INDUSTRY INFORMATION

The prohibition of mining river sand is one of the important measures to protect the safety of the Yangtze River channel and the ecology of water bodies. This will directly reduce the supply of river sand, and the scale of infrastructure construction in China is getting larger and larger. It is imperative to promote the use of mechanism sand to replace river sand. So why is building sand so tight? In the field of transportation infrastructure construction, what is needed to fully promote the use of machine sand?

The construction sand is mainly river sand. Due to over-exploitation of inland sand and gravel for many years, the river's ecological environment and safety are overwhelmed, and sandstone resources are almost exhausted. According to the requirements of the Ministry of Water Resources, sand mining is prohibited from the main stream below the Yibin River in the Yangtze River from June 1 to September 30. In response, the Henan Provincial Department of Water Resources issued a notice requesting research on the mechanism sand market to provide data support for the decision-making of mechanical sand instead of natural sand.

The prohibition of mining river sand is one of the important measures to protect the safety of the Yangtze River channel and the ecology of water bodies. This will directly reduce the supply of river sand, and the scale of infrastructure construction in China is getting larger and larger. It is imperative to promote the use of mechanism sand to replace river sand.

开Mining river sand affects water ecology and safety. Construction sand has its own special standards. Sand, sea sand and mountain sand in the desert have their problems. The best choice is river sand. River sand is a non-renewable resource in the short term, and its mining volume will be smaller and smaller, but the amount of sand and gravel is increasing. According to Sun Satellite, secretary general of the China Sand and Stone Association, the demand for aggregates of sand and gravel in China was more than 12 billion tons in 2013, and reached 20 billion tons in 2017. In the next three to five years, the demand for sand and gravel will grow slowly. The sandstone gap will be more prominent. The gap between supply and demand has caused the price of river sand to soar. In May this year, the price per ton of coarse sand in Shanghai Huangpujiang Port reached 114.3 yuan. As environmental protection inspectors become more and more strict, the prohibition of mining river sand becomes a consensus. According to Ma Dianguang, a researcher at the Inland River Port Engineering Research Center of the Tianjin Water Transport Engineering Research Institute of the Ministry of Transport, river sand mining has destroyed the living environment of aquatic organisms, causing not only a large amount of river sand to rise, but also the water body becoming cloudy and affecting the survival of fish and shrimp. And the plants on the coast are killed in large numbers. After these plants are washed into the river, the water environment is further deteriorated, which affects the aquatic environment.

In addition to ecological problems, the massive exploitation of river sand has also caused problems such as geology and safety, and has also led to the problem of illegal sand mining. River sand is the foundation of the river bed. Excessive exploitation of river sand will lead to a large number of riverbed subsidence, river bank collapse, interruption, and rapid changes in runoff and other geological disasters. Geological disasters can also cause river banks to collapse, threatening the safety of bridges and dams, and creating great security risks. In August 2013, Longmen Village, Chaoyang Township, Qixing District, Guilin City, collapsed to the Lijiang River on the bank of a hundred meters long, and the maximum width of the collapse reached 10 meters. The investigation found that there was a large amount of sand mining in the vicinity.

“The amount of river sand mining will become smaller and smaller, and the mechanism sand will become a new direction for building sand.” Peng Sports, deputy chief engineer of the China Communications Highway Planning and Design Institute Co., Ltd. and the second division of the international business, believes that there are many mountainous areas in China and the mechanism sand technology is mature. Switching to machine sand in the field of transportation infrastructure construction will become an important way to solve the shortage of construction sand.

The mechanism sand technology has a low maturity cost. After more than 50 years of research, the mechanism sand technology has become more and more mature, and the application of the mechanism sand concrete engineering has been continuously expanded and gradually accepted by people. China's mechanism sand preparation equipment, mechanism sand concrete technology is mature, high-quality mechanism sand concrete can be comparable to natural sand concrete. In addition, the cost of mechanism sand is low. In Guizhou, for example, the cost of mechanism sand is about 60 yuan per ton. No in-situ production is required, and the wear of equipment is small. The life of wearing parts such as mixers and pump trucks can be extended. /3, in terms of environmental protection, economy, resource utilization, etc., have unique advantages.

At present, the mechanism sand concrete technology is very mature. More and more people realize that the difference between mechanical sand and river sand is not the focus, and the focus is on the various indicators of concrete. Breaking the prejudice against the mechanism sand, the whole industry will give support and encouragement, and the mechanism sand will be widely promoted nationwide.

China Communications News Network 03/07/2018