JP6721264B2 - Ceiling drop prevention structure - Google Patents

Description

The present invention relates to a ceiling fall prevention structure, and more particularly to a ceiling fall prevention structure using a fail-safe net.

The various disasters caused by the Great East Japan Earthquake last year are new to memory. Among various disasters, as a disaster that occurs inside a building, a tragic accident in which a ceiling falls to cause human injury is cited.

In response to such a situation, safety measures related to the ceiling fall prevention have been earnestly researched and developed in various fields including the country. For example, in Patent Document 1, a ceiling fall prevention net for securing a stable strength and a ceiling fall prevention structure are provided for the purpose of providing a ceiling fall prevention net. After winding the weft thread of the fall-prevention net several times, the core reinforcement member is arranged outside and the sewing machine is sewn with an end portion, and a hole is formed in a part of the mesh of the fall-prevention net. There is disclosed a fall prevention net in which a reinforcing portion formed by winding a thread-like mesh reinforcing member is formed on a surrounding weft thread and a warp thread.

However, in the ceiling fall prevention net of Patent Document 1, a racing bar is attached to the metal base of the ceiling, and the net is fixed to the racing bar. In such a case, if the ceiling drops, the net may also drop together. In addition, since the load of the net is applied to the existing ceiling, there is a problem that the existing ceiling must be repaired or reinforced.

JP, 2005-63811, A

The present invention has been made in view of the above-mentioned problems, and even under an existing ceiling where it is difficult to remove the ceiling or take earthquake-proof measures, temporary safety until evacuation when the ceiling falls during an earthquake is provided. The purpose is to provide a ceiling fall prevention structure for securing the ceiling.

The present invention is grasped by the following configurations in order to achieve the above object.
(1) A first aspect of the present invention is a ceiling fall prevention structure, which includes a first support member fixed to a side frame of an installation space and fixed to a first side frame, and a second side. Support member including a second support member fixed to one of the frames, a main cable having a terminal attached to the first support member and partitioning the installation space, and a terminal having the second support member. Attached to the main cable, the outer cable is installed above the end of the main cable in a direction intersecting with the main cable, a net fastened to the main cable and the outer cable, and the net to the main cable And a fastening member that is fastened to the outer peripheral cable.

(2) In the configuration of (1) above, the terminal of the main cable and the terminal of the outer peripheral cable may be rotatable with respect to the first support member and the second support member, respectively.

(3) In the configuration of (1) or (2) above, the support member includes a flange portion, and a protrusion portion protruding from the flange portion, to which the end of the main cable or the end of the outer peripheral cable is attached. The terminal of the main cable and the terminal of the outer peripheral cable may be formed in a fork shape, and may be pinned with the protruding portion interposed therebetween.

(4) In the configuration according to any one of (1) to (3), the main cable is a first main cable to which a first side of the net is fastened, and a second main cable to which a second side of the net is fastened. A main cable; and a third main cable to which the net is fastened between the first main cable and the second main cable, the net being arranged with reference to the center of the third main cable. Good.

(5) In the configuration of the above (4), the third main cable may be installed eccentrically on either side of the first main cable and the second main cable.

(6) In the configuration according to any one of (1) to (5), the net is fastened by lacing two threads of the net along the main cable by the fastening member on the main cable. The fastening member may pass through all the meshes for the net and the main cable.

(7) In the configuration according to any one of (1) to (6), the net is fastened by lacing the two threads of the net along the outer peripheral cable with the fastening member to the outer peripheral cable. The fastening member may pass through all meshes where the net and the outer peripheral cable meet.

(8) In the configuration according to any one of (1) to (7) above, when the net has a joint, the tip of the joint is directed upward and the line of the joint is the main portion. You may make it arrange|position so that it may cross a cable.

According to the present invention, there is provided a ceiling fall prevention structure for securing temporary safety until evacuation when the ceiling falls during an earthquake, even under the existing ceiling where it is difficult to remove the ceiling or take measures against earthquakes. can do.

