A device for installing and relocating heavy-duty supports.

Abstract

To provide a lifting device for installing and rearranging heavy-duty supports, which is equipped with a lifting mechanism other than a ratchet mechanism using a rack and pinion to change the height of the upper column pipe relative to the lower column pipe that constitutes the device. [Solution] In a device Cs for installing and replacing a strong support, which includes a base 11 equipped with a transport handle 9 and left and right tires 10, an upper column pipe 1 that supports the upper end of the strong support SP, and a lower column pipe 2 that is retractably inserted into the upper column pipe 1 to support the lower end of the strong support SP at its lower part and has a binding clamp 5 for the strong support in its middle section, a hoisting mechanism 21 is arranged in the middle section of the back of the lower column pipe as a lifting mechanism Ud for raising and lowering the upper column pipe 1 relative to the lower column pipe 2.

Description

Technical Field

[0001] The present invention relates to an auxiliary device (hereinafter also simply referred to as a device) for safely and labor-savingly performing the installation work of a strong support installed to support heavy objects such as demolition machines used at the site of building demolition work, and the replacement work of moving the strong support to the lower floor and installing it at the required location as the demolition work progresses.

Background Art

[0002] When demolishing a large high-rise building with a multi-layer structure such as an office building or a department store, a demolition crane is carried into the floor slab of the top floor, and first the ceiling is demolished. Then, the crane is moved from the top floor to the lower floor, and the floor slab of the top floor that abuts against the ceiling of the lower floor is demolished. In this way, the floor slabs (ceilings of the lower floors) of each floor are sequentially demolished.

[0003] In building demolition carried out in such a manner, the total weight including the demolition crane and demolition materials is supported by the remaining structure, mainly the floor slab, beam, and column. However, when the strength of the floor slab and beam cannot support the above total weight, the demolition work cannot be carried out safely.

[0004] Conventionally, in order to prevent problems with floor slabs and beams as described above (loading weights exceeding the design live load at the time of new construction), a temporary support called a steel strong support shown in Patent Document 1 is arranged between the floor slab and beam of the floor to be demolished on which the crane is placed and the floor slab and beam of the lower floor. In this specification, "strong support" may also be simply referred to as "support".

[0005] This is because the demolition crane supports the floor slabs of a plurality of floors below the floor where demolition is being carried out by a number of strong supports, and the excessive load applied during the demolition work is dispersed to the remaining building frame.

[0006] And when the demolition of the upper floor is completed, the installed strong support is removed, and the demolition of all floors of the high-rise building is carried out while performing replacement installation by transporting and installing it sequentially to the lower floor.

[0007] Here, we will explain an example of the number of strong supports to be installed during demolition work. The spacing and number of strong supports to be installed are determined by the floor strength of the building to be demolished. As an example, for a floor that requires reinforcement, the floor slab is 6m 2 One support beam is placed per floor, spaced approximately 120 cm apart. Depending on the building's floor area, more than 1,000 beams may be erected on a single floor. This type of strong support reinforcement is then installed on the three floors below the floor where the heavy machinery will be performing demolition work.

[0008] As the demolition work progresses, the installed heavy supports are moved and reinstalled (repositioned) sequentially from the floor where demolition is completed to the floor below. For example, in the case of a 10-story building, a total of 10,000 supports will be repositioned.

[0009] Traditionally, the repositioning of such heavy supports was carried out entirely by hand. However, since each heavy support has a maximum length of 326-606 cm and weighs 49-80 kg, transporting them required one worker to carry one support at a time, or, in the case of telescopic heavy supports, the upper and lower sections were disassembled and carried by one or two workers to the desired location. Once the heavy supports were in place, two workers would work together to erect them and adjust their height by driving anchor bolts into the floor slab.

[0010] The transportation and installation of the heavy supports used in building demolition, as described above, is physically demanding work given the size (length) and weight of the supports, and requires a large number of workers. This has become a major problem, especially given the labor shortage in the industry.

