CN116104016A - Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof - Google Patents

Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof Download PDF

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Publication number
CN116104016A
CN116104016A CN202310148980.9A CN202310148980A CN116104016A CN 116104016 A CN116104016 A CN 116104016A CN 202310148980 A CN202310148980 A CN 202310148980A CN 116104016 A CN116104016 A CN 116104016A
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China
Prior art keywords
sleeve
reinforced composite
inner cavity
cavity
fiber reinforced
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姜文韬
冯博
李红明
谢丹
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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Priority to CN202310148980.9A priority Critical patent/CN116104016A/en
Publication of CN116104016A publication Critical patent/CN116104016A/en
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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
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Bridges Or Land Bridges (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention discloses an anchor for ensuring long-term anchoring of a fiber reinforced composite inhaul cable in a large-span bridge and a method thereof. The anchorage comprises a steel sleeve, and the fiber reinforced composite material inhaul cable is arranged along the axis of the steel sleeve; the inner cavity of the steel sleeve is sequentially arranged into two sections along the axis between the free end and the loading end of the steel sleeve, and the two sections are corresponding to the inner cavity of the first sleeve and the inner cavity of the second sleeve; the cavity walls of the first sleeve inner cavity and the second sleeve inner cavity are tapered conical from the free end to the loading end, and a segmented step exists between the first sleeve inner cavity and the second sleeve inner cavity; the first sleeve cavity anchors the fiber reinforced composite cable by incorporating a clip friction anchor assembly, and the second sleeve cavity anchors the fiber reinforced composite cable by bonding the friction anchor structure. The invention adopts a mode of combining two different anchoring modes, greatly relieves the stress concentration at the port, ensures that the integral radial stress is more gentle, and is more suitable for a large-span bridge.

Description

Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof
Technical Field
The invention relates to a cable body anchoring technology in the field of civil engineering traffic, which is mainly used in the technical field of fiber reinforced composite material cable anchoring.
Background
The steel stranded wires are used for most of the ultra-large span bridges built up to date. In the future, the demand of people for bridges with spans exceeding kilometers will further increase, and the traditional steel inhaul cable is more and more inadaptable along with the increase of bridge spans. The fiber reinforced composite material inhaul cable has very high specific strength and rigidity, excellent equivalent modulus and excellent fatigue performance, and compared with the steel inhaul cable, the fiber reinforced composite material inhaul cable has more outstanding applicability in bridge structure application, and the prospect of the fiber reinforced composite material inhaul cable applied to a large-span bridge is not limited. As the anisotropic material, the transverse mechanical property of the fiber reinforced composite material cable is far smaller than that of the longitudinal direction, so that the anchorage device of the traditional anchorage steel cable is not suitable for the fiber reinforced composite material cable. Otherwise, the cable is damaged or extruded and destroyed in the anchoring area, and the longitudinal tensile strength of the cable is affected. Therefore, how to ensure that the fiber reinforced composite material guy cable anchoring system anchors the long-span bridge for a long time becomes a problem to be solved urgently.
At present, the common fiber reinforced composite material guy cable anchorage forms mainly comprise: adhesive type anchor, adhesive friction type anchor and friction type anchor. The adhesive type anchor device does not damage the fiber reinforced composite material inhaul cable body, but in view of the fact that the anchor device needs to be anchored by shear strength provided by a load adhesive medium between the adhesive type anchor device and the fiber reinforced composite material inhaul cable body, creep performance of the load transfer medium can influence long-term anchoring effect of the fiber reinforced composite material inhaul cable. Although the friction type anchorage device is convenient to use, the common problem is that stress concentration phenomenon occurs at the loading end, so that the fiber reinforced composite material inhaul cable is subjected to transverse shearing damage before tensile damage, and long-term anchorage is not facilitated. The anchor device used for anchoring the fiber reinforced composite material inhaul cable is a bonding friction type anchor device at home and abroad, the anchoring force of the inhaul cable is different from that of the bonding type anchor device, and the friction force is also involved in anchoring while the bonding force is provided. Although the fiber reinforced composite inhaul cable can be reliably anchored, and the long-span bridge can be anchored for a long time, the long-span bridge has the problem that the long-span bridge is disadvantageous to economic performance such as construction and installation due to the large span.
