KR20170140144A - Pile with reinforced tip and its construction method thereof - Google Patents

Abstract

Disclosed are a pile with a reinforced tip manufactured by a double pipe tip reinforcing unit and a construction method thereof. The pile with a reinforced tip comprises: an internal steel pipe coupled to a lower end of a precast pile, and formed to correspond to an internal diameter or an external diameter of a bored pile; and an external steel pipe spaced from the internal steel pipe at a predetermined distance, and formed to surround an outer circumferential surface of the internal steel pipe. A bottom surface of the double pipe tip reinforcing unit is opened to pass through slime remaining on an excavated ground floor surface (G) to be directly supported by the excavated ground floor surface (G).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an end reinforcement pile fabricated using a double pipe end reinforcement,

More particularly, the present invention relates to an end reinforcing pile fabricated using a double pipe end reinforcing portion and a method of manufacturing the same, and more particularly, to a double pile end reinforcing portion coupled to a lower end portion of an existing pile, The present invention relates to an end reinforcement pile fabricated using a double pipe end reinforcement and a construction method thereof.

The pile foundation is a foundation to be installed by type pile method, buried pile method, and cast-in-place pile method when a good quality support layer such as rock layer is deep in the ground.

Type pile method is a method in which an existing pile is directly attached to the ground, and the pile-up method is a method of forming a perforation hole in the ground and then piling an existing pile into the perforation hole. And reinforced concrete is put in the drilled hole.

The pile-up method was developed to reduce the construction pollution such as noise and vibration by piling pile-shaped piles in the ground by excavating the ground. After the steel pipe pile or PHC pile was vertically purchased in the excavated ground Cement pool is injected to fix steel pipe pile.

The bearing capacity of the pile supported in the ground after the steel pipe pile or PHC pile is embedded is greatly influenced by the end bearing capacity determined by the effective sectional area of the tip. Therefore, the expansion of the effective cross-sectional area of the tip is reflected as a very important design factor in the steel pile pile.

However, when the steel pipe pile or PHC pile for the buried pile method is embedded in the ground, if the tip of the steel pipe pile or the PHC pile is supported on the slime generated during excavation work, the bearing capacity of the steel pipe pile or PHC pile is weakened .

That is, when the slime precipitated after excavation is not removed, there is a problem that the strength of the concrete is lowered, the pile end bearing capacity is lowered, and the upper structure due to the settlement is displaced.

Here, slime refers to the bentonite used to prevent the collapse of the pore wall during excavation and the wastes that have been deposited in the cooperative without being discharged to the ground.

In order to solve the problems of such a buried pile method, Japanese Patent Laid-Open No. 10-1075922 discloses a steel pipe pile for a buried pile method in which a tip portion is reinforced.

1, a hollow disk-shaped flange 20 is horizontally coupled to the lower end of a steel pipe pile 10 to increase the effective cross-sectional area supported by the steel pipe pile in the ground, And a hole is formed in the flange, so that the slime generated during the drilling operation can be improved.

However, even if the flange 20 of the steel pipe pile for embedding pile is formed, the slime can not be removed even if the hole 22 is formed, and even if the flange is still located on the slime and the slime is thickened, There is a problem that the pile end bearing capacity of the pile decreases in the long term due to consolidation or the like.

In addition, in the case of a high-strength pile or a large-diameter pile, it is difficult to secure a bearing capacity capable of coping with a proof stress, thereby failing to efficiently use the material.

The steel pipe pile 10 for a buried pile forming method may be formed simply as an empty space 12 between the outer pipe 30 and the steel pipe 10 so as to improve the bearing capacity of the steel pipe pile And there is a problem that the structural stability between the outer pipe and the steel pipe is deteriorated.

(Prior Patent Literature 0001) Korean Patent No. 10-1075922 (entitled: Steel pipe pile for reinforced end pile method, published on July 7, 2010)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a double pipe end reinforcement portion supported by a tillage ground through a slime, And the pile of closure is formed by closing the end of the pile, so that the load of the upper pile is uniformly transmitted to the ground, and the end supporting force can be additionally secured. And to provide a method for solving the problem.

As another means for accomplishing the above object, there is provided an end reinforcement pile fixedly supported at a distal end of a ready-made pile having a center hole and an open end,

An inner steel pipe coupled to a lower end of the pre-formed pile and corresponding to an outer diameter of the pre-formed pile, the inner pipe being formed at a lower portion of the front end reinforcing pile; And an outer steel pipe spaced apart from the inner steel pipe by a preset distance and formed to be smaller than the length of the inner steel pipe so as to surround an outer circumferential surface of the lower portion of the inner steel pipe, It is of course possible that the outer steel pipe is formed to correspond to the height of the slim S by directly passing through the slip S remaining on the bottom surface G and being supported directly on the bottom surface G of the digging ground.

