JP2015105161A - Crawler type work vehicle, and method of attaching in crawler type work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler type work vehicle equipped with jack-up devices, in which an attachment can be attached from the jack-up device extended position side.SOLUTION: A jack-up device 200 turnably fixed to a jack-up support member 310, includes a beam 210 installed between a storage position that extends in a travelling direction along the lateral side of a side frame and an extended position that extends in a direction intersects with the travelling direction, in which a distance between the center of gravity of a vehicle and a toppling fulcrum of the jack-up device in the extended position is larger than a distance between the center of gravity of the vehicle and a toppling fulcrum of an under traveling body 1 in the front or the rear.

Description

  The present invention relates to a crawler work vehicle including a jackup device and a method for assembling the crawler work vehicle.

Some crawler work vehicles such as a crawler crane and a crawler hydraulic excavator include a jack-up device for preventing the vehicle from toppling over when a boom or a front attachment is assembled to a vehicle body.
A pair of jack-up devices are attached to each of the pair of traveling devices provided on both sides of the car body, and after the boom and the front attachment are assembled, when the work is performed, it is removed to reduce the work area by the vehicle. . In other words, the jack-up device requires time and labor for assembling to and removing from the vehicle, reducing work efficiency.

  In order to reduce this effort, there is known an outrigger device that attaches an outrigger to the front and rear portions of each traveling device so that the outrigger can be rotated and is stored in the traveling device during traveling, thereby eliminating the need for assembling and removing the outrigger. It has been. This outrigger device has a structure in which the rotation fulcrum of the outriggers at the front and rear portions is attached to the traveling device so as to be stepped in the vertical direction, and is rotated so as to cross each other and is extended to the side of the traveling device. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 7-35559

  In the outrigger device described in Patent Document 1 described above, each outrigger has a structure that can rotate by approximately 180 °, and when assembling the front attachment, the rotation of each outrigger may be set to the locked state. Absent. In a state where the pair of outriggers intersect and a state where the pair of outriggers are opened to the maximum, the length from the center of gravity of the vehicle to the overturning fulcrum of the outrigger is very small. For this reason, if the attachment is assembled to the vehicle in a state where the front attachment extends in a direction orthogonal to the traveling direction, a possibility of overturning occurs.

(1) A crawler type work vehicle according to the invention of claim 1 includes an upper revolving unit to which an attachment is attached, a lower traveling unit having a pair of traveling units each having a side frame and a crawler belt, and a pair of traveling units. And a jack-up support member that is provided on a side frame of the traveling device and supports each jack-up device, and the jack-up device is a jack-up device. A beam that is pivotally attached to the up support member and is set at a retracted position that extends in the traveling direction on the side of the side frame and an extended position that extends in a direction intersecting the traveling direction. The distance between the center of gravity of the vehicle and the overturning fulcrum of the jack-up device at the overhang position is Is larger than the distance between tipping fulcrum of rectangular or backward.
(2) The invention of claim 2 is the crawler type work vehicle according to claim 1, wherein the pivot point of the beam rotatably attached to the jack-up support member is located outside the side end surface of the crawler belt. It is what you are doing.
(3) The invention of claim 3 is the crawler work vehicle according to claim 1 or 2, further comprising a lock mechanism for locking the jack-up support member and the beam at the retracted position and the extended position.
(4) According to a fourth aspect of the present invention, in the crawler-type work vehicle according to the third aspect, the jack-up device further includes a float attached to the tip of the beam so as to be movable up and down. It is separated from the side surface of the frame.
(5) A method for assembling a crawler work vehicle according to the invention of claim 5 includes an upper turning body and a lower traveling body, and a pair of the traveling apparatuses of the lower traveling body disposed in front and rear in the traveling direction. Prepare a vehicle provided with a jack-up support member, attach a jack-up device to each of the jack-up support members so as to be rotatable, and extend each jack-up device in a direction crossing the traveling direction. Set to position, attach the upper revolving unit with the attachment extending in a direction almost perpendicular to the running direction, raise the attachment on the upper revolving unit, and set the jack-up device to the retracted position The work using the attachment is started.

