SEALANT FOR WATER STOP INSTRUMENT

PURPOSE:To simplify work by providing a hole for a lead pipe on a central part of a sealant for a water stop instrument, providing a groove on its outside and making a hole for a buried pipe by way of clipping it in the case of execution work of the buried pipe by a small aperture propulsion construction method. CONSTITUTION:Lead pipes 10 are constructed by sequentially inserting and connecting them into a central hole 14A of a sealant 14 of a water stop instrument 3 and drilling and propelling by a drilling head 9 and a drilling machine 8. Thereafter, a large hole to construct a buried pipe 13 is made by cutting off a groove B of the sealant 14 with a knife, etc. Continuously, a drilling cutter 11 and a screw 12 to transport waste soil are connected to the last end of the last lead pipe 10, and the screw 12 is propelled by the drilling machine 8. Additionally, the buried pipe 13 is propelled while sequentially supplying the buried pipes 13 of unit length into a large diametrical hole of the sealant 14 and connecting the screws 12 of unit length. Consequently, it is possible to easily structure the sealant, to do it inexpensively and to easily carry out site work.