JP2018001959A - Attaching/detaching jig, mounting method of crawler frame, removing method of crawler frame, and construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching/detaching jig capable of safely and reliably attaching and detaching a crawler frame even when a sufficient space cannot be ensured in a central part of a lower structure.SOLUTION: An attaching/detaching jig 5 comprises a bracket rod 6 and a bracket flange 7. The bracket rod 6 extends along an extension direction of a central axis of a cylinder 4 in a state of being connected to a clevis 41 at a tip of the cylinder 4. The bracket flange 7 has a cylindrical part 73 that can be inserted through the bracket rod 6, and a contact surface 71A capable of coming into contact with a side face of the crawler frame, which faces outward in a vehicle width direction. A plurality of bolt holes 631h-634h for fixing the bracket flange 7 are formed on the bracket rod 6 at predetermined intervals along the extension direction. The cylindrical part 73 is fixed to any one of the plurality of bolt holes 631h-634h in a state of being inserted through the bracket rod 6.SELECTED DRAWING: Figure 5

Description

The present invention relates to a detachment jig for detaching a crawler frame in a construction machine and a technique related thereto.

  In a large-sized construction machine, the crawler frame of the lower traveling body may be detached from the car body and transported separately in view of weight restrictions during transportation. Conventionally, the crawler frame has been removed while being lifted by a crane. At that time, if the crawler is hung in a state where the front-rear direction of the upper swing body overlaps with the traveling direction of the crawler, there is a problem that the lifting tool interferes with the upper swing body. Therefore, a method in which the upper revolving unit is rotated 90 degrees toward the crawler side to be removed first, one of the crawlers is removed, and then the upper revolving unit is rotated 180 degrees to remove the other crawler (hereinafter also referred to as a first conventional method). ) Was adopted.

  Moreover, there exists a method as described in patent document 1 as a method of removing a crawler. In Patent Document 1, as shown in FIG. 3, a subaxle (13) is provided at the tip of the axle beam (12), a bracket (14) is attached to the tip of the subaxle (13), and the bracket (14). A link (15) is pivotally supported by a support pin (16) at the tip of the shaft. When removing the crawler (17), the subaxle (13) and the link (15) are linearized, the cylinder (23) shown in FIG. 1 is extended, and the crawler (17) is removed (hereinafter referred to as the first). 2 is also called conventional method).

JP-A-9-315352

  However, in the above-described first conventional method, the work procedure is complicated, and the crawler is suspended while the upper revolving body is rotated 90 degrees, so that the balance becomes unstable and the vehicle may fall over.

  Further, in the above-described second conventional method, when a sufficient space cannot be secured in the central portion of the lower traveling body (specifically, the region between the car body and the crawler frame), the crawler can be extended to a position where it can be completely removed. There is a problem that cylinders cannot be arranged.

  Therefore, the present invention provides a detachable jig and a technique related thereto that can safely and reliably detach the crawler frame even when a sufficient space cannot be secured in the central portion of the lower traveling body. For the purpose.

  In order to achieve the above object, the present invention provides a car body, an axle projecting in the vehicle width direction of the car body, a crawler frame detachable from the axle, and the crawler frame in a vehicle width direction. A detaching jig for detaching the crawler frame from the axle in a construction machine including a lower traveling body including a cylinder, and extending direction of a central axis of the cylinder in a state of being connected to a tip of the cylinder A bracket rod having a bracket rod extending along the cylinder rod, a cylindrical portion that can be inserted into the bracket rod, and a contact surface that can contact a side surface of the crawler frame that faces outward in the vehicle width direction. The crawler frame is a through-hole penetrating the side surface and can be inserted through the bracket rod. The bracket rod is formed with a plurality of fixing holes for fixing the bracket flange at predetermined intervals along the extending direction, and when the crawler frame is attached and detached, The cylindrical portion of the bracket flange is fixed to one of the plurality of fixing holes in a state of being inserted into a protruding portion protruding from the side surface of the bracket rod, and the contact surface of the bracket flange is There is provided a detachable jig characterized by contacting a side surface.

  Moreover, it is preferable that the contact surface is connected in a state of being in contact with the side surface in the removal operation of removing the crawler frame from the axle.

