JP3885739B2 - Deck plate cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deck plate cutting device, and more particularly to a deck plate cutting device suitable for cutting a concave portion of a deck plate forming a ceiling of a concrete building.
[0002]
[Prior art]
As for the concrete construction that forms the ceiling of concrete buildings such as buildings of nuclear power plants, instead of the former formwork, as shown in FIG. It is being adopted. The deck plate 1 is made by pressing a thin steel plate into an uneven shape to give strength. Even after the concrete 2 is solidified, the deck plate 1 is not removed and used as it is as a ceiling surface. By the way, various pipes and ducts installed in a building are often arranged in the vicinity of the ceiling, and these heavy objects are usually supported by using steel brackets suspended from the ceiling. However, the thickness of the deck plate 1 is about 3 to 6 mm, and the strength of the deck plate 1 is insufficient to use a bracket that receives a heavy load directly welded to the deck plate 1. For this reason, the embedded metal object 4 provided with the anchor 3 is arranged in advance before pouring the concrete 2 at a position where the bracket is required.
[0003]
After the concrete 2 is solidified, the portion of the deck plate 1A where the embedded metal piece 4 is disposed is cut and removed as shown in FIG. A bracket is welded to the exposed surface of the embedded metal 4 to receive a heavy load. Since the anchor 3 of the embedded metal 4 is firmly embedded in the solidified concrete 2, the embedded metal 4 can sufficiently withstand the load of the heavy object due to the strength of the concrete 2.
[0004]
By the way, when carrying out the above construction method, it is difficult to cut and remove the deck plate 1A. It is an upward work on a high ceiling, and the deck plate 1 has an uneven shape, so it is difficult to adjust the angle of the torch when performing gas cutting or plasma cutting. For this reason, there were problems in terms of work safety and work efficiency. In order to improve such a problem, Patent Document 1 discloses a deck plate cutting device having a structure in which a long rotary blade is moved along a cutting line of a deck plate.
[0005]
[Patent Document 1]
JP 2002-38719 A [0006]
[Problems to be solved by the invention]
However, although the deck plate cutting device disclosed in Patent Document 1 is devised everywhere for field work, the shape and weight are still excessive and are difficult to apply to field work. Further, there is a problem that it is difficult to cut the inclined surface of the recess 1B of the deck plate 1 shown in FIG.
[0007]
The present invention was devised under the above background, and an object of the present invention is to provide a deck plate cutting device that is easy to handle for field work, and is particularly suitable for cutting a concave portion of a deck plate. It is in.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a deck plate cutting device according to the present invention includes a main body portion that is mounted in a concave portion of the deck plate, a support shaft provided on the main body portion, and a slide relative to the support shaft. A pivoting arm that is pivotably engaged with the pivot as a fulcrum, a cutting tool attached to the pivoting arm, and a pin provided on the pivoting arm, and the tip of the cutting tool Is provided with a guide groove for guiding the pivoting movement of the pivoting arm so as to move close to the inner surface of the recess of the deck plate.
[0009]
Further, the present invention is characterized in that, in the above configuration, the support shaft is a rotating shaft, and the rotating arm is rotated by a rotational force of the rotating shaft. Further, the present invention is characterized in that, in the above configuration, the main body is magnetically attached to the deck plate by a magnet attached to the main body.
[0010]
[Action]
According to the present invention, the turning operation of the turning arm to which the cutting tool is attached is guided by the guide groove so that the tip of the cutting tool moves close to the inner surface of the concave portion of the deck plate . For this reason, the front-end | tip part of a cutting tool can be moved substantially perpendicularly with respect to the inner surface of the recessed part of a deck plate, and it can move closely, and the recessed part of a deck plate can be cut | disconnected skillfully. In addition, since the drive unit is small and compact and lightweight, it is easy to handle for field work.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a deck plate cutting device according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a deck plate cutting apparatus 10 according to the first embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG. Above the deck plate 12, there is already solidified concrete 14, and the deck plate 12 forms the ceiling surface of the building. An embedded metal 16 is disposed in the portion of the deck plate 12, and the deck plate cutting device 10 is mounted in the recess 12 </ b> A of the deck plate 12 in order to expose the surface of the embedded metal 16.
