Comparison of Drop Hammer Platform Costs in the Asian Games Jetski Venue Construction Project
Anjas Handayani, Fajar Sidiq Sunadi
Faculty of Engineering, Department of Civil Engineering, University of Mercu buana, Indonesia
[email protected], [email protected] Abstract
In the Venue Jetski construction work, there are 838 spun pile erection points with a depth of 23 meters which can be carried out with two different implementation methods, namely piling using a barge platform and grounding with seabed dumping for drop hammer piling tools. The purpose of this final project is to find out how much the cost comparison is spent on the spun pile erection work on the seashore between the implementation method using a barge and Seabed Dumping as a base for piling tools. And to determine the effect of sea water depth on the cost of piling the spunpile on the seashore. Based on the results of the analysis that has been done, it is found that the cost of implementing each method of work is Rp. 14,625,273,218. 38 for the work implementation using the method of mounting from the top of the barge and the amount of Rp.
7,255,563,329.09 for the implementation of the work using the method of mounting from the land. The elevation or depth of the seabed from the water level greatly affects the cost of the method of carrying out the erection that can be done. The deeper or lower the sea floor elevation from the water level, the more efficient the cost of carrying out the erection of the barge.
Keywords :
Barge, Piling Cost, Spunpile
1. Introduction
Based on Presidential Instruction of the Republic of Indonesia Number 3 of 2018 concerning the Acceleration of Development / Rehabilitation of Supporting Infrastructure and Facilities in Preparation for the Implementation of ASIAN GAMES XVIII in 2018 and ASIAN PARA GAMES III in 2018 (Instruksi Presiden (Inpres), 2018)including points of instruction to the Minister of Public Works and Public Housing to allocate the budget and build the Jetski Venue in DKI Jakarta which is needed for the holding of the 2018 Asian Games and take all the steps necessary to accelerate the construction of these infrastructure.
According to the initial plan, the construction of the jet ski venue in the form of an open pile pier and there is work to build an artificial beach and other supporting buildings, takes 12 months. However, the process of establishing the program and the process of appointing a service provider experienced several obstacles, causing the work implementation time to only be 8 months because the target of completing the work could not be postponed according to the schedule for holding the XVII Asian Games.
With this limited implementation time, the work of erecting 838 spun piles with a design depth of 23 meters is critical because the erection work is a predecessor for other works.
PT. Nindya Karya (Persero) as the implementing contractor appointed by the Ministry of Public Works and Housing to complete the construction work of the jet ski venue, carried out the erection work using the method of carrying out the erection of the barge, by previously removing the breakwater at the piling site, and excavating the seabed to obtain sufficient depth of sea water so that the draft of the barge is not anchored to the seabed and causes the barge to run aground.
However, in the middle of the erection of the erection work, the contractor changed the method of carrying out the erection by carrying out the piling from the land, previously carrying out the piling of the seabed so that the piling equipment could be placed on it and not submerged in sea water.
The choice of the two methods requires different implementation costs. In the contract owned by the executing contractor along with the bidding documents, the contractor is paid based on per meter of installed pile run, with details in the analysis of the unit price of work, there is a wage for piling at sea of Rp. 262,500.
and based on the contract owned by the implementing contractor, which refers to the construction service contract regulations in the government, including Regulation of the Minister of PUPR number 31 of 2018, in the General Conditions of Contract (SSUK) article 65.2 Construction Services Contract for Jetsky and Screen Construction Services in DKI Jakarta in the framework of the XVIII Asian Games which reads:
"The contract value / price has taken into account profits, tax burdens and overhead costs including the implementation of Occupational Safety and Health (K3) and all taxes, duties, levies, practical labor /
apprenticeship, insurance costs and other costs that must be paid by providers for implementation construction work package "
2. Research Methodology
Figure 1. Research Methodology Source: Research Data, 2020
In conducting this research, the researcher went through several stages described in the flow chart above, which each process has several activities, including:
1. Observation of the location: At this stage, the researcher first observes the project that he wants to research, the goal is to better identify the scope of the problem and the needs that need to be researched. The things observed include the location of the research, access to the location, the surrounding environment, natural conditions, and so on.
2. Problem identification: At this stage, the researcher will identify the problem from the observations that have been made.
3. Data collection: At this stage, the researcher will search and review existing data such as previous research, related statistical data, and necessary research journals. In addition to the existing data, the researcher also performed calculations to obtain other necessary data.
4. Confirmation and Re-checking: At this stage, the researcher will confirm and double-check the data that has been collected. The data collected must match what is required in the calculation.
