JPH023857B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention is applied to construction of residential land, roads, and other civil engineering works such as earth retaining, or construction and civil engineering work such as housing land, earth retaining, etc., which is equipped with earth retaining plates that support soil to prevent the collapse of earth and sand. Regarding retaining walls.

<Prior art> A buttress-type retaining wall is one type of retaining wall classified based on the "Guidelines for Road Earthwork Retaining Walls, Culverts, and Temporary Structures" (Japan Road Association). This buttress-type retaining wall consists of a vertical wall, a bottom plate integrally molded so as to be orthogonal to each other at the bottom of the vertical wall, and approximately triangular buttresses fixed to the back of the vertical wall and the top surface of the bottom plate, respectively. This refers to a retaining wall in which the rigidity between the vertical wall and the bottom slab is maintained by a buttress, and the buttress is on the side where earth pressure acts.

When constructing the above-mentioned retaining wall, if the foundation ground is bedrock, cut into the bedrock to the bottom of the retaining wall bottom slab, completely remove any loose rocks etc. caused by rock excavation, and cut into the rock surface. Thoroughly clean it and then construct the bottom slab directly on top of it, or construct the bottom slab on top of leveled concrete or mortar.
If the foundation ground is a layer of soil, spread stones, crushed stones, etc. on the bottom of the excavation, thoroughly compact them, then pour leveled concrete as necessary, and construct the bottom slab on top of it. When the foundation ground is sloped, etc.
Moreover, if a part of the lower surface of the bottom slab is soft, that part will be excavated and replaced with concrete. In this case, the bottom of the replaced part will be excavated horizontally, and if the height increases, steps of at least 50 cm will be installed to create a staircase. shall be as follows. When building a foundation directly on soft ground, if the layer is relatively shallow, the soft ground may be excavated and replaced with high-quality material to serve as the foundation ground.

<Problems to be solved by the invention> As described above, when constructing a conventional retaining wall, the entire ground must be leveled so that the flat base of the retaining wall can be stably installed on the foundation ground. Therefore, it not only takes time to construct the foundation ground, but also poses problems such as lack of stability of the bottom slab if the foundation ground cannot be finished flat. In addition, this type of retaining wall has little contact resistance between the bottom slab and the ground, and the retaining wall slides due to the horizontal component of the resultant soil pressure, which not only lacks stability against sliding but also impairs stability during earthquakes. It had become commonplace.

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and its purpose is to enable construction of a retaining wall without requiring a bottom slab, to facilitate construction of the foundation ground, and to provide a retaining wall. To generally provide a retaining wall with retaining plates that is integrated with the ground and has high stability against sliding, and also has high stability during earthquakes.

<Means for Solving the Problems> As a means for solving the above problems, the present invention provides an extension portion 1a extending below the plane 2b of the buttress wall 2 at the lower part of the vertical wall 1. At the same time, holes 3 for fastening bolts and nuts are provided in the lower tip 2a of the buttress 2, and a retaining plate 4 is installed behind the vertical wall 1 in parallel with the vertical wall, and a retaining plate is installed on the upper part of the retaining plate. A groove 5 into which the lower tip 2a of the wall 2 is fitted is formed, a pair of retaining members 6 are formed in the retaining plate 4 facing laterally across the groove 5, and bolts and nuts are attached to the retaining members 6. This is a retaining wall with earth retaining plates characterized by providing fastening holes 7. The retaining wall with retaining plates according to the present invention is entirely made of reinforced concrete or other strong material. On the back side of the vertical wall 1, there is a buttress 2 that is perpendicular to the vertical wall.
is formed, and the shape of the buttress 2 is not limited as long as it protects the vertical wall 1, but usually a substantially L-shaped side surface or a substantially triangular shape is used. The lower part of the vertical wall 1 is provided with an extension part 1a that extends below the bottom surface 2b of the buttress wall 2, and the extension part 1a is buried in the foundation ground G when constructing the retaining wall and is connected to the ground. By being integrated, the structure resists the horizontal component of the resultant earth pressure to prevent sliding and has an earthquake-resistant structure. Further, the vertical wall 1 is provided with a drainage hole 8 for draining water that permeates and concentrates on the back surface of the retaining wall. Reinforcement holes 9 are provided in the lower part of the buttress wall 2, closer to the base and closer to the lower tip 2a. The size and thickness of the retaining board 4, which is installed behind the vertical wall 1 and parallel to the vertical wall (orthogonal to the buttress 2), is determined by earth pressure calculation, and the area below the groove 5 of the retaining board is the foundation. It will be buried in ground G. A pair of retaining members 6 formed on the retaining plate 4 face each other laterally across the groove 5, and the retaining members 6 have holes 3 for fastening bolts and nuts formed in the lower tip 2a of the buttress 2. Bolt/nut fastening holes 7 and reinforcing bar through holes 1 are provided at positions corresponding to the reinforcing bar through holes 9, respectively.
0 respectively.

