JP7703813B2 - How to apply rapple concrete - Google Patents

Description

The present invention relates to a method for constructing rapple concrete.

For example, when constructing a building on ground where there is soft ground in a relatively shallow range of the surface layer and hard ground below the soft ground, a method may be applied in which the soft ground is excavated and removed, ruffled concrete is laid, and the building is constructed on the ruffled concrete. Here, "soft ground" refers to ground that does not have the bearing capacity to directly support the building to be constructed in relation to the building, and also refers to ground that is prone to liquefaction or ground that is prone to subsidence due to consolidation settlement, etc. In contrast, "hard ground" refers to ground that is not at risk of liquefaction or subsidence due to consolidation settlement and can support the building to be constructed. For example, clay soil with an N value of 15 or more (preferably 20 or more) and sandy soil with an N value of 30 or more can be considered hard ground. Therefore, when rapple concrete is laid on hard ground and the weight of a building is supported by the rapple concrete, the weight of the building is transferred to the hard ground through the rapple concrete and is supported by the hard ground.

Unlike ground improvement methods in which the ground is mixed with cement, rapple concrete is used to replace excavated areas of soft ground with rapple concrete made of unreinforced concrete. It uses concrete with a design standard strength of approximately 18 N/ ^mm2 and is constructed using concrete with a low unit price, such as by mixing crushed stone as coarse aggregate. This makes it possible to construct a bearing layer on top of hard ground with a strength equal to or greater than that of hard ground while keeping construction costs down compared to ground improvement methods in which cement-based solidification materials are mixed into the ground or columnar ground improvement methods using improvement piles.

When excavating soft ground, a common practice is to construct a retaining wall to surround the excavation area, install wales made of H-shaped steel or the like inside the retaining wall in response to the excavation of the soft ground, and install struts made of H-shaped steel or the like between the opposing wales, thereby excavating the soft ground while suppressing deformation of the retaining wall. In this case, there is an issue that the struts become entangled in the excavation area, and that the struts become an obstacle to construction, reducing workability, not only in various temporary construction works, including excavation work deeper than the struts, but also in construction of the foundations of permanent buildings. In addition, the installation of many wales and struts poses an issue in terms of the time and cost required for temporary construction, and this issue becomes even more pronounced in large-scale construction sites where the excavation area covers a wide area.

At construction sites where the above-mentioned wrap concrete is to be constructed, it is desirable to develop technology that can eliminate the need for wales and struts to support the earth retaining wall, as this makes it possible to raise the support layer of a building more cheaply than with normal ground improvement construction, and by eliminating the need for wales and struts, the time required for temporary construction can be shortened, further reducing construction costs.

Here, Patent Document 1 proposes a rapple concrete construction method in which horizontal struts and shelf piles are not provided on the retaining wall. This rapple concrete construction method is a rapple concrete construction method in which an earth retaining wall is constructed around the ground to be excavated, the ground is excavated along the earth retaining wall to the supporting ground, rapple concrete is poured, and a foundation is constructed on top of the rapple concrete after it has hardened. In this construction method, when excavating to the supporting ground, the ground to be excavated is divided horizontally along the earth retaining wall to the required width, the divided excavated ground is divided into section A, section B one space away from section A, and section C between section A and section B, the order of excavation of the sections is section A, section B, and section C, and rapple concrete is poured after excavation of each section, and then the method moves to another section, and excavation is performed without providing horizontal struts and shelf piles on the earth retaining wall.

JP 2013-122111 A

The rapple concrete construction method described in Patent Document 1 is said to make it unnecessary to install braces, but since this method involves dividing the construction area horizontally along the retaining wall into multiple sections, and then excavating the ground and pouring rapple concrete for each section in sequence, it is applicable to sites with relatively narrow construction areas that are long in one direction, either horizontally or vertically. However, at sites that have a certain degree of expansion in both the vertical and horizontal directions, it is difficult to construct rapple concrete while dividing the area into multiple sections in this way without installing braces.

