JP3451005B2 - Grating noise control - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise suppressor attached to a grating used for a side groove of a road surface or a transverse groove.

[0002]

2. Description of the Related Art It is well known to attach a noise suppressor to a grating in order to reduce the impact noise generated by the grating due to the passage of a vehicle or the like. For example, in the grating 3 as shown in FIGS. 6 and 7, the flange 7a is projected outward from the upper end of the side plate 7, and the flange 7a is placed on the U-shaped groove 2.

A rubber noise suppressor 21 is attached to the grating 3 in order to reduce noise generation. The noise preventive device 21 includes a vertical wall plate 22 and a horizontal wall plate 2.
The vertical wall plate 22 is formed into a long object having an L-shaped cross section having
The fin-shaped pieces 24, 25 having a partial arc-shaped cross section on the outer surface of the
Are vertically symmetrical.

In the noise suppressor 21, the horizontal wall plate 23 is laminated on the entire lower surface of the flange 7a, and the vertical wall plate 22 is laminated on the entire outer surface of the side plate 7 by an adhesive agent. Rivet 26 fixes several places between the upper and lower fin-shaped pieces 24 and 25 of the vertical wall plate 22.

When the grating 3 is placed on the groove 2 as shown in FIG. 7, the noise suppressor 21 includes a horizontal wall plate 23 between the upper wall 2a of the groove 2 and the flange 7a, and a vertical wall plate 22.
Is interposed between the inner wall 2b of the groove 2 and the side plate 7, and the upper and lower fin-shaped pieces 24 and 25 both bend and elastically contact the inner wall 2b of the groove 2 to allow the passage of a vehicle or the like. The impact generated between the groove 2 and the groove 2 is absorbed and relaxed, and the impact noise is reduced.

[0006]

However, since the rubber noise suppressor 21 is formed as a long product which is attached to the outer surface of the side plate 7 and the lower surface of the flange 7a over the entire length and width. In addition to the troublesome attachment, the material cost and the adhesion processing cost are high, and the rivet 26 is used for fixing, which further increases the manufacturing cost. Further, since both the upper fin-shaped piece 24 and the lower fin-shaped piece 25 are formed to have a partial arc shape in cross section to equalize the protruding amount from the vertical wall plate 22, when the grating 3 is inserted into the groove 2, 7, the upper fin-like piece 24 is bent upward as indicated by the chain double-dashed line, and the phenomenon in which the strain is increased over time due to continuous bending between the inner wall 2b of the groove 2 and the side plate 7 occurs. However, there is a problem in that it easily fatigues and breaks in a short period of time and lacks durability.

An object of the present invention is to provide a noise suppressing device for grating, which can reduce the material cost and can be easily attached to the grating. An object of the present invention is to provide a noise preventing tool for grating having excellent durability.

[0008]

In order to achieve the above object, the present invention is made of rubber or synthetic resin, which is attached to the lower end of a grating side plate which is fitted directly into the upper opening of a groove or through a receiving frame. The noise prevention device is characterized by being configured as follows. That is,
For example, as shown in FIG. 1, the noise suppressor 9 is formed by a vertical wall piece 10 that is in contact with a part of the outer surface of the side plate 7 of the grating 3 in the longitudinal direction, and is horizontally connected inward from the lower end of the vertical wall piece 10. , The bottom wall piece 11 that abuts the lower end surface of the side plate 7, and the bottom wall piece 11 that is connected obliquely upward so as to incline toward the vertical wall piece 10 from the inward end of the bottom wall piece 11 and presses elastically against the inner surface of the side plate 7. Wall piece 12 and vertical wall piece 1 on the bottom wall piece 11
0 and the pressing wall piece 12, and a fitting groove 13 which is externally fitted to the lower end portion of the side plate 7, and the vertical wall piece 10 upwardly from a part of the outer surface of the vertical wall piece 10 in the vertical direction. The inner wall 2b of the groove 2 or the receiving frame 20 is provided so as to project over the entire length in the lateral direction.
(Refer to FIG. 5) The lower fin-shaped piece 1 bent in a curved shape and elastically contacting in a surface contact state has a partially arcuate shape with a downward convex cross section.
4 and the upper part projecting outward from the upper part of the lower fin-shaped piece 14 on the outer surface of the vertical wall piece 10 with a protruding amount c smaller than the protruding amount b of the lower fin-shaped piece 14 from the vertical wall piece 10. Protrusion 1
5 and.

The grating 3 is provided with a main bar 5 orthogonal to the side plate 7, and the pressing wall piece 12 is provided with a notch 16 which engages with the lower end of the main bar 5 in the vertical direction.

