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Anchoring method applicable to large-tonnage FRP inhaul cable

An anchoring method and large-tonnage technology, applied in the direction of sheet pile walls, structural elements, building components, etc., can solve problems such as stress concentration, and achieve the effects of regular cross-sectional shape, good bonding performance, and simple and convenient molding process

Active Publication Date: 2014-03-26
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: Aiming at the bonded anchoring method, which can only anchor small-diameter FRP cables, in the clip-type anchoring method, stress concentration problems will occur between the FRP cables and the steel clips due to sudden changes in stiffness. The anchorage method of FRP cable that can guarantee the anchorage efficiency and the long-term performance of the anchorage system

Method used

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  • Anchoring method applicable to large-tonnage FRP inhaul cable
  • Anchoring method applicable to large-tonnage FRP inhaul cable
  • Anchoring method applicable to large-tonnage FRP inhaul cable

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1: See figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 shown. figure 1 It is a structural schematic diagram of the FRP cable anchor of the present invention, figure 2 It is a schematic diagram of the winding fiber anchoring of Embodiment 1 of the present invention, image 3 It is a schematic diagram of the structure of the steel clip in Embodiment 1 of the present invention, Figure 4 It is a structural schematic diagram of the steel anchor cup of Embodiment 1 of the present invention, Figure 5It is a schematic diagram of the notch effect of the FRP tendon / cable anchorage system. The load transmission medium 300 used in this embodiment is a steel clip 3 , including an FRP cable 1 , a molded protective layer 2 , a tapered steel clip 3 and a steel sleeve 4 . First wind the fiber roving 6 of the pre-impregnated resin 5 on the surface of the FRP cable, select different winding layers according to the diameter of the anchoring FRP cable, and mold ...

Embodiment 2

[0035] Example 2: See Figure 6 shown. Its basic structure is the same as that of Embodiment 1, except that the load transmission medium 3 is an expansion material 5 . First, the fiber roving pre-impregnated on the surface of the FRP cable is wound, and the number of winding layers is selected according to the diameter of the anchoring FRP cable. After molding, the FRP cable 1 and the protective layer 2 are molded into a whole. The interface between the cable 1 and the protective transition layer 2 has extremely high shear strength, forming a stressed buffer layer to indirectly protect the FRP cable. Then pour the expansion material 5 between the steel anchor cup 4 and the molded FRP cable 1 with a protective transition layer 2, and rely on the positive interface pressure generated by the expansion material 5 after solidification and expansion to provide the anchoring force, that is, an FRP cable anchoring system is formed .

Embodiment 3

[0036] Example 3: See Figure 7 shown. Its basic structure is the same as that of Embodiment 1, except that the load transmission medium 3 is a material 6 with radial stiffness variation. Figure 8 , Figure 9 , Figure 10 The distribution curves of radial compressive stress and shear stress on the surface of FRP cables, the solid line is the load transfer material A without mechanical performance design, and the dotted line is the load transfer material B designed according to the stress distribution in the anchorage area, after the mechanical performance design The anchorage system can effectively reduce the stress peak at the beginning of loading in the anchorage area, which is beneficial to the stress of anisotropic FRP cables in the anchorage area, and can anchor multiple FRP cables.

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Abstract

The invention discloses an anchoring method applicable to a large-tonnage (larger than 50 tones) FRP inhaul cable. The FRP inhaul cable is anchored with a clamping piece type anchorage device, a protection transition layer with the length no smaller than the length of an anchoring area of the clamping piece type anchorage device is formed at the anchoring end of the FRP inhaul cable, the protection transition layer and the FRP inhaul cable are integrated, and the clamping piece type anchorage device is anchored to the protection transition layer. After the FRP inhaul cable and the protecting layer are pressed into a whole, while the shearing strength of the FRP inhaul cable and a protecting layer interface is increased, the phenomenon that the FRP inhaul cable weak in transverse strength makes direct contact with load transmitting mediums large in rigidity in the anchoring area can be avoided, a stressed buffering layer is formed, and the FRP inhaul cable can be indirectly protected. The anchoring method used for anchoring the FRP inhaul cable has the advantages of facilitating construction and being high in anchoring efficiency and the like, long-term performance of an anchoring system can be guaranteed, the method can also be used for tensile tests on the FRP inhaul cable, samples can be prepared easily and conveniently, and compared with an adhesive type anchoring method, test errors caused by overlarge shearing deformation of resin can be avoided.

Description

technical field [0001] The invention relates to the technical field of cable anchoring for infrastructure structures such as civil engineering, transportation, energy and the environment, and in particular to the cable anchoring technology prepared by fiber reinforced composite materials. Background technique [0002] Fiber Reinforced Polymer (FRP) has the advantages of high strength, light weight, corrosion resistance and fatigue resistance. FRP cable is a composite material made of fiber yarn impregnated with resin in a certain proportion and formed by pultrusion process. It is an ideal substitute for steel bars and steel cables in civil engineering applications. It is currently used in bridges, hydraulic structures, seaports, docks and reinforcement projects. has been applied. [0003] Although FRP cables have broad prospects in the field of civil engineering, the practical anchoring system in engineering has yet to be perfected, especially for FRP cables with large diam...

Claims

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Application Information

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IPC IPC(8): E01D19/14E02D5/74E04C5/12
Inventor 吴智深汪昕徐鹏程朱中国
Owner SOUTHEAST UNIV
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