  Further, the present invention is a crawler frame mounting method for mounting the crawler frame to the axle using the above-described detachment jig, and a) connecting the bracket rod to the tip of the cylinder; b) Attaching an axle extension bracket to the tip of the axle and placing the crawler frame on the axle extension bracket; c) elongating the cylinder, and attaching the cylinder portion of the bracket flange to the bracket Passing through the protruding portion of the rod, and fixing the bracket flange to the bracket rod through a tip side fixing hole formed on the tip side among the plurality of fixing holes, and d) contracting the cylinder, The crawler frame is moved to the car body side by bringing the contact surface into contact with the side surface. E) releasing the fixation between the bracket flange and the bracket rod, extending the cylinder, and through the proximal end side fixing hole formed on the proximal side with respect to the distal end side fixing hole. A crawler frame mounting method further comprising: re-fixing a bracket flange to the bracket rod; and f) retracting the cylinder and further pulling the crawler frame toward the car body. doing.

  The present invention is also a method of removing a crawler frame for removing the crawler frame from the axle using the above-described detachment jig, wherein a) the bracket rod is connected to the tip of the cylinder and the axle is extended. A step of attaching a bracket for the use of the bracket, and b) inserting the tubular portion of the bracket flange into the protruding portion of the bracket rod, and through a proximal end side fixing hole formed on the proximal end side among the plurality of fixing holes. Fixing the bracket flange to the bracket rod; c) connecting the contact surface to the side surface with the contact surface in contact with the side surface; and d) connecting the cylinder Elongating and pushing the crawler frame away from the car body; e) the bracket flange and the front Releasing the fixation with the bracket rod, contracting the cylinder, and re-fixing the bracket flange to the bracket rod through a distal end side fixing hole formed on the distal end side with respect to the proximal end side fixing hole; f) extending the cylinder and further pushing the crawler frame away from the car body, and further providing a method of removing the crawler frame.

  Further, the present invention is a construction machine, comprising a car body, an axle projecting in a vehicle width direction of the car body, a crawler frame detachable from the axle, and the crawler frame in the vehicle width direction. A cylinder for expanding and contracting, and a detaching jig for detaching the crawler frame from the axle, wherein the detaching jig is extended to a central axis of the cylinder in a state of being connected to a tip of the cylinder A bracket rod having a bracket rod extending along a direction, a cylindrical portion that can be inserted through the bracket rod, and a contact flange that can contact a side surface of the crawler frame that faces outward in the vehicle width direction. The crawler frame is formed with a through-hole penetrating the side surface through which the bracket rod can be inserted. In the bracket rod, a plurality of fixing holes for fixing the bracket flange are formed at predetermined intervals along the extending direction, and when the crawler frame is detached, the bracket flange The tube portion is fixed to one of the plurality of fixing holes in a state of being inserted into a portion protruding from the side surface of the bracket rod, and the contact surface of the bracket flange is in contact with the side surface. The construction machine characterized by this is further provided.

  According to the present invention, it is possible to perform the crawler frame attaching / detaching operation using the attaching / detaching jig including the bracket rod and the bracket flange. Therefore, it is not necessary to rotate the upper swing body during the detaching operation, and the cylinder disposed at the center of the lower traveling body is not limited. Therefore, even when a sufficient space cannot be secured in the central portion of the lower traveling body, the crawler frame can be safely and reliably attached and detached.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. The figure which looked at the lower traveling body in the state where the left crawler frame was removed from the front of the machine. The III arrow line view of FIG. The top view which shows a left side crawler frame. The perspective view which shows the detachable jig | tool connected to a cylinder and a cylinder. The figure which shows the state which the bracket flange inserted in the bracket rod. The figure which shows the state in which the bracket rod was connected to the front-end | tip of a cylinder. The figure which shows the state by which the crawler frame was mounted in the bracket for axle extension. The figure which shows the state in which the bracket flange was fixed to the bracket rod. The figure which shows the state by which the crawler frame was drawn in to the car body side. The figure which shows the state by which the crawler frame was further drawn in by the car body side. The figure which shows the state from which the removal jig | tool was removed from the cylinder front-end | tip. The figure which shows the state which the crawler frame returned to the widened state. The figure which shows the state in which the bracket rod was connected to the front-end | tip of a cylinder. The figure which shows the state in which the bracket flange was fixed to the bracket rod, and was connected to the side surface of the crawler frame. The figure which shows the state by which the crawler frame was extruded outside. The figure which shows the state by which the crawler frame was further extruded outside.

<1. Embodiment>
A detachment jig, a crawler frame mounting method, a crawler frame removal method, and a construction machine according to an embodiment of the present invention will be described with reference to FIGS. Hereinafter, as an example of the construction machine according to the present invention, a hydraulic excavator 1 illustrated in FIG. 1 is illustrated. In each drawing, the longitudinal direction and the lateral direction of the machine are appropriately defined as necessary.

