KR100623058B1 - Feeding device of agent for reinforcing foundation - Google Patents

Abstract

The present invention relates to an apparatus for injecting soil reinforcement, in order to inject a ground reinforcement by performing a drilling operation on the soft ground, a plurality of through-holes are formed through the outer circumferential surface at regular intervals along the longitudinal direction, and a tape is attached to cover the through-holes. In the ground reinforcing agent injection device is inserted into the reinforcement pipe buried in the ground and discharged from the distal end portion, the ground reinforcement injector, which is inserted into the reinforcement pipe, is injected into the reinforcement pipe, one of the feeding As the discharge port, the inlet pipe through which the ground hardener is discharged; An outer pipe formed around the outer circumferential surface of the injection pipe to form a space portion, and having an injection hole for injecting one of the feeding and finishing materials into an upper side thereof; A mixing part mounted on a lower side flow path of the injection pipe and having a plurality of inflow holes formed along an outer circumferential surface thereof so as to mix rapid and final materials introduced from the injection pipe and the outer pipe; A backflow prevention means built in the upper portion of the mixing part to prevent a backflow of the supply and completion material to the upper side of the injection pipe; And fixing means mounted to the injection pipe on the lower side of the outer pipe and being in close contact with the inner circumferential surface of the reinforcement pipe while being compressed by the lowering of the outer pipe to prevent leakage of the flow and supply and finalization of the injection pipe. As a technical gist of the present invention, it is possible to prevent groundwater subsidence and efficient blockage of groundwater introduced after perforation into a soft ground, as well as to a ground reinforcement injection device that enables post maintenance by reinjecting a ground reinforcing agent.

Soil reinforcement, injection pipe, outer pipe, mixing part, backflow prevention means, fixing means

Description

Feeding device of agent for reinforcing foundation}

1 is a cross-sectional conceptual view showing the overall configuration and embodiment of the ground strengthening agent injection device according to the present invention

2 is a conceptual diagram showing an embodiment of the construction of the ground reinforcing agent injection device according to the present invention

* Description of the symbols for the main parts of the drawings *

100 ... Injection pipe 200 ... Outer pipe

300 ... Mixing unit 400 ... Reflow prevention means

500 ... Fixing means

The present invention relates to an apparatus for injecting soil reinforcement, and in order to inject soil reinforcement by performing a drilling operation on the soft ground, perforation in the soft ground by adopting the configuration of the injection pipe, the outer pipe, the mixing portion, the backflow prevention means and the fixing means The present invention relates to a ground reinforcement injection device that can prevent the groundwater flowing into the ground and prevent ground subsidence, as well as post-repair by reinjecting the ground reinforcement agent.

In general, in the construction of drilling grounds such as tunnels, railways, subways, etc., the most important thing to keep in mind when drilling and constructing soft grounds is the order construction and ground subsidence for blocking water veins of groundwater in the ground. It can be said to be due to ground collapse.

From the above point of view, and the like, such as the 'direct drilling steel pipe reinforced multi-stage grouting construction method and direct drilling device' of Patent Publication No. 0166423, and the 'growing tip device' of No. 20-298778 for registration Many are known and are used in practice.

The prior art rotates and is equipped with a bit for drilling the ground at the end of the pipe connected to a plurality of to perform the drilling operation, the ground reinforcement is injected into the surrounding ground through the pipe.

However, the prior art of the above-described configuration is that after the completion of the injection of the ground reinforcement after the completion of the repair construction itself injecting the ground reinforcement in the state in which the perforated site is clogged even if there are leaks and signs of ground subsidence There is a fatal drawback of being impossible.

In addition, in areas where vertical loads such as railroads and subways repeatedly occur, there is a possibility of collapse again due to weathering and erosion after a long time due to the absence of a structure serving as a frame to withstand the load of the vehicle.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a ground strengthening agent injection device that can prevent the ground block and ground subsidence of the groundwater flowing into the soft ground.

In addition, the present invention is to provide a ground strengthening agent injection device to enable post-repair by re-injecting the ground strengthening agent.

