JP2013039867A - Holding device for moving caisson and caisson moving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding device for moving a caisson and a caisson moving method safely moving a submerged caisson filled with filling sand therein to a target position while minimizing a lifting force.SOLUTION: The holding device 1 is lifted via lifting wires 10a-10d of cranes 11a, 11b mounted to a workboat 12. After widening a space between a pair of right and left grips 3, 2, the holding device 1 is lowered, a caisson 13 is positioned between the grips 3, 2, and the space between the grips 3, 2 is narrowed to hold the caisson 13 between them. Then, an amount of ballast water W of a ballast water chamber is adjusted to generate buoyancy in the holding device 1, the holding device 1 is lifted via the lifting wires 10a-10d to raise the caisson 13 from the bottom of water, and the workboat 12 is moved to move the caisson to the target position in a floating state in the water.

Description

  The present invention relates to a caisson moving holding device and a caisson moving method. More specifically, the present invention relates to a caisson moving method, and more specifically, a caisson that is filled with filling sand and is underwater can be safely lifted to a target position with minimal lifting force. The present invention relates to a caisson moving holding device that can be moved and a caisson moving method.

  Once the caisson is installed, it is difficult to move the caisson because it is filled with filling sand and is too heavy. Therefore, a structure has been proposed in which a box is engaged with the wall surface of the caisson, and buoyancy is generated by discharging water from the box, and the caisson is lifted from the bottom of the water by this buoyancy (patent). Reference 1).

  In the structure described in Patent Document 1, the caisson is lifted only by the buoyancy generated in the box. In this case, if the generated buoyancy is not controlled in detail, the caisson may unexpectedly rise, so it is difficult to stably raise the caisson. And in this structure, since the independent box is engaged with the two wall surfaces which a caisson opposes, these engagement operations also become complicated. This structure is intended to move the caisson installed at a regular position, and assumes that there is an engaging portion on the wall surface of the caisson. However, it is difficult to dispose the engaging portion on the wall surface of the caisson that is washed away by the tsunami and deviated from the normal position and is underwater. Therefore, in this structure, the misaligned caisson cannot be safely moved to the target position.

Utility Model Registration No. 3039842

  An object of the present invention is to provide a caisson moving holding device that can safely move a caisson that is filled with filled sand and is underwater with a minimum lifting force to a target position, and the movement of the caisson. It is to provide a method.

  In order to achieve the above object, the caisson moving holding device of the present invention includes a pair of left and right grips variably connected to each other, a ballast water chamber provided in the pair of left and right grips, and the ballast water. And a ballast water adjusting means for adjusting the amount of water in the chamber, and when the space between the pair of left and right grips is narrowed up and down via a suspension wire of a crane mounted on a work ship, It is characterized by having a configuration in which a caisson in the water is sandwiched and held.

  Further, in the caisson moving method of the present invention, the holding device is suspended through a suspension wire of a crane mounted on a work ship so that the distance between the pair of left and right grips is widened. The holding device is lowered so that the caisson that is filled with filling sand and is in the water is positioned between the pair of left and right grips in the expanded state. The holding device is held by narrowing the gap between the gripping portions and then holding the caisson, and then the buoyancy is generated in the holding device by adjusting the amount of water in the respective ballast water chambers. The caisson is lifted from the bottom of the water, and the work ship is moved to move the caisson to a target position in a state of floating in the water.

  According to the present invention, the caisson moving holding device is hung through the hanging wire of the crane mounted on the work boat, and is lowered in a state where the distance between the pair of left and right grips is widened. Between the pair of left and right grips, the inside caisson is filled with filled sand and the underwater caisson is located, and then the gap between the pair of left and right grips is narrowed and the caisson is sandwiched By holding, even a caisson that is not in a normal posture can be held.

