JP2011047223A - Bracket for fall preventive net - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with a dramatic increase in the number of brackets for a fall preventive net required by the revised Ordinance on Industrial Safety and Hygiene by providing a bracket for the fall preventive net of one kind of configuration to replace both types of brackets, i.e. the type using a wedge as a fixing means and the type using a clamp as a fixing means which have been conventionally used in a scaffold assembly. <P>SOLUTION: The bracket for the fall preventive net has both of a wedge and a clamp. The clamp is horizontally rotatable to prevent collision with a pipe when it is not used. The pipe of the scaffold can be sandwiched and fixed by sandwiching the ends of sandwiching plates on both sides of the lower end of a base. A plate for placement is provided on the top of a clamp mounting part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bracket for a fall prevention net for stretching a fall prevention net provided in a gap between a scaffold for construction of a building and the building, that is, extending and dropping between the scaffold and the wall surface of the building. Stabilizes the fixing state of the scaffold to the pipe, the arm to which the prevention net is attached, the base to which the arm is attached, the fixing part having fixing means for fixing the base to the pipe of the scaffold It relates to a bracket for a fall prevention net having a locking portion of a role, and more specifically, as a fixing means for a fixing portion, it is wound and fixed to a wedge portion to be fitted and fixed to a wedge receiver of a scaffolding pipe and a scaffolding pipe The clamp is attached to the clamp mounting part that is integrated with the base via a hinge so that it can be rotated horizontally so that it does not collide with the scaffolding pipe when not in use. The length of the clamping end from the end of the bottom plate of the locking part consisting of the clamping plate and the bottom plate on both sides to the end of both clamping plates has an extension of more than half the diameter of the pipe of the scaffold The fall is characterized in that it is constructed so that the pipes of the scaffolding can be clamped and fixed at the clamping ends of the clamping plates on both sides, and a plate for placement is provided at the top of the clamp mounting part The present invention relates to a bracket for a prevention net.

  Conventionally, there has been a bracket for a fall prevention net for stretching a fall prevention net provided in a gap between a building scaffold and a building. That is, when constructing a scaffold for construction, it is usual to provide a gap of 300 mm to 500 mm between the scaffold and the wall surface of the building frame, that is, the wall surface before the exterior material is applied. . If this gap is too narrow, it will affect the ease of work by the worker, that is, the stroke of the arm when the worker works with the arm extended, and if the exterior material of the wall is attached to the housing There is a fear that the gap becomes too narrow. On the other hand, if it is too wide, it is difficult to work, and the danger of dropping of workers and tools etc. increases. Therefore, this gap is generally within the range of 300 mm to 500 mm, although it depends on the thickness of the wall surface exterior material.

  Normally, a “fall prevention net” is stretched in the gap to prevent the danger of a worker falling or tools falling. That is, as shown in FIG. 15, the fall prevention net N is stretched in the gap Cr of the interval Ds. In addition, P is a pipe of a scaffold, W is a wall surface before constructing the exterior material of a building. SC is a scaffold and M is a worker.

  The fall prevention net N is a mesh body made of synthetic resin having meshes with an interval of about 1 to 2 cm. The fall prevention net N covers the gap Cr and is stretched in a state of being extended in the horizontal direction along the extension of the gap Cr. Therefore, in order to support the fall prevention net N in a horizontal state, the fall prevention net bracket B is attached and fixed to the pipe P of the scaffold at an appropriate interval.

  11 and 12 show an example of a conventional fall prevention net bracket B. FIG. The fall-prevention net bracket B is made of metal, and is provided between the scaffold SC and the wall surface W of the building. The arm B1 is attached to the fall-prevention net N, and the base is attached to the arm B1. B2 includes a fixing portion B3 having a fixing means for fixing the base B2 to the pipe P of the scaffold, and a locking portion B4 that serves to stabilize the fixing state of the scaffold to the pipe P.

The arm portion B1 has a double cylindrical structure, and the length of the entire arm portion B1 is shortened by sliding the inner tube B11 into the outer tube B12 (direction X), and the inner tube B11 is pulled out from the outer tube B12 (direction Y). ), The entire length of the arm B1 can be extended. The length of the arm portion B1 is adjusted as appropriate according to the gap Cr, and is fixed by a fixing screw B14. A shallow groove (not shown) is cut on the lower surface of the inner cylinder B11, and the tip of the screw B14 is fixed by being pressed against the shallow groove. In addition, a hook B13 for hooking the fall prevention net N is fixed to the tip of the inner cylinder B11. Further, a rectangular locking plate B15 is welded to the lower left portion of the outer cylinder B12 (see FIGS. 11 and 14).

  The base B2 is a case in which the front view is a Greek letter Γ in front view of FIG. 12, and the upper surface, the right side surface, and the lower surface are open, and the lower right end of the front plate B21 and the rear plate B22. A bolt B23 is provided between the two. A hook B24 for attaching the fall prevention net N is fixed to the upper part of the base part B2, a locking part B4 is fixed to the lower part, and a fixing part B3 is fixed to the upper part of the left side surface.

