KR20060033660A - A method for repairing and reinforcing a sewer pipe - Google Patents

Abstract

The present invention is a multi-purpose sewage pipe reinforcement repair method that can be installed at the same time as the sewer pipe repair reinforcement method and also be prepared for the future cable laying. It is about the sewage pipe unexcavated total renovation method that allows two projects to be carried out in a short time at a small cost.

The present invention consists of sewage pipe investigation process, material production suitable for sewage pipe condition, space securing process in sewage pipe, obstacle removal process, maintenance reinforcement process, cable laying and finishing process.

Pipe, sewage, repair, reinforcement, maltar, liner, cable

Description

Multi-purpose sewage pipe repair and reinforcement method {A METHOD FOR REPAIRING AND REINFORCING A SEWER PIPE}

This method can not only construct the index to prevent leakage and inflow of unknown water in the pipe due to partial breakage of sewage pipes buried underground, but also to reinforce the damage and deformation of the pipeline, as well as repair and repair the minute damage of the entire pipeline. It is a multi-purpose non-excavation repair technology for sewage pipes that can be installed at the same time and can be used to bury cables at the same time or to use them in the future. This method improves on the problems described above.

Until now, sewer pipes have been used to excavate the surface of the earth in order to install new pipes. However, due to the rapid development of society, the sewage repair method was socially required to change from excavation to non-excavation method.

In 1996, Korea's first development method, New Technology No. 34 and Patent No. 134987 (Developer Kim Gi-jin), has made rapid progress.

Multi-purpose sewer pipe reinforcement method can be classified into Basic-System and Composite Linging System. Basic and complex systems are classified by repairs based on differences in the degree of failure of sewer pipes.

Sewage pipes in Korea have many problems due to the aging of pipes and problems of construction. As a result, groundwater contamination has become a major social problem.

In response, the government announced the 4 Rivers Water Management Plan and proceeded with a major sewage pipeline maintenance project.

As a result of the sewage pipe maintenance project, the following CCTV observations were made for nationwide pipes.

division Joint Extrude Bad joint Breakage and settlement Sedimentation Pass through another Other ratio(%) 35.4 31.0 14.4 14.7 4.1 0.4

By reading the above CCTV observations, the repair method of the sewer pipe is decided.

Sewage repair can be divided into excavation method and non-excavation method.

Multipurpose sewer pipe repair method of this corporation belongs to the total repair method among non-excavation methods.

The purpose of this method is the problem of strength after repair, which is a disadvantage of reinforcement method of water pipe in Korea Patent Application No. 10-2003-0049867 (2003-07-21) and the disadvantage of Trollining method of Trollining Co. Multipurpose sewage pipe repair and reinforcement

The construction process is as follows.

If intrusion and leakage can be confirmed by CCTV.

Repair pipe cleaning.

Check the location and location of intrusion water, leaks, etc. by the maintenance officer with CCTV that can record 360 degrees.

Move the sealing packer to the maintenance position.

After inflating both ends of the sealing packer first, the center part of the sealing packer is secondly inflated to prevent the inner section of the sealing tube from shrinking.

After injecting the drug, adjust the expansion pressure in the center of the packer to check whether there is a drop in pressure and thereby check for complete repair.

Retract the entire unmanned maintenance machine and recover it

Intrusion and leaks are not visible through CCTV.

Repair pipe cleaning-Dredging so that there are no residues inside the pipe. If there is too much water in the pipe, the operation cannot be performed if the target part cannot be identified by CCTV. .

Move the Sealing Packer to the inspection position (integrated or guided with the camera).

After inflating both ends of the unmanned water condenser firstly, the central part is secondly expanded and water is injected to check for watertightness.

If a defect is found in the watertight test, the mixed medicine is injected through the injection tube.

After injecting the chemical, adjust the inflation pressure at the center of the unmanned water dispenser to check the pressure drop and then check the sealing.

The entire unmanned water condenser is retracted and recovered.

The above method has the following disadvantages.

As it is not a repair method of reinforcement concept, it is not suitable for the construction of repair parts that need reinforcement such as pipe breakage and joint step.

It takes about 40 seconds to cure chemicals, so it can be applied to invasive water but not to effluent. Expensive equipment is required and equipment breaks down frequently. Due to the nature of the drug there is a risk of explosion. Drug recycling is not possible.

 Index ring insertion method

This method was developed in Japan and can be repaired according to various types of damage.

The repair process is as follows.

Use C.C.T.V. to check for damage and obstacles.

If the robot is difficult to enter due to earth and sand, jet cleaning removes various sludge and foreign substances.

Remove obstacles using a cutter robot.

Use a surface polisher to smooth the surface.

A stainless steel plate with water rubber is mounted on a packer.

After pulling the packer to the spot, press the compressed air and compress it.

After tightening, the packer is recovered and moved to the next repair part.

The above method has the following disadvantages.

It is not applicable where there is joint gap.

Increasing construction costs are inevitable due to the introduction of surface polishing machines.

Reinforcement

The above method is a method that is applied to the damaged part that requires partial reinforcement of the pipe as the pipe ages.

