WO2008123674A1

WO2008123674A1 - Grouting apparatus and grouting method

Info

Publication number: WO2008123674A1
Application number: PCT/KR2008/001838
Authority: WO
Inventors: Ki Pyo Jeon
Original assignee: Ki Pyo Jeon
Priority date: 2007-04-05
Filing date: 2008-04-02
Publication date: 2008-10-16
Also published as: KR100842925B1

Abstract

The present invention relates to a grouting apparatus and a grouting method using the same for grouting filler material into the ground for the purpose of reinforcement and water shielding of weak ground in civil engineering work. The grouting apparatus comprises a leading end device which injects into the ground the filler material made by mixing plurality of kinds of substances, an injection hose which is connected to the leading end device to supply the filler material, and a housing pipe which is connected to the leading end device while enclosing the outer circumference of the injection hose. The injection hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a predetermined length and are combined in series detachably with each other, (2) the total length after the hose segments are combined is maintained constant until grouting is ended, (3) the shape after the hose segments are combined is a single line of hose as a whole, and (4) to the opposite end portion of the side where the leading end device is installed are connected plurality of supply hoses for supplying the plurality of kinds of substances respectively. The housing pipe is characterized in that: (1) it is formed by plurality of housing segments which are formed to a length corresponding to the hose segments and combined in series detachably with each other, (2) the housing segment is made in a monolithically formed pipe shape, and is installed with the injection hose housed beforehand so that a location can be moved in a shape penetrated by the injection hose.

Description

GROUTING APPARATUS AND GROUTING METHOD

Technical Field

[1] The present invention relates to a grouting apparatus and a grouting method using the same, more specifically to a grouting apparatus and a grouting method using the same whereby the grouting pressure of a grouting line is prevented from changing according to the change of depth as well as grouting of filler material can be made continuously during the work of grouting filler material into the ground for reinforcement and water shielding of weak ground in civil engineering work. Background Art

[2] In general, a grouting method is a method for reinforcing the bearing capacity of ground by making holes in settled ground and filling with fluid grout material such as cement slurry or liquid chemicals and then congealing the grout material for a certain time period to reinforce weak ground or prevent subsidence of the structure built on weak ground.

[3] Such a grouting method has been disclosed in conventional art in various forms. Of those, the LW (Labiles Wasserglass) method uses a process of penetrating filler material (grout) of special properties into the ground to improve the ground characteristics to suit to the purpose of use. This refers to a method wherein water glass liquid (sodium silicate) and a small quantity of cement are mixed well, and after a given time period has passed for cement to precipitate, liquid floating on cement is injected into the ground.

[4] In such an LW method, there are a 1 shot method and 1.5 shot method according to the grout injecting manner.

[5] In the 1 shot method, diluted water glass liquid and a small quantity of cement are mixed, and after a predetermined time period has passed, liquid floating on cement is injected into the ground.

[6] But in such a process of injecting by the 1 shot method, although it is rational in theory and has a good penetration effect, injection is not possible while cement is precipitating, and it cannot be used as a rapidly congealing type since gel time is as long as 30-60 minutes. Also, it is difficult to adjust gel time, and there is a drawback that material is wasted since only liquid floating on cement but cement is injected.

[7] To complement such a drawback, the 1.5 shot method was disclosed. In the 1.5 shot method, cement liquid and water glass liquid are sent to a Y tube at the same pressure and the same quantity through separate pumps, these solutions of different properties are supplied into an injection tube connected to the Y tube in mixed state, and filler material is injected into the ground through a penetrated hole formed therebelow.

[8] As a representative example using such a 1.5 shot method, there is a grouting method using a Manchette tube, which will be described briefly below.

[9] Fig. 1 is a partial sectional view showing the state in which a Manchette tube applied to the conventional grouting work is inserted into the ground.

[10] In the conventional 1.5 shot method using the Manchette tube, plurality of injection holes A are formed on the outer circumference of the tube body, and a rubber sleeve 5 is attached around these injection holes A to manufacture the Manchette tube 2.

