JP6803057B2 - Fixed structure of plate-shaped sound absorbing material - Google Patents

Description

The present invention relates to a fixing structure using the fixing device for fixing a plate-shaped sound absorbing material on the wall of the machine room.

Conventionally, in order to attenuate the noise generated in the machine room and reduce the noise level inside and outside, a sound absorbing material made of glass wool is attached to the wall of the machine room, and the sound generated in the machine room is absorbed by the sound absorbing material. ing. The sound absorbing material made of glass wool allows air vibrating with the energy of sound to pass through the fine voids provided between the fibers that are three-dimensionally assembled, and loses energy due to the resistance when the air passes through the gap. Let it reduce the noise level. Since the sound absorbing material made of glass wool can absorb sound energy in innumerable voids and effectively reduce the noise level, for example, in a sewerage treatment plant where a large pump is installed, it is placed on the wall surface of the machine room. , A plate-shaped sound absorbing material made of glass wool is fixed. In order to efficiently reduce the noise level in all frequency bands, it is important that the glass wool plate-shaped sound absorbing material is fixed in close contact with the concrete wall so as not to vibrate as a whole. In order to realize this, the Japan Sewage Works Agency has specified the number of fixtures for fixing the plate-shaped sound absorbing material to the concrete wall, for example, in the glass wool plate-shaped sound absorbing material having an outer shape of 910 mm × 1820 mm. Mandatory fixing to concrete walls with as many as eight fixtures.

As a fixture for fixing a plate-shaped sound absorbing material made of glass wool to a concrete wall, the fixture 90 shown in FIG. 5 has been developed and is still in use (see Patent Document 1).

Jikkenhei 01-065909

In the above fixture 90, as shown in FIGS. 6 and 7, a stainless steel plate is processed into a tubular shape to form a shaft portion 91, and a collar 92 is fixed to the rear end of the shaft portion 91. The shaft portion 91 has a tapered tip so that it can be easily inserted into a pilot hole in a concrete wall. Further, innumerable convex portions 93 are provided on the side surface of the shaft portion 91, and slits 94 extending in the longitudinal direction are provided. The fixture 90 fixes the plate-shaped sound absorbing material 40 to the concrete wall 50 as shown in FIG. 8 in the following steps.

In a state where the plate-shaped sound absorbing material 40 is laminated on the concrete wall 50, the plate-shaped sound absorbing material 40 is penetrated and a pilot hole 51 is drilled in the concrete concrete wall 50 made of concrete with a vibration drill. After that, while holding the plate-shaped sound absorbing material 40 so as not to be displaced, the fixing tool 90 is driven into the prepared hole 51 through the plate-shaped sound absorbing material 40 with a mallet to fix it.

If the plate-shaped sound absorbing material is fixed by the above steps using a conventional fixture, there is a drawback that all the fixtures cannot be fixed in a preferable state. This is because it is difficult to make a pilot hole exactly vertically in the concrete wall, and the fixture is hammered in and fixed. The inability to drill the pilot holes vertically is due to the density spots on the concrete wall. Since the concrete wall is hardened with an aggregate such as hard gravel embedded inside the cement mortar, large density spots occur between the aggregate and the hardened cement mortar. Cement mortar is a mixture of sand and cement that can be drilled smoothly. However, since the aggregate is hard, it cannot be drilled smoothly like mortar cement. Therefore, even if the drill is pressed against the concrete wall in an accurate vertical posture to start drilling, when the tip of the drill hits the aggregate, the drilling direction shifts due to the hard aggregate, and the drilled pilot hole is vertical. It will be in a state deviated from the direction. Therefore, when a field worker manually drills a pilot hole in a concrete wall using a vibrating drill, the pilot hole is not exactly perpendicular to the concrete wall and the drilling direction is relative to the concrete wall. It cannot be completely tilted.

When the fixture is driven into the inclined pilot hole to fix the plate-shaped sound absorbing material to the concrete wall, the flange fixed to the shaft of the fixture presses and fixes the surface of the plate-shaped sound absorbing material in an inclined posture. If the plate-shaped sound absorbing material is fixed in this state, the glass cloth laminated on the surface of the plate-shaped sound absorbing material becomes wrinkled and cannot be neatly fixed to the concrete wall. Further, since the collar cannot be fixed by being brought into close contact with the surface of the plate-shaped sound absorbing material in a surface contact state and uniformly pressed over a wide area, the plate-shaped sound absorbing material cannot be fixed in a state of being in close contact with the concrete wall. If the plate-shaped sound absorbing material cannot be stably fixed to the concrete wall in close contact with the concrete wall, the sound absorbing material vibrates the plate-shaped sound absorbing material, which deteriorates the sound absorbing characteristics and causes an adverse effect that the noise level in the machine room cannot be reduced efficiently. .. In order to prevent this adverse effect, if the fixture is deeply driven into the prepared hole and the collar is made to bite into the surface of the plate-shaped sound absorbing material, the wrinkles of the non-stretchable glass cloth will increase and it will not be possible to fix the glass cloth neatly.

The present invention has been made in view of the above problems. An important object of the present invention is to provide a clean fixing can Ru fixed structure while providing excellent sound absorption characteristics over a long period of time.

