Temporary scaffolding joints and temporary scaffolding

Abstract

To provide a joint horizontal material for a temporary scaffold capable of suppressing the generation of noise, being attached to and detached from a column or a horizontal material, and capable of enhancing work efficiency in assembling and dismantling the temporary scaffold, and to provide the temporary scaffold.SOLUTION: There is provided a joint 3 of a joint horizontal material 2A for a temporary scaffold includes an engagement portion 31 engaged with a joint support portion 41 of a column 4, and a slide lock portion 32 slidable between a lock position 301 and an unlock position. When the slide lock portion 32 is in the lock position 301, the engagement portion 31 is prevented from coming off the joint support portion 41. When the slide lock portion 32 is at the unlocked position, a base end portion of the slide lock portion 32 is engaged with an upper surface of the joint horizontal material 2A.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a joint cross member for temporary scaffolding and a temporary scaffolding. [Background technology]

[0002] Temporary scaffolding that is easy to assemble and dismantle is used when carrying out exterior wall construction, interior construction, structural construction, etc. of various buildings. Temporary scaffolding is formed by suspending cross members across multiple supports and placing treads on the cross members. For example, as described in Patent Document 1, the supports are provided with multiple support parts having insertion holes on all four sides around the central axis of the support at equal intervals in the axial direction, and both ends of the cross members are provided with insertion parts that are inserted into the insertion holes of the support parts of the supports.

[0003] When assembling the temporary scaffolding shown in Patent Document 1 and the like, the cross member is struck with a hammer or the like to firmly insert the insertion portion into the insertion hole of the support part of the column so that the insertion portion does not easily come out. Also, when dismantling the temporary scaffolding, it is necessary to strike the cross member with a hammer or the like when pulling out the insertion portion from the insertion hole. Therefore, noise is generated when striking the cross member with a hammer or the like.

[0004] In the hook for the temporary cross member shown in Patent Document 2, the gripping part of the temporary cross member is hooked onto a horizontal round member, and the gripping part is prevented from coming off the horizontal round member by a spring-biased retaining part. This hook structure does not generate noise when assembling and dismantling the temporary scaffolding, and prevents the temporary cross member from floating up from the horizontal round member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-60140 A [Patent Document 2] JP 2008-8052 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in order to assemble and dismantle the temporary scaffolding without generating noise and with high work efficiency, the temporary cross members described in Patent Document 2 and the like are insufficient. In this case, further improvements are required in the structure of the cross members.

[0007] The present invention has been made in consideration of such problems, and aims to provide a joint cross member for temporary scaffolding and temporary scaffolding that can be attached and detached between posts or cross members while suppressing noise generation, and that can increase the work efficiency of assembling and dismantling the temporary scaffolding. [Means for solving the problem]

[0008] The first aspect of the present invention is A joint support portion of a support column constituting a temporary scaffolding, or a joint horizontal member provided with a joint supported by a horizontal member constituting the temporary scaffolding, The joint includes an engaging portion that is formed on the outside of the longitudinal end of the joint cross member, extends from the end and intersects with the longitudinal direction, and engages with the joint support portion or the cross member; a slide lock portion configured to slide by gravity at a position facing the engagement portion on the inside in the longitudinal direction, The slide lock portion is a locking position in which, under gravity, a base end of the slide locking portion is accommodated on an upper surface of the joint cross member and a tip end of the slide locking portion is engaged with a lower end of the joint support portion or a lower end of the cross member, thereby preventing the engagement portion from coming off the joint support portion or the cross member; The base end of the slide lock portion is engaged with the upper surface of the joint cross member, and the tip end of the slide lock portion is slidable to a lower end of the joint support portion or an unlocked position away from the lower end of the cross member. the law of nature, The joint has an accommodation recess on an upper surface of the joint cross member in which a base end of the slide lock portion in the locked position is accommodated, and a hook portion on an upper surface of the joint cross member in which a base end of the slide lock portion in the unlocked position is hooked, The joint has a shaft portion perpendicular to both the longitudinal direction and an engagement direction of the engagement portion, The accommodating recess is formed on the upper surface of the joint cross member in a state where it is open at both ends in a width direction perpendicular to the longitudinal direction, The slide lock portion has a plate-shaped grip portion at a base end of the slide lock portion, which is accommodated in the accommodation recess in a state where it is exposed above the accommodation recess and to a pair of sides, and which can be gripped by an operator, and an extension portion which extends from the grip portion in a state where it is inclined obliquely downward in the engagement direction so as to approach the engagement portion, and which is engaged with a lower end portion of the joint support portion or a lower end portion of the cross member, The extension portion has a long hole for sliding formed therein, the long hole being inclined obliquely downward in the engagement direction when the shaft portion is inserted therethrough. There are temporary joint cross members for temporary scaffolding. A second aspect of the present invention is a joint support part of a support column constituting a temporary scaffolding, or a joint horizontal member provided with a joint supported by a horizontal member constituting the temporary scaffolding, The joint includes an engaging portion that is formed on the outside of the longitudinal end of the joint cross member, extends from the end and intersects with the longitudinal direction, and engages with the joint support portion or the cross member; a slide lock portion configured to slide by gravity at a position facing the engagement portion on the inside in the longitudinal direction, The slide lock portion is a locking position in which, under gravity, a base end of the slide locking portion is accommodated on an upper surface of the joint cross member and a tip end of the slide locking portion is engaged with a lower end of the joint support portion or a lower end of the cross member, thereby preventing the engagement portion from coming off the joint support portion or the cross member; The base end of the slide lock portion is engaged with the upper surface of the joint cross member, and the tip end of the slide lock portion is slidable to a lower end of the joint support portion or an unlocked position away from the lower end of the cross member, The joint has an accommodation recess on an upper surface of the joint cross member in which a base end of the slide lock portion in the locked position is accommodated, and a hook portion on an upper surface of the joint cross member in which a base end of the slide lock portion in the unlocked position is hooked, The engagement portion of the joint is configured to be engaged with an upper surface of the cross member, The joint cross member is constituted by a step member having a step provided on an upper surface of a rectangular frame member, The engagement portion is provided at one or more of the longitudinal ends of the step member. , as a joint cross member for temporary scaffolding.

[0009] The present invention 3 The aspect is A temporary scaffolding comprising a joint horizontal member for the temporary scaffolding, a plurality of pillars provided with the joint support portion, and a step plate fixed or placed on an upper surface of the joint horizontal member, The joint is provided at one end or both ends in the longitudinal direction of the joint cross member, The joint cross member is in a temporary scaffolding that is supported in a cantilevered state by the joint support portions of the multiple pillars by the joint at one end, or supported in a double-supported state by the joints at both ends by the joint support portions of the multiple pillars.

[0010] The present invention 4 The aspect is A temporary scaffolding including a plurality of joint horizontal members for the temporary scaffolding and a plurality of posts provided with the joint support portions, The plurality of support columns are installed at nine locations, including a central location on the installation surface, four corner locations located on all four sides around the central location, and four intermediate locations between adjacent corner locations; The joint support portion is provided in a state where it is arranged at a predetermined dimensional interval within a range of 200 to 260 mm in the axial direction of the plurality of the pillars, The joint cross member is integrated with the tread plate and is supported by the joint support portion of the central support column and the joint support portion of the corner support column and the joint support portion of the intermediate support column, which are adjacent to each other. The joint cross member is formed in a right-angled triangular shape having a pair of the joints and auxiliary engagement portions at the corners, The multiple joint cross members are located in a temporary scaffolding in which a pair of the joints and auxiliary engagement portions are supported by the joint support portion of the central position support column, the joint support portions of the adjacent corner position supports, and the joint support portions of the intermediate position supports, which are positioned in succession in the upper tier, with the corner position supports and the intermediate position supports being supported in succession alternately in a circumferential direction around the central position support column, thereby forming a spiral staircase. Effect of the Invention

[0011] (First aspect And the second aspect (Joint cross member) The first aspect And the second aspect The joint horizontal member is suitable for assembling and dismantling temporary scaffolding. The joint of the joint horizontal member has an engagement part that engages with the joint support part of the support column or the horizontal member, and a slide lock part that prevents the engagement part from coming off. The slide lock part is designed to slide between a locked position and an unlocked position.

