{"id":59402,"date":"2026-04-27T08:00:25","date_gmt":"2026-04-26T23:00:25","guid":{"rendered":"https:\/\/norimen.net\/?p=59402"},"modified":"2026-05-16T18:04:32","modified_gmt":"2026-05-16T09:04:32","slug":"pencegahan-runtuhnya-bangunan-1","status":"publish","type":"post","link":"https:\/\/norimen.net\/id\/construction-collapse-prevention-1\/","title":{"rendered":"Mari kita bahas langkah-langkah pencegahan longsor pada lereng yang sedang dalam proses pembangunan! (Bagian 1)"},"content":{"rendered":"<p>Halo semuanya.<\/p>\n<p>Ini Enta.<\/p>\n<p>&nbsp;<\/p>\n<p>Selama proses konstruksi, lereng mengalami longsor.<\/p>\n<p>Pasti setiap pekerja lereng pernah mengalami momen yang bikin deg-degan atau kecewa, kan?<\/p>\n<p>Kali ini, saya mau coba menulis tentang penyebab dan solusinya, hehe<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-51663\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2024\/06\/2022-08-29-08.54.02.jpg\" alt=\"Keruntuhan\" width=\"600\" height=\"338\" srcset=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2024\/06\/2022-08-29-08.54.02.jpg 600w, https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2024\/06\/2022-08-29-08.54.02-300x169.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<h2>Pada dasarnya, hanya ada tiga jenis lokasi lereng<\/h2>\n<p>Secara garis besar, lokasi pekerjaan di lereng dapat dibagi menjadi tiga jenis ini, bukan?<\/p>\n<p><strong>1. Lereng yang telah runtuh<\/strong><br \/>\n<strong>2. Lereng yang berisiko longsor (lokasi yang menunjukkan tanda-tanda perubahan kondisi dan dirancang dengan asumsi akan longsor dalam waktu dekat)<\/strong><br \/>\n<strong>3. Lereng yang baru terbentuk akibat penggalian untuk membangun struktur seperti jembatan dan terowongan<\/strong><\/p>\n<p>Secara umum, hanya ini saja.<br \/>\nMengenai poin 1, karena sudah runtuh, maka sangat jarang terjadi keruntuhan yang lebih parah dari itu.<\/p>\n<p>Karena sudah rontok, jadi tidak ada lagi yang bisa runtuh, kan.<\/p>\n<p>Jadi, kali ini saya akan fokus menulis tentang poin 2 dan 3 w<\/p>\n<p>&nbsp;<\/p>\n<h2>Saat sedang dalam proses pembangunanlah yang paling berbahaya, inilah alasannya<\/h2>\n<p>Tahap 2 dan 3 memang merupakan tahap yang paling tidak stabil sampai pekerjaan selesai, ya.<\/p>\n<p>Alasannya? Jawabannya sederhana: karena itu \u201ctanah kosong\u201d (w)<\/p>\n<p>Manusia juga pasti merasa gelisah kalau melepas pakaian, kan? Mungkin ada juga yang berpendapat sebaliknya, hehehe<\/p>\n<p>Hal yang sama berlaku untuk lereng; segera setelah lapisan permukaannya dipotong atau dibersihkan dan dirapikan, lereng tersebut berada dalam kondisi telanjang bulat, tanpa vegetasi maupun struktur apa pun.<\/p>\n<p>Lemah.<\/p>\n<p>&nbsp;<\/p>\n<p>Tren ini terutama terlihat jelas di lokasi proyek yang menggunakan metode pemasangan berlawanan arah.<\/p>\n<p>Mengapa harus dilakukan dengan arah berlawanan?<\/p>\n<p>Karena tidak mungkin menebang gunung sekaligus dalam jumlah yang lebih besar, maka penebangan dilakukan sedikit demi sedikit mulai dari bagian atas, sambil menuruni gunung dan menstabilkan setiap lapisan satu per satu.<\/p>\n<p>Hanya itu saja.<\/p>\n<p>Dengan kata lain, penggunaan sistem lilitan terbalik ini menunjukkan bahwa pada tahap perancangan telah disimpulkan bahwa \u201cgunung ini akan runtuh jika dipotong sekaligus\u201d.