{"id":42304,"date":"2020-07-22T08:00:39","date_gmt":"2020-07-21T23:00:39","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=42304"},"modified":"2026-05-17T11:01:45","modified_gmt":"2026-05-17T02:01:45","slug":"hujan-beton-30-persen-keputusan","status":"publish","type":"post","link":"https:\/\/norimen.net\/id\/concrete-rain-30-percent-decision\/","title":{"rendered":"Probabilitas hujan pada hari pengecoran beton adalah 30%\u2026 Haruskah dilakukan, atau ditunda?"},"content":{"rendered":"

Pekerjaan kedap air atap yang nasibnya ditentukan oleh cuaca<\/h2>\n

Sekarang internet sudah tersebar luas sehingga kita bisa melihat ramalan cuaca secara real-time, tetapi ketika saya masih muda, kami hanya mengandalkan koran dan TV, jadi menurut saya membaca cuaca saat itu lebih sulit daripada sekarang.<\/p>\n

Cuaca memang tidak selalu sesuai dengan keinginan kita, jadi jika kita salah mengambil keputusan, tentu saja hal itu bisa berujung pada kegagalan besar...<\/p>\n

Saya masih ingat dengan jelas pekerjaan kedap air di atap itu, di mana cuaca menjadi penentu nasibnya.<\/p>\n

\"\u96e8\"<\/p>\n

Ditinggalkan oleh langit, hujan lebat saat proses pengecoran<\/h2>\n

Pada hari pengecoran beton ringan untuk lapisan kedap air di atap, prakiraan cuaca menunjukkan probabilitas hujan sebesar 30%. Apakah sebaiknya beton dicor sesuai rencana atau ditunda? Saya cukup ragu, tetapi karena\u2014seperti biasa\u2014proyek ini tidak memiliki batas waktu pengerjaan, akhirnya kami memutuskan untuk melanjutkan pengecoran.<\/p>\n

Saya rasa setiap insinyur manajemen konstruksi pasti pernah setidaknya sekali menghadapi situasi serupa, namun dalam kasus saya, keputusan tersebut justru berbalik merugikan.<\/p>\n

Pada pagi hari saat pengecoran, langit tampak mendung. Saya sempat merasa lega karena sepertinya semuanya akan berjalan lancar, tetapi ketika pengecoran sudah mencapai sekitar 70 persen, langit tiba-tiba menjadi gelap, dan tak lama kemudian hujan lebat pun turun.<\/p>\n

\u201cApakah langit telah meninggalkan aku!?\u201d gumamku dalam hati, mengutip kalimat terkenal dari film Gunung Hakkoda. Namun, tak ada yang bisa kulakukan selain melanjutkan pengecoran beton pada bagian yang tersisa dan melapisinya dengan terpal pelindung. Yang lebih menyebalkan lagi, hujan pun berhenti tepat pada saat itu, seolah-olah sudah direncanakan.<\/p>\n

Keesokan harinya, permukaan atas beton dibersihkan dengan baik menggunakan sikat atau alat sejenis, dan pada hari berikutnya dilakukan pengerjaan finishing dengan sekop logam untuk mortar, sehingga pekerjaan pun selesai.<\/p>\n

Namun, seminggu kemudian, saya mendapati diri saya menyaksikan pemandangan yang belum pernah saya lihat sebelumnya.<\/p>\n

Permukaan atas beton berubah menjadi \u201ckerupuk genteng\u201d<\/h2>\n

Saat naik ke atap, sejauh mata memandang, bagian lantai dari mortar itu menonjol di bagian sambungan dan melengkung ke atas seperti kerupuk genteng berukuran sekitar 2 meter.<\/p>\n

Saya sudah melihat berbagai lokasi proyek, tetapi ini adalah pertama kalinya saya menjumpai fenomena seperti ini. Para pekerja di lokasi proyek pun tercengang. Rupanya, hanya dengan menyikat permukaan beton yang terkena hujan saja tidak cukup untuk memastikan daya rekat yang baik...<\/p>\n

Karena tidak ada batas waktu pengerjaan, keesokan harinya dalam satu hari kami menghaluskan mortar lantai dan mengikis kelebihannya, lalu mengkasarkan permukaan beton yang terkena hujan menggunakan sikat gerinda dan alat sejenisnya. Setelah dicuci bersih dengan air, kami kembali meratakan mortar menggunakan sekop logam.<\/p>\n

Untungnya, karena tingkat kelengkungan dan retakannya sangat parah, sambungan ekspansi yang berfungsi ganda sebagai beton dan mortar dapat tetap digunakan apa adanya.<\/p>\n

Proyek ini dilakukan 30 tahun yang lalu, berupa bangunan dua lantai dengan luas total konstruksi atap sekitar 300 m\u00b2. Saya ingat biaya yang dikeluarkan untuk pengikisan, pengkasaran permukaan, pembuangan puing, serta pemasangan mortar ulang mencapai sekitar 700.000 yen. Untungnya, proyek ini memiliki margin keuntungan yang tinggi, jadi kami bisa melewatinya dengan baik...<\/p>\n

Sekarang, saya menyadari bahwa seharusnya, betapapun ketatnya tenggat waktu proyek tersebut, saya meminta masukan dari sebanyak mungkin tenaga ahli berpengalaman dan melakukan pekerjaan dengan lebih hati-hati. Keputusan saya untuk melakukan persiapan permukaan bagian atas yang terkena hujan dengan cara yang seminimal mungkin menghabiskan tenaga dan biaya justru berujung pada situasi yang pada akhirnya menghabiskan lebih banyak waktu dan biaya.<\/p>\n

Bagaimanapun juga, ini adalah salah satu kejadian yang membuat saya menyadari bahwa kita memang tidak bisa mengalahkan cuaca.<\/p>\n

 <\/p>\n

\"\"<\/div>
Dewa Konstruksi | Media Konstruksi Era Baru<\/div>
45.145 posting<\/div>
23 pengguna<\/div><\/div><\/div>
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Dewa Konstruksi | Media Konstruksi Era Baru<\/div>
https:\/\/sekokan-navi.jp\/magazine\/<\/div>
\"Dewa Konstruksi\" adalah media konstruksi era baru yang membahas tantangan nyata yang dihadapi para insinyur konstruksi dari sudut pandang \"kegagalan\".<\/div><\/div>
<\/div><\/div><\/a><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Pekerjaan kedap air atap yang nasibnya ditentukan oleh cuaca. Sekarang internet sudah meluas sehingga kita bisa melihat ramalan cuaca secara real-time, tetapi ketika saya masih muda, kami hanya mengandalkan koran dan TV, jadi menurut saya membaca cuaca saat itu lebih sulit daripada sekarang. Cuaca memang satu-satunya hal yang tidak bisa kita kendalikan sesuai keinginan\u2026<\/p>","protected":false},"author":2,"featured_media":39421,"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_total_topic_count_hidden":0,"_bbp_total_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1231],"tags":[1246],"class_list":["post-42304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1231","tag-1246"],"acf":[],"yoast_head":"\n\u30b3\u30f3\u30af\u30ea\u30fc\u30c8\u6253\u8a2d\u65e5\u306e\u964d\u6c34\u78ba\u7387\u306f30%\u2026\u6253\u3064\u3079\u304d\u304b\u3001\u5ef6\u671f\u3059\u3079\u304d\u304b\uff1f 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