JP6884912B1 - Embankment reinforcement structure using PC sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a levee reinforcement structure using a PC sheet pile capable of preventing corrosion due to water in the ground and maintaining the proof stress of the levee against floods for a long period of time. SOLUTION: The embankment reinforcement structure is provided with a PC sheet pile 11 formed by using prestressed concrete, and the upper portion of the PC sheet pile 11 is arranged inside an earth embankment 12 provided on the upper side of the foundation ground 13. Therefore, the lower portion of the PC sheet pile 11 is embedded and fixed in the foundation ground 13. The PC sheet pile 11 fixed as described above and provided in the ground of the embankment 12 and the foundation ground 13 is characterized in that the PC sheet pile 11 is arranged along the extending direction of the embankment 12. [Selection diagram] Fig. 2

Description

The present disclosure relates to a levee reinforcement structure using a PC sheet pile to reinforce a levee constructed on a river or coast.

When placing sheet piles on the ground to reinforce embankments, for example, if sheet piles made of general concrete are used, for example, cracks will occur over time and the strength will decrease, so sheet piles made of steel will be used. Is the mainstream to use as a reinforcing material.
When the embankment is reinforced by using the sheet pile, for example, a structure is used in which a row of sheet piles is driven into the foundation ground and buried inside the embankment (see, for example, Patent Document 1).
In addition, as a structure to reinforce the embankment, there is a structure in which sheet piles are placed in two rows along the extension direction of the embankment and buried inside the embankment, and further, between the upper ends of the sheet piles arranged in two rows. There is a structure in which the strength against movement of earth and sand is increased by connecting with a girder (tie member or the like) (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2020-16107 Japanese Unexamined Patent Publication No. 2019-210777

The sheet piles used to reinforce the embankment will be driven into the foundation ground and buried underground.
Therefore, when a sheet pile formed of steel is used to reinforce an embankment, it is inevitable that it comes into contact with underground moisture such as rainwater or seepage water, and these moisture causes corrosion.
As the corrosion of sheet piles progresses in structures such as embankments, the strength of the corroded part or its surroundings decreases. That is, it becomes difficult to secure the bearing capacity of the embankment or the like for a long period of time.

In addition, the above-mentioned underground moisture exists in various amounts depending on the surrounding topography and geology, and changes with the passage of time. Therefore, it becomes difficult to predict the degree of corrosion of steel materials buried in the ground.
That is, when a sheet pile made of steel is used to reinforce an embankment, it is difficult to predict when it will be necessary to inspect or repair underground structures after the embankment is installed, which is safe. If you place importance on, the period until inspection or repair is required will be set short.
In addition, it is not easy to inspect or repair sheet piles buried in the ground.

In addition, the surface of the steel material is smoothed so that there are no minute defects where rust is likely to occur.
Therefore, the sheet pile formed of steel has little friction when it comes into contact with earth and sand, and when the topography changes over time, it is unlikely to be deformed together with the earth and sand forming the embankment, etc. With the change, the structure such as the embankment is likely to be damaged.

This disclosure is made to solve the above-mentioned problems, and is a levee reinforcement structure using a PC sheet pile that can prevent corrosion due to underground moisture and maintain the proof stress of the levee against floods for a long period of time. provide.

The embankment reinforcement structure using the PC sheet pile according to the present disclosure is formed by using prestressed concrete, the upper part is arranged inside the embankment provided on the upper side of the foundation ground, and the lower part is the foundation. The PC sheet piles to be embedded in the ground are provided, and the PC sheet piles are arranged in a row along the extending direction of the embankment.

Further, the embankment reinforcement structure using the PC sheet pile according to the present disclosure is formed by using prestressed concrete, and the upper portion is arranged inside the embankment provided on the upper side of the foundation ground, and the lower portion is The PC sheet piles to be embedded in the foundation ground are provided, and the PC sheet piles are arranged in two rows along the extending direction of the embankment.

Further, it is characterized in that it is provided with a tie member connected to each upper portion of the PC sheet piles arranged in the two rows.

