JP5875795B2 - Elevating support structure for floating bridge - Google Patents

Description

  This invention is a floating body communication that allows a floating bridge such as a floating pier floating on the water surface or the sea surface and a connecting bridge spanned between land such as a quay or a breakwater to move up and down in response to the rise and fall of the sea surface due to tidal waves and waves. More particularly, the present invention relates to a lifting support structure for a floating connection bridge that prevents the connection bridge from falling from the floating body even when the sea level rises above the upper surface of a quay due to a typhoon or tsunami.

  The floating pier is used for mooring a ship or the like by floating on the sea surface, and the boarding / exiting of the ship from the floating pier is performed. A connecting bridge is built between this floating jetty and the quay or breakwater on the land, and passengers come and go between the land and the floating jetty via this connecting bridge.

  The floating pier is connected to, for example, a mooring pile fixed to the seabed, and moves up and down as the sea level rises and lowers (see Patent Document 1). On the other hand, the connecting bridge spanned between the floating pier and the land is, for example, a floating bridge connecting bridge described in Patent Document 2, and the base end on the land side has a horizontal axis by a hinge or the like. It is supported so as to be swingable as the center, and the free end on the floating pier side is allowed to move up and down according to the lifting and lowering of the floating pier, and the connection point with the floating pier is allowed to change They are linked by slide shoes.

  5 to 7 show a conventional connecting bridge 1, which is bridged between a floating pier 2 and a quay 3. In addition, the floating pier 2 is prevented from moving in the horizontal direction by a mooring pile (not shown), and is allowed to move in the vertical direction, that is, to move up and down according to the elevation of the sea level L due to waves and tidal waves.

  A free-end portion of the connecting bridge 1 on the floating pier 2 side is attached with a trap 2a that can swing about the horizontal direction. By this swing, the tip of the lap 2a is moved up and down by the floating pier 2 as well. 2 can be maintained in contact with the upper surface of 2. Further, a guide roller 2b capable of rolling on the upper surface of the floating bridge 2 is attached to the lower surface of the free end, and the free end of the connecting bridge 1 is connected to the floating bridge 2 with the bridge shaft of the connecting bridge 1. It is allowed to move in the direction.

  On the other hand, a fixed end portion on the quay 3 side of the connecting bridge 1 is attached with a trap 3a that can swing around the horizontal direction. In addition, an abutment 4 is installed on the quay 3 at a position facing the sea surface L, and a connecting bridge 1 is formed around the horizontal direction by a support portion 4a in which the lower surface of the fixed end is disposed on the upper surface of the abutment 4. It is supported so that it can swing freely.

  By the way, the floating pier 2 can be moved up and down (lifted and lowered) according to the water level by buoyancy, and the height from the water surface, that is, the freeboard is constant. For this reason, the connecting bridge 1 changes its slope in accordance with the lifting and lowering of the floating bridge 2, and the swing of the connecting bridge 1 for that purpose is allowed by the support part 4a on the fixed end side. In addition, since the connecting position with the connecting bridge 1 changes as the floating bridge 2 moves up and down, this change is allowed when the guide roller 2b rolls. In addition, as shown in FIG. 5, by setting the sea level at the time of high tide as a reference height, the fixed end is positioned at a position slightly higher than the height of the sea level that has risen at high tide. Occasionally, the connecting bridge 1 is in a state of being almost horizontal. In addition, as shown in FIG. 6, at the time of low tide, the connecting bridge 1 is inclined with the floating pier 2 side at the lower side, and in this state, it is installed so as to have a gradient that does not hinder traffic. If the fixed end side is positioned according to the sea level at the low tide with the low tide as the reference height, the fixed end side is submerged at high tide, and the connecting bridge 1 cannot be used.

