High-altitude work platform

Abstract

The present invention provides a high-altitude work platform that, when installed at the bottom of an elevator shaft, can be used in a manner that minimizes the risk of tipping over. [Solution] The elevated work platform 2, which is installed in a building and used at the bottom 12 of an elevator shaft 10, has a main body 4 including a trolley 100, a work platform 200, and a lifting device for raising and lowering the work platform 200 relative to the trolley 100, and is provided with support means 400 to support the trolley 100 so that it does not tilt, on the elevator shaft walls 10A, 10B, 10C, and 10D, which are part of the building and are located to the side of the main body 4 installed at the bottom 12.

Description

Technical Field

[0001] The present invention relates to an aerial work platform, and more particularly to an aerial work platform that can be used for installing equipment in an elevator shaft during elevator installation work.

Background Art

[0002] In the installation work of an elevator with a low lifting stroke, for example, a lifting stroke of about 12 m to 13 m or less, conventionally, when installing equipment in the elevator shaft, a framework scaffold has been installed over the entire height of the elevator shaft (Patent Document 1). Workers move up and down the scaffold and install equipment in the elevator shaft, such as rail brackets and guide rails, from the scaffold.

[0003] The work of moving inside the framework scaffold generally places a heavy burden on workers. Also, the installation of the scaffold and the disassembly (removal) of the scaffold after the completion of the installation work of the equipment in the elevator shaft take time, and the construction period tends to be long.

[0004] Therefore, the inventor of the present application has considered using an aerial work platform (for example, Patent Document 2) used for exterior wall work or the like at a construction site of a low-rise building or a house. The aerial work platform is widely popular and mainly has a cart installed at the work site, a work floor, and a lifting device for lifting the work floor with respect to the cart. In addition, outriggers are provided to prevent the work floor from tipping over when it is lifted high. Needless to say, an outrigger is a device that projects horizontally from the cart and contacts the ground (abuts against the ground) to stabilize the cart and thus the entire aerial work platform.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] The inventor of the present invention conducted research assuming the placement of a high-altitude work platform capable of rising to a height of approximately 13m at the bottom of a pit in an elevator shaft. He found that, within the relatively narrow space of the elevator shaft (bottom of the pit), it was not possible to secure a sufficient outrigger extension to prevent the high-altitude work platform from tipping over.

[0007] In view of the above-mentioned problems, the present invention aims to provide a high-altitude work platform that can be used while being installed at the bottom of an elevator shaft in a manner that prevents tipping as much as possible. [Means for solving the problem]

[0008] To achieve the above objective, the elevated work platform according to the present invention has a main body that includes a trolley, a work platform, and a lifting device for raising and lowering the work platform relative to the trolley, and is used by being installed at the bottom of an elevator shaft installed in a building, and is characterized in that it has a support means that supports the trolley so that it does not tilt, with the main body installed at the bottom being located to the side of a part of the building.

[0009] Furthermore, the support means is characterized by bracing the trolley against a part of the building to support it so that it does not tilt.

[0010] Furthermore, the support means includes a first rod member pair comprising a first rod member and a second rod member projecting horizontally in opposite directions from the trolley, and a second rod member pair comprising a first rod member and a second rod member projecting horizontally in opposite directions from the trolley, wherein the first rod member and the second rod member of the first rod member pair are part of the building located in their respective projecting directions, and their displacement in those projecting directions is constrained, and at least one of the first rod member and the second rod member is a bracing rod, and the first rod member pair creates a couple in a first direction on the trolley. The invention is characterized in that the first and second rod members of the second rod member pair are constrained in their respective protruding directions within a part of the building, and at least one of the first and second rod members is a bracing rod, and the second rod member pair acts as a couple on the trolley in a second direction opposite to the first direction, and the bracing force of the bracing rod of the first rod member pair and the bracing force of the bracing rod of the second rod member pair support the trolley within the part of the building so as not to tilt.

[0011] Furthermore, it is characterized by having a means to prevent the work platform from shaking in at least one direction.

[0012] The anti-swaying means is characterized by being a rod member, one end of which is fixed to the work platform and the other end of which abuts against a part of the building.

