KR20060105393A - Device for prestressing and soil nailing method using the same - Google Patents

Abstract

The present invention provides a nail tension device that enables the tension of the nail inserted into the drilling hole to increase the reinforcement effect and the reinforcement range of the nail inserted into one drilling hole in the soil nailing method and the ground reinforcement effect using the same It relates to the increased soil nailing method.

The present invention is a device for tensioning the nail in combination with the leading end of the nail is inserted into the boring hole of the ground to introduce the prestress, made larger than the boring hole, the pressure plate formed in the through hole; A bar member disposed to penetrate the through hole of the pressure plate and having a fixing device to be fixed to the pressure plate; A closed member having a size that is inserted into the drilling hole and the inside is empty, and an insertion hole is formed at the front end thereof so that a part including the rear end of the rod is inserted through the insertion hole and received therein, and the rear end is inserted into the drilling hole. Body to which the leading end of the nail is coupled; And an elastic member that is accommodated inside the main body, the front end portion is coupled to the front end of the main body, and the rear end is coupled to the rear end of the rod to stretch and move the main body according to the movement of the bar. To provide.

In addition, the present invention (a) perforating the ground to form a punching hole; (b) inserting a nail tension device into the drilling hole in a state in which a nail is coupled to the rear end of the main body; (c) injecting a filler into the drilling hole to fix the nail inserted into the drilling hole to the ground; And (d) tensioning the nail of the nail tension device to tension the nail; (e) fixing the bar to the pressure plate while compressing the pressure plate of the nail tension device to the ground around the perforation hole while the nail is in tension; And, (f) removing the tensile force applied to the bar of the nail tension device; provides a nailing method using a nail tension device comprising a.

Soil Nailing, Nail, Tension Device, Prestress

Description

Nail tensioning device and soil nailing method using the same {Device for prestressing and soil nailing method using the same}

1 is a state cross-sectional view of the ground reinforcement according to the conventional soil nailing method.

Figure 2 is an exploded perspective view showing an embodiment of a nail tension device according to the invention.

3 is a cross-sectional view of the nail tension device of FIG.

4 is a cross-sectional view of the ground reinforcement according to the soil nailing method using the nail tension device of FIG.

Figure 5 is an exploded perspective view showing another embodiment of the nail tension device according to the invention

Figure 6 is an exploded perspective view showing a method of coupling the nail tension device and the nail in the nail tension device of FIG.

Figure 7 is a cross-sectional view of the nail tension device of Figure 5 combined.

8 is a cross-sectional view of the ground reinforcement according to the soil nailing method using the nail tension device of FIG.

<Explanation of symbols on main parts of the drawings>

10: pressure plate 11: through

20: bar 25: nut

30: main body 31: insertion hole

32: nail connector 35: fastener

36: hollow bolt 37: hollow wedge

40: elastic member (spring)

50: spring mounting plate 51: female thread hole

N: Nail S: Spacing Material

G: Ground H: Hole

F: filler

The present invention relates to a nail tensioning device and a soil nailing method using the same, and more particularly, to be inserted into the boring hole so as to increase the reinforcing effect and reinforcement range of the nail inserted into one boring hole in the soil nailing method. The present invention relates to a nail tensioning device that enables nail tension and a soil nailing method that increases the reinforcing effect of the ground using the nail tension device.

Ground reinforcement works are involved in reinforcing adjacent slopes in railway and highway construction, or in the construction of civil engineering-related facilities involving excavation, such as underground structures and tunnels, to prevent the collapse of ground around excavation.

Soil nailing method is a ground reinforcement method that inserts reinforcement into the ground to increase the overall shear strength of the ground itself and possibly restrains the displacement of the ground expected during or after construction. As such, the small nailing method can make slope slope as steep incline to improve land use efficiency, and since the ground is used as a wall, it can build high retaining wall, and it is quick, simple, economical, and use of light equipment. It is widely used as a flexible ground reinforcement method for slope reinforcement and excavation surface because of its advantages over other methods.

