KR102595064B1 - Eco-friendly two component type ground urethane reinforcement and reparing agent for urethane power consolidation method and UPC construction method of ground using the same - Google Patents

Abstract

The present invention relates to a ground reinforcement and repair material used in UPC construction of the ground. More specifically, a ground reinforcement and repair material with a high expansion ratio (expansion force) and excellent curing speed and compressive strength, and a UPC construction method using the same. It's about.

Description

Eco-friendly two component type ground urethane reinforcement and reparing agent for urethane power consolidation method and UPC construction method of ground using the same}

The present invention relates to an eco-friendly two-component urethane-based ground reinforcement repair agent for the UPC method for repairing and/or reinforcing soft ground with insufficient bearing capacity such as roads, railways, runways, sidewalks, factories, and building foundations, and to a UPC construction method for the ground using the same. It's about.

Civil engineering structures such as general roads, highways, railways, factories, buildings, houses, etc. are generally formed on the ground, and when the foundation ground subsides, a level difference occurs in the foundation ground due to the influence of adjacent structures, poor construction, etc. Civil engineering buildings, etc., become tilted or damaged, shortening their lifespan.

In general, construction work to reinforce the foundation ground or repair the subsiding ground is continuously performed. Among these, the purpose of consolidating the ground, increasing the bearing capacity of the ground, reducing permeability, and integrating the ground and the structure is carried out. Grouting construction, which involves injecting grout containing cement as the main ingredient such as various cements, mortars, and chemicals, into the ground, around structures, and into the structures themselves, is being carried out frequently.

The cement grouting method is a method of injecting cement grout into the cracks of soil or rock using an injection pump, etc., by installing an injection pipe in the ground and dispersing the cement grout through the injection pipe into the grout material. This is a method that increases the bearing capacity of the target ground by solidifying the ground and improves water resistance by reducing the permeability coefficient.

However, this cement grouting construction is complex and multi-step. For example, if the asphalt road surface is curved or damaged due to a step, the asphalt road in the area to be grouted is removed. At this time, since the asphalt road must be removed from a very large area, grouted, and then the asphalt road must be rebuilt, the construction method is very complicated and takes a long time, causing traffic congestion for a long time.

In addition, the cement grout material used in cement grouting construction is low in cost and guarantees constant strength, but has a long curing period and a large load, so it is less effective in soft ground.

In particular, under soft ground, the steel pipe multi-stage injection method or the urethane-based chemical injection method is applied. The steel pipe multi-stage injection method has a good effect of increasing strength and reducing load, but has poor water blocking effect and the process required for reinforcement work is very important in the excavation process. It is very disadvantageous in adjusting the air quality, and if there is a lot of groundwater outflow, the water blocking effect can hardly be expected, so the scope of application is very limited. In addition, the LW (Lables Wasser Glass)-based chemical injection method and the SGR (Space Grouting Rocket System)-based chemical injection method are methods developed based on the phenomenon that water glass chemicals and cement suspensions turn into gels when mixed. It has the advantage of low material and construction costs as no waste is generated, but large-scale equipment is required and other complex mechanical equipment such as boring machines must be installed for drilling, and groundwater has a negative effect on the consolidation characteristics of fluctuating ground such as fine sand or clay layers. The disadvantage is that planned construction is difficult because the impact is significant.

In addition, the polyurethane injection method began to be used in construction in the 1990s as a rock solidification method (PUIF). The polyurethane injection method involves drilling holes at regular intervals in soft strata, fracture zones, and fault zones, then inserting injection bolts, and then inserting the inserted injection bolts. A two-component foaming urethane chemical solution is mixed in the bolt and a pressure of about 20 kg/cm ² is applied to completely fill the space between the arm pins of the rock where the joints are developed. One rock body forms an arch shape and deforms by supporting the load on the rock at the top of the tunnel. It is a method to prevent.

The urethane-based chemical injection agent used in the conventional polyurethane injection method uses a two-component urethane chemical solution consisting of liquid A, which is the main agent, and liquid B, which is the hardener. The compressive strength and bending strength are low, and the foaming and curing time are slow, so this is used. There is a problem of limited ground available for reinforcement and/or repair.

Republic of Korea Patent Publication No. 10-1078044 (2011.10.24) US Patent No. 4567708 (1986.02.04)

Existing urethane-based repair agents applied to the polyurethane injection method had a problem of low foaming power or failing to secure sufficient mechanical strength when the foaming power was high. However, the present invention is a urethane-based repair agent that can secure not only excellent foaming power but also excellent mechanical strength. The present invention was completed by learning the optimal composition and composition ratio of the water retention agent. That is, the present invention seeks to provide a two-component urethane-based ground reinforcement and repair agent for UPC (Urethane power consolidation) construction and a UPC construction method for ground using the same.

The eco-friendly two-component urethane-based ground reinforcement repair agent (hereinafter referred to as “ground reinforcement repair agent”) for UPC (Urethane power consolidation) method of the present invention to solve the above-mentioned problems includes high molecular weight polyether polyol and low molecular weight polyether polyol. A first liquid containing a polyether polyol mixture; and a second liquid containing diisocyanate.

As a preferred embodiment of the present invention, the polyether polyol mixture may include high molecular weight polyether polyol and low molecular weight polyether polyol in a weight ratio of 1:3 to 6.

As a preferred embodiment of the present invention, the high molecular weight polyether polyol and low molecular weight polyether polyol among the components of the ground reinforcement and repair agent of the present invention may satisfy Equation 1 below.