Further, the PC sheet piles arranged in the two rows are characterized in that the side surface portion that comes into contact with the earth and sand is provided with a rough surface portion that generates a frictional force when the PC sheet pile comes into contact with the earth and sand.

According to the present disclosure, it is possible to prevent corrosion even if it is installed in the ground where there is a lot of moisture, and it is possible to maintain the proof stress against floods for a long period of time.

It is a perspective view which shows the overview of the sheet pile used for the embankment reinforcement structure using the PC sheet pile according to Embodiment 1 of this disclosure. It is explanatory drawing which shows the schematic structure of the embankment reinforcement structure using the PC sheet pile according to Embodiment 1 of this disclosure. It is explanatory drawing which shows the schematic structure of the embankment reinforcement structure using the PC sheet pile according to Embodiment 2 of this disclosure. It is explanatory drawing which shows the schematic structure of the embankment reinforcement structure using the PC sheet pile according to Embodiment 3 of this disclosure. It is explanatory drawing which shows the schematic structure of the embankment reinforcement structure using the PC sheet pile according to Embodiment 4 of this disclosure.

Hereinafter, embodiments of the present invention will be described.
(Embodiment 1)
FIG. 1 is a perspective view showing an overview of the sheet pile 1 used in the embankment reinforcement structure using the PC sheet pile according to the first embodiment of the present disclosure.

The sheet pile 1 is formed by using prestressed concrete (hereinafter referred to as PC), and when viewed from the upper end portion 2 or the lower end portion 3 side, for example, the sheet pile 1 has a corrugated shape as shown in the sheet pile 1 of FIG. 1 (a). Is formed in. In other words, the sheet pile 1 is formed by connecting a plurality of webs and flanges on the side surface portion 4 to improve the proof stress against an external force. The sheet pile 1 using a PC is not limited to the above shape, and may have sufficient strength. For example, as in the sheet pile 1 of FIG. 1B, the side surface portion 4 is made flat. It may be formed, or a plurality of vertically extending grooves may be formed on the side surface portion 4 as in the sheet pile 1 of FIG. 1 (c).
Since the sheet pile 1 is formed by using a PC, there is no occurrence of cracks or the like, or the occurrence of cracks is very small as compared with general concrete, and the sheet pile 1 maintains a constant strength for a long period of time. It is possible. Further, when it comes into contact with moisture, oxidative corrosion does not easily occur unlike steel materials, and the strength does not decrease.

FIG. 2 is an explanatory view showing a schematic configuration of the embankment reinforcing structure 10 according to the first embodiment of the present disclosure.
FIG. 2 shows, for example, a cross-sectional structure of an embankment (having an embankment reinforcing structure 10) provided along a river or a coastline, orthogonal to the extending direction.
In the figure, the left side is the embankment land 100 where rivers and the like exist, and the right side is the levee land 101 where residential areas and agricultural land exist.

The embankment reinforcing structure 10 of FIG. 2 uses a PC as in the sheet pile 1 of FIG. 1, and includes a sheet pile 11 formed in the same shape as the sheet pile 1.
The embankment reinforcement structure 10 is provided with, for example, an embankment 12 formed by embankment on the upper side of the foundation ground 13.
In the embankment reinforcement structure 10, sheet piles 11 are arranged in a row along the extending direction of the embankment, and the lower end portion of the sheet pile 11 (the portion corresponding to the lower end portion 3 shown in FIG. 1) is embedded in the foundation ground 13. It has been placed in.

The sheet pile 11 has a side surface portion (a portion corresponding to the side surface portion 4 in FIG. 1) not shown in FIG. 2 arranged along the extending direction of the embankment and reaches the foundation ground 13 vertically from the upper side of the embankment 12. It is cast like.
The upper end portion (the portion corresponding to the upper end portion 2 in FIG. 1) of the sheet pile 11 is arranged inside the embankment 12. That is, the sheet pile 11 is entirely buried in the ground of the embankment 12 and the foundation ground 13.
For the placement of the sheet pile 11, for example, a construction method using a vibro hammer, a water jet construction method, a construction method using a vibro hammer and a water jet in combination, etc. are used, and are suitable for the ground conditions at the position where the sheet pile 11 is installed. It is advisable to adopt the construction method.

