KR20220132310A - 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 restorative material for ground reinforcement used for a urethane power consolidation (UPC) construction method. More specifically, the present invention relates to a restorative material for ground reinforcement having a high foaming ratio (or an expansive force) as well as excellent curing speed and compressive strength, and to a UPC construction method using the same.

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 reinforcing repair agent for the UPC method for repairing and/or reinforcing soft ground lacking bearing capacity of roads, railways, runways, sidewalks, factories, building foundations, etc. and UPC construction method of the ground using the same it's about

Civil engineering buildings such as general roads, highways, railways, factories, buildings, and houses are generally formed on the ground, and steps are generated in the base ground due to subsidence of the base ground, the influence of adjacent structures, poor construction, etc. There is a problem in that civil engineering buildings are tilted or damaged and their lifespan is shortened.

In general, construction work for reinforcing the foundation ground or repairing the submerged ground is continuously being performed, and among them, the foundation for the purpose of solidifying the ground, increasing the bearing capacity of the ground, reducing the permeability, and integrating the ground with the structure. Grouting construction in which grout containing cement, such as various cements, mortars, and pharmaceuticals, as a main component, is injected into the ground or around the structure and into the structure itself is often carried out.

The cement grouting method is a method of injecting cement grout into a gap in the soil or rock by using an injection pump, etc. It is a method of improving water-repellent properties by increasing the bearing capacity of the target ground and reducing the permeability coefficient by allowing the ground to solidify by

However, the construction of such cement grouting is complicated and complicated. For example, when the surface of the asphalt road is curved or damaged due to the occurrence of a step, the asphalt road of the part to be grouted is removed. At this time, there is a problem that the construction method is very complicated and takes a long time, causing traffic congestion for a long time because the asphalt road must be reconstructed after removing the asphalt road in a very wide area and performing grouting construction.

In addition, the cement grout material used for cement grouting construction has a low cost and guarantees a constant strength, but has a long hardening period and a large load, so its effectiveness is low in soft ground.

In particular, under soft ground, steel pipe multi-stage injection method or urethane-based chemical liquid injection method is applied. The steel pipe multi-stage injection method has good effects of strength improvement and load reduction, but has a low water-reinforcement effect, and the process required for reinforcement work is very large for the excavation process. It is very unfavorable to align the air because it affects the air. Also, if there is a lot of groundwater outflow, the water blocking effect is hardly expected, so the application range is very limited. In addition, the LW (Labels Wasser Glass)-based chemical injection method and the SGR (Space Grouting Rocket System)-based chemical injection method are a method developed by focusing on the phenomenon that when a water glass chemical solution and a cement suspension are mixed, it becomes a gel (GEL). It has the advantage of low material and construction costs because it does not generate waste, but it requires large-scale facilities and other complex mechanical equipment such as boring machines must be installed in the hole. There is a disadvantage that the planned construction is difficult because the influence of

And, the polyurethane injection method started construction from the 1990s as the bedrock solidification method (PUIF), and the polyurethane injection method drills holes at regular intervals in the soft strata, fracture zones and fault zones, and then inserts injection bolts, and this inserted injection A two-component foaming urethane-based chemical is mixed in the bolt and a pressure of about 20 kg/cm ² is applied to completely fill the gaps between the arm pins of the bedrock with developed joints, thereby forming a single rock body in the form of an arch and supporting the load on the bedrock at the top of the tunnel. It is a technique to prevent

The urethane-based chemical injection agent used in the conventional polyurethane injection method uses a two-component urethane chemical liquid composed of the main solution A and the curing agent B solution. There is a limited problem with the ground that can be reinforced and/or repaired.

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

Existing urethane-based repair agents applied to the polyurethane injection method have a problem in that they do not secure sufficient mechanical strength when the foaming power is low or when the foaming power is good. The present invention was completed by knowing the optimal composition and composition ratio of the water retaining agent. That is, the present invention is to provide a two-component urethane-based ground reinforcing agent for UPC (Urethane power consolidation) construction and a UPC construction method of the ground using the same.

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

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

As a preferred embodiment of the present invention, the high molecular weight polyether polyol and the low molecular weight polyether polyol among the ground reinforcement and repair agent components 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 solution 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.

As a preferred embodiment of the present invention, the first liquid comprises 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, 1.5 to catalyst 3.0% by weight, 2 to 10% by weight of a blowing agent, 10 to 17% by weight of a flame retardant, and the balance of the polyether polyol mixture.