It is a side view which shows the ceiling fall prevention structure which concerns on embodiment of this invention. It is a top view which shows the ceiling fall prevention structure which concerns on embodiment of this invention. It is a figure which shows the example which fixes a support member to a body. It is a figure which shows the example which fixes the terminal of a cable to a support member. It is a figure which shows a fork type as an example of the terminal of a cable. It is a figure which shows the clip type as another example of the terminal of a cable. It is a perspective view which shows the relationship of arrangement|positioning of a net and a main cable. It is a top view which shows the state which fixed the net to the main cable with the fastening member. It is a side view which shows the state which fixed the net to the main cable with the fastening member. It is a top view which shows the state which fixed the net to the outer peripheral cable with the fastening member. It is a top view which shows the relationship of arrangement|positioning of an outer peripheral cable and a main cable. It is a side view which shows the state which fixed the net to the outer peripheral cable with the fastening member. It is a flowchart which shows the installation method of a ceiling fall prevention structure.

Hereinafter, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same elements are denoted by the same numbers throughout the description of the embodiments.

(Structure of the embodiment)
As shown in FIG. 1, the ceiling fall prevention structure 1 includes a support member 10, a cable 20, a net 30, and a fastening member 40 (see FIG. 8). Then, for example, it is provided on the ceiling slab X, and is installed under a suspended ceiling F including a suspension bolt A, a hanger B, a field edge receiver C, a field edge D, and a ceiling board E. The support member 10 is fixed to the side frame Y, and the cable 20 is installed on the pair of support members 10 facing each other. The net 30 is fixed by being laced to the cable 20 by the fastening member 40. Hereinafter, these will be described in detail with reference to FIG.

As shown in FIG. 2, the support member 10 is a support metal fitting that is fixed to the frame body Y on the side of the installation space for installing the cable 20, and includes the first side W1 and the side W1' opposite to the first side W1. A pair of first supporting members 101 fixed to the frame Y, a pair of first side members W2 positioned in a direction intersecting the first lateral W1 and a pair of first lateral members W2' opposed to the second lateral W2'. 2 support members 102 are included. The first support member 101 and the second support member 102 may have the same structure or different structures. In the present embodiment, an example in which the support member 10 having the same structure is adopted is shown, and the first support member 101 and the second support member 102 are referred to depending on the installation location.

As shown in FIG. 3, the support member 10 includes a flange portion 11 and a protrusion portion 12 that protrudes from the flange portion 11 and to which a terminal 20a of a cable 20 (a main cable 21 and an outer peripheral cable 22 as described later) is attached. I have it. The flange portion 11 is fixed to the body Y with bolts and nuts. Here, the skeleton Y is preferably a steel frame structure as shown in the figure, but when it is fixed to the RC structure or a wooden skeleton, consideration should be given to ensuring a large safety factor.

As shown in FIG. 4, the projecting portion 12 of the support member 10 has a substantially triangular shape in a side view so that the terminal 20 a of the cable 20 can rotate within a certain range with respect to the support member 10. .. As shown in FIGS. 4 and 5, when the terminal 20a of the cable 20 (the main cable 21 and the outer peripheral cable 22 as described later) is of a fork type (formed in a fork shape), the protrusion 12 is formed. When the suspended ceiling F falls after the installation of the ceiling fall prevention structure 1 and the net 30 receives the load thereof, the cable 20 bends and the impact can be absorbed by sandwiching the pin.

When the terminal 20a of the cable 20 is of a fork type, the pin 20b is inserted into and fixed to a pair of forks sandwiching the protruding portion 12 of the support member 10. However, as shown in FIGS. 4 and 5, both ends of the pin 20b are fixed. The split pin 20c is inserted to secure the fixing.

