KR101915431B1 - Retaining wall for reinforcement and planting - Google Patents

Abstract

A retaining wall for reinforcing planting comprises: a plurality of bottom lumbers disposed at a predetermined interval and having concave grooves in an upper front portion and a lower front portion; a plurality of laminated wooden plates extending in the longitudinal direction to be disposed in the vertical direction, wherein fastening grooves are formed in the upper portion and the lower portion to be inserted into the concave grooves so as to be fastened in the direction perpendicular to the bottom lumbers; a bonding material installed in every interval between the plurality of laminated wooden plates to form bonding material vertical lines while the plurality of laminated wooden plates are laminated; and a planting block disposed in front of the laminated wooden plates and installed between the bonding material vertical lines in a plurality of rows and columns. Accordingly, the lumbers are used to construct a retaining wall, thereby increasing bearing power and constructability, securing cost efficiency, and facilitating the growth of vegetation.

Description

{RETAINING WALL FOR REINFORCEMENT AND PLANTING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall, and more particularly, to a greening reinforcing retaining wall which is constructed of a retaining wall by using wood to improve a supporting force and a workability, is economical and facilitates plant vegetation.

In general, the retaining wall is constructed by stacking concrete blocks mainly in multi-tiers in order to prevent the collapse that can occur when the slope of the ground surface is made steep. When formed only as a concrete block structure, it does not harmonize with nature, There is a problem that vegetation of the plant is difficult.

As a result, a method of constructing a retaining wall using wood has also been proposed. For example, in Patent Document 1, a plurality of notch materials are stacked, and a front transverse member and a rear transverse member which are seated on both ends of a notch material and connect adjacent notch materials are laminated. The front and rear end portions of the notch material, One end of the front transverse member is positioned in any one of the front end lower seating grooves of the notch member while being seated in any one of the front end upper seating grooves of the notch member, The other end of the transverse member is positioned in any one of the upper seating grooves of the notch adjacent to the other side of the notch material and positioned in any one of the front lower seating grooves of another notch located at the upper end of the front transverse member, Is disclosed in a wooden frame retaining wall which is seated in the same structure as the front transverse member.

However, in the patent document 1, when the slope is applied to a sloping slope, the entire retaining wall must be inclined to a sloping slope, so that the slope must be installed in a very unstable state. In addition, there is a problem in that planting material is practically difficult, and a retaining wall is constructed by using wood, so that it is not possible to record by vegetable planting.

Korean Patent Registration No. 10-0771844 (published on October 25, 2007)

SUMMARY OF THE INVENTION The present invention has been made to solve all of the problems described above, and it is an object of the present invention to provide a greening reinforcing retaining wall which is constructed of a retaining wall by using wood to improve the supporting force and workability, is economical and facilitates plant vegetation.

The present invention relates to a floor structure, comprising: a plurality of floor arcs arranged at regular intervals and having concave grooves formed on the upper and lower sides; And a fastening groove is formed in each of the upper and lower portions extending in the longitudinal direction. The fastening rod is inserted into the insertion hole formed at the opposite end portions, A plurality of laminated wood plates for connecting adjacent laminated wood plates, sequentially stacking the laminated wood plates in the up and down direction and supporting the soil layer formed by filling the soil at the rear side; And a plurality of vertically arranged connecting members are vertically stacked on the front and rear supporting plates. The front and rear supporting plates vertically installed are connected to each other at the center, and the connecting bars are inserted into the connecting grooves of the upper and lower laminated wood plates A joining material for supporting the upper and lower laminated wood plates; And a recording space in which a support arm is protruded from both sides of the front side and a recording part is inserted in front of the side between the both side support arms is formed, A main body part formed in the rear of the vehicle and connected to the recording space and formed with a soil-covered space to be filled with soil, a coconut fiber mixed with a conception, a seed or a seedling, And a recording block including a soil portion filled with a gravel-like material in a gravel-like space, wherein the floor gates are arranged at regular intervals on an upper part of the soil layer, and the gravel- And a plurality of laminated wooden boards are stacked on the bottom wooden boards with a bonding material interposed therebetween, The soil is filled in the process is repeated that the soil formation provides a recording reinforced retaining wall, it characterized in that a plurality of soil layers are sequentially formed.