1 is a cross-sectional view of a state in which ground reinforcement is completed according to a conventional soil nailing method. In the related art, a soil nailing method is used by grouting a hole in a drilling hole after inserting a reinforcing material (nail) into a drilling hole formed by drilling the ground. Has been performed. At this time, the nail installation interval is set on the basis of the range of the strength of the nail, the conventional soil nailing method as shown in Figure 1 is completed by inserting only one nail in the drilling hole as well as not apply a separate tensile force to the nail. For sufficient ground reinforcement effect, nails must be installed at relatively tight intervals. This problem leads to an increase in the amount of nail installation, which acts as a cause of lowering the economics of the soil nailing method.

On the other hand, the nail must be placed in a fixed position in the center of the drilling hole is stable construction according to the structural design. To this end, in the conventional small nailing method, the front plate (ie, acupressure plate) that is pressed into the drilling hole while being combined with the tip of the nail is prepared. However, in the conventional small nailing method as shown in FIG. 1, since the pressure plate is fixedly installed by simply tightening the nut, it is not able to exert sufficient pressure, and when the external force acts easily during the excavation or grouting process of the peripheral part, Had a problem that the pressure plate was released.

The present invention has been made to solve the above-described problems, so that the nail tension is also inserted into the drill hole even in the small nailing method to increase the reinforcement effect and the reinforcement range of the nail inserted into the drill hole An object of the present invention is to provide a nail tension device and a soil nailing method using the same.

Another object of the present invention is to provide a nail tensioning device and a soy nailing method using the same, by increasing the pressure of the pressure plate to improve the resistance to external force, thereby stably fixing the nail and thus maximizing the nail strength.

Still another object of the present invention is to provide a nail tensioning device and a soil nailing method using the same, so that the ground reinforcement effect can be easily confirmed after completion of the ground reinforcement work so that additional reinforcement work can be timely performed when necessary. It is.

In order to achieve the above object, the present invention is a device for tensioning the nail in combination with the tip of the nail is inserted into the boring hole of the ground to introduce prestress,

Acupressure plate is made larger than the drilling hole, the through-hole formed therein; A bar member disposed to penetrate the through hole of the pressure plate and having a fixing device to be fixed to the pressure plate; A closed member having a size that is inserted into the drilling hole and the inside is empty, and an insertion hole is formed at the front end thereof so that a part including the rear end of the rod is inserted through the insertion hole and received therein, and the rear end is inserted into the drilling hole. Body to which the leading end of the nail is coupled; And an elastic member that is accommodated inside the main body, the front end portion is coupled to the front end of the main body, and the rear end is coupled to the rear end of the rod to stretch and move the main body according to the movement of the bar. To provide.

In addition, the present invention (a) perforating the ground to form a punching hole; (b) inserting a nail tension device into the drilling hole in a state in which a nail is coupled to the rear end of the main body; (c) injecting a filler into the drilling hole to fix the nail inserted into the drilling hole to the ground; And (d) tensioning the nail of the nail tension device to tension the nail; (e) fixing the bar to the pressure plate while compressing the pressure plate of the nail tension device to the ground around the perforation hole while the nail is in tension; And, (f) removing the tensile force applied to the bar of the nail tension device; provides a nailing method using a nail tension device comprising a.

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

Figures 2 to 4 are views of one embodiment of the nail tension device according to the invention and Figures 5 to 8 are views of another embodiment of the nail tension device according to the invention, these are coupled to the nail tension device According to the number of nails (N) and how to combine them. That is, Figures 2 to 4 is an embodiment in which one nail is coupled to the nail tensioning device by a bolt coupling method, Figures 5 to 8 are a plurality of (specifically four) nails wedge coupling method to the nail tension device It is an embodiment coupled by. As the number of nails coupled to the nail tension device increases, the structural performance of the small nail completed in one drilling hole is expected to be improved. Accordingly, in the present invention, four nails are applied to the nail tension device as shown in FIGS. 5 to 8. It is proposed to be inserted into one drilling hole in a coupled state. Of course, the nail tension device may be coupled to the number of nails more than four or less, to select the appropriate number according to the structural performance requirements.

