WO2008120948A1

WO2008120948A1 - Grouting apparatus and grouting method using the same

Info

Publication number: WO2008120948A1
Application number: PCT/KR2008/001839
Authority: WO
Inventors: Ki Pyo Jeon
Original assignee: Ki Pyo Jeon
Priority date: 2007-04-02
Filing date: 2008-04-02
Publication date: 2008-10-09
Also published as: CN101663441B; CN101663441A; KR100842924B1; JP2010523850A; JP4527809B2

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 kinds of substances, an injection pipe which is connected to the leading end device to supply the filler material, and an extending hose which is connected to the injection pipe to supply the filler material. The injection pipe is characterized in that: (1) it is formed by plurality of pipe segments which are formed to a predetermined length and are combined in series detachably with each other, (2) the shape after the pipe segments are combined is a single line of pipe as a whole. The extending hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a length corresponding to the pipe segments and combined in series detachably with each other, (2) the shape after the hose segments are combined is a single line of hose as a whole, (3) plurality of supply hoses for supplying the plurality kinds of material substances respectively are connected to the opposite end portion of the side to which the injection pipe is connected, and (4) the total length of the extending hose after joining the hose segments is increased by as much as the total length of the injection pipe after the pipe segments are combined is decreased.

Description

GROUTING APPARATUS AND GROUTING METHOD USING

THE SAME

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 injection pressure of injection line according to the change of depth is not varied, by the length of extending hoses being extended to correspond to the length of the injection pipe that decreases according to each injection step, during the injection work of grouting filler material into the ground for reinforcement and water shielding of weak ground in civil engineering. 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 for a certain time period to reinforce weak ground or to prevent subsidence of the structure built on weak ground.

[3] Such a grouting method has been disclosed in prior art in various forms. Of those, the LW (Labiles Wasserglass) method uses a process of penetrating filler material (grout material) 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 an LW method described above, there are a 1 shot method and 1.5 shot method according to the grout injecting process.

[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, there are some drawbacks. Fisrt, injection is impossible while cement is precipitating. Second, gel time is too long as 30-60 minutes to be used as a rapidly congealing type. Third, it is difficult to adjust gel time. Forth, 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. Then, these solutions of different properties are supplied into an injection pipe connected to the Y tube to be mixed, and filler material is injected into the ground through a penetrated hole formed below portion of the injection pipe.

[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 1.5 shot method using the conventional Manchette tube, the Manchette tube

2a is manufactured by forming plurality of injection holes A on the outer circumference of the tube body, and attaching a rubber sleeve 5 around the injection holes.

[11] Next, this Manchette tube 2 is inserted in a casing (not shown) inserted into the ground. 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 pipe 1 with two packers 3a and 3b fitted separately 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 is maintained sealed 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 the injected pressurized water pushes out the rubber sleeve 5 that blocks the injection holes A as the pressure of the space portion rises. This destroys the sealing material 4 formed on the outer circumference of the Manchette tube 2, so as to form passages for filler material to spray into in the subsequent steps.

[15] Next, filler material is injected into the injection pipe 1 inserted into the Manchette tube 2, and the injected filler material is sprayed into the ground through passages formed by the sealing material 4 destroyed in the previous step, so as to form grouting areas.

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

[17] However, the 1.5 shot method using such a conventional 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 short according to the change of grout injection location. And there is another problem of difficulty in injection of filler material especially when the injection area of the Manchette tube and packing position of the double packers are not corresponding.

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

[19] On the other hand, since the conventional Manchette tube has a tube made of rubber material, the 1.5 shot method using the Manchette tube has a problem that it is difficult to secure a uniform grouting area by the deformation (bending 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 during work on soft ground, since the Manchette tube is deformed by the pressure of the ground, there is a problem that injection is not smooth.

[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. But the Manchette tube made of rubber material is weak against such a high pressure. According to this, in the case of grouting work with the depth deep, there is a problem that it is not easily applied. 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 the total length of injection line is maintained constant regardless of each injection step during grouting work, so that the injection pressure regardless of the filler material injection location is constant. 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 kinds of substances, an injection pipe which is connected to the leading end device to supply the filler material, and an extending hose which is connected to the injection pipe to supply the filler material, wherein said injection pipe is characterized in that: (1) it is formed by plurality of pipe segments which are formed to a predetermined length and are combined in series detachably with each other, and (2) the shape after said pipe segments are combined is a single line of pipe as a whole, and said extending hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a length corresponding to said pipe segments and combined in series detachably with each other, (2) the shape after said hose segments are combined is a single line of hose as a whole, (3) plurality of supply hoses for supplying said plurality kinds of material substances respectively are connected to the opposite end portion of the side to which said injection pipe is connected, and (4) the total length of said extending hose after joining the hose segments is increased by as much as the total length of said injection pipe after the pipe segments are combined is decreased.

