JP2002021094A - Foundation structure for wooden house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure for a building, allowing the section under the floor of the building to be kept in a dry state so as to prevent the corrosion of a ground sill part due to the moisture under the floor and the damage caused by a termite by preventing the moisture from underground from invading the section under the floor, permitting the operations for inspection, repair, and improvement the section under the floor to be easily performed, and enabling the manday of the repair and the improvement to be drastically reduced. SOLUTION: This foundation structure is composed of a crushed stone layer laid at a prescribed depth within the recessed place, wherein a ground surface is dug down at a prescribed depth, approximately all over the building range of the building, a damp-proof membrane laid on the top surface of the crushed stone layer, whose periphery reaches the outside of the constructional range of the building, and a base foundation part made of concrete, which is constructed in a prescribed thickness on the damp-proof membrane, and a rising foundation formed integrally on the base foundation part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure of a building such as a wooden house, and more particularly to a structure for preventing the rise of moisture from under the ground under a floor of a building and preventing corrosion of a foundation or a pillar of the building. It relates to a basic structure that can prevent damage from termites.

[0002]

2. Description of the Related Art Conventionally, in a basic structure of a building such as a wooden house, a structure such as a cloth foundation as shown in FIG. 4 or a solid foundation as shown in FIG. 5 is often used. In the cloth foundation structure shown in FIG. 4, a concrete foundation 10 is formed on the outer periphery of a building and in a portion where main columns are erected. As a procedure for constructing the concrete foundation 10, a groove 11 having a predetermined depth is dug down in the ground of the foundation constructing section, a cobblestone 12 is laid at the bottom of the groove 11, sufficiently tamped, and a reinforcing reinforcing bar 13 is provided. Then, by forming a weir plate and placing concrete in between, it is formed. The above general cloth foundation structure 10
In, most of the ground surface under the floor of the house remains exposed under the floor of the building, but crushed stones 14 are laid on the ground surface under the floor, and a moisture-proof sheet 15 is laid thereon, and a thickness of about several tens mm is further provided. A construction method for constructing concrete 16 is also known. In the solid foundation structure 20 shown in FIG. 5, an embankment 21 is laid over the entire construction area, a moisture-proof sheet 22 is laid on the surface of the embankment 21, and concrete is cast on the moisture-proof sheet so that the upper surface becomes flat. Thus, the foundation 20 is formed, and the base 24 is disposed on the upper surface of the flat foundation 20 via the foundation packing 23.

[0003]

In the conventional general fabric foundation structure, the ground under the floor is exposed, so that the moisture in the ground rises to the underfloor portion of the building and the humidity inside the underfloor increases. Thus, the moisture causes the members such as the base constituting the base of the building to be constantly exposed to the moisture, resulting in a reduction in the life of the building due to corrosion of the base and the pillars. Even with a foundation structure where concrete is constructed by laying a moisture-proof sheet under the floor, since the edge of the sheet is laid only up to the inside of the surrounding foundation, moisture in the ground accumulates on the lower surface of the sheet and the edge of the sheet It advances into the underfloor from the edge and is a factor of increasing the humidity under the floor. In addition, in this cloth foundation structure, the foundation structure of the inner part of the building is continuously formed to obtain a predetermined strength because the strength of the foundation alone is weak, and a plurality of ventilation holes are formed in a rising part of the foundation. However, a large ventilation opening cannot be formed because the strength of the foundation is maintained, so that ventilation under the floor is deteriorated and it is difficult to lower the humidity under the floor.

On the other hand, in conventional wooden houses, damage to buildings by termites has become a problem, and when new buildings are constructed, the application of chemicals for controlling termites is obligatory. However, such chemicals are toxic and are harmful to residents. In addition to raising concerns about some kind of disability, the effects of drugs have expired over the years and damage has occurred several years later.
Damage from termites is particularly concentrated on moist wood, such as the base of water around the house, and it has already been found that termite damage does not occur when the underfloor is kept in a dry environment. .

[0005] In a house constructed with the solid foundation structure 20 described above, since a structure in which a moisture-proof sheet 22 is laid on the entire area under the floor of the building and concrete is cast, moisture from underground into the inside of the floor is formed. Although the rise can be prevented, since the base is constructed via a thin foundation packing 23 on a flat concrete foundation, the space under the floor is narrowed and ventilation under the floor in the water area is sufficiently performed. However, there is a problem that the humidity inside the floor increases.

[0006] Furthermore, in water-related areas such as baths and lavatories in houses, damage is accelerated due to the above-mentioned damage from termites and corrosion due to humidity, and repairs and repairs are often performed before rebuilding. However, in a general cloth foundation method, the height of the foundation under the floor is relatively low and the cloth foundation structure is connected continuously, so inspection and repair work is required. For this reason, there are places where it is difficult or impossible to enter the underfloor part, and it is often difficult to check the damage caused by the termites and the state of corrosion of the base, etc., and to perform repair / repair work. In particular, in the current situation where there is a large number of residential buildings from the makabe method to the large wall method and it is not possible to check the degree of damage to the foundation and columns from above the floor, it is essential that inspection be easily possible from below the floor. Even for houses with solid foundation method, foundations and pillars cannot be inspected because there is no space under the floor, and in general construction, concrete foundations are constructed after plumbing such as water supply and drainage in advance Therefore, a large number of man-hours are required for pipe repair work after the endurance life of pipes, which is said to be about 25 years, has passed.

[0007] In view of the above, the above-mentioned problems in the conventional foundation structure are solved, and moisture from the ground does not enter the underfloor portion of the building, and ventilation is further improved in the underfloor to keep the underfloor dry. SUMMARY OF THE INVENTION It is an object of the present invention to provide a foundation structure of a building capable of preventing the base portion from being corroded by moisture under the floor and from being damaged by termites. It is another object of the present invention to provide a foundation structure of a building capable of easily performing inspection, repair, and repair work on the underfloor portion of a building and greatly reducing the number of repair and repair man-hours.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a crushed stone layer which is laid at a predetermined depth in a recess formed by digging a ground surface at a predetermined depth over almost the entire construction area of a building. A moisture-proof sheet laid on the upper surface of the crushed stone layer to the outside of the construction area of the building, a base foundation portion made of concrete laid on the moisture-proof sheet at a predetermined thickness, and integrated on the base foundation portion And a rising foundation formed on the base. Further, an opening for water plumbing construction penetrating from the surface of the base foundation portion to the surface of the moisture-proof sheet is formed in advance at a required portion of the base foundation portion of the foundation. Further, a rising foundation portion rising from the base foundation portion has an outer peripheral foundation formed continuously along the outer periphery of the building, and a peninsula-type foundation formed by connecting one side to the outer peripheral foundation once. And the island-shaped foundation formed independently of the outer peripheral foundation and the peninsula-type foundation, and each rising foundation is arranged so as not to form a closed area. is there.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings. As shown in FIGS. 1 and 2, in the structure of the foundation 30 according to the present invention, a recess 31 is formed so that the entire ground surface in a range where a building is arranged is cut to a predetermined depth. A crushed stone layer 32 laid so that the upper surface thereof is substantially the same height as the ground surface, a moisture-proof sheet 33 whose outer edge is laid on the upper surface of the crushed stone layer 32 outside the periphery of the building, and a moisture-proof sheet 33
And a concrete foundation 34 formed on the upper surface of the base.

The concrete foundation 34 has a base foundation portion 35 formed with a predetermined thickness of, for example, 150 mm over substantially the entire construction area of the building, and a perimeter corresponding to the outer wall of the building and columns inside the building. And an upright base portion 36 formed corresponding to the portion of the base. Both the base foundation 35 and the rising foundation 36 of the concrete foundation 34 are reinforced by reinforcing steel 37 or the like. It is desirable that the height of the rising base portion 36 is formed to be a sufficient height from the surface of the base base portion 35 so that work such as repair can be easily performed under the floor after the building. It is desirable that the horizontal accuracy of the upper surface of the rising foundation 36 is sufficiently maintained.

As shown in FIG. 3, an opening 38 for pipes for water and sewage is formed in a part of a base foundation 35 of a concrete foundation 34 in a portion where a water area such as a bath or a lavatory is constructed. In addition, by forming in advance the opening 8 for hot water supply observation and introduction of the gas pipe to the lower part of the floor in the rising base portion 36, concrete material for water supply and sewage works and gas works after the foundation is constructed. The number of man-hours for hanging work and the like can be greatly reduced.

Next, a method of constructing the foundation of the above embodiment will be described. A recess 31 having a predetermined depth is formed by excavation on a site surface whose periphery is slightly wider than the area where the building can be built. In this case, a phenomenon such as settlement of the foundation can be prevented at a later date by excavating the ground surface so as not to destroy the stratum. It is desirable that the depth of the recess is about 150 mm.

After sufficiently squeezing the bottom of the recess 31, crushed stones are laid in the recess 31 and further squeezed to form a crushed stone layer 32. The thickness of the crushed stone layer 32 is appropriately set so that the upper surface is substantially the same as the ground surface, that is, about 150 mm, which is the same as the depth of the recess 31. On the upper surface of the crushed stone layer 32, a moisture-proof sheet 33 such as a vinyl sheet is laid so that a peripheral portion is disposed outside the outer wall of the building.
This prevents the rise of moisture from the ground from being guided to the outside of the building and from entering the underfloor portion.

