JPH0235874Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a prefabricated underground concrete structure suitable for use in constructing vertical shafts, particularly by deep foundation construction methods.

``Conventional technology'' For example, when constructing a water collection well, conventionally, multiple concrete segments were connected in a ring shape and then sunk using the submerged box method or, if the well was deep, the deep foundation method. ing.

By the way, when a vertical shaft such as a water collection well is constructed from a structure other than a cylinder, for example, a square tubular structure, this type of structure conventionally has the following two structures. There is. Specifically, there are two structures: one in which annularly integrated concrete peripheral wall bodies are stacked, and the other in which concrete segments in which the peripheral wall body is vertically divided into two or four sections are connected in an annular manner and stacked.

``Problems to be Solved by the Invention'' However, with the conventional vertical shaft structure having a rectangular tube shape, there were the following problems to be solved. That is, conventional integrated or two
Due to the thickness of this peripheral wall body, if the concrete peripheral wall body is divided into four parts or divided into four parts,
The problem is that new segments cannot be assembled in holes drilled through the inside of the main body of the peripheral wall, and that a rectangular cylindrical shaft cannot be constructed using the deep foundation construction method.

The purpose of the present invention is to effectively solve these problems and to provide a prefabricated underground concrete structure that can be constructed using the deep foundation method.

``Means for Solving the Problems'' The present invention is based on a method in which a plurality of concrete peripheral wall bodies formed in the shape of a rectangular cylinder with four side walls of equal length are buried in a state in which a plurality of them are stacked in the axial direction. In a concrete structure for underground burial, a part of the mutually opposing side walls of the peripheral wall main body is constituted by a pair of plate-shaped segments, and the other part is constituted by a short plate part joined to the plate-shaped segments and a pair of plate-shaped segments. It consists of four corner segments integrally molded into an L-shape by a long plate extending substantially perpendicularly from the short plate and forming half of the other side wall.

``Operation'' When constructing a water collection well using the deep foundation construction method, excavate the soil below the cutting edge for earth retaining, lower the cutting edge, and connect the cutting edge with the existing surrounding wall body directly above the cutting edge. Between,
The long plate portions of the corner segments may be connected to form opposing side wall portions, and finally the plate-like segments may be connected between the short plate portions of each corner segment.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings.As shown in FIG. A set of plate-like segments 2
and four L-shaped corner segments 3
It is mainly composed of.

These plate-like segments 2 and corner segments 3 are made of precast concrete, etc., which are standardized and produced in a factory to a certain size and shape, and a joint fitting 4 is attached to each joint end face of the bolt. A stopper cavity 4a is opened and buried in the inner surface of each segment 2, 3.

The plate-shaped segment 2 forms a part (flat plate part) of the mutually opposing side walls of the peripheral wall main body 1, and in the illustrated example, the length l ₁ is the length of the outer shape of the side wall part.
It is set to approximately 1/2 of l ₂ .

On the other hand, the corner segment 3 includes a short plate portion 3a joined to the plate segment 2, and a short plate portion 3a joined to the plate segment 2.
The long plate part 3b extends substantially perpendicularly from a and forms half of the other opposing side wall part, and is integrally molded into an L-shape.

Note that the short plate portion 3a of this corner segment 3
The joint surface between the plate-shaped segment 2 and the plate-shaped segment 2 is formed in a tapered shape that widens inward, making it easy to set the plate-shaped segment 2.

Next, the operation of one embodiment will be explained.

As shown in FIG. 2, when constructing a water collection well by the deep foundation construction method, the cutting blade 10 is lowered while excavating the lower side of the cutting blade 10 for earth retaining, and the cutting blade 10 and the cutting blade 10 are lowered. The surrounding wall main body 1 is constructed between the existing surrounding wall main body 1 located directly above the surrounding wall main body 1 by the following procedure.

That is, the corner segments 3 are suspended, these long plate parts 3b are connected, and the opposing side wall parts are assembled. Next, the plate segment 2 is lowered and the short plate portion 3a of the corner segment 3 is removed.
Insert and connect between the two. It goes without saying that it is also connected to the existing peripheral wall main body 1 located above.

"Effects of the Idea" As explained above, according to the invention, a six-part structure with a pair of plate-like segments on opposing side walls is used, so a square tubular concrete structure for underground burial is created. It has excellent effects such as being able to construct things by applying the deep foundation method. In addition, since the plate segments and corner segments of the upper and lower peripheral wall bodies can be arranged in a staggered manner, bending strength can be distributed, providing sufficient strength against earth pressure, and each segment can be arranged in a straight line. It has the advantages of being easy to manufacture, easy to set up scaffolding, etc., and highly safe.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a perspective view of the main body of the peripheral wall, and FIG. 2 being a sectional view for explaining the operation. 1... Peripheral wall main body, 2... Plate segment, 3...
...Corner segment, 2a...Inner surface, 4...
Joint fitting, 4a... Hollow space for bolting, 10...
Cutting blade.

Claims (1)

[Scope of utility model registration request] In a concrete structure for underground burial in which a plurality of concrete peripheral wall bodies formed in a rectangular cylindrical shape by four side walls of equal length are buried in a state in which a plurality of concrete peripheral wall bodies are stacked in the axial direction, the peripheral wall body is A set of plate-like segments constituting part of the side wall parts facing each other, and a short plate part joined to the plate-like segments and extending substantially perpendicularly from the short plate part to cover half of the other side wall part. It has four corner segments that are integrally formed into an L-shape by the long plate portion, and a joint fitting is attached to each joining end surface of these plate-like segments and corner segments so that the hole for bolting is connected to the inner surface of the segment. A prefabricated concrete structure for underground burial, characterized in that it is provided with an opening.