JPH04120316A - Assembly type simple caisson and landslide protection construction method - Google Patents

Abstract

PURPOSE:To effectively use a lot by jointing a plurality of caissons having freely detachable form panels outside and gap sections for filling landslide protection concrete, settling the caissons into the lot and filling the gap sections with landslide protection concrete. CONSTITUTION:A plurality of caissons 1 having freely detachable form panels 1b outside are jointed, and caisson wall bodies 2 are laid near the boundaries of the caissons 1. Edge form sections 1e are formed on the lowermost form panel 1b for facilitating the settlement of the caissons 1. Thereafter, sediments within the grounding section of the caisson wall bodies 2 are excavated, and the caisson unit 1 is pertinently added for settlement to the predetermined depth with the own weight thereof. In addition, gap sections 1c are filled with landslide protection concrete, and the form panels 1b are drawn out before the concrete cures. The aforesaid process is repeated and the caisson wall bodies 2 are combined to form a caisson A, and a landslide protection continuous wall is formed on the periphery thereof. According to the aforesaid construction, the space of the lot can be effectively used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simple prefabricated caisson and earth retaining method used for basement construction and the like.

[Conventional technology]

Conventionally, when constructing a basement, a steel plate was first driven into the soil using an auger to secure the earth, and then the earth and sand were excavated to form a concrete frame.

[Problem to be solved by the invention]

However, with such conventional technology, it is not possible to install steel plates at the very edge of the border with the adjacent land, and the concrete frame work for the basement must be done at a certain distance from the steel plates, so - It is necessary to excavate a large area around the area, which makes it impossible to construct a basement close to the border with the adjacent land, and the press-fitting of steel plates has a negative impact on the ground of the adjacent land. There was a problem of having to secure the

The present invention has been made in view of this point, and its purpose is to enable excavation along the basement installation area so that the basement can be constructed close to the border with the adjacent land, and To provide a simple prefabricated caisson and earth retaining method that does not adversely affect the ground of adjacent land and does not require the introduction of an auger.

[Means to solve the problem]

In order to achieve the above object, the present invention was constructed as follows. That is, in the prefabricated simple caisson of claim I, a form panel is detachably attached to the outer surface of the frame body, and a gap for pouring earth retaining concrete is provided between the outer surface of the frame body and the form panel. A caisson unit is formed by forming a section, a caisson wall is formed by vertically connecting a plurality of the caisson units, and a plurality of the caisson walls are combined into a cylindrical shape. be.

Further, in the earth retaining method of claim 2, a form panel is detachably attached to the outer surface of the frame, and a gap for pouring earth retaining concrete is provided between the outer surface of the frame and the form panel. Using a single caisson with a section formed, a plurality of the above caisson units are connected vertically to form a caisson wall, and the earth and sand in the ground contact part of this caisson wall is excavated and the caisson wall is moved to a predetermined position by its own weight. By sinking to a deep depth, a plurality of the caisson walls are combined into a cylindrical shape in the soil, while retaining concrete is poured into the gap on the outside of the caisson walls that have sunk, and only the formwork panels are removed. Pull it out of the soil, then
After the earth retaining concrete has developed a predetermined strength, the earth and sand in the cylinder formed by the plurality of caisson walls is excavated and the caisson walls are removed to the ground to form a continuous earth retaining wall using concrete. It is characterized by forming.

[Effect]

According to the prefabricated simple caisson and earth retaining method of the present invention,
After excavating the earth and sand on the ground surface of the caisson wall and letting the caisson wall sink to a predetermined depth under its own weight, concrete is poured into the gap on the outside of the caisson wall so that it is in contact with the outside surface of the frame. An earth retaining concrete wall is formed. Therefore, by sinking the caisson wall along the boundary with the adjacent land, an earth-retaining concrete wall is formed at the very edge of the boundary. Furthermore, by removing the caisson alone above ground, a basement can be constructed in contact with a continuous earth retaining wall formed of earth retaining concrete.

In addition, the caissons are prefabricated, and the earth retaining concrete walls can be cast on-site, which is advantageous for storage and transportation.

