This disclosure relates to the field of manhole comprising a base which is cast in place at the location of the manhole, optionally on an existing pipe.
Examples of a manhole assembly comprising in one example a manhole saddle tee. Also disclose is an associated method of installing the manhole assembly. The manhole saddle tee disclosed in one example with one installation method which may comprise several steps, not necessarily required in the order described, and not all steps are required.
In one example, it is often desired to install a new manhole assembly onto an existing pipe previously installed where the ends of the pipe are not available at the location where the manhole is desired. In other examples, the disclosed system may be used to ease in installation of a pipe and manhole at a location for various reasons including time available, cost, manpower, equipment available, etc.
In one example, the method for installing a manhole saddle tee disclosed herein comprises the steps of: exposing an exterior surface of pipe. This section referred to as a “joining section” for clarity in this disclosure. The process also comprising the step of cleaning the joining section of contaminates; cutting a pipe access hole in the pipe joining section to allow access to the interior of the pipe through the manhole saddle tee to be attached over the access hole. To ensure that fluids (water intrusion nor sewage leakage) do not pass the joint between the saddle and the pipe, a seal may be applied to the pipe around the perimeter surface of the pipe access hole. The saddle tee as disclosed herein is then connected exterior of the access hole, in contact with the seal (if present) to ensure fluids do not pass therebetween. When used, this seal may be mastic or other material.
Once prepared, the method of installing the manhole tee may include a step of positioning a saddle adjacent the perimeter surface of the pipe access hole. When a seal is used, the saddle is arranged such that the seal is positioned between the saddle and the joining section of the pipe. The saddle in one example having a surface defining a saddle access hole there through as will be disclosed. The saddle access hole aligned with the pipe access hole during installation to ensure maximum fluid flow through the assembly and reduce or eliminate fluid flow past the joint.
The saddle in one example having a spigot in an upper portion thereof. The spigot comprising a support surface and a radially outward facing alignment surface. There term spigot here referring to a structure that enters the end of a pipe to form a joint.
The saddle in one example having a flange in a lower portion thereof covering a perimeter surface of the pipe access hole. The method may include the step of encapsulating an exterior surface of the flange and the exposed exterior surface of the pipe with a grouting material such as concrete or an equivalent. These steps forming a base of the manhole assembly. The method may include the step of providing a riser having a bottom surface resting upon the support surface of the spigot and a radially inward surface engaging the alignment surface.
The method disclosed herein may further comprise the steps of drilling substantially cylindrical holes in the section of pipe; tapping the holes so as to form female threads therein; and installing male threaded bolts through a flange of the saddle into the substantially cylindrical holes in the section of pipe.
The method as recited herein may alternatively comprise the steps of installing a clamp around the saddle and the pipe, and radially tensioning the clamp so as to affix the saddle to the pipe.
The method as recited may include a step wherein the clamp is a saddle clamp. Such a saddle clamp comprising a first portion and a second portion tensioned by way of one or more tensioning members. In one example, the first portion and/or second portion may be coupled to or formed with the saddle.
The method as recited herein may alternatively be arranged wherein the clamp is a pipe clamp. A tensioning member is used to reduce the circumferential size of the pipe clamp and secure the saddle to the pipe.
In the field of manhole assemblies, it is customary to install manholes at a site at the same time that connecting (transmission) pipes are installed. Often these manholes comprise inlets, and once the manhole assembly is installed in an excavation (hole in the ground) at a site the connecting (inlet and outlet or transmission) pipes are attached to the manhole assembly and the excavation is backfilled. One such apparatus is disclosed in U.S. Pat. No. 1,712,510.
Problems arise where a transmission pipe is already present at a site, and a manhole is needed at the site. In such an application using known methods a large excavation is needed to access a large longitudinal length of the transmission pipe, or other accommodations must be made for a secure installation of a manhole.
Wherein such manholes are often provided in or near roads, the weight of vehicles driving over the manhole assembly create stress on the manhole, and on the transmission pipe which the new manhole is installed. In such applications, it is generally desired to transmit the force incurred by the weight of the manhole assembly, vehicles, etc. around or past the transmission pipe(s) rather than incurring compression pressure through the transmission pipe(s) which may cause failure of the entire assembly including the transmission pipe and manhole.
Disclosed herein is a method for installing a manhole assembly 20 upon a previously installed pipe 22 which in one example is buried or otherwise established in the ground 24 or otherwise not easily accessible prior to installation of the manhole. In some applications, the pipe 22 has been in use for some time prior to installation of the manhole assembly 20.
To install a manhole assembly 20 to a previously installed pipe 22 using the new method and apparatus (manhole assembly 20), an excavation 26 or hole in the ground 24 may be required to expose a joining section 28 of pipe 22 to which the manhole assembly 20 is to be affixed. The joining section 28 being that portion of the pipe 22 to which the manhole assembly 20 is to be directly affixed. To ensure a proper seal and to ensure that contaminants do not enter the pipe 22 during installation, the joining section 28 or a substantial portion thereof may be cleaned of contaminants such as dirt, oil, water etc. prior to cutting an access hole 30 in the pipe 22. Once this cleansing is complete, to ensure the proper size access hole 30 is formed through the pipe 22, the saddle 32 or a template thereof may be temporarily placed onto the joining section 28 of the pipe 22 as shown in
Before continuing, an axes system 10 is disclosed comprising a vertical axis 12 and a lateral radial axis 14. The lateral radial axis 14 is substantially centered upon the longitudinal axis of the manhole assembly 20 and projects laterally outward therefrom orthogonal to the longitudinal axis of the manhole assembly 20. Also disclosed is a transverse radial axis 16 substantially centered upon the longitudinal axis of the pipe 22 and extending radially therefrom. Lastly is disclosed a circumferential axis 18 which is tangential to the outer surface of the pipe 22 in a plane orthogonal to the longitudinal axis of the pipe 22.
