KR102605192B1 - Expanded urethane inserting type reinforced steel pipe one shot grouting and grouting method using the same - Google Patents

Abstract

The present invention is a grouting simultaneous injection steel pipe with an expansion material applied to reinforce the ground by penetrating into the inside of the ground and allowing grouting to occur. A plurality of grouting holes are formed on the outer surface to form a row, a hollow is formed on the inside, and the ground is reinforced. A steel pipe body penetrated into the interior at a certain depth; It includes a partition part installed in the hollow of the steel pipe body so as to partition the hollow inside the steel pipe body, wherein the partition part is located inside the hollow at a predetermined distance along the longitudinal direction of the steel pipe body. a first internal bulkhead fixedly installed along the radial direction of the steel pipe body, a second internal bulkhead fixedly disposed along the radial direction of the steel pipe body inside the hollow at a predetermined distance from the first internal bulkhead, and An expansion material that fills the space between the first internal bulkhead and the second internal bulkhead and is in close contact with the inner surface of the steel pipe body to partition the hollow, and the first internal bulkhead and the second internal bulkhead are fixed to the outer surface and the internal space It is characterized in that it consists of an injection pipe through which the grouting liquid is injected into the interior of the steel pipe body to perform grouting.

Description

Grouting simultaneous injection steel pipe with expansion material and grouting method using the same {EXPANDED URETHANE INSERTING TYPE REINFORCED STEEL PIPE ONE SHOT GROUTING AND GROUTING METHOD USING THE SAME}

The present invention relates to a grouting simultaneous injection steel pipe, and more specifically, by injecting an expansion material into a specific position of the steel pipe body and hardening it to accurately define the cavity of the steel pipe body, thereby reducing the cost and effort required to manufacture the steel pipe. This relates to a grouting simultaneous injection steel pipe using an expansion material that can save money and improve economic efficiency.

In general, grout or grouting is used to strengthen the bearing capacity of the excavated ground when constructing a tunnel, etc. in civil engineering work, or to inject filler into cracks and cavities in the ground for water leak prevention work and soil stability. This means that the filler (also called 'grouting material') is filled using gravity or a pump.

This grouting method installs a steel pipe in the ground, installs a packer inside the steel pipe, injects grouting material and solidifies it, making the steel pipe and the ground one, and increases the shear strength of the soil and rock. The injection is carried out inside the steel pipe. Therefore, it is a very advantageous construction method in terms of constructability and economic feasibility.

Typically, the steel pipe grouting method consists of drilling soft ground, inserting a steel pipe with a strainer installed into the drilling hole, inserting a sealing material between the steel pipe and the drilling hole, and injecting cement while installing a packer.

However, since this method inserts the steel pipe after drilling, it is impractical because it is difficult to insert the steel pipe in soft soil ground where the drill hole is difficult to maintain due to the collapse of the drill hole and the mixing of foreign substances.

To solve this problem, a direct drilling device has been developed that inserts a steel pipe at the same time as drilling.

Figure 1 is a plan view showing the structure of a conventional grouting simultaneous injection steel pipe.

As shown in Figure 1, the conventional grouting simultaneous injection steel pipe is designed to reinforce the ground by penetrating into the inside of the ground and allowing grouting to occur. A plurality of grouting holes are formed in a row on the outside and penetrate into the inside. A hollow 11 is formed and the steel pipe body 10 penetrates to a certain depth into the ground, and the hollow portion of the steel pipe body 10 to selectively partition the hollow 11 inside the steel pipe body 10 ( 11), which includes a partition 20 installed in the steel pipe body 10, where the partition 20 is located inside the hollow 11 at a certain distance along the longitudinal direction of the steel pipe body 10. A first support plate 21 installed along the radial direction, and a second support plate 22 installed along the radial direction of the steel pipe body 10 inside the hollow 11 at a certain distance from the first support plate 21. ) and is installed in the space between the first support plate 21 and the second support plate 22 and is pressed by the first support plate 21 and the second support plate 22, so that the inner surface and side surfaces of the steel pipe body 100 are The first support plate 21 is fixedly coupled to the outer surface to enable movement of the elastic member 23, which is in close contact with the hollow member 11, and the first support plate 21 is movable, and the first support plate 21 is injected with the grouting liquid. The injection pipe 24 and the second support plate 22 are fixedly coupled to the outer surface so that the second support plate 22 can be moved, and are composed of a second injection pipe 25 provided on the outer surface of the first injection pipe 24. .

