JP2818816B2 - Manhole cover height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to an underground structure such as a manhole laid under a road, and a height of a cover installed at a work opening serving as an entrance to the ground of the manhole. And a cover height adjusting device which facilitates an adjusting operation for adjusting the height to the road surface height and inclination.

[Conventional technology]

Generally, underground roads, such as communication cable pipes, electric power cable pipes, gas pipes, and water pipes, are laid under the roads, and work openings serving as entrances to the ground at predetermined intervals of the above-mentioned underground pipes are provided. The provided manhole is provided. An iron or concrete lid adapted to the height of the road is fitted into the work hole of the manhole.

However, when an underground structure such as the above manhole is provided under an existing road, or when a road is paved after the manhole is provided, the manhole cover height does not always match the road surface height or slope. Therefore, it was necessary to adjust the height and inclination of the lid by raising the height of the lid or the like. Therefore, conventionally, when adjusting the iron lid such as a manhole provided under a road to the height of the road surface, for example, the fifth step As shown in the figure, an iron piece, concrete piece, or wood piece cut to an appropriate height is formed on an upper end face 22a of a lid frame receiving portion of a work opening 22 formed above a concrete manhole 21 provided under a road. An equalization adjusting member 23 is installed between the iron cover frame 24 and the iron cover 25 to adjust the iron cover 25 to match the road surface height.
Then, the outer frame 26 is fixed to the outside of the height adjusting member 23,
By filling the gap between the outer frame 26 and the inner peripheral surface of the working port 22 with cement mortar 27, the iron cover frame 24 is fixed to the upper end face of the working port 22.

Also, instead of the height adjusting member 23, the upper end surface of the lid frame receiving portion
A plurality of studs are implanted in 22a, an iron lid frame 24 is installed on the studs via conical coil springs, and the iron lid frame 24 is tightened with nuts to adjust the manhole cover height. What has been proposed.

[Problems to be solved by the invention]

However, in the above-described conventional work, since the cover height of the manhole is adjusted by site adjustment via the height adjustment member 23, a large number of height adjustment members 23 having different heights for each manhole must be prepared. In addition, inventory management is troublesome and troublesome, resulting in high costs.

In addition, when the manhole cover is inclined in the direction of the road shoulder, it is necessary to adjust the height according to the inclination angle, and not only the number of types of the height adjusting members 23 increases, but also the number of man-hours increases and road traffic increases. Since the period of stopping is long, there are problems such as unfavorable traffic measures.

Further, the one using the stud bolt and the conical coil spring has a feature that the height adjustment is easy and easy and the height adjustment allowance is large, but the bolt having the upper end of the conical coil spring drilled in the iron lid frame 24 is provided. Since the contraction of the spring becomes unstable because it is fitted into the insertion hole or its contact area is small, a washer was required between the upper end of the conical coil spring and the iron lid frame 24.

Furthermore, the studs and the conical coil springs were filled with cement mortar together with the surrounding air gaps after the height adjustment and were fixed, and could not be reused.

The present invention has been proposed to solve the above-described problems, and the height of the road surface is adjusted by arbitrarily adjusting the height and inclination of a lid installed in a work opening serving as an entrance to the ground of a manhole. Simplifies the adjustment work to match the height and inclination, allows for quick installation, eliminates the need for a washer between the upper end of the conical coil spring and the iron lid frame 24, and reuses the stud and conical coil spring. It is an object of the present invention to provide a manhole cover height adjusting device that can be used.

[Means for solving the problem]

In order to achieve this object, the present invention provides a manhole cover height adjusting device that adjusts a manhole cover laid under a road or the like to a road surface height,
A plurality of studs are planted on the upper end surface of the lid frame receiving portion formed in the work opening at the upper part of the manhole, and the studs are gradually reduced in diameter from the lower part to the upper part, and from the smallest diameter part to the outer side. A lid frame for mounting the lid is mounted via a conical coil spring having a contact portion having a diameter larger than the minimum diameter portion, and the lid frame is configured to be tightened with a nut. And a cover that is capable of extending and contracting in the direction and that covers the outer periphery of the conical coil spring in a confidential manner.

