9/30/2014. Kaedah Pengukuran/ Perolehan Data untuk Pemetaan Utiliti. Bagaimana Data Utiliti Diperoleh. Peralatan Pengesanan dan Penentududukan

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1 Peralatan Pengesanan dan Penentududukan Kaedah Pengukuran/ Perolehan Data untuk Pemetaan Utiliti PCL GPR Total Station GNSS 2 Mengapa pepasangan utiliti bawah tanah perlu dikesan? Bagi mengelakkan kemalangan yang melibatkan nyawa dan kemusnahan aset utiliti sedia ada. Bagi mengelakkan pertambahan kos semasa kerja-kerja pengorekkan jalan. Sebagai maklumat awalan sebelum kerja-kerja pengorekkan Bagi memenuhi kewajiban pihak kontraktor. Maklumat-maklumat yang diperlukan sebelum kerja-kerja pengorekkan dilaksanakan 1. Apakah maklumat utiliti yang tertanam di kawasan itu? (jenis, pemilik, material bahan, saiz dll) 2. Dimanakah kedudukan pepasangan utiliti tersebut? (alignment, direction) 3. Berapakah kedalaman pepasangan utiliti tersebut? (kedalaman utiliti ditanam) Persediaan yang perlu sebelum memulakan kerja-kerja pengesanan utiliti 1. Dapatkan peta atau pelan utiliti bagi kawasan tersebut (maklumat awalan) 2. Perhatikan keadaan tempat semasa (keadaan tanah (basah/kering), pili bomba, gas valve dll) 3. Menilai keberkesanan pelbagai teknik pengesanan bagi mengesan pepasangan utiliti. JANGAN bergantung kepada satu teknik pengesanan sahaja. Bagaimana Data Utiliti Diperoleh Pengesanan Untuk pepasangan (installation) sudah ditanam Ukuran Terus Untuk pepasangan baru yang belum ditanam 6 1

2 Bagaimana Data Utiliti Diperoleh Pengesanan Untuk pepasangan (installation) sudah ditanam Ukuran Terus Untuk pepasangan baru yang belum ditanam Teknik Perolehan Geofizik Secara Pengesanan Untuk pepasangan (installation) sudah ditanam Libatkan pengesanan utiliti di bawah tanah secara non-invasive Menggunakan kaedah pengesanan geofizikal e.g PCL dan GPR Libatkan pengukuran tanda di permukaan diukur menggunakan peralatan ukur konvensional atau GNSS Hasil ukuran tahap Kualiti B 7 8 Peralatan utama yang digunapakai bagi mengesan pepasangan utiliti bawah tanah: Electromagnetic Locater (Pipe and cable locater) Ground Penetrating Radar (GPR) Pengesanan Menggunakan Pipe and Cable Locator (PCL) Mengandungi 2 komponen utama Pemancar (transmitter) Penerima (receiver) Terdapat pelbagai jenis PCL dengan berbagai saiz dan bentuk serta frekuensi boleh diperoleh dipasaran. Julat frekuensi yang biasa digunakan : 50 Hz ke 480 khz PCL berupaya mengesan pada ketepatan ± 10cm dan kedalaman pada ±5% daripada nilai sebenar 10 Teknik pengesanan menggunakan prinsip radio detection Menggunakan prinsip elektomagnetic untuk mengesan utiliti bawah tanah. Arus elektrik yang mengalir pada bahan konduktor mengeluarkan medan magnet bulat di keliling konduktor. Koil penerima boleh digunakan untuk mengesan amplitud medan magnet Amplitud berubah bergantung kepada kedudukan dan arah penerima dalam medan magnet Amplitud paling tinggi apabila penerima berada tepat diatas bahan konduktor Digunakan untuk kesan bahan logam yang boleh mengeluarkan gelombang elektromagnet Prinsip Asas Operasi PCL Pemancar Medan magnet Penerima Pemancar keluarkan isyarat gelombang Isyarat gelombang jana medan magnetik Medan magnetik mengarahkan isyarat ke dalam penderia penerima 12 2

3 Pengendalian PCL Adakah pengukur tersebut sedang mengesan kabel? 14 Apakah yang sebenarnya dikesan?.yang sebenarnya dikesan adalah medan magnet (magnetic fields)? Apakah itu Medan Magnet? Terdapat 2 kaedah bagi mengesan medan magnet iaitu secara; 1. Peak and 2. Null Medan magnet adalah arus yang dipancarkan oleh konduktor yang membawa arus. 3

