JRSSEM 2022, Vol. 02 No. 6, 1048 – 1062

E-ISSN: 2807 - 6311, P-ISSN: 2807 - 6494

DOI : 10.36418/jrssem.v2i06.364 https://jrssem.publikasiindonesia.id/index.php/jrssem/index

ANALYSIS OF FUNCTION IMPROVEMENTS DUE TO

CHANGES IN CORE ZONE MATERIAL BASED ON VALUE

ENGINEERING AT URUGAN BATU DAM

Dhania Kusumastuti

Agus Suroso

Student, Faculty of Civil Engineering, Mercubuana University, Indonesia

Lecturers, Faculty of Civil Engineering, Mercubuana University, Indonesia

e-mail: dhaniakusumastuti@gmail.com, agus_suroso@mercubuana.ac.id

*Correspondence: dhaniakusumastuti@gmail.com

Submitted

: 15

December 2022

Revised

: 13

January 2023

Accepted

: 25

January 2023

Abstract: An embankment dam is a large artificial embankment made by placing and

compacting various compositions of soil, sand, clay or rock. One of the rock fill dams located

in the Buleleng Regency, Bali Province, namely the Tamblang Dam which is planned to be

utilized to meet the raw water needs in the Buleleng Regency in particular and the Bali Province

of 510 liters/second, irrigates irrigated rice fields in Bungkulan and in Bulian with an area of

588 Ha, as a micro hydro power generator of 2 x 269 MW, as well as other uses for flood control

and tourism. At first the Tamblang Dam was a rock fill dam with an upright core made of clay

material. After conducting test pits at 30 borrowed areas and soil investigations at an

independent laboratory, the volume of the core zone material according to specifications

cannot meet the needs of the core material. There are alternative solutions to the problem,

namely bringing in core zone material from outside the project site or changing the original

clay core design into an asphalt concrete core. This study applies the Value Engineering (VE)

method in which an increase in function at a fixed cost or an increase in function will be

obtained by reducing costs or reducing costs for a fixed function or increasing costs and

increasing functions.

Keywords: Dam; Value Engineering; Clay; Asphalt Concrete.

Dhania Kusumastuti

Agus Suroso

| 1049

INTRODUCTION

The selection of urugan-type dams in

Indonesia is not only supported by their

topography, the availability of material is

also adequate so that it is more economical

than other types of dams. Besides having

great and more economical benefits,

urugan-type dams can also bring danger in

the event of dam failure because they are

heavy construction. To avoid the

occurrence of collapses in urugan dams, it

is necessary to analyze the stability of the

dam both at the time of design, during the

implementation and operation of the dam

(Azdan and Samekto, 2008).

Tamblang Dam is one of the dams in

Indonesia located in Bali Province and a

rock urugan dam type with an upright core

that has a dam peak elevation located on

El. +185 m with a peak length of 260 m, and

a height of 68 m from the bottom of the

deepest foundation. Tamblang Dam

located in the Tukad Daya watershed is

planned to be used to meet raw water

needs, especially in the Buleleng Regency,

Bali Province, raw water of 510 liters /

second, irrigating irrigated rice fields in

Bungkulan and in Bulian covering an area

of 588 ha, as a micro hydro power plant of

0.38 MW, as well as other uses as flood

control and tourism.

Tamblang Dam was originally a rock

urugan dam with an upright core with clay

material. After pit tests at 30 points and soil

investigation in an independent laboratory

at the prospective borrow area location, the

clay parameter values in the form of Plastic

Indek and Permeability did not meet the

engineering specifications.

MATERIALS AND METHODS

Tamblang Dam, most of the constituent

material is in the form of random rock

urugan which has an upright core divided

into 6 (six) zones, namely zone 1 is an

impermeable core, zone 2 is a fine filter,

zone 3 is a coarse filter zone, zone 4 is a

rock heap, zone 5 is a random rock, zone 5a

is a random weathered rock and zone 6 is a

rip rap pair that can be seen in Figure 2.8 so

that it belongs to the type of rock urugan

dam with an upright core (BWS Bali Penida,

2022).

