beton prategang

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FLY OVER KUALANAMU MEDAN – SUMATRA

UTARA

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SCOPE OF WORKS

VSL’s scope of works are :

a. SUPPLY of MATERIALS AND EQUIPMENTS of PRESTRESSING WORKS (excluding strand)

b. INSTALLATION (excluding bursting steel, support bar)

c. STRESSING

d. GROUTING (excluding cement)

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STRAND

MATERIAL SPECIFICATION

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DUCT

Material ini berfungsi sebagai pembungkus strand, dengan bahan dasarnya adalah Galvanized Zinc yang dibentuk berupa pipa berulir :

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LIVE ANCHORAGE

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DEAD END ANCHORAGE

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ADDITIVE FOR GROUT

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EQUIPMENT SPECIFICATION

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GROUT PUMP

Technical Data :

Power : 5.5 HPMax. Pressure : 10 BarVoltage : 380 VoltCapacity : 8 BagDelivery : 40 Liter/min

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FLOW CHART

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SPESIFIKASIGAMBAR KERJA

MATERIAL PABRIKASI STRAND INSTALASI STRAND KALAU ADA, INSTAL LIFTING HOOK

PEMASANGAN ANGKUR HIDUP DAN ANGKURMATI

INSPEKSI BERSAMA KONTRAKTOR

PENGECORAN

KUAT BETON PADA SAAT TRANSFER

STRESSING

EVALUASI HASIL STRESSING

GROUTING

SELESAI

MENUNGGU KUAT BETON PADASAAT TRANSFER TERCAPAI

TIDAK

OK

TIDAK

TIDAK

ALUR KERJ A PEKERJ AANPRESTRESSING

FLOW CHART

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SPESIFIKASIGAMBAR KERJA

MATERIAL PABRIKASI STRAND INSTALASI STRAND KALAU ADA, INSTAL LIFTING HOOK

PEMASANGAN ANGKUR HIDUP DAN ANGKURMATI

INSPEKSI BERSAMA KONTRAKTOR

PENGECORAN

KUAT BETON PADA SAAT TRANSFER

STRESSING

EVALUASI HASIL STRESSING

GROUTING

SELESAI

MENUNGGU KUAT BETON PADASAAT TRANSFER TERCAPAI

TIDAK

OK

TIDAK

TIDAK

ALUR KERJ A PEKERJ AANPRESTRESSING

FLOW CHART

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SHOP DRAWING

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SHOP DRAWING

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INSTALLATION

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1.1. Pemasangan pembesian balok Pemasangan pembesian balok

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2. 2. Pengukuran ordinat tendon Pengukuran ordinat tendon

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3. 3. Pemasangan support bar pada posisi yang telah Pemasangan support bar pada posisi yang telah diberi marking.diberi marking.

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4.4. Penempatan duct pada setiap support bar.Penempatan duct pada setiap support bar.5.5. Menyambung duct dengan duct coupler.Menyambung duct dengan duct coupler.

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6. Memasang angkur hidup (Casting)6. Memasang angkur hidup (Casting)7. Memastikan semua ordinat tendon telah berada 7. Memastikan semua ordinat tendon telah berada pada posisinya.pada posisinya.

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8.8. Pemeriksaan bersama kontraktor dan Pemeriksaan bersama kontraktor dan konsultankonsultan

9.9. Perbaikan jika diperlukan.Perbaikan jika diperlukan.10. Pengecoran.10. Pengecoran.

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STRESSING

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CCOMPRESSIVE COMPRESSIVE CONCRETE STRENGTH !!ONCRETE STRENGTH !!

STRESSING

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stressing tendon dapat dilakukan

Jika

Kuat Tekan Test Beton mencapai minimum 80% dari kriteria design

Kecuali tersebut dalam spesifikasi

STRESSING

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STRESSING

GENERAL STRESSING THEORY

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1. Perhitungan Jacking force 1. Perhitungan Jacking force

2. Persiapan peralatan stressing2. Persiapan peralatan stressing

3. Memasang anchor head dan wedges3. Memasang anchor head dan wedges

4. Memasang chair block.4. Memasang chair block.

5. Memasang jack hingga rapat anchor block5. Memasang jack hingga rapat anchor block

6. Memberikan gaya awal sebesar 5 mpa. untuk 6. Memberikan gaya awal sebesar 5 mpa. untuk merapatkan segmenmerapatkan segmen

7. Pencatatan gaya pada manometer dan elongasi7. Pencatatan gaya pada manometer dan elongasi

8. Persetujuan hasil stressing 8. Persetujuan hasil stressing

9. Menutup anchor head dengan mortar semen 9. Menutup anchor head dengan mortar semen (parging)(parging)

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Persiapan stressing bed

Pemasangan anchor block dan wedges

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Instalasi Hydraulic jackPenyetelan gripper plate dan

pemasangan T device

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Pemasangan busa pelindung duct dan pemberian epoxy pada sambungan segmen

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Pelaksanaan stressing

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Pengukuran elongation

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STRESSING PROCEDURE (MULTISTRAND)

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METODA STRESSING SECARA UMUM :

1. ONE ENDArti : Stressing 1 unit tendon dilakukan pada 1 arah dengan

menggunakan 1 alat

2. BOTH ENDArti : Stressing 1 unit tendon dilakukan pada 2 arah secara

bersamaan dengan menggunakan 2 alat

3. TOP UPArti : Stressing 1 unit tendon dilakukan pada 2 arah secara

bergantian dengan menggunakan 1 atau 2 alat

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TAHAPAN STRESSING :

