KR102079076B1 - Reinforced steel pipe one shot grouting and drilling - Google Patents

Abstract

The present invention relates to a steel pipe capable of simultaneously drilling and injecting grouting, which drills the ground to allow penetration in the ground and allow grouting to reinforce the ground. The steel pipe capable of simultaneously drilling and injecting grouting comprises: a steel pipe body formed in a pipe shape to be inserted and installed in ground, and provided with a plurality of grouting holes formed in a row through the outer surface thereof; inner packers installed in the steel pipe body to be separated at regular intervals in the longitudinal direction of the steel pipe body to divide an internal space; a plurality of first injection pipes installed in the steel pipe body to inject grouting liquid into the inner packers to divide the internal space of the steel pipe body, and provided with injection holes configured to communicate with the inner packers and formed through the outer surface thereof; a second injection pipe allowing the grouting liquid to spurt out of the steel pipe body through the grouting holes to allow grouting after the grouting liquid is filled in the divided internal space of the steel pipe body, and having spurting holes formed through the outer surface thereof; and a bit arranged on one end of the steel pipe body to drill the ground. The interior of the steel pipe is accurately divided into a plurality of spaces to properly allow grouting for each section to allow accurate construction. The separate bit is arranged on the end of the steel pipe body to allow grouting immediately after drilling the ground by using the steel pipe body to allow quick construction.

Description

Direct drilling grouting simultaneous injection steel pipe {REINFORCED STEEL PIPE ONE SHOT GROUTING AND DRILLING}

The present invention relates to a straight hole grouting simultaneous injection steel pipe, in particular, having a separate bit at the end of the steel pipe body in the straight hole grouting simultaneous injection steel pipe that can be made to grouting construction immediately after the drilling of the ground is completed It is about.

In general, grout or grouting is used to inject fillers into cracks and cavities in the ground for reinforcement of excavation ground or for leak prevention work and soil stability when constructing tunnels in civil engineering works. The filler (also known as grouting material) is charged using gravity or a pump.

This grouting method installs steel pipes on the ground, and packers are installed inside the steel pipes to inject and solidify the grouting material, thereby integrating the steel pipes and the ground and increasing the shear strength of soil and rock. Therefore, it is a very advantageous method in terms of constructability and economic feasibility.

In general, the steel pipe grouting method consists of drilling a soft 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 matters, etc. in the soft soil ground difficult to maintain the hole because the steel pipe is inserted after the drilling is not practical.

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

1 is a plan view showing the structure of a steel pipe that is a main portion of a conventional direct drilling apparatus. As shown in Fig. 1, the direct drilling apparatus is configured to be screwed with the drill bit 3 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 2 is mounted. .

However, such a conventional direct boring device is provided with means for partitioning the inner space of the steel pipe (1) by packing and injecting with an air packer at the tip of the steel pipe in order to inject the grouting material into the steel pipe (1) Since the internal space cannot be partitioned, the injection pressure of the grouting liquid does not work uniformly, so that accurate grouting is not achieved.

And, Figure 2 is a plan view showing the structure of a conventional direct hole simultaneous injection device. As shown in Fig. 2, Patent Application No. 10-0776304 discloses "simultaneous perforation injection device", but this structure is also accurate grouting because it does not accurately partition the space inside the steel pipe as in the prior art of Figure 1 There is a problem that it is not made.

The present invention has been derived to solve the above problems, so that the inside of the steel pipe is correctly partitioned into a plurality of spaces so that the grouting is properly made for each section to ensure accurate construction, and a separate bit at the end of the steel pipe body The purpose of the present invention is to present a straight hole grouting simultaneous injection steel pipe that can be easily and quickly construction by making the grouting immediately after drilling the ground using the steel pipe body itself.

In order to solve the above problems, the present invention is a perforated grouting simultaneous injection steel pipe to reinforce the ground by making the grouting as well as to be able to penetrate into the ground by drilling the ground, is formed in a tubular A steel pipe body inserted into the ground and formed to penetrate a plurality of grouting holes on an outer surface thereof; An inner packer installed inside the steel pipe body at predetermined intervals along the longitudinal direction of the steel pipe body to partition an inner space; A plurality of first injection pipes installed in the steel pipe body to allow the grouting liquid to be injected into the inner packer to partition the inner space of the steel pipe body, and having an injection hole communicating with the inner packer on an outer surface thereof; After the grouting liquid is filled into the partitioned inner space of the steel pipe body, the grouting liquid is ejected to the outside of the steel pipe body through the grouting hole so that grouting is performed, and a blowout hole communicating with the inner space is formed on the outer surface. An injection tube; A bit provided at one end of the steel pipe body to drill the ground; Presents a straight hole grouting simultaneous injection steel pipe characterized by including.

