Pulling-out device

Abstract

To provide a pulling-out device with a simple structure that can easily pull out fixing tools driven into roadbed to fix a formwork.SOLUTION: A pulling-out device 1 for pulling out a formwork fixing tool 9 that has been driven into roadbed G includes a body part 10 with wheels 20, a hoisting device 31 mounted on the body part 10, and a hooking member 4 that is suspended so as to be wound up by the hoisting device 31, the hooking member 4 has a notch that can be hooked onto the formwork fixing tool 9, and when the formwork fixing tool 9 is pulled out, the hooking member 4 is wound up obliquely in the vertical direction by the hoisting device 31.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a pulling-out device.

Background Art

[0002] Conventionally, construction methods such as the set formwork method are known, in which a formwork is installed on a roadbed such as an asphalt-paved road surface, and concrete is laid in the formwork (see, for example, Patent Document 1). In this type of construction method, the formwork that supports the side of the concrete is fixed to the roadbed by, for example, pins.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the process of removing the formwork, an operation of pulling out the pins that fix the formwork from the roadbed is performed. Since a large force is required for this operation, conventionally, methods such as using construction heavy machinery have been adopted. For this reason, there have been problems of requiring a large working space and generating a large amount of noise. Therefore, an object of the present invention is to solve the above-described problems and provide a pulling-out device capable of easily pulling out a fixture driven into a roadbed to fix a formwork with a simple configuration.

Means for Solving the Problems

[0005] Aspects of the present invention relate to a pulling-out device for pulling out formwork fixtures driven into a roadbed, comprising a main body having wheels, a winding device attached to the main body, and a hanging member suspended so as to be windable by the winding device, wherein the hanging member is provided with a notch that can be hooked onto the formwork fixture, and when pulling out the formwork fixture, the hanging member is wound obliquely with respect to the vertical direction by the winding device.

Advantages of the Invention

[0006] According to the present invention, a fixture driven into a roadbed to fix a formwork can be easily pulled out by a simple configuration including a winding device.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a front view of a pulling-out device 1 to which the present embodiment is applied, and FIG. 2 is a side view of the pulling-out device 1. FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1. In FIG. 3, for convenience of understanding, the cross-section of the roadbed G to be constructed is indicated by reference numeral B.

[0009] Figures 1, 2, and 3 show the usage state of the extraction device 1 installed on the roadbed G to be constructed. In each of FIGS. 1 to 3 and FIG. 4 described later, the X-axis, Y-axis, and Z-axis are shown. The X-axis, Y-axis, and Z-axis are orthogonal to each other. 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 the 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 front, the positive direction of the Y-axis is the left, and the positive direction of the Z-axis is the up.

[0010] First, the formwork 81 to be constructed by the extraction device 1 will be described. The formwork 81 is a member installed to lay the concrete slab 87 on the roadbed G and is composed of wood, steel, or other rigid materials. The roadbed G is a road surface formed by compacting soil, gravel, or crushed stone, or an asphalt-paved surface. The concrete slab 87 is a so-called concrete paving.

[0011] The formwork 81 functions as a wall that supports the side ends of the concrete slab 87. The formwork 81 is installed to extend in a specific direction within the construction range of the concrete slab 87. In the present embodiment, the extension direction of the formwork 81 is the direction along the Y-axis. After the formwork 81 is installed, each process of pouring, spreading, compacting, flat finishing, rough finishing, and curing of concrete is continuously performed inside the formwork 81 using, for example, a plurality of machines. Examples of this type of construction method include the set formwork method.

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

[0013] For example, as shown in FIGS. 1 and 2, the formwork 81 has a wall surface that supports the side edges of the concrete slab 87 and a bottom surface that is arranged along the roadbed G, and has a substantially L-shaped cross-section where 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 arranged 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. By driving the formwork fixture 9 through the fixed block 83 and into the roadbed G, the fixed block 83 prevents the horizontal movement of the formwork 81. Thereby, the formwork 81 can be stationary against the pressure applied to the formwork 81 during the placement of concrete.

