Skim pembinaan paip kuasa PE yang tertimbus terus di luar rumah: anti-karat dan perlindungan kerosakan mekanikal.

2025-08-18


PE Paip kuasa digunakan secara meluas dalam projek pengebumian langsung saluran paip kuasa luar kerana kelebihan rintangan kakisan, ringan dan kemudahan pembinaan. Walau bagaimanapun, kakisan tanah, kesan beban luaran dan faktor lain dalam persekitaran pengebumian langsung terdedah kepada kerosakan saluran paip, dan perlindungan jangka panjang perlu dicapai melalui penyelesaian pembinaan saintifik. Perkara teknikal utama dihuraikan di bawah dari segi penyediaan pembinaan, reka bentuk anti-karat, perlindungan mekanikal dan kawalan kualiti.

1. Penilaian alam sekitar sebelum pembinaan dan penyediaan bahan

. Tahap kakisan perlu ditentukan melalui pengukuran pH, ujian kerintangan dan analisis komposisi tanah. Untuk tanah yang sangat menghakis (pH9.0), langkah anti-karat yang dipertingkatkan diperlukan. Pada masa yang sama, semak kualiti paip PE untuk memastikan ia mematuhi piawaian GB / T 13663.2, dan fokus pada pengesahan sisihan ketebalan dinding, kekuatan tegangan dan penunjuk rintangan cuaca paip, dan paip yang tidak memenuhi syarat adalah dilarang sama sekali untuk memasuki pasaran.

II, teknologi pembinaan sistem anti-karat berbilang lapisan

1. Perlindungan badan paip

memilih paip gred PE100 yang memenuhi tahap tekanan kejuruteraan untuk memastikan ketulenan bahan mentah (kandungan karbon hitam 2.5% -3.0%) untuk meningkatkan keupayaan anti-UV penuaan. Untuk bahagian antara muka, proses sambungan elektroterma diguna pakai, kebersihan permukaan kimpalan perlu dipastikan semasa pembinaan, parameter kimpalan dilaksanakan dengan ketat mengikut lengkung proses yang disediakan oleh pengilang paip, dan ujian tekanan udara 100% dilakukan selepas kimpalan (tekanan 0.15MPa, tekanan dikekalkan selama 30 minit). Reka bentuk lapisan pelindung komposit

Dalam persekitaran tanah yang menghakis sederhana, "tiub PE + lengan pengecutan haba" boleh digunakan untuk perlindungan dua lapisan; salutan anti-karat bitumen epoksi (ketebalan filem kering 0.4mm) perlu ditambah dalam persekitaran yang menghakis. Permukaan paip akan dinyahkerat terlebih dahulu (sehingga tahap Sa2.5), kemudian primer akan disalut dengan proses penyemburan tanpa udara, dan lapisan atas akan disalut dengan kain gentian kaca untuk membentuk sistem anti-karat yang lengkap.

III. Langkah perlindungan komprehensif untuk kerosakan mekanikal

1. Reka bentuk kedalaman tertimbus dan kusyen

tidak kurang daripada 0.7m, turapan tidak kurang daripada 0.5m, dan kedalaman perlu ditambah kepada 1.0m apabila melintasi lorong kenderaan bermotor. Bahagian bawah parit diletakkan dengan kusyen pasir dan batu setebal 200mm (saiz zarah 5-31.5 mm), dan penggetar plat digunakan untuk pemadatan (pemadatan 90%), untuk mengelakkan sentuhan langsung dengan paip dengan objek tajam.

2. Kawalan bahan dan proses pembungkusan semula

menggunakan kaedah pembungkusan semula berlapis: lapisan pertama (300mm di bawah bahagian atas tiub) menggunakan pasir halus dengan saiz zarah 5mm untuk pemadatan manual; lapisan kedua (300- 500mm) diperbuat daripada pembungkusan semula tanah biasa, pemadatan penggelek jalan kecil (93%); lapisan atas hendaklah diisi semula mengikut keperluan asas jalan. Sampah pembinaan atau ketulan beku adalah dilarang sama sekali semasa pembungkusan semula, dan pemadatan mekanikal tidak boleh digunakan dalam julat 500mm di bahagian atas tiub. 1172779813.13. Langkah-langkah amaran dan pengasingan

Letakkan tali pinggang amaran secara berterusan pada 300mm di atas paip (lebar 200mm, dicetak dengan perkataan "kabel kuasa dilarang menggali"), panjang tali pinggang amaran ialah 100mm. Apabila melintasi jalan raya atau kawasan yang terdedah kepada gangguan pembinaan, paip pelindung MPP (diameter paip lebih besar daripada dua peringkat paip kerja) perlu dipasang, kedua-dua hujung paip perlindungan memanjang ke luar tapak 2m.

empat, titik kawalan kualiti pembinaan

1. Kawalan kualiti antara muka

perlu meluruskan paip sebelum kimpalan elektroterma, sisihan 10% ketebalan dinding. Masa penyejukan semula jadi tidak kurang daripada 30 minit selepas kimpalan selesai, dan dilarang sama sekali untuk menggerakkan paip semasa proses penyejukan. Setiap port kimpalan perlu diperiksa (tanpa buih, jidar), dan ujian kerosakan dilakukan pada nisbah 5%. Pengesanan Integriti Lapisan Pelindung

Gunakan pengesan kebocoran nyahcas elektrik (voltan 30kV) untuk mengesan salutan anti-karat dan layak untuk fenomena tidak pecah. Untuk antara muka lengan yang boleh mengecut, kekuatan tegangan lilitan 15MPa, kekuatan pengelupasan 70N / cm perlu dikesan.

3. Selepas saluran paip standard penerimaan siap dipasang, ujian semula ketinggian (sisihan 50mm dibenarkan), ujian semula koordinat (sisihan 100mm dibenarkan) dan ujian kedap udara (tekanan ujian 0.2MPa, penurunan tekanan 1 jam dan penurunan tekanan 0.02MPa) diperlukan. Maklumat penerimaan perlu mengandungi fail lengkap seperti laporan pengesanan tanah, rekod pemeriksaan port kimpalan, data pengesanan lapisan pelindung.

Dengan langkah perlindungan sistemik yang dinyatakan di atas, jangka hayat tiub PE yang terkubur dapat dilanjutkan selama lebih 50 tahun. Dalam amalan kejuruteraan, adalah perlu untuk melaraskan skim perlindungan secara dinamik dalam kombinasi dengan keadaan geologi di tapak, memfokuskan pada pemprosesan antara muka, kualiti pengisian semula dan ketahanan tanda amaran untuk memastikan operasi saluran paip kuasa yang selamat dan stabil jangka panjang.

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