WO2011102482A1 - L-shaped retaining wall and l-shaped retaining wall unit - Google Patents

L-shaped retaining wall and l-shaped retaining wall unit Download PDF

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Publication number
WO2011102482A1
WO2011102482A1 PCT/JP2011/053558 JP2011053558W WO2011102482A1 WO 2011102482 A1 WO2011102482 A1 WO 2011102482A1 JP 2011053558 W JP2011053558 W JP 2011053558W WO 2011102482 A1 WO2011102482 A1 WO 2011102482A1
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WO
WIPO (PCT)
Prior art keywords
retaining wall
bottom plate
wall
shaped retaining
pressure receiving
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Application number
PCT/JP2011/053558
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French (fr)
Japanese (ja)
Inventor
太 野本
貞夫 ▲高▼村
Original Assignee
Nomoto Futoshi
Takamura Sadao
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Application filed by Nomoto Futoshi, Takamura Sadao filed Critical Nomoto Futoshi
Publication of WO2011102482A1 publication Critical patent/WO2011102482A1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/02—Retaining or protecting walls

Definitions

  • the present invention relates to an L-shaped retaining wall and an L-shaped retaining wall unit that are used as earth retaining in land preparation or the like.
  • an L-shaped retaining wall consisting of a vertical wall installed in the vertical direction and a bottom plate extending in the horizontal direction starting from the lower end of the vertical wall is used.
  • This L-type retaining wall generally has a precast reinforced concrete structure, and is used by installing a pre-manufactured L-type retaining wall on a foundation constructed on the ground.
  • Such an L-shaped retaining wall is formed so that the vertical wall and the bottom plate are orthogonal to each other (a right-angled L-shaped retaining wall), and formed so that the vertical wall and the bottom plate form an obtuse angle of about 105 degrees. (Obtuse angle L-type retaining wall).
  • the obtuse L-shaped retaining wall is more stable and stronger than the right-angled L-shaped retaining wall in that the horizontal component of the bottom plate reaction force can be used as a resistance to sliding (sliding in the horizontal direction). Is also known to be excellent (see, for example, Patent Document 1).
  • the obtuse angle L-type retaining wall can be reduced in weight while improving stability against sliding and falling compared to the right-angled L-type retaining wall. Moreover, since the depth of penetration on the vertical wall side can be reduced, the required excavation amount can be reduced.
  • the conventional obtuse L-shaped retaining wall has stability superior to that of the right-angled L-shaped retaining wall, the stability when an excessive load is applied due to, for example, an earthquake is not sufficient, and recent large earthquakes Along with the heightened awareness of disaster prevention that accompanies outbreaks, further improvements in the stability of retaining walls are desired.
  • the present invention intends to provide an L-type retaining wall and an L-shaped retaining wall unit with improved stability against sliding and falling.
  • the present invention is an L-shaped retaining wall comprising a vertical wall installed in the vertical direction and a bottom plate extending in the horizontal direction with the lower end of the vertical wall as a base end, and the upper surface of the bottom plate is It is formed to be inclined so as to form an obtuse angle with respect to the vertical wall, and a pressure receiving wall that receives a part of earth pressure on the bottom plate protrudes upward at a tip portion of the bottom plate. It is an L-shaped retaining wall.
  • the present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving surface of the pressure receiving wall is inclined so as to be gradually separated from the vertical wall from the base end to the tip end of the pressure receiving wall. To do.
  • the present invention is also characterized in that, in the L-shaped retaining wall of the above means, the upper surface of the bottom plate is formed so as to form an angle of 95 to 115 degrees with respect to the vertical wall.
  • the present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving wall is formed integrally with the bottom plate.
  • the present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving wall is constituted by another member attached to the bottom plate so as to be swingable and fixable at a predetermined angle.
  • the present invention is also characterized in that, in the L-shaped retaining wall of the above means, the lower surface of the bottom plate is formed in a stepped shape in which a plurality of horizontal planes are arranged at different heights along the upper surface of the bottom plate.
  • the lower surface of the bottom plate is positioned at a position lower than the first horizontal surface on the first horizontal surface provided on the base end side of the bottom plate and on the distal end side of the bottom plate. And a second horizontal plane provided.
  • a substantially wedge-shaped fixing member is fixed to a mounting surface formed so that the lower surface of the bottom plate is inclined so as to form an obtuse angle with respect to the vertical wall.
  • a substantially wedge-shaped fixing member is fixed to a mounting surface formed so that the lower surface of the bottom plate is inclined so as to form an obtuse angle with respect to the vertical wall.
  • the present invention also includes an L-type retaining wall of the above means, and a base portion composed of a plurality of sandbags laid on the ground side in accordance with the bottom surface shape of the bottom plate of the L-shaped retaining wall.
  • the L-type retaining wall unit is composed of a plurality of sandbags laid on the ground side in accordance with the bottom surface shape of the bottom plate of the L-shaped retaining wall.
  • the base portion is configured in a step shape so that a side surface of a part of the sandbag faces a step portion between the plurality of horizontal surfaces of the bottom plate. It is characterized by that.
  • the sandbag connects a rectangular parallelepiped bag, a rectangular guide frame accommodated in the sandbag bag, and the adjacent guide frames.
  • a connecting member, and the base portion is configured by stacking a plurality of the sandbags arranged in a lattice in a state where adjacent sandbags are connected to each other by the connecting member.
  • (A) It is a perspective view of the L-shaped retaining wall of embodiment of this invention.
  • (B) It is a side view of an L-shaped retaining wall. It is the perspective view which showed the L-shaped retaining wall unit of embodiment of this invention. It is the figure which showed the sandbag which comprises a base part. It is the figure which showed an example of the state which installed the L-shaped retaining wall unit as a earth retaining.
  • (A) And (b) It is the figure which showed the example which comprised the pressure receiving wall from another member from the L-type retaining wall main body.
  • (A) And (b) It is the figure which showed the example which formed the lower surface of the baseplate of the L-shaped retaining wall in the shape similar to the conventional L-shaped retaining wall. It is the figure which showed the example which formed the lower surface of the baseplate of the L-shaped retaining wall in step shape by fixing another member.
  • FIG. 1A is a perspective view of the L-shaped retaining wall 1 of the present embodiment
  • FIG. 1B is a side view of the L-shaped retaining wall 1.
  • the L-type retaining wall 1 has a precast reinforced concrete structure. As shown in these drawings, the L-type retaining wall 1 extends in the horizontal direction with the vertical wall 11 extending in the vertical direction and the lower end of the vertical wall 11 as the base end.
  • the bottom plate 12 and a pressure receiving wall 13 that protrudes obliquely upward from the front end portion of the bottom plate 12.
  • the vertical wall 11 is a portion installed in the vertical direction when the L-shaped retaining wall 1 is used as a retaining wall.
  • the surface on the opposite side of the bottom plate 12 is the front surface 11a exposed to the outside, and the front surface 11a is a smooth flat surface or a surface that is appropriately decorated.
  • the back surface 11b of the vertical wall 11 is appropriately provided with a reinforcing rib, a connecting portion for connecting adjacent L-shaped retaining walls 1 or the like as necessary.
  • the vertical wall 11 is provided with a drain hole penetrating between the front surface 11a and the back surface 11b at an appropriate position as necessary.
  • the bottom plate 12 extends in a substantially horizontal direction from the back surface 11 b side of the lower end portion of the vertical wall 11.
  • the upper surface 12a of the bottom plate 12 is formed so as to form an angle ⁇ with respect to the vertical wall.
  • the angle ⁇ is not particularly limited, and can be set as appropriate according to the internal friction angle of the soil particles to be buried on the bottom plate 12. However, considering the case of using general soil and installing (covering soil) on the upper surface 12a of the bottom plate 12, the angle ⁇ is preferably set within a range of 95 to 115 degrees, It is more preferable to set within the range.
  • the bottom surface 12b of the bottom plate 12 includes a first horizontal plane 12b1 provided on the base end side of the bottom plate 12, a second horizontal plane 12b2 provided on the distal end side of the bottom plate 12, and a step between the first horizontal plane 12b1 and the second horizontal plane 12b2. 12b3, and has a stepped shape along the upper surface 12b.
  • the first horizontal plane 12b1 and the second horizontal plane 12b2 are formed so as to be substantially orthogonal to the vertical wall, that is, substantially horizontal when installed, and the second horizontal plane 12b2 is the first horizontal plane 12b1. It is provided at a lower position.
  • the step portion 12b3 is formed substantially parallel to the vertical wall 11, that is, in a substantially vertical direction.
  • the step portion 12b3 is not limited to this and may be formed obliquely.
  • Reinforcing ribs and connecting portions are provided on the upper surface 12a of the bottom plate 12 as necessary.
  • the bottom plate 12 may be provided with a hole for injecting mortar or the like below the lower surface 12b after the L-type retaining wall 1 is installed on the foundation.
  • the pressure receiving wall 13 receives a part of the earth pressure by inclining the upper surface 12a of the bottom plate 12.
  • the first horizontal plane 12b1 and the second horizontal plane 12b2 that are substantially horizontal when installed on the lower surface 12b of the bottom plate 12
  • the construction of the foundation is facilitated, and a plurality of L-type retaining walls 1 that are installed adjacent to each other. This makes it easy to adjust the height and face of the machine and improve the workability of the installation work.
  • the step portion 12b3 resistance to sliding is generated in a deep portion of the soil, and stability against sliding is improved.
  • the pressure receiving wall 13 has a solidified region on the bottom plate 12 where the soil particles are solidified by receiving the restraining pressure by receiving the soil particles sliding down on the upper surface 12a of the bottom plate 12 which is an inclined surface. It is for generating.
  • the pressure receiving wall 13 protrudes obliquely upward from the front end portion of the bottom plate 12.
  • the pressure receiving surface 13a which is a surface which receives earth pressure in the pressure receiving wall 13 is in the state inclined so that it may gradually separate from the said vertical wall 11 toward the front-end
  • the earth pressure (restraint pressure) applied to the pressure receiving wall 13 is increased by inclining the pressure receiving surface 13a in this way.
  • the inclination angle of the pressure receiving surface 13a is not particularly limited, and may be set as appropriate according to the internal friction angle of the soil particles to be backfilled on the bottom plate 12.
  • the shape, length, material, and the like of the pressure receiving wall 13 are not particularly limited, and may be any shape as long as the pressure receiving surface 13a can be appropriately inclined. .
  • FIG. 2 is a perspective view showing the L-shaped retaining wall unit 2.
  • the L-type retaining wall unit 2 includes an L-shaped retaining wall 1 and a base portion 3 that constitutes a foundation that is laid on the ground side and on which the L-shaped retaining wall 1 is placed.
  • the base portion 3 is configured in a stepped manner in accordance with the lower surface 12b of the bottom plate 12 of the L-type retaining wall 1 by arranging a plurality of rectangular parallelepiped sandbags 30 in a lattice shape and stacking a plurality of steps.
  • FIG. 3 is a view showing a sandbag 30 that constitutes the foundation 3.
  • the sandbag 30 includes a rectangular parallelepiped sandbag 31, a rectangular guide frame 32 housed inside the sandbag 31, and a connecting member 33 that connects adjacent guide frames 32 to each other. It has.
  • the guide frame 32 functions as a guide for aligning a plurality of sandbags placed on the bottom of the sandbag bag 31, and is opposed to four plate-like ribs 32a that are combined with each other to form a rectangular frame. It is comprised from the beam 32b which connects the plate-shaped rib 32a to perform and maintains the shape of the guide frame 32.
  • FIG. The guide frame 32 is fixed to the sandbag bag 31 by connecting a fixing piece (not shown) from the outside of the sandbag bag 31 to the guide frame 32 through the sandbag bag 31.
  • the connecting member 33 includes claws 33a at both ends, and the adjacent guide frames 32 are connected to each other by engaging the claws 33a with the guide frames 32. Thereby, the plurality of sandbags 30 arranged in a lattice form are in a state where adjacent sandbags 30 are connected to each other.
  • the connection member 33 connects the sandbags 30 adjacent to each other as described above, thereby integrating the plurality of sandbags 30 and improving the strength.
  • the connecting member 33 has a function of ensuring an appropriate gap between the sandbags 30 when the sandbags 30 are arranged.
  • the sandbag 30 of the present embodiment is a patented invention by a part of the inventors of the present invention.
  • Japanese Patent No. 4019100 refers to Japanese Patent No. 4019100.
  • FIG. 4 is a view showing an example of a state where the L-type retaining wall unit 2 is installed as a retaining wall.
  • the foundation portion 3 is configured by first arranging and stacking a plurality of sandbags 30 on the ground 40.
