The plastic template is made of ABS and is difficult to test. The corrugated board is made of plastic to ensure the strength of the template during pouring. The convex platform has a circular hole with a neck sleeve to fix the embedded seat of the adjustable filter head.

The surface of the template should be flat, without defects such as cracks, shrinkage marks, bubbles, and overflow edges.

Use ABS special adhesive to bond the template and template overlap.

The template is fixed on the filter plate support with Φ 3 × 30 cement steel nails.

The template installation must be flat, tightly overlapped, and not leak grout.

When the template load is 4KN/㎡, the mid span deflection of the template should be less than 1.2mm.

When constructing a filter tank, the spacing between the filter beam and the wall, as well as between filter beams, should be designed to be 1m, which is more suitable to reduce template cutting.

When renovating the filter tank, the filter plate support can be arranged according to the single grid plane size and template module of the filter tank, and template cutting should be minimized as much as possible.

Mechanical properties of ABS material for plastic templates and filter caps

Construction and installation

Preparation before construction

1) Conduct acceptance inspection of the civil engineering of the filter tank according to the design requirements, and promptly review the level and pre embedded of the filter beam.

2) Check if there are any debris in the water and air holes of the cloth, and clean them thoroughly. Inspect the elevation and levelness of the ventilation holes to meet the relevant requirements for visitor construction.

3) Before installing the template, clean up the construction waste and debris inside the filter tank.

Construction and installation

Construction Drawing 1) Leveling of Filter Beam for Integral Pouring Filter Plate

Verify the thickness and height of the filter beam, and control the elevation error of ******* on the top surface of the filter beam to be ≤ ± 2mm, to ensure the levelness of the single pool and the levelness between each pool.

2) Reinforcement processing

① Check if there is a 300mm exposed length of the pre embedded steel bars (Φ 12 threaded steel) in the filter beam Xu.

② The end of the pre embedded steel bars around the pool wall should be bent 180 ° into a U-shaped hook, and the diameter inside the bending arc should not be less than 2.5 times the diameter of the steel bars. The length of the straight part after the hook is bent should not be less than 3 times the diameter of the steel bars.

③ The embedded steel bars supporting the filter plate should be bent at a 90 ° angle and welded to the longitudinal main bars of the filter plate. The inner diameter of the bend at the bend should not be less than 5 times the diameter of the steel bars.

3) ABS template installation

① Draw template elevation control lines and filter plate top elevation control lines around the filter tank walls and filter plate supports. At the same time, draw adjacent template centerlines on each filter plate support.

② Fix the template on the filter plate support with a Φ 3 × 30 cement steel nail. Several loads on a single template should be less than 100Kg/m2.

③ The template installation should be smooth, tightly overlapped, and not leak grout.

④ Before pouring concrete, the debris inside the formwork should be cleaned up.

4) Reinforcement laying

① Double layer laying of steel bars, generally with longitudinal steel bars of Φ 12 and transverse steel bars of Φ 10. Deviation of steel bar laying position: height ± 5mm, length ± 10mm.

② When welding the main reinforcement with the embedded steel bars on the pool wall and the reserved steel bars for the filter plate support, protective measures must be taken for the ABS plastic formwork to avoid damage.

5) Pre embedded seat installation

① Before installing the pre embedded seat, it is necessary to confirm that the template has been fully laid and the pre embedded seat is intact and undamaged.

② Insert the pre embedded seat vertically into the reserved hole of the template, tighten the locking pin on the pre embedded seat with the neck sleeve on the template, and tighten the construction cover.

6) Integral filter plate concrete pouring

① The pouring of filter plate concrete must be carried out on a suspended work platform, and it is strictly prohibited to directly step on the pre embedded seat of the filter head for construction.

② The concrete mix proportion should comply with the provisions of the industry standard "Design Specification for Ordinary Concrete Mix Proportion" JGJ 55.

③ Strictly control the vibration range, and in principle, require the vibration rod to be within 15-19cm of the center of the vibration distance. To ensure that the compactness and strength of the filter plate meet the design and process requirements. And it is required that there should be no bubbles or looseness.

④ After the initial setting of the filter plate concrete, the surface needs to be pressed three times by placing a springboard at the position supported by the filter plate. The horizontal error of the surface of the same grid filter tank should be within 10mm. The joint between the tank wall and the filter plate must be pressed three times continuously.

⑤ The joint between the poured concrete filter plate and the pool wall must be extended 20mm into the wall, and reinforced smoothing and compaction measures must be taken to prevent air leakage at the joint of the pool wall. After the concrete is smoothed, it must be smoothed at least three times.

⑥ The filter plate concrete should be poured continuously in one go, and the compactness and strength of the concrete should meet the design requirements. There should be no defects such as exposed reinforcement, honeycomb, voids, cracks, etc.

⑦ After the concrete pouring of the filter plate is completed, it should be covered with straw bags and cured with glue for at least 7 days.

⑧ During the concrete curing period, it is not allowed to step on or install filter heads while riding.

⑨ Before the filter plate reaches its strength (generally not less than 28 days), the supporting layer and filter material shall not be filled.

⑩ The filter plate concrete should be cured with clean water to maintain moisture and meet the 28 day curing conditions.

7) Installation of filter rod and filter cap

① After the curing period of the filter plate concrete is over, remove the pre embedded seat construction cover and install the filter rods in sequence at once.

② Inject water into the water distribution area of the filter tank until the upper opening of the adjustment thread in the pre embedded seat is level, serving as the benchmark for adjusting the filter rod. Use a specialized tool to adjust the filter rod so that its upper surface is at the same level as the water distribution area.

③ After adjusting all filter rods horizontally, install the filter caps again in sequence and tighten them with specialized tools.

Debugging and acceptance

① When the filter tank is empty, the inflow must be uniform and free of dead corners. When the water level rises to about 30cm above the filter surface, the intake begins with a pressure of about 30kPa. Observe the uniform water spray (bubbles) emitted by the filter head, Wu Sijia, for 20 minutes.

② After the water testing and debugging meet the requirements, it is considered as qualified for acceptance. Only then can the supporting layer and filter material be filled as required.

Packaging and transportation

The inner packaging of the filter head is a film bag, and the outer packaging is a corrugated box. Each package can only contain the same specification and comes with a product certificate of conformity. The outer packaging of the product should have markings that comply with the "Transport Packaging ******* Standard" (GB/T 6388), and should be printed with graphic markings that comply with the "Packaging Storage and Transportation Graphic Markings" (GB 191). ）

precautions

① The template and filter head packaging should be stored in a warehouse or simple shed with an ambient temperature below 40 ℃, and should not be stored outdoors, away from heat sources. Do not come into contact with organic solvents such as ketones, phenols, hydrocarbons, and glacial acetic acid.

② The filter wall and filter beam must be connected to the steel reinforcement skeleton of the filter plate, and the newly designed filter tank wall has 20mm~40mm grooves. The renovation of the old pool can implant chemical bolts or expansion bolts on the filter wall, and roughen the connection between the pool wall and the filter plate.

③ Each single pool must be poured in one go (within 8-12 hours).