JP4176094B2 - Auxiliary handrails for misuse of crossed frames in frame scaffolding - Google Patents

Description

  The present invention relates to an auxiliary handrail adapted to be detachably and horizontally laid across a crossing line made of a pair of diagonal members stretched between building frames of a frame scaffold.

  As shown in FIG. 8, in the frame scaffold constructed in the construction site, an X-shaped cross bar composed of a pair of diagonal members 2 a and 2 a between the building frames 1 and 1 along both longitudinal sides of the scaffold plate 3. Since the difference 2 is bridged over, the crossing difference 2 becomes a safety fence, and the worker who crosses the scaffold board 3 can be secured. However, as can be seen from the figure, the crossing difference 2 is such that the lower side is open in a substantially triangular shape with the scaffold plate 3, so that the operator can There was a risk of accidental fall from the triangular opening when working with a middle waist. Therefore, in order to prevent such a risk, the auxiliary handrail 24 is horizontally bridged over the diagonal members 2a and 2a forming the lower triangular opening of the crossing line 2.

Although the illustration of the conventional auxiliary handrail 24 is omitted, for example, as described in Patent Document 1, it is composed of a single bar-shaped handrail body having a constant length. There are hooking means each consisting of a hook or the like at both ends, and by hooking the hooking means on an oblique material with different crossing bars, the bar-shaped handrail body can be detachably mounted horizontally across the crossing bars. I have to.
Japanese Patent No. 3004944

  As described above, the conventional auxiliary handrail consists of a bar-shaped handrail body with a fixed length, but the dimensions of building frames and crossing lines vary slightly from manufacturer to manufacturer, and these dimensions are inch sizes. Therefore, when using the auxiliary handrail, there is a problem that it is impossible to accurately attach the bar-shaped handrail body to the desired height position when attaching it to the diagonal material with crossed bars. It was.

  In view of the above-described problems, the present invention is configured such that the handrail body can be adjusted to be expanded and contracted, so that the handrail body can be accurately attached to a desired height position with respect to an oblique material having different crossing bars. The purpose is to provide an auxiliary handrail.

Means for solving the above-described problems will be described with reference numerals in the embodiments described later. An auxiliary handrail for cross-strut misuse of the frame scaffold of the invention according to claim 1 is a building frame 1 of the frame scaffold. In an auxiliary handrail that is detachably mounted horizontally on a crossing line 2 composed of a pair of diagonal members 2a, 2a stretched between 1 and 2, the handrail body 5 is fitted in a nested manner. together constituting telescopically by a plurality of bar-like members 6 and 7 for engagement, Ri Na provided fixing means 8 for fixing the rod-like members 6 and 7 to the required expansion position, the both end portions of the balustrades body 5 A first hook 9 that is substantially L-shaped in a side view and is hooked on the upper side surface portion of the diagonal member 2a, and is positioned closer to the outer end than the first hook 9 on the lower side surface portion of the diagonal member 2a. A second hook 10 having an L-shape that is substantially upward in side view and is hooked is provided. Click 10, with its base shaft portion 10a is rotatably inserted and supported freely vertically moved around the axis in the balustrades body 5, normally is characterized by being urged upward by a spring 11.

  In a second aspect of the present invention, the fixing means 8 is screwed into the end of the large-diameter bar-like member 6 in an inward radial direction from the surface side. It is characterized by comprising a fixing bolt 8a pressed against the surface of the small diameter side bar-shaped member 7 fitted into the large diameter side bar-shaped member 6.

According to a third aspect of the present invention, in the auxiliary scaffolding for crossing bars used in the frame scaffold according to the second aspect of the present invention, a concave groove 19 into which the fixing bolt 8a slidably enters the surface of the small-diameter bar member 7 in a longitudinal direction. However, it is characterized in that it is formed over the entire length, leaving the end portion 7a to be fitted into the large-diameter side bar-shaped member 6.

  According to a fourth aspect of the present invention, in the auxiliary handrail for crossing bars used in the frame scaffolding according to the third aspect, a concave formed on the surface of the small-diameter side bar-shaped member 7 is formed at the end of the large-diameter side bar-shaped member 6. A bar-shaped member retaining tool 16 that protrudes so as to face the groove 19 is provided.

