JP2017065879A - Assembling method of moving crane and dismantling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a wide occupation space for installing a large-sized auxiliary crane.SOLUTION: An assembling method of a moving crane includes: a process for telescoping a multistage boom so that a base end of the multistage boom approximates a turning body by supplying pressurized oil to a telescopic actuator of the multistage boom placed on a cargo-loading platform of a transportation vehicle: a process for lifting the base end of the multistage boom by a base end side lift device arranged at the turning body, and inserts a foot pin into a pin insertion hole of the multistage boom and a pin insertion hole of the turning body in a state that a tip of the multistage boom is lifted by a tip side lift device arranged at the cargo-loading platform of the transportation vehicle; and a process for separating the multistage boom from the cargo-loading platform of the transportation vehicle by erecting the multistage boom by an erecting device with the foot pin as a pivot.SELECTED DRAWING: Figure 16

Description

  The present invention relates to a method for assembling and disassembling a mobile crane.

  A crane is known that includes a traveling body, a revolving structure, and a multistage boom that is rotatably supported by the revolving structure (see Patent Document 1).

JP 2006-137558 A

  When transporting a mobile crane, it may be transported after being disassembled into a swivel body and a boom due to transportation restrictions. In this case, after the revolving unit and the boom are respectively carried into the work site, the boom is attached to the revolving unit again. In the crane described in the above-mentioned patent document, it is necessary to hang the boom with a large auxiliary crane at the time of disassembling work before transportation for removing the boom from the revolving structure or assembly work after transportation for attaching the boom to the revolving structure. Since a large auxiliary crane is arranged, a large occupied space is required at the time of disassembling and assembling the swing and the boom.

  A method for assembling a mobile crane according to the present invention includes a traveling body, a revolving body that is turnably provided on the traveling body, and a multistage boom that is attached to the revolving body by a hoisting device with a foot pin as a fulcrum. A method for assembling a mobile crane, by supplying pressure oil to a telescopic actuator for a multi-stage boom placed on the platform of a transport vehicle so that the base end of the multi-stage boom approaches the swivel body The step of extending the multistage boom, the base end of the multistage boom is lifted by the base end side lifting device provided on the revolving structure, and the front end of the multistage boom is provided on the loading platform of the transport vehicle With the lifting device lifted, the multistage boom pin is inserted into the pin insertion hole of the multi-stage boom, the step of inserting the foot pin into the pin insertion hole of the revolving structure, and the hoisting device is used to stand the multistage boom with the foot pin as a fulcrum. A step of separating from the bed of the transport vehicle Te containing.

  According to the present invention, since a large auxiliary crane for hanging the boom is not required, a large occupied space for arranging the large auxiliary crane is not required.

Side view of the crane. The perspective view of a crane in the state where the boom was removed. (A) is a perspective view which shows the trailer in the state in which the boom was mounted, (b) is a perspective view which shows the trailer in the state in which the boom is not mounted. The figure which shows the base end vicinity of a base boom. The perspective view which shows the boom head fixed to the boom fixing | fixed part of the mount for front side boom transportation. The perspective view of a base end side suspension apparatus. The figure explaining the attachment part of the support stand in a main frame, and the attachment part of the chain block in a boom. The figure which looked at the base end side suspension apparatus from the right side of the crane. The figure which looked at the base end side suspension apparatus from the front side of the crane. The disassembled perspective view which shows each component which comprises a base end side suspension apparatus. The perspective view of the front end side suspension apparatus of the state which suspended the front-end | tip part of the boom. The figure which looked at the front end side suspension apparatus from the front side of the crane. The perspective view of a front end side suspension apparatus. The disassembled perspective view which shows each component which comprises a front end side suspension apparatus. The perspective view of the state which lifted the front end side suspension apparatus with the auxiliary crane. The flowchart which shows the assembly procedure of a crane. The figure explaining the assembly operation | work of a crane main body and a boom. The figure explaining the assembly operation | work of a crane main body and a boom. (A) is a side view showing the boom fixing part in a state where the shaft fixing link is attached to the shaft supporting part, and (b) is a side view showing the boom fixing part in a state where the shaft fixing link is removed from the shaft supporting part. (A) is a perspective view which shows the boom fixing | fixed part of the state in which the axis | shaft fixing link was attached to the axis | shaft support part, (b) is a perspective view which shows the boom fixing | fixed part of the state where the axis | shaft fixing link was removed from the axis | shaft support part. The flowchart which shows the disassembly procedure of a crane. The schematic diagram of the front end side suspension apparatus which concerns on the modification 2. FIG. The schematic diagram of the front end side suspension apparatus which concerns on the modification 3. FIG.

Hereinafter, an embodiment of a method for assembling and disassembling a mobile crane according to the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a mobile crane (hereinafter simply referred to as a crane 10), and FIG. 2 is a perspective view of the crane 10 with the boom 4 removed. FIG. 3A is a perspective view showing the trailer 90 in a state where the boom 4 is placed, and FIG. 3B is a perspective view showing the trailer 90 in a state where the boom 4 is not placed. In FIG. 1, illustrations of a hook for hanging a load and a hook rope connected to a hook and a winch provided on the crane body 11 are omitted. In FIG. 2, illustration of the traveling body 1 and the cab (cab) is omitted for convenience of explanation, and illustration of the tractor head is omitted in FIG. 3. In the following, as shown in the figure, the vertical and front-rear and left-right directions of the crane 10 are defined in the posture in which the boom 4 is laid down.

  As shown in FIG. 1, the crane 10 includes a crane main body 11 and a boom 4 attached to the swing body 3 of the crane main body 11 so as to be raised and lowered. The crane main body 11 includes a traveling body 1 and a revolving body 3 that is turnably provided on an upper portion of the traveling body 1 via a swirling wheel. The traveling body 1 has a track frame (not shown) and side frames 1a provided on the left and right sides of the track frame, and an endless track (crawler belt) 1b is attached to the side frame 1a.

  As shown in FIG. 2, the revolving structure 3 includes a main frame 3a, and a rectangular box-shaped building cover 80 is fixed to the main frame 3a. A plurality of winches (not shown) are mounted on the main frame 3a.

  The main frame 3a is provided with a pair of left and right boom mounting portions 31 that pivotally support the boom 4 in a rotatable manner. Each boom attachment portion 31 is a portion that supports a foot pin 81, and each boom attachment portion 31 is provided with a foot pin insertion hole 31a into which the foot pin 81 is inserted extending in the left-right direction. The foot pin 81 is a shaft-like member that pivotally supports the boom 4 so as to be rotatable by the boom mounting portion 31 of the main frame 3a. A hydraulic cylinder (hereinafter referred to as a boom cylinder 7) constituting a hoisting device for hoisting the boom 4 is attached to the main frame 3a.

  As shown to Fig.3 (a), the boom 4 is a multistage boom, ie, the telescopic boom which can be expanded-contracted. The boom 4 is a multi-stage boom having at least two stages of a boom on the proximal end side and a boom on the distal end side that can be expanded and contracted with respect to the boom on the proximal end side. The boom 4 is a boom on the base end side of the multi-stage boom and is a base boom 41 which is an outermost outer cylinder, and is accommodated so as to be extendable (movable) in the length direction on the inner peripheral side of the base boom 41. And a plurality of stages of inner cylinders 45. At the base end of the base boom 41, a foot pin insertion hole 41a into which the foot pin 81 is inserted is provided so as to extend in the left-right direction. When the foot pin 81 is inserted into the foot pin insertion hole 31a (see FIG. 2) of the boom mounting portion 31 and the foot pin insertion hole 41a (see FIG. 3 (a)) of the base boom 41, as shown in FIG. The boom 4 is attached to the main frame 3a so that it can be raised and lowered by the boom cylinder 7 with the foot pin 81 as a fulcrum.

  A cylinder rod mounting portion 42 to which a tip 74 (see FIG. 2) of the cylinder rod of the boom cylinder 7 is mounted is provided on the abdominal surface of the base boom 41, that is, the surface facing the ground surface of the base boom 41 that has been laid down. Yes. The cylinder rod mounting portion 42 is provided with a cylinder pin insertion hole 42a (see FIG. 3A) into which a cylinder pin is inserted.