[Action]

Based on such a configuration, according to the present invention, a plurality of studs are implanted on the upper end surface of the lid frame receiving portion formed in the work opening above the manhole, and the abutment portion is attached to the stud. A lid frame for mounting the lid body was placed via the formed conical coil spring, and the lid frame was tightened with a nut, so that the upper surface of the lid body attached to the lid frame could be adjusted according to the road surface height. Therefore, the lid height and the lid inclination angle can be arbitrarily and stably adjusted only by the nut tightening operation. In addition, since the contact portion of the conical coil spring functions as a washer, the washer can be omitted.
Therefore, there is no need to prepare many types of height adjusting members, and the work can be performed in a short time by a simple operation, and the cost can be significantly reduced.

In addition, since the outer periphery of the conical coil spring is confidentially covered with a covering body that can expand and contract in the vertical direction, the stud and the conical coil spring are not solidified by cement mortar, and the lid height of the next manhole is adjusted. Sometimes can be reused.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing the upper structure of a manhole according to the present invention. In the figure, reference numeral 1 denotes a concrete manhole provided under a road or the like, 2 denotes an entrance to the ground formed above the manhole 1, and Reference numeral 3 denotes a cover of the manhole 1 and 4 denotes a cover frame to which the cover 3 is attached.

The lid 3 and the lid frame 4 are generally made of iron or cast iron. The base 4a of the lid frame 4 to which the lid 3 is attached is worked via a conical coil spring 5 and a cover 13 shown in FIG. It is placed on the upper end surface 2a of the lid frame receiving portion of the mouth 2 and the periphery thereof is fixed with a cement mortar 6.

That is, in the upper end surface 2a of the lid frame receiving portion of the working port 2, implant bolts 7 are embedded in at least four places on the circumference in advance, and the conical coil spring 5 is inserted into the implant bolt 7. Is done.

Here, as shown in FIG. 3, the conical coil spring 5 has a coil diameter gradually decreasing toward the top, and a contact portion 5a having a diameter larger than the minimum diameter portion outward from the minimum diameter portion.
Is formed in a conical shape so as to be substantially flat in the state of maximum deflection, a sufficient amount of deflection of the conical coil spring 5 is obtained, and the contact portion 5a The conical coil spring 5, which is in contact with the base 4a of the lid frame 4 over a relatively large area, functions like a washer for stably bending the conical coil spring 5. In addition, the coating 13
It is made of synthetic resin or rubber, and has a bellows shape that can expand and contract in the up and down direction. It covers the outer periphery of the conical coil spring 5 in a secure manner and prevents cement mortar 6 from entering the conical coil spring 5 side. is there.

Further, a conical coil spring 5 and a base hole 4a of the lid frame 4 placed on the lid frame receiving portion upper end surface 2a of the working port 2 via the conical coil spring 5 have bolt holes into which the studs 7 are inserted. A nut 8 is screwed into a stud 7 which is formed and protrudes from the base 4a of the lid frame 4 to the upper surface. By tightening the nut 8, the height and the inclination angle of the lid 3 attached to the lid frame 4 can be adjusted arbitrarily.

A recess 2b into which the bottom of the conical coil spring 5 is recessed is formed around the stud 7 embedded in the upper end surface 2a of the lid frame receiving portion of the working port 2. The adjustment allowance is increasing.

Further, inside and outside the lid frame 4 placed on the upper end surface 2a of the lid frame receiving portion of the working port 2, a cylindrical inner frame 9 and an outer frame 10 for fixing the lid frame 4 are respectively provided. Installed, this inner frame 9
The cement mortar 6 is filled in the gap between the outer frame 10 and the mortar.

When the cover 3 is attached to the work opening 2 of the manhole 1 via the cover frame 4, the road 12 around the work opening 2 is required in advance.
A hole or hole 12a is formed by excavating the manhole 1 in a circular or square shape. The cover 3 of the manhole 1 is adjusted to the height of the road surface of the road 12, and the cover frame 4 is fixed with a cement mortar 6 and then repaired by paving or the like. Is done.

Next, an operation of raising the cover 3 by the manhole cover height adjusting device configured as described above will be described.

