JP6830260B2 - Sheet pile wall buried structure - Google Patents

Description

The present invention relates to a sheet pile wall burying structure, and more specifically, to a sheet pile wall burying structure in which a foam is buried together with a sheet pile in an appropriate arrangement.

A sheet pile wall is constructed along the continuous direction of the embankment structure in order to reinforce the embankment structure such as the embankment for constructing roads and railways or river embankments. The sheet pile wall is a wall-like structure in which a plurality of sheet piles are fastened and continuous in one direction. The sheet pile wall placed in the center of the embankment structure or near the bottom of the embankment resists the pressure of the earth and sand on the back side of the sheet pile wall (particularly the earth and sand on the mountain side) and supports the embankment structure. Commonly used sheet piles include wood, reinforced concrete, and steel. Among them, steel sheet piles or steel pipe sheet piles manufactured using steel have high strength and are widely used.

By providing the sheet pile wall, the embankment structure can be reinforced as described above, but when an earthquake occurs or a liquefaction phenomenon occurs, the sheet pile wall loses its independence and inclines, and the embankment collapses. There is a risk of

On the other hand, for example, Patent Document 1 below discloses a double fastening bank formed by placing steel sheet pile walls in parallel in an embankment and tightening two rows of steel sheet pile walls with tie rods.

JP-A-04-254606

According to the steel sheet pile wall described in Patent Document 1 described above, the parallel walls are fastened to each other with tie rods, so that the autonomy is improved. However, when a large earthquake occurs and a liquefaction phenomenon occurs, there is a risk that the ground between the opposing steel sheet pile walls and the ground outside it will sink or collapse.

The present invention has been made in view of the above-mentioned problems. That is, the present invention provides a sheet pile wall-embedded structure that is excellent in autonomy and can suppress the occurrence of a liquefaction phenomenon in the earth and sand on the back surface of the sheet pile.

Sheet pile wall buried structure of the present invention, a sheet pile wall, and the a back side of the sediment to be embedded foams sheet pile wall, the buried sediment of the back side of the sheet pile wall foam, wherein The foam sheet comprises a first foam sheet embedded along the front surface of the sheet pile wall and a second foam sheet embedded along the back surface facing the front surface via the sheet pile wall. They are opposed to each other, and at least, characterized that you have been placed above the first vertical half in the region covered with the ground of the front.

In the sheet pile wall burying structure of the present invention, since the foam is embedded in the back surface side of the sheet pile wall, a part of the horizontal earth pressure when the bearing capacity of the ground is lowered due to the back earth pressure from the mountain side or the occurrence of an earthquake. Can be absorbed by the foam. Therefore, the sheet pile wall in the sheet pile wall buried structure of the present invention is not easily affected by the back surface earth pressure and the horizontal earth pressure, and is excellent in independence.
Further, in the sheet pile wall embedded structure of the present invention, since the foam is embedded on the back side of the sheet pile wall, the foam embedded on the back side of the sheet pile wall when a large earthquake occurs and a liquefaction phenomenon occurs. Is substantially a non-liquefied region. Therefore, the decrease in the bearing capacity of the sheet pile wall when the liquefaction phenomenon occurs is suppressed, and the collapse of the embankment is suppressed.

(1a) is a side schematic view showing an example of the sheet pile wall buried structure according to the first embodiment of the present invention, and (1b) is the upper surface schematic view of the sheet pile wall buried structure according to the first embodiment. .. It is a perspective view which shows an example of the drainage material. It is a side schematic diagram which shows an example of the sheet pile wall buried structure which concerns on 2nd Embodiment of this invention. (4a) is a partially enlarged view showing one aspect of the foam in the second embodiment of the present invention, and (4b) is a partially enlarged view showing a different aspect of the foam in the second embodiment of the present invention. is there. It is a side schematic which shows an example of the sheet pile wall buried structure which concerns on 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all drawings, similar components are designated by the same reference numerals, and duplicate description will be omitted as appropriate.
The various components of the present invention do not have to be individually independent, and a plurality of components are formed as one member, and one component is formed of a plurality of members. It is allowed that one component is a part of another component, that a part of one component overlaps with a part of another component, and so on. In the illustrated embodiment of the present invention, for the sake of easy understanding, there are cases where a specific member is shown relatively large or small as a whole, but in each case, the dimensional ratio of each configuration of the present invention is shown. It is not limited.

With respect to the description of the present invention or the present specification, when it is referred to as up and down without particular notice, the heavenly direction is referred to as upward from an arbitrary point, and the downward direction relative to the above heavenly direction is referred to as downward.

[First Embodiment]
The first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1a is a schematic side view showing an example of the sheet pile wall buried structure 100 according to the first embodiment of the present invention, and FIG. 1b is a schematic top view of the sheet pile wall buried structure 100. FIG. 2 is a perspective view showing an example of the drainage material 30 provided in the sheet pile wall buried structure 100.

The sheet pile wall buried structure 100 shown in FIG. 1a includes a sheet pile wall 20 and a foam 10 embedded in earth and sand 200 on the back surface 22 side of the sheet pile wall 20.
In the sheet pile wall buried structure 100 having such a configuration, a part of the horizontal earth pressure from the mountain side is absorbed by the foam 10 when the bearing capacity of the ground decreases due to the back earth pressure from the mountain side in normal times or the occurrence of an earthquake. Will be done. Therefore, the sheet pile wall 20 is not easily affected by the back surface earth pressure and the horizontal earth pressure, and the self-supporting state is maintained well. Further, the foam 10 is lighter than the ground and is a standard object. Therefore, the inertial force of the ground that receives the horizontal earth pressure from the mountain side is reduced in the foam 10, and as a result, the load on the sheet pile wall 20 due to the inertial force can be reduced.
Further, even when the earth and sand 200 on the back surface 22 side of the sheet pile wall 20 is liquefied due to a large earthquake, the region occupied by the foam 10 buried along the sheet pile wall 20 is substantially a non-liquefied region. Become. Therefore, the collapse of the embankment is suppressed, and at least the embankment surface 210 above the foam 10 is unlikely to collapse.

In the present invention, the mountain side means the side where the earth and sand that can give back earth pressure to the sheet pile wall exists, and the back surface of the sheet pile wall means the surface of the sheet pile wall facing the mountain side. To do. For example, on the sheet pile wall, the side where the mountain including the earth wall excavated by embankment or root cutting work exists is the mountain side. In the present embodiment, the side where the earth and sand 200 exists is the mountain side with reference to the sheet pile wall 20, and the one side surface of the sheet pile wall 20 facing the mountain side is the back surface 22. However, the present invention is not limited to this, and although not shown, if there is earth and sand on both sides of the sheet pile wall that can apply back earth pressure to the sheet pile wall, both sides of the sheet pile wall are set as the back side. It includes an embodiment in which the foam is arranged on both sides of the sheet pile wall. When there is earth and sand on both sides of the sheet pile wall that can give back earth pressure to the sheet pile wall, for example, when the sheet pile wall is buried in the central area of the embankment, or when the sheet pile wall is on the ground below the embankment. For example, when it is buried.

As shown in FIG. 1b, in the present embodiment, the sheet pile wall 20 is configured by fastening a plurality of sheet piles 21 in the continuous direction of the embankment composed of the earth and sand 200. The sheet pile wall 20 is buried in the ground from the middle to the lower end with respect to the ground surface (GL), and the side surface from the middle to the upper end opposite to the back surface 22 is exposed from the ground. .. Although not shown, the ground surface G.I. L. The sheet pile wall 20 may be hidden by a slope with earth and sand covering the opposite side surface.

