JP6365048B2 - Sound barrier insulation for sound barrier - Google Patents

Description

  The present invention relates to a leaf spring type sound insulation plate fastener for elastically fixing a sound insulation plate in a sound insulation wall.

In general, soundproof walls provided on both sides of an automobile road are formed on a plurality of support columns erected at a predetermined interval and opposed surfaces of a pair of adjacent columns, and extend in the length direction of the columns. A U-shaped groove, and a sound insulating plate fitted between the opposed U-shaped grooves and set to have a thickness smaller than the groove width of the U-shaped groove.
A leaf spring type sound insulating plate fastener is attached to a gap between the sound insulating plate and one side surface of the U-shaped groove in cross section, and the sound insulating plate is attached to the other side of the U-shaped groove in cross section by the elastic restoring force of the fastener. It is pressed and fixed to the side surface. (Patent Document 1)

  The fastener shown in Patent Document 1 extends substantially in the vertical direction, and when mounted in the gap, the first vertical side in which one surface in the thickness direction contacts the surface on the gap side in the thickness direction of the sound insulating plate When the fastener is attached to the gap, the horizontal distance between the first portion and the first vertical side portion is increased so that the horizontal distance between the first vertical side portion and the first vertical side portion increases. An upper end portion on the opposite side surface to the first vertical side portion includes a second vertical side portion that abuts on one side surface of the U-shaped groove. Between the first vertical side and the second vertical side, a first horizontal side connected to the upper end of the second vertical side and extending from the upper end toward the first vertical side. A second horizontal side portion connected to the first vertical side portion side end portion of the first horizontal side portion and extending from the end portion toward the second vertical side portion side and downward. A second horizontal side portion connected to the second vertical side portion end portion of the two horizontal side portions, and a third horizontal side portion extending from the end portion toward the first vertical side portion side and upward, and the first horizontal side portion; The connecting portion with the second horizontal side portion is formed so as to contact the inner surface of the first vertical side portion, and the connecting portion between the second horizontal side portion and the third horizontal side portion is in contact with the inner surface of the second vertical side portion. It is formed to slide. In the fastener of Patent Document 1, the horizontal distance between the lower ends of the first vertical side and the second vertical side is set to be smaller than the gap, while the horizontal distance between the upper ends is the gap. The lower end of the first vertical side and the second vertical side of the fastener is inserted into the gap, and the first vertical side is struck with a hammer or the like from above. And the upper end of the second vertical side are bent toward each other and inserted into the gap between the sound insulating plate and the U-shaped groove in cross section.

  In the clasp of the above-mentioned patent document 1, when it is inserted into the gap between the groove portion of the column of the soundproof wall and the edge portion of the sound insulation plate, the upper ends of the first vertical side portion and the second vertical side portion are narrowed. The connecting portion between the first horizontal side and the second horizontal side contacts the inner surface of the first vertical side, and the connecting portion between the second horizontal side and the third horizontal side contacts the inner surface of the second vertical side. To do. Further, as the distance between the first vertical side portion and the second vertical side portion is narrowed, both connecting portions are required to slide downward while contacting the inner surfaces of the first vertical side portion and the second vertical side portion, respectively. The However, in the connection part, when the fastener is inserted into the gap and the distance between the two vertical side parts is narrowed, the contact resistance increases from the moment of contact with the inner surface of the vertical side part. Hateful. Actually, the direction when both vertical sides are narrowed is substantially horizontal (or slightly obliquely downward), whereas the direction in which the connecting part slides is substantially vertical, and the action of the sliding direction The force is too small to get a sliding force. Usually, when the fastener is inserted, the first lateral side portion is struck down, so that the connection portion between the first lateral side portion and the second lateral side portion is in contact with the inner surface of the first vertical side portion while being downward. Forcibly pushed down and slips. However, at the connecting portion between the second lateral portion and the third lateral portion, there is no such forced downward acting force, and it often occurs that the connecting portion does not slip. In some cases, a strange force is applied to the second vertical side portion and deforms to weaken the spring force. In an extreme case, the second vertical side portion may be partially damaged.

