JP4121669B2 - Revetment wall piles and revetment structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bank for a revetment wall and a revetment structure for preventing breakage of a wall of a dike.
[0002]
[Prior art]
Conventionally, parapets (breast walls) have been laid along the shore and constructed as walls of the dike. A parapet is a concrete wall that provides the same level of strength as the required embankment cross-section (strength that can withstand water pressure and does not leak from the back) when the embankment site of the required width cannot be obtained due to the conditions of the hinterland. It is. Parapets are exposed to tsunamis and waves mixed with sand, gravel, etc., so the ground below the parapets is washed away by waves, or they flow out due to seepage water and the earth pressure at the back, resulting in sedimentation or damage. If the gravel collides with the parapet, the parapet may be damaged and worn. Therefore, by laying a wave-dissipating block on the front of the parapet or driving a sheet pile into the front of the parapet, the parapet was prevented from being directly exposed to tsunamis and waves, preventing the parapet from being damaged and worn. .
[0003]
[Problems to be solved by the invention]
However, when a tsunami or wave is generated by a natural disaster such as wind and rain and the water flow is fast, the sand on the bottom of the wave-dissipating block is washed out. And when the sand on the bottom surface of the wave-dissipating block is washed away, the wave-dissipating block may sink or flow out.
In addition, since sand, gravel, etc. are mixed with water flow, tsunami, and waves, the wave-dissipating block and sheet pile may be worn by sand and damaged by gravel collision. For these reasons, maintenance of wave-dissipating blocks and sheet piles was required.
[0004]
The present invention has been made in view of the above circumstances, and can reduce wear and breakage due to sand, gravel, etc., and can reduce maintenance, and the revetment wall pile can be used as a front surface of a wall of a levee. The purpose is to provide a revetment structure erected in the area.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a bank for a revetment wall (for example, a steel pipe pile 31 for a revetment wall) is provided in front of a wall surface of a dike (for example, a parapet 20) and protects the wall surface of the dike. ) And
A pile body (34);
A pair of engaging members (33) provided at positions facing each other across the central axis of the pile body;
With
A plurality of protrusions (for example, protrusions 32 and protrusions 37) for protecting the pile body are provided on one side surface portion (for example, A portion) of the pile body between the pair of engaging members. The other side surface portion (for example, B portion) of the pile main body is not provided with a protrusion .
[0006]
According to invention of Claim 1, the some protrusion provided in the surface of a pile main body becomes a reinforcing material of a pile main body, and protects a pile main body. For example, the life of a pile for a revetment wall is prolonged by increasing the strength of the pile body against at least gravel collision.
[0007]
In addition, the levee wall pile is erected on the front surface of the wall of the levee so that the wall of the levee is protected from damage or wear caused by, for example, tsunami or waves mixed with sand or gravel. Therefore, when standing the revetment wall pile on the front of the wall of the embankment, it is better to stand so that it is higher than the water surface, that is, when the revetment wall pile is erected, the pile protrudes from the water. It is better to set up a pile for the revetment wall.
[0008]
Moreover, since the pile for a revetment wall is exposed to at least tsunami and waves mixed with sand and gravel, a pile body made of concrete or metal is preferable.
In the case of concrete, the corrosion resistance to water is stronger than that of metal. The concrete pile main body is, for example, an RC (reinforced concrete) pile, a PC (prestressed concrete) pile, or the like.
Metals are more susceptible to corrosion than concrete but are tough. Therefore, in the case of metal, it is better to increase the corrosion resistance against water by performing anticorrosion treatment such as heavy anticorrosion coating on the surface of the pile body. The metal pile body is a steel pipe pile or the like.
A composite pile of concrete and steel pipe may be used.
[0009]
As will be described later, the pile for the revetment wall may be a sheet pile in order to stand continuously along the front surface of the wall of the embankment and use this as the revetment wall. A sheet pile is a steel sheet pile, a concrete sheet pile, RC sheet pile, PC sheet pile, H-shaped steel, a steel pipe sheet pile, etc.
[0010]
Moreover, the protrusion provided in the surface of a pile main body protects a pile main body from at least sand and gravel mixed with a tsunami and a wave, for example. Therefore, the protrusion is preferably made of concrete or metal like the pile body. The protrusion may be the same as or different from the pile body.