[0011] There is little prior art proposed regarding the installation and relocation of such heavy supports as described above; at best, only Patent Document 2 is known. However, the technology in Patent Document 2 concerns a vertical lift for moving heavy supports from an upper floor to a lower floor, so the transportation (lateral movement) of the heavy supports and the installation at the destination location still had to be done manually.

[0012] With the aim of reducing the labor involved in transporting and installing such heavy supports at their destination, the inventors of this invention previously proposed a "support device for installing and rearranging heavy supports" and obtained Patent No. 7444514 (Patent Document 3).

[0013] The previously patented invention is a structure in which the extension and retraction of the upper and lower column tubes (raising and lowering of the upper column tube) are linked to the vertical movement via a ratchet mechanism using a rack and pinion. Specifically, the device for installing and replacing the heavy-duty support consists of a base equipped with a transport handle and rotating rubber tires, on which an upper and lower column tube that can move vertically and extend / retract is positioned. The upper column tube has an upper clamp for the heavy-duty support at its very top, and the lower column tube has a fixing clamp for the heavy-duty support at its top and a lower clamp for the heavy-duty support at its very bottom. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] Utility Model Registration No. 3162829 Gazette [Patent Document 2] Japanese Patent Publication No. 2009-062729 [Patent Document 3] Patent No. 7444514 [Overview of the project] [Problems that the invention aims to solve]

[0015] In the invention described in Patent Document 3, which was previously patented by the inventors of the present invention, a ratchet mechanism using a rack and pinion was used as a means of raising and lowering the upper column tube for extending and retracting the height between the upper and lower column tubes in an auxiliary device for supporting and transporting a strong support. However, the ratchet mechanism using a rack and pinion proposed earlier is not the only lifting mechanism that can raise and lower the upper column tube relative to the lower column tube to change the height of the upper column tube relative to the lower column tube.

[0016] Therefore, the objective of this invention is to provide a device for installing and repositioning a heavy-duty support equipped with a lifting mechanism other than a ratchet mechanism using a rack and pinion, in order to change the height of the upper column pipe relative to the lower column pipe. [Means for solving the problem]

[0017] The configuration of the device for installing and replacing strong supports according to this invention, which was made with the aim of solving the above-mentioned problems, is as follows.

[0018] The first configuration of the proposed device for installing and rearranging heavy-duty supports (hereinafter simply referred to as "the device") according to this study comprises a base equipped with a transport handle and a pair of rotating left and right tires, and a lower retainer for supporting the lower end of the heavy-duty support to be transported; a lower column pipe positioned on the base with the upper column pipe inserted so that the upper column pipe can be raised and lowered in the vertical direction; an upper retainer for supporting the upper end of the heavy-duty support positioned at the top of the upper column pipe; and fixing means for binding the heavy-duty support positioned in the middle of the lower column pipe, the device for installing and rearranging heavy-duty supports. The lifting mechanism for raising and lowering the upper column pipe relative to the lower column pipe is a hoist-type hoist mechanism located in the middle of the back of the lower column pipe, wherein the tip of the rope that is hoisted up by external force is turned downward at the upper end of the lower column pipe, and the turned tip of the rope is connected to the lower half of the upper column pipe.

[0019] In the above device, the external force for winding up the cable is the rotational force obtained by manually turning a handle provided in connection with the winding cylinder of the cable, or the rotational force of a rotary drive source connected to the shaft of the handle.

[0020] Further, the winding cylinder is provided with an external gear integral with the winding cylinder and a pinion as a drive gear for rotating this gear, and the gear or the pinion is provided with a lock mechanism that also serves as a stopper to hold the rotation stop of the winding cylinder.

[0021] The second configuration of the device of the present invention is, as a lifting mechanism replacing the above winding mechanism, the lower end of a cylinder having a piston rod is arranged on the pedestal on the back surface of the lower column tube, and the upper end of the piston rod is coupled to the upper end of the upper column tube, and a hydraulic cylinder for lifting and lowering the upper column tube by advancing and retracting the piston rod into and out of the cylinder by hydraulic pressure is used.

