KR20090099441A - A spray-lining spray system for the rehabilitation of deteriorated pipes - Google Patents

Abstract

A lining spray apparatus connecting cable of an old piping is provided to minimize the repair time and cost of the old piping by preventing the excavation of the road for the old piping replacement. A lining spray apparatus connecting cable of an old piping comprises a resin pipe(110), a hardener pipe(120), a hot water supply pipe(130), hot water collecting pipes, an air pipe(150), a glass-fiber rod(160) and a CCTV cable. The resin pipe supplies the resin. The hardener pipe supplies the hardener to be mixed with the resin. The hot water supply pipe supplies the hot water in order to make the hardener keep the apt temperature for spraying. The hot water collecting pipe collects the hot water. The air pipe sprays the polyureaurethane mixed with the resin and the hardener. The air of the optimal pressure is supplied to a head unit of a spray apparatus(70). The glass-fiber rod controls the elasticity of the connecting cable. The CCTV cable is connected to a CCTV camera device(71) in order to observe the piping state and lining state.

Description

A spray-lining spray system for the rehabilitation of deteriorated pipes}

The present invention relates to a non-excavated lining method and spraying apparatus of an aging pipe, in particular to prevent the rust of the existing pipe by coating the liner in the spray method inside without digging the old water pipe and to prevent the lining layer between the water and the existing pipe Non-excavation spray lining rehabilitation of old pipes to prevent rust generation and leakage, and to minimize road repair costs and time of old water pipes by preventing road excavation caused by traffic congestion caused by replacement of water pipes. The present invention relates to a spray device equipped with a CCTV camera to control the construction and construction in real time.

In general, water pipes mainly use cast iron pipes or steel pipes. When the water pipe is used for a certain period of time, corrosion occurs and rust is generated, and the pipe diameter is narrowed due to rust nodules, so that the flow rate is reduced, and leakage occurs due to loosening of the joint and tube breakage due to corrosion. Therefore, after a certain period of time, it must be replaced with a new conduit. (Dongdo Engineering, 1998)

The replacement of old water pipes is to excavate the road, remove the existing water pipes, and bury new water pipes. However, most of the areas where the water pipes are buried are roads, and the excavation work to replace them causes traffic congestion, requires a lot of time and money to replace them, and leaks in the joints of the replaced water pipes can occur again, resulting in economic loss and There was also a problem that the life is shortened.

On the other hand, the epoxy resin lining rehabilitation method (Dongdo Engineering Co., Ltd., 1998) is a method of forming a coating film with the required thickness (1.0mm) in one time to spray the tar epoxy resin (KWWA M 121) for water supply into the old water pipe. Although it is an advantageous method in terms of technology and construction, the following technical drawbacks, that is, when the size of the leaking hole in the old pipe is large, the complete coating is uncertain, and the formation of pinholes in the spraying process cannot be avoided. Corrosion can not be excluded, and when it is not completely dried, amines contained in the hardener may be eluted from the tap water, which may harm the human body. .

Another method is the non-excavation PE lining rehabilitation method of the old water pipe (Korea Patent No. 10-0606188), which is used to insert a flexible plastic pipe into the old pipe inside the pipeline to be installed on the inner wall of the pipeline by heat pressurization, The PE lining rehabilitation method is to put a polyethylene liner made of tubular body in the pipe of the old pipe, expand with high pressure steam to install the liner on the inner wall of the old pipe, the installation process of the liner is complicated, the branch pipe connection is complicated The disadvantage is that the process time is long and expensive.

In general, the polymer has polyurea properties as a result of the reaction of polyisocyanates with polyamines (The Wesley Repot, 2005). However, the spray material used in the present invention relates to polyether-containing polyureaurethanes (PUUs). Polyisocyanates useful for the preparation of the polyureaurethanes of this material are diverse and extensive (The Wesley Repot, 2005). Aliphatic polyisocyanates, alicyclic polyisocyanates in which at least one of the isocyanate groups are attached directly to the alicyclic ring, aromatic polyisocyanates in which at least one of the isocyanate groups is attached directly to the aromatic ring, and mixtures thereof, including but not limited to (Korean Patent No. 10-0638194). In a non-limiting embodiment, when aromatic polyisocyanate is used, care must be taken to select materials that do not discolor (yellow) the polyureaurethane (Korean Patent No. 10-0638194).

