Development Of Large-diameter Pipe Jacking And Key Technology Research

Trenchless technology is a kind of new-type practical technology,which is combined the advanced science and technology with society demand.Generally speaking,trenchless technology is a set of technologies for the installation,repair and replace the pipelines.It can well work with modernized machine in the condition of no-digging or just digging a small work pit.Therefore it has advantages with its high efficiency,superior quality,just right cost and environmental preservation.On the base of analysing the princpicle of pipe jacking,The paper detailed calculation of pipe jacking in various loads,especially to the key parameters such as cutter torque,corrective force of hydraulic cylinder group,screw conveyor.On the basis of this developed DK3600 earth press balanced pipe jacking machine.This paper constructs the earth press balanced with the advantage of simple construction,favorate adaptation,convenient operation and high efficiency.Through the development process of the analysis of key technologies as well as specific research,the following major conclusions can be drawn:1,The development of Large-diameter pipe jacking machine is a complex systems engineering,mainly related to maximum machine power system design,the cutting plate design,sealed system design,hydraulic system design,such as correcting the key technology.2,Electric system adopts PLC control,which greatly improved the reliability,ease of maintenance,failure diagnosis and maintenance are convenient.At the same time,in the electric control unit adopts the soft starter to control the multi-motor work,solved the multi-motor successively startup problem. 3,Hydraulic oil cylinder arrangement of rectifying generally adopted 4 diagonal "□" form.Each group of hydraulic cylinders,decorate 2 only four cylinder distribution in a circle.Deviation in group 2 cylinders when working at the same time, effective use of the hydraulic power.4,Based on the above characteristics of the subjects developed erath press balanced DK3600 Pipejacking can reach the top diameter 3600mm steel pipe.Strong power,high cutting force of the soil,wide application range,can be reliable in engineering construction.5,None of the top panel cutter boring machine used tube cutter spokes-type structure,its opening rate is 100%,realize the real meaning of earth pressure balance.Due to the development of the machines,it will bring enormous economy and society benefit to our society.