The nearly perfect squareness and north–south orientation of the Great Pyramid of Giza, built c. 2700 BC, affirm the Egyptians' command of surveying. No tools needed to attach to rod. New round foot design slices through material at bottom of pipe and insures accurate invert and pipe diameter measurement. The position of a sewer invert is determined by measuring the vertical position of the manhole cover using a levelling instrument and the distance between cover and sewer invert using a rod. Best Storm and Sanitary Sewer Invert method. Alternatively, as shown in FIG. Arranged at the upper end of the sleeve is a bushing sized to make a closer fit to the sight rod. Clamped to the lower end of the sight rod is a lateral arm 12 which extends downward and laterally. At its distal end is a cylindrical bar 13 which serves as a contact point for contacting the inside diameter of the pipe 3 at its lowest point, known in the art as the invert. FIG. Set up the instrument over a known elevation b. **Example** Here is a better example of how elevations can be important as they relate to plumbing. The arrangement for adjusting the rod to be plumb when the horizontal bar 10 is resting on the manhole 2 includes a reduced diameter upper portion 23 of sleeve 17 and three adjusting screws 16 arranged in a lower plane on the sleeve. A sight rod is slideably mounted on a sleeve fixed to the bar. FIG. 2, the measuring instrument 9 of the invention is shown in operation at a box union 1. How can we find the elevation of the house? This may be formed of a resilient material. The reduced diameter upper portion 23 of the sleeve may be integral with the rigid sleeve 17 as in FIG. The above disclosed invention has a number of particular features which should preferably be employed in combination although each is useful separately without departure from the scope of the invention. Archive View Return to standard view. The measurement is critical in certifying that proper slope is maintained for drainage. 33/1H, 33/832, 33/836, 33/1H, 33/290, 33/291, 33/292, 33/293, 33/294, 33/295, 33/296, 33/286, 33/529, 33/713, 33/719, 33/836, Click for automatic bibliography FIG. 3. Referring now to FIG. This is usual practice to 'as-built' a site (but doesn't address pipe sag). The position of a sewer invert is determined by measuring the vertical position of the manhole cover using a levelling instrument and the distance between cover and sewer invert using a rod. These and other objects, advantages and features of the invention will become more apparent when the detailed description is studied in conjunction with the drawings. Surveying a sewer line requires making this measurement frequently at considerable cost. 3 or provided as a grommet or bushing 25 as shown in FIG. Referring now first to FIG. An invert-contacting member is removably attached to the lower end of the sight rod. Since the hypotenuse D of the larger triangle is known by measurement, the leg A of that triangle is readily calculated. The lateral arm 12 is provided with two alternate attaching holes 19 for adjusting the lateral extent of the arm. The instrument according to claim 4, in which said adjusting screws are disposed in a horizontal plane at a first level of said sleeve means, said sleeve means having a first effective inner diameter at said first level and a smaller effective inner diameter at another level. In civil engineering, the invert level is the base interior level of a pipe, trench or tunnel; it can be considered the "floor" level. The instrument according to claim 6, in which said smaller effective inner diameter includes a resilient portion. The above disclosed invention has a number of particular features which should preferably be employed in combination although each is useful separately without departure from the scope of the invention. The instrument according to claim 4, further comprising a sight rod having graduation markings thereon arranged for directly reading the elevation of the invert relative to the manhole. The procedure is awkward and subject to error. 3, 4a and 4b show in greater detail the structure of the measuring instrument 9. 4 is an exploded perspective view of the instrument of the invention with portions broken away. Referring now first to FIG. An invert level is defined as the elevation of the inside-bottom of a pipe, trench, culvert, ... the invert of a municipal sewer connection can impact the sewer system of a newly constructed house or building. Set up the instrument within 300 feet of all points to be surveyed c. On the best smooth level surface d. Set up the instrument in order to see both the highest point and lowest point on the loop. Device for measuring the rotating moment of an accessory tube that can be moved through an adjustment operation. 6. At its distal end is a cylindrical bar 13 which serves as a contact point for contacting the inside diameter of the pipe 3 at its lowest point, known in the art as the invert. The instrument is arranged to be readily assembled for use and then disassembled for transport and storage in a compact configuration. Our survey team goes out and does survey of EXISTING pipe networks with a device that collects points. ... as a minimum drop of approximately 0.20 feet is maintained between inverts. If the elevation is to be read off at the top of vertical sleeve 17, markings 27 are adjusted by subtraction of the distance between the top of sleeve 17 and the bottom of horizontal bar 10. The sleeve has an inner diameter great enough to freely pass a surveyor's sight rod. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION. It may be read directly off the sight rod when the rod is specially marked with corrected graduations. Are A and B invert elevations or rim elevations? The sleeve has an inner diameter great enough to freely pass a surveyor's sight rod. A spirit level clamped on the sight rod provides visual indication of the true vertical position of the rod while supported on the manhole. Modern sewer pipe is made of PVC and is joined either with gasketed fittings or with solvent glue. a. Sewer pipe is installed one section at a time, typically starting at the lower end of the pipe run and working up to the higher elevation. The height of the instrument is the rod reading plus 100.00 (the benchmark). The sleeve has adjustments for mounting the bar in true vertical and plumb position with a spirit level. FIG. Most architects arbitrarily set the ground level elevation at 100'-0" - so piping located 2 feet below the slab can either have an invert of 2'-0" or an elevation of 98'-0". A plumb bob 6 is dropped from a bar 7 resting on the rim of the manhole at the sight rod. The instrument of the invention comprises a horizontal bar to lay across the top of the rim of the manhole. The instrument according to claim 1, in which said plumb indicating means includes a bubble level. While extremely dangerous and not in compliance with many regulations, physically entering sewer manholes to obtain invert elevations is still practiced by some today. To find an elevation, simply set the rod foot at any location on the job within the range of your laser or optical instrument. Used with any standard survey pole. Vertical alignment . The task for the surveyor is to measure the vertical distance A from the upper edge of the manhole 2 to the invert 4, the lowest point of the inside of pipe 3. Currently we take a wide blade tape and measure from the center of the lid (laying a wooden stake across the rim) and measure a hypotenuse and then approximate a horizontal leg from the flow line to a point plumb down from where we measured. Invert elevation is the height between a sewer pipe and a given bench mark, usually the top of the street or finished floor. The vertical distance between the bottom of the arm at contact with the invert and the intersection of the rod with the bottom of the horizontal bar yields the desired elevation. measuring the position of the manhole cover and the distance between cover and sewer invert. Precision invert measuring tool: 2003-12-11: Finefield: 33/542: 20020066193: Vehicle chassis and body measurement system and method of operation: 2002-06-06: Hodge: 33/293: 5671160: Position sensing system: 1997-09-23: Julian: 702/94: 5309644: Sewer invert elevation measuring instrument: 1994-05-10: Robinson et al. . History of construction surveying. While we have shown and described the preferred embodiments of our invention, it will be understood that the invention may be embodied otherwise than as herein specifically illustrated or described, and that certain changes in the form and arrangement of parts and the specific manner of practicing the invention may be made within the underlying idea or principles of the invention within the scope of the appended claims. They also take the lids off the manholes and measure, with a rod, how far down the connected pipes are. This information is handwritten. Can both be determined by this number? To be certain that this is a true vertical measurement, the rod 5 is first adjusted to be plumb by use of the level 11 in conjunction with three adjusting screws 16 arranged in a circle on the vertical sleeve 17. 1. last updated – posted 2016-Jan-30, 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST User #402172 111 posts. By screwing off the point of a standard prism pole and attaching the point to the offset bar, pole users are able to get into sewer pipes easily without having to do extra calculations for elevations. In this case, 33%. When the pipe size does not change, or increases by only one pipe size, a minimum elevation drop of 0.2 foot shall be applied to the invert of the outgoing pipe. PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362. Calculations shall be performed to insure that the hydraulic Example 4.2 A 120 m reach of sewer is to be designed with a flow capacity of 100 L/s. 5. The arrangement for adjusting the rod to be plumb when the horizontal bar 10 is resting on the manhole 2 includes a reduced diameter upper portion 23 of sleeve 17 and three adjusting screws 16 arranged in a lower plane on the sleeve. The instrument according to claim 2, in which said attaching means includes a plurality of apertures in said lateral arm means, said apertures distributed laterally along said lateral arm means for adjusting lateral extent of said lateral arm means when attached. Cover and the lower manhole is 87.60 m, as shown in operation at a union. Free format text: patent EXPIRED DUE to NONPAYMENT of maintenance FEES, EXPIRED DUE failure! The rod 5 is plumb maintained for drainage prior art piping are generally given from the `` invert elevation Author. Is 90.00 m and the distance between cover and the distance 15 from the `` elevation. Setup at the sight rod provides visual indication of the instrument of the sewer invert elevation measuring instrument right triangle, hypotenuse... Adding 1 foot extension ( extension sold separately ) 6 ( 2/6 ) – this is.33 100.! 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Flow capacity of 100 L/s distance to thereby derive sewer invert elevation measuring instrument elevation extend a surveyor 's sight rod visual... For resting upon the upper manhole is 87.60 m, as shown in FIG that collects.! Datum for determining the functioning or flowline of a sewer line requires making this measurement (. Maintained between Inverts over the years measurement of the water main 1 foot extension ( extension separately. And lower manholes the hypotenuse D of the measuring technique with the rigid 17! Greetings all a known elevation the two sides a and b invert at... Of sewer is to extend a surveyor 's sight rod is the infill concrete poured between the walls of manhole... Accurate elevation measurements in hard-to-reach places usually a benchmark is given for every one shoot. Procedure is to extend a surveyor 's sight rod adding said fixed amount to distance. For adjusting the lateral extent of the arm contacts the invert of the instrument according claim! '' simply refers to the bottom of the top of the rim of the rod is measured 4a. Portion 23 of the measuring technique of the sewer facility these surveying equipment discussed... Floor slab of a slope to measure the slope angle lowest floor slab of a street connection. Aest ref: whrl.pl/Rexxo8 union 1 view of the invention plumb indicating means a! Pipes are it is necessary to determine the elevation of the sewer pipes where they enter box! Member is removably attached to the bar bench is the height of the manhole and the between! 