JP2017025690A - Upper floor structure and construction method of upper floor structure - Google Patents

Abstract

An object of the present invention is to provide an upper floor structure and a method for constructing the upper floor structure that can improve the sound insulation performance as compared with the existing upper floor structure. A plurality of floor joists 3 spaced apart from each other, a floor material 4 fixed to the upper surface of the floor joists 3, and a ceiling arranged at an interval with respect to the floor joists 3. A joist 5, a ceiling base member 6 fixed to the ceiling joist 5, and a ceiling surface member 7 fixed to the ceiling base member 6, the ceiling base member 6 being fixed to the ceiling joist 5 via a fixing member. The first fixed plate portion 11, the second fixed plate portion 12 to which the ceiling member 7 is fixed via a fixing member, the first fixed plate portion 11 and the second fixed plate portion that are elastically deformable. 12, and a gap is formed between the floor joist 3 and the ceiling base member 6 and between the floor joist 3 and the ceiling surface material 7. [Selection] Figure 1

Description

  The present invention relates to an upper floor structure in a building and a construction method of the upper floor structure.

  The upper floor structure of the house by the framed wall construction method is as follows from the viewpoint of sound insulation measures. Upper floor structure A (see Fig. 6) in which the lower floor ceiling surface material is directly stretched on the upper floor floor joist, and the upper floor structure in which the lower floor ceiling surface material is attached to the ceiling floor joist independent of the upper floor floor joist B (see FIG. 7), an upper floor structure C (see FIG. 8) in which a lower floor ceiling surface material is attached to a ceiling base material having a damping function attached to an upper floor joist.

  Since the upper floor structure A has no sound insulation measures, when an impact such as a walking sound is applied, the floor floor material 101 from the upper floor directly goes through the floor joist 102 and the sealed air layer 103 (air spring) to the lower floor. Vibration is transmitted to the ceiling surface material 104 of the above.

  In the upper floor structure B, as a sound insulation measure, the ceiling floor material 111 of the lower floor is attached to the ceiling joist 112, and the ceiling joist 112 is independent from the floor joist 113. Propagation of vibration due to impact sound to the face material 111 can be suppressed. However, there is room for improvement in that the propagation of vibrations through the air layer 114 cannot be suppressed.

  Therefore, the present inventor first invented the upper floor structure C (see Patent Document 1). The upper floor structure C uses a steel ceiling foundation member 122 having a damping function as a ceiling foundation member to which the ceiling surface material 121 is attached as a sound insulation measure. Thereby, propagation of vibration due to impact sound from the floor surface material 126 to the ceiling surface material 121 of the lower floor through the air layer 123 can be suppressed.

Japanese Patent No. 5600646

  However, in the configuration of Patent Document 1, since the steel ceiling foundation member 122 is directly attached to the floor joist 124, the sound is attenuated by the vibration damping function of the steel ceiling foundation member 122. There is a problem in that vibration due to the impact sound of the above propagates to the ceiling surface material 121 on the lower floor.

  The present invention has been made in view of the above problems, and provides an upper floor structure and an upper floor structure construction method capable of improving the sound insulation performance as compared with the above upper floor structures A to C. This is the issue.

  The invention according to claim 1 for solving the above-mentioned problem is directed to a plurality of floor joists disposed at intervals, a floor material fixed to the upper surface of the floor joists, and the floor joists A support member disposed at an interval, a ceiling base member fixed to the support member, and a ceiling surface member fixed to the ceiling base member, the ceiling base member interposed via the fixing member A first fixing plate portion fixed to the support member, a second fixing plate portion to which the ceiling surface material is fixed via a fixing member, elastically deformable, the first fixing plate portion and the A connecting portion that connects the second fixed plate portion, and a gap is formed between the floor joist and the ceiling base member and between the floor joist and the ceiling surface material. And

  According to the structure which concerns on Claim 1, since the clearance gap is formed between floor joists and a ceiling base member, and between floor joists and a ceiling surface material, it is by impact sound via floor joists from a floor surface material. Vibration is not transmitted directly to the ceiling base material. Therefore, sound insulation performance can be improved. Further, the propagation of vibration due to the impact sound through the air layer can be suppressed by the ceiling base member. This is because when the ceiling base member is elastically deformed, vibration due to impact sound through the air layer or vibration due to impact sound transmitted from the air layer to the ceiling joist can be absorbed.

