Suspended scaffolding

Abstract

This invention provides a suspended scaffold that can easily hold beam materials at a specific angle, simplifying installation and enabling efficient work. [Solution] The beam material 4a comprises a beam material body portion 40 and a mounting member 40A, the mounting member 40A having a fixing portion 40B and a rotation support portion 40C, the beam material body portion 40 is provided with a body portion side hole portion 41c at a position offset from the rotation axes O1, O2, and the rotation support portion 40C is provided with a rotation support portion side hole portion 411b at a position that overlaps with the body portion side hole portion 41c when the beam material body portion 40 is held at a specific angle, and the stopper member 415 has an insertion portion 415b that can be inserted into these and a biasing means 415d, the insertion portion 415b is automatically inserted by the biasing force of the biasing means 415d into the body portion side hole portion 41c that overlaps with the rotation support portion side hole portion 411b when the beam material body portion 40 rotates and reaches a specific angle, the rotation of the beam material body portion 40 stops and it is held at a specific angle, thus forming a suspended scaffold 4.

Description

Technical Field

[0001] The present invention relates to a suspended scaffold, and particularly to a suspended scaffold configured by installing scaffold boards on the upper surface of beam members.

Background Art

[0002] Conventionally, during new construction, inspection, repair, renovation work, reinforcement work, etc. of structures such as bridges, a suspended scaffold for work may be installed on the lower side of the structure.

[0003] As such a suspended scaffold, there is known a type that can be constructed by connecting and adding beam members, rotating them in the horizontal direction to deploy them, then installing scaffold boards on the upper surface thereof, and can be assembled without using an aerial work platform or the like (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, after the beam members are rotated and deployed, it is necessary to hold the beam members in that position. Conventionally, some kind of fixing work for holding the beam members has been required, and there has been a demand for simplifying this to enable efficient work execution.

[0006] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a suspended scaffold that can easily hold beam members at a specific angle, simplify installation work, and enable efficient work execution.

Means for Solving the Problems

[0007] To achieve the above objective, the present invention provides a suspended scaffold suspended from a structure above, wherein a scaffolding board is provided on the upper surface of a pair of beam members to which a connected object can be connected at least one end, the beam members comprising a beam member body portion and a mounting member provided at one end of the beam member body portion for connecting and attaching to the connected object, the mounting member having a fixing portion for connecting and fixing to the connected object, and a rotating support portion that supports the beam member body portion so as to be rotatable horizontally about a vertical rotation axis when the fixing portion is connected and fixed to the connected object, the beam member body portion having a body portion side hole portion at a position offset from the rotation axis, and the rotating support portion having a body portion side hole portion when the beam member body portion is held at a specific angle with respect to the rotating support portion The suspended scaffold is characterized by having a rotating support side hole provided at an overlapping position, and a stopper member comprising an insertion portion that can be inserted into the main body side hole and the rotating support side hole, and a biasing means that biases the insertion portion in the direction of insertion into the rotating support side hole, wherein the insertion portion is biased toward the beam material main body when inserted into the rotating support side hole, and is configured to be automatically inserted into the main body side hole that overlaps with the rotating support side hole by the biasing force of the biasing means when the beam material main body rotates and reaches the specific angle, and the rotation of the beam material main body is stopped and it is held in the specific angle state by the stopper member being held with the insertion portion inserted into both the rotating support side hole and the main body side hole.

[0008] Furthermore, in addition to the configuration described above, the present invention is characterized in that the beam material body is made of a pipe material with a substantially circular cross-section, the stopper member is configured such that when the angle of the beam material body with respect to the rotation support is other than a specific angle, the insertion portion is pressed against the beam material body by the biasing force of the biasing means, the insertion portion moves while being pressed against the surface of the beam material body as the beam material body rotates, and when the rotation of the beam material body reaches the specific angle, it is automatically inserted into the side hole of the body that overlaps with the side hole of the rotation support by the biasing force of the biasing means, thus forming a suspended scaffold.

[0009] Furthermore, in addition to the configuration described above, the present invention is characterized in that the stopper member is configured to detach from the beam material body by moving the insertion portion from the main body side hole in the opposite direction to the insertion direction against the biasing force of the biasing means, thereby making the beam material body rotatable.

[0010] Furthermore, in addition to the configuration described above, the present invention is characterized in that the stopper member has a rod-shaped portion bent into a J-shape to form a long portion and a short portion as an insertion portion, and a helical spring-shaped biasing means inserted through the long portion of the rod-shaped portion, and the rotating support portion has a hole for the long portion through which the long portion is inserted, and the short portion is inserted into the hole for the long portion and the rotating support portion side hole, and the biasing means inserted through the long portion biases the short portion toward the beam material main body.

[0011] Furthermore, in addition to the configuration described above, the present invention is characterized in that the main body side hole is provided on the one end side of the beam material main body from the rotation axis, the rotation support side hole is provided at a position that overlaps with the main body side hole when the beam material main body is held at the specific angle, and the long section hole is provided at a position away from the one end of the beam material main body with respect to the rotation axis, thereby providing a suspended scaffold. [Effects of the Invention]

[0012] According to the present invention, when the beam material body reaches a specific angle with respect to the rotation support portion, the insertion portion of the stopper member is automatically inserted into the side hole of the main body to maintain that specific angle. As a result, the beam material can be easily held at a specific angle, simplifying the installation work and enabling efficient work.

