JPH08105062A - Footing structure and executing method thereof - Google Patents

Abstract

PURPOSE: To provide a footing structure that is able to simplify the construction work of foundation in omitting a bundle footing and an individual footing, capable of improving the extent of dimensional accuracy, and of securing the maintenance of strong rigidity extending over a long period of time. CONSTITUTION: Plural pieces of precast concrete wall plates 20 mounted on each of footing parts 16 are installed in space between two sides of a precast concrete strip footing 10 erected in parallel with other. This PC wall plate 20 is made of precast concrete and formed into a rectangular parallelopipedic structure, and a notch 24 is installed in the cross direction side face 20a and a pedestrian port 22 in the side, respectively. This notch 24 is installed almost in the center of a distance between two elections, and the pedestrian port 22 is installed in a position being slightly more deflected than a central part. A floor beam 30 is installed in space between these two PC wall plates 20, and it is inserted into the notch 24 of the PC wall plate 20 and joined and locked by two anchor bolts 34 and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure constructed on the ground of a building and a construction method of the foundation, and more particularly to a foundation structure and a construction method of the foundation which can omit a bundle foundation or an independent foundation.

[0002]

2. Description of the Related Art Houses have been industrialized from the standpoint of difficulty in securing skilled workers involved in on-site construction, shortening of construction period, and uniformization of house quality. That is, it is attempted to increase the degree of completion of parts in the factory as much as possible and reduce the work items on the construction site.

As an industrialization of this house, there is known a method of precasting a foundation of a building in a factory in advance and using the precast (hereinafter abbreviated as PC) foundation to construct the foundation at a construction site. Has been. For example, the foundation for supporting the floor on the first floor was constructed by the PC foundation construction method as shown in FIG.

That is, in the figure, an outer cloth foundation 80 is constructed at the outer peripheral position of the building, and a pedestal wheel (not shown) is laid on the outer cloth foundation 80 and the inner cloth foundation 82. Then, the outer cloth foundation 80 and the inner cloth foundation 8
A bundle foundation 84 is constructed between the two, and a floor support material 86 is mounted on the bundle foundation 84. For example, in the panel gazette, a floor panel is laid on the foundation thus constructed, and a semi-base (not shown) is attached to the outer end of the floor panel to construct the floor portion of the first floor.

Here, the bundle foundation 84 attaches a floor support 86 to support the floor panel.
In order to build No. 4, it was troublesome because it required laying split stones and driving piles. Moreover, since the bundle foundation is scattered like the cloth foundation instead of being continuous, the foundation groundwork was troublesome. Further, it is necessary to adjust the horizontal level for each of the many bundle foundations 84, and the work is complicated.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its purpose is to eliminate the bundle foundation and to simplify the construction work of the foundation. And to provide a foundation construction method.

Another object of the present invention is to provide a foundation structure and a foundation construction method capable of improving the mounting dimension accuracy of a floor beam while simplifying the horizontal level adjustment work.

Still another object of the present invention is to provide a foundation structure and a method of constructing a foundation, which enables strong joining and fixing to a floor placed on a foundation and can maintain strong rigidity for a long period of time. To provide.

[0009]

According to a first aspect of the present invention, there is provided a foundation structure in which a plurality of precast concretes are installed at predetermined intervals at root cutting portions formed by continuously excavating the ground in a building construction area. A precast concrete that has a bottom plate, a rising part that stands upright in the vertical direction to support the building, and a footing part that projects laterally from the lower part of this rising part, and is installed in parallel between the precast concrete bottom plates. A floor beam that is installed between the parallel precast concrete foundations by placing both ends on the footing portion of each of the concrete foundations and the parallel precast concrete foundations, and is placed between the precast concrete foundations. And a precast concrete wall board for supporting.

According to a second aspect of the present invention, in the first aspect, the precast concrete wallboard is cut at an upper end surface that is substantially flush with the upper surface of the rising portion, and cut from the upper end surface by the thickness of the floor beam. The floor beam, which has a notch portion and which is arranged in parallel to the precast concrete foundation between the foundations, is supported by the notch portion.

