KR101655046B1

KR101655046B1 - Mutlti-stage grouting apparatus and method

Info

Publication number: KR101655046B1
Application number: KR1020150145518A
Authority: KR
Inventors: 장윤종
Original assignee: 장윤종
Priority date: 2015-10-19
Filing date: 2015-10-19
Publication date: 2016-09-07

Abstract

The present invention relates to a multi-stage grout injection apparatus using a multi-stage steel pipe capable of highly efficiently injecting grout into the periphery of a perforation hole by using a multi-stage steel pipe.
The multi-stage grout injection apparatus according to the present invention comprises: an outer pipe having a plurality of first grout holes; An inner tube movably inserted in the outer tube and having a plurality of second grout holes; And a moving mechanism for moving any one of the inner tube and the outer tube, wherein at least one of the plurality of first grout holes, Characterized in that the ball is configured to communicate stepwise with at least a part of the second grout hole among the plurality of second grout holes.

Description

MUTLTI-STAGE GROUTING APPARATUS AND METHOD [0002]

The present invention relates to a grouting injection apparatus, and more particularly, to a multi-stage grout injection apparatus and a multi-stage grout injection method which can inject grout into a periphery of a perforation hole with high efficiency by using a multi-stage steel pipe without requiring a packer.

The ground reinforcement method is a method for strengthening the bearing capacity of the soil or ground for constructing various structures, such as a pile reinforcement method, a micro pile method, and a grouting method.

The pile reinforcement method is a method of constructing a pile in the ground and then constructing an existing pile or field pile.

The micro-pile method is a method of injecting grouting after inserting a pile of small diameter into the pore of the ground.

The grouting method is a method in which the grouting material is injected into the perforation of the ground and the grout material is fed through the injection pipe to the ground to fill the ground and the soil is solidified after a lapse of a certain period of time to increase the impermeability of the ground, For the purpose of construction, or to increase the strength of the ground and to stabilize the ground.

Meanwhile, in the grouting method, a multi-stage grouting method is applied to pressurized grouting using a packer in order to maximize the injection effect. Such a multi-stage grouting method is a method of sequentially installing the packers.

A typical multistage grouting method includes the steps of: (a) forming a perforation hole in the ground by a predetermined depth to form a perforation hole; (b) inserting a check valve in the injection hole of the injection pipe and accurately positioning the injection pipe in the perforation hole (C) sealing the gap between the inlet tube and the perforation hole while caulking between the inlet of the perforation hole and the inlet tube to pressurize the grout, while (c) preventing the flow of the grout material, and d) A plurality of packers shrinking and expanding by air or hydraulic pressure are inserted into the injection tube to gradually move the packers according to the injection hole positions of the injection tube from the deepest depth to the upper portion. The expansion of the packer, the injection of gravity , The shrinkage of the packer, the movement of the packer, and the installation of the packer are carried out so that the grout is injected in a multi-stage manner.

Meanwhile, according to the type of packer, the multi-stage grouting method includes a double packer method of injecting grout into multi-stages using a pair of packers vertically spaced up and down inside a perforation hole, And a single packer method in which the grout is continuously injected by using a packer of a single packer.

In the double packer method, high pressure injection can be performed by injecting grout between a pair of packers, and a single packer method is a method of low pressure inside the hole due to continuous injection of grout.

In the conventional multi-stage grout method, the packer must be pulled out in correspondence with the injection port of the injection pipe after the packer is installed, but it is difficult for the skilled operator to smoothly pull out the packer, .

In addition, the conventional multi-stage grouting method has a disadvantage in that it takes a long time to grout the grout because the expansion of the packer and the pulling of the packer have to be repeatedly carried out over various processes.

In addition, the conventional multi-stage grouting method has a disadvantage in that the quality control of grouting can not be stably maintained because the grouting process using the packer is very complicated.

KR 10-1045727 B1 (July 4, 2011)

The present invention has been researched and developed to solve the drawbacks of the prior art as described above, and it is an object of the present invention to provide a method and apparatus for grouting by using a grouting injection method using an outer pipe and an inner pipe without using a packer, The present invention has been made in view of the above problems, and it is an object of the present invention to provide a multi-stage grout injection apparatus and a method thereof, which can keep the quality control of grout stably.