[0012] Here, the cross member may be a joint cross member or a cross member different from the joint cross member. For example, the cross member may be a cross member having an engagement portion but not having a slide lock portion.

[0013] Specifically, when assembling the temporary scaffolding, the engagement portion of the joint of the joint cross member is engaged with the joint support portion or cross member. In the process of the engagement portion engaging with the joint support portion or cross member, the slide lock portion does not need to be operated in particular. In other words, in the process of the engagement portion engaging with the joint support portion or cross member, the slide lock portion abuts against the joint support portion or cross member, floats up while moving away from the engagement portion, and then descends due to gravity. This allows the engagement portion to be easily engaged with the joint support portion or cross member.

[0014] Then, the base end of the slide lock part is received on the upper surface of the joint cross member, and the tip end of the slide lock part is engaged with the lower end of the joint support part or the lower end of the cross member. The slide lock part is maintained in the locked position by gravity, thereby preventing the engagement part from coming off the joint support part or the cross member.

[0015] This configuration of the slide lock portion allows the joint cross member to be efficiently attached to the support or cross member while suppressing noise generation.

[0016] On the other hand, when dismantling the temporary scaffolding, first, the slide lock part is slid from the locked position to the unlocked position to retract the slide lock part from the engaging part. Then, the slide lock part is made not to hinder the release of the engagement of the engaging part with the joint support part or the cross member. Next, the engaging part can be easily removed from the joint support part or the cross member by lifting the joint cross member. Therefore, the joint cross member can be efficiently removed from the support or cross member while suppressing the generation of noise.

[0017] Thus, the first aspect And the second aspect According to the joint cross member for temporary scaffolding, noise generation can be suppressed and attachment and detachment can be performed between the posts or cross members, thereby improving the work efficiency of assembling and dismantling the temporary scaffolding.

[0018] (Part 3 (Temporary scaffolding of various types) The above 3 The temporary scaffolding of the present embodiment is assembled using the joint cross members, the posts and the treads of the first embodiment. 3 According to the temporary scaffolding of this embodiment, noise generation can be suppressed and the work efficiency of assembling and dismantling the temporary scaffolding can be improved.

[0019] (Part 4 (Temporary scaffolding of various types) The above 4The temporary scaffolding of the present embodiment is one in which the joint horizontal member of the first embodiment is integrated with a tread plate and assembled using a plurality of supports. A pair of joints having an engagement portion and a slide lock portion, and an auxiliary engagement portion, which are supported by the joint support portions of the three supports, are formed at the right-angled triangular corners of the joint horizontal member of this embodiment. The pair of joints and the auxiliary engagement portion of the right-angled triangular joint horizontal member are supported by the joint support portions of the central support, the adjacent corner support, and the intermediate support among the plurality of supports. In addition, the joint support portions of the two supports on which two of the pair of joints and the auxiliary engagement portions are supported in the multiple joint horizontal members are sequentially changed to the upper step in a circumferential direction around the central support, while the corner support and the intermediate support are sequentially replaced. Thus, a spiral staircase is formed.

[0020] The above 4 According to the temporary scaffolding of this embodiment, noise generation can be suppressed and the work efficiency of assembling and dismantling a spiral staircase using the temporary scaffolding can be improved. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a perspective view showing a joint cross member as a frame member according to the first embodiment. [Diagram 2] FIG. 4 is a cross-sectional view showing the joint cross member with the slide lock portion in the locked position according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the joint cross member in the first embodiment, in which the slide lock portion is in an intermediate position between the locked position and the unlocked position. [Diagram 5] FIG. 4 is a cross-sectional view showing the joint cross member with the slide lock portion in the unlocked position according to the first embodiment. [Figure 6] FIG. 2 is an explanatory diagram showing a cross section of the temporary scaffolding according to the first embodiment as viewed from the front. [Figure 7] FIG. 2 is an explanatory diagram showing a cross section of the temporary scaffolding according to the first embodiment, as viewed from the side. [Figure 8]FIG. 2 is a perspective view showing a joint cross member as a frame member supported by a support in a cantilever state in the first embodiment. [Figure 9] FIG. 2 is a perspective view showing a state in which a joint cross member serving as a tread member is spanned across a joint cross member supported by a support column in a cantilevered state in the first embodiment; [Figure 10] FIG. 2 is a perspective view showing a joint cross member as a frame member supported by pillars in a double-supported state in the first embodiment. [Figure 11] FIG. 2 is a perspective view showing a state in which a joint cross member serving as a tread member is spanned across a joint cross member supported by a support pillar in a double-supported state in the first embodiment; [Figure 12] FIG. 4 is an explanatory diagram showing a case in which a support member is provided at the upper end of a support according to the first embodiment. [Figure 13] FIG. 11 is a perspective view showing a joint cross member as a tread member according to a second embodiment. [Figure 14] FIG. 11 is a cross-sectional view showing a joint cross member as a tread member in accordance with a second embodiment, with the slide lock portion in a locked position. [Figure 15] FIG. 11 is a cross-sectional view showing another joint cross member as a tread member in accordance with the second embodiment, with the slide lock portion in the locked position. [Figure 16] FIG. 11 is an explanatory diagram showing a joint cross member as a frame member according to a third embodiment. [Figure 17] FIG. 11 is an explanatory diagram showing a temporary scaffolding for forming a straight staircase using joint cross members according to a third embodiment. [Figure 18] FIG. 11 is a perspective view showing a temporary scaffolding for forming a spiral staircase using joint cross members according to a fourth embodiment. [Figure 19] FIG. 11 is an explanatory diagram showing a temporary scaffolding forming a spiral staircase according to a fourth embodiment, as viewed from above. [Figure 20] FIG. 17 is a view taken along the arrow XVII in FIG. 15 , showing a temporary scaffolding forming a spiral staircase according to a fourth embodiment. [Figure 21] FIG. 11 is an explanatory diagram showing a temporary scaffolding forming a spiral staircase according to a fourth embodiment, viewed from above, excluding the steps. [Figure 22]FIG. 11 is a perspective view showing a right-angled triangular joint cross member constituting a temporary scaffolding using a spiral staircase according to a fourth embodiment. [Diagram 23] FIG. 13 is a perspective view showing a joint support portion of a support column, which is formed by four rotatable support blocks, according to a fifth embodiment. [Figure 24] FIG. 13 is an explanatory diagram showing a part of a support column provided with a joint support part made of four rotatable support blocks according to a fifth embodiment. [Diagram 25] FIG. 11 is an explanatory diagram showing a temporary scaffolding formed using a joint support part made up of four rotatable support blocks according to a fifth embodiment. [Figure 26] FIG. 13 is an explanatory diagram showing a state in which a joint cross member is supported by one support block in a joint support portion according to a fifth embodiment. [Figure 27] FIG. 13 is an explanatory diagram showing a retrofit support supported by a joint cross member as a frame member according to a sixth embodiment. [Figure 28] FIG. 13 is an explanatory diagram showing a plan view of a temporary scaffolding having a protruding scaffolding portion formed using a retrofit support according to a sixth embodiment. [Figure 29] FIG. 13 is an explanatory diagram showing another retrofit support supported by a joint cross member as a frame member according to the sixth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Preferred embodiments of the above-mentioned joint cross member for temporary scaffolding and temporary scaffolding will be described with reference to the drawings. <Embodiment 1> As shown in Figs. 1 to 5, the joint horizontal member 2A for temporary scaffolding in this embodiment is provided with a joint 3 supported by a joint support part 41 of a support column 4 constituting the temporary scaffolding 1. The joint 3 of the joint horizontal member 2A has an engagement part 31 and a slide lock part 32. The engagement part 31 is formed on the outer side of the end part in the longitudinal direction X of the joint horizontal member 2A, extending from the end part in the longitudinal direction X of the joint horizontal member 2A and intersecting with the longitudinal direction X, and is configured to be engaged with the joint support part 41. The slide lock part 32 is configured to slide by gravity to a position facing the inside of the engagement part 31 in the longitudinal direction X.