  According to the present invention, the attachment can be assembled to the vehicle in a state where the attachment extends in a direction intersecting the traveling direction.

1 is an external side view of a crawler crane as an embodiment of a crawler work vehicle of the present invention. In FIG. 1, the external appearance perspective view of the lower traveling body in the state in which the jackup apparatus was set to the overhang position. In FIG. 2, the external appearance perspective view of the state in which the jackup apparatus was set to the storage position. The top view for demonstrating the structure which rotates a jackup apparatus between an overhanging position and a storage position. The top view which removed the crawler in FIG. The top view which shows the assembly | attachment structure of a jackup support member and a jackup apparatus. VII-VII line sectional drawing in FIG. VIII-VIII sectional view taken on the line in FIG. The figure for demonstrating the positional relationship of a float and a crawler in a jackup apparatus in a storing position. The flowchart which shows the method of mounting | wearing with a jackup apparatus to a vehicle with no attachment. The flowchart which shows the method of assembling | attaching an attachment to a jackup apparatus mounting vehicle. The flowchart which shows the method of disassembling and transporting an attachment and a jackup apparatus.

[Overall structure of crawler work vehicle]
Hereinafter, an embodiment of a crawler work vehicle according to the present invention will be described with reference to the drawings.
FIG. 1 is an external side view of a crawler crane as an example of a crawler work vehicle according to the present invention. The crawler crane (hereinafter referred to as “vehicle”) M1 is rotated around the lower swinging body 1, the upper swinging body 3 provided on the lower traveling body 1 via the swiveling wheel 2, and the upper swinging body 3. And a boom 4 that is pivotally supported. The upper swing body 3 is equipped with a hoisting drum (not shown) that is a winch drum for hoisting and a hoisting drum (not shown) that is a hoisting winch drum. The hoisting rope 5a is wound around the hoisting drum, and the hoisting rope 5a is wound or fed out by driving of the hoisting drum, and the hook 7 is moved up and down. The hoisting rope 6a is wound around the hoisting drum, and the hoisting rope 6a is wound or fed out by driving of the hoisting drum, and the boom 4 is raised and lowered.

The upper swing body 3 is provided with a cab 8 on the front side, and a counterweight 9 is mounted on the rear end. In the following description, the cab 8 side is the front and the counterweight 9 side is the rear.
The lower traveling body 1 includes a pair of left and right traveling devices 104, and each traveling device 104 travels by driving a crawler belt 108 constituting a crawler 110 by driving wheels 114 driven by a travel motor (not shown). . A crawler belt 108 is attached to the outer periphery of the crawler 110. Although not shown, the crawler belt 108 is formed in an endless belt shape by a large number of shoes connected by pins. The crawler belt 108 is attached to the outer periphery of a drive wheel 114, an idler 115, an upper roller 112, and a lower roller 113 attached to the side frame 109.

  A pair of jackup devices 200 are attached to each traveling device 104 of the lower traveling body 1. One of the jackup devices 200 is attached in front of the center of gravity of the vehicle M1, and the other is attached behind the center of gravity of the vehicle M1. Each jack-up device 200 is stored on the inner peripheral side of the crawler belt 108 in front of the upper roller 112 and the lower roller 113, in other words, outside the crawler 110. In this stored state, the vehicle M1 Move forwards and backwards, and lift and lower suspended loads.

[Lower body]
2 is an external perspective view of the lower traveling body in a state where the jack-up device in FIG. 1 is set to the extended position, and FIG. 3 is an external view in a state in which the jack-up device is set to the storage position in FIG. It is a perspective view. 4 is a top view for explaining a configuration in which the jack-up device is rotated between the extended state and the retracted state, FIG. 5 is a top view in which the crawler in FIG. 4 is removed, and FIG. It is a top view which shows the assembly | attachment structure of a jackup support member and a jackup apparatus.
The lower traveling body 1 includes a car body 106, a total of four axle beams 105 (only two are shown in FIGS. 2 and 3) extending in the left-right direction at the front and rear parts of the car body 106, a pair of It is comprised from the traveling apparatus 104 (only one is shown in FIG. 2, FIG. 3). The crawler 110 of each traveling device 104 includes a side frame 109 and a crawler belt 108. The crawler 110 is attached to the two axle beams 105 by pins (not shown) or the like.