As a preferred embodiment of the present invention, the high molecular weight polyether polyol may include a polyoxyalkylene triol having a hydroxyl group 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 having 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 at least one vegetable oil 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 at least one selected from methyl-1,3-propanediol and 1,6-cyclohexanediol.

As 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 at least one selected from a tertiary amine-based catalyst and an organometallic catalyst.

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 contain 3 to 5% by weight of the fluidizing agent and the remaining amount of diisocyanate.

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

As a preferred embodiment of the present invention, the diisocyanate may include at least one 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 and repair construction method through the UPC method using the above-described ground reinforcement and repair agent.

As a preferred embodiment of the present invention, the ground reinforcement and repair construction method of the present invention includes the first step of confirming the ground to be reinforced; After drilling the confirmed reinforcement target ground, the second step of inserting the injection pipe into the drilling; 1st liquid storage tank. After connecting the injection pipe and the injection hose of the injection device connected to the second liquid storage tank and the hydraulic compressor, respectively, a third step of mixing and injecting the first liquid and the second liquid of the two-component urethane-based ground reinforcing agent through the injection device ; And after confirming the level of the ground due to the expansion of the ground reinforcement agent, removing the injection hose from the injection pipe, sealing the perforation and finishing the 4 step; can

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

The ground reinforcement and repair material for the UPC method of the present invention has a high compressive strength and flexural strength while having a high expansion force of about 5 to 25 times, and has a fast curing rate, so that the ground reinforcement and repair are possible in a short time. And, since the injection amount and injection time can be easily finely adjusted during the ground reinforcement and/or repair construction using the ground reinforcement material, the workability is good, and there is no uplift phenomenon around the ground reinforcement and watering, and the outside of the ground reinforcement material Leakage and loss can be prevented. In addition, the ground reinforcement and repair construction method through the UPC method can be constructed even on a soft ground that does not need to increase the superimposed load of the ground itself, and it can be constructed in a narrow space (office, workroom, etc. in a building). In addition, since the expanded foam of the constructed and foamed ground reinforcement material is not affected by the ambient temperature, there is no semi-permanent shrinkage, expansion and deterioration after construction.

1 is a schematic view of the ground reinforcement and repair construction.
2 is a schematic schematic view of repairing and reinforcing the ground with the eco-friendly two-component ground reinforcing material of the present invention.
3 is a photograph taken when UPC construction is performed using the eco-friendly two-component ground reinforcing material of the present invention.

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

The UPC method is a method of infiltrating a rapidly expanding material into the gap (or void) of the ground (soft ground) with insufficient bearing capacity to fill the gap (or void) of the ground while strengthening the bearing capacity of the ground and increasing the shear force at the same time (Fig. see 1).

The present invention relates to a ground reinforcement and repair construction method through the UPC method and a two-component urethane-based ground reinforcement repair agent used therein, comprising: a first step of confirming the ground to be reinforced; After drilling the confirmed reinforcement target ground, the second step of inserting the injection pipe into the drilling; 1st liquid storage tank. After connecting the injection hose and the injection pipe of the injection device connected to the second liquid storage tank and the hydraulic compressor, the first liquid and the second liquid of the two-component urethane-based ground reinforcing agent are mixed and injected through the injection device. ; And after confirming the level of the ground by the expansion of the ground reinforcement and repair agent, removing the injection hose from the injection pipe, and sealing the perforation to finish the 4 step; can do.

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

The ground reinforcing repair agent in step 3 is a two-component type, comprising: a first liquid containing a polyether polyol mixture including a high molecular weight polyether polyol and a low molecular weight polyether polyol; and a second liquid containing diisocyanate; the first liquid is supplied to the injection device from the first liquid storage tank, and the second liquid is supplied to the injection device from the second liquid storage tank, and the injection device (injection) gun), it moves to the injection pipe through the injection hose at the same time, and is injected into the void (or gap) of the ground to be reinforced where the injection pipe is installed. After the first liquid and the second liquid are mixed, foaming proceeds within a short time, and the submerged ground rises while foaming. It is possible to adjust the injection amount of the ground reinforcing agent (1st solution and 2nd solution). And, at this time, the injection pressure is preferably sequentially injected at a pressure of 900 ~ 1500 psi, preferably 900 ~ 1200 psi, more preferably 920 ~ 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. It is preferable in terms of mechanical properties of