  The fixing portion B3 is a wedge-shaped member, and the wedge base portion B31 and the wedge B32 are integrally formed, and the wedge base portion B31 is fixed to the left side surface of the base portion B2 by welding. The wedge B32 extends and projects downward in a wedge shape with a slight gap c between the left side surface of the base portion B2.

  The locking portion B4 is fixed to the lower end portion of the base portion B2, and a locking plate B41 on the front side, a locking plate B42 on the back side, and a bottom plate B43 are integrally formed. Slight step portions d and d are provided on the lower sides of the locking plate B41 and the locking plate B42, and the bottom plate B43 is formed on the front plate B41 and the rear plate B42 so that the left end is located at the position of the step portions d and d. It is handed over between. As shown in FIG. 12, the position of the steps d, d, that is, the position of the left end of the bottom plate B43 is configured to be the same as the position of the left end of the wedge base B31 and the wedge B32 of the fixed part B3 in plan view. Has been. The locking end B41a on the left side of the step d of the locking plate B41 and the locking end B42a on the left of the step d of the locking plate B42 are extended to the left with the same length a. However, the length a is smaller than half the diameter φ of the pipe P of the scaffold (φ / 2).

  The operation of the fall prevention net bracket B will be briefly described below. The bracket B for fall prevention net is used by inserting and fixing the wedge B32 of the fixing portion B3 to the wedge receiver PS of the pipe P of the scaffold. That is, the wedge B32 is inserted into the wedge receiver PS of the pipe P of the scaffold, and the upper surface B31a of the wedge base B31 of the fixing portion B3 is hit with a hammer to be fitted and fixed to the wedge receiver PS of the pipe P. When detaching from the pipe P, the lower end of the base B2 is hit with a hammer to remove the wedge B32 from the wedge receiver PS.

  FIG. 15 shows a state in which the fall prevention net bracket B is fixed to the pipe P. As shown in FIG. 15, the inner cylinder B11 of the arm part B1 is appropriately slid so as to have a length substantially the same as the distance Ds of the gap Cr between the pipe P and the wall surface W of the scaffold, and the hook of the base part B2 The fall prevention net N is stretched by hooking B24 and the hook B13 at the tip of the inner cylinder B11 on the mesh of the fall prevention net N. At this time, as shown in FIG. 12, both ends of the locking plate B15 fixed to the lower left portion of the outer cylinder B12 are locked to the central lower portion of the front plate B21 and the rear plate B22 of the base B2, thereby The state where B1 is extended horizontally from the base B2 is maintained.

  Further, as shown in FIG. 12, the left side of the wedge base B31 and the wedge B32 of the fixing part B3 and the left end of the bottom plate B43 of the locking part B4 are in the same position in plan view and come into contact with the pipe P. The swinging of the net bracket B in the vertical direction is prevented. Further, the locking end B41a of the locking plate B41 of the locking portion 4 and the locking end B42a of the locking plate B42 come into contact with the side surface of the pipe P, whereby the fall prevention net bracket B is shaken in the horizontal direction. Movement is prevented.

  In FIG. 14, the storage state at the time of non-use of the bracket B for fall prevention nets is shown. When the drop prevention net bracket B is not in use, the inner cylinder 11 is stored in the outer cylinder 12, and the entire arm B1 is rotated to the left (Z1 direction) as shown in FIG. By storing the part in the base B2 (in the Z2 direction), it is possible to achieve a compactly storable state.

  FIG. 13 shows a fall prevention net bracket C which is another form of the conventional fall prevention net bracket. In the fall prevention net bracket C, the arm portion C1 has the same configuration as the arm portion B1 of the fall prevention net bracket B, the base portion C2 has the same configuration as the base portion B2 of the fall prevention net bracket B, and the locking portion C4 also falls. Although the configuration is the same as the base B4 of the prevention net bracket B, the configuration of the fixing portion C3 is different from the configuration of the fixing portion B3 of the fall prevention net bracket B. As the fixing portion C3, the clamp CR is the base C2. It is fixed to the left side.

As described above, the fall prevention net bracket B is used for mounting and fixing to the pipe P having the wedge receiver PS, but the pipe Q without the wedge receiver (see FIG. 13).
It cannot be used for. Therefore, a configuration that can be attached and fixed to the pipe Q without the wedge holder is the fall prevention net bracket C, and the pipe Q without the wedge holder can be attached and fixed via the clamp CR. Alternatively, even if the pipe P having the wedge receiver PS is to be mounted and fixed at a position other than the wedge receiver PS, the fall prevention net bracket B cannot be used. Absent.

  In general, a scaffold for a building is assembled with one floor as the height of the building target, that is, the height of the first floor of the building target. In other words, it is usually assembled based on the floor surface of each floor to be constructed. Therefore, the span of the wedge receiver PS of the pipe P having the wedge receiver PS is determined based on the floor height of a normal building.

