Handle for underdrain
An underdrain block including a top wall, a bottom wall, and a pair of sidewalls defining a hollow interior and having a longitudinal axis, wherein the sidewalls, top wall, or both comprise at least one external detail. A handle is detachably connected to the external detail for transportation and positioning of said underdrain block. The external detail may comprise one of a protrusion or a receptacle for receiving a protrusion and the handle may include the other of a protrusion or a receptacle for receiving a protrusion. Also, a method of installing an underdrain block lateral comprising at least one underdrain block including the steps of attaching a handle to external details on the underdrain block, lifting the underdrain block lateral by the handle, positioning the underdrain block lateral into the underdrain system, and detaching the handle from the external details of the underdrain block.
1. An underdrain block for use in draining and backwashing filtering media in a filter bed of the type where liquid may be supplied to the filtering media from a position vertically above the media and passed down through the media to an underdrain system including a plurality of said underdrain blocks, said underdrain block comprising:
a plurality of exterior walls defining a hollow interior and having a longitudinal axis, said exterior walls including a top wall, a bottom wall, and a pair of sidewalls extending between said top wall and said bottom wall, said sidewalls, top wall, or both having at least one external detail and said top wall having at least one aperture; and
a handle detachably connected to the at least one external detail for transportation and positioning of said underdrain block,
wherein the handle comprises a horizontal portion and two vertical portions attached to each end of the horizontal portion, and
wherein an attachment point between the horizontal portion and each of the vertical portions is flexible enough to allow the vertical portions to be deflected outwardly a distance which is at least equivalent to a width of the at least one external detail, and return to their original positions when a deflecting force is removed.
2. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 1 , wherein the at least one external detail comprises one of a protrusion or a receptacle for receiving a protrusion, and the handle includes the other of a protrusion or a receptacle for receiving a protrusion.
3. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 2 , wherein the at least one protrusion or receptacle for receiving a protrusion corresponds with the other of a protrusion or a receptacle for receiving a protrusion on the handle such that, when a corresponding protrusion is received in a corresponding receptacle, the handle is detachably attached to the underdrain block.
4. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 2 , wherein at least one external detail is a protrusion and the handle has at least one hole.
5. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 1 , wherein the at least one external detail is a protrusion having a top portion and a bottom portion, wherein an upper surface of the top is sloped and the bottom portion is sized and shaped to correspond with a correspondingly sized and shaped hole in the handle.
6. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 1 ; wherein the handle further comprises a protrusion or a receptacle for receiving a protrusion at the bottom end of each of the vertical portions.
7. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 6 , wherein the handle comprises at least one receptacle for receiving a protrusion and said receptacle is a hole.
8. The underdrain block for use in draining and backwashing filtering media in a filter bed according to claim 1 , further comprising more than one external feature on each sidewall and at least one handle.