Lifting device

Abstract

To solve a problem of conventional techniques, that is, to provide a lifting device capable of lifting and lowering a belt conveyor with a lighter weight device than conventional techniques such as Patent Document 1.SOLUTION: A lifting device according to the present invention is a device for lifting a belt conveyor, and comprises a fixed column, a movable column, a mounting body on which a belt conveyor can be mounted, a hoisting device and a pulley. The movable column is inserted into the fixed column so as to be slidable within the fixed column. The fixed column is in a substantially vertical position and the mounting body is positioned below the belt conveyor. When a suspension rope is wound up by the hoisting device, the mounting body raised together with the movable column pushes up the belt conveyor from below. When the suspension rope is unwound by the hoisting device, the belt conveyor mounted on the mounting body descends together with the movable column.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a belt conveyor for transporting materials such as waste generated by tunnel excavation toward the tunnel entrance, and more specifically to an elevator device that can raise and lower the belt conveyor. [Background technology]

[0002] It is said that roughly two-thirds of Japan's land area is mountainous, and as a result, roads, railways, etc. (hereinafter referred to as "roads, etc.") almost always have sections that pass through mountainous areas. To build roads, etc. in mountainous areas, it is common to use either the cut-and-soil method, which excavates part of the slope, or the tunneling method, which hollows out the inside of the natural ground. While the tunneling method tends to have a higher construction cost (construction cost per length of road, etc.) than the cut-and-soil method, it also tends to require less excavated soil (i.e., less soil removal) than the cut-and-soil method, and has the advantage of allowing greater freedom in linear planning of roads, etc. (for example, shortcuts can be taken), and it is said that more than 10,000 tunnels have been constructed in Japan to date.

[0003] Until the 1970s, the main construction method for mountain tunnels was the "sheet pile method," which combined steel arch supports with wooden sheet piles to support the natural ground, but now the New Austrian Tunneling Method (NATM), which actively utilizes the strength of the natural ground, has become the main method. NATM's main feature is its design philosophy, which relies on the strength of the natural ground (arch effect), and as such, it is possible to reduce the scale of tunnel supports compared to the conventional sheet pile method, and also to increase construction speed, thereby reducing construction costs.

[0004] Furthermore, since NATM was first fully implemented in Japan, excavation technology has made great strides, and the development of various auxiliary methods has made it possible to handle a variety of ground conditions. Furthermore, advances in excavation machinery (particularly free-section excavators) have made it possible to choose mechanical excavation in addition to blasting excavation. This mechanical excavation generally involves the use of relatively low strength excavators (for example, uniaxial compressive strength of 49 N / mm2), although this depends on the excavation cross-sectional area and line shape. 2 On the other hand, when the target ground contains bedrock, blasting excavation is often used.

[0005] Furthermore, there are several methods for transporting the rock fragments (rock broken into smaller pieces by blasting) and soil and sand (hereinafter collectively referred to as "waste") generated by blasting excavation out of the mine, including the "tire type," in which the waste is transported by loading it onto a dump truck or similar vehicle; the "rail type," in which the waste is transported using rails laid inside the mine; and the "belt conveyor type," in which the waste is transported using a continuous belt conveyor system also installed inside the mine.

[0006] Of these, belt conveyor waste transport requires the installation of equipment roughly the same length as the entire tunnel (excavation length), but because it does not use fossil fuels like dump trucks do, it does not have a negative impact on the environment (especially the underground environment), and is more economically advantageous than other methods when the excavation length is long.For this reason, belt conveyor systems tend to be used as the waste transport method in tunnels that are relatively long, such as those for bullet trains (for example, the Linear Chuo Shinkansen) and expressways.

[0007] A continuous belt conveyor system typically consists of a belt conveyor, a mobile crusher (mobile crusher), a tailpiece cart, a belt storage device, a main drive device, etc. This belt conveyor is an endless belt that travels between the head pulley on the minehead side and the tail pulley on the tailpiece cart; in other words, the head pulley and tail pulley function as the reversing parts of the endless belt. More specifically, at the head pulley on the minehead side, the endless belt moves from the top to the bottom and reverses its direction from moving toward the minehead to moving toward the face, and at the tail pulley on the face side, the endless belt moves from the bottom to the top and reverses its direction from moving toward the face to moving toward the minehead. In this way, the refuse placed on the top surface of the endless belt is transported to near the minehead.

[0008] Blasting only breaks up the rock into relatively large chunks, which cannot be transported in this state by a belt conveyor. Therefore, a mobile crusher further crushes the rock blocks produced by blasting. The rock (waste) crushed by the mobile crusher is then fed into the tailpiece cart's waste inlet (inlet hopper), and then placed on a belt conveyor for transport toward the minehead. The tailpiece cart is equipped with self-propelled means such as crawlers and tires, and can move (advance) as the face advances. As the tailpiece cart moves forward, it pulls the belt conveyor, and as it does so, it gradually pays out the belt stored in the belt storage device, extending the belt conveyor.

