JP2023059098A - Cylindrical body for installation on water bottom, and method for installing the same on water bottom - Google Patents

Abstract

To provide a cylindrical body for installation on a water bottom and a method for installing the same on a water bottom which can reduce the load on a crane when erecting a cylindrical body and in which a work can be safely and efficiently carried out.SOLUTION: A cylindrical body 1 for installation on a water bottom comprises: a cylindrical body main body 2 having both ends opened; a partition wall member 7 that partitions an interior longitudinal direction of the cylindrical body main body 2 into an upper compartment 5 and a lower compartment 6; detachable cover members 8, 9 for closing the openings at both ends of the cylindrical body main body 2; and pressurizing and depressurizing means 14 for pressurizing and depressurizing the inside of the lower compartment 6. The cylindrical body 1 for installation on a water bottom can stand up in water by using the buoyancy of the lower compartment 7.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a water bottom installation cylindrical body used for structures installed on or in water, such as foundations and piers of bottom-mounted offshore wind power generation equipment, and a method for installing the same on the water bottom.

As for bottom-mounted offshore wind power generation facilities, there is known one in which wind turbine facilities and the like are supported on a monopile foundation composed of a tubular body penetrated into the sea bottom ground. In addition, in structures such as piers, there is known a structure in which a superstructure is supported by tubular bodies (steel pipe piles) penetrated into the seabed ground.

In order to install a bottom-mounted offshore wind power generation facility as an above-water or underwater structure, first of all, a cylindrical body for installation on the bottom of the water such as a monopile manufactured in a land factory or production yard, a wind turbine, and a column supporting the wind turbine etc. to the base port, load it on the SEP ship using the crane of the elevating barge (hereinafter referred to as the SEP ship) at the base port, and transport the cylindrical body for installation to the installation sea area by the SEP ship. There are methods, etc.

After arriving at the installation sea area, the leg of the SEP ship is lowered and grounded, and the SEP ship main body supported by the leg is raised above the water to stabilize the SEP ship main body against waves and the like.

Next, using the crane of the SEP ship, a tubular body for installation on the bottom of the water such as a monopile loaded on the SEP ship is lifted up and erected, and in that state, it is lowered to the bottom of the sea and landed on the bottom.

Then, the head portion of the water bottom installation cylindrical body that has landed on the water bottom ground is driven by a hammer or the like, and the water bottom installation cylindrical body is penetrated into the water bottom ground and installed.

Next, the wind turbine and the column supporting the wind turbine are lifted by the crane of the SEP ship and connected to the installed cylindrical body for installation on the bottom of the water to complete the installation of the bottom-mounted offshore wind power generation facility.

That is, the process from construction of the foundation to installation of the wind turbine is constructed in a stable state by the SEP ship.

On the other hand, as a method of transporting the bottom-installed cylindrical body to the installation sea area, there is also known a method of closing the openings at both ends of the cylindrical body with lid members and floating the cylindrical body on water to tow it.

In this method, the tubular body is towed to an installation sea area, and the tubular body is erected by an SEP ship or a crane ship after the cover members that close both ends of the tubular body are removed.

JP 2012-112239 A

However, in recent years, along with the increase in the size of wind turbines and other wind turbines, the tubular bodies that make up the monopile foundations that support the wind turbines have also become heavier and longer. In some cases, it becomes difficult to load the cylindrical body into the hull, transfer the loaded cylindrical body, and erect the loaded cylindrical body.

In that case, it is necessary to separately arrange a large crane ship having a crane with a higher lifting capacity than the crane of the SEP ship, and there is a problem that the cost increases and the work becomes large-scale.

In addition, even when both end openings of the cylindrical body are closed with cover members and the cylindrical body is towed while floating on water, a large hoist ship is used to raise the cylindrical body. necessary.

It is also conceivable to use the buoyancy of the cylindrical body to stand it up while the openings at both ends of the cylindrical body are closed with cover members, thereby reducing the lifting load of the crane. There is a problem that it is difficult to safely detach the cover member that closes the openings at both ends from the cylindrical body after the cylindrical body is erected.

Therefore, in view of such conventional problems, the present invention provides a water bottom installation cylindrical body and its water bottom that can reduce the burden on the crane when erecting the cylindrical body and can work safely and efficiently. It is intended to provide an installation method.

In order to solve the conventional problems as described above, the feature of the invention described in claim 1 is a bottom-installed tubular body which is installed by penetrating into the ground of the bottom of the water. A partition member for partitioning the interior of the tubular body into an upper compartment and a lower compartment in the longitudinal direction, a detachable cover member for closing openings at both ends of the tubular body, and pressurizing and depressurizing the interior of the lower compartment. It is provided with pressurizing and depressurizing means.

