JP4607036B2 - Tsunami countermeasure structure - Google Patents

Description

  The present invention relates to a tsunami countermeasure structure.

  In recent years, there are concerns about the occurrence of earthquakes such as the Tokai, Tonankai, and Nankai-oki earthquakes in Japan, and tsunami countermeasures associated therewith are urgently needed.

Conventionally, as a structure for preventing a tsunami, there are planar structures such as a breakwater, a seawall, and a sluice.
They close gates and sluices when a tsunami occurs, and the closed surface receives the tsunami to attenuate the energy of the tsunami and prevent the tsunami from going up.

  On the other hand, the tsunami countermeasure structure installed at the estuary not only functions effectively when a tsunami occurs, but it must not disturb the flow when the river flow is high, such as during a typhoon or heavy rain.

  In places with a large river flow rate, the topography of the estuary changes daily due to the flow of sediment from the upstream. In addition to tsunami countermeasures, there is a need for highly convenient facilities that can be used at all times.

Therefore, there are cases where gates and sluices are installed in existing structures such as bridges, and the following is known (Patent Document 1).
Japanese Patent Laying-Open No. 2005-2741

  However, the force that the structural part receives from the tsunami is enormous, and a large-scale facility is necessary to counter the tsunami with such a planar structure, and there are undulations in the ground, sediment accumulation, When the variation in height due to erosion is large, it is difficult to install the gate and there is a problem that the operation becomes insufficient.

  The present invention has been made in view of such a problem, and an object thereof is to provide a tsunami countermeasure structure that is small in scale and operates regardless of the properties of the ground.

  In order to achieve the above-described object, the present invention is provided between a pair of first pillars that are provided on a bridge provided on the water and that are movable in the vertical direction, and between the pair of first pillars. A second column having a slit, and a connecting plate provided through the slit of the second column and having both ends fixed to the pair of first columns. The tsunami countermeasure structure is characterized in that the second pillar and the connecting plate are submerged in water by lowering the first pillar.

A plurality of the second pillars may be provided between the pair of first pillars.
The shape of the tip of the second pillar may be an angle with respect to the axial direction of the pillar, or a plurality of tips may be provided.
Further, the pair of the first pillar body, the second pillar body, and the connecting plate may be provided on both side surfaces of the bridge, and a plurality of the first pillar body, the second column body, and the connection plate are provided in a staggered arrangement on each side surface of the bridge. May be.

The second column body is a tubular body, and a third column body is movably provided therein. When the second column body sinks in water, the third column body is the first column body. You may expose to the exterior of 2 pillars.
The third column may have a tip portion having an angle with respect to the axial direction of the column, and may have a plurality of tip portions.

  ADVANTAGE OF THE INVENTION According to this invention, the tsunami countermeasure structure which can respond rapidly at the time of the tsunami attack on a small scale can be provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a perspective view showing a tsunami countermeasure structure 1 according to this embodiment, FIG. 2 is a view in the direction of arrow B in FIG. 1, and FIG. 3 is a cross-sectional view of a column 13a.

As shown in FIGS. 1 and 2, the tsunami countermeasure structure 1 is provided on a bridge 3 provided in a river. The bridge 3 has piers 5a and 5b installed on the ground 20, and a floor slab 4 is provided on the piers 5a and 5b.
The floor slab 4 is a road or the like.

The piers 5a and 5b have grooves 7a and 7b provided in the vertical direction on the downstream side, and the pillars 9a and 11a as the first pillars are provided in the grooves 7a and 7b so as to be movable in the directions A1 and A2. It has been.

Columnar columns 13a, 13b, 13c, 13d, and 13e as second columns are provided between the columns 9a and 11a, and the columns 13a, 13b, 13c, 13d, and 13e are connected to each other. Plate-like connecting plates 15a and 15b are provided so as to be inserted.
Both ends of the connecting plates 15a and 15b are fixed to the column bodies 9a and 11a.

As shown in FIG. 3, the column 13a is composed of a cylindrical main body 23a and a cone-shaped tip 25a, and the main body 23a is provided with slits 27a and 29a in the axial direction.
The connecting plates 15a and 15b are provided through the slits 27a and 29a, but the slits 27a and 29a are wider than the connecting plates 15a and 15b.

  The shape of the tip portion 25a is not limited to a cone shape as long as it is a shape that easily penetrates into the ground, and may be any shape that has an angle with respect to the axial direction of the column. A bamboo shape (the shape of the tip when the cylinder is cut obliquely) may be used.

In addition, when the ground is rock and the tip cannot penetrate, it is necessary to have a shape in which frictional resistance acts against a force in the horizontal direction, for example, a plurality of claw shapes.
That is, a plurality of tip portions 25a may be provided.

