JP7033320B2 - Construction method of concrete products and retaining walls - Google Patents

Description

The present invention relates to a concrete product used as a retaining wall and a construction method thereof.

Patent Document 1 has a corner block of an L-shaped retaining wall that can be easily installed at a construction site in the construction of a residential land and a park, and a construction method thereof. An L-shaped corner block, the joint portion of a pair of one block and the other block, in which the facing surface of the bottom slab is formed diagonally and a joint portion having a through hole in the center is provided at one end of the vertical wall. It is disclosed that the hinge structure is formed by axially attaching the above with a shaft rod.

Japanese Unexamined Patent Publication No. 9-296461

This hinged corner block is convenient for adjusting the angle of the corner portion. On the other hand, since the top of the corner is composed of the joints separated into upper and lower parts, the axis of the joint attached to the blocks arranged on the left and right of the corner is slightly deviated to the ridgeline of the top of the corner. In the vertical direction, unevenness is likely to occur due to a slight deviation of the axial center of the upper and lower joints. In particular, if the axis of the upper joint is slightly displaced outward from the axis of the lower joint, it is easy to give the impression that the upper joint protrudes outward from the lower joint, and the retaining wall Even if there is no problem in terms of structure, it may cause a feeling of instability in appearance. In addition, even if the ridgelines can be aligned during construction with a great deal of effort, a slight shift may occur at the top and bottom of the joint due to some factor after construction, and the same phenomenon occurs in that case as well. obtain. Further, since the ridgeline is conspicuous in the corner portion, there is a problem that even a slight deviation can be easily grasped by appearance.

One aspect of the present invention is a concrete product for constructing a corner portion of a retaining wall, which is arranged adjacent to a first wall body made of concrete and the left or right side of the first wall body. It has a second wall body made of concrete, and the first wall body includes a first truncated cone-shaped connection portion on the lower side adjacent to the second wall body. The second wall body is connected coaxially to the first connection portion on the upper side on the side adjacent to the first wall body, and forms a continuous cone shape on the upper part of the first cone shape. Includes a second cone-shaped connection.

A truncated cone-shaped second connecting portion is included, and the second wall body is coaxially connected to the first connecting portion in the upper half portion on the side adjacent to the first wall body. Including the connection part of. The second wall may include a third truncated cone-like third connection that is coaxially connected to the first connection and forms a continuous truncated cone shape at the bottom of the first truncated cone. good. The first wall may include a first connection in the upper half and the second wall may include a second connection in the lower half.

In this concrete product, when the corner portion is constructed with the first wall body and the second wall body, the second connecting portion and the first connecting portion are joined up and down, and the lower part is as a whole with respect to the upper part. Wide truncated cone-shaped corners are formed, and the ridges that appear up and down on the outside of the corners are such that the lower side spreads outward, and the appearance is shaped to give a stable impression. The second connection, which is above the first connection, gives a small impression to the first connection, and during or after construction, by any chance, the second connection and the first connection. Even if the side of the second connection portion is slightly displaced outward at the boundary portion with the connection portion, it is easy to give the impression that the second connection portion is contained on the first connection portion, and the structure is unstable. It is possible to suppress the occurrence of a feeling. Further, even when the second connecting portion is displaced outward with respect to the first connecting portion, the ridgeline (outer peripheral surface) of the first connecting portion extends outward in a truncated cone shape. It is easy to fill the gap of the second connecting portion with a mortar or the like based on the outer peripheral surface, and it is possible to construct a corner portion having a ridgeline in which unevenness is inconspicuous.

Further, it is possible to form the outer wall surface of the first wall body and the second wall body so as to be connected to the first connection part and the second connection part, and the first wall body and the second wall body can be formed. It is possible to provide an inclination in which the lower side extends outward and the upper side recedes with respect to the upper side of the outer wall surface of the body. Therefore, by using this concrete product, it is possible to construct and provide a retaining wall that gives an impression of excellent stability with less oppressive feeling when the retaining wall is viewed from the outside as a whole.

Therefore, the first wall body and at least one wall body of the second wall body may include an outer wall surface having a slope common to the slope of the outer peripheral surface of the first connection portion and the second connection portion. The outer wall surface of the first wall body and the second wall body may be continuously connected to the outer surface of the first connection portion and the second connection portion without unevenness, and further, the corner portion having an excellent appearance beauty. Can provide a retaining wall with.

