KR101914901B1 - Reinforcement pile for ground improvement and earthquake-proof and its construction method - Google Patents

Abstract

The present invention relates to a reinforcement pile for ground improvement and earthquake resistance and, more specifically, relates to a reinforcement pile (100) for ground improvement and earthquake resistance, which is installed to be inserted into a drilled hole formed on the ground or the inside of a hollow portion of a conventional pile that is pre-installed in the drilled hole, and comprises: a plurality of steel bars (110) arranged in the shape of a ring at a predetermined distance; one or more grout injection pipes (120) provided in a core portion of the arranged steel bars (110); a plurality of coupling units (130) provided in accordance with a depth of the steel bars (110) and the grout injection pipes (120), and coupling and integrating the steel bars (110) and the grout injection pipes (120) with each other; first grout (140) formed at an external side of the grout injection pipes (120) to form appearance corresponding to a drilled hole or a hollow portion of a conventional pile; and second grout (150) injected through the grout injection pipes (120), and diffused and consolidated to the ground around the drilled hole. Moreover, through structural and material characteristics, factory manufacturing and site construction are selected or combined to conveniently construct the reinforcement pile. Therefore, earthquake resistance and the ground are reinforced to increase stability of a structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-

The present invention relates to a pile improvement and seismic strengthening pile and method of constructing the pile, and more particularly, to a pile (pile) which is installed in a penetrating pillar in the ground, It is possible to secure the stability of the structure by constructing the reinforcement file which can be alternatively or in combination with the factory manufacturing and field construction by realizing the high strength, miniaturization and light weight through the reinforcement of the structure and the earthquake resistance of the ground such as earthquake Gt; to < / RTI >

Generally, it is impossible to construct a direct foundation (shallow foundation) of a structure when a geological layer composed of soft ground such as sand, clay, and gravel layer is deeply distributed below the earth's surface in civil engineering and construction works.

If there is no soil with a sufficient depth, such as a sand bed with an N value of at least 30 or a clay layer with an N value of 20 or more in a rock bed or rock penetration test (SPT) If the depth is insufficient, the load of the structure can not be effectively transmitted to the ground as a direct foundation. As an alternative to this, a pile foundation (deep foundation) is installed as a base for supporting the structure.

A pile foundation is generally a long structural body with a ratio of penetration depth to foundation width of 4 or more, and is a foundation that is installed to a predetermined depth by impact or vibration. Thus, the load of the superstructure is supported and a high quality supporting force is transmitted to the lower layer.

Pile foundations are concrete piles such as RC, PC, and PHC, steel piles such as steel pipe, H type, I type, box type, spiral type, and concrete pipe composite piles such as SC depending on the material. In Korea, centrifugal force reinforced concrete piles and centrifugal force prestress piles are generally used as piles.

As a pile foundation, a Korean Registered Utility Model No. 20-0325151 will be described with reference to FIG. 7 (a), and a schematic structure of the pile foundation will be described. A hollow is formed to be inserted into the excavation portion 7 of the soft ground An H beam bell portion having a diameter larger than the diameter of the cylindrical steel pipe 15; a cylindrical coupling structure for forming a hollow to be welded to the H beam bell portion; And a concrete pipe 17 integrally formed with an H beam bell portion and a cylindrical steel pipe forming a hollow and forming an H beam bell portion and a hollow cylindrical pipe forming a hollow.

As another example, referring to FIG. 7 (b) of Korean Patent No. 10-0004436, when forming a pillar or columnar prestressed concrete pile, the same allowable stress as that of the concrete pile 1 (3) is embedded along the longitudinal direction of the concrete pile, and the grout re-introduction pipe is embedded in the inside of the concrete pile so as to extend to the lower end portion of the section steel.

As a method for constructing such a pile as described above, for example, as disclosed in Korean Patent Laid-Open Publication No. 10-2004- 0093536, a piercing step of penetrating a large diameter steel pipe at the same time as piercing, And inserting an injection tube equipped with a packer while remaining in the hole, and injecting and reinforcing the grout material.

Korean Registered Utility Model No. 20 - 0325151 (September 2, 2003) Korean Patent No. 10-0004436 (November 7, 1974) Korean Patent Publication No. 10-2004-0093536 (November 11, 2004) Korean Patent No. 10-1567358 (Nov. 10, 2015)

The pile foundation to which the conventional technique as described above is applied is configured to transmit the load of the upper structure to the ground through the ground bottom pressure acting on the bedrock and the resistance of the pile.

