February second，The dragon raises its head！February 21, 8:28 a.m.，In ZoomlionZCC3200NPUnder the lifting of crawler crane，“Fourteen five”The first Hualong 1 unit to be started in China during the period——Inner Dome of Unit 3 of Huaneng Hainan Changjiang Nuclear Power Phase II Project in Place Successfully，It marks that the unit has been fully transferred from the civil construction stage to the equipment installation stage.，It has laid a solid foundation for further promoting the integrated construction of construction and security and promoting the construction of high-quality projects.。

▲Zoomlion Crane Successfully Hoisted the Inner Dome of Hualong 1 Changjiang Nuclear Power Unit（Pictures from CCTV News）

The inner dome is located on the top of the nuclear island reactor building.，It is a key component of the third safety barrier of the unit.，To ensure the integrity and tightness of the reactor building，It is of great significance to realize the inherent safety characteristics.，Therefore, the hoisting of the inner dome has become an important milestone in the construction of nuclear power projects.。

This time, ZoomlionZCC3200NPInner dome of Unit 3 of Changjiang Phase II Nuclear Power Project lifted by crawler crane，Have a diameter of 46.8 m hemispherical shell structure，Welded from steel plates with a wall thickness of 6 mm，Net weight about 350 tons。A safety system and a control system are arranged inside the device.，Back distribution network shape angle steel、Anchor nail and anchors，The overall structure is large、Complicated fabrication and assembly process、The technical requirements are high；The ratio of the inner dome diameter to the steel plate wall thickness is 7800.：1，It is easy to deform during hoisting.。ZCC3200NPThe inner dome was hoisted to a height of about 70 meters.，And then stably butt joint with that nuclear island barrel.，The difficulty is like using a crane to thread an embroidery needle.。

▲ZoomlionZCC3200NPHoisting is in progress（Pictures from CCTV News）

To ensure the perfect completion of hoisting，The project side has also set up a guide column in the nuclear island cylinder.、Limiting device, etc，From the four directions of up, down, left and right.“Lock it”Dome。After hooking、Luffing、Walk、Luffing、After a series of high-precision actions such as hook dropping，ZoomlionZCC3200NPThe crawler crane positions the inner dome precisely above the roof structure.，Quality of the whole hoisting process、Safe and controllable。

It is understood that，At the construction site of Hainan Changjiang Nuclear Power Plant，It has two Hualong 1 nuclear power units and one Linglong 1 nuclear power unit，Phase II nuclear power project、The construction of the world's first reactor demonstration project of Linglong 1 is progressing steadily as planned.，Formed“Two dragons fly together，Three piles are built together”A good pattern。Among，ZoomlionZCC3200NPSuccessful lifting construction of crawler crane for many times，It provides a strong equipment guarantee for the construction of these nuclear power units.。