  • the sandbags 30 may be stacked in a line in the vertical direction, or the positions of the sandbags 30 may be shifted and stacked in a staggered manner.
  • the number of steps on which the sandbags 30 are stacked may be appropriately set according to the state of the ground 40.
  • the sandbag 30 may be disposed only directly under the L-shaped retaining wall 1. In this case, the amount of excavation can be reduced and the number of work steps can be reduced.
  • a step 34 is formed in accordance with the shape of the lower surface 12b of the bottom plate 12 of the L-type retaining wall 1 (that is, the first horizontal surface 12b1, the second horizontal surface 12b2, and the step portion 12b3).
  • This step 34 may be formed by a single-stage sandbag 30 as shown in the figure, or when the size of the sandbag 30 is smaller than the L-shaped retaining wall 1, it is formed by a plurality of stages of sandbag 30. May be.
  • the L-shaped retaining wall 1 is placed on the foundation part 3 in accordance with the shape of the step 34 on the upper part of the foundation part 3. Specifically, the L-shaped retaining wall 1 is placed in a state where the step 12b3 of the bottom 12 of the L-shaped retaining wall 1 is opposed to the side surface 30a of the sandbag 30 in the step 34 portion of the base portion 3. At this time, mortar, gravel, or the like is filled between the lower surface 12b of the L-shaped retaining wall 1 and the sandbag 30 of the foundation 3 as necessary. In addition, when performing height alignment or surface alignment between adjacent L-shaped retaining walls 1, a spacer or the like is appropriately inserted between the first horizontal plane 12 b 1 or the second horizontal plane 12 b 2 and the base portion 3. Finally, the back soil 41 is covered on the back surface 11b side of the vertical wall 11 of the L-shaped retaining wall 1, and the front soil 42 is covered on the front surface 11a side.
  • the foundation part 3 is constituted by a plurality of sandbags 30, it is possible to easily construct the foundation part 3 regardless of the state of the ground 40.
  • the sandbag 30 since the sandbag 30 includes the guide frame 32 and the connecting member 33, the sandbag 30 can be connected and arranged quickly at an appropriate interval even if the ground 40 is soft. As a result, the foundation 3 having sufficient strength can be constructed on the soft ground 40.
  • the foundation part 30 comprised from several sandbags 30 unlike the conventional obtuse angle L-type retaining wall. It can be easily installed on top. Moreover, the force F2 received from the side surface 30a of the sandbag 30 with which the step part 12b3 opposes can be stably exhibited as the resistance force with respect to sliding with the force F1 which the front 11a lower part of the vertical wall 11 receives from the front soil 42.
  • the L-type retaining wall 1 of the present embodiment is provided with the pressure-receiving wall 13 so that a part of the earth pressure of the back soil 41 on the bottom plate 12 is received by the pressure-receiving surface 13a, and the stability of the L-type retaining wall 1 is improved. I try to increase it. Specifically, the soil particles on the bottom plate 12 slide along the inclination of the upper surface 12a in the direction indicated by the arrow A in the figure, but this slip is limited by the pressure receiving surface 13a, and the soil particles are shown in the figure. It will be restrained in the solidified region 50.
  • the upper surface 51 of the solidified region 50 is an inclined surface inclined at an angle based on the internal friction angle of the back soil 41. The soil particles in the solidified region 50 are solidified due to the generation of interparticle friction by the upper back soil 41 and the earth pressure due to the overload acting as additional stress.
  • the solidified region 50 that is solidified integrally with the L-type retaining wall 1 by the earth particles being compacted is generated on the bottom plate 12. Accordingly, the back soil 41 slides in the direction indicated by the arrow B in FIG. As a result, as shown in the figure, the height H1 at which the vertical wall 11 receives the back soil 41 and the earth pressure P due to the overload is in a range smaller than the retaining height H2, so that the L-shaped retaining wall 1 The earth pressure applied to the vertical wall 11 will be reduced.
  • the horizontal component F4 of the bottom plate reaction force F3 is slid similarly to the conventional obtuse angle L-type retaining wall. It can be used as a resistance force against.
  • the solidification region 50 is generated on the bottom plate 12 by providing the pressure receiving wall 13, and the stability of the L-type retaining wall 1 against sliding and falling is further enhanced. Further, even when an excessive load is applied to the L-type retaining wall 1 due to an earthquake or the like, for example, this load can be appropriately dispersed by the solidified region 50 and the earth pressure P received by the vertical wall 11 can be reduced. Therefore, it is possible to provide stability that is higher than that of the conventional obtuse angle L-type retaining wall.
  • the pressure receiving wall 13 is formed integrally with the bottom plate 12, that is, the L-type retaining wall 1 is precast into a shape having the pressure receiving wall 13 on the bottom plate 12, but the pressure receiving wall 13 is L-shaped. You may make it comprise from a member different from the retaining wall 1 main body.
  • FIG. 5 (a) and 5 (b) are views showing an example in which the pressure receiving wall 13 is formed of a member different from the L-type retaining wall 1 main body.
  • the pressure receiving wall 13 is swingably attached to the distal end portion of the bottom plate 12 via a swing pin 13b as shown in FIG.
  • the pressure receiving wall 13 is fixed at a predetermined angle by a known method such as bolt, engagement, adhesion, or the like. Fixed.
  • the pressure receiving wall 13 is formed of a member different from the main body of the L-shaped retaining wall 1 and is swingably mounted, whereby a plurality of L-shaped retaining walls 1 are stored or stored during transportation of the L-shaped retaining wall 1. Can be stacked in a compact manner without being affected by the pressure receiving wall 13.
  • the inclination angle of the pressure receiving surface 13a can be set as appropriate, and the shape and length of the pressure receiving wall 13 can be easily changed.
  • the pressure receiving wall 13 in this case may be comprised from reinforced concrete like the L-type retaining wall 1 main body, and may be comprised from metals, such as iron, and another material.
  • the pressure receiving wall 13 as another member may be fixed to the main body of the L-type retaining wall 1 so as to be detachable by bolts, engagement, or the like, instead of being fixed so as to be swingable.
  • the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in a stepped shape.
  • the present invention is not limited to this, and the lower surface 12b is formed with a conventional L-shaped retaining wall. You may make it comprise in the shape similar to a wall.
  • FIGS. 5A and 5B are diagrams showing an example in which the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in the same shape as a conventional L-shaped retaining wall.
  • FIG. 8B shows an example in which the lower surface 12 b is formed to form an obtuse angle with the vertical wall 11.
  • the L-type retaining wall 1 may be configured by fixing the pressure receiving wall 13 as a separate member to the tip of the bottom plate of the existing obtuse L-shaped retaining wall with a bolt or the like. Further, the L-type retaining wall 1 may be configured by adding an inclined surface to the upper surface of the bottom plate of the existing right-angle L-shaped retaining wall and fixing the pressure receiving wall 13 as another member to the tip portion.
  • FIG. 7 is a view showing an example in which the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in a step shape by fixing another member.
  • the L-shaped retaining wall 1 is fixed in a substantially wedge shape to a mounting surface 12c on the lower side of the bottom plate 12 that is formed so as to form an obtuse angle with respect to the vertical wall 11.
  • the member 14 By fixing the member 14, the lower surface 12b of the bottom plate 12 is formed in a step shape.
  • a known fixing method such as a bolt, engagement, or adhesion can be employed.
  • the pressure receiving wall 13 may be formed by fixing another member.
  • the L-type retaining wall 1 may be easily manufactured and transported.
  • the L-type retaining wall 1 of the present invention can be configured by utilizing an existing obtuse L-shaped retaining wall.
  • the mounting surface 12c in this case does not have to be an inclined surface so that all surfaces form an obtuse angle with respect to the vertical wall 11, and as shown in the figure, for example, a surface orthogonal to the vertical wall 11 Etc., surfaces with different angles may be included.
  • a protrusion or the like for fixing the fixing member 14 to the attachment surface 12c may be provided.
  • the L-type retaining wall 1 includes the vertical wall 11 installed in the vertical direction, the bottom plate 12 extending in the horizontal direction with the lower end portion of the vertical wall 11 as the base end, An upper surface 12 a of the bottom plate 12 is formed so as to be inclined with an obtuse angle with respect to the vertical wall 11, and an earth pressure on the bottom plate 12 is set at the tip of the bottom plate 12.
  • a pressure receiving wall 13 that receives the portion protrudes upward.
  • Such a configuration makes it possible to reduce the earth pressure P applied to the vertical wall 11, and to improve the stability against sliding and falling more than before.
  • the load can be appropriately dispersed and the earth pressure P received by the vertical wall 11 can be reduced. It becomes possible to provide stability more than an obtuse L-shaped retaining wall.
  • the height and width of the pressure receiving wall 13 can be set to appropriate dimensions according to the nature of the back soil 41 to be backfilled and the required degree of stability.
  • the pressure receiving surface 13a of the pressure receiving wall 13 is inclined so as to be gradually separated from the vertical wall 11 from the base end to the tip end of the pressure receiving wall 13.
  • the inclination angle of the pressure receiving surface 13a can be set to an appropriate angle so as to maximize the restraining effect in accordance with the soil particles of the ground installed on the bottom plate 12. That is, the pressure receiving surface 13a may be inclined so as to gradually approach the vertical wall 11 from the proximal end to the distal end of the pressure receiving wall 13 depending on the properties of the soil particles, or is parallel to the vertical wall 11, for example. May be.
  • the solidified region 50 that contributes to the improvement of stability is reliably generated on the bottom plate 12. be able to.
  • the pressure receiving wall 13 is formed integrally with the bottom plate 12, the pressure receiving wall 13 can be configured to be lightweight while having sufficient strength.
  • the pressure receiving wall 13 may be constituted by another member attached to the bottom plate 12 so as to be swingable and fixed at a predetermined angle.
  • the plurality of L-shaped retaining walls 1 can be stored and transported in a compactly stacked state.
  • the inclination angle of the pressure receiving surface 13a can be set to an appropriate angle according to the soil particles of the ground installed on the bottom plate 12, and the shape and length of the pressure receiving wall 13 can be easily changed. .
  • the lower surface 12b of the bottom plate 12 is formed in a staircase shape in which a plurality of horizontal surfaces 12b1 and 12b2 are arranged at different heights along the upper surface 12a of the bottom plate 12. For this reason, the workability
  • the lower surface 12b of the bottom plate 12 is formed in a two-step shape including the first horizontal surface 12b1, the second horizontal surface 12b2, and the step portion 12b3.
  • the present invention is not limited to this.
  • the lower surface 12b may be configured in three or more steps.
  • this invention is not limited to this, L on the general foundation by concrete placement etc.
  • the mold retaining wall 1 may be installed.
  • the bottom surface 12b of the bottom plate 12 has a first horizontal plane 12b1 provided on the base end side of the bottom plate 12, and a second horizontal plane 12b2 provided at a position lower than the first horizontal plane 12b1 on the distal end side of the bottom plate 12. Configured. That is, in the present invention, the above-described effects can be exhibited with a relatively simple configuration, and the manufacturing cost of the L-shaped retaining wall 1 can be reduced.
  • the lower surface 12b of the bottom plate 12 is formed in a step shape by fixing a substantially wedge-shaped fixing member 14 to a mounting surface 12c formed to be inclined with an obtuse angle with respect to the vertical wall 11. It may be.
  • the L-type retaining wall 1 may be easily manufactured and transported.
  • the L-type retaining wall unit 2 includes a plurality of sandbags 30 laid on the ground 40 side in accordance with the shape of the L-shaped retaining wall 1 and the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1.
  • a basic part 3 made of By setting it as such a structure, irrespective of the state of the ground 40, the base part 3 can be constructed
  • the base part 3 is comprised in step shape so that the side surface 30a of some sandbags 30 may oppose the step part 12b3 between the some horizontal surfaces 12b1 and 12b2 of the baseplate 12.
  • FIG. 12 b 3 and the side surface 30 a of the sandbag 30 can stably exert a resistance to sliding, and the stability of the L-type retaining wall 1 can be further enhanced.
  • the sandbag 30 includes a rectangular parallelepiped sandbag 31, a rectangular guide frame 32 housed in the sandbag 31, and a connecting member 33 that connects adjacent guide frames 32 to each other, and a base portion 3 is configured by stacking a plurality of sandbags 30 arranged in a lattice in a state where adjacent sandbags 30 are connected to each other by a connecting member 33.
  • the sandbag 30 can be laid very easily regardless of the state of the ground 40. Moreover, since the sandbag 30 can be arrange
  • the L-type retaining wall and the L-shaped retaining wall unit of the present invention are not limited to the above-described embodiments, and do not depart from the spirit of the present invention. Of course, various changes can be made.
  • the L-type retaining wall and the L-type retaining wall unit of the present invention can be used in various civil engineering fields in addition to land creation.

