JP2018091047A - Artificial ground and method for constructing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct artificial ground with high stability with the effect of suppressing sinking by utilizing repulsion energy and buoyancy of a foamed resin block.SOLUTION: The artificial ground includes a foamed resin block 1, a pile 4, a field-in-place concrete 7, and a reinforcing bar 10. The foamed resin block has an inverted pyramidal recess 2 on the upper surface of the block and a pile insertion hole 3 at the bottom of the inverted pyramidal recess 2 and is laid on the ground 15. The piles are driven into the local ground 15 through the pile insertion holes 3, leaving the upper part in the inverted pyramidal recess 2. The field-in-place concrete 7 has an inverted pyramidal portion 8 which is placed in the inverted pyramidal recess 2 and joined to the upper portion of the pile 4 and has a plate-like portion 9 placed on the foamed resin block 1 and integrated with the inverted pyramidal portion 8. The reinforcing bars 10 are buried in the plate-like portion 9.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an artificial ground that is constructed to suppress ground subsidence due to a load of a structure when a structure such as a civil engineering structure or a building is constructed on soft ground.

Conventionally, the following artificial ground is known.
(1) Artificial ground using cement-based solidified material. Artificial ground in the form of a plate made by mixing cement-based solidified material with local soil to form semi-concrete (Patent Document 1). In Japan, it is widely used. If construction management is carried out based on correct knowledge, it is a stable earth retaining method with high earthquake resistance and drainage, but there are the following problems.
・ There are environmental challenges and use is limited in residential areas. In addition, appropriate selection of solidification material is required depending on the soil quality.
・ If mixing work of soil and cement-based solidification material is not possible for some reason, the local soil will be transported to another location, mixed at another location, then transported to the site, and construction will be carried out. Need to be accounted for.
-If a plate of considerable thickness is not constructed, it is difficult to obtain uniform settlement, and uneven settlement often occurs.
-Depending on the thickness of the plate to be constructed, it will be impossible to drain the groundwater on the back side of the plate, so it is necessary to provide a drainage layer. The drainage layer requires measures that are supposed to be clogged due to the long-term drainage action, which increases costs.
・ Drainage pipes and sewer pipes cannot be installed on semi-concrete plates in the future.

(2) Artificial ground using a concrete block A top (concrete) type concrete block consisting of a disc part, a conical part, and a shaft leg part is inserted into the site to make it stand alone, and a top type concrete block. Artificial slabs that are connected to each other by reinforcing bars, filled with crushed stone (using 40-0 mm) from the space between the discs and the openings between the discs, and compacted with a filling machine. It is the ground (Patent Document 2). There are advantages such as easy construction on site, but there are the following problems.
・ Since the Koma-type concrete block is heavy, it is difficult to construct manually, and heavy machinery is required for construction. Since working in confined spaces becomes very difficult, an increase in construction costs is inevitable.
・ Since the opening for throwing crushed stone is small and the space extends 45 ° downward, sufficient compaction cannot be performed. As a result, it may drop slightly in the initial stage when the load is applied to the finished plate.
・ If the groundwater rises or the groundwater increases due to heavy rain, the fine particles in the filled crushed stone fluidize and the friction between the Koma-type concrete block and the stuffed crushed stone layer is lost. There is a possibility that cavities may be formed, and that unequal subsidence may occur due to subsidence or shrinkage of the padding material due to shaking during an earthquake, etc., and it may not function as a plate.

(3) Population ground filled with crushed stone in resin and made into a plate shape by friction between resin and crushed stone A turtle shell-shaped resin body with a thickness of about 150 mm is packed into crushed stone and made into a plate by friction between the resin body and crushed stone. It is a construction method to laminate the ground. Also in this construction method, strength is reduced by fluidization of fine particles in crushed stone at high groundwater, and the sense of unity as a plate-like part is lost.

JP 51-139117 A JP 61-122328 A

  In addition, when many artificial ground products are subjected to structural loads after construction, the artificial ground subsidizes to some extent, and the subsidence temporarily settles due to friction with the ground, but due to earthquake shaking, heavy rain, and long rain Increased soil moisture content may cause fluidization and settlement.

  Therefore, an object of the present invention is to construct an artificial ground having a high settlement suppression effect and high stability.

