Construction method of rammed concrete

Abstract

To provide a construction method of rubble concrete capable of constructing rubble concrete without requiring installation of wales and short struts inside a planarly extending earth retaining wall.SOLUTION: A construction method of rubble concrete includes: an A step of constructing an earth retaining wall 10 on a ground G and excavating to a position becoming a bottom face of rubble concrete to be constructed to construct a first leveling work surface S1 inside the same; a B step of constructing center rubble concrete 20 on the same; a C step of intermittently excavating the ground between the lateral side of the center rubble concrete 20 and the earth retaining wall 10 in plan view to construct a plurality of second leveling work surfaces S2; and a D step of constructing strut rubble concrete 30 on the same. By sequentially repeating the C step and the D step, a plurality of strut rubble concretes 30, 40 connecting the lateral side of the center rubble concrete 20 and the earth retaining wall 10 are constructed, and a rubble concrete unit 60 comprising these is constructed.SELECTED DRAWING: Figure 2A

Description

Technical Field

[0001] The present invention relates to a method for constructing rubble concrete.

Background Art

[0002] For example, when constructing a building on a ground where there is a soft ground in a relatively shallow range of the surface layer and a hard ground exists below the soft ground, a method may be applied in which the soft ground is excavated and removed, rubble concrete is constructed, and a building is constructed on the rubble concrete. Here, the "soft ground" means a ground that does not have a supporting force for directly supporting the building in relation to the building to be constructed, and also means a ground that is liable to liquefy or a ground that is liable to subside such as consolidation settlement. On the other hand, the "hard ground" means a ground that has no risk of subsidence such as liquefaction or consolidation settlement and can support the building to be constructed. For example, a ground with an N-value of 15 or more (preferably 20 or more) in cohesive soil and a ground with an N-value of 30 or more in sandy soil can be regarded as hard ground. Therefore, when constructing rubble concrete on hard ground and supporting the weight of the building with the rubble concrete, the weight of the building is transmitted to the hard ground through the rubble concrete and is supported by the hard ground.

[0003] Rubble concrete replaces the excavated soft ground area with rubble concrete made of unreinforced concrete, unlike ground improvement that stirs and mixes the ground with cement. Since it is constructed with concrete with a suppressed unit price, such as using concrete with a design standard strength of about 18 N / mm 2 and using crushed stone mixed in the coarse aggregate, it is possible to construct a support layer with a strength equal to or higher than that of the hard ground on the hard ground while suppressing the construction cost compared to ground improvement that mixes cement-based solidifying materials into the ground or columnar ground improvement using improved piles.

[0004] By the way, when excavating soft ground, a retaining wall is constructed so as to surround the excavation area. As the soft ground is excavated, bracing is installed inside the retaining wall using H-shaped steel or the like, and a cross beam made of H-shaped steel or the like is installed between the opposing bracings, so that excavation of the soft ground is generally carried out while suppressing deformation of the retaining wall during excavation of the soft ground. At this time, due to the entanglement of a large number of cross beams in the excavation area, in addition to various temporary construction works such as excavation work deeper than the cross beam, the cross beam also becomes an obstacle to the construction of the foundation of the main building, resulting in problems such as a decrease in workability. In addition, since a large number of bracings and cross beams are installed, the time and labor costs required for temporary construction also become problems, and this problem becomes more prominent at large-scale sites where the excavation area extends over a wide area.

[0005] At the site where the above-described rample concrete is constructed, by developing a technology that can eliminate the need for installing bracings and cross beams that support the retaining wall, the support layer of the building can be raised at a lower cost than normal ground improvement construction, and the time required for temporary construction can be shortened by eliminating the bracings and cross beams, and the labor cost can be further reduced, which is desirable.

