JP2967575B2 - Building foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation for a building, and more particularly to a foundation for a building made of precast concrete.

[0002]

2. Description of the Related Art As a foundation construction technique for making a concrete building foundation (hereinafter referred to as a foundation in the present specification) comprising a footing portion and a rising portion, a rising portion is made of a precast concrete rising member. It is known that a footing portion is formed by casting concrete on site, and a lower portion of a rising member is embedded in the footing portion to integrate the rising member with the footing portion.

[0003]

However, according to the above-described foundation construction technique, not only must the formwork for the footing be formed before the concrete is cast, but also the formwork is removed after the concrete is cast. Therefore, there is a problem that workability is poor.

In order to prevent the rising member from falling out of the footing portion, a retaining reinforcing bar buried in the footing portion is implanted in a lower part of the rising member so as to extend substantially horizontally. There is a problem that not only does the retaining bar hinder the handling of the member, but also the bulky transport efficiency is poor when the rising member is transported by a truck or the like.

The present invention has been made to solve the above problems, and has as its object to provide a precast concrete foundation which is easy to handle with good workability and transportation efficiency.

[0006]

According to a first aspect of the present invention, there is provided:
A precast concrete footing member provided with a concave storage portion, and a footcast member placed in the concave storage portion of the footing member, and a lower portion integrated with the footing member by cast-in-place concrete poured into the concave storage portion. A rising member made of precast concrete to be formed, and a retaining member and a retaining step buried under the rising member in the cast-in-place concrete to prevent the rising member from falling out of the concave storage portion. Part is provided so as to protrude outward, and the retaining step is integrally provided with the rising member and is provided continuously in parallel with the longitudinal direction of the footing member. It is provided so as to cover the entire upper surface of the step portion.

According to a second aspect of the present invention, in the first aspect, the retaining member can be deformed into a state of being bent along the rising member and a state of extending substantially horizontally from the rising member. It is constituted by a member that can be bent and extended.

[0008]

According to the first aspect of the present invention, the footing member of the foundation has a recessed storage portion into which a cast-in-place concrete for burying a lower portion of the rising member and integrating the rising member with the footing member is poured. Because it is provided,
There is no need to make a mold when casting concrete in the concave storage part to make a footing part of the foundation.

The retaining step is formed integrally with the lower part of the rising member, and the entire upper surface of the retaining step is covered by cast-in-place concrete poured into the concave storage portion. The member is firmly fixed to the footing member, and the upward rising member is reliably prevented from coming off. Furthermore, the retaining step portion is located below the rising member,
Since it is provided continuously in parallel with the longitudinal direction of the footing member, the contact area between the cast-in-place concrete poured into the concave storage portion and the upper surface of the retaining step is increased, and a large frictional force is generated. Therefore, the rising member is prevented from shifting laterally, and the integration of the rising member and the footing member becomes strong.

According to a second aspect of the present invention, the retaining member is formed of a member that can be bent and extended so as to be deformed into a state of being bent along the rising member and a state of extending substantially horizontally from the rising member. Except when the rising member is installed at a predetermined position on site, if the retaining member is bent along the rising member, the retaining member hardly protrudes from the rising member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case of a cloth foundation as an example of the foundation according to the present invention will be described below with reference to FIGS. Among them, FIG. 1 is a partially cutaway perspective view of the foundation, FIG. 2 is a longitudinal side view of a footing member of the foundation, FIG. 3 is a longitudinal side view of a rising member of the foundation, and FIG. 4 is a front view illustrating a joint method of the foundation. FIG.

As shown in FIG. 1, the foundation 1 has a rising member 15 made of precast concrete placed in a footing member 11 made of precast concrete, and a lower portion 15a of the rising member 15 is cast by cast-in-place concrete 19. It is configured integrally with the footing member 11.