According to the second aspect of the invention, in addition to the configuration of the first aspect, the pressurizing and depressurizing means includes an air pipe having one end exposed in the lower compartment and a pressure regulating valve for adjusting the pressure in the air pipe. and a pump for pressurizing and depressurizing the inside of the lower compartment through the air pipe, one end of which communicates with the lower compartment through the partition member, and the other end of which penetrates the peripheral wall of the upper compartment. It is connected to the pump installed outside.

The feature of the invention according to claim 3 resides in that, in addition to the configuration of claim 1 or 2, an opening penetrating the partition member and a lid member for the partition closing the opening are provided. .

The feature of the invention according to claim 4 is that, in addition to the configuration according to any one of claims 1 to 3, the lid member includes a bearing pressure portion made of a steel material and a plug protruding from one side of the bearing pressure portion. part or all of the plug part is made of rubber or reinforced plastic.

The feature of the invention according to claim 5 is that, in addition to the configuration according to any one of claims 1 to 4, the cover member closing the opening on the lower compartment side has one end closing the opening on the lower compartment side. It is provided with a connecting wire connected to the lid member and a floating body connected to the other end of the connecting wire.

The feature of the invention according to claim 6 is that the cylindrical body is erected, the lower end of the cylindrical body is grounded on the waterbed ground, and then the cylindrical body is penetrated into the waterbed ground and installed. In the method for installing a tubular body on the bottom of the water, the tubular body is partitioned into an upper compartment and a lower compartment by a partition member in the longitudinal direction, and the tubular body has both end openings closed by detachable lid members. is laid on the water, and with the cylindrical body floating in the water, the upper compartment side of the cylindrical body is rotated upward to stand the cylindrical body, and then in the lower compartment is pressurized to detach the lid member closing the opening on the lower compartment side, and thereafter, the lower end of the tubular body is brought to rest on the bottom of the sea while decompressing the inside of the lower compartment.

The feature of the invention according to claim 7 is that, in addition to the configuration of claim 6, the cylindrical body gripping means rotatably supported on the ship grasps the cylindrical body that floats in the state of being laid on the water, The tubular body is erected by rotating the tubular body gripping means to rotate the upper compartment side of the tubular body upward while floating the tubular body in water.

According to the eighth aspect of the invention, in addition to the configuration of the sixth or seventh aspect, the pressure inside the lower compartment is reduced while the cylindrical body is made to penetrate the submerged ground.

The feature of the invention according to claim 9 is, in addition to the configuration according to any one of claims 6 to 8, a cover member that closes the upper compartment side opening after the cylindrical body is penetrated into the water bottom ground. is to be removed.

According to the tenth aspect of the invention, in addition to the configuration of the ninth aspect, the lid member closes the upper compartment side opening after the lower compartment side of the cylindrical body is grounded on the seabed ground. to drive the tubular body into the submerged ground.

The feature of the invention according to claim 11 resides in that, in addition to the configuration of any one of claims 6 to 8, water is poured into the upper compartment after the cylindrical body is grounded on the water bottom ground.

The feature of the invention according to claim 12, in addition to the configuration of any one of claims 6 to 10, is provided with an opening penetrating the partition member and a lid member for the partition closing the opening, The lid member for the partition wall is removed after the cylindrical body is penetrated into the submerged ground.

The feature of the invention according to claim 13 is that, in addition to the configuration of claim 6 or 7, an opening penetrating the partition member and a lid member for the partition closing the opening are provided, and the cylindrical body is grounded on the water bottom ground, the lid member for the partition wall is removed.

The feature of the invention according to claim 14 is that, in addition to the configuration according to any one of claims 6 to 13, the cylindrical body with both end openings closed with lid members is laid on water and floated to the construction site. To be towed.

The tubular body for installation on the bottom of the water according to the present invention has the configuration described in claim 1, so that when the tubular body is erected, the buoyancy of the tubular body itself is used to reduce the load on the crane. can be done.

In addition, in the present invention, by providing the configuration described in claim 2, the pressure in the lower compartment can be suitably adjusted, and the work from standing up of the bottom-installing cylindrical body to landing on the bottom can be performed smoothly. can be done.

Moreover, in the present invention, by providing the configuration according to claim 3, the lid member for the partition can be reused, and the material cost can be reduced.