Figure 1. Cross section of the core zone with loamy soil

(Source : BWS Bali Penida,2021)

1050 | Analysis of Function Improvements Due To Changes In Core Zone Material Based on

Value Engineering at Urugan Batu Dam

Figure 2. Cross Section of the Core Zone with Concrete Asphalt

(Source : BWS Bali Penida,2021)

An overview of the layout of the Tamblang

dam consisting of the main dam body,

evasion tunnel, spillway, intake, and outlet

can be seen in figure 4.3 below.

Figure 3. Tamblang Dam Layout

Figure 4. Research Flowchart

Dhania Kusumastuti

Agus Suroso

| 1051

RESULTS AND DISCUSSION

A. general description

The overall scope of Tamblang

Dam construction work includes

preparatory work, entrance, and road

inspection work, evasion tunnel work,

main dam

work,

spillway

building

work,

intake

building work,

hydromechanical work, facility

building work, and other works.

Technical data of the work – the work

based on the results of a detailed

design review

is:

1. Reservoirs

a. River Name: Tukad Daya

b. Inundation Length: 2,236 Km

c. Luas DAS: 78,63 Km

d. Inundation Area: 35.9 H

e. Total Spool Volume: 7.6m

f. Effective Spool Volume: 5.6m

g. Dead Spool Volume: 2.0m

h. Minimum Water Level Elevation:

+161.0 m

i. Normal Water Level Elevation: +179.5

j.Maximum Water Level

Elevation:+182.2 m

2. Main Dam

a.Type: Urugan Stone With Upright

Core

b. Waterproof Layer Position and Type:

In the Middle

c. Flood Discharge Q1000: 712 m

d. PMF Flood Discharge: 1514 m

e.Foundation Type: Rocks

f.Height of the Deepest Foundation

Base: 68 m

g. Height From the Bottom of the

Deepest River: 66 m

h. Dam Volume: 960,184

- Core and

Coffer Dam

: 94,502.44m

- Fine Filter: 50,991.62 m

- Coarse Filter: 44,085.94

- Rock Heap: 905,619.74 m

- Rip Rap: 23.915,08 m

i.Peak Elevation: 185 m

j.Peak Length: 260 m

h.Peak Width: 12 m

i.Upper Slope: 1H : 2.25

j. Slope of Downstream Slope: 1H : 2.0

k.High Care: 2.8 m

3. Evasive Building

A. Cofferdam

a. Type: Stone Heap

b. Peak Elevation: El 142.0

c. Height of the Deepest Foundation:

27 m

d. Panjang Puncak: 140 m

e. Debit Plan (Q25):1.10

B. Terowongan

a.Type: Horseshoe Tunnel

b.Elevasi Inlet: El 128.00 m

c.Elevasi Outlet: El 118.90 m

d.Diameter: 4.50 m

e.Panjang: 355 m

4. Spillway Building

a. Type: Side spillway, OGEE type

lighthouse

b.NoDoor/doorless/combination: No

Door

c.Kapasitas (m3/dt): 712 m

/dt

d.Elevation of Mercu (m): + 179.50 m

e.Lighthouse Length (m): 70 m

f.Launcher Channel Length (m): 209.82

g.Energy Reducer Type: Sky Jump

1052 | Analysis of Function Improvements Due To Changes In Core Zone Material Based on

Value Engineering at Urugan Batu Dam

NO. URAIAN PEKERJAAN BIAYA

1 PEKERJAAN PERSIAPAN Rp4.333.908.570

PEKERJAAN JALAN MASUK DAN JALAN INSPEKSI

Rp85.347.122.742

3 PEKERJAAN TEROWONGAN PENGELAK Rp89.847.705.471

4 PEKERJAAN BENDUNGAN UTAMA (MAIN DAM) Rp267.316.158.764

5 PEKERJAAN BANGUNAN PELIMPAH (SPILLWAY) Rp216.498.393.889

PEKERJAAN BANGUNAN PENGAMBILAN (INTAKE)

Rp19.321.590.477

7 PEKERJAAN HIDROMEKANIKAL Rp31.225.155.820

8 PEKERJAAN BANGUNAN FASILITAS Rp11.342.325.522

9 PEKERJAAN LAIN-LAIN Rp6.250.749.596

A JUMLAH BIAYA Rp731.483.110.853

B. Cost Data

At the information stage, the

Budget Plan (RAB) for the construction

work of the Tamblang dam as a whole

assuming the initial availability of

sufficient material at the Tamblang

dam area site.