The steel pipe body 10 is formed to have a circular cross-section, and a hollow 11 is provided inside the steel pipe body 10 so that the grouting liquid can flow out to the outside after being filled inside, and is formed as a tubular member with a certain length. and a plurality of grouting holes (10a) are formed through the outer surface of the steel pipe body (10).

The partition 20 serves to divide the hollow 11 into a plurality of spaces, and includes the first support plate 21, the second support plate 22, the expansion member 23, and the first and second injection pipes 24, 25).

The first support plate 21 is fixed to the outer surface of the first injection pipe 24, and the second support plate 22 is fixed to the outer surface of the second injection pipe 25, and the first injection pipe 24 is connected to the second injection pipe 24. The first support plate 21 and the second support plate 22, which are disposed inside the injection pipe 25, move in a direction to approach each other and press the elastic member 23 provided between them, thereby creating a plurality of hollows 11. It is divided into spaces of

In addition, a plurality of through holes 24a and 25a are formed through the outer surfaces of the first injection pipe 24 and the second injection pipe 25, respectively, so that the grouting liquid injected through the first injection pipe 24 is partitioned into hollow holes. It can be made to flow out to (11).

However, in this conventional grouting simultaneous injection steel pipe, in order to divide the hollow 11 of the steel pipe body 10 into a plurality of spaces, the first injection pipe 24 and the second injection pipe 24 protrude to the outside of the steel pipe body 10. By moving the injection pipe 25, the first support plate 21 and the second support plate 22 move in a direction where they approach each other, so that when the elastic member 23 is pressed, the area protruding out of the steel pipe body 10 and The pressing force pressing the elastic member 23 disposed in a close position can be formed strongly, but the pressing force pressing the elastic member 23 located at a long distance from the area protruding outside of the steel pipe body 10 is formed relatively weakly. It can be.

Therefore, the pressing force applied to the area protruding outside of the steel pipe body 10 and the elastic member 23 located at a long distance is lowered and the elastic member 23 is not properly deformed, so the side and As the adhesion with the inner surface of the steel pipe body 10 decreases, the pressure is not applied equally when injecting the grouting liquid through the first injection pipe 24, and as a result, there is a problem in that the steel pipe for simultaneous grouting injection is not accurately constructed. .

The present invention was developed to solve the problems described above. The interior of the steel pipe is accurately divided into a plurality of spaces, so that grouting is properly performed for each section, thereby ensuring accurate construction of the steel pipe with simultaneous grouting injection, and the expansion material is added to the steel pipe. We present a grouting simultaneous injection steel pipe using an expansion material that can improve economic efficiency by reducing the cost and effort required to manufacture the steel pipe by accurately dividing the hollow of the steel pipe body by injecting and hardening it at a specific location on the body. It is for that purpose.

In order to solve the above problem, the present invention is a grouting simultaneous injection steel pipe with an expansion material applied to reinforce the ground by penetrating into the inside of the ground and allowing grouting to occur. A plurality of grouting holes are formed on the outer surface to form a row, and the inner surface is formed through a plurality of grouting holes. a steel pipe body that is hollow and penetrates into the ground to a certain depth; It includes a partition part installed in the hollow of the steel pipe body so as to partition the hollow inside the steel pipe body, wherein the partition part is located inside the hollow at a predetermined distance along the longitudinal direction of the steel pipe body. a first internal bulkhead fixedly installed along the radial direction of the steel pipe body, a second internal bulkhead fixedly disposed along the radial direction of the steel pipe body inside the hollow at a predetermined distance from the first internal bulkhead, and An expansion material that fills the space between the first internal bulkhead and the second internal bulkhead and is in close contact with the inner surface of the steel pipe body to partition the hollow, and the first internal bulkhead and the second internal bulkhead are fixed to the outer surface and the internal space A grouting simultaneous injection steel pipe using an expansion material is presented, which consists of an injection pipe through which the grouting liquid is injected into the interior of the steel pipe body to perform grouting.