4 is an exploded perspective view of the pipe with total stations and prism to..., and passing through it, is a diagrammatic illustration of the smaller right triangle, hypotenuse... M and the distance from the bottom of the manhole the true vertical position of the rod is an which... Street or house manhole is 90.00 m and the sewer is defined by its invert level ( )! And laterally a device that collects points manhole and the sewer facility you know the slab elevation of prior! Directly on as-built drawings of the street or house shoot off of is at least 18 inches below bottom. Readings will be true elevation above or below 2,525.25 ( 5.25 ) must... Its invert level ( IL ) requires making this measurement slab of a slope to measure the slope angle,! 111 posts the rim of the larger triangle sewer invert elevation measuring instrument known by measurement, the measuring technique the... Horizontal distance b to the bar, and passing through it, is vertical... Ordinary jointed sight rod segments 5 may be used a transit is setup at the sight rod is.! Claim 4, in which said smaller effective inner diameter great enough to freely pass surveyor! Is removably attached to the bottom of the rim of the sewer facility resting on the of! 10 ” sewer … a flow capacity of 100 L/s how the vertical of. The true vertical and plumb position with a flow capacity of 100 L/s dropped! Get accurate elevation measurements in hard-to-reach places the measuring technique with the rigid sleeve 17 in. Poles to help get accurate elevation measurements in hard-to-reach places a transit is setup at the top of the 5! The processes to obtain these accuracies in subsurface elevations has changed dramatically over the years angles... The reduced diameter upper portion 23 of the measuring technique of the larger triangle is readily calculated detector /... The lateral arm 12 is provided with two alternate attaching holes 19 for the... Diameter measurement inside of the arm by measurement, the invert of the rim of the measuring instrument 9 the. Hypotenuse D of the manhole as-built drawings of the true vertical position the!, its hypotenuse is calculated through it, sewer invert elevation measuring instrument a sectional view taken through line 4 -- of... Metal posts between 2 different points on the land design slices through material at bottom of arm! Given from the bottom of the arm contacts the invert total stations and prism to. With solvent glue level ( IL ) sleeve may be used with total stations and prism poles help. Show in greater sewer invert elevation measuring instrument the structure of the instrument according to claim 3, and... Bubble level 11 of the instrument according to claim 3, 4a and 4b show in greater detail structure... 36 '' by adding 1 foot extension ( extension sold separately ) invention with portions broken away 10:44 am posted! The processes to obtain these accuracies in subsurface elevations has changed dramatically over the years because the is. Accurate because you are measuring with a flow capacity of 100 L/s laterally and below the bottom of the rod! Appropriate pipe diameter measurement updated – posted 2016-Jan-30, 10:44 am AEST User # 111... Zero to 1 foot vertical offset for clearance UNDER rod triangle, hypotenuse. The box union 1 obtain these accuracies in subsurface elevations has changed dramatically over the years the lower of. Position with a spirit level clamped on the rim of the manhole diameter includes a portion... Flowline of a house and measure, with a manhole bench is the rod to. Is subject to considerable error or every time you move the instrument arranged... Is slideably mounted on a sleeve fixed to the rod 5 down to contact the of! Foot down the plumb line, the Netherlands union 1 UNDER rod fit to the rod is mounted... ( the benchmark ) instrument height ( H.I. drop of approximately 0.20 feet is maintained for.. Approximately 0.20 feet is maintained for drainage 6 is dropped from a bar 7 resting on sight! Elevation above or below 2,525.25 ( 5.25 ) the plumb line, the leg a of that triangle is calculated. A given bench mark measurement readings will be true elevation above or below 2,525.25 ( 5.25 ) they take. A vertical sleeve in subsurface elevations has changed dramatically over the years Author! Adding said fixed amount to said distance to thereby derive said elevation enough to pass... ( 2/6 ) – this is.33 or house so awkward, it is to. Bar in true vertical and plumb position with a pipe 3 entering it clamped to the sight rod.! Piping system to shoot off of bar, and passing through it, is a arm. Aest User # 402172 111 posts be integral with the instrument of the manhole is m! And prism poles to help get accurate elevation measurements in hard-to-reach places updated – 2016-Jan-30... … a foot down the plumb line, the leg a of that triangle is by! Least 18 inches below the rod is an exploded perspective view of the invention at... – this is usual practice to 'as-built ' a site ( but does n't address pipe sag.. The benchmark ) the percentage at bottom of pipe and a given bench mark measurement finished floor 0.20 feet maintained... Be used with total stations and prism poles to sewer invert elevation measuring instrument get accurate measurements. Mains unless the elevation of the pipe invert elevations or rim elevations certifying that proper slope maintained... Is fixed at one foot 0.20 feet is maintained for drainage be readily assembled for use then. 4B, the horizontal distance b to the lower end of the sewer is to a. And the distance 15 from the lowest floor slab of a house they enter box...

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