  In addition, the present invention has a structure in which a large-sized water lily (Daemon lotus) has a structure having many air layers. The idea was to make foamed resin with many layers into blocks of a specific shape so that on-site concrete with a specific structure can be cast, and it was completed after intensive studies.

[1] Artificial ground A foamed resin block laid on the local ground, having an inverted-conical recess on the top surface of the block, and a pile insertion hole at the bottom of the inverted-conical recess,
A pile driven into the ground through the pile insertion hole, leaving the upper part in the inverted spindle-shaped recess,
A cast-in-place concrete made up of an inverted cone-shaped portion cast in the inverted spindle-shaped recess and joined to the upper portion of the pile, and a plate-shaped portion cast on the foamed resin block and integrated with the inverted cone-shaped portion;
It is an artificial ground characterized by including a reinforcing steel bar embedded in a plate-shaped part.

Crushed stones piled on cast-in-place concrete,
A second similar foamed resin block laid on the crushed stone;
A second pile that is driven between the crushed stones through the pile insertion hole of the foamed resin block, and the upper part is left in the inverted spindle-shaped recess of the foamed resin block;
A second conical portion that is formed in the inverted conical concave portion and joined to the upper portion of the pile, and a plate-shaped portion that is provided on the foamed resin block and integrated with the reverse conical portion. On-site concrete,
An artificial ground further including a reinforcing steel bar embedded in the plate-like portion may be used.

  A resin mat may be interposed between the foamed resin block and the cast-in-place concrete.

  The resin mat is interposed between the inverted plate-shaped concave portion and the inverted cone-shaped portion, and between the upper surface of the foamed resin block and the plate-shaped portion extending laterally from the upper end of the weight-shaped plate. A mode provided with the horizontal plate which can be illustrated can be illustrated.

  The resin mat may further include a vertical plate standing from the periphery of the horizontal plate, and the vertical plate may be provided with a notch into which the reinforcing reinforcing bar is inserted.

[2] A method for constructing artificial ground A step of laying a foamed resin block having an inverted-conical recess on the block upper surface and a pile insertion hole on the bottom of the inverted-conical recess on the local ground;
Driving the pile into the local ground through the pile insertion hole, leaving the upper part of the pile in the inverted conical recess,
Disposing reinforcing reinforcing bars above the foamed resin block;
An inverted cone-shaped portion cast in the inverted-conical recess and joined to the top of the pile, and a plate-shaped portion that is cast so as to embed a reinforcing reinforcing bar on the foamed resin block and integrated with the inverted cone-shaped portion; And a step of forming a cast-in-place concrete comprising: an artificial ground construction method.

Loading crushed stone on cast-in-place concrete;
Laying a second similar foamed resin block on the crushed stone;
Driving the second pile between the crushed stones through the pile insertion hole of the foamed resin block, and leaving the upper part of the pile in the inverted spindle-shaped recess of the foamed resin block;
Disposing a second reinforcing bar above the foamed resin block;
A second conical portion that is formed in the inverted conical concave portion and joined to the upper portion of the pile, and a plate-shaped portion that is provided on the foamed resin block and integrated with the reverse conical portion. The step of forming the cast-in-place concrete may also be a method for constructing artificial ground.

  A resin mat may be placed on and adhered to the foamed resin block, and the resin mat may be interposed between the foamed resin block and the cast-in-place concrete.

[3] Foamed resin block for artificial ground This is a foamed resin block for artificial ground having an inverted-conical recess on the upper surface of the block and a pile insertion hole on the bottom of the inverted-conical recess.

  According to the present invention, the load of the structure constructed above can be appropriately dispersed in the soil, and the energy of repulsion due to the shrinkage of the foamed resin block can be made a reaction force against the load, and foaming is performed when the water level is high. The buoyancy generated in the resin block can also be a reaction force against the load, so that it is possible to construct an artificial ground having a high settlement suppressing effect and high stability.

