JP2021181733A - Block for retaining wall - Google Patents

Abstract

To provide a block for a retaining wall which enables a retaining wall such as a header stop of a revetment or a slope face with a predetermined gradient to be more easily constructed.SOLUTION: A block for a retaining wall has a front block 10 constructing a front side and a rear block 20 constructing a rear side. At least one block of the front block 10 and the rear block 20 includes an approximately U-shaped inner surface 11. In one block and the other block of the front block 10 and the rear block 20, the other block is slid along the approximately U-shaped inner surface 11 of the one block, and the one block and the other block are combined to form a space 30 to be filled with a filler such as concrete.SELECTED DRAWING: Figure 2

Description

The present invention relates to a retaining wall block such as a fore-edge stopper block.

Patent Document 1 describes the edge-stopping block and the edge-stopping construction method using the block, in order to insulate and prevent the displacement and breakage of the slope on the river bank or the road from continuously spreading to other parts. It is disclosed that the edge-stopping structure provided at regular intervals has good workability, the construction period is shortened, and the structure is robust. The disclosed method is a method of stacking small edges to a predetermined height by stacking edges blocking blocks formed by rectangular fiber reinforced concrete facing the precast concrete blocks or side plates of precast concrete. At the same time as stacking the second-stage edge-stopping blocks, the retaining walls such as the Machi block are stacked in the left-right extension direction of the side plates of the rectangular fiber-reinforced concrete or precast concrete of the edge-stopping block. It is disclosed that it will be possible to go.

Japanese Unexamined Patent Publication No. 2014-156756

It provides a block that makes it easier to construct a revetment or slope with a predetermined slope.

One aspect of the present invention is a retaining wall block having a front block constituting the front side and a rear block constituting the back side. At least one of the front and rear blocks contains a substantially U-shaped inner surface. Further, one block of the front block and the rear block and the other block are combined so that the other block slides along the substantially U-shaped inner surface of the one block. Therefore, one block and the other block form a space for filling the filler, and by changing the length of the space, the distance (length, depth) between the front surface of the front block and the back surface of the rear block is changed. Can provide retaining wall blocks that can be adjusted in the field.

The inclination of the front surface of the front block and the inclination of the back surface of the rear block may be different. In this retaining wall block, the difference in length between the upper and lower retaining wall blocks caused by the difference between the inclination of the front surface and the inclination of the back surface can be freely adjusted in the field. The retaining wall block may be combined so that the rear block slides on the inner surface of the front block. Front blocks forming the front wall of the slope can be placed adjacent to each other. The side wall of the front block may be provided with a hole through which a filler such as mortar (ready-mixed concrete) flows for connection.

One block of the front block and the rear block may include a substantially U-shaped inner surface, and the other block may be a hollow block. It is possible to reduce the space for filling fillers such as concrete on site. The height of the front block and the height of the rear block may be different. When adjusting the height of the retaining wall (height of the ceiling, height of the upper end surface), the block with a hollow inside is easy to cut in the field, so it is a block of a larger unit than the block without a hollow. Can be supplied at.

At least one of the front block and the rear block may include at least one of a protrusion and a recess in at least one of the upper end surface and the lower end surface. By stacking up and down so as to combine the convex portions and the concave portions, it is possible to suppress the movement back and forth and / or left and right. Both sides of the front block, both sides or the back of the rear block may include inserts for mounting ropes or jigs that temporarily secure the expansion of the space to be filled.

The retaining wall block may be a block for edge-stopping construction. A typical retaining wall block is a precast (factory prefabricated) concrete block. The concrete block constituting the front block and the concrete block constituting the rear block of the retaining wall block are also included in the claims of the present invention. The concrete block may be a precast concrete block, a fiber reinforced concrete block, a porous concrete block, or another concrete-molded block. The retaining wall block may be a metal block such as a galvanized steel plate or a resin block, but a concrete block having excellent durability and economy is preferable.

One of the other aspects of the present invention is a retaining wall that is at least partially constructed using the retaining wall block described above.

One of the further different aspects of the present invention is a method of manufacturing a retaining wall using the above-mentioned retaining wall block. The method may include the following steps.
1. 1. Combining one block of the front and rear blocks with the other block so that the other block slides along the substantially U-shaped inner surface of one block.
2. 2. Filling the space formed by the front and rear blocks with filler.

