METHOD STATEMENT Project Name

:

Province Bidder Name

: :

Dredging and Embankment of Ciliwung-Gunung Sahari Drain & Waduk Melati Sub-Project DKI Jakarta PT. BRANTAS ABIPRAYA (Persero)

DETAIL CONSTRUCTION OF WORKS ITEMS

Dredging and Embankment of River

CONSTRUCTION METHOD FOR DREDGING WORK - Construction; 1. Location;  Construction on 2 Site , Waduk Melati, Cideng Drain, Gresik Drain and Gunung Sahari Drain Dredging Works - Dredging and Disposal - Excavated garbage

Assumption:

1. Work by heavy equipment ( mechanically), Labors and Tools 2. Work location :Gunung Sahari Drain and Waduk Melati as according to the Drawing and BQ

Description

This work have to include all excavation in the line, grade, slope and elevation shown on the Drawing, boundary, removal, transportation, dumping and Spreading and grading in disposal area. At construction process, if Any damage to existing structure or facilities that is caused by Contractor’s operational, contractor will be repaired to the pre-project condition at the contractor’s expense All Construction will be execute as according to determined Technical specification in tender document

Works Sequences :

1. Preparation Work, include : - Preparation of Shop Drawing till get approval from Engineer - Preparation of Equipments work and man power / Labors

2. Measurement Before excavation started, must be done work of Measurement to know elevation and boundary plan of excavation. 3. Excavation Excavation must be done according to height line, grade, slope and elevation which is shown in Drawing. Equipments : 1. Excavator 2. Pontoon 3. Floating Barge 4. Dump truck 5. Tools

Dredging and Embankment of River

FLOW CHART of DREDGING WORK START

Determined & Measurement of work site

Determined Access Road into Work Site

Mobilization of Equipments & Personal

Excavation of river’s sediment / waduk’s sediment by Excavator on Pontoon & Temporary Disposal Separation the Garbage No Cek

Handling The material by Dump truck

Ok

Delivery and transport into Determined Disposal Area

Handling The material by Dump truck

Dumping in disposal area

Delivery and transport into Determined Disposal Area

Dumping in disposal area

FINISH

FINISH “If determined” Spreading & Grading by Buldozer

No Cek Ok

FINISH

Dredging and Embankment of River

Dredging, Sheet Pile & Capping Beam FOR waduk melati - Work Location

Work Direction

Construction; - All Construction Will be constructed from Up Stream up to Down stream - At first, Common excavation will construction - Continue by Sheet Pile Construction Dredging

Dredging and Embankment of River

Sheet Pile Construction

Dredging

Work Direction

1. Temporary Disposal

Temporary Disposal for Red Area Using Drain Existing

Temporary Disposal for Yellow Area using Container

Dredging and Embankment of River

Dredging for Red Area

Handling Excavated material into Temporary Disposal

Excavated Material

Traffic Handling to disposal area

Handling Location

Temporary Disposal

Excavated Material

Garbage

Separation Garbage - Use separator /screen to separate large size solid waste - Use Labor, floating pontoon ship and Tool or - Use Labor and tools in temporary disposal. For some location, Work by Excavator  Usually for this method for floating Garbage

Dredging and Embankment of River

-

Movable Floating barges by Tug boart

Access Road; - Problem 1. Existing Access Road already Owner by Third party. - Solution 1. Contractor will coordination to using that road from the owner. 2. Mediator by Project owner if needed 3. Any damage to existing structure & existing road or facilities that is caused by Contractor’s operational, contractor will be repaired to the pre-project condition at the contractor’s expense (even more better) 4. Handling and hauling of material excavated and garbage at mind night from 22.00 wib up to 05.00 wib

Existing Road Owner by third party

Routes for Dredged Material ; Jl. Kebon Kacang Jl. MH. Thamrin Jl. Merdeka Barat Jl. Majapahit Jl. Juanda Jl. Ciliwung Gunung Sahari

Dredging and Embankment of River

Handling and Hauling into disposal area - Excavated Material will be transported into disposal, Spreader and grading. Handling Material, Truck’s Dump must be equipped by Water Seal during transportation process, so that no debris of Excavated material on access road. -

Traffic management with traffic lights that have been there (intersection lights) and will be assisted with traffic management by contractor

-

Contractor will request and permissions using Ancol’s land to using access road for disposal of excavated material  determined to the tender document

