JPH0542542B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a floor structure.

[Prior art] As a conventional floor structure, for example,
There are those described in Publication No. 37462 and those shown in FIGS. 5 and 6. This floor structure 10 relates to a floor part in a building unit, and the floor structure 10 is
The ends of the small beams 12 arranged in the Y direction are joined to the large beams 11 arranged in the Y direction. The girder 11 is made of channel steel and has flange portions 14 on the upper and lower sides of a vertically arranged web portion 13, respectively. On the other hand, small beam 1
2 is made of square pipe material, and a connecting piece 15 is attached to the end. Like the girder 11, the connecting piece 15 is also made of channel steel, and has flange portions 17 on the upper and lower sides of the web portion 16, respectively.

The ends of the small beams 12 are connected to the main beam 11 by hugging the upper and lower flange portions 14 of the large beam 11 and the upper and lower flange portions 17 of the connecting piece 15, and connecting the corresponding flange portions 14 and 17 to each other. They are welded together. As a result, the main beam 11
The joint portion between the connecting piece 15 and the connecting piece 15 forms a frame body composed of respective web portions and respective flange portions.

When the ends of the small beams 12 are joined to the large beams 11, a plurality of joists 18 are disposed on the top of the small beams 12. Each joist 18 is arranged in a direction crossing the small beam 12, that is, in the X direction, and each
It will be joined to 2. The joists 18 are joined to the small beams 12 by driving nails 19. Joist material 1 joined to small beam 12
A floor material 19A is further attached to the upper part of 8,
As a result, the floor portion of the building unit, ie, the floor structure 10, is formed.

However, in the conventional floor structure 10 described above, when an excessive load or impact is applied to the floor surface in the direction of arrow A, the large beam 11 bends or twists, and the small beam 12 bends or twists inside the large beam 11. Vibration in the direction of arrow B may occur around the vertical axis Q, or
It was assumed that the deflection indicated by the dotted chain line would occur. Such vibrations and deflections are considered to be the cause of excessive floor vibrations and floor noise, leading to a decrease in the feeling of walking and a decrease in the feeling of living in a building unit. In addition, deformation is likely to occur at the bent portion of the corner of the frame at the joint between the girder 11 and the connecting piece 15, such as the bent portion between the web portion 13 and the flange portion 14 of the girder 11, and the strength of the floor structure is reduced. There was a problem with rigidity.

Therefore, the ends of the small beams were joined to the vertically arranged web parts of the main beams, so that excessive loads and impacts on the floor could be effectively transmitted to the web parts of the main beams. As a result, deformation at the joint between the bending part and the connecting piece between the web part and flange part of the girder could be prevented, and the strength and rigidity of the floor structure could be improved.
However, as a result of the excessive load and impact on the floor being transmitted to the web portion of the girder, although the torsional deformation around the neutral axis Q was small, the vibration of the web portion of the girder around the neutral axis Q became significant.

In the past, Japanese Patent Laid-Open No. 51-145128 discloses a method in which a damping material is applied to a building structural material, and a vibration insulating material is clamped to the damping material in contact with the material, and the steel material to be cut is cut with a saw blade. It is described that the vibrations applied to the structural material during this process are absorbed by vibration damping materials and vibration insulating materials. However, such structures require clamps and the damping material and vibration insulating material are clamped together with the structural material, so the damping material and vibration insulating material may vibrate following the vibrations applied to the structure. However, it was believed that the vibration absorption efficiency was correspondingly low.

[Problems to be Solved by the Invention] An object of the present invention is to improve the strength and steel properties of a floor structure as a structure, and to improve its vibration performance.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a floor that is formed by joining the ends of small beams to a large beam formed of a steel material having a flange portion and a web portion. The structure is such that the end of the small beam is joined to the web part of the main beam, the web part is arranged vertically, and one side of the viscoelastic plate is adhered to the surface of the web part, and the main beam and the main beam are bonded to the other side of the viscoelastic plate. An independent vibration restraint plate is attached.

