Ideally the same stringline and/or machine guidance system would be used for fine grading operations, placing the asphalt base courses, and pouring the concrete pavement. Care should be taken to ensure the string line does not have any sags and is tight.

3. This SOP applies to all string trimmers and brush cutters including models equipped alternately with string heads and brush blades. 4. Supervisors shall verify that operators are trained and qualified on each type of equipment before allowing the equipment to be operated. 5.

Jul 16, 2020 · Davidson County Bridge 89 on the Lexington Bypass, built in 1950. Five parallel steel I-beams with transverse diaphragms support a reinforced concrete deck (source: NCDOT bridge inspection files).

A string line or 10-foot straightedge shall be used to check the forms for straightness requirements. After forms are set, they shall be checked for alignment and grade according to the stakes previously established for this work.

It is a requirement of this article of the Specifications that a string line be placed by the Contractor and used as a guide for application equipment unless otherwise permitted by the Engineer. The nozzles of the spray bar should be kept clean and properly adjusted at all times.

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It is necessary that string lines, straightedges, etc., be used to properly adjust and orient these items so they will meet the surface requirements of the paved surface. When the lid of a manhole is more than 1/8 inch depressed into an existing ring, the local utility owner should be contacted to secure a replacement manhole ring and cover.

The record of subgrade elevation may be made either by utilizing the blue tops and a string line or with a level and should be recorded in accordance with the Records and Reports Section of this Manual.

This Equipment Training Guide will provide the trainee with information needed to understand the operations, care and safety concerns for the Power Head String Trimmer. The following topics will be covered: Safety, Equipment Maintenance, Terms and Definitions, and Operations.

The milling machine must be equipped with an electronic control system which will automatically control the longitudinal profile and cross slope of the milled pavement surface through the use of either a mobile grade reference(s), an erected string line(s), joint matching shoe(s), slope control systems, or other methods or combination of ...