石景山北辛安棚戶區(qū)改造/r/nA/r/n區(qū)項(xiàng)目/r/n1608-656/r/n地塊/r/n地上外腳手架施工方案/r/n編制人：/r/n審核人：/r/n審批人：/r/n中建三局集團(tuán)有限公司/r/n北辛安棚戶區(qū)改造/r/nA/r/n區(qū)/r/n1608-656/r/n地塊項(xiàng)目部/r/n二/r/no/r/n一八、年八月二十三日/r/n中建國際建設(shè)有限公司/r/n中建國際建設(shè)有限公司/r/n上人馬道施工方案》/r/n第/r/n上人馬道施工方案》/r/n第/r/n/r/n24/r/n頁共/r/n24/r/n頁/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)(慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目)/r/n經(jīng)計(jì)算得到，靜荷載標(biāo)準(zhǔn)值/r/nN/r/ng/r/n=/r/nN/r/nG1/r/n+N/r/nG2/r/n+N/r/nG3/r/n+N/r/nG4/r/n=/r/n6.861kN/r/n。/r/nG/r/nG1G2G3G4/r/n活荷載為施工荷載標(biāo)準(zhǔn)值產(chǎn)生的軸向力總和，內(nèi)、外立桿按一縱距內(nèi)施工荷/r/n載總和的/r/n1/2/r/n取值。/r/n經(jīng)計(jì)算得到，活荷載標(biāo)準(zhǔn)值/r/nN/r/n二/r/n2.000X8X1.200/r/nX/r/n1.200/2=11.520kN/r/nQ/r/n風(fēng)荷載標(biāo)準(zhǔn)值應(yīng)按照以下公式計(jì)算/r/n其中/r/nW/r/n0/r/n——基本風(fēng)壓/r/n(kN/m/r/n2/r/n),/r/nW/r/n0/r/n=/r/n0.300/r/nU/r/n——風(fēng)荷載高度變化系數(shù)，/r/nU/r/n=/r/n1.000/r/nz/r/nz/r/nU/r/n——風(fēng)荷載體型系數(shù)：/r/nU/r/n=/r/n0.600/r/ns/r/ns/r/n經(jīng)計(jì)算得到：/r/nW/r/n=/r/n0.300X1.000X0.600/r/n=/r/n0.180kN/m/r/n2/r/n。/r/nk/r/n考慮風(fēng)荷載時(shí)，立桿的軸向壓力設(shè)計(jì)值計(jì)算公式/r/nN/r/n=/r/n1.2N/r/n+/r/n0.9X1.4N/r/nG/r/nQ/r/n經(jīng)過計(jì)算得到，底部立桿的最大軸向壓力：/r/nN=1.2X6.861+0.9X1.4X11.520=22.748kN/r/n不考慮風(fēng)荷載時(shí)，立桿的軸向壓力設(shè)計(jì)值計(jì)算公式/r/nN/r/n=/r/n1.2N/r/n+/r/n1.4N/r/nG/r/nQ/r/n經(jīng)過計(jì)算得到，底部立桿的最大軸向壓力：/r/nN=1.2X6.861+1.4X11.520=24.361kN/r/n風(fēng)荷載設(shè)計(jì)值產(chǎn)生的立桿段彎矩/r/nM/r/nw/r/n計(jì)算公式/r/nW/r/nM/r/n=/r/n0.9X1.4Wlh/r/n2/r/n/10/r/nW/r/nka/r/n其中/r/nW/r/n——/r/n風(fēng)荷載標(biāo)準(zhǔn)值/r/n(kN/m/r/n2/r/n)；/r/nl/r/n――立桿的縱距/r/n(m)/r/n；/r/na/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)(慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目)/r/nh/r/n立桿的步距/r/n(m)/r/n。