KR100798019B1 - Synthesis grouting method for supplementing the ground and stagnant water - Google Patents

Abstract

A complex grouting method for ground reinforcement and water barrier performance is provided to increase the strength and durability of a ground injection material by mixing A-type slurry functioning as accelerator and B-type slurry functioning as retarder in the optimum ratio and injecting evenly to the ground. A complex grouting method for ground reinforcement and water barrier performance comprises the steps of: perforating the ground to the planned depth using a perforating machine or a hand drill, and manufacturing A-type slurry functioning as accelerator and B-type slurry functioning as retarder using a stirrer; and inserting injection equipment and an injection pipe connected with the stirrer into a perforated hole, injecting the A-type slurry and the B-type slurry under low pressure through the injection pipe, and then ascending and pulling up the injection pipe, wherein an injection pipeline of the injection pipe is formed to discharge the A-type slurry and the B-type slurry at the mixed state by forming a first pipeline(11) injected with the A-type slurry and a second pipeline(12) injected with the B-type slurry individually and putting the first pipeline into the second pipeline, and the A-type slurry is manufactured by mixing inorganic powder, which is composed of 50~65 weight percent CSA(Calcium Sulfoaluminate) clinker, 30~45 weight percent C12A7(lime-alumina compound), 4~8 weight percent CaCl2(calcium chloride) and 0.5~1 weight percent poly-carbon acid based super-plasticizer with water in the volume fraction of 33 to 67, and the B-type slurry is manufactured by mixing a compound formed by mixing inorganic powder, which is composed of 90~95 weight percent anhydrous gypsum, 1~3 weight percent Li(OH2), 2~5 weight percent hydration and 0.2~2 weight percent poly-carbon acid based super-plasticizer and cement in the weight ratio of 38 to 90, with water in the volume fraction of 29 to 81.

Description

Synthesis grouting method for supplementing the ground and stagnant water}

The present invention is to stabilize the ground by performing grouting for cracks and pupils formed in the tunnel rock while excavating the rock to form a tunnel or to strengthen the bearing capacity of the soft ground during river embankment or subway construction The present invention relates to a method for preventing ground subsidence by grouting or grouting into the submerged pupil of a breakwater or seawall.

In general, the conventional grouting method is a method of injecting grout into the gap of soil or rock using an injection pump, etc., by installing an injection pipe in the ground and spraying the grout through the injection pipe of the ground by the injection material such as grout The method of increasing the bearing strength of the target ground, reducing the permeability coefficient, improving the water-repellency, reducing the compressibility, reducing the noise and vibration generated during construction, and enabling the construction of low vibration and low noise, and shortening the air to be. The grouting method is widely used in various applications such as ground reinforcement and order, foundation pile formation, soft ground improvement, structure reinforcement, tunnel reinforcement and order.

In the existing grouting method, water glass (sodium silicate) has been mostly used as a fastener to solidify the ground. Water glass-based ground injection material has the advantage of being able to freely control the gel time (initial curing time) according to the amount of use and can be applied to both solution type and suspension.However, the water glass is strongly alkaline and dissolves over time. It can be used as a temporary facility due to severe contraction and deterioration of strength expression due to age, but there are limitations on semi-permanent order and ground reinforcement. In particular, alternative materials are urgently needed due to environmental pollution of heavy metals by elution water.

In order to solve the problem of the existing water glass-based ground injection materials, related industries are seeking ways in various directions, such as the development of special soda silicate with low dissolution and the development of inorganic injection materials as organic injection materials and semi-permanent order and reinforcement materials. .

In addition, specific types of the conventional grouting method include the LW method and the SGR method.

The LW method, which is a representative ground reinforcement injection method commonly used in the conventional 1.5shot method, is a method of penetrating into the ground a special injection material for improving the soil characteristics to meet the purpose of use. In the above method, after inserting the man-jet tube with rubber sleeve, the gravity injection seal material is injected between the man-jet tube and the casing, the casing is drawn out, and an injection tube equipped with two packers at the top and bottom is placed in the man-tube tube. Inject from the desired position. At this time, the injection material pushes the rubber sleeve through the injection hole of the mandrel tube, destroys the seal material, and penetrates into the ground. The LW method is mainly penetrated into the gravel layer and the sand layer, and is injected into the liquid phase in the soft viscous soil and the silt layer, so that it is effective in preventing settlement and strengthening the ground, but it is difficult to inject it in the fine yarn layer below 0.6mm.