[0023] The slide lock part 32 can slide between a locked position 301 and an unlocked position 302. As shown in Fig. 2 and Fig. 3, when the slide lock part 32 is in the locked position 301, the slide lock part 32 is subjected to gravity, and the base end of the slide lock part 32 is accommodated in the upper surface of the joint horizontal member 2A, and the tip end of the slide lock part 32 is engaged with the lower end of the joint support part 41, thereby preventing the engagement part 31 from coming off the joint support part 41. As shown in Fig. 5, when the slide lock part 32 is in the unlocked position 302, the base end of the slide lock part 32 is engaged with the upper surface of the joint horizontal member 2A, and the tip end of the slide lock part 32 is separated from the lower end of the joint support part 41.

[0024] The joint horizontal member 2A for temporary scaffolding and the temporary scaffolding 1 of this embodiment will be described in detail below. (Temporary scaffolding 1, joint cross members 2A, 2B) 6 and 7, the temporary scaffolding 1 is temporarily set up to carry out construction work such as exterior wall construction, interior construction, and framework construction of various buildings 5. The temporary scaffolding 1 is formed by arranging joint horizontal members 2A in a row across multiple supports 4 in the horizontal direction, and arranging the joint horizontal members 2A at predetermined intervals in the vertical direction of the multiple supports 4.

[0025] In the temporary scaffolding 1, the direction equivalent to the vertical direction is called the height direction H, the direction equivalent to the horizontal direction that is parallel to the wall surface of the building 5 or the like is called the length direction L, and the direction equivalent to the horizontal direction that is perpendicular to the wall surface of the building 5 or the like is called the depth direction D.

[0026] In the joint cross member 2A, the longitudinal direction X refers to the direction in which the joint cross member 2A is formed long. The engagement direction Z in this embodiment refers to a direction perpendicular to the longitudinal direction X and oriented vertically. The width direction Y in this embodiment refers to a direction perpendicular to both the longitudinal direction X and the engagement direction Z. The axial direction of the support 4 is the same as the engagement direction Z.

[0027] The joint horizontal members 2A, 2B may be used in the form of either a frame member (beam member) 2A not provided with a tread 20 or a tread member 2B provided with a tread 20. As shown in Fig. 8, the joint horizontal member 2A as a frame member may have a joint 3 at one end or both ends in the longitudinal direction X, and may be supported by a joint support part 41 of the column 4 in a cantilevered state by the joint 3 at one end or one of the joints 3. Also, as shown in Fig. 10, the joint horizontal member 2A as a frame member may have a joint 3 at both ends in the longitudinal direction X, and may be supported by a joint support part 41 of the column 4 in a double-supported state by the joints 3 at both ends.

[0028] 9 and 11, when the joint cross member 2B is integrated with the tread 20 and used as the tread member 2B, one or more engagement parts 31 and slide lock parts 32 may be provided at the end of the joint cross member 2B in the longitudinal direction X in a direction perpendicular to the longitudinal direction X. In this case, the engagement part 31 of the joint cross member 2B as the tread member is supported by the joint cross member 2A supported by the joint support part 41 of the support column 4, and the slide lock part 32 of the joint cross member 2B is engaged with the lower end part of the joint cross member 2A supported by the joint support part 41 of the support column 4.

[0029] As shown in Figs. 6 to 9, the temporary scaffolding 1 may be configured as a one-sided scaffolding by supporting a plurality of horizontal joint members 2A in a cantilevered state in the depth direction D on the joint support parts 41 of a plurality of columns 4 aligned in the length direction L relative to the building 5. Also, as shown in Figs. 10 and 11, the temporary scaffolding 1 may be configured as a frame scaffolding by supporting a horizontal joint member 2A in a both-end supported state in the depth direction D on the joint support parts 41 of a plurality of columns 4 aligned in the length direction L and the depth direction D relative to the building 5. Also, the temporary scaffolding 1 may be configured as a straight staircase, a folded staircase, a spiral staircase, etc., by using various horizontal joint members 2A. Also, in the temporary scaffolding 1, reinforcing members, handrails, etc. are appropriately provided.

[0030] (post 4) 6 to 9, the pillar 4 is used standing upright in the height direction H, and is made of a pipe member having a plurality of joint supports 41 provided at equal intervals in the axial direction. The plurality of joint supports 41 are provided lined up at predetermined intervals within a range of 200 to 260 mm in the axial direction of the pillar 4. A base plate 45 having a jack-up portion formed thereon for adjusting the position of the pillar 4 in the height direction H is attached to the lower end of the pillar 4.

[0031] 2, 4, 5, 8 and 9, the joint support parts 41 arranged in the axial direction of the support pillar 4 have four insertion holes 42 formed in four directions at equal intervals around the central axis of the support pillar 4 and parallel to the height direction H. In the joint support part 41, a locking notch part 421 is formed in the lower part of the wall part forming the insertion holes 42 so that the tip part of the slide lock part 32 can be locked.

[0032] (Joint 3) As shown in Figs. 1 to 4, the joint horizontal member 2A of this embodiment is formed as a frame member such as a rod-shaped member. The joint 3 having an engagement portion 31 and a slide lock portion 32 is formed at both ends of the longitudinal direction X of the joint horizontal member 2A. The joint horizontal member 2A is composed of a tubular member 21 having an upper surface portion 211, a pair of side portions 212, and a lower surface portion 213, and a tip member 22 joined to the end of the tubular member 21 in the longitudinal direction X. The tip member 22 is made of a material thicker than the thickness of the tubular member 21, and is joined to the end of the tubular member 21 in the longitudinal direction X by welding or the like. The engagement portion 31 and slide lock portion 32 of the joint 3 are provided on the tip member 22.

[0033] The joint 3 formed by the tip member 22 is provided with an axis portion 23 perpendicular to both the longitudinal direction X and the engagement direction Z of the engagement portion 31, an accommodation recess 24 on the upper surface of the joint cross member 2A for accommodating the base end of the slide lock portion 32 in the locked position 301, and a hook portion 25 on the upper surface of the joint cross member 2A for hooking the base end of the slide lock portion 32 in the unlocked position 302. The engagement portion 31, the axis portion 23, the accommodation recess 24 and the hook portion 25 are formed in the tip member 22, and the slide lock portion 32 is disposed on the tip member 22 so as to be slidable.

[0034] 2 and 3, a notch 215 is formed at the end of the cylindrical member 21 in the longitudinal direction X by cutting out the upper surface portion 211 and the pair of side surface portions 212, and the tip member 22 is disposed in the notch 215. The tip member 22 is formed in an L shape by a base portion 221 disposed in the notch 215 and an engagement portion 31 bent relative to the base portion 221.

[0035] The engaging portion 31 is formed at the end of the longitudinal direction X of the joint cross member 2A by bending downward in the height direction H from the end of the base portion 221. The engaging portion 31 is configured to be inserted from above into the insertion hole 42 of the joint support portion 41 of the pillar 4. The tip portion of the engaging portion 31 located on the inside in the longitudinal direction X is formed in a tapered shape.

[0036] As shown in Figs. 1 to 3, the shaft portion 23 is formed as a guide when the slide lock portion 32 is slid. The shaft portion 23 is provided on a shaft support portion 231 that protrudes in the engagement direction Z (downward) from the base portion 221 of the tip member 22. In this embodiment, the shaft portion 23 is supported by the pair of shaft support portions 231 in a double-supported state. The accommodation recess 24 is formed on the upper surface of the joint cross member 2A in a state in which it is open on both ends in the width direction Y perpendicular to the longitudinal direction X. The accommodation recess 24 is formed on the upper surface of the base portion 221 of the tip member 22 over the entire length of the width direction Y in a state parallel to the width direction Y.

