JP5882438B1 - Seawall - Google Patents

Abstract

[PROBLEMS] To realize a seawall that can withstand an earthquake and a tsunami that strikes after the earthquake. A tide embankment 100 that is firmly integrated with the ground by a plurality of pile members 20 embedded in a base layer G2 has a strength capable of withstanding a huge earthquake, and a pile caused by a tsunami that strikes after the earthquake. By providing the steel sheet pile wall 10 that prevents the periphery of the material 20 from being scoured and the net-like members 60 and 60a composed of a plurality of strips 6 that can attenuate the wave force of the tsunami, It is designed to have the strength to function as a dyke against a tsunami that strikes after a powerful destructive force is applied. [Selection] Figure 1

Description

  The present invention relates to a seawall.

In general, existing levee bodies such as dykes, breakwaters, and tide embankments are structures that are concretely coated on the embankment surface at the shores or rivers, and that are resistant to external pressure by their own weight. Yes, it is simply placed on the sand or clay surface.
Such a dam body has sufficient strength against shear strain, such as internal sediment flowing out due to non-uniform settlement due to liquefaction that occurs on the surface ground during an earthquake, and damage such as cracks in concrete. It ’s hard to say. In addition, the tsunami that hit afterwards caused the internal earth and sand to be easily washed away by the waves that invaded from the damaged part of the concrete, and there was a possibility that it could not function as a levee body.

  On the other hand, the technique of protecting a shore and a bank protection by reducing wave power using a net-like wave-dissipating structure is known (for example, refer to Patent Documents 1 and 2).

JP 2007-217959 A Japanese Utility Model Publication No. 56-87517

Since the wave-dissipating structures of Patent Documents 1 and 2 are lightweight and simple in structure, it is considered that when applied to the construction of a wave breaker, it contributes to a reduction in work period and cost compared to the prior art.
However, in Patent Document 1, since the wave-dissipating structures are simply arranged on the water-permeable sheet laid on the ground surface to prevent scouring, the wave-dissipating structures arranged due to unequal subsidence due to an earthquake become uneven. There is concern that it will not be able to perform its function. Moreover, there exists a possibility that the permeable sheet laid out may flow out easily by the tsunami which hits. Further, in Patent Document 2, even if the support is embedded up to the supporting ground, the lower part of the mesh fence is scoured by the tsunami that hits, and the displacement of the support becomes large, and as a wave-dissipating structure as well There is a possibility that the function cannot be maintained, and it is expected that these wave-dissipating structures cannot beat the strong tsunami wave force.

  An object of the present invention is to provide a seawall that can withstand an earthquake and a tsunami that strikes after the earthquake.

In order to solve the above problems, the invention according to claim 1 is a seawall,
A steel sheet pile wall built in the ground,
A plurality of pile members embedded continuously at a predetermined interval along the steel sheet pile wall and embedded so that a pile head is positioned at a position higher than the upper end portion of the steel sheet pile wall,
A lower connecting body covering the upper end of the steel sheet pile wall so as to include a part of the pile material;
An upper connecting body in which pile heads of the pile material are connected so as to be arranged substantially parallel to the lower connecting body,
A plurality of struts covering the pile material and connecting the lower connecting body and the upper connecting body,
A plurality of strips covering between the lower connector, the upper connector and the support;
It is provided with.

The invention according to claim 2 is the tide embankment according to claim 1,
The steel sheet pile wall is not embedded in the base layer.

The invention according to claim 3 is the tide embankment according to claim 1 or 2,
At least one of the upper coupling bodies is provided with a storage portion for storing the band-shaped body.

  According to the present invention, it is possible to obtain a seawall that can withstand an earthquake and a tsunami that strikes after the earthquake.

It is the top view (a) and front view (b) which show the seawall of this embodiment in partial cross section. It is sectional drawing (a) which shows a part between pillars, and front view (b) which shows an opening part. It is the top view (a) and front view (b) which show the modification of the seawall of this embodiment in partial cross section. It is explanatory drawing regarding the steel pipe penetrated by the loop formed in the edge part of the strip | belt body which comprises the net-like member of a seawall, and is sectional drawing (a) and front view (b) which expand and show a loop part. It is explanatory drawing regarding the guide part by which the loop formed in the edge part of the strip | belt-shaped body which comprises the net-like member of a seawall is movably penetrated, sectional drawing (a) which expands and shows a loop part, and a partially broken view It is a front view (b) shown.