In addition, in the present invention, by providing the configuration according to claim 4, the pressure can be resisted by the pressure-bearing portion, the opening can be reliably fitted by the plug portion, and the opening can be sealed, and , the plug can be removed smoothly due to its light weight.

Further, in the present invention, by providing the configuration of claim 5, it is possible to accurately grasp the position of the lid member that has been removed underwater, and to easily recover it from the water surface.

Further, in the present invention, by providing the configuration according to claim 6, when the tubular body is raised, the buoyancy of the tubular body itself can be used to reduce the load on the crane.

In addition, in the present invention, by providing the configuration described in claim 7, it is possible to hold the bottom-installed cylindrical body in a stable state until the buoyancy of the lower compartment is removed.

In the present invention, by providing the configuration of claim 8, the penetration work can be efficiently performed by reducing the pressure in the lower compartment.

In the present invention, by providing the configuration according to claim 9, the lid member can be reused and the material cost can be reduced.

In the present invention, by providing the configuration of claim 10, it is possible to use the upper lid member as a receiving member for closing the upper compartment side opening, and prevent damage to the main body of the tubular body during driving. , it is possible to reduce underwater noise when the cylindrical body is placed.

In the present invention, by providing the structure described in claim 11, the load of the taken-in water is applied, and the bottom-installing cylindrical body can be smoothly lowered, and the work of landing on the bottom and the work of penetrating can be performed smoothly. .

In the present invention, by providing the configuration according to claim 12, the pressure in the lower compartment can be smoothly reduced when penetrating into the ground, the penetration work can be performed efficiently, and the removed partition wall Since the lid member for the container can be reused, the material cost can be reduced.

In the present invention, by providing the structure described in claim 13, the pressure in the lower compartment can be released, and the removed lid member for the partition can be reused, thereby reducing the material cost. can be done.

In the present invention, by providing the configuration according to claim 14, even a large cylindrical body that is difficult to load on a barge such as an SEP ship can be suitably moved to the installation water area.

1(a) is a front view showing an example of a bottom-installed cylindrical body according to the present invention, and FIG. 1(b) is a cross-sectional view taken along the line AA. It is a partial expanded sectional view which shows a partition part same as the above. Fig. 3 is a partially enlarged cross-sectional view showing a lower compartment-side opening of the same. (a) is a partially enlarged cross-sectional view showing the opening on the upper compartment side of the same, (b) is a partially enlarged cross-sectional view showing the state at the time of placing the same, and (c) is the opening on the upper compartment side of the same. It is a partially enlarged cross-sectional view showing the aspect of. 1 is a front view showing an example of an elevating barge used in a method for installing a cylindrical body for installation on the bottom of water according to the present invention; FIG. Fig. 3 is a plan view omitting the description of the same crane; 1 is a front view, omitting description of a crane, showing a state at the start of work in a method for installing a cylindrical body for installation on the bottom of water according to the present invention; FIG. Fig. 10 is a front view, omitting description of a crane, showing a state at the start of erecting work of the bottom-installed tubular body of the same; It is a top view same as the above. Fig. 10 is a front view, omitting the illustration of a crane, showing a state of the bottom-installed cylindrical body of the same as the above at the time of erecting work; Fig. 3 is a front view of the crane, omitting the illustration, showing a state in which the bottom-of-water installation cylindrical body is erected; It is a top view same as the above. Fig. 10 is a front view, omitting illustration of a crane, showing a state during work for removing the lower lid member of the same; FIG. 10 is a front view, omitting description of a crane, showing a state of bottom-bottoming operation of the bottom-installed tubular body of the same. Fig. 10 is a front view, omitting description of the crane, showing a state when the bottom-of-water installation tubular body of the same is started to penetrate into the ground of the bottom of water; Fig. 10 is a front view of a crane, omitting description, showing a state in which the bottom-installing cylindrical body is penetrated into the bottom ground and the upper lid member and the partition wall lid member are removed;

Next, an embodiment of the tubular body for installation on the bottom of water according to the present invention will be described based on the examples shown in FIGS. 1 to 4. FIG. Reference numeral 1 in the figure denotes a cylindrical body for installation on the bottom of water, such as a monopile, which is used for the foundation of an offshore wind power generation facility or the like.

As shown in FIG. 1, the bottom-installed tubular body 1 is composed of a tubular body 2 made of a steel pipe or the like, which is open at both ends, and is designed to be installed by penetrating into the bottom ground 3 . Incidentally, reference numeral 4 in the figure denotes the surface of the water.

