Scaffolding under special conditions?

It is very important to work under special conditions. Only by knowing every detail of the work can we solve the problem and reduce the unnecessary influence in actual construction. Zhong Da Consulting will explain to you the work of erecting beams under special conditions.

Beams under special conditions mainly include: beams under special climatic conditions, including beams in winter and beams under storms and dusty weather; Curved beam erection and variable slope beam erection.

A, winter frame beam

1. Clear the snow on the beam path, and clear the snow and ice in the hole of the anchor bolt and the surface of the bearing pad stone. It is forbidden to put the bearing on the cushion stone with thin ice layer.

2. The gravity grouting construction of the gap between the anchor bolt hole, the top surface of the bearing pad stone and the bottom surface of the bearing should comply with the relevant provisions of winter construction, and reliable insulation and anti-freezing measures should be taken.

3. The engine and hydraulic system of beam transport equipment should use diesel oil, lubricating oil and hydraulic oil with the same temperature in winter construction.

The second is windy, rainy, foggy and dusty weather.

1. The girder erection unit shall establish a meteorological information collection center to master the weather conditions and guide the construction.

2. When the maximum wind power level is equal to or greater than 6, it is not advisable to erect beams. Specific requirements shall be implemented in accordance with the instructions of the bridge erecting machine.

3. When erecting beams in the wind, operators must have reliable safety facilities. There should be a fence on the top of the pier and a safety net around it.

4. When erecting beams in the wind, it is necessary to distinguish the specific circumstances such as downwind, crosswind, frequent or intermittent wind, and choose to hang beams and drop beams when the wind is small or downwind.

5. In rainy days, people should be sent to check the subgrade, culvert and bridge for diseases before transporting and erecting beams, and reinforce or correct them.

6. In rainy days, the inspection and protection of electrical lines and equipment should be strengthened to avoid leakage and electrical short circuit faults.

7. Fog and dusty weather can easily affect the line of sight. At this time, beam erection should be avoided, and only preparatory work is allowed.

Three. Erection of curve section and variable slope section

1. Find the timing before erecting the bridge erecting machine, and the guiding beam of the bridge erecting machine shall be consistent with the axis of the straight bridge.

2. According to the curve radius of frame curved bridge, calculate the chord length of the radius between piers.

3. Adjust the front leg, and move the oil cylinder horizontally, so that the guide beam is consistent with the center line of the curve section axis.

4. The girder is transported by the girder transport vehicle, and the erection steps of the bridge erecting machine are the same as those of the straight girder erection.

5. When erecting the beam with variable slope, adjust the height of the outrigger of the bridge-erecting machine 1 through the oil cylinder, and adjust the top (or slightly higher front end) of the main truss horizontally as far as possible according to the requirements of the manual, and the height difference of the main truss at the adjacent outriggers shall not be greater than 50 mm ..

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