The present invention for achieving the above object, a plurality of through-holes are formed through the outer circumferential surface at a predetermined interval along the longitudinal direction is inserted into the reinforcement pipe buried in the ground attached to the tape to cover the through-hole discharged from the tip portion In the ground reinforcement injector for injecting ground reinforcement which is a mixture of the finished material, which is inserted into the reinforcement pipe, one of the feed, the finalization material is injected through the injection port is discharged into the discharge port; An outer pipe formed around the outer circumferential surface of the injection pipe to form a space portion, and having an injection hole for injecting one of the feeding and finishing materials into an upper side thereof; A mixing part mounted on a lower side flow path of the injection pipe and having a plurality of inflow holes formed along an outer circumferential surface thereof so as to mix rapid and final materials introduced from the injection pipe and the outer pipe; A backflow prevention means built in the upper portion of the mixing part to prevent a backflow of the supply and completion material to the upper side of the injection pipe; And fixing means mounted to the injection pipe on the lower side of the outer pipe and being in close contact with the inner circumferential surface of the reinforcement pipe while being compressed by the lowering of the outer pipe to prevent leakage of the flow and supply and finalization of the injection pipe. Characterized in that.

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

Figure 1 is a cross-sectional conceptual view showing the overall configuration and embodiment of the ground strengthening agent injection device according to the present invention Figure 1 (a) is a state before the ground strengthening agent, Figure 1 (b) is a state in which the ground strengthening agent is injected It is shown.

As shown, the ground strengthening agent injection device according to the present invention is largely composed of the injection pipe 100, the outer pipe 200, the mixing unit 300, the backflow preventing means 400 and the fixing means 500.

Ground reinforcing agent injection device according to the present invention of the configuration as described above is a plurality of through-holes 2 are formed through the outer circumferential surface at regular intervals along the longitudinal direction and the tape 3 to cover the through-hole 2 is attached It is inserted into the reinforcing pipe (1) to be added to the ground reinforcing agent (R), which is a mixture of grades, finished materials (A, B) into the surrounding ground (6).

Here, in the present invention, in the case of the reinforcing pipe (1) is shown as a steel pipe of the upper surface is opened and the lower surface is closed in a conical shape, in addition to the steel pipe, the bottom surface is flat and the rubber packing is mounted on the inner bottom surface Polyethylene pipes (also known as menjet pipes, hereinafter 'menjet pipes') may be used.

In this case, the MenJet pipe is in the order-oriented construction, the steel pipe is suitable for the construction to prevent ground subsidence with the order.

When the steel pipe is used to prevent collapse due to ground subsidence with the order, the steel pipe itself plays a role corresponding to the framing role of the building due to the material properties of the steel pipe together with the ground reinforcement by the ground reinforcing agent (R). This is possible by acting as a structure to prevent ground subsidence.

4 is a seal material injected to assist the standing of the reinforcement pipe 1 and temporarily block the inflow of groundwater, and 5 is a bit for excavation (not shown). As indicated by perforation.

Here, the material (4) is a mixture of cement, water and bentonite, to maintain a gel (gel) state by the bentonite and can be injected by adjusting the hardness appropriately according to the mixing ratio of cement and water. have.

At this time, the bentonite is a mixture of quartz, feldspar, zeolite, etc., and has the property of swelling by adsorbing water, and the main component and casting type of dilution for petroleum digging. It is used as a binder, a mixing agent of ceramic raw materials and an ointment base.

Subsequently, each component of the present invention will be described in detail.

The injection pipe 100 according to the present invention is inserted into the reinforcement pipe 1, and the injection hole 110 and the discharge hole 120 are provided so that any one of the grade and the final material A and B is the injection hole ( Injection through 110).

In the present invention, the fastener (A) of the mixed component of the ground hardener (R) through the inlet 110, the outer pipe 200 to be described later to the final material (B) of the mixed component of the ground hardener (R) Although each is shown as being injected, it is not necessarily limited to this, and vice versa.

In this case, the fastener (A) is a silica sol (silica sol), the final material (B) is a cement paste (cement paste) prepared by the appropriate combination of cement and water are used, respectively. The gel-enhanced ground reinforcing agent (R) formed by the mixing of B) penetrates the reinforcing pipe 1 and the surrounding ground 6.

In the case of the above ground hardening agent (R), depending on the construction environment or conditions, it may be appropriately selected to harden slowly, quickly, or very quickly (hereinafter referred to as "first grade"). In the present invention, the ground hardening agent (R) is used for soft ground. The hardening time of) is chosen to be used in the beginner which is made within 5 to 10 seconds.

In addition, the injection pipe 100 serves as the injection pipe of the quickening material (A) and at the same time, by the mixing of the finish, the completion material (A, B) by the mixing unit 300 to be described later mounted on the lower side Also serves as a discharge pipe of the ground strengthening agent (R) prepared.

On the other hand, the outer pipe 200 according to the present invention forms a double pipe structure in which the outer pipe 200 itself is the outer pipe, the outer pipe 200 itself as the outer tube and maintains a constant interval with the outer peripheral surface of the injection pipe 100 And, it is lifted by the pressing hole 240 to be described later along the longitudinal direction of the injection pipe 100.

That is, the outer pipe 200 forms a space (s) into which the final material (B) is injected while surrounding the outer circumferential surface of the injection pipe (100), and largely as the body pipe (220) and the pressing hole (240). Is done.

Here, if the body pipe 220 is further divided, it can be seen that the upper coupling socket 222, the connecting pipe 224 and the lower coupling socket 226.

The upper coupling socket 222 is of a cylindrical shape provided with an upper through hole 221 on the upper surface, the lower surface is opened and the injection hole 210 on the side, the connection pipe 224 is the upper coupling socket Screwed to the lower end of 222, the upper and lower ends of the cylindrical shape is open.

In addition, the lower coupling socket 226 has a cylindrical shape in which an upper surface is open and a lower through hole 225 is formed in the lower surface by being screwed with the lower end of the connection pipe 224.

Therefore, the injection pipe 100 is coupled through the upper and lower through holes 221 and 225, and the connection pipe 224 has upper and lower coupling sockets 222 and 226 corresponding to the length of the reinforcement pipe 1. It can be attached by attaching more than one in between.

Here, the connection pipe 224 is usually used to about 1 to 2 meters, depending on the depth of the perforation (5) the injection pipe 100 is also the compression port 240 to be described later and the mixing portion 300 Can be used by mounting a plurality of connections between the upper end of the.

Here, reference numeral 250 denotes a packing for preventing the leakage of the finished material B injected through the injection hole 210.

On the other hand, the pressing hole 240 according to the present invention is mounted on the injection pipe 100 flow path of the upper side of the body pipe 220 is pressed down the body pipe 220 to the fixing means 500 to be described later The reinforcing pipe 1 serves to be in close contact with the inner circumferential surface, and consists of a crimping socket 242, a guide pipe 244, and a crimp 246.

The crimping socket 242 has a cylindrical shape in which an upper side is opened and a lower surface is in contact with an upper surface of the body pipe 220, that is, an upper surface of the upper coupling socket 222. ) And a coupling hole 241 for coupling with the upper through hole 221 of the upper coupling socket 220.

The guide pipe 244 is formed on the outer circumferential surface of the thread 243 in the longitudinal direction to be seated on the crimping socket 242, each end is substantially disposed on the flow path of the upper side of the injection pipe 100 The injection pipe 110 is coupled to the injection pipe 100 and the mixing unit 300 to be described later.

The presser 246 is composed of a body 245 and a handle 245 ', the body 245 is in contact with the upper edge of the crimping socket 242 and the thread 243' is formed on the inner peripheral surface And a ring shape that is combined with the screw thread 243 of the guide pipe 244 to move up and down.

The handle 245 'protrudes from the outer circumferential surface of the ring-shaped body 245, and is provided for holding by the user to contact the fixing means 500 to be described later on the inner circumferential surface of the reinforcing pipe 1.

On the other hand, the mixing part 300 according to the present invention is mounted on the lower side flow path of the injection pipe 100, a plurality of inlet holes 320 are formed along the outer circumferential surface of the injection pipe 100 and the outer pipe The inflow from the 200, the finished material (A, B) is made to be mixed.

More specifically, the mixing part 300 is mounted to the lower side of the outer pipe 200, the upper and the injection pipe 100 and the inlet hole 320, the finishing material (A, B) flowing from the inlet ) Is a cylindrical socket provided therein with a mixing chamber 310 where mixing is performed.

The ground strengthening agent (R), which is a mixture of the grades and the finished materials (A, B), is discharged to the injection pipe (100) outlet (120) side of the mixing unit (300).

On the other hand, the backflow prevention means 400 is mounted in the mixing part 300 in order to prevent the feed, the final material (A, B) to flow back to the upper side of the injection pipe 100, large ball 420 ) And a spring 440.