One first step or stage of an example of installing the disclosed manhole assembly 20 onto a pipe 22 is to indicate where on the pipe 22 the manhole assembly 20 is to be installed. One example of this has been generally described. In
Looking to the example shown in
In one example, prior to installing the saddle 32 on to the outer (perimeter) surface 61 of the pipe 22 around the pipe access hole 30, a seal 62 may be provided there between. For example, shown in
In another example, shown in
In yet another example, generally shown in
In other examples, the saddle 32 may be adhesively attached, welded, screwed, bolted, or in other ways fixed to the pipe 22.
In addition, although described herein wherein the pipe access hole 30 is provided prior to installation of the saddle 32, it is understood that the saddle 32 may be installed to the pipe 22 prior to forming the surface defining the pipe access hole 30.
In addition, the pipe 22 and saddle 32 may be prepared as disclosed herein prior to installation of the pipe 22 in the ground or other location.
In one example, the saddle 32 is formed of a monolithic structure such as a polymer, resin impregnated fiberglass, resin impregnated carbon or other fiber, cast metal etc.
Once the saddle 32 is properly fitted to the pipe 22, a volume of grouting material 74 may be disposed into the excavation 26. A concrete form or other retaining structure or system to keep the grouting material 74 around the pipe 22 and saddle 32 until the grouting material 74 hardens or cures to a rigid state thus encapsulating a portion of the pipe 22 and substantial portions of the saddle 32.
In one example previously discussed, the saddle 32 is formed of resin impregnated fiberglass. The grouting material 74 may fill the excavation 26 past the saddle access hole 30 on the exterior of the pipe 22. In one example, the grouting material 74 extends upward to a bench 76 upon which the manhole riser 78 rests. In this way, the grouting material 74 transmits downward forces from the riser 78, cap 80, vehicles driving on the cover 81, etc. through the bench 76 and to the ground surface 24 below the grouting material 74 without substantial stress on the pipe 22. It is conceived in some examples that the saddle 32 has insufficient rigidity or structure by itself to support the weight of the riser 78 and manhole cap assembly 80 including the cover 81. Thus, the grout 74 transmits the forces exerted on the bench 76 and saddle access hole 50 without substantial force or stress on the saddle 32.
Looking to
One method of installing the manhole assembly 20 upon a pipe 22 comprises several steps, not necessarily required in the order described, and not all steps are required. In one example, the method comprises the steps of: exposing an exterior surface of a joining section 28 of the pipe; cleaning the joining section of contaminates; cutting a pipe access hole 30 in the joining section. To ensure that fluids do not pass between the saddle and the pipe, a seal 62 may be applied to the pipe around the perimeter surface of the pipe access hole. This seal 62 may be mastic 64 or other material.
Once the pipe is prepared, the assembly may be formed by positioning the saddle 32 adjacent the perimeter surface 61 of the pipe access hole 30 such that the seal 62 is positioned between the saddle 32 and the joining section 28. The saddle 32 in one example having a surface defining a saddle access hole 50 there through, the saddle access hole 50 aligned with the pipe access hole 30 during installation.
The saddle in one example having the spigot 83 in an upper portion thereof. The spigot comprising a support surface 84 upon which the riser 78 rests and a radially outward facing alignment surface 82 which is immediately adjacent the inner radial surface of the riser when assembled.
The saddle 32 in one example has a flange 70 in a lower portion thereof covering the perimeter surface of the pipe access hole 30.
The method of installation may include the step of encapsulating an exterior surface of the flange and the exposed exterior surface of the pipe with the grouting material 74 such as concrete or an equivalent to hold all components in place substantially permanently on the pipe 22, and to transmit compression forced around the pipe 22. These steps forming a base 90 of the manhole assembly 20.
The method may include the step of providing the riser 78 having a bottom surface 87 resting upon the support surface, optionally sealed to the spigot and a radially inward surface 85 engaging the alignment surface.
The method disclosed herein may further comprise the steps of drilling substantially cylindrical holes 56 in the section of pipe for attachment of the saddle 32 to the pipe 22. It may be desired to include a step of tapping the holes so as to form female threads therein; and installing male threaded bolts 58 through a flange of the saddle 32 into the substantially cylindrical holes 42 in the section of pipe 22.
The method as recited herein may further comprise a step of installing a clamp 68/72 around the saddle 32 and the pipe 22, and radially tensioning the clamp so as to affix the saddle 32 of the pipe 22.
In one example the clamp is a saddle clamp 72. Such a saddle clamp 72 comprising a first portion 72a and a second portion 72b tensioned around the pipe 22 and saddle 32 by way of one or more tensioning members. In one example, the first portion 72a and/or second portion 72b may be coupled to or formed with the saddle 32.
The method as recited herein may alternatively be arranged wherein the clamp is a pipe clamp 68. A tensioning member 69 or 69′ may be used to reduce the circumferential size of the pipe clamp 68 and secure the saddle 32 to the pipe 22.
In another example, shown in
As previously described, the saddle 32 may be attached to the pipe 22 by way of fasteners 58 as shown in
The example of
While the present invention is illustrated by description of several embodiments and while the illustrative embodiments are described in detail, it is not the intention of the applicants to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications within the scope of the appended claims will readily appear to those sufficed in the art. The invention in its broader aspects is therefore not limited to the specific details, representative apparatus and methods, and illustrative examples shown and described. Accordingly, departures may be made from such details without departing from the spirit or scope of applicants' general concept.
This application claims priority benefit of U.S. Ser. No. 62/724,496 filed Aug. 29, 2018, the contents of which are incorporated herein by reference.
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Number | Date | Country | |
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62724496 | Aug 2018 | US |