As described above, the sheet pile 11 is formed by using a PC, that is, delicate high-strength concrete, and is subjected to a prestress method. Therefore, the occurrence of cracks is sufficiently suppressed, and it has high resistance to oxidative corrosion and the like. Further, the sheet pile 11 makes it possible to reduce the environmental load by using inorganic concrete (PC). Further, as compared with the steel material, the coefficient of friction when it comes into contact with the earth and sand is large, and the position of the earth and sand is well fixed.
That is, the sheet pile 11 can sufficiently suppress the occurrence of cracks and corrosion even when it is buried in the ground to reinforce the embankment, and the yield strength of the structure such as the embankment is maintained for a long period of time. It is possible to do.

As described above, in the embankment reinforcing structure 10, sheet piles 11 are arranged in a row in the ground of the embankment and are driven into the foundation ground 13. That is, the sheet pile 11 constitutes the embankment reinforcing structure 10 as a self-supporting sheet pile.
In the embankment reinforcement structure 10, since the sheet pile 11 is self-supporting on the foundation ground 13, floods occur in rivers and the like existing in the embankment outer land 100, overflow the embankment and flow into the levee land 101, and the embankment 12 and the like. Even when the earth and sand collapse, the self-supporting sheet pile 11 can support the earth and sand such as the earth embankment 12 against the above-mentioned overflow to prevent the embankment from breaking.
Further, even if a flood occurs in a river or the like existing in the outer land 100 and erodes the earth and sand of the embankment 12, the self-supporting sheet pile 11 can prevent the erosion.

(Embodiment 2)
FIG. 3 is an explanatory view showing a schematic configuration of the embankment reinforcing structure 20 according to the second embodiment of the present disclosure.
FIG. 3 shows, for example, a cross section of an embankment (having an embankment reinforcing structure 20) provided along a river or a coastline, orthogonal to the extending direction.
In FIG. 3, the same reference numerals are used for the portions equivalent to or corresponding to those shown in FIG.

The embankment reinforcing structure 20 of FIG. 3 uses a PC as in the sheet pile 1 and the like of FIG. 1, and includes a sheet pile 21 and a sheet pile 22 formed in the same shape as the sheet pile 1 and the like.
In the embankment reinforcement structure 20, sheet piles 21 and sheet piles 22 are installed side by side in two rows along the extending direction of the embankment.
Specifically, the sheet pile 21 and the sheet pile 22 have the side surface portion of the sheet pile 21 (the portion corresponding to the side surface portion 4 in FIG. 1) and the side surface portion of the sheet pile 22 (the portion corresponding to the side surface portion 4 in FIG. 1) facing each other. They are lined up in two rows.
Further, the sheet piles 21 and the sheet piles 22 arranged in two rows are installed, for example, at intervals inside the width of the upper end surface of the embankment (the upper end portion of the earth embankment 12).

The sheet pile 21 and the sheet pile 22 are arranged so that their side surfaces are arranged along the extending direction of the embankment, and are driven so as to reach the foundation ground 13 vertically from the upper side of the embankment 12.
Specifically, the sheet pile 21 and the sheet pile 22 are cast so that the lower end portions (the portions corresponding to the lower end portion 3 in FIG. 1) are embedded in the foundation ground 13.
Further, each upper end portion (a portion corresponding to the upper end portion 2 in FIG. 1) of the sheet pile 21 and the sheet pile 22 is arranged inside the embankment 12. That is, the sheet pile 21 and the sheet pile 22 are entirely buried in the ground of the embankment 12 and the foundation ground 13.
It is preferable to adopt the same construction method as the sheet pile 11 and the like described above for placing the sheet pile 21 and the sheet pile 22.