/r/n經(jīng)過計(jì)算得到風(fēng)荷載產(chǎn)生的彎矩：/r/nM=0.9X1.4X0.180X1.200X1.500X1.500/10=0.061kN.m/r/nw/r/n六、立桿的穩(wěn)定性計(jì)算：/r/n1./r/n不考慮風(fēng)荷載時(shí)，立桿的穩(wěn)定性計(jì)算/r/n其中/r/nN/r/n——/r/n立桿的軸心壓力設(shè)計(jì)值，/r/nN=24.361kN；/r/ni/r/n――/r/n計(jì)算立桿的截面回轉(zhuǎn)半徑，/r/ni=1.59cm；/r/nk/r/n——/r/n計(jì)算長度附加系數(shù)，取/r/n1.155；/r/nu/r/n——計(jì)算長度系數(shù)，由腳手架的高度確定，/r/nu=1.700；/r/nl/r/n0/r/n——計(jì)算長度/r/n(m),/r/n由公式/r/nl/r/n0/r/n=/r/nkuh/r/n確定，/r/nl/r/no/r/n=1.155X1.700X1.500=2.550m；/r/nA/r/n立桿凈截面面積，/r/nA=4.500cm/r/n2/r/n；/r/nW/r/n——/r/n立桿凈截面模量(抵抗矩/r/n)，W=4.730cm/r/n3/r/n；/r/n入——由長細(xì)比，為/r/n2550/16=160；/r/n?/r/n――軸心受壓立桿的穩(wěn)定系數(shù)，由長細(xì)比/r/nl/r/n0/r/n/i/r/n的結(jié)果查表得到/r/n0.203；/r/n。一一鋼管立桿受壓強(qiáng)度計(jì)算值/r/n(N/mm/r/n2/r/n)/r/n；/r/n[f]/r/n——/r/n鋼管立桿抗壓強(qiáng)度設(shè)計(jì)值，/r/n[f]=300.00N/mm/r/n2/r/n；/r/n經(jīng)計(jì)算得到：/r/no=24361/(0.20X450)=266.680N/mm/r/n2/r/n；/r/n不考慮風(fēng)荷載時(shí)，立桿的穩(wěn)定性計(jì)算。/r/n＜/r/n[f],/r/n滿足要求！/r/n2./r/n考慮風(fēng)荷載時(shí)，立桿的穩(wěn)定性計(jì)算/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)（慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目）/r/n■/r/n十叫/r/n打/r/n徑/r/nW/r/n其中/r/nN/r/n——/r/n立桿的軸心壓力設(shè)計(jì)值，/r/nN=22.748kN；/r/ni/r/n――/r/n計(jì)算立桿的截面回轉(zhuǎn)半徑，/r/ni=1.59cm；/r/nk/r/n——/r/n計(jì)算長度附加系數(shù)，取/r/n1.155；/r/nu/r/n——計(jì)算長度系數(shù)，由腳手架的高度確定，/r/nu=1.700；/r/nl/r/n0/r/n——計(jì)算長度/r/n（m）,/r/n由公式/r/nl/r/n0/r/n=/r/nkuh/r/n確定，/r/nl/r/no/r/n=1.155X1.700X/r/n1.500=2.550m；/r/nA/r/n立桿凈截面面積，/r/nA=4.500cm/r/n2/r/n；/r/nW/r/n——/r/n立桿凈截面模量（抵抗矩/r/n），W=4.730cm/r/n3/r/n；/r/n入——由長細(xì)比，為/r/n2550/16=160；/r/n?/r/n――軸心受壓立桿的穩(wěn)定系數(shù)，由長細(xì)比/r/nl/r/n0/r/n/i/r/n的結(jié)果查表得到/r/n0.203；/r/nM/r/nW/r/n計(jì)算立桿段由風(fēng)荷載設(shè)計(jì)值產(chǎn)生的彎矩，/r/nM/r/nw/r/n=0.061kN.m；/r/nW/r/nW/r/n。一一鋼管立桿受壓強(qiáng)度計(jì)算值/r/n（N/mm/r/n2/r/n）/r/n；/r/n[f]/r/n——/r/n鋼管立桿抗壓強(qiáng)度設(shè)計(jì)值，/r/n[f]=300.00N/mm/r/n2/r/n；/r/n經(jīng)計(jì)算得到/r/n。