<Function> When constructing the retaining wall according to the present invention, a thorough on-site investigation is conducted, the results are reflected in the construction plan, and the foundation ground G is formed. When the foundation ground G is a layer of soil, cracked stones, crushed stones, etc. are laid out on the bottom of the excavation, and after being sufficiently compacted, leveled concrete is poured as necessary. Before the leveled concrete hardens, the extending portion 1a of the vertical wall 1 is buried in the foundation ground G containing the concrete, and the bottom surface 2b of the buttress 2 is buried.
abut against the top surface of the concrete. On the other hand, the retaining board 4 is placed parallel to the vertical wall 1 at the lower tip 2 of the buttress wall 2.
It is buried in the foundation ground G containing concrete near a, and the lower tip 2a of the buttress 2 is fitted into the holding member 6 and the groove 5. Then, pass bolts (not shown) through the bolt/nut fastening holes 3 and 7, and
Fasten both ends of the bolt that penetrates the outside with nuts (not shown). In addition, reinforcing bars (not shown) are passed through the reinforcing bar holes 9 and 10 to connect adjacent vertical walls 1 to each other. This completes the retaining wall construction work.

<Example> A substantially L-shaped concrete buttress wall 2 with reinforcing bars is installed at the center of the back of a vertical rectangular concrete wall 1 with reinforcing bars so as to be perpendicular to the vertical wall 1.
be fixed. At the lower part of the vertical wall 1, an extending part 1a is provided which extends below the bottom surface 2b of the buttress wall 2 and has the same width as the vertical wall 1. The length of the extending portion 1a is determined in consideration of various conditions such as earth pressure. A drainage hole 8 is then formed at a proper location in the vertical wall 1. Reinforcing bar through holes 9 are provided in the lower part of the buttress wall 2 near the base and on the lower tip 2a side, respectively. Also, the lower tip 2a of the buttress 2
Drill holes 3 for fastening bolts and nuts. Reference numeral 4 denotes a retaining plate installed behind the vertical wall 1 and parallel to the vertical wall 1. A groove 5 into which the lower tip 2a of the buttress wall 2 is fitted is formed in the upper center of the retaining plate 4. A pair of holding members 6 are formed on one side (vertical wall 1 side) of the retaining plate 4 so as to face each other laterally with the groove 5 in between. The holding member 6 has bolt/nut fastening holes 7 at positions facing the bolt/nut fastening holes 3 and reinforcing bar through holes 9 formed in the lower end portion 2a of the buttress wall 2.
and reinforcing bar through holes 10 are respectively drilled. Therefore, between the groove 5 and the holding member 6, the lower tip 2 of the buttress 2
When they are fitted together, they are fastened with bolts and nuts to fix the lower tip 2a of the retaining wall 2 to the retaining member 6 of the retaining plate 4. Adjacent vertical walls 1 are successively connected by passing reinforcing bars through predetermined reinforcing bar holes 9 and 10.

<Effects of the Invention> As can be seen from the above description, the present invention eliminates the need to form a bottom slab behind the vertical wall as in the past, so there is no need to flatten the entire foundation ground.
However, it is only necessary to flatten the foundation ground at the bottom part corresponding to the thickness of the buttress, and as a result, the construction of the foundation ground can be done in a short time and is simple and easy. Moreover, both the extension part extending below the bottom of the buttress at the bottom of the vertical wall and the retaining board installed behind the vertical wall in parallel to the vertical wall are buried in the foundation ground. Because the retaining wall is integrated with the ground, it has extremely high stability against sliding due to earth pressure, etc., and is also highly stable in the event of an earthquake, increasing stability against the supporting capacity of the foundation ground, and making it easier to connect with the back embankment. The overall stability including the foundation ground is extremely high. Further, since the lower tip of the buttress is fitted into and fixed to the retaining member and the groove of the retaining plate perpendicular to the buttress, stability against overturning is also increased.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a side view showing its assembled state, and FIG. 3 is a sectional view showing its construction state. DESCRIPTION OF SYMBOLS 1... Vertical wall, 1a... Extension part, 2... Buttress wall, 2a... Lower tip part, 2b... Bottom surface, 3...
Bolt/nut fastening hole, 4...Earth retaining plate, 5...
Groove, 6... Holding member, 7... Hole for fastening bolts and nuts.

Claims (1)

[Claims] 1 An extension part extending downward from the bottom of the buttress is provided at the bottom of the vertical wall, and a hole for fastening bolts and nuts is provided at the tip of the lower part of the buttress, and the vertical wall is placed behind the vertical wall. A retaining plate is installed parallel to the retaining plate, a groove is formed in the upper part of the retaining plate into which the lower end of the buttress fits, and a pair of holding members facing laterally across the groove are attached to the retaining plate. 1. A retaining wall with retaining plate, characterized in that the retaining wall is formed into a plate, and the retaining member is provided with holes for fastening bolts and nuts.