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  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Mining & Mineral Resources (AREA)
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  • Retaining Walls (AREA)

Abstract

Provided are an L-shaped retaining wall and an L-shaped retaining wall unit such that the stability against sliding and toppling is enhanced. This L-shaped retaining wall (1) comprises an upright wall (11) which is installed vertically, and a bottom plate (12) which is provided in such a way as to extend horizontally starting at the lower end of the upright wall (11). The upper surface (12a) of the bottom plate (12) is formed obliquely in such a way as to have an obtuse angle with respect to the upright wall (11). At the edge of the bottom plate (12), a pressure wall (13) which is subjected to part of soil pressure acting on the bottom plate (12) is provided in such a way as to project upward.

Description

Ｌ型擁壁およびＬ型擁壁ユニットL-type retaining wall and L-type retaining wall unit
　本発明は、土地造成等において土留めとして使用されるＬ型擁壁およびＬ型擁壁ユニットに関する。 The present invention relates to an L-shaped retaining wall and an L-shaped retaining wall unit that are used as earth retaining in land preparation or the like.
　従来、宅地や道路等の土地造成工事においては、垂直方向に設置される縦壁と、この縦壁の下端部を基端として横方向に延設される底板とからなるＬ型擁壁が使用されている。このＬ型擁壁は、一般的にプレキャスト鉄筋コンクリート構造となっており、地盤上に構築した基礎の上に予め製造されたＬ型擁壁を設置することで使用される。 Conventionally, in land preparation work such as residential land and roads, an L-shaped retaining wall consisting of a vertical wall installed in the vertical direction and a bottom plate extending in the horizontal direction starting from the lower end of the vertical wall is used. Has been. This L-type retaining wall generally has a precast reinforced concrete structure, and is used by installing a pre-manufactured L-type retaining wall on a foundation constructed on the ground.
　このようなＬ型擁壁には、縦壁と底板が直交するように形成されたもの（直角Ｌ型擁壁）と、縦壁と底板が１０５度程度の鈍角をなすように形成されたもの（鈍角Ｌ型擁壁）とがある。このうち、鈍角Ｌ型擁壁は、底板反力の水平方向分力を滑動（水平方向の滑り）に対する抵抗力として活用することができる等、安定性および強度の面で直角Ｌ型擁壁よりも優れていることが知られている（例えば、特許文献１参照）。すなわち、鈍角Ｌ型擁壁は、直角Ｌ型擁壁に比べ、滑動や転倒に対する安定性を高めながらも軽量化することが可能となっている。また、縦壁側の根入れ深さを浅くすることができるため、必要掘削量を低減することが可能となっている。 Such an L-shaped retaining wall is formed so that the vertical wall and the bottom plate are orthogonal to each other (a right-angled L-shaped retaining wall), and formed so that the vertical wall and the bottom plate form an obtuse angle of about 105 degrees. (Obtuse angle L-type retaining wall). Of these, the obtuse L-shaped retaining wall is more stable and stronger than the right-angled L-shaped retaining wall in that the horizontal component of the bottom plate reaction force can be used as a resistance to sliding (sliding in the horizontal direction). Is also known to be excellent (see, for example, Patent Document 1). That is, the obtuse angle L-type retaining wall can be reduced in weight while improving stability against sliding and falling compared to the right-angled L-type retaining wall. Moreover, since the depth of penetration on the vertical wall side can be reduced, the required excavation amount can be reduced.
実登３０２２０７２号公報Noto 3022072 gazette
　しかしながら、従来の鈍角Ｌ型擁壁は、直角Ｌ型擁壁に勝る安定性を備えてはいるものの、例えば地震等により過大な荷重が加わった場合の安定性は十分ではなく、近年の大地震の発生に伴う防災意識の高まりと共に、擁壁に対するさらなる安定性の向上が望まれている。 However, although the conventional obtuse L-shaped retaining wall has stability superior to that of the right-angled L-shaped retaining wall, the stability when an excessive load is applied due to, for example, an earthquake is not sufficient, and recent large earthquakes Along with the heightened awareness of disaster prevention that accompanies outbreaks, further improvements in the stability of retaining walls are desired.
　本発明は、斯かる実情に鑑み、滑動および転倒に対する安定性を高めたＬ型擁壁およびＬ型擁壁ユニットを提供しようとするものである。 In view of such circumstances, the present invention intends to provide an L-type retaining wall and an L-shaped retaining wall unit with improved stability against sliding and falling.
　本発明は、垂直方向に設置される縦壁と、前記縦壁の下端部を基端として横方向に延設される底板と、からなるＬ型擁壁であって、前記底板の上面は、前記縦壁に対して鈍角をなすように傾斜して形成され、前記底板の先端部には、前記底板上の土圧の一部を受ける受圧壁が上方に向けて突設されることを特徴とする、Ｌ型擁壁である。 The present invention is an L-shaped retaining wall comprising a vertical wall installed in the vertical direction and a bottom plate extending in the horizontal direction with the lower end of the vertical wall as a base end, and the upper surface of the bottom plate is It is formed to be inclined so as to form an obtuse angle with respect to the vertical wall, and a pressure receiving wall that receives a part of earth pressure on the bottom plate protrudes upward at a tip portion of the bottom plate. It is an L-shaped retaining wall.
　本発明はまた、上記手段のＬ型擁壁において、前記受圧壁の受圧面は、前記受圧壁の基端から先端に向けて漸次前記縦壁から離隔するように傾斜していることを特徴とする。 The present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving surface of the pressure receiving wall is inclined so as to be gradually separated from the vertical wall from the base end to the tip end of the pressure receiving wall. To do.
　本発明はまた、上記手段のＬ型擁壁において、前記底板の上面は、前記縦壁に対して９５乃至１１５度の角度をなすように形成されることを特徴とする。 The present invention is also characterized in that, in the L-shaped retaining wall of the above means, the upper surface of the bottom plate is formed so as to form an angle of 95 to 115 degrees with respect to the vertical wall.
　本発明はまた、上記手段のＬ型擁壁において、前記受圧壁は、前記底板と一体的に形成されることを特徴とする。 The present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving wall is formed integrally with the bottom plate.
　本発明はまた、上記手段のＬ型擁壁において、前記受圧壁は、揺動自在且つ所定の角度で固定可能に前記底板に取付けられた別部材から構成されることを特徴とする。 The present invention is also characterized in that, in the L-type retaining wall of the above means, the pressure receiving wall is constituted by another member attached to the bottom plate so as to be swingable and fixable at a predetermined angle.
　本発明はまた、上記手段のＬ型擁壁において、前記底板の下面は、複数の水平面を前記底板の上面に沿って高さを変えて配置した階段状に形成されることを特徴とする。 The present invention is also characterized in that, in the L-shaped retaining wall of the above means, the lower surface of the bottom plate is formed in a stepped shape in which a plurality of horizontal planes are arranged at different heights along the upper surface of the bottom plate.
　本発明はまた、上記手段のＬ型擁壁において、前記底板の下面は、前記底板の前記基端側に設けられる第１水平面と、前記底板の先端側において前記第１水平面よりも低い位置に設けられる第２水平面と、を有して構成されることを特徴とする。 According to the present invention, in the L-type retaining wall of the above means, the lower surface of the bottom plate is positioned at a position lower than the first horizontal surface on the first horizontal surface provided on the base end side of the bottom plate and on the distal end side of the bottom plate. And a second horizontal plane provided.
　本発明はまた、上記手段のＬ型擁壁において、前記底板の下面は、前記縦壁に対して鈍角をなすように傾斜して形成された取付面に略楔形状の固定部材を固定することにより、階段状に形成されることを特徴とする。 According to the present invention, in the L-shaped retaining wall of the above means, a substantially wedge-shaped fixing member is fixed to a mounting surface formed so that the lower surface of the bottom plate is inclined so as to form an obtuse angle with respect to the vertical wall. Thus, it is formed in a step shape.
　本発明はまた、上記手段のＬ型擁壁と、前記Ｌ型擁壁が有する前記底板の下面形状に合わせて地盤側に敷設される複数の土嚢からなる基礎部と、を有することを特徴とする、Ｌ型擁壁ユニットである。 The present invention also includes an L-type retaining wall of the above means, and a base portion composed of a plurality of sandbags laid on the ground side in accordance with the bottom surface shape of the bottom plate of the L-shaped retaining wall. The L-type retaining wall unit.
　本発明はまた、上記手段のＬ型擁壁ユニットにおいて、前記基礎部は、前記底板の複数の前記水平面の間の段部に一部の前記土嚢の側面が対向するように階段状に構成されることを特徴とする。 According to the present invention, in the L-type retaining wall unit of the above means, the base portion is configured in a step shape so that a side surface of a part of the sandbag faces a step portion between the plurality of horizontal surfaces of the bottom plate. It is characterized by that.
　本発明はまた、上記手段のＬ型擁壁ユニットにおいて、前記土嚢は、直方体状の土嚢袋と、前記土嚢袋の内部に収容される矩形状のガイド枠と、隣接する前記ガイド枠同士を接続する接続部材と、を備え、前記基礎部は、隣接する前記土嚢同士が前記接続部材により互いに接続された状態で格子状に配列された複数の前記土嚢を、複数段積み重ねて構成されることを特徴とする。 According to the present invention, in the L-type retaining wall unit of the above means, the sandbag connects a rectangular parallelepiped bag, a rectangular guide frame accommodated in the sandbag bag, and the adjacent guide frames. A connecting member, and the base portion is configured by stacking a plurality of the sandbags arranged in a lattice in a state where adjacent sandbags are connected to each other by the connecting member. Features.
　本発明によれば、滑動および転倒に対する安定性を高めるという優れた効果を奏し得る。 According to the present invention, an excellent effect of increasing the stability against sliding and falling can be obtained.
