| 摘要 |
PURPOSE: A drag head is provided to have the high efficiency by changing and improving an existing drag head, and to increase the sandy concentration of an inhaled and supplied mixed material than existing other things, and a device is provided to individually control a water gap from a cut thickness. CONSTITUTION: A drag head for a pulling typed dredger of inhaling hopper is moved on a bottom in a direction of an arrow(P), and installed in the front end of an inhaling pipe installed in a visor(2) having a upper plate(4) formed a side wall (3), a rear wall(3') and a circular forming portion(5). When the visor is rotated centering a shaft(6), the circular forming portion(5) is maintained the contact with a sealing strip(7) belonged to a fixing portion installed in the inhaling pipe. Many front jetting pipes(9) to jet water with high pressure is penetrated a terminal plate(9). The jetted water is dispersed a sand while the drag head dredges on the bottom, and the dispersed sand is inhaled at once. At the same time, a tooth projection(10) installed in the rear of the front jetting pipes(9) smashes the sand. Serial rear jetting pipes is installed in the rear of the tooth projection(10) in the height of a water valve(11) to close the visor from the rear side. The rear jetting pipes is separated to a first jetting pipe(12) faced to the tooth projection and a second jetting pipe faced downward vertically. Jetting water jetted through the first jetting pipe(12) is faced inward the visor, and the second jetting pipe(12') flows the sand bottom deeply in the height of the rear wall(3').
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