JP2996569B2 - Precast concrete foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a precast concrete foundation. More specifically, the present invention relates to a precast concrete foundation including a base body made of a long body and a rod-shaped anchor bar mostly embedded in the base body.

[0002]

2. Description of the Related Art Hitherto, the foundation of a building has been manufactured by arranging reinforcement at a construction site, assembling a formwork outside the arrangement, and pouring concrete into the formwork. And the building was being built on this foundation. However, such a method of constructing a foundation is cumbersome because there are many operations on site,
Another problem is that the building cannot be built until the concrete is hardened. Therefore, recently, 1-6123
No. 9, JP-A-1-61241, JP-A 1-1
As described in Japanese Patent No. 41843, a foundation is manufactured in advance at a factory or the like, and is installed on a construction site.
So-called precast concrete foundations have been used. This precast concrete foundation consists of a base body consisting of a long body, and a rod-shaped anchor bar that is mostly embedded in this foundation body, and transports this precast concrete foundation to the construction site, After installing a plurality of joints, the joints of the anchor bars appearing on the surface and the joints of the anchor bars of the adjacent precast concrete foundation are joined to form a foundation. is there.

[0003]

Generally, in order to firmly join a base body with an anchor bar, it is necessary for the anchor bar to have a large anchoring strength. In order to obtain the anchoring strength required for joining the anchor bar, it is necessary to embed the anchor bar in the base body to a depth of 40 times the thickness of the anchor bar used. For example, in a precast concrete foundation, an anchor bar having a diameter of 13 mm is usually used. In the case of an anchor bar having a diameter of 13 mm, the anchor bar in the foundation body is 40 times as large as 13 mm.
It must be embedded at a depth of 0 mm. The precast concrete foundation is formed by joining the foundation body consisting of a long body with anchor bars, but the foundation is not only a straight part,
There are portions that intersect in various shapes such as T-shape, + -shape, and L-shape.

When the precast concrete foundation is joined in a straight line, anchor bars are buried in the elongate direction at a desired depth from the end face, for example, at a depth of 520 mm or more, in the elongate body. If the anchor bars are joined together, they can be joined firmly. However, T-shaped,
In the place where it crosses in a + -shape or L-shape, it is necessary to join the end face of the long base body to the side face of the adjacent base body. The desired depth from the side, for example 520 mm
Therefore, anchoring strength of the anchor streaks cannot be sufficiently obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a precast concrete foundation capable of joining an adjacent foundation body to a side face of the foundation body with an anchor bar having sufficient anchoring strength.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and to achieve the above object.
In a precast concrete foundation comprising a base body made of a long body and a rod-shaped anchor bar mostly embedded in the base body, the anchor bar is embedded in a width direction embedded in the base body. The anchoring portion consists of a connecting portion in which the anchor streaks are exposed on the side surface of the base body. It is provided.

When installing this precast concrete foundation at a place where it crosses in an L-shape or T-shape,
Since the end face of the adjacent foundation body may be joined to one side surface of the foundation body, the precast concrete foundation installed in such a place may increase the anchoring strength of the anchor bar to the precast concrete foundation joined to one side surface. . In other words, the anchoring strength of the anchor bars embedded in the width direction of the base body may be increased with respect to one. As described later, the anchoring strength of the anchor stud to which the fixing plate is attached increases as the length of the anchor streak from the side surface to the fixing plate increases. Therefore, the precast concrete foundation to be installed at such a location may be provided with a fixing plate at a location as far as possible from the mounting portion exposed on the side surface. That is, as in the second aspect of the present invention, the anchoring bar may be embedded in the width direction of the base body from the mounting portion, and the fixing plate may be provided at a location beyond the center of the base body.

When the precast concrete foundation is installed at a place where the precast concrete foundation crosses in a T-shape or a + -shape,
Since it is necessary to join the end faces of the adjacent foundation bodies to both sides of the foundation body, the precast concrete foundation installed in such a place has the same anchoring strength of anchor bars embedded in the foundation body as to both sides Need to be strong.