-

For Garbage, Disposal as determined to the tender document or otherwise determined by Director  Bantar Gebang

Illustration

Spreading excavated material on disposal area

Dredging and Embankment of River

Dredging for Yelow Area - Excavated material will be used Container - Temporary Placed Container on Left Side ( West Side) of Melati basin - Separated Garbage by man and tool on temporary Disposal (Container) - Use separator /screen to separate large size solid waste - Use Labor and tools in temporary disposal. For some location, Work by Excavator  Usually for this method for floating Garbage - Container is Steel Plate and Profil L - Work is 24 hour - Movable Floating barges by tug boat

1.2 m 2.4 m 1.2 m

Dredging and Embankment of River

Handling

-

Separated Garbage by man and tool on temporary Disposal (Container)

Hauling to disposal area - Work is 22.00 wib up to 05.00 wib - Access Road; Problem 1. Some of Existing Access Road already Owner by Third party. There is Border by Fence Solution 1. Contractor will coordination to using that road from the owner. 2. Mediator by Project owner if needed 3. Any damage to existing structure & existing road or facilities that is caused by Contractor’s operational, contractor will be repaired to the pre-project condition at the contractor’s expense (even more better) 4. Handling and hauling of material excavated and garbage at mind night from 22.00 wib up to 05.00 wib

Dredging and Embankment of River

Existing Road Owner by third party

Design Container Unit that open in Side system based from Drag Line Method.

Spreading excavated material on disposal area

Type, capacity, Labor and Material Description

: Dredging and disposal

1) Labour

3) Production /

-

Foreman

=

-

Skill Labor

=

-

Labor

=

1 3

2) Material -

Non

Schedule

Item no hour /day 4)

m3

8

=

21.00

m3

/hour

Equipments -

Excavator Long Arm

=

=

168

m3

/day

-

Pontoon

=

3 Unit

-

Floating Barge

=

10 Unit

-

Steel Container

=

50 Unit

-

Tug Boat

=

3 Unit

-

Service Crane 15-25 ton

=

3 Unit

-

Dump Truck 16t

=

7 Unit

= As according to " Construction Schedule" that one of attacments in Tender Bid Document

Dredging and Embankment of River

301

3 Unit

Dredging, Sheet Pile & Capping Beam FOR GUNUNG SAHARI DRAIN

Sheet Pile 4.832 m

Dredging 5.100m

Construction Plan Stage 1 - All construction will be start from Up stream (Hulu) up to down stream (Hilir) - Construction for Dredging Will be constructed Form End Project (STA. 5+100) - Construction for Sheet Pile Will be constructed Form Jl. Mangga Besar (STA. 2+450) up to STA. 0+000) - Construction Will be Fontal (at same time)

Dredging and Embankment of River

EXISTING WEST SIDE

Site Visit on West Side River; - At many place, Existing link Road for parking vehicle - Almost for Business Area and residents - Many Building - Difficult for hauling - Many Electric Cable - On same place, that side of river, there is Existing Building as semi permanent and permanent - High Social cost - Possible for Contractor’s Office

Dredging and Embankment of River

EAST SIDE

Site Visit on East Side River; - Existing structure are 2 kind of them, there are 3 m and 5 m - Existing is Pedestrian road (Trotoar) and Planting - Some building as Gazebo - For Hauling can be reach from Existing Road - There are re-condition for temporary disposal after construction

Routes for Dredged Material ; Jl. Pos / Dr Sutomo Jl. Ciliwung Gunung Sahari Jl. RE. Martadinata Jl. Pelabuhan Ratu 1 Jl. Raya Ancol Baru

Dredging Type 1 1. Excavation & Hauling - Work at 22 – 05.wib - Movable Floating barges by winch Separation Garbage - Use separator /screen to separate large size solid waste - Use Labor, floating pontoon ship and Tool or - Use Labor and tools in temporary disposal. For some location, Work by Excavator  Usually for this method for floating Garbage Type From Floating barge min 20 m³ directly into Dump Truck by Mobile Excavator - Work can be happen, if Dredged material in temporary disposal has been finished loaded, and Construction of Dredging still continue. 1. Excavation

