山东电缆桥架的连接需确保电气连续性、结构稳定性和线缆保护功能，其连接方式根据桥架类型、规格及安装需求有所不同。以下是常见的连接方法及注意事项：

　　The connection of Shandong cable tray needs to ensure electrical continuity, structural stability, and cable protection function. The connection method varies depending on the type, specifications, and installation requirements of the tray. The following are common connection methods and precautions:

　　一、基本连接方式

　　1、 Basic connection method

　　1. 直线段连接（直接连接）

　　1. Straight line segment connection (direct connection)

　　适用场景：同规格、同型号桥架的直线延长连接。

　　Applicable scenario: Straight extension connection of cable trays of the same specifications and models.

　　连接步骤：

　　Connection steps:

　　使用连接板：在桥架连接处放置与桥架材质匹配的金属连接板（通常为配套配件），连接板覆盖桥架两侧的端头。

　　Use connection plates: Place metal connection plates (usually matching accessories) that match the material of the bridge at the connection point, and cover the ends on both sides of the bridge.

　　螺栓固定：用镀锌螺栓或不锈钢螺栓穿过连接板和桥架的预制螺孔，从桥架内侧向外侧穿入（避免螺栓头刮伤电缆），并拧紧螺母固定。

　　Bolt fixation: Use galvanized bolts or stainless steel bolts to pass through the prefabricated screw holes of the connecting plate and bridge, and insert from the inside to the outside of the bridge (to avoid scratching the cable with the bolt head), and tighten the nut for fixation.

　　跨接接地：若为钢制桥架，需在连接板两侧用编织铜带或镀锌跨接线连接，确保桥架整体接地导通（螺栓连接处需去除绝缘层或涂层）。

　　Cross grounding: If it is a steel bridge frame, braided copper strips or galvanized jumper wires should be used on both sides of the connecting plate to ensure the overall grounding and conductivity of the bridge frame (the insulation layer or coating should be removed at the bolted connection).

　　2. 弯头 / 三通 / 四通连接

　　2. Elbow/tee/four-way connection

　　适用场景：桥架转向（90° 弯头）、分支（三通、四通）时的连接。

　　Applicable scenarios: Connection during bridge turning (90 ° bend) and branching (tee, four-way).

　　连接步骤：

　　Connection steps:

　　配件匹配：选择与桥架规格一致的弯头、三通、四通配件，确保接口尺寸吻合。

　　Accessory matching: Select elbow, tee, and four-way accessories that match the specifications of the bridge, ensuring that the interface dimensions match.

　　螺栓固定：将配件与主桥架的端头对齐，通过连接板和螺栓固定（方式同直线段连接），确保连接处平整无错位。

　　Bolt fixation: Align the accessories with the end of the main bridge frame, and fix them with connecting plates and bolts (in the same way as connecting straight sections) to ensure that the connection is flat and not misaligned.

　　弧度处理：弯头内侧需平滑过渡，避免电缆弯曲时受挤压（电缆弯曲半径需符合规范）。

　　Arc processing: The inner side of the elbow should have a smooth transition to avoid compression when the cable is bent (the bending radius of the cable should comply with the specifications).

　　3. 变径连接（大小头连接）

　　3. Variable diameter connection (size head connection)

　　适用场景：不同规格桥架（如宽度或高度变化）的过渡连接。

　　Applicable scenarios: Transition connections for bridge frames of different specifications (such as width or height variations).

　　连接步骤：

　　Connection steps:

　　使用变径板：采用变径接头（又称 “大小头”），一端与大规格桥架连接，另一端与小规格桥架连接。

　　Using a variable diameter plate: Using a variable diameter joint (also known as a "big small head"), one end is connected to a large-sized bridge and the other end is connected to a small-sized bridge.

　　错位固定：将变径板的两端分别插入主桥架和分支桥架的端头，用螺栓从内侧固定，确保变径处平滑过渡，无尖锐边缘。

　　Misalignment fixation: Insert the two ends of the variable diameter plate into the ends of the main bridge and branch bridge respectively, and fix them from the inside with bolts to ensure a smooth transition at the variable diameter without sharp edges.

　　4. 伸缩缝连接

　　4. Expansion joint connection

　　适用场景：桥架跨越建筑伸缩缝、沉降缝或长距离直线段（需预留热胀冷缩空间）。

　　Applicable scenarios: Bridge spans building expansion joints, settlement joints, or long-distance straight sections (with reserved space for thermal expansion and contraction).

　　连接步骤：

　　Connection steps:

　　预留间隙：在伸缩缝两侧的桥架间预留10~15mm 间隙，避免因建筑结构变形导致桥架受损。

　　Reserved gap: Reserve 10-15mm gap between the bridge frames on both sides of the expansion joint to avoid damage to the bridge frames due to structural deformation of the building.

　　柔性连接：间隙处用金属软连接片（如波纹板）或橡胶伸缩节连接，同时用跨接线确保接地连续性。

　　Flexible connection: Metal flexible connectors (such as corrugated plates) or rubber expansion joints are used to connect gaps, and jumper wires are used to ensure grounding continuity.

　　支架固定：伸缩缝两侧的桥架需单独固定支架，避免桥架整体位移。

　　Bracket fixation: The bridge frames on both sides of the expansion joint need to be separately fixed with brackets to avoid overall displacement of the bridge frames.

　　二、接地与电气连通

　　2、 Grounding and electrical connection

　　跨接接地要求

　　Cross grounding requirements

　　桥架系统需形成完整的接地通路，通常通过连接板的螺栓连接实现电气导通。若螺栓连接处有绝缘涂层（如喷塑桥架），需刮除涂层或使用爪型垫片刺破涂层。

　　The bridge system needs to form a complete grounding path, usually achieved through bolted connections of connecting plates to achieve electrical conductivity. If there is insulation coating at the bolted connection (such as spray painted bridge), it is necessary to scrape off the coating or use claw type washers to puncture the coating.

　　对于长距离桥架（超过 30m），需按规范与接地干线连接（如每隔 30m 接入一次接地系统）。

　　For long-distance cable trays (exceeding 30m), they must be connected to the grounding main line according to regulations (such as connecting the grounding system every 30m).

　　不同材质处理

　　Different material treatments

　　钢制桥架：跨接线可用镀锌圆钢或编织铜带，螺栓连接后需做防腐处理（如涂防锈漆）。

　　Steel bridge frame: Galvanized round steel or braided copper strip can be used for jumper wires, and anti-corrosion treatment (such as coating with anti rust paint) is required after bolt connection.

　　铝合金桥架：需用铝合金跨接件或不锈钢螺栓，避免不同金属接触产生电化学腐蚀。

　　Aluminum alloy bridge frame: Aluminum alloy jumper fittings or stainless steel bolts are required to avoid electrochemical corrosion caused by contact between different metals.

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