[0013] Alternatively, the anti-sway means is characterized by being a rope that connects the work platform to a part of the building within the elevator shaft.

[0014] Alternatively, the anti-sway means is characterized by being a roller guide provided on the work platform and guided by a guide rail already laid in the elevator shaft.

[0015] Furthermore, the work platform is characterized by having a base floor portion fixed to the lifting device and an adjustment floor portion connected to and fixed to the base floor portion to adjust the work area. [Effects of the Invention]

[0016] According to the high-altitude work platform according to the present invention having the above-described configuration, since it is a part of a building existing on the side of the main body placed at the bottom of the lifting path and supports the cart so that it does not tilt, the cart is prevented from tilting regardless of the width of the lifting path (even in a narrow lifting path), and thus, fall prevention is achieved as much as possible.

Brief Description of the Drawings

[0017] [Figure 1] It is a perspective view showing a schematic configuration of a part of the main body of the high-altitude work platform according to the embodiment. [Figure 2] It is a schematic diagram for explaining the operation of the lifting mechanism of the above high-altitude work platform. [Figure 3] It is a perspective view of the state where the work floor of the above high-altitude work platform is at the highest. [Figure 4] It is a perspective view of the state where the support means is attached to the main body of the above high-altitude work platform. [Figure 5] It is a plan view of the state where the above high-altitude work platform is placed at the bottom of the lifting path. [Figure 6] It is a perspective view of the upper part of the above high-altitude work platform. [Figure 7] It is a schematic diagram of the state where the second anti-sway means is provided on the above high-altitude work platform, where (a) shows a plan view of the high-altitude work platform and the landing area, (b) shows a front view thereof, and (c) shows an enlarged view of part A in (b). [Figure 8] It is a diagram for explaining the third anti-sway means together with a part of the installation process of the equipment in the lifting path, where (a) is a plan view of the inside of the lifting path before installing the guide rail, and (b) is the same plan view after installing the guide rail. [Figure 9] It is a perspective view of the state where the support means including the support auxiliary member is attached to the main body of the above high-altitude work platform.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, based on an embodiment, a working platform at a high place according to the present invention will be described while referring to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a part of a main body 4 in a working platform 2 according to the embodiment.

[0019] <Main body> The main body 4 includes a cart 100, a work floor 200, and a lifting device 300 that raises and lowers the work floor 200 with respect to the cart 100. Note that the work floor 200 includes a base floor portion 210 and an adjustment floor portion 220 (FIGS. 6 and 8), but only the base floor portion 210 is shown in FIG. 1.

[0020] The cart 100 has a rectangular cart frame 110. The cart frame 110 has a pair of long frame members 112 and 114 and a pair of short frame members 116 and 118, and these frame members are combined to form an overall rectangular shape.

[0021] A pair of casters 120 and 122 are attached to both end portions of the frame member 112. Similarly, a pair of casters are attached to the frame member 114, but they are not shown in FIG. 1.

[0022] The lifting device 300 raises and lowers the work floor 200 (base floor portion 210) with respect to the cart 100 by a known mast-type lifting mechanism having a hydraulic cylinder as a drive source. The lifting device 300 has a first lifting unit 300A and a second lifting unit 300B. The first lifting unit 300A and the second lifting unit 300B have the same configuration. Therefore, components of the first lifting unit 300A are denoted by the symbol "a", and components corresponding to the components of the first lifting unit 300A in the second lifting unit 300B are denoted by the symbol "b", and the first lifting unit 300A will be described as a representative, and the description of the configuration of the second lifting unit 300B will be omitted.

[0023] Since the lifting mechanism of the first lifting unit 300A is known as described above, it will be briefly described here while referring to the schematic diagram of the lifting mechanism shown in FIG. 2.

[0024] The first lifting unit 300A has a fixed mast 302a. The fixed mast 302a is fixed to a frame 110 (not shown in Figure 2). A drive mast 304a is provided parallel to the fixed mast 302a. Furthermore, multiple driven masts 306a are provided parallel to the drive mast 304a. In this example, there are five driven masts 306a (Figure 3), but only the two closest to the drive mast 304a are shown in Figure 2.

