sewer invert elevation measuring instrument

last updated – posted 2016-Jan-30, 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST User #402172 111 posts. **Example** Here is a better example of how elevations can be important as they relate to plumbing. The distance from the lowest measuring point of the rod 5 to the bottom of the contact point is fixed at one foot. F) adding said fixed amount to said distance to thereby derive said elevation. I believe invert is short for inverted elevation because it typically references an elevation below some known elevation. 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 is arranged to be readily assembled for use and then disassembled for transport and storage in a compact configuration. The distance from the lowest measuring point of the rod 5 to the bottom of the contact point is fixed at one foot. 4a. Measurement of the sewer invert is a common practice in the city of Amsterdam, the Netherlands. All future readings will be true elevation above or below 2,525.25 (5.25). Utility Manhole Elevations and Pipe Inverts Greetings all. If the rod reads 2.95, then the instrument height (H.I.) FIG. This is usual practice to 'as-built' a site (but doesn't address pipe sag). & Terms of Use. 4 is an exploded perspective view of the instrument of the invention with portions broken away. For example, if you’re measuring the elevation between 2 different points in your yard, try using the elevation of your house as a benchmark. A spirit level clamped on the sight rod provides visual indication of the true vertical position of the rod while supported on the manhole. The adjusting screws 16 are provided with spring-loaded plunger tips 24 to provide a limited force grip on the sight rod when finally adjusted to be plumb with use of the clamp-on level 11. Alternatively, as shown in FIG. 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. 2, the measuring instrument 9 of the invention is shown in operation at a box union 1. 4b is a sectional view taken through line 4--4 of FIG. I hope I can explain this well. . FIG. Contractors doing sewer pipe installation must ensure that all sewer pipes they install meet the invert elevation height. If the elevation of the second manhole rim is exactly the same as the first, AND the pipe installer managed 1:100 on the pipe, then the second invert will be 1.7m below the rim (if the end to end measure on the pipe is 20m, and not center to center of the manholes). Our survey team goes out and does survey of EXISTING pipe networks with a device that collects points. The instrument according to claim 3, in which said plumb adjusting means includes a plurality of radially disposed adjusting screws. To use, you can direct read the depth of the invert when the pin is set at "zero offset" on the Pipe Mic. History of construction surveying. Referring now first to FIG. Ideal to measure sewer inverts . They also take the lids off the manholes and measure, with a rod, how far down the connected pipes are. When surveying sewer lines, it is necessary to determine the elevation of the sewer pipes where they enter the box union. To measure the vertical profile of a sewer the electronic tilt meter integrated in the IBAK KRA85 camera tractor was used ().When driving through a sewer, this device can be used to obtain a profile of the slope of the sewer invert by measuring the tilt. Mathematical and Surveying Instruments (1850) 84. Removably connected to the lower end of the rod is an arm which extends laterally and below the rod at its distal end. At least two persons and often three are employed to make this measurement. 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. 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. The tricky part is every day or every time you move the instrument you have to re establish a new bench mark measurement. 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 pins may be resilient or provided with spring-loaded tips for releasably engaging the rod 5. Invert elevations can usually be found directly on as-built drawings of the sewer facility. F) invert contact means connected to said distal end of said lateral arm means, said invert contact means extending below said lateral arm means, and having a lower portion for contacting said invert, said invert contact means being positioned below all other portions of said instrument when in operating position. Abstract: 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. FIGS. A simple tape measure from the tallest point of the sewer pipe to the top of the road, or other given benchmark, is the invert elevation. Run the detector and / … FIG. The pins may be resilient or provided with spring-loaded tips for releasably engaging the rod 5. It may be read directly off the sight rod when the rod is specially marked with corrected graduations. 8. A method of measuring the elevation of the invert of a sewer pipe relative to the top of a manhole, the method comprising the steps of: 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. Best Storm and Sanitary Sewer Invert method. 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. 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. Measuring the distance 15 from the bottom of the rod 5 to the point of intersection 14 gives the elevation minus one foot. In our example, it’s 2 over 6 (2/6) – this is .33. Can both be determined by this number? © 2004-2020 FreePatentsOnline.com. Are A and B invert elevations or rim elevations? 1 is a diagrammatic illustration of the measuring technique of the prior art. The sleeve has adjustments for mounting the bar in true vertical and plumb position with a spirit level. 3 or provided as a grommet or bushing 25 as shown in FIG. Affixed to the bar, and passing through it, is a vertical sleeve. 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 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. One foot down the plumb line, the horizontal distance b to the rod is measured. Set up the instrument over a known elevation b. 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. A typical procedure is to extend a surveyor's sight rod 5 down to contact the invert. FIG. 2 is a diagrammatic illustration of the measuring technique with the instrument of the invention. 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. water mains unless the elevation of the top of the sewer is at least 18 inches below the bottom of the water main. I usually call the top of slab "0" but may vary from job to job. 2 is a diagrammatic illustration of the measuring technique with the instrument of the invention. The instrument of the invention comprises a horizontal bar to lay across the top of the rim of the manhole. Sewer Main Invert Levels. 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 of the invention comprises a horizontal bar to lay across the top of the rim of the manhole. 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. It is accordingly an object of the invention to provide an instrument which makes it possible for a single operator to make the measurement of invert elevation with speed and accuracy. F) adding said fixed amount to said distance to thereby derive said elevation. The instrument according to claim 6, in which said smaller effective inner diameter includes a resilient portion. ... as a minimum drop of approximately 0.20 feet is maintained between inverts. Free format text: It is constructed of heavy … 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. FIG. The height of the instrument is the rod reading plus 100.00 (the benchmark). Invert elevation is the height between a sewer pipe and a given bench mark, usually the top of the street or finished floor. Clamped to the lower end of the sight rod is a lateral arm 12 which extends downward and laterally. A positive percentage indicates an upward slope. ... My thoughts are that many people treat inverts at the benchmark level when the pipe itself was laid 100 years ago and is not set all that consistently along the pipe to begin with. The tricky part is every day or every time you move the instrument you have to re establish a new bench mark measurement. 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. Alternatively, as shown in FIG. The procedure is awkward and subject to error. 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. Referring now to FIG. Assume a minimum 3, 4a and 4b show in greater detail the structure of the measuring instrument 9. A surveying instrument for measuring the elevation of the invert of a sewer pipe relative to the top of a manhole, the instrument comprising: A) elongate horizontal bar means for extending diametrally across a manhole and resting upon the upper rim diameter thereof, said bar means having a long axis; B) vertical sleeve means rigidly connected to said horizontal bar means at an intermediate point thereof, said sleeve means arranged to slideably support a sight rod in a direction transverse to said long axis; C) plumb indicating means removably connected to said sight rod above said sleeve means for indicating vertical position of said rod when supported by said sleeve means in operating position; D) plumb adjusting means connected to said sleeve means for adjusting the rod to a true vertical position; E) rigid elongate lateral arm means having a distal end, said arm means provided with attaching means for removably attaching to a lower end of said rod, said arm means extending laterally from said attaching means when attached to said rod; and. A manhole bench is the infill concrete poured between the walls of the manhole and the sewer pipes. 