According to the present invention, a retaining wall is constructed by using wood to improve the supporting force and workability, is economical, and has an effect of facilitating plant vegetation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a configuration for a minimum layer construction of a retaining wall according to an embodiment of the present invention; FIG.
FIG. 2A and FIG. 2B are views showing bottom legs according to an embodiment of the present invention.
FIG. 3 is a view showing a state in which a floor anvil, a laminated wooden board, and a binder are assembled according to an embodiment of the present invention.
4 is a perspective view of a binder according to an embodiment of the present invention.
FIG. 5A is a view illustrating a process in which a laminated wood board according to an embodiment of the present invention is stacked with a binder interposed therebetween, and FIG. 5B shows a state in which lamination is completed.
FIG. 6A is a front view of the assembled retaining wall according to the embodiment of the present invention, and FIG. 6B is a rear view of the retaining wall.
FIG. 7A is a view showing a state in which the bottom surface of a retaining wall is filled with gravel, and FIG. 7B is a view showing a retaining wall having two ground layers.
8A is an exploded perspective view of a recording block according to an exemplary embodiment of the present invention, and FIG.
9 is a diagram illustrating a configuration of a recording unit according to an embodiment of the present invention.
10 is a view showing a retaining wall in which recording blocks are stacked according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

The recreation reinforcing retaining wall according to the present invention is constructed by using a wood to construct a retaining wall to improve the supporting force and the workability and is economical and easy to vegetate the plant. The recreation reinforcement wall comprises a floor lining 100, a laminated wood plate 200, A recording block 400 and a support wood board 500 all or part of the same.

Referring to FIGS. 1 and 2B, the bottom 100 is made of a wood material having a rectangular cross section of wood, extends along the longitudinal direction, and has a plurality of spaced apart gaps As shown in Fig. The floor panel 100 has upper and lower grooves 110 formed vertically in the upper and lower portions thereof and protruding pieces 120 protruding from the bottom surface of the grooved grooves 110, The coupling grooves 210 are fastened to the protruding pieces 120 in a state where the lower part of the laminated wood plate 200 is inserted into the upper concave grooves 110 to prevent the laminated wood plate 200 from rocking. A pair of support protrusions 130 are formed on the front upper surface of the floor panel 100 so as to be spaced apart from each other and protrude upward and the lower grooves 312 and 322 formed on the lower surface of the front and rear support plates 310 and 320 of the coupling member 300, Is fastened to the support protrusions 130 so that the laminated wood plate 200 can be more firmly supported.

A transverse limb 150 having a height lower than that of the bottom limb 100 is connected between the adjacent bottom limb 100 and the bottom limb 100 in the lateral direction. The transverse joints 155 are protruded from both sides of the transverse shaft 150 and inserted into the concave grooves 110 under the bottom 100. The transverse shaft 150 has a plurality of recording blocks 400 Stacked.

Referring to FIG. 3, a plurality of bottom legs 100 having such a configuration are arranged in the longitudinal direction, and a laminated wood board 200 having a rectangular cross-section and having a rectangular cross section is interposed between the joining members 300 .

The laminated wood board 200 is formed extending in the longitudinal direction and arranged in the vertical direction. The insertion holes 220 are formed in both ends of the laminated wood board 200 in the horizontal direction. The insertion holes 220 of the plurality of adjacent laminated wood boards 200 The plurality of laminated wood plates 200 are connected in the horizontal direction. In addition, the laminated wood plate 200 has upper and lower coupling grooves 210, respectively, which are inserted into the concave grooves 110 and are fastened in the lateral direction orthogonal to the bottom plate 100. More specifically, in a state in which the lower portion of the laminated wood plate 200 is fitted into the concave groove 110, the coupling groove 210 is fastened to the protruded piece 120 to prevent the laminated wood plate 200 from swinging in the lateral direction. Thereafter, another laminated wooden board 200 is sequentially stacked on the laminated wood board 200 in the vertical direction, and the ground layer S is formed by filling the rear of the laminated wooden board 200 with the ground.

As described above, when the plurality of laminated wood plates 200 are arranged in the vertical direction and sequentially stacked, a binder 300 is interposed between the laminated wood plate 200 located below and the laminated wood plate 200 located thereabove It is possible to prevent the laminated wooden board 200 from moving and to further reinforce the supporting force against the ground layer.

