US2162926A

US2162926A - Drainage tile

Info

Publication number: US2162926A
Application number: US226282A
Authority: US
Inventors: Frank S Wuelker
Original assignee: LACLEDE CHRISTY CLAY PRODUCTS
Current assignee: LACLEDE CHRISTY CLAY PRODUCTS; LACLEDE-CHRISTY CLAY PRODUCTS Co
Priority date: 1938-08-23
Filing date: 1938-08-23
Publication date: 1939-06-20
Anticipated expiration: 1956-06-20

Description

Patented June 20, 1939 UNITED STATES DRAINAGE TILE Frank S. Wuelker, St. Louis, Mo., assignor to. Laclede-Christy Clay Products Company, a corporation of Missouri Application August 23, 1938, Serial No. 226,282

1 Claim.

This invention relates to drainage tiles, and consists in a tile for under-drain filters that is efficient, durable, and cheap to manufacture.

In the accompanying drawing Fig. I is a view in perspective of the tile of the invention, and

Fig. II is a view of it in plan from beneath.

It has long been the practice of engineers, in preparing plans and specifications on sewagetreatment plants of the trickling filter type, to

specify that split sewer pipe be placed in rows about two feet apart, split side down, on the floor of the tank; and upon the so-placed pipe broken stone is heaped and spread within the tank, to a depth of about seven feet. In the operation of the plant liquid sewage is spread upon the upper surface of the bed of stone, and filterin action ensues. The fioor of the tank slopes to a central well and the rows of split pipe that lie upon the floor of the tank afford channels, to aid in causing the eflluent to pass to the well. They afford also access of air, for aeration of the bed of stone. V

A split pipe, with no further refinement of shape, is ill-suited to such service; because, in the prolonged operation of the filter, a jelly collects at the line where the split pipe rests on the floor of the tank; and the so collecting jelly hinders the escape of efliuent and hinders also the ingress of air. To overcome the difficulty, the

30 proposal has been made, to notch the edges of the lengths of split pipe; but it has been found that by the notching the load-bearing strength of the split pipe has been seriously impaired. It has become the practice, therefore, to provide 35 drainage tile members for this use of more elaborate structure, and of more costly production.

I have found that I may retain the simpler structure of a split pipe with notched edges by so arranging the notches that they succeed one an- 40 other in staggered arrangement on opposite edges throughout the length of the pipe; that at no point does a notch on one edge come opposite to a notch on the other edge; and that in the longitudinal succession of opposite notches an in- 45 tegral and unnotched portion of the pipe shall intervene between each notch and the next succeeding (and opposite) notch. Referring to Fig. II of the drawing, the length of split pipe I is, along its two edges notched with notches 2, 3, 4.

50 5, etc. The staggered arrangement is manifest; while between notch 2 on one edge and notch 3 on the other, a length of unnotched pipe body a, marked off by dotted lines, intervenes.

Consider now the structure of the split pipe laid split side down upon the floor of the filter tank. It becomes a barrel vault, carrying the load of the filter bed. It is characteristic of the tile of my invention that, throughout all of its 5 extent, and on every plane of cross-section, the crown of the vault, on one side at least, finds direct support on the floor of the tank. Throughout the intervals a such direct support is afforded on both sides; and elsewhere, the support on one 10 side being direct, it is on the other side forked: the support for such portion of the vault is Y- shaped. That is to say, considering the portion b, its support on one side is direct, as by the stem of a Y at c; and on the opposite side it .is forked 15 as through the branches of a Y, at d and e. Spe+ cifically, the split pipe of my invention may have a cylindrical and uniform body 36 inches long and 8 inches in diameter (or, perhaps, 6 or 10 or 12 inches in diameter). At one end it may be 20 provided with a bell for bell-and-spigot union with another like unit, or it may be plain and unelaborated. Along each edge of the uniform body four slots are formed, each 3 inches long and 2 inches deep. The centre to centre spacing is 8 inches. The slots are staggered in their succession. along the two edges, and the centre to centre spacing from a slot on an edge to the next succeeding slot on the other edge is (measured in the length of the pipe) 4 inches. The intervals a, then, of continuous and unnotched body, are 1 inch in longitudinal extent. I give these figures by way of illustration, merely.

With slots so arranged and proportioned the load is evenly distributed and the structure is strong to sustain the load. The desired facility of fiow of efliuent is afforded and the desired aeration.

I claim as my invention:

A drainage tile for a filter consisting of a split pipe with notched edges, the notches upon the opposite edges being arranged in staggered succession, and the length of each notch being less than the centre to centre interval between a notch on one edge and the next succeeding notch on the other, whereby portions of the vault afforded by the tile when in service extend between the notches, in continuity from the supporting floor on one side to the supporting floor on the other.

FRANK S. WUELKER.