On the scorching sun of Laizhou, Shandong Province, when a group of China Coal workers covered with sludge successfully ascended from the bottom of the main shaft of the Shaling Gold Mine at a depth of 1551.8 meters, it marked the safety of the deepest shaft in Asia, and the national tenth The demonstration project of building wells and upgrading key technologies in deep metal mines under the Third Five-Year Key R&D Plan was completed on schedule.

The entire mine industrial factory area applauded and thundered, and all the employees surrounded each other and cheered. Only the strong-looking project manager Li Lei turned around slowly, with tears of joy in his eyes...

A promise, a responsibility

In 2019, Shandong Gold Group resolutely handed over the deepest shaft in Asia, the main shaft of Shaling, to the three sites when it learned that the three sites of China Coal Construction Group had just built a 1527-meter deep shaft in the new city. "After winning Shaling, the three places are the first in Asia, and it must be done to the end." Wang Jiquan, the then director, when deploying the construction task of Shaling, made the project manager Li Lei deeply realize that when the Shaling project was handed over to the Giving China Coal Construction Group three places is not only the trust in the strength of the central enterprises, but also the recognition of the ability of China Coal Construction Group, and it is also a test for the three places. Since then, with the brief promise of "guaranteeing the completion of the task", I embarked on the hard road of "expanding the territory" of the Shaling project in Zhuqiao Town, Laizhou City.

One meter of footage is a heavy burden

The main shaft of Shaling Gold Mine has a net diameter of 6.8 meters and a shaft depth of 1551.8 meters. It is located near Laizhou Bay. The geological conditions are extremely complex. Wait for the problem of "four highs, one big and one strong". The well is 840.5 meters deep, the wellbore water inflow is 27.17m³/h, and the water temperature is nearly 30°C; the well is 1400 meters deep, the wellbore water inflow is 31.34m³/h, and the water temperature is as high as 51°C. The construction difficulty is self-evident. , to endure ten years of hardship." "Torrential rain", "steamer", "bath", "hot spring", "sun sauna", "ice and fire" have become the most common words used by project workers, which vividly and truly reflect the harsh conditions of underground operations. Under such difficult conditions, under the high-risk and heavy pressure of "four stones sandwiching a piece of meat", we were digging one meter at a time, struggling day by day, and persevering year by year, until the China Coal Construction Group was established. Three imprints are branded in the deepest underground in Asia...

One achievement, many battles

Behind the shiny report card handing over the deepest shaft in Asia, it is the battles carried out by the Shaling group of China Coal people and nature in exchange for... "Battle of the Water Demon", Jingtong Chung The large amount of water will seriously dilute the commercial concrete and affect the quality of the well wall. Zhi Xinjian, the squad leader of the ash-fighting team, led a team of 13 people to take the initiative to ask for grouting to control the water. They worked continuously for more than 10 hours every day in the "heavy rain" environment of nearly 30 °C every day for more than 10 hours, exploring and trying hydraulic grouting and chemical grouting. Instead of the existing ordinary (ultra-fine) cement and other means, the combination of injection and masonry is adopted, which effectively controls the amount of water and ensures the construction quality of wellbore construction, excavation and masonry. "When the amount of water is under control, I feel at ease. Everyone's efforts are worth it." Zhi Xinjian said. "Fighting high temperature", as the depth of the wellbore increases, the operating temperature in the wellbore continues to increase, and the workers on the operating surface will sweat profusely in a short while, and the work clothes can be twisted with sweat. The 84 mine construction team members jokingly called "steaming the sauna every day - detoxification and beauty", and they joked: "Not everyone can enjoy the 'welfare' of the deepest shaft in Asia. We must complete the construction task of wellbore excavation and masonry with quality and quantity. ". The project department installed the ground mechanical cooling and refrigerating device in time and installed the special frequency conversion fan for the tunnel to control the working temperature of the working face at 25 °C. The working conditions and environment of the workers have been greatly improved. Although the work clothes are always beaten by sweat Wet, but the workers said contentedly: "With the cool breeze, work is more exciting." "Battle-deep vertical shaft upgrade". "The conditions of the underground brothers are so difficult, we must ensure the safety of deep vertical wells for transportation." Zhou Song, the electromechanical manager, often recites this sentence at the mobilization meeting. At this time, two 5-meter-diameter shaft sinking hoists and six 40-ton load stabilizing trucks are running smoothly on the construction site to protect the vertical shaft; the personnel of the electromechanical team are conducting regular safety inspections on the wire ropes, and a special person is assigned to be responsible for the stabilization of the shaft. The wire rope is oiled; the wire rope real-time flaw detection monitoring device and the well-sinking and vehicle-stabilizing backup protection device researched and installed by the project department ensure the safety of 2,000-meter wellbore lifting and transportation at all times.

More than innovation, the mission is on the shoulders

When the main shaft of Shaling was dug up to 1527 meters, everyone knew that every subsequent process represented the leadership of mine technology and the demonstration of construction strength, and every one meter down would create unprecedented performance. Since then, all the cadres and workers of the three Shaling projects of China Coal Construction Group have a stronger sense of pride and responsibility. They must complete the mission of building the deepest mine in Asia, let everyone think and work hard, and fully implement the responsibility for safe production. Strictly control every process and every link in the production until the wellbore is safely and smoothly bottomed out, and the difficulty of 1551.8 meters has been successfully overcome.

The main well of Shaling has been safely and successfully landed, and congratulations to China Coal Construction Group and the three divisions have come one after another. After this test, it once again proved the combat effectiveness of the "Mine Construction Ace Army" under China Coal Group.

The 1,551.8-meter-long Shaling shaft has become a thing of the past. The three locations of China Coal Construction Group are advancing towards a new depth, and the glory will continue. The mark of China Coal's deepest shaft extends to the center of the earth. Editor/He Yuting