[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 hose segments that are to be located on the ground in series respectively to form an extending hose, and connecting pipe segments that are to be located underground in series respectively to form an injection pipe, and then inserting said injection pipe and the leading end device connected to this into said casing; (3) drawing out said casing; (4) connecting said extending hose to said injection pipe in series and connecting plurality of supply hoses to said extending hose; and (5) 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 pipe segment exposed above the ground accordingly, and additionally connecting the hose segment as much as the length of said separated pipe segment.

Advantageous Effects

[24] According to the grouting apparatus and the grouting method using the same, the length of extending hoses is extended to correspond to the length of the injection pipe that decreases according to each injection step 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 getting deep as well as that the ground is firmly reinforced by inducing a grouting area of constant width to form on the ground. Brief Description of the Drawings

[25] 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 drawings:

[26] 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;

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

[28] 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; [29] 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; [30] Fig. 5 is a schematic view showing the process for inserting the extending hose of the grouting apparatus according to the embodiment of the present invention; [31] 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; [32] Fig. 7 is a schematic view showing the state of taking apart the third pipe segment of the grouting apparatus according to an embodiment of the present invention; [33] Fig. 8 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; [34] Fig. 9 is a schematic view showing the state of taking apart the second pipe segment of the grouting apparatus according to an embodiment of the present invention; and [35] Fig. 10 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.

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

[37] 10: leading end device 12: inner tube

[38] 14: outer tube 16: open tip

[39] 20a: first pipe segment 20b: second pipe segment

[40] 20c: third pipe segment 25: elbow

[41] 30a: first hose segment 30b: second hose segment

[42] 30c: third hose segment 40: filler material mixing device

[43] 42: housing pipe 44: fixing bar

[44] 45, 46, 47: side rings 48: middle ring

[45] 50a, 50b: supply hose 60: casing

Best Mode for Carrying Out the Invention [46] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. [47] 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. [48] As shown in Fig. 2, the grouting apparatus according to an embodiment of the present invention comprises a leading end device 10 for spraying filler material into the ground, an injection pipe 20 which is connected to an upper end of the leading end device 10 to supply filler material to the leading end device 10, and an extending hose 30 connected to the topmost end of the injection pipe 20 with supply hoses 50a and 50 b connected to the extending hose 30 to supply cement liquid and water glass liquid. Above mentioned 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 of course.

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

[50] In the drawings accompanying the present invention, an example comprising three pipe 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.

[51] Meanwhile, to the third pipe segment 20c is joined the extending hose 30 through an elbow 25. The extending hose 30 is made by continuous connection of 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 pipe segments through coupling or screw joining so as to be detachable from each other.

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

[53] 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 outward.

[54] Also, screw thread may be formed in the end portion of the leading end device 10 to which the injection pipe is connected, so as to make connection and detachment to the injection pipe 20 easy.

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

[56] As an example, as shown in Fig. 4, the filler material mixing device 40 may consist of an housing pipe 42, a middle ring 48 which is housed in the housing pipe 42 and has a hole with a predetermined diameter inside, side rings 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 fixed between the middle ring 48 and side rings.

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

[58] Also, the fixing bars 44 may be fixed on the the middle ring 48 and the side rings in inclined manner along the axis direction respectively. Namely, each may be formed in a shape bent along the axis direction so as to have a shape similar to a conventional screw.

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

[60] Fig. 5 is a schematic view showing the process for inserting the injection pipe 20 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 taking apart the third pipe segment of the grouting apparatus according to an embodiment of the present invention, Fig. 8 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, Fig. 9 is a schematic view showing the state of taking apart the second pipe segment of the grouting apparatus according to an embodiment of the present invention, and Fig. 10 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.

[61] 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:

[62] 1) First, bore the ground and insert a casing 60. (A casing inserting step)

[63] 2) Mount the leading end device 10 to the first pipe segment 20a, and mount in series the second pipe segment 20b and the third pipe segment 20c continuously to the first pipe segment 20a according to the depth to be inserted and insert the whole into the casing 60. (Injection pipe connection step)

[64] 3) Draw away the casing 60 that is inserted into the ground. (Casing drawing step)

[65] 4) Connect the first hose segment 30a to the third pipe segment 20c located above the ground through the elbow 25, and connect to it the supply hoses 50a and 50b through the filler material mixing device 40. (Injection preparation step)

[66] 5) Spurt filler material to the lowest portion underground to carry out grouting.

