CN101864725B - FRP (Fiber Reinforce Plastic) tendon and steel strand connector and compound stay cable - Google Patents

Abstract

The invention discloses a FRP tendon-steel strand connector and a composite cable that can improve the processing yield and installation survival rate. A steel hinge anchor is provided between the two for anchoring with the steel hinge, and a hollow connector with a filling cavity is fixedly connected to the two. The filling cavity accommodates the inner end and the inner end of the steel hinge end connector. The inner end of the FRP tendon bonding part and the steel hinge wire anchor, and the hollow connector is also provided with a data line lead-out hole; the composite cable includes a section of FRP tendon, and the axial sides of the FRP tendon pass through the two described connections. Each device is connected to a section of steel hinge line. The two ends of the section of FRP bars are respectively located in the through holes of the corresponding FRP bar bonding parts. The through holes are filled with bonding materials, and the two sections of steel hinge lines pass through the corresponding steel hinges respectively. The wire end connector is anchored to the corresponding steel hinge wire anchor, and the filling cavity is filled with bonding material, which can be used in the technical field of intelligent monitoring of the internal force of large bridge cables or suspenders.

Description

FRP bar and steel strand connector and composite cable

technical field

The invention relates to a device for reliably connecting FRP bars and steel strands and a technique for forming a composite cable using the connector.

Background technique

At present, cables and suspenders are the key stress-bearing components of modern long-span suspension bridges, cable-stayed bridges and under-supported arch bridges, and their working status is the main determinant factor for judging whether the bridge as a whole is in a normal state. Due to the long detection interval and the inability to prevent sudden safety accidents, the traditional bridge regular inspection method can no longer adapt to the management and maintenance of such large bridges.

The smart cable that combines the fiber grating sensing element with the fiber composite material, that is, FRP and the substrate, is a new technology for long-term real-time monitoring of the internal force state of the bridge cable, and it is also a research hotspot in the bridge engineering and academic circles. , but the length of the cables of large bridges can be hundreds of meters or even thousands of meters. The cost of replacing high-strength steel strands with full FRP smart cables of equal length is very high, and the technical requirements for the processing and installation of FRP smart cables are extremely high. High, resulting in low processing yield and installation survival rate.

FRP ribs generally use multiple FRP rods embedded with fiber grating sensing elements to be tightened with heat shrinkable tubes to form a bundle.

Contents of the invention

In order to overcome the deficiencies of the existing FRP intelligent cables, such as high cost, low processing yield and low installation survival rate, the technical problem to be solved by the present invention is to provide a connector for FRP bars and steel strands and a connector formed using this connector. Composite cable, using this connector, can reliably connect a piece of FRP tendon with the steel strands at both ends to form a composite smart cable, its function and tensile strength are equivalent to FRP smart cable, but the processing yield and installation of the cable The survival rate can be greatly improved.

Connectors between FRP bars and steel strands, including steel hinge wire end connectors and FRP tendon bonding parts, the steel hinge wire end connectors are provided with through holes from the outer end to the inner end, and the FRP tendon bonding parts are also provided There is a through hole from the outer end to the inner end, and a steel hinge wire anchor for anchoring with the steel hinge wire is provided between the inner end of the steel hinge wire end connector and the inner end of the FRP tendon bonded part, with filling The cavity-filled hollow connecting piece fixedly connects the steel hinge wire end connecting piece and the FRP tendon bonding piece, and the filling cavity accommodates the inner end of the steel hinge wire end connecting piece, the inner end of the FRP tendon bonding piece and the As for the steel hinge wire anchor, the hollow connecting piece is also provided with a data line lead-out hole.

A section of the through hole near the inner end of the FRP tendon bonding part is a tapered hole, and the large-diameter end of the tapered hole is the inner end.

A buffer washer matching the diameter of the through hole is provided in a section near the outer end of the through hole on the FRP tendon bonding member.

There are intervals between the steel hinge wire anchor piece and the inner end of the steel hinge wire end connecting piece and the inner end of the FRP tendon bonding piece.

The hollow connecting piece is provided with a pressure injection hole and an air outlet hole, and the filling cavity is filled with a bonding material.

A data line holder is arranged on the outer wall of the hollow connector.