Table 1. Overall Tamblang Dam Construction RAB (assuming sufficient material needs in the

Tamblang dam area)

(Source: BWS Bali Penida,2021)

In the construction work of the

Tamblang dam core zone, one

alternative solution to the problem

of clay material needs is to bring in

material from outside the project

that has a high Plasticity Index to

mix with the core material in the

borrow area located around the

Titab Dam which is approximately

60 km from the Tamblang Dam

location. The cost estimate is based

engineer's estimate

if the

construction of the Tamblang dam

construction by bringing in clay

material which is approximately 60

km from the Tamblang dam is as

follows:

Table 2. Tamblang Dam Work Rab Overall (bringing in clay soil material from outside)

(Source: Own Processed Products)

NO. URAIAN PEKERJAAN BIAYA

1 PEKERJAAN PERSIAPAN Rp4.333.908.570

PEKERJAAN JALAN MASUK DAN JALAN INSPEKSI

Rp85.347.122.742

3 PEKERJAAN TEROWONGAN PENGELAK Rp89.847.705.471

4 PEKERJAAN BENDUNGAN UTAMA (MAIN DAM) Rp341.670.183.704

5 PEKERJAAN BANGUNAN PELIMPAH (SPILLWAY) Rp216.498.393.889

PEKERJAAN BANGUNAN PENGAMBILAN (INTAKE)

Rp19.321.590.477

7 PEKERJAAN HIDROMEKANIKAL Rp31.225.155.820

8 PEKERJAAN BANGUNAN FASILITAS Rp11.342.325.522

9 PEKERJAAN LAIN-LAIN Rp6.250.749.596

A JUMLAH BIAYA Rp805.837.135.793

Dhania Kusumastuti

And Suroso

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DOI : 10.36418/jrssem.v2i06.364 https://jrssem.publikasiindonesia.id/index.php/jrssem/index

Specifically, the work of the

Tamblang dam core zone includes

main coffer dam work (dewatering

and earthworks), and

main dam

work consisting of dewatering work,

earthworks, stockpile work,

instrumentation work, supporting

equipment for operation and

maintenance, miscellaneous work,

jetty and trash boom

work. Based

the engineer's estimate

, the

following is the Cost Budget Plan

(RAB) for the

main coffer dam

workand the main dam work

with

clay soil material imported from

outside:

Table 3. Main Dam Work Rab at Tamblang Dam (Material imported from outside)

(Source: Own Processed Products)

C. Pareto Analysis

The following is the result of

a thorough analysis of the

Tamblang Dam Construction

Pareto assuming it brings in clay

material from outside the project

area:

Table 4. Thorough Pareto Analysis of Tamblang Dam

(Source: Own Processed Products)

NO. URAIAN PEKERJAAN BIAYA

PEKERJAAN MAIN COFFER DAM Rp14.116.595.176

A. PEKERJAAN DEWATERING Rp200.000.000

B. PEKERJAAN TANAH Rp13.916.595.176

PEKERJAAN BENDUNGAN UTAMA (MAIN DAM ) Rp327.553.588.527

A. PEKERJAAN DEWATERING Rp370.000.000

B. PEKERJAAN TANAH Rp39.154.259.513

C. PEKERJAAN TIMBUNAN Rp217.679.733.517

D. PEKERJAAN DRILLING DAN GROUTING Rp50.692.331.226

E. PEKERJAAN INSTRUMENTASI Rp11.188.368.000

F. PERALATAN PENUNJANG OP Rp3.804.692.908

G. PEKERJAAN LAIN - LAIN Rp3.326.513.580

H. PEKERJAAN JETTY DAN TRASHBOOM Rp1.337.689.784

Rp341.670.183.704

JUMLAH BIAYA

BIAYA KOMPONEN

KUMULATIF BIAYA

KOMPONEN TOTAL

PROSENTASE

KOMPONEN

PEKERJAAN

KUMULATIF

PROSENTASE

KOMPONEN

PEKERJAAN

(Rp.) (Rp.) (Rp.) (Rp.)

