Container House Drainage Pipe Drawing

When examining container house drainage pipe drawings, it is essential to focus on layout principles and drawing interpretation methods. The key points are as follows:

I. Layout Principles

1. Same-floor drainage as the primary approach

   • Ground-floor drainage: The drainage branches of all ground-floor sanitary fixtures (toilets, floor drains, washbasins, kitchen sinks) should be collected under the floor and directed to the horizontal main drainage pipe. The slope of this horizontal pipe should be ≥2% to ensure smooth drainage. Ultimately, it should connect to the main drainage riser at the bottom of the container or discharge directly to an outdoor septic tank/municipal sewer interface.
   • Second-floor drainage: The drainage branches of second-floor sanitary fixtures are also collected under the floor of that level. The main drainage horizontal pipes and risers are typically arranged in the ceiling space of the ground floor (interlayer drainage), with the risers ultimately converging or being led out separately at the ground floor. This design reduces the space occupied by pipes but requires attention to maintenance accessibility.

2. Ventilation system

   • The top of each main drainage riser must extend above the roof or high on the side wall and be fitted with a vent cap. The vent cap balances the air pressure inside the pipes, preventing the destruction of water seals, which could lead to odor backflow or poor drainage. For high-rise container houses, a loop vent or dedicated vent pipe should be installed according to regulations.

3. Water seals and odor prevention

   • All drainage fixtures (floor drains, washbasins, sinks) must be equipped with a water trap (P-type or S-type) below them. The water trap uses stored water to form a seal, blocking sewer odors and pests. According to Section 2.4.6 of the national standard GB50015, the height of the water seal in the trap must not be less than 50 millimeters. If a mechanically sealed floor drain is used, regular maintenance is required to ensure its sealing performance.

II. Drawing Interpretation Methods

1. Steps for interpreting drawings

   • System diagram: First, examine the system diagram to clarify the direction of the main pipes, the location of the risers, and their connection to the municipal sewer network.
   • Floor plan: Use the floor plan to determine the positions where pipes should avoid obstacles (such as doors, windows, and structural beams) to prevent construction conflicts.
   • Sectional view: Confirm the pipe elevations through the sectional view, paying special attention to the “elevation symbols” and the “slope i value”. The installation of drainage pipes must be based on the “bottom elevation of the pipe” to ensure the slope meets the design requirements.

2. Drawing markings

   • Before construction begins, mark all bends and diameter changes on the drawings and check for conflicts with structural and electrical components. For example, the distance between drainage pipes and cable trays should be ≥300 millimeters to avoid cross-interference.
   • Pay special attention to checking whether odor-prevention components such as water traps and vent caps are clearly marked on the drawings to avoid omissions that could lead to rework later.

III. Construction Precautions

• Pipe connections should be made using rubber ring seals or hot-melt connections to ensure no leakage.
• A cleaning port should be installed at the bottom of the drainage riser for easy maintenance and unclogging later.
• If the container house is located in a cold region, the outdoor drainage pipes should be insulated to prevent freezing and cracking.