Mobile Toilet Sinking Design
Mobile toilet sinking usually refers to the design of a sunken bathroom, where the core is to achieve same-floor layout of drainage pipes through the sinking of the structural layer, offering significant advantages in terms of toilet relocation and drainage performance.

A sunken bathroom involves partially or entirely sinking the bathroom's structural layer by 30cm to 40cm during the main construction, allowing horizontal drainage pipes (such as toilet waste pipes and floor drain pipes) to be buried within the sunken space. This design, through same-floor drainage technology, breaks the limitations of traditional inter-floor drainage on pipe positioning, providing a flexible solution for toilet relocation.
1. High Degree of Freedom in Toilet Relocation In traditional bathrooms with inter-floor drainage, the toilet's position is restricted by the drainage pipe layout of the downstairs occupants. Relocation requires drilling through the floor slab and modifying pipes, which is not only complex in construction but may also damage the waterproof layer or cause disputes with neighbors. In a sunken bathroom, pipes are hidden within the sunken space, allowing the toilet's position to be adjusted according to needs without drilling through the floor slab. Only the waste pipe needs to be rearranged within the sunken layer. For example, if the toilet needs to be moved from a wall-adjacent position to the center of the bathroom, simply lay new pipes within the sunken layer and connect them to the main waste pipe, significantly reducing construction difficulty and risk.
2. Improved Drainage Performance and Waterproof Safety Sunken bathrooms typically feature a secondary drainage system: a concealed drain outlet is set at the bottom of the sunken layer, connected to the main drainage pipe. Even if there is local leakage in the ground waterproof layer, accumulated water will drain through the secondary outlet, preventing long-term soaking that could cause structural damage or odor diffusion. Additionally, after pipes are buried in the sunken layer, backfill materials (such as expanded clay or foamed cement) can wrap the pipes, reducing the risk of cracking caused by thermal expansion and contraction of the pipes or external impacts, further ensuring drainage stability.
3. Noise Reduction and Space Optimization In traditional inter-floor drainage, pipes are exposed on the downstairs ceiling, and the noise from water flowing through the pipes during drainage can easily transmit through the floor slab. In a sunken bathroom, pipes are covered by backfill materials, forming a sound insulation layer that effectively reduces drainage noise. At the same time, the sunken design leaves no exposed pipes on the bathroom ceiling, eliminating the need to lower the ceiling height to hide pipes, making the indoor space appear more open and tidy.
The sunken bathroom design, through structural sinking and same-floor drainage technology, solves problems such as difficulty in toilet relocation, multiple drainage hazards, and high noise levels in traditional bathrooms, making it particularly suitable for scenarios with high requirements for spatial layout or drainage performance.