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-59413\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/04\/9536d88e965bdf306c7592f91c1679b9.jpg\" alt=\"Pemasangan berputar terbalik\" width=\"600\" height=\"338\" \/><\/p>\n<h2>Faktor keamanan 1,2 berlaku pada saat \u201cselesai dibangun\u201d<\/h2>\n<p>Dalam perancangan lereng galian, pendekatan yang umum di Jepang adalah memastikan faktor keamanan rencana pada kondisi normal sebesar Fs = 1,20 atau lebih, dan pada saat gempa sebesar Fs = 1,00 atau lebih.<br \/>\n(Asosiasi Jalan Jepang, \u201cPekerjaan Tanah Jalan Raya\u2014Pedoman Pekerjaan Penggalian Tanah dan Stabilisasi Lereng\u201d, \u201cPedoman Umum Pekerjaan Tanah Jalan Raya\u201d, dan lain-lain)<\/p>\n<p>Hanya saja, ini, bagaimanapun juga,<strong>Keadaan setelah selesai<\/strong>Itulah angka yang diperoleh.<\/p>\n<p>Artinya, wajar jika kita berasumsi bahwa selama proses konstruksi nilainya belum mencapai 1,2, melainkan secara bertahap mendekati 1,2 dari angka sekitar 1,0.<\/p>\n<p>Lalu, pada tahap peralihan itu<\/p>\n<p>Bagaimana jika terjadi hujan lebat?<\/p>\n<p>Bagaimana jika terjadi gempa bumi?<\/p>\n<p>Jika Fs langsung turun di bawah 1,0, itu berarti terjadi keruntuhan, bukan? (Pandangan mengenai hal ini mungkin sedikit berbeda-beda tergantung pada masing-masing insinyur.)<\/p>\n<p>Pada pekerjaan pemasangan tulangan baja maupun jangkar tanah, gaya penahan yang diperkirakan dalam desain baru akan tercapai jika jumlahnya sudah sesuai.<\/p>\n<p>Dengan kata lain, pada saat suntikan pertama diberikan, hanya sebagian kecil dari kekuatan keseluruhan yang mulai terbentuk.<\/p>\n<p>Bahkan dalam kasus rangka penahan yang dipasang dengan metode penyemprotan di lokasi, rangka tersebut sendiri hanyalah elemen penahan tekanan yang berfungsi menahan tanah di sekitarnya; oleh karena itu, rangka tersebut baru dapat berfungsi sesuai desain setelah dipadukan dengan pemasangan tulangan baja atau jangkar.<\/p>\n<p>Meskipun dalam gambar desain proyek ini tampak seolah-olah sudah selesai dalam sekejap, namun di lapangan, pembangunannya dilakukan secara bertahap dan memakan waktu berhari-hari bahkan berminggu-minggu.<\/p>\n<p>Artinya, jika hujan lebat atau gempa bumi terjadi saat berada dalam kondisi \u201csedang bangkit\u201d, kemungkinan untuk langsung gagal akan semakin besar.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-59416\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/04\/2af7e5305fb749cc08f8b38407c38f51.jpg\" alt=\"Grafik garis patah yang menunjukkan peningkatan faktor keamanan lereng (Fs) seiring dengan tahapan konstruksi\" width=\"600\" height=\"338\" \/><\/p>\n<h2>Penyebab keruntuhan, sebagian besar adalah \u201cair\u201d<\/h2>\n<p>Menurut saya, runtuhnya bangunan yang sedang dalam proses pembangunan adalah<strong>Hampir seluruhnya disebabkan oleh air<\/strong>Saya rasa boleh saja mengatakan begitu.<\/p>\n<p>Saya mengerti memang ada berbagai faktor, tetapi pemicunya adalah air.<\/p>\n<p>Akibat hujan yang turun sejak beberapa hari terakhir, ketika saya tiba di lokasi pada pagi hari, rangka penahan yang sedang disemprot tiba-tiba tergelincir.<\/p>\n<p>&nbsp;<\/p>\n<p>Air mengalir dari lubang tempat dilakukan pemasangan tulangan baja.