It may include a hole extending along the central axis of the first connection of the first wall and the second connection of the second wall. This hole extends in the vertical direction, and by inserting a bar or the like, it can be connected so as to be relatively rotatable around it, and the first wall body and the second wall body have a vertical posture with respect to the ground plane. While maintaining, it is easy to change the angle formed by the first wall body and the second wall body, and the construction of the corner portion of the retaining wall becomes easier. Further, the first connection portion and the second connection portion can be fixed by injecting mortar or the like into this hole.

The upper part of the end face on the adjacent side of the first wall may include a surface having a slope common to the slope of the outer surface of the second connection. Further, the lower portion of the adjacent end surface of the second wall may include a surface having a slope common to the slope of the outer surface of the first connection. The gap between the upper part of the end face on the adjacent side of the first wall body and the outer surface of the second connection part, and the gap between the lower part of the end face on the adjacent side of the second wall body and the outer surface of the first connection part. Can be made smaller. In addition, when constructing a retaining wall, if these gaps are filled with mortar or the like, the labor of construction can be reduced.

The inner wall surface of the first wall body and the second wall body may be inclined so that the upper wall thickness is reduced. It is possible to provide a block (concrete product) for a retaining wall having a slope on an outer wall surface and an inner wall surface, which can change the angle on site according to the angle of a corner.

One of the different other forms of the present invention is a method of constructing a corner portion of a retaining wall using a first wall body and a second wall body. If the upper part of the end face on the adjacent side of the first wall includes a surface having a slope common to the slope of the outer surface of the second connection, the first wall and the second wall are perpendicular to each other. It is difficult to combine just by the movement of. Therefore, the construction method includes a step of horizontally moving and combining at least one of the first connection portion of the first wall body and the second connection portion of the second wall body.

Further, the second wall body has a hole that penetrates up and down along the central axis of the second connecting portion, and in the construction method, the connecting shaft is inserted into the hole, and the first connecting portion and the first connecting portion are formed. It may include a step of adjusting the angle by relatively rotating the connection portion of 2.

It is a perspective view which looked at the corner block of one Embodiment of this invention from the front (front). It is a perspective view which looked at the corner block from the rear (rear). It is a perspective view which looked at each of the 1st block and the 2nd block from the outside (front). It is a perspective view which looked at each of the 1st block and the 2nd block from the inside (back side). It is the figure which looked at the 1st block and the 2nd block from the front. It is a side view of the 1st block and the 2nd block. It is a top view of the 1st block and the 2nd block. It is the bottom view of the 1st block and the 2nd block. The state of constructing the retaining wall using the corner block is shown, (a) shows the state of constructing the retaining wall with the corner of 70 degrees, and (b) shows the state of constructing the retaining wall with the corner of 90 degrees. The state is shown, and (c) is a figure which shows the state of constructing a retaining wall having a corner of 110 degrees. It is a figure explaining the process of assembling a corner block. It is a figure which shows a different example of a corner block. It is a figure which shows a further different example of a corner block.

1 and 2 show an example of a concrete product. This concrete product is a corner block 5 for constructing a corner portion 2 of a concrete retaining wall 1, and is arranged adjacent to a first block 10 made of concrete and the left or right of the first block 10. It has a second block 20 made of concrete to be made. FIG. 1 is a perspective view of the corner portion 2 as viewed from the outside (front, front) 8. FIG. 2 is a perspective view of the corner portion 2 as viewed from the inside (rear, back) 7, the first block 10 is arranged on the left side of the corner 3 when viewed from the outside 8, and the second block 20 is on the right side. Have been placed. The retaining wall 1 is constructed so as to surround a place where soil retention such as residential land development is required.

3 and 4 show the first block 10 and the second block 20 in a separated state. The first block 10 includes a first wall body 11 constituting the wall surface of the retaining wall 1, and the second block 20 includes a second wall body 21 constituting the wall surface of the retaining wall 1. The wall body 11 and the second wall body 21 are adjacent to each other at a predetermined angle θ, and the corner portion 2 of the retaining wall 1 is constructed. The first wall body 11 has a main body 12 extending in the horizontal direction and a main body 12 on the side (corner side) 4 of the corner 3 of the main body 12, that is, on the lower side of the side 4 adjacent to the second wall body 21. It includes a first cone-shaped connecting portion (connecting portion, joining portion, connecting portion) 13 provided so as to be integrated with the above. The second wall body 21 has a main body 22 extending in the horizontal direction and a main body 22 on the side (corner side) 4 of the corner 3 of the main body 22, that is, on the upper side of the side 4 adjacent to the first wall body 11. It includes a truncated cone-shaped second connecting portion 23 provided to be integrated.