[0012]
The deck plate cutting device 10 is a dedicated device for cutting only the inner cross section of the recess 12A shown in FIG. 1. The deck plate cutting device 10 mainly includes a main body 18, a rotary shaft 20 provided on the main body 18, and a rotary shaft. A rotating arm 22 that is slidable with respect to the rotating shaft 20 and is rotatably engaged with the rotating shaft 20 as a fulcrum, a cutting tool 24 attached to the rotating arm 22, and a pin provided on the rotating arm 22 50, and a guide groove 52 that guides the turning motion of the turning arm 22 so that the distal end portion of the cutting tool 24 always moves in close proximity to the inner surface of the recess 12A of the deck plate 12.
[0013]
The main body portion 18 has a structure in which a pair of side plates 26 and 28 are connected by a plurality of connecting rods 30 at intervals in parallel, and the outer surface is covered with a cover (not shown). The shape of the upper part 27 of the side plates 26 and 28 is matched with the inner surface dimension of the concave part 12A of the deck plate 12, and the shoulder part 27A protruding to the lower part contacts the convex part 12B of the deck plate 12. A magnet 29 is attached to the shoulder 27A. For this reason, when the deck plate cutting device 10 is brought close to the recess 12A of the deck plate 12, the main body 18 is magnetically attached to the recess 12A of the deck plate 12 by the magnetic force of the magnet 29, and there is no backlash with respect to the recess 12A. Positioned in the state. Further, a guide groove 52 having a predetermined shape for guiding the turning operation of the turning arm 22 is cut in the side plate 28.
[0014]
Inside the main body 18, the rotary shaft 20 is spanned between bearings 32 provided on the side plates 26 and 28, and the right end of the rotary shaft 20 protrudes outside the side plate 28. A motor 36 is housed inside the main body 18 via a bracket 34 connected to the upper connecting rod 30. The rotation of the motor 36 is transmitted to the rotary shaft 20 by the reduction gear mechanism 38. An operation switch (not shown) is attached to the motor 36, and the rotary shaft 20 rotates in both forward and reverse directions by operating the operation switch. An inner arm 40 that rotates integrally with the rotary shaft 20 is disposed inside the side plate 28. One end of the inner arm 40 is fixed to the rotary shaft 20. An elongated slot 42 is cut at the other end of the inner arm 40, and a pin 50 described later is slidably engaged with the slot 42.
[0015]
The rotary arm 22 has an elongated long groove 44 cut at one end thereof, and the right end of the rotary shaft 20 is slidably engaged with the long groove 44. A pin 50 is fixed to the other end of the rotating arm 22. The pin 50 engages with a guide groove 52 provided in the side plate 28 and slidably engages with the long groove 42 at the other end of the inner arm 40 described above. A pedestal 56 is attached to the rotating arm 22 via a pair of support tools 54. The pedestal 56 is provided with a pair of chucks 58, and the cutting tool 24 is fixed to the pedestal 56 by the chucks 58.
[0016]
Next, the movement state of the distal end portion of the cutting tool 24 accompanying the turning operation of the turning arm 22 will be described with reference to FIGS. First, it is assumed that the rotating shaft 20 is rotated about 60 degrees rightward from the state shown in FIG. Then, as shown in FIG. 3A, the inner arm 40 that rotates integrally with the rotary shaft 20 also rotates about 60 degrees in the right direction. Then, the pin 50 engaged with the long groove 42 at the other end of the inner arm 40 moves along the guide groove 52 while sliding with respect to the long groove 42. Then, as shown in FIG. 3 (2), the other end of the rotating arm 22 to which the pin 50 is fixed moves simultaneously, and the rotating arm 22 rotates about 60 degrees rightward with the rotating shaft 20 as a fulcrum. To do. At this time, since the distance of each point of the guide groove 52 with respect to the rotation shaft 20 changes, the rotation arm 22 rotates around the rotation shaft 20 while the long groove 44 slides with respect to the rotation shaft 20. As a result, the cutting tool 24 fixed to the rotating arm 22 also rotates about 60 degrees to the right.
