JP2949276B2 - Invert for manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manhole invert used in a sewer manhole.

[0002]

2. Description of the Related Art Inverters are often installed in sewer manholes to connect an upstream sewer with a downstream sewer.

[0003] This is integrally molded with cement,
A flow guide groove having a semicircular cross section with an open top is formed. Therefore, by installing a gradient at the bottom of the manhole, when the slope of the sewer is gentle,
The downstream sewer can be connected smoothly,
By being installed almost horizontally at the bottom of the manhole,
Under the upstream sewer, it is connected to the downstream sewer, and when the sewer gradient is steep, the upstream and downstream sewers can be step-joined. That is, when the upstream and downstream sewers are step-joined in a manhole, they can receive sewage falling from the upstream sewer and guide the wastewater to the downstream sewer.

[0004]

In the prior art, since the invert is formed with a flow guide groove having a semicircular cross section, when the upstream and downstream pipes are step-joined, the upstream side and the downstream side are not connected. If the sewage falling from the sewer contains sewage, the sewage rebounds upward along the inner surface of the diversion channel, adheres to the bottom and wall surfaces of the manhole, the opening end of the sewer, and dries. Problem of falling off from the bottom, wall, etc. of the sewage and flowing into the downstream sewer, clogging the downstream sewer or excessively increasing the purification treatment burden at the sewage treatment plant was there.

[0005] In view of the above-mentioned problems in the prior art, an object of the present invention is to form a concave groove for preventing rebound at the lowermost part of the flow guiding groove, thereby clogging the downstream sewer and treating sewage. An object of the present invention is to provide an invert for manholes, which can effectively prevent an increase in processing load in a place.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the structure of the present invention is to form a bounce-preventing groove in the lowermost part of a flow guide groove having a semicircular cross section in the longitudinal direction. And

The concave groove can be formed via left and right convex stripes.

[0008] The flow guide groove may have an inward rib at an upper end portion and an upward rib at an upper end.

The bottom may be formed flat.

[0010]

According to the structure of the present invention, since the flow guide groove has a concave groove for preventing rebound at the lowermost portion, even if sewage is contained in sewage falling from the upstream sewer, In addition, rebound of dirt can be suppressed to a small extent in the flow guide groove, and dirt can be prevented from jumping to the bottom and wall surfaces of the manhole.

When the groove is formed through the left and right ridges, the ridge can form a groove by dividing the lowermost part of the flow guide groove. The shape can be substantially the same as that when no groove is formed.

When an inward rib is provided at the upper end of the flow guide groove, the inward rib protrudes in an overhanging shape at the upper end of the flow guide groove, so that sewage or dirt that jumps upward along the flow guide groove is guided. It is possible to effectively prevent jumping over the groove.

When an upward rib is provided at the upper end of the flow guide groove, the upward rib may be used as a partition member for separating between the bottom of the manhole and the invert when the entire upward rib is installed at the bottom of the manhole. It is possible to easily perform the ironing work on the bottom of the manhole.

If the bottom is formed as a flat surface, the whole will not be inadvertently rolled during storage, transportation, or installation, and is easy to handle.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

The invert 10 for manholes is formed by forming a concave groove 11 for preventing recoil at the lowermost part of the flow guide groove 10a which is open at the top (FIG. 1).

The concave groove 11 is formed in the longitudinal direction in an arcuate cross section with respect to the lowermost part of the flow guide groove 10a having a semicircular cross section via small steps 11a, 11a. Upward ribs 12, 12 are formed on the left and right sides at the upper end of the flow guide groove 10a, and the bottom 13 of the invert 10 is formed in a plane. The invert 10 has a sectional thickness of 15 mm at an arbitrary position in the circumferential direction of the flow guide groove 10a including the concave groove 11.
Formed as described above, the overall strength is sufficient.

The groove 11 has a diameter of 150 mm, 200 mm,
The steps of the steps 11a, 11a are set to about 1 to 5 mm with respect to the 50 mm guide groove 10a, and the cross-sectional shape of the guide groove 10a extends, for example, about 10 mm higher than a regular semicircle. It is formed. In addition, each upward rib 12
Is formed so as to be continuous with the inner surface of the flow guide groove 10a, and the height and the width are each set to about 8 mm.

The manhole invert 10 is as follows.
It is incorporated and used at the bottom of the manhole MH (FIG. 2,
(Fig. 3).

The manhole MH is buried in the ground surface F. At the tapered upper end of the cylindrical manhole MH, a lid MH is provided.
a is detachably mounted, and a base plate MHb is embedded in the bottom. Steps MHc, MHc... Are provided on the wall surface of the manhole MH.
An upstream conduit P1 is open in the middle of the side wall of the manhole MH, and a downstream conduit P2 is open in the lowermost portion of the side wall. The upstream and downstream sewers P1, P2
Are opposed to each other in the manhole MH.

The bottom surface of the manhole MH is formed as a gentle V-shaped slope MH1, MH1.
1. At the bottom of the MH1, an invert 10 is installed so as to be connected to the downstream pipe P2. The slopes MH1 and MH1 are the upward ribs 1 of the invert 10.
The trowel is finished so as to be continuous with the upper end surfaces of 2, 12. That is, the manhole MH is
The upstream and downstream pipes P1 and P2 are step-connected to each other through the pipe, and the invert 10 causes the sewage from the upstream pipe P1 to fall into the flow guide groove 10a, and the waste water flows through the flow guide groove 10a. To the downstream sewer P2. In addition, the concave groove 11
Because of the presence of the left and right step portions 11a, 11a, it is possible to effectively prevent sewage contained in sewage from bouncing upward along the inner surface of the flow guiding groove 10a.