The bottom-installed cylindrical body 1 includes a partition wall member 7 that divides the interior of the cylindrical body body 2 into an upper compartment 5 and a lower compartment 6 in the longitudinal direction, and closes openings at both ends of the cylindrical body body 2 . Detachable lid members (hereinafter referred to as an upper lid member 8 and a lower lid member 9, respectively) are provided, and by closing both end openings of the cylindrical body 2 with the lid members 8 and 9, the cylindrical body 2 is floated on the water in a lying state. It is possible to do so.

The cylindrical body main body 2 is made of a steel pipe or the like, and has a tapered cylindrical portion 2b in a truncated cone shape connected to the upper end of a cylindrical base pipe portion 2a. is formed to have a larger diameter than the opening of the The form of the tubular body 2 is not limited to this embodiment, and the tapered tubular portion 2b may not be provided at the upper end.

In addition, slinging projections 10, 10 are protruded from the outer surface of the upper compartment 5 of the cylindrical body 2, and the slinging projections 10, 10 are connected to a hoisting wire 28 of a crane 23 for hoisting. , the bottom-installed cylindrical body 1 is raised and erected.

The partition member 7 is formed of steel, rubber, reinforced plastic, or the like in an annular shape having an opening 7a in the center. is partitioned into an upper compartment 5 and a lower compartment 6.

The position at which the partition wall member 7 is provided in the bottom-installed tubular body 1 varies depending on the depth at which the bottom-installed tubular body 1 is placed. Secondly, air pressure is applied to the lower compartment 6 in order to remove the lower cover member 9 that closes the opening on the lower compartment side, provided at a position above the surface of the seabed 3 and near the surface of the seabed 3. It is desirable to reduce the amount of air for the actual pressure.

The central opening 7a of the partition member 7 is closed by a detachable partition lid member (hereinafter referred to as a partition lid member) 11, and the partition lid member 11 can be removed depending on the situation and application. It is possible.

In order to ensure sufficient airtightness with the partition lid member 11, the partition member 7 has an axial length longer than the plate thickness of the partition member 7 at the central portion, as shown in FIG. A cylindrical portion 7b projecting to the 6 side may be provided, and the opening portion 7a may be formed inside the cylindrical portion 7b.

The partition lid member 11 includes a disk-shaped bearing pressure portion 11a, a plug portion 11b protruding from one surface of the bearing pressure portion 11a (a surface facing the compartment member 7), and a plug portion of the pressure bearing portion 11a. It has a plug-like shape with an annular packing portion 11c arranged on the outer edge of the side surface.

The pressure bearing portion 11a is made of a rigid member such as steel, and is formed in a disc shape having a certain thickness, and its outer diameter is larger than the inner diameter of the opening portion 7a.

The plug portion 11b protrudes from one surface of the pressure bearing portion 11a (the surface facing the compartment member 7), and is formed in a donut shape (cylindrical truncated cone shape) from a member having a certain rigidity such as steel or reinforced plastic. and a water stop member 11e made of an elastic member such as a rubber material covering the outer periphery of the core portion 11d, which is press-fitted into the opening portion 7a.

Further, the fitting strength of the plug portion 11b of the partition lid member 11 to the partition member 7 is set to be higher than the fitting strength of the plug portion 9b of the lower lid member 9 to the opening on the lower compartment side. there is

The partition lid member 11 can be reduced in weight and can be easily removed by forming the core portion 11d of reinforced plastic.

Also, the plug portion 11b may be integrally formed of a material such as reinforced plastic that has a certain rigidity and is capable of exhibiting elasticity. A wound screw portion may be provided so that it can be screwed into the opening 7a. When the partition member 7 and the partition lid member 11 are both made of steel, they can be fixed by welding.

The packing portion 11c is formed in an annular shape by an elastic member such as a rubber material, and is interposed between the pressure bearing portion 11a and the upper surface of the partition member 7. As shown in FIG.

The form of the partition lid member 11 is not limited to the above embodiment, and can be set in consideration of the strength of the air pressure when standing up and the strength of the air pressure when the pressure inside the lower compartment 6 is reduced.

The partition lid member 11 has a smaller diameter than the opening on the upper compartment 5 side, so that the partition lid member 11 can be removed from the partition member 7 and removed from the opening on the upper compartment 5 side depending on the situation. It's becoming

As shown in FIG. 3, the lower cover member 9 includes a disc-shaped bearing pressure portion 9a and a plug portion 9b protruding from one surface of the pressure bearing portion 9a (the surface facing the opening on the lower compartment side). , and an annular packing portion 9c disposed on the outer edge of the side surface of the plug of the bearing portion 9a.

