JP5419748B2 - Safety net clamp and safety net extension method using this clamp - Google Patents

Description

  The present invention relates to a safety net clamp that is used to stretch a safety net that protects an operator who has accidentally fallen from a high place, and in particular, a safety net can be stretched by a worker remotely from a low place. It relates to a clamp for performing. Further, the present invention relates to a safety net extending method using this clamp.

  For example, when working on high places such as roof remodeling work or repair work on a station platform, a safety net is installed on the ceiling before starting the work. As a result, even if an operator or the like is accidentally dropped at the construction site, the safety net is protected and the safety of the operator or the like is ensured. This type of safety net is known from Patent Documents 1 and 2, for example.

  And when tension | tightening a safety net, the net tension | tensile_strength metal fixture or clamp well-known to patent document 3, 4 etc. is used. These clamps are configured such that a locking hook for locking the safety net is provided on a metal fitting body fixed to a structure on which the safety net is to be stretched.

JP 2006-230443 A JP 2009-112511 A Japanese Patent Laid-Open No. 11-100998 JP 2006-336372 A

  However, when a safety net clamp known from Patent Documents 3 and 4 is used, a work scaffold is assembled up to a high place where the clamp is fixed, and an operator fixes the clamp manually on the work scaffold. The safety net had to be stretched by hooking the end rope of the safety net on the locking hook.

  For example, when a safety net is stretched at the tip of the roof (railway side) when performing roof remodeling work or repair work on a station platform such as a railway, as shown in FIG. A beam 6 is provided at the tip of a transverse beam 5 that extends just under 2 to near the eaves 3 and a safety net clamp is attached to this beam 6 (generally, lightweight shaped steel, grooved steel, H-shaped steel, etc. are used). In order to protect passengers and the like on the platform 1 from rain and wind, the beam 6 often protrudes toward the track 7 from the tip of the platform 1. Therefore, after a work scaffold is assembled on the track 7 Net installation work must be done.

  Since the height from the track 7 to the beam 6 is as much as 5 to 7 m, the working scaffold must be set up so much. Assembling a high work scaffold not only increased costs but also decreased work efficiency.

  In addition, the worker may crash from the work scaffold, which is a big problem from the viewpoint of safety.

  Therefore, the problem to be solved by the present invention is to provide a novel configuration that enables a safety net installation work at a high place by a remote operation of an operator from a low place without the need to form a high work scaffold. To provide a safety net clamp provided, and to provide a safety net stretching method using the clamp.

  In order to solve this problem, the present invention according to claim 1 is a safety net clamp that is used by being fixed to a structure in order to stretch a safety net that protects an operator accidentally dropped from a high place. The vertical portion, the horizontal portion extending in one direction from the upper end of the vertical portion, the safety net end rope locking hook provided on the back of the vertical portion, and the main body connected to the lower end of the vertical portion The main body portion includes a cam that can be projected and retracted from the main body portion, a gripping state in which the cam is urged upward in a direction to protrude upward from the main body portion, and an open state in which the cam portion is embedded and accommodated in the main body portion. The cam having a switching means to be held on one side and a connecting rod fixed so as to extend downward from the main body, and in a gripping state with the horizontal portion while the vertical portion is in contact with a side surface of the structure By grasping the structure between Is configured to secure the creation, in the switching means is capable of connecting the cam switching operation rod, characterized in that the connecting rod can be coupled a clamp operating rod.

  According to a second aspect of the present invention, in the safety net clamp according to the first aspect of the present invention, a disengagement prevention portion that protrudes from the front end of the horizontal portion is provided, and the front end of the building portion is locked when fixed to a building. It is characterized by fulfilling the detachment preventing action.

  According to a third aspect of the present invention, in the safety net clamp according to the first or second aspect, the cam includes a link mechanism including at least two link arms and a link pin that rotatably connects the link arms. The switching means is provided with an operating lever having an upper end connected to the link pin and hanging downward.

  According to a fourth aspect of the present invention, in the safety net clamp according to the third aspect, a horizontal bar is provided at a lower end of the operation lever.

  According to a fifth aspect of the present invention, in the safety net clamp according to the third or fourth aspect, a movement restricting means for restricting movement of the operation lever is provided in the main body.

  According to a sixth aspect of the present invention, in the safety net clamp according to any one of the third to fifth aspects, when the clamp is attached to a structure, the operation lever is pushed up to switch the cam from an open state to a gripping state. When removing the clamp from the structure, the operation lever is pulled down to switch the cam from a gripping state to an open state.

  According to a seventh aspect of the present invention, in the safety net clamp according to the fourth aspect of the invention, the cam switching operation bar is provided with a metal fitting provided with a wave-shaped locking piece at the end of a long bar. When the clamp is attached to the structure, the operating bar is raised by pushing the horizontal bar against the bottom of the inverted triangular portion of the wave-shaped locking piece to switch the cam from the open state to the gripping state, When removing the clamp from the structure, the operation lever is lowered by applying and pulling down the horizontal bar to the top of the triangular portion of the wave-shaped locking piece to switch the cam from the gripping state to the open state. And

  According to an eighth aspect of the present invention, in the safety net clamp according to any one of the first to seventh aspects, the clamp operating bar is a bracket for mounting the connecting bar non-rotatably at the tip of a long bar. Is attached.

