KR101115783B1 - Method for direct boring and grouting using duplicate pipe - Google Patents

Abstract

The present invention relates to a double-pipe straight hole grouting method, and to reduce the amount of grout material used, the strength is stronger than a single pipe, and relates to a double pipe grouting method using a straight hole method that can prevent backflow of the grout material.

The double-pipe direct hole grouting method of the present invention has a technical feature that the rod for transmitting power to the direct hole bit also serves as an inner tube, or inserts a rod for transmitting power to the direct hole bit after inserting the outer tube and the inner tube first. .

Direct Hole, Double Pipe, Rod, Grout Material, Valve

Description

Double pipe straight grouting method {Method for direct boring and grouting using duplicate pipe}

The present invention relates to a double-pipe direct-grouting grouting method, and more particularly, to a double-pipe direct-hole grouting method that can reduce the amount of grouting material used to prevent the backflow of the grouting material and to increase the strength by using a double pipe.

In general, grout or grouting refers to injecting fillers into cracks and cavities in the ground for leakage prevention work or soil stability in civil works, and the fillers (sometimes called grout materials). Charge by gravity or pump.

This grouting method installs the steel pipe on the ground and installs the packer inside the steel pipe, injecting and solidifying the grout material, thereby integrating the steel pipe and the ground, increasing the shear strength of soil and rock, and injecting the steel pipe into the steel pipe. It is a very advantageous method in terms of workability and economical efficiency.

In general, the steel pipe grouting method consists of drilling a ground, inserting a steel pipe provided with a strainer in the drilling hole, injecting a sealing material between the steel pipe and the drilling hole, and injecting cement while installing a packer.

However, this method is difficult to insert the steel pipe due to the collapse of the drill hole, the mixing of foreign matter, etc. in the soft soil ground difficult to maintain the drill hole because the steel pipe is inserted after the drilling is not practical.

In order to solve this problem, a direct drilling apparatus / method for inserting a steel pipe at the same time as the drilling has been proposed.

1 and 2 is a view showing the configuration of the steel pipe which is the main portion of the conventional direct drilling apparatus.

The conventional direct boring apparatus shown in FIG. 1 is a structure in which a strainer is screwed with a punched bit 4 which is externally threaded on the outer circumferential surface of the inner circumferential surface of the distal end of the steel pipe 1 on which the strainer 11 is mounted. The direct drilling apparatus shown in FIG. 2 has a configuration in which the steel pipe 1 and the drilling bit 4 are screwed together and the power transmission rod 3 is integrally raced together.

However, since the conventional direct drilling apparatus uses a single steel pipe, the amount of grout material injected is increased, causing a material cost increase, and the direct drilling apparatus of FIG. 2 is impossible to reuse the power transmission rod. It causes the cost of materials to rise.

In addition to these economic disadvantages, since the use of a single steel pipe, the strength of the steel pipe is weak and easily collapses to external stress.

The present invention devised in order to solve the problems of the prior art as described above is a double pipe straight hole grouting can improve the strength of the pipe by using a double pipe in a direct drilling device or a direct drilling method and significantly reduce the material cost by reducing the amount of grout material used The purpose is to provide a process.

The object of the present invention is the step of combining the outer perforated bit and the grout material outlet is provided, the step of inserting the inner tube for transmitting power to the direct perforated bit into the interior of the exterior fastening to the perforated bit, the direct It is achieved by a double pipe perforated grouting method comprising the step of transmitting power to the inner tube fastened to the drill bit and injecting grout material into the space between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube.

In addition, another object of the present invention is to combine the outer tube having a grout material outlet and the inner tube smaller than the diameter of the outer shell with the direct hole bit, by inserting a rod having a diameter smaller than the inner tube into the inner tube bit into the direct hole bit Combining, transmitting power to the rod to drill the ground, removing the rod, covering the inner tube cap on one side of the inner tube that is not fastened to the direct drilling bit, and the inner circumferential surface of the exterior And a double tube perforated grouting method comprising the step of injecting the grout material into the space between the outer circumferential surface of the inner tube and the inner tube.

On the other hand, before the step of injecting the grout material may further include the step of covering the outer cap on one side of the outer side of the outer perforated bit is not fastened before the step of injecting.

On the other hand, the outer peripheral surface and the outer peripheral surface of the inner tube may further include a spacer for maintaining a predetermined distance.

On the other hand, the grout material may be a urethane.

On the other hand, the grout material outlet may further include a valve for controlling the outflow of the grout material.

On the other hand, the valve is made of a fixed member formed with a discharge hole, the elastic member inserted into the discharge hole and when the grout material reaches a predetermined pressure may deform the elastic member to flow out the grout material.

Therefore, the present invention can significantly reduce the use of the grout material to reduce the construction cost, improve the strength by using a double pipe can be installed stably in the soft ground, there is an effect that can prevent the backflow of the grout material.

