KR101043127B1 - Device and method for reinforcing the ground using pc twisted steel wire - Google Patents

Abstract

The present invention relates to a ground reinforcement method and a ground reinforcement device using a PC strand, the PC strand to form at least one bulb (protrusion), at least one diameter wing that is fixed to one end of the PC strand is open by elastic springs It is provided with a diaphragm fixture having a diameter, the other end of the PC strand is penetrated, a pressure plate for fixing the periphery of the perforated hole inlet and a fastening device for fastening the pressure plate and the PC strand in a state where the PC strand is tensioned. Including, through the fixing technology using the material characteristics and elastic force of the PC strand can reduce the risk of ground sag or collapse, it is possible to improve the efficiency of the support as well as easy operation.

PC Strand, Rock Bolt, Soil Nailing, Pre-stress

Description

Ground reinforcement method and ground reinforcement device using PC strands {DEVICE AND METHOD FOR REINFORCING THE GROUND USING PC TWISTED STEEL WIRE}

The present invention relates to a ground reinforcement method and a ground reinforcement device using a PC strand, more specifically using a PC strand wire excellent in elasticity and flexibility as a main material of the rock bolt method and the Soil Nailing method, as well as light and easy to work The present invention relates to the ground reinforcement method and ground reinforcement device using PC strands that can improve the ground reinforcement efficiency by reducing the risk of ground sag or collapse through the fixing technology using the material characteristics and elastic force of PC strands.

In general, the excavation surface is prevented from collapsing in construction such as ground reinforcement, reinforcement of natural slopes and artificial slopes adjacent to building digs, railways and roads, construction of underground structures and tunnels, reinforcement of retaining walls, and installation. Ground reinforcement method is applied to

Specifically, Figure 1 shows an example of ground reinforcement method in the building trench, the slope adjacent to the road and the tunnel inner wall.

As shown in A and B of FIG. 1, the soil nailing method is used for ground reinforcement of slopes such as building digs and roads. Reinforce the excavation slope with the pressure plate.

1C is applied to the rock bolt method to ensure safety through the ground reinforcement of the tunnel inner wall. The rock bolt method drills a rock to a predetermined depth from the tunnel excavation surface, inserts the rock bolt body into the bored rock hole, inserts and fills mortar, and tightens the head of the rock bolt body with a pressure plate and a nut. It is a method of fixing. The rock bolt method used an all-screw type steel as the main material.

The rebar and all-screw type rebars used in the Soil Nailing and Rockbolt methods resulted in high weight per unit length and difficult processing, resulting in higher material costs.

In addition, in the case of the all-screw type reinforcing bar used in the rock bolting method, a safety fatal problem occurs that the rock bolt falls due to the weight of the reinforcing bar, and it is transported in a narrow space such as a tunnel due to the use of the straight bar. And difficulty in working. In addition, the straightness of the reinforcing bar can not adequately cope with the hole bending phenomenon occurring in the rock, delaying the work time, as well as the problem of reducing the working efficiency of workers.

In order to solve the problems as described above, the first object of the present invention is ground reinforcement using PC strands, which are light and easy to work ground using PC strands with excellent elasticity and flexibility as the main material of rock bolts and soil nailing method To provide a device.

It is a second object of the present invention to provide a ground reinforcement method that provides work convenience and improves work efficiency in ground reinforcement works such as tunnels, slopes and building breakers by using a ground reinforcement device using a PC strand as a ground reinforcement material. It is.

Ground reinforcement device using a PC strand in accordance with a first embodiment of the present invention to achieve the above object comprises a PC strand to form at least one bulb (protrusion); A diameter fixing member having at least one diameter expanding blade fixed to one end of the PC strand, and opened by an elastic spring; Acupressure plate is installed so that the other end of the PC strand is penetrated to fix the ground around the inlet of the drill hole; And a fastening device for fastening and fixing the pressure plate and the PC strand in the state where the PC strand is in tension.

In this case, the expanded diameter fixing body has a diameter larger than that of the PC strand, the fixing portion fixed to one end of the PC strand and the fixing unit hinged, and provided with at least one diameter wing that is open by the elastic spring. Characterized in that it comprises a magnifying portion.