  As shown in FIG. 2, a cylinder pin insertion hole 74 a for inserting a cylinder pin is provided at the tip 74 of the cylinder rod of the boom cylinder 7. The cylinder pin is a shaft-like member for connecting the cylinder rod mounting portion 42 and the tip 74 of the cylinder rod of the boom cylinder 7 and is inserted into the cylinder pin insertion hole 42a and the cylinder pin insertion hole 74a.

  As shown in FIG. 3 (a), a boom head 46, which is the distal end portion of the inner cylinder 45 located on the most distal side among the plurality of stages of inner cylinders 45, has a plurality of winding ropes (not shown) wound around it. A sheave is provided. A guide sheave 47 is disposed on the back side (upper side) of the boom head 46. The support shaft 47 a that supports the guide sheave 47 is provided so that both ends protrude from both sides of the boom head 46. A top sheave 48 (see FIG. 1) is disposed on the abdominal surface side (lower side) of the boom head 46. The support shaft 48 a that supports the top sheave 48 is provided so that both ends protrude from both sides of the boom head 46. Each of the support shafts 47 a and 48 a is fixed to the boom head 46. An auxiliary hook sheave 49 is disposed on the front side of the boom head 46. The auxiliary hook sheave 49 is supported by a support member fixed to the boom head 46 at a position ahead of the top sheave 48.

  As shown in FIG. 3A, a pair of suspension brackets 141 are provided at both left and right end portions of the base end portion of the boom 4. The suspension bracket 141 includes a fixing portion that is fixed to the base end portion of the boom 4 and a triangular protruding portion that protrudes upward from the upper surface (back surface) of the boom 4. The projecting portion has a flat plate shape, and a bolt insertion hole 141a through which a bolt (see FIG. 6) of a shackle 59 attached to a lower hook 50d of the chain block 50 described later is provided in the vicinity of the top portion.

  FIG. 4 is a view showing the vicinity of the base end of the base boom 41. 4A is a cross-sectional view of the base boom 41 in the vicinity of the base end when viewed from the base end side, and FIG. 4B is a view of the base boom 41 in the vicinity of the base end viewed from the side. FIG. 4 shows a state in which the boom 4 is laid down so that the extending direction of the boom 4 is horizontal, as in the posture of FIG.

  The boom 4 is provided with a hydraulic cylinder 70 for expanding and contracting the inner cylinder 45 positioned closest to the base end side with respect to the base boom 41, and hydraulic cylinders 71 and 72 for expanding and contracting adjacent inner cylinders 45 to each other. It has been. The hydraulic cylinders 70 to 72 are supplied with pressure oil from the crane body 11 via hydraulic hoses (not shown) in order to extend and contract the boom 4. A connection portion 76 of a hydraulic hose (not shown) is provided in the vicinity of the base end of the base boom 41, and the crane main body 11 is connected via a hydraulic hose (not shown) connected to the connection portion 76 during crane work. Pressure oil is supplied from a hydraulic source.

  In the boom 4 of the present embodiment, as will be described later, the base boom 41 is expanded and contracted when the crane body 11 and the boom 4 are disassembled and assembled. At that time, pressure oil is supplied to the hydraulic cylinders 70 to 72 from a hydraulic source (not shown) of the crane body 11 via a hydraulic hose (not shown) dedicated to disassembly and assembly. Therefore, in the vicinity of the base end of the base boom 41, a connecting portion 77 for connecting a hydraulic hose (not shown) dedicated to disassembly and assembly, which is different from the connecting portion 76 described above, is provided. The connecting portion 77 includes a connecting portion 77a that supplies pressure oil for extending the hydraulic cylinders 70 to 72, and a connecting portion 77b that supplies pressure oil for retracting the hydraulic cylinders 70 to 72.

  By the way, the crane 10 is disassembled into the crane main body 11 and the boom 4 due to restrictions on transportation weight, length, and the like, respectively transported separately, and assembled at the work site.

  As shown in FIG. 3B, the trailer 90, which is a transport vehicle, is provided with a boom transport fixing device 100. The boom transport fixing device 100 includes a front boom transport base 101A, a rear boom transport base 101B, and a base connecting member 101C that connects the front boom transport base 101A and the rear boom transport base 101B. ing. The front boom transport base 101A is provided with a boom fixing part 110, and the rear boom transport base 101B is provided with a front boom slide part 120A and a rear boom slide part 120B. The front boom transportation platform 101A and the rear boom transportation platform 101B are respectively placed on a loading platform 91 of a trailer 90 and fixed to the loading platform 91 by, for example, a wire rope.

  FIG. 5 is an enlarged perspective view showing the front end side of the boom 4 in FIG. 3, and shows the boom head 46 fixed to the boom fixing part 110 of the front boom transport base 101A. As shown in FIG. 5, the boom fixing portion 110 is a fixing portion for fixing the boom head 46 to the front boom transport base 101 </ b> A, and includes a pair of left and right shaft support portions 111 and a pair of left and right shaft support portions 111. The shaft fixing link 112 attached to each is provided. The pair of left and right shaft support portions 111 have the same shape. The shaft support portion 111 is disposed so as to be located outside the extending direction of the support shaft 48 a protruding from both side surfaces of the boom head 46, that is, the width direction of the boom 4 that is the left-right direction of the crane 10.

  At the upper end of the shaft support 111, a bearing recess 111 a is lowered in the vicinity of the center in the front-rear direction so as to receive and support the support shaft 48 a protruding from the side of the boom head 46 from below. Is formed. As shown in FIG. 14, insertion holes through which the fixing pins 113 are inserted are provided on the front and rear side plates that constitute the front and rear side surfaces of the bearing recess 111 a of the shaft support portion 111. When the fixing pin 113 is inserted into the insertion hole, the shaft fixing link 112 is fixed to the shaft support portion 111 by the fixing pin 113.

  The shaft fixing link 112 is a plate-like member that is attached to the upper portion of the shaft support portion 111 and sandwiches the support shaft 48 a with the bearing recess 111 a of the shaft support portion 111. Insertion holes through which the above-described fixing pins 113 are inserted are provided at both front and rear end portions of the shaft fixing link 112.

  A plastic backing plate 114 is provided at the lower end of the shaft fixing link 112, and a plastic backing plate 115 (see FIG. 19A) is provided on the bottom surface of the bearing recess 11a. That is, the support shaft 48a is fixed in a state of being sandwiched between the bearing recess 111a and the shaft fixing link 112 via the contact plates 114 and 115.

  As shown in FIG. 5, when the shaft fixing link 112 is fixed to the upper portion of the shaft support portion 111 by the fixing pin 113, the boom fixing portion 110 is located between the bearing recess 111 a of the shaft support portion 111 and the shaft fixing link 112. Thus, the support shaft 48a is held (see FIG. 19A), and the boom head 46 is fixed.

  As described above, the support shaft 48a is fixed by the bearing recess 111a (see FIG. 19 (a)) and the shaft fixing link 112 via the contact plates 114 and 115, but the metal support shaft 48a and the plastic are provided. The friction coefficient between the contact plates 114 and 115 made of metal is smaller than the friction coefficient when the contact plates 114 and 115 are made of metal. For this reason, the support shaft 48a can be rotated by sliding on the surfaces of the contact plates 114 and 115, and the boom head 46 rotates around the support shaft 48a sandwiched between the contact plate 114 and the contact plate 115. It is possible to move. That is, even if the support shaft 48a of the boom head 46 is fixed by the boom fixing portion 110, the base boom 41 is allowed to swing around the support shaft 48a.

  As shown in FIG. 3B, the front boom slide part 120A and the rear boom slide part 120B are provided on the rear boom transport base 101B so as to be separated in the front-rear direction.

