JPH0227024Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a frost heaving prevention device for buried drainage basins in cold regions.

(Prior Art) Generally, this type of drainage basin has a cylindrical adjuster body 102 having a diameter approximately the same as that of the basin body 101, and a basin body 101 having a drain port 100, as shown in FIG. The uppermost adjuster cylinder 103 has a fitting groove 105 of a lid 104 projecting from the outer periphery of its upper end.

However, the adjuster cylinders 102 and 103 are both formed to have the same diameter from the upper end to the lower end, so that they have a so-called straight cylinder shape, and because the fitting groove 105 protrudes, they cannot be buried in cold regions. In such a case, if this buried ground freezes, it will float due to the upward force of the frozen soil, that is, the frost heaving force, and the joint portion of the adjuster cylinders 102 and 103 may not be able to withstand the frost heave force and come off, causing earth and sand to enter the joint portion. There were defects that made it difficult to repair.

Therefore, in order to eliminate the above-mentioned drawbacks, the applicant of the present invention has created a drainage basin in which an upwardly inclined surface is formed on the outer periphery of the adjuster cylinder body, and the sloped surface is used to release the frost heaving force upward and prevent it from floating. He devised the idea and filed an application as Utility Model Application No. 1983-91081 (Utility Model Application No. 1983-486).

(Problems to be solved by the invention) In the drainage basin related to the earlier application, the lid body is smaller than the diameter of the basin, and the so-called opening diameter becomes small, making it difficult to clean the inside. Further, since the outer periphery of the adjuster cylinder has an inclined surface, it is not possible to connect the adjuster cylinders one after another, and there is a problem in that the depth of burial is restricted.

(Means for solving the problems) The present invention was devised to solve the problems of the drainage basin related to the above-mentioned earlier application. The present invention is characterized in that a cylindrical frost-heaving prevention device main body that can be attached to the outer periphery of a cylindrical body is formed, and an upwardly inclined surface is formed on the outer periphery of this frost-heaving prevention device main body.

(Function) According to the above means, the frost heaving force when the buried land freezes is released upward through the slope of the frost heave preventive device body, and the frozen soil is slid and floated on the slope, thereby removing the frozen soil. This prevents the adjuster cylinder from coming off from the main body.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In the figure, 1 is a main body with a drain port 11;
2 and 3 are cylindrical adjuster cylinders stacked and connected on the main body 1, and 4 is a lid fitted into the upper fitting groove 31 of the uppermost adjuster cylinder 3; A cylindrical frost heaving preventer main body 5 is formed that can be attached to the outer periphery of the body 3.

The frost heaving prevention device main body 5 has a right cylindrical cylindrical portion 51.
It consists of a truncated cone-shaped cylinder part 52 extending diagonally downward from the upper end of the cylinder part 51, and a foam filling 53 filled between the two cylinder parts 51 and 52. The conical surface of the portion 52 faces and is a so-called upwardly inclined surface 54. This cylindrical portion 52 extends to a freezing depth L or higher, and the inclined surface 54 is inclined at an angle of 5 to 30 degrees with respect to the perpendicular line, and preferably has a smooth surface. Further, in addition to being linear as shown in FIG. 1, it may be a gently curved surface as shown in FIG. Also, the cylindrical portion 52 is placed in the first position relative to the cylindrical portion 51.
It may be made longer as shown in the figure, or it may be the same as shown in Fig. 2, but it is desirable that it be at least longer than the freezing depth L at the burial site.

The freezing depth referred to here differs depending on the region, but for example, it is approximately 20 cm in the Tohoku region and approximately 40 cm in areas north of Asahikawa in Hokkaido.

Therefore, the attachment of the frost heaving prevention device main body 5 to the adjuster cylinder 3 requires
Prior to stacking and connecting to the cylinder 3, the frost heaving prevention device main body 5 is connected to the upper end of the fitting part of the cylinder 2 and the cylinder 3 by inserting and fitting the cylinder 3 into the cylinder 3 and stacking and connecting the cylinder 3 to the cylinder 2. It is intended to be held between the lower end of the fitting.

The frost heaving prevention device main body 5 can be attached by, for example, dividing the main body 5 into two parts, bringing them into contact with the adjuster cylinder 3 from both sides, and fixing them with an adhesive, or by attaching the divided parts as shown in FIGS. 3 and 4. Connecting flanges 55, 55, 56, and 56 may be formed on the walls and connected with bolts and nuts 57 and 57.If constructed in this way, it can be installed after the drainage basin is assembled, and it can be attached to the existing drainage basin. However, it can be implemented.

Further, when a scale is provided on the slope 54 as shown in FIG. 5, it is convenient because the cylindrical portion 52 of the frost heaving preventer main body 5 can be easily cut to an appropriate length according to the freezing depth L.

The present invention can be realized with various modifications other than these embodiments, but in any of the embodiments, it is desirable that the length of the cylindrical portion 52 be longer than the freezing depth L.

(Effect of the invention) Thus, when the invention is applied to a drainage basin buried in a cold region, even if the burial ground freezes, the frost heaving force will escape upward through the slope 54 of the frost heaving prevention device main body 5. This prevents the adjustment from acting on the adjuster cylinders 2 and 3 and the main body 1 through the cylinders 2 and 3, and the frozen soil that freezes due to the slope 54 slides due to the frost heaving force. This allows the frozen soil to escape upwards, thereby making it possible to reliably prevent the adjuster cylinders 2 and 3 from coming off the square body 1.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention in a state of use; Fig. 2 is a longitudinal cross-sectional view of main parts showing another embodiment; Fig. 3 is a front view showing yet another embodiment; FIG. 4 is a partial cross-sectional view thereof, FIG. 5 is a partial front view showing still another embodiment, and FIG. 6 is a vertical cross-sectional view showing a conventional drainage basin. 1... Masu body, 2, 3... Adjuster cylinder body,
4... Lid body, 5... Frost heaving prevention device main body, 54... Inclined surface.

Claims (1)

[Scope of utility model registration request] A cylindrical frost heave preventive device body that can be attached to the outer periphery of the drainage basin body or the outer circumference of an adjuster cylinder installed above the main body is formed, and an upwardly inclined surface is formed on the outer periphery of the frost heave preventive device body. A frost heaving prevention device for drainage basins featuring: