JP6298250B2 - Retaining wall connection structure - Google Patents

Description

  The present invention relates to a geogrid / honeycomb retaining wall in which a honeycomb retaining wall in which a honeycomb-shaped three-dimensional reinforcing material is extended and filled with a filler and laminated and a geotextile are combined.

  Conventionally, a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure made of a plate-like or net-like polymer material is known, and this honeycomb-shaped three-dimensional reinforcing material is filled with earth and sand, crushed stone, etc. A structure filled with earth and sand, crushed stone, etc. is referred to as a “honeycomb structure”). It has been used for ground reinforcement, road base material, sidewalk foundation material, construction road, and retaining wall materials.

  Further, a structure in which a honeycomb structure is laminated in a plurality of layers up to a certain height and used as a retaining wall (hereinafter referred to as “honeycomb retaining wall”) is also well known (Patent Document 1, Non-Patent Document 1 119). page). In addition, the honeycomb structure layer placed on the lower honeycomb structure layer is retracted to the natural mountain side from the lower portion, thereby forming the honeycomb structure layer in a stepped manner and creating a stepped slope. be able to. At that time, the slope of the slope to be constructed can be adjusted by adjusting the receding width.

  In addition, a method of using a honeycomb retaining wall and a geogrid together has been studied as a measure for strengthening the bonding relationship between the honeycomb retaining wall and the natural ground and thereby enhancing the stabilization of the honeycomb retaining wall. On page 119 of Non-Patent Document 2, “Figure-4.9 Method using geosynthetic (o)”, a geogrid is sandwiched and connected between the honeycomb structure layers constituting the honeycomb retaining wall, and the geogrid is connected to a natural ground. A method is disclosed in which the honeycomb retaining wall is stabilized by an anchor effect caused by biting in and a soil pressure reducing effect caused by the geogrid sharing a part of the backside earth pressure.

A similar method is also described in Patent Document 2 for a method in which a honeycomb retaining wall and a geogrid are used in combination. In Patent Document 2,
“It is a reinforced earth wall construction method in which wall surfaces are laminated to form a retaining wall, and the soil wall is reinforced by the retaining wall, and the wall member is formed by joining a plurality of substantially strip-shaped belt members at predetermined intervals. The sheet member is formed of a geocell that can form a soil-and-sand restraining portion that restrains the earth and sand by separating the non-joined portions of the belt members from each other, and is formed in a substantially lattice shape between the stacked geocells It is characterized in that the retaining wall is formed by sandwiching the front side of the geogrid formed in and embedding the rear side of the geogrid in the embankment. ''
However, it is substantially the same as the method of Non-Patent Document 2.

Utility Model No. 2582267 JP 2012-167508 A "Basic Engineering, December 1996" 119 pages The Geotechnical Society “Introduction to Reinforcement Earth” The Geotechnical Society 1999

  The retaining wall composed of the honeycomb structure (Geocell) and Geogrid in Non-Patent Document 2 and Patent Document 2 is the front side (wall surface side) of the Geogrid laid on the back surface between each honeycomb structure layer constituting the honeycomb retaining wall. ) Between the honeycomb structure and the geogrid is not sufficient. That is, the honeycomb retaining wall and the geogrid on the back surface depend on the self-weight of the honeycomb structure layer placed on the geogrid and the frictional force composed of the filler of the honeycomb structure. The connection is not sufficient. In addition, when an excessive force is applied in the direction of the wall surface of the honeycomb retaining wall, there is a possibility that the geogrid on the back surface may come off.

  An object of the present invention is to provide a method for connecting a honeycomb retaining wall and a geogrid that maintains the connection between the honeycomb retaining wall and a geogrid laid on the back surface of the honeycomb retaining wall even when excessive earth pressure is applied in the direction of the wall surface. Is to provide a connector.

  The present inventor attaches a horizontal bar material to the end of the geogrid wall surface to connect the geogrid and the honeycomb structure of the geogrid / honeycomb retaining wall, and sandwiches the geogrid with the horizontal bar material between the honeycomb structures. A vertical pile that has a pile part that penetrates the upper and lower honeycomb structures and forms a full length that penetrates the geogrid sandwiched between the honeycomb structure layers, and a head that is above half of the total length and wider than the pile part. The inventors have found that the above problems can be solved by attaching a material, and have completed the present invention.