Preferably, the apparatus further includes a shear connection member formed radially inside or outside the inner steel pipe, a steel pipe connecting member connecting the inner steel pipe and the outer steel pipe, and a reinforcing rib radially fixed to the upper end of the inner steel pipe can do.

Preferably, the cylindrical pile connected to the double pipe end reinforcing part is filled in the casing with a predetermined height and then inserted into the casing, so that the double pipe end reinforcing part can form a closed end by the filler.

According to another aspect of the present invention, there is provided a method of constructing a reinforcement pile fabricated by using a double pipe end reinforcement, comprising the steps of: (a) pulling out a drilling device from a casing inserted at a predetermined distance from the drilling hole; (b) filling the filling material with a predetermined height into the casing, the bottom of which is supported by the bottom surface (G) of the excavating soil; (c) inserting a tip reinforcement pile fabricated using the double tube end reinforcement and the prepared pile into the casing filled with the filler;

(d) further pouring a filling material between the casing and the casing and the excavation hole and drawing the casing; And (e) the upper end of the reinforcing pile fabricated using the double pipe end reinforcing portion is touched to directly support the double pipe end reinforcing portion through the slime S to be directly supported on the bottom surface G of the piercing ground, And further injecting a filler using an injector up to a portion where the slime S is formed.

Also, preferably, in the step (b), it is of course possible that the double pipe end reinforcing portion forms a closed end by the filler.

According to the present invention, the inner steel pipe and the outer steel pipe are spaced apart from each other by a predetermined distance to be able to stably support the pre-formed pile, and the upper and lower portions are formed as hollow pipes communicating with each other. Is directly supported on the surface.

Accordingly, it is possible to solve the problem that the supporting force is weakened by the slime by preventing the slim from being present between the bottom of the double pipe end reinforcing portion and the bottom of the excavation soil, and the problem of additional settlement can be solved, The tip reinforcement pile fabricated using the double pipe end reinforcement is formed.

In addition, according to the present invention, a filling material such as cement paste is installed in the inside of the double tube end reinforcement portion, thereby forming a closed pile, thereby evenly transferring the load of the existing pile to the ground, and further improving the end bearing capacity.

In addition, since the double tube end reinforcing portion is formed of the inner steel pipe and the outer steel pipe, the present invention is very easy to extend the leading end, thereby securing the design supporting force. In particular, it is possible to secure the bearing capacity to cope with the strength when used for high-strength piles and large-diameter piles, and to form a reinforced pile fabricated using a structurally stable double pipe end reinforcement.

1 is a cross-sectional view of a conventional steel pile pile with a reinforced tip according to the prior art.
FIGS. 2A and 2B are a sectional view and an exploded perspective view of a tip reinforcement pile fabricated using a double pipe end reinforcement according to an embodiment of the present invention;
FIGS. 3A and 3B are a perspective view and a cross-sectional view of a PHC pile and an end reinforcement pile fabricated using a double pipe end reinforcement according to an embodiment of the present invention;
3C and 3D are a combined perspective view and a cross-sectional view of a steel pipe pile and a reinforcement pile fabricated using a double pipe end reinforcement according to an embodiment of the present invention,
4A and 4B are a sectional view and an exploded perspective view of a tip reinforcement pile fabricated using a double pipe end reinforcement according to another embodiment of the present invention,
FIG. 5 is a view showing a construction procedure of a method of constructing an end reinforcement pile fabricated using a double pipe end reinforcement according to an embodiment of the present invention.
6 is a view showing a construction procedure of a method of constructing a reinforcement pile fabricated using a double pipe end reinforcement according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[End reinforcing pile fabricated by using the double pipe end reinforcing portion 100a (Example 1)] [

In the first embodiment, when a pile such as a PHC file or a steel pipe file is connected to the double pipe end reinforcing portion 100a and the prepared pile 200 or 300 in the end reinforcing pile fabricated using the double pipe end reinforcing portion 100a can do.

First, a configuration in which a tip reinforcement file is connected to a PHC file 200 as an established pile in an end reinforcement file manufactured using the double pipe end reinforcement of the present invention will be described.

2A and 2B are a cross-sectional view and a partial exploded perspective view of a tip reinforcement pile fabricated using a double pipe end reinforcement according to an embodiment of the present invention. FIGS. 3A and 3B are cross- Sectional view showing the combination of the reinforcing portion and the PHC pile.

Referring to FIGS. 2A, 2B, 3A and 3B, the end reinforcement pile and the PHC pile manufactured using the dual pipe end reinforcing part according to an embodiment of the present invention are connected to the lower end of the PHC pile 200, It can be seen that the upper end of the double pipe end reinforcing portion 100a is connected and fixed and the lower end portion of the double pipe end reinforcing portion 100a is supported on the bottom surface G of the excavating ground.

