JPH09189128A - Fixing structure of form for precast reinforced concrete foundation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a form for placing concrete at the periphery of cast-in- place concrete part of adjacent precast parts. SOLUTION: In this fixing structure for a form, a cast-in-place concrete part 23 is provided at the end 22 of the precast part 21 of a precast reinforced concrete foundation 20. The form 28 for placing concrete in the cast-in-place concrete part of the adjacent precast parts is fixed at the periphery of the cast-in-place concrete part. The cast-in-place concrete part is transferred to the end 22 of the precast part 21 of the precast reinforced concrete foundation 20 and the bolts 29 for a fixing member 31 of the form are erected and the form is fixed to the end of the precast part with fastening nuts 30 for the fixing member of the form.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a form fixing structure for a precast reinforced concrete foundation.

[0002]

2. Description of the Related Art Conventionally, a construction period for building a foundation of a building is as follows.
A precast reinforced concrete foundation as disclosed in Japanese Utility Model Publication No. 4-47249 has been proposed in order to reduce the length of the cast-in-place reinforced concrete foundation.

When arranging the precast portions of such precast reinforced concrete foundations on site and joining adjacent precast portions to form an integrated precast reinforced concrete foundation, as shown in FIG. The ends of the adjacent precast sections 2 are butted, the main reinforcing bars 5 of the notched on-site concrete placing section 4 are connected to the ends, and concrete is cast on the on-site concrete placing section 4. To join adjacent precast parts. At the time of this concrete placement, the formwork 6 is fixed around the concrete placement part 4 on site.

In general, the mold 6 is fixed by using a mold fixing metal 7 having a U-shape in a side view as shown in FIGS.

[0005] In this form fixing metal fitting 7, a claw 9 (FIG. 6) for locking the form 6 is installed on the support 8, and
A fastening bolt 11 that moves forward and backward toward the support portion 8 is screwed. The precast portion 2 of the precast reinforced concrete foundation 1 is sandwiched between the support portion 8 and the base portion 10 of the form fixing metal fitting 7, and the form 6 is
And the formwork 6 is fixed to the precast portion 2 by fastening the fastening bolts 11.

[0006]

However, since the rising height of the precast portion 2 of the precast reinforced concrete foundation 1 is set high in a cold region, the length L of the support portion 8 of the formwork fixing metal 7 is also long. Become. For this reason, bending deformation tends to occur in the support portion 8 of the formwork fixing bracket 7,
Precast part 2 of precast reinforced concrete 1
In addition, even if the formwork 6 is fixed using the formwork fixing bracket 7, there is a possibility that when the concrete is cast in place, the lateral pressure cannot be endured.

The object of the present invention has been made in consideration of the above circumstances, and a precast capable of firmly fixing a formwork for concrete pouring around the on-site concrete pouring parts of adjacent precast parts. The purpose is to provide a formwork fixing structure for a reinforced concrete foundation.

[0008]

According to a first aspect of the present invention, there is provided an on-site concrete pouring portion at an end of a precast portion of a precast reinforced concrete foundation, and the on-site concrete pouring of the precast portions adjacent to each other on site. Formwork used to place concrete in the section, in the formwork fixing structure of the precast reinforced concrete foundation that is fixed around the site concrete placement section, at the end of the precast section of the precast reinforced concrete foundation The formwork fixing member is erected by passing through the on-site concrete placing part, and the formwork fixing member fixes the formwork to the end portion.

According to a second aspect of the present invention, in the first aspect of the present invention, the formwork fixing member is embedded at the end of the precast portion of the precast reinforced concrete foundation at a position facing the on-site concrete placing portion. Embedded nut, a bolt that has one end screwed into the embedded nut and passes through the site concrete placing part to be erected, and can penetrate the formwork, and is screwed to the other end of the bolt. And a tightening nut capable of fixing the mold frame.

[0010]

The invention described in claim 1 has the following operation.
The precast reinforced concrete foundation is fixed to the end of the precast part using a formwork fixing member that passes through the on-site concrete placing part and is erected upright. Can be fixed. As a result,
Regardless of the height dimension of the precast portion of the precast reinforced concrete foundation, it is possible to firmly and reliably fix the formwork around the on-site concrete placing portion of the adjacent precast portion.