  Therefore, in the case of a building having a floor height different from normal, it becomes impossible to assemble a scaffold based on the wedge receiver PS. In such a case, the fall prevention net bracket C in which the fixing portion C3 is the clamp CR is useful. At the current construction site, the usage rate of the fall prevention net bracket B (wedge type) is 60 to 70%, while the usage rate of the fall prevention net bracket C (clamp type) is about 30 to 40%. .

  Below, the patent document which discloses the bracket for fall prevention nets of a prior art is shown. The “Falling net lifting arm” in Patent Document 1 below is an example in which a clamp is used as a fixed portion, and the configuration of the base is slightly different. I have it. Further, in the following “Patent-building fall-preventing net support device and scaffold device” in Patent Document 2, those using clamps and those using wedge portions are disclosed as the configuration of the fixing portion, respectively.

JP-A-7-317298 JP-A-11-172924

  As described above, conventionally, as a bracket for a fall prevention net, both the type using a wedge part as a fixing part and the type using a clamp are 60% to 70% using a wedge part, and the type using a clamp is 3 It has been used at a ratio of ~ 40%. These two types do not have to have only one of them, but the type of scaffolding pipe used as described above and the floor height configuration of the building will determine which one will be used. A considerable number of both types of fall prevention net brackets must be kept available.

  If the target building is small, the number of brackets for fall prevention nets is on the order of several tens to several hundreds at most, so it is not difficult to prepare both. However, when the scale of a building becomes large, a total of thousands of units and in some cases, 10,000 brackets for a fall prevention net are required. Moreover, there are rare cases where both types can be mixed and used at a single construction site, and the contractor will not be able to respond to various requests unless both types are prepared in the same number. there were.

  Even under such circumstances, the scaffolding assemblers managed to prepare both types and used them to the next site when one site was completed. However, according to the revised occupational safety and health regulations that came into force on June 1, 2009, the number of brackets for fall prevention nets that the scaffolding assembler must always have doubled or tripled. We faced the current situation where both types had to be doubled to tripled.

  That is, until now, it has been common to stretch fall prevention nets at a rate of 2 spans or 3 spans in the vertical direction of the scaffold. Therefore, for example, if a fall prevention net is stretched on the second floor scaffold, the third floor scaffold is omitted and the next fall prevention net is stretched on the fourth floor scaffold, or the third and fourth floor scaffolds are omitted. And it was usually done in the form of stretching on a scaffold on the 5th floor. However, this rule revision has made it mandatory to install a fall prevention net on each floor of the scaffolding.

  This is in view of the result that the accident of dropping workers and dropping accidents of tools, etc. have occurred too frequently in the stretched state at a rate of one row per two or three spans so far. This is expected to drastically reduce the number of accidents involving workers and tools, etc., and is considered to have a great effect on ensuring the safety of construction sites. However, on the other hand, the required number of brackets for fall prevention nets has increased 2 to 3 times, and the contractor has to prepare both the wedge type and the clamp type as much as necessary, so the burden is heavy on the scaffold assembly industry It is also true that this is starting to happen. Therefore, the current situation is that there is a demand in the field for measures that can completely clear the revised rules and reduce the burden on the scaffold assembler as much as possible. The revision of the Occupational Safety and Health Regulations reflects the contents of the report compiled in October 2008 by the “Survey Study Group on Prevention of Falling from Scaffolding” established by the Occupational Safety and Health Institute. Therefore, it has been in effect since June 1, 2009.

The present invention has been made to solve the above problems, and provides the following means for solving the problems.
<Solution 1>
A bracket for a fall prevention net for extending a fall prevention net provided in the gap between the scaffold for building construction and the building, that is, a net for preventing fall by extending between the scaffold and the wall surface of the building. The arm part to which the arm part is attached, the base part to which the arm part is attached, the fixing part having fixing means for fixing the base part to the pipe of the scaffold, and the locking of the role of stabilizing the fixing state to the pipe of the scaffold In the fall prevention net bracket having a portion, as a fixing means of the fixing portion, there are both a wedge portion fitted and fixed to the wedge receiver of the scaffolding pipe and a clamp wound and fixed to the scaffolding pipe, A structure that can be rotated horizontally so as not to collide with the pipe of the scaffold when not in use by being attached to the clamp mounting part provided integrally with the base via a hinge, and is composed of a sandwich plate and a bottom plate on both sides. Stop The length of the sandwiched end from the end of the bottom plate to the end of both sandwiched plates has an extension that is more than half of the diameter of the pipe of the scaffold, and the scaffolding at the sandwiched ends of the sandwiching plates on both sides A bracket for a fall prevention net, which is configured so that the pipe can be clamped and fixed, and a plate for placement is provided on the top of the clamp mounting portion.

