JPH06212648A - Foundation construction - Google Patents

Abstract

PURPOSE:To obtain a high tilting resistant force against a tilting force produced by transverse force, such as earthquake by building a pile-shaped body on a ground which forms the lower part of a continuous footing prior to the construction of the continuous footing. CONSTITUTION:An excavation groove 2 is cut on a ground 1. Then, a shaft 12 is drilled with an auger 11 or the like from an excavation bottom 3 and concrete is placed in the shaft 12, thereby building a pile-shaped body 10. Cobbles 4 are spread on the excavation bottom of the excavation groove 2 around the pile-shaped body 10 and fastened. Then, concrete 5 is cast on the cobbles 4 where a continuous footing 6 is built up to loaded on the concrete 5. It is also acceptable to build up the pile-shaped body 10 prior to excavation work. The pile-shaped body 10 is driven into the ground 1, which makes it possible to obtain a high tilting resistant force and reduce the depth of the excavation groove 2 for that high force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basic construction method. More specifically, the present invention relates to an improvement in root cutting work of a foundation construction method for constructing a foundation of a building having a relatively low load such as a wooden house.

[0002]

2. Description of the Related Art Conventionally, as a basic construction method, for example, FIG.
~ The one described in Fig. 6 is known.

In this conventional basic construction method, root cutting work is first carried out. That is, as shown in FIG. 4 (A), the root-cutting groove 2 is dug in the ground 1 along the way, and then, as shown in FIG.
As shown in (B), the root cutting bottom 3 of the root cutting groove 2 is spread with crushed stones (cracked stones) 4 (sand, gravel, etc. are packed between the crushed stones 4 if necessary) and compacted. Discard concrete 5 on top.

After performing such root cutting work,
The cloth foundation 6 is constructed. That is, as shown in FIG.
Reinforcing bars 7 for strengthening the cloth foundation 6 and a temporary frame 8 for forming only the footing portion 6a of the T-shaped cloth foundation 6 are assembled on the discarded concrete 5, and concrete is poured into the temporary frame 8. Then, the footing portion 6a of the cloth foundation 6 is formed. Then, as shown in FIG. 4 (D), the temporary frame 8 is removed, and a new temporary frame 9 for forming only the foundation flash portion 6b of the cloth foundation 6 on the footing portion 6a of the cloth foundation 6 is formed.
Is assembled and concrete is placed inside the temporary frame 9 to form the foundation flash portion 6b of the cloth foundation 6. As for the construction of the cloth foundation 6, as shown in FIG.
It is also practiced that the cloth foundation 6 formed by integrally molding the a and the foundation flash portion 6b into a block is discarded and placed on the concrete 5.

After the cloth foundation 6 has been constructed, as shown in FIG. 6, the excavated soil in which the root cutting groove 2 is dug is backfilled, and the footing portion 6a of the cloth foundation 6 is buried in the ground 1. Only the upper portion of the foundation beam portion 6b is exposed from the ground 1. This backfilling completes the foundation construction, but for the load A of the building, etc., the load bearing force B of the ground 1 is received by the entire lower surface of the footing portion 6a of the cloth foundation 6, and the lateral force due to an earthquake or the like is applied. With respect to the falling force D generated by C, the upper and lower surfaces of the footing portion 6a of the cloth foundation 6 receive the falling resistance force E composed of friction of the ground 1 and earth pressure, respectively.

In such a conventional foundation construction method, the ground 1 on the upper surface side of the footing portion 6a of the cloth foundation 6 is made thick as a means for increasing the fall resistance force E against the fall force D generated by the lateral force C caused by an earthquake or the like. Therefore, since the depth H of the root cutting groove 2 must be increased, the root cutting groove 2
The amount of excavated soil in the trench will be increased, and the gravel stones 4 will be spread over the deep root cutting bottom 3 while paying attention to the surrounding landslides, the concrete 5 will be discarded, and the temporary frame 8 will be assembled. However, there is a problem that the whole construction becomes troublesome. Further, even if the depth H of the root cutting groove 2 is increased, there is a problem that an effective fall resistance E cannot be obtained depending on the soil quality of the ground 1.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and a simple construction of a foundation on which an effective fall resistance against a fall force generated by a lateral force due to an earthquake or the like is formed. It is an object to provide a basic construction method that can be constructed by.

[0008]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the foundation construction method according to the present invention is a root cutting work in which root cutting bottoms dug in the ground are laid with crushed stones and waste concrete is placed. Then, in the foundation construction method of constructing a cloth foundation on abandoned concrete, a shaft is drilled in the ground below the cloth foundation and concrete is placed inside the shaft to construct a pile Is adopted.

[0009]

[Operation] According to the above-mentioned means, since a foundation structure is formed in which the pile-like body digs into the ground from below the cloth foundation, a considerably high fall due to friction between the pile-like body and the ground. It is necessary to increase the depth of the root-cutting groove because a resistance force will be formed and the pile-like body will be constructed by drilling a vertical shaft and placing concrete in the ground below the cloth foundation. There is no need for special work because of the lack of flexibility. Therefore, the problem to be solved is to provide a foundation method capable of constructing a foundation in which an effective fall resistance against a fall force generated by a lateral force due to an earthquake or the like is formed by a simple construction.

[0010]

Embodiments of the basic construction method according to the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the basic construction method according to the present invention.

In this embodiment, a root cutting groove 2 for root cutting work
The construction method of forming the pile-shaped body 10 at the time of the trench is shown.