[11] Next, this Manchette tube 2 is inserted in a casing (not shown) that is inserted into the ground, and after injecting sealing material 4 between the Manchette tube 2 and the casing, the casing is drawn out to be removed.

[12] Subsequently, an injection tube 1 that has two packers 3a and 3b fitted separatedly at a predetermined interval is inserted into the Manchette tube 2, and pressurized water is injected beginning with a desired location.

[13] At this time, a given space of the Manchette tube 2 has a sealed state maintained by the packers 3a and 3b, as shown in Fig. 1.

[14] Accordingly, pressurized water is injected into the sealed space portion of the

Manchette tube 2, and as the pressure in the space portion rises, the injected pressurized water pushes out the rubber sleeve 5 that blocks the injection holes A to destroy the sealing material 4 formed along the outer circumference of the Manchette tube 2, to form passages for filler material to spray out in the subsequent steps.

[15] Next, filler material is injected into the injection tube 1 that is inserted into the

Manchette tube 2, and the injected filler material is sprayed into the ground through passages formed at the sealing material 4 destroyed in the previous step, to form grouting areas.

[16] By repeating such a series of processes into the ground according to location, grouting work for the ground is accomplished.

[17] However, the conventional 1.5 shot method using such a Manchette tube has a problem in that it is difficult to maintain grout injection pressure constant because the total length of injection line gets longer or shorter according to the change of grout injection location, and in that continuous grouting work is impossible since the injection line exposed above the ground has to be cut out and connection of new grout supply line is needed.

[18] Another problem is that it is difficult to ensure structural stability in the whole grout ing area, since the grouting area where grout is injected at high pressure has the ground elevated and the grouting area where grout is injected at relatively low pressure has the ground partially settled as the deviation range of injection pressure increases like this.

[19] On the other hand, the conventional 1.5 shot method using the Manchette tube has the Manchette tube made of a tube of rubber material, and it has a problem that it is difficult to secure a uniform grouting area, as the Manchette tube is deformed (bent to one side of inclination) during injection of filler material in the case of inclined construction for constructing on an inclination of the ground. Especially there is a problem that injection is not easy during work on soft ground, since the Manchette tube is deformed by the pressure of the ground.

[20] Moreover, in the case of grouting work in a place with a deep underground depth, the filler material injection pressure increases as much as the deepened depth. And there is a problem that it is not easily applied in the case of grouting work with a deep depth since the Manchette tube made of rubber material do not have strength against such a high pressure.

Disclosure of Invention Technical Problem

[21] The present invention is to solve the aforementioned problems with the conventional art with an object to provide a grouting apparatus and a grouting method using the same whereby construction is accomplished with an identical spray pressure by maintaining the whole length of injection line constant regardless of each injection step as well as continuous injection of filler material is possible. Technical Solution

[22] To achieve the above object, there is provided a grouting apparatus of the present invention comprising a leading end device which injects into the ground the filler material made by mixing plurality of kinds of substances, an injection hose which is connected to the leading end device to supply the filler material, and a housing pipe which is connected to the leading end device while enclosing the outer circumference of the injection hose, wherein said injection hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a predetermined length and are combined in series detachably with each other, (2) the total length after said hose segments are combined is maintained constant until grouting is ended, (3) the shape after said hose segments are combined is a single line of hose as a whole, and (4) to the opposite end portion of the side where said leading end device is installed are connected plurality of supply hoses for supplying said plurality of kinds of substances respectively, and said housing pipe is characterized in that: (1) it is formed by plurality of housing segments which are formed to a length corresponding to said hose segments and combined in series detachably with each other, and (2) said housing segment is made in a monolithically formed pipe shape, and is installed with said injection hose housed beforehand so that a location can be moved in a shape penetrated by said injection hose. [23] In addition, to achieve the above object, there is provided a grouting method of the present invention using the grouting apparatus described above, comprising the steps of: (1) boring a ground and inserting a casing; (2) connecting a hose segment to one end of a leading end device in such a way that fluid can be communicated, and after connecting the housing segment to said leading end device with said hose segment housed, connecting the remaining hose segments and housing segments to be located underground in series respectively and inserting them into said casing; (3) drawing out said casing; (4) connecting the last hose segment to the hose segment nearest to the ground in series and connecting plurality of supply hoses to said last hose segment; and (5) injecting filler material continuously while repeating the process of moving the location of said leading end device upward step by step to move the filler material injection location underground, separating said housing segment exposed above the ground, and moving said housing segment with said hose segment housed.

