JP2018091129A - Anti-collapse sound barrier of road and anti-collapse installation method of sound-absorbing plate of sound barrier thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fall prevention of a sound-absorbing plate of a sound barrier provided in an expressway and the like.SOLUTION: A sound barrier composed of a sound-absorbing plate 10 supported by an adjacent support column 2. A wire fastener 20, a wire holder 30, and a wire connecting member 40 are fixed to the support column 2 on both the ends of a fall prevention installation section A, the support column 2 of an excess length storage section B, and each sound-absorbing plate 10 of the fall prevention installation section A, respectively. A wire 50 supported by the wire fastener 20 is stretched tightly in the longitudinal direction of the sound barrier passing in front of each sound-absorbing plate 10 provided within the fall prevention installation section A. The wire 50 passing in front of each sound-absorbing plate 10 passes through a hole of the connecting member 40 secured to each sound-absorbing plate 10 to be supported by each of the connecting member 40. The wire 50 is held at both the ends thereof by the wire holder 30, the wire holder 30 is released from holding an end metal fitting upon receiving a tensile force beyond a predetermined value, and end metal fitting abuts on the wire fastener 20 and is clamped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sound insulating wall composed of a sound absorbing plate installed on an expressway or the like, and more specifically, a soundproofing soundproofing wall with measures to prevent the sound absorbing plate from collapsing, and an existing sound insulating wall are modified to prevent the sound absorbing plate from collapsing. The present invention relates to a fall prevention construction method capable of preventing the collapse.

  For example, a sound insulation wall of an expressway is constructed by stacking a large number of box-shaped sound absorbing plates between columns that are erected at regular intervals on the side of the road.

  This sound insulation wall is devised so that the stacking of the sound absorbing plates does not collapse. Usually, a rim (rim) provided at the lower end of the upper sound absorbing plate is engaged with the upper end of the lower sound absorbing plate, The lower sound absorbing plates are prevented from being detached from each other.

  However, due to the strong wind blowing on the sound insulation wall and the collision of the vehicle against the sound insulation wall, the stacking of the sound absorbing plates collapses, the sound absorbing plates are destroyed and dropped, or the panels constituting the sound absorbing plate are scattered. There are concerns that these events may lead to personal injury.

  In view of this, a measure has been considered in which individual sound absorbing plates are connected with wires so that even if one sound absorbing plate is detached from the sound insulation wall due to an impact, it is supported by the wires and is not scattered.

  However, when the wire is stretched around the sound insulation wall, for example, when the vehicle collides with the sound insulation wall and the sound absorbing plate falls, the wire gets entangled with the vehicle, drags the wire, and continuously connects the other sound absorbing plates connected to the wire. There is a risk of collapse.

  In addition, when a collapse prevention work is performed on an existing sound insulation wall, various works may be required not only from the road side of the sound insulation wall but also from the outer surface of the road. However, for an elevated road or the like, the road outer surface of the sound insulation wall is located at a high place, so it is necessary to assemble a work scaffold and work efficiency is not good.

  Therefore, the present invention supports a sound absorbing plate of a sound insulating wall provided on an expressway or the like with a wire while suppressing deterioration of the appearance to prevent collapse, and at the same time, even if the sound absorbing plate is detached from the sound insulating wall, the wire is The problem is to prevent the sound absorbing plate from collapsing and to prevent the sound absorbing plate from collapsing only from the road side.

  In order to solve the above-mentioned problems, the present invention is a sound insulation wall composed of a rectangular box-shaped sound absorbing plate supported and stacked by adjacent struts, and a maximum length for preventing the sound absorbing plate from falling is defined. Wire stoppers are fixed to the struts at both ends of the fall prevention installation section, and the wires supported by the struts at both ends of the fall prevention installation section via the wire stoppers are in the fall prevention installation section. A wire extending in the longitudinal direction of the sound insulation wall through the front surface of the sound absorbing plate and passing through the front surface of each sound absorbing plate is passed through a hole of a connecting member fixed to the front surface of each sound absorbing plate and supported by each of the connecting members. And both ends of the wire are held by a wire holder attached to a support column at a position adjacent to the fall prevention installation section, and the holding is performed by attaching end fittings fixed to both ends of the wire to the wire holder. The wire holding tool is used to release the holding of the end fitting when a tension exceeding a predetermined value is applied to the wire, and the wire holding tool is released when the holding is released. A collapsible soundproof wall configured such that end metal fittings at both ends of the metal fitting abut against the wire stopper metal fittings fixed to struts at both ends of the fall prevention installation section. The total length of the fall prevention installation section is preferably set to 50 m or less.