  As shown in FIG. 1, the hydraulic excavator 1 includes a crawler type lower traveling body 2 and an upper swing body 3. The upper swing body 3 is mounted on the lower travel body 2 and can swing around the vertical axis with respect to the lower travel body 2.

  As shown in FIG. 2, the lower traveling body 2 includes a car body 10 that supports the upper swing body 3, left and right crawler frames 20 that support the car body 10, and the like. The left and right crawler frames 20 can be changed in distance in the vehicle width direction or removed from the car body 10.

  The car body 10 is a hollow frame structure with enhanced strength and rigidity. A swivel bearing (not shown) is installed on the upper surface of the car body 10. The upper swing body 3 is rotatably supported with respect to the car body 10 via the swing bearing.

  Further, as shown in FIG. 2, the car body 10 is provided with an axle 11 that protrudes in the vehicle width direction (left-right direction). As shown in FIG. 3, two axles 11 are provided on both the front and rear sides. When the crawler frame 20 is removed and attached, the axle extension bracket 13 is attached to the tip of the axle 11.

  Further, as shown in FIG. 3, the car body 10 is provided with a cylinder 4 between the front and rear axles 11 for widening the crawler frame 20 in the vehicle width direction. In FIG. 3, only the left side is shown for the sake of space, but the cylinder 4 is also installed on the right side on the opposite side.

  The cylinder 4 is connected to the side surface of the crawler frame 20 using a connection bracket 8 (FIGS. 12 and 13) attached to the clevis 41 at the tip. Specifically, the connection bracket 8 is attached to the clevis 41 of the cylinder 4, and the connection bracket 8 is connected to the side surface 20 </ b> A (FIG. 4) of the crawler frame 20. When the cylinder 4 is expanded and contracted in such a state, the crawler frame 20 is expanded in the vehicle width direction (left-right direction).

  As shown in FIG. 4, the crawler frame 20 is a long structure, and is installed in parallel to each other on both sides of the car body 10 so as to extend in the front-rear direction.

  The crawler frame 20 has two front and rear axle insertion holes 21 that penetrate the left and right side surfaces in the vehicle width direction (left and right direction). The axle 11 is inserted into the axle insertion hole 21 when the crawler frame 20 is attached.

  In addition, a through hole 23 that penetrates the left and right side surfaces in the vehicle width direction is formed in the approximate center of the crawler frame 20. A cylinder 4 and a later-described detaching jig 5 (FIG. 5) connected to the cylinder 4 are inserted into and removed from the through-hole 23 when the crawler frame 20 is detached.

  Next, the detachment jig 5 for detaching the crawler frame 20 from the axle 11 will be described. As shown in FIG. 5, the detachment jig 5 includes a bracket rod 6 connected to the clevis 41 at the tip of the cylinder 4 and a bracket flange 7 attached to the bracket rod 6.

  The bracket rod 6 includes a connecting portion 61 connected to the clevis 41 and an extending portion 63 extending from the connecting portion 61 along the extending direction of the central axis of the cylinder 4.

  The connecting portion 61 includes a connecting plate 61a, an upper plate 61b, a lower plate 61c, and a rotation preventing member 61d.

  The base end of the extending portion 63 is connected to the connection plate 61a. The clevis 41 is disposed between the upper plate 61b and the lower plate 61c when connected to the cylinder 4. Further, pin holes are formed in the upper plate 61b and the lower plate 61c. The bracket rod 6 is connected to the clevis 41 by inserting a connecting pin (not shown) in a state where the clevis 41 is disposed between the upper plate 61b and the lower plate 61c.

  The rotation preventing member 61d is a member for preventing the cylinder 4 from swinging in the horizontal direction. The rotation preventing member 61d is configured to be detachable from the lower plate 61c with a bolt. A U-shaped recess 610d is formed in the rotation preventing member 61d, and the base end of the clevis 41 is held in the recess 610d.

  The extending portion 63 is a rod-shaped member extending from the connecting portion 61 along the extending direction of the central axis of the cylinder 4. Four bolt holes 631h, 632h, 633h, and 634h for fixing the bracket flange 7 are formed in the extending portion 63 at predetermined intervals.

  The bracket flange 7 includes a cylindrical portion 73 that can be inserted through the extending portion 63 of the bracket rod 6 and a protruding edge portion 71 that protrudes outward from the outer periphery of the cylindrical portion 73.

