JP2012012829A - Ceiling structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling structure of a building capable of effectively inhibiting both light-weight and heavy-weight flooring impact sounds, reducing construction costs and being environmentally conscious by eliminating the disposal of a damper.SOLUTION: The ceiling structure comprises a plurality of first joist receivers 3 suspended and supported via anti-vibration suspenders 2 for reducing the light weight floor impact sound by the floor beam members 1 of the upper story of the building, a plurality of second joist receivers 4 arranged in approximately parallel to the first joist receivers 3 without being suspended and supported by the floor beam members 1, a plurality of joists 5 attached to the under side of the joist receivers 3 and 4, and a ceiling plate 8 attached to the under side of the joists 5. Dynamic dampers 30 for reducing heavy weight floor impact sound are previously built in only the second joist receivers 4. Several kinds of the second joist receivers 4 different in length are arranged while being selectively organized according to the shape and size of the ceiling surface.

Description

  The present invention relates to a ceiling structure of a building such as a house or an apartment.

  Conventionally, in order to reduce the floor impact sound propagating from the upper floor to the lower floor of the house, for example, a method of increasing the surface density of the floor board of the upper floor or the ceiling board of the lower floor has been adopted. However, in this case, a great burden is imposed on the structural frame with a great deal of weight.

  Therefore, in order to reduce the floor impact sound without imposing a heavy burden on the structural frame, the ceiling base material is suspended and supported on the floor beam of the upper floor via the anti-vibration hanger (see, for example, Patent Document 1). Various measures have been taken such as incorporating a dynamic damper in the ceiling base material (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 5-61311 JP 2006-342580 A

  In general, floor impact sounds include light floor impact sounds caused by medium and high frequency vibrations that occur when objects are dropped or chairs are dragged, etc., and low noise that occurs when children run around or jump. There is heavy floor impact sound caused by vibrations in the frequency range. As a countermeasure against floor impact noise, it is required to effectively suppress both the lightweight floor impact sound and the heavy floor impact sound. However, in the above countermeasure, either the lightweight floor impact sound or the heavy floor impact sound is required. In many cases, it is effective only for one, and such a request could not be fully answered.

  Further, the measures using the anti-vibration hanger have a problem that the ceiling plate on the lower floor becomes easy to be bent due to an increase in the amount of creep deformation due to the secular deterioration of the anti-vibration rubber and the like, and a partial sag occurs. However, little consideration was given to such partial sag of the ceiling panel.

  Furthermore, in the countermeasure using the dynamic damper, it is necessary to disperse a relatively large number of dynamic dampers over the entire ceiling in order to improve the sound insulation performance. For this reason, in the structure disclosed in Patent Document 2, for example, a field damper having a relatively high rigidity disposed over the entire ceiling is used, and a dynamic damper is incorporated in these field receivers. In this case, a fixed-length field receiver with a plurality of dynamic dampers installed in advance is carried to the site, and the field receiver with dynamic damper is processed to a length corresponding to the shape and size of the ceiling surface at the site. In many cases, installation is performed with (cut adjustment) to eliminate the work of assembling the dynamic damper at the site and improve workability. However, when processing the edge holder with a dynamic damper in this way (cut adjustment), the cut off end material (excess part) has no other use and can be discarded even if an expensive dynamic damper is incorporated. Inevitably, there was a problem that waste was increased and construction costs were likely to increase. Moreover, if a dynamic damper that is difficult to regenerate by adhering an elastic body made of synthetic rubber and a metal mass body is discarded, there is a problem that it is not preferable in terms of environment.

  The present invention solves the above-mentioned problems, can effectively suppress both the lightweight floor impact sound and the heavy floor impact sound, and maintains a good construction state in which the ceiling board is partially suspended and the like. The purpose of the present invention is to provide a ceiling structure of a building that can reduce the waste of materials, reduce the construction cost, and consider the environment.

