Support frame

Abstract

To eliminate the impossibility of stabling installing a support frame of a gondola unit if vertical or horizontal misalignment occurs on site while a working platform on which the gondola unit is installed should be constructed as designed.SOLUTION: This support frame comprises a first framework part vertically disposed as a framework structure. A first adjustment arm projects in a horizontal direction from the first framework part. The first adjustment arm can be detached from the first framework part, changed in height position along the first framework part, and fixed to the base end of a working platform.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an improvement of a support frame of a gondola unit used for disassembling a working scaffold.

Background Art

[0002] A working scaffold, which is an example of a temporary building, is used as a passageway or a working scaffold for construction provided to transport workers, construction machinery, materials, etc. from the shore, mountain slopes, etc. during the construction of bridges, etc. Since such a working scaffold is temporary, it is disassembled after the construction of bridges, etc. is completed. A gondola unit used for disassembling a working scaffold has been proposed (Patent Document 1). This gondola unit includes a gondola and a support frame for the gondola. The support frame has a skeletal structure formed by assembling steel materials into a box shape, and a slider movable in the axial direction is arranged on the upper beam. The gondola is suspended from this slider via a wire. For prior art documents disclosing the technology related to this invention, refer also to Patent Document 2 and Patent Document 3.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above gondola unit had the following problems. The working platform on which the gondola unit is installed should be constructed as designed, but on-site, misalignment may occur vertically, horizontally, or in both directions. If there is such misalignment, the support frame of the gondola unit cannot be installed stably. When a support frame with a skeletal structure formed by assembling steel materials into a box shape is adopted, its length is limited due to the relationship with the loading platform length of the transport truck. Therefore, when the distance between the base end of the working platform and the tip end to be disassembled is longer than the skeletal structure of the support frame, the support frame cannot be installed. Also, when the height of the tip end is different from that of the base end, if a support frame with a box-shaped skeletal structure is installed between the two with different heights, the support frame will be inclined. With such an inclination, the stability of the support frame is impaired, which is not preferable for high-altitude work. Also, since the support frame is provided with a slider for the gondola, such an inclination may also cause malfunction of the slider.

Means for Solving the Problem

[0005] This invention has been made to solve the above problems, and its first aspect is defined as follows. A support frame for a gondola unit for disassembling a working platform, The support frame includes a first framework portion arranged vertically as a skeletal structure, A first adjustment arm protrudes horizontally from the first framework portion, The first adjustment arm is detachable from the first framework portion and its height position can be changed along the first framework portion, and it can be fixed to the base end of the working platform.

[0006] According to the support frame of the first aspect defined in this way, the first adjustment arm protruding horizontally from the first framework portion can be fixed to the base end of the working platform. Therefore, even when the length of the skeletal structure of the support frame is shorter than the distance between the base end of the working platform and the tip end to be disassembled, by adopting the first adjustment arm to compensate for the insufficient length, it becomes possible to install the support frame between the base end of the working platform and the tip end to be disassembled.

[0007] By adjusting the height of the first adjustment arm protruding horizontally and fixing it to the base end of the workbench, even if there is a difference in height between the base end and the tip end to be disassembled, the height can be absorbed and the support frame can be installed horizontally, that is, without tilting. A second adjustment arm is also provided on the second framework portion of the support frame facing the tip end of the workbench to be disassembled. By adjusting the heights of the first adjustment arm and the second adjustment arm, tilting of the support frame can also be prevented.

[0008] The first adjustment arm is fixed to the base end of the workbench. This is to stabilize the support frame. The portion supported at the tip end in the support frame (the lower beam of the frame structure of the support frame or the second adjustment arm) is not fixed to the tip end, but is simply placed or temporarily fixed so as to be movable along the tip end. A large stress is applied to the workbench during its use, and stress (strain) may accumulate between the frame supporting the tip end and the frame at the base end. When cutting a stress member such as a diagonal member during the disassembly work of the frame at the tip end (including stress members connecting the base end and the tip end), the tip end may shift with respect to the base end due to the accumulated stress. By making the support frame free with respect to the tip end, even if the tip end shifts, the support frame will not be moved along with it. As a result, even if there is such a shift, its influence will not reach the gondola suspended from the support frame, and the gondola will be stabilized.

[0009] The second aspect of this invention is defined as follows. That is, The support frame defined in the first aspect, wherein the skeletal structure includes columns corresponding to the sides of a rectangular parallelepiped. In the skeletal structure, the columns arranged vertically correspond to the first framework portion. A support frame having a so-called box-shaped skeletal structure including columns corresponding to the sides of a rectangular parallelepiped has a simplified skeletal structure and is suitable for assembly and transportation.

[0010] The third aspect of this invention is defined as follows. That is, A support frame defined in the first aspect, wherein the first framework portion includes a pair of vertically arranged columns, The first adjustment arm is disposed on each of the columns and can be independently adjusted in height. According to the support frame of the third aspect defined in this way, even if there is an inclination at the base end portion of the work platform, by adjusting the height of each first adjustment arm of the pair of columns, the influence of the inclination of the base end portion of the work platform can be absorbed, and the horizontality of the support frame can be maintained.