The foam 10 is embedded along the back surface 22 of the sheet pile wall 20. When there is a gap between the sheet pile wall 20 and the foam 10, earth and sand may be embedded in the gap. The foam 10 in the present embodiment is a rectangular parallelepiped, and the lower end thereof is substantially the ground surface G.I. L. The upper end is a little lower than the upper end of the sheet pile wall 20, and is located below the embankment surface 210. However, this is only an example, and the shape and dimensions of the foam 10 are not particularly limited. Further, the foam 10 may be an integrally molded product, or may be configured by stacking a plurality of members.

The foam 10 is a composition containing a large number of bubbles inside. The presence of air bubbles gives elasticity to the foam 10, which allows the foam 10 to absorb backside earth pressure and horizontal earth pressure. Specific examples of the foam 10 include a foamed resin body and aerated concrete.

From the viewpoint of high vibration absorption and excellent lightness, a foamed resin is particularly preferably selected as the foam 10.

The foamed resin used as the foam 10 may be relatively lightweight and has the required compressive strength. For example, a polystyrene-based resin foam, a polyethylene-based resin foam, a polypropylene-based resin foam, or a polyurethane-based foam is used. Resin foams, polyvinyl chloride-based resin foams, thermoplastic polyester-based resin foams, polycarbonate-based resin foams, polyamide-based resin foams, polyphenylene ether-based resin foams, or a mixture of two or more of the above-mentioned resins, etc. is there. In particular, polystyrene-based resin foams, polyethylene-based resin foams, polypropylene-based resin foams, and combinations thereof are preferable in terms of light weight, strength, and the like, and are also excellent in absorbing earth pressure. Since the foam made of the foamed resin body is particularly excellent in light weight, it is easy to reduce the inertial force of the ground subjected to the horizontal earth pressure from the mountain side, and the load reducing effect of the sheet pile wall 20 is high.

From the viewpoint of being able to absorb backside earth pressure and horizontal earth pressure satisfactorily, the lower limit of the compressive strength of the foamed resin used for the foam 10 is preferably 10 kN / m ² or more, more preferably 30 kN / m. ^{It is 2} or more, more preferably 100 kN / m ² or more.
On the other hand, the upper limit of the compressive strength of the foamed resin body is not particularly limited, but is preferably 200 kN / m ² or less, and more preferably 150 kN / m ² or less.
The compression strength can be measured according to the measurement method shown in JIS K 7220: 2006. Specifically, a test piece having a vertical dimension of about 50 mm, a horizontal dimension of about 50 mm, and a thickness of about 50 mm is prepared, the test piece is compressed at a loading speed of 10 mm / min, and the compressive stress at 5% compressive strain is measured. Can be done.

Aerated concrete is concrete in which a large number of bubbles are formed inside to make it porous. Aerated concrete is produced by mixing air bubbles, a foaming agent, or the like when kneading the materials constituting general concrete.

The sheet pile wall 20 is configured by fastening a plurality of sheet piles 21. The sheet pile 21 is a member for holding down an embankment, backfilled earth and sand, and an earthen wall formed by root cutting work, and includes wood, reinforced concrete, and steel. From the viewpoint of strength, a steel sheet pile made of steel or a steel pipe sheet pile is preferable as the sheet pile 21. The sheet pile 21 is a substantially plate-like body, has fastening portions at both ends in the width direction, and is fastened to each other by fastening portions of adjacent sheet piles 21 to form a wall-shaped sheet pile wall 20. Further, although not shown, an annular object such as a steel pipe sheet pile may be used as the sheet pile 21, and a plurality of annular objects may be arranged in a predetermined direction, and adjacent steel pipe sheet piles may be fastened to each other by a fastening portion to form a sheet pile wall.