[Equation 1]

0.130 < A/B < 0.400

In Equation 1, A is the weight average molecular weight of the low molecular weight polyether polyol, and B is the weight average molecular weight of the high molecular weight polyether polyol.

As a preferred embodiment of the present invention, the first liquid may include the low molecular weight polyether polyol, high molecular weight polyether polyol, polyester polyol, moisture reaction inhibitor, crosslinking agent, foam stabilizer, catalyst, and foaming agent.

In a preferred embodiment of the present invention, the first liquid contains 4 to 10% by weight of polyester polyol, 8 to 10% by weight of moisture reaction inhibitor, 5 to 8% by weight of crosslinking agent, 2 to 5% by weight of foam stabilizer, and 1.5 to 1.5% by weight of catalyst. It may include 3.0% by weight, 2 to 10% by weight of foaming agent, 10 to 17% by weight of flame retardant, and the balance of a polyether polyol mixture.

As a preferred embodiment of the present invention, the high molecular weight polyether polyol may include a polyoxyalkylene triol with a hydroxyl value of 50 to 150 mg KOH/g and a functional group of 2 to 3.

As a preferred embodiment of the present invention, the polyester polyol may include a polyester polyol with a functional group of 1.5 to 2.5 and a hydroxyl group of 300 to 400 mg KOH/g.

In a preferred embodiment of the present invention, the moisture reaction inhibitor may include one or more vegetable oils selected from castor oil, soybean oil, and corn oil.

In a preferred embodiment of the present invention, the crosslinking agent is ethylene glycol, triethanolamine, 1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 2-ethyl-1,3-hexanediol, and 2- It may include one or more types selected from methyl-1,3-propanediol and 1,6-cyclohexanediol.

In a preferred embodiment of the present invention, the foam stabilizer may include a silicone foam stabilizer.

As a preferred embodiment of the present invention, the catalyst may include one or more types selected from tertiary amine-based catalysts and organometallic-based catalysts.

In a preferred embodiment of the present invention, the foaming agent may include water.

As a preferred embodiment of the present invention, the second liquid may include a fluidizing agent and diisocyanate.

As a preferred embodiment of the present invention, the second liquid may include 3 to 5% by weight of a fluidizing agent and the remaining amount of diisocyanate.

In a preferred embodiment of the present invention, the fluidizing agent is selected from among epoxidized soybean oil (ESO), polycarboxylic acid (PC) surfactant, and polymelamine sulfonate sodium condensate (PMS) surfactant. It may include one or more selected types.

As a preferred embodiment of the present invention, the diisocyanate may include one or more selected from diphenylmethane diisocyanate (MDI), modified MDI, polymeric MDI, and toluene diisocyanate (TDI).

Another object of the present invention is to provide a ground reinforcement repair construction method through the UPC method using the ground reinforcement repair system described above.

As a preferred embodiment of the present invention, the ground reinforcement repair construction method of the present invention includes the first step of confirming the ground to be reinforced; Step 2: drilling the confirmed reinforcement target ground and then inserting the injection pipe into the hole; First liquid storage tank. 3 steps of connecting the injection pipe with the injection hose of the injection device connected to the second liquid storage tank and the hydraulic compressor, then mixing and injecting the first and second liquids of the two-component urethane-based ground reinforcement repair agent through the injection device. ; And after confirming the level of the ground due to the expansion of the ground reinforcing agent, removing the injection hose from the injection pipe and sealing the perforation to finish the 4th step; performing a process including reinforcing and/or repairing the ground. You can.

Steps 2 to 4 may be performed while observing the displacement of the surface layer and/or deep ground using a laser level.

The ground reinforcement and repair material for the UPC method of the present invention has a high expansion force of about 5 to 25 times, high compressive strength and flexural strength, and a fast curing speed, enabling ground reinforcement and repair in a short time. In addition, since the injection amount and injection time can be easily fine-tuned during ground reinforcement and/or repair construction using the above-mentioned ground reinforcement and repair materials, constructability is good, there is no uplift phenomenon around the ground during ground reinforcement and water blocking, and the outside of the ground reinforcement and repair materials is Leakage and loss can be prevented. In addition, the ground reinforcement repair construction method using the UPC method can be constructed even on soft ground where the overburden load of the ground itself should not be increased, and construction is also possible in narrow spaces (offices, workrooms, etc. in buildings). In addition, the expanded foam of the constructed and foamed ground reinforcement and repair material is not affected by the surrounding temperature, so there is no semi-permanent shrinkage, expansion or deterioration phenomenon after construction.

Figure 1 is a schematic diagram of ground reinforcement repair construction.
Figure 2 is a schematic diagram of the ground repair and reinforcement construction using the eco-friendly two-component ground reinforcement material of the present invention.
Figure 3 is a photograph taken of UPC construction using the eco-friendly two-component ground reinforcement and repair material of the present invention.

Hereinafter, the present invention will be described in more detail through a ground reinforcement repair construction method using the UPC (Urethane power consolidation) method.

The UPC method is a method that fills the gap (or void) in the ground by infiltrating a rapidly expanding material into the gap (or void) of the ground (soft ground) with insufficient bearing capacity, strengthening the bearing capacity of the ground and increasing the shear force at the same time (Figure 1).