The invention described in claim 1
A honeycomb structure layer having a honeycomb structure in which a honeycomb structure in which a filler is filled in a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure formed of a strip material made of a plate-like or net-like polymer material is stacked on a wall surface portion; A geogrid / honeycomb retaining wall having a geogrid arranged substantially horizontally on the back surface of the structure layer (natural ground side),
The geogrid is a synthetic resin sheet having a rod having a regular lattice structure in which tensile members are firmly coupled or united at an intersection, and the rod crosses like a grid,
The wall-side end of the geogrid is sandwiched between laminated honeycomb structures (hereinafter referred to as “geogrid narrowed portion”),
The geogrid narrowed portion is arranged near the geogrid wall surface side end portion with a horizontal bar material substantially parallel to the geogrid wall surface side edge portion, and the geogrid edge portion with the edge of the horizontal bar material as a fulcrum Is folded into the back (natural ground side)
Each of the geogrid narrowed portions is in contact with the honeycomb structure that passes through the inside of the geogrid on the back side (the ground mountain side) of the horizontal bar material and immediately below the geogrid. Having a pile-shaped vertical pile material substantially perpendicular to the honeycomb structure layer penetrating into the honeycomb structure;
The vertical pile member is a geogrid / honeycomb retaining wall whose height is shorter than the height of two layers of the honeycomb structure .

  The present invention relates to connecting a honeycomb structure in which geogrid / honeycomb retaining walls are stacked and a geogrid wall side end sandwiched between honeycomb structure layers, and an upper and lower honeycomb structure sandwiching the geogrid and the geogrid. The gist of the invention is to attach a vertical pile material straddling the body.

  When the vertical pile material is in direct contact with the end of the geogrid wall, stress concentrates on one point of the geogrid and the geogrid may break. Therefore, it is possible to prevent one point concentration of stress on the geogrid by sandwiching a horizontal bar as a cushioning material between the geogrid and the vertical pile material.

The invention according to claim 2
The height of the strip material adjacent to the geogrid narrowed portion of the honeycomb-shaped three-dimensional reinforcing material is smaller than the height of the strip material of the honeycomb-shaped three-dimensional reinforcing material by the thickness of the geogrid narrowed portion. The geogrid / honeycomb retaining wall according to Item 1.

  If the height of the honeycomb structure in contact with the geogrid sandwiched part is not lowered by the thickness of the geogrid sandwiched part, the back part of the honeycomb structure will be the thickness of the geogrid sandwiched part. A step will occur. Therefore, the width of the strip material of the honeycomb-like three-dimensional reinforcing material in the portion in contact with the geogrid sandwiched portion may be reduced by the thickness of the geogrid narrowed portion.

The invention described in claim 3
The vertical pile material is a pile portion that constitutes the entire length of the vertical pile material, and a vertical pile having a cylindrical or flat head that is wider than half the entire length of the vertical pile material and wider than the pile portion. The geogrid / honeycomb retaining wall according to claim 1, which is a material.

The invention according to claim 4
The geogrid / honeycomb retaining wall according to any one of claims 1 to 3, wherein the geogrid is one made of an olefin resin, a polyester resin, or an aramid resin coated with an olefin resin.

  A vertical pile material consists of the pile part which comprises the full length, and the head wider than the said pile part which is above half of a full length. The upper half of the vertical pile material penetrates into the upper honeycomb structure layer, and the lower half penetrates into the lower honeycomb structure layer. The lower half of the vertical pile is preferably piled so as to penetrate into the honeycomb structure that has already been filled with the filler, while the upper half of the vertical pile is a honeycomb that is not filled with filler during construction. Since only the three-dimensional reinforcing material is stacked from above, there is no problem even if it is wider than the pile portion. The reason why the upper half of the vertical pile material is wider than the pile portion is to receive the earth pressure as much as possible. The shape of the head is preferably cylindrical or flat.

The invention according to claim 5
The geogrid / honeycomb retaining wall according to any one of claims 1 to 4, wherein the geogrid / honeycomb retaining wall is a geogrid / honeycomb retaining wall having a pile penetrating at least three honeycomb structure layers.