The foam 10 may be substantially solid except for air bubbles, but may have through holes inside as shown in FIG. 1a. That is, the foam 10 may be formed with a through hole penetrating the first side surface 12 facing the sheet pile wall 20 and the second side surface different from the first side surface 12. The second side surface is an arbitrary side surface of the foam 10 other than the first side surface 12, and in the rectangular parallelepiped foam 10, the second side surface is any one or more of the upper surface, the lateral side surface, the back surface, and the bottom surface. .. Specifically, the present embodiment includes a through hole 131 extending through the back surface 13 and the first side surface 12 of the foam 10, and a through hole 141 extending through the bottom surface 14 and the first side surface 12 of the foam 10. The through hole 131 and the through hole 141 are water passages having openings (openings 132, 133, 142, 143) on each of the above-mentioned side surfaces and having a hole diameter capable of flowing excess pore water. Although not shown, a non-woven fabric or an appropriately fine wire mesh may be attached to each of the openings of the through holes 131 and 141 in order to prevent earth and sand from flowing into the openings. In FIG. 1b, the through hole 141 is not shown.

When the liquefaction phenomenon occurs, the water content of the earth and sand 200 around the foam 10 rapidly increases, and the earth and sand 200 is liquefied. At this time, excess pore water flows in from the opening 132 of the through hole 131 provided on the back surface 13 and the opening 142 of the through hole 141 provided on the bottom surface 14, and is provided on the first side surface 12 not facing the earth and sand 200. It can be discharged from the opening 133 and the opening 143. The discharged water passes through a gap between adjacent sheet piles 21 and a hole arbitrarily provided in the sheet pile 21, and the ground surface G.I. L. It can be discharged to the side. As a result, the water content of the liquefied earth and sand 200 can be quickly lowered, and the collapse of the embankment surface 210 due to liquefaction can be suppressed.

Further, from the viewpoint of suppressing the collapse of the embankment surface 210 due to liquefaction, the drainage material 30 capable of allowing the water in the ground to flow in the vertical direction is directed from the back surface 13 of the foam 10 toward the mountain side. It is preferable to arrange a plurality of them along the ground surface (filling surface 210). As a result, when the liquefaction phenomenon occurs, it is possible to improve the drainage of the earth and sand 200 on the back surface 13 side of the foam 10 near the ground surface, and it is possible to suppress the collapse of the embankment surface 210 due to the liquefaction phenomenon.

The drainage material 30 in the present embodiment includes a flow path through which excess pore water can flow in the vertical direction. More specifically, as shown in FIG. 2, for example, as the drainage material 30, a plate-like body having a predetermined thickness and having a groove 33 continuous from the upper end surface 31 to the lower end surface 32 is provided on the surface thereof. Examples thereof include a mode in which an internal hole 34 continuous from the end surface 31 to the lower end surface 32 is provided inside, or a mode in which both the groove 33 and the internal hole 34 are provided. More specifically, the drainage material 30 in the present embodiment is a plate-like body made of foamed resin, and is provided with a plurality of grooves 33 on both sides (six in each of FIG. 2). , A plurality of internal holes 34 (three in FIG. 2) are provided inside. When liquefaction of the ground occurs, the drainage of the embankment surface 210 can be improved by flowing excess pore water through the groove 33 and the internal hole 34 from above to below or from below to above. The drainage material 30, which is a plate-like body in the present embodiment, is arranged so as to be substantially parallel to the surface direction of the sheet pile wall 20.

The member constituting the drainage material 30 is not particularly limited, but it is preferable to select a foamed resin in consideration of light weight and good workability.
Although not shown, the groove 33 and the opening of the drainage material 30 may be covered with a non-woven fabric, a fine mesh sheet, or the like so that earth and sand do not enter the opening of the groove 33 and the internal hole 34. preferable. For example, the entire drainage material 30 may be covered with a non-woven fabric or a fine mesh sheet.

The construction method of the present embodiment is not particularly limited, but for example, 20 sheet pile walls are placed on a predetermined land, then a foam 10 is placed on the back surface 22 side, and earth and sand 200 is backfilled so as to cover the foam 10. do it. If necessary, the drainage material 30 can be appropriately buried at a predetermined position during the backfilling.