  A bolt hole 73 h for fixing the bracket flange 7 to the bracket rod 6 is formed on the outer periphery of the cylindrical portion 73. The bolt hole 73h is aligned with any of the four bolt holes 631h to 634h of the bracket rod 6, and the bolt is inserted. For example, in FIG. 6, the bolt hole 73 h is aligned with the bolt hole 632 h formed in the extending portion 63 of the bracket rod 6. In this state, when the bolt is inserted through the bolt hole 73h and the bolt hole 632h, the bracket flange 7 is fixed to the bracket rod 6 at the position shown in FIG.

  Further, as shown in FIG. 5, the protruding edge portion 71 is a donut-shaped disk member protruding from the outer periphery of the cylindrical portion 73. The projecting edge portion 71 includes a contact surface 71A that contacts the side surface 20A (FIG. 4) of the crawler frame 20 facing the outside in the vehicle width direction (left-right direction). A plurality of bolt holes 71h for fixing to the side surface 20A (FIG. 4) in the removal operation of the crawler frame 20 are formed in the contact surface 71A along an arc shape.

  Then, the attachment method of the crawler frame 20 using the above-mentioned removal jig | tool 5 (FIG. 5) is demonstrated, referring FIGS. 7-13.

  First, as shown in FIG. 7, the axle extension bracket 13 is attached to the tip of the axle 11, and the connecting portion 61 of the bracket rod 6 is connected to the clevis 41 of the cylinder 4.

  Thereafter, as shown in FIG. 8, the crawler frame 20 is suspended by a crane (not shown) and the crawler frame 20 is placed on the axle extension bracket 13. At this time, a part of the axle extension bracket 13 is inserted into the axle insertion hole 21 of the crawler frame 20. Further, the extending portion 63 of the bracket rod 6 is inserted into the through hole 23 of the crawler frame 20.

  Then, as shown in FIG. 9, the cylinder 4 is extended, and a part of the extending portion 63 of the bracket rod 6 is protruded from the side surface 20A. Then, the cylindrical portion 73 of the bracket flange 7 is inserted through the protruding portion of the extending portion 63 protruding from the side surface 20A. And the bolt hole 73h (FIG. 5) formed in the cylindrical part 73 is aligned with the bolt hole 634h (FIG. 5) formed in the most front end side of the extending part 63, and the bolt is inserted and fixed. Thereby, the bracket flange 7 is connected to the bracket rod 6.

  When the cylinder 4 is gradually contracted from this state, the crawler frame 20 is pulled toward the car body 10 with the contact surface 71A of the protruding edge 71 of the bracket flange 7 in contact with the side surface 20A of the crawler frame 20.

  Then, when the crawler frame 20 is pulled to the position shown in FIG. 10, the bracket flange 7 and the bracket rod 6 are released and the cylinder 4 is extended again. Thereafter, as shown in FIG. 10, the bolt hole 73 h (FIG. 5) formed in the cylindrical portion 73 is inserted into the bolt hole 633 h (FIG. 5) one before (the base end side) of the bolt hole 634 h of the extending portion 63. Align and fix with bolts. Thereby, the bracket flange 7 is connected to the bracket rod 6 again.

  When the cylinder 4 is gradually contracted from this state, the crawler frame 20 is further pulled to the car body 10 side in a state where the contact surface 71A of the projecting edge portion 71 of the bracket flange 7 is in contact with the side surface 20A of the crawler frame 20. .

  In accordance with such a procedure, the crawler frame 20 is pulled in while moving the position at which the bracket flange 7 is fixed to the bolt hole on the proximal end one by one. Finally, the crawler frame 20 is pulled to the position shown in FIG.

  Thereafter, the axle extension bracket 13 is removed from the front end of the axle 11 as shown in FIG. Further, the cylinder 4 is extended, the bracket flange 7 is removed from the bracket rod 6, and the bracket rod 6 is removed from the clevis 41. The connecting bracket 8 is connected to the clevis 41 from which the bracket rod 6 has been removed.

  Then, as shown in FIG. 13, the cylinder 4 is contracted to connect the connection bracket 8 to the side surface 20 </ b> A of the crawler frame 20. Thereafter, the cylinder is slightly extended, and the crawler frame 20 is shifted to the widened state.

  Next, a method for removing the crawler frame 20 using the detaching jig 5 will be described with reference to FIGS.

  In the method of removing the crawler frame 20, basically, the procedure opposite to the above-described attachment method is performed except for a part.

  Specifically, as shown in FIG. 14, first, the axle extension bracket 13 is attached to the axle 11. Further, the connecting bracket 8 connected to the clevis 41 is removed, and the bracket rod 6 is connected to the clevis 41 instead.

  Thereafter, the cylindrical portion 73 of the bracket flange 7 is inserted into the extending portion 63. Then, the bolt hole 73h (FIG. 5) formed in the cylindrical portion 73 is aligned with the bolt hole 631h (FIG. 5) formed on the most proximal side of the extending portion 63, and the bolt is inserted and fixed. Thereby, the bracket flange 7 is connected to the bracket rod 6.

  From this state, the cylinder 4 is contracted, and the contact surface 71A of the projecting edge portion 71 of the bracket flange 7 is brought into contact with the side surface 20A of the crawler frame 20, resulting in the state shown in FIG. Then, the bracket flange 7 is connected to the side surface 20A of the crawler frame 20 through a plurality of bolt holes 71h formed in the contact surface 71A.

  When the cylinder 4 is gradually extended from this state, the crawler frame 20 is pushed out to the side (outside) away from the car body 10.

  Then, when the crawler frame 20 is pushed out to the position shown in FIG. 16, the bracket flange 7 and the bracket rod 6 are released, and the cylinder 4 is contracted again. Thereafter, as shown in FIG. 17, the bolt hole 73 h (FIG. 5) formed in the cylindrical portion 73 is aligned with the bolt hole 632 h (FIG. 5) that is one tip side than the bolt hole 631 h of the extending portion 63. Insert the bolt and fix it. Thereby, the bracket flange 7 is connected to the bracket rod 6 again.

  According to such a procedure, the crawler frame 20 is pushed out while moving the position where the bracket flange 7 is fixed to the bolt hole on the tip side one by one. When the bolt hole 634h (FIG. 5) at the front end is reached, the crawler frame 20 is hung and removed by a crane (not shown). Further, the axle extension bracket 13 is removed from the axle 11, and the bracket rod 6 is removed from the clevis 41 of the cylinder 4.

  As described above, according to the present embodiment, the crawler frame 20 can be attached / detached using the attaching / detaching jig 5 including the bracket rod 6 and the bracket flange 7. Therefore, it is not necessary to rotate the upper swing body 3 during the detaching operation, and the cylinder disposed in the center portion of the lower traveling body 2 is not limited to one having a large stroke. Therefore, even when a sufficient space cannot be ensured in the center of the lower traveling body 2, the crawler frame 20 can be safely and reliably detached and attached. Also, complicated work procedures such as rotating the upper swing body 3 are eliminated. Further, since the bracket flange 7 is fixed outside the crawler frame 20, it is not necessary to perform a dangerous work such as entering the crawler frame 20.

  Further, in the present embodiment, the crawler frame 20 is attached and detached by a simple method such as appropriately selecting a position for fixing the bracket flange 7 from the four bolt holes 631h to 634h formed in the extending portion 63 of the bracket rod 6. be able to.

  Further, according to the present embodiment, in the attaching operation for attaching the crawler frame 20 to the axle 11, the crawler frame 20 is retracted by bringing the contact surface 71 </ b> A of the protruding edge portion 71 of the bracket flange 7 into contact with the side surface 20 </ b> A of the crawler frame 20. It is. Therefore, it is not necessary to connect the contact surface 71A to the side surface 20A, and the work efficiency is good.

<2. Modification>
The attaching / detaching jig, the crawler frame attaching method, the crawler frame removing method and the construction machine according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. is there.

  For example, although the case where the four bolt holes 631h-634h are formed in the extending | stretching part 63 of the bracket rod 6 was illustrated in the said embodiment, it is not limited to this. More bolt holes may be formed in the extending portion 63 or fewer bolt holes may be formed depending on the extendable range of the cylinder and the size of the crawler frame.

  Moreover, although the hydraulic excavator 1 was illustrated as an example of a construction machine in the said embodiment, it is not limited to this, You may apply this invention to other construction machines, such as a crawler type demolition machine and a crane.

  As described above, the detaching jig according to the present invention is suitable for a hydraulic excavator or the like capable of detaching a crawler frame.

