Block for retaining wall

Abstract

To provide a block for a retaining wall, a surface walls of which can be easily formed as approximately one flat surface even if a slope of soil on which the plurality blocks for a retaining wall are installed is partially protruding or recessed.SOLUTION: The problem was solved by a block for a retaining wall comprising a front wall portion (1) having a surface exposed to the outside, and a buttress portion (2) protruding from a back surface (1a) of the front wall portion (1) opposite the front surface and having a height lower than the vertical height of the front wall (1) when in use, and the retaining wall block having a recess portion (21) and a protrusion portion (22) of a shape which can engage with each other along the longitudinal direction of the buttress portion (2) on at least one of the upper surface (2a) which is the upper surface of the buttress portion (2) when in use or the lower surface (2b).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a retaining wall block that is installed against a slope to prevent the collapse of a soil slope. [Background technology]

[0002] Conventionally, concrete retaining walls have been installed on slopes to prevent the collapse of soil slopes. A number of concrete retaining walls are lined up or stacked along the width or height of the soil slope to cover the slope.

[0003] For example, Patent Document 1 discloses a retaining wall block to be placed at the bend of a box-shaped retaining wall, which includes an upright face plate, a supporting plate that stands at a distance behind the face plate, and two connecting plates that connect the left-right middle portions of the face plate and the supporting plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-137714 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the retaining wall blocks described in Patent Document 1 are pre-molded using a formwork of a predetermined size, and the length of the connecting plates protruding from the rear of the face plate is fixed. Therefore, if the slope of the soil on which the blocks are to be installed is partially protruding or recessed, in order to make the face plates of multiple retaining wall blocks into roughly a single flat surface, it is necessary to prepare multiple types of retaining wall blocks with different lengths of connecting plates protruding from the rear of the face plate, which creates the problem of being extremely time-consuming.

[0006] Therefore, the present invention aims to provide a retaining wall block whose surface walls can be easily formed as approximately one flat surface even if the slope of the soil on which the multiple retaining wall blocks are to be installed is partially protruding or recessed. [Means for solving the problem]

[0007] [1] In other words, the present invention is a retaining wall block characterized by having a front wall portion (1) having a surface exposed to the outside, and a buttress portion (2) protruding from a back surface (1a) of the front wall portion (1) opposite the front surface, and having a height lower than the vertical height of the front wall (1) when in use.

[0008] [2] The retaining wall block described in [1] is characterized in that at least one of the upper surface (2a) or the lower surface (2b) of the retaining wall portion (2) when in use has a recess portion (21) and a protrusion portion (22) having a shape that can engage with each other along the longitudinal direction of the retaining wall portion (2).

[0009] [3] The retaining wall block described in [2] above is characterized in that it has either a form in which a plurality of the recesses (21) and a plurality of the protrusions (22) are provided, or a form in which a plurality of the recesses (21) are provided and one protrusion (22) is provided.

[0010] [4] The retaining wall block is characterized in that a plurality of the recesses (21) are provided, and at least one separate engagement pin (4) capable of engaging with the recesses (21) engages with the recesses (21) to form the protrusions (22).

[0011] [5] The retaining wall block is characterized in that the recessed portion (21) and the protrusion portion (22) are either one of a truncated pyramid shape, a truncated cone shape, a pyramid shape, a cone shape, a rectangular column shape, a cylindrical shape, an approximately semi-cylindrical shape, or an approximately hemispherical shape.

[0012] [6] The retaining wall block is characterized in that the ridge line of at least one of the upper surface (2a) or the lower surface (2b) of the recessed portion (21) and the protrusion portion (22) in a side view is one of a periodic curved shape, a periodic triangular shape, and a periodic rectangular shape. Effect of the Invention

[0013] The retaining wall blocks of the present invention have the advantage that even if the slope of the soil on which the multiple retaining wall blocks are to be installed is partially protruding or recessed, the surface walls of the multiple retaining wall blocks can be easily formed as approximately a single flat surface. [Brief description of the drawings]