[0006] Here, Patent Document 1 proposes a rample concrete construction method in which a horizontal cross beam and a lagging pile are not provided on the retaining wall. This rample concrete construction method is a rample concrete construction method in which a retaining wall is constructed around the ground to be excavated, the ground is excavated once, the excavation is carried out along the retaining wall to the supporting ground, rample concrete is placed, and a foundation is constructed on it after the rample concrete has hardened. In this construction method, when excavating to the supporting ground, the ground to be excavated is divided into a required width in the horizontal direction along the retaining wall. The excavated ground is divided into Section A, Section B which is one section away from Section A, and Section C between Section A and Section B. The excavation order of the sections is Section A, Section B, Section C, and after excavating each section, rample concrete is placed, and then the construction proceeds to other sections, and excavation is carried out without providing a horizontal cross beam and a lagging pile on the retaining wall.

Prior Art Documents

Patent Documents

[0007] Patent Document 1 Japanese Patent Application Laid-Open No. 2013-122111 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] According to the method for constructing ripple concrete described in Patent Document 1, it is said that the installation of cross beams can be made unnecessary. However, since the construction area is divided into a plurality of sections in the lateral direction along the retaining wall, and ground excavation and placement of ripple concrete are sequentially performed for each section, although it can be applied to a construction site with a relatively narrow width and long in one direction, such as a horizontally long or vertically long construction area, it is difficult to construct ripple concrete while dividing it into a plurality of sections in this way without installing cross beams at a site having a certain extent of expansion in both the vertical and horizontal directions.

[0009] The present invention has been made in view of the above problems, and an object thereof is to provide a method for constructing ripple concrete capable of constructing ripple concrete without the need for belly rising and installation of cross beams inside an enclosed area surrounded by a retaining wall having a planar expansion. MEANS FOR SOLVING THE PROBLEMS

[0010] To achieve the above object, one aspect of the method for constructing ripple concrete according to the present invention is as follows. Construct a retaining wall on the ground, and in the inside of the enclosed area surrounded by the retaining wall, excavate the ground in an area having a smaller planar dimension than the enclosed area to a position that becomes the bottom surface of the ripple concrete to be constructed later to construct a first leveling surface (Step A). Construct central ripple concrete on the first leveling surface (Step B). Intermittently excavate the ground between the side of the central ripple concrete and the retaining wall in plan view to a position that becomes the bottom surface of the ripple concrete to construct a plurality of second leveling surfaces (Step C). Step D of constructing strut-lap concrete on the second floor slab surface. By sequentially repeating the above Step C and Step D, a plurality of the strut-lap concretes connecting the side of the entire circumference of the central lap concrete and the retaining wall are constructed, and a lap concrete unit composed of the central lap concrete and the plurality of the strut-lap concretes is constructed.

[0011] According to this aspect, after excavating the ground in a region with relatively small plan dimensions inside the retaining wall to construct the first floor slab surface and constructing the central lap concrete thereon, the ground between the central lap concrete and the retaining wall is intermittently excavated to construct a plurality of second floor slab surfaces, and a plurality of strut-lap concretes are constructed on each second floor slab surface, and the entire area between the side surface of the central lap concrete and the retaining wall is connected by the plurality of strut-lap concretes, so that it becomes possible to construct lap concrete while making it unnecessary to install a bulkhead and a cross beam inside the surrounded area surrounded by the retaining wall having a planar spread.

[0012] The area of the first floor slab surface relative to the area of the surrounded area surrounded by the retaining wall can be set according to the strength of the excavated ground, the excavation depth, etc. For example, if the ground has a certain degree of self-supporting property, the ground can be excavated in a state having an excavation wall close to vertical, and if the ground has a low self-supporting property, the ground can be excavated in a state having a low slope gradient, so the area of the first floor slab surface becomes relatively small.

[0013] For example, inside an enclosed area surrounded by retaining walls, a first floor surface with a smaller dimension than the enclosed area and having a similar shape or a substantially similar shape to the enclosed area is constructed, and central ruffled concrete is constructed thereon. Here, the "central ruffled concrete" refers to the ruffled concrete that is constructed in advance at the center or substantially at the center of the enclosed area surrounded by the retaining walls. By constructing the central ruffled concrete in advance, the side surfaces around it and the entire retaining walls around it can be connected with strut ruffled concrete, for example, simultaneously or sequentially. For example, when sequentially constructing the strut ruffled concrete, it is preferable to construct the strut ruffled concrete in order from the area where the retaining wall is likely to deform.