  The front boom slide portion 120A and the rear boom slide portion 120B have the same structure and are each provided with a slide roller 127. The slide roller 127 supports the boom 4 so as to be slidable in the front-rear direction by contacting the abdominal surface of the base boom 41. The front boom slide portion 120A and the rear boom slide portion 120B are configured so that the slide roller side (upper side) frame is mounted on the gantry side (lower side) with a pin 125 disposed so as to extend in the front-rear direction. ) With respect to the frame and open outwardly from the left and right. With such a configuration, when the boom 4 is expanded and contracted on the slide roller 127, it is possible to appropriately avoid interference with the constituent members of the boom 4.

  As shown in FIG. 3A, the boom 4 mounted on the boom transportation fixing device 100 is attached to the main frame 3a (see FIG. 2) of the revolving structure 3 by an assembly method described later. As shown in FIG. 17, in the assembling method described later, the boom 4 is lifted at the base end portion by the base end side suspension device 5 and is lifted by the tip end side suspension device 6. Thereby, adjustment of the position of the boom 4 with respect to the turning body 3 becomes easy, and the boom 4 can be easily connected to the turning body 3.

  With reference to FIGS. 6-10, the base end side suspension apparatus 5 is demonstrated. FIG. 6 is a perspective view of the proximal end side suspension device 5. FIG. 7 is a view in which the support base 51 and the chain block 50 are not shown in FIG. 6, and is a view for explaining the attachment portion of the support base 51 in the main frame 3 a and the attachment portion of the chain block 50 in the boom 4. . FIG. 8 is a view of the base end side suspension device 5 as viewed from the right side of the crane 10, and FIG. 9 is a view of the base end side suspension device 5 as viewed from the front side of the crane 10. FIG. 10 is an exploded perspective view showing components constituting the proximal end side suspension device 5. In addition, each component which comprises the base end side suspension apparatus 5 is formed so that it may be less than 20 kg.

  As shown in FIG. 6, when the boom 4 is attached to the main frame 3a or when the boom 4 is detached from the main frame 3a, the base end side lifting device 5 that lifts the base end portion of the boom 4 is attached to the main frame 3a. Is attached. The base end side suspension device 5 includes a pair of left and right chain blocks 50L and 50R that support the base end portion of the boom 4 so as to be lifted and lowered, and a support base 51 that supports the pair of chain blocks 50L and 50R. . The pair of chain blocks 50L and 50R can be operated independently. Hereinafter, the proximal end side suspension device 5 will be described in detail.

  The chain block 50L and the chain block 50R have the same configuration, and are hereinafter collectively referred to as the chain block 50. The chain block 50 includes an upper hook 50a for attachment to the support base 51, a main body 50b, a load chain (not shown), a lower hook 50d for attachment to the boom 4, and a hand chain (not shown). In addition, it is a well-known suspended chain block. Although not shown, the main body 50b is provided with a load sheave (also referred to as a road wheel) and a hand chain wheel (also referred to as a hand wheel) on the same axis.

  The support base 51 includes two support columns 152 that are open in an inverted V shape on each of the left and right sides. The two support columns 152 that are open in an inverted V shape are connected to each other at the upper end portion by a support bracket 151.

  As shown in FIG. 10, the support bracket 151 is a triangular plate-like member in a side view. The support bracket 151 is formed with a U-shaped recess 151c at the center in the front-rear direction. The support bracket 151 is provided with a pin insertion hole 151h through which the connecting pin 155 is inserted at a predetermined interval X1 on both front and rear sides of the recess 151c.

  As shown in FIG. 6, the lower ends of the two columns 152 fixed by one support bracket 151 are fixed to the support base bracket 135. As shown in FIG. 7, the support bracket 135 is an inverted U-shaped flat plate member when viewed from the side, and includes a horizontal portion 135a extending in the front-rear horizontal direction and both front and rear end portions of the horizontal portion 135a. And a mounting portion 135b extending downward. The support bracket 135 has a mounting portion 135b welded to the upper end surface of the boom mounting portion 31 of the main frame 3a. The horizontal portion 135a is provided with a pin insertion hole 135h through which the connecting pin 156 (see FIGS. 6 and 10) is inserted with a predetermined interval X2 on both the front and rear sides.

  As shown in FIG. 6, among the four support columns 152, the pair of left and right support columns 152 arranged on the rear side are connected by two support pipes 153 and diagonal members 154. As shown in FIG. 10, one of the two support pipes 153 is welded in the vicinity of the upper end of each of the pair of left and right columns 152, and the other of the two support pipes 153 is a pair of left and right columns. Each of 152 is welded in the vicinity of the lower end. The two support pipes 153 are arranged in parallel to the central axis direction of the foot pin 81, that is, the width direction of the boom 4.

  One end of the diagonal member 154 is welded to the vicinity of the upper end portion of the support column 152 disposed on the right side, and the other end is welded to the vicinity of the lower end portion of the support column 152 disposed on the left side. When the pair of left and right support columns 152 on the rear side are connected by the support pipe 153 and the diagonal member 154, a welded structure in which the components are integrated is formed. This welded structure is one component constituting the proximal end side suspension device 5 and has a mass of less than 20 kg as described above.

  As shown in FIG. 10, a bifurcated connecting portion having a bifurcated connecting plate is provided at both ends of the support column 152. A support bracket 151 is inserted into a bifurcated connecting portion (hereinafter referred to as an upper bifurcated connecting portion 152U) provided at the upper end of the support column 152. A support bracket 135 (see FIGS. 6 and 7) is inserted into a bifurcated connection portion (hereinafter referred to as a lower bifurcated connection portion 152L) provided at the lower end of the support column 152.

  The upper bifurcated connecting portion 152U is provided with a circular pin insertion hole 152h through which the connecting pin 155 is inserted. The lower bifurcated connecting portion 152L is provided with a circular pin insertion hole 152h through which the connecting pin 156 is inserted.

  By inserting the connecting pin 155 into the pin insertion hole 152h of the upper bifurcated connection portion 152U and the pin insertion hole 151h of the support bracket 151, the upper bifurcated connection portion 152U and the support bracket 151 are connected. The connection pin 155 is provided with an end plate having a diameter larger than that of the pin insertion holes 151h and 152h at one end and a through hole through which a stop pin such as a pine needle pin is inserted at the other end.

  By inserting the connecting pin 156 into the pin insertion hole 152h of the lower bifurcated connection portion 152L and the pin insertion hole 135h of the support bracket 135, the lower bifurcated connection portion 152L and the support bracket 135 are coupled. The connection pin 156 is provided with an end plate having a diameter larger than that of the pin insertion holes 135h and 152h at one end and a through hole through which a stop pin such as a pine needle pin is inserted at the other end.

  As shown in FIG. 10, the bar 150 is a columnar bar-shaped member. At both ends of the cylindrical portion 150a of the bar 150, an annular drop-off preventing plate 150c having a diameter longer than the front-rear width dimension of the recess 151c is disposed. An annular positioning plate 150d having a diameter larger than that of the columnar portion 150a of the bar 150 is provided at a position away from the dropout prevention plate 150c by a predetermined distance. As shown in FIG. 9, the dimension Y1 between the left side surface of the left positioning plate 150d and the right side surface of the right positioning plate 150d is substantially the same as the left and right width dimension Y2 of the base end portion of the boom 4. (Y1≈Y2).

  As shown in FIG. 6, when the bar 150 is placed in the recesses 151c (see FIG. 10) of the left and right support brackets 151, the bar 150 is suspended horizontally by the pair of left and right support brackets 151. The bar 150 is arranged so as to be parallel to the central axis direction of the foot pin 81.

  As shown in FIG. 8, the distance X2 that is the inter-pin distance of the connecting pins 156 is set to be larger than the distance X1 that is the inter-pin distance of the connecting pins 155. An arrangement space is defined. The interval X1 and the interval X2 prevent the support pipe 153 and the diagonal member 154 from interfering with the rear surface of the main body 50b of the pair of chain blocks 50R, 50L when the pair of chain blocks 50R, 50L are arranged in this arrangement space. Is set to be.