SGR (Space Grout Rocket System) method, which is a typical injection method of 2.0shot method, combines a special tip device with a double pipe rod to form an induction space on the target ground, and water glass-based liquid and cement with gel time close to purity. As a method of improving the soft ground by using the mixed solution, the main injection materials are sodium silicate, fastener and cement. The main construction equipment is boring machine, mixing plant and injection plant. In this SGR method, the grout discharged from the special tip device (Rocket) is uniformly injected in all directions of the target ground through the guide space (Space). In addition, the SGR method is easy to use a continuous composite injection of fastening and final injection material by using a three tank type agitator, generally available for both viscous and sandy soils. However, in this SGR method, the water glass-based injection material reacts with the cement by the gluing effect of the water glass itself to form a gel, and the water glass is coated with the cement particles, which prevents the hydration reaction of the cement in the long term, lowers the strength, and As time goes by, the water glass cured body gradually dissolves in water, reducing the volume of the injection material, which eventually causes the injection material to dissolve and breaks the linkage that forms the gel, thereby lowering the durability due to the compressive strength and the disadvantage of the material. There is a problem that can not be applied.

In addition, as described above, the grouting methods use different injection materials and injection pipes according to the respective methods, and there are limitations on the ground conditions to which they can be applied. When several constructions are carried out in parallel, the processes performed by each part should be prepared and installed separately for each injection pipe and injection material, and accordingly, injection equipment and agitation device should be installed separately, which makes the process cumbersome and delays. This becomes unavoidable and requires a lot of manpower and time, which is uneconomical and poor in construction.

In addition, the existing methods are limited to the injection material used in the quickening solution and the complete solution is not easy to control the gel time, and it is difficult to use a suitable injection material according to the construction purpose and ground conditions, there was a limitation in construction.

On the other hand, Patent No. 0671934 is an invention that solves the problems of the existing methods described above is an injection pipe in which the valve nozzle is formed of the ground injection material selected according to the construction purpose and construction conditions of the inorganic injection material, chemical liquid injection material and high-strength injection material By injecting the compound into the ground through low pressure injection, it can be applied to all grounds with a single injection pipe, and the injection effect is improved due to the valve nozzle of the injection pipe during injection, and the loss and backflow of the ground injection material is prevented. There are no limitations on the use of ground injection materials by forming and using all kinds of ground injection materials (inorganic, chemical, and high strength injection materials) as easy quickening solution, stopping liquid, finishing liquid, cement milk and mineral milk. It is applicable to the ground, and the ground injection material and injection method are selected and constructed according to the purpose of construction and the ground situation. It is evaluated by a grouting method with a high degree of order effect and high workability and economic efficiency.

The present invention is to further improve the '06 integrated grouting method for ground reinforcement and order '.

Patent No. 0671934 simultaneously injects a primary injection material consisting of a quickening solution and a stopper liquid, and a secondary injection material selected from any one of a mineral liquid, a mineral liquid, a cement liquid, and a cement milk, or time intervals. In this case, the primary injection material and the secondary injection material are injected into the ground through a single pipe, and the grout material is solidified in the injection pipe, causing the injection pipe to be clogged. Dividing the pipeline of the injection material causes a problem that the first and second injection materials are separated without being sufficiently mixed.

Therefore, the present invention improves the structure of the injection pipe so that there is no fear of clogging the injection pipe due to the grout material while mixing the fastener and the cement injected separately, and on the other hand, by adjusting the constituents and the mixing ratio of the ground injection material, The purpose is to improve the strength and durability of the.

One. Of injection tube  Restructuring

The injection pipe line of the ground injection material is divided into a first pipe into which the A-type slurry is injected and a second pipe into which the B-type slurry is injected, and the first pipe is introduced into the second pipe and consequently, the A-type slurry and the B-type slurry are It is configured to be injected into the ground in a mixed state.

By separating and injecting the A type slurry and the B type slurry, the ground injection material is prevented from solidifying in the pipeline, but when the ground injection material is discharged to the ground, the A type slurry and the B type slurry are discharged in a mixed state. The performance (fastness) of the injection material is sufficiently exhibited.

