JP6944807B2 - Seawall and seawall construction method - Google Patents

Description

The present invention is installed along the coastline relates to suppress the flooding of the land of the seawall or sea water for the high waves at the time of invasion of the tsunami and typhoons at the time of the earthquake seawalls and seawall construction how.

In Japan, it is an urgent task to minimize the damage caused by the tsunami caused by a large earthquake. In recent years, it has been pointed out that typhoons are becoming stronger due to global warming, and the damage caused by typhoons is becoming more serious. Seawalls installed along the coast against these natural disasters are expected as a means to prevent coastal erosion and inundation of seawater inland.

As a conventional tide embankment, Patent Document 1 describes a tide barrier constructed by inserting a lower portion of a bonded steel pipe into a hollow portion of a pile head, filling and fixing mortars, and fixing the upper portion of the bonded steel pipe in footing concrete. The embankment is disclosed. Further, in Patent Document 2, a joint steel pipe is fixed to the head of a PHC pile, a column base of a steel column embedded in footing is inserted into the joint steel pipe, and the joint steel pipe is filled with concrete to prevent tide. The bank is disclosed.

Japanese Unexamined Patent Publication No. 2000-27197 Japanese Unexamined Patent Publication No. 2007-100337

The extension distance of the Japanese coastline surrounded by the ocean is enormous, and the construction depends on the weather, so the installation and maintenance of the seawall requires a large cost and construction period, and the efficiency of the construction There has been a demand for conversion. However, in the seawall of Patent Document 1, since the step of fixing the lower part of the bonded steel pipe to the pile head and the step of fixing the upper part of the bonded steel pipe to the footing are separate steps, it takes time to construct the seawall. This led to a longer construction period. Further, in the seawall of Patent Document 2, the step of fixing the joined steel pipe to the head of the PHC pile and the column base of the steel column embedded in the footing are inserted into the joined steel pipe to fill the joined steel pipe with concrete. There was a process to do this, which led to a longer construction period.

As a tide embankment that solves such a problem, there is a so-called precast panel type tide embankment. For the precast panel type tide embankment, a tide embankment panel in which a part of the connecting member such as H steel is embedded is manufactured in advance at a factory, and the connecting member protruding from the lower end of the tide embankment panel is used as a pile installed on the coastline. It is built by fixing. The precast panel type tide embankment has excellent merits such as shortening the construction period and easy replacement of the tide embankment panel that has a problem during maintenance.

On the other hand, when constructing a structure on a pile such as a steel pipe pile or a steel pipe sheet pile, it is necessary to perform a concrete placing process (coping) involving the heads of adjacent piles even in the precast panel method. Coping may involve installation work of formwork and dismantling work, and there is a problem that the construction period is prolonged.

The present invention has been made in view of the above circumstances, and an object of the present invention is to streamline the attachment of a seawall panel to a seawall foundation and shorten the construction period.

The tide embankment of the present invention for solving the above problems is fixed on a foundation portion, a plurality of concrete blocks arranged so as to be in contact with each other in the width direction end faces, and fixed on the concrete block. , and a plurality of embankment panel disposed so that the width direction end faces contact with each other, the seawall panel includes a panel body, a portion at the bottom of the panel body so as to extend in the height direction of the panel body Is embedded, and the rest is provided with a connecting member protruding downward from the lower end of the panel main body. The tide embankment panel is characterized in that it has at least two connecting members and is fixed across both concrete blocks at a position where the concrete blocks are embedded in the main body and are in contact with each other. ..

The present invention from another viewpoint is a method for constructing a tide embankment, in which a foundation portion is installed, and a plurality of concrete blocks are arranged on the foundation portion so that end faces in the width direction are in contact with each other. The concrete block is fixed, and a plurality of tide embankment panels are arranged on the concrete block so that the end faces in the width direction are in contact with each other. A part is embedded in the lower part of the panel body so as to extend, and the rest is provided with a connecting member protruding downward from the lower end of the panel body, and among the parts of the connecting member, above the lower end surface of the panel body. The tide embankment panel is arranged at a position where the outer surface of the tide embankment is embedded in the panel main body over the entire surface and the concrete blocks are in contact with each other. It is characterized in that a tide embankment is constructed by arranging the tide embankment panel so as to straddle the concrete block and fixing the tide embankment panel and the concrete block .

According to the present invention, when the tide embankment panel is fixed to the concrete block, the tide embankment panel is fixed so as to straddle the adjacent concrete block. Panels can be connected.