Herein, the inner packer has a plurality of discharge holes penetrating through the side thereof, and the front and rear surfaces of the inner pipe are opened, and the front and rear surfaces of the inner pipe are inserted into and closed on the front and rear surfaces of the first injection pipe. And a reverse flow blocking portion formed with a through hole through the plate surface so that the second injection pipe passes, and both ends of the inner pipe are fastened by a tightening band, and when the grouting liquid is filled therein, it expands to expand the inner surface of the steel pipe body. It may include an inner packer material in close contact with the inner space.

The backflow blocking unit is disposed to face each other and is disposed between the inner fixing plate and the outer pressure plate, which are disposed on the inner side and the outer side of the inner pipe, respectively, and the inner fixing plate and the outer pressure plate, respectively, of the first injection pipe and the second injection pipe. And a nut in contact with an outer surface, a compression bolt penetrating the inner fixing plate, the inner material and the outer pressure plate, and a nut fastened to an end of the compression bolt to press the inner fixing plate and the outer pressure plate. Can be.

In addition, the diameter of the inner fixing plate may be formed with the same diameter as the inner diameter of the inner pipe, the diameter of the outer pressure plate may be formed with a diameter relatively larger than the diameter of the inner fixing plate.

In addition, the first injection pipe is provided with a plurality, each formed to have a different length, the first injection pipe having a relatively short length so that the grouting liquid is injected into the interior of the inner packer disposed in an area close to the excavation surface And the first injection tube having a relatively long length may allow the grouting liquid to be injected into the interior of the inner packer disposed in the distant region from the excavation surface.

And, the second injection pipe is provided with a plurality, each formed to have a different length, the second injection pipe having a relatively short length to allow the grouting liquid is injected into the inner space formed in the area adjacent to the excavation surface and relatively The second injection tube having a long length may allow the grouting liquid to be injected into the inner space formed in the distant region from the excavation surface.

In addition, the inner packer may be formed of geotextiles that partition the inner space of the steel pipe body by increasing the volume so that the inner surface and both sides of the steel pipe body is in close contact when the grouting liquid is injected through the first injection pipe.

In addition, a separate cover member may be provided at the other end opposite to one end of the steel pipe body provided with the bit to close the opening surface of the opened steel pipe body.

The straight hole grouting simultaneous injection steel pipe according to the present invention has the effect that the inside of the steel pipe can be correctly partitioned into a plurality of spaces so that the sealing force is maintained in each space so that the grouting can be properly performed for each section.

In addition, the grouting liquid is injected into the partitioned steel pipe, so that the pressure of the grouting liquid flowing out of the steel pipe during the grouting operation may be uniformly applied, thereby enabling the simultaneous injection steel pipe to be accurately installed.

In addition, the end of the steel pipe body is provided with a separate bit so that the grouting is made immediately after drilling the ground using the steel pipe body itself has an effect that can be made easy construction.

1 is a plan view showing the structure of a steel pipe that is a main portion of a conventional direct drilling apparatus,
Figure 2 is a plan view showing the structure of a conventional direct hole simultaneous injection device,
Figure 3 is a plan view showing the structure of a perforated grouting simultaneous injection steel pipe according to an embodiment of the present invention,
Figure 4 is a perspective view showing the external structure of the inner packer of the straight hole grouting simultaneous injection steel pipe according to an embodiment of the present invention,
5 is a cross-sectional view showing the internal structure of the inner packer of the straight hole grouting simultaneous injection steel pipe according to an embodiment of the present invention,
Figure 6 is a construction state diagram showing a state in which the direct hole grouting simultaneous injection steel pipe is constructed on the slope according to the present invention,
7 is a construction state diagram showing a state in which the direct hole grouting simultaneous injection steel pipe is constructed on the inner surface of the tunnel according to the present invention.

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

Figure 3 is a plan view showing the structure of a direct hole grouting simultaneous injection steel pipe according to an embodiment of the present invention, Figure 4 is a view showing the structure of the inner packer of a direct hole grouting simultaneous injection steel pipe according to an embodiment of the present invention 5 is a longitudinal cross-sectional view showing the structure of a simultaneous perforated grouting simultaneous injection steel pipe according to an embodiment of the present invention, Figure 6 is a view showing a state in which the perforated grouting simultaneous injection steel pipe is constructed on the slope 7 is a construction state diagram, Figure 7 is a construction state diagram showing a state in which the direct hole grouting simultaneous injection steel pipe is constructed on the inner surface of the tunnel.

