PURPOSE: To simplify the execution enhance the efficient and enable an assembling pit to withstand load such as soil pressure or transport pressure by constituting a pit main body of divided pit members made of a fiber reinforced resin and providing necessary strength to a joint part.
CONSTITUTION: An almost U-shaped pit main body 1 is constituted of two left and right divide pit members 2 for side panels, two left and right divided pit members 3 for corners and a divided pit member 4 for a bottom panel and all of the members 2, 3, 4 are made of a fiber reinforced resin. Core materials 10 having compression modulus of 10kg/mm2 or more are embedded in the protruding edges 6, 8 made of a fiber reinforced resin of the divided pit member 2, 3. Therefore, the mutual joint parts of the divided pit members 2-4 have necessary strength. By this constitution, execution can be simply and efficiently performed and the pit main body 1 can withstand load such as soil pressure or transport pressure.
YOSHIDA KOZO
SHINOBU MASAYASU
NISHIGORI MITSUNORI
HIGASHI NIPPON RYOKAKU TETSUDO