4, the binder 300 is provided between the plurality of laminated wood plates 200, and includes front and rear support plates 310 and 320 vertically installed at front and rear sides, respectively, and front and rear support plates 310 and 320 Is connected to the connection bar 330. [0054]

5A and 5B, the connecting bars 330 are simultaneously inserted into the coupling grooves 210 of the upper and lower laminated wood plates 200 to support the upper and lower laminated wood plates 200. In addition, the joining material 300 arranged on the upper and lower sides is stacked so that the upper surface of the lower front and rear supporting plates 310 and 320 and the lower surfaces of the upper and lower rear supporting plates 310 and 320 are in contact with each other, Can be formed.

The thermoplastic elastic sheet TPE 340 can be attached to the inner surface of the front and rear support plates 310 and 320 by the joining member. The joining material 300 is often called an elastomer. They are all harder than rubber, less plastic and resilient. Thereby, the pressure of the back soil layer (S) can be absorbed and reduced, and the adhesion with both side surfaces of the laminated wood plate (200) can be increased.

To this end, the thermoplastic elastic sheet 340 comprises 20 to 60% by weight of a polyolefin resin, 30 to 70% by weight of EPM rubber, 0.5 to 2% by weight of carbonylbiscaprolactam, 1 to 5% by weight of tetrahydrofurfuryl methacrylate, 0.5 to 3% by weight of dipropylene glycol diacrylate, 0.5 to 3% by weight of 1,6-hexanediol diacrylate, 0.5 to 3% by weight of N, N'-m-phenylene dimaleimide, 1.5% by weight, and 0.1 to 1.0% by weight of p, p'-oxybisbenzenesulfonyl hydrazide.

The polyolefin-based resin imparts elasticity, improves rigidity and heat resistance, and improves the flowability of the elastomer due to its low viscosity when mixed with EPM rubber. As such polyolefin-based resins, isotactic polypropylene, ethylene-propylene copolymer and the like can be used. The polyolefin resin is preferably contained in an amount of 20 to 60% by weight. If it is less than 20% by weight, the flowability may be deteriorated. If it exceeds 60% by weight, the elasticity and flexibility of the elastomer may be deteriorated, .

The EPM rubber is an ethylene-propylene copolymer rubber, and an ethylene-propylene copolymer rubber can be used. The EPM rubber has elasticity and exhibits elasticity and flexibility. The EPM rubber is preferably contained in an amount of 30 to 70% by weight. If it is less than 30% by weight, elasticity and flexibility of the elastomer may be deteriorated. If it exceeds 70% by weight, flowability may be lowered.

The carbonylbiscaprolactam is added to improve the rigidity of the thermoplastic elastic sheet 340 in order to increase the supporting force. The carbonylbiscaprolactam is preferably contained in an amount of 0.5 to 2% by weight.

Tetrahydrofurfuryl methacrylate is added in an amount of 1 to 5% by weight, and functions as a diluent, thereby enhancing adhesion.

Dipropylene glycol diacrylate and 1,6-hexanediol diacrylate are each included as a crosslinking agent in an amount of 0.5 to 3% by weight, respectively. The molecular sieve may be interconnected to form a polymer, and the crosslinking density may be increased to enhance mechanical properties have.

The N, N'-m-phenylene dimaleimide is contained in an amount of 0.5 to 3% by weight as a crosslinking aid, which is highly reactive so that a rapid crosslinking reaction can take place.

Stannus chloride is contained in an amount of 0.5 to 1.5% by weight, which increases the chemical reaction rate and promotes crosslinking to activate crosslinking.

The p, p'-oxybisbenzenesulfonylhydrazide is contained in an amount of 0.1 to 1.0% by weight and functions as a foaming agent.

6B, it further includes a support wood board 500 disposed on the rear surface of the laminated wood board 200 and connected between the binder vertical lines L so that the reinforcement to the foundation layer S can be strengthened have.

7A and 7B, the soil layer S is formed by filling the soil behind the plurality of laminated wooden boards 200, so that before forming the soil layer S, the laminated wooden boards 200 The ground layer S may be formed thereon after the support D is placed on the rear side of the ground G and the geogrid G is installed.

