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The Case of Elevator Well Leaking Construction

Leakage in elevator shafts is a relatively common phenomenon. Causes of leakage in elevator shaft

1. The elevator shaft wall is plastered twice with cement mortar.

No waterproof treatment was performed inside and outside of the sidewall of the elevator shaft, which could cause the groundwater to permeate into the borehole wall and thus lead to appear plenty of water here.

2. The reason for serious leakage around the inside corner of the lift shaft: Because waterproof work was done in the floor first,

and then poured the cast-in-situ concrete wall, which could cause the concrete wall of the elevator shaft not to connected with the

floor. The original construction waterproof layer did not have a necessary waterproof effect, so that the groundwater would

continuously seep from the fault into the elevator shaft.

3. During civil engineering work, before a large amount of accumulated water in the floor is drained, the concrete was directly

poured into the water, resulting in a lot of honeycomb-like hollows, pits and holes around the floor. The floor becomes

unconsolidated. The connection with the floor is not closed completely. The bottom position of the elevator shaft lies in the

positive and negative water level lines. The groundwater pressure is relatively large, and groundwater seeps through the holes,

pits, cracks and loose parts to the pit, resulting in water accumulation in the elevator shaft.

First clean up the debris inside the elevator shaft to ensure the quality and safety during the construction.

Adopt the construction method of “to stop leakage first, then seal, and finally reinforce”, and root out the

seepage problem of the floor and side walls in the elevator shaft. The first step is to plug, that is to say, the

existing leaking part is stopped by mechanical grouting so that it will not leak. (Recommended to use Shenglong Building Materials Water-based Polyurethane, which reacts with water with high water retention rate and make

do your work if there is water there)

The second is to seal, that is to use waterproof paint for comprehensive waterproof treatment on the condition

that the leakage has been stopped.

The third step is to reinforce. That is to intensify the treatment by repeatedly applying waterproof paint to these places especially in the corners and the places where the water has leaked. After this three steps, it is not

necessary to worry about the leakage again.

Acceptance Criteria

1. The type, quality, performance and design requirements of the materials used and the performance

indicators specified in this regulation.

2. Waterproof, and structural layers must be firmly bonded, no delamination, hollowing and cracks.

3. The surface is smooth, clean, seamless. It's

straight, clear and has uniform molding hair

texture .

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