CN218147801U

CN218147801U - CFRP cable bonding type anchorage

Info

Publication number: CN218147801U
Application number: CN202222495592.1U
Authority: CN
Inventors: 余晓琳; 张生林; 贾布裕; 杨铮; 陈宇轩; 陈扬文; 张文睿; 黄凯; 黄森越; 刘昌顺
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2022-12-27
Anticipated expiration: 2032-09-21

Abstract

The utility model relates to a CFRP cable coheres type ground tackle, including anchor cup and a plurality of sleeves, the anchor cup is the hollow structure of inside, and the both ends of anchor cup have loading port and free port, and loading port and free port all communicate the inside of anchor cup, and the inside of anchor cup is the frustum structure of radius increase gradually from loading port to free port; the loading port and the free port are both connected with end blocking positioning plates, and the end blocking positioning plates are provided with fixing holes for the CFRP inhaul cables to penetrate through; the plurality of sleeves are inserted into the anchor cup and are sequentially sleeved; the plurality of sleeves are made of different materials, and the materials of all the sleeves and the anchor cup are different. The utility model discloses reduced the radial stress of loading end port department and solved the inhomogeneous phenomenon of internal force distribution in the anchor length, belong to ground tackle technical field.

Description

CFRP cable bonding type anchorage

Technical Field

The utility model relates to an ground tackle technical field, concretely relates to CFRP cable coheres type ground tackle.

Background

The cable bearing system bridge has the advantages of attractive form and small interference to navigation, gradually becomes a preferred bridge type of an ultra-large span bridge, and is widely applied to river-crossing and sea-crossing projects. The cable as the main tensile member plays an important role in the safety and durability of the bridge. The existing bridge cable mainly adopts high-strength prestressed steel wires (or steel strands) as cable body bearing materials, which are easy to corrode, and particularly, the cable is used in a cable-stayed bridge, the design service life of the cable is only 20 years, and the cable needs to be replaced for many times within a 100-year design benchmark period of the bridge, so that the whole life cycle cost of the cable bearing system bridge is increased.

The Carbon Fiber Reinforced Composite (CFRP) has the advantages of light weight, high strength and corrosion resistance, and meets the requirement of the modern bridge on the development of ultra-large span, so that the CFRP becomes an ideal material in the field of civil engineering and is researched by numerous scholars. However, compared with the traditional steel cable, because the transverse compressive strength and the shear strength of the CFRP cable are low, the conventional steel cable anchoring system cannot be applied to the CFRP cable, which is one of the important factors that restrict the CFRP cable from being widely applied at present, so that the development of a corresponding anchorage device becomes the key for popularizing and applying the FRP cable.

Conventional bond-type anchors are mainly available in the following forms:

(1) A straight-cylinder type bonding anchor device is characterized in that a bonding anchoring system is generally composed of an anchor cup, bonding media and end plugs at two ends of the bonding media, bonding stress of the straight-cylinder type anchoring device is unevenly distributed, a larger size is needed to ensure enough anchoring length, and bonding failure between a cementing material and the anchor cup can be caused, so that the bonding failure is integrally pulled out, and the failure of the anchoring system is caused.

(2) The internal cone type bond anchor is similar to a straight cylinder type anchor, but a certain taper is formed in the anchor by setting different inner diameters at the loading end and the free end, so that the phenomenon that a cementing material is pulled out in the anchoring process is avoided, but a cable at the loading port of an anchoring system can be subjected to great radial compressive stress and shearing stress, and a CFRP (carbon fiber reinforced polymer) inhaul cable is cut off.

(3) The variable-rigidity bonding type anchorage adopts an inner cone type bonding anchoring system of variable-rigidity bonding media poured in a layered mode, the bonding media are poured in 4 layers, the elastic modulus E of the variable-rigidity bonding type anchorage is gradually decreased from a free end to a loading end, a small amount of short-cut BFRP (bidirectional Forwarding protocol) wires are added into each layer of bonding media to ensure the integrity of the bonding media, and the variable-rigidity bonding type anchorage can apply uniform hoop stress to the reinforcing bars of the anchoring section, so that the reinforcing bars are effectively prevented from being cut at an anchorage device opening. Because the anchorage device is divided into 4 layers to pour different bonding media, the construction process is complex and is not beneficial to site construction.

