JPH09296468A - Small diameter plastic hole lid - Google Patents

Abstract

(57) [Abstract] [Problem] Even if the PVC lid of a small-diameter manhole made of PVC is buried in the earth and sand, it is detected to quickly remove the barrier of the PVC sewer system. SOLUTION: When a PVC lid 1 of a PVC small-diameter manhole used in a PVC sewage system is injection-molded, a reinforcing bar 16 which is sensitive by a simple metal detector is insert-molded. If the sewage system is damaged in a state where the sewage is temporarily buried in the earth and sand, the metal detector can detect the location of the PVC lid 1 and quickly remove the tsumari.
Since the rebar 16 is insert-molded on the PVC lid 1, it can also be used as a cast iron lid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid for a small-diameter plastic hole, and more particularly to a vinyl chloride lid for a small-diameter PVC manhole.

[0002]

2. Description of the Related Art Needless to say, a manhole is used by people for inspection or cleaning,
This is an indispensable facility for sewage systems, water tanks, septic tanks, and toilet tanks, and its manhole is covered with a lid and is sealed to achieve waterproofing and deodorization.

The manhole cover provided in the sewage system is generally made of cast iron on the roadway and reinforced concrete on the sidewalk.
The lid of the manhole provided in the septic tank is made of plastic.

As this plastic lid, for example, a lid made of a mixture of iron powder, polyester or glass fiber is known (see, for example, Japanese Utility Model Publication No. 52-34214).

On the other hand, a small-caliber PVC manhole installed in the sewage system and a small-caliber PVC masu inspection tube and a water meter box for cold regions (in the present specification, these are collectively referred to as small-caliber PVC. A made-up hole or a small-diameter plastic hole is a hole that is difficult or difficult for people to enter and exit (for example, 5 holes).
The cover is made of plastic such as PVC or cast iron for cold regions.

Particularly, a PVC lid used for a small-diameter PVC hole is a place where there is no need to worry about road surface load, such as a domestic drainage facility or a public space installed at the boundary between a public road and a residential land, or a park or It is used for drainage facilities of golf courses, is inexpensive, has excellent product accuracy such as a high sealing function, and has the advantage of not corroding. Furthermore, the scale of the lid exposed on the surface of the earth compared to conventional ones. The size is small and it does not spoil the beauty of the surrounding area, so it has been well received.

An example will be described. In FIG. 3, reference numeral 1 is a PVC lid, which is molded by injection molding, and the surface of which is not shown in FIG. It is sometimes engraved. The outer circumference of the vinyl chloride lid 1 is composed of a large-diameter outer peripheral portion 2 and a small-diameter outer peripheral portion 3, and the large-diameter outer peripheral portion 2 cannot fit into the large-diameter opening portion 5 of the lid receiving frame 4 and is closely fitted, The small-diameter outer peripheral portion 3 is sealed to the small-diameter opening 7 through a polyethylene packing 6.
Are fitted together.

Reinforcing ribs 8 are radially provided on the rear surface of the vinyl chloride lid 1, and chain locking portions 9 are also provided.

Further, stepped holes 10, 10 ... Into which a flat-blade screwdriver can be inserted are formed at three places on the outer periphery of the vinyl chloride lid 1.

On the other hand, the lid receiving frame 4 is a PVC injection molded product, and a flange 11 is provided around the upper outer periphery thereof, and an outer peripheral portion forming the large diameter opening 5 and the small diameter opening 7, and the flange 11. Are connected to each other by a plurality of reinforcing ribs 12, 12.

An opening 13 is formed below the flange 11 of the lid receiving frame 4, and is fitted into a small-diameter vinyl chloride hole (not shown) via a packing 14. Therefore, the vinyl chloride lid 1 and the lid receiving frame 4 have a waterproof / deodorant function.