However, when the settlement of the soft ground is larger than the settlement amount of the pile in the soft ground, the pile foundation of the prior art as described above generates a frictional force on the negative side acting as a downward frictional force, There is a problem that it causes the subsidence of the ground and the cracks of the structure.

Therefore, the prior art has a structural limitation in that it is required to provide the pile foundation to the large-diameter and large-diameter roads in order to protect the structure from the horizontal lateral force acting when the earthquake occurs.

However, it is necessary to mobilize a large crane or large piercing equipment for the construction of large and large diameter pile foundations.

As a result, the pile foundation of the prior art has problems such as generation of various kinds of noise and dust according to the use of large construction equipment, environmental problems such as a large amount of slime treatment due to large piercing, damage to other buildings adjacent to the construction site , And over-construction of the construction cost. Thus, there is a great difficulty in construction.

Further, as the pile foundation of the conventional structure has a deeper depth of the soft ground, the construction period and the cost are exponentially excessive, resulting in problems such as lowering workability and economical efficiency.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art,

A ground improvement and seismic retrofitting pile (100) installed in a hole formed in the ground or installed in a hollow of a conventional pile installed in the piercing hole,

The reinforcement file (100)

A steel bar 110 for arranging a plurality of annular rings at regular intervals,

One or more grout injection pipes 120 provided at the core of the arranged steel rods 110,

A bundling unit 130 having a plurality of grooves at arbitrary intervals according to the depths of the steel bar 110 and the grout injection pipe 120 and bonding the steel bar 110 and the grout injection pipe 120 together,

A first grout 140 formed outside the grout injection pipe 120 to form a perforation hole or an external shape corresponding to the hollow of the existing pile,

And a second grout (150) injected through the grout injection tube (120) and diffused and solidified into the perimeter of the perforation hole;

In the reinforcing pile 100, the steel rods to the first grout 110 to 140 may be integrally manufactured at the factory and the second grout 150 may be formed at the time of site construction, 130 are integrally manufactured at the factory and the first to second grout 140 to 150 are constructed at the time of field construction.

In addition, the steel rod 110 may be,

It is made up of one or more selected from special resistant steel, steel pipe, H-shaped steel, glass fiber reinforced plastic (GFRP) reinforced steel, and Basalt fiber reinforced plastic (BFRP) reinforced steel.

In addition, the grout injection pipe 120 may be formed,

A pipe sleeve of a seismic steel pipe, or a plastic pipe sleeve of a material selected from PE, PP, PVC, and fiber reinforced plastic (FRP)

A plurality of grout diffusion holes 121 are radially formed along the outer circumferential surface of the grout injection tube 120 and a finishing material 122 is attached to the outer surface of the grout diffusion hole 121.

Further, the binding portion 130 may be formed of a metal,

A connection space 131 formed in a plate shape or a linear binding wire 134 is used alternatively or in combination to bind the steel rod 110 and the grout injection pipe 120 together,

The connection space (131)

And a plurality of receiving grooves 133 which are arranged in an annular shape on the outer circumferential surface of the plate and accommodate the steel rods 110. The plurality of receiving grooves 133 are formed in the plate-

Meanwhile, in the method of constructing the ground reinforcement and seismic retrofit pile 100 of the present invention,

The steel rods 110, the grout injection pipes 120, the binding portions 130 and the first grout 140 are integrally manufactured from the reinforcement file 100 and then transported to the site, (S11) of penetrating the hollow of the existing file installed in the hole or perforation hole,

An A-type process including inserting a packer into a grouting pipe 120 of a reinforcement file, and injecting a second grout 150 and diffusing the grout into the ground through a grout diffusion hole 121;

Alternatively, the steel rod 110, the grout injection pipe 120, and the binding unit 130 are integrally manufactured in the factory and then transported to the site from the reinforcement file 100, and then the perforation hole or the perforation hole A step S21 of penetrating the hollow of the existing file installed,

A step (S22) of installing a grouting hose in a lower part of the perforation hole and injecting a first grout 140 to an upper ground,

Type process including the step of inserting the packer into the grout injection pipe 120 of the reinforcement file and then injecting the second grout 150 and diffusing the grout into the ground through the grout diffusion hole 121; As shown in FIG.

