JP2002356857A - Foundation constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation constructing method which allows setting of a permanent form in an excavated groove without pouring oversite concrete, to thereby dispense with overbreak of the excavated groove. SOLUTION: The foundation constructing method is carried out by setting the assembled permanent form in the excavated groove in a manner lifting it down from above. According to the method, a plurality of base plates for partially bearing the permanent form, are set on crushed stones laid in the excavated groove, and then the permanent form is set on the base plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention belongs to the technical field related to a method of constructing a foundation using a discarded formwork.

[0002]

2. Description of the Related Art Generally, in the construction of a large-scale building foundation in which an underground space such as a basement is not constructed (the foundation is buried in the ground), in order to shorten the construction period, etc., the mold is removed after the concrete is cast. It has been practiced to use a discarded frame made of metal or the like that is not to be buried.

Conventionally, as a method of constructing a foundation using a discarded formwork, for example, the method shown in FIGS. 8 to 10 is known.

FIG. 8A shows a conventional construction method of a foundation.
As shown in FIG. 8 (C), a root kerf 1 is excavated from the surface of the ground, and as shown in FIG. After the concrete 3 is cast on the crushed stone 2 and the concrete 3 is cured and ink-marked, the mold 4 is placed on the concrete 3 as shown in FIG. The waste concrete 3 is formed as a horizontal installation surface for installation of the waste form 4. The discarded formwork 4 is assembled outside the root groove 1 and dropped from above the root groove 1.

[0005] After that, earth and sand are buried around the scraping frame 4 of the root cutting groove 1 and reinforcing steel is arranged inside the scraping frame 4 and then concrete is poured.

In this conventional method for constructing a foundation, as shown in FIG. 9, even if earth and sand (especially, topsoil) collapses on the discarded concrete 3 during the curing period, up to the position where the discarded formwork 4 is installed. An excavation S is secured when excavating the root cutting groove 1 so that sediment does not accumulate. As shown in FIG. 10, the surplus moat S also functions as a work space for the worker 5 arranged inside the root cutting groove 1 at the time of dropping and setting the discarded frame 4.

[0007]

According to the above-mentioned conventional method of constructing a foundation, since the sculpture form 4 cannot be installed in the root cutting groove 1 without the curing period of the slab concrete 3, the sculpture form 4 There is a problem that each process subsequent to the installation of the above is sequentially delayed, and the construction period becomes longer. In addition, root cutting groove 1
In order to increase the handling cost, such as excavation and backfilling of earth and sand, the construction cost increases.

The present invention has been made in consideration of the above problems, and allows a scrapping form to be installed without casting concrete in the trench, thereby making it possible to remove an overhang of the trench. It is an object to provide a method of constructing a foundation that can be made unnecessary.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, a method for constructing a foundation according to the present invention employs the following means.

That is, according to the first aspect of the present invention, in a method of constructing a foundation in which a cut-out form assembled in an excavated root-cut is dropped from above and installed, a cast-out form is placed on crushed stone laid in the root-cut. A plurality of baseplates that partially receive the frame, and a discarding frame is set on the baseplate.

[0011] In this means, the base plate installed on the crushed stone laid in the root cutting groove forms a horizontal installation surface for installation of the scrap frame. In addition, the formwork installed before the casting of concrete will serve as a stop for the collapsed earth and sand.

According to a second aspect of the present invention, in the method of constructing the foundation according to the first aspect, the base plate is installed at a position corresponding to a corner of the discarded formwork.

[0013] In this means, the base plate also serves as a mark (inking) for setting the discarded frame.

According to a third aspect of the present invention, in the method for constructing a foundation according to the first or second aspect, after the disposing form is set, the disposing concrete is cast only on the crushed stone surrounded by the disposing form. Features.

[0015] In this method, concrete for arranging reinforcing bars or the like is cast only on crushed stone surrounded by a mold.

According to a fourth aspect of the present invention, in the method for constructing a foundation according to the third aspect, after setting up the crushed stones in all of the root cutting grooves in the construction area, the crushed stone is surrounded by the crushed stones. The method is characterized in that concrete is poured simultaneously or continuously.

[0017] In this means, the waste concrete is poured simultaneously or continuously in all the kerfs in the construction area.

