Extraction device

Abstract

To provide an extracting device capable of easily extracting a fixing tool driven into a roadbed to fix a formwork with a simple configuration. [Solution] The extraction device 1 is an extraction device that pulls out a formwork fixing device 9 driven into the roadbed G, and comprises a main body 10 having wheels 20, a hoisting device 31 attached to the main body 10, and a hooking member 4 suspended so that it can be wound up by the hoisting device 31, and the hooking member 4 is provided with a notch that can be hooked onto the formwork fixing device 9, and when the formwork fixing device 9 is pulled out, the hooking member 4 is wound up diagonally to the vertical direction by the hoisting device 31.

Description

[Technical field]

[0001] The present disclosure relates to an extraction device. [Background technology]

[0002] Conventionally, there have been known construction methods such as the set form method, in which a formwork is placed on the roadbed of an asphalt-paved road surface or the like, and concrete is laid inside the formwork (see, for example, Patent Document 1). In this type of construction method, the formwork that supports the sides of the concrete is fixed to the roadbed by, for example, pins. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-36099 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the process of removing the formwork, the pins that secure the formwork are pulled out from the roadbed. Because this task requires a lot of force, traditionally, methods such as using heavy construction machinery have been used. This requires a large work space and creates problems such as loud noise. Therefore, the object of the present invention is to provide an extraction device that solves the above-mentioned problems and is capable of easily extracting fasteners that have been driven into the roadbed to secure a formwork, with a simple configuration. [Means for solving the problem]

[0005] An aspect of the present invention is The formwork fixing tool is driven into the roadbed to fix the formwork supporting the side end of the concrete slab to the roadbed, Driven into the roadbed The above A pulling device for pulling out a formwork fastener, comprising: a main body having wheels; a hoisting device attached to the main body; and a lifting device suspended so as to be able to be lifted up by the hoisting device. , which can be hooked onto the formwork fixing device A hook member and 、When the formwork fixing tool is pulled out, the hooking member is wound up obliquely with respect to the vertical direction by the hoisting device, The wheels include road wheels that run on the roadbed and guide wheels that engage with rails installed on the formwork. It is an extraction device. Effect of the Invention

[0006] According to the present invention, fasteners driven into the roadbed to secure the formwork can be easily pulled out by a simple configuration including a hoisting device. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a front view of an extraction device 1 to which this embodiment is applied, and Fig. 2 is a side view of the extraction device 1. Fig. 3 is a cross-sectional view taken along line AA in Fig. 1. In Fig. 3, for ease of understanding, the cross section of the roadbed G to be worked on is indicated by the symbol B.

[0009] 1, 2, and 3 show a state in which the extraction device 1 is installed on the roadbed G to be worked on, and is in use. Each of Figs. 1 to 3 and Fig. 4 described later shows an X-axis, a Y-axis, and a Z-axis. The X-axis, Y-axis, and Z-axis are mutually perpendicular, the X-axis corresponds to the front-rear direction of the extraction device 1, and the Y-axis corresponds to the left-right direction of the extraction device 1. The Z-axis indicates a vertical direction perpendicular to the roadbed G, and corresponds to the up-down direction of the extraction device 1. In the following description, the positive direction of the X-axis is the forward direction, the positive direction of the Y-axis is the leftward direction, and the positive direction of the Z-axis is the upward direction.

[0010] First, a formwork 81 to be subjected to construction by the extraction device 1 will be described. The formwork 81 is installed to lay a concrete slab 87 on a roadbed G, and is a member made of wood, steel, or other rigid material. The roadbed G is a road surface formed by compacting soil, gravel, or crushed stone, or a surface paved with asphalt. The concrete slab 87 is what is known as concrete pavement.

[0011] The formwork 81 functions as a wall supporting the side end of the concrete slab 87. The formwork 81 is installed so as to extend in a specific direction within the construction area of ​​the concrete slab 87. In this embodiment, the extension direction of the formwork 81 is along the Y-axis. After the formwork 81 is installed, each process of pouring concrete, spreading, compacting, flattening, roughening, and curing is carried out continuously inside the formwork 81 using, for example, multiple machines. An example of this type of construction method is the set form construction method.

