JP2922467B2 - Manhole cover height and tilt adjustment device for underground buried tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the height and inclination of a manhole cover for an underground buried tank, and more particularly to a height and inclination of a manhole cover for a small toilet tank, a small septic tank or a small water tank. The present invention relates to a tilt adjusting device.

[0002]

2. Description of the Related Art Generally, in areas without public sewerage facilities, wastewater discharged from houses and factories must not be discharged into public waters unless it is purified.

For this reason, a so-called combined septic tank (hereinafter simply referred to as a septic tank) for simultaneously purifying human waste and miscellaneous wastewater is required.
It consists of an oxidation tank and a disinfection tank, and the sewage flowing together with the sewage is digested and decomposed by anaerobic microorganisms in a septic tank. The liquefied part is digested and decomposed by aerobic microorganisms in an oxidation tank, and the treated wastewater is finally disinfected in a disinfection tank and discharged into public waters.

[0004] Such septic tanks are buried in residential land and the like.
Since the septic tank requires maintenance, cleaning and inspection, it requires a plurality of manholes that can be accessed by humans.

The manhole cover has a predetermined height from the ground surface, for example, 30 cm, to prevent rainwater from entering the septic tank main body.
m or deeper when the septic tank body is deeply buried (in Osaka Prefecture, the manhole cover can be as deep as 20 cm below the ground surface), or even when buried in a garage or the like, it is flush with the ground surface. I do.

By the way, if a septic tank is installed in this hole after digging a hole for burying a septic tank with a predetermined depth, it is difficult to determine the height of the manhole cover. Therefore, in order to absorb the error between the septic tank embedding hole and the septic tank main body, a proposal has been made in which the manhole cover mounting frame is vertically slidable with respect to the upper opening of the septic tank main body (Japanese Utility Model Publication No. 56-3135).
No. 2).

A proposal as shown in FIG. 5 (for example, Japanese Patent Application Laid-Open No. 7-328599, Japanese Patent Application Laid-open No. 7-331683).
No., etc.).

More specifically, a body-side rising frame 4A having an outer flange 3A at its lower end is attached to the upper surface of a septic tank body (not shown) by a plurality of bolts, and a pair of upper and lower male and female spirals is attached to the body-side rising frame 4A. The cylinder 7A is placed and attached with bolts.

The female spiral cylinder 7b has a manhole frame 21 attached thereto.
A is attached. And this male and female spiral cylinder 7
A is generally called an adjuster, and rotates the upper female spiral cylinder 7b as shown by the arrow to advance and retreat, thereby adjusting the height of the manhole cover. Note that the male and female spiral cylinder 7A and the main body side rising frame 4A are referred to as a "casing tree".

[0010]

However, in any of the above proposals, when the ground surface is inclined in a garage or the like,
Since the septic tank main body is installed horizontally, there has been a problem that the manhole cover and the inclined surface are not flush.

Therefore, the present invention has as its main object to solve such a problem.

[0012]

Means for Solving the Problems In order to solve the above problems, the gist of the present invention is to provide a rising frame integrally formed in a plastic underground burying tank, and to attach the rising frame to a short and long shaft. -A molded plastic female screw cylinder is fitted and fixed therein, and a blow-molded plastic male screw cylinder having a spherical swelling body is screwed to the female screw cylinder. A basement, characterized in that another blow-molded plastic swelled body having a frame is fitted slidably on a spherical surface, and the manhole frame is covered with a manhole cover so as to be openable and closable. It is in the height / tilt adjusting device of the manhole cover for the buried tank.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to embodiments shown in the accompanying drawings. 1 is an overall front view of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is an enlarged sectional view of a main part of FIG. 1, and FIG. 4 is an exploded view of FIG.

The septic tank 1 according to the present embodiment is manufactured by blow molding a thick-walled PVC plate (having the original tube cut out). It is suitable for a so-called merger treatment septic tank that purifies in a lump.

The septic tank 1 is divided into three to four rooms by using a filter bed contact aeration system in which anaerobic microorganisms inhabit for the treatment, so that three to four manholes 2, 2,...
In addition, these manholes 2 can withstand a static road load such as a passenger car.

The septic tank 1 will be further described. 1 and 2, the septic tank main body 3 is slightly flattened in the horizontal direction, and the lower casings 4, 4 are integrally formed by flange alignment. 5 and a concrete bottom slab 6 struck on the upper surface thereof are horizontally supported.

[0017] This supporting state is not suitable for the treatment of sewage in the tank (for example, the first and second anaerobic or aerobic filter bed tanks, contact aeration tanks, sedimentation tanks, and disinfecting tanks are tilted so that the treatment is not performed). Even if the ground surface GL is inclined,
The septic tank 1 cannot be tilted.

In general, the manhole of manhole 2 is
The cover 7 is flush with the ground surface GL, and a concrete 8 is driven around the cover. In the figure, 9 indicates a sewage inflow pipe, and 10 indicates a treated water discharge pipe.

The manhole (caliber 4) of the septic tank body 3 is used.
In the case of (50-500 mmφ) 2, the manhole cover 7 is detachably attached via a height and inclination adjusting device (axial length of about 200 to 300 mm) 11 as described below.

3 and 4, on the upper surface of the septic tank main body 3, a height of about 1 which is integrally formed at the time of blow molding.
A ring-shaped rising frame 12 of 10 mm is provided.

Therefore, the rising frame 12 does not have to be sewn to the septic tank main body 3 by bolts or the like, and can withstand a road surface load well.

A female screw cylinder 13 having a slightly smaller diameter is fixed to the rising frame 12. An outward flange 14 is integrally formed on the upper end of the female screw cylinder 13, and the outward flange 14 is placed on the upper end of the rising frame 12,
It is fixed with bolts or the like (not shown).

