JPS58101943A - Repairing and water preventing of underground embedded pipe culvert - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] To stop water leakage or infiltration of underground pipes installed using resin pipes and box carparts when water leaks or intrudes due to defects or cracks in the joints. When carrying out repairs or water-stopping work on large-diameter pipes for which it is not possible to use the one-way packer grouting method, it is more reliable to have workers enter the pipe culvert and perform caulking. This relates to a construction method that can easily and economically perform repairs that have a high level of water-stopping effect and are durable. Also as a caulking agent.

Water is polymerized using water as a crosslinking agent to form a water-insoluble O water-containing rubber-like elastic body, which is impregnated into a fibrous or porous flexible material that exhibits a water-stopping effect. This relates to a method of construction using wood stoppers.

Although the penetration rate of public sewerage systems in Japan is still at a low level, the dimensional accuracy of the main system pipes themselves, which are mainly used, and the construction design and construction accuracy to compensate for this are difficult, so the joints However, even if it is reliable immediately after construction of the circle and L, the joints may be damaged by vibrations caused by heavy objects such as vehicles passing over the installation part after construction, or by various construction works in the adjacent parts. This caused the rubber packing used for the seal to become dislodged and the cool mortar to break, resulting in the wastewater flowing inside the pipe flowing out of the pipe, causing environmental pollution, and causing a large amount of groundwater to infiltrate into the pipe. This puts pressure on the burden of water treatment facility construction, which in turn becomes an economic problem.

The present invention is. In the meantime, from the perspective of saving resources and saving resources, it is important to ensure that sewer pipe repair and water shutoff work is carried out.
The purpose of the present invention is to provide a new construction method using a new material found as a result of studying a construction method that is durable and easy to construct. In the past, various construction methods have been used to repair sewer pipes, but all of them require special mechanical equipment and skilled workers, making it impossible for workers to enter the dock. For small-diameter pipes, the backer method of grouting, which is practiced at various IA sites, is reliable, and there is currently no easy alternative method to it; however, for large-diameter pipes where workers can enter the dock, special equipment is used. From an economical point of view, it is desirable to have a construction method that allows reliable construction using simple tools without having to do anything.

We provide a method of caulking, injecting prepolymer into the cavity on the back side, reacting with water, and forming a water-containing elastic gel tube to create a water-stop seal. Compared to previous construction methods, the IIl&it construction method uses hydrophilic polycrethane resin, which means that the gelled water-containing rubber-like elastic material is soluble in water, so it will not be washed away in groundwater.
It has excellent affinity with water and has excellent adhesion to round surfaces, and because it uses a combination of caulking and grout, it can withstand both water pressure from inside the pipe and water pressure from the outside. It has nine characteristics that make it able to withstand the elements. However, since it requires the operation of a wet pump, and the injection is performed on the back side of the ninety-seven after caulking the surface layer of the imperfectly joined parts and electrical parts, the injection part cannot be visually observed.
Reliable construction requires an appropriate design and experienced workers, regardless of whether it is a construction work or the like. On the other hand, the construction method of the present invention can be applied to defective joints or electrical equipment.
By impregnating and filling a fibrous material such as untied old hemp rope with the prepolymer and filling it with the prepolymer, the prepolymer i-
is cured to create a water-containing elastic gel body, along with a reinforcing material, a waterproof seal and its top, and it is reliable enough that anyone can perform the work while visually checking the joint while it is still wet, without requiring any special skills. By using a large amount of reinforcing agent, it is highly durable and can be easily repaired and watertight. In the current situation where there are few skilled workers, there is a demand for such a simple and highly reliable high performance water stoppage method.

The hydrophilic polyurethane resin prepolymer used in the present invention is Japanese Patent No. 79fi839 "Ground stabilization treatment method" K
A prepolyester having two or more incyanate groups at the end obtained by reacting a highly hydrophilic polyether polyol with an excess of polyisocyanate, which is the same as that described in 69. − is. This prepolymer has the property of easily dissolving or dispersing in water, and the isocyanate groups at the ends bond with each other using water as a crosslinking agent to polymerize and form a rubber-like, highly elastic gel body in a water-containing state. .

Fibrous or porous flexible materials used as reinforcing agents include single-strand cotton, other wood fibers, synthetic fibers, and inorganic fibers bundled into strings or strips, nonwoven fabrics, and porous materials such as flexible polyurethane foam. Nine types of open-cell foam are used, cut into blocks or strips. *It is possible to use materials other than these as long as they are flexible materials that can be easily impregnated with the water-based urethane resin prepolymer and packed at the last minute.

As the caulking material used for finishing, quick setting cement is usually used due to its performance and economical efficiency, but in some cases, synthetic resin caulking materials such as tar epoxy can also be used.

The materials used in the waterproof construction method of the present invention are mainly hydrophilic urethane resin prepolymer, quick setting cement, and synthetic resin caulking materials such as tar epoxy. In order to lower the viscosity of the prepolymer and make it easier to impregnate it into a fibrous or linear porous flexible material, depending on the degree of the prepolymer, or the width of the joint and the gap, 1a7ton, MgK, $Shun ethyl, r-butyrolactone, etc. The use of solvents that do not react with isocyanate groups, such as propylene carbonate or ethylene glycol diacetate; A very small amount of phosphate ester surfactant may be used to slow down the reactivity.

Next, the water stop method of the present invention will be briefly explained.

First, the water in the pipes flowing through the joints of the Hiem pipes that need to be stopped must be cut off in some way. There are two methods of water cutting: one is to use a water control backer to water the entire area, and the other is to attach a quarter-circle stopper frame and water one side while watering the other side. However, either method should be selected depending on the actual situation.