[0012] In the above series of steps, the formwork 81 is firmly fixed to the roadbed G so as to support the side end of the concrete slab 87. As a fixing method, a method using a fixing block 83 and a rod-shaped formwork fixing tool 9 that penetrates the fixing block 83 and is driven into the roadbed G is known.

[0013] For example, as shown in FIG. 1 and FIG. 2, the formwork 81 has a wall surface supporting the side end of the concrete slab 87 and a bottom surface disposed along the roadbed G, and has a cross-sectional shape of a generally L-shape in which the wall surface and the bottom surface are integrated. The fixed block 83 is a box-shaped block placed on the bottom surface of the formwork 81. The fixed block 83 is disposed in contact with the outer surface of the formwork 81. The fixed block 83 may be fixed to the formwork 81 by welding or the like. The formwork fixture 9 penetrates the fixed block 83 and is driven into the roadbed G, so that the fixed block 83 prevents the formwork 81 from moving in the horizontal direction. This allows the formwork 81 to be stationary against the pressure applied to the formwork 81 when concrete is poured.

[0014] The fixing blocks 83 are arranged at predetermined intervals in the extension direction of the formwork 81, that is, in the Y-axis direction, and a formwork fixture 9 is driven into each of the fixing blocks 83.

[0015] When removing the formwork 81 after the paving of the concrete slab 87 is completed, the formwork fixing device 9 is pulled out from the multiple fixing blocks 83 arranged along the formwork 81. Since it is difficult to pull out the formwork fixing device 9 by hand, for example, heavy construction machinery has been used. Specifically, the formwork fixing device 9 is connected to the bucket of a backhoe and pulled out. In this work, in addition to the backhoe operator, a worker is required to watch and monitor the area around the backhoe to ensure safety. Similarly, when other construction machinery is used, at least two people are required: a machine operator and a worker to monitor.

[0016] The extraction device 1 is a device used to extract the form fixing device 9, and enables the work of extracting the form fixing device 9 to be performed by one worker while ensuring safety. Since a small number of workers are required, productivity can be improved, and since heavy construction machinery and the like are not used, safety concerns can be reduced.

[0017] The configuration and functions of the extraction device 1 will be described in detail below. The extraction device 1 has a frame-shaped main body 10 composed of multiple pillars 11 and beam members 12, 13, 14, and 15. The main body 10 in this embodiment is composed of four pillars 11 installed in the vertical direction, and two beam members 12, two beam members 13, one beam member 14, and two beam members 15 connecting these four pillars 11.

[0018] The four pillars 11 are located at the front, rear, left and right ends of the main body 10. Therefore, the main body 10 has a rectangular shape when viewed from above, as shown in the cross-sectional view of FIG.

[0019] Two beam members 13 and two beam members 15 are disposed on the left and right ends of the main body 10. Beam member 13 is located at the top of main body 10, extends in the front-rear direction of main body 10, and connects two pillars 11. Beam member 15 is provided parallel to beam member 13, approximately in the center of pillar 11 in the height direction. In other words, beam member 15 extends in the front-rear direction of main body 10, and connects two pillars 11.

[0020] The beam member 12 is located at the top of the main body 10, extends in the left-right direction of the main body 10, and connects the two pillars 11. The beam members 12 are located at the front and rear ends of the main body 10. The beam member 14 is installed parallel to the beam member 12. That is, the beam member 14 extends in the left-right direction of the main body 10, and connects the two pillars 11 located at the rear end of the main body 10. The beam member 14 is not located between the two pillars 11 located at the front end of the main body 10. Therefore, a large opening surrounded by the two pillars 11 and the beam member 12 is formed on the front side of the main body 10, and a worker can use this opening to perform work.

[0021] A stand 18 is attached by welding or the like to the beam member 15 located at the rear of the main body 10. The stand 18 is a plate or frame installed horizontally, and is capable of mounting a generator 38, which will be described later. As shown in FIG. 2, the stand 18 is installed so as to protrude from the rear of the main body 10. When the generator 38 is installed on the stand 18, a downward load is applied to the rear of the main body 10 due to the weight of the generator 38. Therefore, the generator 38 acts as a counterweight against the pulling force of the form fixing device 9 when the pulling device 1 pulls out the form fixing device 9, as will be described later.