A pair of jack-up support members 310 are attached to the side surfaces of the side frames 109 by fastening members such as bolts.
The jackup device 200 is rotatably attached to the jackup support member 310. The jack-up device 200 includes a beam 210 and a float 220. The overhanging position in which the beam 210 extends in the front-rear direction of the vehicle M1 illustrated in FIG. 2, that is, the direction substantially orthogonal to the traveling direction, is illustrated in FIG. It rotates between the retracted position where the beam 210 extends in a direction substantially parallel to the longitudinal direction of the vehicle M1. 4 and 5, the jack-up device 200 in the extended position is illustrated by a solid line, and the jack-up device 200 in the retracted position is illustrated by a two-dot chain line.

[Jack-up device]
7 is a cross-sectional view taken along the line VII-VII in FIG. 4, and FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG.
As shown in FIGS. 7 and 8, the side frame 109 of the crawler 110 is provided with a side wall 120 standing upright with respect to the side surface, and extends on the upper side of the side wall 120 in the traveling direction. In the lower portion of the locking pin 121, a through hole is provided that penetrates the side wall 120 in the thickness direction, that is, in the traveling direction.
The jack-up support member 310 has a U-shaped cross section obtained by integrating a main body 311, an upper plate 312 horizontally disposed on the upper end surface, and a lower plate 313 horizontally disposed on the lower end surface of the main body 311. It is a structure of shape. The main body 311 is formed with an engagement groove 314 that engages with the locking pin 121 of the side frame 109 and a through hole corresponding to the through hole of the side wall 120 of the side frame 109.
The jackup support member 310 engages the engagement groove 314 of the main body 311 with the locking pin 121 of the side wall 120, and in this state, the fixing pin 401 is connected to the through hole of the side wall 120 and the main body 311 of the jackup support member 310. And is fixed to the side frame 109.

The upper plate 312 of the jack-up support member 310 is formed with a shaft hole 312a at the center and three locking holes 312b, 312c, and 312d at the periphery (see FIG. 6 and the like). The locking hole 312 b is provided at a position where a straight line connecting the center of the locking hole 312 b and the center of the shaft hole 312 a is perpendicular to the side surface of the side frame 109. The locking hole 312c, the shaft hole 312a, and the locking hole 312d are arranged in a straight line, and are formed in a direction perpendicular to a straight line connecting the center of the locking hole 312b and the center of the shaft hole 312a.
A shaft hole 313a (see FIG. 7) is formed in the lower plate 313 of the jack-up support member 310 at a position facing the shaft hole 312a of the upper plate 312.

  As shown in FIG. 7, a shaft hole 210 a is formed on the side opposite to the float 220 mounting side of the beam 210 of the jackup device 200. The rotation support shaft 410 is inserted into the shaft hole 312 a of the upper plate 312, the shaft hole 210 a of the beam 210 of the jackup device 200, and the shaft hole 313 a of the lower plate 313. A suspension ring 411 is attached to the upper end of the rotation spindle 410. Further, the lower end portion of the rotation support shaft 410 protrudes downward from the lower plate 313, and a stop pin 413 is inserted into the protruding portion. Thereby, the beam 210 of the jackup device 200 is supported by the jackup support member 310 so as to be rotatable about the rotation support shaft 410.

  The shaft hole 312a of the upper plate 312 and the shaft hole 313a of the lower plate 313 of the jack-up support member 310 are located outside the side end surface 108a of the crawler belt 108 so that the insertion / extraction operation of the rotation support shaft 410 is not hindered by the crawler 110. (See FIGS. 4 and 8).

