JP2017223006A - Suction structure body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suction structure body whose inclination at the time of insertion can be corrected without applying a horizontal load.SOLUTION: A suction structure body 1 constituted of a cylindrical peripheral wall part 2 and a top plate part 3 covering one end of the cylindrical peripheral wall part 2, the suction structure body being inserted into a water bottom ground by discharging water inside the cylindrical peripheral wall part 2, comprises: a plurality of discharge pipes 5 arranged in the cylindrical peripheral wall part 2, the discharge pipes opening to an open end of the cylindrical peripheral wall part 2; a water inlet port 6 to which high-pressure water is supplied; and communication pipes 7 in each of which a water cutoff valve for opening/closing a water passage is provided, the communication pipe connecting the water inlet port 6 with the discharge pipe 5. The plurality of discharge pipes 5 are grouped for each 120 degrees around a center axis P of the cylindrical peripheral wall part 2 into three systems A to C. The communication pipe 7 is provided for each system.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a suction structure that is submerged in a submerged ground or the like as a suction anchor or a skirt suction foundation.

  It consists of a cylindrical peripheral wall part and a top plate part that closes one end of the cylindrical peripheral wall part. A suction structure has been proposed (see, for example, Patent Document 1).

  When penetrating a single suction structure into the underwater ground, the slope during penetration was unavoidable due to the different penetration resistance due to the slope of the formation and the unevenness of the ground strength. Therefore, conventionally, the inclination is corrected by pulling the suction structure horizontally with a vessel such as a tugboat.

JP2015-34430A

  However, the method of correcting the inclination by pulling the suction structure horizontally increases the procurement cost of the ship, makes fine adjustment difficult, and gives an excessive horizontal load to the skirt suction. And there was a problem in structural strength.

  This invention is made | formed in view of such a condition, and is providing the suction structure which can correct the inclination at the time of penetration without eliminating the above-mentioned subject and giving a horizontal load.

The suction structure of the present invention is composed of a cylindrical peripheral wall portion and a top plate portion that closes one end of the cylindrical peripheral wall portion, and is inserted into the bottom ground by discharging water in the cylindrical peripheral wall portion. A plurality of discharge pipes piped to the cylindrical peripheral wall portion and opened at an open end of the cylindrical peripheral wall portion, a water injection port to which high-pressure water is supplied, and the water injection port and the discharge pipe are connected to each other. And a communication pipe provided with a water stop valve for opening and closing the water passage, wherein the plurality of discharge pipes are grouped at a predetermined angle with respect to the central axis of the cylindrical peripheral wall portion. The communication pipe is provided for each of the systems.
Furthermore, in the suction structure according to the present invention, the openings of the plurality of discharge pipes may be arranged at equal intervals at the open ends of the cylindrical peripheral wall portion.
Furthermore, in the suction structure of the present invention, the interval between the openings of the discharge pipes adjacent to each other may be set shorter than the wall thickness of the cylindrical peripheral wall portion.

  According to the present invention, by selectively injecting water jets from three or more discharge pipes of a plurality of systems, the inclination at the time of penetration can be corrected without giving a horizontal load, and at low cost, after the penetration. There is an effect that it is possible to construct a suction structure having excellent verticality.

It is a longitudinal section showing the composition of the embodiment of the suction structure concerning the present invention. It is the figure which looked at the suction structure shown in FIG. 1 from the open end side. It is an enlarged view of the open end shown in FIG. It is a figure which shows the structure of the water inlet shown in FIG. 1, and a communicating pipe. It is a figure which shows the structure of the communicating pipe and discharge pipe shown in FIG. It is a block diagram which shows the structure of the inclination control apparatus which controls the inclination of the suction structure shown in FIG.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings.

  Referring to FIG. 1, the suction structure body 1 of the present embodiment includes a cylindrical peripheral wall portion 2 and a top plate portion 3 that closes one end of the cylindrical peripheral wall portion 2. In the present embodiment, the cylindrical peripheral wall portion 2 is formed in a cylindrical shape, and the top plate portion 3 is formed in a substantially hemispherical shape. The cross-sectional shape of the suction structure 1 (cylindrical peripheral wall portion 2) is not limited to a circle, but may be a polygon. Moreover, the top plate part 3 does not necessarily need to be a curved surface, and may be a flat plate.