  According to a ninth aspect of the present invention, in the safety net clamp according to the eighth aspect, the connecting rod has a polygonal cross-sectional shape, and the clamp operating rod has an accommodating portion corresponding to the cross-sectional shape of the connecting rod. It is characterized by that.

  According to a tenth aspect of the present invention, in the safety net clamp according to the ninth aspect, an inlet guide for guiding the connecting rod to the accommodating portion is provided at a tip of the clamp operating rod fitting. And

  According to an eleventh aspect of the present invention, in the safety net clamp according to the tenth aspect, the inlet guide has an inverted quadrangular pyramid shape or an inverted conical shape.

  According to a twelfth aspect of the present invention, in the safety net clamp according to any one of the first to eleventh aspects, the cam switching operation bar and the clamp operation bar are both extendable and have a maximum length when extended. It is 5 to 7 m.

  According to a thirteenth aspect of the present invention, in the safety net clamp according to any one of the first to twelfth aspects, the vertical portion is fastened in a state where the first vertical portion and the second vertical portion are overlapped. It comprises an upper member having a first vertical portion, the horizontal portion and the hook, and a lower member having a second vertical portion and the main body portion.

  According to a fourteenth aspect of the present invention, in the safety net clamp according to the thirteenth aspect, a mounting hole that is paired in the width direction is formed in at least one of the first vertical portion and the second vertical portion in the height direction. It is formed in multiple stages, and can be attached to structures of different sizes by fastening using any combination of these multiple stages of mounting hole pairs.

  According to a fifteenth aspect of the present invention, in the safety net clamp according to the fourteenth aspect, one mounting hole in the width direction of the pair of mounting holes in each step is formed as a circular hole through which a bolt for fastening is inserted, and the width direction The other mounting hole is formed as a substantially semicircular hole in which the circular hole is substantially bisected in the width direction, and the substantially semicircular hole-shaped mounting hole is continuous by a sliding groove extending in the height direction, The clamp height can be adjusted without separating the upper member and the lower member.

  According to a sixteenth aspect of the present invention, in the safety net clamp according to any one of the first to fifteenth aspects, a twill-like or parallel groove-like tooth is formed at the tip of the cam. .

  The present invention according to claim 17 is the safety net clamp according to any one of claims 1 to 16, wherein the safety net end rope locking hook is formed by bending a round bar spirally 360 degrees or more. It is characterized by that.

  The present invention according to claim 18 is a safety net extending method using the safety net clamp according to any one of claims 1 to 17, wherein the clamp is attached by the clamp operating rod connected to the connecting rod. The clamp is set so that the structure is accommodated between the horizontal portion and the open cam, and the operation lever is pushed up by the cam switching operation rod in this state. After switching the cam from the open state to the gripping state and fixing the clamp to the structure, the clamp operation rod and the cam switching operation rod are removed, and the end rope of the safety net is used for locking the end rope of the safety net It is characterized in that a safety net is stretched by engaging with a hook.

  ADVANTAGE OF THE INVENTION According to this invention, when performing a high place work, there exists an effect which can perform efficiently the operation | work which stretches a safety net on a ceiling etc. in order to ensure a worker's safety.

  In the case of high place work such as roof remodeling work or repair work of a station platform, the beam to which the safety net clamp is to be attached often protrudes from the platform to the track side. Even in such a case, the present invention According to the above, the operator can attach the clamp to the beam using the clamp operation rod and the cam switching operation rod from the top of the platform, and further, the safety net can be stretched using the attached clamp.

  Thus, according to the present invention, the work of attaching a clamp to a structure such as a beam in a high place, the work of stretching a safety net, and the work of removing the clamp from the structure after completion of the work of stretching the safety net Both can be executed by remote control by an operator from a low place such as on a home.

  Therefore, it is not necessary to assemble a high scaffold as conventionally required, and it is possible to prevent the operator from falling down and to greatly improve the work efficiency.

It is a side view which shows the state for which the clamp for safety nets by one Embodiment (Example 1) of this invention was attached to the beam which consists of a lightweight section steel. It is a front view of the said attachment state. It is a perspective perspective view of the said attachment state. They are the side view (a) which shows the hook used for this safety net clamp alone, a front view (b), and a perspective view (c). FIG. 4 is a side view (a) and a front view (b) of a lock (gripping) state of a cam-related mechanism portion in the safety net clamp. It is the open state side view (a) and front view (b) of the cam related mechanism part in this safety net clamp. It is a side view which shows the state for which the clamp for safety nets by other embodiment (Example 2) of this invention was attached to the beam which consists of small size channel steel. It is a front view of the said attachment state. It is a perspective perspective view of the said attachment state. It is the side view (a) and front view (b) of the upper member used for this safety net clamp. It is a side view shown in the state where this safety net clamp was attached to the beam which consists of large size channel steel. It is a front view of the said attachment state. It is a perspective perspective view of the said attachment state. It is an operation process figure when attaching the clamp for safety nets to a beam by remote control. It is an operation process figure when removing the clamp for safety nets attached to the beam by remote control. FIG. 4 is a shortened state perspective view (a) and an extended state perspective view (b) of an operating rod used for attaching / detaching a safety net clamp by remote operation. It is the front view (a) and perspective view (b) of the front-end | tip metal fitting of the operation stick | rod of FIG. FIG. 7 is a shortened state perspective view (a) and an extended state perspective view (b) of an operating rod used for switching between a cam open state / locked (gripping) state of a safety net clamp by remote operation. It is the front view (a) and perspective view (b) of the front-end | tip metal fitting of the operation stick | rod of FIG. It is sectional drawing which illustrates the structure of the station platform which is an example of the work place where safety net extension is performed. It is sectional drawing which shows the operation | work point of the attachment / detachment of the clamp for safety nets by remote control from on the station platform of FIG. It is a state diagram which shows the safety net installation work by remote control. It is a figure which shows the state by which the safety net was stretched by the operation | work of FIG.