Here, the enlarged diameter portion is characterized in that it further comprises an elastic ring to the outer circumferential surface of the at least one enlarged diameter wing.

Meanwhile, the ground reinforcement device using the PC strand may further include a guide rod formed in a cylindrical shape and having a locking jaw at its end.

The fastening device may include a wedge nut supporting the pressure plate and a wedge inserted into a space between the wedge nut and the PC strand, to fix the wedge nut and the PC strand. One side is cut to form an inclined surface, characterized in that the wedge nut is in close contact with the pressure plate by forming a hole in the pressure plate so that the cut portion of the wedge nut penetrates the pressure plate.

On the other hand, the fastening device is a fastening bolt for forming a groove to the one end portion of the PC strand passing through the pressure plate is inserted and coupled, the outer peripheral surface and the thread;

It may be configured in the form including a fastening nut for supporting the pressure plate by screwing with a screw thread formed on the outer peripheral surface of the fastening bolt. At this time, the fastening bolt may further include an insert in the groove is inserted into one end of the PC strand.

In another aspect, the fastening device is a fastening for supporting the pressure plate by screwing with a screw thread formed on the outer circumferential surface of the reinforcing bar and the connecting coupler and the PC coupler is inserted into and coupled to the reinforcing bar and the PC strand is inserted into the outer peripheral surface It characterized in that it comprises a nut, wherein the coupling coupler is screwed with the reinforcing bar, characterized in that the coupling by the PC strand and wedge.

Ground reinforcement device using a PC strand in accordance with a second embodiment of the present invention comprises a PC strand to form at least one bulb (protrusion); A diameter fixing member having at least one diameter expanding blade fixed to one end of the PC strand, and opened by an elastic spring; Acupressure plate is installed so that the other end of the PC strand is penetrated to fix the ground around the inlet of the drill hole; And a rubber plate formed at one side of the pressure plate to penetrate the PC strand, and inserted into the drilling hole to fix the pressure plate and to seal the drilling hole, and having a grouting hole in the pressure plate and the rubber plate. Ground reinforcement device using a PC strand, characterized in that.

Ground reinforcement device using a PC strand in accordance with a third embodiment of the present invention is PC strand; One end of the PC strand is inserted and fixed, and a fixture including an insert in a portion where the PC strand is inserted; Forming a hole through which the other end of the PC strand is penetrated, and supporting the pressure plate with a pressure plate and a wedge nut fixing the ground around the perforation hole inlet; and inserting a wedge into the space between the wedge nut and the PC strand; Includes; a fastening device for fixing the nut and the PC strand.

At this time, the wedge nut is cut so that one side forms an inclined surface, and a hole is formed in the pressure plate so that the cut portion of the wedge nut passes through the pressure plate so that the wedge nut is in close contact with the pressure plate at a predetermined angle. It is characterized by.

Ground reinforcement device using a PC strand in accordance with a fourth embodiment of the present invention is PC strand; One end of the PC strand is inserted and fixed, and a fixture including an insert in a portion where the PC strand is inserted; An acupressure plate forming a hole through which the other end of the PC strand is penetrated, and fixing the ground around the perforation hole inlet; A fastening bolt which forms a groove to which one end of the PC strand penetrates the pressure plate is inserted to be coupled and forms a thread on an outer circumferential surface thereof; And a fastening nut supporting the acupressure plate by screwing with a screw thread formed on an outer circumferential surface of the fastening bolt.

At this time, the fastening bolt is characterized in that it further comprises an insert in the groove to which one end of the PC strand is inserted and coupled.

Ground reinforcement device using a PC strand in accordance with a fifth embodiment of the present invention is PC strand; One end of the PC strand is inserted and fixed, and a fixture including an insert in a portion where the PC strand is inserted; Acupressure plate to form a hole, and to secure the ground around the perforation hole inlet; A coupling coupler for penetrating the hole of the acupressure plate and forming a thread on an outer circumferential surface thereof, and the PC strand is inserted into and coupled in both directions; And a fastening nut supporting the acupressure plate by screwing with a screw thread formed on an outer circumferential surface of the reinforcing bar.

At this time, the coupling coupler is screwed with the reinforcing bar, characterized in that the coupling by the PC strand and wedge.