The combination may include combining the rear blocks so that they slide along the inner surface of the front block, and include combining the front tilt of the front block so that the tilt of the back surface of the rear block is different. But it may be. In addition, the combination is to attach a rope or jig that temporarily fixes the expansion of the space filled with the filler by using the inserts provided on both sides of the front block, both sides of the rear block, or the back surface. May include.

An unfolded perspective view showing an outline of a retaining wall block. Top view showing the assembled state of the retaining wall block. A side view showing a state in which a retaining wall (edge stopper) is constructed by a retaining wall block. A cross-sectional view showing a state in which a retaining wall (edge stopper) is constructed by a retaining wall block. Plan view (a), (e), right side view (b), (f), (g), bottom view (c), (h), and front view of the front block and the rear block of the retaining wall block. The figure which shows (d) and (i). The figure which shows the state which temporarily fixed the retaining wall block. Top view showing another example of a retaining wall block.

FIG. 1 shows an example of a retaining wall block by an expanded perspective view, and FIG. 2 shows an example of a state in which the retaining wall block is assembled as viewed from the upper end. The retaining wall block 1 has a concrete front block 10 constituting the front side 5 and a concrete rear block 20 constituting the back side 6. At least one of the front block 10 and the rear block 20 includes a substantially U-shaped inner surface 11. In this example, the front block 10 includes a substantially U-shaped (substantially U-shaped) inner surface 11 that opens toward the back surface 6. The front block 10 and the rear block 20 are combined so that the rear block 20 slides along the substantially U-shaped inner surface 11 of the front block 10, and the front block 10, the inner surface 11, and the rear block 20 form concrete. A space 30 is formed to fill the space 30. That is, in the retaining wall block 1 of this example, the rear block 20 is combined so as to slide along the inner surface 11 of the front block 10.

3 and 4 show a state in which the retaining wall 50 is constructed by stacking the retaining wall blocks 1 of this example. FIG. 3 shows a state in which the retaining wall blocks 1 are stacked as viewed from the side, and FIG. 4 shows a state in which the retaining wall blocks 1 are viewed in cross section. The retaining wall block 1 of this example is a block for constructing a small-edge stopper (small-edge stopper) 51 of a retaining wall (revetment) 50. The edge stop (edge stop structure) 51 is a wall structure constructed at the end of the slope 55 or at an appropriate interval, and particularly protects the upstream and downstream ends of the revetment work (glue lining). It is installed when necessary. Even if riverbank erosion occurs upstream and downstream of the revetment, the structure will prevent scouring due to the flow wrapping around behind the revetment. In addition, horizontal strips may be provided at intervals of several tens of meters in the middle of the revetment construction section, and edge stoppers may be provided to insulate the revetment so that displacement or damage does not spread to others.

The edge stopper 51 is configured by stacking a plurality of retaining wall blocks (blocks of the edge stopper construction method) 1 on the foundation block 39 constituting the lowest layer on the excavation surface 56 on the back surface where the bank 59 is excavated. .. In the edge stopper 51 of this example, the angle θ2 of the refracting surface 56 on the back surface has a 4-minute gradient (1:04, 68 degrees), and the angle θ1 of the slope 55 on the front surface has a 5-minute gradient (1:05, 63 degrees). It has become. The angle θ1 of the front surface (slope) 55 and the angle θ2 of the back surface (excavation surface) 56 are not limited to this, and the angle θ1 of the front surface 55 may have a 6-minute gradient (1:06, 59 degrees). The angle θ2 of 56 may be a three-minute gradient (1:03, 73 degrees). The angle θ1 of the front surface 55 may be smaller than the angle θ2 of the back surface 56, the angle θ1 of the front surface 55 may be larger than the angle θ2 of the back surface 56, and the angle θ1 of the front surface 55 and the angle θ2 of the back surface 56 are the same. You may. When the angle θ1 of the front surface 55 and the angle θ2 of the back surface 56 are different, the length (width, depth) L2 of the retaining wall block 1 stacked in the lower stage and the length (width) of the retaining wall block 1 stacked in the upper stage. , Depth) Different from L1. In the retaining wall block 1 of this example, this difference in length can be freely set (absorbed) at the site.