  Specific embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, the present invention is not limited to these specific embodiments, and various embodiments are within the scope of the invention described in the claims. Needless to say, variations and modifications are allowed.

  1 to 3, a safety net clamp (hereinafter simply referred to as “clamp”) 10 according to an embodiment of the present invention is attached to a beam 6 (FIG. 20) of a station platform made of a lightweight section steel. Shown in state.

  The clamp 10 according to this embodiment is composed of two members, a lower member 20 and an upper member 40.

  The lower member 20 includes a vertical plate 21 extending substantially close to the side surface 6b of the beam 6 and extending to the vicinity of the upper surface 6a, and a pair of main body plates 22 and 22 fixed to the lower end of the vertical plate 21 in the illustrated mounting state. A cam 23 is provided between the main body plates 22 and 22 so as to be able to protrude from the upper end 22a.

  The cam 23 is rotatable about a cam pin 24 installed between the pair of main body plates 22 and 22 as a rotation shaft, but is urged to rotate in a direction protruding from the upper end 22a of the main body plate by a spring 36 wound around the cam pin 24. ing.

  At the tip of the cam 23, a tooth 23a suitable for gripping the lower surface 6c of the beam 6 is provided. In the illustrated embodiment, the cam teeth 23a have a twill shape (knurl shape), but parallel teeth may be used.

  The cam 23 is rotatably connected to one end of the link arms 26 and 26 via a free link pin 25 at the lower end, and the other end of the link arms 26 and 26 is one end of the link arm 28 via a free link pin 27. Is pivotally connected to the motor. The other end of the link arm 28 is rotatably connected to a fixed link pin 29 installed between the pair of main body plates 22 and 22.

  Further, the operation lever 30 is provided in a state of vertically hanging by being pivotably connected to the free link pin 27 at its upper end, and its lower end extends below the main body plates 22, 22. A horizontal bar 31 is provided.

  On both sides of the operation lever 30, a pair of spring pins 32 and 33 are installed between the pair of main body plates 22 and 22, respectively. As will be described later, the spring pin 32 serves as a stopper for maintaining the cam 23 in the unlocked (opened) state, and the spring pin 33 is used to attach the clamp 10 in the cam unlocked (opened) state to the beam 6. It functions as a stopper for preventing the operating lever 30 from swinging like a pendulum.

  The connecting rod 37 is fixed to one outer side of the main body plates 22 and 22 by welding or the like, and is inclined and extended so as to be separated in the front direction as it goes downward. The connecting rod 37 of this embodiment is a steel material having a hexagonal cross section.

  The vertical plate 21 is formed with a pair of left and right mounting holes 34a and 34b in two upper and lower rows.

  On the other hand, the upper member 40 has a horizontal portion 41 placed on the upper surface 6a of the beam 6 and a vertical portion 42 that is bent substantially perpendicularly from one end of the horizontal portion 41 and hangs down in the attached state shown in the figure. As a whole, it is formed in a substantially L shape in a side view.

  Mounting holes (not shown) are formed in the vertical portion 42 of the upper member 40 at positions corresponding to the mounting holes 34a and 34b formed in the vertical plate 21 of the lower member 20, and these mounting holes are inserted. The vertical portion 42 of the upper member 40 is fixed to the outer side of the vertical plate 21 of the lower member 20 by mounting bolts 35a and 35b. As a result, the upper member 40 and the lower member 20 are integrated to form the clamp 10.

  A hook 43 for locking the safety net is fixed to the outside of the vertical portion 42 by welding or the like.

  The hook 43 may be any shape, size, number, etc. as long as it can lock the safety net, but in this embodiment, the round bar is spirally wound over 360 degrees. Each has an upper end 43a and a lower end 43b facing inward (direction toward the vertical portion 42) (FIG. 4).

  The tip of the horizontal portion 41 is bent downward to form a detachment preventing portion 44 that locks the tip of the beam upper surface 6a in the attached state.

  Here, the operation relating to the locking (gripping) / release of the cam 23 described above will be described with reference to FIGS.

  First, FIG. 5 shows a state when the cam 23 is in the locked state and grips the beam lower surface 6c, but FIGS. 1 to 3 are also diagrams showing the same state. ) And FIG. 5 (b) are enlarged views of the cam-related mechanism portion shown in FIG. 1 and FIG.