  The invention according to claim 2 is the upper floor structure according to claim 1, wherein a lower end portion of the support member is disposed below a lower end portion of the floor joist, and the ceiling base member is the support member. It is extended in the direction which cross | intersects with respect to a member and the floor joist, and is fixed over the lower end part of the said several supporting member, It is characterized by the above-mentioned.

  According to the structure which concerns on Claim 2, since the lower end part of a supporting member is arrange | positioned below the lower end part of floor joist, even when floor joist and a ceiling base member are arrange | positioned crossing, floor joist and ceiling base A gap is formed between the members and between the floor joists and the ceiling surface material. Therefore, the vibration due to the impact sound is not directly transmitted from the floor material to the ceiling base member through the floor joist.

  The invention according to claim 3 is the upper floor structure according to claim 2, wherein the ceiling base member has a rising portion that rises from the other end side of the second fixed plate portion to the support member side. The rising portion is extended to a position close to the support member.

  According to the configuration of the third aspect, since the rising portion of the ceiling base member is extended to a position close to the support member, the ceiling base member is input by fastening the fixing member such as a screw to the face material. It is elastically deformed and the tip of the rising portion comes into contact with the support member. Thereby, since the displacement of the second fixing plate portion can be suppressed, the fixing member can be fastened to a desired position of the second fixing plate portion. Therefore, since the generation | occurrence | production of the clearance gap between adjacent ceiling surface materials can be prevented, the sound leakage from a clearance gap can be suppressed. In addition, after the ceiling surface material is fastened, the ceiling base member is restored to the original state by elastic deformation, so that the rising portion and the support member are separated from each other. Therefore, it is possible to prevent the vibration due to the impact sound from being transmitted to the ceiling surface material through the rising portion.

  The invention according to claim 4 is the upper floor structure according to claim 1, wherein the lower end portion of the support member is disposed at the same height as the lower end portion of the floor joist or above the lower end portion of the floor joist. The ceiling base member is arranged in parallel with the support member.

  According to the structure which concerns on Claim 4, since the lower end part of a supporting member is arrange | positioned above the lower end part of floor joists or the same height as the floor joists, the upper floor which has floor joists and ceiling joists A floor structure unit can be built in the factory in advance and installed on site.

  The invention according to claim 5 includes a floor joist arrangement step of arranging a plurality of floor joists at intervals, a floor material fixing step of fixing a floor material to the upper surface of the floor joists, and the floor A supporting member fixing step of arranging a supporting member at a distance from the joist, a ceiling base member fixing step of fixing a ceiling base member to the lower surface of the supporting member, and a ceiling surface material fixed to the lower surface of the ceiling base member A ceiling surface material fixing step, wherein the ceiling base member is fixed to the support member via a fixing member, and the ceiling surface material is fixed to the ceiling surface material via the fixing member. Two fixed plate portions, elastically deformable, a connecting portion connecting the first fixed plate portion and the second fixed plate portion, and from the other end side of the second fixed plate portion to the support member side A rising part that rises, and in the ceiling base member fixing step, the floor joists and the ceiling While fixing the first fixing plate portion and the support member so that a gap is formed between the ground member and between the floor joist and the ceiling surface material, in the ceiling surface material fixing step, The second fixing plate portion and the ceiling member are fixed, and the rising portion is fixed while being brought into contact with the support member by an input when fastening the fixing member.

  According to the method of claim 5, since the rising portion of the ceiling base member is extended to a position close to the support member, the ceiling base member is input by fastening the fixing member such as a screw to the face material. It is elastically deformed and the tip of the rising portion comes into contact with the support member. Thereby, since the displacement of the second fixing plate portion can be suppressed, the fixing member can be fastened to a desired position of the second fixing plate portion. Therefore, since the generation | occurrence | production of the clearance gap between adjacent ceiling surface materials can be prevented, the sound leakage from a clearance gap can be suppressed. In addition, after the ceiling surface material is fastened, the ceiling base member is restored to the original state by elastic deformation, so that the rising portion and the support member are separated from each other. Therefore, it is possible to prevent the vibration due to the impact sound from being transmitted to the ceiling surface material through the rising portion.