[0011] The fourth aspect of this invention is defined as follows. That is, A support frame defined in the third aspect, wherein a plurality of the first adjustment arms are attached to each of the columns. According to the support frame of the fourth aspect defined in this way, according to the difference in height between the base end portion and the tip end portion of the work platform, any first adjustment arm can be adopted. In other words, it is possible to select a first adjustment arm with a small movement amount for adjusting the height difference. Thereby, the workability of adjusting the height of the first adjustment arm is improved.

[0012] The fifth aspect of this invention is defined as follows. That is, In the support frame defined in the fourth aspect, among the plurality of the first adjustment arms attached to each column, the lower ones are fixed to the base end portion of the work platform. According to the support frame of the fifth aspect defined in this way, when an operator gets into the gondola in the support frame from the base end portion side of the work platform, the first adjustment arm arranged on the upper side can be used as a handrail.

[0013] The sixth aspect of this invention is defined as follows. That is, A gondola unit including the support frame and the gondola defined in any one of claims 1 to 5. As described above, since the support frame is stably attached to the work platform, the dismantling work using such a gondola unit is stabilized.

[0014] The seventh aspect of this invention defines a method for installing the support frame. A method for installing a support frame defined in any one of the first to fifth situations on the work platform, a height adjustment step of adjusting the height of the first adjustment arm with respect to the first framework portion, a step of fixing the height-adjusted first adjustment arm to the base end portion of the work platform, in the support frame, a step of movably installing a second framework portion on the opposite side of the first framework portion to the tip end portion of the work platform, A method for installing a support frame including

[0015] In such an installation method, when the heights are different between the base end portion and the tip end portion, in the height adjustment step, when fixing the first adjustment arm to the base end portion of the work platform and installing the second framework portion to the tip end portion of the work platform, adjusting the height of the first adjustment arm to make the support frame horizontal (eighth situation). For the support frame installed by executing the installation method of the seventh situation, the height of the gondola suspended from the support frame is adjusted to execute the dismantling of the work platform (ninth situation).

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 7

Figure 8

DETAILED DESCRIPTION OF THE INVENTION

[0017] First, with reference to FIGS. 1 to 4, the dismantling work of the work platform 1 will be outlined. In the process shown in FIG. 1, the main girder 2 is removed from the frame 3 at the tip end portion and the frame 5 at the base end portion of the work platform 1 by the crane 10 on the laying board of the work platform 1. After removing the main girder 2, as shown in FIG. 2, the gondola unit 60 is installed on the top of the frame 3 at the tip end portion and the frame 5 at the base end portion. This gondola unit includes a support frame 30 and a pair of gondolas 50.

[0018] FIG. 3 shows the process of suspending the gondola 50 from the support frame 30 and the worker cutting the stress member. The cut stress member is lifted by the crane 10 and arranged on the laying board of the work platform 1. When the cutting work of the stress member is completed, the gondola 50 is lifted and further removed from within the support frame 30, and further, the support frame 30 is removed from the frame 3 at the tip end portion and the frame 5 at the base end portion (see FIG. 4). Further, the frame 3 at the tip end portion is removed using the crane 10. Next, the crane 10 is moved to the right side in the figure, and the processes of FIGS. 1 to 4 are repeated.

[0019] FIG. 5 shows the installation state of the support frame 30 with respect to the frame 3 at the tip end portion and the frame 5 at the base end portion in the processes shown in FIGS. 2 to 3. Reference numeral 4 in the figure indicates the uppermost beam of the frame 3 at the tip end portion, and reference numeral 5 indicates the uppermost beam of the frame 5 at the base end portion. Reference numeral 7 is the laying board.

[0020] The support frame 30 is a box-shaped structure in which H-shaped steel is arranged on the sides of a rectangle as a skeletal structure. The lower beams 31, 31 are placed on the beam 4 of the frame 3 at the tip and the beam 6 of the frame 5 at the base end. The ends on the base end side of the lower beams 31, 31 are fixed to the beam 6 by bolts or the like. The ends on the tip end side of the lower beams 31, 31 are in a state of being placed on the beam 4, and no fixing means such as bolts are attached. The upper beams 32, 32 of the skeletal structure are longer than the lower beams 31, 31 and protrude like eaves from both ends. This part is used for accommodating the power cable and gas cable of the gondola. The upper beams 32, 32 are connected by a cross beam 47.

[0021] The skeletal structure includes a first framework part 41 and a second framework part 42. The first framework part 41 includes a pair of vertical columns 411, 411 facing the base end of the work platform. The second framework part 42 includes a pair of vertical columns 421, 421 on the tip end side of the work platform. The reference numerals 46, 46 are reinforcing vertical columns arranged approximately in the center. To each of the vertical columns 411, 411 of the first framework part 41, a first adjustment arm 43 is detachably and vertically movably attached via an attachment 71. The structure of the attachment 71 is not particularly limited, but in this example, it can be composed of a first substrate obtained by vertically adjusting one end of the first adjustment arm made of etched steel, a second substrate arranged so as to sandwich the vertical column 411, and a bolt connecting the first substrate and the second substrate.