[0017]
FIG. 4 shows the movement of the tip of the cutting tool 24 when the pin 50 moves along the guide groove 52 by the rotation of the rotation shaft. That is, when the pin 50 moves in the order ab-c-d-e-f-g, the tip of the cutting tool 24 is a'-b'-c'-d'-e'-f'-g '. Move in the order. In other words, the shape of the guide groove 52 is determined in advance so that the tip of the cutting tool 24 always moves in close proximity to the inner surface of the recess 12A of the deck plate 12. The method for determining the shape of the guide groove 52 is simple. That is, the distance L between the pin 50 fixed to the rotating arm 22 and the tip of the cutting tool 24 is constant, and the rotating arm 22 rotates about the rotating shaft 20 as a fulcrum. Therefore, a straight line connecting each point on the inner surface of the recess 12A of the deck plate 12 and the center of the rotary shaft 20 is drawn, and a point on the straight line slightly larger than the interval L from each point on the inner surface of the recess 12A Determine as position. Then, each point of the guide groove 52 is determined for each point on the inner surface of the recess 12A, and the shape of the guide groove 52 is determined by continuing these points.
[0018]
Next, a method of using the deck plate cutting apparatus 10 having the above configuration will be described. As shown in FIG. 5, a work table 60 is disposed immediately below the deck plate 12 forming the ceiling surface, and a worker 62 riding on the work table 60 cuts the deck plate at a position where the inner surface of the recess 12A is to be cut. The apparatus 10 is mounted. The deck plate cutting device 10 can be manufactured to be as light as about 5 kg and can be easily lifted by one worker 62 alone. Further, as described above, the magnet 29 is attached to the main body portion 18 of the deck plate cutting apparatus 10. For this reason, when the deck plate cutting device 10 is brought close to the recess 12A of the deck plate 12, the main body 18 is magnetically attached to the recess 12A of the deck plate 12 by the magnetic force of the magnet 29, and there is no backlash with respect to the recess 12A. Positioned in the state. In FIG. 5, reference numeral 64 denotes a power cable for the motor 36, and reference numeral 66 denotes a hand operation switch of the deck plate cutting apparatus 10. Reference numeral 68 denotes a gas, plasma, and compressed air supply line when the cutting tool 24 is a gas cutting or plasma cutting torch, and a power cable when the cutting tool 24 is a cutting tool.
[0019]
Next, the cutting tool 24 is cut after moving the tip of the cutting tool 24 to a position on the inner surface of the recess 12A to be cut. That is, when the part to be cut is the entire inner surface of the recess 12A, the hand operation switch 66 is operated to drive the motor 36, and the tip of the cutting tool 24 is aligned with the point a 'shown in FIG. Next, the hand operation switch 66 is operated, and the cutting with the cutting tool 24 is started while rotating the rotating shaft 20 counterclockwise. Then, the rotational force of the rotary shaft 20 is transmitted in the order of the inner arm 40, the pin 50, and the rotating arm 22, the cutting tool 24 integrated with the rotating arm 22 is also rotated counterclockwise, and the tip of the cutting tool 24 is a'-b. It moves in the order of '-c'-d'-e'-f'-g' to cut the inner surface of the recess 12A. In this cutting process, the distal end portion of the cutting tool 24 moves in a direction substantially perpendicular to and close to the inner surface of the recess 12A, so that the recess 12A can be cut well. When the tip of the cutting tool 24 reaches g ′, a limiter (not shown) is activated, and the rotation of the rotary shaft 20 and the cutting by the cutting tool 24 are stopped. Contrary to the above, the tip of the cutting tool 24 is aligned with the point g ′ shown in FIG. 4, the rotating shaft 20 is rotated to the right, and the tip of the cutting tool 24 is moved to g′−f′−e′−. You may make it cut | disconnect, moving in order of d'-c'-b'-a '.
[0020]
When the portion to be cut is, for example, the right half of the inner surface of the recess 12A shown in FIG. 4, the tip of the cutting tool 24 is aligned with the point d ′ shown in FIG. Next, the hand operation switch 66 is operated to start cutting with the cutting tool 24 while rotating the rotary shaft 20 to the right. Then, the tip of the cutting tool 24 moves in the order of d′-c′-b′-a ′, cuts the right half of the recess 12A, and when the tip of the cutting tool 24 reaches a ′, a limiter (not shown). The rotation of the rotary shaft 20 and the cutting by the cutting tool 24 are stopped. Similarly, when the part to be cut is, for example, the left half of the inner surface of the recess 12A, the tip of the cutting tool 24 is aligned with the point d ', and the tip of the cutting tool 24 is d'-e'-f. Move in the order of '-g' to cut.