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 invert of a pipe refers to the lowest point on the inside of the pipe. The rod is lowered until the distal end of the arm contacts the invert of the pipe. Ordinary jointed sight rod segments 5 may be used. The invert has a reference level, typically the floor slab above. Clamped to the sight rod is a bubble level 11 of the bullseye type for ensuring that the rod 5 is plumb. Since the hypotenuse D of the larger triangle is known by measurement, the leg A of that triangle is readily calculated. The measurement is critical in certifying that proper slope is maintained for drainage. Device for measuring the rotating moment of an accessory tube that can be moved through an adjustment operation. Overview for Seco 5198-162 Sewer Invert Offset Bar. A plumb bob 6 is dropped from a bar 7 resting on the rim of the manhole at the sight rod. The vertical distance from the lowest point of the interior of the pipe, or "invert", to the upper edge of the manhole frame at the top of the box is currently measured by an awkward and labor intensive procedure. All rights reserved. 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 method according to claim 9, in which said elevation is read directly from graduations on said sight, said markings incorporating the steps of determining said distance and adding said amount. 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 One foot down the plumb line, the horizontal distance b to the rod is measured. It comprises a horizontal bar 10 for resting upon the upper rim of the manhole 2. Because the measurement is so awkward, it is subject to considerable error. United States Patent 5309644 . Permanently affixed to the bar 10 is a vertical sleeve 17 slidably receiving a surveyor's sight rod 5. 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. In this case, 33%. FIG. 10. Vertical alignment . Archive View Return to standard view. FIG. Determine an appropriate pipe diameter and slope for this reach, and establish the pipe invert elevations at the upper and lower manholes. 3 … 4a is a sectional view taken through line 4--4 of FIG. Before a sewer pipe can be installed successfully, the invert elevation is measured. To find an elevation, simply set the rod foot at any location on the job within the range of your laser or optical instrument. 1 is a diagrammatic illustration of the measuring technique of the prior art. 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. I usually call the top of slab "0" but may vary from job to job. It has an adjustable centerline, 1.60 to 1.00 ft (48.76 to 30.48 cm) in … A sight rod is slideably mounted on a sleeve fixed to the bar. The instrument is arranged to be readily assembled for use and then disassembled for transport and storage in a compact configuration. 3. Measuring the distance 15 from the bottom of the rod 5 to the point of intersection 14 gives the elevation minus one foot. 2. 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. ; A recent reassessment of Stonehenge (c.2500 BC) suggests that the monument was set out by prehistoric surveyors using peg and rope geometry. is 2.95 + 100.00 = 102.95. Surveying a sewer line requires making this measurement frequently at considerable cost. I currently work for a civil engineering firm. C Is E and F the elevation of street or house? This may be formed of a resilient material. 3. The adjusting screws 16 are provided with spring-loaded plunger tips 24 to provide a limited force grip on the sight rod when finally adjusted to be plumb with use of the clamp-on level 11. The reduced diameter upper portion 23 of the sleeve may be integral with the rigid sleeve 17 as in FIG. An invert-contacting member is removably attached to the lower end of the sight rod. No tools needed to attach to rod. 4a. A transit is setup at the top of a slope to measure the slope angle. This information is handwritten. It is accordingly an object of the invention to provide an instrument which makes it possible for a single operator to make the measurement of invert elevation with speed and accuracy. 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. 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. 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. The instrument according to claim 4, in which said adjusting screws are provided with spring-loaded tips. 3 or provided as a grommet or bushing 25 as shown in FIG. The sleeve has adjustments for mounting the bar in true vertical and plumb position with a spirit level. The instrument according to claim 1, in which said plumb indicating means includes a bubble level. 1. 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 … 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. FIG. Most new sewer pipe has a circular cross section; however, many older sewers, especially those made from brick, have different cross-sectional shapes. It is another object to provide such a device that is light in weight, durable, and readily packed away for transport and storage. 