  As shown in these drawings, in this state, the free link pin 27 is in an upper position (a position above a straight line connecting the fixed link pin 29 and the free link pin 25, in other words, the link arms 26 and 26 and the link. The arm 28 is bent upward), and the cam 23 is urged to rotate clockwise (FIGS. 1 and 5) by the spring 36 and protrudes above the upper end 22a of the main body plate. That is, in this state, the cam 23 presses the beam lower surface 6 c, grips the beam 6 with the horizontal portion 41 of the upper member 40, and the clamp 10 is securely fixed to the beam 6.

  When the operation lever 30 is pulled down from this locked (gripping) state and the positional relationship shown in FIGS. 2 and 6 is reached, the link arm 28 comes into contact with the spring pin 32 as a stopper, so the operation lever 30 is further lowered. Can not do it. In this state, the free link pin 27 moves to a lower position (a position below the straight line connecting the fixed link pin 29 and the free link pin 25, in other words, the link arms 26 and 26 and the link arm 28 are bent downward). Unless the operation of pulling this up to the upper position is performed, the cam 23 does not protrude from the upper end 22a of the main body plate, and maintains the open state (FIG. 6) embedded in the main body plates 22 and 22.

  In order to shift from the open state to the locked (gripping) state, as described above, the operating lever 30 may be lifted to move the free link pin 27 to the upper position.

  In this embodiment, the vertical plate 21 of the lower member 20 and the vertical portion 42 of the upper member 40 constitute a “vertical portion” in this embodiment, and the upper member Forty horizontal portions 41 constitute a “horizontal portion”, and the lower member 20 excluding the vertical plate 21 constitutes a “main body portion”.

  7 to 9, a safety net clamp (hereinafter simply referred to as “clamp”) 11 according to another embodiment of the present invention is shown attached to a beam 8 made of channel steel. Yes. The clamp 11 according to this embodiment is configured to be attachable to channel steel having three different sizes (heights). FIG. 7 to FIG. 9 show a state in which it is attached to the smallest-sized channel steel 8 among the three types of applicable channel steels.

  The clamp 11 is composed of two members, a lower member 20 and an upper member 50. Since the lower member 20 has substantially the same configuration as that of the first embodiment, description thereof is omitted. Since the mechanism and operation related to the cam 23 of the lower member 20 are the same as those already described in the first embodiment, the description thereof will be omitted, and the reference numerals in the drawing will be simplified.

  The upper member 50 of the clamp 11 has a horizontal portion 51a placed on the upper surface 8a of the beam 8 and a vertical portion 51b extending along the side surface 8b of the beam 8 in the attached state shown in the drawing. An L-shaped plate 51 formed in a letter shape, a pair of arms 52, 52 fixed from the upper end of the vertical portion 51b of the L-shaped plate 51 to the horizontal portion 51a and projecting forward of the horizontal portion 51a, and an L-shaped plate And a hook 53 fixedly welded to the vertical portion 51b.

  The distal ends of the horizontal arms 52, 52 are bent downward to form detachment preventing portions 56, 56 that lock the distal end of the beam upper surface 8a in the attached state. The hook 53 has the same shape as the hook 43 in the clamp 10 of the first embodiment (see FIG. 4).

  Referring also to FIG. 10, the L-shaped plate vertical portion 51 b is provided with mounting holes at different height positions so as to be paired in left and right in multiple stages. In this embodiment, the mounting holes are provided in five stages from the bottom: a pair of mounting holes 54a and 54b, a pair 54c and 54d, a pair 54e and 54f, a pair 54g and 54h, and a pair 54i and 54j. Of these, the mounting holes 54b, 54d, 54f, 54h, 54j located on the right side in FIG. 10B are formed as round holes through which the mounting bolts 35a, 35b (see FIG. 1) are inserted. The mounting holes 54 a, 54 c, 54 e, 54 g, 54 i located on the left side in b) are formed in a substantially semicircular shape, and these are continued by the sliding groove 55.

  Here, the center distance in the width direction between each pair of mounting holes (FIG. 10B: W2) is the distance between each pair of mounting holes 34a, 34b and 34c, 34d formed in the vertical plate 21 of the lower member 20. Is equal to the center distance in the width direction (FIG. 2: W1) (W1 = W2). Further, the center distance in the height direction between the mounting holes 54a and 54b and the mounting holes 54c and 54d (FIG. 10B: L2), the height direction between the mounting holes 54c and 54d and the mounting holes 54g and 54h. The center distance (FIG. 10B: L3) and the center distance in the height direction between the attachment holes 54e, 54f and the attachment holes 54i, 54j (FIG. 10B: L4) are both of the lower member 20. It is formed to be equal to the center distance in the height direction (FIG. 2: L1) between the lower mounting holes 34a, 34b and the upper mounting holes 34c, 34d formed in the vertical plate 21 (L1 = L2 = L3). = L4).