The ball 420 is built in the upper side of the mixing unit 300, more specifically, the mixing chamber 310, the upper side of the mixing unit 300 is a grade, finished material mixed in the mixing chamber 310 It serves to prevent backflow of (A, B).

To this end, the spring 440 is mounted on the lower side of the ball 420, it is possible to prevent the reverse flow of the grade, the finished material (A, B) by holding the ball 420 upward.

The mixing part 300 in which the backflow prevention means 400 having the above-described configuration is built to be built in close to the bottom surface of the outer pipe 200.

This is because the mixture of grades and finishes A and B mixed in the mixing chamber 310 of the mixing section 300, that is, the ground strengthening agent R, is a superstructure.

That is, the ground hardener R may be referred to as technical means for discharging as quickly as possible through the discharge pipe 120 of the injection pipe 100 in the mixing chamber 310.

In addition, the position of the inlet hole 320 of the mixing part 300 is to be formed on the lower side than the point corresponding to the diameter of the ball 420 when viewed based on the vertical direction of the mixing part 300 It is preferable.

If the inlet hole 320 is formed at an upper side than a point corresponding to the diameter of the ball 420 on the outer circumferential surface of the mixing part 300, the final material B supplied from the outer pipe 200 is an inlet hole ( As it flows into the mixing chamber 310 through 320, the ball 420 is pushed up together with the spring 440.

Therefore, the fastener A to be supplied to the mixing chamber 310 through the injection pipe 100 is not smoothly supplied due to the elastic support force of the spring 440 and the pressure of the finished material B introduced. Will occur.

Accordingly, the inflow hole 320 is formed to penetrate at an appropriate position of the outer peripheral surface of the mixing part 300 as described above.

On the other hand, the fixing means 500 according to the present invention is in the injection pipe 100 protrudingly coupled to the outside through the lower through hole 225 of the lower side of the outer pipe 200, more specifically the lower coupling socket 226. Is mounted.

The fixing means 500 is compressed by the body pipe 220 interlocked with the pressing hole 240, as shown in Figure 1 (b) while being in close contact with the inner circumferential surface of the reinforcement pipe (1) the injection pipe ( It is to prevent the leakage of the shaking and feeding, the final material (A, B) of 100).

The fixing means 500 is largely made of a rubber packing 520 and a fixing washer 540, the rubber packing 520 is a coupling hole 510 having an inner diameter corresponding to the outer diameter of the injection pipe 100 is a length It penetrates along the direction and is mounted to the injection pipe 100.

The rubber washer 540 is mounted on an outer circumferential surface of the injection pipe 100 at the lower side of the rubber packing 520 to prevent the rubber washer 520 from being separated as described above.

The construction example of this invention of the above structure is demonstrated.

Figure 2 is a conceptual diagram showing an embodiment of the construction of the ground strengthening agent injection device according to the present invention.

First, the user forms the perforations 5 with the excavation bits b mounted at the ends of the connection pipe p in the ground 6 as shown in FIG.

Subsequently, the user releases the interconnection between the connecting pipe p and the drilling bit b as shown in FIG. 2 (b), leaving the drilling bit b on the bottom of the perforation 5. The conical bottom surface of (1) is temporarily fixed to the center of the perforation (5), and as shown in FIG. 2 (c), the material 4 is disposed between the outer peripheral surface of the reinforcing pipe 1 and the inner peripheral surface of the perforation 5. Will be injected into the space.

Here, placing the drilling bit (b) on the bottom surface of the perforation 5 covers the end of the reinforcing pipe 1 including the conical bottom surface so as not to fall, while drilling the reinforcement pipe 1 as much as possible. In order to be located at the center of (5) to ensure that the material (4) is uniformly distributed in the space between the reinforcing pipe (1) and the perforation (5).

Next, the user injects the material (4), but before the drilling bit (b) is submerged in the material (4) by inserting a connecting pipe (p) to reconnect with the drilling bit (b) The drilling bit b is removed from the perforation 5 and the injection of the material 4 is continued.

Here, the material 4 is a mixture of bentonite in the cement mixed with water as described above, the bentonite serves to maintain the texture of the material 4, such as jelly.