Advantageous Effects

[24] According to the grouting apparatus and the grouting method using the same, the injection hose maintains an identical length all the time during injection of filler material, so it is possible to maintain injection pressure constant regardless of injection location, and there is an effect that stable grouting work is possible even if the depth of the grouting area is deep as well as that the ground is firmly reinforced by inducing formation of a grouting area of constant width in the ground.

[25] Another effect is that the construction period can be shortened since continuous injection of filler material is possible without the need of separating the injection hose when the injection location is to be changed. Brief Description of the Drawings

[26] These and other objects, features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description, taken in conjunction with the accompanying drawings. In giving reference numbers to the components of the drawings, it is to be noted that the identical components are marked with identical numbers even if they are illustrated in a different drawing. In the drawings:

[27] Fig. 1 is a partial sectional view showing the state in which a Manchette tube that is applied to the conventional grouting is inserted into the ground;

[28] Fig. 2 is a schematic view showing the configuration of a grouting apparatus according to an embodiment of the present invention;

[29] Fig. 3 is a sectional view showing a leading end device which is one component of the grouting apparatus according to the embodiment of the present invention;

[30] Fig. 4 is a perspective view showing a filler material mixing device which is one component of the grouting apparatus according to the embodiment of the present invention;

[31] Fig. 5 is a schematic view showing the process for inserting the injection hose of the grouting apparatus according to the embodiment of the present invention;

[32] Fig. 6 is a schematic view showing the state of performing a first grouting injection step of the grouting apparatus according to the embodiment of the present invention;

[33] Fig. 7 is a schematic view showing the state of performing a second grouting injection step of the grouting apparatus according to the embodiment of the present invention; and

[34] Fig. 8 is a schematic view showing the state of performing a third grouting injection step of the grouting apparatus according to the embodiment of the present invention.

[35] * Description of Symbols of the Major Parts of the Drawings *

[36] 10: leading end device 12: inner tube

[37] 14: outer tube 16: open tip

[38] 20a: first housing segment 20b: second housing segment

[39] 20c: third housing segment 30a: first hose segment

[40] 30b: second hose segment 30c: third hose segment

[41] 40: filler material mixing device 42: housing pipe

[42] 44: fixing bar 45, 46, 47: side rings

[43] 48: middle ring 50a, 50b: supply hose

[44] 60: casing

Best Mode for Carrying Out the Invention

[45] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[46] Fig. 2 is a schematic view showing the configuration of a grouting apparatus according to an embodiment of the present invention, Fig. 3 is a sectional view showing a leading end device which is one component of the grouting apparatus according to the embodiment of the present invention, and Fig. 4 is a perspective view showing a filler material mixing device which is one component of the grouting apparatus according to the embodiment of the present invention.

[47] As shown in Fig. 2, the grouting apparatus according to the embodiment of the present invention comprises a leading end device 10 for spraying filler material into ground, a housing pipe 20 detachably connected to the leading end device 10, an injection hose 30 which is inserted into the housing pipe 20 and one end of which is connected so as to be fluid-communicated to the leading end device 10, and supply hoses 50a and 50b which are connected to the other end of the injection hose 30 so as to supply cement liquid and water glass liquid respectively. Cement liquid and water glass liquid are just one example of substances that will be materials of filler material for grouting, and a combination of other substances may as well be used.

