Study On The Turning Counterforce Relationship With Resistance Block Height And Rings Of Self-drive Excavating Machine

In recent years, with the acceleration of urbanization, widely and reasonably use of underground space becomes the theme of urban development in the 21st century. Shield and pipe jacking method as two major trenchless technology in underground engineering construction has developed more and more important role, but the shortcomings of the two technologies are also increasingly obvious, the forward depends on segment linings or back wall to offer for its artificial reverse force, often difficult to meet the long distance, urgent curve underground engineering requirements and therefore need a excavating machine that can walk itself and urgently turningr. This article carries on field turning test research based on improved self-drive excavating machine which is designed and processed again.This paper introduces the research status of the current trenchless technology such as shield machine and top pipe bender, develops research around shield machine and top pipe benders'turning mechanism, and puts forward the turning mechanism and implementation mode of self-drive excavating machine. Though the theoretical analysis of turning resistance of excavating machine, deduce the push force calculation formula in the process of turning, and calculate the theoretical push value of excavating machine in the condition of different turning angles. In the field test process, propping up height of resistance block, propping up ring number, combination mode of different rings, super dig quantity, surveying control and rectification measures, are the main factors of affecting turning of excavating machine. Make sure these factors as the main research contents, in the process of turning concluding push pull relations and the influence to surrounding soils, controlling normal turning.Research adopts the method of field test, the walking process of improved self-drive excavating machine is divided into five stages, respectively for the five stages, collect data, do result analysis and study push pull relations in different stages and the best resistance block combination mode in completely walking by itself stage.There are several conclusions as follows obtained from the research:(1) The first tube of excavating machine going forward needs 3 tons tension, the second one needs 12 tons tension, the third one needs 13.2 tons pulling force, the fourth one needs 3.8 tons pulling force;(2) The propping up height increases with the increasement of air pressure value, when the air pressure is 0.3MPa, the resistance block has basically achieved maximum of average supporting height;(3) The bigger the resistance block supporting height, the greater forward force it can provide, when the propping up height is at 55 mm, it can offer 14 tons forward force to excavating machine;(4) The more the rings of resistance block propping up, the greater forward force it can provide, under the condition of different rings combination, it can offer different reaction force, the third tube supporting the fourth, the fifth and the sixth rings resistance block is the best way of combination;(5) During the turning walking of excavating machine, real-time measuring control should be done and deviation should be found in time, when necessary, to rectify deviations by using auxiliary measures;(6) The amount of over-dig in the process of excavating machine turning walk can refer to the formula of pipe jacking construction.