[0008] Therefore, the precast concrete foundation to be installed in such a place needs to be provided with connecting portions on both sides and fixing plates at substantially equal distances from both side walls. That is, in order to connect the adjacent precast concrete foundation to both sides of the precast concrete foundation, the embedding portion where the anchor reinforcement is embedded in the width direction in the foundation body, and both ends of the anchor reinforcement appear on both side surfaces. The anchoring plate is provided at the center of the anchoring bar in order to make the anchoring strength of the anchoring bar to the precast concrete foundation connected to both sides substantially equal to the anchoring bar. Or
Alternatively, as in the fourth aspect of the present invention, 2
It is preferable to provide two fixing plates. In addition, when the anchoring strength of the anchor streaks is insufficient even when the fixing plate is provided in the embedding portion, the width of the base body near the place where the anchor streaks are embedded may be made wider than other portions.

[0009]

In the precast concrete foundation of the present invention, the fixing plate is provided in the embedded portion of the anchor bar so that the plate surface of the fixing plate is substantially perpendicular to the bar-shaped anchor bar.
The anchoring strength of the anchor streaks can be smaller than that of the conventional case where no anchoring plate is provided. That is, the anchoring strength P of the anchor bar provided with the anchoring plate is expressed by the following equation. (Architectural Institute of Japan ed., "Various synthetic structure design guidelines, the commentary Part 4 various anchor bolt design guideline" ^{_{reference) P = 0.6 × F c 1/2}} × A c However, A _c is cone-shaped fracture surface of concrete The effective vertical projected area _Fc is the design standard strength of concrete. For example, as shown in FIG. 3A, anchor bars are embedded in the width direction at a depth of 95 mm from the upper surface of the concrete foundation and 172 mm from the end surface. radius 55mm from the side to the anchor muscles to the location of 160 mm, the case in which the disc-shaped fixing plate having a thickness of 30mm, the effective projected area a _c of the conical fracture surface of the concrete will be 1049cm ² (the effective projected area a _c is conical surface divergent obtained by 45 ° inclined from the periphery of the fixing plate may be Hakare the area of the side surface of the foundation surrounded by the lines intersecting the side surface of the concrete foundation).

The design standard strength F _c of concrete is 1
Since it is 80 kg / cm ² , when calculated from this A _c and F _c , the fixing strength P is 7602 kg, which is almost equal to the tensile strength of two 13 mm anchor streaks. Therefore, it can be seen that providing anchor streaks under such conditions provides sufficient strength. As described above, the conventional embedding depth of the anchor streaks of 520 mm was required only for the anchor streaks of 13 mm, but when the fixing plate is attached, the depth of 160 mm is sufficient. And this 160mm
Is the length that can be taken in the width direction of a normal precast concrete foundation.

Further, in the case of a precast concrete foundation which is installed at an intersection of an L-shape or a T-shape, it is only necessary that the anchoring strength against the adjacent precast concrete foundation attached to one side is large, so that the anchor bar is connected from the connection part. It is preferable that the fixing plate is provided in a location that is embedded in the width direction of the base body and that exceeds the center of the base body. That is, as described above, the anchoring strength of the anchor streaks increases as the embedding depth increases (the effective vertical projection area Ac increases as shown in (b) of FIG. 3). At times, a precast concrete foundation having a fixing plate at a location beyond the center has a larger anchoring strength than a precast concrete foundation having a fixing plate at the center. In other words, when manufacturing a foundation of anchoring strength of the same anchor bar, the precast concrete foundation provided at a position beyond the center of the fixing plate is more than the precast concrete foundation provided with the fixing plate closer to the connection from this position. The width can be reduced, so that the precast concrete foundation can be manufactured at low cost only by reducing the width.

[0012] In the case of a precast concrete foundation installed at a location crossing a T-shape or + -shape, it is necessary to increase the anchoring strength of anchor bars to adjacent precast concrete foundations attached on both sides. Therefore, in order to connect to the adjacent precast concrete foundation, both ends of the anchor bar are exposed on both sides of the foundation body, and this part is used as a connection part to be joined to the adjacent precast concrete foundation, and fixed at the center of the anchor bar. A plate may be provided. Further, in the above case, if two fixing plates are provided so as to sandwich substantially the center of the anchor streaks, the anchoring stabilization strength of the anchor streaks is determined by the distant fixing plate. A larger anchoring strength of anchor bars can be obtained than a precast concrete foundation with a fixing plate attached to the base.

