JP5431782B2 - Retaining wall block for corner and its construction method - Google Patents

Description

  The present invention relates to a corner retaining wall block, and more particularly, to a corner retaining wall block suitable for placement in a corner portion at a construction site using an L-shaped retaining wall and a construction method thereof.

  For example, when building a residential land or the like, a so-called L-shaped retaining wall, which is a L-shaped concrete product made up of a vertical wall and a bottom plate, is often used at a place where earthing is required.

  Since the place where the earth is held is not necessarily a straight line, naturally, L-shaped retaining walls may be arranged side by side across the corner.

  At that time, as for the corner, conventionally, when the angle is 90 degrees, a dedicated corner block manufactured in advance is used, or when the corner angle is an obtuse angle, the bottom plate is appropriately cut according to the angle L I used a retaining wall. Or, for corners, it was possible to install on-site formwork and cast concrete to perform construction.

  However, even if the corner of the site is set to 90 degrees, there are many cases where there is actually a slight error. Therefore, if it is manufactured according to the site, it is very time-consuming and increases the cost. Further, when the bottom plate is cut, if the reinforcing bar is exposed for that purpose, it causes corrosion, and if it is corroded, there is a risk that cracks or the like may occur in the surrounding concrete. If the bottom plate is actually cut, it takes much time and causes a cost increase. Also, if it is on-site, it takes time and labor to arrange the formwork carpenter, the process of placing the frame, ready-mixing, and curing, resulting in a sense of discomfort due to the difference in appearance from other L-type retaining walls. There is a risk of letting you.

  Therefore, in recent years, a structure in which a pair of retaining walls formed of adjacent first retaining walls and second retaining walls forming a corner are connected to each other in a hinge shape so that the coupling angle can be freely changed. The thing was proposed (for example, refer patent document 1).

  Further, the first retaining wall is connected to the first retaining wall by the connecting member that connects the first retaining wall and the second retaining wall so that the angle of the corner formed by the first retaining wall and the second retaining wall adjacent to each other can be changed. There is also known one in which a gap is formed between the wall and the second retaining wall (see, for example, Patent Document 2).

JP 2004-36247 A JP 2007-247388 A

  However, the conventional configuration still has various problems. In other words, in the configuration of Patent Document 1, it is convenient that the hinge-jointed configuration can be freely adjusted to the corner angle, but at this time, the adjacent first retaining wall and second retaining wall are convenient. Since the bottom plates of the walls overlap each other and interfere with each other, they interfere with angle adjustment.

  Moreover, in the structure of patent document 2, since the 1st retaining wall and the 2nd retaining wall are connected by the connection member, the storage, conveyance, etc. are not easy. Moreover, unless the connecting portion between the first retaining wall and the second retaining wall is bent, it is difficult to make the first retaining wall and the second retaining wall connected to each other self-supporting at the construction site. . However, bending the connecting portion in advance is disadvantageous for storage and transportation.

  The present invention has been made to solve the above problems, and provides a retaining wall block for a corner that can be easily arranged corresponding to the corner angle in a construction site using a so-called L-shaped retaining wall and a construction method thereof. The purpose is to do.

(1) The present invention made to achieve the above object is a retaining wall block for a corner disposed in the corner portion of the retaining wall structure in which the retaining wall blocks are juxtaposed across the corner portion, and includes a hinge. The retaining wall block comprises a set of retaining wall blocks connected by a structure, each retaining wall block having a projecting portion extending in the longitudinal direction formed in the approximate center of one side surface of the longitudinal wall, and the projecting shape. the vertical wall and a plurality of reinforcing bars projecting from the lower surface of, have a, the lower end portion of the convex portion, corner retaining wall block projecting portion projecting to the left and right that are formed comprising a part It was.

  (2) According to the present invention, in the corner retaining wall block according to (1), the pair of retaining wall blocks includes a pair of left and right retaining members having the convex portion and formed in a substantially T shape in plan view. The hinge structure includes an upper connection portion and a lower connection portion that are coupled via a pivot pin, and the upper connection portion is a first retaining wall that forms one of the pair of retaining wall blocks. It is formed on one side edge of the vertical wall of the block, and the lower connecting portion is formed on one side edge of the vertical wall of the second retaining wall block forming the other of the pair of retaining wall blocks. Features.

  (3) The present invention provides the corner retaining wall block according to (1) or (2), wherein the set of retaining wall blocks includes a central block positioned at a chamfered portion of the corner portion, and a hinge structure on the left and right thereof. The left and right blocks are connected to each other, and the vertical wall of each block is formed with a convex portion extending in the vertical direction.

  (4) The present invention provides the corner retaining wall block according to (3), wherein the central block includes a block main body having a vertical wall formed with a convex portion extending in the vertical direction, and a bottom wall of the vertical wall. The hinge is composed of a pair of blocks including a first central block and a second central block each having a plurality of reinforcing bars protruding from the side surface and a hinge structure provided on one end face of the vertical wall. It is characterized in that the side end surfaces not provided with the hinge structure are abutted and arranged in parallel at positions where the structures are separated from each other.

  (5) The corner retaining wall block according to (1) to (4), wherein the lower end surface of the convex portion is flush with the lower end surface of the vertical wall, and the upper end surface of the convex portion. Is located below the upper end surface of the vertical wall.

  (6) In the corner retaining wall block according to (1) to (5), the present invention includes a reinforcing bar support portion in which the vertical wall is embedded and fixed to a lower side surface thereof, and a part or all of the plurality of reinforcing bars are provided. It can be detachably attached to the reinforcing bar support portion.

