JP5329374B2 - Undulating gate breakwater - Google Patents

Description

  The present invention relates to a undulating gate type breakwater installed in a harbor as a countermeasure against storm surges, for example.

  As a conventional undulating gate type breakwater, there is one that undulates a door body by buoyancy (for example, Patent Document 1).

  In such a undulating gate type breakwater, the door body is lifted by draining seawater in the buoyancy chamber while supplying air to the buoyancy chamber provided in the door body. An air supply device for draining is necessary.

  However, in the case of the undulating gate breakwater, it is necessary to always store the compressed air in the pressure accumulating tank so that the necessary compressed air can be supplied even during a power failure. In addition, the buoyancy chamber of the retracted door body is filled with seawater and landed at the storage position due to the weight of the door body, so the pressure of the pressure accumulation tank, the overturning moment of the door body (the weight of the door body tip) ) And the inclination angle must be constantly monitored. However, even in this case, it is not possible to detect an abnormality that causes a hole in the buoyancy chamber due to corrosion or the like. Furthermore, when the weight of the door body increases due to deposits or the like, it is necessary to perform a maintenance operation such as a floating operation or a dredging.

  Also, for example, when a tsunami warning is issued in the event of an earthquake and the breakwater is raised, the air supply valve is opened and the air is supplied to the buoyancy chamber and drained from the buoyancy chamber based on the ascent command. It takes time for the breakwater to stand up, and may not be in time to block the intrusion of the tsunami.

  Therefore, the applicant has proposed a hoisting gate type breakwater in which the door body stands up by buoyancy, which is always moored while holding the door body in a state having buoyancy (Japanese Patent Application No. 2008-307699).

  In this undulating gate type breakwater mooring device, the door body is always kept in a state of buoyancy, so the door body is held downward by an expansion / contraction device that expands and contracts as the tension acting on the mooring line member increases and decreases. The door body remains in a lying state.

  In order to reduce the size of the telescopic device or improve the durability of the telescopic device, it is necessary to reduce the load necessary for mooring the door body. In order to reduce the load required for mooring the door body, it is necessary to reduce the buoyancy of the door body. However, when the buoyancy of the door body is reduced, the rising speed of the door body at the time of ascent is reduced.

JP 2003-227125 A

  The problem to be solved by the present invention is that, in the undulating gate type breakwater mooring device proposed by the applicant, the ascent speed of the door body at the time of ascent is lowered in order to reduce the load necessary for mooring the door body. That is the point.

The relief gate breakwater of the present invention is
In order to reduce the load necessary for mooring the door body without lowering the ascent speed of the door body when ascending,
A hollow box provided to connect the skin plate, a hollow cylindrical vertical girder provided at predetermined intervals in the width direction of the skin plate, a hollow cylindrical horizontal girder connecting the vertical girder, and the vertical girder The door body, in which a plurality of sets of door blocks composed of a buoyancy chamber are arranged side by side in the width direction, is moored in a state where buoyancy is obtained by supplying air to the buoyancy chamber, and the levitation operation releases the mooring In the undulating gate type breakwater,
The most important feature is that a predetermined amount of liquid is sealed inside the stringers constituting the door block.

  In the present invention, since a predetermined amount of liquid is sealed inside the stringer, the weight of the door body becomes heavy and the load necessary for mooring can be reduced. On the other hand, when the door body floats, the liquid in the stringer is It moves in the direction of the rotation fulcrum of the body and increases the floating force of the door body as a moment, and suppresses the decrease in the floating speed of the door body.

  In the present invention, the amount of liquid sealed inside the stringer is determined by the relationship with the buoyancy generated in the door body, but at least when the door body floats, the liquid in the stringer is in the direction of the rotation fulcrum of the door body. It is necessary to be able to move to.

  In the present invention, since the liquid is enclosed in the stringer to increase the weight of the door, the load necessary for mooring can be reduced, and the extension device can be downsized and the extension device can be improved in durability. On the other hand, when the door body is lifted, the liquid in the stringer moves in the direction of the rotation fulcrum of the door body and increases the floating force of the door body as a moment. Can be suppressed.