(First injection step: Sl)

[67] 6) When the first injection step is completed, elevate the location of the leading end device 10 upward to move the filler material injection location underground, and take apart the third pipe segment 20c exposed above the ground. (First segment taking-apart step)

[68] 7) In order to replenish the total length to the length of the third pipe segment 20c taken apart, connect further (possibly through the elbow 25) the second hose segment 30b between the second pipe segment 20b and the first hose segment 30a, and inject filler material. (Second injection step: S2)

[69] 8) When the second injection step is completed, elevate the location of the leading end device 10 upward to move the filler material injection location underground, and take apart the second pipe segment 20b exposed above the ground in the same manner as the aforementioned first segment taking-apart step. (Second segment taking-apart step)

[70] 9) In order to replenish the total length to the length of the second pipe segment 20b taken apart, connect further (possibly through the elbow 25) the third hose segment 30c between the first pipe segment 20a and the second hose segment 30b, and inject filler material. (Third injection step: S3)

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

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

[73] First, by connecting hose segments so as to correspond to the length disappeared from the injection pipe 20 for supplying filler material, it is possible to maintain the total length of filler material injection line identical all the time.

[74] Accordingly, the pressure of filler material sprayed from the leading end device 10 is made to have a constant pressure in any location underground, which prevents the ground from being elevated or settled partially by unstable spray pressure when filler material is sprayed.

[75] Also, since uniform spraying of filler material is possible throughout the whole ground, a grouting area of constant width is formed in the ground. This makes stable reinforcement of ground which makes stable grouting possible even if the depth of the grouting area gets deep.

[76] Second, the filler material mixing device 40 connected between the supply hoses

50a and 50b and the extending hose 30 induces easy mixture of supplied cement liquid and water glass liquid and acts to supply filler material in well mixed condition to the extending hose 30.

[77] That is, the filler material mixing device 40 makes liquids of different properties flow in simultaneously and passes them through the middle ring 48 and side rings 45, 46 and 47 formed inside, so as to induce eddy action of the fluids to be mixed well with each other.

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

[79] Third, the leading end device 10 consists of double tube of the inner tube 12 and the outer tube 14, and it is in a state with the open tip 16 closed if injection of filler material is not made as shown in Fig. 3 (A). But, on the contrary, if filler material is supplied through the injection pipe 20, the filler material is flowed into the inner tube 12 of the leading end device 10 and is flowed out through the spray holes formed in the inner tube 12, to fill space between the inner tube 12 and outer tube 14.

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

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

[82] Accordingly to this, the leading end device 10 of the present invention acts to prevent elevation of ground and local damage of the grouting area that are caused by structural impact to the ground, which have been the problem caused by spraying filler material into the ground at a high pressure with the conventional front device consisted of a single tube.

[83] Although the present invention has been described in connection with 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 claims. Industrial Applicability

[84] The present invention may be used in a grouting apparatus and a grouting method using the same, in construction field.

Claims

[1] A grouting apparatus comprising a leading end device which injects into the ground the filler material made by mixing plurality kinds of substances, an injection pipe which is connected to the leading end device to supply the filler material, and an extending hose which is connected to the injection pipe to supply the filler material, wherein said injection pipe is characterized in that: (1) it is formed by plurality of pipe segments which are formed to a predetermined length and are combined in series detachably with each other, and (2) the shape after said pipe segments are combined is a single line of pipe as a whole, and said extending hose is characterized in that: (1) it is formed by plurality of hose segments which are formed to a length corresponding to said pipe segments and combined in series detachably with each other, (2) the shape after said hose segments are combined is a single line of hose as a whole, (3) plurality of supply hoses for supplying said plurality kinds of material substances respectively are connected to the opposite end portion of the side to which said injection pipe is connected, and (4) the total length of said extending hose after joining the hose segments is increased by as much as the total length of said injection pipe after the pipe segments are combined is decreased.

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

[3] The grouting apparatus of claim 2, wherein said filler material mixing device comprises an housing pipe; a middle ring which is housed in 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 manner 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 which has 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 ground and inserting a casing;

(2) connecting hose segments that are to be located above the ground in series respectively to form an extending hose, and connecting pipe segments that are to be located underground in series respectively to form an injection pipe, and then inserting said injection pipe and the leading end device connected to this into said casing;

(3) drawing out said casing;

(4) connecting said extending hose to said injection pipe in series and connecting plurality of supply hoses to said extending hose; and

(5) 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 pipe segment exposed above the ground accordingly, and additionally connecting the hose segment as much as the length of said separated pipe segment.