JP2001220890A - Form unit for continuous footing, and method for constructing building foundation using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a construction period by integrally placing earthen floor concrete together with concrete constituting continuous footing, and to effectively ensure moisture proofness of an underfloor space after construction. SOLUTION: A form unit for continuous footing includes a pair of mutually opposed wall forms 12 for constituting rise wall portions 3 of the continuous footing 4, and support devices 13 supporting the respective wall forms 12 from below such that the wall forms 12 float in respective excavated grooves 6. In this form unit, each support device 13 is comprised of a support member 16 for positioning the set height of each wall form 12 such that either one or both of the wall forms 12 each have a lower edge thereof corresponding to a top board surface of earthen floor concrete 5 placed in a plot enclosed by the continuous footing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a form unit for fabric foundation and a method of constructing a fabric foundation using the same.

[0002]

2. Description of the Related Art As the foundation of a building such as a detached house,
Cloth foundations having the same cross-section that is continuous in the wall length direction are widely used, and the cross-section of such a cloth foundation is usually formed in an inverted T-shape, L-shape, or the like, in which a standing wall portion projects from the upper surface of a wide base portion. Is done. The site surrounded by such a cloth foundation will constitute the underfloor space of the building, but if the ground in this site is left as it is, moisture from the ground will accumulate in the underfloor space and the humidity in that space will decrease As a result, corrosion of structural members such as pillars and beams connected to the foundation may be accelerated, and insect damage by termites and the like may be promoted.

Therefore, conventionally, as shown in FIG. 6 (a), earth and sand 43 are back-filled in the excavation grooves 42 around the cloth foundation 41 after the mold release from the mold is completed. 6
As shown in (b), by laying interstitial concrete 44 on the ground in the site surrounded by the cloth foundation 41, moisture from the ground is blocked by the interstitial concrete 44, and the underfloor space 45 is subjected to moisture proof treatment. I am trying to do it.

[0004]

In the above-described conventional method of building a foundation, the excavation groove 42 around the cloth foundation 41 after the mold has been completely removed is filled in, and then the concrete 43 is poured. Since the concrete curing period of the cloth foundation 41 has not been completed, it is not possible to perform the work of placing the concrete 44 between the grounds unless the schedule is different. However, there is a drawback that the time is prolonged. Further, in the conventional construction method, since the slab concrete 44 is connected to the cloth foundation 41 after the concrete has hardened, the slab concrete 4
Since the joint strength between the outer peripheral edge of the base 4 and the cloth foundation 41 is weak and a gap is easily generated in the joint, there is a possibility that moisture in the ground escapes from the gap and the moisture proof property of the underfloor space 45 is reduced. .

Further, the ground in the portion where the excavation groove 42 is backfilled has a lower ground strength than the other portions, and therefore, the interstitial concrete 44 located in the vicinity of the cloth foundation 41.
When a worker, such as a steel frame worker, rides on the portion, cracks may be generated in the soil concrete 44, and such cracks may also reduce the moisture resistance of the underfloor space 45. The present invention has been made in view of the above-described circumstances, and by enabling soil concrete to be cast integrally with the concrete constituting the fabric foundation, the construction period can be shortened, and the moisture resistance of the underfloor space after the construction can be effectively reduced. It is an object of the present invention to provide a form unit for fabric foundation that can be secured and a method of constructing a fabric foundation using the same.

[0006]

Means for Solving the Problems In order to achieve the above object, the present invention has taken the following technical means. That is, the fabric foundation form unit of the present invention comprises a pair of opposed wall formwork for forming the standing wall portion of the fabric foundation, and supports the two wall formwork from below while floating in the digging groove. And a supporting device, wherein the supporting device is provided with a top of soil concrete cast at a lower end edge of one or both of the double-walled forms into a site surrounded by the cloth foundation. It is characterized by comprising a support member for positioning the installation height of the wall form so as to coincide with the end face.