The beam 210 of the jack-up device 200 includes a beam portion of a box structure whose cross-sectional secondary moment is reduced toward the tip, and sliding plates 211 disposed on the upper surface and the lower surface of the rotation fulcrum side base end of the beam portion. Have. The beam 210 has a shape as viewed from above, and on the jack-up support member 310 side, a sliding plate 211 indicated by a dotted line in FIGS. 4 and 6 and a beam portion are connected in an approximately L shape. The sliding plate 211 is formed with one locking hole at a position facing the locking holes 312b to 312d of the upper plate 312 of the jack-up support member 310.
As shown in FIGS. 4 and 8, the lock pin 420 is inserted into the lock hole 312 b of the upper plate 312 and the lock hole of the beam 210. The lock pin 420 has a head portion whose outer diameter is larger than the diameter of the lock hole 312 b of the upper plate 312, and the retaining pin 421 is inserted into the lower end portion that has come out downward from the beam 210.

Therefore, the jackup device 200 is rotatably connected to the jackup support member 310 by the rotation support shaft 410, and the lock hole 312c of the jackup support member 310 and the lock hole of the beam 210 are aligned and locked. When locked by the pin 420, the jack-up device 200 is set to an overhang position that is substantially perpendicular to the side surface of the side frame 109, as shown by solid lines in FIGS.
4 and 5, the jack-up device 200 is rotated counterclockwise so that the locking hole of the beam 210 is aligned with the locking hole 312 b of the jack-up support member 310. When the two members are locked by the lock pin 420, the jack-up device 200 is set in the retracted position near the crawler 110 in a state substantially parallel to the side surface of the side frame 109, as shown in FIG.

Although the above demonstrated the jackup apparatus 200 arrange | positioned at the front side of the vehicle M1, it is the same also about the jackup apparatus 200 arrange | positioned at the back side of the vehicle M1.
However, if the sliding plate 211 of the beam 210 of the jackup device 200 does not bend to the opposite side of the rotation direction of the jackup device 200, the sliding plate 211 abuts against the side frame 109 and rotates the jackup device 200. It becomes an obstacle of movement. Alternatively, it is necessary to provide a useless space in order to avoid the sliding plate 211 coming into contact with the side frame 109. For this reason, in the jack-up device 200 on the rear side of the vehicle M1, the sliding plate 211 of the beam 210 protrudes on the opposite side to the sliding plate 211 of the beam 210 of the jack-up device 200 on the front side of the vehicle M1. And when setting the jackup apparatus 200 arrange | positioned at the back side of the vehicle M1 to an overhanging position, the lock pin 420 is penetrated to the locking hole 312d of the jackup support member 310. As shown in FIG.
In order to set the jack-up device 200 to the retracted position, the lock pin 420 may be inserted into the lock hole 312b of the jack-up support member 310, as is apparent with reference to FIG.

  By forming the locking holes 310b to 310d in the jack-up support member 310, the jack-up support member 310 can be shared for mounting the jack-up devices 200 before and after the vehicle M1.

When attaching the attachment such as the boom 4 to the upper swing body 3, if the attachment is extended to the jack-up device 200 set to the extended position, the falling moment can be increased and a heavy boom attached to the heavy weight is attached. Work can be done safely and quickly.
The overturning fulcrum Sf in the forward direction or the backward direction of the vehicle M1 is a boundary between the ground contact position and the takeoff position in the foremost lower roller 113a or the rearmost lower roller 113b (see FIG. 2).
Further, the overturning fulcrum Sw in the width direction of the vehicle M1 is the center of the ground contact surface of the float 220 of the jack-up device 200 at the overhang position (see FIG. 2).
Therefore, in the present embodiment, the distance between the center of gravity of the vehicle M1 and the overturning fulcrum Sf of the jack-up device 200 at the extended position is set larger than the distance between the center of gravity of the vehicle M1 and the overturning fulcrum Sw in the front or rear. It is. Thereby, the assembly | attachment of the attachment from the jackup apparatus 200 side set to the overhang position can be performed safely and rapidly.

When the jack-up device 200 is in the retracted state, a gap CL ₁ is set between the side surface of the side frame 109 and the outer periphery of the float 220 as shown in FIG.

FIG. 9 is a view for explaining the positional relationship between the float and the crawler when the jack-up device is in the retracted position.
The float 220 is attached to the tip of the beam 210 so as to be movable up and down.
In the retracted state jack-up apparatus 200, the float 220 at a position raised to the maximum, between the ground plane and the crawler belt 108 of the float 220, is set so that the clearance CL ₂ is formed.

