WO2020246267A1 - Crane and crane assembling method - Google Patents

Crane and crane assembling method Download PDF

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Publication number
WO2020246267A1
WO2020246267A1 PCT/JP2020/020322 JP2020020322W WO2020246267A1 WO 2020246267 A1 WO2020246267 A1 WO 2020246267A1 JP 2020020322 W JP2020020322 W JP 2020020322W WO 2020246267 A1 WO2020246267 A1 WO 2020246267A1
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WO
WIPO (PCT)
Prior art keywords
boom
strut
jib
lower jib
crane
Prior art date
Application number
PCT/JP2020/020322
Other languages
French (fr)
Japanese (ja)
Inventor
松尾　洋平
祐三 大空
高▲広▼ 岡
健一 中司
徹也 小畠
大輔 高岡
景子 稲田
Original Assignee
コベルコ建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コベルコ建機株式会社 filed Critical コベルコ建機株式会社
Priority to SG11202112743YA priority Critical patent/SG11202112743YA/en
Publication of WO2020246267A1 publication Critical patent/WO2020246267A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes

Definitions

  • the present invention relates to a crane and a crane assembling method in which a boom head, struts, and a lower jib are integrated and can be connected to the tip of a fallen boom body.
  • Patent Document 1 discloses a divided transportation method in which a boom head (tower cap) divided from a boom body and a lower jib are connected and transported.
  • An object of the present invention is to provide a crane and a method for assembling a crane, which can easily connect a boom head to the tip of a fallen boom body.
  • a crane a boom including a crane body, a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion.
  • a boom having a main body and a boom head detachably connected to the tip of the boom main body is supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis.
  • a jib having a lower jib to be attached and a jib connector detachably connected to the tip of the lower jib, and the first rotation center behind the lower jib in a state where the boom and the jib are upright.
  • a support portion capable of supporting a portion on the tip side of the rotation central axis is provided, and the strut and the lower jib are mounted on the boom head, and the strut is placed on the support portion.
  • the strut, the lower jib, and the boom head form a connecting unit, and the connecting unit can be integrally connected to the tip of the boom body that is laid down with respect to the crane body.
  • the boom head is arranged to face the tip of the collapsed boom body, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between and the strut.
  • the lower jib is around the first rotation center axis in a state where the connecting unit is lifted so as to be rotatably supported by the boom head above the lower jib and mounted on the support portion.
  • the lower jib moves relative to the strut in the front-rear direction while the strut rotates around the second rotation center axis and the strut is in contact with the support portion.
  • the support supports the strut so that the head can change its posture with respect to the boom body.
  • a crane body a boom body including a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion.
  • a boom having a boom head detachably connected to the tip of the boom body, and supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis.
  • a jib having a lower jib and a jib connector detachably connected to the tip of the lower jib, and the first rotation center axis behind the lower jib in a state where the boom and the jib are upright.
  • the assembly method includes a preparatory step in which the strut and the lower jib are rotatably attached to the boom head to prepare a connecting unit composed of the boom head, the strut and the lower jib, and the crane main body.
  • the boom head is arranged to face the tip of the boom body that has been laid down, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between.
  • FIG. 1 is a side view of a crane according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view of the main part A of FIG. 1, and is an enlarged perspective view of a part of the lower jib.
  • FIG. 3 is a diagram showing a change in posture of the lower jib of the crane according to the embodiment of the present invention.
  • FIG. 4 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the connecting unit is brought close to the boom main body.
  • FIG. 5 is a side view of the crane according to the embodiment of the present invention, showing a state in which the back surface side portion of the boom head and the boom main body are connected by a pin.
  • FIG. 1 is a side view of a crane according to an embodiment of the present invention.
  • FIG. 2 is an enlarged view of the main part A of FIG. 1, and is an enlarged perspective view of a part of the lower jib.
  • FIG. 3 is
  • FIG. 6 is a side view of the crane according to the embodiment of the present invention, showing a state in which the tip of the lower jib is grounded.
  • FIG. 7 is a side view of the crane according to the embodiment of the present invention, showing a state in which the ventral side portion of the boom head and the boom main body are connected by a pin.
  • FIG. 8 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the triangular guide is raised.
  • FIG. 9 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the boom body is obliquely raised.
  • FIG. 10 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the boom main body is laid down substantially horizontally.
  • FIG. 11 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which struts are assembled.
  • FIG. 12 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the lower jib is hung down.
  • FIG. 13 is a side view of the crane according to the embodiment of the present invention, showing a state in which the lower jib is pulled under the boom main body.
  • FIG. 14 is a side view of the crane according to the embodiment of the present invention, showing a state in which the lower jib is inverted by approximately 180 degrees.
  • FIG. 15 is a side view of the crane according to the embodiment of the present invention, showing a state in which the connector on the back side of the intermediate jib and the connector on the back side of the lower jib are connected.
  • FIG. 16 is a side view of the crane according to the embodiment of the present invention, showing a state in which the connector on the ventral surface side of the intermediate jib and the connector on the ventral surface side of the lower jib are connected.
  • FIG. 1 is a side view of the tower crane 1 (crane) of the present embodiment.
  • the tower crane 1 has a lower traveling body 21 and an upper swinging body 22 (crane main body), and the upper swinging body 22 is rotatably mounted on the crawler type lower traveling body 21. It is composed.
  • the tower crane 1 may be a mobile crane using a moving mechanism (for example, a wheel) other than a crawler, or may be a fixed crane having no moving mechanism.
  • the application target of the present invention is not limited to the tower crane, and for example, the present invention can be applied to other cranes such as a roughing crane.
  • the upper swivel body 22 has a swivel frame 23.
  • the tower crane 1 includes a tower (boom) 24, a jib 25, a gantry 26, a strut 27, a lower spreader 28, a jib undulating lower spreader 35, a strut guy line 36, and a jib undulating upper spreader 37.
  • the swivel frame 23 is attached to the lower traveling body 21 via a swivel bearing (not shown).
  • the tower 24 is undulatingly connected to the swivel frame 23 at the front portion of the swivel frame 23.
  • the tower 24 has a tower body 240 (boom body) and a tower cap 24a (boom head).
  • the tower main body 240 includes a base end portion rotatably supported by the upper swivel body 22 in the undulating direction and a tip end portion on the side opposite to the base end portion.
  • the tower cap 24a is detachably connected to the tip of the tower body 240.
  • One end of the boom guy line 39 is connected to the tower cap 24a.
  • the jib 25 is rotatably connected to the tower cap 24a on the ventral side (front side) of the tower 24.
  • the jib 25 is undulating with respect to the tower 24.
  • the jib 25 can be attached to and detached from the lower jib 25a supported by the tower cap 24a so as to be rotatable around the horizontal first rotation center axis and the tip of the lower jib 25a.
  • It has a jib connector 250 (FIG. 1) to be coupled.
  • the jib connector 250 includes an intermediate jib 25b and an upper jib 25c described later.
  • a jib point sheave 31 is provided at the tip of the jib 25.
  • a hook 33 is suspended from the jib point sheave 31 via a hoisting rope 32.
  • the hoisting rope 32 is wound around a sheave 450 (FIG. 3) pivotally supported by a triangular guide 45 connected to the back side (rear side) of the tower cap 24a and a jib point sheave 31, and then hooked. It is wound around 33.
  • the gantry 26 is attached to the rear part of the swivel frame 23.
  • the struts 27 have a triangular shape in a plan view from the side, and are rotatably connected to the tower cap 24a on the back side (rear side) of the tower 24.
  • the strut 27 has a front strut 27a, a rear strut 27b, and a connecting member 27c.
  • the base end portion (lower end portion in FIG. 1) of the front strut 27a is rotatably connected to the tower cap 24a.
  • the base end portion (front end portion in FIG. 1) of the rear strut 27b is rotatably connected to the tower cap 24a.
  • One end of the connecting member 27c is connected to the tip of the rear strut 27b, while the other end is connected to the tip of the front strut 27a.
  • the tip of the front strut 27a and the tip of the jib 25 are connected by a jib guy line 34.
  • the tower 24 stands up against the upper swivel body 22 and the jib 25 stands up against the tower 24 (FIG. 1).
  • the tower cap 24a is supported by the tower cap 24a so as to be rotatable around the second rotation center axis parallel to the first rotation center axis behind the lower jib 25a in the above, and the jib 25 is supported undulatingly.
  • a jib undulation rope 38 is hung between the jib undulation lower spreader 35, which is the lower part of the tower 24 and is attached to the back side, and the jib undulation upper spreader 37, which is connected to one end of the strut guy line 36. Has been done. The other end of the strut guy line 36 is connected to the tip of the rear strut 27b.
  • the lower spreader 28 is attached to the upper end of the gantry 26.
  • a boom undulating rope 41 is hung between the lower spreader 28 and the upper spreader 40 connected to the other end of the boom guy line 39.
  • the hook winch 46, the jib undulating winch 47, and the boom undulating winch 48 are arranged at the center of the swivel frame 23, respectively.
  • the hook winch 46 winds up or unwinds the hoisting rope 32 to wind up or down the hook 33.
  • the jib undulating winch 47 winds up or unwinds the jib undulating rope 38 to undulate the strut 27 around the joint point with the tip of the tower 24.
  • the jib 25 undulates around the connection point with the tower 24.
  • the boom undulating winch 48 winds up or extends the boom undulating rope 41 to undulate the tower 24 around the boom foot pin 42, which is a fulcrum thereof.
  • the counterweight 29 is mounted on the rear part of the swivel frame 23.
  • the backstop 30 is attached to the lower and back side portions of the tower 24 and extends from the back surface portion of the tower 24 toward the swivel frame 23.
  • the backstop 30 is received by a backstop receiver (not shown) fixed to the swivel frame 23 to regulate the rotation of the tower 24 to the rear side.
  • the jib backstop 44 is attached to the back side portion of the lower jib 25a constituting the jib 25, and extends from the back surface of the lower jib 25a toward the tower cap 24a.
  • the jib backstop 44 is received by the tower cap 24a to regulate the rearward rotation of the jib 25.
  • FIG. 2 is an enlarged view of the main part A of FIG. 1, and is an enlarged perspective view of a part of the lower jib 25a.
  • the tower crane 1 further includes a support portion 2S and a connecting member 12.
  • the support portion 2S is attached to the lower jib 25a, and is capable of supporting a portion of the strut 27 (front strut 27a) on the tip side of the second rotation center axis.
  • the support portion 2S has a bracket 2 (frame) and a roller 11 (support roller).
  • the bracket 2 is attached to the strut 27 side portion of the lower jib 25a (the back side portion, the upper surface portion of the lower jib 25a in FIGS. 2 and 3). Note that FIG. 2 shows a state in which the strut 27 is placed on the lower jib 25a (roller 11).
  • the bracket 2 rotatably supports the roller 11 (support roller) which is a support member.
  • the roller 11 is made of resin or rubber, is rotatable with respect to the lower jib 25a, and has an outer peripheral surface capable of supporting the surface 27e (side surface) of the strut 27 on the lower jib 25a side.
  • the rotation axis of the roller 11 is set in the left-right direction of the upper swing body 22, that is, parallel to the first rotation center axis.
  • the lower jib 25a is supported by the roller 11 on the lower jib 25a side surface 27e of the strut 27 in a state where the back side portion of the tower cap 24a is connected to the collapsed tower body 240 and the ventral side is not connected. It becomes movable relative to the strut 27.
  • the connecting member 12 is supported by the bracket 2.
  • the connecting member 12 can connect the strut 27 and the lower jib 25a to each other so as to prevent the strut 27 from moving relative to the lower jib 25a while the support portion 2S supports the strut 27.
  • the strut 27 and the lower jib 25a are connected by pin-connecting the connecting member 12 and the front strut 27a.
  • the connecting member 12 is in a movement blocking state in which the lower jib 25a is prevented from moving relative to the strut 27 in the front-rear direction while the strut 27 is placed on the support portion 2S, and the strut 27 is in the support portion.
  • the strut 27 and the lower jib 25a are connected to each other so that the lower jib 25a can be switched to a movement allowable state in which the lower jib 25a is allowed to move relative to the strut 27 in the front-rear direction while being placed on the 2S.
  • the connecting member 12 is arranged on the tip end side of the lower jib 25a with respect to the roller 11.
  • a pin hole (not shown) is formed in the front strut 27a.
  • FIG. 3 is a diagram showing a posture change of the lower jib 25a of the tower crane 1 according to the present embodiment.
  • the integrated transportation product 51 connecting unit in which the tower cap 24a, the strut 27, the lower jib 25a, and the triangular guide 45 are integrated is the tip of the tower body 240 that has been laid down. It is possible to connect to the part.
  • the back side portion (upper portion in the drawing) of the tower cap 24a and the tower main body 240 are connected by a pin in a posture as shown by a two-dot chain line (FIG. 5).
  • the pin connection between the connecting member 12 and the front strut 27a is released, so that the connection between the strut 27 and the lower jib 25a is released.
  • the lower jib 25a moves toward the tower 24 (rearward) by its own weight while the surface 27e (FIG. 2) on the lower jib 25a side of the strut 27 is supported by the roller 11.
  • the posture of the tower cap 24a changes to a posture suitable for connecting the ventral side portion (lower portion in the drawing) of the tower cap 24a and the tower 24.
  • the tower crane 1 further has guide rollers (rotating members) 3 and 4.
  • the guide rollers 3 and 4 are provided on the strut 27 side portion (rear surface side portion) of the lower jib 25a, respectively.
  • the guide roller 3 is rotatably provided on the lower jib support leg 5 provided on the strut 27 side portion of the lower jib 25a.
  • the guide roller 4 is detachably attached to the connector 6 on the back side (upper side in the drawing) of the lower jib 25a.
  • the guide rollers 3 and 4 can roll on the ground.
  • the guide rollers 3 and 4 are rotatably mounted on the rear surface of the lower jib 25a in a state where the jib 25 stands upright with respect to the tower 24.
  • FIGS. 4 to 16 are side views of the tower crane 1 according to the present embodiment.
  • the integrated transportation product 51 (connecting unit) in which the tower cap 24a, the strut 27, the lower jib 25a, and the triangular guide 45 are integrated is brought close to the tower body 240 of the tower 24. And put it on the ground. At this time, the tower main body 240 is laid down with respect to the upper swivel body 22, and the tip end portion of the tower main body 240 is placed on the boom stand 61. By integrally transporting the tower cap 24a, the strut 27, and the lower jib 25a, it is not necessary to assemble them, so that the work efficiency can be improved.
  • the tower main body 240 has a connector 241 (first main body connecting portion) arranged at the tip of the tower main body 240 and the tip of the tower main body 240 in a state where the tower main body 240 is laid down with respect to the upper swing body 22. It has a connector 242 (second main body connecting portion) arranged below the connector 241 (FIG. 4).
  • the tower cap 24a is connected to the connector 24b (first head connecting portion) and the connector 242 so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. It has a connector 24c (second head connecting portion) connected to (FIGS. 3 and 5).
  • the strut 27 and the lower jib 25a are connected by connecting the connecting member 12 and the front strut 27a.
  • the connecting member 12 and the front strut 27a As a result, it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation.
