JP2009035859A - Floor slab structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor slab structure which enables a slab having a top surface with a step to restrain vibrations generated by a heavyweight floor impact sound, without decreasing construction efficiency. <P>SOLUTION: This floor slab structure has a floor slab in which post-cast concrete is placed above a plate-like lightweight member 3 partially placed on a half PCa floor member 2 so that a rising section 4 can be formed integrally with the half PCa floor member 2. A strip-shaped edge material 7, which has rigidity higher than that of the slab 1, which is rigidly joined to the slab 1 and both the ends of which are rigidly joined to a structural member for supporting the slab 1, is formed with a predetermined width along an edge 4a of the rising section 4. A distance from the strip-shaped edge material 7 to the structural member for supporting the slab 1 is set as long as/shorter than the wavelength of a bending wave at predetermined impact frequencies, which is transmitted to the slab in a bending wave restraining area 5 enclosed with the strip-shaped edge material 7 and the structural member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor slab structure capable of suppressing impact vibration such that a floor impact sound is generated in a floor slab having a step formed on an upper surface.

  In recent apartments, in order to provide a barrier-free floor with no steps, a step is provided on the upper surface of the slab to secure piping space around the water field between the upper surface of the slab and the upper surface of the floor finish. . However, building a floor slab by shifting the entire slab up and down to provide a step on the top surface of the slab takes a lot of work and further increases the ceiling height with a limited floor height due to the step at the bottom of the slab. It becomes difficult to do. For this reason, Patent Document 1 discloses a structure of a floor slab in which a step is formed only on the top surface of the slab without forming a step on the bottom surface of the slab. In Patent Document 1, a hollow portion is provided inside the entire surface of a reinforced concrete floor slab to increase the slab thickness, thereby raising the upper surface of the floor slab, and partially omitting the hollow portion of the floor slab to increase the slab thickness. A technique for forming a step on the upper surface of the floor slab by making the upper surface of the floor slab partially lower by reducing the size is shown.

On the other hand, floor slabs are also required to have a performance to block floor impact sound from adjacent dwellings (especially the upper floor). The slab blocking effect against lightweight floor impact sound can be obtained by a simple method such as laying a mat, but the slab blocking effect against heavy floor impact sound such as children jumping and running around is affected by the thickness of the slab, beams and It depends on the distance between the vibration restraining member such as a seismic wall and the position where the heavy floor impact sound is generated. That is, a vibration restraint member that restrains displacement due to vibration caused by impact on a slab that generates heavy floor impact sound (hereinafter referred to as “vibration against heavy floor impact sound”), such as a beam or a shear wall, and the weight floor impact sound. A sufficient sound insulation effect cannot be obtained with respect to the vibration generated at a portion where the distance from the generation position is a certain distance or more. Patent Document 2 shows that a step portion of a slab can obtain vibration restraint against heavy floor impact sound in the same manner as a vibration restraint member such as a beam or a seismic wall. It has been shown that the floor slab portion located at a distance exceeding the half wavelength (0.5λb) of the bending wave of the slab determined by the impact frequency cannot obtain sufficient vibration restraint against heavy floor impact sound. Furthermore, in patent document 2, it is the structure of the floor slab supported by the vibration restraining member, Comprising: The distance exceeding the half wavelength (0.5 (lambda) b) of the bending wave with respect to the predetermined impact frequency of a floor slab from the nearest vibration restraining member It has been shown that by providing a step portion of the slab in the unconstrained floor slab portion located at, vibration restraint by a beam or the like or a step portion can be obtained over the entire range of the floor slab.
Japanese Patent Laid-Open No. 08-239934 JP 2007-56513 A

  In patent document 1, since the slab level | step difference part is not considered as a member which restrains slab vibration, the effective arrangement | positioning which restrains slab vibration is not shown. For this reason, a portion in which vibration of the slab with respect to the heavy floor impact sound is not restrained occurs, and there may be a case where the shielding performance against the heavy floor impact sound of the slab cannot be sufficiently ensured. On the other hand, in the floor slab structure in Patent Document 2, a step is also formed on the bottom surface of the slab, so that the half PCa floor member is divided at the stepped portion and further provided with a stepped formwork, the work is troublesome. It becomes difficult to secure a large ceiling height within the range of the floor height.

  The present invention was devised in view of the above-described conventional problems, and a floor slab structure capable of constructing a slab having a step on the upper surface as a slab capable of restraining vibration against heavy floor impact sound without lowering construction efficiency. The purpose is to provide.

  The present invention was devised in view of the above-described conventional problems, and the structure of the slab according to the present invention is a post-cast concrete above a plate-like lightweight member partially placed on a half PCa floor member. Is a floor slab structure having a slab formed integrally with the half PCa floor member, and having a predetermined width along an edge of the bulk upper portion, and having a higher rigidity than the slab. And having a belt-like edge member rigidly joined to the slab and having both ends rigidly joined to the structural member supporting the slab, from the belt-like edge member to the structural member supporting the slab. Is set to be equal to or less than the wavelength of the bending wave due to a predetermined impact frequency to the slab in the bending wave restraining region surrounded by the strip-shaped edge member and the structural member.

  For the first slab region in which the upper part of the bending wave is constrained, the distance from the strip-shaped edge material to the structural member that supports the slab is set to the slab in the first slab region. The second slab region that is set to be equal to or less than the wavelength of the bending wave due to a predetermined shock frequency and does not form the bulky portion of the bending wave restraining region, from the strip-shaped edge material to the structural member that supports the slab. Is set to be equal to or less than the wavelength of the bending wave due to a predetermined impact frequency to the slab in the second slab region.

  The band-shaped edge members are formed to face each other, and the distance between the band-shaped edge members is set to be equal to or less than the wavelength of the bending wave with respect to a predetermined impact frequency to the slab in the region sandwiched between the band-shaped members. It is characterized by that.

