JP2971438B2 - Foamed plastic unit for foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base foamed plastic unit for relatively small structures.

[0002]

2. Description of the Related Art Hitherto, a splittering business, a cobblestone business, and a crushed stone business have been carried out on a ground contact portion of a structure such as a construction work and a civil engineering work. One example is schematically shown in FIG. In FIG. 4, reference numeral 1 denotes a split stone, and reference numeral 2 denotes a ground.

[0003] Such ground work is performed for the purpose of increasing the ground reaction force from the ground to the upper structure, and is expected to have the effect of compacting the soil and the effect of irregularly reflecting the load.

[0004] In recent years, however, there has been a shortage of splitter stones used for splittering, and a shortage and aging of construction workers who are skilled in splittering are increasing.

[0005] In addition, many newly-built subdivisions have land reclamation sites such as swamps, valleys, and shores. Such land has weak ground, and there is much concern about the reaction force of the ground contact portion in order to install civil engineering structures.

[0006]

There is also a method in which a top-shaped concrete block is used instead of split stone.

However, this top-shaped concrete block is
Suitable for large structures, heavy weight, poor workability, and high cost. Therefore, it is not suitable for small structures such as houses.

There is also a method of solidifying the topsoil portion with soil cement or the like.

[0009] However, this method requires a specialized company and is expensive. In addition, since the weight of the ground surface increases, there is also a disadvantage that when the ground is soft, adverse effects such as ground subsidence are likely to occur.

[0010] In view of such problems of the prior art, an object of the present invention is to provide a lightweight foamed plastic unit for foundations which is suitable for relatively small structures, is excellent in workability, and is lightweight.

[0011]

Means for Solving the Problems One of the solutions of the present invention is to form a unit main body from foamed plastic, provide a concave portion or a convex portion on the bottom thereof, provide a connecting portion outside the unit main body, and remove the unit. Provide a through hole in the unit body to pass the prevention pile, connect adjacent units by connecting parts,
This is a foamed plastic unit for a foundation, wherein a pile is driven into a ground through a through-hole, a connection portion is formed in a hook shape, and connection portions of adjacent units are overlapped and connected.

Another solution of the present invention is to form a unit main body from foamed plastic, provide a concave portion or a convex portion at the bottom thereof, provide a connection portion outside the unit main body, and pass a stake for preventing slipping out. A through hole is provided in the unit body, adjacent units are connected by connecting parts, a pile is driven into the ground through the through hole, and construction is performed. Further, the cross-sectional shape of the unit body is generally rectangular or hexagonal It is a foamed plastic unit for a foundation characterized by the following.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A foamed plastic unit for a foundation according to the present invention has a unit body formed of foamed plastic. A concave portion or a convex portion is formed at the bottom of the unit main body, and a connection portion is provided outside the unit main body. In addition, a through hole is formed in the unit main body to allow a pile for preventing the unit from coming off. The foamed plastic unit of the present invention has a configuration in which adjacent units are connected by a connection portion, and a pile is driven into the ground through a through hole to be constructed.

The bottom of the unit body can be formed in a wave shape.

[0015] A trapezoidal projection may be provided at the bottom of the unit body.

A trapezoidal recess may be formed at the bottom of the unit body.

Preferably, the connecting portions are formed in a hook shape, and the connecting portions of adjacent units are overlapped and connected.

It is preferable that the cross-sectional shape of the unit body is entirely rectangular or hexagonal so that the unit body is laid on the ground without gaps.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a state in which two foamed plastic units of the present invention are connected.

The unit body 15 of the base foamed plastic unit 10 is made of foamed plastic such as foamed styrene foam.

The unit main body 15 shown in FIG. 1 has a rectangular plate shape as a whole, and the bottom is formed in a corrugated shape 11.

On four side surfaces of the unit body 15, connecting portions 12a and 12b for connecting the units are arranged. The connecting portions 12a and 12b are hook-shaped, with two hooks 12a facing upward and the other two hooks 12b facing downward. The connection portions 12a and 12b can be formed of, for example, plastic.

When the connecting portions 12a and 12b are aligned in the vertical direction and overlapped, the two units can be easily connected. Conversely, simply lifting one of the units upward can easily remove the unit.

A large number of units 10 are connected by connecting portions 12 and are arranged on the ground without any gaps in the lateral direction.

A through hole 14 for inserting the pile 13 is formed in the center of the unit body 15 in the vertical direction.
The pile 13 is for preventing pulling out, and a large disk is fixed to the top.

A method for constructing the unit of the present invention will be described.

First, the ground to be laid with a corrugated plow is prepared in a corrugated shape.

At this time, if the root bottom is unstable, simple surface improvement is performed using sand, crushed stone, crushed mortar, crushed stone mixed with cement, etc.
0 is constructed.