In other non-limiting embodiments, the polyisocyanate groups can include, but are not limited to, aliphatic or cycloaliphatic diisocyanates, aromatic diisocyanates, cyclic dimers and cyclic trimers thereof, and mixtures thereof. (Korean Patent No. 10-0638194).

Polyether containing polyols and methods for their preparation are known to those skilled in the art. Polyether / containing polyols of various types and molecular weights are commercially available from various manufacturers (Korean Patent No. 10-0638194).

In a non-limiting embodiment, the polyether / containing polyols can include polyester polyols, polycaprolactone polyol polycarbonate polyols, and mixtures thereof (Korean Patent No. 10-0638194). Non-limiting examples of these polyols may include, but are not limited to, low molecular weight diols and triols (Korean Patent No. 10-0638194). The amount of triol selected is such that crosslinking does not occur highly in the polyurethane (Korean Patent No. 10-0638194).

A plurality of hardening agents of the amine bond structure suitable for use in the material used in the present invention are numerous and extensive (Korean Patent No. 10-0638194). Non-limiting examples include polyamines with more than one amino group per molecule, each amino group being independently selected from primary amino (-NH2) and secondary amines (-NH-), tertiary amines (dimethylbenzylamine) It includes but is not limited to this (Korean Patent No. 10-0638194). In another non-limiting embodiment, the amine-containing curing agent can be selected from aliphatic polyamines, cycloaliphatic polyamines, aromatic polyamines and mixtures thereof (Korean Patent No. 10-0638194).

In other non-limiting embodiments, the amino groups are all primary groups. In embodiments where a less colored polyureaurethane is to be prepared, the amine-curing agent may be prepared and / or stored in such a way that the amine-curing agent is relatively low in color and / or that the amine does not exhibit color (eg yellow). Can be selected. (Korean Patent No. 10-0638194)

The material used in the present invention is composed of a polyurethane bond (polymer of polyether containing polyol and polyisocyanate) and a polyurea urethane (PUU) structure of polyurea bond (polymer of polyisocyanate and polyamine) and is widely used for the following applications. Can be used (The Wesley Repot, 2005). Examples include the coating of impact resistant pipelines, automotive paints, the railway and aviation industry and general corrosion resistant coatings. (The Wesley Repot, 2005).

[references]

1. Dongdo Engineering Co., Ltd., PE pipe lining rehabilitation method for aged water pipes (New Technology No. 88), 1998.

2. Lee Sugong Co., Ltd., unexcavated PE lining rehabilitation method of old water pipes (Korea Patent 10-0606188), 2006.

3.The Wesley Repot: The Wesley Corporation / Corrosion Control Consultants and Labs, Inc., 2005.

4. Fiji Industry Ohio Inc., impact resistant polyureaurethane and manufacturing method (Korean Patent No. 10-0638194), 2006.

An object of the present invention is to provide a spray lining method that allows rehabilitation of an aged pipeline without digging the entire ground.

Another object of the present invention, by spraying the polyureaurethane mixed with the main agent and the curing agent by introducing a spray device into the old pipe, it can be cured in one minute, allowing water to pass within one hour to complete the work in a short time The purpose is to provide a lining technique.

In addition, another object of the present invention is to mount a CCTV camera on the spray device to check the state of the inner wall of the pipe in real time to adjust the spray time.

In addition, the present invention is configured to integrally connect the connection hose between the spray device and the spray control device, the main body of the polyurea urethane and the curing agent hose and the hot water hose for the viscosity control and CCTV cable and the hose to prevent the shape of stretching or shrinking stable It includes a glass fiber rod to control the elasticity to form a lining film of a thickness.