  Although the column 13a is not fixed to the floor slab 4 or the connecting plates 15a and 15b, the vertical movement beyond the length of the slit is restricted by the connecting plates 15a and 15b inserted through the slits 27a and 29a. Yes.

  Therefore, when the columns 9a and 11a are moved in the directions A1 and A2 in FIGS. 1 and 2, the columns 13a are moved in the directions A1 and A2 in accordance with the movement of the connecting plates 15a and 15b fixed to the columns 9a and 11a. Moving.

  However, since the anti-blur 17 is provided on both side surfaces of the column 13a, it cannot move in the horizontal direction.

  Note that the structures and operations of the column bodies 13b, 13c, 13d, and 13e are the same as those of the column body 13a, and thus description thereof is omitted.

  Moreover, as shown in FIG. 2, the column bodies 13a, 13b, 13c, 13d, and 13e are provided at a position higher than the highest water level 21 of the river in normal times. This is because if the column bodies 13a, 13b, 13c, 13d, and 13e are provided at positions lower than the highest water level 21 at normal times, the flow of the river is inhibited.

  In addition, the material of the column bodies 9a, 11a, 13a, 13b, 13c, 13d, and 13e is steel or concrete, and may be hollow.

The connecting plates 15a and 15b are preferably made of a material that is not damaged by a tsunami drifting object, such as a steel plate or a precast concrete plate. In addition, it is desirable that specific gravity is larger than water.
This is because if the specific gravity is smaller than that of water, the buoyancy increases, and the pillars 13a, 13b, 13c, 13d, and 13e are not fixed to the ground 20.

Next, the operation of the tsunami countermeasure structure 1 when a tsunami strikes will be described.
4 is a diagram showing the operation of the tsunami countermeasure structure 1 when a tsunami strikes, FIG. 5 is a view taken in the direction of the arrow C1 in FIG. 4, and FIG. 6 is an enlarged view in the vicinity of the column 13a in FIG.
Furthermore, FIG. 7 is a C2 direction arrow view of FIG. 5, and FIG. 8 is a modification of FIG.

When a tsunami approaches, first, as shown in FIGS. 4 and 5, the column bodies 9a and 11a are moved in the A1 direction using a hydraulic jack or the like (not shown).
Note that the columnar bodies 9a and 11a may be freely dropped in water in the A1 direction when an emergency is required or a hydraulic jack breaks down.

  Since the connecting plates 15a and 15b are fixed to the pillars 9a and 11a, they move together with the pillars 9a and 11a in the A1 direction and sink below the water surface.

  Since the column bodies 13a, 13b, 13c, 13d, and 13e are restricted by the connecting plates 15a and 15b from moving in the vertical direction beyond the length of the slit, they also move in the A1 direction and sink below the water surface. To the bottom.

  Here, as shown in FIG. 6, since the widths of the slits 27a, 27b, 29a, 29b of the column bodies 13a, 13b are wider than the widths of the connecting plates 15a, 15b, the column bodies 13a, 13b are slit by a difference in width. It is movable in the A1 and A2 directions without being restricted by 27a, 27b, 29a, and 29b.

  Therefore, the pillars 13a and 13b move in the A1 and A2 directions according to the depth regardless of the properties of the ground, and are surely grounded on the ground 20.

  Furthermore, since the front end portions 25a and 25b of the pillars 13a and 13b are conical, they penetrate into the ground 20 and are fixed to the ground 20. Therefore, the column bodies 13a and 13b do not move even when receiving the tsunami, and can surely attenuate the energy of the tsunami.

  The column bodies 13c, 13d, and 13e also move in the A1 and A2 directions according to the depth of the ground 20 and are surely penetrated into the ground 20 and fixed similarly to the column bodies 13a and 13b.

  In this way, by sinking the pillars 13a, 13b, 13c, 13d, and 13e and the connecting plates 15a and 15b into the water, as shown in FIG. It is received by 13b, 13c, 13d, 13e and connecting plates 15a, 15b, and energy is attenuated.

  Moreover, since the pillars 13a, 13b, 13c, 13d, and 13e have a columnar structure, they are smaller than the planar structure and can be quickly settled in water.

  In addition, when the tsunami leaves and the water level 19 returns to normal, 9a and 11a are moved to A2 direction of FIG. 4 and FIG. 5 using the hydraulic jack etc. which are not illustrated.

  Since the connecting plates 15a and 15b are fixed to the pillars 9a and 11a, they move together with the pillars 9a and 11a in the A2 direction and rise above the water surface.

Since the column bodies 13a, 13b, 13c, 13d, and 13e are restricted by the connecting plates 15a and 15b from moving in the vertical direction beyond the length of the slit, the connecting plates 15a and 15b are placed on the slits. It also moves in the A2 direction and rises above the water surface.
Then, the pillars 9a, 11a, 13a, 13b, 13c, 13d, 13e and the connecting plates 15a, 15b return to the state shown in FIGS.