Nail tension device according to the present invention is a device for tensioning the nail in combination with the leading end of the nail is inserted into the boring hole of the ground to introduce the prestressing plate 10, bar 20, the main body 30, elastic member It is configured to include (40) essentially, and to tension the nail (N) by the compressive force of the elastic member 40 and at the same time to increase the pressure of the pressure plate 10 by the restoring force of the elastic member (40). It has its technical features.

The pressure plate 10 is made larger than the drilling hole (H), the through-hole 11 is formed in the plane. The pressure plate 10 is fixedly installed while supporting the ground around the drilling hole H, thereby stably fixing the installation position of the nail N inserted into the drilling hole H, and structurally fixing the ground surface at a high acupressure. It serves to reinforce. In addition, the acupressure plate 10 of the present invention serves to protect the main body 30, etc., constituting the nail tension device, in addition to the acupressure plate that is applied to the conventional small nailing method. That is, in the conventional small nailing method, the grouting is performed while closing the entire drilling hole H to the tip of the drilling hole H, whereas in the present invention, grouting is performed only to the rear end of the main body 30, so that the main body 30 is ground. The bar is not completely buried in, the pressure plate 10 is to serve to protect the body 30 while closing the perforation hole. The pressure plate 10 uses steel as in the conventional small nailing method.

The bar 20 is disposed to pass through the through hole 11 of the pressure plate, and has a fixing device to be fixed to the pressure plate. In the embodiment of the present invention, the rod 20 has a male screw formed on the outer circumferential surface thereof, and the nut 25 is adopted as a fixing device provided in the rod. In other words, the nut 25 is fastened to the bar 20, and the bar 20 is fixed to the pressure plate 10 in such a manner that the nut is brought into close contact with the pressure plate 10. In the present invention, since the pressure plate 10 is installed in contact with the drilling hole (H), it is possible to fix the bar plate 20 as well as the pressure plate 10 only by tightening the nut 25.

The main body 30 is a closed member having a size that is inserted into the drilling hole (H) and the inside is empty, the insertion portion 31 is formed at the front end portion of the insert portion 31 including the rear end of the bar 20 It is inserted through and received inside, the rear end portion is coupled to the front end of the nail (N) inserted into the drilling hole (H). At this time, if a plurality of nails are coupled to the rear end of the main body as shown in Figures 5 to 8, it will be able to double the reinforcement effect of the nail of the small nail structure completed in one drilling hole.

The method of joining the main body 30 and the nail N may be any method such as welding, bolting, or wedge joining, and the welding joint is the most stable considering the tension between the nail and the nail. Considering the convenience of manufacturing, prefabricated bolt coupling and wedge coupling may be advantageous. However, in the embodiment of the present invention specifically proposes a bolt coupling method and a wedge coupling method.

The bolt coupling method adopts that the main connector 30 is formed with a female connector, the inner circumferential surface of which is further threaded at the rear end thereof, and the male end of the nail N inserted into the drilling hole H to be male threaded. This can be completed by fastening to the nail connector (32). In the embodiment of Figure 2, the nail connector 32 is configured to protrude from the rear end of the main body, which is to induce a stable coupling to ensure a sufficient coupling length with the nail (N).

The wedge joining method adopts a main body 30 having a fastening hole 35 further formed at the rear end thereof, and inserts a tip end portion of the nail N inserted into the drilling hole H into the fastening hole 35. It can complete by pushing 37. In the embodiment of FIG. 5, the bolt 36 is further provided, and the bolt 36 serves to induce a stable coupling by ensuring a sufficient coupling length with the nail N as its length. At this time, the fastening hole 35 formed at the end after the main body 30 has a female screw formed on the inner circumferential surface thereof, while the outer circumferential surface is formed with the male screw while the hollow bolt 36 and the outer circumferential surface formed with the conical shape are formed in a conical shape. A wedge 37 having a cutout 37b starting from one end of the outer circumference and the other end is formed. Of course, the wedge 37 may be formed in a structure in which the cutout 37b is formed to the other end so that the wedge can be separated into several pieces. In the wedge coupling method having such a configuration, the bolt 36 is fastened to the fastening hole 35 and the tip of the nail N is simultaneously inserted into the hollows 36a and 37a of the bolt and the wedge, and then the wedge 37 is pushed in. Is done by. As the wedge 37 enters the hollow 36a of the bolt, the wedge 37 is gradually retracted inward by the incision 37b, and is brought into close contact with the nail N fitted in the hollow 37a of the wedge, and as a result, Nail (N) is to be able to tightly bind to the rear end of the main body 30.