[0010]

With respect to the grating 3, the fitting groove 13 formed between the vertical wall piece 10 and the pressing wall piece 12 on the bottom wall piece 11 is formed.
Is press-fitted into the lower end portion of the side plate 7 from below to resist the elasticity of the pressing wall piece 12, so that it is attached to the lower side of the side plate 7 in a retaining state.
This attachment can be performed easily and efficiently as compared with the operation of using the adhesive and the rivet as in the above-described conventional noise suppressor.

An upper protruding piece 1 formed on the outer surface of the vertical wall piece 10.
5 and the lower fin-shaped piece 14, since the lower fin-shaped piece 14 is formed in a partially arcuate shape of a downward convex shape, when the grating 3 is fitted in the groove 2, the lower fin-shaped piece 14 forms the inner wall 2b of the groove 2. Alternatively, it is pushed and bent while slidingly contacting the receiving frame 20, and elastically comes into surface contact with the inner wall 2b or the receiving frame 20. On the other hand, the upper projecting piece 15 is protruded by less than the protruding amount of the lower fin-shaped piece 14 from the vertical wall piece 10, and the tip end thereof is formed into the groove 2.
It is set so as to hit the inner wall 2b or the receiving frame 20. Therefore, the upper projecting piece 15 exerts a tensioning action in the gap between the inner wall 2b of the groove 2 or the receiving frame 20 and the side plate 7 to maintain the space of the gap, so that the lower fin-shaped piece 14 does not age. To suppress the increase in strain.
The lower fin-shaped piece 14, the upper protruding piece 15 and the vertical wall piece 1
By 0, the impact generated between the inner wall 2b of the groove 2 or the receiving frame 20 and the grating 3 is absorbed and relaxed.

The noise preventive tool 9 is formed in a size such that the vertical wall piece 10 abuts a part of the outer surface of the side plate 7 of the grating 3 in the longitudinal direction, that is, a short piece (piece). The material cost can be reduced as compared with a long object that abuts over the entire length of the side plate 7 of the grating 3 in the longitudinal direction like the noise suppressor. The pressing wall piece 12 elastically contacting the inner surface of the side plate 7 and the bottom wall piece 11 contacting the lower end surface of the side plate 7 are the vertical wall piece 10,
Since the lower fin-shaped piece 14 and the upper projecting piece 15 are integrally formed of rubber or synthetic resin, the side plate 7
Even when zinc is plated, the pressing wall piece 12 and the bottom wall piece 11 do not scrape off the zinc plating of the side plate 7, and therefore the rust of the side plate 7 due to the peeling of the plating can be prevented.

[0013]

1 to 4 show an example of use of the present invention. The noise suppressor 9 according to this embodiment is mounted with the steel grating 3 used in the U-shaped groove 2 as shown in FIG.

As shown in FIG. 1 and FIG. 2, the grating 3 has a plurality of I-shaped steel main bars 5 extending in the groove width direction and arranged in parallel at regular intervals, and the upper ends of the main bars 5. From a cross bar 6 composed of a plurality of twist bars that are pressure welded to the side and extend in the front-rear direction (longitudinal direction of the groove) orthogonal to the main bar 5, and a pair of angle side plates 7 fixed to the left and right ends of the main bar 5. Become. In this embodiment, each side plate 7
A flange 7a is formed so as to project outward at the upper end of the.

The lateral width W of the grating 3 is set to be smaller than the groove width A of the groove 2 by about 10 mm. For example, when the groove width A of the groove 2 is 150 mm, the lateral width W of the grating 3 is 140 mm. Therefore, as shown in FIG. 1, the grating 3 can be easily mounted by dropping it into the groove 2 so that the flanges 7a, 7a rest on the upper walls 2a, 2a of the groove 2,
By this mounting, a gap g of about 5 mm is formed between the inner wall 2b of the groove 2 and the side plate 7 of the grating 3.

Noise preventives 9 are attached to the front and rear of the lower ends of the side plates 7 of the grating 3, respectively.
As shown in FIGS. 3 and 4, the noise suppressor 9 is a short object made of rubber or a synthetic resin material in an inverted 7-shaped cross section, and has a flat plate-shaped vertical wall piece 10 and a vertical wall piece 10. Bottom wall piece 11 that is horizontally provided inwardly from the lower end of the bottom wall piece, pressing wall piece 12 that is provided obliquely upwardly from the inward end of the bottom wall piece 11 so as to incline toward the vertical wall piece 10, and the bottom wall A fitting groove 13 formed between the vertical wall piece 10 on the piece 11 and the pressing wall piece 12,
The vertical wall piece 10 extends upward from a part of the outer surface of the vertical wall piece 10 in the vertical direction.
Of the lower fin-shaped piece 14 having a partially arcuate shape with a downwardly convex cross-sectional shape and projecting over the entire length of the vertical wall piece 1.
The outer fin 0 is projected outward from the upper part of the lower fin-shaped piece 14 in parallel with the lower fin-shaped piece 14 with a protrusion amount c smaller than the protrusion amount b of the lower fin-shaped piece 14 from the vertical wall piece 10. It consists of the upper protrusion 15.

