KR100553175B1 - Method for creating improved ground and apparatus for the same - Google Patents

Abstract

It is an object of the present invention to provide a method for forming a ground improvement that enables high-quality construction in a large size, shortens the construction time, and reduces cost.

In the ground improvement composition method of inserting an injection tube into a target ground to inject a hardening material at high pressure, and mixing the hardening material into the ground to form an underground composition, the support body is freely installed at the lower end of the injection tube to freely rotate the holding body. Install the injection nozzle moving in the sliding direction in the tangential direction of the injection pipe, insert the injection pipe, and spray the hardening material from the injection nozzle at high pressure while moving the injection nozzle position by sliding the injection nozzle in the horizontal state. The ground improvement composition method which extracts an injection tube and forms the underground composition which mixed the hardening | curing material in the ground was used.

In the ground improvement composition method of inserting an injection tube into an object ground to inject a hardening material at high pressure, and mixing the hardening material into the ground to form an underground composition, the tip member is made swingable at the lower end of the injection tube. In the tangential direction of the injection tube, spray holes were provided in the tangential direction of the injection pipe, the hardened material was sprayed from the spray hole at high pressure while the tip member was rocked, and the hardened material was mixed in the target ground to form the ground composition.

 Injection pipe, Retainer, Injection nozzle, Housing, Hydraulic cylinder, Piston rod, Inlet pipe, Piston, Moving body, Ground

Description

Ground improvement method and ground improvement method {METHOD FOR CREATING IMPROVED GROUND AND APPARATUS FOR THE SAME}

1 is a schematic diagram showing an outline of an injection tube of the present invention;

2 is a schematic diagram showing an outline of the injection tube and the holder according to the present invention;

3 is a schematic diagram showing the relationship between the holder and the jet nozzle of the present invention;

4 is a schematic diagram showing an outline of an injection tube of the present invention;

5 is a schematic diagram showing an outline of the injection tube and the holder according to the present invention;

6 is a view for explaining the ground improvement composition method of the present invention,

6A is a schematic diagram showing a state in which an injection tube is installed upright;

6B is a schematic view of a state in which the holder is horizontal with respect to the injection tube;

Figure 6c is a perspective schematic diagram of the composition of the underground composition by spraying the hardening material, and

6D is a schematic plan view of a state in which the underground composition is continuously installed;

Figure 7 is a perspective view of a specific embodiment of the injection tube and the four-pillar-shaped cured material mixing layer formed therein used in the four-pillar-shaped curing material mixing method of the present invention,

8 is a longitudinal sectional view in which cutting holes are provided in the ground;

9 is a longitudinal sectional view of the injection tube inserted;

10 is a longitudinal sectional view showing a state in which the injection pipe starts to swing upward;

11 is a longitudinal sectional view showing a state in which the tip member swings upward;

12 is a longitudinal sectional view showing a state where the injection tube is pulled upward;

13 is a longitudinal sectional view showing a state in which the tip member starts to swing downward; and

Fig. 14 is a perspective view showing a control panel which drills and installs a plurality of nozzles in the tip member and controls the opening of the nozzle hole;

(Explanation of symbols for the main parts of the drawing)

1: injection tube 2: holder

3: injection nozzle 11: housing

12: sliding cylinder 13: hydraulic cylinder

14: cutting edge 15: piston rod

16: introduction tube 17: piston

18 packing 21 injection tube

22: holder 23: injection nozzle

24: moving body 25: hose

101: injection tube 102: tip member

103: blowout hole 111: ground

112: cutting hole 121: nozzle

122: hole 123: control panel

The present invention relates to a ground improvement composition method for inserting an injection tube into a target ground and spraying the hardening material at high pressure to mix the hardening material in the ground to form an underground composition. The underground composition is constructed for the purpose of stabilization of soft ground, foundation of construction mall, support of jisan, continuous wall of underground parking lot or basement, bottom plate or underground dam, and ground liquefaction by earthquake. It is also effective as a countermeasure.