Specific description of the two-component urethane-based ground reinforcing agent, the polyether polyol mixture among the first component components contains a high molecular weight polyether polyol and a low molecular weight polyether polyol in a weight ratio of 1: 3.0 to 6.0, preferably 1: It may be included in a weight ratio of 4.0 to 5.5, more preferably 1: 4.5 to 5.2 by weight. At this time, if the amount of low molecular weight polyether polyol used is less than 3.0 weight ratio, the foaming power of the ground reinforcing agent may be insufficient. good to do

In addition, the viscosity of the first solution is 180 ~ 250 cps (25 ℃), and the viscosity of the second solution is 200 ~ 250 cps (25 ℃) is preferable in terms of mixability and workability.

In addition, the high molecular weight polyether polyol and low molecular weight polyether polyol among the components of the first solution 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 following range are used In this case, there may be a problem in that the proper foaming power cannot be expressed, the ground reinforcing agent is cured too quickly, or the workability (workability) is deteriorated because the curing time is delayed.

[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 solution may include the low molecular weight polyether polyol, the high molecular weight polyether polyol, a polyester polyol having 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 have.

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

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

Among the components of the first solution, the polyester polyol serves to increase 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, and preferably a functional group of 1.5 to 2.0 and a hydroxyl group of 300 to 350 mg. KOH/g. As an example of the polyester polyol, the trade names of Aekyung Petrochemical Co., Ltd. POL-1001, POL-1002, POL-1004, POL-1005, POL-3001, etc. may be used.

And, the amount of the 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 of the total weight% of the first solution, at this time, If the content is less than 5% by weight, there may be a problem of insufficient strength due to insufficient hydrophobic effect.

The moisture reaction inhibitor in the first liquid component serves to prevent the expanded and hardened foam from being deformed by moisture in the ground, and includes at least one vegetable oil selected from castor oil, soybean oil and corn oil. and preferably at least one selected from castor oil and soybean oil,

More preferably, it may contain castor oil. The amount of the water 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 of the total weight% of the first solution, and its usage is 8% by weight If it is less than %, the moisture resistance of the expanded and cured foam is not good, and deformation occurs in moisture, water, etc. for a long period of time, and the lifespan may be shortened. It may shrink, so it is recommended to use it within the above range.

Among the components of the first solution, the crosslinking agent may be a general crosslinking agent used in the art as a chain extender, preferably ethylene glycol, triethanolamine, 1,3-propanediol, 1,2-butanediol, 1,4-butanediol , 2-ethyl-1,3-hexanediol, 2-methyl-1,3-propanediol, and 1,6-cyclohexanediol may include at least one selected from, more preferably ethylene glycol, triethanolamine , at least one selected from 1,3-propanediol and 1,4-butanediol may be used. In this case, 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 of the total weight% of the first solution, and in this case, the amount of the crosslinking agent used 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) decreases, and there may be a problem that the curing time of the foam is delayed, so it is recommended to use it within the above range.

Among the components of the first solution, the foam stabilizer serves to maintain the uniformity and shape of the foamed cells, and general foam stabilizers used in the art may be used, preferably silicone, silicone glycol copolymer ( It is better to use a silicone-based foam stabilizer such as silicon glycol copolymer or polysiloxane ether. For example, Evonik's trade names B-8402, B-8870, B-8006, or Union Carbicle's trade names L-520, L-540, L-5340, L-5420, or Dow Corning's trade names DC-5604, DC-192, DC-193, DC-194, DC-195, etc. can be used. The amount of the antifoaming agent used may include 2 to 5% by weight, preferably 2 to 4% by weight, more preferably 2.2 to 3.5% by weight of the total weight% of the first solution, and the amount of the foam stabilizer used is 2 If it is less than the weight %, the cell uniformity formed by foaming may be deteriorated, and the physical properties of the foam may not be uniform. There may be a problem with decreasing.

Among the components of the first solution, the catalyst serves to promote the urethane reaction and curing at room temperature, and may include at least one selected from a tertiary amine-based catalyst and an organometallic catalyst, preferably a tertiary amine-based catalyst. A catalyst and an organometallic catalyst may be mixed and used, and more preferably, a tertiary amine-based catalyst and an organometallic catalyst are mixed in 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, more preferably 1.5 to 2.2% by weight of the total weight% of the first liquid, and the amount of the catalyst used is 1.5 If it is less than the weight %, there may be a problem that the foaming rate of the ground reinforcing agent is slow and/or the curing time is too delayed. It is recommended to use within the above range because the ground reinforcing agent, which expands and foams into a furnace, is hardened before it is injected and may have a problem with poor workability.

Examples of the tertiary amine catalyst include trialkylamines such as triethylamine, triethyldiamine, and ethylenediamine, 4-dimethylaminopyridine, benzyldimethylamine, 2,4,6-tris(dimethylaminomethyl)phenol, 1, A compound such as 8-diazabicyclo (5,4,0)-undecene may be used alone or in combination.

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

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

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

The flame retardant is tris (2-chloropropyl) phosphate (Tris (2-chloropropyl) phosphate, TCPP), tris (2-chloroethyl) phosphate (Tris (2-chloroethyl) phosphate (TCEP), chlorinated paraffins) halogen-based flame retardants such as; Alternatively, a phosphorus-based flame retardant such as triethyl phosphate may be used. And, the amount of the flame retardant used is 10 to 17% by weight, preferably 10 to 15.0% by weight, more preferably 12.0 to 15.0% by weight of the total weight of the first solution, and in this case, the amount of the flame retardant used is less than 10% by weight On the other hand, the flame retardant effect may be insignificant, and if used in excess of 17 wt%, it adversely affects the foaming power and can rather lower the compressive strength of the foamed ground reinforcement material, so it is recommended to use it within the above range.

And, 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, as a curing component, a fluidizing agent and diisocyanate, 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. isocyanates.

The fluidizing agent is used to increase the flowability and hydrophobicity of the delayed reinforcing agent in which the first and second solutions are mixed, and epoxydized soybean oil (ESO), polycarbonate It may include at least one selected from an acid-based (PC) surfactant and a polymelamine sulfonate sodium condensate-based (PMS) surfactant. At this time, if the amount of the fluidizing agent used is less than 3% by weight of the total weight of the second liquid, the amount used is too small and the effect of using it may be insignificant. Therefore, it is recommended to use it within the above range.

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

And, the MDI may have an NCO content of 30 to 32% by weight, 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 1.22 to 1.25, a boiling point of 205 to 210°C. , a flash point of 177 to 218 °C, and a viscosity of 150 to 250 cps (25 °C) may be used.

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

And, the polymeric MDI may have an NCO content of 25 to 35 wt%, preferably an NCO content of 27.5 to 34 wt%, and more preferably an NCO content of 30.0 to 32.5 wt%. In addition, 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 use of the two-component ground repair and reinforcing agent used in the ground reinforcement and repair construction method through the UPC method of the present invention is ground reinforcement, the expansion ratio is preferably 12 to 15 times, and the use of the two-component type ground repair reinforcing agent is used for reinforcement and ground raising In this case, the expansion ratio is preferably about 20 to 25 times.

The specific gravity of the foam foamed with the two-component ground repair reinforcing agent varies depending on the expansion ratio, and when the expansion ratio is 10 to 15 times, the specific gravity of the foam is about 60 to 90 kg/m ³ , and when the expansion ratio is 20 to 25 times, the foam The specific gravity is about 40 to 50 kg/m ³ .

In addition, after mixing the first and second liquids, the foaming start (CT cream time) is about 10 to 20 seconds, preferably 10 to 15 seconds at 20°C, and has an appropriate foaming time, and the complete curing time is for the first and second liquids. After mixing, at 20°C within 45 seconds, preferably within 40 seconds, more preferably at 20°C within 30 to 35 seconds.

The compressive strength of the foam formed by fully 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 days when the expansion ratio is 12 to 15 times can

The UPC construction method of the ground of the present invention is to fill the gap of the ground by infiltrating the eco-friendly two-component urethane-based ground reinforcing repair agent of the present invention into the gap of the ground lacking in bearing capacity, while strengthening the bearing capacity of the ground and increasing the shear force at the same time. It is a construction method (see FIGS. 1 and 2).

The UPC construction method of the ground using the two-component ground repair reinforcing agent of the present invention described above is not only the site of damage caused by ground subsidence of roads, sidewalks, runways, train tracks, buildings, etc. It is possible to reinforce and repair the ground within a short period of time for the damaged part of the ground, and it is possible to construct an eco-friendly environment without causing pollution of the surrounding environment.

Hereinafter, the present invention will be described in more detail through examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.

[Example]

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

(1) Preparation of the first solution

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

_A high molecular weight polyether polyol (manufacturer: N Chemicals) was prepared.