[48] The housing pipe 20, as shown in Fig. 2, comprises a first housing segment 20a connected to the leading end device 10, a second housing segment 20b connected to the first housing segment, and a third housing segment 20c connected to the second housing segment, wherein these segments can be detachably connected in series with each other by screws for joining.

[49] In the drawings of the present invention, an example comprising three housing segments 20a, 20b and 20c is shown, but it is a matter of course that the number of these segments may be properly adjusted to be used according to the depth of ground.

[50] The injection hose 30 comprises a first hose segment 30a, a second hose segment 30b and, a third hose segment 30c having lengths corresponding to the above-mentioned plurality of housing segments 20a, 20b and 20c, and these segments are connected in series to each other detachably. And each of the hose segments 30a, 30b and 30c may be connected by conventional coupling or a screw joining method as shown partially enlarged in Fig. 2.

[51] As shown in Fig. 3, the leading end device 10 may include an inner tube 12 with plurality of spray holes penetrated on the outer circumference thereof with one end thereof closed, and an outer tube 14 in which the inner tube 12 is housed and has plurality of open tips 16 formed on the outer circumference thereof so as to be opened outward by internal pressure. Here, the open tip 16 may have various shapes such as polygon or circle, etc.

[52] In other words, the leading end device 10 may consist of a double pipe of the inner tube 12 and the outer tube 14 that can spray filler material.

[53] Also, on the end portion the leading end device 10 to which the injection hose of is connected, screw thread may be formed so as to make it easy to connect and separate with respect to the housing pipe 20.

[54] Meanwhile, in the above-mentioned configuration, the injection hose 30 may be connected to supply hoses 50a and 50b through a filler material mixing device 40.

[55] In this case, as shown in Fig. 4, the filler material mixing device 40 may consist of a housing pipe 42, a middle ring 48 which is housed in a middle portion of the housing pipe 42 and has a hole with a predetermined diameter inside, side rings 45, 46 and 47 arrayed at a predetermined interval so as to have diameters gradually decreasing in both directions from the middle ring 48, and plurality of fixing bars 44 connected between the middle ring 48 and side rings 45, 46 and 47.

[56] Here, side rings may consist of a plurality such as a first side ring 45, second side rin g 46, and third side ring 47 that are formed so as to have different diameters respectively, and each may be connected to be fixed by fixing bars 44 along the axis direction X.

[57] Also, the fixing bars 44 may be fixed in inclination along the axis direction respectively on the outer circumferences of the middle ring 48 and the side rings 45, 46 and 47. Namely, each may be formed in a shape bent along the axis direction so as to have a shape similar to a conventional screw.

[58] Hereinafter, the grouting method using the grouting apparatus of the present invention having the above-mentioned configuration will be described with reference to the drawings.

[59] Fig. 5 is a schematic view showing the process for inserting the injection hose of the grouting apparatus according to the embodiment of the present invention, Fig. 6 is a schematic view showing the state of performing a first grouting injection step of the grouting apparatus according to the embodiment of the present invention, Fig. 7 is a schematic view showing the state of performing a second grouting injection step of the grouting apparatus according to the embodiment of the present invention, and Fig. 8 is a schematic view showing the state of performing a third grouting injection step of the grouting apparatus according to the embodiment of the present invention.

[60] As shown in the drawings, the grouting method using the grouting apparatus according to an embodiment of the present invention consists of the following sequence:

[61] 1) Bore the ground to form a boring rod and insert a casing 60 into the boring rod. (A casing inserting step)

[62] 2) Connect one end of the first hose segment 30a to the inner tube 12 of the leading end device 10 in such a way that it can be fluid-communicated thereto. Subsequently, insert the first hose segment 30a into the first housing segment 20a, and combine the first housing segment 20a to the leading end device 10. (Hereinafter, calls assembly of injection leading end portion.)