The present invention was made in consideration of the above problems, and aims to provide a method for constructing rapple concrete that can be used inside an enclosed area surrounded by a planar retaining wall without the need for installing wales and struts.

In order to achieve the above object, one aspect of the method for constructing rapple concrete according to the present invention is to
A process includes constructing an earth retaining wall on the ground, and excavating the ground in an area inside an enclosed area surrounded by the earth retaining wall and having a smaller planar dimension than the enclosed area to a position that will become the bottom surface of the rapple concrete to be constructed later, thereby constructing a first flooring surface;
Step B: constructing a center ruffle concrete on the first floor surface;
A step C of excavating the ground between the side of the central ruffle concrete and the retaining wall intermittently in a plan view to a position that is the bottom surface of the ruffle concrete to construct a plurality of second flooring surfaces;
and step D of constructing strut trupple concrete on the second floor surface;
By sequentially repeating steps C and D, a plurality of strut rapple concretes are constructed connecting the sides of the entire circumference of the central rapple concrete to the retaining wall, thereby constructing a rapple concrete unit consisting of the central rapple concrete and a plurality of the strut rapple concretes.

According to this aspect, the ground is excavated in an area with a relatively small planar dimension inside the retaining wall to construct a first flooring surface, and then central ruffle concrete is placed on top of the first flooring surface. After that, the ground between the central ruffle concrete and the retaining wall is intermittently excavated to construct multiple second flooring surfaces, and multiple strut ruffle concrete is placed on each second flooring surface. By connecting the entire area between the side of the central ruffle concrete and the retaining wall with multiple strut ruffle concrete, it becomes possible to construct the ruffle concrete inside the enclosed area surrounded by the retaining wall, which has a wide planar dimension, without the need to install wales and struts.

The area of the first bedding surface relative to the area of the enclosed area surrounded by the retaining wall can be set according to the strength of the excavated ground, excavation depth, etc. For example, if the ground has a certain degree of self-supporting properties, the ground can be excavated with an excavation wall that is nearly vertical, and if the ground has low self-supporting properties, the ground is excavated with a low slope gradient, so the area of the first bedding surface will be relatively small.

For example, inside the enclosed area surrounded by the earth retaining wall, a first bedding surface is constructed that is smaller than the enclosed area and has a similar or nearly similar shape to the enclosed area, and central rapple concrete is constructed on top of that. Here, "central rapple concrete" refers to rapple concrete that is constructed in advance in the center or nearly the center of the enclosed area surrounded by the earth retaining wall. By constructing the central rapple concrete in advance, the surrounding side surfaces and the entire area of the surrounding earth retaining wall can be connected with strut rapple concrete, for example, simultaneously or sequentially. For example, when constructing strut rapple concrete sequentially, it is preferable to construct the strut rapple concrete in order starting from the area where the earth retaining wall is most likely to deform.

"Strut rapple concrete" refers to rapple concrete that connects both the side of the central rapple concrete and the earth retaining wall facing this side like a strut, and can also be called a virtual strut made of rapple concrete. However, strut rapple concrete is still rapple concrete, and while it has the function of supporting the earth retaining wall like a normal strut, it is ultimately part of a rapple concrete unit that is installed over the entire inside area surrounded by the earth retaining wall.

In another aspect of the method for constructing rapple concrete according to the present invention,
In the B step, the planar shape of the earth retaining wall and the planar shape of the central ruffle concrete are both rectangular, and the central ruffle concrete is constructed so that corresponding sides of each rectangle face each other,
In the plan view shape of the retaining wall, the two side surfaces of the central ruffle concrete corresponding to the two long sides of the rectangle and the ground between the retaining wall corresponding to the two long sides are sequentially or simultaneously subjected to the steps C and D, thereby connecting the side surfaces and the retaining wall corresponding to the side surfaces with a plurality of the strut ruffle concretes,
Next, steps C and D are repeated sequentially or simultaneously on the ground between the two side surfaces of the central ruffle concrete corresponding to the two short sides of the rectangle and the retaining walls corresponding to the two short sides, thereby connecting the side surfaces and the retaining walls corresponding to the side surfaces with a plurality of the strut ruffle concretes.