  Accordingly, the mounting holes 54a and 54b and the mounting holes 54c and 54d, the mounting holes 54c and 54d and the mounting holes 54g and 54h, or the mounting holes 54e and 54f and the mounting holes 54i, which are formed in the L-shaped plate vertical portion 51b of the upper member 50. 54j is selected from the three combinations, and these are aligned at the lower mounting holes 34a and 34b and the upper mounting holes 34c and 34 formed in the vertical plate 21 of the lower member 20, The upper member 50 can be fixed to the lower member 20 by superimposing the L-shaped plate vertical portion 51b of the upper member 50 on the vertical plate 21 of the lower member 20 and passing the mounting bolts 35a and 35b through these mounting holes, respectively.

  7 to 9, the combination of the mounting holes 54e and 54f and the mounting holes 54i and 54j is selected from the above-described three combinations of the mounting holes in the L-shaped plate vertical portion 51b of the upper member 50, and these mounting holes are selected. Since the fixing bolts 35a and 35b are fixed to the mounting holes 34a and 34b and the mounting holes 34c and 34d of the vertical plate 21 of the lower member 20, respectively, the upper member 50 is fixed at the lowest position with respect to the lower member 20. ing. Therefore, in this fixed state, three types of channel steels to which the clamp 11 can be attached between the L-shaped plate horizontal portion 51a of the upper member 50 and the cam 23 protruding above the lower member 20 are used. Of these, the smallest size grooved steel 8 can be gripped.

  From this state, by changing to another combination of mounting holes in the L-shaped plate vertical portion 51b of the upper member 50 and fixing the mounting bolts 35a and 35b, beams made of other (larger) size steel bars It becomes possible to attach the clamp 11 with respect to.

  For example, as shown in FIGS. 11 to 13, the combination of the mounting holes 54a and 54b and the mounting holes 54c and 54d is selected from the above-described three combinations of the mounting holes in the L-shaped plate vertical portion 51b of the upper member 50. If the upper member 50 is fixed to the lower member 20 through the mounting bolts 35a and 35b in the mounting holes 34a and 34b and the mounting holes 34c and 34d of the vertical plate 21 of the lower member 20, respectively, the clamp 11 is fixed. Among the three types of attachable channel steels, the largest channel steel 9 can be gripped.

  Although not shown, a combination of the mounting holes 54c and 54d and the mounting holes 54g and 54h is selected, and the mounting holes are respectively mounted on the mounting holes 34a and 34b and the mounting holes 34c and 34d of the vertical plate 21 of the lower member 20. If the upper member 50 is fixed to the lower member 20 through the bolts 35a and 35b, among the three types of channel steels to which the clamp 11 can be attached, intermediate size channel steels can be gripped.

  In order to change the combination of the mounting holes used in the L-shaped plate vertical portion 51b of the upper member 50 according to the size of the channel steel to which the clamp 11 is to be mounted, the upper member 50 is removed after all the mounting bolts 35a and 35b have been removed. The mounting holes to be used may be aligned with the mounting holes 34a and 34b and the mounting holes 34c and 34d of the vertical plate 21 of the lower member 20 and fixed through the mounting bolts 35a and 35b. According to this example in which the mounting holes 54a, 54c, 54e, 54g, 54i are made continuous by the sliding groove 55, the changing operation can be performed more easily.

  That is, for example, when changing from a state suitable for the small size grooved steel 8 shown in FIGS. 7 to 9 to a state suitable for the large size grooved steel 9 shown in FIGS. After removing the bolts 35a and 35b (the mounting bolt 35a through which the mounting hole 54f and the mounting hole 34b are inserted, and the mounting bolt 35b through which the mounting hole 54j and the mounting hole 34d are inserted) The bolts 35a and 35b (the mounting bolt 35a that passes through the mounting hole 54e and the mounting hole 34a, and the mounting bolt 35b that passes through the mounting hole 54i and the mounting hole 34c) are loosened, and the L-shaped plate of the upper member 50 51 is slid rightward as viewed from the side with respect to the vertical plate 21 of the lower member 20, and the mounting bolts 35a, 35b are accommodated in the sliding groove 55, and the L-shaped plate 51 of the upper member 50 is positioned at this relative width direction position. Down The material 20 is slid downward with respect to the vertical plate 21 so that the mounting holes 54e and 54f and the mounting holes 34c and 34d, the mounting holes 54a and 54b, and the mounting holes 34a and 34b have the same height. Then, the L-shaped plate 51 of the upper member 50 is slid to the left in the side view with respect to the vertical plate 21 of the lower member 20, and the mounting bolts 35a and 35b, which are loosened, are half of the mounting holes 54a and 54c. Tighten these mounting bolts into the circular part.

  By doing in this way, without removing the upper member 50 from the lower member 20, it can adapt to the size change of the beam which should attach the clamp 11. FIG.

  In this embodiment, the vertical portion 21 of the lower member 20 and the vertical portion 51b of the L-shaped plate 51 of the upper member 50 define a “vertical portion”. The horizontal portion 51a of the L-shaped plate 50 of the upper member 50 and the horizontal portions of the arms 52 and 52 constitute a “horizontal portion”, and the lower member 20 excluding the vertical plate 21 constitutes a “main body portion”. Yes.

  In this embodiment, an operation process for attaching / detaching the clamp 11 of Embodiment 2 to / from a beam at a station platform height will be described. The beam is shown as being made of a large-sized channel steel 9, and the upper member 50 is shown fixed to the lower member 20 in the positional relationship shown in FIGS. However, the attachment / removal process for other sizes of channel steel is similar. The operation process for attaching / removing the clamp 10 according to the first embodiment is the same.

