JPH0312872Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an invert provided at the bottom of a drainage basin so that sewage flows smoothly out of the inlet.

In addition, the "drainage basin" as used in the specification of this application refers to a drainage basin used for sewage water quality testing, pipe line inspection, cleaning, etc.
A general term for the residential basins installed in each building, the sewage basins installed between the main sewer pipe and the residential basin, and the manholes installed in the main sewer pipe.

[Prior Art] An invert installed at the bottom of a drainage basin is used to smoothly connect an inflow pipe and an outflow pipe to prevent filth, dirt, etc. contained in sewage from accumulating inside the drainage basin. , various shapes have been proposed in the past.

For example, in the case of Utility Model Publication No. 54-27812,
A pre-cast bottom block has been proposed in which a downwardly sloping arcuate groove is formed from the inlet pipe attachment port to the outlet pipe attachment port. This bottom mass is placed in the lower part of the water collection basin, and installed by adjusting the position so that both ends of the arc-shaped groove match the inflow and outflow pipes, respectively, and fill the gap with the inner wall of the water collection basin with cement mortar or It is fixed by filling it with.

[Problems to be solved by the invention] However, the actual positional relationship between the inflow pipe and the outflow pipe differs from drainage basin to drainage basin. For example, in the case of a sewage basin installed between a residential basin and a main sewer pipe, the installation position of the residential basin is determined by conditions such as the floor plan of the building and the shape of the site. The positional relationship between the inflow pipe and the outflow pipe connected to the pipe varies.

Therefore, in order to smoothly connect the inflow pipe and the outflow pipe using the bottom block described in the above-mentioned Japanese Utility Model Publication No. 54-27812, in which the arcuate groove is formed in advance, it is necessary to connect the inflow pipe and the outflow pipe. Every time the positional relationship of the outflow pipes changes, it is necessary to prepare a bottom block having an arcuate groove shaped according to the positional relationship. This is because if there is a slight difference in level or deviation between the inlet or outlet and the arcuate groove, the flow of sewage will be disturbed at that part.
This is because the filth, dust, etc. contained in the sewage adhere to and accumulate on the steps, gaps, etc., making it impossible to smoothly send the sewage from the inflow pipe to the outflow pipe.

The present invention provides an invert that forms a flow channel that allows sewage to flow smoothly from the inflow pipe to the outflow pipe, regardless of changes in the positional relationship between the inflow pipe and the outflow pipe in the drainage basin. The purpose is to

[Means for Solving the Problems] In order to achieve the object, the invert of the present invention has a columnar projection erected in the center, and an annular groove is formed between the inner wall and the columnar projection. It is characterized by a rectifier block placed in the area to regulate the flow direction of the sewage.

[Function] In the invert of the present invention, an annular groove is provided between the inner wall and the columnar projection, and a rectifying block is provided in the groove, thereby forming a continuous surface flow channel from the inflow pipe to the discharge pipe. be able to.

[Example] Hereinafter, the features of the present invention will be specifically explained based on the example shown in the drawings.

Fig. 3 shows a drainage basin to which the invert of the present invention is applied, Fig. 3a is a front sectional view thereof, and Fig. 3b is a side sectional view thereof.

This drainage basin has a columnar projection 2 approximately in the center of the bottom 1.
has been established. An annular groove 4 is formed between the columnar projection 2 and the inner wall 3. In the illustrated example, the annular groove 4 is formed to have a semicircular cross section. However, the shape of the annular groove 4 is not limited to this. For example, if the annular groove 4 is made to have an approximately oval cross-sectional shape that bulges outward, when a small amount of sewage flows on the annular groove 4, too,
Since the flow rate can be increased, the ability to discharge dirt and dust can be improved.

Further, as shown in FIG. 3a, the annular groove 4 is
In order to facilitate the flow of sewage from the inflow pipe 6 side to the outflow pipe 7 side, it is inclined downward so that the position facing the outflow pipe 7 is the lowest. Further, the curvature of the annular groove 4 is also formed into a continuous surface so as not to cause sudden changes in the flow of water.

On the other hand, in the illustrated example, the columnar projection 2 is formed in a cylindrical body and a hemispherical head. but,
The shape is not limited to this, and may be a conical shape or the like. Further, when forming the columnar projections 2, either method may be used in which the columnar projections 2 are arranged parallel to or inclined to the axis of the drainage basin.

A rectifying block 8 having a shape as shown in FIG. 2, for example, is installed on the bottom portion having such a columnar projection 2 and an annular groove 4, and the positional relationship between the inflow pipe 6 and the outflow pipe 7 is adjusted as shown in FIG. Place it according to the situation.