According to this aspect, the planar shape of the earth retaining wall and the central rapple concrete are both rectangular, and the central rapple concrete is constructed so that the corresponding sides of each rectangle face each other. Then, strut rapple concrete is constructed in advance on the ground between the earth retaining wall and the two sides of the central rapple concrete that correspond to the two long sides of the rectangle where the deformation of the earth retaining wall is greatest. This makes it possible to realize the construction of rapple concrete that is highly safe while eliminating the need for struts.

Here, "rectangle in plan view" includes not only rectangles and squares in plan view, but also shapes with slightly tapered chamfered corners (and therefore, strictly speaking, polygons other than rectangles). Also, "repeating steps C and D simultaneously" means that the work of constructing multiple second bedding surfaces intermittently is carried out simultaneously with multiple heavy machinery, resulting in the simultaneous construction of second bedding surfaces, for example, in the ground in an area corresponding to the long sides, and then strut-trupp concrete is simultaneously applied to the simultaneously constructed second bedding surfaces, for example, using multiple concrete pump trucks.

In another aspect of the method for constructing rapple concrete according to the present invention,
In the B step, the planar shapes of the retaining wall and the central ruffle concrete are both polygonal or polygonal and curved unit shapes, and the central ruffle concrete is constructed so that the corresponding sides of each face each other;
By repeating steps C and D for the side of the central ruffle concrete corresponding to the longest straight line or the longest curve in the plan view shape of the earth retaining wall and the ground between the side of the central ruffle concrete and the earth retaining wall corresponding to the side, the side and the earth retaining wall corresponding to the side are connected with a plurality of the strut ruffle concretes, and this construction is performed sequentially for the ground corresponding to the next longest straight line or curve in the earth retaining wall.

According to this aspect, even when the planar shape of the earth retaining wall and the central rapple concrete is various shapes other than a rectangle, the central rapple concrete is constructed so that the corresponding sides of the earth retaining wall and the central rapple concrete face each other, and then the strut rapple concrete is constructed first on the ground between the side of the central rapple concrete that corresponds to the longest straight line or longest curve in the planar shape of the earth retaining wall and the corresponding earth retaining wall, and the strut rapple concrete is constructed sequentially in order of the length of the straight lines or curves. In this way, by constructing the strut rapple concrete sequentially according to the magnitude of the deformation of the earth retaining wall, it is possible to realize the construction of rapple concrete with high construction safety while eliminating the need for struts.

As can be understood from the above explanation, the method for constructing rapple concrete of the present invention makes it possible to construct rapple concrete inside an enclosed area surrounded by a planar retaining wall without the need for installing wales and struts.

FIG. 2 is a plan view illustrating steps A and B of an example of a construction method for rapple concrete according to the first embodiment. 1B is a vertical cross-sectional view taken along the line BB in FIG. 1A, illustrating steps A and B. 1 , and FIG. 2 is a plan view illustrating steps C and D of an example of a construction method for rapple concrete according to the first embodiment. 2B is a view taken along the line BB in FIG. 2A, and is a vertical cross-sectional view illustrating steps C and D. 2 , is a plan view illustrating the repetition of steps C and D in an example of a construction method for rapple concrete according to the first embodiment. FIG. 3B is a vertical cross-sectional view taken along the line BB in FIG. 3A, illustrating the repetition of steps C and D. 4 is a plan view illustrating the construction method of the rapple concrete according to the first embodiment, following FIG. 3. FIG. 5 is a plan view illustrating the construction method of the rapple concrete according to the first embodiment, following FIG. 4. FIG. FIG. 11 is a plan view illustrating steps A and B of an example of a construction method for rapple concrete according to the second embodiment. 6 , this is a plan view illustrating steps C and D of an example of a construction method for rapple concrete according to the second embodiment. 7 , is a plan view illustrating the repetition of steps C and D in an example of a construction method for rapple concrete according to the second embodiment. FIG. 8 , is a plan view illustrating a construction method for rapple concrete according to a second embodiment. FIG.