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

[0015] When removing the formwork 81 after the paving of the concrete slab 87 is completed, the operation of pulling out the formwork fixture 9 is performed from a plurality of fixed blocks 83 arranged along the formwork 81. Since it is difficult to manually pull out the formwork fixture 9, for example, construction heavy machinery may be used. Specifically, the operation of tying the formwork fixture 9 to the bucket of an excavator and pulling it out has been performed. In this operation, in addition to the operator of the excavator, in order to ensure safety, a worker who guards and monitors the surroundings of the excavator is required. Similarly, when using other construction machinery, at least two workers, namely the operator of the machine and the worker who performs the monitoring, are required.

[0016] The extraction device 1 is a device used for extracting the formwork fixture 9, and enables the operation of extracting the formwork fixture 9 to be performed by one worker while ensuring safety. Since the number of required workers is small, productivity can be improved, and concerns about safety can be reduced because construction heavy machinery and the like are not used.

[0017] Hereinafter, the configuration and function of the extraction device 1 will be described in detail. The drawing device 1 has a frame-shaped main body 10 composed of a plurality of columns 11 and beam members 12, 13, 14, 15. The main body 10 of the present embodiment is composed of four columns 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 columns 11.

[0018] The four columns 11 are located at the front, rear, left, and right ends of the main body 10. Therefore, as shown in the cross-sectional view of FIG. 3, the main body 10 is rectangular when viewed from above.

[0019] Two beam members 13 and two beam members 15 are arranged at the left and right ends of the main body 10. The beam member 13 is located at the top of the main body 10, extends in the front-rear direction of the main body 10, and connects the two columns 11. The beam member 15 is provided in parallel with the beam member 13 at approximately the center of the column 11 in the height direction. That is, the beam member 15 extends in the front-rear direction of the main body 10 and connects the two columns 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 columns 11. The beam member 12 is arranged at the front end and the rear end of the main body 10 respectively. The beam member 14 is installed in parallel with 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 columns 11 located at the rear end of the main body 10. There is no beam member 14 between the two columns 11 located at the front end of the main body 10. Therefore, there is a large opening surrounded by the two columns 11 and the beam member 12 on the front surface of the main body 10, and workers can perform operations using this opening.

[0021] A mounting base 18 is attached to a beam member 15 located at the rear part of the main body 10 by welding or the like. The mounting base 18 is a horizontally installed plate or frame and can mount a generator 38 described later. As shown in Fig. 2, the mounting base 18 is installed so as to project rearward of the main body 10. When the generator 38 is installed on the mounting base 18, a downward load is applied to the rear part 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 formwork fixture 9 when the pulling device 1 pulls out the formwork fixture 9 as described later.

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

[0023] By changing the length by which the upper part of the leg part 11b enters the column part 11a, the overall length of the column 11, that is, the height of the main body 10 can be adjusted. For this height adjustment, adjustment holes 11d and 11e are provided in the column 11. The adjustment hole 11d is a through hole drilled in the column part 11a at predetermined intervals in its height direction. The adjustment hole 11e is a through hole drilled in the leg part 11b at predetermined intervals in its height direction. The column part 11a and the leg part 11b are connected by inserting a support pin 11c through them at a position where the adjustment hole 11d and the adjustment hole 11e overlap. As shown in Fig. 2, the adjustment hole 11e is provided at a narrower interval than the adjustment hole 11d. The minimum unit of height adjustment of the column 11 is determined by the interval of the narrower one of the adjustment hole 11d and the adjustment hole 11e. Also, the range of height adjustment of the column 11 is the range obtained by adding the length in which the adjustment hole 11e is drilled to the length in which the adjustment hole 11d is drilled in the height direction. Therefore, by setting the intervals of the adjustment hole 11d and the adjustment hole 11e to different intervals, the range of height adjustment of the column 11 can be widened and height adjustment in fine units can be made possible.