  According to the solution 1 of the present invention, as the fixing means of the fixing part, both the wedge part fitted and fixed to the wedge receiver of the scaffolding pipe and the clamp wound and fixed to the scaffolding pipe are provided. Therefore, the fall prevention net bracket of the invention of Solution 1 of the present invention can be applied to a pipe having a wedge holder alone or a pipe having no wedge holder. In addition, a pipe having a wedge receiver can be freely attached to a position other than the position of the wedge receiver.

  That is, the fall prevention net bracket according to the invention of Solution 1 of the present invention is a single unit, and functions as both a fall prevention net bracket having only a wedge portion at a fixed portion and a fall prevention net bracket having only a clamp at a fixed portion. It is no longer necessary for the scaffolding assembler to prepare both the fall prevention net bracket having only the wedge portion in the fixed portion and the fall prevention net bracket having only the clamp in the fixed portion as before, It is only necessary to prepare the fall prevention net bracket of the invention of Solution 1 of the present invention, and the number of prepared fall prevention net brackets can be greatly reduced.

  In particular, in the scaffold assembly industry in which the number of prepared brackets for fall prevention nets has been greatly increased due to the enforcement of the revised occupational safety and health regulations of June 1, 2009, the fall of the invention of Solution 1 of the present invention. Since it is only necessary to prepare a bracket for the prevention net, what is the ratio of the conventional bracket for the fall prevention net having only the wedge portion in the fixed portion and the bracket for the fall prevention net having only the clamp in the fixed portion? This eliminates the need for bothering the user and greatly reduces the total number of purchased items, greatly reducing the economic burden.

  Also, decide whether to use either a fall-prevention net bracket that has only a wedge at the fixed part or a drop-prevention net bracket that has only a clamp at the fixed part at each site. The need to bother with the problem of how to reuse or buy a new one from another site is greatly reduced. Since the bracket for the fall prevention net of the invention of the solution 1 of the present invention is provided with both the wedge part and the clamp, it has been a troublesome thing for the person in charge of supplying materials to the site so far. The problem is simplified all at once, it is easy to plan, and there are significant economic benefits.

  According to the solution 1 of the present invention, the clamp is pivoted horizontally so that it does not collide with the pipe of the scaffold when not in use by being mounted on a clamp mounting portion provided integrally with the base via a hinge. Since the wedge portion is inserted and fixed to the wedge receiver of the pipe having the wedge receiver, it is only necessary to rotate the clamp in the horizontal direction so as not to collide with the pipe. Convenient.

  As the previous step to the invention of Solution 1 of the present invention, the idea of mounting the clamp CR on the upper surface of the base D2 via a hinge H as in the case of the fall prevention net bracket D shown in FIG. . Indeed, even in this form, it was initially considered that there would be no problem if the clamp CR was flipped up to the upper surface of the base D2 when the clamp CR was not used.

However, when an actual experiment is performed, when the wedge portion D32 is used, there is a problem that there is no surface on which a hammer to be driven to collide with the wedge receiver PS of the pipe P to collide with the hammer. became. That is, in order to fit and fix the wedge portion D32 of the fall prevention net bracket D configured as shown in FIG. 16 to the wedge receiver PS of the pipe P, the upper surface of the wedge base portion D31 must be hit with a hammer. There is a clamp CR and a hinge H on the upper side, which are in the way and cannot be beaten. For example, the situation is the same even if the clamp CR is rotated to the position indicated by the phantom line (two-dot chain line) in FIG. However, there is no other place suitable for hitting with a hammer, and eventually it is impossible to fit and fix the wedge part D32 to the wedge receiver PS. Therefore, the bracket D for the fall prevention net cannot be determined as being actually usable, and a configuration is adopted in which the clamp is rotated in the horizontal direction as in the invention of Solution 1 of the present invention.

According to the invention of Solution 1 of the present invention, the length from the end of the bottom plate to the end of the sandwich plate on both sides is the scaffolding. It has an extension of more than half of the diameter of the pipe, and it is configured so that the scaffolding pipe can be clamped and fixed, so even when fixed to the scaffolding pipe using a clamp, the horizontal direction of the base , That is, the horizontal swing of the fall prevention net bracket is suppressed.

In the case of the solution 1 of the present invention, when the clamp is used to fix to the pipe of the scaffold, swinging in the vertical direction is suppressed by the clamp. However, since the clamp is configured to rotate in the horizontal direction, it has been confirmed that the swing in the horizontal direction occurs due to the presence of a hinge connecting the clamp and the base. That is, since the clamp is attached to the base portion via the hinge, the swing in the horizontal direction is generated.

Therefore, in order to suppress this horizontal swing, the length of the clamping end from the end of the bottom plate of the locking portion consisting of the clamping plate and the bottom plate on both sides to the end of the clamping plate on both sides is The scaffolding pipe is configured to have an extension of more than half the diameter of the scaffolding pipe, and the scaffolding pipe is configured to be clamped and fixed at the sandwiching end portions of both sandwiching plates. In experiments, this configuration completely eliminated the horizontal oscillation, and a stable configuration was obtained with no oscillation in the vertical and horizontal directions even when the clamp was used.