[0025] Guide rollers (not shown) are provided between the fixed mast 302a and the drive mast 304a, between the drive mast 304a and the driven mast 306a, and between adjacent driven masts 306a, allowing adjacent masts to be displaced relative to each other in the vertical direction.

[0026] Adjacent to the drive mast 304a, a hydraulic cylinder 308a is provided to drive the drive mask 304a up and down. The hydraulic cylinder 308a includes a cylinder tube 310a and a piston rod 312a. The upper end of the piston rod 312a is fixed to the upper end of the drive mast 304a via a mounting member. The hydraulic cylinder 308a is driven by an electric hydraulic pump (not shown).

[0027] Rollers 314a and 316a are attached to the upper ends of the drive mast 304a and the driven mast 306a, respectively. Chains 318a and 320a are wrapped around rollers 314a and 316a, respectively. In the configuration shown in Figure 2, the right end of each chain is connected to the upper end of the right mast, and the left end is connected to the lower end of the left mast. For example, the right end of chain 318a is connected to the upper end of the fixed mast 302a, and the left end is connected to the lower end of the driven mast 306a. In this way, the masts are sequentially connected by the chains, with the right end of a chain wrapped around a roller at the upper end of one mast connecting to the upper end of the mast to the right of that mast, and the left end connecting to the lower end of the left mast.

[0028] In the first lifting unit 300A (and the second lifting unit 300B) having the above configuration, when the piston rod 312a of the hydraulic cylinder 308a is raised by the electric hydraulic pump, the drive mast 304a rises along with it. When the drive mast 304 rises, the driven mast 316a is pulled up (risen) by the chain 318a wrapped around the roller 314a. The adjacent driven mast 306a is pulled up (risen) by the chain 320a wrapped around the roller 320a of the rising driven mast 316a... and so on, all the driven masts 306a rise in conjunction with the rise of the drive mast 304a.

[0029] The longer the protrusion length of the piston rod 321a from the cylinder tube 310a of the hydraulic cylinder 308a, the higher the height of each driven mast 306a also becomes (Figure 2(b), Figure 2(c)). Figure 3 shows the state of the elevated work platform 2 when each driven mast 316a is at its highest point, that is, when the work platform 200 (base floor section 210) is at its highest point.

[0030] As shown in Figure 3, the work platform 200 is considerably higher than the size of the trolley 100, so there is a risk of tipping over unless some measures are taken. However, as previously mentioned, conventional outriggers cannot be used inside the elevator shaft. Therefore, a support means 400 was provided to prevent the elevated work platform 2 from tipping over.

[0031] <Support means> The support means 400 is a means of supporting the trolley 100 to the hoistway wall or other part of the building located to the side of the main body 4 which is installed at the bottom of the hoistway, so that the trolley 100 does not tilt. More specifically, the support means 400 is a means of supporting the trolley 100 by bracing it against the part of the building so that the trolley 100 does not tilt. The support means 400 will be described in detail below.

[0032] Figure 4 shows a perspective view of the main body 4 with the support means 400 attached. Figure 5 is a plan view of the elevated work platform 2 when it is placed on the bottom 12 of the elevator shaft 10. The support means 400 consists of a combination of single pipes, which are rod members, and the single pipes are assembled to the trolley 100 (frame 110) using single pipe clamps. The single pipes (hereinafter simply referred to as "single pipes") and the single pipe clamps (hereinafter simply referred to as "clamps") are both well-known pieces of equipment.

[0033] Clamps 402, 404, and 406 are fixed to the frame member 112. Clamps 402, 404, and 406 are bolt-type clamps and are fixed to the frame member 112 with bolts and nuts (not shown).

[0034] The single pipe 408 is fixed to the frame member 112 by clamps 402, 404, and 406. The protruding end of the single pipe 408 from the trolley 100 is in contact with the hoistway wall 10A.

[0035] Similar to frame member 112, three clamps (not shown) are fixed to frame member 114. The single pipe 412 is fixed by these three clamps. The other end of a threaded rod 416, which has a flange 414 at one end, is inserted into the single pipe 412. For example, a threaded rod is used for the threaded rod 416. A nut 418 with a handle is screwed onto the threaded rod 416. The end face of the single pipe 412 and the side of the nut 418 face each other.