[0007] According to the above-mentioned formwork unit, the pair of wall forms is formed such that one or both of the lower end edges thereof coincide with the top end surface of the slab concrete in the site surrounded by the cloth foundation. After the concrete is installed in the excavation trench, concrete is poured into the portion corresponding to the base and the standing wall of the cloth foundation, and concrete is poured into the site surrounded by the cloth foundation to the level of the top end face. ,
Soil concrete can be cast integrally with the concrete constituting the fabric foundation. For this reason, it is possible to cast earth concrete without waiting for the curing period of the concrete that composes the cloth foundation to elapse, and to shorten the construction period. As a result, there is no gap between the slab concrete and the cloth foundation, and the moisture proofness of the underfloor space can be effectively secured.

In the above-described formwork unit of the present invention,
As a support device, a base member placed in a digging trench,
A supporting member capable of supporting a pair of wall molds facing each other from below and being connected to the base member so that the height can be adjusted, the height of the supporting member is reduced. By adjusting, the installation height of the double-walled formwork can be adjusted. And it is preferable to provide a receiving portion for supporting the reinforcing bar buried in the inside of the cloth foundation on the supporting member whose height is adjustable.

In this case, by connecting the double-walled formwork to the support member and supporting the reinforcing frame on the receiving portion of the support member, the height of the support member is adjusted and the double-sided formwork and the reinforcing frame are combined. The installation height can be adjusted at the same time. For this reason, it is possible to adjust the installation height of the wall form without changing the covering thickness of the upper part of the reinforcing bar frame, and it is possible to prevent a decrease in the quality of the cloth foundation due to the variation in the covering thickness. On the other hand, in the case of a building foundation with soil moisture concrete installed on the site surrounded by the cloth foundation, rainwater tends to collect on the soil concrete after the construction is completed. The worker must work while being immersed in the puddle, and there is a problem that the working efficiency is reduced in this respect.

Therefore, the present invention recommends that a void form for forming a drain hole penetrating the lower part of the upright wall portion of the cloth foundation in the thickness direction thereof is connected to the lower part of the wall form.
In this case, since the drainage hole penetrating the lower part of the standing wall portion is formed by the void formwork, rainwater in the site surrounded by the fabric foundation can be drained to the outside.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 and FIG. 5, a building foundation 1 of the present embodiment has a standing wall 3
And a slab concrete 5 that is integrally connected to the cloth foundation 4 by simultaneous casting of concrete. The cloth foundation 4 is disposed in an excavation groove 6 excavated at a predetermined position on the ground, and at the bottom of the excavation groove 6, a support layer 7 laid with chestnut stone and a support layer 7 on the support layer 7 The thrown-out concrete layer 8 is arranged, and the cloth foundation 4 is constructed on the throw-away concrete layer 8.

On the other hand, the slab concrete 5 is cast in a site surrounded by the standing wall 3 of the cloth foundation 4 which is sectioned in a rectangular shape when viewed from the plane, and the outer peripheral portion of the concrete 5 is covered by the standing wall. 3 is continuously connected to the lower part. Further, a moisture-proof sheet 9 (a sheet containing a termiticide may be provided) is laid on the lower surface side of the base portion 2 and the lower surface side of the slab concrete 5. The outer peripheral edge of the moisture-proof or termite-proof sheet 9 is fixed to the cloth foundation 4 by concrete nails after the concrete cast in the form is hardened.
Is fixed to the upright wall portion 3. In addition, a mesh reinforcing bar may be embedded in the soil concrete 5. Further, as will be described later, since the form unit 11 of the present embodiment has a function of adjusting the height of the wall form 12, the waste concrete layer 8 is omitted and the cloth base is directly placed on the support layer 7. 4 may be constructed.

FIGS. 1 and 2 show a form unit 11 for fabric foundation for constructing the building foundation 1. The form unit 11 is used to form the upright wall 3 of the fabric foundation 4. A pair of wall forms 12 facing each other;
A support device 13 that supports the base material 2 from below in a state of floating in the excavation groove 6, a base formwork 14 for forming an outer peripheral side surface of the base portion 2 of the cloth foundation 4 located on an outer peripheral portion of the building foundation 1,
It has. Among these, there are two types of wall forms 12, a first form 12A having a larger height, and a second form 12B having a smaller height, and the height dimensional difference between these forms 12A and 12B. Is set so as to be the same as the design level difference between the top end face of the slab concrete 5 and the top end face of the base portion 2.

