KR100253169B1 - Apparatus for opening and closing a safty net - Google Patents

Abstract

PURPOSE: A device for unfolding and folding a safety screen is provided to easily install a safety screen in a steel frame structure by installing a support and to easily fold the safety screen. CONSTITUTION: Main supports(2) are independently installed at both ends of horizontal beams composing a steel frame structure by fitting one side of a staple-shaped main support to one part of a flange of a beam and inserting a first clamp(3) inserted t the other side of the main support into the other part of the flange. The first clamp is fastened by moving a pressurizing screw(4) forwardly, and the main support is stably fixed on the beam. A guide bar(6) is inserted into a second clamp(5) formed at an upper portion of the main support and fastened by a fixing screw(7). A horizontal side rope(12b) of a safety screen is connected with a connecting ring(9) of a moving frame(8). The safety screen is folded and unfolded via a pulley(10) moving forwardly and backwardly in contact with the circumference of the guide bar. As one of folding and unfolding ropes is connected with the connecting ring, the safety screen is unfolded by the movement of the folding and unfolding rope upon pulling the other rope.

Description

Safety net switchgear

The present invention relates to a safety net opening and closing device installed on a steel structure to prevent safety accidents due to falling objects or workers at the construction site, in particular, the safety net can be unfolded uniformly by pulling the opening and closing adjustment straps 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 may be fixed to the safety net of the present invention to the safety net of the present invention in a mesh of a predetermined mesh (mesh), and can be produced by weaving a reinforcing rope according to the drop load at predetermined intervals in the horizontal and vertical directions, wherein The horizontal and vertical rope spacing is to be set at intervals of 2 to 3M to prevent the worker from falling.

In the installation of the safety net manufactured as described above, in the related art, as shown in FIG. 1, the ropes are installed to tie the beams to the beams of the steel structure to cover the space of each layer, and the safety net is the beam or the truss. It is generally installed to be located at the lower end to prevent the worker from tripping over the net during transportation.

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 view showing a state in which a safety net is mounted on a common 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.

Figure 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.

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

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

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

Figure 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 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 where the safety net opening and closing device according to the third embodiment is mounted on a steel frame structure.

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

Figure 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 apparatus according to the fourth embodiment.

Figure 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 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 pair of guide means installed to face the support structure of each layer; A plurality of moving means mounted on the respective guide means so as to be movable in the front and rear directions; Both ends are respectively connected to the moving means mounted on the one guide means and the moving means mounted on the other guide means, each of which is equipped with a spring for absorbing the impact of the vertical load, A plurality of ropes woven into the safety net; And it provides a safety net opening and closing device comprising a plurality of connecting members for moving the moving means back and forth by connecting a plurality of moving means coupled to each guide means to each other.

In addition, the present invention includes a plurality of clapping means fixed to both sides of the support structure of each layer; A pair of guide means coupled to the clapping means on both sides; A plurality of fixing means for coupling the clamping means and the guide means; A plurality of moving means mounted on the respective guide means so as to be movable in the front and rear directions; Both ends are respectively connected to the moving means mounted on the one guide means and the moving means mounted on the other guide means, each of which is equipped with a spring for absorbing the impact of the vertical load, Multiple ropes against safety nets; And it provides a safety net opening and closing device comprising a means for providing a back and forth 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 Figure 5 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, 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 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 the frame, "9" is the hook, "10" is the pulley, "11" is the bat, "12a" is the longitudinal rope, "12b" is the horizontal rope, "13" is the opening and 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, as shown in Figure 2, the plan of each horizontal beam (1) to form a steel frame structure of the rectangular shape A support body 2 is provided which is supported on the branch independently.

Here, as shown in Fig. 3, both ends of the supporting member 2 are formed in a “c” shape, and the width between the upper and lower wall surfaces of one side of the supporting member 2 can be fitted with a flange portion of the beam. It is formed to such an extent that the width between the upper and lower wall surfaces of the other side is formed to be larger than the flange thickness of the beam 1 by a predetermined size. Therefore, when the supporting member 2 is provided in the beam 1, one end of the flange portion of the beam 1 is inserted and supported inside one side of the supporting member 2, and the other side of the supporting member 2 is supported. The other end of the flange portion of the beam 1 is to be accommodated easily.

