How to inspect the driving guide rails after installation

I think to check the railway tracks, one should focus on the following aspects: 1. Check the levelness. I’ve seen the technical supervision agency inspect tracks by using instruments to measure the vertical height of each point on the track from the ground (of course, this requires the ground to be level), both for the same track and for different tracks as well. I forgot what the allowable range is. 2. Check the parallelism; I think it’s easy to check – just use a ruler to measure. Generally, the requirements for cranes aren’t that strict. 3. Fix. That is, whether the support of the track meets the requirements. 4. Ladders, maintenance platforms (these are generally required for cranes, but not necessary for electric hoists), etc. 5. Whether the limit positions are reasonable, etc

Everything mentioned above are items that must be checked. My problem now is that the two guide rails are located at a height of 18 meters above the ground, with a distance of 26 meters between them. How can I determine the relative parallelism of these two rails as well as their spacing? What are the specific steps to take on-site?

Follow. . . I have the same question; the construction crane is about to be installed.

An infrared distance meter can be used, but make sure the reference surface on the ground is relatively level. I just saw that the Technical Supervision Bureau conducts inspections in this way. I’m not sure if it’s feasible.

Is what was said upstairs referring to the use of a total station? Well, it is possible to measure distances; let’s give it a try during on-site inspection

The common methods for inspection include the following: 1. The elevation measurement method using a theodolite, which is used to check whether the bottoms of the two tracks are level. When installing tracks, strict requirements are placed on the elevation of the I-beams forming the track bottoms, primarily to prevent the hoist from tilting as it moves along them. Therefore, a theodolite can be used to measure whether the bottom surfaces of the two tracks are at the same elevation. If the span between the two tracks is not very large, a U-shaped horizontal tube can be used for measurement. The fact that the water columns are on the same plane indicates that the tracks are at the same elevation. I do not recommend using a tape measure for inspections, as tracks are usually quite tall, and the measuring tools used are typically steel tapes. The steel ruler itself has elasticity, and the degree of tightness is controlled manually, resulting in a lack of accuracy. Furthermore, due to the large distance, it is impossible for the pull to be vertical; a slight tilt will result in a significant difference. 2. Check the distance between the two tracks. The spacing between the tracks is generally checked with a steel ruler. Draw a few more points along the entire length of the track. The data for a few points ensures that it remains within 5 mm, so there are no issues with track operation. 3. Inspection of track curvature and camber; curvature usually occurs at the joints of I-beams, and it can generally be detected by checking the spacing between them. The camber of the arch can generally be checked by using a theodolite to mark points. 4. Inspection of the vehicle barrier. There are generally two types of vehicle stops: one type is installed beneath the I-beam, and the other is installed inside it. Nowadays, the hoists manufactured by most manufacturers come equipped with rubber blocks, so there is no need to install separate rubber blocks. It is sufficient to ensure the weld height of the welded angle steel and the dimension from it to the head of the I-beam.