  As shown in FIG. 9, the right chain block 50R is disposed such that the upper hook 50a contacts the right side surface of the right positioning plate 150d. The left chain block 50L is arranged such that the upper hook 50a contacts the left side surface of the left positioning plate 150d. Thereby, the point P1 which supports the upper hook 50a of the chain block 50 in the bar 150 and the point P2 where the shackle 59 attached to the chain block 50 supports the suspension bracket 141 can be positioned on the vertical line. Thereby, compared with the case where the point P1 and the point P2 cannot be positioned on the vertical line, the load acting on the chain block 50 can be reduced, so that the chain block 50 and the support base 51 can have a simple structure. can do. As a result, the manufacturing cost of the base end side suspension device 5 can be reduced.

  With reference to FIGS. 11-15, the front end side suspension apparatus 6 is demonstrated. 11 is a perspective view of the tip-side suspension device 6 in a state where the tip portion of the boom 4 is suspended, and FIG. 12 is a view of the tip-side suspension device 6 shown in FIG. FIG. 13 is a perspective view of the front end side suspension device 6, and FIG. 14 is an exploded perspective view showing each component constituting the front end side suspension device 6. FIG. 15 is a perspective view of the state in which the tip side suspension device 6 is lifted by an auxiliary crane.

  As shown in FIGS. 11 and 12, the tip-side suspension device 6 is attached to a pair of left and right attachment frames 120 provided on the front boom transport base 101 </ b> A, and is trailered by a wire sling 92 and a lever block (registered trademark) 93. It is secured to 90 loading platforms 91.

  As shown in FIG. 5, each mounting frame 120 includes a pair of vertical plates 120 a and a pair of horizontal plates 120 b that connect the pair of vertical plates 120 a to each other. The pair of vertical plates 120a and the pair of horizontal plates 120b are respectively suspended from the base of the front boom transport base 101A. The pair of vertical plates 120a is a flat plate-like member extending in the front / rear vertical direction, and the pair of horizontal plates 120b is a flat plate member extending in the left / right vertical direction.

  The rectangular region in plan view surrounded by the pair of vertical plates 120a and the pair of horizontal plates 120b is a region into which a column 161 of the distal end side suspension device 6 described later is inserted, and is a rectangular parallelepiped matched to the rectangular column-shaped column 161 It is a shape area. When the column 161 is inserted into the mounting frame 120, the vertical plate 120a and the horizontal plate 120b constituting the mounting frame 120 restrict the movement of the column 161 in the front-rear and left-right directions. Established.

  As shown in FIGS. 13 and 14, the tip-side suspension device 6 includes an elevating device 61 and a portal frame 160 that supports the elevating device 61. The portal frame 160 regulates the pair of left and right columns 161 extending in the vertical direction, the suspension beam 162 connecting the pair of left and right columns 161 at the upper end of the column 161, and the movement of the lifting device 61 in the front-rear direction. A pair of front and rear restricting plates 163 is provided.

  Each column 161 has a rectangular tube shape. Each restricting plate 163 is an unequal side angle steel (L-shaped steel), and is welded to the column 161 so as to extend in the left-right direction. The front regulating plate 163 whose both ends are welded to the front surface of each column 161 and the rear regulating plate 163 whose both ends are welded to the rear surface of each column 161 are arranged to face each other.

  The suspension beam 162 includes an upper surface plate 162a extending in the left-right direction and a pair of flat plates 162b extending downward from the vicinity of the front end portion of the upper surface plate 162a and the vicinity of the rear end portion of the upper surface plate 162a. The cross-sectional shape in side view is a U-shape with the lower side being an opening. The pair of flat plates 162b are spaced apart in the front-rear direction. The pair of flat plates 162b is provided with a through hole in the center (see FIG. 14), and a support pin 166 is inserted into the through hole (see FIG. 13).

  An upper hook 60 a of the chain block 60 is attached to the support pin 166, and the lifting device 61 is supported by the support pin 166. The upper hook 60 a is inserted from the lower opening of the suspension beam 162 and suspended from the support pin 166. The lifting device 61 includes a chain block 60 and a suspension balance 66 to which a lower hook 60d of the chain block 60 is attached.

  As shown in FIG. 14, the chain block 60 includes an upper hook 60a for attachment to the suspension beam 162, a main body 60b, a load chain (not shown), and a lower hook 60d for attachment to the suspension balance 66. This is a well-known suspended chain block with a hand chain (not shown). Although not shown, the main body 60b is provided with a load sheave (also referred to as a road wheel) and a hand chain wheel (also referred to as a hand wheel) on the same axis.

  As shown in FIGS. 13 and 14, the suspension balance 66 is suspended by a balance main body 67 in which a pair of front and rear flat plate members 67 a are coupled by a plurality of pins, and shackles 69 at both left and right ends of the balance main body 67. And a hanging ring 68 that is lowered. The balance main body 67 is provided with a pin to which the lower hook 60d is attached at the center in the left-right direction. The pair of left and right shackles 69 are connected to pins provided at both left and right ends of the balance body 67. The suspension ring 68 is provided with a circular opening 68a through which the support shaft 47a of the guide sheave 47 is inserted, and an insertion hole through which the bolt of the shackle 69 is inserted is provided above the opening 68a.

  As shown in FIG. 13, the front-rear width of the balance body 67 is slightly smaller than the dimension between the pair of front and rear regulating plates 163. When the chain block 60 is attached to the suspension beam 162, the balance body 67 is disposed between the pair of regulation plates 163. For this reason, the movement of the balance body 67 in the front-rear direction is restricted by the restriction plate 163, and the swinging of the elevating device 61 in the front-rear direction is restricted.

  As shown in FIG. 14, brackets 165 are welded to the left and right ends of the top plate 162a. Wire slings 92 (four in total) are connected to both front and rear ends of each bracket 165 via shackles.

  A holding piece 164 protruding inward is provided on the inner side surfaces of the pair of support columns 161. The holding piece 164 is provided with an insertion hole through which the bolt of the shackle 69 is inserted.

  A method for assembling the crane body 11 and the boom 4 that are separately transported to the work site will be described. In the following description, an operation of attaching the boom 4 to the crane body 11 among the assembly operations of the crane 10 will be described. FIG. 16 is a flowchart showing an assembly procedure of the crane 10. As shown in FIG. 16, the crane 10 is assembled in the following steps: assembly preparation step S100, proximal end lifting device attachment step S110, boom / trailer alignment step S115, boom fixing release step S120, hydraulic hose connection step S130, distal end side. A suspension device attachment step S140, a boom extension step S150, a foot pin attachment step S160, a suspension device removal step S170, a boom cylinder attachment step S180, and a boom standup step S190 are sequentially performed. FIGS. 17 and 18 are diagrams for explaining the assembly work of the crane body 11 and the boom 4.

-Assembly preparation process-
In the assembly preparation step S100, as shown in FIG. 17, the front part of the crane body 11 and the rear part of the loading platform 91 of the trailer 90 on which the boom 4 is placed face each other, and the crane body 11 and the boom 4 are straightened. Place on the line. As shown in FIG. 5, a suspension ring 68 is mounted on the support shaft 47 a of the boom head 46 in advance.

-Base end side lifting device installation process-
In the base end side suspension device attachment step S110, the base end side suspension device 5 is attached to the main frame 3a of the revolving structure 3 as shown in FIG. Since each component constituting the proximal end side suspension device 5 has a mass of less than 20 kg, the operator can easily lift each component on the swivel body 3, and the operator can heal. Assembly work can be performed without using tools.

-Boom / trailer alignment process-
In the boom / trailer alignment step S115, the trailer 90 is moved backward by using a guide bar 99 extending rearward from the loading platform 91 of the trailer 90 so that the swing body 3 and the boom 4 are parallel to each other. Align the position. The height of the crane body 11 in the vertical direction is adjusted by a jack device (not shown) provided on a track frame (not shown) of the traveling body 1.
-Boom fixation release process-
In the boom fixing release step S120, a rope (not shown) and a metal fitting (not shown) for fixing the boom 4 to the loading platform 91 are removed.