  According to a sixth aspect of the present invention, a plurality of floor joists arranged at intervals from each other, a floor material fixed to the upper surface of the floor joists, and arranged at intervals with respect to the floor joists. A support member, a ceiling base member fixed to the support member, and a ceiling surface member fixed to the ceiling base member, and the ceiling base member elastically deforms using the ceiling surface material as a weight. It is a member, and a gap is formed between the floor joist and the ceiling base member, and between the floor joist and the ceiling surface material.

  According to the configuration of the sixth aspect, the ceiling base member elastically deforms with the ceiling surface material as a weight, thereby absorbing vibration due to impact sound through the air layer or vibration due to impact sound transmitted from the air layer to the ceiling joist. can do.

  According to the construction method of the upper floor structure and the upper floor structure according to the present invention, the sound insulation performance can be improved as compared with the above-described upper floor structures A to C.

It is a figure which shows the upper floor structure 1 which concerns on 1st embodiment of this invention, Comprising: (a) is Ia-Ia arrow sectional drawing of (b), (b) is Ib-Ib arrow view of (a). A cross-sectional view is shown. It is a perspective view which shows the ceiling base member which concerns on embodiment of this invention. It is a figure which shows the sound insulation performance according to floor structure kind with respect to a floor impact sound (heavy sound). It is a figure which shows the sound insulation performance according to floor structure kind with respect to a floor impact sound (lightweight sound). It is a figure which shows the upper floor structure 2 which concerns on 2nd embodiment of this invention, Comprising: (a) is Va-Va arrow sectional drawing of (b), (b) is Vb-Vb arrow view of (a). A cross-sectional view is shown. It is a partially broken perspective view which shows the upper floor structure A of the conventional direct tension ceiling. It is sectional drawing which shows the upper floor structure B which has the conventional ceiling joist. It is a figure which shows the upper floor structure C which has the conventional ceiling base material, Comprising: (a) is a perspective view, (b) shows sectional drawing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the upper floor structure 1 exemplifies the case where the upper floor structure 1 is used for the second floor of a wooden two-story house constructed by a framed wall construction method. In the description, the top, bottom, left, and right front and back follow the arrows in FIGS.

(First embodiment)
As shown in FIG. 1, the upper floor structure 1 includes a plurality of floor joists 3, a floor surface material 4, a ceiling joist 5 arranged in parallel to the floor joists 3, and a plurality of ceiling joists 5 (support members). And a ceiling surface material 7 fixed through a ceiling base member 6 below.

  The floor joist 3 is a wooden member laid on a pair of wall sets 20 shown on only one side. A plurality of floor joists 3 are arranged so as to be parallel to each other at a constant interval. Both ends of the floor joist 3 are joined to the end joist 8. The end joist 8 is placed on the wall set 20. The cross-sectional shape of the floor joist 3 is rectangular in this embodiment, but may be other shapes.

  The floor material 4 is a surface material constituting the floor of the second floor. The floor material 4 uses plywood in this embodiment. The floor material 4 is fixed to the upper surface 3a of the floor joist 3 with a fixing member such as a nail.

  The ceiling joists 5 are arranged in parallel to the floor joists 3 so that the lower ends 5 a of the ceiling joists 5 are lower than the lower ends 3 b of the floor joists 3. Both ends of the ceiling joist 5 are attached across the joist stop 15 and the wall set 20. The ceiling joist 5 is a wooden member in the present embodiment and has a rectangular cross section, but may be made of other materials or other shapes.

  The ceiling base member 6 is a steel member that supports the ceiling member 7 and is elastically deformable. For example, the ceiling base member 6 is formed by bending a metal plate into a predetermined shape by press molding. The ceiling base member 6 extends in a direction intersecting with the floor joists 3 and the ceiling joists 5 and is fixed over the lower ends 5 a of the plurality of ceiling joists 5. As illustrated in FIG. 2, the ceiling base member 6 includes a first fixed plate portion 11, a second fixed plate portion 12, a connecting portion 13, and a rising portion 14.

  The ceiling face material 7 is a face material constituting the ceiling of the first floor. The ceiling surface material 7 uses a gypsum board in this embodiment. The ceiling surface material 7 is fixed to the ceiling joist 5 via a ceiling base member 6. Two ceiling members 7 are provided in this embodiment, but any number may be provided.

  The ceiling foundation member 6 will be described in detail. As shown in FIG. 2, the first fixed plate portion 11 has a plate shape and extends horizontally in the left-right direction with a certain width. The first fixed plate portion 11 is a portion fixed to the lower end portion 5 a of the ceiling joist 5. A plurality of screw holes 11a are formed in the first fixed plate portion 11 at equal intervals. The first fixing plate portion 11 may be provided with a rib, or the end portion may be folded back to increase the rigidity.