An object of the present invention as described above is to lining by applying a fast curing polyureaurethane to the inner wall of the pipe by a spray method. It consists of a polyisocyanate containing a polyurethane bond, which is a polymer of a polyether-containing polyol and a polyisocyanate, and a polyurea urethane (PUU) structure composed of a polyurea bond, a polymer of a polyamine, and has a polyurethane bond structure. Amine-bonded hardener is mixed and sprayed on the inner wall of the pipe.

The present invention provides a lining method for rehabilitation of old pipes, comprising: a work tool forming process for cutting pipes and forming a work tool by excavating both ends of a work zone for rehabilitation work of an old pipe; A cleaning process of removing rust, removing foreign matters, and cleaning the inner wall of the pipe while inserting the scraper into the pipe at one side of the work tool and withdrawing it to the other side; A drying step of removing water from the inner wall of the pipe after the cleaning step; An inner wall photographing step of photographing and inspecting an inner wall state of a pipe after the drying step; Spraying polyurea urethane while lining the spray device equipped with a CCTV camera into the pipe and checking the tube state in real time while drawing the spray device to the other side; Inspecting the lining state of the inner wall by passing CCTV into the pipe after the lining process; After the inspection process is made to join the flange to the end of the cut pipe is connected to the pipeline and to install the manhole in the working tool and then to finish the process.

The cleaning process may be performed by removing the rust and debris from the inner wall of the pipe while removing the scraper into the conduit and drawing out the other side. Also, the debris may be removed by connecting the pipe plunger with the scraper. The pipe plunger may be connected to two or more of the pipe plunger and withdrawn at a time by the winch.

In addition, the cleaning process, in the case of small diameter pipe spraying the washing water may be performed to remove the rust and foreign matter on the inner wall of the pipe using a rack feed borer (Rackfeed Borer).

In the drying step, the pipe plunger matching the inner diameter of the pipe is inserted into the pipe, and then pulled out by the winch on the other side to draw out the pipe plunger to remove water with foreign matter removal, and the pipe plunger is provided with two or more pieces. It can also be connected and pulled out at the same time by winch. In addition, a process of removing water by connecting a sponge to the rear end of the pipe plunger may be performed at the same time.

In addition, in the drying step, after inserting a sponge suitable for the inner diameter of the pipe, the shoe is coupled to the pipe to block one side, and high pressure air is injected to remove the water in the pipe by discharging the sponge by air.

The present invention, while supplying the main body and the curing agent in the spray control device, and withdraw the spray device to apply a polyureaurethane to the inner wall of the pipe by the spray method to form a lining.

The connecting cable between the spray control device and the spray device introduced into the pipe includes a main pipe for supplying the main body of the polyurethane bonding structure at a predetermined pressure, a hardener tube for supplying the curing agent of the amine-bonding structure, and a main and hardening agent. The hot water supply pipe for supplying hot water so that the final temperature before spraying is maintained at 25 ° C to 35 ° C, the hot water supply pipe is branched in two at the cable end, and the two hot water recovery pipes for recovering hot water are mixed with the static mixer. Polyurea urethane is a hose integrated with a Teflon tube wrapped with a Teflon tube, including a glass fiber rod for controlling the elasticity of the hose and the air tube for supplying air for spraying the spray head by pneumatic pressure.

In addition, a CCTV camera is installed in the spray device, the power supply and communication cable of the CCTV camera is inserted into the hose and when the lining construction is configured to adjust the lining thickness by observing the shape of the inner wall of the pipe in real time.

The present invention forms a lining with polyureaurethane, but mixed with the main body and the curing agent by curing the spray on the inner wall of the old pipe by the spray method cured in 60 seconds gel time (25 ℃) and after 10 minutes CCTV shooting is possible 60 After hardening, it can be completely cured and water can be shortened. In addition, the thickness of the lining using polyurea urethane can be within the range of 1 ~ 5mm, and cracks or holes of less than 5mm are automatically blocked by lining due to the viscosity of polyureaurethane to make safe construction. Even if the finish is not formed lining is very easy to construct, and can finish the work in a short time, there is an effect that can reduce the traffic obstacle time and the short time due to the road excavation.