Below, an example of a construction method for rapple concrete according to each embodiment will be described with reference to the attached drawings. Note that in this specification and drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[Construction method of rapple concrete according to the first embodiment]
First, an example of a construction method for rapple concrete according to the first embodiment will be described with reference to Figures 1 to 5. Here, Figures 1A, 2A, 3A, 4, and 5 are process diagrams showing an example of a construction method for rapple concrete according to the first embodiment in plan view, respectively, and Figures 1B, 2B, and 3B are views taken along the line B-B in Figures 1A, 2A, and 3A, respectively.

The illustrated example of the earth retaining wall 10 is constructed in a rectangular shape in plan view on the ground G at the construction site. Depending on the properties of the ground G (layer conditions (clay layer, sandy layer, gravel layer, etc.), strength of each layer, presence or absence of groundwater and water level), etc., the earth retaining wall 10 may be in a suitable form such as a parent pile horizontal sheet pile wall, a steel sheet pile wall, a soil cement column wall (SMW wall), a steel pipe sheet pile wall, or a cast-in-place pile wall.

As shown in Figures 1A and 1B, first, inside the enclosed area A surrounded by the rectangular retaining wall 10 in plan view, the ground in an area smaller in plan view than the enclosed area A is excavated to a position that will become the bottom surface of the rapple concrete to be constructed later, and the first floor attachment surface S1 is constructed. Here, the retaining wall 10 has a pair of long sides 12A, 12B and a pair of short sides 14A, 14B in plan view.

The first basement surface S1 is constructed so that its planar shape is rectangular, similar to the planar shape of the earth retaining wall 10, and the first basement surface S1 is constructed so that the corresponding sides of the rectangles of the first basement surface S1 and the earth retaining wall 10 face each other. Here, of the ground G in the illustrated example, the ground shallower than the first basement surface S1 is assumed to be self-supporting to a certain extent, and the ground is excavated with a relatively high slope gradient. Therefore, the slope gradient during excavation changes depending on the self-supporting nature of the ground G.

Below the first flooring surface S1, there is a hard support layer that will support the building that will be constructed above the rapple concrete that will be applied later. In other words, in ground conditions where such hard ground exists at a relatively shallow depth, excavation is performed down to the hard ground to construct the first flooring surface S1 (the above is Process A).

Next, as shown in Figures 1A and 1B, a central rapple concrete 20 of approximately the same dimensions and shape as the first floor attachment surface S1 is constructed on top of the first floor attachment surface S1, which is rectangular in plan view. With this construction, as shown in Figure 1A, the plan view shape of the retaining wall 10 and the plan view shape of the central rapple concrete 20 are both rectangular, and the central rapple concrete 20 is constructed so that the corresponding sides of each rectangle (long sides 12A, 22A, long sides 12B, 22B, short sides 14A, 24A, short sides 14B, 24B) face each other. Here, the foundation of a building (not shown) will be constructed on the top surface of the rapple concrete, including the central rapple concrete 20.

In the illustrated example, the retaining wall 10 and the central rappel concrete 20 have similar shapes in plan view, but they may be approximately similar or may not be similar (above, Process B).

Next, as shown in Figures 2A and 2B, in the plan view shape of the retaining wall 10, the ground between the two side surfaces 22A, 22B of the central ruffle concrete 20 corresponding to the two long sides 12A, 12B of the rectangle and the side surfaces of the retaining wall 10 corresponding to the two long sides 12A, 12B is excavated intermittently in plan view to a position that will be the bottom surface of the ruffle concrete, and multiple second floor attachment surfaces S2 are constructed.