[0022] The hydraulic cylinder can also be applied in a so-called inverted type in which the tip of the piston rod is arranged on the pedestal and the upper end of the cylinder is coupled to the upper end of the upper column tube. The hydraulic cylinder for lifting and lowering obtains its hydraulic pressure by supplying and discharging pressurized oil generated by operating the handle of a manual hydraulic pump provided in the cylinder, or by supplying and discharging pressurized oil generated by the operation of a hydraulic motor.

[0023] The position of the piston rod in the hydraulic cylinder can be positioned and locked by a lock mechanism including a control valve arranged in an oil passage to control and prevent the movement of the pressurized oil in the cylinder.

[0024] The lifting mechanism in the third configuration of the device of the present invention is, instead of the above winding mechanism and hydraulic cylinder, a rack gear for a worm provided in the longitudinal direction on the back surface of the upper column tube, and a rack - worm gear mechanism for lifting and lowering the upper column tube by a worm gear arranged at the upper end of the lower column tube and meshing with the rack and being rotated by an external force.

[0025] In the third configuration of the lifting mechanism described above, the external force that rotates the worm gear is the rotational force generated by manually rotating a handle provided on the worm gear, or the rotational force generated by a rotational drive source connected to the worm gear.

[0026] The worm gear, as long as it is meshed with the rack on which the load of the upper column tube is applied downwards, will not rotate on its own, that is, it will function as a stopper. However, as a precaution, a mechanical locking mechanism may be connected to this worm gear to forcibly prevent and hold its rotation.

[0027] In the fourth configuration of the device of the present invention, the lifting mechanism is a rack-pinion gear mechanism that raises and lowers the upper column tube by using a rack provided on the upper column tube and a pinion gear that meshes with it and is arranged to be rotated by an external force, instead of the hoisting mechanism, hydraulic cylinder and rack-worm gear mechanism described above.

[0028] The external force used to rotate the pinion gear can be either the rotational force generated by a manual turn handle attached to the pinion gear, or the rotational force generated by a rotational drive source such as a motor connected to the pinion gear.

[0029] The pinion gear is connected to a mechanical locking mechanism that can be engaged with and disengaged from the pinion gear in order to prevent its rotation and hold the upper column tube in place. Alternatively, if a ratchet joint that can switch the ratchet direction is used at the joint between the pinion gear and the rotary handle, the mechanical locking mechanism is unnecessary. [Effects of the Invention]

[0030] In this invention, the lifting mechanism for the upper column pipe in the device for installing and replacing heavy-duty supports, as previously proposed and patented in Patent Document 3, is selectively adopted from one of the following: a lifting device using a hoisting mechanism including wires or chains; a lifting device using a hydraulic cylinder with a piston rod; a lifting device using a rack-worm gear mechanism; or a lifting device using a rack-pinion gear mechanism. This makes it possible to provide a device for installing and replacing heavy-duty supports equipped with various lifting structures. [Brief explanation of the drawing]

[0031] [Figure 1] A front perspective view of the previously proposed and patented device for installing and replacing strong supports (hereinafter referred to as the "prior device"). [Figure 2] Figure 1 shows a rearward perspective view of the prototype device in use. [Figure 3] A rearward perspective view of the first example of the device for installing and replacing strong supports according to the present invention (hereinafter referred to as the "device of the present invention"). [Figure 4] An enlarged perspective view of the main part of the device shown in Figure 3. [Figure 5] A rearward perspective view of a second example of the device of the present invention. [Figure 6] An enlarged perspective view of the main part of the device shown in Figure 5. [Figure 7] A rearward perspective view of a third example of the device of the present invention. [Figure 8] An enlarged perspective view of the main part of the device shown in Figure 7. [Figure 9] A rearward perspective view of the fourth example of the device of the present invention. [Figure 10] An enlarged perspective view showing the main parts of the device in Figure 9. [Modes for carrying out the invention]

[0032] Next, embodiments of the present invention will be described with reference to the figures. Before describing the embodiments of the present invention, the prior art device Cs-1 will first be described with reference to Figures 1 and 2. Figures 1 and 2 show an example of a device for installing and replacing a strong support SP previously proposed by the inventors of this invention, on which this invention is based (hereinafter referred to as "prior device Cs-1"). Figure 1 is a front perspective view of the prior device before use, and Figure 2 is a rear perspective view of the prior device of Figure 1 with a strong support SP (hereinafter, the strong support SP may also be simply referred to as the support SP) set and extended.

