Opening structure in floor slab

Abstract

To develop a method for improving the strength against the stress applied to a corner of a polygonal opening in a floor slab of a building.SOLUTION: There is provided an opening 3 provided in a floor slab 1 of a building having a plurality of floors and when the opening 3 has a polygonal shape, the corners of the polygonal shape of the opening are made in a rounded shape 5. This is also suitable for use when the opening 3 in the floor slab 1 is an opening for passing a pipe for passing a fluid. Furthermore, it is preferable to provide a partition extending upward along the opening periphery of the opening 3 in the floor slab 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure of an opening in a floor slab of a building, and more particularly to a shape of an opening in a floor slab that can be suitably applied to a building having production facilities such as a factory. [Background technology]

[0002] In buildings such as factories with multiple floors, it is necessary to secure routes for supplying water and raw materials through upper and lower floors. For this reason, it is sometimes necessary to form openings in the floor slabs of the building. That is, an opening may be provided in the floor slab, and various pipes may be passed through the opening to pass fluids such as water, steam, and various raw material supplies. In addition, the opening in the floor slab is often a polygonal opening such as a rectangle. On the other hand, there are cases where an external force such as an impact acts irregularly on the opening. In response to this, stress acts on the floor slab near the opening, but if the opening is polygonal, there is a problem in that excessive stress acts on the corners. On the other hand, as a related technique for dealing with such a problem, a prior art has been disclosed that relates to a method for reinforcing an opening in the floor slab. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] The prior art is a method for increasing the strength of the opening. On the other hand, other means for countering the stress acting on the opening are also envisioned. Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors therefore conducted extensive research into this issue and investigated methods for improving the strength against stress applied to the corners of polygonal openings in floor slabs of buildings. [Means for solving the problem]

[0005] As a result of intensive research by the inventors, they have discovered that when an opening in a floor slab has a polygonal shape, by making the corners of the opening rounded, it is possible to prevent stress from being concentrated at the corners, making it less likely for cracks to occur. That is, the first invention of the present application is "An opening provided in a floor slab of a building having multiple floors, the opening having a polygonal shape, and the corners of the polygonal shape of the opening having a rounded shape."

[0006] Next, the opening in the floor slab is preferably an opening through which piping passes for supplying water or steam, or for supplying a fluid such as a liquid or powder through the opening. That is, the second invention of the present application is "The floor slab opening structure according to claim 1, wherein the opening in the floor slab is an opening for passing piping to pass a fluid through."

[0007] Next, in a factory or the like, it is preferable to provide a partition extending upward along the periphery of the opening of the floor slab. That is, the third invention of the present application is "The floor slab opening structure according to claim 1 or 2 further comprises a partition extending upward along the opening periphery of the floor slab opening."

[0008] Next, the opening in the floor slab of the present invention is preferably provided on the second or higher floor of a factory building. That is, the fourth invention of the present application is "The floor slab opening structure according to any one of claims 1 to 3, wherein the floor slab opening is provided in a floor slab on the second or higher floor of a building." Effect of the Invention

[0009] By utilizing the floor slab opening structure of the present invention, cracks at the corners can be reduced when the floor slab opening has a polygonal shape such as a rectangle. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a state when an external force is applied to an opening in a floor slab. [Diagram 2] FIG. 1 is a perspective view of a first embodiment of a floor slab opening of the present invention. [Diagram 3] FIG. 1 is a cross-sectional view showing an example of the layout of openings in a floor slab and piping in a factory. [Figure 4] 1 is a schematic diagram showing a case in which multiple pipes pass through an opening in a floor slab of the present invention. [Diagram 5] This is a schematic diagram of the state when external force is applied from a pipe to an opening in a floor slab. [Figure 6] FIG. 2 is a perspective view of a second embodiment of the floor slab opening of the present invention. [Figure 7] 3 is a perspective view of the floor slab of the present invention shown in FIG. 2 in which a partition is provided along the periphery of the opening. FIG. [Figure 8] 13 is a perspective view showing an example of a water path when a partition is provided along the opening periphery of the opening in the slab. FIG. [Explanation of symbols]

[0011] 1 Floor slab 3 Opening 5 Rounded corners 7 Piping 9. Production Facilities 11 Partition DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to these embodiments. The present invention will be described in detail below. The floor slab 1 in the present invention refers to a plate-like structure that supports weight perpendicular to the surface of a floor structure in a building. In the case of large-scale buildings such as factories, the floor slab 1 is often made of concrete or reinforced concrete.

[0013] The opening 3 in the floor slab 1 refers to a large hole provided in the floor slab 1 that leads to the lower part of the floor slab 1. By providing the opening 3, various pipes 7 can be passed through to pass fluids such as water, steam, and various raw material supplies to the upper and lower floors. On the other hand, the opening 3 in the floor slab 1 is often a polygonal opening 3 such as a rectangle. In this case, when a tensile external force is applied to the corner of the opening 3, the stress at one point of the polygonal corner cannot be resisted, and a crack may occur as shown in Figure 1(A).