According to an aspect of the present invention, there is provided a multi-stage grout injection apparatus,

An outer appearance having a plurality of first grout holes;

An inner tube movably inserted in the outer tube and having a plurality of second grout holes; And

And a moving mechanism for moving any one of the inner tube and the outer tube,

The at least one first grout hole of the plurality of first grout holes communicating stepwise with at least a part of the second grout hole of the plurality of second grout holes as one of the inner tube and the outer tube moves by the moving mechanism .

And the moving mechanism is configured to linearly move any one of the outer tube and the inner tube along the longitudinal direction.

And the moving mechanism is configured to rotate any one of the outer tube and the inner tube in the circumferential direction.

The upper end of the inner pipe is located above the upper end of the outer pipe, and the grout injection cap is installed at the upper end of the inner pipe.

Another aspect of the present invention is a multi-stage grout injection method using an outer pipe having a plurality of first grout holes, an inner pipe having a plurality of second grout holes, and a moving mechanism for relatively moving the inner pipe and the outer pipe,

An outer appearance installation step of inserting the outer pipe into the perforation hole of the ground;

An inner tube mounting step of inserting the inner tube into the outer tube;

And injecting the grout by moving at least one of the outer tube and the inner tube so as to communicate at least a part of the first grout hole and at least a part of the inner tube of the inner tube with the second grout hole.

According to the present invention, while moving the inner tube step by step inside the outer tube, the first grout holes of the outer tube and the first grout hole and the second grout hole of some of the inner tube second grout holes are communicated stepwise or selectively By injecting grout in the perforation hole of the ground, grouting can be performed very uniformly in the ground, and the grouting can be carried out very easily and quickly, and the quality control of the grouting can be stably maintained.

1 is an exploded cross-sectional view illustrating a multi-stage grout injection apparatus according to an embodiment of the present invention.
FIG. 2 is a side sectional view showing a state in which a multi-stage grout injection apparatus according to an embodiment of the present invention is installed in a perforation hole in an underground, wherein an inner pipe is inserted into a lower end of an outer pipe.
FIG. 3 is a view illustrating a state in which the inner pipe moves upward in a first direction in the outer tube in the multi-stage grout injection apparatus according to the embodiment of the present invention.
FIG. 4 is a view illustrating a state in which the inner pipe moves upwards in the inside of the outer tube in the multi-stage grout injection apparatus according to an embodiment of the present invention.
5 is a side cross-sectional view illustrating a multi-stage grout injection apparatus according to another embodiment of the present invention.
6 is a plan sectional view taken along line AA in Fig.
Fig. 7 is a plan sectional view along the arrow BB line in Fig. 5. Fig.
8 is a plan sectional view taken along the line CC of FIG.
9 is a cross-sectional view illustrating one embodiment of a moving mechanism of the multi-stage grout injection apparatus according to the present invention.
10 is an operating state view showing a state in which the inner pipe and the outer pipe are chucked by the first chucking mechanism and the second chucking mechanism in the moving mechanism of the multi-stage grout injection apparatus according to the present invention.
11 is an operational state diagram showing a state in which the first chucking mechanism and the inner pipe are moved upward by the moving unit in the moving mechanism of the multi-stage grout injection apparatus according to the present invention.
12 is a plan sectional view taken along line BB in Fig.
13 is a plan sectional view taken along line CC in Fig.
Fig. 14 is a plan sectional view along DD line in Fig. 9. Fig.
15 is a plan sectional view taken along the line EE of Fig.
16 is a process diagram showing a multi-stage grout injection method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

1 to 4 are views showing a multi-stage grout injection apparatus according to an embodiment of the present invention.

1 to 4, a multi-stage grout injection apparatus according to an embodiment of the present invention includes an outer tube 10, an inner tube 20 installed inside the outer tube 10 so as to be movable up and down along the longitudinal direction, And a moving mechanism (40) for moving at least one of the outer tube (10) and the inner tube (20) step by step.

The outer tube 10 is elongated in the longitudinal direction. The outer tube 10 has a plurality of first grout holes 11, 12 and 13 formed on its side walls and a plurality of first grout holes 11, 12 and 13 are spaced apart along the longitudinal direction of the outer tube 10 And a sealing member such as an O-ring or the like may be installed at the edge of each of the first grout holes 11, 12,

According to one embodiment, the outer tube 10 may be open at both its upper and lower ends.

According to another embodiment, the closed end 15 may be formed at the lower end of the outer tube 10, and the leakage of the grout through the lower end of the outer tube 10 may be prevented.

The inner tube 20 is elongated in the longitudinal direction and inserted into the inside of the outer tube 10. In particular, the center of the inner tube 20 and the center of the outer tube 10 may be arranged in the same manner to form a concentric circular cross section.

The inner tube 20 has a plurality of second grout holes 21, 22 and 23 formed in its side walls and a plurality of second grout holes 21, 22 and 23 are spaced apart along the longitudinal direction of the inner tube 20 And a sealing member such as an O-ring or the like may be provided at the edge of each of the second grout holes 21, 22,

According to one embodiment, the inner tube 20 may be open at both its upper and lower ends.

According to another embodiment, a closed end 25 may be formed at the lower end of the inner tube 20 so that leakage of the grout through the lower end of the inner tube 20 can be prevented.

The outer diameter of the inner pipe 20 is formed to be similar to or slightly smaller than the inner diameter of the outer pipe 10 so that the inner pipe 20 can be easily moved along the longitudinal direction inside the outer pipe 10.

A grout injection cap 30 may be sealingly installed at the upper end of the inner pipe 20 and a grout hose 31 for transferring grout may be connected to the grout injection cap 30. The grout injection port 30 may be connected to a grout hose 31 A grout pump (not shown) for pumping the grout may be connected. Thus, the grout can be injected into the inner pipe 20 through the grout injection cap 30.

The upper end 26 of the inner tube 20 is configured to protrude above the upper end 16 of the outer tube 10 and the upper end 26 of the inner tube 20 protrudes upward from the ground, It is easy to install the grouting cap 31 at the upper end of the inner tube 20 and the inner tube 20 can be easily moved by the moving mechanism 40.

According to various embodiments of the present invention, the moving mechanism 40 may be configured to move the inner tube 20 stepwise along the longitudinal direction inside the outer tube 10 with the outer tube 10 fixed.

As the inner tube 20 moves along the longitudinal direction inside the outer tube 10, the second grout holes 21, 22, 23 of the inner tube 20 and the first grout holes 11, , 12, 13), at least one second grout hole and at least one first grout hole are selectively and step-wise communicable.

Particularly, as the inner pipe 20 moves upward in the inside of the outer tube 10, the first grout holes 11, 12, 13 of the outer tube 10 are inserted into the second grout holes 21, 22, 23).

1 to 4 illustrate three first grout holes 11, 12 and 13 of the outer tube 10 and three second grout holes 21, 22 and 23 of the inner tube 20, The number of holes can be varied according to the depth of the holes 1, the type of grout, and the like. The diameter and the spacing distance of the first and second grout holes 11, 12, 13, 21, 22, and 23 are set such that the first and second grout holes, And can be configured in various ways to communicate.

Hereinafter, the grouting process by the multi-stage grout injection apparatus according to various embodiments of the present invention will be described in detail.

The outer tube 10 is inserted into the perforation hole 1 of the ground and the inner tube 20 is inserted into the outer tube 10 as shown in Fig. At this time, the inner tube 20 can be inserted into the inside of the outer tube 10 such that the closed end 25 of the inner tube 20 is close to the closed end 15 of the outer tube 10. [

When the inner tube 20 is inserted into the outer tube 10 as described above, the first grout hole 11 positioned at the lowermost side of the outer tube 10 and the second first grout hole 11 positioned at the lowermost side of the inner tube 20, The grout holes 21 communicate with each other and all the remaining grout holes of the outer tube 10 and the inner tube 20 remain closed. The grout supplied through the grouting cap 30 in this state is guided to the periphery of the perforation hole 1 through the outer pipe 10 communicating with each other and the lowermost (first) grout holes 11 and 21 of the inner pipe 20 Can be injected.

Thereafter, as shown in Fig. 3, when the inner tube 20 is moved upwardly along the longitudinal direction by a predetermined interval by the moving mechanism 40 (see arrow K direction in Fig. 3), the second So that the grout hole 22 is in communication with the second first grout hole 12 of the outer tube 10. At this time, all the remaining grout holes of the outer tube 10 and the inner tube 20 are kept closed. The grout supplied through the grouting cap 30 in this state can be injected into the periphery of the perforation hole 1 through the outer grooves 10 communicating with each other and the second grout holes 12 and 22 of the inner pipe 20. [ have.

