WO2003097260A1 - Interior sewer pipeline scarifying apparatus - Google Patents
Interior sewer pipeline scarifying apparatus Download PDFInfo
- Publication number
- WO2003097260A1 WO2003097260A1 PCT/CA2003/000704 CA0300704W WO03097260A1 WO 2003097260 A1 WO2003097260 A1 WO 2003097260A1 CA 0300704 W CA0300704 W CA 0300704W WO 03097260 A1 WO03097260 A1 WO 03097260A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- scarifying
- sewer pipe
- coupled
- rail assembly
- assembly
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F9/00—Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/043—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes
- B08B9/0433—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved by externally powered mechanical linkage, e.g. pushed or drawn through the pipes provided exclusively with fluid jets as cleaning tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/049—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled
- B08B9/051—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled the cleaning devices having internal motors, e.g. turbines for powering cleaning tools
Definitions
- the present invention relates to a device for cleaning the interior surface of a pipe and more specifically for cleaning the interior surface of a sewer pipe.
- the interior surface of a pipeline carrying solids, liquids and gases generally degrades over time as the pipe walls interact chemically and physically with the substances flowing through them and air.
- a sewer system's interior walls corrode and deteriorate because corrosive materials contaminate the surface, degrading the metal and concrete used to build the sewer pipe.
- the corrosive material arises from both the sewage and waste water itself, and also from the digestible by-products of bacteria found in the sewage which proliferate in the anaerobic environment. The corrosion causes the walls of the sewer pipe to physically decay, eventually reducing their overall thickness .
- the principle source of corrosion is sulfuric acid, which arises as a product of the reaction of sewer gases with water and air in the sewer pipe and the sewer environment itself.
- Various metal sulfates found in the sewage quickly convert into hydrogen sulfide by reducing to sulfide ions in the waste water, combining with hydrogen in water and outgassing above the liquid as hydrogen sulfide gas.
- Additional hydrogen sulfide originates from bacteria-containing contaminants which accumulate on the relatively rough concrete below the maximum liquid level. Bacteria found in these accumulations thrive in the anaerobic sewer environment producing hydrogen sulfide gas as a respiratory by-product.
- the sulfuric acid attacks the calcium- hydroxide in the concrete sewer walls leaving calcium sulfates which ultimately crumble and fall •off the interior of the wall substantially reducing its thickness .
- the waste water level varies over the course of a 24-hour period.
- the flow is at its lowest level between 1:00 a.m. and 6:00 a.m. in the morning but it rises distinctly in the daytime when the pipe may operate near capacity.
- the pipe walls are predominately corroded in the portions of the wall above the minimum liquid level. Portions of the walls which are always below the water level are not subjected to such high concentrations of hydrogen sulfide gas or sulfuric acid and consequently do not experience the same level of decay.
- the restoration process is a two-step operation that consists of first scarifying the interior pipe surface to remove the contaminants (including any possibly existing outer layers of corrupted concrete) from the surface of the pipe, i.e. a process herein defined as scarifying, and then applying a protective coating over the newly cleaned (scarified) pipe surface.
- a protective coating without first scarifying the pipe surface is futile because it does not stop the decay that has already begun underneath the coating.
- the protective coating itself does not adhere well to the contaminated surface.
- scarifying is an essential element of the restoration process.
- the sewer typically operates at high capacity during the day with a decreased flow overnight.
- a bulk of the work must be done at night during the brief period when the flow is at a minimum.
- the restoration process involves both scarifying the pipe surface and applying a protective coat.
- the rate of restoration is impaired because manual scarifying takes a proportionally greater amount of time than does the application of the protective coat.
- Automated scarifying processes exist, e.g. MacNeil et al above, however, presently devices require insertion into the sewer assembly and then removal ' from the sewer, all during the brief period when the sewer flow is at a minimum. Consequently, a need exists for an automated scarifying or restoration apparatus that can remain in the sewer during the period when the waste water level is not at a minimum.
- the present invention relates to an apparatus for scarifying the interior surface of a sewer pipe.