The hollow connecting piece is a sleeve provided with internal threads, and the steel hinge wire end connecting piece and the FRP tendon bonding piece are respectively provided with external threaded sections.

The hollow connector is pin-connected to the steel hinge wire end connector and the FRP tendon bonding member respectively.

Composite cable, including a section of FRP tendon, the axial sides of the section of FRP tendon are respectively connected with a section of steel hinge wire through two "FRP tendon and steel strand connectors", and the two ends of the section of FRP tendon are respectively It is located in the through hole corresponding to the FRP tendon bonding part, and the through hole is filled with bonding material. The two steel hinge wires respectively pass through the corresponding steel hinge wire end connectors and are anchored to the corresponding steel hinge wire anchors. The filling cavities are all filled with bonding materials.

The length of the FRP bars is ≤3m.

The beneficial effects of the present invention are: each part can be processed by the existing mature technology, the assembly is convenient, and the process requirements are low; it is proved by the tensile test test and engineering practical application that the connector works reliably and has stable performance. The full FRP smart cable with the same length can save costs, reduce the technical requirements for processing and installing FRP smart cables, and improve the yield and installation survival rate.

Description of drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a schematic diagram of steel parts connected by steel hinge wire ends.

Fig. 3 is a schematic diagram of an FRP tendon bonded part.

Fig. 4 is a schematic diagram of a hollow connector.

Figure 5 is a schematic diagram of a composite cable.

Marked in the figure, 1-steel hinge wire end connector, 2-steel hinge wire anchor, 3-hollow connector, 4-FRP tendon bonded parts, 5-buffer washer, 6-pin, 7-data cable lead-out Hole, 8-data line holder, 9-data line, 10-filling cavity, 11-outer end, 12-inner end, 13-steel hinge, 14-FRP tendon, 15-steel hinge, 16-pin , 17-bonding material, 18-pin hole, 19-pin hole, 20-pin hole, 21-pin hole, 31-air outlet, 40-tapered hole, 41-outer end, 42-inner end, 43- bonding material.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the FRP bar and steel strand connector of the present invention includes a steel hinge wire end connector 1 and an FRP tendon bonding part 4, and a steel hinge wire end connector 1 There is a through hole from the outer end 11 to the inner end 12 on the top, and the FRP tendon bonding part 4 is also provided with a through hole from the outer end 41 to the inner end 42. 12 and the inner end 42 of the FRP tendon bonder 4 are provided with a steel hinge wire anchor 2 for anchoring with the steel hinge wire 13, and the hollow connector 3 with the filling cavity 10 connects the steel hinge wire end connector 1 It is fixedly connected with the FRP tendon bonding part 4, and the filling cavity 10 accommodates the inner end 12 of the steel hinge wire end connector 1, the inner end 42 of the FRP tendon bonding part 4 and the steel hinge wire anchor 2, The hollow connector 3 is also provided with a data line lead-out hole 7 . Using the FRP bar and steel strand connector, the FRP bar and steel strand can be reliably connected into a composite cable. This composite cable not only retains the real-time monitoring function of the full FRP intelligent cable, but also has cost advantages, and The processing yield and installation survival rate are higher.

As shown in Figures 1 and 3, in order to improve the anchoring capacity, a section of the through hole on the FRP tendon bonding part 4 close to the inner end 42 is a tapered hole 40, and the large diameter end of the tapered hole 40 is the inner end .

As shown in Figure 1, in consideration of the low transverse shear strength of the FRP tendon, a buffer washer 5 matching the diameter of the through hole is provided in a section where the through hole on the FRP tendon bonding part 4 is close to the outer end 41, so as to avoid Stress concentration leads to fracture of reinforcing fibers in FRP tendons.

As shown in Figures 1 and 5, there are intervals between the steel hinge wire anchor 2 and the inner end 12 of the steel hinge wire end connector 1 and the inner end 42 of the FRP tendon bonding part 4, so as to accommodate filling materials And FRP rib end and data line 9.

As shown in Figures 1 and 3, the hollow connector 3 is provided with a pressure injection hole 31 and an air outlet, and the data line outlet hole 7 can be used as an air outlet. Cavity 10 is filled with adhesive material 17 .