  The wire stopper includes a hook that is engaged with a side edge of the flange at one end of a base portion that is attached to the surface of the flange facing the road of the H-shaped steel that constitutes the support, and the base A retaining plate protruding to the road side is connected to the other end of the section, and two of the separate metal fittings having through holes are combined to face each other and the holding plate of the two separate metal fittings is made of rubber. It is preferable that the plates are abutted together and fastened with bolts and nuts.

  Further, the through hole provided in the wire stopper is a so-called Dharma hole that combines a lower small-diameter hole portion through which the end fitting is prevented from passing through and an upper large-diameter hole portion through which the end fitting is allowed to pass through, It is preferable to have a structure in which the large-diameter hole is sealed with the rubber plate after the wire is drawn.

  The wire holder uses the wire clamp, replacing the rubber plate sandwiched between the clamp plates of the bracket with a rubber plate having the holding hole separated at one outer periphery by a slit. preferable.

  The wire has an extra length, and the length is longer than the length of the fall prevention installation section. This wire may be obtained by connecting several wires using a connection fitting.

  The connecting member is preferably a combination of an anchor bolt inserted from the front surface of the sound absorbing plate and an eye nut screwed to the anchor bolt, and a plurality of the connecting members are fixed to the respective sound absorbing plates. Is preferred.

The present invention also provides a method for preventing the sound absorbing plate from collapsing for constructing the sound insulating wall having the above structure.
The construction method is such that the wire stoppers are attached to the struts at both ends of the fall prevention installation section for preventing the sound absorbing plate from falling, the wire holders are attached to the struts adjacent to the fall prevention installation section, and the fall prevention installation section. A first step of attaching the connecting member to each sound absorbing plate in the first step,
A second step of passing a wire having end fittings secured to both ends thereof through the hole of the connecting member;
A third step of supporting both ends of the wire through the through holes of the wire stoppers fixed to the columns at both ends of the fall prevention installation section;
The sound insulation wall is passed through a fourth step of pulling the opposite ends of the wire in opposite directions and holding the end fittings provided at both ends of the wire with a wire holder attached to a support column at a position adjacent to the drop prevention installation section. This will complete the work to prevent the sound absorbing plate from collapsing.

  According to this invention, the sound absorbing plate is supported by the wire stretched in the longitudinal direction of the sound insulating wall. Therefore, even if the sound absorbing plate falls off the sound insulation wall due to a severe impact, it does not fall on the road or outside the road and scatter.

  Further, since the wire is stretched in the traveling direction of the vehicle or the like, even if the vehicle collides with the sound insulation wall, the wire does not get entangled with the vehicle, and the sound absorbing plate is not dragged by the wire. In addition, since the maximum length of the sound-absorbing plate drop-preventing installation section is specified to be, for example, 50 m or less, even if a continuous collapse occurs, the collapse is limited to the fall-prevention installation section.

  Furthermore, if the wire has a surplus length (longer than the length of the fall prevention installation section) and is stretched with a slack, the wire will fall due to an accident such as dropping of the sound absorbing plate. The shock is absorbed by the slack of the wire, and the destruction of other sound absorbing plates and the collapse of the support are prevented.

  However, when both ends of the wire provided with a sufficient surplus length are fixed to the struts at both ends of the fall prevention installation section, the surplus length portion drastically drops between the support points attached to each sound absorbing plate, and the appearance of the sound insulation wall is deteriorated.

  The sound insulation wall of the present invention is also provided with a measure for preventing deterioration of its appearance. That is, by pulling both ends of the wire to the position of the wire holder provided on the column adjacent to the fall prevention installation section and holding it with the wire holder, the extra length of the wire is digested and the support points The amount of slack is reduced, and the sound insulation wall is excellent in appearance and looks good.

  In addition, since the holding | maintenance of the both ends of the wire by the said wire holder is cancelled | released when the tension | tensile_strength exceeding a predetermined value is added with respect to a wire, the fall of the shock absorption capability by the extra length of a wire does not occur.

