KR101633840B1 - The Earth Retaining Wall using the Hybrid-CIP(Cast-In place concrete Pile) method, and thereof Construction Method - Google Patents

Abstract

In the present embodiment, the gravel and recycled aggregate are installed in a steel pipe casing hole, the reinforcing net is inserted, and the first and second injection pipes for grouting are inserted through the grouting, Pressure grout material having a low water separation rate, high flowability, air retaining property, and environment friendliness after the primary grouting low pressure injection from the front end, the first injection pipe and the steel pipe casing are pulled out to form a grouting pillar, And a grouting secondary wall formed between the concrete column formed by the installed CIP and the adjacent grouting pillar by drawing the second injection pipe by injecting the Hi-FA grout material at the second grouting low pressure at the time of drawing the steel pipe casing .
Therefore, according to the present invention, a circular wall made of a concrete column and a circular wall made of a grouting pillar are connected to a casing filled with aggregate, crushed stone, recycled aggregate, and the like through first and second grouting on the characteristic of HI-FA grout, The present invention is advantageous in terms of air, construction cost, and stability since reinforcement and water wall are formed without additional car-receiving grout.
In addition, the present invention is very easy to use as a reinforced wall for a temporary installation (a wall for a soil plate and a wall for receiving a car) because the column strength is greatly improved due to the separation characteristics of water while maintaining a desired bulb and a wall.
In addition, according to the present invention, the size of the casing can be as small as 200 to 300 mm or more to 3,000 mm or more as desired, and in the case of the aggregate to be used in the interior, It is advantageous in strength development and there is an advantageous effect that there is no separate constraint on the aggregate size.
In addition, since grouting is performed from the tip of the present invention, only the disturbed soil and water in the pipe are excluded, so that the concrete is not harmful to the environment and exhibits excellent strength, and concrete slime is not generated, .

Description

Technical Field [0001] The present invention relates to a method of constructing an earth retaining wall using a H-CIP method and a method of constructing the earth retaining wall using the H-CIP method,

Field of the Invention [0002] The present invention relates to a civil engineering field, and more particularly, to a grooved wall structure using a H-CIP (Hybrid-CIP) method for retaining and draining water and a construction method thereof. And a method of constructing the reinforced and car-receiving wall structure (soil-retaining wall for earth plates), which does not require a separate method.

Generally, a cast-in place pile (CIP) method or an SCW (Soil Cement Wall) method is mainly used as a method of forming an earth retaining wall and a water receiving wall.

FIG. 1 is a plan view of a general CIP method. As shown in FIG. 1, a cast in place pile (CIP) method is a type of cast-in-place casting column method. A reinforcing member such as an H-shaped steel pile or a reinforcing steel assembly is inserted into the hole, the gravel is filled in the remaining portion, and a filler (e.g., cement, concrete) is installed to form an earth retaining wall.

However, in the case of the above CIP method, it is possible to construct the retaining structure even in a narrow working space, and it is advantageous in that the stiffness is larger than the sectional size. However, the column can not be kept vertical but tilted, It is necessary to take measures to reinforce the joints and to install the main thermal type earth retaining wall in case the ground bulb is not normally constructed when the soil condition is poor. LW grouting, SGR grouting, and cement grouting are required, which is time consuming and costly.

Patent Document 1: JP-A-10-1067707, Sep. 29, 2011, page 3, line 10 to line 12, drawing 1

The present invention aims at solving all the problems caused by reinforcement of joints between columns and a separate order method in the construction method using the conventional CIP method as described above.

In the present invention, an H-CIP (Hybrid-CIP) method is used in which a reinforcing wall (a retaining wall and a wall receiving wall) is constructed by laying gravel, recycled aggregate, and the like on a column for reinforcing bars and applying a grouting low- The present invention has been made to provide a temporary retention method using a construction method and a construction method thereof.

