In Guizhou, known as the "World Bridge Museum" and known as the "Earth Crack" in the Huajiang Grand Canyon, the construction of the "world's tallest bridge" - the Huajiang Canyon Bridge on the Lu'an Expressway is underway. Several Zhonglian Heavy Technology tower cranes are "in service" here, achieving "China's speed" and "China's height" with "Made in China".

"Since March, the average 'length' of No. 5 main tower has been 0.8 meters per day, far exceeding the average 'length' of 0.6 meters for conventional steel truss suspension bridge. It is the fastest 'length' of suspension bridge in domestic mountain bridge construction." Liu Shengtao, executive deputy chief engineer of Liuzhi – Anlong Expressway Lot 7, said. Two Zhonglian Heavy Industries WA7527-20KB flat head tower cranes are here to assist in the construction of the main tower of the bridge.

As is well known, the construction of the main tower of a bridge is often the "hardest nut to crack", especially in the Huajiang Canyon Bridge project. Due to the influence of canyon winds, the wind field here is complex, and the maximum monitored wind speed is 12 levels. The No. 5 main tower is the highest cable tower of the Huajiang Canyon Bridge, with a height of 262 meters, equivalent to the height of 80 multi-story buildings. Hoisting construction here requires extremely high performance of the tower crane. Zoomlion WA7527-20KB flat head tower crane has excellent lifting performance with a short boom length, with a maximum lifting capacity of 20 tons and a maximum lifting speed of 95 meters/minute. The 75 meter long boom tip can lift 2.7 tons, which is at the leading level in the industry.

The safety and handling of the WA7527-20KB flat head tower crane are also excellent. In terms of safety, the WA7527-20KB not only has triple protection for lifting weight and double protection for torque to strictly prevent overloading, but also is equipped with safety technologies such as triple protection for lifting height to prevent collision, double protection for amplitude to prevent collision, intelligent detection and protection for electric control system to prevent sliding hook, and zero speed hovering. In addition, the lifting arm of WA7527-20KB is connected with a pin shaft, which has strong resistance to sudden unloading and accidental collision.

In terms of handling performance, the new variable frequency rotation system equipped with WA7527-20KB can enable instantaneous response during lifting, without shaking or swinging during the entire process, making the operation smoother. It can also achieve millimeter level ant speed positioning, with a minimum of 5 millimeters per second.

At present, two WA7527-20KB flat head tower cranes have been installed to a height of 280 meters. The 5th and 6th main towers face each other across the gorge, with towering columns towering on the cliffs. The Beipan River under the bridge lies like a blue ribbon in the embrace of the Grand Canyon.

It is understood that the Huajiang Canyon Bridge is a key control project of the Lu'an Expressway, with a vertical height of 625 meters between the bridge deck and the water surface. After completion, it will break the world record for the vertical height of the mountain bridge deck to the water surface and become the world's tallest bridge. Zoomlion Heavy Duty Tower Crane will continue to provide solid equipment support for project construction with advantages such as good lifting performance, stable operation, and safe operation. Editor/Xie Li