The second aspect of the present invention has the following operation. Formwork fixing member, an embedded nut embedded in the end of the precast part of the precast reinforced concrete foundation, a bolt that is screwed into this embedded nut and penetrates the formwork, and a tightening nut that is fitted to this bolt, Since it is configured to have, the mold fixing member can be easily attached to the end portion of the precast portion simply by screwing the bolt into the embedded nut on site.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a precast reinforced concrete foundation to which one embodiment of a formwork fixing structure for a precast reinforced concrete foundation according to the present invention is applied. FIG. 2 is an exploded perspective view showing one embodiment of the precast reinforced concrete foundation formwork fixing structure according to the present invention. FIG. 3 is a front view showing a precast portion of a precast reinforced concrete foundation to which a formwork is attached. FIG. 4 is a view taken in the direction of the arrow IV in FIG. FIG. 5 is a sectional view taken along the line VV in FIG.

As shown in FIGS. 1 and 2, the precast portion 21 of the precast reinforced concrete foundation 20 is produced in advance in a factory or the like.
An on-site concrete placing part 23 is provided at an end portion 22 of the
Is provided.

The on-site concrete placing portion 23 is formed by notching the back surface side of the end portion 22 of the precast portion 21. In addition, upper and lower main rebars 25A and 25B are provided so as to project on the site concrete placing section 23.

In the base concrete placing section 24,
A reinforcing bar 25C protrudes from the lower part of the precast portion 21,
Further, the lower main reinforcing bar 25B is extended. The base 2 has a base 2 that protrudes from the lower part of the precast portion 21 to a position lower than the reinforcing bar 25C.
6 are provided integrally. This pedestal 26 is a lower main reinforcing bar 25
It is configured to include a part of B.

Now, as shown in FIGS. 2, 4 and 5,
At the end 22 of the precast portion 21 of the precast reinforced concrete foundation 20, an insert metal fitting 27 having an internal thread engraved on the inner surface is embedded as an embedded nut at a position facing the on-site concrete placing portion 23.

When the adjacent precast parts 21 are joined at the site, the end parts 22 of the adjacent precast parts 21 are butted against each other so as to surround the site concrete pouring part 23. A form 28 for placing concrete on 23 is arranged as shown in FIGS. 3 to 5. The mold 28 is fixed to the end 22 of the precast portion 21 by a mold fixing member 31 including the insert fitting 27, the bolt 29, and the tightening nut 30.

One end of the bolt 29 is screwed into the insert fitting 27 so that it can be erected while passing through the on-site concrete placing portion 23. Further, the through hole 32 of the form 28 is formed.
(Fig. 2) can be penetrated.

The tightening nut 30 is composed of the bolt 2
9 is screwed to the other end of the mold 28 through the bolt 29,
It can be fixed to the end portion 22 of the precast portion 21.

Next, the procedure for constructing the precast reinforced concrete foundation 20 will be described. The precast portion 21 produced in a factory or the like is transported from the accumulation storage location to the site, and is installed by hanging it at a predetermined position using a crane or the like. At this time,
The precast portion 21 is handled in a standing state with the pedestal 26 as a seating surface.

In this way, a predetermined number of precast parts 2
1 is installed on site and the end 2 of the adjacent precast part 21
2 are butted, and the height of the top end is aligned with that of the adjacent precast portion 21 and positioned.

Next, the upper main rebars 25A and the lower main rebars 25B protruding from the on-site concrete placing parts 23 of the adjacent precast parts 21 are connected to each other on the back side of the precast parts 21 by using a binding or connecting tool. Connecting. Then, the stirrup 33 is arranged between the connected upper main rebar 25A and the lower main rebar 25B at a predetermined pitch, and the abdominal muscles 34 are arranged so as to be orthogonal to these stirrup 33. The abdominal muscles 34 are bound to the stirrup 33 using an iron wire or the like.

Thereafter, a mold (not shown) is provided around the base concrete placing part 24 of the precast part 21, and a form 28 is also installed around the on-site concrete placing part 23 of the precast part 21. When installing the form 28, first, as shown in FIG.
One end of the bolt 29 is screwed into the insert metal fitting 27 of the end portion 22 in the above, and the bolt 29 is erected on the end portion 22. In this erected state, the bolt 29 is in a state of passing through the on-site concrete placing section 23. Next, the bolt 29 is passed through the through hole 32 of the mold 28, and the tightening nut 30 is screwed to the other end of the bolt 29 to tighten the pre-cast form 28 through the bolt 29 and the tightening nut 30. It is fixed directly to the end 22 of the part 21.

