Rigging devices, floating objects and lifting methods for offshore construction

Abstract

To provide a slinging device, a floating body, and a lifting method capable of improving workability of slinging works.SOLUTION: A slinging device 1 comprises: a box-shaped part 10 which is attached to a lifted object S, opens upward, has an insertion port 11 through which a hanging tool Wh with an annulus provided at a tip of a restiform body W can be inserted, and has an introducing port 21 which is larger than the insertion port 11 and is connected to the insertion port 11, and can surround the hanging tool Wh from a horizontal direction; and a pin 30 which can be inserted into the annulus and can lock the hanging tool Wh. The box-shaped part 10 has: a pin hole 12 which penetrates in an almost horizontal direction and through which the pin 30 can be inserted; and a pedestal 50 which dents vertically downward below a hole axis 13 of the pin hole 12.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a slinging device, a floating object, and a hoisting method for offshore construction. [Background technology]

[0002] In the past, in marine construction work, a structure to be hoisted has been hoisted from a work boat. In such work, slinging work is required to attach the hoisting gear of the work boat to the structure.

[0003] However, when at sea, the structure and the hoisting gear are caused to sway by the action of waves and wind, making the positional relationship between the structure and the hoisting gear unstable, so there was room for improvement in the ease of rigging work to attach the hoisting gear supported by a work boat to the structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-265182 A Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the problems in the background art described above, an object of the present invention is to provide a slinging device, a floating object, and a hoisting method that can improve the workability of slinging work. [Means for solving the problem]

[0006] The gist of the present invention is as follows.

[0007] (1) A slinging device according to one embodiment of the present invention is attached to an object to be suspended, has an insertion opening that opens upward and allows the insertion of a suspension device having a ring-shaped portion at the end of a rope-like body, has an inlet at the top that is larger than the insertion opening and is connected to the insertion opening, and comprises a box-shaped portion capable of surrounding the suspension device from a horizontal direction, and a pin that can be inserted into the ring-shaped portion and can engage the suspension device, the box-shaped portion having a pinhole that penetrates approximately horizontally and allows the pin to be inserted, and a base that is recessed vertically downward below the axis of the pinhole. (2) In the above item (1), the box-shaped portion may include a guide portion having a tapered surface that continues from the introduction port to the insertion port. (3) In the above (1) or (2), the pin may be supported so as to be freely movable along the hole axis. (4) In any one of the above (1) to (3), the base may have an inclined surface that is inclined with respect to a vertical plane including the hole axis. (5) In the above item (4), the inclined surface may include a first inclined surface and a second inclined surface that are disposed symmetrically with respect to the vertical plane. (6) In the above item (5), the base may be disposed in a position that allows the pin to pass through the annular portion with the annular portion placed thereon. (7) In any of the above (1) to (6), the sling may be protected by a thimble. (8) A floating body according to one embodiment of the present invention may be a floating body having any one of the slinging devices described above in (1) to (7) attached thereto. (9) In the above (8), the floating object may be a stinger. (10) A method according to one aspect of the present invention may be a method of attaching the hoisting tool to the slinging device of any one of (1) to (9) above, and hoisting the hoisting tool at sea. Effect of the Invention

[0008] According to the present invention, it is possible to provide a slinging device, a floating object, and a hoisting method that can improve the workability of slinging work. [Brief description of the drawings]

