Connection member for temporary scaffold post

Abstract

To provide a connection member for temporary scaffold posts that can make a buckling strength at a time when detachably attaching a connection member for temporary scaffold posts to one end of one of the posts equal to or greater than buckling strength when fixing a connection member for temporary scaffold posts by welding.SOLUTION: A connection member 30 for a temporary scaffold post comprises: a cylindrical connection member body 33 having an insertion portion 31 detachably attached to one end 11a of one of posts 11 and inserted from one end 11a of one of the posts 11 into an interior of one of the posts 11, and a protrusion portion 32 protruding from one end 11a of one of the posts 11, and a locking mechanism 40 detachably locking the connection member body 33 to one of the posts 11. An insertion length L1 of the insertion portion 31 into one of the posts 11 is an insertion length that makes buckling strength of the connection member 30 for temporary scaffold post equal to or greater than buckling strength when fixing the connection member for a temporary scaffold post to one end 11a of one of the posts 11 by welding.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a connecting member for temporary scaffolding supports used in temporary scaffolding at construction sites. [Background technology]

[0002] Conventionally, at construction sites, temporary scaffolding is erected and the building is constructed inside this temporary scaffolding.

[0003] This temporary scaffolding is comprised of multiple vertically extending columns, horizontal members attached to fastening parts arranged at predetermined intervals in the vertical direction on each column, and a floor-attached fabric frame installed between the horizontal members. This type of temporary scaffolding is used by connecting it horizontally or vertically depending on the conditions of the construction site. When connecting temporary scaffolding in the vertical direction, the lower end of the upper support is connected to the upper end of the lower support using a temporary scaffolding support connecting member (hereinafter referred to as a "tenon").

[0004] Here, as shown in Figure 13, tenon 101 generally has a cylindrical shape and is inserted into the upper end 102a of the lower support 102 and fixed by a weld 103 (hereinafter, a tenon welded in this manner will be referred to as a "welded tenon").

[0005] However, in applications such as those shown in Figure 14 below, it is necessary to remove the tenon from the support. Figure 14 illustrates the problem that occurs when a floor-attached fabric frame 114 installed on a cross member 113 erected on a fastening portion arranged at the upper end 112a of the uppermost support 112 is assembled flatly as a stage work floor, and the welded tenon 111 protrudes upward from the floor-attached fabric frame 114.

[0006] As shown in Figure 14(a), when assembling a floor-attached cloth frame 114 installed on a cross member 113 erected on a fastening portion arranged at the upper end 112a of the uppermost support pillar 112 in a planar manner as a stage work floor, if the welded tenon 111 protrudes upward from the floor-attached cloth frame 114 as shown in Figure 14(b), it may cause a worker to trip over the welded tenon 111 and fall.

[0007] For this reason, a tenon (hereinafter referred to as a "detachable tenon") that can be detachably attached to the upper end 112a of the support 112 of the temporary scaffolding located below has been commercialized. The insertion length of this commercialized detachable tenon into the support 112 is 90 mm. Conventionally, detachable tenons have been proposed, for example, as shown in Patent Documents 1 to 3.

[0008] The stud joint for frame scaffolding shown in Patent Document 1 has an upper insertion section and a lower insertion section connected above and below a long pressure-receiving section, and a pin through hole is opened in the lower insertion section. When connecting frame scaffoldings vertically, the lower insertion section of the stud joint is inserted into the upper end of the stud of the frame scaffolding located below, and the lower end of the stud of the frame scaffolding to be located above is inserted into the upper insertion section from above to connect them. Then, the pin through hole opened in the lower insertion section is connected to the pin through hole opened in the upper end of the stud of the frame scaffolding located below with a pin.