In addition, the H-CIP method according to the present invention requires a separate order method by forming a grouting wall by injecting Hi-FA (High Performance & Multi-Function Agent) grout materials from the front end to the first and second sides Therefore, it is an object of the present invention to provide a temporary retaining structure using a H-CIP method and a construction method thereof, which can reduce a construction cost as well as a construction period.

In addition, the present invention relates to a Hi-FA grout material having high viscous water separation, high flowability, air retaining property, and environment friendliness through a double inlet for grouting by installing gravel, recycled aggregate, Civil Works and H-CIP method, which is characterized by the fact that a separate piping method is not necessary by reinforcing the ground by connecting the concrete column and the grouting column by drawing the steel pipe for the casing after the second injection and forming the grouting wall. The purpose of the construction method is to provide.

The present invention is based on the finding that, when a column is not vertically maintained and is inclined, the columns are opened, the aggregate separation phenomenon occurs due to the flow rate of the ground water, or the column bulb is not normally installed It is an object of the present invention to provide a temporary retaining structure using a H-CIP method using a car-receiving wall for reinforcing a ground which can completely fill a gap by a grouting method using a Hi-FA grout material in a space.

In order to accomplish the above object, according to an embodiment of the present invention, a retaining structure using an H-CIP method is characterized in that after a steel pipe casing is perforated, a reinforcing net is inserted, first and second grouting pipes are installed, The aggregate is laid in a steel pipe casing hole, and Hi-FA grout material having high viscosity water separation, high flowability, air retaining property and environment friendliness is introduced from the tip through the first grouting low pressure After the injection, the first injection pipe and the steel pipe casing are pulled out to form a grouting column, the Hi-FA grout material is injected into the second injection pipe after the second grouting low pressure injection, and the concrete column and the The grouting vertical wall formed between the grouting pillars.

In order to accomplish the above object, according to an embodiment of the present invention, there is provided an earth retaining structure using a concrete column, wherein the concrete pillar is disposed as a prism, and the concrete pillar disposed between the prisms And a grouting vertical wall connecting the concrete column and the adjacent grouting pillar.

To accomplish the above object, there is provided a method for constructing a concrete pillar structure using an H-CIP method according to an embodiment of the present invention includes drilling a ground using a steel pipe casing in a ground, (Step 101); A step (102) of clogging the soil inside the steel pipe casing with auger or T-4 to close the H-file (reinforcing net or non-reinforcing net); (Step 103) of inserting concrete after inserting the H file; Forming a concrete column by a CIP method by pouring the steel pipe casing after installing the concrete (104); Drilling a ground by using a steel pipe casing in a grouting hole between the concrete column formed by the CIP method and the concrete column to form a grouting column (step 105); (Step 106) of cladding the soil inside the steel pipe casing excavated in step 105 with auger or T-4, and closing the reinforcing net inside the steel pipe casing; Installing the dual lumen inlet (first and second injection pipes) (step 107) after inserting the reinforcing net 16; (Step 108) of installing gravel for column formation and recycled aggregate under the inside of the steel pipe casing in a state in which the double inlet pipe (first and second inlet pipes) are installed with the reinforcing net 16; (Step 109) of forming a grouting pillar by injecting a Hi-FA grout material at a low pressure between the installed gravel and the recycled aggregate through the installed dual inlet (first and second injection pipes) installed at a low pressure; A step (110) of withdrawing the steel pipe casing and the first injection pipe while withdrawing the first pipe after the first grouting by low-pressure injection of the Hi-FA grout material; (Step 111) of injecting secondary grout into the Hi-FA grout material through the second injection pipe in the process of withdrawing the steel pipe casing and the first injection pipe while extracting the Hi-FA grout material, ; A second grouting of the Hi-FA grout material is performed on the ground disturbed when the steel pipe casing is pulled out, and a second grouting and grouting wall formed by the second grouting injection of the Hi-FA grout material, which is an additional reinforcement step, Drawing the tube (step 112); And further comprising:

As described above, the present invention uses the Hi-FA grout material according to the present invention in order to overcome the disadvantages of the prior art as described above, and thus has an effect of separating underwater fire, high fluidity, have.

