Structural slits

Abstract

To provide a structural slit with a radiation shield function.SOLUTION: A structural slit 100 that comprises: a slit 18 at an end of a wall 16; and a tabular radiation shielding material 30 which is movably provided in the slit 18 and exhibits a radiation shielding function. The radiation shield material 30 is configured so that an arrangement angle inside the slit 18 changes in accordance with change in a width W of the slit 18.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structural slit provided on a wall of a building or the like.

Background Art

[0002] Conventionally, in order to prevent stress concentration in members by providing seismic walls, structural slits may be provided (see, for example, Patent Document 1). A room for performing treatment using strong radiation (such as a linac room) needs to be surrounded by thick concrete walls (such as a wall with a thickness t = 1400 mm, etc.) on all four sides for radiation shielding, but stress concentration will naturally occur in this wall as well.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to relieve the above stress concentration, measures such as providing a seismic wall on the outer periphery of the same floor as the linac room, increasing the strength of the members around the linac room, or cutting the edge between the linac room and the surrounding structure may be taken. However, there is a problem that the construction time becomes longer compared to the pure S structure.

[0005] If a structural slit can be provided in the wall of the linac room, the problem of stress concentration will be solved. However, conventional slit materials are made of polyethylene or the like, and it is difficult to adopt them because of their low radiation shielding ability. For this reason, a structural slit having a radiation shielding function has been demanded.

[0006] The present invention has been made in view of the above, and an object thereof is to provide a structural slit having a radiation shielding function. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the structural slit according to the present invention is a structural slit consisting of a slit provided at the end of a wall, comprising a plate-shaped radiation shielding material that is movable inside the slit and exhibits a radiation shielding function, wherein the radiation shielding material is configured such that its arrangement angle inside the slit changes in accordance with the change in the width of the slit.

[0008] Furthermore, another structural slit according to the present invention is characterized in that, in the above-described invention, it has a shaft portion that rotatably fixes the radiation shielding material to the inside of the slit, and a torsion spring that biases the radiation shielding material in a direction that closes the slit.

[0009] Furthermore, another structural slit according to the present invention is characterized in that, in the above-described invention, the slit is a vertical slit extending in the vertical direction.

[0010] Furthermore, another structural slit according to the present invention is a structural slit consisting of a horizontal slit provided in the upper or lower part of a wall, comprising a plate-shaped radiation shielding material that is movable inside the horizontal slit and exhibits a radiation shielding function, wherein the radiation shielding material is composed of a plurality of iron plates stacked and arranged to slide relative to each other inside the horizontal slit. [Effects of the Invention]

[0011] The structural slit according to the present invention is a structural slit provided at the end of a wall, comprising a plate-shaped radiation shielding material that is movable inside the slit and exhibits a radiation shielding function, wherein the radiation shielding material is configured such that its arrangement angle inside the slit changes in accordance with the change in the width of the slit, thus providing a structural slit with a radiation shielding function.

[0012] Furthermore, according to another structural slit of the present invention, since it has a shaft portion that rotatably fixes the radiation shielding material inside the slit and a torsion spring that biases the radiation shielding material in a direction that closes the slit, it has the effect of being able to exert its radiation shielding function even when the radiation shielding material rotates around the shaft portion in accordance with the change in the width of the slit.

[0013] Furthermore, according to another structural slit of the present invention, since the slit is a vertical slit extending in the vertical direction, it has the effect of providing a vertical slit with radiation shielding function.

[0014] Furthermore, according to another structural slit of the present invention, a structural slit consisting of a horizontal slit provided in the upper or lower part of a wall is provided, which includes a plate-shaped radiation shielding material that is movable inside the horizontal slit and exhibits a radiation shielding function, and the radiation shielding material is composed of a plurality of iron plates stacked and arranged to slide relative to each other inside the horizontal slit, thereby providing a horizontal structural slit with a radiation shielding function. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a front view showing an embodiment of the structural slit according to the present invention. [Figure 2] Figure 2 is a perspective view of the main part of section A in Figure 1. [Figure 3] Figure 3 is a plan view of section A in Figure 1, where (1) is under normal conditions and (2) is during an earthquake. [Figure 4] Figure 4(1) is a cross-sectional view of section B in Figure 1, and (2) is a cross-sectional perspective view. [Modes for carrying out the invention]

[0016] The following describes in detail an embodiment of the structural slit according to the present invention with reference to the drawings. However, this embodiment does not limit the present invention.

