JP2001123523A - Sewage treatment tank manhole rising frame and sewage treatment tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage treatment tank manhole rising frame with good working efficiency in a construction site capable of facilitating the securement of a keeping place and reducing a transportation cost without requiring a plural ity of moldings and, at the same time, a sewage treatment tank making use of the sewage treatment tank manhole rising frame. SOLUTION: A sewage treatment tank manhole rising frame 12 is so constituted that a plate-like member 11 having a form bent in the direction of the thickness is formed by rolling it into a cylinder. This sewage treatment tank manhole rising frame 12 is connected and fixed to a manhole opening 6 for a sewage treatment tank main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raised frame for a septic tank manhole and a septic tank.

[0002]

2. Description of the Related Art A septic tank is a device for purifying sewage, and is usually buried underground for use. As shown in FIG. 2 (a), a form of a general septic tank viewed from the side thereof is provided with a sewage inflow port 2 on one side of the septic tank main body 1 and a sewage inlet on the other side of the septic tank main body 1. Discharge outlet 3 of treated water obtained by purifying sewage water so as to be lower than inlet 2
Is provided. Organic matter contained in the sewage flowing from the sewage inlet 2 is decomposed and purified in the septic tank main body, and the treated water thus obtained is discharged from the treated water discharge port 3.

[0003] Inside the septic tank body 1, a filter bed, an air diffuser, and other equipment for purifying sewage are stored (not shown). It is necessary to periodically check these devices and water quality. For this reason, the required number of manholes 4 are provided on the upper surface of the septic tank main body 1. The manhole 4 includes a rising portion 5 and an opening 6 formed on the upper surface of the septic tank main body 1. As shown in FIG. 2B, a manhole frame 7 is provided on the upper surface of the rising portion 5 by appropriate means. For example, bolt
The manhole cover 9 is mounted on the manhole frame 7 with the nut 8 fixed, and the opening 6 is always closed.

When the septic tank body 1 is buried underground, a hole having a depth such that the manhole cover 9 is at the same height as the ground is dug. However, due to the piping, sewage inlet 2
If it becomes necessary to lower the height of the pit, a deeper hole will be dug and buried. In this case, a large number of annular spacers are inserted between the manhole frame 7 and the rising portion 5 so that the manhole cover 9 is at the same height as the ground, or a septic tank manhole bulky frame is inserted. ing. As such an elevated frame for a septic tank manhole,
There is known a cylindrical structure preformed in accordance with the diameter of the manhole or a cylindrical structure in which a plurality of arc pieces are connected in a circumferential direction to form a cylindrical shape (Japanese Utility Model Laid-Open No. 5-54694).
Reference).

[0005]

However, since the diameter of the manhole is different depending on the size of the septic tank main body 1, different manhole diameters are used for the annular spacer and the prefabricated cylindrical frame. Therefore, a plurality of molding dies are required, and the cost increases accordingly. In addition, there is a problem that the storage space and the transportation cost increase. In addition, an elevated frame for a septic tank manhole having a structure in which arc pieces are connected in the circumferential direction to form a cylindrical shape is low in terms of storage space and transportation cost, but a plurality of arc pieces are connected and connected in the circumferential direction. Therefore, there is a problem that the working efficiency is poor because of the cylindrical shape.

The present invention provides an elevated frame for a septic tank manhole that does not require a plurality of molds, can easily secure a storage place, can reduce transportation costs, and has good work efficiency on site. It is another object of the present invention to provide a septic tank using such a septic tank manhole bulkhead.

[0007]

The invention as set forth in claim 1 is an elevated frame 12 for a septic tank manhole formed by rolling a plate-like member 11 into a cylindrical shape.

Since earth pressure is applied to the raised frame 12 for the septic tank manhole, the plate-like member 11 is bent in the thickness direction so as to increase the bending strength in the thickness direction. Is preferred.

That is, according to the second aspect of the present invention, the plate-like member 11 has a shape bent in the thickness direction.
2 is an elevated frame for a septic tank manhole.

Further, according to the invention of claim 3, the septic tank manhole raising frame 12 of claim 1 or 2 is connected and fixed to the manhole opening 6 of the septic tank main body 1, and This is a septic tank in which a manhole cover 9 is placed on a frame 12.

[0011]

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

The plate-like member 11 used as a material of the septic tank manhole raising frame 12 is buried underground and is exposed to corrosive gas and water vapor generated inside the septic tank main body 1, so that it has good corrosion resistance. Preferably it is a plastic material. Suitable plastic materials include, for example, polypropylene, polyethylene, thermoset polyester, rigid vinyl chloride, and the like. A fiber-reinforced plastic material is more preferable from the viewpoint of strength.