As shown in these drawings, the direct drilling grouting simultaneous injection steel pipe according to the present invention, by drilling the ground to allow penetration into the interior of the ground as well as grouting is made by direct drilling to reinforce the ground A grouting simultaneous injection steel pipe, which is formed in a tubular shape and inserted into the ground, and has a plurality of grouting holes 110 formed through the outer surface to form a heat pipe body 100; An inner packer (200) installed in the steel pipe body (100) to be spaced apart at regular intervals along the longitudinal direction of the steel pipe body (100) to partition an inner space; Installed inside the steel tube body 100 to allow the grouting liquid to be injected into the inner packer 200 to partition the inner space of the steel tube body 100 and communicate with the inner packer 200 on the outer surface. A plurality of first injection pipes 300 having injection holes 310 formed therethrough; After the grouting solution is filled into the partitioned inner space of the steel pipe body 100, the grouting liquid is ejected to the outside of the steel pipe body 100 through the grouting hole 110 to grout the inner space on the outer surface. A second injection pipe 400 through which a blow hole 410 communicating with the through hole is formed; A bit 500 provided at one end of the steel pipe body 100 so as to perforate the ground; It is configured to include.

Steel pipe body 100 is formed to have a predetermined length serves to improve the structural stability of the structure to be installed by intruding into the ground to be reinforced.

Then, in order to further improve the structural stability of the structure, after the grouting liquid is filled in the interior of the steel pipe body 100, the grouting liquid flows out of the steel pipe body 100 to the inside of the ground, thereby surrounding the steel pipe body 100. The ground and the steel pipe body 100 is to be integrated, for this purpose, a plurality of grouting balls which are a passage through which the grouting liquid injected through the second injection pipe 400 flows outward to the side of the steel pipe body 100 ( 110 is formed through.

The steel pipe body 100 is formed to have a circular cross section, and the inner space partitioned by the inner packer 200 is provided inside the steel pipe body 100 so that the grouting liquid can be discharged to the outside after the chawon round. It is formed from a tubular member having a length.

The length of the steel pipe body 100 may be determined according to the strength of the ground to which the steel pipe is to be penetrated and installed. When the ground strength is relatively weak, the length of the steel pipe body 100 is formed to a deep depth. Perforation and penetration should be made, and in the case of relatively strong ground, it is desirable to form a short length of the steel pipe body 100 so that the depth of penetration is not so deep that easy perforation and penetration construction is achieved.

In other words, the straight hole grouting simultaneous injection steel pipe according to the present invention is to be provided with a separate bit 500 at the end of the steel pipe body 100, and at the same time to make the perforation of the ground using the steel pipe body 100 itself After the drilling is completed, the grouting is performed using the intrusive steel pipe body 100 itself.

The inner packer 200 is installed in the steel pipe body 100 so as to be spaced apart at regular intervals along the longitudinal direction of the steel pipe body 100 to partition the internal space through the second injection pipe 400 to partition the steel pipe body 100. The pressure that the grouting liquid is injected into the internal space is acted equally in each partitioned internal space.

The inner packer 200 has a plurality of discharge holes penetrating through the side, and the inner and outer pipes 210 are formed in front and rear, and the front and rear of the inner pipe are inserted into and closed at the front and rear of the inner pipe. The reverse flow blocking part 220 has a through hole formed in the plate surface so that the first injection pipe 300 and the second injection pipe 400 pass, and both ends of the inner pipe 210 are fastened by the tightening band 231. It is provided to tighten the grouting liquid is filled in the interior is in close contact with the inner surface of the steel pipe body 100 is configured to include an inner packer material 230 so that the inner space is partitioned.

The inner pipe 210 is disposed along the length direction of the inner packer 230 inside the inner packer 230 so that both ends of the inner packer 230 are fixed to the outer surfaces of both ends of the inner pipe 210. The grouting liquid to the inside of the inner packer 230 serves to maintain the appearance of the inner packer 230 to a certain extent during filling.

The reverse flow blocking unit 220 is the front and rear of the inner pipe 210 having an opening so as to prevent the grouting liquid from flowing out of the inner pipe 210 when the grouting liquid is filled into the inner packer material 230. It serves to close it.