Therefore, it is possible to achieve the purpose of providing a ground improvement and seismic strengthening pile having excellent storability and earthquake resistance and excellent workability and a construction method thereof.

According to the present invention, reinforcing piles having structural characteristics of integrating a steel rod, a grout injection pipe, a binding portion and a grout into the ground are implemented to provide an effect of enhancing vibration resistance and ground improvement.

That is, according to the present invention, reinforcing piles having high strength, small diameter, and light weight can be constructed through structural and material characteristics, so that factory production and field construction can be easily selected or combined.

Therefore, it has high durability, abrasion resistance, corrosion resistance, and long-term stability of reinforced pile without restriction of narrow construction site because of excellent workability, handling property, and economical efficiency and has excellent resistance to tensile force and excellent elasticity. Stability of the structure can be ensured by eliminating the shear phenomenon even if horizontal lateral forces such as earthquakes act on the strata.

Particularly, while the prior art pile foundations generate various frictional forces in soft ground such as sand, clay and gravel layer, resulting in various problems such as reducing the bearing capacity of the pile and impeding the stability of the structure, It is advantageous in that the supporting property is exhibited by the frictional force at the main surface and the superstructure and the reinforcement pile act together with the ground to ensure stability.

Further, according to the present invention, as the grout is diffused and solidified into the pores of the reinforcing pile and the soft zone of the ground, the grout is integrated with the ground to increase the shear force of the ground, thereby reinforcing the rigidity of the soft ground, (Waterproofing) and liquefaction prevention effect can be simultaneously obtained from the soft ground that has been saturated with the soil.

In addition, the present invention can be expected to provide additional reinforcement and earthquake-proof effects by installing it alone in the perforation hole or by installing it in the hollow of a conventional established pile.

1 is a perspective view of a ground improvement and seismic retrofit file according to the present invention.
2 is a plan view of a ground improvement and seismic retrofit file according to the present invention.
Fig. 3 is a front view schematically showing the internal structure seen from the direction AA in Fig. 2; Fig.
4 is an exploded perspective view of a ground improvement and seismic retrofitting pile according to the present invention.
5 is a diagram illustrating an example of a construction method of a ground improvement and seismic retrofit file according to the present invention.
6 is a perspective view showing another embodiment of a method of constructing a ground improvement and seismic retrofitting pile according to the present invention.
7 shows an example of a pile file according to the prior art;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure and operation of a ground improvement and seismic retrofit file and a construction method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of parts that can be easily implemented by those skilled in the art may be omitted.

1 is a perspective view of a ground improvement and seismic strengthening pile according to the present invention, Fig. 2 is a plan view of a ground improvement and seismic retrofitting pile according to the present invention, Fig. 3 is a front view Fig. 4 is a perspective view of the ground improvement and seismic retrofitting pile according to the present invention, Fig. 5 is an illustration of the ground improvement and seismic retrofitting pile construction according to the present invention, Fig. FIG. 7 is a perspective view showing another embodiment of the file. FIG. 7 shows an example of a pile file according to the prior art.

The ground improvement and seismic retrofit file and the construction method to which the technique of the present invention is applied are configured to construct a reinforcing pile 100 of high strength through the structural and material characteristics of the pile foundation, It is noted that the present invention relates not only to the stability of the structure according to the construction work, but also to the reinforcement file capable of increasing the earthquake resistance and the grounding force of the ground, especially with respect to lateral lateral forces such as earthquakes.

To this end, the ground improvement and earthquake-proofing pile 100 of the present invention comprises a perforation hole formed in the ground, or a reinforcing pile 100 installed in the hollow of an existing pile 200 installed in the perforation hole Specifically, it is as follows.

As shown in Figs. 1 and 2, the reinforcing pile 100 of the present invention includes a steel bar 110 that arranges a plurality of annularly arranged annular spacers.

In the embodiment of the present invention, the steel rod 110 has a circular cross-sectional shape, but it may be variously shaped and the number of the arranged steel rods 110 may be variously configured.

Particularly, the steel rod 110 of the present invention is made of special reinforcing steel, steel pipe, H-shaped steel, glass fiber reinforced plastic (GFRP) reinforcing steel, and BAZRP fiber reinforced plastic (BFRP) Reinforcing rods, and reinforcing rods.