A spiral groove 15 is formed over the entire axial length of the female screw cylinder 13, and the axial length of the spiral
Is slightly larger than the height of the spiral, so that the number of spiral concave strips 15 is substantially one. It does not project inside and occupy a substantial internal space of the septic tank main body 3.

A male screw cylinder 17 having an inner spherical bulging portion (core) 16 is screwed into the female screw cylinder 13 so as to be able to advance and retreat.

The helical ridge 18 of the male screw cylinder 17 is formed with a number of ridges that is twice or more as large as the number of the helical concave ridges 15. It is connected continuously. The spherical swelling body 16 is formed into a sphere ring shape across a maximum diameter in the horizontal direction (the axis direction is vertical).

An outer spherical bulge (shell) 19 is externally fitted to the spherical bulge 16 so as to be slidable on a spherical surface.
A horizontal O-ring groove 20 is formed outward in the spherical bulging body 19, and an O-ring (not shown) is formed in the O-ring groove 20.
To seal the inner and outer spherical bulges 16 and 19 and smooth the spherical sliding. These inner and outer spherical bulges 16 and 19 are called an inclined joint or a universal joint.

An outer flange 21 is formed at the lower end of the outer spherical bulge 19 to form a reinforcing rib for preventing the outer spherical bulge 19 from being deformed. And maintain its inclination.

Further, a sleeve 22 is integrally formed on the upper end of the outer spherical swelling body 19, and a ring-shaped foot 24 of a manhole frame 23 is externally fitted to the sleeve 22 to be bonded and bonded. I am trying to do it.

A fitting groove 25 for the manhole cover 7 is formed on the upper surface of the manhole frame 23, and an edge 26 provided on the outer peripheral portion of the lower surface of the manhole cover 7 is fitted. ing. The manhole frame 23 is formed by PVC injection molding.

The height and inclination adjusting device 11 as described above is
A raw PVC tube (not shown) heated at about 150 ° C. or less is put into a blow molding die, and the screw and the spherical bulge are precisely formed by blow molding at an air pressure of about 10 kg / cm ² or less. It is molded.

In particular, the spiral concave strip 15 and the spiral concave strip 18 have an alternate combination of a semicircular screw (having a semicircular thread) 27 and a trapezoidal screw (having a trapezoidal thread) 28. Since the lead is formed, deformation of the uneven strip due to resin elasticity is prevented as much as possible while enlarging the lead of the screw, and the screw advances and retreats smoothly.

Next, the height and inclination adjusting device 1 as described above
A method of using the septic tank 1 provided with the first tank 1 will be described.

The septic tank 1 is crazed in a predetermined hole for burying the septic tank.
A female screw tube 13 is fixed to the rising frame 12 of the septic tank 3 in advance, and a male screw tube 17 is screwed to the female screw tube 13. An outer spherical swelling body 19 is externally fitted to the spherical swelling body 16 in the cylinder 17, and a manhole frame 23 is adhesively bonded to a sleeve 22 of the outer spherical swelling body 19. .

The septic tank 1 is placed horizontally on a concrete bottom plate 6 in a hole for burying a septic tank. Then, the manhole frame 23 is covered with the manhole cover 7.

Then, the male screw cylinder 17 is advanced and retracted, and the height of the manhole cover 7 (in the range of 0 to about 100 mm) is adjusted so as to match the ground surface GL. On the other hand, the outer spherical swelling body 19 is spherically slid to adjust the inclination of the manhole cover 7 (about 10 max.).
°) to match the slope of the ground surface GL. Next, after the septic tank 1 is embedded, the concrete 8 is wound around the outer spherical swelling body 19 and the manhole frame 23, and the height and inclination adjusting device 1
After fixing 1, the septic tank 1 is completely buried.

Since the outer spherical bulge 19 is fixed by the concrete 8, the O-ring groove 20 and the like may be omitted.

[0037]

According to the present invention, a manhole is formed by a rising frame integrally formed with a tank, a female screw cylinder, a male screw cylinder having a spherical bulge, and another manhole frame having a spherical bulge. Since the lid is mounted, the height and tilt adjusting device of the manhole cover is easily formed by blow molding, is constituted by the minimum parts, is extremely simple in structure, and can be constructed at low cost.

In particular, since the female screw cylinder is fixed to the rising frame integrally formed with the tank, the configuration is simplified, the structure can withstand a road surface load, and the tank can be hermetically sealed. In addition, the male screw cylinder does not project downward and occupy the space in the tank.

As a result, it becomes convenient as a height and inclination adjusting device for level error with the depth error of the tank burying hole and the ground surface.

[Brief description of the drawings]

FIG. 1 is an overall front view of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an enlarged sectional view of a main part of FIG.

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 is a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Septic tank, 2 ... Manhole, 7 ... Manhole cover, 11
... Height and tilt adjusting device, 12 ... Rising frame, 13 ... Female screw cylinder, 16 ... Spherical bulge inside, 17 ... Male screw tubing, 19 ... Spherical bulge outside, 23 ... Manhole frame

Claims (1)

(57) [Claims] An upright frame integrally formed in a plastic underground burying tank is provided.
A molded plastic female screw cylinder is fitted and fixed, and a blow-molded plastic male screw cylinder having a spherical swelling body is screwed to the female screw cylinder. Another spherical molded swelling body made of blow-molded plastic having a frame is slidably fitted on the spherical surface, and the manhole frame is fitted to the manhole frame.
A height and tilt adjusting device for a manhole cover for an underground buried tank, wherein the cover is openably and closably covered.