[0009] Various construction machinery and vehicles travel through the tunnel during excavation, including agitator trucks, concrete sprayers, trucks carrying rock bolts and steel supports, explosives trucks, etc. In addition, ventilation pipes for ventilating the tunnel (especially near the tunnel face), lighting fixtures, drainage gutters, etc. are permanently installed along roughly the entire length of the tunnel being excavated, and in cases where a "belt conveyor system" is used, the belt conveyor is also permanently installed.

[0010] On the other hand, tunnel excavation is carried out while taking care not to loosen the ground more than necessary and, for economic reasons, not to pre-excavate more than planned (for example, beyond the pay line). Therefore, the space inside the tunnel (i.e., the internal cross section) is generally constant and the usable space is extremely limited unless there is a special reason, such as providing a turn-tail location (or a vehicle turning point). Furthermore, since air ducts and gutters are permanently installed, construction machinery and other equipment are forced to move within the remaining, relatively narrow space. For this reason, when locating belt conveyors, it is common to plan them so that the tunnel interior can be used effectively, particularly without interfering with the movement of construction machinery. In recent years, belt conveyors are often placed in the upper part of the internal cross section (near the so-called shoulder).

[0011] Once the tunnel has been excavated to a certain extent, secondary lining work is carried out in stages, starting from the tunnel entrance. This secondary lining work is broadly divided into waterproof sheet work, in which waterproof sheets are laid on the tunnel walls, and concrete work, in which the actual concrete is poured. Once secondary lining work begins, a mobile scaffolding cart (known as a sheet cart) for laying the waterproof sheets and a mobile formwork (known as a center) for the concrete work are permanently installed inside the tunnel. Naturally, the sheet cart is positioned closer to the tunnel face than the center cart, and each time construction of a specified area (for example, a 10.5m section) is completed, it is moved toward the tunnel face.

[0012] Sections where center trucks or sheet trucks are located naturally have smaller internal cross-sections than other excavation sections. If a belt conveyor is placed higher (around the shoulder) in such a section with a reduced cross-section, it will be positioned closer to the center of the tunnel, which may interfere with the traffic of construction machinery. Therefore, in sections with a reduced cross-section, it is common to install belt conveyors at a lower position than in other excavation sections. In other words, when a center truck or sheet truck approaches, the belt conveyor, which was supported around the shoulder of the tunnel wall, is moved to a relatively lower position (for example, around the sill).

[0013] After the center trucks and sheet carts have passed through the belt conveyor, the belt conveyor, once relocated to a relatively low position, is then relocated back up again to make effective use of the tunnel's interior. This means that the belt conveyor must be relocated downwards and then upwards again in a relatively short period of time. This relocation work requires the use of aerial work platforms and lifting equipment, which is time-consuming and labor-intensive. Furthermore, tunnel excavation must be stopped (the tunnel face must be stopped) to seal the internal cross section at the work site. Therefore, various technologies have been proposed for raising and lowering belt conveyors installed in tunnels. For example, Patent Document 1 proposes a technology for raising and lowering a belt conveyor using a device that combines a chain block and a framework scaffold. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-125321 Summary of the Invention [Problem to be solved by the invention]

[0015] The technology disclosed in Patent Document 1 involves workers operating chain blocks installed on a frame scaffold to raise and lower a belt conveyor. Chain blocks are characterized by their large gear ratio, allowing them to raise and lower heavy loads with relatively little force. This requires workers to rotate multiple gears (actually, to pull down the chain), which requires considerable effort and time. Furthermore, raising and lowering a belt conveyor of a given length typically requires multiple devices (frame scaffolds and chain blocks) spaced approximately 3 meters apart. Because these devices are relatively heavy (approximately 100 kg), transporting, setting up, and removing them requires time and effort, and the need for hoists and other equipment can even block the working face. Furthermore, if the frame scaffold were to tip over due to carelessness, the heavy weight of these devices poses a risk of workplace accidents, such as injuries to workers.

[0016] The object of the present invention is to solve the problems of the prior art, that is, to provide a lifting device that is lighter than the prior art including Patent Document 1 and that can raise and lower a belt conveyor more quickly. [Means for solving the problem]

[0017] The present invention was made with a focus on the fact that a columnar member inserted into a hollow columnar member can be slid up and down using a hoisting device, and that by making it disassembled, it is possible to reduce the weight during transportation, and is an invention based on an unprecedented idea.

[0018] The lifting device of the present invention is a device for raising and lowering a belt conveyor and includes a hollow, column-shaped fixed column, a hollow (or solid), column-shaped movable column, a base on which the belt conveyor can be placed, a hoisting device capable of winding and unwinding a suspension rope, and a pulley. The base is attached to the upper end of the movable column when in use (i.e., in the used state), and the hoisting device and pulley are attached to the fixed column so that the pulley is above the hoisting device (in the used state). The movable column is inserted into the fixed column so as to be slidable within the fixed column, and the suspension rope of the hoisting device is wound around the pulley and inserted into the fixed column and attached to a part of the movable column (in the used state). Then, with the fixed pillar in an approximately vertical position (including a vertical position) and the support body positioned below the belt conveyor (i.e., in use), when the hoisting device winds up the hanging rope, the support body rises together with the moving pillar and pushes up the belt conveyor from below, while when the hoisting device unwinds the hanging rope, the belt conveyor placed on the support body descends together with the moving pillar.

[0019] The lifting device of the present invention may also be configured so that one or more rotating bodies are provided on the inner surface of the fixed column or the outer surface of the moving column. In this case, when the moving column slides inside the fixed column, the rotating body in contact with the inner surface of the fixed column or the outer surface of the moving column rotates.

[0020] The lifting device of the present invention may further include a guide mechanism. This guide mechanism includes a guide groove provided on one of the inner surface of the fixed column and the outer surface of the movable column along the axial direction of the fixed column (movable column), and a protrusion provided on the other surface and placed in the guide groove. In this case, the movable column slides within the fixed column while the protrusion is guided by the guide groove.

[0021] The lifting device of the present invention may further include a stopper mechanism. This stopper mechanism includes an insertion hole provided in the fixed column and an insert member inserted into the insertion hole. In this case, when the insert member is inserted into the insertion hole, the movable column does not descend below the insert member (when in use).

[0022] The lifting device of the present invention can also be configured such that the support body is detachably attached to a movable column, the movable column is removably inserted into a fixed column, and the suspension rope is detachably attached to the movable column.

[0023] The lifting device of the present invention may further include a plate-shaped base plate and an extendable base jack. The base plate is disposed at the lower end of the fixed column (when in use) and is approximately perpendicular (including perpendicular) to the axial direction of the fixed column. The base jack is attached below the base plate (when in use) and approximately parallel (including parallel) to the axial direction of the fixed column, and is attached to only one side of the base plate relative to the fixed column. In this case, when the lifting device is disposed around an inclined fixed object, the base jack is disposed on the opposite side of the fixed object across the fixed column, and a portion of the base plate on the opposite side of the base jack across the fixed column is engaged with the fixed object. The extension and retraction of the base jack can then be adjusted to place the base plate in an approximately horizontal position (including a horizontal position). [Effects of the Invention]

[0024] The lifting device of the present invention has the following advantages. (1) Because the moving column and the load are raised and lowered using a hoisting device such as a hand winch, work can be performed more efficiently than with a chain block (i.e., the amount of lifting can be adjusted according to the amount of work). (2) The entire device is lighter (approximately 40 kg) than, for example, the device in Patent Document 1, which reduces the time and effort required for installation and removal and is expected to reduce the degree of injury to workers even if the device unexpectedly falls over. Furthermore, by making it possible to disassemble it into small parts (such as the mounting body and moving column, the moving column and fixed column, and the hanging rope and moving column), transportation becomes easier. (3) Since general-purpose products are mainly used, production costs and repair costs in the event of damage are reduced, and modifications and adjustments to suit the construction site are easy. (4) Conventional chain-lock type lifting devices have a mechanism in which one lifting section slides up and down, and therefore the height to which it can be raised is limited. In contrast, the present invention can be configured as a telescopic mechanism using multiple movable columns, which increases the degree of freedom in designing the height to which the support body can be raised compared to conventional technologies. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a side view schematically showing a lifting device of the present invention with a continuous belt conveyor placed thereon. FIG. [Figure 2] FIG. 1 is a side view schematically showing a fixed pole to which a hoisting device and a pulley are attached. [Figure 3] FIG. 4 is a side view schematically showing the moving column and the mounting body. [Figure 4] (a) is a model diagram showing a telescopic mechanism made up of a fixed column and multiple moving columns, with the moving columns housed within the fixed column; (b) is a model diagram showing a telescopic mechanism made up of a fixed column and multiple moving columns, with the moving columns rising from the fixed column. [Figure 5] FIG. 10A is a cross-sectional view showing a moving column rotor provided on the outer surface of the moving column, and FIG. 10B is a cross-sectional view showing a flange rotor provided on the upper flange of the fixed column. [Figure 6] (a) is a cross-sectional view showing a guide groove provided on the inner surface of the fixed column, (b) is a cross-sectional view showing a protrusion provided on the outer surface of the movable column, and (c) is a cross-sectional view showing a fixed column and a movable column with a protrusion arranged in the guide groove. [Figure 7] FIG. 10A is a side view showing an insertion hole provided in a side wall of a fixed column, and FIG. 10B is a side view showing an insert inserted into the insertion hole. [Figure 8] FIG. 1 is a cross-sectional view showing a lifting device equipped with a stage mechanism installed in a tunnel lined with lining concrete. [Figure 9] FIG. 3 is a cross-sectional view schematically showing a stage mechanism of the lifting device. [Figure 10] FIG. 1 is a step diagram showing how to raise a belt conveyor using the lifting device of the present invention. [Figure 11] 1 is a diagram showing steps for lowering a belt conveyor using the lifting device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] An example of an embodiment of the lifting device of the present invention will be described with reference to the drawings. The lifting device of the present invention can be used in a variety of cases, including transporting rubble from a tunnel, transporting rock blocks in a quarry, and transporting various objects in factories and logistics centers. For convenience, however, the following example will be described using a continuous belt conveyor in a tunnel being excavated.

