Handrail units, scaffolding units, scaffolding devices and scaffolding systems

Abstract

To achieve improved safety and operational efficiency. [Solution] The handrail unit of the present invention comprises a fixed support column, a movable support column, and a handrail having a folding mechanism, wherein one longitudinal end of the handrail is connected to the fixed support column, and the other longitudinal end of the handrail is connected to the movable support column, and the handrail is configured to be extended or folded as the movable support column moves. The scaffolding unit of the present invention comprises a fixed support column, a movable support column, a handrail having a folding mechanism, and a work platform having a folding mechanism, wherein one longitudinal end of the handrail is connected to the fixed support column, and the other longitudinal end of the handrail is connected to the movable support column, and the handrail and work platform are configured to be extended or folded as the movable support column moves. The scaffolding device and scaffolding system of the present invention comprises the handrail unit and scaffolding unit of the present invention.

Description

[Technical Field]

[0001] The present invention relates to a handrail unit, a scaffold unit, a scaffold device and a scaffold system used for work on structures. [Background Art]

[0002] A splice plate is fixed to the main girder of a bridge for the purpose of reinforcement and connection between members. Conventionally, as a scaffold that can be used for splicing work, a joint scaffold provided across the joint ends of girders such as bridges is known (Patent Document 1).

[0003] The joint scaffold includes a floor plate portion and side frame portions that suspend and support both side ends of the floor plate portion, and the floor plate portion is configured to be foldable, thereby facilitating assembly work, removal and repositioning work on site. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent No. 2809612 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] However, in the joint scaffold described in Patent Document 1, since the handrail is of a detachable type, the handrail installation position becomes an opening until the handrail is installed, and work at the opening position is required, so there is room for improvement in terms of safety. In addition, when the handrail is detachable, there are still risks such as requiring a lot of labor and time for on-site assembly and dismantling work, forgetting to bring the handrail, losing it during storage, and forgetting to install it on site, leaving problems in terms of operation.

[0006] This invention has been made in view of the above circumstances, and its objective is to provide a handrail unit, scaffolding unit, scaffolding device, and scaffolding system that can overcome the aforementioned problems of the prior art. [Means for solving the problem]

[0007] [Handrail unit] The handrail unit of the present invention comprises a fixed support column, a movable support column, and a handrail having a folding mechanism, wherein one longitudinal end of the handrail is connected to the fixed support column, and the other longitudinal end of the handrail is connected to the movable support column, and the handrail is configured to be extended or folded as the movable support column moves.

[0008] [Scaffolding Unit] The scaffolding unit of the present invention comprises a fixed support column, a movable support column, a handrail with a folding mechanism, and a work platform with a folding mechanism. One longitudinal end of the handrail is connected to the fixed support column, the other longitudinal end of the handrail is connected to the movable support column, one longitudinal end of the work platform is connected to the fixed support column, and the other longitudinal end of the work platform is connected to the movable support column. The handrail and work platform are configured to be extended or folded as the movable support column moves.

[0009] [Scaffolding equipment] The scaffolding device of the present invention comprises a fixed lifting device and a movable lifting device, with the handrail unit and the scaffolding unit provided between the fixed lifting device and the movable lifting device.

[0010] [Scaffolding System] The scaffolding system of the present invention comprises a first scaffolding device positioned on one side of a structure, a second scaffolding device positioned on the other side of the structure, and a connecting member connecting the first scaffolding device and the second scaffolding device, wherein the scaffolding device of the present invention is used as the first scaffolding device and / or the second scaffolding device. [Effects of the Invention]

[0011] In the handrail unit, scaffolding unit, and scaffolding device and scaffolding system of the present invention, the handrail is connected to fixed and movable support columns. When the unit is deployed, the handrail is deployed in the opening of the handrail unit, and the handrail and floor slab are deployed in the opening of the scaffolding unit, scaffolding device, and scaffolding system. This reduces the amount of work required at the opening and solves safety issues. Furthermore, because the handrail is connected to fixed and movable support columns, assembly and disassembly work at the site is not time-consuming, and there is no need to worry about forgetting to bring the handrail, losing it during storage, or forgetting to install it, thus solving operational issues. [Brief explanation of the drawing]