In addition, the present invention by using a double tube of the outer tube and the inner tube to improve the strength while the inner tube to serve as a rod, there is no need to make a separate rod can reduce the material cost and there is an effect that can simplify the process.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

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

≪ Example 1 >

Figure 3 shows a double-pipe straight hole grouting method according to an embodiment of the present invention.

First, the outer periphery 104 which has the direct drilling bit 102 and the grout material outlet 400 is combined (FIG. 3 (a)).

If the valve 400 to be described later can be installed in the grout material outlet 400, <identification code 400> of the drawing is to selectively display the grout material outlet or valve.

The direct drilling bit 102 serves to drill (perforate) the ground and the like, and the exterior 102 coupled thereto has a grout material outlet 400 so that the grout material can flow into the external ground and the grout material outlet is In order to smooth out the grout material flow, the diameter of the outer circumference from the outer circumference to the inner circumference may be reduced.

The fastening part 150 to which the direct drilling bit 102 and the exterior 104 are coupled to or fastened may be used in various ways. For example, the external thread of the vertical drilling bit 102 may be externally threaded, or the internal thread of the exterior 104 may be internally threaded. It is possible to process by fastening, the method of welding the perforated bits and the appearance.

Next, an inner tube 202 transmitting power to the direct drilling bit 102 is inserted into the exterior 102 to connect or fasten to the direct drilling bit 102 (FIG. 3B).

Conventionally, a rod for transmitting power to a direct drilling bit is inserted, but the inner tube 202 of the present invention has a technical feature in that it serves as an inner tube while serving as a conventional rod.

The fastening of the inner tube 202 and the perforated bit 102 can be a variety of ways. For example, a method of male threading on the distal end portion 202a of the inner tube fastened to the direct drilling bit 102 and female threading on the inner circumferential surface of the direct drilling bit 102, the ring bit and the pilot rod described in the second embodiment The bit structure may be used.

Next, power is transmitted to the inner tube 202 fastened to the direct drilling bit 102 to puncture. The drilling operation is omitted because it uses a well-known drilling mill.

Next, the grout material is injected into the space G between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube (Fig. 3 (c)).

As grout material, cement, urethane, etc. can be used, but urethane is preferable.

Urethane has the disadvantage of being expensive, but due to the characteristics of the chemical solution is less environmental problems and solution type because it is not only excellent penetration power into the ground, but also has the advantage of excellent durability and strength characteristics of the solidified body.

On the other hand, the grout material outlet 400 of the appearance may further include a valve 400 to be described later for discharging the grout material when the grout material reaches a constant pressure, the valve also serves to prevent backflow of the grout material .

The exterior 104 and the inner tube 202 described above are preferably cylindrical, which is easy to withstand external pressure, but are not limited thereto. The material may be a steel pipe, a fiberglass reinforced plastic (FRP), or the like.

On the other hand, it is preferable to further include a spacer (Spacer, 300) for maintaining a constant distance between the inner circumferential surface of the exterior 104 and the outer circumferential surface of the inner tube 202, the material and shape of the spacer 300 is limited none. For example, a method of adjusting the distance between the inner circumferential surface of the outer appearance 104 and the outer circumferential surface of the inner tube 202 may be performed by installing the screw in the outer tube or the inner tube in advance and rotating the screw after the drilling operation is completed.

In addition, both sides of the inner tube 202 may be a sealed structure, but in the case of the non-sealed structure, the inner tube 202 is fastened with a straight hole bit of both sides of the inner tube so that the grout member does not enter the inner tube 202 before the injection of the grout material. It is preferable to cover the inner tube cap 204 on one side that is not sealed, and then cover the outer cap 110 on one side of the outer side that is not fastened with the perforated bit and open the opening of the outer cap 110. The grout material is injected through the unit 120.

Figure 4 is a cross-sectional view showing the structure and operation of the valve according to an embodiment of the present invention.

As shown in FIGS. 4A and 4B, the valve 400 includes a fixing member 471 having a discharge hole 472 and an elastic member inserted and fixed to the discharge hole 472 of the fixing member. It is preferable that it consists of 474. The elastic member 474 is preferably made of a rubber material. At this time, the elastic member 474 protrudes a part thereof, and a locking protrusion 475 is formed, and the fixing member 471 is formed from the discharge hole 472 of the fixing member so that the locking protrusion 475 of the elastic member can be fixed. An extended locking groove 473 is formed. Therefore, the locking projection 475 of the elastic member is fixed to the locking groove 473 of the fixing member so that the elastic member 474 is inserted into the discharge hole 472 of the fixing member. In addition, the discharge hole of the fixing member 471 is formed to be widened in the direction in which the grout material is discharged, and the elastic member 474 also has a shape suitable for the discharge hole, thereby preventing the reverse flow of the discharged grout material.