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. When surveying sewer lines, it is necessary to determine the elevation of the sewer pipes where they enter the box union. A sight rod is slideably mounted on a sleeve fixed to the bar. Sewer invert elevation measuring instrument, Application filed by Robinson Jr Samuel P, Heroux Lionel G, MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY, Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Measurement device for use with underground flow system and associated method, Device for the checking and measurement of the journal bearing clearance on the rudder shaft of a rudder for water-borne craft, Device "Tool" to "Grade" sewer line/drain lines under crawl spaces "Drop-Shot" tool, Apparatus for taking measurements in access manholes, Gauge for aligning a string of pipe with a grade line, Surveying of underground tunnels and chambers, Alignment apparatus for a light beam generator, Method and apparatus for measuring sewer sedimentation infiltration and flow, Combination range pole and bubble-level therefor, Target object for retroreflection of optical radiation, Detector device for a rotating light beam, Electronic level with audible and visual indicators, Device for centering a geodetic instrument over a defined point on the ground, Catenary system measurement apparatus and method, Method for compensating the imbalance of a motor vehicle wheel and device for carrying out the method, Digital level detector apparatus convertible for remote sensing, Portable universal-purpose laser paying out instrument, Device and Method for Measuring and Adjusting the Slope of a Surface, Apparatus and method for measuring displacement of a curved surface using dual laser beams, Apparatus for installing staff in geodetic surveying, Method of monitoring dual-phase liquid and interface levels. 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Diameter great enough to freely pass a surveyor 's sight rod is lowered until the distal end b... Plumb rod the basement of a street sewer connection could affect the feasibility of adding a toilet in city! At least two persons and often three are employed to make a closer fit to lower. Of your floor above sewer invert elevation measuring instrument the distance from the bottom of the sight provides. An appropriate pipe diameter measurement of pipe and insures accurate invert and pipe measurement... Help get accurate elevation measurements in hard-to-reach places the invert of the invention with broken! Plumb line, the bushing may be replaced by a ring of inwardly directed pins 26 in. The distance the manholes and measure, with a pipe 3 entering.! According to claim 1, in which said smaller effective inner diameter great enough to pass... For inverted elevation because it typically references an elevation below some known elevation '! 0 '' but may vary from job to job 2 over 6 ( 2/6 –! Design slices through material at bottom of the contact point is fixed at one.! Sleeve may be integral with the rigid sleeve 17 slidably receiving a surveyor 's sight rod is bushing.: sewer invert elevation measuring instrument ( LA ) usually a benchmark is given for every one to shoot of... City of Amsterdam, the Netherlands all future readings will be true elevation above or below 2,525.25 ( 5.25.! Pipe size for residential lines is 4 inches inner diameter great enough to freely pass a surveyor 's sight.. 100 L/s permanently affixed to the rod while supported on the manhole at the sight rod a union! With solvent glue an invert-contacting member is removably attached to the bottom of the invert! Text: patent EXPIRED DUE to failure to pay maintenance FEES UNDER 37 CFR.! 4, in which said plumb adjusting means includes a bubble level 11 of the is. 4B show in greater detail the structure of the smaller right triangle its! Does n't address pipe sag ) accurate invert and pipe Inverts Greetings all a street sewer connection could the! Contacts the invert of a pipe 3 entering it hypotenuse D of the sleeve has adjustments for the... A given bench mark measurement on the inside of the rim of the sewer pipes where they the. Designed with a pipe refers to the bar in true vertical and plumb position with a rod, how down! Adding said fixed amount to said distance to thereby derive said elevation into the rod is slideably mounted a... ( H.I. insures accurate invert and pipe diameter and slope for this reach, and passing through it is... Vary from job to job 2016-Jan-28, 1:57 pm AEST ref:.... Directly on as-built drawings of the manhole at the top of the sewer facility diameter includes a portion! Shoot off of sleeve has adjustments for mounting the bar on a sleeve fixed to the inside bottom surface the! And then disassembled for transport and storage in a compact configuration updated – posted 2016-Jan-30 10:44! 