JP6293427B2 - Ceiling material - Google Patents

Description

  The present invention relates to a ceiling material (ceiling board) used in buildings such as public buildings, commercial facilities, office buildings, and factories.

  The ceiling of a reinforced concrete building often has air conditioning equipment, lighting equipment, a ventilator, ventilation ducts, etc. in the upper space (behind the ceiling), as well as heat insulation and sound absorbing materials. Suspended ceiling structure is adopted. That is, this type of ceiling has a suspension bolt suspended below the frame slab, and a plurality of field receivers are suspended horizontally and parallel to each other via a hanger at the lower end of the suspension bolt. A grid-like ceiling base material is constructed by attaching a plurality of perpendicular field edges horizontally and parallel to each other via clips, and a ceiling material is attached to the lower surface of the field edge, and a gap on the outer peripheral side of the ceiling material is formed. A structure in which a parting edge that is blindfolded from below is attached to a wall surface is generally used.

  However, such a suspended ceiling swings like a swing during an earthquake, and its end collides with a frame wall or the like, and the ceiling material may be peeled off from the field edge by the impact and fall off. In particular, in recent years, many cases of falling ceiling materials have been reported in large-scale customer facilities such as gymnasiums and halls. Moreover, such buildings are often used as evacuation facilities in the event of an earthquake disaster, etc., and not only the seismic performance of the building itself, but also the ceiling's seismic performance can be prevented to prevent the ceiling material from falling. is important.

  And as a technique for preventing such a fall of a ceiling material, the thing as described in the following patent document is known.

Japanese Patent Laid-Open No. 08-093124 JP 2002-294920 A

  On the other hand, not only “ceiling that does not fall” but also “ceiling that can be dropped” is becoming widespread, and therefore, a lightweight and flexible ceiling material is sometimes used.

  However, as shown in FIG. 7, the ceiling material a may fall almost vertically depending on conditions, such as when the ceiling material a once falls from the ceiling base material b and then falls. The speed is large, especially when the ceiling material a has a rectangular shape as in the example shown in the figure, the fall speed tends to increase more and more when falling in a vertically long posture (long side is almost vertical) For this reason, even if it is a lightweight ceiling material, since a big impact generate | occur | produces as it is, it is dangerous.

  The present invention has been made in view of the above points, and its technical problem is to reduce as much as possible the danger when a ceiling material falls due to an earthquake or the like.

As means for effectively solving the technical problem described above, the ceiling material according to the invention of claim 1 is provided on one surface of a flat-plate ceiling material having a rectangular planar shape with respect to the short side of the rectangle. Te projected by a length of 0.01 to 0.5 times, the rectangular extension beauty to the short side direction parallel by both sides against one face of the ceiling material protrudes vertically, while the air resistance during falling The present invention is characterized in that a plate-like protrusion is provided which is larger than the surface.

  FIG. 1 shows a test method when the inventor of the present invention conducts a test for verifying an impact when a ceiling material is dropped. In this test, a rectangular rock wool plate having a mass of 825 grams was used as the ceiling material a, and the impact load when it was dropped from a height of 2 meters and collided with the floor f was measured. As a result, as shown in FIG. 1B, when the ceiling material a was dropped after being held so that the long side was substantially vertical, the drop speed was high and the impact load was 1821N. When the ceiling material a is held so as to be substantially horizontal as shown in (A) and dropped, it falls while swinging and rotating irregularly, the dropping speed is slow, and the impact load is 617 N Met. From this, it can be seen that even if the ceiling material has the same weight, the impact at the time of dropping can be greatly reduced if the posture when falling is substantially horizontal.

  And according to the ceiling material according to the present invention, the air resistance on one surface side is made larger than the other surface side by the resistance increasing means, and even if the posture of the ceiling material immediately before dropping is in a substantially vertical state, Due to the difference in air resistance between the one surface side and the other surface side during the dropping process, the dropping posture changes in a substantially horizontal direction.

A ceiling material according to a second aspect of the invention is characterized in that, in the configuration according to the first aspect, a required number of the plate-like protrusions are provided .