[0014] Also, the "strut ruffled concrete" means the ruffled concrete that connects both the side surface of the central ruffled concrete and the retaining wall facing this side surface like a cut beam, and can also be referred to as a virtual cut beam formed by the ruffled concrete. However, the strut ruffled concrete remains ruffled concrete and, while having a function of supporting the retaining wall similar to that of a general cut beam, is ultimately a part of the ruffled concrete unit constructed over the entire inner area of the enclosed area surrounded by the retaining walls.

[0015] Also, in another aspect of the method for constructing ruffled concrete according to the present invention, In the step B, the plan view shapes of both the retaining wall and the central ruffled concrete are rectangles, and the central ruffled concrete is constructed such that the corresponding sides of the respective rectangles face each other. Among the plan view shapes of the retaining wall, by repeating the step C and the step D sequentially or simultaneously with respect to the ground between the two side surfaces of the central ruffled concrete corresponding to the two long sides of the rectangle and the retaining walls corresponding to the two long sides, the side surfaces and the retaining walls corresponding to the side surfaces are connected with a plurality of the strut ruffled concrete. Next, by repeating the C process and the D process sequentially or simultaneously with respect to the two side surfaces of the central rumple concrete corresponding to the two short sides of the rectangle and the ground between the retaining walls corresponding to the two short sides, the side surface and the retaining wall corresponding to the side surface are connected by a plurality of the strut rumple concretes.

[0016] According to this aspect, after constructing the central rumple concrete such that the planar shape of the retaining wall and the planar shape of the central rumple concrete are both rectangular and the corresponding sides of the respective rectangles face each other, the strut rumple concrete is constructed in advance with respect to the ground between the two side surfaces of the central rumple concrete corresponding to the two long sides of the rectangle where the amount of deformation of the retaining wall is the largest and the retaining wall, so that it is possible to realize the construction of the rumple concrete with high construction safety without requiring a cut beam.

[0017] Here, the "rectangular shape in plan view" includes not only a rectangular shape and a square shape in plan view, but also a shape in which the corner portions are chamfered in a slightly tapered shape (therefore, strictly speaking, a polygon other than a rectangle). Further, "repeating the C process and the D process simultaneously" means that, for example, the second floor-forming surfaces are simultaneously constructed in the ground in the region corresponding to the long side by performing the operation of intermittently constructing a plurality of second floor-forming surfaces simultaneously with a plurality of heavy machines, and for the simultaneously constructed second floor-forming surfaces, for example, the strut rumple concrete is constructed simultaneously using a plurality of concrete pump trucks.

[0018] Further, in another aspect of the method for constructing rumple concrete according to the present invention, In the B process, the planar shapes of the retaining wall and the central rumple concrete are both a polygon or a unit shape of a polygon and a curve, and the central rumple concrete is constructed such that the corresponding sides face each other. Among the planar view shapes of the retaining wall, for the ground between the side surface of the central rumple concrete corresponding to the longest straight line or the longest curve, and the retaining wall corresponding to the side surface, by repeating the C process and the D process, a plurality of the strut rumple concretes connect the side surface and the retaining wall corresponding to the side surface, and this construction is sequentially performed on the ground corresponding to the next longest straight line or curve in the retaining wall.

[0019] According to this aspect, even when the planar view shapes of the retaining wall and the central rumple concrete are various shapes other than a rectangle, after constructing the central rumple concrete so that the corresponding sides of the retaining wall and the central rumple concrete face each other, for the ground between the side surface of the central rumple concrete corresponding to the longest straight line or the longest curve in the planar view shape of the retaining wall and the retaining wall corresponding to this, the strut rumple concrete is constructed in advance, and the strut rumple concretes are sequentially constructed in the order of the lengths of the straight lines and curves. In this way, by sequentially constructing the strut rumple concretes according to the magnitude of the deformation amount of the retaining wall, it is possible to realize the construction of the rumple concrete with high construction safety without requiring a cut beam.

Effect of the Invention

[0020] As can be understood from the above description, according to the construction method of the rumple concrete of the present invention, it is possible to construct the rumple concrete without requiring the installation of a belly rise and a cut beam inside the surrounded area surrounded by a retaining wall that spreads planarly.