The present invention is characterized in that, due to the characteristics of the Hi-FA grout material, a circular wall is connected to a casing filled with aggregate, crushed stone, and recycled aggregate through primary and secondary grouting to naturally form a car receiving wall. It is advantageous in terms of air, construction cost, and stability.

In addition, the present invention is very easy to use as a reinforced wall for a temporary installation (a wall for a soil plate and a wall for receiving a car) because the column strength is greatly improved due to the separation characteristics of water while maintaining a desired bulb and a wall.

In addition, according to the present invention, the size of the casing can be as small as 200 to 300 mm or more to 3,000 mm or more as desired, and in the case of the aggregate to be used in the interior, It is advantageous in strength development and there is an advantageous effect that there is no separate constraint on the aggregate size.

Furthermore, since the Hi-FA grout material is grouted from the front end, the present invention excludes disturbed soil and water only in the inside of the pipe, so that it is not harmful to the environment and exhibits excellent strength and does not generate concrete slime. There is an effect that can be prevented.

1 is a plan view of a construction structure according to a conventional CIP method.
2 is a plan view of the H-CIP construction according to the present invention.
FIG. 3 is a diagram illustrating the characteristics of separation of water from the Hi-FA grout material according to the present invention.
FIG. 4A is a view showing a hole holding characteristic of a conventional general cement grout material.
FIG. 4B is a graph showing a property of holding a hollow wall of a Hi-FA grout material according to the present invention.
Fig. 5 shows a permeability characteristic diagram of the Hi-FA grout material of the present invention.
6A to 6C show a flowchart of the H-CIP construction according to the present invention.
FIG. 7 is a view showing a hypothetical wall shape after final H-CIP construction according to the present invention. FIG.
8 shows an example of an embodiment according to the H-CIP with two holes spacing according to the present invention.
FIG. 9 shows an example of an embodiment according to the H-CIP of three balls spacing according to the present invention.

As shown in the plan view of the H-CIP construction structure according to the present invention shown in FIG. 2, the earth retaining structure according to the H-CIP (Hybrid-CIP) construction method of the present invention will now be described.

As shown in the figure, in order to form the temporary retaining structure, the concrete columns (I, III, V, VII) are sequentially placed in the order of I, III, V, VII, II, IV, The grouting pillar 50 is formed between the holes I and III of the concrete column and between the holes III and V of the concrete column, A grouting wall 60 is formed between the circular concrete pillar 20 and the grouting pillar 50 to form the earth retaining structure.

The concrete column 20 is formed by drilling the ground 10 using the steel pipe casing 22 at the positions of the CIP drilling holes 21 and the thumbnails I, III, V and VII, The steel pipe casing 22 is pulled out after placing the H file 23 (or any one of the reinforcing net or the non-reinforced concrete) and concrete, placing the concrete column 20 of the CIP method Construction.

Next, in order to form the grouting pillar 50, the CIP excavation hole 21 of the concrete column 20 formed by the CIP method is sandwiched between (I, III), (III, V) II, IV, VI and VIII, the grouting pillars 50 are formed,

That is, the steel pipe casing 52 is used to move the ground 10 between the concrete column 20 and the column 20, that is, the H-CIP grouting holes 51, II, IV, VI, And then soil the inside of the steel pipe casing 52 is augerated or T-4 so that the reinforcing net 54 is inserted. After inserting the reinforcing net 54, a double lumen inlet (first and second injection pipes 56 and 57) is installed. The first injection pipe 56 is installed at the center of the steel pipe casing 52 and the second injection pipe 57 is installed at both sides of the rim of the inserted reinforcing bar 16.

