JP5237883B2 - Frame scaffolding and frame scaffolding - Google Patents

Description

  The present invention relates to a framework scaffold for a construction site and the like, and a cross used in the framework scaffold.

  A frame scaffold used in a construction site or the like is usually formed by assembling a plurality of H-shaped or torii-shaped building frames composed of horizontal rails and vertical pillars by attaching streak or handrail frames. (For example, refer to Patent Document 1). In other words, a plurality of building frames are erected at right angles to a structure such as a building at a predetermined interval, and a plurality of building frames are installed by fixing a streak or a handrail frame between vertical columns of adjacent building frames. After making the frame self-supporting, one or two or more cloth frames with floors (also referred to as cloth plates) are bridged between the horizontal rails of adjacent building frames to form one unit of scaffolding. Next, a separately prepared building frame was erected on the building frame that had already been erected, and in the same manner, a streak and a handrail frame were attached and fixed between adjacent building frames, and then newly erected. A one-step scaffold is formed by laying one or more cloth frames with a floor on the horizontal rail of the building frame. By repeating this sequentially, the entire framework scaffolding is formed.

  An example of forming a framework scaffold using a torii-shaped building frame (hereinafter referred to as “torii frame”) is shown in FIG. (a) is a front view, (b) is a right side view.

  First, three torii frames 4 are arranged at equal intervals at right angles to the building 22, between the adjacent torii frames 4 and a streak 13 is attached to the lock fitting 8b on the opposite side of the building, and also on the building side. The first stage scaffolding is formed by attaching the strut 13 to the lock fitting 8a and allowing the first stage torii frame 4 to stand on its own. Thereafter, a floor-mounted cloth frame 11 serving as a second-stage scaffolding plate is bridged between the horizontal rails 3 at the upper part of the first-stage adjacent torii frame 4, and then the first-stage torii frame 4 already erected. The lower part of the vertical column 2 of the torii frame 4 prepared separately is placed on the vertical column 2 and fixed with a fixing pin (not shown), whereby the second stage torii frame 4 is erected. Thereafter, in the same manner as the first stage, the streak 13 is attached to the lock fitting 8b on the side opposite to the building, and the streak 13 is also attached to the lock fitting 8a on the building side, so that the second stage torii frame 4 The second stage scaffolding is formed by allowing the to stand independently. Thereafter, a floor-mounted cloth frame 11 serving as a third-stage scaffolding plate is bridged between the horizontal rails 3 on the upper side of the second-stage adjacent torii frame 4, and then the second-stage torii frame 4 already erected. The lower part of the vertical column 2 of the torii frame 4 prepared separately is placed on the vertical column 2 and fixed with a fixing pin (not shown), so that the third level torii frame 4 is erected. Thereafter, in the same manner as in the second stage, the streak 13 is attached to the lock fitting 8b on the opposite side of the building, and the strut 13 is also attached to the lock fitting 8a on the building side, and the third stage torii frame 4 A third-stage scaffolding is formed by allowing the to stand independently. In this way, the frame scaffold is formed until the required number of steps is reached.

  In addition, although the procedure which makes the frame of each step self-supporting by using a strut is described here, the frame of each step may be made self-supporting by replacing a part of the strut with a handrail frame.

  As another example of using a building frame, FIG. 2 shows an example of forming a frame scaffold using an H-shaped building frame (hereinafter referred to as “H frame”). (a) is a front view, (b) is a right side view.

  The three H frames 1 are arranged at equal intervals at right angles to the building 22, and the handrail frame 10 is attached to the lock fitting 6b on the opposite side of the building between the adjacent H frames. Make them independent. Further, the handrail frame 10 is attached to the lock fitting 7b on the side opposite to the building, and the building-side strut (diagonal material) 13 is attached to the lock fitting 7a and fixed. Thereafter, the cloth frame 11 with a floor is bridged between the horizontal rails 3 of the H frame 1 adjacent to the first stage to form a first stage scaffold. Next, the lower part of the vertical column 2 of the H frame 1 separately prepared is placed on the vertical column 2 of the first stage H frame 1 that has already been erected, and fixed with a fixing pin (not shown). Thus, the second stage H frame 1 is erected. Thereafter, in the same manner as the first stage, the handrail frame 10 is attached to the lock fittings 6b and 7b on the opposite side of the building, and the streak 13 is attached and fixed to the lock fitting 7a on the building side. A cloth frame 11 with a floor is bridged on the horizontal rail 3 of the H frame 1 of the eye to form a second stage scaffold. The third stage scaffolding is assembled in the same manner as the second stage scaffolding. That is, the handrail frame 10 is attached to the opposite side of the building, and the strut 13 is attached and fixed to the building side, and then the cloth frame 11 with a floor is laid over the horizontal rail 3 of the third-stage H frame 1. To form a third stage scaffold. In this way, the frame scaffold is formed until the required number of steps is reached.