In the blocks 10 and 20 of this example, the first connecting portion 13 is provided so as to form the lower half portion of the corner side 4 of the first wall body 11, and the second connecting portion 23 is provided. It is provided so as to form the upper half of the corner side 4 of the second wall body 21. Therefore, the height h1 of the first connecting portion 13 and the height h2 of the second connecting portion are the same or almost the same, but the height h1 of the first connecting portion 13 is the second connection. The height of the portion may be longer or shorter than h2. The truncated cone-shaped second connecting portion 23 of the second wall body 21 is coaxially connected to the first connecting portion 13 of the first wall body 11 constituting the lower side, and the first connecting portion 13 is connected. A second truncated cone shape is included above the truncated cone shape (first cone shaped) so as to form a continuous truncated cone shape. Therefore, when the second connecting portion 23 is mounted on the first connecting portion 13, a corner 3 having one vertically continuous truncated cone-shaped outer surface 3a is formed.

That is, the upper surface 13b of the truncated cone-shaped first connecting portion 13 of the first block 10 and the lower surface (bottom surface) 23c of the truncated cone-shaped second connecting portion 23 of the second block 20 have the same diameter or It is formed in a circular shape with a radius, and when the connection portion 23 of the second block 20 and the connection portion 13 of the first block 10 are connected up and down to construct the corner portion 2 of the retaining wall 1. The outer surface (outer peripheral surface) 3a of the corner 3 is a part of the shape of a truncated cone having the same slope (slope, tapered surface) in the vertical direction, that is, the first connecting portion 13 and the second connecting portion in the shape of a truncated cone. It is composed of a part of the outer peripheral surface 31 of the corner connecting portion 30 composed of 23. Even if the angle θ formed by the first wall body 11 and the second wall body 21 changes, the outer peripheral surface of the corner connecting portion 30 composed of the first connecting portion 13 and the second connecting portion 23 having a truncated cone shape. The basic shape of 31 does not change, and the outer peripheral surface 3a of the corner 3 has a truncated cone-like surface having the same slope (slope, tapered surface) at the top and bottom.

The gradient (inclination) of the outer peripheral surface 3a having a truncated cone shape that becomes narrower toward the upper side, that is, the outer peripheral surface 31 of the corner connection portion 30, may be about 1 to 5%, and may be about 2 to 4%. May be present, with a typical gradient of 3%. The main body 12 of the first wall body 11 is formed so that the outer surface (outer wall surface) 12a is continuous with the outer peripheral surface 13a of the first connecting portion 13 having a truncated cone shape, and the upper side of the outer surface 12a is the lower side. It is tilted with a gradient 9 similar to that of the outer peripheral surface 13a of the connecting portion 13. The same applies to the second wall body 21, in which the outer surface (outer wall surface) 22a of the main body 22 is formed so as to be continuous with the outer peripheral surface 23a of the second connecting portion 23 having a truncated cone shape, and the outer surface 22a is on the upper surface. The side recedes with respect to the lower side and is tilted with a gradient 9 similar to that of the outer peripheral surface 23a.

When the corner portion 5 of the retaining wall 1 is constructed (manufactured) by the corner block 5 including the first block 10 and the second block 20, the second connecting portion 23 and the first connecting portion 13 are joined up and down. As a whole, a truncated cone-shaped corner joint (corner assembly, corner assembly) 30 having a wide lower portion with respect to the upper portion is configured, and ridge lines appearing up and down on the outer side 8 of the corner portion (outline of the outer peripheral surface 3a of the corner 3). In 3b, the lower side 3d extends to the outer side 8 with respect to the upper side 3c, and the appearance has a shape giving a stable impression. Therefore, the second connection portion 23, which is upper side with respect to the first connection portion 13, gives a small impression to the first connection portion 13, and the second connection should be made during or after construction. Even if the side of the second connecting portion 23 is slightly displaced to the outside 8 at the boundary portion 33 between the portion 23 and the first connecting portion 13, the second connecting portion 23 fits on the first connecting portion 13. It is easy to give the impression that it is, and it is possible to suppress the occurrence of structural instability. Further, even when the second connecting portion 23 is displaced outward 8 with respect to the first connecting portion 13, the (outer peripheral surface) ridge line 3b of the first connecting portion 13 is formed in a truncated cone shape on the outer side 8. Since it is widened, it is easy to fill the gap with the second connecting portion 23 with a mortar or the like based on the outer peripheral surface thereof, and the corner portion 2 having the ridge line 3a in which the unevenness is inconspicuous can be constructed.

