JP6626180B2 - Floating flap gate - Google Patents

Description

  The present invention relates to a floating flap gate which is installed, for example, as a part of a seawall or at an opening of a seawall, and floats a door so that seawater does not flow into a land side during a tsunami or storm surge. The present invention particularly relates to a floating flap gate which requires assistance such as a counterweight and is suitable for a case where an installation location has a large span.

  In the event of a tsunami or storm surge, in the early stage of inflow of seawater, the floating action of the door body is delayed and seawater does not overflow to the land side, and when the water level drops, it easily falls down and suddenly falls down There is a floating flap gate that does not behave (for example, Patent Document 1).

  The conventional floating flap gate 101 shown in FIG. 5 has, for example, one rod 103 attached to the entire width direction of the front end of the door body 102, and has a function of supporting a hydraulic load and attaching one end of a wire rope 104. ing.

  The other end of the wire rope 104 is provided with a fixed pulley 106 installed at the door stop 105 above the distal end 102b of the door body 102 when it falls down, and a fixed pulley 107 installed above the base end 102a of the door 102. Is attached to the counterweight 120 via the. Therefore, in normal times, the weight of the counterweight 120 always acts on the tip of the door body 102. In FIG. 5, rs is a road surface of the opening, and 121 is a door stop (storage unit).

  In the conventional floating flap gate 101, at the initial stage when seawater starts to flow in, the counterweight 120 descends, whereby the door 102 is pulled in the upright direction to assist the uprightness (FIG. 6A). To (b)).

  In such a floating flap gate of the type in which the tension of the rope is applied to both ends of the tip of the door body and used as an assisting force for standing up, as the width of the door body becomes longer, it is caused by the tension of the rope in a normal state. The deflection at the tip of the door body increases. Then, the bending of the front end portion of the door body may be lifted off the road surface in normal times, and may hinder safe traveling of people and vehicles.

  In order to keep the amount of deflection below the allowable value, it is conceivable to increase the thickness of the door body and increase the rigidity, but in this case, the weight of the door body is inevitably increased. An increase in the weight of the door body leads to an increase in the weight of the entire equipment, resulting in an increase in cost.

JP 2012-241449 A

  The problem to be solved by the present invention is that when a floating flap gate requiring assistance such as a counterweight is installed in a place with a large span, in order to suppress the deflection of the door, the thickness of the door is increased. This increases the weight of the equipment, leading to an increase in the weight of the entire equipment.

  The present invention provides, for example, a long-floor type floating flap gate requiring assistance such as a counterweight, without increasing the thickness of the door body, and causing the deflection of the tip of the door body caused by the tension of the rope ( The purpose of the present invention is to prevent floating from the road surface during normal times).

The present invention
A floating flap gate in which the distal end is configured to be able to rotate and float with the base end as a fulcrum,
An upper girder attached to a tip side of the door body, having an upper surface when the door body is lying down , and having at least an L-shaped cross section ;
A door suspension beam that is disposed directly below a surface located above the upper girder and has both ends connected to one end of the rope,
A pulling means connected to the other end of the rope,
The upper girder is interposed between the upper surface of the upper girder when the door body falls down and the door body suspension beam, and when the door body falls down, the tension of the rope by the tension means applied to the door body suspension beam An adjusting member for equally acting a reaction force on the upper girder,
The most important feature is to have.

  In the present invention, an adjusting member is interposed between the upper girder and the door suspension beam, and the other end is provided on both ends of the door suspension beam by, for example, a counterweight, a compression coil spring, or a tension coil spring. Connect one end of the rope connected to the means.

  According to the configuration of the present invention, since the weight of the counterweight applied to both ends of the door suspension beam is smaller than the force applied by the dead weight of the door, the counterweight is balanced and stationary in normal times when buoyancy does not act. At this time, the reaction force against the tension of the rope due to the weight of the counterweight applied to the door suspension beam is equally (equally distributed) applied to the upper girder by the adjusting member, and the tip of the door The upper girder attached to the side does not bend.

  According to the present invention, a door body suspension beam is provided in the upper girder constituting the tip of the door body, and a beam (equally distributed load) having an even distribution is applied to the upper girder via the adjusting member from the beam bent by the weight of the counterweight. The structure that can be transmitted and adjusted so that the upper girder rests flat on the bent beam is adopted. Therefore, even when the floating flap gate is installed in a place with a large span, the deflection of the front end portion of the door body can be suppressed, so that a person or a vehicle can travel safely.

