JPH086333B2 - Concrete foundation construction method, concrete foundation footing section formwork casing, and underground beam section formwork panel - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to efficiently and inexpensively form a concrete foundation composed of an underground beam portion or footing portion made of concrete and an earth drill pile provided under the footing portion even in a small site. The present invention relates to a building method, a casing for a footing part of a concrete foundation thereof, and a panel for an underground beam part formwork.

[0002]

2. Description of the Related Art Conventionally, a concrete foundation composed of an underground beam portion, a footing portion, and an earth drill pile that supports the footing portion is first excavated by the earth drill method from a position where the site has been deeply dug in advance. The ground drill pile is then formed by inserting a reinforced basket into the drill hole and placing concrete.
In this case, the bentonite liquid and impurities injected during excavation floated up, so extra concrete had to be placed to obtain the proper concrete strength up to the footing position. Therefore, after pouring the concrete, unnecessary concrete on the upper part of the earth drill pile was put in, and then a predetermined formwork was provided to form a footing portion and an underground beam portion. Further, in this case, after the concrete is cured and the formwork is removed to form the footing portion and the underground beam portion, it is necessary to backfill the soil to a predetermined height.

[0003]

However, in this conventional concrete foundation construction method, since the ground is dug deeply, when the site is small, pile retaining with sheet pile or H-shaped steel is required. In this case, an extra space is required for workers to go inside and do rebar construction and formwork work.If there is no place for excavated soil, it must be discarded. There was a problem that extra work and cost would be required since it would have to be newly carried in for backfilling after the construction. In addition, since the upper part of the earth drill pile after placing concrete is mixed with slime and hardened, the top part of the earth drill pile is processed after the formation of the earth drill pile to process the earth drill pile head. There is a problem that it takes a long time for manpower, waste is generated, and it causes noise pollution.

The present invention has been made to solve the above-mentioned conventional problems, and its object is to provide a concrete foundation having a footing portion and an underground beam portion even if the site is small. It can be constructed without piers, and it does not require extra digging and soil loading / unloading for that purpose, and does not incur extra costs.It also shortens the construction period and eliminates waste and noise pollution. It is to provide a method for constructing a concrete foundation.

[0005]

As a means for achieving the above object, in the concrete foundation construction method according to claim 1 of the present invention, holes for forming footing portions are opened at predetermined intervals on the ground surface with an earth drill, and the outside is formed. After inserting the casing,
A basket-shaped rebar with an opening form frame attached to the rebar is installed along the inner surface of the outer casing in order to open the opening by opening the opening in the concrete with a width that connects the underground beam part with the inside of the footing part. The inner casing is inserted inside the reinforcing bar and the opening mold to form a footing part formwork with double casings, and then concrete is placed in the footing part formwork to form the footing. After forming the outer shell part of the footing part that also doubles as a soil retaining hole for the part forming hole, after forming the outer shell part, a pile driving hole is opened downward from inside the outer shell part by the earth drill method and the reinforcing bar basket is inserted. Then, concrete is poured into the hole for pile driving, and the slime that floats in the outer shell part is removed after the concrete is piled up to the surplus and a ground drill pile that is continuous with the lower part of the outer shell part is formed. , This After forming the ground drill pile, the ground drill casing and the inner and outer casings are removed, and a ground casing is provided with holes for forming a ground beam formwork guide at positions on the ground surface where the outer shells pass each other. Insert the, the panel made of concrete as a weir board to provide a beam width of the underground beam portion to stand upright in the cylindrical casing, and place concrete between the cylindrical casing and the panel made of concrete to After forming the underground beam formwork guide in which the panel made of concrete resists earth pressure, the cylindrical casing is removed, and the underground beam part is placed on the ground surface between the outer shell part and the underground beam part formwork guide. By forming a formation groove, and erected concrete underground beam form panel on both sides of this underground beam formation groove and connecting it with the underground beam form guide, the underground beam form is formed. Forming a frame , It was decided to form a ground beam portion and the footing portion by Da設 concrete after Haisuji rebar continuous with the underground beam portion formwork in the said shell portion.

According to a second aspect of the present invention, there is provided a reinforcing bar continuous side opening formwork, which is an opening formwork used for a continuous part of a reinforcing bar for a footing part in the concrete foundation construction method according to the first aspect. It has a width substantially the same as that of an underground beam part that is integrally connected and has a thickness that dams the inside of the double casing, and is formed in a two-part shape with a foamed resin material. Through-holes are provided and reinforcing bar insertion grooves are provided on the mating surface sides.