/r/n=22748/（0.20X450）+61000/4730=261.971N/mm/r/n2/r/n；/r/n考慮風(fēng)荷載時(shí)，立桿的穩(wěn)定性計(jì)算。/r/n＜/r/n[f],/r/n滿足要求！/r/n七、最大搭設(shè)高度的計(jì)算：/r/n不考慮風(fēng)荷載時(shí)，雙排腳手架允許搭設(shè)高度/r/n[H],/r/n按下列計(jì)算：/r/n旳-/r/n其中/r/nN/r/ng2k/r/n——構(gòu)配件自重標(biāo)準(zhǔn)值產(chǎn)生的軸向力，/r/nN/r/ng2k/r/n=/r/n4.116kN；/r/nG2K/r/nG2K/r/nN/r/nq/r/n——/r/n活荷載標(biāo)準(zhǔn)值，/r/nN/r/nq/r/n=/r/n11.520kN；/r/nQ/r/nQ/r/ng/r/n——/r/n每米立桿承受的結(jié)構(gòu)自重標(biāo)準(zhǔn)值，/r/ng/r/n=/r/n0.102kN/m；/r/nk/r/nk/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)(慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目)/r/n經(jīng)計(jì)算得到，不考慮風(fēng)荷載時(shí)，按照穩(wěn)定性計(jì)算的搭設(shè)高度/r/n[H]/r/n=/r/n51.949/r/n米。/r/n考慮風(fēng)荷載時(shí)，雙排腳手架允許搭設(shè)高度/r/n[H],/r/n按下列計(jì)算：/r/n屈/r/n”[1.2/r/n護(hù)蚣+叩燈/r/n40/r/n逐+姐皿加眄]/r/nI/r/n■列/r/n=/r/n1/r/n衛(wèi)％/r/n其中/r/nN/r/ng2k/r/n——構(gòu)配件自重標(biāo)準(zhǔn)值產(chǎn)生的軸向力，/r/nN/r/ng2k/r/n=/r/n4.116kN；/r/nG2K/r/nG2K/r/nN/r/nq/r/n——活荷載標(biāo)準(zhǔn)值，/r/nN/r/nq/r/n=/r/n11.520kN；/r/nQ/r/nQ/r/ng/r/n——/r/n每米立桿承受的結(jié)構(gòu)自重標(biāo)準(zhǔn)值，/r/ng/r/n=/r/n0.102kN/m；/r/nk/r/nk/r/nM/r/nk/r/n――/r/n計(jì)算立桿段由風(fēng)荷載標(biāo)準(zhǔn)值產(chǎn)生的彎矩，/r/nM/r/nk/r/n=0.049kN.m；/r/nwk/r/nwk/r/n經(jīng)計(jì)算得到，考慮風(fēng)荷載時(shí)，按照穩(wěn)定性計(jì)算的搭設(shè)高度/r/n[H]/r/n=/r/n55.475/r/n米。/r/n取上面兩式計(jì)算結(jié)果的最小值，腳手架允許搭設(shè)高度/r/n[H]=51.949/r/n米。/r/n根據(jù)規(guī)范構(gòu)造要求，腳手架搭設(shè)高度不宜超過/r/n24/r/n米；當(dāng)超過/r/n24/r/n米時(shí)，應(yīng)另行專門設(shè)計(jì)。/r/n八、連墻件的計(jì)算：/r/n連墻件的軸向力計(jì)算值應(yīng)按照下式計(jì)算：/r/nTOC\o"1-5"\h\z/r/nN/r/n=/r/nN/r/n+/r/nN/r/n

/r/nl/r/nlw/r/no/r/n其中叫/r/n風(fēng)荷載產(chǎn)生的連墻件軸向力設(shè)計(jì)值/r/n(kN)/r/n，應(yīng)按照下式計(jì)算:/r/nlw/r/nN/r/n=/r/n1.4/r/nX/r/nw/r/nX/r/nA/r/n

