Sand and gravel aggregates used in span bridge construction

"The world's first span" Zhang Jinggao Yangtze River Bridge in Jiangsu officially started construction, the main span of 2300 meters, connecting Suzhou Zhangjiagang, Nantong Rugao, will become the world's largest span bridge after completion.

1. Zhang Jinggao Yangtze River Bridge Overview

It is understood that Zhang Jinggao Yangtze River Bridge project length of about 29.8 kilometers, which crosses the river section is 7859 meters long, including two channel bridges, respectively, for the main span of 2300 meters of the South Channel Bridge and the main span of 1208 meters of the North Channel Bridge, the South Channel Bridge will become the world's largest span bridge after completion. Zhang Jinggao Yangtze River Bridge has made continuous breakthroughs in new structures and techniques, filling many technical gaps at home and abroad, and greatly enhancing the global influence of China's bridge brands.

2.What materials are needed to build the bridge

The construction of Zhang Jinggao Yangtze River Bridge requires reinforced concrete, asphalt concrete, bridge steel, welding rods, high-strength bolts, etc., of which concrete is the most basic construction material. Concrete has excellent fire resistance and durability, and it can be modeled and designed into different components with very good overall performance.

Since concrete has so many advantages, what does it consist of? Concrete consists of water, cement, sand and gravel aggregates, reinforcing agents and so on. When making it, you have to prepare all the materials and then mix them according to the corresponding proportions. When it is evenly mixed, it can be used.

Today, we will mainly talk about sand and gravel aggregate, which is the constituent of concrete. At present, based on the protection of rivers, river sand mining is restricted, and mechanism sand has become the trend of future development.

3.How to Produce Mechanized Sand Aggregate

As a necessary material for the construction of bridges, the quality of mechanism sand aggregate directly determines the safety of the bridge project. Therefore, when we produce mechanism sand, we should ensure the quality of sand and gravel.

To produce high quality mechanism sand aggregate, we need the process flow as follows: select granite, tuff, gabbro and other hard rocks as the mother rock, through the vibrating feeder into the jaw crusher for coarse crushing, and then through the conveyor belt into the cone crusher for medium and fine crushing; and then into the impact sand making machine for crushing and shaping. This 3-stage crushing process can make the rocks fully crushed and shaped, which makes the finished products with excellent grain shape and reliable quality.

4.Configuration program example of mechanism sand production line

We take the configuration of 500 tons per hour mechanism sand production line as an example to introduce the production plan:

Stone: granite

Feed size: ≤300mm

Production line configuration: vibrating feeder + jaw + cone crusher + sand making machine + vibrating screen

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