JP2655964B2 - Underground buried structure of sewer pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground burial structure of a sewer pipe, and more particularly to a main pipe connected to a main pipe by a branch pipe.
The present invention also relates to an underground burial structure of a sewer pipe including a rising pipe laid at a vertical angle or a nearly vertical inclination angle.

[0002]

2. Description of the Related Art Referring to FIG. 4, a conventional underground burial structure 1 of a sewer pipe of this kind includes a main pipe 2, and a branch pipe 4 is connected to the main pipe 2 via a saddle portion 3. . A rising pipe 5 extending and laid in a substantially vertical direction is connected to the branch pipe 4, and a mounting pipe 7 connected to a sewage basin (not shown) through a curved pipe 6 is connected to the rising pipe 5. You. After the piping, earth and sand 8 are backfilled around the riser pipe 5 and the like.

[0003]

When the backfilled earth and sand 8 consolidates and sinks due to the wheel load of a vehicle passing over it, conventionally, the riser pipe 5 sinks accordingly, and for example, as shown in FIG. Thus, there is a possibility that the rising pipe 5 may penetrate the branch pipe 4 and damage the branch pipe 4 and the main pipe 2. Therefore, a pipe joint having an elastic member for restricting the insertion position of the riser pipe 5 on the inner peripheral surface of the receiving pipe of the branch pipe 4 (Jpn.
No. 8803 (Japanese Utility Model Laid-Open No. 1-83988) and a pipe joint in which a polygonal enlarged-diameter portion is formed in the deep portion of the receiving port of the branch pipe 4 (Japanese Patent Application No. Sho 62-86).
No. 296112 (JP-A-1-141295) and a buried structure including a pipe joint in which the branch pipe 4 is formed in a bellows shape are known. In these prior arts, an allowance for lowering the riser pipe 5 is secured in advance by an elastic member, a polygonal enlarged diameter portion, a bellows portion, or the like, so as to prepare for the sinking of the riser pipe 5.

However, since it is practically impossible to predict the amount of settlement in the future, there is a limit to any of these prior arts which cannot prevent the settlement of the riser tube 5 itself. Therefore, a main object of the present invention is to provide an underground burial structure of a sewer pipe capable of preventing sinking of a rising pipe itself and preventing breakage of a branch pipe and a main pipe.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a sewage pipe underground buried structure including a main pipe and a riser pipe connected to the main pipe by a branch pipe and extending in a substantially vertical direction. The underground structure of a sewer pipe characterized by having a soft jacket covered on the outer peripheral surface of the pipe.

[0006]

A soft jacket such as a polyethylene sheet is interposed between the rising pipe and the earth and sand with the earth and sand buried around the rising pipe. Therefore, even if the soil around the riser pipe consolidates and sinks, the outer cover is only pushed down and the riser pipe does not sink.

[0007]

According to the present invention, since the sinking of the rising pipe itself can be prevented, breakage of the branch pipe and the main pipe can be reliably prevented. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. A branch pipe 16 is connected to an upper part of the main pipe 12 via a saddle portion 14. The branch pipe 16 includes a rubber ring socket 18 to which a lower end of a riser pipe 22 having a rubber ring socket 20 at its upper end and extending in a substantially vertical direction is connected. . On the outer peripheral surface of the riser tube 22, a jacket 2 having a small frictional resistance with the riser tube 22 such as a polyethylene sheet is used.
4 is covered. The upper end of the jacket 24 is locked near the upper end of the riser pipe 22 by a temporary holding means 26 such as a tape, thereby preventing the jacket 24 from dropping during construction.

The rubber ring socket 20 at the upper end of the rising pipe 22
Is connected to the other end of a curved tube 30 having a rubber ring socket 28 at one end, and one end of a mounting tube 32 is connected to the rubber ring socket 28. To the other end of the mounting tube 32, a short tube for a tub extending from a tub (not shown) is connected. At the time of construction,
First, a hole 34 is dug, and a foundation 36 is formed at the bottom of the hole 34 with sand or the like. Then, the main pipe 12 is placed on the foundation 36.
Are laid, and the branch pipe 16, the riser pipe 22, the curved pipe 30, and the like are sequentially piped. After the piping, the holes 34 are filled with earth and sand 38.

After the construction, the earth and sand 38 are compacted and settled by the wheel load of the vehicle passing through the ground surface 40. According to this embodiment, the earth and sand 38 and the rising pipe 22 are arranged as shown in FIG. As shown in FIG. 3, for example, as shown in FIG. 3, only the jacket 24 is settled with the consolidation settlement of the earth and sand 38 (indicated by an arrow in FIG. 3), and the rising pipe 22 is settled. Not done.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

3 is an illustrative view showing a state where consolidation settlement of earth and sand has occurred in the embodiment of FIG. 1;

FIG. 4 is an illustrative view showing a conventional technique;

FIG. 5 is an illustrative view showing a state in which a riser is settled in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Underground burial structure of sewer pipe 12 ... Main pipe 16 ... Branch pipe 22 ... Rise pipe 24 ... Jacket 26 ... Holding means 30 ... Curved pipe 32 ... Mounting pipe 38 ... Earth and sand

Claims (1)

(57) [Claims] 1. An underground buried structure of a sewer pipe including a main pipe and a riser pipe connected to the main pipe by a branch pipe and extending in a substantially vertical direction, and covered on an outer peripheral surface of the riser pipe. Underground burial structure for sewer pipes, characterized by having a soft outer cover.