Hereinafter, embodiments of a seawall according to the present invention will be described in detail with reference to the drawings.
The tide embankment 100 is constructed along the coastline to prevent damage from large waves and storm surges caused by typhoons, especially tsunami.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the seawall 100 of the present embodiment is formed along the steel sheet pile wall 10 constructed in the ground and the steel sheet pile wall 10. A plurality of pile members 20 continuously provided at a predetermined interval, a lower connector 30 covering the upper end portion 10a of the steel sheet pile wall 10 so as to include a part of the pile material 20, and an upper portion of the lower connector 30 An upper connecting body 40 in which the pile heads 20a of the pile members 20 are connected so as to be arranged, a plurality of columns 50 that cover the pile members 20 and connect the lower connecting body 30 and the upper connecting body 40, and a lower portion A fixed mesh member 60 and a movable mesh member 60a are provided as a plurality of belt-like bodies covering between the connector 30, the upper connector 40, and the support column 50.

The steel sheet pile wall 10 includes a steel sheet pile 1 having a pair of joints, and is a structure in which a plurality of steel sheet piles 1 are connected by connecting steel sheet pile joints.
The steel sheet pile 1 constituting the steel sheet pile wall 10 is embedded in the surface ground G1 with its upper end exposed on the ground surface, and the upper end of the steel sheet pile 1 is connected to become the upper end portion 10a of the steel sheet pile wall 10. Yes.
The steel sheet pile wall 10 need only have a function of preventing the periphery of the tide embankment 100 from being scoured by wave force, and thus does not need to be rooted into the base layer G2. Therefore, when applied to a revetment, the steel material weight can be saved and the cost can be reduced compared to the normal construction in which the steel sheet pile wall is deeply embedded. Moreover, since the surface layer communicates with the lower part of the steel sheet pile, the flow pressure can be released against the lateral flow generated in the surface layer part due to the earthquake. Therefore, since the influence which acts on a seawall can be reduced and the damage and displacement of the pile material 20 can be minimized, the function as a seawall can be maintained even if the mesh member 60 receives the wave force of the tsunami that strikes after the earthquake. Therefore, the steel sheet pile head is connected to the pile material 20 by connecting with a shape steel or the like in preparation for the settlement of the surface layer portion. Moreover, between pile materials 20, pile materials are separately embed | buried so that the steel sheet pile wall 10 may be pinched | interposed with the pile materials 20, and the head may be connected with the shape steel etc. which connected the steel sheet pile wall head. preferable.
In addition, the base layer G2 refers to a solid ground (for example, diluvial clay or gravel) that can support a structure or the like.

In order to construct the steel sheet pile wall 10, a known static load type pile press-in machine is used.
The pile press-in machine is provided at the lower part of the machine main body and clamps the existing pile, and the chuck device provided at the front end of the machine main body and holding the pile pressed into a position adjacent to the existing pile, It has. This pile press-fitting machine grabs the upper end of the existing pile with the clamp device, and with the reaction force taken from the existing pile, lowers the chuck device that holds the pile so that the pile is pressed into the ground. It has become. Moreover, this pile press-fit machine can be self-propelled on the existing pile row | line | column by making a clamp apparatus and a chuck apparatus cooperate.
In addition, since the structure and operation | movement of a pile presser are the same as that of a conventionally well-known thing, it is not explained in full detail here.

The pile material 20 is, for example, a steel pipe pile that is longer than the steel sheet pile 1, and the steel sheet pile wall 10 is positioned such that the pile head 20 a of the pile material 20 is positioned higher than the upper end portion 10 a of the steel sheet pile wall 10. It is buried deeper than. It is good to embed in the depth where the lower part of the pile material 20 reaches the basement layer G2 in the lower layer side than the surface layer ground G1.
Note that the pile material 20 may be disposed on either the front side or the rear side of the steel sheet pile wall 10. Here, the front side and the rear side correspond to the front side and the rear side of the seawall 100, for example, the front side is the sea side and the rear side is the land side.