The sheet pile 21 and the sheet pile 22 are formed by using a PC as described above, and like the sheet pile 11, cracks and corrosion are sufficiently suppressed even when they are buried in the ground to reinforce the embankment. It is possible to maintain the bearing capacity of structures such as embankments for a long period of time. Further, the sheet pile 21 and the sheet pile 22 can reduce the environmental load by using inorganic concrete (PC). Further, as compared with the steel material, the friction coefficient when it comes into contact with the earth and sand is large, and the position of the earth and sand is well fixed.

As described above, in the embankment reinforcing structure 20, the sheet piles 21 and the sheet piles 22 are arranged in two rows and placed on the foundation ground 13 in the ground where the embankment is installed. That is, the sheet pile 21 and the sheet pile 22 form the embankment reinforcing structure 20 as a self-supporting double sheet pile.
Further, in the embankment reinforcing structure 20, earth and sand are sandwiched between the sheet piles 21 and the sheet piles 22 arranged side by side in two rows.
The earth and sand sandwiched between the sheet pile 21 and the sheet pile 22 is constrained by the sheet pile 21 and the sheet pile 22 in the horizontal deformation. That is, the earth and sand sandwiched between the sheet pile 21 and the sheet pile 22 behaves as an integral structure with the sheet pile 21 and the sheet pile 22.
Therefore, even if a flood occurs in a river or the like existing in the levee outer land 100, overflows the levee and flows into the levee land 101, and the earth and sand of the levee 12 or the like collapses, the sheet pile 21, sheet pile 22, The structure composed of earth and sand sandwiched between the sheet pile 21 and the sheet pile 22 can maintain its shape and the like without collapsing. That is, when a flood occurs, the sheet pile 21, the sheet pile 22, and the earth and sand sandwiched between them (by the above structure) support the earth and sand such as the embankment 12 against the above overflow and break the bank. Can be prevented.
Further, even if a flood occurs in a river or the like existing in the outer land 100 and erodes the earth and sand of the embankment 12, the self-supporting sheet pile 21 can prevent the erosion.

(Embodiment 3)
FIG. 4 is an explanatory view showing a schematic configuration of the embankment reinforcement structure 30 according to the third embodiment of the present disclosure.
FIG. 4 shows, for example, a cross section of an embankment (having an embankment reinforcing structure 30) provided along a river or a coastline, orthogonal to the extending direction.
Note that FIG. 4 uses the same reference numerals for parts equivalent to or corresponding to those shown in FIGS. 2 and 3.

The embankment reinforcing structure 30 of FIG. 4 includes a sheet pile 31 and a sheet pile 32 formed in the same shape as the sheet pile 11 and the like by using a PC in the same manner as the sheet pile 1 and the like described above. The sheet pile 31 and the sheet pile 32 can reduce the environmental load by using inorganic concrete (PC). Further, as compared with the steel material, the coefficient of friction when it comes into contact with the earth and sand is large, and the position of the earth and sand is well fixed.
In the embankment reinforcement structure 30, sheet piles 31 and sheet piles 32 are arranged in two rows along the extending direction of the embankment.
The sheet pile 31 and the sheet pile 32 are arranged in two rows with their side surface portions (portions corresponding to the side surface portion 4 in FIG. 1) facing each other, similarly to the sheet pile plate 21 and the sheet pile plate 22 described above.
Further, the sheet piles 31 and the sheet piles 32 arranged in two rows are installed, for example, at intervals inside the width of the upper end surface of the embankment (the upper end portion of the earth embankment 12).

The sheet pile 31 and the sheet pile 32 are arranged so that each side surface portion of the sheet pile 31 and the sheet pile 32 is parallel to the extending direction of the embankment. Further, the sheet pile 31 and the sheet pile 32 are driven so as to reach the foundation ground 13 vertically from the upper side of the embankment 12.
Specifically, the sheet pile 31 and the sheet pile 32 are cast so that their lower ends (corresponding to the lower end 3 in FIG. 1) are embedded in the foundation ground 13.
Further, each upper end portion (a portion corresponding to the upper end portion 2 in FIG. 1) of the sheet pile 31 and the sheet pile 32 is arranged inside the embankment 12. That is, the sheet pile 31 and the sheet pile 32 are entirely buried in the ground of the embankment 12 and the foundation ground 13.
It is preferable to adopt the same construction method as the sheet pile 11 and the like described above for placing the sheet pile 31 and the sheet pile 32.

