Fastening structure of horizontal frame for temporary scaffold

Abstract

To provide a structure for fastening horizontal frames of a temporary scaffold which is easy to assemble and disassemble, in which the fastened part does not easily become loose due to shaking during work.SOLUTION: An embodiment of the present invention comprises: a hanging portion that forms a through-opening with an opening at the top and bottom by means of a hanging attachment provided on a pillar material and a pillar material of a scaffold support; an insertion support provided on an end portion of a horizontal frame and inserted into the opening of the hanging portion; and a fastening attachment that acts on the hanging portion and the insertion support inserted into the opening of the hanging portion to tighten the insertion support against the hanging portion. The insertion support is provided with: an insertion portion that is inserted into the opening of the hanging portion in a state where it is loosely fitted into the hanging portion; and a support portion having an engaging portion that restricts movement of the insertion support in the insertion direction relative to the hanging attachment by contacting the insertion portion with the hanging attachment in a state where the insertion portion is inserted into the opening.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a fastening structure for a cross member for fixing a cross member to a scaffold support column constituting a temporary scaffold used at a construction site or the like.

Background Art

[0002] Conventionally, at a construction site of a house, a building, etc., in order to safely and efficiently carry out work at a high place, a temporary scaffold composed of a scaffold support column, a cross member fixed to the scaffold support column, a tread board laid on the cross member, and a reinforcing brace is installed. The cross member constitutes the entire erected scaffold by being fixed to the scaffold support column. Further, since the cross member forms a work floor for workers by laying a tread board or is used as a handrail for workers, it is necessary to firmly fix it to the scaffold support column.

[0003] Therefore, wedge-shaped insertion portions are provided at both ends of the cross member, and the insertion portions are inserted into a latching portion formed by a column member of the scaffold support column and a U-shaped latching metal fitting fixed to the column member in a plan view. The insertion portions are press-fitted by hitting them with a tool such as a hammer from above, and a wedge-type fastening scaffold that is easy to assemble while realizing a strong fastening by strongly pressing the inside of the latching portion has been widely used in recent years.

[0004] However, when a worker rides on the tread board and works, the temporary scaffold will sway to some extent. The sway that occurs in the temporary scaffold gradually weakens the compression of the latching portion by the insertion portion, and there is a risk that the entire temporary scaffold will become fragile or the cross member will come off from the latching portion.

[0005] Naturally, if the fastening between the scaffold support column and the cross member weakens and the temporary scaffold becomes fragile, the safety will be impaired. In addition, the worker needs to drive the insertion portion again with a tool and press it in again in parallel with the construction work, which also leads to a decrease in work efficiency.

[0006] Therefore, Patent Document 1 and Patent Document 2 disclose a fastening structure of a wedge-type fastening scaffold provided with a retaining body inside the wedge main body provided at the end of the horizontal member. Specifically, like the conventional wedge-type fastening scaffold, fastening is performed by driving the wedge main body into the hanging portion of the scaffold support column. Further, the retaining body provided inside the wedge main body is also driven in from above in the same manner as the wedge main body and press-fitted into a part of the hanging portion to perform stronger fastening.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, the fastening structure of the wedge-type fastening scaffold described in Patent Document 1 and Patent Document 2 performs fastening not only by the wedge main body but also by the retaining body, so it has a double fastening structure and enables stronger fastening than the conventional fastening structure of the wedge-type fastening scaffold. On the other hand, the fastening structure of the wedge-type fastening scaffold described in Patent Document 1 and Patent Document 2 is configured to perform the fastening by press-fitting wedges provided at both ends of the horizontal member into the hanging portion of the scaffold support column in the same manner as the conventional fastening structure of the wedge-type fastening scaffold.

[0009] Therefore, when disassembling the temporary scaffold, even if the fastening state is released, there is a drawback that although slightly due to the self-weight of the horizontal member and the wedge main body itself, pressure is applied between the inner side of the hanging portion, and it cannot be smoothly removed from the hanging portion. This drawback requires a certain amount of force by straddling when the worker removes the horizontal member from the hanging portion, which may cause an accident in high-place work.

[0010] The present invention has been made in view of the above problems, and an object thereof is to provide a fastening structure for a horizontal member that is easy to assemble and disassemble a temporary scaffold and is less likely to loosen the fastening portion due to swaying during work.

Means for Solving the Problems

[0011] In order to solve the above conventional problems, the fastening structure of the horizontal member of the present invention includes a hanging portion formed in a substantially U-shaped cross section penetrating vertically on the peripheral surface of a column, a horizontal member that is horizontally spanned between columns with both ends being freely hung on the hanging portions of adjacent columns, and a fixed leg body vertically provided at an end of the horizontal member that is engageable with the substantially U-shaped hanging portion. The hollow fixed leg body at the end of the horizontal member is formed at the upper edge of the opening of the hanging fitting so as to be engageable with the insertion portion of the horizontal member, and can be inserted into the hollow portion of the hanging fitting. Further, a wedge rod can be inserted into the hollow portion of the fixed leg body from above, and the fixed leg body at the end of the horizontal member is engaged and fixed in the hanging portion through the wedge function of the wedge rod.

[0012] Further, the wedge rod has a fastening function portion in which a fastening bending portion is formed by bending the lower end portion of the wedge rod. The fixed leg body has a support bending portion formed by bending the lower end portion of the fixed leg body in the same direction as the fastening bending portion. When the insertion portion of the insertion support portion is inserted into the opening portion and the wedge rod is pressed down, the support bending portion presses the fastening function portion in the bending direction of the support bending portion, thereby acting on the fixed leg body with respect to the hanging portion and fastening it.

[0013] Further, it is characterized in that the fall of the wedge rod due to its own weight is restricted by hooking a hooking portion formed near the upper end portion of the wedge rod on a hooking receiving portion formed so as to protrude from the upper edge portion of the fixed leg body.

Effects of the Invention

[0014] According to the present invention, the assembly and disassembly of the temporary scaffold can be facilitated, and even when the fastened state is loosened, the horizontal member can be prevented from completely coming off.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0016] The gist of the present invention is constituted by a hanging portion having a substantially U-shaped cross section that penetrates vertically on the peripheral surface of a support column, a cross member that is horizontally spanned between the support columns with both ends being freely hung on the hanging portions of adjacent support columns, a fixed leg body vertically provided at the end of the cross member that can be engaged with the substantially U-shaped hanging portion, and the hollow fixed leg body at the end of the cross member is formed on the upper edge of the opening of the hanging fitting so as to be able to engage the insertion portion of the cross member. It can be inserted into the hollow portion of the hanging fitting, and a wedge rod can be inserted into the hollow portion of the fixed leg body from above, and the fixed leg body at the end of the cross member is engaged and fixed in the hanging portion through the wedging function of the wedge rod.

[0017] Hereinafter, with reference to the accompanying drawings, an embodiment of the fastening structure M of the scaffold member according to the present invention will be described. The following embodiment is an example embodying the present invention and does not limit the technical scope of the present invention.

[0018] FIG. 1 is a schematic front view showing the horizontal member 3, with the pipe material 31 constituting the horizontal member 3 omitted in the middle. FIG. 2 is a schematic perspective view showing the scaffolding support column 4, enlarged to show a part including the latching portion 43. Therefore, in the scaffolding support column 4, the column material 41 shown in FIG. 2 is actually long in the vertical direction, and a plurality of latching portions 43 are provided in the vertical direction at regular intervals. FIG. 3 is a schematic front view of the fastening structure M of the horizontal member, with the interior shown by hidden lines. FIG. 4(a) is a schematic front view of the fixed leg 1, with the interior shown by hidden lines. FIG. 4(b) shows a schematic left side view of the fixed leg 1. FIG. 4(c) is a schematic right side view of the fixed leg 1, and the imaginary line shown by the two-dot chain line indicates the pipe material 31. FIG. 5(a) is a schematic plan view showing the fixed leg 1, with the insertion portion 1b forming the lower half of the fixed leg 1 omitted. FIG. 5(b) is a schematic bottom view of the fixed leg 1, with the support portion 1a forming the upper half of the fixed leg 1 omitted. FIG. 6(a) is a schematic front view of the wedge bar 2, showing the state of the rivet receiving hole 22 and the rivet 221 inserted into the rivet receiving hole 22 by hidden lines. FIG. 6(b) is a schematic right side view of the wedge bar 2, showing the state of the rivet receiving hole 22 and the rivet 221 inserted into the rivet receiving hole 22 by hidden lines. FIG. 7(a) shows the state before inserting the fastening structure M of the horizontal member into the latching portion 43 of the scaffolding support column 4, and FIG. 7(b) shows the state after inserting the fastening structure M of the horizontal member into the latching portion 43 of the scaffolding support column 4. FIG. 8 is a schematic cross-sectional view showing the support state A of the fastening structure M of the horizontal member. FIG. 9 is a schematic cross-sectional view showing the locked state B of the fastening structure M of the horizontal member. FIG. 10 is a schematic cross-sectional view showing the tightened state C of the fastening structure M of the horizontal member.

[0019] The fastening structure M of the horizontal member according to the present invention (hereinafter simply referred to as the fastening structure M) is provided at the end 311 of the horizontal member 3 for fastening to the latching portion 43 provided on the scaffold support column 4 constituting the temporary scaffold as shown in FIG. 1. Specifically, the horizontal member 3 is formed of a pipe member 31 made of metal such as steel having a certain length and the fastening structure M provided at both ends 311 of the pipe member 31. Hereinafter, the fastening structure M will be described by taking the one provided on the left side of both ends 311 of the horizontal member 3 as an example. Note that the description of the fastening structure M provided on the right side is omitted because it is a mirror image of the following description. Further, when explaining the fastening structure M, the surfaces shown in FIGS. 1, 3, 4(a) and 6(a) will be described as the front surfaces.

[0020] As shown in FIG. 2, the scaffold support column 4 is composed of a column member 41 having a substantially circular cross section extending in the vertical direction and a latching metal fitting 42 having a substantially U-shape in plan view fixed to the column member 41. The latching metal fitting 42 has the open side of the U-shape as a welding portion 421 and is welded to the column member 41 of the scaffold support column 4. Further, the latching metal fitting 42 is formed such that the surface facing the welding portion 421 (hereinafter referred to as the inclined surface 422) is inclined downward when viewed from the direction in which the welding portion 421 is located on the left side.

[0021] The latching metal fitting 42 forms a latching portion 43 that forms a through-shaped opening 431 that is open at the top and bottom by welding to the column member 41. The fastening structure M can fix the horizontal member 3 to the scaffold support column 4 by being inserted into the opening 431 of the latching portion 43 and fastened.

[0022] The fastening structure M according to the present embodiment is composed of a fixing leg body 1 inserted into the latching portion 43 of the scaffold support column 4 and a wedge rod 2 inserted into the space S of the fixing leg body 1 described later, as shown in FIGS. 1 and 3.

[0023] As shown in FIGS. 4 and 5, the fixed leg body 1 includes a contact surface portion 11 that contacts the support member 41 when inserted into the opening 431 of the latching portion 43, a support surface portion 12 (see FIG. 4(a)) that forms the front and rear surface portions of the fixed leg body 1 by bending the front and rear side edges of the contact surface portion 11 90 degrees in a direction away from the support member 41, an insertion surface portion 13 (see FIG. 5(a)) formed by bending the contact surface portion 11 90 degrees in a direction away from the support member 41, and a welding surface portion 14 (see FIG. 4(a)) welded to the support surface portion 12 so as to face the contact surface portion 11.

[0024] As shown in FIG. 4(b), the contact surface portion 11 is composed of a substantially octagonal portion and a rectangular portion extending from the octagonal portion. The octagonal portion is formed in a direction such that any two opposing sides of the eight sides are horizontal. That is, the rectangular portion is formed by extending the lower side of the octagonal portion downward. Further, the lower end portion of the contact surface portion 11 has a support bending portion 111 bent rightward in a V-shape in a front view (see FIG. 4(a)).

[0025] In a plan view shown in FIG. 5(a), the contact surface portion 11 forms a curved portion 112 with the central portion curved inward (rightward in the drawing). This curved portion 112 is the portion that contacts the support member 41 when the fixed leg body 1 is inserted into the latching portion 43. By forming the contact portion in a curved shape, it can contact the surface of the support member 41 in a surface contact manner, which has the effect of enabling a strong fastening. Further, at the lower portion of the curved portion 112, there is an avoidance opening portion 113 which is an elliptical opening. This avoidance opening portion 113 enables the wedge rod 2 to be partially released into the avoidance opening portion 113 so that the insertion can be smoothly performed when the fixed leg body 1 is inserted into the opening 431 of the latching portion 43.

[0026] Among the support surface portions 12 that form the front and rear surface portions of the fixed leg body 1, the support surface portion 12 located on the front surface is composed of a vertically long rectangular upper half portion and a substantially triangular lower half portion extending from the lower portion of the rectangular upper half portion and having a width that becomes narrower toward the bottom in a front view shown in FIG. 4(a).

[0027] The lower half of the substantially triangular shape forms a left side that is substantially vertical in a front view, and the right side slopes downward and leftward from a position slightly inside (leftward in the figure) the lower right corner of the upper rectangular part of the support surface portion 12. That is, in a front view, a step is formed by the right side of the rectangular upper part protruding rightward at the boundary between the lower side of the rectangular upper part and the upper side of the substantially triangular lower part. This step functions as a locking portion 121 for locking to the locking portion 43, which will be described in detail later.

[0028] Also, among the two front and rear support surface portions 12, the support surface portion 12 located on the rear surface of the fixed leg body 1 has the same shape as the support surface portion 12 located on the front surface and forms the rear surface of the fixed leg body 1.

[0029] As shown in Fig. 5(a), the insertion surface portion 13 is a surface extending the upper side of the octagonal portion of the contact surface portion 11 rightward. This insertion surface portion 13 is formed narrower than the width of the support surface portion 12. Therefore, in a plan view, a U-shaped notch portion with an open portion facing the right side is formed. The U-shaped notch portion, which will be described in detail later, is closed by the hooking receiving portion 143 of the welding surface portion 14, and in a plan view, a wedge rod insertion portion 131, which is a square opening facing downward, is formed.

[0030] As shown in Fig. 4(c), the welding surface portion 14 is made of a separate member from the above-described contact surface portion 11, support surface portion 12, and insertion surface portion 13, and is integrated with the contact surface portion 11, support surface portion 12, and insertion surface portion 13 by welding inside the right edge of the upper half of the support surface portion 12 in a front view.

[0031] As shown in Fig. 4(c), the welding surface portion 14 has an octagonal portion similar to the contact surface portion 11, which is a facing surface, and is composed of a convex portion with the upper side of the octagonal portion slightly extended and a rectangular portion with the lower side of the octagonal portion extended.

[0032] The rectangular part with the lower side extended has the extended length reaching the lower part of the rectangular part of the support surface portion 12. Further, the lower end portion of the welding surface portion 14, that is, the lower end portion of the rectangular part, has a bent portion 141 bent 90 degrees to the left as shown in Fig. 4(a). Furthermore, as shown in the bottom view of Fig. 5(b), this bent portion 141 has a wedge bar restricting portion 142 formed by a notch portion with a combined rectangular and arc shape at the central portion. The width of the wedge bar restricting portion 142 is formed to be wider than the wedge bar main body portion 21 of the wedge bar 2 described later and narrower than the fastening functional portion 24.

[0033] As described above, the convex portion with the upper side slightly extended closes the open portion of the U-shaped notch portion formed by the insertion surface portion 13 in the plan view shown in Fig. 5(a), and together with the U-shaped portion, forms a wedge bar insertion portion 131 which is a rectangular opening. Furthermore, as shown in Fig. 4, the convex portion protrudes slightly more than the insertion surface portion 13, and this protruding portion is used as a hook receiving portion 143. The details of the wedge bar insertion portion 131 and the hook receiving portion 143 will be described later.

[0034] As shown in Fig. 4(a), the fixed leg body 1 has a space S inside formed by a portion that becomes a U-shaped cross-section when cut horizontally by the contact surface portion 11 and the support surface portion 12, and a welding surface portion 14 welded to cover the open portion of the U-shaped portion, and the wedge bar 2 can be inserted into this space S.

[0035] As shown in Figs. 1, 3, 4, and 5, the fixed leg body 1 welds the octagonal portion of the welding surface portion 14 and the end portion 311 of the pipe material 31 to be integrated. Note that the circular opening indicated by the reference numeral 144 in Figs. 4(b) and 4(c) is a welding hole 144 provided at the central portion of the octagon of the contact surface portion 11 and the welding surface portion 14 of the fixed leg body 1 and functions for alignment during welding.

[0036] As shown in Fig. 4, the fixed leg body 1 has the upper half (the rectangular part in the front view) as the support portion 1a and the lower half (the substantially triangular part in the front view) as the insertion portion 1b.