As shown in FIG. 1, when forming an outer wall portion (the left wall portion in FIG. 1) located on the outer peripheral portion of the building foundation 1, a first formwork 12A and a second formwork 12A are formed. 12B are arranged so as to face each other and form an inner wall portion (the right wall portion in FIG. 1) which is located in the middle portion of the building foundation 1.
The second molds 12B are arranged so as to face each other. The support device 13 of the present embodiment can support the base member 15 placed on the disposal concrete layer 8 in the excavation groove 6 and the pair of wall molds 12 facing each other from below, and Support member 16 connected to height 15 so as to be freely adjustable
And

The base member 15 is constituted by erecting a pair of left and right support legs 18 formed in a rectangular cross section on both left and right sides of a rectangular metal base plate 17.
The base plate 17 is provided with a pair of front and rear mark holes 20 that can determine the direction of the plate 17 by matching the ink strike line 19 provided on the throw-away layer 8. The support member 16 has a receiving metal fitting 22 having form receiving parts 21A and 21B at both ends capable of removably fitting a lower end edge of the wall form 12 from above, and a hanging part at both ends of the receiving metal fitting 22. A pair of left and right screw rods 23 projecting in a shape are provided, and an adjusting nut 24 screwed into each of the screw rods 23 so as to be fitted externally. The support legs 18 of the base member 15 are
It has a cross-sectional width that allows the screw bar 23 to be inserted with some play in the left-right direction, and has a cross-sectional height smaller than the diameter of the adjustment nut 24.

For this reason, the installation height of the support member 16 can be adjusted by turning the adjustment nut 24 with the screw rod 23 inserted through the support leg 18. Further, since the screw rod 23 is inserted with some play in the width direction of the support leg 18, the center position of the wall frame 12 can be finely adjusted even after the wall frame 12 is connected to the support member 16. It has become. The receiving fitting 22 is formed so as to be bent so that the height levels of the form receiving parts 21A and 21B at both ends thereof are different, and the difference in height between the two form receiving parts 21A and 21B is as follows. The level difference is set so as to be the same as the design level difference between the top end surface of the clay concrete 5 and the top end surface of the base portion 2.

Therefore, as shown in FIG.
A is connected to the lower form receiving part 21A and the second form 12B is connected to the higher form receiving part 21B, so that the double-walled forms 12A and 12B are at the height of the upper edge thereof. Can be set in an aligned state. In addition, as shown in FIG. 1, when forming an inner wall portion (a wall portion on the right side in FIG. 1) located in a through portion of the building foundation 1, the base portion 2 is formed.
Without using the base formwork 14 for constructing the above, the second formwork 12B having the same height dimension is arranged facing each other as described above, so in the case of the support member 16 used for this portion, The receiving metal fittings 22 in which the form receiving parts 21B at both ends have the same height level are used.

A reinforcing bar receiving portion for supporting a reinforcing bar frame 25 buried inside the cloth foundation 4 is formed by bending the central portion of the receiving metal fitting 22 in a substantially upward U-shape in a front view. 26 are formed. The reinforcing bar frame 25 according to the present embodiment includes a horizontal reinforcing bar 27 buried in the base portion 2 and a vertical reinforcing bar 28 buried in the standing wall portion 3. These reinforcing bars 27, 28 are connected to each other by welding or the like. Have been. The form unit 1 of the present embodiment further includes a void form 31 for forming a drain hole 30 that penetrates a lower portion of the upright wall portion 3 of the cloth base 4 in a thickness direction thereof. As shown in FIGS. 3 to 5, the void mold 31 is detachable from a box frame 32 formed by forming a sheet metal into a hollow box shape having an upper opening, and a circular hole provided on a side surface of the box frame 32. And a cylindrical member 33 made of a cylindrical paper tube.