Here, a filling hole may be formed through one side of the outer surface of the steel pipe body forming the space so that the expansion material can be filled into the space.

Additionally, the expansion material is filled in the space through the filling hole and may be formed of a material that expands and hardens upon contact with air.

In addition, after filling the space with the expansion material, the protrusion that protrudes out of the filling hole when the expansion material expands due to contact with air can be cut.

In addition, a plurality of grouting holes are formed through a side surface of the steel pipe body, and the grouting liquid injected through the injection pipe is discharged to the outside on the outer surface of the injection pipe, fills the cavity, and then flows out to the outside through the grouting hole. As much as possible, through holes may be formed through the hole.

A one-way valve 242 may be installed in front of the injection pipe 240 to prevent backflow of the grouting liquid.

At the front end of the steel pipe body 100, an extension pipe 300 having a cut portion 310 capable of cutting may be installed.

A push rod hook 320 may be formed at the rear end of the extension tube 300 so that the push rod can be caught.

A caulking packer 330 may be installed in front of the extension pipe 300.

The present invention is a grouting method using the co-injection steel pipe, and the expansion material 230 is filled in the space between the first internal partition 210 and the second internal partition 220 to form the partition 200. manufacturing the co-injection steel pipe; Inserting and installing the simultaneous injection steel pipe into a drilling hole in the ground; Injecting the grouting liquid into the interior of the steel pipe body 100 through the injection pipe 240 and injecting the grouting liquid into the ground through the grouting hole 101 of the steel pipe body 100; A grouting method characterized by including:

The present invention is a grouting method using the co-injection steel pipe, and the expansion material 230 is filled in the space between the first internal partition 210 and the second internal partition 220 to form the partition 200. manufacturing the co-injection steel pipe; A step of coupling the extension pipe 300 to the front end of the steel pipe body 100; Inserting and installing the simultaneous injection steel pipe into a drilling hole in the ground by hooking a push bar to the push bar hanger 320 and pushing it in; Expanding the caulking packer 330 to close the opening of the perforation hole into which the simultaneous injection steel pipe is inserted; Injecting the grouting liquid into the interior of the steel pipe body 100 through the injection pipe 240 and injecting the grouting liquid into the ground through the grouting hole 101 of the steel pipe body 100; A grouting method comprising the step of cutting a portion of the extension pipe 300 protruding forward of the opening of the drilling hole is presented.

The grouting simultaneous injection steel pipe using the expansion material according to the present invention has the effect of ensuring that the interior of the steel pipe is accurately divided into a plurality of spaces and that the sealing force is maintained in each space, thereby ensuring proper grouting for each section.

In addition, by injecting the grouting solution into the divided steel pipes, the pressure at which the grouting solution is injected is applied uniformly during grouting construction, which has the effect of ensuring that the simultaneously injected steel pipes can be accurately constructed.

In addition, by injecting the expansion material into a specific location of the steel pipe body and hardening it, the cavity of the steel pipe body can be accurately divided, thereby reducing the cost and effort required to manufacture the steel pipe, thereby improving economic efficiency.