JP 2007-40044 A Japanese Unexamined Patent Publication No. 7-18628

  However, when the water level rises to a position that is much higher than the upper surface of the quay, such as when a storm surge or tsunami comes due to a typhoon, as shown in FIG. The abutment 4 and the support 4a are submerged. For this reason, external forces such as pumping pressure and wave pressure act on the abutment 4 and the support 4a, the fixed end of the connection bridge 1 fixed to the support 4a, and the connection bridge 1 itself, thereby damaging them. Or the connecting bridge 1 may be dropped from the support portion 4a to drift the connecting bridge 1.

In the case where arranged abutment at a position higher than the upper surface 31 of the quay 3 assumes a storm surge and tsunamis, etc., it will be intends island utilization is exacerbated by step between the upper surface 31 of the quay 3, also At low tide, the height difference between the floating pier 2 and the abutment 4 becomes large, and it is necessary to lengthen the connecting bridge 1 in order to secure an allowable gradient, which may impair convenience.

  Therefore, the present invention provides a lifting support structure for a floating connecting bridge that does not submerge on the fixed end side and does not fall off from land even when storm surges or tsunamis occur. It is aimed.

As a technical means for achieving the above object, the floating support bridge support structure according to the present invention includes a floating body and land that are installed on the sea surface and allowed to move up and down according to the rise and fall of the water level. In the support structure for the end of the floating bridge connecting to the land side used for traffic between the floating body and the land, the end on the land side of the connecting bridge is swung. It is supported freely and comprises a floating abutment floating on the sea surface and guide means provided with guide piles fixed to the side of the quay and the seabed, and the guide means according to the fluctuation of the water level. It is characterized by guiding the up and down of the floating abutment and also during abnormal tide levels that are higher than the water level at high tide .

The abutment connecting the connecting bridge on the quay side is a floating abutment that floats on the sea surface, and is allowed to move up and down while being guided by the guide means. For example, when a storm surge or tsunami arrives, the water level may be higher than the upper surface of the quay, and even in that case, the floating abutment rises to a position higher than the water level at high tide. To be able to. That is, the guide pile of the guide means is fixed so as not to move even when receiving a wave, and is fixed to the side surface of the quay or the seabed ground.

  In the floating support bridge lifting / lowering support structure according to the second aspect of the present invention, the floating abutment is floated on the sea surface by buoyancy as a hollow box.

  The floating abutment has a hollow box shape. For example, it can be formed as a steel or a composite structure of steel and concrete. Thereby, buoyancy can be obtained by the floating abutment itself, and the structure becomes simple. In addition, for example, it is also possible to form a structure having buoyancy by forming a shell with a material having a high strength using a material having a large buoyancy such as polystyrene foam as a core material.

  Further, the lifting support structure for a floating connecting bridge according to the invention of claim 3 is characterized in that the guide means is provided with a stopping means that does not lower the floating abutment below a certain tide level.

If the floating abutment descends according to the water level at low tide, the pier side end of the connecting bridge will be located at a lower position than the quay, and it will be difficult to come and go to the connecting bridge due to the height difference from the upper surface of the quay. End up. For this reason, the end of the connecting bridge on the quay side is not lowered below a certain level. For example, a stopping means such as an engaging projection is provided on the guide pile constituting the guide means so that the floating abutment does not fall below the water level at high tide.

  The stop means may be provided in accordance with the water level at the time of high tide so that it does not drop below the water level at high tide, but the stop means is provided at a position slightly lower than the water level at high tide. Is preferred. This is because, at high tide, the floating abutment is detached from the stopping means and floats on the sea surface, so that it is possible to prevent the floating abutment from being fixed to the stopping means due to secular change or the like. That is, the level below the certain tide level is a tide level slightly lower than the tide level at high tide.

  According to the lifting support structure for the floating connecting bridge according to the present invention, the land and the floating pier are connected to each other by the connecting bridge even when the sea level is raised or lowered due to tidal waves or waves. When a storm surge or tsunami due to a typhoon arrives and the water level rises above the upper surface of a quay or the like, the floating abutment is guided by the guide means and rises according to the tide level. For this reason, the fixed end on the quay side of the connecting bridge does not fall off, and the fixed end can be prevented from being damaged or the connecting bridge drifting.