[0014] [Figure 1] 1 is a perspective view showing a first embodiment of a retaining wall block of the present invention. FIG. [Diagram 2] 1 is a right side view showing a first embodiment of a retaining wall block of the present invention. FIG. [Diagram 3] 1 is an exploded oblique view showing the intermediate state in which two first embodiments of the retaining wall blocks of the present invention are being assembled together. FIG. [Figure 4] 1 is a right side view showing two first embodiments of the retaining wall blocks of the present invention combined together. FIG. [Diagram 5] 1 is another right side view showing two of the first embodiment of the retaining wall blocks of the present invention combined together. FIG. [Figure 6] This is a right side view showing a set of two first embodiments of the retaining wall blocks of the present invention, three of which are stacked vertically and installed against a slope of the ground. [Figure 7] 1 is a perspective view showing a second embodiment of a retaining wall block of the present invention. [Figure 8] A right side view showing two second embodiments of the retaining wall blocks of the present invention combined together. [Figure 9] A right side view showing a third embodiment of the retaining wall block of the present invention. [Figure 10] A right side view showing a fourth embodiment of the retaining wall block of the present invention. [Figure 11] A right side view showing the fifth embodiment of the retaining wall block of the present invention. [Figure 12] 13 is a perspective view showing a sixth embodiment of the retaining wall block of the present invention. FIG. [Figure 13] 13 is a perspective view showing a seventh embodiment of the retaining wall block of the present invention. FIG. [Figure 14] 13 is a perspective view showing an eighth embodiment of the retaining wall block of the present invention. FIG. [Figure 15] An oblique view showing a ninth embodiment of the retaining wall block of the present invention. [Figure 16] An oblique view showing a tenth embodiment of the retaining wall block of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiment of the retaining wall block according to the present invention will be described in detail. The embodiment described below is a preferred embodiment for carrying out the present invention, and therefore various technical limitations are imposed thereon. However, the present invention is not limited to this embodiment unless otherwise specified in the following description to limit the invention. The vertical direction of the retaining wall block B is the vertical direction in FIG. 2 in the first embodiment, the front direction, front side, and front side, which are the road side and the housing land side, are the left side in FIG. 2, the rear direction, back side, and back side, which are the slope side of the ground G, are the right side in FIG. 2, and the width direction and left-right direction of the retaining wall block B are the front-back direction in FIG. 2. The vertical direction, front-back direction, and left-right direction of the second to tenth embodiments also correspond to FIG. 2 in the same way as in the first embodiment.

[0016] The retaining wall block B of the present invention comprises a surface wall portion 1 and a buttress portion 2. The two retaining wall blocks B can be used as a set, so that the set of retaining wall blocks B can be used as a box-shaped block as in Patent Document 1, and the length of the surface wall portion 1 along the approximately vertical direction can be adjusted and changed.

[0017] First Embodiment As shown in Fig. 1 and Fig. 2, the retaining wall block B has a plate-shaped front wall 1 having a surface exposed to the outside such as the road side or the housing site side, and a plate-shaped buttress 2 protruding from the back surface 1a of the front wall 1 in a substantially parallel manner and having a height lower than the vertical height of the front wall 1 during use. As shown in Fig. 2 and other figures, the height H2 of the buttress 2 is preferably substantially half the vertical height H1 of the front wall 1, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. The retaining wall block B is preferably made of a material having a specific gravity of more than 1, such as concrete made by mixing and molding sand, gravel, cement, water, etc., mortar made by mixing and molding sand, cement, water, etc., or iron, and concrete or mortar is more preferable from the viewpoints of ease of transportation and long-term stability such as being less likely to deteriorate even when exposed to wind and rain.

[0018] When the retaining wall blocks B are installed, the surface wall 1 is exposed on the flat land side such as a road or a residential area. The surface wall 1 may be provided with a pattern or the like to enhance the design. In addition, the upper and lower surfaces of the surface wall 1 are provided with engagement holes 11, and when multiple retaining wall blocks B are arranged vertically, a rod-shaped member can be engaged with the engagement hole 11 on the lower surface side of the upper retaining wall block B and the engagement hole 11 on the upper surface side of the lower retaining wall block B, thereby preventing the multiple retaining wall blocks B from shifting or falling. Furthermore, the lower surface side of the surface wall 1 can be provided with an engagement hole 11, and an engagement protrusion such as a trapezoidal shape that can be engaged with the engagement hole 11 can be provided on the upper surface side, so that when multiple retaining wall blocks B are stacked vertically, the engagement hole and the engagement protrusion can be engaged with each other to prevent the multiple retaining wall blocks B from shifting or falling. In addition, the surface wall 1 is provided with a connection hole 12 that penetrates in the left-right direction. When multiple retaining wall blocks B are arranged side by side, a rod-shaped member can be inserted into the joint holes 12 of adjacent retaining wall blocks B to engage them, or a metal wire can be inserted into the insertion holes 23 of adjacent retaining wall blocks B to prevent the multiple retaining wall blocks B from shifting position or falling. As shown in Figures 3 to 5, when one retaining wall block B and another retaining wall block B are prepared as a set and the other retaining wall block B is turned upside down relative to the first retaining wall block B to engage the recessed portion 21 in the buttress portion 2 of the first retaining wall block B with the protruding portion 22 in the buttress portion 2 of the other retaining wall block B, the surface wall portion 1 of the first retaining wall block B is exposed on the flat ground side such as a road or a housing site, but the surface wall portion 1 of the other retaining wall block B faces the slope side of the ground G and is not exposed on the flat ground side such as a road or a housing site.