However, the groove width a at the upper end of the fitting groove 13, that is, the distance between the upper end of the pressing wall piece 12 and the vertical wall piece 10 is set smaller than the thickness t of the side plate 7 (see FIG. 1). To do. The protrusion amount b of the lower fin-shaped piece 14 from the vertical wall piece 10 is set to be larger than the gap g between the inner wall 2b of the groove 2 and the side plate 7. The amount of protrusion c of the upper protrusion 15 from the vertical wall piece 10 is set to be the same as or slightly longer than the gap g by adding the thickness of the vertical wall piece 10 to the amount of protrusion c. The longitudinal length d of the grating 3 (see FIG. 2) is
For example, when it is 995 mm, the length e in the longitudinal direction of the vertical wall piece 10 (see FIG. 2) is about 60 mm. In addition, the pressing wall piece 1
As shown in FIG. 4, two notch grooves 16 are provided in the front and rear in the vertical direction in the No. 2. Two vertical projections 17 are provided on the vertical wall piece 10 in the fitting groove 13 in the longitudinal direction of the vertical wall piece 10.

The noise preventing tool 9 thus constructed is mounted in front of and behind the lower end of each side plate 7 of the grating 3 before being mounted in the groove 2. At this time, in the noise suppressor 9, the entire inner surface of the vertical wall piece 10 abuts a part of the outer surface of the side plate 7, the bottom wall piece 11 abuts the lower end surface of the side plate 7, and the cut groove 16 is formed. Until the lower end of the main bar 5 is engaged, the fitting groove 13 is press-fitted into the lower end of the side plate 7 from below, against the elasticity of the pressing wall piece 12. Then, the pressing wall piece 12 elastically contacts the inner surface of the side plate 7, whereby a state in which the side plate 7 is strongly sandwiched between the pressing wall piece 12 and the vertical wall piece 10 is obtained. The side plate 7 is attached so that it does not slip out or slide down. The slip-out prevention and slip-off prevention effects are further enhanced by the engagement of the cut groove 16 of the pressing wall piece 12 with the lower end of the main bar 5. Vertical wall piece 1
The ridges 17 of 0 make elastic contact with the outer surface of the side plate 7 in a line contact state to increase the anti-slip function, so that the noise suppressor 9 can be more effectively prevented from sliding down from the side plate 7.

Thus, in the grating 3 provided with the noise preventive 9, the flanges 7a, 7a have the grooves 2 as shown in FIG.
It is fitted into the groove 2 so as to be placed on the upper walls 2a and 2a.
Then, the lower fin-shaped piece 14 of the noise suppressor 9 is bent and deformed while being pushed by the inner wall 2b of the groove 2 and elastically contacts the inner wall 2b in a surface contact state, and the tip of the upper projecting piece 15 contacts the inner wall 2b. Since it abuts, the impact generated between the inner wall 2b of the groove 2 and the side plate 7 due to the passage of a vehicle or the like is absorbed and mitigated by the vertical wall piece 10 and the lower fin-shaped piece 14, and the impact noise can be reduced. In addition, the upper protrusion 15 is the inner wall 2
b against the inner wall 2b to such an extent that the gap between the side plate 7 and the side plate 7 is held, and this tensioning action causes the lower fin-shaped piece 1
4 suppresses the strain from increasing with time, so that the lower fin-shaped piece 14 can be prevented from breaking in a short period of time. In addition,
Instead of being formed continuously over the entire length of the vertical wall piece 10 in the longitudinal direction, the upper projecting pieces 15 may be formed by arranging a plurality of pieces intermittently in the longitudinal direction of the vertical wall piece 10.

FIG. 5 shows a second use example of the present invention. In this usage example, the basic structure of the grating 3 and the noise suppressor 9 are the same as those in the above usage example, but the groove 2
The receiving frame 20.20 having an L-shaped cross section and having a horizontal wall 20a and a vertical wall 20b is installed in the opening of the receiving frame 20.20.
The difference is that the grating 3 is placed on the horizontal walls 20a, 20a of the above. Therefore, the side plate 7 of the grating 3 is formed in a shape having no flange 7a. And the grating 3 is the receiving frame 20/20
When placed on top, the lower fin 14 of the noise suppressor 9
Is pushed by the vertical wall 20b of the receiving frame 20 to be bent and deformed to make elastic contact with the vertical wall 20b in a surface contact state, and at the same time, the tip of the upper projection 15 abuts on the vertical wall 20b. As a result, an impact generated by the grating 3 and the receiving frame 20 colliding with each other during the passage of a vehicle or the like is applied to the vertical wall piece 10 and the lower fin-shaped piece 1.
4 and the upper projecting piece 15 absorb and relax the metal impact sound. Other configurations and operational effects are similar to those of the above-described use example.

