Span measurement method of bridge crane and gantry crane

The measurement of crane span is also the measurement of crane track distance. Crane track span measurement is a very important step before the production and installation of cranes. Once the crane span measurement is wrong, the crane cannot be installed and used, and it needs to be modified twice. Therefore, the span measurement of the crane is very important, so how to measure the span of the crane track, I will give you a detailed introduction today.

Crane span measurement

1. The span measurement conditions of general bridge (gantry) cranes should meet the following requirements:

1.1. The span measurement of indoor bridge gantry crane should be placed horizontally;

1.2. The span measurement of outdoor single and double beam cranes should be placed horizontally and measured under no wind conditions;

1.2. When measuring the span of the crane, the temperature of the steel tape measure and the crane track should be the same, and the steel tape measure must not swing and sag naturally;

1.3. The steel tape should be qualified by the provincial level-approved metrology department and within the validity period;

1.4. The span of the crane cannot be calculated and must be actually measured;

Electric single beam crane

2. The span deviation △S of the gantry crane shall be calculated as follows:

△S =S side+△1+△2-S (Append 1.1)

In the formula: S side——measured value of span (mm);

S——theoretical value of span (mm);

△1——Measurement correction value of steel tape (mm);

△2——The correction value of steel tape (mm), which can be taken according to the attached table 1.1 or the attached table 1.2;

Suspension and Overhead Cranes

3. The location of crane span measurement should be determined according to attached drawings 1.1 to 1.4.

Gantry crane

1. The calculated correction value of the steel tape is provided by the measurement department (positive or negative). The following picture shows the track span measurement of bridge crane , double beam crane track span measurement, gantry crane track span measurement, large loading and unloading bridge track span measurement, suspension crane Track span measurement.

Overhead Crane Track and Gantry Crane Track

Suspended Crane Track

2. The deviation △S0 of the crane track span should be calculated as follows:

△S0 =S0 test +△1+△2+△3-S0 (Append 1.2)

In the formula: △S0——measured value of track span (mm);

△1——Measurement correction value of steel tape (mm);

△2——Correction value of steel tape (mm), take the value according to attached table 1.1 or attached table 1.2;

Correction value of steel tape when measuring overhead crane

△3——Temperature correction value (mm). The temperature correction value is calculated as follows:

△3=αS0(t-20) (attached 1.3)

In the formula: α——The coefficient of linear expansion of steel tape is 11.5×10-6/℃;

t——The actual temperature during measurement (℃);

S0——theoretical value of crane track span (m).

Diagram of correction value of steel tape when measuring single and double beam bridge gantry crane

6. The location of crane track span measurement should be determined according to attached drawings 1.5 to 1.8.

The span measurement of the crane should be as accurate as possible to reduce errors and avoid the inaccuracy of the measurement, which may cause normal installation and use. If you have any questions or needs, you can contact us by Email: sales010@cranesdq.com

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