JP3218785U - Bridge damping box girder - Google Patents

Abstract

A bridge damping box girder capable of easily imparting excellent damping performance to an existing bridge box girder is provided.
A damping panel 10 made of a three-dimensional mesh assembly is fixed to the inner surface of a steel plate 3 of a box girder 2 that supports a vehicle traveling path. The three-dimensional network aggregate is formed by bending a large number of continuous fibers in a random loop shape and fusing each other. It is preferable to add inorganic fine powder to the fiber as a filler. Further, in order to fix the vibration control panel to the steel plate, it is preferable to use a stud bolt. The stud bolt stands upright from a flat plate-like base, the base is fixed to the steel plate, the stud bolt is inserted into the vibration damping panel, and a nut is screwed from above to fix the vibration damping panel to the steel plate.
[Selection] Figure 2

Description

  The present invention relates to a box girder for a bridge such as a Shinkansen or a highway, particularly a box girder excellent in vibration control.

  Noise and vibration generated on the Shinkansen and expressways have been a major problem for some time. There are various causes for the generation of these noises and vibrations, but vibrations are transmitted directly from the roadway to the bridge girder that supports the vehicle's roadway. The effect of preventing noise and vibration is great. Thus, for example, Patent Document 1 describes that a vehicle traveling path is supported by a soundproof upper road composite girder. The upper composite girder forms a box girder by a steel plate having a rubber latex mortar layer formed on one side or both sides. This rubber latex mortar is made of mortar mixed with styrene butadiene rubber (SBR) and is applied by a spraying method. However, uniformly forming a relatively thick rubber latex mortar layer having a thickness of 10 mm or more on a box girder by a spraying method requires a lot of labor and time, and has a problem that the work efficiency is very poor and the cost is high. . Furthermore, it is difficult to construct the existing box girder, and in particular, it is almost impossible to construct the inner side of the box girder.

JP 2010-47895 A

  Therefore, the problem of this device is to make it possible to impart high vibration damping to existing box girders.

  In order to solve the above-described problems, in the present invention, a damping panel made of a three-dimensional network assembly is fixed to the steel plate surface of a box girder that supports the vehicle traveling path. A sound absorbing plate can be laminated on this panel. The panel may be covered with a sheet. This three-dimensional network aggregate is formed by bending a large number of continuous fibers in a random loop shape and fusing each other. It is preferable to add inorganic fine powder as a filler to the fiber.

  In order to fix the vibration control panel to the steel plate, a stud bolt is preferably used. This stud bolt stands upright from a flat plate-like base, this base is fixed to the steel plate, a stud bolt is inserted into the vibration damping panel, and a nut is screw-engaged from above to attach the vibration damping panel to the steel plate. Stick. Alternatively, the damping plate may be inserted into the stud bolt and the nut may be screw-engaged from the stud bolt to press the damping panel with the pressing plate and be fixed to the steel plate. Furthermore, you may adhere to a steel plate by arrange | positioning a damping panel near a stud bolt, and pressing a part of surface of a damping panel with a pressing plate.

  According to this device, as described above, since the vibration damping panel made of a solid network aggregate is fixed to the surface of the box girder steel plate, the vibration damping panel made of continuous fibers can attenuate the vibration of the box girder. it can. Moreover, since it can construct by sticking a plate-shaped damping panel to a box girder, it can be easily applied to an existing box girder.

Perspective view of the bridge, Cross-sectional view of a box girder that supports the vehicle travel path, (A), (B), (C) is a partial perspective view of the vibration control panel, Cross-sectional view showing another example of the vibration control panel, An exploded perspective view showing a mounting device of the vibration control panel, A longitudinal cross-sectional view showing the mounting state of the vibration control panel using the mounting tool, The perspective view which shows the pressing member of a damping panel, A longitudinal sectional view showing a state in which the damping panel is fixed by the presser member; The perspective view which shows the presser plate of a damping panel, (A) is a longitudinal sectional view showing the use state of the presser plate, (B) is the same plan view, (A) is the top view which has arrange | positioned the damping panel in the side plate of a box girder, (B) is the top view which has arrange | positioned the damping panel in the end plate of a box girder.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a vehicle traveling path 1 made of a concrete slab or the like is supported by a box girder 2. The box girder 2 is formed by assembling a steel plate 3 into a quadrangular cross section and is bridged between bridge piers (not shown) so that the traveling path 1 is placed on the upper surface of the box girder 2.

