JPS5851082B2 - Bridge vibration isolation structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a bridge vibration isolation structure.

The vibrations and noise of iron bridges are caused by the fact that the main sleepers are installed directly on the upper plate of the bridge, so the wooden sleepers hit the upper plate when a train passes, causing the entire bridge to vibrate.

The present invention has been proposed to improve this phenomenon, and includes a layer of steel plate attached to the back surface of the horizontal piece in the notch cut out on the bottom surface of the wooden sleeper that comes into contact with the upper plate of the bridge. A groove-shaped vibration isolating pad is fitted, and both sides of the vibration isolating pad are sandwiched between both edges of the upper plate and both sides of the notch, and the steel plate is crimped to the top surface of the notch. The present invention relates to a bridge vibration isolation structure characterized by:

In the present invention, a groove-shaped anti-vibration pad with a steel plate layered on the back of the horizontal piece is used, and the pad is fitted into a notch cut out in the bottom of a wooden sleeper that comes into contact with the upper plate of the bridge. The horizontal part of the vibration isolating pad is sandwiched between the top surface of the notch and the upper plate so that the steel plate layered on the same part is pressed against the top surface of the notch, and fixed to the main sleeper. As a result, the vibration isolating pad is firmly attached to the wooden sleepers, and the wooden sleepers are elastically supported in the vertical direction on the upper plate.

Furthermore, since both side pieces of the vibration isolating pad are sandwiched between both side edges of the upper plate and both sides of the notch of the main sleeper, the water sleeper is elastically supported in the lateral direction as well as in the lateral direction. movement of the material is prevented.

As described above, according to the present invention, since the main sleeper is elastically supported by the upper plate of the bridge in both the vertical and lateral directions, an excellent vibration-proofing effect is exhibited, and thus the main sleeper is supported elastically in both the vertical and lateral directions. According to the invention, vibration and noise generation in a bridge can be prevented.

There is no problem if the top surface of the upper plate of an all-welded bridge is smooth, but in the case of a rivet-welded bridge, the rivet heads protrude from the top surface of the upper plate, so the anti-vibration pad must avoid this.

The present invention provides grooves that are equally spaced between the centers of the rivet heads and wider than the rivet heads between both sides of the vibration isolating pad. It is characterized by being able to fit into the bottom notch of the sleeper.

The present invention is further characterized in that a partition wall orthogonal to each of the grooves is connected between the both sides, so that when the vibration isolating pad attempts to move in the rail direction, the rivet head hits the partition wall. This prevents the vibration isolating pad from moving.

The present invention will be described below with reference to the illustrated embodiments.

1 is a wooden sleeper that comes into contact with the upper plate 2 of the bridge,
A notch 3 into which a vibration-proofing pad, which will be described later, is fitted is cut out on the bottom surface.

Reference numeral 4 denotes a vibration-proofing pad made of rubber, which is formed in a groove shape with side pieces 4b and 4b vertically disposed on both sides of a horizontal piece 4a.

Concave grooves 4c are provided between the side pieces 4b, 4b at equal intervals to the centers of the rivet heads 5 protruding onto the upper plate 2, wider than the rivet diameter, and slightly deeper than the height of the rivet heads 5. Regardless of the irregularity of the position of the rivet head 5, when the anti-vibration pad 4 is fitted into the notch 2 of the wooden sleeper 1, the rivet head 5 fits into the groove 4c, and thus the anti-vibration pad 4 It comes into contact with the upper plate 2.

Further, the distance W4d perpendicular to each of the grooves 4c is the width of the both side pieces 4c.
, 4c, and when the anti-vibration pad 4 attempts to move in the direction of the rail R, the rivet head 5 collides with the partition wall 4d to prevent the anti-vibration pad 4 from moving.

Further, a large number of grooves 4e perpendicular to the longitudinal direction are cut out in the protrusions interposed between the grooves 4c and between each groove 4c and the side pieces 4b, and the vibration isolating pad 4 The spring constant is reduced.