[0009] Furthermore, the stud joint for frame scaffolding shown in Patent Document 2 has an upper insertion section and a lower insertion section connected above and below a long pressure-receiving section, with a pin through-hole opened in the lower insertion section and a horizontal connecting rod protruding from the upper part of the pressure-receiving section to engage with and disengage from the receiving hole of the handrail rod. When connecting frame scaffoldings vertically, the lower insertion section of the stud joint is inserted into the upper end of the stud of the frame scaffolding located below, and the lower end of the stud of the frame scaffolding to be located above is inserted into the upper insertion section from above to connect them. Then, a pin is used to connect the pin through-hole opened in the lower insertion section to the pin through-hole opened in the upper end of the stud of the frame scaffolding located below.

[0010] Furthermore, the extension pipe for temporary scaffolding shown in Patent Document 3 is an extension pipe for adjusting the height of the building frame of temporary scaffolding, and is equipped with a first extension part having an inner peripheral shape near its lower end that fits onto the upper end of a connecting pin attached to the lower building frame and having the adjusted height, and a second extension part that is connected upward from the first extension part and has a shape that can be fitted into the lower end of the connecting upper building frame. The lower connecting pin and the first extension part are prevented from coming off by a lock arm, and the first extension part and the second extension part are prevented from coming off by separate lock arms. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Utility Model Application Publication No. 2-130943 [Patent Document 2] Japanese Utility Model Application Publication No. 3-5842 [Patent Document 3] Japanese Patent Application Publication No. 2019-157445 Summary of the Invention [Problem to be solved by the invention]

[0012] The detachable tenons that have been commercialized as described above have lower buckling strength than welded tenons. For this reason, at work sites where temporary scaffolding is connected above and below, there is a demand for detachable tenons with the same buckling strength as welded tenons, making them more versatile.

[0013] On the other hand, in all of the cases of the cited documents 1 to 3, there is no consideration whatsoever about making the buckling strength of the detachable tenon equal to the buckling strength of the welded tenon.

[0014] Therefore, the present invention has been made to solve this conventional problem, and its object is to provide a connecting member for temporary scaffolding supports which, when attached detachably to one end of one of the supports, can ensure that the buckling strength of the connecting member for temporary scaffolding supports at the support connection portion is equal to or greater than the buckling strength when the connecting member for temporary scaffolding supports is fixed to one end of one of the supports by welding. [Means for solving the problem]

[0015] In order to solve the above-mentioned problems, one aspect of the present invention provides a temporary scaffolding connecting member for connecting one end of a cylindrical support on one side of temporary scaffolding located on the other side to one end of a cylindrical support on one side of temporary scaffolding located on the other side, the temporary scaffolding connecting member being detachably attached to one end of the one-side support, the temporary scaffolding connecting member comprising: a cylindrical connecting member body having an insertion portion that is inserted from one end of the one-side support into the interior of the one-side support and a protrusion that protrudes from one end of the one-side support; and a locking mechanism that detachably locks the connecting member body to the one-side support, the insertion length of the insertion portion into the one-side support being an insertion length that makes the buckling strength of the temporary scaffolding connecting member equal to or greater than the buckling strength when the temporary scaffolding connecting member is fixed to the one end of the one-side support by welding. [Effects of the Invention]