[0019] Two buttress sections 2 protrude from the back surface 1a, which is opposite the front surface, at the lower part of the front wall section 1, in a generally parallel relationship with the longitudinal direction being the front-to-rear direction. In this embodiment, the buttress section 2 has a generally elongated rectangular parallelepiped shape. Also, in this embodiment, two buttress sections 2 protrude from the front wall section 1, but in other embodiments, one or three or more buttress sections 2 can be provided protruding from the front wall section 1 depending on the length in the width direction of the retaining wall block B, and a beam section connecting the two buttress sections 2 can also be provided along the width direction of the retaining wall block B.

[0020] Then, on the upper surface 2a, which is the upper surface of the buttress portion 2 when in use, recesses 21 and protrusions 22, which are shaped to be engageable with each other, are provided along the longitudinal direction of the buttress portion 2. Specifically, as shown in Figures 1 and 2, one of the two buttress portions 2 has three truncated quadrangular pyramid recesses 21 and three truncated quadrangular prism protrusions 22 alternately and at approximately equal intervals on the upper surface 2a of the buttress portion 2 from the rear surface 1a of the front wall portion 1. Furthermore, the other of the two buttress portions 2 has three truncated quadrangular prism protrusions 22 and three truncated quadrangular pyramid recesses 21 alternately and at approximately equal intervals on the upper surface 2a of the buttress portion 2 from the rear surface 1a of the front wall portion 1. By providing the recessed portion 21 and the protruding portion 22 in this way, as shown in FIG. 3, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is turned upside down with respect to the first retaining wall block B, and the recessed portion 21 in the buttress portion 2 of the first retaining wall block B is engaged with the protruding portion 22 in the buttress portion 2 of the other retaining wall block B, so that the set of retaining wall blocks B can be used as one box-shaped retaining wall block. Furthermore, as shown in FIG. 4 and FIG. 5, the length of the set of retaining wall blocks B can be adjusted and changed in three stages in the front-rear direction of the buttress portion 2. In the set of retaining wall blocks B, mortar, concrete, etc. are poured into the space surrounded by the two surface wall portions 1 and the two buttress portions 2 engaged with each other, so that the strength of the retaining wall blocks B can be increased. In this embodiment, three recessed portions 21 and three protruding portions 22 are provided, but in other embodiments, two or four or more of each can be provided. The recesses 21 and the protrusions 22 are formed on the inside, which is the side closer to the other buttresses 2, in the width direction, which is the left-right direction, of the upper surface 2a of one buttress portion 2, and are not formed on the outside, which is the side farther from the other buttresses 2. Specifically, the recesses 21 and the protrusions 22 are provided in a range of 80 to 90% in the inner direction, in the width direction, which is the left-right direction, of the upper surface 2a of one buttress portion 2, and are not provided in 10 to 20% in the outer direction.In this way, by having portions where the depression 21 and the protrusion 22 are not provided on the outside of the upper surface 2a, as shown in Figures 4 and 5, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is inverted upside down relative to the first retaining wall block B, and the depression 21 in the buttress portion 2 of the first retaining wall block B is engaged with the protrusion 22 in the buttress portion 2 of the other retaining wall block B. When mortar or the like is then injected into the cavity on the inside, even if a small amount of mortar or the like leaks out from the engaged depression 21 and protrusion 22, it remains on the upper surface 2a of the buttress portion 2 and does not flow down the side of the buttress portion 2, so as to prevent the appearance from being marred. In this embodiment, the recess 21 and the protrusion 22 have a square prism shape, but in other embodiments, they may be truncated cones, pyramids, cones, prisms, cylinders, approximately semi-cylindrical, or approximately hemispherical, as long as they are uneven and can engage with each other. The approximately semi-cylindrical shape is a shape obtained by cutting a cylinder with a plane along the central axis or an axis in the vicinity thereof, and the approximately hemispherical shape is a shape obtained by cutting a sphere with a plane passing through the center or a point in the vicinity thereof. In this embodiment, the recess 21 is provided so as to open to the upper surface 2a of the buttress 2 and the inside of the wall 2, but in other embodiments, they may be provided as holes that open only on the upper surface 2a of the buttress 2 and do not open on other surfaces, as long as they are uneven and can engage with each other. In other embodiments, the lower surface 2b, which is the lower surface of the retaining wall portion 2, or both the upper surface 2a and the lower surface 2b, may have a recess 21 and a protrusion 22, which are shaped to be engageable with each other, along the longitudinal direction of the retaining wall portion 2.When one retaining wall block B and another retaining wall block B are prepared as a set and the sets are stacked one on top of the other, the front-to-rear length of each set of retaining wall blocks B can be adjusted and changed.