  In addition, although the procedure which makes the frame of each step self-supporting by using a difference with a handrail frame was demonstrated here, a frame can be made self-supported only by a difference without using a handrail frame.

JP 2008-163740 A

  Thus, in the frame scaffold, a streak or a handrail frame is provided between the vertical columns of adjacent building frames.

  However, only the strut 13 is usually provided between the vertical columns on the building side, and a large space is formed between the strut 13 and the cloth frame 11 with a floor. For this reason, there is a risk that an operator may slide his or her foot from the space or fall.

  In addition, a similar space is often formed between the vertical columns on the opposite side of the building. In the frame scaffolding composed of the torii frame illustrated in FIG. 1, only the strut 13 is provided between the vertical columns on the side opposite to the building, and therefore, between the strut 13 and the cloth frame 11 with the floor. A large space is formed in. In the frame scaffolding composed of the H frame illustrated in FIG. 2, the handrail frame 10 is provided between the vertical columns on the opposite side of the building, so the space is smaller than the torii frame in FIG. 1. Depending on the frame pattern of the handrail frame 10 and the installation location, a large space may be formed. In addition, the handrail frame 10 is not necessarily installed, and may be replaced with the streak 13 as in FIG. Therefore, in order to solve such a problem, by reducing the space on the building side and the opposite side of the framework scaffold, it is possible to prevent the operator from slipping or falling from the space. It is required to take measures.

  As a measure for reducing the space on the building side and the opposite side of the framework scaffold, the first thing that comes to mind is to reduce the space by providing a lower rail or a middle rail in the space. In this case, if a handrail used conventionally is used as a lower rail or a middle rail, it is not necessary to develop a new member, and therefore, an increase in the cost of the frame scaffold can be suppressed.

  Conventionally, scaffolding components such as struts and handrails that are conventionally used have a flat plate shape in which both ends of a cylindrical pipe are crushed, and mounting holes formed in the flat plates at both ends are provided. It can be attached to the vertical column by hanging it on a lock fitting provided on the adjacent vertical column.

  FIG. 3 is a perspective view showing an example of a case where a lower pedestal is provided on the side opposite to the building of the frame scaffolding including a torii frame, and is a view of the frame scaffold from the upper part of the building.

  The handrail 30 as a lower rail is installed horizontally at a certain interval from the cloth frame 11 with a floor at the lower part of the vertical column 2 on the side opposite to the building of the adjacent torii frame 4. The handrail 30 has a flat plate shape in which both ends of a cylindrical pipe are crushed, and by attaching mounting holes formed in the flat plates at both ends to a lock fitting 8b provided in an adjacent vertical column. The handrail 30 can be attached between the adjacent vertical columns. Accordingly, two end portions of the left and right handrails 30 are attached to the lock fitting 8b below the vertical column 2 to which the handrail 30 is attached.

  However, two struts 13 are already diagonally attached between the vertical columns 2 on the side opposite to the building of the adjacent torii frame 4. The ends of the streaks 13 also have a flat plate shape formed by crushing both ends of the cylindrical pipe (the thickness is usually about 4.6 mm), and mounting holes drilled in the flat plates at both ends are provided. The striation 13 can be attached between the adjacent vertical columns by hanging on the lock fitting 8b provided on the adjacent vertical column. Therefore, two end portions of the left and right striations 13 are already attached to the lock fitting 8b below the vertical column 2 to which the handrail 30 is attached.

  In other words, two end portions of the left and right handrails 30 are attached to the lock fitting 8b provided at the lower portion of one vertical column, in addition to the two end portions of the left and right striations 13. become.

  FIG. 4 shows a state in which two end portions of the handrail 30 are attached to the lock fitting 8b provided at the lower portion of one vertical column in addition to the two end portions of the strut 13. Here, a spring movable claw portion 9 is provided at the distal end portion of the lock fitting 8b, and the four end portions attached to the lock fitting 8b cannot be removed unless an external force is applied. In FIG. 4, the claw portion 9 in a normal state is indicated by a solid line, and the claw portion 9 in a state of being pushed into the lock fitting 8b is indicated by a two-dot chain line.