5 (a) shows a plan view of the front block 10 as viewed from above, FIG. 5 (b) shows a right side view, FIG. 5 (c) shows a bottom view, and FIG. 5 (d) shows a front view. Is shown. The front block 10 is symmetrical, and the left side view appears symmetrically with the right side view. Further, the rear view has the same outline as the front view, and the end faces of the left and right side walls constituting the substantially U-shaped inner surface described later appear. The front block 10 of the retaining wall block 1 includes a front wall 15 tilted to form a slope 55, and left and right side walls 17 and 18 extending from the front wall 15 toward the rear 6. A substantially U-shaped inner surface 11 that opens toward the rear 6 is configured. The left and right side walls 17 and 18 extend horizontally so as to form a substantially U-shape (substantially U-shaped) with respect to the front wall 15 when viewed from the upper and lower end faces 12 and 13, and a substantially U-shaped inner surface 11 is formed vertically. Has been done. The cross section between the upper and lower end faces 12 and 13 is also a substantially U-shape that opens toward the rear 6. The joint portion 19 between the front wall 15 and the side walls 17 and 18 projects diagonally inward and is thickly formed so as to form a substantially U-shape (gate shape).

The rear end faces 16 of the side walls 17 and 18 are set to have the same angle θ2 as the back surface 56. Therefore, the front block 10 is a trapezoidal block when the front surface 15 is tilted at an angle θ1 (5 minutes in this example) and the back surface 16 is tilted at an angle θ2 (4 minutes in this example) when viewed from the side surface. .. The angle of the front surface 15 and the angle of the back surface 16 may be the same, and the front block 10 may be a block having a parallelogram shape when viewed from the side surface.

The front surface of the front wall 15 may be provided with a pattern 15f forming the surface of the edge stopper 51, or may be provided with a pattern having a sense of unity with other slopes 55. In this example, a pattern of a substantially square masonry 15f is applied. A concave portion 14a and a convex portion 14b are formed on the upper end surface 15a and the lower end surface 15b of the front wall 15, and when the retaining wall blocks 1 are stacked vertically, the concave portion 14a and the convex portion 14b mesh with each other in the front-rear direction. It is designed not to move from side to side. The concave portion 14a and the convex portion 14b may be provided in the opposite direction.

5 (e) shows a plan view of the rear block 20 as viewed from above, FIGS. 5 (f) and 5 (g) show a right side view, FIG. 5 (h) shows a bottom view, and FIG. 5 (f) shows. The front view is shown in i). The rear block 20 is symmetrical, and the left side view appears symmetrically with the right side view. Further, the rear view has the same outline as the front view. The rear block 20 of the retaining wall block 1 is along the rear surface 26 tilted at an angle θ2 (4 minutes in this example) in contact with the excavated surface (rear surface) 56 of the embankment (bank) 59 and the inner surface 11 of the front block 10. It is a hollow concrete block provided with left and right side surfaces 27 and 28 provided in an insertable width and a front surface 25 inclined so as to be parallel to the rear surface 26. The length from the front wall 25 to the rear wall 26 (length in the front-rear direction) may be a length that can be stored in the substantially U-shaped inner surface 11 of the front block 10, or may be shorter than that. It may be longer. In this example, the rear surface 26 and the front surface 25 are parallel, and the rear block 20 is a parallelogram when viewed from the side surface, but the front surface 25 has the same angle θ1 as the front wall 15 of the front block 10. In the example, it may be tilted in 5 minutes), or it may be trapezoidal when viewed from the side.

The width of the rear block 20 (distance between the left and right sides 27 and 28) slides along the inner surface 11 of the front block 10 and is inserted from the substantially U-shaped inner surface 11 and the rear 6 to the inner surface 11. It suffices that a temporary formwork is formed at the site by the front surface 25 of the 20 and the space 30 can be easily filled with a filler such as concrete (ready-mixed concrete, mortar) at the site. Therefore, with respect to the width of the substantially U-shaped inner surface 11, the width of the rear block 20 is such that it can be easily inserted into the inner surface 11 and is easily closed by the injected mortar, for example, about several mm. It suffices if it is set to the dimension in which the gap is formed. The filler is not limited to concrete (mortar) as long as it can exhibit appropriate strength and can obtain sufficient durability, but concrete is currently preferable from the viewpoint of price.

The height of the rear block 20 of this example is different from the height of the front block 10, and is formed to be about half the height of the front block 10. Therefore, it is possible to insert two rear blocks 20 into one front block 10. The height (vertical or vertical length) of the rear block 20 may be the same as the height of the front block 10, may be half, or may be 1/3 or less. When adjusting the height of the top of the retaining wall 50, a short retaining wall block may be prepared, or the retaining wall block 1 may be cut at the site. It is not easy to adjust the size of the non-spaced rear block 20 in the field with respect to the internal space front block 10. Therefore, by preparing the rear block 20 divided in advance, it is possible to facilitate the size adjustment at the site.