As a ground improvement method of inserting an injection tube into a conventional target ground, injecting a hardening material at a high pressure to mix the hardening material, and forming a ground composition, there is a CCP method, a JSG method, or a CJG method. In either method, the hardening material was injected at a high pressure from the injection nozzle at the lower end of the injection pipe while rotating the injection pipe to form a cylindrical hardening material mixing layer.

When the continuous wall is to be formed by the cylindrical cured material mixing method, the cylindrical cured material mixing layer must be overlapped and formed. The arc part inside and outside of the wall thickness became wasteful construction with the part which overlapped in the wall, and was inefficient.

Moreover, according to the columnar hardening material mixing method, it was not possible to control the distance reached by spraying hardening material from the nozzle to the ground, and it was impossible to accurately adjust the thickness of the continuous wall.

Moreover, according to the cylindrical hardening material mixing method, since spraying radially from a nozzle centering on an injection pipe, injection efficiency was bad, the construction time was long, and construction efficiency was not said to be good either.

In addition, since the foundation work in the narrow place where the house was built cannot control the distance that the hardened material reaches from the nozzle to the ground, it often affects the adjacent area, and construction in the narrow place was difficult.

As a method for improving the cylindrical cured material incorporation method, a tetragonal cured material injection method has been proposed.

The conventional method for forming the underground composition is a structure in which a high pressure injection of the hardening material from the injection nozzle at the lower end of the injection pipe while forming the cylindrical hardened material mixture layer while forming a cylindrical range of ground, while improving the ground in a certain range. In addition, since the overlapping part and the composition unnecessary part are also formed in order to line up the cylinder-shaped hardening material mixing layer, the construction cost is comparatively high and it is unsuitable for extensive ground improvement.

In the case of forming the underground composition, the conventional method of forming the underground composition was not economical because waste of overlapping portions and unnecessary composition portions at the time of connection was very large.

For this reason, the formation method of the underground wall which can construct a wide range of improvement and the liquefaction prevention underground wall at low cost is anticipated and desired.

Moreover, the rotational movement toward the top or the bottom of the tip member is driven by a suitable means such as a hydraulic cylinder, and even if the top or bottom side of the tip member is in contact with the soil, the tip may not be sufficiently cut. There is a problem that the rotational movement of the member does not work smoothly, and the hardening material is not efficiently mixed.

In view of the above circumstances, the present invention improves the composition quality of the underground composite, enables the enlargement, shortens the construction time, and reduces the cost, and inserts an injection tube into the target ground to spray the hardened material at high pressure. In the ground improvement composition method of mixing the hardening material in the ground to form the underground composition, the holding body (member at the lower end of the injection pipe, the member having the function of spraying the hardening material) at the lower end of the injection tube is rotated freely Install the injection nozzle in the tangential direction of the injection tube, and insert the injection tube, and slide the injection nozzle in the horizontal state to move the injection nozzle position to move the injection nozzle position. It is a ground improvement composition method that sprays the nozzle at high pressure, extracts the injection pipe, and forms an underground composition in which hardening material is mixed into the ground. The.

In addition, the present invention is to improve the composition quality of the underground composition, to increase the size, to shorten the construction time, and to insert the injection pipe into the target ground to reduce the cost to spray the hardening material at high pressure to harden the ground material In the ground improvement composition method of forming the underground composition by mixing the mixture, the retainer is freely installed at the lower end of the injection tube, the injection nozzle is installed at the tip of the holder in the tangential direction of the injection tube, and the injection tube is inserted. Then, the retarder is moved to the left and right by moving the spray nozzle to the left and right in the horizontal state, and the hardened material is sprayed at a high pressure from the spray nozzle while extracting the injection pipe to form the ground composition in which the hardened material is mixed into the ground. It was set as the composition method.

Moreover, in this invention, the cutting body was provided with the cutting edge in order to make the movement of a holding body easy.

In addition, the present invention, by inserting an injection tube into the target ground and spraying the hardening material at high pressure to improve the composition quality of the underground composition, to increase the size, to shorten the construction work, and to reduce the cost In the ground improvement composition method of mixing the hardening material into the ground composition, the tip member is swingable at the lower end of the injection tube, and the injection holes are provided in the tangential direction of the injection tube at both ends of the tip member. A ground improvement composition method was used in which a hardened material was sprayed at a high pressure from an injection hole while the member was shaken to mix a hardened material in a target ground to form an underground composition.