[0022] The column 11 is configured by connecting a column portion 11a and a leg portion 11b. The column portion 11a is a hollow tube, the leg portion 11b is located below the column portion 11a, and the upper portion of the leg portion 11b is inserted inside the column portion 11a. The column portion 11a and the leg portion 11b shown in this embodiment are square tubes with a rectangular cross section, but may be cylindrical.

[0023] By changing the length that the upper part of the leg part 11b enters the column part 11a, the overall length of the column 11, i.e., the height of the main body 10, can be adjusted. To adjust the height, adjustment holes 11d and 11e are provided in the column 11. The adjustment holes 11d are through holes drilled in the column part 11a at a predetermined interval in the height direction. The adjustment holes 11e are through holes drilled in the leg part 11b at a predetermined interval in the height direction. The column part 11a and the leg part 11b are connected by inserting the support pin 11c through the adjustment holes 11d and 11e at a position where the adjustment holes 11d and 11e overlap. As shown in FIG. 2, the adjustment holes 11e are provided at a narrower interval than the adjustment holes 11d. The minimum unit of height adjustment of the column 11 is determined by the narrower interval between the adjustment holes 11d and 11e. The range of height adjustment of the pillar 11 is the range of the length in the height direction through which the adjustment holes 11d are drilled plus the length through which the adjustment holes 11e are drilled. Therefore, by making the intervals between the adjustment holes 11d and the adjustment holes 11e different from each other, the range of height adjustment of the pillar 11 can be widened and height adjustment can be made in fine increments.

[0024] Wheels 20 are connected to the lower ends of each of the four pillars 11 constituting the main body 10. The wheels 20 include road wheels 22 and guide wheels 25. In detail, the road wheels 22 are disposed at the lower ends of the two pillars 11 located at the front end of the main body 10, and the guide wheels 25 are disposed at the lower ends of the two pillars 11 located at the rear end of the main body 10.

[0025] The road wheels 22 are wheels that run on the roadbed G, and are, for example, rubber tires. The road wheels 22 are rotatably supported by wheel receiving parts 21 that are connected to the lower ends of the legs 11b.

[0026] The guide wheels 25 run on rails 85 installed on the fixed blocks 83. The rails 85 are installed so as to straddle the multiple fixed blocks 83 installed at a predetermined interval, and extend parallel to the extension direction of the formwork 81. The rails 85 may be steel rails with an I-shaped cross section as shown in FIG. 2, or may have other shapes. The rails 85 may be rails installed for use with the pulling device 1, or may be rails used by other devices for paving the concrete slab 87.

[0027] The guide wheels 25 are, for example, steel wheels configured to be movable along the rails 85, and may have grooves that fit into the rails 85. The rails 85 are rotatably supported by wheel receiving parts 24 connected to the lower ends of the legs 11b.

[0028] The extraction device 1 of this embodiment extracts a plurality of form fixtures 9 arranged along the formwork 81, and is therefore movable in the extension direction of the formwork 81, i.e., in the direction along the Y-axis. Therefore, when the extraction device 1 is in use, the main body 10 is oriented such that the road wheels 22 and the guide wheels 25 rotate in the direction along the Y-axis.

[0029] The extraction device 1 includes a hoisting device 31. The hoisting device 31 is suspended from a central beam member 16 located at the upper part of the main body 10. In detail, the central beam member 16 is fixed to the upper end of the main body 10, straddling two beam members 12. A suspending belt 33 is hung across the center of the central beam member 16, and the suspending belt 33 suspends and supports a support bracket 32 ​​provided at the upper part of the hoisting device 31.

[0030] The hoisting device 31 is, for example, an electric hoist. The hoisting device 31 is connected to a controller 37 via a cable (not shown). The controller 37 has, for example, a plurality of buttons, and causes the hoisting device 31 to perform the operation of winding up and winding down the chain 34 in response to the button operation by an operator. The controller 37 is, for example, attached to the column 11a located in front of the extraction device 1. The power source for driving the hoisting device 31 may be a power supply cable drawn from the outside of the main body 10 and connected to the hoisting device 31, or, for example, a generator 38 may be mounted on the stand 18 and power may be supplied from the generator 38 to the hoisting device 31. In this case, the hoisting device 31, the controller 37, and the generator 38 are connected by a cable (not shown). Each cable is laid, for example, along the column 11 or the beam members 12, 13, 15, etc. According to this configuration, since it is not necessary to connect the extraction device 1 to an external power source, the extraction device 1 can be moved without being restricted by the power supply cable. The generator 38 is a power generating device that generates electricity using fuel such as gasoline or gas.