According to a third aspect of the present invention, in the first aspect, the precast concrete wall board has an upper end surface that is lower than an upper surface of the upright portion by a thickness of the floor beam. The floor beam arranged orthogonally to the foundation is supported by the upper end surface.

[0012] The invention of claim 4 is the precast concrete foundation according to any one of claims 1 to 3,
It is characterized in that a groove portion into which an end portion of the precast concrete wall plate is inserted is provided on a side surface of the rising portion.

A fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the precast concrete wall board has a humanitarian opening that penetrates from one side surface to the other side surface.

A method of constructing a foundation according to the invention of claim 6 is
The process of installing a plurality of precast concrete bottom plates at predetermined intervals in the root cutting part formed by continuously excavating the ground in the construction area of the building, and the rising part that vertically stands upright to support the building, and this standing part. A step of laterally projecting a precast concrete foundation having a footing portion protruding laterally from a lower part of the upper part, and a step of installing a plurality of precast concrete foundations in parallel between the precast concrete bottom plates, and above the footing portion of each of the parallel precast concrete foundations. And placing both ends of the precast concrete wallboard and erecting the precast concrete wallboard at right angles to the precast concrete foundation.

[0015]

According to each of the first and sixth aspects of the invention, the precast concrete wall boards manufactured in advance at the factory stage are installed between the facing footing parts at the construction site,
If the floor beam can be attached and fixed to the precast concrete wall board, the floor beam can support the floor beam, so that it is possible to omit the bundling foundation and the independent foundation of the conventional technology, which are complicated in the earthwork work and the horizontal level work. In addition to the construction work, it is not necessary to perform ground work and crushed stone compaction, so the process of foundation work can be shortened, and the work of building the foundation at the construction site can be simplified and speeded up.

Further, by adjusting the horizontal level of the precast concrete bottom plate, it is possible to ensure the accuracy of the horizontal level of the footing portion of the precast concrete foundation installed thereon, that is, the mounting surface of the precast concrete wall position. Therefore, the horizontal level adjustment of the precast concrete wallboard having the reference surface for supporting the floor beam is unnecessary or simplified.

Moreover, since the foundation portion can be framed by the precast concrete foundation and the wall plate, and the floor structure can be made small, the strength against horizontal load and vertical load is increased, and the fulcrum is supported on the ground. Since the distance between the fulcrums can be made smaller, the structural yield strength can be increased, the floor load can be safely transmitted to the foundation, and the effects such as excellent heat insulation and durability can be expected.

Further, when the panel construction method is adopted, for example, the arrangement position of the precast concrete wall boards is set according to the installation direction and the number of floor panels suitable for the room structure so that the structural yield strength corresponding to the room structure can be improved. The strength can be secured.

Further, since the precast concrete wall boards are not united with concrete like continuous foundations and each precast concrete wall board is assembled and joined on site, the number of members at the construction site is reduced, and the construction work is performed. Can be expected to simplify the work and is highly economical.

In each of the second and third aspects of the present invention, the floor beams arranged between the two precast concrete foundations in parallel or at right angles to the foundations can be supported by the precast concrete wall boards.

According to the invention of claim 4, the groove portion is formed on the side surface of the precast concrete foundation, whereby the positioning of the precast concrete wall board is facilitated, and furthermore, by placing it in the groove portion, the foundation and the wall board can be formed. The joint can be strengthened.

According to the fifth aspect of the present invention, the precast concrete wall board for partitioning the space in the two precast concrete foundations is provided with the human passage opening, so that the piping and maintenance work after the floor construction can be performed.

[0023]

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

Example 1 In a part of the structure of a foundation that has been erected and formed in a building construction area, a basic structure in which a floor beam is arranged parallel to an outer peripheral fabric foundation will be described with reference to FIGS. 1 and 2. .

FIG. 1 is a perspective view in which a part of the basic structure according to the first embodiment is cut away. FIG. 2 is a perspective view showing a state in which the floor panel 40 is placed on the PC cloth foundation 10 in FIG.

