KR101510297B1 - A removable prestressing steel pipe soil nailing structure - Google Patents

Abstract

The present invention relates to a removable prestressing steel pipe sole nailing structure, in which a perforation hole is formed at a proper position of a side wall to insert a spiral steel pipe, and a space between the perforation hole and the spiral steel pipe is filled with cement milk to grout A PC stranded wire having a plurality of steel strands and one end connected to the removable inner lower body, and a PC stranded wire connected to the inner circumference of the PC stranded wire, A spirally wound steel pipe which is inserted into the threaded portion of the inner bottom body of the removing body by forming a female threaded portion on an inner side of one end of the spiral steel pipe pipe and a sheath pipe surrounding the entire outer surface of the spiral steel pipe, Spiral Steel Pipe Forms an insertion port so that the pipe extends outward A pipe attached to the plate and having an inclined end portion formed at one end thereof and a PC stranded wire penetrating the center of the other end; a cutting pipe positioned at an upper end of each of the pipes; And a wedge cone portion for fixing the PC stranded wire extending outwardly from the pipe end to the outside. The present invention relates to a pre-stressed steel pipe sole nailing structure.

Description

[0001] The present invention relates to a removable prestressing steel pipe nailing structure,

The present invention relates to a removable prestressing steel pipe sole nailing structure, in which a perforation hole is formed at a proper position of a side wall to insert a spiral steel pipe, and a space between the perforation hole and the spiral steel pipe is filled with cement milk to grout A PC stranded wire having a plurality of steel strands and one end connected to the removable inner lower body, and a PC stranded wire connected to the inner circumference of the PC stranded wire, A spiral steel pipe connected to the threaded portion of the removable inner bottom body by forming a female thread on an inner side of the one end, a sheath pipe surrounding the entire outer surface of the spiral steel pipe, and a stiffener attached on the shotcrete, Spiral Steel Pipe Pipe and sheath pipe are extended to the outside. A pipe having an inlet formed thereon, a pipe attached to the plate and having a slant at one end formed in an inclined shape and the PC stranded wire passing through the center of the other end, a cutting pipe located at an upper end of the pipe, And a wedge cone portion for fixing the PC stranded wire extending outward from an end of the cutting pipe to a pre-stressed steel pipe sole nailing structure.

In general, excavation support systems necessary for construction of civil engineering-related structures such as reinforcing natural and artificial slopes adjacent to terraces, earthmoving, railway and roads, underground structures and tunnels, repairing existing retaining walls and installing retaining walls, In order to prevent the surface from collapsing, three reinforcement methods are mainly used: earthwork, earth anchor, and soil nailing.

The soil nailing method is a method in which a reinforcing material such as a deformed steel bar, a steel bar, a steel pipe, or bamboo is inserted into the soil, the inside of the hole is filled with cement milk and the front surface is treated with shotcrete, It is integrated with the ground, which is not reinforced, and externally has the same shape as the conventional gravity type retaining wall.

This soil nailing method basically inserts stiffeners that can resist tensile stress, shear stress and bending moment at relatively small intervals without prestressing to increase the overall shear strength of the ground, suppress the occurrence displacement as much as possible, It is a method to limit the expected relaxation during or after excavation work. It is possible to perform excavation work with low noise and low vibration because it is applied by using relatively light weight equipment, and the drilling depth for the reinforcement area is very high It is very advantageous to reduce the occurrence of disputes caused by the invasion of the boundary of adjacent land and to construct the urban area.

1 is a view showing a conventional soil nailing method. In brief, a construction process is briefly described. A deep hole is drilled downward in a ground of a retaining wall 1, and a reinforcing nail 2, which is a deformed reinforcing bar, A grout material such as a mortar is injected and cured to form a grout solidified body 3 and then the end of the reinforcing nail 2 which is a deformed reinforcing bar exposed to the ground is poured to the side of the pressure plate 4 A soil nailing structure in the form of an inclined pile is formed by fixing to the earth retaining wall 1 by using a fixing nut 5 or the like.

Such a soil nailing structure is constructed by reinforcing the rigidity of the paper sheet against the earth pressure acting on the excavation wall side, that is, toward the earth retaining wall through the peripheral frictional resistance of the grout solidification and the pulling resistance of the reinforcing nail, And to be supportive.