Brief Description of the Drawings

[0021]

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[0022] Hereinafter, an example of the construction method of the ripple concrete according to each embodiment will be described with reference to the accompanying drawings. In the present specification and the drawings, substantially the same components may be denoted by the same reference numerals, and redundant descriptions may be omitted.

[0023] [Construction Method of Ripple Concrete According to the First Embodiment] First, with reference to FIGS. 1 to 5, an example of a method for constructing ripple concrete according to the first embodiment will be described. Here, FIGS. 1A, 2A, 3A, 4, and 5 are process diagrams showing an example of the method for constructing ripple concrete according to the first embodiment in a plan view in order, and FIGS. 1B, 2B, and 3B are BB cross-sectional views of FIGS. 1A, 2A, and 3A, respectively.

[0024] The retaining wall 10 in the illustrated example is constructed in a rectangular shape in plan view on the ground G at the construction site. Here, the retaining wall 10 is applied with a suitable form such as a parent pile cross-sheet pile wall, a steel sheet pile wall, a soil-cement column wall (SMW wall), a steel pipe sheet pile wall, a cast-in-place pile wall, etc., depending on the properties of the ground G (layer state (clay layer, sandy layer, gravel layer, etc.), strength of each layer, presence or absence of groundwater and water level), etc.

[0025] As shown in FIGS. 1A and 1B, first, the ground in a region inside the surrounded area A surrounded by the retaining wall 10 in a rectangular shape in plan view and having a smaller plan dimension than the surrounded area A is excavated to a position that will become the bottom surface of the subsequently constructed ripple concrete, and the first leveling 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.

[0026] The first leveling surface S1 is constructed so that its plan view shape is rectangular in the same manner as the plan view shape of the retaining wall 10, and the first leveling surface S1 is constructed so that the corresponding sides of the rectangles of the first leveling surface S1 and the retaining wall 10 face each other. Here, among the ground G in the illustrated example, it is assumed that the ground above the first leveling surface S1 is a ground with a certain degree of self-supporting property, and the ground is excavated at a relatively steep slope. Therefore, the slope during excavation changes according to the self-supporting property of the ground G.

[0027] Below the first leveling surface S1, there is a hard support layer that supports the building to be constructed above the subsequently constructed ripple concrete. That is, in the ground condition where such a hard ground exists at a relatively shallow depth, the ground is excavated to the hard ground to construct the first leveling surface S1 (the above is Process A).

[0028] Next, as shown in FIGS. 1A and 1B, a central ruffled concrete 20 having substantially the same dimensions and the same shape as the first flooring surface S1 is constructed on the first flooring surface S1 having a rectangular shape in plan view. By this construction, as shown in FIG. 1A, both the plan view shape of the retaining wall 10 and the plan view shape of the central ruffled concrete 20 are rectangular, and the central ruffled concrete 20 is constructed such that the corresponding sides (long sides 12A, 22A, long sides 12B, 22B, short sides 14A, 24A, short sides 14B, 24B) of the respective rectangles face each other. Here, a foundation of a building (not shown) will be constructed on the top end surface of the ruffled concrete including the central ruffled concrete 20.

[0029] The plan view shapes of the retaining wall 10 and the central ruffled concrete 20 in the illustrated example are similar shapes, but they may be substantially similar shapes or may not be similar shapes (the above is Process B).

[0030] Next, as shown in FIGS. 2A and 2B, in the plan view shape of the retaining wall 10, for the ground between the two side surfaces 22A, 22B of the central ruffled 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, respectively, in plan view, excavation is intermittently performed to a position that becomes the bottom surface of the ruffled concrete to construct a plurality of second flooring surfaces S2.

[0031] In the illustrated example, three second flooring surfaces S2 are simultaneously constructed intermittently on both the ground between the two side surfaces 22A, 22B of the central ruffled concrete 20 and the side surface of the retaining wall 10. Here, after intermittently constructing three second flooring surfaces S2 on the ground between one side surface 22A of the central ruffled concrete 20 and the side surface of the retaining wall 10, then, three second flooring surfaces S2 may be intermittently constructed on the ground between the other side surface 22B and the side surface of the retaining wall 10 (the above is Process C).