Polyisocyanate based on polyureaurethane (PUU) applied to this process adopts aliphatic polyisocyanate and has moisture resistance compared to aromatic polyisocyanate, and also conventional polyurea coating (gel time 2-3 seconds). Compared with the extended gel time (60 seconds), the adhesion and adhesion to the adherends in the spray regeneration method are increased, the content of residual isocyanate monomer (less than 0.1%) is very low, and there is no solvent. It is harmless in terms of hygiene and safety in terms of hygiene and safety, and it is environmentally friendly because it has no long-term safety and durability in spraying and curing (The Wesley Repot 2005: The Wesley Corporation / Corrosion Control Consultants and Labs, Inc.) .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a basic process diagram for explaining the lining method according to the present invention.

A work tool forming process (S10) of excavating both ends of a work section for rehabilitation work of an old pipe to form a work tool for cutting and lining work of the pipe 10; A cleaning step (S20) of inserting the scraper 30 into the conduit at one side of the work tool S10 and withdrawing the scraper to the other side to remove rust and remove foreign substances from the inner wall of the pipe 10; A drying step (S30) of removing water from the inner wall of the pipe 10 after the cleaning step (S20); An inner wall photographing step (S40) of photographing and inspecting an inner wall state of the pipe 10 after the drying step (S30); When the rust and debris removal of the inner wall of the pipe 10 is completed by the inner wall photographing process (S40), a spray device 70 equipped with a CCTV camera is introduced into the pipe 10 so that the shape of the pipe and the spraying process are performed in real time. Spraying and lining the polyurea urethane while observing (S50); Checking the lining state of the inner wall by passing the CCTV camera into the pipe after the lining process (S60); After the inspection process is made to join the flange to the end of the cut pipe (10) to connect the pipeline and fill the work tool and then finish (S70).

2 is an explanatory view of a cleaning process of an inner wall of a pipe during a lining method of the present invention.

As shown in the figure, the both ends of the working section to perform the rehabilitation work of the old pipe is excavated to cut the pipe 10 to form a work tool. After the work tool forming process (S10) as described above to perform a cleaning step (S20) for cleaning the inner wall of the pipe (10).

In the cleaning step (S20), the scraper 30 is inserted into one side of the pipe 10, and the other side pulls the scraper 30 through the winch 31, and connects a rope to be introduced to the scraper process several times. Repeat this to remove rust or foreign matter on the inner wall of the pipe. In addition, the pipe plunger 40 together with the scraper 30 is removed to carry out the removal of foreign substances, the pipe plunger 40 may be connected to the plurality of two or more by a winch at once. In addition, the high pressure washing water may be sprayed to remove rust and foreign matter from the inner wall of the pipe. The edge of the pipe plunger 40 is made of a rubber material to be in close contact with the inner wall of the pipe to remove foreign substances and to remove moisture.

After cleaning by scraping and washing the inner wall of the pipe 10 in the same manner as described above, a drying step (S30) of removing the water of the inner wall of the pipe is performed. At this time, the drying process is not to completely dry the inner wall of the pipe, but to the extent that the water is removed without collecting any parts.

After cleaning the pipe 10, the drying method is to insert a pipe plunger that matches the inner diameter of the pipe, remove the remaining foreign matter and water by drawing it from the other side, and by connecting the sponge to the pipe plunger to remove the foreign matter by the pipe plunger. And dried by pushing the water and the like to remove the water with a sponge.

In addition, after the pipe plunger and the sponge are inserted, one side of the pipe 10 is blocked, and high pressure air is injected using an external high pressure compressor. Accordingly, the pipe plunger and the sponge may be pushed to the other side of the pipe 10 while drying the inner wall of the pipe.

