Suspended scaffolding

Abstract

To provide a suspended scaffolding that allows for easy removal of fallen objects onto the scaffolding planks during work at height, without the need for large equipment. [Solution] The system includes multiple suspension frames 5 and scaffolding boards 6. Each suspension frame 5 comprises a vertical member 8 suspended from the outside of the railing of the structure and a horizontal member 9 extending from the vertical member 8 toward the railing. Scaffolding boards 6 are installed between the horizontal members 9, and a portion of the scaffolding boards 6' is a scaffolding board 6' for discharging fallen objects, having an openable and closable discharge port 67.

Description

TECHNICAL FIELD

[0001] The present invention relates to a suspended scaffolding used for operations such as repair and inspection of viaducts for railways, roads and the like.

BACKGROUND ART

[0002] Repair and inspection of viaducts for railways, roads and the like may extend from the outer side surface of the balustrade rising at the end of the deck slab to the lower surface of the deck slab. The outer side surface of the balustrade and the lower surface of the deck slab may not be viewable in detail from the bridge, and the operations are also difficult, so it is common to perform the operations using a gondola vehicle, rolling scaffolding from the ground, or scaffolding stacked from the ground. However, when a gondola vehicle cannot enter due to reasons such as the presence of buildings or structures on the ground at the site, or obstruction to traffic, or there is no room to erect scaffolding, suspended scaffolding is utilized. As an example of the suspended scaffolding, there is the suspended scaffolding as described in Patent Document 1.

[0003] This scaffolding has a plurality of frame members and scaffolding plates, each frame member has a hanging frame, an upper horizontal frame and a lower horizontal frame, and is substantially U-shaped in side view, and further has a structure in which a wall-resting support beam member protrudes from the middle of the hanging frame of the frame toward the outer surface of the outer vertical wall of the balustrade. The upper horizontal frame of the frame member has a clamping portion at an end portion for fixing the frame to the upper end of the balustrade. Then, with the hanging frame positioned on the outer side of the balustrade, the clamping portion of each frame member is engaged with the upper portion of the balustrade to suspend the frame member from the balustrade, and the tip of the wall-resting support beam member is brought into contact with the outer vertical wall of the balustrade, thereby preventing the frame member from rotating around the clamping portion with the balustrade, and the scaffolding plate is installed between the lower horizontal frames of the plurality of suspended frames.

[0004] In addition, when a scaffolding is also required at the vertically intermediate portion of the frame member, support beams are further protruded from the intermediate portion between the upper horizontal frame and the lower horizontal frame in the hanging frame, and a scaffolding plate is installed between the support beams of the plurality of frames.

PRIOR ART DOCUMENTS

PATENT DOCUMENTS

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-59632 [Overview of the project] [Problems that the invention aims to solve]

[0006] When performing repair or other work at heights using a suspended scaffolding as described in Patent Document 1, concrete fragments and other building material fragments may break off and fall onto the scaffolding planks. Depending on the type of work, building materials may also be removed or broken. Leaving such building material fragments unattended not only hinders work but can also lead to serious accidents, such as workers tripping and falling, or building material fragments falling to the ground after a worker trips over them.

[0007] Traditionally, the crane arm was extended above the scaffolding planks to lift and remove fallen objects from the planks. However, extending the arm above the planks of a suspended scaffolding erected at a high altitude required a massive crane, which not only increased costs but also made it impossible to even bring the crane in if there wasn't enough open space around the scaffolding installation site.

[0008] The present invention aims to provide a suspended scaffolding that allows for the easy removal of fallen objects onto the scaffolding planks during work at height without the need for large equipment. [Means for solving the problem]

[0009] To achieve the above objective, the suspended scaffolding of the present invention includes a plurality of suspension frames and scaffolding boards, each of which suspension frames comprises a vertical member suspended from the outside of the railing of a structure and a horizontal member extending from the vertical member toward the railing, the scaffolding boards are installed between the horizontal members, and a portion of the scaffolding boards is a scaffolding board for discharging fallen objects having an openable and closable discharge port.