Means for Solving Problems and Effects of Invention

In order to solve the above problems, the fixed structure of the plate-shaped sound absorbing material of the present invention has a plate shape in which glass cloth 42 is laminated on the surface of the sound absorbing material 41 formed by collecting glass wool in a state of innumerable voids. the sound absorbing material 40 through the fixture 100 fixed to the concrete wall 50 of the machine room, a fixing structure for soundproofed machine room, flat washer fixture, which is laminated on the surface of the plate-shaped sound absorbing material 40 20 and the plate-shaped sound absorbing material 40 are inserted into the center hole 21 of the flat seat metal 20, penetrate the plate-shaped sound absorbing material 40, and the screw portion 13 at the tip is screwed into the concrete wall 50, and the plate-shaped sound absorbing material 40 is concreted through the flat seat metal 20. It is provided with a countersunk screw 10 that is fixed to the wall 50. The flat washer 20 has a flat plate ring 22 which is a flat disk, and a conical protrusion 23 which protrudes toward the plate-shaped sound absorbing material 40 at the center of the flat plate ring 22, and the conical protrusion 23 has a tip. The inner diameter of the center hole 21 is larger than the shaft diameter of the countersunk screw 10 inserted therein, the countersunk head 12 is arranged in the inner recess 24 provided inside the conical protrusion 23, and the countersunk screw 10 is a flat washer. The flat plate ring 22 is in close contact with the surface of the plate-shaped sound absorbing material 40 in a surface contact state with the countersunk screw 10 fixed to the concrete wall 50 in a non-vertical position while being tiltably connected to the plate-shaped sound absorbing material 40. Is fixed to the concrete wall 50.

In the above fixing structure of the plate-shaped sound absorbing material, even if the pilot hole of the concrete wall is perforated from the vertical posture due to the density unevenness of the concrete, a countersunk screw is screwed into the hole, and the plate-shaped sound absorbing material is used in the concrete wall. It has the feature of being able to achieve excellent absorption characteristics while being neatly fixed to the surface. The fixture used in the above fixing structure consists of a flat washer and a countersunk screw, and the flat washer is a flat washer with a flat plate ring and a plate-shaped sound absorbing material in the center of the flat washer. A conical protrusion is provided so that the inner diameter of the center hole at the tip of the conical protrusion is larger than the shaft diameter of the washer screw, and the countersunk head is arranged in the inner recess inside the conical protrusion. With the screw connected to the flat washer in a tiltable manner and the countersunk screw screwed into the pilot hole of the conical wall in a non-vertical position, the flat plate ring is in close contact with the surface of the plate-shaped sound absorbing material in a surface contact state. Is fixed to the concrete wall.

Furthermore, in the above fixed structure , a countersunk screw is screwed into a pilot hole in a non-vertical posture, and the flat plate ring is brought into close contact with the plate-shaped sound absorbing material in a surface contact state, thereby pressing the plate-shaped sound absorbing material over a wide area and concrete. In addition to being able to be securely fixed to the wall, the unique structure in which the conical protrusion of the flat washer presses the plate-shaped sound absorbing material internally also ensures that the plate-shaped sound absorbing material is fixed to the concrete wall. In particular, since the conical protrusion presses the plate-shaped sound absorbing material internally toward the concrete wall, wrinkles occur on the glass cloth on the surface of the plate-shaped sound absorbing material while securely fixing the plate-shaped sound absorbing material to the concrete wall. There is a feature that can prevent.

Further, the conical protrusion also realizes a feature that the pulling force of the glass cloth and the pressing force of the plate-shaped sound absorbing material can be controlled by adjusting the size of the hole opened in the glass cloth. As shown in FIG. 2, the position of the conical protrusion 23 inserted into the glass cloth 42 is changed by the size (D1, D2) of the opening holes 42A of the glass cloth 42, and the tensile force of the glass cloth 42 is changed. This is because the pressing force can be controlled. When the diameter of the opening hole 42A of the glass cloth 42 is reduced from D1 to D2, the glass cloth 42 is inserted into the tip of the conical protrusion 23 as shown by the chain line in FIG. The conical protrusion 23 inserted at this position pushes the opening hole 42A of the glass cloth 42 deeply into the inside of the plate-shaped sound absorbing material 40 and pulls strongly in the direction indicated by the arrow A, and the plate-shaped sound absorbing material 40 exerts a stronger pressure. Fixed to a concrete wall. On the contrary, when the opening hole 42A of the glass cloth 42 is increased from D2 to D1, the conical protrusion 23 is deeply inserted into the opening hole 42A of the glass cloth 42, and the opening hole 42A of the glass cloth 42 is formed inside the plate-shaped sound absorbing material 40. The pulling force of the glass cloth 42 in the direction of arrow A is reduced without pushing it deeply into the glass cloth 42. Therefore, the above fixing structure is characterized in that the size of the opening hole of the glass cloth can be adjusted, the pulling force of the glass cloth of the conical protrusion can be adjusted, and the pressing force for fixing the plate-shaped sound absorbing material to the concrete wall can be controlled. There is.