/r/nlw/r/nk/r/nw/r/nw/r/n——風(fēng)荷載標(biāo)準(zhǔn)值，/r/nw/r/n=/r/n0.180kN/m/r/n2/r/n；/r/nk/r/nk/r/nA/r/n――每個(gè)連墻件的覆蓋面積內(nèi)腳手架外側(cè)的迎風(fēng)面積：/r/nw/r/nA/r/n=/r/n4.50X3.60/r/n=/r/n16.200m/r/n2/r/n；/r/nw/r/nN/r/n——連墻件約束腳手架平面外變形所產(chǎn)生的軸向力/r/n(kN)/r/n；/r/nN/r/n=/r/no/r/no/r/n3.000/r/n經(jīng)計(jì)算得到/r/nN/r/n=/r/n4.082kN，/r/n連墻件軸向力計(jì)算值/r/nN/r/n=/r/n7.082kN/r/nlw/r/nl/r/n

/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)（慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目）/r/n根據(jù)連墻件桿件強(qiáng)度要求，軸向力設(shè)計(jì)值/r/nN/r/nf1/r/n=/r/nAn[f]/r/n根據(jù)連墻件桿件穩(wěn)定性要求，軸向力設(shè)計(jì)值/r/nN/r/nf2/r/n=/r/n?A[f]/r/n其中/r/n?/r/n――/r/n軸心受壓立桿的穩(wěn)定系數(shù)，由長細(xì)比/r/nl/i=120.00/1.6/r/n1/r/n的結(jié)果查表得到/r/n?=0.95；/r/n凈截面面積/r/nAn/r/n=/r/n3.57cm/r/n2/r/n；/r/n毛截面面積/r/nA/r/n=/r/n18.10cm/r/n2/r/n；/r/n[f]/r/n=/r/n205.00N/mm/r/n2/r/n。/r/n經(jīng)過計(jì)算得到/r/nN/r/nfi/r/n=/r/n73.185kN/r/nN/r/nfi/r/n>N/r/n]/r/n，連墻件的設(shè)計(jì)計(jì)算滿足強(qiáng)度設(shè)計(jì)要求！/r/n經(jīng)過計(jì)算得到/r/nN/r/nf/r/n=/r/n353.071kN/r/nN/r/nf2/r/n>N/r/n]/r/n，連墻件的設(shè)計(jì)計(jì)算滿足穩(wěn)定性設(shè)計(jì)要求！/r/n連墻件采用扣件與墻體連接。/r/n經(jīng)過計(jì)算得到/r/nN/r/n1/r/n=7.082kN/r/n小于扣件的抗滑力/r/n8.0kN，/r/n滿足要求！/r/n水直預(yù)/r/n管管孰鋼鋼件/r/nmm./r/n水直預(yù)/r/n管管孰鋼鋼件/r/nmm./r/n統(tǒng)絃扣/r/n50/r/nA7I-A7I-/r/n匚」向平角留/r/n連墻件扣件連接示意圖/r/n九、立桿的地基承載力計(jì)算:/r/n中建三局集團(tuán)有限公司/r/n中建三局集團(tuán)有限公司/r/n上人馬道施工方案》/r/n第/r/n上人馬道施工方案》/r/n第/r/n24/r/n頁共/r/n24/r/n頁/r/n慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓等/r/n4/r/n項(xiàng)(慈云寺危改小區(qū)二期/r/n6/r/n號(hào)樓項(xiàng)目)/r/n立桿基礎(chǔ)底面的平均壓力應(yīng)滿足下式的要求/r/np/r/nk/r/nWf/r/n

/r/nkg/r/n其中/r/np/r/nk/r/n——/r/n腳手架立桿基礎(chǔ)底面處的平均壓力標(biāo)準(zhǔn)值，/r/np/r/nk/r/n=N/r/nk/r/n/A=73.52/r/nk/r/nkk/r/n(kPa)/r/nN/r/nk/r/n——/r/n上部結(jié)構(gòu)傳至基礎(chǔ)頂面的軸向力標(biāo)準(zhǔn)值/r/nN/r/nk/r/n=/r/nkk/r/n6.86+11.52=18.38kN/r/nA——/r/n基礎(chǔ)底面面積/r/n