JPH10183531A - Connecting member for bridge fall preventing device, its anchoring method, and bridge fall preventing device utilizing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting member realizing design strength without being rusted by using strand-like FRP twisted with multiple fiber-reinforced plastic single wires impregnated with a thermosetting resin in continued fibers having specific fiber tensile strength or above for the connecting member of a bridge fall preventing device connecting two sets of girders. SOLUTION: The end sections of two sets of girders 11, 12 are supported on a upper part of a bridge pier 22 via an elastic support device 13, and brackets 20, 20 provided on girder webs 21 are connected by a strand-like FRP reinforcing member. A single wire having the reinforcing fiber tensile strength of 3920MPa or above can be used to constitute the FRP reinforcing material, a thermosetting resin which is a base material is a material extremely excellent in durability, and the FRP member itself is not corroded. Each fiber-reinforced plastic single wire constituting the FRP member is covered with organic fibers, and a double corrosion-proof effect can be expected. When the FRP reinforcing member is used for a connecting member 1a, it exerts design strength without being rusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting member for a bridge-preventing device for suppressing seismic force in a road bridge, a railway bridge, etc., and preventing a main girder from falling from an abutment due to seismic force, and a fixing method thereof. The present invention relates to a bridge fall prevention device using the same.

[0002]

2. Description of the Related Art Conventionally, means for providing an existing bridge with a bridge prevention structure as a countermeasure against earthquakes include a movement limiting device and a bridge prevention device (a structure for connecting a girder and a lower structure, a structure for providing a protrusion on a girder or a lower structure, There are a method of installing a double girder (a structure for interconnecting two columns) and a method of widening a seating surface (a method of extending a girder and a method of expanding a top edge of a lower structure). According to the reference materials (draft) for the mutatis mutandis application of "Specifications related to the restoration of road bridges damaged by the Hyogoken-Nanbu Earthquake" (June 1995, Japan Road Association), Furthermore, it is desirable to provide a plurality of bridge prevention structures, and various movement restriction devices and structures of bridge prevention devices are introduced. In particular, a bridge-prevention device having a structure in which two main girders are connected to each other has been studied in the past because it can limit excessive horizontal movement distance of girders even in a relatively large earthquake. There are known connections by steel bars and steel wires, connections by plates and pins, connections by chains, connections by links, and the like. Above all,
A bridge prevention device using steel rods or steel wires as connecting members
It can be applied to both concrete girder and steel girder, and the prevention device of this structure has been developed and put on the market. For example, according to Patent Nos. 962688 and 962691, it is reported that the main girder is connected with a steel bar or the like to suppress excessive horizontal movement of the girder and prevent the bridge girder from falling.

FIG. 5 is a conceptual view of a PC steel type to which a bridge prevention device of a general inter-girder connection type is mounted. In the figure, a double girder 11 is mounted on a bridge girder 22 via an elastic bearing device 13. , 12 are supported at each end, and each digit 1
Bracket 1 provided on existing web 21 of 1 and 12 girders
0 and 10 are connected using the connecting member 1a.
However, when a steel member is used for the connecting member 1a, since rust is inevitable, rust prevention treatment is required for the steel connecting member, which is a main member of the bridge prevention device. When a steel wire, such as a multi-strand PC steel stranded wire, is used as a connecting member, it is generally known that the stranded wire is coated with polyethylene and then the gap between the stranded wire and the polyethylene coating is filled with grease to prevent corrosion of the steel wire. Have been. However, in this method, there is a concern that grease leaks when the outside air temperature rises and the effect of complete rust prevention is lost due to the prevention device installed outdoors, and the steel connecting member is completely rust-proofed for a long time to achieve the design strength. Had a problem. Also, materials other than steel wires, such as steel rods, chains, etc., have no more reliable rust prevention means than steel wires, and it is very difficult to completely rust prevent the connection members over a long period of time. There was a problem in achieving design strength over a long period of time.

[0004] In addition, when the fall prevention device is mounted on an existing bridge, the work must be performed in a high place and in a limited space. Therefore, a lighter and more compact fall prevention device is required. However, the bridge-prevention devices that have been developed and marketed so far, including the connecting members, are all made of steel (excluding cushioning material), and in fact, they cannot always be said to have good workability in handling heavy objects. Was.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent a connecting member, which is a main member of a prevention device, from being rusted even in a long-term outdoor environment. An object of the present invention is to provide a lightweight and compact anti-falling device that exhibits design strength and is lightweight as a whole.

[0006]

In other words, a connecting member for an anti-bridging device according to the present invention has a fiber tensile strength of 3920 MP, which is connected to a connecting member of the anti-bridging device having a structure for connecting two girders to each other.
a It is characterized by using a strand-like FRP reinforcing material obtained by combining a plurality of single fibers made of fiber-reinforced plastic in which a thermosetting resin is impregnated into the above continuous fibers and then curing the resin. Further, the present invention is characterized in that the continuous fiber is a connecting member for an anti-bridging device using a carbon fiber having a fiber tensile strength of 3920 MPa or more. Further, the present invention is characterized by a connecting member for a bridge prevention device using the FRP reinforcing material having a coating layer made of a polymer material as a connecting member. Further, in the present invention, the inner diameter of the fixing bracket is larger than the outer diameter of the FRP reinforcing member, and the taper shape has an angle of 2 ° to 10 ° with the longitudinal direction of the bracket so that the inner diameter of the bracket increases rearward. An FRP reinforcing material having an end untwisted by a length corresponding to the length of the fitting is inserted into a fitting for fixing the end of the strand-like FRP reinforcing material having an outer diameter parallel to the longitudinal direction and having a threaded process. A method for fixing a connecting member for a bridge prevention device using a connecting member in which a gap with the inner diameter is filled with a filler is characterized. Further, the present invention is characterized by a fall prevention device using the above connecting member. Further, the bridge-fall prevention device of the present invention uses the FRP reinforcing material as a connecting member, applies the above-described fixing method to both ends, and provides a cushioning material 4, a supporting plate 5, a spring outside the fixing bracket in order toward the end of the bridge-fall prevention device. 6, supporting plate 7,
A nut 8 is arranged, and a split deflector 3 having a convex curved surface having a curvature of 80 times or more the diameter of the FRP reinforcing member inward from the end of the bridge prevention device is fixed to the fixing bracket end inside the bridge prevention device. And at least 0.5 times the outer diameter of the fixing bracket. In addition, the bridge-fall prevention device of the present invention uses the FRP reinforcing material according to claim 1, 2, or 3 as a connecting member, performs the fixing method according to claim 4 on both ends, and faces the end of the bridge-fall prevention device outside the fixing bracket. In this order, the cushioning material 4, the support plate A26, the spring 6, the support plate B27, and the nut 8 are arranged, and a convex having a radius of curvature of 30 times or more the radius of the FRP reinforcing member is provided inward from the end of the bridge prevention device. A split deflecting device having a curved surface is arranged at a location at least 0.5 times the outer diameter of the fixing bracket from the end of the fixing bracket inside the bridge fall prevention device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view in which an inter-girder connection type bridge prevention device according to the present invention is mounted. 2 is a partially enlarged view of FIG. 1, FIG. 3A is a longitudinal sectional view of FIG. 2, and FIG.
FIG. 3 is a right side view of FIG. In FIG. 1, pier 2
2 on the upper part of the two through an elastic bearing device 13
2 are supported, and brackets 20, 20 provided on the girder webs 21 of the respective girder 11, 12 are connected using the strand-like FRP reinforcing material 1.

The FRP reinforcing material 1 is formed by combining a plurality of single wires made of fiber reinforced plastic and curing the resin. The single wire constituting the FRP reinforcing material 1 is made of fiber reinforced plastic, and any fiber can be used as long as the reinforcing fiber has a tensile strength of 3920 MPa or more. Examples of the reinforcing fiber include carbon fiber. Examples of the matrix resin include a thermosetting resin such as an epoxy resin and an unsaturated polyester resin, and a thermoplastic resin such as a polyphenylene sulfide resin. Further, the surface of the single wire may be coated. The diameter of the single wire constituting the FRP reinforcing material 1 is preferably in the range of 2 to 10 mm. Further, the FRP reinforcing material 1 is preferably a combination of a plurality of single wires made of fiber reinforced plastic, but may be a single wire bundled in parallel or pseudo-parallel (from a long length).
Although not shown, the outside of the FRP reinforcement 1 is
Coating treatment may be performed to prevent scratches, improve weather resistance, or improve corrosion resistance. Examples of the coating material include polymer materials such as polyethylene. The thickness of the coating material is preferably in the range of 0.1 to 5 mm from the viewpoint of molding and construction.