The above-mentioned special reinforcing steel bars consist of steel bars for reinforced concrete structures of SD400S, SD500S and SD600S of the Korean Industry Standard (KS D 3504). Each has a yield strength of 400 ~ 600Mpa and has seismic seismic performance.

The above steel pipe is SPS, SPAP for seismic resistant steel pipe and seismic resistant steel structure which are made of SN steel for high performance construction structure or TMCP steel for building structure of KS D 3864 standard.

The H-section steel is a hot-rolled (SHN) H-section steel for building structure of the Korean Industry Standard (KS D 3866).

The glass fiber reinforced plastic (GFRP) is a material obtained by combining aromatic nylon fibers such as glass fiber, carbon fiber, and Kevlar with a thermosetting resin such as unsaturated polyester or epoxy resin. GFRP rebar is stronger than general steel, durability, impact resistance, corrosion resistance, lightweight than aluminum and excellent in workability.

The above-mentioned Basalts Fiber Reinforced Plastics (BFRP) has a very high strength to weight ratio and is excellent in internal resistance and fatigue resistance. The maximum tensile strength of BFRP reinforcement is about 4 times higher than that of ordinary steel reinforcement.

The steel rod 110 made of the special reinforcing steel, the steel pipe, the glass fiber reinforced plastic reinforcing bar and the Baathal fiber reinforced plastic reinforcing bar is formed by bolting the support plate on the upper part in order to exert an effective tensile force and applying the post tension, .

A first connection part 111 is formed at the upper and lower ends of the steel rod 110 and a plurality of steel rods 110 are connected in the longitudinal direction by coupling the first connection part 112.

The first connection unit 112 may be formed in the form of a predetermined coupling unit that couples the first connection unit 111 to the first connection unit 111 in a male coupling manner. If necessary, the first connection unit 111 may be connected .

Meanwhile, the reinforcing pile 100 of the present invention includes one or more grout injection pipes 120 provided at the core of the steel rod 110 arranged as described above.

The grout injection pipe 120 is installed in the perforation hole or the existing pile 200 after the reinforcement pile 100 is poured into the second grout 150 through a series of processes, have.

The grout injection pipe 120 is made of a plastic pipe sleeve of a material selected from an earthquake-resistant steel pipe sleeve or PE, PP, FRP, or PVC.

In the embodiment of the present invention, as shown in FIG. 2, one grout injection pipe 120 is installed at the center of a plurality of steel rods 110, but one or more grout injection pipes 120 may be provided as required.

Seismic Steel Pipe The grout injection pipe (120) made of a pipe sleeve is made of a steel pipe of the Korean Industry Standard (KS D 3864), an inner seismic steel pipe made of a SNCP steel or a TMCP steel material for a building structure in a circular shape, , SPAP). Therefore, when the grout injection pipe 120 remains in the ground even after the second grout 150 is injected, the reinforcing pile 100 can be further reinforced with the steel rod 110.

A plurality of grout diffusion holes 121 are radially formed along the outer circumferential surface of the grout injection tube 120 and a finishing material 122 is attached to the outer surface of the grout diffusion hole 121.

The plurality of grout diffusion holes 121 are formed with a predetermined size and spacing so that the second grout 150 injected into the grout injection pipe 120 is uniformly discharged and diffused to the outside.

That is, when the second grout 150 is pushed into the grout injection pipe 120 by the packer, the second grout 150 is extruded and diffused into the cavity and the ground in the hole through the radial grout diffusion hole 121, The grout injection pipe 120 and the following binding unit 130 can be formed by integrating the first grout 140 and the second grout 150 in the ground.

The finish material 122 is attached to the grout diffusion hole 121 by using a predetermined rubber band or tape and the grout diffusion hole 121 is opened by the pressure of the packer when the second grout 150 is extruded, So as to effectively spread.

A second connection part 123 is formed at the upper and lower ends of the grout injection pipe 120 and a plurality of grout injection pipes 120 are connected in the longitudinal direction by coupling the second connection part 124. [ do.

The second connection unit 124 may be formed in the form of a predetermined coupling that couples the second connection unit 123 to the second connection unit 123 in a male connection manner. If necessary, the second connection unit 123 may be connected .

The reinforcement pile 100 according to the present invention includes a plurality of reinforcing piles 100 at arbitrary intervals according to the depths of the steel rods 110 and the grout injection pipes 120 and the steel rods 110 and the grout injection pipes 120 are connected to each other And includes a binding portion 130.

