JPH0957242A - Structure of manhole for sewage treating vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole for a sewage treating vessel which does not allow the inflow of rain water into a sewage treating vessel body at the time of field heaping, does not allow the inflow of cement into the upper opening groove 2b of a manhole frame at the time of installation and is easy to install. SOLUTION: The lower opening groove 2a of the manhole frame 2 is fitted onto the opening peripheral edge 1a of the sewage treating vessel body 1 and the upper opening groove 2b of the manhole frame 2 is so formed as to accept a projecting line 3a disposed at the peripheral edge of the rear surface of a manhole cap 3. A water vent hole 5 is communicated with a spacing 4 formed between the outer upright wall 2c of the lower opening groove 2a and the outside surface of the sewage treating vessel body 1 from the base of the upper opening groove 2b of the manhole frame 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a manhole for a sewage treatment tank, and more specifically, a manhole frame is fitted around the opening periphery of a sewage treatment tank main body for purification treatment.
A manhole for a wastewater treatment tank, which is formed on the manhole frame so as to receive the manhole cover.

[0002]

2. Description of the Related Art Sewage treatment tanks are often stored in open storage after being produced in factories and before being used in ordinary households and other structures. At the time of storage, manhole frames and manhole covers are used. Rainwater may flow into the main body of the sewage treatment tank through the gap between and. For this reason, at the stage of actual installation, it is necessary to discharge the collected rainwater before shipping it, but it is difficult to overturn the wastewater treatment tank because it is large, and such rainwater discharge is difficult. The work is time-consuming.

As a structure of a manhole for a sewage treatment tank which solves such a problem, there is one described in Japanese Utility Model Publication No. 22069/1990.

In the structure of the manhole for a wastewater treatment tank, as shown in FIG. 4, a water draining hole 5 is bored from the bottom surface of the upper opening groove 2b of the manhole frame 2 to the outer surface of the manhole frame 2. And, with such a drainage hole 5,
The rain that is shaken on the manhole cover 3 at the time of stacking flows out of the sewage treatment tank main body 1 and goes over the upper opening groove 2b of the manhole frame 2 with which the protrusion 3a on the lower surface of the manhole cover 3 fits, and the sewage treatment tank main body. It does not flow into 1.

[0005]

However, the structure of the manhole for the sewage treatment tank according to the conventional example has the following problems. That is, when cement is poured around the manhole frame 2 of the sewage treatment tank when such a sewage treatment tank is installed, the cement flows into the upper opening groove 2b of the manhole frame 2 from the water drain hole 5, so It is necessary to remove the cement so that the ridges 3a formed on the peripheral edge of the lower surface of the manhole cover 3 can be firmly received, and the construction cannot be said to be simple.

The present invention has been made to solve the above problems, and its purpose is to prevent rainwater from flowing into the main body of the sewage treatment tank at the time of open field storage.
The purpose of the present invention is to provide a structure of a manhole for a sewage treatment tank, in which cement does not flow into the upper opening groove of the manhole frame at the time of construction and the construction is easy.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 fits the lower opening groove 2a of the manhole frame 2 into the opening peripheral edge 1a of the sewage treatment tank main body 1, and In the structure of the manhole for a sewage treatment tank, which is formed in the upper opening groove 2b so as to receive the ridge 3a provided on the lower edge of the manhole cover 3, in the structure of the manhole frame 2 from the bottom surface of the upper opening groove 2b to the lower opening groove 2a. The drain hole 5 is formed in the gap 4 formed between the outer standing wall 2c of the
It is characterized in that it is made to communicate.

In the structure of the manhole for the sewage treatment tank, the rainwater that has fallen on the manhole cover 3 flows into the upper opening groove 2b of the manhole frame 2, passes through the drain hole 5 and is exposed to the outside of the sewage treatment tank main body 1. Be drained. In addition, the cement that is poured around the manhole frame 2 when constructing this sewage treatment tank is blocked by the gap 4 formed between the outer standing wall 2c of the lower opening groove 2a and the outer surface of the sewage treatment tank main body 1, It does not easily enter the upper opening groove 2b of the manhole frame 2 through the hole 5.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the bottom surface of the upper opening groove 2b of the manhole frame 2 is inclined toward the drainage hole 5.