[0011]
In addition, the method of standing the revetment wall pile in front of the wall of the levee is established by, for example, driving the revetment wall pile into a natural ground in front of the wall of the levee or press-fitting. Therefore, when a protrusion is provided in the lower part of the pile main body (or press-fitting, the same applies hereinafter), the protrusion becomes a resistance when the pile main body is driven into the natural ground, and it becomes difficult to drive the revetment wall pile. Therefore, it is better not to provide a protrusion at the driving portion at the bottom of the pile body.
[0012]
In addition, a protrusion may be provided by fixing the protrusion to the surface of the pile body, or a pile for a revetment wall may be formed by a pile mold having a protrusion on the surface. If there is a part.
[0013]
And, for example, when at least gravel collides with a protrusion provided on the surface of the pile body and cracks the gravel, collision energy is consumed by breaking the gravel, and the impact on the pile body is alleviated. That is, the protrusion provided on the surface of the pile main body protects the revetment wall pile from the collision of gravel and the like, thereby extending the life of the revetment wall pile.
[0014]
In addition, since the gap between the protrusions buffers the flow of water and the flow of water slows, at least the collision energy of gravel mixed with water against the pile for the revetment wall is buffered, and at least mixed with water. Friction energy to the revetment wall pile by sand is absorbed. Therefore, the breakage and wear of the revetment wall pile are reduced, and the life of the revetment wall pile is prolonged.
[0015]
Moreover, when at least sand and gravel collide with the protrusion provided on the surface of the pile body, the collision angle of sand and gravel is dispersed, and the occurrence of local collision can be suppressed. Therefore, the local breakage and wear of the revetment wall pile can be reduced, and the life of the revetment wall pile becomes longer.
[0016]
In this way, the protrusions provided on the surface of the pile body protect the piles for revetment walls from sand and gravel collisions equally, and the water flow is evenly buffered by the gap between the protrusions and the protrusions. Therefore, it is better to distribute the protrusions evenly distributed on the surface of the pile for the revetment wall.
[0017]
The invention according to claim 2 is a revetment structure in which the pile for a revetment wall according to claim 1 is continuously erected along the front surface of the wall surface of the dike,
The other side surface portion of the pile main body is erected toward the front surface of the wall surface of the levee, and the engaging member of the pile for the revetment wall is engaged to form a revetment wall (30). It is said.
[0018]
According to the invention described in claim 2, by building up the revetment wall piles continuously along the front surface of the wall of the embankment and erecting the revetment wall, at least tsunami or waves mixed with sand and gravel The wall of the embankment is not directly exposed, and the wall of the embankment can be protected. Furthermore, since the revetment wall has a protrusion on the surface, the embankment can be protected by a revetment wall having a longer life.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing a revetment structure 1 to which the present invention is applied, in which 10 is a road, 20 is a parapet (chest wall), and 30 is a revetment wall.
In addition, the revetment structure 1 is installed on the shore of the sea, a river, or a lake. In any case, the revetment structure 1 is installed to protect the hinterland from tsunamis, waves, and the like.
[0022]
The parapet 20 is a bank wall and is laid along the shore. In addition, a road 10 is provided along the shore at the bank portion of the dike (upper part of the dike).
A revetment wall 30 for protecting the parapet 20 from at least a tsunami or a wave mixed with sand or gravel is provided in front of the parapet 20. The lower part of the revetment wall 30 is driven into the natural ground GL, and is constructed so that the revetment wall 30 does not collapse due to waves and tsunamis. The revetment wall 30 is in close contact with the front surface of the parapet 20. Moreover, the height of the revetment wall 30 is higher than the water surface WL, that is, the water is shielded so that water does not leak into the rear portion 21 of the revetment wall 30. As a result, the parapet 20 is not directly exposed to tsunamis and waves.
[0023]
A large number of protrusions 32 that are protrusions are provided on the front surface of the revetment wall 30. These protrusions 32 are evenly arranged on the surface of the revetment wall 30. These protrusions 32 serve as a reinforcing material for the revetment wall 30 and protect the revetment wall 30.
For example, when sand or gravel mixed with tsunami or waves collides with the revetment wall 30, it is reinforced by the protrusions 32, so that damage and wear are less likely to occur.
[0024]
FIG. 2 is a plan view showing the revetment structure 1 from above. As shown in FIG. 2, the revetment wall 30 is composed of a plurality of steel pipe piles 31 for a revetment wall. As shown in FIG. 3, a steel pipe pile 31 for a revetment wall, which is a pile for a revetment wall, includes a large number of protrusions 32, engagement members 33 and 33, and a pile body (steel pipe) 34.
As will be described later, the engaging members 33 and 33 are engaging portions with adjacent steel wall piles for a revetment wall when the steel wall pile 31 for a revetment wall is erected on the front surface of the parapet 20. The flowing water to the back part 21 of the revetment wall 30 comprised with the steel pipe pile 31 for walls is prevented. The engaging members 33 and 33 are provided on the side surface 35 which is the surface of the pile body along the axial direction of the pile body 34. Further, the line connecting the engaging member 33 and the other engaging member 33 is provided so as to substantially pass through the central axis of the pile body 34, and the side surface 35 has an A portion (facing the sea, river, etc.) and a B portion. It is designed to bisect (facing the parapet 20). A large number of protrusions 32 are provided evenly distributed on the upper part of one of the two A portions (herein referred to as the protrusions 36). Further, the arrangement of a large number of protrusions 32 is provided to buffer the flow of water. No protrusion is provided in the lower part of the A part and the other B part which is divided in half. The length of the protruding portion 36 is longer than the depth of water at the place where it is intended to stand.
The protrusion 32 has a cylindrical shape, and the protrusion tip is substantially hemispherical.
[0025]
The revetment wall 30 is formed with the steel pipe pile 31 for revetment walls as mentioned above.
As a first step, the revetment wall 30 is constructed by pressing the revetment wall steel pipe pile 31a into the natural ground GL in front of the parapet 20 and standing up. As a second step, the new revetment wall steel pipe pile 31b is grounded so that the engagement member 33 of the new revetment wall steel pipe pile 31b engages with the engagement member 33 of the revetment wall steel pipe pile 31a. Press fit into the mountain GL. In this way, the revetment wall steel pipe piles 31 a, 31 b... Are continuously press-fitted along the front surface of the parapet 20 to form the revetment wall 30. In addition, the steel pipe pile 31 for revetment walls is press-fit in the natural ground GL so that a pile may protrude from the water surface WL.
In addition, when press-fitting the steel pipe pile 31 for a revetment wall, it can carry out using the well-known pile press-in extraction machine (not shown) which takes a reaction force from an existing pile and press-fits a pile.
[0026]
According to the above embodiment, the revetment wall 30 is formed by continuously driving the steel pipe pile 31 for revetment wall provided with the protrusion 32 on the surface of the pile main body 34 to the front surface of the parapet 20 and standing.
Therefore, the some protrusion 32 provided in the surface of the steel pipe pile 31 for revetment walls becomes a reinforcing material of the pile main body 34, and protects the steel pipe pile 31 for revetment walls. For example, the strength of the pile body 34 at least against the collision of gravel increases the life of the steel pipe pile 31 for revetment walls.
[0027]
Moreover, for example, when at least gravel collides with the protrusion 32 provided on the surface of the steel pipe pile 31 for revetment wall and the gravel breaks, the collision energy is consumed by breaking the gravel, and impact on the steel pipe pile 31 for revetment wall. Is alleviated. That is, the protrusion 32 provided on the surface of the pile body 34 protects the revetment wall steel pipe pile 31 from collision of gravel and the like, thereby extending the life of the revetment wall steel pipe pile 31.
[0028]
Further, since the gap between the protrusion 32 and the protrusion 32 buffers the flow of water, the flow of water slows, so that at least the collision energy of the gravel mixed with the water against the steel pipe pile 31 for the revetment wall is buffered, and at least the water Friction energy to the steel pipe pile 31 for a revetment wall by sand mixed in is absorbed. Therefore, the breakage and wear of the revetment steel pipe pile 31 are reduced, and the life of the revetment wall steel pipe pile 31 is extended.
[0029]
Moreover, when at least sand or gravel collides with the protrusion 32, the collision angle of sand or gravel is dispersed, and the occurrence of local collision can be suppressed. Therefore, local breakage and wear of the steel pipe pile 31 for revetment wall can be reduced, and the life of the steel pipe pile 31 for revetment wall becomes longer.
[0030]
In addition, although the protrusion of the surface of the above revetment wall pile was made into the protrusion 32, as shown in FIG. 4, the protrusion 37 provided along the axial direction of the pile main body 34 may be sufficient, for example. In addition, in the case of a protrusion, the bending strength of a pile main body improves rather than the case of a protrusion. A steel pipe pile 31 for a revetment wall shown in FIG. 4 includes a plurality of protrusions 37, engaging members 33 and 33, and a pile body 34.