  In order to solve the above-mentioned problems, the ceiling structure of a building according to the present invention includes a plurality of suspension structures supported by hanging on a floor beam material 1 on the upper floor of the building via a vibration-proof suspension 2 for reducing a light floor impact sound. A plurality of second field edge receivers 4 arranged substantially parallel to the first field edge receivers 3 without being supported by being suspended from the floor beam material 1. .. and a plurality of fields attached to the lower side of the first and second field edge receivers 3, 4... So as to be substantially orthogonal to the first and second field edge receivers 3, 4. And a ceiling plate 8 attached to the lower side of the field edges 5... Of the first and second field edge receivers 3, 4. In addition, a dynamic damper 30 for reducing heavy-weight floor impact noise is pre-installed, and several types of second field edge receivers 4 with different lengths are provided with the shape and size of the ceiling surface. Characterized by being arranged with selectively combined in accordance with the.

  Further, the first and second wall edges 7, which are fixed to the building inner wall 6 so as to be substantially orthogonal to the first and second field edge receivers 3, 4. The end of the field edge receiver 3 is installed on the edge of the wall 7 and the edge of the second field receiver 4 facing the inner wall 6 is connected to the edge 7 of the wall. .. spaced apart from

  Further, a plurality of second field edge receiving rows 4A,..., Which are arranged in a horizontal row while ensuring a gap S1 between their end portions, are provided as the first field edge receiving 3 .. are arranged substantially parallel to each other with a spacing in a direction substantially orthogonal to the second gap receiving row 4A... And the gap S1. On the other hand, they are arranged in a zigzag pattern so as not to be aligned on a straight line that is substantially perpendicular to the line.

  Furthermore, the dynamic dampers 30 ·· in the second field edge receivers 4 ·· are arranged in the vicinity of the intersection between the second field edge receivers 4 ·· and the field edges 5 ··.

  Further, by adjusting the number of the second field edge receivers 4... And increasing or decreasing the number of the dynamic dampers 30..., The sound insulation performance against the heavy floor impact sound can be adjusted.

  Further, the dynamic damper 30 is formed by combining a mass body 31 and an elastic body 32, and the mass body 31 is elastically supported by the elastic body 32 so that the second field edge receiver 4 has a height dimension within the height. It is mounted in a state of overhanging in a horizontal direction so that it fits in.

  In the ceiling structure of the present invention, the lightweight floor impact sound propagating from the upper floor to the lower floor can be reduced mainly by the anti-vibration suspension, and the heavy floor impact sound propagating from the upper floor to the lower floor can be reduced. The dynamic damper incorporated in the second field rim can be reduced intensively, and both the lightweight floor impact sound and the heavy floor impact sound can be effectively suppressed.

  Moreover, in addition to the general first field edge support that is suspended and supported by the floor beam material, a second field edge support that is not suspended and supported by the floor beam material is provided separately. The rigidity of the part can be increased. As a result, it is possible to suppress the bending of the ceiling plate, which is caused by the creep deformation of the anti-vibration rubber in these anti-vibration suspensions even though the anti-vibration suspensions are used to take measures against lightweight floor impact noise. It is possible to prevent the ceiling plate from partially hanging down and maintain a good construction state for a long time.

  In addition, the dynamic damper is pre-installed only in the second field receiver, so that the first field receiver that is forced to perform on-site processing (cut adjustment) must not be assembled. Regarding the 2nd field edge receiver, by arranging several types of different lengths selectively combined according to the shape and size of the ceiling surface, the on-site processing (cut adjustment) is minimized. Therefore, it is not necessary to discard expensive and difficult-to-regenerate dynamic dampers, so that construction costs can be reduced and environmental aspects can be taken into consideration.

  Further, when the second field edge receiver is combined and arranged, the end of the second field edge receiver facing the inner wall of the building is arranged in a state of being separated from the edge of the wall, and the end of the second field edge receiver A gap is secured between the edge of the wall. Further, in each second field receiving row, a gap is secured between the end portions of the second field receiving arranged in a horizontal row. As a result, when floor impact sound propagates from the upper floor to the lower floor, the interference between the second field edge oscillating and the field edge near the wall, the interference between the ends of the second field edge oscillating, is eliminated. Generation of abnormal noise such as rubbing noise can be prevented, and not only floor impact noise countermeasures but also abnormal noise countermeasures can be fully considered. In addition, by securing such a gap, the second field edge receiver can be arranged flexibly, and even if there is some dimensional error or construction error, the second field edge receiver can be arranged without any problem. It is possible to improve the workability.

  Furthermore, in each second field receiving row, a gap is provided between the end portions of the second field receiving rows arranged in a horizontal row, so that a defect occurs in an intermediate portion of each second field receiving row. (Although the continuity of the second field edge receivers will be impaired), the gaps of these second field edge receiver rows are staggered so as not to be aligned on a straight line substantially perpendicular to the first field edge receivers. Since it is dispersedly arranged, it is possible to prevent a problem that the ceiling board is easily bent along a straight line.

  In addition, the vicinity of the intersection between the second field edge receiver and the field edge is highly rigid and distributed over the entire ceiling, and the dynamic damper incorporated in the second field edge receiver near such an intersection. By disposing, the effect of reducing the heavy floor impact sound by the dynamic damper can be effectively utilized over the entire ceiling, and the sound insulation performance against the heavy floor impact sound can be further improved.

  Furthermore, the number of dynamic dampers installed can be reduced by adjusting the number of second field receivers that are not supported by suspension and the number of second field receivers that are not supported by suspension. Since the sound insulation performance against the heavy floor impact sound can be adjusted by increasing / decreasing the sound insulation performance, it is possible to easily adjust the sound insulation performance without any significant design change.

  Furthermore, by installing the dynamic damper on the second field edge so as to be horizontally extended so as to be within the height dimension, the dynamic damper is obstructed when constructing piping and heat insulating materials in the underfloor space. Can be avoided.

It is a principal part perspective view of the ceiling structure of the building which concerns on one Embodiment of this invention. It is the partial expansion perspective view similarly. It is the schematic plan view similarly. It is a schematic plan view which similarly shows the wall edge part. It is the longitudinal cross-sectional view of the vibration isolator vicinity similarly. Similarly, it is a front view of the vicinity of the anti-vibration hanger. It is a disassembled perspective view of the damper mounting part of the 2nd field edge receiver similarly. It is a figure which similarly shows the kind of the 2nd field receiver. It is an exploded perspective view of the attachment part of the field edge similarly. It is the longitudinal cross-sectional view of the edge part vicinity of the 1st field edge receiver similarly. It is a perspective view of the edge part vicinity of the 2nd field edge receiver similarly. It is the longitudinal cross-sectional view of the runner vicinity similarly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The ceiling structure according to an embodiment of the present invention is applied to, for example, a lightweight steel-framed detached house. As shown in FIGS. 1 to 4, the ceiling structure is suspended and supported by a floor beam material 1 on the upper floor via a plurality of vibration-proof suspensions 2 for reducing lightweight floor impact sound. A plurality of first field receivers 3 arranged substantially parallel to each other, and arranged substantially parallel to the first field receiver 3 without being supported by hanging on the floor beam material 1. The plurality of second field edge receivers 4... And the first and second field edge receivers 3, 4. A plurality of field edges 5 fixed to the inner wall 6 of the building so as to be substantially orthogonal to the plurality of field edges 5 attached to the lower side of the first and second field edge receivers 3, 4. 7 and a ceiling plate 8 made of gypsum board or the like attached to the lower side of the field edge 5 and the wall edge 7.

  In the figure, floor beams made of H-shaped steel are used as the floor beam materials 1... However, they may be beam ties made of groove-shaped steel passed between the floor beams. Further, as the ceiling plate 8, a laminate of two plaster boards is used.