The invention described in claim 6
A honeycomb structure layer having a honeycomb structure in which a honeycomb structure in which a filler is filled in a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure formed of a strip material made of a plate-like or net-like polymer material is stacked on a wall surface portion; A method for constructing a geogrid / honeycomb retaining wall having a geogrid arranged substantially horizontally on the back surface (the natural ground side) of the structure layer,
The geogrid is a synthetic resin sheet having a rod having a regular lattice structure in which tensile members are firmly coupled or united at an intersection, and the rod crosses like a grid,
Exhibiting honeycomb-shaped three-dimensional reinforcement,
Filling the expanded honeycomb reinforcing material with a filler to form a honeycomb structure,
Lay the geogrid on the back of the honeycomb structure (ground side) so that it partially overlaps the honeycomb structure,
A horizontal bar is arranged at the end of the geogrid substantially parallel to the end of the geogrid, and the end of the geogrid is folded to the back (the ground) side with the horizontal bar as an edge.
A process of setting a honeycomb structure on the honeycomb structure by driving a vertical pile material on the honeycomb structure while penetrating through the inside of the geogrid on the back side (ground mountain side) of the horizontal bar. Item 6. A method for constructing a geogrid / honeycomb retaining wall according to any one of Items 1 to 5.

  According to the present invention, it is possible to provide a geogrid / honeycomb retaining wall that has an integrity of the honeycomb structure layer on the wall surface portion and the geogrid on the back surface portion and is resistant to earth pressure from the back surface.

It is a perspective view before the expansion of a honeycomb-shaped solid reinforcing material. It is a perspective view at the time of extending a honeycomb-like solid reinforcing material. It is a top view of a geogrid. It is sectional drawing of the conventional geogrid honeycomb retention wall. It is sectional drawing of the honeycomb geogrid retaining wall of this invention. It is a perspective view of a horizontal bar. It is the perspective view which showed an example of the vertical pile material which can be utilized for this invention. It is an expanded sectional view of the connection part of a honeycomb structure and geogrid. It is a perspective view at the time of mounting a horizontal bar on a geogrid. It is a perspective view at the time of placing a horizontal bar material on a honeycomb structure while wrapping with a geogrid and driving a vertical pile material from above. It is an expanded sectional view at the time of placing the geogrid which wrapped the horizontal bar material on the honeycomb structure, and installing the vertical pile material. It is sectional drawing at the time of mounting the geogrid which wrapped the horizontal bar material on the honeycomb structure, installing a vertical pile material, and mounting a honeycomb-shaped solid reinforcing material. It is a completed sectional view at the time of giving a long pile to the honeycomb geogrid retaining wall of the present invention. It is a top view of the apparatus used for the test. It is sectional drawing of the apparatus used for the test. It is a perspective view at the time of cutting out the honeycomb-shaped solid reinforcing material used for the test. It is a front view of the vertical pile material and horizontal bar material which were used for the test. It is the graph which showed the result of the tension test.

  Hereinafter, embodiments of the present invention will be described. Note that this embodiment is merely an embodiment for carrying out the present invention, and the present invention is not limited by this embodiment, and various modified embodiments can be made without departing from the gist of the present invention. Is possible.

The present invention has a honeycomb structure layer in which a honeycomb structure in which a filler is filled in a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure made of a strip material made of a plate-like or net-like polymer material on the wall surface is provided. And a geogrid / honeycomb retaining wall having a geogrid arranged substantially horizontally on the back surface (natural ground side) of the honeycomb structure layer,
The geogrid is a synthetic resin sheet having a rod having a regular lattice structure in which tensile members are firmly coupled or united at an intersection, and the rod crosses like a grid,
The wall-side end of the geogrid is sandwiched between laminated honeycomb structures (hereinafter referred to as “geogrid narrowed portion”),
The geogrid narrowed portion is arranged near the geogrid wall surface side end portion with a horizontal bar material substantially parallel to the geogrid wall surface side edge portion, and the geogrid edge portion with the edge of the horizontal bar material as a fulcrum Is folded into the back (natural ground side)
Each of the geogrid narrowed portions is in contact with the honeycomb structure that passes through the inside of the geogrid on the back side (the ground mountain side) of the horizontal bar material and immediately below the geogrid. Having a pile-shaped vertical pile material substantially perpendicular to the honeycomb structure layer penetrating into the honeycomb structure;
The vertical pile member is a geogrid / honeycomb retaining wall whose height is shorter than the height of two layers of the honeycomb structure .

  The present invention relates to connecting a honeycomb structure in which geogrid / honeycomb retaining walls are stacked and a geogrid wall side end sandwiched between honeycomb structure layers, and an upper and lower honeycomb sandwiching the geogrid and the geogrid. Although the gist of the invention is to attach a vertical pile material straddling the structure, such a case has not been known so far.

