JP2002235331A - Connection structure between up and down blocks of built-up manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new connection structure having no crack and fracture occurring between up and down blocks of a built-up manhole. SOLUTION: The connection structure between both up and down blocks of the manhole is so constituted that a butt surface between up and down blocks of the built-up manhole is formed into a flat surface, an endless recess groove lying across both up and down blocks is provided to a middle part of the flat butt surface and that a rubber band is fitted to the inside of the endless recess groove to prevent a lateral-slip by positioning it between both up and down blocks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection structure between upper and lower blocks of an assembly manhole.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5 (a), a space between upper and lower blocks constituting an assembling manhole is a mating connection of spigot-shaped 13a, 13b having an uneven joint surface, and an intermediate meshing slope 14 is provided. A connection plate 16 is bolted to the outside of the connection portion with a rubber seat 15 for water stop and a sponge ring 18 coated or impregnated with an adhesive as shown in FIG. The connection is made in a completely fixed form, for example, by laying it in and bonding it.

[0003]

However, in places where the ground is soft, such as landfills, when liquefaction of soil or soil movement, especially when a strong impact due to an earthquake is applied, the spigot-type meshing portion of the connection portion is caused by a lateral displacement pressure or the like. There is a problem that water is leaked due to cracks or breaks in the water.

[0004]

According to the present invention, an abutting surface between upper and lower blocks of an assembling manhole is formed as a flat surface, and an endless groove is provided in the middle of the flat abutting surface so as to extend over the upper and lower blocks. A rubber ring is fitted into the endless groove to position the upper and lower blocks and prevent lateral displacement,
This problem was solved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Abutting surfaces 3 of the side walls of upper and lower blocks 1 and 2 are formed as flat surfaces A as shown in FIG. The entrances of the concave grooves 4 are formed with rounded curved surfaces 4a. Groove 4,
A rubber ring 5 having a vertically long oval shape, a gourd shape or the like as shown in FIG. The rubber ring 5 has a core made of a hard rubber 5a,
It is formed in a double structure with the water-swellable rubber layer 5b on the outside.

The flat butting surfaces 3 of the upper and lower blocks 1 and 2
A band-shaped rubber ring 7 having multiple bent portions 6 such as a W bent shape and a triple bent shape is attached to a side wall sandwiching the band 8 by tightening a band 8. 9
Is a water-swellable sealing material mounted on the inner surfaces of the upper and lower parts. At an appropriate position on the inner surface sandwiching the abutting surface 3, a joint plate 11 having a play portion 10 for bending out in the middle is fixedly attached to an anchor 12. The joint plate 11 may be replaced by a joint rubber ring (not shown). Thus, the manhole is installed at the site where assembly is required.

[0007] The upper and lower blocks 1 and 2
When a lateral displacement pressure is applied between them, the rubber ring 5 and the joint plate 11 fitted into the concave grooves 4, 4 without any load on the butting surface 3 because the butting surface 3 is flat.
This prevents lateral displacement.

[0008] Further, when a lateral displacement occurs due to a larger impact, as shown in FIG.
With a margin of 0, it is possible to easily follow, and the oval-shaped and gourd-shaped rubber rings 5 and the belt-shaped rubber rings 7 can also deform and follow each other, so that water leakage can be completely prevented within the set range. Butting surface 3
Because of the flat surface (a), it does not go through the step of slipping out first after slipping out like the spigot type, so that the burden on the followability of the rubber ring 5 and the like becomes small.
Further, since the concave grooves 4 are formed with the rounded curved surfaces 4a, the impact to the rubber ring 5 at the time of lateral displacement is dispersed, and damage and breakage can be avoided. Further, when the center core 5a is formed in a gourd shape, the dispersion of impact and the followability are sometimes promoted. Since the rubber ring 5 has a vertically long shape, it is possible to prevent water leakage with good followability even in the case where the upper and lower blocks 1 and 2 are separated from each other so as to float. Further, when a force in the opposite direction is applied due to swinging back or the like, there is also a restoring force of the rubber ring 5 or the like, so that it is possible to smoothly return to the original position.

[0009]

As described above, according to the present invention, the butt connection surface between the upper and lower blocks of the assembly manhole is replaced with a flat surface by stopping the engagement shape of the spigot. This has the effect of preventing cracking and breakage due to collision of the meshing portion.

A concave groove having a chamfered curved surface at the entrance is provided in the middle of the flat butted surface, and a rubber ring having a vertically long cross section is fitted into the concave groove which coincides with the upper and lower sides, so that the upper and lower blocks are accurately positioned. The rubber ring absorbs and absorbs the impact of the lateral displacement.

According to the present invention, when the flat surface is abutted, the spigot may be deviated laterally by an impact before the size that would damage the spigot type, but the laterally deviated state is caused by the rubber ring in the concave groove and the outer band-shaped rubber ring. Water leakage can be reliably prevented even as it is, and by observing the degree of such lateral displacement, it is possible to know the accumulation and change phenomena of underground magma, the movement or subsidence of stratum inside and outside the manhole, etc. This makes it possible to predict the occurrence of a large earthquake.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a state before butting between upper and lower blocks.

FIG. 2 is a sectional view showing a configuration of a rubber ring.

FIG. 3 is a partial cross-sectional view showing a state in which the upper and lower blocks are butt-connected.

FIG. 4 is a partial cross-sectional view showing a state where the lateral displacement has occurred.

FIG. 5 is a partial sectional view of a conventional example.

[Explanation of symbols]

 1 and 2 are upper and lower blocks 3 is a butted surface 4, 4 is a concave groove 4a is a chamfer 5 is a rubber ring 5a is a hard rubber core 5b is a water-expandable rubber outer layer 6 is a multi-bend portion 7 is a band-shaped rubber ring 8 is a band 9 is a water-swellable sealing material 10 is a play portion 11 is a joint plate 12 is an anchor 13a, 13a is a spigot-shaped butting surface 14 is a mating inclined surface 15 is a rubber seat 16 is a connection plate 17 is a bolt 18 is a sponge ring B is flat

Continued on the front page (72) Inventor Hiroshi Enami Namaka Nitta, Nakanoshima-cho, Minamikanbara-gun, Niigata (No address) F-term in Shinmei Sangyo Niigata Factory (reference) 2D047 BA21 2D063 DA17 DA19 DA20

Claims (4)

[Claims] 1. An abutting surface between upper and lower blocks of an assembling manhole is formed as a flat surface, and an endless groove extending over both the upper and lower blocks is provided in the middle of the flat abutting surface. A connection structure between the upper and lower blocks of an assembling manhole, wherein a rubber ring is fitted to position the upper and lower blocks to prevent lateral displacement. 2. The connection structure between upper and lower blocks of an assembling manhole according to claim 1, wherein the endless groove is formed by a curved surface having a square entrance. 3. The assembly manhole according to claim 1, wherein the rubber ring has a double structure of a hard rubber core having an oval or gourd cross section and an outer layer of water-expandable rubber. Connection structure between blocks. 4. A band-shaped rubber ring having a multi-folded portion in the middle between the butting surfaces of the upper and lower blocks is fastened by band tightening.
The connection structure between upper and lower blocks of an assembly manhole according to any one of claims 1 to 3, wherein a metal plate having a convexly bent play portion on the inside is anchored.