JOINT SEAL OF STEEL ELEMENT FOR CONTINUOUS UNDERGROUND WALL

PURPOSE:To prevent concrete or the like from sticking to joints, by providing a groove containing the joints of steel elements and a contact face formed to correspond with the shape of an interlocking pipe, in a belt. CONSTITUTION:A joint 41 of a steel element 40 is contained in a containing groove 32 of a joint seal 30 and the seal 30 is attached along the joint 41. Next, after the element 40 has been equipped in the state that the seal is fitted thereto, the interlocking pipe 20 is installed within an excavated groove 50 so as to contact the contact face 327 of the seal 30. Next, concrete is placed in the element 40 and cured, and then the pipe 20 is pulled out and the seal is removed. The groove 50 is excavated and the element 40 is arranged in the groove 50 and further, the joint 42 without attached seal 30 is connected to the joint of the element 40 in the excavated groove 50. Moreover, after the pipe 20 has been erected, the same process is repeated to construct a continuous underground wall.