4, the inner pipe 20 is moved upward by a predetermined distance along the longitudinal direction (see the arrow K direction in FIG. 4) by the moving mechanism 40, and the inner pipe 20 is located on the uppermost side of the inner pipe 20 And the third second grout hole 23 communicates with the third first grout hole 13 located on the uppermost side of the outer tube 10. [ At this time, all the remaining grout holes of the outer tube 10 and the inner tube 20 are kept closed. The grout supplied through the grouting cap 30 in this state can be injected into the periphery of the perforation hole 1 through the outer grooves 10 communicating with each other and the third grout holes 13 and 23 of the inner pipe 20. [ have.

As described above, by moving the inner tube 20 along the longitudinal direction inside the outer tube 10, the second grout holes 21, 22, 23 of the inner tube 20 and the first grout holes 11, 12, and 13 can be selectively / stepwise communicated. Thus, sequential and gradual multi-stage grouting can be carried out from the bottom to the top of the perforation hole 1 very easily and accurately. In addition, Therefore, the grouting method for reinforcing the ground can be implemented more effectively.

Alternatively, the inner pipe 20 and the outer pipe 10 are fixed according to the member stresses of the inner pipe 20 and the outer pipe 10, and the outer pipe 10, and then the grout is injected and cured. Thus, the steel pipe piling method for ground reinforcement, You can also implement a file method.

For example, when the outer tube 10 and / or the inner tube 20 are fixed in the ground when the outer diameter of the outer tube 10 is small (about 150 to 200 mm), the grout is injected and cured, It is possible to construct a microfile with on-site installation with improved quality by increasing the physical property of the surrounding ground.

In another example, when the outer tube 10 and / or the inner tube 20 are fixed in the ground when the outer diameter of the outer tube 10 is large (about 400 to 800 mm), grouting is performed by injecting and hardening the outer tube 10 and / It is possible to construct a quality cast-in-place steel pipe pile.

In short, the multi-stage grout injection apparatus of the present invention has a plurality of first grout holes (11, 12, 13) and a plurality of second grout holes (21, 22, 23) through relative movement of the inner pipe (20) ), The grout can be injected very uniformly and quickly, thereby greatly improving the quality of the grouting. In addition, the multi-stage grout injection apparatus of the present invention can be easily utilized as a pile method for ground reinforcement or a micro pile method for ground reinforcement in addition to the grouting method for ground reinforcement.

5 to 8 are views showing a multi-stage grout injection apparatus according to another embodiment of the present invention.

5 to 8, a multi-stage grout injection apparatus according to another embodiment of the present invention includes an outer tube 10, an inner tube 20 rotatably installed inside the outer tube 10, And a moving mechanism 40 that rotates stepwise.

The outer tube 10 has a plurality of first grout holes 11a, 11b, 11c, 11d, 11e and 11f formed on its side walls and a plurality of first grout holes 11a, 11b, 11c, May be formed to be spaced along the longitudinal direction of the outer tube 10.

In particular, the plurality of first grout holes 11a, 11b, 11c, 11d, 11e, and 11f located at the same height may be spaced apart in the circumferential direction, as shown in FIGS.

The inner tube 20 has a plurality of second grout holes 21a, 21b, 21c and 21d formed on the side walls thereof and a plurality of second grout holes 21a, 21b, 21c and 21d, And may be formed to be spaced along the circumferential direction.

In particular, the plurality of second grout holes 21a, 21b, 21c, and 21d located at the same height may be spaced apart in the circumferential direction, as shown in FIGS.

According to another embodiment of the present invention, the moving mechanism 40 is configured to rotate the inner tube 20 in the circumferential direction inside the outer tube 10 with the outer tube 10 fixed.

As described above, as the inner tube 20 rotates in the circumferential direction inside the outer tube 10, the second grout holes 21a, 21b, 21c, and 21d of the inner tube 20 and the first grout At least one second grout hole and at least one first grout hole among the holes 11a, 11b, 11c, 11d, 11e, and 11f may be selectively or stepwise communicated.

Particularly, as the inner tube 20 rotates inside the outer tube 10, the first grout holes 11a, 11b, 11c, 11d, 11e and 11f of the outer tube 10 are inserted into the second grout hole 21a, 21b, 21c, 21d and the perforation hole 1 in the depth direction.

6 to 8, the first grout holes 11a, 11b, 11c, 11d, 11e, and 11f spaced in the circumferential direction are six, and the plurality of second grout holes 21a, 21b, 21c and 21d. However, the number of holes may vary depending on the depth of the perforation hole 1, the diameter of the inner tube 20 and the outer tube 10, the type of grout, and the like. The diameters and spacing of the first grout holes 11a, 11b, 11c, 11d, 11e and 11f and the second grout holes 21a, 21b, 21c and 21d, The first and second grout holes may be configured to be selectively and / or stepwise communicated.