[0010] Furthermore, it is preferable that the inner part of the scaffolding board for discharging fallen objects is an opening / closing lid, and that the opening / closing lid rotates on its outer edge as an axis to open and close the discharge port, and that a walkable portion that cannot be opened or closed is provided on the outside of the discharge port.

[0011] Furthermore, in this case, the inner end of the scaffolding board for removing falling objects may be set back further outward than the inner ends of other scaffolding boards.

[0012] The horizontal member includes a middle horizontal member provided in the upper and lower middle portion of the vertical member, and a lower horizontal member provided at the lower end of the vertical member. Scaffolding boards are installed on the middle horizontal member and the lower horizontal member, respectively, and a portion of the scaffolding board installed on the lower horizontal member may be the scaffolding board for removing fallen objects.

[0013] A portion of the scaffolding board installed on the aforementioned intermediate horizontal member can be used as the scaffolding board for removing falling objects. [Effects of the Invention]

[0014] According to the suspended scaffolding of the present invention, since an outlet is formed in a part of the scaffolding board, even if concrete fragments or the like fall onto the scaffolding board, the fallen objects on the scaffolding board can be dropped through the open outlet towards a transport vehicle or the like below, allowing for low-cost removal without the use of a large crane or the like.

[0015] By rotating the opening / closing lid around its outer edge as an axis, the discharge port can be opened and closed easily. Furthermore, if a walkable area is formed outside the discharge port, workers can move on the scaffolding even when the discharge port is open, increasing work efficiency. Moreover, since workers pass outside the discharge port where the vertical members of the suspension frame are installed, safety is enhanced.

[0016] If the inner end of the scaffolding plank used for removing fallen objects is set back further out than the inner ends of other scaffolding planks, the plank is less likely to get in the way when working on protruding parts such as the concrete covering of utility poles installed on the outside of the railing.

[0017] When a scaffolding board is also installed at the vertically intermediate portion of the vertical member, work becomes easier even for parapets with large vertical dimensions, falling objects can be easily removed through the discharge opening of the falling object discharge scaffolding board installed on the lower horizontal member, and additionally, when a falling object discharge scaffolding board is also installed on the intermediate horizontal member, falling objects can be removed even more efficiently. Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view of the suspended scaffolding showing the first embodiment of the present invention. [Figure 2] It is a side view of the suspended scaffolding showing the first embodiment of the present invention. [Figure 3] It is a plan view of the main part of the suspended scaffolding showing the first embodiment of the present invention. [Figure 4] It is a front view of the falling object discharge scaffolding board according to the first embodiment of the present invention. [Figure 5] It is a plan view of the falling object discharge scaffolding board according to the first embodiment of the present invention. [Figure 6] It is a side view of the falling object discharge scaffolding board according to the first embodiment of the present invention. [Figure 7] It is a side view of the suspended scaffolding showing the second embodiment of the present invention. [Figure 8] It is a front view of the suspended scaffolding showing the second embodiment of the present invention. [Figure 9] It is a side view of the suspended scaffolding showing the third embodiment of the present invention. [Figure 10] It is a perspective view of the suspended scaffolding showing the fourth embodiment of the present invention. [Figure 11] It is an enlarged front view of the main part of the suspended scaffolding according to the fourth embodiment of the present invention. [Figure 12] It is a side view of the suspended scaffolding showing the fourth embodiment of the present invention. Modes for Carrying Out the Invention

[0019] [First Embodiment] Hereinafter, the first embodiment of the present invention will be described in detail based on Fig. 1 to Fig. 6. As shown in Figures 1 to 3, in this embodiment, the suspended scaffolding 3 is installed on the railing 2 of the elevated bridge 1. The railing 2 is erected on both sides in the width direction of the elevated bridge 1. In the following explanation, the side of the suspended scaffolding 3 closest to the elevated bridge 1 is considered the inner side, the opposite side the outer side, and the direction perpendicular to the width direction is considered the longitudinal direction. Utility poles P are erected at appropriate locations inside the railing 2, and the outer perimeter of the utility poles P is covered with concrete projections 4 that protrude from the outer surface of the railing 2. The projections 4 are molded independently of the railing 2.