At the end of the FRP reinforcing member 1, a fixing bracket 2 is provided.
Is provided. This fixing bracket is made of FRP reinforcing material 1
Which is subject to forces acting on
A steel material is preferable in terms of characteristics and cost, and carbon steel for machine structure, nickel chrome steel, chromium molybdenum steel, and the like are preferable. Further, the outer surface of the fitting is preferably subjected to a surface treatment such as galvanizing to improve corrosion resistance. In addition, fixing fixture 2
Are inserted through holes 15 of the support plate 14 provided on the bracket 20. More specifically, in the bracket 20, the substrate 16 is fixed to the beams 11, 1 by the fixing bolts 17.
2 is fixed to the existing web 21 and the support plate 14
Is fixed to the substrate 16. A first parallel support plate 18 and a second parallel support plate 19 are fixed to the substrate 16 so as to extend from both side surfaces of the support plate 14, and a parallel spacing plate 23 is provided between the first parallel support plates 18. Inside, surrounded by the first parallel support plate 18 and the parallel spacing plate 23,
In addition, the deflecting device 3 is placed at a position at least 0.5 times the outer diameter of the fixing device from the end of the fixing device inside the bridge prevention device.
The deflecting device 3 is fixed to an inner surface of the deflecting device 3 by a set bolt 9 provided on the first parallel support plate 18.

The deflecting device 3 is provided with an insertion hole 24 which is divided into two and whose diameter is enlarged at the tip end side. The FRP reinforcing member 1 is inserted through the insertion hole 24. The insertion hole 24 has a diameter of 8 mm of the FRP reinforcing material 1 inward from the end of the fall prevention device.
It has a convex curved surface having a curvature of 0 times or more. The deflecting device 3 is designed to prevent local bending stress from being generated in the connecting member, to prevent bending and shearing stress from being generated in the fixing member, and to prevent bending stress from being generated in the connecting member with respect to bending in all directions due to seismic force. In view of the above, examples of the material include steel, aluminum, resin, and synthetic rubber. The cushioning material 4 is preferably a chloroprene-based or neoprene-based synthetic rubber or the like because it has a function of alleviating the impact force and is also required to have flame retardancy, oil resistance, and weather resistance. About 50 to 60 ° is desirable. The cushioning material 4 and the supporting plate 5 are provided on the side of the support plate 14 opposite to the surface on which the deflecting device 3 is provided, and are fitted to the fixing device 2. A coil-shaped spring 6 is fitted on the screw shaft portion 25 with one end of the screw shaft portion 25 abutting on the support plate 5. The other end of the spring 6 is pressed via a washer 7 by a double nut 8, 8a screwed into the screw shaft portion 25.

The supporting plate 5 takes a reaction force by pressing a tensile force acting on the fixing bracket against the flange portion of the bracket 10, and is preferably made of a steel material in terms of workability, characteristics and cost. Carbon steel for machine structure, rolled steel material for general structure and the like are preferable. Further, the outer surface is preferably subjected to a surface treatment such as galvanization to improve corrosion resistance. The thickness is desirably 10 to 30 mm. Further, the spring 6 acts to alleviate the impact force like the cushioning material. Spring constant,
The average diameter of the spring, the wire diameter of the spring material, the number of turns, and the like differ depending on the design load. Further, the washer 7
As the material, a steel material is preferable in terms of workability, characteristics, and cost, and carbon steel for machine structure, rolled steel material for general structure, and the like are preferable. Further, the outer surface is preferably subjected to a surface treatment such as galvanization to improve corrosion resistance.

The nut 8 is preferably made of steel from the viewpoints of workability, characteristics and cost, and is preferably carbon steel for machine structure, rolled steel material for general structure and the like. Further, the outer surface is preferably subjected to a surface treatment such as galvanization to improve corrosion resistance. The set bolt 9 is for attaching the deflector 3, and is preferably made of a steel material in terms of workability, characteristics, and cost, and is preferably a carbon steel for machine structure, a rolled steel material for general structure, or the like. Further, the outer surface is preferably subjected to a surface treatment such as galvanization to improve corrosion resistance. After the bracket 10 incorporates the connecting member and other accessories integrally,
Since it is a casing for attaching to the girder web 21 and a member to which horizontal force due to an earthquake is transmitted, it is necessary to have sufficient rigidity and strength. As the material, a steel material is preferable in terms of workability, characteristics, and cost, and a rolled steel material for a general structure, a rolled steel material for a welded structure, a weather-resistant hot-rolled steel material for a welded structure, and the like are preferable. Further, the outer surface is preferably subjected to a surface treatment such as galvanization to improve corrosion resistance. The thickness is desirably 10 to 30 mm.