As the plate-shaped sound absorbing material in which the surface of glass wool is coated with glass cloth, a plurality of products having different densities of glass wool are commercially available. This plate-shaped sound absorbing material controls the sound absorbing characteristics by the density of glass wool, and the density differs depending on the sound absorbing characteristics, and the hardness differs depending on the density. The fixed structure in which the pressing force can be controlled by the opening hole of the glass cloth can be fixed to the concrete wall by controlling the pressing force of the glass cloth by the conical protrusion to the optimum value by the density and hardness of the plate-shaped sound absorbing material. For example, a high-density, hard plate-shaped sound absorbing material can increase the pressing force of the flat washer flat plate ring to securely fix the plate-shaped sound absorbing material to the concrete wall, but a low-density and flexible plate-shaped sound absorbing material can be used. When the surface is pressed with the flat plate ring, the surface is deformed and the pressing force for fixing the plate-shaped sound absorbing material to the concrete wall becomes weak. When the pressing force of the flat washer is increased in order to firmly fix the plate-shaped sound absorbing material to the concrete wall, the flat plate ring bites into the surface of the plate-shaped sound absorbing material and wrinkles the surface, so that the pressing force of the flat washer is limited. .. This plate-shaped sound absorbing material can make the opening hole of the glass cloth small and strongly press the glass cloth with the conical protrusion so that it can be securely fixed to the concrete wall.

As described above, the countersunk screw can be screwed into the pilot hole in the non-vertical posture, and the flat plate ring of the flat seat can be adhered to the surface of the plate-shaped sound absorbing material in a surface contact state and fixed to the concrete wall. The fixed structure that allows the plate-shaped sound absorbing material to be internally pressed and fixed to the concrete wall, and the pressing force of the conical protrusion to be controlled by the size of the opening hole of the glass cloth ensures that the plate-shaped sound absorbing material is fixed. While achieving excellent sound absorption characteristics by fixing to a concrete wall, it realizes excellent features that can prevent wrinkles on the surface of glass cloth and fix it neatly.

Furthermore, the fixture used in the above fixing structure is fixed by screwing instead of driving it with a mallet as in the past, so the fixture is placed in the optimum position and the plate-shaped sound absorbing material is ideal. It also realizes the feature that it can be adjusted and fixed at a comfortable pressing position. Furthermore, since the screw part is screwed into the prepared hole to fix it, the pull-out strength can be increased several times compared to the conventional fixture, so even if the plate-shaped sound absorbing material is fixed for a long period of time, the fixing force is strong. It also realizes a feature that does not loosen. Therefore, the fixing force does not decrease with time and a gap is not generated between the plate-shaped sound absorbing material and the concrete wall, and excellent sound absorbing characteristics can be maintained for a long period of time.

Furthermore, in the renovation work of the machine room, it is necessary to replace the plate-shaped sound absorbing material. In this state, the countersunk screw is rotated in the opposite direction and pulled out from the pilot hole to remove the plate-shaped sound absorbing material and re-installed. It also realizes usable features. Since the conventional fixture is fixed by driving in, damage to the plate-shaped sound absorbing material cannot be avoided when the collar is pulled out from the pilot hole, and the removed plate-shaped sound absorbing material cannot be reused effectively. However, the fixed structure of the present invention also realizes a feature that the plate-shaped sound absorbing material can be removed from the concrete wall without being damaged and can be effectively reused.

Further, the fixture used in the fixing structure of the plate-shaped sound absorbing material of the present invention is a rubber-like elastic ring 30 that is inserted through the countersunk screw 10 and arranged between the flat washer 20 and the plate-shaped sound absorbing material 40. Ru equipped with. This fixing structure is further characterized in that the plate-shaped sound absorbing material can be more reliably fixed to the concrete wall with a rubber-like elastic ring. In particular, this rubber-like elastic ring elastically presses the plate-shaped sound absorbing material inside to securely fix it to the concrete wall. This is because the rubber-like elastic ring elastically presses the glass wool inside the plate-shaped sound absorbing material or elastically presses the glass cloth to fix the plate-shaped sound absorbing material to the concrete wall. The rubber-like elastic ring also realizes the feature that the pressing force inside the plate-shaped sound absorbing material can be adjusted by changing the outer diameter. The rubber-like elastic ring is enlarged to increase the area for elastically and elastically pressing glass wool or glass cloth, thereby strengthening the adhesion to the concrete wall. Further, since the rubber-like elastic ring itself is elastically deformed and the plate-shaped sound absorbing material can be internally pressed against the concrete wall, the plate-shaped sound absorbing material is always pressed against the concrete wall to be brought into close contact with the concrete wall. The plate-shaped sound absorbing material that always adheres to the concrete wall realizes excellent sound absorbing characteristics and realizes a feature that the noise level can be further reduced.

Further, in the fixture used in the above fixing structure, the rubber-like elastic ring inserted through the countersunk screw is arranged between the flat washer and the plate-shaped sound absorbing material, so that the fixture is formed in a prepared hole drilled in the concrete wall. Even if the countersunk screw to be screwed is in an inclined state, it can be screwed in while absorbing the displacement of the countersunk screw screwed in the inclined posture by the elastically deforming rubber-like elastic ring. Therefore, even when the countersunk screw is screwed in in an inclined posture, the plate-shaped sound absorbing material can be reliably fixed to the concrete wall in a pressed state by the rubber-like elastic ring that deforms along the countersunk screw.