[0020] The suspended scaffolding 3 includes multiple suspension frames 5, scaffolding boards 6, and connecting horizontal members 7. The suspension frame 5 comprises a vertical member 8 suspended from the outside of the railing 2, and a horizontal member 9 that is fixed to the vertical member 8 at one end (referred to as the base) by welding and extends toward the railing 2. Each horizontal member 9 consists of an upper horizontal member 10 provided at the upper end of the vertical member 8, a middle horizontal member 11 provided in the middle in the vertical direction, and a lower horizontal member 12 provided at the lower end, so that the suspension frame 5 as a whole has an E shape when viewed from the side. The vertical member 8, the upper horizontal member 10, the middle horizontal member 11, and the lower horizontal member 12 are all channel materials or square pipes made of aluminum alloy or the like.

[0021] The upper horizontal member 10 has a reinforcing portion 13 formed on the vertically downward side of its base, which reinforces the welded portion with the vertical member 8. The reinforcing section 13 is a structure in which a brace 132 is attached at an angle to a frame structure composed of a front member 130, a horizontal member 131, an upper horizontal member 10, and a vertical member 8. A short hanging piece 14 is fixed by welding to the end (tip) of the upper horizontal member 10 opposite to the vertical member 8. The distance between the front member 130 of the reinforcing part 13 and the hanging piece 14 is slightly wider than the thickness of the upper part of the railing 2, and the engaging portion 15 formed between the two members is designed to engage with the upper part of the railing 2. An adjustment member 16 is attached to the tip of the horizontal member 131, allowing the amount of protrusion to be adjusted forward or backward.

[0022] The intermediate horizontal member 11 is supported from below by a stay 110, and the welded portion with the vertical member 8 is reinforced. The intermediate horizontal member 11 has approximately the same length as the horizontal member 131 in the reinforcing portion 13 of the upper horizontal member 10, and an adjustment member 16 that can adjust the amount of protrusion front to back is attached to its tip, forming the tip portion. In addition, a slip-prevention projection 111 is formed on the upper surface of the intermediate horizontal member 11 at a position approximately the width of two scaffolding boards 6 from the vertical member 8. The length of the central horizontal member 11 from its base to its tip is formed to be slightly shorter than the distance from the vertical member 8 to the protruding portion 4 of the railing 2.

[0023] The base of the lower horizontal member 12 is reinforced at the welded joint with the vertical member 8 by a brace 120 and a triangular plate 121 attached between it and the vertical member 8. In this embodiment, a rising member 122 is fixed to the tip of the lower horizontal member 12 by welding. An adjustment member 16 is attached to the upper end of the rising member 122, which allows adjustment of the amount of protrusion in the vertical direction. Furthermore, the lower horizontal member 12 extends below the railing 2, and is therefore longer than the middle horizontal member 11.

[0024] Furthermore, since the vertical dimensions of the railing 2 vary depending on the purpose and scale of the elevated bridge 1, the vertical dimensions of the suspension frame 5 are determined according to the elevated bridge 1 being constructed.

