KR980009710A - Safety net switchgear - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Safety net switchgear.

2. The problem to be solved by the invention

Safety net opening and closing device for installing a support having a safety net on a beam, truss, or slab forming a steel structure, and easily expanding the safety net by pulling a string using a pulley or roller, and also easily folding and dismantling it. The purpose is to provide.

3. Summary of the Solution of the Invention

The present invention is a guide means installed in the longitudinal direction on the support structure of each layer; A plurality of moving means coupled to the respective guide means to move in the front and rear directions; A first connection member connecting the moving means coupled to the one guide means and the moving means coupled to the other guide means and having a safety net attached thereto; And it provides a safety net opening and closing device comprising a second connecting member for connecting the plurality of moving means coupled to each of the guide means to move the moving means back and forth.

4. Important uses of the invention

When expanding the steel structure of buildings, factories, etc., the tower crane is mounted on the lifting part of the building material, so that the frequent installation and dismantling of the safety net according to the lifting of the building material can be easily and manually performed.

Description

Safety net switchgear

The present invention relates to an opening and closing device of a safety net installed on a steel structure in order to prevent falling objects or fall of the worker at the construction site, in particular, by pulling the opening and closing adjustment straps on one side, so that the safety net can be unfolded and folded. It relates to a safety net switchgear.

In general, safety accidents of lower-level workers due to accidental fall due to inadvertent fall during construction of steel frame construction, factory truss, renovation work in construction site, or falling of construction materials such as construction tools or bolts. Safety nets are in place to prevent outbreaks.

Here, the safety net is produced by weaving a reinforcing rope according to the drop load in a predetermined mesh (mesh) at predetermined intervals in the horizontal and vertical directions at predetermined intervals, wherein the interval of the rope so that the falling worker is not caught by the rope. Install at intervals of -3M.

In the installation of the safety net manufactured as described above, in the related art, as shown in FIG. 1, the ropes are laid to install beams and trusses in the beams of steel structures so as to cover the space of each layer. It is generally installed to be located at the lower end of the worker to prevent the worker from tripping over the net during the trip.

In the conventional safety net installation work, the safety net installed on each floor is not dismantled until the work of the steel structure is completed, but some spaces of each floor lifting the construction materials by the tower crane are left empty without installing the safety net, In addition, the tower crane dismantles the safety net when lifting and lowering the building materials, and when the lifting work is completed, the safety net is installed again.

As a result, the safety net is not installed at the building materials lifting site due to the hassle and risk of frequent installation and dismantling of safety nets in the work space of the tower crane. However, there is a problem that a safety accident occurs due to the fall of materials or tools.

The present invention has been made in order to solve the above problems, install a support having a safety net on the beam or truss constituting the steel structure, and easily expand the safety net on the steel structure by pulling with a string using a pulley It is an object of the present invention to provide a safety net opening and closing device that can be easily installed and dismantled.

In addition, another object of the present invention to provide a semi-automatic safety net opening and closing device that can be opened and closed by the electric force.

In addition, another object of the present invention is to provide a safety net opening and closing device which is installed in the building lifting opening can open and close the safety net from time to time.

1 is a schematic diagram showing a state in which a safety net is mounted on a general steel structure.

Figure 2 is an exploded perspective view showing the configuration of the first embodiment of the safety net opening and closing device according to the present invention.

3 is a cross-sectional view showing a state in which the beam is coupled to the main body in the safety net opening and closing device according to the present invention.

Figure 4 is a cross-sectional view showing the configuration of the moving frame in the safety net opening and closing device according to the present invention.

5 is a perspective view of the safety net is installed on the steel structure according to the present invention.

6 is a plan view schematically showing a state in which the safety net is opened and closed in a state in which the safety net opening and closing device according to the present invention is mounted on the steel structure.

7 is a plan view showing a semi-automated state as a second embodiment of the safety net switchgear according to the present invention.

8 is an exploded perspective view showing the configuration of a third embodiment of the safety net opening and closing device according to the present invention.

9 is a cross-sectional view showing a state in which the beam is coupled to the main body in the safety net opening and closing device according to the third embodiment.

10 is a plan view schematically showing a state in which the safety net is opened and closed in a state in which the safety net opening and closing device according to the third embodiment is mounted on the steel structure.