In order to press-fit the pile material 20 into the ground, a pile press-in machine used for the construction of the steel sheet pile wall 10 can be used. Since the pile material 20 which is a steel pipe pile is preferably embedded by the rotary press-fitting method, the chuck device of the pile press-fitting machine is used by replacing it with one for rotary press-fitting.
And if the pile material 20 is embed | buried by the well-known pile press-in machine which can be self-propelled on the steel sheet pile wall 10 (steel sheet pile 1), the embedment of the pile material 20 will be continuously carried out after the steel sheet pile 1 is embed | buried. It is efficient because it can be done.

The lower coupling body 30 is a concrete structure (coping) that covers the steel sheet pile head provided on the surface layer so as to extend along the extending direction of the steel sheet pile wall 10. In addition, you may use a concrete secondary product for the lower coupling body 30. FIG.
The upper coupling body 40 is a structure made of a reinforced concrete member, a steel member such as a steel bar, a steel bar, or a steel wire provided on the pile member 20 so as to be arranged substantially parallel to the lower coupling body 30. Nylon fiber or polyethylene fiber may be used. At least one of the upper coupling bodies 40 is provided with a storage portion 4 for storing a movable mesh member 60a. The support column 50 is a reinforced concrete column body provided with the pile material 20 as a core material.
The space surrounded by the lower connecting body 30, the upper connecting body 40, and the support column 50, that is, the space 5 between the columns, is covered with mesh members 60 and 60a.

The net-like members 60, 60a are composed of a plurality of belt-like bodies 6, and are flexible members that are woven into a plain weave by replacing a plurality of longitudinal belt-like bodies 6 and a plurality of transverse belt-like bodies 6 while crossing each other. It is. The mesh members 60, 60a are woven with a gap between the longitudinal strips 6 and the lateral strips 6 and have a mesh that allows water to pass therethrough. For example, the width of the band 6 is 200 mm, and the mesh is about 100 mm square. Therefore, when the net-like members 60, 60a are partitioned by a panel such as a concrete plate, including when the tsunami has passed over the seawall, the overtopped wave returns (pulling), the height of the panel It is known that a large scour occurs on the rear side of the seawall (in front of the seawall in the case of pulling waves) because the waves fall in the form of a waterfall, but the waves leak from the mesh So this can be deterred beforehand. Therefore, the function can be maintained against repeated tsunamis. In addition, the net-like members 60 and 60a may be formed by simply overlapping the vertical belt-like body 6 and the horizontal belt-like body 6 without switching up and down.
The belt-like body 6 is a member made of a resin material such as polyethylene or nylon, and formed into an elongated cloth shape by knitting these resin fibers. As this strip | belt-shaped body 6, what has high tension | tensile_strength, such as a belt used for a substitute of a mounting wire, and a seatbelt webbing, can be used, for example.

The fixed mesh member 60 is attached so that the end portions of the belt-like body 6 are fixed to the wall surfaces of the lower connecting body 30, the upper connecting body 40, and the columns 50 and cover the inter-column space 5.
Specifically, loops formed by folding the end portions and sewing are formed at both ends of the belt-like body 6, and the fixing portions fixed to the wall surfaces of the lower connection body 30, the upper connection body 40, and the support column 50. 7 is looped with a belt-like body 6 to fix the mesh member 60 at a predetermined position.
The front end of the fixing unit 7 is formed, for example, in a substantially T shape so that the loop that is hung cannot be removed.

