In recent days, SR630RC8 rotary drilling rig developed solely by Sany Heavy Machinery Company has been successfully delivered to the customer. Currently the equipment is making its effort to boost the Shenzhen's construction. Regarding to its performance, the customers are full of praise. In 2011, Sany has developed once the first largest rotary drilling rig SR460 in Asia, with a maximum drilling diameter of 3.5 meters, and a maximal drilling depth of 120 meters. The new SR630RC8 rotary drilling rig broke the record once again, with its maximum drilling diameter of 4.5 meters and its maximum drilling depth of 140 meters, the new equipment becomes today's largest rotary drilling rig in Asia. In addition, its maximum output torque is 630kN•m, which reaches a new height in the industry of large rotary drilling rigs.
Business Demand Rising Constantly for the Super Large Rotary Drilling Rig
In recent years, the construction method of filling pile in rotary drilling hole has been becoming mature. Its high pore-forming quality and high efficiency have laid the technical foundation for the development of super-deep and super-large rock pile design, which makes such business demand constantly growing.
Under such background, with diameter reaching 4.5 meters, the pile of 140 meters deep has been created. It's like driving the rock pile with a diameter corresponding to the length of a common sedan down to 50 floors underground. Like the saying, "it's easy to go to the Heaven, but difficult to go underground", this super-large and super-deep rock pile construction has posed a huge challenge to the various performance factors of the equipment.
According to the standing vice manager of Sany Heavy Machinery Co., Ltd. Ding Shengju, currently, the manufacturer that can produce such large scale of rotary drilling rig is rare in China, and the production of large rotary drilling rig needs the support of a powerful R&D and manufacture system. In order to satisfy the customer demand for a “super-large, super-deep, and super-difficult" pile foundation construction, Sany Beijing has put the idea of developing SR630RC8 rotary drilling rig on the agenda.
Customized Largest Rotary Drilling Rig with Intensive Study
"The super-large diameter requires the drill to have a super-large in-rock torque, and the super-deep idea needs a super-long drill rod. In the same time, a sufficient safe coefficient is also indispensable in order to work in the condition of super-large torque", said Zhang Shiping, the project manager and vice-president of Sany Heavy Machinery Research Institute. Otherwise, with a height of almost 35 meters and a weight of over 200 tons for the whole equipment, the stability of drill work is also a difficult point that must be overcome.
There were a lot of difficulties to be conquered, but the customer's construction commencement date was scheduled at the beginning of July. So in order to meet the schedule of delivery, the whole team has spared their recess time and fully committed to the project.
To understand the geologic demand, the R&D team has been to the customer site for an in-depth survey and been communicating with the customer in details. Finally they combined the survey results into their design. The R&D personnel not only conducts the customized design for large backfill, boulder, deep in thick rock and other actual conditions, but also guarantees that the equipment can satisfy the customer's requirement where their business will take a lead in the coming 3-5 years.
The Sany R&D team has also visited many steel mills in the country. After repeated selections, they finally found the high-tensile material for the drill rod with strength greater than 800MPa but still good for welding. And in order to meet the stability requirement, the overall plan has been through more than 10 rounds of reviews, in the end the modular interface design proposal has been adopted to satisfy the demand for deep and large pile.
After all the efforts, Sany has developed the largest rotary drilling rig SR630RC8 in Asia, and delivered it to the customer on June 30.
Better than the benchmark, and cost-saving for the customer
According to the introduction, SR630RC8 rotary drilling rig has a maximum drilling diameter of 4.5 meters, a maximum drilling depth of 140 meters, and a maximum output torque of 630kN•m. These technical parameters have already exceeded the benchmark product of the world's largest rotary drilling rig, and have reached a new level in China.
At the same time, double large triangle structure, multiple gear control of power unit, multiple gear control of pressurizing system and other technologies makes the SR630RC8 not only achieve the constructions for super in-rock, super large diameter and super-deep drilling, but also guarantees the highly reliable and efficient running of the drill, which enhances the convenience of construction. This equipment applies to the super high-rise constructions above 100 meters. It solves the difficult problems such as large backfill, boulders, deep in thick rock in the construction of super-large and super-deep pile.
The SR630RC8 rotary drilling rig has been working for many days in Shenzhen. Regarding to its performance, the customers are full of praise.
“As long as we use Sany equipment, the project can always be completed in time; this saves me a lot of cost", affirmed Chen Zengyong, a senior user in the pile foundation construction market of Shenzhen. The man who gave his positive comments on the quality of Sany products, has already owned 7 Sany pile machines with a total investment of over 100 million RMB. According to the customer, Sany pile machine has always been able to complete the most difficult works, and he is also very satisfied about Sany's construction method. He said," in Shenzhen, there are no geologic or construction conditions that Sany product can't suit which greatly boosts my trust in Sany. Furthermore, the Sany's construction method support for users is the number one in the piling construction machinery industry. "