11 is a perspective view of the safety net is installed on the steel structure according to the third embodiment.

12 is a perspective view showing the configuration of the fourth embodiment of the safety net opening and closing device according to the present invention installed in the slab opening of the building.

Figure 13 is a cross-sectional view showing the configuration of the clamp fastened to the slab opening in the safety net opening and closing device according to the fourth embodiment.

14 is a state diagram in which the safety net opening and closing device of the fourth embodiment is installed in the slab opening.

* Explanation of symbols for the main parts of the drawings

1: beam 2: common member

3: first clamp 4: pressure screw

5: 2nd clamp 6: guide rod

7: fixing screw 8: moving frame

9: link 10: pulley

11: bat 12a, 12b: rope

13: opening and closing adjustment strap 14: compression spring

15: fixing piece

In order to achieve the above object, the present invention provides a guide means installed in the longitudinal direction on the support structure of each layer; A plurality of moving means coupled to the respective guide means to move in the front and rear directions; A first connection member connecting the moving means coupled to the one guide means and the moving means coupled to the other guide means and having a safety net attached thereto; And it provides a safety net opening and closing device comprising a second connecting member for connecting the plurality of moving means coupled to each of the guide means to move the moving means back and forth.

In addition, clamping means mounted to the support structure of each layer; Guide means mounted in the longitudinal direction to the clamping means; Fixing means for coupling the clamping means and the guide means; A plurality of moving means coupled to the respective guide means to move in the front and rear directions; A first connection member connecting the moving means coupled to the one guide means and the moving means coupled to the other guide means and having a safety net attached thereto; And it is woven orthogonal to the first connection member and provides a safety net opening and closing device comprising a means for providing the front and rear movement force to the moving means.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

First embodiment

Figure 2 is an exploded perspective view showing the configuration of the first embodiment of the safety net opening and closing device according to the present invention, Figure 3 is a cross-sectional view showing a state that the beam is coupled to the main body in the safety net opening and closing device according to the present invention, Figure 4 is Sectional view showing the structure of the moving frame in the safety net opening and closing device according to Figure 5 is a perspective view of the safety net is installed on the steel structure according to the present invention, Figure 6 is a safety net opening and closing in a state that the safety net opening and closing device according to the present invention is mounted on the steel structure It is a top view which shows schematically the state to become.

In the figure, "1" is the beam, "2" is the main support, "3" is the first clamp, "4" is the pressure screw, "5" is the second clamp, "6" is the guide rod, and "7" is fixed. Screw, "8" is a moving frame, "9" is a hook, "10" is a pulley, "11" is a bat, "12a" is a longitudinal rope, "12b" is a horizontal rope, "13" is an opening / closing strap And "14" represent the compression springs, respectively.

Safety net opening and closing device according to the present invention is implemented to easily and safely perform the installation and dismantling work of the safety net in each part of the steel structure and the lifting material construction site, as shown in Figure 2, A supporting body 2 is provided which is supported and fixed over the flange portion of each horizontal beam 1 constituting the steel frame structure.

Here, the supporting member 2 is formed in a U-shape on both sides thereof so as to be independent of the flange portion of each of the beams 1, wherein the width of one side portion of the supporting member 2 is beam-shaped. The thickness of the flange portion of one side is formed to fit the width, the other c-width is formed to be larger by a predetermined size than the thickness of the flange of the beam (1). Therefore, when the main body 2 is installed in the beam 1, the beam 1 is accommodated in the c-width of one side to be pushed inward, and the flange of the beam 1 is easily retracted to the other side. .

In addition, the c-shaped first clamp (3) is inserted into the other c width of the main body 2, the upper length is short and the lower length is formed by a predetermined length, and the other end side of the beam (1) is provided. It is inserted into the flange part to support and fix it.

At this time, the other side width side portion and the bottom portion of the supporting member 2 is mounted so that the pressure screw (4) is penetrated to tighten the flange portion of the beam (1) by pressing the side surface and the bottom surface of the first clamp (3). To lose.

A second clamp 5 having a circular ring shape is mounted on an upper surface of the supporting member 2, and a guide rod 6 having a predetermined length is fitted into a ring of the second clamp 5. It is provided with a fixing screw (7) penetrating the ring of the clamp (5) from the side, through which to fix the guide rod (6).