According to a third aspect of the present invention, there is provided an opening form used for the both end gathering portions of the reinforcing bar for the footing part in the concrete foundation construction method according to the first aspect. And a pair of panels blocking the inside of the double casing with the beam width of the underground girder that is integrally provided with the panel, and between the panels is closed and the both ends of the reinforcing bar are detachably fixed between the panels. After removing the casing, the footing outer shell has a resistance against earth pressure, and a joint plate having an opening / closing opening at the bottom is provided.

In the concrete foundation construction method according to claim 4, in the concrete foundation construction method according to claim 1, in the concrete foundation construction method according to claim 1, the lower casing from the inner casing to the outer casing is provided. After establishing a communication port and driving the ground drill pile,
While the slime rises, a slime disposal hole is opened beside the outer shell by the earth drill method, and the floating slime is allowed to flow down to the slime disposal hole through the communication port, so that the slime is outside the formwork of the footing section. I decided to eliminate it.

According to a fifth aspect of the present invention, there is provided a casing for a footing section formwork, wherein through holes for discharging slime are respectively formed in the lower portions of the outer casing and the inner casing for the footing section formwork used in the concrete foundation construction method. And a frictional force reducing material for reducing earth pressure on the outer surface of the outer casing.

According to a sixth aspect of the present invention, there is provided an underground girder formwork panel according to the first aspect, which is used for the concrete foundation construction method, wherein the outer frame portion of the panel is a square pipe. And an L-shaped joint and a T-shaped joint for inserting the fitting portion into the end portions of the square pipes and fixing the square pipes in an orthogonal state, and concrete is formed in the outer frame portion of the square pipes. Is formed into a panel shape, and in the state where the panels are opposed to each other, a vertical guide rail for locking the separator is provided at an opposing position which is an inner surface side thereof, and the lower sides are connected to each other. A structure is provided in which a connecting plate that withstands the earth pressure during backfilling and that maintains the set thickness of the underground beam is provided.

In the separator according to claim 7, the separator according to claim 6 is used.
A separator for use in a panel for an underground beam part form described, wherein a locking part that is inserted from above the vertical guide rail and locks both sides to the vertical guide rail, and an underground beam part The formwork panels are held at the set thickness of the underground beam and the main body that resists earth pressure is provided.

[0012]

In the method of constructing a concrete foundation according to the first aspect of the present invention, first, only the hole for forming the footing portion is excavated on the ground surface with a rotating bucket or the like of an earth drill device. And
A mold with a double casing is provided in this hole, and only the outer shell portion of the footing portion provided with an opening for connecting the underground beam portion is formed. The outer shell also serves as an earth retaining material. Under the outer shell, the earth drilling method is used to deeply excavate, the reinforcing steel basket is inserted, concrete is placed, and a continuous earth drill pile is provided under the outer shell. In this case, remove the slime that emerges after placing the concrete and place the concrete up to the surplus in the outer shell to connect the earth drill pile to the outer shell only with concrete that does not contain slime. You can After that, after removing the formwork and obtaining the concrete strength of the outer shell, only the trench for forming the underground beam connecting the openings formed in the outer shell is opened in the ground, and the trench is underground. A beam forming mold is provided and concrete is continuously cast on the outer shell to form a footing portion and an underground beam portion continuous to the footing portion. In this case, the formwork for forming the underground girder is a waste formwork made of concrete panels, and the middle part of the formwork guide is an underground girder formwork guide that has resistance to earth pressure and rooting and weight. Connect to and support. In this way, all concrete foundations are provided in the ground from the beginning, so it is sufficient to excavate only the foundation portion and the slime disposal hole. In addition, since over-digging is not performed, deformation is prevented by the resistance force of each part of the mold even if earth pressure is applied.

According to another aspect of the present invention, there is provided a reinforcing bar continuous side opening form, which is used in a portion where the reinforcing bars of the footing portion are continuous and where the underground beam portion is connected to the footing portion. In this case, since the concrete is excluded within the range of the opening formwork by fitting the reinforcing bar insertion groove in the double casing so as to be closed, the concrete form is allowed to cure after the concrete is cured. By removing
The outer shell part is partially opened, and the reinforcing bar can be exposed in the opening part. This reinforcing bar may be cut when the underground beam is formed, and the reinforcing bar for the underground beam may be inserted into the outer shell portion of the footing.

