US2492823A

US2492823A - Joint for sewer pipes

Info

Publication number: US2492823A
Application number: US54440A
Authority: US
Inventors: Nathaniel P Young
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-10-14
Filing date: 1948-10-14
Publication date: 1949-12-27
Anticipated expiration: 1966-12-27

Description

Dec. 27, 1949 YOUNG JOINT FOR SEWER/PIPES Filed Oct. 14, 1948 INVENTOR. Nadkarzz'eZ Peyvforz you Patented Dec. 27, 1949 UNITED STATES PATENT OFFICE:

JOINT FOR. SEWER PIPES Nathaniel P. Young, Fairfax, Va.

Application October 14, 1948, Serial No. 54,440

3 Claims.

The object of the present invention is to provide an improved joint for sewer pipes and more particularly for concrete or terra cotta pipe. The high cost of metal pipe, especially in the large sizes required for sewer lines prohibits the use of such pipe and concrete pipe is now almost universally used in sewer line construction, especially in suburban areas. In the early stages of the use of concrete pipe for community sewer lines, attention was given primarily to preventing leakage from the interior to the exterior of the lines and any joint sufiiciently water tight to effect that object was deemed to be satisfactory. However with the rapidly increasing density of population in suburban areas and where the sewerage is being delivered to sewage treatment plants the problem of preventing infiltration of water from the outside to the sewage flow has become of great importance. This is because many of the sewage treatment processes involve the use of chemicals in measured quantities or the employment of bacterial agents and where the water flow far exceeds the anticipated amount these treating elements are washed out and incompletely treated sewage is discharged into and pollutes the adjacent rivers and streams. In a recent test a sewer line which was assumed to be carrying three hundred thousand gallons of water per day to a sewer treatment plant was found to be carrying nearly nine hundred thousand gallons and the diiference was made up almost entirely of water of infiltration from outside the line. Some sewer lines and in fact most sewer lines are laid in ditches so deep that the water level in the ditch may rise to such a point as to create an external pressure head that is much in excess of the internal pressure and where leaky joints are present the extent of the entry of water of infiltration may be very great.

It is common practice to provide matching male and female ends upon the sewer pipe sections of such configuration as to leave annular chambers into which sealing compounds of either a hydraulic cement mixture or a bituminous mixture are poured. Many of the faulty joints heretofore constructed are caused by the formation of pockets of trapped air in the sealing compounds and a primary object of this invention is to provide a joint which will be waterproof against either internal or external pressures, will be free of air pockets and will be proof against the entry of roots.

The invention will be best understood by reference to the accompanying drawing wherein:

Fig. 1 is a longitudinal sectional view; and

Fig. 2 is a transverse vertical sectional view through a sewer pipe joint constructed in accordance with the invention.

In the drawing 5 designates a pipe section having a female or hell end portion 6 which terminates in the annular wall 1 and is internally beveled at 8. A companion male pipe section 9 terminates in a nipple or neck extension I 0 having a beveled end II which serves, by its entry into the beveled seat 8 of the female member to aid in centering the two sections with respect to each other. The external diameter of neck extension [0, with respect to the internal diameter of wall 1, is such as to leave an annular chamber [2 between them. The outer end of this chamber I2 is closed by a lateral circumferential flange I3 of pipe section 9. An opening 14 through wall 1 provides a port through which a sealing compound l5 may be poured. The compound employed has the characteristic that it is of a bituminous water repellent nature, plastic under heat, hard and dense when cold, non-granular, very quick setting when cold and one which gets cold and hard very quickly, especially when contacting the air. To prevent the formation of air pockets as the hot compound is poured into the chamber [2, one or more openings I6, I61: are formed in the neck extension In so that any air trapped in the lower portion of the chamber may escape as the level of the compound in the chamber rises. As soon as the rising compound reaches the upper end of the opening IE it seals said opening by its capacity for quick cooling. As the level rises farther any additional trapped air may escape through openings I6a which openings will in their turn be sealed as the quickly hardening compound enters them. It is to be noted that the vent openings 16 and 16a are formed in a portion of the pipe that is protected from the surrounding dirt of the trench. Also these openings are accessible to workmen. Since these sewer pipe sections are relatively short, it will be possible for a workman to reach through one of them with a stopper, such as an old piece of rubber belting on a stick, to lay over the openings 16, [6a if the sealing compound does not harden quickly enough to prevent some of it from entering the interior of the sewer line. pounds of the character described are commonly in use and may be purchased at any plumbing supply house. They tenaciously adhere to the material of either cement or terra cotta pipes, and seal all joints in a waterproof and root proof manner.

It will be noted that the inner end of the neck Sealing comextension l0 contacts the confronting end of the female section before the flange l3 contacts the front end of the wall I of the bell end. This accomplishes the double purpose of preventing the sealing compound from running directly out of the chamber 12 and into the interior of the sewer line, and of leaving flange I2 spaced far enough away from the end of wall 1 to permit some of the sealing compound to enter and seal said space.

Having describe-:1 my invention, what I claim is:

l. A pipe line comprising matching male and female sections one of which terminates in a bell end and the other of which terminates in a neck extension which enters said bell end and lies in such spaced relation thereto as to leave a circumferential chamber therebetween thema terial of the bell end having an opening formed therethrough at the top thereof for the entry of a flowable sealing compound into said chamber, a flange upon the male member which closes the open mouth of the bell, an air vent opening formed through the wall of the lower portion of the neck extension and establishing communication between said chamber and the interior of the male pipe section, a quick settingsealing compound in said chamber, the inner end of the neck extension having closely contacting engagement with a confronting face of the bell end, to aid in confining the sealing compound to the circumferential chamber.

2. A pipe line comprising matching male and female sections one of which terminates in a bell end and the other of which terminates in a neck extension which'enters said bell end and lies in such spaced relation thereto as to leave a circumferential chamber therebetween the material of the bell end having an opening formed there through at the top thereof for the entry of a flowable sealing compound, a flange upon the male member which closes the open mouth of the bell, an air vent opening formed through the neck extension and establishing communication between said chamber and the interior of the male pipe section and a sealing compound in said chamber, said vent opening being at the bottom side of the neck extension and additional like vent openings at points higher up the sides of the neck extension, the inner end of the neck extension having closely contacting engagement with a confronting face of the bell end to aid in confining the sealing compound to the circumferential chamber.

3. A'pipe line comprising matching male and female sections one of which terminates in a bell end and the other of which terminates in a neck extension which enters said bell end and lies in such spaced relation thereto as to leave a circumferential chamber therebetween the material of the bell end having an opening formed therethrough at the top thereof for the entry of a sealing compound, a flange upon the male member which substantially closes the open mouth of the bell but lies in slightly spaced relation thereto, an air vent opening formed through the neck extension at thebottom :side thereof and establishing communication between sai-dlchamber and the interior of the male pipe section and a sealing compound in said chamber. said sealing compound being of a bituminous, non granular, thermo plastic, quick cooling and setting nature and one which tenaciously adheres to the walls of the pipe sections, the inner end of the neck extension contacting an abutting face of the female section to aid in confining the sealing compound to the circumferential chamber.

NATHANIEL P.. YOUNG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 340,046 Hurlbut Apr. '13, 1886 1,881,943 Rader Oct. 11, 1932 2,322,587 Payne June 22, 1943