(A) is the schematic explaining the fall state at the time of storage of the undulating gate type breakwater of this invention, (b) is an enlarged view of a door body front-end | tip part. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the state which installed the undulating gate type breakwater of this invention continuously in the port entrance width, (a) is the perspective view which abbreviate | omitted the tension rod, (b) is a side view, (c) is (b) figure. FIG. It is detail drawing of a mooring mechanism, (a) is a perspective view which shows the structure by the side of a accommodating part, (b) is detailed drawing which shows the structure by the side of a control apparatus. It is the schematic explaining the state of a mooring mechanism when one side turning link member is provided with two or more. It is the figure which showed the structure of the door body block, (a) is this invention, (b) shows the former. It is a figure explaining the balance of the dead weight and buoyancy of a door body, (a) is the conventional door body, (b) is the case of the present invention which reduces the mooring force of the door body, (c) is the rising speed of the door body. This is the case of the present invention to be increased. It is the figure which showed the state which the seawater in a stringer moved to the rotating shaft direction of the door body at the time of the floating of a door body. (A) is the schematic explaining the state of the mooring mechanism when the door body is moored, (b) is an AA arrow directional view of (a). (A)-(d) is a figure explaining later the relative positional relationship of the gate mooring pin and mooring hook accompanying the fall of a door body. (A) is the schematic explaining the state of the mooring mechanism when the mooring of a door body is cancelled | released, (b) is an AA arrow line view of (a). It is a figure explaining the mooring force required when the door body is allowed to shake. It is a figure explaining the mooring force required in order to hold | maintain the lying state of a door body. (A) is explanatory drawing of the undulating gate type breakwater of this invention which provided the some weir with predetermined space | interval inside the stringer, (b) is the figure which showed the rocking | fluctuation angle of the door body. . It is explanatory drawing of the undulation gate type breakwater of this invention which attached the cylinder which enclosed appropriate amount of seawater inside to the outer side of a stringer.

  In the present invention, the purpose of reducing the load required for mooring the door body without lowering the rising speed of the door body at the time of ascent is realized by enclosing a liquid inside the stringer.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is a schematic diagram for explaining a collapsed state when the undulating gate type breakwater of the present invention is stored.

  In FIG. 1, reference numeral 1 denotes a undulating gate breakwater. For example, a door body 2 and a plurality of tension rods 3 provided outside the port of the port R so that the door body 2 does not fall over when the door body 2 floats. It is the structure provided with.

  When installing in a wide water area at the port mouth width, the door body 2 is adjacent to each other by arranging a plurality of sets of door body blocks B in parallel in the width direction at a certain interval, as shown in FIG. The door body blocks B are connected with a rope.

  For example, as shown in FIG. 2C, the door block B connects the stringers Bb provided at predetermined intervals in the width direction on the outer surface of the skin plate Ba and the stringers Bb. The buoyancy chamber Bd is provided on the top side so as to connect the horizontal beam Bc and the vertical beam Bb.

  The door body 2 is configured such that the rotation shaft 2a on the base end side is pivotally supported by a bearing 5 on a base 4a of a storage unit 4 provided integrally with the bottom of the harbor R, for example. It undulates using 2a as a fulcrum.

  Further, the tension rod 3 is formed to be bent in two at an intermediate connecting portion 3a, for example. The one end 3b located on the upper end side when the door body 2 stands is on the top side of the door body 2, and the other end 3c located on the lower end side when the door body 2 is raised is on the side on which the door body 2 falls. Each is pivotally supported at a position away from the rotation shaft 2a by a predetermined distance so as to be freely rotatable.

  Reference numeral 11 denotes a mooring mechanism for mooring the door body 2 in a state having buoyancy, for example, as shown in FIG.

  Reference numerals 12 and 13 denote bell crank-shaped turning link members. One turning link member 12 is a door in a lying state when stored as shown in FIG. 1A of the storage portion 4 for storing the door body 2 in water. It is installed in the part facing the back surface 2b of the body 2. The other turning link member 13 is installed on the outer side of the one end of the door body 2 in the storage portion 4 at a portion facing the rear surface 2b of the door body 2 in the lying state when stored.