The pressure-bearing portion 9a is made of a rigid member such as a steel material and is formed in a disk shape having a certain thickness, and the outer diameter thereof is formed larger than the inner diameter of the opening on the lower compartment side.

The plug portion 9b is protruded from one surface (the surface facing the opening on the lower compartment side) of the bearing portion 9a, and is shaped like a doughnut (cylindrical truncated cone) by a member having a certain rigidity such as steel or reinforced plastic. and a water stop member 9e made of an elastic member such as a rubber material covering the outer periphery of the core 9d, and is press-fitted into the opening on the lower compartment side. The weight of the lower lid member 9 can be reduced by forming the core portion 9d of a reinforced plastic, and the removal of the lower lid member 9 can be facilitated.

In addition, the plug portion 9b may be integrally formed of a material such as reinforced plastic that has a certain degree of rigidity and is capable of exhibiting elasticity.

The packing portion 9c is formed in an annular shape by an elastic member such as a rubber material, and is interposed between the bearing portion and the upper surface of the partition member 7. As shown in FIG.

One end of a connecting wire 12 is connected to the lower cover member 9 , and a floating body 13 such as a buoy is connected to the other end of the connecting wire 12 . floats above the water, the position of the lower lid member 9 in the water can be easily grasped, and the lower lid member 9 can be easily recovered from the water.

As shown in FIG. 4(a), the upper lid member 8 includes a disk-shaped bearing pressure portion 8a and a plug portion protruding from one surface (the surface facing the opening on the upper compartment side) of the pressure bearing portion 8a. 8b and has a plug shape.

The pressure bearing portion 8a is made of a rigid member such as a steel material and is formed in a disk shape having a certain thickness, and the outer diameter thereof is formed to be larger than the inner diameter of the upper compartment side opening.

The plug portion 8b is protruded from one surface (the surface facing the upper compartment side opening) of the bearing portion 8a, and is shaped like a doughnut (cylindrical truncated cone) by a member having a certain rigidity such as steel or reinforced plastic. and a water stop member 8e made of an elastic member such as a rubber material covering the outer periphery of the core 8d, and is press-fitted into the upper compartment side opening. The weight of the upper lid member 8 can be reduced by forming the core portion 8d of reinforced plastic, and the removal can be facilitated.

Also, the plug portion 8b may be integrally formed of a material such as reinforced plastic that has a certain rigidity and is capable of exhibiting elasticity.

As shown in FIG. 4(b), the upper cover member 8 has the bearing pressure portion 8a directly in contact with the upper compartment side opening edge, and the impact energy of the impact acting on the bearing pressure portion 8a is directly propagated. When the head of the bottom installation cylindrical body 1 is driven into the bottom ground 3 by a hammer or the like, it is attached so as to function as a receiving member at the time of driving. Further, by installing the upper cover member 8 at the time of driving, it is possible to reduce the underwater noise that propagates into the water at the time of driving.

As shown in FIG. 4(c), the upper lid member 8 is provided with a cylindrical overhang receiving portion 2a inside the upper compartment side opening, and the outer diameter of the bearing pressure portion 8a is adjusted to the upper compartment side opening. , and the plug portion 8b may be press-fitted inside the projecting receiving portion 2a. It should be noted that the same reference numerals are given to the same configurations as those of the above-described embodiment, and the description thereof will be omitted.

In this case, the pressure bearing portion 8a enters the inside of the tubular body 2 through the upper compartment side opening, and when the bottom-installing tubular body 1 penetrates the waterbed ground 3, the upper surface of the tubular body 2 is It is driven by a hammer or the like.

In addition, the bottom-installed tubular body 1 is provided with a pressurizing/depressurizing means 14 for pressurizing and depressurizing the inside of the lower compartment 6, and by adjusting the pressure inside the lower compartment 6, the separation of the lower cover body 9 can be prevented. It is designed so that the cylindrical body 2 can be smoothly placed on and penetrated into the submerged ground 3 .

As shown in FIG. 2, the pressurization/decompression means 14 includes a pair of air pipes (hereinafter referred to as an air supply pipe 15 and an air intake pipe 16) one end of which is exposed in the lower compartment 6, and each air pipe 15 , 16, the air supply pipe 15 is connected to the air supply pump 18, and the air intake pipe 16 is connected to the suction pump 19, respectively. It can be pressurized and depressurized.

Both air pipes 15 and 16 have one end penetrating the partition member 7 to communicate with the inside of the lower compartment 6, and the other end penetrating the peripheral wall of the upper compartment 5 to connect to pumps 18 and 19 installed outside. Since it is connected and the other end side is provided outside the peripheral wall, it becomes easy to pressurize the inside of the lower compartment 6 .

