The metal air duct is made of steel plate and the flange is made of profiled steel. When prefabricating, attention should be paid to whether the wrong material can be used. A section should be left at the connection of the variable-diameter accessories (such as tuyeres) and the blanking should be made and installed according to the actual size. Avoid rework, flange fabrication should be done in pairs to avoid bolt holes uneven in future installation.

　　1.1根據(jù)風(fēng)管的尺寸，選擇不同的板材厚度，然后留足咬口余量、進行下料。

　　1.1 According to the size of air duct, choose different thickness of sheet, and then leave enough bite allowance for blanking.

　　1.2劃線方法要嚴密，做到角直、線平、等分準(zhǔn)確、經(jīng)常檢驗結(jié)合尺寸，達到交圈嚴格、尺寸正確的目的。

　　1.2 The method of marking should be strict, so that the angle, line level, equal parts are accurate, and the combined size is checked regularly, so as to achieve the purpose of strict intersection and correct size.

　　1.3剪切、倒角要正確，盡量減少誤差，操作時避免接縫、翻邊處重疊。

　　1.3 Shearing and chamfering should be correct to minimize errors and avoid overlapping of seams and flanges during operation.

　　1.4制作風(fēng)管及部件時盡量采用咬口連接，因為咬口縫可以增加風(fēng)管的強度。

　　1.4 When making air ducts and components, try to use bite joints, because bite joints can increase the strength of air ducts.

　　1.5根據(jù)不同的板材厚度選擇咬口的寬度和留量，咬口操作時，避免咬口不實，造成脹裂及半咬口現(xiàn)象。

　　1.5 Choose the width and retention of the bite according to the thickness of the plate. When the bite is operated, the false bite is avoided, resulting in swelling and half bite.

　　1.6當(dāng)風(fēng)管邊長過大，其管段在1.2米以上時應(yīng)采取加固措施視具體情況采用角鋼框加固、角鋼加固大邊，內(nèi)壁設(shè)置加固肋條的辦法加固。

　　1.6 When the side of the air duct is too long and the pipe section is over 1.2 meters, reinforcement measures should be taken to reinforce the large side with angle steel frame, angle steel and ribs on the inner wall.

　　1.7法蘭選用角鋼法蘭組焊。切斷時用型鋼切割機加工，在鉆床上鉆孔后，放在焊接平臺上焊接，以保證平直度。

　　1.7 Angle steel flange is selected for group welding. Section steel cutting machine is used for cutting. After drilling on the drilling machine, it is welded on the welding platform to ensure flatness.

　　1.8預(yù)制時將相鄰風(fēng)管進行編號，增加功效并減少施工過程中的返工。

　　1.8 When prefabricating, the adjacent air ducts will be numbered to increase efficiency and reduce rework during construction.

　　1.9風(fēng)管的規(guī)格，尺寸應(yīng)符合設(shè)計要求，當(dāng)外觀質(zhì)量達到折角平直、圓弧均勻，兩端平行、無翹角，風(fēng)管與法蘭連接牢固翻邊平整并緊貼法蘭。風(fēng)管加固牢靠、整齊，間距適宜，均勻?qū)ΨQ。

　　1.9 The specifications and dimensions of air ducts shall meet the design requirements. When the appearance quality reaches the level of folding angle, uniform arc, parallel ends and no warping angle, the air ducts and flanges are firmly flanged and flat and close to flanges. The air duct reinforcement is reliable, neat, spacing is appropriate, uniform and symmetrical.

　　2在安裝風(fēng)管前，障礙物已清理，地面無雜物的條件下進行施工。

　　2. Before installation of air duct, obstacles have been cleared and construction is carried out under the condition of no debris on the ground.

　　3檢查現(xiàn)場結(jié)構(gòu)預(yù)留孔洞的位置、尺寸是否符合圖紙要求，有無遺漏現(xiàn)象，的孔洞應(yīng)比風(fēng)管實際尺寸每邊大于100MM。

　　3. Check whether the location and size of the reserved holes in the field structure conform to the requirements of the drawings and whether there are any omissions. The remaining holes should be larger than 100MM on each side of the actual size of the duct.

　　4作業(yè)地點要由相應(yīng)的輔助設(shè)施，如梯子電源和防護裝置消防器材等。

　　4. Operating sites shall be provided with corresponding auxiliary facilities, such as ladder power supply and fire fighting equipment of safety protection devices.