[0024] Each of the four columns 11 that make up the main body 10 has a wheel 20 connected to its lower end. The wheels 20 include road wheels 22 and guide wheels 25. Specifically, the road wheels 22 are arranged at the lower ends of the two columns 11 located at the front end of the main body 10, and the guide wheels 25 are arranged at the lower ends of the two columns 11 located at the rear end of the main body 10.

[0025] The road wheels 22 are wheels that travel on the roadbed G and are, for example, rubber tires. The road wheels 22 are rotatably supported by a wheel receiving portion 21 connected to the lower end of the leg portion 11b.

[0026] The guide wheels 25 are wheels that travel on a rail 85 installed on a fixed block 83. The rail 85 is installed so as to span a plurality of fixed blocks 83 installed at predetermined intervals and extends parallel to the extension direction of the formwork 81. The rail 85 may be a steel rail having an I-shaped cross section as shown in FIG. 2, or may have other shapes. The rail 85 may be installed for using the pulling device 1, or may be a rail used by other devices for laying the concrete slab 87.

[0027] The guide wheels 25 are, for example, steel wheels configured to be movable along the rail 85 and may have a groove that fits into the rail 85. The rail 85 is rotatably supported by a wheel receiving portion 24 connected to the lower end of the leg portion 11b.

[0028] Since the pulling device 1 of the present embodiment pulls out a plurality of formwork fixtures 9 arranged along the formwork 81, it is movable in the extension direction of the formwork 81, that is, in the direction along the Y-axis. For this reason, in the state where the pulling device 1 is in use, the main body 10 is arranged in a direction in which the road wheels 22 and the guide wheels 25 rotate in the direction along the Y-axis.

[0029] The pulling 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. Specifically, the central beam member 16 is fixed across two beam members 12 at the upper end of the main body 10. A suspension belt 33 is stretched across the central part of the central beam member 16, and the suspension belt 33 suspends and supports a support fitting 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 includes, for example, a plurality of buttons, and causes the hoisting device 31 to perform the operations of winding up and winding down the chain 34 in response to the button operations by the operator. The controller 37 is attached to, for example, a column portion 11a located on the front surface of the pulling device 1. The power source for driving the hoisting device 31 may be connected to the hoisting device 31 by drawing in a power supply cable from outside the main body 10, but for example, a generator 38 may be mounted on a mounting base 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 along, for example, the columns 11 and the beam members 12, 13, 15, etc. According to this configuration, since it is not necessary to connect the pulling device 1 to an external power source, the pulling device 1 can be moved without being restricted by the power supply cable. The generator 38 is a power generation device that generates power using fuel such as gasoline or gas.

[0031] An annular connecting fitting 35 is attached to the tip of the chain 34, and the connecting fitting 35 suspends the hooking member 4.

[0032] Figure 4 is a perspective view of the hooking member 4. As shown in Figure 4, the hooking member 4 includes a plate-shaped hooking portion 41, a hanging portion 42 erected on the hooking portion 41, and a connector 44 that connects a rod-shaped operating rod 43 to the hanging portion 42.

[0033] The lower suspension part 42 is provided with a hole for passing the connecting fitting 35. The hanging part 41 is a rectangular flat plate and has a tip projection 45 and an opposing projection 46 protruding from one end of the hanging part 41. The tip projection 45 and the opposing projection 46 are provided at intervals, 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 fixture 9 in the X-axis direction. Therefore, as shown by the dashed line in Fig. 4, the formwork fixture 9 can be easily inserted inside the notch 47. When the hanging part 41 is rotated in the direction indicated by the arrow M in the figure with the formwork fixture 9 inserted into the notch 47, the tip projection 45 and the opposing projection 46 come into contact with the side surfaces of the formwork fixture 9 respectively. When the hanging part 41 is further rotated, the tip projection 45 and the opposing projection 46 bite into the side surfaces of the formwork fixture 9, and the hanging member 4 is firmly hooked on the formwork fixture 9.

[0035] When the hoisting device 31 winds up the chain 34 with the hanging member 4 hooked on the formwork fixture 9, the formwork fixture 9 can be moved upward by the winding force of the hoisting device 31 and pulled out from the roadbed G.