[0013]

The FRP reinforcing material 1 is a strand-like FRP member obtained by combining a plurality of single fibers made of fiber-reinforced plastic in which continuous fibers are impregnated with a thermosetting resin, and then curing the resin. Since the thermosetting resin (e.g., epoxy resin) is a material having extremely excellent corrosion resistance, the FRP member itself does not corrode. Further, since the single fiber made of fiber reinforced plastic constituting the strand-like FRP member is covered with the organic fiber one by one, a double anticorrosion effect can be expected. Further, on the outside of the strand-like FRP reinforcing material, a tube-shaped coating layer may be provided for preventing scratches, etc., thereby improving the anticorrosion property,
It can be considered as a triple anticorrosion structure. When the FRP reinforcing material 1 is used for the connecting member as described above, even if the FRP reinforcing material 1 is installed outdoors for a long period of time, it does not rust unlike steel-made ones.
A design load can be developed over a long period of time.

When the reinforcing fiber used for the FRP reinforcing material has a tensile strength of 3920 MPa and a fiber volume content of 60%, the tensile strength of the fiber-reinforced plastic becomes 2350 MPa, which is a normal PC.
It is possible to obtain a steel wire having a higher strength. Therefore, under equal design loads, F
The RP stranded wire requires a smaller cross-sectional area of the connecting member,
As a result, it is possible to reduce the weight and size of various accessory parts including the fixing fitting 2. FR using PC steel strand
In order to realize a load transmission equivalent to that of a P stranded wire, there are conceivable methods of increasing the cross-sectional area and forming a multi-type bundle of a plurality of stranded wires. The former increases the diameter of the stranded wire and loses flexibility. If the flexibility is lost, the handleability will be degraded, and it will be more difficult to attach the preventive device in a high place and in a limited space. Also, in the latter case, the connection with the attached parts such as the fixing unit is complicated, and as a result, the construction is not adversely affected. Furthermore, the specific gravity of the FRP reinforcing material 1 is about 1.6,
Since the weight is one fifth of iron, the weight of the connecting member is 5
It is possible to reduce it by a factor of one or less.

Further, as a result of studying various fixing methods in order to ensure the features of the present invention, the fixing method disclosed in Japanese Patent Application No. 8-015034 (not disclosed) of the applicant of the present invention, ie, a fixing bracket The inner diameter of the bracket 2 is 2 ° or more with the longitudinal direction of the bracket.
By having a tapered shape with an angle of 10 °,
It is possible to realize a compact fixing unit having excellent strength characteristics without fear of detachment in the fixing unit.

[0016]

【Example】

Example 1 Carbon fibers (T700 manufactured by Toray Industries, Inc.) were bundled with continuous fibers impregnated with a general-purpose epoxy resin to produce single wires having diameters of 4.2 mm and 4.4 mm, and the surfaces thereof were coated with synthetic fibers. A total of 37 kinds of single wires were combined, and the resin was cured to prepare a strand-like FRP reinforcing material. Load end side inner diameter 36mm, rear inner diameter 58.5mm, taper angle 2.5 °, outer diameter 75m
A fixing bracket made of SCM435 having a length of 260 m and a length of 260 mm and having a threaded portion at the rear portion of the outer diameter was prepared. Gauge length 1450
As a result of performing a tensile test in mm, the FRP reinforcement near the fixing bracket was broken at 135 tons. This is 2458 per unit area
It is about 40% higher than the strength of currently used PC steel wire. Therefore, it was confirmed that the cross-sectional area could be reduced by about 40% by using FRP reinforcement under the same design load.

[0017]

The use of the bridge prevention device of the present invention enables the design load to be exhibited for a long period of time, and has the effect of reducing the construction work because the fixing bracket is lightweight and compact. Also, since it is structurally assembled, it is effective and effective in terms of repair, maintenance and management. Further, since the supporting plate A and the supporting plate B are in contact with each other immediately before the spring comes into close contact with each other, the force can be more reliably transmitted to the connecting member.

[Brief description of the drawings]

FIG. 1 is a front view of an inter-girder connecting type bridge prevention device according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

3A is a longitudinal sectional view of FIG. 2; FIG. 3B is a side view of FIG. 2A;

FIG. 4 is a longitudinal sectional view in the case where a support plate B27 is used in place of the washer 7 in FIG. 2 or FIG.

FIG. 5 is a conceptual diagram of a PC steel material type to which a conventional general bridge-to-girder connection type bridge prevention device is attached.