-Hydraulic hose connection process-
In the hydraulic hose connection step S130, a hydraulic hose (not shown) provided in the crane body 11 and a connection part 77 (see FIG. 4) of the hydraulic cylinders 70 to 72 in the base boom 41 are assembled and disassembled. Connect with (not shown).

-End side lifting device installation process-
In the tip side suspension device attachment step S140, the tip side suspension device 6 is attached to the front boom transportation platform 101A on the loading platform 91. As shown in FIG. 15, hooks (not shown) of the auxiliary crane are attached to the two wire slings 92 connected to the upper part of the tip side suspension device 6, and the tip side suspension device 6 is lifted by the auxiliary crane. The lower ends of the pair of columns 161 that are the legs of the portal frame 160 of the front end side suspension device 6 are inserted from the upper opening of the mounting frame 120 (see FIG. 5).

  The two wire slings 92 are removed from the hooks of the auxiliary crane, and as shown in FIG. 11, the four wire slings 92 are connected to the loading platform 91 via the lever block (registered trademark) 93, and the tip side suspension device 6 is Secure to cargo bed 91.

-Boom extension process-
In the boom extension step S150, pressure oil from a hydraulic source (not shown) of the crane main body 11 is supplied to the hydraulic cylinders 70 to 72 mounted in the boom 4 so that the base end portion of the boom 4 becomes the revolving structure 3. The boom 4 is extended so as to approach (that is, to shift from the state of FIG. 17 to the state of FIG. 18). As shown in FIGS. 17 and 18, the base boom 41 is supported by the front boom slide part 120A or the rear boom slide part 120B. By switching between supporting the boom 4 by the front boom slide portion 120A and supporting the boom 4 by the rear boom slide portion 120B, members fixed to the boom slide portions 120A, 120B and the boom 4 (for example, cylinder rod mounting portions) 42) can be avoided.

  As shown in FIG. 18, the boom 4 is extended by a predetermined amount, and the foot pin insertion hole 41 a (see FIG. 3A) of the base boom 41 and the foot pin insertion hole 31 a (see FIG. 2) of the boom attachment portion 31 are brought close to each other. .

−Foot pin mounting process−
In the foot pin mounting step S160, the base end portion of the boom 4 is lifted by the base end side suspension device 5 and the tip end portion of the boom 4 is lifted by the front end side suspension device 6; After positioning with the foot pin insertion hole 31a of the boom attachment part 31 in the revolving structure 3, the foot pin 81 is inserted into the foot pin insertion holes 31a and 41a. The detailed procedure of the foot pin attaching step S160 is as follows (Procedure 1A) to (Procedure 8A).

(Procedure 1A) As shown in FIG. 6, the shackle 59 is attached to the suspension bracket 141 of the base boom 41.
(Procedure 2A) A shackle 59 is attached to the lower hook 50d of the chain block 50 of the base end side lifting device 5, and a load is applied to the load chain of the chain block 50 by pulling a hand chain (chain). Here, the load is applied just before the ground cutting.

(Procedure 3A) As shown in FIG. 11, the shackle 69 is attached to the suspension ring 68 attached to the support shaft 47a.
(Procedure 4A) As shown in FIGS. 19A and 20A, a shaft fixing link 112 is attached to the shaft support portion 111. Therefore, as shown in FIGS. 19B and 20B, the shaft fixing link 112 attached to the shaft support portion 111 is removed, and the boom head 46 is restrained by the boom fixing portion 110. By removing the shaft fixing link 112, the boom head 46 can move upward.
(Procedure 5A) The front end portion of the boom 4 is lifted by pulling the chain (chain) of the chain block 60 of the front end side lifting device 6. That is, the tip of the boom 4 is grounded.

(Procedure 6A) As shown in FIG. 6, the base end of the boom 4 is suspended by the chain block 50 by pulling the chain (chain) of the chain block 50. That is, the base end portion of the boom 4 is grounded. Thereby, the front-end | tip part and base end part of the boom 4 will be in the state which floated in the air, and the freedom degree of the movement of the boom 4 will improve. In addition, as shown in FIG.19 (b), the clearance gap of the dimension d is provided between the front side surface of the bearing recessed part 111a, and the spindle 48a, and the movement of the boom head 46 in the front-back direction is the bearing recessed part 111a. In between.

(Procedure 7A) The left and right chain blocks 50L and 50R are individually operated to adjust the left and right heights of the boom 4. That is, the left and right inclinations of the boom 4 are adjusted so that the positions of the foot pin insertion hole 41a (see FIG. 3A) and the foot pin insertion hole 31a (see FIG. 2) are aligned.

(Procedure 8A) When the positioning of the foot pin insertion hole 41a and the foot pin insertion hole 31a is completed, the foot pin 81 is inserted into the foot pin insertion hole 41a and the foot pin insertion hole 31a by a jig (not shown). Thereby, the boom 4 is pivotally supported by the revolving structure 3 so that rotation is possible.

-Removal process for suspension devices-
In removal process S170, such as a suspension apparatus, the base end side suspension apparatus 5 and the front end side suspension apparatus 6 are removed. The lower hook 50 d of the chain block 50 shown in FIG. 6 is removed from the shackle 59, and the shackle 59 is removed from the suspension bracket 141 of the base boom 41. The base end side suspension device 5 is disassembled, and the base end side suspension device 5 is removed from the main frame 3a. In addition, since each component which comprises the base end side suspension apparatus 5 is less than 20 kg in mass, an operator can perform a disassembly operation without using a jig, and an operator can disassemble each component to be disassembled. It can be easily taken down from the top of the swivel body 3 to the ground.

  The hanging ring 68 shown in FIG. 11 is removed from the shackle 69. As shown in FIG. 15, the shackle 69 is attached to the holding piece 164, and the lifting device 61 is fixed to the portal frame 160. Thereby, when the portal frame 160 is moved by the auxiliary crane and when the portal frame 160 is transported by the transport vehicle, the lifting device 61 can be prevented from swinging. The lever block (registered trademark) 93 is removed from the loading platform 91, two wire slings 92 are attached to the hook (not shown) of the auxiliary crane, the tip side suspension device 6 is lifted by the auxiliary crane, and the column 161 is removed from the mounting frame 120. Pulling out and placing the tip side suspension device 6 in a predetermined place. The hanging ring 68 is removed from the support shaft 47a. The shaft fixing link 112 removed in the foot pin attaching step S160 is attached to the shaft support portion 111.

  A hydraulic hose (not shown) dedicated for disassembly and assembly is removed from the connecting portion 77 of the hydraulic cylinders 70 to 72 in the base boom 41. In order to extend the boom 4 during crane operation, a hydraulic hose (not shown) is connected to a hydraulic power source (not shown) of the crane body 11 and a connecting portion 76 (see FIG. 4) of the hydraulic cylinders 70 to 72 in the base boom 41. Connecting.

-Boom cylinder installation process-
In the boom cylinder mounting step S180, as shown in FIG. 18, the boom cylinder 7 is swung by a jack (not shown), and the cylinder rod of the boom cylinder 7 is expanded and contracted to insert the cylinder pin of the cylinder rod mounting portion 42. The hole 42a and the cylinder pin insertion hole 74a of the tip 74 of the cylinder rod of the boom cylinder 7 are aligned. When the alignment between the cylinder pin insertion hole 42a and the cylinder pin insertion hole 74a is completed, a cylinder pin (not shown) is inserted, and the boom cylinder 7 is attached to the boom 4.

-Boom standing up process-
In the boom standing step S190, pressure oil is supplied to the boom cylinder 7 and the boom cylinder 7 is extended, whereby the boom 4 is raised with the foot pin 81 as a fulcrum to be separated from the loading platform 91 of the trailer 90, and the boom is moved to the crane body 11. 4 is completed.