- a rail assembly matching the circumferential shape of the sewer pipe interior is connected at its ends to a chassis moveable along the bottom half of the sewer pipe.
- the rail assembly will be of an arcuate configuration.
- the rail assembly of the present invention will be easily removed from the chassis to allow entry and removal of the apparatus through small openings, such as manholes, into the sewer .
- At least one scarifying head is coupled to the rail assembly and may traverse in either direction along the rail assembly.
- the scarifying head comprises a nozzle assembly and a driving assembly.
- the nozzle assembly includes nozzles which rotate or oscillate, and emit a pressurized jet of fluid to scarify a circumferential swath of the interior surface of the sewer pipe.
- the driving assembly enables the scarifying head to move back and forth along the rail assembly.
- the scarifying head may be extendible to place the nozzles proximate the interior surface of the sewer pipe when the scarifying head is at rest or as it moves back and forth along the rail assembly.
- the present invention may also include guide bars affixed to the chassis.
- the guide bars may have wall-engaging attachments, which move along the interior surface of the sewer pipe and maintain the orientation of the apparatus along a longitudinal axis of the pipe when the apparatus is in use.
- An advantage of present invention is improved rates of scarifying of the sewer pipe's interior walls.
- a further advantage is assurance that the same intensity of scarifying is applied to the entire surface without the quality variation that is inherent in manual execution.
- the ability of the scarifying head to traverse in either direction of the rail assembly enables a circumferential swath of the interior surface of the sewer pipe to be scarified without requiring the apparatus to make 'several passes back and forth, resulting in a fast and cost-effective method of scarifying, and making restoration without diversion a cost-effective possibility.
- this feature results in an increase in productive working time for scarifying the interior surface of the sewer pipe when the sewer flow is at a minimum.
- Figure 1 is a perspective view of a first embodiment of the apparatus showing a vehicle, carts, rail assembly, and scarifying heads ;
- Figure 2 is a front view of the scarifying head of the first embodiment
- Figure 3 is a front view of a second embodiment showing the configuration of the apparatus when it is in use;
- Figure 4 is a sectional view along line 4-4 of Figure 3 ;
- Figure 5 is a sectional view along line 5-5 of Figure 4;
- Figure 6 is a top view of the second embodiment showing the track assembly and removable platform;
- Figure 7 is a side view of the track assembly and lateral support for the second embodiment;
- Figure 8 is a perspective view of the interior of a cylindrical pipe depicting a circumferential swath scarified by a pass of the apparatus.
- a scarifying apparatus 10 includes at least one scarifying head 20 slidably mounted between two arcuate, spaced apart rails 12 and 14.
- the scarifying head 20 is mounted with a pair of low friction brackets or plates 18 slidably engaging the edges of the rails 12 and 14.
- a rack 16 is mounted on the underside of one of rails 12 and 14 and a small reversible hydraulic motor 22 mounted on the scarifying head 20 drives a pinion gear 26 which, in turn, engages the teeth of the rack 16, causing the scarifying head 20 to move along the rails 12 and 14.
- a pair of outwardly directed nozzles 28 each connected to a respective branch 30, with each branch coupled to an exchanger 32 which receives a single stream of fluid and splits it into two streams of equal flow rate for each of the two nozzles 28.
- An inlet 31 at another end of the scarifying head 20 is engaged by a hose end 34 and conducts water to the exchanger 32.
- Inlet and outlet hydraulic hoses 36 and 37 respectfully attach to hydraulic couplings on the hydraulic motor 22.
- the exchanger 32 is mounted at the distal end of a telescoping arm, which includes two telescoping pipes in which the upper portion of the pipe 21 has a smaller diameter such that it slides down the lower portion 23.
- a piston (not shown) controls the extension of the telescoping arm. Consequently, the scarifying head 20 can be manipulated so that the outwardly directed nozzles 28 can be positioned in close proximity to the pipe walls when the scarifying head 20 is at rest or as the scarifying head 20 moves back and forth along the rails 12 and 14.