  As shown in FIG. 2, a damping panel 10 is attached to the inner surface of the steel plate 3 that forms the box girder 2. The damping panel 10 is preferably provided on the entire inner surface of the box girder 2, but may be provided partially. Although not shown, it can be provided on the outer surface. As shown in FIG. 3A, this vibration control panel 10 is a three-dimensional network assembly in which a large number of continuous fibers are three-dimensionally bent in a random loop shape and fused together so as to support the loop state. It consists of a body 11. The three-dimensional network assembly 11 is formed as follows. First, the molten thermoplastic resin is discharged downward from a plurality of orifices by a melt extruder. Below this is a medium bath such as water, and in this medium bath, a pair of conveyors whose conveying surfaces are opposed are arranged in the vertical direction, and when the molten resin fibers discharged from the orifice reach the medium bath, Due to the buoyancy of the bath, this fiber is bent in a three-dimensional direction at random in a loop. At the same time, the fibers bent in the three-dimensional direction come into contact with each other and are fused to move in the moving direction of the conveyor, and are cooled and solidified to form a three-dimensional network aggregate having substantially the same thickness as the distance between the pair of conveyors. Thus, the molten resin fiber discharged from one orifice is continuous from the start end to the end in the fiber flow direction. Accordingly, the panel 10 obtained by subdividing the formed three-dimensional network aggregate original fabric also has most of the fibers continuous from one end to the start end in the flow direction of the original fabric fibers.

The fiber material forming the three-dimensional network aggregate 11 is a thermoplastic resin such as polyethylene, polypropylene, polyester, polyamide, polyvinyl chloride, polystyrene, or the like. Moreover, a polymer alloy may be sufficient. Appropriate additives can be added to these resins. In particular, in order to enhance the mass effect, it is preferable to add inorganic fine powders such as metal, glass and stone as fillers. The cross-sectional shape of the fiber may be circular, elliptical, polygonal or other irregular shapes, or may be hollow. The fineness of the fiber is preferably about 1000 to 50000 denier. The apparent density of the three-dimensional network assembly 11 is preferably about 0.03 to 0.30 g / cm ³ . The thickness is about 10 mm to 80 mm.

  As shown in FIG. 3B, the panel 10 may have an outer surface appropriately coated with a sheet. For example, the sheet 12a may be attached to the front surface, or the front and back surfaces may be attached between the sheets 12a and 12b. Further, the side surface can be covered with a sheet. Further, as shown in FIG. 3C, the whole may be covered with a bag 12 c that can store the three-dimensional network assembly 11. The material of these sheets 12a, 12b and bag 12c can be a single body or a laminate such as a woven fabric, a knitted fabric, a nonwoven fabric, or a synthetic resin film.

  As shown in FIG. 4, the panel 10 may be a laminate of a three-dimensional network assembly 11 and a sound absorbing plate 11a. As the material of the sound absorbing plate 11a, an aggregate of fibers such as foamed resin such as urethane foam, polyethylene foam, and polypropylene, nonwoven fabric, and hard cotton is preferable. Needless to say, the laminated body can be covered with sheets 12a, 12b, bags 12c, and the like, as in FIGS. 3B and 3C described above.

The size of the panel 10 ^is a 100cm ² ~50000cm 2 mm, the shape may have square, it is preferable cut to shape in accordance with the location where to apply as necessary during construction. There are various methods for attaching the panel 10 to the box girder 2. For example, there is a method of sticking to the steel plate 3 using an adhesive or a double-sided adhesive tape. Since this method alone is insufficient in durability, several fixing methods using a fixture will be described below. As shown in FIG. 5, the fixture 20 includes a stud bolt 22 fixed at a substantially right angle to a flat plate-like base 21, and a nut 23 that engages with the male screw of the stud bolt 22. The base 21 of the fixture 20 is fixed to the steel plate 3 as shown in FIG. As a fixing method, an adhesive is generally used. The stud bolt 22 of the fixed base 21 is inserted into the panel 10 and the nut 23 is tightened to fix the panel 10 to the steel plate 3. At this time, you may adhere | attach the back surface of the panel 10 to the steel plate 3 using an adhesive agent or a double-sided adhesive tape. Of course, the panel 10 is not limited to the three-dimensional network assembly 11 shown in FIG. 3A, but is covered with the sheets 12a and 12b shown in FIGS. Can be used.