  Thereafter, the amount of water in each of the ballast water chambers is adjusted so that buoyancy is generated in the holding device, and the holding device is raised through the suspension wire to raise the caisson from the bottom of the water. That is, since the caisson is levitated using the suspension wire while using the buoyancy as an auxiliary force, the caisson can be levitated safely as compared with the case where the caisson is levitated only by buoyancy. And while using the auxiliary force of this buoyancy, the caisson is moved to the target position while floating in water, the lifting force can be minimized.

It is a side view which illustrates the holding | maintenance apparatus for caisson movement of this invention. It is a front view of the holding | maintenance apparatus of FIG. It is a top view of the holding | maintenance apparatus of FIG. It is explanatory drawing which illustrates the process of lowering a holding | maintenance apparatus by a side view. It is explanatory drawing which illustrates the process hold | maintained on both sides of a caisson with a holding | maintenance apparatus by a side view. It is explanatory drawing which illustrates the process of adjusting the water quantity of the ballast water chamber of a holding | maintenance apparatus by a side view. It is explanatory drawing which illustrates the process of adjusting the water quantity of the ballast water chamber of a holding device by a front view. It is explanatory drawing which illustrates in a side view the process of making a caisson float and move from a water bottom.

  Hereinafter, the caisson moving holding device of the present invention will be described based on the embodiments shown in the drawings.

  As illustrated in FIGS. 1 to 3, the caisson moving holding device 1 (hereinafter referred to as the holding device 1) of the present invention has a pair of left and right grip portions 2 and 3 connected by a connecting portion 6. It is in the shape of a letter. One gripping portion 2 is fixed to the connecting portion 6, and the other gripping portion 3 is connected to the connecting portion 6 via a rotary connecting mechanism 7. The other gripping portion 3 is coupled to be rotatable about a rotation coupling mechanism 7 by driving means such as a hydraulic cylinder.

  As a result, the pair of left and right grips 2 and 3 have a structure in which the distance between them is variably connected via the connecting part 6. When the interval between the pair of left and right grips 2 and 3 is narrowed, the inside is filled with sand and the caisson 13 underwater is sandwiched and held. In the present invention, the caisson 13 in water refers to a caisson 13 that is partially or entirely submerged.

  One holding part 2 is provided with two ballast water chambers 2a and 2b side by side in the front-rear direction. The other grip 3 is provided with two ballast water chambers 3a and 3b arranged in the front-rear direction. A pump 4 is provided in each ballast water chamber 2a, 2b, 3a, 3b. Each ballast water chamber 2a, 2b, 3a, 3b is provided with an opening / closing port 8 at the lower end and a drain port 9 at the upper end. Drain lines 2 c, 2 d, 3 c, 3 d extending to the outside through the drain port 9 are connected to each pump 4. These pumps 4 and their discharge lines 2c, 2d, 3c, 3d constitute ballast water adjusting means for adjusting the amount of water in the respective ballast water chambers 2a, 2b, 3a, 3b.

  In this embodiment, hydraulic jacks 5a and 5b are provided on the inner side surfaces of the pair of left and right grips 2 and 3 in the left and right direction. The rods of the respective hydraulic jacks 5a and 5b move forward and backward in the left-right direction. As long as the wall surface of the caisson 13 sandwiched between the pair of left and right grips 2 and 3 can be sufficiently pressed, not only the hydraulic jacks 5a and 5b but also pressing means similar to this can be employed.

  Further, a positioning portion 6 a that protrudes downward is provided on one gripping portion 2 side of the lower end surface of the connecting portion 6. A hydraulic jack 5 c is provided on the other gripping portion 3 side of the lower end surface of the connecting portion 6. The rod of the hydraulic jack 5c moves forward and backward.

  As illustrated in FIG. 4, the holding device 1 is lifted and lowered via the suspension wires 10 a, 10 b, 10 c, and 10 d of the cranes 11 a and 11 b mounted on the work boat 12.

  Next, a method for moving the caisson 13 that has been swept away from the normal installation position by a tsunami or the like to the target position using the holding device 1 will be described.