[0013] Furthermore, according to the present invention, when the beam material body, which is made of pipe material, rotates, the insertion part moves while being pressed against the surface of the beam material body, and when it reaches a specific angle, the insertion part is automatically inserted into the side hole of the body. As a result, the insertion part can be inserted into the side hole of the body more smoothly, and the beam material can be held at a specific angle more easily.

[0014] Furthermore, according to the present invention, the stopper member can be detached from the beam material body simply by moving the insertion portion inserted into the side hole of the main body against the biasing force of the biasing means, and the detachment of the stopper member from the beam material body can also be performed with a simple operation.

[0015] Furthermore, according to the present invention, since the stopper member has a J-shaped rod-shaped portion and a biasing means of a helical spring, the beam material can be reliably held at a specific angle with a simple configuration.

[0016] Further, according to the present invention, the body portion side hole into which the short portion of the stopper member is inserted is provided on one end side relative to the rotation shaft, and the long portion hole through which the long portion of the stopper member is inserted is provided at a position spaced apart from one end portion of the beam material main body portion with respect to the rotation shaft, so that a configuration can be achieved in which the stopper member does not impede the rotation of the beam material main body portion, and the rotation angle of the beam material main body portion can be maximized to the fullest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] [Figure 1] It is a front view showing a state in which the scaffolding according to the embodiment of the present invention is installed on a bridge. [Figure 2] It is a perspective view for explaining the assembly of the scaffolding of Fig. 1. [Figure 3] It is a partially enlarged perspective view showing the connection portion of the scaffolding of Fig. 1 from an obliquely upper side. [Figure 4] It is a partially enlarged front view showing the connection portion of the scaffolding of Fig. 1 from the front side. [Figure 5] It is a perspective view showing the joint portion between the vertical scaffolding and the suspended scaffolding in the scaffolding of Fig. 1 (the stopper member is not shown). [Figure 6] (a) is a plan view showing the upper flange portion provided on the vertical pipe member forming the side portion of the vertical scaffolding, and (b) is a plan view showing the lower flange portion provided on the vertical pipe member forming the side portion of the vertical scaffolding. [Figure 7] It is a perspective view showing the beam material forming the suspended scaffolding according to the present embodiment. [Figure 8] It is a front view of the beam material of Fig. 7. [Figure 9] It is a side view of the beam material of Fig. 7. [Figure 10] It is an enlarged perspective view of part A in Fig. 7. [Figure 11] It is a partially enlarged view showing the end portion of the beam material of Fig. 8 with a partial breakaway and enlargement, and is a diagram showing the state when the beam material main body portion is rotating. [Figure 12] It is a partially enlarged view showing the end portion of the beam material of Fig. 8 with a partial breakaway and enlargement, and is a diagram showing the state where the beam material main body portion is held at a specific angle. [Figure 13] It is a single-part perspective view showing the stopper member of the beam member according to the present embodiment. [Figure 14] It is a front view of the stopper member of Fig. 13. [Figure 15] It is a side view of the stopper member of Fig. 13. [Figure 16] (a) is a perspective view showing the state before connection of the reinforcing beam member to the suspended scaffold, and (b) is a perspective view showing the state after connection of the reinforcing beam member to the suspended scaffold. [Figure 17] It is an explanatory view for explaining the construction steps of the method for constructing the scaffold of Fig. 1. [Figure 18] It is an explanatory view for explaining the construction steps of the method for constructing the scaffold of Fig. 1. [Figure 19] It is an explanatory view for explaining the construction steps of the method for constructing the scaffold of Fig. 1. [Figure 20] It is an explanatory view for explaining the construction steps of the method for constructing the scaffold of Fig. 1. [Figure 21] It is an explanatory view for explaining the construction steps of the method for constructing the scaffold of Fig. 1. [Figure 22] It is an enlarged perspective view showing the state of the rotation support portion of the mounting member when the beam member main body portion according to the present embodiment rotates. [Figure 23] It is an enlarged perspective view showing the state of the rotation support portion of the mounting member when the beam member main body portion according to the present embodiment is in the held state. [Figure 24] It is an enlarged perspective view showing the state of the rotation support portion of the mounting member when the beam member main body portion according to the present embodiment is detached. [Figure 25] It is a schematic diagram showing the transition of the movement state of the insertion portion of the stopper member of the beam member according to the present embodiment. [Mode for Carrying Out the Invention]

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to Fig. 1 to Fig. 25.

[0019] Figure 1 is a front view showing a scaffolding according to an embodiment of the present invention installed on a bridge. Figure 2 is a perspective view illustrating the combination of scaffolding in Figure 1. Figure 3 is a partially enlarged perspective view showing the connection portion of the scaffolding in Figure 1 from an oblique upper side. Figure 4 is a partially enlarged front view showing the connection portion of the scaffolding in Figure 1 enlarged from the front side.

[0020] As shown in Figures 1 to 4, the scaffolding 1 of this embodiment has a configuration in which four suspended scaffolding 4A to 4D are connected below the bridge girder 2b of the bridge 2, between vertical scaffolding 3, 3 that are erected rising from the ground to the side of the bridge pier 2a of the bridge 2.

[0021] Of these, the vertical scaffolding 3 is the connected body to which the suspended scaffolding 4 is connected. As shown in Figure 2, it is formed using vertical pipe members 3a, horizontal pipe members 3b, and diagonal pipe members 3c, which are vertical structural members, to form a rectangular cylindrical side, and multiple scaffolding boards 3d for vertical scaffolding are supported at predetermined height positions inside.