  Reference numeral 14 denotes a torque shaft that can freely rotate around the axis center, and a gate mooring portion 2c attached to, for example, a top end side (upper end side of the door body when standing) on the back surface 2b of the door body 2 in a retracted state. It is installed in the opposite position. And the anchoring hook 15 is attached to the engagement position of this torque shaft 14 with the said gate anchoring part 2c. Reference numeral 16 denotes a counterweight that rotates the torque shaft 14 in a direction to release the engagement of the mooring hook 15 with the gate mooring portion 2c.

  The one end side is connected to the other end side of the torque arm 18 attached to one end side in the axial direction intermediate position of the torque shaft 14, and the other end side is the one turning link member 12 and the other turning link member. 13 is a rod member drawn onto the water surface through 13.

  The rod member 17 includes one vertical rod 17a, a horizontal rod 17b, and the other vertical rod 17c.

  One vertical rod 17a is provided with a long hole 17aa at one end, and a pin 18a provided at the other end of the torque arm 18 is inserted into the long hole 17aa, while the other end is one turning link. The member 12 is pivotally supported at one end portion 12a.

  Further, the horizontal rod 17b is pivotally supported at one end thereof on the other end 12b of the one turning link member 12, and the other end is pivotally supported on one end 13a of the other turning link member 13. . When one turning link member 12 is provided in a plurality, the horizontal rod 17b pivotally supports the other end portion 12b of the plurality of one turning link member 12, and the other end portion is used as the other turning link. It pivotally supports one side end 13a of the member 13 (see FIG. 4).

  The other vertical rod 17c has one end pivotally supported on the other end 13b of the other turning link member 13, and the other end is pulled out on the water surface and connected to the control device 21 having the following configuration. ing.

  Reference numeral 19 denotes an operation limiting stopper installed on the rotation locus of the one end 12 a of the one turning link member 12. When the one end 12 a of the one turning link member 12 contacts the operation limiting stopper 19. The operating range of one turning link member 12 is limited.

  Reference numeral 22 denotes a hook attaching / detaching cylinder device for attaching / detaching the mooring hook 15 to / from the gate mooring part 2c, and a pulley 23 is attached to the tip of a piston rod 22b that is withdrawn from and retracted from the cylinder 22a having a fixed bottom part.

  Reference numeral 24 denotes a wire member wound around the pulley 23, one end side of which is connected to the other end of the other vertical rod 17 c via the load cell 25, and the other end side expands and contracts as the door body 2 is shaken. A telescopic device, for example, a spring device 26 is connected. The spring used for the spring device 26 is a coil spring in which an elongated metal wire is spirally wound.

  The hook attaching / detaching cylinder device 22 is provided with a stroke sensor 22c for detecting an amount of the piston rod 22b to be retracted, and the spring device 26 is provided with a stroke sensor 26a for measuring a spring stroke and a stroke indicator. .

  In the mooring device 11 having the above-described configuration, the swing caused by the floating force generated in the door body 2 when the waves pass over the door body 2 moored in the storage unit 4 is allowed by the expansion and contraction of the spring device 26. Cancel the wave power.

  In the undulating gate type breakwater 1, the buoyancy chamber Bd constituting the door block B is formed of a hollow box, and is supplied to the buoyancy chamber Bd by an air supply device (receiver tank and compressor) (not shown). Thus, the buoyancy required for the levitation of the door body 2 is obtained. Further, the vertical beam Bb and the horizontal beam Bc are also formed of a hollow cylindrical body, and have a role of reducing the underwater weight of the door block B.

In the present invention, as shown in FIG. 5A, an appropriate amount of, for example, seawater W is sealed inside the stringer Bb. As a result, the underwater weight of the door block B (door 2) increases by the amount of seawater weight F _W, so that the amount corresponding to the lost buoyancy than in the conventional case shown in FIG. It is supplemented by an increase in capacity.

In the case of the above structure, when the door body 2 is lifted, as shown in FIG. 7, the seawater W in the stringer Bb moves in the direction of the rotation axis 2a of the door body 2 and the buoyancy F of the door body 2 as a moment _{Since B} is increased, a decrease in the flying speed of the door body 2 is suppressed.