Hereinafter, the honeycomb-shaped three-dimensional reinforcing material used in the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a honeycomb-shaped three-dimensional reinforcing material before expansion. The honeycomb-shaped three-dimensional reinforcing material 1 is obtained by bonding a plurality of strip materials 2 at bonding sites 4 at regular intervals. The honeycomb-shaped three-dimensional reinforcing material 1 is expanded in the extending direction a to form a honeycomb-shaped cell structure.

  Resin is preferable as the material used for the honeycomb-shaped three-dimensional reinforcing material, and among the resins, high-density polyethylene is preferable.

  The strip material 2 is provided with holes 3 for discharging water accumulated in the cells. The hole may have any size or shape. The number of holes is preferably large, but if it is too large, the strength of the strip material is lowered, so that the number should not exceed 40% of the area of the strip material. Further, the holes may be arranged in series or in a staggered manner.

  FIG. 2 is a perspective view when the honeycomb-shaped three-dimensional reinforcing material shown in FIG. 1 is stretched. When the honeycomb-shaped three-dimensional reinforcing material 1 is stretched, honeycomb-shaped cells 5 are formed. As a general method for using the honeycomb-shaped three-dimensional reinforcing material, a honeycomb structure having rigidity is formed by filling the honeycomb-shaped three-dimensional reinforcing material cell 5 with the filler up to the height of the cell and compacting. A honeycomb retaining wall can be formed by stacking and constructing the honeycomb structures approximately horizontally. At the time of stacking, a step can be formed by retreating each layer every time the end of the honeycomb structure on the slope side is stacked, and various slopes can be formed according to the degree of the retreat.

Hereinafter, the geogrid used in the present invention will be described with reference to the drawings.
FIG. 3 is a plan view of a geogrid used in the present invention. “Geogrid 6” is a sheet made of a synthetic polymer with a regular lattice structure in which tensile members are firmly bonded or integrated at the intersections (“Introduction to Geosynthetics” edited by the Japan Branch of the International Geosynthetics Society). This is a resin sheet for civil engineering in which resin rods are crossed in a grid shape, which is described as “Science and Technology Book, 2001, page 34, line 1”. As shown in FIG. 3, the vertical and horizontal rods are regularly arranged. However, the present invention is not limited to this, and there are various types such as those having different aspect ratios and grids having triangular grids. There are various types of geogrids, such as those made of olefin resin, and those in which a core material of polyester resin or aramid resin is coated with olefin resin. In the present invention, any geogrid is applicable. Typical examples of geogrids include Torigrid (made by Okasan Livic), Tensor (made by Mitsui Chemicals), Adem (made by Maeda Kosen), Cell Force (made by Asahi Kasei Geotech), etc. Is also applicable to the present invention.

  FIG. 4 is a sectional view of a conventional geogrid / honeycomb retaining wall. In the example of FIG. 4, the case where the number of cells shown in the cross-sectional view of the honeycomb structure is two is illustrated, but the number of cells is not limited to this and may be any number. A stronger honeycomb retaining wall can be constructed by attaching the geogrid 6 to the back surface (natural ground side) of the honeycomb retaining wall constructed by stacking the honeycomb structure 7 substantially horizontally. This geogrid and honeycomb structure The retaining wall consisting of is called a geogrid / honeycomb retaining wall. When constructing a geogrid / honeycomb retaining wall, the honeycomb retaining wall is composed of the honeycomb retaining wall part and the geogrid part connected to each other. It has been performed that the end portion on the slope side of the geogrid is sandwiched between the body layers (honeycomb structure-geogrid connecting portion 9). However, it is not possible to exert a sufficient force against the pulling force due to the arc-slip collapse that is assumed to occur in the geogrid part simply by pinching. In the present invention, a method for connecting the honeycomb structure layer and the geogrid portion was studied and the problem was solved.

  FIG. 5 is a sectional view of the honeycomb geogrid retaining wall of the present invention. In the example of FIG. 5, the case where the number of cells shown in the cross-sectional view of the honeycomb structure is two is illustrated, but the number of cells is not limited to this and may be any number. In the honeycomb geogrid retaining wall of the present invention, in order to connect the rear end portion of the honeycomb structure layer and the slope end portion of the geogrid, the horizontal rod 10 and the vertical rod 10 are connected to the honeycomb structure-geogrid connection portion 9. Pile material 11 is used. It is desirable to attach a temporary fixing pile 14 to the end of the geogrid.