The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the invention according to claim 1, a plurality of bar-like members that fit the handrail body 5 in a nested manner. 6 and 7 are configured to be extendable and retractable, and are provided with a fixing means 8 for fixing the rod-like members 6 and 7 to a required expansion / contraction position. If the auxiliary handrail 4 is attached to the diagonal members 2a, 2a of the crossing line 2, the length of the handrail main body 5 is reduced. by stretching adjusted appropriately, it is possible to quickly easily and accurately mounted fixed to the slant members 2a, the desired height of 2a. That is, when the attachment height of the handrail body 5 with the first hooks 9 and 9 hooked is higher than a desired position, the handrail body 5 is appropriately extended to increase the length thereof. The handrail main body 5 can be lowered to a desired mounting height in a horizontal posture, and when the handrail main body 5 has a lower mounting height than a desired position, the handrail main body 5 is appropriately contracted. By shortening the length, the handrail body 5 can be raised to a desired mounting height in a horizontal posture.
Further, according to the present invention, first hand hooks 9 having a substantially downward L-shape in a side view and hooked on the upper side surface of the diagonal member 2a of the crossing line 2 are respectively attached to both ends of the handrail main body 5. A second hook 10 having a substantially upward L-shape in a side view is provided, which is positioned closer to the outer end than the hook 9 and is hooked to the lower side portion of the diagonal member 2a. Since the sliding body 5 is inserted and supported so as to be movable in the vertical direction and rotatable about the axis line, and is always urged upward by the spring 11, the auxiliary handrail 4 for the diagonal members 2 a, 2 a of the crossing line 2 is used. The mounting operation can be performed easily and easily.

  According to the second aspect of the present invention, the fixing means 8 is screwed into the end of the large-diameter side bar-shaped member 6 inwardly in the radial direction from the surface side, and is fitted into the large-diameter side bar-shaped member 6. Since the bolt 8a is pressed against the surface of the small bar member 7, the structure is simple and the manufacturing is easy, the operation is simple, and the expansion and contraction adjustment of the handrail body 5 is easy.

  According to the third aspect of the present invention, the concave groove 19 into which the fixing bolt 8a is slidably inserted in the longitudinal direction on the surface of the small-diameter side bar-shaped member 7 is fitted into the large-diameter side bar-shaped member 6. Since the end portion 6a is left (forms a non-grooved portion), the fixing bolt 8a is loosened when the rod-like members 6 and 7 adjust the expansion and contraction of the handrail body 5 having a cylindrical shape. By sliding along the concave groove 19 in the state, the concave groove 19 becomes a guide groove, the large-diameter side rod-shaped member 6 and the small-diameter side rod-shaped member 7 do not rotate relative to each other, and the expansion / contraction operation becomes easy. Further, when the handrail main body 5 is adjusted for expansion and contraction, if the fixing bolt 8a is loosened and is allowed to enter the concave groove 19, the fixing bolt 8a can be moved into the concave groove 19 when the rod-like members 6 and 7 are extended to the maximum. Since it is caught in the end portion (non-groove portion), the rod-like member can be prevented from coming out.

  According to the invention which concerns on Claim 4, the rod-shaped member removal prevention tool 16 which protrudes in the edge part of the large diameter side rod-shaped member 6 so that it may face the ditch | groove 19 formed in the surface of the small diameter side rod-shaped member 7 is provided. Even when the fixing bolt 8a is detached from the large-diameter side bar-shaped member 6 or is screwed to such an extent that the bolt 8a does not protrude from the inner peripheral surface of the large-diameter side bar-shaped member 6. Further, it is possible to reliably prevent the rod-shaped member from being pulled out when the handrail main body 5 is expanded and contracted.

  FIG. 1A is a partial cross-sectional front view of the crossbar misuse auxiliary handrail 4 according to the present invention, FIG. 1B is a bottom view of the auxiliary handrail 4, and FIG. 1C is a side view of the auxiliary handrail 4. FIG. The auxiliary handrail 4 is composed of a handrail main body 5 that is configured to be extendable and contractable by two large-diameter and small-diameter bar-like members 6 and 7 that are nested with each other. , 7 are fixed to a required expansion / contraction position by a fixing means 8. The crossing line 2 to which the auxiliary handrail 4 is attached is composed of a pair of diagonal members 2a, 2a intersecting in an X shape, and both ends of each diagonal member 2a are vertical members 1a of the building frame 1 of the frame scaffold. It is pivotally attached to. The fixing means 8 includes a butterfly bolt 8a.

