On the morning of August 3，On Dongsheng Road, Shenxian County, Liaocheng, Shandong，Nearly 40 cranes are arranged neatly.，To prepare for the urban low-carbon intelligent heating project pull-back project。

Out of safety、Environmental protection、Comprehensive consideration of cost and other factors，The tube-pulling construction technology is adopted in the Tuhai River crossing section of the low-carbon intelligent heating project in Shenxian County。

Pipeline crossing from the river bottom，The deepest point is 24 from the riverbed.m，Length of bottom straight section 36m，The total length of the pull tube is 684m，Total weight 460t。The construction pipeline is divided into water supply pipeline and backwater pipeline.，The two pipes are separated by 5.3m。

Yan Shufeng, the person in charge of hoisting around Liaocheng, introduced.：“Forty cranes were used in the construction.，Among，Sany's cranes account for nearly 80 percent，There are 90 tons、80 tons、50 tons，And 25 tons。”

The thermal insulation pipe is used for pulling back the pipe this time.，Compared with the common pull tube，Heavier insulation pipes，The technical requirements for crossing the bottom of the river are higher.，Construction is more difficult.。

Yan Shufeng said：“Certain attention is paid to the selection of equipment tonnage and station position.。Medium tonnage vehicles are required at both ends of the pipeline，The lifting weight is about 25 tons.，And the middle is not so laborious.，25-ton equipment is used.，The lifting weight is about 13 tons.。”

Single pipe diameter 1.2m，Underpass nearly 600m，During the lifting process，The crane is required to move the swing arm at the same time as the pipeline to be lifted。It is necessary to ensure that 40 sets of equipment can complete the pipe delivery at the same time.，It's really not easy.，The rotation range of each equipment shall not be too different.。

Yan Shufeng said：“In order to ensure the consistency of action，The construction party shall select the equipment of the same brand as far as possible.。Because the stability and micro-motion of the Sany crane are very good.，So it is basically based on Trinity.，In this way, the cooperation is more tacit.。At the same time，The construction party has also formulated a detailed construction plan.，Strictly implement the location of equipment、Distance and lifting weight、Turning and other details，Ensure accuracy and safety during construction。”

Final，Only 2 days，Successful completion of the pipeline pullback across the Tuhai River section。

The low-carbon intelligent heating project in Shenxian urban area is related to people's livelihood.、A warm cause for the benefit of the masses。After the completion of the project，The intelligent management level of urban heating in Shenxian County will be improved as a whole.，Provide better quality for the masses、More accurate heating services，And realize energy conservation and consumption reduction.、Green and low carbon，Finally reach“Ecological heating”。