[0009] [Figure 1] FIG. 13 is an explanatory diagram of a state in which an object to be hung is hung from a support body. [Diagram 2] FIG. 13 is an explanatory diagram for guiding a hoisting tool to a slinging device. [Diagram 3] FIG. 2 is an explanatory diagram showing a slinging device with a hoisting tool attached, viewed from the side. [Figure 4] FIG. 2 is an explanatory diagram showing a slinging device with a hoisting tool attached, viewed from above. [Diagram 5] FIG. [Figure 6] 6 is a cross-sectional view taken along the line A in FIG. 5. [Figure 7] 6 is a cross-sectional view taken along the line B in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Embodiment) FIG. 1 is an explanatory diagram of a state in which an object to be hoisted S is hoisted from a support F. FIG. 2 is an explanatory diagram when a hoisting tool Wh is guided to the slinging device 1. FIG. 3 is an explanatory diagram of the slinging device 1 with the hoisting tool Wh attached, viewed from the side. FIG. 4 is an explanatory diagram of the slinging device 1 with the hoisting tool Wh attached, viewed from above. FIG. 5 is a plan view of the slinging device 1. FIG. 6 is a cross-sectional view taken along the line A in FIG. 5. FIG. 7 is a cross-sectional view taken along the line B in FIG. 5.

[0011] As shown in Figure 1, the slinging device 1 of this embodiment can be used, for example, in offshore construction work, when hoisting an unstable object S to be hung, such as a structure such as a stinger, with a hoisting gear Wh from a crane (not shown) supported by an unstable support body F such as a work vessel. The suspended object S may be a floating object such as a stinger to which the slinging device 1 is attached. A stinger is a rigid frame with buoyancy that supports a pipe passing through it in order to safely deflect the pipe as it is unwound from a ship to the seabed. The structure, dimensions, and other standards of the stinger are selected according to the water depth, pipe size, and other factors, and the length ranges from about 25 m to 120 m. Stingers are generally stored or relocated with their length horizontal, and supported on the seabed with their length vertical. A stinger is a structure that is subjected to a buoyancy greater than the force of gravity acting on it in the sea.

[0012] The hoisting tool Wh is a part that is connected to the slinging device 1. The hoisting tool Wh has a ring-shaped part such as a steel hook or eye (see Figs. 2, 7, etc.) that is provided at the tip of a cord-like body W such as a steel wire rope. This makes it easier to lock the hoisting tool Wh onto the pin 30 of the slinging device 1.

[0013] The sling Wh may be protected by a thimble. Specifically, the thimble is attached to the sling Wh along the inside of the annular portion of the sling Wh so that the annular portion and the pin 30 do not come into direct contact with each other. The thimble has a predetermined rigidity so that the shape of the annular portion of the sling Wh can be maintained when the cord-like body W is pulled with the pin 30 passing through the sling Wh. In addition, the thimble has a hardness (strength) that is appropriately lower than the hardness (strength) of the annular portion or the pin 30. In this way, the thimble is interposed between the annular portion of the sling Wh and the pin 30, and therefore damage to the sling Wh or the pin 30 can be suppressed.

[0014] The slinging device 1 has a desired rigidity and strength so as not to be damaged by the load acting between the suspended object S and the sling Wh during the slinging operation. The slinging device 1 is made of, for example, steel. The slinging device 1 is attached to the suspended object S by an appropriate fixing means such as welding or bolts. Multiple slinging devices 1 may be attached to one suspended object S.

[0015] 2 to 7, the slinging device 1 has a box-shaped portion 10 having an insertion opening 11 through which a hoisting tool Wh having a ring-shaped portion provided at the end of a rope-like body W can be inserted. The slinging device 1 also has an introduction opening 21 at an upper portion which is larger than the insertion opening 11 and which communicates with the insertion opening 11. The slinging device 1 further has a pin 30 capable of locking the hoisting tool Wh.

[0016] (box-shaped part) The box-shaped portion 10 has an insertion opening 11 that opens upward and allows the insertion of a suspending tool Wh provided at the end of the cord-like body W. The lower portion of the box-shaped portion 10 is fixed to the object S to be suspended by appropriate means such as welding or bolts. The box-shaped portion 10 has an inner surface with an inner dimension that allows the suspending tool Wh to be surrounded from the horizontal direction.