The guide rod 6 is fitted to its inner side, and one side thereof is equipped with a plurality of moving frames 8 having a connecting ring 9 so that the transverse rope 12b of the safety net is connected. A pulley 10 is installed inside the mold 8 to smoothly move while contacting the circumferential surface of the guide rod 6.

On the other hand, the safety net is produced by weaving the rope (11) made of a predetermined network and the rope (12) at predetermined intervals in the horizontal and vertical directions to enhance the strength of the bat (11).

Here, the longitudinal side rope (12a) of the safety net is connected to the beam (1), the horizontal side rope (12b) is fixed to the connecting ring (9) provided in the plurality of moving frame (8).

In this embodiment, the horizontal rope (12b) is tied to the connecting ring (9) of both the moving frame (8) to be tightly supported, the compression spring in the central portion of the horizontal rope (12b) to have a cushioning force during the fall accident (14) is mounted.

In addition, the connecting ring (9) of the both sides of the moving frame (8) is equipped with an opening and closing adjustment strap 13 is connected to the dual to be able to fold and expand the safety net to perform the opening and closing of the safety net.

Referring to the operation according to the first embodiment of the present invention configured as described above are as follows.

First, when the safety net is installed on the steel frame structure of the rectangular shape, the support body 2 is independently installed on both ends of each horizontal beam (1) forming the steel frame structure, wherein the flange thickness of one side of the beam (1) One side c-width of the supporting body 2 is fixed and fixed, and the other side c-width of the supporting body 2 and the first clamp 3 are overlapped and inserted into the other flange portion of the beam 1, and the pressure screw ( 4) is advanced to tighten the first clamp 3 so that the beam 1 and the supporting member 2 are fixed.

In addition, the guide rod (6) is inserted into the second clamp (5) provided on the upper portion of the supporting member (2), and tightened with a fixing screw (7) to fix the horizontal rope woven in the horizontal direction of the safety net ( 12b) is inserted into the guide bar 6 while being connected to the connecting ring 9 of the movable frame 8.

At this time, the pulley 10 provided in the moving frame 8 is in contact with the circumferential surface of the guide rod 6 to move back and forth to expand and fold the safety net.

Here, one of the two opening and closing adjustment straps 13 is connected to the connecting ring 9 of the moving frame 8 mounted on the horizontal side rope 12b of the safety net, so as to hold the unconnected adjustment straps. When pulled, the opening and closing adjustment strap 13 connected to the connecting ring 9 of the moving frame 8 is unfolded by the force, and is unfolded. On the contrary, when dismantling the safety net, the connecting ring 9 is connected to the connecting ring 9. By pulling the opening and closing adjustment strap 13 is to be folded by moving while receiving the guide of the guide rod 6 from the pulley 10 provided in the last moving frame (8).

Second embodiment

A second embodiment of the present invention is shown in FIG. 7, and its configuration and operation will be described in detail as follows.

Figure 7 shows an example showing a semi-automated state as a second embodiment of the safety net switchgear according to the present invention.

In the drawings, "31", "32" are first and second winches, "31a" and "32a" are inner drums, "31b" and "32b" are outer drums, "33" are first power switches, and "34". "2" represents a second power switch, "35" represents a conveying roller, and "36" represents a conveying rope.

In the second embodiment, it is implemented to fold and unfold the safety net semi-automatically by the electric force, as shown in the drawing is provided in the opposite diagonal direction of the horizontal beam (1), respectively, First and second winches 31 and 32 for unwinding and winding the transfer rope 36 and first and second power switches 33 and 34 for supplying power to the first and second winches 31 and 32, respectively. And a feed roller 35 mounted on each corner side surface of the rectangular beam 1 to guide the feed of the feed rope 36 connected to the connecting ring 9 of the moving frame 8. It is structured.

Here, each of the first and second winch (31, 32) is provided with a double drum to wind the conveying rope 36, of which the conveying rope drawn from the inner drum (31a) of the first winch (31) 36 is connected to the connecting ring 9 'of the far end moving frame 8', and the conveying rope 36 drawn out of the outer drum 31b is opposite the far end moving frame 8 through the conveying roller 35. It is connected to the connecting ring 9 of "".