[0032] Next, as shown in FIGS. 2A and 2B, strut-ripple concretes 30A are constructed to connect the side surfaces 22A of the central-ripple concrete 20 and the side surfaces 12A of the retaining walls 10, and also to connect the side surfaces 22B of the central-ripple concrete 20 and the side surfaces 12B of the retaining walls 10, respectively, on the three intermittently constructed second flooring surfaces S2.

[0033] In this way, by connecting the side surfaces 22A and 22B of the central-ripple concrete 20 and the corresponding side surfaces 12A and 12B of the retaining walls 10 with a plurality (three in the illustrated example) of intermittently constructed strut-ripple concretes 30A, each strut-ripple concrete 30A functions as a cut beam, and deformation inward of each side surface corresponding to the long sides 12A and 12B of the retaining wall 10 can be suppressed. Further, by previously supporting, with the strut-ripple concretes 30A, the side surfaces corresponding to the long sides 12A and 12B with a larger displacement amount compared to the side surfaces corresponding to the short sides 14A and 14B of the retaining wall 10, the construction safety is enhanced (the above is Process D).

[0034] Next, as shown in FIGS. 3A and 3B, a Process C is performed in which the ground between a plurality of intermittently constructed strut-ripple concretes 30A is excavated to a position that becomes the bottom surface of the ripple concrete to construct a plurality of second flooring surfaces S2, and a Process D is performed in which subsequent strut-ripple concretes 30B are constructed on each of the constructed second flooring surfaces S2.

[0035] As described above, by sequentially repeating Process C and Process D between the side surfaces corresponding to the long sides 12A and 12B of the retaining wall 10 and the side surfaces 22A and 22B of the central-ripple concrete 20 corresponding thereto, continuous strut-ripple concretes 30A and 30B are alternately constructed between the side surfaces 22A and 22B of the central-ripple concrete 20 and the side surfaces corresponding to the long sides 12A and 12B of the retaining wall 10.

[0036] Next, as shown in Fig. 4, among the planar view shapes of the retaining wall 10, for the ground between the two side faces 24A and 24B of the central rample concrete 20 corresponding to the remaining two short sides 14A and 14B, and the side faces of the retaining wall 10 corresponding to the two short sides 14A and 14B, respectively, intermittently in the planar view, excavation is carried out to the position that becomes the bottom surface of the rample concrete to construct a plurality of second bedding surfaces S2. (The above is Process C).

[0037] Next, on each of the three intermittently constructed second bedding surfaces S2, a strut rample concrete 40A that connects the side face 24A of the central rample concrete 20 and the side face 14A of the retaining wall 10, and also connects the side face 24B of the central rample concrete 20 and the side face 14B of the retaining wall 10 is constructed. (The above is Process D).

[0038] Then, as shown in Fig. 5, Process C of excavating the ground between the plurality of intermittently constructed strut rample concretes 40A to the position that becomes the bottom surface of the rample concrete to construct a plurality of second bedding surfaces S2 is carried out, and on each of the constructed second bedding surfaces S2, Process D of constructing a subsequent strut rample concrete 40B is carried out.

[0039] As described above, by sequentially repeating Process C and Process D between the side faces of the retaining wall 10 corresponding to the short sides 14A and 14B and the side faces 24A and 24B of the central rample concrete 20 corresponding thereto, alternately continuous strut rample concretes 40A and 40B are constructed between the side faces 24A and 24B of the central rample concrete 20 and the side faces of the retaining wall 10 corresponding to the short sides 14A and 14B.

[0040] Then, the ground at the remaining four corner portions is also excavated to construct a second bedding surface S2, and a strut rample concrete 50, which is a corner rample concrete, is also constructed here.

[0041] By the above construction, a ripple concrete unit 60 composed of a central ripple concrete 20 and a plurality of strut ripple concretes 30, 40, 50 is constructed over the entire enclosed area A inside the retaining wall 10.