（ａ）本発明の実施形態のＬ型擁壁の斜視図である。（ｂ）Ｌ型擁壁の側面図である。(A) It is a perspective view of the L-shaped retaining wall of embodiment of this invention. (B) It is a side view of an L-shaped retaining wall. 本発明の実施形態のＬ型擁壁ユニットを示した斜視図である。It is the perspective view which showed the L-shaped retaining wall unit of embodiment of this invention. 基礎部を構成する土嚢を示した図である。It is the figure which showed the sandbag which comprises a base part. Ｌ型擁壁ユニットを土留めとして設置した状態の一例を示した図である。It is the figure which showed an example of the state which installed the L-shaped retaining wall unit as a earth retaining. （ａ）および（ｂ）受圧壁をＬ型擁壁本体とは別部材から構成するようにした例を示した図である。(A) And (b) It is the figure which showed the example which comprised the pressure receiving wall from another member from the L-type retaining wall main body. （ａ）および（ｂ）Ｌ型擁壁の底板の下面を従来のＬ型擁壁と同様の形状に形成した例を示した図である。(A) And (b) It is the figure which showed the example which formed the lower surface of the baseplate of the L-shaped retaining wall in the shape similar to the conventional L-shaped retaining wall. 別部材を固定することによりＬ型擁壁の底板の下面を階段状に形成した例を示した図である。It is the figure which showed the example which formed the lower surface of the baseplate of the L-shaped retaining wall in step shape by fixing another member.
　以下、本発明の実施の形態を添付図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
　図１（ａ）は、本実施形態のＬ型擁壁１の斜視図であり、同図（ｂ）は、Ｌ型擁壁１の側面図である。Ｌ型擁壁１は、プレキャスト鉄筋コンクリート構造であり、これらの図に示されるように、垂直方向に延設された縦壁１１と、縦壁１１の下端部を基端として横方向に延設された底板１２と、底板１２の先端部から上方に向けて斜めに突設された受圧壁１３とから構成されている。 FIG. 1A is a perspective view of the L-shaped retaining wall 1 of the present embodiment, and FIG. 1B is a side view of the L-shaped retaining wall 1. The L-type retaining wall 1 has a precast reinforced concrete structure. As shown in these drawings, the L-type retaining wall 1 extends in the horizontal direction with the vertical wall 11 extending in the vertical direction and the lower end of the vertical wall 11 as the base end. The bottom plate 12 and a pressure receiving wall 13 that protrudes obliquely upward from the front end portion of the bottom plate 12.
　縦壁１１は、Ｌ型擁壁１が土留めとして使用される場合に、垂直方向に設置される部分である。本実施形態では、底板１２の反対側の面が外部に露出する正面１１ａであり、正面１１ａは滑らかな平面または適宜の装飾が施された面となっている。縦壁１１の背面１１ｂには、図示は省略するが、必要に応じて補強リブや隣接するＬ型擁壁１同士を連結するための連結部等が適宜に設けられる。また、縦壁１１には、正面１１ａおよび背面１１ｂの間を貫通する排水孔が、必要に応じて適宜の位置に設けられる。 The vertical wall 11 is a portion installed in the vertical direction when the L-shaped retaining wall 1 is used as a retaining wall. In the present embodiment, the surface on the opposite side of the bottom plate 12 is the front surface 11a exposed to the outside, and the front surface 11a is a smooth flat surface or a surface that is appropriately decorated. Although not shown in the drawings, the back surface 11b of the vertical wall 11 is appropriately provided with a reinforcing rib, a connecting portion for connecting adjacent L-shaped retaining walls 1 or the like as necessary. Moreover, the vertical wall 11 is provided with a drain hole penetrating between the front surface 11a and the back surface 11b at an appropriate position as necessary.
　底板１２は、縦壁１１の下端部の背面１１ｂ側から略水平方向に延設されている。底板１２の上面１２ａは、縦壁に対して角度θをなすように形成されている。この角度θは、特に限定されるものではなく、底板１２上に埋め戻す土粒子の内部摩擦角に応じて適宜に設定することができる。但し、一般的な土壌を使用し、底板１２の上面１２ａ上に設置（覆土）する場合を考慮すると、角度θは、９５乃至１１５度の範囲内に設定することが好ましく、１００乃至１１０度の範囲内に設定することがより好ましい。 The bottom plate 12 extends in a substantially horizontal direction from the back surface 11 b side of the lower end portion of the vertical wall 11. The upper surface 12a of the bottom plate 12 is formed so as to form an angle θ with respect to the vertical wall. The angle θ is not particularly limited, and can be set as appropriate according to the internal friction angle of the soil particles to be buried on the bottom plate 12. However, considering the case of using general soil and installing (covering soil) on the upper surface 12a of the bottom plate 12, the angle θ is preferably set within a range of 95 to 115 degrees, It is more preferable to set within the range.
　底板１２の下面１２ｂは、底板１２の基端側に設けられる第１水平面１２ｂ１と、底板１２の先端側に設けられる第２水平面１２ｂ２と、第１水平面１２ｂ１および第２水平面１２ｂ２の間の段部１２ｂ３とを有して構成されており、上面１２ｂに沿った階段状となっている。具体的には、第１水平面１２ｂ１および第２水平面１２ｂ２は、縦壁に対して略直交するように、すなわち設置時に略水平方向となるように形成され、第２水平面１２ｂ２は、第１水平面１２ｂ１よりも低い位置に設けられている。段部１２ｂ３は、本実施形態では縦壁１１と略平行、すなわち略垂直方向に形成しているが、これに限定されるものではなく、斜めに形成するようにしてもよい。 The bottom surface 12b of the bottom plate 12 includes a first horizontal plane 12b1 provided on the base end side of the bottom plate 12, a second horizontal plane 12b2 provided on the distal end side of the bottom plate 12, and a step between the first horizontal plane 12b1 and the second horizontal plane 12b2. 12b3, and has a stepped shape along the upper surface 12b. Specifically, the first horizontal plane 12b1 and the second horizontal plane 12b2 are formed so as to be substantially orthogonal to the vertical wall, that is, substantially horizontal when installed, and the second horizontal plane 12b2 is the first horizontal plane 12b1. It is provided at a lower position. In this embodiment, the step portion 12b3 is formed substantially parallel to the vertical wall 11, that is, in a substantially vertical direction. However, the step portion 12b3 is not limited to this and may be formed obliquely.
　底板１２の上面１２ａには、必要に応じて補強リブや連結部等が設けられる。また、底板１２には、Ｌ型擁壁１を基礎上に設置した後に、下面１２ｂ下側にモルタル等を注入するための孔を設けるようにしてもよい。 Reinforcing ribs and connecting portions are provided on the upper surface 12a of the bottom plate 12 as necessary. The bottom plate 12 may be provided with a hole for injecting mortar or the like below the lower surface 12b after the L-type retaining wall 1 is installed on the foundation.
　本実施形態では、底板１２の上面１２ａを傾斜させることにより、受圧壁１３に土圧の一部を受けさせるようにしている。また、設置時に略水平となる第１水平面１２ｂ１および第２水平面１２ｂ２を底板１２の下面１２ｂに設けることにより、基礎の構築を容易にすると共に、隣接して設置される複数のＬ型擁壁１の高さ合わせや面合わせを容易にし、据付工事の作業性を向上させている。また、段部１２ｂ３を設けることにより、滑動に対する抵抗力を土中の深い部分で発生させ、滑動に対する安定性を向上させている。 In the present embodiment, the pressure receiving wall 13 receives a part of the earth pressure by inclining the upper surface 12a of the bottom plate 12. In addition, by providing the first horizontal plane 12b1 and the second horizontal plane 12b2 that are substantially horizontal when installed on the lower surface 12b of the bottom plate 12, the construction of the foundation is facilitated, and a plurality of L-type retaining walls 1 that are installed adjacent to each other. This makes it easy to adjust the height and face of the machine and improve the workability of the installation work. Further, by providing the step portion 12b3, resistance to sliding is generated in a deep portion of the soil, and stability against sliding is improved.
　受圧壁１３は、詳細は後述するが、傾斜面である底板１２の上面１２ａ上を滑り落ちる土粒子を受け止めることにより、土粒子が拘束圧を受けて固化した状態となる固化領域を底板１２上に生成するためのものである。受圧壁１３は、底板１２の先端部から上方に向けて斜めに突設されている。そして、受圧壁１３において土圧を受ける面である受圧面１３ａは、受圧壁の基端から先端に向けて漸次前記縦壁１１から離隔するように傾斜した状態となっている。 Although details will be described later, the pressure receiving wall 13 has a solidified region on the bottom plate 12 where the soil particles are solidified by receiving the restraining pressure by receiving the soil particles sliding down on the upper surface 12a of the bottom plate 12 which is an inclined surface. It is for generating. The pressure receiving wall 13 protrudes obliquely upward from the front end portion of the bottom plate 12. And the pressure receiving surface 13a which is a surface which receives earth pressure in the pressure receiving wall 13 is in the state inclined so that it may gradually separate from the said vertical wall 11 toward the front-end | tip from the base end of a pressure receiving wall.
　本実施形態では、このように受圧面１３ａを傾斜させることにより、受圧壁１３に加わる土圧（拘束圧）が増大するようにしている。なお、受圧面１３ａの傾斜角度は特に限定されるものではなく、底板１２上に埋め戻す土粒子の内部摩擦角に応じて適宜に設定すればよい。また、受圧壁１３の形状や長さ、材質等は、特に限定されるものではなく、適宜に傾斜させた受圧面１３ａを構成することができる形状であればどのようなものであってもよい。 In the present embodiment, the earth pressure (restraint pressure) applied to the pressure receiving wall 13 is increased by inclining the pressure receiving surface 13a in this way. The inclination angle of the pressure receiving surface 13a is not particularly limited, and may be set as appropriate according to the internal friction angle of the soil particles to be backfilled on the bottom plate 12. In addition, the shape, length, material, and the like of the pressure receiving wall 13 are not particularly limited, and may be any shape as long as the pressure receiving surface 13a can be appropriately inclined. .
　図２は、Ｌ型擁壁ユニット２を示した斜視図である。同図に示されるように、Ｌ型擁壁ユニット２は、Ｌ型擁壁１と、地盤側に敷設されてＬ型擁壁１が上部に載置される基礎を構成する基礎部３とを有している。基礎部３は、複数の直方体状の土嚢３０を格子状に配列すると共に複数段積み重ねることで、Ｌ型擁壁１の底板１２の下面１２ｂに合わせた階段状に構成されている。 FIG. 2 is a perspective view showing the L-shaped retaining wall unit 2. As shown in the figure, the L-type retaining wall unit 2 includes an L-shaped retaining wall 1 and a base portion 3 that constitutes a foundation that is laid on the ground side and on which the L-shaped retaining wall 1 is placed. Have. The base portion 3 is configured in a stepped manner in accordance with the lower surface 12b of the bottom plate 12 of the L-type retaining wall 1 by arranging a plurality of rectangular parallelepiped sandbags 30 in a lattice shape and stacking a plurality of steps.
　図３は、基礎部３を構成する土嚢３０を示した図である。同図に示されるように、土嚢３０は、直方体状の土嚢袋３１と、土嚢袋３１の内部に収容される矩形状のガイド枠３２と、隣接するガイド枠３２同士を接続する接続部材３３とを備えている。 FIG. 3 is a view showing a sandbag 30 that constitutes the foundation 3. As shown in the figure, the sandbag 30 includes a rectangular parallelepiped sandbag 31, a rectangular guide frame 32 housed inside the sandbag 31, and a connecting member 33 that connects adjacent guide frames 32 to each other. It has.