2. Control of component and mix ratio of ground injection material

Type A slurry is formulated to have the function of quenching cement, type B slurry is formulated to delay the hardening of cement milk, and gelation does not occur when A type slurry and B type slurry are injected into separate pipes and moved. Do not However, in order to control the gel time in the state where the A-type slurry and the B-type slurry are mixed, and to secure the compressive strength after the hardening of the ground injection material proceeds, the ground injection material is inorganic, and the constituents and the mixing ratio of the inorganic injection material are controlled. To achieve the required performance.

According to the present invention, the problem of clogging the injection pipe by the ground injection material and the type A slurry and B in the ground when separating and injecting the fastener (type A slurry) and the cement milk (type B slurry) added with a specific additive material All the problems that the type slurry is not evenly mixed can be solved, and the A type slurry and the B type slurry can be mixed with the inorganic type material to effectively control the gel time, strengthen the compressive strength, and prevent environmental pollution.

The present invention comprises the steps of (a) perforating the ground to the planned depth, and preparing a type A slurry to serve as a fastener and a type B slurry to serve as a complete agent with a stirring device; And (b) inserting an injection device and an injection tube connected to the stirring device into a drilling hole, and low-pressure injection of A-type slurry and B-type slurry through the injection tube according to gel time, and drawing up the injection tube. The A-type slurry is composed of 50 to 65% by weight of CSA clinker, 30 to 45% by weight of C ₁₂ A ₇ , 4 to 8% by weight of CaCl ₂ , and 0.5 to 1% by weight of polycarboxylic acid-based fluidizing agent. System powder and water are mixed in a volume ratio of 33:67, and the type B slurry is 90 to 95% by weight of anhydrous gypsum, 1 to 3% by weight of Li (OH) ₂ , 2 to 5% of calcined lime, and a polycarboxylic acid-based fluidization The water-based powder blended with 0.2 to 2% by weight of the mixture and the cement is a mixture of water and a mixture of 29:81 by weight ratio of 38:90, the injection tube is a first injection type A slurry Ground reinforcement, characterized in that the first pipe is introduced into the second pipe line and discharged in a mixed state of the A-type slurry and the B-type slurry on a predetermined line followed by separating the second pipeline into which the B-type slurry is injected. And a complex grouting method for ordering.

1A to 1C are cross-sectional views briefly showing the construction process of the ground reinforcement and order composite grouting method according to the present invention.

In order to implement the present invention, first install a stirring device, an injection device, and a plant in a construction site. At this time, the stirring device is selected from 2 breakfasts, 3 breakfasts, 4 breakfasts and 2 & 4 breakfasts to suit the construction situation and purpose.

The construction ground 1 is drilled to the planned depth by using the punching machine 2 or the hand drill shown in FIG. 1A. At this time, it is possible to select the type of ground injection material suitable for the construction site by carrying out the test construction.In the present invention, the inorganic powder including cement and the inorganic powder including cement and water, and the cement and the cement, Form B slurry in which water is blended.

As shown in FIG. 1B, the injection tube 10 is injected into a boring hole in the ground. Thereafter, the A-type slurry and the B-type slurry are injected through the injection pipe 10 in a low pressure injection method, and the injection pipe 10 is pulled up as shown in FIG. 1C. In this case, the injection material may be injected through various injection pipes as shown in FIGS. 2A to 2D according to construction conditions.

The injection pipe line of the injection pipe 10 shown in FIG. 2A is connected to the first pipe line 11 into which the A-type slurry is injected and the second pipe line 12 into which the B-type slurry is injected, followed by a first pipe line on a predetermined line. (11) is inserted into the second conduit 12 and configured to be discharged in a state in which the A-type slurry and the B-type slurry are mixed.

The injection pipe line of the injection pipe 10 shown in Figure 2b is connected to the branch pipe (11a, 12a) to the first pipe line 11 and the second pipe line 12, respectively, the branch pipe (11a) of the first pipe line is It penetrates into the branch pipe 12a of a 2nd pipe | channel, and is comprised so that A type | mold slurry and a B type slurry may be discharged in mixed state.
The injection pipe line of the injection pipe shown in FIG. 2C is connected to two second pipe lines 12 separately arranged on both sides of the first pipe line 11, and merged into one on a predetermined line, and the first pipe line 11 is divided into two pipe lines. The two pipes 12 are introduced into the merged portion and are configured to discharge the A-type slurry and the B-type slurry in a mixed state.
The injection pipe line of the injection pipe shown in FIG. 2d is connected to the first pipe line 11 and the two second pipe lines 12, respectively, the branch pipes 11a and 12a, the branch pipe (11a) of the first pipe line Penetrated into the branch pipe (12a) of the two pipe is configured to be discharged in a mixed state of the A type slurry and B type slurry.
In other words, the two second conduits 12 are separated and arranged on both sides of the first conduit 11, and then merged into one on a predetermined line, and the branch conduits 12a are merged into one of the second conduits 12. The branch pipe 11a is also connected to the first pipe line 11 connected to the second pipe line 12 merged into one, so that the branch pipe 11a of the first pipe line 11 is connected to the second pipe line ( It can be embodied in the embodiment configured to penetrate into the branch pipe (12a) of 12).