Therefore, under the condition of comprehensively analyzing the advantages and disadvantages of the existing anchorage devices, how to develop a method for ensuring long-term anchorage of the fiber reinforced composite inhaul cable in the large-span bridge becomes a problem to be solved if the FRP is further suitable for the future large-span bridge.
Disclosure of Invention
Technical problem
Aiming at the defects and shortcomings of the existing fiber reinforced composite material inhaul cable anchorage, the invention aims to provide an anchoring system which is reasonable in stress and can be used for a long time and efficiently for a long time, and can ensure the safety of inhaul cables under the long-term load effect, wherein the anchoring system is suitable for a large-span bridge (cable force 500-1000T).
The technical scheme is as follows:
an anchorage device for ensuring long-term anchorage of a fiber-reinforced composite material inhaul cable in a large-span bridge comprises a steel sleeve, wherein the fiber-reinforced composite material inhaul cable is arranged along the axis of the steel sleeve, one end of the steel sleeve is a loading end, and the other end of the steel sleeve is a free end; the inner cavity of the steel sleeve is sequentially arranged into two sections along the axis between the free end and the loading end, and the two sections are corresponding to the inner cavity of the first sleeve and the inner cavity of the second sleeve; the cavity walls of the first sleeve cavity and the second sleeve cavity are tapered from the free end to the loading end, the inner diameter of the narrow end of the first sleeve cavity is smaller than the inner diameter of the wide end of the second sleeve cavity, so that a segmented step is formed between the first sleeve cavity and the second sleeve cavity, and the axial length of the first sleeve cavity is smaller than that of the second sleeve cavity;
the first sleeve cavity anchors the fiber reinforced composite cable by incorporating a clip friction anchor assembly, and the second sleeve cavity anchors the fiber reinforced composite cable by bonding the friction anchor structure.
Preferably, the axial length ratio of the inner cavities of the first sleeve and the second sleeve is L1:L2 less than or equal to 3:7.
Preferably, the clamping piece friction type anchoring component is formed by encircling three or four steel clamping pieces, and is a conical assembly component with a middle through hole on the whole; the outer wall shape of the conical assembly member is matched with the cavity wall shape of the inner cavity of the first sleeve, and the middle through hole of the conical assembly member can be used for coating the fiber reinforced composite inhaul cable.
Preferably, the bonded friction type anchoring structure is formed by curing a loaded bonding medium poured into the inner cavity of the second sleeve, and the bonded friction type anchoring structure is a conical curing member with a middle through hole as a whole; the shape of the outer wall of the conical curing member is matched with the shape of the cavity wall of the inner cavity of the second sleeve, and the middle through hole of the conical curing member can be used for coating the fiber reinforced composite inhaul cable;
the load bonding medium is prepared from resin and quartz sand according to the following ratio of 1:0.2 to 1:1, and the rigidity range of the load bonding medium is 2GPa to 10GPa.
Preferably, the taper alpha of the cavity wall of the first sleeve inner cavity is 2-4 degrees.
Preferably, the taper beta of the wall of the second sleeve inner cavity is 3-5 degrees.
Preferably, the material of the fiber reinforced composite guy cable comprises carbon fiber, basalt fiber, glass fiber or aramid fiber.
Preferably, the axial length ratio of the first sleeve inner cavity to the second sleeve inner cavity is 1:4.
Preferably, the cavity wall of the inner cavity of the second sleeve is provided with a pouring hole and an overflow hole in a penetrating way.
