JPS5935647Y2 - Joint structure of manhole side block and hole ring - Google Patents

Description

[Detailed description of the invention] This invention relates to a joint structure of side blocks made of concrete or reinforced concrete that constitute a manhole.

When installing a manhole, usually a sheet pile for earth retention is constructed around it, cylindrical side blocks are piled up in the excavated hole, and the hole is backfilled with earth and sand.

However, there was a risk that the upstream mass would shift due to this backfilling earth and sand, and there were problems in terms of strength and water-stopping properties.

For this reason, conventional measures have been taken, such as providing socket-type projections and depressions on the flange portions of the upper and lower ends of each side block, into which the upper and lower side blocks fit.

However, these methods are not necessarily satisfactory because it is difficult to manufacture the side blocks using concrete and there is a risk of damage to the socket portion.

This idea was devised based on the above-mentioned circumstances, and provides a joint structure for manhole side blocks that does not have to worry about shifting due to backfilling earth and sand, and that makes it easy to manufacture side blocks and install manholes. The purpose is to

This invention will be explained below based on illustrated embodiments.

FIG. 1 is a longitudinal sectional view schematically showing a manhole, which is constructed by stacking cylindrical side blocks 1 with necessary reinforcement.

Each side block 1 has an upper flange 2 and a lower flange 3 formed integrally for joining, and bolt insertion holes 4 are provided at the same number of locations around the upper and lower flanges 2 and 3 to penetrate through the upper and lower flanges 2 and 3. There is.

An adjustment block 5 is interposed around the opening end of this bolt insertion hole 4 and tightened with bolts 6 and nuts 7 to connect and fix the upper and lower side blocks 1 and prevent displacement due to backfilling earth and sand, etc.

The adjustment block 5 has a horizontal surface for fixing the head of the bolt 6 or the nut 7, and a tapered curved surface that contacts the flange of the manhole side block 1, and is made of cast iron or the like.

Also, at the top end of the manhole, a hole ring 8 and a cover are usually placed on top of the side block 1 having a slanted wall. A taper hole 9 is provided, and a taper pin 10 is fitted into it.
It is possible to prevent the hole ring 8 from slipping and to connect it.

However, the hole ring 8 may also be joined by bolts as in the case of the side masses 1.

Further, in the figure, 11 is a step, and 12 is a joint material such as mortar.

In this embodiment, the bolt insertion hole 4 is also tapered.

This is because the inventor made it possible to use it for the joint structure using the taper pin that was developed earlier.

That is, the inventor first provided a tapered hole with an oval or circular cross section of the lower concavity that penetrates from the lower flange of the upper side block to the upper flange of the lower side block, and in this taper hole. The joint structure of the manhole side block is proposed by inserting a fitting taper pin for preventing slippage and for connection, but if it is necessary to increase the strength against shear force, the bolt joint according to this invention can be used. You can choose the joint structure according to

Furthermore, in the case of exclusively for bolt connection, the insertion hole 4 does not need to be tapered.

To construct this manhole, first install a sheet pile wall for earth retention around the manhole installation location and excavate the inside.

Then, side blocks 1 are stacked one after another inside this excavated hole, and each side block 1 is tightened with bolts 6 and nuts 7 using adjustment block 5.

Furthermore, the height of each side block 1 to be connected is 50 Qnm or 6
The area around the stacked side blocks 1 is sequentially backfilled with earth and sand, and the manhole installation work is completed.

This invention consists of the above-mentioned structure, and since a taper pin is fitted into one taper hole of the hole ring and the manhole side block and connected, repair of the hole ring whose periphery is easily damaged during use. This has the effect that simply by lifting the hole ring and removing it, it can be removed and replaced with a new hole ring easily and quickly.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; Fig. 1 is a longitudinal cross-sectional view of a manhole, Fig. 2 is a longitudinal cross-sectional view of the upper and lower mass joints, and Fig. 3 is a view taken along line I-I in Fig. 2. It is a cross-sectional view of the manhole in . 1...Side mass, 2...Top flange, 3.
...Lower flange, 4...Bolt insertion hole,
5...adjustment block, 6...bolt,
7...Natsuto, 8...Koguchi ring, 9
...Taper hole, 10...Taper pin, 11...Step, 12...Gout material.

Claims (1)

[Scope of utility model registration request] The upper part of the manhole is made by stacking cylindrical manhole side parts each having a connecting flange integrally formed at the upper and lower ends, and a taper hole is provided in the upper flange of the manhole, and a taper hole provided in the hole ring is attached to the upper part of the manhole. A joint structure of a manhole side block and a hole ring, characterized in that the tip of a taper pin inserted so as to penetrate the hole is inserted to connect the manhole upper side block and the hole ring.