The movable mesh member 60 a is configured to be housed in the housing portion 4 provided in the upper coupling body 40.
The upper end side of the movable mesh member 60 a is fixed to a winding drum (not shown) in the storage unit 4, and the mesh member 60 a is wound around the winding drum so as to be stored in the storage unit 4. It has become. A storage port cover 4a is attached to the storage port of the storage unit 4 through which the movable mesh member 60a enters and exits.
On the lower end side of the movable mesh member 60a, a loop formed by folding the end of the belt-like body 6 and sewing is formed, and a pipe 8 inserted through the loop is attached.
Then, the pipe 8 of the mesh member 60a pulled down from the storage portion 4 is hooked and locked on a hook (not shown) fixed to the lower coupling body 30 like a sickle lock, so that the inter-column 5 is interspersed with the mesh member 60a. Can be covered.
Moreover, the opening part 5a can be opened in the column 5 of a tide bank by removing the pipe 8 hung on the hook, and accommodating the mesh member 60a wound up by the winding drum in the accommodating part 4. FIG. By storing the mesh member 60a in the storage portion 4 and releasing the opening 5a, it becomes possible to go back and forth between the front side and the rear side of the seawall 100. Further, by storing the mesh member 60a in the storage unit 4, deterioration due to ultraviolet rays or wind and rain can be suppressed.
Normally, the movable mesh member 60a is stored in the storage unit 4, and the winding drum is rotated in response to the occurrence of an earthquake or tsunami, and the mesh member 60a is automatically lowered to open. The part 5a may be covered.

Since the movable net member 60a is not fixed to the support column 50 at the side end, it is preferable to provide a cover 9 that covers the left and right side ends of the net member 60a closing the opening 5a.
The cover 9 is, for example, a metal lid having a substantially L-shaped cross section attached to the front surface of the support column 50. By covering the side end of the mesh member 60a with the cover 9, the installation posture of the mesh member 60a is stabilized. Can do.

As described above, the seawall 100 according to the present embodiment is firmly integrated with the ground (G1, G2) by the plurality of pile members 20 embedded in the base layer G2, so that it can withstand a huge earthquake. In addition, it has the strength to function as a dam against a tsunami that strikes after a powerful destructive force such as a huge earthquake is applied.
Moreover, since the steel sheet pile wall 10 with which the seawall 100 is equipped can prevent the surroundings of the pile material 20 from being scoured by a tsunami pushing wave or a pulling wave, the posture of the pile material 20 is stabilized. And maintain the function as a seawall.
Moreover, the steel sheet pile wall 10 can suppress the influence of the lateral flow of the surface layer ground G1 due to the earthquake, and can suppress the loosening of the ground around the seawall 100.

Moreover, the net-like members 60 and 60a of the seawall 100 can attenuate the tsunami and storm surge wave force that strikes, and can prevent drifting objects and rocks from landing.
In particular, since the mesh members 60 and 60a are flexible and flexible, they are not easily damaged by the amplitude at the time of an earthquake, and can reduce the impact caused by the collision of drifting objects or the like. Therefore, the function can be maintained even against repeated tsunamis.

The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 3 (a) and 3 (b), the tide embankment 101 in which the net-like members 60 and 60 a covering the inter-column space 5 are disposed so as to extend between the columns 50 may be used.

As shown in FIGS. 4 (a) and 4 (b), loops formed by folding the end of the belt-like body 6 and sewing are formed at both ends of the belt-like body 6 constituting the fixed mesh member 60. Steel pipes 2 are inserted through these loops.
That is, the steel pipe 2 is attached to each of the four sides of the mesh member 60, and the steel pipe 2 serves as a frame of the mesh member 60 so that the mesh member 60 has a rectangular shape.
The lower end portion of the mesh member 60 is fitted into the groove portion 30a formed in the lower coupling body 30, the upper end portion of the mesh member 60 is fitted into the groove portion 40a formed in the upper coupling body 40, and the left and right end portions of the mesh member 60 are supported on the column. The mesh member 60 is fixed between the support columns 50 so as to be fitted into the groove portion 50 a formed in 50.
In addition, the steel pipe 2 penetrated by the loop is fixed to each groove part (30a, 40a, 50a) with a hook, a volt | bolt, etc. Moreover, it is preferable that the loop (band-like body 6) and the steel pipe 2 are prevented from being displaced by screws or the like.

