February 7th saw a significant breakthrough achieved on the Bang Pakong-South Bangkok power plant gas transmission pipeline project in Thailand. The first section of the initial phase of pipeline laying successfully employed a 914mm diameter laying and jacking machine manufactured by CRCHI (China Railway Construction Heavy Industry), in its successful completion.
CRCHI laying and jacking machine launches in BangkokThailand
The first phase of the gas transmission pipeline project for the Bang Pakong-south Bangkok power plant is situated in the southern region of Bangkok. The longest stretch covers approximately 1km. The laying and jacking machine was specifically designed for constructing large slope V-shaped longitudinal curves. Notably, the entire pipeline had to be installed among the foundations of high-voltage power line towers, spaced just 3.5m apart, with tower intervals of 200m. Given the extremely narrow space and the challenge of manoeuvring an ultra-small diameter pipe over long-distance curved excavations, traditional optical guidance systems proved inadequate. The excavation process resembled “threading a needle” at depth, presenting a fresh challenge for equipment reliability and measurement and guidance system accuracy.
CRCHI developed the 914mm diameter ultra-small diameter and ultra-long distance laying and jacking machine to overcome several key core technology challenges independently, including accurate long-distance curve guidance, equipment layout and heat dissipation within extremely limited spaces, long-distance power transmission, and rapid and safe propulsion.
With the collaborative efforts of CRCHI’s service team and the construction team, the machine delivered exceptional performance with a zero failure rate for the main machine, achieved a stable excavation speed of 600mm per minute, recorded a maximum footage of 48m in two hours, and accomplished a single-shift record of 86m during the initial 470m section of pipeline laying construction.
The machine successfully navigated the pile foundations of two power towers with precision, marking a technological breakthrough in the fast and reliable construction of ultra-small diameter, ultra-long distance, and ultra-high precision curves.
Previously, on December 13th, 2023, a CRCHI jacking shield machine achieved a breakthrough in the raw water pipeline project of the Changsha Leifeng water plant in China. Covering a project section of 940m, with rock compressive strength exceeding 164MPa, and a maximum daily footage of 17.5m, this success marked a breakthrough in constructing long-distance pipelines through highly resistant rock formations.
Similarly, on December 28th, 2023, a pressure-controlled hard rock pipe jacking machine deployed in Hong Kong, China, completed the initial section of a relocation project from Sha Tin Sewage Treatment Plant to a rock cave. This involved tunnelling along a curved route with a single jacking span of 320m. The rock strata throughout the section exhibited a maximum uniaxial compressive strength of 150MPa. The successful execution of this project validated the equipment’s exceptional performance, says CHCRI, and directional correction control capability. Following the Chinese New Year, the equipment was planned to commence excavation for the second section.
CRCHI
China Railway Construction Heavy Industry Corporation Limited are manufacturers of Tunnel Boring Machines (TBM’s), Belt Conveyors and Drill & Blast...
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