It is the figure which looked at the whole floating type flap gate of the present invention from the side. It is a figure explaining an attachment state of an upper girder and a door suspension beam at the time of a door body fall in a floating type flap gate of the present invention. 2A and 2B are diagrams illustrating a mounting state of an upper girder and a door suspension beam in a floating flap gate of the present invention, wherein FIG. 2A is a partially cutaway cross-sectional view taken along a line AA in FIG. 2, and FIG. It is an enlarged view of the part of the bolt used as a. 2A and 2B are diagrams illustrating the state of a door suspension beam when the door is erected and the role of a stopper member in the floating flap gate of the present invention. FIG. FIG. 2B is an enlarged view of a portion provided with a slip-off prevention member. It is the schematic block diagram of the conventional floating flap gate, (a) is the figure seen from the side, (b) is the figure seen from the front, (c) is the figure seen from the plane. It is a figure explaining the operation principle of the conventional floating type flap gate which uses a counterweight as an assistant, (a) is an inflow early stage, (b) is a figure which showed the middle stage of rising, and (c) is a figure which showed the latter stage of rising.

  An object of the present invention is to prevent deflection of a front end portion of a door body without increasing the thickness of the door body even for a long span type floating flap gate requiring assistance such as a counterweight. This is realized by causing the reaction force against the tension of the rope due to the weight of the counterweight applied to the door suspension beam to act equally (evenly distribute and act) on the upper girder by the adjusting member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of a floating flap gate of the present invention.

  In FIG. 1, reference numeral 1 denotes a floating flap gate of the present invention installed on a road surface rs at an opening of a breakwater, for example. This floating type flap gate 1 uses the water pressure of the rushing seawater W when the water level is increased due to the occurrence of a tsunami or a storm surge, and is in a plane in the height direction in the direction in which the seawater flows (in the direction of the arrow in FIG. 1). Then, the tip side 2c of the door body 2 is floated and oscillated about the rotation center 2a of the base end side 2b as a fulcrum to shut off the opening of the seawall in a watertight state, so that the seawater flows into the living space on the land side. It is to prevent. Note that side watertight rubber (not shown) is attached to both sides of the door body 2 in the width direction.

  In the floating type flap gate 1 of the present invention shown in FIG. 1, an upper girder 2 d is attached to the most distal end portion of the distal end side 2 c of the door body 2. As shown in FIG. 2, the upper girder 2d is a girder having a steel structure in which when the door body 2 is in the down state, three surfaces located above and on the side are made of steel plates, and the lower part is in an open state. It is. Here, referring to FIG. 2, “the surface located above” of the upper girder 2 d is one of three surfaces constituting the upper girder 2 d provided so as to be continuous with the upper surface of the door body 2. 2 da. The “side surface” of the upper girder 2d is defined as two surfaces extending downward from both ends in the height direction of the door body 2 on the upper surface 2da by the thickness of the door body 2. 2db and 2dc.

  In this embodiment, inside the upper girder 2d, a door suspension beam 3 made of a steel body having a rope connecting shaft 3a at both ends is included. There is a gap between the door suspension beam 3 and the inner surface of the steel plate forming the upper girder 2. Then, the rope connecting shafts 3a at both ends of the door suspension beam 3 penetrate through the guide grooves provided in the side door stops 9 on both sides to protrude into the storage portion, and the protruding rope connecting shafts 3a , One end of a wire rope 4 is attached to each.

  As shown in FIG. 1, the other end of the wire rope 4 is connected to the first fixed pulley 7 and the first fixed pulley 7, as shown in FIG. It is connected to the counterweight 5 via the two fixed pulleys 8. The present invention does not limit the position and the height of the first constant pulley 7 and the second constant pulley 8.

  Therefore, in normal times, the weight of the counterweight 5 always acts on the door suspension beam 3 via the wire rope 4. In FIG. 1, reference numeral 10 denotes a tension rod for defining a floating upper limit position of the door 2.

  As an example, the first constant pulley 7 is configured such that the counterweight 5 is located at the lowest point when the inclination angle θ with respect to a horizontal plane (the same plane as the road surface rs) when the door body 2 stands is 45 degrees, for example. Has been installed. There is no problem if the inclination angle θ is in the range of 10 degrees to 80 degrees, and the inclination angle θ can be appropriately designed to a desired angle.