PEKERJAAN BENDUNGAN UTAMA (MAIN DAM) 341.670.183.704

341.670.183.704 11% 11%

PEKERJAAN BANGUNAN PELIMPAH (SPILLWAY) 216.498.393.889

558.168.577.593 11% 22%

PEKERJAAN TEROWONGAN PENGELAK 89.847.705.471

648.016.283.065 11% 33%

PEKERJAAN JALAN MASUK DAN JALAN INSPEKSI 85.347.122.742

733.363.405.807 11% 44%

PEKERJAAN HIDROMEKANIKAL 31.225.155.820

764.588.561.627 11% 56%

PEKERJAAN BANGUNAN PENGAMBILAN (INTAKE) 19.321.590.477

783.910.152.104 11% 67%

PEKERJAAN BANGUNAN FASILITAS 11.342.325.522

795.252.477.626 11% 78%

PEKERJAAN LAIN-LAIN 6.250.749.596

801.503.227.223 11% 89%

PEKERJAAN PERSIAPAN 4.333.908.570

805.837.135.793 11% 100%

TOTAL 805.837.135.793 100%

NO.

KOMPONEN PEKERJAAN

1054 | Analysis of Function Improvements Due To Changes In Core Zone Material Based on

Value Engineering at Urugan Batu Dam

Figure 4. Overall Tamblang Dam Pareto Graph

(Source: Own Processed Products)

The following is the result of

Pareto's analysis of the

construction of the core zone of

the Tamblang Dam, especially on

the

main dam

work by bringing

in clay core material from outside

the project area:

Table 5. Pareto Analysis of Main Dam Work (

Main Dam

)

BIAYA KOMPONEN

KUMULATIF BIAYA

KOMPONEN TOTAL

PROSENTASE

KOMPONEN

PEKERJAAN

KUMULATIF

PROSENTASE

KOMPONEN

PEKERJAAN

(Rp.) (Rp.) (Rp.) (Rp.)

1 PEKERJAAN TIMBUNAN 217.679.733.517 217.679.733.517 13% 13%

2 PEKERJAAN DRILLING DAN GROUTING 50.692.331.226 268.372.064.743 13% 25%

3 PEKERJAAN TANAH 39.154.259.513 307.526.324.256 13% 38%

4 PEKERJAAN INSTRUMENTASI 11.188.368.000 318.714.692.256 13% 50%

5 PERALATAN PENUNJANG OP 3.804.692.908 322.519.385.164 13% 63%

6 PEKERJAAN LAIN - LAIN 3.326.513.580 325.845.898.743 13% 75%

PEKERJAAN JETTY DAN TRASHBOOM 1.337.689.784 327.183.588.527 13% 88%

8 PEKERJAAN DEWATERING 370.000.000 327.553.588.527 13% 100%

TOTAL 327.553.588.527 100%

NO.

KOMPONEN PEKERJAAN

Dhania Kusumastuti

Agus Suroso

| 1055

Figure 5. Main

Dam

Works Pareto Graph

(Source: Own Processed Products)

- Function Analysis Stage

The results of identifying the

function of the core zone of the

urugan batu dam are as follows:

Table 6. Identification of Dam Core Zone Functions

(Source: Own Processed Products)

Then the Function Analysis

System Technique

(FAST) is carried

out to see the identification of basic

functions and complementary

functions by compiling the

functions in the

Fast Diagram

follows:

Kata Kerja Kata Benda

Meningkatkan Fleksibilitas

Mengurangi permeabilitas

Mengoptimalkan Keamanan

Menahan Rembesan

Mengendalikan Deformasi

Mencegah Erosi

Fungsi

Komponen Pekerjaan

Zona Inti Bendungan

Dhania Kusumastuti

And Suroso

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DOI : 10.36418/jrssem.v2i06.364 https://jrssem.publikasiindonesia.id/index.php/jrssem/index

Figure 6.