By the way, in the tsunami countermeasure structure 1, a column is provided only on the downstream side of the bridge 3. However, as in the tsunami countermeasure structure 1a shown in FIG. 8, the columns 32a, 34a, 38a, 38b, and 38c are also provided on the upstream side. , 38d, 38e, 38f may be provided.
By adopting such a structure, the energy of the tsunami can be further attenuated.

In such a case, it is desirable to install the column bodies 13a, 13b, 13c, 13d, and 13e and the column bodies 38a, 38b, 38c, 38d, 38e, and 38f in a staggered arrangement with each other.

  With this structure, the tsunami 33 that has passed through the gaps between the pillars 13a, 13b, 13c, 13d, and 13e is received by the pillars 38a, 38b, 38c, 38d, 38e, and 38f. Energy can be attenuated.

The arrangement is not limited to the staggered arrangement, and may be a lattice arrangement.
Moreover, it is desirable to arrange each column equally.

As described above, according to the first embodiment, the tsunami countermeasure structure 1 includes the column bodies 9a, 11a, 13a, 13b, 13c, 13d, and 13e and the connection plates 15a and 15b. By moving, the pillars 13a, 13b, 13c, 13d, 13e and the connecting plates 15a, 15b are submerged in water to catch the tsunami.
Therefore, the tsunami countermeasure structure 1 is small and can operate quickly against the tsunami attack.

In addition, according to the first embodiment, the column bodies 13a, 13b, 13c, 13d, and 13e are constrained by the connecting plates 15a and 15b, but only the difference between the slit width and the width of the connecting plates 15a and 15b is free. Can move to.
Therefore, the pillars 13a, 13b, 13c, 13d, and 13e can be surely settled on the ground 20 according to the depth regardless of the properties of the ground.

Furthermore, according to the first embodiment, since the tip ends of the pillars 13a, 13b, 13c, 13d, and 13e are conical, the pillars 13a, 13b, 13c, 13d, and 13e are attached to the ground 20. When it bottoms, it penetrates into the ground 20 and is fixed.
Therefore, the pillars 13a, 13b, 13c, 13d, and 13e are difficult to move even if they receive a tsunami, and the energy of the tsunami can be surely attenuated, and damage to the pillar can be prevented.

  Next, a second embodiment will be described. FIG. 9 is a perspective view showing the tsunami countermeasure structure 35 according to the second embodiment, and FIG. 10 is a view taken in the direction of arrow E in FIG. FIG. 11 is a cross-sectional view of the column 41a.

  In addition, the same number is attached | subjected to the element which performs the function similar to the tsunami countermeasure structure 1 concerning 1st Embodiment, and description is abbreviate | omitted.

  In the tsunami countermeasure structure 35 according to the second embodiment, the inner pipe is further provided inside the pillars 41a, 41b, 41c, 41d, and 41e. It is exposed outside the body and penetrates into the ground.

  As shown in FIGS. 9 and 10, the structure of the tsunami countermeasure structure 35 is the same as that of the tsunami countermeasure structure 1, except that a column body 41a as a second column body between the column body 9a and the column body 11a, 41b, 41c, 41d, and 41e are provided.

  As shown in FIG. 11A, the column body 41a is a hollow tube body, and an inner tube 43a as a third column body is provided therein. Further, an inner tube 45a as a third column is further provided inside the inner tube 43a, and a cone-shaped tip portion 47a is provided at the tip of the inner tube 45.

The inner pipes 43a and 45a can move in the directions D1 and D2 within the column body 41a.
When the inner tube 43a and the inner tube 45a are moved in the direction D1 in the state of FIG. 11A, the inner tube 43a and the inner tube 45a are exposed to the outside of the column body 41a.

  That is, the length of the column 41a is extended by exposing the inner tube 43a and the inner tube 45a to the outside of the column 41a.

  Therefore, as compared with the column 13a according to the first embodiment, the column 41a can be shortened in the axial direction, and the column 41a obstructs the navigation of the ship passing through the river in normal times. Can be prevented.

  Note that the structures of the column bodies 41b, 41c, 41d, and 41e are the same as those of the column body 41a, and thus description thereof is omitted.

Next, the operation of the tsunami countermeasure structure 35 when a tsunami strikes will be described.
12 is a diagram showing the operation of the tsunami countermeasure structure 35 when a tsunami strikes, FIG. 13 is a view taken in the direction of arrow F in FIG. 12, and FIG. 14 is an enlarged view of the vicinity of the column body 41a in FIG.

  When the tsunami approaches, first, as shown in FIGS. 12 and 13, the column bodies 9a and 11a are moved in the direction D1 using a hydraulic jack or the like (not shown).