As shown in FIG. 4B, the pressure of the grout material existing in the space G between the exterior 104 and the inner tube 202 is set at a predetermined pressure, that is, the elastic member 474 is inserted into the discharge hole 472 of the fixing member. When the deformed state reaches the pressure at which the discharge hole 472 can be opened, the elastic member 474 is deformed to discharge the grout material between the discharge holes 472 of the fixed member. Therefore, the elastic member 474 selects a rubber material having an appropriate elastic force and inserts the rubber material into the discharge hole 472 of the fixing member 471 to preset the pressure at which the grout material can be discharged through the valve 400.

<Example 2>

Figure 5 shows a double tube direct hole grouting method according to another embodiment of the present invention.

Hereinafter, a description will be given with reference to FIG. 5, and a description of the same parts as those described in <Embodiment 1> will be omitted.

First, the outer surface 104 provided with the grout material outlet 400 and the inner tube 202 smaller than the diameter of the outer surface are coupled to or fastened to the direct drilling bit (FIG. 5 (a)).

The exterior 104 and the inner tube 202 may be an integral structure, and may be made of steel pipe or fiber reinforced plastic, respectively.

Next, a rod 250 having a smaller diameter than the inner tube is inserted into the inner tube inner 202 and fastened to the straight hole bit 102 (FIG. 5B).

The fastening of the direct hole bit 102 and the rod 250 may be used in various ways. FIG. 6 illustrates a quick rod bit 260 fastened to the tip end portion 250a of the rod and a straight hole bit fastened thereto. (Ring bit) 102 will be shown.

That is, after installing the pilot rod 260 (FIG. 6) in the tip end portion 250a of the rod to fasten the inner tube 202 to the direct drilling bit 102, the direct drilling bit (ring) By inserting the pilot rod bit 260 into the bit 102, and turning a predetermined angle in a clockwise or counterclockwise direction is fastened.

Unlike <Example 1>, the rod of <Example 2> does not serve as an inner tube, and the inner tube 202 is already fastened to the straight hole bit 102.

Next, power is transmitted to the rod to drill the ground (FIG. 5 (c)). The drilling of the ground by transmitting power to the rod can be omitted because it is possible to use a well-known mill.

Next, the rod is removed (FIG. 5 (d)). As such, since the rod 250 and the pilot rod bit 260 are removed after drilling, the material cost can be prevented and the double pipe structure can be used to increase the strength thereof.

Next, grout material is injected (FIG. 5 (e)).

In order to inject the grout material, the inner tube cap 204 is placed on one side of the inner tube 202 that is not coupled to or fastened to the straight hole bit 102 so that the grout material is not injected into the inner empty space of the inner tube 202. do.

Unlike the first embodiment, since the rod 250 is inserted into the inner tube 202 and then removed, the side in which the inner tube 202 is not coupled to or fastened to the straight hole bit 102 should be open. .

In addition, to inject the grout material, the grout material is injected through the opening 120 of the outer cap 110 to the outer side cap 110 on one side of the outer surface 104 which is not coupled to the direct punch bit.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

1 and 2 is a view showing the configuration of the steel pipe which is the main portion of the conventional direct drilling apparatus.

Figure 3 shows a double-pipe straight hole grouting method according to an embodiment of the present invention.

Figure 4 is a cross-sectional view showing the structure and operation of the valve according to an embodiment of the present invention.

Figure 5 shows a double tube direct hole grouting method according to another embodiment of the present invention.

6 illustrates a pilot rod bit and a perforation bit according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

102: direct drill bit 104: appearance

110: appearance cap 202: inner tube

204: inner cap 250: rod

260: fast rod bit 300: spacer

400: grout material outlet or valve

Claims (7)

Combining an externally provided with a perforated bit and a grout material outlet and a valve installed at the grout material outlet to control the outflow of the grout material; Inserting an inner tube which transmits power to the rectilinear bit into the interior of the exterior and fastening to the rectilinear bit; Drilling by transmitting power to an inner tube fastened to the direct drilling bit; Forming a spaced distance between the outer tube and the inner tube through a spacer between the outer tube and the inner tube; Covering an exterior cap on one side of the exterior side that is not fastened to the direct drilling bit; And And injecting grout material into a space between the inner circumferential surface of the exterior and the outer circumferential surface of the inner tube. delete delete delete The method of claim 1, The grout material is a double tube straight hole grouting method, characterized in that the urethane. delete According to claim 1, The grout material injection step, When the grout material reaches a preset pressure, the elastic member of the valve consisting of a fixing member formed with a discharge hole and an elastic member inserted and fixed to the discharge hole is deformed to flow out the grout material, the double-pipe straight hole type grouting method .

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