JP2010195541A - Floating crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively incline a large jib of a floating crane when pulling in the jib into a hull by laying the jib on its side and to safely pull the inclined jib into the hull. <P>SOLUTION: The floating crane includes a rail 8 capable of moving the base 4 of the jib 3 in the vessel axial direction of the hull 2. The jib 3 is rotatably provided with an auxiliary jib on the tip end side of a main jib. The auxiliary jib is provided with a buoyancy tank 13 at a tip. When laying down, while inclining, the jib 3 erected at one end side of the hull 2, the auxiliary jib is bent with respect to the main jib without moving the base 4 from the one end side of the hull 2 and the buoyancy tank 13 is made to float on the ocean. In that condition, the base 4 is moved to the other end side of the hull 2 along the rail 8, and the jib 3 (the main jib and the auxiliary jib) and the buoyancy tank 13 are stored in the hull 2 together. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a floating crane.

  Conventionally, floating cranes are used for offshore crane work. The floating crane has a base fixed to the hull, a jib is pivotally mounted on the base, the rope is suspended from a pulley disposed on the jib, and the rope is attached by a separate winch. It is unloaded or unloaded by a hook that is wound or sent out and is suspended from the pulley.

  The jib is usually fixed to a base that supports the jib so that the jib can be swung in order to perform unloading or unloading work while standing on one end side (for example, the bow side) of the hull.

  However, when towing a floating crane or during a storm, it is desirable to lay down the standing jib.

  To that end, a rail is laid on the hull so that the base can be moved along the hull axis of the hull, and the jib is swung from the base and laid to accommodate the jib in the hull. Such a floating crane has already been proposed (see, for example, Patent Document 1).

  Normally, when the jib of a floating crane that is standing is to be laid down, if the jib arranged at one end (the bow side or the stern side) of the hull is tilted as it is, The larger the size, the greater the moment load applied to the base supporting the jib. In addition, when the jib is tilted to near the sea surface, it is difficult to pull it into the hull or to smoothly pull it in because the load on the base is increased. Further, when the lying jib is moved as it is, the hook suspended on the pulley disposed at the tip of the jib swings.

  Therefore, when the applicant lays the jib of the floating crane and pulls it into the hull, it can reliably fall down even with a large jib, and the jib that has fallen down can be safely pulled into the hull. The floating crane that has been applied has already been filed (for example, see Patent Document 2).

JP 7-179294 A JP 2005-330087 A

  In the thing of patent document 2 mentioned above, when lying down and pulling the jib of a floating crane into a ship's body, an auxiliary carrier receives the tip part of a jib, and it is made to draw in the state which the auxiliary carrier received. Therefore, even if it is a large jib, it is possible to reliably fall down, and even if the fallen jib can be safely pulled into the hull, an auxiliary trolley separate from the hull is required.

  The present invention can safely lay down a fallen jib while tilting even a large jib without fail, without using an auxiliary trolley as described above. It is an object of the present invention to provide a floating crane that can be pulled into the hull.

  In order to achieve the above object, the invention of claim 1 is a floating crane provided with a rail that makes the base of the jib movable in the axial direction of the hull, and the jib is auxiliary to the front end side of the main jib. A jib is rotatably provided, the auxiliary jib is provided with a buoyancy tank at the tip, and when the jib standing on one end side of the hull is tilted and tilted, the base is placed on one end side of the hull. The auxiliary jib is bent with respect to the jib without moving the buoyancy tank, and the buoyancy tank is floated on the sea. In this state, the base is moved along the rail to the other end of the hull, and the jib and auxiliary The jib and buoyancy tank are both housed in the hull.

  In this way, when the standing jib (jib and auxiliary jib) is tilted to the sea side, the buoyancy tank is floated on the sea. Since the buoyancy tank is drawn in a state of floating on the sea, the jib and the auxiliary jib can be drawn into the hull while being supported stably by the base and the buoyancy tank.

  According to a second aspect of the present invention, the buoyancy tank may be provided with a hook that is detachably locked to a locked portion provided at one end of the hull.

  In this way, when the jib is housed in the hull in a lying state, the hook of the buoyancy tank is releasably locked to the locked portion of the hull, so that the jib (main Jib, auxiliary jib) and buoyancy tank can be accommodated in the hull.

  According to a third aspect of the present invention, the buoyancy tank is provided with a main winding hook, and by pulling the main winding hook with a wire, the hook of the buoyancy tank can be engaged with and disengaged from the locked portion of the hull. It is desirable to be locked.

  In this way, the hook of the buoyancy tank can be locked to the locked portion of the hull using the main winding hook or wire originally provided in the jib, so it is necessary to provide an extra member. And the structure is not complicated.

