PP module rainwater collection module construction points
PP module rainwater collection system is an important part of the rainwater collection and utilization system, construction in the concrete base, according to the design requirements assembled rainwater collection storage module, and then wrapped with geotextile, impermeable membrane, etc., formed a specification of different, flexible shape, easy to install underground storage tank.
Construction process and operation points
1 Construction process flow
Construction preparation → positioning and alignment → excavation → foundation → (bottom impermeable layer construction) paving HDPE composite geomembrane → module assembly → outer impermeable layer construction → protective layer → earth backfill.
2 operation points
2.1 Construction preparation
(1) Preparation of special construction program, careful and detailed program and technical briefing before construction.
(2) Understand the location and size of the connecting pipes according to the drawings, verify the variety, specification and quality of the incoming materials, and use them only after they have passed the inspection.
2.2 Positioning and alignment
According to the design drawings and the site, measurement and positioning are carried out to determine their location, size and elevation.
2.3 Earth excavation
Excavation must follow the principle of “excavation in layers and over-excavation is strictly prohibited”. Effective measures should be taken for safe construction of unstable slopes.
2.4 Foundation construction
The general practice of foundation division is: gravel bedding layer 50mm; C25 and above plain concrete footing or reinforced concrete footing; sand bedding layer or sand layer on top.
(1) Gravel, sand and sand specifications and quality should meet the design requirements, the bedding layer should be laid smoothly and evenly.
(2) The bottom slab is surrounded by plywood for side moulding, 50×80 wood square for back fixing, the tying of reinforcement mesh should meet the design requirements; the concrete should be placed with a flat vibrator to vibrate and smoothen.
2.5 (bottom impermeable layer construction) laying HDPE composite geomembrane
According to the pool design square volume to determine the size of HDPE film, welding after the horizontal unfolded laid in the top of the pool, slowly put to the bottom of the pool, HDPE film landing requirements flat without wrinkles.