The engaging members 33 and 33 are provided on the side surface 35 which is the surface of the pile body along the axial direction of the pile body 34. Further, a line connecting the engaging member 33 and the other engaging member 33 is provided so as to substantially pass through the axis of the pile main body 34, and the side surface 35 is divided into two parts, an A part and a B part. Plural (for example, eight) prismatic ridges 37 are provided in parallel and distributed in the upper part of one of the A portions (herein, referred to as the protrusions 36). Further, the arrangement of the plurality of protrusions 37 is provided to buffer the flow of water. No protrusions are provided at the lower part of the A part and at the other B part divided in half. The length of the protruding ridge portion 36 is longer than the depth of water at the place where it is intended to stand.
Moreover, although the protrusion 34 was provided along the axial direction of the pile main body 34, a protrusion may be provided along the circumferential direction of the pile main body 34, or both protrusions and protrusions may be provided on the surface. Well, what is necessary is just to provide a protrusion on the surface of a pile main body.
[0031]
In the above-described embodiment, the revetment wall pile is the steel revetment wall steel pipe pile 31, but may be a concrete revetment wall pile or a composite pile of concrete and steel. Similarly, the protrusion 32 and the protrusion 37 may be made of concrete or metal such as steel, and may be the same as or different from the pile main body 34. The cross-sectional shape of the pile body 34 can also be changed as appropriate. For example, a steel sheet pile, H steel pile, RC pile, PC pile, etc. may be used.
The shapes of the protrusions 32 and the protrusions 37 can be changed as appropriate, and may be, for example, prismatic protrusions, conical protrusions, semi-cylindrical protrusions, or the like.
[0032]
In addition, when the wave-dissipating block is laid on the front surface of the parapet 20, for example, the revetment wall 30 (or the steel pipe pile 31 for the revetment wall) is erected on the front surface of the wave-dissipating block, For example, the revetment may be provided immediately before the parapet 20 by press-fitting the revetment wall steel pipe pile 31 while excavating the wave-dissipating block and the natural ground through the auger through the inside of the steel pipe pile 31 for the revetment wall. The wall steel pipe pile 31 may be erected to protect the parapet 20.
In addition, it is needless to say that specific details such as a dike, a parapet, a revetment wall creation process, and a revetment wall steel pipe pile standing process can be appropriately changed.
[0033]
【The invention's effect】
According to invention of Claim 1, the some protrusion provided in the surface of the pile for revetment walls becomes a reinforcing material of a pile main body, and protects the pile for revetment walls. For example, the strength of the revetment wall pile at least against the impact of gravel increases the life of the revetment wall pile. Therefore, the maintenance cost of the revetment wall pile can be reduced, and the reliability of the revetment wall pile is improved.
[0034]
According to the second aspect of the present invention, by installing a revetment wall in which piles for revetment walls are continuously erected on the front side of the wall surface of the embankment, at least tsunami or waves mixed with sand and gravel are levees. Will not be exposed directly, and the walls of the embankment can be protected. Furthermore, since with a projection on the revetment wall surface becomes more life high revetment walls, it is possible to protect the embankment. Therefore, the maintenance cost of the revetment structure can be reduced, and the reliability of the revetment structure is improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a revetment structure as an example to which the present invention is applied.
FIG. 2 is a plan view showing the revetment structure of FIG. 1 from above.
FIG. 3 is a steel pipe pile for a revetment wall as a first example to which the present invention is applied.
FIG. 4 is a steel pipe pile for a revetment wall as a second example to which the present invention is applied.
[Explanation of symbols]
1 Seawall Structure 20 Parapet (wall of the dike)
30 Revetment wall 31 Steel pipe pile for revetment wall (pile for revetment wall)
32 Protrusions (projections)
34 Pile body 37 Projection (projection)

Claims (2)

A pile for a revetment wall that stands on the front of the wall of the embankment and protects the wall of the embankment,
The pile body,
A pair of engaging members provided at positions facing each other across the central axis of the pile body;
With
A plurality of protrusions for protecting the pile body are provided on one side surface portion of the pile body between the pair of engaging members, and a protrusion is provided on the other side surface portion of the pile body. A pile for a revetment wall , characterized by not being made . A revetment structure in which the revetment wall pile according to claim 1 is continuously erected along the front surface of the wall of the dike,
Revetment characterized in that the other side surface portion of the pile body is erected toward the front surface of the wall surface of the levee, and the engaging member of the pile for the revetment wall is engaged to form a revetment wall. Structure.

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