Shanghai strong foundation underground diaphragm wall guide wall construction method: before the underground diaphragm wall into the trough, should be built guide wall. The guide wall is carefully constructed. The quality of the guide wall directly affects the edge and elevation of the underground continuous wall. It is an important measure to guide the trough equipment, store the mud to stabilize the liquid level, maintain the stability of the upper soil and prevent the soil from slumping.

1, measuring lofting: according to the underground diaphragm wall axis to determine the guide wall excavation position; After the completion of the measurement and setting out, the owner shall be requested to review;

2Soil 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;

3Set up molds and poured concrete: Before binding steel bars, set out the pile position of the middle line of the guide wall by using the total station again, and then set up the steel bars and molds. After the molds are completed, the owner unit and the supervision unit shall check and verify.

4Remove mold and add 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;

5Backfill soil: after the guide wall is removed and supported, the backfill clay should be layered and compacted behind the guide wall immediately;

6Construction 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;

7Guide 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.

8Guide 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 line1.5mThe location of the); At the same time, measure the elevation of each wall top and mark it on the construction drawing for reference.

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