
The 1 st layer width is:
the width of the 2 nd layer is:
calculating layer by layer to:
the 13 th layer width is:
the 14 th layer width is:
in light of the calculations given above, the first example determines the number of layers of CFRP sheet: 2 × 14+1 ═ 29 layers, as shown in fig. 4;
the number of layers of the sheet type foam is as follows: 2 × 14 ═ 28 layers, the cross-sectional width of the circular arc foam was 29.98mm, and the length of the circular arc was:
as shown in figure 5(ii) a A schematic view of a circular cross-section is shown in figure 2.
The specific implementation steps are as follows:
step 1: superposing the CFRP sheets (1) according to the rule that the width size of each layer is gradually reduced from the middle layer to the upper layer and the lower layer, adopting sheet type foams (2) with different widths to separate the CFRP sheets (1) at the free section of the stay cable, and attaching arc type foams (3) at the top and the bottom;
step 2: wrapping the outside of the overlapped free section of the stay cable with a polyethylene pipe sheath (4);
and step 3: the wrapped inhaul cable is spaced by adopting the waveform clamping pieces (7) at the anchoring section, and then the inhaul cable is placed between the upper waveform clamping plate (5) and the lower waveform clamping plate (6), so that the reserved bolt holes on the upper waveform clamping plate (5), each layer of waveform clamping pieces (7) and the lower waveform clamping plate (6) are in one-to-one correspondence in the vertical direction;
and 4, step 4: washers (10) are additionally arranged at bolt holes at the top of the upper corrugated clamp plate (5) and the bottom of the lower corrugated clamp plate (6), and bolts (7) sequentially penetrate through the upper corrugated clamp plate (5), the corrugated clamping pieces (7) and the lower corrugated clamp plate (6);
and 5: and tightening the bolt (8) and the nut (9) to tightly clamp the CFRP multilayer sheet (1).
Example two:
compared with the first example, the second example adopts the method to determine the circular section and the same implementation steps; the difference lies in that: the outer diameter of the polyethylene pipe sheath is 120mm (the inner diameter is 114mm, the thickness is 3mm), and the thickness of the sheet material is 1.8 mm;
the thickness of each layer of CFRP sheet is 1.8mm, and the thickness of each layer of sheet type foam is 1.8 mm;
width of middle layer of CFRP sheet material
From the middle layer upwards or downwards
The 1 st layer width is:
the width of the 2 nd layer is:
calculating layer by layer to:
the 14 th layer width is:
the 15 th layer width is:
sheet type foam up or down from the middle layer
The 1 st layer width is:
the width of the 2 nd layer is:
calculating layer by layer to:
the 14 th layer width is:
the 15 th layer width is:
in accordance with the calculations given above, example 2 can determine the number of layers of CFRP sheet as: 2 × 15+1 ═ 31 layers;
the number of layers of the sheet type foam is as follows: 2 × 15 ═ 30 layers. The width of the section of the arc foam is 30.66mm, and the length of the arc is as follows:
example two circular cross-sectional views are shown in figure 3.
Claims (5)
1. A round cross-section multi-layer sheet type CFRP cable system comprising: CFRP sheet (1), sheet type foam (2), circular arc type foam (3), polyethylene pipe sheath (4), go up wave form splint (5), wave form splint (6), wave form clamping piece (7), bolt (8), nut (9) and packing ring (10), its characterized in that down: the CFRP sheets (1) with different widths are overlapped according to the rule that the width sizes of the upper layer and the lower layer are gradually reduced from the middle layer; in the free section of the stay cable, sheet type foams (2) with different widths are adopted to separate CFRP sheets (1), the top and the bottom of the stay cable are respectively attached with a layer of arc type foam (3), the outer edge vertexes of all the CFRP sheets (1), the sheet type foams (2) and the arc type foams (3) are connected with a circle in an inscribed mode, and a virtual circular section is formed in the free section of the stay cable; in the anchoring section of the inhaul cable, the CFRP sheets (1) with different widths are arranged at intervals of the waveform clamping pieces (7) with the same width, the CFRP sheets (1) on the uppermost layer and the lowermost layer are respectively in direct contact with the upper waveform clamping plate (5) and the lower waveform clamping plate (6), the bolt (8) penetrates through the upper waveform clamping plate (5), all the waveform clamping pieces (7) and the lower waveform clamping plate (6) but does not penetrate through any CFRP sheet (1), and the clamping and anchoring of the CFRP sheets (1) are realized by screwing the bolt (8) and the nut (9).
2. A round section multi-layer sheet type CFRP cable system according to claim 1, characterized in that: each layer of CFRP sheet (1) is equal in thickness, and each layer of sheet type foam (2) is equal in thickness and equal to the thickness of the CFRP sheet; the widths of the CFRP sheet (1) and the sheet type foam (2) are symmetrically changed according to the rule that the widths of the layers are gradually reduced from the middle layer to the upper layer and the lower layer, and the vertexes of the outer edges of the layers after the CFRP sheet (1) and the sheet type foam (2) are overlapped are inscribed with a circle together to form a virtual circular section;
the inner diameter of the polyethylene pipe sheath (4) is represented as D, CFRP, the thickness of the sheet material (1) is represented as b, and since the outer edge vertexes of the layers after the CFRP sheet material (1) and the sheet material type foam (2) are overlapped together to inscribe a circle, namely the outer edge vertexes of the layers are on the same circle curve, if the center of the circle curve is the origin of coordinates, the circle curve equation is represented as:
and:
the thickness of each layer of CFRP sheet (1) is b, and the thickness of each layer of sheet type foam (2) is b;
the width of the middle layer of the CFRP sheet (1) is as follows:
the ith layer width up or down from the middle layer is:
wherein i is 1,2, …, n;
③ the width of the ith layer from the middle layer upwards or downwards of the sheet type foam (2) is as follows:
fourthly, according to the width calculation formula of the ith layer of CFRP sheet material (1) from the middle layer to the upper or lower layer, when the layer by layer is calculated until the Nth layer of the sheet material meets wCNWhen the number of the CFRP sheets is less than 1/3D, the number of the CFRP sheets (1) is determined as follows: 2N + 1; the number of layers of the sheet type foam (2) is as follows: 2N, and (3).