[0037] As shown in FIGS. 7 to 10, the insertion portion 1b of the fixed leg body 1 is a portion that is inserted into the opening 431 of the latching portion 43 from above. This insertion portion 1b is formed to be slightly smaller than the size of the opening 431 and is in a state with play without pressing the inner surface of the latching portion 43 in the inserted state.

[0038] As shown in the right side view of FIG. 6(b), the wedge bar 2 includes a wedge bar main body portion 21 having a constant thickness in the depth direction, a rivet receiving hole 22 provided near the upper end of the wedge bar main body portion 21 and allowing insertion of a rivet 221, a hooking portion 23 formed below the rivet receiving hole 22, and a fastening functional portion 24 extending from the lower end of the wedge bar main body portion 21.

[0039] As shown in FIG. 6(a), the rivet receiving hole 22 is a through hole having a shape combining a frustum of a cone and a cylinder according to the shape of the rivet 221. The rivet 221 inserted into the rivet receiving hole 22 has an effect of preventing the wedge bar 2 from falling downward from the fixed leg body 1 due to its own weight by coming into contact with the hooking receiving portion 143 of the fixed leg body 1 in a state where the wedge bar 2 is inserted into the fixed leg body 1.

[0040] As shown in FIG. 6, the hooking portion 23 is a protruding portion located directly below the rivet receiving hole 22 provided in the wedge bar main body portion 21, and in the front view shown in FIG. 6(a), it includes an inclined portion 231 protruding downward and inclined to the right from the right side surface portion of the wedge bar main body portion 21 and an extending portion 232 extending downward from the lower end portion of the inclined portion 231. The hooking portion 23 is a portion that hooks onto the hooking receiving portion 143 of the fixed leg body 1. Therefore, the gap between the right side surface portion of the wedge bar main body portion 21 and the extending portion 232 is formed to be slightly wider than the thickness of the hooking receiving portion 143.

[0041] As shown in FIG. 6, the fastening functional portion 24 is a portion extending from the lower part of the wedge bar main body portion 21 and has a width larger than that of the wedge bar main body portion 21 in the side view shown in FIG. 6(b). Also, in the front view shown in FIG. 6(a), it has a fastening bent portion 241 bent in a U shape to the right at a position corresponding to about one-third of the lower part of the fastening functional portion 24.

[0042] As shown in FIGS. 1 and 3, the wedge rod 2 forms a fastening structure M together with the fixed leg 1 in a state of being inserted into the space S of the fixed leg 1. The fastening functional part 24 has a width wider than that of the wedge rod regulating part 142 which is a notch formed in the welding surface part 14. Therefore, even if the wedge rod 2 is lifted upward, the fastening functional part 24 can prevent the wedge rod 2 from coming out upward from the fixed leg 1 by interfering with the wedge rod regulating part 142. That is, when storing or moving the single cross member 3 not fixed to the scaffold support 4, the fixed leg 1 and the wedge rod 2 can be prevented from separating.

[0043] Next, three states of the fastening structure M, namely, the supporting state A, the locking state B, and the fastening state C, will be described. Also, the wedge rod 2 that directly functions in the fastening will take three positions, namely, the hooking position a, the retaining position b, and the fastening press-fitting position c, in the supporting state A, the locking state B, and the fastening state C, respectively.

[0044] As shown in FIG. 7, the fastening structure M is inserted from above the opening 431 of the latching part 43 to perform fastening. At this time, the fastening structure M is in a state where the hooking part 23 of the wedge rod 2 is hooked on the hooking receiving part 143 of the fixed leg 1, or the fastening functional part 24 of the wedge rod 2 that has moved to the lower part of the fixed leg 1 by its own weight is moved to the side of the avoidance opening 113 provided in the contact surface part 11 of the fixed leg 1 so that the wedge rod 2 moving downward by its own weight does not prevent the insertion. Note that the position of the wedge rod 2 with the hooking part 23 hooked on the hooking receiving part 143 as described above is the hooking position a.

[0045] As shown in FIG. 8, the supporting state A is a state where the insertion part 1b of the fixed leg 1 is inserted into the opening 431 of the latching part 43 with the wedge rod 2 at the hooking position a. At this time, the fixed leg 1 is in a state where only the insertion part 1b is inserted into the latching part 43 because the locking part 121 of the fixed leg 1 abuts against the upper edge part of the latching fitting 42. That is, the locking part 121 restricts the movement of the fixed leg 1 in the insertion direction with respect to the latching part 43.