[0031] A ring-shaped connecting metal fitting 35 is attached to the end of the chain 34, and the connecting metal fitting 35 suspends the hook member 4.

[0032] FIG. 4 is a perspective view of the hook member 4. As shown in FIG. As shown in FIG. 4, the hook member 4 includes a plate-shaped hook portion 41, a hanging portion provided upright on the hook portion 41, and a connector 44 that connects a rod-shaped operating rod 43 to the hanging portion .

[0033] The hanging part 42 is provided with a hole for passing the connecting metal fitting 35. The hook part 41 is a rectangular flat plate, and has a tip projection 45 and an opposing projection 46 protruding from one end of the hook part 41. The tip projection 45 and the opposing projection 46 are provided with a gap therebetween, and a notch 47 is formed between the tip projection 45 and the opposing projection 46.

[0034] The size of the notch 47 is larger than the outer diameter of the formwork fixing device 9 in the X-axis direction. Therefore, as shown by the dashed line in Fig. 4, the formwork fixing device 9 can be easily inserted into the inside of the notch 47. When the hook portion 41 is rotated in the direction shown by the arrow M in the figure with the formwork fixing device 9 in the notch 47, the tip projection 45 and the opposing projection 46 each come into contact with the side surface of the formwork fixing device 9. When the hook portion 41 is further rotated, the tip projection 45 and the opposing projection 46 bite into the side surface of the formwork fixing device 9, and the hook member 4 is firmly hooked to the formwork fixing device 9.

[0035] When the hook member 4 is hooked onto the formwork fixing device 9 and the hoisting device 31 winds up the chain 34, the hoisting force of the hoisting device 31 moves the formwork fixing device 9 upward, allowing it to be pulled out from the roadbed G.

[0036] There are no limitations on the size and position of the notch 47 as long as the formwork fixing device 9 can be accommodated in the notch 47, but it is preferable that the formwork fixing device 9 be positioned on the center line indicated by the symbol C, for example. The center line C is a line that passes through the center of the connector 44 and the center in the width direction of the hook portion 41. When the formwork fixing device 9 is positioned on the center line C and a pulling force is applied to the formwork fixing device 9 by the hook member 4, the generation of a moment in the torsional direction of the formwork fixing device 9 can be suppressed, and the formwork fixing device 9 can be pulled out more smoothly.

[0037] As shown in FIG. 2, when the extraction device 1 is in use, the guide wheels 25 located at the rear end of the main body 10 run on rails 85 on the fixed block 83. The hoisting device 31 is suspended from the top of the main body 10. The position of the hoisting device 31 in the front-rear direction of the main body 10 is not limited, but for example, the hoisting device 31 can be configured to be located at the rear of the main body 10, as shown in FIG. 2, in accordance with the position of the form fixing device 9 on the fixed block 83. In this case, the hoisting device 31 is located almost directly above the form fixing device 9, and the hoisting device 31, the chain 34, and the hooking portion 41 are positioned so as to be aligned on a vertical line. In this configuration, when the hoisting device 31 winds up the chain 34 with the hooking member 4 hooked on the form fixing device 9, the hooking member 4 is pulled up almost directly above, as shown in FIG. 2.

[0038] In the operation of pulling out the formwork fixing device 9, the worker holds the operating rod 43 in his / her hand and moves the hooking member 4 to hook the hooking member 4 to the formwork fixing device 9. Then, the worker operates the controller 37 to cause the hoisting device 31 to perform winding up. At this time, when the worker tilts the operating rod 43 diagonally upward, the tip projection 45 and the opposing projection 46 bite into the formwork fixing device 9, and the formwork fixing device 9 is pulled to the hooking portion 41. After that, the formwork fixing device 9 is pulled straight up by the power of the hoisting device 31. Since the beam member 14 is not arranged on the front surface of the main body 10, the worker can easily handle the hooking member 4 by holding the operating rod 43 in his / her hand. In addition, since the hooking member 4 is configured such that the operating rod 43 extends diagonally upward via the connector 44, the worker can easily grasp the operating rod 43 and perform the work more easily. In a configuration in which the hoisting device 31 is positioned almost directly above the form fixing device 9, a force is applied to the form fixing device 9 in a direction to pull it out almost directly upward. Therefore, the extraction device 1 can quickly extract the form fixing device 9 without damaging the fixed block 83.