  The bar-shaped members 6 and 7 constituting the handrail main body 5 are each made of a steel pipe material. One end (outer end) of the large-diameter side bar-shaped member 6 has an upper side surface portion of the diagonal member 2a having a crossing line 2 A first hook 9 having a substantially downward L-shape as viewed from the side, which is hooked on the left side, and a substantially upward L-shape as viewed from the side, which is positioned closer to the outer end than the first hook 9 and is hooked on the lower side surface of the diagonal member 2a. The second hook 10 is inserted into the second hook 10 so that its base shaft portion 10a penetrates the handrail main body 5 in the vertical direction and is movable in the vertical direction and rotatable about the axis. While being supported, it is normally biased upward by the coil spring 11. Further, a fixing means 8 is provided at the other end portion (inner end portion) of the large-diameter side bar-like member 6 so as to fix both the bar-like members 6 and 7 at a required expansion / contraction position.

  FIG. 2 shows the large-diameter bar member 6 of the handrail main body 5 and the first hook 9 attached thereto, (a) is a front view, (b) is a bottom view, and (c) is a side view. is there. The first hook 9 is fixed in a substantially downward L-shape in side view by welding the lower end portion of the base shaft portion 9a through the end required portion of the large-diameter bar member 6 and welding. A through-hole 12 through which the base shaft portion 10a of the second hook 10 passes is provided at one end of the large-diameter bar-shaped member 6, and the handrail body 5 is accommodated at the lower side of one end of the large-diameter bar-shaped member 6. A fitting hole 13 is provided for fitting the leading end raised portion 10b of the second hook 10 during storage or the like. A nut 14 to which the butterfly bolt 8a of the fixing means 8 is screwed is fixed to the lower surface of the other end portion (inner end portion) of the large-diameter bar-like member 6 by welding. A bolt insertion hole 15 is provided in the screw hole 20 on the front side of the bolt insertion hole 15, as shown in FIGS. 1A and 1B, a rod-shaped member retaining member 16 made of a screw. It is screwed and the front-end | tip part protrudes from the internal peripheral surface of the large diameter side rod-shaped member 6. FIG.

  As shown in FIG. 4, the second hook 10 has a first horizontal portion 10c extending at a right angle from the lower end portion of the base shaft portion 10a, and a second horizontal portion 10d extending forward at a right angle from the first horizontal portion 10c. The tip upright portion 10b rises in parallel with the base shaft portion 10a from the tip of the second horizontal portion 10d. A screw 10 o into which the nut 17 is screwed is provided at the upper end portion of the base shaft portion 10. In order to attach the second hook 10 to one end (outer end) of the large-diameter bar-shaped member 6, the second hook 10 is inserted into the through-hole 12 at one end of the large-diameter bar-shaped member 6 shown in FIG. After inserting the base shaft portion 10a of the hook 10 upward, the coil spring 11 is fitted into the base shaft portion 10a from above, and the nut 17 is screwed to the upper end portion of the base shaft 10a.

  FIG. 3 shows a small-diameter bar-like member 7 of the handrail body 5 and a first hook 9 attached thereto. (A) is a front view, (b) is a bottom view, and (c) is a view of (a). It is XX sectional drawing. An end pipe member 18 made of a steel pipe having the same diameter as that of the large diameter side rod-shaped member 6 is coaxially attached to one end portion (outer end portion) of the small diameter side rod-shaped member 7. The first hook 9 and the second hook 10 on the side bar-shaped member 7 side are attached to the positions facing the first hook 9 and the second hook 10 on the large-diameter side bar-shaped member 6 side in the same manner as those. (See FIG. 1).

  That is, as can be seen from FIGS. 3 (a) to 3 (c), the butterfly bolt 8a (fixing bolt) of the fixing means 8 is slidable in the longitudinal direction on the lower surface of the small-diameter bar-shaped member 7. The indented groove 19 is formed over the entire length, leaving the end portion 7a fitted into the large-diameter bar-like member 6 by a required length (that is, forming a non-groove portion in the end portion 7a). ing. Then, one end portion of the end tube member 18 is externally fitted to the end portion of the small diameter side rod-like member 7 opposite to the non-groove portion, and is fixed integrally by welding, for example. A first hook 9 is attached to the end tube member 18, and a through hole 12 through which the base shaft portion 10 a of the second hook 10 passes is provided at the other end portion of the end tube member 18. A fitting hole 13 for fitting the tip upright portion 10b of the second hook 10 at the time of storing and storing the handrail main body 5 is provided on the lower side surface of the one end portion. The attachment of the second hook 10 to the end pipe member 18 is the same as in the case of the large diameter side rod-shaped member 6. In FIGS. 3A to 3C, reference numeral 21 denotes an opening for welding when the end tube member 18 is welded and fixed to the small-diameter bar member 7.