On the other hand, the PC strand is characterized in that it forms at least one bulb (protrusion), and includes a pull-out safety spring at a predetermined position.

Ground reinforcement method using a PC strand in accordance with a sixth embodiment of the present invention comprises a step of drilling a ground to form a hole; Inserting a PC strand having a diameter-fixed fixture into a cylindrical guide rod into the drilling hole; 3 steps of drawing out the guide rod; Tensioning the PC strand and then fastening the PC strand and the pressure plate using a fastening device; And five steps of grouting through a grouting hole formed in the pressure plate.

The method may further include inserting the drawn guide rod to apply pressure to the diaphragm fixing body, wherein the diaphragm fixing body has a diameter larger than that of the PC strand, and is fixed to one end of the PC strand. Fixing unit; And an enlarged diameter portion hinged to the fixing unit and having at least one enlarged diameter wing that is opened by an elastic spring.

As described above, the ground reinforcement device using the PC strand according to the present invention has the effect of improving the ease of work and work efficiency due to the elasticity and flexibility of the material.

In addition, the ground reinforcement method and ground reinforcement device using the PC strand according to the present invention improves the ground reinforcement efficiency by reducing the risk of ground sag or collapse by generating a pre-stress using the material properties of the PC strand It is effective to let.

In addition, the ground reinforcement device using the PC strand according to the present invention has the effect of increasing the pull resistance and frictional force through various types of auxiliary devices to improve safety.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a view showing the configuration and installed state of the ground reinforcement device using a PC strand in accordance with a first embodiment of the present invention.

As shown in FIG. 2, the ground reinforcement device 100 using the PC strand is installed in the drilled hole 10 formed by excavating the ground and the rock, and the drilled hole 10 is filled with a filler such as cement milk or mortar. do.

The ground reinforcement device 100 using the PC strand is a PC diameter strand (110) formed on one end of the PC strand (110), PC strand (110), acupressure plate 160 is fastened to the other end of the PC strand (110), It includes a fastening device 170 and a guide rod 200 for fastening the pressure plate 160 to the PC strand (110), and additionally pulled out by increasing the pull resistance and frictional force of the ground reinforcement device 100 using a PC strand It may be further provided with a bulb (protrusion) 130, anti-pulling safety spring 140 and pin ring 150 to prevent.

The PC strand 110 may be formed by using one strand or combining a plurality of strands. In addition, the length of the PC strand 110 may vary depending on the depth of perforation formed by the excavation work.

The expanded fixing body 120 is ground so that the ground reinforcement device 100 using the PC strand wire is fixed and fixed even when the ground reinforcement device 100 using the PC strand wire is inserted into the drilled hole 10 and fixed. It plays a role. Therefore, it is possible to prevent the ground reinforcement device 100 using the PC strand in accordance with the tension before the filler is completely cured.

The expansion diameter fixing member 120 is hinged with the fixing unit 121 and the fixing unit 121 fixed to the PC strand wire 110 while the PC strand wire 110 penetrates and opens and is fixed to the inner wall of the drilling hole 122. After the ground reinforcement device 100 using the PC strand is inserted, the elastic ring 124 for fixing the diameter portion 122 until the diameter portion 122 is opened, and the diameter portion 122 can be opened. It includes an elastic spring 125 for applying an elastic force.

Specifically, the fixing unit 121 forms a hole through which the PC strand line 110 can penetrate in a form having a larger diameter than the PC strand line 110, and is fixed in a state where the PC strand line 110 penetrates. . The method of fixing the PC strands 110 may be applied in various ways. For example, the PC strands 110 and the fixing unit 121 may be fixed using the wedge 123 or the PC strands 110 may be crimped. Alternatively, the PC lecture line 110 may be fixed to the fixing unit 121 through various methods such as welding.

The fixing unit 121 is configured in a form in which a portion engaging with the enlarged diameter portion 122 is derived, and hinged with the enlarged diameter portion 122 in the derived portion. However, the fixing unit 121 and the enlarged diameter portion 122 may be applied in various ways as long as the enlarged diameter portion 122 may revolve around the coupling portion.