  According to the construction method of the present invention, since all the wire tensioning work can be performed from the road side, it is not necessary to perform the work from the outside of the sound insulation wall on an elevated road or the like, and the existing sound insulation wall can be efficiently prevented from collapsing. Can be applied.

  In this method, a metal fitting having a through hole of the Dharma hole is adopted as the wire stopper metal, and the end metal fittings at both ends of the wire are passed through the large diameter hole portion of the through hole and the wire passing through the hole is passed through the hole. When it is dropped into the small-diameter hole, and then the large-diameter hole is sealed with a rubber plate, the work efficiency can be further enhanced by using wires in which end fittings are fixed in advance at both ends.

  In addition, if the wire clamp is used, the wire passed through the wire clamp can be removed with the end bracket attached, so the sound absorbing plate can be replaced without replacing the wire or replacing the end bracket. Etc. can also be performed.

It is a perspective view which shows the outline | summary of an example of a collapse-resistant sound insulation wall. It is a partial cut-out enlarged front view of the collapse-resistant sound insulation wall of FIG. It is a front view which expands and shows a part of FIG. It is a front view which expands and shows a part of FIG. FIG. 5 is a cross-sectional view taken along line XX in FIG. 4. It is an expansion longitudinal cross-sectional view of a collapse-resistant sound insulation wall. It is a disassembled perspective view of a wire stopper. It is a perspective view which shows the rubber plate of a wire holder. It is a perspective view which shows the holding state of the wire end by a wire holder. It is a side view which shows the pulling-down state of the wire end by a wire stopper. It is a perspective view which shows the state which passed the wire through the hole of the connection member. It is an expansion perspective view of the principal part which shows the state which attaches a connection member to a sound-absorbing board. It is an expanded sectional view along the YY line of FIG. 3 of a sound-absorbing plate. It is a front view which shows the outline | summary of the other example of a collapse-resistant sound insulation wall. It is a partial cut-out enlarged front view of the collapse-resistant sound insulation wall of FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a sound insulation wall according to the present invention and a method for preventing collapse of a sound absorbing plate of the sound insulation wall will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 to 6, for example, on the side of the highway R, pillars 2 made of H-shaped steel are erected at regular intervals, and a rectangular box-shaped sound absorbing plate 10 is interposed between the neighboring pillars 2 and 2. The sound insulation walls 1 are formed by stacking (four steps in the figure).

In addition, the columns 2, 2 at both ends of the section selected as the fall prevention installation section A of the sound absorbing plate (the length of the section is preferably set to 50 m or less) are the same as the number of stacked sound absorbing plates 10. Are fixed at positions corresponding to the respective sound absorbing plates 10.
The wire stoppers 20 can be provided on all the struts 2 existing in the fall prevention installation section A, but the wire stoppers 20 provided on the pillars between both ends of the fall prevention installation section A are used as wire stoppers. Since it does not work, as shown in FIG. 1 and FIG.

  A section sandwiching the fall prevention installation section A is set as a surplus length storage section B, and the struts 2 at positions adjacent to the struts 2 at both ends of the fall prevention installation section A, that is, the surplus length storage section B in between. The number of wire holders 30 equal to the number of stacked sound absorbing plates 10 is fixed to the struts 2 at the sandwiched positions at positions corresponding to the sound absorbing plates 10 of each step.

  Further, the connecting member 40 is fixed to each of the sound absorbing plates 10 in the fall prevention installation section A so that its height position is substantially aligned with the height of the wire stopper 20.

  And the wire 50 supported by the said wire stopper 20 is stretched | stretched in the longitudinal direction of the sound insulation wall 1 through the front surface of each sound-absorbing board 10 in the fall prevention installation area A. As shown in FIG.

  The wire 50 is supported by each of the connecting members 40 through a hole of the connecting member 40 fixed to the front surface of each sound absorbing plate 10.

  Further, both ends of the wire 50 are held by the wire holder 30 attached to the column 2 adjacent to the fall prevention installation section A (the column of the extra length storage section B). End metal fittings 51 (see FIGS. 3 to 5 and 9 to 11) fixed to both ends of the wire holder 30 are engaged with the wire holder 30.