[0022] To the vertical columns 421, 421 of the second framework part 42, second adjustment arms 44, 44 are detachably and vertically movably attached via an attachment 71. To the vertical columns 421, 421 of this second framework part 42, second adjustment arms 441, 442 are also detachably attached via an attachment 71.

[0023] The gondola 50 is suspended by a wire 51, and the upper end of the wire 51 is fastened to a slider 53. The slider 53 bites into the lower flange of the H-shaped steel constituting the upper beam 32 and is movable in its axial direction.

[0024] Figure 6 shows a case where the distance between the frame 3 at the tip and the frame 5 at the base of the workbench is longer than the lower beams 31, 31 of the support frame 30. When the tip and the base are separated like this, a gap L is formed between the components (lower beam 31) of the skeletal structure of the support frame 30 and both frames 3, 5. Therefore, as shown in Figure 6, the first adjustment arms 43, 43 are projected horizontally from the vertical columns 411, 411. By giving the first adjustment arms 43, 43 a sufficient length (1 - 2 m) compared to the expected gap L, the first adjustment arms 43, 43 can be fixed to the frame 5 at the base end. In this example, the first adjustment arms 43, 43 are fixed to the formwork 7, but they can also be fixed to the beam 6.

[0025] The example in Figure 7 is a case where the frame 3 at the tip of the workbench is lower than the frame 5 at the base end. In this example, the first adjustment arm 43 of the first framework part 41 is moved above the vertical column 411 and fixed to the beam 6. On the other hand, the second adjustment arm 44 of the second framework part 42 is moved below the vertical column 421 and placed on the beam 4. In this way, by adjusting the heights of the first adjustment arm 43 and the second adjustment arm 44, the height difference between the frame 5 at the base end and the frame 3 at the tip of the workbench is absorbed, and the support frame 30 can maintain horizontal.

[0026] The example in Figure 8 is a case where the frame 3 at the tip of the workbench is higher than the frame 5 at the base end. In this example, the first adjustment arm 43 of the first framework part 41 is moved below the vertical column 411 and fixed to the beam 6. On the other hand, the second adjustment arm 44 of the second framework part 42 is moved above the vertical column 421 and placed on the beam 4. In this way, by adjusting the heights of the first adjustment arm 43 and the second adjustment arm 44, the height difference between the frame 5 at the base end and the frame 3 at the tip of the workbench is absorbed, and the support frame 30 can maintain horizontal.

[0027] This invention is not limited to the above - described forms and drawings, and any design changes can be made within the scope understandable by those skilled in the art.

Explanation of Reference Numerals

[0028] 1 Working platform 3 Frame at the tip of the working platform 5 Frame at the base end of the working platform 7 Laying board 10 Crane 30 Support frame 41 First framework part 42 Second framework part 43, 43 First adjustment arm 44, 44 Second adjustment arm 50 Gondola 51 Wire 53 Slider 60 Gondola unit 411, 411 Vertical column 421, 421 Vertical column L Gap

Claims

1. A support frame for a gondola unit for disassembling a work platform, wherein the support frame includes a first framework portion arranged vertically as a skeletal structure, a first adjustment arm projects horizontally from the first framework portion, the first adjustment arm is detachable from the first framework portion and its height position can be changed along the first framework portion, and it can be fixed to the base end portion of the work platform. The support frame.

2. The skeletal structure includes columns corresponding to the sides of a rectangular parallelepiped, In the skeletal structure, the column arranged vertically corresponds to the first framework portion. The support frame according to claim 1.

3. The first framework portion includes a pair of columns arranged vertically, The first adjustment arm is arranged on each of the columns and can be adjusted independently in height. The support frame according to claim 1.

4. A plurality of the first adjustment arms are attached to each of the columns. The support frame according to claim 3.

5. Among the plurality of first adjustment arms attached to each column, the lower ones are fixed to the base end portion of the work platform. The support frame according to claim 4.

6. A gondola unit including the support frame according to any one of claims 1 to 5 and a gondola.

7. A method for installing a support frame according to any one of claims 1 to 5 on the work platform, a height adjustment step of adjusting the height of the first adjustment arm with respect to the first framework portion, a step of fixing the height-adjusted first adjustment arm to the base end portion of the work platform, In the support frame, a step of installing the second framework portion on the opposite side of the first framework portion so as to be movable to the tip end portion of the work platform, A method for installing a support frame including.

8. When the heights are different between the base end portion and the tip end portion, in the height adjustment step, when the first adjustment arm is fixed to the base end portion of the work platform and the second framework portion is installed at the tip end portion of the work platform, the height of the first adjustment arm is adjusted to make the support frame horizontal. The method according to claim 7.

9. A method for disassembling a work platform, which cuts a stress member of the work platform by adjusting the height of a gondola suspended from a support frame installed by executing the installation method according to claim 7.

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