According to the present invention, it is possible to improve the efficiency of attaching the tide embankment panel to the tide embankment foundation and shorten the construction period.

It is a figure which shows the schematic structure of the tide embankment which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line ABCD in FIG. FIG. 5 is a cross-sectional view taken along the line EE in FIG. It is a figure which shows the schematic structure of the tide embankment which concerns on 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along the line ABCD in FIG. It is a perspective view which shows the schematic structure of the connecting member which concerns on 2nd Embodiment of this invention. It is a front view which shows the schematic structure of the connecting member which concerns on 2nd Embodiment of this invention. It is a side view which shows the schematic structure of the connecting member which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the schematic structure of the connecting member of another shape which concerns on 2nd Embodiment of this invention. It is a front view which shows the schematic structure of the connecting member of another shape which concerns on 2nd Embodiment of this invention. It is a side view which shows the schematic structure of the connecting member of another shape which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the lower shape of a seawall panel and the upper shape of a concrete block. It is a figure which shows an example of the shape of the seawall panel. It is a figure which shows an example of the shape of the seawall panel. It is a figure which shows an example of the foundation part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<First Embodiment>
As shown in FIGS. 1 to 3, the tide embankment 1 of the first embodiment is arranged so that a plurality of steel pipe piles 2 as foundations installed along the coastline and end faces in the width direction W are in contact with each other. A plurality of concrete blocks 10 and a plurality of seawall panels 20 arranged so that end faces in the width direction W are in contact with each other are provided. The "coastline" in the present specification also includes riverbanks where seawater enters.

The seawall panel 20 is precast concrete in which a connecting member 22 for connecting the concrete block 10 and the panel main body 21 is embedded in the lower part of the panel main body 21 having a substantially rectangular parallelepiped shape. The longitudinal direction of the panel main body 21 is oriented in the vertical direction, and the panel main body 21 has a concrete structure reinforced by providing one or both of a reinforcing bar and a steel material inside. As shown in FIG. 2, in the panel main body 21 of the tide embankment panel 20 of the first embodiment, the thickness d ₁ at the lower part is thicker than _{the thickness d 2} at the upper part. The thickness of the panel body 21 may be uniform, but by the lower of the thickness d ₁ of the panel body 21 is thicker than the upper part of the thickness d _2, to raise the lower portion of the rigidity of the embankment panel 20 It is possible to improve the wave resistance.

A plurality of connecting members 22 are provided along the width direction W of the panel main body 21, a part of the connecting member 22 is embedded in the lower part of the panel main body 21, and the rest protrudes downward from the lower end of the panel main body 21. .. In the first embodiment, four connecting members 22 are provided for one seawall panel 20. In the following description, the portion of the connecting member 22 that protrudes downward from the lower end of the panel body 21 is referred to as a “connecting member protruding portion 22a”. As shown in FIG. 3, in the first embodiment, H steel is used as the connecting member 22, and the connecting member 22 is arranged so that the flange surface is parallel to the wave receiving surface of the panel body 21. The connecting member 22 is not limited to H steel, and may be a columnar member.

The concrete block 10 is precast concrete in which a pillar member 12 for connecting the steel pipe pile 2 and the block main body 11 is embedded in the lower part of the block main body 11 having a substantially rectangular parallelepiped shape. The block body 11 has a concrete structure reinforced by providing one or both of a reinforcing bar and a steel material inside. A plurality of column members 12 are provided in the width direction W according to the distance between the steel pipe piles 2, a part of the column members 12 is embedded in the lower part of the block body 11, and the rest protrudes downward from the lower end of the block body 11. There is. In the first embodiment, two pillar members 12 are embedded in one concrete block 10. In the following description, the portion of the column member 12 that protrudes downward from the block body 11 is referred to as a “column member projecting portion 12a”. As shown in FIG. 3, in the first embodiment, H steel is used as the column member 12, and the column member 12 is arranged so that the flange surface is parallel to the wave receiving surface of the panel body 21. The column member 12 is not limited to H steel, and may be a columnar member.

The column member projecting portion 12a of the concrete block 10 is in a state of being inserted into the hollow portion of the steel pipe pile 2, and the gap between the column member projecting portion 12a and the inside of the steel pipe pile 2 is filled with concrete 3. As a result, the steel pipe pile 2 and the concrete block 10 are fixed. Further, a plurality of insertion holes 13 for inserting the connecting member projecting portion 22a of the seawall panel 20 are formed in the upper part of the block main body 11. The connecting member projecting portion 22a of the seawall panel 20 is in a state of being inserted into the insertion holes 13, and the gap between the connecting member projecting portion 22a and the insertion hole 13 is filled with concrete 3. As a result, the concrete block 10 and the seawall panel 20 are fixed.