  Referring to FIG. 14, the operation of attaching the clamp 11 to the beam 9 confirms that the cam 23 is in the open state (FIG. 6), or pulls down the aforementioned operation lever 30 when in the locked state (FIG. 5). After shifting to the open state by operation, the connecting rod 37 is set on the end fitting 61 of the clamp operating rod 60 (FIG. 14A).

  An example of the clamp operating rod 60 is shown in FIG. The clamp operating rod 60 can be telescopically extended, and it is convenient to carry and store if shortened as shown in FIG. 10A, and the maximum length is about 6 m when extended as shown in FIG. It becomes.

  An example of the end fitting 61 of the clamp operating rod 60 is shown in FIG. The tip fitting 61 includes a bolt shaft 63 fixed to the tip of the clamp operation rod 60 with a nut 62, a pipe 64 fixed to the tip of the bolt shaft 63, and an inverted portion fixed in an open state to the tip of the pipe 64. And a quadrangular pyramid-shaped entrance guide 65. The pipe 64 can accommodate a connecting rod 37 extending obliquely downward from the lower member 20 of the clamp 11, and both sides of the lower portion thereof are cut away, and a pair of closing plates 67, 67 are arranged to face the cut portion 66. ing. The width interval between the closing plates 67 and 67 substantially matches the facing width of the hexagonal cross section of the connecting rod 37, and when the lower end of the connecting rod 37 is accommodated in the pipe 64 via the inlet guide 65, the closing plate 67. , 67 so as to be non-rotatably accommodated.

  Using such a clamp operating rod 60, the connecting rod 37 of the clamp 11 in the cam open state is set on the tip fitting 61 of the clamp operating rod 60 so that the clamp 11 can be remotely operated from below. For example, in the case where the clamp 11 is attached to the beam 6 (or the beams 8 and 9 made of channel steel) located near the roof 20 of the station platform as shown in FIG. As shown in FIG. 21, the operator 14 can hold the clamp operation rod 60 and attach the clamp 11 from the home 1. Removal can be performed by the same remote operation.

  By such remote operation from the home 1, the clamp 11 (FIG. 14A) set on the end fitting 61 of the clamp operation rod 60 via the connecting rod 37 is lifted to the height of the beam 9, and the upper member 50 is moved. The beam 9 is covered from obliquely above (FIG. 14B). At this time, if the beam 9 protrudes from the platform 1 toward the track 7, the clamp operating rod 60 of the operator 14 is tilted as shown in the figure, and the clamp 11 is also tilted. The detachment preventing portions 56, 56 at the tips of the horizontal arms 52, 52 of the upper member 50 are advanced to a position beyond the beam upper surface 9a, and are engaged with the tips of the beam upper surface 9a. Then, when the lower member 20 of the clamp 11 is advanced by the clamp operation rod 60 while maintaining this beam locking state, the clamp 11 becomes upright, and the beam 9 is placed between the upper member 50 and the lower member 20. Can be accommodated.

  Next, the cam 23 is shifted from the open state to the locked (gripping) state while the clamp operating rod 60 holds the upright accommodation state of the clamp 11. This operation can be suitably performed by pushing up the operation lever 30 using a cam switching operation rod 70 as shown in FIG.

  The cam switching operation rod 70 is a telescopic type that is the same as the clamp operation rod 60. If it is shortened as shown in FIG. 18 (a), it is convenient to carry and store, and it can be extended as shown in FIG. 18 (b). If it does, it will be a maximum length of about 6m.

  A metal fitting 71 is fixed to the tip of the cam switching operation rod 70 with a nut 72 screwed to the bolt shaft 73. As shown in FIG. 19, the metal fitting 71 has a wave-shaped locking piece 74 fixed to the tip of a bolt shaft 73. The locking piece 74 is formed such that an inverted triangular portion 75 that opens upward and a triangular portion 76 that opens downward have a wave shape, and the apex ( The trough portion 75 a and the apex (mountain portion) 76 a of the triangular portion 76 serve as a locking portion for locking the horizontal bar 31 of the clamp 11. The apex locking part 75 a of the inverted triangular part 75 is located on the axis of the bolt shaft 73, and the apex locking part 76 a of the triangular part 76 is located away from the axis of the bolt shaft 73.

  By using such a cam switching operation rod 70, the operation lever 30 is pushed up with the horizontal bar 31 placed on the inverted triangular apex locking portion 75a of the end fitting 71, so that the cam in the opened state (FIG. 6). 23 is shifted to a locked or gripping state (FIG. 5) (FIG. 14C). As a result, as described above, the cam 23 receives the rotational bias of the spring 36 and rotates in the direction protruding from the upper end 23a of the main body plate, and grips the beam 8 with the L-shaped plate horizontal portion 51a of the upper member 50. To do.

  Note that the operation lever 30 at this time is prevented from swinging like a pendulum, since the spring pin 33 serves as a stopper to prevent further rotation in the counterclockwise direction (FIG. 14). The upper worker 14 is stopped at a position where it can be easily pushed up by the cam switching operation rod 70.