  Preferably, the buoyancy tank has the same width as the tip of the auxiliary jib.

  In this way, since the buoyancy tank has the same width as the tip of the auxiliary jib, the buoyancy tank can be stably pulled in while floating above the sea.

  Since the present invention is configured as described above, even if it is a large jib, it can be laid down while being tilted safely and reliably, and can be drawn into the hull and stored without using an auxiliary trolley.

It is a side view showing a schematic structure of the whole floating crane which is one embodiment of the present invention. It is the same top view. It is a side view which shows the state which laid down the auxiliary jib horizontally with respect to the sea surface. (A)-(c) is explanatory drawing of the operation | movement which draws in the hull the jib (main jib, auxiliary jib) each lying down.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the floating crane 1 is a so-called crane that floats on the sea. A jib 5 having a main jib 3 and an auxiliary jib 4 is erected on one end side of the hull 2. The hooks 6 and 7 suspended on the (main jib 3 and auxiliary jib 4) are driven up and down to perform operations such as unloading and unloading at sea. In addition, the main jib 3 and the auxiliary jib 4 are rotatably connected, and as shown in FIG. 3, the auxiliary jib 4 is inclined with respect to the main jib 4 so as to form a certain angle so that the work can be performed. It has become.

  The lower end of the jib 5 (main jib 3) is rotatably supported by the base 8. That is, the lower ends of the left and right frames constituting the main jib 4 are installed on the two left and right bases 8, and the entire jib 5 is rotatably attached to the two bases 8. As a result, the entire jib 5 can move up and down with respect to the hull 2. This hoisting operation is performed by winding up or feeding out the backstay wire 9 suspended from the tip of the main jib 3 by the winch 10. The backstay wire 9 is wound around the winch 10 via the back tower 11.

  A buoyancy tank 13 having a width substantially the same as the width of the tip of the hollow auxiliary jib 4 is fixed to the tip of the jib 5 (auxiliary jib 4). Three pulleys 14, 15, 16 are provided in the vicinity of a connecting portion between the main jib 3 and the auxiliary jib 4, and a hook 6 is suspended from the pulley 14 via a wire 17. It is rolled up and fed out. A hook 7 is suspended from the pulleys 15 and 16 via a wire 19, and the wire 19 is wound or fed by a winch 20 on the main jib 3.

  The buoyancy tank 13 is provided with a hook 22 that is detachably locked to the locked portion 21 on the bow side of the hull 2, and the jib 5 is accommodated in the locked portion 21 when the jib 5 is accommodated in the hull 2. The hook 22 is detachably locked. Thereby, the buoyancy tank 13 is lifted from the sea and accommodated on the hull 2 together with the jib 5 (main jib 3 and auxiliary jib 4).

  On the deck of the hull 2, rails 23 are provided in parallel from the bow 2 </ b> A side to the stern 2 </ b> B side in parallel at predetermined intervals, and the two bases 8 are slidably engaged with each rail 23. The base 8 can be slid along the rail 23 between the bow 2A and the stern 2B. For the slide movement of the base 8, a drive wire provided with a drive unit is used, and the base 8 is moved by the drive wire. It may be configured to move, and the configuration for pulling in is not particularly limited.

  The jib 5 moves from one end side to the other end side of the hull 2 (for example, from the bow 2A to the stern 2B) as the two bases 8 move along the rails 23. At this time, driving means for moving both bases 8 and 8 at the same time may be used, or driving means for moving one of the bases 8 may be used so that the other base is driven. Thus, the entire jib 5 can be moved integrally.

  When the jib 5 is accommodated on the hull 2, the base 8 is positioned, for example, on the bow 2A side, and the standing jib 5 is gradually moved toward the sea as shown by the arrows in FIG. Tilt to a tilted state with a predetermined tilt angle. At this time, the auxiliary jib 4 is integrated with the main jib 3 through the wire 19.

  Then, since the wire 19 is wound up or fed out by the winch 20, the auxiliary jib 4 is rotated with respect to the main jib 3 so that the buoyancy tank 13 faces downward by driving the winch 20 and feeding out the wire 19. Finally, the buoyancy tank 13 can be floated on the sea as shown in FIG. At this time, it is also possible to hang the wire 24 on the hook 7 and wind it up with the winch 25 to assist the rotation of the auxiliary jib 4.

  That is, since the inclination angle of the auxiliary jib 4 with respect to the main jib 3 changes according to the length of the wire 19 that is fed, the angle of the buoyancy tank 13 with respect to the sea level also changes accordingly. The inclination angle of the auxiliary jib 4 with respect to the main jib 3 is adjusted so that the axis of the auxiliary jib 4 is perpendicular to the sea surface, and the buoyancy tank 13 is floated on the sea in this state.

