JP2517735Y2 - Precast concrete foundation - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete foundation manufactured in advance in a factory or the like.

[0002]

2. Description of the Related Art Conventionally, when constructing a foundation, the following construction procedure has been generally adopted. That is,
First, a root cutting hole is dug at the site, and an aggregate such as split stone is laid on the bottom of the hole, and then waste concrete is formed on it. After the discarded concrete is hardened, a mold having a predetermined shape is arranged on the concrete, and the concrete is poured in a state in which necessary reinforcing bars and the like are provided inside the mold. Then, after the concrete is cured for a predetermined period, the formwork is disassembled to obtain a desired foundation.

FIG. 2 shows an example of a cast-in-place concrete foundation for a wooden house. Here, only the part arranged above the discarded concrete is shown. In the figure, reference numeral 10 is a main reinforcing bar, 11 is a stirrup bar arranged so as to intersect with the main reinforcing bar 10, and these reinforcing bars are embedded in the concrete 12 in order to increase the shear resistance of the foundation itself.

Numeral 13 is an anchor bolt formed in a substantially L shape or a J shape. The anchor bolt 13 is used when the wooden base 15 is attached to the upper part of the foundation via the base wheel 14, and the wooden base 15 is provided with a hole 15a for bolt penetration in advance, and the anchor bolt 13 is inserted through the hole 15a. The nut member 16 from above
The wooden base 15 is screwed and tightened.
Is firmly fixed to the foundation. The anchor bolt 13 and the stirrup bar 11 are fixed to the main bar 10 by a fixing means such as a wire.

[0005]

In the construction method described above, when the anchor bolt 13 is provided on the foundation, the anchor bolt 13 must be arranged at the same time when the main bar 10 or the stirrup bar 11 is assembled. There is a drawback that the work for positioning the anchor bolt 13, the work for arranging, the work for transportation, and the work are troublesome.

The present invention has been made in view of the above circumstances, and can eliminate the work of positioning the anchor bolt and the work of arranging the bar during the bar arrangement, facilitating the handling as a precast member and the anchor. The purpose is to provide a precast concrete foundation with increased flexibility in mounting bolts.

[0007]

In the precast concrete foundation of the present invention, a recess is formed in the upper surface, and the upper end of the stirrup is exposed in the recess so as not to project upward from the recess. The above problem was solved by connecting the upper anchor bolt to the upper end of the streak.

[0008]

[Function] Precast concrete foundations manufactured in advance in factories, etc. were cast on site for the reasons that the mixing ratio of cement can be increased, curing can be performed in an ideal form, and certain quality can be easily secured. It has the property of increasing the concrete strength compared to concrete foundations.

The basis of the present invention is to effectively utilize the property of precast concrete that such high strength can be obtained. Specifically, the extra proof stress of the foundation is effectively utilized by using the stirrups as anchor bolts.

According to this structure, it is not necessary to dispose a dedicated anchor bolt at the time of arranging the main bar or the stirrup, and the arranging bar distribution work is facilitated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The precast concrete foundation of the present invention will be described below with reference to FIG. The same components as those described in the conventional example are designated by the same reference numerals to simplify the description.

FIG. 1 shows a precast concrete foundation, which is common to the conventional example in that a main bar 10 and a stirrup bar 11 arranged so as to intersect the main bar 10 are embedded in concrete 12.

In the precast concrete foundation of the present invention, an inverted frustoconical recess Z is formed on the upper surface of the concrete 12 so that the upper end of the stirrup bar 11 does not protrude upward from the recess Z. It is characterized in that the upper anchor bolt 1 is exposed and the upper anchor bolt 1 is connected to a necessary portion of the upper end of the rib 11. That is, the stirrup bar 11 in this foundation has not only the original function of the stirrup bar to increase the shear strength but also a function as part of the anchor streak (bolt). Therefore, the anchor bolt of this foundation is constituted by the stirrup bar 11 and the upper anchor bolt 1 connected thereto.