[0017] As shown in Figure 1, a wall 16 of a radiation utilization facility (e.g., a linac room) is provided in the area surrounded by the column 10 and the upper and lower beams 12 and 14. The column 10, upper beam 12, lower beam 14, and wall 16 are all made of reinforced concrete. The wall 16 is an earthquake-resistant wall in which only the upper edge is directly fixed to the upper beam 12, and the sides and bottom edge of the wall 16 are structurally insulated from the column 10 and lower beam 14 by providing slits 18 and 20, respectively. A structural slit 100 consisting of a vertically extending vertical slit 18 is provided between the wall 16 and the column 10, and a structural slit 200 consisting of a horizontally extending horizontal slit 20 is provided between the wall 16 and the lower beam 14. The structural slit 100 between the wall 16 and the column 10 corresponds to the structural slit according to the embodiment of the present invention.

[0018] As shown in Figures 2 and 3(1), the structural slit 100 is provided movably inside the vertical slit 18 and comprises multiple rectangular steel plates 22 (radiation shielding material) that provide radiation shielding functionality. The steel plates 22 consist of a steel plate 24 provided along the side end surface 10A of the column 10, a steel plate 26 provided along the side end surface 16A of the wall 16, a steel plate 28 provided along the front and rear opening surfaces 18A of the vertical slit 18, and a steel plate 30 provided inside the area surrounded by these plates.

[0019] The iron plate 30 is configured such that the arrangement angle θ inside the vertical slit 18 changes in accordance with the change in the width W of the vertical slit 18. Specifically, the iron plate 30 is arranged with its longitudinal direction in the vertical direction, and is arranged such that the short-side direction of the iron plate 30 is inclined with respect to the wall thickness direction D when viewed from above. The dimensions of the iron plate 30 are of a size capable of exhibiting a radiation shielding function in the vertical slit 18, and it is preferable that the length in the longitudinal direction is approximately the same as the height in the vertical direction of the vertical slit 18, and the length in the short-side direction is longer than the width W of the vertical slit 18. A plurality of iron plates 30 (four in the example of the figure) are arranged in parallel at intervals in the wall thickness direction D. The more the number of iron plates 30, the more the radiation shielding performance can be improved.

[0020] On the side edge side of one side of the iron plate 30, a steel bar 32 (shaft portion) extending in the vertical direction is welded. The upper end of this steel bar 32 is rotatably inserted into the recess on the lower surface of the upper beam 12, and the lower end of the steel bar 32 is rotatably inserted into the recess provided in the iron plate 36 of the horizontal slit 20. Therefore, the iron plate 30 is fixedly arranged to be rotatable around the steel bar 32 inside the vertical slit 18. Note that the recesses into which the upper and lower ends of the steel bar 32 are inserted are preferably formed in a long groove shape extending in the wall thickness direction D. In this way, the steel bar 32 is movable in the wall thickness direction D. Also, on the other side of the iron plate 30, a plurality of torsion springs 34 (three in the example of FIG. 2) are arranged at intervals in the vertical direction on the side edge side corresponding to the position of the steel bar 32. The torsion springs 34 have the effect of biasing the iron plate 30 in a direction to close the opening surface 18A of the vertical slit 18. Note that the present invention is not limited to torsion springs, and other biasing means may be used. By doing so, even when the iron plate 30 rotates around the steel bar 32 in accordance with the change in the width W of the vertical slit 18, the radiation shielding function can be exhibited.

[0021] In the present embodiment, four iron plates 30A arranged closer to the column 10 and four iron plates 30B arranged closer to the wall 16 are alternately arranged in the wall thickness direction D. In the iron plate 30A where the steel bar 32 is arranged closer to the column 10, one end of the torsion spring 34 is fixed to the iron plate 30A, and the other end abuts on the iron plate 24 on the column 10 side. In the iron plate 30B where the steel bar 32 is arranged closer to the wall 16, one end of the torsion spring 34 is fixed to the iron plate 30B, and the other end abuts on the iron plate 26 on the wall 16 side.

[0022] The iron plate 28 provided on the opening surfaces 18A before and after the vertical slit 18 is arranged in a manner that connects the column surface and the wall surface to be substantially flush. This iron plate 28 is arranged so as to straddle the notch portions 10B formed at the corner portions of the columns 10 on the left and right of the vertical slit 18 and the notch portions 16B formed at the corner portions of the wall 16, and is configured to be slidable in the left - right direction (horizontal direction) between them according to the change in the width W of the vertical slit 18.

[0023] As shown in FIG. 4, the structural slit 200 is composed of a plurality of (two or more) rectangular iron plates 36 laminated in the vertical direction inside the horizontal slit 20, and fixing members 38 that fix these iron plates 36 to be swingable with respect to the lower surface of the wall 16 and the upper surface of the lower beam 14. The fixing members 38 are composed of a cylindrical foamed resin material 38A and anchor bars 38B, and a plurality of them are arranged at intervals in the longitudinal and lateral directions of the lower beam 14. The foamed resin material 38A is embedded in the recess 16C provided on the lower surface of the wall 16. The anchor bars 38B penetrate through the holes 36A provided in the iron plates 36 to connect the foamed resin material 38A and the lower beam 14 vertically. According to this configuration, the plurality of iron plates 36 laminated in the horizontal slit 20 are slidable with respect to each other. By sliding this iron plate 36 between the lower surface of the wall 16 and the upper surface of the lower beam 14, it can function as a horizontal slit.