In the example shown in FIG. 1, the tide embankment panel 20 has a width of 1/2 that of the concrete block 10, and the first tide embankment panel 20a and the second tide embankment panel 20b described below are in the width direction. They are arranged alternately along W. The first tide embankment panel 20a is a tide embankment panel arranged from a position of 1/4 to a position of 3/4 of the width of the concrete block 10 when the width of the concrete block 10 is evenly divided into four. The second seawall panel 20b is arranged from a position of 3/4 of the width of the concrete block 10 in which the first seawall panel 20a is arranged to a position of 1/4 of the width of the adjacent concrete block 10. It is a seawall panel. That is, the second tide embankment panel 20b is arranged so as to straddle the block main body 11 of the two concrete blocks 10.

The tide embankment 1 of the first embodiment is configured as described above. According to such a seawall 1, the panel body 21 of each seawall panel 20 is fixed to the concrete block 10 via the connecting member 22, but the second seawall panel 20b is an adjacent concrete block. Since it is arranged so as to straddle 10, the second tide embankment panel 20b is fixed to each concrete block 10. In other words, the adjacent concrete blocks 10 are fixed to one second seawall panel 20b, whereby the position of both concrete blocks 10 in the width direction W is regulated by the second seawall panel 20b. Will be. Therefore, the adjacent steel pipe piles 2, the concrete blocks 10 and the tide embankment panels 20 are connected to each other without carrying out the coping that has been previously carried out.

That is, when constructing the tide embankment 1 of the first embodiment, it is not necessary to carry out coping of the steel pipe pile 2 heads, and the formwork installation work and dismantling work at the time of coping are omitted. be able to. As a result, it is possible to shorten the construction period required for the construction of the seawall 1. Further, since the tide embankment 1 has a structure in which the tide embankment panel 20 is fixed straddling the adjacent concrete block 10, it has a strength capable of withstanding the shaking of an earthquake that occurs before the tsunami arrives. Therefore, the wave resistance of the tide embankment is less likely to decrease due to the destruction of the tide embankment at the time of an earthquake, and the tide embankment 1 can exert its original wave resistance against the tsunami that arrives after the earthquake.

The method of constructing such a seawall 1 is as follows.

(Foundation work)
First, as a foundation work for the coast where the seawall 1 is to be installed, a plurality of steel pipe piles 2 are driven into the ground at equal intervals, for example, along the coastline. The method of driving the steel pipe pile 2 into the ground is not particularly limited.

(Installation of concrete block 10)
Next, the column member protruding portion 12a of the concrete block 10 is inserted into the hollow portion of the steel pipe pile 2, and the concrete block 10 is placed on the steel pipe pile 2 so that the widthwise end faces of the concrete block 10 are in contact with each other. .. Then, the concrete 3 is filled in the gap between the pillar member protruding portion 12a of the concrete block 10 and the inside of the steel pipe pile 2, and the concrete block 10 is fixed to the steel pipe pile 2.

(Installation of seawall panel 20)
Subsequently, the connecting member projecting portion 22a of the seawall panel 20 is inserted into the insertion hole 13 provided on the upper surface of the block body 11 of the concrete block 10, and the seawall panel 20 is placed on the concrete block 10. At this time, each tide embankment panel 20 is installed so that the above-mentioned first tide embankment panel 20a and the second tide embankment panel 20b are alternately arranged. After that, the concrete 3 is filled in the gap between the connecting member protruding portion 22a of the seawall panel 20 and the insertion hole 13 of the concrete block 10, and the seawall panel 20 is fixed to the concrete block 10. As a result, the seawall 1 is constructed.

<Second embodiment>
The tide embankment 1 of the second embodiment has a partially different configuration of the tide embankment panel 20 from the tide embankment 1 of the first embodiment, whereby the wave resistance resistance can be improved.