Then, as shown in Figure 3, in order to inspect the state of the inner wall of the pipe using the monitoring device or the imaging vehicle 61, the imaging device 60 is put into the interior of the pipe 10 to photograph the pipe inner wall Perform the photographing process (S40) to monitor and inspect the image.

If rust or foreign material remains, the cleaning process (S20) and the drying process (S30) can be repeated again depending on the condition, and may be supplied again and treated by supplying only the high pressure washing water. Optional processing. In addition, when there is a hole or a crack is a predetermined size or more can be filled in the corresponding site, the lining operation can be performed.

If it is determined that the cleaning state is good in the imaging process (S40), as shown in Figure 4, the lining process (S50) is performed.

In the lining step S50, the spray device 70 equipped with the CCTV camera 71 is introduced into the pipe 10, and the spray device 70 is drawn out in real time through the CCTV camera while taking out the spray device 70. By monitoring the state and adjusting the injection amount of the polyureaurethane to form a lining made of polyureaurethane in the inner wall pipeline.

5 is a cross-sectional view of the spray device connecting cable of the lining method used in the present invention.

Polyurea urethane is sprayed on the inner wall of the pipe 10 to form a polyureaurethane inner wall pipe, wherein a polyisocyanate containing a polyurethane bond structure is used, and a polyamine having an amine bond structure is used as a curing agent. Mix and spray the subject and hardener.

The connecting cable between the spray control device and the spray device introduced into the pipe may include a main pipe 110 for supplying polyisocyanate containing a polyurethane bonding structure by heating (eg, 30 ° C. to 40 ° C.) as a main body, A curing agent tube 120 for heating and supplying polyamine as a curing agent, a hot water supply tube 130 for supplying hot water such that the final temperature before spraying the main body and the curing agent is maintained at 25 ° C to 35 ° C, and the hot water supply pipe 130 Two hot water recovery pipes 140 for separating hot water from the cable end and recovering hot water, and a main mixer and a hardener supplied through the main pipe 110 and the hardener pipe 120 are static mixers of the spray device 70. Air pipe 150 for supplying air of a suitable pressure for spraying the mixed polyureaurethane through the head portion of the spray device 70 and the glass fiber for controlling the elasticity of the connecting cable Including the rod 160 and the CCTV camera cable 170 connected to the CCTV camera device 71 mounted on the spray device 70 in order to fill the resin 102 and reduce the friction force on the outside The Teflon tube 101 is a connecting cable integrated with an outer coating.

The spray hose 100 of the present invention thus formed is connected between the spray device 70 and the spray control device 80, and the mixing ratio of the main material and the hardener in the spray control device 80 is about 38 to about 100. Feed to 42 volume ratio. Preferably the subject: curing agent is controlled to be supplied at a volume ratio of 2.5: 1.

Therefore, when the main body and the curing agent are mixed and sprayed, the curing agent is cured within 1 minute due to the mixed physical properties of the main body, and thus there is an advantage that water can be passed within 1 hour after the completion of the entire process.

At this time, the hot water supply pipe supplying hot water for maintaining the proper temperature (25 ℃ 35 ℃) required for spraying the main body and the hardener heated to the proper temperature (40 ℃ or lower) through the hose to maintain the proper viscosity of the main body and the curing agent. 130, the hot water supply pipe 130 is connected to two hot water recovery pipes 140 to recover hot water. One hot water supply pipe 130 and two hot water recovery tubes 140 are arranged around the main pipe 110 and the hardener pipe 120 to maintain an appropriate temperature (25 ° C. to 35 ° C.) of the main water and the hardener. Try to lower the viscosity. The main body and the hardener are mixed while being mixed in the static mixer of the sprayer 70 and pressurized to a predetermined pressure and sprayed by the nozzle of the sprayer 70 by the air supplied through the air pipe 150. Thus, it can supply and spray in the state which kept ductility of polyureaurethane.