[0022] Furthermore, as shown in Figure 2, the suspended scaffolding 4 (4A~4D) is configured with a scaffolding board 4b for the suspended scaffolding installed above a pair of beam members 4a, 4a, and suspended from the bridge girder 2b of the bridge 2 by a chain 5 as a suspension means.

[0023] Furthermore, as shown in Figure 1, the vertical scaffolding 3 and the suspended scaffolding 4 (4A-4D) are connected such that the upper surface of the scaffolding board 3d for the uppermost vertical scaffolding of the vertical scaffolding 3 and the upper surface of the scaffolding board 4b for the suspended scaffolding of the suspended scaffolding 4 (4A-4D) are approximately flush.

[0024] In Figures 3 and 4, the upper surface of the second vertical scaffolding board 3d from the top of the vertical scaffolding 3 and the upper surface of the suspended scaffolding board 4b of the suspended scaffolding 4 are connected so that they are approximately flush.

[0025] As shown in Figure 5, the vertical pipe material 3a forming the side of the vertical scaffolding 3 is provided with an upper flange portion 31 and a lower flange portion 32 for connecting the ends of the beam material 4a of the suspended scaffolding 4, and an engaging member 33 for engaging the ends of the brace material 47 of the suspended scaffolding 4.

[0026] As shown in Figures 5 and 6(a), the upper flange portion 31 has a shape with bulging pieces 31a in a cross shape approximately perpendicular to the vertical pipe material 3a, and each bulging piece 31a is provided with an insertion hole 31b.

[0027] As shown in Figures 5 and 6(b), the lower flange portion 32 is located below the upper flange portion 31 and has a shape with bulging pieces 32a in a cross shape in the same direction as the upper flange portion 31, substantially perpendicular to the vertical pipe material 3a, and each bulging piece 32a is provided with an insertion hole 32b.

[0028] As shown in Figure 5, the engaging member 33 is provided between the upper flange portion 31 and the lower flange portion 32, and has a shape in which bulging pieces 33a are oriented in a cross shape in a direction different from that of the upper flange portion 31 and the lower flange portion 32, substantially perpendicular to the vertical pipe material 3a, and each bulging piece 33a is provided with an insertion hole 33b.

[0029] On the other hand, the pair of beam members 4a that form the suspended scaffolding 4 have a common configuration, and as shown in Figures 7 to 10, they consist of a beam member body portion 40 and mounting members 40A provided at both the left and right ends thereof. Furthermore, the mounting member 40A consists of a fixing portion 40B for attaching the beam member 4a to the vertical scaffolding 3 which is the connected body, and a rotating support portion 40C that supports the beam member body portion 40 so that it can rotate horizontally around vertical rotation axes O1 and O2 while the fixing portion 40B is connected to and fixed to the vertical scaffolding 3 which is the connected body.

[0030] As shown in Figures 10 and 22 to 25, the beam body 40 of this embodiment is made of a pipe material with a substantially circular cross-section, and has an upper horizontal frame member 41, a lower horizontal frame member 42, and a truss member 44 that connects and reinforces the space between the upper horizontal frame member 41 and the lower horizontal frame member 42. The mounting member 40A has an upper mounting member 41a and a lower mounting member 42a. Further details will be provided below.

[0031] Upper mounting members 41a, which constitute mounting members 40A, are provided at both the left and right ends of the upper horizontal frame member 41 that makes up the main beam member portion 40.

[0032] The upper mounting member 41a has an upper mounting piece 411 and a lower mounting piece 412 that constitute the upper rotating support portion 40C, and a connecting insertion portion 413 with an insertion slit 413b that constitutes the upper fixing portion 40B. Of these, the upper mounting piece 411 is configured to contact the upper surface of the end of the upper horizontal frame material 41. The lower mounting piece 412 is configured to contact the lower surface of the end of the upper horizontal frame material 41.

[0033] Furthermore, as shown in Figures 5, 6, 11, and 12, the connecting insertion part 413 has an insertion slit 413b into which the bulging piece 31a of the upper flange portion 31 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3 is inserted, and the wedge member 31c can be inserted into the insertion hole 413a of the connecting insertion part 413 and the insertion hole 31b of the upper flange portion 31.

[0034] As a result, the bulging piece 31a of the upper flange portion 31 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3 is inserted into the connecting insertion portion 413, and the wedge member 31c is inserted into the communicating insertion holes 413a and 31b, so that the end of the upper horizontal frame material 41 of the beam material 4a is connected to the vertical pipe material 3a.

[0035] Furthermore, the upper mounting piece 411 and the lower mounting piece 412 of the upper mounting member 41a have rotatable mounting holes 411a and 412a.

[0036] Furthermore, lower mounting members 42a, which constitute mounting members 40A, are provided at both the left and right ends of the lower horizontal frame member 42 that constitutes the main beam member portion 40.

[0037] The lower mounting member 42a has an upper mounting piece 421 and a lower mounting piece 422 that constitute the lower rotating support portion 40C, and a downward projection 423 that constitutes the lower fixing portion 40B. Of these, the upper mounting piece 421 is configured to contact the upper surface of the end of the lower horizontal frame material 42. The lower mounting piece 422 is configured to contact the lower surface of the end of the lower horizontal frame material 42.

[0038] Furthermore, as shown in Figures 5, 11, and 12, the downward-facing projection 423 protrudes downward so that it can be inserted into the insertion hole 32b of the bulging piece 32a in the lower flange portion 32 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3.