As shown in FIG. 2 or 4, the coupling unit 130 may include a connection space 131 formed in a plate-like shape, or a linear coupling wire 134 in combination or in combination with the steel rod 110 and the grout injection pipe 120 ).

The connection space 131 is formed in a plate-shaped core portion and includes a binding hole 132 for receiving the grout injection tube 120 and a plurality of receiving grooves 133 . Accordingly, the grout injection tube 120 and the steel rod 110 are fixed and fixed while maintaining a constant gap therebetween.

The binding wire 134 integrally restrains the steel rod 110 and the grout injection pipe 120 from the outside of the connection space 131. The upper and lower spacing of the connection space 131 and the binding line 134 is preferably 50 cm or less, but the range can be changed as necessary.

The reinforcing pile 100 of the present invention includes a first grout 140 formed outside the grout injection pipe 120 and forming a perforation hole or an external shape corresponding to the hollow of the existing pile 200, And a second grout 150 that is injected through the first grout 120 and diffuses and solidifies into the perimeter of the perforation hole.

The first grout 140 and the second grout 150 are made of cementitious grout or chemical grout (chemical grout). The first grout 140 is injected into the perforation hole by gravity grouting and the second grout 150 is injected through the grout injection tube 120 by packer grouting to form the reinforcement pile 100 as shown in Figure 5 It is made to integrate into the ground and solidify the soft ground to strengthen the ground.

5, the reinforcement file 100 of the present invention may be installed in the perforation hole formed in the ground, or may be formed as an existing file as shown in Fig. 6 200 of the present invention. The existing file 200 may be a conventional centrifugal force reinforced concrete pile or a centrifugal force prestressed pile. At this time, in order to diffuse the second grout 150 of the present invention on the ground, It is preferable that a predetermined diffusion hole 211 corresponding to the diffusion hole 121 is formed.

Hereinafter, a construction method of the ground improvement and earthquake-proofing pavement 100 to which the technique of the present invention having the above-described structure is applied will be described. It is to be understood that the present invention is not limited to the following embodiments, and various modifications may be made without departing from the scope of the present invention. .

The method of constructing the ground improvement and seismic retrofit file 100 having the above-described construction is largely divided into an A-type process by factory production and a B-type process by field construction.

First, a perforation hole of a certain diameter is drilled using a perforator equipped with a perforated bit on the ground where the construction work is to be carried out, and a casing (not shown) is installed so that the perforated wall is not collapsed to the required depth.

The A type process is a process in which the steel rods 110, the grout injection pipes 120, the binding portions 130 and the first grout 140 are integrally manufactured in the reinforcing pile 100, A step S11 of penetrating the hollow of the existing pile 200 provided in the perforation hole or perforation hole formed in the ground,

A step S12 of inserting a packer into the grout injection pipe 120 of the reinforcement file 100 and injecting the second grout 150 and diffusing the grout into the ground through the grout diffusion hole 121.

In step S11, a steel rod 110 made of a material selected from special reinforcing steel, steel pipe, H-shaped steel, glass fiber reinforced plastic (GFRP) reinforcing steel and Baathal fiber reinforced plastic (BFRP) reinforcing steel, And a grout injection pipe 120 made of a plastic pipe sleeve.

The plurality of steel rods 110 and the grout injection pipes 120 are connected to each other in the longitudinal direction according to the depth of the perforation hole. That is, the plurality of steel rods 110 are connected to each other by connecting the first connection portions 111 formed at the upper and lower ends to each other and connecting the first connection means 112, and the plurality of grout injection pipes 120 are also connected to the upper and lower ends And the second connection unit 124 is connected to the second connection unit 123. [

The steel rods 110 are arranged at regular intervals in an annular shape, and the grout injection pipes 120 are disposed in the deep portions of the steel rods 110. The first grout 140 can be sufficiently filled with the gap between the steel rod 110 and the grout injection pipe 120 at a predetermined interval.

The steel rod 110 and the grout injection pipe 120 are bundled together by the bundling unit 130 and integrated into the reinforcement pile 100.

The binding unit 130 may alternatively or in combination of a connection space 131 and a binding line 134. A grout injection tube 120 is accommodated in the binding hole 132 of the connection space 131 and a steel rod 110 is accommodated in the receiving groove 133 to form a stable structure with a certain distance from each other. ) To constrain the outside of them into a reinforcement file (100).

