JP4113569B1 - Floor support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED To rationally improve the impact shielding performance of a floor and to simplify the structure and construction when providing a floor on a floor slab.
In a floor support structure in which a floor large pull 12 is supported on a floor slab 11 via a support means 20, a joint portion between the floor slab 11 and the support means 20 due to an external force acting on the floor large pull 12. Due to the reaction force generated in the base plate, the support means 20 is deformed by a minute geometric movement within the elastic range, so that the bending moment Mc generated in the joint between the floor pulling 12 and the support means 20 is opposite to that of the support means 20. It is possible to generate a bending moment Mr.
[Selection] Figure 2

Description

  The present invention relates to a building floor support structure.

  Conventionally, when a floor is provided on a floor slab having an RC structure, the floor is directly supported by the floor slab.

  In the prior art, since the floor is directly supported by the floor slab, floor vibrations act directly on the floor slab. For this reason, it is necessary to increase the thickness of the floor slab in order to reduce vibrations downstairs and improve sound insulation.

  An object of the present invention is to rationally improve the impact shielding performance of the floor when providing the floor on the floor slab, and to simplify the structure and construction.

  According to the first aspect of the present invention, in the floor support structure in which the floor pull is supported by the floor slab or the beam via the support means, the floor slab or beam and the support means are joined due to an external force acting on the floor pull. The reaction force generated in the portion causes the support means to be deformed due to a minute geometric movement within the elastic range, so that the bending moment Mc generated in the joint between the floor pulling and the support means is opposite. The bending moment Mr can be generated.

  According to a second aspect of the present invention, in the first aspect of the present invention, the support means further comprises a rod pair comprising a combination of at least two rods, and the rod pair joins the upper ends of the rods to the floor pulling. The lower ends of these rods are joined to a floor slab or a beam so that the lower end interval is narrower than the upper end interval.

  According to a third aspect of the present invention, in the first aspect of the present invention, the support means further comprises a connection bar and a rod pair, the connection bar is joined in a state protruding from the floor pulling, and the rod pair is at least two. These rods have a combination of rods with the upper ends of the rods joined to the connecting bar, the lower ends of the rods joined to the floor slab or the beam, and the lower end intervals are made narrower than the upper end intervals. is there.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a beam is arranged immediately below a floor slab on which the support means is installed.

(Claim 1)
(a) When the bending moment Mc acts on the floor pulling from the floor, the horizontal force P acts on the supporting means, and a bending moment Mr in the opposite direction against the bending moment Mc is generated in the floor pulling. Therefore, the bending moment Mc and the bending moment Mr cancel each other, and the bending deformation of the floor pulling can be minimized. As a result, the floor pulling can have a certain bending resistance while reducing the cross section. Further, floor vibration due to walking on the floor or falling objects is suppressed, so that the sound insulation performance to the downstairs can be improved.

(Claim 2)
(b) The support means includes a rod pair comprising a combination of at least two rods, the rod pair joining the upper ends of the rods to the floor pull and joining the lower ends of the rods to the floor slab. The lower end interval was made narrower than the upper end interval. Therefore, when the bending moment Mc acts on the floor pulling from the floor and the axial force acts on the constituent rods of the rod pair, the bending moment Mr generated on the floor pulling due to the axial force of these rods is the bending moment. The direction is the opposite of Mc.

(Claim 3)
(c) The support means includes a connection bar and a rod pair, and the connection bar is joined in a state protruding from the floor pulling, and the rod pair is composed of a combination of at least two rods, and the upper ends of the rods are Joined to the connection bar, the lower ends of the rods were joined to the floor slab or beam, and their lower end spacing was narrower than the upper end spacing. Therefore, when the bending moment Mc acts on the floor pulling from the floor and the axial force acts on the constituent rods of the rod pair, the bending moment Mr generated on the floor pulling due to the axial force of these rods is the bending moment. The direction is the opposite of Mc.

  (d) By projecting the connection bar from the floor pulling, it becomes a gate type, the action point of the connection bar and the rod is lengthened, and the bending moment Mr can be effectively applied. Moreover, the inside of the connection bar can be secured as piping and wiring space.