[0016] According to the temporary scaffolding support connecting member (detachable tenon) of the present invention, when the temporary scaffolding support connecting member is detachably attached to one end of one of the supports, the insertion length is set to make the buckling strength of the temporary scaffolding support connecting member (detachable tenon) equal to or greater than the buckling strength when the temporary scaffolding support connecting member is fixed to one end of one of the supports by welding (welded tenon).This makes it possible to make the buckling strength of the temporary scaffolding support connecting member (detachable tenon) at the support connection portion equal to or greater than the buckling strength when the temporary scaffolding support connecting member is fixed to one end of one of the supports by welding (welded tenon). [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B are diagrams illustrating a portion of a scaffold to explain the connection of posts using detachable tenons as connecting members for temporary scaffold posts in one embodiment of the present invention, and the configuration of each member, where (a) is a front view and (b) is a right side view. [Figure 2] FIG. 2 is a front view of the state in which a detachable tenon is attached to the upper end of the lower support shown in FIG. 1. [Figure 3] A cross-sectional view illustrating how an upper support is connected to the upper end of a lower support via a detachable tenon. [Figure 4] 4A and 4B show a detachable tenon, in which (a) is a plan view and (b) is a cross-sectional view taken along line 4b-4b in (a). [Figure 5] A cross-sectional view illustrating how a removable tenon is attached to the upper end of the lower support. [Figure 6] This is a diagram to explain the inclination of the connecting member body of the current detachable tenon when the insertion length of the insertion portion of the connecting member body is set to 90 mm when determining the upper and lower limits of the insertion length of the insertion portion of the connecting member body. [Figure 7] This is a diagram for explaining the inclination of the connecting member body of a prototype when the insertion length of the insertion part of the connecting member body is set to 200 mm when determining the upper and lower limits of the insertion length of the insertion part of the connecting member body. [Figure 8] This is a diagram for explaining the inclination of the connecting member body of a prototype when the insertion length of the insertion part of the connecting member body is set to 300 mm when determining the upper and lower limits of the insertion length of the insertion part of the connecting member body. [Figure 9] This explains the test scaffolding for measuring the buckling load of the current detachable tenon with an insertion length of 90 mm for the insertion part of the connecting member body, a prototype with an insertion length of 200 mm, a prototype with an insertion length of 300 mm, and a welded tenon with an insertion length of 90 mm, where (a) is a front view of the test scaffolding and (b) is a right side view of the test scaffolding. [Figure 10]10(b) is a front view of (a), which explains a modified locking mechanism, and (b) is a plan view of a detachable tenon with a modified locking mechanism attached to the upper end of the lower support. However, in Fig. 10(b), the lower support and the connecting member body of the detachable tenon are shown in cross section. [Figure 11] FIG. 11 is a left side view of the locking mechanism in FIG. [Figure 12] FIG. [Figure 13] FIG. 1 is a diagram illustrating a general example of a welded tenon. [Figure 14] This explains the problems that arise when a floor-attached cloth frame installed on the highest support is assembled flatly as a stage work floor, and a welded tenon protrudes upward relative to the floor-attached cloth frame. (a) is an explanatory diagram of the case where a floor-attached cloth frame installed on the highest support is assembled flatly as a stage work floor, and (b) is an explanatory diagram pointing out the problems that arise when a welded tenon protrudes upward relative to the floor-attached cloth frame. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the materials, shapes, structures, arrangements, etc. of the components.

[0019] In addition, the drawings are schematic, and therefore it should be noted that the relationship between thickness and planar dimensions, ratios, etc. may differ from the actual relationship, and the drawings may also contain parts where the relationship and ratio of dimensions differ from each other.

[0020] FIG. 1 shows an extracted portion of scaffolding to illustrate the connection of posts using detachable tenons and the configuration of each component according to one embodiment of the present invention. As illustrated in Figures 1(a) and (b), a lower temporary scaffolding 1 located on the lower side as one side and an upper temporary scaffolding 2 located on the upper side as the other side are connected from bottom to top.

[0021] Here, the lower temporary scaffolding 1 includes a plurality (four in this example) of lower supports (supports on one side) 11 each having an upper end (one end) 11a and a lower end (the other end) 11b extending in the vertical direction. Each lower support 11 is formed of a cylindrical pipe member and is provided with a plurality (four in this example) of fastening parts 12 arranged at predetermined intervals in the vertical direction. Of the four fastening parts 12 arranged on the two front and rear lower supports 11 on the left side, one cross member 13 is erected so as to extend in the front-to-back direction relative to the second-lowest fastening part 12. In addition, of the four fastening parts 12 arranged on the two front and rear lower supports 11 on the right side, one cross member 13 is erected so as to extend in the front-to-back direction relative to the second-lowest fastening part 12. A floor-mounted fabric frame 14 is installed between the two cross members 13. Furthermore, a leading handrail brace 15 is installed between the topmost of the four fastening parts 12 arranged on the two left and right lower supports 11 on the front side. A leading handrail brace 15 is also installed between the topmost of the four fastening parts 12 arranged on the two left and right lower supports 11 on the rear side. Locking fittings 16 are installed near the lower ends 11b of each lower support 11.