  The strip-shaped edge member is formed of post-cast concrete that is cast upward with the half PCa floor member, and a lower bending reinforcement bar is embedded in the half PCa floor member, and an upper bending reinforcement bar is embedded in the post-cast concrete. Is embedded, and the vertical reinforcing bars are embedded from the half PCa floor member to the post-cast concrete at an appropriate interval in the length direction of the strip-shaped edge member by engaging with the lower bending reinforcing bars and the upper bending reinforcing bars. A lateral joint bar is embedded from the slab to the post-cast concrete of the strip member.

  In the floor slab structure according to the present invention, a slab having a step on the upper surface can be constructed as a slab capable of restraining vibration against heavy floor impact sound without reducing construction efficiency.

  Hereinafter, a preferred first embodiment of a floor slab structure according to the present invention will be described in detail with reference to the accompanying drawings. In the floor slab structure of this embodiment, as shown in FIGS. 1 and 2, post-cast concrete 10 is placed above a plate-like lightweight member 3 partially placed on the half PCa floor member 2. , A floor slab structure having a slab 1 in which a bulky upper part 4 is formed integrally with the half PCa floor member 2, having a predetermined width along the edge of the bulky part 4 and higher rigidity than the slab 1, In addition, a belt-like edge member 7 that is rigidly joined to the slab 1 and that is rigidly joined to both ends of the pillar 8 and the beam 6 that support the slab 1 is formed, and the pillar 8 that supports the slab 1 from the belt-like edge member 7 The distance to the beam 6 is set to be equal to or less than the wavelength λb of the bending wave due to a predetermined impact frequency to the slab 1 in the bending wave restraining region 5 surrounded by the strip-shaped edge member 7 and the column 8 or the beam 6.

  The slab according to the present embodiment is a floor slab in an apartment house having an RC ramen structure. The room A of the dwelling unit is a rectangular plane that is horizontally long in the X direction, and a common corridor B and a veranda C are provided outside the room in the X direction. Columns 8 are provided at the four corners of the slab 1 of the living room A, and beams 6 are installed between the columns 8. The beam 6 includes a veranda-side Y-direction beam 60 (hereinafter referred to as “veranda-side beam 60”), a corridor-side Y-direction beam 61 (hereinafter referred to as “corridor-side beam 61”), and an X-direction beam positioned on the upper side in FIG. It is composed of a beam 62 (hereinafter referred to as “X direction first beam 62”) and an X direction beam 63 (hereinafter referred to as “X direction second beam 63”) located below. A doorway wall 9 is provided between the living room part A and the adjacent living room part A '. In this embodiment, the column 8 and the beam 6, and the beam 6 and the slab 1 are integrally constructed of reinforced concrete.

  The slab 1 is mainly surrounded and supported by the beams 60 to 63, and is supported by the pillars 8 at the four corners. The slab 1 is basically composed of a half PCa floor member 2 that forms the bottom surface 1a of the slab 1 and also serves as a slab formwork, and a post-cast concrete 10 placed thereon. The bottom surface 1a of the slab 1 formed by the half PCa floor member 2 has no step or gradient, and the bottom surface 1a is formed flat. The half PCa floor member 2 is a PCa member composed of a flat plate 19 made of concrete (hereinafter referred to as “concrete plate 19”), and a slab lower bar 20 and a truss-like reinforcing bar 21 are embedded in the concrete plate 19. Has been. The truss-shaped reinforcing bar 21 is embedded in the concrete plate 19 with its upper portion protruding from the upper surface of the concrete plate 19. Note that the half PCa floor member 2 does not necessarily have the truss-shaped reinforcing bars 21.

  A bulk upper portion 4 is formed on a part of the slab 1. The bulky portion 4 is formed by a plate-like lightweight member 3 partially placed on the half PCa floor member 2 and a post-cast concrete 10 placed thereon. The bulk 4 is formed integrally with the half PCa floor member 2 by post-cast concrete 10. The slab 1 is composed of a slab 11 (hereinafter referred to as a “thick slab 11”) composed of a bulky portion 4 and a half PCa floor member 2, and a post-cast concrete 10 in which the half PCa floor member 2 and a plate-like lightweight member are not embedded. The slab 12 is configured (hereinafter referred to as “thin slab 12”). The upper surface of the thick slab 11 is formed higher than the upper surface of the thin slab 12, and a step is formed between the upper surfaces. In the present embodiment, the upper surface of the thick slab 11 is set to the same height as the beam top end of the beam 6.

  The plate-like lightweight member 3 of the bulk upper portion 4 has a function of forming the bulk upper portion 4 while suppressing an increase in the slab weight of the thick slab 11. The plate-like lightweight member 3 in the present embodiment is molded as a lightweight cubic member having a length and width of about 400 mm using a foamed resin having a specific gravity smaller than that of the post-cast concrete 10. The thickness of the plate-like lightweight member 3 is appropriately selected according to the required height of the bulky portion 4. In addition, the height from the half PCa floor member 2 of the bulk upper portion 4 is determined by the height required for equipment piping or the like provided between the floor surface and the upper surface of the thin slab 12. A plurality of the plate-like lightweight members 3 are arranged with gaps in the X and Y directions with the truss-like reinforcing bars 21 protruding on the half PCa floor member 2 interposed therebetween. A post-cast concrete 10 is placed in and around the gap around the plate-shaped lightweight member 3 arranged. A slab upper end bar 22 of the slab 1 is embedded in the post-cast concrete 10 above the plate-shaped lightweight member 3 at predetermined intervals in the X and Y directions. The truss-shaped reinforcing bars 21 of the half PCa floor member 2 are embedded. The thickness of the post-cast concrete 10 above and around the plate-like lightweight member 3 is secured to ensure the required strength of the slab 1. The integrity of the half PCa floor member 2 as the slab 1 and the bulky upper portion 4 is such that the truss-shaped reinforcing bars 21 of the half PCa floor member 2 embedded in the bulky upper portion 4 and the adhesive strength of the post-cast concrete 10 between them. Secured by The shape of the plate-like lightweight member 3 is not limited as long as the integrity of the half PCa floor member 2 and the post-cast concrete 10 can be secured. In addition, the plate-like lightweight member 3 can ensure its function, and if it is lighter than the post-cast concrete 10, a block or box made of expanded polystyrene or polystyrene, a paper box such as cardboard, a thin metal A hollow frame material made of metal may be used, and the material is not limited.