[0039] When the hoisting device 31 hoists to pull out the formwork fixture 9, a downward reaction force acts on the hoisting device 31. Therefore, a force in the direction of tipping the main body 10 forward is applied to the main body 10. On the other hand, the extraction device 1 includes a mounting base 18 that protrudes rearward from the back surface of the main body 10, and the mounting base 18 is located on the opposite side of the hoisting device 31 across the guide wheels 25 in the front-rear direction of the main body 10. For this reason, when the generator 38 is mounted on the mounting base 18, a load in the direction of tipping the main body 10 backward is applied due to the weight of the generator 38. That is, with respect to the reaction force applied to the main body 10 when pulling out the formwork fixture 9, the generator 38 acts as a counterweight, and has the effect of making the main body 10 more stable.

[0040] As described above, the extraction device 1 to which the present invention is applied is an extraction device for pulling out the formwork fixture 9 driven into the roadbed G. The extraction device 1 includes a main body 10 having wheels 20, a hoisting device 31 attached to the main body 10, and a hanging member 4 suspended by the hoisting device 31 so as to be hoistable. The hanging member 4 is provided with a notch 47 that can be hooked to the formwork fixture 9. When pulling out the formwork fixture 9, the hanging member 4 is hoisted obliquely with respect to the vertical direction by the hoisting device 31.

[0041] According to this configuration, by hooking the notch 47 of the hanging member 4 to the formwork fixture 9, the formwork fixture 9 can be pulled out from the roadbed G by the power of the hoisting device 31. Therefore, the formwork fixture 9 can be removed by the extraction device 1 having a simple configuration without using construction machinery or the like. Further, in the process of pulling out the formwork fixture 9, since the hanging member 4 is hoisted obliquely with respect to the vertical direction by the hoisting device 31, it is possible to prevent the formwork fixture 9 from coming off the hanging member 4. Therefore, the formwork fixture 9 can be pulled out smoothly.

[0042] By using the extraction device 1, the formwork fixture 9 can be removed without using a large device such as construction machinery, so that monitoring personnel for ensuring safety are unnecessary. Therefore, only the operator who operates the hanging member 4 and the hoisting device 31 can pull out the formwork fixture 9, and the productivity can be improved.

[0043] In the pulling device 1, the form fixing devices 9 are driven into the roadbed G at predetermined intervals in the extension direction of the form 81 installed thereon, and the main body 10 is capable of traveling in the extension direction of the form 81 by means of the wheels 20. According to this configuration, the plurality of formwork fastening devices 9 can be pulled out successively and quickly by moving the pulling device 1 along the extension direction of the formwork 81. Therefore, the plurality of formwork fastening devices 9 can be efficiently removed.

[0044] In the extraction device 1, the main body 10 is equipped with a plurality of wheels 20. The plurality of wheels 20 includes road wheels 22 that run on the roadbed G, and guide wheels 25 that fit into rails 85 installed along the extension direction of the formwork 81 at a height position different from the roadbed G. According to this configuration, since the pulling device 1 is provided with the road wheels 22 that run on the roadbed G and the guide wheels 25 that run at a different height position from the roadbed G, the pulling device 1 can be made to run near the formwork 81. For example, the pulling device 1 can be made to run in a location where a step has been formed in the roadbed G due to the presence of the formwork 81. Therefore, the pulling device 1 can be positioned near the formwork fixing device 9 to pull out the formwork fixing device 9. Furthermore, a plurality of formwork fixing devices 9 can be pulled out one after another while moving the pulling device 1, and the formwork fixing devices 9 can be removed efficiently.

[0045] In the extraction device 1, the main body 10 can be equipped with a generator 38 that supplies power to the hoisting device 31. According to this configuration, the form fasteners 9 can be pulled out using the hoisting device 31 having electric power, without connecting a power supply cable or the like to the hoisting device 31 from outside the main body 10. Therefore, the extraction device 1 can be easily moved, and a plurality of form fasteners 9 can be pulled out one after another while the extraction device 1 is being moved.

