Plastic-jacketed filter underdrain block
First Claim
1. A combination mold and jacket for a filter underdrain block, including support legs and opposite ends and sides, comprising a hollow plastic member preferred to form the jacket of a filter underdrain block, shaped to provide for the passage of fluid between said support legs, and defining an opening for receiving a castable fill material.
8 Assignments
0 Petitions
Accused Products
Abstract
A precast concrete, plastic-jacketed filter underdrain block for downflow or upflow filter units is disclosed. The plastic jacket additionally functions as a mold for the concrete. The plastic molds become an integral part of the finished filter underdrain block. Thus, relatively lightweight, inexpensive plastic molds can be fabricated and shipped to the filter construction site where they are filled with concrete, cured, and then placed in the filter unit to provide an underdrain system. The underdrain blocks may be equipped with handholds to facilitate the handling and placement of the blocks in the filter vessel. The blocks may also be provided with alternating vertical rigs on the outside vertical surfaces of the plastic jacket which create an interlocking system whereby when installed in the filter unit each block is interconnected to its adjacent side blocks thereby creating a uniform interconnected filter underdrain system which resists the uplifting and displacement of individual blocks during backwashing operations.
42 Citations
16 Claims
- 1. A combination mold and jacket for a filter underdrain block, including support legs and opposite ends and sides, comprising a hollow plastic member preferred to form the jacket of a filter underdrain block, shaped to provide for the passage of fluid between said support legs, and defining an opening for receiving a castable fill material.
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7. A filter underdrain block comprising:
a single-piece, hollow plastic jacket and a filler material cast within said jacket, wherein said plastic jacket has a top surface, a bottom surface, and end and side surfaces; and
said top surface defines an opening for receiving said filler material in castable form; and
said bottom surface is shaped to define a passage along said jacket.- View Dependent Claims (8)
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9. An underdrain system for filtering waste water, comprising filter media and an array of underdrain blocks for supporting the filter media, wherein each said block comprises:
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a single unitary preformed plastic mold shaped to provide for the flow of fluid under the mold, and having an opening for receiving uncured filler material; and cured filler material which fills at least a portion of said single unitary preformed plastic mold. - View Dependent Claims (10)
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11. A combination mold and jacket for a filter underdrain block, comprising:
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a first hollow plastic member having a top surface, a bottom surface, two end surfaces, and two side surfaces; said top surface defining a hole for receiving a castable filling material within the first hollow plastic member; and said bottom surface including two rows of legs laterally spaced to define a passage between said rows extending from one said end surface of the first plastic member to the other said end surface of the first plastic member. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification