Abstract: There is provided a temporary restoration member (lining mats (1), nonslip pins (2), lock pins (3), stoppers (4), fixing pins (5)) for simplifying the construction work for temporarily restoring a road surface when a paved road surface (B) is excavated to lay piping, and a method for restoring the road surface using the member. Each of the lining mats (1) is a rectangular rubber plate provided with a thick central part (11), two thin side parts (12), and pinholes (16) at appropriate locations that pass through the mats from the front surface to the reverse surface. The lining mats are laid out to cover a backfilled surface so that the side edges of the mats are disposed on the paved road surface (B). Cylindrical nonslip pins (2) are driven into the pinholes, and lock pins (3) are driven into the cylindrical part of the nonslip pins to fix the lining mats. Latching protrusions (42) of stoppers (4) are inserted into the pinholes to connect adjoining mats.

Abstract: An air relief device for use in a liquid flow pipe comprises an outer housing fixed to a large-diameter air outlet formed in a portion of the pipe arranged at an elevation, an inner housing rotatably fitted snugly in the outer housing, a float accommodated in the inner housing, and a lid member having a valve port and adapted to be put on the inner housing. The outer and inner housings have through holes bored therein respectively and allowed to coincide exactly with each other. Fluid communication or severance of the fluid communication between the pipe and the inner housing can be obtained by rotating the inner housing to vary the relation in position between the through holes in the outer and inner housings.