Furthermore, the soil on the ground surface of each caisson is excavated and the caisson sinks to a predetermined depth due to its own weight, so it does not affect the ground of adjacent land, and there is no need to use an auger, so a large site can be secured. There's no need to do that.

〔Example〕

Hereinafter, the present invention will be explained based on illustrated embodiments. As shown in Fig. 1, the prefabricated simple caisson A has a caisson wall 2 formed by vertically connecting a plurality of caisson units 1.
It is constructed by combining them into a cylindrical shape.

The caisson unit 1 has a vertically long frame 1a as shown in FIG.
A form panel 1b is removably attached to the outer surface of the frame body 1a using attachment means, and a gap 1c for pouring earth retaining concrete is formed between the outer surface of the frame body 1a and the form panel 1b. has been done. The frame 1a is formed by stretching a metal plate over a frame made of square timbers. ld is a spacer that protrudes from the outer surface of the frame 1a and prevents the formwork panel 1b from curving toward the frame 1a due to earth pressure.

The form panel lb is bent into an L-shape near both ends to prevent the retaining concrete from flowing out laterally from the gap IC.

A blade-shaped portion 1e is formed at the lower end of the template panel 1b of the caisson unit 1 located at the lowest stage of the caisson wall body 2 to facilitate sinking. The dimensions of the frame 1a may be designed as appropriate, such as, for example, a vertical dimension of 180 cm, a horizontal dimension of 70 cm, and a height dimension of 45 cm.

The attachment means for attaching the formwork panel 1b to the frame body 1a is to provide holes (not shown) in the frame body 1a and the formwork panel 1b, respectively, and attach the formwork to the formwork using bolts and nuts (not shown) through these holes. The panel 1b is configured to be attached to the frame 1a. The above-mentioned hole portion is constituted by a vertically elongated elongated hole and a large-diameter hole located on the side of the elongated hole and large enough to allow a bolt or nut to be inserted therethrough, which are continuous to each other. Then, when sinking the caisson wall 2 into the soil, the bolts are placed in the long holes of the holes, and when the form panel lb is dug out on the ground, the loosened bolts and nuts are inserted into the large diameter holes. Move it and then pull it out from the hole.

The attachment means functions so that the form panel 2 does not come off the frame 1a when the caisson wall 2 sinks, as described above, and can be removed from the frame 1a and pulled out of the soil after the caisson wall 2 sinks. Therefore, the configuration is not limited to the above configuration, and the design can be changed as appropriate.

Caisson unit 1 made to construct caisson wall 2
To connect them, formwork panels ib are connected to each other using connecting plates 1f and bolts 1g, as shown in Fig.
A are also connected to each other as appropriate using Holt or the like.

The construction of earth retaining using the simple prefabricated caissons constructed in this way is as follows. The broken line in Figure 4 (a) indicates the excavation plan area, and the line (a) indicates the boundary with the neighboring house.
First, the caisson wall 2 is placed close to the boundary A (the fourth
(shown in Figure (b)).

Next, the earth and sand in the ground contact part of the caisson wall 2 is excavated with an excavator, etc., and the caisson wall 2 is lowered to a predetermined depth by its own weight (as shown in FIG. 4(C)), and the caisson 1 is further removed as appropriate. Add more and sink to the specified depth (Figure 4 (d) (
(shown in e)). Next, earth retaining concrete 3 is poured into the gap IC on the outside of the caisson wall 2, and the form panel 1b of the caisson wall 2 is pulled out of the soil before the earth retaining concrete 3 hardens (Fig. 4(f)). g)). Next, the other caisson walls 1b are sequentially lowered in the same manner, and the plurality of caisson walls 1b are assembled into a cylinder in the soil to form the caisson A. Meanwhile, earth retaining concrete is poured and the formwork panels are sequentially assembled. Pull it out.

At this time, it goes without saying that the construction process must be adjusted so that joint defects (cold joints, etc.) do not occur between adjacent earth retaining concrete. In this way, caisson A
The earth retaining concrete 3 is continuously formed along the outer periphery of the earth retaining concrete 3. After the earth-retaining concrete 3 has developed a predetermined strength, the earth-retaining concrete 3 is constructed by excavating the earth and sand opening in the caisson A, disassembling the caisson wall 2 into each frame 1a, and removing it to the ground. A cylindrical earth retaining continuous wall 4 is formed.

