Study On The Adjustment Of Construction Contract Price Based On Variation Of Engineering Quantity

The performance management level of the project has been reduced due to the construction project contract disputes.The reason is that due to the incomplete contract of construction project,when the risk events in the implementation process break the balance of the initial contract state,the two parties of the contract have a dispute on the adjustment of the contract price.Research shows that under the bill of quantities pricing mode,the settlement disputes between the two parties focus on the adjustment of the contract price caused by the change of the quantity of the project.Therefore,it is the key to settle the dispute between the two parties to analyze the factors which lead towards the variation of engineering quantity,as well as the scientific and reasonable calculation of the adjustment value of the contract price under the influence of the change of the quantity of the project.In view of this,this paper proposed the ISM method to study the relationship between the factors influencing the variation of engineering quantity and the specific influence ways,and also discussed the three kinds of engineering quantity changes,namely "new sub divisional work","discrepancy in BQ quantity" and "deletions to sub divisional work" and gave out the evaluation methods of them.The paper is organized as follows:First of all,the paper analyzed the concepts related to the contract price and the contract price adjustment,and also detailed explanation structure model and incomplete contract theory,which laid the theoretical foundation for the further research of the factors influencing the variation of engineering quantity and dynamic compensation of contract price under the influence of engineering quantity change.Secondly,the influence factors of engineering quantity change were analyzed by ISM method.On the basis of the risk analysis of construction cases with settlement disputes in recent years and combining relevant literature can identify the factors affecting the variation of engineering quantity,and used the ISM method to build a hierarchical structure model of influencing factors of project quantity which revealed the relationship between the various factors and the influence path of engineering quantity change.By analyzing the causes of the influence factors of engineering quantity change,this paper put forward the corresponding countermeasures to control the change of engineering quantity.Finally,this paper studied the concrete adjustment methods of the contract price on the new sub divisional work,the quantity deviation and the cancellation sub divisional work.Sub divisional work was divided into additional work and extra work,and discussed the price determination of additional work and extra work;the paper analyzed the influence of deviation of engineering quantity on unit construction cost based on the relationship between the quantity and the construction cost,thus summed up the necessity of adjusting the unit price under the influence of the deviation of engineering quantity,and constructed the adjustment formula of unit price under the influence of engineering quantity deviation based on the analysis of unit variable cost and unit fixed cost;according to the conditions of the compensation for the cancellation sub divisional work,the judgment procedure of the compensation for the cancellation sub divisional work is given,referring to the principle of claim under the scope of engineering change,the paper gave the concrete calculation method of the headquarters management fee and the profit compensation under the normal quoted price.The theme of this paper is to use the ISM method to study the relationship between the factors influencing the variation of engineering quantity and the specific influence ways,meanwhile,based on the principle of dynamic compensation,this paper put forward specific methods of contract price adjustment aiming at the new sub divisional work,the engineering quantity deviation and the deletions to sub divisional work,so as to standardize the contract payment behavior,provide reference to reduce the contract price adjustment disputes caused by the change of engineering quantity.