  (7) The present invention provides the corner retaining wall block according to (2) to (6) above, including a reinforcing bar portion for forming a bottom support structure in which the plurality of reinforcing bars are arranged in a plurality of stages, and the reinforcing bar of the reinforcing bar portion. Are arranged in a left-right step with respect to the vertical walls of the left and right blocks connected by the hinge structure.

  (8) The present invention is a method for constructing a corner retaining wall block in which a corner portion is constructed on a construction ground using the corner retaining wall block according to any one of (1) to (7), wherein the block A block self-supporting preparation step for grounding the main body on the construction ground and maintaining the set of retaining wall blocks in a self-supporting state; and a block connecting step for connecting the set of retaining wall blocks by the hinge structure. Further, the reinforcing bar attaching step of attaching the reinforcing bars previously removed so that the front ends of the reinforcing bars protruding from the vertical wall surfaces in the set of retaining wall blocks do not interfere with each other at the corner setting position, to a predetermined reinforcing bar support part, The ready-mixed concrete is poured into a formwork around the reinforcing bar projecting on the lower surface of the corner retaining wall block set at a predetermined angle on the construction ground, and then the retaining wall block is hardened. And having a block bottom forming step of forming a bottom support structure of click in a substantially L shape, a.

  According to the present invention, the pair of retaining wall blocks connected by the hinge structure includes a block main body having a convex portion extending in the vertical direction formed at a substantially center of one side surface of the vertical wall, and the convex portion. Including a plurality of reinforcing bars projecting on the lower surface of the vertical wall, so that the left and right blocks can be made independent at the construction site, and the corner arrangement angle is easy without causing the blocks to interfere with each other. Therefore, it is possible to construct an L-shaped bottom support structure around the reinforcing bar protruding from the vertical wall, and to provide a corner retaining wall block and its construction method that are excellent in handling and assembling workability.

It is a perspective view of the retaining wall block for corners concerning an embodiment. It is a rear view of the retaining wall block for the corners. It is the perspective view and back view of the 1st retaining wall block of the retaining wall block for the corners. It is the perspective view and back view of the 2nd retaining wall block of the retaining wall block for the corners. It is sectional drawing of the 1st retaining wall block of the retaining wall block for the corners. It is sectional drawing of the 2nd retaining wall block of the retaining wall block for the corners. It is sectional drawing which shows the modification of the reinforcing bar attachment form to the retaining wall block for the corners. It is explanatory drawing of the construction method of the retaining wall block for the corners. It is explanatory drawing of the construction method of the retaining wall block for the corners. It is explanatory drawing of the construction method of the retaining wall block for the corners. It is explanatory drawing of the retaining wall block for corners concerning other embodiment.

  The corner retaining wall block of the present embodiment is a corner retaining wall block disposed in the corner portion of the retaining wall structure in which the retaining wall blocks are juxtaposed across the corner portion, and is connected by a hinge structure. The retaining wall block is composed of a set of retaining wall blocks, and each retaining wall block includes a block body having a projecting portion extending in the longitudinal direction and formed at a substantially center of one side surface of the longitudinal wall, and the longitudinal section including the projecting portion. And a plurality of reinforcing bars protruding from the lower surface of the wall. In this embodiment, a set of retaining wall blocks is a pair of left and right retaining wall blocks. Thereby, the left and right retaining wall blocks can be stably made to stand by grounding the bottom surface of the block body formed in a substantially T shape in plan view by the vertical wall and the convex portion. Thus, the corner arrangement angle connected by the hinge structure can be easily set, and the workability at the construction site can be improved.

  As described above, the corner retaining wall block composed of a pair of left and right first retaining wall blocks and second retaining wall blocks, the main part of which is made of concrete, is a retaining wall for earth retaining for residential land development sites and roads. It is applied to the wall structure and fixed by a backfill formed by backfilling the back of the block (so-called “backfill”). In such a retaining wall structure, it is often necessary to provide a corner portion that matches the corner of the construction site, and the angle of the corner portion is usually 90 if the portion is along a crossing portion such as a road. About degrees. Further, since the corner angle is slightly different depending on the site even in a portion along the intersecting intersection, it is necessary to adjust the corner angle for each site.

  The convex part is a rectangular strip formed by extending in the vertical direction at the approximate center of the back side of the vertical wall, which is one side of the vertical wall facing the backfill part. In this case, the convex portion projecting from the vertical wall to the back side can be supported independently by the bottom surface portion which is substantially T-shaped in plan view, and the strength of the retaining wall block can be strengthened. I can do it at the same time. The protruding length of the convex portion from the vertical wall surface is preferably in the range of 1 to 4 times the thickness of the retaining wall main portion, thereby making the retaining wall block stand in a stable state. It can be made to function as a support member for this, and block strength can be raised. In addition, the reinforcing part for a block reinforcement can be arrange | positioned inside the convex part as needed, and the structural strength of the retaining wall block can be ensured more reliably.

  The hinge structure is a structure in which one side surfaces of a pair of left and right retaining wall blocks are connected by a hinge member or a pin engaging member, and the connection angle between the blocks is within a predetermined range, for example, 90 ° ± 15 °, or 90 ° It can be set in an angle range such as ± 25 degrees.

  A plurality of reinforcing bars are projected on the lower surface of the vertical wall including the convex part. At the construction site, a concrete formwork is installed around the reinforcing bars, and the concrete is poured into the concrete formwork for curing. Thus, it is possible to form a bottom support structure that is substantially L-shaped as viewed from the side. In addition, the reinforcing bars placed below the pair of left and right retaining wall blocks are arranged with their reinforcing bar positions shifted vertically so that the reinforcing bars do not interfere with each other when the block is adjusted within a predetermined angle range. It is desirable to keep it.