  In the fastener of Patent Document 1, with respect to the straight line connecting the connection portions of the first horizontal side portion and the second horizontal side portion, the connection portions of the second horizontal side portion and the third horizontal side portion, The longitudinal direction of the second lateral side portion is inclined downward. Therefore, when the fastener is attached, if the distance between the first vertical side portion and the second vertical side portion is suddenly narrowed, the center is downwardly convex (upper concave) even if the second horizontal side portion is deformed. Transforms into As a result, the angle of the connecting portion between the first lateral side and the second lateral side (that is, the angle between the first lateral side and the second lateral side) becomes wider than the initial state, resulting in a smooth curve. So it becomes slippery. However, the connecting portion between the first horizontal side portion and the second horizontal side portion becomes slippery with respect to the inner surface of the first vertical side portion, and the connecting portion between the second horizontal side portion and the third horizontal side portion is , It is still in a state where it is difficult to slip with respect to the inner surface of the second lateral side portion. Therefore, also in this Patent Document 2, the first vertical side portion and the second vertical side portion are forcibly made in a state where the connecting portion between the second horizontal side portion and the third horizontal side portion does not slide on the inner surface of the second vertical side portion. The interval between and will be narrowed. As a result, the second lateral side is buckled and the elastic restoring force is lost.

  In particular, recently, a stainless steel plate has been used as a material for the fastener, instead of a normal steel material. In the case of a normal steel plate, the surface was subjected to a rust prevention treatment such as galvanization, so that it was relatively slippery when in contact with each other. However, this stainless steel plate is often used as it is without being plated as described above. In that case, it is relatively difficult to slip when in contact with each other, and the above problem is greatly highlighted. It is supposed to be.

  When the sound insulation plate fastener is inserted into the sound insulation wall gap with respect to the sound insulation plate fastener of the sound insulation wall as described above, the connection portion between the second lateral portion and the third lateral portion is the second vertical portion. There is also known one that aims to smoothly come into contact with the inner surface of the side and slide down. (Patent Document 2)

Japanese Utility Model Publication No. 04-57513 JP 2005-307632 A

In the thing of patent document 2, the slip is improved compared with patent document 1 grade | etc., And it is put to practical use. Recently, a sound insulating plate made of a synthetic resin such as a translucent plate has come out, and the weight is reduced. In addition, the length of the sound insulation plate itself is increased, and the space between the support columns to which the sound insulation plate is fitted is increased, so that the number of support posts and the number of fasteners is reduced, and the cost is reduced. There is a demand to reduce the assembly man-hours.
In order to use such a large sound insulation board, the fasteners of Patent Documents 1 and 2 have insufficient load resistance, and it is necessary to double the load bearing force applied to the fasteners. ing. In simple terms, it is conceivable to increase the thickness of the fastener to increase the load resistance, but this has the problem of increasing costs and weight.
Therefore, in the present invention, the purpose of the present invention is to significantly improve the load resistance by devising the shape of the fastener, using the fastener with the current plate thickness as much as possible without changing the thickness of the fastener. And