2. Hauling and Handling

Side of River

Excavation Lumpur

Temporary Place

Dredging and Embankment of River

Loading

Into Disposal Area

Dumping

Side View

Top View

Side View

Top View

Type 2 Loading to temporary placed - Excavator on Pontoon for excavation - Excavated material disposed on temporary disposed on Temporary Disposal by Floating Barge (Oil drum and Woo) - Other Excavator loading excavated material into dump truck - Dump truck delivery of excavated material into determined disposal area

Dredging and Embankment of River

1. Excavation - 24 work Hour - Movable Floating barges and Temporary Floating Barges from Oil Drum by winch Separation Garbage - Use separator /screen to separate large size of solid waste - Use Labor, floating pontoon ship and Tool or - Use Labor and tools in temporary disposal. For other location, Work by use Excavator  Usually for this method for floating Garbage

2. Hauling and Handling - Work hour at 22.00 – 05.00 wib - Garbage separation will be executed on Temporary Disposal and put on temporary garbage box by Labor and tools

Dredging and Embankment of River

-

Temporary Floating Disposal by Oil Drum, Wood, Board wood and Plastic to cover of Wood Movable Floating barges and Temporary Floating Disposal from Oil Drum by winch

1.5 m Max 50 m

3m

Type, capacity, Labor and Material Description

: Dredging and disposal

1) Labour

3) Production /

-

Foreman

=

-

Skill Labor

=

-

Labor

=

1 3

2) Material -

Non

Schedule

Item no hour /day 4)

m3

8

=

29.00

m3

/hour

Equipments -

Excavator, 0.8m3

=

=

232

m3

/day

-

Pontoon

=

2 Unit

-

Floating Barge

=

18 Unit

-

Excavator, 0.8m3

=

1 Unit

-

Dump Truck 16t

=

5 Unit

-

tools

=

1 Ls

= As according to " Construction Schedule" that one of attacments in Tender Bid Document

Dredging and Embankment of River

201

2 Unit

DREDGING UNDER THE BRIDGES - Construction From Up stream up to down stream - Construction in this location will be 2 Stage 1. Blow of Sediment /dredged material under Bridge Using Water Injection. Water Injection take water from river via Pipe intake and will blow on work site via Pipe Out Put 2. The material that moved will be dredged by excavator in other side 3. Movable Floating barges and Temporary Floating Disposal from Oil Drum by winch

Down Stream

Up Stream

Work Direction

Excavator take / excavation of sediment removal (have been blew by Water Injection)

Direction of Moving Sediment

Water Injection

Dredging and Embankment of River

FLOW CHART of DREDGING WORK UNDER BRIDGE START

Determined & Measurement of work site

Determined Access Road into Work Site

Mobilization of Equipments & Personal

Blow sediment by Water Jet

Separation the Garbage

No Cek Ok

Handling The material by Dump truck

Excavation by Excavator in other side of bridge

Handling The material by Dump truck

Delivery and transport into Determined Disposal Area

Delivery and transport into Determined Disposal Area

Dumping in disposal area

No Cek Ok

Dumping in disposal area

FINISH

FINISH “If determined” Spreading & Grading by Buldozer

No Cek Ok

FINISH

Dredging and Embankment of River

DREDGING ON - Gresik Drain - Cideng hulu drain Assumption - Construction by labor and Tools - Temporary Disposal by Container Equipment; @ Location - Container = - Dump Truck = - Mobile Crane = = - Labor Container

5 2 1 20

Unit Unit for Cideng drain and 1 Unit Person

1.2 m 2.4 m 1.2 m

Dredging and Embankment of River

Unit for Gresik

Illustration

Dredged Material -

Lansir & Loading

Garbage separation will be executed on Temporary Disposal and put on temporary garbage box by Labor and tools

Spreading excavated material on disposal area

-

Labor and Tools Placed Dredged material on temporary disposal (river bank)

Dredging and Embankment of River

To loading / bring of dredged material into temporary disposal

On Location where Loading and estafet by wagon can be executed, Dredeg can be assiten by Temporary floating (made by bambo and wood)

Hauling at 22.00 up to 05.00 wib

Dredging and Embankment of River

Dumping and spreading on CDF

FLOW CHART OF MANUAL DREDGING WORK START

Penentuan & Pengukuran Lokasi Pekerjaan

Penentuan Akses ke lokasi Pekerjaan

Mobilisasi Peralatan & Personil

Pek. Pengerukan Lumpur oleh Pekerja & Alat bantu

No Temporary placed Ex. Material kerukan di atas Bantara kali

Cek Ok Loading oleh Pekerja + alat bantu ke gerobak (langsir) & Dari gerobak ke dalam bak dump truck Transportasi material ex. Kerukan ke lok. pembuangan / disposal area

