CN113802455A - Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof - Google Patents
Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof Download PDFInfo
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- CN113802455A CN113802455A CN202111010491.4A CN202111010491A CN113802455A CN 113802455 A CN113802455 A CN 113802455A CN 202111010491 A CN202111010491 A CN 202111010491A CN 113802455 A CN113802455 A CN 113802455A
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- 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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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
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Abstract
An anchorage device for a carbon fiber parallel inhaul cable and an anchoring method thereof. The invention belongs to the field of engineering material CFRP application. The invention aims to solve the technical problem that the anchoring efficiency is low because a rod body is damaged due to uneven stress distribution of an anchoring area of the conventional CFRP inhaul cable anchoring system. The anchorage device of the carbon fiber reinforced composite material inhaul cable comprises an anchor cup, a front end wire splitting plate, a rear end wire splitting plate and a sealing bolt, wherein the sealing bolt is in threaded connection with the inner diameter of the tail end of the anchor cup, the anchor cup is of an integrated structure consisting of a front end straight section, a middle straight conical section and a rear end triangular groove section, the inner cavity of the front end straight section is cylindrical, the inner cavity of the middle straight conical section is in a circular truncated cone shape, and the inner cavity of the rear end triangular groove section is in a tower-shaped circular truncated cone shape. The anchor device adopts the mutual matching of the straight conical section and the triangular groove section, reduces the stress concentration at the front part, increases the anchoring effect at the rear part of the anchoring area, can improve the anchoring efficiency, and reduces the probability of rod body damage, thereby achieving higher bearing capacity.
Description
Technical Field
The invention belongs to the field of anchoring of carbon fiber reinforced composite materials, and particularly relates to an anchorage device for a carbon fiber parallel inhaul cable and an anchoring method thereof.
Background
Since the new century, the durability problem of bridges caused by corrosion of steel materials is becoming more serious, and the corrosion of steel bars or steel materials has become a leading cause of the influence on the durability of concrete structures. The total cost of corrosion in China in 2014 exceeds 2 trillion yuan, which accounts for about 3.34% of the total value of domestic production in the current year, wherein the corrosion loss related to bridge engineering accounts for a considerable proportion. The durability and safety of the infrastructure such as bridges in the harsh environments of the ocean and the middle and western parts are particularly outstanding. Therefore, the corrosion problem of the steel bars or steel materials in bridge engineering is solved, the durability of the structure is improved, and the service life of the structure is prolonged, so that the bridge has great significance.
Relevant scientific research and engineering practice at home and abroad show that the carbon fiber reinforced composite material is a novel high-performance material and has very wide application prospect in bridge engineering. The carbon fiber material is formed by mixing carbon fiber and a matrix according to a certain proportion and compounding the mixture through a pultrusion process, and has the excellent characteristics of light weight, high strength, corrosion resistance, fatigue resistance and the like. The carbon fiber rod can replace common steel bars, prestressed steel bars or steel cables to be used for building a bridge;
if the high strength performance of the carbon fiber reinforced composite material rod is to be fully exerted, a reliable and efficient anchoring system is needed for anchoring, the traditional steel strand mostly uses clamping pieces or extrusion anchoring, the steel strand has high compressive strength and is isotropic, so the clamping piece anchor or the extrusion anchoring can be used for the steel strand, but the carbon fiber rod is anisotropic and has poor transverse performance, the traditional anchoring method can cause great damage to the carbon fiber rod body, so the rod body loses bearing capacity in advance, and therefore, the bonding type anchoring is mostly used for anchoring the carbon fiber inhaul cable.
In a bonding type anchoring system, an inner conical anchoring form is a main form, but the defect of the inner conical anchoring form is obvious, the inner conical anchoring system is often at a load end, namely a cone mouth is subjected to stress concentration to cause the rod body to be damaged, so that the anchoring efficiency is low, and when the fatigue load is borne, the fatigue damage is easy to occur, the excellent fatigue performance of the carbon fiber rod body cannot be fully exerted, secondly, the stress of the inner conical anchoring system is mostly concentrated at the front part, and the rear part of an anchoring area plays a very small role, so that the front part has higher stress level and is unreasonable in stress, and some anchoring modes achieve the purpose of reducing the stress concentration by replacing filling materials with different rigidities.