Fast Diagram

Before Function Addition

(Source: Own Processed Products)

- Creative Stage

The Fast diagram

presented

below is a series of functions of the

core zone of the urugan batu dam,

where there is no function of

avoiding

piping

which can increase

the safety of the dam without

adding construction work items.

Figure 7.

Fast diagram

after function addition

Source : Self-Processed Products

HOW WHY

Technical FAST Diagram Before Additional Function

Input

Ouput

ANALISIS ESTIMASI BIAYA KONSTRUKSI

AKIBAT PERUBAHAN MATERIAL ZONA INTI

Pek. Tanah

Pek. Timbunan

Pekerjaan Lain - Lain Melapisi pondasi Melindungi pondasi Keamanan

Mendukung pekerjaan

Mendampingi

Pelaksanaan

Pengawasan

Tenaga Kerja Asing, Tenaga

Lokal Desain, Supervisi

Menahan Rembesan

Mempertahankan Struktur Keamanan dan Kekuatan

Kekuatan Pondasi

Zona Inti

Mendukung beban

Meneruskan beban ke

atas dan bawah

Kekuatan

Pek. Bendungan

Utama (Main Dam)

Pek. Instrumentasi

Mengoptimalkan

keamanan

Memantau perilaku Keamanan

ANALISIS ESTIMASI BIAYA KONSTRUKSI

AKIBAT PERUBAHAN MATERIAL ZONA INTI

BERBASIS VALUE ENGINEERING DAN LIFE CYCLE COST

PADA BENDUNGAN URUGAN BATU

Mengendalikan deformasi

Meningkatkan

Fleksibilitas

Mengurangi risiko

kegagalan

Mengurangi risiko

kerusakan

Pekerjaan Penunjang

Mengoptimalkan

pengelolaan

Mengatur maintenance

Life Time

HOW WHY

Technical FAST Diagram After Additional Function

Input

Ouput

ANALISIS ESTIMASI BIAYA KONSTRUKSI

AKIBAT PERUBAHAN MATERIAL ZONA INTI

Pek. Tanah

Pek. Timbunan

Pek. Lain - Lain Melapisi pondasi Melindungi pondasi Keamanan

Mendukung pekerjaan

Mendampingi

Pelaksanaan

Pengawasan

Tenaga Kerja Asing, Tenaga

Lokal Desain, Supervisi

Menahan Rembesan

Mempertahankan Struktur Keamanan & Kekuatan

Kekuatan Pondasi

Zona Inti

Mendukung beban

Meneruskan beban ke

atas dan bawah

Kekuatan

Pek. Bendungan

Utama (Main Dam)

Pek. Instrumentasi

Mengoptimalkan

keamanan

Memantau perilaku

Keamanan

ANALISIS ESTIMASI BIAYA KONSTRUKSI

AKIBAT PERUBAHAN MATERIAL ZONA INTI

BERBASIS VALUE ENGINEERING DAN LIFE CYCLE COST

PADA BENDUNGAN URUGAN BATU

Mengendalikan deformasi

Meningkatkan

Fleksibilitas

Mengurangi risiko

kegagalan

Mengurangi risiko

kerusakan

Material Alternatif

PenghematanAspal Beton

Mengoptimalkan

pengelolaan

Mengatur maintenance Life Time

Pekerjaan Penunjang

Mencegah penuaan

Dhania Kusumastuti

Agus Suroso

| 1057

The addition of the core zone function of the urugan batu dam is as follows:

Table 7. Addition of Dam Core Zone Functions

(Source: Own Processed Products)

- Evaluation/Discussion Stage

In the evaluation stage, an

evaluation of the results of the

application of

value engineering

changes in the material of the

Tamblang dam core zone has been

obtained at the stages that have

been carried out previously.

Life

Cycle Cost Analysis.

The opinions of

5 (five) experts in the field of water

resources are required using the

questionnaire instrument as

attached. The selected experts are

personnel who have a dam

expertise certificate (SKA Dam),

undergraduate education level (S1),

and experience of more than 5 (five)

years of dam construction work as

well as dam operation and

maintenance activities. Experts fill

out questionnaires by giving

statements of agreeing or

disagreeing with each indicator and

sub-indicator, and experts can

provide responses/suggestions to

the indicators and sub-indicators

presented.