  The bulk upper portion 4 is provided between the first and second beams 62 and 63 in the X direction of the slab 1 from the veranda side beam 60 toward the hallway side beam 61. The edge 4a on the corridor side beam 61 side of the bulky portion 4 in this embodiment is located at a position away from the veranda side beam 60 by about 2/3 of the distance between the veranda side beam 60 and the corridor side beam 61. 60 is formed substantially in parallel. The top end of the beam 6 is formed at the same height as the upper surface of the bulky portion 4. The slab 1 in the range where the bulk upper portion 4 is provided is formed as a thick slab 11. The range where the bulk upper portion 4 is not provided, that is, the slab 1 surrounded by the edge 4a of the bulk top portion 4 and the hallway side beam 61 and the first and second beams 62 and 63 in the X direction is mainly formed by the thin slab 12. The bulk upper part 4 has a step with the upper surface of the thin slab 12 at the edge 4a.

  A strip-shaped edge member 7 is formed along the edge 4 a of the bulky portion 4. The “edge” on which the belt-like edge material 7 of the present embodiment is formed is a side surface that is not connected to the beam 6 of the bulky portion 4, and is not a side surface of the boundary between the slab 1 and the beam 6. That is, the “edge” where the belt-like edge material 7 is formed means the side surface of the bulky portion 4 that is formed in the inward range of the slab 1 and causes a step on the upper surface of the slab 1. The position of the edge part 4a in this embodiment corresponds to the side surface position on the step side of the plate-like lightweight member 3 placed on the half PCa floor member 2. The belt-like edge member 7 in the present embodiment is formed along the edge 4a on the corridor side beam 61 side of the bulky portion 4, and the veranda side beam 60 (or the corridor side) between the first and second beams 62 and 63 in the X direction. It is formed substantially parallel to the beam 61). Thereby, the edge part 4a which comprises the level | step difference with the thin slab 12 is connected to one side surface of the strip | belt-shaped edge member 7, and the level | step-difference part with the thin slab 12 is formed in the other side surface of the strip | belt-shaped edge member 7.

  The belt-like edge member 7 of the present embodiment is a member having a rectangular cross section, and is formed of a half PCa floor member 2 and a post-cast concrete 10 placed upward. The post-cast concrete 10 of this embodiment is cast to a thickness equal to the bulk upper portion 4 to form the edge concrete portion 70 of the strip-shaped edge member 7. Therefore, the thickness of the strip-shaped edge member 7 is formed to be substantially equal to the thickness of the thick slab 11. The thickness of the strip-shaped edge material 7 should just be larger than the thickness of the thin slab 12 at least. The belt-like edge member 7 is rigidly joined to the slab 1, and both ends are rigidly joined to the beam 6. That is, the end portions of the strip-shaped edge member 7 are rigidly joined to the X direction first beam 62 and the X direction second beam 63. The half PCa floor members 2 of the strip-shaped edge member 7, the thick slab 11 and the thin slab 12 are members having the same shape, and are provided so that their bottom surfaces are flush with each other. The upper surface of the thick slab 11 is formed with a step from the upper surface of the thin slab 12 with the strip-shaped edge material 7 interposed therebetween.

  In the present embodiment, the side surface on the thick slab 11 side of the strip-shaped edge member 7, that is, the side surface on the step side of the bulky portion 4 is connected to the edge 4 a of the bulky portion 4 over the entire side surface. Are rigidly joined. Further, the side surface of the strip-shaped edge member 7 on the thin slab 12 side has a step with the thin slab 12 and is rigidly joined to the thin slab 12 at the lower part of the side surface. The dimension between the side surfaces of the band-shaped edge member 7 constitutes a predetermined width of the band-shaped edge member 7, and the width may be a dimension that can ensure the rigidity of the band-shaped edge member 7 and the rigid connection with the slab 1. The slab 1 is effectively joined to the beam 6 as a vibration restraining material via the strip-shaped edge member 7 by being rigidly bonded to the end portion and the side surface of the strip-shaped edge member 7.

  In the strip-shaped edge member 7, a lower bending reinforcement bar 23 is embedded in the half PCa floor member 2, and an upper bending reinforcement bar 24 is embedded in the post-cast concrete 10, so that the bending rigidity of the band-shaped edge member 7 is ensured. Yes. In the present embodiment, the upper bending reinforcing bars 24 are provided at the left and right corners of the upper section of the strip-shaped edge member 7, that is, the left and right corner portions of the upper section of the edge concrete portion 70 formed by the post-cast concrete 10. The bars are arranged along the length direction. The lower bending reinforcement bars 23 are embedded in the half PCa floor member along the length direction at the left and right corners at the lower part of the cross section of the strip-shaped edge member 7. Further, the upper bending reinforcing bar 24 extends to the beam 6 to which the end of the strip-shaped edge member 7 is connected and is fixed in the beam 6. By fixing the upper bending reinforcing bar 24 and the edge material concrete portion 70 of the belt-like edge member 7 being cast integrally with the X-direction first beam 62 and the X-direction second beam 63, the beam 6 As a result, a rigid joint at the end of the belt-like edge member 7 is secured. By securing the rigid joint, vibration due to impact on the original vibration restraining member of the slab 1, that is, the slab 1 that generates heavy floor impact sound, that is, vibration that restrains displacement due to vibration with respect to the heavy floor impact sound. The belt-like edge member 7 as an auxiliary vibration restraining member is integrated with the beam 6 as the restraining member, and the vibration restraining property of the belt-like edge member 7 with respect to the slab 1 can be exhibited more reliably.