[0036] With the flange 414 in contact with the hoistway wall 10B, when the nut 418 is rotated to screw toward the pipe 412, the side surface of the nut 418 eventually comes into contact with the end surface of the pipe 412. Furthermore, when the nut 418 is tightened further, a bracing force is generated between the pipe 412 and the threaded rod 416 against the hoistway wall 10B and the frame material 114 (cart 100). In other words, the bracing rod 410 is composed of the pipe 412, the threaded rod 416 with flange 414, and the nut 418.

[0037] Clamps 420 and 422, of the same type as clamps 402, 404, and 406, are fixed to the frame member 116. The pipe 424 is fixed to the frame member 116 by clamps 420 and 422. One end of the pipe 424 is in contact with the hoistway wall 10C.

[0038] Two clamps 426 and 428 (Figure 5) are fixed to the frame member 118, just like to the frame member 116. The single pipe 432 is fixed by these two clamps 426 and 428. A threaded rod 436 with a flange 434 is inserted into the single pipe 432, and a nut 438 with a handle is screwed onto the threaded rod 436. This constitutes a tension rod 430 similar to the tension rod 410 described above.

[0039] When the flange 434 abuts against the hoistway wall 10D and the end face of the pipe 432 abuts against the side of the nut 438, and the nut 438 is tightened firmly, a bracing force is generated between the pipe 432 and the threaded rod 436 and the hoistway wall 10D and the frame material 118 (cart 100).

[0040] Here, a pair of pipe 408 and tension rod 410 will be referred to as the "first rod member pair," and a pair of pipe 424 and tension rod 430 will be referred to as the "second rod member pair."

[0041] Next, we will explain the assembly procedure for the support means 400 having the first rod member pair and the second rod member pair, as described above. First, taking into consideration the condition of the bottom of the elevator shaft 10, the main body 4 is placed in a position where it can be stably installed. Next, the single pipe 408 is set in clamps 402, 404, and 406, its position in the longitudinal direction is adjusted, and the end is clamped (fixed to the trolley 100) with the end in contact with the elevator shaft wall 10A. Similarly, the single pipe 424 is set in clamps 420 and 422, its position in the longitudinal direction is adjusted, and the end is clamped (fixed to the trolley 100) with the end in contact with the elevator shaft wall 10C.

[0042] Set the pipe 412 in the clamp (not shown), adjust its position in the longitudinal direction, and clamp it with the flange 414 in contact with the hoistway wall 10B (fixed to the trolley 100). Set the pipe 432 in clamps 426 and 428, adjust its position in the longitudinal direction, and clamp it with the flange 434 in contact with the hoistway wall 10D (fixed to the trolley 100).

[0043] Next, the nuts 438 on the bracing rod 430 of the second rod member pair are slightly tightened. As a result, the bracing force F1 of the bracing rod 430 acts on the trolley 100, and the trolley 100 receives a reaction force F2 from the hoistway wall 10C via the single pipe 424. These F1 and F2 act as a couple that rotates the base 100 in the direction of R1.

[0044] To prevent the base 100 from rotating, the nuts 418 on the bracing rods 410 of the first rod member pair are slightly tightened. As a result, the bracing force F3 of the bracing rods 410 acts on the trolley 100, and the trolley 100 receives a reaction force F4 from the hoistway wall 10A via the single pipe 408. These F3 and F4 act as a couple that rotates the base 100 in the direction of R2, opposite to R1.

[0045] From this point onward, nuts 438 and 418 are tightened alternately little by little to prevent the base 100 from rotating to a degree that would cause problems, that is, to maintain a balance between the couple formed by F1 and F2 of the second rod member pair and the couple formed by F3 and F4 of the first rod member pair. The assembly of the support means 400 is completed when the bracing forces F1 and F3 of the bracing rods 410 and 430 are exerted to the extent that the trolley 100 can be supported by the hoistway walls 10A, 10B, 10C, and 10D so that the trolley 100 does not tilt. As a result, the support means 400 supports the trolley 100 by bracing it against a part of the building (in this example, the hoistway wall) to prevent the trolley 100 from tilting.