Then, the lid receiving frame 4 is fitted (or sometimes fitted) to the buried small-diameter PVC-made hole, for example, in the inspection cylinder of the small-diameter PVC masu, and the PVC lid 1 is opened and closed. Fit freely. And, for inspection and cleaning, stepped hole 1
Insert a flat-blade screwdriver into 0 and tilt it down a little
Can be opened with one touch.

[0013]

However, the PVC lid used for such a small-diameter PVC hole requires a simple pipe laying work, and the vicinity of the lid is not necessarily solidified with concrete or asphalt. However, it is often covered with earth and sand or lawn, and even if it is hard to find the installation location due to snowfall, and if there is a sudden water flow obstruction (tsumari), it will take time to check and clean it, a problem occurs. At the construction site, there was a strong demand for the appearance of a PVC lid that solved this problem.

[0014] Therefore, the inventors of the present invention tried and error about the construction method and the lid structure, etc. within a range that does not impair the above-mentioned advantages of the PVC lid, opens and closes it with one touch, and does not lose the merit of mass production of the PVC lid. However, neither is preferable,
Therefore, changing the idea, the characteristics of the installation location of the PVC lid (shallow burial with a low road load, especially because the PVC lid is flush with the ground surface, the amount of earth and sand covered is small. Based on the fact that the contractor is a licensed expert, the idea was conceived, and the idea was that a simple or inexpensive metal detector could be used.

An object of the present invention is to provide a vinyl chloride lid in which a simple or inexpensive metal detector can be used while making use of the features of the conventional vinyl chloride lid.

It is known that a metal detector is used to detect a non-ferrous pipe burying place such as a concrete pipe or a joint position of a buried cast iron pipe (for example, Japanese Utility Model Laid-Open No. 56-681).
No. 78, Japanese Patent Publication No. 4-41791, and Japanese Patent Application Laid-Open No. 7-224974, etc.), if such a known example is directly applied to the detection of a PVC lid, these non-ferrous pipes are deeply buried and have high sensitivity. The advantages of conventional PVC lids (for example, city badges, patterns, pipes engraved on the PVC lid surface) are required because a metal detector is required and the iron plate is attached and the tape for detection is wrapped. It cannot be adopted at all.

[0017]

To achieve the above object, the gist of the present invention is as follows: 1) A small-diameter plastic hole buried in the ground, the surface of which is the same as the ground surface. In a plastic lid that is covered and injection-molded as described above, a metal piece is firmly integrated with the lid, and when the lid is temporarily covered with earth and sand, the metal piece is made sensitive by a metal detector. In a lid of a small-diameter plastic hole, characterized in that
The metal piece according to claim 2 is located in a lid of a small-diameter plastic hole integrated by insert molding, and 3) the metal piece according to claim 2 is a small-diameter plastic hall using an edge ring or a reinforcing bar for reinforcing the lid. -It's on the lid.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on an embodiment shown in the accompanying drawings. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A--A of FIG. 1, and the same parts as those of FIG.
Illustration and description of common parts are omitted.

The vinyl chloride lid 1A according to the embodiment of the present invention has a pipe for inspection cylinder (a vinyl chloride hose) in which the lid receiving frame 4 is fitted inside or outside.
The diameter of 15) is applicable to 50 mmφ to 200 mmφ, and for example, when the pipe diameter is 200 mmφ, the vinyl chloride lid 1
The large-diameter outer peripheral portion 2 has a diameter of 204 mmφ. This PVC lid 1 is a completely deodorant type and a one-touch opening / closing type.

In FIGS. 1 and 2, a metal ring (also referred to as an edging ring) 16 made of, for example, cast iron is integrated with the large-diameter outer peripheral portion 2 of the vinyl chloride lid 1 by insert molding during injection molding. Since the metal ring 16 is closely fitted to the large-diameter opening 5 (see FIG. 3) of the lid receiving frame 4 to prevent it from falling down,
The lower drawing taper 16A has the same size as the conventional one and has the same shape. The lower drawing taper 16A can withstand a road surface load of about 5 tons for the 200 mmφ type.