[0046] The inserted state of the insertion part 1b is in a loose-fitting state because the size of the insertion part 1b is formed to be slightly smaller than that of the latching part 43. Also, the insertion part 1b inserted into the latching part 43 is in a penetrating state where the lower end part, particularly the support bending part 111, protrudes downward from the latching part 43 in the inserted state.

[0047] The wedge rod 2 is supported without contacting the latching part 43 by hooking the hooking part 23 to the hooking receiving part 143 of the fixed leg body 1. Therefore, when the wedge rod 2 is at the hooking position a, no stress that functions for tightening by the wedge rod 2 is exerted at all.

[0048] That is, the supporting state A is a state where the insertion part 1b of the fixed leg body 1 is inserted into the latching part 43 of the scaffold support 4, but there is no stress related to any fixing, and the entire cross member 3 is supported only by the contact of the locking part 121 with the upper edge part of the latching part 43.

[0049] The locked state B is a state where the position of the wedge rod 2 is displaced from the supporting state A to the retaining position b. More specifically, it is a state where the hooking part 23 is removed from the hooking receiving part 143 and the wedge rod 2 has dropped to the lower part of the fixed leg body 1 due to its own weight. At this time, the position where the wedge rod 2 has dropped due to its own weight is set as the retaining position b.

[0050] As shown in FIG. 9, when the wedge rod 2 is at the retaining position b, the tightening function part 24 at the lower end has dropped to the lower part of the fixed leg body 1 due to its own weight. In this state, the wedge rod 2 is only in a state where the tightening bending part 241 of the tightening function part 24 is in contact with and supported by the support bending part 111 of the fixed leg body 1.

[0051] Also, the wedge rod 2 is supported such that the lower end part of the tightening bending part 241 is pushed out in the right direction, that is, toward the center of the cross member 3, due to the inclination of the bent part of the support bending part 111. Therefore, the tightening bending part 241 will be in a state of protruding outward from the lower edge part of the latching fitting 42.

[0052] Therefore, even if the horizontal member 3 is lifted upward when the fastening structure M is in this locked state B, the fastening bent portion 241 of the wedge bar 2 interferes with the lower edge portion of the hooking fitting 42, and the insertion portion 1b of the fixed leg body 1 cannot be pulled upward from the hooking portion 43. That is, the fastening structure M is locked to the hooking portion 43 so that the horizontal member 3 does not separate from the scaffold support 4, and the collapse of the temporary scaffold during work on the temporary scaffold can be prevented.

[0053] As shown in FIG. 10, the fastening state C of the fastening structure M is a state in which the wedge bar 2 is driven in from above, and the wedge bar 2 is positioned further below the range where it can move by its own weight to perform fastening with the hooking portion 43. The position of the wedge bar 2 in this fastening state C is defined as the fastening press-fitting position c.

[0054] The wedge bar 2 performs fastening between the hooking portion 43 and the fastening structure M due to the action of interference points that interfere between the fixed leg body 1 and the hooking portion 43 when the wedge bar 2 is at the fastening press-fitting position c. Specifically, there are three interference points, namely, the first interference point P1, the second interference point P2, and the fourth interference point P4, between the wedge bar 2 and the fixed leg body 1, and further, there is one interference point, namely, the third interference point P3, between the wedge bar 2 and the hooking portion 43.

[0055] The first interference point P1 is the contact portion between the insertion surface portion 13 side of the wedge bar insertion portion 131 and the left side surface portion of the wedge bar main body portion 21. This first interference point P1 has the effect of holding the wedge bar 2 in an upright posture with respect to the insertion surface portion 13.

[0056] The second interference point P2 is the contact portion between the support bent portion 111 formed on the contact surface portion 11 of the fixed leg body 1 and the fastening bent portion 241 formed on the fastening functional portion 24 of the wedge bar 2. Similar to the first interference point P1, this second interference point P2 has the effect of causing the wedge bar 2 to take an upright posture and the effect of pressing the wedge bar 2 in the right direction by the support bent portion 111.