Hereinafter, a grouting process by the multi-stage grout injection apparatus according to another embodiment of the present invention will be described in detail.

The outer tube 10 is inserted into the perforation hole 1 of the ground and the inner tube 20 is inserted into the outer tube 10 as shown in Fig. At this time, the inner tube 20 can be inserted into the inside of the outer tube 10 such that the closed end 25 of the inner tube 20 comes close to the closed end 15 of the outer tube 10.

When the inner tube 20 is thus inserted into the outer tube 10, a part of the first first grout hole located at the lowermost side of the outer tube 10 and a portion of the first second grout hole located at the lowermost side of the inner tube 20 communicate with each other . For example, as shown in Fig. 6, some of the first grout holes 11a and 11b among the first first grout holes of the outer tube 10 and some of the second grout holes 21a And 21b can communicate with each other and the grout supplied through the grout cap 30 in this state can communicate with the grout hole 30 communicating with one of the first (lowest) grout holes of the outer tube 10 and the inner tube 20. [ (11a, 11b, 21a, 21b). At this time, by maintaining both the second grout holes and the third grout holes of the outer tube 10 and the inner tube 20 in a closed state, some of the lowermost (first) grout holes of the outer tube 10 and the inner tube 20 The grout hole of the outer tube 10 and the inner tube 20 can be carried out very effectively at the lowermost position.

Thereafter, when the inner pipe 20 is first rotated in a predetermined direction by the moving mechanism 40 as shown in Fig. 7 (refer to the direction of arrow T in Fig. 7), the inner pipe 20 of the second inner grout holes A part of the second grout holes 21c and 21d communicate with the first grout holes 11c and 11d of the second first grout holes of the outer tube 10. [ In this state, the grout supplied through the grout cap 30 passes through the grout holes 11c, 11d, 21c, and 21d communicating with each other in the second grout holes of the outer tube 10 and the inner tube 20, (1). At this time, the first grout holes and the third grout holes of the outer tube 10 and the inner tube 20 are kept closed so that the grout holes of the second grout holes of the outer tube 10 and the inner tube 20 are opened Grout injection can be carried out very effectively at the second position of the outer tube 10 and the inner tube 20.

8, when the inner pipe 20 is rotated in a predetermined direction by the moving mechanism 40, a part of the second grout holes located on the uppermost side of the inner pipe 20, A part of the first grout holes 11e and 11f communicates with the holes 21a and 21b and a part of the third first grout holes located on the uppermost side of the outer tube 10. [ In this state, the grout supplied through the grout cap 30 is partially filled with grout holes 21a, 21b, 11e, and 11f communicating with each other in the uppermost (third) grout hole of the outer tube 10 and the inner tube 20 To the periphery of the perforation hole (1). At this time, by maintaining both the first grout holes and the second grout holes of the outer tube 10 and the inner tube 20 closed, a part of the uppermost (third) grout holes of the outer tube 10 and the inner tube 20 The grout hole of the outer tube 10 and the inner tube 20 can be very effectively advanced at the uppermost (third) position.

As described above, by relatively rotating the inner tube 20 in the outer tube 10, the second grout holes 21a, 21b, 21c, and 21d of the inner tube 20 and the first grout holes 11a and 11b , 11c, 11d, 11e and 11f can be selectively / stepwise communicated. Thus, it is possible to carry out sequential and gradual multi-stage grouting injection from the lower part to the upper part of the perforation hole 1 very easily and accurately, It is possible to realize the grouting method for reinforcing the ground more effectively.

In short, the multi-stage grout injection apparatus of the present invention includes a plurality of first grout holes (11a, 11b, 11c, 11d, 11e, 11f) and a plurality of second grout holes The grout can be injected very uniformly and quickly by selectively or stepwise communicating the grooves 21a, 21b, 21c, and 21d, thereby greatly improving the grouting quality. In addition, the multi-stage grout injection apparatus of the present invention can be easily utilized as a pile method for ground reinforcement or a micro pile method for ground reinforcement in addition to the grouting method for ground reinforcement.

9 to 15 are views showing one embodiment of the moving mechanism 40 of the multi-stage grout injection apparatus according to the present invention.