[0012] [Figure 1] A perspective view showing an example of a scaffolding system. [Figure 2] (a) is a perspective view showing an example of a handrail unit in an unfolded state, and (b) is a perspective view showing an example of a handrail unit in a folded state. [Figure 3] (a) is a perspective view showing an example of a scaffolding unit in an unfolded state, and (b) is a perspective view showing an example of a scaffolding unit in a folded state. [Figure 4] (a) is a plan view showing an example of a work platform, (b) is a side view of the work platform in (a), (c) is a plan view showing an example of a second handrail, and (d) is a side view of the second handrail in (c). [Figure 5] (a) to (c) are diagrams illustrating the deployment procedure of the scaffolding device. [Figure 6] (a) is a side view of the scaffolding system before the girder is erected, (b) is a cross-sectional view showing sections AA and BB of (a) separated into left and right sides, and (c) is a plan view of (a). [Figure 7] (a) is a side view of the scaffolding system during girder erection, (b) is a cross-sectional view showing sections AA and BB of (a) separated into left and right sides, and (c) is a plan view of (a). [Figure 8] (a) is a side view of the scaffolding system when deployed, (b) is a cross-sectional view showing sections AA and BB of (a) separated into left and right, and (c) is a plan view of (a). [Figure 9](a) is a side view of the scaffolding system when fixed, (b) is a cross-sectional view showing the A-A section and B-B section of (a) divided into left and right parts, and (c) is a plan view of (a). [Figure 10] (a) is a side view of the scaffolding system when the lower scaffolding board is arranged, (b) is a cross-sectional view showing the A-A section and B-B section of (a) divided into left and right parts, and (c) is a plan view of (a). [Figure 11] (a) and (b) are explanatory views of the use procedure of the scaffolding system when casters are used as moving bodies. MODE FOR CARRYING OUT THE INVENTION

[0013] (Embodiment) An example of an embodiment of the handrail unit, scaffolding unit, scaffolding device and scaffolding system of the present application will be described with reference to the drawings. For convenience of explanation, the following description will be given with the longitudinal direction of the steel girder X defined as front-rear, the direction orthogonal thereto (width direction) defined as left-right, and the height direction of the steel girder X defined as up-down.

[0014] The scaffolding system of the present application is a scaffolding system that is suitably used mainly when fixing a splice plate Y to a steel girder X. As an example, the scaffolding system shown in Fig. 1 includes two scaffolding devices 100 and a connecting member 200 that connects the two scaffolding devices 100. The two scaffolding devices 100 are arranged on both outer sides with the steel girder X interposed therebetween, and are connected by the connecting member 200.

[0015] The scaffolding device 100 includes a fixed-side lifting tool 110, a movable-side lifting tool 120, a handrail unit 130, and a scaffolding unit 140. The handrail unit 130 and the scaffolding unit 140 are provided between the fixed-side lifting tool 110 and the movable-side lifting tool 120.

[0016] In the present embodiment, one stage of the handrail unit 130 is provided at the uppermost stage, and two stages of the scaffolding units 140 are provided below the handrail unit 130 at intervals in the vertical direction. The number of the scaffolding units 140 may be one, or three or more, depending on the height of the steel girder X.

[0017] The fixed-side lifting device 110 and the movable-side lifting device 120 are components primarily used by workers to move the scaffolding system vertically, and can be made up of, for example, a ladder.

[0018] The fixed-side lifting device 110 and the movable-side lifting device 120 are set to a height that allows for the installation of at least one handrail unit 130 and one or more scaffolding units 140, and to a height that, when installed on the steel girder X, protrudes above and below the steel girder X.

[0019] The handrail unit 130 is primarily a member that workers grip when moving along the upper flange X1 of the steel girder X. As shown in Figures 2(a) and 2(b), the handrail unit 130 of this embodiment includes a handrail with a folding mechanism (hereinafter referred to as the "first handrail") 131, a fixed support column (hereinafter referred to as the "first fixed support column") 132, and a movable support column (hereinafter referred to as the "first movable support column") 133.

[0020] The first handrail 131 functions as a grip for a worker to hold while working on the upper flange X1, and also functions as a lifeline for securing a lanyard connected to a harness worn by the worker.