  In addition, according to the lifting support structure for the floating connecting bridge according to the invention of claim 2, the floating abutment can have a simple structure, and the connecting structure with the connecting bridge can be the same as the conventional structure. There is no need to modify the connecting bridge.

  Further, according to the lifting support structure for the floating bridge according to the invention of claim 3, since the water level at the time of high tide can be used as a reference during normal times, the fixed end does not drop below the water level at the time of high tide, The function of the connecting bridge is not impaired.

It is a side view of the connecting bridge for floating bodies provided with the raising / lowering support structure which concerns on this invention, and has shown the state at the time of high tide. It is a schematic perspective view explaining the raising / lowering support structure which concerns on this invention. It is a side view of the connecting bridge for floating bodies provided with the raising / lowering support structure which concerns on this invention, and has shown the state at the time of low tide. It is a side view of the connecting bridge for floating bodies provided with the raising / lowering support structure which concerns on this invention, and has shown the state at the time of high tide. It is a side view which shows the conventional connecting bridge for floating bodies for the floating pier suspended on the sea surface, and has shown the state at the time of high tide. It is a side view which shows the state at the time of low tide of the connecting bridge for floating bodies shown in FIG. It is a side view which shows the state at the time of high tide levels, such as a tsunami of the connecting bridge for floating bodies shown in FIG. 5, and is a side view explaining the problem at the time.

  Hereinafter, based on the illustrated preferred embodiment, the lifting support structure for a floating connecting bridge according to the present invention will be specifically described. FIG. 1 and FIG. 2 show a lifting support structure for a floating bridge according to the present invention. The same parts as those of the conventional structure shown in FIGS.

  FIG. 1 shows a state in which the sea level L is at high tide, and the floating pier 2 that is a floating body is at a height position at which it has risen most during normal times. Guide means 10 is disposed on the wall surface of the quay 3. The guide means 10 is mainly composed of a guide pile 10a fixed to the side surface of the quay 3 and a guide pile 10b planted on the seabed at an appropriate distance from the guide pile 10a. In addition, although two guide piles 10a and 10b are shown in the drawing, as will be described later, the necessary number is provided to be able to reliably guide the lifting and lowering of the floating abutment.

  The guide piles 10a and 10b function as rails extended in the vertical direction. For example, a shape steel such as H-shaped steel or I-shaped steel, a steel pipe pile, or the like can be used. A floating abutment 11 is provided so as to be moved up and down by being guided by the guide piles 10a and 10b. The floating abutment 11 preferably has a structure capable of adjusting its buoyancy, for example, as a hollow box, and can be formed as a steel structure formed by welding a steel plate or a composite structure of steel and concrete. . A fixed end portion of the connecting bridge 1 is supported on the upper surface of the floating abutment 11 via a support portion 4a. In addition, the height of the sea level L at high tide is the reference height, and the position of the floating abutment 11 (initial height is set to support the fixed end in a state where the connecting bridge 1 spanned over the floating pier 2 is almost horizontal. A stopper 12 is provided as a stopping means for preventing the floating abutment 11 from descending below the initial height. In this case, the position of the stopper 12 is preferably a position where the floating abutment 11 that has floated at the tide level at the time of high tide slightly floats from the stopper 12. If it is in this position, the floating abutment 11 will be separated from the stopper 12 at high tide, preventing the floating abutment 11 from adhering to the stopper 12 due to secular change compared to a structure that does not separate even at high tide. it can. It should be noted that instead of the stopper 12, for example, without forming rails on the guide piles 10a, 10b below the position, or by increasing the outer dimensions of the guide piles 10a, 10b at the position, etc. Any structure can be used as long as the floating abutment 11 is prevented from falling below the position.

  The effect | action of the raising / lowering support structure of the connecting bridge for floating bodies which concerns on this invention comprised by the above is demonstrated below.