The front surface 25 of the rear block 20 may include a portion 29 that is cut diagonally to correspond to the gate-shaped portion 19 of the front block 10. A concave portion 24a and a convex portion 24b are formed on the upper end surface 22 and the lower end surface 23 of the rear side block 20, and when the retaining wall blocks 1 are stacked vertically, the rear side block 20 also has the concave portion 24a. The convex portion 24b meshes with the convex portion 24b so as not to move back and forth and left and right. The concave portion 24a and the convex portion 24b may be provided in the opposite direction.

As an example of the typical size of the retaining wall block 1 for constructing the edge stopper, the width of the front block 10 is 403 mm, the length of the upper end surface 12 is 750 mm, the length of the lower end surface 13 is 850 mm, and the height is high. The inner surface of the substantially U-shape has a length of 650 mm on the upper side, 750 mm on the lower side, and a width of 303 mm, the width of the rear block 20 is 298 mm, the length of the upper end surface 22 is 700 mm, and the height is 300 mm. The dimensions of the front block 10 and the rear block 20 of the retaining wall block 1 are not limited to this.

As shown in FIG. 4, when constructing the edge stopper 51 by the retaining wall block 1, the front surface (front wall) 15 of the gradient θ1 of the front block 10 is installed so as to match the slope 55, and the rear block is installed. The rear block 20 is combined so as to slide along the inner surface 11 of the front block 10 so that the rear surface 26 of the gradient θ2 of 20 matches the excavated surface (rear surface) 56 of the bank 59. After that, the space 30 formed by the front block 10 and the rear block 20 is filled with concrete 53 at the site. By stacking the retaining wall blocks 1 combined in this way, the slope of the slope 55 is 5 minutes and the slope of the back surface 56 is 4 minutes. Can be easily constructed by the retaining wall block 1 in which the same front block 10 and the rear block 20 are combined. Further, in the retaining wall block 1, the wall is constructed while burying the rear block 20 together with the front block 10. Therefore, it is possible to repeat the assembly of the retaining wall block 1 and the filling of the concrete (mortar) 53 one after another, and it is not necessary to wait for the filled concrete to solidify before breaking the formwork. .. Therefore, it is possible to construct a retaining wall such as a fore-edge stopper 51 by stacking retaining wall blocks 1 in a short period of time, for example, in one day. The uppermost stage 51a of the edge stopper 51 having the shortest length may be composed of only the front block 10 and the inner surface 11 may be filled with concrete 53.

Therefore, by using the retaining wall block 1 of this example, even if the retaining wall 50 has different lengths on the upper side and the lower side, a plurality of product types are not required depending on the required holding length, and the holding wall 50 is not required. It is possible to suppress an increase in cost due to a plurality of formwork for making products having different lengths. Further, if the edge stopper 51 has a structure in which the slope (front) 55 is 5 minutes and the back 56 is 4 minutes, the combination of the inner surface 11 and the rear block 20 is performed even if the height from the foundation to the heaven is different. As long as it can be handled by, it is possible to construct with one type of retaining wall block 1, and it is possible to prepare a plurality of products and improve the utilization efficiency of the inventory space for stocking them. Further, since the utilization efficiency of the inventory space can be improved, the retaining wall block 1 can be mass-produced in advance, and can be shipped in a short delivery time according to the demand of the site. Further, even at the construction site, since the front block 10 and the rear block 20 can be combined with the length required at the site, an extra part than the actually required holding length is generated, which is uneconomical. Can also be prevented. For this reason, it is possible to eliminate the product cost of the extra part, and it is not necessary to take the trouble of carving more slopes in order to match the length of the retaining wall block even at the construction site.

Further, when the retaining wall block 1 of this example is used to construct a fore-edge stopper 51 having a design in which the slope 55 is 5 minutes and the back surface 56 is 3 minutes, the rear block 20 is changed to the one in which the back surface 26 is 3 minutes. Then, it may be combined with the front block 10, and it is not necessary to manufacture a dedicated retaining wall block each time. The same applies to the edge stopper 51 having an angle of the slope 55 other than 5 minutes, and the front block 10 having the front wall 15 matching the angle θ1 of the slope 55 and the rear surface 26 having the front wall 56 matching the angle θ2 of the back surface 56 are provided. It is possible to provide a retaining wall block 1 in combination with the provided rear block 20. Therefore, by adopting the retaining wall block 1 of this example, it is possible to cope with various designs of the edge stopper 51 by combining a small number of types of front block 10 and rear block 20. The edge stopper 51 can be installed at low cost and in a short period of time.

