KR101018890B1 - Grouting method utilizing anchor apparatus for direct-boring - Google Patents

Abstract

PURPOSE: A construction method using a soil nail device for simultaneously boring and inserting an anchor body and a nail body with an anchor function is provided to reduce construction time by directly injecting concrete after a borehole is formed. CONSTITUTION: A construction method using a soil nail device for simultaneously boring and inserting an anchor body and a nail body with an anchor function is as follows. A rod(12) with a bit(20) is installed in the head of a boring machine. A borehole(50) is formed in the ground using the boring machine. Concrete is injected into an injection pipe using a concrete injection device. The borehole is filled with the concrete injected through a discharge port(21) of the bit. The injected concrete is hardened. A pressure plate(25) is inserted into the end of the nut.

Description

Application method using small nail device that inserts anchoring agent and nail body with puncture at the same time {grouting method utilizing anchor apparatus for direct-boring}

The present invention relates to a small nail device and a construction method for inserting the anchoring agent and nail body at the same time as the puncture, and more specifically, to reinforce and ground strength to stabilize the excavation wall or slope The present invention relates to a construction method using a small nail device for inserting the anchoring function and the nail body at the same time as the puncture.

Generally, cement grouting method and compact grouting method are used to reinforce the bearing capacity of the soft ground when constructing civil-related facilities such as reinforcement of natural excavation, earthquake, railway and road, underground structures and tunnels. The construction method, earth anchor method, micro pile method, screw auger pile method, steel pipe press method is typical. These methods are constructed using a pneumatic hammer during the drilling and are methods that can cause severe soil variation in the drilling diameter due to strong air pressure during drilling.

The cement grouting method is a method of injecting cement milk as a whole on the bottom of the foundation, but the construction cost is low, but it is difficult to control the flow of grouting liquid in the ground and cannot be applied to clay ground. In addition, long-term reliability due to groundwater is insufficient. The compaction grouting method is a method of forming cement mortar piles by injecting cement mortar at a high pressure. The compact grouting method is accompanied by a problem in that long term durability is insufficient along with a problem that the degree of injection of cement mortar injected into the ground cannot be confirmed.

The steel pipe press-fit method is a method of forcibly pushing-in a steel pipe by using a propulsion device. In addition, there is a risk of damaging the existing structure in the process of forcibly pushing the steel pipe by using a support such as a hydraulic jack, and it is difficult to apply to a small structure. There is a limit.

The small nail method or the micro pile method is a method of drilling the ground first using a perforator, and then inserting the strand or micro pile, then grouting and fixing them. These methods have superior reinforcement quality compared to the grouting method described above. Can be secured. However, it is not only a two-step process, namely, first perforation and second post-insertion, but also a workaround or cost increase because the drilling work must be performed while inserting a casing to prevent sedimentation into the perforation hole. There is this.

In particular, the representative soil nailing method of the earth anchoring method inserts an anchor body for oil nailing inserted into the pouring hole after drilling the pouring hole separately and grouts the concrete. The fastening force with the grouted concrete is relatively weak, and as described above, the workability is very poor. In other words, the concrete injected into the pouring hole as the anchor body is not completely injected into the crack or uneven inner surface formed on the inner circumferential surface of the pouring hole, the bonding force with the base ground is reduced. In addition, since the pour hole is formed by using a perforator, and an anchor body manufactured separately is inserted therein, the number of working steps increases, and the workability decreases.

In view of this point, Korean Unexamined Patent Publication No. 1997-0027550 discloses a direct drilling steel pipe reinforcement type multi-stage grouting construction method and a direct drilling apparatus, and Patent Registration No. 0919628 expands and contracts an excavated surface equipped with a cemented carbide tip. A drilling bit for a direct drilling device is disclosed, and Patent Registration No. 0899621 discloses a direct drilling double steel pipe grouting method.

The present invention can increase the reinforcing force to support and reinforce the ground by increasing the fastening force of the grouted concrete and the ground and the grouting concrete and the grouting concrete, and greatly improves the construction properties according to construction It is an object of the present invention to provide a construction method using a small nail device that inserts a fixing agent and a nail body to which the reducing anchor function is added at the same time as the drilling.