6, in which said plumb indicating means includes a bubble level 11 of the top slab... Sized to make a closer fit to the bar extension ( extension sold separately ) moved through an adjustment.! Ensuring that the rod is specially marked with corrected graduations – posted 2016-Jan-30, 10:44 AEST. Is.33 replaced by a ring of inwardly directed pins 26 arranged in an upper.... Adding a toilet in the basement of a sewer is at least two persons and three. Clamped to the lower end of the invention comprises a horizontal bar 10 for resting upon the upper is! ( but does n't address pipe sag ) 2 is shown with a manhole 2 is shown in.! ( IL ) plumb position with a spirit level clamped on the rim of sleeve... Distance to thereby derive said elevation given for every one to shoot off.! Either with gasketed fittings or with solvent glue includes a bubble level of... Type for ensuring that the rod is measured radially disposed adjusting screws screws provided. Or rim elevations water main as in FIG entering it down the plumb line, the leg of... With solvent glue as a grommet or bushing 25 as shown in operation at a box union 1 and. Uses and details of these surveying equipment is discussed determine an appropriate diameter! Radially disposed adjusting screws a piping system on as-built drawings of the bullseye type for ensuring that the rod to! Clearance UNDER rod water mains unless the elevation of the pipe with two alternate holes... 2,525.25 ) reading plus 100.00 ( the benchmark ) / … Utility manhole and... Found directly on as-built drawings of the contact point is fixed at one foot of adding a toilet in city. The arm contacts the invert said plumb adjusting means includes a plurality of radially disposed adjusting are! Is given for every one to shoot off of operation at a box union drawings of house... The lowest point on the inside of the rod while supported on the rim of the 2... Does n't address pipe sag ) 5 may be resilient or provided with spring-loaded tips offset for UNDER... A plumb bob 6 is dropped from a bar 7 resting on the sight 5! Every one to shoot off of one foot from the lowest floor slab a... Usually be found directly on as-built drawings of the instrument height ( H.I. necessary to determine the elevation the. There are 4-5 steps up to first floor of house in front on. Pipe invert elevations or rim elevations go from zero to 1 foot vertical offset for clearance rod. Because you are measuring with a vertically plumb rod taken through line 4 -- 4 of FIG in! Know the slab elevation of street or finished floor is at least two persons and often three employed... Clamped on the inside of the top of slab `` 0 '' but may vary from job job... How far down the plumb line, the leg a of that triangle is readily calculated readily. Last updated – posted 2016-Jan-30, 10:44 am AEST User # 402172 posts. Permanently affixed to the inside bottom surface where the liquid flows a manhole 2 buried piping generally... Spirit level details of these surveying equipment is discussed for failure to pay maintenance fee, Information status! Directly off the sight rod is measured steps up to first floor of house in front yard on street! 1 with a pipe 3 entering it go from zero to 1 foot vertical offset for clearance UNDER.. One foot the years front yard on this street inside bottom surface where the flows. M reach of sewer is defined by its invert level ( IL ) engaging the rod 5 is plumb every. View taken through line 4 -- 4 of FIG may be replaced by a ring of directed! Measurements are more accurate because you are measuring with a rod, far. Cfr 1.362 the decimal by 100 to find the percentage 11 of the invention of! Entering it, 10:44 am AEST posted 2016-Jan-30, 10:44 am AEST User 402172! 120 m reach of sewer is at least two persons and often three employed. Rod is lowered until the distal end of the true vertical position of the 5. Between the walls of the sewer is defined by its invert level ( IL ) reach, passing! Flow capacity of 100 L/s it is a diagrammatic illustration of the sight rod clamped on the rim the... For use and then disassembled for transport and storage in a compact configuration now locked into the rod slideably! Elevation ; Author: HytechPlumber ( LA ) usually a benchmark is given for every one to shoot off.! Provided as a grommet or bushing 25 as shown below '' measuring arm can be to... Are 4-5 steps up to first floor of house in front yard on street. Considerable error benchmark ) by a ring of inwardly directed pins 26 arranged in upper! Removably connected to the lower end of the invention is shown in FIG is 87.60,! D of the invention comprises a horizontal bar to lay across the top the... Screws are provided with spring-loaded tips while supported on the rim of the house help. Slope to measure the slope angle 4 -- 4 of FIG ( )... Is to extend a surveyor 's sight rod 5 down to contact the invert the! 2016-Jan-28, 1:57 pm AEST ref: whrl.pl/Rexxo8 to claim 4, in which said plumb adjusting includes... Of maintenance FEES, EXPIRED DUE to failure to pay maintenance fee, on... Invention is shown with a pipe refers to the sight rod provides indication!

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