  In the corner retaining wall block of the present embodiment, the hinge structure includes an upper connection portion and a lower connection portion that are coupled via a pivot pin, and the upper connection portion includes the pair of the upper connection portions. A vertical wall of the second retaining wall block that is formed on one side edge of the vertical wall of the first retaining wall block that forms one of the retaining wall blocks, and the lower connection portion forms the other of the pair of retaining wall blocks Can be formed on one side edge. As a result, the pair of retaining wall blocks can be movably connected within a predetermined angle range via the pivot pin by the upper connection portion and the lower connection portion.

  The upper and lower connection portions formed on the left and right side edges of the first and second retaining wall blocks respectively extend the left and right side edges of the retaining wall block made of concrete to the upper side and the lower side. It is the formed part. By inserting or fixing a pivot pin in a shaft portion formed at the center of the extending portion, the upper connection portion and the lower connection portion are engaged with each other in a freely rotatable manner.

  In the corner retaining wall block of the present embodiment, the lower end surface of the convex portion is flush with the lower end surface of the vertical wall, and the upper end surface of the convex portion is below the upper end surface of the vertical wall. The center of gravity is low. Thus, while lowering the center of gravity of the block main body and forming the bottom surface part that is substantially T-shaped, the retaining wall block can be made stable and independent on the construction ground, and the retaining wall block by the formation of the convex part It is possible to appropriately and reliably strengthen the strength. For example, when installing the retaining wall block for corners on a slope, it is necessary to cut the upper part of the vertical wall in order to align the upper end of each block horizontally. Since it is located below the upper end surface, it is easy to perform a cutting operation.

  In the corner retaining wall block of the present embodiment, the vertical wall includes a reinforcing bar support portion embedded and fixed on the lower side surface thereof, and a part or all of the plurality of reinforcing bars are detachably attached to the reinforcing bar support portion. Can do. Thereby, when adjusting the pair of left and right retaining wall blocks connected by the hinge structure in accordance with the angle of the corner portion, the setting of the retaining wall block can be easily performed on site. That is, select the reinforcing bars to be attached to the reinforcing bar support part of the retaining wall block according to the corner angle, and connect the left and right retaining wall blocks to the construction ground without interfering with the ends of the reinforcing bars protruding from the back of each retaining wall block. Can be properly placed on top. In addition, it is also possible to remove all the reinforcing bars from the back of the retaining wall block as necessary, and to transport the corner retaining wall block from the block manufacturing factory to the construction site in a compact storage state.

  Reinforcing bar support part is a nut member etc. whose female thread part is opened at least toward the back side of the block, the lower end of which is welded to the reinforcing bar for block reinforcement arranged in the vertical wall including the convex part It is fixed and held. Note that the reinforcing bar support portion may be formed as a male screw portion projecting about several centimeters from the back of the vertical wall and screwed to a nut-like female screw portion provided at the base of the rod-shaped reinforcing bar. In this case, a part of the reinforcing reinforcing bar provided in the vertical wall is bent into an L shape and protruded to the vertical wall rear side (backfilling side) to form a male screw part at the tip thereof, or to support the reinforcing bar A concrete retaining wall block is formed by welding and fixing the head side of the bolt member to be a part to a block reinforcing bar and projecting the bolt front end side to the vertical wall back side.

  The reinforcing bar is formed with a male screw part that is screwed to the nut member of the reinforcing bar support part at the base, and a part or all of a plurality of reinforcing bar support parts fixed to the back side of the vertical wall are selected and specified. Several rebars can be placed at predetermined positions on the back of the vertical wall.

  The corner retaining wall block of the present embodiment includes a reinforcing bar portion for forming a bottom support structure in which the plurality of reinforcing bars are arranged in a plurality of stages, and the reinforcing bars of the reinforcing bar portions are connected to each other by the hinge structure. It is arrange | positioned in the left-right step shape with respect to each vertical wall of the retaining wall block. That is, the reinforcing bar support positions for forming the bottom support structure for supporting the plurality of reinforcing bars by projecting them from the vertical wall surface are arranged in a stepped manner with respect to each of the pair of left and right retaining wall blocks connected by the hinge structure. ing. As a result, when adjusting the angle of the left and right corner retaining wall blocks according to the angle of the retaining wall corner at the construction site, it is easy to set without interfering with the tip of the reinforcing bar protruding from the back of each block can do.

  The corner retaining wall block construction method of the present embodiment is a corner retaining wall block construction method for constructing a corner portion on a construction ground using the corner retaining wall block described above, and the block main body is A block self-supporting preparation step for grounding on the construction ground and maintaining a self-supporting state; a block connecting step for connecting the pair of left and right retaining wall blocks by the hinge structure; and a left and right block in the pair of left and right retaining wall blocks connected to each other Reinforcing bar attachment process for attaching the reinforcing bars that have been removed in advance so that they do not interfere with each other at the corner setting position, and the front end side of the reinforcing bars protruding from the surface are set at a predetermined angle on the construction ground Retaining wall block is made by pouring ready-mixed concrete into the formwork around the reinforcing bars protruding from the lower surface of the corner retaining wall block And a block bottom forming step of forming a substantially L-shape bottom support structure. As a result, the retaining wall block can be easily set according to the arrangement angle of the retaining wall corner at the construction site, and an L-shaped bottom support structure can be constructed around the reinforcing bar protruding from the retaining wall. It is possible to provide a method for constructing a retaining wall block for corners, which is excellent in workability for block assembly.

As another embodiment, the corner retaining wall block can be configured to be installed at a corner where the corner is chamfered.
In this case, a set of retaining wall blocks is not a pair of left and right retaining wall blocks, but a center block located at the chamfered portion of the corner and left and right blocks connected to the left and right via a hinge structure. That is, three blocks of the central block, the left block, and the right block are set as one set.