The embankment reinforcing structure 30 is connected between the upper end portion of the sheet pile 31 and the upper end portion of the sheet pile portion 32 by a tie member 33. That is, the sheet pile 31 and the sheet pile 32 form a levee reinforcement structure 30 as a tie-type double sheet pile whose upper end is connected and fixed by a tie member 33.
The tie member 33 is made of a material having a property of being hard to stretch and is subjected to surface treatment or the like to prevent corrosion due to moisture, or has the above-mentioned properties and does not corrode even when exposed to moisture (precast). It is made of a material (such as concrete).
The tie members 33 are installed at a plurality of locations at appropriate intervals in the extending direction of the sheet pile 31 and the sheet pile 32.
The tie member 33 is directly attached and fixed to the upper end portion of the sheet pile 31 and the upper end portion of the sheet pile 32. The tie member 33 may be attached and fixed to each of the upper end portions of the above using a precast concrete raising material or the like.

Since the lower end of the sheet pile 31 and the sheet pile 32 is embedded in the foundation ground 13 and the upper end is connected by the tie member 33 as described above, the distance between the sheet pile 31 and the sheet pile 32 is at both ends in the vertical direction. It is kept constant.

In the embankment reinforcing structure 30, earth and sand are sandwiched between the sheet piles 31 and the sheet piles 32 arranged side by side in two rows.
The earth and sand sandwiched between the sheet pile 31 and the sheet pile 32 is constrained by the sheet pile 31 and the sheet pile 32 in the horizontal deformation. That is, the earth and sand sandwiched between the sheet pile 31 and the sheet pile 32 in which the distance between the upper and lower ends is fixed acts as a structure integrated with the sheet pile 31 and the sheet pile 32.
Therefore, even if a flood occurs in a river or the like existing in the levee outer land 100, overflows the levee and flows into the levee land 101, and the earth and sand of the levee 12 or the like collapses, they are connected by the tie member 33. The sheet pile 31 and the sheet pile 32, and the structure composed of the earth and sand sandwiched between them can maintain the shape and the like without collapsing. That is, when a flood occurs, the sheet pile 31 and the sheet pile 32 connected by the tie member 33, and the earth and sand sandwiched between them (by the above structure), the embankment 12 and the like against the above overflow. It is possible to support the earth and sand of the bank and prevent the bank from breaking.
Further, even if a flood occurs in a river or the like existing in the outer land 100 and erodes the earth and sand of the embankment 12, the self-supporting sheet pile 31 can prevent the erosion.

(Embodiment 4)
FIG. 5 is an explanatory view showing a schematic configuration of the embankment reinforcing structure 40 according to the fourth embodiment of the present disclosure.
FIG. 5 shows, for example, a cross section of an embankment (having an embankment reinforcing structure 40) provided along a river or a coastline, orthogonal to the extending direction.
In FIG. 5, the same reference numerals are used for the portions equivalent to or corresponding to those shown in FIGS. 2 to 4.

The embankment reinforcing structure 40 of FIG. 5 includes a sheet pile 41 and a sheet pile 42 formed in the same shape as the sheet pile 1 and the like by using a PC as in the above-mentioned sheet pile 1 and the like. The sheet pile 41 and the sheet pile 42 can reduce the environmental load by using inorganic concrete (PC). Further, as compared with the steel material, the coefficient of friction when it comes into contact with the earth and sand is large, and the position of the earth and sand is well fixed.
In the embankment reinforcement structure 40, the sheet pile 41 and the sheet pile 42 are installed side by side in two rows along the extending direction of the embankment.
The sheet pile 41 and the sheet pile 42 are arranged in two rows with their side surface portions (portions corresponding to the side surface portion 4 in FIG. 1) facing each other, similarly to the sheet pile plate 21 and the sheet pile plate 22 described above.
Further, the sheet piles 41 and sheet piles 42 arranged in two rows are installed, for example, at intervals inside the width of the upper end surface of the embankment (the upper end portion of the earth embankment 12).