In order to achieve the above object, the first invention provides:
In a soundproof wall comprising a rectangular sound insulating plate and a support column having a groove portion that supports the edge of the sound insulating plate, when the sound insulating plate is inserted into the groove portion of the support column, the groove portion and the sound insulating plate A leaf spring type fastener that is mounted in a gap with the end edge portion and presses the sound insulating plate against the groove portion by elastic restoring force, and extends in a substantially vertical direction, and when mounted in the gap, the thickness direction The first vertical side portion that is in contact with the surface on the gap side in the thickness direction of the sound insulating plate and the first vertical side portion that faces the first vertical side portion, and the horizontal distance between the first vertical side portion is on the upper side The upper end of the side opposite to the first vertical side in the thickness direction abuts against one side of the U-shaped cross-section groove when extending in a substantially vertical direction so as to become larger toward the gap. 2 vertical sides and the upper end of the second vertical side are connected to the first vertical side from the upper end. A first horizontal side portion that extends, and a second horizontal side that is connected to the first vertical side portion side end portion of the first horizontal side portion and extends from the end portion toward the second vertical side portion side and obliquely downward. Connected to the second vertical side portion side end of the side portion and the second horizontal side portion, from the end portion to the first vertical side portion side and obliquely below or on the second vertical side portion side, and A first contact portion including a third lateral side portion extending obliquely upward, and a connecting portion between the first lateral side portion and the second lateral side portion being in contact with an inner surface of the first longitudinal side portion. A second contact portion that can contact the inner surface of the second vertical side portion between the second horizontal side portion and the third horizontal side portion and the third horizontal side portion. Formed,
A lower side portion connected to the lower end portion of the first vertical side portion and extending partway from the lower end portion of the first vertical side portion toward the second vertical side portion, and a front end portion of the lower side portion and a second vertical side And a sliding surface formed so as to slide in a direction in which the second contact portion is downward and approaches the first vertical side portion, connecting the lower end portion of the side portion,
In a state in which the clasp is mounted on the support column, the second contact portion is an inner surface of the second vertical side portion with respect to a movement in which a gap between the first vertical side portion and the second vertical side portion is narrowed. And then slides downward from the inner surface of the second vertical side portion to the inner surface of the sliding surface and contacts and slides downward and closer to the first vertical side portion, the first vertical side portion and the above Contrary to the movement in which the gap with the second vertical side portion becomes wide, the second contact portion comes into contact with the sliding surface and the inner surface of the base 2 vertical side portion and slides upward. Features.

The second invention is characterized in that, in the first invention, the sliding surface is a curved surface having an arcuate cross section.

According to a third aspect, in the second aspect, the radius of the sliding surface is larger than the radius of the second lateral side and the third lateral side.

In the first invention, when mounting in the gap between the sound insulation plate of the soundproof wall of the fastener and the column, the lower part of the first vertical side portion and the second vertical side portion of the fastener is inserted into the gap, When the insertion is further forced, the first contact portion comes into contact with the inner surface of the first vertical side portion, the second contact portion comes into contact with the inner surface of the second vertical side portion, and further insertion, The interval between the vertical side portion and the second vertical side portion is narrowed. At that time, since the first contact portion is forced into the first lateral side portion and a downward force is applied, the inner surface of the first vertical side portion can smoothly slide downward. . Further, the second contact portion smoothly slides downward on the inner surface of the second vertical side portion, smoothly moves on the sliding surface, and slides, so that the second contact portion comes into contact with the sliding surface and stops. Therefore, in this state, the fastener is shrunk and elastically held in the groove portion, so that a restoring force for returning to the original state is strong and a strong compression load is obtained.

In particular, around the end of insertion when the fastener is inserted into the groove portion, conventionally, the second contact portion slides in contact with the inner surface of the second vertical side portion, so that it slides smoothly, but the load during compression is not large, The elastic restoring force was not strong. However, in the first invention, after the second contact portion slides in contact with the inner surface of the second vertical side portion, the second contact portion smoothly moves to the sliding surface and slides. The compressive force to shrink becomes stronger, that is, this means that the elastic restoring force can be made stronger than before. Therefore, the compression load resistance (or elastic restoring force) of the fastener can be strengthened, so that the required strength as a fastener is ensured even if the length of the soundproof plate is increased and the interval between the columns is widened. It is excellent in that it can be done.

On the contrary, when the distance between the first vertical side portion and the second vertical side portion becomes wide, the second contact portion rises by sliding on the sliding surface. You can slide smoothly while maintaining.

In the second invention, the second contact portion can smoothly slide and move with the second vertical side portion and the sliding surface, and can maintain a high load resistance.

In the third invention, the first contact portion smoothly slides on the inner surface of the first vertical piece portion, and at the same time, the second contact portion can smoothly slide and move on the inner surface and the sliding surface of the second vertical piece portion, and withstand load. Can be kept high.