However, the soil nailing structure according to the conventional method is generally constructed such that reinforcing nails buried in the ground penetrate the adjacent land boundaries, so that when the reinforcing nails remain in the ground without removing the reinforcing bars, Air delay, payment of land use charges, and obstacles to construction in adjacent areas, as well as environmental pollution caused by corrosion.

Accordingly, various measures for dismantling and dismantling the reinforcing rails after installation of the reinforcing rails have been proposed. For example, Japanese Patent Application Publication No. 0308379 (registered on Mar. 11, 2003, hereinafter referred to as " Technology 1 ").

The nail device includes a nail having a male screw portion at the lower end side and a female screw portion for screwing the male screw portion of the nail at an inner circumferential surface of the hole drilled at the center, An anchor body portion having a male screw portion as an outer circumferential surface of an engagement protruding portion, an anchor body portion having an inner circumferential surface formed with an inner circumferential surface with an inner circumferential surface bent and penetrating through, and an anchor cover body having a stepped portion for interposing a packing therebetween, A first tube for sealing the upper surface of the anchor cover body and covering the outer surface of the nail, and a second tube for being spaced apart from the first tube.

However, according to the conventional art 1, since the nail itself is made of a reinforcing bar having a groove formed therein, it is not easy to remove it, and a work space and a tool for the nail itself are separately required. Therefore, the removing operation is difficult in a narrow area. It is not flexible to various loads and is very limited in application due to the limit characteristic according to nail material.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a prestressed steel pipe canopy capable of suppressing displacement of excavation surface and enhancing stability, To provide a nailing structure.

In addition, since the construction equipment is simple, the present invention can be easily applied regardless of the construction conditions such as a narrow site where the slope and the housing space are concentrated, and the structure of the nail member is shorter than that of the anchor method and is not fixedly fixed. The present invention is to provide a removable prestressed steel pipe sole nailing structure which can reduce the possibility of mutual dispute because it is easy to remove the nail member.

In order to solve the above-mentioned problems, a prestressing steel pipe soil nailing structure of the present invention comprises a PC strand wire composed of a plurality of strands of steel wire, one end of which is connected to a removable inner lower body, A sheath pipe attached to the shotcrete; and a sheathed steel pipe, a spiral steel pipe pipe, and a sheath pipe attached to the shotcrete, A pipe having an insertion hole formed on the plate so as to extend outwardly; an angled pipe formed at an end of the pipe and having an inclined shape formed at an end thereof and passing through the PC stranded wire at the center of the other end; And the PC stranded wire extending outward from the end of the cutting pipe is fixed Wedge cone is characterized in that comprises section.

According to the removable prestressing steel pipe soil nailing structure of the present invention, by adopting a plurality of steel wires in the form of a bundle capable of being prestressed, it is possible to suppress the displacement of the excavation surface, .

Further, since the construction equipment is simple, the present invention can be easily applied regardless of the construction conditions such as a narrow site with dense slopes or residential spaces, and is not a structure in which a nail member is fixed compared with an anchor construction method, But also the effect of eliminating the possibility of mutual disputes due to the invasion of neighboring districts.

In addition, the use of the spiral steel pipe and the steel strand with high stiffness makes it possible to more firmly support the ground, and when the nail member is removed, the PC steel wire and the spiral steel pipe can be removed. It also helps.

1 is a schematic view showing a schematic structure of a nail anchor according to a conventional nail method.
2 is a view showing the overall configuration of a prestressing steel pipe soil nailing structure according to a preferred embodiment of the present invention.
3 is an enlarged cross-sectional view of the structure of the PC strand 12 and the spiral steel pipe 13 connected to the removable inner bottom body 11 shown in Fig.
4 is a cross-sectional view showing the configuration of each pipe 18. As shown in Fig.
FIG. 5 is a cross-sectional view illustrating a prestressing steel pipe soil nailing structure and a shotcrete combination according to the present invention.
Fig. 6 is a view showing a schematic configuration of the stator socket 15 and the plate 17 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and advantages according to the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, the present invention will be described in detail with reference to the following embodiments. However, the present invention is not limited to the following embodiments.

FIG. 1 is a view showing a schematic structure of a nail anchor according to the conventional nail technique described in the above description. As shown in FIG. 1, a deep hole is drilled downward in the ground of the earth retaining wall 1, A reinforcement nail 2 as a deformed reinforcing bar is inserted into the perforated hole and then a grout material such as a mortar is injected and cured to form a grout high consolidation 3 and then a deformed reinforcing bar 3 And an end of the reinforcing nail 2 is fixed to the earth retaining wall 1 by using a supporting plate 4 and a fixing nut 5 or the like.

2 is a schematic view of a removable prestressed steel pipe soil nailing structure constructed in accordance with an embodiment of the present invention.

2, the prestressing steel pipe soil nailing structure according to the present invention is characterized in that a cement milk is filled in a drilled hole to form a perforation hole grouting 22, and a removable inner bottom body 11, a PC A stranded wire 12, a spiral steel pipe 13, and a cover pipe 14. [

A plurality of stator sockets 15 are formed outside the sheath pipe 14 to prevent the structures introduced into the perforated holes from being deviated and to be seated in the correct position. A connecting hole for connecting the hose 16 is formed so that the grouting hose 16 can be extended to the vicinity of the bottom of the perforation hole to facilitate the grouting injection work.

A shotcrete 21 is laid outside the ground or side wall of the perforation hole to prevent the soil or rock of the slope from being collapsed and stably maintained. The steel pipe 12 and the PC steel strand 12 are fixed to each other and the wedge cone 20 is formed at the upper end of the PC strand 12 to form the PC strand 12 ).

A cutting pipe 19 is formed between the pipe 18 and the wedge cone 20 so that an easy operation can be performed when the prestressing steel pipe sole nailing structure is removed.

The wedge cone 20 is configured to apply a tensile force to the PC strand 12 and can apply a compressive force using the repulsive force due to the tensile force of the PC strand 12 to the spiral steel pipe 13, The compressive force transmitted to the wedge cone portion 20 is applied to the spiral steel pipe pipe 13 through the cutting pipe 19 and each pipe 18. [

That is, due to the tensile force of the PC strand 12 and the force generated by the compressive force transmitted to the spiral steel pipe 13, the constructions become very strong and robust, and the compressed spiral steel pipe 13, The displacement of the force acting on the excavation surface acts on the ground around the perforation hole grouting 22 to cancel the tensile stress from the ground and to suppress the displacement in the vicinity of the excavation surface.

3 is a view showing the connection structure of the PC strand 12, the spiral steel pipe 13 and the removable inner bottom 11 of the structure shown in FIG. 2, wherein the PC strand 12 has a plurality of steel wires The removable inner bottom body 11 is inserted into the perforated hole grouting 22 and the removable inner bottom body 11 is inserted into the perforated hole grouting 22, Threaded portion formed on the inner circumferential surface of one end of the spiral steel pipe 13 inserted into the inner circumferential surface.

As the removable inner lower body 11, a conventional commercialized or mass-produced removable inner lower body or the like can be used. For example, in Korean Patent Laid-Open No. 10-2009-0039260 (published on Apr. 22, 2009, The configuration of the fixing member described in the conventional art 2) can be used.

The fixing member of the prior art 2 includes an outer cap for forming a fixing space in the filling member, a cone plate screwed to the inlet of the outer cap, a plurality of cones for binding one end of the nail member by the inclined surface of the cone plate, And a fixed stop that makes the cone plate and the plurality of cones come in close contact with each other, and releases the engaged state when hitting the nail member.

The nail member of the prior art 2 (corresponding to the PC stranded wire of the present invention) is converted into a form in which the nail member can be easily removed while the fixation force of the fixing member is released when a predetermined impact is applied, The nail member is bent or broken according to a predetermined striking force to cancel the fixing state of the nail member so that it can be removed at any time in case of disassembly work or the like.

However, this is described as an example of the removable inner bottom body of the present invention, and the present invention can be applied to a case where the structure of the prior art 2 is used, or other removable inner bottom body structures, And the present invention is not limited to the above-described configuration.

3 shows a longitudinal section of the spiral steel pipe 13. The spiral steel pipe 13 is positioned at the center of the PC strand 12 and the spiral pipe 13 in the radial direction. And a cover pipe 14 is formed on the outside.