  That is, the central block has a block main body having a vertical wall formed with a convex portion extending in the vertical direction, a plurality of reinforcing bars projecting from the lower surface of the vertical wall, and left and right end surfaces of the vertical wall. And a hinge structure provided on. It should be noted that the right and left blocks are naturally adjustable in connection angle with respect to the central block via hinges.

  At this time, the central block can be composed of a pair of blocks. This pair of blocks leaves the first central block cut out leaving the hinge structure and convex portion of the first retaining wall block in the previous embodiment, and the hinge structure and convex portion of the second retaining wall block. The second central block that is cut in this way can be configured, and the end surfaces of the first and second central blocks are juxtaposed with each other.

  That is, the central block has a block main body having a vertical wall formed with a convex portion extending in the vertical direction, a plurality of reinforcing bars protruding from the lower surface of the vertical wall, and one side end surface of the vertical wall. It is composed of a pair of blocks consisting of a first central block and a second central block each provided with a hinge structure provided, and the hinge structures are located at positions that are separated from each other, and the side end surfaces that are not provided with the hinge structure Are arranged side by side so as to face each other.

  With such a configuration, the corner retaining wall block that can be installed at the corner chamfered portion uses the aforementioned first retaining wall block and second retaining wall block molds without constructing a new mold or the like. And increase in cost can be prevented. Depending on the width of the chamfered portion of the corner where the central block is installed, either the first central block or the second central block may be cut including the convex portion.

Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a perspective view of a corner retaining wall block according to the present embodiment, and FIG. 2 is a rear view thereof. 3 and 4 are a perspective view and a rear view, respectively, showing a pair of left and right retaining wall blocks in the corner retaining wall block.

  As shown in FIG. 1, the corner retaining wall block 10 according to the present embodiment, which is disposed at a corner of a construction site and used for earthing a backfilled portion (backfilled), has a hinge structure. The first retaining wall block 11 and the second retaining wall block 12 are connected at a predetermined angle.

  Each of the retaining wall blocks 11 and 12 includes a block main body having a vertical wall facing the backfill portion, and a single convex portion 13 extending in the vertical direction at a substantially center on the back side of the vertical wall, Reinforcing bar 14 is provided on the lower side of the back surface to form a block bottom support structure. In addition, each convex-shaped part 13 of the 1st, 2nd retaining wall blocks 11 and 12 is each formed in the substantially rectangular shape, The lower end surface is the vertical wall lower end surface of the block main body of each retaining wall block 11 and 12 The upper end surface of the convex portion 13 is positioned below the upper end surface of the vertical wall of the block body.

  As shown in FIG. 2, the hinge structure has an upper connection portion 11a provided at a substantially upper half of one side edge (right side edge in the drawing) of the first retaining wall block 11, and adjacent to the upper connection portion 11a. Opposingly, the lower connection part 12a provided in the substantially lower half part of the one side edge (left side edge on the drawing) of the second retaining wall block 12, the upper connection part 11a, and the lower connection part 12a are rotatable. And a pivot pin 19 for pivotal support.

  Each vertical wall exposed on the outer surface of the retaining wall of the retaining wall blocks 11 and 12 is formed in a substantially rectangular shape in front view, and the vertical wall of the first retaining wall block 11 is located between the side edges of the adjacent vertical walls. The upper side edge part and the lower side edge lower part of the vertical wall of the second retaining wall block 12 are extended outward by a predetermined width to form the upper connection part 11a and the lower connection part 12a.

  The upper connection portion 11a and the lower connection portion 12a are formed in an arc shape at the edge portions, and this is applied when the retaining wall blocks 11 and 12 are connected to each other via a hinge structure to adjust the opening angle. The upper connection portion 11a and the lower connection portion 12a are prevented from interfering with the respective vertical wall edge surfaces of the retaining wall blocks 12 and 11 facing each other.

  The block main body of the retaining wall blocks 11 and 12 is formed by placing ready-mixed concrete mixed with cement, aggregate, admixture, and water into a predetermined block molding mold. The number of reinforcing bars for supporting the block is arranged inside as needed. In the present embodiment, the length of one side of the outer wall of the vertical wall in the block body is about 2 m, and the minimum thickness is about 100 to 150 mm.

  The convex portion 13 provided on the back side of each vertical wall of the retaining wall blocks 11 and 12 protrudes in the range of about 200 to 800 mm from the back of the vertical wall and is formed integrally with the vertical wall. By projecting the lower end of this convex portion 13 in the horizontal direction, the block installation surface is made substantially T-shaped to function as an outrigger at the construction site, and the retaining wall blocks 11 and 12 are stably held on the ground. It is possible to let you. In addition, since the protruding portion 13 is formed with a protruding portion 13a protruding to the left and right at the lower end portion, the degree of stability of the retaining wall blocks 11 and 12 during self-supporting is improved and, as will be described later, At the time of construction of the retaining wall block 10 for the corner, the strength of the retaining wall blocks 11 and 12 is improved as an anchor when the bottom of the block is formed by concrete placement.

  Reinforcing bar portion 14 for forming the bottom support structure of the block bottom, which protrudes in two steps on the back side of retaining wall blocks 11 and 12, protrudes about 5 to 22 mm in diameter with ribs and irregularities provided on the surface. It is a steel material such as a deformed bar or a round bar having a length of about 300 to 1500 mm.

  Moreover, as shown in FIG. 1, the detachable rod-shaped reinforcing bar 15 is arrange | positioned especially about the part of the lower stage in the right side of the convex-shaped part 13 among the reinforcing bar parts 14 of the 1st retaining wall block 11. As shown in FIG. In addition, as a reinforcing bar used for these reinforcing bar parts 14, especially when corrosivity is required, what consists of galvanized steel materials can also be applied as needed.