In the illustrated example, three second floor attachment surfaces S2 are simultaneously constructed intermittently on both of the ground between the two side surfaces 22A, 22B of the central ruffle concrete 20 and the side surface of the earth retaining wall 10. Here, after the three second floor attachment surfaces S2 are constructed intermittently on the ground between one side surface 22A of the central ruffle concrete 20 and the side surface of the earth retaining wall 10, three second floor attachment surfaces S2 may then be constructed intermittently on the ground between the other side surface 22B and the side surface of the earth retaining wall 10 (above, step C).

Next, as shown in Figures 2A and 2B, on each of the three intermittently constructed second floor attachment surfaces S2, a strut ruffle concrete 30A is constructed to connect the side 22A of the central ruffle concrete 20 to the side 12A of the retaining wall 10, and to connect the side 22B of the central ruffle concrete 20 to the side 12B of the retaining wall 10.

In this way, by connecting the sides 22A, 22B of the central ruffle concrete 20 and the opposing sides 12A, 12B of the earth retaining wall 10 with multiple (three in the illustrated example) strut ruffle concretes 30A that are intermittently constructed, each strut ruffle concrete 30A functions as a strut, suppressing the inward deformation of each side corresponding to the long sides 12A, 12B of the earth retaining wall 10. Also, by supporting the sides corresponding to the long sides 12A, 12B, which have a larger amount of displacement, with the strut ruffle concrete 30A first compared to the sides corresponding to the short sides 14A, 14B of the earth retaining wall 10, construction safety is improved (above, step D).

Next, as shown in Figures 3A and 3B, step C is carried out to excavate the ground between the intermittently constructed strut ruffle concretes 30A to a position that will become the bottom surface of the ruffle concrete, and construct multiple second floor attachment surfaces S2, and then step D is carried out to construct the following strut ruffle concretes 30B on top of each of the constructed second floor attachment surfaces S2.

As described above, steps C and D are sequentially repeated between the side surfaces corresponding to the long sides 12A, 12B of the retaining wall 10 and the corresponding side surfaces 22A, 22B of the central ruffle concrete 20, so that alternating, continuous strut ruffle concrete 30A, 30B is constructed between the side surfaces 22A, 22B of the central ruffle concrete 20 and the side surfaces corresponding to the long sides 12A, 12B of the retaining wall 10.

Next, as shown in FIG. 4, in the plan view shape of the retaining wall 10, the ground between the two side surfaces 24A, 24B of the central ruffle concrete 20 corresponding to the remaining two short sides 14A, 14B and the side surfaces of the retaining wall 10 corresponding to the two short sides 14A, 14B is excavated intermittently in plan view to a position that will be the bottom surface of the ruffle concrete, and multiple second floor attachment surfaces S2 are constructed (this is the end of process C).

Next, on each of the three intermittently constructed second floor attachment surfaces S2, a strut ruffle concrete 40A is constructed to connect the side 24A of the central ruffle concrete 20 to the side 14A of the retaining wall 10, and also to connect the side 24B of the central ruffle concrete 20 to the side 14B of the retaining wall 10 (this is process D).

Then, as shown in FIG. 5, step C is carried out to excavate the ground between the intermittently constructed strut ruffle concretes 40A to a position that will become the bottom surface of the ruffle concrete, and construct multiple second floor attachment surfaces S2, and step D is carried out to construct the following strut ruffle concretes 40B on top of each of the constructed second floor attachment surfaces S2.

As described above, steps C and D are sequentially repeated between the sides corresponding to the short sides 14A, 14B of the retaining wall 10 and the corresponding sides 24A, 24B of the central ruffle concrete 20, so that alternating continuous strut ruffle concrete 40A, 40B are constructed between the sides 24A, 24B of the central ruffle concrete 20 and the sides corresponding to the short sides 14A, 14B of the retaining wall 10.

Then, the ground at the remaining four corners is excavated to construct the second floor surface S2, and strut ruffle concrete 50, which is corner ruffle concrete, is also constructed here.