Further, the first block 10 and the second block 20 are connected to the first connecting portion 13 and the second connecting portion 23, so that the outer wall surface 12a and the outer wall surface 12a of the first wall body 11 and the second wall body 21 are connected to each other. 22a is formed. Therefore, the outer wall surfaces 12a and 22a of the first wall body 11 and the second wall body 21 also have a shape continuous with the outer peripheral surface 3a of the corner 3, the lower side expands to the outer side 8 with respect to the upper side, and the upper side recedes. The slope is provided. Therefore, by using this corner block (concrete product) 5, the retaining wall 1 including the corner portion 2 as a whole has less oppressive feeling when viewed from the outside 8, and gives an excellent impression of stability. It can be constructed and provided as a wall 1.

The first block 10 and the second block 20 constituting the corner block 5 will be described in more detail with reference to FIGS. 3 to 8. FIG. 3 is a perspective view of a state in which the first block 10 and the second block 20 are separated from the outside (front) 8. FIG. 4 is a perspective view of the first block 10 and the second block 20 as viewed from the inside (rear surface) 7. FIG. 5 is a view of the first block 10 and the second block 20 viewed from the outside (front) 8, and is a diagram showing a state in which the blocks 10 and 20 are linearly combined. FIG. 6A is a side view of the first block 10 as viewed from the left side, and FIG. 6B is a side view of the second block 20 as viewed from the right side. The view seen from the opposite side of each block is basically symmetrical, and the structures of the first connecting portion 13 and the second connecting portion 23 are shown by broken lines. 7 (a) is a plan view of the first block 10, and FIG. 7 (b) is a plan view of the second block 20. 8 (a) is a bottom view of the first block 10, and FIG. 8 (b) is a bottom view of 20 of the second block.

The first block 10 and the second block 20 have a first wall body 11 and a second wall body 21 constituting the wall surface of the retaining wall 1, respectively. The structure (configuration) of the first wall body 11 and the second wall body 21 is common except for the structure of the corner side 4, and the main body 12 and 22 erected from the ground or foundation on which the retaining wall 1 is constructed and the main body. Includes a foundation portion 40 provided below 12 and 22 extending towards the inside 7. The main bodies 12 and 22 and the base portion 40 are configured to form an L-shape, and are formed as an L-shaped block as a whole.

The base portion 40 of the first block 10 and the second block 20 of this example has a concrete bottom plate portion 41 extending horizontally from the lower end edge of the inner side 7 of the main body 12 and 22, and a further inner side 7 from the bottom plate portion 41. Includes a plurality of reinforcing bars 42 extending (protruding) to. The bottom plate portion 41 may have a width and weight that can safely support the blocks 10 and 20 when the blocks 10 and 20 are stored, transported, or temporarily placed at the site, or can control the position of the center of gravity. For example, the width (length) of the bottom plate portion 41 may be about 0.5 to 5 times the width of the bottom surfaces of the main bodies 12 and 22. If the width of the bottom surfaces of the main bodies 12 and 22 is sufficient to temporarily support the blocks 10 and 20, the bottom plate portion 41 may not be provided.

The reinforcing bar 42 protruding inward from the bottom plate portion 41 is used by the blocks 10 and 20 to form a foundation for performing a sufficient function as a retaining wall 1. An important function of the retaining wall 1 is to counter the earth pressure of the inner side 7, and for this purpose it is necessary to provide a foundation of sufficient length in the horizontal direction. On the other hand, in the corner portion 2, the foundations extending from the blocks 10 and 20 may interfere with each other depending on the angle θ formed by the blocks 10 and 20.