According to the invention of Solution 1 of the present invention, since the driving plate is provided on the top of the clamp mounting portion, when the wedge portion is used, the top of the clamp mounting portion is stable when hit with a hammer. The shape of the top of the clamp mounting portion is not deformed, and the clamp is not accidentally hit with a hammer.

In the invention of Solution 1 of the present invention, since the wedge portion is provided on the upper portion of the base portion, in order to attach the clamp that rotates in the horizontal direction to the base portion, one support plate of the hinge is attached to the upper surface of the base portion. A clamp mounting portion to be fixed must be provided. When a wedge portion is used, the top of the clamp mounting portion is hit with a hammer. However, the clamp mounting portion may be in the form of a plate to which one of the hinge support plates is fixed, and at the same time, it is only necessary to bend the both ends of the plate shape slightly.

Therefore, since the place where the hammer is hit is not stable like the upper surface B31 of the fixing part B3 of the conventional bracket B for the fall prevention net (see FIG. 12), it is difficult to hit with a hammer and a plate-like object is hit with a hammer. There is a possibility of deformation. Moreover, since the clamp is mounted on the clamp mounting portion, there is a fear that the clamp may be accidentally hit and the clamp may be deformed and cannot be used.

Accordingly, in the invention of Solution 1 of the present invention, a driving plate is provided at the top of the clamp mounting portion, a place for hitting with a hammer is secured, deformation of the upper portion of the clamp mounting portion is prevented, and the clamp is hit. It is configured to prevent mistakes that occur.

Therefore, it is clear that the basic effect of the invention of the solution 1 of the present invention is that it is possible to use a single unit and a method in which the wedge part or the clamp is adapted according to the use environment. If both the wedge part and the clamp are simply provided on the base part, various problems occur as described above. Accordingly, the inventor of the present invention has developed a configuration in which both the wedge portion and the clamp can be used without any problem by producing prototypes at various stages and repeating the experiment, and by developing the configuration of each portion.

In other words, as means for solving the above problems, the clamp has a horizontal rotation system, and the both side plates of the locking portion can be extended from the conventional one to completely clamp the pipe. In addition to the basic configuration of providing both the wedge part and the clamp on the fixed part, this point is narrowed down to three points, and the point where the plate for placement is provided on the top of the clamp mounting part. The essential effect of the invention of Solution 1 of the present invention, that is, the effect that it is possible to fix either the wedge portion or the clamp to the pipe only after the three solutions, that is, the configuration for solving the problem is added. Is demonstrated.

Therefore, the invention of Solution 1 of the present invention is not merely that the wedge portion and the clamp are both provided in the fixed portion, but the above three solutions are all indispensable constituent requirements. In addition to the basic solution of providing both the wedge part and the clamp, it should be said that the invention can be exhibited only when all of these three solutions are prepared and the original effect can be exhibited. In this respect, it should be clearly stated that the present invention has a configuration, action, and effect that could not exist in the past.

It is a front view of the bracket for fall prevention nets of Example 1 of the present invention. (A) It is a top view of the bracket for fall prevention nets of Example 1 of the present invention. (B) It is a bottom view of the bracket for fall prevention nets of Example 1 of the present invention. It is an enlarged view of the principal part of FIG. (A) It is an enlarged view of the principal part of FIG. 2a. (B) It is an enlarged view of the principal part of FIG. 2b. (A) It is the enlarged view which notched a part of principal part of FIG. 2a. (B) It is the enlarged view which notched a part of principal part of FIG. 2b. It is a front view of the principal part at the time of the clamp non-use of the bracket for fall prevention nets of Example 1 of the present invention. It is the top view which notched a part of principal part at the time of the clamp non-use of the bracket for fall prevention nets of Example 1 of the present invention. It is the bottom view which notched a part of principal part at the time of the clamp non-use of the bracket for fall prevention nets of Example 1 of the present invention. It is an external appearance perspective view of the bracket for fall prevention nets of Example 1 of the present invention. (A) It is explanatory drawing explaining the state which fixes the bracket for fall prevention nets of Example 1 of this invention to a scaffold using a clamp, and stretches the fall prevention net between the scaffold and the wall surface of a building. . (B) It is explanatory drawing explaining the state which fixes the bracket for fall prevention nets of Example 1 of this invention to a scaffold using a wedge part, and stretches the fall prevention net between the scaffold and the wall surface of a building. is there. It is an external appearance perspective view of an example of the conventional bracket for fall prevention nets. It is a front view of an example of the bracket for conventional fall prevention nets. It is a front view of other examples of the conventional bracket for fall prevention nets. It is explanatory drawing of the accommodation state at the time of non-use of an example of the bracket for conventional fall prevention nets. It is explanatory drawing explaining the state which extended | stretched the fall prevention net between the scaffold and the wall surface of the building using the bracket for conventional fall prevention nets. It is explanatory drawing for demonstrating the principal part of the prototype manufactured in the step which leads to the development of the bracket for fall prevention nets of Example 1 of the present invention.

  DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described in detail below with reference to the drawings. The bracket A for fall prevention net shown in FIG. 10a is made of metal, and is attached to the arm 1 that extends between the scaffolding SC and the wall surface W of the building and to which the fall prevention net N is attached. The base portion 2 is composed of a fixing portion 3 having fixing means for fixing the base portion 2 to the pipe Q of the scaffold, and a locking portion 4 that serves to stabilize the fixing state of the scaffold to the pipe Q.

As shown in FIGS. 1, 2, and 9, the arm portion 1 is a double cylinder, and the length of the entire arm portion 1 is shortened by sliding the inner tube 11 into the outer tube 12 (direction X). By pulling the inner cylinder 11 out of the outer cylinder 12 (direction Y), the entire length of the arm portion 1 can be extended. The length of the arm 1 is adjusted as appropriate, and is fixed with a fixing screw 14. A shallow groove (not shown) is cut on the lower surface of the inner cylinder 11, and the tip of the screw 14 is fixed by being brought into pressure contact with the shallow groove. A hook 13 for attaching the fall prevention net N is fixed to the tip of the inner cylinder 11. Furthermore, a rectangular locking plate 15 is welded to the lower left portion of the outer cylinder 12 (see FIGS. 2b, 3, 4b, and 9). The structure of the above arm part 1 is substantially the same as the conventional brackets B and C for fall prevention nets.

  If the base 2 is a front view of FIG. 1, the front is a case having a Greek letter Γ shape, and the upper surface, right side, and lower surface are open, and the lower right end of the front plate 21 and the back plate 22. Bolts 23 are handed over. A hook 24 for attaching the fall prevention net N is fixed to the center of the upper portion of the base portion 2, a locking portion 4 is fixed to the lower portion, and a wedge portion 31 of the fixing portion 3 is fixed to the upper portion of the left side plate 25. It is fixed. Further, a plate-like clamp mounting portion 26 bent at both ends is protruded and fixed integrally with the front plate 21, the back plate 22, and the left plate 25 at the upper left end of the base 2. A plate-shaped driving plate 27 is fixed to the top of the clamp mounting portion 26 in a horizontal state integrally with the clamp mounting portion 26.

  The fixed part 3 is composed of a wedge part 31 and a clamp 32. In the wedge part 31, a wedge base part 31a and a wedge 31b are integrally formed, and the wedge base part 31a is fixed to the left side plate 25 of the base part 2 by welding. The wedge 31b is extended and protruded downward in a wedge shape with a slight gap c between the left side surface 25 of the base portion 2 and the wedge 31b.

  The clamp 32 is a clamp having a normal configuration, and is mounted on the left side surface of the clamp mounting portion 26 of the base 2 via a hinge 33. 3 to 9, the hinge 33 includes a pivot 33a and support plates 33b and 33c. The support plate 33b is disposed on the left side surface of the clamp mounting portion 26 so that the pivot 33a is positioned in the vertical direction. Are welded to the clamp 32, respectively. Therefore, the clamp 32 is configured to rotate in the horizontal direction (direction R in FIGS. 7 to 9) about the pivot 33 a of the hinge 33.

  The locking portion 4 is fixed to the lower end portion of the base portion 2, and a front-side sandwiching plate 41, a rear-side sandwiching plate 42, and a bottom plate 43 are integrally formed. A slight step portion Da is provided on the lower side of the sandwiching plate 41, and a slight step portion Db is also provided on the lower side of the sandwiching plate 42. The step portions Da and Db are at the same position in front view as shown in FIG. overlapping. As shown in FIGS. 3 and 4b, the bottom plate 43 is provided between the sandwiching plate 41 and the sandwiching plate 42 so that the left end thereof is positioned at the positions of the step portions Da and Db. As shown in FIG. 3, the positions of the step portions Da and Db, that is, the position of the left end of the bottom plate 43 are configured to be the same as the position of the left end of the wedge portion 31 of the fixed portion 3 in plan view. .

As shown in FIGS. 3 and 4b, the sandwiching end portion 41a on the left side of the step portion Da of the sandwiching plate 41 and the sandwiching end portion 42a on the left side of the step portion Db of the sandwiching plate 42 have the same length. Although it extends to the left with L1, the length L1 is larger than one half (φ / 2) of the diameter φ of the pipe P of the scaffold. Further, as shown in FIG. 4b, the sandwiching end 41a is bent in the front direction, and the sandwiching end 42a is bent in the back direction, and between the left end of the sandwiching end 41a and the left end of the sandwiching end 42a. The distance L2 is substantially the same as the diameter φ of the pipe P of the scaffold.