Further, the fixture used in the fixing structure of the plate-shaped sound absorbing material of the present invention is provided with a pressing ring 25 in which the conical protrusion 23 projects toward the rubber-like elastic ring 30 along the peripheral edge of the center hole 21. be able to. This fixed structure also realizes a feature that the pressing force of the rubber-like elastic ring can be controlled by adjusting the vertical width of the pressing ring, that is, the axial length of the countersunk screw and the outer diameter. This is because the vertical width of the pressing ring can be increased and the rubber-like elastic ring can be placed at a position where it bites deeper into the plate-shaped sound absorbing material, so that the pressing force of the plate-shaped sound absorbing material by the rubber-like elastic ring can be increased. is there. Therefore, even in a plate-shaped sound absorbing material having a low density, this fixed structure has a flexible plate-shaped sound absorbing material due to the pressing pressure of the rubber-like elastic ring that bites into the inside of the plate-shaped sound absorbing material in addition to the pressing force of the flat plate ring. It has the feature that the material can be firmly attached to the concrete wall without any gaps.

Further, in the fixture used in the fixing structure of the plate-shaped sound absorbing material of the present invention, the outer diameter of the rubber-like elastic ring 30 can be made larger than 1.5 times the outer diameter of the pressing ring 25. In this fixed structure , the pressing ring bites into the plate-shaped sound absorbing material and presses the plate-shaped sound absorbing material over a wide area to increase the pressing force of the plate-shaped sound absorbing material on the concrete wall, and more ideally the plate. It has the feature that the sound absorbing material can be adhered to the concrete wall to improve the sound absorbing characteristics.

Furthermore, in the fixing structure of the plate-shaped sound absorbing material of the present invention, the inner recess 24 can be tapered along the countersunk head 12 or spherical. In this fixed structure , the countersunk head can be tiltably guided to the tapered or spherical inner recess, and the plate-shaped sound absorbing material can be stably pressed by the flat plate ring of the flat washer.

Further, in the fixing structure of the plate-shaped sound absorbing material of the present invention, the plate-shaped sound absorbing material 40 formed by laminating a glass cloth 42 on the surface of the sound absorbing material 40 formed by collecting glass wool 41 in a state of innumerable voids is fixed. It is a fixing structure of a plate-shaped sound absorbing material that is fixed to the wall of the machine room via 100 to perform soundproofing treatment on the machine room, and the fixture 100 is a flat sheet metal 20 laminated on the surface of the plate-shaped sound absorbing material 40. , Inserted into the center hole 21 of the flat sheet metal 20, penetrated the plate-shaped sound absorbing material 40, the screw portion 26 at the tip was screwed into the concrete wall, and the plate-shaped sound absorbing material 40 was passed through the flat sheet metal 20 to the concrete wall 45. The flat sheet metal 20 has a conical projecting portion 23 projecting toward the plate-shaped sound absorbing material 40 at the center of the flat plate ring 22, and the conical projecting portion 23 is at the center of the tip. The inner diameter of the hole 21 is larger than the shaft diameter of the countersunk screw 10 inserted therein, and the countersunk head 12 is arranged in the inner recess 24 provided inside the conical protrusion 23, and the countersunk screw 12 becomes the flat seat 20. With the countersunk screws 12 fixed to the concrete wall 50 in a non-vertical position while being tiltably connected, the flat plate ring 22 is in close contact with the surface of the plate-shaped sound absorbing material 40 in a surface contact state, and the plate-shaped sound absorbing material 40 is made of concrete. It is fixed to the wall 50.

In the above fixing structure of the plate-shaped sound absorbing material, even if the pilot hole of the concrete wall is perforated from the vertical posture due to the density unevenness of the concrete, a countersunk screw is screwed into the hole, and the plate-shaped sound absorbing material is used in the concrete wall. It has the feature of being able to achieve excellent absorption characteristics while being neatly fixed to the surface. The above fixing structure comprises a fixture composed of a flat washer and a countersunk screw, and the flat washer is provided with a conical protrusion protruding toward the plate-shaped sound absorbing material at the center of the flat washer. , Make the inner diameter of the center hole at the tip larger than the shaft diameter of the countersunk screw, place the countersunk head in the inner recess inside the conical protrusion, and connect the countersunk screw to the flat washer in a tiltable manner, and do not connect the countersunk screw. This is because the flat plate ring is brought into close contact with the surface of the plate-shaped sound absorbing material in a surface contact state and the plate-shaped sound absorbing material is fixed to the concrete wall in a state of being screwed into the pilot hole of the concrete wall in a vertical posture.

Furthermore, in the above fixed structure, a countersunk screw is screwed into a pilot hole in a non-vertical posture, and the flat plate ring is brought into close contact with the plate-shaped sound absorbing material in a surface contact state, thereby pressing the plate-shaped sound absorbing material over a wide area and concrete. In addition to being able to be securely fixed to the wall, the plate-shaped sound absorbing material can be more reliably fixed to the concrete wall due to the unique structure in which the conical protrusion of the flat washer presses the plate-shaped sound absorbing material internally. In particular, since the conical protrusion presses the plate-shaped sound absorbing material internally toward the concrete wall, wrinkles occur on the glass cloth on the surface of the plate-shaped sound absorbing material while securely fixing the plate-shaped sound absorbing material to the concrete wall. There is a feature that can prevent.