[0046] The main body 10 is provided with a stand 18 that protrudes rearward from the back surface of the main body 10 and is capable of mounting a generator 38. The stand 18 is capable of mounting the generator 38 at a position opposite the hoisting device 31 across the guide wheel 25 located on the back surface of the main body 10. Therefore, when the hoisting device 31 performs hoisting, the generator 38 installed on the stand 18 acts as a counterweight, so that the stability of the main body 10 can be further improved when the form fixing device 9 is pulled out.

[0047] The above embodiment shows a specific example to which the present invention is applied, and does not limit the form to which the invention is applied.

[0048] In the above embodiment, the hoisting device 31 is located directly above the form fixing device 9, and the form fixing device 9 can be pulled directly upward by being wound up by the hoisting device 31. This is just one example, and the suspension position of the hoisting device 31 can be changed as desired. For example, the hoisting device 31 may be suspended from the beam member 12. Also, the position of the hoisting device 31 may be shifted from directly above the form fixing device 9, and the form fixing device 9 may be pulled diagonally upward by the hoisting device 31.

[0049] In the above embodiment, the main body 10 does not have to have a rectangular frame structure when viewed from above. Furthermore, the main body 10 is not limited to the example formed of the pillar 11 and the beam members 12, 13, 14, and 15, and may be formed of the pillar 11 and a wall panel, or may have a brace. Furthermore, the hook portion 41 of the hook member 4 may be provided with a mechanism for clamping the formwork fastener 9 or a mechanism for gripping the formwork fastener 9.

[0050] In the above embodiment, the hoisting device 31 has been described as an electric hoist, but the hoisting device 31 may be a manual hoist or may be one operated by another power source.

[0051] In the above embodiment, the extraction device 1 may be a self-propelled vehicle. For example, a motor for driving the road wheels 22 may be provided in the wheel receiving portion 21. In this case, the extraction device 1 may be configured to be capable of mounting a battery that serves as a power source for the motor, or the power generated by the generator 38 may be used as a power source for the motor. Other detailed configurations of the extraction device 1 may also be arbitrarily changed. [Explanation of symbols]

[0052] 1 Extraction device 4 Hooking member 9 Formwork Fixtures 10. Main Unit 11 Pillars 11a Pillar 11b Legs 11c Support pin 11d, 11e adjustment hole 12, 13, 14, 15 Beam members 16 Central beam member 18 Stand 20 wheels 21 Wheel bearing part 22 Road wheels 24 Wheel bearing part 25 Guide Wheel 31 Hoisting device 32 Support bracket 33 Belt 34 Chain 35 Connecting fittings 37 Controller 38 Generator 41 Hook section 42 Hanging part 43 Operation rod 44 Connector 45 Tip protrusion 46 Opposite protrusion 47 Notch 81 Formwork 83 Fixed Block 85 Rail 87 Concrete slab G Roadbed

Claims

1. An extraction device that drives a form fixing device into a roadbed to fix a form that supports a side end of a concrete slab to the roadbed and extracts the form fixing device driven into the roadbed, A body having wheels; A hoisting device attached to the main body; A hook member that is suspended so as to be hoisted up by the hoisting device and can be hooked onto the formwork fixing tool, When the formwork fixing tool is pulled out, the hooking member is wound up obliquely with respect to the vertical direction by the hoisting device, The wheels include road wheels that run on the roadbed and guide wheels that engage with rails installed on the formwork. Extraction device.

2. The formwork fixing tools are driven into the roadbed at predetermined intervals in the extension direction of the formwork installed in the roadbed, The extraction device according to claim 1 , wherein the main body is movable in the extension direction of the formwork by means of the wheels.

3. The body includes a plurality of the wheels, The plurality of wheels include the road wheels that run on the roadbed and the guide wheels that engage with the rails installed along the extension direction of the formwork at a height position different from the roadbed. The extraction device according to claim 2.

4. The extraction device according to claim 1 , wherein the main body is capable of mounting a generator for supplying power to the hoisting device.

5. the main body includes a stand that protrudes rearward from a rear surface of the main body and on which the generator can be mounted, The extraction device according to claim 4 , wherein the generator can be mounted on the stand at a position on the opposite side of the hoisting device with the wheels located on the rear side of the main body interposed therebetween.

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