JPH111930A - Foundation constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation constructing method wherewith movement from one side to the other side of a partition foundation (or a form for partition foundation) can be made easily. SOLUTION: For a foundation constructing method, a deep foundation extending to the depth in the ground and a partition foundation extending to a place not so deeper than the deep foundation and crossing the deep foundation approximately at a right angle are provided. While a form 4 for the deep foundation is installed at the inside of an indent 3 that is formed in the ground, a form 17 for the partition foundation is installed in the direction crossing the deep foundation 4 approximately at a right angle in the ground 18 at a position not deeper than the indent 3, and a place 17a near the part where the form 17 for the partition foundation and the form 4 for the deep foundation are connected together is formed in a structure having a bottom board 24 (24a) and after the place 17a near the connecting part is temporarily installed to the indent 3, concrete is cast into the forms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a foundation for a building such as a house, and more particularly, to a deep foundation extending deep into the ground at the periphery of the building, and a partition foundation extending to a position shallower than the deep foundation. It relates to the method of construction of the foundation.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional basic structure. The deep foundation 1 on the outer periphery of the building extends deep into the ground, for example, with a height H to the upper surface of the wide footing 1a at the lower end of about 1800 mm. A partition foundation 2 extending to a shallow position is joined so as to be orthogonal to the deep foundation 1. At the lower end of the partition foundation 2, a footing 2 c having a substantially semicircular cross section and having alternately convex portions 2 a and concave portions 2 b is provided, and at the joint with the deep foundation 1, the same depth from the partition foundation 2 with the same thickness. Basic 1
Corner connecting portion 2d hanging down toward the footing 1a
Is provided.

FIG. 8 shows an assembled state of a formwork for constructing the foundation. Deep foundation 1 in recess 3 formed by excavating the ground
A pair of inner and outer steel forms 4 are arranged and mounted on a reinforcing bar base 5, and a reinforcing bar 6 is arranged between the steel forms 4. The steel form 4 is supported by the vertical flap 7 and supported by metal or wooden supporting members 8 a and 8 b provided between the recess 3 and the steel form 4. , A pair of inner and outer formwork 9 (such as concrete formwork plywood) for the footing 1a is arranged.

A pair of left and right bent portions 4a (only one side in FIG. 8) which are bent to the indoor side at right angles to the steel formwork 4 at a position corresponding to the partition foundation 2 are provided on the inner steel formwork 4. A pair of left and right steel corner forms 10 extending in the vertical direction in parallel with the bent portion 4a is disposed adjacent to approximately the lower half of the bent portion 4a. It is connected to the bent part 4a by the like.

[0005] Adjacent to the inner ends of the corner forms 11, a partition 12 made of concrete form plywood (hereinafter referred to as a control panel) or an EPS block or the like is arranged in parallel with the steel form 4. , Steel formwork 4 and partition material 1
A support member 13 such as a wooden member is provided between the support member 2 and the support member 2.

[0006] Inside the partition member 12, the concave portion 3 is backfilled with backfill soil 14, and crushed stone 15 (crusher orchid) is laid on the backfill soil 14. And
On the crushed stone 15, a pair of left and right molds 16 made of resin or the like for the footing 2a are installed, and a pair of left and right steel molds for the partition foundation 2 are placed on these molds 16 and the corner formwork 10. A frame 17 is installed, and an outer end of the steel mold 17 is connected to the bent portion 4a.

[0007]

However, in the method of constructing a foundation using a formwork as described above, in order to install the formwork 16 and the steel formwork 17, the corner formwork 10 and the partition member 12 need to be installed. Since the recess 3 is backfilled with the backfill soil 14 around the periphery, after performing the above backfill, work is performed in the recess 3 inside the steel formwork 4 before or after construction of the foundation. When the worker moves from one side to the other side of the partition foundation 2, the worker cannot move through the recess 3, and once climbs on the ground 18 above the recess 3,
Further, it is necessary to move over the steel formwork 17 for the partition foundation 2 or the completed partition foundation 2, and the movement is troublesome.