  5 and 6 are cross-sectional views of the first and second retaining wall blocks 11 and 12, FIG. 5A is a cross-sectional view taken along line AA of FIG. 3B, and FIG. 5B is FIG. 5B is a cross-sectional view taken along line BB in FIG. 3B, FIG. 5C is a cross-sectional view taken along line CC in FIG. 3B, FIG. 5D is a cross-sectional view taken along line DD in FIG. Is a sectional view taken along line EE in FIG. 3B, FIG. 6A is a sectional view taken along line AA in FIG. 4B, FIG. 6B is a sectional view taken along line BB in FIG. 6 (c) is a sectional view taken along the line CC in FIG. 4 (b), and FIG. 6 (d) is a sectional view taken along the line DD in FIG. 4 (b).

  As shown in each cross-sectional view, a plurality of reinforcing bars for block reinforcement are embedded in the vertical wall, the lower end of each reinforcing bar is bent in an L shape and stretched in the horizontal direction, and the vertical wall by the predetermined length. It protrudes from the reinforcing bar attachment position 14a.

  Moreover, the 1st retaining wall block 11 suspended and installed from the upper direction with respect to the 2nd retaining wall block 12 makes | forms a part of the reinforcing bar part 14 of the lower surface of a vertical wall in this embodiment. The bar-shaped reinforcing bar 15 is removed in advance, and is attached to a predetermined reinforcing bar attachment position 14a after the corner angle setting operation at the construction site.

  Moreover, as shown in FIG. 2, the reinforcing bar attachment positions 14 a set so as to be parallel to the upper and lower stages on the lower rear side of each retaining wall block 11, 12 are such that the ends of the reinforcing bars in the reinforcing bar part 14 are at the construction site. When setting according to the corner angle (see FIG. 8A), they are arranged differently in the vertical direction so as not to interfere.

  FIG. 7 is a cross-sectional view of a modified example showing a form of attachment of a bar-shaped reinforcing bar (rebar) for forming a block bottom support structure to a retaining wall block. The cross-sectional position conforms to the line EE in FIG. In this modification, all the reinforcing bars for reinforcing the block are composed of detachable bar-shaped reinforcing bars 15, and the base end side of each bar-shaped reinforcing bar 15 is screwed through a nut member embedded in the reinforcing bar mounting position 14 a on the back of the vertical plate. I wear it.

  That is, as shown in the figure, a male screw portion 15a is provided at the base of the bar-shaped reinforcing bar 15 for forming the block bottom support structure, and the reinforcing bars corresponding to the plurality of reinforcing bar mounting positions 14a of the first and second retaining wall blocks 11, 12. A nut member 16 serving as a support portion is embedded. In this way, the reinforcing bar attachment position 14a can be selected so that the reinforcing bar tips do not interfere with each other at the construction site, and the male threaded part 15a at the base end of the bar-shaped reinforcing bar 15 can be screwed and fixed to the female threaded part of the nut member 16.

  If the reinforcing bar portion 14 can be formed at the construction site by attaching and detaching the rod-shaped reinforcing bar 15 from the back side of the vertical plate in this way, the block main body (vertical length (vertical length) when the first and second retaining wall blocks 11 and 12 are conveyed) The rebar 14 protruding from the wall) does not get in the way and can be efficiently transported to the construction site. In addition, in the block setting work at the construction site, it is possible to avoid interference between the reinforcing bars protruding from the left and right adjacent block back sides.

  Note that a plurality of nut members 16 to which the base ends of the rod-shaped reinforcing bars 15 are attached can be provided in advance in a predetermined shape of the first and second retaining wall blocks 11 and 12 in a lattice shape or an upper and lower row shape. The nut member 16 is formed by being welded and fixed to a part of the block reinforcing bars 17 arranged in a grid pattern or the like on the first and second retaining wall blocks 11 and 12 or by being cast with ready-mixed concrete. The periphery of the member can be fixed by the concrete of the retaining wall block.

  8-11 is explanatory drawing which shows the flow of the construction method of the retaining wall block for corners concerning this embodiment. The corner retaining wall block construction method according to the present embodiment includes a block self-supporting preparation step in which the block body is grounded on the construction ground and the pair of left and right retaining wall blocks 11 and 12 are maintained in an independent state, and the pair of left and right A block connecting step of connecting the retaining wall blocks 11 and 12 by a hinge structure, and tips of the reinforcing bar portions 14 respectively projecting from the left and right vertical walls which become the left and right block surfaces in the pair of left and right retaining wall blocks 11 and 12 connected Reinforcing bar attachment process for attaching the bar-like reinforcing bars 15 previously removed so as not to interfere with each other at the corner part setting position to the nut member 16 that is a predetermined reinforcing bar support part, and a corner set at a predetermined angle on the construction ground The ready-mixed concrete is poured into a concrete mold 18 around the reinforcing bar 14 projecting from the lower surface of the retaining wall block 10. In which a, and the block bottom forming step of forming a substantially L-shape bottom support structure of the retaining wall blocks 11 and 12 is cured.

  That is, as shown in FIG. 8 (a), in the block self-supporting preparation step, first, the first and second retaining wall blocks 11 and 12 are formed in a substantially T shape having the convex portions 13 thereof. Hold the bottom surface as a support surface on the ground of a construction site located in a residential area or factory. That is, by causing the convex portion 13 that protrudes in the horizontal direction on the bottom surface to function as an outrigger, each retaining wall block 11, 12 is stably arranged on the construction surface, and the corner angle setting in both retaining wall blocks 11, 12 is set. Work efficiency for can be improved. Furthermore, by providing such a convex portion 13 on the back surface of the vertical wall, the structural strength as the retaining wall blocks 11 and 12 is enhanced.

