China's "Deep-sea Space Station" Completes Debut

On February 6, the "Deep-sea Space Station" completed its first application at the Jintang Undersea Tunnel. The 75-meter high-pressure operation broke through the traditional depth limit, marking a new breakthrough in China’s deep-buried tunnel construction technology and filling the domestic gap in relevant fields.

2026-02-06

Company Leaders Attend the Third 2025 Executive Vice Chairman Meeting of the International Association for Large-Diameter Engineering Shafts, Piles and Deep Foundations

On January 10, 2026, the Third 2025 Executive Vice Chairman Meeting of the International Association for Large-Diameter Engineering Shafts, Piles and Deep Foundations was successfully held in Ningbo. Mr. Chao Huanqing, Chairman of our company, Mr. Yang Jingrui, Chairman of our controlled subsidiary (Luoyang Jiujiu Wear-Resistant Material Manufacturing Co., Ltd.), and Mr. Jin Wenge, Vice General Manager of our company, attended the meeting as relevant members of the Association .

2026-01-12

Congratulations to the "Zhenxing" tunnel boring machine on the successful completion of its cutter inspection!

The "Zhenxing" tunnel boring machine used for the right line of the Yanlu Passage over-river project is a 15-meter-class, ultra-large-diameter slurry shield designed and manufactured by CCCC Tianhe specifically for Nanjing's cross-river tunnel. The tunnel’s shield-driven section spans a total length of 2,975 meters. This project features significant characteristics such as a large cross-section, high water pressure, extended distances, and exceptionally abrasive ground conditions. Moreover, most of the construction lies beneath the riverbed, with the hardest rock layers in the hard-rock sections exceeding 70 MPa in strength. The diverse and complex geological conditions place extremely stringent demands on the cutting tools used during excavation.

2020-07-03

Luoyang Jiujiu Technology Co., Ltd. 20th Anniversary Celebration & Yuntai Mountain Resort Retreat

In August 2016, to celebrate the company’s 20th anniversary, a Yuntai Mountain resort getaway was held under the theme "Moving Forward Together, Creating Brilliant Futures." Yuntai Mountain, historically known as "Fufu Mountain," earned its second name due to its towering peaks and the perpetual clouds and mist that shroud the mountain throughout the year. The terrain is rugged and steep, with pristine forests blanketing the entire area. Towering over the landscape are deep, serene valleys dotted with crystal-clear streams and tranquil pools, complemented by countless breathtaking waterfalls and cascading springs. The scenery is nothing short of picturesque, featuring uniquely shaped rock formations that seem straight out of a dream.

2016-11-21

Luoyang Jiujiu Technology Co., Ltd. Successfully Held the 2015 Baoduzhai Red Tourism Event

In August 2015, our company organized a two-day trip to Luanchuan Baoduzhai, themed "Remembering the Martyrs and Revisiting Our Red History." Baoduzhai boasts rugged, undulating terrain that stretches endlessly, with its steep and perilous landscape. Back then, PLA soldiers bravely carried explosive packs and scaling ladders, defying enemy fire to liberate this ancient fortress—once home to generations of impoverished villagers trapped in dire suffering. At the site, employees paid tribute at the Heroes' Monument, watched a documentary chronicling the liberation of Baoduzhai, and witnessed firsthand the inspiring scenes of heroic martyrs fearlessly battling through relentless challenges to safeguard their homeland and protect their cherished community.

2015-09-17

Our company's ultra-large-diameter engineering drill bits have been perfectly applied in key national projects.

On June 3, 2015, the Z05 main tower pier of the main bridge over the Guyu Gate waterway for the Fuping Railway’s Pingtan Strait Dual-Use Bridge—a key national project—successfully completed the concrete pouring of a 4.5-meter-diameter bored pile. This pile currently represents one of the largest-diameter foundation piles in the history of bridge construction. The drilling bit used for this borehole was custom-designed and manufactured by Luoyang Jiujiu Technology Co., Ltd., featuring an innovative structural design and robust welding techniques, which provided a solid foundation and ensured high-quality results for the smooth completion of Bored Pile No. 4 at the Z05 pier of the Pingtan Strait Dual-Use Cross-Sea Bridge. Additionally, all eight 4.5-meter-diameter drill bits and 20 4.0-meter-diameter drill bits supplied by our company were seamlessly integrated with the corresponding drilling rigs for this critical project.

2015-06-11

Warmest congratulations on the successful completion of our company's shareholding reform!

Our company, through a resolution passed at the shareholders' meeting on March 10, 2015, officially changed its name from "Luoyang Jiujiu Technology Development Co., Ltd." to "Luoyang Jiujiu Technology Joint-Stock Co., Ltd." The subsequent business registration update was completed on March 31, 2015, marking the official transformation of our company type from a "Limited Liability Company" to a "Joint-Stock Company."

2015-04-06

Our company has successfully passed the High-Tech Enterprise certification three times in a row.

Luoyang Jiujiu Technology Development Co., Ltd. applied for and successfully obtained High-Tech Enterprise certification in 2008, underwent a re-evaluation as a High-Tech Enterprise in October 2011, and was re-certified as a High-Tech Enterprise again in October 2014.