  As shown in FIGS. 2, 5, and 6, the vibration isolator 2 includes a beam mounting member 10 that is mounted on the floor beam material 1 and a compression-type vibration-proof rubber 11 that is mounted on the beam mounting member 10. And a suspension bolt 12 that is supported by the anti-vibration rubber 11 and connected to the first field edge receiver 3.

  The beam mounting member 10 is formed by bending a steel plate, and has a substantially groove shape with an open portion facing upward. The bottom surface portion 15 is a mounting portion for mounting the anti-vibration rubber 11, and the pair of side surface portions 16, 16 rising from both side ends of the bottom surface portion 15 are engaging portions for engaging the floor beam material 1. Yes.

  Fitting grooves 16a and 16a are respectively formed in the side surfaces 16 and 16 in a lateral direction. The side surfaces 16 and 16 are formed so that the lower flange 1a of the floor beam material 1 is fitted into the fitting grooves 16a and 16a. It is engaged with the floor beam material 1. In this engaged state, the beam mounting member 10 is mounted on the floor beam material 1 by pressing the tip of the fixing bolt 17 screwed into the bottom surface portion 15 against the lower surface of the lower flange 1a.

  The anti-vibration rubber 11 has a structure in which a substantially cylindrical rubber body having a substantially centered portion is sandwiched between upper and lower steel plates, and is formed on the bottom surface portion 15 between the side surface portions 16 and 16 of the beam mounting member 10. It is installed to stand up from.

  The suspension bolt 12 penetrates the anti-vibration rubber 11 and the bottom surface portion 15 of the beam mounting member 10 in the vertical direction with a caulking nut 18 screwed to the upper end portion thereof. The caulking nut 18 is rotatably engaged with the upper plate of the anti-vibration rubber 11.

  And the lower end part of the suspension bolt 12 has penetrated the upper side flange 20 of the 1st field edge receiver 3 mentioned later to an up-down direction. A pair of upper and lower nuts 19, 19 are screwed to the lower end portion of the suspension bolt 12, and the lower end of the suspension bolt 12 is sandwiched between the upper flange 20 of the first field receiver 3 by tightening the nuts 19, 19. The first field receiver 3 is attached to the part.

  As shown in FIG. 2 and FIG. 5, the first field edge receiver 3 is made of channel steel arranged so that the open portion is directed to the side, and a pair of upper and lower flanges 20, 20 and the flanges 20, 20. The web 21 which connects the one end parts along the longitudinal direction is provided. A relatively long type is prepared as the first field receiver 3 .. and is used by processing (cut adjustment) to a length corresponding to the shape and size of the ceiling surface at the site. .

  As shown in FIGS. 2 and 7, the second field edge receiver 4 is made of channel steel arranged so that the open portion is directed to the side, and a pair of upper and lower flanges 20, 20 and the flanges 20, 20. The web 21 is connected to one end portions along the longitudinal direction, and a plurality of bolt insertion holes 21a are formed in the web 21 at appropriate intervals in the longitudinal direction. In the second field edge receiver 4, a plurality of dynamic dampers 30 for reducing heavyweight floor impact noise that are not incorporated in the first field edge receiver 3 are incorporated in advance.

  The dynamic damper 30 is formed by bonding and integrating, for example, a metal mass body 31 formed in a substantially rectangular parallelepiped shape and an elastic body 32 made of, for example, synthetic rubber formed in a substantially rectangular parallelepiped shape slightly smaller than the mass body 31. A mounting plate 33 having a pair of bolt insertion holes 33a, 33a is attached to the side surface of the elastic body 32 opposite to the mass body 31 side.

