JP4847265B2 - Retaining wall - Google Patents

Description

  The present invention relates to a retaining wall construction method in which a honeycomb structure filled with earth and sand, crushed stone, and the like is horizontally laminated on a honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure made of a plate-like or net-like polymer material. The present invention also relates to a method for constructing a retaining wall in which the honeycomb structure and the pile described above are combined so that each layer of the honeycomb structure is integrated.

  A honeycomb-shaped three-dimensional reinforcing material having a honeycomb structure made of a plate-like or net-like polymer material has been known, and this honeycomb-shaped three-dimensional reinforcing material is filled with earth, sand, crushed stone, etc. (hereinafter referred to as a honeycomb-shaped three-dimensional reinforcing material). Structures filled with earth and sand, crushed stones, etc. are called “honeycomb structures”). They have been used for ground reinforcements, road base materials, sidewalk foundation materials, temporary roads, and retaining walls.

  Furthermore, a structure in which a plurality of honeycomb structures are stacked 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”). "Page 119"). In addition, by lowering the honeycomb structure placed on the lower honeycomb structure to the natural ground side from the lower part, the honeycomb structure can be formed in a step shape to form a stepped slope. . At that time, the slope of the slope to be constructed can be adjusted by adjusting the receding width.

  However, when a retaining wall is constructed using only a honeycomb structure, it has not been possible to construct a retaining wall with a very high wall height. This is because the coupling element between the upper and lower honeycomb structures is only the frictional force of the soil, and it cannot strongly resist the soil pressure on the back and the direction of the slope, and the integrity of the honeycomb retaining wall structure is weak. It is.

  Furthermore, the honeycomb retaining wall only rested on the ground, and the stability between the ground and the honeycomb retaining wall depended only on the frictional force of the soil. Therefore, when the height of the retaining wall is increased, there is a problem in the stability of the honeycomb retaining wall. Further, there was a problem with the stability of the honeycomb retaining wall, so that when the wall height was increased, the gradient of the honeycomb retaining wall could not be made steep.

  In order to solve these problems, as shown in “Non-Patent Document 2”, “Page 119, Figure-4.9 Method of using geosynthetic (o)”, a honeycomb retaining wall and a geogrid are used together to increase the wall height. A construction method for constructing high retaining walls was also devised. This method uses a honeycomb retaining wall on the slope side and lays a geogrid in the natural ground direction behind it. By using the honeycomb retaining wall and geogrid together, the geogrid anchor effect is given to the honeycomb retaining wall, and the earth pressure applied to the honeycomb retaining wall itself can be reduced by taking the earth pressure on the back surface. was there.

  However, when using a method that uses both the honeycomb retaining wall and geogrid, it was necessary to excavate more ground on the back to secure the space for laying the geogrid on the back of the honeycomb retaining wall. For this reason, this method cannot be used in places where it is not possible to secure a space for laying geogrids, such as when the back ground cannot be excavated. In such places, a high retaining wall with a honeycomb retaining wall is constructed. I had to give up to do.

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

  An object of the present invention is to provide a method for constructing a retaining wall using a honeycomb-shaped three-dimensional reinforcing material having a high wall height and high stability. Another object of the present invention is to provide a method for constructing a steep slope retaining wall using a honeycomb-shaped three-dimensional reinforcing material.

The present invention has been made in order to solve this problem. The invention according to claim 1 is directed to a honeycomb-like three-dimensional reinforcing material having a honeycomb structure made of a plate-like or net-like polymer material, and earth, sand, crushed stone (cement, In a method for constructing a retaining wall in which a honeycomb structure filled with a plurality of layers ( except for mortar filled and solidified) is horizontally stacked, in the process of constructing the retaining wall, the honeycomb structure and immediately above it It is the construction method of the retaining wall characterized by bonding two layers with the honeycomb structure laminated | stacked on a pile by a pile.

  By connecting the two layers using a pile between the honeycomb structure and the honeycomb structure stacked immediately above the honeycomb structure, it is possible to provide unprecedented unity between the honeycomb structures.