  The wire holder 30 is a member that releases the holding (clamping) of the end fitting 51 when a tension exceeding a predetermined value is applied to the wire 50. Details of the wire holder 30 used here will be described later.

  The wire 50 is made of a tough and weather-resistant flexible wire having a synthetic resin coating on a stainless steel strand or the like. At both ends of the wire 50, end fittings 51 made of a compression sleeve or the like are provided.

  In addition, although the wire 50 shown in FIGS. 1-6 is one continuous goods, depending on the length of the fall prevention installation area A, several wires were added using the connection metal fitting (illustration omitted). A wire may be used.

  Further, if necessary, a wire having a turnbuckle for adjusting the length (also not shown) in the middle of the length may be used.

  The wire stopper 20 is provided as shown in FIG. 7 is a combination of two separate metal fittings 21 and a rubber plate 22.

  The separate metal fitting 21 includes a base portion 21a attached to the surface of the flange 2a (see FIGS. 5 and 10) on the side facing the road of the H-shaped steel constituting the support 2, and a hook 21b formed at one end of the base portion. And a mooring plate 21c protruding toward the road connected to the other end of the base portion 21a.

  As shown in FIG. 5, the separate metal fitting 21 is obtained by engaging the hook 21 b with the side edge of the flange 2 a of the support column 2 so that the two are opposed to each other, and the mooring plate 21 c of the two separate metal fittings 21. The rubber plate 22 is sandwiched between the bolts 21d and 22b (see FIG. 7) provided in the separate metal fittings 21 and the rubber plate 22, and bolts and nuts 23 are passed through. What is fastened with bolts and nuts 23 is used. The bolt hole 22b provided in the rubber plate 22 is a vertically long slot.

  A through hole 24 is provided in the mooring plate 21c. The through-hole 24 is a so-called Dharma hole in which a lower small-diameter hole portion 24 a that prevents passage of the end fitting 51 and an upper large-diameter hole portion 24 b that passes through the end fitting 51 are combined. A through hole 22a corresponding to the through hole 24 is also provided in the rubber plate 22 (see FIG. 7).

  The large-diameter hole portion 24b of the through-hole 24 is sealed as shown in FIG. 10 by a rubber plate 22 that lowers the position after the wire is passed through. As a result, the wire 50 dropped into the small-diameter hole portion 24a is blocked by the large-diameter hole portion 24b. Is prevented by the rubber plate 22 and is once locked in the small diameter hole 24a.

  As shown in FIGS. 11 to 13, the connecting member 40 includes an anchor bolt 41 and an eye nut 42. An elongated locking piece 43 is attached to the tip of the anchor bolt 41 so as to be swingable with a support pin perpendicular to the anchor bolt axis as a fulcrum. The rocking center of the locking piece 43 is located at a position deviated from the center of gravity of the locking piece 43 toward one end.

  As shown in FIGS. 12 and 13, the sound absorbing plate 10 in the fall prevention installation section A is provided with a through hole 14 that penetrates the sound absorbing plate 10 in the thickness direction, as shown in FIGS. 12 and 13.

  As shown in FIG. 12, the anchor bolt 41 and the locking piece 43 directed in the axial direction of the anchor bolt are inserted into the through-hole 14 from the front side of the sound absorbing plate 10 (the side facing the road).

  When the locking piece 43 passes through the through hole 14, the locking piece 43 swings in the standing direction and is prevented from coming off from the through hole 14 as shown in FIG. 13 due to the eccentricity of the swing center from the position of the center of gravity. In this state, the eye nut 42 is screwed into the anchor bolt 41 to fix the connecting member 40 to the sound absorbing plate 10.

  The number of connecting members 40 fixed to one sound absorbing plate 10 may be one or more, and the number is not limited. The anchor bolt 41 of the connecting member 40 may be not only in the form of a hang piece as shown, but also in a form in which the tip is expanded.

  If possible, the nut may be screwed to the tip to prevent it from coming off. In that case, an eyebolt can be used instead of the eyenut.

  As shown in FIGS. 1 to 3, 6, and 11, the wire 50 is loosely inserted into a hole (ring of the eye nut 42) of the support member 40 fixed to the surface of the sound absorbing plate 10 supported by the support 2. Furthermore, it is extended in the longitudinal direction of the road and passed through the through hole 24 of the wire stopper 20 fixed to the pillars 2 at both ends of the fall prevention installation section A as shown in FIGS.

