JPH07328599A - Method for manufacturing height adjusting device for manhole cover for septic tank - Google Patents

Abstract

(57) [Summary] [Purpose] To manufacture an adjuster for a manhole for a septic tank at low cost. [Structure] The adjuster for adjusting the height of the lid of the septic tank manhole is composed of the male and female spiral cylinder 7, and the spiral groove 13 is provided on the entire inner circumference of the upper female spiral cylinder 7b. Two spiral protrusions 11 are provided above the outer peripheral surface of the male spiral cylinder 7a, and a plurality of horizontal cutting guide grooves 1 are provided on the other outer peripheral surfaces.
In order to install 2, use inexpensive PVC pipes for each
Made by molding. Therefore, the adjuster can be manufactured with only one pad, and its adjustment can be made inexpensive while diversifying the screw forward / backward and horizontal cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a height adjusting device for a manhole cover for a septic tank.

[0002]

2. Description of the Related Art Generally, in an area where there is no public sewer system, waste water discharged from houses and factories must not be purified before being discharged into public water areas. Therefore, a septic tank is required, but a general septic tank consists of a septic tank, an oxidizing tank and a disinfecting tank. Dirt that flows in together with cleaning water is digested and decomposed by anaerobic microorganisms in the septic tank, and when the decomposition progresses, the dirt becomes Liquefaction and partly gasify. The liquefied part is digested and decomposed by aerobic microorganisms in the oxidation tank,
The treated wastewater is finally disinfected in a disinfection tank and discharged to public water bodies.

Although such a septic tank is buried in a residential area,
This septic tank requires multiple inspections, cleaning and inspections, and therefore requires multiple manholes. In order to prevent rainwater from infiltrating into the septic tank body, this manhole lid is deeper than the ground surface by a predetermined height, for example, about 30 cm or deep when the septic tank body is deeply buried (in Osaka prefecture, the manhole lid is deep. Can be deeper than the ground surface up to 20 cm), or even when flushed into the cabinet, it should be flush with the ground surface.

If a septic tank burying hole having a predetermined depth is excavated and a septic tank is installed in the septic tank burying hole, it is difficult to measure the height of the manhole cover. Therefore, in order to absorb the error between the septic tank burying hole and the septic tank main body, a proposal has been made that the manhole cover mounting frame is vertically slidable with respect to the upper opening of the septic tank main body (Actual Publication No. Sho 56-31352). (See the official gazette).

However, in the proposed height adjusting device for a manhole lid, in order to increase the height adjusting amount, it is necessary to lengthen the manhole lid mounting frame in the axial direction. Since the upper opening of the main body also requires a large rising part, although the height adjustment amount can be made large,
There is a problem that it is not possible to meet the demand for lowering the position of the manhole cover from the rising portion.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above problems, and its gist is to provide a male-female spiral cylinder detachably provided on the upper surface of a septic tank and the male-female spiral. For manufacturing a male-female spiral cylinder in a septic tank for underground burying, which comprises a manhole cover attachment frame detachably provided on the upper end of the cylinder and a manhole cover detachably provided on the manhole cover attachment frame. In order to provide an upper female spiral cylinder with a spiral groove on the entire inner circumference, a lower male spiral cylinder is provided with about two spiral convex stripes above the outer peripheral surface, and the spiral Since multiple horizontal cutting guide grooves with a slight depth toward the inside are provided on the outer peripheral surface other than the ridges, each PVC raw pipe is put in a mold and blow-molded by low pressure and low temperature to expand the diameter. Purification to be installed in general households characterized by molding by molding Use sailing - in the preparation of the height adjustment device Le lid.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to a height adjusting device for a manhole cover shown in the accompanying drawings. FIG. 1 is an overall exploded side view of an apparatus manufactured according to an embodiment of the present invention, and FIG. 2 is a usage explanatory view of this embodiment.

The septic tank of the present embodiment is made of a thick vinyl chloride plate by blow molding, and is suitable for a so-called combined treatment septic tank for collectively purifying toilet sewage and household wastewater of general households. is there. Further, in this septic tank, a filter bed contact aeration method in which anaerobic microorganisms live is adopted for the treatment. Further, this septic tank is provided with four manholes, and these manholes are designed to withstand the static load of a car or the like.

In the manhole (diameter of about 450 mmφ or 500 mmφ) of the septic tank body 1 as described above, the manhole cover 2 is provided in the following height adjusting device. In FIG. 1, a main body side stand-up frame 4 having a flange 3 at its lower end is attached to the upper surface of the septic tank main body 1 with a plurality of bolts (not shown, the same applies hereinafter). The main body side upright frame 4 has a height of about 110 mm and is made by PVC blow molding. A mounting flange 5 bent inward is formed at the upper end of the main body side rising frame 4, and the mounting flange 5
Is provided with a bolt hole 6 into which a bolt is inserted.

The standing frame 4 on the main body side has a shaft length of about 180
mm and about 170 mm, a pair of upper and lower male and female spiral cylinders 7 are screwed together and placed, and are detachably attached by bolts. This male-female spiral cylinder 7 is usually called an adjuster, and the upper female spiral cylinder 7b is rotated to be screwed back and forth,
The height of the manhole cover 2 is adjusted.

The male and female spiral cylinder 7 is manufactured as follows. A mounting flange 8 bent inward is formed at the lower end of the lower male spiral cylinder 7a, and the mounting flange 8 is further bent downward to form a fitting leg 9.
The mounting flange 8 is provided with a plurality of bolt holes 10 into which bolts are inserted. Then, the fitting foot 9 is fitted into the mounting flange 5 of the main body side rising frame 4, the both mounting flanges 5 and 8 are joined, and they are detachably fastened by bolts.