- One set of the ends of the rails 12 and 14 are affixed to a small cart 38A positioned at one side of the sewer pipe to be cleaned, while the other set of the ends of the rails 12 and 14 are affixed to another small cart 38B positioned on the other side of the sewer pipe to be cleaned.
- Each of carts 38A and 38B have mounted thereon a guide roller 40A and 40B which prevents the cart from scraping against the side of the sewer pipe when the apparatus 10 is in use.
- Carts 38A and 38B are affixed by rigid rods 42A and 42B, respectively, to a small vehicle 44 powered by hydraulic motors (not shown) to move the rails 12 and 14 and carts 38A and 38B along the sewer pipe, while keeping the rails 12 and 14 transverse to the direction of travel.
- a hydraulic motor is used in this embodiment, any power providing means of both external or on-board types but preferably exhaustless may be used for this application.
- the direction of motion of the vehicle is that of arrow 58.
- an additional rigid rod 42C is connected to rods 42A and 42B as shown to keep the latter rods from moving towards each other.
- Rails 12 and 14 can accommodate several scarifying heads 20 at the same time.
- the scarifying heads 20 are positioned so that each travels back and forth along the rails 12 and 14 the same distance, with the net result being that together the scarifying heads 20 cover the entire circumference of the rails 12 and 14.
- a controller 62 mounted adjacent to motor 22 receives a signal from a position sensor (not shown) which senses the position of the scarifying heads 20 and is responsive to command signals received from controller 62 to establish the trajectories of the scarifying heads 20 along the rails 12 and 14. For example, if three scarifying heads were used, each scarifying head 20 would usually be set to traverse approximately 1/3 of the circumference of the rails 12 and 14 by each traveling in one direction until the end of a respective path is reached and the opposite to coyer the same path in an opposite direction.
- Vehicle 44 includes a chassis 70 # a track assembly 68 and an on-board hydraulic motor (not shown) .
- a track assembly 68 is shown in this embodiment, any actuator capable of moving the vehicle 44 under power from the hydraulic motor may be used.
- the hydraulic motor 22 is coupled by hydraulic hoses 36 and 37 that pass through a manhole (not shown) to an external hydraulic pump (not shown) .
- An electrical cable from an external generator (not shown) also feeds through the manhole and couples electrical power to the vehicle 44.
- An on-board power supply converts this electrical power to low voltage DC for application to the various switches in response to commands from an on-board controller (not shown) . The switches control the speed and direction of the vehicle 44.
- An on-board battery (not shown) can also power the electrical system which controls the speed and direction of the vehicle 44 as well as the movement of the scarifying heads 20.
- the hydraulic motor 22, switches, and on-board power supply are covered by protective boxes (not shown) to protect their sensitive parts from debris when the waste water level when is not at a minimum.
- the vehicle 44 and carts 38A and 38B are outfitted with a drawbar (not shown) which holds the hoses away from the apparatus so that it may easily travel in either direction without running over the hoses.
- the drawbar may also hold the hoses close to the apparatus to enable debris to flow more easily through the sewer pipe when the apparatus is not in use.
- An additional safety feature not shown in the drawings is a "deadman" , which is a safety switch operative to cut off the high pressure from the moving parts of the apparatus.
- the deadman is useful in both emergency situations and when minor adjustments must be made to the apparatus during a job.
- the rails 12 and 14 may easily be removed from the carts 38A and 38B to enable the apparatus to enter small access opening into the sewer pipe. Once assembled, the configuration of the apparatus enables it to remain in the sewer pipe for the duration of the restoration.
- a second embodiment of the scarifying apparatus 10 includes at least one scarifying head 20 slidably mounted between two arcuate, spaced apart rails 12 and 14. At an outer end of the scarifying head 20 is mounted a pair . of outwardly directed nozzles 28 each connected to a corresponding branch 30, with each branch coupled to an exchanger 32 which receives a single stream of fluid and splits it into two streams of equal flow rate for each of the two nozzles. An inlet at another end of the scarifying head 20 is received by a hose end 34 and conducts water to the exchanger 32.
