The Pearl River Delta is known as“Geological Museum”Known as，Hydrology、The geological conditions are extremely complex.。Pearl River Delta Water Resources Allocation Project across Foshan、Guangzhou、Dongguan、Shenzhen，Total length of water transmission line: 113.2km。The construction is faced with large buried depth of the line、The water permeability of surrounding rock is strong、Multiple challenges such as difficulty in changing tools under the sea。

Recently，Bear the heavy responsibility of crossing rivers and oceans“Yuehai 39”Shield machineAtBDownhole of Bid Section 4。BLot 4 is“Gaoxinsha Reservoir to Shaxi High-level Pool”Part of a water main，It is also a key link to open up the tunnel excavation of the Pearl River Delta Water Resources Allocation Project.。

“Yuehai 39”Total length of shield machine: 104m、Weighing 1,219 tons.、Diameter 8.6 meters。According to the requirements of the construction party，Split hoisting method shall be adopted for downhole operation.，The settlement must be controlled within 2 mm.，During the crossing，If the amount of settlement is more than the slightest，The damage will be incalculable.，This puts forward new requirements for hoisting equipment.。

  

Dou Zhengran, Yueruntong Hoisting Transportation Co., Ltd., a subsidiary of Zeyou Science and Technology Group, said.：“Lifting equipment shall meet three requirements.，First, it has a certain effective hoisting height.，Second, it has a large lifting capacity.，Third, in the process of hoisting, it is necessary to be able to hoist large parts such as cutter heads.，Also be able to lift small pieces.。Final，They choseSCC4000A-2 Crawler crane。”

  

This hoisting，SCC4000A-2 AdoptedMain arm+Jib 24m+9mShield working condition，Be responsible for the translation of the cutter head、Roll over、Down the well，As well as turning over and lowering of the main drive.。

Operator Huang Quanjie said：“In addition to the normal lifting action，This time, the equipment also needs to be hoisted and moved.，Each shield body，Place in the specified position to the accuracy of mm。Of this device.‘Inching’Function，Able to feed in millimeters，Solved a big problem on the spot.。”

  

Huang Quanjie said：“SCC4000A-The lifting capacity of 2 is very strong.，What is the equivalent of the concept?？The largest animal on earth today is the blue whale.，Weight of more than 150 tons，This truck can lift two blue whales at the same time without any difficulty.。BecauseIts undercarriage is larger than other cars of the same tonnage.，The stability is better，Thereby ensuring the safety of the hoisting of the shield component.。”

  

The Pearl River Delta Water Resources Allocation Project is a major national water conservancy project.、Important livelihood projects in Guangdong-Hong Kong-Macao Greater Bay Area。After the completion of the project，Water will be supplied from the Xijiang River system to the eastern part of the Pearl River Delta.，It plays an important role in ensuring the safety of urban water supply and economic and social development.，At the same time, it will also provide strategic support for the development of Guangdong-Hong Kong-Macao Greater Bay Area.。