The gravel for column formation and the (recycled) aggregate material 34 are laid under the inside of the steel pipe casing 52 after the double-column inlet pipe (first and second injection pipes 56 and 57) are installed. A Hi-FA (High Performance & Multi-Function Agent) grout material 55 is inserted between the installed gravel and the aggregate 34 through the double inlet pipe (first and second injection pipes 56 and 57) And the grouting pillar 23 is formed by primary grouting by the first grouting.

In the case of forming the grouting pillar 23, the size of the steel pipe casing 52 may be as small as 200 to 300 mm to 3,000 mm or more as desired, and in the case of the aggregate used therein, If a large standard is used as it is, the strength is more advantageous than that of a large standard, which is advantageous in strength development. According to the present invention, there is no additional restriction on the aggregate size.

In the process of drawing the steel pipe casing 52 and the first injection pipe 26 after forming the grouting pillars 23 by the primary grouting low pressure injection of the Hi-FA grout material 55, The secondary grouting of the Hi-FA grout material is injected at low pressure through the pipe (28).

By injecting the secondary grout of the Hi-FA grout material to the ground disturbed when the steel pipe casing 22 is pulled out, the concrete column 20 and the concrete column 20 are injected into the concrete pipe 20 by the secondary grouting reinforcement of the Hi- And a grouting and grouting wall 60 is formed between the grouting pillar 23.

The Hi-FA grout material used for forming the grouting pillar 23 is a mixture of a general cement grout material and an HI-FA admixture for controlling the rheological property, and the mixed water and cement ratio is 40 to 150% The HI-FA admixture ratio is 2-4% of the mixed water. In addition, since the viscosity of Hi-FA grout material is 200 ~ 15,000 cps irrespective of the ratio of water and cement, HI-FA admixture has characteristics such as water separating ability, air retention property and permeability.

3: As shown in FIG. 3, when the general cement grout material 73 is poured into the water 70, the water-cement ratio is diluted immediately in the water as shown on the right side, while the Hi- Since the FA grout material 74 does not change the water-cement ratio due to the perfect water-separating property even in the water 70 like the side, the complete construction is possible.

4A, when the partition 72 is removed (which is the same as when the steel pipe casing 22 is pulled out), in the case of cement grouting by the cement grout material, the air wall breaks down. That is, when the water 70 and the sand 71 are laid on one side of the sidewall, the cement grout material 73 is laid on the other side of the adjacent sidewall, and then the partition 72 is removed, 4A, the water 70 and the sand 71 are laid on one side of the Hi-FA grout material 74, and Hi-FA grout material 74 and the partition 72 is removed, the grouting by the Hi-FA grout material 74 maintains the pore wall.

(Permeability): As shown in FIG. 5, the grouting by the cement grains 73 is non-uniformly injected according to the depth as shown on the right side, so that the heavy particles are subdivided by the difference in specific gravity of the cement grains, The powder is located in the upper direction and the difference in compressive strength between the lower part and the upper part is largely generated so that the lower part is infiltrated due to the lower water-cement ratio and the upper part is higher in water-cement ratio, The grouting by the ash 74 is homogeneously injected regardless of the depth, and penetration occurs constantly by the water-cement ratio presented on the design.

Therefore, due to the nature of the grouting by the Hi-FA grout material 74 as described above, the Hi-FA grout material penetrates between the ground disturbance area and the gap of the aggregate generated at the time of perforation and is reinforced by overlapping with the adjacent ball, The wall 60 is formed.

As shown in FIG. 1, a concrete wall 20 is formed in a concrete hole 20 between a concrete column 20 in which an H-file 23 is inserted and a concrete column 20 in which a reinforcing net 24 is inserted. The reinforcement and grouting wall 60 is formed between the concrete column 20 and the grouting column 50 at the same time as the grouting column 50 is formed, Air, cost, and stability.

6A to 6C, the construction process according to the present invention is performed in the following order.