[0033] In Figures 1 and 2, 1 is the upper column pipe, which is housed within the lower column pipe, which has a roughly rectangular cross-section, and is capable of moving up and down. The back surface of the lower column pipe 2 has a slit 2a that runs along its entire length, splitting the back wall. On the other hand, on the back surface of the upper column pipe 1 facing the slit 2a, rack teeth 1a are arranged along its entire length. Note that the cross-sectional shapes of the upper column pipe 1 and the lower column pipe 2 may be other shapes such as circles, triangles, or hexagons, in addition to rectangles.

[0034] In the slit 2a formed on the back of the lower column pipe 2, a lower ratchet mechanism 4, identical in specifications to the upper ratchet mechanism 3, is arranged in the lifting mechanism Ud-1. This lower ratchet mechanism 4 has internal ratchet-type, unidirectional rotating pinions that engage with the rack teeth 1a of the upper column pipe 1 at two locations: the upper part and the intermediate part near the lower part. A ratchet handle 4a is provided on the back of the lower ratchet mechanism 4 for ratchet operation by swinging it up and down. Downward swinging of the handle 4a causes the pinion to move the rack (upper column pipe) upward, while upward swinging of the handle 4a does not rotate the pinion due to the ratchet action. Although there is no ratchet handle on the back of the upper ratchet mechanism 3, there is an insertion hole (not shown) for inserting a spade tool. The preceding device Cs-1 moves the upper column pipe 1 upward (raises it) through the action of the ratchet mechanism 4 by swinging the ratchet handle 4a up and down. This is the operation of the lifting mechanism Ud-1 of the preceding device Cs-1. By switching the ratchet mechanism's function to the reverse side, the descent of the upper column pipe 1 can be controlled.

[0035] On the front side of the lower column pipe 2 of the preceding device Cs-1, a coupling clamp 5 is positioned for connecting and holding the strong support SP to this lower column pipe 2.

[0036] A lower retainer 6 is positioned at the lower end of the lower pipe 200 of the strong support SP shown in Figure 2, to support that portion. An upper retainer 7 is positioned at the upper end of the upper pipe 100 of the strong support SP, to connect that portion. This upper retainer 7 is equipped with a pin 12 for connecting to the strong support SP.

[0037] The upper and lower column pipes 1 and 2 of the prototype device Cs-1, which have the above configuration, have the lower end of the lower column pipe 2 erected on the bottom plate of the base 8. The base 8 is also provided with two parallel transport handles 9 connected to the lower column pipe 2 on the rear side of the lower column pipe 2, and is also provided with wheels 10 for movement. The top surface of the base plate of the base 8 is formed into an open box shape and is configured as a storage section 11 for necessary tools and anchor bolts.

[0038] The above is an overview of the previously proposed device for installing and replacing the strong support (preliminary device Cs-1).

[0039] The powerful support SP, which is set in the aforementioned preceding device Cs-1, transported to a predetermined location and installed, and then removed from its installation for relocation and transported to the next floor, has the configuration shown in Figure 2 as an example, and will be outlined below. Note that the structure of the powerful support SP is just one example, and the support SP applied to the devices Cs-2 to Cs-5 of the present invention, which will be described later, may have a different structure.

[0040] The robust support SP, schematically shown in Figure 2, comprises an upper pipe 100 and a lower pipe 200 that houses the upper pipe 100 so that it can be raised and lowered. The lower outer surface of the upper pipe 100 has a screw for height adjustment (not shown in the figure). On the other hand, a height adjustment ring 300, which has an inner female screw that screws onto the screw of the upper pipe 100, is mounted on the upper end of the lower pipe 200 so that it can rotate in place.