<\/p>\n<p>Setelah hujan, hal-hal seperti ini memang sering terjadi, ya~ w<\/p>\n<p>Kalian pasti tahu kan bahwa air tidak meresap secara merata ke seluruh gunung?<\/p>\n<p>Diperkirakan Mizumichi akan berlari menuju titik terlemah, titik yang mudah kehilangan tekanan, atau titik yang terbuka.<\/p>\n<p>Artinya, lereng yang baru saja dipotong rapi justru cenderung menjadi jalur aliran air. (Airnya akan merembes keluar, bukan?)<\/p>\n<p>Saya rasa Anda akan mengerti jika memikirkan bahwa permukaan yang selama ini tertutup tanah tiba-tiba terbuka, sehingga menjadi saluran keluar bagi tekanan air dari lapisan tanah di bawahnya.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-59417\" src=\"https:\/\/norimen.net\/wordpress\/wp-content\/uploads\/2026\/04\/051bcbe8d146886fbc704f7bcc0fdb91.jpg\" alt=\"Penampang tanah pada lereng galian setelah hujan\" width=\"600\" height=\"338\" \/><\/p>\n<h2>Pelindung lembaran hanyalah tindakan darurat<\/h2>\n<p>Jika ada prakiraan hujan lebat, lakukan pelindung dengan terpal. Ini adalah hal yang paling mendasar.<\/p>\n<p>Namun, pelindung lembaran itu<strong>Ini bukanlah solusi yang mendasar<\/strong>Benar juga, ya.<\/p>\n<p>Hal ini karena, meskipun hujan yang langsung menghantam permukaan lereng dapat dicegah, air yang sudah masuk ke dalam gunung maupun air yang mengalir dari bagian atas lereng tidak dapat dihentikan oleh terpal tersebut.<\/p>\n<p>Selain itu, seperti yang baru saja saya tulis, air akan terkonsentrasi di bagian yang paling lemah.<\/p>\n<p>Fakta yang menyedihkan: meskipun sudah berusaha menutupi seluruh bagian, pada akhirnya justru bagian yang baru saja dipotonglah yang menimbulkan masalah, haha.<\/p>\n<p>Memang, kadang-kadang meskipun sudah ditutupi dengan selimut, bagian dalamnya tetap hancur, kan?<\/p>\n<p>&nbsp;<\/p>\n<p>Lapisan tersebut berfungsi untuk \u201cmelindungi dari hujan hari ini\u201d, bukan untuk \u201cmenstabilkan tanah\u201d. (Meskipun begitu, lebih baik daripada tidak dilakukan sama sekali.)<\/p>\n<p>Namun, karena hal ini tidak bisa diabaikan (berbagai langkah pencegahan yang terlihat di permukaan memang diperlukan), berikut adalah beberapa tips saat memasang penutup, yaitu,<\/p>\n<p>Tekan dengan kuat menggunakan karung pasir!<\/p>\n<p>Letakkan papan penopang dan bahan perancah, dsb., dengan menyandarkannya!<\/p>\n<p>Hanya dengan ini saja, sudah tercipta efek jera di bagian itu, hehe<\/p>\n<p>&nbsp;<\/p>\n<p>Sampai jumpa lagi.<\/p>","protected":false},"excerpt":{"rendered":"<p>Halo semuanya. Ini Enta.   Lereng longsor saat pengerjaan. Pasti setiap pekerja lereng pernah mengalami momen yang bikin deg-degan atau kecewa, kan? Kali ini, saya mau coba menulis tentang penyebab dan cara mengatasinya w. Pada dasarnya, hanya ada tiga jenis lokasi pekerjaan lereng. Lokasi pekerjaan lereng itu\u2026<\/p>","protected":false},"author":2,"featured_media":59412,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[34,43],"tags":[2310,4756,6041,14269],"class_list":["post-59402","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-slope-work","category-issues","tag-2310","tag-4756","tag-6041","tag-14269"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u5207\u571f\u6cd5\u9762 \u5b89\u5168\u7387 1.2 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