  First, as illustrated in FIG. 4, the holding device 1 is suspended through the suspension wires 10 a, 10 b, 10 c, and 10 d of the cranes 11 a and 11 b mounted on the work boat 12, and the pair of left and right grips 2 and 3 are connected to each other. Increase the interval of. The respective hydraulic jacks 5a, 5b, 5c are set in a retracted state.

  Since the washed caisson 13 does not exist at the regular installation position, it is often on an inclined bottom of the water. Here, the lengths of the respective suspension wires 10 a, 10 b, 10 c, and 10 d are adjusted, and the holding device 1 is lowered so as to match the inclination of the caisson 13. Then, the caisson 13 in the water is positioned between the pair of left and right grips 2 and 3 in the expanded state.

  Next, as illustrated in FIG. 5, the positioning unit 6 a is brought into contact with the upper surface of the caisson 13 to position the holding device 1. As appropriate, the hydraulic jack 5c is advanced and brought into contact with the upper surface of the caisson 13, the position of the holding device 1 is adjusted, and the lengths of the suspension wires 10a, 10b, 10c, and 10d are adjusted as appropriate. The connecting part 6) is made to coincide with the inclination of the caisson 13. When the holding device 1 is lowered into the water, each opening / closing port 8 is opened.

  After positioning the holding device 1, the other gripping part 3 is rotated around the rotation coupling mechanism 7 to narrow the distance between the pair of left and right gripping parts 2, 3 and sandwich the caisson. Here, the caissons 13 are held by the holding device 1 by advancing the respective hydraulic jacks 5 a and 5 b and pressing the hydraulic jacks 5 a and 5 b against the wall surface of the caisson 13.

  When the pair of left and right holding parts 2 and 3 are lowered into the water, seawater flows into the respective ballast water chambers 2a, 2b, 3a and 3b through the opening / closing port 8. The inflowing seawater becomes ballast water W. After an appropriate amount of ballast water W flows into the respective ballast water chambers 2a, 2b, 3a, 3b, the opening / closing port 8 is closed.

  Next, as illustrated in FIGS. 6 and 7, the pump 4 is operated to discharge the ballast water W to the outside through the drain lines 2c, 2d, 3c, and 3d. By adjusting the amount of ballast water W in each of the ballast water chambers 2a, 2b, 3a, 3b, buoyancy is generated in the holding device 1 within a range in which the caisson 13 held by the holding device 1 does not float from the bottom of the water. Let it be in the state you let it. The maximum buoyancy may be generated in the holding device 1 within a range in which the caisson 13 does not rise from the bottom of the water.

  Adjusting the amount of ballast water W in each of the ballast water chambers 2a, 2b, 3a, 3b so as to maintain the inclination of the inclined caisson 13 as it is, thereby generating buoyancy in the holding device 1 Is preferred.

  Next, as illustrated in FIG. 8, the holding device 1 holding the caisson 13 is raised via the suspension wire wires 10 a, 10 b, 10 c, and 10 d to cause the caisson 13 to float from the bottom of the water. For example, the caisson 13 is moved to the target position in a state where the caisson 13 is levitated in the water by moving the work ship 12 while holding the position levitated about 50 cm to 100 cm from the bottom of the water.

  When the caisson 13 is levitated from the bottom of the water as in this embodiment, the caisson 13 will inadvertently interfere with the ground at the bottom of the water if the caisson 13 is levitated vertically upwards while still in the water (in a tilted position). This is preferable because problems such as these are less likely to occur.

  The caisson 13 that has been levitated in water is positioned so that the upper surface becomes horizontal while moving to the target position or by adjusting the length of the suspension wire wires 10a, 10b, 10c, and 10d at the target position. Is fixed and installed at a predetermined position.

  As described above, in the present invention, the holding device 1 is interposed via the suspension wires 10 a, 10 b, 10 c, and 10 d so that the caisson 13 in the water is positioned between the pair of left and right grips 2 and 3 in the expanded state. Next, the gap between the pair of left and right grips 2 and 3 is narrowed and held between the caissons 13. Therefore, even the caisson 13 that is not in a normal posture can be held.