Meanwhile, the injection tube may be configured as shown in FIG. 2E to mix and discharge other additives such as sand and gravel into the B-type slurry, and as shown in FIG. 2F, a mixture of the A and B type slurry. The injection pipe can be configured to be discharged only in the lateral direction, such that the design of the injection pipe can be changed according to the ground situation or the purpose of construction.

As above, the injection pipe line is divided into the A type slurry and the B type slurry, and the A type slurry is configured to discharge the B type slurry together. As soon as the ground injection material is injected into the ground without gelling in the pipe, It is intended to be fastened. That is, the fastener included in the A-type slurry is to cure the cement contained in the B-type slurry, so in the step of injecting into the injection tube, the A-type slurry and the B-type slurry are injected into different pipelines so that the pipeline is not blocked. In the step of injecting the injection material into the ground is discharged in a mixed state of the A-type slurry and B-type slurry to be quickly quenched in the ground.

On the other hand, both the A type slurry and the B type slurry used as the ground injection material in the ground reinforcement and order composite grouting method of the present invention is a kind of inorganic type injection material.

Inorganic fillers are freely controlled from seconds to minutes by controlling the volume ratio of water by using plastic compounds composed mainly of lime, gypsum, and bauxite, instead of water glass used for gel formation in conventional ground reinforcement grouting methods. I would have to. Inorganic fillers are accelerated by rapid hydration of calcium aluminate minerals, and produce ethrinzide hydrates during curing to compensate for cracking by promoting early strength development and compensating for dry shrinkage after curing. In addition, it plays a role of immobilizing hexavalent chromium, which is an environmental problem in recent years, preventing elution of hexavalent chromium, and the structure of the cured body becomes dense and strength increases with time due to the characteristics of the inorganic system. These inorganic fillers can be selectively used in various volume ratios of water, and the lower the volume ratio of water, the faster the gel time and the higher the volume ratio of water, the slower the gel time. The material can be adjusted as desired.

When explaining the specific characteristics of the inorganic injection material compared with the water glass injection material as follows.

1) Prevention of dissolution

The major drawback of the water glass-based (sodium silicate) filler is that free CaO is adsorbed and adsorbed on the gel pores and capillaries in the hydration product, but most of the free water is lost in water and evaporates in the air, resulting in capillary tension. Shrinkage and cracking occur. Inorganic fillers, however, produce acicular ethrinzide hydrates, which promote expansion in water and inhibit shrinkage in the air, so there is no leaching.

2) mechanism

Inorganic injection material has an excellent hardener structure, the overall structure is dense, forming an ideal hardener structure with little voids, and also has excellent characteristics in order performance, durability and strength properties.

A large amount of ethrinzite (needle crystals) is formed to exhibit initial quenching and roughness, and long-term strength is expressed by the hydration reaction of cement. On the other hand, in the case of water glass-based injection material, it forms a very loose structure, the pore size is very large and the porosity is high, and the cemented water glass produced by the glueing effect is not seen in cement particles or hydrated minerals. Appears to be covered in. Therefore, most of the gelled water glass remains in a state of being freed from hydrate formation, thereby inhibiting the hydration reaction of cement, thereby inhibiting the development of strength of the curing agent, and weakening the tissue by re-dissolving the gelled water glass upon contact with water. The dissolution phenomenon appears, which causes environmental pollution.

3) high durability

The water glass-based injection material is gelled by mixing a small amount of electrolyte. In particular, when alkaline substances such as calcium hydroxide or portland cement are added, the gel is formed by a paste effect in which SiO ₂ in the water glass reacts with CaO to rapidly produce amorphous CSH. Since it is not directly involved in the hydration reaction of cement, the cured product formed by the water glass-based injection material gradually dissolves in water as time passes and the volume decreases, and the linkage to form the gel is broken, resulting in the hardening of the hardened product. It envelops the particles, which hinders the hydration reaction, making it difficult to expect strength enhancement in the long term.