[0027] Fig. 1 is a side view showing a schematic diagram of the lifting device 100 of the present invention with a belt conveyor BC placed on top. As described above, this belt conveyor BC transports waste from the tunnel being excavated toward the tunnel entrance, and therefore the lifting device 100 shown in Fig. 1 is naturally also placed inside the tunnel. In explaining the lifting device 100 of the present invention, positional relationships including up and down may be indicated, but unless otherwise specified, these refer to the positional relationship when the lifting device 100 is in use as shown in Fig. 1 (hereinafter referred to as the "use state").

[0028] As shown in Figure 1, the lifting device 100 of the present invention is mainly composed of a fixed column 110, a moving column 120, a base 130, a hoisting device 140, and a pulley 150. Of these, the fixed column 110 is a hollow column-shaped member (i.e., a tubular member) with an internal space and an axial dimension greater than its cross-sectional dimension. The moving column 120 is also a column-shaped member with an axial dimension greater than its surface dimension, but it can be hollow (i.e., a tubular member) or solid (i.e., a rod-shaped member). The base 130 is capable of placing the belt conveyor BC (or its frame) thereon and is attached to the upper end of the moving column 120.

[0029] The hoisting device 140 is a device that can take up and unwind a suspension rope 141, and Fig. 1 shows a hand winch with a rotating handle as an example of the hoisting device 140. Of course, the hoisting device 140 is not limited to a hand winch, and various conventional devices can be used, such as an electric winch, an engine-powered winch that uses gasoline, a pneumatic winch that is powered by an air motor, or a hydraulic winch. The hoisting device 140 main body is attached to the fixed column 110, and the pulley 150 is attached to the fixed column 110 at a position above the hoisting device 140 main body. Note that this pulley 150 is a so-called "fixed pulley" that does not move from the position where it is attached to the fixed column 110.

[0030] Hereinafter, each of the main elements constituting the lifting device 100 of the present invention will be described in detail.

[0031] (fixed column) FIG. 2 is a side view schematically illustrating a fixed column 110 to which a hoisting device 140 and a pulley 150 are attached. As shown in this figure, the fixed column 110 can have a lower flange 111 attached to its lower end and an upper flange 112 attached to its upper end. However, at least the upper flange 112 is formed in a flange-like shape with a central through-hole to allow the movable column 120 to pass through. On the other hand, the lower flange 111 has a relatively large area to stabilize the fixed column 110 (i.e., the lifting device 100) when in use, and a plate or the like may be attached to support the fixed column 110 from the side. Furthermore, a fixed column 110 with a considerable length (i.e., height) can be formed by connecting an additional relay fixed column 110 above the main fixed column 110 shown in FIG. 2. In this case, a bolt hole provided in the upper flange of the main fixed column 110 and a bolt hole provided in the lower flange of the relay fixed column 110 can be used to detachably connect them using a connecting bolt.

[0032] As shown in Figures 1 and 2, the fixed pole 110 is disposed so that its axial direction is approximately vertical (including vertical) when in use. As described above, the main body of the hoisting device 140 is attached to the fixed pole 110, and the pulley 150 is attached to the fixed pole 110 at a position higher than the main body of the hoisting device 140. When the hoisting device 140 is a hand winch, it is preferable to attach it at a height that makes it easy for an operator to work with when in use. The suspension rope 141 that is wound up and unwound by the hoisting device 140 extends upward from the main body of the hoisting device 140, is wound around the pulley 150, and then enters the fixed pole 110 and hangs down. Therefore, a small hole is provided in the side wall of the fixed pole 110 near the pulley 150 to allow the suspension rope 141 to pass through. The lower end of the hanging rope 141 inside the fixed column 110 is connected to a part (particularly the lower part) of the movable column 120 as described below, so a hanging rope connecting jig 142 is provided at the lower end of the hanging rope 141.