The moving mechanism 40 includes a first chucking mechanism 50 for chucking or unchucking the upper end of the inner tube 20 and a second chucking mechanism 50 for moving the first chucking mechanism 50 in the longitudinal direction Unit 60 as shown in FIG.

The first chucking mechanism 50 includes a first housing 51 and a plurality of first chucking members 52 for chucking and unchucking the upper end of the inner tube 20 while moving radially in the first housing 51 And a first driving unit for moving the first housing 51 in the longitudinal direction.

The first housing 51 has a cylindrical structure with a space therein. The grouting injection cap 31 is inserted into the upper end of the first housing 51 to inject grouting. The inner circumferential surface of the grouting injection cap 31 can be sealingly engaged with the upper end 26 of the inner tube 20 by a sealing member 34 such as an O-ring.

A first guide block 54 is disposed inside the first housing 51 and a first guide block 54 is installed to be supported by the base 55. The first guide block 54 is formed in an annular shape corresponding to the outer periphery of the inner tube 20 and an inclined guide surface 54a may be formed on the upper surface of the first guide block 54. [

A plurality of first chucking members (52) can be installed in the first housing (51) so as to be movable in the radial direction.

A plurality of first chucking members 52 are connected to the first housing 51 through a guide structure 54 so that a plurality of first chucking members 52 are disposed radially relative to the first housing 51 The movement can be precisely guided.

The plurality of first chucking members 52 are provided so as to be guided with respect to the guide surface 54a of the first guide block 54. Particularly, And has a guide surface 52a corresponding to the guide surface 54a.

The first chucking member 52 is provided with a recessed portion 52b on the inner peripheral surface thereof so that the first chucking member 52 can chuck the inner tube 20 more firmly.

The first driving unit may include a first driving cylinder 58 installed on an outer circumferential surface of the first housing 51.

A fluid space 59 into which the fluid is introduced or discharged is formed in the first drive cylinder 58 and the first housing 51 is disposed in the fluid space 59. As the fluid is introduced into or discharged from the fluid space 59, the first housing 51 is installed to move upward or downward.

A hydraulic fluid connection port 58a is provided at one side of the first drive cylinder 58 and a hydraulic fluid source (not shown) such as an oil pump or an oil tank is connected to the hydraulic connection port 58a.

One or more ports 58b communicating with the fluid space 59 are formed on the inner side of the first drive cylinder 58 and the fluid is introduced into the fluid space 59 through the port 58b, .

Specifically, when the fluid is introduced into the fluid space 59 through the hydraulic connection port 58a, the fluid space 59 as shown in FIG. The first housing 51 can be moved upward by the fluid pushing the first housing 51 upward. On the other hand, when the fluid is discharged from the fluid space 59 through the hydraulic connection port 58a and the port 58b, the fluid level in the fluid space 59 is lowered as shown in Fig. 10 and the first housing 51 It can move down due to its own weight.

As the first housing 51 moves up and down by the first driving unit, the plurality of first chucking members 52 move along the first guide block 54 in the first housing 51 in the inner diameter direction Or in the outer diameter direction.

10, when the first housing 51 moves downward, the plurality of first chucking members 52 can move downward together with the first housing 51, and a plurality of The first chucking member 52 of the first guide block 54 moves in the oblique direction along the guide surface 54a of the first guide block 54 to move in the inner diameter direction toward the inner tube 20, 1 chucking member 52 can chuck the upper end 26 of the inner tube 20.

9, when the first housing 51 moves in the upward direction, the plurality of first chucking members 52 can move upward together with the first housing 51, and the plurality of first chucking members 52, The member 52 is moved in the outer diameter direction from the inner tube 20 by moving in the oblique direction along the guide surface 54a of the first guide block 54 to form a plurality of first chucking members 52 Can unchuck the upper end 26 of the inner tube 20.

The first chucking mechanism 50 may further include at least one first elastic member 53 for applying an elastic force to move the plurality of first chucking members 52 in the unchucking direction.

The first elastic member 53 is installed to connect the plurality of first chucking members 52 in the circumferential direction. In particular, the first elastic member 53 may be made of a material capable of applying an elastic force in a radial direction (and / or a circumferential direction) like a C-type spring. Thus, when the fluid is supplied to the fluid space 59 of the first drive cylinder 58, the first elastic member 53 can apply elastic force to push the plurality of first chucking members 52 outwardly have.

