JPH0455099Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention prevents the lid holder frame from shifting due to the vibrations of vehicles passing on the road surface, and prevents the entire manhole block from shifting or being damaged even if a large force is applied to the lid holder frame. This invention relates to a fixing structure for a manhole cover frame that does not receive any damage.

[Conventional technology]

As shown in Figure 2, manholes for wiring such as sewage, telephone lines, and power distribution lines are usually made by stacking two to three tiers of cylindrical manhole blocks 1 made of concrete, and then placing a conical manhole block made of concrete on top of the slanted manhole blocks. 2, and then a short cylindrical height adjustment adjustment ring 3 made of concrete is stacked on top of it, and a lid holder frame 4 made of iron is placed on top of this, and the lid holder frame 4 is placed on top of it.
It is assembled by fitting the lid 5 to the.

A plurality of cylindrical manhole blocks 1, inclined manhole blocks 2, and adjustment rings 3 are joined with mortar, and a lid receiving frame 4 and a lid 5 are placed thereon.

However, as the amount of automobile traffic on the road increases, the vibration may cause the lid holder frame 4 to shift, and in order to prevent this, Japanese Patent Publication No. 59-48258 installed an embedded plug in the inclined manhole block. A fixing method has been proposed in which the adjustment ring and the lid holder frame are integrally fastened.

[Problem that the invention attempts to solve]

If the slanted manhole block, adjustment ring, and lid holder frame are fastened together as described above, there is no risk of the lid holder frame shifting due to vibrations caused by vehicle traffic. When the earth removal plate touches the manhole cover frame, a large lateral force is applied to the cover frame, causing the entire lower manhole block to shift sideways.
There is a risk that an accident may occur that would require the entire manhole to be repaired.

Therefore, the present invention prevents the manhole cover frame from shifting due to vibrations from passing vehicles, and prevents the lower manhole block from shifting even if a large lateral force is accidentally applied to the cover frame during road construction. The purpose of the present invention is to provide a fixing structure for a manhole cover frame that does not cause problems.

[Means for solving problems]

As a result of repeated research by the present inventor in order to achieve the above objective, by tightening only the adjustment ring of the manhole and the cover holder frame with bolts with buffer washers in between, the cover holder frame will not shift due to vibrations caused by vehicle traffic.
They also discovered that the lower manhole block does not shift even if a large force is applied to the lid holder frame, leading to the completion of the present invention.

Next, the content of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of the fixing structure of the manhole cover frame of the present invention. 6 is the topmost manhole block of the stacked manhole blocks, and is usually an inclined manhole block consisting of a truncated conical taper cylinder that tapers at the top. Although often used, it may also be a cylindrical manhole block.

A shallow cylindrical height adjustment adjustment ring 3 is stacked on top of the topmost manhole block 6 with a ring packing 7 made of an elastic plate such as butyl rubber interposed therebetween. The adjustment ring 3 is a concrete ring that adjusts the height so that the top surface of the manhole cover is flush with the road surface, and a ring with an appropriate height is selected depending on the height to be adjusted. If complete watertightness is required, a caulking agent such as silicone rubber may be used together with the ring packing 7. A plurality of fitting holes 10 are provided in the upper surface 8 of the uppermost manhole block 6 and the lower surface 9 of the adjustment ring 3 at positions that coincide with each other, and the engagement pins 11 are inserted into these holes by passing through the ring packing 7. match. The engagement pin 11 may be screwed into or embedded in one of the upper and lower fitting holes 10.

Instead of the above-mentioned fitting hole 10 and engagement pin 11, an annular groove may be provided on one of the upper surface 8 of the uppermost manhole block and an annular projection on the other side of the lower surface 9 of the adjustment ring 3, and the two may be fitted together. Further, annular step portions that fit into each other may be provided on the upper surface 8 and the lower surface 9.

A plurality of embedded plugs 12 are embedded in the adjustment ring 3 so that the upper end surface is exposed on the upper surface. The lower end of the embedded plug 12 is bifurcated, and a female threaded hole 13 is formed vertically from the upper end.
is provided. The number of embedded plugs 12 is not particularly limited, but 3 to 6 plugs, preferably 3 to 4 plugs, are buried at equal intervals. A bolt 14 is screwed into each female threaded hole 13 of the embedded plug 12, and one to several buffer washers 15 are fitted onto each of the bolts 14. The buffer washer 15 is a metal plate 16 with an elastic plate 17 made of rubber or the like bonded to at least one side of the metal plate 16, and a rubber plate affixed to one side of an iron plate, or one in which the entire iron plate is covered with rubber is used. Instead of joining the metal plates 16 and the elastic plates 17 in advance, the metal plates 16 and the elastic plates 17 may be stacked alternately and fitted onto the bolts 14.

Bolt hole 1 is inserted into bolt 16 set up on adjustment ring 3.
8, place the lid holder frame 4 on the adjustment ring 3 with the buffer washer 15 in between, and tighten the lid holder frame 4 with the nut 19.
is fastened to the adjustment ring 3, and the lid 5 is fitted onto the lid receiving frame 4. By adjusting the number of buffer washers 15 that fit onto the bolts 14 and selecting the height of the adjustment ring 3,
Adjust so that the top surface of the road surface is on the same level as the road surface. When the road surface is sloped, the number of buffer washers 15 fitted to each bolt 14 can be changed accordingly to make the upper surface of the lid 5 match the slope of the road surface.

[Effect of idea]

According to the fixing structure of the manhole cover holder frame of the present invention, the adjustment ring and the cover holder frame are fastened with bolts while sandwiching the buffer washer attached with the elastic plate, so that the adjustment ring and the cover holder frame do not shift and can be easily accessed by vehicles. Since the vibration caused by this is absorbed and alleviated by the buffer washer, the space between the adjustment ring and the uppermost manhole block will not shift laterally due to the vibration of normal vehicle traffic. In addition, the top manhole block, adjustment ring, and lid holder frame are not directly bolted together, so if a large lateral force is applied to the lid holder frame during road construction, etc., the lid holder frame and adjustment ring The chisel shifted sideways all together,
Since the manhole blocks below the topmost manhole block do not shift, it is possible to prevent an accident in which the entire manhole needs to be repaired.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the fixing structure of the manhole cover frame of the present invention. FIG. 2 is a sectional view of a conventional manhole. Explanation of symbols, 1...Cylindrical manhole block, 2...Slanted manhole block, 3...Adjustment ring, 4...Lid receiving frame, 5...Lid, 6...Top manhole block, 7...Ring packing , 8...
...Top surface, 9...Bottom surface, 10...Fitting hole, 11...
Engagement pin, 12...embedded plug, 13...female screw hole,
14... Bolt, 15... Buffer washer, 16... Metal plate, 17... Elastic plate, 18... Bolt hole, 19
...Natsuto.

Claims (1)

[Scope of utility model registration request] In a manhole constructed by sequentially stacking a cylindrical or conical manhole block, a shallow cylindrical adjustment ring for height adjustment, a lid receiving frame, and a lid, an embedded plug with a female thread is embedded in the top surface of the adjustment ring. One or more buffer washers made of a metal plate with an elastic plate attached to at least one side are sandwiched between the adjustment ring and the lid holder frame, and the buffer washers are inserted through the bolt holes of the lid holder frame. A fixing structure for a manhole cover frame, characterized in that the cover frame is fastened to an adjustment ring by screwing a bolt into the embedded plug.