In the frame for opening both ends of the reinforcing bar according to claim 3, the footing part is used for both ends of the reinforcing bar and is used at a place where the underground beam part is connected to the footing part. In this case, the opening can be formed in the outer shell by placing concrete in the double casing while avoiding the space between the pair of panels. The opening / closing port provided in the lower portion of the opening mold serves as a slime outflow hole when forming the earth drill pile portion. Further, when earth pressure acts after the casing is removed, the outer shell is prevented from being deformed by the resistance of the joint plate.

In the concrete foundation construction method of the fourth aspect, after the outer shell is formed, concrete is placed in the hole excavated below the outer shell. When this concrete is poured to the surplus part, slime rises at the top of the cast concrete after a certain period of time, but there is a slime disposal hole outside this formwork, so before the concrete hardens. The pile head can be treated by simply discarding it from below. In this way, the ground drill pile can be driven without delay after the footing outer shell is formed.

In the casing for the formwork of the footing part according to claim 5, the slime that floats up when the concrete for earth drill pile is placed is discharged from the lower part of the formwork of the footing part directly into the slime disposal hole. be able to. Further, even if earth pressure acts on the outer casing inserted in the footing portion forming hole, the pulling force is reduced by the friction resistance reducing material, so that the outer casing can be easily pulled out.

The underground beam form panel according to claim 6 can be easily assembled on site. Further, since it is made of concrete, it can be used as a waste formwork without waste by being integrated with the beam after placing concrete. Also, by connecting the connecting plate on the lower side and inserting the separator into the vertical guide rail, it is possible to easily assemble the underground beam part formwork on the ground,
The trench for forming the underground beam is very economical because it can be excavated with a width that allows the mold to be inserted. Further, after assembling the mold, pulling up the separator, after incorporating the reinforcing bar in this separator, it is possible to rebar the reinforcing bar in the mold by inserting the separator again along the guide rails, There is no need to provide a reinforcing bar scaffold.

In the separator according to the seventh aspect, the underground beam form panels can be held at the beam width of the underground beam simply by inserting the locking portion into the vertical guide rail. Further, in the case of a bar arrangement, it can be freely pulled out again. Further, since the separator holds the insides of the panels by holding them, the separator and the connecting plate of the panel synergize with the resistance to the compressive force, and even if the earth pressure acts from the outside, the separator is separated by a predetermined distance. Can be held.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a concrete foundation construction method of the present embodiment, FIG. 2 is an explanatory view showing an outer casing and an inner casing, FIG. 3 is a perspective view showing a reinforcing bar continuous side opening formwork, and FIG. FIG. 5 is a front view showing a mold for opening.
[Fig. 3] is a plan view showing the same attachment state as above.

First, the structure of the footing portion will be described.
The footing part formwork of the present embodiment mainly includes an outer casing 1, an inner casing 2, a reinforcing bar continuous side opening formwork 3, and a reinforcing bar both end side opening formwork 4.

The outer casing 1 and the inner casing 2 form an outer shell portion 5a of the footing portion 5, and as shown in FIG. The inner casing 2 is formed in a tapered shape having a slightly larger diameter in the lower portion and a slightly larger diameter in the upper portion. Further, in both cases, the through holes 6 are formed at the same height position below. A cushion material 7 is attached or sprayed to the outer peripheral surface of the outer casing 1 to reduce friction against earth pressure and facilitate removal. The cushion material may be one that is damaged during the removal of the casing, and a resin film, a foamed resin sheet, or the like can be used. A slinging member is appropriately attached to the upper ends of the outer casing 1 and the inner casing 2.

When forming the outer shell portion 5a of the footing portion 5, the reinforcing bar continuous opening mold 3 is provided with an opening portion 5b for integrally connecting the underground beam portion 11 to the outer shell portion 5a. The outer casing side block 9 and the inner casing side block 10 are provided, and the mating surface 9a of the outer casing side block 9 and the mating surface 10a of the inner casing side block 10 are used in a closed state. When the thickness is approximately the same as the distance between the outer casing 1 and the inner casing 2,
Further, its width is substantially the same as the width (thickness) of the underground beam portion 11,
Each of them is formed of polystyrene foam so that the height thereof is substantially the same as the height of the outer casing 1 and the inner casing 2. Further, a through hole 3a for discharging slime is formed in the lower part thereof. On the mating surfaces 9a and 10a,
It is provided with rebar insertion grooves 9b and 10b which form insertion holes for the rebar 12 when closed.