  • the integrated transport product 51 is lifted by the auxiliary crane 100, and the connector 24b on the back side portion (upper portion in the drawing) of the tower cap 24a and the connector 241 of the tower body 240 are connected by a pin. ..
  • the wires suspended from the auxiliary crane 100 are connected to the lower jib 25a and the tower cap 24a, respectively.
  • the auxiliary crane 100 grounds the tip of the lower jib 25a as shown in FIG.
  • the wire hanging the tip of the lower jib 25a is removed, and the connection between the connecting member 12 and the front strut 27a is released.
  • the connection between the strut 27 and the lower jib 25a is released, the lower jib 25a moves toward the tower 24 by its own weight while the surface 27e on the lower jib 25a side of the strut 27 is supported by the roller 11.
  • the posture of the tower cap 24a is such that the connector 24c on the ventral side portion (lower portion in the drawing) of the tower cap 24a and the connector 242 at the tip end portion of the tower body 240 are connected. Change to a suitable posture. After that, the operator connects the connector 24c on the ventral side portion of the tower cap 24a and the connector 242 of the tower body 240 with a pin.
  • the strut 27 is connected to the tower body 240 (connector 241) with the back surface side portion (connector 24b) of the tower cap 24a connected.
  • the lower jib 25a is moved toward the tower body 240 while the surface 27e on the lower jib 25a side is supported by the rollers 11.
  • the posture of the tower cap 24a in a state where the back surface side portion of the tower cap 24a is connected to the tower main body 240 can be changed.
  • the posture of the tower cap 24a can be changed to a posture suitable for connecting the ventral side portion of the tower cap 24a and the tower main body 240. Therefore, the connector 24c of the tower cap 24a can be easily connected to the connector 242 at the tip of the inverted tower body 240.
  • the rotation of the roller 11 that supports the surface 27e on the lower jib 25a side of the strut 27 allows the lower jib 25a to be suitably moved relative to the strut 27, that is, to be slid.
  • the triangular guide 45 laid on the strut 27 is raised around the fulcrum 451 (FIG. 3), and the triangular guide 45 is attached to the connecting portion 24d (FIG. 3) of the tower cap 24a.
  • the connecting portion 452 of the above is connected.
  • the boom guy line 39 is connected to the tower cap 24a (FIG. 9).
  • the boom undulating rope 41 is wound up to raise the tower 24 diagonally, and the lower jib 25a is lifted by the auxiliary crane 100. Then, the upper swivel body 22 is swiveled and the boom stand 61 is removed.
  • the boom undulating rope 41 is extended to lay down the tower 24 substantially horizontally, and the jib guy line 36 hung on the sheave 450 and the jib undulating upper spreader 37 are connected.
  • the rear strut 27b is lifted by winding up the jib undulating rope 38, and the strut 27 is assembled by attaching the support column 27d between the rear strut 27b and the front strut 27a.
  • the boom undulating rope 41 is wound up to raise the tower 24, and the jib undulating rope 38 is wound up to raise the strut 27, and the lower jib 25a is hung from the tower cap 24a.
  • the tip of the wire W drawn out from the leaving winch (not shown) provided at the base end portion of the tower 24 is connected to the connector 8 on the back side (left side in the drawing) of the lower jib 25a.
  • the lower jib 25a is pulled under the tower 24 as shown by the arrow.
  • the guide roller 4 attached to the connector 6 touches the ground and rolls on the ground (see FIG. 2).
  • the boom undulating rope 41 is extended and the tower 24 is lowered while the lower jib 25a is inverted about 180 degrees around the fulcrum 25S (FIG. 3) (first rotation center axis).
  • the guide roller 3 provided on the lower jib support leg 5 touches the ground and rolls on the ground (see FIG. 2). This makes it easy to change the orientation of the lower jib 25a by approximately 180 degrees. It is desirable that the guide rollers 3 and 4 are arranged at the tip of the back surface (rear surface) of the lower jib 25a in the working posture of the crane 1.
  • the connector 251 on the back side (upper side in the figure) of the intermediate jib 25b to which the upper jib 25c is connected in advance and the connector 8 on the back side (upper side in the figure) of the lower jib 25a are connected. Connect with pins.
  • the intermediate jib 25b is lifted by the auxiliary crane 100, and the connector 252 on the ventral side (lower side in the figure) of the intermediate jib 25b and the connector on the ventral side (lower side in the figure) of the lower jib 25a. 6 is connected with a pin.
  • the tower cap 24a is arranged to face the tip of the inverted tower body 240, and the lower jib 25a is placed on the tower cap 24a on the opposite side of the tower body 240 with the tower cap 24a in between.
  • the integrally transported product 51 (connecting unit) was lifted so as to be rotatably supported and the strut 27 was rotatably supported by the tower cap 24a above the lower jib 25a and mounted on the support portion 2S.
  • the lower jib 25a rotates around the fulcrum 25S (first rotation center axis)
  • the strut 27 rotates around the fulcrum 27as (second rotation center axis)
  • the strut 27 contacts the support portion 2S.
  • the support portion 2S supports the strut 27 so that the tower cap 24a can change its posture with respect to the tower body 240. ..
  • the connector 24b rotates to the connector 241 so that the connector 24c of the tower cap 24a of the integrally transported product 51 that has been lifted is arranged apart from the connector 242 of the tower body 240 that has been laid down in the front-rear direction.
  • the tower cap 24a rotates around the third rotation center axis so that the connector 24c approaches the connector 242, and the posture of the tower body 240 is changed as shown in FIG.
  • the lower jib 25a rotates around the first rotation center axis
  • the strut 27 rotates around the second rotation center axis
  • the lower jib 25a moves relative to the strut 27.
  • the support portion 2S supports the strut 27 so as to allow the tower body 240 (connector 242) to approach.
  • the above assembly method includes a preparation step, a first connection step, a movement step, and a second connection step.
  • the strut 27 and the lower jib 25a are rotatably attached to the tower cap 24a, and the integrated transport product 51 (connecting unit) composed of the tower cap 24a, the strut 27 and the lower jib 25a is prepared.
  • the preparation step may include transporting the tower cap 24a, the struts 27 and the lower jib 25a together as an integral transport item 51 to the work site.
  • the tower cap 24a is arranged to face the tip of the tower body 240 that has fallen down with respect to the upper swivel body 22, and the lower jib 25a sandwiches the tower cap 24a and the tower is on the opposite side of the tower body 240.
  • At least the tower cap 24a and the lower jib 25a of the integrated transport 51 are lifted and laid down so that they are rotatably supported by the cap 24a and the strut 27 is rotatably supported by the tower cap 24a above the lower jib 25a.
  • the back surface side portion (connector 24b) of the tower cap 24a is connected to the tip end portion (connector 241) of the tower body 240 so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. To do.
  • the lower jib 25a is supported on the tower body 240 side with respect to the strut 27 while the tip side portion of the strut 27 from the second rotation center axis is supported by the support portion 2S provided on the lower jib 25a.
  • the tower cap 24a is rotated around the third rotation center axis, and the ventral side portion (connector 24c) of the tower cap 24a is moved to the tip portion (connector 242) of the tower body 240.
  • ventral side portion (connector 24c) of the tower cap 24a is connected to the tip portion (connector 242) of the tower body 240.
  • the jib 25 is bent with respect to the tower 24 from the state shown in FIG. 1, and as shown in FIG. 16, the boom undulating rope 41 is extended to lay down the tower 24. As a result, the jib 25 is placed below the tower 24. Then, the intermediate jib 25b is lifted by the auxiliary crane 100, and the connection between the connector 252 on the ventral side (lower side in the figure) of the intermediate jib 25b and the connector 6 on the ventral side (lower side in the figure) of the lower jib 25a is released. ..
  • the intermediate jib 25b is lowered to the ground, and the connector 251 on the back side (upper side in the figure) of the intermediate jib 25b and the connector 8 on the back side (upper side in the figure) of the lower jib 25a are connected. To cancel. Then, as shown in FIG. 14, the jib 25 other than the lower jib 25a is removed.
  • the lower jib 25a is inverted by approximately 180 degrees, and the boom undulating rope 41 is extended to lay down the tower 24 substantially horizontally. Then, the support column 27d attached between the rear strut 27b and the front strut 27a is removed.
  • the upper swivel body 22 is swiveled, and the boom undulating rope 41 is extended to lay down the tower 24, and the tip of the tower main body 240 is placed on the boom stand 61. Then, the connection between the tower cap 24a and the boom guy line 39 is released.
  • the triangular guide 45 is tilted down and laid on the strut 27.
  • the tip end side of the lower jib 25a is suspended by the auxiliary crane 100, and the connection between the connector 24c of the ventral side portion (lower portion in the drawing) of the tower cap 24a and the connector 242 of the tower body 240 is released.
  • the lower jib 25a is moved forward until the tip of the lower jib 25a is located at the tip of the front strut 27a. Let me. Then, the strut 27 and the lower jib 25a are connected by connecting the connecting member 12 and the front strut 27a with a pin.
  • the integrated transport product 51 is lifted by the auxiliary crane 100, and the connection between the connector 24b on the back side portion (upper portion in the drawing) of the tower cap 24a and the connector 241 of the tower body 240 is released. ..
  • the integrally transported product 51 is moved to a position away from the tower main body 240.
  • the strut 27 and the lower jib 25a it is not necessary to disassemble them, so that the work efficiency can be improved.
  • by connecting the strut 27 and the lower jib 25a with the connecting member 12 during transportation it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation.
  • the tower cap 24a is lifted when the tower cap 24a is connected to the tip of the tower main body 240 of the tower 24.
  • the posture of the tower cap 24a can be changed without significantly changing the posture of the entire integrated transport product 51. Therefore, it is possible to connect the tower cap 24a to the tower main body 240 while preventing the integrally transported product 51 from interfering with the surrounding members.
  • the lower jib 25a is moved toward the tower body 240 while the surface 27e on the lower jib 25a side of the strut 27 is supported by the roller 11. To the tower.
  • the posture of the tower cap 24a in a state where the back surface side portion of the tower cap 24a is connected to the tower main body 240 can be changed.
  • the posture of the tower cap 24a can be changed to a posture suitable for connecting the ventral side portion of the tower cap 24a and the tower main body 240. Therefore, the tower cap 24a can be easily connected to the tip end portion of the collapsed tower body 240.
  • the strut 27 and the lower jib 25a can be connected by the connecting member 12. Therefore, when the strut 27 and the lower jib 25a are connected during transportation, it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation. As a result, it is possible to suppress the posture of the tower cap 24a from changing during transportation, so that it is possible to suppress the collapse of the load during transportation, and thus damage to each member is suppressed.
  • the roller 11 that is rotatable with respect to the lower jib 25a supports the surface 27e on the lower jib 25a side of the strut 27.
  • the rotation of the roller 11 that supports the surface 27e on the lower jib 25a side of the strut 27 allows the lower jib 25a to be suitably moved (slipped) relative to the strut 27.
  • the tower crane 1 is provided on the strut 27 side portion of the lower jib 25a (the upper surface portion of the lower jib 25a in FIG. 2), and guide rollers 3 and 4 capable of rolling on the ground are provided. Have. By rolling the guide rollers 3 and 4 on the ground, it becomes easy to change the direction of the lower jib 25a by approximately 180 degrees.
  • the tower cap 24a, the strut 27, and the lower jib 25a are integrally transported. As a result, it is not necessary to assemble or disassemble the tower cap 24a, the strut 27, and the lower jib 25a, so that the work efficiency can be improved.
  • the integrated transportation product 51 may not include the triangular guide 45.
  • a crane which is a crane body, a base end portion rotatably supported by the crane body in an undulating direction, and a tip portion opposite to the base end portion.
  • a boom including a boom body and a boom head detachably connected to the tip of the boom body, and the boom so as to be rotatable in an undulating direction around a horizontal first rotation center axis.
  • a jib having a lower jib supported by a boom head and a jib connector detachably connected to the tip of the lower jib, and the boom and the jib behind the lower jib in an upright position.
  • a strut supported by the boom head so as to be rotatable around a second rotation center axis parallel to the first rotation center axis and undulatingly support the jib, and a strut attached to the lower jib and mounted on the lower jib.
  • a support portion capable of supporting a portion on the tip side of the second rotation center axis is provided.
  • the strut and the lower jib are mounted on the boom head, and the strut is placed on the support portion, so that the strut, the lower jib, and the boom head form a connecting unit with respect to the crane body.
  • the connecting unit can be integrally connected to the tip of the collapsed boom body, and the boom head is arranged to face the tip of the collapsed boom body and the lower jib. Is rotatably supported by the boom head on the opposite side of the boom body across the boom head, and the struts are rotatably supported by the boom head above the lower jib and mounted on the support portion.
  • the connecting unit lifted so that it can be placed, the lower jib rotates around the first rotation center axis, the struts rotate around the second rotation center axis, and the struts rotate.
  • the support portion moves relative to the strut in the front-rear direction while contacting the support portion, so that the boom head can change its posture with respect to the boom body. Supports the struts.
  • the lower jib and struts can rotate respectively.
  • the posture of the boom head can be changed without significantly changing the posture of the entire connecting unit. Therefore, it is possible to connect the boom head to the boom body while suppressing the connecting unit from interfering with the surrounding members.
  • the boom main body is the first main body connecting portion arranged at the tip end portion of the boom main body and the tip end portion of the boom main body in a state where the boom main body is laid down with respect to the crane main body. It has a second main body connecting portion arranged below the first main body connecting portion, and the boom head can rotate around a third rotation central axis parallel to the first rotation central axis.
  • the second head of the boom head of the hoisted connecting unit having a first head connecting portion connected to the first main body connecting portion and a second head connecting portion connected to the second main body connecting portion.
  • the first head connecting portion is rotatably connected to the first main body connecting portion so that the head connecting portion is arranged apart from the second main body connecting portion of the boom main body in the front-rear direction. From this state, the boom head rotates around the third rotation center axis so that the second head connecting portion approaches the second main body connecting portion, and the posture of the boom body is changed with respect to the boom main body. Then, the lower jib rotates around the first rotation center axis, the strut rotates around the second rotation center axis, and the lower jib moves relative to the strut, and the second It is desirable for the support to support the strut so as to allow it to approach the body connection.
  • the first head connecting portion (rear side portion) of the boom head is connected to the first main body connecting portion of the boom body.
  • the lower jib is moved towards the boom body while the struts are supported by the support.
  • the posture of the boom head in a state where the first head connecting portion is connected to the boom body can be changed.
  • the posture of the boom head can be changed to a posture suitable for connecting the second head connecting portion (ventral surface side portion) of the boom head and the second main body connecting portion of the boom body. Therefore, the boom head can be easily connected to the tip of the collapsed boom body.
  • a movement blocking state in which the lower jib is prevented from moving relative to the strut in the front-rear direction while the strut is mounted on the support portion and the strut is mounted on the support portion.
  • a connecting member capable of connecting the strut and the lower jib to each other is further provided so that the lower jib can be switched to a movement-allowed state in which the lower jib is allowed to move relative to the strut in the front-rear direction. Is desirable.
  • the support portion includes an outer peripheral surface capable of supporting the strut, and the strut supported by the outer peripheral surface moves relative to the lower jib in the front-rear direction. It is desirable to have a rotatable support roller around a rotation axis parallel to one rotation center axis.