Next, a method for installing the bottom-installed cylinder will be described based on the embodiments shown in FIGS. 5 to 16. FIG. Reference numeral 20 in the figure denotes an elevating barge (hereinafter referred to as an SEP boat) used for installing the bottom-of-water installation cylindrical body 1 . 6 and subsequent drawings, the description of the crane 23 is omitted for the sake of convenience.

As shown in FIGS. 5 and 6, the SEP ship 20 includes a SEP ship body 21 that moves on water, a plurality of legs 22, 22 . and a crane 23 installed thereon.

In addition, the SEP ship 20 is provided with a cylindrical body gripping means 24 rotatably supported by the SEP ship main body 21, and the cylindrical body gripping means 24 can grip the bottom installation cylindrical body 1. It's like

The cylindrical body gripping means 24 has a gripping body 25 that grips the bottom-installed cylindrical body 1, and the side portion of the gripping body 25 is supported by a rotating shaft 26. 27 to rotate.

The gripping body 25 opens and closes between a state in which the pair of opening/closing arm portions 25a, 25a are rotated to open in a U shape, and a state in which both the opening/closing arm portions 25a, 25a are closed to grip the underwater bottom installation cylindrical body 1. It is arranged so that the opening side having both opening/closing arm portions 25a, 25a can be opened downward when the gripper 25 is rotated downward.

After the SEP ship 20 moves to the installation sea area of the seabed installation tubular body 1, as shown in FIG. 5, the legs 22, 22, . The SEP ship main body 21 supported by the water is raised above the water, and the SEP ship main body 21 is put in a stable state against waves and the like.

On the other hand, in a factory or production yard on land, the bottom-installed cylindrical body 1 is manufactured, and the openings at both ends of the cylindrical body 2 and the openings 7a of the partition members 7 are formed into the upper lid member 8, the lower lid member 9, and the partition wall. It is closed by a lid member 11, and the bottom installation cylindrical body 1 is floated on the water and towed to the installation sea area.

At the time of towing, both openings of the tubular body 2 are covered with water stop members 8e, 9e, and the plug portions 8b, 9b are press-fitted into the openings. Both openings are watertight to prevent water from entering the tubular body 2 . Further, in the lower lid member 9, the pressure bearing portion 9a is pressed toward the tubular body main body 2 by water pressure, and the packing portion 9c is compressed, so that a higher water cutoff property can be obtained.

Next, as shown in FIG. 7, the towed tubular body 1 for installation on the bottom of the water is laid alongside the SEP ship 20 and moored as necessary.

Next, as shown in FIGS. 8 and 9, the gripping body 25 is rotated to a position where the opening side of the gripping body 25 faces obliquely downward so that the opening opens toward the bottom-installed tubular body 1 side, A suspension wire 28 is slinged on the slinging projection 10, and in this state, the upper compartment 5 side is lifted by the crane 23 of the SEP ship 20 while the lower compartment 6 side is floating in the water.

At this time, since the lower compartment 6 side is in a state of floating in the water, the buoyancy of the lower compartment 6 side acts on the bottom-installed cylindrical body 1, and the load acting on the crane 23 is reduced accordingly. Therefore, it is possible to deal with even the bottom-installed tubular body 1 that conventionally needs to be lifted by a crane having a lifting capacity greater than that of the crane 23 of the SEP ship 20 .

At this time, water pressure higher than that during towing acts on the lower lid member 9, but since the bearing pressure portion 9a with high rigidity is in contact with the opening edge on the lower compartment side, the lower lid member 9 is lifted by the water pressure. 9 is prevented from being deformed and water from entering into the tubular body main body 2 side.

Further, the bottom-installed cylindrical body 1 that has been tilted is guided to the inside of the gripping body 25, and is temporarily gripped by closing the opening/closing arm portions 25a, 25a. can.

Next, as shown in FIGS. 10 to 12, the suspension wire 28 is hoisted up by the crane 23, and the bottom compartment 6 side is floated in the water, and the water bottom installation tubular body 1 is lifted from the tilted state to the upright position. Launch.

At this time, the gripper 25 is rotated together with the rotation of the bottom-installed tubular body 1, and when the bottom-installed tubular body 1 is in an upright state, the gripper 25 securely grips the bottom-installed tubular body 1, and the bottom-installed tubular body 1 is held. 1 restricts buoyant behavior.