With such a structure of the manhole for the sewage treatment tank, even when the sewage treatment tank is stored in an inclined state, it descends onto the manhole cover 3 and flows into the upper opening groove 2b of the manhole frame 2. The rainwater is drained to the outside of the sewage treatment tank body 1 through the drainage hole 5 which is inclined and becomes the lowest.

[0011] The invention according to claim 3 is the first or second invention.
In any one of the inventions described above, a water passage mesh 6 is provided between the water drain hole 5 communication portion in the lower opening groove 2a of the manhole frame 2 and the opening peripheral edge 1a of the sewage treatment tank body 1. Is configured as.

In such a structure of the manhole frame for the wastewater treatment tank, the cement poured into the periphery of the manhole frame 2 at the time of construction is blocked by the water passage mesh 6, passes through the drain hole 5, and is opened above the manhole frame 2. It is difficult to enter the groove 2b.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described below with reference to FIG.

FIG. 1 is a cross-sectional view showing the structure of the manhole for a wastewater treatment tank of this embodiment, and FIG. 2 is a perspective view of the manhole frame 2 in the structure of the manhole for a wastewater treatment tank as seen obliquely from above. . FIG. 3 is a cross-sectional view showing a form different from the structure of the manhole for a wastewater treatment tank.

As shown in FIG. 1, the structure of the manhole for a sewage treatment tank is such that the lower opening groove 2a of the manhole frame 2 having a substantially H-shaped cross section is fitted to the opening peripheral edge 1a of the main body 1 of the sewage treatment tank. The upper opening groove 2b of the manhole frame 2 has a structure for receiving the projection 3a formed on the peripheral edge of the lower surface of the manhole cover 3. Further, the outer standing wall of the upper opening groove 2b is formed higher than the inner standing wall so that the upper end thereof substantially coincides with the surface of the manhole cover 3.

The sewage treatment tank main body 1 usually comprises a plurality of anaerobic or aerobic filtration tanks for sequentially purifying sewage in several stages, and is of a large size such as FRP. is there. For this reason, it is necessary to lift and transport it with a crane or the like, and it cannot be easily overturned. The sewage treatment tank having such a manhole structure is often stored in the open field after being manufactured in the factory. There is a possibility that it may enter the upper opening groove 2b of the frame 2, get over the standing wall inside the upper opening groove 2b, and enter the wastewater treatment tank body 1. Therefore, it is necessary to discharge this rainwater at the time of shipping.

However, in the structure of the manhole for the sewage treatment tank shown in FIG. 1, the outer standing wall 2c of the lower opening groove 2a and the sewage treatment tank main body 1 are formed from the bottom surface of the upper opening groove 2b of the manhole frame 2.
A drain hole 5 is communicated with a gap 4 formed between the outer surface and the outer surface. Even if rainwater that has fallen on the manhole cover 3 flows into the upper opening groove 2b of the manhole frame 2 through the drain hole 5, the rainwater that has entered is drained to the outside of the sewage treatment tank main body 1. Therefore, the rainwater does not enter the sewage treatment tank and is released from the trouble of draining the rainwater at the time of shipping.

The cement poured around the manhole frame 2 when constructing the sewage treatment tank has a lower opening groove.
It is difficult to enter the upper opening groove 2b of the manhole frame 2 through the water drain hole 5 by being blocked by the gap 4 formed between the outer standing wall 2c of 2a and the outer surface of the wastewater treatment tank body 1. Therefore, it is not necessary to remove the cement that enters the upper opening groove 2b at the time of construction, which facilitates the construction work.

The gap 4 formed between the outer standing wall 2c of the lower opening groove 2a and the outer surface of the sewage treatment tank body 1 is wide enough to allow rainwater to flow down and narrow enough to prevent cement from entering. Further, the fitting state of the opening peripheral edge 1a of the sewage treatment tank main body 1 and the lower opening groove 2a of the manhole frame 2 is adjusted.