By carrying out the above construction, a rapple concrete unit 60 consisting of a central rapple concrete 20 and multiple strut rapple concretes 30, 40, 50 is constructed over the entire enclosed area A inside the retaining wall 10.

The construction method for rapple concrete shown in the figure makes it possible to construct rapple concrete 60 with high construction safety inside the enclosed area A surrounded by the planar retaining wall 10, without the need to install wales and struts.

The illustrated example shows a method of constructing the strut rapple concrete starting from the side corresponding to the long sides 12A, 12B of the retaining wall 10, but the strut rapple concrete may be constructed starting from the side corresponding to the short sides 14A, 14B of the retaining wall 10, or the strut rapple concrete may be constructed simultaneously from each side corresponding to the long sides 12A, 12B and the short sides 14A, 14B to all sides 22A, 22B, 24A, 24B of the corresponding central rapple concrete 20.

[Method of constructing rapple concrete according to the second embodiment]
Next, an example of a construction method of the rapple concrete according to the second embodiment will be described with reference to Fig. 6 to Fig. 9. Here, Fig. 6 to Fig. 9 are process diagrams showing an example of a construction method of the rapple concrete according to the second embodiment in plan view.

The construction method of the rapple concrete shown in the figure differs from the construction method of the rapple concrete according to the first embodiment in that the planar shape of the central rapple concrete 20A constructed inside the retaining wall 10A and its enclosed area A is a distorted planar shape that is a unit shape of polygons and curves instead of a rectangular shape in plan.

As shown in FIG. 6, the retaining wall 10A has multiple straight sections and multiple curved sections, with their lengths set in the order of t1 to t6. Inside the retaining wall 10A, a first floor attachment surface S1 having a planar shape similar to the planar shape of the retaining wall 10A is constructed (Step A), and a central ruffle concrete 20A is constructed on top of the first floor attachment surface S1 (Step B).

Between each side 16A to 16F of the retaining wall 10A corresponding to each length t1 to t6 and each side 26A to 26F of the central ruffle concrete 20A corresponding to each side 16A to 16F, sections X1 to X6 are provided for constructing the strut ruffle concrete.

In the illustrated example, as shown in FIG. 7, the strut ruffle concrete is constructed from the X1 section, which has the longest planar length in the retaining wall 10A, and the four second floor attachment surfaces S2 are intermittently constructed simultaneously or sequentially in the ground between the side surface 26A of the central ruffle concrete 20A and the side surface 16A of the retaining wall 10A (step C).

Next, as shown in FIG. 7, strut ruffle concrete 70A is constructed on each second floor surface S2 to connect the side surface 26A of the central ruffle concrete 20A to the side surface 16A of the retaining wall 10A (step D).

Next, as shown in FIG. 8, step C is carried out to excavate the ground between the intermittently constructed strut ruffle concretes 70A to a position that will become the bottom surface of the ruffle concrete, and construct multiple second floor attachment surfaces S2, and then step D is carried out to construct the following strut ruffle concretes 70B on top of each of the constructed second floor attachment surfaces S2.

As described above, steps C and D are sequentially repeated between the side surface corresponding to the longest side 16A of the retaining wall 10A and the corresponding side surface 26A of the central ruffle concrete 20A, so that alternating continuous strut ruffle concrete 70A, 70B are constructed between the side surface 26A of the central ruffle concrete 20A and the side surface corresponding to the longest side 16A of the retaining wall 10A.

Next, as shown in FIG. 9, steps C and D are repeated in the order of the longest sides of the retaining wall 10A, from section X2 corresponding to side 16B to section X6 corresponding to side 16F, to construct the leading strut rapple concrete 80A in each section, and then the trailing strut rapple concrete 80B, thereby constructing a rapple concrete unit 90 consisting of a central rapple concrete 20A and multiple strut rapple concretes 70, 80 over the entire enclosed area A inside the retaining wall 10A.