In addition, the present invention is to pivot the tip member to the lower end of the injection tube in order to smoothly rotate the tip member by cutting the portion abutting the upper and lower soils of the tip member to facilitate the rotational movement and the mixing of the hardened material to be efficient In the ground improvement composition method of forming a subsurface composition by providing spray holes at both ends of the tip member and spraying the hardener at high pressure from the spray hole while rocking the tip member back and forth or from side to side to mix the hardener in the ground. When the tip member oscillates, the ground improvement composition method is such that the fluid is ejected from the side facing the soil of the tip member to cut the soil.

In the present invention, specifically, the fluid is ejected from one of the upper and lower surfaces of the tip member or from the side surfaces of both sides.

In addition, the present invention is specifically defined as a ground improvement composition method in which the fluid is compressed air / high pressure water.

In addition, according to the present invention, after cutting, asphalt or a hardening material is injected to form a wall.

In addition, the present invention is specifically a ground improvement composition method in which the flow rate and pressure of the ejection of a fluid are kept substantially constant.

Moreover, this invention is a ground improvement composition method which used the front-end member as a storage tank of a fluid specifically, in order to remove the influence of the slight fluctuation of the flow volume and pressure of a fluid.

In addition, the present invention, by cutting the portion in contact with the upper and lower earth and sand of the front end member, to smoothly rotate the front end member and to efficiently inject the hardener injection, the front end member is pivoted freely in the lower end of the injection tube In the ground improvement composition apparatus which forms a subsurface composition by attaching the injection hole to the tip of the tip member, and spraying the hardened material from the injection hole at high pressure while rocking the tip member back and forth or from side to side. When the tip member oscillates, the ground improvement composition device is provided by drilling a nozzle for ejecting a fluid on the side facing the soil of the tip member.

In addition, the present invention specifically eliminates the influence of minute fluctuations in the flow rate and pressure of the fluid by using the tip member as the storage tank of the fluid.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Based on drawing attached to this invention, it demonstrates in detail below.

In FIG. 1, the holding body 22 is provided in the lower part of the injection pipe 21 at the rotational movement freely.

This holding body 22 rotates the holding body 22 by the hydraulic cylinder, the wire, or the chain accommodated in the injection pipe 21, and makes it horizontal as shown in FIG. Supply of hardening materials, such as cement milk, to the injection nozzle is performed by the hose 25 extended from the lower end of the injection pipe 21. As shown in FIG.

As shown in FIG. 3, the movable body 24 is provided with a sliding free path on the holding body 22, and the injection nozzles 23 face the tangential direction of the injection pipe 21.

This movable body 24 slides the holding body 22, and injects the hardening | curing material toward the ground from the injection nozzle 23 at high pressure. The movable body 24 is moved from one end of the holding body 22 to the other end, and the injection tube 21 is pulled out slightly to stop. Similarly, when the moving body 24 is moved from one end to the other end, an underground composition in which a hardening material is incorporated into the ground is formed. .

Moreover, in the apparatus used for the ground improvement composition method of this invention, as shown in FIG. 4, the holding body 2 is provided in the lower end part of the injection pipe 1 freely in rotational movement, and is attached to the front-end | tip of the holding body 2; The injection nozzle 3 is installed toward the tangential direction of the injection pipe 1. The rotational movement of the holding body 2 with respect to the injection pipe 1 is performed using a hydraulic pipe or the like accommodated in the injection pipe 1.

As shown in FIG. 5, the holder 2 has a sliding cylinder 12 having a spray nozzle 3 at its tip in the housing 11 and a hydraulic cylinder for driving the sliding cylinder 12. Accepts 13.

The cutting edge 14 is fixed to the distal end surface of the sliding cylinder 12, and the sliding cylinder 12 is fixed to the distal end of the piston rod 15 of the hydraulic cylinder 13. As the piston rod 15 expands and contracts, the sliding cylinder 12 and the spray nozzle 3 are freely moved forward and backward. In the housing 11, hardening | curing material C, such as cement milk, is guide | induced by the introduction tube 16. As shown in FIG. Reference numeral 17 is a piston, 18 is a packing.