[0024] The operation and function of the above configuration will be described. As shown in Figure 3(2), when the columns 10 and walls 16 deform due to inter-story deformation during an earthquake, the width W of the vertical slit 18 changes. As a result of this change, the steel plate 24 on the column 10 side and the steel plate 26 on the wall 16 side move closer together, as shown in Figure 3(2) from (b) to (a), and the internal steel plate 30 rotates around the steel rod 32 via the torsion spring 34. This changes the arrangement angle θ of the steel plates 30 inside the vertical slit 18. Note that even if a gap occurs between the steel plates 30, a gap of about 1 mm will not affect the radiation shielding capacity. In the example of Figure 3(2)(a), the steel rod 32 and torsion spring 34 are omitted from the illustration for explanatory purposes.

[0025] According to this embodiment, by using steel plates as the material for the structural slits, radiation shielding capability can be ensured while separating the wall 16 from the column beams. Furthermore, by laying rotatable steel plates 30 between the column 10 and the wall 16, the structure can follow inter-story deformation. In this way, it can function as a vertical slit with radiation shielding capabilities.

[0026] Furthermore, design rationalization becomes possible through stress concentration mitigation. By eliminating the conventional perimeter seismic walls used as a stress concentration countermeasure and changing the reinforced concrete (RC) columns and beams to steel (S) structures, construction time can be shortened.

[0027] Furthermore, in the above embodiment, the case in which only the upper edge of the wall 16 is directly fixed to the upper beam 12, thereby providing a horizontal slit 20 between the wall 16 and the lower beam 14, was described as an example. However, the present invention is not limited to this, and may also be applied to a configuration in which only the lower edge of the wall 16 is directly fixed to the lower beam 14, thereby providing a horizontal slit between the wall 16 and the upper beam 12. The same effects as described above can be achieved even in this configuration.

[0028] As described above, the structural slit according to the present invention is a structural slit consisting of a slit provided at the end of a wall, comprising a plate-shaped radiation shielding material that is movable inside the slit and exhibits a radiation shielding function, wherein the radiation shielding material is configured such that its arrangement angle inside the slit changes in accordance with the change in the width of the slit, thus providing a structural slit with a radiation shielding function.

[0029] Furthermore, according to another structural slit of the present invention, since it has a shaft portion that rotatably fixes the radiation shielding material inside the slit and a torsion spring that biases the radiation shielding material in a direction that closes the slit, the radiation shielding function can be maintained even when the radiation shielding material rotates around the shaft portion in accordance with a change in the width of the slit.

[0030] Furthermore, according to another structural slit of the present invention, since the slit is a vertical slit extending in the vertical direction, it is possible to provide a vertical slit equipped with a radiation shielding function.

[0031] Furthermore, according to another structural slit of the present invention, a structural slit consisting of a horizontal slit provided in the upper or lower part of a wall is provided, which includes a plate-shaped radiation shielding material that is movable inside the horizontal slit and exhibits a radiation shielding function, wherein the radiation shielding material is composed of a plurality of iron plates stacked and arranged to slide relative to each other inside the horizontal slit, thereby providing a horizontal structural slit with a radiation shielding function. [Industrial applicability]

[0032] As described above, the structural slit according to the present invention is useful for building walls and the like, and is particularly suitable for structural slits installed in the walls of radiation utilization facilities. [Explanation of Symbols]

[0033] 10 pillars 12 Upper beam 14 Lower beam 16 Walls 18 Vertical slits 20 horizontal slits 22, 24, 26, 28, 30, 36 Steel plates (radiation shielding material) 32 Steel rod (shaft) 34 Torsion spring 38 Fixing member 38A Foamed resin material 38B Anchor muscle 100 structural slits D Wall thickness direction W width θ angle

Claims

1. A structural slit consisting of a slit provided at the end of a wall, The slit is provided with a plate-shaped radiation shielding material that is movable and provides radiation shielding functionality, The radiation shielding material is configured such that its positioning angle within the slit changes in accordance with the change in the width of the slit. A structural slit characterized by having a shaft portion for fixing the radiation shielding material rotatably inside the slit, and a torsion spring for biasing the radiation shielding material in a direction that closes the slit.

2. The structural slit according to claim 1, characterized in that the slit is a vertical slit extending in the vertical direction.

3. A structural slit consisting of a horizontal slit extending horizontally, provided between a wall and a lower beam, or between a wall and an upper beam, The horizontal slit is movably provided and includes a plate-shaped radiation shielding material that exhibits a radiation shielding function, The structural slit is characterized in that the radiation shielding material is composed of a plurality of iron plates stacked vertically and arranged so as to be slidable from one another within the horizontal slit.

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