梯級(jí)式橋架選用注意事項(xiàng)

Notices for Selection of Cascade Bridge Frame

梯級(jí)式電纜橋架具有分量輕，構(gòu)造簡(jiǎn)單，本錢(qián)低，強(qiáng)度大，造型別具，設(shè)備便當(dāng)、散熱、透氣性好等優(yōu)點(diǎn)，運(yùn)用小量化的銜接螺栓，它適用于普通直徑較大電纜的敷設(shè)，特別適用于高、高壓動(dòng)力電纜的敷設(shè)。梯級(jí)式電纜橋架備有護(hù)罩，需求配護(hù)罩時(shí)可在訂購(gòu)時(shí)注明，其一切配件與托盤(pán)式、槽式橋架通用。

The cascade cable bridge has the advantages of light weight, simple structure, low cost, high strength, unique shape, convenient equipment, heat dissipation and good air permeability. It is suitable for laying ordinary large diameter cables, especially for laying high and high voltage power cables by using minimum quantified connecting bolts. The cascade cable bridge frame is equipped with protective cover, which can be indicated when ordering. All its accessories are common with tray and trough bridge frames.

1.橋架、線槽及其支吊架運(yùn)用在有腐蝕性環(huán)境中，應(yīng)選用耐腐蝕的剛性材料制造，或采用防腐蝕處置，防腐蝕處置方式應(yīng)稱(chēng)心工程環(huán)境和耐久性的要求。

1. Bridges, troughs and their supports and hangers should be made of rigid corrosion-resistant materials in corrosive environments, or be treated with corrosion protection, which should satisfy the requirements of engineering environment and durability.

2.橋架在有防火要求的區(qū)段內(nèi)，可在電纜梯架、托盤(pán)內(nèi)添加具有耐火或難燃功用的板、網(wǎng)等材料構(gòu)成封閉或半封閉式構(gòu)造，并采用在橋架及其支吊架表面涂刷防火涂層等方法，其全體耐火功用應(yīng)稱(chēng)心國(guó)度有關(guān)標(biāo)準(zhǔn)或標(biāo)準(zhǔn)的要求。

2. In the section with fire-proof requirements, the bridge frame can be constructed by adding fire-proof or flame-proof plates, nets and other materials to the cable ladder and tray to form a closed or semi-closed structure. The bridge frame and its supporting suspension surface can be coated with fire-proof coatings, etc. The fire-proof functions of the bridge frame and its supporting suspension should be satisfied with the requirements of relevant national standards or standards.

3.在工程防火要求較高的場(chǎng)所，不宜選用鋁合金橋架。

3. Aluminum alloy bridge should not be used in places with high fire protection requirements.

4.電纜梯架寬度和高度的挑選應(yīng)契合填充率的要求，電纜的梯架的填充率在普通狀況下，電力電纜可取40%～50%，操控電纜可取50%～70%，且宜預(yù)留10%～25%工程展開(kāi)裕量。

4. The selection of cable ladder width and height should meet the requirement of filling rate. Under normal conditions, the filling rate of cable ladder can be 40%-50% for power cable, 50%-70% for control cable, and 10%-25% for engineering development margin should be reserved.

5.在挑選電纜梯架的荷載等級(jí)時(shí)，橋架的作業(yè)均布荷載不該大于所選橋架荷載等級(jí)的額定均布荷載，假設(shè)橋架的支吊架的理論跨距不等于2m時(shí)，則作業(yè)均布荷載應(yīng)稱(chēng)心要求。

5. When selecting the load grade of cable ladder, the operating uniform load of the bridge should not be greater than the rated uniform load of the selected bridge load grade. Assuming that the theoretical span of the suspension of the bridge is not equal to 2 m, the operating uniform load should be satisfied.

6.各種組件及支吊架在稱(chēng)心相應(yīng)荷載的條件下，其規(guī)范尺度應(yīng)與托盤(pán)、梯架的直線段、彎通系列相婚配

6. All kinds of components and supports and hangers should be matched with trays, straight sections of ladders and bend-through series under the condition of satisfying corresponding loads.

7.在挑選橋架的彎通或引上、引下設(shè)備時(shí)，不該小于橋架內(nèi)電纜小容許迂回半徑。

7. The minimum allowable deviation radius of cables in the bridge should not be less than the minimum allowable deviation radius of cables in the bridge when selecting the bending or leading up or down equipment of the bridge.

8.關(guān)于跨距大于6m的鋼制橋架和跨距大于2m或承載要求大于荷載等級(jí)D級(jí)的鋁合金橋架，應(yīng)按工程條件停止強(qiáng)度、剛度及波動(dòng)性的核算或?qū)嶒?yàn)驗(yàn)證。

8. For steel bridges with spans greater than 6m and aluminium alloy bridges with spans greater than 2m or bearing requirements greater than load grade D, strength, stiffness and fluctuation should be checked and verified according to engineering conditions.

9.幾組橋架在同一高度平行敷設(shè)時(shí)，各相鄰電纜橋架之間應(yīng)思索維護(hù)、檢修距離。

9. When several groups of bridges are laid parallel at the same height, the distance between adjacent cable bridges should be considered for maintenance and repair.

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