Based on the filling of the

questionnaire by 5 (five) experts

related to what factors support the

analysis of construction cost

estimates due to changes in core

zone materials based on

value

engineering

and

life cycle costs

the urugan batu dam, the following

are the validation results from 5

(five) experts consisting of PT

Supervision Consultants. Mettana,

Contractor of PT. PP (Persero),

Directorate General of Water

Resources, Ministry of PUPR which

includes from the Dam Engineering

Center, the Directorate of Dams and

Lakes, and the Directorate of

Operation and Maintenance

Development.

Kata Kerja Kata Benda

Menghindari Penuaan/piping

Zona Inti Bendungan

Komponen Pekerjaan

Penambahan Fungsi

1058 | Analysis of Function Improvements Due To Changes In Core Zone Material Based on

Value Engineering at Urugan Batu Dam

Table 8. Expert Questionnaire Recap

(Source: Own Processed Products)

- Recommendation Stage

A. Recommendations

1. First Alternative

An alternative solution to the

problem of insufficient needs for

clay core materials is to bring in

material from outside the project

that has a high Plasticity Index to

mix

with the core material in the

borrow

area. However, this

alternative has the potential to

require a considerable additional

cost because the borrow

area

approximately 60 km from the

Tamblang dam.

2. Second Alternative

Another alternative is to

replace the core material with

other materials such as concrete

asphalt which is an anti-seepage

(waterproof) part formed from

asphalt material, coarse

aggregate, fine aggregate, and

filler

. Concrete asphalt cores are

more waterproof than

clay cores

= 10-7 cm/s), where the

permeability coefficient ranges

from 10-8 - 10-10 cm/s

(ICOLD,

2018). Because the concrete

asphalt core is more waterproof

than the clay core, so the safety of

P2 P3 P4 P5

X1.1 Estimasi Biaya √ √ √ √ √ √

X1.2 Efisiensi Biaya √ √ √ √ √ √

X2 Life Cycle Cost

X2.1 Biaya Pemeliharaan √ X X √ X X

X2.2 Biaya Demolisi √ X X X X X

X3.1 Kedap Air (Menahan Rembesan) √ √ √ X √ √

X3.2 Potensi Erosi di zona inti yang menyebabkan piping √ √ √ X √ √

X4 Ketersediaan Material

X4.1 Pembebasan Lahan untuk Borrow Area √ √ √ √ √ √

X4.2 Alternatif Material √ √ √ √ √ √

X5 Penerapan Value Engineering

X5.1 VE Dapat Mengoptimalkan Kegiatan yang Telah Diprogramkan / Direncanakan √ √ √ √ √ √

X5.2 Penerapan VE terbatas hanya pada Proyek/Pekerjaan yang “Besar” √ X X X X X

X5.3 Jenis Proyek √ √ √ √ √ √

X5.4 Biaya Awal Proyek √ √ X X √ √

X5.5 Gambar Proyek √ √ √ X √ √

X5.6 Fungsi Bangunan dan Bagiannya √ √ √ √ √ √

X5.7 Permasalahan Proyek √ √ √ √ √ √

X5.8 Perbandingan antara Desain Awal dengan Desain Alternatif ditinjau dari Sudut Pandang Teknik √ √ √ √ √ √

X5.9 Perbandingan antara Desain Awal dengan Desain Alternatif ditinjau dari Sudut Pandang Biaya √ √ √ √ √ √

X5.10 Meneliti Item yang Berbiaya Tinggi/Dominan √ √ √ X √ √

X5.11 Gagasan Alternatif Item Pekerjaan/Metode Pekerjaan untuk Menghemat Biaya √ √ X √ √ √

X5.12 Memilih Alternatif yang Paling Memungkinkan dalam Penghematan Biaya √ √ √ √ √ √

X5.13 Menyusun Urutan Prioritas Alternatif sesuai dengan Penghematan yang Dihasilkan √ √ √ √ √ √

Kesimpulan

Pakar

Indikator/Sub Indikator

Variabel/

Sub Variabel

Keamanan bendungan

Biaya konstruksi

Dhania Kusumastuti

Agus Suroso

| 1059

the dam against seepage in the

core is safer and in terms of cost

more efficient because it does not

require land acquisition and

asphalt material is taken from

AMP which is located not far from

the Tamblang Dam project site.