A ceiling material according to a third aspect of the invention is characterized in that, in the configuration according to the first or second aspect, the plate-like protrusion is made of a material having a specific gravity smaller than that of the ceiling material.

According to the ceiling material according to the present invention, even if the ceiling material falls in a state in which one surface and the other surface are substantially vertical, the air resistance on one surface side increases in the process of dropping. The air resistance received by the resistance increasing means acts so as to suppress a drop in a vertically long posture (a posture in which the long side is in a substantially vertical direction) . Compared with the case where the other surface changes horizontally so that one surface faces upward and falls in a substantially vertical state, the drag received by the ceiling material is significantly increased by air, and the drop speed is suppressed. Is done. For this reason, the danger by the fall of a ceiling material can be reduced effectively.

  In this case, the resistance increasing means can be easily realized by providing a required number of protrusions, irregularities or a sheet-like material on one surface of the ceiling material.

Further, if the resistance increasing means is made of a material having a specific gravity smaller than that of the ceiling material , the falling posture is more easily changed in the horizontal direction so that one surface faces upward and the other surface faces downward.

It is explanatory drawing which shows the test method which verifies the impact at the time of dropping horizontally when the ceiling material is dropped horizontally. 1 shows a preferred first embodiment of a ceiling material according to the present invention, in which (i) is a plan view, (ii) is a view taken in the direction of arrow ii in (i), and (iii) is seen in the direction of arrow iii in (i). FIG. It is explanatory drawing which shows the example of the behavior at the time of making the ceiling material by 1st embodiment fall vertically. It is a side view of the same direction as (ii) of Drawing 2 about the example of shape change of the ceiling material by a first embodiment. It is a side view of the second preferred embodiment of the ceiling material according to the present invention in the same direction as (ii) of FIG. It is a side view of the third preferred embodiment of the ceiling material according to the present invention in the same direction as (ii) of FIG. It is explanatory drawing which shows the example of a behavior when the conventional ceiling material falls.

  Hereinafter, a preferred embodiment of a ceiling material according to the present invention will be described with reference to the drawings. First, FIG. 2 shows a first embodiment.

  As shown in FIG. 2, the ceiling material 1 according to the first embodiment is made of a lightweight refractory material selected from rock wool, calcium silicate, glass wool, or the like, and has a planar projection shape with a short side L1 of about 1. A flat plate-like ceiling material body 11 having a rectangular shape with a length of about 1 m, a long side L2 of about 2 m, and a thickness of about 15 mm, and a resistance that makes the air resistance at the time of dropping larger than that of the surface 11b on the back surface 11a of the ceiling material body 11 As the increasing means, a required number (three in the example shown in FIG. 2) of plate-like protrusions 12 is provided. The back surface 11a is a surface (upper surface) on the ceiling space side and corresponds to “one surface” described in claim 1, and the front surface 11b is a surface (lower surface) on the room space side. This corresponds to “the other surface” recited in claim 1.

  The plate-like protrusion 12 is erected perpendicularly to the back surface 11a of the ceiling material body 11 and extends in a direction parallel to the short side L1. Accordingly, the plate-like protrusions 12 are provided in parallel to each other.

  The material of the plate-like protrusion 12 is not particularly limited, and for example, the same material as the ceiling material body 11 may be used. However, it is lightweight and thin, and the protruding height h from the back surface 11a of the ceiling material body 11 is In order to obtain sufficient air resistance, it is preferably 0.01 to 0.50 times the short side L1 in the planar projection shape of the ceiling material body 11.