  The dynamic damper 30 has its mounting plate 33 brought into contact with the web 21 of the second field receiver 4, and nuts 35, bolts 34, 34 inserted into the bolt insertion holes 21a, 33a,. The mass body 31 is elastically supported by the elastic body 32 by screwing and tightening 35, so that the web 21 of the second stiff edge receiving base 4 having high rigidity can be accommodated within the height dimension thereof. It is mounted in a state of overhanging. As a result, the dynamic damper 30 is unlikely to get in the way during construction of piping, heat insulating material, and the like in the underfloor space. The dynamic damper 30 is tuned so as to vibrate in synchronization with, for example, 63 Hz band vibration.

  As the second field receiver 4 with the dynamic damper 30 as described above, several types having different lengths are prepared in advance. Specifically, as shown in FIG. 8, seven types of 6 to 12 dynamic dampers 30... Are incorporated in advance, and each length thereof is, for example, about 1870 mm in order from the shortest. , About 2200 mm, about 2530 mm, about 2870 mm, about 3200 mm, about 3530 mm, and about 3870 mm. In all types of the second field edge receivers 4..., The dynamic dampers 30... Are mounted at a distance of about 333 mm in the longitudinal direction, and the dynamic dampers 30 and 30 located at both ends are connected to the field edges. The distance to both ends of the receiver is about 100 mm.

  Then, several types (specifically, seven types) of the second field edge receivers 4... Having different lengths are arranged while being selectively combined according to the shape and size of the ceiling surface. As a result, on-site processing (cut adjustment) for the second field edge receivers 4... Is eliminated as much as possible, and the expensive and difficult to regenerate dynamic dampers 30.

  In this combination arrangement, the width of the ceiling surface (distance between the opposing building inner walls 6, 6) is the length of the second field edge receiver 4 (longest second field edge receiver) shown in FIG. 1 and 3, the plurality of second field edge receivers 4, 4 are arranged in a horizontal line so that the length matches the width of the ceiling surface. It is adjusted. For example, when the width dimension of the ceiling surface is about 6250 mm, the second field edge receiver 4 shown in FIG. 8C and the second field edge receiver 4 shown in FIG. Two second field receivers 4 shown in d) are used so that they are arranged in a horizontal row.

  And when arranging the 2nd field edge receivers 4 and 4 in a horizontal line in this way, the clearance gap S1 is ensured between the edge parts of the 2nd field edge receivers 4 and 4. FIG. As a result, the second field edge receivers 4 and 4 can be arranged flexibly, and even if some dimensional errors and construction errors occur, the second field edge receivers 4 and 4 can be disposed without hindrance. it can. In addition, when floor impact sound propagates from the upper floor to the lower floor, the interference between the ends of the second field edge receivers 4 and 4 that vibrate is eliminated, and the generation of a rubbing sound due to the friction between the ends. Can be prevented.

  Further, as shown in FIGS. 1 and 3, the plurality of second field edge receiving rows 4A, in which the second field edge receiving members 4, 4 are arranged in a horizontal row, Although they are arranged substantially parallel to each other at substantially equal intervals in a substantially orthogonal direction, in this case, a gap S1, that is, a weakly defective portion occurs in the middle portion of each second field edge receiving row 4A. . Therefore, the gaps S1 ·· in the second field edge receiving rows 4A ·· are not aligned with a straight line (a line indicated by a one-dot chain line in FIG. 3) that is substantially orthogonal to the first field edge receivers 3 ··. By arranging the staggered weakly distributed portions in a staggered manner, the rigidity of the ceiling plate 8 is prevented from being lowered. If the gaps S1... Are arranged in a staggered manner in the vicinity of the position immediately above the partition wall, a decrease in rigidity can be reliably suppressed.

  Further, the second field edge receiver 4 is not supported by hanging on the floor beam material 1 and can be added or removed relatively easily without causing any structural problems. , By appropriately adjusting the number of second field receivers 4... With such a high degree of freedom of construction, the number of installed dynamic dampers 30 .. can be increased or decreased to easily adjust the sound insulation performance against heavy floor impact sound. It is possible.