[Function] According to the present invention, since the ends of the small beams are joined to the web portions of the main beams, excessive loads and impacts on the floor are absorbed by the bends between the web portions and the flange portions of the main beams. is effectively transmitted to the girder without contributing to the deformation of the beam. In addition, since the viscoelastic plate on which the vibration restraint plate is attached is adhered to the vertically arranged web part of the girder, when the girder vibrates, the viscoelastic plate
When sandwiched between a vibrating girder and an independent vibration restraint plate, large compression or shear deformation occurs, and vibrations on the girder side can be effectively absorbed. Therefore, excessive load or impact energy applied to the floor surface is efficiently converted into thermal energy of the viscoelastic plate.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 shows a floor structure according to an embodiment of the present invention, and Fig. 4 is a sectional view taken along the - line in Fig. 4, and Fig. 2 shows a state in which a viscoelastic plate and a vibration restraint plate are attached to the web portion of a girder. FIG. 3 is a perspective view showing the process of forming the floor structure, and FIG. 4 is a perspective view showing the structure of a building unit using the floor structure.

The floor structure 20 shown in FIG. 1 corresponds to the floor portion of the building unit 21 shown in FIG. This building unit 21 constitutes a part of a unit house, for example, and is formed by joining and combining a plurality of structural members.

The building unit 21 has steel columns 22 erected at each of its four corners. Each pillar 22 to be erected
Between the lower end sides of each support column 22 in the X direction, a steel girder floor girder 23 is installed.
A steel gable girder 24 is disposed between the lower end sides of each support column 22 in the direction. Each girder floor girder 23 and gable floor girder 24 have their respective ends attached to each support column 2.
It is connected to the lower end side part of 2. on the other hand,
Among the pillars 22 to be erected, between the upper end sides of each pillar 22 in the X direction, a steel girder ceiling girder 2
5 is disposed, and a steel gable girder 26 is disposed between the upper end sides of each support column 22 in the Y direction. Each girder ceiling beam 25 and gable ceiling beam 26
Also, each end portion is connected to the upper end side portion of each support column 22.

As shown in FIG. 1, the girder floor girder 23 is formed of a channel steel material with flange portions 28 above and below a web portion 27. One side of a viscoelastic plate 29 made of a material such as butyl rubber is adhered to the outer surface of the web portion 27 of the girder floor girder 23, and the other side of the viscoelastic plate 29 is bonded as shown in FIG. A vibration restraint plate 30 independent of the girder floor girder 27 is attached.

A plurality of floor beams 31 are disposed between the pair of opposing girder floor girders 23, and the floor beams 31 are arranged at predetermined intervals in the X direction. Each end of each of the installed floor beams 31 is joined to the respective girder floor girders 23. Floor beam 31
As shown in FIGS. 1 and 3, it is made of H-shaped steel and has flange portions 33 on the upper and lower sides of the web portion 32, respectively. Floor beam 31
The end of the girder is connected to the girder 23 via the connecting fitting 34. First, the connecting fitting 34 and the web portion 32 of the floor girder 31 are connected using bolts 35 as shown in FIG. I have to. Next, the connecting fitting 34 joined to the end of the floor beam 31 and the web portion 27 of the girder floor girder 23 are connected by bolts 36 and nuts 37. For this purpose, the web portion 27 of the girder floor girder 23 and the viscoelastic plate 29 bonded to the web portion 27 are pre-drilled with insertion holes 38 for the joining bolts 36, as shown in FIG. Further, a hole 39 is pre-drilled in the vibration restraint plate 30 to be mounted, and the hole 39 has a diameter such that the head of the bolt 36 inserted into the insertion hole 38 does not interfere with the vibration restraint plate 30. Ru. As a result, the vibration restraint plate 30 becomes structurally independent from the girder floor girder 23 and the floor beam 31. Therefore, even if the joined girder floor girder 23 and floor girder 31 are vibrated in the direction of arrow B in FIG. It will be attached to the elastic plate 29.

