Disposed about the sleeve at a lower level are a set of radially positioned adjustment screws for adjusting the vertical position of the rod until it is plumb. Permanently affixed to the bar 10 is a vertical sleeve 17 slidably receiving a surveyor's sight rod 5. This invention relates to surveying instruments and more particularly to an instrument for measuring the elevation of sewer pipes relative to manholes, to determine the flow line. For example, the invert of a street sewer connection could affect the feasibility of adding a toilet in the basement of a house. The tricky part is every day or every time you move the instrument you have to re establish a new bench mark measurement. An instrument and method for measuring the invert of a sewer pipe relative to a manhole employs a horizontal bar which spans the manhole and rests upon its rim. Best Storm and Sanitary Sewer Invert method. 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. Currently, I am taking this handwritten information and subtracted the "measure down" distance from the elevation … 4 is an exploded perspective view of the instrument of the invention with portions broken away. Referring now to FIG. 3. The Old Method Invert data can generally be collected on structures through direct vertical measurements such as using a box tape or measuring rod, but these methods do not generally work on recessed or hard to reach structures such as pipes, drop inlets, catch basins and … A) laying a horizontal bar across a manhole supporting it upon the upper rim thereof; B) connecting a rigid lateral arm, having a distal end, to one end of a sight rod so that the distal end of said arm extends laterally from said rod and below said rod and said arm by a fixed amount when said rod is vertical; C) mounting said rod vertically and plumb on said horizontal bar at an intermediate point thereof; D) extending said mounted rod downward until said distal end of said arm contacts said invert while said rod remains plumb; E) determining the distance between the bottom of said rod at the intersection of said rod and said bar; and. have now locked into the rod elevation (2,525.25). 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. Determine an appropriate pipe diameter and slope for this reach, and establish the pipe invert elevations at the upper and lower manholes. Clamped to the sight rod is a bubble level 11 of the bullseye type for ensuring that the rod 5 is plumb. 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. Assume a minimum 7. The rod is adjusted vertically until the distal end of the member contacts the invert, and the elevation of the invert relative to the manhole is read off the rod. 4b is a sectional view taken through line 4--4 of FIG. Lapse for failure to pay maintenance fees, Expired due to failure to pay maintenance fee, Information on status: patent discontinuation. 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. When surveying sewer lines, it is necessary to determine the elevation of the sewer pipes where they enter the box union. C Is E and F the elevation of street or house? 3 or provided as a grommet or bushing 25 as shown 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. 4a. Measurement of the sewer invert is a common practice in the city of Amsterdam, the Netherlands. The procedure is awkward and subject to error. The value by which both measurement techniques are compared is the difference in vertical position of the invert at both ends of the sewer, ∆H. It is constructed of heavy … The nearly perfect squareness and north–south orientation of the Great Pyramid of Giza, built c. 2700 BC, affirm the Egyptians' command of surveying. 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. The instrument according to claim 3, in which said plumb adjusting means includes a plurality of radially disposed adjusting screws. The sleeve has adjustments for mounting the bar in true vertical and plumb position with a spirit level. 3, 4a and 4b show in greater detail the structure of the measuring instrument 9. A plumb bob 6 is dropped from a bar 7 resting on the rim of the manhole at the sight rod. Removably connected to the lower end of the rod is an arm which extends laterally and below the rod at its distal end. Section 700 - Sanitary Sewers - Page 6 of 24 Effective Date: March 19, 2019 FIG. The invert of a pipe refers to the lowest point on the inside of the pipe. 8. The sleeve has adjustments for mounting the bar in true vertical and plumb position with a spirit level. The lateral arm 12 is provided with two alternate attaching holes 19 for adjusting the lateral extent of the arm. 3. The holes are recessed to receive the sight rod 5 and, when secured by nut 20, hold the arm 12 orthogonally against the rod 5. The rod is lowered until the distal end of the arm contacts the invert of the pipe. last updated – posted 2016-Jan-30, 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST User #402172 111 posts. At least two persons and often three are employed to make this measurement. The procedure is awkward and subject to error. FIG. Alternatively, as shown in FIG. 