JP2011214254A - Reinforcing structure of banking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure of a banking which suppresses collapse of a slope surface of the banking due to overflow upon a flood, and degradation of a bearing force of an underground steel wall body by scouring of a ground surface, in a structure for reinforcing the banking with the underground steel wall body.SOLUTION: The underground steel wall body 2 including a steel sheet pile wall comprising steel sheet piles 3 (including steel pipe sheet piles) connected to each other is arranged within the range of a roughly top end 1c of the banking 1. The steel sheet piles 8 as diagonal braces are diagonally placed on and along the slope surface 1a inside of the dike of the banking 1 on the slope surface 1a. The steel sheet piles 8 are embedded at least in a foundation ground 5 under the banking 1 by the depth longer than the length of the slope surface 1a of the banking 1. The steel sheet piles 8 are connected to configure the diagonal steel sheet pile wall 9, and the slope surface 1a is substantially covered with the steel sheet pile wall 9.

Description

  The present invention relates to a reinforcement structure for embankments extending long along rivers, rivers such as rivers, railway embankments, roads, railways, and the like.

Conventionally, as shown in FIG. 7, the slope 1b of the left and right slopes 1a of the embankment 1 penetrates the embankment 1 in the vicinity of the left and right side edges of the top end at the top end of the slope, and the earth pressure is balanced. An underground steel wall body 2 as a sheet pile wall having a depth embedded in the secured ground is continuously arranged in the length direction (continuous direction) of the embankment 1, and these two rows of underground steel A reinforcement structure for embankment has been proposed that forms a structural skeleton 6 composed of a wall-making body 2 and a ground closed by two rows of underground steel wall bodies 2 (see, for example, Patent Document 1). The heads of the left and right underground steel wall bodies 2 are connected by tie rods 10.
According to this construction method, the settlement of the embankment 1 is suppressed during an earthquake, and the underground steel wall body, which is excellent in water shielding, secures the height of the embankment 1 as a levee body. It can prevent bank breakage due to water overflow and is effective as reinforcement of embankment 1.

JP 2003-13451 A

By the way, as shown in FIG. 7, when the slope 1a on the inner side of the levee collapses due to flooding during flooding, the ground surface 1e of the foundation ground 5 below the embankment 1 is scoured, and the underground steel wall There is a concern that the proof strength of the body 2 is lost, and eventually the function as a dike is impaired.
Moreover, when external force acts on the above-mentioned two rows of underground steel wall bodies 2 at the time of an earthquake or flood, in order to suppress the excessive deformation | transformation of the upper part of underground steel wall bodies 2, as mentioned above It is necessary to connect two rows of underground steel wall bodies 2 with tie rods 10. However, because the tie rods 10 are arranged near the top of the embankment 1, two rows of underground steel walls at the top 1c of the embankment 1 due to liquefaction during an earthquake or flooding during a flood. When the top end portion between the bodies 2 sinks a little or is scraped off slightly, the tie rod 10 near the top end 1c is exposed.

  Since the tie rods 10 are arranged at substantially equal intervals in the length direction of the embankment 1, when the top end 1c of the embankment 1 is used as a road, the exposed tie rod 10 becomes an obstacle, and the top of the embankment 1 It becomes difficult for the vehicle to travel on the end 1c. Note that not only the road embankment 1 but also the embankment embankment 1 of the river 7, the top end 1 c portion may be used as a road and is not regularly used as a vehicle road. May also be used as a path for emergency vehicles, and if the vehicle cannot pass through the top 1c portion of the embankment 1 after an earthquake or flood, confusion will occur.

  The present invention is a structure in which embankment is reinforced with underground steel wall body, and the slope of the embankment collapses due to flooding at the time of flood, and the ground surface is scoured, and the strength of underground steel wall body It aims at providing the reinforcement structure of the embankment which can suppress the fall of tsunami.

In order to solve the above-mentioned problem, the embankment reinforcing structure according to claim 1 is provided with at least one row of underground steel wall bodies along a continuous direction of the embankment within a range of a substantially top end of the continuous embankment. And
In addition, at least one slope of the embankment is provided with an oblique material obliquely so as to become lower as it goes away from the top end of the embankment so as to protect the slope, and a lower portion of the oblique material is disposed on the embankment It is characterized by being placed on the lower ground.