  The cylindrical peripheral wall portion 2 and the top plate portion 3 can be appropriately configured with materials such as reinforced concrete, prestressed concrete, steel, etc., and have a diameter depending on the strength and proof stress required for horizontal force and pulling force. The height and wall thickness are appropriately set.

  A drain port 4 is formed in the top plate portion 3. While connecting the front-end | tip of the suction hose which is not shown in figure to the drain outlet 4, the suction pump connected to the base end side is operated, and the inside space X enclosed by the cylindrical surrounding wall part 2 and the top-plate part 3 is contained. The water can be discharged.

  Further, a discharge pipe 5 that opens to an open end is piped on the cylindrical peripheral wall portion 2. The top plate 3 is provided with a water inlet 6 and a communication pipe 7 connected to the discharge pipe 5 and the water inlet 6.

  While connecting the front-end | tip of the high pressure hose which is not shown in figure to the water injection port 6, the compressor connected to the base end side is operated, and high pressure water is supplied to the water injection port 6. The high-pressure water is guided to the discharge pipe 5 via the communication pipe 7 and is jetted as a water jet from the open end of the cylindrical peripheral wall portion 2.

  A plurality of discharge pipes 5 are piped on the cylindrical peripheral wall portion 2, and referring to FIG. 2, the plurality of discharge pipes 5 open at regular intervals at the open end of the cylindrical peripheral wall portion 2. . FIG. 2 shows an example in which 45 discharge pipes 5 are opened at regular intervals at the open end of the cylindrical peripheral wall 2.

  Referring to FIG. 3, the interval Z between adjacent discharge pipes 5 (openings) at the open end of the cylindrical peripheral wall 2 is set to be shorter than the wall thickness Y of the cylindrical peripheral wall 2.

  Referring to FIG. 4, three communication pipes 7 are connected radially to the water injection port 6 with the water injection port 6 as the center, and each of the one communication pipe 7 is adjacent to the 15 adjacent ones as shown in FIG. 5. It is branched and connected to (45/3) discharge pipes 5. The three communication pipes 7 are each provided with a water stop valve 8 for opening and closing the water passage. The water stop valve 8 of this embodiment is configured to open and close the water passage by an opening and closing operation using a lever.

  Thereby, as shown in FIG. 2, the discharge pipe 5 opened to the open end of the cylindrical peripheral wall portion 2 is divided into three ACs grouped by 120 degrees with respect to the central axis P of the cylindrical peripheral wall portion 2. A water jet is ejected from the discharge pipe 5 of the system which is composed of a system and in which the stop valve 8 is opened. In other words, by operating the water stop valve 8 of the communication pipe 7 provided for each system, water jets can be selectively ejected from the discharge pipes 5 of the three systems A to C.

  When sinking the suction structure 1 on the bottom of the ground, it is installed on the bottom of the water so that the open end side of the cylindrical peripheral wall portion 2 is downward, and then the inner space is passed through the drain port 4 formed in the top plate portion 3. Drain water from X.

  The difference in water pressure generated inside and outside the suction structure 1 due to the discharge of water and the own weight of the suction structure 1 become the pushing force when penetrating the cylindrical peripheral wall portion 2 into the water bottom ground. In addition, the water pressure difference at the same time generates an osmotic flow in the bottom of the ground from the water bottom spreading around the cylindrical peripheral wall portion 2 to the open end of the cylindrical peripheral wall portion 2 toward the inner water bottom. The effective stress of the ground is lowered, and the penetration resistance at the open end of the cylindrical peripheral wall portion 2 is reduced.

  When the suction structure 1 is submerged in the water bottom ground, if the ground strength with which the open end of the cylindrical peripheral wall portion 2 abuts is not uniform, the suction structure 1 is inclined. That is, since the penetration resistance at a location where the ground strength is high is greater than that at a location where the ground strength is low, the penetration speed is slow at locations where the ground strength is high.