  However, the thickness of the portion excluding the claw portion 9 of the existing lock fitting 8b is usually about 25.4 mm. However, since the lock fitting is normally attached to the vertical column by welding W, considering the thickness of the welding W (about 6 mm) and the play of attachment, the length that can be attached to the streak 13 and the end of the handrail 30 is long. The length is only about 16.8 mm. Therefore, in order to attach the two ends of the handrail 30 in addition to the two ends of the streak 13, it is necessary to use the lock fitting 8b that is sufficiently longer than the conventional one.

  However, in this case, since the existing lock fitting 8b cannot be used, it is necessary to newly produce the lock fitting 8b, and there is a problem that the cost of the frame scaffolding increases. In addition, when the length of the lock fitting 8b is increased, there is a problem that clothes, tools, etc. of workers are easily caught, which obstructs passage and work.

  The present invention has been made in order to solve the above-described problems, and includes an end fitting that can be attached to an existing lock fitting to which a different end is attached together with the different end. An object is to provide a frame scaffolding frame and a frame scaffolding provided with the frame scaffolding frame.

  In order to solve the above problems, the present inventors have repeatedly studied as shown in the following (a) to (c).

  (a) As described above, scaffolding components such as struts and handrails, including handrails as lower and middle rails, usually have a flat plate shape in which the ends of cylindrical pipes are crushed. Yes. Conventionally, this end has been formed by crushing both ends of a cylindrical pipe into a flat plate shape, but in this case, in addition to the end of the streak, the end of the lower beam or middle beam is formed. It cannot be installed. Therefore, the present inventors tried to reduce the thickness of the flat plate by separately manufacturing a thin flat plate and welding it to the end of a cylindrical pipe.

  (b) FIG. 5 is an example of a crosspiece formed by welding a flat plate to an end of a cylindrical pipe. Fig.5 (a) is a front view of the edge part of a crosspiece, FIG.5 (b) is a top view of the edge part of a crosspiece.

  The crosspiece 32 includes a cylindrical pipe 32a and a thin flat-plate end fitting 32b which is separately manufactured. The end fitting 32b is formed with a mounting hole 32c through which the lock fitting 8b is passed. A concave notch 32d is formed on one end of the end fitting 32b. The pipe 32a and the end fitting 32b are welded by a welded portion 32e in a state where the end of the pipe 32a is fitted into the notch 32d.

  Since the thin plate-shaped end fitting 32b is attached to the lock fitting 8b, the crosspiece 32 can use the existing lock fitting 8b. Therefore, it is not necessary to newly prepare the long lock fitting 8b, and the worker can perform traffic and work as usual.

  (c) However, there is a possibility that the following problems may occur in the crosspiece 32 as well.

  FIG. 6 is a cross-sectional view taken along line AA of the crosspiece 32 in FIG. As shown in FIG. 6A, immediately after the welding is properly performed, the outer peripheral surface of the pipe 32a and the end fitting 32b are completely joined by the welded portion 32e. Therefore, the pipe 32a and the end fitting 32b do not rattle. However, as shown in FIG. 6B, a crack may occur between the welded portion 32e and the end fitting 32b due to fatigue or the like due to long-term use. In this case, the pipe 32a and the end fitting 32b may rattle and the quality of the crosspiece 32 may be deteriorated.

  Based on such examination results, the present inventors have obtained useful knowledge for using existing lock fittings and improving the quality of the crosspieces as shown in the following (d) to (h).

  (d) In order to attach the crosspiece to the existing lock fitting, a thin plate-shaped end fitting made separately may be used.

  (e) In order to properly connect the thin flat-plate end fitting and the pipe, a notch into which the end of the pipe can be fitted may be formed in the end fitting. In addition, in order to prevent looseness between the thin flat-plate end fitting and the pipe and improve the quality of the crosspiece, while forming a flange on at least one of the arms formed on both sides of the notch, What is necessary is just to form the fitting hole which can fit the collar part in a pipe, and to fit a collar part to a fitting hole.

  (f) In order to prevent rattling between the end fittings and the pipe, it is possible to form a collar on both arms formed on both sides of the notch, and to fit the two collars Two fitting holes may be formed in the pipe, and the two flanges may be fitted into the two fitting holes. In addition, when forming two collar parts, it is necessary to shift and form one collar part with respect to the other collar part in the axial direction of a pipe.