The construction process of the earth retaining structure according to the H-CIP scheme according to the present invention will be described in more detail with reference to the plan view of the H-CIP construction according to the present invention shown in FIG.

(Step 101) Step of boring and drilling a steel pipe casing: In order to form a concrete column as shown, referring to the order of positions I, III, V, VII, II, IV, VI and VIII of FIG. 2, Drilling and drilling the ground 10 using the steel pipe casing 22 in the same manner as the (I, III, V, VII) position and the order of the (I, III, V, VII)

(Step 102) Inserting the H file into the steel pipe casing Step: Clogging the inside of the steel pipe casing 22 with the auger or T-4 to close the H file 23;

(Step 103) Placing concrete: Placing the concrete after inserting the H file 23;

(Step 104) Pulling out the steel pipe casing: After pouring the concrete, pulling out the steel pipe casing 22 to construct the concrete pillar 20 by the CIP method;

(Step 105) Step of boring and drilling a steel pipe casing between the concrete columns: In order to form the grouting pillar 50, the concrete formed at the position of the thumb hole of the CIP excavator (I, III, V, VII) After the columns 20 are installed, the grouting pillar 20 is formed by the positions and order of the (II, IV, VI, VIII) H-CIP grouting holes 22 between the concrete columns 20 and the columns 20 Drilling the ground (10) using a steel pipe casing (52) for forming the steel pipe (50);

(Step 106) Step of inserting the reinforcing net into the steel pipe casing Step: The soil inside the steel pipe casing 22 is augerated or T-4 is disposed and the reinforcing net 54 is installed in the steel pipe casing 52 Wow;

(Step 107) Installing a dual lumen installation: installing a dual lumen entrance (first and second injection pipes 56 and 57) after the step of approaching the reinforcing net 54;

(Step 108) Step of installing gravel and recycled aggregate for forming a grouting pillar: The steel pipe casing (52) is installed in a state where the double-prime entrance (first and second injection pipes (56, 57) Laying gravel for forming a grouting column and recycled aggregate (34) downward;

(Step 109) The first low pressure grouting step through the first injection pipe is carried out through the pre-installed dual inlet pipes (first and second injection pipes 56 and 57) and between the installed gravel and the recycled aggregate 34 A first grouting is performed by low-pressure injection of a Hi-FA grout material 74 to form a grouting pillar 50;

(Step 110) Steel pipe casing and first injection pipe drawing step: Primary grouting is performed by low-pressure injection of the Hi-FA grout material 74 to form a grouting pillar 50, And withdrawing the first injection tube (56);

(Step 111) Second Low Pressure Grouting through Second Injection Tube: In the process of withdrawing the steel pipe casing 52 and the first injection pipe 56 while withdrawing, a Hi-FA is injected through the second injection pipe 57 Performing a secondary grouting in which the grout material (74) is secondarily injected at a low pressure;

(Step 112) Second injection pipe drawing step: Second grouting through the second injection pipe of the Hi-FA grout material 74 to the disturbed ground at the steel pipe casing 22 and the first injection inlet drawing is performed at a low pressure injection Drawing the second injection pipe (57) while forming a retaining wall and a grouting wall (60) by additional reinforcement, that is, secondary grouting of the Hi-FA grout material (74); .

Accordingly, the wall for receiving the retaining wall and the reinforcing car is formed by the construction process shown in FIG. 6, and grouting is performed from the leading edge. Therefore, only disturbed soil and water are excluded, , Concrete slime is not generated, so that environmental secondary damage can be prevented.

7, a concrete column 20 including an H file (either a reinforcing net or a non-reinforced concrete) is placed on a foundation 10 as shown in FIG. (50) by low-pressure injection of the Hi-FA grout material in the H-CIP grouting hole (22), II, IV, VI and VIII by the grouting method, which is formed at positions I, III, A space between the circular columns and the pillars adjacent to each other by the low-pressure injection of the Hi-FA grout material at the time of drawing the pipe casing 52 and the first injection pipe, that is, a space between the concrete pillars 20 and the grouting pillars 50, -FA grout material 74 is connected by the grouting wall 60 by the secondary grouting low pressure injection through the second injection pipe so that the water flood separability and the fluidity are good and the adjacent columns are perfectly connected to each other, Or order It can also be used as a wall.

