Retaining wall

Abstract

An object of the present invention is to provide a retaining wall having a block stacking structure that does not deteriorate the workability at the installation site of the retaining wall or increase the component cost of the blocks for the retaining wall. 【Solution】In a retaining wall 1 composed of stacking a plurality of blocks in which filling spaces 7L and 7U capable of filling civil engineering materials are formed inside, the retaining wall 1 includes an inclined block body 4 having front and rear walls 4a and 4b with a slope of about 5 minutes (1:0.5), and a vertical block body 5 having vertical front and rear walls 5a and 5b connected in series above the inclined block body 4. The retaining wall 1 has an upper and lower two-part structure 14. A fitting structure 13b for connecting the two block bodies 4 and 5 is provided between the inclined block body 4 and the vertical block body 5.

Description

Technical Field

[0001] The present invention relates to a retaining wall composed of stacking a plurality of blocks having a filling space capable of filling civil engineering materials inside. Specifically, it relates to a retaining wall having a block stacking structure that does not deteriorate the workability at the installation site of the retaining wall or increase the component cost of the blocks for the retaining wall.

Background Art

[0002] Conventionally, when constructing a road in a mountainous area or the like, it is often the case that a projecting portion is separately attached to the uppermost part of a normal concrete retaining wall. However, this has problems such as low structural stability due to insufficient integrity, a decrease in load-bearing performance due to stress concentration at the base of the projecting portion, and an extension of the construction period due to separate construction of the retaining wall and the projecting portion.

[0003] Therefore, from the viewpoint of preventing these problems, a technique of forming a retaining wall by stacking a plurality of concrete blocks in a plurality of stages in the vertical direction is known. In particular, among a large number of concrete blocks, with a predetermined stage as a boundary, the front and rear walls of the concrete blocks below the predetermined stage are gentle and the same gradient surfaces, and the front and rear walls of the concrete blocks above the predetermined stage are substantially vertical. Thus, while forming an enlarged portion of the road by the uppermost concrete block, a technique of reducing the component cost by promoting the sharing of components (see Patent Document 1) is known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the retaining wall described in Patent Document 1, both the inclined portion below the aforementioned predetermined step and the vertical portion above the predetermined step are formed only by stacking a large number of concrete blocks and then placing fresh concrete in the internal space (hereinafter referred to as the "filling space"). Therefore, if there are irregularities on the upper and lower end faces of the concrete blocks, or if the pressure acting between the end faces of the concrete blocks in contact due to their position on the upper step is insufficient, gaps will occur between the end faces of the concrete blocks, and during the hardening of the fresh concrete, it is easy for the fresh concrete and water to leak out through these gaps.

[0006] For this reason, it is necessary to increase the machining accuracy of the upper and lower end faces of each concrete block, and in addition, to thicken the wall thickness of the upper and lower end faces, so as to increase the weight and the pressure acting between the end faces, or to expand the contact area between the end faces. As a result, there is a problem that the component cost increases, and the workability deteriorates due to the increase in the weight and size of the components.

[0007] Furthermore, since both the aforementioned inclined portion and the vertical portion are composed of a large number of concrete blocks, a lot of labor and time are required for their assembly construction. Moreover, if there are large irregularities on the inclined surface where the retaining wall is installed, the positions of each concrete block are likely to deviate greatly from the designed positions.

[0008] For this reason, there is also a problem that the work load during assembly construction becomes excessive, and it is necessary to prepare a large number of concrete blocks of different types and sizes according to the slope, so that the workability deteriorates further, and the component cost increases further due to the increase in the types and quantities of components.

[0009] The present invention was devised in view of the above points, and an object thereof is to provide a retaining wall having a block stacking structure that does not deteriorate the workability at the installation site of the retaining wall or increase the component cost of the blocks for the retaining wall.

Means for Solving the Problems

[0010] In order to achieve the above object, the present invention is an earth retaining wall composed of stacking a plurality of blocks having a filling space capable of filling civil engineering materials therein, wherein the earth retaining wall has an upper and lower two-part structure composed of an inclined block body having front and rear walls with a slope of about 5 minutes (1:0.5) and a vertical block body having vertical front and rear walls continuously provided above the inclined block body, and a fitting structure for connecting the two block bodies is provided between the inclined block body and the vertical block body.

[0011] And, by providing that the earth retaining wall has an upper and lower two-part structure composed of an inclined block body having front and rear walls with a slope of about 5 minutes (1:0.5) and a vertical block body having vertical front and rear walls continuously provided above the inclined block body, the earth retaining wall can be assembled only with the upper and lower two blocks of the inclined block body and the vertical block body, saving a lot of time and labor, reducing the work load during the assembly construction, and improving the constructability.

[0012] Moreover, both the inclined block body and the vertical block body are larger than the conventional concrete blocks. Even if there are large irregularities on the slope surface where the earth retaining wall is installed, these surface irregularities will be crushed by the rear walls of the two block bodies, making it difficult for the displacement of each block body to occur. There is no need to prepare a large number of concrete blocks of different types and sizes according to the slope as in the conventional case, and the component cost can be reduced.

[0013] In particular, the slope of the inclined block body having front and rear walls is about 5 minutes (1:0.5). Thereby, the inclined block body functions as an appropriate resistor against the earth pressure from the soil, and a good effect of preventing the slope from collapsing by the earth retaining wall can be obtained.

[0014] If the normal gradient of the inclined block body becomes steeper than 5 minutes, the entire retaining wall may collapse due to being unable to withstand the earth pressure from the soil, causing the collapse of the soil. Especially during rainy days, the soil is more likely to flow down, increasing the risk of causing serious landslide disasters. On the other hand, when the normal gradient becomes gentler than 5 minutes, although the resistance to the earth pressure from the soil increases, the drainage of rainwater and snowmelt water decreases, making it easier for water to accumulate in the soil, which also increases the likelihood of causing soil collapse.

[0015] Furthermore, by providing a fitting structure for connecting between the two block bodies between the inclined block body and the vertical block body, the two block bodies can be accurately connected, and it is possible to reliably prevent fresh concrete and water from leaking out from the gap between the end faces of the two block bodies. There is no need to increase the machining accuracy of the upper and lower end faces or thicken the wall thickness. Moreover, it is possible to improve the constructability and reduce the component cost.

[0016] Also, in the present invention, the center of gravity position of the vertical block body is located behind the center of gravity position of the inclined block body.

[0017] In this case, since the distribution of the ground reaction force acting on the bottom surface of the retaining wall from the ground in the front-rear direction is determined by the resultant force of the earth pressure applied to the back surface of the retaining wall from the soil and the self-weights of the inclined block body and the vertical block body, the ground reaction force has a distribution that increases towards the rear. The resistance moment that suppresses the overturning of the retaining wall increases, and the overturning stability of the retaining wall can be improved.

