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• Time of issue:2020-09-18 10:20
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(Summary description)Generally speaking, the pipe jacking machine works in parallel lines, pushing the following pipes to be installed, and the pipe jacking machine can also push in a curve. The curved pipe jacking mainly uses four groups of eight installed in the pipe jacking machine. The hydraulic jack for the curve turning is completed by different jacking in. The hydraulic jacks are arranged symmetrically on the diameter at an angle of 45° to the vertical. The pipe rotation can be completed by simply adjusting the stroke arrangement difference between the upper and lower hydraulic jacks. Generally in hard soil, if the plug is pushed along the curve of the design plan, the pipeline will follow the curve of the movement trajectory of the plug afterwards. However, if the soil layer is too soft, the soil will not have sufficient axial force on the post-tube shape of the head, so that the gap between the post-tubes will not form the gap between the upper and lower sides of the pipe, and the curved pipe jacking will not be successful. In the second time, it is necessary to bury the bending hydraulic jack box at the top of the subsequent pipe sections that matches the top bending hydraulic jack, and when opening the pipe seam, insert a small hydraulic jack to force the pipe seam on both sides of the curve to be forced to open the pipe indirectly. The sex seam produces a pipe seam difference consistent with the top head, and artificial board is inserted into the stretched seam to fill. The plug and the pipe after the occurrence of the pipe gap difference produce a "composition turn" and then the pipe culvert behind it will push forward along the movement trajectory of the "composition turn", resulting in a curve jacking of all the pipelines. According to the construction plan of the pipe jacking machine, the production of the pipe jacking curve depends on the poor stroke arrangement of the curve hydraulic jack and the reaction force of the soil on the head and the pipe culvert. If the pipe jacking axis rotates to the right, if the 2 sets of hydraulic jacks on the right are more jacked, and the 2 sets of hydraulic jacks on the left are less jacked, the head of the jacking machine will shift to the left. The size of the stroke arrangement difference between the upper and lower sides of the hydraulic jack depends on the size of the curve turning radius, and is adjusted according to the line measurement result. With the described method, the plug head can be turned up, down, left and right at will to complete the curved pipe jacking.