In the invention according to claim 1, the slope of the embankment is protected by the diagonal material, and the slope of the embankment can be prevented from collapsing during an earthquake or flood.
In particular, in the case of flooding due to flooding, the water flow over the embankment will push the soil on the slope inside the embankment of the embankment, causing the slope to collapse, and the water flow further scours the ground surface below the embankment. And it can suppress that the proof stress of an underground steel wall body falls by this. The diagonal is not a slope covering the slope of the embankment, but is placed on the ground below the embankment and will not be washed away by flooding during floods.

  The embankment reinforcing structure according to claim 2 is a steel sheet pile wall made of steel sheet piles obliquely driven on the ground by connecting the diagonal members in the invention according to claim 1. .

In the invention according to claim 2, the slope of the embankment is protected by the diagonal material, and the slope of the embankment can be prevented from collapsing during an earthquake or flood.
In particular, in the case of flooding due to flooding, the water flow over the embankment will push the soil on the slope inside the embankment of the embankment, causing the slope to collapse, and the water flow further scours the ground surface below the embankment. And it can suppress that the proof stress of an underground steel wall body falls by this. The diagonal is not a slope covering the slope of the embankment, but is placed on the ground below the embankment and will not be washed away by flooding during floods.

  The embankment reinforcing structure according to claim 3 is the invention according to claim 1, wherein the diagonal members are placed in a plurality of directions obliquely on the ground at intervals along the continuous direction of the embankment, A planar reinforcing material disposed obliquely on the slope is fixed along the diagonal material.

  In the invention according to claim 3, the slope inside the bank is collapsed by the slope and the plane reinforcing material installed at an interval such as the diagonal pile, and the ground surface below the ground is collapsed at the time of flooding due to flooding. Can be suppressed from being scoured. The planar reinforcing material may be provided not only between the diagonal members but also in the diagonal member portion, and may have a continuous structure over a distance longer than the interval between the diagonal members.

The embankment reinforcement structure according to claim 4, in the invention according to claim 1, a plurality of the diagonal members are obliquely placed on the ground at intervals along the length direction of the embankment,
The diagonal is arranged substantially parallel to the slope of the embankment;
In addition, the oblique member is fixed with a slope member covering the slope.

  In the invention according to claim 4, it is possible to prevent the slope on the inside of the bank from collapsing and the ground surface below it being scoured by the slanting material and the slope material when the flood overflows. . In other words, the slope is fixed to the slope covering the slope at the time of flooding, so that the slope can be protected by the slope during the flood.

  The embankment reinforcing structure according to claim 5 is the invention according to any one of claims 1 to 4, wherein the upper end portion of the diagonal member is substantially in contact with the upper end portion of the underground steel wall body. It is characterized by being in a connected state or a connected state.

  The embankment reinforcing structure according to claim 6 is characterized in that, in the invention according to claim 5, two or more rows of the underground steel wall bodies reinforced with diagonal members are not connected to each other. .

  In the inventions according to claims 5 and 6, in addition to the protection of the slope by the diagonal material, the deformation of the underground steel wall body is suppressed by the diagonal material. As a result, when the underground steel wall bodies are arranged in two or more rows, it is not necessary to reinforce them by connecting them with tie rods. It is possible to prevent the tie rod from being exposed at the end and hindering the passage of the vehicle.

  According to the present invention, since the slope of the embankment can be protected by the diagonal material, when flooding due to flooding, the sand that forms the slope inside the levee is washed away by the water flow of the overflow water, and the slope collapses. It is possible to suppress scouring the foundation ground below the embankment and reducing the proof stress of the underground steel wall.