The mold 4 for opening both ends of the rebar is formed by preliminarily assembling the rebar into a cage shape and forming the outer shell.
An opening 5c for integrally connecting the underground beam portion 11 to the outer shell portion 5a is provided by using the fixing portions 4a at the start end side and the end end side of the reinforcing bar 12 inserted along the inside of the. Then, the joint plate 13 and the pair of damming panels 14, 14 are formed. The joint plate 13 has sufficient strength not to deform the footing outer shell portion against earth pressure, is arranged along the outer casing 1 and the inner casing 2, and is fixed to both ends of the reinforcing bar 12 in advance. The plate 12a is detachably fixed to both side edges with bolts 15. Further, an opening / closing port 13b which is opened / closed by an elevating lid 13a is opened in the lower part. In the figure, 13c is an upper limit stopper, and 13d is a reinforcing rib. The damming panel 14
Are erected so as to block the space between the outer casing 1 and the inner casing 2 so as to be substantially orthogonal to the joint plate 13 at both end positions of the joint plate 13. In addition, a vertical hole 14 is formed along the contact line of the joint plate 13.
a is opened at a predetermined pitch, and the gusset plate 12a of the reinforcing bar is inserted therethrough. FIG. 6 shows the rebar cage after assembly.

Next, the underground beam formwork will be described. The underground beam part formwork 18 of the present embodiment is configured so that the underground beam part formwork guide 16 is provided at an intermediate portion of the underground beam part connected to the footing parts. This underground beam formwork guide 1
Both 6 and the underground beam part formwork 18 use a precast concrete panel as a dam plate. Precast concrete panel 1 for the underground beam formwork guide 16
6a (see FIG. 1 (g)) and the precast concrete panel 18a of the underground beam form 18 (see FIG. 1 (d))
Is manufactured in advance in the field, and as shown in FIGS. 7 and 10, both are L-shaped joints 19a and T-shaped joints 19b that are integrally formed of plastic.
Has an outer frame 19 formed by connecting the square pipes 17 with
The outer frame 19 is appropriately laid out and then filled with concrete to form a panel.

On the lower side of the outer frame 19, as shown in FIG. 12, the precast concrete panels 16a or the precast concrete panels 18a are separated from each other by bolts so that the precast concrete panels 16a are approximately equal to the thickness of the underground beam 11. Connection plates 19c for fixing are provided at appropriate intervals. The connecting plates 19c are sandwiched by joint plates 19d from above and below and fixed by bolts 19e.

The L-shaped joint 19a and the T-shaped joint 19b are, as shown in FIGS. 13 and 14, respectively, the fitting portion 1 formed slightly smaller than the inner dimension of the square pipe 17.
It is formed by arranging 9f in an L shape or a T shape,
On its side, a pilot hole 1 to be screwed into the square pipe
9g has been opened. In the figure, 19h is a screw hole for screwing an eyebolt for lifting or connecting fitting 19i.
Is attached to connect the panels to each other.

The precast concrete panel 16
The precast concrete panels 16a or the precast concrete panels 18a are arranged to face each other on one surface side of the a and 18a, respectively, and the separators 20 framed in a panel shape or a rectangular shape are locked at the facing positions. A guide rail 20a is provided which is detachable by moving the portion 20d up and down from the upper end.
In FIG. 9, 20e is a panel attached to the separator 20 side, and 32 is a panel for adjusting the misalignment of the cylindrical casing 29.

As shown in FIG. 8, the separator 20 is provided with openings 20b in a plurality of stages. After the formwork is assembled, the separator 20 is pulled up so that the underground beam part formwork guide 16 and .. are arranged at the same pitch as the guide rails 20a, 20a ... In the underground beam part form 18, and then the reinforcing bars 20c are assembled by using the openings 20b. By inserting the separator 20 from above, the separator and the reinforcing bar can be arranged at the same time in the mold.

Next, a method of constructing a concrete foundation composed of an underground beam portion and a footing portion will be described with reference to FIG. First, as shown in FIG. 1A, the foot 8 is formed in the ground surface 8a with an earth drill, and the outer casing 1 is inserted. Then, while arranging the reinforcing bars 12 in a basket shape at a predetermined pitch on the ground in advance, as shown in FIG. 4, both end sides of the reinforcing bars 12 are arranged in the same row, and the gusset plate 1 fixed to the start side and the end side thereof
Each of the reinforcing bars 2a is inserted into the damming panel 14 of the frame 4 for opening both ends of the reinforcing bar, and then fixed to the joint plate 13 with bolts 15 to form a reinforcing bar basket. In this way, the form 4 for opening both ends of the reinforcing bar is provided so as to be arranged in the outer casing 1 (see FIG. 5).