  Further, the strip-shaped edge member 7 engages with the lower bending reinforcement bar 23 and the upper bending reinforcement bar 24 and is placed from the half PCa floor member 2 at an appropriate interval in the length direction of the band-shaped edge member 7 (edge). The longitudinal reinforcing bars 25 are embedded over the material concrete part 70). Thereby, the rigidity of the strip | belt-shaped edge material 7 is ensured. The vertical reinforcing bar 25 of the present embodiment surrounds an inverted U-shaped upper vertical reinforcing bar 25a and a left and right lower bending reinforcing bar 23, which are arranged so as to cover the left and right upper bending reinforcing bars 24 from above. Are combined with a U-shaped lower vertical reinforcing bar 25b. The vertical reinforcing bars 25 are connected to the upper and lower bending reinforcing bars 23, 24 by connecting the upper vertical reinforcing bars 25 a and the lower vertical reinforcing bars 25 b, and are formed as rod-shaped reinforcing bars surrounding them. . The lower vertical reinforcing bar 25 b is embedded in the half PCa floor member 2 together with the lower bending reinforcing bar 23, and the upper vertical reinforcing bar 25 a is embedded in the edge concrete part 70. Thereby, the integrity of the half PCa floor member 2 of the strip-shaped edge member 7 and the edge material concrete portion 70 is ensured. In the present embodiment, the belt-like edge member 7 has a lower bending reinforcing bar 23, an upper bending reinforcing bar 24, and a vertical reinforcing bar 25, thereby ensuring higher rigidity than the thick slab 11 and the thin slab 12.

  In the belt-like edge member 7, a lateral joint bar 26 is embedded from the slab 1 to the post-cast concrete 10 of the belt-like member 7, that is, the edge material concrete portion 70. In the present embodiment, the lateral joining bar 26 includes a thick part joining bar 27 and a thin part joining bar 28. A plurality of thick-walled joint bars 27 are arranged from the thick-walled slab 11 to the belt-like edge member 7 at appropriate intervals in the length direction of the belt-like edge material 7. The thick-walled joint bar 27 of this embodiment includes an upper thick-wall joint bar 27a disposed on the upper portion of the strip-shaped edge member 7 and a lower-stage thick-wall joint bar 27b disposed on the lower side. The upper thick-walled joint bar 27 a is configured by a slab upper bar 22 of the bulk upper portion 4 that extends from the strip-shaped edge member 7. Specifically, the slab upper end reinforcement 22 embedded in the post-concrete concrete 10 of the bulk upper part 4 is bent downward from the upper part of the upper bending reinforcement bar 24 in front of the side surface of the thin slab side 12 of the band edge member 7, By extending to the upper surface of the half PCa flooring 2 of the belt-like edge material 7 and fixing it in the edge material concrete part 70, the upper thick-walled joint bar 27a is formed. The lower thick-walled joint bars 27b are composed of reinforcing bars that are arranged on the upper surface of the half PCa floor member 2 from the thick-walled slab 11 to the strip-shaped edge member 7 and the thin-walled slab 12 and are embedded in each cast concrete 10. Has been. The lower thick joint portion 27b is arranged on the half PCa floor member 2 without burying the slab lower end reinforcement 20 in the half PCa floor member 2 in advance, and from the thick slab 11 to the strip-like edge member 7, thin wall You may comprise by arranging a bar over the slab 12. FIG. These thick-walled joint bars 27, the post-cast concrete 10 of the thick-walled slab 11, and the post-cast concrete 10 (edge concrete portion 70) of the strip-shaped edge member 7 are integrally cast, The rigid joining of the thick slab 11 of the slab 1 is ensured.

  A plurality of thin-walled joint bars 28 are arranged at appropriate intervals in the length direction of the strip-shaped edge member 7 across the strip-shaped edge member 7 and the thin-walled slab 12. The thin-walled joint bar 28 includes a middle-stage thin-wall joint bar 28a disposed at the middle step in the vertical direction of the belt-like edge member 7, and a lower-stage thin-wall joint bar 28b disposed on the lower side. In the middle thin-walled joint bar 28a, the slab upper end bar 22 embedded in the cast concrete 10 of the thin-walled slab 12 is extended to the inside of the belt-like edge member 7, and the plate-like light weight of the bulk upper portion 4 in the belt-like edge member 7 is obtained. The member 3 is slightly inclined upward and is fixed in the post-cast concrete 10 (edge material concrete portion 70) of the strip-shaped edge material 7. The end of the middle thin-walled joint bar 28 a may extend into the thick slab 11.

  The lower thin-walled joint bars 28b are arranged on the upper surface of the half PCa floor member 2 from the thin-walled slab 12 to the strip-shaped edge member 7 and the thick-walled slab 11, and are composed of reinforcing bars embedded in each of the cast concretes 10. Yes. In the present embodiment, the lower thick-walled joint bar 27b is also used. The lower thin-walled joint bar 28b may be provided separately from the lower thick-walled joint bar 27b. The strip-shaped edge member 7 and the thin-walled slab are formed by integrally casting the thin-walled joint bars 28, the post-cast concrete 10 of the thin-walled slab 12 and the post-cast concrete 10 (edge material concrete portion 70) of the strip-shaped edge member 7. 12 is secured.

  The belt-like edge member 7 configured in this manner is a member having a function as a slab, and a function capable of transmitting energy generated by vibration between the thin slab 12 and the thick slab 11 to a slab support member such as the beam 6. If it is secured. Accordingly, the belt-like edge member 7 is not required to have a proof strength as a beam supporting the slab, and does not need to be a member that linearly connects the beams. The rigidity of the strip-shaped edge member 7 as a member may be larger than that of the thick and thin slabs 11 and 12 having the same width, and the cross-sectional shape may be a horizontally long flat. For this reason, the strip | belt-shaped edge material 7 can change the side surface position freely according to the thickness of the slab 1, and the setting range of the thick-walled slab 11 and the thin-walled slab 12, and makes the cross-sectional shape of the strip-shaped edge material 7 flat. be able to. However, it does not deny that the belt-like edge member 7 has the same form as the beam depending on the installation form of the belt-like edge member 7. That is, the difference between the strip-shaped edge member 7 and the form of the beam is not discussed but the difference is judged from the function.