It is a schematic sectional drawing which shows the reinforcement structure of the embankment which concerns on 1st Embodiment of this invention. It is a schematic perspective view which shows the reinforcement structure of the embankment which concerns on 1st Embodiment. It is a schematic perspective view which shows the reinforcement structure of the embankment which concerns on the modification of 1st Embodiment. It is a schematic perspective view which shows the reinforcement structure of the embankment which concerns on 2nd Embodiment of this invention. It is a schematic perspective view which shows the reinforcement structure of the embankment which concerns on 3rd Embodiment of this invention. It is a schematic sectional drawing which shows the reinforcement structure of the embankment for demonstrating the suitable angle of the diagonal in the reinforcement structure of a embankment. It is a schematic sectional drawing which shows the embankment which has the conventional reinforcement structure at the time of the flooding by flood.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the embankment reinforcement structure of the first embodiment is used, for example, as a river bank. Slopes 1 a are formed on the left and right sides of the embankment 1.
In the reinforcement structure of this embankment 1, the underground steel wall body 2 which consists of the steel sheet pile wall which connected the steel sheet pile 3 (a steel pipe sheet pile is included) in the range of the substantially top end 1c of the embankment 1 is installed. Note that the range of the approximate top end 1c also includes the shoulder 1b portion that is the upper end of the slope 1a slightly outside the top end 1c.

  The steel sheet pile 3 constituting the underground steel wall body 2 penetrates the embankment 1 and has a depth to be embedded in the ground where the balance of earth pressure is secured, and in the continuous direction (length direction) of the embankment 1. It is continuously installed along. The head portion (upper end portion) of the underground steel wall body 2 is located at a height near the height of the top end 1 c of the embankment 1. In the reinforcement structure of the embankment 1, a structural skeleton portion 6 is formed in the embankment 1. The structural skeleton 6 is made of ground that is closed by underground steel wall bodies 2 and 2 provided in two rows.

  On the slope 1a inside the bank of the embankment 1, steel sheet piles 8 as diagonal members are cast diagonally along the slope 1a so as to become lower as the distance from the top end 1c of the embankment 1 increases. The steel sheet pile 8 is deeply embedded in the ground 5 below the embankment 1 deeper than the length of the slope 1 a of the embankment 1. Further, the steel sheet pile 8 is connected to form an oblique steel sheet pile wall 9, and the slope 1 a is substantially covered by the steel sheet pile wall 9. The steel sheet pile wall 9 may be disposed slightly below the slope 1a and hidden in the earth or sand, or the steel sheet pile wall 9 may be covered and covered with a covering material or various slope materials. May be. Moreover, when covering the diagonal steel sheet pile wall 9 with earth and sand, it is preferable to provide the structure which stops earth and sand on the slope of the slope 1a side of the steel sheet pile wall 9 so that earth and sand may not slide down. In FIG. 1, the steel sheet pile wall 9 and the slope 1a are substantially parallel.

  Moreover, the head of the underground steel wall body 2 and the upper end of the steel sheet pile wall 9 are in a substantially contacted state or a connected state (for example, a state integrated with coping concrete, a state fixed with bolts, By engaging with a fastener or the like, a horizontal force (in this case, a direction away from the river 7) on the steel sheet pile wall 9 side with respect to the underground steel wall 2 during an earthquake or flood It is possible to counteract the force in the axial direction of the slanted sheet pile wall 9 against the force of the two rows of underground steel wall bodies 2).

  The oblique steel sheet pile wall 9 connecting the steel sheet piles 8 as described above is arranged along the substantially sloped surface 1a, so that the embankment 1 is used as a dike and flooding from the river 7 occurs during flooding. However, since the steel sheet pile wall 9 is arranged along the slope 1a inside the bank, the collapse of the slope 1a can be suppressed. That is, since the slope 1a is protected by the inclined steel sheet pile wall 9, the slope 1a can be prevented from collapsing due to the water flow that has overflowed, and the foundation ground 5 below the slope 1a is scoured. It is possible to suppress a decrease in the yield strength of the underground steel wall body 2 caused by.

  Moreover, since the diagonal steel sheet pile 8 (steel sheet pile wall 9) suppresses a deformation | transformation of the upper part of the underground steel wall body 2, two rows of underground steel wall bodies 2 are shown by the tie rod 10 (illustrated in FIG. 7). The tie rod 10 is not exposed even if the ground at the top end 1c of the embankment 1 sinks or is scoured during an earthquake or flood, allowing vehicles and the like to pass through. be able to. In this case, as shown in FIG. 3, in each of the left and right slopes 1 a, the inclined steel sheet pile wall made of steel sheet piles 8 is respectively provided on the underground steel wall body 2 adjacent to each slope 1 a. 9 is preferably provided.