FIG. 1 shows a state in which two precast concrete (hereinafter referred to as PC) cloth foundations 10 manufactured in advance at a factory stage are constructed in parallel with each other.
A plurality of PC bottom plates (not shown) are installed at the corners of the root cutting part formed by dug the ground and at predetermined positions between the corners, and the PC cloth foundation 1 is provided between the PC bottom plates.
0 is erected. Further, in FIG. 1, for example, one PC
The cloth foundation 10 is constructed along the outer periphery of the building, and the other P
The C cloth foundation 10 is built inside the building.

The PC cloth foundation 10 has a rising portion 12, a groove portion 14, and a footing portion 16.

The upright part 12 stands upright in the vertical direction and mounts and supports the building on the upper end face 12b. The upright part 12 is formed in a rectangular parallelepiped shape with a predetermined length and thickness, and is provided inside for reinforcement not shown. The steel bars are reinforced and are buried in concrete.

The groove portion 14 has two Ps that are erected parallel to each other.
It is formed on the opposite side surfaces 12a of the C cloth foundation 10 at predetermined intervals, and its groove width is kept slightly longer than the thickness of the PC wall board 20 described later, so that the PC wall board 20 described later can be fitted. There is.

The footing portion 16 supports the rising portion 12 so as to stand upright, and both side surfaces 12 of the rising portion 12 are supported.
It is formed so as to project laterally at a right angle from the lower ends of a and 12c. The footing portion 16 is integrally or separately formed from the rising portion 12 and is made of reinforced concrete, and its upper surface 16a is horizontal and smooth. Also,
The footing portion 16 is provided with a concrete filling opening 18 which is open on the upper surface 16a thereof.

The concrete filling port 18 is a plurality of rectangular holes penetrating from the upper surface 16a to the lower surface of the footing portion 16 and is formed at predetermined intervals. The concrete filling port 18 is cured by pouring and solidifying the concrete. The footing portion 16 can be firmly fixed to the ground 70.

Between the two sides of the PC cloth foundation 10 which are erected in parallel with each other, a PC wall plate 20 is installed, the both ends of which are supported and erected on the footing portion 16. Also,
Both ends of the PC wall plate 20 are fitted into the groove portions 14 of the PC cloth foundation 10.

The PC wallboard 20 is the PC cloth foundation 10 described above.
Similarly to the above, it is made of PC and has a rectangular parallelepiped structure, and its thickness is almost the same as that of the PC cloth foundation 10. Also, the PC wall board 2
The height of 0 is P from the upper end surface 16a of the footing portion 16
It is the same as the distance to the upper end surface 12b of the C cloth foundation 10. As a result, the upper end surface 12b of the PC cloth foundation 10 and the P
The upper end surface 20a of the C wall plate 20 is flush. And PC
Since the lower end surface of the wall plate 50 is a smooth surface, it can be stably placed on the upper end surface 16a of the footing portion 16.

A notch 24 is formed on the upper end side surface 20a of the PC wall plate 20, and the humanitarian entrance 2 is formed on the side surface 20b.
2 is formed through.

The notch 24 allows the floor beam 30 to be installed between the PC wall plates 20. In the first embodiment, the notch depth of the notch 24 is equal to the thickness of the floor beam 30. The humanway entrance 22 is provided so that a person can enter and exit before and after the construction work at the construction site. Further, in FIG. 1, the notch 24 is provided substantially at the center of the distance between the installations, and the human passage 22 is provided at a position slightly offset from the central portion. The position of the humanitarian opening 22 is not limited to this, and a plurality of positions may be provided at any position on the PC wallboard 20. Further, the size may be any size as long as it can pass a person.

A floor beam 30 is installed between a plurality of PC wall plates 20 installed between the PC cloth bases 10, and is inserted into the cutout portion 24 of the PC wall plate 20, and a mounting bolt 34 (anchor bolt, etc.) is installed. The floor beam 30 and the PC wall board 20 are fixedly attached by the above.

The floor beam 30 is provided to support the floor panel 40 shown in FIG. 2, and the material thereof may be wood. However, in view of the recent high value of wood, a plurality of wood pieces are used. It is possible to use a laminated laminated material or a steel material such as an H-shaped steel. The use of steel also has the advantage that no ant-proof treatment is required.

