PROBLEM TO BE SOLVED: To provide a construction device having a simple structure and capable of inserting a roll deeply and constructing an impervious wall having large depth based on a precondition of use of an impervious sheet roll wound like a roll.;SOLUTION: The sheet roll 1 of an impervious sheet S using a female joint 2 and an extension rod 26 in its upper part as core members is supported on a roll intrusion post 11 supported on a leader mast so as to elevate at standing-up straight attitude. The sheet roll 1 is selectively supported by a gripper mechanism 24 capable of gripping it rotatably and a gripper mechanism 25 capable of gripping it so as to prevent rotation in addition to a roll receiving bracket 20 with a positioning pin 21 in a lower part. It is intruded into the ground in a rotation impossible condition, its grip is changed into a rotation possible condition, and it is left in the ground after deploying the impervious sheet S.;COPYRIGHT: (C)2007,JPO&INPIT
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