MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO.Assignment No.01

Construction Management and PlanningLast Date for Submission: 13-12-2012

Question # 1: A Small one-story commercial building is to be constructed on the site of an existing small frame structure it is 30 ft by 60 ft in plan the existing and interior walls are of concrete block. The roof is comprised of bar joists on long-span bar joists covered with a steel roof deck, rigid insulation, and built-up roofing. The ceiling is a suspended acoustical tile. The floor is a concrete slab on grade with an asphalt tile finish. Interior finish on all walls is paint. The project has been broken down into 18 steps and a construction time estimate has been made for each as follows. These steps are not in any particular order. Draw a bar chart for this project.1. Demolition-Including the demolition of the present structure, removal of debris, and rough grading of the site. Time: 2 days.2. Foundations – The construction of the foundation for the new structure. Time: 3 days.3. Underground Services – The installation of water and sewer service from mains in the street. It is assumed that these services will be brought in under the structure within 30 ft width. Time: 1 day.4. Exterior Walls-The construction of the exterior block walls. Time: 6 days.5. Interior Walls – The construction of the interior block walls. Time: 3 days.6. Roof finish – Includes the installation of the long-span joists, the bar joists, and the steel roof deck. Time: 2 days.7. Roof Finish – Includes the installation of the rigid insulation on the steel deck and the installation of the built-up roofing. Time: 2 days.8. Floor Slab – Assumed to include fine grading, sand fill and compaction, membrane waterproofing, casting and finishing of the floor slab. Time: 3 days.9. Floor Finish – Includes the installation of asphalt tile and base mold. Time: 2 days. 10. Rough Plumbing and Heating – Includes the setting of the heating unit and rough ductwork, the installation of rough plumbing above the floor slab, vents, and so on Time: 3 days.11. Finish Plumbing and Heating – Includes the final installation of the heating radiators, controls, and so on, and the installation of the sink and water closet. Time: 4 days.12. Rough Electrical – The installation of conduit, service inlet and meter box, and so on. Time: 3 days.13. Finish Electrical – The installation of wire and fixtures. Time: 3 days.14. Rough Carpentry – The installation of rough door frames, display window framing and so on. Time: 2 days.15. Finish Carpentry – The installation of door trim, hanging of doors, and so on. Time: 4 days.16. Ceiling – The installation of the suspended acoustic ceiling. Time: 3 days.17. Display Windows – The installation of the display windows glass and metal trim. Time: 1 day.18. Paint – Painting of interior walls and trim. Time: 3 days.

Question #2 Although the bar chart has achieved wide acceptance as a planning tool, it still has limitations. Discuss these limitations and describe the objectives that a good scheduling system should achieve.

Question # 3(a) Construct the arrows diagram for the following sequence of activities. Label the activities in the network by activity letter and also by I and j number. Remove any redundancies. Label any dummies D – 1, D – 2, and so on. 1. Activities A and P start the project.2. When Activities F and G are finished the project is complete.3. Activities C, B, and N must be complete before Activity E can start.4. Activity G cannot start until Activity M is finished.5. Activities H and K can be done at the same time.6. Activity P immediately precedes Activities N, M, and L.

7. Activities B and C immediately follow Activity A.8. Activity H depends upon the completion of Activities B, C, L, M, and N.9. Activity F cannot start until Activities A, B, and E have ended.10. The finish of Activities H and K controls the start of Activity G.11. Activities P and L must be finished before Activity K can start.Q#2(b) Assume that the logic in the diagram of Figure Ex. 3.1 is correct. Locate and correct any diagramming errors. Redraw the arrow diagram in its correct form.

Question No 4. (c) Draw a network diagram on A-O-A.(a) Calculate Total Project Time (TPT);(b) Identify Critical Path (CP);(c) Identify the Non Critical Activities; and(d) Enlist the Paths in the Diagram.