[0039] Furthermore, the upper mounting piece 421 and lower mounting piece 422 of the lower mounting member 42a have rotatable mounting holes 421a and 422a.

[0040] The ends of the end vertical frame material 43, which has a hollow portion, are inserted and connected to the rotatable mounting hole 412a of the lower mounting piece 412 of the upper mounting member 41a and the rotatable mounting hole 421a of the upper mounting piece 421 of the lower mounting member 42a, respectively. The upper mounting member 41a and the lower mounting member 42a are connected by this end vertical frame material 43, forming the mounting member 40A.

[0041] Furthermore, the bolt 416 is inserted from the pivot mounting hole 411a side of the upper mounting piece 411 of the upper mounting member 41a to the pivot mounting hole 422a of the lower mounting piece 422 of the lower mounting member 42a, passing through the insertion holes 41b, 42b at the ends of the upper horizontal frame member 41 and the lower horizontal frame member 42, and through the end vertical frame member 43, and its lower end is screwed in and secured with a nut 417.

[0042] As a result, when the mounting member having an upper mounting member 41a and a lower mounting member 42a is connected to the vertical pipe material 3a that forms the side of the vertical scaffolding 3, the beam material body portion 40 of the beam material 4a is rotatable horizontally around the bolt 416 relative to the upper mounting member 41a and the lower mounting member 42a.

[0043] Here, as shown in Figures 11 and 12, the rotatable mounting hole 411a of the upper mounting piece 411 of the upper mounting member 41a and the rotatable mounting hole 422a of the lower mounting piece 422 of the lower mounting member 42a, through which the bolt 416 is inserted, have approximately the same diameter.

[0044] Furthermore, the central axis O1 of the rotatable mounting hole 411a of the upper mounting piece 411 of the upper mounting member 41a is located closer to the vertical pipe material 3a, and the central axis O2 of the rotatable mounting hole 422a of the lower mounting piece 422 of the lower mounting member 42a is located closer to the beam material 4a, with a horizontal offset between them.

[0045] As a result, when the beam material 4a is connected to the vertical pipe material 3a, a gap C1 is created between the bolt 416 and the pivot mounting hole 411a on the upper mounting piece 411 side of the upper mounting member 41a, and a gap C2 is created between the bolt 416 and the beam material 4a side of the pivot mounting hole 422a on the lower mounting piece 422 side of the lower mounting member 42a, and between the bolt 416 and the beam material 4a.

[0046] Furthermore, as shown in Figures 11 and 12, in the lower mounting member 42a, the lower mounting piece 422 is formed to be longer than the upper mounting piece 421, so that the lower mounting piece 422 contacts the lower horizontal frame material 42 over a longer area than the upper mounting piece 421.

[0047] Furthermore, the suspended scaffolding 4 of this embodiment has a beam member holding mechanism equipped with a stopper member 415 that holds the beam member 4a at a specific angle. This will be described in detail below.

[0048] First, the upper horizontal frame member 41 of the beam member body 40 is provided with a main body side hole 41c at a position offset from the insertion hole 41b through which the bolts 416, which will serve as the rotation axes O1 and O2, are inserted. Here, the main body side hole 41c is provided on the upper surface of the upper horizontal frame member 41. In cases where the shape of the stopper member 415, which will be described in detail later, is longer, the main body side hole 41c may be provided not only on the upper surface of the upper horizontal frame member 41, but also on the lower surface at the same position perpendicular to the upper surface.

[0049] Furthermore, the upper mounting piece 411 constituting the upper rotating support portion 40C is provided with a rotating support portion side hole 411b at a position that overlaps with the main body portion side hole 41c when the upper horizontal frame material 41 of the beam material main body portion 40 is held at a specific angle relative to the upper rotating support portion 40C. Here, the main body portion side hole 41c and the rotating support portion side hole 411b are configured to overlap when the longitudinal direction of the beam material main body portion 40 coincides with the longitudinal direction of the upper mounting piece 411 at a specific angle.

[0050] Furthermore, in this embodiment, a stopper member 415 is provided on the upper rotating support portion 40C for holding the upper horizontal frame 41 of the beam material body portion 40 at a specific angle. As shown in Figures 11 to 15, the stopper member 415 in this embodiment is composed of a J-shaped rod portion 415a, a helical spring-shaped biasing means 415d, a spring retaining plate 415e for supporting the biasing means 415d, and a pin-shaped portion 415f for supporting the spring retaining plate 415e.

[0051] Of these, the rod-shaped portion 415a comprises a short portion 415b and a long portion 415c that are bent into a J-shape to form an insertion portion. The J-shape of the rod-shaped portion 415c may be formed in a rounded shape as shown in Figures 11 to 15, or it may be bent in a roughly U-shape with corners.

[0052] Furthermore, a helical spring-shaped biasing means 415d is fitted and held at the tip end of the elongated portion 415c of the rod-shaped portion 415a. In addition, to prevent the biasing means 415d from coming off the rod-shaped portion, a spring retaining plate 415e is provided on the tip end of the elongated portion 415c where the biasing means 415d is fitted, so as to abut against the biasing means, and a pin-shaped portion 415f is inserted into a hole provided on the tip side of the elongated portion 415c to prevent the spring retaining plate 415e from coming off.

[0053] The stopper member 415, having this configuration, is configured such that its elongated portion 415c is inserted through a hole 411c for the elongated portion provided in the upper mounting piece 411 of the upper rotation support portion 40C, and another hole 412c for the elongated portion provided in the lower mounting piece 412 at the same position perpendicular to the said hole 411c. Furthermore, the biasing means 415d is configured to be positioned below the hole 412c for the elongated portion of the lower mounting piece 412 and to contact it, thereby generating a downward biasing force on the stopper member 415.