According to a fifth aspect of the present invention, in the method for constructing a foundation according to any one of the first to fourth aspects, the earth and sand excavated in one root cutting groove in the construction area is already installed in the construction area as it is. It is characterized in that it is buried in another root kerf.

In this means, the earth and sand excavated from the root cutting groove are used for backfilling another root cutting groove without being accumulated.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for constructing a foundation according to the present invention will be described with reference to FIGS.

This embodiment shows the construction of a foundation consisting of rectangular independent foundations.

In this embodiment, first, a root cutting groove 1 is excavated from the surface of the ground, and crushed stone 2 is laid and rolled at the bottom of the root cutting groove 1 (see FIG. 8 (A) and FIG. B)).

As shown in FIG. 2, an excavation work machine 6 such as a backhoe is used to cut the root kerf 1 in the above-mentioned conventional moat S.
Is excavated to the volume where the part corresponding to is removed. Therefore,
Since the amount of excavated earth 7 excavated in the root cutting groove 1 is reduced as compared with the above-described conventional example, the quantity of the excavated earth 7 is reduced and the construction cost is reduced. The excavated earth and sand 7 is buried back around the already-discarded formwork 4 of another excavated groove 1 previously excavated in the construction area by turning the excavator 6 or the like. . Therefore, it is not necessary to carry out a large amount of excavated earth and sand 7 outside the construction area or to accumulate a large amount within the construction area.
Accumulation is required. ) Therefore, complicated handling of the earth and sand 7 is reduced, and the construction cost is reduced.

Next, as shown in FIG.
A base plate 8 that partially receives the scrap frame 4 is placed on the base plate.

The base plate 8 is made of a flat concrete plate or the like which does not need to be cured, and four base plates 8 are provided corresponding to the discarded frame 4 having a square bottom. These four base plates 8 are shown in FIG.
As shown in the figure, a transit 9a using a laser beam or the like.
And by measuring the level 9b, they are horizontally installed on the same plane horizontally at positions corresponding to the corners of the discarded frame 4 or the outer peripheral portions of the discarded frame 4, and form a horizontal installation surface on which the discarded frame 4 is placed. . That is, the base plate 8 is substituted for the above-mentioned conventional waste concrete 3.

Next, as shown in FIG.
The disposable form frame 4 assembled above is suspended by a crane 10 and dropped from above to be installed.

The setting of the scrap frame 4 is carried out immediately after the setting of the base plate 8 because no curing is required for the base plate 8. Accordingly, since it is not necessary to secure a curing period for the waste concrete 3 before the installation of the waste mold frame 4 as in the above-described conventional example, each process subsequent to the installation of the waste mold frame 4 is not sequentially delayed. The construction period is shortened. As shown in FIG. 4, when the discarded formwork 4 is dropped into the root cutting groove 1, the base plate 8 and the edge of the root cutting groove 1 having no surplus S are not expanded unnecessarily. Mark M
Function as Therefore, the disposal frame 4 can be accurately dropped without arranging the worker 5 inside the root cutting groove 1, and the safety of construction is ensured. Destroyed formwork 4 installed
Serves as a barrier to the collapsing earth and sand 7 and prevents the collapsing earth and sand 7 from accumulating inside. Therefore, there is no inconvenience even if there is no surplus S in the root cutting groove 1.

Further, as shown in FIG. 5, after the scrap frame 4 is hung on the base plate 8 by the crane 10 and set down from above, the transit 9c of the scrap frame 4 installed on the base plate 8 and The measurement of level 9d is performed. This is because after the disposable formwork 4 is installed, the influence of the weight of the disposable formwork 4 and the installation position of the disposable formwork 4 are checked for deviations. This is for making the installation position of the frame 4 more precise.

Next, as shown in FIG. 1 (C), earth and sand 7 are buried around the cut-out form 4 of the root cutting groove 1.

The backfill of the earth and sand 7 uses the earth and sand 7 from which the root cutting groove 1 has been excavated as described above. When the earth and sand 7 are buried back, unnecessary grooves around the disposal form 4 disappear, so that the worker 5 moving in the construction area can be prevented from falling down, and the safety of construction can be secured. The backfilled earth and sand 7 enhances the pressure resistance of the scrap frame 4 into which concrete is cast and filled.

Next, as shown in FIG. 1 (D), the concrete 3 is cast only on the crushed stone 2 surrounded by the mold 4.