[0021] The handrail unit 130 of this embodiment is provided with two first handrails 131. The two first handrails 131 are provided with a gap between them vertically. The first handrails 131 are provided only on the side away from the steel girder X, and not on the side close to the steel girder X.

[0022] The two first handrails 131 have the same structure and are equipped with two divided handrails (hereinafter referred to as "first divided handrails") 131a and 131b, and a handrail connector (hereinafter referred to as "first handrail connector") 131c that connects the two first divided handrails 131a and 131b. The first handrail connector 131c functions as a folding mechanism for the first handrails 131.

[0023] The first handrail 131 is configured to be extended or folded by the first handrail connector 131c. The first handrail 131 is designed to be folded only upwards and not downwards.

[0024] The first fixed support column 132 is a member that connects one end of each first handrail 131, and the first movable support column 133 is a member that connects the other end of each first handrail 131.

[0025] The first fixed support 132 and the first movable support 133 are installed perpendicular or approximately perpendicular to the first handrail 131 in its extended state. The first fixed support 132 is installed on the longitudinal rear (front) side of the steel girder X, and the first movable support 133 is installed on the longitudinal front side of the steel girder X. The first fixed support 132 and the first movable support 133 can be constructed from single pipes or the like.

[0026] One end of the first handrail 131 is connected to the first fixed support 132, and the other end of the first handrail 131 is connected to the first movable support 133. Existing clamps can be used for the connection.

[0027] The two first handrail connectors 131c, located on the same vertical line, are connected by a vertically elongated vertical connecting member (hereinafter referred to as the "first vertical connecting member") 134. The two first handrails 131, connected by the first vertical connecting member 134, are folded or unfolded in conjunction with each other.

[0028] The scaffolding unit 140 is a component used by workers as scaffolding during work. As shown in Figures 3(a) and 3(b), the scaffolding unit 140 of this embodiment includes a work platform 141 with a folding mechanism, a handrail (hereinafter referred to as the "second handrail") 142 with a folding mechanism, a fixed support column (hereinafter referred to as the "second fixed support column") 143, and a movable support column (hereinafter referred to as the "second movable support column") 144.

[0029] The work platform 141 comprises two divided floors 141a and 141b, and a floor connector 141c that connects the two divided floors 141a and 141b. The floor connector 141c functions as a folding mechanism for the work platform 141.

[0030] As shown in Figures 4(a) and 4(b), the two divided floors 141a and 141b are constructed with a flooring material made of expanded metal or the like, mounted on a generally rectangular frame. One of the divided floors, 141a, is provided with an opening (hatch) 141d for workers to enter and exit.

[0031] A cover 141e for opening and closing the hatch 141d is provided around its periphery. The cover 141e consists of a generally rectangular frame with a floor material made of expanded metal or the like. When closed, the cover 141e functions as a work platform 141.

[0032] In this embodiment, the opening / closing cover 141e has a rectangular cutout at one of its four corners, and the cutout is open. This opening 141f is configured to be used as an opening for installing a safety block.

[0033] The two divided floors 141a and 141b are configured to fold upward by the floor connector 141c. The two divided floors 141a and 141b do not fold downward, and the lowest position is when the two divided floors 141a and 141b are horizontal.

[0034] The second handrail 142 functions not only as a grip for workers to hold onto while working on the work platform 141, but also as a lifeline for securing a lanyard connected to a harness worn by the worker.

[0035] The scaffolding unit 140 of this embodiment is provided with two second handrails 142. As shown in Figures 3(a)(b) and 4(c)(d), the two second handrails 142 are provided with a gap between them vertically. The second handrails 142 are provided only on the side away from the steel girder X, and not on the side close to the steel girder X.

[0036] The two second handrails 142 have the same structure and are equipped with two divided handrails (hereinafter referred to as "second divided handrails") 142a and 142b, and a handrail connector (hereinafter referred to as "second handrail connector") 142c that connects the two second divided handrails 142a and 142b. The second handrail connector 142c functions as a folding mechanism for the second handrails 142.

[0037] The second handrail 142 is configured to be extended or folded by the second handrail connector 142c. Similar to the work platform 141, the second handrail 142 is designed to be folded only upwards and not downwards.

