JP2963613B2 - Foundation structure and construction method - 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 structure constructed on the ground of a building, and more particularly to a foundation structure capable of simplifying a footing construction work at a construction site and a method of constructing the foundation structure.

[0002]

2. Description of the Related Art In order to construct a building in a stable state, it is necessary to construct a foundation on the ground stably and accurately. Conventionally, a foundation part for a house is formed by first excavating the ground of a building construction part continuously, forming a root cutting part, laying a gravel on the root cutting part, continuously forming a formwork, and supporting it through a support means. It has been constructed by erecting and supporting the leverage form, casting concrete in the formwork, curing and solidifying, removing the formwork, and surface-treating with mortar.

[0003] However, in the above-mentioned conventional foundation construction work, the work of continuously erecting the formwork along the root cutting portion is performed by:
This was troublesome, leading to a longer construction period and increased costs. In addition, the work of curing concrete also requires several days, which causes the construction period to be prolonged, and the removal of the formwork and the mortar treatment are also troublesome.

[0004] In order to simplify and speed up the work of constructing a foundation at a construction site, Japanese Patent Laid-Open No. 3-129 has been proposed.
As described in Japanese Patent Publication No. 018, a construction type in which a precast concrete (hereinafter, referred to as PC) foundation preliminarily manufactured at a factory stage is installed at a root cutting portion was considered.

Further, the applicant has filed Japanese Patent Application No. 5-25106.
No. 3 proposed a PC base in which a footing portion was integrally formed at a lower end portion of a rising portion. According to this PC foundation, the concrete placing and curing work can be simplified.

[0006]

However, even with this construction type, concrete must be cast under the connection portion of the PC foundation in order to connect the PC foundations at the connection portion. .

For this purpose, it is necessary to form a formwork. However, the formwork is conventionally generally made of wood, and this formwork is buried and disposable. Cannot be suppressed sufficiently. Also, it is not suitable for preservatives.

Also, at the corners of the foundation where the PC foundation is connected at a right angle, the mold must also be assembled at a right angle. Becomes impossible.

Japanese Patent Laid-Open Publication No. Sho 59-22854 discloses a plastic mold.
This formwork is used to build a cast-in-place foundation, and is different from a formwork for joining PC foundations together.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to simplify a footing construction curing operation by using a PC base having a footing portion, and to provide a connection portion between PC bases. It is an object of the present invention to provide a foundation structure and a construction method capable of easily installing a formwork for injecting concrete for joining with an inexpensive material.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a method in which a ground is continuously excavated in a construction area of a building and a root cutting portion formed at predetermined intervals. A step of installing a plurality of precast concrete bases, and a plurality of footing sections integrally formed avoiding the precast concrete bases, and having a footing portion projecting downward at a predetermined distance from the ground. Laying a precast concrete foundation on the precast concrete base, and installing a formwork for a concrete casting area section around a connection portion between the adjacent precast concrete foundations, The mold is characterized by being formed of a synthetic resin or metal sheet member.

In this construction method, the ground is dug, for example, in the building construction area to form a root cut, and a plurality of PC bases are installed at predetermined intervals in the root cut, and a PC foundation is mounted on the PC base. Erection.

This PC foundation can be installed upright independently of the bottom of the PC so that the PC foundation can stand upright independently and has a footing part, which simplifies concrete casting and curing work at a construction site. it can.

Further, since the footing portion is formed so as to avoid the PC bottom plate, it does not hinder the crossing of the PC foundation between the PC bottom plates. Since the footing portion has a predetermined space formed between the footing portion and the ground, the concrete can be integrated with the ground by pouring concrete.

Further, a PC whose base is manufactured in advance in a factory
And the surface is finished, so that the mortar treatment at the construction site can be omitted.

Although the footing construction work can be simplified by using such a PC base, the footing portion of the PC base is formed in a shape avoiding the PC bottom plate.
It is necessary to cast concrete at the connection between the PC foundations placed on the bottom plate and join them together.

Therefore, in this construction method, a form for partitioning the concrete placing area is assembled around the connection portion between the PC foundations by the sheet-like member.

Since the sheet member is made of a synthetic resin or metal sheet member, the sheet member is not corroded and can be made cheaper than a wooden mold. Costs can be reduced.