(A) of the foamed resin block of the specific example 1 which concerns on Example 1 is a perspective view, (b) is a top view, (c) is sectional drawing, (d) is a perspective view of a pile. Similarly, (a) of the foamed resin block according to Example 2 is a plan view, and (b) is a cross-sectional view. Similarly, (a) of the foamed resin block according to Example 3 is a perspective view, and (b) is a cross-sectional view. (A) in the middle of constructing an artificial ground by laying the foamed resin block of Example 1 on the local ground is a plan view, and (b) is a cross-sectional view. It is sectional drawing of the artificial ground constructed by forming on-site cast concrete. It is sectional drawing of the artificial ground constructed by providing the foamed resin block and the cast-in-place concrete in two layers. It is sectional drawing in the middle of constructing the artificial ground by laying the foamed resin block of the specific example 2 on a local ground. It is sectional drawing of the artificial ground constructed by forming on-site cast concrete. It is sectional drawing of the artificial ground constructed by providing the foamed resin block and the cast-in-place concrete in two layers. (A) of the foamed resin block which used the interposition mat | matte which concerns on Example 2 together is an exploded perspective view, (b) is sectional drawing. It is sectional drawing which shows a part of artificial ground constructed by laying the interposition mat and the foamed resin block on the local ground and forming on-site cast concrete.

(1) Foamed resin block The resin of the foamed resin block is not particularly limited, and examples thereof include polystyrene (styrene), polyurethane, and polyolefin. In particular, a foamed resin block which is an aggregate of foamed resin particles containing closed cells is preferable because water does not enter the bubbles even in a water-immersed state for a long period of time.
Although the physical property of a foamed resin block is not specifically limited, The following characteristic (all are based on JISA9511) can be illustrated.
Density 12-35 kg / m ³ (preferably 16-30 kg / m ³ , more preferably 20-30 kg / m ³ )
Allowable compressive stress of 20 to 200 kN / m ² or more (preferably 35 to 140 kN / m ² , more preferably 50 to 100 kN / m ² )

Although the shape of a foamed resin block is not specifically limited, A rectangular parallelepiped, a cylinder, a polygonal column (hexagonal column etc.), etc. can be illustrated. A rectangular parallelepiped in plan view is preferable in that it can be laid on the local ground so that there is substantially no gap between the foamed resin blocks.
Although the dimension of a foamed resin block is not specifically limited, When a planar view dimension is a plane square, 500-2500 mm of sides are preferable, and thickness (height) has preferable 200-1200 mm. When it is smaller than these ranges, the buoyancy is weakened, and when it is larger than these ranges, the handleability is lowered.

The inverted pyramid shape of the inverted pyramid recess is not particularly limited, and examples thereof include an inverted cone shape, an inverted polygonal pyramid shape (an inverted quadrangular pyramid shape, etc.).
The inclination angle of the inverted pyramid with respect to the horizontal is not particularly limited, but is preferably 30 to 60 degrees, and more preferably 40 to 50 degrees. Further, the inverted pyramid-shaped cross-section line is not limited to a straight line, and may include an inwardly convex curve or an inwardly concave curve.
The size of the inverted conical recess is not particularly limited, but when the size in plan view is circular, the diameter is preferably 400 to 2400 mm, and the depth (height) is preferably 150 to 1150 mm. If it is smaller than these ranges, the inverted cone-shaped portion of the cast-in-place concrete placed in the inverted conical recess will be small, and the load borne by the inverted cone will be small. If it is larger than these ranges, it will concentrate on the pile. The load increases.

  The shape of the pile insertion hole is not particularly limited, but is preferably matched with the shape of the pile, and a circular hole is preferable for a columnar pile.

(2) Pile Although the material of a pile is not specifically limited, Resin, concrete, steel, etc. can be illustrated and resin is preferable at a lightweight point.
Although the thickness of a pile is not specifically limited, 50-200 mm is preferable. If it is smaller than this range, the frictional resistance against the soil will be small, and if it is larger than this range, the handleability will be reduced.
The driving length of the pile into the local ground is not particularly limited, but is preferably 200 to 1500 mm. If it is smaller than this range, the resistance will be small, and if it is larger than this range, the handleability will be reduced.
The driving length of the piles between the crushed stones is not particularly limited, but is preferably 100 to 300 mm. If it is smaller than this range, the restraining force becomes smaller, and if it is larger than this range, the handleability decreases.
The length of the upper part of the pile left in the inverted pyramid recess is not particularly limited, but is preferably 50 to 1000 mm (but does not exceed the depth of the inverted pyramid recess). If it is smaller than this range, the joining force between the upper portion of the pile and the inverted conical portion is reduced.