Furthermore, since the above fixing structure is fixed by screwing instead of driving it with a mallet as in the past, the fixture is placed in the optimum position and the plate-shaped sound absorbing material is adjusted to the ideal pressing position. It also realizes a feature that can be fixed. Furthermore, since the screw part is screwed into the prepared hole to fix it, the pull-out strength of the fixture can be increased several times compared to the conventional fixing structure, and even if the plate-shaped sound absorbing material is fixed for a long period of time, it is fixed. It also realizes the feature that the force does not loosen. Therefore, the fixing force does not decrease with time and a gap is not generated between the plate-shaped sound absorbing material and the concrete wall, and a feature that excellent sound absorbing characteristics can be maintained for a long period of time is also realized.

Furthermore, in the renovation work of the machine room, it is necessary to replace the plate-shaped sound absorbing material. In this state, the countersunk screw is rotated in the opposite direction and pulled out from the pilot hole to remove the plate-shaped sound absorbing material and re-installed. It also realizes usable features. Since the conventional fixing structure is fixed by driving in, damage to the plate-shaped sound absorbing material cannot be avoided when the collar is pulled out from the pilot hole, and the removed plate-shaped sound absorbing material cannot be effectively reused. However, the fixed structure of the present invention also realizes a feature that the plate-shaped sound absorbing material can be removed from the concrete wall without being damaged and can be effectively reused.

It is a partial side sectional view which shows the fixed structure of the plate-shaped sound absorbing material which concerns on one Embodiment of this invention. It is an enlarged sectional view of the fixed structure of the plate-shaped sound absorbing material shown in FIG. It is an enlarged cross-sectional view which shows the state which the fixture of the fixed structure is fixed to the inclined pilot hole. It is an enlarged perspective view which shows the screw part of the fixture of the fixing structure shown in FIG. It is a side view which shows the fixture of the conventional plate-shaped sound absorbing material. It is a vertical sectional view of the fixture shown in FIG. It is a bottom view of the fixture shown in FIG. It is sectional drawing which shows the use state of the fixture shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are examples for embodying the technical idea of the present invention, and the present invention is not specified as the following. In addition, the present specification does not specify the members shown in the claims as the members of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention to the specific description unless otherwise specified, and are merely explanatory examples. Only. The size and positional relationship of the members shown in each drawing may be exaggerated to clarify the explanation. Further, in the following description, parts having the same name and the same reference numerals are shown, and detailed description thereof will be omitted as appropriate. Further, each element constituting the present invention may be configured such that a plurality of elements are composed of the same member and the plurality of elements are combined with one member, or conversely, the function of one member is performed by the plurality of members. It can also be shared and realized.

The fixture used in the fixing structure of the present invention is used as a member for fixing a plate-shaped sound absorbing material to a concrete wall of a machine room having a large noise level such as a sewerage treatment plant. The plate-shaped sound absorbing material absorbs the noise in the machine room and lowers the noise level in the room and outdoors. As shown in FIG. 1, the fixture used in the fixing structure of the embodiment shown below is formed by laminating a glass cloth 42 on the surface of a sound absorbing material 41 formed by collecting glass wool in a state of having innumerable voids. The plate-shaped sound absorbing material 40 is fixed to the surface of the concrete wall 50.

The fixture 100 shown in FIGS. 1 and 2 includes a flat washer 20 laminated on the surface of the plate-shaped sound absorbing material 40, and a countersunk screw 10 inserted into the center hole 21 of the flat washer 20. Further, the fixture 100 includes a rubber-like elastic ring 30 in order to fix the plate-shaped sound absorbing material 40 to the concrete wall 50 in a more ideal state. The rubber-like elastic ring 30 is inserted through the countersunk screw 10 and is arranged between the flat washer 20 and the surface of the plate-shaped sound absorbing material 40.

(Flat washer 20)
The flat washer 20 shown in FIGS. 1 and 2 is provided with a conical protrusion 23 projecting toward the plate-shaped sound absorbing material 40 at the center of the flat plate ring 22. The flat plate ring 22 is a flat disk, which is in close contact with the surface of the plate-shaped sound absorbing material 40 in a surface contact state, and fixes the plate-shaped sound absorbing material 40 to the concrete wall 50 in a pressed state. The flat plate ring 22 has a large outer diameter and presses the surface of the plate-shaped sound absorbing material 40 over a wide area to fix the plate-shaped sound absorbing material 40 to the concrete wall 50. Therefore, the outer diameter of the flat plate ring 22 is, for example, 1 cm or more, preferably 1.5 cm or more, and optimally about 3 cm.

The flat washer 20 is manufactured by cutting a metal plate such as iron or alloy and pressing it. The conical protrusion 23 of the flat washer 20 is provided by pressing a metal plate. The conical protrusion 23 has a central hole 21 provided at the tip thereof. The inner diameter of the center hole 21 is larger than the diameter of the shaft portion 11 of the countersunk screw 10 inserted therein, and the countersunk head 12 of the countersunk screw 10 is arranged in the inner recess 24 provided inside the conical protrusion 23. The countersunk screw 10 is arranged so that it can be tilted with respect to the flat washer 20. In the flat washer 20, the inner diameter of the center hole 21 is 1.5 to 2.5 times the outer diameter of the shaft portion 11 of the countersunk screw 10, and the countersunk screw 10 can be tiltably arranged with respect to the flat washer 20.

