Basic rules:
1 : (跨過)4 個 鏍絲。最佳
2: 3 個
3 加 枋頭/短威令
4 騎馬仔,搖搖板
威令最少要有2隻“眼”, for top row.
最好三個眼或以上
常用短威令:
1.2, 1.5 ,1.8m
要突出牆身250mm min, for 轉角螺絲
Corner 要夠力,
第一 column 200 to 350mm from corner
間距:
Example:
垂直板枋距: 300mm
Column 鏍絲 tie bar spacing (mm):
200 ( or below)
800
1500
2300
旁邊adjacent corner直角牆(避免撞威令):
300
900
1600
2400
水平間距(mm):
600-750
鎖角板/鎖角牌
螺絲 allowable tilt wrt horizontal is ~ 5 degrees max for double wales. But, within 2~3 degrees preferred.
大範拉扯pull細範
Wales dimension:
50 d* 70h
Middle spacing:20
介指washer 70 square
絲母: 20
Screaw: 17, 6 tpi
轉角 wale ,突出 200
外皮,第一口螺絲: 500-600
Pressure:
Reference
Cityu BST22348
Polyu BRE4393
Kctang measurements of concrete works
Formwork Design: Determining the Spacing of Studs, Wales, and Snap Ties for a Concrete Wall Formwork System
VTC course 1301
Wales screw spec
Hydrostatic pressure calculation
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