  Thereafter, the suspension wires 10a, 10b, 10c, and 10d are used while using the buoyancy generated in the holding device 1 as an auxiliary force by adjusting the amount of the ballast water W in each of the ballast water chambers 2a, 2b, 3a, and 3b. Since the caisson 13 is levitated using, the caisson 13 can be levitated safely as compared with the case where the caisson 13 is levitated only by buoyancy. And while using the auxiliary force of this buoyancy, the caisson 13 is moved to the target position in a state of being levitated in water, so that the force lifted by the cranes 11a and 11b can be minimized. In addition, the caisson 13 may be lifted and lifted after the inside sand inside the caisson 13 is slightly discharged to the outside.

  In this embodiment, the holding device 1 is suspended at four points using the two cranes 11a and 11b, but is not limited to this. For example, two cranes can be hung using one crane 11a.

  In addition, two ballast water chambers 2 a, 2 b, 3 a, 3 b are provided in each of the left and right grip portions 2, 3, but one ballast water chamber 2 a, one for each grip portion 2, 3, It is also possible to use a specification provided with 3a.

  The caisson 13 is not limited to the shape exemplified in the embodiment, but may have other shapes (for example, a square, a rectangle, etc.). Therefore, it is preferable that the holding device 1 (the gripping portions 2 and 3 and the connecting portion 6) has a shape that can easily hold and hold the caisson 1 to be moved.

  The structure that variably connects the pair of left and right grips 2 and 3 is not limited to the structure illustrated in the embodiment, and other structures may be employed. For example, instead of the rotary connecting mechanism 7, the other gripping portion 3 can be connected to the connecting portion 6 so as to be slidable in the left-right direction.

  The present invention is not limited to the caisson 13 in the water that is shifted from the normal position, but can be applied to the case where the caisson 13 in the normal position is moved to another position. That is, it is applicable when the caisson 13 in the water is moved because the inside sand is filled (filled to some extent).

DESCRIPTION OF SYMBOLS 1 Holding device 2 Grasp part 2a, 2b Ballast water chamber 2c, 2d Discharge line 3 Grasp part 3a, 3b Ballast water chamber 3c, 3d Discharge line 4 Pump 5a, 5b, 5c Hydraulic jack 6 Connection part 6a Positioning part 7 Rotation connection mechanism 8 Opening / closing port 9 Discharge port 10a, 10b, 10c, 10d Hanging wire 11a, 11b Crane 12 Work ship 13 Caisson W Ballast water

Claims (5)

  A pair of left and right grips variably connected to each other, a ballast water chamber provided in the pair of left and right grips, and ballast water adjusting means for adjusting the amount of water in the ballast water chamber, When the gap between the pair of left and right grips is narrowed, the inside is filled with filling sand and is held across the caisson in the water. A caisson moving holding device characterized by the above.   The caisson moving holding device according to claim 1, wherein two ballast water chambers are arranged side by side in the front-rear direction on the pair of left and right grips.   The holding device for caisson movement according to claim 1 or 2, wherein a hydraulic jack that moves forward and backward in the left-right direction is provided on a laterally inner side surface of the pair of left and right grips.   The caisson moving holding device according to any one of claims 1 to 3 is suspended through a suspension wire of a crane mounted on a work ship, and the gap between the pair of left and right grips is widened. Next, the holding device is lowered so that the caisson that is filled with the inside sand and is in the water is positioned between the pair of left and right grips in the expanded state. Narrow the gap between the gripping parts and hold them with caissons, and then adjust the amount of water in each ballast water chamber to create buoyancy in the holding device, and hold this via the suspension wire A caisson moving method characterized in that the caisson is lifted from the bottom of the water by raising the device and moved to a target position in a state where the caisson is lifted underwater by moving a work ship.   The method of moving a caisson according to claim 4, wherein when the caisson is levitated from the bottom of the water, the caisson is levitated vertically upward while remaining in water.

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