The edge stop block disclosed in Patent Document 1 is divided into a front block and a back block, and after installing with a required holding length, the front and back are connected, and both sides are covered with a control panel or the like and fixed. Therefore, it is necessary to drive ready-mixed concrete. This control panel needs to be removed after the ready-mixed concrete has hardened. On the other hand, in the retaining wall block 1 of this example, the space 30 for filling the concrete 53 can be formed by the front block 10 and the rear block 20. Therefore, the work process of fixing using a control panel becomes unnecessary, and the construction time can be shortened. In addition, the control panel cannot be removed until a certain curing period has passed after the ready-mixed concrete is placed, and it is not possible to backfill or construct side-by-side blocks until the control panel is removed. Although there is a problem, in the retaining wall block 1 of this example, the control panel is unnecessary, and the problem of removing it can be avoided. Further, in the retaining wall block 1 of this example, since the front block 10 and the rear block 20 are directly combined, it is stable even when it is not filled with concrete, and the retaining wall block is stable during construction. It is possible to suppress a situation in which 1 loses balance and falls. In the retaining wall block 1 of this example, the space 30 composed of the front side block 10 and the rear side block 20 may be filled with concrete 53 for each stage, and several stages of retaining wall blocks 1 are stacked. Later, the formed space 30 may be filled with concrete 53.

FIG. 6 shows a state in which the front block 10 and the rear block 20 are temporarily fixed after being aligned at the site when the retaining wall 50 is constructed. Inserts 35 for temporary fixing may be included in both side surfaces (both side walls) 17 and 18 of the front block 10. The rear block 20 may include a rope (wire) 37 for temporarily fixing the expansion of the space 30 to be filled or an insert 36 for mounting a jig on both side surfaces 27 and 28 or the back surface 26. The inserts 35 and 36 may be embedded nut type inserts or embedded bolt type inserts. By temporarily fixing the front block 10 and the rear block 20 with a wire 37 or the like, it is possible to prevent the space 30 formed by the front block 10 and the rear block 20 from expanding when filling concrete, which is desired. The block 1 for the retaining wall of the length (holding length) can be manufactured with high accuracy on site.

FIG. 7 shows some different examples of retaining wall blocks by combining the upper end surface 12 of the front block 10 and the upper end surface 22 of the rear block 20. In the retaining wall block 1 described above, the rear block 20 is combined so as to slide along the inner surface 11 of the front block 10, whereas the retaining wall block 1a in FIG. 7 (a) is a rear block. A front block 10 with a spaceless concrete body 60 including a substantially U-shaped inner surface 21 opened forward 5 is slid and assembled along the inner surface 21 of the rear block 20. The front block 10 may include a front wall 15 protruding to the left and right in front of the main body 60 so as to be in contact with the front wall of an adjacent retaining wall block.

FIG. 7B is an example of a retaining wall block 1b for constructing a retaining wall 50 of a slope main body, and includes a substantially U-shaped inner surface 11 in which the front block 10 opens toward the rear 6. The rear block 20 includes a substantially U-shaped inner surface 21 that opens toward the front 5. In the retaining wall block 1b, these substantially U-shaped (substantially U-shaped) inner surfaces 11 and 21 may be combined so as to face each other to form a space 30 for filling concrete. Through holes 38 may be provided in both side walls 17 and 18 of the front block 10, and the filled concrete can circulate with the retaining wall blocks 1b constituting the left and right to improve the left and right connecting force. Is. Reinforcing bars for connection may be inserted into the through hole 38.

FIG. 7C is an example of a retaining wall block 1c for constructing a retaining wall 50 of a slope main body, and includes a substantially U-shaped inner surface 11 in which the front block 10 opens toward the rear 6. The rear block 20 includes a substantially U-shaped inner surface 21 that opens toward the rear 6. In the retaining wall block 1c, a space 30 for filling concrete is formed by the inner surface 11 of the substantially U-shape (substantially U-shaped) of the front block 10 and the rear block 20, and the substantially U-shape of the rear block 20 is formed. A space 30a for filling concrete or earth and sand can be formed by the inner surface 21 and the back surface 56 of the character shape.