[0037] The hooking portion 25 is formed on the upper surface of the tip member 22 in a state parallel to the accommodating recess 24 and open on both ends in the width direction Y. The hooking portion 25 is formed on the upper surface of the base portion 221 of the tip member 22 over the entire length in the width direction Y in a state parallel to the width direction Y. The hooking portion 25 is formed by a V-shaped groove having a V-shaped cross section so that the corner of the base end portion of the slide lock portion 32 is hooked. In addition, the base portion 221 of the tip member 22 is formed with an insertion hole 222 through which the extension portion 322 is inserted. The hooking portion 25 by the V-shaped groove is formed on both sides of the insertion hole 222 in the width direction Y.

[0038] 2 to 5, the slide lock part 32 has a plate-shaped grip part 321 that can be gripped by an operator, and an extension part 322 that extends from the grip part 321. The grip part 321 is provided at the base end part of the slide lock part 32, and is housed in the accommodating recess 24 in a state where it is exposed above the accommodating recess 24 and on both sides. The thickness of the grip part 321 in the engagement direction Z is approximately the same as the depth of the accommodating recess 24 in the engagement direction Z. The extension part 322 is formed in the slide lock part 32 in the locked position 301 so as to be inclined obliquely downward in the engagement direction Z from the lower surface of the grip part 321 so as to approach the engagement part 31.

[0039] The tip of the extension portion 322 is engaged with an engagement notch 421 at the lower end of the joint support portion 41. The extension portion 322 is formed with an elongated hole 323 for sliding through which the shaft portion 23 is inserted. The elongated hole 323 is formed long in a direction substantially parallel to the formation direction of the extension portion 322. The slide lock portion 32 is slidable by utilizing the elongated hole 323.

[0040] The slide lock portion 32 is configured so that, when the engaging portion 31 is inserted into the insertion hole 42 of the joint support portion 41, the tip portion of the extending portion 322 abuts against the upper end portion of the joint support portion 41. When the tip portion of the extending portion 322 abuts against the joint support portion 41, the slide lock portion 32 is configured to move away from the engaging portion 31 and rise up.

[0041] 1 and 3, the cylindrical member 21 of the joint cross member 2A has a high rigidity due to a simple change in the cross-sectional shape. Specifically, a downward protruding portion 214 that protrudes downward compared to both side portions in the width direction Y is formed continuously in the longitudinal direction X in the central portion of the lower surface portion 213 of the cylindrical member 21 in the width direction Y perpendicular to the longitudinal direction X. The cross section of the cylindrical member 21 perpendicular to the longitudinal direction X has a shape in which the central portion of the lower surface portion 213 in the rectangular shape formed by the upper surface portion 211, the pair of side surface portions 212, and the lower surface portion 213 protrudes downward.

[0042] The width of the extension portion 322 of the slide lock portion 32 in the width direction Y is smaller than the width between the inner faces of the downward protrusion portion 214 of the tubular member 21 in the width direction Y. A part of the tip side of the extension portion 322 of the slide lock portion 32 in the locked position 301 is disposed within the downward protrusion portion 214. The position of the slide lock portion 32 in the width direction Y is guided by the downward protrusion portion 214.

[0043] 1, the joint cross member 2A may be provided with a cover 33 for preventing the slide lock portion 32 from sliding from the locked position 301 to the unlocked position 302. The cover 33 is configured to cover the grip portion 321 of the slide lock portion 32 and be hooked onto the tubular member 21.

[0044] If the thickness of the extension portion 322 of the slide lock portion 32 is reduced, there is a risk that the grip portion 321 will get caught around the hook portion 25 of the tip member 22 due to rattling of the slide lock portion 32. In this case, as shown by the dashed lines in FIG. 1, chamfered portions 324 may be provided at the four corners of the grip portion 321 of the slide lock portion 32.

[0045] As shown in FIG. 12, the joint horizontal member 2A as a framework member may be arranged at the upper end of the support 4 so that the upper end of the support 4 hardly protrudes upward from the joint horizontal member 2A as a framework member and the joint horizontal member 2B as a step member. Specifically, a reduced diameter portion 441 having a reduced diameter from the general portion is formed at the upper end of the support 4. Then, a support member 44 provided with a joint support portion 41 is attached to this reduced diameter portion 441 so that the joint support portion 41 of the support member 44 is arranged near the upper end of the support 4. This makes it possible to make the upper end of the support 4 hardly protrude upward from the joint horizontal members 2A and 2B, so that the upper end of the support 4 does not get in the way of a worker walking on the joint horizontal member 2B.

[0046] (Action and effect) The joint horizontal member 2A of this embodiment is suitable for assembling and dismantling the temporary scaffolding 1. The joint 3 of the joint horizontal member 2A has an engagement part 31 that engages with the joint support part 41 of the support column 4, and a slide lock part 32 that prevents the engagement part 31 from coming off. The slide lock part 32 is designed to slide between a locked position 301 and an unlocked position 302.

[0047] Specifically, when assembling the temporary scaffolding 1, the engagement portion 31 of the joint 3 of the joint cross member 2A is engaged with the joint support portion 41. In the process of the engagement portion 31 engaging with the joint support portion 41, the slide lock portion 32 does not need to be particularly operated. That is, in the process of the engagement portion 31 engaging with the joint support portion 41, the slide lock portion 32 abuts against the joint support portion 41, floats up while moving away from the engagement portion 31, and then descends due to gravity. This allows the engagement portion 31 to be easily engaged with the joint support portion 41.

[0048] Thereafter, the gripping portion 321 of the slide lock portion 32 is accommodated in the accommodation recess 24 on the upper surface of the joint cross member 2A, and the tip portion of the extension portion 322 of the slide lock portion 32 is engaged with the engagement notch portion 421 on the lower end portion of the joint support portion 41. Then, the slide lock portion 32 is maintained in the lock position 301 by gravity, so that the engagement portion 31 is prevented from coming off the joint support portion 41.

[0049] Such a configuration of the slide lock portion 32 makes it possible to efficiently attach the joint cross member 2A to the support column 4 while suppressing the generation of noise.

[0050] On the other hand, when dismantling the temporary scaffolding 1, first, the slide lock part 32 is slid from the lock position 301 to the unlock position 302, and the slide lock part 32 is retracted from the engagement part 31. Then, the slide lock part 32 is prevented from hindering the release of the engagement of the engagement part 31 with the joint support part 41. Next, the engagement part 31 can be easily removed from the joint support part 41 by lifting the joint cross member 2A. Therefore, the joint cross member 2A can be efficiently removed from the support 4 while suppressing the generation of noise.

[0051] In this way, according to this embodiment of the joint cross member 2A for temporary scaffolding, noise generation can be suppressed and attachment and detachment can be performed between the support pillars 4, thereby improving the work efficiency of assembling and dismantling the temporary scaffolding 1.

[0052] <Embodiment 2> This embodiment more specifically illustrates the joint horizontal member 2B as a tread member shown in Figures 6, 7, 9, and 11 of the first embodiment, and the temporary scaffolding 1 using the joint horizontal member 2B. The engagement portion 31 of the joint 3 of the joint horizontal member 2B of this embodiment is configured to be engaged with various horizontal members or the upper surface of the joint horizontal member 2A as a frame member of the first embodiment.

[0053] 13 and 14, the joint cross member 2B of this embodiment is a member also called an anti, and is composed of a tread member having a tread 20 provided on the upper surface of a rectangular frame member 200. The engagement portion 31 and slide lock portion 32 of this embodiment are formed on a tip member 220 provided at multiple locations in the width direction Y at the end portion in the longitudinal direction X of the frame member 200. The engagement portion 31 and slide lock portion 32 may be formed on a tip member 220 provided at one location in the width direction Y at the end portion in the longitudinal direction X of the frame member 200.