The elastic member 40 is accommodated in the main body 30, the front end is coupled to the front end of the main body 30 and the rear end is coupled to the rear end of the bar 20 to expand and contract according to the movement of the bar 20 While acting to move the body 30.

When a tensile force is applied at the tip of the bar 20 (that is, a pull on the bar tip), the elastic member 40 is compressed, and the compressive force of the elastic member 40 is transmitted to the tip of the main body 30 to transfer the main body 30. Push and move, and finally the nail (N) coupled to the rear end of the main body 30 is tensioned (pulled) by the movement of the main body 30. As a result, tension of the nail N becomes possible.

On the other hand, when the elastic member 40 is compressed to produce a restoring force to return to the original state accordingly, this restoring force increases the acupressure of the pressure plate (10).

In the embodiment of the present invention, the spring is adopted as the elastic member 40, but any other member having the same function may be selected. However, in FIG. 2, a spring fixing plate 50 having a rear end portion of the spring 40 fixed thereto is further provided to uniformly transmit the compressive force of the spring 40 to the main body 30. At this time, by forming a female thread hole (51) in the spring fixing plate 50 to the rear end of the bar 20, the tension force of the bar 20 without the direct coupling of the bar 20 and the spring 40 to the spring ( Can be converted to a compression force of 40). Instead of the female screw hole 51, any configuration that replaces its function can be formed.

Referring to FIGS. 4 and 8, the nailing method using the aforementioned nail tension device is as follows.

(a) Ground drilling stage

Drilling the ground (G) to form a hole (H). When the nail tension device of the present invention is used, it is possible to complete the pre-stressed soil nailing structure, and thus, unlike the conventional soil nailing method, the present invention will not have to form the hole H very closely.

(b) Nail insertion step

The nail tension device described above is inserted into the drilling hole (H) in a state in which the nail (N) is coupled to the rear end of the main body (30). At this time, since the pressure plate 10 of the nail tension device is caught in the drilling hole (H) is inserted into the drilling hole (H) from the body 30 to the nail (N). The rear end of the main body 30 of the nail tension device combines a plurality of nails (N) to improve the structural performance by inserting a plurality of nails (N) in one drilling hole (H). The nail (N) is preferably such that the gap retaining material (S) for maintaining the gap between the hole (H) or the gap between the nail (N) is more coupled, which is the nail (N) is a hole (H) This is to ensure that the arrangement is secured according to the design without biasing to either side within the cavity.

(c) grouting step

Filler (F) is injected into the drilling hole (H) to fix the nail (N) inserted in the drilling hole (H) to the ground (G). The filler F is injected only to the drilling hole H below the main body 30 to restrain the nail N.

(d) Nail tension stage

By tensioning the bar 20 of the nail tension device to tension the nail (N). As described above, the tensile force applied to the bar 20 is converted into the compressive force of the elastic member 40, thereby moving the main body 30 in the same direction as the tensile force and eventually tensioning the nail N.

(e) acupressure plate fixing step

The bar 20 is fixed to the pressure plate 10 while pressing the pressure plate 10 of the nail tension device to the ground G around the perforation hole H while the nail N is tense. As in the embodiment of the present invention, the rod 20 may be easily fixed by tightening the nut 25 by adopting a male screw formed on the outer circumferential surface thereof.

(f) Tension removal stage

Remove the tension applied to the bar 20 of the nail tension device. Even if the tensile force is removed, the compressive force of the elastic member 40 is maintained by fixing the bar 20 so that the tension state of the nail N is also maintained. However, since the restoring force will act to some extent from the removal of the tensile force, the restoring force acts to pull the bar 20 in the opposite direction to the tensile direction, and thus the pressure plate 10 becomes a stronger acupressure. The drilling hole H is compressed.