In addition, the respective transport ropes 36 drawn out from the inner drum 32a and the outer drum 32b of the second winch 32 are connected to the drum of the first winch 31 in the opposite direction. That is, the outer drum 31b of the first winch 31 and the conveying rope 36 drawn out from the inner drum 31a are connected to the connecting ring of the moving frame, respectively.

Therefore, when installing the folded safety net, first, the second winch 32 is driven by turning on the second power switch 34, but the feed drawn out to the inner and outer drums 32a and 32b thereof. As the rope 36 is wound, the connecting ring 9 "of the foremost moving frame 8" is pulled. At this time, the moving frame 8 "is connected at predetermined intervals by a connecting strap provided in the safety net. The safety net is to be unfolded in sequence by taking the guide rod (6) from the front frame (8 ").

On the contrary, when the safety net is folded, the first winch 31 is operated by turning on the first power switch 33. As a result, the inner and outer drums 31a and 31b are gradually wound around the feed rope 36 connected to the connecting rings 9 'and 9 "of the far end moving frames 8' and 8". End moving frame (8 ', 8 ") is to be folded in the sequential by pushing the next moving frame while being folded by the guide rod (6).

Since the first winch 31 and the second winch 32 respectively convey the conveying rope 36 by the conveying roller 35, both the moving frames 8 'and 8 "can be unfolded and folded at the same time.

Third embodiment

8 to 11 illustrate a third embodiment of the present invention. The configuration and operation thereof will be described in detail as follows. 8 is an exploded perspective view showing the configuration of a third embodiment of the safety net opening and closing device according to the present invention, Figure 9 is a cross-sectional view showing a state in which the beam is coupled to the main body in the safety net opening and closing device according to the third embodiment, FIG. 3 is a plan view schematically illustrating a state in which the safety net is opened and closed in a state where the safety net switchgear is mounted on the steel structure, and FIG. 11 is a perspective view of the safety net installed in the steel structure according to the third embodiment.

In the figure "51" is a rail, "52" is a guide surface, "53" is a moving frame, "54" is a roller, "55" is a connecting ring, "56" is a second connecting piece, "57" is a fastening hole, " 58 "is the fixing bolt," 59 "is the U-shaped clasp, respectively.

The safety net opening and closing apparatus of the third embodiment is a modified example of the first embodiment in which the rope is moved by using a pulley, and as shown in FIGS. 8 and 9, first, the supporting body having the same configuration as that of the first embodiment. 42 and the first clamp 43 are provided and fixed to each beam 1 of the steel structure.

In addition, a first connection piece 46 having a predetermined size having a fastening hole 47 is formed at one side of the supporting member 42. One side of the first connecting piece 46 is provided with a rail 51 in the longitudinal direction of the beam (1), the side of both ends of the rail 51 corresponding to the fastening hole 47 of the first connecting piece 46 The second connection piece 56 having the fastening hole 57 is installed by welding or the like, and a female screw is formed inside the fastening holes 47 and 57. (Alternatively, the bolt may be penetrated into the fastening holes 47 and 57 to be fastened with a nut.)

Therefore, the fastening hole 47 of the first connecting piece 46 and the fastening hole 57 of the second connecting piece 56 are matched, and then the fixing bolts 58 are coupled into the fastening holes 47 and 57 to form a rail ( 51 is supported on the support body 42.

In addition, the rail 51 is equipped with a moving frame 53 for moving left and right by using one surface thereof as the guide surface 52, which is in contact with the guide surface 52 of the rail 51 at one side thereof. The roller 54 which can be moved smoothly while being mounted is mounted, and the other side has a structure in which a connecting ring 55 is provided to connect the horizontal rope 12b of the safety net.

In the present embodiment, the horizontal rope 12b, which is tied to the connecting ring 55 of both moving frames 53, is tightly supported, and a compression spring is provided at the center of the horizontal rope 12b so as to have a buffering force in case of a fall accident. 14 can be mounted.

In addition, the connecting ring 55 of the both sides of the moving frame 53 is equipped with an opening and closing adjustment strap 13 which is dually connected so as to fold and expand the safety net to perform the opening and closing of the safety net.

