JPH079434A - Concrete pile cutting device - Google Patents

Abstract

PURPOSE:To provide a concrete pile cutting device simply operated by any person, enhanced in working efficiency and having a rotary cutting blade extended in its life to a large extent. CONSTITUTION:A concrete pile cutting device has the moving stand 11 moving around the periphery of a hollow concrete pipe P provided almost vertically and the cutter main body 40 provided on the stand 11 and the cutter main body 40 consists of a motor M, the rotary cutting blade 41 attached to the drive shaft of the motor M and the case 42 having the motor M fixed thereto and covering the rotary cutting blade. A protruding member is provided to the case 42 on one side thereof and one end of a link member is attached to the moving stand 11 in a freely revolvable manner and the protruding member is attached to the other end of the link member in a freely revolvable maner and a pressure contact means bringing the rotary cutting blade 41 of the cutter main body 40 into contact with the concrete pile P is provided on the moving stand 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for cutting a surplus portion of a concrete pile which is placed substantially vertically in the ground and which remains on the ground.

[0002]

2. Description of the Related Art Conventionally, as a concrete pile cutting device, there has been a device described in Japanese Utility Model Laid-Open No. 3-59807. The cutting device according to this publication has an annular guide rail (2) attached to a concrete pile (P), a movable base (3) slidably mounted on the guide rail (2), and a movable base (3). And a cutting machine body (5) rotatably attached to the cutting machine body. This cutting machine body (5) fixes the motor (M), the rotary cutting blade (7) attached to the drive shaft of the motor (M), the motor (M), and covers the rotary cutting blade (7). The case (8) is provided with a projecting member (8b) on one side of the case (8). This protruding member (8b) is
It is rotatably attached to the movable table (3). This concrete pile cutting device drives a motor (M) to rotate a rotary cutting blade (7) and then manually pushes the rotary cutting blade (7) against the concrete pile (P) to cut to a predetermined depth. To do. By performing this cutting operation while moving the movable table (3) along the guide rail (2), the rotary cutting blade (7) cuts the periphery of the concrete pile (P) in an annular shape.

[0003]

However, in the concrete pile cutting device, the rotary cutting blade (7) bites into the concrete pile (P) around the protruding member (8b) (see FIG. 12). The contact portion of the rotary cutting blade (7) with respect to the concrete pile (P) will perform cutting. The more this bite, the more
The contact area of the contact portion with the concrete pile (P) is increased, and the cutting resistance is increased. Since the cutting operation is performed manually, it takes a considerable amount of labor to keep the rotary cutting blade (7) pressed against the concrete pile (P) against this cutting resistance. Push and hold to force the rotary cutting blade (7)
Wear becomes severe and clogging due to heating occurs,
Furthermore, there is a risk that the rotation will stop while biting into it, and it will not be able to be removed and will be damaged. Therefore, when the operator perceives that the cutting resistance has significantly increased, the operator cannot feel the fact that the cutting resistance can be cut and the cutting cannot be performed. By moving along the rail (2), the turning center of the rotary cutting blade (7) is slightly displaced, the cutting position is changed, and the work is restarted. By doing so, the contact area of the contact portion is reduced and the cutting resistance is reduced, so that the work becomes easier. However, this cutting work is performed repeatedly by human power while sensing the change in cutting resistance, and the circumference of the concrete pile (P) is cut into an annular shape, which requires considerable labor and many years of experience. There was a problem that not everyone could do it easily, but it required skill. In addition, there is a problem in that the vibration and shock during cutting are received by hand, which causes a health hazard due to diseases such as white wax. Furthermore, due to the cutting resistance, the cutting depth obtained by one cutting is not that much, and the work is repeated many times, so it takes too much time to cut one concrete pile, and the work efficiency is poor. There was also a problem. On the other hand, if the work of pressing the rotary cutting blade (7) against the concrete pile (P) is forcibly carried out by a hydraulic cylinder or the like, the above-mentioned adverse effects are eliminated, but a change in cutting resistance or the like cannot be sensed. Similar to the above-mentioned forcible pressing, there is a problem that the rotary cutting blade generates high heat and causes clogging or damage, which extremely shortens the life of the rotary cutting blade. This problem was rather serious, especially since concrete piles were expensive.