The mobile unit 60 can linearly move or rotate the inner pipe 20 chucked by the first chucking mechanism 50 by linearly moving or rotating the first chucking mechanism 50. [

According to one embodiment, the mobile unit 60 can be configured to linearly move the first chucking mechanism 50 along the longitudinal direction of the inner tube 20, as shown in Figs.

The moving unit 60 has an outer cylinder 61 and a piston 62 which moves up and down as the fluid is introduced into and discharged from the inside of the outer cylinder 61.

A fluid space 63 through which the fluid is introduced or discharged is formed in the outer cylinder 61. A hydraulic connection port 61a is provided at one side of the outer cylinder 61. An oil pump or oil A hydraulic fluid source (not shown), such as a tank, is connected to the hose.

One or more ports 61b communicating with the fluid space 63 are formed on the inner side of the outer cylinder 61 and the fluid is introduced into the fluid space 63 through the port 61b or from the fluid space 63 Can be discharged. The outer cylinder 61 is installed to be supported by the support plate 80.

The piston member 62 is installed to move upward or downward as the fluid in the fluid space 63 is introduced or discharged and the upper end surface of the piston member 62 is connected to the base 55 of the first chucking mechanism 50 As shown in Fig. 11, when the piston member 62 moves upward, the inner tube 20 chucked by the first chucking mechanism 50 and the first chucking mechanism 50 can linearly move upward together As shown in FIG. 10, when the piston member 62 moves downward, the inner tube 20 chucked by the first chucking mechanism 50 and the first chucking mechanism 50 can be linearly moved downward together.

According to another embodiment, the moving unit 60 may be constituted by a rotating cylinder which rotates the first chucking mechanism 50 in the circumferential direction. When the movable unit 60 is constituted by a rotary cylinder, the movable unit 60 rotates the base 55 of the first chucking mechanism 50 or the first drive cylinder 58 in a predetermined rotational direction The inner tube 20 can be rotated in the circumferential direction inside the outer tube 10 as shown in Figs.

The moving mechanism 40 according to the present invention can move the inner tube 20 linearly or rotate in the inside of the outer tube 10 by using a mechanism capable of chucking the outer tube 10 2 chucking mechanism 70 as shown in FIG.

The second chucking mechanism 70 includes a second housing 71 and a plurality of second chucking members (not shown) that chuck and unchuck the upper end 16 of the outer tube 10 while radially moving within the second housing 71 72 for moving the second housing 71 in the longitudinal direction, and a second driving unit for moving the second housing 71 in the longitudinal direction.

The second housing 71 has a cylindrical structure having a space therein and the second guide block 74 is disposed inside the second housing 71. A flange portion 71a is formed at the upper end edge of the second housing 71. [

The second guide block 74 may be formed in an annular shape corresponding to the outer periphery of the outer tube 10 and an inclined guide surface 74a may be formed on the upper surface of the second guide block 74. The second guide block 74 may be fixed to the bottom surface of the support plate 80.

The plurality of second chucking members 72 may be installed movably in the second housing 71 in the radial direction.

The plurality of second chucking members 72 are connected to the second housing 71 through the guide structure 74 so that the plurality of second chucking members 72 are arranged radially with respect to the second housing 71 The movement can be precisely guided.

The plurality of second chucking members 72 are provided so as to be guided with respect to the guide surface 74a of the second guide block 74. Particularly, And has a guide surface 72a corresponding to the guide surface 74a.

The second driving unit may include a second driving cylinder 78 installed on the outer circumferential surface of the second housing 71.

A fluid space 79 through which fluid is introduced or discharged is formed in the second drive cylinder 78 and a second housing 71 is disposed within the fluid space 79. As the fluid is introduced into or discharged from the fluid space 79, the second housing 71 is installed to move upward or downward.

A hydraulic fluid connection port 78a is provided at one side of the second drive cylinder 78 and a hydraulic fluid source (not shown) such as an oil pump or an oil tank is connected to the hydraulic connection port 78a.

One or more ports 78b communicating with the fluid space 79 are formed on the inner side of the second drive cylinder 78 and the fluid is introduced into the fluid space 79 through the port 78b, .

Specifically, when the fluid is introduced into the fluid space 79 through the hydraulic connection port 78a, the fluid space 59, as shown in FIG. 10, The second housing 71 can be moved upward by the fluid pushing the flange portion 71a of the second housing 71 upward. On the other hand, when the fluid is discharged from the fluid space 79 through the hydraulic connection port 78a and the port 78b, the fluid level in the fluid space 79 is lowered as shown in Fig. 9 and the second housing 71 It can move down due to its own weight.