The lower male spiral cylinder 7a is provided with two (or three) spiral projections 11 on the outer peripheral surface, and the spiral projections 11 and the mounting flange 8 are connected to each other. A plurality of horizontal cutting guide cylinders 12, 12, ... Inwardly at a pitch of 25 mm and having a slight depth are provided therebetween. The lower male spiral cylinder 7a is horizontally cut by a cutter along the horizontal cutting guide cylinder 12.

Further, the female spiral cylinder 7b on the upper side is provided with a spiral groove 13 over the entire inner circumference, and a mounting flange 14 bent inward is formed at the upper end thereof, and a bolt is attached to the mounting flange 14. A plurality of bolt holes (not shown) to be inserted are provided.

The lower male spiral cylinder 7a and the upper female spiral cylinder 7b as described above are each made of a PVC original pipe (not shown).
Is placed in a blow molding die, heated to about 150 ° C. or lower, expanded by blow molding at an air pressure of 10 kg / cm ² or lower, and manufactured in one step.

The manhole cover mounting frame 15 is placed on the male and female spiral cylinder 7 as described above, and is detachably fastened with bolts. This manhole lid mounting frame 15 is made by injection molding of PP resin, and the mounting flange 14 of the upper female spiral cylinder 7b is joined to a fitting groove 18 formed by an outer peripheral ring 16 and an inner peripheral ring 17. Then, it is detachably fastened with bolts. The manhole cover 2 is placed on the upper surface of the manhole cover mounting frame 15 and is detachably fastened with bolts.

Next, a method of using the height adjusting device for the manhole cover 2 of this embodiment will be described. First, to describe a normal method of use, the septic tank main body 1 is installed in a predetermined septic tank embedding hole by suspending it with a crane or the like. The main body side rising frame 4 is attached to the upper surface of the septic tank main body 1. The male-female spiral cylinder 7 is attached to the main body side rising frame 4, and the manhole cover attaching frame 15 is attached thereon. The septic tank body 1 assembled as described above is installed in the septic tank burying hole. And
In the state as shown in FIG. 1, the male and female spiral cylinder 7 is screwed back and forth to adjust the height of the manhole cover 2 so as to be higher or deeper than the ground surface.

Next, when the male and female spiral cylinder 7 is not used, as shown by an arrow A in FIG.
Attach the manhole cover attachment frame 15. By the way, since the main body side rising frame 4 and the manhole cover mounting frame 15 can be joined with the same diameter, the mounting flange 5 of the main body side rising frame 4 and the fitting groove 18 of the manhole cover mounting frame 15 can be connected. Install with bolts.

Next, when only the lower male spiral cylinder 7a is used, the male spiral cylinder 7a below the male female spiral cylinder 7a is used.
And then cut along the predetermined horizontal cutting guide groove 12 with a cutter. Therefore, as shown by arrow B1 in FIG.
The cut lower male spiral cylinder 7a is attached to the main body side upright frame 4, and then the manhole cover attachment frame 15 is attached to the upper end of the male spiral cylinder 7a as shown by an arrow B2 in FIG. In this case, the lower male spiral tube 7a and the manhole cover attachment frame 15 are fixed by a concrete for embedding embedded in the periphery thereof. In the manhole of the present invention, a manhole lid mounting frame 15 may be used instead of the main body side standing frame 4.

[0019]

According to the present invention, since the upper female spiral cylinder is provided with the spiral groove on the entire inner circumference, the PVC original pipe is blow-molded, and the lower male spiral cylinder is
Approximately two spiral ridges were provided above the outer peripheral surface, and a PVC pipe was blow molded to provide horizontal cutting guide grooves with a slight depth on the other outer peripheral surfaces, so the height of the manhole cover was increased. The adjustment can be diversified such as screwing back and forth, horizontal cutting and non-use, and it is also possible to manufacture these convex and concave stripes and the shape of the guide groove by a single molding using an inexpensive PVC pipe, and it is cheap by blow molding. Combined with the production cost, an inexpensive height adjusting device can be provided, which is convenient for a septic tank used in general households and can contribute to its spread. Since the lower male spiral tube was provided with a horizontal cutting guide groove with a slight depth, it is of course not necessary to position the manhole lid at a position lower than the height of the contracted male and female spiral tube when cutting horizontally along this groove. , Even if a horizontal cutting guide groove with a slight depth toward the inside is provided, there is no problem in screwing with the female spiral cylinder,
Moreover, the manhole cover can be accurately placed horizontally.

[Brief description of drawings]

FIG. 1 is an overall exploded side view of an apparatus manufactured according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the use of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Septic tank main body, 2 ... Manhole cover, 7 ... Male / female spiral cylinder, 7a ... Male spiral cylinder, 7b ... Female spiral cylinder, 11 ... Spiral convex line, 12 ... Horizontal cutting guide groove, 13 ... Spiral concave line, 15 …
Manhole cover mounting frame

Claims (1)

[Claims] 1. A male-female spiral tube detachably provided on the upper surface of the septic tank, a manhole lid mounting frame detachably provided on the upper end of the male-female spiral tube, and a detachable manhole lid mounting frame. In manufacturing a male-female spiral tube in a septic tank for underground burial consisting of the provided manhole cover, an upper female spiral tube is provided with a spiral groove on the entire inner circumference, and a lower male spiral tube is also provided. In order to provide about two spiral ridges above the outer peripheral surface and to provide a plurality of horizontal cutting guide grooves with a slight depth toward the inside on the outer peripheral surface other than the spiral ridge, A method for manufacturing a height adjusting device for a septic tank manhole cover, which is installed in a general household, characterized in that a raw pipe is put into a mold and blow-molded by low pressure and low temperature to expand the diameter.