witness the efficient construction of the retaining wall at the Xu construction site through a combination of "grabbing" and "milling" methods

The XCMG double-wheel slotting machine and the continuous wall hydraulic grab in operation

Due to the geographical location and the particularity of geological structures such as silty clay and silty sand, when the trenching machine excavates to over 60 meters, the geological conditions change. At this point, machines like double-wheel milling machines need to come into play to cut the soil and rocks beneath. Two XG700E continuous wall hydraulic grabs and one XTC80/85 double-wheel slotting machine from XCMG have shouldered this "tough" indicator on site.

The perfect combination ensures high construction efficiency

The Binjiang Station of the Metro is a standard side-platform station with six underground floors. Its main structure is a three-column and four-span box frame structure. It is constructed using a semi-forward and semi-reverse method. The structural system from the first to the third underground floors is constructed in the forward direction, while the fourth to the sixth underground floors are constructed in the reverse direction.

Aerial view of Binjiang Station of Nanjing Metro

The combination of "grab + milling" for the retaining wall equipment at the Xu construction site ensures efficient construction. On June 9th, the project completed all the construction of the diaphragm walls of the metro Binjiang Station's retaining structure. At present, the construction of large-diameter RJP high-pressure jet grouting piles for ground retaining walls is in full swing, and 27 piles have been completed.

It has high vertical accuracy in overcoming difficulties

The Binjiang Station is located in the alluvial plain of the Yangtze River floodplain. During the construction of the diaphragm wall, a series of difficulties need to be overcome, such as the difficulty in forming the silt layer trench, the difficulty in controlling the verticality of the trench wall, and the difficulty in hoisting the steel cage.

The underground continuous wall with a thickness of 1.5 meters and a trench depth of 78 meters is the most prominent and difficult point of this project, which is equivalent to burying a 23-story building underground.

To ensure the smooth construction of the diaphragm wall and solve the construction problems, the project has, in accordance with the changes in geological conditions, deployed XCMG continuous wall hydraulic grab and double-wheel milling machine to cooperate in the trenching construction of the diaphragm wall in the sand layer and the rock entry section.

On both sides of the foundation pit, XCMG continuous wall hydraulic grabs are used to reinforce the trench wall - after the trench wall reinforcement is completed, a guide wall is made - after the guide wall is completed, XCMG double-wheel milling machines are used to start grabbing the trench - after grabbing the trench to a certain depth, the milling process is carried out - after acceptance, the steel cage is lowered - after the steel cage is lowered, concrete is injected.

To ensure the verticality of the trench, the frequency of ultrasonic detection should be increased during the construction process, and errors should be corrected in a timely manner.

Ultrasonic detection tube

XCMG XG700E and XTC80/85 lived up to expectations. The three devices operated in parallel, combining grasping and milling, achieving efficient construction and maintaining full control within vertical accuracy. They received high recognition from the project party.