[0018] Also, in the present invention, the fitting structure has a first fitting portion and a second fitting portion that can be fitted to each other. The first fitting portion and the second fitting portion are respectively formed on the upper and lower surfaces of the inclined block body, and also on the upper and lower surfaces of the vertical block body. By forming the first fitting portion on the upper surface of the foundation block provided at the lower part of the retaining wall, the second fitting portion on the lower surface of the vertical block body is fitted to the first fitting portion on the upper surface of the inclined block body, and the second fitting portion on the lower surface of the inclined block body is fitted to the first fitting portion on the upper surface of the foundation block to integrate the retaining wall.

[0019] In this case, by simply processing into two types of shapes, namely the first fitting portion and the second fitting portion, it becomes possible to form all the fitting structures between the retaining wall components such as the base block, the inclined block body, and the vertical block body. By reducing the types of processing methods, the workload during processing can be reduced, and by using common tools and programs, the processing cost can be reduced. Furthermore, it becomes possible to further improve the constructability and reduce the component cost.

[0020] Furthermore, it becomes possible to change the vertical positions of the inclined block body and the vertical block body on the base block, or to change the stacking from two - layer to three - layer or four - layer according to the height of the slope surface, etc., and the degree of freedom in design can be improved.

[0021] Also, in the present invention, one of the first fitting portion and the second fitting portion is a convex shape, and the other is a concave shape that can fit into the convex shape.

[0022] In this case, since they are simple shapes of convex and concave shapes, a simple processing method can be adopted for processing the fitting portion. Thus, the workload during processing can be reduced, the processing cost can be reduced, and further improvement in constructability and reduction in component cost become possible.

[0023] Furthermore, since they are simple shapes of convex and concave shapes, even if they are slightly different from the design drawing, a certain degree of fitting strength can be obtained. From this as well, the workload during processing can be reduced and the processing cost can be reduced.

[0024] Also, in the present invention, at least one of the filling spaces of the inclined block body and the vertical block body expands in a flaring shape downward.

[0025] In this case, when placing fresh concrete into the filling space after installing the block body, that is, when injecting fresh concrete from above, even the fresh concrete that has flowed in initially has a large exposed area on its upper surface. Therefore, the light air and water in the fresh concrete will float and be discharged. Furthermore, as the injection progresses, the cross-section of the filling space also shrinks and the exposed area of the upper surface of the fresh concrete decreases. However, since the amount of fresh concrete itself also decreases, air and water can be efficiently discharged from the upper surface of the fresh concrete.

[0026] As a result, the filling space of each block body can be filled with concrete without gaps, the rigidity of each block body can be increased, and the resistance strength of the retaining wall against the earth pressure from the soil can be significantly improved.

[0027] Furthermore, since the filling space expands in a funnel-shaped manner downward, the center of gravity of each block body after filling it with fresh concrete is below the center of its height, which is excellent in stability and can further improve the overturning stability of the retaining wall.

[0028] In addition, in the present invention, at least one of the inclined block body and the vertical block body has a front-rear two-part structure composed of a front wall portion in the front and a rear wall portion connected to the rear of the front wall portion.

[0029] In this case, even if the inclined block body or the vertical block body is enlarged to cope with a high and wide slope, by dividing each block body into a front wall portion and a rear wall portion, miniaturization and weight reduction of each member can be achieved, a lot of time and labor can be saved, the work load during assembly construction can be reduced, and the constructability can be further improved.

[0030] Furthermore, for example, by detachably fastening the front wall portion and the rear wall portion with bolts or the like, according to the situation of the slope, one of the front wall portion and the rear wall portion can be easily replaced with an appropriate shape and size, and the versatility of the retaining wall can be enhanced.

[0031] In addition, in the present invention, in the above-described front and rear two-part structure, the front filling space portion on the front wall portion side is the same in the vertical direction, and the rear filling space portion on the rear wall portion side expands in a flaring shape downward.

[0032] In this case, by making the front filling space portion the same in the vertical direction and expanding the rear filling space portion in a flaring shape downward, the filling space formed by integrating the front wall portion and the rear wall portion also expands in a flaring shape downward. When pouring fresh concrete from above, even the fresh concrete that is initially poured in, since the exposed area of its upper surface is large, the light air and water in the fresh concrete will float up and be discharged. Furthermore, as the pouring progresses, although the cross-section of this filling space also shrinks and the exposed area of the fresh concrete upper surface decreases, since the amount of fresh concrete itself also decreases, air and water can be efficiently discharged from the fresh concrete upper surface.

[0033] As a result, it becomes possible to fill the filling space of each block body with concrete without gaps, increase the rigidity of each block body, and significantly improve the resistance strength of the retaining wall against the earth pressure from the soil.

[0034] Furthermore, the center of gravity of each block body after filling the filling space with fresh concrete is below the center of its height, which is excellent in stability and can further improve the overturning stability of the retaining wall.

[0035] In addition, by making the front filling space portion the same in the vertical direction and expanding the rear filling space portion in a flaring shape downward, the center of gravity position of each block body is closer to the rear, which is excellent in stability and can further improve the overturning stability of the retaining wall.

[0036] In addition, in the present invention, at least one of the inclined block body and the vertical block body forms a notch with the upper end cut off or an opening hole on the left and right side walls, and has a reinforcing structure in which a reinforcing material is inserted between the left and right notches or between the left and right holes.

[0037] In this case, when a reinforcing member such as a reinforcing bar penetrates through notches or holes formed in the left and right side walls, a plurality of reinforcing members are horizontally arranged in the filling space. Then, by injecting fresh concrete into this filling space, the concrete hardened in this filling space and each block body can be firmly integrated via the reinforcing member, and it becomes possible to prevent the adjacent retaining wall from shifting or protruding due to earth pressure.

[0038] Further, in the present invention, at least one of the inclined block body and the vertical block body is formed of high-strength concrete or plastic.

[0039] In this case, even if the wall thickness of each block body is thin, it is possible to ensure the same rigidity as that of civil engineering materials such as ordinary concrete. As a result, it becomes possible to reduce the size and weight of each block body due to the thinning of the wall thickness, save a lot of time and labor, reduce the work load during assembly construction, and further improve the workability.

[0040] Further, in the present invention, the vertical height of the inclined block body is 0.5 to 10 m, the vertical height of the vertical block body is 0.5 to 5 m, the left and right widths of the inclined block body and the vertical block body are both 0.5 to 4 m, and an uneven pattern is formed on the front wall surface of the inclined block body and the vertical block body. In addition, on the vertical block body, a guard rail foundation with a guard rail is arranged adjacent to the road.