  At this time, a buoyancy tank 13 is provided at the tip of the jib 5 (auxiliary jib 4), and when the jib 5 is tilted, the auxiliary jib 4 is rotated relative to the main jib 3 so that the buoyancy tank 13 floats on the sea. Therefore, it is not necessary to perform special alignment between the jib 5 (main jib 3 and auxiliary jib 4) and the auxiliary carriage as in the case of using the auxiliary carriage. At this time, it is necessary to tilt the jib 5 while winding up the slack of the wire 24 hung on the hook 7.

  Then, as shown in FIG. 3B, the drive wire is driven by a drive unit (not shown), the base 8 is moved along the rail 23, and the entire jib 5 is drawn into the hull 2. At this time, the jib 5 has a steel frame structure, and even if it is heavy, once the buoyancy tank 13 floats on the sea, a stable posture can be maintained. Therefore, in a state where the jib 5 rotatably supported by the base 8 is tilted and the buoyancy tank 13 is floated on the sea, the base 8 is pulled in the direction of drawing the jib 5 along the rail 23 toward the hull 2. Even if it is moved, the buoyancy tank 13 stably supports the jib 5 and moves to the hull 2 side together with the moving jib 5.

  When the jib 5 is tilted and pulled into the hull 2, the hull 2 is stabilized, so even if the waves such as storms are high, the influence can be suppressed to a minimum, and the floating crane 1 can be towed safely. Can do.

  When the base 8 and the jib 5 move integrally along the rail 23 laid in parallel from the bow 2A side to the stern 2B side of the hull 2, the left and right frames constituting the jib 5 are respectively The stern 2B is configured so as to straddle the steering chamber 31 provided on the deck of the hull 2, and has a layout that does not interfere with the steering chamber 31, and the base 8 and the jib 5 lying down substantially horizontally. It is possible to withdraw to the side.

  With the stern 2B fully retracted, as shown in FIG. 3C, the buoyancy tank 13 is lifted from the sea, and finally the hook 22 of the buoyancy tank 13 is locked on the bow side of the hull 2 It is detachably locked to 22 and accommodated so as to be integrated with the hull 2.

  The hook 7 on the auxiliary jib 4 side is connected to the hull 2 by the wire 24, and when the buoyancy tank 13 is moved to the hull 2 side, the wire 24 is loosened, so that the loosened wire 24 is wound up by the winch 25. It will be.

  Further, when the lying jib 5 is pulled into the hull 2, the backstay wire 9 suspended from the tip of the jib 5 is slackened, so that the wire 9 is wound up by the winch 10. The winding speed may be a speed at which loosening of the backstay wire 9 is eliminated. A member that detects loosening of the wire 9 may be used even if the winch 10 is operated while a person visually confirms this loosening. It is good also as a structure which installs separately and winds up automatically, when the said slack is detected.

  On the other hand, when the jib 5 accommodated in the hull 2 is erected at the operation position, the drive wire (not shown) is rotated in the reverse direction to drive the drive wire in the reverse direction so that the jib 5 is pushed out of the hull 2. The base 8 may be moved. That is, the drive wire of the drive unit can be driven forward and backward as is well known.

  In the embodiment described above, the buoyancy tank is hollow, but it may be a solid shape as long as it floats stably on the sea, and the shape is not particularly limited as long as the shape also floats stably on the sea.

1 Floating crane 2 Hull 2A Bow 2B Stern 3 Main jib 4 Auxiliary jib 5 Jib 8 Base 6, 7 Hook 13 Buoyancy tank

Claims (4)

A floating crane having rails that allow the base of the jib to move in the direction of the hull axis,
The jib is provided so that an auxiliary jib can rotate on the tip side of the main jib,
The auxiliary jib is provided with a buoyancy tank at the tip,
When tilting a jib standing on one end of the hull while tilting, the auxiliary jib is bent with respect to the jib without moving the base from one end of the hull, and the buoyancy tank is Floating crane characterized in that it floats on the sea, and in that state, the base is moved along the rail to the other end of the hull, and the jib, auxiliary jib and buoyancy tank are housed in the hull. .
2. The floating crane according to claim 1, wherein the buoyancy tank is provided with a hook that is detachably locked to a locked portion provided at one end of the hull.
The buoyancy tank is provided with a main winding hook,
The floating crane according to claim 2, wherein the hook of the buoyancy tank is detachably locked to the locked portion of the hull by pulling the main winding hook with a wire.
  The floating crane according to any one of claims 1 to 3, wherein the buoyancy tank has the same width as a width of a tip portion of the auxiliary jib.

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