[0054] Then, by holding the short portion 415b inserted into the side hole 411b of the rotating support portion, the short portion (insertion portion) 415b of the stopper member 415 is biased toward the upper horizontal frame 41 within the side hole 411b of the rotating support portion. Here, as shown in Figures 22 and 25, the stopper member 415 is configured such that when the angle of the upper horizontal frame 41 with respect to the upper rotating support portion 40C is other than a specific angle, the short portion 415b is pressed against the surface of the upper horizontal frame 41 by the biasing force of the biasing means 415d.

[0055] Then, when the beam body portion 40 is rotated around the bolts 416 which become the rotation axes O1 and O2, the upper transverse frame 41 rotates around the bolts 416, and as shown in Figures 22, 23, and 25, the short portion 415b moves while being pressed against the surface of the upper transverse frame 41 as it rotates, and when the rotation of the upper transverse frame 41 reaches a specific angle, in this case, an angle in which the longitudinal direction of the beam body portion 40 coincides with the longitudinal direction of the upper mounting piece 411, the main body side hole portion 41c and the rotation support side hole portion 411b overlap. As shown in Figures 12 and 23, the short portion 415b of the stopper member 415, which is inserted into the side hole 411b of the rotating support part and pressed against the surface of the upper horizontal frame 41, is automatically inserted into the side hole 41c of the main body part. The state in which the stopper member 415 has its insertion portion 415b inserted into both the side hole 411b of the rotating support part and the side hole 41c of the main body part is held by the biasing force of the biasing means 415d, stopping the rotation of the beam material main body part 40 and fixing it in place at a specific angle.

[0056] Here, as shown in Figures 11, 12, and 22-24, the main body side hole 41c in this embodiment is located one end side (to the right of the bolt 416 in Figure 11) of the position of the bolt 416 which is the rotation axis O1, O2 of the upper horizontal frame 41. The rotation support side hole 411b is located at a position that overlaps with the main body side hole 41c when the upper horizontal frame 41 is held at a specific angle. The long section holes 411c and 412c are located at a position away from one end of the upper horizontal frame 41 relative to the bolt 416 which is the rotation axis O1, O2 (further to the right of the right end of the upper horizontal frame 41 in Figure 11). As a result, the stopper member 415 does not obstruct the rotation of the upper horizontal frame 41 when it rotates, and the upper horizontal frame 41 and the beam material main body 40 can rotate at a large angle.

[0057] Furthermore, as shown in Figure 24, the stopper member 415 can be easily detached from the upper horizontal frame 41 by moving the short portion 415b in the opposite direction (upward) to the direction in which it was inserted (downward) from the side hole 41c of the main body, against the biasing force of the biasing means 415d. This configuration allows the upper horizontal frame 41 and the beam material main body 40 to be easily rotated again.

[0058] Next, the method for constructing the scaffolding 1 of this embodiment will be described.

[0059] First, in constructing the vertical scaffolding 3, as shown in Figure 1, vertical pipe members 3a, horizontal pipe members 3b, and diagonal pipe members 3c are erected from the ground and assembled on the side of the bridge pier 2a of the bridge 2, and then multiple levels of scaffolding boards 3d are supported at a predetermined height to complete the structure.

[0060] Next, we will explain how to construct the first suspended scaffolding, 4A.

[0061] When constructing the first suspended scaffolding 4A, the connection work is first carried out on the beam member 4a that is not engaged with the brace member 47.

[0062] In other words, as shown in Figures 11, 12 and 17-19, the downward projection 423 of the lower mounting member 42a on one end of the beam member 4a is inserted into the insertion hole 32b of the lower flange portion 32 provided in the vertical pipe member 3a that forms the side of the vertical scaffolding 3.

[0063] Furthermore, by inserting the connecting insertion portion 413 of the upper mounting member 41a on one end of the beam material 4a into the upper flange portion 31 provided on the vertical pipe material 3a and connecting them with a wedge member 31c, one end of the beam material 4a is connected to the vertical pipe material 3a that forms the side of the vertical scaffolding 3.

[0064] In this case, the beam material 4a is already folded towards the vertical scaffolding 3, and the worker holds its base and rotates it 90 degrees horizontally (to a specific angle) so that the other end faces the opposing vertical scaffolding 3. Then, as shown in Figures 22, 23, and 25, the short portion 415b of the stopper member 415 is inserted into the side hole 411b of the rotation support part and moves along the surface of the upper horizontal frame 41 while being pressed against the surface of the upper horizontal frame 41. When it reaches a 90-degree horizontal position (a specific angle), it is automatically inserted into the side hole 41c of the main body part by the biasing force of the biasing means 415d, which has reached a position overlapping with the side hole 411b of the rotation support part, and the biasing force of the biasing means 415d holds it in the inserted state in both holes 411b and 41c. As a result, the main body part 40 of the beam material can be held and fixed at a specific angle without the need for any special action. Furthermore, in the following operations as well, when the beam material body 40 is to be positioned at a specific angle, the stopper member 415 of this embodiment automatically holds and fixes it at that specific angle.

[0065] Next, the connection work is carried out on the beam member 4a to which the brace member 47 is engaged.

