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  <xs:element id="dy_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="dy_ContractWithCustomerLiabilityNet" abstract="false" name="ContractWithCustomerLiabilityNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_VerizonCommunicationsInc.Member" abstract="true" name="VerizonCommunicationsInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_CharterCommunicationsMember" abstract="true" name="CharterCommunicationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_LumenTechnologiesMember" abstract="true" name="LumenTechnologiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_TradeAccountsReceivableandCostsandEstimatedEarningsMember" abstract="true" name="TradeAccountsReceivableandCostsandEstimatedEarningsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_OtherNoncurrentDepositsandAssets" abstract="false" name="OtherNoncurrentDepositsandAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_ComputerHardwareAndSoftwareMember" abstract="true" name="ComputerHardwareAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_CommunicationsSegmentMember" abstract="true" name="CommunicationsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_BuildingSystemsSegmentMember" abstract="true" name="BuildingSystemsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" abstract="true" name="ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="dy_UtiliquestMember" abstract="true" name="UtiliquestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" abstract="true" name="FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
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  <xs:element id="dy_ThresholdOneMember" abstract="true" name="ThresholdOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_ThresholdTwoMember" abstract="true" name="ThresholdTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_AutomobileLiabilityAndGeneralLiabillityMember" abstract="true" name="AutomobileLiabilityAndGeneralLiabillityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_AccruedInsuranceClaimsLineItems" abstract="true" name="AccruedInsuranceClaimsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="dy_NumberofStateswithStateSponsoredInsuranceFund" abstract="false" name="NumberofStateswithStateSponsoredInsuranceFund" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="dy_InsuranceLiability" abstract="false" name="InsuranceLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_InsuranceCoverageThresholdPerPolicy" abstract="false" name="InsuranceCoverageThresholdPerPolicy" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_InsuranceLiabilityAnnualRetainedRiskOfLossUnderEmployeeHealthPlanPerParticipant" abstract="false" name="InsuranceLiabilityAnnualRetainedRiskOfLossUnderEmployeeHealthPlanPerParticipant" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_LesseeOperatingLeaseLeaseNotYetCommencedAnnualPayments" abstract="false" name="LesseeOperatingLeaseLeaseNotYetCommencedAnnualPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_AccruedConstructionCostsCurrent" abstract="false" name="AccruedConstructionCostsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_SeniorNotes450DueApril2029Member" abstract="true" name="SeniorNotes450DueApril2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_TermLoanAFacilityMember" abstract="true" name="TermLoanAFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_TermLoanBFacilityMember" abstract="true" name="TermLoanBFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_IncrementalFacilityMinimumMember" abstract="true" name="IncrementalFacilityMinimumMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_SwinglineLoansMember" abstract="true" name="SwinglineLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_BridgeFacilityMember" abstract="true" name="BridgeFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_DebtInstrumentVariableComponentAxis" abstract="true" name="DebtInstrumentVariableComponentAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="dy_DebtInstrumentVariableComponentDomain" abstract="true" name="DebtInstrumentVariableComponentDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_VariableComponentTwoMember" abstract="true" name="VariableComponentTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_DebtInstrumentCovenantComplianceConsolidatedLeverageRatio" abstract="false" name="DebtInstrumentCovenantComplianceConsolidatedLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="dy_UnrestrictedCashandCashEquivalentsCreditAgreementThreshold" abstract="false" name="UnrestrictedCashandCashEquivalentsCreditAgreementThreshold" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_DebtInstrumentCovenantComplianceConsolidatedInterestCoverageRatio" abstract="false" name="DebtInstrumentCovenantComplianceConsolidatedInterestCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="dy_AdministrativeAgentsPrimeRateAndSecuredOvernightFinancingRateMember" abstract="true" name="AdministrativeAgentsPrimeRateAndSecuredOvernightFinancingRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_CommercialLettersofCreditMember" abstract="true" name="CommercialLettersofCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_DebtInstrumentBaseRateFloorInterestRate" abstract="false" name="DebtInstrumentBaseRateFloorInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="dy_ConvertibleDebtClosingPriceDeterminationValue" abstract="false" name="ConvertibleDebtClosingPriceDeterminationValue" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="dy_ConvertibleDebtClosingTradingPricePer100" abstract="false" name="ConvertibleDebtClosingTradingPricePer100" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
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  <xs:element id="dy_PotentialCompensationExpenseForPerformanceBasedSharesIfPerformanceGoalsAreMet" abstract="false" name="PotentialCompensationExpenseForPerformanceBasedSharesIfPerformanceGoalsAreMet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="dy_ShareBasedCompensationByShareBasedPaymentAwardEquityAwardsOtherThanOptionsTargetAmount" abstract="false" name="ShareBasedCompensationByShareBasedPaymentAwardEquityAwardsOtherThanOptionsTargetAmount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
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  <xs:element id="dy_OtherCustomersMember" abstract="true" name="OtherCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_ConcentrationRiskThresholdPercentage" abstract="false" name="ConcentrationRiskThresholdPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="dy_PerformanceGuaranteeAndSuretyBondMember" abstract="true" name="PerformanceGuaranteeAndSuretyBondMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="dy_NationalTechnologyIntegratorsLLCMember" abstract="true" name="NationalTechnologyIntegratorsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