The present invention has been devised in view of the above problems, and anyone can work easily and work efficiency is improved.
An object of the present invention is to provide a concrete pile cutting device in which the life of the rotary cutting blade is significantly extended.

[0005]

The concrete pile cutting device according to the present invention has the following constitution in order to achieve the above object. (A) A movable base that moves in an annular shape along the circumference of a hollow concrete pile that is erected substantially vertically, and a cutting machine body provided on the movable base. (B) The cutting machine body includes a motor, a rotary cutting blade attached to the drive shaft of the motor, and a case that fixes the motor and covers the rotary cutting blade. A protruding member is provided on one side of the case. That (C) One end of the link member is rotatably attached to the moving base, and the above-mentioned protruding member is rotatably attached to the other end of the link member. (2) The moving table must be provided with a pressure contact means for pressing the rotary cutting blade of the cutter body against the concrete pile. Further, the pressure contact means is composed of a fluid cylinder rotatably attached to the moving base and a forced rotation plate, and the disk body fixedly attached to the protruding member, and the disk body. One end may be provided on one side, and the other end may extend from the disc body approximately half way to the other side and may be rotatably attached to the tip of the cylinder rod of the fluid cylinder. Furthermore, the moving base may be configured to be slidably mounted on an annular guide rail that is detachably mounted on the circumference of a hollow concrete pile that is erected substantially vertically. Is configured to be movable on an installation stand installed on the ground around a hollow concrete pile that is erected substantially vertically, and guide members that surround the concrete pile are provided on both sides of the movement stand. The guide member may be provided with a guide roller rolling on the peripheral surface of the concrete pile.

[0006]

The concrete pile cutting device according to the present invention is
Since the rotary cutting blade is rotated by driving the motor by the above-mentioned configuration and the rotary cutting blade is brought into pressure contact with the concrete pile by the pressure contact means, the rotary cutting blade horizontally moves the concrete pile while the turning center of the rotary cutting blade moves. Disconnect.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the concrete pile cutting apparatus according to the present invention will be described below with reference to the drawings. The overall outline will be described with reference to FIG. Reference numeral 1 is an annular guide rail attached to the concrete pile P via bolts B. Substantially U-shaped sliding grooves 2 and 3 are formed above and below the guide rail 1. Reference numeral 11 denotes a movable table which is movably provided on the guide rail 1. A cutting machine body 40 is rotatably provided on the movable table 11 via the link member 30. Reference numeral 60 denotes a pressure contact means provided on the side surface of the movable table 11.

Further, a specific structure will be described with reference to FIG. The moving table 11 has a sliding member 12 having a substantially U shape. At the tips of the vertically protruding portions 13 and 14 of the sliding member 12, there are rollers 15 that roll on the side surfaces of the sliding grooves 2 and 3.
Is rotatably provided. Further, guide members 16 are fixedly provided on both sides of the upper protruding portion 13, and guide rollers 17, 17 rolling on the bottom surface of the upper sliding groove 2 are freely rotatable on the lower surface of the guide member 16. It is provided in. Further, between the rollers 15 of the lower protruding portion 14, a pair of guide rollers 18, 18 rolling on the upper surface of the lower sliding groove 3 are rotatably provided.

An L-shaped locking portion 20 is integrally formed on the rear surface 19 of the moving base 11, and a mounting base 21 is fixedly mounted on the locking portion 20. The mounting base 21 includes a mounting portion 22 that abuts on the rear surface 19 of the sliding member 12 and a support base 23 that integrally projects from the rear portion of the mounting portion 22.
A support member 28 that supports the horizontal bottom surface of the cutting machine body 40 is attached to the front portion of the attachment portion 22.