  So, in this embodiment, a water jet is injected from the discharge pipe 5 of the system | strain (AC) facing a location where ground strength is large, a ground is loosened, and penetration resistance is reduced rather than another location. Thereby, the inclination of the suction structure 1 is corrected. The direction in which the inclination of the suction structure 1 is corrected can be controlled by selecting a system (A to C) in which a water jet is injected by opening and closing the water stop valve 8. For example, by injecting a water jet from the discharge pipe 5 of the system A, the inclination is corrected in the direction of the system A, and by ejecting a water jet from the discharge pipe 5 of the system A and the system B, the system A and the system A The tilt is corrected in the direction between B and B. It is also possible to finely adjust the direction in which the inclination of the suction structure 1 is corrected by opening a plurality of stop valves 8, adjusting the amount of water jet injection according to how the stop valves 8 are opened. For example, the water jet may be jetted with the system A fully open and the system B half open. In addition, the ground strength reduced by the jet of the water jet recovers with time.

  The jet of water jet from the discharge pipe 5 is used only to correct the inclination of the suction structure 1 and it is not preferable to affect a wide range of ground beyond the wall thickness Y of the cylindrical peripheral wall 2. Therefore, the pressure of the water jet injected from the discharge pipe 5 is set to an extent that affects the ground in the range of the wall thickness Y of the cylindrical peripheral wall portion 2. In the present embodiment, as described above, the interval Z between adjacent discharge pipes 5 (openings) at the open end of the cylindrical peripheral wall portion 2 is set to be shorter than the wall thickness Y of the cylindrical peripheral wall portion 2. . As a result, the water jet can be applied evenly over the entire circumference of the ground where the open end of the cylindrical peripheral wall 2 abuts, and the inclination can be corrected wherever there is a large ground strength.

  In addition, although this embodiment demonstrated the example which consists of 3 system | strains AC of the some discharge pipe 5 grouped for every 120 degrees with respect to the central axis P of the cylindrical surrounding wall part 2, a some discharge pipe 5 may be grouped into four or more systems at predetermined angles with respect to the central axis P of the cylindrical peripheral wall portion 2 so that the water jet injection can be controlled for each system.

  Moreover, you may make it provide the filter which prevents the penetration | invasion of the earth and sand into the opening of the discharge pipe 5, and a pipe | tube. As the filter, a non-woven fabric having finer mesh than the soil particles can be used.

  Further, as shown in FIG. 6, the inclination of the suction structure 1 is controlled by an inclination control device including electromagnetic valves 9 a, 9 b, 9 c provided as the water stop valve 8, an inclination sensor 10, and a valve opening / closing control unit 11. You may make it correct automatically.

  The inclination sensor 10 is attached to the suction structure 1, detects the inclination of the suction structure 1 from the vertical direction, and outputs the inclination direction and the inclination angle to the valve opening / closing control unit 11.

  When the inclination angle input from the inclination sensor 10 exceeds a preset control start threshold angle, the valve opening / closing control unit 11 selectively opens the electromagnetic valves 9a, 9b, 9c according to the inclination direction. The inclination of the suction structure 1 is corrected. When the inclination angle input from the inclination sensor 10 falls below a preset control stop threshold angle (<control start threshold angle), the valve opening / closing controller 11 closes the electromagnetic valves 9a, 9b, 9c.

  The opening operation of the electromagnetic valves 9a, 9b, 9c according to the inclination direction by the valve opening / closing control unit 11 will be described. As shown in FIG. 6, the solenoid valve 9 a is connected to the communication pipe 7 that supplies high-pressure water to the discharge pipe 5 of the A system arranged at 0 to 120 deg with respect to the central axis P of the cylindrical peripheral wall portion 2. An electromagnetic valve 9b is connected to the communication pipe 7 for supplying high-pressure water to the B-system discharge pipe 5 arranged at 120 to 240 deg with respect to the central axis P of the part 2, and 240 to the central axis P of the cylindrical peripheral wall part 2. Electromagnetic valves 9c are respectively attached to the communication pipes 7 for supplying high-pressure water to the C system discharge pipes 5 arranged at ˜360 deg.

  When the inclination direction is 160 to 210 deg, the valve opening / closing control unit 11 opens the electromagnetic valves 9a and 9c to inject water jets from the discharge pipes 5 of the A system and the C system, and when the inclination direction is 270 to 330 deg. To open the electromagnetic valves 9a and 9b to inject water jets from the discharge pipes 5 of the A system and the B system, and when the inclination direction is 30 to 90 deg, the electromagnetic valves 9b and 9c are opened to operate the B system and C A water jet is ejected from the discharge pipe 5 of the system. Further, the valve opening / closing control unit 11 opens the electromagnetic valve 9c when the inclination direction is 90 to 160 deg to inject a water jet from the discharge pipe 5 of the C system, and the electromagnetic valve 9a when the inclination direction is 210 to 270 deg. Is opened to eject a water jet from the discharge pipe 5 of the A system, and when the inclination direction is 330 to 30 degrees, the electromagnetic valve 9b is opened to eject a water jet from the discharge pipe 5 of the B system.