The sheet member may be, for example, a corrugated plate or a net, in addition to the flat plate, but in any case, the sheet has a strength enough to block earth and sand. There must be. Further, in the case of a net-like material, it is necessary to have a mesh fineness such that earth and sand do not flow.

Next, a second aspect of the present invention is a step of installing a plurality of precast concrete floors at predetermined intervals at a root cut formed by continuously excavating the ground in a building construction area, A plurality of precast concrete foundations integrally formed avoiding the concrete floor, and having a footing part projecting downward at a predetermined distance from the ground, and projecting downward at a right angle on the precast concrete floor. Erection and installing a formwork for a concrete placement area section around a right angle connection between adjacent precast concrete foundations, wherein the formwork is a bendable or bendable composite The right-angled connection portion is constituted by a sheet member made of resin or metal, and the sheet member is bent or bent. Characterized by partitioning the concrete providing region corresponding to.

[0021] In this construction method, in addition to the structure of the first aspect of the invention and the operation and effect thereof, a plurality of PC foundations are connected at right angles, and the formwork is formed by a bendable or bendable sheet member. Have been. Therefore,
The formwork can be easily formed by bending or folding in the right angle direction corresponding to the right angle connection part.

Next, a third aspect of the present invention is characterized by being constructed by the method for constructing a foundation structure according to the first or second aspect.

This basic structure is provided in claim 1 or claim 2.
It is constructed with the described configuration, and exhibits these functions and effects.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state before a formwork is installed in a foundation structure according to an embodiment. In FIG.
The PC bottom board 3 in which the C cloth foundation 10 is installed in the root cutting section 20
It is erected between 0.

The root cutting portion 20 is formed by digging the ground 100, and a PC bottom 30 is installed at a corner of the root cutting portion 20 and at a predetermined position.

Since the PC bottom 30 is a reinforced concrete plate having a reinforcing bar (not shown) therein, the work of disposing the reinforcing bar on the PC bottom 30 at the construction site can be omitted. . Further, the PC bottom board 30 has a smooth upper surface, so that when the PC cloth base 10 is erected, blackout for alignment can be performed on the upper surface.

Then, the PC bottom board 30 is connected to the root cutting section 20.
When the mortar 22 is installed on the mortar 22, the mortar 22 is mounted on the mortar 22 so that the mortar 22 is crushed. And this PC
An adjustment operation is performed by hitting the bottom plate 30 with a hanging arrow or the like so that the upper surface becomes substantially horizontal at a predetermined height. This operation is performed while checking the horizontal level and the height using a leveler using a water thread, a level, or a laser beam.

Next, a description will be given of the PC cloth base 10 installed between the PC bottom boards 30 thus installed. As shown in FIG. 1, there are two types of PC cloth foundations 10, and a PC cloth foundation 12 having concave portions 11 formed at both ends (right side in FIG. 1).
And a PC cloth base 14 (left side in FIG. 1) in which a concave portion 11 is formed at one end and a convex portion 13 is formed at the other end.

FIG. 2 is a sectional view showing a P-type structure in which concave portions 11 are formed at both ends.
The C cloth foundation 12 is shown, (1) is a plan view thereof, and (2) is a front view thereof. The PC cloth base 12 has a rising portion 16.
And a footing unit 18.

The rising portion 16 is for mounting and supporting a building on the upper end surface, and is formed in a rectangular parallelepiped shape with a predetermined thickness.
Reinforcing reinforcing bars (not shown) are buried inside and are made of concrete, and concave portions 11 having a thicker wall and a U-shaped cross section are formed at both ends. When joining the PC fabric foundations 12 in a straight line, the respective recesses 11 are installed facing each other, and a reinforcing bar is disposed inside the recesses 11 and concrete is cast to strengthen the connecting portions. It has become.

The footing portion 18 is for supporting the rising portion 16 upright, and is formed on both sides of the rising portion 16 so as to protrude laterally and downwardly from the lower end with a reinforcing bar (not shown) therein. Have been. The footing portion 18 is formed at the center of the rising portion 16, and the footing portion 18 is formed on the side surface of the concave portion 11.
Is not formed. Therefore, as shown in FIG. 1, this PC cloth base 12 can be placed on the PC bottom panel with the lower surface of the concave portion 11 as a bridge. The footing portion 18 has a predetermined gap formed between the footing portion 18 and the ground of the root cutting portion 20 so that concrete can be poured into the gap.