[0017] 5, the box-shaped portion 10 is formed of, for example, a first side plate 11A and a second side plate 11B that face each other in the axial direction of the suspender Wh (the moving axis of the pin 30 or the hole axis 13 direction of the pin hole 12), and a third side plate 11C and a fourth side plate 11D that connect the first side plate 11A and the second side plate 11B and face each other in a direction perpendicular to the axial direction of the suspender Wh. The first side plate 11A and the second side plate 11B can restrict the axial movement of the suspender Wh housed in the box-shaped portion 10 in a plan view. The third side plate 11C and the fourth side plate 11D can restrict the movement of the suspender Wh housed in the box-shaped portion 10 in a direction perpendicular to the axis in a plan view.

[0018] When viewed in a plane, the insertion opening 11 has a shape (e.g., a rectangular shape) with inner dimensions that have a slight clearance according to the outer dimensions of the suspender Wh projected onto a plane, so that the suspender Wh can be lowered from above and stored therein.

[0019] The box-shaped portion 10 has a pin hole 12 penetrating in a substantially horizontal direction and through which the pin 30 can be freely inserted. The box-shaped portion 10 also has a base 50 recessed vertically downward below the hole axis 13 of the pin hole 12. In this way, the slinging device 1 has the box-shaped portion 10 with the base 50 recessed vertically downward below the hole axis 13 of the pin hole 12, so that the slinging tool Wh can be held in a posture and position inside the box-shaped portion 10 so that the pin 30 can be inserted therethrough simply by lowering (dropping) the slinging tool Wh through the insertion opening 11 of the box-shaped portion 10. Therefore, since there is no need to adjust the postures of the slinging tool Wh and the pin 30 to connect them, the worker does not need to directly touch the contact area between the slinging tool Wh and the pin 30. Therefore, even in a situation where the posture and positional relationship between the slinging tool Wh and the object to be sling S is unstable due to the action of waves and wind, such as in offshore construction, slinging work can be performed safely and easily. Therefore, the workability of rigging work can be improved.

[0020] Furthermore, the base 50 may be disposed at a position where the pin 30 can penetrate the annular portion of the suspending tool Wh when the suspending tool Wh is placed thereon. This allows the suspending tool Wh to be in a position where the pin 30 can penetrate the suspending tool Wh simply by placing the suspending tool Wh on the base 50. The base 50 may have an inclined surface 51 that is inclined with respect to the vertical plane 14 (see FIG. 7) including the hole axis 13. This allows the suspending tool Wh to slide along the inclined surface 51. Since the base 50 has the inclined surface 51, the suspending tool Wh can be moved to a posture and position inside the box-shaped portion 10 where the pin 30 can be easily inserted, by the action of gravity alone. Note that the inclined surface 51 is inclined with respect to the horizontal direction, and is preferably inclined by an angle of friction or more that corresponds to the static friction coefficient between the suspending tool Wh and the inclined surface 51.

[0021] The inclined surface 51 may have a first inclined surface 51A and a second inclined surface 51B that are arranged symmetrically with respect to the vertical surface 14. In this way, since the inclined surface 51 has the first inclined surface 51A and the second inclined surface 51B, the hanging tool Wh can be moved by gravity alone inside the box-shaped portion 10 to a posture and position where the pin 30 can be easily inserted, and can be placed on the base 50, and can be stopped in that posture and position.

[0022] Specifically, when the suspender Wh is inserted into the inside of the box-shaped portion 10 through the insertion opening 11, the suspender Wh is restricted from moving in the horizontal direction by the inner surface of the box-shaped portion 10. Then, when the suspender Wh is lowered downward, it first comes into contact with one of the first and second inclined surfaces 51A and 51B. When the suspender Wh is further lowered downward, it moves obliquely downward along the one inclined surface 51 while remaining in contact with the one inclined surface 51 until it comes into contact with the other of the first and second inclined surfaces 51A and 51B. At this time, the suspender Wh is supported at two points, the first and second inclined surfaces 51A and 51B, and thus its downward movement is restricted. Then, the suspender Wh is placed on the inclined surface 51 with its horizontal movement restricted by the inner surface of the box-shaped portion 10. Therefore, by simply inserting the suspender Wh into the inside of the box-shaped portion 10 through the insertion opening 11 and lowering it, the suspender Wh can be easily maintained inside the box-shaped portion 10 in a position that makes it easy to insert the pin 30 therethrough.

