JPS5835731Y2 - Volume adjustment ring for underground structure lids - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a volume adjustment ring for a cover for an underground structure that allows the cover for an underground structure to be installed quickly and reliably.

The underground structure covers mentioned here include large iron covers that serve to open and close underground objects such as water supply and sewage systems, and openings that communicate between underground structures and above-ground facilities, manhole iron covers, underground facility equipment, wiring, etc. Iron lids and mounting covers that play a protective role and open/close role, as well as fire hydrant covers and water control that play a protective role for buried conduits under roads and their auxiliary equipment, and act as opening/closing doors connecting them to the ground. A general term for valve covers, gate valve covers, air valve covers, gas pipe covers, water meter covers, etc.

During the installation of the above-mentioned underground structure cover, or after construction, depending on changes in road conditions and surrounding environment, a volume adjustment ring may be required from the beginning, or it may be necessary to perform repairs by raising or lowering the height. There are cases.

Taking as an example a manhole cover that is conventionally installed on roads as a cover for underground structures, in the former case, the cover and receiving frame are installed on the foundation concrete so that the surface of the paving asphalt etc. and the top surface of the manhole cover are the same. The volume was adjusted by pouring cement mortar between the foundation concrete and the bottom of the receiving frame so that it was even.

In the latter case, first chip away the asphalt around the manhole cover and receiving frame, remove the cover and receiving frame, then chip away the cement mortar between the foundation concrete and the bottom of the receiving frame, and stack bricks, etc. on top of the foundation concrete. The work involved re-casting cement mortar, adjusting the volume so that the top surface of the manhole cover was flush with the surface of the repaired pavement, and placing asphalt, etc. around the receiving frame.

In the above-mentioned work, cement mortar driving (or chiseling) work is absolutely unavoidable, so it takes a long time to install the receiving frame to receive the manhole cover.
This was one of the causes of traffic congestion.

Furthermore, due to its nature, cement mortar has insufficient strength, and due to cracking and peeling, there was a risk that the receiving frame would float and the lid would fly off after several years of use.

Furthermore, in order to simplify this construction, for example,
As seen in Japanese Patent No. 13553, it has been proposed to arrange a spacer between the lid and the receiving frame.

However, in such a method, the spacer is placed in a structurally extremely limited area between the lid and the receiving frame, and each spacer is only placed on the spacer, and no means of fixing or tightening is taken. However, due to the flatness accuracy and the gap between each spacer, there is a stability problem, and there is still a risk of wobbling when a heavy load from a vehicle etc. is applied to the top surface of the lid. .

The present invention was devised in consideration of the current situation, and its purpose is to stabilize the structure of the lid holder after raising the height, and to fix the tightening between the holder frame and the foundation concrete and between each volume adjustment ring. To provide a volume adjustment ring for a cover for an underground structure, which enables quick and reliable height-up installation work of a receiving frame.

The present invention will be specifically explained below based on the attached drawings.
Here, a manhole cover, which is the most popular type of cover for underground structures, will be described as an example.

In the figure, 1 is a manhole cover, 2 is foundation concrete, 3 is a volume adjustment ring according to the present invention, and 4 is a manhole receiving frame. It has an H-shaped longitudinal section.

Furthermore, 6 is an outward circular step provided on the inner edge of the upper surface of the adjustment ring 3 in order to receive the inner peripheral edge of the bottom surface of the manhole receiving frame 4 without causing any horizontal movement; 4 is a through hole provided in the flange portion 8; 9 is a through hole provided in the outer edge flange 10 of the adjustment ring 3 in alignment with the through hole 7 provided in the flange portion 8 of the manhole receiving frame; 11 is a through hole provided in the above-mentioned Anchor bolts that penetrate the through holes 7 and 9 and integrally attach the manhole receiving frame 4 and the required number of adjustment rings 3 to the foundation concrete 2; reference numeral 12 denotes a connecting bolt that connects the manhole receiving frame 4 and each adjusting ring 3;
13 is road paving with asphalt or the like.

Note that the through hole 7 is made into a long hole to facilitate insertion of the bolts 11 and 12.

Next, the manhole construction method (during renovation) using the adjustment ring 3 according to the present invention will be explained with reference to FIGS. After removing and chipping off the cement mortar, the foundation concrete 2 is exposed, and the required number of adjustment rings 3 are placed on the foundation concrete 2.
Place the manhole support frame 4 on top of it.

Then, adjust the top of the upper inner peripheral edge of the receiving frame (same height as the top surface of the manhole cover 1) to the same height as the asphalt surface after the repair, tighten the connecting bolts 12 and anchor bolts 11, and then tighten the peripheral edge of the manhole receiving frame 4. Asphalt, etc. will be placed on the area.

Furthermore, after that, if it is necessary to adjust the height of the asphalt pavement 13 surface and the top of the inner peripheral edge of the manhole receiving frame 4, it is possible to adjust the height by increasing or decreasing the adjustment ring 3 so that the heights are the same.

As described above, the manhole cover volume adjustment ring according to the present invention has the following effects.

(1) Since it is not necessary to use cement mortar, which has problems in terms of strength and casting, it is possible to improve the efficiency of construction.

(2) The volume adjustment ring can be easily and quickly attached and removed.

(3) Since the volume adjustment ring has an H-shaped cross section, the receiving frame of the underground structure cover can be received on the upper circumferential surface, and the manhole can be installed in a stable state.

The same thing can also be said about the connection between the volume adjustment rings.

(4) Each volume adjustment ring is provided with an outer edge flange that is attached by an anchor bolt and each volume adjustment ring connecting bolt, so even if the vehicle suddenly brakes, starts suddenly, or is subjected to a heavy load, it will not move horizontally. Vertical stability and strength are maintained, and the lid does not bounce at all.

[Brief explanation of drawings]

Figure 1 is a plan view of a manhole structure installed with the manhole cover volume adjustment ring according to the present invention, Figure 2 is a diagram with asphalt removed, Figure 3 is a surface view of the adjustment ring, and Figure 4 is FIG. 3 is a sectional view taken along line II-II. In the figure, 1 is a manhole cover, 2 is foundation concrete, 3 is a volume adjustment ring, 4 is a manhole receiving frame, 6 is a stepped part, 8 is an outer edge flange of the manhole receiver frame, 10 is an outer edge flange of the volume adjustment ring, 7, 9 is a through hole, 11 is an anchor bolt, 12 is a connection bolt, and 13 is asphalt pavement.

Claims (1)

[Scope of Claim for Utility Model Registration] A volume adjustment ring 3 for adjusting the height of a cover for an underground structure, which is installed between a support frame 4 that fits and supports the cover 1 for an underground structure, and a foundation concrete 2. , A. A ring part with an H-shaped cross section, and B. A through hole 9 for bolt insertion provided on the outer periphery of the ring part, and for tightening between the anchor bolt and the volume adjustment ring.
C. A stepped portion 6 having an outer diameter slightly smaller than the lower inner diameter of the receiving frame 4 is provided at the inner upper edge of the ring portion; 2. Further, the ring portion A volume adjusting ring for a cover for an underground structure, characterized in that an inner diameter of an inner lower edge of the ring is the same as an inner diameter of a lower part of the receiving frame 4.