Further, since the earth pressure of the backfill soil 14 is applied from the partition member 12 to the steel formwork 4 for the deep foundation 1 via the support member 13, the steel formwork 4 is subjected to the above-mentioned earth pressure. It has to be firmly fixed so that it can withstand, and there is a problem that fixing the steel formwork 4 is also troublesome.

Further, the partition member 12 is made of a control panel or an EP.
Procurement of S blocks etc. at the construction site as appropriate, and if necessary,
Since this is used after being processed to a predetermined size, there is a problem that it takes time and effort to assemble the form around the corner connecting portion 2d.

[0010]

According to the present invention, there is provided a partitioning foundation (or a formwork for a partitioning foundation) which solves the above-mentioned problems.
It is an object of the present invention to provide a method of constructing a foundation that can easily move from one side to the other side. Therefore, the method for constructing a foundation according to claim 1 of the present invention includes a deep foundation extending deep into the ground, and a partition foundation extending to a position shallower than the deep foundation and joined so as to be substantially orthogonal to the deep foundation. In the method of constructing a foundation, while forming a concave portion in the ground and installing the formwork for the deep foundation in the concave portion, the formwork for the partition foundation is formed on the ground shallower than the concave portion by the mold for the deep foundation. In the state of being installed in the direction substantially perpendicular to the frame and near the joint of the mold for the partition foundation with the mold for the deep foundation as a formwork structure having a bottom plate, the vicinity of the joint is laid on the recess. After the installation, concrete is poured into each of the molds.

According to a second aspect of the present invention, in the method of the first aspect, the lower end portion of the support rod extending in a substantially vertical direction is supported by the bottom of the recess below the vicinity of the joint. Is connected to the bottom plate.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a basic structure according to the present embodiment. Parts common to those in the conventional example shown in FIG. 7 are denoted by the same reference numerals, and redundant description is omitted. FIG.
In the conventional example, the footing 2c is provided up to a position adjacent to the corner connecting portion 2d of the partition foundation 2, whereas in the present embodiment, the footing 2c is not provided near the corner connecting portion 2d, and instead In the same height range as the footing 2c between the upper portion of the corner connecting portion 2d and the footing 2c, a lower extension 2e having the same thickness as the partition foundation 2 main body is provided. In addition, since the partition base 2 provided with the lower extension 2e instead of the footing 2c tends to have a slightly lower strength, when building the main body of the house, the partition base 2 is provided on the partition base 2 above the lower extension 2e. It is preferable that no pillar is provided.

Next, FIG. 2 shows an assembled state of a formwork for constructing the foundation of the present embodiment. Here, the same portions as those of the conventional mold shown in FIG. 8 are denoted by the same reference numerals, and duplicate description will be omitted. In the present embodiment, a mold 16 made of resin or the like for the footing 2c of the partition foundation 2 is formed to be shorter, and the outer end of the mold 16 is formed with the concave portion 3 and the substantially flat ground 18 shallower than the concave portion 3. It is located near the boundary of.

In the present embodiment, a pair of left and right steel corner forms 20 is used in place of the conventional corner form 10 and the partition member 12 in order to construct the corner connecting portion 2d.
(Only the left side is shown in FIG. 2), and a steel plate for mounting the lower extension 2 e in a height range substantially equal to the form 16 between the upper part of the corner form 20 and the form 16. Is provided. The corner formwork 2
0 and the erection formwork 21 form the partitioning base formwork 2
2.

FIG. 3 is a perspective view showing the assembled state of the partition base passing through formwork 22, and FIG. 4 is a perspective view of the left corner formwork 20. The corner form 20 includes a main body 20a extending in a vertical direction, and a transverse wall integrally provided at a portion other than an upper end of the main body 20a and extending from one end of the main body 20a (the inner end of the house) in a direction orthogonal to the main body 20a. 20b.