On the other hand, inorganic fillers are cement minerals, when Ca (OH) ₂ and CaSO ₄ coexist with portland cement, a large amount of C ₃ A · 3CaSO ₄ · 32H ₂ O (ethrinzite) needle crystals are produced It reacts in a few minutes to form a dense structure, thereby reducing voids and increasing water tightness, and in the long term, the hardened structure is densified by the hydrate produced by cement hydration, so that it does not dissolve in water and exhibits endurable durability.

4) high intensity expression

The water glass-based injection material has a long effect on the strength of the glass because the water glass itself forms a gel and covers the cement particles to prevent cement hydration in the long term.

Inorganic fillers, however, are produced by a large amount of C ₃ A · 3CaSO ₄ · 32H ₂ O (ethrinzite) needle crystals, which have good initial strength and do not interfere with hydration of cement. The tissue becomes more densified and exhibits excellent long-term strength properties with increased strength.

5) resistance to seawater

Water glass-based injection material forms gel by the pool effect of reacting with Ca (OH) ₂ , which is a hydration product of cement, to form CSH gel. However, in the case of using sea water or in the presence of sea water, chloride such as NaCl and MgCl ₂ is Reacting first with Ca (OH) 2, which is a product of cement, forms CaCl ₂ , which interferes with the formation of CSH gels.

Inorganic fillers, however, are formed by the reaction of hardener (A type slurry) and cement (B type slurry) to form ethrinzite to form a gel. .

6) Environmental friendliness

Water glass-based injection material is a situation in which the use of water glass-based injection material is gradually reduced in construction sites because harmful components such as hexavalent chromium are eluted from the material contained in the cement-based component due to the dissolution phenomenon.

Inorganic-based injection material has no leaching phenomenon and is an environmentally friendly material because heavy metal components are immobilized on the hydrate through hydration reaction and heavy metals such as hexavalent chromium are not eluted.

7) Convenience of work

Inorganic injection materials can be used if the water temperature is 15 ℃ or higher, and the gel time can be arbitrarily controlled in a few seconds, making it a universal material that can be conveniently used according to the site conditions. It can also be used in three tank plants.

In the present invention, the type A slurry is a mixture of inorganic powder and water to play a role of a fastener, and the type B slurry is a mixture of inorganic powder and cement and water, which serves as a complete agent, the type A slurry is B It meets the cement contained in the mold slurry and performs its function.

The A-type slurry is composed of inorganic powder and water blended with 50 to 65% by weight of CSA clinker, 30 to 45% by weight of C ₁₂ A ₇ , 4 to 8% by weight of CaCl ₂ , and 0.5 to 1% by weight of polycarboxylic acid-based fluidizing agent. This is mixed in a volume ratio of 33:67 (ie, the volume ratio of water is 67% by volume).
The B-type slurry is a water-based powder and cement blended with 90 to 95% by weight of anhydrous gypsum, 1 to 3% by weight of Li (OH) ₂ , 2 to 5% of hydrated lime, and 0.2 to 2% by weight of a polycarboxylic acid-based fluidizing agent. A mixture of water at a weight ratio of 38:90 and water at a volume ratio of 29:81 (ie, the volume ratio of water is 81% by volume).

Material specifications of the inorganic powder of the A-type slurry and the B-type slurry are as follows.

1) CSA Clinker

Al ₂ O ₃ Ingredients must be at least 37%

-Powder should be more than 7000㎠ / g

2) CaCl ₂

-General industrial

3) C ₁₂ A ₇

Al ₂ O ₃ Ingredients must be at least 37%

-Powder should be more than 5000㎠ / g

4) anhydrous gypsum

-Powder should be more than 5000㎠ / g

5) Li (OH) ₂

-95% or more must pass # 100

6) slaked lime

-60% or more of CaO should be # 200

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Figure 4 shows the gel time, compressive strength, type B slurry viscosity, Na ₂ O ratio and the powder test results according to various mixing conditions. The inventor of the present invention maintains the volume ratio of the water contained in the A slurry to 67% by volume in order to derive the optimum mixing ratio of the A slurry and B slurry as described above, the inorganic powder of the A slurry is CSA clinker and CaCl _The weight ratio between the mixture of _{2 and} the mixture of C ₁₂ A ₇ and the polycarboxylic acid-based fluidizing agent is fixed at 95: 5, and the cement and inorganic materials are maintained at a volume ratio of 67% by volume of water contained in the type B slurry. By varying the weight ratio of the powder and the weight ratio of the inorganic powder constituent material, the gel time, compressive strength, viscosity of the type B slurry, the powder degree, etc. were measured. (Refer to the data of Experimental Examples 1 to 8)

Meanwhile, in FIG. 4, test results for Comparative Examples 1, 2, and 3 may also be understood. Comparative Example 1 is an SGR product, Comparative Example 2 is a micro cement-based product, and Comparative Example 3 is an inorganic fastener-based product. .

