topik 4 lesson learned - malaysian public works...

LESSON LEARNED

Ir. Mohd Firdaus bin MohdJurutera AwamBahagian Perkhidmatan Forensik StrukturCawangan Kejuruteraan Awam & StrukturIbu Pejabat JKR Malaysia

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

RUNTUHAN BUMBUNG STADIUM

Runtuhan bumbung Stadium SultanMizan, Terengganu pada 2008

Runtuhan perancah semasa kerjapembaikan di stadium yang samapada 20 Februari 2013.

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

RUNTUHAN SILING PEJABAT

Kejadian pertama runtuhan silingbumbung di Blok A, Ibu PejabatSPRM Melaka pada Ogos 2013.

Kejadian kedua runtuhan siling bumbungpada lokasi yang sama di Blok A, Ibu PejabatSPRM Melaka pada September 2015.

Kejadian ketiga runtuhan silingbumbung pada lokasi yang sama di Blok A, Ibu Pejabat SPRM Melaka pada Ogos 2016.

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Runtuhan gable-end wall DewanSerbaguna Kolej Tunku Kurshiah,Bandar Enstek, Negeri Sembilan pada16 Oktober 2014

Runtuhan merosakkan kedai koperasi &bilik yang menyimpan peralatan muzik.Kerugian dianggarkan lebih RM1.4 juta.

RUNTUHAN DINDING DEWAN

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RUNTUHAN BUMBUNG KAFETERIA

Runtuhan bumbung di Kafeteria IbuPejabat Bomba & PenyelamatMalaysia, Negeri Kelantan pada 21Oktober 2015

Sisa runtuhan kekuda cold-formed,penutup bumbung (concrete tiles) dansiling (fixed ceiling).

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Runtuhan kekuda bumbung VelodromeNasional Malaysia, Nilai ketikapembinaan pada 18 Jun 2016

Kekuda bumbung menghempap krenmudah alih yang berada di ruang dalamvelodrome.

RUNTUHAN KEKUDA VELODROME

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Penutup & kerangka bumbungMahkamah Pasir Mas tercabut akibattiupan angin pada 22 Ogos 2016

Serpihan penutup bumbung (metal deck)di kawasan parkir Hakim / PegawaiMahkamah

RUNTUHAN BUMBUNG MAHKAMAH

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RUNTUHAN SILING KLINIK

FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

Runtuhan siling di Kaunter KaunselingPemakanan, Klinik KesihatanMahmoodiah, Johor Bahru pada 06September 2017

Gantungan siling plaster pada mainrunner siling gantung sedia ada

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

Keretakan lentur & ricih pada hampirkeseluruhan rasuk di Blok A3, SekolahKebangsaan Tagasan, Semporna,Sabah

Keretakan ricih pada rasuk di DewanTerbuka sekolah

KEGAGALAN STRUKTUR SEKOLAH

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KEGAGALAN STRUKTUR SEKOLAH

Regangan pada dinding & rasuk bumbungBlok Tadika, Sekolah Kebangsaan SeriMaamor, Batu Pahat, Johor

Kegagalan rasuk konkrit bumbung

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Kualiti bahandiragui

Tidak mematuhilukisan pembinaan

ISU YANG BOLEH

DIELAKKAN

Kelemahankawalan kualiti

pembinaan

Kekeliruanperincian /

lukisan

KECACATAN / KEGAGALAN / KERUNTUHAN

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KAJIAN KES Keruntuhan Kekuda Bumbung Ketika PembinaanVelodrome Nasional Malaysia

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Kejadian berlaku pada 18 Jun 2016 (Jam lebih kurang 3.00 petang)

Keseluruhan sembilan (9) kekuda keluli bumbung runtuh setelah pemasangan

Runtuhan merosakkan struktur konkrit (in-situ & pra-tuang) dan beberapa kren mudah alih

Panjang rentang kekuda: 88.0 m

Tinggi kekuda: 1.70 m hingga 4.0 m

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1. MAIN TRUSS

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End Truss

* MT : Main Truss

MT1 : TRUSS T2

MT2 MT5- : TRUSS T3

MT6 : TRUSS 3A

MT7 MT9- : TRUSS T3

Keadaan 9 kekuda utama yang runtuh di tapak

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

MT2

MT1

MT3

MT4

MT5

MT6

MT7

MT8

MT9

Kedudukan 9 kekuda utama yang runtuh seperti dalam Lukisan Pembinaan

MT1

0

MT1

1

MT1

2

MT1

3

MT1

4

MT1

5

End

Trus

s

End

Trus

s

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Keratan tipikal jenis kekuda utama (Truss T2)