[Second Embodiment]
Next, the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a side schematic view showing an example of the sheet pile wall buried structure 110 according to the second embodiment of the present invention. FIG. 4a is a partially enlarged view showing one aspect of the foam 10 according to the second embodiment of the present invention, and FIG. 4b is a partially enlarged view showing a different aspect of the foam 10 according to the second embodiment of the present invention. is there.
In the second embodiment, the surface of the sheet pile wall 20 opposite to the back surface 22 faces the river 220. As described above, the present invention can also be applied to a sheet pile wall facing a river, the sea, or the like. Although not shown, of course, in the sheet pile wall embedded structure 110 according to the second embodiment, the surface of the sheet pile wall 20 opposite to the back surface 22 may be exposed as in the first embodiment.

The sheet pile wall buried structure 110 includes a sheet pile wall 20 and a foam 10 embedded in earth and sand 200 on the back surface 22 side of the sheet pile wall 20.
The foam 10 in the present embodiment is configured by stacking flat plate-shaped foam resin plates 40 in the vertical direction. As described above, the foam 10 can be formed by combining foamed resin bodies having an arbitrary shape. The plurality of foamed resin plates 40 shown in FIG. 3 are parallelograms having a predetermined thickness, a substantially uniform vertical length (length in the back direction of the paper surface), and different horizontal lengths (length in the left-right direction of the paper surface). It is a flat foam resin block. Specifically, in the foam 10 of the present embodiment, the short to long lateral lengths are stacked in order from the short side in the side view, and the end faces of the foamed resin plates 40 are aligned on the sheet pile wall 20 side. It has the shape of an inverted triangle. Although not shown, the foam 10 may have a triangular shape formed by stacking the longest to the shortest horizontally long ones in order in the upward direction in a side view.

The sheet pile wall-embedded structure 110 including the inverted triangular foam 10 includes more foamed resin bodies in the vicinity of the embankment surface 210 (ground surface). When horizontal earth pressure is applied to the sheet pile wall 20 from the mountain side due to the occurrence of an earthquake, the horizontal earth pressure near the ground surface tends to increase relatively. On the other hand, in the present embodiment, since more foamed resin is buried near the ground surface, the horizontal earth pressure can be sufficiently absorbed.

The foam 10 in the present embodiment may be composed of only a plurality of foamed resin plates 40, but as shown in FIG. 3, one foamed resin plate 410 and one foamed resin plate 410 are adjacent to each other in the vertical direction. It is preferable that the concrete layer 42 is provided between the foamed resin plate 420 and the other suitable foamed resin plate 420.
Since the foamed resin plate 40 is lightweight, it may float when the surrounding ground is liquefied due to a large earthquake or the like. On the other hand, by providing the concrete layer 42 between one foamed resin plate 410 adjacent to each other in the vertical direction and the other foamed resin plate 420, the weight of the foam 10 is appropriately increased as a whole. It is possible to prevent the foamed resin plate 40 from floating when it is liquefied.
Of the plurality of foamed resin plates 40 constituting the foam 10, a surface protective layer 45 for protecting the uppermost foamed resin plate 430 may be provided on the upper surface of the uppermost foamed resin plate 430 arranged at the uppermost portion. The members constituting the surface protective layer 45 are not particularly limited, but for example, the surface protective layer 45 may be composed of the same concrete as the concrete constituting the concrete layer 42.

As shown in FIG. 3, for example, the concrete layer 42 is located between one foamed resin plate 410 adjacent to each other in the vertical direction and another foamed resin plate 420 at a position located on the lower side. It can be provided on substantially the entire upper surface of the 410 with a predetermined thickness. As a different modification not shown, even if the area of the concrete layer 42 provided between one foamed resin plate 410 and the other foamed resin plate 420 is larger than the area of the upper surface of one foamed resin plate 410. Often, for example, the concrete layer 42 may be provided so as to abut on substantially the entire lower surface of the other foamed resin plate 420.