In the invention of claim 2, in the process of constructing the retaining wall, the entire length of the pile (pile (a)) is formed on the upper surface portion of each honeycomb structure excluding the honeycomb structure constituting the retaining wall top end . The pile (pile (a)) is struck so that about half of the pile is cut into the honeycomb structure, and the upper half of the pile (pile (a)) is exposed in a protruding shape from the upper surface portion of the honeycomb structure. Mom is a retaining wall construction method of claim 1, wherein the laminating the upper portion Tsugiso honeycomb structure.

The invention according to claim 3 is a pile (pile (b)) longer than the height of one layer of the honeycomb structure from the upper surface portion of the second layer honeycomb structure after the two layers of the honeycomb structure are stacked from the ground. Is piled over the two-layered honeycomb structure, and the third and subsequent layers from the ground are piles longer than the height of one layer of the honeycomb structure every time the honeycomb structure is stacked (pile (b)) The method for constructing a retaining wall according to claim 1, wherein the step of sequentially driving in is repeated .

In addition to the pile (a) and / or the pile (b) , the invention according to claim 4 is a method of laminating at least three layers of honeycomb structures, and then from the upper surface of the uppermost honeycomb structure of the laminate . The method for constructing a retaining wall according to any one of claims 1 to 3, wherein a pile (pile (c)) is driven so as to penetrate at least three honeycomb structures.

The invention of claim 5 wherein the the natural ground of the bottom of the retaining wall, and a honeycomb structure of the first layer to be built immediately above the preceding claims, characterized in that for coupling the pile 4 It is the construction method of the retaining wall in any one of.

In addition, the invention according to claim 6 is directed to the pile (pile (a)) so that about half of the entire length of the pile (pile (a)) is bitten into the natural ground before the honeycomb structure is constructed. out about the upper half of the pile (pile (a)) of claims 1-5, characterized in that constructing a left honeycomb structure at its upper portion in a state exposed from the locations mountain face portion protruding It is the construction method of the retaining wall in any one.

The invention according to claim 7 is a pile (pile (b)) that is longer than the height of one layer of the honeycomb structure from the upper surface portion of the first layer honeycomb structure after the construction of one layer of the honeycomb structure from the ground. The method for constructing a retaining wall according to any one of claims 1 to 6, wherein:

Further, in the invention according to claim 8, in addition to the pile (a) and / or the pile (b), the length of the pile (pile (c)) penetrating the honeycomb structure having at least three layers is driven into the pile. The retaining wall construction method according to claim 1, wherein the retaining wall is longer than a vertical distance from a position to a natural ground.

  The invention according to claim 9 is a retaining wall constructed by the construction method according to any one of claims 1 to 8.

  By connecting the honeycomb structure according to the present invention and the honeycomb structure constructed immediately above by a pile, a honeycomb retaining wall having higher stability than before can be constructed.

  Furthermore, a honeycomb retaining wall having higher stability than the honeycomb retaining wall can be constructed by joining the natural ground and the honeycomb structure with a pile in the honeycomb retaining wall.

  Since it is possible to construct a honeycomb retaining wall having high stability, it is possible to construct a honeycomb retaining wall having a high wall height.

  In addition, since a highly stable honeycomb retaining wall can be constructed, it is possible to construct a honeycomb retaining wall having a steep gradient. By creating a steep retaining wall, the construction range of the retaining wall can be reduced.

  FIG. 1 is a perspective view of a honeycomb-shaped three-dimensional reinforcing material 1 used for a retaining wall of the present invention before expansion. The honeycomb three-dimensional reinforcing material 1 is obtained by bonding a plurality of high-density polyethylene strip materials 2 at bonding sites 3 at regular intervals. The honeycomb-shaped three-dimensional reinforcing material 1 is expanded in the expansion direction 4 to form a honeycomb-shaped cell structure.

  FIG. 2 is a perspective view of the honeycomb three-dimensional reinforcing material 1 after being stretched. When the honeycomb-shaped three-dimensional reinforcing material 1 is stretched, honeycomb-shaped cells 5 are formed. The cell 5 is filled with earth and sand, crushed stone, and the like 6 and compacted to form a rigid honeycomb structure.