[0025] The suspension frame 5 extends from the inside of the railing 2 with the vertical member 8 facing outwards, engages the engagement portion 15 at the tip of the upper horizontal member 10 with the upper part of the railing 2, and then rotates towards the railing 2 side around the engagement portion 15 to suspend it from the outside of the railing 2. The multiple suspended suspension frames 5 are slid to align with markings previously marked on the railing 2, thereby positioning them at appropriate intervals. In this state, the adjustment member 16 provided on the engagement portion 15 is adjusted to fix the suspension frames 5 to the upper part of the railing 2. Multiple suspension frames 5 fixed to predetermined positions on the railing 2 are connected to each other by connecting horizontal members 7 made of steel pipes or the like between the vertical members 8, and by joining the vertical members 8 and the connecting horizontal members 7 with clamps 70. Vertical reinforcing pipes 17 are placed at appropriate locations between the suspension frames 5, and the vertical reinforcing pipes 17 and the connecting horizontal members 7 are joined by clamps 70.

[0026] The scaffolding boards 6 are aluminum alloy plates, and multiple boards are arranged side by side in the width direction on the middle horizontal members 11 and the lower horizontal members 12, and are erected between adjacent suspension frames 5. On the outside of the protruding portion 4, no scaffolding board 6 is laid on the lower horizontal member 12.

[0027] On the outside of the protruding portion 4 of the railing 2, a scaffolding board 6' for removing fallen objects is installed on the lower horizontal member 12, making it easier to remove fallen objects. The inner end of the scaffolding board 6' for removing fallen objects is set back further outward than the inner ends of the other scaffolding boards 6 so as not to interfere with the protruding portion 4 that extends outward from the railing 2.

[0028] As shown in Figures 4 to 6, the scaffolding board 6' for removing fallen objects is formed by attaching a non-slip plate material 61 to the upper surface of a rectangular frame 60. Outer frames 62 are positioned along the width direction at both ends of the rectangular frame 60. Flanges 620 protrude from the lower surface of the outer frames 62 toward both sides in the longitudinal direction of the scaffolding board 6. By fixing the flanges 620 of the outer frames 62 on both sides to the upper surfaces of the scaffolding boards 6 positioned on both sides of the protruding portion 4 with screws or the like, the scaffolding board 6' for removing fallen objects is erected between the scaffolding boards 6. A ring bolt 63 is attached to the upper front end of the outer frame 62.

[0029] The scaffolding board 6' for removing fallen objects is divided into an inner opening / closing cover 64 and an outer walkable section 65, with the outer edge of the opening / closing cover 64 connected to the inner edge of the walkable section 65 via a hinge 66. Walkable sections 65 are fixed to the outer parts of opposing flanges 620 of the outer frame 62 which are spaced apart, and opening / closing covers 64 are placed on the inner parts. A scaffolding board 6' for removing fallen objects is installed between the scaffolding boards 6 on both sides of the protruding section 4.

[0030] Since the opening / closing cover 64 is simply resting on the flange 620 of the outer frame 62, it can be opened and closed by rotating it around its outer edge as an axis. When the opening / closing cover 64 is rotated upward, an outlet 67 is formed on the scaffolding board 6' for discharging fallen objects, and when the opening / closing cover 64 is rotated downward and placed on the flange 620, the outlet 67 is closed. Fasteners 68 that can engage with each other are provided on the front end surface of the outer frame 62 and on the front ends of both longitudinal sides of the opening / closing lid 64. When the fasteners 68 are engaged, the rotation of the opening / closing lid 64 is restricted.

[0031] The walkable section 65 is configured to be non-openable or closable. Furthermore, on the outer frame 62, an inclined plate 69 is installed on the flange 620 on the side opposite to the opening / closing lid 64 and the walkable section 65, which is sloped so as to gradually rise towards the scaffolding board 6' for removing fallen objects, and the upper surface of the scaffolding board 6' for removing fallen objects is smoothly continuous with the upper surface of the other scaffolding boards 6.

[0032] The protruding portion 4 of the railing 2 is molded independently of the main body of the railing 2 and is therefore easily separated, sometimes requiring replacement with a metal plate covering or repair. During such work, a part of the protruding portion 4 is prone to peeling off and falling onto the debris removal scaffolding board 6'. However, by placing a transport vehicle smaller than a crane under the debris removal scaffolding board 6', removing the fastener 68, and rotating the opening / closing cover 64 upwards to open the discharge port 67, the fallen objects can be easily removed by dropping them downwards through the discharge port 67. Of course, if there are no people or objects below the debris removal scaffolding board 6', the debris that has fallen onto the debris removal scaffolding board 6' can be dropped directly to the ground through the discharge port 67.