[0021] Furthermore, an insertion hole 23 is drilled in each buttress portion 2, penetrating in the left-right direction. When a plurality of retaining-wall blocks B are arranged on the left and right, a rod-shaped member is inserted into the insertion holes 23 of adjacent retaining-wall blocks B to engage with each other, or a metal wire is inserted into the insertion holes 23 of adjacent retaining-wall blocks B to prevent the plurality of retaining-wall blocks B from shifting positions or falling. Alternatively, as shown in FIG. 6, when the panel P1 is arranged, the panel P1 can be fixed via a bolt Bo. In this embodiment, the insertion hole 23 penetrates the buttress portion 2 in the left-right direction, but in other embodiments, the insertion hole 23 may be a recess that does not penetrate as long as a rod-shaped member can be engaged with the insertion holes 23 of adjacent retaining-wall blocks B.

[0022] In addition, adjacent retaining wall blocks B are arranged on the left and right of each retaining wall block B, and a retaining wall of a predetermined size according to the slope of the ground G is constructed by installing multiple retaining wall blocks B in the left and right directions and the up and down directions. At this time, even if the slope of the soil is partially protruding or recessed, the length in the front and back directions can be adjusted by using two retaining wall blocks B as a set, so that the surface wall 1 of multiple retaining wall blocks B can be easily formed as approximately one flat surface. In addition, by using two retaining wall blocks B as a set, the length in the front and back directions can be adjusted at the work site, so there is no need to prepare multiple types of retaining wall blocks B having buttress parts 2 with different lengths, and therefore management of the retaining wall blocks B is also easy. For example, as shown in FIG. 6, a huge retaining wall can be formed by using two retaining wall blocks B as a set and stacking multiple sets, such as three sets, one above the other, against the slope of the ground G. As a method of forming the retaining wall, first, as shown in Fig. 6, when a gap occurs between the back surface 1a of the front wall portion 1 of one retaining wall block B and the end of the buttress portion 2 of another retaining wall block B, a plate-shaped panel P1 made of concrete, metal, wood, or the like is arranged to fill the gap, and the panel P1 is fixed by fastening a bolt Bo into the insertion hole 23. At this time, in order to reinforce the panel P1, an L-shaped angle or the like may be arranged in the front-rear direction along the panel P1, and the panel P1 and the angle may be fixed by fastening a bolt Bo into the insertion hole 23. Then, mortar or concrete is poured into the space surrounded by the front wall portion 1, the buttress portion 2, and the panel P1 to form a huge retaining wall. In addition, in the other retaining wall block B located above, where two retaining wall blocks B are used as a set, a plate-shaped panel P2 made of concrete, metal, wood, etc. is arranged to fill the gap between the surface wall portion 1 and the slope of the ground G, and the panel P2 is fixed by fastening the bolts Bo in the connecting holes 12, and the space surrounded by the surface wall portion 1, the slope of the ground G and the panel P2 is filled with crushed stone ST or the like to complete the structure.

[0023] Second Embodiment As shown in FIG. 7, the retaining wall block B is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a on the lower part of the front wall portion 1, which is opposite to the front surface, in a manner substantially parallel to each other so that the front-rear direction is the short side direction, as in the first embodiment. Similarly to the first embodiment, two recesses 21 and two protrusions 22 each having a square pyramid shape are provided on the upper surface 2a of the buttress portion 2, which are alternately provided at substantially equal intervals. Unlike the first embodiment, this embodiment is provided with a rear end portion 3 having a substantially square column shape that connects the two buttress portions 2 at the rear end side of the two buttress portions 2. The rear end portion 3 can suppress vertical vibrations, particularly at the rear end side, of the two buttress portions 2 during transportation, and can prevent the buttress portion 2 from breaking from the front wall portion 1. The material of the rear end portion 3 is preferably concrete, like the front wall portion 1 and the two buttress portions 2, but unlike the front wall portion 1 and the two buttress portions 2, it can also be arranged at the end of the buttress portion 2 using a steel material. Similarly to the first embodiment, the height of the buttress wall portion 2 is preferably approximately half the height of the front wall portion 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. In this embodiment, the rear end portion 3 is approximately quadrangular prism-shaped, but in other embodiments, it may be a prismatic prism such as a triangular prism or a hexagonal prism, or a cylindrical shape. Furthermore, in this embodiment, the rear end portion 3 is one piece, but in other embodiments, it may be a plurality of pieces such as two or three pieces.