Therefore, according to the present invention, since the round wall is connected to the steel pipe casing filled with the aggregate, the crushed stone, the recycled aggregate and the like through the primary and secondary grouting in the nature of the HI-FA grout, It is advantageous in terms of air, construction cost, and stability to form a reinforcing and water wall structure even if the same additional car-receiving grout is not applied

FIGS. 8 and 9 are views respectively showing an example of two-hole spacing and three-hole spacing H-CIP according to the present invention.

As shown in FIG. 8, in the case of a two-ball spacing, an H file 23 (either a reinforcing net or a non-reinforcing net) is inserted as in the order of I, IV, VII, II, V, VIII, The concrete pillar 20 of the CIP method is sequentially formed by placing concrete or concrete mixer in the thumb holes I, IV and VII which are the CIP drilling holes 21 and the concrete pillar 20 Grouting pillars 50 are disposed by primary and secondary grouting by low-pressure injection of a Hi-FA grout material into two certified H-CIP grouting holes 51 at positions (II, III) and (V, . Construction order should be arranged in the order of Ⅰ, Ⅳ, Ⅶ, Ⅱ, Ⅴ, Ⅷ, Ⅲ, Ⅵ. The detailed construction process is the same as that described in Fig.

As shown in FIG. 9, in the case of the three-ball spacing, the thumb ball, which is the (I) th CIP drill hole 21, is in the order of I, III, V, VII, IX, II, IV, The concrete pillar 20 of the CIP method is installed by placing a concrete or a concrete mixer in the thumb hole where the H file 23 is inserted And the (Ⅲ) th CIP drilling hole 21 forms the concrete column 20 of the CIP method by inserting the concrete or concrete mixer into the reinforcing net 24 to form the concrete column 20, The H pile concrete column 20 and the reinforced concrete pillar concrete column 20 are also formed in the (V, VII) th column and then the H file 23 is inserted in the thumb hole of the (C) The concrete pillar 20 of the CIP method is formed by pouring concrete or concrete.

After the concrete column 20 is formed in the CIP thumb holes of the (I, III, V, VII, and IX) by the CIP method, the concrete columns 20 are formed between the (I, CIP position in the order of (Ⅱ, Ⅳ, Ⅵ, Ⅷ) in the (Ⅷ) th, (Ⅴ, Ⅶ) And the grouting pillar 50 is installed by low-pressure injection of the Hi-FA grout material. Construction order should be arranged in the order of Ⅰ, Ⅲ, Ⅴ, Ⅶ, Ⅸ, Ⅱ, Ⅳ, Ⅵ, Ⅷ. The detailed construction process is the same as that described in Fig.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It is within the scope of the present invention that component changes to such an extent that they can be coped evenly within a range that does not deviate from the scope of the present invention.

10: Ground 20: Concrete column
21: CIP drilling hole (Thumb hole) 22, 52: Steel pipe casing
23: H file 24, 54: reinforcing mesh
30: order wall 31: order grouting ball
50: Grouting column 51: H-CIP grouting ball
53, 75: Gravel and aggregate 55, 74: Hi-FA grout material
56: first injection tube 57: second injection tube
60: Grouting wall 70: Water
71: Sand 72: Partition
73: Cement grout material

Claims (11)