  The strip-shaped edge member 7 has a distance from the strip-shaped edge member 7 to the column 8 or beam 6 that supports the slab 1 to the slab 1 in the bending wave restraining region 5 surrounded by the band-shaped edge member 7 and the column 8 or beam 6. Is set to be equal to or less than the wavelength of the bending wave with a predetermined shock frequency. The number of the strip-shaped edge members 7 formed on the slab 1 and the bending wave restraining regions 5 surrounded by the columns 8 and the beams 6 varies depending on the number of the strip-shaped edge members 7 formed on the slab 1. The distance between the column 8 or the beam 6 and the strip-shaped edge member 7 is the distance between the opposing side surfaces, and the column 8 or the beam 6 that the strip-shaped edge member 7 “opposes” is the length of the strip-shaped edge member 7. It means the column 8 or the beam 6 located in the normal direction on the plan view of the side surface at an arbitrary position in the vertical direction. In the present embodiment, the slab 1 is supported by the pillars 8 as structural members at the four corners, but the distance between the belt-like edge member 7 and the pillar 8 is shorter than the distance between the belt-like edge member 7 and the beam 6. Therefore, if the distance of the beam 6 is ensured, the positional relationship between the beam 6 and the strip-shaped edge member 7 will be described below assuming that the distance from the column 8 is ensured.

  In the slab 1 in the present embodiment, two bending wave restraining regions 5 surrounded by the belt-like edge member 7 and the beam 6 are formed. That is, the slab 1 is surrounded by the strip-shaped edge member 7 and the veranda side beam 60, the first and second beams 62 and 63 in the X direction, and the first slab region 13 in which the bulky portion 4 is formed, and the strip-shaped member 7. And the corridor side beam 61, the X direction first and second beams 62 and 63, and the second slab region 14 in which the bulk upper portion 4 is not formed is formed. The slab 1 in the first slab region 13 is formed by a thick slab 11, and the slab 1 in the second slab region 14 is formed by a thin slab 12.

  The distance from the veranda-side side surface of the belt-like edge member 7 to the veranda-side beam 60 is the first value surrounded by the belt-like edge member 7 and the veranda-side beam 60, the first and second beams 62 and 63 in the X direction, and the belt-like edge member 7. It is set to be equal to or less than the wavelength λb11 of the bending wave due to a predetermined impact frequency to the thick slab 11 in one slab region 13. Further, the distance from the side surface on the corridor side of the strip-shaped edge member 7 to the corridor-side beam 61 is surrounded by the strip-shaped edge member 7 and the corridor-side beam 61, the first and second beams 62 and 63 in the X direction, and the strip-shaped edge member 7. The second slab region 14 is set to be equal to or less than the wavelength λb12 of the bending wave due to a predetermined impact frequency to the thin slab 12.

  That is, regarding the two bending restraint regions of the slab 1 of the present embodiment, the arrangement position of the strip-shaped edge member 7 is the first slab region 13 in which the bulk upper portion 4 is formed among the bending wave restraint regions 5 and 5. The distance from the belt-like edge member 7 to the veranda side beam 60 that supports the slab 1 is set to be equal to or less than the wavelength λb11 of the bending wave due to a predetermined impact frequency to the slab 1 in the first slab region 13, that is, the thick slab 11. As for the second slab region 14 where the bulky upper portion 4 is not formed among the bending wave restraining regions 5, 5, the distance from the strip-shaped edge member 7 to the corridor side beam 61 supporting the slab 1 is within the second slab region. 14 slabs 1, that is, thin-walled slabs 12 are set to be less than or equal to the wavelength λb12 of the bending wave with a predetermined impact frequency.

In the present embodiment, the strip-shaped edge member 7 has a wavelength λb of a bending wave due to a predetermined impact frequency on the slab 1 in which the distance between the beam 6, that is, the corridor side beam 61 and the veranda side beam 60, It is set as follows. Here, the wavelength λb of the bending wave is calculated by the following equation (1). As can be seen from Equation (1), the wavelength λb of the bending wave varies depending on the impact frequency of the impact vibration input (hereinafter also referred to as excitation force) of the floor impact sound impact source applied to the floor slab. The impact frequency is the reciprocal (unit: Hz) of the numerical value obtained by doubling the impact time. The predetermined impact frequency in the present embodiment is a frequency corresponding to the frequency of the heavy floor impact sound (for example, JIS A 1418-2000 “Measurement Method of Floor Impact Sound Sound Insulation Performance of Buildings Part 2: Method Using Standard Weight Impact Sound Source”) The impact frequency of the Bang machine, which is the impact source of the heavy floor impact sound defined in (1), is 25 Hz). As can be seen from the equation (1), the wavelength λb of the bending wave varies depending on the attributes of the floor slab, such as Young's modulus, density, and equivalent thickness of the floor slab. The equivalent thickness of the floor slab is obtained by converting a void slab or the like into a uniform single plate floor slab based on a uniform single plate floor slab of ordinary concrete.

  The operation of the floor slab structure according to the present embodiment described above will be described. In the above-mentioned Patent Document 2, the vibration restraining member refers to a member that acts as a fixed end with respect to a slab as a medium for transmitting vibration and restrains vibration of the slab caused by an impact on the slab in the vicinity thereof. The degree to which the vibration generated in the slab is restrained by the vibration restraint member (hereinafter referred to as “vibration restraint”) is related to the distance from the vibration restraint member, and the vibration restraint is generally higher in the vicinity of the vibration restraint member. More specifically, the vibration restraint is related to the wavelength λb of the bending wave (transverse wave) propagating through the slab.

