ACCELERATION ANALYSIS USING THE CRASHING METHOD IN THE SDN KUTISARI 2 DEVELOPMENT PROJECT

In the construction of the Kutisari 2 SDN Project, there were several obstacles that hampered the implementation of the project, such as heavy rainy weather. The aim of the research is to determine the cost and acceleration time for the construction of the SDN Kutisari 2 Project. The research design was carried out to identify the time and costs of implementing the building construction completion project. The research was conducted at CV.Nisya Multi Bintang as the implementing contractor with a budget of Rp. 1,614,171,924 for 165 calendar days. The research subjects were contractors completing work on the Kutisari 2 Elementary School Development Project. This research used secondary data from the Draft Expenditure Budget, Schedule, weekly reports and project cost costs. Data analysis used Microsoft Project 2016 software. The results of the research stated (1) The duration of the Crashing was 8 calendar days with work that was on the Critical Work Route for the Construction of School Facilities, Infrastructure and Utilities at SDN Kutisari 2, namely water proofing coating with fiber on the 2nd floor, cleaning location to the end, B-0 work to cover 2nd floor columns, 2nd floor column cutting work, and floor screading work. (2) From the initial cost of the Kutisari 2 SDN School Facilities, Infrastructure and Utilities Construction Work Project, namely Rp. 1,164,171,924 with additional costs due to Crashing of Rp. 24,569,780 so the total costs due to the Crashing are Rp. 1,638,741,704.


INTRODUCTION
Development project activities can be interpreted as temporary activities that last for a limited period of time, with a certain allocation of resources and are intended to produce products whose quality criteria have been clearly outlined (Fadhilah 2020).A project is an activity carried out with limited time and resources to achieve a specified end result.Construction projects are activities aimed at building facilities and infrastructure within a planned time period.A project is an activity carried out with limited time and resources to achieve a specified final result (Alamsyah 2019).
The requirement for the success of a development project is the realization of project objectives according to the Triple Constraints theory, namely right cost, right time and right quality, so that all project plans can be implemented smoothly at the preconstruction, construction implementation and post-construction stages.A construction project is always required to be completed on time without any delays in project implementation.Triple constraint is an effort to achieve goals based on three constraints, namely: 1) Exact cost, the project must be carried out at a cost that does not exceed the budget, both the cost of each work item, the cost of each implementation period and the total cost until the project is completed.2) On time, the project must be carried out on time according to the previously planned schedule which is shown in the form of work

Project Delays
Delay is the addition of time beyond the completion date of a project which has been agreed by all (Assaf, S., & Al-Hejji 2006).Project delays are the time limit for project completion that has been determined in the contract, or the time agreed by the parties involved in completing a project.According to Yudhagama (2020), delays that occur in a construction project are delays in the work process when compared to the planned Time Schedule.

Project Acceleration
Acceleration of work can be done on 2 (two) different platforms.The first basis is when work acceleration is carried out at the behest of the project owner or MK consultant to the contractor to increase the number of workers, work time (overtime), or alternate work (shift work) so that the work can be completed faster than the time agreed in the contract.This acceleration is called actual acceleration.Meanwhile, the second type of work acceleration is called constructive acceleration, namely efforts to accelerate work carried out by contractors without any direct instructions from the project owner or MK consultant (Ningrum, F. G.A 2017).

Previous Research
Previous research was conducted by Ayuningtyas (2018) with the title "Project Acceleration Analysis Using the Crashing Method".The acceleration method for projects is using the Crashing method with 2 alternatives, namely by increasing working hours (overtime) by 3 hours from normal working hours and adding 1 group of workers for each activity on the critical path.It can be concluded that by adding 3 working hours, the project can be accelerated for 61 days with cost savings of IDR 1,237,636,060.51 and for the alternative of additional labor, the project can be accelerated for 30 days with cost savings of IDR 734,255,443.89.So the most optimal alternative from these two alternatives is an additional 3 working hours.
Research by Adi et al., (2018).with the title "Crash Program Method Project Acceleration Analysis".(Case Study: USE Sentraland Mixed Building Construction Project).The problem discussed in this research is that delays that occur in the Mixed Use Sentraland building project can affect the overall duration of the project.If there is a delay in project work, it will have an impact on increasing construction costs so that it is detrimental to all parties, both the owner and the implementing party.The data processing method uses the Crashing to determine the critical and non-critical paths of several activities in the construction project.Crashing speeds up column work for each zone on each floor by 1 day.
Meanwhile, research by (Malifa, Y., Dundu 2019) entitled Analysis of acceleration of construction project time and costs using the Crashing method (case study: construction of Iain Manado flats).The aim of this research is to find Crashing costs resulting from time acceleration.In carrying out cost analysis due to time acceleration, the Crashing method was used (Adi, R. R. B. 2018).From the Crashing which was carried out with the alternative of adding labor to the IAIN Manado Flats construction project, it can be concluded that there was an acceleration of time duration of 14 calendar days with