At this time, in order to fix the opening and closing adjustment strap 13 and the longitudinal side rope (12a) to the beam (1) of the steel structure, one side length is formed longer than the other length by a predetermined length, the hole is formed on the bottom of the long side The c-shaped clasp 59 is provided at the ends of the opening and closing adjustment strap 13 and the longitudinal side rope 12a to fix the c-shaped clasp 59 to the beam 1 of the steel structure.

The operation of the present invention configured as described above with reference to FIGS. 10 and 11 is as follows.

First, when the safety net is installed in a rectangular structure, a support body 42 is independently installed on both ends of each horizontal beam 1 constituting the structure, and at this time, a support body is formed on the thickness of one flange of the beam 1. 42, the c-width of the one side is fixed to each other, and the c-width of the main body 42 and the first clamp 43 are overlapped and inserted into the other flange portion of the beam 1, and the pressure screw 44 is inserted. Advance and tighten the first clamp 43 so that the beam 1 and the support body 42 are fixed.

In addition, the fastening hole 57 of the second connection piece 56 provided on one side of the rail 51 in the fastening hole 47 of the first connection piece 46 provided on one side of the support body 42. After fixing, fasten with fixing bolts 58, and fix the moving frame 53 in a state in which the horizontal rope 12b woven in the horizontal direction of the safety net is connected to the connecting ring 55 of the moving frame 53. It is fitted to the rail (51).

By doing so, the roller 54 provided in the moving frame 53 is moved back and forth in contact with the guide surface 52 of the rail 51 to expand and fold the safety net.

Here, the opening and closing adjustment strap 13 of one of the two layers is connected to the connecting ring 55 of the moving frame 53 respectively mounted on the horizontal rope 12b of the safety net, so that the unconnected adjustment strap is held. When pulled, the opening and closing adjustment strap 13 connected to the connecting ring 55 of the moving frame 53 is expanded by the force, and is expanded. On the contrary, when dismantling the safety net, it is connected to the connecting ring 55. By pulling the opening and closing adjustment strap 13, the roller 54 provided in the last moving frame 53 is moved and folded while being guided by the guide surface 52.

Fourth embodiment

A fourth embodiment of the present invention will be described with reference to FIGS. 12 to 14.

12 is a perspective view showing the configuration of the fourth embodiment of the safety net opening and closing device according to the present invention installed in the slab opening of the building, Figure 13 shows the configuration of the clamp fastened to the slab opening in the safety net opening and closing device according to the fourth embodiment 14 is a state diagram in which the safety net opening and closing device of the fourth embodiment is installed in the slab opening.

In the drawings, "61" is a slab, "62" is a support body, "63" is a fastening bolt, "64" is a fixing nut, "65" is a fixing plate, "65a" is a long hole, "66" is a first connecting piece, "67" represents a fastening hole and "68" represents a supporting rod, respectively.

The safety net opening and closing device of the fourth embodiment is mainly installed in the slab opening of each floor in order to elevate the building materials so that the safety net can be opened and closed from time to time. The support body 62 is shown fixedly supported at the edge of the opening of the slab 61 at the opening of the slab 61 of each layer.

Here, the support body 62 is formed in a c-shape to be independently spanned by the slab 61, the lower bolt portion of the support body 62 is mounted so that the fastening bolt 63 is penetrated through the slab (61). The fastening bolt 63 can be tightened and fixed in a state where it is fitted to the support body 62.

In addition, a predetermined number of support rods 68 may be provided at a predetermined position on the upper surface of the slab 61 forming the openings of the respective layers, and the support rods 68 may be formed when concrete is poured. After installing the support rod 68 in advance, the concrete is poured to endure the vertical load received when a load is applied to the safety net, and after dismantling the safety net switchgear, the support rod 68 protrudes from the upper surface of the slab 61. After going through the process of cutting the hem of the) hole made in the slab 61 by the support rod 68 is to fill the concrete.