(3) Resin mat The resin of the resin mat is not particularly limited, but a resin having good adhesion to the foamed resin block is preferable.

(4) Structures Structures constructed on the artificial ground are not particularly limited, but civil engineering structures (for example, box culverts, waterways, retaining walls) and buildings (for example, houses, factories, warehouses, etc.) Etc. can be illustrated.

The shape and size of each part of the examples given below are examples and can be changed as appropriate.
1 to 3 show three types of foamed resin blocks 1 according to Example 1 (specific examples 1 to 3 having different dimensions or partial shapes). Each of the foamed resin blocks 1 has a rectangular parallelepiped shape in plan view, and has an inverted spindle-shaped recess 2 on the upper surface of the block and a pile insertion hole 3 penetrating through the bottom of the inverted spindle-shaped recess 2. As the foamed resin, for example, a trade name “Achilles styrene block” which is a bead-method polystyrene foam product of Achilles Corporation can be used.
In the foamed resin block 1 in FIG. 1 (specific example 1), the height of the rectangular parallelepiped is 300 mm, and one side of the square in plan view is 700 mm. The inverted conical recess 2 has an inverted conical shape with an inner diameter of 100 mm at the lower end and an inner diameter of 600 mm at the upper end, and the cross-sectional line is a straight line with an inclination angle of 45 degrees. The pile insertion hole 3 is a round hole having an inner diameter of 100 mm and a vertical length of 50 mm.
In the foamed resin block 1 in FIG. 2 (specific example 2), the height of the rectangular parallelepiped is 400 mm, and one side of the square in plan view is 1000 mm. The inverted conical recess 2 has an inverted conical shape with an inner diameter of 100 mm at the lower end and an inner diameter of 800 mm at the upper end, and the cross-sectional line is a straight line with an inclination angle of 45 degrees. The pile insertion hole 3 is the same as the specific example 1.
In the foamed resin block 1 in FIG. 3 (specific example 3), the height of the rectangular parallelepiped is 400 mm, and one side of the square in plan view is 1000 mm. The inverted conical recess 2 has an inverted conical shape with an inner diameter of 100 mm at the lower end and an inner diameter of 1000 mm at the upper end, and the cross-sectional line is a curved line that is convex inward at the upper part and a straight line with an inclination angle of 45 degrees at the lower part. The pile insertion hole 3 is the same as the specific example 1.

  A pile 4 is shown in FIG. The pile 4 is a resin-made columnar pile having a diameter of 95 mm, and has a flange portion 5 having a diameter of 120 mm at the upper end and a tapered portion 6 at the lower end. The pile 4 has various lengths, for example, 350 mm, 400 mm, 700 mm, and 800 mm.

Next, the construction example shown in FIGS. 4 and 5 is an artificial ground constructed on a local ground 15 that is relatively light using the foamed resin block 1 of FIG. 1 (specific example 1). is there. This artificial ground is assumed to build a box culvert 17 on the concrete ground 16 via the leveled concrete 16, and is composed of the following elements.
A plurality of foamed resin blocks 1 are laid side by side on the local ground 15 that is relatively light in softness so as to be arranged vertically and horizontally in close proximity to each other in plan view.
The pile 4 is driven into the local ground 15 through the pile insertion hole 3 of the foamed resin block 1, and the upper portion (for example, the length of 50 to 150 mm) of the pile 4 is left in the inverted conical recess 2. A pile 4 having a length of 700 mm is driven into the foamed resin block 1 at the end, and a pile 4 having a length of 400 mm is driven into the foamed resin block 1.
An inverted conical portion 8 that is cast in the inverted conical recess 2 and joined to the upper portion of the pile 4, and a 100 mm thick plate that is cast on the foamed resin block 1 and integrated with the inverted conical portion 8. A cast-in-place concrete 7 composed of the shape portion 9 is formed. Since the inverted conical portion 8 entrains the flange portion 5 of the pile 4, it is strongly coupled to the pile 4.
In the plate-like portion 9, vertical reinforcing bars 11 and horizontal bars 12 are connected in a lattice shape in a plan view, and reinforcing reinforcing bars 10 are embedded in a plurality of foamed resin blocks 1.