In the countersunk screws 10 of FIGS. 1 and 2, the inner recess 24 inside the conical protrusion 23 is tapered along the countersunk head 12. The conical protrusion 23 can guide the countersunk head 12 of the countersunk screw 10 along the inner surface. In particular, the countersunk screw 10 screwed into the prepared hole 51 drilled vertically in the concrete wall 50 has the flat plate ring 22 evenly attached to the plate-shaped sound absorbing material 40 while the countersunk head 12 is in close contact with the inner surface of the inner recess 24. Can be pressed against the surface of. However, in the present specification, the conical protrusion is not necessarily specified as an accurate conical shape, and is used to include a spherical shape in which the countersunk head can be guided to the inner concave portion. This is because the plate-shaped sound absorbing material can be fixed to the concrete wall via the flat washer by guiding the countersunk head to the spherical inner recess.

The conical protrusion 23 is provided with a pressing ring 25 that protrudes toward the rubber-like elastic ring 30 along the peripheral edge of the center hole 21. The pressing ring 25 presses the rubber-like elastic ring 30. The pressing ring 25 has a cylindrical shape, and its height (H) specifies the position of the rubber-like elastic ring 30, to be exact, the axial position of the countersunk screw 10. The height (H) of the pressing ring 25 is increased, that is, the height (H) is increased, the rubber-like elastic ring 30 is pushed down further, and the rubber-like elastic ring 30 is pushed down inside the plate-shaped sound absorbing material 40. The rubber-like elastic ring 30 pushed down inside the plate-shaped sound absorbing material 40 bites into the inside of the plate-shaped sound absorbing material 40, and the elastic pressing force for pressing the plate-shaped sound absorbing material 40 against the concrete wall 50 becomes stronger. Therefore, the height (H) of the pressing ring 25 is such that the rubber-like elastic ring 30 presses the plate-shaped sound absorbing material 40 with the optimum elastic pressing force, for example, 1 mm or more and 5 mm or less, and optimally about 2 mm. Set.

Further, the flat washers 20 of FIGS. 1 and 2 are provided with a bank portion 26 projecting to the front side along the boundary between the flat plate ring 22 and the conical projecting portion 23. The bank portion 26 is provided on the outer peripheral edge of the inner recess 24, and the countersunk head 12 that guides the inner recess 24 is arranged inside the surface including the top surface 26A of the bank portion 26. As shown in FIG. 3, the inner recess 24 provided with the bank portion 26 on the outer peripheral edge guides the countersunk head 12 of the countersunk screw 10 screwed into the concrete wall 50 in a non-vertical posture, and makes the countersunk head 12 the bank portion. It can be guided to the inner recess 24 so as not to protrude from 26. Since the flat washer 20 does not project the countersunk head 12 of the countersunk screw 10 screwed in in a non-vertical posture, it is not necessary to deepen the inner recess 24, in other words, to increase the protruding dimension (L) of the conical protrusion 23. The inner recess 24 is shaped so that the countersunk head 12 of the countersunk screw 10 screwed in the vertical posture does not protrude, and the countersunk head 12 of the countersunk screw 10 screwed in the non-vertical posture can be guided by the bank portion 26 so as not to protrude.

The flat washers 20 of FIGS. 1 and 2 have an inverted U-shape in the cross-sectional shape of the bank portion 26. Since the flat washer 20 guides the countersunk head 12 inside the protruding bank portion 26, the acute-angled corner portion of the countersunk head 12 is arranged inside. Since the corner portion of the countersunk head 12 is sharply pointed, if the plate-shaped sound absorbing material 40 is fixed and protrudes from the inner recess 24 of the flat washer 20, the surface of the flat washer 20 cannot be finished smoothly. The flat washer 20 in the figure has an inverted U-shaped cross section of the bank portion 26 and guides the countersunk head 12 inward so as not to protrude from the bank portion 26, so that the flat washer 20 is screwed into the concrete wall 50 in a non-vertical posture. The surface of the flat washer 20 can be smoothly finished in a fixed state without projecting the countersunk head 12 of the countersunk screw 10. Further, since the flat washer 20 does not project the countersunk head 12 of the countersunk screw 10 from the flat washer 20, the appearance is spoiled in the fixed state, or a person or an object is caught by the protruding countersunk head 12, resulting in injury or damage to the article. It is possible to reduce the risk of leading to.

(Plate screw 10)
As shown in FIGS. 1 and 2, the countersunk screw 10 is provided with a countersunk head 12 at the rear end of the shaft portion 11 and a screw portion 13 at the tip end of the shaft portion 11. The shaft portion 11 has a threaded portion 13 at the tip and a cylindrical portion 14 without threads 15 at the rear end. The countersunk head 12 has a conical shape, and a + groove or a-groove is provided on the tip surface for connecting an electric screwdriver. In the shaft portion 11, a portion screwed into the prepared hole 51 of the concrete wall 50 is a threaded portion 13, and a portion penetrating the plate-shaped sound absorbing material 40 is a cylindrical portion 14 without threads 15.