Further, since it is processed into a cylindrical shape at the installation site, the thickness of the plate member 11 is preferably a thin plate having a thickness of about 0.5 to 3 mm. Further, since the plate-like member 11 has a manhole diameter of 450 mm or 600 mm in many cases, the manhole diameter is set to a length that can be formed into a cylindrical shape having a circumference of 600 mm in diameter, and the manhole diameter is set to 450 mm in diameter.
It is preferable to cut the corresponding manhole diameter when using it in order to cope with it.

FIG. 1 (b1) shows a plate-like member 11 bent in the thickness direction so as to increase the bending strength in the thickness direction.
A plate-like member 11 having a dovetail-like uneven shape as shown in FIG.
(B1), a plate-like member 11 (b2) having a corrugated shape as shown in FIG. 1 (b2), a plate-like member 11 (b3) having a rectangular uneven shape as shown in FIG. 1 (b3), and the like. Is mentioned. The height of the bend (the height from the bottom to the top of the bend) is 0.5 to 3 from the viewpoint of strength and installation space.
mm. In addition, the interval between the bends (the distance between the valley bottoms or peaks of adjacent bends) is determined from the viewpoint of strength.
It is preferable to set it in the range of 5 to 100 mm.

When the plate-like member 11 is rolled and formed into a cylindrical shape, both ends of the plate-like member 11 are overlapped and fixed. The means for fixing is not particularly limited, and may be a known means. For example, a plate-like member 1 having a dovetail-like uneven shape
In the case of 1 (b1), as shown in FIG. 1 (c1), it is possible to fix without any special fixing means by overlapping both ends so that the unevenness fits each other. Further, as shown in FIG. 1 (c2), both end portions can be bent so as to be hooked on each other, and the bent portions can be fixed by means of hooking and fixing. FIG.
As shown in (c3), it is possible to form a joint for abutting and fixing the both ends to each other, and to fix the joint by means of fixing. In addition, both ends of the plate-shaped member 11 are overlapped and fixed with an adhesive, both ends of the plate-shaped member 11 are stacked and fixed with bolts, nuts or studs, and both ends of the plate-shaped member 11 are stacked. Means sometimes fixed by a planar fastener adhered to surfaces facing each other.

[0016] Raised frame 1 for septic tank manhole according to the present invention
2 is connected and fixed to the opening 6 of the septic tank main body 1. Various means can be used as means for connecting and fixing the septic tank manhole raising frame 12 according to the present invention to the opening 6 of the septic tank body 1. A preferred example is shown in FIG.
This will be described with reference to 2)). First, a manhole frame 7a in which a groove 13 into which the lower edge of the septic tank manhole bulky frame 12 according to the present invention fits is attached to the opening 6 of the septic tank main body 1 by appropriate means. The lower edge of the septic tank manhole elevated frame 12 is fitted, and the septic tank manhole elevated frame 12 and the manhole frame 7a according to the present invention are fixed using appropriate means such as screws or silicone caulking material. A manhole frame 7b for placing the manhole cover 9 is fixed to the upper edge of the septic tank manhole bulky frame 12 according to the present invention by the same means.

[0017]

As described above, the raised frame for a septic tank manhole according to the present invention can be manufactured by rolling a plate-shaped member into a cylindrical shape, so that a plurality of manholes having different diameters can be accommodated. No mold is required. In addition, since it can be stored and transported as a plate-shaped member until it is rolled into a cylindrical shape, it is easy to secure a storage place and the transportation cost can be reduced. Furthermore, since the working time can be shortened, the construction cost can be reduced even when an elevated frame for a septic tank manhole is required.

[Brief description of the drawings]

1 shows an embodiment of the present invention, wherein (a1) is a perspective view of a septic tank manhole elevated frame, and (a2) is connected and fixed to the septic tank manhole elevated frame at a manhole opening of a septic tank main body; Sectional view of a main part showing a state in which a manhole cover is placed on the bulkhead frame for the septic tank manhole, (b1),
(B2) and (b3) are perspective views each showing an example of a plate-like member, and (c1), (c2) and (c3) each explain an end fixing means when the plate-like member is rolled into a cylindrical shape. FIG.

FIGS. 2A and 2B show a form of a general septic tank, wherein FIG. 2A is a front view of a septic tank main body, and FIG. 2B is a sectional view of a main part of a manhole part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Septic tank main body 2 ... Inflow of sewage 3 ... Outlet 4 ... Manhole 5 ... Rise part 6 ... Opening part 7, 7a, 7b ... Manhole frame 8 ... Bolt / nut 9 ... Manhole cover 11, 11 (b1), 11 (B2), 11 (b3) ... plate-shaped member 12 ... raised frame for septic tank manhole 13 ... groove

Claims (3)

[Claims] 1. An elevated frame for a septic tank manhole formed by rolling a plate-like member into a cylindrical shape. 2. The elevated frame for a septic tank manhole according to claim 1, wherein the plate-like member has a shape bent in a thickness direction. 3. The septic tank manhole elevated frame according to claim 1 is connected and fixed to the manhole opening of the septic tank body, and a manhole cover is placed on the septic tank manhole elevated frame. Septic tank.