  Further, in Patent Document 2 described above, vibration restraint can be obtained in the region of the slab up to a distance of about half wavelength (0.5λb) of the wavelength λb of the bending wave (transverse wave) propagating from the beam to the slab. At the same time, it is shown that vibration restraint can be obtained even in the region of the slab from the step portion of the slab to a distance of about half the wavelength (0.5λb) of the bending wave (transverse wave) wavelength λb. . Accordingly, it is shown that the stepped portion provided in the slab can be handled in the same manner as a vibration restraining member such as a structural beam or a load bearing wall as a member restraining the vibration of the slab. In other words, in the case of the stepped portion and the vibration restraining member, the slab is located at a distance exceeding the half wavelength (0.5λb) of the wavelength λb of the bending wave (transverse wave) from the stepped portion or the vibration restraining member. This indicates that sufficient vibration restraint cannot be obtained in the region. Therefore, if there is a slab region in the slab where vibration restraint cannot be obtained from either the stepped portion or the vibration restraining member, floor impact sound cannot be effectively blocked by the slab.

  Each beam 60-63 in this embodiment is a vibration restraint member which restrains the displacement by the vibration (vibration with respect to a heavy floor impact sound) by the impact to the slab 1 which generates a heavy floor impact sound. This vibration constraining member means the above-described vibration constraining member that “constrains the vibration of the slab caused by the impact on the slab in the vicinity thereof”. Moreover, the strip | belt-shaped edge material 7 in this embodiment is a member which comprises a level | step difference, and means the above-mentioned "step part". Therefore, vibration restraint is provided in each beam 60 to 63 or in the region of the slab 1 up to a distance of about half wavelength (0.5λb) of the wavelength λb of the bending wave caused by the predetermined impact frequency from the strip-shaped edge member 7 to the slab 1. Is obtained. In the following description, the “vibration restraint material” includes the belt-like edge material 7 of the present embodiment.

  The distance between the belt-like edge member 7 as the vibration restraining material and the veranda side beam 60 with respect to the first slab region 13 constituting the slab 1 of the present embodiment is equal to or less than the bending wavelength λb11 of the thick slab region 11 of the first slab region 13. Therefore, from the side surface of the veranda side beam 60 facing the strip-shaped edge member 7, the half wavelength (hereinafter referred to as “0.5λb11”) of the bending wavelength λb11 of the thick slab region 11 or the veranda side of the strip-shaped edge member 7 All of the first thick slab region is included in the range of 0.5λb11 from the side surface. Thereby, the vibration with respect to the heavy floor impact sound which the strip | belt-shaped edge material 7 and the veranda side beam 60 generate | occur | produce in the 1st slab area | region 13 can be restrained.

  Similarly, since the distance between the strip-shaped edge member 7 as the vibration restraining material and the hallway side beam 61 with respect to the second slab region 14 is equal to or less than the bending wavelength λb12 of the thin-walled slab 12, The second slab is located within the range of 0.5λb12 from the side surface facing the strip edge 7 of the bending side λb12 of the thin-walled slab 12 (hereinafter referred to as “0.5λb12”) or the corridor side beam 61 from the opposite side surface. All of region 14 is included. Thereby, the strip | belt-shaped edge material 7 and the corridor side beam 61 can restrain the vibration with respect to the heavy floor impact sound which generate | occur | produces in the 2nd slab area | region 14. FIG.

  The enforcement of the floor slab structure of this embodiment will be described. Prior to the work at the construction site, a half PCa floor member 2 is formed in advance by embedding a slab lower end reinforcing bar 20 and a truss-like reinforcing bar 21 in a concrete plate 19 of a predetermined size in a factory or the like. The upper part of the truss-shaped reinforcing bar 21 is formed by projecting upward from the concrete plate 2a. In the half PCa floor member 2 serving as a slab form of the belt-like edge member 7, a lower bending reinforcement bar 23 and a vertical reinforcement bar 25 engaged therewith are also embedded at the position of the belt-like edge member 7. The lower bending reinforcement bars are disposed in the vicinity of the left and right corners of the lower portion of the cross section of the strip-shaped edge member 7. The U-shaped lower vertical reinforcing bars 25b constituting the vertical reinforcing bars 25 are engaged with the left and right lower bending reinforcing bars 23 and embedded in the half PCa floor member 2, and the ends thereof project upward from the concrete plate 2a. To mold. The lower vertical reinforcing bars 25 b are arranged at appropriate intervals in the length direction of the strip-shaped edge member 7.

  At the construction site, on the lower floor slab of the RC apartment building, column reinforcement and the wall of the door wall 9 are placed, and a formwork is installed around the reinforcement, and the beam is arranged between the column reinforcements. Make a streak and install a beam form around it, supporting it from the slab on the lower floor. The half PCa floor member 2 as a slab mold is flatly arranged between the beam molds while being supported from the lower slabs between the assembled beam molds. Since no step is provided at the bottom of the slab, the laying operation of the half PCa floor member 2 is facilitated. The half PCa floor member 2 in which the lower bending reinforcing bars 23 and the like are previously embedded is disposed at a position where the strip-shaped edge member 7 is formed. Next, a light plate-like lightweight member 3 of about 400 mm in length and width is placed on a portion where the bulky upper portion 4 on the upper surface of the half PCa floor member 2 is disposed, with a truss-like reinforcing bar 21 protruding from the upper surface of the half PCa floor member 2 interposed therebetween. Place and fix in the X and Y directions with a gap. After the plate-shaped lightweight member 3 is arranged, the upper bending reinforcement bar 24 of the strip-shaped edge member 7 is arranged. The upper bending reinforcement bars 24 are arranged in the vicinity of both corners of the upper section of the belt-like edge member 7. The ends of the upper bending reinforcing bars 24 are extended to the first and second beams 62 and 63 in the X direction and fixed.