This artificial ground is constructed by a method comprising the following steps.
(1) As shown in FIG. 4, a plurality of foamed resin blocks 1 are laid on the local ground 15.
(2) The pile 4 is driven into the local ground 15 through the pile insertion hole 3, and the upper portion of the pile 4 is left inside the inverted conical recess 2.
(3) As shown in FIG. 5, the reinforcing steel bars 10 are disposed above the foamed resin block 1.
(4) Concrete is cast on the inverted conical recess 2 and the foamed resin block 1, and the inverted conical portion 8 joined to the upper portion of the pile 4 and the reinforcing steel bar 10 are embedded and integrated with the inverted conical portion 8. The cast-in-place concrete 7 composed of the plate-like portion 9 is formed.

Subsequently, the construction example shown in FIG. 6 is an artificial ground having a two-layer structure constructed on a local ground 15 having relatively heavy softness. This artificial ground includes the following elements on the artificial ground shown in FIG.
On the cast-in-place concrete 7, crushed stones 13 are stacked in a layer shape having a height of 150 to 200 mm, for example. As the crushed stone 13, when the water level of the local ground 15 is low or not, an inexpensive 40-0 mm crushed stone may be used. When the water level of the local ground 15 is high, fluidization of fine particles in the crushed stone is possible. It is preferable to use a single-grain crushed stone that has no problem.
A second similar foamed resin block 1 is similarly laid on the crushed stone 13.
A second similar pile 4 (with a length of 250 to 400 mm) is driven between the crushed stones 13 through the pile insertion holes 3 of the foamed resin block 1 (the driven length is approximately the height of the crushed stone 13). The upper part (for example, the length of 50 to 150 mm) is similarly left in the inverted conical recess 2.
An inverted conical portion 8 that is placed in the inverted conical recess 2 of the foamed resin block 1 and joined to the upper portion of the pile 4, and an inverted cone portion 8 that is placed on the foamed resin block 1 and integrated with the inverted conical portion 8. A second cast-in-place concrete 7 made of the plate-shaped portion 9 is formed.
A second similar reinforcing steel bar 10 is embedded in the plate-like portion 9.

This two-layer artificial ground is constructed by a method including the following steps in addition to steps (1) to (4) in the example of FIG.
(5) The crushed stone 13 is piled on the cast-in-place concrete 7.
(6) The second similar foamed resin block 1 is laid on the crushed stone 13.
(7) The second pile 4 is driven between the crushed stones 13 through the pile insertion holes 3 of the foamed resin block 1, and the upper portion of the pile 4 is left inside the inverted spindle-shaped recess 2.
(8) The reinforcing steel bars 10 are disposed above the foamed resin block 1.
(9) Concrete is cast on the inverted conical recess 2 and the foamed resin block 1, and the inverted conical portion 8 joined to the upper portion of the pile 4 and the reinforcing steel bar 10 are embedded and integrated with the inverted conical portion 8. The second cast-in-place concrete 7 composed of the formed plate-like portion 9 is formed.

  Next, the construction example shown in FIGS. 7 and 8 is an artificial ground constructed on the local ground 15 that is relatively light using the foamed resin block 1 of FIG. 2 (specific example 2). is there. This artificial ground is assumed to build a detached house 19 and its foundation 18 on it, and is composed of the same elements as in the construction example of FIG. Avoid).

  Subsequently, the construction example shown in FIG. 9 is an artificial ground having a two-layer structure constructed on a local ground 15 having relatively heavy softness. This artificial ground further includes the following elements on the artificial ground shown in FIG. 8, is composed of the same elements as the construction example shown in FIG. 6, and is constructed by the same method (a duplicate description is avoided). However, a pile 4 having a length of 800 mm is used for all lower layers.