[0024] And, because the recessed portion 21 and the protrusion portion 22 are provided in this manner, as shown in Fig. 8, one retaining wall block B and another retaining wall block B can be prepared as a set, the other retaining wall block B can be turned upside down relative to the first retaining wall block B, and the recessed portion 21 in the buttress portion 2 of the first retaining wall block B can be engaged with the protrusion portion 22 in the buttress portion 2 of the other retaining wall block B, thereby allowing them to be used as a single box-shaped retaining wall block. Furthermore, as shown in Fig. 8, the length of the set of retaining wall blocks B can be changed by adjusting the buttress portion 2 in two stages in the front-to-rear direction. In addition, although not shown, as shown in Figure 8, when two retaining wall blocks B are paired together, if the number of engagements between the recessed portions 21 in the buttress portion 2 of one retaining wall block B and the protrusions 22 in the buttress portion 2 of the other retaining wall block B is small, the pair may become unstable. Therefore, by providing an additional elongated bolt that penetrates the buttress portion 2 of the first retaining wall block B and the buttress portion 2 of the other retaining wall block B, the first retaining wall block B and the other retaining wall block B that are stacked can be firmly fixed together.

[0025] Third Embodiment As shown in Fig. 9, similarly to the first embodiment, the retaining wall block B is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a opposite to the front surface at the lower part of the front wall portion 1 in a substantially parallel manner so that the longitudinal direction is the front-to-rear direction. Unlike the first embodiment, as shown in Fig. 9, the ridgeline of the upper surface 2a of the buttress portion 2 is smoothly continuous and periodic curved like a sine curve, cosine curve, or circular arc in side view, so that five each of gentle, periodic curved recesses 21 and protrusions 22 are provided alternately and at substantially equal intervals on the upper surface 2a of the buttress portion 2. In this embodiment, unlike the first embodiment, the recessed portion 21 and the protruding portion 22 are gently curved, so that one retaining wall block B and another retaining wall block B are prepared as a set, the other retaining wall block B is turned upside down with respect to the first retaining wall block B, and the recessed portion 21 in the buttress portion 2 of the first retaining wall block B is engaged with the protruding portion 22 in the buttress portion 2 of the other retaining wall block B, so that the retaining wall block can be used as one box-shaped retaining wall block. As in the first embodiment, the height of the buttress portion 2, which is the average height of the periodic curved recessed portions 21 and the protruding portions 22, is preferably approximately half the height of the front wall portion 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, as in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of a set of retaining wall blocks B can be adjusted and changed in five steps in the front-rear direction of the buttress portion 2.

[0026] Fourth Embodiment As shown in Fig. 10, similarly to the first embodiment, the retaining wall block B is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a opposite to the front surface at the lower part of the front wall portion 1 in a substantially parallel manner so that the longitudinal direction is the front-to-rear direction. Unlike the first embodiment, as shown in Fig. 10, in side view, the ridgeline of the upper surface 2a of the buttress portion 2 is a zigzag-like straight line with a periodic shape, so that five isosceles triangular wavy recesses 21 and five protrusions 22 are provided alternately and substantially equally spaced on the upper surface 2a of the buttress portion 2. In this embodiment, unlike the first embodiment, the recessed portion 21 and the protruding portion 22 are corrugated in an isosceles triangle shape. Therefore, a pair of one retaining wall block B and another retaining wall block B are prepared, and the other retaining wall block B is turned upside down with respect to the first retaining wall block B, and the recessed portion 21 in the buttress portion 2 of the first retaining wall block B is engaged with the protruding portion 22 in the buttress portion 2 of the other retaining wall block B, so that the pair of retaining wall blocks B can be used as one box-shaped retaining wall block. As in the first embodiment, the height of the buttress portion 2, which is the average height of the periodic triangular recessed portions 21 and the protruding portions 22, is preferably approximately half the height of the front wall portion 1 in the vertical direction, more specifically, preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, as in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of a pair of retaining wall blocks B can be adjusted and changed in five steps in the front-rear direction of the buttress portion 2. In this embodiment, the recess 21 and the protrusion 22 are wavy and have an isosceles triangle shape when viewed from the side, as shown in FIG. 9, but in other embodiments, as long as the opposing recess 21 and protrusion 22 can engage with each other, they can also have a right-angled triangle shape or a square shape when viewed from the side.