Hereinafter, the horizontal bar used in the present invention will be described with reference to the drawings.
FIG. 6 is a perspective view of the horizontal bar. In FIG. 6, the horizontal bar material which chamfered the rectangular cross section by flat shape was illustrated. The horizontal bar 10 is a long bar. The cross-sectional shape is not limited to a rectangle, but may be any shape such as a circle, a triangle, or a trapezoid, but it is preferable that the surface in contact with the geogrid is flat. The size of the rod-shaped material having a rectangular cross section is preferably about 5 mm in length, about 30 mm to 100 mm in width, and about 1 m in length. The material is not particularly limited, but it is preferably made of a light and highly corrosion-resistant resin, and an olefin resin is particularly preferable.

Hereinafter, the vertical pile material used for this invention is demonstrated using figures.
FIG. 7 is a perspective view showing an example of a vertical pile material usable in the present invention. In FIG. 7, four types of vertical pile materials from A to D are illustrated, but are merely examples, and are not limited to the examples in FIG. 7. The vertical pile material has at least a pile portion 13. The upper half of the vertical pile material penetrates into the upper honeycomb structure layer, and the lower half penetrates into the lower honeycomb structure layer. The pile portion may not be linear as shown in FIG. 7C but may be crank-shaped. The material of the pile portion is preferably made of a metal having high strength, but may be made of resin if the strength is sufficient.

  Furthermore, it is desirable that the vertical pile material 11 includes a pile portion 13 that constitutes the entire length, and a head portion 12 that is above half of the entire length and is wider than the pile portion 13. The lower half of the vertical pile material 11 is preferably pile-shaped in order to penetrate into the honeycomb structure that has already been filled with the filler, while the upper half of the vertical pile material 11 is filled with the filler during construction. Since only the non-honeycomb three-dimensional reinforcing material 1 is piled up from above, there is no problem even if it is wider than the pile portion 13. The reason why the upper half of the vertical pile member 11 is wider than the pile portion 13 is to receive the earth pressure as much as possible. The head 12 is preferably cylindrical (FIG. 7B) or flat (FIG. 7D). The material of the head 12 is not particularly limited, but is preferably made of a metal having high strength, but may be made of resin if the strength is sufficient.

  Here, the vertical pile material 11 illustrated in FIG. 7 will be described. FIG. 7A is a vertical pile member 11 composed only of deformed reinforcing bars (pile portion 13). FIG. 7B is a vertical pile member 11 in which a resin-made cylindrical head portion 12 is attached above the deformed reinforcing bar (pile portion 13). FIG. 7C is a vertical pile member 11 (without a head) obtained by bending a circular rope (pile portion 13) into a crank shape. FIG. 7D shows a vertical pile member 11 with a steel blade-like head 12 above the round rope (pile portion 13).

  FIG. 8 is an enlarged cross-sectional view of a connecting portion between the honeycomb structure and the geogrid. It is the same as the conventional honeycomb geogrid retaining wall that is disposed so as to be sandwiched between the honeycomb structure layers in which the honeycomb structure 7 is laminated. In the present invention, there is a device at the end of the wall surface side of the geogrid 6. That is, the horizontal bar 10 is wound around the wall-side end of the geogrid 6 and has a structure in which the wall-side end of the geogrid 6 is folded back to the back so that the side surface of the horizontal bar becomes an edge. . The vertical pile material 11 is arranged on the back side (natural mountain side) of the horizontal bar 10 in which the geogrid 6 is wound. The lower half of the vertical pile member 11 is in the honeycomb structure 7 below the geogrid 6, and the upper half of the vertical pile member 11 is in the honeycomb structure 7 placed on the geogrid 6.

  The reason why the horizontal bar 10 is attached is to disperse the stress concentration applied to the geogrid 6. If there is no horizontal bar material 10 and the vertical pile material 11 and the geogrid are in direct contact, the honeycomb retaining wall is pulled to the wall surface side, while the tensile force generated when the geogrid resists the back side is the vertical pile. There is a possibility that the geogrid 6 breaks due to concentration at one point where the material 11 and the geogrid 6 contact each other. On the other hand, when the horizontal bar 10 is interposed between the vertical pile material 11 and the geogrid 6, the force related to the geogrid 6 is once transmitted to the horizontal bar 10, It will be transmitted to the vertical pile material 11, and the break of the geogrid 6 can be suppressed.

  In addition, the reason why the lower half of the vertical pile member 11 has a pile shape and the upper half has a head 12 is that the lower honeycomb structure 7 is already filled with a filler at the time of construction. Therefore, it is not necessary to be pile-shaped in order to cover the honeycomb-shaped three-dimensional reinforcing material 1 on the upper half of the vertical pile material 11 when constructing, while making it easier to drive by making it into a pile shape, On the other hand, the vertical pile material has a larger area so that stress can be received.