The footing portion 18 has a concrete filling port 19 formed therein. The concrete filling port 19 is, as shown in FIG. 2A, a plurality of rectangular holes penetrating from the upper surface to the lower surface of the footing portion 18. Then, the footing section 18 is moved to the ground 100
It can be fixed firmly.

Next, FIG. 3 shows a PC cloth base 1 in which a convex portion 13 is formed at one end and a concave portion 11 is formed at the other end.
4, (1) is a plan view thereof, and (2) is a front view thereof. The PC cloth base 14 differs from the PC cloth base 12 in that the PC cloth base 14 has a protrusion 13 at one end.

The protrusion 13 is formed at the corner of the foundation.
To join the PC cloth base 12 at a right angle,
6 is formed at one end thereof so as to project at right angles to the axis. A reinforcing bar (not shown) protrudes from the front end face of the convex portion 13, and the PC cloth base 1 to which the reinforcing bar is to be joined.
When the concrete is inserted into the concave portion 11 and the concrete is poured into the concave portion 11, cured and solidified, the PC cloth base 12 and the PC cloth base 14 can be firmly connected.

The footing portion 18 is not formed at the end where the convex portion 13 is formed.
Is formed at the center of the rising portion 16. Other configurations are the same as those of the PC fabric base 12.

The PC cloth base 12 and the PC cloth base 1
No. 4 is in a state where the surface is previously treated in a factory.

These PC cloth foundations 10 are made of PC
The installation position is marked on the upper surface of the bottom plate 30 to be aligned, and then placed between the PC bottom plates 30 to be placed. This P
Since the footing portion 18 is integrally formed on the C-cloth base 10, the work of building the footing at the construction site can be simplified.

However, as described above, the PC cloth base 12
The footing portion 18 is not formed on the side surface of the concave portion 11 and the footing 18 is not formed on the side surface of the convex portion 13 on the PC cloth base 14.

Therefore, as shown in FIG. 1, the portions where the PC cloth base 12 and the PC cloth base 14 are connected at right angles are:
The footing 18 will not be formed. And
Concrete is poured into this right-angled connection part at the construction site and the two are integrally connected.

For this reason, it is necessary to install a formwork in order to partition the concrete placing area from earth and sand. FIG.
FIG. 2 is a plan view showing a state where a formwork is installed on the PC basic structure shown in FIG. 1.

In the figure, the formwork includes a corrugated plate 42 installed on the inner corner side of the PC foundations 12 and 14 connected at right angles,
And a corrugated sheet 44, 44 installed on the outer corner side. FIG. 5 is a perspective view of the corrugated plates 42 and 44. FIG.

In FIG. 5, corrugated plates 42 and 44 are both made of synthetic resin and are made of corrugated thin plates. For example, those that are widely used as garages and roofs of corridors and are well known are used. Used. Also, this corrugated sheet 42,
44 is inexpensive and easily available, and it is possible to reduce the cost in addition to the fact that there is no need to newly manufacture.

As shown in FIG. 4 or FIG. 5, the corrugated plate 42 on the inner corner side of the PC cloth foundations 12 and 14 is set in a bent state, and a wave is formed in a lateral direction so as to be easily bent. is set up. On the contrary, the corrugated sheet 44 on the outer angle side,
As shown in FIG. 5, 44 is installed in a state where waves are formed in the vertical direction, and by joining a pair of corrugated plates 44, 44 at a right angle, on the outer corners of the PC cloth foundations 12, 14. It is partitioned correspondingly.

When the corrugated plate 44 is installed, one surface is brought into contact with the side surface of the footing portion 18 in the state shown in FIG. 5 and the other surface is filled with earth and sand. In addition, corrugated sheet 4
When installing 2, it is bent as shown in FIG. 5, and one surface is brought into contact with the side surface of the footing part 18 as shown in FIG. Thus, FIG.
As shown in the figure, the corrugated plates 42, 44 are supported in a state sandwiched between the footing portion 18 and the ground 100, and the concrete placing area 50 can be defined as a formwork.

When the formwork is installed in this way, if concrete is poured into the concrete placing area 50 and cured,
The PC fabric bases 12, 14 connected at right angles can be combined and integrated. In addition, it is preferable that the corrugated plates 42 and 44 are backfilled without being removed, and the removal operation is omitted.