Dumping di lokasi pembuangan / disposal area

FINISH

Perapian di damping Area oleh Buldozer & Excavator

No Cek Ok

FINISH

Dredging and Embankment of River

“Item ini di bayar tersendiri”

CONSTRUCTION PLAN FOR DAILY STORAGE OF SOLID WASTE (Bigger than 30 x 30 cm) - Use separator /screen to separate large size solid waste - Use Labor, floating pontoon ship and Tool or - Use Labor and tools in temporary disposal. For other location, Work by Excavator  Usually for this method for floating Garbage - Time for Construction are 2 kind of work 1. Construction that can be done for 24 hour Waduk Melati 1.1. Using existing Drain for temporary disposal

Handling Excavated material into Temporary Disposal Excavated Material

1.2. Using Container

Gunung Sahari Drain 1.3. Temporary Disposal

Dredging and Embankment of River

2. Construction that can be done only on 22.00 up to 05.00 local time Waduk Melati 2.1. Using existing Drain for temporary disposal Hauling and dumping into Disposal

2.2. Using Container Hauling and dumping into Disposal

Gunung Sahari Drain 2.3. Temporary Disposal Hauling and dumping into Disposal

2.4.

Directly from Pontoon Barge (assumption top of sediment that contain of garbage already excavated on day time and separation on temporary disposal) Hauling and dumping into Disposal

Dredging and Embankment of River

CONTRUCTION PLAN FOR FINAL DISPOSAL - Handling and hauling of material excavated and garbage at midnight from 22.00 wib up to 05.00 wib. -

Access to the Site can generally be achieved by the network of public roads and streets in the vicinity of Site.

-

The Contractor will use the existing road for the works. Design Route for Hauling and Handling into CDF Routes for Dredged Material ;  Jl. Kebon Kacang  Jl. MH. Thamrin  Jl. Merdeka Barat  Jl. Majapahit  Jl. Juanda  Jl. Ciliwung Gunung Sahari

-

The Contractor will be fully inform himself of the conditions of roads, traffic conditions and traffic regulations with respect to gaining access to the Site for the purposes of performing the Works and shall take all necessary actions to ensure availability of access to the Site as required.

-

The dredged materials shall be properly disposed in the designated Confined Disposal Facility (CDF) at Ancol without retribution cost.

-

The garbage to Bantargebang, the bidder must include the retribution cost and follow the cost regulation of Bantargebang. They can find out the cost per ton or per truck by themselves to Bantargebang.

-

During Handling and Hauling dredged Material into Confined Disposal Facility (CDF) at Ancol Area, contractor will be prepare of Water tank truck for cleaning of existing road routes from fall dredged material during transported

-

For Garbage, Disposal as determined to the tender document or otherwise determined by Director  Bantar Gebang

-

All truck / vehicles transporting the dredged material will be equipped with Global Positioning System as instructed, for monitoring purpose. All Truck will be Recording.

-

Daily report that mention ;  Type of truck  License plate number  Time of truck depature from the loading location  Time arrival at the deposit area in CDF Ancol

Dredging and Embankment of River

HAULING OF DREDGED SEDIMENT TO CDF - Handling and hauling of material excavated and garbage at midnight from 22.00 wib up to 05.00 wib. -

Access to the Site can generally be achieved via the network of public roads and streets in the vicinity of Site.

-

The Contractor will use the existing road for the works.

-

The Contractor shall fully inform himself of the conditions of roads, traffic conditions and traffic regulations with respect to gaining access to the Site for the purposes of performing the Works and shall take all necessary actions to ensure availability of access to the Site as required.

- Dredged Material will be transported into disposal, Spreader and grading. Handling Material, Truck’s

Dump must be equipped by Water Seal during transportation process, so that no debris of Excavated material on access road.