[0041] In this case, regarding the vertical height of the inclined block body, if it is less than 0.5 m, it cannot function as a sufficient resistance body against the earth pressure applied to the back surface of the inclined block body from the soil, and protrusion and the like are likely to occur. On the other hand, if it exceeds 10 m, the inclined block body may collapse due to being unable to withstand the earth pressure from the soil, causing the collapse of the soil. Therefore, it is set to 0.5 to 10 m.

[0042] Regarding the vertical height of the vertical block body, if it is less than 0.5 m, it cannot function as a sufficient resistor against the earth pressure exerted on the back of the vertical block body from the soil, and protrusion is likely to occur. On the other hand, for a vertical block body that is vertical and has a smaller resistance to earth pressure than an inclined block body, if it exceeds 5 m, the vertical block body may not be able to withstand the earth pressure from the soil and collapse, causing the collapse of the soil. Therefore, it is set to 0.5 to 5 m.

[0043] Regarding the left - right width of the inclined block body and the vertical block body, if either is less than 0.5 m, it cannot function as a sufficient resistor against the earth pressure exerted on the back of each block body from the soil, and protrusion is likely to occur. On the other hand, if it exceeds 4 m, a gap may occur between the back of the retaining wall and the surface of the slope due to the curvature variation in the left - right direction of the slope, and rainwater or melted snow may accumulate there, causing the collapse of the soil. Therefore, it is set to 0.5 to 4 m.

[0044] Furthermore, on the front - wall surface of the inclined block body and the vertical block body, by forming an uneven pattern, rainwater will not flow down violently, and the snow accumulated on the surface of the retaining wall will not fall all at once, making it possible to smoothly pass pedestrians and vehicles passing near the bottom of the retaining wall. In addition, due to this uneven pattern, a retaining wall that blends in with a non - uniform natural landscape can be installed.

[0045] In addition, on the vertical block body, by arranging a guard - rail foundation with a guard - rail adjacent to the road, the road surface can be expanded by the area of the upper surface of the vertical block body. Compared with the case of separately attaching a protruding part to the top of a conventional concrete retaining wall, an expanded road surface with excellent structural stability and load - bearing performance can be formed in a short period.

Advantages of the Invention

[0046] According to the present invention, in a retaining wall composed of stacking a plurality of blocks having a filling space capable of filling civil engineering materials inside, it is possible to provide a retaining wall having a block stacking structure that does not deteriorate the workability at the installation site of the retaining wall or increase the component cost of the blocks for the retaining wall.

Brief Description of the Drawings

[0047]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0048] Hereinafter, embodiments of the present invention related to a retaining wall will be described with reference to the drawings to facilitate understanding of the present invention. Note that the directions indicated by the arrows U, F, and R in FIG. 1 are the upper, front, and right directions of the retaining wall according to the present invention, respectively. The positions and directions of each member described below are based on these upper U, front F, and right R directions.

[0049] First, the basic structure of a retaining wall 1, which is an example of a retaining wall to which the present invention is applied, will be described with reference to FIG. 1.

[0050] This retaining wall 1 has an upper and lower two-piece structure 14, and on top of the foundation block 3 installed on the surface of the soil 2 under the cliff, in order from the bottom, an inclined block body 4 with a rectangular horizontal cross-section and a vertical block body 5 are connected in series.

[0051] Among them, the lower inclined block body 4 has a front wall 4a and a rear wall 4b that are inclined diagonally downward in the front, and both the front wall 4a and the rear wall 4b are set at a slope of about 5 minutes (1:0.5).

[0052] This is because if the slope of the inclined block body 4 becomes steeper than 5 minutes, the retaining wall 1 will not be able to withstand the earth pressure from the soil 2. Conversely, if the slope becomes gentler than 5 minutes, although the resistance to the earth pressure from the soil 2 increases, the drainage performance of rainwater and snowmelt water decreases, making it easier for water to accumulate in the soil 2 and causing the soil 2 to collapse more easily.

[0053] Therefore, by having the front wall 4a and the rear wall 4b with a slope of about 5 minutes (1:0.5), the inclined block body 4 can function as an appropriate resistance body against the earth pressure from the soil 2.

[0054] The upper vertical block bodies 5 all have vertical front walls 5a and rear walls 5b, and the lower ends thereof are connected in series to the upper ends of the aforementioned inclined block bodies 4.

[0055] As described above, the retaining wall 1 can be assembled only with the upper and lower two block bodies 4 and 5, namely the inclined block body 4 and the vertical block body 5, saving a lot of time and labor.

[0056] Moreover, since both the inclined block body 4 and the vertical block body 5 are larger than conventional concrete blocks, even if there are large irregularities on the slope surface where the retaining wall 1 is installed, these surface irregularities are crushed by the rear walls 4b and 5b of both block bodies 4 and 5.

[0057] Also, it is preferable to use precast blocks in which civil engineering materials such as concrete are preformed into a predetermined shape in a factory for these inclined block bodies 4 and vertical block bodies 5.

[0058] When forming each block body 4 or 5 by assembling a large number of plate pieces or block pieces or pouring fresh concrete into a formwork at the installation site, precast blocks are superior in quality uniformity and also in reliability in terms of strength compared to that case.

[0059] Furthermore, for the inclined block body 4 and the vertical block body 5, concrete or plastic such as fiber-reinforced type in which reinforcing fibers such as glass and carbon are mixed into civil engineering materials other than ordinary concrete, for example, ordinary concrete or plastic, to enhance strength and toughness can be used.

[0060] Thereby, even if the wall thickness of each block body 4 or 5 is thin, rigidity equivalent to that of civil engineering materials such as ordinary concrete can be ensured, and miniaturization and weight reduction of each block body 4 or 5 due to the reduction in wall thickness can be achieved.

[0061] That is, when at least one of the inclined block body 4 and the vertical block body 5 is formed of high-strength concrete or plastic, even if the wall thickness of each block body 4 or 5 is thin, rigidity equivalent to that of civil engineering materials such as ordinary concrete can be ensured, miniaturization and weight reduction of each block body 4 or 5 due to the reduction in wall thickness can be achieved, a lot of time and labor can be saved, the work load during the assembly construction can be reduced, and the constructability can be further improved.

[0062] Also, the assembly construction of the retaining wall 1 using the inclined block body 4 and the vertical block body 5 configured as described above is carried out as follows.

[0063] First, after excavating a predetermined amount of the mountain slope forming the retaining wall 1, the above-described foundation block 3 is placed on a horizontal ground surface, the inclined block body 4 is stacked thereon, and fresh concrete 6L is placed in the filling space 7L formed in the gap between the front wall 4a and the rear wall 4b of the inclined block body 4.