[0046] As explained above, the support means 400 is configured to support the trolley 100 on a part of the building located to the side of the main body 4 of the elevated work platform 2 (in this example, the elevator shaft walls 10A, 10B, 10C, and 10D) so that the trolley 100 does not tilt. This makes it possible to prevent the elevated work platform 400 from tipping over even in narrow spaces such as the bottom of the elevator shaft 10, where conventional outriggers that support the platform on the ground (bottom of the elevator shaft) cannot be used.

[0047] Furthermore, as shown in Figure 5, even if the main body 4 is not located in the center of the rectangular elevator shaft 10 in a plan view, the support means 400 can be made functional by adjusting the protruding lengths of each of the single pipes 408, 424, the tension rod 410 (single pipe 412), and the tension rod 430 (single pipe 432) from the main body 4 (cart 100).

[0048] Furthermore, if a building beam (not shown), such as an H-shaped steel beam, exists in front of the longitudinal direction of the single pipes 408, 424, the tension rod 410 (threaded rod 416), and the tension rod 430 (threaded rod 436), and it is not possible to bring the ends of each into contact with the elevator shaft wall, they may be brought into contact with the building beam as part of the building structure.

[0049] Here, a case where the main body 4 is not located in the middle of the elevator shaft 10 (a case where the main body 4 must be positioned off-center from the middle of the elevator shaft 10) is when it is necessary to avoid interference between the guide rails and buffer bases (not shown) installed at the bottom 12 of the elevator shaft 10 and the casters 120 and 122 of the trolley 100.

[0050] If the trolley 100 is off-center from the center of the hoistway 10, for example, as shown in Figure 5, the base floor portion 210 of the work platform 200 will be separated from the hoistway wall 10D, making it difficult to attach hoistway equipment (not shown) to the hoistway wall 10D. On the other hand, the base floor portion 210 and the hoistway wall 10C are at approximately an appropriate distance. Therefore, the elevated work platform 2 has an adjustment floor portion 220 for adjusting the work area. In the example shown in Figure 5, the area enclosed by the dashed line is the appropriate work area.

[0051] <Adjusted floor etc.> Figure 6 shows a perspective view of the upper part of the elevated work platform 2, including the work platform 200 with an adjusted working area and the safety fence 500 installed on the work platform 200.

[0052] The work platform 200 is composed of a base platform 210 and an adjustment platform 220. The adjustment platform 220 consists of a plurality of adjustment plates 221, 222, 223, ..., 230. Each of the adjustment plates 221, ..., 230 is formed by a rectangular metal plate with a rising portion that rises vertically from one side or two adjacent sides. For example, adjustment plate 221 has rising portions on two adjacent sides, and adjustment plate 222 has a rising portion on one side.

[0053] The adjustment plates 221, ..., 230 are fixed and connected to the base floor 210 with bolts. In addition, at key points, the rising portions of adjacent adjustment plates are fixed together with strip-shaped reinforcing plates.

[0054] The adjustment plates 221, ..., 230 are rectangular in shape when viewed from above, and various types with different vertical and horizontal dimensions are available, which can be used depending on the distance from the base floor section 210 to the elevator shaft wall.

[0055] As shown in Figure 5, the distances between the base floor 210 and the surrounding elevator shaft walls 10A, 10B, 10C, and 10D are different. Therefore, Figure 6 shows an example in which adjustment plates 221, ..., 230 having appropriate vertical and horizontal dimensions that result in the appropriate distance between each side of the work platform 200 and the corresponding elevator shaft wall are selected to construct the work platform 200.

[0056] With a work platform 200 consisting of a base floor section 210 and an adjustable floor section 220, even if the shape of the bottom 12 of the elevator shaft 10 prevents the elevated work platform 2 from being placed in the middle of the elevator shaft 10 in a plan view, the work platform 200 can be extended to match the distance to the elevator shaft wall, thus minimizing interference with the installation work of elevator shaft equipment attached to the elevator shaft wall.

[0057] <Anti-swaying mechanism> A safety fence 500 is provided on the work platform 200 to ensure the safety of workers. The safety fence 500 has support posts 502, 504, 506, and 508 located at the four corners of the work platform 200. In addition, support posts 510, 512, 514, 516, 518, and 520 are provided between adjacent support posts (502, 504, 506, and 508). Furthermore, as shown in Figure 6, horizontal bars are provided between adjacent support posts 502, ..., 520.