[63] 3) When the assembly of injection leading end portion is completed, insert the injection leading end portion into the casing 60, and at the same time, connect the second hose segment 30b to the first hose segment 30a of the injection leading end portion and connect the second housing segment 20b to the first housing segment 20a respectively in such way that the second hose segment 30b is housed.

[64] Namely, connect each section continuously with the hose segments 30a and 30b inserted into the housing segments 20a and 20b respectively.

[65] In this manner, connect the remaining the third housing segment 20c and the third hose segment 30a according to the depth of the ground and insert them into the casing 60.

[66] 4) Draw out and separate the casing 60 that is inserted into the ground.

[67] 5) Connect supply hoses 50a and 50b to the third hose segment 30c (or a fourth hose segment 3Od connected and communicated to this) located on the ground through the filler material mixing device 40.

[68] 6) Spurt filler material to the lowest portion underground to carry out grouting.

(Hereinafter, first injection step: Sl)

[69] 7) When the first injection step is completed, inject filler material while elevating the location of the leading end device 10 upward to move up the underground filler material injection location. At this time, unfasten the third housing segment 20c exposed above the ground to separate it from the second housing segment 20b. (Hereinafter, housing segment separation step).

[70] The separated third housing segment 20c is located on the ground while housing the injection hose 30 exposed above the ground, and injection of filler material is done continuously. (Hereinafter, second injection step: S2).

[71] 8) Separate the second housing segment 20b in the same manner as the above- mentioned housing segment separation step, and elevate the location of the leading end device 10 one step higher and inject filler material. (Third injection step: S3)

[72] In this manner, grouting can be completed by increasing or decreasing the injection steps according to the depth bored into the ground.

[73] Meanwhile, in case where a part of the injection hose 30 is clogged or one of the housing segments 20a, 20b and 20c are to be separated as necessary during work, grouting may as well be done after each hose segment 30a, 30b and 30c is separated, each housing segment 20a, 20b and 20c is drawn out, and then each hose segment 30a, 30b and 30c is connected again in the aforementioned housing segment separation step.

[74] Hereinafter, operation and effects of the grouting apparatus of the present invention and the grouting method using the same will be described.

[75] First, continuous injection is possible without the need of separating the injection hose 30 during injection of filler material.

[76] That is, in conventional art, the supply hose had to be separated for a certain time period before being connected again to the injection tube in order to remove part of the injection tube exposed above the ground as the injection location of filler material is elevated. But in the present invention, the housing segment 20a, 20b and 20c exposed above the ground during injection of filler material is unfastened and located on the ground with the injection hose 30 still housed thereinside, which makes continuous injection of filler material possible.

[77] Second, the injection hose 30 for supplying filler material has a total length identical all the time even if the injection location of filler material is changed, which makes it possible to maintain the spray pressure of filler material constant.

[78] That is, the pressure of filler material sprayed out of the leading end device 10 is to be constant in any location underground, which prevents the ground from being elevated or being settled partially due to unstable spray pressure.

[79] Also, stable reinforcement of ground can be expected by forming a grouting area of constant width on the ground since uniform spraying of filler material is possible throughout the ground, which makes stable grouting possible even if the depth of the grouting area deepens.

[80] Third, the filler material mixing device 40 connected between the supply hoses 50a and 50b and the injection hose 30 acts to induce cement liquid and water glass liquid supplied to be mixed easily and supply filler material in mixed condition to the injection hose 30.

[81] That is, the filler material mixing device 40 makes liquids of different properties be flowed into simultaneously and pass through the middle ring 48 and side rings 45, 46 and 47 formed inside, to induce the fluids to be mixed with each other well by eddy action.

[82] In order to induce such a mixing action more easily, it is preferable the fixing bars 44 that join the rings together are connected in inclination (in screw shape) along the axis direction X.

