JPS6115215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method that uses a plastic inner tank with a connecting pipe and a concrete outer tank to easily assemble it into a sewage basin on site.

Conventional sewage basins usually have holes in the concrete side walls, insert plastic branch pipes into the holes, and fix the branch pipes by filling the gaps in the holes with mortar. However, since concrete and plastic do not mix well, the outer surface of the plastic pipe is sanded, etc., but the joint strength is insufficient and the mortar joint breaks due to loads such as earth pressure and wheel pressure, resulting in water leakage. It was becoming the cause of

The present invention relates to a method of constructing a sewage basin with the aim of eliminating the above-mentioned drawbacks and preventing water leakage from the connection part, and in which the end of a plastic connecting pipe leading into and out of the tank is attached to the side of a plastic inner tank. The inner tank is installed at a predetermined position, and the outside is further surrounded by an outer tank made of concrete with a cylindrical lower part provided with a notch that straddles the end of the connecting pipe. It is characterized in that the gap between the tank and the end of the connecting pipe or the inner tank is filled with mortar or the like.

The present invention will be explained below by way of an example of implementation.

In the figure, 1 is a plastic inner tank, 2
A and 2b are plastic connecting pipe ends, 3 is a closing plate, and 4 is a concrete outer tank, which is constructed as follows.

The inner tank 1 is formed into a cylindrical shape having an arbitrary shape such as a rectangular, circular, or polygonal shape and is open at the top and bottom, and holes 1a and 1b with a constant flow gradient are provided on both sides.

The connecting pipe ends 2a and 2b are connected to the above-mentioned holes 1a and 1b, respectively.
The inside of the inner tank 1 is a continuous integral body with a gutter-like body 2c having an open top as shown in the figure, and the base of the connecting pipe end 2a has a hole 1.
In a, the bases of the connecting tube ends 2b are fixed to the holes 1b, respectively. These connecting pipe ends are fixed by welding or the like.

The closing plate 3 is connected to both upper edges of the gutter-like body 2c and the inner tank 1.
A plastic plate is formed so as to close the gap with the inner circumferential surface of the inner tank 1, and is fixed by welding or the like, thereby forming a part of the bottom surface of the inner tank 1.

The outer tank 4 has a cylindrical shape made of concrete and is larger than the inner tank 1, and has the connecting pipe ends 2 on both sides of the lower part.
The notches 5a and 5b are formed deeper than the outer diameter of the end of the connecting pipe.

The inner tank 1 having the connecting pipe ends 2a, 2b and the outer tank 4 having the notches 5a, 5b are manufactured in advance at a factory, transported to the site, and constructed as follows.

(1) First, lay a foundation 6 of concrete, etc. at the bottom of the place where the sewage basin will be installed.

(2) Place the plastic inner tank 1 on the foundation 6,
The inner tank is installed on the foundation 6 with the connecting pipe ends 2a and 2b aligned in the direction of the piping (not shown).

(3) Cover the outside of the above-mentioned inner tank 1 with the concrete outer tank 4 from above, with the cutouts 5a and 5b spanning the connecting pipe ends 2a and 2b of the inner tank 1, respectively, and the lower end of the outer tank in contact with the foundation 6. Install the outer tank.

(4) The above inner tank 1 to connecting pipe ends 2a, 2b and outer tank 4
Mortar 7 is filled into the gap between the notches 5a and 5b and fixed. Note that when the inner tank 1 and the outer tank 4 are produced in a factory, the diameter of the former does not necessarily match the inner diameter of the latter, and it is unavoidable that a considerable gap will be created, so this gap is filled with concrete, etc. (figure omitted). do.

In the above figure, the connection pipe end 2a of the inner tank 1,
2b is shown as being installed in a straight line, but they may be installed at right angles or any other angle, their number may be increased or decreased, and the outer tank 4 may be installed by pouring concrete on site.

The advantages of the present invention are summarized below.

(1) The end of the connecting pipe is fixed to the plastic inner tank made of the same material by welding, etc., so it has sufficient strength compared to joining with different materials.

(2) Since the outside of the plastic inner tank is surrounded by a concrete outer tank, no external force is applied directly to the plastic inner tank, and therefore the joint at the end of the connecting pipe is sufficiently protected and the joint is protected. Combined with the high strength of the part itself, damage to the part is better prevented and there is no risk of water leakage.

(3) Once the plastic inner tank is produced in a factory, the rest can be easily installed on site, reducing construction costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an inner tank, an outer tank, etc., showing an example of the implementation of the present invention, and FIG. 2 is a longitudinal sectional side view of a sewage basin after construction has been completed. 1 is a plastic inner tank, 1a and 1b are holes, 2
A and 2b are plastic connecting pipe ends, 3 is a closing plate, 4 is a concrete outer tank, 5a and 5b are notches, 6 is a foundation, and 7 is mortar.

Claims (1)

[Claims] 1. A plastic connecting pipe end is provided on the side surface of the plastic inner tank so as to protrude to the side, leading to the inside and outside of the tank, and the inner tank is installed at a predetermined position, and the outside is further connected to the lower part of the concrete cylinder. A method of constructing a sewage basin characterized by surrounding the connecting pipe end with an outer tank provided with a notch extending over the end, and filling a gap between the outer tank and the connecting pipe end or the inner tank with mortar or the like.