The terminal 20a of the cable 20 may be other than the fork type, and may be, for example, a clip fixed as shown in FIG. In short, any material that can exhibit a predetermined strength and can rotate with respect to the support member 10 can be preferably used. However, in the case where the clip is fixed, as shown in FIG. 6, the clip 20d is used from the upper side (ceiling side) of the cable 20 in consideration of prevention of falling.

The cable 20 is a wire or the like for fixing a net 30 described later, and is classified into two types of cables. That is, the cable 20 includes a main cable 21 whose ends are attached to the pair of first supporting members 101, and an outer peripheral cable 22 whose ends are attached to the pair of second supporting members 102. The main cable 21 is a cable that is installed so as to partition an installation space according to the size of the net 30, and the outer peripheral cable 22 is in a direction intersecting with the main cable 21 and above the end portion of the main cable 21. It is a cable to be installed.

As shown in FIG. 2, when it is necessary to partition the installation space by the installation space of the ceiling fall prevention structure 1 and the size of the net 30, the main cable 21 is connected to the first side of the net 30. 1 main cable 211, 2nd main cable 212 with which the 2nd side of net 30 is fastened, and 3rd main cable with which net 30 is fastened midway between 1st main cable 211 and 2nd main cable 212 213 and 213 can be included. In this case, the net 30 is stretched so as to be pushed out in the left-right direction, the left-right upper corner direction, and the left-right lower corner direction with the center of the third main cable 213 as a reference point. It is set so that 212 is slightly protruded.

At this time, the third main cable 213 is positioned midway between the first main cable 211 and the second main cable 212, but is not limited to the center of the two, and as shown in the figure, It may be installed on one side of the second main cable 212 in a biased manner. That is, the position of the third main cable 213 may be set in consideration of the arrangement condition of the suspended ceiling F and the size and weight of the ceiling plate E.

With respect to the main cable 21, the outer peripheral cable 22 is installed in a direction intersecting with the main cable 21 and above both ends of the main cable 21, and includes a first outer peripheral cable 221 and a second outer peripheral cable 222.

The net 30 is fastened to the main cable 21 and the outer peripheral cable 22 by fastening members 40. As the net 30, a lightweight net having a unit area weight of about 0.2 kg/m ² and having sufficient strength is used. It is preferable to use a square mesh net that is easy to handle and has a beautiful finish even when installing (construction), but if the mesh is fine, for example, 22 mm, it is easy to capture metal fittings such as hangers and clips when the ceiling falls. Is more preferable.

The details of fastening the net 30 to the main cable 21 and the outer peripheral cable 22 will be described later as a method of installing (constructing) the ceiling fall prevention structure 1, but the outline is as follows. First, as shown in FIG. 7, the net 30 and the main cable 21 are arranged. That is, when the net 30 has a joint, it is arranged so that the line L of the joint of the net 30 and the main cable 21 intersect. At this time, the net 30 is configured such that the tip of the joint faces the upper side (ceiling side). Then, as shown in FIG. 8, the main cable 21 is aligned with the mesh of the net 30, and first, temporarily fixed 41 by using the fastening member 40 and the like. If the meshes are misaligned, the main cable 21 will swell, and the net 30 will be biased. Therefore, the main cable 21 must be matched with the mesh of the net 30.

Then, the net 30 is fastened to the cable 20 by a fastening member 40 such as a racing rope, but first fastened to the main cable 21. At that time, as shown in FIG. 8, the fastening member 40 is laced so as to pass through all the meshes where the net 30 and the main cable 21 fit together. Further, as shown in FIG. 9, the net 30 is fastened by the fastening member 40 by lacing the two threads 31, 31 of the net 30 along the main cable 21 onto the main cable 21.