[0023] The distance d from the hole axis 13 to the inclined surface 51 is a dimension equal to or greater than the outer radius R of the annular portion. The distance d from the pin 30 to the inclined surface 51 is a dimension that allows the pin 30 to be inserted into the annular portion when the annular portion of the sling Wh is placed on the base 50. When the annular portion is annular, the distance (e.g., 10 cm) from the pin 30 to the inclined surface 51 of the base 50 is a dimension obtained by subtracting the inner radius (e.g., 22 cm) from the outer radius (e.g., 30 cm) of the annular portion of the sling Wh (e.g., 8 cm) plus a gap (e.g., 2 cm). This allows the center of the annular portion of the sling Wh to approach the axis of movement of the pin 30 (the extension of the axis of the pin 30) simply by storing the sling Wh in the box-shaped portion 10 and placing it on the base 50 and letting it move naturally under the influence of gravity. This allows the sling Wh to be in a posture and position that allows the pin 30 to be inserted into the inside of the annular portion of the sling Wh.

[0024] (Guide section) The box-shaped portion is provided with a guide portion 20 having a tapered surface 20a continuing from an introduction port 21 to the insertion port 11. The guide portion 20 is connected to the insertion port 11 and has an introduction port 21 at its upper portion which is larger than the insertion port 11. Specifically, the guide portion 20 has an opening at its lower portion which is the same size as the insertion port 11 of the box-shaped portion 10, and has an introduction port 21 at its upper portion which is larger than the insertion port 11. That is, the outer shape of the introduction port 21 is large enough to completely surround the outer shape of the insertion port 11 in a plan view. The shape of the introduction port 21 may be the same as or similar to the shape of the insertion port 11 in a plan view (for example, both are rectangular or both are elliptical). The guide portion 20 has an inner surface that forms a cavity that narrows from top to bottom. The inner surface of the guide portion 20 forms the cavity in, for example, a frustum shape. That is, the inner surface of the guide portion 20 is inclined from the introduction port 21 toward the insertion port 11.

[0025] The inner surface of the guide portion 20 may be composed of a plurality of flat tapered surfaces 20a according to the shape of the insertion opening 11. For example, as shown in FIG. 5, when the shape of the insertion opening 11 is rectangular, the shape of the introduction opening 21 may be a similar rectangle larger than the shape of the insertion opening 11, and the inner surface may be composed of four flat tapered surfaces 20a according to the number of sides constituting the shape of the insertion opening 11. The tapered surfaces 20a are inclined with respect to the vertical direction. In this way, since the inner cavity of the guide portion 20 expands from the bottom to the top, even if the suspender Wh is unstable in posture and position, it can be reliably guided to the insertion opening 11, which has only a small gap with respect to the outline of the suspender Wh projected vertically, by simply inserting it into the relatively large introduction opening 21 and lowering it.

[0026] (pin) The pin 30 is, for example, a cylindrical rod having the same cross-sectional shape along the axial direction, and is made of, for example, steel. The pin 30 is adapted to be freely inserted into an annular portion of a suspender Wh, such as an eye splice. That is, the pin 30 has an outer dimension (e.g., outer diameter) smaller than an inner dimension (e.g., inner diameter) of the annular portion of the suspender Wh.