[0054] The engaging portion 31 in this embodiment is formed to extend from the end of the joint horizontal member 2B in the longitudinal direction X and the engaging direction Z so as to be engaged with the upper surface of the horizontal member or the joint horizontal member 2A. In other words, the engaging portion 31 is formed by bending downward or obliquely downward from a portion protruding from the end of the joint horizontal member 2A in the longitudinal direction X. As shown in FIG. 14, the slide lock portion 32 is slidably arranged at a position overlapping with the engaging portion 31 in the width direction Y of the joint horizontal member 2A. Also, the slide lock portion 32 may be slidably arranged at a position adjacent to the engaging portion 31 as shown in FIG. 15.

[0055] As shown in Fig. 13, a plurality of engaging portions 31 and slide lock portions 32 are provided at both ends of the joint horizontal member 2B in the longitudinal direction X. As shown in Fig. 5 and Fig. 6, the joint horizontal member 2B as a tread member is spanned by the engaging portions 31 provided at both ends to a pair of joint horizontal members 2A as frame members parallel to the depth direction D in a state parallel to the longitudinal direction L of the building 5.

[0056] As shown in Fig. 6 and Fig. 7, in the temporary scaffolding 1 of this embodiment, in order to form one-side scaffolding, joint horizontal members 2A as framework members are spanned across joint support parts 41 of columns 4 aligned in the length direction L of a building 5 in a state parallel to the length direction L, and joint horizontal members 2A as framework members are spanned across joint support parts 41 of columns 4 aligned in the depth direction D of the building 5 in a state parallel to the depth direction D. Then, joint horizontal members 2B as tread members are spanned across joint horizontal members 2A as framework members aligned in the length direction L. The joint horizontal members 2B as tread members may be used to form a frame scaffolding.

[0057] In this embodiment, by using the joint horizontal members 2A as the framework members and the joint horizontal members 2B as the tread members, the temporary scaffolding 1 can be easily formed. In this embodiment, too, the slide lock portion 32 of the joint horizontal members 2B as the tread members can provide the same effect as in the first embodiment.

[0058] Other configurations, actions, and effects of the joint beam 2B and the temporary scaffolding 1 of this embodiment are the same as those of the embodiment 1. Also, in this embodiment, the components denoted by the same reference numerals as those in the embodiment 1 are the same as those in the embodiment 1.

[0059] <Embodiment 3> This embodiment shows various structures of joint beams 2A. As shown in Fig. 16, the joint beam 2A as a frame member may have an additional engagement portion 261 supported by a joint support portion 41 located below the joint support portion 41 at the specific height of the support column 4, in addition to the engagement portion 31 supported by the joint support portion 41 at the specific height of the support column 4. A plurality of additional engagement portions 261 may be formed on the top and bottom.

[0060] The engaging portion 31 of the joint cross member 2A can be smoothly inserted from above parallel to the axial direction of the pillar 4 into the insertion hole 42 of the joint support portion 41 without hitting it with a hammer or the like. By utilizing this characteristic, the engaging portion 31 and the additional engaging portion 261 can be simultaneously inserted into the insertion holes 42 of multiple joint support portions 41.

[0061] 16 shows a case where a cantilever auxiliary member 26 inclined relative to the tubular member 21 is provided below the tubular member 21 of the joint cross member 2A as a frame member, and an additional engagement portion 261 is provided at the end of the cantilever auxiliary member 26. In this case, the rigidity of the joint cross member 2A can be increased. The cantilever auxiliary member 26 may be formed with a curved surface concave upwards to prevent the worker's head from colliding with it.

[0062] Although not shown, a double-supporting auxiliary member parallel to or inclined from the cylindrical member 21 may be provided below the cylindrical member 21 of the joint cross member 2A as a frame member, and the additional engagement parts 261 may be provided at both ends of the double-supporting auxiliary member. In this case as well, the rigidity of the joint cross member 2A can be increased.

[0063] Although not shown in the drawings, the joint cross member 2A as a frame member may be formed in a state inclined with respect to the horizontal direction, and the joints 3 at both ends may be formed to engage with joint support parts 41 at different heights (step positions) on a pair of supports 4. In this case, the joint cross member 2A can be used as a diagonal brace.

[0064] The joint horizontal member 2A as a frame member may form a handrail in addition to forming the tread portion. The handrail may be formed parallel to the joint horizontal member 2B as a tread member, or may be formed at an inclination angle corresponding to the inclination angle of a straight staircase or the like.

[0065] Although not shown in the figures, the joint 3 having the engagement portion 31 and the slide lock portion 32 may be provided at the upper end of an auxiliary column member extending in the height direction H, and the engagement portion 31 may be provided at the lower end of this auxiliary column member. In this case, the upper and lower engagement portions 31 of the auxiliary column member are engaged with the horizontal joint members 2A serving as frame members arranged above and below, and the slide lock portion 32 of the auxiliary column member is engaged with the lower end of the horizontal joint member 2A serving as the upper frame member. In this case, the auxiliary column member can be used to provide a handrail or the like.

[0066] The joint 3 having the engagement portion 31 and the slide lock portion 32 may be provided in the middle of the joint cross member 2A. In this case, the joint cross member 2A can be used as a connecting member such as an attachment through which another member is inserted or which is connected to another member.

[0067] As shown in Fig. 17, a joint horizontal member 2E as a framework member may be used in a temporary scaffolding 1 forming a straight staircase. In this case, the joint horizontal members 2E are arranged in pairs in a direction perpendicular to the depth direction D with respect to joint support parts 41 at different step positions of two supports 4 aligned in the length direction L, and are formed in a state inclined with respect to the length direction L at an inclination angle that forms a staircase. Stair tread parts 27 are provided at a plurality of intermediate positions of the joint horizontal members 2E.

[0068] In this case, the joints 3 at both ends of the joint cross member 2E are supported by the joint cross member 2A as a frame member supported by joint support parts 41 at different heights (step positions) of a pair of pillars 4 aligned in the length direction L. The length direction L and the depth direction D may be any direction as long as they are perpendicular to each other in the horizontal direction. The joints 3 at both ends of the joint cross member 2E may be supported by joint support parts 41 at different heights (step positions) of a pair of pillars 4 aligned in the length direction L.

[0069] In addition, the joint cross member 2A may be formed into various structures using the joint 3 having the engagement portion 31 and the slide lock portion 32.

[0070] Other configurations, actions, and effects of the joint beam 2A and the temporary scaffolding 1 of this embodiment are the same as those of the embodiment 1. Also in this embodiment, the components denoted by the same reference numerals as those in the embodiment 1 are the same as those in the embodiment 1.

[0071] <Embodiment 4> In this embodiment, as shown in Figures 18 to 22, a spiral staircase (spiral staircase) is formed by using joint horizontal members 2B as tread members formed in a right-angled triangle shape. The temporary scaffolding 1 of this embodiment includes a plurality of joint horizontal members 2A as tread members and a plurality of supports 4 provided with joint support parts 41.

[0072] 18 and 21, the multiple support columns 4 are installed at nine locations on the installation surface G: a central location P0, four corner locations on all four sides around the central location P0, and four intermediate locations between adjacent corner locations. Fig. 21 shows the temporary scaffolding 1 as a spiral staircase, excluding a step 2D (described later) formed at the top of the spiral staircase.

[0073] The pillars 4B at the multiple corner positions P1, P2, P3, and P4 are installed at equal intervals around the pillar 4A at the central position P0 at equal positions from the pillar 4A at the central position P0. The pillars 4C at the multiple intermediate positions P10, P20, P30, and P40 are installed at equal positions from the pillar 4A at the central position P0 at equal intervals around the pillar 4A at the central position P0 at intermediate positions of imaginary lines connecting the pillars 4B at the adjacent corner positions P1, P2, P3, and P4. In other words, the distances from the pillar 4A at the central position P0 to the pillars 4B at each corner position P1, P2, P3, and P4 are equal to each other, and the distances from the pillar 4A at the central position P0 to the pillars 4C at each intermediate position P10, P20, P30, and P40 are equal to each other. The joint support parts 41 of this embodiment are also provided in a plurality of positions aligned at predetermined intervals within a range of 200 to 260 mm in the axial direction of the plurality of supports 4A, 4B, 4C.