[0036] The size and position of the notch 47 are not limited as long as the formwork fixture 9 can be accommodated in the notch 47. However, for example, it is preferable that the formwork fixture 9 can be positioned on the center line indicated by the reference sign C. The center line C is a line passing through the center of the connector 44 and the center in the width direction of the hanging part 41. When a pulling force is applied to the formwork fixture 9 by the hanging member 4 with the formwork fixture 9 positioned on the center line C, the generation of a torsional moment of the formwork fixture 9 can be suppressed, and the formwork fixture 9 can be pulled out more smoothly.

[0037] As shown in Fig. 2, in the usage state of the pulling-out device 1, the guide wheels 25 located at the rear end of the main body 10 run on the rails 85 on the fixed block 83. The hoisting device 31 is suspended and installed from the upper part of the main body 10. Although the position of the hoisting device 31 in the front-rear direction of the main body 10 is not restricted, for example, it can be configured such that the hoisting device 31 is located at the rear part of the main body 10 in accordance with the position of the formwork fixture 9 on the fixed block 83, as shown in FIG. 2. In this case, the hoisting device 31 is located almost directly above the formwork fixture 9, and the hoisting device 31, the chain 34, and the hanging 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 hanging member 4 hooked on the formwork fixture 9, as shown in FIG. 2, the hanging member 4 is pulled almost straight up.

[0038] In the operation of pulling out the formwork fixture 9, the operator holds the operating rod 43 in hand to move the hanging member 4 and hooks the hanging member 4 on the formwork fixture 9. Then, the operator operates the controller 37 to execute the winding up by the hoisting device 31. At this time, when the operator tilts the operating rod 43 obliquely upward, the tip protrusion 45 and the opposing protrusion 46 bite into the formwork fixture 9, and the formwork fixture 9 is pulled by the hanging portion 41. Thereafter, the formwork fixture 9 is pulled out 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 operator can easily handle the hanging member 4 while holding the operating rod 43 in hand. Further, since the hanging member 4 is configured such that the operating rod 43 extends obliquely upward via the connector 44, the operator can easily grasp the operating rod 43 and perform the work more easily. And in the configuration where the hoisting device 31 is located almost directly above the formwork fixture 9, a force in the direction of pulling out almost straight up is applied to the formwork fixture 9. For this reason, the formwork fixture 9 can be quickly pulled out by the pulling-out device 1 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 pedestal 18 that protrudes rearward from the back surface of the main body 10, and the pedestal 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 pedestal 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 on the formwork fixture 9, and 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 on 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, so that productivity can be improved.

[0043] In the extraction device 1, the formwork fixture 9 is driven in at predetermined intervals in the extending direction of the formwork 81 installed on the roadbed G, and the main body 10 can travel in the extending direction of the formwork 81 by the wheels 20. According to this configuration, by moving the extraction device 1 along the extending direction of the formwork 81, a plurality of formwork fixtures 9 can be sequentially and quickly extracted. Therefore, a plurality of formwork fixtures 9 can be efficiently removed.

[0044] In the extraction device 1, the main body 10 includes a plurality of wheels 20. The plurality of wheels 20 include road wheels 22 that travel on the roadbed G and guide wheels 25 that fit into rails 85 installed along the extending direction of the formwork 81 at a height position different from that of the roadbed G. According to this configuration, since the road wheels 22 that travel on the roadbed G and the guide wheels 25 that travel at a height position different from that of the roadbed G are provided, the extraction device 1 can travel near the formwork 81. For example, the extraction device 1 can travel to a location where a step is formed on the roadbed G due to the presence of the formwork 81. Therefore, the extraction device 1 can be positioned near the formwork fixture 9 to extract the formwork fixture 9. Furthermore, while moving the extraction device 1, a plurality of formwork fixtures 9 can be successively extracted, and the formwork fixtures 9 can be efficiently removed.

