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An excavator for constructing an underground continuous wall includes a traveling trolley movable on rails and having a sprocket in mesh with a rack extended parallelly to the rails and a hydraulic motor for driving the sprocket. The trolley further includes an upper frame arranged thereon and havin

An excavator for constructing an underground continuous wall includes a traveling trolley movable on rails and having a sprocket in mesh with a rack extended parallelly to the rails and a hydraulic motor for driving the sprocket. The trolley further includes an upper frame arranged thereon and having a tiltable frame tiltable relative to the upper frame and a saddle provided on the tiltable frame slidable on the tiltable frame in directions substantially perpendicular to the rails. An extensible guide post is provided upward and downward movably relative to the tiltable frame. An endless chain extends around a chain driving wheel provided on the saddle and a chain sprocket provided at the lower end of the guide post, and a number of cutter bits and a number of agitator bars are alternately arranged on the endless chain to form an endless chain cutter. A chain driving device is provided for driving the endless chain.

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An underground continuous wall construction method utilizing an excavator comprising a traveling trolley movable on rails and having at least one sprocket in mesh with a rack provided on the rails, driving means for driving the sprocket, an upper frame arranged on the trolley, a tiltable frame pivot

An underground continuous wall construction method utilizing an excavator comprising a traveling trolley movable on rails and having at least one sprocket in mesh with a rack provided on the rails, driving means for driving the sprocket, an upper frame arranged on the trolley, a tiltable frame pivoted at its lower portion to the upper frame, a chain driving wheel on a saddle on said tiltable frame, means for sliding said saddle on said tiltable frame in a direction substantially perpendicular to the rails, an extensible guide post vertically supported by the tiltable frame and positioned below the chain driving wheel, a chain sprocket rotatably connected to the lower end of the guide post, an endless chain extending around the chain sprocket and the chain driving wheel, and a number of cutter bits and a number of agitator bars alternately arranged on the endless chain to form an endless chain cutter; said method comprising the steps of digging a hole in the ground to a predetermined depth by means of a drilling device, inserting the endless chain cutter of the excavator into the hole, and excavating the ground in a predetermined direction by means of the endless chain cutter, while jetting a hardening liquid in the excavated hole, thereby mixing the hardening liquid with the earth and sand in the excavated hole to form a soil cement wall.