B. Cost Savings Calculation

The following is a cost

estimate calculation based on

engineering estimate

calculations

of alternative substitutes for clay

soil material into concrete asphalt

in the construction of the

Tamblang dam core zone:

Table 9. Rab of Overall Tamblang Dam Work With Brbasis Concrete Asphalt Core Zone VE

(Source: Own Processed Products)

Table 10. RAB Main Works Dam With VE-Based Concrete Asphalt Core Zone

(Source: Own Processed Products)

NO. URAIAN PEKERJAAN BIAYA

1 PEKERJAAN PERSIAPAN Rp4.333.908.570

PEKERJAAN JALAN MASUK DAN JALAN INSPEKSI

Rp85.347.122.742

3 PEKERJAAN TEROWONGAN PENGELAK Rp89.847.705.471

4 PEKERJAAN BENDUNGAN UTAMA (MAIN DAM) Rp294.533.295.070

5 PEKERJAAN BANGUNAN PELIMPAH (SPILLWAY) Rp216.498.393.889

PEKERJAAN BANGUNAN PENGAMBILAN (INTAKE)

Rp19.321.590.477

7 PEKERJAAN HIDROMEKANIKAL Rp31.225.155.820

8 PEKERJAAN BANGUNAN FASILITAS Rp11.342.325.522

9 PEKERJAAN LAIN-LAIN Rp6.250.749.596

A JUMLAH BIAYA Rp758.700.247.158

NO. URAIAN PEKERJAAN BIAYA

PEKERJAAN MAIN COFFER DAM Rp14.116.595.176

A. PEKERJAAN DEWATERING Rp200.000.000

B. PEKERJAAN TANAH Rp13.916.595.176

PEKERJAAN BENDUNGAN UTAMA (MAIN DAM ) Rp280.416.699.893

A. PEKERJAAN DEWATERING Rp370.000.000

B. PEKERJAAN TANAH Rp39.154.259.513

C. PEKERJAAN TIMBUNAN Rp181.320.620.125

D. PEKERJAAN DRILLING DAN GROUTING Rp36.443.474.184

E. PEKERJAAN INSTRUMENTASI Rp11.740.647.500

F. PERALATAN PENUNJANG OP Rp3.804.692.908

G. PEKERJAAN LAIN - LAIN Rp4.465.115.880

H. PEKERJAAN JETTY DAN TRASHBOOM Rp1.337.689.784

I. TENAGA KERJA ASING, TENAGA LOKASL (DESAIN DAN SUPERVISI) Rp1.780.200.000

Rp294.533.295.070

JUMLAH BIAYA

1060 | Analysis of Function Improvements Due To Changes In Core Zone Material Based on

Value Engineering at Urugan Batu Dam

Table 11. Calculation of Increase/Cost Savings

(Source: Own Processed Products)

CONCLUSIONS

From the results of the analysis, the

following conclusions were obtained:

The application of value engineering to

the change of core zone material to

concrete asphalt of Tamblang Dam to

improve the function of the asphalt core is

more resistant to aging (wear) than clay

material. Clay core zone materials with a

lifespan of more than 50 (fifty) years have

the potential to piping. Meanwhile, based

on the construction of Concrete Asphalt

Core dams in Europe and China (ICOLD,

2018), over a period of 60 years since 1960

the construction of the first dam with

concrete asphalt cores in Germany, did not

show any leakage through the concrete

asphalt core.

Based on the research that has been

done, here are some suggestions that we

get, including:

There needs to be further research

related to the application of value

engineering to find out other factors to

increase the effectiveness of budget use.

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Weibiao Wanga, Kaare Hoeg. (2016).

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RAB Awal

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RAB Pekerjaan Keseluruhan 731.483.110.853Rp 805.837.135.793Rp 758.700.247.158Rp

RAB Pekerjaan Bendungan

Utama (Main Dam)

267.316.158.764Rp 341.670.183.704Rp 294.533.295.070Rp

Uraian Pekerjaan

Estimasi Biaya

Alternatif

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