  Then, in the block connecting step of connecting the pair of left and right retaining wall blocks 11 and 12 with a hinge structure, after the second retaining wall block 12 is installed, the first retaining wall block 11 is suspended by a crane or the like not shown. 1. The second retaining wall blocks 11 and 12 are engaged with each other on the lower connection portion 12a of the second retaining wall block 12 via a pivot pin 19 so that the connecting angle becomes a predetermined angle. That is, after the retaining wall block 12 is installed, the upper connecting portion 11a is engaged with the lower connecting portion 12a while the retaining wall block 11 is suspended from above (FIG. 8B).

  In the next reinforcing bar attaching step, as shown in FIG. 8B, the bar-shaped reinforcing bar 15 that has been removed in advance, that is, the lower stage of the reinforcing bar portion 14 provided in the lower part of the first retaining wall block 11 should be formed. The rod-like reinforcing bar 15 is screwed and attached to a predetermined nut member 16 after the corner angle (opening angle) of the first and second retaining wall blocks 11 and 12 is set.

  In this way, when the first retaining wall block 11 is suspended, the second retaining wall block 12 is suspended by previously removing the lower bar-like reinforcing bars 15 of the first reinforcing wall block 11 in the two stages. It does not interfere with the rebar part 14 of the. Moreover, in the present embodiment, the reinforcing bar attachment positions 14a are arranged so as to be different in the vertical direction between the first and second retaining wall blocks 11 and 12, so that even after the bar-like reinforcing bars 15 are attached, When setting the angle (opening angle), even when the first and second retaining wall blocks 11 and 12 are shifted in the horizontal direction, there is no interference between the reinforcing bar portions 14, and a smooth corner angle (opening angle) can be adjusted. It is.

  Thus, in this embodiment, according to the corner angle of a construction site, the opening angle of both the retaining wall blocks 11 and 12 can be adjusted with the standing state (FIG.8 (c)). At this time, if it is a configuration like the modification shown in FIG. 7, the reinforcing bar attachment position 14 a to which the bar-like reinforcing bar 15 is attached can be appropriately selected as necessary.

  Next, in the block bottom portion forming step, as shown in FIG. 9A, a plurality of reinforcing bars and rod-like reinforcing bars 15 projecting from the lower side of the corner retaining wall block 10 appropriately arranged according to the corner angle of the construction site. A concrete mold 18 is constructed around the reinforcing bar portion 14 made of the above.

  Then, the ready-mixed concrete is placed on the concrete formwork 18, and the ready-mixed concrete is hardened and cured (FIG. 9B). At this time, since the protruding portion 13a formed at the lower end of the convex portion 13 functions as an anchor, the joint between the block main body and the block bottom portion 10a becomes extremely strong, and the joint portion between the convex portion 13 and the block bottom portion 10a. There is no risk of cracks. Thus, after curing, the concrete formwork 18 is removed as necessary to form a block bottom 10a at the bottom of the first and second retaining wall blocks 11 and 12, and for a corner whose longitudinal section is substantially L-shaped. The retaining wall block 10 can be formed (FIG. 9C). As will be described later, the block bottom portion 10a is covered with the backfill portion, and the corner retaining wall block 10 is held by receiving the weight of the earth and sand in the backfill portion.

  When the construction of the retaining wall block 10 for corners is completed as described above, the retaining wall block installation process is finally performed. In this retaining wall block installation process, a retaining wall block is constructed by sequentially adding L-shaped retaining wall blocks 20 for forming a normal flat retaining wall surface connected to the corner portion in the left-right direction of the retaining wall block 10 for corners. To do.

  That is, as shown in FIG. 10A, first, the L-type retaining wall block 20 is positioned and arranged on one side of the corner retaining wall block 10. In this way, the L-shaped retaining wall block 20 is extended and arranged in both the left and right directions of the corner retaining wall block 10 according to the construction conditions (FIG. 10B), and the entire retaining wall structure including the corner portion is configured at the construction site. (FIG. 10C).

  Finally, on the bottom support structure including the substantially L-shaped block bottom 10a in the entire retaining wall structure, a backfill portion is formed by filling and filling earth and sand or concrete, and the corner retaining wall block 10 And the retaining wall structure containing a corner part can be constructed | assembled on the ground of a construction site by hold | maintaining the L-shaped retaining wall block 20 in the stable state with the weight of a backfill part.

  Moreover, as other embodiment, it can also be set as the retaining wall block 100 for corners as shown in FIG. This is a configuration that can be installed at a corner chamfered. FIG. 11 is an explanatory view of a corner retaining wall block according to another embodiment. Note that the same components as those in the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in the figure, in this embodiment, a set of retaining wall blocks is not composed of the pair of left and right first and second retaining wall blocks 11 and 12 described in the previous embodiment, but a corner chamfered portion. And a left block 110 and a right block 120 connected to the left and right sides of the central block 130 via a hinge structure. In other words, in this embodiment, the corner retaining wall block 100 is configured as a set of three blocks of the central block 130 including the first central block 131 and the second central block 132, and the left block 110 and the right block 120. doing. At this time, the left block 110 and the right block 120 may have exactly the same configuration as the first retaining wall block 11 and the second retaining wall block 12 in the previous embodiment.

  Further, the central block 130 according to the present embodiment is constituted by a pair of blocks of a first central block 131 and a second central block 132.