  9 to 12, a method for connecting the honeycomb structure layer and the geogrid portion in the geogrid / honeycomb retaining wall will be described following the construction procedure.

  FIG. 9 is a perspective view when a horizontal bar is placed on the geogrid. The horizontal bar 10 used in the present invention is placed at a position slightly on the back side from the end on the slope side of the geogrid 6.

FIG. 10 is a perspective view when the horizontal bar is placed on the honeycomb structure while being wrapped with a geogrid, and the vertical pile material is driven from above.
The end of the geogrid 6 on the slope side is covered with the end of the geogrid 6 on the slope side so that the cross-section is exactly U-shaped with the mounting position of the crossbar 10 as a fulcrum. Fold it in. The end of the geogrid 6 slope side that wraps the horizontal bar 10 is placed on the honeycomb structure 7 that has already been installed. After placing the end of the geogrid 6 slope side on the honeycomb structure 7, the vertical pile material 11 is driven into the back side of the horizontal bar 10. At this time, the vertical pile material 11 is inserted in the honeycomb structure 7 with the lower half of the half of the entire length, and the upper half is exposed.

FIG. 11 is an enlarged cross-sectional view when a vertical pile material is installed by placing a geogrid wrapped with horizontal bars on a honeycomb structure.
FIG. 11 shows the slope side on the left side and the back side (natural ground side) on the right side, and this figure is an enlarged view of the connecting portion between the honeycomb structure 7 and the geogrid 6. A geogrid 6 is placed on the honeycomb structure 7. The end of the slope side of the geogrid 6 is folded back to the back side while the horizontal bar 10 is wound around. Longitudinal so as to penetrate the two-layer geogrid of the folded geogrid and the geogrid placed on the lower honeycomb structure so that the vertical pile material 11 is in contact with the wall on the back side of the retaining wall of the horizontal bar 10 Pile material 11 is driven. The vertical pile material 11 is driven into the honeycomb structure 7 leaving a height of about half of the total height. With the above structure, the honeycomb structure 7 and the geogrid 6 are connected.

FIG. 12 is a cross-sectional view when placing a geogrid wrapped with horizontal bars on a honeycomb structure, installing a vertical pile member, and placing a honeycomb solid reinforcing member. After the geogrid 6 is installed on the honeycomb structure 7, the expanded honeycomb three-dimensional reinforcing material 1 is placed on the honeycomb structure 7. Thereafter, the cells of the honeycomb-shaped three-dimensional reinforcing material 1 are filled with a filler to produce a honeycomb structure layer.
Hereinafter, the geogrid / honeycomb retaining wall of the present invention is constructed by repeating the above series of operations.

  FIG. 13 is a completed cross-sectional view when a long pile is added to the honeycomb geogrid retaining wall of the present invention. In the example of FIG. 13, the case where the number of cells shown in the cross-sectional view of the honeycomb structure is four is illustrated, but the number of cells is not limited to this and may be any number. As shown in the figure, it is possible to enhance the stability of the honeycomb geogrid retaining wall by providing a long pile 15 that penetrates the honeycomb structure three or more layers as necessary.

  Examples and comparative examples will be described below.

  The connection strength test of the honeycomb structure of the honeycomb geogrid retaining wall of the present invention and the geogrid was conducted. In the experiment, a connecting part between the honeycomb structure layer and the geogrid is built in the earth tub, and after applying a certain upper load to the test body, a tensile force is applied to the geogrid to pull the connecting part, This was done by measuring the tensile load and displacement at that time.

  FIG. 14 shows a plan view of the apparatus used for the test, and FIG. 15 shows a cross-sectional view of the apparatus used for the test. In FIG. 16, the perspective view at the time of cutting out the honeycomb-shaped solid reinforcing material used for the test was shown.

  As shown in FIGS. 14 and 15, the inner dimensions of the earth tub used for the test are a depth of 1518 mm, a width of 300 mm, and a height of 702 mm. The honeycomb test body 18 that is a part of the honeycomb three-dimensional reinforcing material 1 (width 1 cell, depth 2 cells) is stacked in the earth tub, and the geogrid 6 is sandwiched between the honeycomb test bodies to be stacked at that time. Was sandwiched.