4f in the figure is an insertion hole for a coach screw 6, which is provided in the center of a partition wall 4d of the vibration isolating pad 4 and fixes the pad 4 to the main sleeper 1.

A steel plate 1 is layered on the bottom surface of the horizontal piece 4a of the vibration isolating pad 4 and fitted into the notch 3 of the main sleeper 1, and the steel plate 7 is brought into contact with the top surface of the notch 3, and both side pieces 4b, 4b
is brought into contact with the side surface of the notch 3, the vibration isolating pad 4 is fixed to the wooden sleeper 1 by the coach screw 6 inserted through the insertion hole 4f and the through hole of the steel plate 7, and the open sleeper 1 is attached to the upper plate. 2, and the vibration isolating rubber 4 is clamped between the main sleeper 1 and the upper plate 2, and the both side pieces 4b of the vibration isolating rubber 4 are placed on both sides of the upper plate 1 and the notch 3. It is attached between the neck on both sides.

At this time, the rivet heads 5 protruding onto the upper plate 1 fit into the grooves 4c of the vibration isolating pad 4.

The wooden sleeper 1 is fixed to the upper plate 1 via a hook bolt 8, and a coil spring 10 is installed between the tightening nut 9 of the hook bolt 8 and the upper surface of the wooden sleeper 1.
is interposed.

Since the present invention is constructed as described above, the wooden sleeper 1 is made elastic in the vertical direction by the vibration isolating rubber 4 interposed between the top surface of the upper plate 2 and the top hole of the notch 3 of the wooden sleeper 1. In addition to being supported, the wooden sleeper 1 is also elastically supported in the lateral direction by the anti-vibration rubber 40 side pieces 4b, 4b interposed between both side surfaces of the notch 3 and both side edges of the upper plate 2, This not only provides a vibration-proofing effect for the bridge, but also prevents the wooden sleepers 1 from moving in the lateral direction.

Note that the vibration-proofing effect is greater as the spring constant of the vibration-proofing pad 4 is lower, so if the vibration-proofing pad 4 has a sufficient vibration-proofing effect, the vertical displacement of the wooden sleeper 1 when a train passes is large. A normal hook bolt cannot follow this displacement and loosens, but in the illustrated example, a coil spring 10 with a small spring constant is installed between the tightening nut 9 of the hook bolt 8 and the top surface of the main sleeper 1. Since the hook bolt 8 is interposed, loosening of the hook bolt 8 is prevented.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a bridge vibration isolation structure according to the present invention, and FIG. 2 is a slope view of a vibration isolation pad. 1... Wooden sleepers, 2... Upper plate, 3...
・Notch, 4... Anti-vibration pad, 4a... Horizontal piece, 4
b...Side piece, 4c...Concave groove, 4d...Partition wall, 5
...Steel plate.

Claims (1)

[Claims] 1. A groove-shaped anti-vibration pad made of a steel plate layered on the back side of the horizontal piece is fitted into a notch cut out on the bottom of the main sleeper that comes into contact with the upper plate of the bridge, A bridge vibration isolation structure characterized in that both sides of the vibration isolation pad are sandwiched between both side edges of the upper plate and both sides of the notch, and the steel plate is crimped to the top surface of the notch. 2. Fit a groove-shaped anti-vibration pad with a layer of steel plate on the back side of the horizontal piece to the notched hole in the bottom of the wooden sleeper that comes into contact with the upper plate of the bridge. Both side pieces are sandwiched between both side edges of the upper plate and both sides of the notch, and the steel plate is crimped to the top surface of the notch, so that a part of the vibration isolating pad protrudes onto the upper plate between both side pieces of the vibration isolating pad. grooves are arranged at equal intervals to the centers of the rivet heads and wider than the diameter of the rivet, and partition walls perpendicular to the respective grooves are connected between the two pieces. Bridge vibration isolation structure.