As shown in FIG. 2, the footing member 11 includes a bottom plate portion 111 made of concrete and a bottom plate portion 111 made of concrete.
Are formed integrally with both side plate portions 115, 115 raised from both end portions of the base plate. For example, reinforcing steel bars 119, 119,... The space surrounded by the bottom plate portion 111 and both side plate portions 115, 115 is a concave storage portion 113 that can store the cast-in-place concrete 19.

As shown in FIG. 3, the rising members 15 are, for example, reinforcing reinforcing bars 159, 15 assembled vertically and horizontally.
9 and the like are buried in a concrete wall body. At the lower part 15a, retaining steel bars 151 penetrating the rising member 15 and extending from both sides 15b of the rising member 15 to both outsides are attached. I have. This retaining bar 151
Is a retaining member for preventing the rising member 15 from falling out of the concave storage portion 113, and is provided at a height that can be buried in the cast-in-place concrete 19. That is, when the rising member 15 is placed in the concave storage portion 113 of the footing member 11, the retaining bar 151 is accommodated in the concave storage portion 113 (see FIG. 1). As shown by arrows in FIG. 3, the retaining bar 151 is bent along the rising member 15 at the base end 151 a protruding from the rising member 15 and when the rising member 15 is bent.
It has such a degree of plasticity that it can be deformed by human power to a state that it extends substantially horizontally from the object.

At the lower portion 15a of the rising member 15, a retaining step portion 155 is provided integrally with the rising member 15 and continuously projecting outward in parallel with the longitudinal direction of the footing member 11. I have. This retaining step 155
Is for preventing the rising member 15 from falling out of the concave storage portion 113, and is buried in the cast-in-place concrete 19. That is, when the rising member 15 is placed in the concave storage portion 113 of the footing member 11, the upper end surface 155a of the retaining step portion 155 is positioned lower than the upper end surface 115a of the side plate portion 115 of the footing member 11. (See FIG. 1).

The footing member 1 constructed as described above
The base 1 is made up of the base 1 and the rising member 15 as follows. First, as shown in FIG. 1, the footing member 11 is installed at a predetermined position on the site. The rising member 15 is stored in the concave storage portion 113 of the footing member 11, and the retaining bar 151 of the rising member 15 is extended so as to be substantially horizontal.
At this time, if necessary, the leveling of the rising member 15 is performed with a mortar for level adjustment. The cast-in-place concrete 19 is poured into the concave storage portion 113. In this way, the foundation 1 is made. Next, as shown in FIG. 4, meshes 5 and the like are applied to both sides of the joint A (space) between the individual foundations 1, 1, and the corresponding plates 8, 8,. Bolts 4 are attached to nuts 3, 3,... Embedded near the ends of both side plates 115, 115 and the ends of both sides 15b, 15b of rising member 15, respectively.
4, ... are screwed together and fastened. ). At this time, although not shown in FIG. 4, reinforcing bars 159, 159,... Projecting from the end 15 c of the rising member 15 of the foundation 1.
(See FIG. 1) and the reinforcing bars 159, 159,... Which similarly project from the opposing foundation 1 are welded and connected to each other. Concrete is poured into the joint portion A, and the individual foundations 1 and 1 are connected. Thus, the construction of the foundation is completed. When the concrete is poured into the joint part A, the concrete 19 cast in place may be poured together. In this case, the labor of placing the concrete is one time, and the workability is further improved.

According to the above embodiment, since the footing member 11 of the foundation 1 is provided with the concave storage portion 113 into which the cast-in-place concrete 19 is poured, concrete is poured into the concave storage portion 113 to form the foundation. There is no need to make a mold when making the footing part. Therefore, the labor for making and removing the formwork can be saved, and the workability of the foundation construction work can be remarkably improved.

Further, since the retaining bar 151 can be bent and extended so as to be deformed into a state of being bent along the rising member 15 and a state of extending substantially horizontally from the rising member 15, the retaining bar 151 is raised. If the rising member 15 is bent along the member 15, the retaining bar 151 does not hinder the handling when the rising member 15 is handled, and the transporting efficiency is improved without being bulky during the transportation.