As can be seen in Figure 4, the experimental examples according to the compounding conditions presented in the present invention, since the viscosity of the B-type slurry is generally low, it seems that the fluidity in the injection pipe is high, the rapid gel time of Experimental Examples 1 to 8 It is showing a change.

Experimental results of Figure 4 reveals that the most favorable compressive strength is expressed in the mixing conditions of Experimental Example 4. That is, the above conditions were fixed, and the weight ratio of cement to inorganic powder in the B slurry was 90:38, and anhydrous gypsum, Li (OH) ₂ , slaked lime and polycarboxylic acid fluidizing agent constituting the inorganic powder were used. When the weight ratio of 94.5: 3: 2: 0.5 is blended, the initial compressive strength is slightly lower than that of Comparative Example 3, but the 28-day compressive strength is the highest as 45kgf / cm 2.

1A to 1C are cross-sectional views briefly showing the construction process of the ground reinforcement and order composite grouting method according to the present invention.

2a to 2f show various embodiments of the injection tube conduit configuration.

Figure 3 shows the weight ratio of the inorganic powder of the A slurry and B slurry.

Figure 4 shows the gel time, compressive strength, type B slurry viscosity, Na ₂ O ratio and the powder test results according to various mixing conditions.

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

1: Ground 2: Drilling Machine

10: injection pipe 11: the first pipe

11a: Branch line (1st line) 12: 2nd line

12a: branch pipe (second pipe) 13: check valve

Claims (5)

(a) perforating the ground to the planned depth, and preparing a type A slurry serving as a fastener and a type B slurry serving as a finalizer with a stirring device, respectively; And (b) inserting an injection device and an injection tube connected to the stirring device into a drilling hole, low-pressure injection of A-type slurry and B-type slurry through the injection tube, and drawing up the injection tube through the injection time; Consisting of, The A-type slurry is composed of inorganic powder and water blended with 50 to 65% by weight of CSA clinker, 30 to 45% by weight of C ₁₂ A ₇ , 4 to 8% by weight of CaCl ₂ , and 0.5 to 1% by weight of polycarboxylic acid-based fluidizing agent. In a 33:67 volume ratio The B-type slurry is a water-based powder and cement blended with 90 to 95% by weight of anhydrous gypsum, 1 to 3% by weight of Li (OH) ₂ , 2 to 5% of hydrated lime, and 0.2 to 2% by weight of a polycarboxylic acid-based fluidizing agent. Is a mixture of water in a weight ratio of 38:90 and water in a volume ratio of 29:81, The injection pipe is separated by a first pipe line into which the A-type slurry is injected and a second pipe into which the B-type slurry is injected, and then the first pipe is introduced into the second pipe on a predetermined line, and the A-type slurry and the B-type slurry are mixed. Ground grouting and reinforcement complex grouting method characterized in that configured to be discharged in a state. In claim 1, The injection pipe is a branch pipe is connected to each of the first pipe line and the second pipe line, the branch pipe of the first pipe line is inserted into the branch pipe of the second pipe line is configured to be discharged in a mixed state of the A-type slurry and B-type slurry Complex grouting method for ground reinforcement and degree characterized in that the. In claim 1, The injection pipe is divided into two second pipes on both sides of the first pipe line, and then the two second pipes are merged into one on a predetermined line, and the first pipe line is inserted into the second pipe merged into one A type. A ground grouting and ordering compound grouting method characterized in that the slurry and B-type slurry is configured to be discharged in a mixed state. In claim 3, Branch pipe is connected to the second pipe merged into one, Branch pipes are also connected to the first pipeline connected to the second pipeline merged into one, Ground reinforcement and order composite grouting method characterized in that the branch pipe of the first pipe line is configured to be introduced into the branch pipe of the second pipe line. delete

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