The cross wall 20b includes a vertical portion 20c located substantially in the lower half of the main body 20a, and an inclined portion 20d extending obliquely from the upper end of the vertical portion 20c. The flange 20e bent in a direction parallel to the direction is integrally formed. A portion above the inclined portion 20d and corresponding to the upper end of the main body 20a is open.

The right corner form 20 is symmetrical to the left corner form 20. As shown in FIG. 3, the main bodies 20a of the pair of right and left corner forms 20 are connected to each other. The flanges 2 are arranged in parallel with each other at intervals corresponding to the thickness of the connecting portion 2d, and are arranged so that the transverse walls 20b extend toward the opposed corner form 20 side.
The two flanges 20e are connected by metal fittings 11 or the like.

The erection formwork 21 includes a pair of left and right side plates 2.
3 and a bottom plate 24. As shown in the left side plate 23 in FIG. 5, the side plate 23 includes a main body 23a and a bent portion 23b which is vertically bent outward from one end of the main body 23a. The vertical width of the bent portion 23b is larger than the vertical width of the main body 23a, and the bent portion 23b extends below the main body 23a. The right side plate 23 is configured symmetrically with the left side plate 23.

As shown in FIG. 6, the bottom plate 24 is provided with a bolt insertion hole 24b at substantially the center of a flat plate-shaped main body 24a and a downward bent portion 24c around the main body 24a.
To 24e and an upward bent portion 24f are formed. Further, the support rod 2 supporting the bottom plate 24 with the recess 3
5 is a bolt 26, a cylindrical connecting rod 27, and a lower end supporting rod 2
8, a large-diameter fitting portion 27a is formed at the lower end of the cylindrical connecting rod 27, and a substrate 28a is integrally provided at the lower end of the lower-end support rod 28.

The pair of left and right side plates 23 is disposed so that the pair of left and right corner forms 20 and the main bodies 20a and 23a are continuously formed on the same plane. The ends (outer ends of the house) are connected by metal fittings 11 or the like. Further, the bent portion 23b at one end of the side plate 23 is provided with a formwork 16 for the footing 2c having a width wider than the formwork formwork 21.
Is joined to the end.

The bottom plate 24 is horizontally disposed between the lower ends of the both side plates 23, and the both side plates 23 and the bottom plate 24 constitute a generally U-shaped cross-section form whose upper part is open as a whole. The bottom plate 24 is supported by a support rod 25 extending substantially vertically upward from the bottom of the recess 3 below the bottom plate 24. That is, the bolt 26
Is inserted into the hole 24b, and the nut 30 is screwed into each of the upper and lower parts of the main body 24a.
6 is fixed to the bottom plate 24.

When a nut 31 for adjusting the vertical position is screwed to the bolt 26 below the nut 30 and the lower part of the bolt 26 is fitted to the upper end of the cylindrical connecting rod 27, the nut 3
1 is in contact with the upper end surface of the cylindrical connecting rod 27, the vertical position is determined, and the bolt 26 is supported by the cylindrical connecting rod 27. Then, the fitting portion 27a is connected to the lower end support rod 28.
The bottom plate 24 is supported by the bottom of the concave portion 3 via the support bar 25 by burying the lower portion of the lower end support bar 28 including the substrate 28 a in the ground at the bottom of the concave portion 3. . Note that the lower portion of the lower end support bar 28 may be fixed to the bottom surface of the recess 3.

When the foundation is to be constructed using the formwork having the above structure, first, a deep recess 3 is formed in the ground, and a steel form 4 and a footing 1 for the deep foundation 1 are formed in the recess 3.
The mold 9 for a is installed. A crushed stone 15 (crusher orchid) is laid on the ground 18 located on the indoor side from the recess 3 and shallower than the recess 3, and a formwork 16 for the footing 2 c of the partition foundation 2 is installed on the crushed stone 15.