In other words, if the foundation has the same fixing strength, the width of a precast concrete foundation having two fixing plates sandwiching substantially the center can be made smaller than that having one fixing plate at the center. However, only by reducing the width, a precast concrete foundation can be manufactured at low cost. Further, if the width of the base body near the place where the anchor bar is embedded in the width direction is wider than the width of the other base bodies, the embedding depth of the anchor bar can be increased, so that the anchor bar can be fixed. A precast concrete foundation with high yield strength is obtained. In other words, the width of the precast concrete foundation is not determined only by the anchoring strength of the anchor bars, but also the bearing capacity for the building built on the foundation,
It is also determined by bending strength, shearing force and the like. When the width determined by other factors is smaller than the width determined by the anchoring strength of the anchor bar, the width of the precast concrete foundation is increased only in the portion near the anchor bar, and the width of the other portions is reduced. Just by reducing the width, the precast concrete foundation can be manufactured at low cost.

[0014]

Next, embodiments of the present invention will be described. Figures 1-3
FIG. 1 shows an embodiment of the precast concrete foundation of the present invention. FIG. 1 is a perspective view of a foundation installed at a portion crossing an L-shape, and FIG. 2 is a joint state of anchor bars of the foundation shown in FIG. FIGS. 3A and 3B are diagrams for use in calculating anchoring strength of anchor muscles. FIG. 3A is a layout diagram of anchor muscles viewed from the end face direction, and FIG. 3B is a layout diagram of anchor muscles viewed from the side. is there. 4 and 5 show another embodiment of the precast concrete foundation of the present invention, and FIG. 4 is a perspective view of a foundation installed at a portion crossing in a T shape.
FIG. 5 is an explanatory diagram showing a joint state of the anchor bar of the foundation shown in FIG.

FIGS. 6 and 7 show another embodiment of the precast concrete foundation of the present invention. FIG. 6 is a perspective view of a foundation installed at a crossing portion of a T-shape, and FIG. It is explanatory drawing which shows the joining state of the anchor muscle of the foundation shown. FIGS. 8A and 8B show still another embodiment of the precast concrete foundation of the present invention, wherein FIG. 8A is a plan view of the foundation installed at the portion where it crosses in an L shape, and FIG. 8B is a side view. FIG. 9 shows still another embodiment of the precast concrete foundation of the present invention. (A) is a plan view of a foundation installed at a portion where it crosses in a T shape, and (B) is a side view.

First, the embodiment shown in FIGS. In FIGS. 1 to 3, A is a precast concrete foundation for a wife foundation, and B is a precast concrete foundation for a girder foundation. The precast concrete foundation A for the wife foundation and the precast concrete foundation B for the girder foundation are installed so as to intersect in an L-shape as shown in FIG. The precast concrete foundation A for the wife foundation comprises a foundation body 1 and anchor bars 4, and the foundation body 1 comprises a rising part 2 and a base part 3. A main bar and a rib are provided in the rising portion 2 and the base 3, respectively, but they are omitted. The precast concrete foundation B for the girder foundation is installed after the precast concrete foundation A for the wife foundation is installed, and is then installed between the foundations A. The precast concrete foundation B comprises a foundation main body 5 and anchor bars 6, The main and ribs are also provided in the main body 5 but are omitted.

Precast concrete foundation A for wife foundation
Is a rod-like body having a diameter of 16 mm, and includes an embedded portion 41 embedded in the width direction and a connecting portion 42 in which the embedded portion 41 is exposed on the side surface of the base body 1. or,
A fixing plate 43 is provided in the embedding portion 41. Connection part 4
2 is threaded. And this connection part 4
The vicinity of the precast concrete foundation 2 is notched 45, and the connecting portion 42 is exposed. Then, after joining the precast concrete foundation A for the wife foundation and the precast concrete foundation B for the girder foundation, the notch 45 is filled with cement mortar.

As shown in FIG. 3, the length (r1) of the embedded portion 41 is 160 mm, and the thickness (r2) of the fixing plate is 3 mm.
The length from the fixing plate 43 to the side surface on the opposite side (fogging thickness r3) is 40 mm. The fixing plate 43 has a radius (r
6) is a disk-shaped steel plate having a thickness of 55 mm and a thickness (r2) of 30 mm. The width (r1 + r2 + r3) of the rising part 2 is 230
mm, and the embedding position of the anchor bar 4 is 95 m from the upper surface.
m (r4), 172 mm (r5) from the end face. When the anchoring strength of this anchor is determined,
As described above, the effective vertical projection area (A _c ) of the anchor streaks is (the area surrounded by the line where the divergent conical surface inclined 45 ° from the periphery of the fixing plate 43 intersects the side surface of the base body 1,
That is, the radius R (215 m) centered on O in FIG.
m) is 1049 cm ² , and the concrete design strength (F _c ) is 180 k.
g / cm ² , the fixing strength (P) is P = 0.6
From ^{_{× F c 1/2 × A c,}} 7602kg , and the fixing strength of the anchor muscle it can be seen that sufficiently large.