  Next, an upper U-shaped vertical reinforcing bar 25a of the vertical reinforcing bar 25 is arranged so as to cover the left and right upper bending reinforcing bars 24, and an end portion of the upper vertical reinforcing bar 25a protrudes on the half PCa floor member 2. A square-shaped vertical reinforcing bar 25 is formed by connecting with the end of the reinforcing bar 25b. Next, the lower thick-wall joint bar 27b (also used as the lower thin-wall joint bar 28b) extends from the thick slab 11 to the belt-like edge member 7 and the thin-wall slab 12 at appropriate intervals in the length direction of the belt-like edge member 7. To do. The slab upper end reinforcement 22 of the thin slab 12 is arranged in the XY direction above the half PCa floor member 2. At this time, the end of the slab upper end reinforcement 23 on the side of the belt-like edge member 7 extends into the belt-like edge member 7, and inclines toward the upper side of the plate-like lightweight member 3 of the thick slab 11 within the belt-like edge member 7. Let The slab upper end reinforcement 22 of the thick slab 11 is arranged in the X and Y directions above the plate-like lightweight member 3. At this time, the end portion of the slab upper end reinforcement 22 on the belt-like edge member 7 side is placed on the upper part of the upper bending reinforcement bar 24, and the end portion is lowered along the side surface of the belt-like edge member 7 on the thin slab 12 side. Bending to secure the fixing length to the strip-shaped edge member 7 and arrange the bars.

  At the stage where the slab reinforcement is completed, the thick slab 11, the thin slab 12, and the cast concrete 10 of the strip-shaped edge member 7 are cast in series. By placing the cast concrete 10 in series, the slab 1 in which the thick slab 11, the thin slab 12, and the strip-shaped edge material 7 are integrated is constructed. After the concrete is hardened, the support is removed and the formwork is disassembled to construct the slab structure according to the present invention.

  As described above, in the slab structure according to the present embodiment, the post-cast concrete 10 is placed above the plate-like lightweight member 3 partially placed on the half PCa floor member 2. The slab 1 in which the bulky upper part 4 is formed integrally with the half PCa floor member 2 has a predetermined width along the edge 4a of the bulky part 4 and has higher rigidity than the slab 1, and is rigid with the slab 1. A belt-like edge member 7 having both ends rigidly joined to the column 8 and the beam 6 supporting the slab 1 is formed, and the distance from the belt-like edge member 7 to the column 8 and the beam 6 supporting the slab 1 is formed. Is set to be equal to or less than the wavelength λb of the bending wave caused by the predetermined impact frequency to the slab 1 in the bending wave restraining region 5 surrounded by the belt-like edge member 7 and the column 8 or the beam 6. Using the lightweight member 3, the bottom is flat and a step is formed on the top surface of the slab 1 Without lowering the workability of the slab 1 having a bulk upper 4 to the vibration by utilizing the band edge member 7 as the vibration restraining member of the slab 1 it is possible to construct a slab 1 constrained. That is, a slab having a step on the upper surface can be constructed as a slab 1 that can restrain vibration against heavy floor impact sound without reducing construction efficiency. Moreover, since the edge part of the strip | belt-shaped edge material 7 is rigidly joined to the beam 6, the band-shaped edge material 7 can be functioned reliably as a member which restrains the vibration of the slab 1. FIG.

  Of the bending wave restraining region 5 of the slab 1, for the first slab region 13 in which the bulky portion 4 is formed, the distance from the belt-like edge member 7 to the veranda side beam 60 that supports the slab 1 is For the second slab region 14 which is set to be equal to or less than the wavelength λb11 of the bending wave due to a predetermined impact frequency to the floor slab, that is, the thick slab 11, and in which the bulk upper portion 4 is not formed, Since the distance from the material 7 to the corridor side beam 61 supporting the slab 1 is set to be equal to or less than the wavelength λb12 of the bending wave due to a predetermined impact frequency to the slab 1 in the second slab region 14, that is, the thin slab 12. The strip-shaped edge member 7 can function as a member that restrains the vibrations of the first and second slab regions 13 and 14 located on both sides of the strip-shaped edge member 7, and the strip-shaped edge member 7 is effectively used to make the slab 1. The vibration can be constrained in the entire area.

  The strip-shaped edge member 7 is formed of the half-PCa floor member 2 and the post-cast concrete 10 placed upward. The half-PCa floor member 2 is embedded with the lower bending reinforcement 23 and the upper-cast concrete 10 is bent upward. Reinforcing bars 24 are embedded, and are engaged with the lower bending reinforcing bars 23 and the upper bending reinforcing bars 24, and the vertical reinforcing bars from the half PCa floor member 2 to the post-cast concrete 10 at appropriate intervals in the length direction of the strip-shaped edge member 7. 25 is embedded, and the transverse joint bars 28 are embedded from the slab 1 to the post-cast concrete 10 of the strip member 7, whereby the rigidity of the strip edge material 7 is secured, and the thick slab 11, the thin slab 12, and the strip edge The material 7 is firmly joined, and the bending wave restraint region 5, that is, the vibrations of the first and second slab regions 13 and 14, are integrated with the structural member such as the column 8 and the beam 6 and the belt-like edge member 7. It can be reliably restrained.

  In this embodiment, the perimeter of the floor slab is surrounded by the pillars 8 and the beams 6. However, instead of the beams 6, a seismic wall that directly supports the slab 1 may be used. A wall ramen structure may be used. In the case of a wall-type structure, the wall beam functions as a beam in this embodiment, and in the case of a wall-type frame structure, a wall column (bearing wall) functions as a column in this embodiment. Even in these cases, the same effect as that obtained when the beam 6 is used as the vibration restraining material of the slab 1 can be obtained.

  The shape of the edge 4a of the bulky portion 4 of the present embodiment, that is, the strip-shaped edge member 7, does not have to be a straight line, and may be formed in a shape having a curve or unevenness. Further, the edge 4 a of the bulky portion 4, that is, the belt-like edge member 7 may be formed obliquely with respect to the veranda side beam 60. Moreover, although the width | variety of the strip | belt-shaped edge material 7 was made uniform in the length direction, for example, the width | variety of the connection part with the X direction 1st beam 62 is shrunk, and it goes to the X direction 2nd beam 63, and You may form so that a width | variety may be expanded. In the above-described deformation mode, unevenness is generated at the position of the side surface due to the mounting mode of the plate-like lightweight member 3. The edge 4a in this state is set as a surface that smoothly connects each convex corner of the side surface of the plate-like lightweight member 3.