Next, as shown in FIG. 13, the pressurizing/depressurizing means 14 raises the pressure in the lower compartment 6 to a level equal to or higher than the water pressure applied to the lower lid member 9, and the lower lid member closes the opening on the lower compartment 6 side. 9 is removed from the opening.

At this time, the plug portion 9b press-fitted into the opening on the lower compartment side does not increase the degree of close contact between the water shutoff member 9e and the tubular body 2 due to the water pressure due to its structure, and the fitting strength fluctuates. do not.

On the other hand, the partition lid member 11 has a water cutoff member 11e press-fitted into the opening 7a so that the plug portion 11b does not slip out of the opening 7a due to an increase in pressure in the lower compartment 6. As shown in FIG.

When the lower lid member 9 is separated from the opening underwater, the floating body 13 connected via the connecting wire 12 floats on the surface of the water. The connecting wire 12 can be wound up from the lower lid member 9 to lift it above the water to be recovered and reused.

Next, as shown in FIG. 14, the pressurization/decompression means 14 draws in the air in the lower compartment 6 to lower the pressure. The lower end of the installation cylindrical body 1 is made to land on the water bottom ground 3 .

At this time, water may be injected into the upper compartment 5 to accelerate the descent of the bottom-installed cylindrical body 1 by the load caused by the water injection. can enhance sexuality.

In addition, since the partition lid member 11 is in a state where the bearing pressure portion 11a having a high rigidity is in contact with the partition member 7 via the packing portion 11c, the hydraulic pressure of the water injected into the upper compartment 5 and the lower compartment 6 are reduced. Deformation of the partition lid member 11 and entry of water into the lower partition chamber 6 side due to the internal pressure reduction are prevented.

Next, as shown in FIG. 15 , the upper lid member 8 of the bottom-mounted tubular body 1 is hammered with a hammer or the like to cause the bottom-installed tubular body 1 to penetrate into the ground 3 .

At this time, as shown in FIG. 4(b), no packing or the like is interposed between the bearing pressure portion 8a of the upper cover member 8 and the edge of the upper compartment side opening of the tubular body 2. Since the pressure-bearing portion 8a is in direct contact with the edge of the opening on the side of the upper compartment, the impact energy generated by hammering the upper lid member 8 (the pressure-bearing portion 8a) with a hammer is efficiently transferred to the cylindrical body 2. It is designed to propagate.

At this time, the pressurizing/depressurizing means 14 sucks in the air in the lower compartment 6 to reduce the pressure, thereby reducing the resistance caused by the air remaining in the lower compartment 6 and allowing the bottom-installed cylindrical body 1 to move. It can be smoothly penetrated into the submerged ground 3 .

In addition, a water injection pipe (not shown) may be provided to communicate between the inside of the upper compartment 5 and the inside of the lower compartment 6 so that water can be injected into the lower compartment 6 as well. It is even better to inject water in conjunction with the intake of air, which can further increase the penetration.

Then, before the submerged ground 3 reaches the position of the partition member 7, the placing is interrupted.

Finally, as shown in FIG. 16, after penetrating the water bottom installation cylindrical body 1 into the water bottom ground 3, the upper lid member 8 is removed, the partition lid member 11 is removed from the upper opening, and the water bottom installation cylinder 1 is removed. Installation of the cylindrical body 1 is completed.

It should be noted that the partition lid member 11 should be removed when the bottom-installed tubular body 1 reaches the bottom of the water, not after the bottom-installed tubular body 1 has penetrated the water bottom ground 3. may In that case, by removing it when it reaches the bottom, when pouring water into the bottom installation cylindrical body 1, even if there is no water injection pipe connecting the inside of the upper compartment 5 and the inside of the lower compartment 6, the lower compartment 6 can be removed. water can be smoothly injected into the

In the above-described embodiment, the upper lid member 8 is left attached and the case where the upper lid member 8 is used as a receiving member is driven in with a hammer. You may make it drive in an end face. Also, a member other than the upper lid member 8 may be used as a receiving member during driving.

In the above-described embodiment, the opening 7a is provided in the partition member 7, and the opening 7a is closed by the partition lid member 11. The chamber 5 and the lower compartment 6 may be partitioned. In this case, since it is not necessary to remove the partition lid member 11, the construction period can be shortened.

Further, in the above-described embodiment, the case of using the cylindrical object gripping means 24 in which the gripping object 25 rotates has been described, but a general pile gripper is used, and after the underwater bottom installation tubular object 1 stands up, the pile gripper is used. A gripper may be used to hold the object.

