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Write structurally and compute.

2025/8/14 Edited to

... Read moreเวลาคนหา “แปลนคาน/แปลนคานหลังคา/แบบขยายฐานราก” ส่วนใหญ่ต้องการเอาไปเทียบกับหน้างานหรือใช้เป็นแนวทางตอนทำแบบกับทำรายการคำนวณ ฉันเลยสรุปจุดที่ใช้เช็กงานบ่อย ๆ ให้แบบใช้งานได้จริง (โดยเฉพาะงานหลังคาเมทัลชีท งานคานคอดิน และฐานราก) 1) แปลนโครงสร้าง vs แบบขยายโครงสร้าง ดูอะไรเป็นหลัก - แปลนโครงสร้าง/แปลนคาน: เอาไว้ดู “ตำแหน่ง” คาน-เสา-ผนังรับแรง ระยะกริด และระดับพื้น (อย่าลืมเช็กสเกล เช่น 1:100) - แบบขยายคาน/แบบขยายฐานราก: เอาไว้ดู “หน้าตัด+เหล็กเสริม” เช่น ขนาดคาน, ระยะหุ้มคอนกรีต, เหล็กปลอก, เหล็กเสริมบน-ล่าง และจุดต่อทาบ/งอเหล็ก 2) เช็กแปลนคานคอดิน/คานพื้นให้ไม่พลาด - เช็กทิศทางคานกับตำแหน่งเสา: คานบางเส้นจะรับผนังหรือรับพื้นต่างกัน ทำให้เหล็กบน/ล่างไม่เท่ากัน - เช็กระดับคานคอดินสัมพันธ์กับงานถมดิน: ถ้ามี “แบบแปลนถมดิน CAD” ให้เทียบระดับดินสำเร็จกับท้องคานกันชนคานจมดิน - เช็กจุดชนกันของคาน (คานตัดคาน): แบบขยายคานมักบอกเหล็กเสริมพิเศษบริเวณหน้าตัดวิกฤต 3) แปลนคานหลังคา + แบบขยายหลังคาเมทัลชีท งานหลังคามักมีทั้งคานหลังคา/โครงหลังคา และรายละเอียดแผ่นเมทัลชีท ถ้าเห็นในแบบมี “รายการเหล็กหลังคา” หรือระบุเหล็กกล่อง เช่น 12x12x2.3 มม. และ 4x2x2.3 มม. ให้เช็กเพิ่ม: - ระยะห่างแป/จันทัน และทิศทางวาง (สัมพันธ์กับแนวสันจั่วในรูปตัดหลังคาจั่ว) - จุดยึดกับคาน/เสา: มักมีเพลท + J Bolt ระยะฝัง/ระยะขอบที่ต้องทำตามแบบ - จุดต่อ/ซ้อนทับแผ่นเมทัลชีท และตำแหน่งครอบสัน/แฟลชชิ่ง (กันรั่ว) 4) ตัวอย่างการคำนวณแรงลมหลังคา (แนวคิดที่ใช้ตอนทำรายการคำนวณ) เวลาทำรายการคำนวณ ฉันจะเริ่มจาก “แรงลมกระทำบนหลังคา” แล้วกระจายลงสมาชิกโครง (แป/จันทัน/คานหลังคา) จุดสำคัญคือ: - เลือกค่าความเร็วลมตามพื้นที่ และค่าสัมประสิทธิ์ตามรูปทรงหลังคา (หลังคาจั่ว/เพิงหมาแหงนจะต่างกัน) - คิดแรงดูด (uplift) ที่มักเป็นเคสคุมสำหรับเมทัลชีทและจุดยึด - ตรวจสมาชิกเหล็กกล่อง/เหล็กรูปพรรณทั้งกำลังดัด-เฉือน และการโก่ง 5) จัดทำ “รายการคำนวณโครงสร้าง Excel” ให้ตรวจง่าย ถ้าคนค้นหาอยากได้แนวทางไฟล์ Excel ฉันแนะนำจัดชีตประมาณนี้: - Sheet 1: ข้อมูลวัสดุ (fc’, fy) เช่น ค่ากำลังอัดคอนกรีต 280 ksc, เหล็ก SD40/SD50 - Sheet 2: โหลด (DL/LL/ลม) แยกส่วนหลังคา-พื้น - Sheet 3: คาน (สรุปหน้าตัด, As บน/ล่าง, ปลอก, ระยะทาบ) - Sheet 4: เสา/ฐานราก (แรงอัด/โมเมนต์, ขนาดฐาน, เหล็กเสริม) - Sheet 5: สรุปรายการเหล็ก (Bar bending schedule) ให้ตรงกับ “ตารางรายละเอียดเหล็กเสริม” ในแบบขยาย สุดท้าย ถ้าต้องส่งเซ็นรับรอง/จัดทำเล่มรายการคำนวณ ฉันจะไฮไลต์หน้า “แปลนคาน + แบบขยายคาน/ฐานราก + รูปตัดหลังคาจั่ว” และทำสารบัญให้ไล่ตามแบบ จะช่วยให้ผู้ตรวจเปิดตามได้เร็วและลดการแก้แบบวน ๆ

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