Reinforcing material filling method (KATE method)

This method was developed in Switzerland and can be applied mainly to repairing cracks or breakage joints in conduits.

The construction process is as follows.

Block the inflow of rainwater into the maintenance pipeline.

Use C.C.T.V. to check for damage and obstacles.

If the robot's entry is difficult due to earth and sand, jet cleaning will remove various sludge and foreign substances.

Using the cutter robot, remove obstacles and grind the repaired parts.

Jet cleaning removes various sludges and their materials.

Completely dry the pipeline to be repaired using a hot air fan.

Put a repair robot and spray epoxy on the repair part.

Completely dry the repaired parts and drain the rainwater and sewage.

The disadvantages of this method are as follows.

It is a method that repairs only the part of the damaged part, not the shear surface, and there is a high possibility of rework when the above method is not followed.

As the working time takes a long time, the increase of construction cost is inevitable.

Reinforcement Sheet Attachment Method

PL method, reinforcement lining method, reinforces inside sewage pipe by impregnating glass fiber with special adhesive resin (HARZ2000, PUR CPL HARZ) in case of repair part requiring reinforcement such as crack, breakage, water leakage, joint gap, etc. It is a method of pressing on the site.

 It is not necessary to turn water separately due to sufficient passage area of the packer itself. Since the thickness is only 3 ~ 4.5mm after construction, it does not affect the passage area, and the roughness coefficient of the maintenance pipe is almost the same as that of PVC pipe, so the ability to run down the pipe There is no obstacle to

Physical properties of the reinforcement are as follows.

The construction process of the P.L method is as follows.

The P.L method is an economical and efficient method because it can partially reinforce the pipe, but has the following disadvantages.

Since glass fiber is used, there is a high risk of river pollution after a long time.

No exponential capability (no intrusion of intruder into the tube)

If intruded water occurs in the repaired part, it must be removed after it is removed.

The working environment is poor due to the use of glass fiber.

This Composite Point Liner (CPL) method, which is a kind of reinforcement lining method, is expensive because the daily work of the Point-Liner method in Germany is too high. The method of heating shortens the time by more than 50% from 45 minutes to 1 hour, but when cooled after heating (60 ° C), the inner pipe (FRP) is separated from the buried pipe, which does not achieve its intended purpose. . Resin components such as vinyl ether resin (Ass method) and epoxy acritic resin (FRP method), which are used as adhesive resins, differ greatly from each other in thermal expansion coefficients of buried pipes. The degree of contraction differs, so that deformation occurs and a portion of the joint is separated or vulnerable. Even though it is not separated immediately after construction, the adhesive part is fragile and the separation of the inner pipe (FRP) and the buried pipe may proceed gradually due to the infiltration of sewage.

Therefore, this C.P.L (Composite Point Liner) method adopts the natural hardening method and functions as a formwork during the natural hardening time. The function of the packer is a method that shortens the working time and reduces the construction cost by replacing the stainless steel sleeve.

Have no exponential capability

In case of intrusion water in the repaired part, the repair material must be removed and indexed.

The working environment is poor due to the use of glass fiber.

Due to dredging after work, stainless steel is easily separated and clogging occurs frequently.

This method is a method that shortened the curing time by attaching heat supply device to the packer in Japan with the point liner method developed in Germany, and it mainly causes cracks, breakage, step gaps and leakage of conduits. We can apply to reward

The heat of 160 degrees is required, but the heat of resin is only 90 degrees and it is not converted into vulcanized rubber.

Developed exponentially in response. However, the rubber sheet blocks the exponential properties of the medicine.

Rubber may corrode in sulphates with severe sulfuric acid reactions.

The CIPP method currently being used uses a resin of polyester series, which is a thermosetting resin. A serious problem with the CIPP-based process lies in a chemical called styrene, which occurs between the resin and the hot water and steam needed for curing. This styrene substance is an anticancer substance and harmful to the environment, and the above method is problematic in the US and Germany.

The composite watertight method guarantees perfect watertightness, but it is possible to reinforce the partial strength in terms of strength but not the strength of the whole pipe.

The FIPP method is excellent in strength and watertightness, but requires partial repairs in areas with reduced water ingress and intrusion before repair. The construction is suitable where the condition of pipes in Germany and other places is good, but there are difficulties in the application in the current Korean sewer pipes due to the following problems.

The main part of the FIPP process is the welding of pre-liners and in-liners. After welding, reinforcement is filled in the space between them, so this welding is the most important process in the FIPP process. However, the two materials must be free of moisture during welding, but this is not possible due to the current manhole and conduit status in Korea.

The FIPP process requires the production of materials with the smallest diameter of the pipes, thus reducing the diameter of our pipes.

There is a problem in economic efficiency because of the use of free liner and inliner and partial repair.

Unification of the tube is impossible.

Problem of partial repair method

The partial repair method is economical but has problems with the tightness of the whole pipe and the reinforcement of the whole pipe.

An object of the present invention is to provide a repair method of the sewage pipe that can perform the repair of the sewage pipe is very simple and easy to complete and economically more easily than any existing method.

The technical problems such as maintenance of tube diameter reduction, welding of pre-liner and in-liner, and partial repair in case of intrusion water, were solved.