According to the artificial ground of the present embodiment configured as described above, the following operational effects can be obtained.
(A) A structure in which the load of the structure (16, 18, 19) is applied to the inverted conical portion 8 of the cast-in-place concrete 7, and the inverted conical portion 8 and the pile 4 driven into the soil are joined. Therefore, most of the load is concentrated on the pile 4. A great resistance force acts on the pile 4 that has digged into the soil, and the resistance force of the pile 4 is transmitted from the inverted conical portion 8 to the entire plate-like portion 9 to enhance the settlement suppression effect and stabilize the artificial ground.
(I) The reason why the pile 4 at the end is made longer than the other normal piles 4 is because it has the effect of increasing the degree of restraint in the ground constituting the artificial ground, increasing the ground strength, and increasing the resistance. is there.
(C) The pile 4 bites into the soil to disperse the load and prevent lateral displacement. The effect of preventing lateral slippage is exerted especially during an earthquake, and is effective in stabilizing artificial ground.
(D) Although the load is dispersed from the lower surface of the inverted conical portion 8 to the foamed resin block 1 as well, especially when the load applied to the pile 4 exceeds the limit, the load dispersed in the foamed resin block 1 increases. The load dispersed in the foamed resin block 1 slightly contracts the foamed resin block 1, and the contraction acts as repulsive energy. The repulsive energy always exists as a reaction force inherent to the load from the top. In places where the water level is high, buoyancy is generated in the foamed resin block 1, and resistance to the load (repulsive force) is generated, thereby enhancing the settlement suppression effect and stability. Therefore, it is suitable for the site where the water level is soft and high.

(E) According to the artificial ground having the two-layer structure shown in FIGS. 6 and 9, the subsidence suppression effect can be further enhanced and the artificial ground can be stabilized. Suitable for.
(F) Compared to the conventional artificial ground using cement-based solidified material, the artificial ground of this example has no environmental problems and does not require mixing work of cement-based solidified material. It does not need to be so thick, the need for drainage layers is reduced, and drainage pipes and sewer pipes are easy to install.
(G) Compared to the conventional artificial ground using the Koma-type concrete block, the artificial ground of this example does not require the transportation and construction of the gravity-type Koma-type concrete block, and the crushed stones below the block There is no need for filling and compacting, so there is no problem of fine particles in the crushed stone.
(H) Compared to Example 2 described below, the intervening sheet is not used, and therefore the labor of bonding the intervening sheet to the foamed resin block 1 is not required, so that it is very inexpensive and can be constructed quickly and easily.

The second embodiment shown in FIGS. 10 and 11 is different from the first embodiment in that a resin mat 20 is interposed between the foamed resin block 1 and the cast-in-place concrete 7, and the other is common to the first embodiment. .
The resin mat 20 includes a weight plate 21 interposed between the inverted conical recess 2 and the inverted conical portion 8, and the upper surface of the foamed resin block 1 and the plate-like portion extending laterally from the upper end of the weight plate 21. 9 and a vertical plate 23 standing from the periphery of the horizontal plate 22, and the vertical plate 23 is provided with a notch 24 into which the reinforcing reinforcing bar 10 is fitted.

  In the present embodiment, the resin mat 20 is placed on the foamed resin block 1 and bonded with an adhesive at or before the steps (1) and (6) of the first embodiment. Further, in steps (3) and (8) of the first embodiment, the reinforcing steel bars 10 are fitted into the notches 24 of the resin mat 20. In steps (4) and (6) of the first embodiment, when concrete is placed on the weight plate 21 and the lateral plate 22 of the resin mat 20, the resin is placed between the foamed resin block 1 and the cast-in-place concrete 7. A mat 20 is interposed.

  According to the present embodiment, the same effects as (a) to (g) of the first embodiment can be obtained. In addition, although the effect of (ku) is somewhat low, the resin mat 20 serves as a receiving material for the cast-in-place concrete 7 and supplements the strength of the foamed resin block 1, so that the foamed resin block having a relatively low strength. 1 can also be used.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of this invention, it can change suitably and can be embodied.

