Study On The Construction Contract Sum Adjustment Method When The Price Of Production Factors Changes

Pricing based on bills of quantities and valuation was put into practice since2003inChina, and the code of bills of quantities and valuation for construction works is updatingalong with the development of construction market. The price changes of production factorshas become a risk that must be considered by project participants due to the long constructioncycle, and therefore a construction contract sum adjustment method dealing with the risk ofprice changes of production factors has to be put forward to solve the dispute generated by theadjustment of contract sum in the process of construction, improve the construction efficiencyand guarantee the healthy development of construction market.Using the price changes of production factors as an entry point, this paper conducts theresearches on construction contract sum adjustment method and comes to the followingconclusions:1) Analyzing the statistical market price information of labor, material and machine andgiving out the reason and trend of price changes;2) Presenting the three direct ways that influence construction contract sum when theprice of production factors changes, that is, sub-engineering fee, preliminary fee, other fee,and clarifying the content and method of construction contract sum adjustment in each way;3) Establishing the production factor price predicting model based on three exponentialsmoothing method, explaining the determination of the initial value and smooth coefficientand verifying the prediction results is of high accuracy by taking labor, steel bar and crane asexamples;4) Sorting out in statistics of the ratio of main production factors fees to constructioncosts in box shear multilayer structure, box shear high-rise structure and multilayer framestructure and coming up with the method for determining the influence degree of the pricechange on contract sum; 5) Setting up the contract sum adjustment procedure model under three influencing waysrespectively, raising a complete simple, practical construction contract sum adjustmentprocess and bring the using of prediction price forward to bidding phase can substantiallylower the adjustment range of contract sum.Studying of the adjustment method of construction contract sum provides a new train ofthought for bidding and contract sum adjustment during final account, and offers suggestionsto put the new method into application in construction market in our country.