[0041] The powerful support SP, extended by the preceding device Cs-1, is configured so that its extended height can be adjusted by rotating the adjustment ring 300. 300a is a foldable handle for rotating the adjustment ring 300. In the powerful support SP, a bottom plate 200a for contacting the floor slab is provided at the lower end of the lower pipe 200, and a top plate 100a for pressing against the ceiling slab is provided at the upper end of the upper pipe 100. Multiple pin holes 100b provided at appropriate intervals on the outer surface of the upper pipe 100 are holes for inserting pins 400 to fix the height of the height-adjusted upper pipe 100 relative to the lower pipe 200.

[0042] The above is an overview of the prior device Cs-1 and the powerful support SP. However, the purpose of this invention is to diversify the lifting mechanism Ud-1 in the prior device Cs-1. Therefore, four devices Cs-2 to Cs-5 of this invention, each equipped with a lifting mechanism Ud-2 to Ud-5, will be described below with reference to Figures 3 to 10.

[0043] Figures 3 and 4 show an example in which the lifting mechanism Ud of the Cs-2, a device for installing and replacing strong supports in this invention, employs a hoist-type lifting mechanism Ud-2 that utilizes a gear ratio.

[0044] In Figures 3 and 4, 20 is a mounting enclosure that houses a box-shaped hoisting mechanism mounted on top of the two handles 9 on the left and right. Inside, a winding drum 21 that winds (or unwinds) the winding cable 22, which will be explained later, is rotatably located in the center, and an external gear 21a that rotates on the same surface as the winding drum 21 is provided as a follower.

[0045] The external gear 21a has a pinion gear 21b that meshes with it, which is mounted on the housing 20 on a shaft parallel to the external gear 21a and acts as a driver. A crank-shaped rotating handle 21c is coaxially attached to this gear 21b.

[0046] On the other hand, a locking lever 21d is positioned on the housing 20, extending from the side wall of the housing 20 toward the pinion gear 21b. The locking lever 21d is biased by a spring force (not shown) so that its tip claw is constantly engaged with the teeth of the gear 21b, locking the rotation of the pinion gear 21b. However, when the winding drum 21 rotates, a notch (or step) is formed on the side wall of the housing 20 where the locking lever 21d is provided, which disengages the locking engagement of the claw of the locking lever 21d from the teeth of the gear 21b against the spring force, holding the locking lever 21d in the unlocked position.

[0047] The winding drum 21, which has a locking and unlocking function due to the action of the pinion gear 21b and the locking lever 21d described above, has the tip of a cable 22 connected to and fixed to it. The cable 22 is fed upward from the winding drum 21, turned downward by a medium-diameter roll 23 provided at the upper end of the lower column pipe 2, and fed out to the lower end of the upper column pipe 1.

[0048] The above configuration constitutes the first example of a hoist-based lifting mechanism Ud-2 applied to the Cs-2, a heavy-duty support installation and repositioning device according to the present invention. Next, an example of its operation will be described.

[0049] The Cs-2, a heavy support installation and repositioning device equipped with the above-mentioned lifting mechanism Ud-2, is moved to a predetermined position where the support SP is waiting by the functions of the handle 9 and wheels 10, and then positioned upright. In this state, the position of the device Cs-2 is adjusted so that the retracted heavy support SP is adjacent to the front of the base 8, and the device is stood upright. The heavy support SP is then attached to the device Cs-2 by the connecting clamp 5, thereby setting the heavy support SP on the device Cs-2.

[0050] The device Cs-2, with the support SP installed, moves the support SP to its installation position (destination) by operating the handle 9 and the action of the wheels 10. Once it reaches the destination, the device Cs-2 is raised upright, and in this state, anchor bolts are inserted into the bolt holes of the bottom plate 200a, which is located at the lower end of the lower pipe 200, and these bolts are embedded in the floor slab to fix the position of the support SP.