1. Stage I : up to 25% of Final Jacking Force

2. Stage II : up to 50% of Final Jacking Force

3. Stage III : up to 75% of Final Jacking Force

4. Stage IV : up to 100% of Final Jacking Force

5. Stage V : Release force down to 5% of Final Jacking Force

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WHEN EVERYTHING IS READY, STRESSING MAY BEGIN

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STRESSED TENDON AT ONE END ONLY (passive side is live end)

END AEND A

LL

STRESSED TENDON AT ONE END ONLY

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STRESSING TENDON UP TO 25% OF FINAL JACKING FORCE

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MEASURED ELONGATION AND CEK WEDGE DRAW IN AT PASSIVE SIDE (IF ANY)

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1.) RECORD ELONGATION READING AT 25% OF FINAL JACKING FORCE

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RELEASE PRESSURE TO ZERO AND RETRACT PISTON

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PULL JACK BACKWARD SLIGHTLY AND SPRAY MARK AT BUNDLE STRAND WHERE ARE FACING ON ANCHOR HEAD

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PUSH JACK TOWARD ANCHOR HEAD

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STRESSING TENDON UP TO 50% OF FINAL JACKING FORCE, MEASURED ELONGATION.RECORD ELONGATION READING AT 50% OF FINAL JACKING FORCE.(calculated the elongation between 25% and 50% by deducting 25% value from 50% value and record that value)

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STRESSING TENDON UP TO 75% OF FINAL JACKING FORCE, MEASURED ELONGATION.RECORD ELONGATION READING AT 75% OF FINAL JACKING FORCE.(calculated the elongation between 50% and 75% by deducting 50% value from 75% value and record that value)

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STRESSING TENDON UP TO 100% OF FINAL JACKING FORCE, MEASURED ELONGATION.RECORD ELONGATION READING AT 100% OF FINAL JACKING FORCE.(calculated the elongation between 75% and 100% by deducting 75% value from 100% value and record that value)

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RELEASE FORCE DOWN TO 5% OF FINAL JACKING FORCE , MEASURED ELONGATION.RECORD READING ELONGATION AT 5% OF FINAL JACKING FORCE.

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CALCULATION ELONGATION

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Value of “adjustment jack (mm)” are based on the jack will be used during stressing.

Formula for Adjustment Jack = P L / n E A

Example :Type jack : ZPE 460L jack : 58 cmP jacking (100% JF) : 4028 KN = (4028 x 1000)/9.81 = 410601.427 kg n strand : 19 (0.6’)A strand : 1.5 cm2E strand : 1.95 x 106 kg/cm2

Adjustment Jack = (410601.427 x 58) / (19 x 1950000 x 1.5)= 0.42 cm = 4 mm

Value of “adjustment draw in a (mm)” and “adjustment draw in b (mm)” are based on VSL system, where ; a : draw in wedges at active side = 6 mm b : draw in wedges at passive side = 2 mm

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Elongation

calculated before

lock-off

Elongation

calculated after

lock-off

0mm -6mm Wedge seating in stressing end

-4mm -4mm Elongation in jack

-2mm -2mm Wedge seating in dead end

+6mm 0 Wedge seating in stressing end

0 0 Elongation in jack

-2mm -2mm Wedge seating in dead end

Engineer

Elongation measured

before lock-off

Elongation measured

after lock-off

Multi

Single

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Tujuan Grouting :

Mencegah korosi didalam Tendon

Sebagai kekuatan ikatan antara Tendon dan Beton

GROUTING

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Pemilihan materials semen, air, additive yang sesuai dengan spesifikasi

Kontrol terus menerus untuk memastikan hasil dan campurannya sesuai.

Pelaksanaan Grouting dilaksanakan oleh orang yang sudah berkompeten

Kualitas dari Grouting dapat dicapai dengan :

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Komposisi material penyusun grout :

Semen : 1 bag (50 kg)

Air : 0,40 – 0,45 dari berat semen

20 – 22,5 liter / sak semen

Admixture : 0.45 % dari berat semen

200 – 225 gram / sak semen

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Compressive Strength test

a. Test dilakukan pada sample kubus Grouting

b. Alat yang digunakan :

o Metal moulds 50 mm x 50 mm x 50 mm

o Compressive test machine

o Glass plate

o Steel ruler

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c. Prosedur :

o Pour fresh grout into the mould. The sample shall not be subject to any vibration. Immediately strike off the excess grout with steel ruler slowly in each direction. Then cover the sample with a glass plate. Give mark on mould to identify the sample.

o Sample harus direndam didalam air pada suhu ± 20 derajat celcius sampai saat akan dilakukan test.

o Compressive strength test dilakukan minimal pada 2 benda uji untuk satu Grouting mixing.

• Reporting : Catat hasil pengujian compressive strength untuk masing – masing

sample (N/mm2)

• Kriteria : strength ≥ 30 N/mm2 at 28 days strength ≥ 27 N/mm2 at 7 days

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Thank for your attention

VSL INDONESIAVSL INDONESIAPhone: (62) 21 570 0786Phone: (62) 21 570 0786

Fax: (62) 21 573 1217 / (62) 21 573 7557Fax: (62) 21 573 1217 / (62) 21 573 7557E-mail: vslin@vslin.comE-mail: vslin@vslin.com