A central shaft 25 of an adjuster 24 is rotatably attached to the tip of the support base 23. This adjuster 2
4 is a holding portion 26 that slidably holds an adjustment shaft 55 described later.
The holding portion 26 is screwed with a tightening bolt 27 for fixing an adjustment shaft 55 described later at a predetermined position. A support hole 29 is bored from the upper surface to the lower surface at a substantially central portion of the support base 23. In the support hole 29, a first support shaft 31 provided on a lower surface of a front portion of a link member 30 is provided. Is rotatably supported. A second support shaft 32 is provided on the upper surface of the rear portion of the link member 30 so as to project therefrom. Also, the support base 2
3, stoppers 23a and 23b for restricting the swing range of the link member 30 are provided.

A cutting machine body 40 is composed of an air motor M, a rotary cutting blade 41 attached to the rotary shaft of the air motor M, and a protective case 42 for attaching these. A compressed air intake portion 39 is provided on a side portion of the air motor M, and the compressed air intake portion 39 is provided with a flow dividing block 38. This shunt block 38
Has an opening for sending compressed air into the air motor M, and an opening for sending compressed air to the regulator 86 described later via the hose 37. A main valve 36 is provided above the flow dividing block 38, and the main valve 36 is
It is connected to a compressor (not shown) via a hose 35.

A bearing pipe 44 is attached to a side portion of the protective case 42 via a rib 43. The bearing pipe 44 is rotatably attached to the second support shaft 32 of the link member 30. On the upper surface of the bearing pipe 44,
A plurality of screw holes 45 ... Are provided. On the upper surface of the bearing pipe 44, an arm plate 47 having a rear portion with holes 46, ... Further, a fixed plate 49 having holes 48, which are provided so as to face the holes 46, is superposed on the arm plate 47. As described above, the bolt 50 is inserted into the holes 48 and 46 and screwed into the screw hole 45 in a state where the bearing pipe 44, the arm plate 47, and the fixing plate 49 are overlapped with each other.
7. A fixing plate 49 is fixed. A substantially U-shaped handle 51 is fixed to the upper surface of the fixed plate 49. Reference numeral 52 denotes a bearing portion to which the tip of the adjustment shaft 55 is rotatably attached by a pin 53. The adjusting shaft 55 is provided with a collar 33 which is slidable on the adjusting shaft 55 in the axial direction, and the collar 33 is provided with a screw hole 33a into which a thumbscrew 34 is screwed. The fixing plate 49 is fixed to the upper surface of the protective case 42 at a position substantially opposite to the bearing pipe 44 via a bolt.

Reference numeral 60 denotes a pressure contact means having a lateral member 62 for supporting the air-cylinder 70. This lateral member 6
2 is fixed by abutting a mounting plate 63 provided at the base end thereof on the side surface of the support base 23 and screwing a bolt 61 to the mounting plate 63 and the support base 23. A vertical member 65 is attached to the tip of the horizontal member 62 at right angles to the bolt 6 so as to be orthogonal thereto.
It is fixed by 6. A bearing portion 67 is fixed to the upper portion of the vertical member 65, and a rear portion of an air-cylinder 70 is rotatably attached to the bearing portion 67 by a pin 71. At the tip of the cylinder rod 72 of the air-cylinder 70, a support block 75 that rotatably supports the tip portion 47a of the arm plate 47 via a pin 73 is provided.