In this way, when the girder floor girder 23 and the floor girder 31 are joined, the joist material 40 is placed on the upper part of the floor girder 31.
Multiple pieces are installed. Each of the joists 40 is arranged at predetermined intervals in the Y direction, and each end is supported by each gable girder 24 facing each other. Each joist 40 is joined to the floor beam 31 at the intersection with the floor beam 31. The joining is performed by driving nails 41 into the floor beams 31 and the joists 40.
Further, on the upper surface of the joist material 40 to be arranged, a floor material 4 is placed.
2 is adhered, thereby forming the floor structure 20 of the building unit 21. In addition, the fourth
In the figure, 43 indicates a ceiling beam.

Next, the operation of the above embodiment will be explained.

According to the floor structure 20 according to the above embodiment, the end portion of the floor beam 31 is connected to the web portion 27 of the girder floor girder 23, which has less torsional deformation around the neutral axis Q than the flange portion 28, using the connecting fitting 34. They will be joined via. As a result, even when vibrations or shocks are applied to the floor surface of the building unit 21 in the direction of arrow A, the vibrations or shocks are transferred to the web portions of the girder floor girders 23.
The deflection of the floor beam 31 due to the torsional deformation of the joint is transmitted to the girder floor girder 23 without contributing to the deformation at the bending portion between the flange portion 7 and the flange portion 28,
This eliminates the problem of vibration amplification.

Further, a vibration restraint plate 30 is attached to the outer surface of the web 27 of the girder floor girder 23 with a viscoelastic plate 29 interposed therebetween. Therefore, even when the girder floor girder 23 vibrates due to shock or vibration applied to the floor surface, the viscoelastic plate 29 is sandwiched between the vibrating girder floor girder 23 and the independent vibration restraining plate 30. Under such conditions, large compression or shear deformation occurs, making it possible to effectively absorb vibrations on the girder floor girder 23 and floor girder 31 sides.

This makes it possible to improve the strength and rigidity of the floor structure 20 as a structure, and to improve its vibration damping performance.

[Effects of the Invention] As described above, the present invention provides a floor structure formed by joining the ends of a small beam to a large beam formed of a steel material having a flange portion and a web portion. The end of the is joined to the web part of the girder, and the web part is arranged vertically, and one side of the viscoelastic plate is adhered to the surface of the web part, and a vibration restraint plate independent from the girder is further attached to the other side of the viscoelastic plate. As a result, it is possible to improve the strength and rigidity of the floor structure as a structure, and also to improve its vibration damping performance.

[Brief explanation of drawings]

Fig. 1 shows a floor structure according to an embodiment of the present invention, and Fig. 4 is a sectional view taken along the - line in Fig. 4, and Fig. 2 shows a state in which a viscoelastic plate and a vibration restraint plate are attached to the web portion of a girder. FIG. 3 is a perspective view showing the process of forming a floor structure, FIG. 4 is a perspective view showing the structure of a building unit using the floor structure, and FIG. 5 is a perspective view of a conventional floor structure. FIG. 6 is a perspective view showing the main parts, and FIG. 6 is a sectional view thereof. 20...Floor structure, 23...Girder floor girder, 27...
...flange part, 28 ... web part, 29 ... viscoelastic plate, 30 ... vibration restraint plate, 31 ... floor beam.

Claims (1)

[Claims] 1 A floor structure formed by joining the ends of a small beam to a large beam formed of steel material having a flange part and a web part, where the ends of the small beam are joined to the web part of the main beam, and the ends of the small beam are joined to the web part of the main beam. 1. A floor structure characterized in that the web part is arranged vertically, one side of a viscoelastic plate is adhered to the surface of the web part, and a vibration restraining plate independent of the girder is attached to the other side of the viscoelastic plate.