[0058] Each of the support columns 502, 504, 506, and 508 has support columns 540, 542, and 546 extended upwards, respectively (the support column extended to support column 506 is not shown in Figure 6). A protective ceiling 550 is attached to the upper end of each of the support columns 540, 542, and 546 to protect workers from falling objects from above the elevator shaft 10.

[0059] The support means 400 prevents the elevated work platform 2 from tipping over, but the higher the work platform 200, the more prone the part above the trolley 100 is to shaking. This shaking reduces the work efficiency of workers standing on the work platform 200, which is the upper part of the elevated work platform 2. Therefore, it is also acceptable to provide an anti-swaying means to prevent shaking of the work platform 200 in at least one direction.

[0060] (First anti-swaying means) The first swinging mechanism consists of a clamp fixed to the support column (work platform 200) and a single pipe fixed to the support column (work platform 200) via the clamp.

[0061] Clamps 602 and 604 are attached to support columns 520 and 502, respectively. Clamps 602 and 604 support the single pipe 606. Clamps 602 and 604 are well-known clamps that can be easily tightened and restrained (fixed to the support column) or released (allowing free displacement of the single pipe 606 in the longitudinal direction) by rotating a lever. Note that all clamps attached (fixed) to the support columns, as described later, are the same as clamps 602 and 604.

[0062] Clamps 608 and 610 are attached to support columns 514 and 506, respectively, and the pipe 612 is supported by clamps 608 and 610. Clamps 614 and 616 are attached to support columns 502 and 510, respectively, and the pipe 618 is supported by clamps 614 and 616. Clamps 620 and 622 are attached to support columns 506 and 516, respectively, and the pipe 624 is supported by clamps 620 and 622.

[0063] Here, we will refer to (i) a set of pipe 606 and clamps 602 and 604 as the first unit, (ii) a set of pipe 612 and clamps 608 and 616 as the second unit, (iii) a set of pipe 618 and clamps 614 and 616 as the third unit, and (iv) a set of pipe 624 and clamps 620 and 622 as the fourth unit.

[0064] The mechanism for preventing the working platform 200 from swaying is the same for all of the first to fourth units, so here we will explain using the first unit as an example. First, release the clamps 602 and 604. Next, slide the pipe 606 towards the support column 502 and bring its tip into contact with the hoistway wall 10A (Figure 5). With the pipe in contact, tighten the clamps 602 and 604 to fix the pipe 606 to the support columns 520, 520, and thus to the working platform 200. This prevents the working platform 200 from swaying toward the hoistway wall 10A (Figure 5).

[0065] Similarly, the second unit (single pipe 612) can prevent swaying toward the elevator wall 10B (Figure 5). The third unit (single pipe 618) can prevent swaying toward the elevator wall 10C (Figure 5). And the fourth unit (single pipe 624) can prevent swaying toward the elevator wall 10D.

[0066] By using all of the first to fourth units, shaking in the four directions mentioned above can be prevented; by using three units, shaking in three directions can be prevented; by using two units, shaking in two directions can be prevented; and by using only one unit, shaking in one direction can be prevented. In other words, the first anti-sway means, which includes the first to fourth units, can prevent shaking of the work platform 200 in at least one direction.

[0067] In the example above, each unit (clamp) was attached to a support column, but it is not limited to this, and it may also be attached to the horizontal bar. Also, in the example above, the ends of the single pipes 606, 612, 618, and 624 were brought into contact with the elevator shaft wall, but if there is a building beam (not shown) made of, for example, H-shaped steel, located in front of the longitudinal direction of the single pipes 606, 612, 618, and 624, and it is not possible to bring each end into contact with the elevator shaft wall, it is also acceptable to bring them into contact with the building beam as part of the building structure.

[0068] (Second anti-sway means) The second anti-sway mechanism will be explained with reference to the schematic diagram shown in Figure 7. Figure 7(a) is a plan view of the elevated work platform 2 and landing 14, Figure 7(b) is a front view thereof, and Figure 7(c) is an enlarged view of section A in Figure 7(b). Note that in Figure 7(a), components located above the work platform 200 are omitted. Also, in Figure 7(c), components located below the work platform 200 and the protective ceiling 550 (Figure 6) are omitted.