[0064] Then, after the fresh concrete 6L has hardened to a certain extent, the lower surface of the vertical block body 5 is placed on the upper surface of the inclined block body 4 and stacked, and the fresh concrete 6U is placed in the filling space 7U formed in the gap between the front wall 5a and the rear wall 5b of the vertical block body 5.

[0065] In this way, the block bodies 4 and 5 filled with the fresh concrete 6L and 6U respectively are stacked on the foundation block 3 to form the retaining wall 1.

[0066] Also, in the retaining wall 1 configured in this way, a card rail foundation 9 that supports the lower end of the guard rail 8 is placed on the upper surface 5c of the vertical block body 5.

[0067] And behind this guard rail foundation 9, the road 10 is continuously provided so that its rear upper surface 9a and the road surface 10a are on the same plane.

[0068] In this way, by arranging the guard rail foundation 9 with the guard rail 8 adjacent to the road 10 on the vertical block body 5, the road surface 10a can be extended by the amount of the upper surface 5c of the vertical block body 5.

[0069] Next, the detailed configuration of the retaining wall 1 having such an overall configuration will be described with reference to FIGS. 1 to 3.

[0070] As shown in FIGS. 1 and 2, on the back surface of the retaining wall 1, specifically, on the block surface from the rear wall 4b of the inclined block body 4 to the rear wall 5b of the vertical block body 5, the earth pressure PE from the sloped soil 2 acts. According to the resultant force F1 of this earth pressure PE, the self-weight 4W of the inclined block body 4, and the self-weight 5W of the vertical block body 5, the ground reaction force F2 acting on the bottom surface 1a of the retaining wall 1 also changes.

[0071] Specifically, as in this embodiment, by positioning the center of gravity position 5G of the vertical block body 5 behind the center of gravity position 4G of the inclined block body 4, specifically, behind by the distance 12 in the front-rear direction in this embodiment, the resultant force F1 described above increases more towards the rear, and accordingly, the ground reaction force F2 also shows a reaction force distribution that increases more towards the rear.

[0072] Then, with respect to the rotational moment that causes the retaining wall 1 to rotate in the direction of arrow 16 about the tip 1b at the lower end and tend to fall forward, such a reaction force distribution acts strongly as a resistance moment that suppresses the fall of the retaining wall 1.

[0073] That is, when the center of gravity position 5G of the vertical block body 5 is located behind the center of gravity position 4G of the inclined block body 4, the front-rear direction distribution of the ground reaction force F2 acting on the bottom surface 1a of the retaining wall 1 from the ground is determined by the resultant force F1 of the earth pressure PE applied from the soil 2 to the back surface of the retaining wall 1 and the respective self-weights 4W and 5W of the inclined block body 4 and the vertical block body 5. Therefore, the ground reaction force F2 has a reaction force distribution that increases more towards the rear, the resistance moment that suppresses the fall of the retaining wall 1 increases, and the fall stability of the retaining wall 1 can be improved.

[0074] Also, as shown in FIGS. 1 and 3, a first fitting portion 3f1 is formed on the upper surface of the aforementioned base block 3, and a first fitting portion 4f1 and a second fitting portion 4f2 are respectively formed on the upper and lower surfaces of the inclined block body 4. Further, a first fitting portion 5f1 and a second fitting portion 5f2 are also respectively formed on the upper and lower surfaces of the vertical block body 5.

[0075] And all of the first fitting portions 3f1, 4f1, and 5f1 have the same convex shape, and all of the second fitting portions 4f2 and 5f2 have the same concave shape, and these first fitting portions 3f1, 4f1, and 5f1 and the second fitting portions 4f2 and 5f2 are mutually engageable.

[0076] Then, a fitting structure 13a is formed by fitting the second fitting portion 4f2 on the lower surface of the inclined block body 4 to the first fitting portion 3f1 on the upper surface of the base block 3, and a fitting structure 13b is formed by fitting the second fitting portion 5f2 on the lower surface of the vertical block body 5 to the first fitting portion 4f1 on the upper surface of the inclined block body 4, so that the retaining wall 1 can be integrated.

[0077] Thus, by simply machining into two types of shapes, namely the first fitting portions 3f1, 4f1, 5f1 and the second fitting portions 4f2, 5f2, all the fitting structures between the retaining wall components such as the base block 3, the inclined block body 4, and the vertical block body 5 can be formed.

[0078] Furthermore, since the first fitting portions 3f1, 4f1, 5f1 and the second fitting portions 4f2, 5f2 are simple shapes of convex and concave shapes, a simple processing method can be adopted for machining the fitting portions, and a certain degree of fitting strength can be obtained even if it is slightly different from the design drawing.

[0079] In particular, by interposing such a fitting structure 13b between the inclined block body 4 and the vertical block body 5, the two block bodies 4 and 5 can be accurately connected.

[0080] That is, with the above configuration, in the retaining wall 1 composed of stacking a plurality of blocks having a filling space inside which civil engineering materials can be filled, the retaining wall 1 includes an inclined block body 4 having front and rear walls 4a and 4b with a slope of about 5 minutes (1:0.5), and a vertical block body 5 connected above the inclined block body 4 and having vertical front and rear walls 5a and 5b, and a fitting structure 13b for connecting the two block bodies 4 and 5 is interposed between the inclined block body 4 and the vertical block body 5.

[0081] And by providing such an upper and lower two-part structure 14, as described above, the retaining wall 1 can be assembled only with the upper and lower two blocks of the inclined block body 4 and the vertical block body 5, saving a lot of time and labor, reducing the work load during assembly construction, and improving the constructability.

[0082] Moreover, as described above, both the inclined block body 4 and the vertical block body 5 are larger than conventional concrete blocks. Even if there are significant irregularities on the slope surface where the retaining wall 1 is installed, these surface irregularities will be crushed by the rear walls 4b and 5b of both block bodies 4 and 5. Therefore, displacement of each block body 4 and 5 is less likely to occur, eliminating the need to prepare a large number of concrete blocks of different types and sizes according to the slope as in the past, and reducing component costs.

[0083] In particular, the normal slope of the inclined block body 4 having front and rear walls is set to about 5 minutes (1:0.5). Thereby, the inclined block body 4 functions as an appropriate resistance body against the earth pressure PE from the soil 2, and a good effect of preventing slope collapse by the retaining wall can be obtained.

[0084] If the normal slope of the inclined block body becomes steeper than 5 minutes, the entire retaining wall 1 may collapse without being able to withstand the earth pressure PE from the soil 2, causing the collapse of the soil 2. Especially during rainy days, the soil 2 is more likely to flow down, increasing the risk of causing serious landslide disasters. On the other hand, if the slope is gentler than 5 minutes, although the resistance to the earth pressure PE from the soil 2 increases, the drainage of rainwater and snowmelt water decreases, making it easier for water to accumulate in the soil 2, which also increases the possibility of causing the collapse of the soil 2.