[0027] The pin 30 is supported so as to be movable along the hole axis 13 of the pin hole 12. Specifically, as shown in Figs. 5 and 6, the pin 30 is supported so as to be movable between a penetration position P1 where the pin 30 penetrates the pin hole 12 of the box-shaped portion 10 so as to be able to lock the hoisting tool Wh, and a retracted position P2 where the pin 30 is retracted from the pin hole 12 of the box-shaped portion 10 so as to be able to store or remove the hoisting tool Wh. This allows the hoisting tool Wh stored in the box-shaped portion 10 to be locked or unlocked simply by pushing or pulling the pin 30. The pin 30 may be supported by a bracket B fixed to the object S to be hoisted, or may be supported by, for example, the box-shaped portion 10 of the slinging device 1.

[0028] The pin 30 engages the hoist Wh and is simply supported by the first side plate 11A and the second side plate 11B in a state in which the pin 30 penetrates the pin hole 12 of the box-shaped portion 10. This allows the hoisting load acting on the hoist Wh to be transmitted to the object S to be hung via the pin 30 and the box-shaped portion 10.

[0029] (action) Next, the operation of the slinging device 1 according to this embodiment will be described along with the situation of a work situation in which a stinger, which is an object to be hung S, is hoisted by a rope-like body W having a hoisting tool Wh attached to its tip from a work boat, which is a support body F, in an offshore construction project. Also, a method of attaching the hoisting tool Wh to the above-mentioned slinging device 1 and hoisting the hoisting tool Wh at sea will be described.

[0030] (1) As shown in Fig. 1, a plurality of (four in this example) slinging devices 1 are attached in advance to suitable locations on the object to be hung S where the object to be hung and the sling Wh of the rope-like body W are to be connected. Here, the introduction port 21 of the guide part 20 of the slinging device 1 opens upward to guide the sling Wh. (2) The pin 30 of the slinging device 1 is retracted to the retracted position P2. (3) The hoisting tool Wh is lowered and inserted into the inlet 21 of the guide part 20. (4) Next, when the suspending tool Wh is lowered as it is, the suspending tool Wh passes through the insertion hole and reaches the inner cavity of the box-shaped part 10. When the suspending tool Wh is further lowered, the suspending tool Wh comes into contact with the base 50. When the suspending tool Wh is further lowered from there, the suspending tool Wh slides obliquely downward along the inclined surface 51 of the base 50 and fits into the recess of the base while being accommodated in the inner cavity of the box-shaped part 10. Here, the horizontal movement of the suspending tool Wh is restricted by the inner surface of the box-shaped part 10, and the downward movement is restricted by the inclined surface 51 of the base 50, so that the position of the suspending tool Wh is determined based on the box-shaped part 10. Note that the positional relationship between the box-shaped part 10 and the moving range of the pin 30 is already determined, so that when the position of the suspending tool Wh based on the box-shaped part 10 is determined, the moving range of the pin 30 and the positional relationship between the suspending tool Wh are determined. (5) With the suspender Wh housed in the inner cavity of the box-shaped portion 10 and placed on the base 50, the pin 30 is moved from the retracted position P2 to the penetrating position P1. That is, the pin 30 is caused to penetrate the box-shaped portion 10. Then, the pin 30 penetrates the annular portion of the suspender Wh, and the pin 30 and the annular portion of the suspender Wh are engaged with each other. As a result, the pin 30 is simply supported by the first side plate 11A and the second side plate 11B of the box-shaped portion 10 while penetrating the annular portion of the suspender Wh. (6) A tensile load is applied to the rope W using the work boat's crane to lift the stinger. In this way, the hoisting tool Wh and the slinging device 1 can be easily and safely connected, and the stinger can be hoisted. (7) After the stinger has been hoisted and installed in the desired position, when removing the hoisting tool Wh from the slinging device 1, first ensure that no tensile load is acting on the rope-like body W. (8) Then, the pin 30 is retracted from the penetration position P1 to the retracted position P2, whereby the engagement between the pin 30 and the hoisting tool Wh is released. (9) The hoist Wh is raised and removed from the box-shaped portion 10. In this manner, the hoisting tool Wh can be easily removed from the slinging device 1.