  For passing the wire 50 through the through hole 24, the end fitting 51 is passed through the large diameter hole portion 24 b of the through hole 24, and the wire 50 is dropped into the small diameter hole portion 24 a of the through hole 24. Thereafter, the bolts and nuts 23 are loosened to lower the position of the rubber plate 22 until the large-diameter hole 24b is blocked, and the bolts and nuts 23 are tightened to close the large-diameter hole 24b. Stop lifting.

  Next, both ends of the wire 50 are guided to the extra length accommodation section B and led to the wire holder 30 attached to the support column 2 of the extra length accommodation section B, as shown in FIGS. 1 to 5 and FIG. The wire holder 30 holds the wire.

  The wire end holding by the wire holder 30 is released when a tension exceeding a predetermined value is applied to the wire 50.

  The wire holder 30 uses two separate metal fittings 21 of the wire stopper 20, that is, between the two separate metal fittings 21 and 21 and the mooring plates 21c and 21c of the two separate metal fittings. A combination of sandwiched rubber plates 31 (see FIG. 8) is used.

  Unlike the rubber plate 22 of the wire clamp 20, the rubber plate 31 has a holding hole 33 that is separated from the outer periphery by a slit 32 and a bolt hole 34 that corresponds to the bolt hole of the mooring plate 21c. Has been.

  The rubber plate 31 has a strength capable of retaining the wire end. If the plate is a rubber plate having a thickness of about 5 mm, for example, the wire end can be retained. The holding hole 33 provided in the rubber plate 31 has a hole diameter smaller than the diameter of the end fitting 51 attached to the end of the wire.

  The slit 32 is opened, the wire 50 is inserted into the holding hole 33, the end fitting 51 at the wire end is abutted against the hole edge of the holding hole 33, and the wire end is fastened by the rubber plate 31 (see FIG. 9). In this invention, this state is called holding of the wire end.

  By holding the wire 50 extending in the longitudinal direction of the road and stretched on the front surface of the sound absorbing plate, the extra length is absorbed and the support points (the positions where the connecting member 40 and the wire stopper 20 are respectively in contact) are between the support points. Is reduced, and the deterioration of the appearance of the sound insulating wall 1 due to the loosening of the wire 50 is suppressed.

  The wire 50 stretched as described above has less slack between the adjacent connecting members 40 and 40 and less slack between the connecting member 40 and the wire stopper 20 adjacent thereto. Since all the portions wired in the storage section B are extra lengths, the shock absorbing ability when an accident such as a drop of the sound absorbing plate 10 occurs is ensured without any problem.

  When the sound absorbing plate 10 falls or the like, a tension exceeding a predetermined value is applied to the wire 50. As a result, the rubber plate 31 of the wire holder 30 is deformed and the end of the wire is detached from the holding hole 33, and the end fitting 51 is fixed to the struts 2 at both ends of the fall prevention installation section A as shown in FIG. The surplus length portion of the wire 50 is drawn out until it hits the stopper 20 and is fastened. For this reason, the impact is well absorbed.

  The length of the wire 50 can be adjusted when a turnbuckle is interposed in the middle of the length. In addition, when the wire 50 is a plurality of wires that are connected using a disconnectable and reconnectable metal fitting, a short wire is passed through the connecting member 40 and then added to form a series of wires. Therefore, the wire tensioning work is easy.

  Also, when replacing some of the sound absorbing plates 10 in the fall prevention installation section A, a part of the wire 50 is cut off and removed from the sound absorbing plate 10 and attached to a new sound absorbing plate 10 in a short wire state. This improves the workability of replacement.

  The end fitting 51 at the end of the wire 50 can be attached to the wire end on site. In such a case, the wire stopper 20 can be one having a through-hole whose diameter is smaller than the outer diameter of the end fitting 51. However, the end fitting 51 at the end of the wire has a fixing force if it is mounted in the factory in advance. It is easy to manage.

  If the illustrated wire stopper 20 in which the through hole 24 is a dharma hole is used, the wire 50 to which the end fitting 51 is attached in advance can be used.

  In addition, the wire holder 30 is preferably the exemplified wire holder 30 that can repeatedly use the rubber plate 31 and can use the separate metal fitting 21 that is the same as the wire stopper 20. The member holding the wire end may be broken when the tension exceeding the value is applied, or the wire end holding may be released.