At this time, the bentonite serves as an expanding agent and delays solidification of the cement mixed with water to closely adhere to the outer circumferential surface of the reinforcing pipe 1 and the inner circumferential surface of the perforation 5 to temporarily support the reinforcing pipe 1. Will be

Subsequently, the user fills the material 4 between the reinforcing pipe 1 and the perforation 5 as shown in FIG. 2 (c), and after 6 to 24 hours has elapsed, the present invention as shown in FIG. The ground reinforcing agent injection device according to the present invention is inserted into the reinforcing pipe 1 to inject the ground reinforcing agent R into the ground 6 side.

Here, the ground strengthening agent (R) discharged through the outlet 120 of the injection pipe 100 is discharged at a pressure of about 3 to 7 kg / ㎠, the rapid, complete injection into each injection hole (110, 210) The injection pressure of the ash (A, B, see Fig. 1 below) is also to be injected at the same time in the same range.

At this time, the strength of the material (4), also known as homo gel (homo gel) compressive strength is enough to be evenly penetrated into the ground (6) surrounding the ground (4) the ground hardener (R). It is preferable to maintain about 3kg / ㎠.

Subsequently, the user injects the ground reinforcing agent R step by step through the through holes 2 formed at regular intervals from the lower side to the upper side of the reinforcing pipe 1 as shown in FIG.

Here, looking at the operation process of the ground reinforcing agent injection device (hereinafter 'device') according to the present invention.

For reference, reference numerals of each component of the apparatus will be referred to FIG. 1.

First, the user lowers a device in which a plurality of connection pipes 224 of the injection pipe 100 and the body pipe 220 are connected to the bottom surface of the reinforcement pipe 1 corresponding to the depth of the reinforcement pipe 1.

Next, the user rotates the handle 245 'of the pressing hole 240 mounted on the upper flow path side of the injection pipe 100 to lower the body pipe 220 so that the rubber packing of the lower side of the body pipe 220 ( 520 is compressed and expanded to be fixed to the outer circumferential surface of the reinforcing pipe (1).

Subsequently, the user simultaneously injects grade and finish materials A and B through the injection hole 110 of the injection pipe 100 and the injection hole 210 of the outer pipe 200, and injects the grade and finished material ( A, B is the ground hardener (R) in the mixing chamber 310 is to be discharged through the outlet 120.

Subsequently, the user turns the handle 245 'in the opposite direction to release the rubber packing 520 to move the device to the upper side.

When the ground hardener (R) is solidified within 5 to 10 seconds, the user is to fix the device to the solidified ground hardener (R) and to repeat the operation as described above.

Here, the homogel compressive strength of the ground-solidified ground hardener (R) is 9 to 11 kg / ㎠ to serve as a structure to prevent the settlement of the surrounding ground (6) at a suitable strength easy to repair later It is desirable to maintain the degree.

Finally, the user removes the device from the perforation 5 when the series of work shown in FIG. 2 (d) is finished, and the construction state after the series of work is completed by the diffusion center C as shown in FIG. As a reference, it can be seen that the ground hardener R is spread by a predetermined distance to form a diffusion diameter D.

The diffusion diameter (D) is somewhat different depending on the construction environment, but when the conventional diffusion center (C) is about 100mm or less is made in about 800 to 1000mm, the diffusion center (C) and the adjacent diffusion center (C) It is preferable that the distance with the N) is 800 mm or less so that portions overlapping the diffusion diameters D are formed.

Here, the diffusion diameter (D) can be increased by injecting the ground hardening agent (R) and the slowly hardening ground hardening agent according to the present invention of the initial grain.

That is, the ground hardening agent (R) of the initial grain solidifies very quickly while the diffusion penetration distance is short, and the ground hardening agent which is slowly solidified has a relatively long diffusion penetration distance, so that each ground hardener is alternated by using the properties of the ground hardening agents. The injection method is to be carried out.

Subsequently, even after the completion of the construction as shown in Figure 2 (e), when there is a need to repair and repair the construction, empty the inside of the reinforcement pipe (1) with a separate spray cleaning device (not shown) and then ground Reinforcement (R) can be injected again.

To explain this briefly, the pipe nozzle end of the spray cleaning device in which water is injected at a high pressure is sharply processed to remove the coagulated ground hardener (R) with water while removing it with water to secure a space in the reinforcement pipe (1) and the ground hardener (R). Just inject

As described above, the present invention provides a ground strengthening agent injection device that can prevent groundwater inflow and ground subsidence that are introduced after the drilling is carried out on the soft ground, and also enable post maintenance by injecting the ground reinforcing agent. It can be seen that the basic technical idea.