[0027] Fifth Embodiment As shown in FIG. 11, the retaining wall block B has a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a opposite to the front surface at the upper part of the front wall portion 1 in a substantially parallel manner so that the front-rear direction is the longitudinal direction, in the same manner as in the first embodiment. Different from the first embodiment, three recesses 21 and three protrusions 22 each having a quadrangular pyramid shape are provided alternately and substantially equally spaced on the lower surface 2b of the two buttress portions 2 in this embodiment, different from the first embodiment, in which the recesses 21 and the protrusions 22 are provided on the lower surface 2b of the two buttress portions 2, but one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is turned upside down relative to the one retaining wall block B, and the recesses 21 in the buttress portion 2 of the one retaining wall block B are engaged with the protrusions 22 in the buttress portion 2 of the other retaining wall block B, so that the retaining wall block B can be used as one box-shaped retaining wall block as in the first embodiment. As in the first embodiment, the height of the buttress wall 2 is preferably approximately half the height of the front wall 1 in the vertical direction, more specifically, it is preferably 40-60%, and most preferably 45-55%. As in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of a set of retaining wall blocks B can be adjusted in three stages in the front-rear direction of the buttress wall 2. In this embodiment, the recess 21 and the protrusion 22 are provided on the lower surface 2b of the buttress wall 2, but in other embodiments, they can be provided on both the upper surface 2a and the lower surface 2b of the buttress wall 2 protruding from the back surface 1a of the middle part of the front wall 1 in the vertical direction.

[0028] Sixth Embodiment 12, the retaining wall block B, like the first embodiment, is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a opposite to the front surface at the lower part of the front wall portion 1 in a substantially parallel manner so that the longitudinal direction is the front-rear direction. Unlike the first embodiment, five rectangular prism-shaped recesses 21 and one rectangular prism-shaped protrusion 22 are provided at substantially equal intervals on the upper surface 2a of each of the two buttress portions 2. That is, of the five recesses 21 and one protrusion 22, one protrusion 22 is located at the rearmost side, and the five recesses 21 are located between the protrusion 22 and the front wall portion 1. In this embodiment, unlike the first embodiment, five recesses 21 and one protrusion 22 are provided on the upper surface 2a of the two buttress parts 2. Therefore, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is turned upside down with respect to the first retaining wall block B, and the recesses 21 in the buttress part 2 of the one retaining wall block B are engaged with the protrusions 22 in the buttress part 2 of the other retaining wall block B, so that the retaining wall blocks can be used as one box-shaped retaining wall block as in the first embodiment. As in the first embodiment, the height of the buttress part 2 is preferably approximately half the height of the front wall part 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, as in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of the set of retaining wall blocks B can be adjusted in five steps in the front-rear direction of the buttress part 2. In this embodiment, the recesses 21 and the protrusions 22 are provided at approximately equal intervals, but since there is only one protrusion 22, in other embodiments, the intervals between one recess 21 and another recess 21 and the intervals between one recess 21 and the protrusion 22 may be unequal. Also, in this embodiment, of the five recesses 21 and one protrusion 22, one protrusion 22 is located at the rearmost side, but in other embodiments, one protrusion 22 does not necessarily have to be located at the rearmost side, such as second from the rearmost side.

[0029] Seventh Embodiment 13, the retaining wall block B, like the first embodiment, is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from the back surface 1a, which is the opposite side to the front surface at the lower part of the front wall portion 1, approximately parallel to each other so that the longitudinal direction is the front-to-rear direction. Unlike the first embodiment, five truncated cone-shaped depressions 21 and five truncated cone-shaped protrusions 22 are provided adjacent to each other on the upper surface 2a of each of the two buttress portions 2. In other words, one depression 21 and one protrusion 22 are provided adjacent to each other as a set, and five sets are provided. In this embodiment, unlike the first embodiment, five sets of adjacent recesses 21 and protrusions 22 are provided on the upper surfaces 2a of the two buttress parts 2. Therefore, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is turned upside down with respect to the first retaining wall block B to more firmly engage the recesses 21 in the buttress part 2 of the one retaining wall block B with the protrusions 22 in the buttress part 2 of the other retaining wall block B. As in the first embodiment, the height of the buttress part 2 is preferably approximately half the height of the front wall part 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, as in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of a set of retaining wall blocks B can be adjusted in five steps in the front-rear direction of the buttress part 2. In this embodiment, a pair of recesses 21 and protrusions 22 are provided adjacent to each other at a predetermined interval, but in other embodiments, the interval between the pair of recesses 21 and protrusions 22 can be changed, and the number of recesses 21 and protrusions 22 can be changed.