First, when a cover frame having the lid 3 attached thereto is fixed to the work opening 2 of the manhole 1 constructed under the road, the road 12 around the work opening 2 is cut into a circular or square shape in advance. To expose.

Next, the conical coil spring 5 is inserted into the stud 7 implanted in the upper end face 2a of the lid frame receiving portion of the working port 2, and the covering 13 is fitted around the outer periphery of the conical coil spring 5, and the stud At the same time, the base 4a of the lid frame 4 is attached from the upper part of the nut 7 and the nut 8 is screwed from the upper part of the stud 7.

Subsequently, adjustment is performed while tightening the nut 8 so that the upper end surface of the lid frame 4 matches the height of the road 12. Nut 8
Since the plurality of studs 7 planted on the upper end surface 2a of the lid frame receiving portion are tightened, the height and the inclination angle of the lid frame 4 are arbitrarily adjusted. Further, the conical coil spring 5 is in contact with the substrate 4a of the lid frame over a wide area by the contact portion 5a, and contracts stably.

After the height adjustment of the lid frame 4 is completed,
An inner frame 9 and an outer frame 10 are provided on the outside, respectively, and a cement mortar 6 is filled and fixed in a gap between the inner frame 9 and the outer frame 10. At this time, the cement mortar 6 does not penetrate into the covering 13, and therefore, the conical coil spring 5 and the stud 7
Is not solidified and can be reused at the next height adjustment of the lid frame 4.

Finally, the drilled hole 12 drilled around the work port 2
The work is completed by repairing the pavement of a.

〔The invention's effect〕

As described above, the manhole cover height adjusting device according to the present invention has a plurality of studs implanted on the upper end surface of the lid frame receiving portion formed in the work opening above the manhole. A lid frame to which the lid is attached via a conical coil spring having a contact portion at the top and a cover, and tighten the lid frame with a nut, so that the upper surface of the lid attached to the lid frame is raised to a road surface height. Since the configuration is such that the adjustment can be performed according to the height, the lid height and the inclination angle of the lid can be arbitrarily and stably adjusted only by tightening the nut. Further, since the conical coil spring has the contact portion, the contact portion functions as a washer, and the washer can be omitted. Further, since the conical coil spring and the stud are not solidified by the cement mortar, they can be reused at the next height adjustment work, which is economical and shortens the construction period.

Therefore, there is no need to prepare many types of height adjusting members, and the work can be performed in a short time by a simple operation, and the cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the upper structure of a manhole according to the present invention, FIG. 2 is a plan view showing a main part of FIG. 1, FIG. 3 is a perspective view of a conical coil spring according to the present invention, and FIG. FIG. 5 is a sectional view showing the upper structure of a manhole according to a conventional example. DESCRIPTION OF SYMBOLS 1 ... Manhole, 2 ... Working port, 2a ... Upper end surface of lid frame receiving part, 2b ... Depression, 3 ... Lid body, 4 ... Lid frame, 4a ... Base, 5 ... Conical coil spring, 6 …… Cement mortar,
7 ... stud bolt, 8 ... nut, 9 ... inner frame, 10 ...
Outer frame, 12 ... Road, 12a ... Drilling hole, 13 ... Cover.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuru Takahashi 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-2-282524 (JP, A) 54-20839 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 29/12 E03F 5/02 E03F 5/10

Claims (2)

(57) [Claims] 1. A manhole cover height adjusting device for adjusting a cover of a manhole laid under a road or the like to a road surface height, wherein a cover frame receiving portion formed at a work opening above the manhole has an upper end surface. A plurality of studs are implanted, and the studs are formed with a conical coil spring having a contact portion having a diameter gradually decreasing from a lower portion to an upper portion and having a diameter larger than the smallest diameter portion from the smallest diameter portion to the outside. A lid height adjusting device for a manhole, wherein a lid frame on which a lid body is mounted is placed, and the lid frame is fastened with a nut. 2. A manhole cover height adjusting device according to claim 1, wherein a covering body is provided on the outer periphery of said conical coil spring so as to be vertically expandable and contractable and covers the outer periphery of said conical coil spring in a secure manner. .