About this item

1. Left-Hand & Right-Hand 90° Junction (Cross) Manholes Left-hand and right-hand 90° junction (cross) manholes are specialized access structures used in sewer, stormwater, and utility systems. These manholes are designed to accommodate pipe entries that intersect at 90 degrees, either from the left or right side, facilitating flow redirection, access, and maintenance in complex underground networks. 2. Material and Durability A common type of manhole used in modern infrastructure is constructed from Polyvinyl Chloride (PVC). PVC manholes are highly durable, corrosion-resistant, and chemically stable, making them suitable for harsh underground environments. Their lightweight design also allows for easier transport and installation compared to traditional concrete options. 3. Purpose and Function Manholes provide essential access to underground utility systems for: Inspection Cleaning Maintenance and repairs They are used in: Sewerage systems Stormwater drainage networks Other buried utility services Manholes come in various shapes and sizes, typically circular or rectangular, and are designed according to the functional requirements and site constraints. 4. 90° Junction (Cross) Configuration The 90° junction manhole (cross) allows pipelines to connect at right angles, providing efficient directional changes and network branching. These manholes can be configured as: Right-hand 90° junction: The inlet/outlet branch connects from the right side. Left-hand 90° junction: The inlet/outlet branch connects from the left side. This orientation ensures that the pipeline layout suits the site geometry and enables smoother transitions in flow direction. 5. Manhole Orientation The orientation—left-hand or right-hand—is an important consideration in system design. It affects: Ease of maintenance Flow direction control Safety and accessibility The choice between left-hand or right-hand orientation depends on: Site layout Space limitations Underground utility alignment Obstacle avoidance Proper orientation reduces excavation complexity and helps integrate the manhole efficiently into the overall network. 5. Covers and Safety To ensure safety, manholes are equipped with detachable top covers—typically made from cast iron or steel—to: Prevent accidental falls Protect the utility area from debris Withstand heavy surface loads (e.g., vehicular traffic) These covers are critical infrastructure components and are mandated by local authorities or service providers to maintain public and operational safety. Advantages of 90° Junction Manholes Streamlined connectivity for pipe intersections Reduced excavation requirements, saving on cost and labor Enhanced flow management through precise directional branching Facilitated inspections and maintenance access.