JP2005336714A - Vibration damping structure of slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping structure of a slab capable of following also to a creep deformation phenomenon of the slab while decreasing the vibration of the slab by effectively absorbing the oscillation of the slab at a low cost. <P>SOLUTION: In the vibration damping structure of the slab damping the vibration of the slab 4 by connecting between upper and lower slabs 4 of a multi-story building with a strut, the strut is equipped with a lower side strut member 9 erected on the upper surface of the downstairs slab 4, an upper side strut member 10 vertically hung down to the lower surface of the upstairs slab 4 and a damper member 11 consisting of a viscoelastic material, and the lower side strut member 9 and the upper side strut member 10 are so constituted that both of them are fitted to each other through the damper member 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibration damping structure for a slab of a multi-layer building.

  In recent apartment buildings, in order to ensure a large effective ceiling height in the room and to cope with the high level of the free plan, there is a tendency to avoid projecting the beam shape on the ceiling in the dwelling unit. The structure which omits or reduces as much as possible is common. In the case of such a structure, since the slab is formed between large spans to increase the area, vibration of the slab is likely to occur, and the insulation performance of heavy floor impact sound is also reduced.

In order to cope with the above-mentioned adverse effects caused by the omission of the beam, etc., a method of suppressing the vibration of the slab by increasing the slab rigidity by increasing the slab thickness is considered. However, if the slab thickness is increased, the effective ceiling height is increased. Not only lowers but also increases cost. Conventionally, there is a method of installing a double floor or the like having a vibration damping effect, but the effect cannot be expected so much. Therefore, in recent years, a structure in which the upper and lower slabs are connected by a support column has been proposed. Accordingly, vibration of the slab can be suppressed without increasing the slab thickness (see, for example, Patent Document 1).
JP 2003-41684 A

  However, in the above-described conventional slab vibration control structure, the columns installed between the slabs are maintained at a certain length, and the upper and lower slabs are rigidly joined. There is a risk of damage. In addition, there is a problem that the strut cannot follow the creep deformation caused by the load applied to the slab for a long time. If the slabs are connected by a column that cannot follow creep deformation, when a creep deformation phenomenon occurs, an excessive pressing force or pulling force is applied to the slab, and the slab may be damaged.

  The present invention takes the above-described conventional problems into consideration, and can effectively follow the slab creep deformation phenomenon while absorbing vibration of the slab and reducing vibration of the slab at low cost and effectively. The purpose is to provide a vibration control structure for slabs.

  According to the first aspect of the present invention, in the vibration suppression structure of a slab that suppresses vibration of the slab by connecting the upper and lower slabs of the multi-layer building with the support, the support is erected on the upper surface of the lower slab. A lower strut member, an upper strut member suspended from the lower surface of the slab on the upper floor, and a damper member made of a viscoelastic body, and the lower strut member and the upper strut member include the damper member It is characterized by being fitted through.

  According to the vibration suppression structure for a slab according to the present invention, the upper and lower slabs are connected by the support column, and the lower support member and the upper support member are fitted via the damper member. The vibration of the slab can be effectively reduced by absorbing the vibration of the slab, and when the creep deformation phenomenon occurs, the damper member becomes non-linear, and the overall length of the strut corresponds to the actual vertical slab interval An appropriate length can be maintained. Further, since the damper member is made of a viscoelastic body, the support column can be manufactured at low cost, and the vibration damping structure for the slab according to the present invention can be provided at low cost.

  FIG. 1 is a cross-sectional view of a building according to the present embodiment. As shown in FIG. 1, this building is a multi-layered building such as an apartment house, and its schematic configuration is a column 1, a large beam 2, a door wall 3, and a reinforced concrete slab 4. In this building, a plurality of partition walls 5 are provided between the upper and lower slabs 4. Each dwelling unit is partitioned by the partition walls 5, and a plurality of living rooms are formed in each dwelling unit. Moreover, the double ceiling 6 and the double floor 7 are each formed in each dwelling unit.

  In the above-mentioned building, the beam is omitted, and the effective ceiling height in the dwelling unit is sufficiently secured, while the entire slab 4 is a single large area floor slab. Since the slab 4 with a large area is likely to vibrate, there is a concern about the decrease in the comfortability due to the slight vibration and the decrease in the performance of blocking the heavy floor impact sound against the lower floor dwelling units. The vibration control structure which suppresses is applied.

  Hereinafter, the first and second embodiments of the slab damping structure will be described with reference to the drawings.

[First Embodiment]
As shown in FIG. 1, a support column 8 that connects the upper and lower slabs 4 is accommodated in the partition wall 5. Even if the support column 8 is installed at a position where it is exposed to the room, there is no functional problem. The support column 8 includes a lower support member 9 erected on the upper surface of the slab 4 on the lower floor, an upper support member 10 suspended on the lower surface of the slab 4 of the upper floor, and a damper member 11 made of a viscoelastic body. Has been.