Location Observation Identification of problems
Primary data Shop Drawing
Contract Dat Budgetary Quotation Method of Implementatio Implementation Approval
and attachments Implementation Repor
Secondary Data
Study of literature Previous Research Related Statistical Data
Data analysis Conclusions and
suggestions Start
Enough Data?
Document Confirmation
Not
Done
5. Data Analysis: At this stage, the researcher will perform calculations based on the data that has been collected. In conducting this analysis, researchers used Microsoft Excel software.
6. Conclusions and Suggestions: At this stage, the results of the above calculations will be made a conclusion which will contain the research results and also suggestions. At this stage the researcher also ends the process of the research flow being carried out.
The object of research is something that is of concern in a study, the object of this research is the target in research to get answers or solutions to problems that occur. The object of research in this study is the comparison of the spun pile erection method using a barge & hoarding in terms of costs in the jetski asian games venue construction project.
The data sources used in this study are:
1. Primary data, namely data obtained by direct observation at the research location. The primary data required in this study are the planning drawings, the implementation contract, the implementation budget, the implementation method, the implementation agreement and the work unit price analysis attachments.
2. Secondary data, this data is obtained from information related parties. The secondary data required is Heavy equipment specification data used, weather data, bathymetry, tides, wave height, and other data that affect the implementation of work.
3. Results and Discussion
In this study the authors estimate the possible amount of costs required for an activity based on available information. Detailed cost estimates are carried out by calculating the volume and cost of implementing the work volume unit in accordance with the PUPR Ministerial Regulation No.28 of 2016 (Peraturan Menteri Pekerjaan Umum dan Perumahan Rakyat Nomor 28/PRT/M/2016, 2016).
The discussion that will be carried out is to compare the cost of implementing the spun pile erection work on the jet ski venue project of 832 (depalan hundred and thirty-two) points in an erection area of approximately 14,450 square meters with two different implementation methods and requires different predecessor work.
Conventional cost estimation is obtained by the formula:
The unit price of wages, materials, and equipment rental refers to the 2020 market price and DKI Jakarta Governor Regulation No.10 of 2020 concerning the provincial sectoral minimum wage in 2020 (PERGUB Provinsi DKI Jakarta No 10, 2020).
3.1. Barging Method Cost Analysis
In the piling work with the implementation method using a barge, the thing that is the obstacle to the implementation of the Jetski Asian Games project is the depth of the sea floor it has. Based on the type of barge used, the barge measuring 120 feet, the depth of the sea floor that is owned is at least 3 meters from the lowest tide. (Jawat, 2016)
3.1.1. Dredging Volume Calculation
1. Based on the data from the tide survey report on the seawater at the erection location, it can be seen that the lowest tide level or what is called LWS (low water spring) is + 0.46m from the reference chart datum or LAT (lowest astronomical tide) which is also a reference point 0 (zero) in the bathymetric survey of the depth of the sea floor.
2. Make cross sections in the contour drawing at a distance of every 25 meters according to the erection area that requires seabed dredging work using the help of autocad software. So that there are a total of 15 cross sections.
Figure 2. Position of The Cross Section in The Contour Plan
"Total Price = Volume x Unit Price"
(source: processed by researchers 2020)
3. Based on the tide survey data and the barge specification data used, it is determined that the depth of the seabed is at least 3 meters from the lowest low tide level (LWS). So that it can be determined in the cross- sectional drawing of the seabed contour the dredging level is at -2.54m from the reference level.
Figure 3. Cross Section-1 Dredging (source: processed by researchers 2020)
4. From the results of the determination of the dredging level, the cross-sectional area of the dredging can be determined.
5. From the data on the cross-sectional area of the excavated cross-sectional area of 15 pieces, the following data are obtained
Table 1. Calculation of Dredging Volume No. Dredging Cross Section Area
(m²) Cut Distance (m ') Excavated
Volume (m³)
1 119.14 25 2,978.50
2 116.8 25 2,920.00
3 116.49 25 2,912.25
4 116.33 25 2,908.25
5 116.88 25 2,922.00
6 119.32 25 2,983.00
7 120.08 25 3,002.00
8 120.35 25 3,008.75
9 119.92 25 2,998.00
10 120.2 25 3,005.00
11 120.79 25 3,019.75
12 120.99 25 3,024.75
13 121.3 25 3,032.50
14 52.37 25 1,309.25
15 118.63 25 2,965.75
Total Volume Excavated 42,989.75
(source: processed by researchers 2020)
3.1.2. Calculation of the Cost of Dredging Work / Transfer Sea Bed Materials Based on the Minister of Public Works and Housing Regulation No. 28 of 2016
Researchers used an approach to estimate the cost of carrying out dredging work / water-based material removal based on the work unit analysis contained in the Regulation of the Minister of PUPR No. 28 of 2016 concerning Guidelines for Unit Price Analysis.
