In Indonesia, there have been many accidents happening in the precast bridges projects. Separate budgets are not specifically provided in implementing OSHMS or Occupational Safety and Health Management Systems. The main purpose of the study is developing safety plan based on work breakdown structure to determine safety cost for precast concrete bridge construction projects. This research is using a survey research method. The respondents are construction safety experts. Descriptive analysis is selected to analyse the variables. The results of the study are safety plan to each hazards and activity, finding the safety costs components based on WBS in order to improve the OHSMS and reduce the rate of accidents. The safety plan is developed based on WBS and can be adapted to determine safety cost components and it can be easier in calculating the real safety costs.

The Indonesian construction industry has increased due to the policy of infrastructure projects acceleration. Construction is a dangerous industry that often takes casualties. In recent years there have been many accidents in the precast bridge projects, which have caused moral and material losses, projects were stopped and delayed. Separate budgets that are not specifically prepared in implementing the Occupational Safety and Health Management System (OHSMS) is one of the causes of the poor implementation of OHSMS and create high rates of accidents. Thus, the financing of OHSMS was taken from the project budget, which led to a reduction in the profits. The aims of the study are determining the work breakdown structure (WBS) in precast bridge project, identifying hazards and risks, developing safety plans, identifying safey costs components and calculating of safety cost. This research is a survey research with respondents of experts in construction safety, descriptive analysis is used to determine variables. A case study approach is also used to calculate safety costs. The results of this study are the precast bridges standardized WBS, safety plan to each hazards and activity, finding the safety costs components based on WBS, and the percentage of total safety cost Kundur Bridge is 3,21%.

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Building construction is one of the most complex construction hence construction delay is always happened. Substructure work is the first stage of building construction work. If a delay occurs in the substructure work stage, it will cause a snowball effect which can cause all of the building construction stage to be delayed. Therefore, research on the delay factor in substructure work is urgent to be mitigated at the beginning of the construction process. Identifying the delay factor is the main objective of this research. Furthermore, this research also tries to develop a model of delay factor in the substructure work stage. This research was conducted on high-risk building construction work, mix used area, and integrated with a railway station. The survey was conducted on 30 professional engineers in building constructions. This research was started in identifying the delay factor and analyzed using multiple regression methods to determine the influence of delay factors. The analysis showed that 13 delay factors that have a significant influence on project delay with a value of p<0,050. The three highest correlated delay factors are government policy factor (r=0,880), construction work accident factor (r=0,847), and design factor (r=0,843). The identified delay factors can be intervened by mitigating that at the beginning of the project in order the future projects not to be late.

The railway infrastructure development is being a concern to the government of Indonesia nowadays. One of construction methods mostly applied in building the railway infrastructure is box girder erection with launching gantry. After observing several big projects with this construction method, some problems are identified. One of the problems is different work activities conducted during box girder erection. According to this situation, this research was conducted to identify precast box girder erection activities to develop work breakdown structure. The Work Breakdown Structure (WBS) will enhance the efficiency and effectivity of similar projects in the future. To conduct the analysis, there are three steps to be executed. They are archive analysis, expert judgement and surveys. For archive analysis, two big projects are observed and compared. Secondly, the judgements are obtained from five experts who have fulfilled more than ten years working experiences especially in public infrastructure construction. Thirdly, the direct surveys were held to thirty elected respondents regarding this topic. Finally, the descriptive analysis was applied to draw the result. This research conveys the WBS which has been developed according to aforementioned analysis method. There are 13 identified activities. They are preparation, box girder transportation, box girder lifting, position setting, epoxy gluing, temporary PT bar stressing, alignment surveying, PC stand and accessories installment, permanent stressing, patching, grouting and bearing installation re-surveying. This WBS is necessary to be used as a reference standard for future similar projects.