When the second housing 71 is moved up and down by the second driving unit as described above, the plurality of second chucking members 72 ride on the second guide block 74 in the second housing 71, It can move in the inner or outer diameter direction.

10, when the second housing 71 moves in the upward direction, the plurality of second chucking members 72 can move upward together with the second housing 71, and a plurality of The second chucking member 72 of the second guide block 74 moves in the oblique direction along the guide surface 74a of the second guide block 74 to move in the inner diameter direction toward the outer tube 10, The two chucking members 72 can chuck the upper end 16 of the outer tube 10.

9, when the second housing 71 moves downward, the plurality of second chucking members 72 can move downward together with the second housing 71, and the plurality of second chucking members 72 The member 72 is moved in the outer diameter direction from the outer tube 10 by moving in the oblique direction along the guide surface 74a of the second guide block 74 so that a plurality of second chucking members 72 Can unchuck the upper end 16 of the outer tube 10.

The second chucking mechanism 70 may further include at least one second elastic member 73 for applying an elastic force to move the plurality of second chucking members 72 in the unchucking direction.

The second elastic member 73 is installed to connect the plurality of second chucking members 72 in the circumferential direction. In particular, the second elastic member 73 may be made of a material capable of applying an elastic force in a radial direction (and / or a circumferential direction) like a C-type spring. Therefore, when fluid is supplied to the fluid space 79 of the second drive cylinder 78, the second elastic member 73 can apply elastic force to push the plurality of second chucking members 72 in the outer diameter direction have.

As such, various embodiments of the present invention can be applied to the first grout hole of the inner tube 20 and the first grout hole of the outer tube 10 by relatively moving (or rotating) the inner tube 20 relative to the outer tube 10. [ The multistage grout injection operation can be performed more quickly and stably by communicating stepwise (or selectively).

As described above, the various embodiments of the present invention may be configured to relatively move (or rotate) the inner tube 20 relative to the outer tube 10, (Or rotate) the inner tube 20 relative to the inner tube 20.

Figure 16 is a diagram illustrating a multi-stage grout injection method in accordance with various embodiments of the present invention.

As described above, the perforation hole 1 is formed in the ground, and the outer pipe 10 is inserted into the perforation hole 1 (S1).

After the outer tube 10 is installed, the inner tube 20 is inserted into the outer tube 10 (S2).

Thereafter, the grout is injected while gradually moving (or selectively) the first grout hole of the outer tube 10 and the second grout hole of the inner tube 20 while moving either the outer tube 10 or the inner tube 20, (S3).

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: Appearance 11, 12, 13: First grout ball
11a, 11b, 11c, 11d, 11e, 11f: first grout ball
20: inner circumference injection pipe 21, 22, 23: second grout ball
21a, 21b, 21c, 21d: a second grout ball
30: grout injection cap 40: moving mechanism

Claims

An outer appearance having a plurality of first grout holes;
An inner pipe extending in the longitudinal direction and movably inserted into the inside of the outer pipe, the inner pipe having a plurality of second grout holes; And
And a moving mechanism for moving the inner tube,
The moving mechanism includes a first chucking mechanism having a plurality of first chucking members chucking the upper end of the inner tube, a moving unit moving the first chucking mechanism, and a second chucking mechanism chucking the upper end of the outer tube In addition,
The upper end of the inner pipe projects upward from the upper end of the outer pipe, the grouting cap is installed at the upper end of the inner pipe,
Wherein at least a portion of the first grout hole of the plurality of first grout holes is configured to communicate stepwise and selectively with at least a portion of the second grout hole as the inner pipe moves by the moving mechanism Features multi-stage grouting system.

The method according to claim 1,
Wherein the moving mechanism is configured to linearly move the inner tube along the longitudinal direction.

The method according to claim 1,
Wherein the moving mechanism is configured to rotate the inner tube in the circumferential direction.

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A multi-stage grout injection method using a multi-stage grout injection apparatus according to claim 1,
An outer appearance installation step of inserting the outer pipe into the perforation hole of the ground;
An inner tube mounting step of inserting the inner tube into the outer tube; And
And moving at least one of the outer tube and the inner tube to inject grout while communicating at least a part of the first grout hole and at least a part of the inner tube of the inner tube with the second grout hole.