First, the double pipe end reinforcement portion 100a is formed to include an inner steel pipe 110a, an outer steel pipe 120a, a shear connecting member 130a, a steel pipe connecting member 140a, and a reinforcing rib 150a.

The inner steel pipe 110a is coupled by a lower end of the foundation pile 200 and a coupling part (not shown), and is formed to have an inner diameter corresponding to an inner diameter of the PHC pile 200 as a foundation pile.

However, it is of course possible that the inner diameter of the inner steel pipe 110a is formed to be larger or smaller than the inner diameter of the foundation pile 200.

A reinforcing rib 150a is formed on the upper portion of the inner steel pipe 110a and the upper end portion of the outer steel pipe 120a so that the formed pile 200 can be stably supported on the double pipe end reinforcing portion 100a.

The inner steel pipe 110a is formed as a hollow pipe so that upper and lower portions thereof are opened, and a shear connection member 130a is formed inside the inner steel pipe 110a. The inner steel pipe 110a is connected and fixed to the outer steel pipe 120a by the steel pipe connecting member 140a.

The outer steel pipe 120a is spaced apart from the inner steel pipe 110a at a predetermined interval in the transverse direction and is formed so as to surround the outer circumferential surface of the inner steel pipe 110a.

Preferably, the distance between the outer steel pipe 120a and the inner steel pipe 110a is greater than the cross-sectional thickness of the pre-formed pile 200 so that the reinforcing pipe 100a stably supports the pre-formed pile 200 can do.

That is, the outer steel pipe 120 is formed on the same center axis as the inner steel pipe 110a, and the cross-sectional shape of the outer steel pipe 120 is formed to be concentric with the inner steel pipe 110a.

The outer steel pipe 110a is formed to be smaller in height than the inner steel pipe 110a and the reinforcing rib 150a may be radially formed between the outer steel pipe 120a and the upper spacing space of the inner steel pipe 110a.

However, it is of course possible that the outer steel pipe 120a and the inner steel pipe 110a are formed to have the same height so that the pre-formed pile 200 is supported by the outer steel pipe 120a and the inner steel pipe 110a.

The outer steel pipe 120a is also formed as a hollow pipe as in the inner steel pipe 110a, so that the upper and lower portions are opened. As described later, a filler material 500 such as cement paste is disposed in the inner space between the outer steel pipe and the inner steel pipe, and is formed of a closed pile instead of the open pile.

That is, after the filling material 500 is filled in the casing 400 at a predetermined height, the pre-pile 200 connected to the dual pipe end reinforcing portion 100a is inserted into the casing 400, and the double pipe end reinforcing portion 100a And the closed end is formed by the filling material 500.

The inner steel pipe 110a and the outer steel pipe 120a of the present invention are spaced apart from each other at predetermined intervals and are synthesized by the filler material 500 so as to stably support the starting pile while being formed as a hollow pipe having upper and lower openings, The bottom surface of the part is formed to penetrate the slice S and be directly supported on the bottom surface G of the excavation soil.

Accordingly, it is possible to solve the problem that the supporting force is weakened by the slime by preventing the slim from being present between the double pipe end reinforcement portion and the bottom surface G of the excavation soil, and the problem of additional settlement can be solved, So that a very secure end reinforcement file is formed.

In addition, according to the present invention, the filler 500 is filled in the inside of the double pipe end reinforcing portion and hardened, thereby forming a closed pile, thereby uniformly transferring the load of the existing pile to the ground.

In addition, since the double tube end reinforcing part is formed of the inner steel pipe and the outer steel pipe, the end reinforcing pile is formed by using the double pipe end reinforcing part which is very easy to expand and structurally stable.

The shear connectors 130a, 131a, 133a and 135a are formed on the inner side or the outer side of the inner steel pipe 110a so as to increase the bonding force between the filler 500 and the inner steel pipe 110a.

In other words, the shear connection member 131a may be formed of a plurality of steel rods and may be formed to be fixed to the inner circumferential surface of the inner steel pipe 110a by a method such as welding. The outer steel pipe 110a, Or may be formed to be bent and welded.

Referring to FIG. 3A, it is understood that the shear connection members 131a may be formed to have a length corresponding to the diameter of the inner steel pipe 110a or may be formed to be smaller than the diameter.

The other shear connecting member 133a may be formed to protrude outside the inner steel pipe 110a through the inner steel pipe 110a to a predetermined length.

Also, the other shear connector 135a may be formed to be radially arranged so as to partially protrude to the inside and outside of the inner steel pipe 110a.

Referring to FIG. 2B, it can be seen that the shear connectors 135a may be formed radially between the steel pipe connector 140a.