Reference numeral 80 denotes a handle, which is a mounting pipe 81.
have. This mounting pipe 81 has a lower end 82.
The mounting plate 83 provided on the above is brought into contact with the side surface of the lateral member 62, and is fixed by screwing a bolt (not shown) onto the mounting plate 83 and the lateral member 62. A control plate 85 is fixed to the middle portion of the mounting pipe 81. The control plate 85 is provided with a regulator 86 that adjusts the flow rate of the compressed air sent through the hose 37, and a switching valve 89 that is connected to the regulator 86 through the hose 87. . This switching valve 89 always has a lower opening 8
9a is opened, and the upper opening 89b is opened by pressing the changeover switch 90 provided on the upper side. The lower opening 89a and the opening 70a in the direction in which the cylinder rod 72 of the air cylinder 70 is pulled back are connected by a hose 91. Also, the upper opening 89b,
A hose 92 connects the opening 70b in the direction in which the cylinder rod 72 of the air cylinder 70 is pushed out.
A pressing piece 95 for pressing the changeover switch 90 is rotatably provided on the upper portion of the control plate 85 so as to be urged in the anti-pressing direction by the elastic spring 96.
The pressing piece 95 is connected to a lever 97 provided on the upper portion of the mounting pipe 81 via a wire 98, and when the lever 97 is operated, the pressing piece 95 is rotated in the anti-elastic direction of the elastic spring 96 via the wire 98. The changeover switch 90 is pushed by moving it.

Reference numeral 5 denotes a handle, which has a mounting pipe 6 which is complicatedly bent. The mounting pipe 6 is fixed by bringing a mounting plate 8 provided at a lower end 7 of the mounting pipe 6 into contact with a rear surface 19 of the moving base 11 and screwing a bolt (not shown) to the mounting plate 8 and the moving base 11.

Next, the method of use will be described. The guide rail 1 is fixed to the concrete pile P via the bolt B. In the sliding grooves 2 and 3 of the fixed guide rail 1,
The rollers 15 and 15 and the guide roller 17 of the movable table 11,
17 is attached, and the movable table 11 is slidably mounted on the guide rail 1. Next, the first support shaft 31 of the link member 30 is inserted into the support hole 29 formed in the mounting base 21 of the movable table 11, and the second support shaft 32 of the link member 30 is inserted into the pipe of the cutting machine body 40. 44 is rotatably attached. The tip end of the adjustment shaft 55 is rotatably attached to the bearing portion 52 provided on the side portion of the protective case 42, and the rear portion is the holding portion 2 of the adjuster 24.
6 and the collar 33 is slidably attached.

In this state, compressed air is sent from the compressor (not shown) into the air motor M through the hose 35, the main valve 36 and the flow dividing block 38, and when the air motor M is driven, the rotary cutting blade 41 rotates in the direction of arrow X. (See Figure 3). In addition, compressed air is divided into
8, hose 37, regulator 86, hose 87, switching valve 89, lower opening 89a, hose 91, opening 7
It flows into the air cylinder 70 via 0a and urges the cylinder rod 72 in the direction to pull it back.

When the lever 97 is operated, the pressing piece 95 is rotated in the anti-elastic direction of the elastic spring 96 via the wire 98 to press the changeover switch 90. The outflow opening of the switching valve 89 is switched to the upper opening 89b, flows into the air cylinder 70 through the upper opening 89b, the hose 92, and the opening 70b, and urges the cylinder rod 72 in the pushing direction. The tip of the arm plate 47 is pushed out by the protrusion of the cylinder rod 72. The link member 30 swings until it abuts the stopper piece 23a, and the second support shaft 32, which is the turning center of the cutting machine body 40, is pushed forward.
From the state in which the second support shaft 32 is pushed out forward, the cutting rod body 40 is further pushed by the protrusion of the cylinder rod 72.
Swivels around the second support shaft 32, and the rotary cutting blade 41
Starts to cut the concrete pile P horizontally (see FIG. 4). Further, due to the protrusion of the cylinder rod 72, the rotary cutting blade 41 revolves around the second support shaft 32 and cuts deeply. At this time, the second support shaft 32 receives a torsional moment due to the protrusion of the cylinder rod 72, and as a result, the second support shaft 32 contacts the stopper piece 23b in the turning direction of the rotary cutting blade 41 about the first support shaft 31. It will move. When the lever 97 is released, the pressing piece 9
5 is rotated in the elastic direction by the elasticity of the elastic spring 96, and the pressing of the changeover switch 90 is released. The outflow opening of the switching valve 89 is switched to the lower opening 89a, compressed air flows into the air cylinder 70 through the lower opening 89a, the hose 91, and the opening 70a, and the cylinder rod 7
Pull back 2. By pulling back the cylinder rod 72,
The tip of the plate 47 returns to its original position, the rotary cutting blade 41 rotates about the second support shaft 32, and separates from the concrete pile P (see FIG. 3). By the pulling back of the cylinder rod 72, the second support shaft 32 remains in contact with the stopper piece 23b. In this way, lever 97
By this operation, the cutting machine body 40 can be cut while moving the turning center, and the load on the rotary cutting blade 41 can be reduced. The cutting depth of the concrete pile P is adjusted by adjusting the collar 33 by tightening the thumbscrew 34.
It can be kept constant by fixing it in place.