[0030] Eighth embodiment As shown in FIG. 14, the retaining wall block B is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from the back surface 1a of the lower part of the front wall portion 1, which is opposite to the front surface, in a manner that the longitudinal direction is approximately parallel to the front-rear direction, in the same manner as in the first embodiment. Unlike the first embodiment, five truncated cone-shaped recesses 21 are provided at approximately equal intervals on the upper surface 2a of each of the two buttress portions 2, and at least one engagement pin 4 is provided on the upper surface 2a of each of the two buttress portions 2, which is detachably engageable with the recesses 21 and has a shape like two truncated cones joined at their bottom surfaces. That is, by engaging the engagement pin 4 with at least one of the five recesses 21, a part of the engagement pin 4 exposed from the upper surface 2a of the wall portion 2 is formed as a protrusion 22. In this way, the protrusion 22 does not need to be formed integrally with the buttress portion 2 as in the other first to seventh embodiments, and can be provided as a separate member from the buttress portion 2 as in this embodiment. In this embodiment, unlike the first embodiment, five recesses 21 and one engagement pin 4 are provided on the upper surface 2a of the two buttress parts 2. Therefore, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is turned upside down with respect to the first retaining wall block B. The protrusion 22 formed by engaging the engagement pin 4 with the recess 21 in the buttress part 2 of the first retaining wall block B is engaged with the recess 21 in the buttress part 2 of the other retaining wall block B, so that the retaining wall block can be used as one box-shaped retaining wall block as in the first embodiment. As in the first embodiment, the height of the buttress part 2 is preferably approximately half the height of the front wall part 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, as in Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of the set of retaining wall blocks B can be adjusted in five steps in the front-rear direction of the buttress part 2. In this embodiment, five recesses 21 are provided, but in other embodiments, a number other than five may be provided.

[0031] Ninth embodiment As shown in Fig. 15, the retaining wall block B is provided with a front wall 1 having a surface exposed to the outside, and two buttresses 2 protruding from the back surface 1a of the lower part of the front wall 1, which is opposite to the front surface, in a manner substantially parallel to the longitudinal direction. Similarly to the first embodiment, 20 square pyramid-shaped protrusions 22 are provided at a predetermined interval on the upper surface 2a of the buttress 2, and 20 recesses 21 are formed as gaps between the protrusions 22 and between the back surface 1a of the front wall 1 and the protrusions 22 closest to the back surface 1a, which are relatively recessed. Similarly to the first embodiment, the height H2 of the buttress 2 is preferably approximately half the height H1 of the front wall 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. The recesses 21 and the protrusions 22 are formed on the inside, which is the side closer to the other buttresses 2, in the width direction, which is the left-right direction, of the upper surface 2a of one buttress portion 2, and are not formed on the outside, which is the side farther from the other buttresses 2. Specifically, the recesses 21 and the protrusions 22 are provided in a range of 80 to 90% in the inner direction, in the width direction, which is the left-right direction, of the upper surface 2a of one buttress portion 2, and are not provided in 10 to 20% in the outer direction. In this way, by having portions where the depression 21 and the protrusion 22 are not provided on the outside of the upper surface 2a, as in Figures 4 and 5, one retaining wall block B and another retaining wall block B are prepared as a set, and the other retaining wall block B is inverted upside down relative to the first retaining wall block B, so that the depression 21 in the buttress portion 2 of the first retaining wall block B engages with the protrusion 22 in the buttress portion 2 of the other retaining wall block B. When mortar or the like is then injected into the cavity on the inside, even if a small amount of mortar or the like leaks out from the engaged depression 21 and protrusion 22, it remains on the upper surface 2a of the buttress portion 2 and does not flow down the side of the buttress portion 2, so as to prevent the appearance from being marred.