The present invention relates to a ground reinforcement repair construction method using the UPC method and a two-component urethane-based ground reinforcement repair agent used therein. The first step is to confirm the ground to be reinforced; Step 2: drilling the confirmed reinforcement target ground and then inserting the injection pipe into the hole; First liquid storage tank. 3 steps of connecting the injection pipe with the injection hose of the injection device connected to the second liquid storage tank and the hydraulic compressor, then mixing and injecting the first and second liquids of the two-component urethane-based ground reinforcement repair agent through the injection device. ; And after confirming the level of the ground due to the expansion of the ground reinforcement and repair agent, removing the injection hose from the injection pipe and sealing the perforation to finish the process, the process including the following is performed to reinforce and/or repair the ground. can do.

Steps 2 to 4 may be performed while observing the displacement of the surface layer and/or deep ground using a laser level (see Figure 2).

The three-stage ground reinforcement and repair agent is a two-component type, the first liquid containing a polyether polyol mixture containing a high molecular weight polyether polyol and a low molecular weight polyether polyol; and a second liquid containing diisocyanate, wherein the first liquid is supplied to the injection device from the first liquid storage tank, the second liquid is supplied to the injection device from the second liquid storage tank, and the injection device (injection As soon as it is mixed in the gun, it moves to the injection pipe through the injection hose and is injected into the void (or gap) of the ground to be reinforced where the injection pipe is installed. After the first and second liquids are mixed, foaming proceeds quickly, and as the foaming occurs, the sunken ground rises, while observing the displacement of the surface layer and/or deep ground visually or through a laser level. The injection amount of ground reinforcement and repair agents (first and second liquids) can be adjusted. And, at this time, it is preferable to sequentially inject the injection pressure at a pressure of 900 to 1500 psi, preferably 900 to 1200 psi, and more preferably 920 to 1150 psi.

The mixing ratio of the first liquid and the second liquid is 1:0.95 to 1.2 weight ratio, preferably 1:0.98 to 1.15 weight ratio, more preferably 1:1 to 1.10 weight ratio to control the appropriate expansion speed and expand the cured foam. is desirable in terms of mechanical properties.

Describing the two-component urethane-based ground reinforcement and repair agent in detail, the polyether polyol mixture among the first liquid components consists of high molecular weight polyether polyol and low molecular weight polyether polyol in a weight ratio of 1:3.0 to 6.0, preferably 1: It may be included at a weight ratio of 4.0 to 5.5, more preferably at a weight ratio of 1:4.5 to 5.2. At this time, if the low molecular weight polyether polyol used is less than 3.0 weight ratio, the foaming power of the ground reinforcement repair agent may be insufficient, and if it is used in excess of 6.0 weight ratio, the foaming power is good, but problems with insufficient mechanical properties may occur, so use it within the above range. It's good to do it.

In addition, it is preferable that the viscosity of the first liquid is 180 to 250 cps (25°C) and that the viscosity of the second liquid is 200 to 250 cps (25°C) in terms of mixing and workability.

In addition, among the first liquid components, the high molecular weight polyether polyol and low molecular weight polyether polyol may satisfy Equation 1 below, and high molecular weight polyether polyol and low molecular weight polyether polyol having a weight average molecular weight outside the range below are used. In this case, there may be problems in that appropriate foaming power cannot be expressed, the ground reinforcement repair agent hardens too quickly, or the curing time is delayed, resulting in poor constructability (workability).

[Equation 1]

0.130 < A/B < 0.400, preferably 0.180 < A/B < 0.350, more preferably 0.200 < A/B < 0.300

In Equation 1, A is the weight average molecular weight of the low molecular weight polyether polyol, and B is the weight average molecular weight of the high molecular weight polyether polyol.

More specifically, the first liquid may include the low molecular weight polyether polyol, the high molecular weight polyether polyol, a polyester polyol with a functional group of 1.5 to 2.5, a moisture reaction inhibitor, a crosslinking agent, a foam stabilizer, a catalyst, a foaming agent, and a flame retardant. there is.

Among the first liquid components, the low molecular weight polyether polyol may include polyoxy (C ₂ to C ₃ alkylene) glycol with a weight average molecular weight of 200 to 600, preferably polyoxy with a weight average molecular weight of 350 to 450. May contain ethylene glycol. The amount of low molecular weight polyether polyol used is the remaining amount in the first liquid excluding other compositions that will be described below.

Among the first liquid components, the high molecular weight polyether polyol is a polyoxyalkylene triol, preferably polyoxy(C ₂ to C ₇ alkylene)triol, more preferably polyoxy(C ₃ to C ₅ alkylene)triol. It may be an alkylene)triol. In addition, the high molecular weight polyether polyol may have 2 to 3 functional groups, a weight average molecular weight of 1,000 to 3,000, and a hydroxyl group of 50 to 150 mg KOH/g, and preferably has a functional group of 2 to 3, a weight average molecular weight of 1,000 to 1,800, and a hydroxyl group of 100. It may be ~ 130 mg KOH/g, and more preferably, it may be functional group 3, weight average molecular weight of 1,200 ~ 1,800, and hydroxyl group of 100 ~ 120 mg KOH/g.

Among the first liquid components, the polyester polyol plays a role in increasing hydrophobicity and strength, and has a functional group of 1.5 to 2.5 and a hydroxyl group of 300 to 400 mg KOH/g, preferably a functional group of 1.5 to 2.0 and a hydroxyl group of 300 to 350 mg. It is KOH/g. As an example of the polyester polyol, Aekyung Petrochemical Co., Ltd.'s product names POL-1001, POL-1002, POL-1004, POL-1005, POL-3001, etc. can be used.