A pair of left and right corner forms 20 is connected to the bent portion 4a of the steel form 4 and a pair of left and right side plates 23 are connected to the corner forms 20 to bend the side plates 23. The part 23b is joined to the end of the formwork 16. Then, as described above, the bottom plate 24 is horizontally disposed between the lower ends of the both side plates 23, and the bottom plate 24 is supported by the support rod 25 extending substantially vertically upward from the recess 3 below the bottom plate 24.

Further, in the vicinity of the upper end of the concave portion 3 adjacent to the mold 16, substantially vertically from the lower end of the mold 16 toward the concave portion 3 in accordance with the boundary position between the mold 16 and the erection mold 21. Extending partition material 32 (control panel or EPS block, etc.)
Place. The upper end of the partition member 32 is brought into contact with the bent portion 23b of the side plate 23 and the bent portion 24c of the bottom plate 24.

Then, the corner form 20 and the erection form 21
The steel form 17 for the partition foundation 2 is installed on the form 16, and the upper end of the side plate 23 and the lower end of the steel form 17 are fixed by the clamp member 33. In this manner, in the present embodiment, in the steel mold 17 for the partition foundation 2, the vicinity of the joint 17 a with the steel mold 4 for the deep foundation 1 and the erection mold 21 located thereunder are recessed. 3 is installed.

Then, fresh concrete is poured into the gap 34 between the partition member 32 and the crushed stone 15 and the fresh concrete is poured into each formwork, and after curing for a predetermined period, each formwork except the bottom plate 24 is removed. By removing, the construction of the foundation is completed. When backfilling the lower part of the deep foundation 1 and the partition foundation 2 including the footings 1a and 2c, the bottom plate 2
4 and the support rod 25 are buried in the ground and used.

According to the above construction method, the partition foundation 2
Concrete is cast into each of the steel formwork 17 in a state in which the vicinity of the joint 17a of the steel formwork 17 with the steel formwork 4 for the deep foundation 1 and the erection formwork 21 thereunder are laid on the recess 3. Since the recesses 3 are not backfilled during the foundation construction stage, the recesses on the indoor side of the steel formwork 4 before the foundation construction or before the backfilling after the foundation construction. 3 can easily pass under the erection formwork 21 or below the lower extension 2e of the installed partition base 2, and can also pass through the erection formwork 21 or the lower extension. Since various members can be transported below the portion 2e, workability is good.

Since the recess 3 is not backfilled when the foundation is being constructed, the earth pressure of the backfill soil does not act on the steel formwork 4 for the deep foundation 1 as in the prior art. Frame 4
Can be fixed relatively easily. Further, since the transverse wall 20b is provided integrally with the corner formwork 20 for constructing the corner connecting portion 2d, the corner connecting portion 2d can be constructed only with the pair of left and right corner formwork 20. As described above, there is no need to use the partition member 12 (see FIG. 8) made of a control panel or the like, and the assembling work of the mold is facilitated.

It is also possible to omit the side plates 23 and to cast concrete by disposing the bottom plate 24 at the lower end position of the pair of left and right steel molds 17 near the joint 17a. As in the present embodiment, when the bottom plate 24 is arranged below the steel formwork 17 via a pair of left and right side plates 23, the corner connecting portion 2 in the completed partition foundation 2 is formed.
The upper part of d and the footing 2c can be connected by the lower extension 2e, which is preferable in terms of strength. Also,
In the vicinity of the joint 17a, the footing 2c is not provided, and the lower extension 2e having the same thickness as the main body of the partition foundation 2 is provided. Therefore, the amount of concrete supported by the bottom plate 24 during construction of the foundation becomes excessively large. However, it is not essential that the thickness of the lower extension 2e be equal to the thickness of the partition base 2 main body.

In the above embodiment, the bottom plate 24 and the support rod 25 are buried, but the upper end of the support rod 25, here, the upper end of the bolt 26 does not protrude above the bottom plate 24. In this case, a sufficient curing period may be provided after the foundation is installed, and the bottom plate 24 and the support rod 25 may be removed and reused.