SUMMERY OF THE UTILITY MODEL

To the technical problem who exists among the prior art, the utility model aims at: the CFRP inhaul cable bonding type anchorage device reduces the radial stress at the port of the loading end and solves the problem of uneven internal force distribution in the anchoring length.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a CFRP inhaul cable bonding type anchorage device comprises an anchor cup and a plurality of sleeves, wherein the anchor cup is of an internal hollow structure, two ends of the anchor cup are provided with a loading port and a free port, the loading port and the free port are both communicated with the inside of the anchor cup, and the inside of the anchor cup is of a cone-shaped platform structure with the radius gradually increasing from the loading port to the free port; the loading port and the free port are both connected with end blocking positioning plates, and the end blocking positioning plates are provided with fixing holes for the CFRP inhaul cables to penetrate through; the plurality of sleeves are inserted into the anchor cup and are sequentially sleeved; the plurality of sleeves are made of different materials, and the material of all the sleeves is different from that of the anchor cup.

Preferably, the sleeve is of a conical table structure and is provided with a bonding medium flow passage.

Preferably, the bonding medium flow channel is a tapered platform structure.

Preferably, the wall thicknesses of the plurality of sleeves are the same or different.

Preferably, the plurality of sleeves are the same or different in length, and the sleeves of different lengths are sequentially sleeved from the loading port to the free port, and the length of the sleeve close to the loading port is larger than that of the sleeve far away from the loading port.

Preferably, the outer diameter of the sleeve proximate the load port is greater than the diameter of the load port.

Preferably, the anchor cup is of cylindrical configuration.

Generally speaking, the utility model has the advantages that:

1. the utility model discloses a make in advance and cup joint inside the anchor cup with the different cover barrel of anchor cup material, make the radial stress of loading port department reduce greatly, prevent that the CFRP cable from being cut.

2. The utility model discloses in, because cup jointed a plurality of sleeves in the anchor cup is inside, compare in the inside internal force distribution of interior conical ground tackle more even.

3. The utility model discloses can only use a cementing material can accomplish to bond, compare in variable rigidity ground tackle and simplified the work progress.

Drawings

FIG. 1 is a perspective view of a CFRP cable-bonded anchorage.

FIG. 2 is a partial cross-sectional view of a CFRP cable-bonded anchor.

Figure 3 is a perspective view of the anchor cup.

Fig. 4 is a perspective view of the sleeve 1.

Fig. 5 is a perspective view of the sleeve 2.

Fig. 6 is a perspective view of the sleeve 3.

Fig. 7 is a perspective view of the sleeve 4.

FIG. 8 is a schematic view of a CFRP cable-bonded anchor in the casting of bonding media.

FIG. 9 is a distribution diagram of a CFRP cable.

FIG. 10 is a schematic view of the radial compressive stress experienced by the CFRP bracing wires inside the anchor.

FIG. 11 is a graph of the shear stress experienced by the CFRP bracing cable inside the anchorage.

Wherein, 1 is the anchor cup, 2 is

sleeve

1,3 is

sleeve

2,4 is

sleeve

3,5 is

sleeve

4,6 is the CFRP cable, 7 is the load port, 8 is the free port.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments.

As shown in fig. 1 and fig. 2, the CFRP cable bond type anchor of the present embodiment includes an anchor cup and a plurality of sleeves, the anchor cup is of an internal hollow structure, two ends of the anchor cup are provided with a loading port and a free port, both the loading port and the free port are communicated with the inside of the anchor cup, and the inside of the anchor cup is of a frustum structure with a radius gradually increasing from the loading port to the free port; the loading port and the free port are both connected with end plug positioning plates, and the anchor cup and the end plug positioning plates are both provided with screw holes for connecting the anchor cup and the end plug positioning plates by nuts; the end plug positioning plate is provided with a fixing hole for the CFRP inhaul cable to pass through; the sleeves are inserted into the anchor cup, the sleeves are sequentially sleeved, and the interaction between different sleeves and the anchor cup is increased by performing roughening treatment; the plurality of sleeves are made of different materials, and the materials of all the sleeves and the anchor cup are different. In this embodiment, before pouring, the CFRP cable sequentially passes through the fixing holes of the end plug positioning plate, and then the end plug positioning plate is fixedly connected with the screw holes reserved in the end of the anchor cup through the nuts.

As shown in fig. 3-7, the sleeve is a conical table structure and is provided with a bond medium flow passage.

