当通讯电缆敷设遇到建筑物或铁路、公路时,常依靠顶管机使通讯电缆穿越上层。现有的双缸顶管机有一对并列液压千斤顶,利用千斤顶的推力将电缆夹持顶进土层。但这种顶管机容易出现两个千斤顶不同步而顶偏的现象,且机组笨重,操作不便。 When a communication cable is laid on a building or on a railway or a road, it often depends on the pipe jacking machine to make the communication cable run through the upper layer. The existing double-cylinder jacking machine has a pair of juxtaposed hydraulic jacks, and the jack thrust is used to push the cable into the soil layer. However, such jacking machines are prone to the phenomenon that the two jacks are out of sync and topside, and the crew is cumbersome and inconvenient to operate.