In addition, a polyester polyol having 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 (manufacturer: Aekyung Petrochemical Co., Ltd., trade name: POL-1001) was prepared.

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

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

The organometallic catalyst is an organic tin catalyst and is dibuchiltin diaurate (DBTDL).

The prepared first solution has a viscosity of 200 to 230 cps (25° C.) and a specific gravity of 1.03 to 1.07.

(2) Preparation of the second liquid

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

Then, 3.2 wt% of epoxidized soybean oil (ESO) and 96.8 wt% of MDI were mixed as a fluidizing agent to prepare a second solution.

The prepared second solution had a viscosity of 200 to 240 cps (25° C.).

Example 2

Prepare a first solution and a second solution with the same composition and composition ratio as in Example 1, but when preparing the first solution, a weight average molecular weight of about A low molecular weight polyether polyol of 510 to 550 (median 530) was used.

Example 3

Prepare a first solution and a second solution with the same composition and composition ratio as in Example 1, but when preparing the first solution, a weight average molecular weight of about A low molecular weight polyether polyol of 220 to 260 (median 240) was used.

Comparative Example 1

Prepare a first solution and a second solution with the same composition and composition ratio as in Example 1, but when preparing the first solution, a weight average molecular weight of about A low molecular weight polyether polyol of 620 to 640 (median 630) was used.

Comparative Example 2

Prepare a first solution and a second solution with the same composition and composition ratio as in Example 1, but when preparing the first solution, a weight average molecular weight of about A low molecular weight polyether polyol of 150 to 190 (median 170) was used.

Examples 4 to 6 and Comparative Examples 3 to 6

Examples 4 to 6 and Comparative Examples 3 to 6 were prepared by preparing a first liquid and a second liquid with the same composition and composition ratio as in Example 1, but by changing the composition ratio to prepare a first liquid as shown in Table 1 below. 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 antifoaming agent 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 Mixtures ⁽¹⁾ Remaining balance 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 Examples, it was calculated as the median value 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 antifoaming agent 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 Mixtures ⁽¹⁾ Remaining balance 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 solution and the second solution prepared in Examples 1 to 6 and Comparative Examples 1 to 6 were stirred for 7 seconds with a stirrer (stirring speed 1,50000 rpm) at a weight ratio of 1: 1.08, and then the reaction start time (CT) ) and the expansion ratio (or expansion ratio) of the ground reinforcing agent to measure the expansion ratio, foaming start time and complete curing time under the condition of an external temperature of 20 ° C. The results are shown in Table 3 below.

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

[Equation 1]

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

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

division expansion ratio
(20℃) firing
start time
(CT, 20℃) full cure time
(TFT, 20℃) compressive strength
(N/cm ² ) 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, in the case of Examples 1 to 6, the foaming ratio is 15 times or more, showing an overall excellent foaming power, and an appropriate foaming start time in the range of 10 to 20 seconds and within 50 seconds, preferably In most cases, it showed a very good compressive strength measurement result of 30 ~ 90 N/cm ² while having a complete curing time of less than 45 seconds.

On the other hand, with respect to the weight average molecular weight of the high molecular weight polyether polyol and the low molecular weight polyether polyol used, in the case of Comparative Example 1, the value of Equation 1 was 0.420 exceeding 0.400, when compared with Examples 1 and 2 , the compressive strength is high, but the foaming ratio is low, the foaming start time is too fast, and the complete curing time is unstable, which may cause a problem of rather lowering the workability during UPC construction.

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

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

And, in the case of Comparative Example 4 using a high molecular weight polyether polyol and a low molecular weight polyether polyol in a weight ratio of 1:2.64, which is less than 1:3.0 by weight, compared with Examples 1 and 5, the expansion ratio is very high, but the compressive strength There was a problem of greatly lowering.

And, in the case of Comparative Example 5 in which the foaming agent was used in an amount of less than 2.0 wt%, there was a problem in that the foaming power was rapidly reduced, compared with Example 6, and in the case of Comparative Example 6 in which the foaming agent was used in excess of 5.0 wt%, conduct Compared with Example 1, there was a problem that the complete curing time was too long and the compressive strength was too low.

Preparation Example 1: UPC method construction for submerged ground

Using the eco-friendly two-component urethane-based ground reinforcing agent (liquid 1 and 2) prepared in Example 1, the ground reinforcing agent is injected into the submerged ground as shown in FIG. 2 through the injection device and subsides through the UPC method Reinforcement and repair of the old ground was performed.

