JPH08421Y2 - Gymnasium floor structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a floor structure of a gymnasium, and more particularly, to a more uniform elasticity over the entire floor.

[Prior Art] The floor of a gymnasium is required to have elasticity and hardness evenness over the entire floor in order for a person to exercise vigorously or to bounce the ball.

For this reason, as the floor structure of a conventional gymnasium, a plurality of Daihiki steels are fixed in parallel on supporting legs arranged at appropriate intervals, and a plurality of thick steel bars with a width of about 35mm, about 300mm are placed on the Daihiki steel. In general, the pitch is set in a direction orthogonal to the Daihiki steel, and a face plate is attached on the joist steel.

The present applicant has applied for the floor structure disclosed in Japanese Utility Model Laid-Open No. 62-96427. As for the floor structure, joists are continuously formed into a trapezoidal shape or a rectangular wave shape, and the continuous joists are used to create a floor structure similar to the above.

[Problems to be Solved by the Invention] Although a certain degree of uniformity of elasticity is obtained in the conventional floor structure, considering the elasticity of a rectangular portion surrounded by adjacent Daihiki steel and adjacent joists on the floor surface, , Its central part (A)
There is a difference in elasticity between the intersection (B) between the Daihiki steel and the joist, the midpoint (C) on the joist, and the midpoint (D) of the Daihiki steel, and sufficient uniformity is obtained. It could not be said that it was planned.

Therefore, the present invention investigates the relationship between the width of joists and the arrangement pitch of each joist, and optimizes the relationship to further improve the uniformity of the elasticity of the floor structure. To aim.

[Means for Solving the Problems] The present invention is a floor in which a plurality of steel joists are mounted in parallel on a large-drawing steel on a support leg at appropriate intervals, and a surface plate is mounted on the steel joists. The structure achieves the above object. Therefore, the steel joists are formed into a trapezoidal cross section,
The width of the upper surface was formed to be about 1/3 to 1/2 of the arrangement pitch of steel joists.

Set the width of the steel joists to about 1/3 of the pitch of the steel joists.
The reason for this is that below that, there is a part where the elasticity of the floor surface becomes too weak, and the reason why it is reduced to less than 1/2 is that where the elasticity becomes too strong. Because there is.

[Operation] In the floor structure of the gymnasium described above, steel joists are formed one by one without being continuous, and the width of the steel joists is made considerably larger than that of the conventional example to increase the rigidity. Since the width of the upper surface is smaller than 1/2 of the pitch of the steel joists, the rigidity of the floor surface is not raised too much.

Therefore, the elasticity of the rectangular portion of the floor surface surrounded by the adjacent Daihiki steel and the adjacent joist becomes uniform throughout.

Embodiment An embodiment of the present invention will be described with reference to FIGS.

In the floor structure of the gymnasium, Daihiki steel 2 is fixed to the upper ends of supporting legs 1 arranged at appropriate intervals, and a plurality of Daihiki steels 2 are provided in parallel. Joist 3
Are attached in parallel at appropriate intervals, and the surface plate 4 is attached to the upper side of the steel joists 3. The height of the support leg 1 can be adjusted with an adjusting bolt 1a, and a cushion rubber 1b is provided at the upper end. Further, the surface plate 4 is composed of waste and flooring.

As shown in FIG. 1, the steel joist 3 has a substantially trapezoidal cross section with an opening at the bottom, and the width W of its upper surface is formed to be about 1/3 to 1/2 of the arrangement pitch P of the steel joists. ing.

Here, in order to know how the relationship between the upper surface width W of the steel joists and the arrangement pitch P of the steel joists affects the elasticity of the floor surface, the buffer effect value U at several points on the floor surface , Hardness and deformation energy U _F (Kg · cm) were measured, and the results are shown in Table 1. Note _{U = U F -1.1D R × D} R ·
T _R ^-1 . The hardness is the maximum value of the acceleration when the test piece is allowed to fall freely from a predetermined height and collides with the floor.

Where U _F is the floor deformation energy (N · cm) {kgf · cm} until the floor deformation reaches its maximum, D _R is the maximum amplitude of floor vibration (cm), and T _R is the floor vibration It is an apparent half cycle at the maximum amplitude of vibration.

Further, as shown in FIG. 3, the measurement point is a rectangular portion surrounded by the adjacent Daihiki steel 2 and the adjacent steel joist 3 and its center portion A, and the intersection B of the Daihiki steel and the steel joist. And a midpoint C on the steel joist 3 and a midpoint D on the Daihiki steel 2.
Also, the relationship between the upper surface width W of the steel joists 3 and the arrangement pitch P is W / P
Was measured for 1/3 and 1/2, 1/9 (the above-mentioned conventional example with joists alone), and 3/4 (the above-mentioned conventional example with joists connected) .

As can be seen from Table 1, each characteristic data is W /
It can be seen that when P is 1/3 and 1/2, the difference between the measurement positions A to D is smaller than 1/9 and 3/4 of the conventional example, and the elasticity is uniform. . Since the hardness at the C and D positions was higher than the hardness at the A position and lower than the hardness at the B position, the measured values were not described.

[Advantage of the Invention] The floor structure of the present invention is formed wider than the conventional steel joists, so that the contact surface between the surface plate and the steel joists is widened, and the steel joists and the Daihiki steel are The elasticity of each part of the enclosed rectangular part, the central part of the periphery, and the corners becomes more uniform, which is desirable as the floor of the gymnasium.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a floor structure of a gymnasium of the present invention, FIG. 2 is a partial plan view of the same floor structure, and FIG. 3 is an explanatory view showing a position for measuring the elasticity of the floor surface. 1; Support legs, 2; Daihiki steel 3; Steel joists, 4; Face plate

Claims (1)

[Scope of utility model registration request] 1. A plurality of Daihiki steels are held in parallel on supporting legs arranged at appropriate intervals, and a plurality of steel joists are fixed in parallel on each of the Daihiki steels at appropriate intervals in a direction orthogonal to them. Then, in the floor structure in which the surface plate is attached on the steel joists, the cross section of the steel joists is formed into a substantially trapezoidal shape of the lower opening,
The floor structure of the gymnasium is characterized in that its upper surface width is formed to be about 1/3 to 1/2 of the pitch of the steel joists.