-

Traffic management with traffic lights that have been there (intersection lights) and will be assisted with traffic management by contractor

-

Contractor will request and permissions using Ancol’s land to using access road for disposal of excavated material  determined to the tender document  Confined Disposal Facility (CDF) at Ancol Area

-

Measurement and Payment Payment for dredging and disposal (garbage excluded) will be made at the negotiated and approved Contract unit price per m3 defined in the Bill of Quantities, multiplied by the total m3 of verified and weighted volume (say 35% of the dumped volume plus 65% of the dredged volume, ratio subject to change). No payment shall become due to the Contractor for over dredging or excess dredging which exceeds the allowable over depth.

-

For Garbage, Disposal as determined to the tender document or otherwise determined by Director  Bantar Gebang

-

All truck / vehicles transporting the dredged material will be equipped with Global Positioning System as instructed, for monitoring purpose. All Truck will be Recording.

-

Daily report that mention ;  Type of truck  License plate number  Time of truck depature from the loading location  Time arrival at the deposit area in CDF Ancol

Dredging and Embankment of River

GARBAGE SEPARATION / REMOVAL/DISPOSAL Separation; - Use separator /screen to separate large size solid waste - Use Labor, floating pontoon ship and Tool or - Use Labor and tools in temporary disposal. For some location, Work by Excavator  Usually for this method for floating Garbage

Temporary Disposal for Garbage

Temporary Disposal for Dredge Material

Disposal - The garbage to Bantargebang, the bidder must include the retribution cost and follow the cost regulation of Bantargebang. They can find out the cost per ton or per truck by themselves to Bantargebang.

- Garbage Material will be transported into disposal (bantargebang). Handling Material, Truck’s Dump

must be equipped by Water Seal during transportation process, so that no debris of Garbage on access road.

Dredging and Embankment of River

EMBANKMENT WORKS / CONSTRUCTION METHOD FOR CCSP On Waduk Melati

On Gunung Sahari

@ 14 m

@ 15 m

Description; - Structure Type W 450 B1000 (@ 15m and 14 m) - Work of CCSP is conecction with Revetment work  Finished of CCSP will continue with Revetment Work - Construction; 1. Location;  Construction on 2 Site , Waduk Melati and Gunung Sahari  Waduk melati 

= @ 15 m

 Gunung Sahari = @ 14 m

2. Other  Based of The drawing on Gunung Sahari Site, Work site divide to 2 side of River. West River (left side) and East River (Right side).  Contractor will construction this work by some Group of Works  Frontal on Waduk Melati and Gunung Sahari

Dredging and Embankment of River

CONSTRUCTION OF SHEET PILE (ALL LOCATION ON WADUK MELATI / MELATI BASIN) Refer to Tender Document, Work Stage / Construction Plan will be Constructed as bellowing Drawing 1. Temporary Stock Pile for Sheet Pile

Temporary Stock Pile

-

Based the Work Location, Stock Pile Possible Placed on Side of East of Waduk Melati Start Point for Handling Material and Equipment From Upper location as describe at Image bellowed. From Starting Point, The material will be to site by Pontoon and service Crane Any damage to existing structure or facilities that is caused by Contractor’s operational, contractor will be repaired to th pre-project contition at the contractor’s expense (even more better) Handling the material at mind night from 22.00 wib up to 05.00 wib

Point for Mob. & Handling Material etc

Plan of Stock Pile Plan of Stock Pile

Dredging and Embankment of River

Delivery and handling The Material

Temporary Stock Pile

Dredging and Embankment of River

2. Stage Construction Pilling

Temporary Stock Pile

CUT TOP PILE ( with leveling as according to the drawing)

LEAN CONCRETE

Dredging and Embankment of River

REINFORCING STEEL

FORM WORK (BY MULTIPLEX AND WOOD)

Concreting - Concreting by Ready mix - Compaction by Concrete Vibratory - Concreting by Truck mixer on Ponton

Dredging and Embankment of River

CONCRETING Concreting of West Side of Waduk melati Directly from Truck Mixer via Gutter

Concreting Side of melati

Dredging and Embankment of River

of East Waduk

FINISH

-

Removal Form work Installation on next location (side of existing capping beam)