As described above, in the retracted state jack-up device 200, between the outer side and the float 220 of the side frame 109, it is set clearance CL _1, and, at a position to raise the float 220 to the maximum, between the ground plane and the crawler belt 108 of the float 220, it is set so that the clearance CL ₂ is formed.
For this reason, even if the jackup device 200 is stored and the vehicle M1 is run or the load work is performed and vibrations and impacts occur, the jackup device 200 and the crawler 110 are prevented from colliding. be able to.

[Jack-up device assembly method]
FIG. 10 is a flowchart showing a method of mounting the jack-up device on a vehicle with no attachment.
In order to assemble the jackup device 200 to the crawler crane, a vehicle with no attachment is prepared in step S1.
The vehicle with no attachment includes the lower traveling body 1 having the upper revolving body 3 to which the attachment such as the boom 4 is not attached and the pair of traveling apparatuses 104 to which the jackup device 200 is not attached.
A jack-up support member 310 is attached to each traveling device 104 in front of and behind the center of gravity of the vehicle M1. The jack-up support member 310 is attached in the following procedure.
The engagement groove 314 of the jackup support member 310 is engaged with the locking pin 121 of the side wall 120 of the side frame 109, and in this state, the through hole of the side wall 120 and the through hole of the jackup support member 310 are aligned, This is done by inserting the fixing pin 401 (see FIG. 7).

In step S <b> 2, the jackup device 200 is attached to each jackup support member 310.
The method for attaching the jackup device 200 to the jackup support member 310 is as described above. That is, the rotation support shaft 410 is inserted through the shaft hole 312a of the upper plate 312 of the jackup support member 310, the shaft hole 210a of the beam 210 of the jackup device 200, and the shaft hole 313a of the lower plate 313. The lower end side of the rotation support shaft 410 is prevented from coming off by a stop pin 413 (see FIG. 7).

  In step S3, the jack-up device 200 is rotated to the retracted position, and the locking hole of the beam 210 is aligned with the locking hole 312b of the jack-up support member 310.

  In step S4, the jackup device 200 is locked in the storage position. That is, the lock pin 420 is inserted into the lock hole 312 b of the jack-up support member 310 and the lock hole of the beam 210, and the lock pin 420 is prevented from coming off by the retaining pin 421.

[Assembly of attachment]
FIG. 11 is a flowchart showing a method of assembling the attachment to the vehicle equipped with the jack-up device.
In order to assemble the attachment such as the boom 4, a vehicle equipped with the jackup device 200 is prepared in step S11. A vehicle equipped with the jack-up device 200 is a vehicle in which step S4 is completed.
In step S12, the lock pin 420 that locks the jack-up device 200 in the retracted position is removed.

In step S <b> 13, the jackup device 200 is rotated to the extended position, and the locking hole of the beam 210 is aligned with the locking hole 312 c or 312 d of the upper plate 312 of the jackup support member 310.
In step S14, the jack-up device 200 is locked at the extended position. That is, the lock pin 420 is inserted into the lock hole of the beam 210 and the lock hole 312c or 312d of the upper plate 312 of the jack-up support member 310.

In step S15, the attachment such as the boom 4 is disposed so as to extend to the jack-up device 200 side locked in the extended position, and is assembled to the upper swing body 3.
In step S16, attachment of the boom 4 or the like is caused.

In step S17, the lock pin 420 that locks the jack-up device 200 in the extended position is removed.
In step S18, the jack-up device 200 is rotated to the retracted position, and the locking hole of the beam 210 is aligned with the locking hole 312b of the jack-up support member 310.

In step S19, the jack-up device 200 is locked in the storage position.
If it will be in this state, it will become possible to drive | work a crawler crane or drive attachments, such as boom 4, and to perform work, such as a suspended load.
Next, a method for disassembling and transporting the attachment such as the boom 4 and the jack-up device 200 will be described.

[Disassembly method of attachment and jack-up device]
FIG. 12 is a flowchart showing a method of disassembling and transporting the attachment and the jack-up device.
In step S21, an attachment-equipped vehicle is prepared. This process is a vehicle in a state where the above-described step S19 is completed.
In step S22, the lock pin 420 that locks the jack-up device 200 in the retracted position is extracted.