A first grout 140 is formed on the outside of the grouting pipe 120 in the reinforcing pile 100 to form a perforation hole or a contour corresponding to the hollow of the existing pile 200. Therefore, the reinforcing pile 100 in which the steel rod 110, the grout injection pipe 120, the coupling part 130, and the first grout 140 are integrated is manufactured as a factory and transported to the site, And penetrates into the hollow of the existing file 200 installed in the installed casing or the perforation hole to be installed as shown in FIG. The reinforcement file 100 in which the steel rods 110, the grout injection pipe 120, the binding unit 130 and the first grout 140 are integrated in the manufacturing process of the existing file 200, The second grout 150 may be shipped in the hollow state of FIG.

The packer is inserted into the grout injection pipe 120 of the reinforcement file 100 and the second grout 150 is injected and diffused into the ground through the grout diffusion holes 121 in the step S12.

The packer expands step by step from the base of the grout injection pipe 120 to inject the second grout 150 into the grout injection pipe 120 and pressurize the grout 150 by the pressure of the second grout 150, The finishing material 122 attached to the grout diffusion hole 121 formed in the injection pipe 120 may be punctured or dropped and the second grout 150 may be radially outwardly inserted into the grout injection pipe 120 as shown in FIG. .

The second grout 150 to be extruded not only fills the gap between the steel rod 110, the grout injection pipe 120 and the coupling part 130 in the perforation hole, but also diffuses into the ground and solidifies. The second grout 150 is extruded into the ground via the first grout 140 injected into the existing file 200 and the diffusion hole 211 of the existing file 200. In this case, It goes through the process of diffusion. Accordingly, the reinforcing pile 100 is stably integrated into the ground, and the soft ground is strengthened and stabilized through the ground improvement, thereby obtaining the effect of preventing the water shielding and liquefaction.

According to the present invention, the grout injection pipe 120 may be removed after the packing grouting is completed, but if it remains, the reinforcing pile 100 together with the steel rod 110 can be more stably secured and the ground reinforcement property .

In the B type process, the steel rod 110, the grout injection pipe 120, and the binding part 130 are integrally manufactured in the factory and then transported to the site in the reinforcing pile 100, (S21) of penetrating the hollow of the existing file (200) provided in the perforation hole,

A step (S22) of installing a grouting hose in a lower part of the perforation hole and injecting a first grout 140 to an upper ground,

A step S23 of inserting the packer into the grout injection pipe 120 of the reinforcement file 100 and then injecting the second grout 150 and diffusing the grout into the ground through the grout diffusion hole 121.

That is, in the B type process, the steel rod 110, the grout injection pipe 120, and the binding unit 130 are integrated with each other in the reinforcement file 100 in the step S21, Or by penetrating the hollow of the existing file (200).

After the installation, in step S22, the casing is pulled out and removed from the perforation hole, and a grouting hose is installed in the lower part of the perforation hole to inject the first grout 140 to the upper surface.

That is, the grouting hose is installed between the perforation hole and the steel rod 110 of the reinforcement pile 100, and injects the first grout 140 from the cooperative. The slime remaining in the ball through gravity grouting is discharged along with the casing to the ground and recovered. When gravity grouting is completed, caulking is performed between the upper surface of the perforation hole and the grouting injection pipe to seal the first grout 140 so that the first grout 140 does not flow upward.

In step S23, the packer is inserted into the grouting pipe 120 of the reinforcement file 100, and the second grout 150 is injected and diffused and solidified on the ground through the grout diffusion holes 121.

As described above, since the reinforcement file 100 of the present invention realizes the reinforcement file 100 of high strength with small diameter and light weight through the structural and material characteristics different from the prior art, it can be manufactured And it is easy to carry, install and construct.

As described above, the ground improvement and seismic retrofit file and the construction method thereof according to the present invention can be applied to a steel rod 110 having a material characteristic different from that of a conventional pile foundation such as reinforcing bars for reinforcing concrete and GFRP, The present invention provides a pile foundation that realizes a reinforced pile 100 that integrates a pile base 130 with a first grout 140 and a second pile 150 together to provide high pile foundation resistance and earthquake resistance.

