KR20130116444A - Guid apparatus for soil nail of reinforcing a slope - Google Patents

Abstract

The present invention relates to a ground reinforcement method using an integral fixing agent (reinforcement tool), and more particularly, a load-bearing body in a free field and a stranded wire consisting of an anchor fixing agent having increased pull resistance and a strand wire fixed to the anchor fixing agent. It is installed in the drilled hole drilled in the ground to increase the tensile force by the fixing agent to increase the stability rate of the ground as much as possible.In the case of large-scale soil deformation or earthquake, the length of free grout increases as the length of free grout increases. The ground reinforcement method to minimize the crack

Description

Integral fixation nail reinforcement tool and ground reinforcement method using same {Guid Apparatus for Soil Nail of reinforcing a slope}

The present invention relates to a ground reinforcement method using an integral fixing agent (reinforcement tool), and more particularly, a load-bearing body in a free field and a stranded wire consisting of an anchor fixing agent having increased pull resistance and a strand wire fixed to the anchor fixing agent. It is installed in the drilled hole drilled in the ground to increase the tensile force by the fixing agent to increase the stability rate of the ground as much as possible.In the case of large-scale soil deformation or earthquake, the length of free grout increases as the length of free grout increases. The present invention relates to a ground reinforcement method to minimize cracks.

As the industry develops, it is inevitable to develop steep slopes such as mountainous areas through the construction of complexes, construction of new towns, roads and railways, etc. Therefore, construction efficiency, economic feasibility and environment can be improved while increasing the utilization of land and securing stability and comfort of residential complexes. It is required to establish a slope stabilization method that can satisfy the integrity.

Therefore, the nailing method injects the grouting material around the reinforcement (nail) inserted into the ground, and based on the basic concept that the soil itself acts like a retaining wall in which the soil of the area reinforced by itself is integrated, and the earth wall of the excavated surface As a sieve (retaining wall and cladding) structure, it has advantages in terms of speed and economy compared to other methods in terms of the use of light equipment, and has been widely studied in the UK, France, Germany, Australia, USA and Korea. Ground reinforcement method that is currently used in many.

In the nailing method, the reinforcing effect of the nail is determined by the frictional force between the nail itself and the grouting material and the ground, or the frictional force between the nail and the grouting material. As a result, when the nail is stretched, In the ring method, a space has been attached to the nail to locate the nail at the center of the hole.

The spacer mounted at the tip of the nail plays an important role in maximizing the reinforcing effect of the nail by placing the nail at the center of the drilled hole so that the grouting material is uniformly injected into the drilled hole.

Referring to the drawings with reference to Figure 1 is a view showing a nail equipped with a space having only a function to position the conventional nail in the center of the hole and ground reinforcement method using the same.

Conventionally, as shown in Figure 1 is made of a rubber material or plastic, or those made by inflating the center by cutting the plastic tube.

Since the space is made of rubber or plastic material, the binding wire is tied to the nail with a wire or plastic string at the part where both ends are attached together with the grouting injection tube, so the string is not easily loosened or broken. As a result, the space as well as the grouting infusion tube caused a problem of leaving the normal position. In addition, when inserted into the drilling hole (H), the rubber material projections or the buffy portion of the plastic center is pressed by the nail weight on the lower surface of the hole does not sufficiently exert the problem of removing the role.

On the other hand, in addition to the reinforcement method described above, all the construction methods take the method of reinforcing only before construction, and there is no method of checking after construction, and the problem that an accident occurs due to the change of earth pressure in the ground cannot be prevented beforehand. have.

In order to make up for the disadvantages of the construction method as described above, a construction method using the integrated fixing nail anchor structure of Patent No. 909877 filed by the applicant of the present application has been proposed.

The patent of the applicant of the present application is an integral fixation nail that can be used as a tension member by integrating the anchor to the nail so as to secure the fixing force of the nail that gives tension to the shear stress and the vertical stress inside the slope and to install a strand wire at the rear end of the anchor An anchor structure was provided.

The above patent has the advantage that the tensile strength is increased due to the reinforcement ball, but the length of the strand is not twisted if the length of the long strand is twisted because the length of the strand is a tensile material is installed according to the length of the drill hole, the length of the grout does not increase There is this.