  (g) In order to further suppress the backlash between the end fitting and the pipe, the arm portions formed on both sides of the notch and the outer peripheral surface of the pipe may be welded. In this case, even if a crack occurs in the welded portion, the movement of the end fitting is restricted by the welded portion, so that the play of the end fitting can be sufficiently suppressed.

  (h) In order to improve the strength (rigidity) of the thin flat-plate-shaped end fitting with the notch formed, a protrusion may be formed on the bottom surface of the notch. Moreover, what is necessary is just to form this protrusion part so that it may protrude in a pipe, when a pipe is fitted by the notch. In this case, the welding allowance of the end fitting can be expanded not only to the region outside the outer peripheral surface of the pipe but also to the protruding portion. Therefore, not only the outer peripheral surface of the pipe but also the end surface of the pipe can be reliably welded to the end fitting. Thereby, the strength (rigidity) of the end fitting in the vicinity of the contact surface with the end face of the pipe can be improved, and bending of the thin flat end fitting can be prevented.

  The present invention has been completed based on the above findings, and the gist of the present invention resides in the following framework scaffolding bars (1) to (4) and the framework scaffolding (5). Hereinafter, the present invention is collectively referred to as the present invention.

  (1) A crosspiece comprising a pipe and thin flat-plate end fittings attached to both ends of the pipe, each end fitting having a substantially concave notch into which the end of the pipe can be fitted. First and second arm portions extending in a direction parallel to the axial direction of the pipe on both sides of the notch, and a first flange formed so as to protrude to the notch side at the distal end portion of the first arm portion. And the pipe has a fitting hole into which the first flange of each end fitting can be fitted.

  (2) Each end fitting has a second collar portion formed so as to protrude toward the notch at the distal end portion of the second arm portion, and the second arm portion is formed from the first arm portion. The frame scaffolding beam according to (1) above, wherein the pipe has a fitting hole into which the second flange can be fitted.

  (3) The frame scaffolding beam according to (1), wherein the end fitting is formed on the bottom surface of the notch and has a protruding portion protruding into the pipe.

  (4) The frame scaffolding frame according to any one of (1) to (3) above, wherein the first and second arm portions of each end fitting and the outer peripheral surface of the pipe are welded.

  (5) A frame scaffold fixed by a strut, wherein both the end of the strut and the end of the frame scaffolding pedestal described in any of (1) to (4) above are building frames. A frame scaffolding that is attached to a common lock fitting provided on a vertical column.

  The frame scaffolding frame comprising a thin flat plate-shaped end fitting according to the present invention can be attached to an existing lock fitting to which a different end is attached together with the different end, and the quality of the crosspiece Improvements can be made.

It is an example which forms a frame scaffold using a torii frame. It is an example which forms a frame scaffold using H frame. It is a perspective view which shows an example at the time of providing a lower rail in the frame scaffolding which consists of a torii frame. A state in which two different end portions and two end portions of a handrail are attached to a lock fitting provided at the lower portion of one vertical column is shown. It is an example of a crosspiece formed by welding a thin flat-plate end fitting to an end of a cylindrical pipe. FIG. 6 is a cross-sectional view of the crosspiece in FIG. 5. It is a figure which shows an example of the frame scaffold based on this invention. It is a 1st example of a crosspiece concerning the present invention. It is an enlarged view which shows the one end part of the crosspiece of FIG. It is a figure for demonstrating the connection method of a pipe and an edge part metal fitting. It is a figure which shows the state when a crack generate | occur | produces between an arm part and a welding part. It is a 2nd example of the crosspiece which concerns on this invention. It is a 3rd example of a crosspiece concerning the present invention. It is a figure for demonstrating the connection method of the pipe of the crosspiece of a 3rd example, and an end metal fitting.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a frame for a scaffold according to an embodiment of the present invention (hereinafter, abbreviated as a beam) and a frame scaffold provided with the frame will be described with reference to the drawings.