Another object of the present invention is to use the anchor hydraulic hammer during the drilling operation is possible to work with a small air pressure during drilling, the anchoring agent is added to the anchor function to reduce the change in the internal soil diameter due to the low-pressure air It is to provide a construction method using a small nail device for inserting at the same time with the integral.

Still another object of the present invention is to provide a construction method using a nail clip device which simultaneously inserts a fixing agent and a nail body to which an anchor function is formed, in which a bit and a rod for performing a punching work form an anchor.

Another object of the present invention is to inject concrete through the rod and bit (fixing agent) of the anchor body, so that the construction is improved in the soil that is severely collapsed and the hole is not well formed after drilling, It is to provide a construction method using a small nail device to insert a fixing agent and a nail body at the same time as the puncture is added to the anchor function to continuously press the concrete to increase the bonding strength of the ground and concrete after injection.

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In order to achieve the above object, a construction method using a nail clip device for inserting an anchor function and a nail body according to the present invention simultaneously with puncturing is connected to a bit having a plurality of discharge holes formed at an end thereof, and having a hollow portion. A perforation step of mounting the head to the perforation apparatus to form a direct perforation, and installing a packer unit at the end of the rod in a state where the bit and the rod are inserted into the perforation, and blocking the entrance of the rod, and the hollow of the rod. The concrete injection step to press the concrete through the portion to fill the concrete through the perforated through the discharge hole of the hollow portion and the bit, and remove the packer unit in the state that the injected concrete is hardened and acupressure plate at the end of the rod It characterized by that including the acupressure plate installation step of installing the.

In the present invention, in the drilling step is provided with a connecting step for connecting the rod by using the coupling, the inlet blocking step is coupled to the rod and the boss member located in the direct hole and the inlet side is coupled with the rod Further comprising a coupling step, a blocking pack expansion step of expanding the blocking pack by injecting air into the blocking pack is installed on the outer peripheral surface of the boss member to block the inlet of the direct hole.

The present invention has a construction method using a small nail device to insert the anchoring function and the nail body at the same time with the puncture has the following effects.

First, it is possible to improve the workability in soil that is not well formed after drilling, because the collapse of the direct drilling is severe.

Second, when the long depth of the soil layer is drilled, the construction period can be shortened by simultaneously injecting concrete, which is an injection after drilling.

Third, it is possible to increase the binding force with the base when the concrete is injected into the direct drilling. After the formation of the direct hole, concrete is injected through the rod for forming the direct hole, and the inlet of the direct hole can be blocked by using a packer unit having elastic force, so that the pressure of the concrete injected into the direct hole can be increased, so that the crack of the ground plate and It can activate the injection of concrete into the uneven space.

Fourth, it is eco-friendly because dust can be reduced during drilling.

Fifth, it is not necessary to withdraw the rod inserted in the direct hole can reduce the construction space.

1 is a cross-sectional view showing a state in which a nail salon device for inserting the anchor and the nail body added at the same time the anchor function according to the present invention is constructed,
2 is a cross-sectional view showing a state in which the notch is formed on the rod,
Figure 3 is a side view of a partial ablation showing a state in which a check valve unit is installed on the coupling,
4 is a cross-sectional view showing a state in which a packer unit is installed in a direct hole;
5 is a perspective view of a packer unit,
6 is a cross-sectional view of the packer unit,
7 is a cross-sectional view showing a drilling step of constructing a direct drilling anchor device using a mill factory;
8 is a cross-sectional view showing a state in which a rod is installed in the drilling device is mounted;
9 to 11 are cross-sectional views showing a construction method.

The small nail device (hereinafter referred to as the 'small nail device') for inserting the anchoring agent and nail body added with the anchor function of the present invention at the same time (hereinafter referred to as a 'soil nail device') is a reinforcement of natural and artificial slopes adjacent to railroads, roads, and port works, and underground In order to reinforce the bearing capacity of the structure to the soft ground during construction of construction and civil engineering-related facilities such as structures and tunnels, an embodiment is shown in Figures 1 and 3.