[0021]
As described above, according to the deck plate cutting apparatus 10 according to this embodiment, even in an upward operation on a high ceiling, an arbitrary portion of the deck plate 12 that is desired to be cut in the recess 12A can be cut easily with a simple operation. can do. The deck plate cutting device 10 is a dedicated device for cutting the recess 12A of the deck plate 12 along the inner cross section. Therefore, even when the convex portion 12B of the deck plate 12 is cut or when the concave portion 12A of the deck plate 12 is cut, the cutting line perpendicular to the paper surface of FIG. The cutting device is used. However, since such a cutting line that is not targeted by the deck plate cutting device 10 can be cut relatively simply, it can be easily handled even by using an existing cutting device. Although the case where the concave portion 12A of the deck plate 12 forming the ceiling surface is cut has been described with reference to FIG. 5, the deck plate cutting device 10 according to this embodiment is not limited to such an application. For example, the deck plate cutting device 10 can be used when a part of the concave portion is previously cut at the ground position with respect to the deck plate before the ceiling surface is formed. The deck plate cutting apparatus 10 can also be used when the deck plate is used as a part of a building side wall other than the ceiling surface, for example.
[0022]
There are various types of deck plates on the market with different sizes and shapes. In the deck plate cutting apparatus 10 according to this embodiment, the shape of the side plates 26 and 28 and the shape of the guide groove 52 correspond to the deck plate 12 having specific unevenness dimensions and shapes. For this reason, it is necessary to separately prepare other deck plates having different concavo-convex dimensions and shapes in which the side plate, the shape, and the shape of the guide groove are adapted to the concavo-convex dimensions and shapes. However, for example, at the construction site of one nuclear power plant, the deck plate for a concrete building is usually used with the same size and shape. For this reason, the use opportunity of the kind of deck plate cutting device 10 according to this embodiment reaches several hundreds or thousands at the construction site of one nuclear power plant, so there is no practical inconvenience on the left.
[0023]
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a side sectional view of the deck plate cutting apparatus 10A of the second embodiment. 6, elements having the same reference numerals as those in FIG. 2 have the same structure and function as those in the first embodiment, and a description thereof will be omitted. In the present embodiment, one end of the pin 70 is fixed to the other end of the inner arm 40A. Further, the side plate 28A has an arc groove 72 centered on the rotation shaft 20. The other end of the pin 70 penetrates the arc groove 72 and is slidably engaged with a long groove 44A provided in the rotating arm 22A. A pin 50A is fixed to the other end of the rotating arm 22A, and this pin 50A is engaged with a guide groove 52 provided in the side plate 28A.
[0024]
In the above configuration, when the rotary shaft 20 is rotated as shown in FIG. 7A, the inner arm 40A that rotates integrally with the rotary shaft 20 also rotates in the same manner, and is fixed to the other end of the inner arm 40A. 70 moves along the arc groove 72. Then, as shown in FIG. 7B, the rotating arm 22 </ b> A rotates around the rotating shaft 20 as the long groove 44 </ b> A of the rotating arm 22 </ b> A slides with respect to the pin 70. At this time, since the distance of each point of the guide groove 52 with respect to the rotating shaft 20 changes, the long arm 44A of the rotating arm 22A guided via the pin 50A also slides with respect to the rotating shaft 20.
[0025]
According to the deck plate cutting apparatus 10A of the second embodiment, the rotary arm 22A exhibits substantially the same movement as the rotary arm 22 described in the first embodiment, and therefore the cutting mounted on the rotary arm 22A. The tip of the tool 24 can be moved in close proximity to the inner surface of the recess 12A of the deck plate 12.