[0057] The third interference point P3 is the contact part between the inner lower surface of the inclined surface 422 of the engaging fitting 42 that constitutes the engaging portion 43 and the engaging bent portion 241 of the fastening functional portion 24 of the wedge bar 2. This third interference point P3 has the effect of pressing the inclined surface 422 of the engaging fitting 42 from the inside by the fastening functional portion 24.

[0058] By pressing the wedge bar 2 in the right direction, a strong pressure is applied at the third interference point P3, that is, between the fastening functional portion 24 of the wedge bar 2 and the engaging portion 43.

[0059] Also, due to the reaction of the pressure related to the third interference point P3, the lower part of the wedge bar 2 generates a stress in the left direction. That stress is transmitted to the contact surface portion 11 of the fixed leg body 1 through the first interference point P1 and the second interference point P2, and the contact surface portion 11 of the fixed leg body 1 presses the column member 41 of the scaffold support 4 with a force equivalent to the pressure between the fastening functional portion 24 and the engaging portion 43.

[0060] That is, in the state where the fixed leg body 1 is inserted into the engaging portion 43 of the scaffold support 4, by driving the wedge bar 2 downward with a tool or the like and press-fitting it, vitality is applied to the first interference point P1, the second interference point P2, and the third interference point P3, and strong fastening can be performed.

[0061] The fourth interference point P4 is the contact part between the rivet 221 inserted into the rivet receiving hole 22 of the wedge bar main body portion 21 and the hanging receiving portion 143 of the fixed leg body 1. This fourth interference point P4 has the effect of restricting the movement of the wedge bar 2 downward from the fastening press-fitting position c.

[0062] By restricting the downward movement of the wedge bar 2 by the fourth interference point P4, it is possible to prevent the pressurization due to the self-weight of the wedge bar 2 and the excessive driving by the worker assembling the temporary scaffold. Also, when the fastening is not performed by the fastening structure M, there is an effect of preventing the wedge bar 2 from coming off the fixed leg body 1 and falling.

[0063] As described above, by changing the tightening structure M among the three states of the support state A, the locking state B, and the tightening state C, the assembly and disassembly of the scaffold can be facilitated. Specifically, when assembling the scaffold, similar to the conventional wedge-type tightened scaffold, the insertion portion 1b of the fixed leg 1 is inserted through the opening 431 of the latching portion 43 of the scaffold support 4, and the wedge rod 2 inserted into the fixed leg 1 can be simply driven in from above with a tool or the like and press-fitted.

[0064] Further, due to the action of the fourth interference point P4 in the tightened state C, the worker can visually judge how much the wedge rod 2 needs to be driven in to ensure tightening. Therefore, it is possible to prevent excessive tightening due to excessive driving of the wedge rod 2 and damage to the components of the tightening structure M.

[0065] In addition, the wedge rod 2 that functions to tighten the latching portion 43 of the scaffold support 4 is not integrated with the cross member 3 but is a separate member, so it is less susceptible to the influence of swinging during scaffold work compared to the wedge formed at the end of the conventional cross member, and there is an effect that the tightened state C is less likely to become loose.

[0066] Moreover, if loosening occurs in the tightened portion, the tightening structure M will be in the locking state B. This locking state B can prevent the wedge rod 2 that has dropped by its own weight inside the fixed leg 1 from interfering with the latching fitting 42 of the scaffold support 4 and the cross member 3 from coming off. Also, since the tightened state C can be visually confirmed due to the action of the fourth interference point P4, there is an effect that it is easier to detect loosening in the tightened portion even during work.

[0067] Also, when disassembling the scaffold, the tightened state C is released by pushing up the wedge rod 2 from below with a tool or the like. However, in order to completely remove the cross member 3 from the fixed state with the scaffold support 4, it is necessary to set the wedge rod 2 at the hooking position a and make the tightening structure M in the support state A. The support state A is simply a state where the locking portion 121 of the fixed leg 1 is in contact with the upper edge of the latching fitting 42 of the scaffold support 4. Therefore, the cross member 3 can be easily and completely removed from the fixed state with the scaffold support 4 just by lifting it.

[0068] Also, when workers assemble the scaffolding, they often view the fastening structure M from the front side as shown in FIGS. 1 and 2. At that time, it can be immediately seen that the support state A is a state in which the wedge rod 2 is inclined in the central direction (right direction in the figure) of the cross member 3. Therefore, it is possible to easily determine the difference between the locking state B in which the wedge rod 2 can be driven in from above and the support state A in which the wedge rod 2 cannot be physically driven in from above. Accordingly, it is possible to prevent damage to members that may occur when the wedge rod 2 is driven in the support state A and injuries to workers due to the reaction force.