  When removing the boom 4 from the crane main body 11, the work procedure is substantially the reverse of the work procedure for attaching the boom 4 to the crane main body 11 described above. FIG. 21 is a flowchart showing a procedure for disassembling the crane 10. As shown in FIG. 21, the disassembling method of the crane 10 includes a disassembly preparation step S200, a boom placement step S210, a boom cylinder removal step S220, a base end side suspension device attachment step S230, a distal end side suspension device attachment step S240, and a foot pin removal. Step S250, boom fixing step S260, hydraulic hose connection step S270, boom contraction step S280, and suspension device removal step S290 are sequentially performed.

-Disassembly preparation process-
In the disassembly preparation step S200, a hook (not shown) and a hook rope (not shown) are removed. The boom cylinder 7 is expanded and contracted to bring the boom 4 up from a horizontal position by a predetermined angle. The trailer 90 is disposed in front of the crane 10. By using a guide bar 99 extending rearward from the loading platform 91 of the trailer 90, the trailer 90 is moved backward so that the boom 4 and the boom transport fixing device 100 are aligned with each other. The height of the crane body 11 in the vertical direction is adjusted by a jack device (not shown) provided on a track frame (not shown) of the traveling body 1. The shaft fixing link 112 is removed from the shaft support 111.

-Boom placement process-
In the boom placement step S <b> 210, the boom 4 is placed on the loading platform 91 of the trailer 90 by the boom cylinder 7, with the boom 4 lying on the foot pin 81 as a fulcrum. In the boom placement step S210, as shown in FIG. 19B, the boom 4 is appropriately expanded and contracted to adjust the length of the boom 4, and the support shaft 48a of the boom head 46 is placed at the bottom of the bearing recess 111a. Place.

-Boom cylinder removal process-
In the boom cylinder removal step S220, the boom cylinder 7 is supported by a jack (not shown), and the cylinder pin is removed from the cylinder pin insertion hole 42a and the cylinder pin insertion hole 74a. The hydraulic hose (not shown) connected to the hydraulic power source (not shown) of the crane body 11 and the connecting portion 76 (see FIG. 4) of the hydraulic cylinders 70 to 72 in the base boom 41 is removed.

-Base end side lifting device installation process-
Since the proximal end suspension device attachment step S230 is the same as the proximal end suspension device attachment step S110 in the assembly method described above, the description thereof is omitted.
-End side lifting device installation process-
The tip side suspension device attachment step S240 is the same as the tip side suspension device attachment step S140 in the above-described assembling method, and a description thereof will be omitted.

-Foot pin removal process-
In the foot pin removing step S250, the base end portion of the boom 4 is lifted by the base end side suspension device 5 and the tip end portion of the boom 4 is lifted by the front end side suspension device 6; The foot pin 81 inserted in the foot pin insertion hole 31a of the boom attachment part 31 in the revolving structure 3 is removed. The detailed procedure of the foot pin removing step S250 is as follows (procedure 1B) to (procedure 7B).

(Procedure 1B) As shown in FIG. 6, the shackle 59 is attached to the suspension bracket 141 of the base boom 41.
(Procedure 2B) A shackle 59 is attached to the lower hook 50d of the chain block 50 of the base end side lifting device 5, and a load is applied to the load chain of the chain block 50 by pulling a hand chain (chain).

(Procedure 3B) As shown in FIG. 19B, the shackle 69 is attached to the suspension ring 68 attached to the support shaft 47a.
(Procedure 4B) The front end portion of the boom 4 is lifted by pulling the chain (chain) of the chain block 60 of the front end side lifting device 6. That is, the tip of the boom 4 is grounded.

(Procedure 5B) As shown in FIG. 6, the base end of the boom 4 is lifted by the chain block 50 by pulling the chain of the chain block 50. That is, the base end portion of the boom 4 is grounded.

(Procedure 6B) A pulling force (load) is applied to the foot pin 81 by a jig (not shown) used to remove the foot pin 81.
(Procedure 7B) With the pulling force applied, the left chain block 50L and the right chain block 50R are individually operated to adjust the load acting on each of the left chain block 50L and the right chain block 50R. . By operating the chain blocks 50L and 50R, the load on the boom 4 in the vertical direction acting on the foot pin 81 is reduced. By applying a pulling force with a jig (not shown), the foot pin 81 is pulled out with a jig (not shown) when the load on the vertical boom 4 acting on the foot pin 81 is reduced to some extent. Thereby, the boom 4 is separated from the revolving structure 3.

-Boom fixing process-
In the boom fixing step S260, as shown in FIGS. 19A and 20A, the shaft fixing link 112 is attached to the shaft support portion 111, and the boom head 46 is fixed to the boom fixing portion 110.

-Hydraulic hose connection process-
In the hydraulic hose connection step S270, a hydraulic hose (not shown) provided in the crane main body 11 and a connecting portion 77 (see FIG. 4) of the hydraulic cylinders 70 to 72 in the base boom 41 are disassembled and assembled. Connect with (not shown).

-Boom contraction process-
In the boom contraction step S280, pressure oil from a hydraulic power source (not shown) of the crane body 11 is supplied to the hydraulic cylinders 70 to 72 mounted in the boom 4 so that the base end portion of the boom 4 is removed from the swing body 3. The boom 4 is contracted so as to be separated (that is, so as to shift from the state of FIG. 18 to the state of FIG. 17). As shown in FIGS. 18 and 17, the base boom 41 is supported by the front boom slide part 120A or the rear boom slide part 120B. By switching between supporting the boom 4 by the front boom slide portion 120A and supporting the boom 4 by the rear boom slide portion 120B, members fixed to the boom slide portions 120A, 120B and the boom 4 (for example, cylinder rod mounting portions) 42) can be avoided.

-Removal process for suspension devices-
In the lifting device removal step S290, the proximal-side suspension device 5 and the distal-side suspension device 6 are removed as in the above-described lifting device removal step S170. A hydraulic hose (not shown) dedicated for disassembly and assembly is removed from the connecting portion 77 of the hydraulic cylinders 70 to 72 in the base boom 41. The work of detaching the boom 4 from the crane body 11 by securing the boom 4 to the loading platform 91 of the trailer 90 is completed.

According to the embodiment described above, the following operational effects can be obtained.
(1) In the crane assembling method according to the present embodiment, the base end of the boom 4 is turned by supplying pressure oil to the hydraulic cylinders 70 to 72 of the boom 4 mounted on the loading platform 91 of the trailer 90. A boom extension step S150 for extending the boom 4 so as to approach the body 3, a base end portion of the boom 4 is lifted by the base end side suspension device 5 provided in the revolving body 3, and the tip end portion of the boom 4 is trailered. The foot pin mounting step S160 for inserting the foot pin 81 into the foot pin insertion hole 31a of the swivel body 3 in the state of being lifted by the tip side suspension device 6 provided on the load platform 91 of 90, the boom cylinder 7, a boom standing-up step S 190 for raising the boom 4 with the foot pin 81 as a fulcrum and separating it from the loading platform 91 of the trailer 90 is included.

  Thereby, in the assembly work of the crane main body 11 and the boom 4, there is no need to prepare a large auxiliary crane for hanging the boom 4, so that a large occupied space for arranging the large auxiliary crane becomes unnecessary. In the tip side suspension device mounting step S140, the tip side suspension device 6 is lifted using an auxiliary crane. However, since the tip side suspension device 6 is lighter in weight than the boom 4, the auxiliary crane used in step S140 is small. Things can be used. For example, the mass of the boom 4 is about 10 tons (metric tons), whereas the mass of the tip side suspension device 6 is about 0.5 tons (metric tons). That is, the mass of the tip side suspension device 6 is about 1/20 of the mass of the boom 4 and is a small auxiliary crane (for example, a vehicle-mounted crane (UNIC (registered trademark)) having a maximum suspension load of about 3 tons. Can be lifted.

(2) The base end side suspension device 5 includes a pair of left and right chain blocks 50R and 50L that support the base end portion of the boom 4 so as to be lifted and lowered. In the method of assembling the crane 10 according to the present embodiment, in the foot pin mounting step S160 in which the foot pin 81 is inserted into the foot pin insertion holes 31a and 41a, each of the pair of left and right chain blocks 50R and 50L is operated independently. The left / right tilt of the boom 4 was adjusted. Thereby, even if it is a case where the crane 10 is not mounted on the flat ground, the boom 4 can be easily attached to the main frame 3a.