[0085] Furthermore, by providing a fitting structure 13b for connecting between both block bodies 4 and 5 between the inclined block body 4 and the vertical block body 5, both block bodies 4 and 5 can be accurately connected. It is possible to reliably prevent fresh concrete and water from leaking out through the gap between the end faces of both block bodies 4 and 5, eliminating the need to increase the machining accuracy of the upper and lower end faces or increase the wall thickness, and further improving constructability and reducing component costs.

[0086] In addition, the fitting structures 13a and 13b have first fitting portions 3f1, 4f1, 5f1 and second fitting portions 4f2, 5f2 that can be fitted to each other. Among these, the first fitting portion 4f1 and the second fitting portion 4f2 are respectively formed on the upper and lower surfaces of the inclined block body 4, and the first fitting portion 5f1 and the second fitting portion 5f2 are also respectively formed on the upper and lower surfaces of the vertical block body 5. By forming the first fitting portion 3f1 on the upper surface of the foundation block 3 provided at the lower part of the retaining wall 1, the second fitting portion 5f2 on the lower surface of the vertical block body 5 is fitted to the first fitting portion 4f1 on the upper surface of the inclined block body 4, and the second fitting portion 4f2 on the lower surface of this inclined block body 4 is fitted to the first fitting portion 3f1 on the upper surface of the foundation block 3 to integrate the retaining wall 1. When this is the case, by simply processing into two types of shapes, namely the first fitting portions 3f1, 4f1, 5f1 and the second fitting portions 4f2, 5f2, it becomes possible to form all the fitting structures 13a and 13b between the retaining wall components such as the foundation block 3, the inclined block body 4, and the vertical block body 5. It is possible to reduce the work load during processing due to the reduction in the types of processing methods, and to reduce the processing cost by using common tools and programs, and it is further possible to improve the constructability and reduce the component cost.

[0087] Furthermore, it becomes possible to change the vertical positions of the inclined block body 4 and the vertical block body 5 on the foundation block 3, or to change the stacking from two - stage to three - stage or four - stage stacking according to the height of the slope, etc., and the degree of freedom in design can be improved.

[0088] In addition, when one of the first fitting portions 3f1, 4f1, 5f1 and the second fitting portions 4f2, 5f2 is a convex shape and the other is a concave shape that can be fitted to the convex shape, since they are simple shapes of convex and concave, a simple processing method can be adopted for processing the fitting portions 3f1, 4f1, 4f2, 5f1, 5f2. It is possible to reduce the work load during processing and the processing cost, and it is further possible to improve the constructability and reduce the component cost.

[0089] Furthermore, since they are simple shapes of convex and concave, even if they are slightly different from the design drawing, a certain degree of fitting strength can be obtained, and from this as well, it is possible to reduce the work load during processing and the processing cost.

[0090] Also, as shown in FIG. 1, uneven patterns 15 having an uneven shape in cross-section can be formed on the surfaces of the front walls 4a and 5a of the respective block bodies 4 and 5.

[0091] Thereby, this uneven pattern 15 functions as a resistor to prevent water and snow from sliding down at once, and it is possible to prevent rainwater from flowing down violently or snow accumulated on the surface of the retaining wall from falling at once.

[0092] Note that the uneven pattern 15 may not be wavy lines randomly distributed as in this embodiment, but may be linear extending in the left-right direction or small protruding shapes that are dispersed, and as long as it can serve as a resistance to prevent water and snow from sliding down on the surfaces of the front walls 4a and 5a at once, its form is not particularly limited.

[0093] Furthermore, it is preferable to set the vertical height 4H of the inclined block body 4 to 0.5 to 10 m, the vertical height 5H of the vertical block body 5 to 0.5 to 5 m, and the left-right width W of both the inclined block body 4 and the vertical block body 5 to 0.5 to 4 m.

[0094] Regarding the vertical height 4H of the inclined block body 4, if it is less than 0.5 m, it is too low to function as a sufficient resistor against the earth pressure PE, and if it exceeds 10 m, it is too high and there is a possibility that the inclined block body 4 may collapse without being able to withstand the earth pressure.

[0095] Regarding the vertical height 5H of the vertical block body 5 as well, if it is less than 0.5 m, it is too low to function as a sufficient resistor against the earth pressure PE, and since it is vertical and the resistance to the earth pressure PE is small, there is a possibility that the vertical block body 5 may collapse without being able to withstand the earth pressure PE just by exceeding 5 m.

[0096] Regarding the left-right width W of both the inclined block body 4 and the vertical block body 5 as well, if it is less than 0.5 m, it is too narrow to function as a sufficient resistor against the earth pressure PE, and if it exceeds 4 m, a gap may be generated between the back surface of the retaining wall 1 and the surface of the slope due to the curvature variation in the left-right direction of the slope, and there is a possibility that rainwater or snowmelt water may accumulate there.

[0097] That is, the vertical height 4H of the inclined block body 4 is 0.5 to 10 m, the vertical height 5H of the vertical block body 5 is 0.5 to 5 m, and the left and right widths W of the inclined block body 4 and the vertical block body 5 are both 0.5 to 4 m. An uneven pattern 15 is formed on the surfaces of the front walls 4a and 5a of the inclined block body 4 and the vertical block body 5. When a guardrail foundation 9 with a guardrail 8 is disposed adjacent to the road 10 on the vertical block body 5, for the vertical height 4H of the inclined block body 4 among these, if it is less than 0.5 m, it cannot function as a sufficient resistor against the earth pressure PE applied from the soil 2 to the back surface of the inclined block body 4, and overhangs and the like are likely to occur. On the other hand, if it exceeds 10 m, the inclined block body 4 may not withstand the earth pressure PE from the soil 2 and collapse, causing the collapse of the soil 2. Therefore, it is set to 0.5 to 10 m.

[0098] For the vertical height 5H of the vertical block body 5, if it is less than 0.5 m, it cannot function as a sufficient resistor against the earth pressure PE applied from the soil 2 to the back surface of the vertical block body 5, and overhangs and the like are likely to occur. On the other hand, in the vertical block body 5 whose resistance to earth pressure is smaller than that of the inclined block body 4 due to being vertical, if it exceeds 5 m only, the vertical block body 5 may not withstand the earth pressure PE from the soil 2 and collapse, causing the collapse of the soil 2. Therefore, it is set to 0.5 to 5 m.