  • the lower jib can be stably moved (slipped) relative to the strut by the rotation of the support roller.
  • a rotating member mounted on the lower jib so that the boom can lie down with respect to the crane body and roll on the ground with the lower jib placed below the boom. It is desirable to further prepare.
  • the direction of the lower jib can be easily changed below the boom during assembly and disassembly.
  • a crane body a boom body including a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion.
  • a boom having a boom head detachably connected to the tip of the boom body, and a lower jib supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis.
  • a jib having a jib connecting body detachably connected to the tip of the lower jib, and parallel to the first rotation center axis behind the boom and the lower jib in a state where the jib is upright.
  • the assembly method includes a preparatory step in which the strut and the lower jib are rotatably attached to the boom head to prepare a connecting unit composed of the boom head, the strut and the lower jib, and the crane main body.
  • the boom head is arranged to face the tip of the boom body that has been laid down, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between.
  • At least the boom head and the lower jib of the connecting unit are lifted and laid down so that the struts are rotatably supported by the boom head above the lower jib and placed on the support portion.
  • the first connecting step of connecting the back surface side portion of the boom head to the tip of the boom body so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. While supporting a portion on the tip end side of the second rotation center axis with a support portion provided on the lower jib, the lower jib is moved relative to the strut toward the boom body, and the boom head is moved to the first.
  • a second connecting step for connecting is provided.
  • the lower jib and the strut are rotatable and the lower part, respectively. Since the jib can move relative to the strut, the posture of the boom head can be changed and the jib can be easily connected to the boom body without significantly changing the posture of the entire connecting unit.
  • the preparatory step includes transporting the boom head, the strut and the lower jib integrally as the connecting unit before the first connecting step.

Abstract

A crane and a crane assembling method that are capable of integrally and easily connecting a lower jib (25a), a strut (27), and a boom head (24a) to the distal end portion of a collapsed boom body (240) are provided. A crane (1) has a support portion (2S) that is attached to the lower jib (25a) and can support the strut (27). The support portion (2S) supports the strut (27) such that when a connection unit (51) is lifted in a state in which the boom head (24a) is disposed facing the distal end portion of the collapsed boom body (240), and the lower jib (25a) and the strut (27) are rotatably supported by the boom head (24a), the lower jib (25a) can move relative to the strut (27) in the front-rear direction as the posture of the boom head (24a) changes with respect to the boom body (240).

Description

クレーンおよびクレーンの組立方法How to assemble a crane and a crane
　本発明は、ブームヘッドとストラットと下部ジブとが一体で、倒伏されたブーム本体の先端部に連結されることが可能なクレーンおよびクレーンの組立方法に関する。 The present invention relates to a crane and a crane assembling method in which a boom head, struts, and a lower jib are integrated and can be connected to the tip of a fallen boom body.
　特許文献１には、ブーム本体から分割されたブームヘッド（タワーキャップ）と下部ジブとを連結した状態で輸送する分割輸送方法が開示されている。 Patent Document 1 discloses a divided transportation method in which a boom head (tower cap) divided from a boom body and a lower jib are connected and transported.
特開２０１４－１１４１０１号公報Japanese Unexamined Patent Publication No. 2014-114101
　ブームヘッドに下部ジブおよびストラットを接続する作業には多くの労力を要する。そこで、今日では、クレーンの組立・分解作業および輸送時の効率を考慮して、ブームヘッドと下部ジブとストラットとを一体にして組立・分解作業を行う施工方法が要求されている。 It takes a lot of labor to connect the lower jib and struts to the boom head. Therefore, today, in consideration of the efficiency of crane assembly / disassembly work and transportation, there is a demand for a construction method in which the boom head, the lower jib and the strut are integrated to perform the assembly / disassembly work.
　しかし、この施工方法の場合、輸送時のブームヘッドの姿勢によっては、ブームヘッドの姿勢を変化させなければ、倒伏されたブームの先端部にブームヘッドを連結することが困難な場合がある。しかしながら、ブームヘッドの姿勢を変化させる際に、当該ブームヘッドと一体となった下部ジブやストラットが地面や周辺の部材と干渉すると、ブームヘッドの姿勢変更が困難になるという問題があった。 However, in the case of this construction method, depending on the posture of the boom head during transportation, it may be difficult to connect the boom head to the tip of the fallen boom unless the posture of the boom head is changed. However, when changing the posture of the boom head, if the lower jib or strut integrated with the boom head interferes with the ground or peripheral members, there is a problem that it becomes difficult to change the posture of the boom head.
　本発明の目的は、倒伏されたブーム本体の先端部にブームヘッドを容易に連結することが可能なクレーンおよびクレーンの組立方法を提供することである。 An object of the present invention is to provide a crane and a method for assembling a crane, which can easily connect a boom head to the tip of a fallen boom body.
　本発明によって提供されるのはクレーンであって、クレーン本体と、前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、前記ブームおよびジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブを起伏可能に支持するストラットと、前記下部ジブに装着され、前記ストラットのうち前記第２回動中心軸よりも先端側部分を支持することが可能な支持部と、を備え、前記ストラットと前記下部ジブとが前記ブームヘッドに装着され前記ストラットが前記支持部に載置されることで前記ストラット、前記下部ジブおよび前記ブームヘッドが連結ユニットを構成し、前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記連結ユニットが一体で連結されることが可能であり、前記倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持されかつ前記支持部に載置されるように前記連結ユニットが吊り上げられた状態で、前記下部ジブが前記第１回動中心軸周りに回動し前記ストラットが前記第２回動中心軸周りに回動するとともに前記ストラットが前記支持部に接触しながら前記下部ジブが前記ストラットに対して前後方向に相対移動することで、前記ブームヘッドが前記ブーム本体に対して姿勢変更することを可能とするように、前記支持部が前記ストラットを支持する。 Provided by the present invention is a crane, a boom including a crane body, a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion. A boom having a main body and a boom head detachably connected to the tip of the boom main body is supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis. A jib having a lower jib to be attached and a jib connector detachably connected to the tip of the lower jib, and the first rotation center behind the lower jib in a state where the boom and the jib are upright. A strut supported by the boom head so as to be rotatable around a second rotation center axis parallel to the shaft and undulatingly supporting the jib, and a strut attached to the lower jib and the second of the struts. A support portion capable of supporting a portion on the tip side of the rotation central axis is provided, and the strut and the lower jib are mounted on the boom head, and the strut is placed on the support portion. The strut, the lower jib, and the boom head form a connecting unit, and the connecting unit can be integrally connected to the tip of the boom body that is laid down with respect to the crane body. The boom head is arranged to face the tip of the collapsed boom body, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between and the strut. The lower jib is around the first rotation center axis in a state where the connecting unit is lifted so as to be rotatably supported by the boom head above the lower jib and mounted on the support portion. The lower jib moves relative to the strut in the front-rear direction while the strut rotates around the second rotation center axis and the strut is in contact with the support portion. The support supports the strut so that the head can change its posture with respect to the boom body.
　また、本発明によって提供されるのは、クレーン本体と、前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、前記ブームおよび前記ジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブを起伏可能に支持するストラットと、を備えるクレーンの組立方法である。当該組立方法は、前記ブームヘッドに前記ストラットおよび前記下部ジブをそれぞれ回動可能に装着し、前記ブームヘッド、前記ストラットおよび前記下部ジブによって構成される連結ユニットを準備する準備ステップと、前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持され前記下部ジブに設けられた支持部に載置されるように前記連結ユニットのうち少なくとも前記ブームヘッドおよび前記下部ジブを吊り上げ、倒伏された前記ブーム本体の先端部に前記ブームヘッドの背面側部分を前記第１回動中心軸と平行な第３回動中心軸周りに回動可能に連結する第１連結ステップと、前記ストラットのうち前記第２回動中心軸よりも先端側部分を前記支持部で支持しながら前記下部ジブを前記ストラットに対して前記ブーム本体側に相対移動させるとともに前記ブームヘッドを前記第３回動中心軸周りに回動させ、前記ブームヘッドの腹面側部分を前記ブーム本体の前記先端部まで移動させる移動ステップと、前記ブームヘッドの前記腹面側部分を前記ブーム本体の前記先端部に連結する第２連結ステップと、を備える。 Further provided by the present invention is a crane body, a boom body including a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion. , A boom having a boom head detachably connected to the tip of the boom body, and supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis. A jib having a lower jib and a jib connector detachably connected to the tip of the lower jib, and the first rotation center axis behind the lower jib in a state where the boom and the jib are upright. This is a method of assembling a crane including a strut supported by the boom head so as to be rotatable around a second rotation center axis parallel to the jib and undulatingly supporting the jib. The assembly method includes a preparatory step in which the strut and the lower jib are rotatably attached to the boom head to prepare a connecting unit composed of the boom head, the strut and the lower jib, and the crane main body. The boom head is arranged to face the tip of the boom body that has been laid down, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between. And at least the boom head and the lower jib of the connecting unit so that the struts are rotatably supported by the boom head above the lower jib and placed on a support provided on the lower jib. A first connection step of rotatably connecting the back surface side portion of the boom head to the tip end portion of the boom body that has been lifted and laid down around a third rotation center axis parallel to the first rotation center axis. While supporting the tip side portion of the strut with respect to the second rotation center axis by the support portion, the lower jib is moved relative to the strut toward the boom body side, and the boom head is moved to the third stage. A moving step of rotating around a central axis of motion to move the ventral side portion of the boom head to the tip portion of the boom body, and connecting the ventral surface side portion of the boom head to the tip portion of the boom body. It includes a second connection step.
図１は、本発明の一実施形態に係るクレーンの側面図である。FIG. 1 is a side view of a crane according to an embodiment of the present invention. 図２は、図１の要部Ａの拡大図であって、下部ジブの一部の拡大斜視図である。FIG. 2 is an enlarged view of the main part A of FIG. 1, and is an enlarged perspective view of a part of the lower jib. 図３は、本発明の一実施形態に係るクレーンの下部ジブの姿勢変化を示す図である。FIG. 3 is a diagram showing a change in posture of the lower jib of the crane according to the embodiment of the present invention. 図４は、本発明の一実施形態に係るクレーンの側面図であり、連結ユニットをブーム本体の近くまで持ってきた状態を示す図である。FIG. 4 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the connecting unit is brought close to the boom main body. 図５は、本発明の一実施形態に係るクレーンの側面図であり、ブームヘッドの背面側部分とブーム本体とをピンで連結した状態を示す図である。FIG. 5 is a side view of the crane according to the embodiment of the present invention, showing a state in which the back surface side portion of the boom head and the boom main body are connected by a pin. 図６は、本発明の一実施形態に係るクレーンの側面図であり、下部ジブの先端を接地させた状態を示す図である。FIG. 6 is a side view of the crane according to the embodiment of the present invention, showing a state in which the tip of the lower jib is grounded. 図７は、本発明の一実施形態に係るクレーンの側面図であり、ブームヘッドの腹面側部分とブーム本体とをピンで連結した状態を示す図である。FIG. 7 is a side view of the crane according to the embodiment of the present invention, showing a state in which the ventral side portion of the boom head and the boom main body are connected by a pin. 図８は、本発明の一実施形態に係るクレーンの側面図であり、三角ガイドを起こした状態を示す図である。FIG. 8 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the triangular guide is raised. 図９は、本発明の一実施形態に係るクレーンの側面図であり、ブーム本体を斜めに起こした状態を示す図である。FIG. 9 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the boom body is obliquely raised. 図１０は、本発明の一実施形態に係るクレーンの側面図であり、ブーム本体をほぼ水平に倒伏させた状態を示す図である。FIG. 10 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the boom main body is laid down substantially horizontally. 図１１は、本発明の一実施形態に係るクレーンの側面図であり、ストラットを組み立てた状態を示す図である。FIG. 11 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which struts are assembled. 図１２は、本発明の一実施形態に係るクレーンの側面図であり、下部ジブを垂下させた状態を示す図である。FIG. 12 is a side view of the crane according to the embodiment of the present invention, and is a view showing a state in which the lower jib is hung down. 図１３は、本発明の一実施形態に係るクレーンの側面図であり、下部ジブをブーム本体の下に引き込んだ状態を示す図である。FIG. 13 is a side view of the crane according to the embodiment of the present invention, showing a state in which the lower jib is pulled under the boom main body. 図１４は、本発明の一実施形態に係るクレーンの側面図であり、下部ジブを略１８０度反転させた状態を示す図である。FIG. 14 is a side view of the crane according to the embodiment of the present invention, showing a state in which the lower jib is inverted by approximately 180 degrees. 図１５は、本発明の一実施形態に係るクレーンの側面図であり、中間ジブの背面側のコネクタと下部ジブの背面側のコネクタとを連結した状態を示す図である。FIG. 15 is a side view of the crane according to the embodiment of the present invention, showing a state in which the connector on the back side of the intermediate jib and the connector on the back side of the lower jib are connected. 図１６は、本発明の一実施形態に係るクレーンの側面図であり、中間ジブの腹面側のコネクタと下部ジブの腹面側のコネクタとを連結した状態を示す図である。FIG. 16 is a side view of the crane according to the embodiment of the present invention, showing a state in which the connector on the ventral surface side of the intermediate jib and the connector on the ventral surface side of the lower jib are connected.
　以下、本発明の好適な実施の形態について、図面を参照しつつ説明する。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
　（タワークレーンの構成）
　図１は、本実施形態のタワークレーン１（クレーン）の側面図である。図１に示すように、タワークレーン１は、下部走行体２１と、上部旋回体２２（クレーン本体）とを有し、クローラ式の下部走行体２１に上部旋回体２２が旋回可能に搭載された構成となっている。なお、タワークレーン１は、クローラ以外の移動機構（例えばホイール）を用いた移動式クレーンであってもよいし、移動機構を持たない固定式クレーンであってもよい。また、本発明の適用対象はタワークレーンに限定されず、例えば、ラッフィングクレーンなどの他のクレーンに本発明を適用することも可能である。 (Structure of tower crane)
FIG. 1 is a side view of the tower crane 1 (crane) of the present embodiment. As shown in FIG. 1, the tower crane 1 has a lower traveling body 21 and an upper swinging body 22 (crane main body), and the upper swinging body 22 is rotatably mounted on the crawler type lower traveling body 21. It is composed. The tower crane 1 may be a mobile crane using a moving mechanism (for example, a wheel) other than a crawler, or may be a fixed crane having no moving mechanism. Further, the application target of the present invention is not limited to the tower crane, and for example, the present invention can be applied to other cranes such as a roughing crane.
　上部旋回体２２は、旋回フレーム２３を有する。また、タワークレーン１は、タワー（ブーム）２４と、ジブ２５と、ガントリ２６と、ストラット２７と、下部スプレッダ２８と、ジブ起伏用下部スプレッダ３５と、ストラットガイライン３６と、ジブ起伏用上部スプレッダ３７と、ジブ起伏ロープ３８と、ブームガイライン３９と、上部スプレッダ４０と、ブーム起伏ロープ４１と、フック用ウインチ４６と、ジブ起伏用ウインチ４７と、ブーム起伏用ウインチ４８と、カウンタウエイト２９と、バックストップ３０と、ジブバックストップ４４と、を有している。 The upper swivel body 22 has a swivel frame 23. Further, the tower crane 1 includes a tower (boom) 24, a jib 25, a gantry 26, a strut 27, a lower spreader 28, a jib undulating lower spreader 35, a strut guy line 36, and a jib undulating upper spreader 37. , Jib undulation rope 38, boom guy line 39, upper spreader 40, boom undulation rope 41, hook winch 46, jib undulation winch 47, boom undulation winch 48, counter weight 29, and bucks. It has a top 30 and a jib backstop 44.