Since the underground beam portion 11 is provided in a state orthogonal to the footing portion 5, the reinforcing bar continuous side opening formwork 3 is positioned at a right angle to the reinforcing bar both end side opening formwork 4 in the outer casing 1. It is provided so that In this case, the reinforcing bar 12 is closed so that the reinforcing bar 12 is fitted into the reinforcing bar insertion grooves 9b, 10b of the outer casing side block 9 and the inner casing side block 10 shown in FIG. 3, respectively. It is arranged so that it can be arranged in the casing 1. FIG. 6 shows its outer shape. And this rebar basket is shown in Fig. 1.
As shown in (b), the opening / closing port 13b of the joint plate 13
Is inserted into the outer casing 1 so that the holes coincide with the through holes 6 of the outer casing 1. After that, the inner casing 2 is made so that the through hole 6 is aligned with the opening / closing port 13b.
The mold 21 for forming the footing portion is provided by inserting the inside of the mold. In this case, the opening / closing port 13b is
It is closed by the lifting lid 13a. Further, when the opening / closing port 13b side cannot be used conveniently, the through hole 3a side of the reinforcing bar continuous side damming form can be used.

After the formwork 21 for forming the footing portion is provided, as shown in FIGS. 1 (c) and 1 (d), concrete is poured into the formwork and cured, and thereafter, the mold is almost the same as the inner casing 2. Excavate the lower part of the ground by drilling holes for earth drilling 22
To open. The casing 22 to be inserted during excavation
Sediment 22b is filled in the gap between a and the outer shell 5a.
Further, the side of the reinforcing bar continuous side damming form 3 is also excavated so as to be appropriately deeper than the footing part form 21, and a slime disposal hole 23 is opened.

After opening the hole 22 for punching the earth drill, as shown in FIG. 1 (e), the reinforcing bar basket 24 is inserted into the hole 22 for punching the earth drill, and concrete is poured. In this case, the concrete pouring is temporarily stopped at about 500 mm below the bottom of the footing portion, the bentonite liquid or the like is vacuumed, and then the extra portion is poured again. Since the slime 25 is floating on this extra portion, the elevating lid 13a is immediately opened, and the extra portion is caused to flow out to the lateral slime disposal hole 23 through the opening / closing port 13b and discarded. And this slime block is buried as it is. In the figure, reference numeral 26 is an air pipe for ejecting compressed air for promoting outflow. In this way, the ground drill pile 22c is formed.

After that, the outer casing 1, the inner casing 2, and the opening molds 3 and 4 are removed to obtain the structure shown in FIG.
As shown in (f), the outer shell portion 5a having the openings 5b and 5c is formed below the ground surface 8a. During a series of these operations, the outer shell resists earth pressure and doubles as earth retaining material.

After the outer shell 5a is provided at a predetermined position, the underground beam part frame guide forming hole 28 is provided at a position where the outer shells pass each other.
After the cylindrical casing 29 is inserted into the hole 28, a crusher run is inserted and the compaction is performed.
Insert 0. Then, as shown in FIG. 8, the pair of precast concrete panels 16a are connected to each other by the connecting plates 19c, and both ends thereof are connected to the separator 20.
To form a form unit 31, which is inserted into the cylindrical casing 29. Then, the precast concrete panels 16a are arranged so that the precast concrete panels 16a are parallel to the underground beam forming groove 27, and the cylindrical casing 2 is provided.
9 is closed with a panel 32, and then concrete is poured between the precast concrete panel 16a and the cylindrical casing 29 including the lower portion of the precast concrete panel 16a (see FIG. 9). By doing so, resistance to earth pressure is imparted.

Immediately after the concrete is poured, the cylindrical casing 29 is removed. By curing the concrete and then removing the separator 20, an underground beam part formwork guide 16 is formed below the ground surface 8a as shown in FIG. Then, as shown in FIG.
The outer shell part 5a of the footing part and the underground beam part form guide 1 are shown in a.
6. The outer shell 5a passing through the underground beam form guide 16
After excavating the underground beam forming groove 27 for communicating the openings of the above, as shown in FIG. 1 (R), FIG. 12, and FIG. 17, the connecting plates 19c are preliminarily connected to each other on the ground. The underground beam part formwork 18 formed by the concrete panels 18a, 18a is erected in the underground beam part forming groove 27, and base concrete is poured. Then, after the soil is backfilled, the reinforcing bar frame is assembled with the separators arranged at a predetermined pitch on the ground as described above, and then inserted into the underground beam part form 18. In this case, as shown in FIGS. 15 and 16, on both sides of the reinforcing bar, the footing outer shell 5a is formed.
Line up inside. By placing concrete from the inside of the underground beam form 18 to the inside of the outer shell 5a, as shown in FIG.
As shown in (g), a concrete foundation including the footing portion 5 and the underground beam portion 11 connecting the footing portions 5 to each other can be provided below the ground surface 8a.

As described above, in this embodiment, it is possible to construct a concrete foundation below the ground surface without excavating the ground surface other than the foundation forming portion and the slime disposal hole. Therefore, even if the site is small, it is not necessary to install earth stoppers, retaining walls, etc., and unnecessary dug work, soil carry-out, backfill work, etc. are unnecessary, and the construction period can be shortened and costs can be reduced. You can Further, since the earth pressure may act on the mold or the like because no over digging is performed, each part has a resistance to the earth pressure and can be prevented from being deformed. In addition, when forming the earth drill pile in the footing part, the part containing slime can be removed by a simple procedure immediately after placing the concrete, so no chipping work is required, which can shorten the construction period and reduce waste and noise pollution. You can build a concrete foundation without putting it out.

Further, the form 3 for opening the continuous reinforcing bar side is formed by combining the outer casing 1 and the inner casing 2 so as to connect the underground beam portion 11 to the outer shell portion 5a for forming the footing portion 5. The section 5b can be easily opened.

Further, in the form frame 4 for opening both ends of the reinforcing bar, the underground beam part 11 is connected to the outer shell part 5a for forming the footing part 5 by the combination of the outer casing 1 and the inner casing 2. The opening 5c can be easily provided. Further, the reinforcing bar can be held in a discontinuous state so that the reinforcing bar can be a complete opening that does not cross. Also, the footing part formwork 2
It is possible to remove slime and the like when forming the earth drill pile portion while it is mounted inside 1.

The embodiments of the present invention have been described above.
The specific configuration of the present invention is not limited to this embodiment, and even if there is a specific design change or the like, it is included in the present invention.

For example, in the embodiment, the outer casing 1 is provided with the flange portion 7, but the invention is not limited to this, and the shape of the attachment of the flange portion 7 and the like can be arbitrarily set. The shape of the inner casing 2 is also arbitrary.

The concrete shapes of the reinforcing bar continuous side damming form 3, the reinforcing bar end side damming form 4, etc. are arbitrary.

The L-type joint and the T-type joint may be made of any material, and may be made of metal. The shape may also be provided with a large number of reducing holes as shown in FIGS.

[0043]

As described above, in the method of constructing a concrete foundation according to claim 1 of the present invention, since the method is adopted, the ground surface other than the concrete foundation forming portion and the slime disposal hole is left over. It is possible to construct a concrete foundation below the ground surface without digging. Therefore, even if the site is small, it is not necessary to provide mountain retaining, and it is not necessary to carry out overburden work, carrying out soil, backfilling work, etc., which can shorten the construction period and reduce the cost. When forming the footing portion, the outer shell portion can also serve as a soil retaining member. In addition, when forming the earth drill pile under the footing part, the slime-containing part can be removed immediately after placing the concrete, so no need for chipping work for the ground drill pile head treatment, which can shorten the construction period and reduce noise pollution. The effect of being able to construct a concrete foundation without the need to put it out can be obtained.

In the frame for opening the reinforcing bar continuous portion according to the second aspect, because of the above-mentioned configuration, the outer shell portion for forming the footing portion is formed in the ground by the combination of the outer casing and the inner casing. An opening for connecting the beam portions can be easily opened. Further, it is possible to obtain the effect that slime and the like can be removed when the ground drill pile is formed with the footing portion mounted in the formwork.

According to the formwork for opening both ends of the reinforcing bar according to the third aspect of the present invention, since it has the above-mentioned configuration, the underground beam is formed in the outer shell portion for forming the footing portion by the combination of the outer casing and the inner casing. An opening for connecting the parts can be easily opened. Further, the reinforcing bar can be held in a discontinuous state so that the reinforcing bar can be a complete opening that does not cross. Even if the reinforcing bars are discontinuous, the joint plate resists earth pressure and prevents deformation. Further, it is possible to obtain the effect that slime and the like can be removed when the ground drill pile is formed with the footing portion mounted in the formwork.