The calculation of the cost of carrying out the work of dredging / removal of the water base material required is
= Volume (m ^ 3) × unit price of work
= 42,989.75 m³ × Rp. 198,829
Dredging Work Costs = Rp. 8,547,597,958.68
3.1.3. Calculation of The Cost of Piling from The Top Of The Barge Based on The Minister of Public Works and Housing Regulation No. 28 of 2016
The calculation of the total cost of implementing the spun pile erection from the top of the barge is required
= Volume (m ^ 1) × unit price of work
= (Number of pile points (points) × depth of piles (m)) × unit price of work
= (838 dots × 23 meters) × Rp. 315,330
Erection Work Cost = Rp. 6,077,675,259.70
3.1.4. Calculation of Work Costs with the Implementation Method of Barge Erection
The total cost of work by the method of implementing the erection of the barge is calculated from the start of its predecessor work, namely the work of excavating the seabed. So that the overall cost of implementing this method is
= Dredging Work Costs + Erection Work Costs
= Rp. 8,547,597,958.68 + Rp. 6,077,675,259.70
= Rp. 14,625,273,218.38 3.2. Cost Analysis of Ground Erection Methods
In the erection work with the implementation method from land, the thing that becomes an obstacle is the sea level when the highest tide causes the piles and cranes to be submerged in sea water and cause damage to the tools. So that it requires predecessor work, namely hoarding using materials that can be taken from the seabed around the piling area until the height exceeds the highest tide level.
3.2.1. Calculation of Seabed Dumping Volume
1. Based on the data from the tidal survey report on the seawater at the erection location, it can be seen that the highest tide level or what is called HWS (high water spring) is + 0.98m from the reference chart datum or LAT (lowest astronomical tide) which is also a reference point 0 (zero) in the bathymetric survey of the depth of the sea floor.
2. Make cross sections of the contour drawing at a distance of every 25 meters according to the erection area that requires backfilling using the help of autocad software. So that there are a total of 15 cross sections.
Figure 4. Position of The Cross Section on The Contour Plan (source: processed by researchers 2020)
3. Based on the tide survey data, the level of seabed dumping is determined to reach the highest tide level, which is + 0.98m
Figure 5. Cross Section of The Embankment (source: processed by researchers 2020)
4. From the results of determining the dredging level, the cross-sectional area of the embankment can be determined.
5. From the cross-sectional area data of 15 pieces of the embankment, the following data are obtained Table 2. Dumping Volume Calculation
No. Dredging Cross Section Area
(m²) Cut Distance (m ') Excavated
Volume (m³)
1 53.47 25 1,336.75
2 55.77 25 1,394.25
3 56.07 25 1,401.75
4 56.23 25 1,405.75
5 55.7 25 1,392.50
6 55.34 25 1,383.50
7 52.61 25 1,315.25
8 52.36 25 1,309.00
9 52.78 25 1,319.50
10 52.5 25 1,312.50
11 51.9 25 1,297.50
12 51.73 25 1,293.25
13 51.44 25 1,286.00
14 20.28 25 507.00
15 44.43 25 1,110.75
Total Volume Excavated 19,065.25
(source: processed by researchers 2020)
3.2.2. Calculation of Cost of Works on Seabed Dumping / Transfer Sea Bed Materials Based on Minister of Public Works and Housing Regulation No. 28 of 2016
The calculation of the cost of carrying out the work of the fill / removal of the water base material required is
= Volume (m ^ 3) × unit price of work
= 19,065.25 m³ × Rp. 198,829
Stockpile Work Costs = Rp. 3,790,719,694.38
3.2.3. The calculation of The Cost of Erection from The Ground Based on The Minister of Public Works and Housing Regulation No. 28 of 2016
The calculation of the total cost of implementing the spun pile erection from the top of the barge is required
= Volume (m ^ 1) × unit price of work
= (Number of pile points (points) × depth of piles (m)) × unit price of work
= (838 dots × 23 meters) × Rp. 179,768
Erection Work Cost = Rp. 3,464,843,634.70 3.2.4. Calculation of Work Costs with The Land-Based Erection Method
The total cost of work with the land-based erection method is calculated from the start of the predecessor work, namely the Seabed Dumping work. So that the overall cost of implementing this method is
= Seabed Dumping Work Cost + Piling Work Cost
= Rp. 3,790,719,694.38 + Rp. 3,464,843,634.70
= Rp. 7,255,563,329.09 3.3. Cost Comparison
Comparison of Cost Effects of Changes in Sea Water Depth
From the cost analysis of each method and data changes made to determine the effect of sea water depth on the cost of the implementation method, the following is a recapitulation of the cost of the work:
Table 3. Recapitulation of Costs for Implementing Change Works
No. 1 2
Method used Erection From Barge Ground from the ground
Information With his predecessor work in the form of dredging the seabed
With his predecessor work in the form of seabed dumping Total Implementation Costs
According to Original Data Rp. 14,625,273,218.38 Rp. 7,255,563,329.09 Total Cost of Implementation
according to Depth Change Data
Rp. 11,040,490,394.66 Rp. 13,404,812,686.05 Source: Research Results (2020)
Based on the results of the cost analysis that has been carried out based on changes in depth data, it can be seen that the costs incurred from the method of implementing the piling work from the barge are more efficient than the method of implementing the piling from the land.