　旋回フレーム２３は、旋回ベアリング（図示せず）を介して下部走行体２１に取り付けられている。タワー２４は、旋回フレーム２３の前部に、旋回フレーム２３に対して起伏可能に連結されている。 The swivel frame 23 is attached to the lower traveling body 21 via a swivel bearing (not shown). The tower 24 is undulatingly connected to the swivel frame 23 at the front portion of the swivel frame 23.
　タワー２４は、タワー本体２４０（ブーム本体）と、タワーキャップ２４ａ（ブームヘッド）とを有する。タワー本体２４０は、上部旋回体２２に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含む。タワーキャップ２４ａは、タワー本体２４０の先端部に着脱可能に連結されている。タワーキャップ２４ａには、ブームガイライン３９の一端部が接続されている。 The tower 24 has a tower body 240 (boom body) and a tower cap 24a (boom head). The tower main body 240 includes a base end portion rotatably supported by the upper swivel body 22 in the undulating direction and a tip end portion on the side opposite to the base end portion. The tower cap 24a is detachably connected to the tip of the tower body 240. One end of the boom guy line 39 is connected to the tower cap 24a.
　ジブ２５は、タワー２４の腹面側（前側）においてタワーキャップ２４ａに回動可能に連結されている。ジブ２５は、タワー２４に対して起伏可能である。詳しくは、ジブ２５は、水平な第１回動中心軸周りに起伏方向に回動可能なように前記タワーキャップ２４ａに支持される下部ジブ２５ａと、前記下部ジブ２５ａの先端部に着脱可能に連結されるジブ連結体２５０（図１）と、を有する。ジブ連結体２５０は、後記の中間ジブ２５ｂ、上部ジブ２５ｃを含む。ジブ２５の先端には、ジブポイントシーブ３１が設けられている。このジブポイントシーブ３１からは巻上ロープ３２を介してフック３３が吊り下げられている。巻上ロープ３２は、タワーキャップ２４ａの背面側（後側）に連結された三角ガイド４５に軸支されたシーブ４５０（図３）、および、ジブポイントシーブ３１に巻回されたうえで、フック３３に巻回されている。 The jib 25 is rotatably connected to the tower cap 24a on the ventral side (front side) of the tower 24. The jib 25 is undulating with respect to the tower 24. Specifically, the jib 25 can be attached to and detached from the lower jib 25a supported by the tower cap 24a so as to be rotatable around the horizontal first rotation center axis and the tip of the lower jib 25a. It has a jib connector 250 (FIG. 1) to be coupled. The jib connector 250 includes an intermediate jib 25b and an upper jib 25c described later. A jib point sheave 31 is provided at the tip of the jib 25. A hook 33 is suspended from the jib point sheave 31 via a hoisting rope 32. The hoisting rope 32 is wound around a sheave 450 (FIG. 3) pivotally supported by a triangular guide 45 connected to the back side (rear side) of the tower cap 24a and a jib point sheave 31, and then hooked. It is wound around 33.
　ガントリ２６は、旋回フレーム２３の後部に取り付けられている。ストラット２７は、側方からの平面視で三角形状であって、タワー２４の背面側（後側）においてタワーキャップ２４ａに回動可能に連結されている。ストラット２７は、フロントストラット２７ａと、リアストラット２７ｂと、連結部材２７ｃとを有している。フロントストラット２７ａの基端部（図１の下端部）は、タワーキャップ２４ａに回動可能に連結されている。リアストラット２７ｂの基端部（図１の前端部）は、タワーキャップ２４ａに回動可能に連結されている。連結部材２７ｃは、その一端部がリアストラット２７ｂの先端部に連結される一方、その他端部がフロントストラット２７ａの先端部に連結されている。フロントストラット２７ａの先端部とジブ２５の先端部とは、ジブガイライン３４により連結されている。なお、ストラット２７について換言すれば、ストラット２７（フロントストラット２７ａと、リアストラット２７ｂ）は、タワー２４が上部旋回体２２に対して起立しジブ２５がタワー２４に対して起立した状態（図１）における下部ジブ２５ａの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記タワーキャップ２４ａに支持され、ジブ２５を起伏可能に支持する。 The gantry 26 is attached to the rear part of the swivel frame 23. The struts 27 have a triangular shape in a plan view from the side, and are rotatably connected to the tower cap 24a on the back side (rear side) of the tower 24. The strut 27 has a front strut 27a, a rear strut 27b, and a connecting member 27c. The base end portion (lower end portion in FIG. 1) of the front strut 27a is rotatably connected to the tower cap 24a. The base end portion (front end portion in FIG. 1) of the rear strut 27b is rotatably connected to the tower cap 24a. One end of the connecting member 27c is connected to the tip of the rear strut 27b, while the other end is connected to the tip of the front strut 27a. The tip of the front strut 27a and the tip of the jib 25 are connected by a jib guy line 34. In other words, in the strut 27 (front strut 27a and rear strut 27b), the tower 24 stands up against the upper swivel body 22 and the jib 25 stands up against the tower 24 (FIG. 1). The tower cap 24a is supported by the tower cap 24a so as to be rotatable around the second rotation center axis parallel to the first rotation center axis behind the lower jib 25a in the above, and the jib 25 is supported undulatingly.
　タワー２４の下部であって背面側に取り付けられたジブ起伏用下部スプレッダ３５と、ストラットガイライン３６の一端部に連結されたジブ起伏用上部スプレッダ３７との間には、ジブ起伏ロープ３８が掛け渡されている。ストラットガイライン３６の他端部は、リアストラット２７ｂの先端部に接続されている。 A jib undulation rope 38 is hung between the jib undulation lower spreader 35, which is the lower part of the tower 24 and is attached to the back side, and the jib undulation upper spreader 37, which is connected to one end of the strut guy line 36. Has been done. The other end of the strut guy line 36 is connected to the tip of the rear strut 27b.
　下部スプレッダ２８は、ガントリ２６の上端部に取り付けられている。下部スプレッダ２８と、ブームガイライン３９の他端部に連結された上部スプレッダ４０との間には、ブーム起伏ロープ４１が掛け渡されている。 The lower spreader 28 is attached to the upper end of the gantry 26. A boom undulating rope 41 is hung between the lower spreader 28 and the upper spreader 40 connected to the other end of the boom guy line 39.
　フック用ウインチ４６、ジブ起伏用ウインチ４７、および、ブーム起伏用ウインチ４８は、旋回フレーム２３の中央部にそれぞれ配置されている。フック用ウインチ４６は、巻上ロープ３２を巻き取り又は繰り出してフック３３の巻き上げ又は巻き下げを行う。ジブ起伏用ウインチ４７は、ジブ起伏ロープ３８を巻き取り又は繰り出すことで、ストラット２７をタワー２４の先端部との結合点を中心に起伏させる。この結果、ジブ２５がタワー２４との結合点を中心として起伏する。ブーム起伏用ウインチ４８は、ブーム起伏ロープ４１を巻き取り又は繰り出すことで、タワー２４を、その支点であるブームフットピン４２回りに起伏させる。 The hook winch 46, the jib undulating winch 47, and the boom undulating winch 48 are arranged at the center of the swivel frame 23, respectively. The hook winch 46 winds up or unwinds the hoisting rope 32 to wind up or down the hook 33. The jib undulating winch 47 winds up or unwinds the jib undulating rope 38 to undulate the strut 27 around the joint point with the tip of the tower 24. As a result, the jib 25 undulates around the connection point with the tower 24. The boom undulating winch 48 winds up or extends the boom undulating rope 41 to undulate the tower 24 around the boom foot pin 42, which is a fulcrum thereof.
　カウンタウエイト２９は、旋回フレーム２３の後部に搭載されている。バックストップ３０は、タワー２４の下側かつ背面側部分に取り付けられ、タワー２４の背面部から旋回フレーム２３に向かって延びている。バックストップ３０は、旋回フレーム２３に固定されたバックストップ受け（図示せず）に受けられることで、タワー２４の後側への回動を規制する。 The counterweight 29 is mounted on the rear part of the swivel frame 23. The backstop 30 is attached to the lower and back side portions of the tower 24 and extends from the back surface portion of the tower 24 toward the swivel frame 23. The backstop 30 is received by a backstop receiver (not shown) fixed to the swivel frame 23 to regulate the rotation of the tower 24 to the rear side.
　ジブバックストップ４４は、ジブ２５を構成する下部ジブ２５ａの背面側部分に取り付けられ、下部ジブ２５ａの背面からタワーキャップ２４ａに向かって延びている。ジブバックストップ４４は、タワーキャップ２４ａに受けられることで、ジブ２５の後側への回動を規制する。 The jib backstop 44 is attached to the back side portion of the lower jib 25a constituting the jib 25, and extends from the back surface of the lower jib 25a toward the tower cap 24a. The jib backstop 44 is received by the tower cap 24a to regulate the rearward rotation of the jib 25.
　図２は、図１の要部Ａの拡大図であって、下部ジブ２５ａの一部の拡大斜視図である。図２に示すように、タワークレーン１は、支持部２Ｓと、連結部材１２とを更に有する。支持部２Ｓは、下部ジブ２５ａに装着され、ストラット２７（フロントストラット２７ａ）のうち前記第２回動中心軸よりも先端側部分を支持することが可能とされている。支持部２Ｓは、ブラケット２（フレーム）と、ローラ１１（支持ローラ）とを有している。ブラケット２は、下部ジブ２５ａのストラット２７側部分（背面側部分、図２、図３における下部ジブ２５ａの上面部）に取り付けられている。なお、図２は、下部ジブ２５ａ（ローラ１１）の上にストラット２７が載置された状態が図示されている。 FIG. 2 is an enlarged view of the main part A of FIG. 1, and is an enlarged perspective view of a part of the lower jib 25a. As shown in FIG. 2, the tower crane 1 further includes a support portion 2S and a connecting member 12. The support portion 2S is attached to the lower jib 25a, and is capable of supporting a portion of the strut 27 (front strut 27a) on the tip side of the second rotation center axis. The support portion 2S has a bracket 2 (frame) and a roller 11 (support roller). The bracket 2 is attached to the strut 27 side portion of the lower jib 25a (the back side portion, the upper surface portion of the lower jib 25a in FIGS. 2 and 3). Note that FIG. 2 shows a state in which the strut 27 is placed on the lower jib 25a (roller 11).
　ブラケット２は、支持部材であるローラ１１（支持ローラ）を回転可能に支持している。ローラ１１は、樹脂製またはゴム製であって、下部ジブ２５ａに対して回転自在であり、ストラット２７のうち下部ジブ２５ａ側の面２７ｅ（側面）を支持可能な外周面を有する。なお、ローラ１１の回転軸は、上部旋回体２２の左右方向、すなわち、前記第１回転中心軸と平行に設定されている。倒伏されたタワー本体２４０にタワーキャップ２４ａの背面側部分が連結され腹面側が連結されていない状態で、ストラット２７の下部ジブ２５ａ側の面２７ｅがローラ１１で支持されることで、下部ジブ２５ａがストラット２７に対して相対移動可能になる。 The bracket 2 rotatably supports the roller 11 (support roller) which is a support member. The roller 11 is made of resin or rubber, is rotatable with respect to the lower jib 25a, and has an outer peripheral surface capable of supporting the surface 27e (side surface) of the strut 27 on the lower jib 25a side. The rotation axis of the roller 11 is set in the left-right direction of the upper swing body 22, that is, parallel to the first rotation center axis. The lower jib 25a is supported by the roller 11 on the lower jib 25a side surface 27e of the strut 27 in a state where the back side portion of the tower cap 24a is connected to the collapsed tower body 240 and the ventral side is not connected. It becomes movable relative to the strut 27.
　また、連結部材１２はブラケット２に支持されている。連結部材１２は、支持部２Ｓがストラット２７を支持した状態でストラット２７が下部ジブ２５ａに対して相対移動することを阻止するようにストラット２７と下部ジブ２５ａとを互いに連結可能である。具体的には、連結部材１２とフロントストラット２７ａとがピン結合されることで、ストラット２７と下部ジブ２５ａとが連結される。この結果、連結部材１２は、ストラット２７が支持部２Ｓに載置された状態で下部ジブ２５ａがストラット２７に対して前後方向に相対移動することを阻止する移動阻止状態と、ストラット２７が支持部２Ｓに載置された状態で下部ジブ２５ａがストラット２７に対して前後方向に相対移動することを許容する移動許容状態とに切換可能なように、ストラット２７と下部ジブ２５ａとを互いに連結する。本実施形態では、図２に示すように連結部材１２は、ローラ１１よりも下部ジブ２５ａの先端側に配置されている。なお、フロントストラット２７ａには不図示のピン孔が形成されている。 Further, the connecting member 12 is supported by the bracket 2. The connecting member 12 can connect the strut 27 and the lower jib 25a to each other so as to prevent the strut 27 from moving relative to the lower jib 25a while the support portion 2S supports the strut 27. Specifically, the strut 27 and the lower jib 25a are connected by pin-connecting the connecting member 12 and the front strut 27a. As a result, the connecting member 12 is in a movement blocking state in which the lower jib 25a is prevented from moving relative to the strut 27 in the front-rear direction while the strut 27 is placed on the support portion 2S, and the strut 27 is in the support portion. The strut 27 and the lower jib 25a are connected to each other so that the lower jib 25a can be switched to a movement allowable state in which the lower jib 25a is allowed to move relative to the strut 27 in the front-rear direction while being placed on the 2S. In the present embodiment, as shown in FIG. 2, the connecting member 12 is arranged on the tip end side of the lower jib 25a with respect to the roller 11. A pin hole (not shown) is formed in the front strut 27a.
　図３は、本実施形態に係るタワークレーン１の下部ジブ２５ａの姿勢変化を示す図である。図３に示すように、本実施形態では、タワーキャップ２４ａとストラット２７と下部ジブ２５ａと三角ガイド４５とが一体となった一体輸送品５１（連結ユニット）が、倒伏されたタワー本体２４０の先端部に連結されることが可能である。このとき、まず、２点鎖線で示すような姿勢で、タワーキャップ２４ａの背面側部分（図中上側部分）とタワー本体２４０とがピンで連結される（図５）。そして、連結部材１２とフロントストラット２７ａとのピン連結が解除されることで、ストラット２７と下部ジブ２５ａとの連結が解除される。すると、実線で示すように、ストラット２７の下部ジブ２５ａ側の面２７ｅ（図２）がローラ１１で支持されながら、下部ジブ２５ａがその自重でタワー２４の方（後方）に移動する。これにより、タワーキャップ２４ａの姿勢が、タワーキャップ２４ａの腹面側部分（図中下側部分）とタワー２４とを連結するのに適した姿勢に変化する。 FIG. 3 is a diagram showing a posture change of the lower jib 25a of the tower crane 1 according to the present embodiment. As shown in FIG. 3, in the present embodiment, the integrated transportation product 51 (connecting unit) in which the tower cap 24a, the strut 27, the lower jib 25a, and the triangular guide 45 are integrated is the tip of the tower body 240 that has been laid down. It is possible to connect to the part. At this time, first, the back side portion (upper portion in the drawing) of the tower cap 24a and the tower main body 240 are connected by a pin in a posture as shown by a two-dot chain line (FIG. 5). Then, the pin connection between the connecting member 12 and the front strut 27a is released, so that the connection between the strut 27 and the lower jib 25a is released. Then, as shown by the solid line, the lower jib 25a moves toward the tower 24 (rearward) by its own weight while the surface 27e (FIG. 2) on the lower jib 25a side of the strut 27 is supported by the roller 11. As a result, the posture of the tower cap 24a changes to a posture suitable for connecting the ventral side portion (lower portion in the drawing) of the tower cap 24a and the tower 24.