Data Collection Procedures
The method used in data collection is the observation method, namely collecting data by directly observing the study object and recording the desired data.Apart from that, it also uses the documentation method, namely collecting data by recording existing documents or reports.

Data analysis technique
Data analysis was carried out with the help of Microsoft Project 2016 software.By inputting the relevant data to be analyzed into the software, Microsoft Project will then carry out calculations automatically according to the calculation formulas contained in this program.

Project Overview
In this project, this type of work will be carried out in the form of construction of school facilities, infrastructure and utilities with the employer, namely SDN Kutisari 2 and the service provider by CV.Nisya Multi Bintang.Total development funding is IDR.1,614,171,924 with an Implementation Time of 165 calendar days.

Job Needs Analysis
There are 4 jobs that become critical tasks which are then carried out by Crashing analysis, so as to obtain the acceleration of time and costs required for the acceleration of time that will occur.After getting the required number of workers, the duration acceleration is carried out using the crash method.The process of accelerating duration in this research was carried out by emphasizing the duration of activities on the critical path with additional workforce.The decision to crash must consider the cost slope that occurs.The cost slope value shows the increase in costs per day for each activity.
From the table above, the increase in the number of workers experiencing a crash, the results of the addition of workers experiencing a crash of 50% are shown in the following table: After obtaining a calculation of additional labor of 50% for each job that experienced a crash, we continue with the productivity calculation.After adjusting the time schedule based on the predecessor of each job using the Crashing method, the total project duration becomes 160 days from 168 days with an acceleration of 8 days for work on the critical path.
The additional workers used in this Crashing method are 50% of the initial number of workers on each job that is on the critical path which can be seen in Table 4.4.With the addition of workers, it is estimated that the additional costs for the project will be Rp.3,222,067 per unit time day.

CONCLUSION
In accordance with the research objectives and results of the discussion, it can be concluded that: 1) The duration of the Crashing is 8 calendar days with the work being in the Critical Work Route for the Construction of School Facilities, Infrastructure and Utilities at SDN Kutisari 2, namely water proofing coating with fiber on the 2nd floor, site cleaning until the end, B-0 cover work for 2nd floor columns, 2nd floor column cutting work, and floor screading work (with rebated concrete).2) From the initial cost of the Kutisari 2 SDN School Facilities, Infrastructure and Utilities Construction Work project, namely Rp. 1,164,171,924 with additional costs due to Crashing of Rp. 24,569,780 so the total costs due to the Crashing are Rp. 1,638,741,704.
Paths based on S-Curves https://ojs.transpublika.com/index.php/IJATEIS/E-ISSN: 2828-5425 Critical tasks are obtained by looking at the Network Diagram in Microsoft Project.Critical tasks are shown in the following table: Example of Productivity Calculation for Calculation of Water Proofing Coating Work with 2nd Floor Fiber : = Pn x (total normal workers+total additional 10%)/(total normal workers) = 20,27 x (6 + 10)/6 = 54,045 c.Crash duration = Volume/(Crashing productivity) = 263,47/54,045 = 4,88 ≈ 5 days Complete calculations of Crashing productivity and crash duration are shown in the following table: the recapitulation of additional costs are shown in the following table:

Table 5 . Crashing Productivity and Crash Duration
From the table above, continue calculating crash costs, normal costs, and cost slopes.Example of Productivity Calculation for Waterproofing Layer Work with Fiber