[0074] As shown in Fig. 22, the right-angled triangular joint cross member 2C is integrated with the tread 20, and has a pair of joints 3 and an auxiliary engagement portion 35 at the corners of the right-angled triangle. In other words, the right-angled triangular joint cross member 2C is formed by integrating the right-angled triangular tread 20 and the auxiliary engagement portion 35 with the joint cross member 2A as a frame member.

[0075] The auxiliary engagement portion 35 has a shape similar to that of the engagement portion 31 so as to be inserted from above into the insertion hole 42 of the joint support portion 41 of the pillar 4. The auxiliary engagement portion 35 functions as an engagement portion 31 to which the slide lock portion 32 is not provided adjacently. Since it is considered sufficient for the slide lock portion 32 to prevent the engagement portion 31 from coming off (lock) the joint support portion 41 at two points, the joint cross member 2C is formed with a pair of joints 3 and the auxiliary engagement portion 35.

[0076] The right-angled triangular joint horizontal members 2C forming the spiral staircase are composed of two types of symmetrical shapes with the side portion where the pair of joints 3 is provided as the axis of symmetry. The multiple joint horizontal members 2C are arranged in the temporary scaffolding 1 with different orientations in a plane perpendicular to the axial direction of the pillar 4A at the center position P0. The pair of joints 3 and the auxiliary engagement portion 35 of the right-angled triangular joint horizontal member 2C are supported by the joint support portion 41 of the pillar 4A at the center position P0, the joint support portion 41 of the pillar 4B at the corner positions P1, P2, P3, P4, and the joint support portion 41 of the pillar 4C at the intermediate positions P10, P20, P30, P40, which are adjacent to each other.

[0077] The auxiliary engagement portion 35 may be formed at any corner of the right-angled triangular joint horizontal member 2C, and the remaining two corners are formed with joints 3 having engagement portions 31 and slide lock portions 32. The right-angled triangular joint horizontal member 2C is formed in a right-angled triangle shape with a right angle formed between the side connecting the support 4C at the intermediate positions P10, P20, P30, P40 and the support 4A at the center position P0 and the side connecting the support 4C at the intermediate positions P10, P20, P30, P40 and the support 4B at the corner positions P1, P2, P3, P4. The engagement portions 31 and slide lock portions 32 in the pair of joints 3 are provided on any of the sides forming the right-angled corners of the right-angled triangular joint horizontal member 2C.

[0078] As shown in Figures 18 to 21, a plurality of right-angled triangular joint horizontal members 2C are supported by the joint support part 41 of the support 4A at the central position P0, the joint support part 41 of the support 4B at the adjacent corner positions P1, P2, P3, P4, and the joint support part 41 of the support 4C at the intermediate positions P10, P20, P30, P40, in the circumferential direction around the support 4A at the central position P0, while the support 4B at the angular positions P1, P2, P3, P4 and the support 4C at the intermediate positions P10, P20, P30, P40 are sequentially switched, forming a spiral staircase. In the spiral staircase, two types of right-angled triangular joint horizontal members 2C are used, in which the pair of joints 3 and the auxiliary engagement parts 35 are formed at symmetrical positions.

[0079] The spiral staircase using the right-angled triangular joint cross members 2C of this embodiment is formed in a state of going around the support column 4A at the center position P0 in a circumferential direction. Eight or more joint support parts 41 are provided at equal intervals in the axial direction on each of the support columns 4A, 4B, 4C at the center position P0, corner positions P1, P2, P3, P4, and intermediate positions P10, P20, P30, P40. Eight right-angled triangular joint cross members 2C are used in the spiral staircase. The right-angled triangular joint cross members 2C are supported by each joint support part 41 located at the upper step while being shifted in the circumferential direction from each joint support part 41 of the first step to each joint support part 41 of the eighth step.

[0080] As shown in Figures 18 and 21, the pillars 4B at corner positions P1, P2, P3, and P4 are sequentially arranged around the circumference as the pillars 4B at the first to fourth corner positions P1, P2, P3, and P4, and the pillars 4C at intermediate positions P10, P20, P30, and P40 are sequentially arranged around the circumference as the pillars 4C at the first to fourth intermediate positions P10, P20, P30, and P40.

[0081] The first-stage joint horizontal member 2C1 is supported by the first-stage joint support portions 41A of the pillar 4A at the center position P0, the pillar 4B at the first corner position P1, and the pillar 4C at the first intermediate position P10. The second-stage joint horizontal member 2C2 is supported by the second-stage joint support portions 41B of the pillar 4A at the center position P0, the pillar 4B at the first corner position P1, and the pillar 4C at the second intermediate position P20. The third-stage joint horizontal member 2C3 is supported by the third-stage joint support portions 41C of the pillar 4A at the center position P0, the pillar 4B at the second corner position P2, and the pillar 4C at the second intermediate position P20. The fourth-stage joint cross member 2C4 is supported by the fourth-stage joint support portions 41D of the pillar 4A at the center position P0, the pillar 4B at the second corner position P2, and the pillar 4C at the third intermediate position P30.

[0082] The fifth joint horizontal member 2C5 is supported by the fifth joint support portion 41E of the support 4A at the center position P0, the support 4B at the third corner position P3, and the support 4C at the third intermediate position P30. The sixth joint horizontal member 2C6 is supported by the sixth joint support portion 41F of the support 4A at the center position P0, the support 4B at the third corner position P3, and the support 4C at the fourth intermediate position P40. The seventh joint horizontal member 2C7 is supported by the seventh joint support portion 41G of the support 4A at the center position P0, the support 4B at the fourth corner position P4, and the support 4C at the third intermediate position P30. The eighth-stage joint cross member 2C8 is supported by the eighth-stage joint support portions 41H of the pillar 4A at the center position P0, the pillar 4B at the fourth corner position P4, and the pillar 4C at the first intermediate position P10.

[0083] In this way, the first to eighth joint cross members 2C are supported by the first to eighth joint support parts 41, forming a spiral staircase that ascends and descends around the support column 4A at the center position P0. Also, at each joint support part 41H of the eighth step, a step 2D is formed by the joint cross member 2A as a frame member shown in the first embodiment and the joint cross member 2B as a tread member shown in the second embodiment, connected to the eighth step joint cross member 2C8.

[0084] A tent may be provided above the spiral staircase, supported by the joint support part 41 of the pillar 4A at the central position P0, and at least one of the joint support parts 41 of the pillar 4B at the four corner parts P1, P2, P3, P4, and the joint support parts 41 of the pillar 4C at the four intermediate positions P10, P20, P30, P40. The tent may be formed by combining a joint cross member 2A as a frame member inclined in the horizontal direction with a sheet.

[0085] According to the temporary scaffolding 1 of this embodiment, it is possible to suppress the generation of noise and improve the work efficiency of assembling and dismantling a spiral staircase using the temporary scaffolding 1. Other configurations, actions, and effects of the temporary scaffolding 1 of this embodiment are similar to those of the first embodiment. Also, in this embodiment, components denoted by the same reference numerals as those in the first embodiment are similar to those in the first embodiment.

[0086] The right-angled triangular joint cross member 2C may be formed to have a joint 3 at one corner and auxiliary engagement portions 35 at the other two corners. The temporary scaffolding 1 forming a spiral staircase may be formed by using another joint cross member provided with a joint 3 with an engagement portion 31 (without a slide lock portion 32) instead of the joint cross member 2C provided with the joint 3 with the engagement portion 31 and the slide lock portion 32.

