PURPOSE: To ensure safety of worker, by driving a fixed frame through an anchor bolt driving machine mounted on a truck into the ceiling of a culvert and feeding a cable from a drum and laying the cable in the fixed frame thereafter traveling the truck in a sewer culvert while monitoring the truck with a camera.

CONSTITUTION: An anchor bolt driving machine 1, a drum wound with cable 4 and a camera unit 7 are mounted on a truck 3, then the truck 3 is traveled to a predetermined position by means of a battery and a program contained in the truck 3. Then a fixed frame 5 is driven through the anchor bolt driving machine 1 into the ceiling 6 of a culvert, thereafter the cable 4 is fed from the drum 2 and laid in the fixed frame 5. The truck 3 is moved to next predetermined position according to the program with the condition thereof being monitored with the camera 7, thus repeating the laying work. By such arrangement, safety of worker is ensured and the efficiency of laying work is improved.