  As shown in FIGS. 6 and 13, the sound absorbing plate 10 forming the sound insulating wall 1 is provided with a bottom wall 12a and a top wall 12b above and below the front plate 11 and the back plate 12 to form a rectangular box body. The box body is filled with a sound absorbing material 13 made of a foamed synthetic resin plate or the like.

  The sound absorbing plate 10 shown in FIG. 6 is shown in FIGS. 6 and 13 in consideration of the convenience of stacking, in order to improve drainage, with the bottom wall 12a being an inclined plate that descends in the direction of the front plate 11. As described above, the bottom wall 12a is provided with a heel 12c for matching the slopes of the upper and lower bottom walls 12a and 12b.

  The sound-absorbing plate 10 has a bottom wall 12a that has the same inclination as the top wall 12b, the heel 12c is omitted, a bottom wall 12a and a front plate 11 provided with drain holes, and rainwater that has flowed into the lower part of the interior. Various structural changes and additions can be made such as a block inserted for controlling the flow direction.

  3 and 12, reference numeral 11 a is a louver provided on the front plate 11, and reference numeral 12 d is a tapered recess provided on the back plate 12. The recess 12 d protrudes into the box-shaped sound absorbing plate 10 and serves as a pressing portion for the sound absorbing material 13.

  Next, the additional construction method of the sound absorbing plate fall prevention work for the existing sound insulation wall of the expressway will be described.

  The members prepared in advance are the wire stopper 20, the wire holder 30, the connecting member 40, the wire 50, and the like. When the wire stopper 20 shown in FIGS. 7 and 10 is used as the wire 50, a wire 50 with an end fitting 51 attached in advance is prepared.

  When the wire 50 is used by adding a plurality of wires, a connecting fitting for addition and a turnbuckle for adjusting the length are prepared as necessary.

  Next, when these equipments are brought into the field, as shown in FIGS. 1 to 5, wire clamps 20 are provided on the surfaces facing the highway R of the columns 2 at both ends of the fall prevention installation section A. The sound absorbing plates 10 at each stage are fixed one by one while corresponding to each.

  As shown in FIG. 4 and FIG. 5, the hook 21b of the separate metal fitting 21 is engaged with the edge of the flange 2a of the column 2 and the mooring plates 21c of the two separate metal fittings 21 that are opposed to each other are interposed between the hooks 21b. This is done by fastening the plate 22 with bolts and nuts 23.

  In addition, the wire holder 30 is made to correspond to the sound absorbing plate 10 at each stage on the support 2 at the position adjacent to the support 2 at both ends of the fall prevention installation section A (the support at the position where the extra length storage section B is sandwiched). It is attached in the same manner as the attachment of the fastener 20.

  Furthermore, the through-hole 14 is provided in each of the sound absorbing plates 10 in the fall prevention installation section A, and the connecting member 40 is attached. The order of the above operations is not limited.

  Next, the wire 50 is passed through the hole (eyenut ring) of the connecting member 40 fixed to each sound absorbing plate 10, and further, the through hole of the wire stopper 20 fixed to the struts 2 at both ends of the fall prevention installation section A. The end fitting 51 is passed through the 24 large-diameter hole 24 b, and the wire 50 is dropped into the small-diameter hole 24 a of the through hole 24.

  Then, the bolts and nuts 23 are slightly loosened (can be loosened in advance), the rubber plate 22 between the anchoring plates 21c and 21c is slid down, and the wire 50 is inserted into the large-diameter hole portion 24b of the through-hole 24. The rubber plate 22 is closed so as not to float on the portion 24b.

  Thereafter, the end of the wire 50 is stretched and inserted into a holding hole 33 with a slit provided in the rubber plate 31 of the wire holder 30 attached to the support column 2 in the extra length storage section B. 51 is abutted against the rubber plate 31 and the wire holder 30 holds the wire end.

  In addition, when the fall prevention installation section divided into several is continued in the longitudinal direction of a road, a part of fall prevention installation section of an adjacent position is utilized as an extra length accommodation area. An example of such a sound insulation wall is shown in FIGS.