[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, without connecting a cable for power supply from the outside of the main body 10 to the hoisting device 31, the formwork fixture 9 can be extracted using the hoisting device 31 having electric power. Therefore, the extraction device 1 can be easily moved, and while moving the extraction device 1, a plurality of formwork fixtures 9 can be successively extracted.

[0046] The main body 10 is provided with a mounting base 18 that protrudes rearward from the rear surface of the main body 10 and can mount the generator 38. The mounting base 18 can mount the generator 38 at a position on the opposite side of the winding device 31 across the guide wheels 25 located on the rear side of the main body 10. Therefore, when the winding device 31 performs winding, the generator 38 installed on the mounting base 18 acts as a counterweight, so that the stability of the main body 10 when pulling out the formwork fixture 9 can be further enhanced.

[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 winding device 31 is located directly above the formwork fixture 9, and the formwork fixture 9 can be pulled directly upward by the winding of the winding device 31. This is an example, and the hanging position of the winding device 31 can be arbitrarily changed. For example, the winding device 31 may be configured to be suspended from the beam member 12. Further, the position of the winding device 31 may be offset from directly above the formwork fixture 9, and the formwork fixture 9 may be pulled obliquely upward by the winding device 31.

[0049] In the above embodiment, the main body 10 does not have to have a rectangular frame structure when viewed from above. Further, the main body 10 is not limited to the example composed of the columns 11 and the beam members 12, 13, 14, 15, and may be composed of the columns 11 and the wall panels, or may have bracing. Further, a mechanism for sandwiching the formwork fixture 9 or a mechanism for gripping the formwork fixture 9 may be provided at the hook portion 41 of the hook member 4.

[0050] In the above embodiment, the winding device 31 is described as an electric hoist, but the winding device 31 may be a manual hoist or may be operated by other power sources.

[0051] In the above-described 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 able to mount a battery that serves as a power source for the motor, or the power generated by the generator 38 may be used as the power source for the above motor. The detailed configuration of the other extraction device 1 can also be arbitrarily changed.

Explanation of Reference Numerals

[0052] 1 Extraction device 4 Hanging member 9 Formwork fixture 10 Main body 11 Column 11a Column portion 11b Leg portion 11c Support pin 11d, 11e Adjustment holes 12, 13, 14, 15 Beam members 16 Central beam member 18 Placing table 20 Wheel 21 Wheel receiving portion 22 Road wheel 24 Wheel receiving portion 25 Guide wheel 31 Hoisting device 32 Support fitting 33 Belt 34 Chain 35 Connecting fitting 37 Controller 38 Generator 41 Hanging portion 42 Suspended portion 43 Operating rod 44 Connector 45 Tip protrusion 46 Opposing protrusion 47 Notch 81 Formwork 83 Fixed block 85 Rail 87 Concrete slab G Roadbed

Claims

1. A pulling-out device for pulling out formwork fixtures driven into a roadbed, comprising: a main body having wheels; a hoisting device attached to the main body; a hanging member suspended by the hoisting device so as to be hoistable; The hanging member is provided with a notch that can be hooked to the formwork fixture, When pulling out the formwork fixture, the hanging member is hoisted obliquely with respect to the vertical direction by the hoisting device. Pulling-out device.

2. The formwork fixture is driven into the roadbed at predetermined intervals in the extending direction of the formwork installed on the roadbed, The main body is capable of traveling in the extending direction of the formwork by the wheels. The pulling-out device according to claim 1.

3. The main body includes a plurality of the wheels, The plurality of wheels include road wheels that travel on the roadbed and guide wheels that fit into rails installed along the extending direction of the formwork at a height position different from the roadbed. The pulling-out device according to claim 2.

4. The main body is capable of mounting a generator for supplying power to the hoisting device. The pulling-out device according to claim .

5. The main body includes a mounting base that protrudes rearward from the back surface of the main body and is capable of mounting the generator, The mounting base is capable of mounting the generator at a position on the opposite side of the hoisting device with the wheel located on the back surface side of the main body sandwiched therebetween. The pulling-out device according to claim 4. ​

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