8A and 8B, the recording block 400 is stacked on the upper side of the transverse frame 150 and disposed on the front side of the laminated wood board 200, and a plurality of It is installed in rows and columns. For this, the recording block 400 includes a main body 410, a recording unit 420, and a greening unit 430.

A recording space 412 in which the recording unit 420 is inserted between the front and both side support arms 411 is formed on both sides of the main body unit 410, A soil-free space 413, which is formed in communication with the recording space 412 and filled with the gravel-like material, A stepped hole 431 having a step 431a formed on both sides of the front and rear sides of the earth and the earth 413 is formed and an enlarged hole 432 which gradually expands toward the front side is formed at the front, 410 to prevent the seeds or the seedlings from deeply rooting on the greenery part 420 so that the plants can not be easily detached.

The main body 410 is formed with an insertion hole 411a inside the both side support arms 411 and an absorbing member 415 for absorbing water is inserted into the insertion hole 411a, The bridge 415a is formed in the lower part of the discharge space 415 and the outflow passage 414 is formed between the insertion hole 411a and the earth and sand space 413 and the bridge 415a is inserted into the outflow passage 414 And the water absorbed by the absorption member 415 is supplied to the soil portion 430 through the bridge 415a to help the vegetation of the plant.

The main body part 410 is provided with a locking protrusion 416 in front of the recording space 412 and one or a plurality of interlocking bars 417 are installed horizontally on the locking protrusion 416, ), And the plant can be supported on the intermittent bar 417 to help the plant grow, and the escape can be prevented.

The main body part 410 is composed of 20 to 30 parts by weight of coarse aggregate, 10 to 20 parts by weight of diatomaceous earth, 10 to 20 parts by weight of loess, 10 to 15 parts by weight of steel making slag, 5 to 10 parts by weight of fly ash, 10 to 10 parts by weight of desulfurization gypsum, 1 to 5 parts by weight of mineral fibers, 1 to 5 parts by weight of pine leaf powder, 1 to 5 parts by weight of sepiolite, and 0.1 to 1 part by weight of colloidal silica. 55% by weight of sodium silicate, 10 to 20% by weight of sodium silicate as a binder and 30 to 40% by weight of water.

The coarse aggregate has a size of 5 to 10 mm in an aggregate of 90% or more remaining in a 5 mm sieve, and 20 to 30 parts by weight of the inorganic composition is used to improve the permeability by the pores formed between the coarse aggregates.

Diatomaceous earth is a sediment formed by accumulation of silicate hazards of diatomic algae, sea or lake, mainly composed of silicic acid, and is white or grayish white. Since it is porous, it is strong in absorbency, and 10 to 20 parts by weight of the inorganic composition is contained, so that the water absorbed by the soil layer (S) during rainfall can easily pass through to prevent collapse of the soil layer (S).

The loess is mainly composed of silt-sized particles and is pale yellow soil loosely cemented by calcium carbonate. It acts as a mixed material which is mixed with coarse aggregate, steel slag and diatomaceous earth to partially fill the void, and has a large porosity , And 10 to 20 parts by weight of the inorganic composition to absorb and discharge moisture to prevent the soil layer (S) from collapsing.

Steelmaking slag is a slag generated in the steelmaking process. It occurs during the process of removing impurities such as carbon, phosphorus and sulfur by refining pig iron in a converter, and contains useful components such as CaO and SiO _{2. In the} present invention, By weight, and 10 to 15 parts by weight of the inorganic composition having a particle size of 1 to 5 mm is used to reinforce the strength.

Fly ash is an industrial by-product of a thermal power plant and is collected from a chimney and has latent hydraulic characteristics, so that it contains 5 to 10 parts by weight of the inorganic composition and contributes to long-term strength development.

The desulfurized gypsum contains a large amount of CaO and contains 5 to 10 parts by weight of the inorganic composition to promote hydration of the fly ash, thereby increasing the long-term strength development.

The mineral fiber contains 1 to 5 parts by weight of the inorganic composition to provide the recording block with a predetermined strength and to prevent cracking.

Sepalite is a micro clay mineral which is microcrystalline, soft and has an acicular crystal structure and is light and pore-clay. It is excellent in bonding force and absorbability, and in the present invention, 1 to 5 parts by weight of the inorganic composition is contained to provide excellent bonding force and absorption power .