[0066] In other words, as shown in Figures 20 and 21, the downward projection 423 of the lower mounting member 42a on one end of the beam member 4a is inserted into the insertion hole 32b of the lower flange portion 32 provided in the vertical pipe member 3a that forms the side of the vertical scaffolding 3.

[0067] Furthermore, by inserting the connecting insertion portion 413 of the upper mounting member 41a on one end of the beam material 4a into the upper flange portion 31 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3, and connecting them with a wedge member 31c, one end of the beam material 4a is connected to the vertical pipe material 3a that forms the side of the vertical scaffolding 3.

[0068] At this time, the beam member 4a and the brace member 47 are already folded towards the vertical scaffolding 3. The worker takes the other end of the brace member 47 and rotates it horizontally by 90 degrees so that the other end of the beam member 4a faces the opposing vertical scaffolding 3. Once it is parallel to the already connected beam member 4a, the worker engages the insertion recess 47b on the other end of the brace member 47 with the protrusion 33b of the engaging member 33 provided on the vertical pipe member 3a, and engages the movable engaging portion 472 of the insertion recess 47b with the engaging hole 33c of the protrusion 33b of the engaging member 33 provided on the vertical pipe member 3a to engage it, thereby connecting the brace member 47 to the vertical pipe member 3a.

[0069] Then, by fitting the mounting fitting portions 48 provided at both the left and right ends of the first suspended scaffolding board 4b onto the upper surface of the upper horizontal frame member 41 of the pair of beam members 4a, 4a, multiple first scaffolding boards 4b are provided on the upper side of the pair of beam members 4a, 4a.

[0070] Next, as shown in Figure 16, the horizontal reinforcing beam member 4a' is placed diagonally between the dedicated support columns 45, 45 at the other end of the pair of beam members 4a, 4a. The downward projection 423 of the lower mounting member 42a is inserted into the insertion hole 452a of the lower flange portion 45c of these dedicated support columns 45, and then the upper flange portion 45b of the dedicated support column 45 is inserted into the connecting insertion portion 413 of the upper mounting member 41a to attach it.

[0071] Then, a chain 5 is installed as a suspension means between the suspension means fixing part 455 at the upper end of the dedicated support column 45 and the bridge girder 2b of the bridge 2, and the construction of the first suspended scaffolding 4A is completed.

[0072] Next, the second suspended scaffolding 4B is installed by connecting it to the first suspended scaffolding 4A. However, the only difference between the second suspended scaffolding 4B and the first suspended scaffolding 4A is that the point where the pair of beam members 4a, 4a are connected is that in the first suspended scaffolding 4A, the vertical pipe members 3a of the vertical scaffolding 3 are connected to the dedicated support columns 45 of the first suspended scaffolding 4A, which are different connected components. Therefore, a detailed explanation is omitted.

[0073] Furthermore, the third suspended scaffolding 4C is constructed using the same method as the second suspended scaffolding 4B, so its explanation will be omitted.

[0074] Next, the fourth suspended scaffolding 4D is connected to the vertical scaffolding 3 from the third suspended scaffolding 4C, with the brace members 47 not engaged with either of the pair of beam members 4a, 4a.

[0075] Furthermore, neither of these pairs of beam members 4a, 4a has a dedicated support column 45 at its tip.

[0076] In this case, all of these beam members 4a are already folded towards the third suspended scaffolding 4C, and the worker holds their base and rotates them horizontally by 90 degrees so that the other end faces the opposing vertical scaffolding 3, and the stopper member 415 automatically holds and fixes them at a specific angle.

[0077] Furthermore, a worker waiting on the scaffolding board 3d for the opposing vertical scaffolding 3 inserts the downward projection 423 of the lower mounting member 42a on the other end of the beam members 4a into the insertion hole 32b of the lower flange portion 32 provided in the vertical pipe member 3a that forms the side of the opposing vertical scaffolding 3.

[0078] Furthermore, the upper flange portion 31 provided on the vertical pipe material 3a that forms the side of the opposing vertical scaffolding 3 is inserted into the connecting insertion portion 413 of the upper mounting member 41a on one end of these beam material 4a, so that one end of these beam material 4a is connected to the vertical pipe material 3a that forms the side of the opposing vertical scaffolding 3.

[0079] Furthermore, the worker on the scaffolding board 4b for the suspended scaffolding of the third suspended scaffolding 4C and the worker on the scaffolding board 3d for the vertical scaffolding of the opposing vertical scaffolding 3 each hold the end of the brace member 47 and connect it to the brace member engagement flange portion 45d of the dedicated support column 45 of the third suspended scaffolding 4C and to the engagement member 33 provided on the vertical pipe member 3a that forms the side of the opposing vertical scaffolding 3 to which one end of the beam member 4a is connected.

[0080] Then, by fitting the mounting fitting portions 48 provided at both the left and right ends of the scaffolding board 4b for the fourth suspended scaffolding onto the upper surface of the upper horizontal frame material 41 of these beam materials 4a, 4a, multiple scaffolding boards 4b for the fourth suspended scaffolding are installed on the upper side of these beam materials 4a, 4a, and the construction of the fourth suspended scaffolding 4D is completed.

[0081] Next, the operation and effects of this embodiment will be described.

[0082] With the scaffolding 1 configured as described above, the beam members 4a can be easily connected by inserting the lower downward projection 423 into the insertion hole 32b of the lower flange portion 32 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3, or into the insertion hole 452a of the lower flange portion 45c of the dedicated support column 45, and inserting the upper connecting insertion portion 413 into the upper flange portion 31 provided on the vertical pipe material 3a that forms the side of the vertical scaffolding 3, or into the upper flange portion 45b of the dedicated support column 45, and fixing them with the wedge member 31c. This makes it possible to easily construct the suspended scaffolding 4 (4A, 4B, 4C) in relation to the vertical scaffolding 3 or suspended scaffolding 4 (4A, 4B, 4C) that has already been constructed.