  According to the ceiling material 1 having the above configuration, as shown by a solid line in FIG. 3, when the back surface 11a and the surface 11b of the ceiling material body 11 are in a substantially vertical state immediately before dropping, the surface 11b is in the process of dropping. The relative flow of air in contact with the surface 11b is parallel to the front surface 11b, whereas on the back surface 11a side, the relative flow of air collides perpendicularly with the plate-like protrusions 12. For this reason, the air resistance on the back surface 11a side is remarkably larger than that on the front surface 11b side, and due to the difference in air resistance, the falling posture is such that the surface 11b with low air resistance faces down and the back surface 11a with high air resistance faces up. 3, and thereafter the air resistance received by the front surface 11 b facing downward and the vortex generated in the upper space of the back surface 11 a, and so on, as shown by the alternate long and short dash line in FIG. Drops with regular behavior. For this reason, the falling speed of the ceiling material 1 is suppressed, and danger can be reduced effectively.

  Further, since the plate-like protrusion 12 extends in a direction parallel to the short side L1 of the ceiling material body 11, the air resistance received by the plate-like protrusion 12 when falling in a substantially vertical posture shown by a solid line in FIG. Become the largest. For this reason, it becomes difficult to fall in a substantially vertical posture, and this also works effectively to suppress the fall speed.

  Further, the plate-like protrusion 12 may be made of a foam material having a specific gravity smaller than that of the ceiling material main body 11, and the falling posture of the ceiling material 1 may be set so that the front surface 11b faces downward and the back surface 11a faces upward. It is effective to change the direction.

  In the example shown in FIG. 2, three plate-like protrusions 12 are provided. These plate-like protrusions 12 are close to one end in the longitudinal direction on the back surface 11 a of the ceiling material body 11 as shown in FIG. 1 is provided at the position of the ceiling material main body 11 as shown in (B), one is provided at the middle position in the longitudinal direction on the back surface 11a of the ceiling material main body 11, or as shown in (C). Various modifications can be made, such as two provided on the back surface 11a near the both ends in the longitudinal direction.

  Next, FIG. 5 shows a second preferred embodiment of a ceiling material according to the present invention, and FIG. 6 shows a third embodiment.

  Among these, in the second embodiment shown in FIG. 5, a large number of ridges 13 are formed as resistance increasing means on the back surface 11a of the ceiling material body 11, and the surface 11b is formed relatively smooth. is there. The ridges 13 formed on the back surface 11a extend in a direction orthogonal to the illustrated surface, that is, in a direction parallel to the short side of the ceiling material body 11, and when friction with air occurs in the long side direction due to a vertical drop. As compared with the smooth surface 11b, the air resistance is remarkable.

  In the third embodiment shown in FIG. 6, a plurality of sheets 14 made of woven fabric or non-woven fabric are attached to the back surface 11 a of the ceiling material body 11 as resistance increasing means. When the sheet 14 is rubbed with air due to a vertical drop, the sheet 14 is repeatedly deformed so that the sheet 14 itself undulates, and the sheet 14 receives a remarkable air resistance as compared with the smooth surface 11b. The drop posture is changed in the horizontal direction.

  In addition, as long as the resistance increase means which consists of the uneven | corrugated strip 13 etc. shown in FIG. 5 has an appropriate designability, you may form this in the surface 11b side used as the living room space side.

  In the above-described embodiment, the planar projection shape of the ceiling material main body 11 is described as a rectangular shape, but the size is not limited to 1 m × 2 m × 15 mm as in the above example. In addition, the present invention can be applied to a square shape or other polygonal shapes.

1 Ceiling material 11 Ceiling material body 11a Back surface (one surface)
11b Surface (the other side)
12 Plate-like projection (resistance increasing means)
13 Concavity and convexity (resistance increasing means)
14 sheet (resistance increasing means)
L1 Short side L2 Long side

Claims (3)

On one surface of a flat ceiling material planar shape is rectangular, projecting in the 0.01 to 0.5 times the length relative to the short sides of the rectangle, extending Beauty, the ceiling to the short side parallel to the direction of the rectangular A ceiling material, characterized in that a plate-like protrusion is provided to make the air resistance at the time of dropping larger than that of the other surface by projecting both surfaces perpendicular to one surface of the material. The ceiling material according to claim 1, wherein a required number of the plate-like protrusions are provided . The ceiling material according to claim 1, wherein the plate-like protrusion is made of a material having a specific gravity smaller than that of the ceiling material.

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