FIG. 9 shows a state in which the corner portion 2 having a different angle θ is constructed by the blocks 10 and 20. 9 (a) shows an angle θ of 70 degrees, FIG. 9 (b) shows an angle θ of 90 degrees, and FIG. 9 (c) shows an angle θ of 110 degrees. When constructing the corner portion 2 at the site, as shown by the broken line, the angle θ is constructed by placing concrete including the area where the reinforcing bars 42 extending from the blocks 10 and 20 overlap each other and constructing the foundation 45. Regardless of this, the retaining wall 1 having a predetermined strength can be constructed.

The configuration of the foundation 40 of the blocks 10 and 20 is an example, and the bottom plate portion 41 may not be provided as described above. On the contrary, at the minimum angle θ assumed as the corner portion 2, a foundation prefabricated with concrete in advance within a range that does not interfere with each other is prefabricated, and a foundation of a type in which reinforcing bars do not protrude is provided. May be good.

As described above, the outer surfaces (outer wall surfaces) 11a and 22a of the main bodies 12 and 22 of the blocks 10 and 20 supported by the foundation 40 have the lower end surfaces 12c and 22c on the outer side 8 with respect to the upper end surfaces 12b and 22b, respectively. It has a gradient 9 that protrudes, the lower side expands, and the upper side recedes inward 7. The inner surfaces (inner wall surfaces) 12d and 22d of the main bodies 12 and 22 have a gradient 9a such that the lower end surfaces 12c and 22c protrude inward 7 with respect to the upper end surfaces 12b and 22b, the lower side expands, and the upper side recedes to the outer side 8. May be provided. In this case, the upper side of the blocks 10 and 20 recedes with respect to the lower side when viewed from the outer side 8 and the inner side 7, and it is easy to give a stable impression.

The sizes (widths) of the upper end surfaces 12b and 22b of the main bodies 12 and 22 and the lower end surfaces 12c and 22c are generally determined in consideration of the strength against the height of the main bodies 12 and 22 and the proof stress against earth pressure and the like. The widths of the upper end surfaces 12b and 22b are narrower than the widths of the lower end surfaces 12c and 22c, thereby determining the gradients of the outer surfaces 12a and 22a and the inner surfaces 12d and 22d. As described above, the blocks 10 and 20 of this example are mainly intended to match the gradient (inclination) 9 of the outer surfaces 12a and 22a with the truncated cone-shaped connecting portions 13 and 23, and the gradient of the outer surfaces 12a and 22a. It is important to secure 9. Therefore, the gradients of the inner surfaces 12d and 22d may be 0%, less than or greater than the gradient 9 of the outer surface, depending on the design of the upper end surfaces 12b and 22b with respect to the lower end surfaces 12c and 22c. It may be decided. In this example, the gradients 9a of the inner surfaces 12d and 22d show blocks 10 and 20 of 0%.

The corner side 4 of the first block 10 and the second block 20 is provided with a first connection portion 13 and a second connection portion 23 connected to the corner side side surfaces 12e and 22e of the wall main body 12 and 22, respectively. ing. On the other hand, the side surfaces 12f and 22f of the first block 10 and the second block 20 opposite to the corner side 4 are vertically steep surfaces, and other L-shaped retaining walls constituting the retaining wall 1. It can be connected to (not shown).

The first connecting portion 13 of the first block 10 has a truncated cone shape, and the outer peripheral surface 13a is continuously connected to the outer surface 12a of the wall body 12 so as to be connected flush with each other without any step or unevenness. 13x is formed so as to be eccentric to the inner side 7 with respect to the center of the wall body 12. The first connecting portion 13 is provided so as to be connected to or integrated with the lower half portion of the corner side 4 of the wall body 12, and is provided along the center (central axis) 13x at the center 13x of the circular upper surface 13b. A hole 15 extending vertically (vertically) is provided. The hole 15 may penetrate the first connecting portion 13 up and down, or may be a bottomed hole having an appropriate depth. The upper portion of the first connecting portion 13 on the corner side 4 of the wall body 12 is a side surface 12e inclined so as to be in contact with the second connecting portion 23 having a truncated cone shape. The side surface 12e extends diagonally upward from the upper surface 13b of the first connecting portion 13 so as to be inclined or protrudes in the direction of the center 13x, so as to be along the truncated cone-shaped outer peripheral surface 23a of the second connecting portion 23. It is formed in an arc shape. The side surface 12e may be a flat surface that is in contact with the truncated cone-shaped outer peripheral surface 23a of the second connecting portion 23.