Further, although a pair of corner forms 20 is symmetrical, for example, one corner form 2 may be used.
0 may be provided integrally with a wide transverse wall, and when the bottom plate 24 is not to be buried, one of the side plates 2 may be provided.
3 and the bottom plate 24 may be formed as an integrated structure, or the corner mold 20 and the side plate 23 may be formed as an integrated structure. Further, in the above embodiment, each mold is made of steel, which has an advantage that the surface shape of the foundation after construction can be stabilized, but it is not essential that each mold is made of steel. .

[0033]

The method for constructing a foundation according to claim 1 of the present invention is as follows.
In a method of constructing a foundation having a deep foundation extending deep into the ground and a partition foundation extending to a position shallower than the deep foundation and joined so as to be substantially perpendicular to the deep foundation, a concave portion is formed in the ground to form the concave portion. While installing the formwork for the deep foundation inside, while installing the formwork for the partition foundation on the ground shallower than the recess in a direction substantially orthogonal to the formwork for the deep foundation, After setting the vicinity of the joint of the formwork with the formwork for the deep foundation as a formwork structure having a bottom plate, the vicinity of the joint is installed on the concave portion in a erected state, and then concrete is poured into each of the formworks. As described above, before or after construction of the foundation, when moving from one side of the partition foundation to the other side in the recess inside the formwork for the deep foundation, the lower space near the joint is removed. Moving through Come, there is an advantage that facilitates the movement of workers.

Further, since the bottom portion of the vicinity of the joint provided on the recess is covered with the bottom plate, concrete poured into the vicinity of the joint at the time of foundation construction is received by the bottom plate. The construction of the foundation is performed smoothly.

Further, the vicinity of the joint is provided in a state of being erected on the recess, and at the stage of placing concrete in each formwork and constructing the foundation, the recess is not backfilled. As described above, the earth pressure of the backfill soil does not act on the deep foundation formwork, and therefore, the deep foundation formwork can be easily installed in the present invention.

According to a second aspect of the present invention, in the method of the first aspect, the lower end of the support rod extending in a substantially vertical direction is supported by the bottom of the concave portion below the vicinity of the joint. Since the upper end of the bottom plate is connected to the bottom plate, after the concrete is poured in the vicinity of the joint, the bottom plate is more stable to the ground via the support rod until the concrete solidifies. And there is an advantage that the reliability of foundation construction is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic structure according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing a formwork structure for installing the foundation.

FIG. 3 is a perspective view showing an assembled state of a formwork for passing through a partition foundation in the formwork.

FIG. 4 is a perspective view showing a corner formwork in the formwork for passing through the partition foundation.

FIG. 5 is a perspective view showing a side plate of the partition foundation passing through formwork.

FIG. 6 is an exploded perspective view showing a bottom plate and a support rod in the partition foundation passing through formwork.

FIG. 7 is a perspective view showing a conventional basic structure.

FIG. 8 is a schematic side view showing a conventional mold structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deep foundation 2 Partition foundation 3 Concave part 4 Steel form (form for deep foundation) 17 Steel form (form for partition foundation) 17a Near joint area 24 Bottom plate 25 Support rod

Claims (2)

[Claims] 1. A method of constructing a foundation having a deep foundation extending deep into the ground and a partition foundation extending to a position shallower than the deep foundation and joined so as to be substantially perpendicular to the deep foundation. While forming and installing the mold for the deep foundation in the recess, the mold for the partition foundation is installed on the ground shallower than the recess in a direction substantially orthogonal to the mold for the deep foundation. After setting the vicinity of the junction with the form for the deep foundation of the form for the partition foundation as a form structure having a bottom plate, the vicinity of the junction is installed in a state of being erected on the recess,
A method for constructing a foundation, wherein concrete is poured into each of the formwork. 2. A bottom portion of the concave portion below the vicinity of the joint portion supports a lower end portion of a support rod extending substantially vertically, and connects an upper end portion of the support bar to the bottom plate. The method for constructing a foundation according to claim 1, wherein