[0069] The second swinging mechanism has a rope 702. Both ends of the rope 702 are connected to the work platform 200 via shackles (not shown). The middle section of the rope 702 is hooked at two points to header angles 16 that have already been installed during construction work via clamps 704.

[0070] The second swinging means can suppress the swaying of the work platform 200 in the direction away from the landing. The second swinging prevention means is particularly effective when installing equipment inside the elevator shaft at or near the landing. Examples of elevator shaft equipment include brackets under the threshold and landing equipment (neither of which are shown). When installing this equipment, it is necessary to drive anchors into the elevator shaft wall. At the moment the anchors are driven in, a reaction occurs in the direction away from the elevator shaft wall (landing) for the worker, and the work platform 200 also tries to sway (displace) in the same direction away from the landing, but this displacement is suppressed by the second swinging means (rope 702). As a result, the swaying of the work platform 200 can be prevented as much as possible.

[0071] In the example above, the second swinging mechanism is constructed using one rope 702, but it is not limited to this, and the second swinging mechanism may be constructed using multiple ropes. For example, if two ropes are used (hereinafter referred to as the first rope and the second rope), one end of the first rope is connected to one of the clamps 704 shown in Figure 7(a), and the other end is connected to the work platform 200 via a shackle (not shown), while one end of the second rope is connected to the other clamp 704, and the other end is connected to the work platform 200 via a shackle (not shown).

[0072] (Third anti-sway means) Referring to Figure 8, the third anti-sway mechanism will be described, including part of the installation process for the equipment inside the elevator shaft. Figure 8(a) is a plan view of the inside of the elevator shaft before the guide rails are installed, and Figure 8(b) is a plan view of the same after the guide rails are installed. In Figure 8, only the area of ​​the work platform 200 of the elevated work platform 2 is shown. In the figure, the area with diagonal lines is the base floor section 210, and the area around it (in this example, an area extended in two directions (Figure 8(b)) or three directions (Figure 8(a))) is the adjustment floor section 220.

[0073] As shown in Figure 8(a), the rail brackets 18 are installed sequentially from the top of the hoistway. The work platform 200 is lowered in stages from the top of the hoistway. That is, the work platform 200 is stopped sequentially at positions where it is easy to install the rail brackets 18, and the installation work is carried out.

[0074] Once the installation of the rail bracket 18 is complete (at this stage, the work platform 200 is located at the bottom of the hoistway), the work platform 200 is reduced in size (adjusted) to the state shown in Figure 8(b) from Figure 8(a) in order to avoid interference between the rising work platform 200 and the rail bracket 18. In this way, if the installation of equipment inside the hoistway progresses and the work platform 200 interferes with equipment already installed inside the hoistway, the work platform 200 can also be reduced in size. After reducing the size of the work platform 200, the cage guide rails 20 and 22 and the counterweight guide rails 24 and 26 are installed in order from the bottom of the hoistway.

[0075] Once the installation of each of the above guide rails is complete, roller guides 802 and 804 are installed on the elevator car guide rails 20 and 22, which are already laid in the hoistway. Conventional roller guides used in elevator cars (not shown) can be used as roller guides 802 and 804.

[0076] The roller guides 802 and 804 prevent the work platform 200 from shaking during subsequent operations. Specifically, roller guide 802 prevents the work platform 200 from shaking toward the guide rail 20, and roller guide 804 prevents the work platform 200 from shaking toward the guide rail 22.

[0077] If it is not possible to install both roller guides 802 and 804 due to the positional relationship between the work platform 200 and the guide rails 20 and 22, then it is acceptable to install only one of them.

[0078] Although the elevated work platform according to the present invention has been described above based on embodiments, the present invention is not limited to the above-described forms, and for example, the following forms are also possible. (1) In the support means 400 of the above embodiment (Figures 4 and 5), the single pipes 408, 424, etc. are brought into direct contact with a part of the building such as the elevator shaft wall or building beams. However, depending on the height of the trolley 100 from the elevator shaft bottom 12 (the vertical position of the single pipes 408, 424, etc.), there may be cases where the building beams get in the way and prevent contact with the elevator shaft wall, or where it is inconvenient to contact with the elevator shaft wall. Also, even if contact with the building beam is possible, there may be cases where the entire end of the single pipes 408, 424, etc. cannot be brought into contact with the building beam, and only a small portion of the single pipes 408, 424, etc. (end faces) can be pressed against (brought into contact with) the building beam.

