JP2804422B2 - Foundation construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a foundation for a large-scale building using a dies for integrally molding concrete. More specifically, the present invention relates to a safety method and an improvement relating to a soil cutting process in which a root trench is dug in a construction method for constructing a foundation without a basement in a root trench ditched in the ground.

[0002]

2. Description of the Related Art Conventionally, as a method for constructing a foundation of a large-scale building having no basement, for example, a trench is dug in the ground in the entire construction area, and a split stone is laid at the bottom of the trench. It is known that a concrete form is built in a root cutting groove after a concrete is compacted by rolling the concrete, and then concrete is integrally cast by arranging a reinforcement inside the formwork. After the cast concrete has hardened,
The formwork will be dismantled and backfilled around the concrete foundation.

In this conventional method for constructing a foundation, since a root cutting groove is dug in the entire area of the construction area and a large amount of soil is removed, the soil is removed from the construction area without being held in the construction area. As a result, the earth and sand that bury the surroundings of the foundation is newly transported into the construction area. The amount of soil removal is calculated as root cutting groove depth x root cutting groove width x floor area.

[0004]

In the above-mentioned conventional method for constructing a foundation, in the entire area of the construction area, the excavated root cutting grooves are opened without being backfilled until the formwork is dismantled and removed. ing. Therefore, work scaffolds, work passages, etc. for preventing fall of the formwork, rebar arrangement workers, etc., must be erected in the root cutting grooves, and construction costs are increased by erection of the work scaffolds, work passages, etc. There is a problem that the period is long. Furthermore, even if a work scaffold, a work passage, or the like is erected, the state in which the root groove is opened does not change.
There is a problem that the danger of work still remains. Furthermore, there is a problem that the construction cost is increased and the construction period is lengthened even by carrying out a large amount of excavated soil and carrying backfilled earth and sand.

Japanese Patent Application Laid-Open No. Hei 5-17955 discloses that a trench is dug in a whole area of a construction area, a mold is formed in the trench, and the periphery of the mold is backfilled. A law is disclosed. According to this construction method, until the disposable formwork is built in the entire area of the construction area, the disposable formwork and the surrounding area are still open, and the danger of work has not been solved yet.

[0006] In Japanese Patent Application Laid-Open No. 4-272319, a foundation is installed in a digging trench and backfilling is performed.
A basic construction method which repeats this one by one is disclosed. However, this foundation construction method is to build a precast concrete itself having a T-shaped portion as a foundation stone as a foundation stone, and does not disclose any construction of a formwork for casting concrete. No suggestion is made regarding the construction of abandoned formwork. In other words, the base precast concrete has already been molded outside the construction site, so there is no need to bring the formwork, reinforcing steel, etc. to the construction site for concrete casting. In this case, a formwork, a reinforcing bar, or the like is in the way, and there is no room for considering the timing of assembling, building, or arranging the formwork.

[0007] Further, the digging groove of the root cutting groove is designed according to the size of the foundation stone of the precast concrete, and does not take into account the dimensions of assembling and building the formwork. . Therefore, when the digging groove of the root cutting groove is repeated, it is merely performed as the foundation stone itself of the precast concrete, and the digging groove for the formwork and the sequential repetition thereof are not performed at all. Furthermore, the backfilling of root cutting grooves is also performed directly on the foundation stone itself of precast concrete, and there is no disclosure of backfilling the shavings sequentially on the formwork.

[0008] In fact, precast concrete is not suitable as a foundation stone because of its weakness against loads and the like. However, if it is applied to a small house as a foundation stone, it is only necessary to dig a groove as the foundation dimension. A shallow and narrow groove size is sufficient. Generally, the maximum width is 80 cm and the depth is 50
cm × construction area is enough, so it can be piled up on site without a large amount of soil removal.In this kind of small house, when concrete is cast at once to form a foundation Did not carry the excavated soil.

Furthermore, in the basic construction method disclosed in Japanese Patent Application Laid-Open No. 4-272319, each precast concrete is connected by concrete casting with a formwork fixed to the outside of the connection gap, so that it can withstand a large load. It is irrelevant to the technique of using a formwork for arranging concrete in one by continuously arranging reinforcing bars. It is recognized that this foundation construction method cannot be used for large-scale buildings.

