JP6038520B2 - Oscillating breakwater retaining belt and manufacturing method thereof - Google Patents

Description

  The present invention relates to an oscillating breakwater retaining belt and a method of manufacturing the same.

  Conventionally, a foundation having an oscillating support portion (hinge) that can oscillate in the horizontal axis is provided on the seabed at a point where tsunami progression is to be prevented. And the tsunami breakwater which arrange | positions the water stop board (door body) provided with the rocking | fluctuation support part (hinge) which functions by combining with the rocking | fluctuation support part on this foundation by setting the side with a rocking | fluctuation support part as a land side. (See Patent Document 1).

  In the tsunami breakwater disclosed in Patent Document 1, the waterstop plate falls near the seabed in normal times, and when the tsunami arrives, the waterstop plate stands up automatically by the wave force of the tsunami.

  However, since the water stop plate is supported by the swing support portion (hinge) so as to be raised and lowered, there is a problem that the hinge structure is complicated and the number of parts increases.

  Moreover, in order to make it easy for the tsunami water flow to flow below the water stop plate at the time of lodging, it is necessary to maintain the elevation angle of the water stop plate by the base side protrusion for starting the water stop plate. In order to omit this foundation side protrusion, a technique is disclosed in which a gap is formed on the lower surface of the water stop plate to facilitate the flow of the tsunami water flow below the water stop plate. There is a problem that can only deal with.

  Furthermore, in order to stabilize the standing water plate when standing, a water rope standing posture holding mechanism using a wire rope, chain or link is provided, but in order to reduce the load on the wire rope, the wire rope There is a problem that it is necessary to provide shock absorbers corresponding to the number of the above.

  Here, the wire rope connects the end point provided on the wave receiving surface of the water stop plate and the end point provided on the seabed when standing up, but directly receives the strong tsunami wave force when the water stop plate stands up. Since it is a part, the connecting structure of each end point must be extremely strong in practice. In addition, since the wire rope is corroded and scratched, it is necessary to periodically replace it with a new one. Therefore, it is necessary to be able to be easily replaced by a diver underwater while maintaining a strong connection structure.

  In order to solve the above-mentioned problems, the applicant of the present application eliminates the need for a hinge fitting of the door body (gate) (hingeless type), makes a simple support structure with a small number of parts, and also applies to push waves. A rocking breakwater (undulation-type breakwater device) that can handle pulling waves has been proposed (Patent Document 2).

  As shown in FIGS. 26A and 26B, such a rocking breakwater is generally located with respect to a lying position D that falls in a substantially parallel state with respect to the water bottom 2 that is a substantially horizontal flat surface, and to the water bottom 2. The door body 1 is provided so as to be swingable to a standing position U1 (see FIGS. 27 (a) and (b)) and U2 (see FIGS. 28 (a) and (b)) rising up in a vertical state. 27 (a) and 27 (b), for example, the door 1 is a huge structure having a lateral width W1 of about 60 m and a standing height H1 of about 20 m. It is installed on the sea floor of about 15m.

  In the door body 1, one end portion 1 a that receives wave force in the pushing wave direction a and the other end portion 1 b that receives wave force in the pulling wave direction b are set above the water bottom surface 2, respectively. , 1b and the lower surface 1d contacting the water bottom surface 2 are formed in a substantially arcuate shape or a trapezoidal shape downward in a side view. In addition, in each figure, the upper surface 1c is also formed in the upward substantially arcuate shape or the substantially trapezoidal shape in a side view (a leaf shape in a side view).

  Further, one end 4a is connected to the water bottom 2 in the push wave direction a, and the other end 4b is connected to the vicinity of the other end 1b of the door body 1 to support the other end 1b of the door body 1 so as to be swingable. A first fixing belt 4 is provided.

  Further, one end 5a is connected to the bottom surface 2 in the wave pulling direction b, and the other end 5b is connected to the vicinity of the one end 1a of the door body 1 to support the one end 1a of the door body 1 so as to be swingable. The fixed belt 5 is provided.

  Further, the first retaining belt 6 that holds the door body 1 in the standing position U1 against the wave force in the pushing wave direction a and the door body 1 in the standing position U2 against the wave force in the wave direction b. A second retaining belt 7 is provided.

  Here, if the lateral width W1 of the door body 1 is about 60 m and the height T1 is about 20 m, each of the retaining belts 6 and 7 has a length of about 40 m, a width of about 3 m, and a thickness. Is about 12 to 15 cm, and the weight per one is about 1 t (ton). And when receiving strong wave force like a tsunami, it is estimated that the length of the retaining belts 6 and 7 is extended by about 1 to 3 m.

  According to this swing type breakwater, the door body 1 (gate) is in the normal position of FIGS. 26 (a) and 26 (b), and the fall position D of the water bottom surface 2 (for example, about 0 degrees with respect to the water bottom surface, and so on). Will not affect the navigation of the ship.

  When a push wave is generated by a tsunami, storm surge, secondary vibration, etc., the wave force in the push wave direction a is between the one end 1a of the door body 1 and the bottom surface 2 as shown in FIGS. Flows into the gap (elevation angle) f [see FIG. 26 (b)], an upward couple is generated at one end 1a of the door 1 and a downward couple at the other end 1b.

  At this time, since the lower surface 1d of the door body 1 is substantially arcuate, the fulcrum and the center of gravity of the door body 1 gradually move in the direction of the other end portion 1b from the fall position D of the two-dot chain line. It naturally rises up to a predetermined standing angle (for example, about 30 degrees) while rolling on the water bottom 2. When the fulcrum and the center of gravity move to the other end portion 1b, the other end portion 1b is connected to the first fixing belt 4, so that the door body 1 rotates around the other end portion 1b ( (See arrow Q). That is, the door body 1 rotates to the standing position (for example, about 90 degrees) U1 after rolling from the lying position D to a predetermined angle. Further, the door body 1 is held at the standing position U <b> 1 against the wave force in the pushing wave direction a by the first retaining belt 6. As a result, the push wave is suppressed by the door body 11 at the standing position U1.

  On the other hand, when the push wave ends and a pulling wave is generated, the door body 1 falls to the lying position D on the bottom surface 2 as shown in FIGS. Then, the wave force in the pulling direction b flows into the gap (elevation angle) f between the other end 1b of the door body 1 and the water bottom surface 2 so that the other end 1b of the door body 1 faces upward, A downward couple is generated in the portion 1a.

  At this time, since the lower surface 1d of the door body 1 is substantially arcuate, the fulcrum and the center of gravity of the door body 1 gradually move in the direction of the one end 1a from the fall position D of the two-dot chain line, so that the lower surface 1d It naturally rises up to a predetermined standing angle (for example, about 30 degrees) while rolling on the bottom surface 2. When the fulcrum and the center of gravity move to the one end 1a, the one end 1a is connected to the second fixing belt 5, so that the door body 1 rotates around the one end 1a (see arrow R). ). That is, the door body 1 rotates to the standing position (for example, about 90 degrees) U2 after rolling from the lying position D to a predetermined angle. Further, the door body 1 is held at the standing position U2 against the wave force in the pulling wave direction b by the second retaining belt 7. As a result, the pulling wave is suppressed by the door body 1 at the standing position U2.