Precast concrete foundation B for girder foundation
Anchor bar 6 is a rod-shaped body having a diameter of 13 mm, two embedding portions 61 embedded in a length of 520 mm in parallel in the longitudinal direction, and this embedding portion 61 is exposed on the end face of the base body 5. And a connecting portion 62. The connecting portion 62 includes a U-shaped metal piece 63 and a nut 64 rotatably provided at the center of the web of the U-shaped metal piece 63, and is embedded in flanges on both sides of the U-shaped metal piece. Two rods of the insertion portion 61 are welded respectively. The nut 64 has a size that allows the screw thread of the connecting portion 42 of the precast concrete foundation A for the wife foundation to be screwed. In addition, this nut 64
Is provided projecting from the end face of the precast concrete foundation B for the girder foundation, and the U-shaped metal piece 63 is embedded in the foundation.

Next, a method of installing the precast concrete foundation will be described. First, after the precast concrete foundation A for the wife foundation is installed, the precast concrete foundation B for the girder foundation is inserted and connected between the precast concrete foundations A for the wife foundation. The connection method between the precast concrete foundation A for the girder foundation and the precast concrete foundation B for the girder foundation will be described in further detail. Then, the connecting portion 42 in which the thread of the precast concrete foundation A for the wife foundation is drilled is inserted into the nut 64 of the precast concrete foundation B for the girder foundation,
By rotating the nut 64 and screwing the connecting portion 42 into the nut 64, the precast concrete foundation A for the wife foundation
And the precast concrete foundation B for the girder foundation.

Thereafter, cement mortar is poured into the cutout 45 of the precast concrete foundation A for the wife foundation to fill it. By doing so, the foundation of the portion crossing the L-shape is completed. Next, the embodiment shown in FIGS. In the embodiment shown in FIGS. 4 and 5, a precast concrete foundation Ba for a girder foundation is attached to both sides of a precast concrete foundation Aa for a wive foundation, which is a foundation installed at a portion crossing in a T-shape. And precast concrete foundation A for wife foundation
The width of the rising part 2a of a is 410 mm. Further, a bar-shaped anchor bar 4a is embedded in the width direction of the rising portion 2a to form an embedding portion 41a, and both ends of the anchor bar 4a appear on both side surfaces of the precast concrete foundation Aa to form a connecting portion 42a. That is, the anchor bar 4a includes an embedding portion 41a and a connecting portion 42a in which both ends of the anchor bar 4a are exposed on the side surface of the precast concrete foundation.

The structure of the embedded portion 41a and the connecting portion 42a is shown in FIG.
It has the same structure as the embodiments shown in FIGS. This embedded part 4
A disc-shaped fixing plate 43a having a radius of 55 mm and a thickness of 30 mm is provided at the center of 1a. Therefore, the distance from the fixing plate 43a to the side surface of the rising portion 2a is 190 mm. When the anchoring strength of the anchor bar 4a of the precast concrete foundation Aa for wives is calculated in the same manner as in the embodiment shown in FIGS. Is sufficient. The precast concrete foundation Ba for the girder foundation has the same structure as the embodiment shown in FIGS. The construction method of this foundation is the same as the embodiment shown in FIGS. 1 and 2 except that the precast concrete foundation Ba for the girder foundation is attached to both side surfaces of the precast concrete foundation Aa for the wife foundation.

Next, an embodiment shown in FIGS. 6 and 7 will be described. In the embodiment shown in FIGS. 6 and 7, similarly to the precast concrete foundation shown in FIGS. 4 and 5, the foundation is installed at a portion where it crosses in a T-shape. The precast concrete foundation Bb for the girder foundation is attached. And
Rise of precast concrete foundation Ab for wife foundation 2
The width of b is 260 mm. Also, a rod-shaped anchor bar 4b is embedded in the width direction of the rising portion 2b, and the embedded portion 41b is embedded.
Both ends of the anchor bar 4b are exposed on both side surfaces of the precast concrete foundation Ab to form a connection portion 42b. That is, the anchor streak 4b is
Both ends of the anchor bar 4b are composed of a connecting portion 42b exposed on the side surface of the precast concrete foundation. The structures of the buried portion 41b and the connecting portion 42b are the same as those of the embodiment shown in FIGS.

