JP2710738B2 - Manhole construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a manhole connected to an underground pit such as a cable, a gas, and a water and sewage pipe laid under the road.

[0002]

2. Description of the Related Art Underground pits are usually excavated in the underground part of a driveway or a living road to lay many pipes.
Cables, water and sewer pipes, gas pipes and the like are laid in this underground pit. In addition, a manhole is provided to the ground for repairing or inspecting various pipes, power lines, and the like laid in the underground pit. The manhole is usually covered with a manhole cover made of iron.

[0003] By the way, since the upper surface of the iron manhole is worn by a vehicle passing over the manhole, a slip accident of the vehicle may occur on a rainy day, which may be dangerous. Also, since the manhole cover and the road surface have different surface hardnesses, the seam is dug up for many years, causing a step.

FIG. 3A is a cross-sectional view of a conventional manhole and its lid. A manhole cover 21 is placed on the upper surface of a manhole 20 buried in a road E. In the case of a manhole having such a structure, especially on a road with heavy traffic, the ground surface is lower than the upper surface of the manhole cover 21 due to the weight of the vehicle volume and the like, so that a step 22 occurs. Therefore, in such a case, as shown in FIG. 3 (b), a repair material 23 for raising the height is laid on the road surface, and the upper layer of the manhole is hardened with resin as proposed by the present applicant. The road surface mat 24 is placed, and the periphery thereof is fixed with a step repair material 25.

[0005]

However, in the above-described construction method, in a high temperature condition in summer, etc., the step repair material 25 is softened and pushed by the frequent application of the load of the vehicle, so that the road surface mat 24 is hardened. Or the gap between the step repair material 25 and the road surface mat 24 becomes narrower, so that it is difficult to open and close the iron manhole cover 21 during inspection.

[0006]

SUMMARY OF THE INVENTION The present invention provides a structure manhole to solve the problems as described above, be those that provide the construction methods, when installing the manhole is buried manhole Above the receiving frame of the main body, a resin ring consisting of a two-layer structure consisting of a wear-resistant layer made of resin with rice hulls as a buffer layer and crushed stone and quartz sand bonded with resin is applied to the upper layer, and this manhole mat ring Thereby, the repair member for repairing the concave portion in the peripheral portion of the manhole is prevented from covering the manhole cover. Also,
Even when repairing a step on the road surface of an already laid manhole, the use of the above-described manhole mat ring can ensure the safety of vehicles passing over the upper surface.

[0007]

By using the manhole mat ring as described above, the step repair material is prevented from closing the gap of the manhole, and the manhole is easily opened and closed.

[0008]

FIG. 1 is a sectional view for explaining an outline of a method for constructing a manhole according to the present invention. In FIG. 1, reference numeral 1 denotes a manhole body embedded in a roadway or the like, and 1A denotes a manhole cover 2 made of iron. The receiving frame (flange part) for receiving is shown. Reference numeral 3 denotes a roadway surface, and the surface of the roadway surface 3 is a stepped portion 4 showing a hole dug when a manhole is attached, or a car or the like passes for many years when a manhole is already laid. As a result, the periphery of the manhole is scraped off, and the step portion 4 is present.

According to the present invention, in order to repair a manhole in such a state, a road surface mat 6 is placed on the upper surface of the manhole cover 2 and a manhole mat as described later is provided on the outer periphery of the road surface mat 6. Insert the ring 7,
It is set on the upper surface of the flange portion 1A.
Then, a pavement material 5 for repair is laid around the manhole mat ring 7 and the step portion 4 on the road surface. The pavement material 5 may be any material that can sufficiently resist peeling and abrasion by a tire, and an asphalt pavement material mixed with crushed stone or silica sand may be used.

FIG. 2 is a perspective view of the manhole mat ring 7. As shown in FIG. As shown in this figure, the inner diameter R of the manhole mat ring 7 is set to be about 4 to 5 mm larger than the inner diameter of the flange part receiving the manhole cover, and the outer diameter thereof is set to be about 7 to 10 mm larger than the outer diameter of the flange part. Designed.

The manhole mat ring 7 is manufactured by pouring a resin material containing rice husk into a donut-shaped mold. The bottom of the poured manhole mat ring 7 is formed of only a resin layer containing rice husk powder and a buffer layer 7B having a thickness of about 1 to 3 mm, and the upper layer thereof is 10 to 20 mm containing crushed stone and silica sand. Wear-resistant layer 7A of thickness
It has been. The buffer layer 7B that forms the bottom surface is the adhesive layer 7
C is adhered to the upper surface of the flange portion 1A of the manhole body via C

Since the manhole of the present invention is constructed as described above, when the manhole is first installed, the manhole is buried underground as in the prior art, and the manhole cover 2 is placed on the manhole, and the manhole is placed on the manhole. The above-mentioned road surface mat 6 is adhered to the upper surface of the manhole cover 2. (This road surface mat 6 may be fixed in advance on the upper surface of an iron manhole cover.)

Further, the flange portion 1A of the manhole body 1
The above-mentioned manhole mat ring 7 is fixed to the upper surface of the device with an adhesive or the like. Then, the stepped portion 4 with the road surface formed when the manhole is installed is formed flat by the pavement material 5, but the pavement material 5 is shifted toward the manhole cover by the side surface of the manhole mat ring 7. There is no such thing that opening and closing the manhole cover after completion is not difficult.

[0014]

As described above, the manhole according to the present invention is provided.
The construction method uses a manhole mat ring that separates the repair material that repairs the gap between the manhole cover and the road surface, so that the repair material covers the upper surface of the manhole cover with this manhole mat ring, Can be prevented from opening and closing, and it is possible to prevent the manhole or a part of the pavement material embedded around the manhole from falling into the gap between the manhole body and the manhole cover and causing a step on the road surface again. This has the effect.

Further, since the manhole mat ring and the road surface mat are made of a resin material containing rice husks, the material cost can be reduced, and the resources which have been discarded conventionally can be utilized. There is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a manhole of the present invention and a method of constructing the manhole.

FIG. 2 shows a perspective view of a manhole mat ring.

FIG. 3 is an explanatory view showing a conventional manhole and its cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole body 2 Manhole cover 3 Road surface 5 Repair material 6 Road surface mat 7 Manhole mat ring

Continuing from the front page (72) Inventor Chuichi Miyachi, 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Shoichi Nakagawa 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone (72) Inventor Kunio Tajika 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Toshinobu Ueda 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Takahiro Tomozoe 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-3-290530 (JP, A) JP-A-3-125846 (JP) , U)

Claims (2)

(57) [Claims] 1. The upper surface of a manhole body buried underground
The manhole cover is placed on the
Bonding the resin manhole mat on the upper surface, the sailing
Slightly smaller than the outer shape of the manhole cover
Resin manhole mat ring with large shape
And a step repair material is laid around the manhole mat ring.
A manhole characterized by eliminating steps with the road surface
Construction method. 2. The manhole mat and manhole according to claim 2,
The mat ring is made of resin containing rice husk as a buffer layer, and the upper layer
2 layer structure consisting of abrasion resistant layer made by combining crushed stone and silica sand with resin
3. The method according to claim 1, wherein
Manhole construction method described.