  Below, the effect | action of the bracket A for fall prevention nets of Example 1 is described. First, the case where the pipe Q having no wedge receiver is used will be described. This is included in the following cases when the pipe receiver P having the wedge receiver PS is not used. The bracket A for fall prevention net is used by winding and fixing the clamp 32 of the fixing portion 3 around an arbitrary part of the pipe Q of the scaffold. When removing from the pipe Q, the winding of the clamp 32 may be released.

  FIG. 10 a shows a state in which the fall prevention net bracket A is fixed to the pipe Q using the clamp 32. As shown in FIG. 10a, the inner cylinder 11 of the arm part 1 is appropriately slid so as to be adjusted to have a length substantially the same as the distance Ds of the gap Cr between the pipe Q and the wall surface W of the scaffold, and the hook of the base part 2 24 and the hook 13 at the tip of the inner cylinder 11 are hooked on the mesh of the fall prevention net N, and the fall prevention net N is stretched. At this time, as shown in FIG. 1, the locking plate 15 fixed to the lower left end portion of the outer cylinder 12 is locked to the center lower portion of the front plate 21 and the back plate 22 of the base portion 2, whereby the arm portion 1 is moved. The state extended | stretched horizontally from the base 2 is hold | maintained. This is the same as the conventional fall prevention net bracket B (see FIG. 11).

  The vertical swing of the bracket for the fall prevention net A is prevented by the fixing action itself of the clamp 32. In addition, as shown in FIG. Since the left end of the bottom plate 43 of the portion 4 is in the same position in a plan view and abuts on the pipe Q, the vertical movement of the fall prevention net bracket 1 is further prevented.

  As shown in FIG. 4 a, a gap e is generated between the support plate 33 b and the support plate 33 c of the hinge 33 that connects the clamp 32 to the base 2 while the clamp 32 is fixed to the pipe Q. In this state, the fall prevention net bracket 1 is oscillated in the horizontal direction. That is, since the support plate 33b and the support plate 33c can be rotated about the pivot shaft 33a, the horizontal swing is generated.

However, as shown in FIG. 4b, the clamping end 41a of the clamping plate 41 of the locking portion 4 fixed to the lower end of the base 2 and the clamping end 42a of the clamping plate 42 have a diameter of the pipe Q. Since the length L1 exceeds the half of φ (φ / 2), and the sandwiched end 41a and the sandwiched end 42a are opened at a distance L2 substantially equal to the diameter φ of the pipe Q, the sandwiched end Since the portion 41a and the sandwiching end portion 42a sandwich the pipe Q, and the left end of the bottom plate 43 is in contact with the pipe Q, this prevents the fall prevention net bracket A from swinging in the horizontal direction.

In this respect, actually, only a configuration of the locking plate is made as a prototype similar to the conventional fall prevention net bracket B, and a comparison experiment with the fall prevention net bracket A of Example 1 of the present invention is performed. As a result, in the prototype similar to the conventional fall prevention net bracket B only in the configuration of the locking plate, the horizontal swing occurred, whereas the fall prevention net bracket A of Example 1 of the present invention. It was found that no horizontal oscillation occurred in the case of, and it was practically usable.

Next, the case where the wedge receiver PS of the pipe P of the scaffold having the wedge receiver PS is used will be described. As shown in FIGS. 6 to 8, the fall prevention net bracket A is used by inserting and fixing the wedge 31b of the wedge portion 31 of the fixing portion 3 to the wedge receiver PS of the pipe P of the scaffold. That is, the wedge 31b is inserted into the wedge receiver PS of the pipe P of the scaffolding, and the placing plate 27 provided on the top of the clamp mounting portion 26 of the base 2 is struck with a hammer to thereby receive the wedge of the pipe P. Fit and fix to PS. When removing from the pipe P, the lower end portion of the base portion 2 is hit with a hammer to detach the wedge 31b from the wedge receiver PS. At this time, the clamp 32 is rotated to a position where it does not collide with the pipe P as seen in FIGS.

  FIG. 10 b shows a state in which the fall prevention net bracket A is fixed to the pipe P using the wedge portion 31. As shown in FIG. 10b, the inner cylinder 11 of the arm portion 1 is appropriately slid so as to have a length substantially the same as the distance Ds of the gap Cr between the pipe P and the wall surface W of the scaffold, and the hook of the base 2 24 and the hook 13 at the tip of the inner cylinder 11 are hooked on the mesh of the fall prevention net N, and the fall prevention net N is stretched. At this time, as shown in FIG. 6, the locking plate 15 fixed to the lower left end portion of the outer cylinder 12 is locked to the center lower portion of the front plate 21 and the back plate 22 of the base portion 2, thereby The state extended | stretched horizontally from the base 2 is hold | maintained. This point is the same as when the clamp 32 is used (see FIG. 1).

