JPH04228726A - Foundation of building - Google Patents

Abstract

PURPOSE:To facilitate foundation execution work and to obtain favorable adhesion between a foundation and a ground. CONSTITUTION:A foundation is constituted by a footing member 1 placed on a ground and a constructing member 2 made of precast concrete, and the footing member 1 is provided with a space 7 for striking concrete slurry, a mounting face 6A on which the constructing member is mounted and an opening 8 for having the space 7 for placing communicate to the ground, and moreover, a side wall 3 for preventing flow-out of the concrete slurry is provided on both ends of the footing member 1 in the width direction. The constructing member 2 is mounted on the mounting face 6A, the concrete slurry is placed into the space 7 for placing and the footing member 1 is connected to the constructing member 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to concrete foundations for buildings.

0002

[Background Art] A concrete foundation for a building consists of a wide footing at the bottom and a narrow rising part at the top. , there were the following:

[0003] The first method involves assembling a footing part form and a rising part form at a construction site, and pouring concrete slurry inside these forms. The second method involves assembling a formwork for the footing at the construction site, inserting a precast concrete standing member into the formwork, and pouring concrete slurry into the formwork. The third method is to manufacture concrete blocks in which the footing part and the standing part are integrated by a precasting method, and to construct a concrete foundation by arranging a large number of these blocks side by side at the construction site. The fourth work method is to manufacture concrete blocks for the footing part and concrete blocks for the standing part using the precast method, transport them to the construction site, connect them vertically, and install a large number of each block side by side. It creates a foundation.

0004

[Problems to be Solved by the Invention] According to the first and second working methods, it is necessary to assemble and disassemble the formwork at the construction site, which causes problems in terms of workability. In addition, it is necessary to install reinforcing bars vertically and horizontally inside the formwork to increase the strength of the concrete foundation, and this work requires skill, and the number of skilled workers is decreasing. In this respect, too, there was a problem in that construction site work took time. According to the third and fourth work methods, in order to ensure the adhesion of the footing to the ground of the construction site, the upright accuracy of the foundation, and the height accuracy of concrete blocks, the concrete placed on the ground is The problem is that it is necessary to pour mortar to make the surface flat and then place the footing on top of the mortar, which takes time and effort.

[0005] The object of the present invention is to provide a building that can facilitate foundation construction work, omit the work of pouring mortar onto the ground, and yet obtain good adhesion to the ground. It's about providing the basics.

[0006]

[Means for Solving the Problems] A building foundation according to the present invention includes a footing member placed on the ground and an upright member made of precast concrete, and the footing member is formed from both ends in the width direction. The inner side includes a concrete slurry casting space, a rising member mounting surface on which the rising member is placed, and an opening that communicates the casting space with the ground directly below the footing member, and It is characterized in that both ends are provided with side walls that prevent the concrete slurry from flowing outward in the width direction, and the lower part of the upright member is provided with legs that are immersed into the inside of the concrete slurry. .

[0007] In the above, reinforcing bars that are engaged with the legs of the upright member may be arranged on the footing member.

[0008] The footing member may have a peak portion and a valley portion formed in the width direction except for the side walls at both ends in the width direction, or a footing member may have only a valley portion formed in the width direction except for the side walls. In other words, it may have a concave cross section.

Furthermore, the footing member may be provided only on a part of the foundation, or may be provided over the entire foundation.

0010

[Operation] A footing member is placed on the ground, and the rising member is placed on the rising member mounting surface of the footing member. When concrete slurry is cast in the casting space, the slurry does not flow outward in the width direction of the footing member due to the side wall, and the slurry reaches the ground through the opening. When the slurry poured in the pouring space solidifies, the footing member and the slurry form a footing part of the foundation, and this footing part is in good contact with the ground due to the slurry that has reached the ground. Since the legs of the upright member are immersed in the slurry, the footings and the upright member are joined by solidification of the slurry.
As a result, a concrete foundation with a rising part formed by the rising members is completed.

If the footing member is provided with reinforcing bars that are engaged with the legs of the upright member, the reinforcing bars will further increase the strength of the connection between the footing part and the upright part.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a footing member 1 and an upright member 2 according to a first embodiment of the present invention. The footing member 1 is formed of, for example, a precast concrete plate containing glass fiber or carbon fiber, a metal plate such as stainless steel, a plastic plate, etc., and the upright member 2 is made of precast concrete.