The box frame 32 is formed in a tapered shape with four peripheral sides tapering downward, and includes a connection plate 34 that can be screwed to a flange portion forming a lower edge of the second mold frame 12B. It is provided on the upper opening edge. Also, inside the box frame 32, a handle bar 3 functioning as a hand-held portion when the box frame 32 is pulled out upward.
5 are installed. Note that the handle bar 35 also has a function of pressing the cylindrical member 33 inserted through the box frame 32 from above to ensure its fixation. As shown in FIGS. 3 and 5, the void form 31 is disposed below the second form 12A by screwing the connection plate 34 to a flange portion at a lower edge of the second form 12B. At this time, it is set so that the protruding end of the cylindrical member 33 contacts the inner surface of the first mold frame 12A.

For this reason, after concrete is hardened, the wall form 12 is removed, and then the box frame 32 is withdrawn upward, and the paper tubular member 33 is broken and taken out, so that the standing wall 3 of the cloth foundation 4 is removed. A drain hole 30 penetrating through the lower part of the base in the thickness direction is formed. The drain hole 30 may be filled with concrete at an appropriate time, or may be left as a drain hole in the underfloor space through an elbow pipe (not shown).

Next, a method of constructing the building foundation 1 using the formwork unit 11 will be described. That is, in order to construct the building foundation 1, first, the excavation groove 6 is excavated at a predetermined position on the ground where the cloth foundation 4 is to be arranged, and at the bottom of the excavation groove 6,
The stone is laid and the concrete is thrown away. next,
The center position of the cloth base 4 is accurately ink-printed on the upper surface of the disposal concrete layer 8, and the base members 15 are placed at appropriate intervals in accordance with the black ink lines, and are supported on the support legs 18 of the base member 15. The screw member 23 of the member 16 is inserted through the support member 16.
Is connected to the base member 15 side.

Thereafter, by adjusting the adjusting nut 24 while measuring the height of the support member 16, the support member 16 is set at a predetermined height, and then the reinforcing bar frame 25 is connected to the reinforcing bar receiving portion 26 of the support member 16. And each wall form 1
2 are connected to both the mold receiving portions 21 of the support member 16. Then, once again checking the installation height and the street of the wall formwork 12, the upper ends of the wall formwork 12 are connected to each other by a connecting member (not shown), and the wall formwork 12 is further turned by a turnbuckle or the like. Fix to the ground side. As shown in FIGS. 1 and 5, the base formwork 14 of the cloth foundation 4 located on the outer peripheral portion of the building foundation 1 is erected at a predetermined position of the disposal concrete layer 8.

When the setting of the form unit 11 is completed, concrete is poured into the form. At this time, the concrete placing order is such that the portion corresponding to the base portion 2 of the cloth foundation 4 is made to go around the entire formwork so as to be filled with concrete, and then the portion corresponding to the standing wall portion 3 of the cloth foundation 4 is Make a full round of the formwork to fill it with concrete. And finally, in the site surrounded by the standing wall portion 3 of the cloth foundation 4, until the lower edge of the second formwork 12B positioned at the same level as the design top end surface of the soil is reached, Concrete 5 is poured.

After the concrete casting operation is completed as described above, after the concrete has hardened, the wall formwork 12, the base formwork 14 and the void formwork 31 are respectively removed from the mold, and the outer periphery of the building foundation 1 is removed. The excavation groove 6 of the part may be backfilled with earth and sand. Thus, the form unit 11 of the present embodiment
According to this, the wall formwork 12 can be set such that the lower end edge of one or both of the pair of wall formworks 12 facing each other coincides with the top end surface of the concrete slab 5, Soil concrete 5 can be cast integrally with concrete constituting the cloth foundation 4.