In addition, the amount of polyester polyol used may include 5 to 10% by weight, preferably 5 to 8% by weight, and more preferably 5 to 7.5% by weight, based on the total weight% of the first liquid. In this case, the If the content is less than 5% by weight, the hydrophobic effect may be insufficient and there may be a problem of insufficient strength. If the content exceeds 10% by weight, shrinkage of the ground reinforcement and repair agent may occur, which may cause problems, so it is recommended to use it within the above range.

Among the first liquid components, the moisture reaction inhibitor serves to prevent the ground reinforcement and repair agent from deforming the expanded and hardened foam due to moisture in the ground, and includes one or more vegetable oils selected from castor oil, soybean oil, and corn oil. It can be done, preferably at least one selected from castor oil and soybean oil,

More preferably, it may contain castor oil. The amount of the moisture reaction inhibitor used may include 8 to 10% by weight, preferably 8.5 to 10% by weight, and more preferably 8.5 to 9.5% by weight, based on the total weight% of the first liquid. If it is less than 10% by weight, the moisture resistance of the expanded and hardened foam is not good, and deformation may occur due to long-term moisture, water, etc., shortening the lifespan. If it exceeds 10% by weight, the foaming power and flowability of the ground reinforcement repair agent are hindered. Since it may shrink, it is best to use it within the above range.

Among the components of the first liquid, the crosslinking agent is a chain extender and can be a general crosslinking agent used in the industry, preferably ethylene glycol, triethanolamine, 1,3-propanediol, 1,2-butanediol, and 1,4-butanediol. , 2-ethyl-1,3-hexanediol, 2-methyl-1,3-propanediol, and 1,6-cyclohexanediol, and more preferably ethylene glycol and triethanolamine. , 1,3-propanediol, and 1,4-butanediol may be used. At this time, the amount of the crosslinking agent used may include 5 to 8% by weight, preferably 5.5 to 9% by weight, and more preferably 6.0 to 8.5% by weight, based on the total weight% of the first liquid. In this case, the amount of crosslinking agent used is If it is less than 5% by weight, the mechanical properties of the foam may be poor, and if it exceeds 8% by weight, the foaming power (expansion rate) may decrease and the curing time of the foam may be delayed, so it is recommended to use it within the above range.

Among the first liquid components, the foaming agent plays a role in uniformizing and maintaining the shape of the foamed cells. Common foaming agents used in the industry can be used, preferably silicone or silicone glycol copolymer ( It is recommended to use silicone-based foaming agents such as silicon glycol copolymer and polysiloxane ether. For example, Evonic's brand name B-8402, B-8870, B-8006, Union Carbicle's brand name L-520, L-540, L-5340, L-5420, Dow Corning's brand name DC-5604, DC-192, DC-193, DC-194, DC-195, etc. can be used. The amount of the foam stabilizer used may include 2 to 5% by weight, preferably 2 to 4% by weight, and more preferably 2.2 to 3.5% by weight, based on the total weight% of the first liquid. The amount of foam stabilizer used is 2. If it is less than 5% by weight, the physical properties of the foam may not be uniform due to poor uniformity of cells formed by foaming. If the amount of foaming agent used exceeds 5% by weight, the cells are opened excessively and a large number of open cells are generated, greatly reducing the mechanical properties of the foam. There may be a problem of decline.

Among the first liquid components, the catalyst serves to promote urethane reaction and curing at room temperature, and may include one or more types selected from tertiary amine-based catalysts and organometallic catalysts, preferably tertiary amine-based catalysts. Catalysts and organometallic catalysts can be mixed and used, and more preferably, tertiary amine catalysts and organometallic catalysts are mixed at a weight ratio of 1:0.20 to 0.40, preferably 1:0.22 to 0.28. In addition, the amount of the catalyst used may include 1.5 to 3.0% by weight, preferably 1.5 to 2.5% by weight, and more preferably 1.5 to 2.2% by weight, based on the total weight% of the first liquid, and the amount of catalyst used is 1.5% by weight. If it is less than 3.0% by weight, there may be a problem that the foaming speed of the ground reinforcement repair agent is slow and/or the curing time is too delayed, and if it exceeds 3.0% by weight, the curing time is too fast, causing fractures between gaps in the ground. Since the ground reinforcement repair agent, which expands and foams, hardens before being injected, there may be a problem of poor constructability, so it is recommended to use it within the above range.

The tertiary amine catalyst includes trialkylamines such as triethylamine, triethyldiamine, and ethylenediamine, 4-dimethylaminopyridine, benzyldimethylamine, 2,4,6-tris (dimethylaminomethyl)phenol, 1, Compounds such as 8-diazabicyclo (5,4,0)-undecene can be used alone or in combination.

In addition, as the organometallic catalyst, it is recommended to use a highly active catalyst to prevent a decrease in the reactivity of the polyisocyanate compound during foaming. For example, the organic tin catalyst dibutyltin dilaurate (DBTDL) can be used. .

In addition, water and/or a fluorocarbon-based foaming agent can be used as the foaming agent, and it is preferable to use water alone from an environmental standpoint. An example of the fluorocarbon-based blowing agent may be dichlorofluoroethane (CH ₃ CFCl ₂ ) such as HCFC-141 and HCFC-141b. In addition, it is advantageous to use 2 to 10% by weight of the foaming agent, preferably 2 to 5% by weight, in terms of securing appropriate foaming power.