[0038] The second fixed support column 143 is a member that connects one end of the work platform 141 to one end of each second handrail 142, and the second movable support column 144 is a member that connects the other end of the work platform 141 to the other end of each handrail.

[0039] The second fixed support 143 and the second movable support 144 are installed perpendicular or nearly perpendicular to the working platform 141 and the second handrail 142, which are in their deployed state. The second fixed support 143 is installed on the longitudinal rear (front) side of the steel girder X, and the second movable support 144 is installed on the longitudinal front side of the steel girder X. The second fixed support 143 and the second movable support 144 can be constructed from single pipes or the like.

[0040] The second fixed support column 143 is connected to one end of the work platform 141 and the two second handrails 142, and the second movable support column 144 is connected to the other end of the work platform 141 and the two second handrails 142. Existing clamps can be used for the connections.

[0041] The floor connector 141c and both second handrail connectors 142c, located on the same vertical line, are connected by a vertically elongated vertical connecting member (hereinafter referred to as the "second vertical connecting member") 145. The floor connector 141c and the two second handrail connectors 142c, connected by the second vertical connecting member 145, fold or unfold in conjunction.

[0042] As shown in Figure 1, in this embodiment, two scaffolding devices 100 configured as described above are placed one on each side of the steel girder X (a total of two), and are connected by a connecting member 200. Since both scaffolding devices 100 are installed so as to be symmetrical with respect to a reference line parallel to the longitudinal direction of the steel girder X, the positions of the second handrail 142 and the first handrail 131 are reversed left and right.

[0043] In this embodiment, the connecting members 200 that connect the two scaffolding devices 100 are an upper connecting member 200a positioned to straddle the upper side of the upper flange X1 of the steel girder X, and a lower connecting member 200b positioned to pass under the lower side of the lower flange X2 of the steel girder X. Two of each of the upper connecting member 200a and the lower connecting member 200b are provided.

[0044] The rear upper connecting members 200a and lower connecting members 200b are fixed to the fixed lifting device 110, while the front upper connecting members 200a and lower connecting members 200b are fixed to the movable lifting device 120. Additionally, the two upper connecting members 200a are fixed to the upper flange X1, and the two lower connecting members 200b are fixed to the lower flange X2. Existing clamps and the like can be used for fixing.

[0045] (operation) Next, the operation of the scaffolding system of this embodiment will be described. As shown in Figures 5(a) to (c), in the scaffolding system of this embodiment, when the movable lifting device 120 moves toward the longitudinal front of the steel girder X from a folded state, the first movable support column 133 and the second movable support column 144 connected to the movable lifting device 120 move in the same direction as it moves, and when the movable lifting device 120 moves to the furthest forward position, the handrail unit 130 and the scaffolding unit 140 are in an open state (unfolded state).

[0046] On the other hand, when the movable lifting device 120 of the deployed scaffolding device 100 is moved toward the fixed lifting device 110, the first movable support column 133 and the second movable support column 144 connected to the movable lifting device 120 move in the same direction as it moves, and when the movable lifting device 120 moves to the rearmost position, the handrail unit 130 and the scaffolding unit 140 are folded (folded state).

[0047] Although Figures 5(a) to 5(c) show only one scaffolding device (first scaffolding device) 100, the other scaffolding device (second scaffolding device) 100, connected via the connecting member 200, also operates in conjunction with the illustrated scaffolding device 100.

[0048] (Instructions for use) Next, an example of the procedure for using the scaffolding system of this embodiment will be explained with reference to Figures 6(a) to 6(c) to 10(a) to 10(c) (references not shown in these drawings will be shown in other drawings). Here, we will consider an example in which a guide 300 (here, a linear guide that is straight along the longitudinal direction of the steel girder X) is used when deploying and folding the scaffolding system.

[0049] Figures 6(a) to 6(c) show the handrail unit 130 and scaffolding unit 140 in the folded state. In this state, the first fixed support 132 and the first movable support 133 are close together, and the second fixed support 143 and the second movable support 144 are close together, and the first handrail 131, as well as the work platform 141 and the second handrail 142 connected to them are folded. The scaffolding system can be set up in advance on the ground near the attachment point of the steel girder X.