It is preferable that the frictional force between the foamed resin plate 410 and the concrete layer 42 is increased so that they do not shift from each other. The method for increasing the frictional force between the foamed resin plate 410 and the lower surface of the concrete layer 42 is not particularly limited.
For example, it is possible to satisfactorily join the upper surface side of the foamed resin plate 410 and the lower surface side of the concrete layer 42 by appropriately providing a formwork on the upper surface side of the foamed resin plate 410, pouring concrete into it, and curing it. it can.
Further, as a different method, as shown in FIG. 4a, a plurality of upper surface recesses 43 may be formed in advance on the upper surface of the foamed resin plate 40, and concrete may be poured into the upper surface and cured to form the concrete layer 42. As a result, the poured concrete enters the upper surface recess 43 and hardens, so that the upper surface of the foamed resin plate 40 and the lower surface of the concrete layer 42 can be fitted to the unevenness. As a result, the frictional force in the horizontal direction between the upper surface of one foamed resin plate 410 and the lower surface of the concrete layer 42 can be increased as compared with the embodiment having no upper surface recess 43.

The upper surface recess 43 may be a groove formed on the side surface of the foamed resin plate 40 and extending in an arbitrary direction, or a hole having a predetermined depth.

As an example of a preferred embodiment of the present embodiment, the frictional force between the upper surface of one foamed resin plate 410 and the lower surface of the concrete layer 42 is the frictional force between the lower surface of the other foamed resin plate 420 and the upper surface of the concrete layer 42. Approximately equal aspects can be mentioned.
According to such an aspect, the foam 10 including the foamed resin plate 40 and the concrete layer 42 is well integrated. Therefore, when affected by the back surface earth pressure or the horizontal earth pressure, it is possible to prevent the foamed resin plate 40 and the concrete layer 42 from separating from each other in the foam 10 and collapsing as a whole.

The method of making the frictional force between the upper surface of one foamed resin plate 410 and the lower surface of the concrete layer 42 and the frictional force between the lower surface of the other foamed resin plate 420 and the upper surface of the concrete layer 42 substantially equal is not particularly limited.
For example, by appropriately providing a mold on the upper surface side of one foamed resin plate 410 and pouring concrete, and promptly arranging another foamed resin plate 420 on the poured concrete, the one foamed resin plate 410 can be formed. The frictional force between the upper surface and the lower surface of the concrete layer 42 and the frictional force between the lower surface of the other foamed resin plate 420 and the upper surface of the concrete layer 42 can be made substantially equal.
As a different method, as shown in FIG. 4b, a plurality of upper surface recesses 43 are formed in advance on the upper surface of one foamed resin plate 410, and a plurality of lower surface recesses 44 are formed in advance on the lower surface of the other foamed resin plate 420. You may. Then, concrete is poured onto the upper surface of one foamed resin plate 410, and another foamed resin plate 420 is promptly arranged on the concrete. The poured concrete enters not only the upper surface recess 43 but also the lower surface recess 44 and hardens in that state. As a result, the upper surface of one foamed resin plate 410 and the lower surface of the concrete layer 42, and the lower surface of the other foamed resin plate 420 and the upper surface of the concrete layer 42 are fitted to the unevenness, so that the frictional force in the horizontal direction is surely increased. can do.
Further, one foamed resin plate 410 and the concrete layer 42 may be fastened with a fastening metal fitting.

The foam 10 in the present embodiment including the concrete layer 42 is an anchor (first anchor 51) extending between the concrete layer 42 and the sheet pile wall 20, and / or the ground (earth and sand) on the back surface 13 side of the concrete layer 42 and the foam 10. An anchor (second anchor 52) extending over 200) is provided.
By providing the first anchor 51, the independence of the sheet pile wall 20 can be improved. Further, by providing the second anchor 52, the arrangement stability of the foam 10 is good. By providing the first anchor 51 and the second anchor 52, it is possible to prevent the sheet pile wall 20 from inclining to the side opposite to the mountain side due to the foam 10 having good placement stability, which makes the sheet pile wall 20 more self-supporting. Can be improved.