The reverse flow blocking unit 220 is disposed to face each other and the inner fixing plate 221 and the outer pressure plate 222 and the inner fixing plate 221 and the outer pressure plate (222) which are disposed inside and outside the inner pipe 210, respectively ( 222 is provided between the water repellent member 223 and the outer surface of the first injection pipe 300 and the second injection pipe 400, the inner fixing plate 221, the water repellent material 223 and the outer pressure plate ( Compression bolt 224 penetrating through the 222, and the nut 225 is fastened to the end of the compression bolt 224 to the inner fixing plate 221 and the outer pressure plate 222 to press the order member 223. It is configured to include.

The inner fixing plate 221 and the outer pressurizing plate 222 are disc-shaped members formed of a metal material so that the outer shape thereof is not deformed, and a plurality of through holes are formed in the plate surface so that the first injection pipe 300 and the second injection pipe 400 are formed. Let this pass.

And, the diameter of the inner fixing plate 221 is formed to the same diameter as the inner diameter of the inner pipe 210, the diameter of the outer pressure plate 222 is formed to be a relatively larger diameter than the diameter of the inner fixing plate 221 is compressed The end of the resin member 223 is preferably pushed to the outside of the outer pressure plate 222 so as not to protrude so that the order of the order member 223 can be stably made.

The order member 223 has a plurality of through-holes formed in the plate surface to allow the first injection pipe 300 and the second injection pipe 400 to pass therethrough, and is compressed by the inner fixing plate 221 and the outer pressure plate 222. The periphery of the periphery is to be in close contact with the outer surface of the first injection pipe 300 and the second injection pipe 400 to prevent the grouting liquid from leaking.

Then, the inner fixing plate 221 and the outer pressure plate 222 is in close contact with the order member 223, respectively, so that the compression bolt 224, the inner fixing plate 221 and the outer pressure plate 222 to press the order member 223. And a nut 225 is fastened to an end of the compression bolt 224 through the central region of the order member 223.

The inner packer material 230 is a geotextile formed of a material such as a nonwoven fabric. When the grouting liquid is filled therein, the inner packer material 230 closely adheres to the inner surface of the steel pipe body 100, thereby increasing the volume of the internal space of the steel pipe body 100. Allow compartments.

The first injection pipe 300 is installed in the steel pipe body 100 serves to inject the grouting liquid into the interior of the inner packer 200, the first injection pipe 300 of the inner packer 200 Injection holes 310 are installed in a plurality of places on the outer surface so as to inject the grouting liquid into the inner packer 200 so as to be penetrated therein.

The first injection pipe 300 is provided with a plurality, but each is formed to have a different length, the first injection pipe 300 having a relatively short length is the inside of the inner packer 200 disposed in the area close to the excavation surface The grouting liquid is injected and the first injection pipe 300 having a relatively long length is effective to allow the grouting liquid to be injected into the inner packer 200 disposed in the distant region from the excavation surface.

On the other hand, the second injection pipe 400 is the steel pipe body through the grouting hole 110 formed in the steel pipe body 100 after the grouting liquid is filled in the internal space of the steel pipe body 100 partitioned by the inner packer 200 The grouting liquid is charged in the space between the hole 100 and the hole.

To this end, a plurality of ejection holes 410 are formed on the outer surface of the second injection pipe 400 so as to communicate with the internal space of the divided steel pipe body 100.

The second injection pipe 400 is provided with a plurality, each formed to have a different length, the second injection pipe 400 having a relatively short length is injected with the grouting liquid into the inner space formed in the area adjacent to the excavation surface It is preferable that the second injection pipe 400 having a relatively long length allows the grouting liquid to be injected into the inner space formed in the area of the distant from the excavation surface.

Then, the other end of the opposite end of the steel pipe body 100 is provided with a bit 500 to be provided with a separate cover member 600 to close the opening surface of the opened steel pipe body 100 The grouting liquid filled in the inner space of the steel pipe body 100 is prevented from leaking out through the other end.

As shown in Figure 6 and 7, the straight hole grouting simultaneous injection steel pipe according to the present invention having the configuration as described above to ensure that the inside of the steel pipe is correctly partitioned into a plurality of spaces to ensure that the grouting is properly performed by each compartment The construction is made, and a separate bit is provided at the end of the steel pipe body so that the grouting is made immediately after drilling the ground using the steel pipe body itself, so that easy and quick construction can be made.