In addition, a first clamp 3 having a “c” shape is fitted into and fixed to the inside of the other side of the supporting member 2, and the other end of the flange part is inserted into the first clamp 3.

At this time, the pressing screw 4 penetrates the side and bottom of the other side of the supporting member 2, and the pressing screw 4 presses the side and bottom of the first clamp 3 so as to press the beam (1). ) So that the flange portion of the c) is stably supported inside the support body 2.

A second clamp 5 having a circular ring is mounted on the upper surface of the supporting member 2, and a guide rod 6 having a predetermined length is fitted into the ring of the second clamp 5. In this case, the fixing screw 7 is inserted through one side of the ring of the second clamp 5 so as to press and fix the guide rod 6.

In addition, in the present embodiment, as shown in Figure 4, the movable frame 8 for supporting the guide rod 6 is provided, the outer side of the movable frame 8, the horizontal rope 12b of the safety net Is provided with a connecting ring 9 is connected. In addition, the inside of the moving frame (8) is equipped with a pulley (10) for rolling while contacting the circumferential surface of the guide rod (6).

On the other hand, the rope 11 of the safety net made of the predetermined net can be woven in the horizontal, longitudinal direction 12, the longitudinal side rope 12a is provided to be detachable to the beam (1), the horizontal side The rope 12b is fixed to the connecting ring 9 provided in the plurality of moving frames 8 so that the safety net is supported by the connecting ring. In this embodiment, the horizontal rope (12b) tied to the connecting ring (9) of both the moving frame (8) is tightly supported, the compression spring in the center of the horizontal rope (12b) to have a buffering force in 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 Figures 5 and 6 the operation according to the first embodiment of the present invention configured as described above is as follows.

First, the supporting members 2 are independently provided at both ends of the horizontal beams 1 constituting the steel structure. That is, one side of the support body 2 having a "c" shape is fitted and fixed to one side of the flange portion of the beam 1, and the other side of the support body 2 to the other side of the flange portion of the beam 1. The first clamp 3 is inserted into and supported, and the supporting body 2 is stably fixed to the beam 1 by advancing the pressure screw 4 and tightening the first clamp 3.

In addition, the guide rod (6) is inserted into the second clamp (5) provided on the top of the supporting member (2), the guide rod (6) is fixed by tightening the fixing screw (7), the horizontal of the safety net The horizontal rope 12b woven in the direction is connected to the connecting ring (9) of the moving 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.

That is, one of the two opening and closing adjustment strap 13 is connected to the connecting ring 9 of the moving frame 8 mounted on the horizontal rope 12b of the safety net, so as to hold the unconnected adjustment strap. 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. As the opening and closing adjustment strap 13 is pulled in the opposite direction as described above, it is folded and moved by receiving the guide rod 6 from the pulley 10 provided at 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 opening and closing device 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". Is a second power switch, "35" is a transfer roll, "36" is a transfer 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 pair of feed rollers 35 mounted on the top edges of the rectangular beams 1 to guide the feed ropes 36, respectively.

Here, each of the first and second winch (31, 32) is provided with a double drum formed 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 through the conveying roller 35 ( 8 ") to the connecting ring 9".

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.

Accordingly, when installing the folded safety net, first, the second winch 32 is driven by turning on the second power switch 34, and drawn out to the inner and outer drums 32a and 32b thereof. As the transport rope 36 is wound, the connecting ring 9 "of the far end moving frame 8" is pulled. At this time, the moving frame 8 "is connected at a predetermined interval 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 foremost moving 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 conveying 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 fold the safety net sequentially 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 guide 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.

Figure 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, Figure 10 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 according to the third embodiment 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 a fixed bolt," 59 "is a" c "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. As shown in FIGS. 8 and 9, first, the support body 42 having the same configuration as the first embodiment is shown. ) And a first clamp 43 is 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 connecting 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 (or bolts inside the fastening holes 47 and 57). It can also be screwed in 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 coincide with each other, 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, while in contact with the guide surface 52 of the rail 51 at one side of the moving frame 53. The roller 54 for smoothly moving the moving frame 53 is mounted, and the other side is provided with a connecting ring 55 for fixing the horizontal rope 12b of the safety net.