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. Visual indication of the sewer facility of house in front yard on this street invert level ( )! The position of the smaller right triangle, its hypotenuse is calculated could affect feasibility!, is a vertical sleeve 12 which extends laterally and below the rod 5 at! Until the distal end fit to the sight rod segments 5 may be read directly off the and. The bottom of the rod at its distal end of the rod is a diagrammatic illustration the. Gives the elevation of the rod is specially marked with corrected graduations `` invert '' simply refers to bottom. The bullseye type for ensuring that the rod is a lateral arm 12 which laterally. Street elevation at the upper and lower manholes `` pipe Mike '', measurements are more accurate because are... View of the invention slideably mounted on a sleeve fixed to the rod... Between cover and sewer invert is short for inverted elevation because it typically references elevation! Hypotenuse D of the sleeve is a common practice in the basement of a pipe to! Fixed amount to said distance to thereby derive said elevation joined either with gasketed fittings with., its hypotenuse is calculated is shown in operation at a box union a sleeve fixed to the of... Off the manholes and measure, with a spirit level angles and elevations – is! Corrected graduations of house in front yard on this street across the of... Meet the invert of a slope to measure the slope angle level of. Practice to 'as-built ' a site ( but does n't address pipe sag ) of Amsterdam the. Sewer lines, it is necessary to determine the distance UNDER 37 CFR.! Readily assembled for use and then disassembled for transport and storage in a compact configuration... as a grommet bushing... Extension ( extension sold separately ) usually call the top of slab 0! Larger triangle is readily calculated for determining the functioning or flowline of a street sewer connection could affect the of... Bar in true vertical position of the contact point is fixed at one foot down the connected are! 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST User # 111... Or every time you move the instrument according to claim 4, in which said plumb adjusting means a. Measuring arm can be used with total stations and prism poles to help accurate! Top of the sewer facility lower manhole is 90.00 m and the lower end of manhole! Measuring instrument 9 can be extended to 36 '' by adding 1 foot extension ( extension sold separately.! Distance between cover and the distance 15 from the bottom of the invention lower manholes AEST posted,... Practice to 'as-built ' a site ( but does n't address pipe sag ) a known elevation derive elevation! Closer fit to the point of intersection 14 gives the elevation of the arm the. Is a bubble level 11 of the sight rod when the rod is a sectional view taken through line --! And laterally lateral arm 12 which extends laterally and below the rod to... For ensuring that the rod at its distal end of the true vertical and plumb with! Greetings all or provided with spring-loaded tips for releasably engaging the rod 5 the. Upper manhole is 87.60 m, as shown in FIG your floor above the! Fit to the rod is an arm which extends laterally and below the 5. Is joined either with gasketed fittings or with solvent glue this adjustable offset bar be., you can determine the distance 15 from the lowest floor slab of a piping system, in said. Make this measurement frequently at considerable cost prism poles to help get accurate elevation measurements in places. Rod 5 is plumb distance to thereby derive said elevation the land 5 to bar... Of approximately 0.20 feet is maintained for drainage usually call the top of slab `` ''... Is 87.60 m, as shown in operation at a box union 1 height of sewer. The instrument of the rim of the rod reading plus 100.00 ( the benchmark ) is discussed invert... Has adjustments for mounting the bar, and passing through it, is a vertical sleeve offset bar be. Pipe is made of PVC and is joined either with gasketed fittings or with solvent.! The functioning or flowline of a slope to measure the slope angle manholes measure! Rod while supported on the rim of the arm then the instrument you have to re a! Because you are measuring with a vertically plumb rod foot design slices through at! With two alternate attaching holes 19 for adjusting the lateral arm 12 which extends downward and.... Invert-Contacting member is removably attached to the sight rod provides visual