　ガイド枠３２は、土嚢袋３１の底に置いて複数の土嚢を整列させるためのガイドの働きをするものであり、互いに結合されて矩形状の枠を構成する４つの板状リブ３２ａと、対向する板状リブ３２ａ同士を繋いでガイド枠３２の形状を維持する梁３２ｂとから構成されている。ガイド枠３２は、図示を省略した固定片を土嚢袋３１の外側から土嚢袋３１を貫通してガイド枠３２に結合させることにより土嚢袋３１に固定される。 The guide frame 32 functions as a guide for aligning a plurality of sandbags placed on the bottom of the sandbag bag 31, and is opposed to four plate-like ribs 32a that are combined with each other to form a rectangular frame. It is comprised from the beam 32b which connects the plate-shaped rib 32a to perform and maintains the shape of the guide frame 32. FIG. The guide frame 32 is fixed to the sandbag bag 31 by connecting a fixing piece (not shown) from the outside of the sandbag bag 31 to the guide frame 32 through the sandbag bag 31.
　接続部材３３は、両端に爪３３ａを備え、爪３３ａをガイド枠３２に係合させることで、隣接するガイド枠３２同士を接続する。これにより、格子状に配列された複数の土嚢３０は、隣接する土嚢３０同士が互いに接続された状態となる。接続部材３３は、このように隣接する土嚢３０同士を接続することにより、複数の土嚢３０を一体化して強度を向上させる。また、接続部材３３は、土嚢３０を配列する際に、各土嚢３０間に適切な隙間を確保するという機能を有している。 The connecting member 33 includes claws 33a at both ends, and the adjacent guide frames 32 are connected to each other by engaging the claws 33a with the guide frames 32. Thereby, the plurality of sandbags 30 arranged in a lattice form are in a state where adjacent sandbags 30 are connected to each other. The connection member 33 connects the sandbags 30 adjacent to each other as described above, thereby integrating the plurality of sandbags 30 and improving the strength. In addition, the connecting member 33 has a function of ensuring an appropriate gap between the sandbags 30 when the sandbags 30 are arranged.
　なお、本実施形態の土嚢３０は、本発明の発明者の一部による特許発明であり、その詳細については、特許第４０１９１００号公報を参照されたい。 Note that the sandbag 30 of the present embodiment is a patented invention by a part of the inventors of the present invention. For details, refer to Japanese Patent No. 4019100.
　図４は、Ｌ型擁壁ユニット２を土留めとして設置した状態の一例を示した図である。Ｌ型擁壁ユニット２を設置する場合、まず地盤４０上に複数の土嚢３０を配列して積み重ねることにより、基礎部３を構成する。このとき、同図に示すように土嚢３０を垂直方向に一列となるように積み重ねてもよいし、土嚢３０の位置をずらして千鳥状に積み重ねるようにしてもよい。土嚢３０を積み重ねる段数は、地盤４０の状態に応じて適宜に設定すればよい。また、地盤４０によっては、Ｌ型擁壁１の直下にのみ土嚢３０を配置するようにしてもよく、この場合は掘削量を削減すると共に作業工数を削減することができる。 FIG. 4 is a view showing an example of a state where the L-type retaining wall unit 2 is installed as a retaining wall. When installing the L-type retaining wall unit 2, the foundation portion 3 is configured by first arranging and stacking a plurality of sandbags 30 on the ground 40. At this time, as shown in the figure, the sandbags 30 may be stacked in a line in the vertical direction, or the positions of the sandbags 30 may be shifted and stacked in a staggered manner. The number of steps on which the sandbags 30 are stacked may be appropriately set according to the state of the ground 40. Further, depending on the ground 40, the sandbag 30 may be disposed only directly under the L-shaped retaining wall 1. In this case, the amount of excavation can be reduced and the number of work steps can be reduced.
　基礎部３の上部には、Ｌ型擁壁１の底板１２の下面１２ｂ（すなわち、第１水平面１２ｂ１、第２水平面１２ｂ２および段部１２ｂ３）の形状に合わせた段差３４を形成する。この段差３４は、同図に示すように１段の土嚢３０で形成してもよいし、Ｌ型擁壁１に対して土嚢３０のサイズが小さい場合には、複数段の土嚢３０で形成してもよい。 In the upper part of the base portion 3, a step 34 is formed in accordance with the shape of the lower surface 12b of the bottom plate 12 of the L-type retaining wall 1 (that is, the first horizontal surface 12b1, the second horizontal surface 12b2, and the step portion 12b3). This step 34 may be formed by a single-stage sandbag 30 as shown in the figure, or when the size of the sandbag 30 is smaller than the L-shaped retaining wall 1, it is formed by a plurality of stages of sandbag 30. May be.
　次に、基礎部３上部の段差３４の形状に合わせてＬ型擁壁１を基礎部３の上に載置する。具体的には、基礎部３の段差３４部分の土嚢３０の側面３０ａにＬ型擁壁１の底部１２の段部１２ｂ３を対向させた状態で、Ｌ型擁壁１を載置する。このとき、必要に応じてＬ型擁壁１の下面１２ｂと基礎部３の土嚢３０との間にモルタルや砂利等を充填する。また、隣接するＬ型擁壁１の間で高さ合わせや面合わせを行う場合は、第１水平面１２ｂ１または第２水平面１２ｂ２と基礎部３との間にスペーサ等を適宜挿入する。最後に、Ｌ型擁壁１の縦壁１１の背面１１ｂ側に背面土４１を覆土し、正面１１ａ側に正面土４２を覆土する。 Next, the L-shaped retaining wall 1 is placed on the foundation part 3 in accordance with the shape of the step 34 on the upper part of the foundation part 3. Specifically, the L-shaped retaining wall 1 is placed in a state where the step 12b3 of the bottom 12 of the L-shaped retaining wall 1 is opposed to the side surface 30a of the sandbag 30 in the step 34 portion of the base portion 3. At this time, mortar, gravel, or the like is filled between the lower surface 12b of the L-shaped retaining wall 1 and the sandbag 30 of the foundation 3 as necessary. In addition, when performing height alignment or surface alignment between adjacent L-shaped retaining walls 1, a spacer or the like is appropriately inserted between the first horizontal plane 12 b 1 or the second horizontal plane 12 b 2 and the base portion 3. Finally, the back soil 41 is covered on the back surface 11b side of the vertical wall 11 of the L-shaped retaining wall 1, and the front soil 42 is covered on the front surface 11a side.
　本実施形態のＬ型擁壁ユニット２では、複数の土嚢３０から基礎部３を構成しているため、地盤４０の状態によらず、容易に基礎部３を構築することが可能となっている。特に、本実施形態では、土嚢３０がガイド枠３２および接続部材３３を備えているため、地盤４０が軟弱であっても適切な間隔で土嚢３０を連結して迅速に配列することが可能であり、さらにこの結果、十分な強度を有する基礎部３を軟弱な地盤４０上に構築することができるようになっている。 In the L-type retaining wall unit 2 of the present embodiment, since the foundation part 3 is constituted by a plurality of sandbags 30, it is possible to easily construct the foundation part 3 regardless of the state of the ground 40. . In particular, in this embodiment, since the sandbag 30 includes the guide frame 32 and the connecting member 33, the sandbag 30 can be connected and arranged quickly at an appropriate interval even if the ground 40 is soft. As a result, the foundation 3 having sufficient strength can be constructed on the soft ground 40.
　また、本実施形態のＬ型擁壁１では、底板１２の下面１２ｂを階段状に構成しているため、従来の鈍角Ｌ型擁壁とは異なり、複数の土嚢３０から構成される基礎部３０上にも容易に設置可能となっている。また、縦壁１１の正面１１ａ下部が正面土４２から受ける力Ｆ１と共に、段部１２ｂ３が対向する土嚢３０の側面３０ａから受ける力Ｆ２を滑動に対する抵抗力として安定的に発揮させることができる。すなわち、正面土４２の表面から深い位置であり、且つ縦壁１１から背面１１ｂ側に離れた位置に段部１２ｂ３を設けることにより、雨水等により正面土４２の状態が変化したような場合であっても、少なくとも力Ｆ２を滑動に対する抵抗力として発揮させることができる。 Moreover, in the L-type retaining wall 1 of this embodiment, since the lower surface 12b of the baseplate 12 is comprised in step shape, the foundation part 30 comprised from several sandbags 30 unlike the conventional obtuse angle L-type retaining wall. It can be easily installed on top. Moreover, the force F2 received from the side surface 30a of the sandbag 30 with which the step part 12b3 opposes can be stably exhibited as the resistance force with respect to sliding with the force F1 which the front 11a lower part of the vertical wall 11 receives from the front soil 42. That is, it is a case where the state of the front soil 42 has changed due to rain water or the like by providing the step portion 12b3 at a position deep from the surface of the front soil 42 and away from the vertical wall 11 to the back surface 11b side. However, at least the force F2 can be exhibited as a resistance to sliding.
　さらに、本実施形態のＬ型擁壁１は、受圧壁１３を設けることにより、底板１２上の背面土４１の土圧の一部を受圧面１３ａで受け、Ｌ型擁壁１の安定性を高めるようにしている。具体的には、底板１２上の土粒子は、上面１２ａの傾斜に沿って同図の矢印Ａが示す方向に滑りを起こすが、受圧面１３ａによってこの滑りが制限され、土粒子は図に示す固化領域５０内に拘束されることとなる。ここで、固化領域５０の上面５１は、背面土４１の内部摩擦角に基づく角度で傾斜した傾斜面となる。そして、この固化領域５０内の土粒子は、上方の背面土４１および上載荷重による土圧が付加応力として作用することにより、粒子間摩擦が発生して固化する。 Furthermore, the L-type retaining wall 1 of the present embodiment is provided with the pressure-receiving wall 13 so that a part of the earth pressure of the back soil 41 on the bottom plate 12 is received by the pressure-receiving surface 13a, and the stability of the L-type retaining wall 1 is improved. I try to increase it. Specifically, the soil particles on the bottom plate 12 slide along the inclination of the upper surface 12a in the direction indicated by the arrow A in the figure, but this slip is limited by the pressure receiving surface 13a, and the soil particles are shown in the figure. It will be restrained in the solidified region 50. Here, the upper surface 51 of the solidified region 50 is an inclined surface inclined at an angle based on the internal friction angle of the back soil 41. The soil particles in the solidified region 50 are solidified due to the generation of interparticle friction by the upper back soil 41 and the earth pressure due to the overload acting as additional stress.
　すなわち、本実施形態のＬ型擁壁１によれば、土粒子が押し固められてＬ型擁壁１と半ば一体的に固化した固化領域５０が、底板１２上に生成される。従って、背面土４１は、領域５０の上面５１に沿って同図の矢印Ｂが示す方向に滑りを起こすこととなる。これにより、同図に示されるように、縦壁１１が背面土４１および上載荷重による土圧Ｐを受ける高さＨ１が、土留め高さＨ２よりも小さい範囲となるため、Ｌ型擁壁１の縦壁１１に加わる土圧が軽減されることとなる。 That is, according to the L-type retaining wall 1 of the present embodiment, the solidified region 50 that is solidified integrally with the L-type retaining wall 1 by the earth particles being compacted is generated on the bottom plate 12. Accordingly, the back soil 41 slides in the direction indicated by the arrow B in FIG. As a result, as shown in the figure, the height H1 at which the vertical wall 11 receives the back soil 41 and the earth pressure P due to the overload is in a range smaller than the retaining height H2, so that the L-shaped retaining wall 1 The earth pressure applied to the vertical wall 11 will be reduced.