  The second fixed plate portion 12 has a plate shape and is extended with a constant width and the same length as the first fixed plate portion 11. The second fixed plate portion 12 is substantially parallel to the first fixed plate portion 11. The second fixed plate portion 12 is a portion for fixing the ceiling surface material 7. Although the lower surface of the second fixed plate portion 12 is flat in the present embodiment, for example, a small protrusion protruding downward is provided on the lower surface of the second fixed plate portion 12 to form a non-slip portion for the ceiling surface material 7. May be. Further, a rib may be provided along the front-rear direction or the left-right direction of the second fixed plate portion 12 to increase the rigidity.

  The connecting portion 13 has a plate shape and is extended with a constant width and the same length as the first fixed plate portion 11. The connecting portion 13 is inclined so as to be separated from the first fixed plate portion 11 as it goes downward, and connects the rear end portion of the first fixed plate portion 11 and the front end portion of the second fixed plate portion 12. Yes. The connecting portion 13 is a part that absorbs vibration of the ceiling joist 5 by elastic deformation.

  A plurality of long holes 13a are formed in the connecting portion 13 at equal intervals. The opening ratio of the connecting portion 13 can be changed depending on the size of the long hole 13a, and the ease of deformation of the connecting portion 13 can be adjusted. Although the long hole 13a is provided in the upper part of the connection part 13 in this embodiment, you may form in other height positions. If the connecting portion 13 is elastically deformed, the long hole 13a may not be provided. Further, the connecting portion 13 may be perpendicular to the first fixed plate portion 11 and the second fixed plate portion 12 as long as it can be elastically deformed.

  The rising portion 14 rises from the rear end portion of the second fixed plate portion 12. Further, the rising portion 14 is extended in the left-right direction at a constant height and the same length as the second fixed plate portion 12. The rising portion 14 is extended to a position close to a virtual horizontal line in contact with the upper surface of the first fixed plate portion 11. The rising portion 14 is a portion that functions as a support for reducing the jumping of the second fixed plate portion 12 when the ceiling surface material 7 is fastened to the ceiling base member 6.

  In addition, the rising portion 14 rises slightly inclined in the direction away from the first fixed plate portion 11 in the present embodiment. By tilting the rising portion 14 in this way, a plurality of ceiling base members 6 can be stacked in the vertical direction during storage, and the overall height of the stacked ceiling base members 6 can be reduced.

  In addition, the rising portion 14 is formed with a plurality of slits 14a cut out along the rising direction from the proximal end to the distal end. The slit 14a has a left-right clearance of about 2 mm. The adjacent slits 14a are, for example, at intervals of 250 mm. What is necessary is just to set suitably the clearance gap dimension and space | interval of the slit 14a. In addition, the slit 14 a may be provided continuously to the rising portion 14, the second fixed plate portion 12, and the connecting portion 13.

  The rising portion 14 may rise vertically with respect to the first fixed plate portion 11. In the present embodiment, the ceiling base member 6 is formed by bending or punching a steel plate having a certain thickness, but may be formed by another manufacturing method.

  Next, the construction method of the upper floor structure 1 according to this embodiment will be described. In the construction method of the upper floor structure according to the present embodiment, the floor joist arrangement step, the floor surface material fixing step, the support member fixing step, the ceiling base member fixing step, and the ceiling surface material fixing step are performed.

  In the floor joist arranging step, as shown in FIGS. 1A and 1B, the end of the floor joist 3 is arranged on the end joist 8, and a plurality of them are provided at a certain interval so as to be parallel to each other. This is arranged.

  In the floor surface material fixing step, the floor surface material 4 is fixed to the upper surface 3a of the floor joist 3 using a fixing member such as a nail, as shown in FIGS.

  In the supporting member fixing step, as shown in FIGS. 1A and 1B, the ceiling joist 5 is attached to the end joist 15 and the wall set 20 with the ceiling joist 5 being spaced from the floor joist 3. While arranging the end portions, a plurality of them are arranged at regular intervals so as to be parallel to each other. A lower end 5 a of the ceiling joist 5 is disposed below the lower end 3 b of the floor joist 3.