  In this embodiment, the three-way edge portion of the bulk upper portion 4 is formed in contact with the beam 6, and one strip-shaped edge member 7 is provided on the remaining edge portion. However, as in the second embodiment shown in FIG. 4 are in contact with the parallel beam 6 (first and second beams 62 and 63 in the X direction), and the strip-shaped edge members 7 and 7 are formed on the remaining two parallel edges 4a and 4a. May be. In this case, the strip-shaped edge members 7 and 7 are formed to face each other, and the distance between the strip-shaped edge members 7 and 7 is set to the slab 1 in the region sandwiched between the strip-shaped members 7 and 7, that is, the thick-walled slab 11. The bending wave wavelength λb11 or less for a predetermined impact frequency is set. As a result, the first slab region 13 is formed, which is surrounded by the belt-like members 7 and 7 and the first and second beams 62 and 63 in the X direction and in which the bulk upper portion 4 is formed. Both belt-like members 7 and 7 can be restrained.

  Further, as in the third embodiment shown in FIG. 4, the corridor-side beam 61 and the second X-direction beam in which the two directions of the second slab region that does not have the bulky portion 4 are orthogonal to the bending wave restraining region 5 of the slab 1. The bulky portion 7 may be formed on the slab 1 so as to be in contact with the beam 63. In this case, the strip-shaped edge member 7 is formed in an L shape along the bulky portion 4. The distance between the L-shaped belt-like edge member 7 and the veranda side beam 60 or the X-direction first beam 62 is maximum at the corners of the L shape. By setting this distance to be less than or equal to the wavelength λb11 of the bending wave, it becomes possible to constrain the vibration of the entire first slab region 13 by the belt-like edge member 7, the veranda side beam 60, and the X direction first beam 62. Alternatively, the belt-like edge member 7 may be formed so that the distance between the beams 6 facing each L-shaped side is set to be equal to or less than the wavelength λb11 of the bending wave, and the first slab region 13 is partially subjected to vibration restraint. In addition, the distance with the L-shaped corner | angular part of the strip | belt-shaped edge material 7 is a distance from a corner | angular edge front, and the point equidistant from a corner | angular part is located on the same circle centering on a corner | angular front-end | tip.

  Further, as in the fourth embodiment shown in FIG. 5, the second slab region 14 is formed so as to be in contact with one beam 6 (X-direction second beam 63), and the strip-shaped edge member 7 is formed along the edge 4a. You may form in U shape.

  Further, as shown in FIG. 6, the first slab regions 13 and 13 and the second slab regions 14 and 14 respectively formed by connecting two slabs 1 and 1 shown in the third embodiment to each other are the beams 6. The slab 1 may be continuously constructed so as to be continuous across the wall.

  In each of the above-described modified embodiments, the same effects as those of the first embodiment can be obtained.

It is a top view which shows the floor slab in suitable 1st embodiment of the slab structure which concerns on this invention. It is sectional drawing of the strip | belt-shaped edge material part of FIG. It is a top view which shows the floor slab in suitable 2nd embodiment of the slab structure which concerns on this invention. It is a top view which shows the floor slab in suitable third embodiment of the slab structure which concerns on this invention. It is a top view which shows the floor slab in suitable 4th embodiment of the slab structure which concerns on this invention. It is a top view which shows the condition which has arrange | positioned two floors of the floor slab and its deformation | transformation floor slab in suitable 3rd embodiment of the slab structure which concerns on this invention continuously.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor slab 2 Half PCa floor member 3 Lightweight member 4 Bulk upper part 4a Edge part 7 Strip-like edge material 10 Post-cast concrete 13 First slab area 14 Second slab area 23 Upper bending reinforcement bar 24 Lower bending reinforcement bar 25 Vertical reinforcement bar 26 Transverse joint

Claims (4)

A floor slab having a slab in which post-cast concrete is placed above a plate-like lightweight member partially placed on the half PCa floor member and a bulk upper portion is formed integrally with the half PCa floor member. Structure,
A belt-like edge having a predetermined width along the edge of the bulky portion and having a rigidity higher than that of the slab and rigidly joined to the slab and having both ends rigidly joined to a structural member supporting the slab. Forming the material,
The distance from the strip edge to the structural member that supports the slab is less than or equal to the wavelength of the bending wave due to a predetermined impact frequency to the slab in the bending wave restraining region surrounded by the strip and the structural member. Floor slab structure characterized by being set. For the first slab region in which the upper part of the bending wave is constrained, the distance from the strip-shaped edge material to the structural member that supports the slab is set to the slab in the first slab region. It is set below the wavelength of the bending wave with a predetermined shock frequency,
The second slab region in which the upper part of the bending wave is not formed has a predetermined distance from the strip-shaped edge material to the structural member that supports the slab to the slab in the second slab region. The floor slab structure according to claim 1, wherein the floor slab structure is set to be equal to or less than a wavelength of a bending wave due to an impact frequency.   The band-shaped edge members are formed to face each other, and the distance between the band-shaped edge members is set to be equal to or less than the wavelength of the bending wave with respect to a predetermined impact frequency to the slab in the region sandwiched between the band-shaped members. The floor slab structure according to claim 1 or 2, wherein the floor slab structure is provided. The strip-shaped rim material is formed of post-cast concrete that has been laid upward with the half PCa floor member,
A lower bending reinforcing bar is embedded in the half PCa floor member, and an upper bending reinforcing bar is embedded in the post-cast concrete, and the lower edge bending reinforcing bar and the upper bending reinforcing bar are engaged with each other. A longitudinal reinforcing bar is embedded from the half PCa floor member to the post-cast concrete at an appropriate interval in the length direction, and a lateral joint bar is embedded from the slab to the post-cast concrete of the strip member. The floor slab structure according to any one of claims 1 to 3.

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