Pipa listrik CPVC dan skema konstruksi perlindungan kabel: lingkungan suhu tinggi dan perawatan penyegelan

2025-08-18


CPVC pipa listrik adalah bahan penting untuk perlindungan kabel di lingkungan suhu tinggi, dan kualitas konstruksinya berhubungan langsung dengan pengoperasian sistem tenaga yang aman dan stabil. Dikombinasikan dengan praktik teknik, makalah ini menguraikan teknologi utama konstruksi pipa listrik CPVC di lingkungan suhu tinggi dari tiga dimensi pretreatment material, proses pemasangan dan perlindungan penyegelan.

1. Poin kunci teknologi konstruksi di lingkungan suhu tinggi

1. Proses pretreatment material

CPVC perlu diuji untuk kinerja suhu tinggi sebelum memasuki lokasi untuk memastikan bahwa suhu pelunakan vicat adalah 93 ° C dan kekuatan tariknya adalah 60 MPa. Selama konstruksi musim panas, pipa harus disimpan di tempat yang sejuk dan berventilasi untuk menghindari sinar matahari langsung yang menyebabkan suhu badan pipa melebihi 40 ° C. Operasi pemotongan perlu dilakukan ketika suhu sekitar lebih rendah dari 35 ° C. Sayatan diperlakukan dengan perangkat chamfering khusus untuk memastikan bahwa sudut alur adalah 305 dan kekasaran permukaan adalah Ra6.3μm.

2. Penggalian alur dan perlakuan dasar

Di bawah lingkungan suhu tinggi, penggalian parit harus dibangun dalam beberapa bagian, panjang setiap bagian harus dikontrol dalam 50 meter, dan dukungan lereng harus diatur ketika ke dalaman penggalian melebihi 2 meter. Perlakuan dasar diisi ulang dengan pasir dan kerikil bertingkat, dengan tingkat pemadatan berlapis 93%, bantalan pasir kasar sedang setebal 200mm diletakkan, dan vibrator datar digunakan untuk bergetar erat. Kesalahan kerataan permukaan adalah 5mm / 2m.

3. Proses peletakan pipa

Sebelum peletakan, pipa harus dipanaskan terlebih dahulu untuk mengontrol suhu badan pipa pada 25-30 ° C. Saat memasang dengan metode traksi mekanis, gaya traksi harus 15kN, dan kecepatan traksi harus dipertahankan pada kecepatan konstan 0,8m / menit. Lapisan buffer elastis diatur pada antarmuka pipa, yang disegel dengan paking karet butil. Kesenjangan antarmuka dikendalikan pada 1.5-2 mm, dan penyimpangan sumbu adalah 10mm / 10m.

Kedua, rencana proyek khusus perawatan penyegelan

1. Proses penyegelan antarmuka soket

mengadopsi struktur penyegelan "cincin penyegel ganda + sealant elastis": cincin penyegel pertama terbuat dari karet EPDM, dengan kekerasan Pantai 705HA, dan jumlah kompresi dikendalikan pada 35% -40%; cincin penyegel kedua terbuat dari karet bengkak air, dengan rasio ekspansi 300%. Terapkan sealant tahan suhu tinggi secara merata di bagian dalam antarmuka, dan ketebalan lapisan karet 1.2-1. 5mm, dan waktu kering permukaan adalah 30 menit.

2.

Casing tahan air fleksibel dipasang pada sambungan antara kabel yang bekerja dengan baik dan pipa. Kesenjangan antara casing dan pipa diisi dengan busa poliuretan, dan kepadatannya adalah 60kg / m ³. Bagian luar dinding sumur dicat dengan lapisan tahan air poliurea setebal 2mm, dengan perpanjangan 300% dan adhesi 5MPa. Kepala sumur disegel dengan penutup lubang besi cor dan cincin penghenti air karet nitril built-in. Jumlah kompresi dikendalikan pada 25% 3%.

3. Tindakan penyegelan bagian khusus

Mengadopsi jaket pipa pelindung MPP untuk melintasi bagian jalan. Casing dan pipa CPVC diisi dengan wol batu tahan api, dengan kepadatan 120kg / m ³. Kedua ujungnya disegel dengan semen penyegel tahan api, dan laju pemuaian 250%. Platform bahu tahan air dipasang di area perbedaan tinggi dan rendah. Beton C25 dituangkan. Kemiringan dikendalikan pada 5-8. Permukaannya dicat dengan cat tahan air kristal permeabel. Ketebalan film kering adalah 1.0mm.

Ketiga, kontrol kualitas dan ukuran keselamatan

Titik kontrol kualitas harus ditetapkan setiap 200 meter selama proses konstruksi. Item pengujian meliputi: penyimpangan elevasi pipa 10mm, perpindahan sumbu 30mm / 100m, tekanan uji penyegelan antarmuka 0,6MPa, dan penahan tekanan selama 30 menit tanpa penurunan tekanan. Selama periode operasi suhu tinggi, 11: 00-15: 00 harus dihindari. Lokasi konstruksi dilengkapi dengan peralatan ventilasi paksa. Operasi luar ruangan dihentikan ketika suhu lingkungan melebihi 38 ° C.

Skema ini dapat secara efektif memecahkan masalah konstruksi pipa listrik CPVC di lingkungan suhu tinggi melalui pemilihan ilmiah material, teknologi konstruksi yang disempurnakan, dan sistem perlindungan penyegelan ganda. Setelah verifikasi teknik, sistem perlindungan kabel yang dibangun oleh skema ini dapat dijamin 50 tahun tanpa kebocoran di bawah 80 ℃ lingkungan. Ketahanan isolasi adalah 1000MΩ · km, yang memberikan jaminan yang andal untuk pengoperasian rekayasa daya yang aman di lingkungan yang ekstrem. Seluruh proses konstruksi harus secara ketat menerapkan standar yang relevan dari "Kode Desain Jalur Kabel Rekayasa Daya Listrik" GB50217 dan "Spesifikasi Teknis untuk Rekayasa Pipa Drainase Polietilen Terkubur" CJJ143.

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