[0033] (moving column and support body) 3 is a side view showing a schematic diagram of the movable column 120 and the mounting body 130. As shown in this figure, the movable column 120 has a flange 121 at its upper end, and a movable column connecting jig 122 can be further installed on top of that. As mentioned above, the mounting body 130 is capable of mounting the belt conveyor BC (or its frame), and therefore its width (the length in the left-right direction in the figure) is designed to be slightly larger than the width of the belt conveyor BC, and protruding plates 131 can be provided on both sides to prevent the belt conveyor BC from falling off. The mounting body 130 can be formed using a square steel pipe, a shaped steel such as an angle iron or a channel iron, or a plate-shaped steel plate.

[0034] A mount body connecting jig 132 is installed below the mount body 130, and by connecting this mount body connecting jig 132 to the movable column connecting jig 122, the mount body 130 can be detachably attached to the movable column 120. Specifically, the bolt holes provided in the movable column connecting jig 122 and the bolt holes provided in the mount body connecting jig 132 are aligned, and then nuts are tightened onto the connecting bolts inserted through these, so that the mount body 130 can be detachably attached to the movable column 120.

[0035] As shown in FIG. 1 , the movable column 120 is inserted (i.e., inserted) into the fixed column 110 after the mounting body 130 is attached to its upper end. More specifically, the movable column 120 is positioned above the fixed column 110, and then the lower end of the movable column 120 is inserted through the upper opening of the fixed column 110. A portion (particularly the lower portion) of the movable column 120 inserted into the fixed column 110 is attached to a suspension rope 141. For example, the suspension rope 141 can be detachably attached to the movable column 120 by aligning the positions of a bolt hole provided near the lower end of the side wall of the movable column 120 with a bolt hole provided in a suspension rope connecting jig 142 at the lower end of the suspension rope 141 and then inserting the bolt through these holes and tightening a nut on the connecting bolt. Alternatively, the suspension rope 141 can be detachably attached to the movable column 120 by engaging a hook provided in the suspension rope connecting jig 142 with the bolt hole or the lower end of the movable column 120. It should be noted that when attaching the suspending rope 141 (especially the suspending rope connecting jig 142) to the moving column 120, it is advisable to attach it before inserting the moving column 120 into the fixed column 110, or to attach it after the moving column 120 and the suspending rope connecting jig 142 have passed outside the fixed column 110 through the lower opening of the fixed column 110 (the central opening of the lower flange 111). While FIG. 1 shows a configuration in which one moving column 120 is inserted into the fixed column 110, this is not limiting, and a configuration including multiple moving columns 120 is also possible by inserting another moving column 120 into the moving column 120. A configuration including multiple moving columns 120 will be described in detail below with reference to FIG. 4. The multiple moving columns 120 each have a different diameter, and these moving columns 120 are housed in order according to their diameters to form a multiple pipe. The other movable columns 120 (hereinafter referred to as "intermediate movable columns 120") except for the innermost movable column 120 (hereinafter referred to as "innermost movable column 120") have pulleys (fixed pulleys) fixed to their upper and lower ends, and are provided with small holes through which the suspension rope 141 passes. Then, the suspension rope 141 is passed through the small holes and wound around the pulley of the intermediate movable column 120, and the suspension rope 141 (particularly the suspension rope connecting jig 142) is attached to a part of the innermost movable column 120.That is, a telescopic mechanism used in a crane boom, a telescope, etc. is configured by a fixed column 110 and multiple movable columns 120 (intermediate movable columns 120 and innermost movable columns 120). This is preferable because it improves the degree of freedom in designing the lift dimension (height) of the support body 130 compared to the prior art.

[0036] (Rotation mechanism) The lifting device 100 of the present invention can also be provided with a rotation mechanism 160 as shown in Fig. 5. Fig. 5 is a cross-sectional view taken along a horizontal plane showing the rotation mechanism 160, in which (a) shows a movable column rotor 161 provided on the outer surface of the movable column 120, and (b) shows a flange rotor 162 provided on the upper flange 112 of the fixed column 110.

[0037] One of the features of the lifting device 100 of the present invention is that the movable column 120 is inserted into the fixed column 110 so as to be slidable, i.e., the movable column 120 slides up and down within the fixed column 110. The rotation mechanism 160 facilitates smoother sliding of the movable column 120. For example, in FIG. 5(a), three movable column rotors 161 are provided on the outer surface of the movable column 120, and a portion (outside) of each movable column rotor 161 abuts against the inner surface of the fixed column 110. As a result, when the movable column 120 slides within the fixed column 110, each movable column rotor 161 rotates accordingly, enabling smoother sliding of the movable column 120. The movable column rotors 161 can be any rotatable structure, such as a tire or wheel that rotates around an axis, or a sphere. 5(a), the moving column rotor 161 is provided on the outer surface of the moving column 120, but a rotor (fixed column rotor) can also be provided on the inner surface of the fixed column 110 instead of (or in addition to) the outer surface of the moving column 120. Furthermore, the moving column rotor 161 can be provided not only in one stage but also in multiple stages in the vertical direction, and of course any number of moving column rotors 161 (including one) can be provided per stage, not just three.