(Claim 4)
(e) When the floor is provided on the floor slab, the floor is stably supported by the beams included in the floor slab through the floor pulling. Therefore, since the force and vibration transmitted from the support means can be received by the beam having strength, it is possible to rationally improve the impact shielding performance of the floor without having to thicken the entire floor slab.

  1 is a front view showing a floor support structure, FIG. 2 is a front view showing an enlarged main part of FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. 2, and FIG. FIG. 5 is a schematic diagram showing a floor support simple support structure, FIG. 6 is a schematic diagram showing a floor support pin support structure, and FIG. FIG. 8 is a schematic view showing a floor pulling support structure according to the present invention.

  The floor 10 of the building 1 in FIG. 1 is provided with support means 20 on a portion corresponding to a beam 11A such as a small beam or a large beam provided in an RC floor slab 11 (not limited to RC but may be steel or wooden). The floor large drawing 12 made of a square steel pipe or the like is supported, and the floor material 13 is laid on the floor large drawing 12. The support means 20 includes a connection bar 21 and a rod pair 22. In the floor slab 11, adjacent beams 11A have a span of 2 to 3 m.

  When the floor pulling 12 is supported on the beam 11A of the floor slab 11 with a span of 2 to 3 m, the support structure is as shown in FIGS. . A beam 11A is arranged directly below the floor slab 11 on which the support means 20 is installed.

  That is, the connection bar 21 is rigidly joined to a position corresponding to each beam 11 </ b> A of the floor slab 11 at a plurality of positions in the longitudinal direction of the floor pulling 12. The connecting bar 21 is made of U-shaped steel, embraces both sides of the floor pulling 12 at the end of the side plates 21A that are longer than the side height of the floor pulling 12, and puts the side plates 21A on both sides of the floor pulling 12. The bottom plate 21B is protruded downward from the bottom of the floor pulling 12 by welding and rigidly joining.

  The upper ends of the two rods 22 </ b> A and 22 </ b> B constituting the rod pair 22 are rigidly joined to the connection bar 21. The rods 22 </ b> A and 22 </ b> B are made of a flat plate having substantially the same width as the connection bar 21, and are welded and rigidly joined to both end faces of the connection bar 21 in the longitudinal direction of the floor pulling 12. The lower ends of the rods 22 </ b> A and 22 </ b> B are pin-bonded to a portion of the floor slab 11 facing the beam 11 </ b> A by a concrete screw 23 and a washer 24. The upper and lower surface portions of the floor pulling 12 and the bottom plate 21 </ b> B of the connection bar 21 are preliminarily provided with screw fixing tool working holes 23 </ b> A for the concrete screws 23. At this time, the two rods 22 </ b> A and 22 </ b> B are bent obliquely between the joint portion to the connection bar 21 </ b> A and the joint portion by the concrete screw 23, and the lower end interval thereof is narrower than the upper end interval.

  Hereinafter, the support mechanism of the floor pulling 12 using the connection bar 21 and the rod pair 22 as the support means 20 will be described (FIG. 4). That is, the support means 20 is deformed by a minute geometric movement within the elastic range due to the reaction force generated at the joint portion between the floor slab 11 and the support means 20 due to the external force acting on the floor pulling 12. As a result, it is possible to generate a bending moment Mr that is in a direction opposite to the bending moment Mc generated at the joint between the floor pulling 12 and the support means 20. Details are as follows.

  (1) When the bending moment Mc acts on the floor pulling 12 from the floor 10, the horizontal force P acts on the connecting bar 21.

(2) An axial force A (A ₁ and A ₂ ) is generated in each rod 22A, 22B of the rod pair 22 by the horizontal force P acting on the connection bar 21.