[0032] 3 and 4, by preparing one retaining wall block B and another retaining wall block B as a set, inverting the other retaining wall block B upside down with respect to the first retaining wall block B, and engaging the recessed portion 21 in the buttress portion 2 of the first retaining wall block B with the protrusion 22 in the buttress portion 2 of the other retaining wall block B, they can be used as one box-shaped retaining wall block. Furthermore, as in Figures 4 and 5, the length of the set of retaining wall blocks B can be changed by adjusting the buttress portion 2 by several stories in the front-to-back direction. 4 and 5, when two retaining wall blocks B are combined into a set, if the number of recesses 21 in the buttress portion 2 of one retaining wall block B and the number of projections 22 in the buttress portion 2 of the other retaining wall block B engaged are small, the set may become unstable, so that the stacked one retaining wall block B and the other retaining wall block B can be firmly fixed by providing an additional elongated bolt penetrating the buttress portion 2 of the stacked one retaining wall block B and the buttress portion 2 of the other retaining wall block B. In this embodiment, the recesses 21 and the projections 22 have a square prism shape, but in other embodiments, they may be truncated cones, pyramids, cones, square columns, cylinders, approximately semi-cylindrical, or approximately hemispherical, as long as they are uneven and can be engaged with each other.

[0033] Tenth embodiment As shown in FIG. 16, the retaining wall block B is provided with a front wall portion 1 having a surface exposed to the outside, and two buttress portions 2 protruding from a back surface 1a on the opposite side to the front surface at the lower part of the front wall portion 1 in a substantially parallel manner so that the front-rear direction is the longitudinal direction, and the like, in the same manner as in the first embodiment. Unlike the first embodiment, the recessed portion 21 and the protruding portion 22 are not formed on either the upper surface 2a or the lower surface 2b of the two buttress portions 2. In this embodiment, unlike the first to eighth embodiments, the recessed portion 21 and the protruding portion 22 are not formed on either the upper surface 2a or the lower surface 2b of the two buttress portions 2, in the same manner as in the first embodiment, by preparing one retaining wall block B and another retaining wall block B as a set, and by inverting the other retaining wall block B upside down with respect to the one retaining wall block B, and by abutting the upper surfaces 2a of the buttress portions 2 of the one retaining wall block B against each other, the retaining wall block B can be used as one box-shaped retaining wall block as in the first embodiment. Although not as strong as the engagement force between the recessed portion 21 and the protruding portion 22 as shown in the first to eighth embodiments, in the retaining wall blocks B of this embodiment, the frictional force between the upper surfaces 2a makes it difficult for the pair of retaining wall blocks B to shift position. As in the first embodiment, the height of the buttress portion 2 is preferably approximately half the height of the front wall portion 1 in the vertical direction, more specifically, it is preferably 40 to 60%, and most preferably 45 to 55%. Furthermore, unlike Figs. 4 and 5 of the first embodiment and Fig. 7 of the second embodiment, the length of the pair of retaining wall blocks B can be changed by continuously adjusting it in infinite steps in the front-rear direction of the buttress portion 2. [Explanation of symbols]

[0034] 1...Surface wall 1a Back 11 Engagement hole 12. Connecting hole 2. Retaining wall 2a...Top surface 2b...Bottom surface 21. Recess 22...Protrusion 23 Insertion hole 3...Rear end 4···Engagement pin B···Retaining wall blocks P1, P2... Panel ST···Crushed Stone G···Ground

Claims

1. A surface wall portion (1) having a surface exposed to the outside; A retaining wall block is characterized in that it has a buttress portion (2) protruding from the back surface (1a) of the surface wall portion (1) opposite the surface, and having a height lower than the vertical height of the surface wall portion (1) when in use.

2. A retaining wall block as described in claim 1, characterized in that at least one of the upper surface (2a) or the lower surface (2b) of the retaining wall portion (2) when in use has a recess portion (21) and a protrusion portion (22) having shapes that can engage with each other along the longitudinal direction of the retaining wall portion (2).

3. A configuration in which a plurality of the recessed portions (21) and a plurality of the protruding portions (22) are provided; A retaining wall block according to claim 2, characterized in that the block has either one of the above-mentioned configurations, or a plurality of the recesses (21) and one protrusion (22).

4. A retaining wall block as described in claim 2, characterized in that a plurality of the recesses (21) are provided, and at least one separate engagement pin (4) capable of engaging with the recesses (21) engages with the recesses (21) to form the protrusion (22).

5. A retaining wall block as described in any one of claims 2 to 4, characterized in that the recess portion (21) and the protrusion portion (22) are one of the following shapes: truncated pyramid shape, truncated cone shape, pyramidal shape, conical shape, rectangular column shape, cylindrical shape, approximately semi-cylindrical shape, or approximately hemispherical shape.

6. A retaining wall block as described in claim 2, characterized in that the ridge line of at least one of the upper surface (2a) or lower surface (2b) of the recessed portion (21) and the protrusion portion (22) in a side view is one of a periodic curved shape, a periodic triangular shape, or a periodic rectangular shape.

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