Also, concrete is poured into a concrete filling port 19 formed in the footing section 18, cured and solidified, and the footing section 18 is moved to the ground 100.
Fixed to. Here, since the footing part 18 serves as a cover for the cast concrete, it may be backfilled immediately after casting and before curing.

At this time, the ground 100 and the footing 1
A gap is formed between the concrete filling port 19 and the concrete filling hole 19 when the concrete is poured. Can be reliably filled.

In this operation, compared with the operation of constructing the entire footing, the concrete to be cast is small, so that the curing period is short, and the concrete placing and curing operations can be simplified. When the concrete is poured into the concrete filling port 19, cured and solidified, the footing portion 18 can be firmly fixed to the ground 100.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention.

For example, in the above-described embodiment, the present invention is applied to a joint portion between PC bases connected in an L-shape. However, the present invention is not limited to this. The present invention may be applied to the connecting portion of the. This is because even if the connection is made in a T-shape, the connection is made at a right angle.

In FIG. 4 or FIG.
The corrugated plate 42 may be bent at a right angle in the same manner as the corrugated plate 42, or a pair of the corrugated plates 42 may be joined at a right angle similarly to the corrugated plate 44. In addition, these corrugated plates 42, 4
The material 4 is not limited to a material made of a synthetic resin, and may be a metal as long as it has a strength for blocking earth and sand.

Alternatively, as shown in FIG.
2, 54 may be used. These net-like sheets 52 and 54 are also made of synthetic resin or metal, but they need to have a strength enough to block earth and sand and a mesh fineness to the extent that earth and sand cannot enter.

[0054]

As described above, according to the first aspect of the present invention, since the sheet member is formed of a synthetic resin or metal sheet member, an inexpensive mold can be obtained. This has the effect of reducing costs. Further, since the PC base has the footing section, there is an effect that the footing construction work at the construction site can be simplified.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the sheet member can be bent or bent, so that the sheet member is bent in the right-angle direction corresponding to the right-angled connection portion. Or, there is an effect that the mold can be easily formed by folding.

The third aspect of the present invention provides the first aspect of the present invention.
Or, it is constructed with the configuration according to claim 2,
These effects can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state before installing a formwork in a foundation structure according to an embodiment.

FIG. 2 shows a PC cloth base having recesses formed at both ends,
(1) is a plan view thereof, and (2) is a front view thereof.

FIG. 3 shows a PC cloth base in which a convex portion is formed at one end and a concave portion is formed at the other end, and (1) is a plan view thereof.
(2) is the front view.

FIG. 4 is a plan view showing a state where a mold is installed on the PC basic structure shown in FIG. 1;

FIG. 5 is a perspective view showing a corrugated plate in FIG. 4;

FIG. 6 is a perspective view showing a modification of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 PC cloth foundation 16 Rise part 18 Footing part 20 Root cutting part 30 PC bottom board 42,44,52,54 Corrugated board 50 Concrete placing area 100 Ground

Claims (3)

(57) [Claims] 1. A step of arranging a plurality of precast concrete bases at predetermined intervals in a root cut formed by continuously excavating the ground in a building construction area, and integrally forming the precast concrete bases avoiding the precast concrete bases. Laying a plurality of precast concrete foundations having a footing portion projecting downward at a predetermined distance from the ground and projecting downward on the precast concrete bottom foundation; Setting a formwork for a concrete casting area section around the connection between the two, and the formwork is made of a synthetic resin or metal sheet member. Construction method of the basic structure to be done. 2. A step of arranging a plurality of precast concrete bases at predetermined intervals in a root cut portion formed by continuously excavating the ground in a building construction area, and integrally forming the precast concrete bases avoiding the precast concrete bases. A plurality of precast concrete foundations having a footing portion projecting downward at a predetermined interval from the ground and projecting downward from the ground, and erection at right angles on the precast concrete base, Installing a formwork for a concrete casting area section around the right angle connection between the concrete foundations, wherein the formwork is a bendable or bendable synthetic resin or metal sheet member. This sheet-shaped member is bent or bent to form a concrete prick corresponding to the right-angled connection part. A method for constructing a foundation structure, wherein the construction area is divided. 3. A foundation structure constructed by the method for constructing a foundation structure according to claim 1.