JPH03111699U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a segment sealing material showing a first embodiment of this invention, and FIGS. 2 to 5 are
FIG. 6 is a partial sectional view of the segment sealing material showing the second to fifth embodiments of this invention, and is an explanatory view of the action of the sealing material in the first embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Segment, 2... Water stop groove, 3... Outer periphery contact surface, 5... Expandable material, 6... Non-expandable material, 7
... Sealing material, H ... Height of expanding material, h ... Height of non-expanding material.

Claims (1)

[Scope of utility model registration request] Water stop grooves having a concave cross section are formed on the outer circumferential contact surfaces of the plurality of segments constituting the prefabricated tunnel, and each of the water stop grooves is provided with an expandable material having a property of expanding in volume by absorbing moisture; In a segment sealing material each comprising a sealing material made of a rubber-like elastic body laminated with a non-expandable material having a property that its volume does not substantially change even when it comes into contact with moisture, the expansion constituting the sealing material The side part of the material is configured to be surrounded by a non-expanding material, the cross-sectional area of the sealing material is set to be less than the cross-sectional area of the water-stopping groove, and the height of the sealing material is set to be equal to or greater than the depth of the water-stopping groove, and When the non-expandable materials with the same cross-sectional area are butted and compressed, the contact area pressure of the butting surfaces is equal to the fluid pressure to be sealed at the maximum design opening amount of the segments. A segment sealing material characterized by being configured as described above.