The enlarged diameter part 122 has a structure in which the hinge is engaged with the fixing part 121 and spreads out as it rotates around the coupling part. However, in order to enlarge the diameter portion 122, an elastic force is acted on, and the elastic force may occur using the elastic spring 125. The elastic spring 125 is not limited to the shape as shown, and various methods may be applied as long as the elastic spring 125 may generate an elastic force to unfold the enlarged diameter portion 122.

The enlarged diameter portion 122 serves to secure the expanded diameter wing to the inner wall of the hole. Accordingly, the diameter-expansion blades of the enlarged diameter part 122 may be formed in a pair of symmetrical pairs, and may be formed in a plurality of pairs around the PC strand 110. That is, the enlarged portion 122 is a concept that includes all of the respective diameter of the wing.

In addition, the enlarged diameter portion 122 may form a groove in which the elastic ring may be fixed. Therefore, the elastic ring is installed in the groove so that the enlarged diameter portion 122 does not open until the ground reinforcement device 100 using the PC strand is inserted into the drilling hole and fixed.

However, the elastic ring 124 is removed after the PC strand wire structure 100 is inserted in order to fix the diameter fixing unit 120. The way in which the elastic ring 124 can be removed can vary.

For example, as illustrated, the locking jaw 210 of the guide rod 200 may be used. Specifically, in the state where the ground reinforcement device 100 using the PC strand wire is inserted into the guide rod 200, the ground rod reinforcement device 100 using the guide rod 210 and the PC strand wire are inserted together in the hole. After insertion, the guide rod 200 is drawn out so that the diameter fixing unit 120 can be fixed. At this time, the guide rod 200 has a locking jaw 210 is formed, the locking jaw 210 in the drawing process removes the elastic ring 124 installed on the enlarged diameter portion 122 from the enlarged diameter portion 122. When the elastic ring 124 is removed and the guide rod 200 is drawn out of the enlarged diameter portion 122, the enlarged diameter portion 122 opens the enlarged diameter wing as shown in FIG. 3 by the elasticity of the elastic spring 125 to the inner wall of the hole. Settles down.

In addition, after the enlarged diameter portion 122 is fixed, the PC strand wire 110 is tensioned to check the fixation state, and in the case of further fixing, the guide rod 200, which is drawn, is inserted again to increase the diameter of the enlarged diameter portion 122. I can spread more wings.

In addition, the diaphragm fixing body 120 serves to fix one end of the PC strand (110) consisting of several strands to prevent the PC strand (110) from being released.

The pressure plate 160 forms a hole through which the PC strand line 110 can penetrate, such that the other end of the PC strand line 110 penetrates. The pressure plate 160 serves to fix the ground around the inlet of the drilling hole when the PC strand 110 is inserted into the drilling. In addition, if necessary, a pipe through hole (not shown) through which the pipe for injecting filler such as cement mortar may be formed in the pressure plate 160.

The fastening device 170 couples the pressure plate 160 and the PC strand 110 in such a manner that the pressure plate 160 is coupled with the PC strand 110 in the state where the PC strand 110 is tensioned. Detailed description of the fastening device will be further described with reference to FIGS. 7A to 7C.

The ground reinforcement device 100 using the PC strand may include various additional devices to increase the pullout resistance and adhesion with the fillers filled in the drilling holes 10.

For example, at least one bulb 130 may be formed along the outer circumferential surface of the PC strand 110 at predetermined intervals. The bulb 130 may be formed on the outer circumferential surface of the PC strand wire 110 by welding or the like, and may be formed using the PC strand wire 110 itself that is twisted in various strands. As an example, it is possible to form bulbs (projections) of rhombus by releasing the twist of several strands of PC strand 110, as well as to increase the pull resistance and frictional force through various shapes such as the shape of a right triangle.

PC strands, such as wedges, on both sides of a specific position of the PC strands 110 to form the bulbs (projections) 130 in one way to form the bulb (projections) 130 at a specific position of the PC strands (110). Compression of the 110 is fixed and the fixed wedges are pushed to each other to cause loosening at a specific position of the twisted PC strand, thereby forming a bulb (protrusion).