  If such a oscillating breakwater is installed at the entrance (waterway) partitioned by a fixed breakwater at the port, it is possible to prevent the tide level in the port from abruptly rising due to the tsunami and other waves, An effect such as being able to suppress a sudden drop in the tide level in the harbor can be achieved.

  In addition, although it differs from the huge rocking breakwater like patent document 2, as shown in FIG. 29, at the bottom 40a of the water channel 40, between the standing position U on the upstream side and the lying position D on the downstream side. A door body 41 clamped to be rotatable and a bag body 42 installed on the downstream side of the door body 41 are provided, and the door body 41 is rotated in the standing direction by the expansion of the bag body 42 by the supply of fluid. There is a raising / lowering gate that is moved and the door body 41 is rotated in the lying down direction by contraction of the bag body 42 by discharging the fluid (Patent Document 3).

  In such an undulating gate, the lateral width of the door body 41 is about 1 to 50 m (when the width exceeds 10 m, door bodies having a lateral width of about 10 m are arranged side by side for the necessary lateral width). The height at the time of standing is about 1.5 m, and it is for controlling the water level on the upstream side, so it is not expected to receive a strong wave force like a tsunami.

  Even in this undulating gate, the retaining belt 43 is provided, but only restricts the door body 41 that rotates in the standing direction by the expansion of the bag body 42 to the maximum standing position.

JP 2006-342653 A JP 2010-265618 A JP 2005-76277 A

  Here, in the oscillating breakwater as in Patent Document 2, the retaining belts 6 and 7 have a tensile strength that can sufficiently withstand even when the door body 1 is directly subjected to a strong tsunami wave force. When the length is about 40 m, the width is about 3 m, the thickness is about 12 to 15 cm, the weight per one is about 1 t (tons), and each of the four retaining belts 6 and 7 is used. Needs 60,000 KN).

  In addition, the retaining belts 6 and 7 are not damaged even when floating objects (sharp items such as the bow of a floating ship or a screw) come into contact with the retaining belt when retaining due to a push wave or a pulling wave when a tsunami strikes. Need to be cut resistant.

  Furthermore, the retaining belts 6 and 7 need to be flexible enough to be bent in a substantially U-shape so that when the door body 1 falls down, the retaining belts 6 and 7 are submerged in the vicinity of the seabed and do not float on the sea surface.

  Further, the retaining belts 6 and 7 need to be light in weight so as not to prevent the door body 1 from standing.

  As described above, the retaining belts 6 and 7 of the rocking breakwater need to satisfy various demands such as tensile strength, cut resistance, flexibility, and light weight.

  The present invention has been made in order to meet the above-mentioned demands, and provides a retaining belt for a swing type breakwater devised to satisfy tensile strength, flexibility, cut resistance, light weight, and the like, and a method for manufacturing the same. It is intended.

In order to solve the above-mentioned problems, the present invention can swing between a lying position that falls in a substantially parallel state with respect to a water bottom member installed on the water bottom and a standing position that rises in a substantially vertical state with respect to the water bottom member. In the lying position, one end that receives the wave force in the pushing wave direction and the other end that receives the wave force in the pulling wave direction are respectively set above the water bottom member, and the water bottom member Between the lower surface and the lower surface in contact with the door body formed in a substantially arcuate or substantially trapezoidal shape downward in a side view, and one end connected to the water bottom member in the push wave direction, and the other end of the door body One end is connected to the first fixing belt connected to the vicinity of the end portion so as to swing the other end portion of the door body, and the water bottom member in the pulling direction, and the other end is one end of the door body. Connected to the vicinity of the first portion, and supports one end portion of the door body to be swingable. One end of the fixed belt and the water bottom member in the direction of the push wave are connected to each other, and the other end is connected to the vicinity of the one end of the door body. One end is connected to the first retaining belt to be held and the water bottom member in the wave direction, and the other end is connected to the vicinity of the other end portion of the door body to resist the wave force in the wave direction. a said anchoring belt swinging breakwater with a second anchoring belt to hold the upright position to, which the Tension layer and cut resistance layer and the closed cell foam rubber layer are laminated,
The tension layer has a laminated structure in which a plurality of synthetic fiber cords are arranged in a width direction in a rubber layer and are interdigital or net-like reinforcing structures extending in the length direction, and a plurality of layers are laminated. The cut-resistant layer is a reinforcing structure in which a plurality of steel cords are diagonally arranged in the length direction in the rubber layer and extended in the width direction. with a laminated structure of at least two layers are stacked, a biasing structure which steel cords of adjacent layers cross each other at a bias angle of 10 to 30 degrees, there is responsible for protection of the tension layer, the The closed-cell foamed rubber layer is a rubber layer in which independent bubbles are contained substantially across the entire surface, and is interposed between the tension layer and the cut-resistant layer. Layer Wave side facing, and is also the cut resistance layer of the second anchoring belts that are arranged so as to be undertow side orientation.

According to a second aspect of the present invention, the tension belt tension layer is formed in an endless shape, and one end and the other end are joined in a stacked manner, and fixed to the hollow portion of the folded portion at the one end and the other end. The shaft may be inserted in a penetrating state and formed at a shaft-shaped end portion, and the shaft-shaped end portion may be connected to a clamp member fixed to the water bottom member and the door body.

According to a third aspect of the present invention, the retaining belt may have a configuration in which a folding fold that is bent in a substantially U shape is attached at the fall position of the door body.

  According to the present invention, the door body does not affect the navigation of the ship and the like because it normally falls to the lying position of the water bottom member. The retaining belt is bent in a substantially U shape and is sinking near the seabed.

  When a push wave is generated by a tsunami, storm surge, secondary vibration, etc., the door body rotates to the standing position by the wave force of the push wave and stands up against the wave force in the push wave direction by the first retaining belt. As a result of being held in the position, the push wave is suppressed by the door body in the standing position.

  On the other hand, when the push wave ends and then the pulling wave is generated, the door body is rotated to the standing position by the wave force of the pulling wave, and the second retaining belt resists the wave force in the pulling wave direction to the standing position. As a result, the pulling wave is suppressed by the door body in the standing position.

  If the swing breakwater is installed at the entrance (waterway) partitioned by the harbor breakwater in this way, it is possible to suppress the tide level in the port from rising rapidly due to the push wave, and the tide level in the port due to the pulling wave An effect such as being able to suppress the lowering can be achieved.

Here, the retaining belt is formed by laminating a tension layer and a cut-resistant layer.
The tension layer has a comb-like or net-like reinforcing structure in which a plurality of synthetic fiber cords are arranged in the width direction in the rubber layer and extend in the length direction, and a plurality of layers (for example, 15 to 25 layers) Is a laminated structure in which the layers have a tensile force in the length direction.