The colloidal silica is a silicon by-product of ultrafine particles generated in the production of silicon. In the present invention, 0.1 to 1 part by weight of the inorganic composition is contained to fill the gap between particles of the green block to some extent.

The sodium silicate is contained in an amount of 10 to 20% by weight and acts as a binder so that a firm and firm close bonding is achieved.

Charcoal powder is a powder of charcoal made by solid wood such as oak tree as a raw material and progressing carbonization more than charcoal. During the manufacturing process, the bark of charcoal almost disappears and the surface is white because of ash. The carbon content is 90 to 95%, the ash content is about 2%, and contains a trace amount of water. In the present invention, 1 to 5% by weight is included in the present invention so that the inflow water is easily permeated, and the mineral leaching can contribute to the vegetation of the plant. have.

The pine needle powder has deodorization, antiseptic and antimicrobial action of the inorganic composition. In the present invention, 0.1 to 1% by weight is included to increase the durability of the green block.

9, the recording unit 420 is inserted into the recording space 412, and the coconut fiber 421 and the impregnation 422 are mixed, and the seed or seedling is included, And is formed to be attached to an outer net 423 formed in a net shape to prevent loss of greenery and soil, to ensure air permeability, and to allow rooting of plants. The coconut fiber (421) is a fiber obtained by pulverizing coconut shells. By forming pores, air permeability is ensured, and the roots of plants can be easily expanded. Pregnancy (422) is excellent in moisture retention, so that the moisture around the plant can be maintained for a long time, thereby facilitating root growth of the plant. It is preferable that 50 to 70% by weight of the coconut fiber 421 and 30 to 50% by weight of the conception 422 are mixed in the recording unit 420. If the conception 422 is excessively contained, the roots of the plant may be decomposed due to excessive humidification, and the soil loss prevention function may be reduced if the conception 422 is included in an excessively small amount.

The horseshoe fibers of the outer net (423) are vegetable fibers, which protects the roots of plants in the initial stage and does not interfere with the larger growth of the plants because they decompose and disappear naturally over time.

The sand slope portion 430 is filled with the earth sand in the sand slope portion 413.

The main body part 410 is provided with a coupling groove 411b in the shape of a triangular flask at the upper and lower ends of the sides of the both side support arms 411 and a coupling member 411b having triangular coupling projections 441 on both sides thereof. The plurality of recording blocks 440 are inserted into the coupling groove 411b so as to firmly couple adjacent recording blocks in the horizontal direction.

In addition, a fastening protrusion 418 is formed on the upper part of the main body part 410 and a fastening groove (not shown) corresponding to the shape of the fastening protrusion 418 is formed on the lower part of the main body part 410, The block 400 can be firmly coupled in the vertical direction, and the recording-reinforcing retaining wall thus combined is shown in FIG.

On the other hand, after the recording-reinforced retaining wall is constructed as described above, the floor panels 100 are arranged at regular intervals on the top of the constructed soil layer S, and the laminated wood panel 200 stacked on the top of the recording- A plurality of laminated wooden boards 200 are stacked in a state in which a binder 300 is interposed on the bottom wooden boards 100 so that the laminated wooden boards 200 200 are filled with soil and the soil layer S is formed repeatedly so that a plurality of soil layers S can be sequentially formed.

As a result, the greening reinforcing retaining wall according to the present invention is constructed of a retaining wall by using wood to improve the supporting force and the workability, is economical, and facilitates plant vegetation.

The present invention is not limited to the above-described embodiments. Anything having substantially the same constitution as the technical idea described in the claims of the present invention and achieving the same operational effect is included in the technical scope of the present invention.

100. Floors 110. Flooring
120. Projection piece 130. Support projection
150. Horizontal line 155. Horizontal line
200. Laminated wood plate 210. Fastening groove
220. Insertion ball 230. Insertion rod
300. Binder 310. Front support plate
311. Upper projection 312. Lower groove
320. Rear support plate 321. Upper projection
322. Lower groove 330. Connection bar
340. Thermoplastic elastic sheet 400. Recording block
410. Body 411. Support arm
411a. Insertion hole 411b. Joining groove
412. Recording space 413. Earth space
414. Spillway 415. Absorbing member
415a. Bridge 416. Hanging chin
417. Intermittent bar 418. Fastening protrusion
420. Recording section 421. Coconut fiber
422. Conception 423. External network
430. Tosabu 431. Stepped hole
431a. Step 432. Expansion hole
440. Coupling member 441. Coupling protrusion
500. Support Wood Board D. Support
G. Geogrid L. Vertical line of binder
S. soil layer