  Although not shown, when the boom 4 is suspended at four points by a large auxiliary crane and the operator performs alignment on the base end side of the boom 4, the operator tilts the boom 4 to the left and right to adjust the position. It is difficult. On the other hand, according to the present embodiment, the left / right inclination of the boom 4 can be easily adjusted, so that the boom 4 can be easily attached to the main frame 3a as compared with the case of using a large auxiliary crane. Can do.

(3) By the way, when the support pin attached to the boom is placed on the pin receiving seat of the foot bracket on the revolving structure, the foot pin can pass through the boss hole of the foot bracket and the boss hole of the foot part of the boom. Is known (see Japanese Patent Application Laid-Open No. 2006-282287 (hereinafter referred to as Patent Document 2)). The support pin is attached to a protrusion provided on the upper surface of the foot portion of the boom or a receiving seat provided on the upper surface of the foot portion of the boom. For this reason, it is necessary to precisely process the support pins, the protrusions or receiving seats provided on the upper surface of the foot part of the boom, the pin receiving seats of the foot bracket on the swivel body, etc. This increases the manufacturing cost of the crane.

  On the other hand, in the present embodiment, the foot block insertion holes are aligned by individually operating the chain blocks 50R and 50L and tilting the boom 4 supported to be suspended to the left and right. For this reason, a highly accurate structure (such as a support pin or hole) described in Patent Document 2 for aligning the boss hole (foot pin insertion hole) of the foot bracket and the boss hole (foot pin insertion hole) of the foot part of the boom. , A receiving seat for receiving the support pin, and a mounting portion between the support pin and the boom are not required. As a result, in the present embodiment, the manufacturing cost of the crane 10 can be reduced.

(4) The operator can perform the alignment operation of the foot pin insertion hole 41a and the foot pin insertion hole 31a on the crane body 11. In contrast, when the crane body 11 is jacked up and the foot pin insertion hole 41a and the foot pin insertion hole 31a are aligned, it is necessary for the operator to get off the crane body 11 every time the jack is operated for safety. There was, and it took time and effort. According to the present embodiment, it is possible to easily attach the boom 4 to the main frame 3a as compared with the case where a jack is used.

(5) The support base 51 includes four bars 150 to which the chain block 50 is attached, a pair of left and right support brackets 151 that support the left and right ends of the bar 150, and a pair of left and right support brackets 151. , And support pipes 153 and diagonal members 154 that connect the left and right columns 152 to each other. The support bracket 151 is attached with support columns 152 at predetermined intervals X1 on both front and rear sides of the recess 151c on which the bar 150 is placed. The predetermined interval X1 is such that the support pipe 153 and the diagonal member 154 interfere with the chain block 50 when the pair of chain blocks 50R and 50L are arranged in the trapezoidal columnar arrangement space defined by the four columns 152. It is set to prevent it. Thereby, the alignment workability | operativity of the boom 4 by the chain block 50 improves.

(6) In the foot pin mounting step S160, since the tip end side of the boom 4 is suspended by the tip end side suspension device 6, the degree of freedom of movement of the boom 4 is higher than when the tip end side of the boom 4 is placed. The positioning of the foot pin insertion hole 31a and the foot pin insertion hole 41a can be easily performed.

(7) The crane disassembling method according to the present embodiment includes a boom placement step S210 in which the boom 4 is placed on the loading platform 91 of the trailer 90 by causing the boom 4 to fall with the foot pin 81 as a fulcrum. In a state where the base end is lifted by the base end side suspension device 5 provided on the revolving structure 3 and the tip end portion of the boom 4 is lifted by the tip end side suspension device 6 provided on the loading platform 91 of the trailer 90. The foot pin insertion hole 41a, the foot pin removal step S250 for removing the foot pin 81 inserted into the foot pin insertion hole 31a of the revolving structure 3, and the hydraulic cylinders 70 to 72 of the boom 4 placed on the loading platform 91 of the trailer 90 are pressurized. A step of contracting the boom 4 so that the base end portion of the boom 4 is separated from the swing body 3 by supplying oil.

  Thereby, in the assembly work of the crane main body 11 and the boom 4, there is no need to prepare a large auxiliary crane for hanging the boom 4, so that a large occupied space for arranging the large auxiliary crane becomes unnecessary.

(8) In the disassembling method of the crane 10 according to the present embodiment, the force for pulling the foot pin 81 from the foot pin insertion hole 41a of the boom 4 and the foot pin insertion hole 31a of the swing body 3 is applied in the foot pin removal step S250 for removing the foot pin 81. In this state, the foot pin 81 is removed by operating each of the pair of left and right chain blocks 50R and 50L independently.

  By operating the chain blocks 50R and 50L individually, the load on the boom 4 in the vertical direction acting on the foot pin 81 can be reduced. With the pulling force applied by the jig, the foot pin 81 is pulled out when the load on the vertical boom 4 acting on the foot pin 81 is reduced to some extent. For this reason, the work time can be shortened as compared with the case where the load removal operation for reducing the load of the boom 4 acting on the foot pin 81 and the extraction operation for applying the extraction load to the foot pin 81 are repeated by the chain blocks 50R and 50L. . Further, it is possible to prevent an excessive pulling force from acting on the foot pin 81.

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the above-described embodiment, the example in which the chain block 60 is employed as a constituent member of the lifting device 61 in the distal-side suspension device 6 and the chain block 50 is employed as the lifting device of the proximal-side suspension device 5 has been described. The invention is not limited to this. Instead of the chain blocks 50, 60, a lever block (registered trademark) may be adopted.

  Instead of the manual chain blocks 50 and 60, an electric chain block using an electric motor as a drive source may be adopted as the lifting device. Instead of the chain blocks 50 and 60, a lifting device using a linearly operable actuator such as a hydraulic cylinder or a lifting device such as a hoist that winds a wire rope with a winch may be employed. In addition, when using a hydraulic cylinder, the rod end part of a hydraulic cylinder is attached via a spherical bush.

(Modification 2)
FIG. 22 is a schematic diagram of the distal-end-side suspension device 6B according to Modification 2, and is a view of the distal-end-side suspension device 6B as viewed from the front side of the crane 10. As shown in FIG. 22, as the lifting device, for example, the distal end portion of the boom 4 may be suspended and supported by a distal end side suspension device 6B employing a pair of left and right hydraulic cylinders 83B. The front end side suspension device 6B includes a pair of left and right hydraulic cylinders 83B, a support base 84B, and a pair of left and right links 85B.

  The hydraulic cylinder 83B has a lower end portion pivotally attached to the support base 84B and an upper end portion pivotally attached to the center portion in the left-right direction of the link 85B. The outer end of the link 85B is pivotally attached to the upper end of the support base 84B by a pin 86B. The link 85B rotates about the pin 86B as a fulcrum by the expansion and contraction of the hydraulic cylinder 83B.

  A shackle 69 is attached to the inner end of the link 85B. Each shackle 69 is connected to a suspension ring 68 attached to a support shaft 47a. With this configuration, the tip end portion of the boom 4 is lifted and supported by the tip side suspension device 6B, and the tip end portion of the boom 4 is moved up and down by extending and contracting the hydraulic cylinder 83B by a manual hydraulic pump or the like. Can do.

  In the first embodiment described above, the suspension beam 162 (see FIG. 13) for connecting the pair of support columns 161 is provided. Therefore, in the assembling / disassembling procedure of the crane 10, the boom 4 standing step (S190) In order to carry out the placing step (S210), the tip side suspension device 6 had to be removed from the loading platform 91.

  On the other hand, in the present modification, there is no member (a member corresponding to the suspension beam 162 of the first embodiment) that interferes with the boom 4 in the boom 4 standing and placing process. For this reason, when the crane 10 is assembled, after the foot pin attaching step (S160) is completed, the boom 4 standing step (S190) can be performed without removing the front end side suspension device 6B. Since the inner end of the link 85B moves upward by extending the hydraulic cylinder 83B to the maximum extension state, the boom 4 can be erected without the link 85B and the boom 4 interfering with each other.