  Therefore, when the door body is erected, the tension belt can obtain a tensile strength (for example, 60,000 KN per belt) that can sufficiently withstand the force of a strong tsunami.

  The cut-resistant layer has a laminated structure in which a plurality of steel cords are obliquely arranged in the length direction in the rubber layer and extended in the width direction, and has a laminated structure in which at least two layers are laminated. This is a bias structure in which steel cords of matching layers cross each other at a bias angle of 10 to 30 degrees, and is responsible for protection of the tension layer.

  Therefore, the retaining belt is cut-resistant so that it will not be damaged even if a suspended object (sharp material such as the bow of a floating ship or a screw) comes into contact with the retaining belt when it is retained by a push wave or a pulling wave when a tsunami strikes. Sex can be obtained.

  In addition, the retention belt combines a flexible synthetic fiber cord that extends in the length direction with a steel cord with a bias structure, so that when the door body falls down, it will not sink to the sea floor and float on the sea surface. Therefore, the flexibility to be bent in a substantially U shape can be obtained.

  Further, the retaining belt is basically made of rubber reinforced with a synthetic fiber cord and a steel cord. Therefore, the weight in water can be reduced so as not to prevent the door body from being raised.

  In addition, since the retaining belt is made of reinforced rubber, when it receives a strong wave force such as a tsunami, its length increases by about 1 to 3 m. In the wire rope which is a holding mechanism, it is not necessary to provide a necessary shock absorber. Moreover, unlike steel wire ropes and chains, there is no risk of rusting even when immersed in seawater for a long period of time.

  As described above, the tension belt, the flexibility, the cut resistance, the light weight and the like can be satisfied by the retaining belt of the rocking breakwater.

In addition , by interposing the closed cell foam rubber layer, the specific gravity of the retaining belt can be adjusted to about 1.02 to 1.05, so the weight in water is further reduced so as not to prevent the door body from standing up. become able to.

According to the second aspect , the shaft-shaped end portion is formed in the tension layer of the retaining belt, and the shaft-shaped end portion is connected to the clamp member fixed to the water bottom member and the door body, respectively. And the other end can be easily and reliably connected.

According to the third aspect , by attaching the crease to the retaining belt, it becomes difficult for the retaining belt to float near the sea surface due to a tide or the like, and therefore, it becomes difficult to obstruct the route.

It is the rocking | fluctuation type breakwater of embodiment of this invention, (a) is a top view at normal time, (b) is a side view. It is a rocking | fluctuation type breakwater of embodiment of this invention, (a) is a top view at the time of pushing wave, (b) is a side view. It is the rocking | fluctuation type breakwater of embodiment of this invention, (a) is a top view at the time of a wave-drawing, (b) is a side view. It is a normal perspective view of the rocking breakwater corresponding to FIG. It is a perspective view at the time of the pushing wave of the rocking | swiveling breakwater corresponding to FIG.2 (b). It is a perspective view at the time of the pulling of the rocking breakwater corresponding to FIG.3 (b). It is a disassembled perspective view of a door body and a water bottom member. FIG. 2 is a retention belt according to the first embodiment, where (a) is a perspective view, (b) is a front sectional view, and (c) is a front sectional view of one tension layer. It is a retention belt of 2nd Embodiment, (a) is a perspective view, (b) is front sectional drawing. (A)-(c) is explanatory drawing which shows the example of an arrangement | sequence of the synthetic fiber cord of a tension layer. (A) is a top view of the door body which stood up at the time of a push wave, (b) is the front view seen from the land side of (a). It is a door body that employs the first clamp member of the fastening belt connecting structure, (a) is a side view of the standing position at the time of pushing wave, (b) is a side view of the standing position at the time of pulling wave, (c) is It is a side view of a lying position. It is a door body adopting the second clamp member of the connection structure of the retaining belt, (a) is a side view of the standing position at the time of pushing wave, (b) is a side view of the standing position at the time of pulling wave, (c) is It is a side view of a lying position. It is a 2nd clamp member, (a) is a perspective view when a clamp part is open, (b) is a side view when a clamp part is open. It is a 2nd clamp member, (a) is a front view when a clamp part is open, (b) is a top view when a clamp part is open. FIG. 2A is a perspective view when the clamp portion is closed, FIG. 2B is a side view when the clamp portion is closed, and FIG. 2C is an enlarged cross-sectional view of a main portion of FIG. It is a 2nd clamp member, (a) is a front view when a clamp part is closed, (b) is a top view when a clamp part is closed. It is a 1st clamp member, (a) is a top view when a clamp part is closed, (b) is a side view of (a). It is a principal part enlarged view of Fig.18 (a). It is a 1st clamp member with a return axis | shaft, (a) is a top view when a clamp part is closed, (b) is a side view of (a). It is a principal part enlarged view of Fig.20 (a). It is a 2nd clamp member, (a) is side surface sectional drawing at the time of a clamp part being closed, (b) is a principal part enlarged view of (a). It is the 2nd clamp member of a door body, (a) is side surface sectional drawing, (b) is the principal part enlarged view of (a), (c) is side surface sectional drawing of a modification. (A)-(c) is a side view of the manufacturing method of a retention belt. (A) is a side view of a method of attaching a crease that is folded in a substantially U shape so that the cut-resistant layer side is inward, and (b) is a substantially U-shape in the retaining belt so that the tension layer side is inward. It is a side view of the method of attaching the crease | fold which bends. It is a rocking | fluctuation type breakwater of patent document 2, (a) is a top view at normal time, (b) is a side view. It is a rocking | fluctuation type breakwater of patent document 2, (a) is a top view at the time of pushing wave, (b) is a side view. It is a rocking | fluctuation type breakwater of patent document 2, (a) is a top view at the time of a drawing wave, (b) is a side view. It is a side view of the relief gate of patent document 3.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. Note that parts having the same configurations and functions as those in FIGS. 26 to 28 of Patent Document 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  1 to 3 and 4 to 6 are oscillating breakwaters according to the present invention. FIG. 1A is a plan view in a normal state (when there is no pushing wave or pulling wave), FIG. 1B is a side view, and FIG. 4 is a perspective view in a normal state corresponding to FIG.

  2A is a plan view at the time of pushing waves, FIG. 2B is a side view, and FIG. 5 is a perspective view at the time of pushing waves corresponding to FIG. 2B.

  FIG. 3A is a plan view at the time of drawing, FIG. 6B is a side view, and FIG. 6 is a perspective view at the time of drawing corresponding to FIG.

  As shown in FIGS. 1 and 4, the door body 11 is installed at the upper part of the water bottom member 12 installed at the water bottom 33 such as an entrance / exit (water channel) 31 or a river estuary partitioned by the fixed breakwater 30 of the harbor. .

