Be careful, please do not verbally abuse fellow LYKs.
新界深圳廿六kilometers 要起高鐵360 億(2009 年價)
Let's be fair here. Hong Kong infrastructure project are always open to tender. International companies are able to bid for those projects.
Of course, the large Chinese constructions companies are now very experienced due to large amount of construction going on in China.
But your claim that HK infrastructure projects are always awarded to Chinese companies is not proven, even though there is nothing wrong for any country to award contracts to its own countries' companies.
Let's get to the facts. We just cannot find evidences that 中建設 or 中交建 get all the contracts.
Of course Chinese companies will get some contracts since HK's section needs to integrate with China's section in the future.
For example:
L.A. Firm Wins Design Contract for $2B Underground High-Speed Rail Terminus in Hong Kong
As we can see, the contracts of Hong Kong's express rail link are awarded to various Hong Kong, Chinese and foreign companies, not just Chinese companies.