For this reason, it is possible to cast the earth concrete 5 without waiting for the curing period of the concrete constituting the cloth foundation 4 to elapse, and the construction period can be shortened.
Since the interstitial concrete 5 is connected to and integrated with the concrete of the cloth foundation 4 before hardening, it is possible to prevent the occurrence of a gap between the interstitial concrete 5 and the cloth foundation 4. Note that the present invention is not limited to the above embodiment. For example, the reinforcing bar frame 25 may be fixed in the excavation groove 6 separately from the wall formwork 12 without providing the reinforcing bar receiving portion 26 on the support member 16.

However, separately from the reinforcing frame 25, the wall form 12
When only the height is adjusted by the support member 16, the relative height of the wall form 12 with respect to the reinforcing frame 25 also changes due to the adjustment, and the concrete covering thickness above the reinforcing frame 25 fluctuates, and The quality of the foundation 4 may be reduced. Therefore, when adjusting the height of the wall formwork 12, it is preferable to adjust the height of the reinforcing bar frame 25 simultaneously with the wall formwork 12 as in the above embodiment. Further, the present invention can also be adopted when constructing a non-reinforced fabric base 4 having no reinforcing bar frame 25.

[0027]

As described above, according to the present invention,
Since the soil concrete can be cast integrally with the concrete constituting the cloth foundation, the construction period can be shortened, and the moisture resistance of the underfloor space after the construction can be effectively secured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a building foundation and a formwork unit for constructing the same according to the present invention.

FIG. 2 is an assembled perspective view of the same formwork unit.

FIG. 3 is a sectional view of a portion where a void form is installed in the building foundation and the form unit.

FIG. 4 is a perspective view of a void formwork.

FIG. 5 is a perspective view of corners of the building foundation and the formwork unit.

FIG. 6 is a schematic view showing a conventional method of constructing earth concrete.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building foundation 2 Base part 3 Standing wall part 4 Fabric foundation 5 Soil concrete 6 Excavation groove 13 Supporting device 15 Base member 16 Support member 26 Reinforcement receiving part 30 Drainage hole 31 Void formwork

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuichi Inoue 3-12-12 Minamisenba, Chuo-ku, Osaka-shi, Osaka Kubota House Co., Ltd. F-term (reference) 2D046 BA00 BA01 BA11 BA41 2E177 EA05

Claims (5)

[Claims] 1. A pair of opposed wall forms (12) for forming an upright wall (3) of a cloth foundation (4), and the two wall forms (12) are placed in a digging groove (6). A support device (13) for supporting the device from below in a floating state, wherein the support device (13) is one of the double-walled formwork (12) or A support for positioning the installation height of the wall formwork (12) so that both lower edges thereof coincide with the top end face of the slab concrete (5) cast in a site surrounded by the cloth foundation (4). A form unit for fabric foundation, comprising a member (16). 2. The support device (13) is capable of supporting a base member (15) placed in the excavation groove (6) and a pair of wall forms (12) opposed to each other from below, and The form unit according to claim 1, further comprising a support member (16) connected to the base member (15) so as to be adjustable in height. 3. A receiving member (2) for supporting a reinforcing steel frame (25) embedded in a cloth foundation (4).
3. The fabric foundation form unit according to claim 2, comprising (6). 4. A void form (31) for forming a drain hole (30) penetrating a lower part of an upright wall (3) of a cloth foundation (4) in a thickness direction thereof is provided on the wall form (12). The form unit for a cloth foundation according to any one of claims 1 to 3, which is connected to a lower end portion. 5. A method for constructing a building foundation having the following steps (a) to (c): (a) a digging trench (6) at a predetermined position on the ground;
(B) A pair of opposing wall formwork (12) for forming the upright wall (3) of the cloth foundation (4), the lower edge of one or both of which is the lower edge. Formwork setting step of setting in the excavation groove (6) so as to coincide with the top end surface of the slab concrete (5) in the site surrounded by the cloth foundation (4) (c) Base of the cloth foundation (4) Concrete casting step of placing concrete in a portion corresponding to the section (2) and the standing wall section (3), and placing concrete to the level of the top end surface in a site surrounded by the cloth foundation (4).