When the fastening of the net 30 to the main cable 21 is completed, the net 30 is fastened to the outer peripheral cable 22, as shown in FIG. 10. As described above, the outer peripheral cable 22 is located above the end portion of the main cable 21 as shown in FIG. 11 (see the side view at the lower right in which the intersection of the main cable 21 and the outer peripheral cable 22 is enlarged and shown). Since it is installed, the excess portion of the net 30 is wound around the outer peripheral cable 22 as shown in FIG. The procedure of temporary fixing 41 and racing is the same as that of the main cable 21. By the above, the ceiling fall prevention structure 1 is prepared.

(Experimental example)
In order to confirm the effect of the ceiling fall prevention structure 1 according to this embodiment, the following full-scale experiment was conducted.

The net 30 was installed with the construction area of the ceiling fall prevention structure 1 being about 390 m ² (16 m×24 m), and the following two points were confirmed. The net 30 had a mesh of 22 mm and a weight of about 0.2 kg/m ² .
(1) A ceiling having a weight of 13.5 kg/m ² and an area of 1.8 m×15.5 m was dropped off twice, and the damaged state of the cable 20, the net 30, and the support member 10 and the load transmission were confirmed.
(2) The ceiling with a weight of 27.5 kg/m ² and an area of 1.8 m×7.6 m is dropped only on the net 30 at the center of the ceiling span to check the damaged state of the net 30 and the capturing condition of metal fittings such as hangers and clips. confirmed.

In any of the above (1) and (2), it was confirmed that the cable 20, the net 30, and the support member 10 were not damaged, and all the metal fittings such as hangers and clips which are the constituent members of the ceiling were captured. It was confirmed that it was done.

(Installation method)
Next, a method of installing (constructing) the ceiling fall prevention structure 1 according to this embodiment will be described with reference to FIG. 13. Prior to the installation, it is confirmed whether or not the target building is provided with a sufficient structure such as columns and beams for installing the ceiling fall prevention structure 1. If the building does not have sufficient columns and beams, install them.

Installation (construction) of the ceiling fall prevention structure 1 is performed in the following procedure. First, confirmation and cleaning before construction are performed (step S10). Check that the related facility work and the preceding work have been completed, and confirm the installation location of the hardware (pillars, etc.) relating to the installation of the cable 20 prepared in advance, and check the installation position of the cable 20 and net 30. Confirm. At that time, before constructing the ceiling fall prevention structure 1, the construction site is carefully cleaned so that dirt and various metal fittings do not adhere to the net 30.

Next, the level ink and the installation position of the support member 10 are marked on the wall surface of a metal object (such as a pillar) related to the installation of the cable 20 (step S11). Thereby, the finish and the arrangement of the cable 20 and the net 30 are confirmed. After marking, the installation intervals of the support members 10 and thus the cables 20, and the installation heights of the support members 10 and thus the installation heights of the cables 20 and nets 30 are checked for conformity with the architectural drawings. In addition, it is reconfirmed whether or not there are any suspended objects, steps, slopes, etc. that are not planned, which may be obstacles when installing the ceiling fall prevention structure 1.

Next, the support member 10 (support metal fitting) is installed according to the marking position (step S12). The flange portion 11 of the support member 10 is fixed to the wall surface of a metal object (such as a pillar) for installing the cable 20 with bolts and nuts. Fixing is performed according to the specified torque. In addition, when the support member 10 is installed prior to the construction, it is confirmed whether the installation is properly performed.

Next, the installation space for erection of the main cable 21 is divided according to the size of the net 30 (step S13). The installation space is preceded by the first main cable 211 and the second main cable 212 as the main cables 21 located on the division line, and the third main cable 213 located in the middle of the compartment between them. It will be installed. Here, for example, when the installation space is divided into three, that is, the first section, the second section, and the third section, the first main cable 211 of the second section located in the middle is the first main cable 211 of the first section. Alternatively, the second main cable 212 and the second main cable 212 in the second section are also used as the first main cable 211 or the second main cable 212 in the third section, respectively.