The screw portion 13 is provided with a screw thread 15 protruding from the surface in a spiral shape. The countersunk screw 10 of FIG. 1 has a large screw thread 15A and a small screw thread as shown in FIG. 4 in order to smoothly screw the screw portion 13 into the prepared hole 51 of the concrete wall 50 and realize sufficient pull-out strength. Two rows of threads 15 of 15B are provided in a spiral shape. The machine threads 15B are provided between the large threads 15A, and two rows of threads 15 are provided at equal intervals. The countersunk screw 10 is fixed by directly screwing the screw portion 13 into the prepared hole 51 of the concrete wall 50. A tubular spacer (not shown) is inserted into the prepared hole 51, and the countersunk screw 10 is inserted into this spacer. It can also be screwed in and fixed.

As shown in FIG. 4, the threaded portions 13 screwed into the prepared holes 51 of the concrete wall 50 are notched at regular intervals along the top portion of the threaded thread 15, that is, the outer peripheral edge of the threaded thread 15. 16 can be provided to prevent the screws from loosening. In this countersunk screw 10, while the countersunk screw 10 is screwed into the concrete wall 50, the cut portion 16 of the screw thread 15 is caught on the inner surface of the prepared hole 51 and does not loosen, and the plate-shaped sound absorbing material 40 is securely attached to the concrete wall 50 for a long period of time. Can be fixed to.

(Rubber elastic ring 30)
The rubber-like elastic ring 30 is inserted into the shaft portion 11 of the countersunk screw 10, is arranged between the flat washer 20 and the plate-shaped sound absorbing material 40, and is pressed by the pressing ring 25 at the tip of the conical protrusion 23 to form a plate shape. The sound absorbing material 40 is fixed to the concrete wall 50 in a pressed state. The rubber-like elastic ring 30 is formed by molding a synthetic rubber such as silicon rubber or a rubber-like elastic body such as natural rubber into a tubular shape. As shown in the enlarged cross-sectional view of FIG. 2, the rubber-like elastic ring 30 is pressed by the pressing ring 25 provided at the tip of the conical protrusion 23, and the inside of the plate-shaped sound absorbing material 40 is elastically formed on the concrete wall 50. Press. The rubber-like elastic ring 30 has a large outer diameter and elastically presses the inside of the plate-shaped sound absorbing material 40 against the concrete wall 50. Therefore, the outer diameter of the rubber-like elastic ring 30 is 1.5 times or more, preferably 2 times or more, more preferably 3 times or more the outer diameter of the shaft portion 11. The rubber-like elastic ring 30 elastically presses the surface of the glass wool sound absorbing material 41 inside the plate-shaped sound absorbing material 40, or elastically presses the surface of the glass cloth 42 on the surface of the plate-shaped sound absorbing material 40. 40 is pressed against the concrete wall 50.

As shown in FIG. 1, the fixture 100 used in the above fixing structure has a plate-shaped sound absorbing material by penetrating a countersunk screw 10 through a plate-shaped sound absorbing material 40 and screwing a screw portion 13 into a pilot hole 51 of a concrete wall 50. The material 40 is fixed to the concrete wall 50. The fixture 100 adheres the flat plate ring 22 of the flat washer 20 to the surface of the plate-shaped sound absorbing material 40 in a surface contact state, which presses the plate-shaped sound absorbing material 40 from the surface and fixes it to the concrete wall 50. As shown in the enlarged cross-sectional view of FIG. 2, the flat plate ring 22 is fixed to the concrete wall 50 by elastically pressing the plate-shaped sound absorbing material 40 in a state of being slightly pushed inward from the surface of the plate-shaped sound absorbing material 40. To do. In this state, the conical protrusion 23 of the flat washer 20 is pushed into the plate-shaped sound absorbing material 40, and the glass cloth 42 on the surface is pulled and fixed in the direction indicated by the arrow A. The conical protrusion 23 fixes the plate-shaped sound absorbing material 40 to the concrete wall 50 by controlling the pulling force at the position where the glass cloth 42 is inserted, that is, the size of the opening hole 42A of the glass cloth 42. The conical protrusion 23 is pushed into a part of the plate-shaped sound absorbing material 40 to elastically press the plate-shaped sound absorbing material 40 against the concrete wall 50, and further, the glass cloth 42 is fixed in a pulled state to fix the plate-shaped sound absorbing material 40 in a pulled state. 40 is more securely fixed to the concrete wall 50.

Further, in the fixture 100 provided with the rubber-like elastic ring 30 shown in FIG. 2, the rubber-like elastic ring 30 is pushed into the plate-like sound absorbing material 40 by the conical protrusion 23, and the rubber-like elastic ring 30 is elastically deformed. The plate-shaped sound absorbing material 40 is elastically fixed to the concrete wall 50 in a pressed state. The rubber-like elastic ring 30 does not pass through the opening hole 42A of the glass cloth 42 as shown by the thick chain line in FIG. 2, or does not pass through the opening hole 42B of the glass cloth 42 as shown by the thin chain line in FIG. The plate-shaped sound absorbing material 40 is fixed to the concrete wall 50 with the glass cloth 42 elastically pulled. As shown by the thick chain line in FIG. 2, the rubber-like elastic ring 30 passing through the opening hole 42A of the glass cloth 42 comes into contact with the inner surface of the conical protrusion 23 and is pulled by the conical protrusion 23 to form a plate-shaped sound absorbing material 40. Is fixed to the concrete wall 50. As shown by the thin chain line in FIG. 2, the rubber-like elastic ring 30 that does not pass through the opening hole 42B of the glass cloth 42 elastically pulls the glass cloth 42 located on the lower surface to form the plate-shaped sound absorbing material 40 into the concrete wall 50. Fixed to. The rubber-like elastic ring 30 that pulls the glass cloth 42 on the lower surface is greatly elastically deformed and strongly pulls the glass cloth 42 to fix the plate-shaped sound absorbing material 40 in an elastically pressed state, as shown by a thin chain line.