  In addition, by setting the hydraulic cylinder 83B in the most extended state, the boom placement step (S210) can be performed even in a state where the front end side suspension device 6B is attached to the loading platform 91 in advance. For this reason, when disassembling / assembling the crane 10, it is not necessary to suspend the tip-side suspension device 6B with an auxiliary crane, and an occupied space for a small auxiliary crane is not required.

  Furthermore, in this modification, since the height from the ground is 3.8 m or less in a state in which the front end side suspension device 6B is loaded on the loading platform 91, transportation restrictions can also be satisfied. For this reason, it is not necessary to remove the front end side suspension device 6B from the loading platform 91 when the trailer 90 travels.

(Modification 3)
FIG. 23 is a schematic diagram of the distal end side suspension device 6 </ b> C according to Modification 3 and is a view of the distal end side suspension device 6 </ b> C as viewed from the front side of the crane 10. As shown in FIGS. 23 (a) and 23 (b), the tip of the boom 4 may be suspended and supported by a tip-side suspension device 6C that employs a single hydraulic cylinder 83C as the lifting device. The tip side suspension device 6C includes a single hydraulic cylinder 83C, a gate-type support base 84C, and a link 85C. The tip side suspension device 6C has a smaller mass than the boom 4 and can be lifted by a small auxiliary crane, as in the embodiment described above.

  The hydraulic cylinder 83C has a lower end pivotally attached to a bracket 89C provided on the left leg of the portal support 84C, and an upper end pivotally attached to one end of the link 85C. The other end of the link 85C is pivotally attached to a bracket 88C provided on the right leg of the portal support base 84C by a pin 86C. The link 85C rotates about the pin 86C as a fulcrum by expansion and contraction of the hydraulic cylinder 83C.

  A balance 87C is pivotally attached to the left and right central portions of the link 85C, and shackles 69 are attached to both ends of the balance 87C. Each shackle 69 is connected to a suspension ring 68 attached to a support shaft 47a. With this configuration, the tip of the boom 4 is supported by the tip suspension device 6C, and the tip of the boom 4 is moved up and down by extending and contracting the hydraulic cylinder 83C by a manual hydraulic pump or the like. Can do.

(Modification 4)
In the above-described embodiment, as the support base 51 of the proximal end side suspension device 5, two support columns are provided on the left and right sides in an inverted V shape, and the support brackets that connect the two inverted V-shaped support columns 152. Although the chain block 50 is suspended and supported by the bar 150 placed on 151, the present invention is not limited to this. Any configuration may be used as long as the boom 4 can be held when the chain block 50 in which the boom 4 is supported by being suspended is operated.

(Modification 5)
In the above-described embodiment, an example in which the crane body 11 and the boom 4 are assembled and disassembled with the crawler, that is, the side frame 1a and the crawler belt 1b attached to the track frame (not shown) of the traveling body 1. Although described, the present invention is not limited to this. The crane body 11 and the boom 4 may be assembled and disassembled with the crawler removed.

(Modification 6)
In the above-described embodiment, an example in which the crane 10 is assembled in the order of steps S110 → S115 → S120 → S130 → S140 → S150 → S160 → S170 → S180 → S190 is described, but the present invention is not limited to this. For example, if the base end side suspension device attachment step S110, the boom / trailer alignment step S115 and the boom fixing release step S120, the hydraulic hose connection step S130, and the distal end side attachment step S140 are performed before the boom extension step S150. Any order may be used, and work may be performed in parallel.

(Modification 7)
In the above-described embodiment, the example in which the crane 10 is disassembled in the order of steps S200 → S210 → S220 → S230 → S240 → S250 → S260 → S270 → S280 → S290 is described, but the present invention is not limited to this. For example, any of the proximal end suspension device attachment step S230 and the distal end side suspension device attachment step S240 may be performed first, or may be performed simultaneously. The proximal end lifting device attachment step S230 may be performed before the boom placement step S210.

(Modification 8)
In the above-described embodiment, in the foot pin removing step S250, the foot pin 81 is removed by independently operating each of the pair of left and right chain blocks 50R and 50L in a state in which a pulling force is applied to the foot pin 81. However, the present invention is not limited to this. After the operation of the pair of left and right chain blocks 50R and 50L is completed, the foot pin 81 may be pulled out by applying a pulling force. In this case, it is necessary to increase the force with which the foot pin 81 is pulled out as the load of the boom 4 acting on the foot pin 81 increases. For this reason, it is preferable to repeat the load unloading operation by operating the chain blocks 50R and 50L and the pull-out operation to generate the pull-out force by the jig, and perform the load unload operation so that the pull-out force becomes as small as possible. .

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 Traveling body, 3 Revolving body, 4 Boom (multistage boom), 5 Base end side suspension device, 6, 6B, 6C Tip side suspension device, 7 Boom cylinder (lifting device), 10 Crane (movable crane), 31a Foot pin insertion hole (pin insertion hole of swivel body), 41a Foot pin insertion hole (pin insertion hole of multistage boom), 50L, 50R Chain block (elevating device), 60 Chain block, 61 Elevating device, 66 Suspension balance, 70 ~ 72 Hydraulic cylinder (extended actuator), 81 Foot pin, 83B Hydraulic cylinder, 83C Hydraulic cylinder, 90 trailer (transport vehicle), 91 Loading platform

Claims (4)

A mobile crane assembly method comprising: a traveling body; a revolving body provided on the traveling body so as to be capable of swiveling; and a multistage boom attached to the revolving body by a hoisting device with a foot pin as a fulcrum.
By supplying pressure oil to the expansion and contraction actuator of the multi-stage boom mounted on the platform of the transport vehicle, the multi-stage boom is extended so that the base end portion of the multi-stage boom approaches the revolving structure. Process,
The base end portion of the multistage boom is lifted by a base end side suspension device provided on the revolving body, and the tip end portion of the multistage boom is lifted by a front end side suspension device provided on the loading platform of the transport vehicle. In the state, inserting a foot pin into the pin insertion hole of the multistage boom and the pin insertion hole of the swivel body,
The step of raising and lowering the multistage boom with the foot pin as a fulcrum and separating it from the loading platform of the transport vehicle by the hoisting device;
A method for assembling a mobile crane, comprising: The method of assembling a mobile crane according to claim 1,
The base end side suspension device includes a pair of left and right lifting devices that support the base end portion of the multistage boom so as to be lifted and lowered.
A method of assembling a mobile crane, wherein in the step of inserting the foot pin, the left and right pair of lifting devices are independently operated to adjust the left and right inclination of the multistage boom. A mobile crane disassembling method comprising: a traveling body; a revolving body provided on the traveling body so as to be capable of swiveling; and a multistage boom attached to the revolving body by a hoisting device with a foot pin as a fulcrum.
Placing the multi-stage boom with the foot pin as a fulcrum by the hoisting device and placing it on the loading platform of a transport vehicle;
The base end portion of the multistage boom is lifted by a base end side suspension device provided on the revolving body, and the tip end portion of the multistage boom is lifted by a front end side suspension device provided on the loading platform of the transport vehicle. Removing the foot pin inserted into the pin insertion hole of the multistage boom and the pin insertion hole of the swivel body in a state;
By supplying pressure oil to the expansion and contraction actuator of the multi-stage boom mounted on the platform of the transport vehicle, the multi-stage boom is contracted so that the base end of the multi-stage boom is separated from the swivel body. A process of
A method for disassembling a mobile crane, comprising: The method of disassembling a mobile crane according to claim 3,
The base end side suspension device includes a pair of left and right lifting devices that support the base end portion of the multistage boom so as to be lifted and lowered.
In the step of removing the foot pins, each of the pair of right and left lifting devices is independently operated in a state where a force for pulling out the foot pins from the pin insertion holes of the multistage boom and the pin insertion holes of the revolving structure is applied. The disassembly method of the mobile crane which removes the said foot pin by this.

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