FIG. 2 shows the manhole frame 2 of the above wastewater treatment tank.
FIG. 3 is a perspective view of the manhole frame 2 viewed obliquely from above, and as shown in FIG.
It is more preferable that the water drainage hole 5 is formed so that the position of the water drainage hole 5 is the lowest. That is, the manhole frame 2 has drainage holes 5 at two positions that divide the manhole frame 2 so that the bottom surface of the upper opening groove 2b at the position A, which is the farthest from the drainage hole 5, is the highest. It is formed in.

Therefore, even when the sewage treatment tank is stored in an open field with a slight inclination, the rainwater that descends on the manhole cover 3 and flows into the upper opening groove 2b of the manhole frame 2 is inclined. The water is discharged to the outside of the sewage treatment tank main body 1 through the lowest drainage hole 5. Therefore, the possibility that rainwater will enter the wastewater treatment tank body 1 is extremely low.

FIG. 3 shows a structure different from the structure of the manhole for a wastewater treatment tank described above. As shown in FIG. 3, the drain hole 5 in the lower opening groove 2a of the manhole frame 2 is shown.
It is more preferable to provide the water passage mesh 6 between the communication portion and the opening peripheral edge 1a of the wastewater treatment tank body 1.

That is, in such a structure of the manhole for a sewage treatment tank, cement is often poured and installed around the manhole frame 2 at the time of construction.
However, since the cement that is poured is provided with a water-passing mesh 6 that allows water to pass through and blocks the intrusion of the cement, the cement is blocked by the water-passing mesh 6 and the drain hole 5
It is difficult to enter the upper opening groove 2b of the manhole frame 2 through the through hole. Therefore, it is not necessary to remove the cement that enters the upper opening groove 2b at the time of construction, and the construction work is easy.

[0024]

According to the first aspect of the present invention, rainwater that has fallen on the manhole cover during field storage is drained through the drain hole and does not enter the wastewater treatment tank, and the rainwater is drained at the time of shipping. It is released from the trouble. Moreover, since it is difficult for the cement to enter the upper opening groove of the manhole frame during construction, it is not necessary to remove the cement that enters the upper opening groove, which facilitates the construction work.

According to the second aspect of the present invention, even when the sewage treatment tank is stored in an inclined state, the sewage treatment tank main body outside is passed through the inclined and lowest water drainage hole in the upper opening groove bottom surface. It is not drained into the sewage treatment tank.

According to the third aspect of the present invention, the cement that is poured around the manhole frame at the time of construction is blocked by the water passage mesh, so that it does not enter the upper opening groove of the manhole frame through the water drain hole. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a sewage treatment tank manhole according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a manhole frame in the structure of the manhole for a sewage treatment tank of the above.

FIG. 3 is a sectional view showing an embodiment different from the structure of the manhole for a wastewater treatment tank of the same.

FIG. 4 is a cross-sectional view showing the structure of a conventional sewage treatment tank manhole.

[Explanation of symbols] 1 Main body of sewage treatment tank 1a Opening edge 2 Manhole frame 2a Lower opening groove 2b Upper opening groove 2c Outer standing wall 3 Manhole cover 3a Projection 4 Gap 5 Drain hole 6 Water passage mesh

Claims (3)

[Claims] 1. A lower opening groove of a manhole frame is fitted to an opening peripheral edge of a sewage treatment tank main body, and an upper opening groove of the manhole frame is formed to receive a ridge provided on a lower surface peripheral edge of a manhole cover. In the manhole for a wastewater treatment tank, the manhole for a wastewater treatment tank is provided with a water draining hole that communicates from the bottom surface of the upper opening groove of the manhole frame to the gap between the lower opening groove and the outer surface of the main body of the wastewater processing tank. Structure. 2. The manhole frame, wherein the bottom surface of the upper opening groove is inclined toward the drainage hole.
Structure of the manhole for the sewage treatment tank described. 3. A water passage mesh is provided between a water drain hole opening in the lower opening groove of the manhole frame and an opening peripheral edge of the sewage treatment tank main body. Manhole structure for sewage treatment tank described in.