One end of each of the first anchor 51 and the second anchor 52 is attached to the concrete layer 42. The mounting method is not particularly limited, and for example, one end of the first anchor 51 and the second anchor 52 may be embedded in the concrete layer 42. Both the first anchor 51 and the second anchor 52 are attached to the concrete layer 42 instead of the foamed resin body 40. Therefore, when backside earth pressure or horizontal earth pressure is applied to the sheet pile wall buried structure 110, these anchors are unlikely to come off from the foam 10 and there is no risk of damaging the foam resin 40.

[Third Embodiment]
Next, the sheet pile wall buried structure 120 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a side schematic view showing an example of the sheet pile wall buried structure 120 according to the third embodiment of the present invention.
The sheet pile wall buried structure 120 according to the present embodiment includes a foam 10 embedded in the earth and sand on the back surface 22 side of the sheet pile wall 20, and a foam sheet 15 embedded along the front surface 24 of the sheet pile wall 20. The foam sheet 15 is arranged above the vertical half at least in the area covered by the ground on the front surface 24. In the present embodiment, the lower end of the foam sheet 15 is located above the half in the vertical direction in the area covered by the ground on the front surface 24, and the upper end is the ground surface G.I. L. It is located in the vicinity of.

The sheet pile wall embedded structure 120 provided with the foam sheet 15 absorbs a part of the force applied to the sheet pile wall 20 due to earthquake motion or the like. Therefore, it is possible to prevent the sheet pile wall 20 from being displaced (positionally displaced) or tilted when a large earthquake occurs. Therefore, the sheet pile wall 20 in the present embodiment is excellent in independence.

In the present embodiment, the opposed foam sheet 16 is further provided at a position facing the foam sheet 15 via the sheet pile wall 20. G. of sheet pile wall 20 L. The nearby part tends to be a fulcrum of displacement when a large earthquake occurs. Therefore, it is preferable to further enhance the independence of the sheet pile wall 20 by providing the foam sheet 15 and the opposed foam sheet 16 in a region that tends to serve as a fulcrum.

The size of the foam sheet 15 is not particularly limited, but the thickness of the foam sheet 15 is preferably, for example, 3 cm or more and 20 cm or less, and more preferably 4 cm or more and 15 cm or less. The vertical dimension of the foam sheet 15 is, for example, preferably 30 cm or more and 300 cm or less, and more preferably 50 cm or more and 200 cm or less. The dimensions of the foam sheet 15 in the depth direction of the paper surface are not particularly limited, but it is preferable that the foam sheet 15 is provided continuously or intermittently along the extending sheet pile wall 20. Regarding the dimensions of the opposed foam sheet 16, the above description of the foam sheet 15 is referred to.

In the present embodiment, it is preferable that the foam sheet 15 is provided with a flow path capable of flowing excess pore water in the vertical direction, similarly to the drainage material 30 described above. When the liquefaction phenomenon occurs, the foam sheet 15 having a drainage function can guide excess pore water in the ground on the front surface 24 side upward and discharge it to the ground. The upper end of the foam sheet 15 is G.I. L. Since it is located in the vicinity, it is easy to guide excess pore water from below toward the ground. By using the foam sheet 15 having a drainage function, the softening of the ground due to the liquefaction phenomenon is suppressed. Even if the size of the foam sheet 15 in the vertical direction is, for example, about 30 cm or more and 300 cm or less, if the flow of excess pore water flows from below to the ground in such a region, the flow of excess pore water in the surroundings also flows from below to above ground. Can be induced to.

Although the first to third embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications, improvements, etc., as long as the object of the present invention is achieved. Also includes aspects of. In addition, each configuration of the sheet pile wall buried structure described in the first to third embodiments can be appropriately applied to other embodiments.

