電纜橋架支架的標準

電纜橋架支架的標準1支吊架設(shè)計依據(jù)1.1《建筑工程施工質(zhì)量統(tǒng)一驗收標準規(guī)范》GB50300—20131.2《建筑電氣安裝工程施工及驗收規(guī)范》GB50303—20021.3國家建筑標準設(shè)計圖集《室內(nèi)管道支架和吊架》03S4021.4國家建筑標準設(shè)計圖集《電纜橋架安裝》04D701—32橋架支吊架計算過程支吊架的設(shè)計過程中主要考慮一下幾種荷載：垂直荷載、水平荷載。支吊架計算成果主要包括支吊架的間距計算、支吊架橫桿計算、支吊架吊桿計算；其中，單根各種規(guī)格橋架支吊架橫桿及支吊架吊桿見下表：支吊架規(guī)格及支架吊桿對應(yīng)表序號橋架規(guī)格支架/吊桿寬mm高mm500730800100012001300140015001600型鋼選型支架吊桿支架吊桿支架吊桿支架吊桿支架吊桿支架吊桿支架吊桿支架吊桿支架吊桿1100500.360.450.360.360.360.720.360.900.361.090.361.180.361.270.361.360.361.45∟40*40*4/φ1021001000.360.450.360.660.360.720.360.900.361.090.361.180.361.270.361.360.361.45∟40*40*4/φ1031501000.440.450.440.660.440.720.440.900.441.090.441.180.441.270.441.360.441.45∟40*40*4/φ1042001000.530.450.530.660.530.720.530.900.531.090.531.180.531.270.531.360.531.45∟40*40*4/φ1053001000.650.650.650.950.651.040.651.300.651.560.651.690.651.820.651.950.652.08∟40*40*4/φ1263001500.710.650.710.950.711.040.711.300.711.560.711.690.711.820.711.950.712.08∟40*40*4/φ1274001000.810.650.810.950.811.040.811.300.811.560.811.690.811.820.811.950.812.08∟40*40*4/φ1284001500.890.650.890.950.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ1294002000.890.650.890.860.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ12105001000.890.650.890.950.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ12116001001.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12126001501.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12136002001.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12148001002.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*4158001502.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*4168002002.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*41710001003.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*41810001503.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*41910002003.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*42012001003.591.783.592.593.592.843.593.553.594.263.594.623.594.973.594.623.595.68∟50*50*5/∟40*40*42112001503.951.783.952.593.952.843.953.553.954.263.954.623.954.973.954.623.955.68∟50*50*5/∟40*40*42212002003.951.783.952.593.952.843.953.553.954.263.954.623.954.973.954.623.955.68∟50*50*5/∟40*40*42.1支吊架間距間距系指管道的跨度，一般管道的最大支吊架間距是按強度條件和剛度（或撓度）條件計算決定。在兩者中，選擇其數(shù)值小的作為管道的最大間距值；按剛度條件水平管道支吊架最大允許間距EQL=\f(1,10)\r(,\f(EI△,W))=\f(1,10)\r(,\f(198*96.68*15,8.385*10))=5.852m按強度條件水平管道支吊架最大允許間距EQL=\r(,\f(Z[σ],W))=\r(,\f(21.73*110,8.385*10))=5.339m式中：L—水平管道支吊架的間距（單位：m）；E—管材在熱態(tài)下的彈性模量（單位：kN/mm2）：取值196~206，取值198kN/mm2；I—管材的截面慣性矩（單位：cm4）；W—管材的單位長度重量（單位：kN/m）；△—管材在跨中的撓度（單位：mm），一般選用撓度在10~20mm之間選??；15Z—管材的截面模量（單位：cm3）；?—熱態(tài)下鋼管受到重力荷載部分的許用應(yīng)力（單位：MPa）；2.2吊桿計算吊桿按軸心受位構(gòu)件計算，并考慮一定的腐蝕余量，按照下式計算，滿足國標GB/T17116.3EQAn≥\f(1.5*N,0.85f)=\f(1.5*(8.385)*9.8,0.85)=145.011=>10式中：An—吊桿截面面積（單位：mm2）；N—吊桿拉力設(shè)計值（N）；f—鋼材強度設(shè)計值（N/mm2）；吊桿使用最大荷載吊桿直徑101216202430拉力允許值3250472590001400020000325002.3橫梁計算橫梁計算主要是承受和管道的荷載，故其受力形式為彎剪受力，分別計算其受彎和受剪應(yīng)力，然后確定橫梁是否滿足受力要求。彎曲應(yīng)力計算式中γx、γy—截面塑性發(fā)展系數(shù)：對于普通碳素結(jié)構(gòu)鋼，一般取值：1.05；Mx、My—所驗算截面繞x軸和繞y軸的彎矩（N*mm）；Wx、Wy—截面對x軸和對y軸的凈截面抵抗矩（mm3）；f—鋼材強度設(shè)計值（N/mm2）（2）剪應(yīng)力計算式中t—抗剪強度（N/mm2）；V—計算截面沿腹板平面作用的剪力；S—計算剪力處以上毛截面最中州的面積矩（mm3）;Ix—截面慣性矩（mm4）；Tw—腹板厚度（mm）