Note that the construction order can be changed as appropriate; for example,
After the caisson A is formed in the soil, the retaining concrete 3 may be poured at once, and then the metal formwork panel 1b may be pulled up.

A basement 5 is constructed within the earth retaining continuous wall 4 formed as described above (shown in FIG. 5). As shown in the figure, a waterproof vinyl sheet 6 is adhered to the inner peripheral surface of the continuous earth retaining wall 4 with adhesive, and the concrete frame 5 of the basement 5 is
A is formed in close contact with the earth retaining continuous wall 4. Styrofoam 5C is formed on the inner surface of the wall 5b of the concrete frame 5a. In the figure, 5d is the reinforcement part of the concrete frame 5a, 5e is the concrete part, and 5f
is a waterproof board made of hinyl chloride resin disposed at the joint between the floorboard 5g and the wall 5b.

FIG. 6 shows a general view of a building 7 having a basement 5, which is located close to boundary A.

〔Effect of the invention〕

As is clear from the above explanation, according to the prefabricated simple caisson and earth retaining method of the present invention, by sinking the caisson alone along the boundary with the adjacent land, it is possible to form a concrete wall at the very edge of the boundary. Furthermore, after removing the caisson wall above ground, it is possible to construct a basement next to the continuous earth retaining wall made of earth retaining concrete, making it possible to construct the basement to the boundary with the adjacent land, making the site more efficient for cultivation. This has the effect that it can be used for many purposes. Furthermore, by adjusting the shape and dimensions of the caisson itself, it is possible to deal with even somewhat complex boundaries with adjacent land.

Furthermore, since the caisson is prefabricated and the earth retaining concrete is cast on site, it has the advantage of being easy to transport and bring in.

Furthermore, the earth and sand on the ground surface of each caisson is excavated and the caisson sinks to a predetermined depth due to its own weight, so there is no negative impact on the ground of the adjacent land, and no noise or vibration will cause a nuisance to the neighbors. This effect is achieved.

Furthermore, since the building can be mounted on a continuous wall for retaining earth, the construction period can be shortened and construction costs can be reduced. Figure 3 is a perspective view of a simple caisson; Figure 3 is a front view showing a state in which the caissons are connected vertically; Figures 4 (a) to (h) are construction steps for an earth-retaining concrete wall using a simple assembled caisson. FIG. 5 is a cross-sectional view of the earth-retaining concrete wall and the concrete frame of the basement, and FIG. 6 is a cross-sectional view of the entire building including the basement.

(Explanation of symbols) A... Simple assembly type caisson ■... Caisson unit 1a... Frame body ■b... Formwork panel 1c... Gap section for pouring earth retaining concrete 2...
・Caisson wall 3... Earth retaining concrete 4... Continuous wall for earth retaining

Claims (2)

[Claims] (1) Formwork panels are removably attached to the outer surface of the frame, and a gap for pouring earth retaining concrete is formed between the outer surface of the frame and the formwork panel to form a single caisson. A simple assembly type caisson characterized in that a caisson wall is formed by vertically connecting a plurality of the above-mentioned caisson units, and a plurality of the above-mentioned caisson walls are combined into a cylindrical shape. (2) A caisson unit in which a form panel is detachably attached to the outer surface of the frame body, and a gap for pouring earth retaining concrete is formed between the outer surface of the frame body and the form panel. A caisson wall is formed by connecting a plurality of the caisson units above and below, and the earth and sand in the ground contact part of the caisson wall is excavated and the caisson wall sinks to a predetermined depth by its own weight. Inside, a plurality of the caisson walls are combined into a cylindrical shape, and earth retaining concrete is poured into the gap on the outside of the sunken caisson wall, and then only the formwork panel is pulled out of the soil. After the earth retaining concrete has developed a predetermined strength, the earth and sand in the cylinder formed by the plurality of caisson walls is excavated and the caisson walls are removed to the ground to form a continuous earth retaining wall using concrete. An earth retaining method characterized by the formation of