The application of cable bridge in our country has only been more than ten years, and in developed countries in Europe and America, it is only a few decades. In a computer room project, compared with expensive and high-tech hardware and software, the bridge is not obvious and seldom paid attention to, but it is also an indispensable part of the whole wiring project. The following is introduced to you by Jinan Cable Bridge Company: the selection principle of cable bridge, I hope to be helpful to you all!

一、電纜橋架型式及品種的選擇

Selection of Types and Varieties of Cable Bridge Frames

1、需屏蔽電氣干擾的電纜網(wǎng)路或有防護(hù)外部（如：有腐蝕液休，易燃粉塵等環(huán)境）影響的要求時，應(yīng)選用（FB）類槽式復(fù)合型防腐屏蔽電纜橋架（帶蓋）強(qiáng)腐蝕性環(huán)境應(yīng)采用（F）類復(fù)合環(huán)氧樹脂防腐阻燃型電纜橋架。托臂、支架也要選用同樣材料，提高橋架及附件的使用壽命，電纜橋架。在容易積灰和其它需遮蓋的環(huán)境或戶外場所宜加蓋板。

1. When cable networks need to shield from electrical interference or the requirements of protecting the external environment (such as corrosive liquid rest, flammable dust, etc.), the (FB) groove type composite anti-corrosion shielded cable bridge (with cover) strong corrosive environment should be selected, and the (F) type composite epoxy resin anti-corrosion and flame-retardant cable bridge should be adopted. Brackets and brackets should also use the same materials to improve the service life of the bridge and accessories, and cable bridge. Covering board should be added to the environment or outdoor places where dust is easily accumulated and other areas need to be covered.

2、在公共通道或戶外跨越道路段，底層梯級的底部宜加墊板或在該段使用托盤。

2. In the public passage or outdoor crossing section, the bottom of the bottom step should be padded or pallets should be used in this section.

3、戶外要選用復(fù)合環(huán)氧樹指橋架（F）。

3. Composite epoxy tree finger bridge (F) should be used outdoors.

4、大跨距（>3m）要選用復(fù)合型橋架（FB）。

4. Composite bridge (FB) should be selected for long span (>3m).

5、除上述情況外，可根據(jù)現(xiàn)場還環(huán)境及技術(shù)要求選用托盤式、槽式、梯級式、玻璃防腐阻燃電纜橋架或鋼質(zhì)普通型橋架。在容易積灰和其它需遮蓋的環(huán)境或戶外場所宜加蓋板。

5. In addition to the above, tray type, trough type, cascade type, glass anti-corrosion and flame-retardant cable bridge or steel ordinary bridge can be selected according to the site environment and technical requirements. Covering board should be added to the environment or outdoor places where dust is easily accumulated and other areas need to be covered.

6、大跨距跨越公共通道時，可根據(jù)用戶要求提高橋架的載荷能力或選用行架。

6. When crossing a public passage with a long span, the load capacity of the bridge frame can be improved or the traveling frame can be selected according to the user's requirements.

二、規(guī)格選擇

II. Specification Selection

1、各種彎通及附件規(guī)格應(yīng)符合工程布置條件并與橋架相配套。

1. All kinds of bending and accessory specifications shall conform to the engineering layout conditions and be matched with the bridge.

2、橋架的寬度和高度就按下表選擇，并應(yīng)符合電纜真充率不超過有關(guān)標(biāo)準(zhǔn)規(guī)范的規(guī)定值，動力電纜可取40-50%，控制電纜可取50-70%，另外需予留10-25%的式程發(fā)展余量。

2. The width and height of the bridge shall be selected according to the table below, and the true charge ratio of the cable shall not exceed the stipulated value of the relevant standards and specifications. The power cable shall be 40-50%, the control cable shall be 50-70%, and the remaining 10-25% of the formula development shall be allowed.

3、支、吊架規(guī)格的選擇，應(yīng)按橋架規(guī)格、層數(shù)、跨距等條件配置。并應(yīng)滿足荷載的要求。

3. The selection of support and hanger specifications should be based on the bridge specifications, layers, spans and other conditions. And it should meet the requirements of load.

4、橋架橫截面積的選擇見表橋架上電纜網(wǎng)絡(luò)中任一線路的大自動過電流保護(hù)的額定電流值或整定值（A）橋架橫截面充許小值(mm2)0-60 12961-100 258101-200 452201-400 645401-600 968

4. Selection of the cross-section area of the bridge can be seen in the rated current value or setting value of the maximum automatic over-current protection for any line in the cable network on the bridge. (A) Allowable minimum value of the cross-section of the bridge (mm2) 0-60 12961-100 258101-200 452201-400 645401-600 968

三、支、吊架的配置

3. Configuration of brackets and hangers

1、戶內(nèi)支、吊短跨距一般采取1.5-3m。戶外立柱中跨距一般采取6m。

1. Short span of indoor branch and suspension is generally 1.5-3 M. The span of outdoor column is usually 6 m.

2、非直線段的支、吊架配置就遵循以下原則。當(dāng)橋架寬度<300mm時，應(yīng)在距非直線段與直線結(jié)合處300-600m的直線段側(cè)設(shè)置一個支、吊架。當(dāng)橋架寬度>300mm時，除符合下述條件外，在非直線段中部還應(yīng)增設(shè)一個支、吊架。

2. The support and hanger configuration of non-linear section follows the following principles. When the width of the bridge is less than 300 mm, a support and hanger should be set on the side of the straight section 300-600 m away from the joint of the non-linear section and the straight line. When the width of the bridge is more than 300 mm, in addition to meeting the following conditions, there should be an additional support and hanger in the middle of the non-linear section.

3、電纜橋架多層設(shè)置時層間中心距為200，250，300，350mm。

3. The center distance between layers is 200,250,300,350 mm when multi-layers of cable bridge are set up.

4、橋架直線段每隔50m應(yīng)予留伸縮縫20-30mm（金屬橋架）。

4. The expansion joint should be 20-30 mm (metal bridge) for the straight section of the bridge every 50 m.

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