[0051] Next, when the rotating handle 21c of the lifting mechanism Ud-2 shown in Figures 3 and 4 is rotated in the forward direction to wind the cable 30 onto the winding drum 21, the upper column pipe 1, whose lower end is connected to the tip of the cable 30, slides upward inside the lower column pipe 2, and the height of the tip of the upper column pipe 1 increases. As a result, the upper pipe 100 of the support SP, which is connected to the upper end of the upper column pipe 1 by the upper retainer 7, also moves upward in conjunction with the upper column pipe 1.

[0052] As the upper column pipe 1 is raised further, causing the upper pipe 100 to rise as well, the adjustment screw (not shown in the diagram) located at its lower end reaches the screw portion located on the inner surface of the adjustment ring 300 positioned at the upper end of the lower pipe 200. By rotating the adjustment ring 300 using its handle 300a, the top plate 100a at the upper end of the raised upper pipe 100 is brought into close contact with the ceiling slab, thus completing the installation of the strong support SP. Once the installation is complete, the coupling clamp 5 is released to separate the device Cs-2 from the installed support SP.

[0053] As described above, when the demolition of the upper floor is completed and the demolition site moves to the lower floor, the anchor bolts of the support SP installed on the floor directly below are removed and the tension of the support SP is released. At the same time, the support SP is reconnected and integrated with the device Cs-2 using clamp 5, and the upper and lower ends of the support SP are supported by upper and lower retainers 7 and 8 provided at the ends of the upper column pipe 1 and lower column pipe 2. In this state, the pin 400 between the upper pipe 100 and the lower pipe 200 is removed, and then the adjustment ring 300 is reversed to remove the screw of the adjustment ring 300 from the screw of the upper pipe 100.

[0054] When the upper pipe 100 and lower pipe 200 of the strong support SP are in the above state, the pinion gear 21b, which was locked by the locking lever 21d of device Cs-2 with the lower pipe 200 connected to device Cs by clamp 5, is released. This allows the cable 30 that was wound on the winding drum 21 to be unwound from the winding drum 21 and the winding drum 21 to be reversed, causing the upper column pipe 1 to shrink and fit inside the lower column pipe 2. At this time, the upper pipe 100 of the support SP also fits inside the lower pipe 200 and shrinks to its size. Then, device Cs-2 is transported using the handle 9 to carry the support SP to the entrance hole to the lower floor, detached from device Cs-2, and sent to the lower floor.

[0055] The above is a description of the present invention's device Cs-2, which employs the first example of the lifting device Ud-2.

[0056] In this invention, the devices Cs-3 to Cs-5 of this invention, which employ the lifting devices Ud-2 to Ud-5 of the second to fifth examples, differ only in that the lifting mechanisms Ud-2 to Ud-5 are different from device Cs-2 of the above example. However, the handling of setting the strong support SP into the device, transporting it, installing the support SP at the destination, removing the installed strong support SP, and setting it up for replacement remains unchanged.

[0057] Therefore, the following embodiments of the present invention will focus on explaining the lifting mechanisms Ud-3 to Ud-5.

[0058] In the device Cs-3 of the present invention, which is equipped with a third example of a hydraulic cylinder type lifting mechanism Ud-3 as shown in Figures 5 and 6, a hydraulic cylinder 30 is used as the lifting means. The hydraulic cylinder 30 is sized such that the total length of the cylinder 30a is approximately equal to the height of the lower column pipe 2 of the device Cs-3 of the present invention, and the top dead center position of the piston rod 30b is approximately equal to the maximum height when the upper column pipe 1 is extended.

[0059] The lower end of the cylinder 30a is mounted on the base 11 to the axle 10a of the wheel 10 via a bracket portion 30c. The bracket portion 30c is equipped with a hydraulic pump 31 with a plunger piston on its rear side, and a lever handle 32 connected to the plunger piston is also provided.