Disclosure of Invention
The invention provides an anchorage device for a carbon fiber parallel cable and an anchoring method thereof, aiming at solving the technical problem of low anchoring efficiency caused by damage of a rod body due to uneven stress distribution of an anchoring area of the existing CFRP cable anchoring system.
The anchorage device for the carbon fiber parallel inhaul cable comprises an anchor cup, a front end wire splitting plate, a rear end wire splitting plate and a sealing bolt, wherein the sealing bolt is in threaded connection with the inner diameter of the tail end of the anchor cup, the anchor cup is of an integrated structure consisting of a front end straight section, a middle straight conical section and a rear end triangular groove section, the inner cavity of the front end straight section is cylindrical, the inner cavity of the middle straight conical section is in a circular truncated cone shape, and the inner cavity of the rear end triangular groove section is in a tower-shaped circular truncated cone shape.
Further limiting, one end of the rear-end wire separating plate is provided with an exhaust hole communicated with the inner cavity of the anchor cup.
Further limiting, the included angle between each layer of truncated cone generatrix of the tower-shaped truncated cone-shaped inner cavity of the rear end triangular groove section and the axis is alpha from the tower top to the tower bottom in sequence1、α2、α3...αn-1、αnWherein n is a positive integer, and each angle satisfies alphan-1≤αn。
Further limiting, the included angle beta between the generatrix of the truncated cone-shaped inner cavity of the middle straight cone section and the axis satisfies that beta is less than alpha1。
Further limiting, the included angle alpha between each layer of truncated cone generatrix of the rear end triangular groove section tower-shaped truncated cone-shaped inner cavity and the axisnThe load change of the anchor device is carried out correspondingly.
Further limiting, the front end wire separating plate and the rear end wire separating plate are respectively clamped at the front end and the rear end of the anchor cup.
Further limiting, the number and the diameter of the holes on the front end wire separating plate and the rear end wire separating plate are the same.
The anchoring method for the carbon fiber parallel inhaul cable is carried out according to the following steps:
step 1: fixing the anchor cup on a workbench, sequentially penetrating carbon fiber rods into holes in the front end wire splitting plate and the rear end wire splitting plate, and clamping the rear end wire splitting plate at the rear end of the anchor cup to form a carbon fiber inhaul cable;
step 2: hoisting the anchor cup, pouring epoxy iron sand from the front end of the anchor cup, clamping the front end wire separating plate at the front end port of the anchor cup after pouring, discharging air from the exhaust hole on the rear end wire separating plate through continuous vibration, filling the epoxy iron sand in the anchor cup tightly, screwing the sealing bolt, heating and curing, and finishing anchoring.
Further limiting, in the step 2, the epoxy iron sand is a mixture of epoxy resin and iron sand.
Further limiting, the temperature of the heating and curing in the step 2 is 80-150 ℃, and the time is 6-24 h.
Compared with the prior art, the invention has the following remarkable effects:
1) according to the anchor device, the straight conical section and the triangular groove section are matched with each other, so that the stress concentration at the front part is reduced, the anchoring effect at the rear part of the anchoring area is improved, the anchoring efficiency can be improved, the probability of rod body damage is reduced, and the larger bearing capacity is achieved;
2) the anchor can dynamically adjust the lengths and angles of the straight conical section and the triangular groove section according to the number of the anchor inhaul cable rod bodies, and the angles of the straight conical section and the triangular groove section can be properly amplified when the inhaul cable is designed to have larger load;
3) the angle of each section in the triangular groove section in the anchorage device can be changed according to the load of the inhaul cable and the anchoring length, so that the carbon fiber inhaul cable can be suitable for carbon fiber inhaul cables with different tonnages.
4) The anchor device can reduce the slippage of the whole cable body and the filling material due to the existence of the triangular groove section, thereby reducing the radial deformation of the epoxy iron sand and reducing the compressive stress of the rod body;
5) according to the anchor device, the front and rear filament separating plates are used, the carbon fiber cable body is dispersed in the anchoring area and is triangular, the contact area of the carbon fiber rod and the epoxy iron sand is increased, the shearing stress of the rod body along the surface is more uniform, the stressed compressive stress is more uniform, the stress concentration is reduced, and the anchoring efficiency is improved.
