SÃ O PAULO—Three former executives from one of Brazil's largest construction conglomerates were sentenced Monday for money laundering and other charges for their roles in a graft ring that targeted state-controlled Petró leo Brasileiro SA.

The sentences mark the first handed down to senior executives from the building industry in the massive bid-rigging-and-bribery scheme.

Dalton Avancini, 48 years old, the former president of Sã o Paulo-based Construtora Camargo Corrê a, was convicted of corruption, money laundering and belonging to a criminal conspiracy.

A federal judge sentenced him to 15 years and 10 months of house arrest as part of a plea bargain that helped the former executive avoid prison in exchange for providing information about the alleged scheme.

Federal Judge Sé rgio Fernando Moro handed down an identical sentence to former Carmargo Corrê a Vice President Eduardo Leite, 49, who was convicted of the same charges and made a similar deal.

Plea bargains have become a key tool for prosecutors in the corruption case. So far, at least 18 cooperation agreements have been signed as part of the investigation, according to prosecutors.

Mr. Avancini and Mr. Leite are both candidates for probation, which might allow them to leave their homes in exchange for good behavior, Judge Moro said.

Camargo Corrê a former Chairman Joã o Auler, who didn't strike a plea deal with prosecutors, was sentenced to nine years and six months in prison. The 63-year-old is currently being held in the southern city of Curitiba.

Lawyers for the three executives couldn't immediately be reached for comment. In a statement, Camargo Corrê a said it has, since the beginning of the investigation, offered to collaborate with authorities and is also improving its corporate governance and control systems. Petrobras has said it is a victim of the scheme and is cooperating with authorities.

The men were arrested last November as part of Operation Car Wash, an investigation into alleged wrongdoing by suppliers to Petrobras. According to prosecutors, several large Brazilian construction firms formed a cartel to drive up the prices of Petrobras-related contracts, paying kickbacks to company insiders and politicians who helped them skim billions of dollars from the oil giant.

Since Operation Car Wash began in March 2014, four former Petrobras executives and at least 23 construction executives have been charged with crimes including corruption and money laundering.

Some have admitted wrongdoing in exchange for lesser punishment, prosecutors say, while others have denied involvement and await trial. The operation has also reached some politicians, who are under investigation.

Write to Rogerio Jelmayer at rogerio.jelmayer@wsj.com and Luciana Magalhaes at Luciana.Magalhaes@dowjones.com

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