This will be described in more detail with reference to FIG. O
Is the axis of the first support shaft 31 of the link member 30, and P1
~ P5 represents the axis of movement of the second support shaft 32. O1-
O5 represents the moving center of the rotary cutting blade 41. As described above, the arm plate 47 is caused by the protrusion of the cylinder rod 72.
The tip portion of the stopper member 2 is extruded and the link member 30 becomes a stopper piece 2.
It swings from the state of being in contact with 3b until it is in contact with the stopper piece 23a, and the axis of the second support shaft 32 moves from P1 to P2. The center of the rotary cutting blade 41 also moves from O1 to O2 and is pressed against the concrete pile P. This second
From the state P2 in which the support shaft 32 is pushed forward, the rotary cutting blade 41 swivels around the second support shaft 32 by the projection of the cylinder rod 72, and starts to cut the concrete pile P in the horizontal direction. . Cylinder rod 7
Due to the protrusion of 2, the rotary cutting blade 41 swivels around the second support shaft 32 and cuts deeply.
The support shaft 32 receives a torsional moment due to the protrusion of the cylinder rod 72, moves from P2 to P3 about the first support shaft 31, and the center of the rotary cutting blade 41 also moves from O2 to O3.
Move to. In this way, due to the protrusion of the cylinder rod 72, the axis of the second support shaft 32 causes the axis of the second support shaft 32 to contact P1 to P2, P2 to P3, P3 to P4, and P4 with the link member 30 in contact with the stopper piece 23b. From link member 30
Moves P5 (P1) in a state of being in contact with the stopper piece 23b. In accordance with this, the center of the rotary cutting blade 41 also moves from O1 to O2, O2 to O3, O3 to O4, and O4 to O5, and cuts the concrete pile P in the horizontal direction. In this way, since the center of the rotary cutting blade 41 moves in the turning direction, the contact area of the rotary cutting blade 41 with respect to the concrete pile P is less than half of the conventional one, and the contact resistance is reduced. Therefore, the life of the rotary cutting blade 41 is significantly extended. The center of the rotary cutting blade 41 is O5
When the cylinder rod 72 is pulled back at the time of, the link member 30 does not move while being in contact with the stopper piece 23b, and the center of the rotary cutting blade 41 moves from O5 to O1.

As described above, by operating the lever 97, the cutting machine main body 40 is swung to horizontally cut the concrete pile P, and after cutting to a predetermined depth, the operation of the lever 97 is released to cut the cutting machine. The main body 40 is returned to the original position, the movable table 11 is moved from the handles 80 and 5 along the guide rail 1, and the lever 97 is operated in the same manner as above to perform the concrete operation.
The top pile P will be cut in a ring shape.

