There are many precautions for cable marker post construction, such as: preparation -- inspection and correction of relevant instruments -- surveying and setting out -- fixed pile delivery -- planning route -- adjusting pile delivery -- recording relevant information after completion. Now let's talk about its construction preparation.

1. Check the complete construction drawings of the study setting out area in detail.

2. Prepare the forms required for the pile delivery record in advance and know the pile receiving personnel to facilitate communication.

3. Prepare qualified measuring instruments, stakes, markers, lime and other tools.

4. The tools to be used for surveying and setting out shall be corrected, and it is also necessary to ensure that these tools are within the specified validity.

Attention shall be paid to the operation of marker posts:

1. The datum point of surveying and setting out must be positioned by GPS, among which the datum point of setting out refers to the design control pile and leveling pile.

2. The control pile must be set according to the operation requirements of the drawings, and the pile number, mileage, ground elevation, corner height and other data must be indicated.

3. The underground obstacles shall be indicated on the location survey data and plane or section drawings. Secondly, the control range on both sides of the intersection of the line and underground structures shall be 3 meters. At the same time, warning signs and marker posts shall be set up. Relevant data shall be written on the marker post. For example: buried depth, cross size, etc.

4. In terms of scribing, a rope shall be drawn between the axis and the boundary of the marker post, and white lime shall be sprinkled for scribing. Finish marking and clear the obstacles on site.

5. In terms of pile moving, all the required line pipe piles shall be moved to the side of the soil pile after the completion of the lineation and before the cleaning, and the range shall be controlled within 0.3m.

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