[0099] For the left and right widths W of the inclined block body 4 and the vertical block body 5, if either is less than 0.5 m, it cannot function as a sufficient resistor against the earth pressure PE applied from the soil 2 to the back surfaces of the respective block bodies 4 and 5, and overhangs and the like are likely to occur. On the other hand, if it exceeds 4 m, a gap is generated between the back surface of the retaining wall 1 and the surface of the slope due to the curvature variation in the left and right directions of the slope, and rainwater or snowmelt water may accumulate there, causing the collapse of the soil. Therefore, it is set to 0.5 to 4 m.

[0100] Furthermore, on the surfaces of the front walls 4a and 5a of the inclined block body 4 and the vertical block body 5, uneven patterns 15 are formed, so that rainwater does not flow down violently and the snow accumulated on the surface of the retaining wall 1 does not fall all at once, enabling smooth passage of pedestrians and vehicles passing near the bottom of the retaining wall 1. In addition, due to this uneven pattern 15, a retaining wall that blends in with a non-uniform natural landscape can be installed.

[0101] In addition, as described above, by arranging the guardrail foundation 9 with the guardrail 8 adjacent to the road 10 on the vertical block body 5, the road surface 10a can be expanded by the area of the upper surface of the vertical block body 5. Compared with the case of separately attaching a protruding part to the top of a conventional concrete retaining wall, an expanded road surface with excellent structural stability and load-bearing performance can be formed in a short period of time.

[0102] Next, a retaining wall 1A in a different form from the above-described retaining wall 1 will be described with reference to FIGS. 4 and 5. This retaining wall 1A also has a two-piece structure 20, similar to the above-described retaining wall 1. On the foundation block 2 installed on the surface of the soil 2 under the cliff, an inclined block body 21 and a vertical block body 24 with a rectangular horizontal cross-section are connected in sequence from bottom to top.

[0103] However, different from the retaining wall 1, at least one of the inclined block body 21 and the vertical block body 24, in this embodiment, both block bodies 21 and 24 have a front-back two-piece structure 27 and 28.

[0104] Specifically, as shown in FIG. 4, the lower inclined block body 21 has a front-back two-piece structure 27 composed of a front wall portion 22 in the front and a rear wall portion 23 connected in series behind the front wall portion 22.

[0105] Among these, the front wall portion 22 is composed of a front wall 22a inclined obliquely downward to the front and left and right side walls 22b1 and 22b2 extending rearward from near the left and right side edges of the front wall 22a. The rear wall portion 23 is composed of a rear wall 23a inclined obliquely downward to the front and left and right side walls 23b1 and 23b2 extending forward from near the left and right side edges of the rear wall 23a.

[0106] Among these, the rear end edges of the left and right side walls 22b1 and 22b2 of the front wall portion 22 and the front end edges of the left and right side walls 23b1 and 23b2 of the rear wall portion 23 have slopes with the same gradient as the front and rear walls 22a and 23b, and are respectively arranged on the same left and right vertical cross-sections extending in the front-rear direction. The left side wall 22b1 and the side wall 23b1 are in an inclined posture and are in contact with each other, and the right side wall 22b2 and the side wall 23b2 can also be in contact with each other in an inclined posture.

[0107] In this way, after sandwiching the front wall portion 22 and the rear wall portion 23 from the front and rear, and bringing the rear end edges of the left and right side walls 22b1 and 22b2 into contact with the front end edges of the left and right side walls 23b1 and 23b2 in an inclined posture respectively, a plurality of bolts 29 are passed through the left and right side walls 23b1 and 23b2 of the rear wall portion 23 from the rear and then screwed into the left and right side walls 22b1 and 22b2 of the front wall portion 22 respectively, so that the rear wall portion 23 can be detachably fastened to the front wall portion 22.

[0108] As shown in FIG. 5, the upper vertical block body 24 also has a front-rear two-part structure 28 composed of a front wall portion 25 in the front and a rear wall portion 26 connected to the rear of the front wall portion 25, similar to the inclined block body 21.

[0109] Among these, the front wall portion 25 is composed of a vertical front wall 25a and left and right side walls 25b1 and 25b2 extending rearward from near the left and right side edges of the front wall 25a. The rear wall portion 26 is composed of a vertical rear wall 26a and left and right side walls 26b1 and 26b2 extending forward from near the left and right side edges of the rear wall 26a.

[0110] Of these, the rear edges of the left and right side walls 25b1 and 25b2 of the front wall portion 25 and the front edges of the left and right side walls 26b1 and 26b2 of the rear wall portion 26 are all vertical and are respectively arranged on the same left and right vertical cross-sections extending in the front-rear direction. The left side wall 25b1 and the side wall 26b1 are in contact with each other in a vertical posture, and the right side wall 25b2 and the side wall 26b2 can also be in contact with each other in a vertical posture.

[0111] In this way, after sandwiching the front wall portion 25 and the rear wall portion 26 from the front and rear and bringing the left and right side walls 25b1 and 25b2 and the left and right side walls 26b1 and 26b2 into contact with each other in a vertical posture respectively, a plurality of bolts 29 are passed through the side walls 26b1 and 26b2 of the rear wall portion 26 from the rear and then screwed into the left and right side walls 25b1 and 25b2 of the front wall portion 25 respectively, so that the rear wall portion 26 can be detachably fastened to the front wall portion 25.

[0112] That is, when at least one of the inclined block body 21 and the vertical block body 24, in this embodiment, both block bodies 21 and 24, has a front-rear two-part structure 27 and 28 composed of a front front wall portion 22 and 25 and a rear wall portion 23 and 26 connected continuously behind this front wall portion 22 and 25, even if the inclined block body 21 or the vertical block body 24 is enlarged to correspond to a high and wide slope, by dividing each block body 21 and 24 into the front wall portion 22 and 25 and the rear wall portion 23 and 26, miniaturization and weight reduction of each member can be achieved, and a lot of time and labor can be saved to reduce the work load during assembly construction, and the constructability can be further improved.

[0113] Furthermore, for example, by detachably fastening the front wall portions 22 and 25 and the rear wall portions 23 and 26 with bolts 29 or the like, one of the front wall portions 22 and 25 and the rear wall portions 23 and 26 can be easily replaced with one of an appropriate shape and size according to the situation of the slope, and the versatility of the retaining wall can be enhanced.

[0114] Next, a retaining wall 1B in a different form from the above-described retaining wall 1A will be described with reference to FIGS. 4 to 6. The retaining wall 1B shown in Fig. 6 is obtained by adding reinforcing structures 30 and 31 to the inclined block body 21 and the vertical block body 24 of the retaining wall 1A shown in Figs. 4 and 5, resulting in the inclined block body 21X and the vertical block body 24X.