　また、固化領域５０の上面５１は、縦壁１１に対して鈍角をなすように傾斜しているため、従来の鈍角Ｌ型擁壁と同様に、底板反力Ｆ３の水平方向分力Ｆ４を滑動に対する抵抗力として利用することが可能となっている。 Further, since the upper surface 51 of the solidified region 50 is inclined so as to form an obtuse angle with respect to the vertical wall 11, the horizontal component F4 of the bottom plate reaction force F3 is slid similarly to the conventional obtuse angle L-type retaining wall. It can be used as a resistance force against.
　このように、本実施形態では、受圧壁１３を設けることによって底板１２上に固化領域５０を生成し、Ｌ型擁壁１の滑動および転倒に対する安定性をさらに高めるようにしている。また、例えば地震等により過大な荷重がＬ型擁壁１に加わったような場合にも、この荷重を固化領域５０によって適度に分散し、且つ縦壁１１が受ける土圧Ｐを軽減することができるため、従来の鈍角Ｌ型擁壁以上の安定性を備えることが可能となっている。 As described above, in the present embodiment, the solidification region 50 is generated on the bottom plate 12 by providing the pressure receiving wall 13, and the stability of the L-type retaining wall 1 against sliding and falling is further enhanced. Further, even when an excessive load is applied to the L-type retaining wall 1 due to an earthquake or the like, for example, this load can be appropriately dispersed by the solidified region 50 and the earth pressure P received by the vertical wall 11 can be reduced. Therefore, it is possible to provide stability that is higher than that of the conventional obtuse angle L-type retaining wall.
　なお、本実施形態では、受圧壁１３を底板１２と一体的に構成している、すなわち底板１２に受圧壁１３を備える形状にＬ型擁壁１はプレキャストされるが、受圧壁１３をＬ型擁壁１本体とは別部材から構成するようにしてもよい。 In the present embodiment, the pressure receiving wall 13 is formed integrally with the bottom plate 12, that is, the L-type retaining wall 1 is precast into a shape having the pressure receiving wall 13 on the bottom plate 12, but the pressure receiving wall 13 is L-shaped. You may make it comprise from a member different from the retaining wall 1 main body.
　図５（ａ）および（ｂ）は、受圧壁１３をＬ型擁壁１本体とは別部材から構成するようにした例を示した図である。この例では、同図（ａ）に示されるように、受圧壁１３は、底板１２の先端部に揺動ピン１３ｂを介して揺動自在に取付けられる。そして、同図（ｂ）または（ｃ）に示されるように、Ｌ型擁壁１を設置する際には、受圧壁１３は、ボルトや係合、接着等の既知の手法により所定の角度で固定される。 5 (a) and 5 (b) are views showing an example in which the pressure receiving wall 13 is formed of a member different from the L-type retaining wall 1 main body. In this example, the pressure receiving wall 13 is swingably attached to the distal end portion of the bottom plate 12 via a swing pin 13b as shown in FIG. And when the L-type retaining wall 1 is installed as shown in FIG. 5B or FIG. 5C, the pressure receiving wall 13 is fixed at a predetermined angle by a known method such as bolt, engagement, adhesion, or the like. Fixed.
　このように、受圧壁１３をＬ型擁壁１本体とは別部材から構成し、揺動自在に取付けることにより、Ｌ型擁壁１の保管時や運搬時等において複数のＬ型擁壁１を受圧壁１３に影響されることなくコンパクトに積層することができる。また、受圧面１３ａの傾斜角度を適宜に設定することが可能になると共に、受圧壁１３の形状や長さを容易に変更することが可能となる。なお、この場合の受圧壁１３は、Ｌ型擁壁１本体と同様に鉄筋コンクリートから構成してもよいし、鉄等の金属や、その他の材料から構成するようにしてもよい。また、別部材の受圧壁１３を揺動自在に固定するのではなく、ボルトや係合等により受圧壁１３をＬ型擁壁１本体に着脱可能に固定するようにしてもよい。 As described above, the pressure receiving wall 13 is formed of a member different from the main body of the L-shaped retaining wall 1 and is swingably mounted, whereby a plurality of L-shaped retaining walls 1 are stored or stored during transportation of the L-shaped retaining wall 1. Can be stacked in a compact manner without being affected by the pressure receiving wall 13. In addition, the inclination angle of the pressure receiving surface 13a can be set as appropriate, and the shape and length of the pressure receiving wall 13 can be easily changed. In addition, the pressure receiving wall 13 in this case may be comprised from reinforced concrete like the L-type retaining wall 1 main body, and may be comprised from metals, such as iron, and another material. Further, the pressure receiving wall 13 as another member may be fixed to the main body of the L-type retaining wall 1 so as to be detachable by bolts, engagement, or the like, instead of being fixed so as to be swingable.
　また、本実施形態では、Ｌ型擁壁１の底板１２の下面１２ｂを階段状に形成した例を示したが、本発明はこれに限定されるものではなく、下面１２ｂを従来のＬ型擁壁と同様の形状に構成するようにしてもよい。 In the present embodiment, the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in a stepped shape. However, the present invention is not limited to this, and the lower surface 12b is formed with a conventional L-shaped retaining wall. You may make it comprise in the shape similar to a wall.
　図６（ａ）および（ｂ）は、Ｌ型擁壁１の底板１２の下面１２ｂを従来のＬ型擁壁と同様の形状に形成した例を示した図であり、同図（ａ）は下面１２ｂを縦壁１１と直交するように形成した例、同図（ｂ）は下面１２ｂを縦壁１１と鈍角をなすように形成した例を示している。同図（ａ）および（ｂ）に示されるように下面１２ｂを形成することにより、従来以上の安定性を備えるＬ型擁壁１を従来通りの施行方法で設置することができる。 6 (a) and 6 (b) are diagrams showing an example in which the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in the same shape as a conventional L-shaped retaining wall. An example in which the lower surface 12 b is formed so as to be orthogonal to the vertical wall 11, and FIG. 8B shows an example in which the lower surface 12 b is formed to form an obtuse angle with the vertical wall 11. By forming the lower surface 12b as shown in FIGS. 5A and 5B, the L-type retaining wall 1 having stability higher than that of the conventional can be installed by a conventional enforcement method.
　なお、既存の鈍角Ｌ型擁壁の底板の先端部に別部材の受圧壁１３をボルト等により固定することで、Ｌ型擁壁１を構成するようにしてもよい。また、既存の直角Ｌ型擁壁の底板上面に傾斜面を追加した上で先端部に別部材の受圧壁１３を固定することにより、Ｌ型擁壁１を構成するようにしてもよい。 Note that the L-type retaining wall 1 may be configured by fixing the pressure receiving wall 13 as a separate member to the tip of the bottom plate of the existing obtuse L-shaped retaining wall with a bolt or the like. Further, the L-type retaining wall 1 may be configured by adding an inclined surface to the upper surface of the bottom plate of the existing right-angle L-shaped retaining wall and fixing the pressure receiving wall 13 as another member to the tip portion.
　図７は、別部材を固定することによりＬ型擁壁１の底板１２の下面１２ｂを階段状に形成した例を示した図である。この例では、Ｌ型擁壁１は、同図に示されるように、縦壁１１に対して鈍角をなすように傾斜して形成された底板１２下側の取付面１２ｃに略楔形状の固定部材１４を固定することによって、底板１２の下面１２ｂが階段状に形成される。この場合、取付面１２ｃに対する固定部材１４の固定方法は、ボルトや係合、接着等の既知の固定方法を採用することができる。なお、さらに受圧壁１３を別部材の固定により形成するようにしてもよいことはいうまでもない。 FIG. 7 is a view showing an example in which the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1 is formed in a step shape by fixing another member. In this example, as shown in the figure, the L-shaped retaining wall 1 is fixed in a substantially wedge shape to a mounting surface 12c on the lower side of the bottom plate 12 that is formed so as to form an obtuse angle with respect to the vertical wall 11. By fixing the member 14, the lower surface 12b of the bottom plate 12 is formed in a step shape. In this case, as a method for fixing the fixing member 14 to the mounting surface 12c, a known fixing method such as a bolt, engagement, or adhesion can be employed. Needless to say, the pressure receiving wall 13 may be formed by fixing another member.
　このようにすることで、Ｌ型擁壁１の製造や運搬を容易にすることができる場合がある。また、例えば既存の鈍角Ｌ型擁壁を活用して、本発明のＬ型擁壁１を構成することができる。なお、この場合の取付面１２ｃは、全ての面が縦壁１１に対して鈍角をなすように傾斜した面である必要はなく、同図に示されるように、例えば縦壁１１と直交する面等の異なる角度の面が含まれていてもよい。また、取付面１２ｃに固定部材１４を固定するための突起等が設けられていてもよい。 In this way, the L-type retaining wall 1 may be easily manufactured and transported. For example, the L-type retaining wall 1 of the present invention can be configured by utilizing an existing obtuse L-shaped retaining wall. Note that the mounting surface 12c in this case does not have to be an inclined surface so that all surfaces form an obtuse angle with respect to the vertical wall 11, and as shown in the figure, for example, a surface orthogonal to the vertical wall 11 Etc., surfaces with different angles may be included. Further, a protrusion or the like for fixing the fixing member 14 to the attachment surface 12c may be provided.
　以上説明したように、本実施形態に係るＬ型擁壁１は、垂直方向に設置される縦壁１１と、縦壁１１の下端部を基端として横方向に延設される底板１２と、からなるＬ型擁壁であって、底板１２の上面１２ａは、縦壁１１に対して鈍角をなすように傾斜して形成され、底板１２の先端部には、底板１２上の土圧の一部を受ける受圧壁１３が上方に向けて突設されている。 As described above, the L-type retaining wall 1 according to the present embodiment includes the vertical wall 11 installed in the vertical direction, the bottom plate 12 extending in the horizontal direction with the lower end portion of the vertical wall 11 as the base end, An upper surface 12 a of the bottom plate 12 is formed so as to be inclined with an obtuse angle with respect to the vertical wall 11, and an earth pressure on the bottom plate 12 is set at the tip of the bottom plate 12. A pressure receiving wall 13 that receives the portion protrudes upward.
　このような構成とすることで、縦壁１１に加わる土圧Ｐを軽減することが可能となり、滑動および転倒に対する安定性を従来以上に高めることができる。特に、地震等により過大な荷重がＬ型擁壁１に加わったような場合にも、この荷重を適度に分散すると共に、縦壁１１が受ける土圧Ｐを軽減することができるため、従来の鈍角Ｌ型擁壁以上の安定性を備えることが可能となる。 Such a configuration makes it possible to reduce the earth pressure P applied to the vertical wall 11, and to improve the stability against sliding and falling more than before. In particular, even when an excessive load is applied to the L-type retaining wall 1 due to an earthquake or the like, the load can be appropriately dispersed and the earth pressure P received by the vertical wall 11 can be reduced. It becomes possible to provide stability more than an obtuse L-shaped retaining wall.
　なお、受圧壁１３（受圧面１３ａ）の高さおよび幅は、埋め戻される背面土４１の性質や要求される安定性の程度等に応じて適宜の寸法に設定することができる。 The height and width of the pressure receiving wall 13 (pressure receiving surface 13a) can be set to appropriate dimensions according to the nature of the back soil 41 to be backfilled and the required degree of stability.