Claims (9)

A plurality of floor arcs arranged at regular intervals and having concave grooves formed on the upper and lower sides respectively;
And a fastening groove is formed in each of the upper and lower portions extending in the longitudinal direction. The fastening rod is inserted into the insertion hole formed at the opposite end portions, A plurality of laminated wood plates for connecting adjacent laminated wood plates, sequentially stacking the laminated wood plates in the up and down direction and supporting the soil layer formed by filling the soil at the rear side;
And a plurality of vertically arranged connecting members are vertically stacked on the front and rear supporting plates. The front and rear supporting plates vertically installed are connected to each other at the center, and the connecting bars are inserted into the connecting grooves of the upper and lower laminated wood plates A joining material for supporting the upper and lower laminated wood plates; And
A recording space in which a support arm is protruded on both sides of the front side and a recording part is inserted in front of the side between the support arms is formed in the rear side of the recording space, A main body portion formed in communication with the recording space and formed with a gravel space filled with the gravel, a main body portion inserted into the recording space, wherein the coconut fiber and the conception are mixed, the seed or seedling is included, A recording unit, and a soil block filled with a soil material in the soil material space,
The thermoplastic elastic sheet (TPE) is attached to the inner surface of the front and rear support plates. The thermoplastic elastic sheet (TPE) is composed of 20 to 60 wt% of a polyolefin resin, 30 to 70 wt% of EPM rubber, 0.5 to 3% by weight of 1,6-hexanediol diacrylate, 1 to 5% by weight of N, N < RTI ID = 0.0 > 0.5 to 3% by weight of? -m-phenylene dimaleimide, 0.5 to 1.5% by weight of stannic chloride, and 0.1 to 1.0% by weight of p, p'-oxybisbenzenesulfonylhydrazide. Reinforced retaining wall.
delete The method according to claim 1,
Further comprising a support wood plate disposed on a rear surface of the laminated wooden board and formed between the vertical members of the binder material.
The method according to claim 1,
Wherein the main body comprises 20 to 30 parts by weight of coarse aggregate, 10 to 20 parts by weight of diatomaceous earth, 10 to 20 parts by weight of loess, 10 to 15 parts by weight of steelmaking slag, 5 to 10 parts by weight of fly ash, 5 to 10 parts by weight of desulfurized gypsum, 40 to 55% by weight of an inorganic composition comprising 1 to 5 parts by weight of mineral fibers, 1 to 5 parts by weight of sepiolite and 0.1 to 1 part by weight of colloidal silica, 10 to 20% by weight of sodium silicate as a binder, 30 to 40% %, 1 to 5% by weight of white coal powder, and 0.1 to 1% by weight of pine tree powder.
The method according to claim 1,
Wherein the gravel-like space is formed with a stepped hole having a step on both sides at the rear, and an enlarged hole extending gradually toward the front side is formed in front of the stepped hole.
The method according to claim 1,
Wherein the main body portion is provided with a locking protrusion at the front of the recording space and one or a plurality of locking bars are provided horizontally on the locking protrusion to prevent separation of the recording portion.
The method according to claim 1,
The main body has an insertion hole formed in the inside of the both side support arms, an absorbent member for absorbing water is inserted into the insertion hole, an outflow passage is formed between the insertion hole and the adhered space, Which can be supplied to the tobacco.
The method according to claim 1,
The main body part has flask-shaped coupling grooves formed at the upper and lower ends of the sides of the two side support arms, and a coupling member having coupling projections of triangular shape at both sides thereof is inserted into the coupling groove to couple the adjacent recording blocks It is characterized by a recording reinforcing retaining wall.
The method according to claim 1,
The laminated wooden boards laminated on the top are fastened in an orthogonal direction so as to sandwich the concave grooves of the floor boards, and a plurality of laminated wood boards And a plurality of soil layers are sequentially formed by repeating the process of stacking the binder in the intervening state and filling the soil behind the laminated wood sheet to form the soil layer.

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