As such, the connection cable of the spray device for spraying the polyureaurethane to the inner wall of the pipe to form the polyureaurethane lining, the glass fiber rod 160, the main pipe 110, the hardener pipe 120, the hot water supply pipe 130 After forming the hot water recovery tube 140, air tube 150, CCTV cable 170 by integrating and molding into a single hose inside the Teflon tube 101 to fill the resin 102 and reduce the friction force on the outside It consists of a cable which is integrated by coating an outer jacket. Using the connection cable, the spray lining process is manipulated according to the pipe condition while checking the spray lining process in real time, and when the connecting hose is towed to the other side by embedding the glass fiber rod in the connecting hose, By preventing the formation of a non-uniform coating layer due to the repetition to control the working surface, by using a Teflon tube outside the connecting hose to reduce the surface friction with the inside of the tube to ensure the homogeneity of the lining surface.

Lining process by lining by adjusting the construction speed in accordance with the shape of the tube in real time through the spray device 70 attached to the CCTV camera 71. That is, as shown in Figure 5, such as the connecting portion of the pipe in the same place to check the piping connection by the CCTV camera 71, at the corresponding position to slow down or pause the moving speed of the connection hose to connect more spray The polyurea urethane lining is appropriately formed at the site. 10a of the figure shows a lining film.

The lining thickness is constructed with a thickness of about 1 ~ 5mm, if the crack of the pipe 10 is less than 5mm is lined by polyureaurethane.

After forming the lining wall by spraying the polyurea urethane to the inner wall of the pipe 10 by spraying method as described above, inspect the lining state by inserting a CCTV camera and connect the pipe by coupling the flange to the cutout of the pipe 10 , Install the manhole and perform the finishing process (S80).

On the other hand, after the lining inspection process (S60), it may further include a secondary cleaning process for washing the water and chlorine disinfection.

Therefore, by using the present invention, it is possible to perform the rehabilitation of the pipe by forming a lining film on the inner wall of the old pipe, and by applying a spray method to be cured within 1 minute, the water can be passed within 1 hour, traffic due to road excavation, etc. It is possible to reduce the down time, and to reduce the inconvenience of water supply blocking due to the pipeline blockage.

1 is a process diagram of the aging piping lining method according to the present invention.

2 is an explanatory view of a cleaning process of a lining method according to the present invention.

3 is an explanatory view of a photographing process of a lining method according to the present invention.

Figure 4 is an illustration of the lining process of the lining method according to the present invention.

Figure 5 is an explanatory diagram of a spray device connection cable configuration according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: piping 10a: lining

30: scraper 31: winch vehicle

40: pipe plunger

60: recording device 61: recording vehicle

70: spray device 71: CCTV camera

80: spray control device 100: spray device connection cable

101: teflon tube 102: resin

110: main pipe 120: curing agent pipe

130: hot water supply pipe 141, 142: hot water recovery pipe

150: air pipe 160: glass fiber rod

170: CCTV cable

Claims (1)

The spray control device supplies the main body and the curing agent, the hot water supply and recovery, the air for spraying to the spray device, and the lining spray device which draws the spray device and applies polyurea urethane to the inner wall of the pipe by spraying. In The spray device is equipped with a CCTV camera, The spray device and the spray control device connecting cable, A main pipe (110) for supplying a polyisocyanate containing a polyurethane bond as the main material; A curing agent tube (120) for supplying a polyamine for mixing with the subject as a curing agent; A hot water supply pipe 130 for supplying hot water to maintain a proper temperature (25 ° C. to 35 ° C.) required for spraying the heated main material and the curing agent to maintain an appropriate viscosity of the main material and the curing agent; Two hot water collecting pipes 141 and 142 for recovering hot water by separating the hot water supply pipe 130 into two at a cable end; An air pipe 150 for supplying air of an appropriate pressure for injecting the polyurea urethane formed by mixing the main material and the curing agent; Glass fiber rods 160 for controlling the elasticity; Signal connection cable 170 of the CCTV camera for observing the pipe state and lining state in real time; wrapped with a Teflon tube 101, and filled with a resin 102 inside the Teflon tube 101, characterized in that configured Lining spray device.

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