[0042] According to the illustrated method of constructing the ripple concrete, inside the enclosed area A surrounded by the laterally extensive retaining wall 10, it is possible to construct the ripple concrete 60 with high construction safety while eliminating the need to install diaphragms and cross beams.

[0043] Here, in the illustrated example, the strut ripple concrete is constructed in order from the side surfaces corresponding to the long sides 12A, 12B of the retaining wall 10, but the strut ripple concrete may be constructed in order from the side surfaces corresponding to the short sides 14A, 14B of the retaining wall 10, or the strut ripple concrete may be constructed simultaneously over all side surfaces 22A, 22B, 24A, 24B of the corresponding central ripple concrete 20 from the respective side surfaces corresponding to the long sides 12A, 12B and the short sides 14A, 14B.

[0044] [Method of Constructing Ripple Concrete According to the Second Embodiment] Next, with reference to FIGS. 6 to 9, an example of the method of constructing the ripple concrete according to the second embodiment will be described. Here, FIGS. 6 to 9 are process diagrams showing an example of the method of constructing the ripple concrete according to the second embodiment in a plan view in order.

[0045] The illustrated method of constructing the ripple concrete is different from the method of constructing the ripple concrete according to the first embodiment in that the plan view shape of the retaining wall 10A and the central ripple concrete 20A constructed inside its enclosed area A is a distorted plan view shape, which is a unit shape of a polygon and a curve instead of a rectangular shape in plan view.

[0046] As shown in Fig. 6, the retaining wall 10A has a plurality of straight sections and a plurality of curved sections, and their lengths are set to be longer in the order of t1 to t6. Inside it, a first floor surface S1 having a planar shape similar to the planar shape of the retaining wall 10A in plan view is constructed (Step A), and a central ruckle concrete 20A is constructed on the first floor surface S1 (Step B).

[0047] Between each side surface 16A to 16F of the retaining wall 10A corresponding to each length t1 to t6, and each side surface 26A to 26F of the central ruckle concrete 20A corresponding to each side surface 16A to 16F, X1 sections to X6 sections for constructing strut ruckle concrete are respectively provided.

[0048] Also in the illustrated example, as shown in Fig. 7, it is decided to construct strut ruckle concrete from the X1 section with the longest length in plan view of the retaining wall 10A, and in the ground between the side surface 26A of the central ruckle concrete 20A and the side surface 16A of the retaining wall 10A, four second floor surfaces S2 are intermittently constructed simultaneously or sequentially (Step C).

[0049] Next, as shown in Fig. 7, a strut ruckle concrete 70A connecting the side surface 26A of the central ruckle concrete 20A and the side surface 16A of the retaining wall 10A is constructed on each second floor surface S2 (Step D).

[0050] Next, as shown in Fig. 8, a Step C of excavating the ground between a plurality of intermittently constructed strut ruckle concretes 70A to the position of the bottom surface of the ruckle concrete to construct a plurality of second floor surfaces S2 is performed, and a Step D of constructing a subsequent strut ruckle concrete 70B is performed on each constructed second floor surface S2.

[0051] As described above, between the side surface corresponding to the longest side 16A of the retaining wall 10A and the side surface 26A of the central corrugated concrete 20A corresponding thereto, by sequentially repeating the C step and the D step, between the side surface 26A of the central corrugated concrete 20A and the side surface corresponding to the longest side 16A of the retaining wall 10A, the strut corrugated concretes 70A and 70B that are alternately continuous are constructed.

[0052] Next, as shown in FIG. 9, in the order of the X2 section corresponding to the side 16B to the X6 section corresponding to the side 16F, which is the order of the sides of the retaining wall 10A from the longest, the C step and the D step are repeated, and in each section, the preceding strut corrugated concrete 80A is constructed, and then the subsequent strut corrugated concrete 80B is constructed, whereby the corrugated concrete unit 90 composed of the central corrugated concrete 20A and the plurality of strut corrugated concretes 70 and 80 is constructed over the entire surrounded area A inside the retaining wall 10A.