　図２に戻って、タワークレーン１は、ガイドローラ（回転部材）３，４を更に有している。ガイドローラ３，４は、下部ジブ２５ａのストラット２７側部分（背面側部分）にそれぞれ設けられている。ガイドローラ３は、下部ジブ２５ａのストラット２７側部分に設けられた下部ジブ支持脚５に回転自在に設けられている。ガイドローラ４は、下部ジブ２５ａの背面側（図中上側）のコネクタ６に着脱可能に取り付けられる。ガイドローラ３，４は、地面を転動することが可能である。ガイドローラ３，４は、ジブ２５がタワー２４に対して起立した状態における下部ジブ２５ａの後面部に回転可能に装着されている。 Returning to FIG. 2, the tower crane 1 further has guide rollers (rotating members) 3 and 4. The guide rollers 3 and 4 are provided on the strut 27 side portion (rear surface side portion) of the lower jib 25a, respectively. The guide roller 3 is rotatably provided on the lower jib support leg 5 provided on the strut 27 side portion of the lower jib 25a. The guide roller 4 is detachably attached to the connector 6 on the back side (upper side in the drawing) of the lower jib 25a. The guide rollers 3 and 4 can roll on the ground. The guide rollers 3 and 4 are rotatably mounted on the rear surface of the lower jib 25a in a state where the jib 25 stands upright with respect to the tower 24.
　（タワークレーンの組立方法）
　次に、タワークレーン１の組立方法について、図４～図１６を参照しつつ説明する。図４～図１６は、本実施形態に係るタワークレーン１の側面図である。 (How to assemble a tower crane)
Next, the method of assembling the tower crane 1 will be described with reference to FIGS. 4 to 16. 4 to 16 are side views of the tower crane 1 according to the present embodiment.
　まず、図４に示すように、タワーキャップ２４ａとストラット２７と下部ジブ２５ａと三角ガイド４５とが一体となった一体輸送品５１（連結ユニット）をタワー２４のタワー本体２４０の近くまで持って来て、地面の上に置く。このとき、タワー本体２４０は上部旋回体２２に対して倒伏されており、タワー本体２４０の先端部は、ブーム置台６１の上に載置されている。タワーキャップ２４ａとストラット２７と下部ジブ２５ａとを一体で輸送することで、これらを組み立てる必要がないので、作業効率を向上させることができる。 First, as shown in FIG. 4, the integrated transportation product 51 (connecting unit) in which the tower cap 24a, the strut 27, the lower jib 25a, and the triangular guide 45 are integrated is brought close to the tower body 240 of the tower 24. And put it on the ground. At this time, the tower main body 240 is laid down with respect to the upper swivel body 22, and the tip end portion of the tower main body 240 is placed on the boom stand 61. By integrally transporting the tower cap 24a, the strut 27, and the lower jib 25a, it is not necessary to assemble them, so that the work efficiency can be improved.
　タワー本体２４０は、当該タワー本体２４０が上部旋回体２２に対して倒伏した状態で、タワー本体２４０の先端部に配置されるコネクタ２４１（第１本体連結部）とタワー本体２４０の前記先端部においてコネクタ２４１の下方に配置されるコネクタ２４２（第２本体連結部）とを有する（図４）。一方、タワーキャップ２４ａは、前記第１回動中心軸と平行な第３回動中心軸周りに回動可能なように前記コネクタ２４１に連結されるコネクタ２４ｂ（第１ヘッド連結部）とコネクタ２４２に連結されるコネクタ２４ｃ（第２ヘッド連結部）とを有する（図３、図５）。 The tower main body 240 has a connector 241 (first main body connecting portion) arranged at the tip of the tower main body 240 and the tip of the tower main body 240 in a state where the tower main body 240 is laid down with respect to the upper swing body 22. It has a connector 242 (second main body connecting portion) arranged below the connector 241 (FIG. 4). On the other hand, the tower cap 24a is connected to the connector 24b (first head connecting portion) and the connector 242 so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. It has a connector 24c (second head connecting portion) connected to (FIGS. 3 and 5).
　一体輸送品５１の輸送時に、連結部材１２とフロントストラット２７ａとが連結されることで、ストラット２７と下部ジブ２５ａとが連結されている。これにより、輸送中に下部ジブ２５ａがストラット２７に対して相対移動するのを抑制することができる。この結果、輸送中にタワーキャップ２４ａの姿勢が変化するのを抑制することができるので、輸送中の荷崩れを抑制することができる。 At the time of transporting the integrally transported product 51, the strut 27 and the lower jib 25a are connected by connecting the connecting member 12 and the front strut 27a. As a result, it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation. As a result, it is possible to suppress the posture of the tower cap 24a from changing during transportation, so that it is possible to suppress the collapse of the load during transportation.
　次に、図５に示すように、補助クレーン１００で一体輸送品５１を持ち上げ、タワーキャップ２４ａの背面側部分（図中上側部分）のコネクタ２４ｂとタワー本体２４０のコネクタ２４１とをピンで連結する。なお、補助クレーン１００から吊り下げられるワイヤーは、下部ジブ２５ａおよびタワーキャップ２４ａにそれぞれ接続されている。次に、補助クレーン１００によって、図６に示すように、下部ジブ２５ａの先端を接地させる。 Next, as shown in FIG. 5, the integrated transport product 51 is lifted by the auxiliary crane 100, and the connector 24b on the back side portion (upper portion in the drawing) of the tower cap 24a and the connector 241 of the tower body 240 are connected by a pin. .. The wires suspended from the auxiliary crane 100 are connected to the lower jib 25a and the tower cap 24a, respectively. Next, the auxiliary crane 100 grounds the tip of the lower jib 25a as shown in FIG.
　次に、図６において下部ジブ２５ａの先端部を吊っていたワイヤーを外し、連結部材１２とフロントストラット２７ａとの連結を解除する。ストラット２７と下部ジブ２５ａとの連結が解除されることで、ストラット２７の下部ジブ２５ａ側の面２７ｅがローラ１１で支持されながら、下部ジブ２５ａがその自重でタワー２４の方に移動する。これにより、タワーキャップ２４ａの姿勢が、図７に示すように、タワーキャップ２４ａの腹面側部分（図中下側部分）のコネクタ２４ｃとタワー本体２４０の先端部のコネクタ２４２とを連結するのに適した姿勢に変化する。その後、作業者はタワーキャップ２４ａの腹面側部分のコネクタ２４ｃとタワー本体２４０のコネクタ２４２とをピンで連結する。 Next, in FIG. 6, the wire hanging the tip of the lower jib 25a is removed, and the connection between the connecting member 12 and the front strut 27a is released. When the connection between the strut 27 and the lower jib 25a is released, the lower jib 25a moves toward the tower 24 by its own weight while the surface 27e on the lower jib 25a side of the strut 27 is supported by the roller 11. As a result, as shown in FIG. 7, the posture of the tower cap 24a is such that the connector 24c on the ventral side portion (lower portion in the drawing) of the tower cap 24a and the connector 242 at the tip end portion of the tower body 240 are connected. Change to a suitable posture. After that, the operator connects the connector 24c on the ventral side portion of the tower cap 24a and the connector 242 of the tower body 240 with a pin.
　このように、タワー本体２４０の先端部にタワーキャップ２４ａが連結される際に、タワーキャップ２４ａの背面側部分（コネクタ２４ｂ）がタワー本体２４０（コネクタ２４１）に連結された状態で、ストラット２７の下部ジブ２５ａ側の面２７ｅがローラ１１で支持されながら、下部ジブ２５ａがタワー本体２４０の方に移動される。これにより、タワーキャップ２４ａの背面側部分がタワー本体２４０に連結された状態のタワーキャップ２４ａの姿勢を変化させることができる。この結果、タワーキャップ２４ａの腹面側部分とタワー本体２４０とを連結するのに適した姿勢に、タワーキャップ２４ａの姿勢を変化させることができる。よって、倒伏されたタワー本体２４０の先端部のコネクタ２４２にタワーキャップ２４ａのコネクタ２４ｃを容易に連結することができる。 In this way, when the tower cap 24a is connected to the tip of the tower body 240, the strut 27 is connected to the tower body 240 (connector 241) with the back surface side portion (connector 24b) of the tower cap 24a connected. The lower jib 25a is moved toward the tower body 240 while the surface 27e on the lower jib 25a side is supported by the rollers 11. As a result, the posture of the tower cap 24a in a state where the back surface side portion of the tower cap 24a is connected to the tower main body 240 can be changed. As a result, the posture of the tower cap 24a can be changed to a posture suitable for connecting the ventral side portion of the tower cap 24a and the tower main body 240. Therefore, the connector 24c of the tower cap 24a can be easily connected to the connector 242 at the tip of the inverted tower body 240.
　また、ストラット２７の下部ジブ２５ａ側の面２７ｅを支持するローラ１１の回転により、ストラット２７に対して下部ジブ２５ａを好適に相対移動させる、すなわち滑らせることができる。 Further, the rotation of the roller 11 that supports the surface 27e on the lower jib 25a side of the strut 27 allows the lower jib 25a to be suitably moved relative to the strut 27, that is, to be slid.
　次に、図８に示すように、ストラット２７の上に寝かされていた三角ガイド４５を支点４５１（図３）を中心に起こし、タワーキャップ２４ａの連結部２４ｄ（図３）に三角ガイド４５の連結部４５２を連結する。また、タワーキャップ２４ａにブームガイライン３９を接続する（図９）。 Next, as shown in FIG. 8, the triangular guide 45 laid on the strut 27 is raised around the fulcrum 451 (FIG. 3), and the triangular guide 45 is attached to the connecting portion 24d (FIG. 3) of the tower cap 24a. The connecting portion 452 of the above is connected. Further, the boom guy line 39 is connected to the tower cap 24a (FIG. 9).
　次に、図９に示すように、ブーム起伏ロープ４１を巻き上げてタワー２４を斜めに起こすとともに、補助クレーン１００で下部ジブ２５ａを吊り上げる。そして、上部旋回体２２を旋回させるとともに、ブーム置台６１を取り去る。 Next, as shown in FIG. 9, the boom undulating rope 41 is wound up to raise the tower 24 diagonally, and the lower jib 25a is lifted by the auxiliary crane 100. Then, the upper swivel body 22 is swiveled and the boom stand 61 is removed.
　次に、図１０に示すように、ブーム起伏ロープ４１を繰り出してタワー２４をほぼ水平に倒伏させ、シーブ４５０に掛けたジブガイライン３６とジブ起伏用上部スプレッダ３７とを接続する。そして、図１１に示すように、ジブ起伏ロープ３８を巻き上げることで、リアストラット２７ｂを持ち上げ、リアストラット２７ｂとフロントストラット２７ａとの間に支柱２７ｄを取り付けることで、ストラット２７を組み立てる。 Next, as shown in FIG. 10, the boom undulating rope 41 is extended to lay down the tower 24 substantially horizontally, and the jib guy line 36 hung on the sheave 450 and the jib undulating upper spreader 37 are connected. Then, as shown in FIG. 11, the rear strut 27b is lifted by winding up the jib undulating rope 38, and the strut 27 is assembled by attaching the support column 27d between the rear strut 27b and the front strut 27a.
　次に、図１２に示すように、ブーム起伏ロープ４１を巻き上げてタワー２４を起こすとともに、ジブ起伏ロープ３８を巻き上げてストラット２７を引き起こし、下部ジブ２５ａをタワーキャップ２４ａから垂下させる。そして、タワー２４の基端部に設けられたリービングウインチ（図示せず）から繰り出したワイヤーＷの先端を、下部ジブ２５ａの背面側（図中左側）のコネクタ８に接続する。 Next, as shown in FIG. 12, the boom undulating rope 41 is wound up to raise the tower 24, and the jib undulating rope 38 is wound up to raise the strut 27, and the lower jib 25a is hung from the tower cap 24a. Then, the tip of the wire W drawn out from the leaving winch (not shown) provided at the base end portion of the tower 24 is connected to the connector 8 on the back side (left side in the drawing) of the lower jib 25a.
　次に、図１３に示すように、リービングウインチでワイヤーを巻き取ることで、矢印で示すように下部ジブ２５ａをタワー２４の下に引き込む。このとき、コネクタ６に取り付けられたガイドローラ４が接地して地面を転動する（図２参照）。そして、図１４に示すように、下部ジブ２５ａを支点２５Ｓ（図３）（第１回動中心軸）周りに略１８０度反転させながら、ブーム起伏ロープ４１を繰り出してタワー２４を降ろす。このとき、ガイドローラ４に代わって、下部ジブ支持脚５に設けられたガイドローラ３が接地して地面を転動する（図２参照）。これにより、下部ジブ２５ａの向きを略１８０度変えることが容易になる。なお、ガイドローラ３、４は、クレーン１の作業姿勢における下部ジブ２５ａの背面部（後面部）の先端部に配置されることが望ましい。 Next, as shown in FIG. 13, by winding the wire with the leaving winch, the lower jib 25a is pulled under the tower 24 as shown by the arrow. At this time, the guide roller 4 attached to the connector 6 touches the ground and rolls on the ground (see FIG. 2). Then, as shown in FIG. 14, the boom undulating rope 41 is extended and the tower 24 is lowered while the lower jib 25a is inverted about 180 degrees around the fulcrum 25S (FIG. 3) (first rotation center axis). At this time, instead of the guide roller 4, the guide roller 3 provided on the lower jib support leg 5 touches the ground and rolls on the ground (see FIG. 2). This makes it easy to change the orientation of the lower jib 25a by approximately 180 degrees. It is desirable that the guide rollers 3 and 4 are arranged at the tip of the back surface (rear surface) of the lower jib 25a in the working posture of the crane 1.
　次に、図１５に示すように、上部ジブ２５ｃが予め接続された中間ジブ２５ｂの背面側（図中上側）のコネクタ２５１と、下部ジブ２５ａの背面側（図中上側）のコネクタ８とをピンで連結する。そして、図１６に示すように、補助クレーン１００で中間ジブ２５ｂを吊り上げ、中間ジブ２５ｂの腹面側（図中下側）のコネクタ２５２と、下部ジブ２５ａの腹面側（図中下側）のコネクタ６とをピンで連結する。 Next, as shown in FIG. 15, the connector 251 on the back side (upper side in the figure) of the intermediate jib 25b to which the upper jib 25c is connected in advance and the connector 8 on the back side (upper side in the figure) of the lower jib 25a are connected. Connect with pins. Then, as shown in FIG. 16, the intermediate jib 25b is lifted by the auxiliary crane 100, and the connector 252 on the ventral side (lower side in the figure) of the intermediate jib 25b and the connector on the ventral side (lower side in the figure) of the lower jib 25a. 6 is connected with a pin.