[0022] The upper temporary scaffolding 2 also includes a plurality (four in this example) of upper supports (supports on the other side) 21 each having an upper end (other end) 21a and a lower end (one end) 21b extending in the vertical direction. Each upper support 21 is a cylindrical pipe member and is provided with a plurality (four in this example) of fastening portions 22 arranged at predetermined intervals in the vertical direction. Of the four fastening portions 22 arranged on the two front and rear upper supports 21 on the left side, one cross member 23 is erected so as to extend in the front-to-back direction relative to the second-lowest fastening portion 22. Of the four fastening portions 22 arranged on the two front and rear upper supports 21 on the right side, one cross member 23 is erected so as to extend in the front-to-back direction relative to the second-lowest fastening portion 22. A floor-mounted fabric frame 24 is installed between the two cross members 23. Furthermore, a leading handrail-equipped brace 25 is installed between the uppermost of the four fastening portions 22 arranged on the two left and right upper supports 21 on the front side. A leading handrail-equipped brace 25 is also installed between the uppermost of the four fastening portions 22 arranged on the two left and right upper supports 21 on the rear side. A locking metal fitting 26 is installed near the lower end 21b of each upper support 21.

[0023] When connecting the upper temporary scaffolding 2 to the upper side of the lower temporary scaffolding 1, the lower ends (one ends) 21b of the four cylindrical upper supports 21 are connected to the upper ends (one ends) 11a of the four cylindrical lower supports 11 using four detachable tenons (connecting members for temporary scaffolding supports) 30 (see Figures 2 to 5).

[0024] As shown in Figure 2, each detachable tenon 30 is detachably attached to the upper end (one end) 11a of the lower support 11. And, as shown in Figure 3, the lower end (one end) 21b of the upper support 21 is attached to the detachable tenon 30.

[0025] As shown in Figures 3 to 5, each detachable tenon 30 includes a cylindrical connecting member body 33 having an insertion portion 31 inserted into the lower support 11 from the upper end (one end) 11a of the lower support 11 and a protrusion portion 32 protruding upward from the upper end (one end) 11a of the lower support 11. The connecting member body 33 is a cylindrical steel member. As shown in Figure 4(b), the insertion portion 31 has two pin holes 37 formed at positions 180° apart along the circumferential direction. Furthermore, as shown in Figure 4(b), the protrusion portion 32 has four locking holes 38 formed at positions 90° apart along the circumferential direction.

[0026] The insertion length of the insertion portion 31 into the lower support 11 is set to L1, but the extent to which this insertion length L1 should be set will be described later.

[0027] In addition, as shown in Figures 3 to 5, the detachable tenon 30 is equipped with a locking mechanism 40 that detachably locks the connecting member main body 33, whose insertion portion 31 is inserted into the lower support 11, to the lower support 11.

[0028] As shown in Figures 4(a) and (b), the locking mechanism 40 is arranged inside the insertion portion 31 and is composed of a locking pin 34 having a pair of pin portions 36 provided at both ends of a spring portion 35 so as to protrude from the outer circumferential surface of the insertion portion 31. As shown in Figure 4(b), each of the pair of pin portions 36 protrudes from the outer circumferential surface of the insertion portion 31 through each of two pin holes 37 formed in the insertion portion 31 due to the elastic force of the spring portion 35. In this way, the locking pin 34 inserted into the insertion portion 31 is attached to the insertion portion 31.

[0029] The spring portion 35 of the lock pin 34 is curved so that its cross section is U-shaped. In the example shown in Fig. 4(b), the spring portion 35 is inserted into the insertion portion 31 with the convex side of the U facing downward, but it may also be inserted into the insertion portion 31 with the convex side of the U facing upward. Whether the spring portion 35 is inserted with the convex side of the U facing downward or upward can be determined appropriately depending on the insertion length L1 of the insertion portion 31.