The above embodiment includes the following technical ideas.
(1) A sheet pile wall buried structure comprising a sheet pile wall and a foam embedded in earth and sand on the back side of the sheet pile wall.
(2) The sheet pile wall embedded structure according to (1) above, wherein the foam has a through hole penetrating through a first side surface facing the sheet pile wall and a second side surface different from the first side surface. ..
(3) The foam is composed of flat foam resin plates stacked in the vertical direction.
The sheet pile wall-embedded structure according to (1) or (2) above, wherein a concrete layer is provided between one foamed resin plate and another foamed resin plate adjacent to the one foamed resin plate in the vertical direction. ..
(4) Between the one foamed resin plate, another foamed resin plate laminated on the upper side of the one foamed resin plate, and the one foamed resin plate and the other foamed resin plate. With the provided concrete layer,
The sheet pile wall according to (3) above, wherein the frictional force between the upper surface of the one foamed resin plate and the lower surface of the concrete layer is substantially equal to the frictional force between the lower surface of the other foamed resin plate and the upper surface of the concrete layer. Buried structure.
(5) The above-mentioned (3) or (4), wherein an anchor extending between the concrete layer and the sheet pile wall and / or an anchor extending between the concrete layer and the ground on the back surface side of the foam is provided. Sheet pile wall buried structure.
(6) A plurality of drainage materials capable of flowing water in the ground in the vertical direction are arranged from the back surface of the foam toward the mountain side and along the ground surface (1) to (5). The sheet pile wall buried structure according to any one of the above.
(7) With the foam embedded in the earth and sand on the back side of the sheet pile wall,
A foam sheet embedded along the front surface of the sheet pile wall is provided.
The sheet pile wall burying according to any one of (1) to (6) above, wherein the foam sheet is arranged above the half in the vertical direction at least in the area covered by the ground on the front surface. Construction.

10 ... Foam 12 ... First side surface 13 ... Back surface 14 ... Bottom surface 15 ... Foam sheet 16 ... Opposite foam sheet 20 ... Sheet pile wall 21 ... Sheet pile 22 ... Back surface 24 ... Front surface 30 ... Drainage material 31 ... Upper end surface 32 ... Lower end surface 33 ... Groove 34 ... Internal hole 40 ... Foamed resin plate 42 ... Concrete layer 43 ... Top surface recess 44 ... Bottom surface recess 45 ... Surface protection layer 51 ... First anchor 52 ... Second anchor 100, 110, 120 ... Sheet pile wall buried structure 131, 141 ... Through holes 132, 133, 142, 143 ... Opening 200 ... Sediment 210 ... Filling surface 220 ... River 410 ... One foamed resin plate 420 ... Other foamed resin plate 430 ...・ Top foamed resin plate

Claims (5)

It is provided with a sheet pile wall and a foam embedded in the earth and sand on the back side of the sheet pile wall.
With the foam embedded in the earth and sand on the back side of the sheet pile wall,
A first foam sheet embedded along the front surface of the sheet pile wall and a second foam sheet embedded along the back surface facing the front surface via the sheet pile wall are provided.
It said first foam sheet and the second foam sheet are opposed to each other, and at least, a Rukoto in the region covered with the ground of the front are positioned above the first vertical half The characteristic sheet pile wall buried structure. The sheet pile wall embedded structure according to claim 1, wherein the foam has a through hole penetrating through a first side surface facing the sheet pile wall and a second side surface different from the first side surface. The foam is composed of flat foam resin plates stacked in the vertical direction.
The sheet pile wall-embedded structure according to claim 1 or 2, wherein a concrete layer is provided between one foamed resin plate and another foamed resin plate adjacent to the one foamed resin plate in the vertical direction. The sheet pile wall-embedded structure according to claim 3, wherein an anchor extending between the concrete layer and the sheet pile wall and / or an anchor extending between the concrete layer and the ground on the back surface side of the foam is provided. According to any one of claims 1 to 4 , a plurality of drainage materials capable of allowing water in the ground to flow in the vertical direction are arranged from the back surface of the foam toward the mountain side and along the ground surface. The sheet pile wall buried structure described.

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