In addition, at least one long hole 65a is formed to fit the fixing nut 64 provided on the upper surface of the supporting member 62, and a fixing plate 65 having a slot formed at the other side thereof so that the supporting rod 68 is fitted. Is fitted. Therefore, the fixing plate 65 fitted to the support rod 68 is more firmly fixed to prevent the support body 62 from being separated from the slab 61. In addition, a first connecting piece 66 having a predetermined size is installed on one side of the supporting member 62, and a rail 51 is provided at one side of the first connecting piece 66 in the longitudinal direction of the slab 61. On both side surfaces of the rail 51, a second connecting piece 56 having a fastening hole 57 corresponding to the fastening hole 67 of the first connecting piece 66 is installed on the rail 51 by welding or the like. Female threads are formed inside the holes 57 and 67. (Alternatively, the bolt may be penetrated into the fastening holes 57 and 67 to be fastened with a nut.)

Accordingly, the fastening holes 67 of the first connecting piece 66 and the fastening holes 57 of the second connecting piece 56 are matched to each other, and then the fixing bolts 58 are coupled into the fastening holes 57 and 67. 51 is supported on the support body 62.

The rail 51 is equipped with a plurality of moving frame 53 having a connecting ring 55 is connected to the horizontal rope 12b of the safety net, both sides of the guide surface 52 on the inner side of the moving frame 53 A roller 54 is mounted which can move smoothly while in contact.

In the present embodiment, the horizontal rope 12b, which is tied to the connecting ring 55 of both moving frames 53, is tightly supported, and the compression spring 14 is provided at the center of the rope 12b so as to have a cushioning force in case of a fall accident. ) Can be mounted.

In addition, the connecting ring 55 of the both sides of the moving frame 53 is equipped with an opening and closing adjustment strap 13 which is dually connected so as to fold and expand the safety net to perform the opening and closing of the safety net.

At this time, in order to fix the opening and closing adjustment strap 13 and the longitudinal side rope (12a) to the slab, etc., one side length is formed longer than the other length by a predetermined length, the c-shaped latch 59 formed a hole in the bottom of the long side Is provided at the ends of the opening and closing adjustment strap 13 and the longitudinal side rope (12a) to secure the c-shaped clasp (59) to the slab or the like.

Referring to Figure 14 the operation of the present invention configured as described above are as follows.

When the safety net is to be installed in the rectangular opening through which an elevator or the like passes, firstly, a support body 62 is independently installed on one side of the slab 61 constituting the structure, and at this time, the support body is installed on the slab 61. The c-width of 62) is fixed and the fastening bolt 63 is advanced so that the supporting member 62 is fixed to the slab 61.

In addition, the upper surface of the slab 61 is formed with a fixing plate 65 having a long hole (65a) is coupled to the fixing nut 64 formed on the upper surface of the support body 62, the fixing plate 65 is a slab It is connected to the support rod 68 fixed at a predetermined position on the upper side of the 61 to more firmly fix the support body 62, the rail 51 on the first connecting piece 66 provided on one side of the support body 62 Insert the second connecting piece 56 provided on one side of the), and tightened with a fixing bolt 58 to fix to the support body 62, the rope 12b woven in the transverse direction of the safety net moving frame ( 53 is installed in the rail 51 in the state connected to the connecting ring (55).

Here, the opening and closing adjustment strap 13 of one of the two layers is connected to the connecting ring 55 of the moving frame 53 respectively mounted on the horizontal rope 12b of the safety net, so that the unconnected adjustment strap is held. When pulled, the opening and closing adjustment strap 13 connected to the connecting ring 55 of the moving frame 53 is expanded by the force, and is expanded. On the contrary, when dismantling the safety net, it is connected to the connecting ring 55. By pulling the opening and closing adjustment strap 13 is to be folded to move while receiving the guide of the rail 51 from the roller 54 provided in the last moving frame 53.

The present invention described above is not limited to the above-described embodiments and drawings, and various permutations, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

As described above, according to the present invention, when the steel structure of the building, factory, etc. is expanded, the tower crane is mounted on the lifting part of the building material to quickly and easily install and dismantle the safety net according to the lifting of the building material. Has the effect of performing.