A bolt portion 2 is provided at the upper end of the stirrup bar 11. The bolt 2 is exposed vertically upward in the recess Z, but the tip of the bolt 12 is made of concrete 12.
The length is adjusted so that it does not project upward from the upper surface of the.

On the other hand, a nut member 3 is attached to the lower end of the upper anchor bolt 1, and the nut member 3 is screwed onto the bolt portion 2 of the stirrup bar 11, whereby the upper anchor bolt 1 is attached to the stirrup bar 11. Be connected.

The spacing L between the ribs 11 is set according to the pitch required for the anchor bolt.
Compared with the conventional example, the conventional one is, for example, 300 m.
In contrast to the m pitch, the basic of the present invention is 250 mm
The pitch.

It is not always necessary to connect all of the upper anchor bolts 1 to the exposed upper ends of the stirrups 11, and it is sufficient to connect only the required positions. In this case, a filling material such as mortar or the like is embedded in the concave portion Z at a portion which is not connected.

However, according to the foundation of the above construction, since it is used as the stirrup bar 11 anchor bolt, it is necessary to dispose a dedicated anchor bolt at the time of arranging the main bar 10 or the stirrup bar 11 or the like. There is no. Therefore, the troublesome work such as positioning work of the anchor bolts 13 and rebar work is unnecessary, and the rebar work is facilitated.

If the precast concrete foundation produced in a factory is transported to the site and installed, and then the upper anchor bolt 1 is connected to the upper end of the stirrup bar 11, the upper portion of the precast concrete foundation can be transported. There is an advantage that the anchor bolt 1 does not protrude, it can be easily transported, and damage to the anchor bolt 1 is avoided.

In addition, if a large number of stirrups 11 are embedded at predetermined intervals in advance, the upper anchor bolts 1 can be attached only to the necessary places according to the building plan, which allows the precast concrete foundation. The degree of adaptability is increased, and precast members can be made and put together. It should be noted that mortar or the like may be embedded in the extra portion as described above.

The structure of the precast concrete foundation of the present invention is not limited to the above-mentioned embodiment, and the concrete constitutional requirements such as the shape, material, size and construction procedure of each member can be appropriately changed upon execution. is there. For example, in the above-mentioned embodiment, a mere bar-shaped stirrup bar is used, but the present invention is not limited to this, and the present invention is applicable to a loop-shaped stirrup bar.

[0022]

As described above, in the precast concrete foundation of the present invention, the upper ends of the stirrups are exposed in the recesses formed on the upper surface so as not to project upward from the recesses. Since it is configured to connect the upper anchor bolt to the, it is possible to effectively use the property of precast concrete that can obtain high strength, and it is not necessary to arrange reinforcement such as main bars and stirrups at the construction site, and The dispensing operation is also facilitated by simply connecting the upper anchor bolts to the exposed upper ends of the stirrups. In addition, since the upper end of the stirrup does not project upward from the recess, the precast concrete foundation can be easily transported, the anchor bolts are not damaged during transportation, and the locations required depending on the building plan. Since it is only necessary to attach the upper anchor bolt to the above, it is possible to obtain an excellent effect such as an increase in the degree of freedom of the precast member.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a precast concrete foundation of the present invention.

FIG. 2 is a side sectional view showing a conventional concrete foundation.

[Explanation of symbols]

 1 Anchor bolt 2 Bolt part 3 Nut part 10 Main bar 11 Rib bar 12 Concrete

Claims (1)

(57) [Scope of utility model registration request] 1. A precast concrete foundation in which main bars and ribs arranged so as to intersect with the main bars are embedded, and a recess is formed on the upper surface of the precast concrete foundation.
The upper end of the stirrup in this recess from the recess
Exposed so that it does not project upward , and at the upper end of the stirrup
Precast concrete foundation made by connecting upper anchor bolts .