BE225 PROJECT

BE225 Project



BE225 Project

Introduction

There are several styles of open web or hollow girder and column shapes, but in UK solid columns and girders have been used except in the comparatively few cases where one of the British constructions has been introduced by its UK agents.

In construction, plans may exist at several levels: corporate strategic plans, pre-tender plans, pre-contract plans, short-term construction plans, and long-term construction plans. These plans are different from each other; however, all these plans involve four main steps:

Performing breakdown of work items involved in the project into activities.

Identifying the proper sequence by which the activities should be executed.

Activities representation.

Estimating the resources, time, and cost of individual activities. (McGrath and Macmillan 2009 35-49)

The following was the cost of erecting a full column form including lining, plumbing, bracing and yoking, but excluding lumber and original construction:

1 carpenter, 3 hrs., at £0.25

£0.750

1 helper, 3 hrs., at £0.175

0.525

1 helper, 1 hr., at £0.175

0.175

1-5 boss carpenter, 3 hrs., at £0.30

0.180

———

    Total

£1.630

This gives a cost of £7.25 per M. ft. B. M. for erecting column forms.

The cost of erecting a full size girder form including lining, plumbing, bracing and setting six bolts was as follows:

2 carpenters, 5 hrs., at £0.25

£2.50

2 helpers, 5 hrs., at £0.175

1.75

2 laborers, ½ hr., at £0.15

0.15

¼ boss carpenter, at £0.30

0.375

———

    Total

£4.775

This gives a cost of £4.35 per M. ft. B. M. for erecting girder forms.

The reinforcement was erected inside the forms for both columns and girders. The cost of erection for one column was:

2 laborers, 4 hrs., at £0.15

£1.20

? foreman, 4 hrs., at £0.225

0.30

——

Total

£1.50

This gives a cost of about 0.22 cts. per pound for erecting column reinforcement, including the bending of the horizontal ties or hoops. The girder reinforcement was erected by piece work at a cost of £1.80 per girder—or about 0.08 ct. per pound.

The cost of girders and columns in place was thus about as follows:[Pg 521]

  Columns:

Per unit.

Per cu. yd.

Molding

£25.00

£12.50

Erecting

5.25

2.63

———

———

    Totals

£30.25

£15.13

  Girders:

Molding

£75.00

£15.00

Erecting

7.87

1.57

———

———

    Totals

£82.87

£16.57

(Lycett 2004 289-299)

Work breakdown structure (WBS)

The WBS is described as a hierarchical structure which is designed to logically sub-divide all the work-elements of the project into a graphical presentation. The full scope of work for the project is placed at the top of the diagram, and then sub-divided smaller elements of work at each lower level of the breakdown. At the lowest level of the WBS the elements of work is called a work package. A list of project's activities is developed from the work packages. (Dickinson 2001 518-527)

Effective use of the WBS will outline the scope of the project and the responsibility for each work package. There is not necessarily a right or wrong structure because what may be an excellent fit for one discipline may be an awkward burden for another. To visualize the WBS, consider Figure 2 which shows a warehouse construction project.

Figure 2: WBS and their description

As shown in Figure 2, level 1 represents the full scope of work for the house. In level 2, the project is sub-divided into its three main trades, and in level ...