The spiral steel pipe pipe (13) has a spiral shape on the outside of the steel pipe. Since the load and the repulsive force externally applied are uniformly distributed in the pipe, the steel pipe pipe is generally superior to the structural steel pipe pipe used for the construction work have.

Therefore, it is very advantageous for a pre-stressed steel pipe soil nailing structure in which a high load is applied, and it is advantageous in that it has a superior load-bearing capacity and can be configured in a lighter weight than a steel pipe structure, have.

The outer peripheral surface of the spiral steel pipe 13 is coated with a covering pipe 14. A female screw part is screwed to the removable inner lower body 11 at one end of the spiral steel pipe 13, It is possible to easily release it in the case of removing the steel pipe sole nailing structure or in the case where separation of the other spiral steel pipe pipe 13 is required.

The coating pipe 14 may be a synthetic pipe such as polyethylene (PE), polyethylene terephthalate (PET) or polyvinyl chloride (PVC) The surface clearance is facilitated when the spiral steel pipe pipe 13 is collected, and the frictional resistance is reduced to facilitate the separation.

Next, with reference to Fig. 4, each pipe 18 will be described.

4, each of the pipes 18 is used to fix a spiral steel pipe 13 to be embedded with a plate 17 attached to the outside of the shotcrete 21, (A cross-section AA ") at one end so as to cover both the portion where the spiral steel pipe pipe 13 protrudes and the insertion port of the plate 17, and the PC stranded wire 12) is formed (cross-section BB ").

That is, the insertion port of each pipe 18 is inserted into the spiral steel pipe pipe 13 and the cover pipe 14 protruding outside the plate 17, and the PC steel wire 12 extending inside the spiral steel pipe pipe 13 And extend outwardly through the center hole of each of the pipes 18.

As described above, each of the pipes 18 is used to fix the spiral steel pipe 13 to the plate 17, and the tensile force generated in the wedge cone 20 and the PC strand 12, which will be described later, (Compression force) against the tensile force acts to press and fix the plate 17 and the spiral steel pipe 13 at the excavation entrance.

FIG. 5 is an enlarged cross-sectional view showing a state of a pre-stressed steel pipe sole nailing structure completed in accordance with the present invention and an enlarged view of a combination of each structure.

5, the plate 17, the angular pipe 18, the cutting pipe 19, and the pipe 19 of the prestressed steel pipe sole nailing structures protruding from the inside of the perforated hole grouting 22 to the outside of the shotcrete 21, And a wedge cone part 20 and the like and more specifically to a PC strand 12 and a spiral steel pipe pipe 13 while fixing a spiral steel pipe pipe 13 to a shotcrete 21 on the opposite side of the perforation hole grouting 22. [ And a plate 17 having an insertion port formed at an intermediate portion thereof so that the cover pipe 14 and the cover pipe 14 extend outwardly and a plate 17 attached to the plate 17 for fixing the spiral pipe pipe 13, And the PC strand 12 is positioned at the upper end of each of the pipes 18 so that the PC strand 12 can be easily cut or removed, The pipe 19 for cutting, and the cutting pipe 19 And a wedge cone portion 20 for fixing and tensioning the PC stranded wire 12 extending from the end to the outside.

The wedge cone portion 20 may be a conventional commercialized or mass-produced wedge cone portion or the like. For example, the configuration of the fixing member shown in the above-mentioned prior art 2 can be used.

The fixing member of the conventional art 2 includes a cover plate for closing the entrance of the excavation hole, a plurality of wedge-type claws for fixing the nail member, a mounting and securing piece having a detachable wedge capable of tightening at the time of fastening, And the like.

According to the structure of the above-described prior art 2, after the mounting fixture is fitted to the nail member and brought into contact with the cover plate, the outer surface of the nail member is fixed by pressing from the wedge claw inside the detachable wedge by tightening the tightening nut to the detachable wedge And serves to press and fix the steel wire and the cover plate while maintaining such a fixed state.

However, this is illustrated as an example to illustrate the function of the wedge cone 20 to tension the PC strand 12 of the present invention, and the present invention may employ the same configuration as the prior art, And the like can be selectively used according to the needs of those skilled in the art, and are not limited to or limited to the above configuration.