[0050] After the scaffolding system is installed, guides 300 are installed along the longitudinal direction of the upper flange X1 of the steel girder X, as shown in Figures 7(a) to (c). One row of guides 300 is installed on each side of the upper flange X1 (a total of two rows). Single pipes or other straight members can be used for the guides 300.

[0051] After installing the guide 300, as shown in Figures 8(a) to (c), when the upper connecting member 200a connected to the movable lifting device 120 is moved forward along the guide 300, the movable lifting device 120 and the first movable support column 133 and the second movable support column 144 connected to it move in the same direction, and the first handrail 131, as well as the work platform 141 and the second handrail 142 connected to them, are deployed.

[0052] After the first handrail 131 of the handrail unit 130 and the work platform 141 and second handrail 142 of the scaffolding unit 140 are fully extended, the movable lifting device 120 is fixed to the guide 300 as shown in Figures 9(a) to (c). Two anti-sway clamps 310 (four in total) are fixed to the front and rear sides of the lower flange X2, and these anti-sway clamps 310 are used to hold the two lower connecting members 200b. The front lower connecting member 200b is fixed to the second movable support column 144 of the lower scaffolding unit 140 of both scaffolding devices 100, and the rear lower connecting member 200b is fixed to the second fixed support column 143 of the lower scaffolding unit 140 of both scaffolding devices 100.

[0053] After the aforementioned fixing work is completed, the lower scaffolding board 210 is installed so as to straddle the work platform 141 of the lower scaffolding unit 140 of both scaffolding devices 100, as shown in Figures 10(a) to (c), and the deployment work is completed. Workers can then use the deployed scaffolding system to perform splicing work.

[0054] To fold the scaffolding system from its deployed state, simply reverse the operation used during deployment. Specifically, by removing the lower scaffolding board 210, detaching the lower connecting member 200b, and then moving the movable lifting device 120 toward the fixed lifting device 110, the scaffolding unit 140 and the handrail unit 130 can be folded.

[0055] In the above-described procedure, the upper connecting member 200a is moved along the guide 300 as an example. However, as shown in Figures 11(a) and 11(b), casters 150 can be attached to the movable lifting device 120, and the casters 150 can be moved along the guide 300. In this case, the guide 300 can be designed to facilitate the movement of the casters 150.

[0056] In the truck crane bent erection method, which is common in bridge construction, steel girders are partially assembled on the ground, then the girders are placed on temporary supports (bents) using a crane, and then the girders are joined in mid-air to other steel girders assembled on the ground. As a result, workers have to work at high altitudes in an unstable environment, which presents a problem in ensuring the safety of the workers.

[0057] In contrast, the technology disclosed in this application makes it possible to reduce or eliminate the need for the above-mentioned aerial splicing work, thereby reducing the work that is dangerous for workers and improving safety during construction.

[0058] Furthermore, when assembling steel girders on the ground, if the scaffolding system of the present invention is installed near the splice position of the steel girder, and the scaffolding system is installed at the actual erection position using a crane together with the steel girder, then when installing the other steel girder, the scaffolding system can be deployed from the side of the steel girder that was installed first, thereby securing a working platform and enabling safe and efficient splice work.

[0059] This embodiment is an example, and the handrail unit, scaffolding unit, scaffolding device, and scaffolding system of the present invention are not limited to the configuration of this embodiment. Each component of this embodiment can be modified, such as by replacing, omitting, or adding, to the extent that the intended purpose can be achieved.

[0060] For example, in this embodiment, the scaffolding device 100 is shown as having two scaffolding units 140 and one handrail unit 130, but the number of scaffolding units 140 and handrail units 130 in the scaffolding device 100 may be other than this.

[0061] Furthermore, although not specifically mentioned in this embodiment, the scaffolding device 100 may also be provided with a locking ring or the like to secure the crane when deploying or folding the scaffolding system. In this case, the deployment and folding of both scaffolding devices 100 can be performed in conjunction with the raising and lowering of the crane.