Here, the hardening | curing material C is guide | induced into the housing | casing 11 from the introduction pipe 16, and the hardening | curing material C is inject | poured in the ground from the injection nozzle 3 at high pressure. The injection direction of the hardening | curing material C is the tangential direction of the injection pipe 1, and is injected toward the front direction and the rear direction from the surface shown. In addition, when the piston rod 15 of the hydraulic cylinder 13 is retracted, the surface into which the hardening | curing material C was mixed in the ground is formed. When the piston rod 15 reaches the end, the injection pipe 1 is rotated 180 degrees, and when the same operation is performed, the surface on which the hardening material C is mixed in the ground is formed on both sides of the injection pipe 1. Thereafter, the injection tube 1 is taken out step by step and the hardened material C is sprayed to form the underground composition W. FIG. When forming the long underground composition, the underground composition W may be formed adjacent to the formed underground composition W again. When the injection pipe 1 rises, the ground is cut by the cutting edge 14 and the rise of the holding body 2 is facilitated.

In the above description, the example in which the injection nozzle 3 is provided at one end of the holder 2 has been described, but it may be provided at both ends of the holder. Moreover, the same thing as the above can be installed at the opposite side simultaneously.

The composition method of the underground composition of the present invention will be described in more detail.

First, as shown in FIG. 6A, the underground pipe 1 is installed on the target ground. In this case, depending on the ground, there may be a case where the injection pipe 1 is installed upright after the hole is installed in advance, and the injection pipe 1 may be immediately installed on the ground.

Next, as shown in FIG. 6B, the holding body 2 is set horizontal to the injection pipe 1.

Subsequently, as shown in FIG. 6C, the hardened material C is sprayed toward the ground from the injection nozzle 3, the injection pipe 1 is pulled out in steps, and the underground composition in which the hardened | cured material C was mixed in the ground ( W) is formed.

In addition, when the underground composition W is lined up, as shown as a top view in FIG. 6D, the injection pipe 1 is pulled out, the underground pipe 1 is inserted in the mutually adjacent place, and the underground composition W is attached. Form and install continuously.

First, a method for mixing a four-pillar-shaped cured material will be described.

As shown in Fig. 7, the proximal end of the tip member 102 is pivotally attached to the lower end of the injection tube 101 for injecting hardening material such as cement milk into the ground, and the tip member 102 is hydraulically applied. It is made to rock by appropriate means, such as a cylinder, and the injection hole 103 is arrange | positioned toward the tangential direction of the injection pipe 101 on both sides of the front-end | tip of the front-end member 102. As shown in FIG. The hardened | cured material which reached | attained the injection hole 103 of the front-end member 102 through the injection pipe 101 is sprayed to the ground by high pressure of about 200-600 kgf / cm <2>.

First, as shown in FIG. 8, the cutting hole 112 is provided in the target ground 111 to the required depth by suitable means, such as a boring machine or an earth auger.

Next, as shown in FIG. 9, the injection tube 101 is inserted into the cutting hole 112 with the tip member 102 in a drooping state.

Subsequently, as shown in FIG. 10, hardening materials, such as high pressure cement milk, are injected from the injection hole 103 of the front end member 102 of the injection pipe 101 by rotating the front end member 102 upwards. do. The tip member 102 is rocked while injecting the hardening material from the injection hole 103. The reach of the hardened material is about 1 to 3 m in the soft ground at a pressure of 400 kgf / cm 2, and about 1 m at a soft pressure of 600 kgf / cm 2.

The state where the front-end member 102 rocked is the state shown in FIG. This completes the injection of the first step. In addition, although the injection of hardening | curing material may be the injection of only hardening | curing material only, it may spray in conjunction with compressed air.