In this embodiment, the horizontal rope (12b) is tied to the connecting ring 55 of both the moving frame (53) to be tightly supported, the compression spring in the center of the horizontal rope (12b) to have a cushioning force in the event 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 A "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.

Referring to Figures 10 and 11 the operation of the present invention configured as described above are as follows.

First, the support body 42 is independently installed on both ends of each of the horizontal beams 1 constituting the structure, and one side of the support body 42 having a "c" shape on one side of the flange portion of the beam 1. To the other side of the flange portion of the beam (1) by inserting the first clamp (43), which is fitted to the other side of the support body 42 and fixed, and then advances the pressure screw 44 to the first clamp (43) The flange of the beam 1 is tightened by

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, tighten and fasten with a fixing bolt (58), the rail (53) in the state in which the horizontal rope (12b) woven on the safety net connected to the connecting ring (55) of the movable frame (53) 51) and install it.

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, since 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 mounted on the horizontal rope 12b, respectively, when pulling the unconnected adjustment strap, Opening and closing adjustment straps 13 connected to the connecting ring 55 of the moving frame 53 by the force is to be expanded while moving, on the contrary, when dismantled by folding the safety net is connected to the connecting ring 55 In accordance with 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 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 a 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 around the opening of the slab 61.

Here, the supporting member 62 is formed in a "c" shape so as to be independent of the slab 61, and the fastening bolt 63 is mounted to the bottom of the supporting member 62 so that the slab passes through the slab. The tightening bolt 63 can be tightened and fixed in the state where 61 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 to form an opening in each layer, and the support rods 68 may be used when concrete is poured. It is installed to withstand the vertical load received when a load is applied to the safety net, and after dismantling the safety net switchgear, after cutting the hem of the support rod 68 protruding to the upper surface of the slab 61, the support rod Holes formed in the slab 61 by 68 is to fill the concrete.

In addition, a fixing plate 65 is mounted on an upper surface of the supporting member 62, and the fixing plate 65 is fitted with at least one long hole 65a for inserting the fixing nut 64 and the supporting rod 68. Slots are formed. Therefore, the fixing plate 65 in which the support rod 68 is fitted secures the support body 62 more firmly, thereby preventing 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. Second connecting pieces 56 having fastening holes 57 corresponding to the fastening holes 67 of the first connecting pieces 66 are installed on the side surfaces of both ends of the rail 51 by welding or the like, and the fastening holes 57, A female screw is formed inside the 67 (or a bolt may be inserted into the fastening holes 57 and 67 to be fastened with a nut).

Therefore, after the fastening hole 67 of the first connecting piece 66 and the fastening hole 57 of the second connecting piece 56 coincide with each other, the fixing bolts 58 are coupled into the fastening holes 57 and 67. The rail 51 is supported by the supporting member 62.

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

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 buffering force during a crash. ) 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, one side length is formed longer than the other length by a predetermined length to secure the opening and closing adjustment strap 13 and the longitudinal side rope (12a), such as the slab, the "c" shaped clasp formed with a hole in the bottom of the long side ( 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 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 main body 62 is independently installed on one side of the slab 61 constituting the structure, in which case the “c” is formed on the slab 61. The main support body 62 having a magnetic shape is inserted and fixed, and the tightening bolt 63 is advanced to fix the main support body 62 to the slab 61.

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

Here, since 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 mounted on the horizontal rope 12b, respectively, when pulling the unconnected adjustment strap, Opening and closing adjustment strap 13 connected to the connecting ring 55 of the moving frame 53 by the force is to be expanded while moving, on the contrary, when dismantling the safety net is connected to the connecting ring 55 opening and closing As the adjustment strap 13 is pulled, it is moved and folded while being guided by 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 challenges, 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, the present invention has a simple configuration and is easy to install and dismantle. When the steel structure is expanded, such as a building or a factory, the tower crane is installed at a place where the building materials are elevated, and the safety net is installed according to the elevation of the building materials. And dismantling can be performed quickly and manually simply and semi-automatically.