- the exchanger 32 is mounted at the distal end of a telescoping arm, which includes two telescoping pipes in which the upper portion of the pipe 21 has a smaller diameter such that it slides down the lower portion 23.
- a piston (not shown) controls the extension of the telescoping arm. Consequently, the scarifying head 20 can be manipulated so that the outwardly directed nozzles 28 can be positioned in close proximity to the pipe walls when the scarifying head 20 is at rest or as the scarifying head 20 moves back and forth along the rails 12 and 14.
- a pulley system is used to move the scarifying head 20 along the rails 12 and 14.
- the pulley system is shown for a scarifying system having two scarifying heads 20.
- the ends of a fixed length of cable 94A and 94B are attached to either side of a carriage 87 of the scarifying head 20.
- a sheave 81 is attached to each side of the carriage
- the hydraulic motor 71 is suspended from the rail assembly 12 by a rigid pole 75.
- the hydraulic motor 71 causes the motor controlled sheave 72 to rotate, which, in turn causes the cable 94A and 94B to move over the motor controlled sheave 72, and sheaves 88 and 81, which results in the scarifying heads 20 moving along the rails 12 and 14.
- Inlet and outlet hydraulic hoses 71A and 71B attach to hoses coupling on the hydraulic motor 71.
- a chain passing over the rim of the sheaves 72 and 81 may be used.
- One set of the ends of the rails 12 and 14 are affixed to socket 74A at one side of the track assembly 68, while the other set of the ends of the rails 12 and 14 are affixed to- another socket 74B positioned on the other side of the track assembly 68.
- the rails 12 and 14 may easily be removed from the sockets 74A and 74B to enable the apparatus to enter small access opening into the sewer pipe.
- a platform 82 is located between the track assemblies 68 to keep the track assemblies transverse to the direction of travel.
- the track assemblies 68 are powered by hydraulic motors 86 to move the rails 12 and 14 along the sewer pipe.
- Inlet and outlet hydraulic hoses 86A and 86B attach to hoses coupling on the hydraulic motors 86.
- hydraulic motors 86 and 71 any power providing means of both external or on-board types, but preferably exhaustless may be used for this application.
- a battery 78 and a hydraulic solenoid 80 are mounted on the platform 82. Referring to Figure 6, the platform 82 may be removed from the chassis 51 of the track assemblies 68 by pins 84A, 84B, 84C, and 84D to protect the battery 78 and hydraulic solenoid 80, as well as to improve waste water flow through the sewer pipe when it is not at a minimum.
- limit switches 76A and 76B are also removably mounted to the chassis 51 by pins 75A and 75B. The configuration of the apparatus enables the remaining portions of the apparatus to remain in the sewer pipe for the duration of the restoration.
- the hydraulic motors 86 and 71 are coupled through hydraulic hoses to the hydraulic solenoid 80 and to an external hydraulic pump (not shown) .
- the battery 70 powers the electrical system for application to the various switches. Alternately, an electrical cable from an external generator (not shown) may be used to couple electrical power to the scarifying apparatus 10.
- the limit switches 76A and 76B send signals to an on-board controller (not shown) coupled to the hydraulic solenoid 80 to cause the scarifying heads to change their speed and/or direction along the rails via the hydraulic motor 71.
- each scarifying head 20 would usually be set to traverse approximately 1/2 of the circumference of the rails 12 and 14 by each traveling in the same direction until one scarifying head 20 reached the end of a respective path where one of the limit switches 76A and 76B is located, and then reversing direction until signaled by the other limit switch 76A and 76B to change direction again. While the limit switches 76A and 76B control the direction of the scarifying heads 20, switches (not shown) also send signals to the on-board controller (not shown) to control the direction of the track assemblies 68 via the hydraulic solenoid 80.
- An additional safety feature not shown in the drawings is a "deadman", which is a safety switch operative to cut off the high pressure from the moving parts of the apparatus.