(1) First Example FIG. 7 is a diagram showing an example of a framework scaffold according to the present invention. The frame scaffold 50 shown in FIG. 7 is different from the frame scaffold shown in FIG. 3 in that a crosspiece 40 is provided instead of the handrail 30. FIG. 7 shows a part of the frame scaffold 50. Actually, like the frame scaffold shown in FIG. 1, the framework is composed of a plurality of torii frames 4 and a plurality of cloth frames 11 with floors. A scaffold 50 is configured. In FIG. 10, for the sake of simplicity, only the crosspiece 40 provided on one side of the frame scaffold 50 is shown, but the crosspiece 40 is similarly provided on the other side of the frame scaffold 50.

  FIG. 8 is a view showing the crosspiece 40 of FIG. 7 (first example of the crosspiece according to the present invention). In FIG. 8, (a) is a front view, and (b) is a top view.

  As shown in FIG. 8, the crosspiece 40 according to the present embodiment includes a cylindrical pipe 41 and a thin flat plate-shaped end fitting 42. The thickness of the end fitting 42 is, for example, 3.6 mm or less. This crosspiece 40 is used as a lower crosspiece or an intermediate crosspiece like the handrail 30 described in FIG.

  FIG. 9 is an enlarged view showing one end portion of the crosspiece 40 of FIG. 9A is a front view of the crosspiece 40, and FIG. 9B is a longitudinal sectional view in a direction parallel to the axial direction of the crosspiece 40. FIG.

  As shown in FIG. 9, an attachment hole 43 through which the lock fitting 8 b (see FIG. 7) passes is formed on one end side of the end fitting 42. As shown in FIG. 9B, a substantially concave notch 44 is formed on the other end side of the end fitting 42, and long arm portions 42 a are formed on both sides of the notch 44. . As shown in FIG. 9B, a flange 46 is formed at the tip of one arm 42a so as to protrude toward the notch 44 side. The pipe 41 is formed with a fitting hole 47 into which the flange portion 46 can be fitted. In addition, it is preferable that the length of the arm part 42a is 10 mm-40 mm, for example. In this crosspiece 40, the arm part 42a in which the collar part 46 is formed is an example of the first arm part in the claims, and the collar part 46 is an example of the first collar part.

  In the present embodiment, the pipe 41 and the end fitting 42 are connected by fitting the end of the pipe 41 into the notch 44 and fitting the flange 46 into the fitting hole 47. In this state, the pipe 41 and the end fitting 42 are welded by the welded portion 45. As a welding method, various methods such as arc welding or gas welding can be used.

  The pipe 41 and the end fitting 42 are connected as described below. FIG. 10 is a view for explaining a method of connecting the pipe 41 and the end fitting 42. FIG. 10 shows a cross-sectional view perpendicular to the axial direction of the pipe 41.

  When connecting the pipe 41 and the end fitting 42, first, as shown in FIG. 10A, the pipe 41 is fixed so that the fitting hole 47 faces the horizontal direction, and the end fitting 42 is attached. Inclined by about 45 ° with respect to the horizontal direction, the corner (tip) of the flange 46 enters the fitting hole 47. Then, as shown in FIG. 10B, the flange portion 46 is caused to enter the fitting hole 47 until the side surface of the flange portion 46 comes into contact with the outer edge of the fitting hole 47. Thereafter, as shown in FIGS. 10C and 10D, the end fitting 42 is fixed in a substantially horizontal direction. In the state of FIG. 10D, the pipe 41 and the end fitting 42 are welded.

  In the present embodiment, since the flange portion 46 is fitted in the fitting hole 47, even if a crack occurs between the arm portion 42a and the welded portion 45 as shown in FIG. Further, rattling of the thin flat end fitting 42 can be prevented.

  Further, in the present embodiment, the distance d (see FIG. 9) between the flange portion 46 and the arm portion 42 a facing the flange portion 46 is set to be smaller than the outer diameter of the pipe 41. Therefore, in order to remove the end fitting 42 from the pipe 41, the flange 46 must be pulled out from the fitting hole 47 while the end fitting 42 is inclined with respect to the pipe 41, but a crack is generated in the weld 45. Even in this case, the inclination angle of the end fitting 42 is limited by the welded portion 45, so that the end fitting 42 can be reliably prevented from being detached from the pipe 41.

  As a result, the quality of the crosspiece 40 can be sufficiently improved.

  Further, in the crosspiece 40 according to the present embodiment, since the thin flat-plate-shaped end fitting 42 is used, two struts 13 and two crosspieces 40 are formed by the conventional lock fitting 8b (FIG. 10). Can be fixed to the frame scaffold. Therefore, since it is not necessary to produce a new lock fitting 8b for attaching the crosspiece 40, an increase in the manufacturing cost of the frame scaffold can be suppressed. Moreover, since it is not necessary to crush the pipe 41 when joining the pipe 41 and the end fitting 42, the workability of the crosspiece 40 is improved. Further, there is no need to newly prepare a long lock fitting 8b, and the worker can perform traffic and work as usual.