[0062] This embodiment and its modifications are merely examples and do not constitute a basis for restricting the technical scope of the present invention. The technical scope of the present invention is defined based on the claims. Furthermore, the technical scope of the present invention includes equivalents to the claims. [Industrial applicability]

[0063] The handrail unit, scaffolding unit, scaffolding device, and scaffolding system of the present invention can be suitably used as a scaffolding system when carrying out construction work on various structures, in particular when installing splice plates Y on steel girders X. [Explanation of Symbols]

[0064] 100 Scaffolding equipment 110 Fixed-side lifting device 120 Movable side lifting device 130 Handrail Unit 131 Handrail (First Handrail) 131a Divided handrail (first divided handrail) 131b Divided handrail (first divided handrail) 131c Handrail connector (First handrail connector) 132 Fixed pillar (first fixed pillar) 133 Movable strut (first movable strut) 134 Vertical connecting member (first vertical connecting member) 140 scaffolding units 141 Work platform 141a split floor 141b Split floor 141c Floor connector 141d Hatch 141e Opening / Closing Lid 141f aperture 142 Handrail (Second Handrail) 142a Divided handrail (second divided handrail) 142b Divided handrail (second divided handrail) 142c Handrail connector (Second handrail connector) 143 Fixed column (second fixed column) 144 Movable strut (second movable strut) 145 Vertical connecting member (second vertical connecting member) 150 casters 200 Connecting Member 200a Upper connection material 200b Lower connecting material 210 Lower scaffolding board 300 Guide 310 Anti-vibration clamp X Steel girder X1 Upper flange X2 Lower flange Y attachment plate

Claims

1. The first scaffolding device is positioned on one side of the existing steel girder, A second scaffolding device is positioned on the other side of the aforementioned existing steel girder, A connecting member that connects the first scaffolding device and the second scaffolding device, The system includes a guide that spans both the existing steel girder and the erected steel girder connected to the existing steel girder, Each of the first and second scaffolding devices comprises a fixed-side lifting device, a movable-side lifting device, and a handrail unit and scaffolding unit positioned between the fixed-side lifting device and the movable-side lifting device. The handrail unit comprises a first fixed support, a first movable support, and a first handrail having a folding mechanism. One end of the first handrail in the longitudinal direction is connected to the first fixed support column. The other end of the first handrail in the longitudinal direction is connected to the first movable support column. The first handrail is configured to unfold or fold in accordance with the movement of the first movable support column. The scaffolding unit comprises a second fixed support column, a second movable support column, a second handrail with a folding mechanism, and a work platform with a folding mechanism. One end of the second handrail in the longitudinal direction is connected to the second fixed support column. The other end of the second handrail in the longitudinal direction is connected to the second movable support column. One end of the work platform in the longitudinal direction is connected to the second fixed support column. The other end of the work platform in the longitudinal direction is connected to the second movable support column. The second handrail and work platform are configured to unfold or fold in conjunction with the movement of the second movable support column. The handrail unit and scaffolding unit are configured to unfold or fold in accordance with the movement of the movable lifting device. The connecting member is connected to the movable lifting device, The movable lifting device is configured to move from the side of the existing steel girder to the side of the erected steel girder as the connecting member moves along the guide from the existing steel girder to the erected steel girder. The handrail unit and scaffolding unit are configured to be deployed to the lateral positions of both the existing steel girder and the erected steel girder when the movable lifting device is moved onto the erected steel girder. Scaffolding system.

2. Casters are provided on the movable lifting device. Instead of moving the connecting member along the guide, the caster is configured to move along the guide. The scaffolding system according to claim 1.

3. The guides are provided in two rows, spaced apart in the width direction of the upper flange of the steel girder. The scaffolding system according to claim 1 or claim 2.

4. The scaffolding system described in claim 1 is installed near the splice position of the existing steel girder. After the scaffolding system is installed, the temporary steel girder to be connected to the existing steel girder is positioned near the joint end of the existing steel girder. A guide is installed at a position that spans both the existing steel girder and the erected steel girder. By moving the connecting member of the scaffolding system along the guide from the existing steel girder to the erected steel girder, the handrail unit and the scaffolding unit are deployed to the lateral positions of both the existing steel girder and the erected steel girder. Scaffolding installation method.

5. Instead of moving the connecting members of the scaffolding system along the guide, the casters provided on the movable lifting device of the scaffolding system are moved along the guide. The scaffolding installation method according to claim 4.

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