[0060] When the lever handle 32 is swung back and forth, the hydraulic pump 31 pushes up the piston inside the cylinder 30a hydraulically, causing the piston rod 30b to rise. Since the upper end of the piston rod 30b is connected to the upper column pipe 1 by the upper retainer 7, the upper column pipe 1 also rises.

[0061] Since the connection point between the upper end of the piston rod 30b and the upper column pipe 1 is formed by an upper retainer 7 that is connected to the top plate 100a at the upper end of the upper pipe 100 of the strong support SP, the rise of the upper column pipe 1 causes the upper pipe 100 of the strong support SP to rise simultaneously.

[0062] In this way, when the piston rod 30b reaches the upper end (upper hole point) of the cylinder, the upper pipe 100 of the strong support SP supported by the device Cs-3 of the present invention also rises, bringing the top plate 100a at the upper end closer to the slab floor (ceiling).

[0063] Once the support SP is extended, the adjustment ring 300 on the support SP is rotated to ensure that the top plate 100a of the upper pipe 100 is in close contact with the ceiling slab. At the same time, anchor bolts are driven into the bottom plate 200a at the lower end of the lower pipe 200 to fix the support SP to the floor slab, and the connecting band 5 is released to complete the installation of the support SP.

[0064] To lower the upper column pipe 1, which has been extended by hydraulic pressure, the hydraulic pressure is released by operating the release valve (not shown in the diagram), allowing the upper column pipe 1 to lower (contract) due to its own weight.

[0065] Figures 7 and 8 show an overview of the present invention's device Cs-4, which employs a lifting mechanism Ud-4 using a rack gear and a worm gear.

[0066] In this embodiment, a rack gear 40 is arranged over substantially the entire height of the back surface of the upper column pipe 1 of the device Cs-4, while a worm gear 41 that meshes with the rack gear 40 is arranged at the upper end of the lower column pipe 2. This worm gear 41 is rotated in forward and reverse directions, for example, by a ratchet-type horizontal rotating handle (not shown), or by a drive unit 42 of an electric screwdriver.

[0067] Since this lifting device Ud-4 consists of a rack gear 40 for a worm gear and a worm gear 41 that meshes with it, the upper column pipe 1 is positioned in that position simply by stopping the rotation of the worm gear 41, so no special stopper mechanism or locking mechanism is required.

[0068] Figures 9 and 10 show an overview of the fifth lifting mechanism Ud-5, a rack and pinion type, which consists of a rack gear 50 provided along approximately the entire length of the back of the upper column pipe and a pinion gear 51 that meshes with this gear, provided at the upper end of the lower column pipe 2.

[0069] When the pinion gear 51 is rotated forward with the handle 52, the upper column tube 1 rises, and when it is rotated backward, the upper column tube 1 lowers. If rotation is free in either direction, it is impractical because the height position of the upper column tube 1 cannot be positioned in either the upward or downward direction.

[0070] In this invention, a mechanism can be provided in which a ratchet joint 53, which allows switching of the ratchet direction, is inserted between the crank-shaped handle 52 and the pinion gear 51 (connecting part or linking part). For example, on the upward side of the upper column pipe 1, by swinging the handle 52 back and forth in a clockwise direction, the ratchet joint allows the upper column pipe 1 to be raised. Furthermore, even if you release your hand from the handle 52, the ratchet action prevents the upper column pipe 1 from descending due to its own weight, allowing it to be positioned in place.

[0071] On the other hand, when lowering the raised upper column pipe 1, the ratchet direction of the ratchet joint 53 is switched, and the handle 52 is oscillated back and forth in a counterclockwise direction. By applying a brake to the descent of the upper column pipe 1 due to its own weight, the descent of the upper column pipe 1 can be controlled to prevent it from descending uncontrollably on its own.