Vertical side walls 3 are provided at both ends of the footing member 1 in the width direction, and on the inner side of both ends in the width direction, a bottom portion 4 and an inclined portion 5 are provided from the side walls 3 toward the center in the width direction.
The top part 6 is formed with an opening space 6B whose lower part opens downward, and the top surface of the top part 6 is a flat surface.
This flat surface serves as a rising member mounting surface 6A on which the rising member 2 is placed. While the top part 6 is a mountain part that projects upward, the bottom part 4 between the side wall 3 and the slope part 5 is a valley part, and this part is a pouring space 7 where concrete slurry is poured. It is.

The side wall 3 and the bottom part 4 are continuous in the longitudinal direction of the footing member 1, but the slope part 5 and the top part 6 are discontinuous in the longitudinal direction of the footing member 1. An opening 8 is formed in the center, and because of this opening 8, when the footing member 1 is placed on the ground 9 shown in FIGS. 2 and 3, the pouring space 7 and the ground 9 directly below the footing member 1 are communicate with each other via the opening space 6B.

The upright member 2 is composed of an upper body portion 10 and a lower leg portion 11, and the body portion 10 has a longitudinally elongated shape with approximately the same width as the top portion 6 of the footing member 1. The leg portion 11 has an inverted T-shape in which a narrow portion 11B is provided on a wide portion 11A. A plurality of leg portions 11 are provided separated in the longitudinal direction of the upright member 2, and each leg portion 11 can be inserted into the opening 8 of the footing member 1 from above. The lower surface 10A of the main body 10 between the respective legs 11 is a flat surface as shown in FIG. 2 can be placed on the placement surface 6A.

In this embodiment, as shown in FIG. 2 and FIG.
A reinforcing member 16 consisting of 5 is embedded.

Next, foundation construction work will be explained. Root cutting work is carried out at a construction site where a building such as a house is being constructed.
As shown in FIG. 3, chestnut stones 17 are spread over the ground 9 at the bottom of the root cut to increase the homogenization of the ground 9. Next, the footing member 1 is placed on the ground 9, and the base reinforcements 18 shown in FIG. 2 are placed from the opening 8 on the bottom 4 on both sides of the top 6. After this,
The rising member 2 is lowered from above toward the footing member 1, and the lower surface 10A of the main body part 10 is placed on the mounting surface 6, and the wide part 11A of the leg part 11 is placed on the base reinforcement 18. Then, as shown in FIG. 3, a reinforcing bar 19 made of one bar is passed through the opening space 6B at the bottom of the top 6 of the footing member 1, and this reinforcing bar 19 extending in the longitudinal direction of the footing member 1 and the upright member 2 is inserted. As shown in FIG. 2, it is placed on the wide portion 11A of the leg portion 11 of the standing member 2, and the reinforcing bar 19 is locked to the leg portion 11.

Next, concrete slurry 20 is placed in the placing space 7 of the footing member 1. This pouring space 7
is in communication with the ground 9 through the opening 8, so the slurry 20 passes through the opening 8 and reaches around the legs 11 of the upright member 2, and also reaches the ground 9. For this reason, the surface of the ground 9 is not completely flat,
Even if the surface is uneven, the slurry 20 enters the gap between the ground 9 and the footing member 1, and this gap is filled with the slurry 20. Furthermore, the slurry 20 cast in the casting space 7 does not flow outward in the width direction of the footing member 1 due to the side wall 3, and remains within the footing member 1.

When the slurry 20 solidifies, a concrete foundation 21 is completed. Footing part 2 of this foundation 21
1A is formed by the footing member 1 and solidified slurry 20, and the rising part 21B is formed by the rising member 2. Since the leg portions 11 of the rising member 2 are recessed into the slurry 20, the rising portion 21B is reliably connected to the footing portion 21A by the leg portions 11. In particular, in this embodiment, the leg portion 11 has a wide portion 11A;
Since the reinforcing bars 19 are engaged with the reinforcing bars 19, the strength of the connection between the upright portion 21B and the footing portion 21A is even greater. Further, since the slurry 20 that has entered the gap between the ground 9 and the footing member 1 solidifies as it is, the footing portion 21A is in good contact with the ground 9 over a large area.