Detail of Capping Beam Capping Beam - Reinforcing Steel - Form Work

-

Dredging and Embankment of River

Concreting as according to the drawing and technical specification

Finish

Detail Construction Of CCSP Work Assumption: 1. Work by Heavy Equipment (Machinery) 2. Location :As according to the drawing 3. Material CCSP (type as according to the drawing) Description 1. Site Work Preparation - Work site made with good level that a Crane can stand up goodly - Crane stand up above plate of form which in the form of steel plate 1,5 x 6 meter or On pontoon in position that Piling should be on water 2. Stake point of Pilling - Stake point of pilling of Concrete Corrugated Sheet Pile is executed by surveyor which is approved / agreed by Consultant Supervisor 3. Fabrication of Material sheet pile - Fabrication / manufacturing of Concrete sheet pile is formed after the drawing has been approved by Consultant supervisor. - Delivery to work site 4. Pilling - Excavation by labor to get form of pilling -

Made of guide beam on pilling position using steel material WF type with elevation distance from sub grade 1 to 2 meter, before pilling is executed

-

Guide beam is made with strength enough that can supporting of moment when pilling is executed and stabile

-

Piling founded by vertical and monitored with measuring instrument ( Theodolite) and yarn in 2 direction which each other vertical

-

Before pilling, pile with Vibro hammer have to in position of sentries

-

Concrete Sheet pile is vibrated by Vibro hammer is and the Sheet pile will be pilled into ground cause of gravitation moment and weight of Sheet pile it selfand also helped by Water Jet Pump that spraying water, that mean this construction to easyly andalso helped byWaterJetPump thatspraying waterwhichis intendedtosoften of soileasierPilling proccess

-

Vibratory is executed as sequence.

-

At pilling time, between one of Steel Sheet pile and each other of side (has been pilled) if there is gap, can be near by trek beam.

Dredging and Embankment of River

-

Pilling is executed until a Sheet pile reach deepness elevation plan as according to the drawing. Pengadaan dan Transportasi Material Sheet Pile

Dredging and Embankment of River

Type, capacity, Labor and Material Description

: Driving of Corrugated Pre-stressed concrete pile W 450

1) Labour

3) Production /

-

Foreman

=

-

Skill Labor

=

-

Labor

=

1 3

2) Material -

hour /day 4)

Item no

m

8

=

7.00

m

/hour

Equipments -

Crane On track 25 ton

=

2 Unit

=

56

m

/day

-

Vibro Hammer

=

2 Unit

-

Generator Set 50-70 KVA =

2 Unit

-

Pontoon

=

2 Unit

-

tools

=

1 Ls

Concrete Corrugated Sheet Pile

Schedule

= As according to " Construction Schedule" that one of attacments in Tender Bid Document

Dredging and Embankment of River

342

FLOW CHART OF CCSP Finished Earth Work No Ok

START

Order & Manufacture By Supplier / Sub Contractor

Equipment Mobilization (Crane with Vibro Hammer)

No Check Yes Delivery of Sheet Material on Trailer

Transportation of Sheet Pile

setting out Of location Pilling

Guide Beam Installation

Placed Sheet Pile on Work Site / stock area

Pilling Process pemancangan

Installation of Sheet Pile on Vibro Hammer (Pilling equipment)

Pilling

No Check Yes Finished Pillingi / Piled Sheet Pile

FINISH

Dredging and Embankment of River

Capping Beam

WADUK MELATI PUMP - Special Construction; This Waduk melati Pump, for outlet of pump should be cross of Train Rail existing -

Construction Plan Contruction Method for this Point will be used JACKING SLURRY (FULL JACK) method

Umumnya pemasangan pipa jacking diaplikasikan pada kondisi-kondisi lapangan seperti : - Melintang dibawah jalan raya yang padat (jalan tol, jalan kolektor, dll) - Melintang dibawah jalan rel K.A. - Saluran dibawah sungai (Syphon) - Pipa dengan installasi yang sangat dalam (lebih dari 5m) Pelaksanaan Pekerjaan Jacking Pipa 1. Pembuatan Driving / Receiving Pit /

SKALA : TANPA SKALA

DETAIL KONSTRUSI PENDUKUNG GALIAN DENGAN TEROWONGAN TANPA SKALA

SISTIM PENURAPAN UNTUK TANAH LABIL TANPA SKALA

UNTUK SEMUA PENYOKONG

I

TANPA SKALA

Adalah pekerjaan galian tempat untuk peralatan dan mesin jacking guna mendorong pipa secara horizontal, konstruksi starting/driving pit berukuran; Perkuatan dinding pit menggunakan Material sesuai dengan gambar diatas Disamping itu di dalam driving pit juga dilengkapi dengan block beton untuk dead man, pondasi mesin, lantai kerja. 2. Pekerjaan Boring & Jacking Pekerjaan pengeboran tanah dapat dilakukan dengan mesin, akan tetapi memungkinkan juga dilakukan secara manual apabila diameter pipa cukup besar untuk akses pekerja galian dan kondisi tanah cukup stabil.

