In a waterproof pit, which of the following cannot be used?

In a waterproof pit, wall anchors are not suitable because they typically require penetration through the waterproof barrier to be secured, which compromises the integrity of the waterproofing. Wall anchors are often used in applications where structural support or stabilization is needed, but they can create points of potential leakage in a waterproof environment.

On the other hand, anchor bolts, poured concrete, and steel reinforcements can be designed and installed in a way that maintains the waterproof characteristics of the pit. Anchor bolts can be coated or sealed properly to prevent water ingress, poured concrete is inherently solid and can be mixed with additives to enhance waterproofing, and steel reinforcements can be integrated into the concrete during the pouring process without compromising waterproofing if done correctly.