As described above, according to this embodiment, after the footing member 1 is placed on the ground 9 of the construction site and the upright member 2 is placed on the footing member 1, concrete slurry 20 is poured into the pouring space 7. Foundation 21 by pouring
Because it is possible to create foundations, there is no need to assemble or disassemble formwork for foundation construction work, making the work easier. Further, the reinforcing bars 19 and the base bars 18 arranged on the footing member 1 are made of bars, and the work of arranging them can be done without requiring any special skill, so the work can be done easily and in a short time.

Furthermore, even if there is a gap between the ground 9 and the footing member 1 as described above, the concrete slurry 20 that has reached the ground 9 from the pouring space 7 through the opening 8 will enter this gap. Therefore, the footing part 2 of the foundation 20
Good adhesion between 1A and the ground 9 can be ensured.In other words, good adhesion with the ground 9 can be ensured without having to pour mortar onto the ground 9 to make the surface completely flat at the construction site. The foundation 21 can be made, and construction site work can be saved accordingly. In addition, the upright accuracy of the foundation 21 is such that when the footing member 1 is placed on the ground 9, the footing member 1
The height accuracy of the foundation 21, which is formed by arranging a plurality of footing members 1 and upright members 2, is obtained by ensuring the horizontal accuracy of each footing member 1 on the ground 9. Obtained by placing it at a height.

The footing member 1 described above may be provided over the entire concrete foundation, or may be provided only on a portion of the concrete foundation.

FIGS. 4 and 5 are plan views showing an embodiment of a concrete foundation in which the footing member 1 is provided only in one part. A plurality of footing members 1 and rising members 2 are arranged in parallel, and elongated members 22, which are foundation beam members, are spanned over both ends of each rising member 2 and connected. This elongated member 22 made of precast concrete is made of precast concrete and has the same height and width dimensions as the upright member 2. As shown in FIG. 5, the reinforcing members 16 and 23 buried inside the upright member 2 and the elongated member 22 have joining fittings 24,
25 is attached, and these joining fittings 24, 2
5 with bolts 26 and nuts 27, the upright member 2 and the elongated member 22 are connected. The work of joining the upright member 2 and the elongated member 22 may be performed before pouring the concrete slurry, or may be performed after the slurry has solidified.

A gap 28 between the joining fittings 24 and 25 is filled with mortar to fill the gap 28. Further, after the concrete slurry solidifies, the soil generated in the root cutting work is placed on the footing member 1, and the gap at the bottom of the elongated member 22 is also filled with this soil, so that the weight of the elongated member 22 is supported.

FIG. 6 shows a footing member 2 according to a second embodiment.
9 and the rising member 30 are shown.

Side walls 31 are provided at both ends in the width direction of the footing member 29, and on the inside of both ends in the width direction, a top portion is formed from the side wall 31 toward the center in the width direction, forming an opening space 32A whose lower part opens downward. 32, an inclined part 33, and a bottom part 34, and the flat upper surface of the bottom part 34 is connected to the upright member 3.
This is a rising member mounting surface 34A for placing 0 on it. Further, the valley portion formed by the bottom portion 34 serves as a pouring space 35 in which concrete slurry is poured. A plurality of openings 36 are formed in the top portion 32 and the sloped portion 33 in the longitudinal direction of the footing member 29, and when the footing member 29 is placed on the ground 9, the openings 36 allow the pouring space 35 to be directly below the footing member 29. It communicates with the ground 9 through the opening space 32A.

The upright member 30 is composed of an upper vertically elongated main body portion 37 and a lower inverted T-shaped leg portion 38, and a plurality of leg portions 38 are formed in a divided state in the longitudinal direction of the upright member 30. As shown in FIGS. 6, 7, and 8, a reinforcement member 44 consisting of an upper end reinforcement 39, an intermediate reinforcement 40, a lower end reinforcement 41, and vertical reinforcements 42, 43 is embedded inside the upright member 30, and a lower end reinforcement 41 is continuously inserted into the inside of each leg 38 in the longitudinal direction of the upright member 30, and as shown in FIG. 6, the lower end reinforcement 41 is exposed to the outside where the leg 38 is not present.