Further, the floor beam 30 and the PC wall board 20 can be attached and fixed easily with the floor beam 30 by using attachment bolts (anchor bolts or the like) provided in the notches 24 of the PC wall board 20. It can be done. That is, the floor beam 30
As shown in FIG. 1, a mounting plate is provided at several notches or ends, and mounting bolts (anchor bolts, etc.) are inserted through the mounting holes formed in the mounting plate to attach the nut to the nut. The floor beam 30 can be attached and fixed to the PC wall board 20 by fixing the floor beam 30. Instead of using nuts,
An insert member having a female screw may be embedded in the upper end surface of the cutout portion 24 of the PC wall plate 20, and a bolt may be screwed into the female screw to attach and fix the floor beam 30.

By attaching and fixing the floor beam 30 and the PC wall plate 20, the upper surface 30a of the floor beam 30 and the upper surface 2 of the PC wall plate 20 are fixed.
It is flush with 0a and forms the support surface of the floor panel 40. In addition, the floor beam 30 is notched in a region where the floor beam 30 is attached, and the heads of nuts or bolts used for fixing the floor beam 30 do not project above the upper surface 30a.

Next, the distance between the PC wall boards 20 and the floor panel 4
The relationship with the width of 0 will be described based on FIGS. 1 and 2.

As shown in FIGS. 1 and 2, floor panel 20.
Let A be the length of the short side and B be the length of the long side. At this time, 2
The distance between two parallel PC wall plates 20 is nA (however, n
Is a natural number), PC cloth foundation 10 and PC
When n floor panels 40 are placed on the wall plate 20, the width A of the floor panels 40 can be matched, and the floor structure can be reduced, so that the structural strength of the foundation portion is strengthened. Further, it is possible to prevent the floor beam 30 (large pull) from bending. When the floor beam 30 has the conventional bending rigidity, n = 1
It is preferable to set to ~ 3.

The floor panel 4 is attached to the PC cloth foundation 10.
In the case of FIG. 2 in which the short side A of 0 is installed in parallel, the floor beam 30 comes to the center of the long side distance B of the floor panel 40, so that the structural proof strength after fixing is strengthened. When the distance between the PC wallboards 20 is reduced in advance in order to secure structural strength, the distance between the PC wallboards 20 may be set to n times the short side dimension A of the floor panel 40.

Further, since the PC wallboard 20 and the PC cloth foundation 10 are framed, it is possible to secure a fulcrum on the ground where the strength against horizontal load and vertical load is increased, and the distance between the fulcrums is reduced, so that the structural strength is increased, The floor load can be safely transmitted to the base.

Further, since the PC wall board 30 is placed on each PC member (in this case, the footing portion 16 of the PC cloth foundation 10) whose level is adjusted in advance, the dimensional accuracy of the supporting surface for supporting the floor beam 30 is improved. improves.

Further, unlike the continuous foundation, the PC wallboards 30 are not united with concrete but are unitized and the respective PC wallboards 30 are assembled and joined on site, so that the number of members at the construction site is reduced and the construction is carried out. It can be expected to simplify the work.

Next, the operation of this embodiment, that is, the construction method will be described with reference to FIGS. 1 and 2.

The PC cloth foundation 10 and the PC wallboard 20 are manufactured in advance at the factory stage and transported to the construction site. The surfaces of the PC cloth foundation 10 and the PC wallboard 20 are preliminarily processed at the factory stage. Further, the length of the PC wall plate 20 in the longitudinal direction is set and manufactured in a factory stage so as to be substantially equal to the long side distance B of the floor panel 40.

At the construction site, the ground is dug to form a root cutting portion, and the PC bottom board is installed at a corner portion and a predetermined position of the root cutting portion.

When the PC bottom plate is installed at the root cutting portion, the mortar pile is placed at the installation position of the PC bottom plate, and the PC bottom plate is placed so as to crush the mortar pile. Then, this PC bottom board is hit with a hanging arrow or the like to perform an adjusting operation so that the upper surface becomes substantially horizontal at a predetermined height. This work is performed while checking the horizontal level and height using a water thread, a level, or a leveling device using a laser beam.

