| 摘要 |
<p>PURPOSE:To ensure and make proper the flow of a bulk material by providing a high water-absorbing resin supply line as well as a mixer and pipes, etc., for earth and sand, and the like and controlling the pressure in an earth pressure chamber by the opening/closing of valves in accordance with the output of a control means based on a detected pressure value. CONSTITUTION:A segment 3 is formed in the rear of a shield excavator 1 having a cutter drum 2, and an excavating speed is calculated by means of a jack stroke meter 29 and an excavation controller 26. An earth pressure chamber 6 is formed in the rear of the drum 2 while opening the discharge ports of injection pipes 7 in the front to discharge out a high water-absorbing resin, which is mixed with and gelatinizes the earth and sand in both working face and earth pressure chamber 6. A discharge port is connected to an earth/sand discharging conveying pipe 9, the rear portion of which is connected to a fine-particle storing portion, and a high water- absorbing resin supply line 12, a conveying pump 13, an air compressor 14, an injection control device 15, a mixer 16, a fine-particle conveying pipe 18, etc. are provided in the segment 3. Thereby, excavation can be carried out by means of a shield tunneling method even with a ground having a large water content.</p> |