[0021]

As described above, according to the present invention, the noise preventive tool 9 has the fitting groove 13 formed between the vertical wall piece 10 on the bottom wall piece 11 and the pressing wall piece 12. The fitting groove 13 is formed on the lower end portion of the side plate 7 of the grating 3 to press the pressing wall piece 1.
By press-fitting and fitting against the elasticity of No. 2, it is possible to easily and efficiently attach the side plate 7 so that it does not come out downward.

When the grating 3 is attached to the groove 2, the lower fin-shaped piece 14 formed on the outer surface of the vertical wall piece 10 is pressed by the inner wall 2b of the groove 2 or the receiving frame 20 and bent to the inner wall 2b or the receiving frame 20. The tip of the upper projecting piece 15 abuts the inner wall 2b or the receiving frame 20 while making elastic contact with the surface contact state. Therefore, the grating 3 and the groove 2 are formed by the passage of a vehicle or the like.
Or the impact generated by the collision with the receiving frame 20,
The vertical wall piece 10, the lower fin-shaped piece 14 and the upper projecting piece 15 absorb and relax the absorption, and the impact noise can be reduced. Moreover, the upper protrusion 15
Has a tensioning action on the inner wall 2b of the groove 2 or the receiving frame 20, so that the strain increase of the lower fin-shaped piece 14 with time can be suppressed, and the durability can be improved. Moreover, since the noise suppressing device is formed in a short length, the material cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a noise suppressor of a usage example is attached to a grating.

FIG. 2 is a perspective view showing the grating and the noise suppressor of FIG. 1 in a separated state.

FIG. 3 is a perspective view of the noise suppressor of FIG. 1 viewed from the outer surface side.

FIG. 4 is a perspective view of the noise suppressor shown in FIG. 1 viewed from the inner surface side.

FIG. 5 is a front view showing a state in which the noise suppressor of the second usage example is attached to the grating.

FIG. 6 is a perspective view showing a conventional noise suppressor attached to a grating.

FIG. 7 is a front view of the grating and noise suppressor of FIG.

[Explanation of symbols]

2 grooves 3 Grating 5 Main bar 7 Side plate 9 Noise control equipment 10 Vertical wall pieces 11 Bottom wall piece 12 Pressing wall piece 13 Mating groove 14 Lower fin 15 Upper protrusion 16 notch 20 frames

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Claims (2)

(57) [Claims] 1. The receiving frame 20 directly or in the upper opening of the groove 2.
A noise prevention tool made of rubber or synthetic resin, which is attached to the lower end of the side plate 7 of the grating 3 fitted via the vertical wall piece 10 abutting on a part of the outer surface of the side plate 7 in the longitudinal direction, The bottom wall piece 11 is arranged horizontally inwardly from the lower end of the vertical wall piece 10 and contacts the lower end surface of the side plate 7, and the bottom wall piece 11 is inclined from the inward end of the bottom wall piece 11 toward the vertical wall piece 10. The lower end of the side plate 7 is formed between the vertical wall piece 10 on the bottom wall piece 11 and the pressing wall piece 12 that is continuously provided upward and elastically contacts the inner surface of the side plate 7, and between the vertical wall piece 10 and the pressing wall piece 12 on the bottom wall piece 11. The fitting groove 13 to be fitted onto the vertical wall piece 10 and the vertical wall piece 10 upward from a part in the vertical direction of the outer surface of the vertical wall piece 10.
Of the lower fin-shaped piece 1 having a partially arcuate shape with a downwardly convex cross-sectional shape, which is projected over the entire lateral length of the
4 and the upper part projecting outward from the upper portion of the lower fin-shaped piece 14 on the outer surface of the vertical wall piece 10 with a protruding amount c smaller than the protruding amount b of the lower fin-shaped piece 14 from the vertical wall piece 10. A noise preventing tool for grating having a protrusion 15. 2. The grating 3 is provided with a main bar 5 which is orthogonal to the side plate 7, and the pressing wall piece 12 is provided with a cut groove 16 which engages with the lower end of the main bar 5 in the longitudinal direction. 1. A noise prevention device for grating according to 1.