The rectifying block 8 has an inner surface 8a formed as a concave curved surface along the circumference of the columnar projection 2, and an outer surface 8b formed as a convex curved surface along the circumference of the inner wall 3 of the bottom portion 1. Further, the side surface 8c of the rectifying block 8 is in contact with the circumference of the columnar projection 2 on the inside thereof,
It is a curved surface with a curvature that is tangent to the normal line of the inner wall 3 on the outside. The bottom surface 8d has an annular groove 4
It is shaped to fit into the.

This rectifying block 8 is inserted into the annular groove 4 between the columnar projection 2 and the inner wall 3 in the following manner. That is, for the inflow pipe 6, first align the inner surface 8a of the rectifying block 8 with the circumference of the columnar projection 2, and then align the inner end of the side surface 8c so as to touch the straight line formed by the inner surface 6a of the inflow pipe 6. . This results in
From the inner surface 6a of the inflow pipe 6 to the side surface 8c of the rectifier block 8
A continuous surface extending to the circumference of the columnar projection 2 is formed. On the other hand, a rectifying block 8 is arranged in the same manner for the outflow pipe 7, and the inner surface 7a of the outflow pipe 7 is passed from the circumference of the columnar protrusion 2 through the side surface 8c of the rectifying block 8.
Forms a continuous surface that reaches .

At this time, the positional relationship of the inflow pipe 6 with respect to the outflow pipe 7 changes depending on the installation position of the inlet pipe. A rectifying block 8 is installed on the side where the flow always slopes downward from the inflow pipe 6 side to the outflow pipe 7 side. Further, after the position has been adjusted in this manner, the rectifying block 8 may be fixed in the annular groove 4 with a suitable filling material such as cement mortar. Note that if the surface layers of the inner surface 8a, outer surface 8b, and bottom surface 8d of the rectifying block 8 are made of an elastic material to maintain watertightness and employ removable fixing means, it will be easier to inspect and clean the inside of the drainage basin. , rectifier block 8
It is convenient for maintenance and inspection because it is easy to take out.

Sewage is discharged from the inflow pipe 6 to the outflow pipe 7 along the continuous surface thus created. Therefore, since the flow direction does not change suddenly in the water channel, turbulence does not occur inside the drainage basin. Moreover, since the flow channel always has a downward slope toward the outflow pipe 7, sewage does not stagnate in the drainage basin. Therefore, the sewage flowing into the drainage basin from the inflow pipe 6 flows smoothly toward the outflow pipe 7, and filth does not adhere to the inside of the drainage basin.

In addition, in the above example, the inner surface 6 of the inflow pipe 6
A continuous surface with no bending points is formed from the side surface 8c of the rectifying block 8 to the circumferential surface of the columnar projection 2 to the side surface 8c of the rectifying block 8 to the inner surface 7a of the outflow pipe 7. However, without being restricted to this, it is of course possible to use a rectifying block with some unevenness or a rectifying block with a straight side surface 8c to the extent that the rectifying state is not extremely disturbed.

[Effect of the invention] As explained above, in the invert of the invention, by arranging the rectifying block in the annular groove between the columnar protrusion formed in the center and the inner wall, drainage basins such as manholes etc. A flow channel is formed inside that allows sewage to flow in a rectified state. As a result, running water such as sewage that has flowed in from the inflow pipe flows out into the outflow pipe without creating a whirlpool. Therefore, the filth, dirt, etc. contained in the sewage are flushed out with the running water, and are not washed up by the vortex and deposited or attached to the inner wall of the drainage basin, as in the conventional case. In addition, since the rectifying block is molded separately from the bottom of the drainage basin, it can be placed at a predetermined position in the annular groove according to the positional relationship between the inflow pipe and the outflow pipe, without having to prepare various bottom blocks. can do.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a drainage basin according to an embodiment of the present invention;
FIG. 2 is a perspective view of the rectifier block used in the example, and FIGS. 3a and 3b are a front sectional view and a side sectional view, respectively, showing the bottom of the water distribution basin. 1... Bottom, 2... Columnar projection, 3... Inner wall, 4
...Annular groove, 6...Inflow pipe, 6a...Inner surface of inflow pipe, 7...Outflow pipe, 7a...Inner surface of outflow pipe, 8...
... Rectifier block, 8a...inner surface, 8b...outer surface, 8c...side surface, 8d...bottom surface.

Claims (1)

[Scope of utility model registration request] An invert characterized in that a columnar projection is erected in the center, an annular groove is formed between the inner wall and the columnar projection, and a rectifying block for regulating the flow direction of sewage is arranged in the annular groove.