1 hydraulic excavator, 2 lower traveling body, 3 upper swing body, 4 cylinder, 5 detaching jig,
6 Bracket rod, 7 Bracket flange, 8 Connection bracket,
10 car body, 11 axle, 13 axle extension bracket,
20 crawler frame, 20A side, 21 axle insertion hole,
23 through hole, 41 clevis, 61 connecting portion, 61a connecting plate, 61b upper plate,
61c Lower plate, 61d Anti-rotation member, 63 Extension part, 71 Projection part, 71A Contact surface,
71h bolt hole, 73 cylindrical part, 73h bolt hole, 631h to 634h bolt hole

Claims (5)

Construction machine comprising a car body, an axle projecting in the vehicle width direction of the car body, a crawler frame detachable from the axle, and a cylinder for expanding and contracting the crawler frame in the vehicle width direction A detachable jig for detaching the crawler frame from the axle,
A bracket rod extending along the extending direction of the central axis of the cylinder in a state connected to the tip of the cylinder;
A bracket flange having a cylindrical portion that can be inserted into the bracket rod, and a contact surface that can contact a side surface of the crawler frame facing outward in the vehicle width direction;
With
The crawler frame is formed with a through-hole penetrating the side surface and through which the bracket rod can be inserted,
In the bracket rod, a plurality of fixing holes for fixing the bracket flange are formed at predetermined intervals along the extending direction;
When the crawler frame is attached or detached, the cylindrical portion of the bracket flange is fixed to one of the plurality of fixing holes in a state of being inserted into a protruding portion protruding from the side surface of the bracket rod, and the bracket The attachment / detachment jig, wherein the contact surface of the flange contacts the side surface.   The detachment jig according to claim 1, wherein the contact surface is connected in contact with the side surface in a removal operation of removing the crawler frame from the axle. A crawler frame mounting method for mounting the crawler frame to the axle using the detachable jig according to claim 1,
a) connecting the bracket rod to the tip of the cylinder;
b) mounting an axle extension bracket on the tip of the axle, and placing the crawler frame on the axle extension bracket;
c) The cylinder is extended, the cylindrical portion of the bracket flange is inserted into the protruding portion of the bracket rod, and the bracket flange is inserted through a distal end side fixing hole formed on the distal end side among the plurality of fixing holes. Securing the bracket rod to the bracket rod;
d) contracting the cylinder, bringing the abutment surface into contact with the side surface, and pulling the crawler frame toward the car body;
e) Release the fixing of the bracket flange and the bracket rod, extend the cylinder, and connect the bracket flange to the bracket via the base end side fixing hole formed on the base end side with respect to the tip end side fixing hole. Re-fixing to the rod;
f) contracting the cylinder and further pulling the crawler frame toward the car body;
A crawler frame mounting method comprising the steps of: A crawler frame removing method for removing the crawler frame from the axle using the detaching jig according to claim 2,
a) connecting the bracket rod to the tip of the cylinder and attaching an axle extension bracket;
b) The cylindrical portion of the bracket flange is inserted into the protruding portion of the bracket rod, and the bracket flange is connected to the bracket rod via a proximal end fixing hole formed on the proximal end side among the plurality of fixing holes. A step to fix to,
c) connecting the contact surface to the side surface in a state where the contact surface is in contact with the side surface;
d) extending the cylinder and pushing the crawler frame away from the car body;
e) Release the fixation between the bracket flange and the bracket rod, contract the cylinder, and connect the bracket flange to the bracket rod via the distal end side fixing hole formed at the distal end side with respect to the proximal end side fixing hole. To re-fix to
f) extending the cylinder and further pushing the crawler frame away from the car body;
A method for removing a crawler frame, comprising: A construction machine,
Car body,
An axle projecting in the vehicle width direction of the car body;
A crawler frame detachable from the axle;
A cylinder for expanding and contracting the crawler frame in the vehicle width direction;
A detaching jig for detaching the crawler frame from the axle;
With
The detaching jig is
A bracket rod extending along the extending direction of the central axis of the cylinder in a state connected to the tip of the cylinder;
A bracket flange having a cylindrical portion that can be inserted into the bracket rod, and a contact surface that can contact a side surface of the crawler frame facing outward in the vehicle width direction;
With
The crawler frame is formed with a through-hole penetrating the side surface and through which the bracket rod can be inserted,
In the bracket rod, a plurality of fixing holes for fixing the bracket flange are formed at predetermined intervals along the extending direction;
When the crawler frame is attached and detached, the cylindrical portion of the bracket flange is fixed to any one of the plurality of fixing holes in a state of being inserted into a portion protruding from the side surface of the bracket rod, and the bracket flange The construction machine is characterized in that the abutment surface abuts on the side surface.

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