In addition, after the injection of grout into the drilling hole, the pressure plate is installed to closely adhere to the ground, and the strand is tensioned. Therefore, when the strand is twisted, the tension is not properly achieved. Therefore, the length of the grout depends on the closed end where the strand, the free field under compression, does not substantially increase. There is an advantage that can not achieve the desired purpose to minimize the tensile cracking at the time of tensile cracking.

In addition, in the case of tensioning the strand when injecting the grout, construct the grout without injecting the grout, and install the acupressure plate and finish the tension line after tensioning the grout, so that there is a lot of empty space between the acupressure plate and the hole. Is there.

The present invention has been proposed to solve the above problems in view of the above problems, and an object of the present invention; It is designed to be strong in the case of large-scale soil deformation or earthquake by increasing the pull-out resistance of anchor fixing agent, and to increase the tension of the fixing agent to make maximum contact with the wall of perforation hole to show the maximum shear and tensile force (pulling force). The purpose is to provide a reinforcement method.

Another object of the present invention is to install the spacer at equal intervals when fixing the strands to prevent twisting of the strands to be installed in the drill hole to increase the length of the grout subjected to the compressive force as the free field (strands) is precisely increased Its purpose is to provide a construction method that minimizes tensile cracking.

It is another object of the present invention to provide a construction method for the final filling of the filler after the tension of the strand by drilling the injection hole in the acupressure plate to provide a construction method that can be completely filled without a space between the drilling hole and the acupressure plate The purpose is to.

The present invention for solving the above problems and the drilling step of drilling a hole in the slope or ground; A fixing agent construction step of connecting the fixed head and the reinforcement tool; A free field connecting step of connecting the fixing agent and the strand; A spacer member fixing step of fixing the spacer member (loading body) at equal intervals in the strand; An injection step of inserting an anchor body into the drilling hole and injecting grout into the drilling hole; A tensioning step of tensioning the strand by installing acupressure plate at the rear end of the strand; A filling step of filling the filler through an injection hole drilled in the pressure plate; Characterized in the construction method consisting of a fixing step of fixing the protective cap.

The spacer is configured to penetrate the strand to secure the connecting band so that the spacer is fixed at a certain position to the outer peripheral surface of the strand, so that the strand is held upright in the axial direction to maximize the shear or tensile force (pulling force) to the effect of the three stone trillion. It is characterized in that the provision.

In addition, the acupressure plate is filled to fill the space between the pressure plate and the perforation hole by filling the injection hole for filling in the center to fill the through hole through which the strand wire penetrates to fill the filler through the perforated injection hole. It features.

According to the ground reinforcement method according to the present invention, consisting of an anchor fixing agent with an increased pull resistance and a strand wire fixed to the anchor fixing agent to increase the tensile force by the fixing agent to maximize the stability of the internal ground as possible, large-scale ground deformation In the event of an earthquake, as the free field increases, the length of the compressed grout also increases, minimizing the tensile cracking.

In addition, when the strand is fixed, the spacer is fixed to prevent twisting of the strand so that free extension of the field is good, thus minimizing tensile cracking.

In addition, the final filling of the filling material through the injection hole perforated on the pressure plate, and thus the construction can be completed in a perfect finish state.

1 is a flow chart of a conventional nail nail construction,
Figure 2 is an exploded perspective view of the integral fixing nail reinforcement of the present invention.
Figure 3 is a detailed view of the present invention constructed in the drilling hole.
4 is a sectional view taken along the line AA in Fig.
5 is a cross-sectional view of a state in which the pressure plate is coupled.
Figure 6 is a comparative experiment of the anchor using a general anchor and reinforcement.
7 is a plan view of the pressure plate.
8 is a construction step flowchart.

Hereinafter, with reference to the accompanying drawings to explain the specific construction method of the present invention.

First, a detailed description will be given with reference to FIGS. 2 to 6.

For reference, in the drawings of the present invention for the same configuration as the conventional configuration the same name and the same reference numerals, and detailed description thereof will be omitted.

Ground reinforcement method using an integral fixing agent according to the present invention, the grounding step of drilling a hole in the slope or ground; A fixing agent fixing step of connecting the fixing head and the reinforcing tool; A free field connecting step of connecting the fixing agent and the strand; A spacer member fixing step of fixing the spacer member (loading body) at equal intervals in the strand; Inserting the anchor body into the drilling hole and injecting the grout into the drilling hole; A tensioning step of tensioning the strand by installing acupressure plate at the rear end of the strand; A filling step of filling the filler through an injection hole drilled in the pressure plate; It consists of a construction method consisting of a fixing step of fixing the protective cap.