[0072] The device for installing and repositioning heavy supports according to this invention is as described above and is extremely suitable for installing and repositioning heavy supports that are excessively heavy and large in size, such as those used at demolition sites of high-rise buildings. [Explanation of symbols]

[0073] Cs-2~Cs-5 Invented device Ud-2~Ud-5 Lifting mechanism used in the device Cs-2~Cs-5 of this invention 20 Installation enclosures 21 Rolled body 21a External gear 21b Pinion Gear 21c handlebars 21d Lock lever

Claims

1. A device for installing and rearranging a heavy support, comprising: a base on which the lower end of the heavy support to be transported is placed, equipped with a transport handle and a pair of rotating left and right tires; a lower column pipe positioned on the base with the upper column pipe inserted to allow the upper column pipe to be raised and lowered in the vertical direction; an upper retainer for the heavy support with the upper column pipe positioned at the top; and a fixing means for the heavy support positioned in the middle of the lower column pipe, A device for installing and replacing a heavy support, characterized in that the lifting mechanism for raising and lowering the upper column pipe relative to the lower column pipe is a hoist-type hoist mechanism located in the middle of the back of the lower column pipe, and a rope that is hoisted up by an external force into this hoist mechanism is turned downward at the upper end of the lower column pipe, and the tip of the turned rope is connected to the lower half of the upper column pipe.

2. The device for installing and replacing a powerful support according to claim 1, wherein the external force for winding up the cable is the rotational force of turning a handle connected to the winding drum of the cable by human power, or the rotational force of a rotational drive source connected to the shaft of the handle.

3. The device for installing and replacing a strong support according to claim 1, wherein the winding drum is equipped with a locking mechanism that also serves as a stopper to maintain rotational cessation.

4. The lifting mechanism is a hydraulic cylinder for lifting, wherein, in place of the hoisting mechanism of claim 1, the lower end of a cylinder having a piston rod is placed on the base and the upper end of the piston rod is connected to the upper end of the upper column tube, or the tip of the piston rod is placed on the base and the upper end of the cylinder is connected to the upper end of the upper column tube, and the upper column tube is raised and lowered as the piston rod moves back and forth relative to the cylinder. This is the device for installing and replacing a strong support according to claim 1.

5. The apparatus for installing and replacing a strong support according to claim 4, wherein the hydraulic pressure for raising and lowering the hydraulic cylinder is hydraulic pressure generated by operating the handle of a manual oil supply and discharge pump provided on the cylinder, or hydraulic pressure generated by operating a hydraulic motor.

6. The device for installing and replacing a strong support according to claim 5, wherein the position of the piston rod relative to the cylinder is positioned and locked by a locking mechanism placed in the oil passage to prevent the movement of oil within the cylinder.

7. The device for installing and replacing the strong support according to claim 1, wherein the lifting mechanism is a rack-worm gear mechanism for lifting the upper column tube, comprising a rack installed in the longitudinal direction on the back of the upper column tube and a worm gear positioned at the upper end of the lower column tube so as to mesh with the rack and be rotated by external force, instead of the hoisting mechanism of claim 1.

8. The apparatus for installing and replacing a powerful support according to claim 7, wherein the external force that rotates the worm gear is the rotational force generated by a manual operation of a rotating handle provided on the worm gear, or the rotational force generated by a rotational drive source connected to the worm gear.

9. The device for installing and replacing a strong support according to claim 7, wherein a locking mechanism for preventing and holding the rotation of the worm gear is connected to the worm gear.

10. The device for installing and replacing the strong support according to claim 7, wherein the lifting mechanism is a rack-pinion gear mechanism for lifting the upper column tube, comprising a rack of the upper column tube and a pinion gear arranged to mesh with it and be rotated by an external force, instead of the rack-worm gear mechanism of claim 7.

11. The device for installing and replacing a powerful support according to claim 10, wherein the external force that rotates the pinion gear is the rotational force generated by human power from a rotating handle provided on the pinion gear, or the rotational force generated by a rotational drive source connected to the pinion gear.

12. The device for installing and replacing a strong support according to claim 10, wherein a locking mechanism for preventing and holding the rotation of the pinion gear is arranged in conjunction with the pinion gear.

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