When the injection is completed in the state of FIG. 11, the tip member 102 is horizontal from the drooping state while injecting the hardening material from the injection hole 103 of the tip member 102, so that it is rectangular in view in plan view with a constant thickness. A quadrangular pillar-shaped hardener incorporation layer shown as V ₁ at 7 is formed. If four column shape settable material mixed layer (V ₁₎ is not sufficient to injection of one time of the settable material it may be injected at the same ground to the two-settable material.

Next, as shown in FIG. 12, the inlet tube 101 is raised about 4 cm, for example, with the front-end member 102 in the drooping state. This raises the step of injection.

The injection pipe 101 is stepped up to swing the tip member 102 upward from the state of FIG. 13 to continue spraying the cured material from the injection hole 103 to a horizontal state or an angle designated by the tip member 102. Then, as shown in the same manner as Figure 7, it is a composition of four rectangular column-like mixed settable material layer (V _2).

In the same manner, the injection pipe 101 is stepped up to the required height to form a quadrangular pillar-shaped cured material mixing layer V.

In the case of arranging the four-pillar-shaped cured material mixture layers in the left and right directions, the four-pillar-shaped cured material mixture layers are formed in the same position adjacent to each other in the four-pillar-shaped cured material mixture layer and continuously provided.

In the above example, the hardening material mixing layer is described as an example of the vertical wall, but is not limited to this, and is applied to the bottom plate of the horizontal wall, and also to the inclined cylinder housing the escalator or the like. have.

In addition, although the tip member 102 is provided in one side of the injection pipe 101 in the example of illustration, you may provide in both sides as needed.

Rotational movement upward or downward of the tip member 102 is driven by a suitable means such as a hydraulic cylinder, and the upper or lower side of the tip member 102 comes in contact with the soil, but the soil may not be sufficiently cut. have.

Thus, in the present invention, the fluid is ejected from the upper side and the lower side of the tip member 102 in contact with the earth and sand of the front end member 102, so that the ground sand of the part can be cut and the rotational movement of the front end member 102 can be performed smoothly. To be efficient.

The present invention is a method for cutting soil, also referred to as a soil cutter or earth cutter, and also incorporates a hardening material into the soil.

Conventionally, as a method of cutting soil, a method of using a chain saw or a wire or the like has been considered. Any of these can be made at a shallow position from the ground, and it is difficult to apply it in a deep underground even in relation to the mechanism.

The present invention is to enable the cutting, processing of the soil by a remote operation deep in the ground.

The tip member 102 is shown in FIG. A nozzle 121 for ejecting compressed air or high pressure water is installed at an appropriate interval on the upper side of the front end member 102. The fluid ejected from the nozzle 121 may be only compressed air, high pressure water, or a combination of compressed air and high pressure water.

When a certain amount of fluid is injected from the plurality of nozzles 121, the pressure decreases as the number of nozzles 121 increases. In order to prevent this, the control panel 123 is moved to limit the number of nozzles 121 from which the fluid is ejected, so that the pressure and flow rate of the ejected fluid are kept constant. A control panel 123 having a plurality of holes 122 drilled so as to have different injection times is freely installed on the side surface of the front end member 102 by an hydraulic cylinder or the like in the axial direction. Moreover, although not shown about the lower side, it can install in the same way.

The spraying order and the spraying time are adjusted in accordance with the moving direction of the control panel 123.

By using the tip member 102 as a storage tank for the fluid, the fluid flows into the tip member 102 and stays for about 0.5 seconds, and then discharges, thereby eliminating the influence of minute fluctuations in the flow rate and pressure of the fluid, It is possible to eject a stable fluid.

Moreover, the present invention is applied not only to the tetragonal cured material mixing method, but also to the cylindrical cured material mixing method.

In the above example, the control panel is provided with the sliding free movement on the outer circumferential surface of the distal end member, but the control panel may be freely provided on the inner circumferential surface of the distal end member.

In the present invention, although there is a time difference with respect to a large area for injecting the hardening material, the pressure and flow rate of the fluid to be used can be constant.

In addition, according to the present invention, by changing the moving speed and the moving section of the control panel, it is possible to cut a specific place mainly.

In addition, the present invention has an effect of promoting the discharge of the waste mud and at the same time to promote the cutting of the adjacent soil by the flow velocity when the direction of the nozzle is upward, can be reused to cut the waste mud which becomes unnecessary. .

