BOLSTER BASE FOR PIPING

PROBLEM TO BE SOLVED: To prevent the generation of ground subsidence or the like in a buried place by providing the upper and lower faces of a long-sized block with circular grooves corresponding to the outer peripheral surface of a protective pipe, and forming a recessed part and a protruding part to be fitted to each other, at both end parts in a bolster base used at the time of laying a plurality of underground cable protective pipes. SOLUTION: A boslter base A is formed of a long-sized block body 1 and integrally formed of synthetic resin or the like. In this case, circular grooves 11 are formed in the upper and lower faces of the block body 1. Communicating grooves 12 are formed in the center parts of the respective upper and lower circular grooves 11, and a plurality of grooves 13 intersecting the communicating grooves 12 are formed. A recessed part 14 and a protruding part 15 are formed at both ends of the block body 1, and the end parts of the bolster bases A can be connected to each other by these recessed and protruding parts 14, 15. At the time of laying protective pipe P, the bolster bases A are longitudinally laid in line inside a piping ditch formed by excavating the ground, and after connecting the end parts of the respective bolster bases A the protective pipes P are placed in the circular grooves 11, and the bolster bases A are set on the upper faces of the protective pipes P.