The construction method for rapple concrete shown in the figure makes it possible to construct rapple concrete 90 with high construction safety, even inside the enclosed area A surrounded by the retaining wall 10A, which has a distorted planar shape and is planarly expansive, while eliminating the need to install wales and struts.

The illustrated example shows a method of constructing strut rupple concrete on the corresponding sides of the retaining wall 10A in order of the length of the sides, but strut rupple concrete may be constructed regardless of the length of the sides, or strut rupple concrete may be constructed simultaneously over the entire area of the retaining wall 10A.

The present invention is not limited to the configuration shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, changes can be made without departing from the spirit of the present invention, and can be determined appropriately according to the application form.

10, 10A: Retaining wall 12A, 12B: Long side (side)
14A, 14B: Short sides (sides)
16A, 16B, 16C, 16D, 16E, 16F: Sides
20, 20A: central rapple concrete 22A, 22B: long side (side)
24A, 24B: Short sides (sides)
26A, 26B, 26C, 26D, 26E, 26F: sides (sides)
30, 30A, 30B: Strut rapple concrete 40, 40A, 40B: Strut rapple concrete 50: Strut rapple concrete (corner rapple concrete)
60: Rapple concrete unit (Rapple concrete)
70, 70A, 70B: Strut rapple concrete 80, 80A, 80B: Strut rapple concrete 90: Rapple concrete unit (Rapple concrete)
G: Ground A: Enclosed area S1: First floor surface S2: Second floor surface

Claims (3)

A process includes constructing an earth retaining wall on the ground, and excavating the ground in an area inside an enclosed area surrounded by the earth retaining wall and having a smaller planar dimension than the enclosed area to a position that will become the bottom surface of the rapple concrete to be constructed later, thereby constructing a first flooring surface;
Step B: constructing a center ruffle concrete on the first floor surface;
A step C of excavating the ground between the side of the central ruffle concrete and the retaining wall intermittently in a plan view to a position that is the bottom surface of the ruffle concrete to construct a plurality of second flooring surfaces;
and step D of constructing strut trupple concrete on the second floor surface;
This method of constructing rapple concrete is characterized in that by sequentially repeating steps C and D, a plurality of strut rapple concretes are constructed connecting the sides of the entire circumference of the central rapple concrete to the retaining wall, thereby constructing a rapple concrete unit consisting of the central rapple concrete and a plurality of the strut rapple concretes. In the B step, the planar shape of the earth retaining wall and the planar shape of the central ruffle concrete are both rectangular, and the central ruffle concrete is constructed so that corresponding sides of each rectangle face each other,
In the plan view shape of the retaining wall, the two side surfaces of the central ruffle concrete corresponding to the two long sides of the rectangle and the ground between the retaining wall corresponding to the two long sides are sequentially or simultaneously subjected to the steps C and D, thereby connecting the side surfaces and the retaining wall corresponding to the side surfaces with a plurality of the strut ruffle concretes,
Next, the method of constructing rapple concrete described in claim 1 is characterized in that the C and D steps are repeated sequentially or simultaneously on the ground between the two side surfaces of the central rapple concrete corresponding to the two short sides of the rectangle and the retaining wall corresponding to the two short sides, thereby connecting the side surfaces and the retaining wall corresponding to the side surfaces with a plurality of the strut rapple concretes. In the B step, the planar shapes of the retaining wall and the central ruffle concrete are both polygonal or polygonal and curved unit shapes, and the central ruffle concrete is constructed so that the corresponding sides of each face each other;
The method for constructing rapple concrete as described in claim 1, characterized in that steps C and D are repeated for the side of the central rapple concrete corresponding to the longest straight line or the longest curve in the plan view shape of the earth retaining wall and the ground between the side of the central rapple concrete corresponding to the side and the earth retaining wall corresponding to the side, thereby connecting the side and the earth retaining wall corresponding to the side with a plurality of the strut rapple concretes, and this construction is sequentially performed for the ground corresponding to the next longest straight line or curve in the earth retaining wall.

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