  FIG. 3 is a perspective view when the honeycomb structures 7 are stacked. The honeycomb retaining wall of FIG. 3 is formed by stacking and constructing the honeycomb structure 7 of FIG. Stacking can be performed by retreating each layer every time the end portion of the honeycomb structure on the slope surface side is stacked, and various slopes of slope can be formed according to the degree of the retreat.

  FIG. 4 is a perspective view of a honeycomb retaining wall (case 1) showing a process of stacking honeycomb structures using the present invention. The honeycomb retaining wall is constructed by stacking honeycomb structures 7. Each time the honeycomb structure 7 is formed, the pile (a) 8 is driven. In the pile (a) 8, about half of the entire length of the pile is bitten into the honeycomb structure, and the upper half of the pile (a) 8 is exposed in a protruding shape from the upper surface portion of the honeycomb structure. By further stacking the bodies, it is possible to create a bonding relationship between the upper and lower honeycomb structures. In addition, the pile (a) 8 of FIG. 4 represents a portion where the upper hatched portion is applied to the upper honeycomb structure, and the lower portion of the pile (a) 8 represents a portion biting into the lower honeycomb structure.

  FIG. 5 is a cross-sectional view of a honeycomb retaining wall (case 1) illustrating a process of stacking honeycomb structures when the present invention is used. This figure shows the stage where the first-layer honeycomb structure 7 is constructed. After the construction of the first layer honeycomb structure, the pile (a) 8 is driven into the upper surface portion of the honeycomb structure 7. In the pile (a) 8, about half of the entire length of the pile is bitten into the first-layer honeycomb structure 7, and the upper half of the pile (a) 8 protrudes from the upper surface portion of the first-layer honeycomb structure 7. Leave exposed.

  FIG. 6 is a cross-sectional view of a honeycomb retaining wall (case 1) showing a process of stacking honeycomb structures when the present invention is used. This figure shows the stage where the second layer honeycomb structure 7 is laminated. The second-layer honeycomb structure 7 is laminated in a state where the upper half of the pile (a) 8 is exposed in a protruding shape from the upper surface portion of the first-layer honeycomb structure 7. The pile (a) 8 is similarly driven into the upper surface portion of the second-layer honeycomb structure 7. The same work is repeated for the second and subsequent layers to build a honeycomb retaining wall.

  FIG. 7 is a cross-sectional view when the honeycomb retaining wall (case 1) is completed when the present invention is used. No pile is placed on the upper surface of the honeycomb structure 7 at the top of the honeycomb retaining wall.

  FIG. 8 is a cross-sectional view of a honeycomb retaining wall (case 1) when the honeycomb structure and natural ground are provided with a pile by using the present invention. Before constructing the lowermost honeycomb structure of the honeycomb retaining wall, a pile is placed in the natural ground so that the honeycomb structure and the natural ground are connected. In the same manner as described above, the pile (a) 8 is about half of the entire length of the pile is bitten into the lower ground, and the upper half of the pile (a) 8 is exposed in a protruding shape from the upper surface of the ground. By constructing the honeycomb structure at the upper part, it is possible to create a coupling relationship between the natural ground 11 and the honeycomb structure 7. In addition, by making the pile (a) 8 bite into the cut surface 12, a honeycomb retaining wall with higher stability can be constructed.

  FIG. 9 is a cross-sectional view of a honeycomb retaining wall (case 2) illustrating a process of stacking honeycomb structures when the present invention is used. This figure shows the stage where the second layer honeycomb structure 7 is laminated. In this method, two layers of honeycomb structures 7 are laminated from the bottom layer, and a pile (b) 9 longer than the height of the honeycomb structure is driven from the upper surface portion of the honeycomb structure 7 of the second layer, and the upper and lower honeycomb structures 7 The body 7 has a bonding relationship. The pile (b) 9 only needs to straddle two layers of the honeycomb structure.