The upper end of the movable mesh member 60 a is fixed to a winding drum (not shown) in the storage unit 4. Moreover, the loop formed by folding the end part of the strip | belt-shaped body 6 and sewing is formed in the lower end of the longitudinal strip | belt-shaped body 6 which comprises the net-like member 60a, and the steel pipe 2 is penetrated by these loops ( (Refer FIG. 4 (a) (b)).
Further, as shown in FIGS. 5 (a) and 5 (b), the end portions of the belt-like body 6 are folded and sewn at the left and right ends of the horizontal belt-like body 6 constituting the movable mesh member 60a. Loops are formed, and these loops are inserted into the guide part 3 through the slits 3a.
The guide part 3 is a steel tubular member, and a slit 3a is formed along the longitudinal direction thereof. This guide part 3 is arrange | positioned along the pile material 20, and is provided in the groove part formed in the side surface of the support | pillar 50. As shown in FIG.
Specifically, the traction belt 3 b is inserted through the loop inserted into the guide portion 3. Further, the loop (band-like body 6) is held together with the traction belt 3b by a pair of fixing members 3c so that the loop does not come out from the slit 3a of the guide portion 3. The fixing member 3c, the belt-like body 6 and the pulling belt 3b are fixed together by screws or the like, and are slid up and down in the guide portion 3.

The mesh member 60 a configured in this way is attached so as to be able to advance and retract along the guide portion 3 provided on the side surface of the support column 50.
The opening 5 a can be covered by pulling down the mesh member 60 a from the storage portion 4. Further, the opening 5a can be released by winding the mesh member 60a by the winding drum and storing it in the storage unit 4.
In particular, since the side end portion of the mesh member 60a that advances and retreats along the guide portion 3 is held in the groove portion on the side surface of the support column 50, the cover 9 as described above may not be provided.

  Even such a seawall 101 can withstand an earthquake and a tsunami that strikes after the earthquake, and the function as a dam body can be maintained.

In the above-described embodiment, the vertical belt-like body 6 is formed as a plurality of belt-like bodies covering the space surrounded by the lower coupling body 30, the upper coupling body 40, and the column 50, that is, between the pillars 5. However, the present invention is not limited to this. For example, the belt-like body 6 only in the vertical direction or the belt-like body only in the horizontal direction is used. The column space 5 may be covered with only 6. In this case, it goes without saying that the movable mesh member 60a is limited to the belt-like body 6 only in the vertical direction.
Although the pile material 20 is a steel pipe pile, it may be a PC pile or an H steel pile, and the root portion is not a base layer G2, for example, a slit is formed on the wall surface of the steel pipe and the solidified material is pressurized and filled from inside the steel pipe. For example, it may be integrated with the ground, that is, the earth by improving the surrounding ground. Furthermore, although the pile material 20 was embedded with a predetermined interval, the present invention is not limited to this.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 Steel sheet pile 2 Steel pipe 3 Guide part 4 Storage part 5 Between pillars 5a Opening part 6 Strip-like body 7 Fixing part 8 Pipe 9 Cover 10 Steel sheet pile wall 10a Upper end part 20 Pile material 20a Pile head 30 Lower connection body 40 Upper connection body 50 Prop 60 Fixed mesh member 60a Movable mesh member 100, 101 Seawall G1 Surface ground G2 Basement layer

Claims (3)

A steel sheet pile wall built in the ground,
A plurality of pile members embedded continuously at a predetermined interval along the steel sheet pile wall and embedded so that a pile head is positioned at a position higher than the upper end portion of the steel sheet pile wall,
A lower connecting body covering the upper end of the steel sheet pile wall so as to include a part of the pile material;
An upper connecting body in which pile heads of the pile material are connected so as to be arranged substantially parallel to the lower connecting body,
A plurality of struts covering the pile material and connecting the lower connecting body and the upper connecting body,
A plurality of strips covering between the lower connector, the upper connector and the support;
A tide embankment characterized by comprising   The tide embankment according to claim 1, wherein the steel sheet pile wall is not embedded in the base layer.   The tide embankment according to claim 1 or 2, wherein at least one of the upper coupling bodies is provided with a storage portion for storing the strip-shaped body.

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