[0030] Then, as shown in FIG. 5, the detachable tenon 30 with the lock pin 34 attached to the insertion portion 31 is rotated 45° from the state shown in FIG. 4 with the insertion portion 31 facing downward, and in this state, the detachable tenon 30 is inserted into the lower support 11 from the upper end 11a. As a result, the pin portion 36 protruding from the outer peripheral surface of the insertion portion 31 enters the pin engagement hole 11c formed near the upper end 11a of the lower support 11, locking the connecting member body 33 to the lower support 11. With the connecting member body 33 locked to the lower support 11, the insertion length of the insertion portion 31 becomes L1, as shown in FIG. 2. To remove the detachable tenon 30 from the lower support 11, simply press the pin portion 36 inward to release it from the locked state of the pin portion 36 in the pin engagement hole 11c, and then pull the detachable tenon 30 upward.

[0031] When connecting the upper support 21 of the upper temporary scaffolding 2 to the lower support 11 of the lower temporary scaffolding 1, the lower end 21b of the upper support 21 is attached to the detachable tenon 30 by lowering the lower end 21b of the upper support 21 and inserting the protruding portion 32 of the connecting member body 33 of the detachable tenon 30 into the upper support 21, as shown in Figure 3. This causes the locking fitting 26 (see Figure 1) provided on the upper support 21 to enter one of the four locking holes 38 formed in the protruding portion 32 of the detachable tenon 30, locking the upper support 21 to the detachable tenon 30. This attaches the lower end 21b of the upper support 21 to the detachable tenon 30, and the lower end 21b of the upper support 21 to the upper end 11a of the lower support 11.

[0032] Next, the insertion length L1 of the insertion portion 31 relative to the lower support 11 will be described. When the detachable tenon 30 is detachably attached to the upper end 11a of the lower support 11, it is important that the insertion length L1 of the insertion portion 31 into the lower support 11 be an insertion length that makes the buckling strength of the detachable tenon 30 at the support connection portion equal to or greater than the buckling strength of a welded tenon.

[0033] From this perspective, when determining the upper and lower limits of the insertion length L1 of the insertion portion 31 of the connecting member main body 33, the inclination and buckling strength of each type of tenon was investigated for the current detachable tenon with an insertion length L1 of 90 mm, a prototype with an insertion length L1 of 200 mm, a prototype with an insertion length L1 of 300 mm, and a welded tenon with an insertion length L1 of 90 mm.

[0034] Figure 6 shows an explanation of the inclination θ of the connecting member body 33 of the current detachable tenon when determining the upper and lower limits of the insertion length L1 of the insertion portion 31 of the connecting member body 33, with the insertion length of the insertion portion 31 of the connecting member body 33 set to 90 mm. FIG. 7 similarly illustrates the inclination θ of the connecting member body 33 of the prototype when the insertion length L1 is set to 200 mm.

[0035] Similarly, FIG. 8 illustrates the inclination θ of the connecting member body 33 of the prototype when the insertion length L1 is set to 300 mm. 6 to 8, the outer diameter D of the lower support 11 is 48.6 mm, the plate thickness t of the lower support 11 is 2 mm, the outer diameter d of the connecting member main body 33 is 42.7 mm, the length of the lower support 11 is 1800 mm, the plate thickness of the connecting member main body 33 is 2.4 mm, and the protruding length L2 of the protruding portion 32 on the connecting member main body 33 is 110 mm, all of which are common.

[0036] Although not shown, in the case of a welded tenon, the outer diameter D of the lower support 11 is 48.6 mm, the plate thickness t of the lower support 11 is 2 mm, the length of the lower support 11 is 1800 mm, the outer diameter d of the welded tenon is 42.7 mm, and the protruding length of the protruding part in the welded tenon is 110 mm. Also, in the case of a welded tenon, the insertion length of the insertion part into the lower support is 90 mm, as mentioned above, the same as the current detachable tenon shown in Figure 6.