  As described above, the clamp 11 is attached to the beam 9 by the remote operation by the worker 14 on the home 1, so the clamp operation rod 60 and the cam switching operation rod 70 are removed to complete the clamp installation operation (FIG. 14D). ).

  After attaching the plurality of clamps 11 to the beam 9 at appropriate intervals in this way, the end rope 13 of the safety net 12 is hooked on the hook 53 of each clamp 11 to stretch the safety net 12. This net installation work can also be performed by remote operation by the worker 14 of the home 1. That is, as shown in FIG. 22, the end rope 13 is put on the hook 53 of each clamp 11 with the end rope 13 placed on the inverted triangular vertex locking portion 75 a of the tip fitting 71 of the cam switching operation rod 70. Hook one after another. By using the hook 53 having a shape as shown in FIG. 4, the operation of hooking the end rope 13 can be easily performed, and a stable locked state can be maintained.

  FIG. 23 shows a state where the installation work of the safety net 12 is completed.

  The safety net 12 is removed after the height work is completed, and the clamp 11 attached to the beam 9 must also be removed. These operations can also be performed remotely by the operator 14 on the home 1.

  First, the end rope 23 of the safety net 12 stretched as shown in FIG. 23 is removed from the hook 53 using the cam switching operation rod 70, and the safety net 12 is removed. This work can be performed in the reverse order of the work described above with reference to FIG.

  Next, an operation for removing the clamp 11 (FIG. 14D) attached to the beam 9 will be described with reference to FIG.

  First, the connecting rod 37 of the clamp 11 (FIG. 15A) attached to the beam 9 is inserted into the tip fitting 61 of the clamp operating rod 60, and the cam is switched while the clamp 11 is supported by the clamp operating rod 60. After the horizontal bar 31 is hooked on the triangular apex locking portion 76a of the tip fitting 71 of the operating rod 70, the cam switching operating rod 70 is pulled down (FIG. 15B). As a result, the operating lever 30 is lowered, and the cam 23 in the locked or gripping state (FIG. 5) shifts to the open state (FIG. 6) and is buried in the main body plates 22 and 22. Then, the cam switching operation rod 70 is removed, and the clamp 11 is pulled toward the front by the clamp operation rod 60 (FIG. 15C), and then the clamp 11 is lifted, whereby the detachment preventing portion 56 of the upper clamp member 50 is obtained. 56 can be removed from the tip of the beam 9 and the clamp 11 can be removed (FIG. 15D).

  Although the embodiment of the safety net clamp according to the present invention has been described in detail above, the present invention can be widely modified and changed within the scope of the invention described in the claims.

  For example, in these embodiments, the clamps 10 and 11 are constituted by the lower member 20 and the upper members 40 and 50, and the vertical plates 21 and the vertical portions 42 and 51b are overlapped with each other so that the mounting bolts 35a and 35b are stacked. However, the lower member and the upper member may be integrally formed in advance. In this case, the clamp can be attached only to a specific type and size of a structure (such as a beam).

  In the distal end fitting 61 of the clamp operation rod 60, the inlet guide 65 has an inverted quadrangular pyramid shape in the illustrated embodiment. However, the inlet guide 65 smoothly accommodates the connecting rod 37 in the pipe 64 of the distal end fitting 61 during remote operation. Since it is for mounting non-rotatably between the closing plates 67, 67, the shape is not limited as long as such a guide action can be realized. For example, an entrance guide having an inverted cone shape or an inverted triangular pyramid shape may be used.

  Further, the connecting rod 37 is formed of hexagonal steel in the illustrated embodiment, but the shape thereof is not limited as long as it is non-rotatably attached to the end fitting 61 of the clamp operation rod 60. It may have a polygonal cross section or an elliptical cross section. The shape and configuration of the tip fitting 61 of the clamp operation rod 60 are changed according to the shape of the connecting rod 37 so that it can be mounted in a non-rotatable manner.

1 Train station platform 2 Roof 3 Eaves 4 Pillar 5 Cross beam 6 Beam (lightweight steel)
7 Line 8, 9 Beam (Groove shape steel)
10 Safety net clamp (Example 1)
11 Safety net clamp (Example 2)
12 Safety net 13 End rope 14 Worker 20 Lower member 21 Vertical plate 22 Main plate 22a Upper end 23 of main plate Cam 24 Cam pins 25, 27 Free link pins 26, 28 Link arm 29 Fixed link pin 30 Operation lever 31 Horizontal bar 32 , 33 Spring pins 34a to 34d Mounting holes 35a, 35b Mounting bolt 36 Spring 37 Connecting rod 40 Upper member 41 Horizontal portion 42 Vertical portion 43 Hook (safety net end rope locking hook)
44 Detachment prevention part 50 Upper member 51 L-shaped plate 51a Horizontal part 51b Vertical part 52 Arm 53 Hook (Safety net end rope locking hook)
54a to 54j Mounting hole 55 Sliding groove 56 Disengagement prevention portion 60 Clamp operation rod 61 Tip fitting 62 Nut 63 Bolt shaft 64 Pipe 65 Entrance guide 66 Cutting portion 67 Closing plate 70 Cam switching operation rod 71 Tip fitting 72 Nut 73 Bolt shaft 74 Wave-shaped locking piece 75 Inverted triangular portion 75a Locking portion 76 Triangular portion 76a Locking portion