  In addition, the first central block 131 is cut by leaving the upper connecting portion 11a provided with the hinge structure of the first retaining wall block 11 in the previous embodiment and the convex portion 13, and the second central block 131 is cut. The block 132 is cut so as to leave the lower connecting portion 12a provided with the hinge structure of the second retaining wall block 12 and the convex portion 13 in the previous embodiment.

  Therefore, according to this embodiment, the first retaining wall block 11 and the second retaining wall block 12 described above can be used as they are, and the corner retaining wall block 100 that can be installed at a corner chamfered portion is provided. This can be realized while suppressing an increase in cost.

  As shown in the drawing, the first central block 131 and the second central block 132 are juxtaposed in a state in which the end faces where the upper connection portion 11a and the lower connection portion 12a are not formed are attached to each other.

  Therefore, the central block 130 has a vertical wall in which two convex portions 13 extending in the vertical direction are formed in parallel at the center, and the vertical walls 13 and 13 are like clog teeth in plan view. Protrusions will be formed.

  In addition, although description here is abbreviate | omitted, the retaining wall block 100 for inners which concerns on this embodiment can also be constructed on-site in the same procedure as previous embodiment.

  According to the embodiment described above, the following retaining wall block for corners and the method for constructing the retaining wall block for corners can be realized, and the following effects are produced.

  For example, a retaining wall block for a corner disposed in the corner portion of the retaining wall structure in which L-shaped retaining wall blocks 20 (retaining wall blocks) are juxtaposed across the corner portion, and are connected by a hinge structure. The first retaining wall block 11 and the second retaining wall block 12 are composed of a pair of retaining wall blocks 11 and 12, each retaining wall block 11 and 12 being formed in a substantially central portion of one side surface of the longitudinal wall. A corner retaining wall block 10 having a block main body having a protruding portion 13 extending in a direction and a reinforcing bar portion 14 formed of a plurality of reinforcing bars protruding from the lower side surface of the vertical wall including the protruding portion 13.

  With this configuration, the corner arrangement angle can be easily set without causing the left and right retaining wall blocks 11 and 12 to interfere with each other at the construction site.

  The hinge structure includes an upper connection portion 11a and a lower connection portion 12a that are connected via a pivot pin 19, and the upper connection portion 11a is a first retaining wall that forms one of the pair of retaining wall blocks. The lower connecting portion 12a is formed on one side edge of the vertical wall of the second retaining wall block 12 forming the other of the pair of retaining wall blocks. Retaining wall block 10 for corner.

  With such a configuration, for example, by using a crane or the like, the first retaining wall block 11 is suspended from the upper side of the second retaining wall block 12 and installed, thereby easily connecting both retaining wall blocks 11 and 12. It becomes possible.

  Further, the lower end surface of the convex portion 13 is flush with the lower end surface of the vertical wall, and the upper end surface of the convex portion 13 is positioned below the upper end surface of the vertical wall. 10.

  By using the corner retaining wall block 10 having such a configuration, the block strength and the placement stability can be improved without unnecessarily increasing the amount of concrete used.

  Further, the vertical wall includes a nut member 16 (reinforcing bar support portion) embedded and fixed to the lower side surface thereof, and a part or all of the reinforcing bar portion 14 such as a rod-shaped reinforcing bar 15 can be detachably attached to the nut member 16. The retaining wall block 10 for a corner.

  With this configuration, when the first retaining wall block 11 is suspended, it does not interfere with the reinforcing bar portion 14 of the second retaining wall block 12.

  Furthermore, it has the reinforcement part 14 for bottom part support structure formation which has arrange | positioned the said some reinforcing bar in multiple steps, and the reinforcement of the said reinforcement part 14 is a pair of left and right to which the reinforcement attachment position 14a is connected by the said hinge structure. A corner retaining wall block 10 arranged in a left-right step with respect to the vertical walls of the retaining wall blocks 11, 12.

  With this configuration, when adjusting the corner angle (opening angle), even when the first and second retaining wall blocks 11 and 12 are shifted in the horizontal direction, there is no interference between the reinforcing bar portions 14, and a smooth corner angle (opening) Angle) can be adjusted.

  Further, it is a construction method of a corner retaining wall block in which a corner portion is constructed on the construction ground using each of the corner retaining wall blocks 10 described above, and a pair of left and right retaining members are grounded on the construction ground. A block self-supporting preparation step for maintaining the wall blocks 11 and 12 in an independent state, a block connecting step for connecting the pair of left and right retaining wall blocks 11 and 12 by the hinge structure, and the pair of left and right retaining wall blocks connected to each other 11 and 12, the rod-shaped reinforcing bars 15 that have been removed in advance so that the front end sides of the reinforcing bar portions 14 (a plurality of reinforcing bars protruding from the respective vertical walls) do not interfere with each other at the corner setting position are set to predetermined reinforcing bar attachment positions 14 a. Reinforcing bar attaching process to be attached, and a reinforcing bar portion 14 on the lower surface of the corner retaining wall block 10 set at a predetermined angle on the construction ground (on the vertical wall) And a block bottom forming step for forming the bottom support structure of the retaining wall blocks 11 and 12 in a substantially L shape by pouring the ready-mixed concrete into the concrete formwork 18 around the plurality of reinforcing bars provided) Retaining wall block construction method.

  According to this method, the corner retaining wall block 10 can be constructed very easily and efficiently.

  Moreover, as another embodiment, the center block 130 located in the chamfered portion of the corner portion and the left and right blocks 110 and 120 connected to the left and right via a hinge structure, a set of retaining wall blocks, A corner retaining wall block 100 in which convex portions 13 extending in the vertical direction are formed on the vertical walls of the blocks 100, 110, and 120.

  According to this configuration, it is possible to easily install the corner retaining wall block 100 even in a portion where the corner is chamfered.