FIG. 7D is an example of a retaining wall block 1d for constructing the retaining wall 50 of the slope main body, and includes a substantially U-shaped inner surface 11 in which the front block 10 opens toward the rear 6. The rear block 20 is hollow and includes a filling space 30b inside. In the retaining wall block 1d, a space 30 for filling concrete is formed by the substantially U-shaped (substantially U-shaped) inner surface 11 of the front block 10 and the rear block 20, and the rear block 20 is the space 30. Separately, it includes a space 30b for filling concrete or earth and sand.

Regardless of which type of retaining wall block 1 to 1d (hereinafter, will be described as a representative of the retaining wall block 1), the retaining wall block 1 can be obtained by combining the front block 10 and the rear block 20. The total length can be easily adjusted on site. Further, the front block 10 and the rear block 20 form a space 30 for filling concrete 53 between them, and retaining walls having different lengths without forming a formwork at the site using a control panel or the like. It is possible to construct a concrete block which is a formwork 1 and is filled with concrete. Therefore, by using the retaining wall block 1 of this example, even if the retaining wall 50 has a different angle between the slope 55 on the front side and the excavated surface 56 on the rear side, for example, the edge stopper 51, it can be done in a short period of time. It can be easily installed.

The retaining wall blocks 1 to 1d including the front block 10 and the rear block 20 described above are typically made of factory prefabricated (precast) concrete, but are stacked after being precast in the field. May be good. Further, both or one of the blocks may be manufactured with the same structure by using a metal such as a galvanized steel plate, but the blocks appearing on the ground surface may lack durability. In the block to be buried, if it is to be reused as a formwork, it will be difficult to shorten the work process, and if it is buried, the construction cost will increase significantly. The concrete constituting the retaining wall blocks 1 to 1d may be reinforced concrete containing FRP or resin fibers. Further, the retaining wall block 1 may be made of a resin having the same durability and economy as concrete.

Claims (15)

It has a front block that constitutes the front side and a rear block that constitutes the back side.
At least one of the front block and the rear block includes a substantially U-shaped inner surface, and one block and the other block of the front block and the rear block, and the other block is the one. Retaining wall blocks that slide along the substantially U-shaped inner surface of the block and are combined so that the one block and the other block form a space for filling the filler. In claim 1,
A retaining wall block that is combined so that the posterior block slides along the inner surface of the anterior block. In claim 1 or 2,
A retaining wall block in which the inclination of the front surface of the front block differs from the inclination of the back surface of the rear block. In any one of claims 1 to 3,
A retaining wall block in which one of the front block and the rear block includes the substantially U-shaped inner surface, and the other block is a hollow block. In any of claims 1 to 4,
A retaining wall block in which the height of the front block and the height of the rear block are different. In any of claims 1 to 5,
A retaining wall block in which at least one of the front block and the rear block comprises at least one of a convex portion and a concave portion in at least one of an upper end surface and an lower end surface. In any of claims 1 to 6,
A retaining wall block comprising an insert for mounting a rope or jig for temporarily fixing the expansion of the filling space on both sides of the front block, both sides or the back of the rear block. In any of claims 1 to 7,
The retaining wall block is a retaining wall block, which is a block for edge-stopping construction. A concrete block constituting the front block of the retaining wall block according to claims 1 to 8. A concrete block constituting the rear block of the retaining wall block according to claims 1 to 8. A retaining wall constructed at least partially using the retaining wall block according to claims 1 to 8. It is a method of manufacturing a retaining wall using a retaining wall block.
The retaining wall block has a front block constituting the front side and a rear block constituting the back side, and at least one block of the front block and the rear block has a substantially U-shaped inner surface. Including,
The method is
Combining the front block and one block and the other block of the rear block so that the other block slides along the inner surface of the one block.
A method comprising filling a space formed by the front block and the rear block with a filler. In claim 12,
The combination comprises combining the posterior blocks so that they slide along the inner surface of the anterior blocks. In claim 12 or 13,
The combination comprises combining such that the inclination of the front surface of the front block and the inclination of the back surface of the rear block are different. In any of claims 12 to 14,
The combination is to attach a rope or jig that temporarily secures the expansion of the space in which the filler is filled, using inserts provided on both sides of the front block, both sides or the back of the rear block. Methods, including doing.

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