(3) A bending moment Mr resulting from the axial forces A ₁ and A ₂ of the rods 22A and 22B of the rod pair 22 is generated in the connecting bar 21 and thus the floor pulling 12. The bending moment Mr is in the opposite direction to the bending moment Mc. The horizontal component of the axial force A (A ₁ and A ₂ ) generated in each rod 22A, 22B of the rod pair 22 is H (H ₁ and H ₂ ), the vertical component is V (V ₁ and V ₂ ), and each rod The horizontal component of the distance between the junction point of the connection bar 21 of 22A and 22B and the junction point of the floor slab 11 is a (a ₁ and a ₂ ), the vertical component is b (b ₁ and b ₂ ), and the connection bar 21 C (c ₁ and c ₂ ) is the length from the joint point with the floor pulling 12 to the joint point with each rod 22A, 22B, and the floor pulling 12 (with the axial force A (A ₁ and A ₂ )) When the length of the arm of the moment with respect to the rigid connection point with the connecting bar 21 is d (d ₁ and d ₂ ), the following equations (1) to (4) are established.

  From FIG. 4, the following formulas (5) to (8) are established.

  In addition, about the junction part of the support means 20, although the joining of the upper end of rod 22A, 22B and the connection bar 21 and the joining of the lower end of rod 22A, 22B and the floor slab 11 are preferable, pin joining is preferable. Then, since the amount of deformation is large, it can be considered that the joint with the floor slab 11 is a pin and the joint with the connection bar 21 is rigid. Moreover, it is good also as a joining like what is called a semi-rigid joining to which a certain amount of change was permitted. The upper ends of the two rods 22 </ b> A and 22 </ b> B constituting the rod pair 22 may be joined to the floor pulling 12.

According to the present embodiment, the following operational effects can be obtained.
(a) When a bending moment Mc acts on the floor pulling 12 from the floor 10, a horizontal force P acts on the support means 20, and a bending moment Mr in the opposite direction against the bending moment Mc is generated in the floor pulling 12. Accordingly, the bending moment Mc and the bending moment Mr cancel each other, and the bending deformation of the floor pulling 12 can be minimized. Thereby, the floor pulling 12 can have a certain bending resistance performance while reducing the cross section. Further, floor vibration due to walking on the floor or falling objects is suppressed, so that the sound insulation performance to the downstairs can be improved.

  (b) The support means 20 includes a connection bar 21 and a rod pair 22, and the connection bar 21 is joined to protrude from the floor pulling 12, and the rod pair 22 is a combination of at least two rods 22A and 22B. The upper ends of the rods 22A and 22B were joined to the connection bar 21, the lower ends of the rods 22A and 22B were joined to the floor slab 11, and the lower end intervals thereof were narrower than the upper end intervals. Therefore, when the bending moment Mc acts on the floor pulling 12 from the floor 10 and the axial force acts on the constituent rods of the rod pair 22, the floor pulling 12 is generated due to the axial force of the rods 22 </ b> A and 22 </ b> B. The bending moment Mr is in the opposite direction to the bending moment Mc.

  (c) By projecting the connection bar 21 from the floor pulling 12, it becomes a gate type, the action point of the connection bar 21 and the rods 22A, 22B can be lengthened, and the bending moment Mr can be effectively applied. The inside of the connection bar 21 can be secured as piping and wiring space.

  (d) When the floor 10 is provided on the floor slab 11, the floor 10 is stably supported by the beam 11 </ b> A included in the floor slab 11 through the floor pulling 12. Accordingly, since the force and vibration transmitted from the support means can be received by the beam having strength, it is not necessary to increase the thickness of the entire floor slab 11, and the impact shielding performance of the floor 10 can be improved reasonably.

  (e) Construction can be facilitated by pin-joining the lower ends of the two rods 22A and 22B constituting the rod pair 22 to the floor slab 11. In combination with the above-mentioned (a) to (d), equivalent performance can be obtained when the floor pulling 12 is rigidly joined to the floor slab 11 with simple construction.

Hereinafter, the specific effect (FIG. 8) which supports the floor pulling 12 by this invention is demonstrated in contrast with a comparative example (FIGS. 5-7). 5 to 8, it is assumed that a vertical load 1t acts on the center of the floor pulling 12.

(Comparative Example 1) (FIG. 5)
In FIG. 5, the floor pulling 12 is simply supported by the floor slab 11, where the horizontal reaction force = 0, the vertical reaction force = 0.5 t, and the maximum bending deflection δ = 0.7788 cm. Since no horizontal force is generated, joining to the floor slab 11 is easy.

