MANHOLE BODY BLOCK APPLIED TO SMALL-BORE PIPE JACKING AND METHOD OF MANHOLE CONSTRUCTION

PROBLEM TO BE SOLVED: To shorten the period of manhole construction works, to reduce construction cost, to scale down an area exclusive for construction works, to prevent intrusion into a manhole of water and soil and sand at the time of face cutting at the time of starting small-bore pipe jacking construction method, to use the departure shaft and arrival shaft of the method of small-bore pipe jacking construction in a manhole body block in combination, to increase joint strength and to improve aseismicity, etc. SOLUTION: A guide cotter is fitted and a bolt mounting hole is formed at the upper end section of an annular member 22 made of a metal in the manhole body block 2, a reinforcing member is fixed onto the annular member 22, and the reinforcing member is buried at a periphery at the upper end section of an annular block 20. A blade-shaped member 21 is installed at the lower end of the manhole body block 2, each element is manufactured integrally in a manhole manufacturing process, a through-hole is bored to the wall of the manhole body block 2, and a cutoff instrument 3 is fixed into the through- hole.