JP2000033995A - Manhole for purifying tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manhole for a purifying tank, which requires no cutting of a manhole frame in a working site of setting the purifying tank, enables the setting height of a manhole cover to be easily regulated, and further requires no manufacture of individually different manhole frames even at the time of manufacturing purifying tanks. SOLUTION: This manhole comprises a manhole frame 3 having receiving seats 8, a manhole cover receiving frame 2 fixed to the abovementioned receiving seats 8 by a height regulating bolt 7 and capable of vertically moving, and a manhole cover 1 set on and fixed to this manhole cover receiving frame 2. At least two pairs, each pair consisting of two seats, of the receiving seats 8 are set to the manhole frame 3, and the paired receiving seats 8 are provided so as to be located in a point-symmetry positions with boundary at the center of the manhole frame 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank manhole installed in a septic tank for water treatment.

[0002]

2. Description of the Related Art A septic tank manhole is a manhole installed in a septic tank used for water treatment, and is used for periodic inspection in the septic tank and for carrying out / in of parts inside the septic tank.

A conventional septic tank manhole will be described with reference to FIG. 5. The septic tank manhole is formed by a manhole frame 3 and a manhole cover 1 mounted on the manhole frame 3 and fixed by bolts (not shown). Then, the manhole frame 3 is cut so that the manhole cover 1 is horizontal to the ground surface 10 at the septic tank installation site, and then the manhole cover 1 is installed and fixed.

[0004]

However, the manhole shown in FIG. 5 has a problem in that the manhole frame 3 is cut off at the installation site of the septic tank, so that the installation period of the septic tank is lengthened. If you have done this, you also need to repair it. If the cutting operation is performed in advance in the septic tank manufacturing plant, the installation period at the installation site is shortened, but the installation mode of the septic tank varies, and cutting the manhole frame 3 according to each installation mode is troublesome. And increase the manufacturing cost.

The present invention has been made in view of the above-mentioned problems, and does not require the manhole frame 3 to be cut off at the installation site of the septic tank, the installation height of the manhole cover 1 can be easily adjusted, and the It is an object of the present invention to provide a septic tank manhole in which it is not necessary to manufacture individually different manhole frames 3 during manufacturing.

[0006]

According to the present invention, as shown in FIG. 1, a manhole frame 3 having a receiving seat 8 and a manhole cover fixed to the receiving seat 8 by a height adjusting bolt 7 and capable of moving up and down. Receiving frame 2 and the manhole cover receiving frame 2
And a manhole cover 1 mounted and fixed on the manhole frame. Two or more pairs of the receiving seats 8 are installed on the manhole frame 3 in pairs, and the pair of receiving seats 8 is located at the center of the manhole frame 3. It is characterized in that it is provided at a boundary so as to be a point target position.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A manhole cover 1, a manhole cover receiving frame 2 and a manhole frame 3 used in the present invention are:
Although the material is not particularly limited, molding by FRP is preferably compatible with a septic tank mainly made of FRP. In particular, when importance is attached to the load resistance, the manhole cover 1 and the manhole cover receiving frame 2 can be made of a cast material to have a sufficient load resistance.

As the height adjusting bolt 7 used in the present invention, a metal bolt, in particular, a rust-proof bolt can be suitably used. Further, since the height adjusting bolt 7 is used to move the manhole cover receiving frame 2 up and down, it is preferable that the length is 50 mm or more and 300 mm or less so that the height can be adjusted. This is because if it is less than 50 mm, it is often impossible to adjust the height when installing the septic tank with a slope, and it is rare to install the septic tank in a place that requires a height adjustment of more than 300 mm. This is because the manufacturing cost is unnecessarily pushed up.

The height adjusting bolt 7 is, as shown in FIG.
It is inserted from the manhole cover receiving frame 2 (hole 11) and screwed into the receiving seat 8 provided on the manhole frame 3. Then, by rotating the height adjustment bolt 7, the manhole cover receiving frame 2 is moved up and down, and when the manhole cover 1 is installed, the manhole cover 1 and the ground surface are leveled. Therefore, the height adjusting bolt 7 must not be lifted without being screwed into the receiving seat 8. If there is any lifting, the hole for inserting the height adjusting bolt 7 of the manhole cover receiving frame 2 is required. A stopper 12 is inserted into the lower surface of the lower 11 to prevent the height adjustment bolt 7 from floating.