The first liquid described above may further include other additives such as low molecular weight polyether polyol, high molecular weight polyether polyol, polyester polyol, moisture reaction inhibitor, crosslinking agent, foam stabilizer, catalyst, and foaming agent, such as flame retardant and admixture.

The flame retardants include tris(2-chloropropyl)phosphate (TCPP), tris(2-chloroethyl) phosphate (TCEP), and chlorinated paraffins. Halogen-based flame retardants such as; Alternatively, a phosphorus-based flame retardant such as triethyl phosphate can be used. In addition, the amount of flame retardant used may be 10 to 17% by weight, preferably 10 to 15.0% by weight, and more preferably 12.0 to 15.0% by weight of the total weight of the first liquid. In this case, the amount of flame retardant used is less than 10% by weight. The flame retardant effect on the back may be minimal, and if used in excess of 17% by weight, it may adversely affect the foaming power and actually lower the compressive strength of the foamed ground reinforcement and repair material, so it is recommended to use it within the above range.

Additionally, the mixed first liquid component has a viscosity of about 180 to 250 cps at 25°C and a specific gravity of 1.05 (±0.05).

Next, the second liquid contains a fluidizing agent and diisocyanate as curing components, preferably 3.0 to 7.0% by weight of the fluidizing agent and the remaining amount of diisocyanate, more preferably 4.2 to 5.5% by weight of the fluidizing agent and the remaining amount of diisocyanate. May contain isocyanate.

The fluidizing agent is used to increase the flowability and hydrophobicity of the delayed reinforcement repair agent mixed with the first liquid and the second liquid, such as epoxidized soybean oil (ESO), polycarbonate. It may include one or more types selected from acid-based (PC) surfactants and polymelamine sulfonate sodium condensate-based (PMS) surfactants. At this time, if the amount of fluidizer used is less than 3% by weight of the total weight of the second liquid, the amount used may be too small and the effect of using it may be minimal, and if it exceeds 7% by weight, a large amount of open cells may occur in the foam, which may lower the mechanical properties. Therefore, it is recommended to use it within the above range.

In addition, the diisocyanate may include one or more selected from diphenylmethane diisocyanate (MDI), modified MDI, polymeric MDI, and toluene diisocyanate (TDI), and preferably MDI is contained in an amount of 93 to 97% by weight. More preferably, it is included at 94.5 to 95.2% by weight in terms of securing appropriate mechanical properties (compressive strength, bending strength, etc.), appropriate foaming power, and appropriate curing time of the cured foam.

In addition, the MDI may be used with an NCO content of 30 to 32% by weight, specific gravity of 1.20 to 1.25, boiling point of 200 to 210°C, and flash point of 175 to 220°C, and preferably specific gravity of 1.22 to 1.25 and boiling point of 205 to 210°C. , flash point of 177 to 218℃, and viscosity of 150 to 250 cps (25℃) can be used.

The modified MDI may have an NCO content of 35 to 40% by weight, preferably 36.5 to 40% by weight, and more preferably 37 to 39% by weight. In addition, the modified MDI may be used with a specific gravity of 1.20 to 1.25, a boiling point of 200 to 210°C, and a flash point of 175 to 220°C, and preferably a specific gravity of 1.21 to 1.23, a boiling point of 205 to 210°C, and a flash point of 177 to 218°C. You can.

In addition, the polymeric MDI may have an NCO content of 25 to 35% by weight, preferably an NCO content of 27.5 to 34% by weight, and more preferably an NCO content of 30.0 to 32.5% by weight. Additionally, the polymeric MDI may have a viscosity of 100 to 250 cps (25°C), preferably 150 to 250 cps (25°C).

And, the second liquid component has a viscosity of about 200 to 250 cps at 25°C and a specific gravity of 1.25 (±0.05).

When the purpose of the two-component ground repair and repair construction method using the UPC method of the present invention is ground reinforcement, the expansion ratio is preferably about 12 to 15 times, and the use of the two-component ground repair and reinforcement agent is reinforcement and ground raising. In this case, the expansion ratio is preferably about 20 to 25 times.

The specific gravity of the foam made of two-component ground repair reinforcement varies depending on the foaming ratio. When the foaming ratio is 10 to 15 times, the specific gravity of the foam is about 60 to 90 kg/m ³ , and when the foaming ratio is 20 to 25 times, the foam Specific gravity is about 40 to 50 kg/m ³ .

In addition, after mixing liquid 1 and liquid 2, the foaming start (CT cream time) is about 10 to 20 seconds at 20℃, preferably 10 to 15 seconds, which has an appropriate foaming time, and the complete curing time is the same for liquid 1 and liquid 2. After mixing, it is within 45 seconds at 20°C, preferably within 40 seconds, more preferably within 30 to 35 seconds at 20°C.

The compressive strength of the foam formed by completely foaming the two-component ground repair reinforcing agent of the present invention is 30 to 40 N/cm 2 when the expansion ratio is 20 to 25 times, and 80 to 100 N/cm ² when the expansion ratio is 12 to 15 times ^. You can.

The UPC construction method of the ground of the present invention fills the gap of the ground by infiltrating the eco-friendly two-component urethane-based ground reinforcement repair agent of the present invention into the ground with insufficient bearing capacity, strengthening the bearing capacity of the ground and increasing the shear force at the same time. It is a construction method (see Figures 1 and 2).