  As shown in FIG. 7 or in the same manner as in FIG. 8 showing the prior art, the crossing misuse auxiliary handrail 4 configured as described above is stretched between the building frames 1 and 1 of the frame scaffolding. A method of attaching the auxiliary handrail 4 will be described below.

  When the auxiliary handrail 4 is not in use, the second hook 10 is set at a storage position as schematically shown by an imaginary line in FIG. That is, after the base shaft portion 10a of the second hook 10 is pushed down against the coil spring 11 from the position indicated by the solid lines in FIGS. 1A and 1C as shown in the phantom line, the base shaft portion 10a is moved around its axis. The tip upright portion 10b is fitted into the fitting hole 13 of the large-diameter side bar-shaped member 6, and the small-diameter side bar-shaped member 7 is fitted into the fitting hole 13 of the end tube member 18. Set it in the storage position. When not in use, the butterfly bolt 8a as the fixing means 8 is loosened and the small-diameter bar member 7 is pushed into the large-diameter bar member 6 to keep the handrail body 5 in a contracted state. In this contracted state, the wing bolt 8a is tightened, and the large-diameter side bar-shaped member 6 and the small-diameter side bar-shaped member 7 are integrally fixed to each other. By setting it in such a storage state, the auxiliary handrail 4 as a whole becomes short and compact, which is convenient for packing, storage, storage and transportation.

  In order to attach the auxiliary handrail 4 to the diagonal members 2a, 2a having the crossing bars 2, first, the butterfly bolts 8a of the fixing means 8 are loosened, and the small-diameter bar member 7 is replaced with the large-diameter bar member 6. Then, the butterfly bolt 8a is tightened to fix the handrail body 5 in the extended state. From this state, as shown in FIG. 7, the handrail main body 5 is brought close to the diagonal members 2a and 2a in a horizontal posture, and the first hooks 9 and 9 having L-shapes substantially downward in side view at both ends of the handrail main body 5 are provided. The diagonal members 2a and 2a are hooked from above.

  At this time, if the mounting height of the handrail body 5 with the first hooks 9 and 9 hooked is higher than the desired position, the handrail body 5 is appropriately extended to increase its length. Thus, the handrail main body 5 can be lowered to a desired mounting height in a horizontal posture, and when the handrail main body 5 has a lower mounting height than a desired position, the handrail main body 5 is appropriately contracted. Then, by shortening the length, the handrail body 5 can be raised to a desired mounting height in a horizontal posture.

  Thus, if the mounting height of the handrail body 5 is set to a desired value with the first hooks 9 and 9 being hooked on the diagonal members 2a and 2a, the base shaft portion 10a of each second hook 10 is biased by the coil spring 11. The top end 10b of the second hook 10 is pulled out from the fitting hole 13, and then the base shaft portion 10a of the second hook 10 is rotated about 90 ° outward about its axis, If the depressed base shaft portion 10a is released, the base shaft portion 10a is lifted and restored by the coil spring 11, and as shown in FIGS. 5 and 6, the second horizontal portions 10d, 10d abuts against the lower side surfaces of the diagonal members 2a, 2a, and the tip uprights 10b, 10b abut against the outer surface portions of the diagonal members 2a, 2a, whereby the handrail body 5 is inclined to the diagonal member 2a. , 2a in a horizontal position Of it is held and fixed in height.

  When removing the auxiliary handrail 4 attached to the crossing line 2 as described above, the base shaft portion 10a of each second hook 10 is pushed down against the coil spring 11 and the tip upright portion 10b is moved to the handrail body 5. If the handrail body 5 is lifted in a state in which the base shaft portion 10a is rotated inwardly about 90 ° around the axis, the auxiliary handrail 4 is tilted at a crossing angle. It can be easily removed from the materials 2a, 2a.

