In the "Belt and Road" Latin America "Silk Road Station". Recently, the country's largest livelihood water conservancy project, the Santa Elena Water Project, was officially handed over. This is also the first water conservancy project for Chinese buildings to enter the South American market. After completion, it can guarantee the irrigation water for 350,000 hectares of land, which will greatly improve the situation of watching the work, and about 560,000 people will benefit. The Chinese installation engineering company undertook two projects for the restoration of the dam, the demolition of five irrigation stations, the expansion of one pump station, the operation and maintenance of two pumping stations, and the installation and installation of a 3000-meter water supply pipeline. This young team with an average age of less than 30 years old has broken down the land along the “Belt and Road” with its professional skills, injecting new vitality into the local economic development and people's livelihood.

40 meters underwater "passing secrets"

In the case of lost design data 30 years ago, under the 40-meter underwater operation, how does the project team ensure that the construction plan is foolproof? When the construction plan was started, the CCT team encountered the first challenge level.

The CHONGON Reservoir was built in the 1980s and solved the problem of irrigation and draught of 300,000 people in the downstream. However, due to years of disrepair, there are great safety hazards. It is extremely urgent to carry out maintenance and repair of the dam, drainage bottom hole and water intake tower of the reservoir. .

It is necessary to carry out detailed exploration on the water inlet corridor and the surrounding geological conditions of the dam drainage bottom hole with a vertical depth of 40 meters and a depth of 200 meters. This is the first attempt to construct underwater construction in the mid-rise installation, which is a rare underwater operation in China. The chief engineer of the project, Hu Chengjun, took over the "war book." Through many discussions with professional diving teams and mechanical water conservancy experts, and organizing underwater exploration, it was found that the geological structure around the reservoir inlet corridor changed, and the concrete structure also had hidden dangers. The plan was to install a gate at the entrance of the corridor. Not applicable. Through trial and error, the project team decided to set the sealing door at the end of the corridor 200 meters, but it increased the construction difficulty. By formulating a detailed construction plan, redesigning the structure of the underwater blocking gate, doing a technical dip and safety first aid escort, not only successfully completed the construction of the underwater sealing gate, but also perfectly ended the underwater 40 m operation and ensured the dam drainage bottom. The safety of subsequent construction of the hole.

"GRACIAS!" fix the "trouble road" as soon as possible

Every weekend, the CHONGON dam has become a paradise for local sports enthusiasts, but the dam road that has been in disrepair has long been ruined. It is one of the important goals of the project team to fix the "trouble road" as soon as possible.

Drilling analysis of roadbeds, looking at quarries, looking for roads and roads to explore the quality information of road bases, redesigning and modifying asphalt concrete road drawings, and strictly controlling the thickness and compactness of road base materials... The project team under construction has overcome many complicated problems. In the first week after the road was opened, the local people's "GRACIAS" (Spanish: Thank you) let everyone sweep the hard work of the past. I haven't had time to rest, and another reservoir, AZUCAR, 100 kilometers away, has encountered the same problem. Everyone began to invest in the busy process of programming, transporting materials and deploying machinery.

“Chinese Standard” and “Made in China” Export to South America

The construction of the project requires CHONGON pumping station to expand 2 pumps and 3,000 meters of 1.6-meter-diameter pressure steel pipe, but the local production capacity is insufficient, there is no steel for the production of pressure steel pipe, project manager Li Depeng decided to apply for investment of 10 million yuan to build a modern steel pipe in the local area. Manufacturing processing plant.

However, the owner did not agree to adopt the Chinese standard materials. The China Construction and Installation Petrochemical Engineering Branch stationed the engineer to recalculate and verify the original design, and established the water hammer model analysis to prove the Chinese standard and Chinese materials with the detailed data. Absolutely reliable. After a month of difficult negotiations, the owners finally agreed to purchase the Chinese standard Q345R steel plate, saving the project material cost of 4 million yuan.

At the same time, the domestic procurement team has been inquiring about the numerous equipments needed for the construction of the factory, and strictly inspecting the bidders. It is preferred to use high-quality enterprise suppliers with overseas equipment supply experience and strength, and drive more than 5,000 yuan of large-scale equipment to South America for export tax rebates. The amount reached 5.5 million yuan.

Challenge the "acceleration" during the dry season

The pressure pipe manufacturing plant was successfully built and the steel plate was shipped to the construction site. 3000 meters of steel pipe, 1200 steel plates, the normal production period takes 5-6 months, but the pressure pipe is installed in the wilderness, the construction road is not available, and the local rainy season from January to March, the construction process is very difficult.

The CSR team adopts a day and night shift construction mode, 20 hours of continuous manufacturing operations, 4 hours of non-destructive testing, and from the trial production to the manufacture of the last section of steel pipe, only two and a half months. Foreign owners have repeatedly praised: "Chinese builders are really amazing!"

When the production of pressure pipe is in full swing, it has encountered the land acquisition problem left by the owner 20 years ago. Li Depeng hired lawyers to be reasonable and sensational, so that the landlord and the provincial government of Guayas felt that Chinese builders brought them the infrastructure upgrade and upgrade. In the end, without any compensation for land acquisition, the project team grabbed Before the rainy season, the 3,000-meter-strength steel pipe was successfully completed through large excavation, installation and backfilling of five land plots and one nature reserve.

The rainwater on schedule failed to stop the progress of the CSR installers, raincoats, rain boots, construction vehicles and ginger soup. From January to March, the project team relayed a construction output value of US$6 million. Humberto Cholango, Minister of Water Resources of Ecuador, inspected the project: "We are full of confidence in the Chinese construction management team."

Crack the pump maintenance problem

The 4 large pumps have been used as an important source of water for 20 years. Most of the components are seriously worn. Two of the pump groups have been unable to start. Only the scattered drawings have no ability to guide the pump group. In order to avoid damage to the equipment caused by forced dismantling, the project team formulated a strict mechanical maintenance plan, clarified the pump group disassembly and reloading process, repeated adjustment and adjustment of the mechanical maintenance program, re-production of spare parts for the pump 20 years ago, and went to the field supervision. Make acceptance.

The team used the penetrant inspection method to detect the condition of equipment components, and used epoxy ceramic filler to repair damaged parts, which not only reduced the construction difficulty, but also greatly improved the construction efficiency. The original two-pump construction period of 90 days was completed, and the task was completed in only 35 days with high standards.

After 22 months, 7 major operation areas and 16 construction sites, China Construction installed with first-class quality and professional technology to break ground and clean up the brand along the “Belt and Road” to inject new into the local economic development and people's livelihood construction. vitality. From cultural integration to co-construction and win-win, from dreams to people's hearts, China Construction has rooted in the American soil and witnessed the new achievements of the “Belt and Road” construction. Editor / Wang Zhizhe