It is sectional drawing which shows the state by which the sound-insulation board fastener which concerns on Embodiment 1 of this invention was attached to the sound-proof wall. It is a perspective view of a sound-insulating board fastener. FIG. 2 is a simplified diagram for explaining the state of the sound insulating plate fastener when the interval is narrowed after the sound insulating plate fastener is inserted into the column as shown in FIG. 1. It is a graph which shows the relationship between a compression load and a space | interval.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 to 3 show an example in which a fastener is applied to a soundproof wall according to Embodiment 1 of the present invention. As shown in FIG. 1, a soundproof wall 1 provided with a fastener 10 is shown, and the soundproof wall 1 has a predetermined interval in a direction along the automobile road on both sides of the automobile road (the front and back direction of the paper surface of FIG. 1). It is provided with a number of columns 2, 2,. In FIG. 1, the cross section shows a state in which the sound insulating plate 4 and the fastener 10 are fitted into the column 2. The support column 2 is omitted from the drawing, but is made of H-shaped steel and has two U-shaped groove portions 3 and 3 extending in the length direction of the support column 2. The opening of each groove portion 3 is an automobile. It is erected so as to face in the direction along the road (the front and back direction in FIG. 1). That is, each groove part 3 is formed in the opposing surface of a pair of adjacent support | pillars 2 and 2 mutually.

  A plurality of sound insulating plates 4, 4,... Extending in the direction along the automobile road are fitted between the opposing groove portions 3 and 3 on the opposing surfaces of the pair of support columns 2 and 2 while being stacked in the vertical direction. Yes. Each of the sound insulating plates 4 is made of a plastic such as polycarbonate or a box type made of iron, aluminum, concrete, or the like, and the thickness t is set smaller than the groove width W of the groove portion 3. In addition, the metal exterior board (not shown) is stuck and fixed to the side surface opposite to the motorway of each support | pillar 2. As shown in FIG.

  In the gap (gap amount S = W−t) between each sound insulating plate 4 and each side surface on the opposite side of the automobile road in each groove portion 3, the sound insulating plate 4 is pressed against the side surface on the automobile road side of the groove portion 3 by elastic restoring force. In addition, a leaf spring type sound insulating plate fastener 10 made of spring steel or the like is mounted. The fastener 10 is provided at the upper end of each end portion in the length direction of each of the sound insulation plates 4, and the upper end portion of the side surface (the gap side surface) opposite to the automobile road in the thickness direction of the sound insulation plate 4 is the automobile road side. It is comprised so that it may press. A projection 4 a that fits into the fitting hole 11 a of the attachment side 11 of the fastener 10 is provided at the upper end of each sound insulating plate 4. In addition, the attachment side 11 of the fastener 10 that is superimposed on the upper side of the fastener 10 is provided with a recess 4b into which the protrusion 4a that fits into the hole 11a and protrudes further upward is inserted. As a result, the fastener 10 is prevented from being detached, and the sound insulating plate 4 is aligned, and the movement of the lower end portion in the thickness direction is restricted.

  Specifically, as shown in FIG. 1, when the fastener 10 is attached to the gap S, the fastener 10 is attached to the lower surface of the attachment side portion 11 in contact with the upper end surface of the sound insulating plate 4. The fitting hole 11a is substantially fitted into the fitting section 4a (see FIG. 1) having a circular cross section that protrudes from the upper end surface of the side section 11. An upper end portion of the first vertical side portion 12 extending substantially in the vertical direction is connected to the end portion of the attachment side portion 11 opposite to the automobile road. The side surface of the automobile road in the thickness direction of the first vertical side portion 12 comes to substantially abut on the side surface of the gap in the thickness direction of the sound insulating plate 4 when the fastener 10 is mounted in the gap S. Yes.