Question No. 5(a) Set up a table and compute the early and late activity dates for the activities whose arrow network data is shown below. Compute the two float values from these activity dates and show them in the table. Star the critical activities.

Question No 6(b) Set up a table and compute the early and late activity dates for the activities whose arrow network data is shown below. Compute the two float values from these activity dates and show them in the table as well as on network diagram. Star the critical activities.

..

Question No 7a). Set up a table and compute the early start and early finish dates, the link lags, the two floats and the late start and late finish dates for the

Question No 8(b) Set up a table and compute the early start and early finish dates, the link lags, the two floats and the late start and late finish dates for the project whose relationships are given below. Identify the critical activities.

Question No 9(c). Set up a table and compute the early start and early finish dates, the link lags, the two floats and the late start and late finish dates for theproject whose relationships are given below. Identify the critical activities.

Question No 10 (a).

Question No 11(b).

Question No 12(c). Data for a simplified PERT network are given below. In addition, the value of (TE)1 is zero and (TE)10 is 48. Also the variance for the project duration is 3.17. All times are days

(a) Determine the Probability of completing the project within 45 and 52 days.

(b) Represent the expected distribution of TE values beneath the Standard Normal Distribution Curve and also shaded the area for the probability

(c) Determine the mean and standard deviation for Activity 4-8.(d) Determine the range or the early project finish which meets a probability range of 16 to 84 percent.

Question No 13 (a) The activities and their overlapping relationships for a sewage pumping stations are given below. Construct an overlapping precedence diagram for this project.

Question 14(b) For the overlapping precedence network who data are given below.

Draw the network diagram and calculate the project duration on the diagram and in the table format. Also show the non-critical activities with their float values.

Question 15(a) A speculator buys a site near the fringe of an industrial area in a large city for $10,00,000. Annual outgoings on the site for maintenance, fencing, watching, etc, amount to $45,000. it is estimated that the site will not be sold for 8 years, at which time that area is due for development. For what minimum price must the site be sold at that time so as to break even on the costs if the original purchase price and the annual outgoing could have been alternatively invested at 12% per year.Question 16(b) A speculator buys a site near the fringe of an industrial area in a large city for $10,00,000. Annual outgoings on the site for maintenance, fencing, watching, etc, amount to $45,000. it is estimated that the site will not be sold for 8 years, at which time that area is due for development. For what minimum price must the site be sold at that time so as to break even on the costs if the original purchase price and the annual outgoing could have been alternatively invested at 12% per year.Question 17 The board of directors of a manufacturing company has under consideration the erection of a building for the storage of finished products. They are advised that the two technically acceptable alternatives are for a reinforced concrete shell roof structure having an initial cost of $2,000,000 and for a steel-framed structure with a brick cladding for an initial cost of 1,350,000. the life of the concrete building is estimated to be 60 years and while there will be no maintenance costs for this building during the first 10 years, there will thereafter be an annual maintenance cost of $25,000. The life of the other building is estimated to be 20 years with an equivalent annual maintenance cost form completion of construction of $30,000. the salvage value of the concrete building is estimated at $60,000 and that of the steel-framed building at $20,000. An acceptable rate of return is assessed at 10%. Which the better economic proposition?

Question 18 In an economic concerned with the alignment of a new road, one of the alternatives to be evaluated

on the basis of equivalent annual cost consists of a bridge at an estimated cost of $1,000,000, an embankment costing $1,60,000, and other earthworks at an estimated cost of $28,000. Maintenance on the earthworks and the embankment is estimated to reach an annual cost of $20,000 over the first 4 years of its service and then to drop to $10,000 for every year thereafter. Maintenance on the bridge is expected to remain constant throughout its life at a figure of $50,000 a year. What is the total equivalent uniform annual cost of this alternative if the life of the bridge is estimated at 60 years, the life of the earthwork and the embankments is in perpetuity and the interest rate to used is 15%.?

*****Wish You Good Luck*****