Drawings
FIG. 1 is a schematic view of an anchor according to the present invention;
FIG. 2 is a schematic view showing the angles of the straight cone section and the triangular groove section in the anchor according to the present invention;
wherein, 1-anchor cup, 101-front end straight section, 102-middle straight taper section, 103-rear end triangular groove section, 2-front end wire separating plate, 3-rear end wire separating plate, 4-sealing bolt, and 5-exhaust hole.
Detailed Description
Embodiment 1, the ground tackle for carbon fiber parallel cable of this embodiment includes anchor cup 1, front end branch silk board 2, rear end branch silk board 3, sealing bolt 4 and anchor cup 1 tail end internal diameter threaded connection, anchor cup 1 is the integrative structure that comprises front end straight section 101, middle straight taper section 102 and rear end triangular groove section 103, the inner chamber of front end straight section 101 is cylindrically, the inner chamber of middle straight taper section 102 is the round platform shape, the inner chamber of rear end triangular groove section 103 is the tower form round platform shape, one end of rear end branch silk board 3 is equipped with the exhaust hole 5 with anchor cup 1 inner chamber intercommunication, each layer round platform generating line of the tower form round platform shape inner chamber of rear end triangular groove section 103 is alpha round platform shape with the contained angle of axis in proper order from the top of the tower to the bottom of the tower1、α2、α3...αn-1、αnWherein n is a positive integer, and each angle satisfies alphan-1≤αnSaid intermediate straight conical section 102The included angle beta between the generatrix of the truncated cone-shaped inner cavity and the axis satisfies that beta is less than alpha1The included angle alpha between each layer of truncated cone generatrix of the tower-shaped truncated cone-shaped inner cavity of the rear-end triangular groove section 103 and the axisnThe front end wire separating plate 2 and the rear end wire separating plate 3 are respectively clamped at the front end and the rear end of the anchor cup 1, and the number and the diameter of holes in the front end wire separating plate 2 and the rear end wire separating plate 3 are the same.
Example 2, the method for anchoring the carbon fiber parallel cable by using the anchor of example 1 was performed according to the following steps:
step 1: fixing the anchor cup 1 on a workbench, sequentially penetrating the carbon fiber rods 6 into holes in the front end wire splitting plate 2 and the rear end wire splitting plate 3, and then clamping the rear end wire splitting plate 3 at the rear end of the anchor cup 1 to form a carbon fiber inhaul cable;
step 2: the anchor cup 1 is lifted up, the epoxy iron sand 7 is poured from the front end of the anchor cup 1 and is vertical to the ground, the epoxy iron sand 7 is a mixture of epoxy resin and iron sand, the front end wire separating plate 2 is clamped at the front end port of the anchor cup 1 after pouring is completed, air is discharged from the exhaust hole 5 on the rear end wire separating plate 3 through continuous vibration, the epoxy iron sand 7 is tightly filled in the anchor cup 1, then the sealing bolt 4 is screwed up, heating and curing are carried out, anchoring is completed, and the other end of the carbon fiber rod is anchored in the same mode.
Claims (10)
1. The utility model provides an anchorage device for carbon fiber parallel cable, its characterized in that, this anchorage device include anchor cup (1), front end branch silk board (2), rear end branch silk board (3), sealing bolt (4) and anchor cup (1) tail end internal diameter threaded connection, anchor cup (1) is the integrative structure that comprises front end straight section (101), middle straight conic section (102) and rear end triangular groove section (103), the inner chamber of front end straight section (101) is cylindrically, the inner chamber of middle straight conic section (102) is the round platform shape, the inner chamber of rear end triangular groove section (103) is the tower form round platform shape.
2. An anchorage device for a carbon fiber parallel cable according to claim 1, wherein one end of the rear end wire-separating plate (3) is provided with an exhaust hole (5) communicated with an inner cavity of the anchorage cup (1).
3. The anchorage device for the carbon fiber parallel inhaul cable as claimed in claim 1, wherein included angles between generatrices of each layer of truncated cone of the tower-shaped truncated cone-shaped inner cavity of the rear-end triangular groove section (103) and an axis are alpha from the top to the bottom in sequence1、α2、α3...αn-1、αnWherein n is a positive integer, and each angle satisfies alphan-1≤αn。
4. The anchorage device for the carbon fiber parallel stay cable as claimed in claim 1, wherein the included angle β between the truncated cone generatrix of the truncated cone-shaped inner cavity of the middle straight conical section (102) and the axis satisfies β < α1。
5. The anchorage device for the carbon fiber parallel stay cable as claimed in claim 1, wherein the included angle α between each layer of truncated cone generatrix of the tower-shaped truncated cone-shaped inner cavity of the rear end triangular groove section (103) and the axis isnThe load change of the anchor device is carried out correspondingly.