Connected to the upper end portion of the second vertical side portion 13 is a first horizontal side portion 14 extending from the upper end portion to the first vertical side portion 12 side and substantially downward to the vicinity of the first vertical side portion 12. . The first vertical side portion 14 side end portion (lower end portion) of the first horizontal side portion 14 is substantially near the second vertical side portion 13 on the second vertical side portion 13 side and obliquely downward from the end portion. The 2nd horizontal side part 15 extended to is connected. A third horizontal side portion 16 extending from the end portion toward the first vertical side portion 12 side and obliquely downward is connected to the end portion of the second horizontal side portion 15 on the second vertical side portion 13 side. . The second lateral side and the third lateral side are provided at a substantially right angle. A connection portion between the first lateral side portion 14 and the second lateral side portion 15 is provided with a first contact portion 17 having a substantially arc-shaped cross section that can contact the inner surface of the first longitudinal side portion 12, and the second lateral side portion A second contact portion 18 having a substantially arc-shaped cross section that can contact the inner surface of the second vertical side portion 13 is provided at a connection portion between the first horizontal side portion 16 and the third horizontal side portion 16. The first contact portion 17 and the second contact portion 18 are formed in a smooth cross-sectional substantially arc shape.
The third horizontal side portion 16 extends from the end portion toward the second vertical side portion 13 and obliquely upward to the side end portion of the second vertical side portion 13 of the second horizontal side portion 15. It may be provided. In this case, it is preferable that the distal end of the third horizontal side portion 16 be further bent so as to extend toward the second vertical side portion 13 and obliquely upward.
The first contact portion 17 and the second contact portion 18 are not arcuate and may be simple bent portions.

The lower side 19 is connected to the lower end of the first vertical side 12 and extends from the lower end of the first vertical side 12 toward the second vertical side 13 in the middle. The sliding surface 20 connects the tip end portion of the lower side portion 19 and the lower end portion of the second vertical side portion 13, and is formed so that the second contact portion 18 slides downward and in a direction approaching the first vertical side portion 12. Yes. The sliding surface 20 has an arc-shaped cross section formed with one radius, but it is only necessary that the second contact portion 18 can slide and move smoothly between the second vertical side portion 13 and the sliding surface 20. It is not limited to this shape. For example, it may be formed in a plurality of arc shapes, a plurality of straight lines, or a combination thereof.
The radius of the sliding surface is larger than the radius of the second lateral side and the third lateral side. An interval between the first vertical piece 12 and the second vertical side 13 (that is, the lower side 19 is extended as it is to the second vertical side 13 and intersects with an extension line of the second vertical side 13. Compared to the distance between the point and the first vertical side), it is practically preferable to be less than half and more than 1/4.
The interval between the lower end portions of the first vertical side portion 12 and the second vertical side portion 13 is formed slightly smaller than the gap S and is easily inserted into the gap S. The upper end of the side surface opposite to the first vertical side portion 12 in the thickness direction of the second vertical side portion 13 (the side opposite to the automobile road) is the same as the automobile road of the groove portion 3 when the fastener 10 is attached to the gap S. It comes into contact with the opposite side surface.

  A bead-shaped first deformable portion 31 that protrudes inward (in the direction of the first vertical side portion 12) is formed on the second vertical side portion 13. At a substantially intermediate position in the vertical direction of the second vertical side portion 13, there is a retaining protrusion 40 that is formed by cutting out a part in the width direction of the first deformable portion 31 and whose tip can contact the inner surface of the groove portion 3 of the column 2. Is provided. The retaining protrusion 40 prevents the fastener 10 from coming out of the gap S due to vibration or the like.

  A first reinforcing bead portion 32 is provided at the central portion in the width direction of the first lateral side portion 14 and the second lateral side portion 15 so as to protrude outward over substantially the entire length direction. The first reinforcing bead portion 32 is also formed on the first contact portion 17 between the first lateral side portion 14 and the second lateral side portion 15 so as to protrude outward with the same width. The strength of the first lateral side portion 14, the second lateral side portion 15 and the first contact portion 17 is increased.