  After the auxiliary handrail 4 is removed from the cross bar 2, as described above, the tip upright portion 10 b of each second hook 10 is engaged with the handrail body 5 fitting hole 13, and each second hook 10 is moved. It fixes to the state accommodated in the handrail main body 5, and the handrail main body 5 is contracted and fixed.

  According to the auxiliary handrail 4 as described above, the handrail main body 5 is configured to be extendable and retractable by a plurality of rod-like members 6 and 7 that are nested with each other. Since the fixing means 8 for fixing at the required expansion / contraction position is provided, the dimensions of the building frame 1 and the crossing bars 2 are different for each manufacturer, and those dimensions are inch size or meter size. Even so, when attaching the auxiliary handrail 4 to the diagonal members 2a, 2a of the crossing line 2, by adjusting the length of the handrail body 5 appropriately, the desired height position of the diagonal members 2a, 2a Can be fastened easily and accurately.

  Further, in the auxiliary handrail 4, the fixing means 8 is screwed into the end portion of the large-diameter side bar-shaped member 6 inward in the radial direction from the surface side, and is fitted into the large-diameter side bar-shaped member 6. Since it consists of butterfly bolts 8a pressed against the surface of the side bar-shaped member 7, the structure is simple and the manufacture is easy, the operation is simple, and the expansion and contraction adjustment of the handrail body 5 can be performed quickly and easily. The butterfly bolt 8a is convenient because the head of the bolt has a butterfly shape and the bolt can be easily tightened and loosened manually.

  Further, in the auxiliary handrail 4, a concave groove 19 into which the butterfly bolt 8 a is slidably inserted in the longitudinal direction is formed on the surface of the small-diameter side bar-shaped member 7. Since it is formed over the entire length leaving the portion 6a (forming a non-grooved portion), the butterfly bolt 8a, that is, the fixing bolt, is used when the rod-like members 6 and 7 adjust the expansion and contraction of the handrail body 5 having a cylindrical shape. By sliding the groove 8a along the concave groove 19, the concave groove 19 becomes a guide groove, and the large-diameter side rod-like member 6 and the small-diameter side rod-like member 7 do not rotate relative to each other, so that the expansion / contraction operation can be performed. It becomes easy. Further, when the handrail main body 5 is adjusted to extend and contract, if the fixing bolt 8a is loosened and inserted into the concave groove 19, the fixing bolt 8a can be moved into the concave groove 19 when the rod-like members 6 and 7 are extended to the maximum extent. Since it is caught by the edge part (non-groove part), the other rod-shaped member does not come out from one rod-shaped member.

  Further, in the auxiliary handrail 4 of this embodiment, the rod-shaped member retaining member that protrudes so as to face the concave groove 19 formed on the surface of the small-diameter side rod-shaped member 7 at the end of the large-diameter side rod-shaped member 6. 16 is provided, the fixing bolt 8a is removed from the nut 14 attached to the large-diameter side bar-shaped member 6, and the bolt 8a does not protrude from the inner peripheral surface of the large-diameter side bar-shaped member 6. Even if the handrail main body 5 is telescopically operated, the rod-like member can be prevented from being pulled out.

  Further, in this auxiliary handrail 4, a first hook 9 having a substantially downward L-shape in a side view, which is hooked on the upper side surface of the diagonal member 2 a having crossing bars 2, is provided at both ends of the handrail main body 5. The second hook 10 is provided with a second hook 10 that is positioned closer to the outer end than the first hook 9 and is hooked to the lower side surface portion of the diagonal member 2a. Since the portion 10a is inserted and supported by the handrail main body 5 so as to be movable in the vertical direction and to be rotatable about the axis, and is always urged upward by the spring 11, the diagonal material 2a having the cross streak 2 as described above. , 2a can be easily and easily attached.

  In the above embodiment, the handrail main body 5 has been described as being composed of two bar-shaped members, the large-diameter side bar-shaped member 6 and the small-diameter side bar-shaped member 7, but the handrail main body of the auxiliary handrail 4 according to the present invention. 5 may be composed of three or more rod-shaped members.

  In the embodiment, the rod-shaped members 6 and 7 are each formed by a member having a circular cross section, but the rod-shaped members 6 and 7 can be formed by a non-circular member having a cross-sectional shape such as a quadrangle.