  Referring to FIG. 7, the door body 11 has a substantially rectangular shape extending in the width direction such as the entrance 31 in a plan view. When the width of the entrance / exit 31 or the like is wide, as shown in FIGS. 4 to 6, a plurality of units (in a side-by-side manner through the partition plate 14 (see FIGS. 3 and 4)) can be covered so In this example, three units) are arranged. In practice, for example, the door body 11 has a lateral width W1 of about 60 m, a height T1 of about 20 m, and a substantially arc-shaped maximum thickness J1 described later of about 1.2 m.

  The door body 11 falls down in a substantially parallel state with respect to the water bottom member 12 (see FIG. 1B), and standing positions U1 and U2 that rise in a substantially vertical state with respect to the water bottom member 12 (see FIG. 2B). ), See FIG. 3B].

  The door body 11 has an end portion 11a that receives wave force in the pushing wave direction a and an other end portion 11b that receives wave force in the pulling wave direction b above the water bottom member 12 at the normal lying position D, respectively. Is set to A space between at least the end portions 11a and 11b and the lower surface 11d contacting the water bottom member 12 is formed in a substantially arc shape in a side view. Specifically, the lower surface 11d between the one end portion 11a and the other end portion 11b is formed in a substantially arc shape downward in a side view, and the upper surface 11c is formed in a flat shape (substantially crescent shape).

  The door body 11 is formed into a hollow shape by combining upper and lower surfaces 11c, 11d and both side surfaces 11e, 11f such as stainless steel plates and welded, and an appropriate amount of liquid is filled in the hollow portion. Thereby, since buoyancy does not arise in the door body 11, it becomes possible to install in the upper position of the water bottom member 12 in the fall position D. It is also possible to fill a solid (iron lump etc.) instead of the liquid.

  Referring to FIG. 7, the water bottom member 12 is welded in combination with the upper surface 12a such as a stainless steel plate and a steel material that serves as a column portion or a beam portion for supporting the upper surface 12a. is set up. Specifically, as shown in FIG. 4, the water bottom member 12 is installed on the bottom of the recess 33 a formed in the water bottom 33, and the door body 11 installed on the top of the water bottom member 12 is the door body 11 in the lying position D. The upper surface 11c is set so as not to protrude greatly above the water bottom 33 so as not to hinder the navigation of the ship 34 or the like.

  An upper surface 12a facing the lower surface 11d of the door body 11 in the water bottom member 12 is formed in a substantially arc shape upward in a side view. The substantially arcuate maximum thickness J2 is about 1.2 m, like the lower surface 11d of the door body 11.

  That is, with respect to the horizontal plane K shown in FIG. 1B, the lower surface 11d of the door body 11 and the upper surface 12a of the water bottom member 12 are formed in a substantially arcuate shape that is substantially line symmetric and downward and upward. Become.

  Thereby, a wave between one end (or the other end 11b) 11a of the door 11 and the horizontal plane K is provided between the lower surface 11d of each end 11a, 11b of the door 11 and the upper surface 12a of the water bottom member 12. In addition to the gap (elevation angle) f for the force to flow in, a gap (elevation angle) f for the wave force to flow in is naturally formed between the horizontal plane K and the upper surface 12a of the water bottom member 12. become.

  The door body 11 is provided with a plurality of flexible first fixing belts 4 (two in this example at a predetermined interval in the width direction). One end 4 a of the first fixed belt 4 is connected to the water bottom member 12 in the push wave direction a, extends along the lower surface 11 d of the door body 11, and the other end 4 b is the other end portion 11 b of the door body 11. It is connected to. In addition, if the connection structure with respect to the water bottom member 12 and the door body 11 of the 1st fixing belt 4 is the same structure as the fastening belt 6 (7) mentioned later, the same clamp as the fastening belt 6 (7) will be used. The member 15 (described later) can be used.

  The first fixing belt 4 supports the other end portion 11b of the door body 11 so as to be swingable. The first fixing belt 4 is rotated rightward after the door body 11 rolls in the right direction from the lying position D (see FIG. 2B), and is pushed with the other end 11b in contact with the water bottom member 12 as a fulcrum. The length is such that it rises to the standing position U1 in the wave direction a.

  A flexible first retaining belt 6 is provided at the same position as each first fixing belt 4 (can be shifted in the width direction). The first retaining belt 6 has one end 6a connected to the water bottom member 12 in the push wave direction a, extends in a substantially U shape (loop shape) in the opposite direction to the push wave direction a, and the other end 6b has the other end 6b. The door body 11 is connected to one end portion 11a. The connection structure between the one end 6a and the other end 6b of the first retaining belt 6 will be described in detail later.

  When the first retaining belt 6 rolls clockwise Q after the door body 11 rolls in the right direction from the lying position D and rises to the standing position U1 in the pushing wave direction a by the first fixed belt 4, the door body 11 11 is set to such a length as to hold the standing position U1 against the wave force in the pushing wave direction a.

  Although one end 4a of the first fixing belt 4 and one end 6a of the first retaining belt 6 are connected to the water bottom member 12, they can be connected to an anchor block installed on the water bottom 33. The same applies to one end 5a of the second fixing belt 5 and one end 7a of the second retaining belt 7 described below.

  A plurality of flexible second fixing belts 5 (in this example, two at a predetermined interval in the width direction) are provided to the door body 11 so as not to overlap the first fixing belt 4. The second fixing belt 5 is provided with one end 5 a connected to the water bottom member 12 in the wave pulling direction b, extending along the lower surface 11 d of the door body 11, and the other end 5 b being one end of the door body 11. It is connected to the part 11a. The connection structure of the second fixing belt 5 to the water bottom member 12 and the door body 11 is the same clamp as that of the retaining belt 6 (7) if the fixing belt 5 has the same structure as the retaining belt 6 (7) described later. The member 15 (described later) can be used.

  The 2nd fixed belt 5 comes to support the one end part 11a of the door body 11 so that rocking | fluctuation is possible. The second fixing belt 5 rotates left (see FIG. 3B) after the door body 11 rolls leftward from the lying position D (see FIG. 3B), and pulls the wave with the one end 11a in contact with the water bottom member 12 as a fulcrum. The length is such that it rises to the standing position U2 in the direction b.

  A flexible second retaining belt 7 is provided at the same position as each of the second fixing belts 5 (can be shifted in the width direction). The second retaining belt 7 has one end 7a connected to the water bottom member 12 in the wave drawing direction b, extends in a substantially U shape (loop shape) in the opposite direction to the wave drawing direction b, and the other end 7b The door 11 is connected to the other end 11b. The connection structure between the one end 7a and the other end 7b of the second retaining belt 7 will be described in detail later.

  The second retaining belt 7 rotates left [see FIG. 3 (b)] after the door 11 rolls leftward from the lying position D (see FIG. 3B), and the standing position in the pulling wave direction b by the second fixing belt 5. The length of the door 11 is such that the door 11 is held in the standing position U2 against the wave force in the pulling direction b when it gets up at U2.

  In this embodiment, each of the first retaining belt 6 and the second retaining belt 7 is used to a minimum. However, a strong tsunami wave force acts on the retaining belts 6 and 7. Depending on the situation, it is possible to increase the number of the retaining belts 6 and 7 to about 3 to 6, respectively.