　また、受圧壁１３の受圧面１３ａは、受圧壁１３の基端から先端に向けて漸次縦壁１１から離隔するように傾斜している。このようにすることで、受圧壁１３に加わる土圧（拘束圧）を増大させ、硬化領域５０における土粒子の拘束効果を増大させることができる。なお、受圧面１３ａの傾斜角度は、底板１２上に設置する地盤の土粒子に合わせ、拘束効果が最大となるように適宜の角度に設定することができる。すなわち、受圧面１３ａは、土粒子の性質によっては、例えば受圧壁１３の基端から先端に向けて漸次縦壁１１に近接するように傾斜していてもよいし、縦壁１１と平行であってもよい。 Further, the pressure receiving surface 13a of the pressure receiving wall 13 is inclined so as to be gradually separated from the vertical wall 11 from the base end to the tip end of the pressure receiving wall 13. By doing in this way, the earth pressure (restraint pressure) added to the receiving wall 13 can be increased, and the restraint effect of the soil particle in the hardening area | region 50 can be increased. The inclination angle of the pressure receiving surface 13a can be set to an appropriate angle so as to maximize the restraining effect in accordance with the soil particles of the ground installed on the bottom plate 12. That is, the pressure receiving surface 13a may be inclined so as to gradually approach the vertical wall 11 from the proximal end to the distal end of the pressure receiving wall 13 depending on the properties of the soil particles, or is parallel to the vertical wall 11, for example. May be.
　また、底板１２の上面１２ａは、縦壁１１に対して９５乃至１１５度の角度をなすように形成されているため、安定性の向上に寄与する固化領域５０を底板１２上に確実に生成することができる。 Further, since the upper surface 12a of the bottom plate 12 is formed so as to form an angle of 95 to 115 degrees with respect to the vertical wall 11, the solidified region 50 that contributes to the improvement of stability is reliably generated on the bottom plate 12. be able to.
　また、受圧壁１３は、底板１２と一体的に形成されているため、受圧壁１３に十分な強度を持たせながらも軽量に構成することができる。 Further, since the pressure receiving wall 13 is formed integrally with the bottom plate 12, the pressure receiving wall 13 can be configured to be lightweight while having sufficient strength.
　また、受圧壁１３は、揺動自在且つ所定の角度で固定可能に底板１２に取付けられた別部材から構成されるようにしてもよい。この場合、複数のＬ型擁壁１をコンパクトに積層した状態で保管や運搬をすることができる。また、受圧面１３ａの傾斜角度を、底板１２上に設置する地盤の土粒子に合わせた適宜の角度に設定することができると共に、受圧壁１３の形状や長さを容易に変更することができる。 Further, the pressure receiving wall 13 may be constituted by another member attached to the bottom plate 12 so as to be swingable and fixed at a predetermined angle. In this case, the plurality of L-shaped retaining walls 1 can be stored and transported in a compactly stacked state. In addition, the inclination angle of the pressure receiving surface 13a can be set to an appropriate angle according to the soil particles of the ground installed on the bottom plate 12, and the shape and length of the pressure receiving wall 13 can be easily changed. .
　また、底板１２の下面１２ｂは、複数の水平面１２ｂ１、１２ｂ２を底板１２の上面１２ａに沿って高さを変えて配置した階段状に形成されている。このため、従来のＬ型擁壁以上の安定性を備えながらも、施工時の作業性を向上させることができる。また、水平面１２ｂ１、１２ｂ２を有することで、土嚢上にも問題なく設置することができるため、軟弱地盤を補強するための工法として近年注目されている土嚢工法と組み合わせることで、軟弱地盤上であっても容易にＬ型擁壁１を設置することができる。 Further, the lower surface 12b of the bottom plate 12 is formed in a staircase shape in which a plurality of horizontal surfaces 12b1 and 12b2 are arranged at different heights along the upper surface 12a of the bottom plate 12. For this reason, the workability | operativity at the time of construction can be improved, providing stability more than the conventional L type retaining wall. Moreover, since it can be installed on the sandbag without any problems by having the horizontal planes 12b1 and 12b2, it can be placed on the soft ground by combining with the sandbag construction method which has recently been attracting attention as a construction method for reinforcing the soft ground. However, the L-type retaining wall 1 can be easily installed.
　なお、本実施形態では、底板１２の下面１２ｂを、第１水平面１２ｂ１、第２水平面１２ｂ２および段部１２ｂ３を備える２段の階段状に形成した例を示したが、本発明はこれに限定されるものではなく、下面１２ｂを３段以上の階段状に構成するようにしてもよい。また、本実施形態では、土嚢３０上にＬ型擁壁１を設置する例を示したが、本発明はこれに限定されるものではなく、コンクリートの打設等による一般的な基礎上にＬ型擁壁１を設置するようにしてもよい。 In the present embodiment, the lower surface 12b of the bottom plate 12 is formed in a two-step shape including the first horizontal surface 12b1, the second horizontal surface 12b2, and the step portion 12b3. However, the present invention is not limited to this. Instead of this, the lower surface 12b may be configured in three or more steps. Moreover, in this embodiment, although the example which installs the L-shaped retaining wall 1 on the sandbag 30 was shown, this invention is not limited to this, L on the general foundation by concrete placement etc. The mold retaining wall 1 may be installed.
　また、底板１２の下面１２ｂは、底板１２の基端側に設けられる第１水平面１２ｂ１と、底板１２の先端側において第１水平面１２ｂ１よりも低い位置に設けられる第２水平面１２ｂ２と、を有して構成されている。すなわち、本発明では、比較的簡易な構成で上述の効果を発揮することが可能であり、Ｌ型擁壁１の製造コストを低減させることができる。 The bottom surface 12b of the bottom plate 12 has a first horizontal plane 12b1 provided on the base end side of the bottom plate 12, and a second horizontal plane 12b2 provided at a position lower than the first horizontal plane 12b1 on the distal end side of the bottom plate 12. Configured. That is, in the present invention, the above-described effects can be exhibited with a relatively simple configuration, and the manufacturing cost of the L-shaped retaining wall 1 can be reduced.
　また、底板１２の下面１２ｂは、縦壁１１に対して鈍角をなすように傾斜して形成された取付面１２ｃに略楔形状の固定部材１４を固定することにより、階段状に形成されるようにしてもよい。この場合、Ｌ型擁壁１の製造や運搬を容易にすることができる場合がある。 Further, the lower surface 12b of the bottom plate 12 is formed in a step shape by fixing a substantially wedge-shaped fixing member 14 to a mounting surface 12c formed to be inclined with an obtuse angle with respect to the vertical wall 11. It may be. In this case, the L-type retaining wall 1 may be easily manufactured and transported.
　また、本実施形態に係るＬ型擁壁ユニット２は、Ｌ型擁壁１と、Ｌ型擁壁１が有する底板１２の下面１２ｂの形状に合わせて地盤４０側に敷設される複数の土嚢３０からなる基礎部３と、を有している。このような構成とすることで、地盤４０の状態によらず、容易に基礎部３を構築してＬ型擁壁１を設置することができる。すなわち、従来の工法と比較してはるかに迅速且つ低コストで軟弱地盤上に土留めの擁壁を設置することができる。 In addition, the L-type retaining wall unit 2 according to this embodiment includes a plurality of sandbags 30 laid on the ground 40 side in accordance with the shape of the L-shaped retaining wall 1 and the lower surface 12b of the bottom plate 12 of the L-shaped retaining wall 1. And a basic part 3 made of By setting it as such a structure, irrespective of the state of the ground 40, the base part 3 can be constructed | assembled easily and the L-shaped retaining wall 1 can be installed. That is, the retaining wall of the earth retaining can be installed on the soft ground much faster and at a lower cost than the conventional construction method.
　また、基礎部３は、底板１２の複数の水平面１２ｂ１、１２ｂ２の間の段部１２ｂ３に一部の土嚢３０の側面３０ａが対向するように階段状に構成されている。このため、正面土４２の状態によらず、段部１２ｂ３と土嚢３０の側面３０ａとにより滑動に対する抵抗力を安定的に発揮させ、Ｌ型擁壁１の安定性をさらに高めることができる。 Moreover, the base part 3 is comprised in step shape so that the side surface 30a of some sandbags 30 may oppose the step part 12b3 between the some horizontal surfaces 12b1 and 12b2 of the baseplate 12. FIG. For this reason, regardless of the state of the front soil 42, the step 12 b 3 and the side surface 30 a of the sandbag 30 can stably exert a resistance to sliding, and the stability of the L-type retaining wall 1 can be further enhanced.
　また、土嚢３０は、直方体状の土嚢袋３１と、土嚢袋３１の内部に収容される矩形状のガイド枠３２と、隣接するガイド枠３２同士を接続する接続部材３３と、を備え、基礎部３は、隣接する土嚢３０同士が接続部材３３により互いに接続された状態で格子状に配列された複数の土嚢３０を、複数段積み重ねて構成されている。 The sandbag 30 includes a rectangular parallelepiped sandbag 31, a rectangular guide frame 32 housed in the sandbag 31, and a connecting member 33 that connects adjacent guide frames 32 to each other, and a base portion 3 is configured by stacking a plurality of sandbags 30 arranged in a lattice in a state where adjacent sandbags 30 are connected to each other by a connecting member 33.
　このような構成とすることで、地盤４０の状態によらず、土嚢３０の敷設をきわめて容易にすることができる。また、土嚢３０を適切な間隔で配置すると共に各土嚢３０を連結することができるため、基礎部３に十分な強度を持たせ、地盤４０を確実に補強することができる。 With such a configuration, the sandbag 30 can be laid very easily regardless of the state of the ground 40. Moreover, since the sandbag 30 can be arrange | positioned at an appropriate space | interval and each sandbag 30 can be connected, the base part 3 can be given sufficient intensity | strength, and the ground 40 can be reinforced reliably.
　以上、本発明の実施の形態について説明したが、本発明のＬ型擁壁およびＬ型擁壁ユニットは、上記した実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。 Although the embodiments of the present invention have been described above, the L-type retaining wall and the L-shaped retaining wall unit of the present invention are not limited to the above-described embodiments, and do not depart from the spirit of the present invention. Of course, various changes can be made.
　本発明のＬ型擁壁およびＬ型擁壁ユニットは、土地の造成以外にも各種土木工事の分野で利用することができる。 The L-type retaining wall and the L-type retaining wall unit of the present invention can be used in various civil engineering fields in addition to land creation.
　１　Ｌ型擁壁
　２　Ｌ型擁壁ユニット
　３　基礎部
　１１　縦壁
　１２　底板
　１２ａ　底板の上面
　１２ｂ　底板の下面
　１２ｂ１　第１水平面
　１２ｂ２　第２水平面
　１２ｂ３　段部
　１２ｃ　取付面
　１３　受圧壁
　１３ａ　受圧面
　１４　固定部材
　３０　土嚢
　３０ａ　土嚢の側面
　３１　土嚢袋
　３２　ガイド枠
　３３　接続部材
　４０　地盤 DESCRIPTION OF SYMBOLS 1 L-type retaining wall 2 L-type retaining wall unit 3 Base part 11 Vertical wall 12 Bottom plate 12a Bottom plate top surface 12b Bottom plate bottom surface 12b1 First horizontal surface 12b2 Second horizontal surface 12b3 Stepped portion 12c Mounting surface 13 Pressure receiving wall 13a Pressure receiving surface 14 Fixing member 30 sandbag 30a sandbag 31 sandbag 32 guide frame 33 connecting member 40 ground