[0037] Here, in the case of any of the tenons shown in Figures 6 to 8, there is a clearance of 48.6 mm (outer diameter D of lower support 11) - 2 mm (plate thickness t of lower support 11) x 2 faces - 42.7 mm (outer diameter d of connecting member main body 33) = 1.9 mm between the outer surface of the connecting member main body 33 and the inner surface of the lower support 11.

[0038] Due to this clearance, in the case of the current detachable tenon in which the insertion length of the insertion portion 31 of the connection member body 33 is 90 mm, the connection member body 33 is tilted at θ = 1.20° relative to the lower support 11, as shown in Figure 6. Similarly, in the case of a prototype in which the insertion length of the insertion portion 31 of the connection member body 33 is 200 mm, the connection member body 33 is tilted at θ = 0.53° relative to the lower support 11, as shown in Figure 7. Furthermore, in the case of a prototype in which the insertion length of the insertion portion 31 of the connection member body 33 is 300 mm, the connection member body 33 is tilted at θ = 0.35° relative to the lower support 11, as shown in Figure 8.

[0039] On the other hand, in the case of a welded tenon, the welded tenon and the lower support are fixed by welding, so the inclination of the welded tenon relative to the lower support is zero. In this way, the longer the insertion length L1 of the insertion portion 31 of the connection member main body 33, the smaller the inclination θ of the connection member main body 33 with respect to the lower support 11 becomes.

[0040] Figure 9 also shows a test scaffold for measuring the buckling load of the current detachable tenon with an insertion length L1 of 90 mm for the insertion portion 31 of the connecting member main body 33, a prototype with the insertion length L1 of 200 mm, a prototype with the insertion length L1 of 300 mm, and a welded tenon with the insertion length L1 of 90 mm.

[0041] This test scaffolding has a lower temporary scaffolding 1 located on the lower side and an upper temporary scaffolding 2 located on the upper side, which are connected vertically, similar to Fig. 1. This test scaffolding has the same basic configuration as the scaffolding shown in Fig. 1, and detailed description thereof will be omitted. In the test scaffolding shown in FIG. 9, the lower ends 11b of the four lower supports 11 of the lower temporary scaffolding 1 are fixed onto the jack bases 50, respectively.

[0042] In addition, a jack base 61 is fixed to the upper end (other end) 21a of each of the two front and rear upper pillars 21 on the right side of the upper temporary scaffolding 2, and an H-shaped steel pressure jig 62 that spans the two front and rear upper pillars 21 is placed on these jack bases 61.

[0043] Regarding the two front and rear pillars of the right-hand pressure section of the lower temporary scaffolding 1 that are the subject of the test, first, for each of the two front and rear pillars on the right side, the lower lower pillar 11 is a tenon-welded pillar with a welded tenon welded in place, and the upper pillar 21 connected above it is a tenon-detachable pillar without a tenon. Then, load-receiving jack bases 61 are set on the two front and rear upper pillars 21, and the test is carried out.

[0044] Next, for each of the two front and rear support columns on the right side, the lower lower support column 11 is made into a tenon-detachable support column with a current detachable tenon with an insertion length of 90 mm, and the upper support column 21 connected above it is made into a tenon-detachable support column without a tenon.Then, the load-receiving jack base 61 is set on the two front and rear upper supports 21 and the test is carried out.

[0045] Finally, for each of the two front and rear support columns on the right side, the lower support column 11 on the lower side is a detachable tenon support column with a prototype inserted length of 200 mm / 300 mm, and the upper support column 21 connected above is a detachable tenon support column without a tenon.The load-receiving jack base 61 is then set on the two front and rear upper support columns 21 and the test is carried out.

[0046] Then, when measuring the buckling load of each test specimen, as shown in Figs. 9(a) and 9(b), pressure was applied from above to the center of an H-beam pressing jig 62, and the buckling load was measured. The buckling load (kN) for each test specimen was as follows:

[0047] Welded fixture: 94.2kN Current detachable tenon (90mm): 78.7kN Prototype (200mm): 88.6kN Prototype (300mm): 108.4kN

[0048] Next, from these results, a lower limit value of the insertion length L1 of the insertion portion 31 into the lower support 11 is determined, which is equal to or greater than the buckling load (94.2 kN) of the welded fixed part.