Claims (18)

This is a safety net clamp that is used by fixing it to a structure in order to stretch a safety net that protects an operator who has accidentally fallen from a high place, in one direction from the vertical part and the upper end of this vertical part. It has a horizontal part that extends, a hook for hooking the rope of the safety net provided on the back of the vertical part, and a main part connected to the lower end of the vertical part. And a switching means for holding the cam in either a gripping state in which the cam is urged to rotate upward from the main body portion or an open state in which the cam is buried and accommodated in the main body portion, and extending downward from the main body portion. And fixing the structure to the structure by grasping the structure between the horizontal portion and the cam in the grasping state while bringing the vertical portion into contact with the side surface of the structure. The switching means includes Is connectable to arm switching operation rod, characterized in that the connecting rod can be coupled a clamp operating rod. 2. The safety net according to claim 1, wherein a disengagement preventing portion projecting downward from the front end of the horizontal portion is provided, and the disengagement preventing action is achieved by locking the front end of the building portion when fixed to a building. Clamp. The cam is provided so as to be rotatable around the cam pin via a link mechanism including at least two link arms and a link pin that rotatably connects the link arms, and the switching means is connected to the link pin. 3. The safety net clamp according to claim 1, further comprising an operating lever having an upper end connected and hanging downward. The safety net clamp according to claim 3, wherein a horizontal bar is provided at a lower end of the operation lever. The safety net clamp according to claim 3 or 4, wherein movement restricting means for restricting movement of the operation lever is provided in the main body. When attaching the clamp to the structure, push up the operating lever to switch the cam from the open state to the gripping state, and when removing the clamp from the structure, pull down the operating lever to switch the cam from the gripping state to the open state. The safety net clamp according to any one of claims 3 to 5. The cam switching operation rod is a member in which a metal fitting provided with a corrugated locking piece is attached to the end of a long bar, and when attaching a clamp to a structure, an inverted triangular portion of the corrugated locking piece When the horizontal bar is applied to the bottom of the arm and pushed up, the operating lever is raised to switch the cam from the open state to the gripping state, and when removing the clamp from the structure, the top of the triangular portion of the wave-shaped locking piece 5. The safety net clamp according to claim 4, wherein the operation lever is lowered by applying and pulling down the horizontal bar to switch the cam from a gripping state to an open state. 8. The safety net according to claim 1, wherein the clamp operating bar is provided with a metal fitting for non-rotatably mounting the connecting bar at the end of a long bar. Clamp. 9. The safety net clamp according to claim 8, wherein the connecting rod has a polygonal cross-sectional shape, and the clamp operating rod has an accommodating portion corresponding to the cross-sectional shape of the connecting rod. The safety net clamp according to claim 9, wherein an inlet guide for guiding the connecting rod to the housing portion is provided at a tip of the metal fitting of the clamp operating rod. 11. The safety net clamp according to claim 10, wherein the entrance guide has an inverted quadrangular pyramid shape or an inverted conical shape. The safety net clamp according to any one of claims 1 to 11, wherein each of the cam switching operation rod and the clamp operation rod is extendable and has a maximum length of 5 to 7 m when extended. The vertical portion is fastened in a state where the first vertical portion and the second vertical portion are overlapped, and the first vertical portion, the horizontal portion, the upper member having the hook, and the second vertical portion The safety net clamp according to any one of claims 1 to 12, wherein the safety net clamp comprises a lower part having a portion and a main body portion. At least one of the first vertical portion and the second vertical portion has a plurality of mounting holes in the width direction, and is formed in multiple stages in the height direction, and using any combination of these multi-stage mounting hole pairs 14. The safety net clamp according to claim 13, wherein the safety net clamp can be attached to a structure of a different size by fastening. One mounting hole in the width direction of the pair of mounting holes in each step is formed as a circular hole through which a bolt for fastening is inserted, and the other mounting hole in the width direction is a substantially semicircular hole that is substantially divided into two in the width direction. The substantially semicircular hole is formed by a sliding groove extending in the height direction, and the clamp height can be adjusted without separating the upper member and the lower member. 15. The safety net clamp according to claim 14, wherein: The safety net clamp according to any one of claims 1 to 15, wherein the cam has a twill-like or parallel groove-like tooth formed at a tip thereof. The safety net clamp according to any one of claims 1 to 16, wherein the safety net end rope locking hook is formed by bending a round bar spirally by 360 degrees or more. A safety net tensioning method using the safety net clamp according to any one of claims 1 to 17, wherein the clamp is lifted to a height of a structure to which a clamp is to be attached by the clamp operating rod connected to the connecting rod, The clamp is set in a state in which a structure is accommodated between the horizontal portion and the cam in the open state, and in this state, the operation lever is pushed up by the cam switching operation rod to change the cam from the open state to the gripping state. After switching and fixing the clamp to the structure, remove the clamp operating rod and the cam switching operating rod, and lock the safety net end rope to the safety net end rope locking hook to secure the safety net. A safety net laying method characterized by laying.

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