In step S23, the jack-up device 200 is rotated to the extended position, and the locking hole of the beam 210 is aligned with the locking hole 312c or 312d of the upper plate 312 of the jack-up support member 310.
In step S24, the jack-up device 200 is locked at the extended position. That is, the lock pin 420 is inserted into the lock hole of the beam 210 and the lock hole 312c or 312d of the upper plate 312 of the jack-up support member 310.

  In step S25, the attachment such as the boom 4 is tilted to the jack-up device 200 set at the overhang position and disassembled. The disassembled attachment such as the boom 4 is lifted by an auxiliary crane and mounted on a transportation vehicle for transportation.

In step S26, the lock pin 420 that locks the jack-up device 200 in the extended position is removed.
In step S <b> 27, the rotation support shaft 410 connecting the jackup device 200 to the jackup support member 310 is extracted.
In step S28, the jack-up device 200 is lifted by an auxiliary crane, if necessary, and transported by being mounted on a transportation vehicle.

According to the one embodiment, the following effects are obtained.
(1) The jack-up support member 310 attached to the side frame 109 of the crawler 110 is provided with a jack-up device 200 so as to be rotatable, and the storage position stored in the vicinity of the crawler 110 and the extended position almost orthogonal to the storage position Enabled to set. For this reason, every time the attachment is attached to the crawler crane, or when the crawler crane is run or the work is performed by the crawler crane, it is possible to eliminate the trouble of attaching and detaching the jack-up device 200, thereby improving the work efficiency. be able to.
(2) The distance between the center of gravity of the vehicle M1 and the overturning fulcrum Sf of the jack-up device 200 at the extended position is set larger than the distance between the center of gravity of the vehicle M1 and the overturning fulcrum Sw in the front or rear. For this reason, when attaching a heavy attachment such as the long boom 4 to the upper swing body 3, even if the attachment is extended to the jack-up device 200 side, the possibility of falling can be eliminated. Assembly work can be performed safely and quickly.

(3) The side end surface of the crawler belt 108 where the shaft hole 312a of the upper plate 312 and the shaft hole 313a of the lower plate 313 of the jack-up support member 310 are positioned so that the crawler 110 does not obstruct the loading / unloading operation of the rotation support shaft 410. Arranged outside 108a. For this reason, the attachment work to the jackup support member 310 of the jackup apparatus 200 can be performed efficiently.
(4) The locking holes 312b to 312d of the upper plate 312 of the jack-up support member 310 are disposed outside the side end surface 108a of the crawler belt 108 where the crawler 110 does not obstruct the mounting and dismounting operation of the lock pin 420. did. For this reason, when the jack-up device 200 is locked at the retracted position and the extended position, the lock pin 420 can be efficiently attached and detached.

(5) a jack-up device 200, in the storage state, the clearance CL ₁ is formed between the outer side and the float 220 of the side frame 109, and a float 220 at a position raised to the maximum, the float 220 and a gap CL ₂ is formed between the ground plane and the crawler belt 108. For this reason, even if the jackup device 200 is stored and the vehicle M1 is run or the load work is performed and vibrations and impacts occur, the jackup device 200 and the crawler 110 are prevented from colliding. be able to.

(6) A shaft hole 312a for inserting the rotation support shaft 410 in the jack-up support member 310 and locking holes 312b to 312d for inserting the lock pin 420 are provided, and the locked state is set at the retracted position and the extended position. The lock structure is For this reason, the jackup apparatus 200 can be reliably held at the storage position and the extended position, and safety can be improved.
(7) In the above locking structure, the jack-up support member 310 is provided with locking holes 312b and 312c for locking the jack-up device 200 arranged in both the front and rear directions of the crawler crane in the extended position. For this reason, the jack-up support member 310 can be shared for mounting the jack-up device 200 in both the front and rear directions, and the cost can be reduced and the workability can be improved due to the common use of parts.