  The vertical swing of the fall prevention net bracket A is prevented by the fixing operation itself of the wedge portion 31, but in addition to this, as shown in FIG. 6, it is related to the left side surface of the wedge portion 31 of the fixing portion 3. Since the left end of the bottom plate 43 of the stopper 4 is in the same position in plan view and abuts on the pipe P, the vertical swing of the fall prevention net bracket A is further prevented.

The horizontal swing of the fall prevention net bracket A is basically prevented by the fixing operation itself of the wedge portion 31. In addition to this, similarly to the case where the clamp 32 is used, the clamping end 41a of the clamping plate 41 of the locking portion 4 and the clamping end 42a of the clamping plate 42 clamp the pipe P, Further, since the left end of the bottom plate 43 is in contact with the pipe P, the horizontal swing of the fall prevention net bracket A is further prevented. This was also confirmed by experiments.

The operation of the fall prevention net bracket A according to the first embodiment of the present invention has been described in detail above. The fall prevention / BR> -net bracket A according to the first embodiment of the present invention has not only the fixing means for both the wedge part and the clamp, but also both the wedge part and the clamp as described above. Overcoming each and every problem that occurs when the fixing means is used and overhauling it one by one through experiments and thorough improvements, it has been completed to the point where it can actually demonstrate its effects in the field. The operational effects have been confirmed by applying the embodiments to actual sites.

That is, on the basis of having both the wedge portion and the clamp fixing means, essential indispensable constituent elements for solving a number of problems are integrated into this, and the invention is completed as a whole. I want to emphasize that it is a thing.

  The present invention was made first of all by an emergency request at the site of scaffold assembly. In other words, as mentioned above, the enforcement of the revised Industrial Safety and Health Regulations on June 1, 2009 has led to a sudden increase in demand for brackets for fall prevention nets, and the conventional products are either clamped or wedged. In the field where it was necessary to provide both the necessary number of both after all, the current situation is that they have a head on the calculation of the necessary number and the cost burden. Since both the clamp and the wedge can be used for the bracket for the fall prevention net of the present invention, the necessary number of calculations and the cost burden in the field are greatly reduced. Therefore, the bracket for the fall prevention net according to the present invention is expected to have a groundbreaking technical content in the scaffold assembling industry, and can provide a very useful prospect in future industrial applicability. I am sure it is.

DESCRIPTION OF SYMBOLS 1 Arm part 11 Inner cylinder 12 Outer cylinder 13 Hook 14 Screw 15 Locking plate 2 Base 21 Front plate 22 Back plate 23 Bolt 24 Hook 25 Left side plate 26 Clamp mounting part 27 Plate 3 Fixing part 31 Wedge part 31a Wedge base part 31b Wedge 32 Clamp 33 Hinge 33a Pivot 33b Support plate 33c Support plate 4 Locking part 41 Clamping plate 41a Clamping end part 42 Clamping plate 42a Clamping end part 43 Bottom plate A Fall prevention net bracket B Fall prevention net bracket B1 Arm part B11 Inner cylinder B12 Outer cylinder B13 Hook B14 Screw B15 Locking plate B2 Base B21 Front plate B22 Back plate B23 Bolt B24 Hook B3 Fixing portion B31 Wedge base B31a Top surface B32 Wedge B4 Locking portion B41 Locking plate B41a Locking plate B41a Locking plate B42a Locking end B43 Bottom plate C For fall prevention net Racket C1 Arm C2 Base C3 Fixed part CR Clamp Cr Gap D Fall prevention net bracket D2 Base D3 Fixed part D32 Wedge part Ds Spacing Da Step part Db Step part L1 Length L2 Distance M Worker N Fall prevention net P Pipe PS Wedge holder Q Pipe R direction SC Scaffolding W Wall surface X direction Y direction Z1 direction Z2 direction a Length c Gap d Step part e Gap φ Diameter

Claims (1)

A bracket for a fall prevention net for extending a fall prevention net provided in the gap between the scaffold for building construction and the building, that is, a net for preventing fall by extending between the scaffold and the wall surface of the building. The arm part to which the arm part is attached, the base part to which the arm part is attached, the fixing part having fixing means for fixing the base part to the pipe of the scaffold, and the locking of the role of stabilizing the fixing state to the pipe of the scaffold In the fall prevention net bracket having a portion, as a fixing means of the fixing portion, there are both a wedge portion fitted and fixed to the wedge receiver of the scaffolding pipe and a clamp wound and fixed to the scaffolding pipe, A structure that can be rotated horizontally so as not to collide with the pipe of the scaffold when not in use by being attached to the clamp mounting part provided integrally with the base via a hinge, and is composed of a sandwich plate and a bottom plate on both sides. Stop The length of the sandwiched end from the end of the bottom plate to the end of both sandwiched plates has an extension that is more than half of the diameter of the pipe of the scaffold, and the scaffolding at the sandwiched ends of the sandwiching plates on both sides A bracket for a fall prevention net, which is configured so that the pipe can be clamped and fixed, and a plate for placement is provided on the top of the clamp mounting portion.

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