　以上のように、本実施形態では、倒伏されたタワー本体２４０の先端部にタワーキャップ２４ａが対向して配置され下部ジブ２５ａがタワーキャップ２４ａを挟んでタワー本体２４０の反対側でタワーキャップ２４ａに回動可能に支持されかつストラット２７が下部ジブ２５ａの上方においてタワーキャップ２４ａに回動可能に支持されるとともに支持部２Ｓに載置されるように一体輸送品５１（連結ユニット）が吊り上げられた状態で、下部ジブ２５ａが前記支点２５Ｓ（第１回動中心軸）周りに回動しストラット２７が支点２７ａｓ（第２回動中心軸）周りに回動するとともにストラット２７が支持部２Ｓに接触しながら下部ジブ２５ａがストラット２７に対して前後方向に相対移動することで、タワーキャップ２４ａがタワー本体２４０に対して姿勢変更することを可能とするように、支持部２Ｓがストラット２７を支持する。 As described above, in the present embodiment, the tower cap 24a is arranged to face the tip of the inverted tower body 240, and the lower jib 25a is placed on the tower cap 24a on the opposite side of the tower body 240 with the tower cap 24a in between. The integrally transported product 51 (connecting unit) was lifted so as to be rotatably supported and the strut 27 was rotatably supported by the tower cap 24a above the lower jib 25a and mounted on the support portion 2S. In this state, the lower jib 25a rotates around the fulcrum 25S (first rotation center axis), the strut 27 rotates around the fulcrum 27as (second rotation center axis), and the strut 27 contacts the support portion 2S. While the lower jib 25a moves relative to the strut 27 in the front-rear direction, the support portion 2S supports the strut 27 so that the tower cap 24a can change its posture with respect to the tower body 240. ..
　より詳しくは、吊り上げられた一体輸送品５１のタワーキャップ２４ａのコネクタ２４ｃが倒伏されたタワー本体２４０のコネクタ２４２に対して前後方向において離間して配置されるようにコネクタ２４ｂがコネクタ２４１に回動可能に連結された状態（図６）から、コネクタ２４ｃがコネクタ２４２に近づくようにタワーキャップ２４ａが前記第３回動中心軸周りに回動しタワー本体２４０に対して図７のように姿勢変更することに対応して、下部ジブ２５ａが前記第１回動中心軸周りに回動しストラット２７が前記第２回動中心軸周りに回動するとともに下部ジブ２５ａがストラット２７に対して相対移動しタワー本体２４０（コネクタ２４２）に近づくことを許容するように支持部２Ｓがストラット２７を支持する。 More specifically, the connector 24b rotates to the connector 241 so that the connector 24c of the tower cap 24a of the integrally transported product 51 that has been lifted is arranged apart from the connector 242 of the tower body 240 that has been laid down in the front-rear direction. From the connectable state (FIG. 6), the tower cap 24a rotates around the third rotation center axis so that the connector 24c approaches the connector 242, and the posture of the tower body 240 is changed as shown in FIG. In response to this, the lower jib 25a rotates around the first rotation center axis, the strut 27 rotates around the second rotation center axis, and the lower jib 25a moves relative to the strut 27. The support portion 2S supports the strut 27 so as to allow the tower body 240 (connector 242) to approach.
　なお、上記の組立方法は、準備ステップと、第１連結ステップと、移動ステップと、第２連結ステップとを含む。 The above assembly method includes a preparation step, a first connection step, a movement step, and a second connection step.
　準備ステップでは、タワーキャップ２４ａにストラット２７および下部ジブ２５ａをそれぞれ回動可能に装着し、タワーキャップ２４ａ、ストラット２７および下部ジブ２５ａによって構成される一体輸送品５１（連結ユニット）を準備する。当該準備ステップは、タワーキャップ２４ａ、ストラット２７および下部ジブ２５ａを一体輸送品５１として一体で作業現場まで輸送することを含んでもよい。 In the preparation step, the strut 27 and the lower jib 25a are rotatably attached to the tower cap 24a, and the integrated transport product 51 (connecting unit) composed of the tower cap 24a, the strut 27 and the lower jib 25a is prepared. The preparation step may include transporting the tower cap 24a, the struts 27 and the lower jib 25a together as an integral transport item 51 to the work site.
　第１連結ステップでは、上部旋回体２２に対して倒伏されたタワー本体２４０の先端部にタワーキャップ２４ａが対向して配置され下部ジブ２５ａがタワーキャップ２４ａを挟んでタワー本体２４０の反対側でタワーキャップ２４ａに回動可能に支持されかつストラット２７が下部ジブ２５ａの上方においてタワーキャップ２４ａに回動可能に支持されるように一体輸送品５１のうち少なくともタワーキャップ２４ａおよび下部ジブ２５ａを吊り上げ、倒伏されたタワー本体２４０の先端部（コネクタ２４１）にタワーキャップ２４ａの背面側部分（コネクタ２４ｂ）を前記第１回動中心軸と平行な第３回動中心軸周りに回動可能なように連結する。 In the first connection step, the tower cap 24a is arranged to face the tip of the tower body 240 that has fallen down with respect to the upper swivel body 22, and the lower jib 25a sandwiches the tower cap 24a and the tower is on the opposite side of the tower body 240. At least the tower cap 24a and the lower jib 25a of the integrated transport 51 are lifted and laid down so that they are rotatably supported by the cap 24a and the strut 27 is rotatably supported by the tower cap 24a above the lower jib 25a. The back surface side portion (connector 24b) of the tower cap 24a is connected to the tip end portion (connector 241) of the tower body 240 so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. To do.
　また、移動ステップでは、ストラット２７のうち前記第２回動中心軸よりも先端側部分を下部ジブ２５ａに設けられた支持部２Ｓで支持しながら下部ジブ２５ａをストラット２７に対してタワー本体２４０側に相対移動させるとともにタワーキャップ２４ａを前記第３回動中心軸周りに回動させ、タワーキャップ２４ａの腹面側部分（コネクタ２４ｃ）をタワー本体２４０の前記先端部（コネクタ２４２）まで移動させる。 Further, in the moving step, the lower jib 25a is supported on the tower body 240 side with respect to the strut 27 while the tip side portion of the strut 27 from the second rotation center axis is supported by the support portion 2S provided on the lower jib 25a. The tower cap 24a is rotated around the third rotation center axis, and the ventral side portion (connector 24c) of the tower cap 24a is moved to the tip portion (connector 242) of the tower body 240.
　更に、第２連結ステップでは、タワーキャップ２４ａの腹面側部分（コネクタ２４ｃ）をタワー本体２４０の前記先端部（コネクタ２４２）に連結する。 Further, in the second connection step, the ventral side portion (connector 24c) of the tower cap 24a is connected to the tip portion (connector 242) of the tower body 240.
　（タワークレーンの分解方法）
　次に、タワークレーン１の分解方法について、図４～図１６を参照しつつ説明する。 (How to disassemble the tower crane)
Next, a method of disassembling the tower crane 1 will be described with reference to FIGS. 4 to 16.
　まず、図１の状態からジブ２５をタワー２４に対して屈曲させ、図１６に示すように、ブーム起伏ロープ４１を繰り出してタワー２４を倒伏させる。この結果、ジブ２５がタワー２４の下方に配置される。そして、補助クレーン１００で中間ジブ２５ｂを吊り上げ、中間ジブ２５ｂの腹面側（図中下側）のコネクタ２５２と、下部ジブ２５ａの腹面側（図中下側）のコネクタ６との連結を解除する。 First, the jib 25 is bent with respect to the tower 24 from the state shown in FIG. 1, and as shown in FIG. 16, the boom undulating rope 41 is extended to lay down the tower 24. As a result, the jib 25 is placed below the tower 24. Then, the intermediate jib 25b is lifted by the auxiliary crane 100, and the connection between the connector 252 on the ventral side (lower side in the figure) of the intermediate jib 25b and the connector 6 on the ventral side (lower side in the figure) of the lower jib 25a is released. ..
　次に、図１５に示すように、中間ジブ２５ｂを地上まで降ろし、中間ジブ２５ｂの背面側（図中上側）のコネクタ２５１と、下部ジブ２５ａの背面側（図中上側）のコネクタ８の連結を解除する。そして、図１４に示すように、下部ジブ２５ａ以外のジブ２５を取り外す。 Next, as shown in FIG. 15, the intermediate jib 25b is lowered to the ground, and the connector 251 on the back side (upper side in the figure) of the intermediate jib 25b and the connector 8 on the back side (upper side in the figure) of the lower jib 25a are connected. To cancel. Then, as shown in FIG. 14, the jib 25 other than the lower jib 25a is removed.
　次に、図１３、図１２および図１１に示すように、下部ジブ２５ａを略１８０度反転させるとともに、ブーム起伏ロープ４１を繰り出してタワー２４をほぼ水平に倒伏させる。そして、リアストラット２７ｂとフロントストラット２７ａとの間に取り付けられた支柱２７ｄを取り外す。 Next, as shown in FIGS. 13, 12, and 11, the lower jib 25a is inverted by approximately 180 degrees, and the boom undulating rope 41 is extended to lay down the tower 24 substantially horizontally. Then, the support column 27d attached between the rear strut 27b and the front strut 27a is removed.
　次に、図１０に示すように、ジブ起伏ロープ３８を繰り出すことで、リアストラット２７ｂをフロントストラット２７ａの上に倒し、ジブガイライン３６とジブ起伏用上部スプレッダ３７との接続を解除する。そして、図９に示すように、ブーム起伏ロープ４１を巻き上げてタワー２４を斜めに起こすとともに、補助クレーン１００で下部ジブ２５ａを吊り上げる。そして、タワー２４のタワー本体２４０の下にブーム置台６１を配置する。 Next, as shown in FIG. 10, by feeding out the jib undulating rope 38, the rear strut 27b is tilted over the front strut 27a, and the connection between the jib guy line 36 and the jib undulating upper spreader 37 is released. Then, as shown in FIG. 9, the boom undulating rope 41 is wound up to raise the tower 24 diagonally, and the lower jib 25a is lifted by the auxiliary crane 100. Then, the boom stand 61 is arranged under the tower main body 240 of the tower 24.
　次に、図８に示すように、上部旋回体２２を旋回させるとともに、ブーム起伏ロープ４１を繰り出してタワー２４を倒伏させて、タワー本体２４０の先端部をブーム置台６１の上に載置する。そして、タワーキャップ２４ａとブームガイライン３９との接続を解除する。 Next, as shown in FIG. 8, the upper swivel body 22 is swiveled, and the boom undulating rope 41 is extended to lay down the tower 24, and the tip of the tower main body 240 is placed on the boom stand 61. Then, the connection between the tower cap 24a and the boom guy line 39 is released.
　次に、図７に示すように、三角ガイド４５を倒してストラット２７の上に寝かせる。そして、下部ジブ２５ａの先端側を補助クレーン１００で吊り、タワーキャップ２４ａの腹面側部分（図中下側部分）のコネクタ２４ｃとタワー本体２４０のコネクタ２４２との連結を解除する。その後、図６に示すように、ストラット２７の下部ジブ２５ａ側の面２７ｅをローラ１１で支持しながら、下部ジブ２５ａの先端がフロントストラット２７ａの先端に位置するまで、下部ジブ２５ａを前方に移動させる。そして、連結部材１２とフロントストラット２７ａとをピンで連結することで、ストラット２７と下部ジブ２５ａとを連結する。 Next, as shown in FIG. 7, the triangular guide 45 is tilted down and laid on the strut 27. Then, the tip end side of the lower jib 25a is suspended by the auxiliary crane 100, and the connection between the connector 24c of the ventral side portion (lower portion in the drawing) of the tower cap 24a and the connector 242 of the tower body 240 is released. After that, as shown in FIG. 6, while supporting the surface 27e on the lower jib 25a side of the strut 27 with the roller 11, the lower jib 25a is moved forward until the tip of the lower jib 25a is located at the tip of the front strut 27a. Let me. Then, the strut 27 and the lower jib 25a are connected by connecting the connecting member 12 and the front strut 27a with a pin.
　次に、図５に示すように、補助クレーン１００で一体輸送品５１を持ち上げ、タワーキャップ２４ａの背面側部分（図中上側部分）のコネクタ２４ｂとタワー本体２４０のコネクタ２４１との連結を解除する。そして、図４に示すように、一体輸送品５１をタワー本体２４０から離れた位置まで移動させる。タワーキャップ２４ａとストラット２７と下部ジブ２５ａとを一体で輸送することで、これらを分解する必要がないので、作業効率を向上させることができる。また、輸送時にストラット２７と下部ジブ２５ａとを連結部材１２で連結することで、輸送中に下部ジブ２５ａがストラット２７に対して相対移動するのを抑制することができる。この結果、輸送中にタワーキャップ２４ａの姿勢が変化するのを抑制することができるので、輸送中の荷崩れを抑制することができる。 Next, as shown in FIG. 5, the integrated transport product 51 is lifted by the auxiliary crane 100, and the connection between the connector 24b on the back side portion (upper portion in the drawing) of the tower cap 24a and the connector 241 of the tower body 240 is released. .. Then, as shown in FIG. 4, the integrally transported product 51 is moved to a position away from the tower main body 240. By integrally transporting the tower cap 24a, the strut 27, and the lower jib 25a, it is not necessary to disassemble them, so that the work efficiency can be improved. Further, by connecting the strut 27 and the lower jib 25a with the connecting member 12 during transportation, it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation. As a result, it is possible to suppress the posture of the tower cap 24a from changing during transportation, so that it is possible to suppress the collapse of the load during transportation.
　以上に述べたように、本実施形態に係るタワークレーン１、および、タワークレーン１の組立方法によれば、タワー２４のタワー本体２４０の先端部にタワーキャップ２４ａが連結される際に、吊り上げられた一体輸送品５１全体の姿勢を大きく変えることなく、タワーキャップ２４ａの姿勢を変更することができる。このため、一体輸送品５１が周囲の部材に干渉することを抑止しながら、タワーキャップ２４ａをタワー本体２４０に連結することが可能となる。特に、タワーキャップ２４ａの背面側部分がタワー本体２４０に連結された状態で、ストラット２７の下部ジブ２５ａ側の面２７ｅがローラ１１で支持されながら、下部ジブ２５ａがタワー本体２４０の方に移動される。これにより、タワーキャップ２４ａの背面側部分がタワー本体２４０に連結された状態のタワーキャップ２４ａの姿勢を変化させることができる。この結果、タワーキャップ２４ａの腹面側部分とタワー本体２４０とを連結するのに適した姿勢に、タワーキャップ２４ａの姿勢を変化させることができる。よって、倒伏されたタワー本体２４０の先端部にタワーキャップ２４ａを容易に連結することができる。 As described above, according to the tower crane 1 and the method of assembling the tower crane 1 according to the present embodiment, the tower cap 24a is lifted when the tower cap 24a is connected to the tip of the tower main body 240 of the tower 24. The posture of the tower cap 24a can be changed without significantly changing the posture of the entire integrated transport product 51. Therefore, it is possible to connect the tower cap 24a to the tower main body 240 while preventing the integrally transported product 51 from interfering with the surrounding members. In particular, in a state where the back side portion of the tower cap 24a is connected to the tower body 240, the lower jib 25a is moved toward the tower body 240 while the surface 27e on the lower jib 25a side of the strut 27 is supported by the roller 11. To the tower. As a result, the posture of the tower cap 24a in a state where the back surface side portion of the tower cap 24a is connected to the tower main body 240 can be changed. As a result, the posture of the tower cap 24a can be changed to a posture suitable for connecting the ventral side portion of the tower cap 24a and the tower main body 240. Therefore, the tower cap 24a can be easily connected to the tip end portion of the collapsed tower body 240.