After the ground reinforcement work is completed through a series of processes as described above, it is possible to check whether the ground reinforcement effect is continued or not as the state of tension of the nail N, and at this time, whether the tension state of the nail H is continued It can be easily confirmed by the breakage of the elastic member 40 accommodated in the body of the nail tension device. Additional reinforcement work necessary for this will be able to proceed in time.

According to the present invention as described above can be expected the following effects.

First, in the nailing method, the tension of the nail inserted into the drilling hole becomes possible, so that the reinforcing effect and the reinforcement range of the nail inserted into the drilling hole can be increased. It is advantageous to secure economic feasibility.

Second, by increasing the bearing pressure of the pressure plate to improve the resistance to external forces, it is possible to secure nail stability and strengthen the ground surface, as well as to maximize the nail strength.

Third, after the ground reinforcement work is completed, it is easy to confirm whether the ground reinforcement effect is continued, and thus, there is an effect of timely additional reinforcement work required.

Claims (11)

As a device for tensioning the nail in combination with the tip of the nail that is inserted into the drilling hole of the ground to introduce prestress, Acupressure plate is made larger than the drilling hole, the through-hole formed in the plane; A bar member disposed to penetrate the through hole of the pressure plate and having a fixing device to be fixed to the pressure plate; A closed member having a size that is inserted into the drilling hole and the inside is empty, and an insertion hole is formed at the front end thereof so that a part including the rear end of the rod is inserted through the insertion hole and received therein, and the rear end is inserted into the drilling hole. Body to which the leading end of the nail is coupled; And, It is accommodated in the main body, the front end portion is coupled to the front end portion and the rear end is coupled to the rear end of the bar elastic member to move the main body while being stretched in accordance with the movement of the rod; Nail tension device, characterized in that configured to include. In claim 1, Nail tension device, characterized in that the elastic member is a spring. In claim 2, The spring fixing plate is further coupled to the rear end of the rod, the nail tension device, characterized in that the spring fixed end fixed to the spring fixing plate. In claim 3, A male screw is formed on the outer circumferential surface of the bar and the fixing device provided on the bar is a nut. The spring fixing plate is formed with a female screw hole is nail tension device, characterized in that for screwing with the rear end of the bar. The method according to any one of claims 1 to 4, The rear end portion of the main body is further formed with a female connector nail processing inner circumferential surface, Nail tension device, characterized in that the front end portion of the nail inserted into the drilling hole is coupled to the nail connector is processed with a male thread. The method according to any one of claims 1 to 4, A fastening hole is further formed at the rear end of the main body, Nail tension device, characterized in that fixed to the fastening hole using the wedge of the nail is inserted into the drilling hole. In claim 6, The fastening hole is formed with an internal thread on the inner circumferential surface, The outer circumferential surface is formed of a male screw so as to fasten with the female screw of the fastening hole further includes a hollow bolt formed in the inner circumferential surface of the cone, The wedge is a hollow member having an outer circumferential surface formed in a conical shape, starting from one end with a small outer circumference, and having a cutout directed toward the other end. Nail tension device, characterized in that fixed to the front end portion of the nail to be inserted into the drilling hole and the bolt and the wedge by pressing the wedge at the same time. The method according to any one of claims 1 to 4, Nail tension device, characterized in that coupled to the plurality of nails inserted into one drilling hole to the rear end of the main body. (a) perforating the ground to form perforations; (b) inserting and installing the nail tensioning device of claim 1 into the punching hole in a state in which the nail is coupled to the rear end of the main body; (c) injecting a filler into the drilling hole to fix the nail inserted into the drilling hole to the ground; And, (d) tensioning the nail of the nail tensioner to tension the nail; (e) fixing the bar to the pressure plate while compressing the pressure plate of the nail tension device to the ground around the perforation hole while the nail is in tension; And, (f) removing the tension applied to the bar of the nail tensioner; Soil nailing method using a nail tension device, characterized in that consisting of. In claim 9, Soil nailing method using a nail tension device, characterized in that a plurality of nails are coupled to the main body rear end of the nail tension device is inserted into a plurality of nail holes. The method of claim 9 or 10, The nail nailing method using a nail tension device, characterized in that the nail is further coupled to the gap retaining material for maintaining the gap between the hole or the gap between the holes.

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