[0083] In this scaffolding 1, the fixing portion of the beam material 4a (the connecting insertion portion 413 and downward projection 423 in the upper mounting member 41a and lower mounting member 42a that constitute the mounting member) and the rotation support portion (the upper mounting pieces 411, 421 and the lower mounting pieces 412, 422) are located in different positions. Therefore, the force applied downward is distributed without being concentrated, and the scaffolding can be made durable enough to be used repeatedly over a long period of time.

[0084] Furthermore, with this scaffolding 1, the beam material 4a can be easily connected to the vertical pipe material 3a or dedicated support column 45 by simply inserting the downward projection 423, which is the lower fixing part of the lower mounting member 42a, into the insertion holes 32b, 452a provided in the vertical pipe material 3a or dedicated support column 45, and then attaching and fixing the connecting insertion part 413, which is the upper fixing part of the upper mounting member 41a, to the upper flange parts 31, 45b provided in the vertical pipe material 3a or dedicated support column 45, resulting in good workability.

[0085] Furthermore, with this scaffolding 1, the beam member 4a without the brace member 47 is mainly unfolded by hand by holding the base and fixed with a pin 415, and the beam member 4a with the brace member 47 is unfolded by holding the brace member 47 by hand and fixing the end of the brace member 47, and then the scaffolding board 4b is attached to the upper surface of this pair of beam members 4a, 4a. This procedure increases the horizontal structural strength and also offers excellent workability.

[0086] Furthermore, with this scaffolding 1, a horizontal reinforcing beam 4a' is provided between the dedicated support columns 45, 45, which increases the overall structural strength of the suspended scaffolding 4 (4A~4D).

[0087] Furthermore, according to this scaffolding 1, as shown in Figures 9 and 10, the central axis O1 of the pivot mounting hole 411a of the upper mounting piece 411 of the upper mounting member 41a is located closer to the vertical pipe material 3a, and the central axis O2 of the pivot mounting hole 422a of the lower mounting piece 422 of the lower mounting member 42a is located closer to the beam material 4a, and a horizontal offset is provided between them. As a result, even during construction when workers are standing on it before the chain 5 as a lifting means is installed between the lifting means fixing part 455 at the upper end of the dedicated support column 45 and the bridge girder 2b of the bridge 2, the suspended scaffolding 4 has cantilever strength that prevents it from sagging downwards.

[0088] Furthermore, with this scaffolding 1, as shown in Figures 11 and 12, the lower mounting piece 422 of the lower mounting member 42a is formed to be longer than the upper mounting piece 421, and the lower horizontal frame member 42 makes contact over a longer area, so that it can withstand a larger load F, and the suspended scaffolding 4 can have greater cantilever strength, making it less likely to sag downwards even during construction when workers are standing on it before the chain 5 as a suspension means is installed between the suspension means fixing part 455 at the upper end of the dedicated support column 45 and the bridge girder 2b of the bridge 2.

[0089] Furthermore, according to this embodiment, when the beam material body portion 40 reaches a specific angle with respect to the rotation support portion 40C, the insertion portion 415b of the stopper member 415 is automatically inserted into the side hole portion 41c of the body portion to maintain that specific angle. As a result, the beam material 4 can be easily held at a specific angle, simplifying the installation work and enabling efficient work.

[0090] Furthermore, according to this embodiment, when the beam material body portion 40, which is made of pipe material, rotates, the insertion portion 415b is pressed against the surface of the beam material body portion 40 as it moves, and when it reaches a specific angle, the insertion portion 415b is automatically inserted into the main body side hole portion 41c. As a result, the insertion portion 415b can be inserted into the main body side hole portion 41c more smoothly, and the beam material 4 can be held at a specific angle more easily.

[0091] Furthermore, according to this embodiment, the stopper member 415 can be detached from the beam material body 40 simply by moving the insertion portion 415b, which is inserted into the main body side hole 41c, against the biasing force of the biasing means 415d, and the detachment of the stopper member 415 from the beam material body 40 can also be performed with a simple operation.

[0092] Furthermore, according to this embodiment, since the stopper member 415 has a J-shaped rod portion 415a and a biasing means 415d of a helical spring, it is possible to reliably hold the beam material 4 at a specific angle with a simple configuration.

[0093] Furthermore, according to this embodiment, the main body side hole 41c into which the short portion 415b of the stopper member 415 is inserted is provided on one end side of the rotation axis O1, O2, and the long portion hole 411c through which the long portion 415c of the stopper member 415 is inserted is provided at a position away from one end of the beam material main body 40 with respect to the rotation axis O1, O2. As a result, the stopper member 415 does not obstruct the rotation of the beam material main body 40, and the rotation angle of the beam material main body 40 can be maximized.

[0094] Although embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

[0095] For example, in the above embodiment, an example was described in which the chain 5 as a suspension means is provided only between the suspension means fixing part 455 and the bridge girder 2b. However, the invention is not limited to this, and the chain 5 as a suspension means may also be provided between other parts of the beam 4a and the bridge girder 2b, etc.

[0096] Furthermore, the dedicated support columns 450, which are intermediate members of the suspended scaffolding 4 (4A to 4I), may be used as vertical scaffolding or the like.