In order to reduce the diameter, the reduction of the diameter is enhanced by the use of steel plates or by special excavation methods.In the case of CCTV observation, non-woven fabric is attached to the in-liner by attaching a non-woven fabric to the pre-liner at a part where damage is large. Weld and carry out partial repair process in FIPP process simultaneously. At this time, when the mortar is injected, the nonwoven fabric is impregnated with special mortar to prevent the invasion water, and also the special mortar is impregnated into the space of the large damaged part to stabilize the repair pipe.

In addition, unlike the occurrence of Stylen, which is an environmentally harmful substance of thermosetting resin in CIPP method, the main component of the repair reinforcement material of the multipurpose sewage contaminant repair method is a special mortar whose mineral is a main component, which is environmentally friendly.

The repair method of the present invention will be described in detail below.

In order to determine the repair method of the pipe, the degree of damage to the pipe must first be determined. The damage of the pipe must be accurately investigated using CCTV.

When investigating the degree of damage to the tube using CCTV, check the damage location of the tube with the camera connection line and record the size and condition of the tube in detail.

Such a record is necessary for the manufacture of repair materials according to the degree of breakage of the pipe.

The repairing material of the pipe is made of high density polyethylene (HDPE) material to produce a pre-liner or an in-liner.

When manufacturing in-liner, reinforcement suitable for the damaged part is reinforced to in-liner according to the range of pipe breakage.

And, when producing a high-density inliner (HDPE In-Liner) to repair the empty round pipe. This is used in the later use of the cable.

On the other hand, after accurately recording the condition of the tube and then to remove the foreign matter in the tube to repair the damaged tube (CUTTER) is performed

After the removal of foreign matters, a cleaning operation is performed to clean the inside of the pipe.

As a preliminary work for the cleaning work inside the pipe, water is turned to the work section inside the pipe.

After checking and recording the condition of the pipe with CCTV, determine the construction method to inject the repair material into the pipe after the cleaning work is done inside the pipe.

The construction method for repairing materials is usually divided into a basic system and a composite system.

In case of basic system, inliner is input. In case of complex system, freeliner, iron plate, and inliner are introduced into the pipe. In complex systems, steel plates and inliners are put in place to prevent the tube from shrinking (reducing the inner diameter of the tube).

On the other hand, when pushing the part recessed into the tube by the iron plate to the outside of the tube, the excavation operation may be made by a special excavator at the position of the recessed portion outside the tube.

When the iron plate is not easily extended from the inside of the tube to the outside by a pneumatically operated packer, the excavation of the earth and sand by vacuum suction input at the same time as excavating only the position from the outside with vibration.

When the addition of the repair material is completed, an inlet for injecting mortar between the inside of the tube and the free liner or between the iron plate and the free liner and the inliner inside the tube is manufactured in the free liner.

In addition, rubber is inserted into both sides between the free liner and the inliner to seal it. Rubber inserted into both sides and sealed is completely fixed by using adhesive on both sides.

Packers of a predetermined length are provided inside the repairing material provided in the pipe, that is, on both sides of the inliner, and air or water is injected into the pipe space between the packers to generate a predetermined pressure inside the pipe.

Water or air pressure is applied to the freeliner space to prevent the preliner from sinking before the maintenance material is added. At least twice the pressure of the injected mortar should be applied to water or air in the space between the packers on the inside of the tube. This is because the mortar has twice the specific gravity of water.

Support installation

Install a support on the packer to prevent accidents.

Mortar injection

Inject maltar into the prepared inlet

Work Complete

After 15 hours of rehabilitation, check the mortar condition of the inlet, remove the equipment and perform the final welding.

Always keep in mind the pressure of air or water during regeneration.

The present invention is an effective, economical and versatile repair method for sewage pipes. Due to the present invention, it is possible to save a lot of foreign currency by localizing the majority of equipment of the FIPP method, and is also an innovative method that improves the problems of the conventional method.

Claims (5)

Identifying and recording the degree of damage inside the tube using CCTV; Manufacturing a liner to fit the tube state; Cleaning the inside of the tube; Subjecting the tube to be repaired; Injecting a repair material consisting of a liner into the tube; Manufacturing a mortar inlet in the liner; Sealing the space between the inliner and the freeliner; Installing packers on both sides of the tube to pressurize the inliner and the freeliner; Applying pressure to the space between the packers; Injecting mortar through a mortar inlet; Naturally curing the injected mortar; Repair and reinforcement method of the sewer pipe, characterized in that consisting of. The method of claim 1, wherein the sealing is made of a rubber material. The reinforcement of the sewer pipe according to claim 1, wherein in the step of inserting the repairing material into the pipe, the iron plate is attached to the free liner at the part protruding into the pipe and then expanded with a packer to push the part protruding into the pipe to the outside. Way. The method of claim 3, wherein the earth and sand are sucked and excavated by vacuum while applying vibration from the outside of the pipe corresponding to the iron plate portion pushed out by the packer to weaken the ground. The method of claim 1, wherein in the liner fabrication step, the inliner is attached with a pipe for installing the cable wire.