Next, the first main cable 211, the second main cable 212, and the third main cable 213 are installed and tensioned (step S14). The terminal 20a of each cable 20 is of a fork type, and is pinned and fixed by a pin 20b while sandwiching the protruding portion 12 of the support member 10. After fixing, the adjuster located at the base end of the fork of the terminal 20a is rotated to a predetermined value with a torque wrench to tension the cable 20. At the time of fixing, the split pins 20c are inserted into both ends of the pin 20b to surely fix them. The terminal 20a of the cable 20 may be formed in a ring shape by fixing clips instead of the fork type, but in that case, the plurality of clips 20d are attached so that they are all above the cable 20. This is to prevent falling. The cable 20 should be constructed so that there are no undulations or kinks, and care should be taken to ensure that there are no undulations or kinks during storage. When installing the cable 20, the cable 20 may be pulled up by a laver block or the like and fixed to the support member 10 as necessary.

Next, the outer peripheral cable 22 is installed and tensioned (step S15). The outer peripheral cable 22 is installed so as to cross the main cable 21 and pass above the end of the main cable 21. The other points are the same as the installation and tension of the main cable 21 and will be omitted.

Next, the pre-installation preparation of the net 30 is performed (step S16). The net 30 is fixed to the cable 20 by lacing it with a fastening member 40 (racing rope), and the fastening member 40 is preliminarily set to a length required for one lacing in consideration of the outer diameter of the cable 20 to be used. It is convenient if you cut it.

When the net 30 is divided in the installation space due to factors such as the size of the ceiling, steps, and gradients, reconfirm that the installation positions and installation directions of the plurality of nets 30 are correct. At that time, marking is performed on the corresponding positions of the third main cable 213 and the net 30. For marking, it is desirable to use a temporary knot using a racing rope or the like of the fastening member 40. The position where the temporary knot is performed is a position where the line L of the joint of the net 30 intersects with the third main cable 213, and is substantially at the center of the third main cable 213. The location of this marking (temporary knot) serves as a reference point for subsequent work.

Next, the net joint is marked on the main cable 21 (step S17). In order to align the “eyes” of the net 30, the main cable 21 is marked out for each line L of the joint line of the net 30. This marking is performed on the first main cable 211 and the second main cable 212 in addition to the third main cable 213 having the reference point. Moreover, it does to all the divided divisions.

Finally, based on the work in each of the above steps, the net 30 is installed on the main cable 21 and the outer peripheral cable 22 (step S18). The net 30 is arranged so that the tip of the joint faces upward (toward the ceiling) and the line L of the joint intersects with the main cable 21. Then, the net 30 is laced and fixed to the cable 20 by the fastening member 40. Hereinafter, this step will be described in detail.

First, when the net 30 starts to be stretched, the net 30 is driven out in six directions (left and right sides, left and right upper corners, left and right lower corners) around the reference point on the third main cable 213 provided for each section. At this time, the reference points on the net 30 and the third main cable 213 are surely aligned with each other. Then, the net 30 and the main cable 21 are temporarily fixed 41 by using a racing rope or the like of the fastening member 40. At that time, the meshes of the net 30 are surely aligned. If the meshes are misaligned, not only will the net 30 become wavy and the finish will not be clean, but the main cable 21 may be bent, and the desired effect may be impaired.

Second, the net 30 is laced and fixed to the main cable 21 by the fastening member 40. The fastening member 40 is tied so as to be inconspicuous at a portion intersecting the line L of the joint of the net 30. The temporary fixing 41 performed earlier is released and removed when the racing is completed. The lacing is performed by lacing the two yarns 31 and 31 corresponding to the main cable 21 on the main cable 21, and the fastening member 40 passes through all the meshes of the net 30 and the main cable 21.

