Twenty-three people have been arrested by ICAC officers at the Home Ownership Scheme construction site in Tin Shui Wai during the past two days.
The arrests follow allegations that two crane operator syndicates were taking bribes from subcontractors.
The Independent Commission Against Corruption (ICAC) probe began in July after information that some crane operators employed by a construction company had solicited and accepted tea money from subcontractors.
The payments were in return for speeding up the transporting of building materials to prevent delays which could result in heavy financial losses.
Investigations said the bribes, paid in monthly instalments, amounted to between $70,000 and $80,000.
An ICAC spokesman said those arrested - 14 crane operators and nine subcontractors - had been released on bail pending further inquiries.