Measuring lofting, according to the

Measuring lofting, according to the design drawings accurately release side ditch plane position, elevation, according to the lofting pile point release side ditch foundation pit position, lime line after using mechanical excavation to the side ditch base elevation, such as overbreak should use permeable material stratified backfill, and mechanical compaction. After the blind ditch foundation pit is completed, please ask the supervision engineer for acceptance, and the bottom of the side ditch will be built once it is qualified. Before laying the side ditch, the sample frame shall be customized with wood according to the style, shape and size of the side ditch. The side ditch shall be provided with a settlement joint every 10 ~ 20m, and the sample frame shall be placed in the settlement joint. Then the sample frame shall be laid by pulling wires. The mortar shall be mixed on site by machinery according to the test mix ratio to control the water cement ratio. According to the height of the masonry, select the materials and install them from the settlement joint position. First, install the corner stone and then install the facing stone in sequence. The facing stone shall be laid in a one-to-one and one-to-one way, and the belly stone can only be filled after the outer ring positioning row and column stones are laid. When filling abdominal stones, grout shall be laid at the bottom of the circle first, then stones shall be selected for trial placement, with the large surface of larger stones as the bottom, and the wider joints shall be filled with small stones. After trial placement, use small hammer to hammer the stone and squeeze the mortar. squeeze the mortar tightly without leaving any pores.