(Comparative Example 2) (FIG. 6)
In FIG. 6, the floor pulling 12 is pin-supported on the floor slab 11, and the horizontal reaction force is 3.68 t, the vertical reaction force is 0.5 t, and the maximum bending deflection δ is 0.5465 cm. Since a large horizontal force is generated, a strong fixing fastener is required between the floor slab 11 and the slab 11.

(Comparative Example 3) (FIG. 7)
In FIG. 7, the floor pulling 12 is rigidly joined to the floor slab 11, where the horizontal reaction force is 0.669 t, the vertical reaction force is 3.005 to 3.505 t, and the maximum bending deflection δ is 0.4370 cm. A large vertical load is generated at each fulcrum, but the horizontal reaction force can be reduced. The floor pulling 12 needs to be in close contact with the floor slab 11 at a rigid joint point, which requires a large cost and construction period such as ensuring the horizontal accuracy of the groundwork.

(Invention Example) (FIG. 8)
FIG. 8 shows a support structure according to the present invention using the connecting bar 21 and the rod pair 22 as described above. Horizontal reaction force = 0.609 to 0.712 t (comparative with Comparative Example 3), vertical reaction force = 2.957 to 3.457 t (comparison) The average bending deflection δ = 0.4450 cm. With respect to the maximum bending deflection δ, 43% improvement from Comparative Example 1, 19% improvement from Comparative Example 2, and substantially the same effect as Comparative Example 3 were obtained. Since the floor pulling 12 is for connecting the rods 22A and 22B of the rod pair 22 to the floor slab 11, the bending deformation resistance can be improved while making the construction easy.

  The embodiment of the floor support structure according to the present invention for supporting the floor fork to the floor slab through the support means has been described in detail with reference to the drawings. However, the specific configuration of the present invention is limited to this embodiment. Instead, for example, when the floor slab is a floor structure 100 (having a large floor beam 101 and a small floor beam 102) as shown in FIG. 9, the large floor 12 is connected to the floor beam 102 or the like via the support means 20. A floor support structure supported by a beam may be used, and design changes and the like within a range not departing from the gist of the invention are included in the present invention.

FIG. 1 is a front view showing a floor support structure. FIG. 2 is an enlarged front view showing the main part of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a schematic diagram showing a bending moment acting on the floor pulling. FIG. 5 is a schematic view showing a simple support structure for the floor pulling. FIG. 6 is a schematic diagram showing a floor support pin support structure. FIG. 7 is a schematic diagram showing a floor jointed rigid joint support structure. FIG. 8 is a schematic diagram showing a support structure for floor pulling according to the present invention. FIG. 9 is a front view showing another example of the floor support structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Floor 11 Floor slab 11A Beam 12 Floor large drawing 20 Support means 21 Connection bar 22 Rod pair 22A, 22B Rod 23 Screw 100 Floor structure 102 Floor beam (beam)

Claims (4)

In the floor support structure that supports the floor pulling to the floor slab or beam via the support means,
The reaction force generated at the joint between the floor slab or beam and the support means due to the external force acting on the floor pulling causes the support means to be deformed by a minute geometric movement within the elastic range. A floor support structure characterized in that it can generate a bending moment Mr that is in a direction opposite to the bending moment Mc generated at the joint between the floor pulling and the support means.   The support means includes a rod pair composed of a combination of at least two rods, the rod pair joining the upper ends of the rods to the floor pull and joining the lower ends of the rods to a floor slab or beam. 2. The floor support structure according to claim 1, wherein the lower end interval is narrower than the upper end interval.   The support means includes a connection bar and a rod pair, the connection bar is joined in a state protruding from the floor pulling, and the rod pair is a combination of at least two rods, and the upper ends of the rods are connected to the connection bar. The floor support structure according to claim 1, wherein the lower ends of the rods are joined to a floor slab or a beam, and the lower end interval is made narrower than the upper end interval.   The floor support structure according to any one of claims 1 to 3, wherein a beam is arranged immediately below a floor slab on which the support means is installed.

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