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Monolithic filter head filter plate 

Monolithic filter head filter plate

Product Introduction

ABS monolithic casting filter plate formwork

It is a special plastic formwork for installing adjustable filter head and completing integral pouring of reinforced concrete filter plate in the filter tank, referred to as formwork for short.

The formwork surface shall be flat and free of cracks, shrinkage marks, bubbles, overflow and other defects.

The overlapping part of formwork and formwork shall be bonded with ABS special adhesive.

For formwork Φ three × 30 cement steel nails are fixed on the filter plate support.

Formwork installation must be flat, tightly lapped and free of mortar leakage.

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

 

Model, specification and technical parameters of plastic formwork

Formwork size

Embedded hole seat of filter head

Template model

length(mm)

width(mm)

height(mm)

thickness(mm)

aperture(mm)

Hole pitch(mm)

A型

960

915

80

5

47

portrait165

transverse150

B型

960

960

80

3

47

portrait135

transverse135

When the filter tank is newly built, the spacing between the filter beam and the wall, as well as between the filter beam and the filter beam, should be designed to be 1m, so as to reduce the formwork cutting.

When the filter tank is rebuilt, the filter plate support can be arranged according to the plane size of the filter tank and the formwork modulus, and the formwork cutting should be minimized.

Material (ABS) mechanical properties of plastic formwork and filter cap

project

Company

index

tensile strength

MPa

35-45

impact strength

kJ/m2

9-30

Shore hardness

degree

98-108

 

Construction and Installation

1. Pre construction preparation

1) The civil engineering of the filter tank shall be accepted according to the design requirements, and the level and embedment of the filter beam shall be rechecked immediately.

2) Check whether there are sundries in the holes for water and air distribution and clean them. The elevation and levelness of the air distribution holes shall be tested to meet the relevant requirements.

3) Before installing the formwork, clean up the construction waste and sundries in the filter tank.

2. Construction method

1) Filter beam leveling

Check the thickness and height of the filter beam, and control the absolute elevation error of the top surface leveling of the filter beam to be ≤± 2mm to ensure the levelness of the single tank and the levelness between each tank.

2) Reinforcement processing

① Check the embedded reinforcement of filter beam( Φ 12 deformed steel bars).

② The end of the embedded reinforcement around the pool wall shall be bent 180 ° to form a U-shaped hook. The inner diameter of the arc shall not be less than 2.5 times the diameter of the reinforcement. The length of the straight part of the hook after completion shall not be less than 3 times the diameter of the reinforcement.

③ The embedded reinforcement of the filter plate support shall be bent 90 ° and welded with the longitudinal main reinforcement of the filter plate. The inner diameter of the bend at the bend shall not be less than 5 times of the diameter of the reinforcement.

3) ABS template installation

① Draw the formwork elevation control line and filter plate top elevation control line on the wall and filter plate support around the filter tank. At the same time, draw the center line of adjacent formwork on each filter plate support.

② Use Φ three × 30 cement steel nails fix the formwork on the filter plate support. Several loads on single formwork shall be less than 100Kg/m2.

③ The formwork shall be installed flatly and tightly without mortar leakage.

④ The sundries in the formwork shall be cleaned before concrete pouring.

4) Reinforcement laying

① Double layer laying of reinforcement, generally longitudinal reinforcement Φ 12. Transverse reinforcement Φ 10. Deviation of rebar laying position: height ± 5mm. Length ± 10mm.

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

5) Installation of embedded base

① Before installing the embedded base, it must be confirmed that the formwork has been completely laid and the embedded base is intact.

② Insert the embedded seat vertically into the reserved hole of the template, so that the clamp pin on the embedded seat is tightly bound with the neck sleeve on the template,

And tighten the construction cover.

6) Concrete pouring of integral filter plate

① Hanger type working platform must be set up for concrete pouring of filter plate. It is strictly prohibited to directly step on the embedded seat of filter head for construction.

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

③ The vibrating range shall be strictly controlled. In principle, the vibrating distance of the vibrating rod shall be within 15-19cm of the centering. To ensure that the compactness and strength of the filter plate meet the design and process requirements. It is required that there shall be no bubbles and looseness.

④ After the initial setting of the filter plate concrete, the surface shall be polished three times after placing the springboard at the position supported by the filter plate, and the horizontal error of the filter tank surface shall be 10mm. The joint between the tank wall and the filter plate must be polished three times continuously.

⑤ The joint between the poured concrete filter plate and the pool wall must extend into the wall for 20mm, and strengthened polishing and compaction shall be taken to prevent air leakage at the joint of the pool wall. After the concrete is plastered, it must be polished for more than three times.

⑥ The filter plate concrete shall be poured continuously at one time, and the compactness and strength of the concrete shall meet the design requirements. There shall be no exposed reinforcement, honeycomb, cavity, crack and other defects.

⑦ After the filter plate concrete is poured, the concrete shall be covered with straw bags and cured with glue. The curing time shall not be less than 7 days.

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

⑨ Before the filter plate reaches the strength (generally no less than 28 days), the supporting layer and filter material shall not be filled.

⑩ Filter plate concrete shall be cured with clean water and kept wet to meet 28 day curing conditions.

7) Installation of filter rod and filter cap

① After the curing period of the filter plate concrete expires, remove the construction cover of the embedded base and install the filter rod in sequence at a time.

② Inject water into the water distribution area of the filter until the upper opening of the adjusting thread in the embedded seat is flush, which is used as the adjustment benchmark of the filter rod. Use a special tool to adjust the filter rod so that its upper plane is at the same level with the horizontal plane of the water distribution area.

③ After the horizontal adjustment of all filter rods is completed, install filter caps in sequence again and fasten them with special tools.

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