Referring to the drawings, the small nail device 10 is a bit and a rod for drilling a straight hole forms an anchor, the rod 12 having a hollow portion 11 in the longitudinal direction, and the end of the rod 12 Bits 20 and end portions of the rod 12 having a plurality of discharge holes 21 for discharging the concrete injected through the hollow formed in the rod 12 are formed in the excavated ground to excavate the ground And a pressure plate 25 and a fastening member 26 coupled to each other.

The rod 12 has a screw portion 13, a protrusion (not shown) is formed on the outer circumferential surface can increase the binding force with the concrete, which is an injection to be described later. The protrusions formed on the outer circumferential surface of the rod 12 may be continuously or discontinuously formed within a range in which interference does not occur during drilling. The protrusion may be manufactured separately and mounted on the rod 12.

In addition, the rod 12 may be provided with a notch 14 or a check valve unit 15 that may be damaged at a set pressure as shown in FIGS. The notch 14 may be formed by pressing a damaged part on the outer circumferential surface of the rod 12 to form a relatively thin thickness. And the check valve unit 15 may be formed in the coupling 16 to interconnect the rods 12, the check valve unit 15 formed in the coupling 16 is the outer peripheral surface of the coupling 16 The valve housing 15a and the ball housing 15a supported by the spring 15b may be formed in the valve housing 15a.

The bit 20 is installed at the end of the rod 12 in which the hollow part 11 is formed, and discharge holes 21 communicating with the hollow part 11 are formed, and at the end thereof, a straight hole 50 is formed. Tips 22 for puncturing of are formed. Here, the diameter of the bit 20 is formed larger than the diameter of the rod 12. The tip formed on the bit 20 may be modified in various forms according to rock, sand, limestone, lime, clay gravel layer, and the like.

In addition, the discharge holes 21 formed in the bit 20 are concrete discharged through the hollow part, and are formed on the lower surface and the outer circumferential surface, and the forming room of the discharge hole formed on the outer circumferential surface side is directly bored with the lower surface of the bit. It is formed alternately in the direction of the entrance of the perforation (see Figs. 1 and 9).

On the other hand, it is installed on the inlet side of the direct hole 50 formed by the bit connected to the rod, which is expanded by air to block the inlet of the direct hole so as to increase the injection pressure of the concrete injected into the direct hole 50 The packer unit 30 is further provided. The packer unit 30 is coupled to the rod 12, the boss member 31 is located in the direct hole 50 and the inlet side, and installed on the outer circumferential surface of the boss member 31 is expanded or pneumatically Blocking pack 32 is contracted when the discharge of the, and is installed in the boss member 31 and the pipe member 33 for inflating the blocking pack 32 by injecting air supplied from the compressor to the blocking pack 32 and And a valve 34 installed on the pipe member 33.

The boss member 31 has a female thread portion 31b formed at the main body 31a which is screwed to the end of the rod 12, and flange portions 31c and 31c for supporting the blocking pack 32 at both sides thereof. Each is formed.

The blocking pack 32 is formed in a tube shape, and both end portions thereof are fixed to both flange portions 31c and 31c, respectively. The blocking pack 32 may be formed of an elastic layer 32a that is stretched and contracted by pneumatic pressure, and a reinforcement layer 32b formed on an outer circumferential surface of the elastic layer 32a. The stretchable layer may be made of a rubber material, and the reinforcement layer may be made of a stretchable nonwoven fabric or a metal mesh.

Referring to the operation of the small nail device 10 configured as described above and the construction method using the same as follows.

In order to reinforce the soft ground of civil engineering and construction work such as reinforcing cutouts such as road construction, port construction, etc., the rod 12 having the bit 20 installed at the end is mounted to the head portion 101 of the drilling device 100. And performs a drilling step of drilling the perforation 50 in the ground.

As shown in FIG. 7 and FIG. 8, the drilling step rotates and advances the rod 12 on which the bit 20 is mounted using the head 101. And by supplying a high pressure air through the hollow portion 11 of the rod 12 and the discharge hole 21 of the bit 20 to excavate excavated soil generated during the drilling of the direct hole (50). The head portion 101 is provided with a rod 12 is fixed to the support shaft 102 for rotating it, and a rotary joint 103 installed on the outer peripheral surface of the support shaft. The rotary joint 103 is connected to the injection pipe 104 connected to the concrete injection device 200. The check valve 106 is installed in the injection pipe. Although not shown in the drawings, the head portion is provided with a supply hole for supplying air pressure to the hollow portion of the bit during the drilling of the direct hole. Therefore, in the drilling step it is possible to supply a continuous pneumatic to the hollow portion of the bit through the supply hole.

As the depth of direct drilling increases in the drilling step, the rods 12 are connected by using a coupling. At this time, since a check valve is installed on the injection injection side of the rotary joint installed in the head, air can be prevented from flowing back to the injection injection side.

As described above, when the perforation of the direct perforation is completed by the perforation step, the injection injection step of injecting the concrete, which is the injection, is performed through the injection injection pipe.

The injection step of injecting the concrete by using the concrete injection device 200 is supplied to the injection pipe (104). The concrete injected into the concrete injection pipe is injected into the direct hole through the discharge port 21 of the bit 20 of the hollow portion 11 of the rod 12 to be filled from the lower side of the direct hole 50 to the inlet side. .

At this time, the shank valve unit 15 is installed in the notch 14 or the coupling 16 in the rod 12, so that when the concrete pressure in the hollow part 11 increases, the shank installed in the notch or coupling is installed. The concrete is discharged through the valve unit to facilitate the concrete injection into the direct hole (50).

As described above, when the injection of the concrete is completed, the pressure plate 25 is inserted into the end portion of the rod 12 in the state where the injected concrete is cured, and the pressure plate installation step of fastening the nut is performed.

On the other hand, as described above in the construction of a permanent earth anchor device, or pressurized construction to press the concrete injected into the direct drilling in the process of soil nailing (soil nailing) construction as shown in FIG. The inlet blocking step of blocking and installing a packer unit at the end of the rod while the bit and the rod are inserted is performed.

The inlet blocking step is coupled to the rod 12, the coupling step for coupling the boss member positioned in the direct hole 50 and the inlet side with the rod, and by injecting air into the blocking pack installed on the outer peripheral surface of the boss member The expansion of the pack further includes a blocking pack expansion step of blocking the inlet of the direct hole (50).

As described above, when the injecting concrete in the state of blocking the inlet of the direct hole, the concrete 400 filled in the direct hole 50 is not discharged to the inlet side of the direct hole 50, so the injection of concrete Can increase the pressure. The increase in the injection pressure of the concrete injected into the direct hole can increase the binding force between the base and the grouted concrete by allowing the concrete to be injected into the cracks or voids formed in the inner circumferential surface of the direct hole 50.

As described above, the construction method using the small nail device of the present invention directly drills direct drilling for reinforcing the soft ground directly using the bits and rods, and the drilling speed and construction since the rods and the bits act as anchors. It can raise the quality of construction and greatly reduce construction cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

The construction method using a small nail device for inserting the anchoring agent and nail body added with the anchor function of the present invention at the same time as the puncture is widely available for reinforcing cutouts such as tunnel, road construction, port construction.

Claims (5)

delete delete A drilling step of mounting a rod having a hollow portion on a support shaft of a perforator head having a rotary joint connected by a concrete injection device and an injection pipe, and mounting a bit at an end of the rod to form a straight hole;
The inlet blocking step of installing the packer unit at the end of the rod in the state in which the bit and the rod is inserted into the direct hole and blocking the inlet, the inlet blocking step is coupled to the rod is a boss located at the inlet side Blocking the inlet of the direct hole by injecting air through the pipe member installed in the boss member in the blocking pack consisting of a coupling step for coupling the member with the rod, and the expansion layer and the reinforcing material layer surrounding the boss member on both sides of the boss member It is provided with a blocking pack expansion step,
Injecting concrete through the hollow portion of the injection pipe, the rotary joint and the rod in the state of the completion of the drilling concrete injection step so that the concrete is filled in the perforated direct hole by being discharged through the discharge hole of the bit;
And a pressure plate installation step of installing a pressure plate at the end of the rod in the state where the injected concrete is cured.
In the concrete injection step, anchoring function is added, characterized in that the notch portion formed in the rod is broken at the set pressure when the concrete is injected through the hollow portion of the rod to be injected into the concrete concrete injection Construction method using a small nail device that inserts the agent and nail body at the same time as the puncture. delete delete

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