As shown in FIGS. 4 and 5, in the tide embankment 1 of the second embodiment, a connecting member 23 for connecting adjacent connecting members 22 is provided in a portion of the panel main body 21 in which the connecting member 22 is embedded. ing. In the examples shown in FIGS. 6 to 8, the connecting member 23 is H-steel, and is similarly assembled to the connecting member 22 which is H-steel. Further, in the examples shown in FIGS. 9 to 11, the connecting member 23 is a prismatic steel material, and a through hole 24 in the width direction W is provided in the web of the connecting member 22 which is H steel, and the connecting member 23 is provided inside the through hole 24. Is inserted. Further, the prismatic connecting member 23 may be welded to the web surface of the connecting member 22 made of H-steel, for example, without providing the through hole 24 as shown in FIGS. 9 to 11. In either case, the connecting members 22 of the seawall panel 20 are connected to each other. The tide embankment panel 20 including these connecting members 23 is manufactured in advance at a factory or the like in a state where each connecting member 22 and the connecting member 23 are assembled together with the panel main body 21.

In the tide embankment panel 20 of the second embodiment, since the adjacent connecting members 22 are integrated by the connecting member 23, the connecting force between the connecting members 22 is strengthened, and the tide embankment panel of the first embodiment is strengthened. The wave resistance can be improved with respect to 20. The shape of the connecting member 23, the method of fixing to the connecting member 22, and the like are not particularly limited as long as the adjacent connecting members 22 can be connected.

Although the first and second embodiments according to the present invention have been described above, the configuration of the seawall 1 is not limited to that described in the above embodiment. For example, in the above embodiment, concrete is formed in the gap between the hollow portion of the steel pipe pile 2 and the pillar member protruding portion 12a of the concrete block 10 and the gap between the insertion hole 13 of the concrete block 10 and the connecting member protruding portion 22a of the seawall panel 20. Although it was decided to fill with 3, mortar may be used instead of concrete 3.

Further, in the above embodiment, the shape of the block body 11 of the concrete block 10 is a rectangular parallelepiped shape, but as shown in FIG. 12, the thickness of the lower part of the panel body 21 gradually increases toward the lower end of the panel body 21, and the block body 11 The tide embankment panel 20 and the concrete block 10 may be configured so that the thickness of the upper portion of the block body 11 gradually decreases toward the upper end of the block main body 11, and the thickness of the connecting portion between the two may be continuously changed. As a result, the rigidity of the seawall 1 is increased, and the wave resistance resistance can be further improved. Further, for example, when the thickness of the connection portion between the tide embankment panel 20 and the concrete block 10 does not change continuously and has a stepped shape as shown in FIG. 2, when a wave is received by the tide embankment 1. There is a possibility that the stepped portion is selectively destroyed, but when the thickness of the connecting portion between the seawall panel 20 and the concrete block 10 changes continuously as shown in FIG. 12, such a stepped portion There is no part, and the seawall 1 is less likely to be destroyed when it receives a wave.

Further, when the tide embankment panel 20 has a width of 1/2 of the concrete block 10 as in the above embodiment, for example, as shown in FIG. 13, the width of the first tide embankment panel 20a is set to the width of the concrete block 10. Concrete in which the second tide embankment panel 20b is arranged and the first tide embankment panel 20a is arranged, arranged from the position of 1/6 to the position of 4/6 of the width of the concrete block 10 when divided into 6 evenly. It may be arranged from the position of 4/6 of the width of the block 10 to the position of 1/6 of the width of the adjacent concrete block 10. Even in such an arrangement, when fixing the tide embankment panels 20a and 20b and each concrete block 10, the second tide embankment panel 20b is fixed across the two concrete blocks 10. Therefore, the coping can be omitted and the construction period can be shortened as in the above embodiment. That is, in order to obtain the effect of omitting coping and shortening the construction period, a part of the connecting member 22 of the tide embankment panel 20 is connected to one concrete block 10 at a position where the concrete blocks 10 are in contact with each other. It is important that the concrete block 10 is fixed and the remaining connecting member 22 is fixed to the concrete block 10 adjacent to the concrete block 10.

Further, in the above embodiment, the width of the tide embankment panel 20 is halved from the width of the concrete block 10, but the width of the tide embankment panel 20 may be further shortened as shown in FIG. 14, for example. Further, the widths of the seawall panels 20 do not have to be the same. Further, the number of connecting members 22 of the seawall panel 20 and pillar members 12 of the concrete block 10 is not particularly limited. In any case, if the tide embankment panel 20 is fixed so as to straddle both concrete blocks 10 at the points where the concrete blocks 10 are in contact with each other, coping becomes unnecessary and the construction period can be shortened.