  Therefore, when a storm surge or a tsunami occurs, when the rushed seawater attempts to flow over the floating flap gate 1 and to the land side, the floating flap gate 1 of the present invention uses the door body 2 Due to the buoyancy generated by acting on the door, the door body 2 floats without power and without human operation. At the start of the ascent, the counterweight 5 is lowered to assist the ascent of the door 2. Then, when the inclination angle θ of the door body 2 with respect to the horizontal plane becomes 45 degrees, the counterweight 5 becomes the position of the lowest point. When the inclination angle θ of the door body 2 with respect to the horizontal plane exceeds 45 degrees, the counterweight 5 rises due to the standing of the door body 2, and the counterweight 5 acts as a resistance, thereby reducing the rising speed of the door body 2, Reduce the impact force on completion.

  In addition, in order to prevent the door body suspension beam 3 from falling out from the lower side where the upper girder 2d is open due to the tension of the wire rope 4 at the time of completion of the standing, in this embodiment, the upper girder is used. 2 are provided with two stoppers 2e at both ends.

  When the water level is lowered due to a storm surge or a tsunami, the counterweight 5 is lowered in the initial stage of falling, and the door 2 is pulled in the falling direction and falls down following the drop in the water level. When the inclination angle θ of the door 2 with respect to the horizontal plane becomes 45 degrees, the door 2 and the wire rope 4 are aligned, and the counterweight 5 is at the lowermost position. When the inclination angle θ of the door body 2 with respect to the horizontal plane is smaller than 45 degrees, the counterweight 5 rises due to the fall of the door body 2, and the counterweight 5 becomes a resistance to reduce the falling speed of the door body 2, Reduce the impact force on completion.

  Next, the structure of the adjustment member 6b for adjusting the distance between the upper spar 2 and the door suspension beam 3 will be described with reference to FIGS. As shown in FIG. 2, bolt holes 6 a are provided at required intervals in the longitudinal direction of the upper girder 2 d on the upper surface 2 da of the upper girder 2 d when the door body is lying down.

  When the door body falls down, the wire rope 4 connected to the counterweight 5 is connected to the rope connection shafts 3a at both ends of the door body suspension beam 3, and a force for lifting the door body suspension beam 3 upward. Always working. Since the force acting from the wire rope 4 due to the weight of the counterweight 5 is smaller than the force acting due to the weight of the door body 2, in a normal state where buoyancy does not act, it is balanced and stationary in this state.

  In this embodiment, a bolt 6b interposed between the upper beam 2d and the door suspension beam 3 via the bolt hole 6a is used as an adjusting member, and the weight of the counterweight 5 applied to both ends of the door suspension beam 3 is used. As shown by a plurality of arrows f in FIG. 3, the reaction force of the wire rope 4 causes the upper spar 2d to act equally (act in a uniformly distributed manner) on the upper spar 2d via the bolts 6b. The bolt 6b does not fasten the upper spar 2d and the door suspension beam 3, but inserts it into the bolt hole 6a to interpose between the upper spar 2d and the door suspension beam 3 to reduce the distance. It is a member to be adjusted.

In the present invention having the above structure, the door suspension beam 3 is bent inside the upper girder 2, but the upper girder 2 is moved from the bent door suspension beam 3 to the counterweight 5 via the bolt 6b. Since the reaction force to the tension F of the wire rope 4 due to the weight is evenly distributed in the span direction, no bending occurs, and the gap between the wire rope 4 and the road surface rs can be kept smooth. Therefore, the floating flap gate 1 of the present invention can suppress the deflection of the door body 2 in normal times, and can form a smooth road surface, which can contribute to the safe running of people and vehicles.
Note that the weight of the counterweight 5 is smaller than the force acting due to its own weight of the door body 2, and the door body suspension beam 3 is bent by the weight of the counterweight 5, but the rigidity is not deflected any more. It is a beam.

  In the above description, the deflection of the door hanging beam 3 and the action of the bolt 6b used as an adjustment member when the door is falling have been described. However, the bending of the door hanging beam 3 is maximum when the door is falling. When the water is increased due to the tsunami or storm surge, the deflection of the door suspension beam 3 due to the weight of the door 2 gradually decreases as the door 2 rotates and floats. Then, when the door body 2 is completely raised, as shown in FIG. 4, the bending of the door body suspension beam 3 is hardly recognized.