Finally, by placing concrete on the base concrete placing portion 24 of the precast portion 21 and then placing concrete on the site concrete placing portion 23, the adjacent precast portions 21 are joined. The integrated precast reinforced concrete foundation 20 is used. FIG.
In (B), reference numeral 36 is a foundation base concrete formed on the base concrete placing portion 24, and reference numeral 35 is an on-site casting concrete formed on the on-site concrete placing portion 23.

According to the above-mentioned embodiment, there are the following effects. Precast reinforced concrete foundation 20
The insert fitting 27 of the formwork fixing member 31 is embedded in the end portion 22 of the precast portion 21 of the
The bolt 29 of the formwork fixing member 31 is erected upright through the on-site concrete placing part 23, and this bolt 29 is used for the formwork 2.
8 and the clamping nut 30 of the mold fixing member 31 is screwed onto the bolt 29 to fix the mold 28. Therefore, the mold 28 can be directly fixed to the end 22 of the precast portion 21. As a result, regardless of the height dimension of the precast portion 21 of the precast reinforced concrete foundation 20, the mold 28 can be firmly and reliably fixed around the on-site concrete placing portion 23 of the adjacent precast portions 21.

Further, the mold fixing member 31 is embedded with the embedded nut 27 embedded in the end 22 of the precast portion 21 of the precast reinforced concrete foundation 20, and the bolt 29 screwed into the embedded nut 27 and penetrating the frame 28.
And a tightening nut 30 screwed to the bolt 29,
The bolt 29 of the formwork fixing member 31 can be easily attached to the end 22 of the precast portion 21 of the precast reinforced concrete foundation 20 by simply screwing the bolt 29 into the embedded nut 30 on the spot. You can

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, the bolt 29 of the formwork fixing member 31 is used in a factory or the like, and the precast portion 21
It may be preliminarily set up at the end 22 of the.

[0028]

As described above, according to the formwork fixing structure of the precast reinforced concrete foundation according to the present invention, in the vicinity of the on-site concrete placing parts of the adjacent precast parts,
A formwork for pouring concrete can be firmly fixed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a precast reinforced concrete foundation to which one embodiment of a form-fixing structure for a precast reinforced concrete foundation according to the present invention is applied.

FIG. 2 is an exploded perspective view showing one embodiment of a precast reinforced concrete foundation formwork fixing structure according to the present invention.

FIG. 3 is a front view showing a precast portion of a precast reinforced concrete foundation to which a formwork is attached.

FIG. 4 is a view on arrow IV of FIG.

FIG. 5 is a sectional view taken along the line VV of FIG. 3;

FIG. 6 is a plan view showing a formwork fixing structure of a conventional precast reinforced concrete foundation.

FIG. 7 is a view taken in the direction of arrow VII in FIG. 6;

FIG. 8 is a perspective view showing the formwork fixture of FIGS. 6 and 7.

[Explanation of symbols]

 20 Precast Reinforced Concrete Foundation 21 Precast Part 22 End 23 Site Concrete Placing Part 27 Insert Metal Fitting (Embedded Nut) 28 Formwork 29 Bolt 30 Tightening Nut 31 Formwork Fixing Member 32 Formwork Through Hole

Claims (2)

[Claims] 1. A mold used for placing concrete at the on-site concrete placing portions of the precast portions adjacent to each other on site, provided with an on-site concrete placing portion at the end of the precast portion of the precast reinforced concrete foundation. In a mold fixing structure of a precast reinforced concrete foundation for fixing a frame around the site concrete placing part, to the end part of the precast part of the precast reinforced concrete foundation, the formwork by passing the site concrete placing part A mold fixing structure for a precast reinforced concrete foundation, characterized in that a fixing member is erected upright and the mold is fixed to the end portion by the mold fixing member. 2. The formwork fixing member comprises an embedding nut embedded at a position of the precast part of the precast reinforced concrete foundation at a position facing the on-site concrete pouring part, and one end of which is screwed into the embedding nut. It has a bolt that can pass through the site concrete placing part and can be erected and can penetrate the formwork, and a tightening nut that is screwed to the other end of this bolt and can fix the formwork. The precast reinforced concrete foundation formwork fixing structure according to claim 1, which is configured as follows.