Claims (18)

Guide means installed longitudinally on the support structure of each layer; A plurality of moving means coupled to the respective guide means to move in the front and rear directions; A first connection member connecting the moving means coupled to the one guide means and the moving means coupled to the other guide means and having a safety net attached thereto; And a second connection member connecting the plurality of moving means coupled to each of the guide means with each other to move the moving means back and forth. The method of claim 1, wherein the guide means comprises a cylindrical member; Safety net opening and closing device including a moving frame of the predetermined size and the moving means is inserted into the cylindrical member and supported in the moving frame and the pulley in contact with the circumferential surface of the cylindrical member. The method of claim 1, wherein the guide means comprises a rail member; Safety net opening and closing device including a moving frame of the predetermined size and the moving means is fitted to the rail member and the roller installed in the moving frame and in contact with the guide surface of the rail member. Clamping means mounted to the support structure of each layer; Guide means mounted in the longitudinal direction to the clamping means; Fixing means for coupling the clamping means and the guide means; A plurality of moving means coupled to the respective guide means to move in the front and rear directions; A first connection member connecting the moving means coupled to the one guide means and the moving means coupled to the other guide means and having a safety net attached thereto; And means for weaving orthogonal to the first connection member and providing forward and backward movement force to the moving means. The safety net opening and closing device according to claim 4, wherein the clamping means receives and fixes the flanges of the horizontal beams on both sides of the support structure of each layer, and has one width smaller than the other width by a predetermined size. A clamp according to any one of claims 4 to 5, further comprising: a first clamp received at one side width of the clamping means and supporting the flange portion of one horizontal beam of the support structure; And means for penetrating one end of the clamping means and forcing the first clamp to fix the flange portion of one horizontal beam of the support structure. The method of claim 4, wherein the clamping means comprises: a support body fitted to the slab and a protrusion provided on the upper portion of the support body; Safety net opening and closing device installed on the lower end of the main support body including a fastening bolt for fastening the main support to the slab. According to claim 4 or 5, wherein the guide means comprises a cylindrical member, a moving frame of a predetermined size to be supported by the moving means is inserted into the cylindrical member, and installed inside the moving frame of the cylindrical member Safety net opening and closing device including a pulley in contact with the circumferential surface. 8. A method according to any one of claims 4, 5 and 7, wherein said guide means comprises a rail member; Safety net opening and closing device including a moving frame of the predetermined size and the moving means is fitted to the rail member and the roller installed in the moving frame and in contact with the guide surface of the rail member. According to claim 4 or 5, wherein the fixing means is mounted on the upper side of the clamp means, the upper portion is formed in a circular ring so that the guide means are fitted, through the side of the circular ring to press the guide means Safety net opening and closing device including a fixing screw for fixing. According to any one of claims 4, 5 and 7, wherein the fixing means is mounted to protrude on one side of the clamp means, the first connection piece formed with a fastening hole; A second connection piece mounted on one side of the guide means at a portion corresponding to the first connection piece and having a fastening hole; And means for fastening to the fastening hole of the first connecting piece and the fastening hole of the second connecting piece. 8. The safety net opening and closing device according to any one of claims 4, 5 and 7, wherein the first connection member includes a rope. The safety net opening and closing device according to claim 12, further comprising a compression spring so as to have a buffering force in the case of a fall accident in the central portion of the first connection member. The safety net opening and closing device according to claim 12, wherein one side is connected to an end of one of the first connecting members, and the other side includes a latch that hangs over the support structure. The method of claim 4, 5 or 7, wherein the moving force providing means comprises two rows of second connecting members, one of which connects a plurality of moving means to each other, Safety net opening and closing device that is moved left and right by pulling the unconnected state. According to any one of claims 4, 5 or 7, wherein the moving force providing means are provided on both sides of the horizontal beam facing each other, the electric winch for forward and reverse rotation drive; A second end of which one end is connected to the movement means of one end and the other end of the movement means, the other end of which is connected to both winches, wound and unwound on the winch, and transferring the plurality of movement means to the left and right; Connecting member; And a feed roller mounted on upper surfaces of both ends of the opposing horizontal beams to guide the transfer of the second connection member. The safety net opening and closing device according to claim 9, wherein a connecting ring is attached to the moving frame and a first connecting member is connected to the connecting ring. According to any one of claims 4, 5 or 7, wherein one side of the slot is formed so as to span the support rod is fixed to the slab, the other side is further provided with a fixing plate formed with a hole hole so that the projection of the main body is fitted Safety net switchgear included. ※ Note: The disclosure is based on the initial application.