  Supplementally, when the standing is completed, the deflection of the door suspension beam 3 is not completely zero, but the deflection is performed with the bolt 6b and the slip-off prevention member 2e at the center of the door as support points and the rope connecting shaft 3a as an operation point. However, as shown in FIG. 4 (a), since the distance between 2e and 3a is short, only a small level of bending which does not pose a practical problem occurs at the time of completion of standing. Therefore, the function of the adjusting member is unnecessary at the time when the door body 2 is completely raised. When the standing is completed, the above-mentioned slip-off preventing member 2e prevents the door hanging beam 3 from slipping out, and the slip-out preventing member 2e receives the weight of the counterweight 5.

  Further, according to the configuration of the above embodiment using the adjusting means 6 including the bolt hole 6a provided in the upper spar 2d and the bolt 6b screwed into the bolt hole 6a, it is only necessary to change the screwing amount of the bolt 6b. This is preferable because the distance between the upper girder 2d and the door suspension beam 3 can be freely adjusted.

  That is, as a configuration for preventing the bending of the front end portion of the door body, it is conceivable to use an arched camber that is manufactured in advance so as to be warped in the opposite direction. 3 may be left to warp naturally, and the distance between the upper spar 2d and the door suspension beam 3 can be adjusted to an optimum value by a bolt 6b provided as an adjusting member. Therefore, the configuration of the present invention using the upper girder and the door suspension beam requires less labor and time in comparison with the above-described configuration in which the camber is manufactured, and is advantageous in terms of cost.

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

  For example, the manner in which the first constant pulley 7 and the second constant pulley 8 are installed in the storage section having the side door stop 9 is not limited to the embodiment shown in FIG. A moving pulley may be used as necessary.

  Further, in the above-described embodiment, the tension rod 10 for defining the floating upper limit position of the door body 2 is installed, but the tension rod 10 is not necessarily an essential member.

  In the above embodiment, the wire rope 4 is used, but the rope connected to the rope connection shaft 3a of the door suspension beam 3 is made of polyamide, polyester, polyethylene, polypropylene, aramid, or the like. Fiber ropes such as polyarylate and ultra-high-density polyethylene may be used.

  Further, in the above-described embodiment, the example in which the counterweight 5 is used as the means for pulling the wire rope 4 has been described, but the pulling means is not limited to this. For example, a tension means using a spring mechanism such as a compression coil spring or a tension coil spring may be used.

  Further, in the above-described embodiment, an example is shown in which the upper girder 2d whose lower part is open only when the door body falls down is used, but the shape of the upper girder 2 is not limited to this. For example, the upper girder 2 may be formed of a steel body having an L-shaped cross section.

  In addition, although a preferred example in which the bolt holes 6a are provided at equal intervals in the longitudinal direction of the upper spar 2d has been described, it is not always necessary to make the intervals equal. Further, the number of the bolt holes 6a is not limited to the example of FIG.

DESCRIPTION OF SYMBOLS 1 Floating type flap gate 2 Door 2a Rotation center 2b Base end 2c Tip 2d Upper girder 3 Door suspension beam 3a Rope connection shaft 4 Wire rope 5 Counter weight (tensile means)
6 Adjusting means 6a Bolt hole 6b Bolt (adjusting member)
7 first constant pulley 8 second constant pulley 9 side door stop 10 tension rod

Claims (2)

A floating flap gate in which the distal end is configured to be able to rotate and float with the base end as a fulcrum,
An upper girder attached to a tip side of the door body, having an upper surface when the door body is lying down , and having at least an L-shaped cross section ;
A door suspension beam that is disposed directly below a surface located above the upper girder and has both ends connected to one end of the rope,
A pulling means connected to the other end of the rope,
The upper girder is interposed between the upper surface of the upper girder when the door body falls down and the door body suspension beam, and when the door body falls down, the tension of the rope by the tension means applied to the door body suspension beam An adjusting member for equally acting a reaction force on the upper girder,
A floating flap gate comprising:   The adjusting member is a bolt interposed between the upper girder and the door suspension beam by being inserted into a bolt hole provided at a required interval in a longitudinal direction of the upper girder. Item 2. The floating flap gate according to Item 1.

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