[0031] (Other embodiments) Although one embodiment has been described in detail above with reference to the drawings, the specific configuration is not limited to the above, and various design modifications and the like are possible.

[0032] The slinging device 1 of this embodiment is attached to the object S to be hoisted, has an insertion opening 11 through which a hoisting tool Wh having a ring-shaped portion provided at the tip of a rope-like body W can be inserted, has an inlet 21 at the top that is larger than the inlet 11 and is connected to the insertion opening 11, and is equipped with a box-shaped portion 10 that can surround the hoisting tool Wh from the horizontal direction. The slinging device 1 is equipped with a pin 30 that can be freely inserted into the ring-shaped portion and can lock the hoisting tool Wh. The box-shaped portion 10 has a pin hole 12 that penetrates the box-shaped portion 10 in a substantially horizontal direction and through which the pin 30 can be freely inserted, and a base 50 that is recessed vertically downward below the hole axis 13 of the pin hole 12. As a result, the hoisting tool Wh and the slinging device 1 can be connected simply by dropping the hoisting tool Wh into the inlet 21 of the guide portion 20 and moving the pin 30, so that the slinging work can be easily performed. Therefore, a slinging device that can improve the workability of the slinging work can be provided.

[0033] The floating object of this embodiment is fitted with the above-mentioned slinging device 1. This allows slinging work to be easily performed even on a swaying floating object.

[0034] The floating object in this embodiment is a stinger. This allows for easy slinging even in the case of a floating object that moves, and facilitates the construction of the stinger at sea.

[0035] In the method of this embodiment, a hoisting tool Wh is attached to the above-mentioned slinging device 1, and the slinging tool Wh is hoisted on the sea. This makes it possible to easily perform slinging work on the sea. [Explanation of symbols]

[0036] 1 Slinging device 10 Box-shaped part 11 Insertion port 11A 1st side plate 11B 2nd side plate 11C 3rd side plate 11D 4th side plate 12 Pin hole 13 hole axis 14 Vertical Plane 20 Guide section 20a Tapered surface 21 Introduction 30 pin 50 Pedestal 51 Slope 51A 1st slope 51B 2nd slope B Bracket d Distance F Support P1 penetration position P2 Evacuation position R outer radius S Hanging object W Cord Wh Hanging equipment

Claims

1. a box-shaped portion that is attached to the object to be hung, has an insertion opening that opens upward and allows a hanging tool having a ring-shaped portion at the end of a rope-like body to be inserted therethrough, has an introduction opening at an upper portion that is larger than the insertion opening and is connected to the insertion opening, and is capable of surrounding the hanging tool from a horizontal direction; a pin that can be freely inserted into the annular portion and can lock the suspender, The box-shaped portion is a pin hole penetrating substantially horizontally and through which the pin can be freely inserted; A seat is provided below the hole axis of the pin hole, The base is disposed at a position where the pin can penetrate the annular portion with the annular portion placed thereon. A slinging device characterized by the above.

2. The box-shaped portion includes a guide portion having a tapered surface extending from the introduction port to the insertion port.

2. The slinging device according to claim 1.

3. The pin is supported so as to be movable along the hole axis.

3. The slinging device according to claim 1 or 2.

4. The base has an inclined surface that is inclined with respect to a vertical plane including the hole axis. A slinging device according to any one of claims 1 to 3.

5. The inclined surface includes a first inclined surface and a second inclined surface that are arranged symmetrically with respect to the vertical plane.

5. The slinging device according to claim 4.

6. The pin is capable of locking the sling secured by a thimble. A slinging device according to any one of claims 1 to 5.

7. A floating object having the slinging device according to any one of claims 1 to 6 attached thereto.

8. The floating object is a stinger.

8. The floating structure according to claim 7 .

9. A method for attaching the sling to the sling device according to any one of claims 1 to 6 and hoisting the sling at sea.

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