The present invention relates to the press-type protective tube for installing a system for measuring the pore water pressure in the water pressure within the gap between soil in the soft ground, soil, The tubular been pitched ball is perforated at regular intervals on the outer peripheral surface the housing and, by entering into the concave inlet at the entrance to the housing lower side constituting a conical cone, a rod intended to lower the housing into the borehole and a connection port comprising the connecting device for inducing a smooth press-fitting using a press-fit type protective tube by naeseol the pore pressure based on the inside, prevent damage and malfunction caused the pore water pressure system and sandbags on the external soil pressure, and can accurately install the hydraulic system clearance for installation measuring the depth of wonjiban by preventing disturbances related to pore pressures based press-fitting way that the protective tube to obtain accurate measurements. In addition, protecting the pore pressure system, and the primary filter role coat the P and D and B of the ballast to perform: a gap that prevents the loss of the filling sand by applying a (Paper Drain Board trade name), and put inside gizzard in the hydraulic system to which the filter side is possible to solve the problem of unsaturation due to the bubbles generated in the sensor by the sensor installation position to the image side.