A pair of receiving seats 8 used in the present invention are installed in pairs, and the pair of receiving seats 8 are located at a center of the manhole frame 3 as shown in FIG. Provided so that it becomes a symmetrical position. When the receiving seats 8 are provided in this manner, the entire work can be completed quickly by adjusting the height one by one. Basically, three seats 8
The height adjustment itself is possible by providing
In the case of a rectangular manhole as shown in FIG. 3 (a), the height adjustment at three points is not well balanced and the work is difficult. Therefore, even if the manhole shape is not circular but quadrangular, the work can be easily performed by installing two or more pairs of two as in the present invention. In the case where the manhole is quadrangular (rectangular or square), it is preferable to provide the receiving seats 8 at least at the four corners without breaking the balance.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part showing a manhole of the present invention. A receiving seat 8 is fastened to a manhole frame 3 made of FRP by a fixing bolt 6. The manhole cover receiving frame 2 is placed on the upper surface of the manhole frame 3, and the height adjusting bolt 7 is inserted into the hole 11 of the manhole cover receiving frame 2 via the stopper 12. The distal end is screwed into the receiving seat 8, and the manhole cover receiving frame 2 is fixed to the manhole frame 3.

After fixing the manhole cover receiving frame 2 to the manhole frame 3, the height adjusting bolt 7 is rotated at the site of the septic tank installation to adjust the height of the manhole cover receiving frame 2 as shown in FIG. After that, the manhole cover 1 is placed on the manhole cover receiving frame 2, and the locking bolt 4 is screwed into the cover lock 5 and fixed. The “gap” shown in FIG. 2 is widely described for the purpose of illustration, but is actually a gap (1
mm), and after the height adjustment is completed, sealing is performed with a caulking agent (silicon).

FIG. 3B shows a circular manhole cover 1.
FIG. 6 is a plan view in the case of using a pedestal, and a receiving seat 8 is provided every 90 degrees. FIG. 3A is a plan view when the rectangular manhole cover 1 is used as described above, and three pairs of receiving seats 8 are installed on the short sides of the rectangle.

In the septic tank in which the height of the manhole cover receiving frame 2 has been adjusted by the height adjustment bolts 7, all the manhole covers 1 can be installed so as to be horizontal with the ground surface 10 as shown in FIG. It becomes possible.

[0015]

As described above, according to the present invention, since the height of the manhole cover receiving frame on which the manhole cover is placed can be adjusted by the height adjusting bolts, the manhole is installed at the installation site of the septic tank. Since the work of cutting the frame is not required and the receiving seats are arranged point-symmetrically,
The height can be easily adjusted regardless of the shape of the manhole cover. Further, in a septic tank manufacturing plant, all manholes can be manufactured in the same shape, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a manhole of the present invention.

FIG. 2 is a sectional view of a main part after the height adjustment of the manhole shown in FIG. 1 is completed.

FIG. 3 is a plan view showing a manhole of the present invention;
(A) is an embodiment using a rectangular manhole cover, and (b) is an embodiment using a circular manhole cover.

FIG. 4 is a vertical sectional view of the entire septic tank provided with the manhole of the present invention.

FIG. 5 is a longitudinal sectional view of a manhole showing a conventional example.

[Explanation of symbols]

1. Manhole cover 2. Manhole cover receiving frame
3. Manhole frame 4. Lock bolt 5. Cover lock 6. Fixing bolt 7. 7. Height adjustment bolt Receiver 9. Septic tank 10. Ground surface 11. Hole 12. Stopper

Claims (1)

[Claims] 1. A manhole frame having a receiving seat, a manhole cover receiving frame fixed to said receiving seat by height adjusting bolts and capable of moving up and down, and a manhole cover mounted and fixed to said manhole cover receiving frame. Two or more pairs of receiving seats are provided on the manhole frame in pairs, and the pair of receiving seats is provided so as to be located in a point object with respect to the center of the manhole frame. Septic tank manhole.