Moreover, this invention can also use together a chain saw, a wire, etc. In this case, a further effect can be expected.

Moreover, in this invention, when asphalt or hardened | cured material is inject | poured after a cutting | disconnection, it can form a reliable water supply wall or underground wall, even if it does not spray high pressure.

In the above example, an example in which the tip member is rotated in a predetermined direction at the lower end of the injection tube has been described. However, a plurality of tip members may be connected, and the connecting portion may be connected by a universal tongue joint.

In addition, the present invention can be applied not only to the quadrangular cured material mixing method but also to the cylindrical mixing method.

As described above, in the ground improvement composition method of inserting an injection tube into a target ground to inject a hardened material at high pressure and mixing the hardened material into the ground to form an underground composition, the holding body is rotated at the lower end of the injection tube. The spray nozzle is installed freely in the movement, and the spray nozzle which moves the retaining body in the sliding direction is installed in the tangential direction of the injection pipe, and after inserting the injection pipe, the spraying body is moved by sliding the spray nozzle in the horizontal state to move the spray nozzle position. Is a ground improvement composition method of spraying the injection tube at high pressure and extracting the injection tube to form the underground composition in which hardening material is mixed into the ground. Therefore, the composition quality of the underground composition can be improved, and the construction can be enlarged. The cost can be reduced by reducing the man-hour.

In addition, the present invention, in the ground improvement composition method of inserting the injection pipe into the target ground to spray the hardening material at high pressure and mixing the hardening material into the ground to form the underground composition, the holding body is freely installed in the lower end of the injection pipe The injection nozzle is installed at the tip of the holding body in the tangential direction of the injection pipe, and after the injection pipe is inserted, the holding material is moved from the injection nozzle to the high pressure while moving the injection nozzle position by moving the injection nozzle to the left and right in a horizontal state. Since it is a ground improvement composition method of forming the underground composition which sprays, extracts an injection pipe, and mixes hardening | curing material in the ground, the width | variety of a underground composition can be formed correctly.

In addition, in the present invention, instead of the oscillating motion, the holding body is moved back and forth in a straight state, and the injection nozzle moves at a constant speed, so that the composition quality of the underground composition is improved.

In addition, in the present invention, the movement of the holding body is also a linear motion, the configuration thereof is simple, the size can be increased, the construction time can be shortened, and the cost can be reduced.

Moreover, in this invention, since the cutting edge is provided in the holding body, the cutting for moving a holding body can be ensured beforehand.

Further, in the present invention, as described above, the tip member pivotally attaches the tip member to the lower end of the injection tube, and spray holes are provided on both sides of the tip member of the tip member, and the cured material is injected to the front and rear or left and right, and the hardened material is injected into the injection hole. In the ground improvement composition method of forming a ground composite by injecting a hardening material into the ground by spraying at a high pressure in the ground, the ground improvement composition which causes the soil to be cut by ejecting a fluid from the side of the tip member which comes into contact with the soil when the tip member swings. Since the method, the parts contacting the upper and lower soils of the front end member is cut to smoothly rotate the front end member, and the hardened material can be efficiently mixed.

According to the present invention, in the ground improvement composition method of inserting an injection tube into a target ground to inject a hardening material at a high pressure, and mixing the hardening material into the ground to form an underground composition, the front end member can be swingable at the lower end of the injection tube. It is a ground improvement composition method that installs injection holes in the tangential direction of the injection pipe at both ends of the tip member, and sprays the hardened material through the injection hole at high pressure while rocking the tip member to mix the hardener in the target ground to form an underground composition. In addition, the cost can be reduced by improving the composition quality of the underground composite, enabling the enlargement, and reducing the construction time.

In addition, in the present invention, the fluid is ejected from either side of the upper and lower sides of the tip member, so that the part contacting the upper and lower soils of the tip member is cut and the rotational movement of the tip member is performed smoothly, and the hardening material is mixed efficiently. It could be.

Moreover, since this invention mixes asphalt and hardened | cured material after a cutting, and forms a wall, it can form a wall easily in the ground.