The UPC construction method of the ground using the two-component ground repair and reinforcing agent of the present invention described above is used not only in areas of ground damage due to ground subsidence on roads, sidewalks, runways, trains, and buildings, but also in narrow spaces (offices, workshops, etc. in buildings). It is possible to reinforce and repair the ground in a short time for damaged areas of the ground, and eco-friendly construction is possible without causing pollution to the surrounding environment.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples do not limit the scope of the present invention, and should be interpreted to aid understanding of the present invention.

[Example]

Example 1: Manufacture of two-component urethane-based ground reinforcement repair agent for UPC method

(1) Preparation of first liquid

Polyoxyethylene glycol with a weight average molecular weight of about 390 to 430 (median 410) was prepared as a low molecular weight polyether polyol.

A polyoxy(C ₃ alkylene)triol with a weight average molecular weight of about 1300 to 1700 (median value 1,500), a hydroxyl group (OH value) of 100 to 120 mg KOH/g, and a three-functional group is converted into a high molecular weight polyether polyol (manufacturer: Prepared by N Chemical Co., Ltd.

In addition, a polyester polyol (manufacturer: Aekyung Petrochemical Co., Ltd., product name: POL-1001) with a functional group of 1.5 to 2.0, a hydroxyl group of 300 to 350 KOH mg/g, and a specific gravity of 1.2 to 1.3 was prepared.

A polyether polyol mixture was prepared by mixing the high molecular weight polyether polyol and the low molecular weight polyether polyol at a weight ratio of 1:5.

Next, 5.0% by weight of the polyester polyol, 9% by weight of castor oil (moisture reaction inhibitor), 6.0% by weight of ethylene glycol (crosslinking agent), 2.5% by weight of silicone-based foam stabilizer (DC-193 from Dow Coating), triethylamine ( 2.2% by weight of a catalyst containing a tertiary amine catalyst) and an organometallic catalyst in a 1:0.25 weight ratio, 4% by weight of water (blowing agent), 15.0% by weight of tris (2-chloropropyl) phosphate (TCPP, flame retardant), and the balance. The first liquid was prepared by mixing the polyether polyol mixture.

The organometallic catalyst is dibutyltin diaurate (DBTDL), which is an organic tin catalyst.

The viscosity of the prepared first liquid is 200 to 230 cps (25℃) and the specific gravity is 1.03 to 1.07.

(2) Preparation of second liquid

MDI (manufacturer: Kumho Mitsui Chemicals) with an NCO content of 30 to 32% by weight, specific gravity of 1.24 (±0.05), and viscosity of 200 to 250 (25°C) was prepared.

Then, a second liquid was prepared by mixing 3.2% by weight of epoxidized soybean oil (ESO) and 96.8% by weight of the MDI as a fluidizing agent.

The viscosity of the prepared second liquid was 200 to 240 cps (25°C).

Example 2

Prepare the first and second liquids with the same composition and composition ratio as in Example 1, except that when preparing the first liquid, instead of low molecular weight polyether polyol with a weight average molecular weight of about 390 to 430 (median value 410), a weight average molecular weight of about 410 is used. A low molecular weight polyether polyol with a molecular weight of 510 to 550 (median 530) was used.

Example 3

Prepare the first and second liquids with the same composition and composition ratio as in Example 1, except that when preparing the first liquid, instead of low molecular weight polyether polyol with a weight average molecular weight of about 390 to 430 (median value 410), a weight average molecular weight of about 410 is used. A low molecular weight polyether polyol with a molecular weight of 220 to 260 (median 240) was used.

Comparative Example 1

Prepare the first and second liquids with the same composition and composition ratio as in Example 1, except that when preparing the first liquid, instead of low molecular weight polyether polyol with a weight average molecular weight of about 390 to 430 (median value 410), a weight average molecular weight of about 410 is used. A low molecular weight polyether polyol with a molecular weight of 620 to 640 (median 630) was used.

Comparative Example 2

Prepare the first and second liquids with the same composition and composition ratio as in Example 1, except that when preparing the first liquid, instead of low molecular weight polyether polyol with a weight average molecular weight of about 390 to 430 (median value 410), a weight average molecular weight of about 410 is used. A low molecular weight polyether polyol with a molecular weight of 150 to 190 (median 170) was used.

Examples 4 to 6 and Comparative Examples 3 to 6

The first and second liquids were prepared with the same composition and composition ratio as in Example 1, but the first liquid was prepared with different composition ratios as shown in Table 1 below, and Examples 4 to 6 and Comparative Examples 3 to 6 were prepared, respectively. It was carried out.

division
(weight%) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Moisture reaction inhibitor 9.0 9.0 9.0 9.0 9.0 9.0 crosslinking agent 6.0 6.0 6.0 6.0 6.0 6.0 antiseptic 2.5 2.5 2.5 2.5 2.5 2.5 catalyst 2.2 2.2 2.2 2.2 2.3 2.0 blowing agent 4.0 4.0 4.0 4.0 4.5 2.5 flame retardant 15.0 15.0 15.0 15.0 15.0 15.0 polyester polyol 5.0 5.0 5.0 5.0 6.5 5.0 Polyol mixture ⁽¹⁾ Remaining amount 100% by weight Weight ratio ⁽²⁾ 1:5 1:5 1:5 1:5.5 1:4.0 1:5 Equation 1 ⁽³⁾ 0.273 0.353 0.160 0.273 0.273 0.273 (1) Polyol mixture: mixture of high molecular weight polyether polyol and low molecular weight polyether polyol
(2) Mixing weight ratio of low molecular weight polyether polyol to high molecular weight polyether polyol
(3) Equation 1 = A/B, where A is the weight average molecular weight of the low molecular weight polyether polyol, and B is the weight average molecular weight of the high molecular weight polyether polyol. And, in the examples, it was calculated as the median of the weight average molecular weight of each polyol.

