A Washington area construction firm official was found guilty by a federal judge here yesterday of charges of lying to a U.S. grand jury that is investigating bribery and corruption allegations against former D.C. Superior Court Judge Robert H. Campbell.

Convicted of three counts was Robert P. Jenkins, 47, of 1141 Bob-O-Link Circle, Great Falls, Va. He was indicted in September as part of an 18 18-month investigation into allegations that Campbell fixed large numbers of tickets for overweight trucks for Excavation Construction Inc.

Jenkins is secretary of the multimillion-dollar Prince George's construction firm, which recently filed for reorganization under bankruptcy law.

Jenkins was convicted in the non-jury trial before U.S. District Judge John H. Pratt after another Excavation Construction employe, trucking superintendent Walter F. Jones, Jr., testified under a grant of immunity that Jenkins had directed him to perform certain favors and take other actions in connection with Campbell.

Jones said he had been told by Jenkins to help move the judge's household belongings from one part of the District to another and had been told to deliver about $150 worth of topsoil to the judge's new home. On two other occasions, Jones said, he went to the judge at Jenkins's behest to have some of the firm's trucks released from seizure after it had failed to pay tickets.

Jenkins was convicted of lying to thegrand jury about the move, the topsoil delivery and the contacts with the judge about the overweight trucks.

Assistant U.S. Attorney Theodore Shmanda of the major crimes division said Jenkins would be sentenced after a presentence investigation.