In a retaining structure using a concrete column,
The concrete column is inserted into a H file (reinforcing net or non-reinforced concrete), poured into concrete, drawn out of a steel pipe casing,
A first injection pipe installed in the center of the steel pipe casing for penetrating grouting, and a second injection pipe installed in the center of the steel pipe casing for introducing the reinforcing net into the gap between the concrete columns formed by the CIP method, Pressure grout material through the second injection pipe installed on both sides of the rim of the reinforcing bar net, the first injection grouting and the steel pipe casing are pulled out from the front between the gravel and the aggregate, A grouting pillar formed by a grouting method,
The grouting column is formed by forming a Hi-FA grout material through a second injection pipe during the drawing of the first injection pipe and the steel pipe casing between the grouting pillars formed adjacent to the concrete column by a secondary grouting low pressure injection A concrete column formed by the CIP method, a grouting wall formed by the grouting method adjacent thereto,
The concrete column and the adjacent grouting pillar are connected by the grouting wall,
The grouting Hi-FA grout material is a mixture of Hi-FA admixture for controlling the rheological properties of a general cement grout material. The ratio of mixed water to cement is 40 to 150%, and the ratio of Hi-FA admixture is mixed water 2 to 4%, and the viscosity of the Hi-FA grout material is 200 to 15,000 cps regardless of the ratio of water to cement.
The method according to claim 1,
The grouting pillar formed between the concrete columns formed by the CIP method is formed in at least one of the grouting columns.
delete delete The method according to claim 1,
Wherein a plurality of grouting columns are formed by a concrete column oriented by the CIP method and a grouting column formed by a grouting method of the low pressure injection,
delete delete In order to form a concrete column, a step of boring and drilling a ground using a steel pipe casing as a ground in the ground (Step 101);
A step (102) of clogging the soil inside the steel pipe casing with auger or T-4 to close the H-file (reinforcing net or non-reinforcing net);
(Step 103) of inserting concrete after inserting the H file;
Forming a concrete column by a CIP method by pouring the steel pipe casing after installing the concrete (104);
Drilling a ground by using a steel pipe casing in a grouting hole between the concrete column formed by the CIP method and the concrete column to form a grouting column (step 105);
(Step 106) of cladding the soil inside the steel pipe casing excavated in step 105 with auger or T-4, and closing the reinforcing net inside the steel pipe casing;
A step of installing a dual inlet pipe, which is a second injection pipe, on both sides of the rim of the reinforcing bar net and the first injection pipe at the central portion of the steel pipe casing for grouting introduced after the rebar net 16 is inserted (step 107) Wow;
(Step 108) of installing gravel for column formation and recycled aggregate under the inside of the steel pipe casing in a state in which the double inlet pipe (first and second inlet pipes) are installed with the reinforcing net 16;
(Step 109) of forming a grouting pillar by injecting a Hi-FA grout material at a low pressure between the installed gravel and the recycled aggregate through the installed dual inlet (first and second injection pipes) installed at a low pressure;
A step (110) of withdrawing the steel pipe casing and the first injection pipe while withdrawing the first pipe after the first grouting by low-pressure injection of the Hi-FA grout material;
(Step 111) a second grout injection of the Hi-FA grout material through the second injection pipe in the process of withdrawing the steel pipe casing and the first injection pipe and then injecting the Hi-FA grout material secondarily (step 111); And
A second grouting of the Hi-FA grout material is performed on the ground disturbed when the steel pipe casing is pulled out, and a second grouting and grouting wall formed by the second grouting injection of the Hi-FA grout material, which is an additional reinforcement step, Drawing the tube (step 112); / RTI >
The Hi-FA grout material is a mixture of a general cement grout material and a Hi-FA admixture that controls the rheological properties. The ratio of mixed water and cement is 40 to 150%. The ratio of Hi-FA admixture is 2 To 4%, and the viscosity of the grout material is in the range of 200 to 15,000 cps regardless of the ratio of water to cement. H-CIP construction method
delete The method of claim 8,
The grouting pillar formed between the concrete columns formed by the CIP method is formed in at least one of the above-mentioned grouting columns. The grouting pillar construction method using the H-CIP method delete

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