  Since the connecting plates 15a and 15b are fixed to the column bodies 9a and 11a, the connection plates 15a and 15b move integrally with the column bodies 9a and 11a in the D1 direction and settle below the water surface.

  Since the column bodies 41a, 41b, 41c, 41d, and 41e are restrained from moving by the connecting plates 15a and 15b, the column bodies 41a, 41b, 41c, 41d, and 41e also move in the D1 direction, sink below the water surface, and land on the ground 20.

  Here, as shown in FIG. 14, the inner pipes 43a, 43b, 45a, 45b of the column bodies 41a, 41b move in the D1 direction and are exposed from the column bodies 41a, 41b. And the front-end | tip parts 47a and 47b penetrate the ground 20, and the column bodies 41a and 41b are fixed to the ground.

Since the operations of the column bodies 41c, 41d, and 41e are the same as those of the column bodies 41a and 41b, description thereof is omitted.
When a tsunami strikes, the pillars 41a, 41b, 41c, 41d, and 41e receive the tsunami and attenuate the energy of the tsunami, as in the first embodiment.

As described above, according to the second embodiment, the tsunami countermeasure structure 35 includes the column bodies 41a, 41b, 41c, 41d, 41e and the connection plates 15a, 15b, and by moving the column bodies 9a, 11a, The column bodies 41a, 41b, 41c, 41d, 41e and the connecting plates 15a, 15b are submerged in water to catch the tsunami.
Therefore, the same effects as those of the first embodiment are obtained.

Further, according to the second embodiment, the inner pipe is provided inside the pillars 41a, 41b, 41c, 41d, and 41e, and the inner pipe is exposed to the outside when it sinks in water.
Therefore, the axial lengths of the column bodies 41a, 41b, 41c, 41d, and 41e can be shortened, and the column bodies can be prevented from obstructing the navigation of the ship passing through the river in normal times.

  In addition, according to the second embodiment, the length of the column body with respect to the ground fluctuation is adjusted by the exposed length of the inner pipe, so that the same as in the first embodiment without providing a slit. The effect of.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

Perspective view showing tsunami countermeasure structure 1 B direction arrow view of FIG. Cross-sectional view of the column 13a Diagram showing the operation of the tsunami countermeasure structure 1 when a tsunami strikes C1 direction arrow view of FIG. Enlarged view of the vicinity of the column 13a in FIG. C2 direction arrow view of FIG. Modification of FIG. Perspective view showing the tsunami countermeasure structure 35 E direction arrow view of FIG. Sectional view of the column 41a Diagram showing the operation of the tsunami countermeasure structure 35 when a tsunami strikes F direction arrow view of FIG. Enlarged view of the vicinity of the column 41a in FIG.

Explanation of symbols

1 ………… Tsunami countermeasure structure 3 ………… Bridge 5a ……… Bridge pier 7a ……… Groove portion 9a ……… Column 11a …… Column 13a …… Column 15 ……… Column 17 ………… Anti-blur 20 ……… Ground 23a …… Main body 25a …… Tip 27a …… Slit 29a …… Slit 35 ……… Tsunami countermeasure structure 37a …… Column 43a …… Inner tube 45a …… Outer tube

Claims (10)

A pair of first columns provided on a bridge provided on the water and movable in a vertical direction;
A second pillar body provided between the pair of first pillar bodies and having a slit;
A connecting plate provided by being inserted through the slit of the second pillar, and having both ends fixed to the pair of first pillars;
Consists of
A tsunami countermeasure structure characterized in that the second pillar body and the connecting plate are submerged in water by lowering the pair of first pillar bodies.   The tsunami countermeasure structure according to claim 1, wherein a plurality of the second pillars are provided between the pair of first pillars.   2. The tsunami countermeasure structure according to claim 1, wherein the second columnar body has a tip portion having an angle with respect to an axial direction of the columnar body.   The tsunami countermeasure structure according to claim 1, wherein the second column has a plurality of tip portions.   2. The tsunami countermeasure structure according to claim 1, wherein the pair of the first pillar body, the second pillar body, and the connecting plate are provided on both side surfaces of the bridge.   6. The tsunami countermeasure structure according to claim 5, wherein a plurality of the second pillars are provided in a staggered arrangement on both side surfaces of the bridge.   The second column body is a tubular body, and a third column body is movably provided therein. When the second column body sinks in water, the third column body is the first column body. The tsunami countermeasure structure according to claim 1, wherein the structure is exposed to the outside of the two column bodies.   8. The tsunami countermeasure structure according to claim 7, wherein the third column body has a shape in which a shape of a tip end portion has an angle with respect to an axial direction of the column body.   The tsunami countermeasure structure according to claim 7, wherein the third pillar body has a plurality of tip portions.   The tsunami countermeasure structure according to claim 7, wherein a plurality of the third pillars are provided inside the second pillars.

Images