Next, the PC cloth foundation 10 is installed between the PC bottom boards. At this time, since the PC bottom plate is already installed horizontally at a predetermined height, the PC cloth foundation 10 becomes horizontal at a predetermined height simply by being installed between the PC bottom plates. Therefore, the installation work of the PC cloth foundation is completed only by marking out the installation position of the PC cloth foundation on the upper surface of the PC bottom plate and placing it while checking only the installation position. Therefore, this PC cloth foundation can be placed on the PC bottom board by using the lower end surface of the concave portion as the erected portion. Then, the adjacent PC cloth foundations are joined together by a jig (not shown), the reinforcing bars are arranged inside the recesses, concrete is poured, and the PC cloth foundations are connected to each other to construct a building foundation. .

At this time, the other PC cloth foundation 10 installed in parallel with the one PC cloth foundation 10 is constructed so that the pitch between the PC cloth foundations 10 becomes equal to the long side distance B of the floor panel 40. It

Further, since the footing portion 16 is integrally formed in advance at the lower part of the PC cloth foundation 10 at the factory stage, it is not necessary to construct the footing at the construction site.
Like the C cloth foundation 10, the upper end surface of the footing portion 16 is horizontal and smooth.

When the PC cloth foundation 10 is installed and fixed in this way, as shown in FIG. 1, the PC wallboard 20 is provided between the one PC cloth foundation 10 and the other PC cloth foundation 10 and each of the PC cloth foundations 10 is fixed. It is installed on the footing part 16 of 10.

At this time, both ends of the PC wall plate 20 are fitted into the groove portions 14 of the PC cloth foundation 10. After that, both ends of the PC wall board 20 are fixed to the PC cloth foundation 10 by placing concrete in the grooves 14 of the PC cloth foundation 10. Then, this fixing work is performed by the PC cloth foundation 10 and the PC wall board 2.
It is most efficient to do this after installing 0 and before installing the floor beam 30.

Specifically, concrete is poured into the concrete filling opening 18 formed in the footing portion 16 to fix and harden the footing portion 16 on the ground 70, and at the same time, to fix the PC wall board. It is enough to fix the lower end of 20 with concrete. Also, PC wall board 2
It is preferable that anchor bolts or anchor rebars are provided below 0, and these are integrally fixed to concrete.

Further, when the PC cloth foundation 10 is laid on the PC bottom board, a gap is formed between the ground 70 and the footing portion 16. Therefore, when the concrete is placed, the concrete penetrates through the gap and the concrete becomes the concrete. Filling port 18
It can be surely filled with concrete by confirming that it is filled from below and overflowed from the upper end.

Compared with the work of constructing the entire footing at the construction site, this work requires a small amount of concrete to be placed, so that the curing period is short and if the concrete is placed, cured and solidified, the footing portion 16 Can be firmly fixed to the ground 70.

Thus, the PC cloth foundation 10 and the PC wall board 20
After the fixing and fixing of the floor beams 30 are performed, the floor beams 30 are inserted and installed in the cutout portions 24 of the PC wall plates 20, and the floor beams 3 are provided between the PC wall plates 20.
Build 0. After that, with anchor bolts, etc., PC
The wall plate 20 and the floor beam 30 are joined and fixed.

Then, as shown in FIG. 2, the PC cloth foundation 1
The floor panel 40 is bonded and fixed onto the 0, the PC wall plate 20, and the floor beam 30. At this time, the distance between the PC wall plates 20 is preset to n times the short side distance A of the floor panel 40 (n is the number of floor panels). Also, the floor panel should be installed from the center of the building to reduce the installation error.

As described above, according to this embodiment, the PC wall boards 20 manufactured in advance at the factory stage are installed between the facing footing parts 16 at the construction site, and the floor beams 30 are attached to the PC wall boards 20. If fixed, the floor beam 30 can support the floor, so that the bundle foundation 84 as shown in the conventional example of FIG.
And independent foundations can be omitted.
Since it is unnecessary to compact crushed stones, the process of foundation work can be shortened, and the work of constructing the foundation at the construction site can be simplified and speeded up.