In addition, many modifications and applications are possible to those skilled in the art within the scope of the basic technical idea of the present invention.

According to the present invention of the above configuration can be expected the following effects.

First, by adopting a method of inserting a reinforcing pipe, which is a steel pipe after drilling, and injecting a ground reinforcing agent into the soft ground, it is possible to prevent ground subsidence as a reinforcement pipe as well as the order.

In addition, by adopting a structure that is discharged by mixing in the mixing unit with the built-in backflow prevention means immediately before the outlet, rather than the method of injection in the state in which the feed and the final material is mixed, the clogging phenomenon and the backflow phenomenon due to the solidification of the feed and the final material is not shown. Will be prevented.

In addition, it is a very useful invention in that the construction can be re-injected only by reinforcing the existing reinforcing pipe without the hassle of re-punching the surrounding ground for the purpose of repairing, even after the completion of construction. .

Claims (7)

Geotechnical reinforcing agent, which is formed through a plurality of through holes on the outer circumferential surface along the longitudinal direction, is inserted into the reinforcement pipe embedded in the ground to cover the through holes, and is injected into the reinforcement pipe which is discharged from the distal end. In the injection device, The injection pipe is inserted into the reinforcement pipe, and one of the feed and the final material is injected through the injection hole, and the ground pipe is discharged to the discharge hole. An outer pipe formed around the outer circumferential surface of the injection pipe to form a space portion, and having an injection hole for injecting one of the feeding and finishing materials into an upper side thereof; A mixing part mounted on a lower side flow path of the injection pipe and having a plurality of inflow holes formed along an outer circumferential surface thereof so as to mix rapid and final materials introduced from the injection pipe and the outer pipe; A backflow prevention means built in the upper portion of the mixing part to prevent a backflow of the supply and completion material to the upper side of the injection pipe; And It is mounted to the injection pipe of the lower side of the outer pipe, the compression means by the lowering of the outer pipe while being in close contact with the inner circumferential surface of the reinforcement pipe to prevent the flow of the injection pipe and leakage of the finished material; including; Ground strengthening agent injection device, characterized in that. The method of claim 1, The outer pipe, A cylindrical body pipe into which one of the rapid and final materials is injected into the space part from an upper side; And And a pressurizing port mounted on the injection pipe flow path on the upper side of the body pipe to press down the body pipe so as to closely contact the fixing means with the inner circumferential surface of the reinforcing pipe. The method of claim 2, The body pipe, An upper through hole is formed in the upper surface, the lower surface is opened, the upper coupling socket of the cylindrical shape formed with an injection hole on the side; A connection pipe having a cylindrical shape that is screwed with a lower end of the upper coupling socket and has upper and lower ends open; And Being screwed with the lower end of the connecting pipe, the upper surface is open and the lower coupling socket of the cylindrical shape having a lower through hole formed in the lower surface; The injection pipe is coupled through the upper and lower through holes, and the connection pipe is ground reinforcement injection device, characterized in that a plurality of connections are mounted according to the length of the reinforcement pipe. The method of claim 2, The crimp is, A compression socket whose upper side is opened and whose lower surface is in contact with the upper surface of the body pipe; Guide pipes are formed on the outer circumferential surface in the longitudinal direction and seated on the crimp socket; And A presser having a ring-shaped body which is in contact with an upper edge of the crimping socket and is formed on an inner circumferential surface thereof to elevate the guide pipe outer circumferential surface, and a handle protruding from the outer circumferential surface of the body; Reinforcing device. The method of claim 1, The mixing unit, A cylindrical shape is mounted on the lower side of the outer pipe and has a mixing chamber in which the upper and lower injection pipes and the feed and finish material flowing from the inlet are mixed to discharge the ground hardener to the lower side of the injection pipe outlet. Ground reinforcement device, characterized in that the socket. The method of claim 1, The backflow prevention means, A ball embedded in the upper side of the mixing part to prevent a backflow of the feeding and finishing materials mixed inside the mixing part; And The ground strengthening device injection device, characterized in that consisting of; a spring mounted on the lower side of the ball to hold the ball upward. The method of claim 1, The fixing means, A rubber packing in which a coupling hole having an inner diameter corresponding to an outer diameter of the injection pipe is formed through the longitudinal direction and mounted to the injection pipe; And And a ground washer mounted on an outer circumferential surface of the lower portion of the rubber packing to prevent separation of the rubber packing.

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