  As shown in FIG. 16, the honeycomb test body used in the test was cut out from the honeycomb-shaped three-dimensional reinforcing material 1 and used. The cut cell size is one cell wide and two cells deep, and specific dimensions are a width of 320 mm, a depth of 576 mm, and a height of 300 mm.

  The Geogrid used for the test is Trigrid (registered trademark) EX manufactured by Okasan Livic Co., Ltd., which has a product standard strength of 95 kN / m, a width of 300 mm, and a length of 3400 mm. The embankment material used for the test is river sand with high water permeability.

Hereafter, the test method of an Example is demonstrated.
A honeycomb test piece (50 mm high) 19 cut to a height of 50 mm is placed in a predetermined position in the earth tub, and inside the cell of the honeycomb test specimen (50 mm high) 19 and in the earth basin behind the honeycomb test specimen (50 mm high) 19 The embankment material 17 was rolled out and compacted by human power to a thickness of 50 mm. A honeycomb test body 18 was placed on the honeycomb retaining wall at a position where the wall slope of the honeycomb retaining wall was 1: 0.5. Then, the embankment material 17 is spread out in the cells of the honeycomb test body 18 and the soil tank on the back of the honeycomb test body 18 and compacted by human power so as to be 150 mm thick, and this procedure is repeated twice to obtain a 300 mm high honeycomb test body. The embankment material 17 was filled to the level of. The geogrid 6 is laid on it, the horizontal bar 10 is wound around the geogrid, both ends of the geogrid are connected to the drawing device 16, and the vertical pile material 11 is connected to the back of the horizontal bar 10 with the total height of the vertical pile material 11. It installed so that it might bite into the honeycomb test body 18 of the lower half to about half.

  Further, the honeycomb test body 18 of the next layer is installed on the honeycomb test body layer so that the wall surface gradient of the honeycomb retaining wall is 1: 0.5, and the inside of the cells of the honeycomb test body 18 and the back surface of the honeycomb test body 18 are arranged. The embankment material 17 was sprinkled into the earth tub and compacted by human power to a thickness of 150 mm, and this procedure was repeated twice to fill the embankment material 17 to the level of the 300 mm high honeycomb specimen. Further, a honeycomb test body (50 mm height) 19 cut to a height of 50 mm was placed on the honeycomb test body layer, and the inside of the cells of the honeycomb test body (50 mm height) 19 and the back surface of the honeycomb test body (50 mm height) 19 were installed. The embankment material 17 was sprinkled into the earthen tank and compacted by human power so as to be 50 mm thick.

  The final form of the test body constructed by the above procedure is as follows: first layer-honeycomb test body (50 mm height), second layer-honeycomb test body (300 mm height), third layer-honeycomb test body (300 mm height) ) 4th layer-honeycomb test body (50mm height), total 4 layers of honeycomb retaining wall is built in the soil tank, and geogrid is installed on the back from the 2nd layer and 3rd layer The geogrid end is connected to the drawing device 16.

A plywood 19 was further placed on the above test body, and an upper load g was loaded from above the plywood 19. The magnitude of the upper load was 12 kN / m ² and a load of 3.5 kN was loaded on the soil tank. This overload is a value of a vertical load acting on the geogrid within a range of 1 m from the wall surface when the unit volume weight is 18 kN / m ³ and the wall surface gradient is 1: 0.5.

Geogrid tensile test measures and records the tensile load and displacement in the tensioning device,
The tensile load was increased by 2 kN and held for 1 minute until no increase in the tensile load was observed or the displacement reached 180 mm.

The test was conducted with different shapes and combinations of connecting members (vertical pile material, horizontal bar material) in order to clarify the structure of the connecting member that exerts sufficient tensile force. The shape and material of the implemented vertical pile material and horizontal bar material are shown in FIG.
Table 2 shows the combinations of the vertical pile members and the horizontal bars of each example and comparative example.

A tensile test was carried out on Examples 1 to 6 by combining the vertical pile materials shown in FIG. 17 and Table 1 and the horizontal bar materials shown in FIG. 17 and Table 2. Moreover, the tension test was implemented also about the comparative example 1 which does not use a vertical pile material only with a horizontal bar.
Table 3 shows the combinations of vertical pile material and horizontal bar material under each test condition, and the test results.
FIG. 18 shows the load P and the displacement amount δ when the tensile test is performed under each test condition. Table 3 shows the maximum value (maximum load) of the load P and the displacement amount δ (maximum displacement amount).

  The greater the load P and the smaller the displacement δ, the higher the connection strength. This test confirmed that the presence of the vertical pile material improved the maximum load by about twice and the maximum displacement by about 4/5.