Claims (15)

A pair of guide means installed opposite the support structure of each layer; A plurality of moving means mounted on the respective guide means so as to be movable in the front and rear directions; Both ends are respectively connected to the moving means mounted on the one guide means and the moving means mounted on the other guide means, each of which is equipped with a spring for absorbing the impact of the vertical load, A plurality of ropes woven into the safety net; And a plurality of connection members for connecting the plurality of moving means coupled to each of the guide means to move the moving means back and forth. The method of claim 1, wherein the guide means comprises a cylindrical rod; The moving means is supported to be movable on the cylindrical rod, and one side thereof is provided with a connecting ring for fixing one end of the safety net, and inside thereof is provided with a pulley for rolling in contact with the circumferential surface of the cylindrical rod. Safety net opening and closing device comprising a plurality of movable frame. The method of claim 1, wherein the guide means comprises a rail member; The moving means is supported so as to be movable on the rail member, one side thereof is provided with a connecting ring for fixing the end of the safety net, the inside has a plurality of rollers that make rolling movement in contact with the guide surface of the rail member Safety net switchgear including a moving frame of the. A plurality of clamping means fixed to both sides of the support structure of each layer; A pair of guide means coupled to the clamping means on both sides; A plurality of fixing means for coupling the clamping means and the guide means; A plurality of moving means mounted on the respective guide means so as to be movable in the front and rear directions; Both ends are respectively connected to the moving means mounted on the one guide means and the moving means mounted on the other guide means, each of which is equipped with a spring for absorbing the impact of the vertical load, Multiple ropes against safety nets; And means for providing a back and forth movement force to the moving means. 5. The safety net opening and closing device according to claim 4, wherein the clamping means is configured to receive and secure the flange portions of the horizontal beams on both sides of the supporting structure of each layer. According to claim 4 or 5, The first clamp is received on one side of the clamping means, the clamp for supporting one side of the flange portion of the support structure; And means for penetrating one end side of the clamping means and forcing the first clamp to fix a flange portion of one horizontal beam of the support structure. According to claim 4, The clamping means, The projection is provided on the upper side, the support body fitted to the slab; And a tightening bolt installed on a lower end of the supporting member to press the slab to fix the supporting member to the slab. According to claim 4 or 5, wherein the guide means comprises a cylindrical rod, the moving means is supported to be movable on the cylindrical rod, therein the rolling motion in contact with the circumferential surface of the cylindrical rod Safety net opening and closing device including a plurality of moving frame having a pulley. 8. A method according to any one of claims 4, 5 and 7, wherein the guide means comprises a rail member; The moving means is supported so as to be movable on the rail member, the safety net opening and closing device including a plurality of moving frame to move in contact with the guide surface of the rail member therein. According to claim 4 or 5, The fixing means, The clamping means is mounted on the upper side, the upper portion of the ring-shaped member that can be mounted through the guide means; And a fixing screw penetrating to the side of the ring to press and fix the guide means penetrated to the member. According to any one of claims 4, 5 and 7, The fixing means, The first connection piece is mounted to protrude on one side of the clamping means, the fastening hole is formed; And a second connection piece mounted on one side of the guide unit so as to correspond to the first connection piece and having a fastening hole having a diameter substantially the same as that of the first connection piece. And means fastened to the fastening hole of the first connection piece and the fastening hole of the second connection piece. The method of any one of claims 4, 5 or 7, wherein the moving force providing means comprises two rows of connecting members, one of the connecting members connecting a plurality of moving means to each other. A safety net opening and closing device for allowing a plurality of moving means connected by one of the connecting members to be moved on the guide means by pulling the other one of the members in an unconnected state. According to any one of claims 4, 5 and 7, wherein the moving force providing means is provided on both sides of the horizontal beam facing each other, a plurality of electric winch for forward and reverse rotation drive; One end of each of the plurality of moving means mounted on one side of the horizontal beam and one end of the plurality of moving means mounted on the other side of the horizontal beam is connected to one end thereof, respectively to the winch A plurality of connecting members whose other ends are connected and wound to the winch and unwound to convey the plurality of moving means; And a plurality of feed rollers respectively mounted on upper surfaces of both ends of the opposing horizontal beams to guide the transfer of the connecting member. The safety net opening and closing device of claim 9, wherein a connection ring is fixed to the moving frame, and one end of the safety net is connected to the connection ring. 8. The safety net opening and closing device according to claim 7, wherein the clamping means further includes a slot formed on one side thereof so as to span a support rod inserted into and fixed to the slab, and the other side includes a fixing plate having a hole hole into which the projection of the main body is inserted. .

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