As shown in FIG. 1 , FIG. 3 and FIG. 5 , a data line holder 8 is provided on the outer wall of the hollow connector 3 to facilitate the extraction and protection of the sensor optical cable, that is, the data line 9 .

As shown in Figure 1, Figure 3 and Figure 5, the hollow connector 3 is a sleeve provided with an internal thread, and the steel hinge wire end connector 1 and the FRP tendon bonding part 4 are correspondingly provided with an external thread segment , using threads for fastening connections.

As shown in Figure 1, Figure 2, Figure 3 and Figure 5, in order to further improve the reliability of the connection and facilitate the positioning during assembly, the hollow connector 3 can also be connected to the steel hinge wire end connector 1 and FRP respectively. The rib bonding parts 4 are pin-connected, the pin hole 18 on the steel hinge wire end connector 1 corresponds to the pin hole 21 on the hollow connector 3 and matches with the pin 6, and the pin hole 19 on the FRP tendon bonding part 4 matches with the pin hole 21 on the hollow connector 3. The pin hole 20 on the hollow connector 3 corresponds to and matches with the pin 16 .

As shown in Fig. 5, the composite cable of the present invention includes a section of FRP tendon 14, and the axial sides of the section FRP tendon 14 are respectively connected with a section of steel hinge through two described "FRP tendon and steel strand connectors". Lines 13, 15, the two ends of the FRP bars 14 of this section are respectively located in the through holes of the corresponding FRP bar bonding parts 4, and the through holes are filled with bonding materials 43, and the two sections of steel hinge lines 13, 15 respectively pass through Corresponding to the steel hinge wire end connector 1 and anchored to the corresponding steel hinge wire anchor 2 , the filling cavities 10 are filled with adhesive material 17 .

Generally, according to the length of the dragline in engineering practice, the length of the FRP tendon 14 can be about 1.5m, generally no more than 3m long, which can ensure that its sensor in use can realize the tension monitoring function. At the same time, the 14 sections of FRP tendon If the length of the cable is too long, its processing yield and installation survival rate will decrease, and the advantage of using the composite cable of the present invention is not obvious.

Example:

As shown in Figures 1 to 5, the whole cable consists of a section of fiber grating sensing embedded FRP tendon 14, two sections of high-strength steel strands 13, 15, two pieces of steel strands anchored to steel piece 1, and two pieces of FRP Rib bonding part 4 and two hollow connecting parts 3 are formed. The lengths of steel strands 13, 15 are determined according to actual needs.

During production, first tighten 4 to 7 FRP rods with a length of about 150 cm that have been embedded with fiber grating sensing elements to form a bundle of FRP tendons. Not greater than the requirement of 5000με. A section of the through hole on the FRP tendon adhesive 4 close to the inner end 42 is a tapered hole 40, the large diameter end of the tapered hole 40 is the inner end, and the part where the two ends of the FRP rod bundle enter the tapered hole 40 should be wound Concave-convex pattern, the concave-convex pattern can be extruded to form the resin material around the FRP bar when it is heat-shrinked, and the FRP rods at the end of the FRP rod bundle are slightly spread out to enhance the pull-out resistance and significantly improve its anchoring Capability, and pour bonding material 43 into the through hole on the FRP tendon bonding part 4 to anchor, if the bonding material 43 adopts resin, then because the base material and bonding material of the FRP tendon are both resin, the gap between the two Produces a strong bond. Considering the low transverse shear strength of the FRP rod bundle, a buffer washer 5 matching the diameter of the through hole is provided in a section of the through hole on the FRP tendon bonding part 4 close to the outer end 41, so as to avoid stress concentration causing the FRP tendon Internal reinforcement fibers are broken.

The steel strand anchor 2 may, for example, be composed of a common OVM extruded fixed-end P-type anchor head and a steel stopper.

The outer walls of the FRP tendon bonding part 4 and the steel strand end connector 1 are all processed into trapezoidal external threads, which can be assembled into one body through a sleeve that is processed as a hollow connector 3 with internal threads; the sleeve is bonded to the FRP tendon Pinholes are provided on the knot 4 and the steel strand end connector 1 for positioning during assembly; a data line holder 8 is arranged in the outer wall of the sleeve to facilitate the extraction and protection of the data line 9.