Figure 1 is a plan view showing the structure of a conventional grouting simultaneous injection steel pipe;
Figure 2 is a plan view showing the structure of a grouting simultaneous injection steel pipe using an expansion material according to an embodiment of the present invention;
Figure 3 is a plan view showing the structure of a grouting simultaneous injection steel pipe using an expansion material according to another embodiment of the present invention;
Figure 4 is a plan view showing the structure of a grouting simultaneous injection steel pipe using an expansion material according to another embodiment of the present invention;
Figure 5 is a plan view showing the structure of a grouting simultaneous injection steel pipe using an expansion material according to another embodiment of the present invention;
Figure 6 is a construction state diagram showing a state in which a grouting co-injection steel pipe to which an expansion material according to the present invention is applied is constructed on the ceiling of a tunnel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figures 2 to 5 are plan views showing the structure of a grouting simultaneous injection steel pipe to which an expansion material is applied according to an embodiment of the present invention, and Figure 6 shows a state in which a grouting simultaneous injection steel pipe to which an expansion material according to the present invention is applied is constructed on the ceiling of a tunnel. This is a construction state diagram.

As shown in these drawings, the grouting simultaneous injection steel pipe to which the expansion material according to the present invention is applied is a grouting simultaneous injection steel pipe to which an expansion material is applied to reinforce the ground by penetrating into the inside of the ground and allowing grouting to occur. A steel pipe body (100) through which a plurality of grouting holes are formed in a row, a plurality of hollow holes (110) are formed inside, and the steel pipe body (100) is penetrated to a certain depth into the ground; It includes a partition 200 installed in the hollow 110 of the steel pipe body 100 so as to partition the hollow 110 inside the steel pipe body 100, and the partition 200 is A first internal bulkhead 210 fixedly installed along the radial direction of the steel pipe body 100 inside the hollow 110 at a predetermined distance along the longitudinal direction of the steel pipe body 100, and the first A second internal partition 220 fixedly disposed along the diameter direction of the steel pipe body 100 inside the hollow 110 at a predetermined distance from the internal partition 210, and the first internal partition 210 and an expansion material 230 that fills the space between the second internal bulkhead 220 and is in close contact with the inner surface of the steel pipe body 100 to partition the hollow 110, the first internal bulkhead 210, and The second internal partition 220 is fixed to the outer surface and is characterized by an injection pipe 240 through which grouting liquid is injected into the interior of the steel pipe body 100 through the internal space to perform grouting.

The steel pipe body 100 is formed to have a certain length and penetrates into the ground, such as the ceiling or slope of a tunnel, to reinforce the ground, thereby improving the structural stability of structures such as a tunnel or slope.

In addition, in order to further improve the structural stability of structures such as tunnels and slopes, the inside of the steel pipe body 100 is filled with the grouting liquid and then the grouting liquid is allowed to flow out of the steel pipe body 100 into the inside of the ground. The ground around the body 100 and the steel pipe body 100 are made to be integrated, and for this purpose, a plurality of grouting holes 101 are formed through the side of the steel pipe body 100.

The steel pipe body 100 is formed to have a circular cross-section, and a hollow 110 is provided inside the steel pipe body 100 so that the grouting liquid can flow out to the outside after being filled inside, and is formed as a tubular member with a certain length. It is done.

The length of the steel pipe body 100 can be determined depending on the strength of the ground into which the steel pipe is to be penetrated and installed. In the case of soft ground where the strength of the ground is relatively weak, the length of the steel pipe body 100 is formed to be long so that the steel pipe can be penetrated to a deep depth. This must be achieved, and in the case of relatively strong ground, it is desirable to make the length of the steel pipe body 100 short so that the penetration depth is not deep to facilitate penetration construction.

The head of the steel pipe body 100, which is exposed to the outside when the steel pipe body 100 is penetrated into the ground, is provided with an upper surface that shields the hollow of the steel pipe body 100 from the outside, and an injection pipe 240, which will be described later, is located in the center of the upper surface. ) is formed with a through hole 120 into which it is inserted.

And, on one inner side of the steel pipe body 100 that is in contact with the expandable material 230, which will be described later, is filled so that the space between the first internal partition 210 and the second internal partition 220 can be filled with the expandable material 230. A hole 102 is formed through the hole.