[0014] On the other hand, in the present invention, the corners are rounded as shown in Fig. 1(B). Since the corners 5 are rounded in this way, stress is dispersed, and the occurrence of cracks due to external forces can be prevented more effectively than in the case of Fig. 1(A). This is a feature of the present invention. 2 is a perspective view of an opening in a floor slab 1 according to a first embodiment of the opening of the present invention. The first embodiment of the present invention discloses a rectangular opening 3 provided in the floor slab 1 on the second floor of a building.

[0015] The corners of the rectangular opening 3 are rounded. In construction, when the opening 3 is provided, for example in the case of reinforced concrete, a framework of reinforcing bars is formed, and then the concrete is poured into a steel or wooden formwork, but it is desirable to make the framework of reinforcing bars into a special framework in advance for the periphery of the opening 3 in the present invention. For example, a reinforcing method such as that disclosed in Japanese Patent Application Laid-Open No. 4-189954 can be mentioned.

[0016] Next, by making the formwork into which the concrete is poured rounded in relation to the corners of the opening, it is possible to make the corners of the opening rounded. Alternatively, it is possible to provide an opening by drilling or cutting holes in the concrete of the floor slab once it has been formed. Then, the corners can be cut into a rounded shape to form the rounded corners 5.

[0017] In addition, the term "R-shape" as used herein means that the corner is curved. The radius of curvature of the curve can be of various sizes. The radius of curvature does not need to be constant, and may be variable. Next, the opening 3 of the present invention can be suitably used in cases where various pipes 7 are passed through the opening 3 to pass fluids such as water, steam, various raw material supplies, etc. That is, in a factory or the like, for example, production equipment 9 may be placed on the second floor, and water, steam, raw materials, etc. may be introduced from the first floor, as shown in Fig. 3. In such a case, the necessary materials can be supplied through the piping section 7 passing through the opening 3 of the floor slab 1 of the present invention.

[0018] When the opening 3 of the floor slab 1 of the present invention is used for passing a pipe 7, for example, a plurality of pipes 7 can be passed through as shown in FIG. Furthermore, when supplying fluids such as water, steam, and raw materials, the piping 7 may vibrate. As shown in Figure 5(A), when the piping 7 comes into contact with the opening 3 in the floor slab 1 and vibrations are transmitted, if the corner is not rounded but has a normal corner, the stress caused by the vibration may cause the corner to crack. On the other hand, as shown in Figure 5(B), if the corner is rounded 5, the stress is dispersed and the possibility of cracks occurring is reduced.

[0019] FIG. 5 shows a case where the vibration of the pipe 7 is transmitted directly, but the same applies in other cases, for example, when the pipe is wrapped in insulation or when other materials are interposed between the pipe 7 and the opening 3 of the floor slab 1. For the above purpose, it is preferable that the radius of the cross section of the pipe 7 passing through the opening 3 of the floor slab 1 of the present invention is close to the radius of curvature of the arc shape of the opening 3 of the floor slab 1. Specifically, the value of (radius of the cross section of the pipe 7) / (radius of curvature of the arc shape of the floor slab opening 3) is preferably in the range of 0.7 to 1.3. Also, the range of 0.8 to 1.2 is more preferable. The range of 0.9 to 1.1 is most preferable.

[0020] In this way, with regard to the structure of the opening 3 in the floor slab 1 and the piping 7 passing through said opening 3, it is preferable that the ratio of the curved shape of the opening 3 in the floor slab to the cross-sectional radius of the piping 7 passing through said opening be within a specific range.

[0021] Next, Fig. 6 shows another embodiment of the polygonal opening 3 in the present invention. The polygonal opening 3 in the present invention includes not only rectangular and square shapes but also various shapes such as an L-shape and a trapezoid. Next, in the present invention, it is also preferable to further provide a partition 11 extending upward along the periphery of the opening 3 of the floor slab 1 as shown in Fig. 7. That is, Fig. 7 shows the case of Fig. 2, in which a partition 11 is further provided extending upward along the opening periphery of the opening 3 along the opening end.

[0022] In factories, production equipment 9 installed on the floor slab 1 on the second floor is often cleaned, and in this case, water may be poured onto the floor, but a partition 11 is provided to prevent water from falling onto the floor below through an opening 3 provided in the floor slab 1. As shown in Fig. 7, in the second embodiment of the present invention, a partition 11 is provided that extends upward along the periphery of the opening 3, and when water is poured due to the presence of the partition 11, if there is a normal corner, water may remain at the corner.

[0023] On the other hand, in the present invention, as shown in the embodiment shown in Fig. 7, the corners are rounded 5, which has the advantage that the flow of water becomes smoother, the water drains well, and this leads only to improved cleaning (Fig. 8). In other words, if the corners are sharp, water is likely to remain near the corners when the floor slab is washed with water, but if the corners are rounded, less water remains, making them preferable.

Claims

1. A floor slab opening structure comprising an opening provided in a floor slab of a multi-story building, the opening having a polygonal shape, the corners of the polygonal shape of the opening being rounded.

2. 2. The floor slab opening structure according to claim 1, wherein the opening in the floor slab is an opening for passing a pipe for passing a fluid therethrough.

3. 3. The floor slab opening structure according to claim 1, further comprising a partition extending upward along an opening periphery of the floor slab opening.

4. The floor slab opening structure according to any one of claims 1 to 3, wherein the floor slab opening is provided in a floor slab of a second or higher floor of a building.

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