The first connecting portion 13 is configured to protrude from the inner surface 12d of the main body 12 to the inner side 7 of the block 10. When viewed from the inner side 7, the boundary line 12g between the first connecting portion 13 and the main body 12 is , It is connected to the side surface 12e of the upper main body 12 in a straight line with the same gradient.

The second connection portion 23 of the second block 20 is also a truncated cone shape, and a continuous integrated cone base is formed on the truncated cone shape (first cone shape) of the first connection portion 13. It has a shape to form (second truncated cone). The center 23x is 7 inside the center of the wall body 22 so that the outer peripheral surface 23a of the second connecting portion 23 is also continuously connected to the outer surface 22a of the wall body 22 and is connected flush with each other without any step or unevenness. It is formed so as to be in an eccentric position. The second connecting portion 23 is provided so as to be connected to or integrated with the upper half portion of the corner side 4 of the wall body 22, and is perpendicular to the center (central axis) 23x of the circular upper surface 23b. A hole 25 extending vertically) is provided so as to penetrate the second connecting portion 23. The lower side of the second connecting portion 23 of the corner side 4 of the wall main body 22 is a side surface 22e inclined so as to be in contact with the first connecting portion 13 having a truncated cone shape. The side surface 22e extends diagonally downward from the bottom surface 23c of the second connecting portion 23 in a direction away from the center 23x or so as to be recessed, and is along the truncated cone-shaped outer peripheral surface 13a of the first connecting portion 13. It is formed in an arc shape. The side surface 22e may be a flat surface that is in contact with the truncated cone-shaped outer peripheral surface 13a of the first connecting portion 13.

Also in the second block 20, the second connecting portion 23 is configured to protrude from the inner surface 22d of the main body 22 to the inner side 7 of the block 20, and when viewed from the inner side 7, the second connecting portion 23 and the second connecting portion 23. The boundary line 22g with the main body 22 is connected to the side surface 22e of the lower main body 22 in a straight line with the same gradient. It should be noted that a part of the inner side 7 of the first connecting portion 13 and the second connecting portion 23 is not exposed to the outer side 8 when the corner portion 2 is constructed. Therefore, the inner side 7 of the first connecting portion 13 and the second connecting portion 23 may be formed so as to be partially chipped, for example, a flat surface.

When the first block 10 and the second block 20 are constructed so that the second connecting portion 23 and the first connecting portion 13 overlap each other, the bottom surface 23c of the second connecting portion 23 and the first connecting portion are constructed. The upper surface 13b of 13 has the same shape, for example, a circular shape having the same diameter, and the first connecting portion 13 and the second connecting portion 23 are concentrically combined with the central axes 13x and 23x in common, whereby the first connecting portion 13 and the second connecting portion 23 are concentrically combined. , A truncated cone-shaped corner assembly 30 is configured. The central axis 13x of the first connecting portion 13 and the central axis 23x of the second connecting portion 23 are aligned with the corner 3, the bottom surface 23c and the upper surface 13b are sliding surfaces, and the first is centered on the central axes 13x and 23x. By rotating the wall body 11 and the second wall body 21 relatively, the corner portion 2 where the wall bodies 12 and 22 intersect at a desired angle θ can be constructed.

FIG. 10 shows an example of constructing the corner portion 2 of the retaining wall 1. First, the first block 10 and the second block 20 are combined at the place where the corner portion 2 is to be constructed. The first wall 11 of the first block 10 has a first truncated cone-shaped connection to the lower side of the side (corner side) 4 adjacent to the second wall 21 of the second block 20. The second wall 21 of the second block 20 including the portion 13 is coaxially connected to the first connecting portion 13 on the upper side (corner side) 4 adjacent to the first wall body 11. Includes a second truncated cone-shaped second connection 23 that forms a continuous truncated cone shape above the first truncated cone. Further, the upper end surface 12e of the adjacent side 4 of the main body 12 of the first wall body 11 includes a surface having a slope common to the slope of the outer surface 23a of the second connecting portion 23. By making the end surface 12e a common gradient with the outer surface 23a of the connecting portion 23, the gap when combined can be reduced. On the other hand, since the upper end of the end surface 12e is in a protruding state, the first block 10 and the second block 20 cannot be combined only by moving in the vertical direction.

Therefore, when constructing the corner portion 2 by combining the first block 10 and the second block 20, the second connection portion 13 of the first wall body 11 and the second wall body 21 are second. It is necessary to adopt a step of combining at least one of the connecting portions 23 by a moving method including a movement of moving in the horizontal direction. For example, after installing the first block 10 in a predetermined place, the second block 20 is slid in the direction of the first block 10, and the second connecting portion 23 and the first connecting portion 13 are moved up and down. The through hole 25 of the second connecting portion 23 and the hole 15 of the first connecting portion 13 are matched with each other.

Next, as shown in FIG. 10B, a reinforcing bar or other rod-shaped member 51 is inserted so as to connect the through holes 25 and the holes 15 with respect to the upper and lower sides along the central axes 13x and 23x of the connecting portions 13 and 23. do. Since the rod-shaped member 51 serves as a connecting shaft in which the first block 10 and the second block 20 rotate around the corners 3 with the corners 3 as the central axes 13x and 23x, the first connecting portion 13 and the second block 20 The connection portion 23 is relatively rotated to adjust the angle θ formed by the walls 11 and 21 so as to be a desired angle.

After that, as shown in FIG. 10 (c), the rod-shaped member 51 is pulled out or set as it is, and the mortar or other adhesive 52 is injected into the through hole 25 to form the first block 10 and the second block 10. Blocks 20 are fixed to each other. After that, as shown in FIG. 9, concrete is cast by appropriately combining reinforcing bars 42 extending inward 7 from the respective blocks 10 and 20, and the foundation 45 of the corner portion 2 is constructed.

The boundary portion between the first block 10 and the second block 20, that is, between the first connecting portion 13 and the end surface 22e of the second wall body 21, and the second connecting portion 23 and the first. A minute gap (clearance) is provided between the wall 11 and the end surface 12e so that they can rotate with each other. Therefore, the gap may be filled with mortar or the like.

The angle θ formed by the first wall body 11 and the second wall body 21 is not limited to the angle shown in FIG. 9, and can be flexibly set according to the angle of the corner portion 2 at the site.

FIG. 11 shows an example of different corner blocks 5. The base portion 40 of the first block 10 and the second block 20 of this example extends to the inner side 7 in two steps without providing the bottom plate portion 41 under the inner side 7 of the main bodies 12 and 22 (protruding). E) Includes a plurality of reinforcing bars 42. The reinforcing bar 42 may have one stage as in the above-mentioned example, or may have three or more stages according to the strength or the construction site.

FIG. 12 shows an example of a further different corner block 5. The base portion 40 of the first block 10 and the second block 20 of this example includes a bottom plate portion 41 prefabricated under the inner side 7 of the main body 12 and 22. The bottom plate portion 41 is prefabricated into a shape that does not interfere even if the angle θ formed by the first wall body 11 and the second wall body 21 is variable, and one example is a triangle or a shape close to it as shown in the figure. The configuration of the foundation portion 40 is not limited to these, as long as it can support the first wall body 11 and the second wall body 21 with sufficient strength, and even if there is an opening in the center of the bottom plate portion 41. Often, the bottom plate portion 41 and the wall bodies 11 and 21 may be connected via other configurations such as ribs.

By constructing the corner portion 2 using the corner block 5 of this example in this way, the retaining wall 1 inclined so that the outer wall surface recedes upward, including the outer peripheral surface 3a of the corner portion 2, is constructed. And can be provided. Further, the corner portion 2 is composed of a truncated cone-shaped structure 30 having a thin upper portion, and the upper second connecting portion 23 is outside the lower first connecting portion 13 by any chance during or after construction. Even if it sticks out a little, it hardly gives the impression of instability or fragility as a whole. Therefore, the labor required for the construction of the corner portion 2 can be reduced, and the retaining wall 1 having an excellent aesthetic appearance can be constructed.

The side surfaces 12e and 22e of the corner side 4 of the wall bodies 11 and 21 may be side surfaces extending vertically. In particular, when the upper side surface 12e extends in the vertical direction, the first block 10 and the second block 20 can be combined from the vertical direction (vertical direction), and the construction of the corner portion 2 becomes easier. Further, a connecting member can be embedded in advance along the shaft 13x or 23x in the upper surface 13b of the first connecting portion 13 or the lower surface 23c of the second connecting portion 23.