The reinforcing bar 3 is provided on the upper surface of the moisture-proof sheet 33.
7 is placed and concrete is cast to build a flat base foundation 35. The base base portion 35 is formed so that the surface is horizontal over substantially the entire construction area of the building and the concrete thickness is a predetermined thickness of, for example, about 150 mm. Further, on the bottom foundation 35, a rising foundation 36 is formed by concrete casting at a portion where the outer periphery and the inner pillar of the building are arranged. This rising foundation 3
6 also has a reinforcing bar 37 connected to the reinforcing bar 37 of the base base 35. The rising foundation 36 is a peripheral foundation 36a formed along the periphery of the building and a peninsula-type foundation 3 formed by connecting one end to the peripheral foundation 36a.
6b and an island-shaped base portion 36c formed independently of the peripheral edge portion 36a and the peninsula-shaped base portion 36b, and the like.
6c is constructed so that there is no independently closed area in the underfloor after construction so that workers can enter the entire area of the building. By doing so, it is possible to easily perform the work under the floor, the inspection of the base of the base or the pillar after the construction, and the repair work at a later date.

It is preferable to set the height of the upper surface of each portion of the rising foundation 52 as high as possible, that is, the horizontal accuracy, in order to maintain the accuracy of the whole building. An opening 38 that reaches the moisture-proof sheet 33 in advance at the time of placing concrete in the base base portion 35 of the base is provided in a building portion around water such as a bath or a washroom.
Further, an opening 39 for introducing a hot water supply pipe, a gas pipe, or the like into the underfloor may be formed in the rising base portion 36.

A base 40 and a pillar 41 are arranged on the rising foundation 36 of the concrete foundation 34 formed as described above, and a building is constructed. A spacer 42 is interposed between the upper surface of the rising foundation 36 of the concrete foundation 34 and the base 40, and the base 40 is adjusted to be horizontal by combining a plurality of spacers 42 having a predetermined thickness. Rising foundation 3 of base 40 and concrete foundation 34
6, a predetermined gap is formed by the spacer 42,
By the synergistic effect with the ventilation performance by the structure of the peninsula type foundation or the island type foundation, ventilation under the floor becomes good and it is possible to keep the inside of the floor dry.

[0017]

As described above, according to the foundation structure of the present invention, a concrete base base portion 35 reinforced with reinforcing steel is formed over the entire area where the building is to be constructed. The rising foundation 36 to be supported is connected and integrally formed by the reinforcing bar 37, and the whole foundation is formed in a square structure. Therefore, the foundation formed inside is formed into a peninsula-type foundation or an island-type foundation. Even if formed, sufficient strength can be maintained as a basis. Further, since the moisture-proof sheet 33 is laid under the base foundation portion 35 to the outside of the portion under the floor of the building, it is possible to reliably prevent the moisture in the ground from rising under the floor of the building, Since the inner foundation is formed on a peninsula-type foundation or island-type foundation that is not continuous with each other, ventilation can be improved throughout the underfloor area, so that the underfloor of the building can be maintained in a dry state. And the occurrence of termites can be reliably prevented, and damage to the base and the like due to termites can be prevented.

Further, an opening penetrating up to the surface of the moisture-proof sheet 33 is provided in a portion of the bathroom, washroom, kitchen, or the like where water and sewerage works are to be constructed, and a base base portion 35 where repair work is expected after construction. Since the opening 38 is formed in advance and a hot water supply pipe and a gas pipe are formed in the portion of the rising foundation in advance, the number of man-hours for later construction work and repair work can be reduced. Furthermore, since the rising foundation portion formed by the peninsula type foundation and the island type foundation is a structure formed integrally with the base foundation portion of the concrete foundation, they are formed so as not to form an area closed by the rising foundation portion. It can be arranged freely, and the operator can enter all places under the floor, and inspection and construction under the floor can be performed easily.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a basic structure of the present invention.

FIG. 2 is a perspective view of the same basic structure as FIG.

FIG. 3 is a partially enlarged perspective view of the embodiment having the same basic structure as that of FIG. 1;

FIG. 4 is a sectional view showing a conventional foundation structure by a fabric foundation method.

FIG. 5 is a sectional view showing a conventional foundation structure by a solid foundation method.

[Explanation of symbols]

 Reference Signs List 30 foundation 31 recess 32 crushed stone layer 33 moisture-proof sheet 34 concrete foundation 35 base foundation 36 rising foundation 37 reinforcing bar 38 opening 39 opening 40 foundation 41 pillar 42 spacer

Claims (3)

[Claims] A crushed stone layer laid at a predetermined depth in a recess formed by digging a ground surface at a predetermined depth over substantially the entire construction area of a building; A moisture-proof sheet laid up to that, a base foundation portion made of concrete laid at a predetermined thickness on the moisture-proof sheet, and a rising foundation integrally formed on the base foundation portion. The basic structure of a wooden house. 2. An opening for water plumbing which penetrates from a surface of the base foundation portion to a surface of the moisture-proof sheet is formed in a required portion of the base foundation portion of the foundation.
The basic structure of the wooden house described in. 3. An upright base portion rising from the base base portion, the outer base portion being continuously formed along the outer periphery of the building, and a side once connected to the outer base portion. The peninsula-type foundation part, the island-type foundation part formed independently from the peripheral foundation part and the peninsula-type foundation part, and each rising foundation part is arranged so as not to form a closed area, The basic structure of a wooden house according to claim 1.