6. The anchorage device for the carbon fiber parallel stay cable as claimed in claim 1, wherein the front end wire splitting plate (2) and the rear end wire splitting plate (3) are respectively clamped at the front end and the rear end of the anchor cup (1).
7. An anchorage device for a carbon fiber parallel cable according to claim 1, wherein the number and the diameter of the holes on the front end wire splitting plate (2) and the rear end wire splitting plate (3) are the same.
8. A method of anchoring a carbon fibre parallel cable using an anchor according to any of claims 1 to 7, characterised in that the method comprises the steps of:
step 1: fixing the anchor cup (1) on a workbench, sequentially penetrating carbon fiber rods (6) into holes in the front end wire splitting plate (2) and the rear end wire splitting plate (3), and clamping the rear end wire splitting plate (3) at the rear end of the anchor cup (1) to form a carbon fiber inhaul cable;
step 2: hoisting anchor cup (1), perpendicular to ground, pour epoxy iron sand (7) from anchor cup (1) front end, divide silk board (2) card to establish the front end port department at anchor cup (1) with the front end after pouring into the completion, divide exhaust hole (5) on silk board (3) with the air from the rear end through continuous vibration and discharge, it is closely knit to make epoxy iron sand (7) pack in anchor cup (1), later screw up sealing bolt (4), add thermosetting, accomplish the anchor.
9. The method for anchoring the carbon fiber parallel cable according to claim 8, wherein the epoxy iron sand (7) in the step 2 is a mixture of epoxy resin and iron sand.
10. The anchoring method of the carbon fiber parallel cable according to claim 8, wherein the temperature of the heating and curing in the step 2 is 80-150 ℃ and the curing time is 6-24 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111010491.4A CN113802455B (en) | 2021-08-31 | 2021-08-31 | Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof |
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| CN202111010491.4A CN113802455B (en) | 2021-08-31 | 2021-08-31 | Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof |
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| CN113802455A true CN113802455A (en) | 2021-12-17 |
| CN113802455B CN113802455B (en) | 2022-06-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351945A (en) * | 2022-01-06 | 2022-04-15 | 中国建筑第八工程局有限公司 | Anchoring system and method for carbon fiber tendon |
| CN114428015A (en) * | 2022-01-06 | 2022-05-03 | 中国建筑第八工程局有限公司 | Device and method for testing prestress loss of carbon fiber reinforced composite material rib |
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| CN105970956A (en) * | 2016-07-06 | 2016-09-28 | 中国京冶工程技术有限公司 | Clamping piece type anchorage device for FRP rebar and method for conducting anchoring through clamping piece type anchorage device |
| CN112411374A (en) * | 2020-10-10 | 2021-02-26 | 江苏法尔胜缆索有限公司 | Manufacturing and construction method of carbon fiber inhaul cable |
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2021
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| DE2700378A1 (en) * | 1976-02-09 | 1977-08-11 | Bureau Bbr Ltd | ANCHORING A WIRE BUNDLE IN AN ANCHOR HEAD |
| CN2821009Y (en) * | 2005-08-04 | 2006-09-27 | 柳州欧维姆机械股份有限公司 | Round tower shape anchor pad plate |
| CN102535342A (en) * | 2012-01-12 | 2012-07-04 | 江苏法尔胜缆索有限公司 | Cable-end sealing method for suspension cable of suspension bridge |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351945A (en) * | 2022-01-06 | 2022-04-15 | 中国建筑第八工程局有限公司 | Anchoring system and method for carbon fiber tendon |
| CN114428015A (en) * | 2022-01-06 | 2022-05-03 | 中国建筑第八工程局有限公司 | Device and method for testing prestress loss of carbon fiber reinforced composite material rib |
| CN114351945B (en) * | 2022-01-06 | 2023-08-08 | 中国建筑第八工程局有限公司 | Anchoring system and method for carbon fiber tendons |
| CN114428015B (en) * | 2022-01-06 | 2024-02-06 | 中国建筑第八工程局有限公司 | Device and method for testing prestress loss of carbon fiber reinforced composite bar |
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