The reasons for the cost of the implementation method of piling from the barge to be cheaper than the method of carrying out the piling from the land are as follows:
1. Due to changes in depth, the excavated volume becomes less and the volume of seabed dumping increases.
So that it makes the piling cost from the barge more efficient than from the land, even though the implementation cost of piling from the barge is more expensive than the piling cost from land.
2. The deeper or lower the sea floor elevation, the more efficient the cost of carrying out the erection of the barge.
4. Conclusion
Based on the research conducted and the data held, the following results were obtained:
a. The cost of carrying out the piling in the jet ski venue project is more efficient using the piling tool base in the form of embankments, because the volume of piling is less than the volume of dredging, and the cost of renting a barge required during the piling implementation is quite expensive. The cost of implementing each of these work methods is Rp. 14,625,273,218.38 for the implementation of the work using the piling method from the barge and Rp. 7,255,563,329.09 for the implementation of the work using the ground piling method.
b. The elevation or depth of the seabed from the water level greatly affects the cost of the method of carrying out the erection that can be done. The deeper or lower the sea floor elevation from the water level, the more efficient the cost of carrying out the erection of the barge. And conversely, the shallower the sea floor elevation from the water level, the more efficient the cost of carrying out the erection of land using embankments. Based on the changes made to the sea floor elevation elevation data that is owned, it can be concluded that at a seabed depth of more than 1 meter from the lowest water level, the cost of carrying out the piling work from the top of the barge is more efficient.
References
Instruksi Presiden (Inpres). (2018). Percepatan Pembangunan/Rehabilitasi Prasarana dan Sarana Olahraga Serta Prasarana dan Sarana Pendukung Dalam Persiapan Penyelenggaraan Asian Games XVIII Tahun 2018 an Asian Para Games III Tahun 2018.
Jawat, I. W. (2016). Metode Pelaksanaan Pekerjaan Tiang Pancang Sistem Hidraulic Jack In (Studi: Proyek Kcu Bca Sunset Road Bali). Paduraksa, 05(01), 43.
Peraturan Menteri Pekerjaan Umum dan Perumahan Rakyat Nomor 28/PRT/M/2016. (2016). Pedoman Analisis Harga Satuan Pekerjaan Bidang Pekerjaan Umum.
PERGUB Provinsi DKI Jakarta No 10. (2020). Upah Minimum Sektoral Provinsi.
Biography
Anjas Handayani, She was born in jakarta on 09 March, 1977. She works as a lecturer at Mercu Buana University. She graduated for Bachelor’s degree majoring in Civil Engineering from Mercu Buana University in 1999 and obtained a Master’s Degree majoring in Civil Engineering with a concentration in Construction Management from Engineering, Construction Managemen, Construction Quality Managemen System. Until now, she is also actively working in one of the State-owned corporation in Indonesia.
Fajar Sidiq Sunadi, born in Depok on June 4, 1996, he studied civil engineering at Mercu Buana University and will graduate in 2021 and has experience working at PT. Bangun Prima Dimensi is engaged in the contractor sector (2014), PT Virama Karya (Persero) is engaged in Engineering Consultant and Construction Management (2015-2019). Currently, he is focused on being an entrepreneurial architect and engineering
consultant as a director at the company that named PT Ruang Tiga Bidang (2019-present). The projects being undertaken are at Ciputat Traditional Market, Panongan Public Health Center, Kelapa Dua Public Health Center, Tigaraksa Hospital, Ciputat Mini Stadium, Tigaraksa Public Health Center, Etc.
