Traveling crane and assembling/disassembling method thereof

A traveling crane comprising:

• a base machine having a boom derrickably attached thereto at one end of the boom and a jib derrickably attached to the other end of the boom;
• a jib derricking device for raising and lowering the jib;
• and
• a hook hoisting device for hanging up and down a lifting hook from an end of the jib,
• the jib derricking device comprising:
• a jib derricking winch mounted on the base machine;
• a jib derricking rope wound/rewound by the jib derricking winch;
• lower and upper spreaders around which the jib derricking rope is routed for raising and lowering the jib;
• a strut attached to the top of the boom rotatably about a horizontal axis in a fore-and-aft direction;
• a jib guyline connecting the strut to the jib;
• and
• a strut guyline connecting the strut to the upper spreader,
• the hook hoisting device comprising:
• a hook hoisting winch mounted on the base machine;
• a hook hoisting rope wound/rewound by the hook hoisting winch;
• and
• a hook hoisting guide sheave for guiding the hook hoisting rope from the top of the boom toward the end of the jib,
• wherein the hook hoisting guide sheave is arranged on the top of the boom in a state that the guide sheave can guide the hook hoisting rope along the upper surface of the boom by folding back the rope toward the upper spreader placed at a position adjacent to a boom anchor during assembling/disassembling of the traveling crane,
• further comprising spreader guiding means for guiding the upper spreader along the upper surface of the boom from the boom anchor toward a far end of the boom.