[0038] 5(b), four flange rotators 162 are provided on the upper surface side of the upper flange 112 of the fixed column 110, and a part (inside) of each flange rotator 162 abuts against the outer surface of the movable column 120. As a result, when the movable column 120 slides inside the fixed column 110, each flange rotator 162 rotates accordingly, allowing the movable column 120 to slide more smoothly.

[0039] (Guide mechanism) The lifting device 100 of the present invention may also be provided with a guide mechanism 170 as shown in Fig. 6. Fig. 6 is a cross-sectional view taken along a horizontal plane showing the guide mechanism 170, in which (a) shows a guide groove 171 provided on the inner surface of the fixed column 110, (b) shows a protrusion 172 provided on the outer surface of the movable column 120, and (c) shows the fixed column 110 and the movable column 120 with a protrusion disposed in the guide groove 171. Incidentally, Fig. 5 shows an example in which the fixed column 110 and the movable column 120 have circular cross sections (i.e., cylindrical), but the lifting device 100 of the present invention can use the fixed column 110 and the movable column 120 with any cross-sectional shape, such as a quadrangular cross section (i.e., rectangular column) as shown in Fig. 6.

[0040] As shown in FIG. 6(a), the guide groove 171 has a gap large enough to insert the protrusion 172, and is formed with a predetermined length (including the entire length of the fixed column 110) along the axial direction of the fixed column 110. The movable column 120 is inserted into the fixed column 110 so that the protrusion 172 on the outer surface of the movable column 120 fits into the guide groove 171 on the inner surface of the fixed column 110, whereby the movable column 120 can slide within the fixed column 110 while being guided by this guide mechanism 170. This makes it possible to suppress rotation of the movable column 120 around the vertical axis that occurs during sliding, i.e., the movable column 120 can slide while maintaining the placement of the mount 130 appropriately. Note that in FIG. 6, the guide groove 171 is provided on the inner surface of the fixed column 110 and the protrusion 172 is provided on the outer surface of the movable column 120, but instead of (or in addition to) this, the protrusion 172 can be provided on the inner surface of the fixed column 110 and the guide groove 171 can be provided on the outer surface of the movable column 120.

[0041] (Stopper mechanism) The lifting device 100 of the present invention may also be provided with a stopper mechanism 180 as shown in Fig. 7. Fig. 7 is a side view showing the stopper mechanism 180, where (a) shows an insertion hole 181 provided in the side wall of the fixed column 110, and (b) shows an insert 182 inserted into the insertion hole 181. As shown in this figure, the stopper mechanism 180 is configured to include the insertion hole 181 provided in the side wall of the fixed column 110 and an insert 182 such as a bolt or a pin. Note that in Fig. 7, a straight bolt is used as the insert 182, but this is not limiting and a U-shaped bolt (a so-called U-bolt) may also be used.

[0042] The insertion holes 181 are small holes that penetrate the side wall of the fixed column 110 to the extent that the insertion members 182 can be inserted therethrough, and it is preferable to provide the insertion holes 181 at two opposite locations so that the insertion members 182 can penetrate the fixed column 110 as shown in Figure 7(b). Of course, if U-bolts are used as the insertion members 182, it is preferable to provide two insertion holes 181 at each of the two opposite locations (four locations in total). By inserting the insertion members 182 into the insertion holes 181 as shown in this figure, it is possible to prevent the lower end of the movable column 120 from descending (falling) below the insertion members 182, which is preferable because it is possible to avoid unexpected descent of the belt conveyor BC supported by the mounting body 130. 7(a), the insertion holes 181 are provided in multiple rows (four rows in the figure) on the top and bottom, and the lower limit height of the movable column 120 (the height below which it will not be lowered) can be selected by inserting the inserting material 182 into the desired insertion hole 181, but it is also possible to limit the lower limit height by providing the insertion hole 181 in only one location (one row). Also, by providing a small hole in the movable column 120 and inserting the inserting material 182 into the insertion hole 181 of the fixed column 110 and the small hole in the movable column 120, that is, by having the inserting material 182 penetrate the fixed column 110 and the movable column 120 (sewn together, so to speak), it is possible to more reliably prevent the movable column 120 from lowering.

[0043] (Stage mechanism) The lifting device 100 of the present invention can also be equipped with a stage mechanism 190, as shown in Fig. 8. Fig. 8 is a vertical cross-sectional view showing the lifting device 100 equipped with the stage mechanism 190, installed in a tunnel lined with lining concrete LC. The stage mechanism 190 supports the lifting device 100 in a stable state and so that the fixed column 110 and the movable column 120 maintain a substantially vertical (including vertical) posture.