The invention also provides a method for ensuring long-term anchoring of the fiber-reinforced composite cable in the large-span bridge, which adopts the anchorage device for ensuring long-term anchoring of the fiber-reinforced composite cable in the large-span bridge to anchor the fiber-reinforced composite cable in the large-span bridge, and comprises the following steps:
step one, optimizing the shape of the inner wall of a steel sleeve
The method comprises the steps that an inner cavity of a steel sleeve is arranged into two sections along an axis between a loading end and a free end, the two sections are respectively corresponding to a first sleeve inner cavity and a second sleeve inner cavity, the cavity walls of the first sleeve inner cavity and the second sleeve inner cavity are respectively arranged into conical shapes which taper from the free end to the loading end, the inner diameter of a narrow end of the first sleeve inner cavity is smaller than the inner diameter of a wide end of the second sleeve inner cavity, so that a segmentation step is formed between the first sleeve inner cavity and the second sleeve inner cavity, and meanwhile, the axial length of the first sleeve inner cavity is smaller than that of the second sleeve inner cavity; wherein the first sleeve lumen is disposed proximate the free end and the second sleeve lumen is disposed proximate the loading end;
two holes are formed in the steel sleeve close to the loading end, wherein one hole is a pouring hole, and the other hole is an overflow hole;
step two, enabling the fiber reinforced composite material inhaul cable to pass through the steel sleeve, and tensioning the fiber reinforced composite material inhaul cable;
thirdly, sequentially jacking each steel clamping piece into the steel sleeve;
step four, loosening the fiber reinforced composite material inhaul cable, retracting the fiber reinforced composite material inhaul cable, generating radial extrusion pressure on the fiber reinforced composite material inhaul cable by the steel clamping piece, and anchoring the fiber reinforced composite material inhaul cable by forming self-locking by virtue of friction force between the steel clamping piece and the fiber reinforced composite material inhaul cable, so that the steel sleeve and the fiber reinforced composite material inhaul cable are relatively fixed;
pouring the load bonding medium into the steel sleeve from the pouring hole until the load bonding medium overflows from the overflow hole, stopping pouring, and solidifying to form the bonding friction type anchoring structure; the load bonding medium is composed of epoxy resin quartz sand, and the mass ratio of the resin to the quartz sand is 1:0.2-1:1.
compared with the prior art, the invention has the following characteristics:
1. the method for ensuring long-term anchoring of the fiber reinforced composite inhaul cable in the large-span bridge maintains the characteristic of convenient use, solves the problem of stress concentration at the common loading end, avoids transverse shearing damage of the fiber reinforced composite inhaul cable before tensile damage, and ensures long-term anchoring. The advantages of the conventional bonding friction type anchor device are combined, namely that the cable force is balanced by the bonding force in the initial stage of anchoring, and the anchoring force is provided by the friction force in the latter half stage of anchoring. The invention is suitable for the prestress fiber reinforced composite material inhaul cable in engineering application, and the size of the anchorage device is obviously reduced.
3. The invention discloses a method for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge, which is developed by the invention, wherein a resin-based bonding steel sleeve with smaller rigidity and the fiber reinforced composite cable are utilized at the front end of an anchor. The resin with smaller rigidity and quartz sand are used as load bonding medium, so that damage to the rib materials can be greatly reduced. The anchor loading end adopts bonding friction type to relieve the phenomenon of stress concentration, and radial stress can be transferred from the loading end to the free end. The rear half part of the anchorage device adopts a self-locking clamping piece for bearing the transmitted radial stress.
4. The invention combines two different anchoring modes, greatly relieves the stress concentration at the port and avoids the radial damage of the inhaul cable. The integral radial stress is more gentle, the degree of great creep deformation of the resin caused by unbalanced radial stress is solved, and the stability of the fiber reinforced composite material inhaul cable under long-term load is further improved.
Drawings
Fig. 1 is a schematic diagram of an anchor structure for ensuring long-term anchoring of fiber reinforced composite cables in a large span bridge.
Fig. 2 is a partial cross-sectional view of fig. 1 taken along line A-A.
Fig. 3 is a schematic view of the three-piece clip arrangement of fig. 1 along line A-A.
Fig. 4 is a schematic view of the four-piece clip arrangement of fig. 1 along line A-A.
Fig. 5 is a schematic view of an anchor system infusion process.
FIG. 6 is a graph showing the radial stress distribution of the cable at the anchoring zone for different steel clips and length comparisons of the loaded bonding medium.
FIG. 7 is a graph showing the radial stress distribution of the pretension to the cable in the anchoring zone.