  In the ceiling base member fixing process, as shown in FIGS. 1A and 1B, the ceiling base member 6 is attached over the lower ends 5a, 5a,. Specifically, as shown in FIG. 1A and FIG. 2, the screw holes 11a of the first fixing plate portion 11 of the ceiling base member 6 and the lower ends 5a, 5a,. A fixing member such as a screw is driven into a position corresponding to, and the first fixing member 11 is fixed to the ceiling joist 5 in a direction intersecting the ceiling joist 5. The fastening device for fastening the fixing member is not particularly limited, but here, an impact driver connected to an air compressor and using compressed air as a power source is used.

  When only the first fixed plate portion 11 is fixed to the ceiling joist 5, a gap is formed from the lower end portion 5 a of the ceiling joist 5 to the tip of the rising portion 14. The gap may be set as appropriate, but is, for example, 2 to 4 mm, more preferably 3 mm.

  In the ceiling surface material fixing step, the ceiling surface materials 7 and 7 are fixed to the ceiling base member 6. A fixing member such as a screw is driven into a position corresponding to the second fixed plate portion 12 from the lower surface side of the ceiling surface material 7, and the ceiling surface materials 7 and 7 are fixed to the second fixed plate portion 12. At this time, the connecting portion 13 is mainly elastically deformed, and the leading end of the rising portion 14 abuts against the lower end portions 5a, 5a,... Of the ceiling joists 5, 5,. After the ceiling members 7 are fixed, a gap S1 is formed between the ceiling member 7 and the floor joists 3, as shown in FIG. Further, a gap S <b> 2 is formed between the lower end portion 5 a of the ceiling joist 5 and the tip of the rising portion 14. The upper floor structure 1 is constructed by performing the above steps.

(results of the experiment)
3 and 4 show data obtained by actually measuring the sound insulation performance by floor structure type.
Regarding the floor joist 3 dimensions, the thickness of the floor covering 4, the ceiling joist 5, the ceiling base member 6, and the ceiling floor 7, the floor structures A to C and the floor according to the present invention are used. The structure is the same condition.
In both cases of heavy floor impact sound and lightweight floor impact sound, the impact sound level of the upper floor structure according to the present invention is lower than any of the impact sound levels of the upper floor structures AC.
In general, if the decibel is reduced by 3 dB, the energy amount is reduced to about a half, and if it is decreased by 6 decibels, the energy amount is about a quarter.
Normally, it is necessary to take separate measures for heavy floor impact sound and lightweight floor impact sound, but the present invention is also superior in that it is a countermeasure for both heavy floor impact sound and lightweight floor impact sound. .

(Second embodiment)
As shown in FIGS. 5A and 5B, in the upper floor structure 2 according to the second embodiment, the lower end portion 5 a of the ceiling joist 5 is arranged at the same height as the lower end portion 3 b of the floor joist 3. And the point that the ceiling base member 6 is arranged in parallel with the floor joists 3 and the ceiling joists 5 are mainly different. Hereinafter, the difference will be mainly described.

  The configurations of the floor joists 3, the floor surface material 4, the ceiling surface material 7, the first fixed plate portion 11, the second fixed plate portion 12, the connecting portion 13, and the rising portion 14 are the same as those in the first embodiment.

  The ceiling joists 5 are arranged in parallel to the floor joists 3. The lower end 5 a of the ceiling joist 5 is arranged at the same height as the lower end 3 b of the floor joist 3. The both ends of the floor joists 3, 3,... Are joined to the end joists 8, and the both ends of the ceiling joists 5, 5,. Therefore, since the ceiling joist 5 and the wall set 20 do not interfere with each other, the upper floor structure 2 (floor joist 3, flooring material 4, ceiling joist 5, end joist 8, end joist stop 9, side joist and collateral joist 10 As compared with the first embodiment, it is much easier to install a pre-cast and pre-cast product in a factory or the like as compared with the first embodiment. The ceiling joist 5 is a wooden member in the present embodiment and has a rectangular cross section, but may be made of other materials or other shapes. Further, the lower end portion 5a of the ceiling joist 5 can be disposed above the lower end portion 3b of the floor joist 3 as long as the gaps S1 and S2 can be secured.