The bond medium flow channel is a tapered platform structure.

The wall thicknesses of the plurality of sleeves may be the same or different.

The lengths of the sleeves are the same or different, the sleeves with different lengths are sequentially sleeved from the loading port to the free port, and the length of the sleeve close to the loading port is larger than that of the sleeve far away from the loading port.

The outer diameter of the sleeve proximate the load port is greater than the diameter of the load port.

As shown in fig. 1, the anchor cup is a cylindrical structure.

As shown in fig. 8, the diameter of the loading port, the diameter of the free port, the length of the anchor cup, the overall size of the anchor cup and the like are determined according to the required bearing capacity and the number of the anchoring cables, then a plurality of sleeves with different lengths and the same taper as the interior of the anchor cup are manufactured according to requirements, the thickness and the material of each layer of sleeve can be selected and manufactured according to different requirements, the sleeves are sequentially and internally overlapped in the anchor cup according to the length, finally, the CFRP cable penetrates through the loading port of the anchor to the free port for a certain length and is fixed in position by an end blocking positioning plate, after the redundant gap reserved by the loading port is processed, a bonding medium is poured from the free end of the anchor to the interior of the anchor, and the bonding medium is required to reach the required strength.

Finite element simulation calculation: and establishing a finite element model by using ABAQUS finite element software for calculation, and comparing the finite element model with an inner cone type bonding anchor device and a variable-rigidity bonding anchor device. As shown in fig. 3-7, in the process of establishing the finite element model, the number of the sleeves is 4, four sleeves are respectively sleeve 1, sleeve 2, sleeve 3 and sleeve 4, the radius of the loading port of the anchor cup is 37mm, the radius of the free port is 65mm, the overall radius of the anchor cup is 95mm, and the total length of the anchor cup is 400mm; as shown in figure 9, the radius of the CFRP inhaul cables is 2mm, 37 inhaul cables are taken, the distance between every two inhaul cables is 2mm, the CFRP inhaul cables are arranged into a regular hexagon, in order to control variables, the bonding media of the inner cone type bonding type anchorage and the sleeve type bonding type anchorage are all made of cement mortar, and the elastic modulus is 32GPa. The elastic modulus of 4 bonding media of the variable-rigidity bonding-type anchorage device from the loading end to the free end is 4GPa, 8GPa, 26GPa and 32GPa in sequence, and the thickness ratio is 2. The thicknesses of 4 sleeves of the sleeve type bonding anchorage device are all 5mm, and the elastic moduli of the sleeves 1 to 4 are 4GPa, 8GPa, 26GPa and 32GPa in sequence. Finally, compared with an internal cone type bonding type anchorage device and a variable rigidity bonding type anchorage device, the radial compressive stress borne by the CFRP inhaul cable in the anchorage device is shown in figure 10, and the shear stress is shown in figure 11.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims

1. A CFRP cable bonds type ground tackle which characterized in that: the anchor cup is of an internal hollow structure, a loading port and a free port are arranged at two ends of the anchor cup and are communicated with the inside of the anchor cup, and the inside of the anchor cup is of a cone-shaped platform structure with the radius gradually increasing from the loading port to the free port; the loading port and the free port are both connected with end blocking positioning plates, and the end blocking positioning plates are provided with fixing holes for the CFRP inhaul cables to penetrate through; the plurality of sleeves are inserted into the anchor cup and are sequentially sleeved; the plurality of sleeves are made of different materials, and the materials of all the sleeves and the anchor cup are different.

2. The CFRP cable bonding type anchor of claim 1, wherein: the sleeve is a conical table structure and is provided with a bonding medium circulation channel.

3. The CFRP cable-bonded anchor of claim 2, wherein: the bond medium flow channel is a tapered platform structure.

4. The CFRP cable-bonded anchor of claim 1, wherein: the wall thicknesses of the plurality of sleeves may be the same or different.

5. The CFRP cable bonding type anchor of claim 1, wherein: the lengths of the sleeves are the same or different, the sleeves with different lengths are sequentially sleeved from the loading port to the free port, and the length of the sleeve close to the loading port is larger than that of the sleeve far away from the loading port.

6. The CFRP cable-bonded anchor of claim 2, wherein: the outer diameter of the sleeve proximate the load port is greater than the diameter of the load port.

7. The CFRP cable bonding type anchor of claim 1, wherein: the anchor cup is cylindrical structure.