division
(weight%) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Moisture reaction inhibitor 9.0 9.0 9.0 9.0 9.0 9.0 crosslinking agent 6.0 6.0 6.0 6.0 6.0 6.0 antiseptic 2.5 2.5 2.5 2.5 2.5 2.5 catalyst 2.2 2.2 2.2 2.2 2.3 2.0 blowing agent 4.0 4.0 4.0 4.0 1.5 6.0 flame retardant 15.0 15.0 15.0 15.0 15.0 15.0 polyester polyol 5.0 5.0 5.0 5.0 6.5 5.0 Polyol mixture ⁽¹⁾ Remaining amount 100% by weight Weight ratio ⁽²⁾ 1:5 1:5 1:6.35 1:2.64 1:5 1:5 Equation 1 ⁽³⁾ 0.420 0.113 0.273 0.273 0.273 0.273 (1) Polyol mixture: mixture of high molecular weight polyether polyol and low molecular weight polyether polyol
(2) Mixing weight ratio of low molecular weight polyether polyol to high molecular weight polyether polyol
(3) Equation 1 = A/B, where A is the weight average molecular weight of the low molecular weight polyether polyol, and B is the weight average molecular weight of the high molecular weight polyether polyol. And, in the comparative example, it was calculated as the median value of the weight average molecular weight of each polyol.

Experimental Example 1: Measurement of expansion ratio, curing time, and compressive strength

The first and second solutions prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were stirred for 7 seconds at a weight ratio of 1:1.08 with a stirrer (stirring speed of 1,5000 rpm) and then measured for reaction start time (CT). ) and the expansion rate (or expansion rate) of the ground reinforcement repair agent were measured under the condition of an external temperature of 20°C to measure the expansion rate, expansion start time, and complete curing time, and the results are shown in Table 3 below.

At this time, the expansion ratio was measured based on Equation 1 below.

[Equation 1]

Expansion ratio = (volume after expansion/volume before expansion)

Compressive strength was measured according to KS F 4919 after complete curing.

division Expansion ratio
(20℃) firing
Start time
(CT,20℃) full cure time
(TFT, 20℃) compressive strength
(N/ ^cm2 ) Example 1 19.2 times 15 seconds 38 seconds 35.4 Example 2 16.7 times 12 seconds 33 seconds 39.1 Example 3 18.4 times 13 seconds 38 seconds 37.0 Example 4 22.0 times 13 seconds 40 seconds 32.2 Example 5 24.6 times 10 seconds 31 seconds 31.1 Example 6 15.2 times 15 seconds 34 seconds 80.9 Comparative Example 1 15.8 times 9 seconds 29 seconds 68.8 Comparative Example 2 17.5 times 19 seconds 52 seconds 36.2 Comparative Example 3 23.3 times 21 seconds 55 seconds 28.1 Comparative Example 4 25.8 times 11 seconds 27 seconds 23.3 Comparative Example 5 9.7 times 14 seconds 35 seconds 90.5 Comparative Example 6 25.3 times 15 seconds 51 seconds 22.3 *CT = CREAM TIME, *TFT=TACK FREE TIME

Looking at the physical property measurement results in Table 1, Examples 1 to 6 show overall excellent foaming power with a foaming ratio of 15 times or more, with an appropriate foaming start time in the range of 10 to 20 seconds and preferably within 50 seconds. In other words, it had a complete curing time of less than 45 seconds and showed excellent compressive strength measurement results of 30 to 90 N/cm ² .

On the other hand, in relation to the weight average molecular weight of the high molecular weight polyether polyol and low molecular weight polyether polyol used, in the case of Comparative Example 1, where the Equation 1 value was 0.420 exceeding 0.400, when compared with Examples 1 and 2 , the compressive strength is high, but the expansion ratio is low, the foaming start time is too fast, and the complete curing time is unstable, which can cause problems that reduce constructability during UPC construction.

In addition, in the case of Comparative Example 2, where the Equation 1 value was 0.113, which is less than 0.130, compared to Examples 1 and 3, the expansion ratio was rather low, and the expansion start time and curing time were delayed, but the improvement in compressive strength was minimal or , but rather showed lower results.

In addition, in the case of Comparative Example 3, in which high molecular weight polyether polyol and low molecular weight polyether polyol were used at a weight ratio of 1:6.35, which exceeded the 1:6.0 weight ratio, the foaming power was very high compared to Examples 1 and 4. There was a problem that the foaming initiation time and curing time were too long, and the compressive strength was greatly reduced. In addition, although the compressive strength was excellent, there was a problem with the foaming power being too low.

In the case of Comparative Example 4, in which high molecular weight polyether polyol and low molecular weight polyether polyol were used at a weight ratio of 1:2.64, which is less than 1:3.0 weight ratio, compared to Examples 1 and 5, the expansion ratio was very high, but the compressive strength was low. There was a problem where the was significantly lowered.