[0087] The temporary scaffolding 1 forming the spiral staircase of this embodiment is formed in a rectangular parallelepiped shape. Alternatively, the temporary scaffolding 1 forming the spiral staircase may be formed in a cylindrical shape. In this case, the peripheral supports 4 are arranged around the support 4A at the central position P0 at equal intervals at positions with equal radii from the support 4A at the central position P0. Each joint cross member 2C is formed in a shape that is supported by the joint support part 41 of the support 4A at the central position P0 and the joint support parts 41 of the supports 4 at two adjacent peripheral positions.

[0088] <Embodiment 5> 23 and 24, this embodiment shows a case where a plurality of joint support parts 41 arranged in the axial direction of the pillar 4 are each provided rotatably around the central axis of the pillar 4. Specifically, the joint support parts 41 in this embodiment are provided in a state where they are arranged in the axial direction of the pillars 4 at a predetermined dimensional interval within a range of 200 to 260 mm, and are configured by four support blocks 43 arranged overlapping each other in the axial direction of the pillars 4 and rotatable around the pillars 4.

[0089] As shown in Figures 23 and 26, the four support blocks 43 each have an insertion hole 42 into which the engagement portion 31 of the joint 3 is inserted from above. The four support blocks 43 can rotate 360°. By adjusting the rotation position of the support blocks 43, the orientation of the joint cross member 2A into which the engagement portion 31 is inserted into the support blocks 43 can be adjusted. This allows the horizontal arrangement angle of the joint cross member 2A into which the engagement portion 31 is inserted into the insertion hole 42 of the support block 43 to be arbitrarily changed.

[0090] As shown in FIG. 25, the joint support part 41 of the present embodiment, which is made up of four support blocks 43, is effective when the joint horizontal members 2A of the temporary scaffolding 1 are bent at an obtuse angle with respect to a building 5 whose exterior walls are curved in a plan view. As shown in FIG. 25, the building 5 may be bent so that an inner corner is formed, or may be bent so that an outer corner is rounded. FIG. 25 shows the building 5 and the temporary scaffolding 1 in a plan view. In this case, the joint horizontal members 2A1 and 2A2 as multiple frame members arranged approximately parallel to the exterior walls of the building 5 are inclined at an obtuse angle.

[0091] In the pair of joint supports 41 where the engaging parts 31 at both ends of one joint horizontal member 2A1 are supported, a joint horizontal member 2A3 is arranged as a frame member vertically and horizontally to one joint horizontal member 2A1. In the pair of joint supports 41 where the engaging parts 31 at both ends of the other joint horizontal member 2A2 are supported, a joint horizontal member 2A4 is arranged as a frame member vertically and horizontally to the other joint horizontal member 2A2.

[0092] In this way, in the joint support portion 41 located at the corner position between the joint horizontal members 2A1, 2A2 inclined at an obtuse angle, the four joint horizontal members 2A1, 2A2, 2A3, 2A4 are supported from different directions relative to the four support blocks 43. In other words, the four support blocks 43 are rotated in different directions corresponding to the four joint horizontal members 2A1, 2A2, 2A3, 2A4. In addition, the joint horizontal members 2B as tread members are spanned between the joint horizontal members 2A3 as the multiple frame members and between the joint horizontal members 2A4 as the multiple frame members.

[0093] Furthermore, a triangular auxiliary tread 28 is placed in the triangular gap formed between the joint horizontal members 2A3 and 2A4. There is a height difference between the adjacent joint horizontal members 2A1 and 2A2, and between the adjacent joint horizontal members 2A3 and 2A4, which corresponds to the height between the support blocks 43 arranged above and below. A step corresponding to this height difference is formed in the auxiliary tread 28.

[0094] In this manner, by using the support pillar 4 having the joint support portion 41 constituted by the four support blocks 43 of this embodiment, the temporary scaffolding 1 can be formed in an appropriate state, not too far from the building 5, for a building 5 whose exterior wall or the like is curved in a plan view. Also, for a building 5 having a cylindrical or spherical shape, for example, the temporary scaffolding 1 can be formed in an appropriate state, not too far from the building 5.

[0095] Other configurations, actions, and effects of the joint beam 2A and the temporary scaffolding 1 of this embodiment are the same as those of the embodiments 1 to 4. Also in this embodiment, components denoted by the same reference numerals as those in the embodiments 1 to 4 are the same as those in the embodiments 1 to 4.

[0096] <Embodiment 6> 27, this embodiment shows a case where a rear-attached column 46A is provided upward from a joint horizontal member 2A serving as a framework member supported horizontally by joint support parts 41 of a plurality of columns 4. The rear-attached column 46A is configured to be supported by the joint horizontal member 2A serving as a framework member supported by joint support parts 41 provided above and below the plurality of columns 4. An engagement part 31 and a slide lock part 32 are provided at the upper end of the rear-attached column 46A, and an auxiliary engagement part 35 is provided at the lower end of the rear-attached column 46A.

[0097] The engagement portion 31 and the auxiliary engagement portion 35 of the rear support 46A are formed in a shape that engages with the joint horizontal member 2A as a framework member from above. The rear support 46A is configured as a movable support, and can slide in the horizontal direction, which is the formation direction of the joint horizontal member 2A, while being supported by the joint horizontal member 2A as a framework member arranged vertically. After the sliding position of the rear support 46A relative to the joint horizontal member 2A is determined, the sliding position of the rear support 46A is fixed by the screws 36 provided in the engagement portion 31 and the auxiliary engagement portion 35. On the side of the rear support 46A opposite to the side where the engagement portion 31 and the auxiliary engagement portion 35 are provided, a plurality of joint support portions 41X are provided vertically lined up. Three or more joint support portions 41X may be provided at predetermined intervals in the axial direction of the rear support 46A.

[0098] As shown in FIG. 28, the rear-attached support 46A of this embodiment is effective when forming a part of the temporary scaffolding 1 in a concave space 51 formed between balconies arranged side by side when viewed from above. When forming a protruding scaffolding part 11 as a part of the temporary scaffolding 1 in the concave space 51, a plurality of rear-attached supports 46A at appropriate locations in the forming direction of the joint horizontal member 2A as a framework member. Then, the joint support parts 41X of the plurality of rear-attached supports 46A support the engagement parts 31 of the joint horizontal members 2A as framework members for forming the protruding scaffolding part 11. Then, the joint horizontal members 2B as step members are bridged across the plurality of joint horizontal members 2A, thereby forming the protruding scaffolding part 11 of the temporary scaffolding 1. In FIG. 28, the joint horizontal members 2B as step members bridged between the joint horizontal members 2A forming the main body part 10 of the temporary scaffolding 1 are omitted.

[0099] In this manner, by using the rear-attached support 46A of this embodiment, the protruding scaffolding portion 11 of the temporary scaffolding 1 can be formed in the concave space 51 when viewed from above. This allows the temporary scaffolding 1 to be formed in an appropriate state, not too far from the building 5, for a building 5 having an exterior wall or the like with a special shape.

[0100] The rear support 46A of this embodiment is arranged offset in the horizontal direction with respect to the joint horizontal members 2A as framework members arranged in parallel in the horizontal direction. In contrast, as shown in FIG. 29, the rear support 46B may be arranged as a stopper between the joint horizontal members 2A as framework members arranged vertically. In this case, the rear support 46B can be arranged in a vertically continuous state with the joint horizontal members 2A interposed therebetween. In this case, the rigidity of the protruding scaffolding section 11 can be increased. In this case, the joint support parts 41X provided near the upper and lower ends of the rear support 46B may be formed by dividing them into the rear support 46B arranged vertically.