Further, unlike the conventional example shown in FIG. 5, the horizontal level adjustment of the bundle foundation and the independent foundation had to be made separately from the PC cloth foundation, whereas in this embodiment, the PC cloth foundation 1
By adjusting the horizontal level of 0, the horizontal level of the PC wallboard 20 can also be adjusted. That is, the smooth upper surface 16a of the footing portion 16 of the PC cloth foundation 10 preliminarily dimensioned at the factory stage has high dimensional accuracy and is preliminarily leveled before the PC wallboard 20 is installed. ing. Since the precast PC wallboard 20 having high dimensional accuracy is installed on the upper surface 16a of the footing portion 16, it is not necessary to adjust the horizontal level of the PC wallboard 20. As described above, according to the present embodiment, it is possible to secure the dimensional accuracy of the support surface of the floor beam 30 while simplifying the labor of horizontal level adjustment and improving the work efficiency.

Further, since the footing portion is not formed on the lower portion of the PC wall board 20, the PC wall board 20 is light in weight, so that it can be easily transported to the construction site. Further, the arrangement position of the PC wallboard 20 is set according to the direction and the number of floor panels suitable for the room structure, and the PC wallboard 20 is fixed by being fitted in the groove portions 14 of the PC cloth foundation 10 provided at predetermined intervals in advance. By doing so, it is possible to secure the strength of structural proof strength according to the room structure.
In addition, the PC wallboard 20 is n times the short side dimension A of the floor panel 40.
Since it is only necessary to set the distance, the floor panel 40 can be effectively used and the economy is excellent. In addition, when the floor beam 30 is made of steel, the strength of the member is strengthened, and the structural yield strength is further strengthened, so that the cost can be reduced as compared with the wood which is difficult to obtain.

Second Embodiment Next, a second embodiment according to the present invention will be described with reference to the drawings. The members having substantially the same structure as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In a part of the structure of the foundation that has been raised in the building construction area, the basic structure in the case of arranging the floor beams at right angles to the peripheral cloth foundation will be described with reference to FIGS. 3 and 4.

FIG. 3 is a perspective view in which a part of the basic structure according to the second embodiment is cut away. FIG. 4 is a perspective view showing a state in which the floor panel 40 is placed on the PC cloth foundation 10 in FIG.

Similar to the first embodiment, the PC wall board 50 is installed between the two parallel PC cloth bases 10. PC
Similar to the PC cloth foundation 10, the wall plate 50 is made of PC and has a rectangular parallelepiped structure, and the thickness thereof is substantially the same as that of the PC cloth foundation 10. Further, the height is a distance obtained by subtracting the thickness of the floor beam 60 from the distance from the upper end surface 16a of the footing portion 16 to the upper end surface 12b of the PC cloth foundation 10. Thereby, when the floor beam 60 is attached and fixed to the upper end surface of the PC wall plate 50, the upper end surface 12b of the PC cloth foundation 10 and the upper end surface 60a of the floor beam 60 are flush with each other. Since the lower end surface of the PC wall plate 50 is a smooth surface, it can be stably placed on the upper end surface of the footing portion 16.
Further, the PC wall board 50 is also provided with a human entrance 52 on the side surface in the longitudinal direction.

Next, the distance between the PC wall boards 50 and the floor panel 4
The relationship with the width of 0 will be described based on FIGS. 3 and 4.

As shown in FIGS. 3 and 4, floor panel 40.
Let A be the length of the short side and B be the length of the long side. At this time, 2
If the arrangement pitch between two parallel PC cloth foundations 10 is set to nA (where n is a natural number), the PC cloth foundation 10
Also, when n floor panels 40 are placed on the PC wall board 50, the width A of the floor panels can be matched, and the floor construction surface can be reduced, so that the structural strength of the foundation portion is strengthened. Particularly, since the floor beam 30 is attached and fixed on the PC wall plate 50, the strength is further increased as compared with the first embodiment.

The floor panel 4 is attached to the PC cloth foundation 10.
When the short side A of 0 is installed at a right angle, both end portions of the long side distance B of the floor panel 40 are supported by the PC wall board 50.
The structural yield strength after fixing is strengthened. On the contrary, when the distance between the PC cloth foundations 10 is reduced in advance in order to secure the structural strength, the pitch between the PC cloth foundations 10 may be set to n times the short side dimension A of the floor panel 40. Panel 40
Can be used effectively.