  In addition, when the pipe 41 is fitted to the notch 44, the distance between the outer peripheral surface of the pipe 41 and the arm part 42a is preferably 0.2 mm to 1.0 mm, for example. Further, the distance d (see FIG. 9) between the flange portion 46 and the arm portion 42 a facing the flange portion 46 is preferably set to be 1.2 mm to 7.0 mm smaller than the outer diameter of the pipe 41. .

(2) Second Example The crosspiece of the second example differs from the crosspiece 40 of the first example in the following points.

  FIG. 12 is a view showing a second example of the crosspiece according to the present invention. FIG. 12 is an enlarged view showing one end portion of the crosspiece 40a of the second example, (a) is a front view of the crosspiece 40a, and (b) is a direction parallel to the axial direction of the crosspiece 40a. It is a longitudinal cross-sectional view.

  As shown in FIG. 12B, in the present embodiment, a protruding portion 42 b protruding into the pipe 41 is formed on the bottom surface portion of the notch 44 of the thin flat plate-shaped end fitting 42. A gap for fitting the tip of the pipe 41 is formed between the arm part 42a and the protruding part 42b. In addition, when the pipe 41 is fitted to the notch 44, the distance between the outer peripheral surface of the pipe 41 and the arm part 42a is preferably 0.2 mm to 1.0 mm, for example. The gap between the arm portion 42a and the protruding portion 42b is preferably set appropriately according to the thickness of the pipe 41. For example, when the thickness of the pipe 41 is 1.9 mm, the gap is 2.3 mm to 4 mm. 0.0 mm is preferred. Moreover, it is preferable that the length which protrudes in the pipe 41 side of the protrusion part 42b is 4 mm or more, for example. The width of the protruding portion 42b is preferably a length obtained by removing 0.4 mm to 2.0 mm from the inner diameter of the pipe 41, for example.

  As shown in FIG. 12 (b), in the crosspiece 40a according to the present embodiment, the pipe is welded by the welded portion 45 in a state where the end of the pipe 41 is fitted in the gap between the arm portion 42a and the protruding portion 42b. 41 and the end fitting 42 are welded. Here, since the protrusion 42b is formed in the end fitting 42 according to the present embodiment, the welding allowance of the end fitting 42 is not limited to the region outside the outer peripheral surface of the pipe 41 but also to the protrusion 42b. Can be enlarged. Therefore, not only the outer peripheral surface of the pipe 41 and the arm portion 42 a but also the end surface and inner peripheral surface of the pipe 41 can be welded to the end fitting 42. In this case, since the arm portion 42a and the protruding portion 42b are connected by the welded portion 45 and the pipe 41, the strength (rigidity) of the end fitting 42 in the vicinity of the contact surface with the end surface of the pipe 41 can be improved. Therefore, even when a large load is applied to the end fitting 42 when the frame scaffold is disassembled or when the crosspiece 40a is transported, the thin flat end fitting 42 can be prevented from being bent.

  In the above description, the case where the inner surface of the pipe 41 is welded to the end fitting 42 has been described. However, the welding method between the pipe 41 and the end fitting 42 is not limited to the above example. For example, if the end surface of the pipe 41 is welded to the end fitting 42, the inner surface of the pipe 41 may not be welded to the end fitting 42. Even in this case, the strength (rigidity) of the end fitting 42 in the vicinity of the contact surface with the end face of the pipe 41 can be improved, so that the end fitting 42 can be prevented from being bent.

(3) Third Example The crosspiece of the third example is different from the crosspiece 40 of the first example in the following points.

  FIG. 13 is a view showing a third example of the crosspiece according to the present invention. FIG. 13 is an enlarged view showing one end portion of the crosspiece 40b of the third example, (a) is a front view of the crosspiece 40b, and (b) is a direction parallel to the axial direction of the crosspiece 40b. It is a longitudinal cross-sectional view.

