"Cua lua he 55 PMA, mot lua chon pho bien trong thiet ke kien truc hien dai, mang lai su tien loi va tinh tham my cao. Tuy nhien, trong qua trinh thi cong va lap dat, viec tinh toan kich thuoc cua sao cho chuan xac, tranh sai sot va lang phi vat tu, luon la mot bai toan nan giai. Neu ban dang tim kiem mot phuong phap hieu qua de giai quyet van de nay, thi Cong thuc tru cua lua he 55 PMA chinh la ""chia khoa vang"" ma ban can nam vung. Bai viet nay se di sau vao cach ap dung cong thuc nay mot cach don gian va chinh xac nhat.



Hieu Ro Ve Cua Lua He 55 PMA



cua nhom xingfa - Truoc khi di vao cong thuc, chung ta can hieu ro ve he nhom 55 PMA. Day la mot he nhom chuyen dung cho cua lua, thuong duoc ung dung trong cac cong trinh yeu cau do ben cao, kha nang cach am, cach nhiet tot va dac biet la tinh tham my vuot troi. He 55 PMA co cac ranh ky thuat va phu kien dong bo, doi hoi su chinh xac tuyet doi trong kich thuoc khi cat xe va lap dat.



Viec sai sot du chi vai milimet trong kich thuoc khung bao hoac canh cua cung co the dan den tinh trang cua bi venh, ket rit khi su dung, hoac te hon la phai lam lai toan bo san pham, gay ton kem chi phi va thoi gian.



Vi Sao Can Ap Dung Cong Thuc Tru Chuan Xac?



Muc dich chinh cua viec ap dung cong thuc tru la xac dinh kich thuoc thuc te cua kinh va do nhom sau khi da tru di cac khoang ho can thiet cho gioang, ke ep goc, va cac phu kien khac.



Khoang ho nay rat quan trong:

1. Gioang va keo silicone: Can khong gian de gioang cao su om khit khung nhom va kinh, dam bao do kin khit, chong tham nuoc va bui ban.

2. Khe ho gian no nhiet: Kim loai luon co su co gian nhat dinh theo nhiet do moi truong, can co khoang trong de tranh hien tuong kenh, venh khi thoi tiet thay doi dot ngot.

3. De dang lap dat: Neu kich thuoc qua khit, viec dua kinh vao ray va lap cac phu kien se vo cung kho khan.



Cong Thuc Tru Cua Lua He 55 PMA Chi Tiet



Cong thuc tru cho cua lua he 55 PMA thuong duoc chia thanh hai phan: tru chieu ngang va tru chieu cao. Tuy nhien, dieu quan trong nhat la xac dinh phan tru cho kinh (hay con goi la kich thuoc lot long khoet lo) va phan tru cho do nhom bao khung.



1. Cong Thuc Tinh Kich Thuoc Kinh Lot Long (Kich thuoc phu bi cua)



Kich thuoc phu bi (hay con goi la kich thuoc lot long khoet lo) la kich thuoc ma ban can cung cap cho tho xay dung hoac ben thi cong phan tuong bao.



Kich thuoc Kinh = Kich thuoc Lot Long Khoet Lo - (He so tru chung)



Trong he 55 PMA, cac he so tru nay duoc quy dinh dua tren thiet ke ray, gioang va phu kien tieu chuan cua he nhom.



He so tru chung (Tham khao theo tieu chuan he 55 PMA pho bien):



Tru Chieu Ngang (Ngang Lot Long): Khoang -10mm den -15mm (Tuy thuoc vao do day ray truot va gioang ni). Thong thuong, tru 12mm la an toan nhat cho ca hai ben lap dat gioang.

Tru Chieu Cao (Cao Lot Long): Khoang -10mm den -12mm. Phan tru tren thuong lon hon mot chut de dam bao co du khong gian cho ray duoi va ron tren.



Vi du minh hoa:



Neu ban muon lam cua lua co kich thuoc lot long tuong la Rong 2000mm x Cao 2200mm.



Kich thuoc Kinh (Ngang): 2000mm - 12mm = 1988mm

Kich thuoc Kinh (Cao): 2200mm - 12mm = 2188mm



2. Cong Thuc Tinh Kich Thuoc Do Nhom (Khung Bao)



Day la phan quan trong nhat khi tinh toan vat tu nhom. Kich thuoc do nhom duoc tinh dua tren kich thuoc lot long khoet lo va he so tru phu kien lap rap.



Kich thuoc Do Nhom (Chua bao gom ke goc):



Chieu Ngang Do Nhom: Kich thuoc Lot Long Ngang - (2 x He so tru gioang ngang)

Chieu Cao Do Nhom: Kich thuoc Lot Long Cao - (He so tru ray duoi + He so tru ron tren)



Luu y: Khi tinh kich thuoc nhom, ban phai tinh rieng cho tung cay do: do khung bao, do canh, do dung, do ngang.



Vi du voi He 55 PMA chuan:



Gia su kich thuoc lot long khoet lo la 2000 x 2200 (mm).



1. Tinh Do Ngang Tren va Duoi (Ray):

Kich thuoc cay nhom can cat = Kich thuoc Lot Long Ngang – (Khoang cach Gioang 2 ben)

Vi du: 2000mm – 12mm = 1988mm (Day la kich thuoc phu bi cua cay ngang).



2. Tinh Do Dung (Khung Bao Canh):

Kich thuoc cay nhom can cat = Kich thuoc Lot Long Cao – (He so tru Ray duoi + He so tru Ron tren)

Neu he so tru ray duoi la 8mm va ron tren la 5mm: 2200mm – (8mm + 5mm) = 2187mm.



Luu y Quan Trong Ve Ke Goc (Ke Ep Goc):



Khi tinh toan cac cay do bao quanh khung, ban phai tinh den do day cua ke goc (thuong la 40mm hoac 50mm tuy loai ke). Khi ghep goc vuong, kich thuoc thuc te cua khung bao se duoc xac dinh boi chieu dai cua cay nhom da cat va do day cua ke.



Bi Quyet Thuc Hanh Toi Uu Cho Tho Chuyen Nghiep



De dam bao cong thuc duoc ap dung chinh xac 100% tren cong trinh, cac don vi thi cong chuyen nghiep thuong ap dung cac meo sau:



1. Luon Tra Cuu Ban Ve Chi Tiet He Nhom: Moi nha san xuat he 55 PMA co the co dung sai nho ve phu kien. Hay luon tham khao ban ve chi tiet ky thuat ma nha cung cap he nhom cung cap de co he so tru chinh xac nhat.

2. Do Dac Nhieu Diem: Khi do lo tuong, khong bao gio chi do mot diem. Hay do it nhat 3 diem (tren, giua, duoi va 3 diem ngang) va lay so do nho nhat de lam co so tinh toan. Dieu nay giup tranh truong hop tuong bi nghieng hoac cong venh.

3. Lam Viec Tren Kich Thuoc Kinh: Don gian nhat la xac dinh kich thuoc kinh can dat truoc. Sau do, dua tren kich thuoc kinh va he so tru co dinh (vi du: 12mm cho ca hai chieu), tinh nguoc lai ra kich thuoc lot long khoet lo de giao cho tho xay.



Viec nam vung Cong thuc tru cua lua he 55 PMA khong chi giup tiet kiem vat lieu ma con dam bao chat luong san pham cuoi cung dat do hoan my cao nhat, dung chuan thiet ke kien truc hien dai. Day la kien thuc nen tang khong the thieu cho bat ky ai lam trong nganh nhom kinh hien nay."

Xem them: Cong thuc tru cua lua he 55 PMA