In this embodiment, first, similarly to the above-mentioned conventional example, the root cutting groove 2 is dug in the ground 1 (see FIG. 2A).
Next, as shown in FIG. 2B, the shaft 12 is drilled from the root cutting bottom 3 with an auger 11 or the like. This vertical shaft 12 is drilled or clothed at regular intervals in the digging groove direction of the root cutting groove 2 in accordance with the load of the building to be built, the distribution of the overturning force D generated by the lateral force C due to an earthquake, etc. Holes are drilled in the corner portions of the base 6. Then, concrete is immediately poured into the drilled vertical shaft 12, and as shown in FIG. 2C, the pile-shaped body 10 is formed on the ground 1 below the cloth foundation 6.

After forming the pile-shaped body 10 in this manner,
As shown in FIG. 2 (D), crushed stones 4 are spread on the root-cutting bottoms 3 of the root-cutting grooves 2 around the pile-shaped body 10 and compacted. Thus, the cloth foundation 6 is formed or placed on the discarded concrete 5.

According to such an embodiment, the vertical shaft 12 is drilled at the same time as the root cutting groove 2 of the root cutting work, and concrete is immediately placed into the vertical shaft 12 to form the pile-shaped body 1.
Since 0 is created, the construction itself of the pile-shaped body 10 is simple and does not hinder the progress of root cutting work.

Further, in the foundation structure constructed according to such an embodiment, as shown in FIG. 1, a part of the lower surface of the footing portion 6a of the cloth foundation 6 is extended downward in a pillar shape, and It looks like the pile-shaped body 10 bites into the ground 1 from below. Therefore, the peripheral surface of the pile body 10 and the ground 1 come into contact with each other over a wide area, and the peripheral surface of the pile body 10 and the ground 1 against the overturning force D generated by the lateral force C due to an earthquake or the like. Due to the friction, a considerably high fall resistance force E is formed. Therefore, it is not necessary to deeply bury the footing portion 6a of the cloth foundation 6 in the ground 1 in order to increase the fall resistance E as in the above-described conventional example, and the upper surface of the footing portion 6a of the cloth foundation 6 is located in the ground 1 The depth H of the root cutting groove 2 can be made shallow to the extent of being exposed.

As a result, the amount of soil excavated in the root-cutting groove 2 is reduced, and the gravel stones 4 are spread and the concrete 5 is discarded without paying attention to the surrounding landslide with respect to the shallow root-cutting bottom 3.
Since it is possible to perform the driving, the assembling of the temporary frame 8 and the like, the whole construction is not troublesome.

Incidentally, making the depth H of the root cutting groove 2 shallow means that the height of the foundation flash portion 6b of the cloth foundation 6 can be shortened, and the cloth foundation 6 can be miniaturized. It is possible to reduce the construction cost of 6.

If the center line L of the pile-shaped body 10 and the center line L'of the foundation flash portion 6b of the cloth foundation 6 are made to coincide with each other, the load resistance becomes good.

FIG. 3 shows a second embodiment of the basic construction method according to the present invention.

In this embodiment, a method of constructing the pile-shaped body 10 before the root cutting work is shown.

In this embodiment, as shown in FIG.
Before digging the root cutting groove 2, the vertical shaft 12 is drilled with an auger 11 or the like, and as shown in FIG. 3 (B), concrete is immediately poured into the vertical shaft 12 to form the pile-shaped body 10. . Then, as shown in FIG. 3C, the root-cutting groove 2 is formed after the formation of the pile-shaped body 10.

According to such an embodiment, in addition to the same operation and effect as those of the first embodiment, the root cutting groove 2 is dug using the vertical shaft 12 and the pile-shaped body 10 as a guide. There are advantages that can be achieved.

As described above, in addition to the embodiment shown in the drawings, before the construction of the cloth foundation 6 after the completion of the root cutting work, the pile-shaped body 10 is formed by destroying a part of the discarded concrete 5 and the cobblestone 4. It is also possible to create.

[0025]

As described above, the basic construction method according to the present invention is
Due to friction over a wide area of the piles and ground, high fall resistance is formed, there is no need to deepen the depth of the root cutting groove, and no particularly troublesome construction is required. There is an effect that a foundation on which an effective fall resistance against a fall force generated by a lateral force due to the above is formed can be constructed by a simple construction.

Further, since the depth of the root cutting groove can be made shallow, there is an effect that the cloth foundation can be downsized and the construction cost of the cloth foundation can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a basic construction method according to the present invention, in a construction completed state.

FIG. 2 is a cross-sectional view of each process showing the construction process of FIG.

FIG. 3 shows a second embodiment of the basic construction method according to the present invention, and is a cross-sectional view of the construction process.

FIG. 4 is a sectional view of a construction process showing a conventional example.

FIG. 5 is a cross-sectional view of a construction process showing another conventional example.

FIG. 6 is a sectional view of the conventional example of FIGS. 4 and 5 in a completed construction state.

[Explanation of symbols]

 1 Ground 2 Root Cutting Groove 3 Root Cutting Bottom 4 Kuriishi 5 Discarded Concrete 6 Cloth Foundation 10 Piles 12 Shafts

Claims (1)

[Claims] 1. A foundation construction method for constructing a cloth foundation on abandoned concrete after performing a root cutting construction in which crushed stones are laid on the root cutting bottom dug in the ground and waste concrete is placed. Before construction, a foundation method is characterized in that a vertical shaft is drilled in the ground below the fabric foundation and concrete is placed inside the vertical shaft to form a pile.