More specifically, the ground to be reinforced was first identified. Next, after drilling 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 respectively connected to the second liquid storage tank and the hydraulic compressor.

And, after installing the laser leveler, the first liquid (viscosity at 25 ° C = 190 ~ 220 cps), and the second liquid (at 25 ° C) of the two-component urethane-based ground reinforcing agent through the injection device using the injection device of viscosity = 200 ~ 220 cps) was mixed and injected.

At this time, the injection pressure was sequentially low-pressure injection of about 1000 ~ 1050 psi, and the mixing ratio of the first solution and the second solution was 1:1.08 by weight.

The mixing ratio of the first liquid and the second liquid is 1: 0.95 to 1.2 by volume, preferably 1: 0.98 to 1.15 by volume, and more preferably 1:1 to 1.10 by volume. It is preferable in terms of mechanical properties of

When the injection is complete, after checking the level of the ground due to the expansion of the ground reinforcing agent, the injection hose is removed from the injection pipe, the perforation is sealed and finished, and the UPC construction is completed (see FIG. 3 ).

Claims (8)

A first liquid comprising a polyether polyol mixture containing a high molecular weight polyether polyol and a low molecular weight polyether polyol satisfying Equation 1 in a weight ratio of 1: 3 to 6; and
An eco-friendly two-component urethane-based ground reinforcing repair agent for UPC (Urethane power consolidation) construction, comprising a second liquid containing diisocyanate.
[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.
According to claim 1, wherein the first liquid is polyester polyol 4 to 10% by weight, moisture reaction inhibitor 8 to 10% by weight, crosslinking agent 5 to 8% by weight, foam stabilizer 2 to 5% by weight, catalyst 1.5 to 3.0% by weight , 2 to 10% by weight of a foaming agent, 10 to 17% by weight of a flame retardant, and an eco-friendly two-component urethane-based ground reinforcement and repair agent for UPC construction, characterized in that it contains a mixed polyether polyol of the remaining amount.
According to claim 1, wherein the second liquid is an eco-friendly two-component urethane-based ground reinforcement and repair agent for UPC construction, characterized in that it contains 3 to 7% by weight of the fluidizing agent and the remaining amount of diisocyanate.
According to claim 1, wherein the low molecular weight polyether polyol comprises polyoxy (C ₂ ~ C ₃ alkylene) glycol,
The high molecular weight polyether polyol includes a polyoxyalkylene triol having a hydroxyl group of 50 to 150 mg KOH/g and a functional group of 2 to 3,
The polyester polyol is an eco-friendly two-component urethane-based ground reinforcing agent for UPC construction, characterized in that it comprises a polyester polyol having a functional group of 1.5 to 2.5 and a hydroxyl group of 300 to 400 mg KOH/g.
3. 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 , containing at least one selected from 3-propanediol and 1,6-cyclohexanediol,
The catalyst is an eco-friendly two-component urethane-based ground reinforcement and repair agent for UPC construction, characterized in that it comprises at least one selected from a tertiary amine-based catalyst and an organometallic catalyst.
According to claim 3, wherein the diisocyanate comprises at least one selected from diphenylmethane diisocyanate (MDI), modified MDI, polymeric MDI and toluene diisocyanate (TDI),
The fluidizing agent comprises at least one selected from epoxydized soybean oil (ESO), polycarboxylic acid (PC) surfactant, and polymelamine sulfonate sodium condensate (PMS) surfactant An eco-friendly two-component urethane-based ground reinforcement and repair agent for UPC construction.
As a construction method for reinforcing and repairing the ground,
The UPC construction method of the ground using the two-component urethane-based ground reinforcing repair agent of any one of claims 1 to 6.
8. The method of claim 7,
Step 1 to check the ground to be reinforced;
After drilling the confirmed reinforcement target ground, the second step of inserting the injection pipe into the drilling;
1st liquid storage tank. After connecting the injection hose and the injection pipe of the injection device connected to the second liquid storage tank and the hydraulic compressor, the first liquid and the second liquid of the two-component urethane-based ground reinforcing agent are mixed and injected through the injection device. ; and
After confirming the level of the ground by the expansion of the ground reinforcing agent, the 4 step of removing the injection hose from the injection pipe and sealing the perforation to finish the UPC construction method of the ground, comprising: a.

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