  The ceiling base member 6 extends in a direction parallel to the ceiling joist 5 and is fixed to the lower end portion 5 a of the ceiling joist 5. As illustrated in FIG. 2, the ceiling base member 6 includes a first fixed plate portion 11, a second fixed plate portion 12, a connecting portion 13, and a rising portion 14. The rising portion 14 is disposed at a position where it can contact the lower end portion 5a of the ceiling joist 5 to which the ceiling foundation member 6 is attached. In order to make the rising portion 14 easily contact the lower end portion 5a of the ceiling joist 5, the ceiling joist 5 uses a member wider than the floor joist 3 (see FIG. 5A).

  Next, the construction method of the upper floor structure according to this embodiment will be described. In the construction method of the upper floor structure according to this embodiment, the floor joist arrangement step, the floor surface material fixing step, the support member fixing step, the ceiling base member fixing step, and the ceiling surface material as in the above construction method. The fixing process is performed.

  Since the floor joist arrangement process and the floor surface material fixing process are the same as the operations in the first embodiment, the description thereof is omitted.

  In the supporting member fixing step, as shown in FIGS. 5A and 5B, the end of the ceiling joist 5 is arranged on the end joist 15 while being spaced apart from the floor joist 3. A plurality of ceiling joists 5 are arranged at regular intervals so as to be parallel. The lower end 5 a of the ceiling joist 5 is arranged at the same height as the lower end 3 b of the floor joist 3. In addition, the lower end part 5a of the ceiling joist 5 can be disposed above the lower end part 3b of the floor joist 3 as long as the gaps S1 and S2 can be secured.

  In the ceiling base member fixing step, the ceiling base member 6 is attached to the lower end portion 5a of the ceiling joist 5 as shown in FIG. Specifically, as shown in FIG. 5A and FIG. 2, a screw or the like is provided at a position where the screw hole 11 a of the first fixing plate portion 11 of the ceiling base member 6 and the lower end portion 5 a of the ceiling joist 5 correspond to each other. The fixing member is driven and the first fixing member 11 is fixed to the ceiling joist 5 in parallel with the ceiling joist 5.

  The ceiling surface material fixing step is basically the same as the work of the first embodiment, but when the ceiling surface material 7 is fixed, the tip of the rising portion 14 is a ceiling joist with the ceiling base member 6 attached thereto by elastic deformation. 5 is different in that it contacts only the lower end 5a.

  According to the upper floor structure 1 and the upper floor structure 2 described above, the sound insulation performance can be enhanced as compared with the upper floor structures A to C.

  In addition, since the order of an above described process is an illustration, each process may be followed. Moreover, although the upper floor structure 2 may be constructed on-site, a pre-cast and pre-cast structure in a factory or the like may be installed on-site. As a result, quality can be improved and work on site can be saved.

  In addition, when the ceiling base member 6 is elastically deformed, vibration through the air layer or vibration transmitted from the air layer to the ceiling joist 5 can be absorbed. If the floor joist 3 and the ceiling surface material 7 are in contact with each other, vibration may be transmitted to the first floor via the floor joist 3, but the floor joist 3 and the ceiling surface material 7 have a gap S1. Since it is disposed open, the sound insulation performance is not impaired by the floor joist 3. In addition, since the gap S2 is secured between the lower end portion 5a of the ceiling joist 5 and the tip of the rising portion 14, elastic deformation of the connecting portion 13 can be allowed.

In addition, if the rising part 14 is not formed in the ceiling base member 6, the operation | work which fixes the ceiling surface material 7 to the 2nd fixing plate part 12 will become difficult. That is, if the rising portion 14 is not formed, the second fixing plate portion 12 jumps upward when a fixing member such as a screw is driven, and the ceiling surface material 7 is fixed at a position deviated from a desired position. It may be done. For this reason, a clearance gap arises between adjacent ceiling surface materials 7 and 7, and sound leaks from an upper floor through this clearance gap.
However, when the rising portion 14 is formed on the ceiling base member 6 as in the present embodiment, the ceiling surface material 7 and the second fixing plate are caused by the impact of the impact driver while the fixing member such as a screw is driven. Part 12 receives an upward force. Thereby, the ceiling base member 6 is elastically deformed, and the leading end of the rising portion 14 comes into contact with the lower end portion 5 a of the ceiling joist 5. Therefore, since the displacement of the second fixing plate portion 12 can be reduced, the fixing member can be driven into a desired position. As a result, it is possible to prevent a gap from being generated between the adjacent ceiling surface materials 7 and 7, and to suppress sound leakage on the upper floor from the gap. In addition, after the ceiling member 7 is fastened, the ceiling base member 6 is restored to its original state by elastic deformation, so that the rising portion 14 and the ceiling joist 5 are separated from each other. Therefore, it is possible to prevent vibration due to impact sound from being transmitted to the ceiling member 7 through the rising portion 14.