[0097] Furthermore, the stopper member 415 of the present invention can be applied in various situations, such as connecting a vertical scaffold (connected body) 3 and a suspended scaffold 4, connecting suspended scaffolds 4 together (one of the suspended scaffolds being the connected body), and connecting scaffolds with steps (one of the scaffolds being the connected body).

[0098] Furthermore, in the above-described embodiment, a J-shaped member was used as the stopper member and a helical spring-shaped member was used as the biasing means, but this is not limited to these, and the stopper member may have a shape other than J-shape, and does not have to be rod-shaped. In addition, the biasing means may also be a leaf spring or any other appropriate configuration depending on the configuration.

[0099] Furthermore, in the above-described embodiment, the stopper member was positioned such that the swing range of the beam material body 40 was maximized. However, this is not the only option. For example, the long portion of the stopper member may be positioned not far from one end of the beam material body 40, but within the rotation angle of the beam material body 40, thereby intentionally limiting the rotation angle. In this case, angle limitation and holding and fixing at a specific angle can be achieved using only the stopper member of the present invention, without the need to install a separate stopper when angle limitation is desired. [Explanation of symbols]

[0100] 1. Scaffolding 2. Bridges (structures) 2a Bridge pier 2b Bridge girder 3. Vertical scaffolding 3a Vertical pipe material (connected object) Scaffolding planks for 3D vertical scaffolding 4. Suspended scaffolding 4A~4D Suspended scaffolding 4a Beam material 40 Beam material main body 41a Upper mounting member (mounting member) 42a Lower mounting member (mounting member) 41c Main body side hole 413 Connecting insertion part (fixing part) 423 Downward projection (fixing part) 411 Upper mounting piece (rotation support part) 421 Upper mounting piece (rotation support part) 412 Lower mounting piece (rotation support part) 422 Lower mounting piece (rotation support part) 411b Side hole of the rotating support part 411c Hole for long part 4b Scaffolding planks for suspended scaffolding 45 Dedicated support column (connected object) 47. Brace material 455 Part for fixing the suspension means 456 Mortise and tenon fitting (connecting member) 4a' Reinforcement beam material 5. Chain (suspension method) 415 Stopper component 415a Rod-shaped part 415b Short section (insertion section) 415c Long section 415d Biasing mechanism (helicopter spring) 415e Spring retaining plate 415f Pin-shaped part O1, O2 rotation axis

Claims

1. A suspended scaffold is provided on the upper surface of a pair of beam members to which a connected body can be attached at least one end, and is suspended from a structure provided above. The beam material comprises a beam material body and a mounting member provided at one end of the beam material body for connecting and attaching to the object to be connected. The mounting member has a fixing portion for connecting to and securing the object to be connected, and a rotating support portion that supports the beam material body so that it can rotate horizontally around a vertical rotation axis while the fixing portion is connected to and secured to the object to be connected. The main body of the beam material is provided with a side hole at a position offset from the axis of rotation. The rotating support portion is provided with a rotating support portion side hole at a position that overlaps with the main body portion side hole when the beam material main body portion is held at a specific angle relative to the rotating support portion, and has a stopper member comprising an insertion portion that can be inserted into the main body portion side hole and the rotating support portion side hole, and a biasing means that biases the insertion portion in the direction of insertion into the rotating support portion side hole. The insertion portion is biased toward the beam material body while inserted into the side hole of the rotation support portion, and is configured to be automatically inserted by the biasing force of the biasing means into the side hole of the body portion that overlaps with the side hole of the rotation support portion when the beam material body portion rotates and reaches the specific angle. A suspended scaffold characterized in that the stopper member is held in a state in which the insertion portion is inserted into both the side hole of the rotation support portion and the side hole of the main body portion, thereby stopping the rotation of the beam material main body portion and holding it in the state of the specific angle.

2. The main body of the beam material is made up of a pipe material that is roughly circular in cross-section, The stopper member is configured such that when the angle of the beam material body with respect to the rotation support is other than a specific angle, the insertion portion is pressed against the beam material body by the biasing force of the biasing means, and as the beam material body rotates, the insertion portion moves while being pressed against the surface of the beam material body, and when the rotation of the beam material body reaches the specific angle, it is automatically inserted into the side hole of the body that overlaps with the side hole of the rotation support by the biasing force of the biasing means, as described in claim 1.

3. The stopper member is configured to detach from the beam member body by moving the insertion portion from the main body side hole in the opposite direction to the insertion direction against the biasing force of the biasing means, thereby enabling the beam member body to rotate, as described in claim 1.

4. The stopper member has a rod-shaped portion that is bent into a J-shape to form a long portion and a short portion that serves as the insertion portion, and a helical spring-shaped biasing means that is inserted through the long portion of the rod-shaped portion. The rotating support portion has a hole for inserting the elongated portion, The suspended scaffolding according to claim 1, characterized in that the long portion is inserted into the hole for the long portion and the short portion is inserted into the side hole of the rotating support portion, and the short portion is biased toward the beam material body portion by the biasing means inserted into the long portion.

5. The aforementioned hole in the main body is provided on the side of the beam material main body that is on the side of the rotation axis to the one end, The side hole of the rotating support portion is provided in a position that overlaps with the side hole of the main body portion when the beam material main body portion is held at the specific angle. The suspended scaffolding according to claim 4, characterized in that the hole for the long section is provided at a position away from one end of the beam material body with respect to the rotation axis.

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