- the deadman is useful in both emergency situations and when minor adjustments must be made to the apparatus during a job.
- a lateral support 53 is attached to the rails 12 and 14 and chassis by a socket 55 on each side of the track assemblies 68.
- the lateral support may easily be removed from the rails 12 and 14 when the scarifying apparatus 10 is not in use.
- an apparatus with an arcuate rail assembly will be preferred when the sewer pipe is a semicircular shape.
- the arcuate rail assembly may also be used in a cylindrical pipe by using a false floor 92 layered on top of the minimum flow mark 90.
- the apparatus can clean an entire circumferential swath in one pass.
- the circumferential swath is approximately the same width 96 as the -diameter between the nozzles 28 which are coupled to the branches 30 of the scarifying head 20.
- use of the false floor 92 is acceptable for restoration applications.
- the rails of the apparatus may be configured to match the shape of the pipe.
- the rail assembly may consist of only one rail with a slot to which the scarifying head 20 may be coupled.
- nozzle assembly in the above description is described as rotating, it may instead oscillate or both rotate and oscillate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/514,650 US20050150531A1 (en) | 2002-05-15 | 2003-05-12 | Interior sewer pipeline scarifying apparatus |
CA2485819A CA2485819C (en) | 2002-05-15 | 2003-05-12 | Interior sewer pipeline scarifying apparatus |
AU2003229447A AU2003229447A1 (en) | 2002-05-15 | 2003-05-12 | Interior sewer pipeline scarifying apparatus |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002386330A CA2386330A1 (en) | 2002-05-14 | 2002-05-14 | Interior sewer pipeline scarifying apparatus |
US10/144,705 US20030213508A1 (en) | 2002-05-14 | 2002-05-15 | Interior sewer pipeline scarifying apparatus |
US10/144,705 | 2002-05-15 | ||
US10/429,790 US7066188B2 (en) | 2002-05-14 | 2003-05-06 | Interior sewer pipeline scarifying apparatus |
US10/429,790 | 2003-05-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003097260A1 true WO2003097260A1 (en) | 2003-11-27 |
Family
ID=31998302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2003/000704 WO2003097260A1 (en) | 2002-05-14 | 2003-05-12 | Interior sewer pipeline scarifying apparatus |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2003097260A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0395628A2 (en) * | 1989-04-27 | 1990-10-31 | Wiener Betriebs- Und Baugesellschaft M.B.H. | Machining device for working the inner wall of an underground channel profile, in particular when non-circular |
FR2720667A1 (en) * | 1994-06-07 | 1995-12-08 | Sra Savac | Flushing and cleaning of drains |
FR2744469A1 (en) * | 1996-02-02 | 1997-08-08 | Rivard Ets | Repair and renovation device for sewers and other tubular constructions |
DE19806350A1 (en) * | 1998-02-11 | 1999-08-12 | Ludwig Dorr Staedtereinigung | Device for cleaning channels |
US6206016B1 (en) * | 1998-07-27 | 2001-03-27 | Mac & Mac Hydrodemolition Inc. | Spray cleaner for interior surface of pipeline |
-
2003
- 2003-05-12 WO PCT/CA2003/000704 patent/WO2003097260A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0395628A2 (en) * | 1989-04-27 | 1990-10-31 | Wiener Betriebs- Und Baugesellschaft M.B.H. | Machining device for working the inner wall of an underground channel profile, in particular when non-circular |
FR2720667A1 (en) * | 1994-06-07 | 1995-12-08 | Sra Savac | Flushing and cleaning of drains |
FR2744469A1 (en) * | 1996-02-02 | 1997-08-08 | Rivard Ets | Repair and renovation device for sewers and other tubular constructions |
DE19806350A1 (en) * | 1998-02-11 | 1999-08-12 | Ludwig Dorr Staedtereinigung | Device for cleaning channels |
US6206016B1 (en) * | 1998-07-27 | 2001-03-27 | Mac & Mac Hydrodemolition Inc. | Spray cleaner for interior surface of pipeline |
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