3. A round section multi-layer sheet type CFRP cable system according to claim 1, characterized in that: respectively attaching a layer of arc foam (3) to the top and the bottom of a superposed layer formed by the CFRP sheet (1) and the sheet type foam (2) so that the top of the outer edge of the whole superposed layer is tightly connected with the inner wall of the polyethylene pipe sheath (4); the arc foam has a cross section with a width of
The arc length is:
4. a round section multi-layer sheet type CFRP cable system according to claim 1, characterized in that: the adopted foam is shock-absorbing polyurethane foam, and can absorb and dissipate energy in two modes of air damping and mechanical damping.
5. A round section multi-layer sheet type CFRP cable system according to claim 1, characterized in that: the round section multi-layer sheet type CFRP cable system is realized by the following method,
step 1: superposing the CFRP sheets (1) according to the rule that the width size of each layer is gradually reduced from the middle layer to the upper layer and the lower layer, adopting sheet type foams (2) with different widths to separate the CFRP sheets (1) at the free section of the stay cable, and attaching arc type foams (3) at the top and the bottom;
step 2: wrapping the outside of the overlapped free section of the stay cable with a polyethylene pipe sheath (4);
and step 3: the wrapped inhaul cable is spaced by adopting the waveform clamping pieces (7) at the anchoring section, and then the inhaul cable is placed between the upper waveform clamping plate (5) and the lower waveform clamping plate (6), so that the reserved bolt holes on the upper waveform clamping plate (5), each layer of waveform clamping pieces (7) and the lower waveform clamping plate (6) are in one-to-one correspondence in the vertical direction;
and 4, step 4: washers (10) are additionally arranged at bolt holes at the top of the upper corrugated clamp plate (5) and the bottom of the lower corrugated clamp plate (6), and bolts (8) sequentially penetrate through the upper corrugated clamp plate (5), the corrugated clamping pieces (7) and the lower corrugated clamp plate (6);
and 5: and tightening the bolt (8) and the nut (9) to tightly clamp the CFRP multilayer sheet (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911366900.7A CN111021631B (en) | 2019-12-26 | 2019-12-26 | Circular-section multi-layer sheet type CFRP inhaul cable system |
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| CN201911366900.7A CN111021631B (en) | 2019-12-26 | 2019-12-26 | Circular-section multi-layer sheet type CFRP inhaul cable system |
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| CN111021631A CN111021631A (en) | 2020-04-17 |
| CN111021631B true CN111021631B (en) | 2021-08-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113585629A (en) * | 2021-07-20 | 2021-11-02 | 重庆达力索缆科技有限公司 | Carbon fiber inhaul cable and inhaul cable system |
| CN113585628A (en) * | 2021-07-20 | 2021-11-02 | 重庆达力索缆科技有限公司 | Carbon fiber inhaul cable capable of being used for large building structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1208456A (en) * | 1967-10-05 | 1970-10-14 | Holzmann Philipp Ag | Improvements in or relating to the anchoring of bracing wires |
| CN2068534U (en) * | 1990-03-23 | 1991-01-02 | 湖南省公路桥梁建设公司六公司 | Multi-layer protection wire rope |
| CN2818624Y (en) * | 2005-05-31 | 2006-09-20 | 南京工业大学 | Clamping piece anchoring body device of FRP plate |
| CN102587585A (en) * | 2012-02-10 | 2012-07-18 | 全恩懋 | Flat turn regulation pre-tightening type directional clamping anchor |
| CN109881842A (en) * | 2019-03-08 | 2019-06-14 | 北京工业大学 | A kind of FRP sheet material change chucking power wave-shaped splint anchor |
-
2019
- 2019-12-26 CN CN201911366900.7A patent/CN111021631B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1208456A (en) * | 1967-10-05 | 1970-10-14 | Holzmann Philipp Ag | Improvements in or relating to the anchoring of bracing wires |
| CN2068534U (en) * | 1990-03-23 | 1991-01-02 | 湖南省公路桥梁建设公司六公司 | Multi-layer protection wire rope |
| CN2818624Y (en) * | 2005-05-31 | 2006-09-20 | 南京工业大学 | Clamping piece anchoring body device of FRP plate |
| CN102587585A (en) * | 2012-02-10 | 2012-07-18 | 全恩懋 | Flat turn regulation pre-tightening type directional clamping anchor |
| CN109881842A (en) * | 2019-03-08 | 2019-06-14 | 北京工业大学 | A kind of FRP sheet material change chucking power wave-shaped splint anchor |
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