The center of the embedded portion 41b is 120 m
Two disc-shaped fixing plates 43b having a radius of 55 mm and a thickness of 30 mm are provided at intervals of m. Therefore, the distance from the side surface of the rising portion 2b to the farther fixing plate 43b is 1
90 mm. The anchoring strength of the anchor bar 4b of the precast concrete foundation Ab for the wife base is 10023 kg, which is the same as the embodiment shown in FIGS. Therefore, it is understood that the anchoring strength of the anchor bar 4b of the precast concrete foundation Ab for the wife foundation is sufficient. And it turns out that 260 mm of width | variety of the rising part 2b is smaller than 410 mm of the Example shown in FIGS. In other words, as the width is small, the precast concrete foundation Ab for the wife foundation of this embodiment can be manufactured at a lower cost than those shown in FIGS.

Next, the embodiment shown in FIG. 8 will be described. When comparing the embodiment shown in FIG. 8 with the embodiment shown in FIGS. 1 to 3, in the embodiment shown in FIG. 8, the width of the general portion of the precast concrete foundation Ac for the wife foundation is 160 mm,
The width of the part to be joined with the precast concrete foundation Bc for the girder foundation, that is, the width in the vicinity of the place where the anchor bar 4c is embedded is 230 mm, which is the same as the width of the precast concrete foundation for the wife foundation shown in FIGS. . or,
The structure of the fixing plate 43c, the anchor bar 4c, and the mounting position of the fixing plate 43c are the same as those in the embodiment shown in FIGS.
The anchoring strength of the anchor bar 4c is the same as that of the embodiment shown in FIGS. Moreover, in this embodiment, the width 160 mm of the general portion of the precast concrete foundation Ac for the wife foundation is smaller than the width 230 mm of the embodiment shown in FIGS.

Next, an embodiment shown in FIG. 9 will be described. When comparing the embodiment shown in FIG. 9 with the embodiment shown in FIGS. 4 and 5, in the embodiment shown in FIG. 9, the width of the general portion of the precast concrete foundation Ad for the wife foundation is 270 mm,
The width of the part to be joined with the precast concrete foundation Bd for the girder foundation, that is, the width near the place where the anchor bar 4d is embedded is the same as the width of the precast concrete foundation for the wife foundation shown in FIGS. . or,
The structure of the fixing plate 43d and the anchor bar 4d and the mounting position of the fixing plate 43d are the same as those in the embodiment shown in FIGS. Therefore, the anchoring strength of the anchor bar 4d is the same as that of the embodiment shown in FIGS. In addition, in this embodiment, the width of the general portion of the precast concrete foundation Ad for the wife foundation is 270 m.
Since m is smaller than the width 410 mm of the embodiment shown in FIGS. 4 and 5, it can be manufactured at a lower cost.

[0027]

According to the precast concrete foundation of the present invention, a fixing plate is provided at the embedded portion of the anchor bar so that the plate surface of the fixing plate is substantially perpendicular to the bar-shaped anchor bar. The proof stress can make the embedding depth smaller than when there is no conventional fixing plate. Therefore, when the precast concrete foundation is installed on the foundation where the T-shaped, + -shaped, or L-shaped crosses, conventionally, the embedding depth of the anchor bar cannot be sufficiently obtained in the width direction of the precast concrete foundation. Thus, it was difficult to join the end face of another precast concrete foundation to the side face of the precast concrete foundation and firmly attach this end face. However, in the present invention, it has been made possible by providing a fixing plate.

When anchor bars are embedded in the width direction of the base body from the connection portion and a fixing plate is provided at a place beyond the center of the base body, the anchoring strength of the anchor bars is increased by the precast concrete in which the fixing plate is provided at the center portion. Be larger than the base.
Therefore, if the precast concrete foundation has the anchoring strength of the same anchor bar, if the fixing plate is provided beyond the center of the foundation body, the width will be smaller than the precast concrete foundation where the fixing plate is provided near the connection part. And can be manufactured at low cost. When anchor bars are embedded in the base body in the width direction, both ends are exposed on both sides of the base body to serve as connecting parts, and fixing plates are provided at the center of the anchor bars, and another side is provided on both sides of the precast concrete. Precast concrete foundation can be connected.