  FIG. 2A is a longitudinal sectional view of the column 8. As shown in FIG. 2A, the lower support member 9 includes a shaft portion 12 made of a square steel pipe having a cross-sectional dimension of 90 mm × 90 mm and a thickness of 3.2 mm, and fillet welded to the lower end portion of the shaft portion 12. The base portion 13 is made of a steel plate and the level adjusting means 14 is provided at the central portion of the base portion 13. Since the shaft portion 12 uses a steel pipe having a small outer dimension of 90 mm × 90 mm, the column 8 can be accommodated in the partition wall 5. Of course, the shaft portion 12 may have a smaller outer dimension.

  The base portion 13 also projects like a bowl from the outer peripheral surface of the shaft portion 12, and a plurality of (for example, four) holes 13a are formed at equal intervals in the projected portion. A post-construction anchor bolt 15 driven into the upper surface of the lower floor slab 4 is inserted into the hole 13a, and the base portion 13 is bolted to the lower floor slab 4 by the post-construction anchor bolt 15 and the nut 16. Yes. The base portion 13 is disposed with a gap between the upper surface of the lower slab 4 and a filler 17 made of non-shrink mortar or the like is interposed between the base portion 13 and the lower slab 4. Has been.

  The level adjusting means 14 adjusts the position of the column 8 in the vertical direction, and is composed of a level adjusting bolt 18 extending in the vertical direction and a level adjusting nut 19 disposed below the base portion 13. Yes. The level adjustment bolt 18 is inserted into a hole 13b formed in the center of the base portion 13 so as to be movable up and down, and the level adjustment nut 19 is screwed into a lower end portion of the level adjustment bolt 18 protruding below the base portion 13. Has been.

  FIG. 2B is a partially enlarged view of a joint portion between the upper column member 10 and the slab 4 on the upper floor, and FIG. 3 is a cross-sectional view taken along a line AA shown in FIG. As shown in FIGS. 2A, 2 </ b> B, and 3, the upper column member 10 is suspended from the top plate portion 20 made of a rectangular steel plate in contact with the bottom surface of the slab 4 on the upper floor, and the top plate portion 20. It is comprised from the insertion part 21 which consists of several L-shaped angle piece 23. FIG.

  Holes 20a are respectively formed in the four corners of the top plate portion 20, and stud bolts 24 for attaching the fitting portions 21 are attached to the lower surface of the top plate portion 20 at positions between the adjacent holes 20a. . A post-construction anchor bolt 26 that is driven into the bottom surface of the upper floor slab 4 is inserted into the hole 20a, and the top plate portion 20 is bolted to the upper floor slab 4 by the post-construction anchor bolt 26 and the nut 22. Yes.

  A hole 23b through which the stud bolt 24 is inserted is formed in the horizontal portion 23a of the L-shaped angle piece 23 constituting the inserted portion 21, and the L-shaped angle piece 23 is formed in the top plate portion 20 by the stud bolt 24 and the nut 25. Bolts are fixed. The L-shaped angle pieces 23 are respectively disposed on the four sides of the upper end of the shaft portion 12 of the lower column member 9 and are disposed in a cross shape with the shaft portion 12 as the center. The plurality of L-shaped angle pieces 23 are installed such that the opposing vertical portions 23 c face each other, the back surface of the vertical portion 23 c of the L-shaped angle piece 23 and the upper end portion of the lower column member 9. Are opposed to each other with a predetermined interval. Thus, the insertion part 21 is a sheath-like thing which the upper end of the shaft part 12 is loosely inserted with a gap of about 1 mm.

  The fitted portion 21 of the upper column member 10 and the upper end of the shaft portion 12 of the lower column member 9 are fitted via a damper member 11 made of a viscoelastic body. This viscoelastic body is a sheet made of rubber asphalt having a thickness of about 1 mm extending in the vertical direction, and is interposed between the back surface of the vertical portion 23c of the L-shaped angle piece 23 and the side surface of the upper end portion of the shaft portion 12. The sheet-like damper member 11 thus formed is adhesively bonded to the back surface of the vertical portion 23 c and the side surface of the shaft portion 12.

  It is most effective to install the support column 8 at a position where the amplitude of the vibrating slab 4 becomes the largest, that is, a position where the vibration slab 4 becomes an antinode. Is not very effective. Therefore, it is desirable to grasp the vibration characteristics in consideration of the area and shape of the slab 4 and to install the column 7 at a position where the vibration can be most effectively controlled.