[0044] The lifting device 100 of the present invention lifts and lowers the belt conveyor BC. Normally, in sections where there is lining concrete LC, the belt conveyor BC is positioned near the lining concrete LC (e.g., at the shoulder), and therefore the lifting device 100 is also positioned close to the lining concrete LC. However, because the lining concrete LC is curved, as shown in Figure 8, when the stage mechanism 190 approaches the lining concrete LC, part of it is placed on the lining concrete LC. Therefore, the stage mechanism 190 of the lifting device 100 is structured so that support legs are provided only on the tunnel interior side (center side), and the other side is engaged with the lining concrete LC. The stage mechanism 190 will be described in detail below with reference to Figure 9.

[0045] 9 is a vertical cross-sectional view schematically showing the stage mechanism 190, which is a support base for the lifting device 100. As shown in this figure, the stage mechanism 190 includes a base plate 191 and a base jack 192, which is a support leg. The base jack 192 is a jack that can be extended and retracted manually or hydraulically, and is equipped with a mechanism that allows it to extend and retract up and down when in use. The base plate 191, on the other hand, is a plate-like member made of a steel plate or the like, on which the fixed column 110 (particularly the lower flange 111) is placed.

[0046] 9, the base jack 192 in use is installed so that the base jack 192 attached below the base plate 191 is in a substantially vertical (including vertical) position and the base plate 191 is in a substantially horizontal (including horizontal) position, and the fixed column 110 (particularly the lower flange 111) is placed on the upper surface of the base plate 191. In other words, the base plate 191 is disposed at the lower end of the fixed column 110 so as to be substantially perpendicular (including perpendicular) to the axial direction of the fixed column 110, and one base jack 192 is disposed below the base plate 191 so as to be substantially parallel (including parallel) to the axial direction of the fixed column 110.

[0047] As can be seen from Figure 9, there are no obstacles on the tunnel interior side of the space below the base plate 191, but the lining concrete LC is placed on the lining concrete LC side. Therefore, a base jack 192 can be placed on the tunnel interior side, meaning that support can be obtained from the ground, but a base jack 192 cannot be placed on the lining concrete LC side. Therefore, the base jack 192 is attached only to one side of the base plate 191 (the tunnel interior side) of the placed fixed column 110, and is not attached to the other side of the base plate 191 (the lining concrete LC side). However, as long as it is attached only to one side of the base plate 191, one or more base jacks 192 can be attached in the tunnel axial direction (the depth direction of the paper in Figure 9).

[0048] With the above configuration, one end of the base plate 191 (the tunnel interior side) is supported by the base jack 192, and the other end (the lining concrete LC side) is supported by the lining concrete LC. Note that a jig fixed to the lining concrete LC can be used to support the other end of the base plate 191 with the lining concrete LC. For example, in Figure 9, the other end of the base plate 191 is supported by engaging a part of the base plate 191 (an angle iron in the figure) with a clamp CL (especially a special-shaped clamp, etc.) anchored to the lining concrete LC. The approximately horizontal position of the base plate 191 can be adjusted by extending and retracting the base jack 192 up and down.

[0049] (Assembly and Disassembly) The lifting device 100 of the present invention can be delivered and installed in the completed state shown in FIG. 1 and can be delivered in the completed state after use. Alternatively, the lifting device 100 can be delivered disassembled. For example, the fixed column 110 (FIG. 2) to which the hoisting device 140 and pulley 150 are attached, the movable column 120 (FIG. 3), and the base 130 (FIG. 3) can be delivered separately and assembled on-site. Specifically, the fixed column 110 is first installed so that its axis is in a substantially vertical position. The base 130 is then attached to the upper end of the movable column 120, and the suspending rope connecting jig 142 for the suspending rope 141 is attached to the movable column 120. Finally, the movable column 120 is inserted into the fixed column 110 to assemble the lifting device 100. When raising and lowering a belt conveyor BC of a predetermined length, it is recommended to install multiple lifting devices 100 at intervals of, for example, about 3 m, as in the prior art.

[0050] The lifting device 100 can also be carried out after being disassembled into the fixed column 110, the movable column 120, and the mounting body 130. Specifically, the lifting device 100 is first laid on its side, and the movable column 120 is removed from the fixed column 110, the suspending rope connecting jig 142 and the mounting body 130 are removed from the movable column 120, and the fixed column 110, the movable column 120, and the mounting body 130 are then carried out as separate units. In this way, the lifting device 100 can be disassembled into the fixed column 110, the movable column 120, and the mounting body 130, making it extremely easy to carry in and out, such as by carrying it manually in some cases.