[0069] The present invention relates to a fastening structure M of a cross member for fixing a cross member 3 to a scaffold support 4 constituting a temporary scaffold, the fastening structure M including: a latching portion 43 that forms a through-opening 431 with an upper and lower opening formed by a support member 41 of the scaffold support 4 and a latching fitting 42 provided on the support member 41; a fixing leg 1 provided at an end of the cross member 3 and inserted into the opening 431 of the latching portion 43; and a wedge rod 2 that acts on the latching portion 43 and the fixing leg 1 inserted into the opening 431 of the latching portion 43 to fasten the fixing leg 1 to the latching portion 43. The fixing leg 1 includes an insertion portion 1b that is inserted into the opening 431 in a state of being loosely fitted to the latching portion 43, and a support portion 1a that has a locking portion 121 that restricts movement of the fixing leg 1 in the insertion direction with respect to the latching portion 43 by coming into contact with the latching fitting 42 in a state where the insertion portion 1b is inserted into the opening 431. The fastening structure M of the cross member is characterized by comprising the above.

[0070] The description of the above-described fastening structure M of the cross member is an example of the present invention, and the present invention is not limited to the above-described embodiment. Therefore, it goes without saying that various modifications can be made according to the design and the like as long as they are within the scope not departing from the technical idea of the present invention even if they are outside the above-described embodiment. Further, the above-described various effects are merely a list of preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the present embodiment.

Explanation of Reference Numerals

[0071] M Fastening structure of cross member 1 Fixing leg 1a Support portion 1b Insertion part 11 Contact surface part 111 Support bending part 112 Curved part 113 Avoidance opening part 12 Support surface part 121 Locking part 13 Insertion surface part 131 Wedge bar insertion part 14 Welding surface part 141 Bending part 142 Wedge bar regulation part 143 Hanging receiving part 144 Welding hole S Space 2 Wedge bar 21 Wedge bar main body part 22 Rivet receiving hole 221 Rivet 23 Hanging part 231 Inclined part 232 Extension part 24 Tightening function part 241 Tightening bending part 3 Horizontal beam 31 Pipe material 311 End part 4 Scaffold support column 41 Support column material 42 Hanging fitting 421 Welding part 422 Inclined surface 43 Hanging part 431 Opening part A Support state a Hanging position B Locking state b Anti - removal position C Tightening state c Tightening press - fitting position P1 First interference point P2 Second interference point P3 Third interference point P4 Fourth interference point

Claims

1. A hanging portion formed on the circumferential surface of the support column and having a substantially U-shaped cross-section penetrating vertically up and down, A horizontal member that is horizontally spanned between the support columns by being able to hang both ends on the hanging portions of the adjacent support columns, A fixing leg body vertically provided at the end of the horizontal member that is engageable with the substantially U-shaped hanging portion, and further comprising, The hollow fixing leg body at the end of the horizontal member is formed on the upper edge of the opening of the hanging fitting to enable engagement with the insertion portion of the horizontal member, It can be inserted into the hollow portion of the hanging fitting, A wedge rod can be inserted into the hollow portion of the fixing leg body from above, and the fixing leg body at the end of the horizontal member is engaged and fixed in the hanging portion through the wedging function of the wedge rod. A tightening structure for the horizontal member in a temporary scaffold, characterized in that.

2. The wedge rod, It has a tightening function portion in which a tightening bending portion is formed by bending the lower end portion of the wedge rod, The fixing leg body, It has a support bending portion formed by bending the lower end portion of the fixing leg body in the same direction as the tightening bending portion, When the insertion portion of the insertion support portion is inserted into the opening portion and the wedge rod is pressed down, The support bending portion presses the tightening function portion in the bending direction of the support bending portion, so that the fixing leg body acts on the hanging portion and is tightened. The tightening structure for the horizontal member according to claim 1, characterized in that.

3. The hanging portion formed near the upper end of the wedge rod is hooked on a hanging receiving portion formed to protrude from the upper edge portion of the fixing leg body, thereby restricting the fall of the wedge rod due to its own weight. The tightening structure for the horizontal member according to claim 1 or claim 2, characterized in that.

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