| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel molding box for producing concrete bottom frame in molding box for manufacturing concrete segment, which can be configured at low cost as far as possible and with which the manufacturing cost of a concrete segment for shield tunnel finally manufactured is reduced. SOLUTION: The steel molding box for producing the bottom frame of the molding box for manufacturing four kinds of concrete segments of A, B1, B2 and K types by using concrete includes a bottom plate having a recessed arcuate surface coincident with the inner circumferential surface of the segment, and side plates and edge plates fixed to edge surfaces of the four circumferences of the bottom plate. For the bottom plate, three kinds of an isosceles trapezoidal K type compatible standard bottom plate 1022 coincident with the K type segment, a trapezoidal B type compatible first standard bottom plate 1024 of which the two angles are right angles respectively and one side coincides with the oblique line of the K type compatible reference bottom plate and a trapezoidal B type compatible second reference bottom plate 1026 symmetrical with respect to the B type compatible first reference bottom plate are prepared viewed from above. COPYRIGHT: (C)2011,JPO&INPIT |
