China Railway Construction South China and China Railway Heavy Industry have obtained patents related to rock formation drilling equipment, specifically patents for devices and methods with low clearance that are efficient and safe.

March 29 news, according to information from the National Intellectual Property Administration, China Railway Construction South Company Limited and China Railway Construction Heavy Industry Group Co., Ltd. applied for a patent named “A Low-Clearance Rock Layer Drilling Construction Device and Its Method,” with authorization announcement number CN116816257B, and the authorization announcement date is March 27, 2026. The application publication number is CN116816257A, the application number is CN202310783042.6, the application publication date is March 27, 2026, the application date is June 28, 2023, and the inventors are Yin Baodang, Lin Cheng, Shen Pengfei, Wang Tian, Zhou Jian, Chen Qian, Chen Liang, Han Bing, Sha Mingyuan, Yu Guiliang, Liu Xue, Xu Bo, Luo Baoan, Zhao Yonggang. The patent agency is Guangzhou Junshi Intellectual Property Agency Co., Ltd., and the patent agent is Jiang Li, with classification numbers E21B7/02, E21B15/00, E21B25/10.

The patent abstract shows that the invention relates to a low-clearance rock layer drilling construction device and its method. The low-clearance rock layer drilling construction device described in this invention includes: a rotary drill rig arranged in the frame, with a material transfer space left between the top surface of the rotary drill rig and the frame, the frame is equipped with a hoist and a first material handler, the first material handler is located in the material transfer space, and the hoist drives the first material handler to pass through the through hole and clamp and lift the broken rock core; the full casing is driven by the rotary drill rig, including a drill rod assembly formed by several first drill rods axially spliced together, and a second drill rod axially connected to the bottom of the drill rod assembly, the second drill rod is provided with a splitting rod for laterally supporting the rock core and causing it to fracture; the downhole hammer is axially connected to the second drill rod and is used for annular cutting of rock layers to form columnar rock cores. The low-clearance rock layer drilling construction device and its method described in this invention have the advantages of high efficiency and high safety.

Tianyancha data shows that China Railway Construction South Company Limited was established on January 19, 2017, with legal representative Zhang Cheng, in the civil engineering construction industry, with a large enterprise scale, registered capital of 1 billion RMB, paid-in capital of 1 billion RMB, and registered address at Room 2001, No. 1 Nanfulu, Huangge Town, Nansha District, Guangzhou (office only). China Railway Construction South Company Limited has invested in 7 enterprises, participated in 645 bidding projects, with 3 trademark information and 239 patent information in terms of property clues, and has 21 administrative licenses.

The recent patent situation of China Railway Construction South Company Limited is as follows:

China Railway Construction Heavy Industry was established on November 23, 2006, and was listed on the Shanghai Stock Exchange on June 22, 2021, with both registered and office addresses in Changsha, Hunan Province. It is a leading underground engineering equipment manufacturer in China, with its core business covering equipment such as tunnel boring machines and possessing a complete industrial chain and strong technological research and development advantages.

China Railway Construction Heavy Industry belongs to the Shenwan industry of machinery and equipment - construction machinery - construction machinery complete machines, involving government holdings, railway infrastructure, state-owned enterprise reform, and other conceptual sectors. Its main business is engaged in the design, research and development, manufacturing, sales, leasing, and service of tunnel boring machine equipment, rail transit equipment, and specialized equipment.

In 2025, China Railway Construction Heavy Industry achieved an operating income of 10.045 billion yuan, ranking 2nd/3rd in the industry, with the industry leader Shantui Co., Ltd. at 14.62 billion yuan, an industry average of 10.452 billion yuan, and a median of 10.045 billion yuan. In its main business, the income from tunnel boring machines was 5.689 billion yuan, accounting for 56.64%. In terms of net profit, it was 1.483 billion yuan in 2025, ranking 1st/3rd in the industry, with Shantui Co., Ltd. in 2nd place at 1.214 billion yuan, an industry average of 1.042 billion yuan, and a median of 1.214 billion yuan.

The recent patent situation of China Railway Construction Heavy Industry Group Co., Ltd. is as follows: