1、 Introduction of diaphragm wall trench cutters and manufactures WANG Jia-ning, TAN Qi 1 Summary Discussion 2.2 Casagrande 1 2 BC50 2 2.1 Bauer Summary Discussion 2.3 Soilmec 2.4 Toa-tone 2.5 3 3 1 Summary Discussion 4 Summary Discussion 11 Contents 20 Boost industry con dence,promote the transformat
2、ion and upgrading The fourth secondary member representative assembly and the 11th engineering machinery development top forum of China Construction Machinery Industry Association was held on Nov.7th to 8th in Xian. The Conference theme is “analyzing current situation, boosting confidence, promoting
3、 the transformation and upgrading of industry”.By the influence of national macroeconomic regulation control policy and the domestic and overseas and many other factors, engineering machinery industry from the latter half of 2011 has experienced more than a year of market demand downturn, been the m
4、ain economic indicators in low operation, and the development of the industry faces a severe challenge and test. However,with the national regulation and control measures put in place step by step and“stable growth”to the implementation of the policy, the national economic growth has started to pres
5、ent stabilize rebound trend, the steady upward of the Chinese economy will provide important and constant power for engineering machinery industry, pull the engineering machinery market demand, which is bene cial to the development of the industry. 25 China mining machinery industry overall situatio
6、n and future prospects in 2012 From the second half of 2011, by the in uence of the political and economic factors, the China excavator market sales has appeared for 15-month of negative growth, all kinds of hidden in the disadvantages of high-growth halo become increasingly apparent. According to t
7、he Excavating Machinery Branch for sufficient investigation of the future excavating machinery market trend,Excavating Machinery Branch predicts excavator market sales throughout in 2012 for 113000 units, in 2013, annual sales of 120000 units,in 2014, annual sales of 134000 units and in 2015, annual
8、 sales of 150000 units. 36 Research on the market and management of tower crane in Singapore and Malaysia Singapore is close to China by the geographical location with good social management order,and Chinese is generally used,and in recent years, compare strong engineering construction market, maki
9、ng Singapore become a very attractive export market for China tower crane. Recently years new tower cranes in Singapore main come from China, and YONGMAO tower crane occupancy is higher in the local market.The government of Singapore in the tower crane MOM authentication and strict field use managem
10、ent, effectively guarantee the construction hoisting machinery safety running, installing seldom appears accident. 54 The improvement and optimization of the head driving system of rotary drilling rig Analysis of the existing market on the rotary drilling rig power head is generally used to seal str
11、ucture, this paper proposes a new seal structure in view of oil leakage constantly problem: power box bottom using static seal mode instead of rotating seal mode, and the power head of other structures corresponding adjustment. Use Pro/E and ANSYS Workbench established model of power head , and analysis the improvement of sealing structure after the preliminary mo Thai simulation , to validate its feasibility. 61 Introduction of diaphragm wall trench cutters and manufactures With the increase of depth in underground diaphra