The sheet pile 41 and the sheet pile 42 are arranged so that each side surface portion of the sheet pile 41 and the sheet pile 42 is parallel to the extending direction of the embankment, and is placed so as to reach the foundation ground 13 vertically from the upper side of the embankment 12. ing.
Specifically, the sheet pile 41 and the sheet pile 42 are cast so that their lower ends (corresponding to the lower end 3 in FIG. 1) are embedded in the foundation ground 13.
Further, each upper end portion (a portion corresponding to the upper end portion 2 in FIG. 1) of the sheet pile 41 and the sheet pile 42 is arranged inside the embankment 12. That is, the sheet pile 41 and the sheet pile 42 are entirely buried in the ground of the embankment 12 and the foundation ground 13.
It is preferable to adopt the same construction method as the sheet pile 11 and the like described above for placing the sheet pile 41 and the sheet pile 42.

The sheet pile 41 and the sheet pile 42 are provided with a rough surface portion 43 on one side of a side surface portion, for example. The sheet pile 41 and the sheet pile 42 illustrated in FIG. 5 are provided with a rough surface portion 43 on one side surface of the side surface portion. Further, a rough surface portion 44 is provided on one side surface of the other side.
In the embankment reinforcing structure 40 of FIG. 5, the sheet pile 41 and the sheet pile 42 are arranged and fixed so that the side surface portions provided with the rough surface portions 43 face each other.
The rough surface portion 43 is a portion formed with a coarse surface having an appropriate size so that, for example, when the earth and sand forming the embankment 12 and the like come into contact with each other, a frictional force is generated between the rough surface portion 43 and the earth and sand.
The rough surface portion 43 is installed at a position where the sheet pile 41 and the sheet pile 42 come into contact with the earth and sand of the embankment 12 provided on the upper side of the foundation ground 13 when the sheet pile 41 and the sheet pile 42 are driven into the foundation ground 13.
The rough surface portion 44 is a portion having a rough surface similar to that of the rough surface portion 43, and when the sheet pile 41 and the sheet pile 42 are driven into the foundation ground 13, the rough surface portion 44 of the sheet pile 41 is the soil on the side of the embankment outer land 100. The rough surface portion 44 of the sheet pile 42 is installed so as to come into contact with the earth and sand forming the embankment 12 and the like, and to come into contact with the earth and sand forming the embankment 12 and the like on the inner land 101 side of the embankment.

In the embankment reinforcing structure 40, earth and sand are sandwiched between the sheet piles 41 and the sheet piles 22 arranged side by side in two rows.
Horizontal deformation of the earth and sand sandwiched between the sheet pile 41 and the sheet pile 42 is restrained by the sheet pile 41 and the sheet pile 42.
That is, the earth and sand sandwiched between the sheet pile 41 and the sheet pile 42 are in contact with the rough surface portion 43 provided on the sheet pile 41 and the rough surface portion 43 provided on the sheet pile 42, and slide on the surface of the sheet pile 41. The movement is suppressed (prevented), and similarly, the sliding movement on the surface of the sheet pile 42 is suppressed (prevented).
The earth and sand sandwiched between the sheet pile 41 and the sheet pile 42 does not slip on the surfaces of the sheet pile 41 and the sheet pile 42 as described above (sliding movement is suppressed), and becomes an integrated structure. Behave.
When the sheet pile 41 and the rough surface portion 44 provided on the sheet pile 42 come into contact with the earth and sand forming the embankment 12, friction occurs as described above, and there is a function of suppressing the collapse of the embankment 12.