  Of the first and second field receivers 3, 4..., A dynamic damper 30... For reducing the heavy floor impact noise is incorporated in advance only in the second field receiver 4. The reason why it is not incorporated in the rim 3 is as follows. That is, it is ensured that the first field receiver 3 that is suspended and supported by the floor beam material 1 and supports the ceiling load is continuous from one end to the other of the ceiling surface. This is preferable. For this reason, when constructing the first field receiver 3 .., it is common to prepare a relatively long one and process (cut adjustment) according to the shape and size of the ceiling surface. Yes. Therefore, the dynamic dampers 30... Are not included in the first field receiver 3.. The disposal of the dynamic dampers 30 is eliminated. Even if the dynamic dampers 30 are not incorporated into the first field receivers 3 as described above, the number of the first field receivers 3 is significantly greater than that of the second field receivers 4. Therefore, the sound insulation performance against heavy floor impact sound is not hindered.

  As shown in FIG. 5 and FIG. 9, the field edge 5 is made of, for example, a steel cylinder having a substantially rectangular cross section, and the side surface pieces 40, 40 have locking grooves 41, 41 along the longitudinal direction thereof. Each is formed. The field edge 5 is attached across the lower sides of the first and second field edge receivers 3, 4,... Via a plurality of field edge supports 50.

  As shown in FIGS. 5 and 9, the field edge support member 50 is formed in a substantially U-shape downward by an upper surface portion 51 and a pair of side surface portions 52, 52 extending from both side ends of the upper surface portion 51. A pair of engagement pieces 53, 53 are formed on the upper surface portion 51, and locking claws 54, 54 are formed on the side surface portions 52, 52, respectively.

  And the field edge support tool 50 engages the engagement pieces 53 and 53 with the lower flange 20 of the first field edge receiver 3 and the second field edge receiver 4, whereby the first field edge receiver 3 and the second field edge support 50. It is attached to the field guard 4. Further, by inserting the upper part of the field edge 5 between the side surface parts 52, 52 of the field edge support tool 50 and engaging the engagement claws 54, 54 with the engagement grooves 41, 41 of the field edge 5, 5 is supported.

  As shown in FIG. 10, the wall edge 7 is made of, for example, a steel tube having a substantially square cross section, and has the same structure as the field edge 5. The wall edge 7 is fixed to the building inner wall 6 by a plurality of screws 55, 55 penetrating the side pieces 40, 40 in the lateral direction, and is arranged substantially parallel to the field edge 5.

  And the edge part of the 1st field edge receiver 3 ... which opposes the building inner wall 6 is installed on the wall edge 7 fixed to the inner wall 6 of a building. Specifically, a flat cushioning material 22 made of, for example, foamed resin or rubber is attached in advance to the lower flange 20 of the end of the first field receiver 3. The end portions of the first field edge receivers 3 are placed on the upper surface of the wall edge 7 with the cushioning material 22 interposed therebetween in a state where the edges are cut with respect to the inner wall 6 of the building. Thereby, when floor impact sound propagates from the upper floor to the lower floor, the first field edge 3 which vibrates and the collision sound generated by the interference with the inner wall 6 of the building, the first field edge 3 which vibrates. The generation of rubbing noise due to rubbing against the edge 7 of the wall fixed to the inner wall 6 of the building can be prevented. In addition, the edge part of the 1st field edge receiver 3 ... is not only installed on the wall edge field edge 7 through the cushioning material 22 in this way, but also using the field edge support tool 50 described above. 7 may be installed.

  On the other hand, as shown in FIGS. 4 and 11, the ends of the second field edge receivers 4... Facing the inner wall 6 of the building are arranged in a state of being separated from the wall edge 7 and the second field edge A gap S2... Is secured between the end of the receiver 4. As a result, it becomes possible to arrange the second field edge receivers 4..., And the second field edge receivers 4. it can. Moreover, when the floor impact sound propagates from the upper floor to the lower floor, the second field edge 4 which vibrates interferes with the inner wall 6 of the building, and further the second field edge 4 which vibrates. .. can prevent the generation of rubbing noise caused by rubbing against the edge 7 of the wall fixed to the inner wall 6 of the building.