[83] Fourth, the leading end device 10 consisting of the inner tube 12 and the outer tube

14 is in a state with the open tip 16 closed as shown in Fig. 3 (A) if injection of filler material is not made. On the contrary, if filler material is supplied through the injection hose 30, the filler material is flowed into the inner tube 12 of the leading end device 10 first and is flowed out through the spray holes formed on the inner tube 12 to fill space between the inner tube 12 and outer tube 14.

[84] Subsequently, when this space is filled with filler material to make the inside pressure rise, the open tip 16 formed on the outer tube 14 is opened to spray filler material into the ground as shown in Fig. 3 (B).

[85] Namely, stable injection becomes possible since it is prevented as much as possible that structural impact is applied to the ground by maintaining the pressure of filler material sprayed by the leading end device 10 low.

[86] Accordingly, the present invention prevents elevation of ground and local damage of the grouting area from being happened, which were caused by structural impact to the ground by spraying filler material into the ground at a high pressure with the conventional front device that consisted of a single tube.

[87] Although the present invention has been described in connection with the exemplary embodiments illustrated in the drawings, it is only illustrative. It will be understood by those skilled in the art that various modifications and equivalents can be made to the present invention. Therefore, the true technical scope of the present invention should be defined by the appended claims. Industrial Applicability

[88] The present invention is applicable to a grouting apparatus and a grouting method using the same.

Claims

Claims [1] A grouting apparatus comprising a leading end device which injects into the ground the filler material made by mixing plurality of kinds of substances, an injection hose which is connected to the leading end device to supply the filler material, and a housing pipe which is connected to the leading end device while enclosing the outer circumference of the injection hose, wherein said injection hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a predetermined length and are combined in series detachably with each other; (2) the total length after said hose segments are combined is maintained constant until grouting is ended; (3) the shape after said hose segments are combined is a single line of hose as a whole; and (4) to the opposite end portion of the side where said leading end device is installed are connected plurality of supply hoses for supplying said plurality of kinds of substances respectively; and said housing pipe is characterized in that:

(1) it is formed by plurality of housing segments which are formed to a length corresponding to said hose segments and combined in series detachably with each other; and

(2) said housing segment is made in a monolithically formed pipe shape, and is installed with said injection hose housed beforehand so that a location can be moved in a shape penetrated by said injection hose.

[2] The grouting apparatus of claim 1, further comprising a filler material mixing device for mixing plurality of materials connected between said injection hose and said supply hose.

[3] The grouting apparatus of claim 2, wherein said filler material mixing device comprises a housing pipe; a middle ring which is housed in a middle portion of said housing pipe and has a hole with a predetermined diameter inside; plurality of side rings arrayed at a predetermined interval so as to have diameters gradually decreasing in both directions from said middle ring; and plurality of fixing bars connected between said middle ring and side rings.

[4] The grouting apparatus of claim 3, wherein said fixing bars are fixed respectively to said middle ring and side rings in inclination to the concentric axis of said middle ring and side rings.

[5] The grouting apparatus of claim 1, wherein said leading end device comprises an inner tube which has plurality of spray holes penetrated on the outer circumference thereof and whose front end is closed; and an outer tube in which said inner tube is housed and having plurality of open tips formed on the outer circumference thereof so as to be opened outward by the internal pressure of said filler material that is pressure-adjusted and mixed by said inner tube.

[6] A grouting method using the grouting apparatus described in any one of claims 1 to 5, comprising the steps of:

(1) boring a ground and inserting a casing;

(2) connecting a hose segment to one end of a leading end device in such a way that fluid can be communicated, and after connecting the housing segment to said leading end device with said hose segment housed, connecting the remaining hose segments and housing segments to be located underground in series respectively and inserting them into said casing;

(3) drawing out said casing;

(4) connecting the last hose segment to the hose segment nearest to the ground surface in series and connecting plurality of supply hoses to said last hose segment; and

(5) injecting filler material continuously while repeating the process of moving the location of said leading end device upward step by step to move the filler material injection location underground, separating said housing segment exposed above the ground, and moving said housing segment with said hose segment housed.