The unit body 15 is set in accordance with the corrugation of the ground, and the adjacent units 10 are connected to the connecting portions 12a and 12b.
Then, a pile 13 for pulling-out prevention is driven in from above.

Finally, the surface is finished flat by using a rammer from above and pressure is applied to the unit 10 to increase the contact pressure with the ground. Thereby, prestress is generated in the unit, and a higher ground reaction force can be applied.

Since the lower part of the unit main body 15 is corrugated, the direction in which the load is transmitted can be changed, and the soil immediately below can be compacted and compacted.

Since the unit body 15 is made of foamed plastic, buoyancy can be obtained even if the ground liquefies, and an effect of stably maintaining the upper structure can be expected.

Further, since the unit is light, the workability is good and the transportation is easy.

Further, since the construction method is simple, no special engineer is required.

The allowable compression stress of the expanded styrene foam is about 30 t / m ² . On the other hand, the allowable compressive stress required for a timber two-story building is about 5 t / m ² ,
It is about 5, 6, 8 t / m ² for a four-story building, and 6.5, 10 t / m for a reinforced concrete two or three-story building.
m ² .

[0037] Expanded styrene foam therefore has an acceptable degree of compressive stress sufficient as the basis for relatively small buildings.

FIG. 2 is a side view showing another embodiment of the base foamed plastic unit of the present invention.

In the embodiment shown in FIG. 2, a trapezoidal projection 11a is formed at the bottom of the unit body 15. Other configurations are the same as those of the unit in FIG.

FIG. 3 is a side view showing still another embodiment of the foamed plastic unit for a foundation according to the present invention.

In the embodiment shown in FIG. 3, a trapezoidal recess 11b is formed at the bottom of the unit body 15.

[0042]

According to the foamed plastic unit for foundation of the present invention, by laying it under the structural foundation, the load of the upper structural body can be dispersed and transmitted to the ground.
For this reason, it can be used instead of the conventional split stones and cobblestones.

Further, since the concave portion and the convex portion are formed at the bottom, the ground can be tightened and the ground reaction force can be increased.

Furthermore, since the unit body is formed of foamed plastic, even if the ground liquefies due to an earthquake or the like,
Due to the action of the buoyancy, the upper structure can be kept to some extent stable.

Further, since the unit of the present invention is an industrial product, uniform quality can be expected without unevenness in load-bearing characteristics and the like.

The present invention is not limited to the above embodiment. For example, the hook-shaped connecting member is not limited to the one shown in the figure, but may be of various shapes. Further, the rectangle or hexagon of the unit body may be a shape other than the illustrated example.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which two basic foamed plastic units of the present invention are connected.

FIG. 2 is a side view showing another embodiment of the base foamed plastic unit of the present invention.

FIG. 3 is a side view showing another embodiment of the base foamed plastic unit of the present invention.

FIG. 4 is a cross-sectional view schematically illustrating a construction state of a conventional split stone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Unit 11 Corrugation 11a Convex part 11b V-shaped section 12a, 12b Connection part 13 Pile 14 Through hole 15 Unit main body

Claims (5)

(57) [Claims] 1. A unit body (15) is formed of foamed plastic, and a concave portion or a convex portion (11, 11a, 1) is formed at the bottom thereof.
1b), connecting portions (12a, 12b) are provided outside the unit main body (15), and a through hole (14) for passing a stake (13) for preventing the coming off is provided in the unit main body (15). The adjacent units are connected by the portions (12a, 12b), and the pile (13) is driven into the ground through the through holes (14) to be constructed.
a, 12b) are formed in a hook shape, and the adjacent unit (1
5) A foamed plastic unit for a foundation, wherein the connection portions (12a, 12b) of 5) are overlapped and connected. 2. A unit main body (15) is formed of foamed plastic, and a concave portion or a convex portion (11, 11a, 1
1b), connecting portions (12a, 12b) are provided outside the unit main body (15), and a through hole (14) for passing a stake (13) for preventing the coming off is provided in the unit main body (15). The adjacent units are connected by the portions (12a, 12b), the pile (13) is driven into the ground through the through holes (14), and the unit body (15) has a rectangular cross-sectional shape as a whole. A foamed plastic unit for a foundation characterized by being hexagonal. 3. The bottom of the unit body (15) is corrugated (1).
The foamed plastic unit for a foundation according to claim 1, wherein the unit is formed in 1). 4. A trapezoidal projection (11a) is provided at the bottom of the unit body (15).
A foamed plastic unit for a foundation according to item 1. 5. A foamed plastic unit for a foundation according to claim 1, wherein a trapezoidal recess (11b) is formed in the bottom of the unit body (15).