  Further, the valve opening / closing control unit 11 can be configured to be able to control the degree of opening of the electromagnetic valves 9a, 9b, 9c. For example, when the inclination direction is 180 to 210 deg, the valve opening / closing control unit 11 opens the electromagnetic valve 9a fully open and the electromagnetic valve 9c half open so that a strong water jet is discharged from the discharge pipe 5 of the A system. A weak water jet is ejected from each discharge pipe 5. Thus, the direction in which the inclination of the suction structure 1 is corrected can be finely adjusted by controlling the opening degree of the electromagnetic valves 9a, 9b, 9c.

As described above, the present embodiment is configured by the cylindrical peripheral wall portion 2 and the top plate portion 3 that closes one end of the cylindrical peripheral wall portion 2, and drains the water in the cylindrical peripheral wall portion 2. A plurality of discharge pipes 5 that are piped to the cylindrical peripheral wall portion 2 and open to the open end of the cylindrical peripheral wall portion 2, a water injection port 6 to which high-pressure water is supplied, The water injection port 6 and the discharge pipe 5 are connected to each other, and a communication pipe 7 provided with a water stop valve 8 for opening and closing the water passage is provided. The plurality of discharge pipes 5 have a central axis P of the cylindrical peripheral wall portion 2. On the other hand, it is composed of three systems A to C grouped every 120 degrees, and the communication pipe 7 is provided for each system.
With this configuration, by selectively injecting water jets from the three discharge pipes 5, the inclination at the time of penetration can be corrected without giving a horizontal load, and the verticality after penetration is excellent at low cost. The suction structure 1 can be constructed.

Further, in the present embodiment, the openings of the plurality of discharge pipes 5 are arranged at equal intervals at the open end of the cylindrical peripheral wall portion 2.
With this configuration, the inclination at the time of penetration can be corrected by selectively using three water jets regardless of the direction in which hard ground having a high penetration resistance exists.

Further, in the present embodiment, the interval Z between the openings of the adjacent discharge pipes 5 is set to be shorter than the wall thickness Y of the cylindrical peripheral wall portion 2.
With this configuration, the water jet can be applied evenly over the entire circumference where the open end of the cylindrical peripheral wall portion 2 abuts. For example, even when an obstacle (such as a rock) whose diameter is about the wall thickness Y of the cylindrical peripheral wall portion 2 is obstructing the penetration, a water jet can be applied to the obstacle, and the obstacle is cylindrical. It can avoid from the penetration direction of the surrounding wall part 2. FIG.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of these components, and that such modifications are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Suction structure 2 Cylindrical surrounding wall part 3 Top plate part 4 Drain outlet 5 Discharge pipe 6 Water inlet 7 Communication pipe 8 Stop valve 9a, 9b, 9c Electromagnetic valve 10 Inclination sensor 11 Valve opening / closing control part

Claims (3)

It is composed of a cylindrical peripheral wall portion and a top plate portion that closes one end of the cylindrical peripheral wall portion, and is a suction structure that penetrates into the water bottom ground by discharging water in the cylindrical peripheral wall portion,
A plurality of discharge pipes piped to the cylindrical peripheral wall portion and open to an open end of the cylindrical peripheral wall portion;
A water inlet to which high-pressure water is supplied;
A communication pipe provided with a water stop valve for opening and closing a water passage, connecting the water injection port and the discharge pipe;
The plurality of discharge pipes are composed of three or more systems grouped at predetermined angles with respect to the central axis of the cylindrical peripheral wall portion,
The suction structure according to claim 1, wherein the communication pipe is provided for each of the systems.   2. The suction structure according to claim 1, wherein the openings of the plurality of discharge pipes are arranged at equal intervals at the open ends of the cylindrical peripheral wall portion.   The suction structure according to claim 2, wherein an interval between openings of the discharge pipes adjacent to each other is set shorter than a wall thickness of the cylindrical peripheral wall portion.

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