Keratan tipikal jenis kekuda utama (Truss T3)

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Keratan tipikal jenis kekuda utama (Truss T3A)

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2. FRAME TRUSS&

BRACING TRUSS

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MT2

MT1

MT3

MT4

MT5

MT6

MT7

MT8

MT9

Section B-B

Section C-C

Section A-A

Kedudukan frame truss & bracing truss seperti dalam Lukisan Pembinaan

MT1

0

MT1

1

MT1

2

MT1

3

MT1

4

MT1

5

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Frame Truss (TT1, TT2)

MT6

MT7

MT8

MT9

MT1

0

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Frame Truss (TT2)

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Bracing Truss (T4)

MT6

MT7

MT8

MT9

MT1

0

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3. PRECAST CONCRETE COLUMN

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Selepas runtuhan:

Kedudukan 10 tiang konkrit pra-tuangtermasuk Tiang C9 yang tumbang. Terdapat perubahan rekabentuk padakesemua tiang tersebut (enlargement)

Sebelum runtuhan:

Keadaan Tiang C9 sebelumruntuhan

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

MT2

MT1

MT3

MT4

MT5

MT6

MT7

MT8

MT9

Kedudukan 9 kekuda utama yang runtuh seperti dalam Lukisan Pembinaan

MT1

0

MT1

1

MT1

2

MT1

3

MT1

4

MT1

5

End

Trus

s

End

Trus

s

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PUNCA UTAMA RUNTUHAN

FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

1. Sequential Erection Procedure Yang Tidak Dipatuhi

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LIFTING &

RIGGING???

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MT2

MT1

MT3

MT4

MT5

MT6

MT7

MT8

MT9

Kedudukan 9 kekuda utama yang runtuh seperti dalam Lukisan Pembinaan

MT1

0

MT1

1

MT1

2

MT1

3

MT1

4

MT1

5

End

Trus

s

End

Trus

s

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ERECTION SEQUENCES

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PC Column

ERECTION SEQUENCES

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

PC Beam

ERECTION SEQUENCES

PC Column

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PC BeamPC Column Frame Truss(TT1 & TT2)

ERECTION SEQUENCES

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

PC BeamPC Column

ERECTION SEQUENCES

Frame Truss(TT1 & TT2)

Bracing Truss(T4)

Missed

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

PC BeamPC Column Main Truss(T3 & T3A)

ERECTION SEQUENCES

MT6

MT7

MT8

MT9

MT1

0

Frame Truss(TT1 & TT2)

Bracing Truss(T4)

Missed

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Tiada Bracing Truss T4 yang dipasang

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Tiada Bracing Truss T4 yang dipasang

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MAIN CONTRACTOR

DESIGN ENGINEER

ERECTION ENGINEER

FABRICATOR

???

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PUNCA UTAMA RUNTUHAN

1. Sequential Erection Procedure Yang Tidak Dipatuhi

FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

2. Temporary Props

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Temp Props

Hanya empat (4) temporary props yang disediakan semasa pemasangan kekuda

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PUNCA UTAMA RUNTUHAN

1. Sequential Erection Procedure Yang Tidak Dipatuhi

FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

2. Temporary Props

3. Kelemahan Pengawasan & Kawalan Kualiti Kerja

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ERECTION SEQUENCES

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

Top Chord

Top Chord

Bottom Chord

Bottom Chord

Frame Truss TT1Column C9

Embedded length bagi anchor bolts adalah berbeza-beza – meragukan Bahan grouting / adhesive tidak memuaskan (bukan shear @ pull-out tetapi slippage failure)

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Pratuang

In-situ

Kaedah column enlargement meragukan – kegagalan ikatan antara pc column dengan in-situ column (clean surface)

In-situ

PC

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FORENSIK STRUKTUR / JABATAN KERJA RAYA MALAYSIA

WHEN YOU REPEAT A MISTAKE, IT IS NOT A MISTAKE ANYMORE

“ IT IS A DECISION “

- Paulo Coelho-

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TERIMA KASIH

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