  As shown in FIG. 1, the floating pier 2 rises to the highest position at high tide, and the connecting bridge 1 takes a posture close to the horizontal, so that the floating pier 2 and the quay 3 can travel. When the sea level L descends due to low tide, the floating pier 2 with a constant drought also descends as shown in FIG. On the other hand, since the floating abutment 11 is prevented from descending by the stopper 12 and its position is maintained at the height at the reference height, the connecting bridge 1 has a free end on the floating pier 2 side as shown in FIG. The posture is slanted with the part side at the bottom. In this state, the floating pier 2 and the quay 3 can be moved by the connecting bridge 1. Note that the change in the posture of the connecting bridge 1 according to the rise and fall of the sea level L due to this tidal flow is the same as in the conventional connecting bridge 1, and the connecting bridge 1 swings around the support portion 4a. The free end side of the bridge 1 is due to the change of the connection position with the floating bridge 2 by the rolling of the guide roller 2a.

  When a tsunami arrives due to a storm surge or an earthquake caused by a typhoon, the sea level L may rise to a position higher than the altitude of the upper surface 31 of the quay 3 or nearby land. FIG. 4 shows a state in such a case. That is, this is a case where the sea level L reaches a level higher than the upper surface 31 of the quay 3, and in this case, the floating abutment 11 rises along with the sea level L. At this time, since the floating abutment 11 is guided by the guide piles 10a and 10b and rises, the floating abutment 11 does not leave the guide piles 10a and 10b. For this reason, the connecting bridge 1 does not drift. Moreover, since the floating abutment 11 is located on the sea level L, the connecting bridge 1 whose fixed end is connected to the floating abutment 11 is also floated on the sea level L, and the pumping pressure and wave pressure are The influence is suppressed and breakage etc. can be avoided.

  By the way, the relationship between the total weight of the floating abutment 11 and the connecting bridge 1 and the buoyancy they receive from seawater. The total weight is greater than the buoyancy near the water level at high tide, and the water level rises above the upper surface 31 of the quay 3 In that case, it is preferable to adopt the shape, size, structure, etc. of the floating abutment 11 so that the buoyancy is greater than the total weight. In particular, the box-shaped floating abutment 11 is preferable because the weight can be adjusted by filling the interior with water.

  In addition, if the floating abutment 11 and the seabed are connected with a rope or the like, even if the tide level rises to an unexpected height and the floating abutment 11 leaves the guide means 10, the floating abutment 11 and the connecting bridge 1 It is possible to prevent drifting as much as possible.

  According to the lifting support structure for a floating connecting bridge according to the present invention, when a storm surge or tsunami arrives, the connecting bridge can be raised according to the rise in sea level, so the connecting bridge is damaged or drifted. This contributes to the rapid use of the connecting bridge and floating pier when the sea level returns to its normal height.

L Sea surface 1 Connecting bridge 2 Floating pier 3 Quay
31 Top 4 Abutment
4a Bearing
10 Guide means
10a, 10b Guide pile
11 Floating abutment
12 Stopper (stop means)

Claims (3)

The floating bridge connecting the floating body that is installed on the sea surface and is allowed to move up and down according to the rise and fall of the water level, and is used for traffic between the floating body and the land. In the support structure of the end connected to the land side,
A floating abutment that floats on the sea surface while supporting the end of the connecting bridge on the land side in a swingable manner,
It consists of guide means with guide piles fixed to the side of the quay and the seabed ,
A floating support bridge raising / lowering support structure characterized in that the guide means guides the raising and lowering of the floating abutment according to the fluctuation of the water level, and also guides at an abnormal tide level higher than the water level at high tide .   The floating support structure for a floating connecting bridge according to claim 1, wherein the floating abutment is floated on the sea surface by buoyancy as a hollow box.   The lifting support structure for a floating connecting bridge according to claim 1 or 2, wherein a stopping means that does not lower the floating abutment below a certain tide level is provided in the guide means.

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