In addition, the present invention, since the fluid is compressed air / high pressure water hardening material injection method, the upper and lower parts of the front end member in contact with the earth and sand is cut to smoothly rotate the end member, the mixing of the hardening material can be efficiently It was made.

In addition, the present invention is to maintain a substantially constant flow rate and pressure of the ejection of the fluid, so that the portion of the front end member in contact with the earth and sand of the lower end portion is cut to perform the rotational movement of the front end member smoothly, the mixing of the hardening material becomes efficient To make it possible.

Furthermore, in the present invention, since the tip member is used as the storage tank for the fluid, the influence of the slight fluctuations in the flow rate and pressure of the fluid is eliminated, so that the stable fluid is ejected.

In addition, the present invention, the tip member is pivotally attached to the lower end of the injection tube, and the injection hole is provided at the tip of the tip member, and the hardened material is injected from the injection hole at high pressure while rocking the tip member back and forth or from side to side to the ground. In the ground improvement composition apparatus which mixes hardening material and forms an underground composition, it was made into the ground improvement composition apparatus which installed the nozzle which ejects the fluid to the side which touches the soil of the front end member at the time of rocking of the front end member. The parts contacting the upper and lower soils of the member were cut, the rotational movement of the tip member was smoothly performed, and the mixing of hardeners was made efficient.

In addition, in the present invention, the tip member can be used as a storage tank for the fluid, thereby eliminating the influence of the slight fluctuations in the flow rate and pressure of the fluid, thereby enabling a stable ejection of the fluid.

Claims (17)

delete delete delete In the ground improvement composition method of inserting an injection tube into the target ground and spraying the hardening material at high pressure and mixing the hardening material in the ground to form an underground composition, The tip member is allowed to oscillate at the lower end of the injection tube, and spray holes are provided in the tangential direction of the injection tube on both sides of the tip end of the injection member. A ground improvement composition method comprising mixing to form an underground composition. The tip member is pivotally attached to the lower end of the injection tube, and spray holes are installed at both ends of the tip member, and the hardened material is injected from the spray hole at high pressure while the tip member is swung back and forth or left and right to mix the hardened material in the ground. In the ground improvement composition method for forming the underground composition, And a ground improvement composition for cutting soil by ejecting a fluid from a side facing the soil of the tip member when the tip member swings. The ground improvement composition method according to claim 5, wherein the fluid is ejected from the upper and lower sides of the tip member or from both side surfaces thereof. The method of claim 5 or 6, wherein the fluid is compressed air / high pressure water. The ground improvement composition method according to claim 5 or 6, wherein asphalt or hardening material is injected after cutting to form walls without ejecting the hardening material. The ground improvement composition method according to claim 5 or 6, wherein the flow rate and pressure of the ejection of the fluid are kept substantially constant. The ground improvement composition method according to claim 5 or 6, wherein a tip member is used as a storage tank of the fluid so as to eliminate the influence of the minute fluctuations in the flow rate and pressure of the fluid. The tip member is pivotally attached to the lower end of the injection tube, and the injection hole is installed at the tip of the tip member. In the ground improvement composition device for forming a composition, The ground improvement composition device characterized in that the nozzle for ejecting the fluid is installed in the side that is in contact with the soil of the tip member when the tip member is rocked. The ground improvement composition apparatus according to claim 11, wherein the tip member is used as a storage tank of the fluid. The ground improvement composition method according to claim 7, wherein a wall is formed by injecting asphalt or hardening material after cutting without ejecting the hardening material. 8. The method of claim 7, wherein the flow rate and pressure of the jet of the fluid are kept substantially constant. 8. The method of claim 7, wherein the tip member is used as a storage tank for the fluid so as to eliminate the influence of the slight fluctuations in the flow rate and pressure of the fluid. 10. The method according to claim 8, wherein the tip member is used as a storage tank of the fluid so as to eliminate the influence of the slight fluctuations in the flow rate and pressure of the fluid. 10. The method according to claim 9, wherein the tip member is used as a storage tank for the fluid so as to eliminate the influence of the slight fluctuations in the flow rate and pressure of the fluid.

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