[0033] [Second Embodiment] Figures 7 and 8 show a second embodiment. In the second embodiment, detailed descriptions of parts similar to those in the first embodiment will be omitted, and the main differences will be described.

[0034] In the second embodiment, the pair of suspension frames 5a positioned outside the protrusion 4 do not include an upper horizontal member and a middle horizontal member, and the vertical member 8a is divisible into an upper vertical member 80 and a lower vertical member 81. Furthermore, the other suspension frames 5 have an upper horizontal member (not shown), but do not have a middle horizontal member. A projection 82 is provided on the upper end surface of the lower vertical member 81. The upper vertical member 80 and the lower vertical member 81 are connected by inserting the projection 82 into the upper vertical member 80 from the lower end surface and fastening a bolt 83 through the upper vertical member 80 and the projection 82.

[0035] A lower horizontal member 12, similar to that in the first embodiment, is fixed to the lower end of the lower vertical member 81, and a scaffolding board 6' for discharging fallen objects is erected on the lower horizontal member 12 of the pair of suspension frames 5a. Since the vertical member 8a, which does not have an upper horizontal member, cannot engage with the railing 2, the upper vertical member 80 and the lower vertical member 81 of the vertical member 8a are connected to the vertical members 8 of other suspension frames 5 that are engaged with the railing 2 by connecting horizontal members 7, and are also connected to each other.

[0036] In this embodiment, the upper vertical member 80 and the lower vertical member 81 are connected, but they can also be fixed by fixing the lower vertical member 81 to the connecting horizontal member 7 or the like without connecting them.

[0037] [Third Embodiment] Figure 9 shows a third embodiment of the present invention. In the third embodiment, unlike the second embodiment, the central horizontal member 11 is provided on the vertical members 8, 8b of the suspension frame 5 and a pair of suspension frames 5b that are located outside the protruding portion 4. The intermediate horizontal member 11 is provided on the upper vertical member 80 of the vertical member 8b, scaffolding boards 6 are erected on the intermediate horizontal members 11 of the multiple suspension frames 5, and scaffolding boards 6' for removing fallen objects are erected on the intermediate horizontal members 11 of the suspension frame 5b.

[0038] The scaffolding board 6' for removing fallen objects, which is installed on the central horizontal member 11, has a similar structure to the scaffolding board 6' for removing fallen objects, which is installed on the lower horizontal member 12. However, since the central horizontal member 11 is shorter than the lower horizontal member 12, it is formed to be slightly narrower. Therefore, it may not have a walkable section 65, or even if it does have a walkable section 65, it may be too narrow to actually walk on. Since the other structures are the same as in the second embodiment, the same reference numerals are used for common parts, and detailed descriptions are omitted.

[0039] [Fourth Embodiment] Figures 10 to 12 show a fourth embodiment of the present invention. In the fourth embodiment, a pair of suspension frames 5c installed on the outside of the protrusion 4 have short vertical members 8c that are suspended from the lower outside of the railing 2. The lower horizontal member 12c, located at the lower end of the vertical member 8c, is supported from below by a stay 123, and an inner positioning plate 124 is attached to its inner end face. Additionally, scaffolding board receiving flanges 125 and 125' protrude from both sides of the lower horizontal member 12c. Other suspension frames 5 have the same structure as the suspension frame 5 in the first embodiment.