Furthermore, in the above-described embodiment, the cover members 8 and 9 are fitted into the openings. You may make it

1 Cylindrical body for installation on the bottom of water 2 Cylindrical body main body 3 Water bottom ground 4 Water surface 5 Upper compartment 6 Lower compartment 7 Partition member 8 Upper lid member 9 Lower lid member 10 Slinging projection 11 Lid member for partition 12 Connecting wire 13 Floating body 14 Pressure reducing means 15 Air supply pipe 16 Air intake pipe 17 Pressure regulating valve 18 Air supply pump 19 Suction pump 20 SEP ship 21 SEP ship main body 22 Leg 23 Crane 24 Cylindrical body gripping means 25 Gripping body 26 Rotating shaft 27 Power unit 28 suspension wire

Claims (14)

In the water bottom installation cylindrical body that is installed by penetrating the water bottom ground,
A tubular body having both ends opened, a partition member partitioning the interior of the tubular body into an upper compartment and a lower compartment in the longitudinal direction, and a detachable partition member closing the openings at both ends of the tubular body. A cylindrical body for installation on the bottom of water, comprising: a lid member; The pressurizing and depressurizing means includes an air pipe with one end exposed in the lower compartment, a pressure regulating valve for adjusting the pressure in the air pipe, and a pump for pressurizing and depressurizing the inside of the lower compartment through the air pipe,
2. The air pipe according to claim 1, wherein one end of the air pipe communicates with the lower compartment through the partition member, and the other end penetrates the peripheral wall of the upper compartment and is connected to the pump installed outside. Cylindrical body for underwater installation. 3. The tubular body for installation on the bottom of water according to claim 1, further comprising an opening penetrating through the partition member and a lid member for the partition closing the opening. 3. The lid member has a bearing portion made of steel and a plug portion protruding from one side of the bearing portion, and the plug portion is partially or wholly made of rubber or reinforced plastic. 4. The cylindrical body for installation on the bottom of water according to any one of 1 to 3. The lid member for closing the opening on the lower compartment side comprises a connecting wire one end of which is connected to the lid member for closing the opening on the lower compartment side, and a floating body connected to the other end of the connecting wire. The bottom-installed cylindrical body according to any one of claims 1 to 4. In a method for installing a cylindrical body on the water bottom, the cylindrical body is erected, the bottom end of the cylindrical body is placed on the water bottom ground, and then the cylindrical body is penetrated into the water bottom ground and installed.
The cylindrical body is partitioned into an upper compartment and a lower compartment in the longitudinal direction by a partition member,
The cylindrical body, whose both end openings are closed with detachable lid members, is floated while lying on the water, and the upper compartment side of the cylindrical body is rotated upward while the cylindrical body is floating in the water. After the cylindrical body is erected by
detaching the lid member that pressurizes the inside of the lower compartment to close the opening on the lower compartment side;
After that, a method for installing a cylindrical body on the bottom of the water, wherein the lower end of the cylindrical body is brought into contact with the water bottom ground while reducing the pressure in the lower compartment. 7. The method according to claim 6, wherein the tubular body is gripped by a tubular body gripping means rotatably supported by the ship, and the tubular body gripping means is rotated to turn the upper compartment side upward to stand up. A method for installing the cylindrical body in the bottom of the water. 8. The method for installing a cylindrical body on the water bottom according to claim 6, wherein the cylindrical body is penetrated into the water bottom ground while reducing the pressure in the lower compartment. The method for installing a cylindrical body on the bottom of water according to any one of claims 6 to 8, wherein after the cylindrical body is penetrated into the ground of the seabed, a cover member closing the upper opening is removed. 10. The cylindrical body according to claim 9, wherein after the lower compartment side of the cylindrical body is grounded on the seabed ground, the lid member for closing the upper end opening is driven in to penetrate the cylindrical body into the seabed ground. Underwater installation method of the body. 9. The method for installing a cylindrical body on the bottom of water according to claim 6, wherein water is poured into the upper compartment after the cylindrical body has landed on the ground of the water bottom. An opening penetrating through the partition member and a partition lid member closing the opening, wherein the partition lid member is removed after the cylindrical body is penetrated into the waterbed ground. 11. A method for installing a cylindrical body on the bottom of water according to any one of 10. 6. An opening penetrating through said partition member and a partition cover member closing said opening, wherein said partition cover member is removed after said cylindrical body is grounded on said waterbed ground. 8. Alternatively, the method for installing the cylindrical body on the bottom of water according to 7 above. 14. The method for installing a cylindrical body on the bottom of water according to any one of claims 6 to 13, wherein the cylindrical body, whose both end openings are closed with cover members, is towed to a construction site while being floated on the water.

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