  Further, in the auxiliary handrail 4 of the embodiment, an end tube member 18 made of a steel pipe material having the same diameter as that of the large-diameter side bar-shaped member 6 is coaxially and integrally attached to one end portion (outer end portion) of the small-diameter side bar-shaped member 7. The first hook 9 and the second hook 10 on the small diameter side rod-shaped member 7 side are attached to the end tube member 18, but such a small diameter side rod-shaped member 7 is not used without using the end tube member 18. You may make it attach the 1st hook 9 and the 2nd hook 10 directly to one end part (outer end part). However, as in this embodiment, by attaching an end tube member 18 made of a steel pipe material having the same diameter as that of the large-diameter side bar-shaped member 6 to one end portion (outer end portion) of the small-diameter side bar-shaped member 7, The first and second hooks 9 and 10 having the same dimensions can be attached to both ends of the main body 5, so that the manufacturing cost of the first hook 9 and the second hook 10 can be reduced and the handrail main body 5 can be manufactured. Installation work becomes easy.

(a) is a partial cross-sectional front view of an auxiliary handrail for crossing use according to the present invention, (b) is a bottom view of the auxiliary handrail, and (c) is a side view of the auxiliary handrail. The large diameter side bar-shaped member of a handrail main body and the 1st hook attached to this are shown, (a) is a front view, (b) is a bottom view, (c) is a side view. The small diameter side rod-shaped member of a handrail main body and the 1st hook attached to this are shown, (a) is a front view, (b) is a bottom view, (c) is XX sectional drawing of (a). . The second hook is shown, (a) shows a crossbar misuse auxiliary handrail according to the present invention, (a) is a perspective view, (b) is a front view, (c) is a plan view, ( d) is a side view, and (e) is a coil spring fitted to the base shaft portion of the second hook. It is a perspective view which shows the state which attached the one end part side of the handrail main body to the diagonal material with different crossing bars. It is a perspective view which shows the state which attached the other end part side of the handrail main body to the diagonal material with different crossing bars. It is a schematic front view which shows the state which attached the auxiliary handrail to the crossing straddle stretched between building frames. It is a schematic perspective view which shows the mounting state of the auxiliary handrail to a crossing line difference.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building frame of frame scaffold 2 Crossing difference 2a Diagonal material 3 Scaffold plate 4 Auxiliary handrail 5 Handrail main body 6 Large diameter side rod-shaped member 7 Small diameter side rod-shaped member 8 Fixing means 8a Butterfly bolt (fixing bolt)
9 First hook 10 Second hook 11 Coil spring 16 Bar-shaped member retaining tool 19 Concave groove

Claims (4)

Auxiliary handrails that are detachably mounted horizontally across a pair of diagonal members stretched between building frames of a frame scaffolding, and the handrail bodies are nested in each other. together constituting telescopically by a plurality of bar-like members, Ri name provided fixing means for fixing the rod member to a required expansion position, said respective at both end portions of the handrail main body, the upper surface portion of the diagonal member A first hook substantially L-shaped in a side view, which is hooked on the second side, and a second hook in a substantially upward L-shape in side view, which is positioned closer to the outer end than the first hook and is hooked on the lower side surface of the diagonal member. The second hook has a base shaft portion that is vertically supported by the handrail body so as to be movable in the vertical direction and rotatable about the axis, and is always urged upward by a spring. Auxiliary handrail for cross-strut misuse of the framework scaffolding.   The fixing means includes a fixing bolt that is screwed into the end of the large-diameter bar-shaped member inwardly in the radial direction from the surface side and pressed against the surface of the small-diameter bar-shaped member that fits in the large-diameter bar-shaped member. The auxiliary railing for cross-strutage misuse of a frame scaffold according to claim 1.   On the surface of the small-diameter side bar-shaped member, a concave groove into which the fixing bolt is slidably inserted in the longitudinal direction is formed over the entire length, leaving an end portion to be fitted into the large-diameter side bar-shaped member. The auxiliary handrail for cross-strut misuse of the frame scaffold according to claim 2.   The rod-shaped member retaining member that protrudes so as to face a concave groove formed on the surface of the small-diameter side bar-shaped member is provided at an end of the large-diameter side bar-shaped member. Auxiliary handrails for cross-strut misuse of the framework scaffold described in 1.

Images