As another example for increasing pullout resistance and adhesion, the ground reinforcement device 100 using a PC strand may include a pin ring 140 and a pull-out safety spring 150 to prevent drawing. The anti-pull safety spring 150 as shown in FIG. 6 may be provided in plurality around the PC strand 110. The anti-pull safety spring 150 is preferably installed to be caught by the bulb (protrusion) 130.

In addition, the pin ring 140 as shown in B of FIG. 6 may also be installed in the PC strand 110 in a number of ways.

Figure 4 is a view showing another embodiment of the pressure plate of the ground reinforcement device using a PC strand according to the present invention.

As shown in FIG. 4, the acupressure plate 160 forms a hole through which the PC strand line 110 can penetrate, as well as a rubber plate 161 that can block a space between the PC strand line 110 and the hole. Can be formed.

The rubber plate 161 may be formed in a form corresponding to the shape of the perforation hole to seal the perforation as well as to form a hole through which the PC strand 110 may pass. For example, when the drilling hole is drilled in the form of a cylinder, the rubber plate 161 may have a hole in which the PC strand 110 passes through the center, and may have a donut shape that may seal the cylindrical drilling hole. .

In addition, the acupressure plate 160 and the rubber plate 161 may be provided with a grouting hole 162 for inserting a pipe for grouting.

5 is a view showing the configuration and installed state of the ground reinforcement device using a PC strand in accordance with a second embodiment of the present invention.

As shown, the ground reinforcement device 100 using the PC strand in accordance with the second embodiment of the present invention is installed in the drilling hole 10 formed by excavating the ground and rock, the drilling hole 10 is cement milk or Fillers such as mortar are filled.

The ground reinforcement device 100 using the PC strand is a PC strand (110), the fixture 120 formed on one end of the PC strand (110), the pressure plate 160 and the pressure plate fastened to the other end of the PC strand (110) ( 160 includes a fastening device 170 for fastening the PC strand (110), and additionally, the bulb (protrusion) 130 to prevent the pull out by increasing the pull resistance and friction force, the anti-pull safety spring 140 and the pin ring 150 may be further provided.

The PC strand 110 may be formed by using one strand or combining a plurality of strands. In addition, the length of the PC strand 110 may vary depending on the depth of perforation formed by the excavation work. For example, the PC strand may be composed of seven strands of twisted strands by twisting six strands around one strand.

The fixture 120 has a larger diameter than the PC strand 110 at one end of the PC strand 110. The fixing body 120 can prevent the pulling out by allowing the ground reinforcing device 100 using the PC strand to be seated and fixed even when the ground reinforcing device 100 using the PC strand is inserted into the boring and tensioned. have.

Fixture 120 may be coupled by hydraulic pressure at the end of the PC strand (110). The insert 121 may be used to couple the fixing body 120 and the PC strand 110 to each other. If the insert 121 is a thin heat-treated screw thread, when the fixing body 120 and the PC strand wire 110 are coupled to each other, the insert 121 is mounted on the coupling portion of the fixing body 120 and the PC strand wire 110 to fix the fixing body 120 by hydraulic pressure. When a force is applied, the insert 121 of the screw thread is broken and is strongly adhered to both the fixing body 120 and the PC strand 110, thereby increasing the bonding force between the fixing body 120 and the PC strand 110. .

  In addition, the fixing unit 120 serves to fix one end of the PC strand (110) consisting of several strands and can prevent the PC strand (110) from being released.

The pressure plate 160 forms a hole through which the PC strand line 110 can penetrate, such that the other end of the PC strand line 110 penetrates. The pressure plate 160 serves to fix the ground around the inlet of the drilling hole when the PC strand 110 is inserted into the drilling. In addition, if necessary, a pipe through hole (not shown) through which the pipe for injecting filler such as cement milk and mortar may be formed in the pressure plate 160.

The fastening device 170 couples the pressure plate 160 and the PC strand 110 in such a manner that the pressure plate 160 is coupled with the PC strand 110 in the state where the PC strand 110 is tensioned.

The fastening device includes a wedge nut 170 for supporting the pressure plate 160 that firmly supports the ground around the hole, and a wedge for fixing the wedge nut 170 to the PC strand 110. do. In describing the fasteners, the same reference numerals are used to describe the entire fastener and to describe the wedge nut as one component.