　また、本実施形態に係るタワークレーン１によれば、ストラット２７と下部ジブ２５ａとを連結部材１２で連結可能である。このため、輸送時にストラット２７と下部ジブ２５ａとを連結した場合には、輸送中に下部ジブ２５ａがストラット２７に対して相対移動するのを抑制することができる。この結果、輸送中にタワーキャップ２４ａの姿勢が変化するのを抑制することができるので、輸送中の荷崩れを抑制することができるため、各部材の損傷が抑止される。 Further, according to the tower crane 1 according to the present embodiment, the strut 27 and the lower jib 25a can be connected by the connecting member 12. Therefore, when the strut 27 and the lower jib 25a are connected during transportation, it is possible to prevent the lower jib 25a from moving relative to the strut 27 during transportation. As a result, it is possible to suppress the posture of the tower cap 24a from changing during transportation, so that it is possible to suppress the collapse of the load during transportation, and thus damage to each member is suppressed.
　また、本実施形態に係るタワークレーン１によれば、下部ジブ２５ａに対して回転自在なローラ１１で、ストラット２７の下部ジブ２５ａ側の面２７ｅを支持する。ストラット２７の下部ジブ２５ａ側の面２７ｅを支持するローラ１１の回転により、ストラット２７に対して下部ジブ２５ａを好適に相対移動させる（滑らせる）ことができる。 Further, according to the tower crane 1 according to the present embodiment, the roller 11 that is rotatable with respect to the lower jib 25a supports the surface 27e on the lower jib 25a side of the strut 27. The rotation of the roller 11 that supports the surface 27e on the lower jib 25a side of the strut 27 allows the lower jib 25a to be suitably moved (slipped) relative to the strut 27.
　また、本実施形態に係るタワークレーン１は、下部ジブ２５ａのストラット２７側部分（図２の下部ジブ２５ａの上面部）に設けられ、地面を転動することが可能なガイドローラ３，４を有している。地面の上でガイドローラ３，４を転動させることで、下部ジブ２５ａの向きを略１８０度変えることが容易になる。 Further, the tower crane 1 according to the present embodiment is provided on the strut 27 side portion of the lower jib 25a (the upper surface portion of the lower jib 25a in FIG. 2), and guide rollers 3 and 4 capable of rolling on the ground are provided. Have. By rolling the guide rollers 3 and 4 on the ground, it becomes easy to change the direction of the lower jib 25a by approximately 180 degrees.
　また、本実施形態に係るタワークレーン１の組立方法によれば、タワーキャップ２４ａと、ストラット２７と、下部ジブ２５ａとが一体で輸送される。これにより、タワーキャップ２４ａと、ストラット２７と、下部ジブ２５ａとを組み立てたり、分解したりする必要がないので、作業効率を向上させることができる。 Further, according to the assembly method of the tower crane 1 according to the present embodiment, the tower cap 24a, the strut 27, and the lower jib 25a are integrally transported. As a result, it is not necessary to assemble or disassemble the tower cap 24a, the strut 27, and the lower jib 25a, so that the work efficiency can be improved.
　以上、本発明の実施形態を説明したが、具体例を例示したに過ぎず、特に本発明を限定するものではなく、具体的構成などは、適宜設計変更可能である。また、発明の実施の形態に記載された、作用及び効果は、本発明から生じる最も好適な作用及び効果を列挙したに過ぎず、本発明による作用及び効果は、本発明の実施の形態に記載されたものに限定されるものではない。上記の一体輸送品５１（連結ユニット）は、三角ガイド４５を含まないものでもよい。 Although the embodiments of the present invention have been described above, they merely exemplify specific examples, and the present invention is not particularly limited, and specific configurations and the like can be appropriately redesigned. In addition, the actions and effects described in the embodiments of the present invention merely list the most preferable actions and effects arising from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what has been done. The integrated transportation product 51 (connecting unit) may not include the triangular guide 45.
　本発明によって提供されるのはクレーンであって、当該クレーンは、クレーン本体と、前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、前記ブームおよび前記ジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブを起伏可能に支持するストラットと、前記下部ジブに装着され、前記ストラットのうち前記第２回動中心軸よりも先端側部分を支持することが可能な支持部と、を備える。前記ストラットと前記下部ジブとが前記ブームヘッドに装着され前記ストラットが前記支持部に載置されることで前記ストラット、前記下部ジブおよび前記ブームヘッドが連結ユニットを構成し、前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記連結ユニットが一体で連結されることが可能であり、前記倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持されかつ前記支持部に載置されるように前記連結ユニットが吊り上げられた状態で、前記下部ジブが前記第１回動中心軸周りに回動し前記ストラットが前記第２回動中心軸周りに回動するとともに前記ストラットが前記支持部に接触しながら前記下部ジブが前記ストラットに対して前後方向に相対移動することで、前記ブームヘッドが前記ブーム本体に対して姿勢変更することを可能とするように、前記支持部が前記ストラットを支持する。 Provided by the present invention is a crane, which is a crane body, a base end portion rotatably supported by the crane body in an undulating direction, and a tip portion opposite to the base end portion. A boom including a boom body and a boom head detachably connected to the tip of the boom body, and the boom so as to be rotatable in an undulating direction around a horizontal first rotation center axis. A jib having a lower jib supported by a boom head and a jib connector detachably connected to the tip of the lower jib, and the boom and the jib behind the lower jib in an upright position. A strut supported by the boom head so as to be rotatable around a second rotation center axis parallel to the first rotation center axis and undulatingly support the jib, and a strut attached to the lower jib and mounted on the lower jib. Of these, a support portion capable of supporting a portion on the tip side of the second rotation center axis is provided. The strut and the lower jib are mounted on the boom head, and the strut is placed on the support portion, so that the strut, the lower jib, and the boom head form a connecting unit with respect to the crane body. The connecting unit can be integrally connected to the tip of the collapsed boom body, and the boom head is arranged to face the tip of the collapsed boom body and the lower jib. Is rotatably supported by the boom head on the opposite side of the boom body across the boom head, and the struts are rotatably supported by the boom head above the lower jib and mounted on the support portion. With the connecting unit lifted so that it can be placed, the lower jib rotates around the first rotation center axis, the struts rotate around the second rotation center axis, and the struts rotate. The support portion moves relative to the strut in the front-rear direction while contacting the support portion, so that the boom head can change its posture with respect to the boom body. Supports the struts.
　本構成によれば、ブームヘッドとストラットと下部ジブとが連結ユニットとして一体で吊り上げられた状態で、ブームヘッドをブーム本体に対して姿勢変更する際に、下部ジブおよびストラットがそれぞれ回動可能であるとともに下部ジブがストラットに対して前後に相対移動することができるため、連結ユニット全体の姿勢を大きく変えることなく、ブームヘッドの姿勢を変更することができる。このため、連結ユニットが周囲の部材に干渉することを抑止しながら、ブームヘッドをブーム本体に連結することが可能となる。 According to this configuration, when the boom head, struts, and lower jib are integrally lifted as a connecting unit and the posture of the boom head is changed with respect to the boom body, the lower jib and struts can rotate respectively. At the same time, since the lower jib can move relative to the strut back and forth, the posture of the boom head can be changed without significantly changing the posture of the entire connecting unit. Therefore, it is possible to connect the boom head to the boom body while suppressing the connecting unit from interfering with the surrounding members.
　上記の構成において、前記ブーム本体は、当該ブーム本体が前記クレーン本体に対して倒伏した状態で、前記ブーム本体の先端部に配置される第１本体連結部と前記ブーム本体の前記先端部において前記第１本体連結部の下方に配置される第２本体連結部とを有し、前記ブームヘッドは、前記第１回動中心軸と平行な第３回動中心軸周りに回動可能なように前記第１本体連結部に連結される第１ヘッド連結部と前記第２本体連結部に連結される第２ヘッド連結部とを有し、吊り上げられた前記連結ユニットの前記ブームヘッドの前記第２ヘッド連結部が倒伏された前記ブーム本体の前記第２本体連結部に対して前後方向において離間して配置されるように前記第１ヘッド連結部が前記第１本体連結部に回動可能に連結された状態から、前記第２ヘッド連結部が前記第２本体連結部に近づくように前記ブームヘッドが前記第３回動中心軸周りに回動し前記ブーム本体に対して姿勢変更することに対応して、前記下部ジブが前記第１回動中心軸周りに回動し前記ストラットが前記第２回動中心軸周りに回動するとともに前記下部ジブが前記ストラットに対して相対移動し前記第２本体連結部に近づくことを許容するように前記支持部が前記ストラットを支持することが望ましい。 In the above configuration, the boom main body is the first main body connecting portion arranged at the tip end portion of the boom main body and the tip end portion of the boom main body in a state where the boom main body is laid down with respect to the crane main body. It has a second main body connecting portion arranged below the first main body connecting portion, and the boom head can rotate around a third rotation central axis parallel to the first rotation central axis. The second head of the boom head of the hoisted connecting unit having a first head connecting portion connected to the first main body connecting portion and a second head connecting portion connected to the second main body connecting portion. The first head connecting portion is rotatably connected to the first main body connecting portion so that the head connecting portion is arranged apart from the second main body connecting portion of the boom main body in the front-rear direction. From this state, the boom head rotates around the third rotation center axis so that the second head connecting portion approaches the second main body connecting portion, and the posture of the boom body is changed with respect to the boom main body. Then, the lower jib rotates around the first rotation center axis, the strut rotates around the second rotation center axis, and the lower jib moves relative to the strut, and the second It is desirable for the support to support the strut so as to allow it to approach the body connection.
　本構成によれば、ブーム本体の先端部にブームヘッドが連結される際に、ブームヘッドの第１ヘッド連結部（背面側部分）がブーム本体の第１本体連結部に連結された状態で、ストラットが支持部によって支持されながら下部ジブがブーム本体の方に移動される。これにより、第１ヘッド連結部がブーム本体に連結された状態のブームヘッドの姿勢を変化させることができる。この結果、ブームヘッドの第２ヘッド連結部（腹面側部分）とブーム本体の第２本体連結部とを連結するのに適した姿勢に、ブームヘッドの姿勢を変化させることができる。よって、倒伏されたブーム本体の先端部にブームヘッドを容易に連結することができる。 According to this configuration, when the boom head is connected to the tip of the boom body, the first head connecting portion (rear side portion) of the boom head is connected to the first main body connecting portion of the boom body. The lower jib is moved towards the boom body while the struts are supported by the support. As a result, the posture of the boom head in a state where the first head connecting portion is connected to the boom body can be changed. As a result, the posture of the boom head can be changed to a posture suitable for connecting the second head connecting portion (ventral surface side portion) of the boom head and the second main body connecting portion of the boom body. Therefore, the boom head can be easily connected to the tip of the collapsed boom body.
　上記の構成において、前記ストラットが前記支持部に載置された状態で前記下部ジブが前記ストラットに対して前後方向に相対移動することを阻止する移動阻止状態と前記ストラットが前記支持部に載置された状態で前記下部ジブが前記ストラットに対して前後方向に相対移動することを許容する移動許容状態とに切換可能なように前記ストラットと前記下部ジブとを互いに連結可能な連結部材を更に備えることが望ましい。 In the above configuration, a movement blocking state in which the lower jib is prevented from moving relative to the strut in the front-rear direction while the strut is mounted on the support portion and the strut is mounted on the support portion. A connecting member capable of connecting the strut and the lower jib to each other is further provided so that the lower jib can be switched to a movement-allowed state in which the lower jib is allowed to move relative to the strut in the front-rear direction. Is desirable.
　本構成によれば、輸送中に下部ジブがストラットに対して相対移動するのを抑制することができるため、輸送中の荷崩れを抑制することができる。 According to this configuration, it is possible to suppress the lower jib from moving relative to the strut during transportation, so that the load collapse during transportation can be suppressed.
　上記の構成において、前記支持部は、前記ストラットを支持することが可能な外周面を含み、当該外周面に支持された前記ストラットが前記下部ジブに対して前後方向に相対移動するように前記第１回転中心軸と平行な回転軸周りに回転自在な支持ローラを有することが望ましい。 In the above configuration, the support portion includes an outer peripheral surface capable of supporting the strut, and the strut supported by the outer peripheral surface moves relative to the lower jib in the front-rear direction. It is desirable to have a rotatable support roller around a rotation axis parallel to one rotation center axis.
　本構成によれば、支持ローラの回転により、ストラットに対して下部ジブを安定して相対移動させる（滑らせる）ことができる。 According to this configuration, the lower jib can be stably moved (slipped) relative to the strut by the rotation of the support roller.
　上記の構成において、前記ブームが前記クレーン本体に対して倒伏し前記下部ジブが前記ブームの下方に配置された状態において地面を転動することが可能なように前記下部ジブに装着された回転部材を更に備えることが望ましい。 In the above configuration, a rotating member mounted on the lower jib so that the boom can lie down with respect to the crane body and roll on the ground with the lower jib placed below the boom. It is desirable to further prepare.
　本構成によれば、地面の上で回転部材を転動させることで、組立分解時にブームの下方で下部ジブの向きを容易に変えることができる。 According to this configuration, by rolling the rotating member on the ground, the direction of the lower jib can be easily changed below the boom during assembly and disassembly.