[0040] A pair of suspension frames 5c are positioned spaced apart on the outside of the protruding portion 4, with their vertical members 8c fixed to the connecting horizontal members 7 by clamps 70, and connected to the vertical members 8 of adjacent suspension frames 5 by the connecting horizontal members 7, and also connected to each other. A scaffolding board 6 is erected on the upper surface of the lower horizontal member 12 of the suspension frame 5. The end of the scaffolding board 6 located inside the front end of the lower horizontal member 12c extends to the upper surface of the lower horizontal member 12 of the suspension frame 5 located next to the suspension frame 50 and is fixed there. The outer end of the scaffolding board 6 reaches the scaffolding board receiving flange 125 on the suspension frame 5 side of the lower horizontal member 12c of the suspension frame 5c and is fixed there.

[0041] Between a pair of suspension frames 5c, a scaffolding board 6' for discharging fallen objects is erected on the opposing scaffolding board receiving flanges 125'. The walkable portion 65 of the scaffolding board 6' for discharging falling objects is fixed to the outer end of the scaffolding board receiving flange 125' in a way that prevents it from being opened or closed, and the opening / closing cover 64 is placed on the inside of the scaffolding board receiving flange 125' in a way that allows it to be opened or closed. When the opening / closing cover 64 is rotated upward, the discharge port 67 of the scaffolding board 6' for discharging falling objects is opened. Ring bolts 63 are attached to both ends of the inner upper surface of the opening / closing lid 64. The rest of the structure is the same as in the second embodiment. [Explanation of Symbols]

[0042] 1 viaduct 2 railing 3. Suspended scaffolding 4 Protrusion 5 Hanging frame 6 scaffolding planks 6' Scaffolding board for removing fallen objects 60 Rectangular Frames 61 Anti-slip board material 62 Outer frame 620 flange 63 Ring bolts 64 Opening and closing lid 65 Walkable area 66 Hinge 67 Outlet 68 Fasteners 69 Inclined plate 7 Connecting cross member 8 Vertical members 80 Upper vertical member 81 Lower vertical member 82 Protrusion 83 volts 9 Lateral member 10 Upper horizontal member 11. Intermediate transverse member 110 Stay 111 Anti-slip protrusion 12 Lower horizontal member 120 Brace 121 Triangular plate 122 Rising member 123 Stay 124 Inner positioning plate 125,125' Scaffolding board support flange 13 Reinforcement section 130 Front Member 131 Horizontal member 132 Brace 14 hanging piece 15 Engaging part 16 Adjustment Member 17 Vertical reinforcing pipes P utility pole

Claims

1. Including multiple suspension frames and scaffolding planks, Each of the aforementioned suspension frames comprises a vertical member that can be suspended from the outside of the railing of the structure, and a horizontal member that extends from the vertical member toward the railing. A suspended scaffold in which the scaffolding boards are erected between the horizontal members, At least some of the multiple scaffolding boards are scaffolding boards for discharging falling objects, having an openable and closable discharge port. A suspended scaffold characterized by the following features.

2. The inner side of the scaffolding board for discharging fallen objects, which is on the side facing the structure, is an opening / closing lid, and the discharge port is opened and closed when the opening / closing lid rotates on its outer edge, which is on the opposite side from the structure. The suspended scaffolding according to feature 1.

3. A non-opening / closing walkable section is provided on the outside of the aforementioned discharge port. The suspended scaffolding according to feature 2.

4. The inner end of the aforementioned scaffolding board for removing falling objects is set back further outward than the inner ends of other scaffolding boards. The suspended scaffolding according to feature 2.

5. The aforementioned horizontal member includes a middle horizontal member provided in the upper and lower middle portion of the vertical member, and a lower horizontal member provided at the lower end of the vertical member. Scaffolding boards are erected on the middle horizontal member and the lower horizontal member, respectively, and a portion of the scaffolding board erected on the lower horizontal member is the scaffolding board for removing falling objects. A suspended scaffold according to any one of claims 1 to 4.

6. A portion of the scaffolding board erected on the aforementioned intermediate horizontal member is the scaffolding board for removing fallen objects. The suspended scaffolding according to feature 5.

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