After tensioning the PC strand 110 of the other end penetrating the acupressure plate 160, the wedge nut 170 and the wedge 180 using a tensioning device, and fixed the acupressure plate 160 to the ground and using the wedge nut 170 Supports the pressure plate 160. Then, the wedge 180 is inserted into and fixed into the empty space of the wedge nut 180 and the PC strand 110.

When the tension of the tension device is released after the wedge 180 is inserted and fixed, the force of pulling the PC strand 110 is generated by the elasticity of the PC strand 110 so that the wedge 180 is connected to the PC strand 110 and the wedge nut. In addition, the wedge 180 may be further compressed into the empty space of the 170 and further compress the PC strand 110. To this end, an inner circumferential surface of the wedge 180 may form an unevenness or a thread.

A detailed description of another embodiment of the fastening device is described with reference to FIGS. 7A to 7C.

 In addition, the ground reinforcement device 100 using the PC strand can be provided with a variety of additional devices as described in Figure 1 to prevent the pull out by increasing the pull resistance and frictional force with the filler filled in the drilling hole. Specifically, the pull resistance and the frictional force of the ground reinforcement device 100 using the PC strand using the bulb (protrusion) 130, the pin ring 140 and the anti-pull safety spring 150 can be increased.

7A to 7C are views illustrating various embodiments of the fastening device among the ground reinforcement devices using the PC strand according to the present invention.

As an embodiment of the fastening device Figure 7a is a fastening method that can be in close contact at various angles according to the ground conditions by the wedge nut 170 and the wedge 180.

Here, even when the wedge nut 170 and the pressure plate 160 is in contact with the surface of the PC strand and the ground is inserted into the ground at any angle, the wedge nut 170 is completely in close contact with the pressure plate 160. To help.

In order for the wedge nut 170 and the pressure plate 160 to be in close contact with each other at a predetermined angle, the wedge nut 170 is cut so as to be inclined to one side, and the pressure plate 160 is not only penetrated by the PC strand 110 but also the wedge. The cutting inclined portion of the nut 170 is inserted to allow the wedge nut 170 to be in close contact at any angle. In this case, even if the PC strand 110 does not penetrate the pressure plate 160 to be close to the right angle, the PC strands 110 may be completely bent without changing the angle of the wedge nut 170 and the pressure plate 160 without being bent. You can do that.

The wedge 180 is inserted into the empty space of the wedge nut 170 and the PC strand 110, so that the wedge nut 170 and the PC strand 110 is fixed in a state of being completely in close contact.

As another embodiment of the fastening device Figure 7b is fastening the PC strand (110) and the pressure plate 160 using a fastening bolt 712 and a fastening nut 713.

The fastening bolt 712 forms a groove into which one end of the PC strand 110 can be inserted. The fastening bolt 712 and the PC strand wire 110 is to press the fastening bolt 712 by using hydraulic pressure so that the fastening bolt 712 and the PC strand wire 110 is securely coupled.

At this time, the fastening bolt 712 is inserted into the groove of the fastening bolt 712 is inserted into the groove of the fastening bolt 712 is inserted into the screw thread line 712 and the PC strand wire 110 is coupled. In this case, the insert 711 is strongly bonded to both the fastening bolt 712 and the PC lecture line 110 at the same time the insert 711 formed of a screw thread is damaged when the fastening bolt 712 and the PC strand wire 110 is coupled to the fastening bolt. 712 and the PC strand 110 serves as a connector that connects more firmly.

In addition, a screw thread is formed on the outer circumferential surface of the fastening bolt 712 to allow the fastening nut 713 to be coupled through screwing. By continuing to tighten the fastening nut 713 through this the pressure plate 160 can be fixed in close contact with the ground.

As another embodiment of the fastening device Figure 7c is connected to the all-screw-type rebar 723 using a connection coupler 721 at the end of the PC strand can be fixed to the pressure plate 160 using a fastening method of the existing rebar.

The connection coupler 721 forms a hole into which one end of the PC strand 110 and the all screw type rebar 723 may be inserted and fixed. The hole into which the PC strand wire 110 is inserted forms a space in which the PC strand wire 110 and the connection coupler 721 may be coupled using the wedge 722. Thus, PC strand 110 is coupled to coupling coupler 721 using wedge 722.

In addition, the all screw type rebar 723 is fixed through the coupling coupler 721 and the screw coupling.

When the PC strand wire 110 and the all-screw type reinforcing bar 723 are coupled to each other by the coupling coupler 721, the all screw type reinforcing bars 723 pass through the pressure plate 160, and the acupressure plate using the fastening nut 724. Let 160 be fixed.

8 is a flowchart showing the procedure of the ground reinforcement method using a PC strand according to the present invention.

First, a perforation hole is formed from a surface of a tunnel excavation hole, a slope, or a building trench to a rock layer to a predetermined depth.

When the boring hole is formed, the PC strand structure is inserted into the boring hole. (B) The PC strand structure is inserted into the guide rod. At this time, the PC strand wire structure inserted into the guide rod is inserted in a state in which the expansion diameter fixing member is not unfolded by the elastic ring.

After the PC strand structure is inserted into the hole, the guide rod is drawn to fix the PC strand structure in the hole. (C) The PC strand structure has the elastic rod removed while the guide rod is pulled out so that the diameter part of the diameter fixing unit is open. While the expansion wing is fixed to the inner wall of the drilling hole is fixed. If necessary, the drawn guide rod may be reinserted to further open the expanded wing of the open diameter fixed fixture.

After the PC strand structure is settled, draw the PC strand using a tensioning device and fix it using acupressure plate and fastening device. (D) At this time, impactor method using electric and air compressor fixtures as a fastening method, hammers and other blows can be made. A tool-based method or the like can be used.

Finally, grouting is carried out through the grouting hole. (E) Resin (resin), cement fixing agent, cement milk and mortar are used as fillers for grouting.

In some cases, there may be soft ground or cracks or cracks in the ground. In this case, when the gap or the crack is small and narrow, the gap or the crack may be sufficiently narrowed by the tension of the PC strand structure itself.

However, when the cracks or cracks are large, it is preferable to inject the injection material like cement mortar. In this case, the cement mortar may be injected at the same time or at a time difference, and a pure or finished hardener may be injected, and if necessary, the injection material may be injected under pressure to improve the physical properties of the ground, thereby increasing safety.

However, in some cases, after pressing grouting work, a tensioning force may be applied to the ground reinforcement device using a PC strand, and then fixed by a fastening device.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

1 is a view showing an example in which the ground reinforcement method is generally applied.

2 is a view showing the configuration and installed state of the ground reinforcement device using a PC strand in accordance with a first embodiment of the present invention.

FIG. 3 is a view showing a state in which a ground reinforcement apparatus using a PC strand is fixed by drawing a guide rod in the first embodiment.

Figure 4 is a view showing another embodiment of the pressure plate of the ground reinforcement device using a PC strand according to the present invention.

5 is a view showing the configuration and installed state of the ground reinforcement device using a PC strand in accordance with a second embodiment of the present invention.

6 is a view showing the configuration of the spring is installed in the ground reinforcement device using a PC strand to increase the friction force.

7A to 7C are views illustrating various embodiments of the fastening device among the ground reinforcement devices using the PC strand according to the present invention.

8 is a flowchart illustrating a procedure of the ground reinforcement method using a PC strand according to the present invention.

Claims (21)

PC strands forming at least one bulb; A diameter fixing member having at least one diameter expanding blade fixed to one end of the PC strand, and opened by an elastic spring; Acupressure plate is installed so that the other end of the PC strand is penetrated to fix the ground around the inlet of the drill hole; And Ground reinforcement device using a PC stranded wire comprising a fastening device for fastening and fastening the pressure plate and the PC stranded wire in the state that the PC strand is tensioned. The method of claim 1, wherein the diameter fixing unit A fixing unit having a larger diameter than the PC strand and fixed to one end of the PC strand; The ground reinforcement device using a PC strand, characterized in that the hinge coupled to the fixing portion, including a diameter expansion unit having at least one or more diameter expansion wings that are opened by the elastic spring. The method of claim 2, wherein the enlarged diameter portion Ground reinforcement device using a PC strand, characterized in that further comprising an elastic ring on the outer circumferential surface of the at least one enlarged wing. The method of claim 3, wherein The ground reinforcement device using a PC strand is formed in a cylindrical shape further comprising a guide rod having a locking jaw at the end. The method of claim 3 or 4, wherein the fastening device A wedge nut supporting the pressure plate; And Ground reinforcement device using a PC strand, characterized in that it comprises a wedge is inserted into the space between the wedge nut and the PC strand to secure the wedge nut and the PC strand. The method of claim 5, The wedge nut is cut so that one side forms an inclined surface, and a hole is formed in the pressure plate so that the cut portion of the wedge nut passes through the pressure plate, such that the wedge nut is in close contact with the pressure plate at a predetermined angle. Ground reinforcement device using PC strand. The fastening device according to any one of claims 1 to 4, wherein the fastening device is A fastening bolt which forms a groove to which one end of the PC strand penetrates the pressure plate is inserted to be coupled and forms a screw thread on an outer circumferential surface thereof; And Ground reinforcement device using a PC stranded wire, characterized in that it comprises a fastening nut for supporting the pressure plate by screwing with a screw thread formed on the outer peripheral surface of the fastening bolt. The method of claim 7, wherein the fastening bolt is Ground reinforcement device using a PC strand, characterized in that it further comprises an insert into the groove is inserted into one end of the PC strand. The method of claim 1, wherein the fastening device is A coupler penetrating the acupressure plate and forming a thread on an outer circumferential surface thereof, and a coupling coupler to which the PC strand is inserted and coupled; And Ground reinforcement device using a PC stranded wire comprising a fastening nut for supporting the acupressure plate by screwing with a screw thread formed on the outer peripheral surface of the reinforcing bar. The method of claim 9, wherein the coupling coupler Ground reinforcement device using a PC strand, characterized in that the screw coupled to the reinforcing bar, and coupled by the PC strand and the wedge. PC strands forming at least one bulb; A diameter fixing member having at least one diameter expanding blade fixed to one end of the PC strand, and opened by an elastic spring; Acupressure plate is installed so that the other end of the PC strand is penetrated to fix the ground around the inlet of the drill hole; And It is formed on one side of the pressure plate to pass through the PC strand, the rubber plate is inserted into the drilling hole to fix the pressure plate and seal the drilling hole, The ground reinforcement device using a PC stranded wire, characterized in that it comprises a grouting hole in the pressure plate and the rubber plate. delete delete PC strands; One end of the PC strand is inserted and fixed, and a fixture including an insert in a portion where the PC strand is inserted; An acupressure plate forming a hole through which the other end of the PC strand is penetrated, and fixing the ground around the perforation hole inlet; A fastening bolt which forms a groove to which one end of the PC strand penetrates the pressure plate is inserted to be coupled and forms a screw thread on an outer circumferential surface thereof; And Ground reinforcement device using a PC stranded wire, characterized in that it comprises a fastening nut for supporting the pressure plate by screwing with a screw thread formed on the outer peripheral surface of the fastening bolt. The method of claim 14, wherein the fastening bolt Ground reinforcement device using a PC strand, characterized in that it further comprises an insert into the groove is inserted into one end of the PC strand. delete delete 16. The PC strand of claim 11, wherein the PC strand is Forming at least one bulb, ground reinforced device using a PC strand, characterized in that it comprises a pull-resistant safety spring in a predetermined position. Drilling a ground to form a drilling hole; Inserting a PC strand having a diameter-fixed fixture into a cylindrical guide rod into the drilling hole; 3 steps of drawing out the guide rod; Tensioning the PC strand and then fastening the PC strand and the pressure plate using a fastening device; And Ground reinforcement method using a PC strand comprising a step of performing grouting through the grouting hole formed in the pressure plate. The method of claim 19, And re-inserting the drawn guide rod to apply pressure to the diameter-fixed fixture. 20. The method of claim 19, wherein the diameter fixing unit A fixing unit having a larger diameter than the PC strand and fixed to one end of the PC strand; And a diameter expanding portion hinge-coupled with the fixing portion and having at least one diameter expanding blade that is opened by an elastic spring.

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