The waste concrete 3 forms an installation surface for arranging reinforcing bars and the like. As shown in FIG. 6, the worker 5 placing the waste concrete 3 is surrounded by the waste mold frame 4 and protected from the collapse of the earth and sand 7. Therefore, safety of construction is ensured. In addition, in order to cast discarded concrete 3,
As shown in FIG. 7, it is preferable to supply the waste concrete material with a hose 12 from a common or plural sources 11 and to carry out simultaneously or continuously in all the root cuts 1 in the construction area. . Simultaneous and continuous execution of the dumping concrete 3 facilitates the work of cleaning the leaked concrete material and the work of clearing the supply source 11, the hose 12, and the like.

After that, after the concrete 3 is cured, reinforcing steel is arranged inside the mold 4 and then concrete is poured.

The curing of the discarded concrete 3 is performed after the completion of the work by the large-sized machine such as the excavator 6 and the crane 10, so that there is no delay in the entire construction.

As described above, in addition to the illustrated embodiment, the present invention can be applied to the construction of a foundation composed of underground beams constructed between independent foundations.

Further, the base plate 8 can be driven into the crushed stone 2 and fixed.

[0037]

As described above, in the method for constructing a foundation according to the present invention, the base plate set on the crushed stone laid in the root cutting groove is used for the horizontal setting surface for setting the discarded formwork. Since it is formed, there is an effect that it is possible to install a waste formwork without placing concrete in a root cutting groove. In addition, by this effect, each step subsequent to the installation of the scrap frame is not delayed in order, and the effect of shortening the construction period is produced.

Further, since the waste form set before placing the waste concrete serves as a stop for the collapsing earth and sand,
This has the effect of eliminating the need for a trench in the root groove. In addition, due to this effect, the amount of handling such as excavation and backfilling of earth and sand is reduced, so that there is an effect that the construction cost is reduced.

[Brief description of the drawings]

FIG. 1 is a process diagram showing an embodiment of a foundation construction method according to the present invention, in which the order of steps is shown in the order of (A) to (D).

FIG. 2 is a cross-sectional view showing a link between a step preceding FIG. 1 and a step shown in FIG.

FIG. 3 is a detailed view of the process of FIG. 1A, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view.

FIG. 4 is a detailed view of the step of FIG. 1 (B).

FIG. 5 is a detailed view of the step of FIG. 1B, wherein FIG. 5A is a plan view and FIG. 5B is a cross-sectional view.

FIG. 6 is a detailed view of the step of FIG. 1 (D).

FIG. 7 is a detailed view showing a link between the steps in FIG. 1 (D).

FIGS. 8A to 8D are process diagrams showing a conventional example, and FIGS.
Are shown in the order of steps.

FIG. 9 is a detailed view of the step of FIG. 7 (C).

FIG. 10 is a detailed view of the step in FIG. 7 (D).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Root ditches 2 Crushed stone 3 Discarded concrete 4 Discarded formwork 7 Earth and sand 8 Base plate

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[Procedure amendment]

[Submission date] June 8, 2001 (2001.6.8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 7

FIG. 4

FIG. 5

FIG. 6

FIG. 9

FIG. 10

FIG. 8

Claims (5)

[Claims] 1. A method for constructing a foundation in which a discarded form frame assembled in an excavated root kerf is dropped from above and installed.
A method for constructing a foundation, comprising installing a plurality of base plates partially receiving a discarded formwork on crushed stone laid in a root cutting groove, and installing the discarded formwork on the baseplate. 2. The method according to claim 1, wherein the base plate is installed at a position corresponding to a corner of the scrap frame. 3. A method for constructing a foundation according to claim 1 or 2, wherein after the disposing form is set, the concrete is cast only on the crushed stone surrounded by the disposing form. Construction method. 4. The method for constructing a foundation according to claim 3, wherein after setting a scrapping form in all the root cutting grooves in the construction area, simultaneously discarding concrete on the crushed stone surrounded by the scrapping forms. Or a continuous casting method. 5. The method for constructing a foundation according to any one of claims 1 to 4, wherein the earth and sand excavated from one of the root cutting grooves in the construction area is directly used as the other roots in the construction area, on which the cut-off forms have already been installed. A method for constructing a foundation characterized by being buried in a kerf.