In order to ensure the processing quality and bonding and anchoring performance, the production of FRP tendons 14 and the bonding and anchoring process of FRP tendon bonding parts 4 should be completed in the factory, and the tensile test should be carried out to check the anchoring performance and calibrate the fiber grating sensor. When carrying out the tensile test, the hollow connector 3 and the FRP tendon bonding member 4 and the steel strand end connector 1 are only threaded, and no bonding material is poured into the filling cavity 10 temporarily. The steel strand anchor 2 is anchored to the steel strand at the bridge construction site, and then the hollow connector 3 is assembled. The cavity 10 is injected with adhesive material 17 again, and the hollow connector 3 is reserved with an injection hole 31 and an air outlet.

The bonding materials 43 and 17 used in the FRP tendon bonding part 4 and the pouring cavity 10 can be determined by comparing the tensile test results. Generally, resin bonding materials are used, such as epoxy resin, epoxy resin mortar, epoxy iron sand, etc. .

Claims (10)

1. The FRP bar and steel strand connector is characterized in that: it includes a steel hinge wire end connector (1) and an FRP tendon bonding piece (4), and the steel hinge wire end connector (1) is provided with a The through hole from the end (11) to the inner end (12), and the FRP tendon bond (4) is also provided with a through hole from the outer end (41) to the inner end (42). Between the inner end (12) of (1) and the inner end (42) of the FRP tendon bonding part (4), a steel hinge wire anchor (2) for anchoring with the steel hinge wire (13) is arranged, with filling The hollow connecting piece (3) of the filling cavity (10) fixedly connects the steel hinge wire end connecting piece (1) and the FRP tendon bonding piece (4), and the filling cavity (10) accommodates the steel hinge wire end connecting piece The inner end (12) of (1) and the inner end (42) of the FRP tendon bonding part (4) and the steel hinge anchor (2), the hollow connector (3) is also provided with a data line Lead out hole (7). 2. The connector of FRP bars and steel strands according to claim 1, characterized in that: a section of the through hole on the FRP bar bonding member (4) close to the inner end (42) is a tapered hole (40 ), the large diameter end of the tapered hole (40) is the inner end. 3. The FRP bar and steel strand connector according to claim 1, characterized in that: the through hole on the FRP bar bonding part (4) is provided with a through hole in a section close to the outer end (41) Cushion washer (5) with matching diameter. 4. The FRP bar and steel strand connector according to claim 1, 2 or 3, characterized in that: the steel strand anchor (2) and the inner end (1) of the steel strand end connector (1) 12) and the inner end (42) of the FRP tendon bonding part (4) are all spaced. 5. The FRP bar and steel strand connector according to claim 1, 2 or 3, characterized in that: said hollow connector (3) is provided with injection holes and air outlet holes (31), said filling The cavity (10) is filled with adhesive material (17). 6. The connector for FRP bars and steel strands according to claim 1, 2 or 3, characterized in that: a data line holder (8) is arranged on the outer wall of the hollow connector (3). 7. The FRP bar and steel strand connector according to claim 1, 2 or 3, characterized in that: the hollow connector (3) is a sleeve provided with internal threads, and the steel strand ends are connected The part (1) and the FRP tendon bonding part (4) are correspondingly provided with external thread segments. 8. The FRP tendon and steel strand connector according to claim 7, characterized in that: the hollow connector (3) is connected to the steel strand end connector (1) and the FRP tendon bonding member ( 4) Pin connection. 9. The composite cable using the FRP bar and steel strand connector described in claim 1, 2 or 3, is characterized in that: it includes a section of FRP bar (14), and the section of FRP bar (14) passes through both sides of the axial direction. The two FRP bars and steel strand connectors are respectively connected with a section of steel strands (13, 15), and the two ends of the section of FRP bars (14) are respectively located in the passages of the corresponding FRP bar bonding parts (4). The holes and through-holes are filled with bonding material (43), and the two steel strands (13, 15) respectively pass through the corresponding steel strand end connectors (1) and are anchored to the corresponding steel strand anchors (2), the filling cavity (10) is filled with adhesive material (17). 10. The composite cable according to claim 9, characterized in that: the length of the FRP tendon (14) is ≤3m.

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