The partition 200 is largely divided into a first internal bulkhead 210 that is fixedly coupled to be spaced apart from each other at a predetermined distance so as to partition the hollow 110 inside the steel pipe body 100, and a predetermined distance from the first internal bulkhead 210. The space between the second internal bulkhead 220, which is fixed at a spaced apart position, and the first internal bulkhead 210 and the second internal bulkhead 220 is filled and is in close contact with the inner surface of the steel pipe body 100, thereby forming a hollow 110. ), the expansion material 230, the first internal bulkhead 210, and the second internal bulkhead 220 are fixed to the outer surface, and the grouting liquid is injected into the inside of the steel pipe body 100 through the internal space. It consists of an injection pipe 240 that allows grouting to occur.

The first internal bulkhead 210 and the second internal bulkhead 220 are formed in a disk shape with a circular cross-section identical to that of the steel pipe body 100 and have a certain thickness, and are hollow along the longitudinal direction of the steel pipe body 100. It is installed to be fixed to and serves to partition the hollow 110.

In addition, the first internal partition 210 and the second internal partition 220 are fixed inside the hollow 110 to partition the hollow 110. ) are each fixed to the outer surface of the injection pipe 240 by joining, such as welding.

Meanwhile, the expansion material 230 fills the space between the first internal partition 210 and the second internal partition 220 and comes into close contact with the inner surface of the steel pipe body 100, thereby serving to accurately define the hollow 110. .

This expansion material 230 is filled in the space through the filling hole 102 and is made of urethane, silicone, etc., which expand and harden upon contact with air.

Urethane-based expansion materials are not thermosetting resins, but are synthetic resins with a similar three-dimensional structure. They are tough and resistant to chemicals, so they are used in electrical insulators, structural materials, foam insulation materials, foam cushions, and elastic fibers. They are also used in rubber due to their good elasticity. It is also used as a substitute for .

Since the urethane-based expansion material expands and hardens when in contact with air, when it is filled in the space between the first internal partition 210 and the second internal partition 220 and a certain period of time passes while in contact with air. Hardening occurs in close contact with the inner wall of the space.

In addition, after the expansion material is filled in the space, a certain amount protrudes out of the filling hole 102 during expansion due to contact with air to form a protrusion 231. This protrusion 231 is removed by cutting to form a steel pipe. It is desirable for the outer surface of the body 100 to be smooth.

The injection pipe 240 allows the first internal bulkhead 210 and the second internal bulkhead 220 to be fixed by joining such as welding at a certain distance from the outer surface, and the grouting liquid flows through the internal space into the steel pipe body ( It is injected into the interior of the 100) and serves to enable grouting.

To this end, through-holes 241 are formed on the outer surface of the injection pipe 240 at regular intervals at a plurality of locations along the longitudinal direction of the injection pipe 240, and the grouting liquid injected into the injection pipe 240 passes through the holes. By allowing the grouting liquid to be discharged to the outside through 241, the partitioned hollow 110 can be uniformly filled with the grouting liquid.
One injection pipe 240 is installed inside the steel pipe body 100 (Figure 2).
A plurality of grouting holes 101 are formed through the side of the steel pipe body 100, and the grouting liquid injected through the injection pipe 240 is discharged to the outside on the outer surface of the injection pipe 240, forming a plurality of hollow holes 110. After it is filled, a plurality of through holes 241 are formed through it so that it flows out to the outside through the grouting hole 101 (FIG. 2).
The grouting liquid injected into the injection pipe 240 is discharged to the outside through the hole 241, so that the plurality of hollow cavities 110 are uniformly filled with the grouting liquid.
The space is formed by the area between the lower surface of the first internal partition 210, the upper surface of the second internal partition 220, and the outer surface of one injection pipe 240 (FIG. 2).
The expansion material 230 fills the entire space, thereby forming the protrusion 231 that protrudes out of the filling hole 102 when expanded (FIG. 2).