(8) In the above-described lock structure, the sliding plate 211 that forms a lock hole through which the lock pin 420 is inserted is bent to the opposite side to the rotation direction of the jackup device 200. That is, the sliding plate 211 is not formed on the rotation direction side of the jackup device 200. For this reason, in order to prevent the sliding plate 211 from coming into contact with the side frame 109 and hindering the rotation of the jack-up device 200 or to contact the sliding plate 211 with the side frame 109, There is no need to provide a useless space with the side frame 109.

In the above embodiment, the extension position of the jack-up device 200 is exemplified as a structure set in a direction substantially orthogonal to the storage position. However, the extension position of the jack-up device 200 may be set to an angle smaller than or larger than the storage position.
Further, the storage positions may be set not at one place but at a plurality of places.

  In the above-described embodiment, the jack-up device 200 is illustrated as being equipped with the float 220 that moves up and down with respect to the beam 210. However, the jack-up device 200 may not be equipped with the float 220. In such a structure, a ground plate made as a separate member may be detachable from the tip side of the jack-up device 200 in the overhang position.

  The beam 210 of the jack-up device 200 may have a multistage structure that can be expanded and contracted.

  In the above embodiment, the crawler crane is exemplified as the vehicle. However, the present invention can also be applied to other crawler work vehicles such as a crawler excavator.

  In addition, the crawler type work vehicle of the present invention can be variously modified within the scope of the invention. In short, the jack-up device attached to the traveling device so as to be able to rotate is a storage position, It is possible to set to the overhang position, and the distance between the center of gravity of the vehicle and the fall fulcrum of the jack-up device at the overhang position may be larger than the distance between the center of gravity of the vehicle and the overturn fulcrum at the front or rear. .

DESCRIPTION OF SYMBOLS 1 Lower traveling body 3 Upper revolving body 4 Boom 104 Traveling apparatus 108 Crawler belt 108a Side end surface 109 Side frame 110 Crawler 112 Upper roller 113 Lower roller 113a Lower roller (frontmost part)
113b Lower roller (last part)
120 Side wall 121 Locking pin 200 Jack-up device 210 Beam 211 Branch portion 220 Float 310 Jack-up support member 311 Main body 312 Upper plate 312a Shaft hole 312b-312d Locking hole 313 Lower plate 314 Engaging groove 410 Rotating support shaft 420 Lock pin CL ₁ , CL ₂ gap M ₁ Vehicle Sf, Sw Falling fulcrum

Claims (5)

An upper swing body to which the attachment is attached;
A lower traveling body having a pair of traveling devices each having a side frame and a crawler belt;
A pair of jack-up devices attached to each of the pair of travel devices and arranged in the front-rear direction in the travel direction;
A jack-up support member provided on the side frame of the traveling device and supporting each jack-up device;
The jack-up device is
It is rotatably attached to the jack-up support member, and is set to a retracted position extending in the traveling direction on the side of the side frame and an overhanging position extending in a direction intersecting the traveling direction. Equipped with a beam
A crawler type work vehicle, wherein an interval between a center of gravity of the vehicle and a fall fulcrum of the jack-up device at the extended position is larger than an interval between the center of gravity of the vehicle and a fall fulcrum at the front or rear of the lower traveling body. The crawler work vehicle according to claim 1,
A crawler-type work vehicle, wherein a rotation fulcrum of the beam rotatably attached to the jack-up support member is located outside a side end surface of the crawler belt. In the crawler type work vehicle according to claim 1 or 2,
The crawler work vehicle further includes a lock mechanism that locks the jack-up support member and the beam at the retracted position and the extended position. In the crawler type work vehicle according to claim 3,
The jack-up device further includes a float attached to the tip of the beam so as to be movable up and down,
In the retracted position, the float is separated from the side surface of the side frame. An upper turning body and a lower traveling body are provided, and a vehicle in which a pair of jack-up support members arranged in front and rear in the traveling direction is provided in each of the pair of traveling devices of the lower traveling body,
A jack-up device is rotatably attached to each of the jack-up support members,
Each jack-up device is set to an overhang position that extends in a direction intersecting the traveling direction,
The upper revolving unit is assembled with the attachment extending in a direction substantially perpendicular to the traveling direction,
Causing the attachment on the upper swing body,
Set the jack-up device in the storage position,
Start working with the attachment;
Assembly method of crawler type work vehicle.

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