  In addition, as shown in FIG.11 and FIG.12, as shown in FIG.11 and FIG.12, the edge part of the field edge 5 ... and the wall edge field edge 7 ... is substantially orthogonal with respect to the field edge 5 ... It is fixed to a runner 61 made of grooved steel having a U-shaped cross section that is fixed to the building inner wall 6 with screws 60. Specifically, in the state where the edge of the field edge 5... And the wall edge 7 is inserted into the groove opening to the indoor side of the runner 61, the field edge 5. The end of 7 ... is fixed with screw 62 ....

  In the above ceiling structure, a plurality of first field receivers 3 supported by suspension through vibration-proof suspensions 2 for reducing lightweight floor impact noise, and dynamic dampers for reducing heavy floor impact noise. The plurality of second field edge receivers 4... Incorporating 30... In advance and the plurality of field edges 5. Therefore, the lightweight floor impact sound propagating from the upper floor to the lower floor can be reduced intensively by the anti-vibration suspenders 2, and the heavy floor impact sound propagating from the upper floor to the lower floor can be reduced by the dynamic damper. 30... Can be reduced intensively, and both the lightweight floor impact sound and the heavy floor impact sound can be effectively suppressed.

  Moreover, dynamic dampers 30 incorporated in the second field edge receivers 4 are arranged near the intersections of the second field edge receivers 4 ... and the field edges 5 .... The vicinity of each intersection has high rigidity and is distributed over the entire ceiling. By placing the dynamic damper 30... Near each intersection, the heavy floor impact sound by the dynamic damper 30. Can be effectively utilized over the entire ceiling, and the sound insulation performance against heavy floor impact sound can be further improved.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the ceiling structure of the present invention may be applied not only to a newly built detached house, but also to an existing detached house as a countermeasure against floor impact sound at the time of renovation. Moreover, you may apply not only to a lightweight steel-frame-type detached house but a wooden house and RC structure.

  1 .... floor beam material, 2 .... anti-vibration hanger, 3 .... first field edge receiver, 4 .... second field edge receiver, 4A ..., second field edge receiver row, 5 .... field edge, 6 ..Building inner wall, 7 ..Border edge, 8 ..Ceiling board, 30 ..Dynamic damper, 31 ..Mass body, 32 ..Elastic body, S1 ..Gap

Furthermore, in the countermeasure using the dynamic damper, it is necessary to disperse a relatively large number of dynamic dampers over the entire ceiling in order to improve the sound insulation performance. For this reason, in the structure disclosed in Patent Document 2, for example, a field damper having a relatively high rigidity disposed over the entire ceiling is used, and a dynamic damper is incorporated in these field receivers. In this case, a fixed-length field receiver with a plurality of dynamic dampers installed in advance is carried to the site, and the field receiver with dynamic damper is processed to a length corresponding to the shape and size of the ceiling surface at the site. In many cases, installation is performed with (cut adjustment) to eliminate the work of assembling the dynamic damper at the site and improve workability. However, when processing the edge holder with a dynamic damper in this way (cut adjustment), the cut off end material (excess part) has no other use and can be discarded even if an expensive dynamic damper is incorporated. Inevitably, there was a problem that waste was increased and construction costs and material costs were likely to increase. Moreover, if a dynamic damper that is difficult to regenerate by adhering an elastic body made of synthetic rubber and a metal mass body is discarded, there is a problem that it is not preferable in terms of environment.

In addition, the dynamic damper is pre-installed only in the second field receiver, so that the first field receiver that is forced to perform on-site processing (cut adjustment) must not be assembled. Regarding the 2nd field edge receiver, by arranging several types of different lengths selectively combined according to the shape and size of the ceiling surface, the on-site processing (cut adjustment) is minimized. As a result, it is not necessary to discard expensive and difficult to regenerate dynamic dampers, and it is possible to reduce construction costs and material costs , as well as environmental considerations.