Since the above has just been described with respect to some of the preferred embodiments that can be implemented by the present invention, as is well known the scope of the present invention should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

100: steel pipe body 110: grouting ball
200: inner packer 210: inner pipe
220: countercurrent blocking portion 221: inner fixing plate
222: outer pressure plate 223: the order
224: compression bolt 225: nut
300: first injection pipe 310: injection hole
400: second injection pipe 410: blowout
500: bit 600: cover member

Claims (8)

As a perforated grouting simultaneous injection steel pipe to reinforce the ground by perforating the ground to allow penetration into the ground and grouting,
A steel pipe body 100 formed in a tubular shape and inserted into the ground and formed to penetrate a plurality of grouting holes 110 on an outer surface thereof;
An inner packer (200) installed in the steel pipe body (100) to be spaced apart at regular intervals along the longitudinal direction of the steel pipe body (100) to partition an inner space;
Installed inside the steel pipe body 100 to allow the grouting liquid to be injected into the inner packer 200 to partition the inner space of the steel pipe body 100 and communicate with the inner packer 200 on an outer surface. A plurality of first injection pipes 300 having injection holes 310 formed therethrough;
After the grouting liquid is filled into the partitioned inner space of the steel pipe body 100, the grouting liquid is ejected to the outside of the steel pipe body 100 through the grouting hole 110 to perform grouting. A second injection pipe 400 through which a blow hole 410 communicating with the through hole is formed;
A bit 500 provided at one end of the steel pipe body 100 so as to perforate the ground; Including,
The inner packer 200 has a plurality of discharge holes penetrating through the side thereof, and the inner and outer pipes 210 are formed in front and rear sides thereof, and the front and rear sides of the inner pipes are inserted into and closed at both sides. The reverse flow blocking part 220 has a through hole formed in the plate surface so that the first injection pipe 300 and the second injection pipe 400 pass, and both ends of the inner pipe 210 are fastened by the tightening band 231. It is provided to be tightened when the grouting liquid is filled therein is in close contact with the inner surface of the steel pipe body 100 includes an inner packer material 230 to partition the inner space,
The reverse flow blocking unit 220 is disposed to face each other, and the inner fixing plate 221 and the outer pressing plate 222 disposed on the inner side and the outer side of the inner pipe 210, and the inner fixing plate 221 and the outer pressing plate ( 222 is provided between the water repellent member 223 and the outer surface of the first injection pipe 300 and the second injection pipe 400, the inner fixing plate 221, the water repellent material 223 and the outer pressure plate ( Compression bolt 224 penetrating through the 222, and the nut 225 is fastened to the end of the compression bolt 224 to the inner fixing plate 221 and the outer pressure plate 222 to press the order member 223. Straight boring grouting simultaneous injection steel pipe, characterized in that including a. delete delete The method of claim 1,
The diameter of the inner fixing plate 221 is formed to the same diameter as the inner diameter of the inner pipe 210, the diameter of the outer pressure plate 222 is characterized in that the diameter is formed larger than the diameter of the inner fixing plate 221. Direct injection grouting simultaneous injection steel pipe. The method of claim 1,
The first injection pipe 300 is provided with a plurality, but are formed to have a different length, respectively, the first injection pipe 300 having a relatively short length of the inner packer 200 is disposed in the area close to the excavation surface The grouting liquid is injected into the inside and the first injection pipe 300 having a relatively long length is characterized in that the grouting liquid is injected into the interior of the inner packer 200 disposed in the distant region from the excavation surface. Straight hole grouting simultaneous injection steel pipe. The method of claim 1,
The second injection pipe 400 is provided with a plurality, each formed to have a different length, the second injection pipe 400 having a relatively short length is injected with the grouting liquid into the inner space formed in the area close to the excavation surface And a second injection pipe 400 having a relatively long length so that the grouting liquid is injected into the inner space formed in the distant region from the excavation surface. The method of claim 1,
The inner packer 200 is increased in volume so that the inner surface and both sides of the steel pipe body 100 is in close contact when the grouting liquid is injected through the first injection pipe 300 to increase the internal space of the steel pipe body 100. Direct drilling grouting simultaneous injection steel pipe, characterized in that formed by geosynthetic partitions. The method according to any one of claims 1 and 4 to 7,
The other end of the steel pipe body 100 is provided with a bit 500, the other end of the opposite side is provided with a separate cover member 600 for closing the opening of the opened steel pipe body 100 Direct drilling grouting simultaneous injection steel pipe, characterized in that.

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