[0115] Specifically, in the inclined block body 21 shown in Fig. 4, at the upper corners of the rear edges of the left and right side walls 22b1 and 22b2 of the front wall portion 22, notch portions 32a and 33a are formed, while at the upper corners of the front edges of the left and right side walls 23b1 and 23b2 of the rear wall portion 23, notch portions 32b and 33b are formed.

[0116] Then, as described above, when the rear wall portion 23 is detachably fastened to the front wall portion 22, on the upper edges of the left and right side walls of the inclined block body 21, a left notch 32 formed by the front and rear notch portions 32a and 32b and a right notch 33 formed by the front and rear notch portions 33a and 33b are formed.

[0117] Furthermore, two upper and lower holes 36 and 37 are drilled in the left and right directions in the middle of the left side wall 23b1 of the rear wall portion 23, and two upper and lower holes 38 and 39 are also drilled in the left and right directions in the middle of the right side wall 23b2. Among these, the upper left and right holes 36 and 38 are formed on the same axis in the left and right directions, and the lower left and right holes 37 and 39 are also formed on the same axis in the left and right directions.

[0118] Between the left and right notches 32 and 33, between the upper left and right holes 36 and 38, and between the lower left and right holes 37 and 39 formed in this way, round bar-shaped reinforcing bars 40 can be inserted in the left and right directions as reinforcing members.

[0119] Then, since a plurality of reinforcing bars 40 are horizontally spanned in the filling space 43 of the inclined block body 21, subsequently, by injecting fresh concrete into this filling space 43, the reinforcing structure 30 is constituted.

[0120] In this way, an inclined block body 21X having front and rear wall portions 22X and 23X with the reinforcing structure 30 added to the aforementioned inclined block body 21 is formed.

[0121] Also in the vertical block body 24 shown in Fig. 5, similar to the inclined block body 21 described above, at the upper corners of the rear edges of the left and right side walls 25b1 and 25b2 of the front wall portion 25, notch portions 34a and 35a are formed, while at the upper corners of the front edges of the left and right side walls 26b1 and 26b2 of the rear wall portion 26, notch portions 34b and 35b are formed.

[0122] When the rear wall portion 26 is detachably fastened to the front wall portion 25, on the upper edge of the left and right side walls of the vertical block body 24, a left notch 34 composed of the front and rear notch portions 34a and 34b and a right notch 35 composed of the front and rear notch portions 35a and 35b are formed.

[0123] Furthermore, in the middle of the left side wall 26b1 of the rear wall portion 26 in the vertical direction, one hole 41 is drilled in the left - right direction, and in the middle of the right side wall 26b2 of the rear wall portion 26 in the vertical direction, one hole 42 is also drilled in the left - right direction, and the left and right holes 41 and 42 are formed on the same axis in the left - right direction.

[0124] Between the left and right notches 34 and 35 formed in this way, and between the left and right holes 41 and 42, the above - mentioned reinforcing bars 40 can be inserted in the left - right direction.

[0125] Then, also in the vertical block body 24, similar to the inclined block body 21, since a plurality of reinforcing bars 40 are horizontally arranged in the filling space 44, after that, by injecting fresh concrete into this filling space 44, a reinforcing structure 31 is formed.

[0126] In this way, a vertical block body 24X having front and rear wall portions 25X and 26X with the reinforcing structure 31 added to the above - mentioned vertical block body 24 is formed.

[0127] That is, at least one of the inclined block body 21X and the vertical block body 24X, in this embodiment both block bodies 21X and 24X, form notches 32, 33, 34, 35 with the upper ends cut out or openings 36, 38, 37, 39, 41, 42 in the left and right side walls 22b1, 22b2, 23b1, 23b2, 25b1, 25b2, 26b1, 26b2, and have a reinforcement structure 30, 31 in which a reinforcing bar 40, which is a reinforcing material, is inserted between the left and right notches 32, 33, 34, 35 or between the left and right openings 36, 38, 37, 39, 41, 42. When a reinforcing member such as the reinforcing bar 40 penetrates through the notches 32, 33, 34, 35 and the openings 36, 38, 37, 39, 41, 42 formed in the left and right side walls 22b1, 22b2, 23b1, 23b2, 25b1, 25b2, 26b1, 26b2, a plurality of reinforcing bars 40 are horizontally spanned in the filling spaces 43, 44. Thereafter, by injecting fresh concrete into this filling space 43, 44, the concrete hardened in this filling space 43, 44 and each block body 21X, 24X can be firmly integrated via the reinforcing bar 40, and it becomes possible to prevent the adjacent retaining wall 1B from shifting or protruding due to the earth pressure PE.

[0128] Next, a retaining wall 1C of a different form from the aforementioned retaining wall 1A will be described with reference to FIGS. 4, 5, and 7. The retaining wall 1C shown in FIG. 7 has the side surface shapes of the inclined block body 21 and the vertical block body 24 of the retaining wall 1A shown in FIGS. 4 and 5 expanded in a flaring shape downward, and is the inclined block body 21Y and the vertical block body 24Y.

[0129] Specifically, the inclined block body 21Y shown in FIG. 7 has a front-back two-part structure composed of front and rear wall portions 22Y and 23Y. In the front wall portion 22Y among these, the lower front-back length 22L1 at the lower end is the same as the upper front-back length 22L2 at the upper end, while in the rear wall portion 23Y, the lower front-back length 23L1 is larger than the upper front-back length 23L2.

[0130] As a result, the filling space portion 47a on the front wall portion 22Y side is the same in the vertical direction, while the rear filling space portion 47b on the rear wall portion 23Y side expands in a funnel-shaped manner downward. Therefore, the filling space 47 of the inclined block body 21Y also expands in a funnel-shaped manner downward.

[0131] The vertical block body 24Y also has a front and rear two-part structure composed of front and rear wall portions 25Y and 26Y. Among these, in the front wall portion 25Y, the front and rear length 25L1 at the lower end is the same as the front and rear length 25L2 at the upper end, while in the rear wall portion 26Y, the front and rear length 26L1 at the lower end is larger than the front and rear length 26L2 at the upper end.

[0132] As a result, the front filling space portion 48a on the front wall portion 25Y side is the same in the vertical direction, while the rear filling space portion 48b on the rear wall portion 26Y side expands in a funnel-shaped manner downward. Therefore, the filling space 48 of the vertical block body 24Y also expands in a funnel-shaped manner downward.

[0133] Note that the sum of the front and rear lengths 22L2 and 23L2 at the upper end of the inclined block body 21Y is the same as the sum of the front and rear lengths 25L1 and 26L1 at the lower end of the vertical block body 24Y, and the inclined block body 21Y and the vertical block body 24Y are connected in series.