When reducing the mooring force F _M of the door body 2 during storage, as the flying velocity of the door body 2 (buoyancy F _B) is similar to the conventional, traditional buoyancy chamber Bd shown in FIG. 6 (a) It is desirable to determine the ratio of the volume of the buoyancy chamber Bd to the volume. In this case, the balance is as shown in FIG.

Also, if it is not necessary to reduce the mooring force F _M of the door body 2 at the time of storage, as faster than before the floating speed of the door body 2, the conventional buoyancy chamber Bd shown in FIG. 6 (a) The ratio of the volume of the buoyancy chamber Bd to the volume may be determined. In this case, the balance is as shown in FIG.

  The undulating gate type breakwater 1 having the above configuration stores and stands up the door body 2 by the following operations.

(Mooring preparation operation: see FIGS. 3 and 8)
The piston rod 22b of the hook attaching / detaching cylinder device 22 is moved out, and the one end portion 12a of one turning link member 12 is brought into contact with the operation limiting stopper 19.

  Thereafter, while monitoring the stroke sensor 26a of the spring device 26 or the load cell 25, a mooring force (hereinafter referred to as a predetermined mooring force) equivalent to when a buoyancy serving as a reference when the door body 2 is moored is applied. Then, the piston rod 22b of the hook attaching / detaching cylinder device 22 is moved out, and the stroke position of the piston rod 22b of the hook attaching / detaching cylinder device 22 at that time is detected by the stroke sensor 22c and stored as a reference position.

  At this time, a link member between the operation restriction stopper 19 and the control device 21 and a set of spring devices (one turning link member 12, rod members 17b and 17c, the other turning link member 13, load cell 25, wire member 24, spring device 26) ) Is a state where a predetermined mooring force equivalent is applied and extended.

  Since the relative relationship between the postures of the one turning link member 12 and the mooring hook 15 is known, the one turning link member 12 is the operation limiting stopper in the posture of the one turning link member 12 at the stored reference position. An amount corresponding to the stroke from the position in contact with the position 19 to the position of one turning link member 12 corresponding to the position where the mooring hook 15 is in the horizontal state (a predetermined amount corresponding to the predetermined stroke), the piston of the hook attaching / detaching cylinder device 22 The rod 22b is retracted.

  In this state, when the piston rod 22b of the hook attaching / detaching cylinder device 22 is retracted by a predetermined stroke, first, the extended link member and the spring device set are contracted, and the stored reference position is set to the memorized reference position. The one end 12a of the one turning link member 12 that is positioned moves away from the operation limiting stopper 19 and retracts by an amount corresponding to a predetermined stroke, and the mooring hook 15 is equivalent to the contraction of the link member and the spring device set, The position is inclined downward from the horizontal state. This completes the mooring preparation operation.

(Mooring operation: see Fig. 7)
With the mooring preparation operation completed, the exhaust valve provided at the upper end of the door body 2 is opened, and the air in the buoyancy chamber Bd is exhausted while seawater is introduced into the buoyancy chamber Bd. Lay down.

  As the door body 2 falls down, the gate mooring part 2c provided on the door body 2 pushes down the mooring hook 15, and at the same time, the pin 18a of the torque arm 18 moves to the lower part of the long hole 17aa of one vertical rod 17a (see FIG. 9 (a) to FIG. 9 (b)).

  When the gate mooring portion 2c of the door body 2 passes through the mooring hook 15, the mooring hook 15 passes the gate mooring portion 2c by the action of the counterweight 16 and returns to a position inclined slightly downward from the horizontal state (FIG. 9 (c) )).

  After completion of lodging, compressed air is supplied into the buoyancy chamber 2b, and the seawater in the buoyancy chamber 2b is drained. Thereby, the door body 2 floats up, and the gate mooring part 2d pushes up the mooring hook 15 to transmit the buoyancy of the door body 2. At the same time, the rod member 17, the one turning link member 12, the other turning link member 13, the wire member 24, and the spring device 26 are stretched and displaced by the mooring force due to the buoyancy of the door body 2. The mooring hook 15 moves upward by the amount displaced.

  Thereafter, the stroke sensor 26a or the load cell 25 of the spring device 26 is monitored, and it is confirmed that a predetermined mooring force is acting, and the air supply to the buoyancy chamber 2b is stopped. At this time, the mooring hook 15 is in a horizontal state.