FIG. 10 is a cross-sectional view of a honeycomb retaining wall (case 2) illustrating a process of stacking honeycomb structures when the present invention is used. This figure shows the stage where the third layer honeycomb structure 7 is laminated. For the third and subsequent layers, each time the one-layer honeycomb structure is laminated, a pile longer than the height of the honeycomb structure 7 is driven, and the process is repeated to the top of the honeycomb retaining wall to construct the honeycomb retaining wall of the present invention. To do.

  FIG. 11 is a cross-sectional view of the honeycomb retaining wall (case 2) upon completion when the present invention is used. In the case of this method, a pile is also placed on the upper surface portion of the honeycomb structure 7 at the top of the honeycomb retaining wall.

  FIG. 12 is a cross-sectional view of the honeycomb retaining wall (case 2) in the case where the connectivity is provided between the honeycomb structure and the natural ground by the pile when the present invention is used. A pile (b) 9 longer than the height of the honeycomb structure is driven from the upper surface of the first honeycomb structure 7 from the bottom layer, and a bonding relationship is established between the bottom layer honeycomb structure 7 and the ground. The pile (b) 9 may penetrate the first layer honeycomb structure and bite into the natural ground. Further, by making the pile (b) 9 bite into the cut surface 12, a honeycomb retaining wall with higher stability can be constructed.

  FIG. 13 shows a method for constructing a honeycomb retaining wall according to the method of Example 1, in which at least three or more layers of honeycomb structures are stacked and then penetrated from the upper surface of the uppermost honeycomb structure. It is sectional drawing of the honeycomb retaining wall (case 3) which used together the construction method of the retaining wall which drives a pile (c) 10 into.

  FIG. 14 shows a method for constructing a honeycomb retaining wall according to the method of Example 2, in which at least three or more layers of honeycomb structures are stacked and then penetrated from the upper surface of the uppermost honeycomb structure. It is sectional drawing of the honeycomb retaining wall (case 4) which used together the construction method of the retaining wall which drives a pile (c) 10 into.

  Any of the construction methods from Case 1 to Case 4 may be used independently, or may be used as a composite construction method by combining the construction methods.

  The piles (a), (b) and (c) should be long. The pile (a) is preferably about the same length as the height of the honeycomb structure 7. The pile (b) is preferably about 1.5 times the height of the honeycomb structure 7. The pile (c) has a length that is at least three times the height of the honeycomb structure. Moreover, although it is desirable that the number of piles to be driven is large, if the number is too large, there is a risk of damaging the already laid honeycomb solid reinforcing material.

  Various types of piles such as atypical reinforcing bars, anchor pins, concrete piles, steel pipe piles, H steel, and wooden piles can be used. Particularly, the piles (a) and (b) are preferably atypical reinforcing bars and anchor pins. The pile (c) is preferably a steel atypical reinforcing bar, anchor pin, or steel pipe pile. Although thicker is better, if it is too thick, there is a risk that the honeycomb-shaped three-dimensional reinforcing material already laid when pile driving will be involved. Therefore, even if it is the thickest, it should not exceed 10 centimeters in diameter. Moreover, the shape of the pile may be hollow.

  Pile materials include metal, resin, concrete, and wood, but materials that do not corrode or rot are good. Moreover, as a placing method, a hitting method, a method using a drill, a cast-in-place pile, and the like can be raised, but any method may be used. Particularly, piles (a) and (b) are preferably hit by a hammer or the like.

  By using the retaining wall construction method of the present invention, a honeycomb structure in which a honeycomb-like three-dimensional reinforcing material having a honeycomb structure made of a plate-like or net-like polymer material and filled with earth, sand, crushed stone, etc. is laminated horizontally. The retaining wall to be constructed can be used to construct a structure having high stability, steep slope, and high wall height.