4 Peak Response Peak Response Null Response Null Response Null Response LOCATING 4

5 Locating Pipe or Cable Direction Pipe or Cable Direction 55 Marking 56 5

6 Frequency BAGAIMANA MEMILIH FREKUENSI YANG SESUAI? Frequency vs Range Frequency = Range (Capacitance Effect) Which Frequency? Which Frequency? Low frequency = long range (minimum capacitance signal loss to ground). This frequency is better for connection and locating longer metal pipes or cables. Radiodetection Higher frequency = shorter range (greater capacitive signal loss to ground). This frequency is better for induction onto small or short length conductors, such as telephone drops, CATV cables or street light cables. 6

7 Pipe = Surface Area = Range Pipe = Surface Area = Range Ground Moisture Low Frequency Better Identification Higher Frequency, Broader Peak High Frequency Signal Coupling Higher Frequency 7

8 APPLICATION Passive Active There are two methods of signal detection. Two types of Passive Signal 1. Radio Signal 2. Power signal Passive Signal - Radio 8

9 Passive Signal - Power 50/60Hz Passive Sweep Passive Active There are two methods of signal detection. DIRECT CONNECTION 29 9

10 Direct Connection Direct Connection Connection ma Direct Connection ma A successful connection to the metallic pipe or cable will be indicated by a change in the transmitter audio or visual indicator. Always make the best possible connection for reliable signal. Direct Connection Direct Connection 10

11 Signal Clamp SIGNAL CLAMP Signal Clamp Signal Clamp Signal Clamp Higher Frequency 11

12 INDUCTION 48 Induction Induction Induction Induction - Signal Strength 12

13 Induction - Identification Active Sweep Induction - Identification Induction - Never Locate Near To The Transmitter. Min 10 paces away from the transmitter. Check the signal with the receiver. 13

14 Induction : Re-Bar Interference General Locating During excavation, keep checking in the trench. This may show smaller conductors which were not detectable at ground level. Problems Solving GENERAL LOCATION Locate A Death End Pipe, But NOT Pot End Cable! Locate A Bend 14

15 Locate A Submerge Pipe or Cable. Locate A Tee. Locate Problem: Re-bar Connection Connection Remote ground = better range, less signal transfer. Badly positioned remote ground causes more signal transfer. Always place ground rod away from adjacent utilities. 15

16 Connection Ground stake too close to target conductor: Less range, some signal transfer. Metal fences may seem a convenient ground point, but might produce interfering signals. Always use an independent ground such as a screwdriver or ground stake. Connection LOCATOR LIMITATIONS Grounding to a structure which is also grounded can produce multiple signals. SIGNAL DISTORTION Distortion Distortion 1 3 Peak Null This distortion varies depending upon the direction and magnitude of the current flow, causing a discrepancy between the peak and null aerial responses. Current on one line may induce 'stray' signals to nearby conductors. 16

17 Distortion Unique Features For Cable Identification DEPTH MEASUREMENT CURRENTMEASUREMENT(CM) CURRENT DIRECTION(CD) Distorted field may appear to come from a different point. Depth Measurement HOW TO TAKE DEPTH MEASUREMENT? Depth Measurement Depth Measurement 17

18 Distortion and Depth Peak Null Depth Measurement d Peak Null d When there is a discrepancy between the aerial responses the following must be observed. 1. The Peak response will always be more accurate. 2. Push button depth estimation should not be used until the two responses agree. Depth Measurement Current Measurement(CM) Low Frequency Better Identification Signal Coupling: How to identify? 18

19 Current Measurement(CM) Current Measurement(CM) Current Measurement(CM) Current Measurement(CM) Current Measurement(CM) CURRENT DIRECTION(CD) 19

20 Current Direction (CD) Expected current direction indications and return signal path. Current Direction(CD) The target line is identifiable by Current Direction. Current Direction(CD) Current Direction(CD) Current Direction (CD) Penentuan lokasi Menggunakan Alat penerima Global Navigation Satellite System (GNSS) latest boleh menerima isyarat dari 3 system GNSS GPS, GLONASS dan Galileo untuk menentukan lokasi. Teknik pengesan utiliti tidak boleh position cuma detect kedudukan Pengesan akan tanda dengan tepat kedudukan utiliti dan kemudian di ukur menggunakan GPS dan total station Possible current direction indication on conductors. 20