  In the case of this configuration, at the installation point of the wire holder 30 that holds the wire end, as shown in FIGS. 14 and 15, the wire 50 stretched in the fall prevention installation section straddles under the wire holder 30. Wire as follows.

DESCRIPTION OF SYMBOLS 1 Sound insulation wall 2 Support | pillar 2a Flange 10 Sound-absorbing plate 11 Front plate 11a Louver 12 Back plate 12a Bottom wall 12b Top wall 12c Heel 12d Recess 13 Sound-absorbing material 14 Through hole 20 Wire clamp 21 Separator 21a Base 21b Hook 21c Mooring plate Board)
22 Rubber plate 23 Bolt / nut 24 Through hole 24a Small diameter hole 24b Large diameter hole 30 Wire holder 31 Rubber plate 32 Slit 33 Holding hole 34 Bolt hole 40 Connecting member 41 Anchor bolt 42 Eye nut 43 Locking piece 44 Support pin 50 Wire 51 End fitting R Expressway A Fall prevention installation section B Extra length storage section R Expressway

Claims (5)

It is a sound insulation wall consisting of a rectangular box shaped sound absorbing plate supported and stacked by adjacent struts,
Wire clamps are fixed to the struts at both ends of the fall prevention installation section where the maximum length to prevent the sound absorbing plate from falling is fixed, and supported by the struts at both ends of the fall prevention installation section via the wire clamps. Are stretched in the longitudinal direction of the sound insulation wall through the front surface of each sound absorbing plate in the fall prevention installation section,
A wire passing through the front surface of each sound absorbing plate is passed through a hole of a connecting member fixed to the front surface of each sound absorbing plate and supported by each of the connecting members,
Furthermore, both ends of the wire are held by a wire holder attached to a support column at a position adjacent to the fall prevention installation section, and the holding is performed by using end fittings fixed to both ends of the wire to the wire holder. Done by engaging
The wire holder is used to release the holding of the end fitting when a tension exceeding a predetermined value is applied to the wire, and the end fittings at both ends of the wire are released when the holding is released. A collapsible soundproof wall configured to abut against and hold the wire stoppers fixed to the struts at both ends of the fall prevention installation section.   The wire stopper includes a hook that engages with a side edge of the flange at one end of a base portion that is attached to the surface of a flange facing the road of the H-shaped steel that constitutes the strut, and the base A retaining plate that protrudes toward the road is connected to the other end of the section, and two of the separate metal fittings having through holes are combined with the holding plate so as to face each other. The collapsible soundproof wall according to claim 1, wherein a rubber plate is disposed so as to be abutted with each other and fastened with bolts and nuts.   The through-hole provided in the wire stopper is a dharma hole that combines a lower small-diameter hole that prevents passage of the end fitting and an upper large-diameter hole that allows passage of the end fitting, The collapsible sound-insulating wall according to claim 2, wherein the large-diameter hole is sealed by the rubber plate after the wire is passed through the through hole.   The wire holder includes a hook that engages with a side edge of the flange at one end of a base portion that is attached to the surface of a flange facing the road of the H-shaped steel that constitutes the support column, and further, the base portion A retaining plate protruding toward the road side is connected to the other end of the two, and two separate metal fittings having through-holes are combined to face each other. The collapsible soundproof wall according to any one of claims 1 to 3, wherein one part is provided with a rubber plate having a holding hole separated by a slit so as to be abutted and fastened with a bolt and a nut. . A construction for preventing collapse of the sound absorbing plate for constructing the collapsible soundproof wall according to any one of claims 1 to 4,
The wire clamps are attached to the struts at both ends of the fall-preventing installation section for preventing the sound absorbing plate from falling, the wire holders are attached to the struts adjacent to the fall-prevention installation section, and the sound absorbing parts in the fall-prevention installation section A first step of attaching each of the connecting members to a plate;
A second step of passing a wire having end fittings secured to both ends thereof through the hole of the connecting member;
A third step of supporting both ends of the wire through the through holes of the wire stoppers fixed to the columns at both ends of the fall prevention installation section;
The sound insulation wall which passes through the 4th process which pulls the both ends of the said wire to the opposite direction, and hold | maintains the end metal fitting provided in the both ends of the wire with the wire holder attached to the support | pillar of the position adjacent to the said fall prevention installation area. Construction method to prevent the sound absorbing plate from collapsing.

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