To assemble and disassemble temporary coffering works simply and rapidly.

Temporary coffering works have a plurality of precast panels 20 being parted along the vertical direction and peripheral direction of a pier and having the same constitution. The panel 20 has a skin plate 20a, a plurality of vertical beams 20b, a pair of cross beams 20c and a plurality of vertical ribs 20d. The plates 20a are bent circularly, formed in a cylindrical shape when they are connected in the peripheral and vertical directions, and part the outer circumferential surface of the coffering works. The vertical beams 20b are arranged at both ends in the peripheral direction of the plate 20a and the central section of the plate 20a, and fixed in the vertical direction of the internal surface of the skin plate 20a. A pair of the cross beams 20c are composed of an arcuate plate, and fastened onto end faces in the vertical direction of the plate 20a and the vertical beams 20b. The cross beams 20c are formed in an annular shape when the panel 20 is coupled in the peripheral and vertical directions. The inserting holes 20e of fixing anchors are penetrated and formed to each cross beam 20c.