The slopes MH1, MH of the manhole MH
1 can smoothly flow down into the channel 10a even if sewage falling from the pipe P1 scatters. However, it is preferable that the level difference between the sewers P1 and P2 is set to less than 60 cm, and the invert 10 adjusts the diameter of the flow guiding groove 10a to the diameter of the sewer P2 on the downstream side.

In the above description, the invert 10
The upstream and downstream pipes P1, P2 may be joined smoothly (FIG. 4). Both ends of the invert 10 are connected to the sewers P1, P2 via non-shrinkable mortars 10b, 10b and the like.
And are connected smoothly with their inner surfaces aligned.

The invert 10 can be bent at 90 ° (FIG. 5A). Invert 1
In the lowermost part of the manhole MH, 0 can connect the sewers P1 and P2 arranged at right angles (FIG. (B)). Note that, regardless of whether the invert 10 is a straight one as shown in FIG. 1 or a curved one as shown in FIG.
Both ends are formed slightly longer than the specified size, cut into appropriate lengths on site, and then mortar 10b, 10
It is preferable to connect to the sewers P1 and P2 via b or the like.

[0025]

[Other Embodiments] The concave groove 11 may be formed sufficiently wide at the lowermost part of the flow guiding groove 10a (FIG. 6).

The wide groove 11 allows the steps 11a, 11a to be formed at a sufficiently high position.
Even when the amount of sewage flowing through Oa is large, the rebound of filth can be further reduced. That is, the concave groove 1
1 can set the width dimension appropriately.

The concave groove 11 can be formed via left and right ridges 14, 14 (FIG. 7). The ridges 14, 14
By forming a pair on the left and right, the concave groove 11 can be formed at the lowermost part of the flow guide groove 10a.

The guide groove 10a is formed with a plurality of ridges 14, 14,.
May be formed through the holes (FIG. 8). However, in FIG. 8, the central groove 11 formed at the lowermost part of the flow guiding groove 10 a is formed wider than the left and right concave grooves 11.

The guide groove 10a has a plurality of ridges 14,
14 are formed in a waveform, so that the plurality of concave grooves 11,
11 may be formed (FIG. 9).

In the above description, inward ribs 15, 15 may be formed at the upper end of the flow guiding groove 10a (FIG. 1).
0). The lower part of each inward rib 15 may be continuous with the inner surface of the flow guide groove 10a via a clear overhang-shaped step (FIG. 3A), or may be formed through a smooth curved surface.
(B) and (C) in FIG. However, the guide groove 10a in FIG.
A pair of concave grooves 11, 11 are formed on the left and right sides of the groove. In addition, a clear concave groove 11 is not formed in the flow guiding groove 10a of FIG. 4C, and the entire lower part of the inward ribs 15 is the flow guiding groove 10a and the concave groove 11. .

The invert 10 may be formed integrally with a cement or a hard resin material such as vinyl chloride. Further, it is preferable that the cross-sectional shape of the flow guide groove 10a is formed so as to extend higher than a regular semicircle corresponding to the diameter of the conduits P1, P2, thereby increasing the capacity of the flow guide groove 10a. It is possible to prevent sewage containing sewage from overflowing to the slopes MH1 and MH1 on the bottom of the manhole MH when the water is increased, and to minimize a series of troubles caused by accumulation of the sewage on the slopes MH1 and MH1.

[0032]

As described above, according to the present invention, by forming a groove for preventing rebound at the lowermost part of the flow guiding groove, the groove is formed of waste material falling from the upstream sewer. Bounces can be suppressed to a small extent, so clogging of downstream sewers caused by dirt adhering to the bottom and wall surfaces of manholes, open ends of sewers, etc., and treatment burden at sewage treatment plants There is an excellent effect that the problem of the increase in can be minimized.

[Brief description of the drawings]

FIG. 1 is a perspective view of the overall configuration.

FIG. 2 is an explanatory view of a use state.

FIG. 3 is an explanatory sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view of an essential part corresponding to FIG. 2, showing another embodiment.

FIG. 5 is an overall perspective view showing another embodiment and a plan view in use.

FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment (1).

FIG. 7 is an enlarged sectional view of a main part showing another embodiment (2).

FIG. 8 is an enlarged sectional view of a main part showing another embodiment (3).

FIG. 9 is an enlarged sectional view of a main part showing another embodiment (4).

FIG. 10 is an overall end view showing another embodiment.

[Explanation of symbols]

 MH: manhole 10: invert 10a: guide groove 11: concave groove 12: upward rib 13: bottom part 14: convex ridge 15: inward rib

Claims (5)

(57) [Claims] 1. An invert for manholes, wherein a concave groove for preventing rebound is formed in the lowermost part of a flow guide groove having a semicircular cross section in the longitudinal direction. 2. The invert for manholes according to claim 1, wherein said concave groove is formed through left and right convex stripes. 3. The invert for manholes according to claim 1, wherein the flow guide groove has an inward rib at an upper end. 4. The manhole invert according to claim 1, wherein the flow guide groove has an upward rib at an upper end. 5. An invert for manholes according to claim 1, wherein the bottom is formed in a plane.