At this time, if two fixing plates are provided substantially at the center, the fixing strength is higher than that of a precast concrete foundation having one fixing plate at the center. Therefore, in the case of a precast concrete foundation having the same anchoring strength of the anchor bar, if two fixing plates are provided with the fixing plate being sandwiched substantially at the center, the width can be made smaller than that of the precast concrete foundation in which the fixing plate is provided at the center, and the cost is low Can be manufactured.
Also, since the anchoring strength of the anchor streaks is greater as the length of the anchor streaks between the anchoring plate and the side surface of the base body is longer, the width of the base body near the place where the anchor streaks are embedded in the width direction is increased. When the width is larger than the width of the base body, the fixing strength becomes large. Therefore, if it is a precast concrete foundation having the anchor strength of the same anchor bar, the width of the foundation body near the place where the anchor bar is embedded in the width direction,
If the width of the other main body is larger than that of the other main body, it can be manufactured at a lower cost because the width of the other main body is smaller. Thus, the present invention is extremely valuable because it has various effects.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a precast concrete foundation of the present invention, and is a perspective view of a foundation installed at a portion crossing in an L-shape.

FIG. 2 is an explanatory view showing a joint state of a base anchor bar shown in FIG. 1;

FIGS. 3A and 3B are diagrams for use in calculating anchoring strength of anchor bars. FIG. 3A is a layout diagram of anchor bars viewed from the end face direction, and FIG. 3B is a layout diagram of anchor bars viewed from the side. It is.

FIG. 4 shows another embodiment of the precast concrete foundation according to the present invention, and is a perspective view of the foundation installed at a portion crossing in a T-shape.

FIG. 5 is an explanatory view showing a joint state of the anchor muscle of the foundation shown in FIG. 4;

FIG. 6 shows another embodiment of the precast concrete foundation of the present invention, and is a perspective view of the foundation installed at a place where the foundation crosses in a T-shape.

FIG. 7 is an explanatory view showing a joint state of the anchor muscle of the foundation shown in FIG. 6;

FIG. 8 shows still another embodiment of the precast concrete foundation of the present invention, in which (a) is a plan view of the foundation installed at a portion crossing an L-shape,
(B) is a side view.

FIG. 9 shows yet another embodiment of the precast concrete foundation of the present invention, in which (a) is a plan view of a foundation installed at a portion crossing a T-shape,
(B) is a side view.

[Explanation of symbols]

A, Aa, Ab, Ac, Ad Precast concrete foundation for wife foundation 1 Foundation body 2, 2a, 2b Rise 3 Base 4, 4, 4a, 4b, 4c, 4d Anchor bars 41, 41a, 41b Embeds 42, 42a, 42b Connection part 43, 43c, 43d Fixing plate 45 Notch B, Ba, Bb, Bc, Bd Precast concrete foundation for girder foundation 5 Base body 6 Anchor bar 61 Embedded part 62 Connection part

Claims (5)

(57) [Claims] 1. A precast concrete foundation comprising a base body made of a long body and a rod-shaped anchor bar mostly embedded in the base body, wherein the anchor bar extends in the width direction in the base body. It consists of a buried embedded part and a connecting part in which the anchor streaks are exposed on the side of the base body. So that
Precast concrete foundation characterized by being provided. 2. The precast concrete foundation according to claim 1, wherein an anchor streak is buried in the width direction of the foundation body from the connection part, and a fixing plate is provided at a position beyond the center of the foundation body. 3. An embedding portion in which an anchor bar is embedded in a width direction in a base body, and a connecting portion in which both ends of the anchor bar are exposed on both side surfaces of the base body. The precast concrete foundation according to claim 1, wherein a fixing plate is provided at a central portion. 4. An embedding portion in which an anchor bar is embedded in a width direction in a base main body, and connecting portions in which both ends of the anchor bar are exposed on both side surfaces of the base main body. 2. The precast concrete foundation according to claim 1, wherein two fixing plates are provided substantially at the center. 5. The precast concrete foundation according to claim 1, wherein the width of the foundation body near the place where the anchor bars are embedded in the width direction is wider than the width of the other foundation bodies.