  Specifically, the situation when the fastener 10 is inserted into the gap S will be described. In the first embodiment, as shown in FIG. 2, the fastener 10 is in a free state, the first contact portion 17 does not contact the inner surface of the first vertical side portion 12, and the second contact portion 18 also has the second vertical length. This is an example in which a floating state is used from the inner surface of the side portion 13. As shown in FIGS. 1 and 3, when the fastener 10 is inserted into the gap S and the first lateral side portion 14 is struck with a hammer or the like and further inserted into the interior, the first vertical side portion 12 and the second longitudinal side portion 12 are connected. The interval with the vertical side portion 13 becomes narrow, and first the first contact portion 17 slides downward while contacting the inner surface of the first vertical side portion 12. Accordingly, the second contact portion 18 comes into contact with the first deformable portion 31, slides on the first deformable portion 31 and moves downward, and further moves to the inner surface of the second vertical side portion 13 and slides. In this state, in FIG. 4, as the interval S becomes narrower, the compression resistance load gradually increases. Since this gap does not change greatly in the normal use range, the second contact portion 16 can be used to the extent that it slides up and down the inner surface of the second vertical side portion 13.

  On the other hand, when the soundproof wall 1 is vibrated greatly due to large vibrations or strong winds, and a large load is applied to the gap, the second contact portion 16 becomes the second vertical side portion 13. Go to the lower end of the car and get on the sliding surface 20 smoothly.

  Further, when a force is applied so that the interval S becomes narrower than that, the second contact portion 18 moves from the inner surface of the second vertical side portion 13 to the inner surface of the sliding surface 20 and slides obliquely downward. In this state, in FIG. 4, the compressive load gradually increases gradually while the second contact portion 18 slides on the sliding surface 20. As a result, the second contact portion 18 slides in contact with the inclined surface of the sliding surface 20 narrowed further inward than the second vertical side portion 13, so that the compression load of the fastener 10 increases. As a result, the restoring force of the fastener 10 is strengthened.

  In contrast, with respect to the movement in which the gap between the first vertical side portion 12 and the second vertical side portion 13 widens, the second contact portion 18 contacts the inner surface of the sliding surface 20 and slides obliquely upward. It has become. In this state, when a force that increases the distance S is applied, the second contact portion 18 contacts the inclined surface of the sliding surface 20 and smoothly slides upward, and the transition of the second vertical side portion 13 も also occurs. It is done in lick red. In this state, in FIG. 4, the load returns smoothly on the same curve and smoothly slides while gradually decreasing the load resistance.

  When the fastener 10 is inserted into the gap S and the distance between the first vertical side portion 12 and the second vertical side portion 13 is narrowed, the second horizontal side portion 15 is basically not deformed. Slightly elastically deformed and curved. In this case, since the longitudinal direction of the second lateral side portion 15 is located below the virtual line connecting the first contact portion 17 and the second contact portion 18, the second lateral side portion 15 is elastically deformed. When it does, it swells downward and deforms. As a result, the angle between the first lateral side portion 14 and the second lateral side portion 15 increases, and the curvature of the first contact portion 17 decreases, so that the first contact portion 17 becomes slippery and buckles. Deformation and cracking are less likely to occur.

  As described above, while the fastener 10a is being used in the gap S, the soundproof wall is shaken by vibration, strong wind, etc., and the gap interval is reduced or enlarged. The interval between the first vertical side 12 and the second vertical side 13 always changes. Therefore, it is necessary for the fastener to smoothly follow the reduction / expansion of the interval. That is, it is necessary for the second contact portion 18 to smoothly slide on the inner surface of the second vertical side portion 13 in order to smoothly follow the reduction / expansion of the interval. At the same time, it is necessary to increase the resistance to compression.

  Thus, as described above, the fastener is strongly required to smoothly follow the reduction and enlargement of the gap after insertion. In response to this requirement, the second contact portion 18 has a function of sliding on the sliding surface 20, so that the followability is good with respect to reduction / expansion of the gap due to vibration, wind force, etc. after insertion. In addition, the compressive load can be kept high, and an excellent function is exhibited.