Rinse and remove the water.If there is accumulated dirt or sludge around the joints that require water stoppage, remove any dirt, scrape out any dirt in the joints, and clean and polish. For this pretreatment cleaning work, it is convenient to use an iron scraping rod, a crowbar, or a small electric or air-powered drill with a file or wire brush attached.

After cleaning the water stop area, prepare a disposable bucket, plastic bag, or tin can and pour the prepolymer into it. This container may cause gelation, so it is necessary to make sure that there is no water inside, and if it is wet, it is important to wipe it thoroughly with a dry cloth. Into the container containing the prepolymer, put a strip of hemp rope cut to an appropriate length and loosened from nine-year-old hemp rope, and press it with both hands wearing rubber gloves, twist it, and squeeze it to make the prepolymer. Make sure it is completely immersed in the skin.

Next, remove the excess prepolymer by picking up one end of the strip completely impregnated with the prepolymer and grasping it with the other hand or squeezing it between your fingers from top to bottom. If the joints are dry during filling, spray water to wet the joints before filling to improve adhesion.0 After filling the joints,
Spraying water from above speeds up the curing process, which has the advantage of allowing you to start the next work quickly. To fill the joints with prepolymer-impregnated filler, fill it as tightly as possible and push it in using a spatula or stick with a flat tip and a round end. If the width of the gap between the joints to be filled is narrow or wide, it is necessary to adjust the thickness of the gap accordingly, but if the gap is wide, filling the gap once is not enough, so repeat the above process several times. It is necessary to return.

In this case, it is necessary to spray water each time the filling is done, and while the layers are being stacked, it is necessary to give water for polymerization until the entire joint is finished. Let's leave 9.

After filling all the neem tube joints in this way, the prepolymer is left for about 1 hour until it completely hardens, absorbs water and swells. To confirm the water-stopping effect, we used a quarter-circle water-stopping frame to confirm that no water had entered, and then caulked the remaining gaps around the joints with quick-setting cement to smooth it out and finish. shall be.

In this way, the series of work 1 of the present invention does not require any special equipment and can be carried out while checking its water-stopping effect, and if the effect is not sufficient, that part can be easily carried out. Since it can be repaired by removing it and returning it again, even an inexperienced worker can perform the construction immediately and reliably.

The water stop method of the present invention can be applied not only to sewer pipes, but also to underground pipes for electricity, telephone, gas, etc., joints of subway segments, and repair and water stop of cracks.

A specific construction method will be described in detail below as an example.

Example: In local city sewerage construction, the diameter of 1. GM's BIJ heel pipe joint joint was found to have infiltrated water and was measured at 13L/9 locations.
The infiltration part is 3 minutes from the center of the clear surface to the top surface.
Between 0011 and 9, it was recognized that the entire joint needed to be repaired and watertight, and the sand and sludge that had become clogged within the joint were scraped out and cleaned using a crowbar and an electric drill with a wire brush attached. Polished and cleaned the inside and surrounding area of the joint. The middle part of the joint is 30m at the widest point and 22m at the narrowest point, and is round.

After thoroughly cleaning the inside of the joint, I loosened the old hemp rope used to seal the joint on the ship's deck, cut it into 1 meter lengths, and put the pieces into a 201 plastic bucket. Commercially available Brepolymer Hicel 0H-IA
(manufactured by Toho Chemical Industries) and soaked it in the bare skin.To ensure sufficient impregnation, I put on rubber gloves and pressed it with both hands and squeezed it to air the bare skin. After making sure that there is no residue left, pick up the l end with your hand.
Grab it with your other hand and squeeze it from top to bottom to get the extra 0H-
A friend who got rid of one person. Next, I pushed it into the joint using my fingers and pushed it in firmly with a wooden round bar 20 meters in diameter.

I sprayed water on top of it with a pistol-grip plastic sprayer, wetted it, and filled it with 0H-IA-impregnated skin again, and layered it up to the 40th point from the joint. To fill the entire part of the joint with maihada, proceed from the bottom to the top and collect the infiltrated water on the top surface, and when filling this part, hold it down for about 20 minutes until it has fully hardened. Did. To fill the bottom part where sewage flows, we used quarter-circle water stop frames to stop the water on one side at a time. After completing the entire filling work, leave it as it is for half a day to ensure that the water has stopped, and then add 6 parts of Ceromax for water mixing (manufactured by Showa Denko) and 4 seconds of tap water to the gap between the joints.
Knead together with both hands, fill with Kyukyu cement mortar, smooth it with a trowel, and finish it with 6 parts of Cerecit (Showa Denko A), 1 part of vinyl acetate emelgin, and 2 parts of water (by weight). Mix it in the proportion of 100% and apply it with a trowel to complete the process.

Six months later, the ship entered the dock again for the ninth time and inspected the filling area. Before construction, there was 13 tons/min of infiltrating water, but no infiltrating water was observed and the water was completely stopped.

Patent applicant: Toho Chemical Industry Co., Ltd. Same as Toho Special Construction Co., Ltd.

Claims (1)

[Claims] Repair and water-stopping of defective joints and cracks in underground pipes - Hydrophilic polyurethane resin that polymerizes fibrous or porous flexible materials using water as a crosslinking agent to form a water-containing elastic gel body. Prepolymer is impregnated and filled into defective joints and cracks, and reacted and cured by existing moisture or infiltrating water to create a water-insoluble water-containing rubber-like elastic material as a water stopband. A repair and water stoppage construction method that will become an image.