That is, the tensile force is obtained by pulling the PC strand 12 through the configuration of the wedge cone 20 as described above, and the repulsive force corresponding to the tensile force is transmitted to the rigid cone 20 and the cutting pipe 19 The spiral steel pipe 13 and the plate 17 connected to the pipes 18 are compressed by the compression force so that the shotcrete 21 and the perforation hole grouting Can be more firmly fixed from the external stress generated in the ground or the side wall of the reinforcing member 22, and a stable reinforcing structure can be formed.

The cutting pipe 19 shown in FIG. 5 is used for removing or partially removing the prestressing steel pipe soil nailing structure of the present invention. For example, when a problem such as invading a neighboring district is encountered, It is a role to display the cutting position so that the structure can be removed, and it is possible for the operator to work after grasping the position of the cutting pipe 19 at the time of demolishing.

6 shows the stator socket 15 and the plate 17 in the configurations shown in Figs. 1 to 5, wherein the stator socket 15 has a larger diameter than the inner diameter And a connecting hole for fitting the grouting hose 16 to the outer peripheral surface of each end is formed at regular intervals along the circumferential direction.

The center of the plate 17 protrudes outwardly of the shotcrete 21 and the PC stranded wire 12, the spiral steel pipe 13 and the sheath pipe 14 are projected to the outside And an insertion port extending therefrom is formed.

Hereinabove, the preferred embodiments for carrying out the present invention have been described with reference to the drawings.

However, the above-described prestressing steel pipe soil nailing structure is not limited to the above-described embodiment, and anyone of ordinary skill in the art will be able to understand the present invention without departing from the gist of the present invention. Various modifications are possible.

11. Removable inner lower body 12. PC Strand
13. Spiral Steel Pipe Pipe 14. Coated Pipe
15. Stator socket 16. Grouting hose
17. Plate 18. Angle Pipe
19. Cutting pipe 20. Wedge cone part
21. Shotcrete 22. Perforated hole grouting

Claims (3)

Wherein the piercing hole is formed at an appropriate position of the side wall to insert a spiral steel pipe and grouting the space between the perforation hole and the spiral steel pipe to fill the cement milk and putting the excavation surface of the side wall with a shotcrete, In a steel pipe soiled nailing structure,
A PC stranded wire composed of a plurality of strands of steel wire, one end of which is connected to the removable inner bottom body,
A spiral steel pipe pipe which surrounds the entire outer surface of the PC stranded wire in the perforation hole and has a female threaded portion formed at one end thereof and is engaged with a thread of the removable inner bottom body;
A cover pipe surrounding the entire outer surface of the spiral pipe,
A plate attached to the shotcrete and having an insertion port for extending the PC stranded wire, the spiral steel pipe pipe and the sheath pipe to the outside,
An angled pipe attached to the plate and having an inclined end portion formed at one end thereof and passing through the PC stranded wire at the center of the other end;
And a wedge cone part for fixing the PC stranded wire extending outward from an end of the cutting pipe,
A plurality of stator sockets are attached to an outer surface of the sheath pipe drawn into the perforation holes. The stator sockets are symmetrical cylinders having a diameter larger than the inner diameter of the stator, and protrusions for engaging the grooves are formed on the outer surface. Wherein a groove for fitting a grouting hose is formed along the circumferential direction on the outer circumferential surface of the end so that the grouting hose can be extended to the vicinity of the bottom of the perforation hole to assist the grouting operation, The middle portion of the coated pipe, and the removable inner lower portion of the top end, respectively, so that the grouting hose extends to the bottom of the perforation hole,
The covering pipe is made of a synthetic resin made of polyethylene (PE), polyethylene terephthalate (PET) or polyvinyl chloride (PVC)
The PC stranded wire is configured to be able to be removed by bending or breaking due to a striking force,
The spiral steel pipe pipe is screwed to the removable inner lower body by an arm or a male part formed at one end, and is released from the removable inner lower body when the prestressing steel pipe sole nailing structure is dismantled. By the surface clearance with the sheath pipe Separable and removable,
And the PC stranded wire and the spiral steel pipe pipe are removed together when the prestressing steel pipe soil nailing structure is demolished
Features a removable prestressed steel pipe soil nailing structure. delete delete

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