  As shown in FIG. 13, in the present embodiment, a collar portion 46 is formed on one arm portion 42a, and a collar portion 48 is similarly formed on the other arm portion 42a. The length of the arm portion 42a on which the collar portion 48 is formed is shorter than the length of the arm portion 42a on which the collar portion 46 is formed. The pipe 41 is formed with a fitting hole 47 into which the flange portion 46 can be fitted and a fitting hole 49 into which the flange portion 48 can be fitted. The fitting hole 49 is formed on the end face side of the pipe 41 with respect to the flange portion 48. In this crosspiece 40b, the arm part 42a in which the collar part 48 is formed is an example of the second arm part in the claims, and the collar part 48 is an example of the second collar part.

  In the present embodiment, the pipe 41 and the end fitting 42 are connected by fitting the flange portions 46 and 48 into the fitting holes 47 and 49. In this state, the pipe 41 and the end fitting 42 are welded by the welded portion 45.

  The pipe 41 and the thin flat end fitting 42 are connected as described below. FIG. 14 is a diagram for explaining a method of connecting the pipe 41 and the end fitting 42.

  As shown in FIG. 14A, in the present embodiment, first, the end portion of the pipe 41 is cut out so that the flange portion 48 is fitted into the fitting hole 49 closer to the end surface of the pipe 41. 44. Thereafter, as shown in FIG. 14B, the flange portion 46 is fitted into the fitting hole 47 while the pipe 41 is rotated (twisted). In the state of FIG. 14B, the pipe 41 and the end fitting 42 are welded.

  In the present embodiment, since the flange portions 46 and 48 are fitted in the fitting holes 47 and 49, even if a crack occurs between the arm portion 42a and the welded portion 45, the pipe 41 and the end portion Shaking of the metal fitting 42 can be prevented. Also in the crosspiece 40b, as in the crosspiece 40 according to the first example, in order to remove the end fitting 42 from the pipe 41, the fitting hole 47 is inclined while the end fitting 42 is inclined with respect to the pipe 41. 49, the flange portions 46 and 48 must be pulled out from the pipe 41, so that even if a crack occurs in the welded portion 45, the end fitting 42 is prevented from tilting by the welded portion 45. It can be reliably prevented from coming off.

  As a result, the quality of the crosspiece 40b can be sufficiently improved.

  The frame scaffolding frame comprising a thin flat plate-shaped end fitting according to the present invention can be attached to an existing lock fitting to which a different end is attached together with the different end, and the quality of the crosspiece Improvements can be made.

DESCRIPTION OF SYMBOLS 1 H frame 2 Vertical pillar 3 Horizontal beam 4 Torii frame 6b Lock metal fitting 7a Lock metal fitting 7b Lock metal fitting 8a Lock metal fitting 8b Lock metal fitting 9 Claw part 10 Handrail frame 11 Cloth frame with floor 13 Stitch 22 Building 30 Handrail 32 Crosspiece 32a Pipe 32b End fitting 32c Mounting hole 32d Notch 32e Welding portion 33 End fitting 33a Protruding portion 40 Crossing 40a Crossing 40b Crossing 41 Pipe 42 End fitting 42a Arm part 42b Protruding part 43 Mounting hole 44 Notch 45 Welding part 46 Welding part 47 Fitting hole 48 buttock 49 Fitting hole 50 Frame scaffold W weld

Claims (5)

A crosspiece comprising a pipe and a thin flat-plate end fitting attached to both ends of the pipe,
Each end fitting is
A substantially concave notch into which the end of the pipe can be fitted; and
First and second arms extending in a direction parallel to the axial direction of the pipe on both sides of the notch;
A first collar portion formed so as to protrude to the notch side at a tip portion of the first arm portion;
The frame scaffolding bar, wherein the pipe has a fitting hole into which the first flange of each end fitting can be fitted. Each end fitting has a second collar portion formed so as to protrude toward the notch at the tip of the second arm portion, and the second arm portion is the first arm portion. The frame scaffolding bar according to claim 1, wherein the pipe has a fitting hole into which the second flange portion can be fitted. 2. The frame scaffolding frame according to claim 1, wherein the end fitting is formed on a bottom surface of the notch and has a protruding portion protruding into the pipe. The frame scaffolding beam according to any one of claims 1 to 3, wherein the first and second arm portions of each end fitting and the outer peripheral surface of the pipe are welded. It is the frame scaffold fixed by the strut, Comprising: Both the edge part of a strut and the edge part of the frame scaffolding frame in any one of Claims 1-4 were provided in the vertical column of the building frame A frame scaffolding which is attached to a lock fitting of

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