Further, the distance between the PC wall boards 50 is set to the floor panel 40.
By adjusting to the long side distance B of the above, or by setting it to be the long side distance B or less, the floor structure can be further reduced, and the structural strength of the foundation portion is strengthened.

The construction method in this embodiment employs a method of assembling the PC cloth foundation 10 and the PC wallboard 50 manufactured in advance at the factory stage at the construction site, as in the first embodiment.

The effects of the second embodiment are the same as those of the first embodiment.
Although the same effect as described above is obtained, since the PC wall plate 50 is provided under the floor beam 60, the strength is further increased as compared with the first embodiment.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, it goes without saying that a construction method other than the panel construction method of the above-mentioned embodiment can be adopted for the construction of the floor portion on the foundation constructed according to the present invention.

[0074]

According to the inventions of claims 1 to 6, it is possible to omit the bundle foundation, the independent foundation, etc., which respectively require the earthwork work and the horizontal level adjustment work, and to simplify the on-site construction. In addition, since the foundation part can be framed and the floor structure can be made smaller, the strength against horizontal load and vertical load is increased, and fulcrums can be created on the ground, and the distance between fulcrums is small. Therefore, it is possible to obtain an effect such as an increase in structural yield strength.

[Brief description of drawings]

FIG. 1 is a perspective view in which a part of a basic structure according to a first embodiment of the present invention is cut away.

FIG. 2 is a perspective view showing a state in which a floor panel is placed on the PC cloth foundation in FIG.

FIG. 3 is a perspective view in which a part of a basic structure according to a second embodiment of the present invention is cut away.

FIG. 4 is a perspective view showing a state in which a floor panel is placed on the PC cloth foundation in FIG.

FIG. 5 is a schematic perspective view of a conventional foundation.

[Explanation of symbols]

 10 PC cloth foundation 12 Vertical part 14 Groove part 16 Footing part 18 Concrete filling port 20, 50 PC wall plate 22, 52 Human way entrance 24 Notch part 30, 60 Floor beam 34 Mounting bolt 70 Ground

Claims (6)

[Claims] 1. A plurality of precast concrete bottom plates installed at predetermined intervals in a root cutting portion formed by continuously excavating the ground in a building construction area, and an upright portion which stands vertically and supports the building. And a footing portion that projects laterally from the lower part of the rising portion, and a plurality of precast concrete foundations that are installed in parallel between the precast concrete bottom boards, and the foot of each of the parallel precast concrete foundations. A precast concrete wall board that is installed between the precast concrete foundations that are parallel to each other and that supports the floor beams that are arranged between the precast concrete foundations, by placing both ends on the towing portion. Foundation structure to do. 2. The precast concrete wall plate according to claim 1, wherein the precast concrete wall plate has an upper end surface that is substantially flush with the upper surface of the upright portion, and a cutout portion cut out from the upper end surface by the thickness of the floor beam. And the floor beams arranged between the precast concrete foundations in parallel with the foundations are supported by the notches. 3. The precast concrete wallboard according to claim 1, wherein the precast concrete wallboard has an upper end surface lower than an upper surface of the rising portion by a thickness of the floor beam, and is orthogonal to the precast concrete foundation between the foundations. A foundation structure, characterized in that the floor beams arranged as a structure are supported by the upper end surface. 4. The foundation structure according to claim 1, wherein the precast concrete foundation has a groove portion on a side surface of the rising portion into which an end portion of the precast concrete wall board is inserted. 5. The foundation structure according to any one of claims 1 to 4, wherein the precast concrete wall board has a human way opening that penetrates from one side surface to the other side surface. 6. A step of installing a plurality of precast concrete bottom plates at a predetermined interval in a root cutting part formed by continuously excavating the ground in a building construction area, and a vertical standing upright to support the building. A step of installing a plurality of precast concrete foundations having an upper portion and a footing portion projecting laterally from the lower portion of this rising portion in parallel between the precast concrete bottom boards, and each of the parallel precast concrete foundations A step of placing both ends of the precast concrete wall board on the footing part and erecting the precast concrete wall board at a right angle to the precast concrete foundation.