[0010] The present invention has been made in view of such problems, and an object of the present invention is to provide a method of constructing a foundation in which the state in which a root groove is opened is shortened by effectively using earth removal. And

[0011]

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, a root cutting groove formed of a plurality of independent foundation portions and an underground beam portion disposed between the independent foundation portions and communicating with the independent foundation portion is provided on the ground of one section of the construction area. The trench was dug and built into the root trench of one section, and the built-in formwork for the independent foundation and the underground beam was buried. In the same way, another trench adjacent to or adjacent to the other section shall be buried in the trench of the root groove, and the formwork shall be erected. Backfilled around the discarded formwork and processed in the yard,
The construction of such trenches and digging forms of the root ditches and the in-plant treatment by backfilling the digging form around the digging form of the section before the excavation will be carried out for each section one after another. The remaining soil from the excavation will be buried around the scrapping frame of the last remaining section and processed in the plant.

[0013]

According to the above-mentioned means, in the construction area, a root cutting groove formed of an independent foundation portion and an underground beam portion which is adjacent to or adjacent to each other is opened, and the periphery of the discarded form opened in the previous section is opened. The grooving of the root kerf of the later section is simultaneously back-filled with the excavation groove of the kerf of the later section. For this reason, the excavated soil is transported by an adjacent distance or an approaching distance, and the state where the root cutting groove is opened is shortened by effectively utilizing the soil in each section. A section of root kerfs,
After the construction of the discarded formwork, no rebar construction work will be performed, so the construction of the root cutting groove and the discarded formwork will be performed immediately.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for constructing a foundation according to the present invention will be described below with reference to the drawings.

In this embodiment, the construction area G is constructed by dividing the construction area into a number of rectangular sections.

First, as shown in FIGS. 1 and 2, a root cutting groove 1 is dug only in one section A of a construction area G. That is, the root cutting groove 1 is opened only in a part of the ground in the construction area G.

The root cutting groove 1 includes a plurality of square independent foundations 10 arranged at regular intervals, and an independent foundation 10
And a rectangular underground beam portion 11 disposed in communication with the independent foundation portion 10. An earth retaining process or the like is applied to the root cutting groove 1 if necessary, and a root cutting work is performed in which a split stone is laid at the bottom, compacted, and discarded concrete 12 is poured thereon. However, regarding the underground beam portion 11, at least the casting of the discarded concrete 12 is unnecessary because of the structure of the discarded frame 4 for the underground beam described later. The excavated soil obtained by digging the root cutting groove 1 is carried out from the construction area G.

Then, as shown in FIG. 3 and FIG. 4, a dump frame 2 for placing concrete for constructing a foundation is installed in the root cutting groove 1 where the root cutting work has been performed.

The discarded frame 2 is buried inside the root cutting groove 1 and does not need to be dismantled and removed.
Accordingly, the structure of the scrap frame 2 can be considerably simplified. In addition, the discarded formwork 2 is formed by uniting a discarded formwork 3 for an independent foundation built in the independent foundation section 10 and a discarded formwork 4 for an underground beam built in the underground beam section 11. Then, after the dismountable formwork 3 for the independent foundation is installed on the independent foundation portion 10, the disposable formwork 4 for the underground beam is installed on the underground beam portion 11, and the disposable formwork 3 for the independent foundation is dismantled. The frame 4 is connected and connected by an appropriate means. Therefore, it is possible to adopt a construction method in which the discarded formwork 3 for the independent foundation and the discarded formwork 4 for the underground beam are respectively pre-assembled outside the root cutting groove 1 and dropped into the root cutting groove 1 for installation. In addition, the amount of surplus digging of the root groove 1 can be reduced.

Next, as shown in FIGS. 5 and 6, the root cutting groove 1 is also connected to the adjacent section B to form a trench. Then, the excavated soil B 'of the trench is buried around the discarded frame 2 of the section A, and the in-plant processing is performed. At this time, the excavation of the surrounding area of the shaving frame 2 of the previous section A is performed by the excavation B 'simultaneously with the excavation groove of the root cutting groove 1 of the section B without temporarily depositing the excavation B'. . That is, the root cutting groove 1 is opened only in the adjacent one section B instead of the one section A ahead of the construction area G.

The remaining soil of the excavated soil B 'obtained by digging the root trench 1 is deposited near the section B or in an appropriate place in the construction area G and reserved.

Further, as in the case of the section A, the discarded formwork 2 is erected in the section B. Then, in-situ processing is performed by backfilling the moat of the root cutting groove 1 of the next section C and the periphery of the scrapping frame 2 of the section B ahead of it. This backfilling is performed by the remaining soil of the excavated soil B ′ reserved near the section B and the excavated soil of the section C.

In this way, the in-plant processing by backfilling around the disposal form 2 of the last section is performed by the remaining soil of the excavated soil reserved near the section.

After the in-plant treatment by backfilling around the discarded frame 2 of the last section, concrete is placed inside the discarded frame 2 by arranging reinforcing bars or the like. At this time, reinforcing work is performed internally in the independent foundation 10,
In the underground girder formwork 4, the reinforcing bars assembled on the ground with a continuous length are dropped into the underground girder formwork 4 having no work scaffolds, work passages and the like, and are arranged. It is not necessary to dismantle and remove the scrap frame 2 after the concrete is cast.

According to such an embodiment, during the construction, the root cutting groove 1 forms one of the sections A, B, C,.
Since only the openings are provided at the holes, there is a very low risk that the formwork, the reinforcement arranging worker, etc. may fall down to the root cutting groove 1 by mistake. Therefore, it is not necessary to install a work scaffold, a work passage, and the like, and the construction cost is reduced and the construction period is shortened.

Further, as for the excavation of the root cutting groove 1, the excavation of only the first section A may be carried out of the construction area G, and the excavation of the subsequent sections B, C,. It is no longer necessary to bury the material in the area 2 and use it effectively to process it inside the site and carry it out of the construction area G. In addition, there is no need to carry backfilled earth and sand around the disposal form 2 into the construction area G. Also,
By the unitization of the discarding formwork 2 and adopting the dropping method,
Excavation amount of root cutting groove 1 is 500 to 1200 m on one side.
from 50 m to 350 mm. Therefore,
From this point, the construction cost is reduced and the construction period is shortened. In addition, since the carrying-out and carrying-in become unnecessary, the traffic of the carrying-out and carrying-in vehicles can be eliminated, thereby contributing to a reduction in traffic volume and a reduction in environmental pollution.

[0027]

As described above, according to the method of constructing a foundation according to the present invention, a waste form is erected in a root cutting groove which is opened in each section of the working area, and the soil removal of the subsequent root cutting groove is performed one after another. Since it was conveyed a distance adjacent to or close to and was buried around the discarded formwork of the previous section and processed in the field, the state in which the root groove was opened could be shortened. As a result, the danger of workers falling into the grooving ditches is reduced and the safety of construction is increased. In addition, there is no need to construct work scaffolds, work passages, etc. The construction period can be shortened by collective bar arrangement work in the area, and the effect of contributing to alleviation of traffic volume and reduction of environmental pollution is eliminated because there is no need to carry out excavated soil and carry-in vehicles. is there.

Further, according to the method of constructing a foundation according to the present invention, discarded frames for the independent foundation and the underground beam are erected in the root trenches of the independent foundation and the underground beam, and are adjacent to or adjacent to this. The excavated soil of the later root cuts could be buried one after another around the former formwork, thereby realizing the continuous backfilling of the formwork. In particular, since concrete can be cast integrally by continuously arranging the inside of the formwork by continuous backfilling, a solid large foundation can be provided, and it can be optimally applied to the foundation of a large building It is.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first step of an embodiment of a foundation construction method according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 showing a step that follows the step of FIG. 1;

FIG. 3 is a sectional view of FIG. 1 showing a step following FIG. 2;

FIG. 4 is a cross-sectional view of FIG. 1 showing a step subsequent to FIG. 3;

FIG. 5 is a sectional view of FIG. 1 showing a step following FIG. 4;

FIG. 6 is a plan view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Root ditches 10 Independent foundation part 11 Underground beam part 2 Disposable formwork 3 Disposable formwork for independent foundation 4 Disposable formwork for underground beams A, B, C Section G Construction area

Claims (1)

(57) [Claims] 1. An underground trench formed by a plurality of independent foundation portions and an underground beam portion disposed between the independent foundation portions in communication with the independent foundation portion on the ground of one section of the construction area. Then, in one section of the root trench, a built-in form for the independent foundation and an underground beam that will be buried and buried is built, and no rebar work is performed inside the built-in form. In the same manner, dig trenches and digging forms for root cuts in another adjacent or adjacent section, and cut off the previous section while digging the soil from the trenches for root cuts in another section. It is buried around the formwork and treated in the yard. This is a method of constructing a foundation that is implemented one after another on a parcel and reclaims the remaining soil from the excavated soil around the discarded formwork of the parcel left at the end of the construction area.