With the continuous improvement of urban infrastructure,，The permanent population of Pingshan District in Shenzhen, Guangdong has increased sharply.。To further improve the conditions of education and teaching，Pingshan District Intensifies Efforts to Promote Major Education Expansion Projects，Liulian Primary School Expansion Project is one of them.。At present，The main structure of the project has been completed 90%，The capping work is in progress.。

Project site，There is a 130-ton truck crane after the completion of the lifting operation.，He was trapped in the pit because he could not drive out by himself because of the limited space.。According to the on-site staff investigation，The 130-ton crane weighs 60..5 tons，The nearest lifting span is less than 40 meters.，How can I put it“Rescue”Coming out has become a difficult thing.。

The hoisting weight is heavy.、Large volume，At the same time, it requires high accuracy.。Once there is a tilt in the process of hoisting, it is likely to cause a major accident.。

To make sure nothing goes wrong，Shenzhen Hongshunfa Loading and Handling Service Department is out.SAC7500C7-8。General Manager Liang Haoming introduced：“This work can only be done by this 750 ton machine.，It has a smaller body size.，With counterweight deflection，Suitable for operation in narrow space of municipal road。It is also the truck crane with the largest tonnage in Shenzhen.，Lifting capacity is guaranteed。Be it for safety or efficiency，It is the most preferred.。”

It was originally planned that this 750-ton machine would need to carry super-lift operation.，However, through continuous trial lifting,，Driver Yang Shifu said.：“This car has a large safety margin.，It can also complete the task perfectly without super lift.。”

On the morning of May 8，SAC7500C7-8 Depart for the construction site。After parking in a suitable position, some counterweights were loaded first.，Then extend the main arm，The counterweight originally installed on the 130-ton truck crane was unloaded in batches.，Transfer to transport vehicle。

After the counterweight of the 130t truck crane is unloaded，SAC7500C7-8 with a full complement of 183 tons，Restart boom commissioning。The workers in the pit shall tie the wire rope to the 130t truck crane.，And adjust the angle carefully.，Make sure that there is no significant tilting during lifting。

That evening，SAC7500C7-8 Start the trial lifting，Then the operation officially began.。Hoist from the foundation pit、Turn around、Place，It's all rightThe process is smooth，At one go，Takes less than 20 minutes.。

Liang Haoming, general manager of Shenzhen Hongshunfa Handling Service Department, said.：“Judging from this construction,，The performance of this 750 tons is very strong.，It saves us the cost of a cart without a super car.。Although this is a difficult lifting operation.，But both the on-site staff and the hoisting master are relaxed.。”