The hottest Sany SR360 rotary drilling rig Yangwei

Sany SR360 rotary drilling rig Yangwei maximum span railway bridge

Sany SR360 rotary drilling rig Yangwei maximum span railway bridge

China Construction machinery information

Guide: with a total length of nearly 3000 meters, Anqing Yangtze River railway bridge, known as the world's first span, is jokingly called the competition arena of domestic large rotary drilling rigs in the industry because of the difficulty of pile foundation construction. On this competitive stage, Sany new generation SR360 outshines others, creating an average of 33 hours per pile, and the lowest perpendicularity is partial

with a total length of nearly 3000 meters, Anqing Yangtze River railway bridge, known as the "world's first span", is jokingly called the competition arena of domestic large-scale rotary drilling rigs in the industry because of the difficulty of pile foundation construction. On this competitive stage, the new generation SR360 of Sany stands alone, creating an industry miracle with an average of 33 hours per pile and a minimum verticality deviation of 0.38 meters

challenge four construction factors 4: electromechanical difficulty

the speed accuracy of Anqing Yangtze River railway bridge is a landmark project of Ning'an intercity railway and an important part of the Nanjing Anqing and Fuyang Jingdezhen railways

in the face of major projects, Sany Beijing pile driving method Research Institute conducted a detailed field survey in the early stage. The results show that there are four construction difficulties in this project: as a water construction project, the thickness of surface mud and sand is large, the compactness is poor, and the water content is large, so it is easy to have accidents such as hole collapse and over square in the construction process; Secondly, with the increase of formation compactness and strength, it is easy to slip and fail to drill in the process of operation; The construction of pile holes with a diameter of 2.5 meters in the rock stratum has high requirements for the torque of the power head, and there may be insufficient torque; Because there are many interlayers in sedimentary rocks and the difference between soft and hard interlayers is large, it is very easy to cause borehole inclination

according to the construction conditions, the pile driver with the maximum torque of more than 360 kn/M can meet the operation requirements. To this end, China Railway Bridge Bureau, the project party, invited 360 rotary drills from many well-known domestic manufacturers to see whether they can sensitively stop controlling products, compete for efficiency on No. 5, 6 and 7 piers and abutments, and compete on the same platform

Sany new generation SR360 rotary drilling rig under construction

each pile only takes 33 hours to complete the hole

this construction, Shanghai MinLong Construction Engineering Co., Ltd. won the bid for No. 5 pier and abutment, and took Sany new generation SR360 rotary drilling rig to the site for construction. The construction requirements are: the diameter of the pile hole is 2.5 meters, and the pile length is 78.3 meters

as the most mature type of domestic large tonnage rotary drill products, the maximum lifting force of Sany's new generation SR360 main winch has reached 300 kn, and the lifting speed is 51 M/min, which provides sufficient power and efficiency support for efficient operation

in terms of construction method configuration, Beijing Research Institute of pile driving method has specially designed a drilling bucket suitable for argillaceous sandstone working conditions for the construction project of Anqing super large bridge, which not only ensures the effective cutting in of harder strata, but also prevents the drilling rig from slipping and drilling

when driving the first pile, in order to be cautious, Beijing pile machine construction method research institute suggests that the construction company adopt the construction method of graded drilling and twice hole forming. Then, out of confidence in the strong power output of Sany SR360, it gradually transitioned to a hole forming operation, and completed the drilling operation of five piles within 10 days, with an average hole forming time of about 33 hours per pile. However, 360 drilling rigs from other domestic manufacturers operating on the same platform have drilled three times in stages, and the average hole forming time of each pile is about 3 days

"the operational efficiency of SR360 surprised us and gave us great confidence to complete the later project!" Sunxiuchuan, general manager of Shanghai MinLong Construction Engineering Co., Ltd., told

the vertical deviation of hole forming is only 0.38M

fast hole forming speed and first-class hole forming are the important characteristics of Sany's new generation SR360 rotary drilling rig in this construction

in order to ensure the stability during construction, Sany new generation SR360 rotary drilling rig is equipped with 5-level damping technology to absorb the drilling rig construction in an all-round and multi angle way. 2. As we have said above, the vibration frequency is used to ensure the construction quality. In addition, the upper mast truss adopts a parallelogram large triangle structure, and the mast forward tilt function with national patented technology, which provides a deep guarantee for the stability of the whole machine and operation

in view of the fact that there are relatively hard interlayers at 40m, 54m and 70m in the construction stratum of Anqing super large bridge, and the drilling hole is prone to tilt due to the difference between soft and hard, Beijing pile machine construction method research institute provided users with the construction scheme of special double bottom sand dredger bucket and special diameter rock barrel drill

the construction method team headed by wufangxiao, the dean of construction method research, has been assisting users on site and configuring complete construction methods to fully ensure the construction quality

with the support of perfect technology and construction method, the five piles driven by SANY's new generation SR360 rotary drill have been tested by Japanese professional hole measuring instrument, and the minimum perpendicularity deviation is only 0.38 m, which meets the requirements of the project party for 0.5 m deviation. Compared with products with a deviation of 1.2 m in the same field, SR360 has once again become a model of large tonnage accurate hole forming operation in the industry