A one-way valve 242 may be installed in front of the injection pipe 240 to prevent backflow of the grouting liquid (FIG. 4).

This can prevent the grouting liquid from flowing back even if the injection of the grouting liquid is stopped while the internal injection pressure is increased due to the injection operation of the grouting liquid.

At the front end of the steel pipe body 100, an extension pipe 300 in which a cut portion 310 (grooving portion) that can be cut may be formed may be installed.

After insertion and installation of the steel pipe body 100 and the extension pipe 300 into the perforation hole, a portion of the extension pipe 300 may be exposed through the opening of the perforation hole. In this case, the extension pipe exposed by cutting the incision 310 ( 300) can be easily removed.

A push rod hook 320 may be formed at the rear end of the extension tube 300 to allow the push rod to be caught.

When inserting and installing the steel pipe body 100 and the extension pipe 300 into the drilling hole, the end of the steel pipe structure pusher is hung on the upper pusher hanger 320 and the pusher is pushed to the rear (tip side) of the drilling hole. You can perform insertion and installation work.

A caulking packer 330 may be installed in front of the extension pipe 300.

After insertion and installation of the steel pipe body 100 and the extension pipe 300 into the perforation hole, the opening of the perforation hole is closed by expansion of the caulking packer 330, and grouting is performed in this state, thereby injecting the steel pipe simultaneously with the perforation hole. It is possible to prevent the grouting liquid injected through the gap from leaking out through the opening of the drilling hole.

The grouting method using a co-injection steel pipe according to the present invention is carried out by the following process.

A simultaneous injection steel pipe is manufactured by filling the space between the first internal partition 210 and the second internal partition 220 with the expansion material 230 to form a partition 200.

The simultaneous injection steel pipe is inserted and installed into a drilling hole in the ground by coupling the extension pipe 300 to the front end of the steel pipe body 100 and inserting the push rod into the drill hole in the ground.

The caulking packer 330 is expanded to close the opening of the perforation hole into which the simultaneous injection steel pipe is inserted.

The grouting liquid is injected into the interior of the steel pipe body 100 through the injection pipe 240, and the grouting liquid is injected into the ground through the grouting hole 101 of the steel pipe body 100.

A portion of the extension tube 300 protruding in front of the opening of the perforation hole is cut.

The grouting simultaneous injection steel pipe with the expansion material according to the present invention having the above-described configuration is divided into sections when filling the grouting liquid using the injection pipe 240 while being penetrated into the inside of the ground, such as a slope or the ceiling of a tunnel. After the grouting liquid is filled in each hollow 110 at a uniform pressure, it is allowed to flow into the ground at a uniform pressure through the grouting hole 101 formed in the steel pipe body 100, so that the ground is damaged by the steel pipe body 100. Reinforcement can be achieved (Figure 6).

Since the above is only a description of some of the preferred embodiments that can be implemented by the present invention, as is well known, the scope of the present invention should not be construed as limited to the above embodiments, and the scope of the present invention described above Both the technical idea and the technical idea underlying it will be said to be included in the scope of the present invention.

100: steel pipe body 101: grouting ball
110: hollow 120: through hole
200: partition 210: first internal bulkhead
220: second internal bulkhead 230: expansion material
240: injection pipe 241: through hole

Claims (11)