[0049] The buckling load of the 200 mm prototype was smaller than the buckling load of the welded fixture, and the buckling load of the 300 mm prototype exceeded the buckling load of the welded fixture. From the buckling loads of the 200 mm and 300 mm prototypes, the lower limit of the insertion length L1 equivalent to the buckling load of the welded fixture was determined to be 235 mm. This lower limit of the insertion length L1 was determined when the outer diameter D of the lower support 11 was 48.6 mm, the plate thickness t of the lower support 11 was 2 mm, the length of the lower support 11 was 1800 mm, the outer diameter d of the connecting member main body 33 was 42.7 mm, and the plate thickness of the connecting member main body 33 was 2.4 mm.

[0050] The reason why the buckling strength of the detachable tenon 30 at the support post portion can be made equal to or greater than the buckling strength of a welded tenon is that the length (insertion length L1) of the double tube portion where the detachable tenon 30 and the lower support post 11 are joined is longer than that of the current detachable tenon (insertion length 90 mm).

[0051] On the other hand, the upper limit of the insertion length L1 of the insertion part 31 into the lower support 11 is set to 400 mm. Because the detachable tenon 30 and the lower support 11 are double-tube, the longer the insertion length L1, the higher the buckling strength can be, but taking into account the balance between cost and mass, the upper limit of the insertion length L1 is set to 400 mm.

[0052] The lower and upper limits of this insertion length L1 are when the outer diameter D of the lower support 11 is 48.6 mm, the plate thickness t of the lower support 11 is 2 mm, the length of the lower support 11 is 1800 mm, the outer diameter d of the connecting member main body 33 is 42.7 mm, and the plate thickness of the connecting member main body 33 is 2.4 mm.

[0053] As explained above, the detachable tenon 30 according to this embodiment comprises a cylindrical connecting member body 33 having an insertion portion 31 that is inserted into the lower support 11 from the upper end 11a of the lower support 11 and a protrusion 32 that protrudes from the upper end 11a of the lower support 11, and a locking mechanism 40 that detachably locks the connecting member body 33 to the lower support 11. The insertion length L1 of the insertion portion 31 into the lower support 11 is an insertion length that makes the buckling strength of the detachable tenon 30 equal to or greater than the buckling strength of a welded tenon.

[0054] This allows the buckling strength of the detachable tenon 30 at the post connection portion to be equal to or greater than the buckling strength of a welded tenon. Furthermore, by making the buckling strength of the detachable tenon 30 at the post connection part equivalent to that of a welded tenon, the "detachable tenon post," which was previously limited to use only in the top row, can now also be used in the middle row, ensuring versatility.

[0055] Furthermore, according to the detachable tenon 30 of this embodiment, when the outer diameter D of the lower support 11, the plate thickness t of the lower support 11, the length of the lower support 11, the outer diameter d of the connecting member main body 33, and the plate thickness of the connecting member main body 33 are as described above, the insertion length L1 of the insertion portion 31 into the lower support 11 is 235 mm or more and 400 mm or less, which is longer than the insertion length (90 mm) of current detachable tenons, and the buckling strength of the detachable tenon 30 at the support connection portion is equal to or greater than that of a welded tenon.

[0056] Furthermore, according to the detachable tenon 30 of this embodiment, the locking mechanism 40 is composed of a lock pin 34 that is arranged within the insertion portion 31 and has pin portions 36 that protrude from the outer surface of the insertion portion 31 and are provided at both ends of the spring portion 35, and the pin portions 36 are detachably locked to the lower support 11. As a result, the lock mechanism 40 can be configured simply by the lock pin 34, which allows the connecting member body 33 to be detachably locked to the lower support 11.