[0101] The present invention is not limited to the respective embodiments, and further different embodiments can be configured without departing from the spirit of the present invention. The present invention also includes various modifications, modifications within the scope of the equivalents, and the like. [Explanation of symbols]

[0102] 1 Temporary scaffolding 2A, 2B Joint cross member 21 Cylindrical member 211 Top part 212 Side part 213 Bottom part 214 Downward protrusion 22 Tip member 23 Shaft 24 Recessed portion 25 Latch part 3. Joints 301 Lock position 302 Unlocked position 31 Engagement part 32 Slide lock part 321 Gripping part 322 Extension part 35 Auxiliary engagement part 4 pillars 41 Joint support 42 Insertion hole 421 Locking notch 43 Support Block 5. Building

Claims

1. A joint support portion of a support column constituting a temporary scaffolding, or a joint horizontal member provided with a joint supported by a horizontal member constituting the temporary scaffolding, The joint includes an engaging portion that is formed on the outside of the longitudinal end of the joint cross member, extends from the end and intersects with the longitudinal direction, and engages with the joint support portion or the cross member; a slide lock portion configured to slide by gravity at a position facing the engagement portion on the inside in the longitudinal direction, The slide lock portion is a locking position in which, under gravity, a base end of the slide locking portion is accommodated on an upper surface of the joint cross member and a tip end of the slide locking portion is engaged with a lower end of the joint support portion or a lower end of the cross member, thereby preventing the engagement portion from coming off the joint support portion or the cross member; The base end of the slide lock portion is engaged with the upper surface of the joint cross member, and the tip end of the slide lock portion is slidable to a lower end of the joint support portion or an unlocked position away from the lower end of the cross member, The joint has an accommodation recess on an upper surface of the joint cross member in which a base end of the slide lock portion in the locked position is accommodated, and a hook portion on an upper surface of the joint cross member in which a base end of the slide lock portion in the unlocked position is hooked, The joint has a shaft portion perpendicular to both the longitudinal direction and an engagement direction of the engagement portion, The accommodating recess is formed on the upper surface of the joint cross member in a state where it is open at both ends in a width direction perpendicular to the longitudinal direction, The slide lock portion has a plate-shaped grip portion at a base end of the slide lock portion, which is accommodated in the accommodation recess in a state where it is exposed above the accommodation recess and to a pair of sides, and which can be gripped by an operator, and an extension portion which extends from the grip portion in a state where it is inclined obliquely downward in the engagement direction so as to approach the engagement portion, and which is engaged with a lower end portion of the joint support portion or a lower end portion of the cross member, A joint cross member for temporary scaffolding, wherein the extension portion has a long hole for sliding that is formed in a state inclined diagonally downward in the engagement direction when the shaft portion is inserted therethrough.

2. The engagement portion of the joint is configured to be inserted from above into an insertion hole of the joint support portion of the support column, 2. The joint cross member for temporary scaffolding as described in claim 1, wherein the joint cross member is composed of a tubular member having an upper surface portion, a pair of side surfaces portion, and a lower surface portion, and a tip member joined to the longitudinal end portion of the tubular member, in which the engagement portion and the accommodating recess are formed and the slide lock portion is slidably arranged.

3. a downward protruding portion is formed continuously in the longitudinal direction at a central portion of the lower surface portion of the tubular member in a width direction perpendicular to the longitudinal direction, the downward protruding portion protruding downward compared to both side portions in the width direction, 3. The joint cross member for temporary scaffolding according to claim 2, wherein a part of a tip side of the extension portion of the slide lock portion in the locked position is disposed within the downward protrusion.

4. A joint support part of a support column constituting a temporary scaffolding, or a joint cross member provided with a joint supported by a cross member constituting the temporary scaffolding, The joint includes an engaging portion that is formed on the outside of the longitudinal end of the joint cross member, extends from the end and intersects with the longitudinal direction, and engages with the joint support portion or the cross member; a slide lock portion configured to slide by gravity at a position facing the engagement portion on the inside in the longitudinal direction, The slide lock portion is a locking position in which, under gravity, a base end of the slide locking portion is accommodated on an upper surface of the joint cross member and a tip end of the slide locking portion is engaged with a lower end of the joint support portion or a lower end of the cross member, thereby preventing the engagement portion from coming off the joint support portion or the cross member; The base end of the slide lock portion is engaged with the upper surface of the joint cross member, and the tip end of the slide lock portion is slidable to a lower end of the joint support portion or an unlocked position away from the lower end of the cross member, The joint has an accommodation recess on an upper surface of the joint cross member in which a base end of the slide lock portion in the locked position is accommodated, and a hook portion on an upper surface of the joint cross member in which a base end of the slide lock portion in the unlocked position is hooked, The engaging portion of the joint is configured to be engaged with an upper surface of the cross member, The joint cross member is constituted by a step member having a step provided on an upper surface of a rectangular frame member, A joint cross member for temporary scaffolding, wherein the engagement portion is provided in one or more at the longitudinal end of the tread member.

5. The joint has an axial portion perpendicular to both the longitudinal direction and the engagement direction of the engagement portion, The accommodating recess is formed on the upper surface of the joint cross member in a state where it is open at both ends in a width direction perpendicular to the longitudinal direction, The slide lock portion has a plate-shaped grip portion at a base end of the slide lock portion, which is accommodated in the accommodation recess in a state where it is exposed above the accommodation recess and to a pair of sides, and which can be gripped by an operator, and an extension portion which extends from the grip portion in a state where it is inclined obliquely downward in the engagement direction so as to approach the engagement portion, and which is engaged with a lower end portion of the joint support portion or a lower end portion of the cross member, The joint cross member for temporary scaffolding as described in claim 4, wherein the extension portion has a long hole for sliding that is formed in a state in which the shaft portion is inserted and is inclined diagonally downward in the engagement direction.

6. A temporary scaffolding comprising a joint horizontal member for a temporary scaffolding according to any one of claims 1 to 3, a plurality of columns provided with the joint support portion, and a step plate fixed or placed on an upper surface of the joint horizontal member, The joint is provided at one end or both ends in the longitudinal direction of the joint cross member, The joint cross member is supported in a cantilevered state by the joint support portions of the multiple pillars by the joint at one end, or is supported in a double-supported state by the joints at both ends by the joint support portions of the multiple pillars, forming a temporary scaffolding.

7. A temporary scaffolding comprising a plurality of joint horizontal members for temporary scaffolding according to any one of claims 1 to 3 and columns provided with the joint support portions, The plurality of support columns are installed at nine locations, including a central location on the installation surface, four corner locations located on all four sides around the central location, and four intermediate locations between adjacent corner locations, The joint support portion is provided in a state where it is arranged at a predetermined dimensional interval within a range of 200 to 260 mm in the axial direction of the plurality of the pillars, The joint cross member is integrated with the tread plate and is supported by the joint support portion of the central support column and the joint support portion of the corner support column and the joint support portion of the intermediate support column, which are adjacent to each other. The joint cross member is formed in a right-angled triangular shape having a pair of the joints and auxiliary engagement portions at the corners, The multiple joint cross members form a spiral staircase by a pair of the joints and auxiliary engagement portions being supported by the joint support portion of the central position support column and the joint support portions of the adjacent corner position support columns and the joint support portions of the intermediate position support columns, which are positioned in upper tiers, with the corner position support columns and the intermediate position support columns being supported in a circumferential direction around the central position support column, alternating between the corner position support columns and the intermediate position support columns.

8. the angular support columns are equidistant from and equidistantly spaced about the central support column; the intermediate posts are disposed at equal distances from and equally spaced about the central post at intermediate positions between adjacent corner posts, 8. The temporary scaffolding according to claim 7, wherein the multiple right-angled triangular joint cross members forming the spiral staircase are composed of two types of symmetrical shapes with the side portion on which a pair of the joints are provided as the axis of symmetry, and are arranged with different orientations in a plane perpendicular to the axial direction of the central support.

9. The joint support portion is provided in a state where a plurality of the joint support portions are arranged at predetermined intervals within a range of 200 to 260 mm in the axial direction of the plurality of the support columns, and is configured by four support blocks that are arranged overlapping each other in the axial direction of the support columns and are rotatable around the support columns, The four support blocks each have an insertion hole into which the engagement portion of the joint is inserted from above, 7. The temporary scaffolding according to claim 6, wherein an orientation of the joint cross member into which the engaging portion is inserted into the support block can be adjusted by adjusting a rotational position of the support block.

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