February 7，Natural gas pipeline laying construction site in Thailand，Along with that rotation of the cutterhead of the tunnel machine,，The first section of pipeline laying in the first phase of the project is smoothly connected.，It marks the smallest diameter of domestic railway construction heavy industry.（φ914 mm）Rapid Topping Machine Completes the First Show of the Project。

The project runs through the site

Thailand Natural Gas Pipeline Phase I Project is located in the south of Bangkok.，The longest interval is 1 km.，Pipe diameter onlyФ914 mm，Adopt rapid roofing method for large slopeVType longitudinal curve construction。The whole pipeline must pass through the middle of the pile foundation of the high-voltage power line tower.，Cable tower pile foundation spacing is only 3.5 meters，There is a pylon every 200 meters.。Due to the ultra-small pipe diameter and long-distance curve tunneling,，Curved shield cannot be used/Traditional optical guiding mode of pipe-jacking equipment，The difficulty is comparable to that in deep ground.“Thread the needle”，It poses a new challenge to the reliability of equipment and the accuracy of measurement and control guidance.。  

Initiation of rapid topping machine

In view of the engineering difficulties of the project，China Railway Construction Heavy Industries Co., Ltd.Ф914mm ultra-small diameter ultra-long distance quick top laying machine，It has independently conquered the precise guidance and correction of long-distance curves.、Arrangement and heat dissipation of equipment in ultra-small spaces、There are many key core technologies such as long-distance power transportation and rapid and safe propulsion.。Under the careful cooperation of the service team and the construction team，470-meter pipeline laying in the first section is under construction，The tunneling process of the rapid roof laying machine realizes the zero failure rate of the main machine.，Maximum steady advance speed of 600 mm per minute，Maximum footage of 48m in 2 hours，Outstanding performance with the highest single-shift footage of 86 meters，Successfully pass through and penetrate precisely between two electric tower pile foundations along the way.，And that ultra-small diameter is complete、Very long distance、Technical Breakthrough in Fast and Reliable Construction of Ultra-high Precision Curves，Provide effective guarantee for the smooth implementation of the follow-up Thailand natural gas pipeline project。

At the same time，Recently, China Railway Construction Heavy Industry has achieved good results in many key and difficult underground pipeline network projects.。December 13, 2023，The first top shield machine of China Railway Construction Heavy Industry“City network crossing number”In the raw water pipeline project of Leifeng Waterworks in Changsha, it went out of the tunnel smoothly.，The total length of the project is 940 meters.，Maximum rock compressive strength exceeds 164MPa，Maximum daily footage 17.5 meters，It marks the first time that the top shield machine independently developed in China has been used in long-distance.、Breakthrough success in the construction of underground pipeline network in extremely hard rock。

“City network crossing number”Top shield machine rolled off the production line of China Railway Construction Heavy Industry Co., Ltd.

“City network crossing number”Top shield machine out of the hole

December 28, 2023，Pneumatic-controlled hard rock pipe jacking machine used in Hong Kong was successfully installed in the first section of the project to relocate the Shatin Sewage Treatment Plant to the rock cavern.。The whole tunnel of the project is jacked in a curved track.，Single jacking 320m，Full-face lithostratigraphy，Maximum uniaxial compressive strength of rock up to 150MPa。The successful implementation of the project has fully verified the excellent performance of the equipment and the ability of guiding and rectifying control.，Become the first domestic tunnel boring machine implementation case in Hong Kong，It has successfully broken the monopoly of European and American brands on roadheader products in Hong Kong for many years.。It is reported that，The equipment will be launched in the second section after the Spring Festival holiday.。

Pipe Jacking Machine Rolled off the Production Line in Hong Kong by China Railway Construction Heavy Industry

Pipe Jacking Machine Used in Hong Kong by China Railway Construction Heavy Industry Co., Ltd.

Railway Construction Heavy Industry aims to provide all-round intelligent technology and equipment for pipeline network construction for major projects around the world.。For major underground pipe network projects at home and abroad，China Railway Construction Heavy Industry Co., Ltd. provides comprehensive, systematic and targeted solutions，Self-developed hard rock pipe jacking machine、Retractable tube curtain machine、Top shield machine、Quick topping machine、Small-diameter shield machine and other equipment，It has successfully overcome a number of extremely complex underground pipeline network construction problems.。