  The central block 130 includes a block main body having a vertical wall formed with a convex portion 13 extending in the vertical direction, a plurality of reinforcing bar portions 14 projecting from a lower surface of the vertical wall, and the vertical block. A hinge structure provided on one end face of the wall, and a pair of blocks including a first central block 131 and a second central block 132, and the hinge structure at a position where the hinge structures are separated from each other. Retaining wall block 100 for corners in which side end surfaces not provided with are arranged in parallel with each other.

  With such a configuration, the manufacturing type of the first retaining wall block 11 and the second retaining wall block 12 can be used as it is, and the corner retaining wall block 100 that can be installed at a chamfered corner increases the cost. Can be realized.

  As described above, according to the present invention, a pair of retaining wall blocks connected by a hinge structure can be stably arranged by a convex portion so that the corner arrangement angle can be easily set, and the lower surface of the block protrudes. Further, the gist of the present invention is to construct an L-shaped bottom support structure around a plurality of reinforcing bars, and is not limited to the above-described embodiment.

  ADVANTAGE OF THE INVENTION According to this invention, the retaining wall block for corners excellent in the handleability and the assembly workability | operativity can be provided. Further, the corner retaining wall block construction method of the present invention can be applied even at construction sites such as soft ground, and is generally applied to different portions of the corner portion to obtain a substantially L-shaped block bottom. Can be easily formed. Note that the corner retaining wall block is not limited to a pair of retaining wall blocks connected by a connecting portion, but various forms in which the curvature changes in a complex manner by connecting three or more retaining wall blocks. It is also possible to construct a retaining wall structure.

10,100 Retaining wall block for corner 10a Block bottom 11 Retaining wall block (first retaining wall block)
11a Upper side connection part 12 Retaining wall block (2nd retaining wall block)
12a Lower side connection part 13 Convex part 14 Reinforcing bar part 14a Reinforcing bar attachment position 15 Bar-like reinforcing bar 15a Male thread part 16 Nut member (reinforcing bar support part)
17 Reinforcing bars for block reinforcement 18 Formwork for concrete 19 Pivot pin
20 L-type retaining wall block 110 Left block 120 Right block 130 Center block 131 First center block 132 Second center block

Claims (8)

A retaining wall block for a corner disposed in the corner portion of the retaining wall structure in which retaining wall blocks are juxtaposed across the corner portion,
It consists of a set of retaining wall blocks connected by a hinge structure,
Each retaining wall block is
A block main body having a convex portion extending in the vertical direction formed in the approximate center of one side of the vertical wall;
A plurality of reinforcing bars projecting from the lower surface of the vertical wall including the convex part;
I have a,
The corner retaining wall block is characterized in that a protruding portion that protrudes to the left and right is formed at the lower end of the convex portion . The set of retaining wall blocks comprises a pair of left and right retaining wall blocks that have the convex portions and are formed in a substantially T shape in plan view.
The hinge structure is
An upper connection portion and a lower connection portion coupled via a pivot pin;
The upper connecting portion is formed on one side edge of the vertical wall of the first retaining wall block forming one of the pair of retaining wall blocks, and the lower connecting portion is a second one forming the other of the pair of retaining wall blocks. The corner retaining wall block according to claim 1, wherein the corner retaining wall block is formed on one side edge of the vertical wall of the two retaining wall blocks. The set of retaining wall blocks is composed of a central block located at a chamfered portion of a corner portion and left and right blocks connected to the left and right via a hinge structure, and extends vertically in the vertical wall of each block. 2. A corner retaining wall block according to claim 1, wherein a convex portion is formed. The central block includes a block main body having a vertical wall formed with a convex portion extending in the vertical direction, a plurality of reinforcing bars protruding from the lower surface of the vertical wall, and one end face of the vertical wall. A pair of blocks comprising a first central block and a second central block provided with a hinge structure, and at the positions where the hinge structures are separated from each other, the side end surfaces not provided with the hinge structure The corner retaining wall blocks according to claim 3, which are arranged in parallel with each other. The lower end surface of the convex portion is flush with the lower end surface of the vertical wall, and the upper end surface of the convex portion is located below the upper end surface of the vertical wall. The retaining wall block for corners of any one of 1-4. The vertical wall includes a reinforcing bar support portion embedded and fixed on a lower surface thereof, and a part or all of the plurality of reinforcing bars can be detachably attached to the reinforcing bar support portion. The retaining wall block for a corner according to any one of the above. Reinforcing part for forming a bottom support structure in which the plurality of reinforcing bars are arranged in a plurality of stages, and the reinforcing bars of the reinforcing bar part are stepped left and right with respect to the vertical walls of the left and right blocks connected by the hinge structure. The corner retaining wall block according to any one of claims 2 to 6, wherein the corner retaining wall block is disposed at the corner. A method for constructing a corner retaining wall block for constructing a corner portion on a construction ground using the corner retaining wall block according to claim 1,
A block self-supporting preparation step of grounding the block main body on the construction ground and maintaining a set of retaining wall blocks in a self-supporting state;
A block connecting step of connecting the set of retaining wall blocks by the hinge structure;
Reinforcing bar attachment step of attaching the reinforcing bars previously removed so that the front end sides of the reinforcing bars projecting from the vertical wall surfaces of the set of retaining wall blocks connected to each other do not interfere with each other at the corner setting position to the predetermined reinforcing bar support part When,
The bottom support structure of the retaining wall block is substantially L-shaped by pouring the ready-mixed concrete into the formwork around the reinforcing bars protruding from the lower surface of the corner retaining wall block set at a predetermined angle on the construction ground. A block bottom forming step to be formed;
The construction method of the retaining wall block for corners characterized by having.

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