[Description of Signs] 1 FRP reinforcing material 1a Connecting member 2 Fixing bracket 3 Deflector 4 Buffer material 5 Support plate 6 Spring 7 Washer 8 Nut 8a Nut 9 Set bolt 10 Bracket 11 Digit 12 Digit 13 Elastic bearing device 14 Support plate 15 hole DESCRIPTION OF SYMBOLS 16 Substrate 17 Fixing bolt 18 1st parallel support plate 19 2nd parallel support plate 20 Bracket 21 Girder web 22 Bridge pier 23 Parallel spacing plate 24 Insertion hole 25 Screw shaft part 26 Support plate A 27 Support plate B

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hironori Gokuma 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Corporation (72) Inventor Toshikazu Takeda 2-6-Otemachi, Chiyoda-ku, Tokyo No. 3 New Nippon Steel Corporation (72) Inventor Fujinori Wakashita 1-1-3-505 Yanagibashi, Taito-ku, Tokyo (72) Inventor Shohei Mizuma 2-14-6 Nihonbashi Ningyocho, Chuo-ku, Tokyo No. Eiko Kogyo Sangyo Co., Ltd. (72) Taihei Sato, Inventor 2-14-6 Nihonbashi Ningyocho, Chuo-ku, Tokyo Eiko Kogyo Co., Ltd. (72) Inventor, Masaaki Hagiwara 1-8-2 Marunouchi, Chiyoda-ku, Tokyo No. Suzuki Metal Industry Co., Ltd. (72) Inventor Shigeo Takahashi 1-8-2 Marunouchi, Chiyoda-ku, Tokyo 1-8 Suzuki Metal Industry Co., Ltd. (72) Inventor Shozo Suga Nihonbashi, Chuo-ku, Tokyo Form-cho chome 14th No. 6 Eihagane intra-industry Co., Ltd.

Claims (7)

[Claims] 1. A single member made of a fiber reinforced plastic in which continuous fibers having a fiber tensile strength of 3920 MPa or more are impregnated with a thermosetting resin are connected to a connecting member of an anti-bridging device having a structure in which two beams are connected to each other. A connecting member for a bridge-fall prevention device, wherein a strand-like FRP reinforcing material obtained by twisting and then curing the resin is used. 2. A connecting member for a bridge-fall prevention device, wherein a carbon fiber having a fiber tensile strength of 3920 MPa or more is used as the continuous fiber according to claim 1. 3. A connecting member for a bridge prevention device, wherein the FRP reinforcing material according to claim 1 has a coating layer made of a polymer material on the outer side thereof, and this is used as a connecting member. 4. A taper having an angle of 2 ° to 10 ° with respect to the longitudinal direction of the metal fitting so that the inner diameter of the fixing metal is larger than the outer diameter of the FRP reinforcing member and the inner diameter of the metal fitting increases toward the end of the bridge prevention device. A FRP reinforcing material whose end is untwisted by a length corresponding to the length of the fitting is inserted into a connecting fitting having a shape, a fitting outer diameter parallel to the longitudinal direction, and threading, and a gap between the fitting inner diameter is filled. Claim 1 characterized by being filled with
The fixing method of a connecting member for a bridge prevention device according to claim 2 or 3. 5. A bridge-fall prevention device comprising the FRP reinforcing material according to claim 1, 2 or 3 as a connecting member. 6. The fixing member according to claim 1, wherein the FRP reinforcing member according to claim 1, 2 or 3 is used as a connecting member. In order, the cushioning material 4, the supporting plate 5, the spring 6, the washer 7, and the nut 8 are arranged, and have a convex curved surface having a curvature of 80 times or more the diameter of the FRP reinforcing member from the end of the bridge prevention device toward the inside. The split bridge prevention device is characterized in that the split deflecting device is disposed at a position at least 0.5 times the outer diameter of the fixing bracket from an end of the fixing bracket inside the bridge prevention device. 7. The fixing method according to claim 4, wherein the FRP reinforcing material according to claim 1, 2 or 3 is used as a connecting member, and the fixing method according to claim 4 is applied to both ends. Material 4, support plate A26, spring 6, support plate B
27, a nut 8 is arranged, and a split deflecting tool having a convex curved surface having a radius of curvature of 30 times or more the radius of the FRP reinforcing member is fixed inward from the end of the bridge prevention device. A fall prevention device, which is located at least 0.5 times the outer diameter of the fixing bracket from the end of the bracket.