Why is China Construction Bank called China Construction Bank instead of Chinese? Also, what is the usage of Construction here? If

Strictly speaking, china and chinese have different scopes of application. For example:

When reading newspapers, we will encounter china policy and chinese policy. The former refers to the policies adopted by other countries towards China (policies towards China), while the latter refers to the policies adopted by China towards other countries (policies towards China). China’s policy toward the United States and Japan). Therefore, using china is more in line with the understanding of other English-speaking countries.

CCB is just a noun phrase composed of three nouns, with no words of other nature.