Rotating superstructure and crane

1. A rotating superstructure, comprising:

a front block on which is arranged a power unit that includes a prime mover; and

a rear block on which is arranged a unit for raising and lowering a boom that includes a winch and a sheave,

wherein:

the rotating superstructure is configured to be split into the front block and the rear block;

a first abutment section having a first abutment surface is provided at an end of the front block at a side joining with the rear block, the first abutment section being a plate-like member;

a second abutment section having a second abutment surface is provided at an end of the rear block at a side joining with the front block, the second abutment section being a plate-like member; and

when the front block and the rear block are joined together, the first abutment surface of the first abutment section and the second abutment surface of the second abutment section contact each other in face contact to receive compressive forces.

2. A rotating superstructure according to claim 1 , further comprising:

a pin that is provided on either one of the front block and the rear block so as to join the front block and the rear block each other;

a pin fix member that is provided on the other one of the front block and the rear block, includes a guiding section so as to guide the pin to a fixed position when the front block and the rear block are joined to each other, and includes a lock section that locks the pin at the fixed position so as to prevent the front block and the rear block from being separated after the pin is guided to the fixed position.

3. A rotating superstructure according to claim 1 , further comprising:

a mast for raising and lowering a boom, wherein

the rear block includes a member on which the mast is placed during transportation.

4. A rotating superstructure according to claim 1 , wherein

the rotating superstructure is for a crane.

5. A crane comprising:

a rotating superstructure according to claim 1 ; and

a traveling undercarriage on which the rotating superstructure is rotatably mounted.

6. A crane according to claim 5 , wherein:

the first abutment section and the second abutment section are provided so that the first abutment surface and the second abutment surface are contacted to each other in face contact when lifting load is applied to the crane.

7. A crane according to claim 5 , wherein:

the front block and the rear block are pivotally joined to each other via a connection pin at lower sides of the front block and the rear block;

the first abutment section is provided at an upper side of the front block;

the second abutment section is provided at an upper side of the rear block; and

a rotation of the front block and the rear block around the connection pin is controlled by the first abutment surface and the second abutment surface contacting each other in face contact at upper sides of the front block and the rear block when lifting load is applied to the crane.

8. A crane according to claim 5 , further comprising:

a pin that is provided on either one of the front block and the rear block so as to join the front block and the rear block to each other; and

a pin fix member that is provided on the other one of the front block and the rear block, includes a guiding section so as to guide the pin to a fixed position when the front block and the rear block are joined to each other, and includes a lock section that locks the pin at the fixed position so as to prevent the front block and the rear block from being separated after the pin is guided to the fixed position, wherein:

the front block and the rear block are pivotally joined to each other via a connection pin at lower sides of the front block and the rear block,

the first abutment section is provided at an upper side of the front block,

the second abutment section is provided at an upper side of the rear block,

a rotation of the front block and the rear block around the connection pin is controlled by the first abutment surface and the second abutment surface contacting each other in face contact at upper sides of the front block and the rear block when lifting load is applied to the crane, and

a rotation of the front block and the rear block around the connection pin is controlled by the pin and the lock section of the pin fix member contacting each other when lifting load is not applied to the crane.

9. A rotating superstructure according to claim 1 , wherein:

the front block and the rear block are pivotally joined to each other via a connection pin; and

a rotation of the front block and the rear block around the connection pin is controlled by the first abutment surface and the second abutment surface contacting each other in face contact.

10. A method for transporting a rotating superstructure, comprising:

splitting a rotating superstructure according to claim 1 into the front block and the rear block;

transporting the front block and the rear block separately; and

rejoining the front block and the rear block into the rotating superstructure after transportation.

11. A method for transporting a rotating superstructure according to claim 10 , wherein

a mast for raising and lowering a boom is transported together with the rear block.

12. A rotating superstructure, comprising:

a front block on which is arranged a power unit that includes a prime mover; and

a rear block on which is arranged a unit for raising and lowering a boom that includes a winch and a sheave,

wherein:

the rotating superstructure is configured to be split into the front block and the rear block,

a first abutment section having a first abutment end face contact surface is provided at an end of the front block at a side facing the rear block,

a second abutment section having a second abutment end face contact surface is provided at an end of the rear block at a side facing the front block, and

when the front block and the rear block are joined together, the first abutment end face contact surface of the first abutment section and the second abutment end face contact surface of the second abutment section are aligned to permit end face-to-end face contact for receiving compressive force between the front and rear blocks.