[0134] In this way, by expanding the filling spaces 47 and 48 in a funnel-shaped manner downward, when fresh concrete is poured, the air and water inside can be efficiently discharged from the upper surface of the fresh concrete. Furthermore, the center of gravity of each block body 21Y and 24Y after filling with fresh concrete is below the center of its height, improving stability.

[0135] In addition, by making the front filling space portions 47a and 48a the same in the vertical direction and expanding the rear filling space portions 47b and 48b in a funnel-shaped manner downward, the center of gravity position of each block body 21Y and 24Y can be set closer to the rear.

[0136] That is, in at least one of the inclined block body 21Y and the vertical block body 24Y, in this embodiment, when the filling spaces 47 and 48 of both block bodies 21Y and 24Y expand in a flaring shape downward, after installing the block bodies 21Y and 24Y, when placing fresh concrete into the filling spaces 47 and 48, that is, when injecting fresh concrete from above, even for the initially poured fresh concrete, since the exposed area of its upper surface is large, the light air and water in the fresh concrete will float and be discharged. Further, as the injection progresses, the cross-section of the filling spaces 47 and 48 also shrinks and the exposed area of the upper surface of the fresh concrete decreases, but since the amount of fresh concrete itself also decreases, air and water can be efficiently discharged from the upper surface of the fresh concrete.

[0137] As a result, the filling spaces 47 and 48 of each block body 21Y and 24Y can be filled with concrete without gaps, the rigidity of each block body 21Y and 24Y can be increased, and the resistance strength of the retaining wall 1C against the earth pressure PE from the soil 2 can be significantly improved.

[0138] Furthermore, since the filling spaces 47 and 48 expand in a flaring shape downward, the center of gravity of each block body 21Y and 24Y after filling them with fresh concrete will be below the center of its height, which is excellent in stability and can further improve the overturning stability of the retaining wall 1C.

[0139] Particularly, in the front-back two-part structure, when the front filling space parts 47a and 48a on the front wall parts 22Y and 25Y side are the same in the vertical direction and the rear filling space parts 47b and 48b on the rear wall parts 23Y and 26Y side expand in a flaring shape downward, the center of gravity position of each block body 21Y and 24Y will be closer to the rear, which is excellent in stability and can further improve the overturning stability of the retaining wall 1C.

[0140] As described above, the retaining wall according to the present invention is provided with a retaining wall having a block stacking structure that does not deteriorate the workability at the installation site of the retaining wall or increase the component cost of the blocks for the retaining wall.

[0141] Although the present invention has been described through the above embodiments, the present invention is not limited thereto. Further, each of the above-described effects merely lists the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in this embodiment.

Explanation of Reference Numerals

[0142] 1, 1A, 1B, 1C Retaining Wall 3 Foundation Block 3f1, 4f1, 5f1 First Fitting Portion 4, 21, 21X, 21Y Inclined Block Body 4a, 5a Front Wall 4b, 5b Rear Wall 4f2, 5f2 Second Fitting Portion 4G Center of Gravity Position 4H Vertical Height 5, 24, 24X, 24Y Vertical Block Body 5G Center of Gravity Position 5H Vertical Height 7L, 7U, 47, 48 Filling Space 8 Guard Rail 9 Guard Rail Foundation 10 Road 13b Fitting Structure 14 Upper and Lower Two-Part Structure 15 Concave-Convex Pattern 22, 22Y, 25, 25Y Front Wall Portion 22b1, 22b2, 23b1, 23b2, 25b1, 25b2, 26b1, 26b2 Side Wall 23, 23Y, 26, 26Y Rear Wall Portion 27, 28 Front and Rear Two-Part Structure 30, 31 Reinforcement Structure 32, 33, 34, 35 Notch 36, 38, 37, 39, 41, 42 Hole 40 Steel Bar (Reinforcement) 47a, 48a Front Filling Space Portion 47b, 48b Rear Filling Space Portion W Left-Right Width

Claims

1. In a retaining wall composed of stacking a plurality of blocks each having a filling space inside which can be filled with civil engineering materials, the retaining wall has an upper and lower two-part structure composed of an inclined block body having front and rear walls with a slope gradient of about 5 minutes (1:0.5) and a vertical block body continuously provided above the inclined block body and having vertical front and rear walls, a fitting structure for connecting the two block bodies is interposed between the inclined block body and the vertical block body and is characterized by such a retaining wall.

2. The center of gravity position of the vertical block body is located behind the center of gravity position of the inclined block body and is characterized by the retaining wall according to Claim 1.

3. The fitting structure has a first fitting portion and a second fitting portion that can be fitted to each other, the first fitting portion and the second fitting portion are respectively formed on the upper and lower surfaces of the inclined block body, also respectively formed on the upper and lower surfaces of the vertical block body, and the first fitting portion is formed on the upper surface of a foundation block provided at the lower part of the retaining wall, whereby the second fitting portion on the lower surface of the vertical block is fitted to the first fitting portion on the upper surface of the inclined block body, and the second fitting portion on the lower surface of the inclined block body is fitted to the first fitting portion on the upper surface of the foundation block to integrate the retaining wall and is characterized by the retaining wall according to Claim 1 or Claim 2.

4. One of the first fitting portion and the second fitting portion is convex, and the other is concave that can be fitted to the convex shape and is characterized by the retaining wall according to Claim 3.

5. At least one of the filling spaces of the inclined block body and the vertical block body widens in a flaring shape downward and is characterized by the retaining wall according to Claim 1 or Claim 2.

6. At least one of the inclined block body and the vertical block body has a front and rear two-part structure composed of a front wall portion in the front and a rear wall portion continuously provided behind the front wall portion and is characterized by the retaining wall according to Claim 1 or Claim 2.

7. In the front and rear two-part structure, the front filling space portion on the front wall portion side is the same in the vertical direction, and the rear filling space portion on the rear wall portion side widens in a flaring shape downward and is characterized by the retaining wall according to Claim 6.

8. At least one of the inclined block body and the vertical block body has a reinforcing structure in which notches with the upper ends cut off or openings are formed on the left and right side walls, and a reinforcing material is inserted between the left and right notches or between the left and right openings and is characterized by the retaining wall according to Claim 1 or Claim 2.

9. At least one of the inclined block body and the vertical block body is formed of high-strength concrete or plastic The retaining wall according to claim 1 or claim 2, characterized in that.

10. The vertical height of the inclined block body is 0.5 to 10 m, the vertical height of the vertical block body is 0.5 to 5 m, the left and right widths of the inclined block body and the vertical block body are both 0.5 to 4 m, and an uneven pattern is formed on the front wall surface of the inclined block body and the vertical block body. In addition, on the vertical block body, a guardrail foundation with a guardrail is arranged adjacent to the road. The retaining wall according to claim 1 or claim 2, characterized in that.

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