The severe leakage around the blind corner of the elevator shaft is due to the initial application of a waterproofing layer on the bottom slab, followed by the casting of the side wall concrete. This method results in a separation between the elevator shaft's side wall concrete and the bottom slab, causing the original construction's waterproofing layer to fail in its intended function. Consequently, groundwater continually leaks into the elevator shaft through the crack.

During the civil construction, a significant amount of water accumulated at the bottom plate was not properly drained, and concrete was directly poured into the water, resulting in numerous honeycomb, rough surfaces, holes, and loose areas around the bottom plate. The junction with the bottom plate was not sealed properly, and the elevator shaft bottom was located 3 meters below the level of the positive and negative zero water levels. Due to the high groundwater pressure, water seeped through the holes, rough surfaces, cracks, and loose areas into the bottom pit, causing water accumulation in the elevator shaft.

The cause of leakage in elevator shaft walls: The elevator shaft walls (referring to the side walls below the level of zero elevation to the surrounding area of the pit bottom) were plastered with cement mortar in two stages. Both the interior and exterior of the elevator shaft walls were not treated for waterproofing, leading to groundwater渗透 through the outer wall of the shaft walls, causing water accumulation in the elevator shaft.

Construction Method

In response to the above leakage causes, our company has adopted the construction method of "one blocking, two sealing, and three reinforcement," effectively curing the leakage problems in elevator shafts, floor slabs, and side walls.

A leaky section of the existing wall will first be sealed using either mechanical grouting or manual sealing techniques to stop the leakage, ensuring it no longer渗漏.

The second seal involves applying a waterproof coating as a treatment on top of the repaired leak.

The "three reinforcement" refers to the multiple coatings of waterproof paint, particularly reinforcing treatment at the阴阳 corners and areas that have previously leaked.

Through the comprehensive treatment of multiple waterproofing measures, leakage in elevator shafts can be ensured to be moisture-free.