  The panel 10 may be fixed using a pressing member 30 as shown in FIG. As shown in the figure, the presser member 30 is composed of an elongated presser plate 31 and end plates 32 and 32 bent at both ends at substantially right angles. The presser plate 31 has insertion holes 33 and 33 for the stud bolt 22. Is provided. As shown in FIG. 8, the pressing member 30 is attached to the upper surface and the side surface of the panel 10, and the stud bolts 22 and 22 of the fixtures 20 and 20 fixed to the steel plate 3 in advance are passed through the panel 10 and the insertion holes 33 and 33. The nuts 23 and 23 are tightened to fix the panel 10. At this time, as shown in the drawing, the lengths of the end plates 33 and 33 are set in advance so that the end surfaces of the end plates 32 and 32 protruding downward from the presser plate 31 at right angles do not hit the steel plate 3. As described above, a panel 10 as shown in FIGS. 3B and 3C can be used. Also, a plurality of panels 10 can be fixed simultaneously.

  Furthermore, a presser plate 40 as shown in FIG. 9 can be used. This presser plate 40 is formed by bending the four corners of a quadrangular plate body to form a locking claw 41 and a bolt insertion hole 42 at the center. FIG. 10 shows a state in which the panel 10 is fixed to the steel plate 3 using the presser plate 40. First, the base 21 of the fixture 20 (FIG. 5) is fixed to the steel plate 3 of the box girder 2 with an adhesive. With the stud bolts 22 standing upright from the base 21 as the center, as shown in FIG. 10B, the corners of the four panels 10 are butted together, the presser plate 40 is inserted into the stud bolts 22 and the washers 24 are interposed. Then, the nuts 23 are screwed together and tightened so that the locking claws 41 of the presser plate 40 are not inserted into the upper surfaces of the respective panels 10. In addition, it is preferable to join the back surface of the panel 10 to the steel plate 3 with the double-sided adhesive tape T or an adhesive.

  FIG. 11 shows an example of a layout diagram in which the panel 10 is attached to the inner surface of the steel plate 3 of the box girder 2. FIG. 11 (A) shows the side plate 4 of the box girder 2, and FIG. 11 (B) shows the end plate 5. Reference numerals 4a and 5a denote doorways. As shown in the figure, the standard shape of the panel 10 is a square, and the portion that is adjacent to the rib 4b of the side plate 4 is formed by cutting and shaping the standard panel 10 as indicated by reference numerals 10a, 10b, and 10c. It has been. In addition, the panel 10 is shaped around the entrance / exit 4a according to the curve of the entrance / exit 4a. Similarly, in the end plate 5 of FIG. 11 (B), the shaped panel 10 is used in the vicinity of the peripheral edge, the peripheral edge of the entrance / exit 5a, and the rib 5b.

  Although the fixture 20, the pressing member 30, and the pressing plate 40 are not shown in the panel layout diagram of FIG. 11, the panel 10 can be fixed to the box girder 2 by using them. The panel 10 can be fixed not only to the inner surface of the box girder 2 but also to the outer surface.

DESCRIPTION OF SYMBOLS 1 Vehicle traveling path 2 Box girder 3 Steel plate 4 Side plate 4a Entrance / exit 4b Rib 5 End plate 5a Entrance / exit 5b Rib 10, 10a, 10b, 10c Damping panel 11 Three-dimensional network aggregate 11a Sound-absorbing plate 12a, 12b Sheet 12c Bag 20 Fixture 21 Base 22 Stud bolt 23 Nut 30 Presser member 31 Presser plate 32 End plate 33 Insertion hole 40 Presser plate 41 Locking claw 42 Insertion hole T Double-sided adhesive tape

Claims (8)

  A bridge damping box girder made of a steel plate supporting a vehicle traveling path, wherein a damping panel made of a solid network aggregate is fixed to the steel plate.   The bridge damping box girder according to claim 1, wherein the damping panel comprises a laminate of a three-dimensional network assembly and a sound absorbing plate.   The bridge damping box girder according to claim 1 or 2, wherein an outer surface of the damping panel is covered with a sheet.   4. The bridge damping box girder according to claim 1, wherein the three-dimensional network aggregate is formed by bending a plurality of continuous fibers in a random loop shape and fusing each other.   The bridge damping box girder according to claim 4, wherein inorganic fine powder is added to the fiber as a filler.   A flat plate-like base having upright stud bolts is fixed to the steel plate, and the damping panel is fixed to the steel plate by a nut inserted into the vibration control panel and screwed to the stud bolt. The bridge damping box girder according to any one of claims 1 to 5.   The bridge damping box girder according to claim 6, wherein a nut is screw-engaged with the stud bolt via a pressing plate, and the pressing plate presses the surface of the damping panel.   A flat plate-like base having an upright stud bolt is fixed to the steel plate, a nut is screw-engaged via a press plate inserted through the stud bolt, and a vibration damping disposed near the stud bolt. The bridge damping box girder according to any one of claims 1 to 5, wherein the damping panel is fixed to the steel plate by pressing the surface of the panel with the pressing plate.

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