  The steel sheet pile 3 used for the underground steel wall body 2 and the steel sheet pile 8 used for the oblique steel sheet pile wall 9 include a U-shaped steel sheet pile, a hat-shaped steel sheet pile, a steel pipe sheet pile, a Z-shaped steel sheet pile, and a combined wall body. Etc. can be used.

Next, a second embodiment of the present invention will be described.
As shown in FIG. 4, in the embankment reinforcement structure of the second embodiment, in the embankment 1 reinforced by two rows of underground steel wall bodies 2 as in the first embodiment, the slope 1 a on the inner side of the bank is shown. Further, a plurality of slant piles 12 (for example, steel pipe piles) are arranged at intervals in the length direction of the embankment 1. The inclined piles 12 are arranged at substantially equal intervals in the length direction of the embankment 1 and the inclined piles 12 are arranged at an angle along the slope 1a so as to become lower as the distance from the top end 1c of the embankment 1 increases. ing. That is, the slope 1a and the diagonal pile 12 are substantially parallel. Further, the slant pile 12 is embedded in the same manner as the slanted steel sheet pile 8 of the first embodiment, and is joined to the underground steel wall body 2 by locking, coupling, fixing or the like.

  On the slope 1 a inside the embankment of the embankment 1, the planar reinforcing material 13 is spread over almost the entire surface and is pressed and fixed by the slant pile 12. The planar reinforcing material 13 may be covered with earth and sand. In addition, the planar reinforcing material 13 is fixed by being locked or connected to the slant pile 12 so as not to be washed away when water overflows.

  The planar reinforcing material 13 is preferably flexible and has a required strength. For example, a product obtained by processing a synthetic resin material into a sheet shape, generally called geosynthetics or geotextile, can be used. The planar reinforcing material 13 includes a grid shape or a net shape. In the case of the grid shape or the net shape, it is preferable that the grid or the net size is small enough to prevent earth and sand from flowing out due to overflow.

In the embankment reinforcement structure of the second embodiment, as in the first embodiment, the slope 1a is prevented from collapsing due to flooding during a flood, and the foundation ground below the slope 1a of the fill 1 is suppressed. The fall of the yield strength of the underground steel wall body 2 by 5 being scoured can be suppressed.
Moreover, since the slant pile 12 suppresses deformation of the underground steel wall 2, the tie rod 10 is not required as in the case of the first embodiment, and the tie rod at the top end 1 c portion of the embankment 1 during an earthquake or flood. Thus, traffic such as a vehicle can be made possible.
In addition, various steel materials, such as a steel pipe pile, a steel pipe sheet pile, a steel sheet pile, an H-section steel, or a combination wall body, can be used as a diagonal material arrange | positioned at intervals, such as the diagonal pile 12. FIG. In order to omit the tie rod 10, diagonal piles (diagonal materials) 12 are arranged on both the left and right slopes 1 a, and both of the two rows of underground steel wall bodies 2 are reinforced by the diagonal piles 12. A structure is preferred.

Next, a third embodiment of the present invention will be described.
As shown in FIG. 5, the embankment reinforcement structure of the third embodiment is replaced with the surface reinforcing material 13 in the embankment reinforcement structure of the second embodiment, and various slope materials such as a vegetation mat, a cage frame, and a cage mat. 15 is used to protect the sloped surface material 15 by the inclined piles 12 arranged at intervals so as to prevent the slope material 15 from flowing out due to overflow.

Therefore, the slope member 15 is locked, connected, or fixed to the slant pile 12 so that the slope member 15 does not flow out of the slope even if there is water overflow.
Also in the third embodiment, the same excellent effects as those of the second embodiment can be achieved. Also in the case of the third embodiment, in order to omit the tie rod 10, the oblique piles 12 are arranged on both the left and right slopes 1 a, and both the two rows of underground steel wall bodies 2 are reinforced by the oblique piles 12. It is preferable that the structure is the same.

In the first to third embodiments, the underground steel wall bodies 2 for reinforcing the embankment 1 may be arranged in one row. In this case, it is preferable that the underground steel wall body 2 is in the vicinity of the slope 1a inside the bank to be protected.
Further, in the first to third embodiments, the tie rod 10 that connects the two rows of underground steel wall bodies 2 is used as the head of the underground steel wall body 2 and the diagonal material (oblique It can also be set as the structure which cut | disconnected the upper end part of the steel sheet pile wall 9 (steel sheet pile 8) and the slant pile 12). In this case, the diagonal steel sheet pile wall 9 and the diagonal pile 12 do not suppress the deformation of the underground steel wall body 2 but mainly protect the slope 1a. However, the underground steel wall body 2 and the diagonal material are close to each other to such an extent that water overflow does not enter between the underground steel wall body 2 and the diagonal material.