It is a perspective view before the expansion of the honeycomb-like solid reinforcing material used in the present invention. It is a perspective view at the time of the expansion | deployment of the honeycomb-shaped solid reinforcing material used for this invention. It is a perspective view at the time of stacking the honeycomb structure used for the present invention. It is a perspective view at the time of laminating | stacking a honeycomb structure, hitting the pile of this invention. It is sectional drawing at the time of constructing the 1st layer honeycomb structure of the present invention (example 1). It is sectional drawing at the time of laminating | stacking the 2nd layer honeycomb structure of this invention (case 1). It is sectional drawing at the time of completion of the honeycomb retaining wall (case 1) which nailed the pile of this invention. It is sectional drawing at the time of completion of the honeycomb retaining wall (case 1) which piled up the pile in the natural ground of this invention. It is sectional drawing at the time of laminating | stacking the 2nd layer honeycomb structure of this invention (case 2). It is sectional drawing at the time of laminating | stacking the 3rd layer honeycomb structure of this invention (case 2). It is sectional drawing at the time of completion of the honeycomb retaining wall (case 2) which nailed the pile of this invention. It is sectional drawing at the time of completion of the honeycomb retaining wall (case 2) which piled up the pile in the natural ground of this invention. It is sectional drawing at the time of completion of the honeycomb retaining wall (case 3) which used the case 1 of this invention and the pile (c) together. It is sectional drawing at the time of completion of the honeycomb retaining wall (case 4) which used the case 2 of this invention and the pile (c) together.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Honeycomb-like three-dimensional reinforcement 2 Strip material 3 Bonding part 4 Exhibition direction 5 Cell 6 Sediment, crushed stone, etc. 7 Honeycomb structure 8 Pile (a)
9 Pile (b)
10 Pile (c)
11 Chiyama Formation 12 Cut surface

Claims (9)

Laminate honeycomb structure filled with earth and sand and crushed stone (except for solidified materials such as cement and mortar) on a honeycomb-shaped three-dimensional reinforcing material with a honeycomb structure made of a plate or net-like polymer material. In the retaining wall construction method to be constructed, in the process of constructing the retaining wall , two layers of the honeycomb structure and the honeycomb structure laminated immediately above are joined by a pile. Construction method. In the process of constructing the retaining wall, about half of the total length of the pile (pile (a)) is bitten into the honeycomb structure excluding the honeycomb structure constituting the top of the retaining wall. beat pile (pile (a)) as, the pile (pile (a)) honeycomb structure about the top half of Tsugiso its upper portion remains exposed from the upper surface portion of the honeycomb structure protruding The method for constructing a retaining wall according to claim 1, wherein the bodies are laminated. The honeycomb structure after two-layered laminate from natural ground, the second layer honeycomb structure longer pile from the upper surface portion than the height of the honeycomb structure one layer of (pile (b)) straddling the honeycomb structure of the two layers as implanted, the three subsequent layers from natural ground repeating the steps Yuku by successively implanting longer than the height piles of the honeycomb structure one layer (pile (b)) each time stacking the honeycomb structure 1 layer The method for constructing a retaining wall according to any one of claims 1 and 2. In addition to the pile (a) and / or the pile (b), at least three or more layers of honeycomb structures are stacked, and then the honeycomb structure of at least three layers penetrates from the upper surface of the uppermost honeycomb structure of the stack. A method for constructing a retaining wall according to any one of claims 1 to 3, wherein a pile (pile (c)) is driven as described above. And the natural ground of the bottom of the retaining wall, the construction of retaining wall according to any one of claims 1 to 4, characterized in that for coupling the first layer of the honeycomb structure and the pile to be built immediately above it Method. Before building the honeycomb structure, it beats pile as about half of the total length of the pile (pile (a)) is cutting into the natural ground in the natural ground (pile (a)), the piles (piles (a)) retaining wall construction method as claimed in any one of claims 1 to 5, about the upper half, characterized in that constructing a honeycomb structure on its upper portion remains exposed from the locations mountain face portion protruding . A pile (pile (b)) longer than the height of one layer of the honeycomb structure is driven from the upper surface portion of the first layer honeycomb structure after one layer of the honeycomb structure is constructed from the natural ground. The construction method of the retaining wall in any one of 6 to 6. In addition to the pile (a) and / or the pile (b), the length of the pile (pile (c)) penetrating at least three layers of the honeycomb structure is longer than the vertical distance from the position where the pile is driven to the natural ground. The method for constructing a retaining wall according to any one of claims 1 to 7, wherein the retaining wall is long.   A retaining wall constructed by the construction method according to claim 1.