Therefore, the reinforcing pile 100 according to the present invention has a small diameter and a light weight, and at the same time, the reinforcing pile 100 having a high strength is formed in the ground to provide excellent workability and economical efficiency. Further, the reinforcing pile 100 has durability, abrasion resistance, The stability of the foundation of the pile is ensured even if lateral force such as earthquake acts on the soft ground layer.

Particularly, since the upper structure and the reinforcement pile 100 are constructed so as to be able to behave integrally with the ground, the stability of the reinforcement pile 100 is increased as the ground improvement is performed by increasing the shear force of the ground, And it is possible to simultaneously obtain the effect of preventing the liquefaction and liquefaction, so that the possibility of industrial use is expected to be very high.

100: reinforcement file
110: steel rods
111: first connection portion
112: first connecting means
120: Grout injection pipe
121: Grout diffusion hole
122: Finishing material
123: second connection portion
124: second connecting means
130:
131: Connection space
132: Coupling hole
133: receiving groove
134: Bond line
140: 1st grout
150: second grout
200: existing file
211: diffusion hole
300: ground
310: Perforated hole

Claims (5)

A steel bar 110 for arranging a plurality of annular rings at regular intervals; A grout injection pipe (120) having one or more at the core of the arranged steel rods (110) and forming a grout diffusion hole (121) radially in the outer circumferential surface; A connecting space 131 or a linear binding wire 134 having a binding hole 132 for accommodating the grout injection tube 120 and a plurality of receiving grooves 133 for accommodating the steel rod 110 may be alternatively or in combination A ground improvement and seismic retrofit pile (100) comprising a plurality of coupling portions (130) for coupling and integrating the steel rods (110) and the grout injection pipes (120)
The reinforcing pile 100 may be provided in a perforated hole formed in the ground or in a hollow of the existing pile existing in the pore hole and forming the diffusion hole 211,
In the reinforcement file 100,
A first grout 140 formed by gravity grouting outside of the grout injection tube 120 to form a perforation hole or a contour corresponding to the hollow of the existing pile; And
A second grout 150 which is pressurized by packing grouting inside the grout injection pipe 120 and extruded through the grout diffusion hole 121 and diffused and solidified to the ground around the perforation hole and integrated with the reinforcement pile 100, Lt; / RTI >
On the outer surface of the grout diffusion hole 121,
And a finish material 122 that closes the grout diffusion hole 121 when the first grout 140 is injected and attaches itself to the grout diffusion hole 121 when the second grout 150 is extruded,
The reinforcement file (100)
The steel rods to the first grout 110 to 140 may be integrally manufactured at the factory and the second grout 150 may be formed at the time of site construction or the steel rods or the binding portions 110 to 130 may be integrally manufactured at the factory Wherein the first grout to the second grout (140 to 150) are constructed and provided at the time of site construction. delete delete delete A method of constructing a ground improvement and seismic retrofit pile (100) according to claim 1,
The steel rods 110, the grout injection pipes 120, the binding portions 130 and the first grout 140 are integrally manufactured from the reinforcement file 100 and then transported to the site, (S11) of penetrating the hollow of the existing pile installed in the piercing hole and forming the diffusion hole 211,
The packing is inserted into the grouting pipe 120 of the reinforcement file to press the second grout 150 and the grout diffusion hole 121 is closed at the time of manufacturing the first grout 140 in the step S11, Type process including a step (S12) of spreading and solidifying the finishing material (122) attached to the perforation hole (122) through the second grout (150) to the ground around the perforation hole while being extruded; or,
The steel rod 110, the grout injection pipe 120 and the binding unit 130 are integrally manufactured from the reinforcement file 100 and then transported to the site. The steel rod 110 is installed in the perforation hole or perforation hole formed in the ground, (Step S21) of penetrating the hollow of the existing file forming the hole 211,
A step of injecting a first grout 140 to an upper surface by providing a grouting hose at a lower portion of the perforation hole on the outer side of the grout injection pipe 120 to which the finishing material 122 is attached on the outer surface of the grout diffusion hole 121 S22)
The second grout 150 is inserted by inserting the packing into the grout injection pipe 120 of the reinforcement file and the finishing material 122 attached to the grout diffusion hole 121 to close the grout diffusion hole 121 in the step S22, Type process including a step (S23) of diffusing and solidifying to the ground around the perforation hole while being extruded through the through-hole (150); The method comprising the steps of: (a)

Images