Dredging and Embankment of River

Urutan pelaksanaan pekerjaan jacking 2.1. Persiapan Starting Pit & Ariving Pit Starting/Driving Pit adalah titik dimana Peralatan Mesin dipasang guna mendorong pipa selama pekerjaan jacking dilakukan. Sedangkan titik tujuan dinamakan Arriving Pit/Receiving Pit, yang digunakan untuk mengangkat kembali mata bor & pilot tube. Secara berturutan dan bila dimungkinkan Arriving Pit akan menjadi Starting pit untuk pekerjaan jacking section berikutnya.

Struktu Perkuatan Dinding Tanah

Deadman/ Concrete Trust Wall

Pondasi

ARRIVING PIT

STARTING PIT

RECEIVING PIT Pekerjaan persiapan ini antara lain adalah : pembuatan perkuatan dinding DRIVING galian,PITpembuatan deadman untuk menahan thrusting block, pembuatan lantai pondasi untuk guide-rail

7.00

Concrete Thrust Wall

Pressure plate

Concrete Pipe

Main Jack

1.40

Cutter Edge

Dudukan/Pengarah Jacking Pipe

2.40

Thrust Ring

6.00

Dredging and Embankment of River

Steel Sleeper

Arah Jacking

2.2. Installasi Mesin Jacking Setelah pekerjaan Starting Pit & Arriving selesai, mesin jackin mulai dipasang, Tipe Mesin Jacking yang dipilih perlu disesuaikan dengan ukuran diameter pipa, dan kapasitasnya disesuaikan dengan gaya dorong yang diperlukan. Pada umumnya peralatan mesin jacking terdiri dari: trusting block / hydraulick jack, guide rails, steel pressure plate, power pack, steel trusting ring, jacking shield / pilot tube, conveyor belt / slurry hose, dan control panel untuk operator mesin. Control Panel Power Pack

STARTING PIT Hydraulic Jack Laser Steel Thrust Ring Guide Rails

Steel Pressure Plate

2.3. Pemasangan Pilot Tube / Jacking Shield Pilot Tube / Jacking Shield adalah berupa silinder baja yang dipasang pada ujung pipa jacking dimana Mata bor terpasang.

Mata Bor **) Pilot Tube STARTING PIT

**) untuk ekskavasi tanah dengan cara manual biasanya mata bor diganti dengan driving collar (steel collar yang didesain khusus untuk menembus tanah). ARRIVING PIT

Dredging and Embankment of River

2.4. Pekerjaan pemboran dan jacking awal Setelah pilot tube dan mata bor terpasang, maka pekerjaan pemboran tanah dimulai dan setelah pilot tube masuk kedalam tanah, maka pipa pertama dipasang, kemudian pemboran dilakukan secara menerus sementara pipa didorong perlahan

Pipa -1

2.5. Pekerjaan pengangkutan tanah Steel Collar Selanjutnya untuk pipa ke-2, ke-3 dan selanjutnya sampai menuju ke arriving pit. Pekerjaan pengeboran berturutan / bersamaan. ARRIVING PIT dan pekerjaan mendorong pipa dilakukan secara STARTING PIT Pembuangan tanah hasil dari pemboran dibuang melalui conveyor, untuk type mesin lainnya biasanya untuk diameter kecil, tanah hasil pengeboran dicampur dengan air sehingga berbentuk slurry dan dibuang melalui pipa pembuangan. Pembuangan tanah untuk cara manual dapat digunakan trolley. Kecepatan pemasangan pipa jacking tergantung pada diameter pipa dan kondisi tanahnya, umumnya 1 s/d 6 pipa per hari (8 jam kerja).

ARRIVING PIT

Dredging and Embankment of River

STARTING PIT

2.6. Pekerjaan Jacking tahap akhir Setelah pipa jacking pertama sampai ke arriving pit, maka pilot tube dan mata bor di angkat, dan mesin jacking dipindahkan ke section berikutnya.

ARRIVING PIT

STARTING PIT

Stage Construction

4

3 1

2

2

Dredging and Embankment of River

1