对拉螺栓（Pull bolt）.doc

对拉螺栓（Pull bolt） First according to the specification of the concrete formwork lateral pressure calculation calculated by lateral pressure (surface load) by single template area, get the focus, and then select the focus bar, and calculate the cross section and the cross section for rod spacing. Note the thread net section, the general bar D12\D16 koala as a standard rod, the nut on the market, D14 is not a standard rod, with as little as possible; waterstop specifications for D 40 cm, thickness 3 mm; the calculation may refer to the following: the wall formwork supporting calculation The new standard of lateral pressure on the value of concrete pouring template: F=0.22rct0 beta 1 beta 2v1/2 F=rcH Take the small side pressure standard value above two calculated value Rc=24KN/m3 T0=200/ (T+15) =200/ (15+15) =6.67 Beta 1=1.2 (additive correction coefficient) Beta 2=1.0 (field slump in 10-12cm) V=1.5m/h H=5.9m The F=0.22 rct0 beta 1 beta 2v1/2 = 0.22 x 24 x 6.67 x 1.2 x 1 x 1.51/2 =51.76KN/m2 F=rcH =24 * 5.92 =142.08KN/m2 The load standard value for small value: F=51.76 KN/m2 The lateral pressure value of F6=1.2 * F=62.11KN/m2 Head of h= F6/rc=2.59m The horizontal load produced the standard value of 2KN/m2 during concrete pouring The horizontal load design value F6=1.4 * 2=2.8KN/m2 The template checking As shown in Figure 80, vertical ribs 60 * @ 300 square, with 48 to 2 rib steel @ 600 beta 1, take the board as the study object. LX=30cm Ly=60cm LX/Ly=0.5 According to the two-way slab (four in bearing plate) calculation, Check the static calculation Handbook available: KMx=0.0400 KMY=0.0038 KF=0.00253 A, in the mid span moment MX=KmX - QL2 My=Kmy - QL2 Q=62.11KN/m2=6.211 N/cm2 L l=30cm is the minimum length of the rectangle. MX=0.0400 * 6.211 * 302=223.596 N cm My=0.0038 * 6.211 * 302=21.24 N cm The Poissons ratio of u=1/12 MX (U) = MX+u My = 225.4 N - CM My (U) = My+u MX = 39.9 N - CM Mmax=225.4 N - CM The plate bending moment W (panle width 1cm) W=bh2/6=1 * 1.62/6=0.4