　本発明によって提供されるのは、クレーン本体と、前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、前記ブームおよび前記ジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブの起伏における支柱となるストラットと、を備えるクレーンの組立方法である。当該組立方法は、前記ブームヘッドに前記ストラットおよび前記下部ジブをそれぞれ回動可能に装着し、前記ブームヘッド、前記ストラットおよび前記下部ジブによって構成される連結ユニットを準備する準備ステップと、前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持され前記支持部に載置されるように前記連結ユニットのうち少なくとも前記ブームヘッドおよび前記下部ジブを吊り上げ、倒伏された前記ブーム本体の先端部に前記ブームヘッドの背面側部分を前記第１回動中心軸と平行な第３回動中心軸周りに回動可能なように連結する第１連結ステップと、前記ストラットのうち前記第２回動中心軸よりも先端側部分を前記下部ジブに設けられた支持部で支持しながら前記下部ジブを前記ストラットに対して前記ブーム本体側に相対移動させるとともに前記ブームヘッドを前記第３回動中心軸周りに回動させ、前記ブームヘッドの腹面側部分を前記ブーム本体の前記先端部まで移動させる移動ステップと、前記ブームヘッドの前記腹面側部分を前記ブーム本体の前記先端部に連結する第２連結ステップと、を備える。 Provided by the present invention are a crane body, a boom body including a base end portion rotatably supported by the crane body in an undulating direction, and a tip end portion opposite to the base end portion. A boom having a boom head detachably connected to the tip of the boom body, and a lower jib supported by the boom head so as to be rotatable in an undulating direction around a horizontal first rotation center axis. And a jib having a jib connecting body detachably connected to the tip of the lower jib, and parallel to the first rotation center axis behind the boom and the lower jib in a state where the jib is upright. This is a method of assembling a crane including struts that are supported by the boom head so as to be rotatable around a second rotation center axis and serve as columns for undulations of the jib. The assembly method includes a preparatory step in which the strut and the lower jib are rotatably attached to the boom head to prepare a connecting unit composed of the boom head, the strut and the lower jib, and the crane main body. The boom head is arranged to face the tip of the boom body that has been laid down, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between. At least the boom head and the lower jib of the connecting unit are lifted and laid down so that the struts are rotatably supported by the boom head above the lower jib and placed on the support portion. Of the struts, the first connecting step of connecting the back surface side portion of the boom head to the tip of the boom body so as to be rotatable around the third rotation center axis parallel to the first rotation center axis. While supporting a portion on the tip end side of the second rotation center axis with a support portion provided on the lower jib, the lower jib is moved relative to the strut toward the boom body, and the boom head is moved to the first. 3 A movement step of rotating the boom head around the central axis to move the ventral side portion of the boom head to the tip portion of the boom body, and moving the ventral surface side portion of the boom head to the tip portion of the boom body. A second connecting step for connecting is provided.
　本方法によれば、ブームヘッドとストラットと下部ジブとが連結ユニットとして一体で吊り上げられた状態で、ブームヘッドをブーム本体に連結する際に、下部ジブおよびストラットがそれぞれ回動可能であるとともに下部ジブがストラットに対して相対移動することができるため、連結ユニット全体の姿勢を大きく変えることなく、ブームヘッドの姿勢を変更しブーム本体に容易に連結することができる。 According to this method, when the boom head, the strut, and the lower jib are integrally lifted as a connecting unit and the boom head is connected to the boom body, the lower jib and the strut are rotatable and the lower part, respectively. Since the jib can move relative to the strut, the posture of the boom head can be changed and the jib can be easily connected to the boom body without significantly changing the posture of the entire connecting unit.
　上記の方法において、前記準備ステップは、前記第１連結ステップの前に、前記ブームヘッド、前記ストラットおよび前記下部ジブを前記連結ユニットとして一体で輸送することを含むことが望ましい。 In the above method, it is desirable that the preparatory step includes transporting the boom head, the strut and the lower jib integrally as the connecting unit before the first connecting step.
　本方法によれば、輸送時にブームヘッドとストラットと下部ジブとを組み立てたり分解したりする必要がないので、準備ステップにおける作業効率を向上させることができる。

  According to this method, it is not necessary to assemble or disassemble the boom head, the strut, and the lower jib during transportation, so that the work efficiency in the preparation step can be improved.

Claims (7)

  1. 　クレーンであって、
    　クレーン本体と、
    　前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、
    　水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、
    　前記ブームおよびジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブを起伏可能に支持するストラットと、
    　前記下部ジブに装着され、前記ストラットのうち前記第２回動中心軸よりも先端側部分を支持することが可能な支持部と、
    　を備え、
    　前記ストラットと前記下部ジブとが前記ブームヘッドに装着され前記ストラットが前記支持部に載置されることで前記ストラット、前記下部ジブおよび前記ブームヘッドが連結ユニットを構成し、前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記連結ユニットが一体で連結されることが可能であり、
    　前記倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持されかつ前記支持部に載置されるように前記連結ユニットが吊り上げられた状態で、前記下部ジブが前記第１回動中心軸周りに回動し前記ストラットが前記第２回動中心軸周りに回動するとともに前記ストラットが前記支持部に接触しながら前記下部ジブが前記ストラットに対して前後方向に相対移動することで、前記ブームヘッドが前記ブーム本体に対して姿勢変更することを可能とするように、前記支持部が前記ストラットを支持する、クレーン。     It ’s a crane,
    Crane body and
    A boom main body including a base end portion rotatably supported by the crane main body in an undulating direction and a tip end portion on the opposite side of the base end portion is detachably connected to the tip end portion of the boom body. With a boom head, with a boom,
    It has a lower jib supported by the boom head so as to be rotatable around a horizontal first rotation center axis in an undulating direction, and a jib connector detachably connected to the tip of the lower jib. With jib
    The jib is supported by the boom head so as to be rotatable around a second rotation center axis parallel to the first rotation center axis behind the lower jib in an upright state of the boom and jib, and the jib is undulated. With struts that support as much as possible
    A support portion mounted on the lower jib and capable of supporting a portion of the strut on the tip side of the second rotation center axis.
    With
    The strut and the lower jib are mounted on the boom head, and the strut is placed on the support portion so that the strut, the lower jib, and the boom head form a connecting unit with respect to the crane body. The connecting unit can be integrally connected to the tip of the collapsed boom body.
    The boom head is arranged to face the tip of the collapsed boom body, and the lower jib is rotatably supported by the boom head on the opposite side of the boom body with the boom head in between. With the connecting unit lifted so that the struts are rotatably supported by the boom head above the lower jib and mounted on the support, the lower jib is the first rotation center axis. The strut rotates around the second rotation center axis, and the lower jib moves relative to the strut in the front-rear direction while the strut is in contact with the support portion. A crane in which the support portion supports the strut so that the boom head can change its posture with respect to the boom body.
  2. 　前記ブーム本体は、当該ブーム本体が前記クレーン本体に対して倒伏した状態で、前記ブーム本体の先端部に配置される第１本体連結部と前記ブーム本体の前記先端部において前記第１本体連結部の下方に配置される第２本体連結部とを有し、
    　前記ブームヘッドは、前記第１回動中心軸と平行な第３回動中心軸周りに回動可能なように前記第１本体連結部に連結される第１ヘッド連結部と前記第２本体連結部に連結される第２ヘッド連結部とを有し、
    　吊り上げられた前記連結ユニットの前記ブームヘッドの前記第２ヘッド連結部が倒伏された前記ブーム本体の前記第２本体連結部に対して前後方向において離間して配置されるように前記第１ヘッド連結部が前記第１本体連結部に回動可能に連結された状態から、前記第２ヘッド連結部が前記第２本体連結部に近づくように前記ブームヘッドが前記第３回動中心軸周りに回動し前記ブーム本体に対して姿勢変更することに対応して、前記下部ジブが前記第１回動中心軸周りに回動し前記ストラットが前記第２回動中心軸周りに回動するとともに前記下部ジブが前記ストラットに対して相対移動し前記第２本体連結部に近づくことを許容するように前記支持部が前記ストラットを支持する、請求項１に記載のクレーン。     The boom main body has a first main body connecting portion arranged at the tip of the boom main body and the first main body connecting portion at the tip of the boom main body in a state where the boom main body is laid down with respect to the crane main body. It has a second main body connecting part arranged below the
    The boom head is connected to the first main body connecting portion and the second main body connecting portion so as to be rotatable around a third rotation central axis parallel to the first rotation central axis. It has a second head connecting part that is connected to the part,
    The first head connection so that the second head connection portion of the boom head of the lifted connection unit is arranged apart from the second main body connection portion of the boom main body in the front-rear direction. The boom head rotates around the third rotation center axis so that the second head connecting portion approaches the second main body connecting portion from the state in which the portion is rotatably connected to the first main body connecting portion. The lower jib rotates around the first rotation center axis, the strut rotates around the second rotation center axis, and the strut rotates around the second rotation center axis in response to the movement and the posture change with respect to the boom body. The crane according to claim 1, wherein the support portion supports the strut so that the lower jib moves relative to the strut and approaches the second main body connecting portion.
  3. 　前記ストラットが前記支持部に載置された状態で前記下部ジブが前記ストラットに対して前後方向に相対移動することを阻止する移動阻止状態と前記ストラットが前記支持部に載置された状態で前記下部ジブが前記ストラットに対して前後方向に相対移動することを許容する移動許容状態とに切換可能なように前記ストラットと前記下部ジブとを互いに連結可能な連結部材を更に備える、請求項１に記載のクレーン。 The movement-blocking state in which the lower jib is prevented from moving relative to the strut in the front-rear direction while the strut is mounted on the support portion, and the strut is mounted on the support portion. The first aspect of the present invention further comprises a connecting member capable of connecting the strut and the lower jib to each other so that the lower jib can be switched to a movement allowable state that allows the lower jib to move relative to the strut in the front-rear direction. The listed crane.
  4. 　前記支持部は、前記ストラットを支持することが可能な外周面を含み、当該外周面に支持された前記ストラットが前記下部ジブに対して前後方向に相対移動するように前記第１回転中心軸と平行な回転軸周りに回転自在な支持ローラを有する、請求項１乃至３の何れか１項に記載のクレーン。 The support portion includes an outer peripheral surface capable of supporting the strut, and with the first rotation central axis so that the strut supported by the outer peripheral surface moves relative to the lower jib in the front-rear direction. The crane according to any one of claims 1 to 3, which has a rotatable support roller around a parallel rotation axis.
  5. 　前記ブームが前記クレーン本体に対して倒伏し前記下部ジブが前記ブームの下方に配置された状態において地面を転動することが可能なように前記下部ジブに装着された回転部材を更に備える、請求項１乃至４の何れか１項に記載のクレーン。 A claim further comprising a rotating member mounted on the lower jib so that the boom can lie down with respect to the crane body and roll on the ground with the lower jib located below the boom. Item 6. The crane according to any one of Items 1 to 4.
  6. 　クレーン本体と、
    　前記クレーン本体に起伏方向に回動可能に支持される基端部と当該基端部とは反対側の先端部とを含むブーム本体と、前記ブーム本体の前記先端部に着脱可能に連結されるブームヘッドと、を有するブームと、
    　水平な第１回動中心軸周りに起伏方向に回動可能なように前記ブームヘッドに支持される下部ジブと、前記下部ジブの先端部に着脱可能に連結されるジブ連結体と、を有するジブと、
    　前記ブームおよび前記ジブが起立した状態における前記下部ジブの後方で前記第１回動中心軸と平行な第２回動中心軸周りに回動可能なように前記ブームヘッドに支持され、前記ジブを起伏可能に支持するストラットと、を備えるクレーンの組立方法であって、
    　前記ブームヘッドに前記ストラットおよび前記下部ジブをそれぞれ回動可能に装着し、前記ブームヘッド、前記ストラットおよび前記下部ジブによって構成される連結ユニットを準備する準備ステップと、
    　前記クレーン本体に対して倒伏された前記ブーム本体の前記先端部に前記ブームヘッドが対向して配置され前記下部ジブが前記ブームヘッドを挟んで前記ブーム本体の反対側で前記ブームヘッドに回動可能に支持されかつ前記ストラットが前記下部ジブの上方において前記ブームヘッドに回動可能に支持され前記下部ジブに設けられた支持部に載置されるように前記連結ユニットのうち少なくとも前記ブームヘッドおよび前記下部ジブを吊り上げ、倒伏された前記ブーム本体の先端部に前記ブームヘッドの背面側部分を前記第１回動中心軸と平行な第３回動中心軸周りに回動可能に連結する第１連結ステップと、
    　前記ストラットのうち前記第２回動中心軸よりも先端側部分を前記支持部で支持しながら前記下部ジブを前記ストラットに対して前記ブーム本体側に相対移動させるとともに前記ブームヘッドを前記第３回動中心軸周りに回動させ、前記ブームヘッドの腹面側部分を前記ブーム本体の前記先端部まで移動させる移動ステップと、
    　前記ブームヘッドの前記腹面側部分を前記ブーム本体の前記先端部に連結する第２連結ステップと、
    を備える、クレーンの組立方法。     Crane body and
    A boom main body including a base end portion rotatably supported by the crane main body in an undulating direction and a tip end portion on the opposite side of the base end portion is detachably connected to the tip end portion of the boom body. With a boom head, with a boom,
    It has a lower jib supported by the boom head so as to be rotatable around a horizontal first rotation center axis in an undulating direction, and a jib connector detachably connected to the tip of the lower jib. With jib
    The jib is supported by the boom head so as to be rotatable around a second rotation center axis parallel to the first rotation center axis behind the lower jib in a state where the boom and the jib are upright. A method of assembling a crane equipped with undulating support struts.
    A preparatory step in which the strut and the lower jib are rotatably attached to the boom head to prepare a connecting unit composed of the boom head, the strut and the lower jib.
    The boom head is arranged to face the tip of the boom body that is laid down with respect to the crane body, and the lower jib can rotate to the boom head on the opposite side of the boom body with the boom head in between. At least the boom head and the boom head of the connecting unit so that the struts are rotatably supported by the boom head above the lower jib and mounted on a support provided on the lower jib. The first connection in which the lower jib is lifted and the back surface side portion of the boom head is rotatably connected to the tip end portion of the collapsed boom body around the third rotation center axis parallel to the first rotation center axis. Steps and
    While supporting the tip side portion of the strut with respect to the second rotation center axis by the support portion, the lower jib is relatively moved toward the boom body side with respect to the strut, and the boom head is moved to the third stage. A moving step of rotating the boom head around the center axis of movement to move the ventral side portion of the boom head to the tip portion of the boom body.
    A second connecting step of connecting the ventral side portion of the boom head to the tip portion of the boom body,
    How to assemble a crane.
  7. 　前記準備ステップは、前記第１連結ステップの前に、前記ブームヘッド、前記ストラットおよび前記下部ジブを前記連結ユニットとして一体で輸送することを含む、請求項６に記載のクレーンの組立方法。

          The method for assembling a crane according to claim 6, wherein the preparation step includes integrally transporting the boom head, the strut, and the lower jib as the connecting unit before the first connecting step.
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JP2014065573A (en) * 2012-09-26 2014-04-17 Kobelco Cranes Co Ltd Lower gib
JP2014114101A (en) * 2012-12-07 2014-06-26 Kobelco Cranes Co Ltd Disassembling transport method of boom head in crawler crane
JP2016222392A (en) * 2015-05-29 2016-12-28 コベルコクレーン株式会社 Mobile crane and boom standing method of mobile crane
JP2017137164A (en) * 2016-02-03 2017-08-10 コベルコクレーン株式会社 Method for mounting jib of crane
JP2019069838A (en) * 2017-10-06 2019-05-09 住友重機械建機クレーン株式会社 Crane and jib assembling method

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JP2014065573A (en) * 2012-09-26 2014-04-17 Kobelco Cranes Co Ltd Lower gib
JP2014114101A (en) * 2012-12-07 2014-06-26 Kobelco Cranes Co Ltd Disassembling transport method of boom head in crawler crane
JP2016222392A (en) * 2015-05-29 2016-12-28 コベルコクレーン株式会社 Mobile crane and boom standing method of mobile crane
JP2017137164A (en) * 2016-02-03 2017-08-10 コベルコクレーン株式会社 Method for mounting jib of crane
JP2019069838A (en) * 2017-10-06 2019-05-09 住友重機械建機クレーン株式会社 Crane and jib assembling method

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