  Each belt 4-7 is made of flexible rubber reinforced with synthetic fiber material or steel material. Specifically, referring to FIGS. 11A and 11B, the retaining belt 6 (7) is formed by laminating a tension layer 6c on one side and a cut-resistant layer 6d on the other side.

  Hereinafter, a specific structure of each of the retaining belts 6 and 7 will be described. Since the structures of the retaining belts 6 and 7 are the same, only the structure of the retaining belt 6 will be described below.

  Here, if the lateral width W1 of the door body 1 is about 60 m and the height T1 is about 20 m, the retaining belt 6 has a length of about 40 m, a width of about 3 m, and a thickness of about 12 m. About 15 cm, and the weight per one is about 1 t (ton). Moreover, when receiving a strong wave force such as a tsunami, the length of the retaining belt is estimated to be extended by about 1 to 3 m.

  FIG. 8 shows the retaining belt 6 of the first embodiment, where (a) is a perspective view, (b) is a front sectional view, and (c) is a front sectional view of one tension layer 6c.

  As shown in FIGS. 8A and 8B, the tension belt 6 is formed by laminating a tension layer 6c and a cut-resistant layer 6d.

  The tension layer 6c is a comb-shaped reinforcing structure in which a plurality of synthetic fiber cords 27 are arranged in the width direction in a rubber (for example, pro-prene rubber) layer and extend in the length direction. It is a laminated structure that is laminated, and is responsible for the tensile force in the length direction. In addition, if the rubber layer is a proloprene rubber, its specific gravity is about 1.2.

  Specifically, as shown in FIG. 8C, the tension layer 6c is, for example, a synthetic fiber cord (for example, polyamide synthetic fiber) having a diameter d1 of about 2 mm in a rubber layer having a thickness t1 of about 3.3 mm. 27 are arranged in the width direction at a pitch of about 2 mm p1. Therefore, if the width of the tension layer 6c is about 3 m, about 1500 synthetic fiber cords per sheet are arranged in the width direction. If the synthetic fiber cord is a polyamide synthetic fiber [for example, nylon (trade name)], the specific gravity is about 1.05.

  The synthetic fiber cords 27 are not limited to those arranged in a row in the width direction, but are arranged in upper and lower multi-stages (two stages in this example) as shown in FIG. 10 (a), and vertically as shown in FIG. 10 (b). It may be arranged in a staggered manner in multiple stages (two stages in this example).

  Further, the tension layer 6c may have a net-like supply structure as shown in FIG. 10C in addition to the interdigital supply structure made of the synthetic fiber cord 27.

  As shown in FIGS. 8A and 8B, when the tension layers 6c are laminated in 18 layers, for example, the total thickness t2 is about 60 mm.

  The cut-resistant layer 6d is a reinforcing structure in which a plurality of steel cords 28 are arranged obliquely in the length direction in a rubber (for example, proloprene rubber) layer and extended in the width direction, and a laminated structure in which at least two layers are laminated. In addition, the steel cords 28 of adjacent layers cross each other at a bias angle of 10 to 30 degrees, and are responsible for protecting the tension layer 6c.

  Specifically, as shown in FIGS. 8A and 8B, the cut-resistant layer 6d is, for example, a steel cord (eg, stainless steel cord) having a diameter d2 of about 8 mm in one rubber layer having a thickness of about 30 mm and a thickness t3. Are arranged obliquely in the length direction at a pitch of about 32 mm. Therefore, if the width of the cut-resistant layer 6d is about 3 m, about 93 steel cords per sheet are arranged obliquely in the length direction. If the steel cord is stainless steel, the specific gravity is about 7.8.

  If the cut-resistant layer 6d is laminated in two layers, for example, the total thickness t4 is about 60 mm.

  In this example, the total thickness t2 of the tension layer 6c is about 60 mm, the total thickness t4 of the two layers of the cut-resistant layer 6d is about 60 mm, and the total thickness t5 is about 120 mm (about 12 cm) in total.

  FIG. 9 shows the retaining belt 6 according to the second embodiment, wherein (a) is a perspective view and (b) is a front sectional view.

  The difference from the first embodiment is that a closed-cell foamed rubber layer 6f that adjusts the specific gravity of the retaining belt 6 is interposed between the tension layer 6c and the cut-resistant layer 6d.

  The closed-cell foamed rubber layer 6f is a rubber layer in which an infinite number of independent bubbles having a diameter of about 0.5 to 2 mm are encapsulated over almost the whole, and the specific gravity is about 0.25. . The specific gravity of the retaining belt 6 can be adjusted to about 1.02 to 1.05 by adjusting the number of bubbles in the closed-cell foamed rubber layer 6f.

  With the interposition of the closed cell foam rubber layer 6f, for example, one cut-resistant layer 6d is about 20 mm thick t6, and if the cut-resistant layers 6d are laminated in two layers, for example, the total thickness is about 40 mm.

  Then, by interposing, for example, a closed cell foam rubber layer 6f of about 20 mm thickness t7 between the tension layer 6c and the cut resistant layer 6d, the total thickness of the cut resistant layer 6d is about 40 mm and the closed cell foamed rubber. The thickness t7 of the layer 6f is 20 mm, and the total thickness t8 is 60 mm. Since the total thickness t2 of the tension layer 6c is about 60 mm, the total thickness t5 is about 120 mm (about 12 cm) in total.

  When the one end 6a and the other end 6b are connected to clamp members 15A, 15A ′, 15B, which will be described later, the tension layer 6c of the retaining belt 6 is formed in an endless (loop) shape with reference to FIG. 6a and the other end 6b are joined together in two layers, and the fixed shaft 16 is inserted through the hollow portion of the folded portion of the one end 6a and the other end 6b in a penetrating state, so that a circular shaft-shaped end is seen in a side view It is formed in the part 6e.

  In the case of the swing type breakwater configured as described above, the door body 11 is normally in the fall position D of the water bottom member 12 (for example, about 0 degree with respect to the water bottom member 12, as shown in FIG. 1 or FIG. 4). Similarly, it does not affect the navigation of the ship 34. Further, the retaining belts 6 and 7 are bent outward in a substantially U-shape (loop shape) and are sinking near the seabed.

  Then, as shown in FIG. 2 or FIG. 5, when a push wave is generated by a tsunami, storm surge, secondary vibration, etc., the door body 11 rotates to the standing position U1 by the wave force of the push wave, and the first retaining belt 6 As a result of being held at the standing position U1 against the wave force in the pushing wave direction a, the pushing wave is suppressed by the door body 11 at the standing position U1.

  On the other hand, as shown in FIG. 3 or FIG. 6, when the pushing wave ends and then the pulling wave is generated, the door body 11 rotates to the standing position U <b> 2 by the wave force of the pulling wave and is pulled by the second retaining belt 7. As a result of being held at the standing position U2 against the wave force in the wave direction b, the pulling wave is suppressed by the door body 11 at the standing position U2.