After the footing member 29 is placed on the ground 9, the upright member 30 is placed on the mounting surface 34A at the leg portion 38. After this, as shown in FIG. 8, the opposing openings 36
Reinforcement bar 45 made of a single bar that is also a base bar at the lower end of the
This reinforcing bar 45 is placed on top of the lower end bar 41 exposed to the outside. As a result, the reinforcing bars 45 are locked to the leg portions 38 of the upright member 30 via the lower end bars 41. Next, concrete slurry 20 is poured into the pouring space 35. When this slurry 20 solidifies,
A concrete foundation 46 consisting of a footing member 29, a footing part 46A made of the slurry 20, and a rising part 46B made of the rising member 30 is completed.

This embodiment also simplifies the construction work of the foundation, and the footing part 46A and the rising part 4 by the reinforcing bars 45 are
Footing part 4 due to increased bonding strength with 6B and outflow of concrete slurry 20 from opening 36 to ground 9
Advantages such as good adhesion between 6A and the ground 9 can be obtained.

FIG. 9 shows a third embodiment. The footing member in this embodiment is the same as that shown in the second embodiment. The upright member 47 is provided with an inverted T-shaped leg 49 that continues in the longitudinal direction of the upright member 47 at the bottom of a vertically elongated main body 48. 4
A hole 50 penetrating in the width direction of 7 is formed. After placing the upright member 47 on the mounting surface 34A of the footing member 29, as shown in FIG. Place the part into the opening 36. As a result, the reinforcing bars 51 are locked to the leg portions 49 of the upright member 47. Thereafter, concrete slurry 20 is poured into the pouring space 35, and when this slurry 20 solidifies, the foundation 52 shown in FIG. 10 is completed. The above embodiment also provides the same effects as the first and second embodiments.

In each of the embodiments described above, the footing members 1, 29 have the legs 11, 38 of the upright members 2, 30, 47,
Although reinforcing bars 19, 45, and 51 that are engaged with 49 are arranged, these reinforcing bars 19, 45, and 51 may be omitted. However, if reinforcing bars 19, 45, and 51 are used,
As mentioned above, the effect of increasing the bonding strength between the footing part and the standing part of the concrete foundation can be obtained. Further, the cross-sectional shape of the footing member is not limited to those of the above-mentioned embodiments, and may be arbitrary, for example, it may be a concave shape in which the inner side of both ends in the width direction is a valley portion except for the side walls at both ends in the width direction, Furthermore, the shape of the legs of the upright member is not limited to that of the above embodiment.

FIGS. 11, 12, and 13 show different embodiments of FIG. 5, respectively. In the embodiment of FIG. 11, a long nut 55 coupled to an internal reinforcing member 54 is provided on the upright member 53 disposed on the upper part of the footing member 1, and the upright member 5
An elongated member 56, which is a foundation beam member connected at right angles to 3, is also provided with a long nut 58 coupled to an internal reinforcing member 57. These long nuts 55 and 58 have connection bars 5
The threaded portions 59A, 60A at the ends of the connecting rods 9, 60 are screwed in, and the parallel connecting bars 59, 60 are connected by a ring-shaped connecting member 61. Vertical grooves 62, 63 are formed in the upright member 53 and the elongated member 56, and these vertical grooves 62, 63
Both ends of the partition plate 64 are inserted into the space 65 surrounded by the partition plate 64, the upright member 53, and the elongated member 56, and concrete slurry is poured into the space 65.
It penetrates into the recess 66 formed in the elongated member 56 and solidifies. By solidifying this slurry, the upright member 53 and the elongated member 56 are connected in a wet joint manner. Anchor members 67 are erected on the upright member 53 and the elongated member 56, and the anchor members 67 connect the foundation and the building built on the foundation.

FIG. 12 shows an embodiment in which an upright member 68 and an elongated member 69 are connected by a dry joint method. The upright member 68 and the elongated member 69 are provided with long nuts 72 and 73 connected to internal reinforcing members 70 and 71, and these long nuts 7
2, 73, the threaded portions 74B, 75B of the connecting members 74, 75
is screwed in. Main bodies 74A, 75 of connecting members 74, 75
A is plate-shaped, and the main body 7 is attached to these main bodies 74A and 75A.
Joint plates 76, 7 having a length spanning between 4A and 75A
7, and then connect them with bolts 78 and nuts 79. As a result, the upright member 68 and the elongated member 69 are connected in a dry manner. Thereafter, similar to the embodiment shown in FIG. 11, concrete slurry is poured into a space 81 surrounded by the partition plate 80, the upright member 68, and the elongated member 69.

FIG. 13 shows the case of a foundation applied to a unit house. One end of the upright member 82 and the elongated member 83, in the illustrated example, an end 83A of the elongated member 83 is bent into an L-shape in plan, and a sheath tube 84 is embedded in this end 83A. An anchor member extends downward from the lower end of the column of the housing unit, which is a component of the unit housing, and this anchor member is inserted into a sheath pipe 84 filled with grout material, and each housing unit is constructed as an upright member. 82, disposed on the elongate member 83. As the grout solidifies, the housing unit and the foundation made of the upright member 82, the elongated member 83, etc. are joined together. The downward load of the unit house is transmitted from the pillars of the housing unit to the foundation, and in this embodiment, the downward load of the unit house does not act on the connection point between the upright member 82 and the elongated member 83, and the downward load of the unit house is transmitted to the elongated member 83 integrally. Since the downward load of the unit house acts on the formed planar L-shaped end 83A, the downward load can be effectively supported by the foundation. In addition, in FIG. 13, the upright member 82 and the elongated member 83 are connected by a wet joint method using connecting bars 85 and 86, similar to the embodiment shown in FIG. They may be connected in a similar manner.

[0035]

[Effects of the Invention] According to the present invention, the footing part of the foundation is formed by pouring concrete slurry into the casting space of the footing member, and the rising part is formed by the standing member made of precast concrete. As a result, there is no need to assemble or disassemble the formwork, making foundation construction work easier.Furthermore, the footing members have a structure that connects the concrete slurry pouring space with the ground directly below the footing members. Since an opening is formed to allow the slurry to enter the gap between the footing member and the ground, this allows the slurry to penetrate into the gap between the footing member and the ground. Adhesion, etc. can be reliably obtained, and work on the construction site can be facilitated by eliminating the need for work to flatten the ground surface. In addition, when the standing members are placed on the mounting surface of the footing members, they will be on the ground from this point on, so they can support the weight of the building built on the foundation even before the concrete slurry solidifies. Therefore, building construction work can be started immediately after pouring the concrete slurry, and the construction period can be shortened accordingly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a footing member and an upright member according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1 after the foundation is completed.

[Figure 3] Similarly, III- in Figure 1 after the foundation is completed.
It is a sectional view taken along line III.

FIG. 4 is a plan view showing an example of a completed foundation.

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is a perspective view showing a footing member and an upright member according to another embodiment.

[Figure 7] VII-VII of Figure 6 after foundation completion
FIG.

[Figure 8] VIII-V in Figure 6 also after the foundation is completed
It is a sectional view taken along line III.

FIG. 9 is a perspective view showing a footing member and an upright member according to yet another embodiment.

FIG. 10 is a sectional view taken along the line X-X in FIG. 9 after the foundation is completed.

11 is a partially sectional plan view showing another embodiment of FIG. 5; FIG.

12 is a partially sectional plan view showing still another embodiment of FIG. 5; FIG.

FIG. 13 is a diagram showing another embodiment of FIG. 5 in the case of a foundation of a unit house.

[Explanation of symbols]

Claims (2)

[Claims] [Claim 1] The footing member includes a footing member placed on the ground and a rising member made of precast concrete, and the footing member has a concrete slurry casting space inside from both ends in the width direction, and a rising member made of precast concrete. It has a rising member mounting surface on which the member is placed, an opening that communicates the casting space with the ground directly below the footing member, and a structure at both widthwise ends that prevents the concrete slurry from flowing outward in the widthwise direction. A foundation for a building, comprising a blocking side wall, and a lower part of the upright member is provided with a leg part immersed in the concrete slurry. 2. The foundation of a building according to claim 1, wherein reinforcing bars that are engaged with the legs of the upright member are arranged on the footing member.