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The world-class sea-crossing project—the Ningbo-Zhoushan Railway—has begun full-scale construction. With colorful flags fluttering at the site, the ZJD7000/1200 reverse circulation drilling rig developed and manufactured by Zhongrui Heavy Technology stands prominently at the Ningbo-Zhoushan Railway project site, drawing particular attention! The equipment has overall dimensions of 13m×9.9m×13m, a main unit weight of 240t (excluding drilling tools), a rated torque of 120t·m, a maximum drilling diameter of up to 7m, and a maximum drilling depth of up to 300m.‍

Zhejiang Zhongrui Heavy Industry Technology Co., Ltd.

is a technology-based enterprise specializing in the integrated development, manufacturing, sales, leasing, and maintenance of construction machinery. The company's large-diameter reverse circulation engineering drilling rigs hold a leading position in market ownership, and the company has participated in the construction of well-known domestic and international projects such as the Hangzhou Bay Bridge, Sutong Bridge, Hong Kong-Zhuhai-Macao Bridge, Fujian Pingtan Strait Road-Rail Bridge, Malaysia Penang Second Bridge, Mozambique Maputo Bridge, and Bangladesh PADMA Bridge.‍

The newly innovatively developed ZJD7000/1200 reverse circulation drilling rig is a brand-new product developed based on Zhongrui Heavy Technology's more than ten years of exploration experience in the engineering pile machinery field, and it is also a major breakthrough in equipment development for the large-diameter bridge foundation sector! It will be used for the construction of Φ6.3m bridge bored cast-in-place piles for the Xihoumen Bridge project of the Ningbo-Zhoushan Railway—currently the world's largest-diameter bridge bored cast-in-place pile.

The equipment innovatively developed patented components such as "a manipulator device for large workpieces" and "a heavy-duty platform for engineering drilling rigs," applying more than 10 patented technologies. The equipment integrates mature and advanced electro-hydraulic technology, a new-structure drill pipe and installation process, a multifunctional drilling tool combination, and an efficient rock-breaking and slag-discharging drill bit, giving the drilling rig advanced performance and precise control!

Xihoumen Road-Rail Bridge of the Ningbo-Zhoushan Railway

The Ningbo-Zhoushan Railway is one of the ten landmark projects for major corridor construction in Zhejiang Province and the No. 1 project in Zhoushan's comprehensive transportation campaign. The project is positioned as a rapid railway focused on Yangtze River Delta tourist passenger flow while also accommodating Zhoushan-Ningbo intercity passenger flow. It starts from Ningbo East Station in the west, passes through Yinzhou District and Beilun District of Ningbo, and Jintang Island, Cezi Island, and Fuchi Island of Zhoushan to the main island, with a designed operating speed of 250 km/h, a main line length of 76.4 km, 7 stations across the entire line, a total investment of 27 billion yuan, and a construction period of 6 years.

The Xihoumen Road-Rail Bridge, as its controlling project, has a main span of 1,488 meters. Once completed, it will be the world's largest-span road-rail combined bridge, raising China's railway bridge spanning capability from the kilometer level to the 1,500-meter level. The engineering difficulty of the Xihoumen Road-Rail Bridge is mainly reflected in the large span, high requirements for high-speed rail operation, and harsh bridge-building conditions such as "strong winds, high waves, deep water, rapid currents, and exposed bedrock." In response to these conditions, the design has adopted multiple technological innovations, and some technologies are being used domestically for the first time.