JPH0517295U - Manhole secondary pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] When installing manholes on steep slopes, direct inflow of sewage from upstream can be sufficiently prevented even if manhole intervals are increased and sewage flow force is increased. The purpose is to obtain a pipe joint for a secondary manhole pipe. [Structure] In a manhole auxiliary pipe joint 1 including a main body portion 1A connected to a manhole M and a secondary pipe p branch portion 1B substantially orthogonal to the main body portion 1A, an opening of a branch portion 1B opening to the main body portion 1A. The upstream side 2A of the portion 2 is configured to have a tapered surface 3 that gradually lowers from the upstream toward the branch pipe 1B (arrow X), and the tapered surface 3 facilitates guiding the sewage in the sub-pipe p direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a pipe joint for a secondary manhole pipe, which includes a main body portion connected to a manhole and a branch portion for the secondary pipe that is substantially orthogonal to the main body portion.

[0002]

[Prior Art]

 Conventionally, manholes are installed in the sewer pipeline at regular intervals for maintenance and inspection of the sewer pipeline. Then, in the manhole M, in the case of the sloping ground pipe, as shown in FIG. 3, the upstream side sewage main pipe P1 is connected to a position higher than the downstream side sewage main pipe P2. In this case, when the sewage flow rate is small and almost no accumulated water is generated at the bottom of the manhole M, the bottom of the manhole M is directly tapped by the falling running water from the upstream side main sewer pipe P1 to prevent damage to the bottom of the manhole. For this reason, and in order to ensure the safety of maintenance and inspection work in the manhole, a deputy secretary p is attached (for example, JP 60-221 54, JP 61-54889, etc.).

[0003]

[Problems of conventional technology]

 By the way, when installing manholes on the above-mentioned sloping land, in consideration of the inclination of the sewer pipeline, the spacing of the manholes along the sewer pipeline is determined to be narrower as the inclination increases so that the sewer flow force does not become too large. However, in the laying work on a steep slope, it was necessary to install a manhole every several meters if the sewer flow was to be suppressed, which made the work very troublesome. Therefore, it is unavoidable that the manholes are installed without shortening the installation intervals. In this case, however, the flow velocity inevitably increases according to the length of the main pipe P1. As shown, the sewage W flows over the opening m of the sub-pipe p, and there is a problem that the provision of the sub-pipe p becomes meaningless.

[0004]

[Problems to be solved and used by the device] The present invention has the above-mentioned problems. When a manhole is installed on a steep slope, the main sewer flow from the upstream side is increased even if the manhole interval becomes large and the sewage flow force becomes large. The purpose of the invention is to provide a pipe joint for a secondary manhole pipe that can sufficiently prevent direct inflow from the side.

[0005]

[Means for Solving the Problems]

 That is, the pipe joint for a secondary manhole pipe of the present invention is a pipe joint for a secondary pipe for a manhole, which comprises a main body portion connected to the manhole and a branch portion for the secondary pipe that is substantially orthogonal to the main body portion. It is characterized in that the upstream side of the opening of the section is a tapered surface that gradually decreases from the upstream side toward the branch pipe.

[0006]

【Example】

 Next, an embodiment of this invention will be described. FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an explanatory view of a usage state of the embodiment. The manhole auxiliary pipe joint 1 of the present invention is a manhole auxiliary pipe joint 1 including a main body portion 1A connected to a manhole M and a secondary pipe p branch portion 1B substantially orthogonal to the main body portion 1A. The opening 2 upstream side 2A of the branch portion 1B which is opened to the portion 1A is formed as a tapered surface 3 which gradually lowers from the upstream side toward the branch pipe 1B (arrow X). The downstream side 2B of the branch portion 1B has the same bottom surface height as that of the main body portion 1A so that the sewage flowing down along the tapered surface 3 collides with it. Further, the plane shape of the branch portion may be an elliptical shape or the like in addition to a circular cross section.

[0007]

[Action]

 The manhole auxiliary pipe fitting 1 of the present invention is connected to the manhole M as shown in FIG. 2, and the branch pipe 1B is connected to the auxiliary pipe p whose lower end opens to the manhole bottom M '. In this state, even when the sewage flow force is large, when the sewage W flows into the manhole M, the sewage W flows down along the taper surface 3 of the branching portion, which gradually lowers, and most of it flows in the sub-pipe p direction. Even if the flow velocity is high, most of the sewage W collides with the inner surface 1B 'on the downstream side of the branch portion 1B and flows into the auxiliary pipe p.

[0008]

[Effect of the device]

 As explained above, according to the pipe joint for a secondary pipe for a manhole of the present invention, the sewage is guided by the tapered surface 3 in the p direction of the secondary pipe even under the condition that the sewage flow force is large such as on a steep slope. Direct inflow and fall into the manhole M can be effectively prevented, maintenance work can be performed safely, and damage to the bottom of the manhole M due to the falling impact of sewage can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage state of the embodiment.

FIG. 3 is a cross-sectional view of a conventional manhole.

[Explanation of symbols]

1 ... Pipe fitting for manhole auxiliary pipe 1A ... Main body portion 1B ... Branch portion 2 ... Opening portion 3 ...
Tapered surface

Claims (1)

[Scope of utility model registration request] 1. A pipe joint for a secondary manhole pipe, comprising a main body portion connected to a manhole and a secondary pipe branch portion substantially orthogonal to the main body portion, wherein an opening upstream side of the branch portion which opens to the main body portion is located upstream from an upstream side. A pipe joint for a secondary manhole pipe, characterized by having a taper surface which gradually decreases toward the branch pipe.