  In this way, if the oscillating breakwater is installed at the entrance (water channel) 31 partitioned by the fixed breakwater 30 of the port, it is possible to suppress a sudden rise in the tide level in the port due to the push wave, It becomes possible to suppress the tide level from dropping sharply.

  Here, the fastening belts 6 and 7 are formed by laminating a tension layer 6c on the inner surface side (door body side) and a cut-resistant layer 6d on the outer surface side.

  The tension layer 6c has a comb-shaped reinforcing structure in which a plurality of synthetic fiber cords 27 are arranged in the width direction in the rubber layer and extend in the length direction, and 15 to 25 layers are laminated. It is a laminated structure and is responsible for the tensile force in the length direction.

  Therefore, the retaining belts 6 and 7 can have a tensile strength (for example, 60,000 KN per one) that can sufficiently withstand the tsunami wave force directly when the door body 11 stands. become.

  The cut-resistant layer 6d has a laminated structure in which a plurality of steel cords 28 are obliquely arranged in the length direction in the rubber layer and are extended in the width direction, and at least two layers are laminated. A bias structure in which the steel cords 28 of adjacent layers cross each other at a bias angle of 10 to 30 degrees and is responsible for protecting the tension layer 6c.

  Therefore, when the retaining belts 6 and 7 are retained by the push wave a or the attracting wave b when the tsunami strikes, floating objects (sharp items such as a bow of a floating ship or a screw) come into contact with the retaining belts 6 and 7. However, cut resistance that does not damage can be obtained.

  The retaining belts 6 and 7 are combined with a flexible synthetic fiber cord 27 extending in the length direction and a steel cord 28 having a bias structure. In order not to float up, flexibility enough to bend in a substantially U shape (loop shape) can be obtained.

  Furthermore, since the retaining belt 6 is basically made of rubber reinforced with the synthetic fiber cord 27 and the steel cord 28, the weight in water can be reduced so as not to prevent the door body 11 from standing up. It becomes like this.

  In addition, since the retaining belts 6 and 7 are made of reinforced rubber, when subjected to a strong wave force such as a tsunami, the length of the retaining belts 6 and 7 increases by about 1 to 3 m. In the wire rope which is a plate standing posture holding mechanism, it is not necessary to provide a necessary shock absorber. Moreover, unlike steel wire ropes and chains, there is no risk of rusting even when immersed in seawater for a long period of time.

  Thus, the tension belt, the flexibility, the cut resistance, the light weight and the like can be satisfied in the retaining belts 6 and 7 of the swing type breakwater.

  Further, by interposing the closed cell foam rubber layer 6f for adjusting the specific gravity of the retaining belts 6 and 7 between the tension layer 6c and the cut-resistant layer 6d, the specific gravity of the retaining belts 6 and 7 is about 1.02 to 10. Since it can be adjusted to about 1.05, the weight in water can be further reduced so as not to prevent the door body 11 from standing.

  In the above-described embodiment, each of the first retaining belt 6 and the second retaining belt 7 is used to a minimum, but a strong tsunami wave force acts on each retaining belt 6, 7. Depending on the situation, it is possible to increase the number of the retaining belts 6 and 7 to about 3 to 6.

  Fig.11 (a) is the top view of the door body 11 which stood up at the time of pushing wave a, The same (b) is the front view seen from the land side of (a). In the example of FIGS. 11A and 11B, the number of the retaining belts 6 and 7 is increased to four. Each of the fixed belts 4 and 5 is also increased to four.

  Next, the connection structure of the retaining belts 6 and 7 will be described. Since the connecting structures of the retaining belts 6 and 7 are the same, only the connecting structure of the retaining belt 6 will be described below.

  12A and 12B show the door body 11 that employs the first clamp member 15A having a connection structure of the tension belt 6, wherein FIG. 12A is a side view of the standing position U1 at the time of pushing wave, and FIG. 12B is the standing position at the time of pulling wave. A side view of U2, (c) is a side view of the lying position D.

  13A and 13B show the door body 11 that employs the second clamp member 15B having a connection structure of the tension belt 6, wherein FIG. 13A is a side view of the standing position U1 at the time of pushing wave, and FIG. 13B is the standing position at the time of pulling wave. A side view of U2, (c) is a side view of the lying position D.

  In FIGS. 12 and 13, the standing position U1 of the door body 11 at the time of the push wave is about 90 degrees, but the standing position U2 of the door body 11 at the time of the pulling wave is set to about 45 degrees. For this reason, the pulling belt direction retaining belt 7 has a shorter overall length than the pushing wave direction retaining belt 6.

  Since the first clamp member 15A and the second clamp member 15B have the same basic structure, first, the second clamp member 15B of FIG. 14 will be described. 14A is a perspective view when the clamp portion 15c is open, and FIG. 14B is a side view when the clamp portion 15c is open. 15A and 15B show the second clamp member 15B. FIG. 15A is a front view when the clamp portion 15c is opened, and FIG. 15B is a plan view when the clamp portion 15c is opened.

  16A and 16B show the second clamp member 15B, where FIG. 16A is a perspective view when the clamp portion 15c is closed, FIG. 16B is a side view when the clamp portion 15c is closed, and FIG. 16C is an enlarged view of the main part of FIG. It is sectional drawing. 17A and 17B show the second clamp member 15B. FIG. 17A is a front view when the clamp portion 15c is closed, and FIG. 17B is a plan view when the clamp portion 15c is closed.

  A base plate 18 of the clamp member 15B is provided with a plurality of anchor bolts and nuts 22 (see FIG. 18) on the upper part of the reinforcing structure 19 (see FIG. 18) embedded in the foundation concrete 17 that becomes the base of the water bottom member 12. It is fixed. The base plate 18 is formed in a horizontally long rectangular shape that is slightly wider than the retaining belt 6. In addition, the height of the reinforcement structure 19 is about 3 m.

  The second clamp member 15B is connected to the base plate 18 at one end of the flat portion 15a so as to be swingable by a hinge shaft 15b, and is formed at the other end of the flat portion 15a. The clamp part 15c which has the pressing part 15p which presses down the part 6e between the base boards 18 is provided. A protrusion 15g that fits from above into the recess 6f of the shaft-shaped end 6e of the retaining belt 6 is formed in the pressing portion 15p of the clamp portion 15c.

  Specifically, a plurality (six in this example) of hinge fittings 15d are arranged at a constant interval in the length direction of the base plate 18, and each hinge fitting 15d is fixed to the base plate 18.

  Then, one end of each of the flat portions 15a of a plurality (five in this example) of the clamp members 15 is fitted between the adjacent hinge fittings 15d, and through-holes (one through each hinge fitting 15d and one end of each flat portion 15a ( (Not shown) and the hinge shaft 15b is continuously penetrated.

  Thereby, each 2nd clamp member 15B divided | segmented into plurality in the width direction of the fastening belt 6 can be opened / closed independently in the open position of FIG. 14 and the closed position of FIG.