Claims (11)

  1. 　垂直方向に設置される縦壁と、
    　前記縦壁の下端部を基端として横方向に延設される底板と、からなるＬ型擁壁であって、
    　前記底板の上面は、前記縦壁に対して鈍角をなすように傾斜して形成され、
    　前記底板の先端部には、前記底板上の土圧の一部を受ける受圧壁が上方に向けて突設されることを特徴とする、
    　Ｌ型擁壁。     A vertical wall installed vertically;
    An L-shaped retaining wall comprising a bottom plate extending in the lateral direction with the lower end of the vertical wall as a base end,
    The upper surface of the bottom plate is formed to be inclined to form an obtuse angle with respect to the vertical wall,
    A pressure receiving wall that receives a part of earth pressure on the bottom plate protrudes upward at the tip of the bottom plate,
    L-type retaining wall.
  2. 　前記受圧壁の受圧面は、前記受圧壁の基端から先端に向けて漸次前記縦壁から離隔するように傾斜していることを特徴とする、
    　請求項１に記載のＬ型擁壁。     The pressure receiving surface of the pressure receiving wall is inclined so as to be gradually separated from the vertical wall from the base end to the tip end of the pressure receiving wall,
    The L-shaped retaining wall according to claim 1.
  3. 　前記底板の上面は、前記縦壁に対して９５乃至１１５度の角度をなすように形成されることを特徴とする、
    　請求項１または２に記載のＬ型擁壁。     An upper surface of the bottom plate is formed to form an angle of 95 to 115 degrees with respect to the vertical wall.
    The L-shaped retaining wall according to claim 1 or 2.
  4. 　前記受圧壁は、前記底板と一体的に形成されることを特徴とする、
    　請求項１乃至３のいずれかに記載のＬ型擁壁。     The pressure receiving wall is formed integrally with the bottom plate,
    The L-shaped retaining wall according to any one of claims 1 to 3.
  5. 　前記受圧壁は、揺動自在且つ所定の角度で固定可能に前記底板に取付けられた別部材から構成されることを特徴とする、
    　請求項１乃至３のいずれかに記載のＬ型擁壁。     The pressure receiving wall is constituted by another member attached to the bottom plate so as to be swingable and fixable at a predetermined angle.
    The L-shaped retaining wall according to any one of claims 1 to 3.
  6. 　前記底板の下面は、複数の水平面を前記底板の上面に沿って高さを変えて配置した階段状に形成されることを特徴とする、
    　請求項１乃至５のいずれかに記載のＬ型擁壁。     The bottom surface of the bottom plate is formed in a staircase shape in which a plurality of horizontal planes are arranged at different heights along the top surface of the bottom plate.
    The L-shaped retaining wall according to any one of claims 1 to 5.
  7. 　前記底板の下面は、前記底板の前記基端側に設けられる第１水平面と、前記底板の先端側において前記第１水平面よりも低い位置に設けられる第２水平面と、を有して構成されることを特徴とする、
    　請求項６に記載のＬ型擁壁。     The bottom surface of the bottom plate includes a first horizontal plane provided on the base end side of the bottom plate and a second horizontal plane provided at a position lower than the first horizontal plane on the distal end side of the bottom plate. It is characterized by
    The L-type retaining wall according to claim 6.
  8. 　前記底板の下面は、前記縦壁に対して鈍角をなすように傾斜して形成された取付面に略楔形状の固定部材を固定することにより、階段状に形成されることを特徴とする、
    　請求項６または７に記載のＬ型擁壁。     The bottom surface of the bottom plate is formed in a staircase shape by fixing a substantially wedge-shaped fixing member to a mounting surface that is inclined to form an obtuse angle with respect to the vertical wall.
    The L-shaped retaining wall according to claim 6 or 7.
  9. 　請求項１乃至８のいずれかに記載のＬ型擁壁と、
    　前記Ｌ型擁壁が有する前記底板の下面形状に合わせて地盤側に敷設される複数の土嚢からなる基礎部と、を有することを特徴とする、
    　Ｌ型擁壁ユニット。     L-shaped retaining wall according to any one of claims 1 to 8,
    A base portion made of a plurality of sandbags laid on the ground side in accordance with the lower surface shape of the bottom plate of the L-shaped retaining wall,
    L-type retaining wall unit.
  10. 　前記基礎部は、前記底板の複数の前記水平面の間の段部に一部の前記土嚢の側面が対向するように階段状に構成されることを特徴とする、
    　請求項９に記載のＬ型擁壁ユニット。     The base portion is configured in a step shape such that a side surface of a part of the sandbag is opposed to a step portion between the plurality of horizontal surfaces of the bottom plate.
    The L-type retaining wall unit according to claim 9.
  11. 　前記土嚢は、直方体状の土嚢袋と、前記土嚢袋の内部に収容される矩形状のガイド枠と、隣接する前記ガイド枠同士を接続する接続部材と、を備え、
    　前記基礎部は、隣接する前記土嚢同士が前記接続部材により互いに接続された状態で格子状に配列された複数の前記土嚢を、複数段積み重ねて構成されることを特徴とする、
    　請求項９または１０に記載のＬ型擁壁ユニット。     The sandbag comprises a rectangular parallelepiped sandbag, a rectangular guide frame housed inside the sandbag, and a connecting member connecting adjacent guide frames.
    The base portion is configured by stacking a plurality of the sandbags arranged in a lattice shape in a state where adjacent sandbags are connected to each other by the connection member,
    The L-type retaining wall unit according to claim 9 or 10.
PCT/JP2011/053558 2010-02-22 2011-02-18 L-shaped retaining wall and l-shaped retaining wall unit WO2011102482A1 (en)

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WO2022246941A1 (en) * 2021-05-26 2022-12-01 上海斋喜工程技术有限公司 Civil engineering shielding engineering wall member

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KR102434362B1 (en) * 2020-07-08 2022-08-19 (주)동명기술공단종합건축사사무소 Precast prefabricated retaining wall structure and construction method Thereof

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JPH01102234U (en) * 1987-12-24 1989-07-10
JPH0215640U (en) * 1988-07-11 1990-01-31
JP2000080637A (en) * 1998-06-24 2000-03-21 Kuraray Co Ltd Ground reinforcing structure and ground reinforcing construction

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JPH01102234U (en) * 1987-12-24 1989-07-10
JPH0215640U (en) * 1988-07-11 1990-01-31
JP2000080637A (en) * 1998-06-24 2000-03-21 Kuraray Co Ltd Ground reinforcing structure and ground reinforcing construction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022246941A1 (en) * 2021-05-26 2022-12-01 上海斋喜工程技术有限公司 Civil engineering shielding engineering wall member

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