In the above embodiment, the arm plate 47 is formed in a straight line shape, but as shown in FIG. 6, the arm plate 47 should be formed in a substantially letter shape, and the second support shaft 32 of the link member 30 being cut. Movement becomes smooth. That is, the arm plate 100 (forced rotation plate)
To the bearing pipe 44 (projecting member) with a bolt 50
The disc body 101 fixedly attached by means of one end 103 is provided on one side of the disc body 101, and the other end 104 extends approximately half the circumference of the disc body 101 to the other side, and the air cylinder 70 The arm 102 is rotatably attached to the tip of the cylinder rod 72. This arm 102
When is pushed out to the cylinder rod 72, this pushing force is applied to one side of the disc body 101 to turn the rotary cutting blade 41 and cut the second support shaft 32 which is the turning center of the rotary cutting blade 41. Will be moved in the direction.

A concrete pile cutting apparatus to which the other embodiment is applied will be described with reference to the drawings. 11
1 is a concrete pile cutting device, which is an installation table 11
2 and a cutting machine 113. Further, the cutting machine 113 includes a moving table 120 and a cutting machine body 151 attached to the moving table 120. The installation table 112 is shown in FIG.
As shown in FIG. 10, a split body 116 and a split body 1 are formed in a disk shape having a through hole 123 for inserting a concrete pile in the center and are divided into two from the center.
It is composed of 18.

The moving table 120 is formed in a semi-circular plate shape, both ends thereof are linearly cut, and a semi-circular concave portion 127 is formed in the center of the side edge. The recess 12 of the moving table 120
Mounting plates 130 and 131 are fixed to the 7 side, and guide rollers 128 and 129 are rotatably mounted to the mounting plates 130 and 131 (see FIG. 10). In addition, at a predetermined position on the lower surface of the movable table 120, the mounting surface 1 of the installation table 112 is placed.
A plurality of moving rollers for moving on 21 are provided. Further, the fixed shaft 14 is provided on one side of the upper surface of the movable table 120.
7 is provided. A hole 141 provided at the front end of the link member 140 is rotatably attached to the fixed shaft 147. On the rear upper surface of the link member 140,
The second support shaft 142 is provided so as to project. Also, the moving table 120
A pair of stoppers for restricting the swing range of the link member 140 are provided on the.

The cutting machine body 151 includes an air motor M,
Cutting blade 15 attached to the rotary shaft of the air motor
2 and a protective case 153 to which these are attached. A protruding plate 162 having a hole 161 for attaching to the second support shaft 142 is fixed to one side surface of the protective case 153. The protruding plate 162 includes
The arm plate 100 (forced rotation plate) described above is attached. The other end 104 of the arm 102 of this arm plate 100
Is rotatably attached to a cylinder rod 72 of an air-cylinder 70 provided on the moving table 120. Further, a stopper 163 for restricting the rotation of the cutting machine body 151 is formed on the outer side of the movable table 120.

Substantially U-shaped bearings 165, 165 are provided at both ends of the movable base 120. The bearings 165, 1 are provided.
The guide portions 171 and 172 of the adjusting member 105 formed in a substantially U shape are attached to the pin 65 by pins 173 and 173. In addition, the guide portions 171,1
The holding portion 174 that holds both rear ends of the 72 is provided with the slanted portions 1 on both sides.
75, and the moving roller 13 is provided on the outer side of the slanted portion 175.
A triangular protruding plate 178 to which 6, 136 are attached is provided. Further, inside the slanted portion 175, mounting plates 179 and 180 are provided at positions corresponding to the mounting plates 130 and 131 of the movable table 120.
Guide rollers 183, 184 are rotatably attached to the lower portions of 9, 180.