[0079] The solution for when the height of the single pipe 408 differs from the height of the building beam 28, indicated by the dashed line, will be explained with reference to Figure 9. Figure 9 is a perspective view of the elevated work platform with the support means attached, similar to Figure 4.

[0080] An auxiliary pipe 452 is connected to the single pipe 408 using a known right-angle clamp 450. The auxiliary pipe 452 is fixed to the building beam 28 using a known catch clamp (not shown). As a result, the trolley 100 receives the reaction force F4 (Figure 5) from the building beam 28, which is part of the building, via the auxiliary pipe 452 and the single pipe 408.

[0081] If the end of the single pipe 424 cannot be brought into contact with a part of the building and must be fixed to a building beam (not shown), the procedure is the same as with the single pipe 408. That is, the auxiliary single pipe 456 is connected to the single pipe 424 using a right-angle clamp 454, and the auxiliary single pipe 456 is fixed to the building beam (not shown).

[0082] (2) In the above embodiment, the first rod member pair was made up of a tension rod 410 on one side and a single pipe 408 on the other, but it is not limited to this, and both may be made up of tension rods. Also, the second rod member was made up of a tension rod 430 on one side and a single pipe 424 on the other, but both may be made up of tension rods. [Industrial applicability]

[0083] The elevated work platform according to the present invention is suitably used, for example, for the installation of equipment inside the hoistway of an elevator with a low lifting stroke. [Explanation of Symbols]

[0084] 2. Elevated work platform 4 Main unit 100 carts 200 work platform 300 Lifting device 400 Support means

Claims

1. A high-altitude work platform having a main body that includes a trolley, a work platform, and a lifting device for raising and lowering the work platform relative to the trolley, and being installed at the bottom of an elevator shaft in a building, A high-altitude work platform characterized by having a support means that supports the trolley so as not to tilt, which is part of a building located to the side of the main body that is placed on the bottom.

2. The elevated work platform according to claim 1, characterized in that the support means supports the trolley by bracing it against a part of the building so that the trolley does not tilt.

3. The aforementioned support means is A first rod member pair including a first rod member and a second rod member that protrude horizontally from the trolley in opposite directions, A second rod member pair including a first rod member and a second rod member that protrude horizontally from the trolley in opposite directions, It has, The first rod member and the second rod member of the first rod member pair are part of the building located in their respective protruding directions, and their displacement in those protruding directions is constrained, and at least one of the first rod member and the second rod member is a bracing rod, and the first rod member pair applies a couple in a first direction to the trolley, The first and second rod members of the second rod member pair are part of the building located in their respective protruding directions, and their displacement in those protruding directions is constrained, and at least one of the first and second rod members is a bracing rod, and the second rod member pair acts on the trolley with a couple in a second direction opposite to the first direction, The elevated work platform according to claim 2, characterized in that the trolley is supported by a part of the building in such a way that it does not tilt, by the bracing force of the bracing rod of the first pair of rod members and the bracing force of the bracing rod of the second pair of rod members.

4. The elevated work platform according to claim 1, characterized in that it has a means to prevent the work platform from shaking in at least one direction.

5. The aforementioned anti-sway means is The elevated work platform according to claim 4, characterized in that one end of the rod member is fixed to the work platform and the other end abuts against a part of the building.

6. The aforementioned anti-sway means is The elevated work platform according to claim 4, characterized in that it is a rope that connects the work platform and a part of the building within the elevator shaft.

7. The aforementioned anti-sway means is The elevated work platform according to claim 4, characterized in that it is a roller guide provided on the work platform and guided by a guide rail already laid in the elevator shaft.

8. The elevated work platform according to any one of claims 1 to 7, characterized in that the work platform has a base floor portion fixed to the lifting device and an adjustment floor portion connected to and fixed to the base floor portion to adjust the work area.

Images