csmConstruction guide wall method
Measuring lofting: according to the underground diaphragm wall axis to determine the location of the guide wall excavation; After the completion of measurement setting out, please check the general contractor;
Excavation: After measuring and setting out, sprinkle white gray line, and excavate guide wall by combining mechanical excavation and manual dressing. The excavation elevation is controlled by manual dressing;
Formwork and concrete pouring: Before binding steel bars, use the total station again to set out the pile position of the middle line of the guide wall, and then bind the steel bars and formwork. After the formwork is completed, the general contractor and supervision unit shall check it.
Mold removal and support: concrete can be removed after reaching a certain strength, at the same time, the inner wall layer support, prevent the guide wall to squeeze inward, square wood horizontal spacing2m, the upper and lower spacing is1.0m;
Backfill soil: after the guide wall is removed and supported, the backfill clay should be layered behind the guide wall and compacted immediately;
Construction joints: guide wall construction joints should be chiseled, increase reinforcement insertion, make the guide wall as a whole, to achieve the purpose of no water seepage, construction joints should be staggered with underground continuous wall joints;
Guide wall maintenance: guide wall made after natural maintenance70%When the design strength is above, the slotting operation can be carried out. Before that, heavy machinery such as vehicles and cranes are prohibited from approaching the guide wall.
Guide wall framing: Immediately after the construction of the guide wall, draw a framing line on the top surface of the guide wall, and mark the number of the unit slot with red paint(Distance to the framing line1.5m); At the same time, measure the elevation of each wall top and mark it on the construction drawing for reference.
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