This usage method will be described. Installation stand 1
The 12 divided bodies 116 and 118 are integrated by sandwiching the concrete pile. Next, the movable table 120 is mounted on the mounting surface 121 of the installation table 112 so that the guide rollers 128 and 129 contact the peripheral surface of the concrete pile. Further, the guide portions 171, 172 of the adjusting member 105
One of the plurality of holes 169, 170 formed in the above is inserted into the holes of the bearings 165, 165, the pins 173, 173 are inserted, and the guide rollers 183, 184 of the adjusting member 105 are brought into contact with the peripheral surface of the concrete pile. The adjustment member 105 is fixed to the moving table 120. Then, the concrete pile P can be cut in the same manner as described above while moving the movable table 120 along the concrete pile P.

[0027]

The concrete pile cutting apparatus according to the present invention cuts the concrete pile P in an annular shape while moving the rotary cutting blade around the turning center, so that the load on the rotary cutting blade is reduced and the expensive rotary cutting is performed. This has the effect of significantly extending the life of the cutting blade.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of FIG.

FIG. 3 is a use explanatory diagram.

FIG. 4 is a use explanatory diagram.

FIG. 5 is an explanatory diagram of use.

FIG. 6 is an exploded perspective view of a main part of another embodiment.

FIG. 7 is an explanatory diagram of use in FIG.

FIG. 8 is an explanatory diagram of movement.

FIG. 9 is an assembled perspective view of another embodiment.

FIG. 10 is an exploded perspective view of a main part of FIG.

FIG. 11 is a plan view of FIG.

FIG. 12 is a diagram showing a conventional technique.

[Explanation of symbols]

 P Concrete pile M Air motor 1 Guide rail 11 Moving base 21 Mounting base 23 Supporting base 28 Supporting member 29 Supporting hole 30 Linking member 31 First supporting shaft 32 Second supporting shaft 40 Cutting machine body 41 Rotating cutting blade 42 Protective case 44 Bearing Pipe 47 Arm Plate (Forced Rotation Plate) 47a Tip 60 Pressure Contact Means 70 Air-Cylinder (Fluid Cylinder) 72 Cylinder Rod 100 Arm Plate (Forced Rotation Plate) 102 Arm 105 Adjusting Member (Guide Member) 111 Concrete pile cutting device 112 Installation table 113 Cutting machine 120 Moving table 128 Guide roller 129 Guide roller 140 Link member 142 Second support shaft 151 Cutting machine body 152 Rotating cutting blade 153 Protective case 162 Projection plate 183 Guide roller 184 Guide roller

Claims (4)

[Claims] 1. A concrete pile cutting device having the following requirements. (A) A movable base that moves in an annular shape along the circumference of a hollow concrete pile that is erected substantially vertically, and a cutting machine body provided on the movable base. (B) The cutting machine body includes a motor, a rotary cutting blade attached to the drive shaft of the motor, and a case that fixes the motor and covers the rotary cutting blade. A protruding member is provided on one side of the case. That (C) One end of the link member is rotatably attached to the moving base, and the above-mentioned protruding member is rotatably attached to the other end of the link member. (2) The moving table must be provided with a pressure contact means for pressing the rotary cutting blade of the cutter body against the concrete pile. 2. The concrete pile cutting device according to claim 1, wherein the concrete pile cutting device has the following requirements. (A) The pressure contact means is composed of a fluid cylinder rotatably attached to the movable table and a forced rotation plate. (B) The forced rotation plate has a disc body fixedly attached to the projecting member and one end provided on one side of the disc body, and the other end extends substantially half around the disc body to the other side. It consists of an arm that extends and is rotatably attached to the tip of the cylinder rod of the fluid cylinder. 3. The moving table is configured to be slidably mounted on an annular guide rail that is detachably mounted on the circumference of a hollow concrete pile that is erected substantially vertically. The concrete pile cutting device described. 4. The concrete pile cutting device according to claim 2, wherein the following requirements are met. (B) The movable table is configured to be movable on the installation table installed on the ground around the hollow concrete piles that are erected substantially vertically. (B) Guide members that surround the concrete pile are provided on both sides of the moving table, and the moving table and the guide member are provided with guide rollers that roll on the peripheral surface of the concrete pile.