The earth pressure slurry pipe jacking machine jacking construction method of jacking tunnel construction method is using earth pressure balanced rectangular pipe jacking machine complete the rectangular cross section, the cross section structure can reduce the rationality of land requisition and excavation area, reduce the construction cost. The utility model can be used for building subway stations, subways and underwater tunnels, side passages, etc..
1. features
1.1 using the earth pressure balanced rectangular pipe jacking machine, the rectangular section can be cut in full section to maintain the balance of earth pressure and the disturbance of surrounding soil is small.
1.2 in the same section area, rectangular tunnel can make more effective use of space than circular tunnel, and reduce underground excavation earthwork. The underground passage for pedestrian, vehicle, etc. needs no further ground preparation procedure, which saves time and reduces the construction cost by about 20%.
1.3 does not affect the original types of underground pipelines, does not affect road traffic, water transport and the ground floor of various buildings. No noise or environmental pollution during construction.
1.4 through the programmable logic controller program and various sensors to monitor the construction conditions, determine the construction parameters, the whole construction process in a controlled state, so as to effectively control the rectangular tunnel axis, jacking angle deviation and ground settlement.
2. working principle and scope of application:
2.1 working principle:
The control system of the earth pressure balance for the working principle, through the broadsword plate and a profiling knife on the positive soil whole section cutting, rotating speed change spiral machine and jacking speed to control the amount of dumping, the soil stability and control in the set pressure value range of pressure value of earth pressure in the cabin, so as to achieve the stability of soil excavation cutting surface.
2.2 scope of application:
The method is suitable for construction in clay, silty clay, silty sand and sandy silty soil. The utility model is especially suitable for the construction of rectangular sections under various underground pipelines which are not suitable for large excavation, so as to ensure that the building on the ground is not damaged.
3. benefit analysis
3.1 compared with the circular pipe jacking, there is no waste of excavation area, and make full use of the structural cross-section, so that the underground space has been effectively utilized. Underground tunnels, such as pedestrian, vehicle, and so on, do not need to be paved again. They can save a lot of time and money.
3.2 and box culvert jacking compared, because the control of earth pressure balance, small disturbance to the soil, can effectively control the surface subsidence and uplift, pipeline construction in the downtown area or building intensive situations, greatly reducing the ground and underground structures damage losses.
3.3 in the road and railway, tunnel, river pipeline construction, cannot use the slotted pipe construction, using rectangular pipe jacking machine can ensure traffic, greatly reduced due to the construction of roads, has significant social and economic benefits.
