Does Employment Bonds are valid to staffs

Dear All,
I am working in an construction company and its products are production, laying, installation of pipes. In our organisation employer is signing an employment bonds with each an every on roll employees and staff. As it is an construction company most of working employees are engineers by profile.
As per Section 27 of the Indian Contract Act. Section 27 of the Indian Contract Act, 1872 prohibits any agreement in restraint of trade and profession. Any agreement in trade and profession according to Section 27 is void.
But does it also applicable to staff working in HR, Accounts, Admin?
Kindly help in this regard

Bonds are valid as long as the terms and conditions are reasonable and valid.
many companies provide training to their employees and spend money.
It is quite natural for company to seek to retain trained employees for a period of time or compensate if they choose to exit early.
A blanket statement saying it is not applicable to HR or admin would be difficult to make without knowing the terms and conditions of the bonds.