Thirdly, the net 30 is temporarily fixed 41 to the outer peripheral cable 22 using a racing rope or the like of the fastening member 40. At that time, as in the case of the main cable 21, the meshes of the nets 30 are surely aligned. Also, the net 30 left at the end is properly wound around the outer peripheral cable 22. After the lacing with the main cable 21 is completed, the net 30 is fixed to the outer peripheral cable 22 by lacing, and the temporary fixing 41 is released and removed. The ceiling fall prevention structure 1 according to the present embodiment is installed through the above steps.

(Effects of the embodiment)
The ceiling fall prevention structure 1 according to the present embodiment can be installed in any place, but in particular, a building where many people gather or come and go, for example, a school gymnasium, an indoor pool, an indoor hot spring facility, a multipurpose hall, a hospital, a factory. -It can be used for buildings such as warehouses, station buildings, large commercial facilities, amusement facilities, etc.If the ceiling should fall during an earthquake, it temporarily receives the structural members of the ceiling and evacuates many unprotected people. It is suitable for securing the time and mental space that can be taken and for minimizing the human damage.

Although the embodiment has been described above, the present invention is not limited to the specific embodiment and includes various modifications, which is claimed by a person skilled in the art. It is clear from the description of the range.

1... Ceiling fall prevention structure 10... Support member (support metal fitting)
11... Flange 12... Projection 101... First support member 102... Second support member 20... Cable 20a... Terminal 20b... Pin 20c... Split pin 20d... Clip 21... Main cable 211... First main cable 212... Second Main cable 213... Third main cable 22... Peripheral cable 221... First outer cable 222... Second outer cable 30... Net 40... Fastening member (racing rope)
41... Temporary fixed L... Line of net connection

Claims (7)

It is a ceiling fall prevention structure that is provided in a state not connected to the ceiling,
A pair of first support members fixed to the side frame of the installation space and fixed to both side frames of the first side, and a pair of second support members fixed to both side frames of the second side. A support member including
A main cable in which terminals at both ends are attached to the pair of first support members and which is installed so as to partition the installation space;
Outer peripheral cables having ends at both ends attached to the pair of second support members and erected above the end portion of the main cable in a direction intersecting with the main cable,
A net fastened to the main cable and the outer peripheral cable,
E Bei and a fastening member for fastening the net to the main cable and the outer peripheral cable,
The pair of first support members and the pair of second support members respectively have a flange portion and a protrusion portion protruding from the flange portion, to which the terminal of the main cable or the terminal of the outer peripheral cable is attached. Prepare,
A ceiling drop prevention structure characterized in that the ends of the main cable and the ends of the outer peripheral cable are formed in a fork shape, and pinned with the protruding portion sandwiched therebetween . Claim 1, wherein the ends of the terminal of the opposite ends of the terminal and the peripheral cable of said main cable is rotatable respectively with respect to the pair of first support member and the pair of second support members Ceiling fall prevention structure described in. The main cable includes a first main cable to which the first side of the net is fastened, a second main cable to which the second side of the net is fastened, and the first main cable and the second main cable. A third main cable to which the net is fastened,
Ceiling fall prevention structure according to claim 1 or 2, characterized in that said net is arranged relative to the center of the third main cable. The ceiling fall prevention structure according to claim 3 , wherein the third main cable is installed erratically on either side of the first main cable and the second main cable. The net is fastened by lacing two threads of the net along the main cable by the fastening member to the main cable, and the fastening member makes all the meshes of the net and the main cable compatible. The ceiling fall prevention structure according to any one of claims 1 to 4 , wherein the ceiling fall prevention structure is provided. The net is fastened by lacing two threads of the net along the outer peripheral cable to the outer peripheral cable by the fastening member, and the fastening member makes all the meshes where the net and the outer peripheral cable meet. It passes through, The ceiling fall prevention structure of any one of Claim 1 to 5 characterized by the above-mentioned. When the net has a seam such that said joint of the tip faces upward, and from claim 1, wherein the seam line is characterized in that it is arranged so as to intersect with the main cable 6 The ceiling fall prevention structure according to any one of 1.

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