In the concrete foundation construction method according to claim 4, since the method is adopted, when slime floats up in the footing part form, it is removed to the slime disposal hole before it hardens. Therefore, it is not necessary to suck up with a vacuum car that is difficult to clean after the fact. Further, since it is not necessary to carry out the hanging work, the construction period can be shortened by that much, and no waste or noise pollution is generated. The effect is obtained.

In the casing for the footing part formwork according to the fifth aspect of the present invention, since it has the above-mentioned structure, the footing part can be provided without needing to excavate. Further, it is possible to easily assemble, and it is possible to easily disengage even if earth pressure acts.

Since the underground beam form panel according to claim 6 has the above-mentioned structure, it can be assembled easily and accurately on site. Further, the form can be easily assembled on the ground, and it can be installed accurately in a short time in a groove that has not been dug.

In the separator according to the seventh aspect of the present invention, because of the above construction, it is possible to easily hold the underground beam portion form panels to the underground beam portion set thickness. Further, even if earth pressure is applied, it is possible to obtain an effect that the set width can be fixed without changing.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a concrete foundation construction method according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an outer casing and an inner casing of the embodiment.

FIG. 3 is a perspective view showing a form for opening a continuous reinforcing bar of an embodiment.

FIG. 4 is a front view showing a mounted state of the rebar both ends side opening formwork of the embodiment.

FIG. 5 is a plan view showing a mounting state of the rebar both ends side opening formwork of the embodiment.

FIG. 6 is a perspective view showing a reinforcing bar basket for a footing outer shell portion.

FIG. 7 is a front view showing a precast concrete panel for an underground beam part form guide of the embodiment.

FIG. 8 is a perspective view showing a formwork unit for an underground beam part formwork guide of an embodiment.

FIG. 9 is a plan view showing an assembled state of the underground beam form guide of the embodiment.

FIG. 10 is a front view showing a precast concrete panel of the formwork for forming an underground girder of the example.

FIG. 11 is a plan view showing an assembled state of the formwork for forming an underground beam portion of the embodiment.

FIG. 12 is an explanatory view showing a connection state of the connection plate of the precast concrete panel of the example.

FIG. 13 is a perspective view showing an L-shaped joint for connecting a square pipe of an embodiment.

FIG. 14 is a perspective view showing a T-joint for connecting a square pipe of an embodiment.

FIG. 15 is an explanatory view showing a reinforcing bar arrangement state of the footing portion and the underground beam portion of the embodiment.

FIG. 16 is an explanatory view showing a reinforcing bar arrangement state of the footing portion and the underground beam portion of the embodiment.

FIG. 17 is an explanatory diagram showing a work procedure of the underground beam portion of the embodiment.

FIG. 18 is a perspective view showing an L-shaped joint for connecting a square pipe of another embodiment.

FIG. 19 is a perspective view showing a T-joint for connecting a square pipe of another embodiment.

[Explanation of symbols]

 1 Outer casing 2 Inner casing 3 Reinforcing bar continuous side opening form frame 4 Reinforcing bar both end side opening form frame 5 Footing part 5a Outer shell part of footing part 6 Through hole provided inside and below outer casing 8 Hole for forming footing part 8a Ground surface 9 Outer casing side block of rebar continuous side opening formwork 9b Rebar insertion groove of rebar continuous side opening formwork 9c Reinforcement continuous side opening formwork through hole 10 Rebar continuous side opening formwork inner casing Side block 10b Reinforcing rod insertion groove of form for continuous reinforcing bar opening 10c Through hole of form for continuous reinforcing bar opening 11 Underground beam part 12 Reinforcing bar 13 Reinforcing bar joint plate for opening both ends of reinforcing bar 13b Opening / closing port 14 Rebar both ends Weir panel for formwork for opening 16 Underground beam part formwork guide 16a Concrete panel for underground beam part formwork guide 18 Underground beam part forming formwork 18a Underground beam part forming formwork Concrete panel 19a Square pipe L-shaped joint 21 Footing part formwork 22 Pile driving hole 22c Earth drill pile 23 Slime disposal hole 24 Reinforcing bar basket 25 Slime 27 Underground beam part forming groove 28 Underground beam part Forming guide Hole 29 Cylindrical casing for forming the underground beam form guide

Claims (7)