21 Ground Penetrating Radar GPR can be defined as a radar which able to detect buried objects and to characterize the subsurface structure and properties in a wide variety of applications. Basic concept of GPR The GPR is a device used for non-invasive scanning and precise detection of underground utilities. GPR is composed of a receiver and transmitter antenna, a control unit, battery supply and a survey cart Basic concept of GPR Basic concept of GPR Generally, when the survey cart moves on the site surface the transmitting antenna send polarized, high frequency electromagnetic (EM) waves in the ground. Because of different existing inhomogenities in the ground, e.g. soil layers, underground utilities, stones, gravel, cavities and other anomalies, part of the EM waves is reflected from the dielectric boundary between different materials and other part is refracted and goes to the deeper layer GPR image Frequency selected Attenuation, α GPR Plateau General character of EM field phase velocity and attenuation with frequency illustrating the GPR plateau (Annan, 2002) Frequency (MHz) 21

22 Laluan GPR Laluan GPR Laluan GPR 9/30/2014 GPR Limitations The factors affecting the GPR performance and should be consider are the design of a GPR (hardware), target types, material of the target and the surrounding (environment) Teknik Pengesanan menggunakan Pengesanan Menggunakan Ground Penetratin/Probing Radar (GPR) Teknik radio detection tidak boleh digunakan untuk kesan bukan metalik termasuk paip air dan gas plastik, paip di perbuat dari tanahliat dan cable gentian. GPR berfungsi dengan menghantar microwave kedalam tanah dan proses pantulan balik dari pelbagai lapisan yang diterima oleh akan menghasilkan imej dalam bentuk hyperbola. Imej perlu dibuat interpretasi 128 Teknik Pengesanan menggunakan Pengesanan Menggunakan Ground Penetrating/Probing Radar (GPR) 129 Operasi Pengesanan Jarak Selang Pengesanan BM PCL GPR Mula GPR Henti GPR 1 (x 1, y 1) 4 (x 4, y 4) Mula 5 (x 5, y 5) Kabel (sedang dipasang) (x 11, y 11) (x 12, y 12) Laluan PCL B (x B, y B) Lubang Ujian Kesan setiap 20m Garis Rentas Garis lintang Arah pergerakan Lihat muka 11 garis panduan (x 10, y 10) 12 2 (x GPR 2, y 2) Henti 3 (x 3, y 3) GPR Mula 6 (x 6, y 6) GPR Henti A (x A, y A) Tanda Cat (GPR) Tanda Cat (PCL) Air Stesen Kawalan Elektrik Telekomunikasi

23 Pelbagai Jenis Antena GPR Bagaimana Data Utiliti Diperoleh Dari kiri ke kanan: Sistem Antenna GPR. 1,500, 900, 550, 400, 300, 200, 120, 100, 80 MHz Pengesanan Untuk pepasangan sudah ditanam Ukuran Terus Untuk pepasangan baru yang belum ditanam Kelas Antena Frekuensi Antena Kedalaman Pengesanan Frekuensi Tinggi > 1000 MHz < 0.5 m Frekuensi Sederhana Tinggi MHz 0.5 m 1.5 m Frekuensi Sederhana Rendah MHz 1.5 m 2.0 m Frekuensi Rendah < 200 MHz 2.0 m 3.0 m Kaedah Ukuran Terus Libatkan pengukuran kepada utiliti yang terdedah Menggunakan peralatan ukur konvensional Ukuran lubang ujian Ukuran terus sebelum pepasangan utiliti ditimbus Hasil ukuran data utiliti pada tahap Kualiti A Lubang ujian Backoe Penggalian menggunakan alat asas Ekskavasi hampagas 136 Peralatan Ukuran Terus Perbandingan Pengesanan & Pengukuran Terus Kaedah Kegunaan Tahap Kualiti Peralatan Pengesanan Pepasangan B PCL Tertanam GPR Total Station GNSS Pengukuran Pepasangan A Total Station Terus baru belum GNSS ditanam Masa Ketepatan Kos (relatif) Perolehan (relatif) Data (relatif) Rendah Tinggi Lama Tinggi Rendah Cepat Sesuai mulakan pemetaan utiliti secepat mungkin Penggunaan kaedah pengukuran terus terbaik bagi pepasangan baru Penggunaan kaedah pengesanan kaedah terbaik untuk pepasangan sedia ada

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