Therefore, even if a flood occurs in a river or the like existing in the levee outer land 100, overflows the levee and flows into the levee land 101, and the earth and sand of the levee 12 or the like collapses, the sheet pile 41 and the sheet pile 42, In addition, the structure composed of earth and sand sandwiched between them can maintain its shape and the like without collapsing. That is, when a flood occurs, the sheet pile 41 and the sheet pile 42, and the earth and sand sandwiched between them (by the above structure) support the earth and sand such as the embankment 12 against the above overflow and break the bank. Can be prevented.
Further, even if a flood occurs in a river or the like existing in the outer land 100 and erodes the earth and sand of the embankment 12, the self-supporting sheet pile 41 can prevent the erosion.

The sheet pile 41 and the sheet pile 42 illustrated in FIG. 5 form the embankment reinforcing structure 40 as a self-supporting double sheet pile, similarly to the sheet pile 21 and the sheet pile 22 of FIG. 3, but the sheet pile 31 and the sheet pile shown in FIG. 4 are formed. Similar to 32, the upper end portion may be connected and fixed by a tie member 33 or the like to form the embankment reinforcing structure 40 as a tie type double sheet pile. In other words, it is also possible to provide the rough surface portion 43 on the sheet pile 31 and the sheet pile 32 of FIG.
Further, the sheet pile 41 and the sheet pile 42 illustrated in FIG. 5 are provided with the rough surface portion 43 and the rough surface portion 44 on both sides of the side surface portion, but the rough surface portion 43 or the rough surface portion 44 is provided only on one side surface of the side surface portion. May be.

The sheet piles 11,1,1,22,31,32,41,42 exemplified here are all formed by using a PC.
By using a PC, these sheet piles have thicker members and higher rigidity than sheet piles made of steel. Therefore, the deformation that occurs when water overflows the embankment is smaller than when steel is used, and it is possible to firmly prevent the embankment from breaking when a flood occurs.
In addition, since each of the above sheet piles does not corrode even if it comes into contact with moisture in the ground due to the use of a PC, it has a higher resistance to floods than when steel is used to reinforce the embankment. It can be maintained for a long period of time and the durability of the embankment can be improved. That is, since it is maintenance-free, it is possible to suppress the cost related to the maintenance of the embankment in the long term.

Further, the main construction of the embankment reinforcing structure 10, the embankment reinforcing structure 20, the embankment reinforcing structure 30, and the embankment reinforcing structure 40 is to drive a sheet pile formed by a PC. That is, when constructing the embankment reinforcing structures 10 to 40, it is not necessary to perform (large-scale) remodeling of the existing embankment or construction to close the river, and it is possible to suppress the construction cost. In addition, the construction period can be set throughout the year, not limited to the dry season.

1,11,1,2,22,31,32,41,42 Sheet pile 2 Upper end 3 Lower end 4 Side 10 Embankment reinforcement structure 12 Embankment 13 Foundation ground 20 Embankment reinforcement structure 30 Embankment reinforcement structure 33 Tie member 40 Embankment reinforcement structure 43,44 Rough surface 100 Outer embankment 101 Inner embankment

Claims (2)

It is formed using prestressed concrete, which has a higher friction coefficient when it comes into contact with earth and sand than steel, and the upper part is arranged inside the embankment formed on the upper side of the foundation ground of the embankment, and the lower part is the above. PC sheet piles embedded in the foundation ground is disposed in two rows along the extending direction of the embankment,
The PC sheet pile
The side surface is formed on either a corrugated surface, a flat surface, or a surface having a plurality of grooves extending in the vertical direction.
On both sides or one side of the side surface portion, a rough surface portion having a coarse surface having a size that causes a frictional force for suppressing the sliding movement of the earth and sand when it comes into contact with the earth and sand forming the embankment is provided.
Embankment reinforcement structure using PC sheet piles. A tie member connected to the upper portion of the PC sheet piles arranged in the two rows.
The embankment reinforcement structure using the PC sheet pile according to claim 1.

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