The dynamic damper 30 has its mounting plate 33 brought into contact with the web 21 of the second field receiver 4, and nuts 35, bolts 34, 34 inserted into the bolt insertion holes 21a, 33a,. The mass body 31 is elastically supported by the elastic body 32 by screwing and tightening 35, so that the web 21 of the second stiff edge receiving base 4 having high rigidity can be accommodated within the height dimension thereof. It is mounted in a state of overhanging. As a result, the dynamic damper 30 is unlikely to get in the way during construction of piping, heat insulating material, and the like in the underfloor space. The dynamic damper 30 is tuned so as to vibrate in synchronism with vibrations in the 63 Hz band, for example, in order to improve the heavy floor impact sound blocking performance .

As the second field receiver 4 with the dynamic damper 30 as described above, several types having different lengths are prepared in advance. Specifically, as shown in FIG. 8, seven types of 6 to 12 dynamic dampers 30... Are incorporated in advance, and each length thereof is, for example, about 1870 mm in order from the shortest. , About 2200 mm, about 2530 mm, about 2870 mm, about 3200 mm, about 3530 mm, and about 3870 mm. Note that in all types of second edge receivers 4..., The dynamic dampers 30... Are mounted at a distance of about 333 mm, which is the assigned distance of the field edges in the longitudinal direction. The distance from the dampers 30 and 30 to the both ends of the field edge receiver is about 100 mm.

Claims (6)

A plurality of first field receivers (3) supported by suspension on the floor beam material (1) on the upper floor of the building via a vibration-proof suspension (2) for reducing lightweight floor impact noise, A plurality of second field receivers (4) arranged substantially parallel to the first field receiver (3) without being suspended and supported by the floor beam material (1). A plurality of the first and second field edge receivers (3), (4),... Attached to the lower side of the first and second field edge receivers (3), (4),. , And a ceiling plate (8) attached to the lower side of these field rims (5), and the first and second field ledges (3) (4) Among them, the dynamic dampers (30) for reducing the heavy floor impact noise are incorporated in advance only in the second field receiver (4), and several types of second field receivers (4) having different lengths are provided. ) ... Ceiling structure of a building, characterized in that arranged with selectively combined depending on the shape and size. A wall edge (7) fixed to the inner wall (6) of the building so as to be substantially orthogonal to the first and second field receivers (3), (4),. The end of the first field receiver (3) opposite to the wall edge (7), and the second field receiver opposite to the inner wall (6) of the building. 2. The ceiling structure of a building according to claim 1, wherein the end of (4) is separated from the edge of the wall (7). A plurality of second field receiving rows (4A) are arranged in a horizontal row while securing a gap (S1) between the end portions thereof. Arranged substantially parallel to each other in a direction substantially perpendicular to the field edge receiver (3), and the gap (S1) in the second field edge array (4A), The ceiling structure of the building according to claim 1 or 2, which is arranged in a staggered manner so as not to be aligned on a straight line substantially orthogonal to the first field edge receiver (3). The dynamic damper (30) in the second field edge receiver (4) is arranged near the intersection of the second field edge receiver (4) and the field edge (5). The ceiling structure of the building in any one of Claims 1 thru | or 3. The sound insulation performance against heavy floor impact sound can be adjusted by adjusting the number of the second field edge receivers (4) and increasing or decreasing the number of the dynamic dampers (30). 4. The ceiling structure of the building according to any one of 4 above. The dynamic damper (30) is a combination of a mass body (31) and an elastic body (32), and the elastic body (32) elastically supports the mass body (31), so that the second field edge The building ceiling structure according to any one of claims 1 to 5, wherein the ceiling structure of the building is mounted in a state of projecting in a horizontal direction so as to be within the height dimension of the receiver (4).