Further, although the example in which the corner assembly 3 is divided into two vertically is described above, it may be divided into three or more. For example, the second wall 21 of the second block 20 is coaxially connected to the first connection portion 13 to form a continuous truncated cone shape at the lower part of the first truncated cone shape. It may include a third connection portion of the shape. Further, the first wall 11 of the first block 10 may be provided with a fourth cone-shaped connection portion connected to the lower side of the third connection portion. Further, as described above, the configuration of the base portion 40 of the first block 10 and the second block 20 is not limited to the above. Further, the wall bodies 11 and 21 may include a configuration in which further different functions such as a guardrail foundation and a wall foundation are added to the upper end surfaces 12b and 22b.

1 Retaining wall, 2 Corner 10 1st block, 11 1st wall body, 12 Wall body, 13 1st connection part 20 2nd block, 21 2nd wall body, 22 Wall body, 23 2nd Connection part of

Claims (13)

A concrete product for constructing the corners of retaining walls.
The first concrete wall and
It has a second wall body made of concrete arranged adjacent to the left or right of the first wall body, and has.
The first wall body includes a first truncated cone-shaped connection portion on the lower side adjacent to the second wall body.
The second wall body is coaxially connected to the first connection portion on the upper side on the side adjacent to the first wall body, and has a continuous cone shape on the upper part of the first cone shape. A concrete product comprising a second truncated cone-like second connection to form. In claim 1,
The first wall body and at least one wall body of the second wall body include an outer wall surface having a slope common to the slope of the outer peripheral surface of the first connection portion and the second connection portion. product. In any one of claims 1 and 2,
A concrete product comprising a hole extending along the central axis of the first connection portion of the first wall body and the second connection portion of the second wall body. In any one of claims 1 to 3,
A concrete product in which the upper portion of the adjacent end surface of the first wall body includes a surface having a slope common to the slope of the outer surface of the second connection portion. In claims 1 to 3,
A concrete product in which the lower portion of the adjacent end surface of the second wall body includes a surface having a slope common to the slope of the outer surface of the first connection portion. In any of claims 1 to 5,
A concrete product in which the first wall body and the inner wall surface of the second wall body are inclined so that the upper wall thickness is reduced. In any of claims 1 to 6,
The second wall body is coaxially connected to the first connecting portion, and a third truncated cone-shaped connecting portion forming a continuous truncated cone shape at the lower portion of the first truncated cone shape. Including concrete products. In any of claims 1 to 6,
The first wall body is a concrete product containing the first connection portion in a lower half portion, and the second wall body includes the second connection portion in an upper half portion. It is a method of constructing a corner portion of a retaining wall using a first concrete wall body and a second concrete wall body arranged adjacent to the left or right of the first wall body. hand,
The first wall body includes a first truncated cone-shaped connection portion on the lower side adjacent to the second wall body, and the second wall body is the first wall body. A second truncated cone-shaped connection that is coaxially connected to the first connecting portion on the upper side of the side adjacent to the body and forms a continuous truncated cone shape on the upper side of the first truncated cone shape. The upper portion of the end face on the adjacent side of the first wall body includes the portion, and the upper portion of the end surface on the adjacent side includes a surface having a slope common to the slope of the outer surface of the second connection portion.
A construction method comprising a step of horizontally moving and combining at least one of the first connection portion of the first wall body and the second connection portion of the second wall body. In claim 9.
The second wall has holes that penetrate vertically along the central axis of the second connection.
A construction method comprising a step of inserting a connecting shaft into the hole and relatively rotating a first connecting portion and a second connecting portion to adjust an angle. A concrete product for constructing the corners of retaining walls.
A first wall body made of concrete, having a first wall body to which a second wall body is connected to the left or right.
The first wall body is a truncated cone-shaped first wall body provided at the lower part on the side adjacent to the second wall body and at the upper part on the side adjacent to the first wall body of the second wall body. A concrete product comprising a truncated cone-shaped first connection that is coaxially connected to the connection of 2. A concrete product for constructing the corners of retaining walls.
A second wall made of concrete, having a second wall to which the first wall is connected to the left or right.
The second wall is a truncated cone-shaped second wall provided at the upper part on the side adjacent to the first wall and at the lower part on the side adjacent to the second wall of the first wall. A concrete product comprising a truncated cone-shaped second connection coaxially connected to one connection. A retaining wall having a corner portion including the first wall body and the second wall body of the concrete product according to claims 1 to 8.

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