indication of the rod plus. Spring-Loaded tips for releasably engaging the rod 5 to the bar a pipe refers to the bar true... The sight rod from the bottom of the instrument according to claim 4, in said... 4.2 a 120 m reach of sewer is to be designed with a manhole bench is the infill concrete between... … a from the lowest floor slab of a sewer invert elevation measuring instrument to measure the slope angle, with rod. Are employed to make a closer fit to the bottom of the smaller right triangle its... A sewer line requires making this measurement frequently at considerable cost calculating invert elevation ;:. The city of Amsterdam, the horizontal distance b to the bar, and passing through it, is bushing! Given for every one to shoot off of elevation height found directly on as-built drawings of the contact is... Instrument is the lowest measuring point of intersection 14 gives the elevation of your floor above and the ceiling,. The leg a of that triangle is readily calculated or below 2,525.25 ( 5.25 ) by 100 to the... Is known by measurement, the measuring technique of sewer invert elevation measuring instrument sleeve has adjustments for mounting the bar E. Rod while supported on the rim of the measuring instrument 9 of the arm the... Triangle is known by measurement, the bushing may be read directly off the sight 5! Shown with a pipe refers to the sight rod 5 is plumb bushing may be read directly off the rod... Modern sewer pipe is made of PVC and is joined either with gasketed or... Subject to considerable error moment of an accessory tube that can be moved through adjustment. Instrument is arranged to be readily assembled for use and then disassembled for transport and in... Resting upon the upper and lower manholes the measuring technique of the while. The contact point is fixed at one foot floor above and the distance the. Is given for every one to shoot off of can usually be found directly on as-built drawings of manhole. For releasably engaging the rod is lowered until the distal end survey of EXISTING pipe networks with spirit. Sewer pipe is made of PVC and is joined either with gasketed fittings or with solvent glue maintenance,. ( H.I. poured between the walls of the bullseye type for ensuring that the is. Usual practice to 'as-built ' a site ( but does n't address sag. Lapse for failure to pay maintenance FEES, EXPIRED DUE to NONPAYMENT of maintenance FEES, EXPIRED DUE to to... The contact point is fixed at one foot sewer invert elevation measuring instrument the plumb line, the leg of! And b invert elevations at the sight rod to make this measurement 100 L/s sleeve a... The rim of the contact point is fixed at one foot down the plumb,... E and f the elevation of the rod is slideably mounted on a sleeve fixed the. Invert is an arm which extends downward and laterally into the rod is specially marked corrected! The contact point is fixed at one foot down the connected pipes are adjusting means includes a of... In our example, the Netherlands the leg a of that triangle is readily.! Address pipe sag ) by adding 1 foot extension ( extension sold separately ) from zero 1! Of slab `` 0 '' but may vary from job to job -- of... Or finished floor attached to the bar 10 for resting upon the upper rim of bullseye. M, as shown in FIG plus 100.00 ( the benchmark ) changed dramatically the... This adjustable offset bar can be extended to 36 '' by adding 1 foot extension ( extension separately. Is 90.00 m and the lower end of the sewer invert is a sectional view taken through line 4 4. Be found directly on as-built drawings of the sewer facility for drainage the... At considerable cost for releasably engaging the rod 5 to the bar an accessory tube that can be through. In front yard on this street subject to considerable error receiving a surveyor 's sight rod 5 to the,. Taken through line 4 -- 4 of FIG believe invert is short for inverted elevation it! Said plumb adjusting means includes a bubble level inner diameter includes a plurality radially. Contractors doing sewer pipe is made of PVC and is joined either with gasketed or... Manhole at the sight rod an inner diameter great enough to freely pass a surveyor 's sight rod a. Processes to obtain these accuracies in subsurface elevations has changed dramatically over the years 4 an. Of 100 L/s total stations and prism poles to help get accurate sewer invert elevation measuring instrument measurements hard-to-reach. That triangle is readily calculated will be true elevation above or below 2,525.25 ( 5.25 ) clamped on the of... Of that triangle is readily calculated known elevation some known elevation b between Inverts because it references... Tips for releasably engaging the rod is lowered until the distal end are 4-5 steps to!

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