As a result, the present invention and the fixing agent fixing step (S1) for connecting the fixing head and the reinforcement; Free field connection step (S2) for connecting while fixing the spacer to the strand when connecting the strand to the fixing agent; Inserting step (S3) for injecting the grout by inserting the anchor body in the drilling hole; A tensioning step (S4) for tensioning the strand by installing a pressure plate at the rear end of the strand; It consists of a filling step (S5) for filling the filler through the injection hole punched in the pressure plate, the method features of the present invention by the above method is as follows.

As shown in FIGS. 2 and 3, the reinforcing tool B is connected to the reinforcing tool B and the fixed head A at the first and second fixing stages S1 through at least one through the width direction. A fixed head connecting bar 50 formed with a ball 51; The inner diameters of the fixed head connecting bars 50 are opposed to each other with their centers facing each other, and are closely formed along the outer diameter curvature of the fixed head connecting bars 50, each having a semicircular shape, and the fixed head connecting bars 50. First and second body parts 60a and 60b having fastening holes 65 formed therein corresponding to each other in the through hole 51 of the through holes 51; The first and second body parts 60a and 60b are fastened through the fastening holes 65 and the through holes 51 in a state in which the first and second body parts 60a and 60b are in close contact with the fixed head connecting bar 50. , 60b is composed of fastening members for integrally fixing the fixed head connection bar (50).

The first and second body parts 60a and 60b, that is, the fixed head 24 has a plurality of twisting wire coupling grooves 73 drilled therein, and a coupling hole 81 for supporting the strand wire 80 in the coupling groove. The fixing cap 83 is formed.

The strand wire 80 coupled to the coupling groove 73 drilled in the fixed head 24 is different depending on the drilling hole H, that is, the condition of the ground, but is formed to have a length of about D = 100 or more, and when forming the strand wire The spacer 26 is fixed at equal intervals in order to prevent twisting of the strands every middle.

The spacer is formed in the shape of a disk, and according to the diameter of the strand wire, the strand wire insertion groove 28 is radially drilled in the center of the disk so that the strand 80 can be straightly coupled.

In this case, when the spacer is fixed, the injection hose is fixed at the same time and the fastening band 100 is fixed to the left and right of the spacer so that the spacer does not leave at random so that the fixing of the strand and the spacer does not move.

The fastening band 100 is made of a known metal material, and is used to fix the plurality of spacers 26 to the outer circumferential surface of the strand 80.

As such, the step of fixing the reinforcing sphere and the stranded wire and then inserting it into the drilling hole.

When the reinforcing balls having integral strands are inserted into the drilling holes H drilled on the slope 1 as shown in FIG. 3, the first and second body parts 60a and 60b constituting the reinforcing balls are drill holes H. The reinforcement protrusions protrude in the opposite direction to be inserted into the surface, thereby increasing the frictional force with the ground, thereby increasing the resistance to the vertical stress and the shear stress.

When the reinforcement is inserted, the strand 80 is fixed to the rear end of the reinforcement, and the spacer is fixed to the strand, so that the strand is inserted in a straight line without twisting the strand.

After reaching the desired depth after inserting the anchor body (strengthening and stranded wire) into the drilling hole, the grouting injection step is performed, and when the grouting is cured, the drilling hole (H) is closed and fixed. The closing of the drilling hole (H) may use the pressure plate 500 in a conventional manner.

That is, the injection hole 70 is drilled in the center to close the drilling hole H, and the pressure plate 500 in which the strand wire through hole 72 is drilled radially on the outer circumferential surface of the injection hole is installed so that the strand wire 80 penetrates. Then, using the anti-loosening nut, the pressure plate is fixed to the perforated surface while fixing the strand.

The fixing unit 95 is further provided above the pressure plate 500. The fixing unit 95 is provided with a fixing nut (not shown) for fixing the strand 80 to the pressure plate 500 to provide a compressive force relative to the slope so that the strand 80 cannot be restored.

When the bulb is formed by curing the grout in the hole H, the pressure plate 500 and the fixing unit 95 are installed at the rear end of the strand 80 to fix the strand 80 and perform tensioning.

For reference, the tension is performed by rotating a fixing nut for fixing the strand 80 to the pressure plate 500 with a wrench (not shown). At this time, as the number of rotation of the fixing nut increases, the tension of the strand 80 increases, thereby providing a lot of tension.

For this reason, the strand 80 gives tension to the unstable ground, and aims at stability of the ground. That is, the nail supports the vertical stress and the shear stress of the slope by the reaction force generated by the tension at the inlet side and the inner side of the drilling hole H and the reaction force of the nail and the anchor by the action of the strand 80.

Filling material is injected into the injection hole 70 installed in the pressure plate after the tension of the strand. Filler is selected according to the ground such as urethane, mortar, etc. to completely fill the space between the pressure plate and the perforation hole.

The construction method according to the present invention has the following effects.

First, the fixing force is increased between the reinforcing tool and the ground by the reinforcing tool consisting of the first and second body parts 60a and 60b, so that the slope can be stably supported as compared with the conventional ground reinforcing method.

In the ground reinforcement method of the present invention, as shown in Figure 6, the general anchor body showed a load-displacement curve with time of 0.085 KN, but the ground reinforcement method of the present invention showed a maximum load at 0.144 KN.

It can be seen that the performance of the present invention is improved by 170%.

Second, the length of the grout, which is subjected to the compressive force due to the increase in the actual free field, is also increased as compared to the conventional drilling method, thereby minimizing the tensile cracking.

Third, the tension required by the design specification can be applied to all nails. That is, it is specified that the current specifications should be stamped 50-100 balls per ball, but this can not be 100% confidence in slope stability by the sample test. However, reinforcing tools equipped with stranded wires can have the best quality construction by increasing the friction between the reinforcement and the ground.

Fourth, by fixing the spacer to the strand, which is a substantially free field, it is possible to at the same time maximize the tension (pulling resistance) required for the slope stability as well as to prevent the twist and the role of the correct spacer member.

Fifth, since filling the filling material through the injection hole perforated on the pressure plate to eliminate the space generated in the pressure plate and the hole is more effective in slope stability.

The present invention is not limited only to the above-described embodiments, but may be modified and modified without departing from the scope of the present invention, and the technical spirit to which such modifications and variations are applied should also be regarded as belonging to the following claims. .

A: reinforcement B: fixed head
1: slope 26: spacer

Claims (5)

In the reinforcement for slope reinforcement for inserting the reinforcement ball fixed to the strand in the perforated hole (H) drilled on the slope, the role of the spacer member as well as performing the role of the gap member while preventing the twisting of the strand in each middle when fixing the strand 80 Integral fixation nail reinforcement, characterized in that the strands (80) to be fixed at equal intervals to maximize the tensile force required for stabilization so that the strands (80) can be straightly combined. The method according to claim 1, wherein the spacer member is configured in the shape of a disk and the radial strands in the center of the disk according to the diameter of the strand wire insertion grooves 28 to be configured so that the strands 80 can be straightly coupled to the straight line, Integral fixing nail reinforcement, characterized in that the fastening band 100 is fixed to the left and right so that the fixing of the strand and the spacer does not move. The method according to claim 1, the injection hole 70 is drilled in the center to the size to close the drilling hole (H) and the pressure plate (500) in which the strand wire through hole 72 is drilled radially on the outer peripheral surface of the injection hole (80) It is installed so as to penetrate and fixed the strand while keeping the pressure plate in close contact with the perforated surface using an anti-loosening nut and injecting filler through the injection hole 70 to strengthen the integrated fixing nail, characterized in that the space between the pressure plate and the perforation hole very much phrase. A drilling step of drilling a hole in a slope or ground; Fixing fixing step of connecting the fixed head and the reinforcement; A free field connecting step connecting the fixing agent and the strand; Spacer fixing step for fixing the spacer (loading body) at equal intervals in the strand; An injection step of inserting the anchor body into the drilling hole and injecting the grout into the drilling hole; A tensioning step of tensioning the strand by installing acupressure plate at the rear end of the strand; A filling step of filling the filler through an injection hole drilled in the pressure plate; Ground reinforcement method using an integral fixing nail reinforcement consisting of a fixing step of fixing a protective cap. 5. The method of claim 4, wherein the spacer is fixed to the strand, which is a substantially free field, to prevent twisting and precisely perform the role of the spacer member, and at the same time maximize the tensile force (pulling resistance) required for slope stability. Ground reinforcement method using an integral fixation nail reinforcement tool.

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