  Further, the support columns 8 do not need to be continuously arranged in the vertical direction with the slab 4 interposed therebetween, and as shown in FIG. In this case, the slab 4 sandwiched between the slabs 4 is connected to the slabs 4 on the upper and lower floors at two locations. In some cases, the vibration damping effect may be improved as compared with the case where the antenna is disposed in the case.

  Next, a method for constructing a vibration control structure for a slab having the above-described configuration will be described.

  First, the lower support member 9 is assembled. Specifically, the base portion 13 is fillet welded to the lower end surface of the shaft portion 12, and the level adjusting bolt 18 having the level adjusting nut 19 screwed into the hole 13 b at the center portion of the base portion 13 is inserted into the base portion. A level adjusting means 14 is attached to 13. Further, the fitted portion 21 is attached to the upper end portion of the shaft portion 12 via the damper member 11.

  On the other hand, a plurality of post-installed anchor bolts 15 are driven into the upper surface of the lower slab 4 at predetermined locations located in the partition wall 5, and a plurality of post-installed anchors are installed on the bottom surface of the upper slab 4 positioned vertically above it. Each bolt 26 is driven. Then, the top plate portion 20 is opposed to the bottom surface of the slab 4 on the upper floor, and the lower end portions of the plurality of post-installed anchor bolts 26 protruding from the bottom surface of the slab 4 on the upper floor are respectively inserted into the holes 20a formed in the top plate portion 20. Fasten with nut 22. A plurality of stud bolts 24 are welded to the lower surface of the top plate portion 20.

  Next, the lower column member 9 to which the insertion portion 21 is attached via the damper member 11 is disposed between the upper surface of the slab 4 on the lower floor and the bottom surface of the slab 4 on the upper floor. At this time, the lower end surface of the level adjustment bolt 18 is in contact with the upper surface of the lower slab 4, and the height of the base portion 13 is adjusted by rotating the level adjustment nut 19. The level adjusting means 14 adjusts the installation level of the column 8.

  And while fixing the base part 13 to the upper surface of the slab 4 of a lower floor, the to-be-inserted part 21 is bolt-fixed to the lower surface of the top-plate part 20. As shown in FIG. Specifically, the upper ends of a plurality of post-installed anchor bolts 15 protruding from the upper surface of the slab 4 on the lower floor are inserted into holes 13a formed at the four corners of the base portion 13 and fastened with nuts 16; A stud bolt 24 attached to the top plate portion 20 is inserted into a hole 23 b formed in the horizontal portion 23 a of the shaped angle piece 23 and fastened with a nut 25.

  Finally, the periphery of the base portion 13 is surrounded by a mold (not shown), and a highly fluid filler 17 having excellent filling performance is injected into the mold. Then, after the filler 17 is solidified, the mold (not shown) is removed, and the construction of the vibration suppression structure for the slab is completed.

[Second Embodiment]
4 is a vertical cross-sectional view of the upper end portion of the support column 100, and FIG. 5 is a cross-sectional view taken along the line BB shown in FIG. 4 and 5, the lower column member 101 has the same configuration as that of the first embodiment described above, and the lower column member 101 has a cross-sectional dimension of 90 mm × 90 mm and a thickness of 3 mm. A shaft portion 102 made of a 2 mm square steel pipe is provided. The upper column member 103 includes a top plate portion 105 made of a rectangular steel plate in contact with the bottom surface of the slab 104 on the upper floor, and a fitted portion 107 made up of two cylindrical members 106 suspended from the top plate portion 105. .

  Holes 105a are respectively formed at the four corners of the top plate portion 105, and post-installed anchor bolts 108 that are driven into the bottom surface of the slab 104 on the upper floor are inserted into the holes 105a. The bolts are fixed to the upper slab 104 by anchor bolts 108 and nuts 109.

  The cylindrical member 106 includes an inner cylindrical member 110 made of a square steel pipe having a smaller cross-sectional size than the shaft portion 102 and an outer cylindrical member 111 made of a square steel pipe having a larger cross-sectional size than the shaft portion 102. The inner cylinder member 110 and the outer cylinder member 111 are each provided perpendicular to the top plate portion 105, and are fillet welded to the lower surface of the top plate portion 105. The inner cylindrical member 110 is disposed in the outer cylindrical member 111 with a predetermined (1.8 mm) gap between the outer peripheral surface of the inner cylindrical member 110 and the inner peripheral surface of the outer cylindrical member 111. ing.