  By using the geogrid / honeycomb retaining wall provided with the horizontal bar material and the vertical pile material of the present invention, a more stable geogrid / honeycomb retaining wall can be provided.

DESCRIPTION OF SYMBOLS 1 Honeycomb-shaped solid reinforcement material 2 Strip material 3 Hole 4 Coupling part 5 Cell 6 Geogrid 7 Honeycomb structure layer 8 Earthmoving 9 Honeycomb structure-Geogrid connection part 10 Horizontal bar material 11 Vertical pile material 12 Head 13 Pile part 14 Temporary pile 15 Long pile 16 Pull-out device 17 Filling material 18 Honeycomb specimen 19 Honeycomb specimen (50 mm height)
20 Plywood a Spreading direction b Placement direction c Rolling direction d Placement direction e Driving direction
f Placement direction g Topload h Extraction direction

Claims (6)

A honeycomb structure layer having a honeycomb structure in which a honeycomb structure in which a filler is filled in a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure formed of a strip material made of a plate-like or net-like polymer material is stacked on a wall surface portion; A geogrid / honeycomb retaining wall having a geogrid arranged substantially horizontally on the back surface of the structure layer (natural ground side),
The geogrid is a synthetic resin sheet having a rod having a regular lattice structure in which tensile members are firmly coupled or united at an intersection, and the rod crosses like a grid,
The wall-side end of the geogrid is sandwiched between laminated honeycomb structures (hereinafter referred to as “geogrid narrowed portion”),
The geogrid narrowed portion is arranged near the geogrid wall surface side end portion with a horizontal bar material substantially parallel to the geogrid wall surface side edge portion, and the geogrid edge portion with the edge of the horizontal bar material as a fulcrum Is folded into the back (natural ground side)
Each of the geogrid narrowed portions is in contact with the honeycomb structure that passes through the inside of the geogrid on the back side (the ground mountain side) of the horizontal bar material and immediately below the geogrid. Having a pile-shaped vertical pile material substantially perpendicular to the honeycomb structure layer penetrating into the honeycomb structure;
A geogrid / honeycomb retaining wall in which the height of the vertical pile material is shorter than the height of two layers of the honeycomb structure .   The height of the strip material adjacent to the geogrid narrowed portion of the honeycomb-shaped three-dimensional reinforcing material is smaller than the height of the strip material of the honeycomb-shaped three-dimensional reinforcing material by the thickness of the geogrid narrowed portion. Item 10. The geogrid / honeycomb retaining wall according to item 1.   The vertical pile material is a pile portion that constitutes the entire length of the vertical pile material, and a vertical pile having a cylindrical or flat head that is wider than half the entire length of the vertical pile material and wider than the pile portion. The geogrid / honeycomb retaining wall according to claim 1, which is a material.   The geogrid / honeycomb retaining wall according to any one of claims 1 to 3, wherein the geogrid is one made of an olefin resin, a polyester resin, or an aramid resin coated with an olefin resin.   The geogrid / honeycomb retaining wall according to any one of claims 1 to 4, wherein the geogrid / honeycomb retaining wall is a geogrid / honeycomb retaining wall having a pile penetrating at least three honeycomb structure layers. A honeycomb structure layer having a honeycomb structure in which a honeycomb structure in which a filler is filled in a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure formed of a strip material made of a plate-like or net-like polymer material is stacked on a wall surface portion; A method for constructing a geogrid / honeycomb retaining wall having a geogrid arranged substantially horizontally on the back surface (the natural ground side) of the structure layer,
The geogrid is a synthetic resin sheet having a rod having a regular lattice structure in which tensile members are firmly coupled or united at an intersection, and the rod crosses like a grid,
Exhibiting honeycomb-shaped three-dimensional reinforcement,
Filling the expanded honeycomb reinforcing material with a filler to form a honeycomb structure,
Lay the geogrid on the back of the honeycomb structure (ground side) so that it partially overlaps the honeycomb structure,
A horizontal bar is arranged at the end of the geogrid substantially parallel to the end of the geogrid, and the end of the geogrid is folded to the back (the ground) side with the horizontal bar as an edge.
A process of setting a honeycomb structure on the honeycomb structure by driving a vertical pile material on the honeycomb structure while penetrating through the inside of the geogrid on the back side (ground mountain side) of the horizontal bar. Item 6. A method for constructing a geogrid / honeycomb retaining wall according to any one of items 1 to 5.