  Moreover, in 1st Embodiment and 2nd Embodiment, the steel sheet pile wall 9 which consists of the diagonal steel sheet pile 8 which protects the slope 1a, the oblique pile 12, and the slope 1a which should each protect the planar reinforcement 13 are abbreviated. Although parallel, it does not necessarily have to be substantially parallel to protect the slope 1a. Basically, it is not necessary to scour the vicinity of the underground steel wall body 2 at the time of flooding due to flooding. As long as it is in a state of covering the vicinity of.

  For example, as shown in FIG. 6, the foundation ground 5 is scoured and the proof stress of the underground steel wall body 2 is reduced in the ground inside the bank of the two rows of underground steel wall bodies 2. Although it is a portion that is in the vicinity of the steel wall body 2 and immediately below the slope 1a, even if the ground away from this is scoured, it directly affects the strength of the underground steel wall body 2. Absent. That is, when the predetermined range toward the slope of the embankment 1 is scoured along the horizontal line (ground surface) passing from the underground steel wall body 2 to the lower end of the embankment 1, the underground steel wall body 2 It is the range that affects the yield strength.

  From the angle θ formed by the horizontal line and the line segment connecting the point b that is the outermost side of the predetermined range and the point a that is the boundary between the slope 1a and the top edge 1c (the upper end of the shoulder 1b), As long as the angle between the horizontal sheet and the steel sheet pile 8 (slanted pile 12, planar reinforcing material 13) of the steel sheet pile wall 9 as the diagonal material is small. That is, the diagonal material may be equal to or smaller than the angle θ even if it is not substantially parallel to the slope 1a.

Here, since the angle formed by the slope 1a and the horizontal line is smaller than the angle θ, the angle formed by the steel sheet pile 8 (steel sheet pile wall 9), the oblique pile 12, and the planar reinforcing material 13 is determined from the angle θ. It is good if it is up to the angle of the slope 1a.
In addition, when the above-mentioned scouring is performed, the predetermined range in which the underground steel wall body 2 is affected by the proof stress needs to be obtained by, for example, a simulation experiment including a desk.
In the third embodiment, since the slope member 15 is disposed on the slope 1a, the slant pile 12 and the slope member 15 need to be substantially parallel to the slope 1a.

1 Embankment 1a Slope 1c Top edge 2 Underground steel wall 8 Steel sheet pile (diagonal)
9 Steel sheet pile wall (diagonal)
12 Diagonal pile
13 Planar reinforcement 15 Slope

Claims (6)

Within one or more rows of underground steel wall bodies along the continuous direction of the embankment is provided within the range of the approximate top edge of the continuous embankment,
In addition, at least one slope of the embankment is provided with an oblique material obliquely so as to become lower as it goes away from the top end of the embankment so as to protect the slope, and a lower portion of the oblique material is disposed on the embankment Reinforcement structure of embankment characterized by being placed on the lower ground.   2. The embankment reinforcing structure according to claim 1, wherein the embankment is a steel sheet pile wall made of steel sheet piles that are obliquely driven and connected to the ground. A plurality of the diagonal members are obliquely placed on the ground at intervals along the continuous direction of the embankment,
The reinforcing structure for embankment according to claim 1, wherein the diagonal member is fixed with a planar reinforcing member that is disposed obliquely on the slope along the diagonal member. A plurality of the diagonal members are placed obliquely on the ground at intervals along the length direction of the embankment,
The diagonal member is disposed substantially parallel to the slope of the embankment,
2. The embankment reinforcing structure according to claim 1, wherein the diagonal member fixes a slope member covering the slope.   The upper end portion of the diagonal member is in a state of being substantially in contact with or connected to the upper end portion of the underground steel wall body, according to any one of claims 1 to 4. Filling reinforcement structure.   6. The embankment reinforcing structure according to claim 5, wherein two or more underground steel wall bodies reinforced with diagonal materials are not connected to each other.

Images