  Between the outer peripheral surface of the inner cylindrical member 110 and the inner peripheral surface of the outer cylindrical member 111, the upper end portion of the shaft portion 102 is fitted and a damper member 112 made of a viscoelastic body is filled. The fitted portion 107 of the member 103 and the upper end of the shaft portion 12 of the lower column member 101 are fitted via a damper member 11 made of a viscoelastic body. This viscoelastic body is of a melt-molding type such as a styrene elastomer, and the damper member 112 is poured and solidified by pouring the melted viscoelastic body into a gap formed between the inner cylinder member 110 and the outer cylinder member 111. It is formed by letting. Further, the shaft portion 102 is disposed at the center between the outer peripheral surface of the inner cylindrical member 110 and the inner peripheral surface of the outer cylindrical member 111 without being offset in any direction, The thickness of the viscoelastic body interposed between the inner peripheral surface of the shaft portion 102 and the thickness of the viscoelastic body interposed between the inner peripheral surface of the outer cylindrical member 111 and the outer peripheral surface of the shaft portion 102. Sato is uniformly formed.

  Next, the construction of the slab vibration damping structure having the above-described configuration will be described.

  First, the upper column member 102 is formed by welding the inner cylinder member 110 and the outer cylinder member 111 to the lower surface of the top plate portion 105. Then, the upper column member 102 is turned upside down so that the tip of the shaft portion 102 is fitted between the inner cylinder member 110 and the outer cylinder member 111, and the melted viscoelastic body is poured and melt molded. At this time, the shaft portion 102 is arranged and held so that the thickness of the damper member 112 formed inside and outside the shaft portion 102 is uniform.

  On the other hand, as in the first embodiment, the post-construction anchor 108 is driven in advance into the upper and lower slabs 104. Then, after the viscoelastic body is solidified, the support column 100 is turned upside down and placed between the upper and lower slabs 104 and fixed to the post-construction anchor 108 with the bolt 109.

  According to the slab vibration damping structure having the configuration of the first and second embodiments described above, the upper and lower slabs are connected by the columns, and the lower column members 9 and 101 and the upper column members 10 and 103 are the dampers. Since the dampers 11 and 112 are fitted through the members 11 and 112, the vibration of the slabs 4 and 104 can be effectively absorbed by the damper members 11 and 112, and the creep deformation can be reduced. When the phenomenon occurs, the damper members 11 and 112 become non-linear, and the entire length of the support columns 8 and 100 can be maintained at an appropriate length according to the actual distance between the upper and lower slabs 4 and 104. Further, since the damper members 11 and 112 are made of a viscoelastic body, the support columns 8 and 100 can be manufactured at low cost, and the slab damping structure according to the present invention can be provided at a low cost.

  As mentioned above, although embodiment of the vibration suppression structure of the slab concerning this invention was described, this invention is not limited to above-described embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, the present invention is applied to a multi-layered building used for a newly built apartment house. However, the present invention may be applied to, for example, an office building and is not limited to an apartment house. Applicable to multi-story buildings. In addition, the columns 8 and 100 may be installed as repair or repair work for an existing building as well as a new building.

  In the above-described embodiment, the columns 8 and 100 are installed between the slabs 4 and 104 made of reinforced concrete, and the post-installed anchor bolts 15, 26 and 108 are driven into the slabs 4 and 104 to fix the columns 8 and 100. However, in the present invention, a void slab may be applied instead of the reinforced concrete slabs 4 and 104, and in this case, one-side bolts are used instead of the post-installed anchor bolts 15, 26 and 108.

  In the above-described embodiment, the lower column members 9 and 101 and the upper column members 10 and 103 are fitted via the damper members 11 and 112 at the upper ends of the columns 8 and 100. In the invention, the lower support member and the upper support member may be fitted to each other at the middle portion or the lower end portion of the support.

  In the above-described embodiment, the lower support members 9 and 101 are inserted into the upper support members 10 and 103. However, in the present invention, the upper support member is inserted into the lower support member. Alternatively, the support columns 8 and 100 in the above-described embodiment may be used upside down.

1 is an overall view for explaining a first embodiment of a vibration suppression structure for a slab according to the present invention. (A) is a longitudinal cross-sectional view for demonstrating 1st Embodiment of the vibration suppression structure of the slab based on this invention, (b) is the elements on larger scale. It is a cross-sectional view between AA shown to Fig.2 (a). It is a longitudinal cross-sectional view for demonstrating 2nd Embodiment of the vibration suppression structure of the slab which concerns on this invention. It is a cross-sectional view between BB shown in FIG.

Explanation of symbols

4,104 Slab 8,100 Post 9,101 Lower post 10,103 Upper post 11,112 Damper

Claims (1)

In the vibration control structure of the slab that suppresses the vibration of the slab by connecting the upper and lower slabs of the multi-layer building with a support column,
The support column includes a lower support member erected on the upper surface of the slab on the lower floor, an upper support member suspended on the lower surface of the slab of the upper floor, and a damper member made of a viscoelastic body.
The slab vibration damping structure, wherein the lower support member and the upper support member are fitted via the damper member.

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