As shown in FIG. 1, the pilot holes 51 are drilled using a vibrating drill so as to be in an exact vertical position with respect to the concrete wall 50, but all the pilot holes 51 can be drilled in a vertical position. Can not. This is because hard aggregates are scattered inside the concrete wall 50, which deviates the direction of drilling the prepared hole 51. FIG. 3 shows a portion of the countersunk head 12 of the countersunk screw 10 screwed into the inclined pilot hole 51. As shown in this figure, the inclined countersunk screw 10 guides the countersunk head 12 to the inner recess 24 of the conical protrusion 23 in an inclined posture. The countersunk head 12 guided to the inner recess 24 in an inclined posture is arranged inside the plane including the top surface 26A of the bank portion 26, and presses the conical protrusion 23 toward the plate-shaped sound absorbing material 40 to form a plate. The sound absorbing material 40 is fixed to the concrete wall 50. The countersunk head 12 is arranged inside the inner recess 24 in an inclined posture, and the countersunk screw 10 is connected to the flat washer 20 in an inclined posture. Therefore, the flat plate ring 22 of the flat washer 20 is in close contact with the surface of the plate-shaped sound absorbing material 40 in a surface contact state, and the plate-shaped sound absorbing material 40 is fixed to the concrete wall 50. The rubber-like elastic ring 30 inside is elastically deformed and elastically presses the inside of the plate-shaped sound absorbing material 40 to fix the plate-shaped sound absorbing material 40 to the concrete wall 50.

The fixed structure of the plate-shaped sound absorbing material of the present invention is neatly fixed to the concrete wall of the machine room while realizing excellent sound absorbing characteristics, and the noise level leaking to the machine room and the outside is lowered to reduce the noise level leaking to the machine room and the outside, such as in a sewage treatment plant. Effectively used in the machine room.

100 ... Fixing tool 10 ... Countersunk screw 11 ... Shaft part 12 ... Countersunk head 13 ... Screw part 14 ... Cylindrical part 15 ... Thread 15A ... Large screw thread 15B ... Machine screw thread 16 ... Notch 20 ... Flat washer 21 ... Center Hole 22 ... Flat plate ring 23 ... Conical protrusion 24 ... Inner recess 25 ... Pressing ring 26 ... Bank 26A ... Top surface 30 ... Rubber elastic ring 40 ... Plate-shaped sound absorbing material 41 ... Sound absorbing material 42 ... Glass cloth 42A ... Opening hole 42B ... Opening hole 50 ... Concrete wall 51 ... Pilot hole 90 ... Fixture 91 ... Shaft 11
92 ... Tsuba 93 ... Convex 94 ... Slit

Claims (4)

The machine room is soundproofed by fixing the plate-shaped sound absorbing material, which is made by laminating glass cloth on the surface of the sound absorbing material, which is made by collecting glass wool with innumerable voids, to the concrete wall of the machine room via a fixture. It is a fixed structure of a plate-shaped sound absorbing material.
The fixture
A flat washer laminated on the surface of the plate-shaped sound absorbing material,
A countersunk screw that is inserted into the center hole of the flat washer, penetrates the plate-shaped sound absorbing material, and the threaded portion at the tip is screwed into the concrete wall to fix the plate-shaped sound absorbing material to the concrete wall via the flat washer. and,
It is provided with a rubber-like elastic ring that is inserted through the countersunk screw and is arranged between the flat washer and the plate-shaped sound absorbing material .
The flat washer has a flat plate ring that is a flat disk, and a conical protrusion that protrudes toward the plate-shaped sound absorbing material at the center of the flat plate ring.
The inner diameter of the center hole at the tip of the conical protrusion is larger than the shaft diameter of the countersunk screw inserted therein, and the countersunk head is arranged in the inner recess provided inside the conical protrusion, and the countersunk screw is provided. Is tiltably connected to the flat washer,
In a state where the countersunk screw is fixed to the concrete wall in a non-vertical posture, the flat plate ring is brought into close contact with the surface of the plate-shaped sound absorbing material in a surface contact state to fix the plate-shaped sound absorbing material to the concrete wall. Fixed structure of plate-shaped sound absorbing material. The fixed structure of the plate-shaped sound absorbing material according to claim 1 .
A fixed structure of a plate-shaped sound absorbing material having a pressing ring in which the conical protrusion protrudes toward the rubber-like elastic ring along the peripheral edge of the center hole. The fixed structure of the plate-shaped sound absorbing material according to claim 2 .
A fixed structure of a plate-shaped sound absorbing material, wherein the outer diameter of the rubber-like elastic ring is 1.5 times or more the outer diameter of the pressing ring. The fixed structure of the plate-shaped sound absorbing material according to any one of claims 1 to 3 .
A fixed structure of a plate-shaped sound absorbing material, wherein the inner recess has a tapered shape along the countersunk head or a spherical shape for guiding the countersunk head.

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