[0051] (Example of use) FIG. 10 is a step diagram showing how to raise a belt conveyor BC using the lifting device 100 of the present invention, and FIG. 11 is a step diagram showing how to lower a belt conveyor BC using the lifting device 100 of the present invention. As shown in FIG. 10(a), when the hoisting device 140 winds up the hoisting rope 141, the hoisting rope connecting jig 142 at the lower end of the hoisting rope 141 is pulled up, and the movable column 120 inside the fixed column 110 slides upward, resulting in the belt conveyor BC being pushed up onto the support body 130 and moving upward as shown in FIG. 10(b). Also, as shown in FIG. 11(a), when the hoisting device 140 unwinds the hoisting rope 141, the hoisting rope connecting jig 142 at the lower end of the hoisting rope 141 is pulled down, and the movable column 120 inside the fixed column 110 slides downward, resulting in the belt conveyor BC placed on the support body 130 also moving downward as shown in FIG. 11(b). [Industrial Applicability]

[0052] The lifting device of the present invention can be used for tunnel excavation for various purposes, such as road and railway tunnels and headrace tunnels, and can also be used in any situation where rock is excavated and transported, such as in quarries. Considering that the present invention enables the efficient and safe construction of social infrastructure, such as tunnel structures, it can be said to be an invention that can be expected to not only be used industrially but also to make a great contribution to society. [Explanation of symbols]

[0053] 100 Lifting device of the present invention 110 (lifting device) fixed column 111 (Fixed column) bottom flange 112 (Fixed column) upper flange 120 (elevating device) moving column 121 (moving column) flange 122 (Moving column) Moving column connection jig 130 (elevating device) support body 131 (of the mounting body) protruding plate 132 (of the mounting body) mounting body connecting jig 140 (hoisting device) 141 (hoisting device) suspension rope 142 (hoisting device) lifting rope connecting jig 150 (lifting device) pulley 160 Rotation mechanism (of lifting device) 161 (rotating mechanism) moving column rotating body 162 (rotating mechanism) flange rotating body 170 Guide mechanism (for lifting devices) 171 (Guide mechanism) guide groove 172 (Guide mechanism) protrusion 180 (elevator) stopper mechanism 181 (Stopper mechanism) insertion hole 182 (Stopper mechanism) Insert 190 (elevating device) stage mechanism 191 (Stopper mechanism) base plate 192 (Stopper mechanism) base jack BC Belt Conveyor CL Clamp LC Lining Concrete

Claims

1. A device for raising and lowering a belt conveyor, A hollow, column-shaped fixed column; A hollow or solid pillar-shaped moving column; a support body on which the belt conveyor can be placed; a hoisting device capable of winding up and unwinding a suspension rope; a pulley; By utilizing the hole provided in the upper part of the moving column, the hole provided in the lower part of the mounting body, and the bolt, the mounting body is bolted to the upper end of the moving column when in use, The hoisting device and the pulley are attached to the fixed column so that the pulley is higher than the hoisting device when in use, the movable column is inserted into the fixed column so as to be slidable within the fixed column; The hoisting rope of the hoisting device is wound around the pulley and inserted into the fixed column, and is attached to a part of the movable column when in use, When the fixed pillar is positioned vertically or approximately vertically and the mounting body is positioned below the belt conveyor, and when the hoisting device winds up the hoisting rope, the mounting body, which rises together with the moving pillar, pushes up the belt conveyor from below, and when the hoisting device unwinds the hoisting rope, the belt conveyor placed on the mounting body descends together with the moving pillar. A lifting device characterized by:

2. One or more rotating bodies are provided on the inner surface of the fixed column and / or the outer surface of the moving column, When the moving column slides within the fixed column, the rotating body rotates.

2. The lifting device according to claim 1.

3. a guide groove is provided on one of the inner surface of the fixed column and the outer surface of the movable column along the axial direction of the fixed column or the movable column, and a protrusion is provided on the other of the inner surface of the fixed column and the outer surface of the movable column to be disposed in the guide groove; The movable column slides within the fixed column while the protrusion is guided by the guide groove.

3. The lifting device according to claim 1 or 2.

4. The device further includes a stopper mechanism including an insertion hole provided in the fixed column and an insertion member inserted into the insertion hole, When the insert is inserted into the insertion hole during use, the moving column does not descend below the insert.

4. The lifting device according to claim 1, wherein the lifting device is a lifting device for lifting a vehicle.

5. The mounting body is detachably attached to the moving column, The moving column is removably inserted into the fixed column, The suspension rope is detachably attached to the moving column.

5. The lifting device according to claim 1, wherein the lifting device is a lifting device for lifting a vehicle.

6. A flat base plate; and an extendable base jack; the base plate is disposed at the lower end of the fixed column in use so as to be perpendicular or approximately perpendicular to the axial direction of the fixed column; The base jack is attached below the base plate during use so as to be parallel or approximately parallel to the axial direction of the fixed column, Furthermore, the base jack is attached to only one side of the base plate relative to the fixed column, When the base jack is placed around an inclined fixed object, the base jack is placed on the opposite side of the fixed object across the fixed column, and a part of the base plate on the opposite side of the base jack across the fixed column is engaged with the fixed object, and the base plate can be placed in a horizontal or approximately horizontal position by adjusting the extension and contraction of the base jack.

6. The lifting device according to claim 1, wherein the lifting device is a lifting device for lifting a vehicle.

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