[0057] Although the embodiments of the present invention have been described above, the present invention is not limited to the above and various modifications and improvements can be made. The insertion length L1 of the insertion portion 31 into the lower support 11 is not limited to 235 mm or more and 400 mm or less, as long as the insertion length makes the buckling strength of the detachable tenon 30 equal to or greater than the buckling strength of a welded tenon.

[0058] Furthermore, the locking mechanism 40 is not limited to being composed of a locking pin 34, but may also be composed of a fixing pin 41 that is inserted into the lower support 11 and the insertion portion 31, and a pincushion pin 44 that prevents the fixing pin 41 from coming loose, as shown in Figures 10 to 12.

[0059] In this case, the fixing pin 41 comprises a fixing shaft portion 42 that is inserted through the pin engagement 11c of the lower support 11 and the pin hole 37 of the insertion portion 31 and crosses the lower support 11 and the insertion portion 31, and a head portion 43 that is provided at one end of the fixing shaft portion 42 and prevents one side of the fixing shaft portion 42 from coming off. The pine needle pin 44 comprises a shaft portion 45 that is inserted through a pine needle pin hole 42a formed at the other end of the fixing shaft portion 42 of the fixing pin 41, and an elastic clamping portion 46 that extends from the upper end of the shaft portion 45 and elastically clamps the fixing shaft portion 42, thereby preventing the other side of the fixing shaft portion 42 from coming off. [Explanation of symbols]

[0060] 1 Temporary scaffolding on the lower side (one side) 2 Upper (other) side of temporary scaffolding 11 Lower support (support on one side) 11a Upper end (one end) 11b Lower end (other end) 11c Pin engagement hole 12 Fastening section 13 Cross member 14 Floor-mounted cloth frame 15 Leading handrail brace 16 Locking hardware 21 Upper support (support on the other side) 21a Upper end (other end) 21b Lower end (one end) 22 Fastening section 23 Cross member 24 Floor-mounted cloth frame 25 Leading handrail brace 26 Locking hardware 30 Detachable tenon (connecting member for temporary scaffolding support) 31 Insertion section 32 Protrusion 33 Connection member body 34 Lock pin 35 Spring section 36 Pin section 37 Pin holes 38 Locking hole 40 Locking mechanism 41 Fixing pin 42 Fixed shaft part 43 Head 44 Pine Needle Pin 45 Shaft 46 Elastic clamping part 50 jack base 61 Jack base 62 H-beam pressure jig L1 Insertion length

Claims

1. A temporary scaffolding support connecting member for connecting one end of a cylindrical support on one side of a temporary scaffolding located on one side to one end of a cylindrical support on the other side of a temporary scaffolding located on the other side, the temporary scaffolding support connecting member being detachably attached to one end of the support on the one side, a cylindrical connecting member body having an insertion portion that is inserted from one end of the one-side support column into the interior of the one-side support column and a protrusion that protrudes from the one end of the one-side support column; and a locking mechanism that detachably locks the connecting member body to the one-side support column, A connecting member for temporary scaffolding columns, characterized in that the insertion length of the insertion portion into the one side column is an insertion length that makes the buckling strength of the connecting member for temporary scaffolding columns equal to or greater than the buckling strength when the connecting member for temporary scaffolding columns is fixed to one end of the one side column by welding.

2. 2. A connecting member for temporary scaffolding posts according to claim 1, characterized in that the insertion length of the insertion portion into the post on one side is 235 mm or more and 400 mm or less.

3. The connecting member for temporary scaffolding posts described in claim 1 or 2, characterized in that the locking mechanism is composed of a lock pin that is arranged within the insertion portion and has pin portions at both ends of a spring portion that protrude from the outer surface of the insertion portion, and the pin portions are removably locked to the post on one side.

4. A connecting member for temporary scaffolding posts as described in claim 1 or 2, characterized in that the locking mechanism is composed of a fixing pin that is inserted through the one side post and the insertion portion, and a pine needle pin that prevents the fixing pin from coming out.

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