[0053] According to the method for constructing the corrugated concrete shown in the figure, even inside the surrounded area A surrounded by the retaining wall 10A, which has a distorted planar shape and spreads out planarly, it is possible to construct the corrugated concrete 90 with high construction safety while eliminating the need for the erection of webs and crossbeams.

[0054] Here, in the illustrated example, in the retaining wall 10A, it is a method of constructing the strut corrugated concrete on the corresponding side surface in the order of the sides from the longest, but regardless of the side length, the strut corrugated concrete may be constructed, or the strut corrugated concrete may be constructed simultaneously over the entire area of the retaining wall 10A.

[0055] Other embodiments in which other components are combined with the configurations and the like described in the above embodiments may also be possible, and the present invention is not limited to the configurations shown here at all. In this regard, it can be changed without departing from the gist of the present invention, and it can be appropriately determined according to the application form.

Explanation of Reference Numerals

[0056] 10, 10A: Mountain retaining wall 12A, 12B: Long side (side face) 14A, 14B: Short side (side face) 16A, 16B, 16C, 16D, 16E, 16F: Side (side face) 20, 20A: Central ruffled concrete 22A, 22B: Long side (side face) 24A, 24B: Short side (side face) 26A, 26B, 26C, 26D, 26E, 26F: Side (side face) 30, 30A, 30B: Strut ruffled concrete 40, 40A, 40B: Strut ruffled concrete 50: Strut ruffled concrete (corner ruffled concrete) 60: Ruffled concrete unit (ruffled concrete) 70, 70A, 70B: Strut ruffled concrete 80, 80A, 80B: Strut ruffled concrete 90: Ruffled concrete unit (ruffled concrete) G: Ground A: Enclosed area S1: First flooring surface S2: Second flooring surface

Claims

1. Construct a retaining wall on the ground. Inside the enclosed area surrounded by the retaining wall, excavate the ground in an area with a smaller plan dimension than the enclosed area to the position that will become the bottom surface of the subsequent rumple concrete to construct a first bedding surface, step A; Construct central rumple concrete on the first bedding surface, step B; Intermittently excavate the ground between the side of the central rumple concrete and the retaining wall in plan view to the position that will become the bottom surface of the rumple concrete to construct a plurality of second bedding surfaces, step C; Have step D of constructing strut rumple concrete on the second bedding surface, By sequentially repeating step C and step D, a plurality of the strut rumple concretes connecting the side of the entire circumference of the central rumple concrete and the retaining wall are constructed, and a rumple concrete unit composed of the central rumple concrete and the plurality of the strut rumple concretes is constructed. A method for constructing rumple concrete, characterized in that.

2. In step B, both the plan view shape of the retaining wall and the plan view shape of the central rumple concrete are rectangular, and the central rumple concrete is constructed so that the corresponding sides of the respective rectangles face each other, Among the plan view shapes of the retaining wall, for the two side surfaces of the central rumple concrete corresponding to the two long sides of the rectangle and the ground between the retaining wall corresponding to the two long sides, by sequentially or simultaneously repeating step C and step D, a plurality of the strut rumple concretes connect the side surface and the retaining wall corresponding to the side surface, Next, for the two side surfaces of the central rumple concrete corresponding to the two short sides of the rectangle and the ground between the retaining wall corresponding to the two short sides, by sequentially or simultaneously repeating step C and step D, a plurality of the strut rumple concretes connect the side surface and the retaining wall corresponding to the side surface. The method for constructing rumple concrete according to claim 1, characterized in that.

3. In step B, both the plan view shape of the retaining wall and the central rumple concrete are polygonal or a unit shape of a polygon and a curve, and the central rumple concrete is constructed so that the corresponding sides face each other, Among the planar shapes of the retaining wall, with respect to the ground between the side surface of the central ruckle concrete corresponding to the longest straight line or the longest curve, and the retaining wall corresponding to the side surface, by repeating the C process and the D process, a plurality of the strut ruckle concretes connect the side surface and the retaining wall corresponding to the side surface, and this construction is sequentially performed on the ground corresponding to the next longest straight line or curve in the retaining wall. The method for constructing ruckle concrete according to claim 1, characterized in that.

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