In addition, in the case of Comparative Example 5 in which less than 2.0% by weight of the foaming agent was used, there was a problem in that the foaming power was rapidly reduced compared to Example 6, and in the case of Comparative Example 6 in which the foaming agent was used in more than 5.0% by weight, the Compared to Example 1, there was a problem that the full curing time was too long and the compressive strength was too low.

Manufacturing Example 1: UPC method construction for submerged ground

Using the eco-friendly two-component urethane-based ground reinforcement repair agent (first liquid, second liquid) prepared in Example 1, the ground reinforcement repair agent was injected into the subsiding ground as shown in FIG. 2 through an injection device to cause settlement through the UPC method. Reinforcement repairs were performed on the damaged ground.

To be more specific, the ground subject to reinforcement was first identified. Next, after drilling a hole in the ground to be reinforced, the injection pipe of the injection device was installed and inserted into the hole. At this time, the injection device is the first liquid storage tank. They are each connected to the second liquid storage tank and hydraulic compressor.

After installing the laser level, the first liquid of the two-component urethane-based ground reinforcement repair agent (viscosity at 25°C = 190 to 220 cps) and the second liquid (at 25°C) are injected through the injection device. Viscosity = 200 ~ 220 cps) was mixed and injected.

At this time, the injection pressure was sequentially injected at low pressure of about 1000 to 1050 psi, and the mixing ratio of the first liquid and the second liquid was 1:1.08 by weight.

The mixing ratio of the first liquid and the second liquid is 1:0.95 ~ 1.2 volume ratio, preferably 1: 0.98 ~ 1.15 volume ratio, more preferably 1: 1 ~ 1.10 volume ratio to control the appropriate expansion speed and expand the cured foam. is desirable in terms of mechanical properties.

When injection was completed, the level of the ground was checked due to the expansion of the ground reinforcement and repair agent, the injection hose was removed from the injection pipe, the hole was sealed and finished, and UPC construction was completed (see Figure 3).

Claims (8)

A first liquid containing a polyether polyol mixture containing high molecular weight polyether polyol and low molecular weight polyether polyol satisfying the following equation 1 in a weight ratio of 1:3 to 6; and
It includes a second liquid containing diisocyanate,
The low molecular weight polyether polyol includes polyoxy (C ₂ to C ₃ alkylene) glycol with a weight average molecular weight of 200 to 600,
The high molecular weight polyether polyol is an eco-friendly two-component urethane-based ground reinforcement repair agent for UPC (Urethane power consolidation) construction, characterized in that it contains polyoxyalkylene triol with a weight average molecular weight of 1,000 to 3,000.
[Equation 1]
0.130 < A/B < 0.400
In Equation 1, A is the weight average molecular weight of the low molecular weight polyether polyol, and B is the weight average molecular weight of the high molecular weight polyether polyol.
The method of claim 1, wherein the first liquid contains 4 to 10% by weight of polyester polyol, 8 to 10% by weight of moisture reaction inhibitor, 5 to 8% by weight of crosslinking agent, 2 to 5% by weight of foam stabilizer, and 1.5 to 3.0% by weight of catalyst. , an eco-friendly two-component urethane-based ground reinforcement repair agent for UPC construction, comprising 2 to 5% by weight of a foaming agent, 10 to 17% by weight of a flame retardant, and the remaining amount of mixed polyether polyol.
The eco-friendly two-component urethane-based ground reinforcement repair agent for UPC construction according to claim 1, wherein the second liquid contains 3 to 7% by weight of a fluidizing agent and the remaining amount of diisocyanate.
The eco-friendly two-component urethane-based ground for UPC construction according to claim 1, wherein the high molecular weight polyether polyol includes a polyoxyalkylene triol with a hydroxyl value of 50 to 150 mg KOH/g and a functional group of 2 to 3. Reinforcement repair agent.
The method of claim 2, wherein the crosslinking agent is ethylene glycol, triethanolamine, 1,3-propanediol, 1,2-butanediol, 1,4-butanediol, 2-ethyl-1,3-hexanediol, and 2-methyl-1. , Contains at least one selected from 3-propanediol and 1,6-cyclohexanediol,
The catalyst is an eco-friendly two-component urethane-based ground reinforcement repair agent for UPC construction, characterized in that it contains one or more types selected from tertiary amine-based catalysts and organometallic catalysts.
The method of claim 3, wherein the diisocyanate includes at least one selected from diphenylmethane diisocyanate (MDI), modified MDI, polymeric MDI, and toluene diisocyanate (TDI),
The fluidizing agent is characterized in that it contains at least one selected from epoxidized soybean oil (ESO), polycarboxylic acid (PC) surfactant, and polymelamine sulfonate sodium condensate (PMS) surfactant. An eco-friendly two-component urethane-based ground reinforcement repair agent for UPC construction.
As a construction method for reinforcing and repairing the ground,
A UPC construction method for the ground using a two-component urethane-based ground reinforcement and repair agent selected from any one of claims 1 to 6.
In clause 7,
Step 1: Check the ground for reinforcement;
Step 2: drilling the confirmed reinforcement target ground and then inserting the injection pipe into the hole;
First liquid storage tank. 3 steps of connecting the injection pipe with the injection hose of the injection device connected to the second liquid storage tank and the hydraulic compressor, then mixing and injecting the first and second liquids of the two-component urethane-based ground reinforcement repair agent through the injection device. ; and
A UPC construction method for ground comprising the following four steps: confirming the level of the ground due to expansion of the ground reinforcement and repair agent, removing the injection hose from the injection pipe, and sealing and finishing the perforation.