Composition of construction cost
I. Composition of Project Cost
The construction cost of water conservancy project refers to the sum of all production costs incurred in the construction of water conservancy project.
The construction cost of water conservancy projects includes direct costs and indirect costs.
2. Calculation basis of project cost: unit price of foundation, charging standard and unit price analysis.
(1) Basic unit price: including labor budget unit price, material budget price, construction machinery use fee, electricity, wind and water budget price (basic price, energy loss/facility maintenance amortization fee), sand and gravel material unit price and concrete material unit price. (talent machine, wind power, sand and gravel concrete)
Production electricity (water) directly enters the project cost. Domestic electricity (water) is not included in the fee.
Labor budget unit price = (basic salary+auxiliary salary+salary surcharge)/(? Working hours/days)
2, P 140 tender offer fill in the project unit price = direct cost (talent machine)+construction management fee+profit+tax+risk factors.
(2) Comprehensive coefficient =( 1+ other direct rate+on-site capital rate) ×( 1+ indirect rate )× (1+enterprise profit rate )× (1+tax rate )× (1+tax rate)
Construction quota
A, water conservancy project quota classification
2. Budget estimate quota: the quota for predicting the project cost in the preliminary design stage.
3. Budget quota: it is the basis for preparing the construction drawing budget/pre-tender estimate and quotation in the bidding stage.
4. Construction quota: it is an important basis for enterprises to prepare bidding quotation and cost management. There are three quotas: people, materials and machines.
Second, other material costs are based on the main material costs.
Three, the use of quota should pay attention to the problem P 148
1, specialist; 2, engineering quota and cost quota supporting use; 3, the quota types should be adapted to the design stage.
Fourth, the automobile transportation quota: above 10km, it is calculated by the coefficient of 0.75; The artificial mechanical adjustment coefficient of I/II soil is 0.9 1, and that of IV is 1.09.
When compiling the unit price of earthwork excavation, the bulldozer bulldozing quota shall be drawn up according to the natural party. For example, when bulldozing, the quota is multiplied by the adjustment factor of 0.80. The excavation quota of excavators and loaders is based on the nature of excavation and loading. For example, when excavating and loading loose soil, the adjustment coefficient of manual and excavating and loading machinery is 0.85, and the gravel is Class IV soil. The time of ventilator in the earthwork excavation quota of flat-hole inclined shaft should be considered within 200m of the length of a working face, and when it exceeds 200m, it should be adjusted according to the coefficient (calculated by insertion method) specified in the quota. The transportation quota of dump trucks for excavators, wheel bucket excavators or loaders to dig and load soil (including channel earthwork) is applicable to Class III soil.
Grouting technology
Classification: consolidation (surface layer: diluted first and then concentrated, 0.3-0.5MPa, to improve the mechanical properties of bedrock and reduce foundation deformation; Shallow, low pressure)/Curtain (row: forming impervious curtain, deep, high pressure)/Contact (strengthening the combination degree and integrity between the building and the contact surface, improving stability)/Chemical (polymer, which can enter the crack of 0. 10mm)/High pressure jet grouting: first break the soil, then stir and then solidify. Treatment methods of composite foundation formed by cohesive soil: compaction method, mixing pile and jet grouting pile.
Material: solid particles/chemical grouting material
Mode: 1 pure pressure type 2 circulation type
Process/Requirements: drilling, flushing, water pressure test (single point method, accounting for more than 5% of the total number of holes, pressure and permeability), grouting (first dilute, then dense), hole sealing and quality inspection.
Construction sequence (added on 20 17)
1. Consolidation grouting of dam foundation with cover weight shall be carried out after the concrete reaches the required strength.
2, foundation grouting must be carried out in the order of consolidation first, then curtain. (Prevent curtains from cracking)
3. The hydraulic tunnel grouting shall be carried out in the order of backfilling grouting, consolidation grouting and joint grouting.
The above is the Summary of Test Sites of Water Conservancy and Hydropower Engineering for the Second-level Constructor Examination brought by Bian Xiao. If you want to know the information about other test sites that the second-level constructor must remember in the exam. Pay attention to Bian Xiao's timely push.