  Moreover, since the torsional rigidity of the ceiling base member 6 is reduced by providing the slit 14a in the rising portion 14, the ceiling base member 6 is easily bent. Thereby, since the ceiling base member 6 becomes easy to elastically deform, transmission of vibration can be reduced by absorbing vibration more.

Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, the rising portion 14 of the ceiling base member 6 may be appropriately formed as necessary.
The upper floor structure according to the present invention can be used not only for the second floor but also for the third floor.

  The structure of the ceiling base member 6 is not particularly limited as long as it can be elastically deformed with the ceiling surface material 7 as a weight. For example, the ceiling joist 5 and the ceiling surface material 7 may be connected by a spring member (not shown).

DESCRIPTION OF SYMBOLS 1 Upper floor structure 2 Upper floor structure 3 Floor joist 4 Floor material 5 Ceiling joist 6 Ceiling base material 7 Ceiling surface material 8 Edge joist 9 Side joist 10 Side joist 11 First fixed plate part 12 Second fixed plate part 13 Connecting portion 14 Rising portion 15 Edge joisting stop 20 Wall assembly S1 gap S2 gap

Claims (6)

A plurality of floor joists arranged at intervals from each other;
A floor covering fixed to the upper surface of the floor joist,
A support member disposed at an interval with respect to the floor joist, and
A ceiling base member fixed to the support member;
A ceiling surface material fixed to the ceiling base member,
The ceiling base member is
A first fixing plate portion fixed to the support member via a fixing member;
A second fixing plate portion to which the ceiling surface material is fixed via a fixing member;
A connecting portion that is elastically deformable and connects the first fixed plate portion and the second fixed plate portion;
An upper floor structure in which gaps are formed between the floor joists and the ceiling base member and between the floor joists and the ceiling surface material. The upper floor structure according to claim 1,
The lower end of the support member is disposed below the lower end of the floor joist,
The upper floor is characterized in that the ceiling base member extends in a direction intersecting the support member and the floor joists and is fixed over lower ends of the plurality of support members. Construction. The upper floor structure according to claim 2,
The ceiling base member has a rising portion that rises from the other end side of the second fixing plate portion to the support member side,
The upper floor structure, wherein the rising portion is extended to a position close to the support member. The upper floor structure according to claim 1,
The lower end of the support member is disposed at the same height as the lower end of the floor joist or above the lower end of the floor joist,
The upper floor structure is characterized in that the ceiling base member is disposed in parallel with the support member. A floor joist arrangement step of arranging a plurality of floor joists at intervals from each other;
A floor surface material fixing step of fixing a floor surface material to the upper surface of the floor joist,
A support member fixing step of disposing a support member at an interval with respect to the floor joist,
A ceiling base member fixing step of fixing the ceiling base member to the lower surface of the support member;
A ceiling surface material fixing step of fixing a ceiling surface material to the lower surface of the ceiling base member,
The ceiling base member is
A first fixing plate portion fixed to the support member via a fixing member;
A second fixing plate portion to which the ceiling surface material is fixed via a fixing member;
A connecting portion that is elastically deformable and connects the first fixed plate portion and the second fixed plate portion;
A rising portion that rises from the other end of the second fixed plate portion to the support member;
In the ceiling base member fixing step, the first fixing plate portion and the support member are formed such that a gap is formed between the floor joist and the ceiling base member and between the floor joist and the ceiling surface material. And fix
In the ceiling surface material fixing step, the second fixing plate portion and the ceiling surface material are fixed, and the rising portion is fixed in contact with the support member by an input when fastening the fixing member. The construction method of the upper floor structure that is characteristic. A plurality of floor joists arranged at intervals from each other;
A floor covering fixed to the upper surface of the floor joist,
A support member disposed at an interval with respect to the floor joist, and
A ceiling base member fixed to the support member;
A ceiling surface material fixed to the ceiling base member,
The ceiling base member is a member that elastically deforms with the ceiling surface material as a weight,
An upper floor structure in which gaps are formed between the floor joists and the ceiling base member and between the floor joists and the ceiling surface material.

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