2015-02-06

Conference Paper Directory

**Table of Contents for the 9th National Symposium on Large-Diameter Engineering Well Construction Techniques** 1. **Ultra-Large Diameter Bridge Composite Pile Foundation System** Jiang Wei, Diao Xinhong (School of Civil Engineering, East China Jiaotong University, Nanchang, Jiangxi) 2. **Trenchless Construction Techniques for Large-Diameter Pipelines** Ding Yiming (Branch No. 5, Sixth Company, Tianjin Urban Construction Group, Tianjin, 300250) 3. **Application of Roller Cutter Bits in Large-Diameter Mine Shaft Construction: Key Considerations** Chao Huanqing, Wang Hanzhang Luoyang Jiujiu Technology Development Co., Ltd. 4. **Drilling Construction of Large-Diameter Foundation Piles in Fractured and Sliding Layer Geology** Zhang Jinlin, Xie Tang (Luqiao Huannan Jinlin Foundation Engineering Co., Ltd., Zhongshan, Guangdong) 5. **Construction Techniques for Large-Diameter Deep Bored Pile Foundations under Special Conditions: A Case Study from the Tianjin Binhai New Area Light Rail Project** Zhu Mingsheng, Xie Kongjin, Gai Jianguo, Xu Hongwei, Li Liangliang (Shandong Zhengyuan Construction Engineering Co., Ltd., Jinan, 250014) 6. **Leveraging Technological Advancements to Drive Enterprise Growth** Chen Hongru, Li Shijing (Shenzhen Ruzi Niu Construction Engineering Co., Ltd.) 7. **Drilling Techniques for the Yichang Yangtze River Bridge on the Yiwan Railway** China Railway Major Bridge Engineering Group Co., Ltd. 8. **Pile Foundation Construction and Project Management for the Madura Bridge in Indonesia** Wang Jianjun, Liu Mufeng, Yi Jianying, Mao Shanyuan (Hunan Foundation Engineering Co., Ltd., No. 76, Section 3, Wanjiali Middle Road, Changsha, 410014) 9. **Preliminary Study on the Relationship Between Scraper Entry Angle, Drilling Pressure Ratio, and Hole-Forming Efficiency in Comb-tooth Drill Bit Applications** Gu Yuanxing Shanghai Guanglian Construction & Development Co., Ltd. 10. **Application of Horizontal Directional Drilling Technology in Tunnel Engineering** Li Shuhai, Zhou Haishong (Shanghai Guanglian Construction & Development Co., Ltd.) 11. **Practical Experience in Handling Downhole Incidents During Large-Diameter Bored Pile Construction** Li Shuhai, Zhou Haishong, Wang Yuanman (Shanghai Guanglian Construction & Development Co., Ltd., Shanghai, 200436) 12. **A New Approach to Pipeline Replacement Using Horizontal Directional Drilling Technology** Li Shuhai (Shanghai Guanglian Construction & Development Co., Ltd., Shanghai, 200438) 13. **Application of Long-Tube Canopy Advanced Support Systems in Tunnel Portal Construction** Ou Lingyong Hunan Road & Bridge Construction Group 14. **Monitoring and Measurement during Snowfeng Mountain Tunnel Construction: Analysis of Surrounding Rock Stability** Cao Caiyong (Hunan Provincial Road & Bridge Group Co., Ltd., Changsha, Hunan, 410000) 15. **Analysis of Karst Geological Conditions and Pile Foundation Construction Methods** Xie Yongchun, Yan Jiong Hunan Road & Bridge Construction Group 16. **Development of the Self-Propelled Reverse Circulation Drilling Rig Model GFC-120** Zhang Xikun, Song Qiufeng Hebei Institute of Construction Exploration & Research, No. 58 Jianhua South Street, Shijiazhuang 17. **Discussion on Temperature Control Techniques for Large-Volume Concrete** Li Ziquan Hebei Institute of Construction Exploration & Research, No. 58 Jianhua South Street, Shijiazhuang, 050031 18. **Prevention and Remediation of Accidents in Impact Bored Pile Construction in Karst Regions** Zhao Jianqiu Hebei Institute of Construction Exploration & Research, No. 58 Jianhua South Street, Shijiazhuang 19. **Summary of Construction Experience for Rock-Embedded Bored Piles in Areas with Developed Karst Features** Li Chenyan, Zhang Peng Hebei Institute of Construction Exploration & Research, No. 58 Jianhua South Street, Shijiazhuang, 050031 20. **Calculation Method for Settlement Curves (σ—y) of Sutong Bridge Bored Piles** Shangguan Xingjiang, Jiang Wei (East China Jiaotong University) 21. **Load-Bearing Capacity Analysis of Sutong Bridge Test Piles** Sutong Bridge Construction Command 22. **Sutong Bridge Bored Pile Construction Platforms** China Communications Second Navigation Engineering Bureau, China Communications Second Highway Engineering Bureau 23. **Construction of Ultra-Long Bored Piles for the Sutong Bridge** China Communications Second Navigation Engineering Bureau, China Communications Second Highway Engineering Bureau

2013-08-26

Wuhan Erqi Yangtze River Bridge Bored Pile Construction Technology Seminar

The "Wuhan Erqi Yangtze River Bridge Bored Pile Construction Technology Seminar" was held in Wuhan on March 27. The meeting was organized and chaired by the China Communications Construction Company Second Navigation Bureau, the leading institution of the National Large-Diameter Engineering Well Construction Technology Collaboration Network. This marked an academic gathering of the "National Large-Diameter Engineering Well Construction Technology Collaboration Network."

2013-08-26