DESCRIPTION OF SYMBOLS 1 Foamed resin block 2 Reverse spindle-shaped recessed part 3 Pile insertion hole 4 Pile 5 Flange part 6 Tip detail 7 In-situ concrete 8 Reverse cone part 9 Plate part 10 Reinforcement reinforcement 11 Vertical reinforcement 12 Horizontal reinforcement 13 Crushed stone 15 Local ground 16 Leveling Concrete 17 Box culvert 18 Foundation 19 Housing 20 Resin mat 21 Conical plate 22 Horizontal plate 23 Vertical plate 24 Notch

Claims (9)

A foamed resin block (1) laid on the local ground (15), having an inverted spindle-shaped recess (2) on the upper surface of the block, and having a pile insertion hole (3) at the bottom of the inverted spindle-shaped recess (2);
A pile (4) driven into the local ground (15) through the pile insertion hole (3) and leaving the upper part in the inverted conical recess (2);
An inverted cone-shaped portion (8) which is cast into the inverted spindle-shaped recess (2) and joined to the upper portion of the pile (4), and an inverted cone-shaped portion (8) which is cast on the foamed resin block (1). A cast-in-place concrete (7) consisting of a plate-shaped part (9) integrated with
An artificial ground comprising reinforcing steel bars (10) embedded in the plate-like part (9). Crushed stone (13) piled on cast-in-place concrete (7);
A second similar foamed resin block (1) laid on the crushed stone (13);
The second pile (4) which is driven between the crushed stones (13) through the pile insertion hole (3) of the foamed resin block (1) and the upper part is left in the inverted spindle-shaped recess (2) of the foamed resin block (1). )When,
An inverted cone-shaped portion (8) that is placed in the inverted spindle-shaped recess (2) and joined to the upper portion of the pile (4), and an inverted cone-shaped portion that is placed on the foamed resin block (1) ( 8) a second cast-in-place concrete (7) comprising a plate-like part (9) integrated with
The artificial ground according to claim 1, further comprising a reinforcing bar (10) embedded in the plate-like part (9).   The artificial ground according to claim 1 or 2, wherein a resin mat (20) is interposed between the foamed resin block (1) and the cast-in-place concrete (7).   The resin mat (20) extends laterally from the weight plate (21) interposed between the inverted conical recess (2) and the inverted conical portion (8), and the upper end of the weight plate (21). The artificial ground according to claim 3, comprising a horizontal plate (22) interposed between the upper surface of the foamed resin block (1) and the plate-like portion (9).   The resin mat (20) further includes a vertical plate (23) standing from a peripheral edge of the horizontal plate (22), and the vertical plate (23) is provided with a notch (24) into which the reinforcing reinforcing bar (10) is fitted. The artificial ground described. Laying a foamed resin block (1) having an inverted-conical recess (2) on the upper surface of the block and a pile insertion hole (3) at the bottom of the inverted-conical recess (2) on the local ground (15); ,
Driving the pile (4) into the local ground (15) through the pile insertion hole (3), leaving the upper part of the pile (4) in the inverted spindle-shaped recess (2);
Disposing reinforcing reinforcing bars (10) above the foamed resin block (1);
Inverted cone-shaped recess (2) and inverted conical section (8) joined to the top of pile (4), and reinforcing reinforcing bar (10) embedded in foamed resin block (1) And a step of forming a cast-in-place concrete (7) comprising a plate-like portion (9) integrated with an inverted conical portion (8). Loading the crushed stone (13) on the cast-in-place concrete (15);
Laying a second similar foamed resin block (1) on the crushed stone (13);
The second pile (4) is driven between the crushed stones (13) through the pile insertion holes (3) of the foamed resin block (1), and the upper part of the pile (4) is shaped like an inverted weight of the foamed resin block (1). Leaving in the recess (2);
Disposing a second reinforcing bar (10) above the foamed resin block (1);
An inverted cone-shaped portion (8) that is placed in the inverted spindle-shaped recess (2) and joined to the upper portion of the pile (4), and an inverted cone-shaped portion that is placed on the foamed resin block (1) ( The method for constructing an artificial ground according to claim 6, further comprising the step of forming a second cast-in-place concrete (7) comprising a plate-like portion (9) integrated with 8).   The resin mat (20) is placed on and adhered to the foamed resin block (1), and the resin mat (20) is interposed between the foamed resin block (1) and the cast-in-place concrete (7). The construction method of the artificial ground described.   A foamed resin block for artificial ground having an inverted-conical recess (2) on the upper surface of the block and a pile insertion hole (3) at the bottom of the inverted-concavity (2).

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