Further, in the above embodiment, the steel pipe pile 2 is used as the foundation portion of the seawall 1, but the configuration of the foundation portion is not particularly limited, and the foundation portion may be configured by the steel pipe sheet pile 2a as shown in FIG. good. Further, the method of fixing the foundation portion and the concrete block 10 is not particularly limited, and any other fixing method may be used as long as the concrete block 10 can be fixed to the upper part of the foundation portion. Similarly, the method of fixing the concrete block 10 and the tide embankment panel 20 is not particularly limited, and if the tide embankment panel 20 can be fixed so as to straddle the adjacent concrete block 10 at the upper part of the concrete block 10, other fixing is performed. May be the method

Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.

The present invention is useful as a seawall installed along the coastline. Moreover, since it can function as a retaining wall, it can also be used as a retaining wall and a seawall.

1 Seawall 2 Steel pipe pile 2a Steel pipe sheet pile 3 Concrete 10 Concrete block 11 Block body 12 Pillar member 12a Pillar member protrusion 13 Insertion hole 20 Seawall panel 20a First seawall panel 20b Second seawall panel 21 Panel body 22 Connecting member 22a Connecting member projecting portion 23 Connecting member 24 Through hole W Width direction

Claims (9)

With the foundation
A plurality of concrete blocks fixed on the foundation and arranged so that the widthwise end faces are in contact with each other.
It is provided with a plurality of seawall panels fixed on the concrete block and arranged so that their widthwise end faces are in contact with each other.
The seawall panel
With the panel body
A part is embedded in the lower part of the panel body so as to extend in the height direction of the panel body, and the rest is provided with a connecting member protruding downward from the lower end of the panel body.
Of the parts of the connecting member, the part above the lower end surface of the panel body has its outer surface fully embedded in the panel body.
A tide embankment, characterized in that the tide embankment panel has at least two of the connecting members at a location where the concrete blocks are in contact with each other and is fixed across both concrete blocks. The width of the seawall panel is 1/2 of the width of the concrete block.
When the width of the concrete block is evenly divided into four, the first tide embankment panel arranged from the position of 1/4 to the position of 3/4 of the width of the concrete block and
Having a second seawall panel arranged from a position of 3/4 of the width of the concrete block in which the first seawall panel is arranged to a position of 1/4 of the width of an adjacent concrete block. The tide embankment according to claim 1, which is characteristic. The tide embankment according to claim 1 or 2, wherein the foundation portion is a plurality of steel pipe piles driven into the ground. In the concrete block, a part of a plurality of pillar members is embedded in the lower part of the block body, and the rest protrudes below the lower end of the block body.
Claim 1 is characterized in that the pillar member is inserted into the foundation portion, and the inside of the foundation portion is filled with concrete or mortar to fix the foundation portion and the concrete block. The tide embankment according to any one of 3 to 3. The concrete block has a plurality of insertion holes for joining the seawall panels on the upper surface.
The claim is characterized in that the connecting member is inserted into the insertion hole, and the inside of the insertion hole is filled with concrete or mortar to fix the concrete block and the seawall panel. The tide embankment according to any one of Items 1 to 4. The tide embankment according to claim 5, wherein a connecting member for connecting adjacent connecting members is provided in a portion of the panel body in which the connecting member is embedded. The tide embankment according to any one of claims 1 to 6, wherein the thickness of the lower part of the tide embankment panel is thicker than the thickness of the upper part. The thickness of the lower part of the seawall panel gradually increases toward the lower end of the seawall panel.
The feature is that the thickness of the upper part of the concrete block gradually decreases toward the upper end of the concrete block, and the thickness continuously changes at the connection portion between the seawall panel and the concrete block. The tide embankment according to any one of claims 1 to 7. Install the foundation and
A plurality of concrete blocks are arranged on the foundation portion so that the end faces in the width direction are in contact with each other, and the foundation portion and the concrete block are fixed.
On the concrete block, a plurality of seawall panels are arranged so that their widthwise end faces are in contact with each other.
The seawall panel
With the panel body
A part is embedded in the lower part of the panel body so as to extend in the height direction of the panel body, and the rest is provided with a connecting member protruding downward from the lower end of the panel body.
Of the parts of the connecting member, the part above the lower end surface of the panel body has its outer surface fully embedded in the panel body.
The tide embankment panel arranged at a position where the concrete blocks are in contact with each other has at least two of the connecting members, and the tide embankment panel is arranged so as to straddle both concrete blocks, and the tide embankment panel and the said A method of constructing a seawall, which comprises constructing a seawall by fixing it to a concrete block.

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