In the above-described embodiment, the case where the retaining bar 151 is used as the retaining member has been described. However, the present invention is not limited to this, and the lower portion 15a of the rising member 15 is not limited thereto.
For example, an iron plate may be used as long as it is provided so as to protrude in the horizontal direction and can be embedded in the concrete 19 cast in place.

In the above embodiment, the retaining bar 1
Although 51 is assumed to have plasticity enough to be deformable by human power and to be able to be bent and stretched, it goes without saying that it is not necessary to be able to bend and stretch.

Further, in the above embodiment, the reinforcing bars 159, 159,... Protrude from the end 15c of the rising member 15, but they do not necessarily have to protrude.

Further, in the above embodiment, the case of the cloth foundation has been described, but the invention can be applied to an independent foundation. In this case, there is no need to connect the foundations with each other, so there is no need to project the reinforcing bars 159, 159,.
The nut 3 is also unnecessary.

[0023]

According to the first aspect of the present invention, the footing member of the foundation has a recessed housing into which a lower part of the rising member is buried and cast-in-place concrete for integrating the rising member with the footing member is poured. Since the part is provided, there is no need to form a mold when casting concrete in the concave storage part to form the footing part of the foundation. Therefore,
The work of making and removing the formwork can be omitted, and the workability of the foundation construction work is significantly improved.

The retaining step is formed integrally with the lower part of the rising member, and the entire upper surface of the retaining step is covered with cast-in-place concrete poured into the concave storage portion. The member is firmly fixed to the footing member, and the upward rising member is reliably prevented from coming off. Furthermore, the retaining step portion is located below the rising member,
Since it is provided continuously in parallel with the longitudinal direction of the footing member, the contact area between the cast-in-place concrete poured into the concave storage portion and the upper surface of the retaining step is increased, and a large frictional force is generated. Therefore, the rising member is prevented from shifting laterally, and the integration of the rising member and the footing member becomes strong. Thus, a solid precast concrete foundation can be provided as a whole.

The foundation according to the second aspect is constituted by a member which can be bent and extended so that the retaining member can be deformed into a state of being bent along the rising member and a state of extending substantially horizontally from the rising member. Except when the rising member is installed at a predetermined position on site, if the retaining member is bent along the rising member, the retaining member hardly protrudes from the rising member. Therefore, when the rising member is handled, the retaining member does not become an obstacle and is easy to handle, and when transported, the transporting efficiency is improved without being bulky.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a foundation in the present embodiment.

FIG. 2 is a longitudinal sectional side view of a footing member of a foundation in the embodiment.

FIG. 3 is a vertical sectional side view of a rising member of a foundation in the embodiment.

FIG. 4 is a front view for explaining a foundation joint method in the present embodiment.

[Explanation of symbols]

 Reference Signs List 1 foundation 11 footing member 15 rising member 15a lower part 19 cast-in-place concrete 113 concave storage part 151 retaining bar (retaining member)

Claims (2)

(57) [Claims] 1. A footing member made of precast concrete provided with a concave storage portion, and a cast-in-place concrete placed in the concave storage portion of the footing member and a lower portion cast into the concave storage portion. The footing member is constituted by a precast concrete rising member integrated with the rising member. The rising member is buried in the cast-in-place concrete at a lower portion of the rising member to prevent the rising member from falling out of the concave storage portion. The retaining member and the retaining step are provided in a state of protruding outward, and the retaining step is provided integrally with the rising member, continuously in parallel with the longitudinal direction of the footing member, and The foundation of a building characterized in that concrete is cast so as to cover the entire upper surface of the retaining step. 2. The method according to claim 1, wherein the retaining member is formed of a member that can be bent and extended so as to be deformed into a state of being bent along the rising member and a state of extending substantially horizontally from the rising member. The foundation of a building according to claim 1.