[Claims] 1. A weir for concrete is prepared in advance with a width such that holes for forming a footing portion are opened on the ground surface at a predetermined interval by an earth drill to insert an outer casing, and then an underground beam portion is continuously connected to the inside of the footing portion. A basket-shaped rebar with a frame for opening attached to the rebar to stop and open the opening is arranged along the inner surface side of the outer casing, and the inner casing is inserted inside the rebar and the frame for opening. Forming a footing part formwork with a double casing, and then placing concrete in the footing part formwork to form an outer shell part of the footing part which also serves as a soil retaining for the footing part forming hole, After forming the outer shell portion, a pile driving hole is opened downward from inside the outer shell portion by an earth drilling method, a reinforcing steel basket is inserted and concrete is poured, and concrete is poured to the pile driving hole to an excessive amount. Setting After forming the earth drill pile that is continuous with the lower part of the outer shell by removing the slime that floats in the outer shell, after forming this earth drill pile, the earth drill casing and the inner and outer casings are removed, and the ground surface And the cylindrical casing is inserted by providing a hole for forming the underground girder formwork guide with an earth drill at a position where the outer shells pass each other, and the beam width of the underground girder is defined by using a concrete panel as a weir plate. Provided and erected in the cylindrical casing, concrete was placed between the cylindrical casing and a panel made of concrete to form an underground beam formwork guide for the panel made of concrete to resist earth pressure. The rear cylindrical casing is removed, a groove for forming an underground beam is formed on the ground surface between the outer shell and the form guide for the underground beam, and the grooves for forming the underground beam are formed on both sides of the groove. The underground beam part formwork is formed by connecting the underground beam part formwork panel by a erection and connecting it to the underground beam part formwork guide. A method for constructing a concrete foundation, which comprises arranging continuous reinforcing bars in and out of a section and then placing concrete to form an underground beam section and a footing section. 2. A mold for opening used in a continuous portion of a reinforcing bar for a footing part in the concrete foundation construction method according to claim 1, which is substantially the same as an underground girder part that is integrally connected to the inside of the footing part. It has a width and a thickness for damming the inside of the double casing, and is formed in a two-part shape with a foamed resin material, and a through hole for discharging slime is formed in the lower part, and the mating surface sides are connected to each other. Is a formwork for continuous opening of the reinforcing bar, characterized by having a reinforcing bar insertion groove. 3. An opening formwork used for the both end gathering portions of the reinforcing bar for the footing part in the concrete foundation construction method according to claim 1, wherein the beam of the underground girder part is integrally connected to the inside of the footing part. A pair of panels that block the inside of the double casing with a width, and a space between the panels is closed and both ends of the reinforcing bar are detachably fixed between the panels to prevent earth pressure of the footing shell after the casing is removed. A formwork for opening both ends of a reinforcing bar, which has resistance and a joint plate having an opening / closing opening at a lower portion. 4. The method for constructing a concrete foundation according to claim 1, wherein a communication port from the inner casing to the outer casing is provided in the lower part of the footing part formwork, and after the earth drill pile is driven, the outside is provided while the slime rises. A slime disposal hole is opened next to the shell part by the earth drill method, and the floating slime is allowed to flow down to the slime disposal hole through the communication port, thereby removing the slime outside the footing part formwork. Concrete foundation construction method. 5. A through hole for slime discharge is provided in the lower part of the outer casing and the inner casing for the footing part formwork used in the concrete foundation construction method according to claim 1, and the outer surface of the outer casing is provided. The footing part formwork casing according to claim 1, further comprising a frictional force reducing material for reducing earth pressure. 6. An underground beam formwork panel used in the concrete foundation construction method according to claim 1, wherein an outer frame part of the panel is a square pipe, and a fitting part is an end part of the square pipes. It is formed by an L-type joint and a T-type joint that are fixed in a state where the square pipes are orthogonal to each other by inserting it into the outer frame portion of the square pipes filled with concrete to form a panel shape. A vertical guide rail that locks the separator is provided at the facing position on the inner surface side with the panels facing each other, and the lower sides are connected to each other to withstand the earth pressure during backfilling and the underground beam section. The underground beam formwork panel according to claim 1, further comprising a connection plate for holding the set thickness of the above. 7. A separator used in the panel for an underground girder part according to claim 6, wherein the separator is inserted from above the vertical guide rail and both sides are locked to the vertical guide rail. The separator according to claim 6, further comprising a stop portion and a main body portion for holding the underground beam portion formwork panels at a set thickness of the underground beam portion and resisting earth pressure.