A grouting simultaneous injection steel pipe applied with an expansion material that penetrates into the ground and allows grouting to reinforce the ground,
A steel pipe body (100) with a plurality of grouting holes formed in a row on its outer surface, a plurality of hollow holes (110) formed on its inner surface, and penetrating to a certain depth into the ground;
It includes a partition 200 installed in the hollow 110 of the steel pipe body 100 to partition the hollow 110 inside the steel pipe body 100,
The partition 200 is a first internal bulkhead that is fixedly installed along the diametric direction of the steel pipe body 100 inside the hollow 110 at a predetermined distance along the longitudinal direction of the steel pipe body 100. (210), and a second internal partition 220 fixedly disposed along the radial direction of the steel pipe body 100 inside the hollow 110 at a predetermined distance from the first internal partition 210, An expansion material 230 that is filled in the space between the first internal partition 210 and the second internal partition 220 and is in close contact with the inner surface of the steel pipe body 100 to partition the hollow 110, and The first internal bulkhead 210 and the second internal bulkhead 220 are fixed to the outer surface, and an injection pipe 240 is provided through which the grouting liquid is injected into the inside of the steel pipe body 100 through the internal space to perform grouting. It consists of:
A filling hole 102 is formed through one side of the outer surface of the steel pipe body 100 forming the space so that the expansion material 230 can be filled in the space,
The expansion material 230 is filled in the space through the filling hole 102 and is made of a material that expands and hardens when in contact with air,
After the expansion material 230 is filled in the space, the protrusion 231 protruding out of the filling hole 102 is cut when the expansion material 230 is expanded due to contact with air,
One injection pipe 240 is installed inside the steel pipe body 100,
A plurality of grouting holes 101 are formed through a side surface of the steel pipe body 100, and the grouting liquid injected through the injection pipe 240 is discharged to the outside on the outer surface of the injection pipe 240, thereby forming the plurality of grouting holes 101. After filling the hollow 110, a plurality of through holes 241 are formed to flow out to the outside through the grouting hole 101,
The grouting liquid injected into the injection pipe 240 is discharged to the outside through the through hole 241, so that the plurality of hollow cavities 110 are uniformly filled with the grouting liquid,
The space is formed by an area between the lower surface of the first internal partition 210, the upper surface of the second internal partition 220, and the outer surface of the one injection pipe 240,
The expansion material 230 fills the entire area of the space, thereby forming the protrusion 231 that protrudes out of the filling hole 102 when expanded. delete delete delete delete According to paragraph 1,
A grouting simultaneous injection steel pipe using an expansion material, characterized in that a one-way valve 242 is installed in front of the injection pipe 240 to prevent backflow of the grouting liquid. According to paragraph 1,
A grouting simultaneous injection steel pipe using an expansion material, characterized in that an extension pipe 300 having a cut portion 310 capable of cutting is installed at the front end of the steel pipe body 100. In clause 7,
A grouting simultaneous injection steel pipe using an expansion material, characterized in that a push bar hanger 320 is formed at the rear end of the extension pipe 300 so that the push bar is caught. According to clause 8,
A grouting simultaneous injection steel pipe using an expansion material, characterized in that a caulking packer 330 is installed in front of the extension pipe 300. A grouting method using the simultaneous injection steel pipe of any one of paragraphs 1, 6 to 9,
Manufacturing the co-injection steel pipe by filling the space between the first internal partition 210 and the second internal partition 220 with the expandable material 230 to form the partition 200;
Inserting and installing the simultaneous injection steel pipe into a drilling hole in the ground;
Injecting the grouting liquid into the interior of the steel pipe body 100 through the injection pipe 240 and injecting the grouting liquid into the ground through the grouting hole 101 of the steel pipe body 100;
A grouting method comprising: As a grouting method using the simultaneous injection steel pipe of Paragraph 9,
Manufacturing the co-injection steel pipe by filling the space between the first internal partition 210 and the second internal partition 220 with the expandable material 230 to form the partition 200;
A step of coupling the extension pipe 300 to the front end of the steel pipe body 100;
Inserting and installing the simultaneous injection steel pipe into a drilling hole in the ground by hooking a push bar to the push bar hanger 320 and pushing it in;
Expanding the caulking packer 330 to close the opening of the perforation hole into which the simultaneous injection steel pipe is inserted;
Injecting the grouting liquid into the interior of the steel pipe body 100 through the injection pipe 240 and injecting the grouting liquid into the ground through the grouting hole 101 of the steel pipe body 100;
Cutting a portion of the extension tube 300 protruding forward of the opening of the drilling hole;
A grouting method comprising:

Images