Further, the metal ring 16 is provided with a ridge portion 17 on its inner circumference, and is firmly integrated by insert molding when the PVC lid 1 is injection-molded. Especially, it does not come off even when the lid is opened and closed. I have to.

Further, at three places on the outer periphery of the metal ring 16,
Stepped holes 10,1 into which the tip of a flat-blade screwdriver can be inserted
0 ... is formed.

On the other hand, the metal detector (not shown) that is sensitive to the metal ring 16 has a property that the earth magnetism is disturbed by the buried metal and partially changes, as seen in the above-mentioned publication. It is possible to use the simplest device that utilizes this and detects this turbulence by the differential magnetic sensor to generate sound for a certain signal, and any inexpensive device with low detection power may be used. Needless to say, possessing this simple or inexpensive metal detector does not hinder a professional installer as a construction tool for drainage facilities.

Therefore, in response to the failure of the PVC sewage system, the PVC lid 1A provided with the metal ring 16 is installed temporarily (it is originally exposed but is temporarily covered). When it is thinly covered with earth and sand or the like, if the presence of the metal ring 16 is sensed by the magnetic sensor of the metal detector, the location of the vinyl chloride lid 1A can be immediately identified, and the vinyl chloride lid 1A is opened to eliminate the malfunction. be able to.

Moreover, since the PVC lid 1A is deodorant and is covered with earth and sand, it is more closely attached to the lid receiving frame 4, and when it is opened, a minus screwdriver-
Although it is often necessary to pry open the hole, it is likely to damage the stepped hole 10, but since the stepped hole 10 is provided in the metal ring 16, there is no such a concern, and the PVC lid 1A is installed. Even when dropped, there is no loss due to the drop, and in addition, the entire PVC lid 1A can be reinforced.

Although the vinyl chloride lid 1 of this embodiment is constructed by edging with the metal ring 16, the present invention is not limited to this.
It may be a PVC lid in which a reinforcing bar is insert-molded like a cover made of a reinforced concrete. By doing so, it is possible to further withstand the road load.

The PVC lid 1 is made of HIPVC, other than PVC.
It may be ABS, PE, PP, or resin concrete, and these are collectively referred to as a plastic lid.

[0028]

EFFECTS OF THE INVENTION According to the present invention, a plastic lid used for a PVC sewage system, a plastic water container box for cold regions, or the like is provided with a thin layer of sand or the like temporarily covered on the lid surface. Since the rebar, iron piece, or edging ring, etc. that are sensitive to the metal detector are integrated during injection molding, the plastic lid is kept strong, and the lid is strengthened and easily molded integrally. In addition, since only the small scale lid reacts with the metal detector, the position of the lid can be easily identified and the inspection and cleaning work of the equipment can be done quickly. Moreover, it can be used for an existing lid receiving frame, and can also be used for construction in which the periphery of the lid is solidified with concrete or the like, which in turn can be inexpensive and versatile due to the merit of mass production. .

Further, in the case of a lid formed by inserting rebar,
It can also be used as a substitute for cast iron lids for cold regions.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a conventional example.

[Explanation of symbols]

1A ... PVC lid, 4 ... Lid receiving frame, 15 ... Inspection pipe,
16 ... Metal ring

Claims (3)

[Claims] 1. A plastic lid, which is buried in the ground and is covered with a small-diameter plastic hole so that the surface thereof is flush with the surface of the earth, and which is injection-molded. A lid for a small-diameter plastic hole, characterized in that the metal piece is made integral and the metal piece is made sensitive by a metal detector when the lid is temporarily covered with earth and sand. 2. A lid for a small-diameter plastic hole in which the metal piece of claim 1 is integrated by insert molding. 3. A lid for a small-diameter plastic hole in which the metal piece according to claim 2 is used as an edge ring or a reinforcing bar for lid reinforcement.