How is the construction of the Bailey beam bracket carried out? How is grounding and maintenance performed?

How is the Bailey beam support constructed? How to ground and maintain it? The construction steps for the Bailey beam support are as follows:

1. Before assembling the Bailey beam support, the nose frame should be installed first. The installation method is as follows: First, assemble the Bailey truss on the rock at the edge of the push-out shore, with one end of the truss resting on the rock and the other end on a temporary wooden pad.

2. The male and female ends of the truss boards should be consistent. A crossbeam should be placed behind the front vertical rod. The two rows of holes at the bottom of the beam should be bolted onto the lower chord of the two truss boards, and clamped with beam clamps. Do not tighten yet. After installation, tighten the diagonal braces on the crossbeam.

3. Install the second truss. At the same time, the Bailey beam support should install diagonal braces on the first truss beam, and the crossbeam should be installed behind the vertical rod at the front end of the second truss. Lightly clamp with beam clamps, do not tighten yet. After installing the supports on the crossbeam, tighten again.

4. Install three trusses, install wind-resistant rods on the first truss board, and install diagonal braces on the second truss board beam. The head frame should be installed in order, and four truss boards should be fitted into the head frame.

5. The bridge is towed by a winch. During the towing process, unified command, coordinated efforts, and teamwork should be ensured. Continuously check the operation of the rollers and the bridge. If any issues are found, operations should be stopped immediately, and further promotion should only occur after the problems are resolved.

6. After pushing the bridge frame into position, remove the nose frame, support the lower chord of the bridge frame with a jack, and settle it down. Check the Bailey beam support, and tighten all supports, beam clamps, and wind-resistant rods.

7. Lay longitudinal beams, bridge deck, steel plates, etc.

The grounding of the Bailey beam support should pay attention to the following four points:

1. The bridge frame system should have a reliable electrical connection, and if it is a metal bridge frame, it will be grounded.

2. When using a bridge-type system to form a grounding main circuit, the connection resistance at the bridge end should be less than or equal to 0.00033 ohms, and the insulation coating on the grounding hole should be removed. In a direct grounding system with a neutral point of 1KV and below, the grounding of the powered equipment should be connected to the grounding of the system's neutral line. When installing with the power cut off, the metal cross-sectional area in the length direction of the bridge frame should not exceed the specified value.

3. Additionally, when laying grounding wires along the entire bridge, each bridge should have at least one reliable connection to the grounding wire.

4. Spring coils should be installed at the grounding connections in vibrating environments.

When using the Bailey beam support, we should maintain it as follows:

1. Observe whether all pins, bolts, beam clamps, and wind-resistant rods of the Bailey beam support are fully assembled, whether there is any human damage or looseness, to ensure safe passage.

2. Regularly check the bridge foundation of the Bailey beam support for uneven settlement, and address any issues promptly. 3. Apply grease around the pins to prevent rainwater from entering the pin hole gaps, and apply grease to the exposed threads of all bolts to prevent rust.

4. Regularly measure the mid-span deflection of the bridge to see if it has increased. The rate of deflection increase should be consistent with the wear of the pins and pin holes.

5. Check if the bridge deck is cracked, deformed, or uneven, and replace if necessary.