1, a fiber reinforced composite material inhaul cable; 2. loading a bonding medium; 3. a steel clip; 4. a steel sleeve; 5. pouring the holes; 6. and (3) pouring the catheter.
Description of the embodiments
The technical solution of the present invention will be further explained in detail below with reference to the attached drawings, it being understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention, and that modifications of the present invention in various equivalent forms will fall within the scope of the appended claims of the present application after reading the present invention.
Referring to fig. 1 and 2, the anchorage device for guaranteeing long-term anchorage of a fiber reinforced composite cable in a large-span bridge according to the invention comprises a steel sleeve 4 and a steel clamping piece 3.
The steel sleeve 4 has a special configuration, specifically, the inner cavity of the steel sleeve 4 is sequentially arranged into two sections along the axis between the free end and the loading end of the steel sleeve, and the two sections are correspondingly a first sleeve inner cavity and a second sleeve inner cavity, namely the first sleeve inner cavity is arranged near the free end of the steel sleeve 4, and the second sleeve inner cavity is arranged near the loading end of the steel sleeve 4; the cavity walls of the first sleeve cavity and the second sleeve cavity are tapered from the free end to the loading end, and the inner diameter of the narrow end of the first sleeve cavity is smaller than that of the wide end of the second sleeve cavity, so that a segmented step is formed between the first sleeve cavity and the second sleeve cavity, and meanwhile, the axial length of the first sleeve cavity is smaller than that of the second sleeve cavity.
During anchoring, the inhaul cable (namely the fiber reinforced composite inhaul cable 1) formed by the fiber reinforced composite material passes through the steel sleeve 4, and the fiber reinforced composite material inhaul cable is clamped at the free end through the steel clamping piece 3. The steel clamping piece 3 and the fiber reinforced composite material inhaul cable have a large enough friction coefficient, so that a large enough friction force exists between the steel clamping piece 3 and the fiber reinforced composite material inhaul cable; the friction coefficient between the steel clamping piece 3 and the steel sleeve 4 is reduced as much as possible, so that synchronous follow-up in the clamping piece tensioning process is ensured. During installation, the steel clamping piece 3 is jacked into the steel sleeve 4, the fiber reinforced composite material inhaul cable 1 is retracted after being tensioned, the steel clamping piece 3 generates radial extrusion pressure on the fiber reinforced composite material inhaul cable 1, and self-locking is formed by virtue of friction force between the steel clamping piece 3 and the fiber reinforced composite material inhaul cable to anchor the prestress inhaul cable.
The anchorage after clamping of the steel clip 3 will at the loading end cause the fibre reinforced composite cable 1 and the steel sleeve 4 to remain relatively fixed.
Next, the construction of the bonded friction type anchoring structure is started: as shown in fig. 5, the load binding medium 2 is poured horizontally into the steel sleeve through a hollow pouring conduit 6. Two holes 6 are arranged on the steel sleeve 4, one of which is a pouring hole, and the other is an overflow hole. The filling holes are used for filling the load binding medium 2, and the overflow holes are used for observing whether the load binding medium 2 fills the second sleeve inner cavity of the steel sleeve 4. Thus, the pouring can be stopped when the overflow holes are overflowed with the loaded binding medium 2. And after the cable anchoring system is completely cured, the cable anchoring system can be integrally installed and protected. The load bonding medium 2 is composed of epoxy resin quartz sand (compressive strength is 90-100 MPa), and resin: quartz sand = 1:0.2 to 1:1, the rigidity of the load bonding medium 2 ranges from 2GPa to 10GPa. The steel clip 3 and the steel sleeve 4 are made of high-strength steel Q690.
The optimal design parameters of the anchoring system of the invention are based on finite element optimization. The length ratio of the clamping piece to the load bonding medium is 1:4 is the best design, see fig. 6. When the ratio is too low, the length of the clamping piece end occupies a small total length, and the radial stress transmitted by the loaded bonding medium is too much, so that the radial stress born by the clamping piece is larger; when the load bonding medium is too long, namely the ratio is too high, the radial stress of the loading end is high even if the radial stress is relieved. Therefore, the proper proportion can well transfer radial stress to the clamping piece stage, and the overall radial stress can be more uniform, so that the creep deformation of the resin is reduced, and the service life of the fiber reinforced composite material inhaul cable is prolonged. Referring to fig. 7, the influence of the pretightening force on the radial stress is not great when the clamping piece is clamped, so that the clamping piece has good self-anchoring performance and self-locking capability, and meets the original purpose of design.