  The flat portion 15a of each second clamp member 15B faces the base plate 18, that is, in a closed position of the clamp portion 15c, a plurality (two in this example) of bolts and nuts 20 (see FIG. 16). ) Will be fixed.

  When the clamp portion 15c is in the closed position, as shown in FIG. 16C, the pressing portion 15p of the clamp portion 15c presses the shaft-shaped end portion 6e of the retaining belt 6 between the base plate 18 and the protruding portion 15g has the shaft shape. By fitting into the recess 6f of the end 6e from above, the substantially upper half of the shaft-shaped end 6e is held together with the fixed shaft 16. At the same time, the tension layer 6c of the retaining belt 6 is strongly pressed against the base plate 18 by the rounded lower end of the protrusion 15g. Thereby, there is no possibility that the one end 6a of the retaining belt 6 is detached from the clamp portion 15c. Further, since the lower end of the protruding portion 15g is rounded, there is no possibility that the one end 6a of the holding belt 6 that is pressed down, particularly the tension layer 6c, is damaged.

  A bracket 15f in which a hook hole 15e for hooking a crane hook on water is formed at a position between the two bolts and nuts 20 across the outer surface of the flat portion 15a and the clamp portion 15c of each second clamp member 15B. It is fixed.

  Cut ends 16a in the direction perpendicular to the axis are formed at both ends of the fixed shaft 16 of the shaft-shaped end 6e of the retaining belt 6, and the end face of the clamp portion 15c corresponding to both ends of the fixed shaft 16 is shown in FIG. As described above, the retaining plate 15h that is engaged with the cut portion 16a when the shaft-shaped end portion 6e of the retaining belt 6 is fitted from above is fixed by the bolt 15j.

  Next, the first clamp member 15A shown in FIGS. 18 and 19 will be described. 18A is a plan view when the clamp portion 15c is closed, and FIG. 18B is a side view of FIG. FIG. 19 is an enlarged view of a main part of FIG.

  The second clamp member 15B is different from the second clamp member 15B in that the pressing portion 15p of the clamp portion 15c is not formed with the projection 15g, and the base plate 18 is formed into the recess 6f of the shaft-shaped end 6e of the retaining belt 6 from below. The protrusion 18b to be fitted is formed.

  20 and 21 also show the first clamp member 15A. 20A is a plan view when the clamp portion 15c is closed, and FIG. 20B is a side view of FIG. FIG. 21 is an enlarged view of a main part of FIG.

  20 and 21, the first clamp member 15 </ b> A is fixed to one side of the base plate 18, and the folding shaft member 23 of the retaining belt 6 is fixed to the other side of the base plate 18 with left and right brackets 24. The types shown in FIGS. 20 and 21 are distinguished from each other as the first clamp member 15 </ b> A ′ with the folding shaft.

  Here, the structure which installs each clamp member 15A, 15B in the basic concrete 17 used as the base of the water bottom member 12, and the door body 11 is demonstrated concretely.

  In the embodiment of FIG. 12, the first clamp member 15 </ b> A ′ with a folding shaft is used on the foundation concrete 17 side. The reinforcing structure 19 of the base plate 18 of the first clamp member 15 </ b> A ′ with the turn-back shaft is embedded in the foundation concrete 17 with the turn-back shaft member 23 on the push-wave a side.

  Further, the reinforcing structure 19 of the base plate 18 of the first clamp member 15 </ b> A ′ with the folding shaft is embedded in the foundation concrete 17, with the folding shaft member 23 on the drawing wave b side.

  Then, as shown in FIG. 21, the retaining belt 6 on the side of the push wave a is U-turned by the folded shaft member 23 so that the cut-resistant layer 6d faces the push wave a side, and then the shaft-shaped end of the one end 6a. The part 6e is connected to the first clamp member 15A ′.

  Similarly, the retaining belt 7 on the pulling wave b side is also U-turned by the folded shaft member 23 so that the cut-resistant layer 6d faces the pulling wave b side, and the shaft-shaped end portion of the one end 7a is first clamped. It connects with member 15A '.

  The second clamp member 15B is used on the door body 11 side. As shown in FIGS. 23A and 23B, one end portion 11a of the door body 11 (the same applies to the other end portion 11b) is formed into an arcuate curved surface portion 11g. Specifically, a circular steel pipe is installed. The diameter of this steel pipe is, for example, about 500 mm.

  The second clamp member 15B is a reinforcing frame inside the door body 11 so that the second clamp member 15B faces the one end portion 11a in the vicinity of the one end portion 11a of the upper surface 11c of the door body 11. 25 is fixed using bolts and nuts 20.

  Then, after the fastening belt 6 is folded back in an inverted U shape at the curved surface portion 11g of the one end portion 11a of the door body 11 so that the cut-resistant layer 6d faces the pushing wave a, the shaft-shaped end portion 6e of the one end 6a is turned back. Is coupled to the second clamp member 15B.

  In addition, as shown in FIG.23 (c), the recessed part 11h is formed in the one end part 11a and the other end part 11b of the door body 11, and the retention belt 6 (7) is reverse-U-shaped by the curved surface part 11g in this recessed part 11h. It can also be folded back into a shape.

  In the embodiment of FIG. 13, the second clamp member 15 </ b> B is used on the foundation concrete 17 side. As shown in FIGS. 22A and 22B, the upper portion of the reinforcing structure 19 is inclined obliquely in a side view, and the base plate 18 of the second clamp member 15B is fixed to the inclined upper portion. This inclined surface is installed so as to face at an angle substantially equal to the inclination angle of the retaining belt 6 when the door body 11 stands.

  The reinforcement construction body 19 of the base plate 18 is embedded in the foundation concrete 17 with the upper end of the slope being the door body 11 side on the push wave a side.

  Further, the reinforcement construction body 19 of the base plate 18 is embedded in the foundation concrete 17 with the inclined upper end being the door body 11 side on the pulling wave b side.

  Then, as shown in FIG. 22, the retaining belt 6 on the push wave a side connects the shaft-shaped end portion 6e of the one end 6a to the second clamp member 15B so that the cut-resistant layer 6d faces the push wave a side. .

  Similarly, the retaining belt 7 on the pulling wave b side also connects the shaft-shaped end of the one end 7a to the second clamp member 15B so that the cut-resistant layer 6d faces the pulling wave b side.

  Further, on the door body 11 side, the second clamp member 15B is used to connect the shaft-shaped end of the other end 6b (7b) of the retaining belt 6 (7) to the second clamp member 15B as shown in FIG. This is the same as the embodiment.

  In the embodiment of FIGS. 12 and 13, the first fixing belt 4 and the second fixing belt 5 have the same structure as the retaining belt 6 (7). The one end 4a of the first fixing belt 4 and the one end 5a of the second fixing belt 5 are fixed to the foundation concrete 17 by the second clamp member 15B, and the other end 4b of the first fixing belt 4 and the second end 5a are fixed. The other end 5b of the fixing belt 5 is fixed to the door body 11 by a second clamp member 15B. In this case, the cut resistant layer 6d faces upward.