[0026]
FIG. 8 is a side sectional view of the deck plate cutting apparatus 10B of the third embodiment. 8 having the same reference numerals as those in FIG. 2 have the same structure and function as those in the first embodiment, and the description thereof is omitted. Compared with the first embodiment, the third embodiment omits a driving mechanism such as a motor and a rotating shaft, and simplifies the configuration. That is, the support shaft 20B is fixed to the side plate 28B, the support shaft 20B is slidably engaged with the long groove 44 provided in the rotation arm 22B, and the rotation arm 22B slides with respect to the support shaft 20B. It is possible to rotate about the support shaft 20B as a fulcrum. The pin 50B fixed to the other end of the rotating arm 22B is guided to the guide groove as described in the first embodiment.
[0027]
According to the deck plate cutting device 10B of the third embodiment, when an operator grasps the handle portion 24A of the cutting tool 24 and swings it back and forth, the rotating arm 22B integrated with the cutting tool 24 is attached to the support shaft 20B. While rotating with respect to the support shaft 20B, the support shaft 20B is rotated as a fulcrum. At this time, the guide groove guides the rotating arm 22B through the pin 50B so that the tip of the cutting tool 24 always moves in close proximity to the inner surface of the recess 12A. For this reason, the cutting operation by the operator of the recess 12A can be performed easily and stably. Thus, the deck plate cutting apparatus 10B of the third embodiment is useful for cutting by manual work.
[0028]
【The invention's effect】
According to the present invention, the turning operation of the turning arm to which the cutting tool is integrally attached is guided by the guide groove so that the tip of the cutting tool always moves in close proximity to the inner surface of the concave portion of the deck plate . For this reason, the front-end | tip part of a cutting tool can be moved substantially perpendicularly with respect to the inner surface of the recessed part of a deck plate, and it can move closely, and the recessed part of a deck plate can be cut | disconnected skillfully. Moreover, since it is compact and lightweight, it is easy to handle for field work. Further, since the support shaft serving as a pivot for pivoting the pivot arm is used as a rotation shaft, and the pivot arm is rotated by the rotational force of the rotation shaft, the drive mechanism can be simplified. Further, the configuration in which the drive mechanism is omitted is useful for manual cutting.
[Brief description of the drawings]
FIG. 1 is a front view of a deck plate cutting device 10 according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is an explanatory diagram for explaining a turning operation of a turning arm 22;
FIG. 4 is an explanatory diagram for explaining a movement state of a distal end portion of a cutting tool 24. FIG.
FIG. 5 is an explanatory diagram showing a usage state of the deck plate cutting device 10;
FIG. 6 is a side sectional view of a deck plate cutting device 10A according to a second embodiment of the present invention.
FIG. 7 is an explanatory diagram for explaining a turning operation of a turning arm 22A.
FIG. 8 is a side sectional view of a deck plate cutting device 10A according to a third embodiment of the present invention.
FIG. 9 is a front sectional view showing a ceiling structure using a deck plate according to the prior art.
FIG. 10 is a perspective view showing a cutting state of a deck plate according to the prior art.
[Explanation of symbols]
10, 10A, 10B ......... Deck plate cutting device, 12 ......... Deck plate, 12A ......... Concavity, 12B ......... Convex, 14 ......... Concrete, 16 ......... Embedded hardware, 18 ... ... Main body, 20, 20A ......... Rotating shaft, 20B ......... Support shaft, 22, 22A, 22B ......... Rotating arm, 24 ......... Cutting tool, 26, 28, 28A, 28B ......... Side plate 30 ......... Connecting rod, 36 ......... Motor, 38 ......... Reduction gear mechanism, 40, 40A ......... Inner arm, 42,44,44A ......... Long groove, 50, 50A, 50B ......... Pin , 52 ... Guidance groove, 66 ... Hand control switch.

Claims (3)

A main body mounted in the concave portion of the deck plate, a support shaft provided on the main body, and a rotary arm that is slidable with respect to the support shaft and is rotatably engaged with the support shaft as a fulcrum; The rotating tool is engaged with a cutting tool attached to the rotating arm and a pin provided on the rotating arm, and the tip of the cutting tool is moved close to the inner surface of the concave portion of the deck plate. A deck plate cutting device comprising a guide groove for guiding the rotational movement of the arm. The deck plate cutting device according to claim 1, wherein the support shaft is a rotation shaft, and the rotation arm is rotated by a rotation force of the rotation shaft. The deck plate cutting apparatus according to claim 1 or 2, wherein the main body is magnetically attached to the deck plate by a magnet attached to the main body.

Images