  In the above embodiment, in a free state where the fastener 10 is not inserted into the gap S, the first contact portion 17 contacts the inner surface of the first vertical side portion 12, and the second contact portion 18 is the second vertical side portion. 13 is formed so as not to contact the inner surface of 13 but to contact when inserted into the gap S between the sound insulating plate 4 and the groove 3. However, it may be formed so as to come into contact with the inner surface of the second vertical side portion 13 with a light force from the beginning in a free state. However, considering the ease of insertion, the former, which is not in contact in a free state, is preferable.

  The first reinforcing beads 32 formed on the first lateral side portion 14 and the second lateral side portion 15 are formed to protrude outward, but may be formed to protrude inward. Moreover, the 1st deformation | transformation part 31 provided in this 1st reinforcement bead 32 and the 2nd vertical side part 13 may be formed not only in 1 item | strip | line but in multiple items | stripes. In particular, it is preferable to provide a plurality of reinforcing beads and deformed portions in the case where the second vertical side portion is wide.

4 Sound insulating plate 10 Fastener 11 Mounting portion 12 First vertical side portion 13 Second vertical side portion 14 First horizontal side portion 15 Second horizontal side portion 16 Third horizontal side portion 17 First contact portion 18 Second contact portion 20 Sliding surface 40 Retaining protrusion

Claims (3)

In a soundproof wall comprising a rectangular sound insulating plate and a support column having a groove portion that supports the edge of the sound insulating plate, when the sound insulating plate is inserted into the groove portion of the support column, the groove portion and the sound insulating plate A leaf spring type fastener that is mounted in a gap with the end edge portion and presses the sound insulating plate against the groove portion by elastic restoring force, and extends in a substantially vertical direction, and when mounted in the gap, the thickness direction The first vertical side portion that is in contact with the surface on the gap side in the thickness direction of the sound insulating plate and the first vertical side portion that faces the first vertical side portion, and the horizontal distance between the first vertical side portion is on the upper side The upper end of the side opposite to the first vertical side in the thickness direction abuts against one side of the U-shaped cross-section groove when extending in a substantially vertical direction so as to become larger toward the gap. 2 vertical sides and the upper end of the second vertical side are connected to the first vertical side from the upper end. A first horizontal side portion that extends, and a second horizontal side that is connected to the first vertical side portion side end portion of the first horizontal side portion and extends from the end portion toward the second vertical side portion side and obliquely downward. Connected to the second vertical side portion side end of the side portion and the second horizontal side portion, on the first vertical side portion side and obliquely below from the end portion, or on the second vertical side portion side And a third horizontal side portion extending obliquely upward, and a connecting portion between the first horizontal side portion and the second horizontal side portion is capable of contacting the inner surface of the first vertical side portion. A second contact portion that is formed as a portion and can contact an inner surface of the second vertical side portion between a connection portion between the second horizontal side portion and the third horizontal side portion and the third horizontal side portion. Formed,
A lower side portion connected to the lower end portion of the first vertical side portion and extending partway from the lower end portion of the first vertical side portion toward the second vertical side portion, and a front end portion of the lower side portion and a second vertical side And a sliding surface formed so as to slide in a direction in which the second contact portion is downward and approaches the first vertical side portion, connecting the lower end portion of the side portion,
In a state in which the clasp is mounted on the support column, the second contact portion is an inner surface of the second vertical side portion with respect to a movement in which a gap between the first vertical side portion and the second vertical side portion is narrowed. And then slides downward from the inner surface of the second vertical side portion to the inner surface of the sliding surface and contacts and slides downward and closer to the first vertical side portion, the first vertical side portion and the above Contrary to the movement in which the gap with the second vertical side portion becomes wide, the second contact portion comes into contact with the sliding surface and the inner surface of the base 2 vertical side portion and slides upward. Sound insulation plate clasp for the soundproof wall.   2. The sound insulation plate fastener for a sound insulation wall according to claim 1, wherein the sliding surface is a curved surface having an arcuate cross section.   The sound insulation plate fastener for a sound insulation wall according to claim 2, wherein the radius of the sliding surface is larger than the radius of the second lateral portion and the third lateral portion. .

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