(During the floating operation of the door body 2: see FIG. 10)
By releasing the hydraulic pressure of the hook attaching / detaching cylinder device 22 and loosening the holding force, the other vertical rod 17c, the other turning link member 13, the horizontal rod 17b, the one turning link member 12, the one vertical rod 17a, The mooring force of the mooring hook 15 is loosened via the torque arm 18, and the mooring hook 15 is pushed up by the buoyancy of the door body 2 and the force of the counterweight 16, thereby releasing the engagement with the gate mooring portion 2c.

  Thereafter, it is confirmed that the spring device 26 is contracted and the load cell 25 confirms that there is no mooring force.

  In the undulating gate type breakwater 1 having the above configuration, the spring body 26 allows the door body 2 to be shaken and moored. In this case, when the door body 2 is displaced upward, the lower space S1 of the door body 2 becomes negative pressure, and a force acting downward on the door body 2 due to a pressure difference with the upper surface of the door body 2 is generated. Occurs (see FIG. 11).

  As a result, the mooring mechanism must bear all the applied load as a moment around the rotation axis 2a of the door body 2 caused by the waves (see FIG. 12), rather than the case where the door body 2 is fixed and moored. The load required to moor the body 2 is reduced.

  The present invention is not limited to the above examples, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  Since the door body 2 is moored in a state having a predetermined permissible amount of swing, when the lying door body 2 moves upward, the seawater W in the stringer Bb moves in the direction of the rotary shaft 2a and balances the weight. May be destroyed.

  Therefore, until the rocking angle θ of the door body 2 exceeds a predetermined angle, the movement of the seawater W is restricted to prevent the weight balance from being lost, as shown in FIG. A plurality of weirs Bba may be provided at predetermined intervals.

  Further, when it is necessary to install a pipe or the like inside the stringer Bb and the seawater W cannot be sealed, as shown in FIG. 14, the cylinder C in which an appropriate amount of seawater W is sealed is placed outside the stringer Bb. It may be attached to.

  Also in the undulating gate type breakwater 1 shown in FIG. 14, when a plurality of weirs are provided in the cylinder C with a predetermined interval, the swing angle θ of the door body 2 has a predetermined angle. Until it exceeds, the movement of the seawater W can be restricted to prevent the weight balance from being lost.

  In the case of the other embodiments described above, the weight of the weir bba and the cylinder C is considered to be included in the weight of the door body 2. Further, the portion excluding the seawater W enclosed in the cylinder C is considered to be included in the buoyancy of the door body 2.

  In addition, the mooring mechanism 11 constituting the undulating gate type breakwater 1 of the present invention is not limited to the above embodiment, but may be a mooring device constituting the undulating gate type breakwater proposed in Japanese Patent Application No. 2008-307699.

B Door body block Ba Skin plate Bb Vertical girder Bc Horizontal girder Bd Buoyancy chamber 1 Relief gate type breakwater 2 Door body 2a Rotating shaft 2b Back surface 2c Gate mooring part 4 Storage part 5 Bearing 11 Mooring mechanism

Claims (4)

A hollow box provided to connect the skin plate, a hollow cylindrical vertical girder provided at predetermined intervals in the width direction of the skin plate, a hollow cylindrical horizontal girder connecting the vertical girder, and the vertical girder The door body, which is formed by arranging a plurality of sets of door blocks composed of a buoyancy chamber in the width direction, is moored in a state where buoyancy is obtained by supplying air to the buoyancy chamber, and the standing operation releases the mooring. In the undulating gate type breakwater,
A undulating gate type breakwater characterized in that a predetermined amount of liquid is sealed inside a stringer constituting the door block.   The undulating gate type breakwater according to claim 1, wherein a plurality of weirs are provided inside the stringer with a predetermined interval.   2. The undulating gate system according to claim 1, wherein instead of enclosing a predetermined amount of liquid inside the stringer, a cylinder having a predetermined amount of liquid enclosed therein is attached to the outside of the stringer. breakwater.   The undulating gate type breakwater according to claim 3, wherein a plurality of weirs are provided inside the cylinder with a predetermined interval.

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