The invention discloses a method for ensuring long-term anchoring of a fiber reinforced composite inhaul cable in a large-span bridge, which comprises the following steps:
step one, optimizing the shape of the inner wall of a steel sleeve
The inner cavity of the steel sleeve 4 is arranged into two sections along the axis between the loading end and the free end, the two sections are respectively corresponding to a first sleeve inner cavity and a second sleeve inner cavity, the cavity walls of the first sleeve inner cavity and the second sleeve inner cavity are respectively arranged into conical shapes which taper from the free end to the loading end, a sectional step exists between the first sleeve inner cavity and the second sleeve inner cavity, and meanwhile, the axial length of the first sleeve inner cavity is smaller than that of the second sleeve inner cavity; wherein the first sleeve lumen is disposed proximate the free end and the second sleeve lumen is disposed proximate the loading end;
two holes 6 are arranged on the steel sleeve 4 adjacent to the loading end, wherein one hole is a pouring hole, and the other hole is an overflow hole;
step two, the fiber reinforced composite material inhaul cable 1 passes through the steel sleeve 4, and the fiber reinforced composite material inhaul cable 1 is tensioned;
thirdly, sequentially jacking each steel clamping piece 3 into the steel sleeve 4;
step four, loosening the fiber reinforced composite material inhaul cable, so that the fiber reinforced composite material inhaul cable is retracted, the steel clamping piece 3 generates radial extrusion pressure on the fiber reinforced composite material inhaul cable 1, self-locking is formed by virtue of friction force between the two to anchor the fiber reinforced composite material inhaul cable, and the steel sleeve 4 and the fiber reinforced composite material inhaul cable 1 are relatively fixed;
and fifthly, pouring the load bonding medium into the steel sleeve 4 from the pouring hole until the load bonding medium overflows from the overflow hole, stopping pouring, and curing to form the bonding friction type anchoring structure.

Claims (10)

1. An anchorage device for ensuring long-term anchorage of a fiber-reinforced composite material inhaul cable in a large-span bridge comprises a steel sleeve (4), wherein the fiber-reinforced composite material inhaul cable (1) is arranged along the axis of the steel sleeve (4), one end of the steel sleeve (4) is a loading end, and the other end of the steel sleeve is a free end; the method is characterized in that: the inner cavity of the steel sleeve (4) is sequentially arranged into two sections along the axis between the free end and the loading end, and the two sections are corresponding to the inner cavities of the first sleeve and the second sleeve; the cavity walls of the first sleeve cavity and the second sleeve cavity are tapered from the free end to the loading end, the inner diameter of the narrow end of the first sleeve cavity is smaller than the inner diameter of the wide end of the second sleeve cavity, so that a segmented step is formed between the first sleeve cavity and the second sleeve cavity, and the axial length of the first sleeve cavity is smaller than that of the second sleeve cavity;
the first sleeve cavity anchors the fiber reinforced composite cable by incorporating a clip friction anchor assembly, and the second sleeve cavity anchors the fiber reinforced composite cable by bonding the friction anchor structure.
2. The anchor for ensuring long-term anchoring of fiber-reinforced composite cables in large-span bridges according to claim 1, wherein: the axial length ratio of the first sleeve inner cavity and the second sleeve inner cavity meets L 1 :L 2 ≤3:7。
3. The anchor for ensuring long-term anchoring of fiber-reinforced composite cables in large-span bridges according to claim 1, wherein: the clamping piece friction type anchoring component is formed by encircling three or four steel clamping pieces (3), and is a conical assembly component with a middle through hole on the whole; the shape of the outer wall of the conical assembly member is matched with the shape of the cavity wall of the inner cavity of the first sleeve, and the middle through hole of the conical assembly member can be used for coating the fiber reinforced composite material inhaul cable (1).
4. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the bonding friction type anchoring structure is formed by solidifying a load bonding medium (2) poured into the inner cavity of the second sleeve, and is a conical solidifying member with a middle through hole as a whole; the shape of the outer wall of the conical curing member is matched with the shape of the cavity wall of the inner cavity of the second sleeve, and the middle through hole of the conical curing member can be used for coating the fiber reinforced composite material inhaul cable (1);
the load bonding medium (2) is prepared from resin and quartz sand according to the following weight ratio of 1:0.2 to 1:1, and the rigidity of the load bonding medium (2) ranges from 2GPa to 10GPa.
5. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the taper alpha of the cavity wall of the inner cavity of the first sleeve is 2-4 degrees.
6. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the taper beta of the cavity wall of the inner cavity of the second sleeve is 3-5 degrees.
7. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the fiber reinforced composite material inhaul cable (1) comprises carbon fiber, basalt fiber, glass fiber or aramid fiber.
8. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the axial length ratio of the first sleeve inner cavity to the second sleeve inner cavity is 1:4.
9. The anchor for ensuring long-term anchoring of a fiber reinforced composite cable in a large-span bridge of claim 1, wherein: the cavity wall of the inner cavity of the second sleeve is provided with a filling hole and an overflow hole in a penetrating way.
10. A method for ensuring long-term anchoring of a fiber-reinforced composite cable in a large-span bridge, characterized in that an anchor for ensuring long-term anchoring of a fiber-reinforced composite cable in a large-span bridge according to any one of claims 1 to 9 is used for anchoring a fiber-reinforced composite cable in a large-span bridge, comprising the steps of:
step one, optimizing the shape of the inner wall of a steel sleeve
The inner cavity of the steel sleeve (4) is arranged into two sections along the axis between the loading end and the free end, the two sections are respectively corresponding to a first sleeve inner cavity and a second sleeve inner cavity, the cavity walls of the first sleeve inner cavity and the second sleeve inner cavity are respectively arranged into conical shapes which taper from the free end to the loading end, the inner diameter of the narrow end of the first sleeve inner cavity is smaller than the inner diameter of the wide end of the second sleeve inner cavity, so that a segmentation step is formed between the first sleeve inner cavity and the second sleeve inner cavity, and meanwhile, the axial length of the first sleeve inner cavity is smaller than that of the second sleeve inner cavity; wherein the first sleeve lumen is disposed proximate the free end and the second sleeve lumen is disposed proximate the loading end;
two holes (6) are formed in the steel sleeve (4) adjacent to the loading end, wherein one hole is a pouring hole, and the other hole is an overflow hole;
step two, enabling the fiber reinforced composite material inhaul cable (1) to pass through the steel sleeve (4) and tensioning the fiber reinforced composite material inhaul cable (1);
thirdly, sequentially jacking each steel clamping piece (3) into the steel sleeve (4);
step four, loosening the fiber reinforced composite material inhaul cable, so that the fiber reinforced composite material inhaul cable is retracted, the steel clamping piece (3) generates radial extrusion pressure on the fiber reinforced composite material inhaul cable (1), self-locking is formed by virtue of friction force between the two to anchor the fiber reinforced composite material inhaul cable, and the steel sleeve (4) and the fiber reinforced composite material inhaul cable (1) are relatively fixed;
pouring the load bonding medium (2) into the steel sleeve (4) from the pouring hole until the load bonding medium overflows from the overflow hole, stopping pouring, and solidifying to form the bonding friction type anchoring structure; the load bonding medium (2) is composed of epoxy resin quartz sand, and the mass ratio of the resin to the quartz sand is 1:0.2-1:1.
CN202310148980.9A 2023-02-22 2023-02-22 Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof Pending CN116104016A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310148980.9A CN116104016A (en) 2023-02-22 2023-02-22 Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310148980.9A CN116104016A (en) 2023-02-22 2023-02-22 Anchor for ensuring long-term anchoring of fiber reinforced composite inhaul cable in large-span bridge and method thereof

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Publication Number Publication Date
CN116104016A true CN116104016A (en) 2023-05-12

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