【文章內(nèi)容簡介】 rect position. The elevation and plane installation error is less than 5mm. Top iron pipe axis parallel axis should with iron and symmetrical, top, and shall not have contact between rails soil, smeary。 Top iron tube nozzle should adopt the buffer material between line. In of jacking process, staff shall not in top iron, and stay above and side should be observed without anomalies at top iron signs. Confined wall is inherit and pass all the backseat wall jacking force, more should have the enough strength and rigidity, and have enough safe degrees. This project in the confined wall lining concrete design of reinforced concrete pouring on first used by steel flat, and with the delta = after 70 steel, steel and concrete planar in full 50 plank. Between lining of jacking construction technology, technical quality control measures pushing force and maximum limit measures Engineering Lord top hydraulic system work well pushing force according to the maximum allowable jacking force of 1000KN set to:. Restrictive measures for control hydraulic system pressure. When the hydraulic system pressure to achieve 10MPa, Lord top hydraulic console will alarm to meet limits maximum jacking force measures. Due to limited system pressure is lesser, when necessary, to ensure that guide pouring the concrete again under the condition of the suffers bump, don39。t move, changeless form. Guide installation the allowable deviation for: axis position: 3mm, top surface elevation: 0 + 3mm, two tracks from: ? 2mm so hydraulic system failure will greatly decrease, the reliability of pipe jacking also increase. pipe jacking rectification main techniques Rectification operation scheme should be pipe jacking driver handover key points of discussion. Plan for the measurement of the helicopter provided according to the base and folding horn, tiltmeter, front feet walking trend in reading parison, the tail subsidence quantity, etc. degrees above the big action should avoid rectify and serious debate should strive for forced in the important districts to and strengthen observation. If no rectification movement after folding Angle changes should promptly stop top, jointly with the electrician, the mechanic check circuit and hydraulic pipeline and early troubleshooting, defend axis outoftolerance. After rectifying next tube should be early, watch the tiltmeter readouts after rectifying glowing lag trend and change, at the same time inform the ground and underground pressure grouting personnel grouting quantity increased synchronization. settlement control measures points In pipe jacking before construction, is necessary to understand the pipeline or structures elevation and position. Formulate feasible protective measures, to obtain the other side recognition ability construction, ensure pipeline and fixtures safety. The ground monitoring, optimize the roadheader parameters Line every 3m above laid a settlement control pile. Through the surface monitoring get lung heavy quantity and corresponding tunneling main parameters (including the advancing speed, excavation surface soil pressure value, such as parison unearthed rate, thus optimize) after parameters, guide the se pipe jacking propulsion. 2) grouting stabilization measures In addition, in the initial propulsive phase outside, in advance parameters optimization of jacking in the process of strengthening synchronous grouting is also effective means of bentonite, must as far as possible will head of random