  Next, the fixing shaft 16 is inserted through the hollow portion of the folded portion of the one end 6a and the other end 6b in a penetrating state, and the retaining belt 6 (the retaining belt 7 and the retaining belt 7) formed on the circular shaft-shaped end portion 6e in a side view. The outline of the manufacturing method of the fixing belts 4 and 5 will be described.

  As shown in FIG. 24 (a), fixed shafts 16 (which may be jigs) are arranged at the positions of one end 6a and the other end 6b, respectively. First, the sheet-like tension layer 6c, which is the innermost layer, is formed on both fixed shafts 16. Are wound in a loop (not limited to one sheet at a time, but a plurality of sheets can be used simultaneously), and the two ends of the one end 6a and the other end 6b are joined together. And the sheet | seat edge parts of the tension layer 6c are made into an endless shape by joining by thermocompression bonding.

  Similarly, as shown in FIG. 24 (b), the required number (9 in the case of 18 layers) of the sheet-like tension layers 6c are sequentially wound around the outside and joined together while being laminated, so that 18 layers are obtained. The tension layer 6c is completed.

  Thereafter, as shown in FIG. 24C, the two cut-resistant layers 6d are completed by joining the 18-layer tension layers 6c while sequentially stacking the cut-resistant layers 6d.

  On the other hand, the retaining belt 6 can be provided with a fold that bends in a substantially U shape at the lying position of the door body 11.

  FIG. 25A shows a method of attaching a crease that is bent in a substantially U shape so that the cut-resistant layer 6d side faces inward. A jig 30 for bending the cut-resistant layer 6d and the tension layer 6c into a substantially U shape is used. First, a plurality of cut-resistant layers 6d are joined to the outer surface of the jig 30 in a state of being bent in a substantially U shape while being sequentially applied, and then a plurality of tension layers are attached to the outer surface of the cut-resistant layer 6d. It joins in the state bent in substantially U shape, applying 6c sequentially.

  FIG. 25B shows a method of attaching a crease that is bent in a substantially U shape so that the tension layer 6c side is inward. A jig 30 for bending the cut-resistant layer 6d and the tension layer 6c into a substantially U shape is used. A plurality of tension layers 6c are sequentially applied to the outer surface of the jig 30 while being bent in a substantially U shape, and then a plurality of cut-resistant layers 6d are sequentially applied to the outer surface of the tension layer 6c. It joins in the state bent in the substantially U shape, applying to.

  With such a manufacturing method, either a crease that is folded in a substantially U shape so that the cut-resistant layer 6d side is inward or a crease that is folded in a substantially U shape so that the tension layer 6c side is inward. Can be attached.

  That is, the inner layer has a shorter overall length and the outer layer has a longer overall length. Therefore, when the tension belt 6 is removed from the state in which the tension belt 6 is stretched in a linear state by the action of the tensile force, the tension belt 6 has a crease in which the reaction force against the tensile force becomes stronger as the layer having a shorter overall length. become. As a result, the retaining belt 6 is bent into a substantially U shape by this folding so that the cut-resistant layer 6d side or the tension layer 6c side faces inward. In addition, if the plurality of tension layers 6c and the cut-resistant layer 6d are joined in a state of being bent in a substantially U shape, the crease is attached, so that the operation of attaching the crease can be easily performed.

  Thus, by attaching a crease to the retaining belt 6, the retaining belt 6 is less likely to float near the sea surface due to tidal currents and the like, so that it is difficult to obstruct the navigation route.

  In particular, if a folding fold that is bent in a substantially U shape so that the cut-resistant layer 6d side is inward is provided, the retaining belt 6 can be stored below the door body 11 when the door body 11 falls down. Since the retaining belt 6 does not float near the sea surface due to tides or the like, it does not hinder the route.

4 First fixing belt 5 Second fixing belt 6 First retaining belt 6c Tension layer 6d Cut-resistant layer 6e Shaft-shaped end 6f Closed cell foam rubber layer 7 Second retaining belt 11 Door 11a One end 11b Other End 11d Lower surface 12 Water bottom member 12a Upper surface 15A, 15A ', 15B Clamp member 16 Fixed shaft 27 Synthetic fiber cord 28 Steel cord 30 Jig a Pushing wave direction b Pulling wave direction D Lodging position U1, U2 Standing position

Claims (3)

It can swing between a lying position that falls in a substantially parallel state with respect to the water bottom member installed on the water bottom and a standing position that rises in a substantially vertical state with respect to the water bottom member. One end that receives the force and the other end that receives the wave force in the direction of the pulling wave are set above the bottom member, and the space between each end and the bottom surface that contacts the bottom member is seen in a side view. A door that is formed in a generally downward arc or trapezoidal shape;
A first fixing belt, one end of which is connected to the water bottom member in the push wave direction, the other end is connected to the vicinity of the other end of the door body, and the other end of the door body is swingably supported;
A second fixed belt, one end of which is connected to the water bottom member in the wave direction, the other end of which is connected to the vicinity of one end of the door body, and supports the one end of the door body so as to be swingable;
One end is connected to the water bottom member in the push wave direction, and the other end is connected to the vicinity of one end portion of the door body to hold the door body in an upright position against wave force in the push wave direction. A retaining belt,
One end is connected to the water bottom member in the pulling direction, and the other end is connected to the vicinity of the other end of the door body to hold the door body in an upright position against wave force in the pulling direction. a said anchoring belt swinging breakwater having detained a belt, a,
It is those Tension layer and cut resistance layer and a closed cell foam rubber layer are laminated,
The tension layer has a laminated structure in which a plurality of synthetic fiber cords are arranged in a width direction in a rubber layer and are interdigital or net-like reinforcing structures extending in the length direction, and a plurality of layers are laminated. Is responsible for the tensile force in the length direction,
The cut-resistant layer is a reinforcing structure in which a plurality of steel cords are arranged obliquely in the length direction in the rubber layer and extends in the width direction, and has a laminated structure in which at least two layers are laminated and adjacent to each other. A bias structure in which steel cords of matching layers cross each other at a bias angle of 10 to 30 degrees, and is responsible for protection of the tension layer,
The closed-cell foamed rubber layer is a rubber layer in which independent bubbles are contained substantially over the whole, and is interposed between the tension layer and the cut-resistant layer,
A retaining belt for an oscillating breakwater, wherein the cut-resistant layer of the first retaining belt is disposed so as to face the pushing wave side, and the cut-resistant layer of the second retaining belt is disposed toward the attracting wave side. The tension layer before SL detention belt formed in an endless shape, is between the one end and the other end, it joined at two-ply, through the fixed shaft to the hollow portion through the state of the folded portion of the one end and the other end The swing-type breakwater according to claim 1, wherein the shaft-shaped end portion is connected to a clamp member fixed to the water bottom member and the door body. Retaining belt. The retaining belt for a swing type breakwater according to claim 1 or 2 , wherein the retaining belt is provided with a crease that bends in a substantially U shape at a position where the door body is lying down .

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