JPH10266317A - Earthquake-proof protection method for manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a manhole free form water leakage, slippage and earth entrance on an occasion of earthquake by a method wherein a sealing material is put in a jointing part between the upper and the lower side blocks of the manhole and a thin steel collar with a cushioning material provided at the inside is fitted externally with sealing materials attached to the upper and the lower edges thereof. SOLUTION: A side block 1 is laid at the top of a side block 2 for a manhole with a main sealing material 3 made of butylene rubber, epoxy resin or the like inserted into a socket and spigot joint A of the manhole. A thin steel collar 4 with cushioning materials 5, 5 provided on the upper and the lower parts at the inside thereof is fitted externally to the joint A while sealing materials 6, 6 are attached with a gun to the upper and the lower edges thereof, and thereby an external sealing part is formed. With the manhole structured in such a structure, leakage can be prevented by the external sealing part of the collar 4 even in the case where the main sealing material 3 loses its function with the manhole side block 1 raised entreaty or partly at its one side because of an earthquake with intensity at a certain level or above. In the case where the joint A is broken in a horizontal slippage with a force applied horizontally, the slippage can be retained within the scope of inner diameter of the collar 4, dispersing the external force to the joints A at the upper and the lower parts, thereby preventing water leakage and earth entrance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-resistant manhole protection method for preventing sediment from flowing in from a joint at the time of an earthquake in a manhole for water supply and sewerage in which concrete blocks are stacked.

[0002]

2. Description of the Related Art The joints of concrete-side masses of manholes constructed by stacking conventional concrete-side masses are not flexible and can be used up to a certain seismic intensity (level I) by the current spigot type connection method. However, if the seismic intensity exceeds that, the joints will shift, leaking inside the manhole, and if the seismic intensity further increases, the joint near the maximum stress will be broken, sediment will flow into the manhole, and the function as a manhole Has been lost. Also, as shown in FIGS. 1 (a) and 1 (b), if the outside or inside is fixed with a connecting metal, or if the joint is completely fixed with an adhesive as shown in FIG. It became a structure, and the manhole itself could be destroyed by the external force during the earthquake, and it was difficult from the economic point of view to satisfy the strength.

[0003]

SUMMARY OF THE INVENTION According to the present invention, even when the seismic intensity is equal to or more than a certain level, the displacement of the joint and the dispersion of the stress can be achieved, and the joint of the product and the strength of the product can be installed as before. It is an object of the present invention to provide a method for protecting manholes against earthquakes, for which economic efficiency and reliability can be greatly expected.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a protective collar having flexibility and waterproofness is provided outside a joint. .

That is, according to the present invention, a protective collar made of a thin metal plate is provided, in which a concrete side lump is laminated with a main sealant interposed between joints, and external seals are provided on the outside of the joint at least above and below the inside. It is designed to fit in a hoop shape.

[0006]

FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. In FIGS. 1 and 2, reference numerals 1 and 2 denote a main sealing material 3 such as butyl rubber or epoxy resin sandwiched between joints of a spigot joint A. The concree and the side lumps.

4 is a cushioning material such as rubber at
5 is a thin steel collar fitted to the outside of the spigot joint A, and then the upper and lower edges of the sealing material 6, 6 with a gun.
To provide an external seal portion.

In the manhole constructed as described above, even when the manhole-side lump 1 rises as shown in FIG. 3 when an earthquake of a certain seismic intensity or more occurs, as shown in FIG. Even if it floats up, the external seal portion of the protective collar 4 prevents water leakage even if the main seal material 3 loses its function.

Also, as shown in FIG. 5, even when a lateral displacement occurs due to an external force applied to the manhole from the horizontal direction and the joint is damaged, the displacement is set within the range of the inner diameter of the collar, and the upper and lower joints are formed. Disperses external force and prevents water leakage and inflow of sediment.

[0010]

According to the present invention, it is possible to measure displacement and dispersion of stress at each joint of the manhole side lump, and it is possible to install the product joint and the product strength as before, and it is possible to maintain reliability in response to an earthquake. The construction of the manhole side lump only needs to be used with the simple structure of the protective collar in combination with the conventional structure. It was a winning method.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing various conventional manhole earthquake countermeasures.

FIG. 2 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing one state during an earthquake according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing one state during an earthquake according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing one state during an earthquake according to the embodiment of the present invention.

[Explanation of symbols]

 1, 2 manhole side lump 3 sealing material 4 steel collar 5 cushioning material 6 sealing material

Claims (1)

[Claims] [Claim 1] A concrete side lump is laminated on a joint portion with a main seal material interposed therebetween, and a protection collar made of a thin metal plate provided with an external seal material at least on the upper and lower sides of the inside of the joint portion is formed on the outside of the joint portion. A seismic manhole protection method characterized by fitting.