Accordingly, the present invention can solve the problem of sliding between the filler and the pile, such as cement paste, which is a problem of the prior art, by increasing the coupling force between the shear connector and the cement paste and easily forming the closed pile, To the ground.

The steel pipe connector 140a has a function of connecting the inner steel pipe 110a and the outer steel pipe 120a and a function of promoting the synthesis of the filler.

That is, the steel pipe connecting member 140a is radially formed on the upper and lower portions of the outer steel pipe 120a so as to correspond to the distance between the inner steel pipe 110a and the outer steel pipe 120a. The inner steel pipe 110a is easily welded, And the outer steel pipe 120a.

The steel pipe connecting member 140a may have a rectangular cross section or be formed in the form of a bolt, such as a stud bolt, so that the filling material 500 is not obstructed.

2A and 2B, the reinforcing rib 150a is radially fixed to the upper end of the outer steel pipe 120a and the upper surface of the inner steel pipe 110a.

The reinforcing rib 150a includes a radially formed vertical stiffener 151a and upper and lower horizontal stiffeners 155a and 153a formed at upper and lower portions of the vertical stiffener 151a.

The vertical stiffeners 151a are formed in a downwardly extending manner, and a plurality of the vertical stiffeners 151a are disposed radially along the outer peripheral surface of the inner steel pipe 110a.

The lower horizontal reinforcing plate 153a is formed of a plate material and is fixedly coupled to the upper portion of the steel pipe connecting member 140a and the upper end of the outer steel pipe 120a.

The upper horizontal stiffening plate 155a is formed so that the foundation pile 200 is tangential and fastened by a fastening unit not shown.

Although not shown, the reinforcing rib 150a is formed only of the lower horizontal reinforcing plate 153a and the vertical reinforcing member 151a without forming the upper horizontal reinforcing plate 155a, May be formed on the upper surface of the first substrate 140a. In this case, the reinforcing rib 150a can stably support the pre-formed pile 200 by a fastening member such as a bolt in contact with the lower side surface of the pre-formed pile 200.

Next, a description will be given of a structure in which the tip reinforcing pile is connected to a steel pile such as a steel pipe pile 300 as an established pile in a tip reinforcing pile manufactured using the double pipe end reinforcing portion of the present invention.

3C and 3D are a combined perspective view and a cross-sectional view of a steel pipe pile and an end reinforcement pile manufactured using the double pipe end reinforcement according to an embodiment of the present invention.

Referring to FIG. 3C, it can be seen that the tip reinforcement pile manufactured using the double pipe end reinforcement according to an embodiment of the present invention is connected to the steel pipe file 300 with the double pipe end reinforcement 100a.

The tip reinforcement file manufactured by using the double tube end reinforcement connected to the steel pipe file according to the embodiment of the present invention has the tip formed by using the double pipe end reinforcement connected to the PHC file according to one embodiment of the present invention. It is the same as the reinforcement file. Therefore, different configurations will be mainly described.

The double pipe end reinforcing portion 100a connected to the steel pipe file according to the embodiment of the present invention is constructed such that the inner pipe 110a is connected to the upper end of the double pipe end reinforcing portion connected to the PHC file according to the embodiment of the present invention, As shown in FIG. The inner steel pipe 110a and the steel pipe file 300 can be fixedly formed by welding or the like using the upper surface of the inner steel pipe projecting portion 111a.

It can be seen that the reinforcing members 150a (151a, 153a) are formed between the outer peripheral surface of the inner steel pipe projecting portion 111a and the upper surface of the outer steel pipe 120a.

It is, of course, possible to form the steel pipe bundle 300 so as to be fixedly connected to the upper portion of the steel pipe bundle 140a by making the height of the inner steel pipe 110a the same as that of the outer steel pipe 120a.

[End reinforcing pile fabricated by using the double pipe end reinforcing portion 100b (Example 2)] [

The second embodiment is a case where a pile such as a PHC file or a steel pipe file is connected to a dual pipe end reinforcing portion 100b and a conventional pile 200 or 300 in a front end reinforcing pile manufactured using the double pipe end reinforcing portion 100b can do.

4A and 4B are a sectional view and an exploded perspective view of a tip reinforcement pile fabricated using a double pipe end reinforcement according to a second embodiment of the present invention.

The end reinforcing pile fabricated using the double pipe end reinforcing portion according to Embodiment 2 of the present invention corresponds to the end reinforcing pile fabricated using the double pipe end reinforcing portion according to Embodiment 1 of the present invention in most of the configurations. Corresponding member numbers are assigned to corresponding configurations.

4A and 4B, the lower end of the constructed piles 200 and 300 and the upper end of the double pipe end reinforcing part 100b are connected and fixed, and the double pipe end reinforcing part 100b has a lower end connected to the bottom surface G of the excavation .

The double pipe end reinforcement portion 100b includes an inner steel pipe 110b, an outer steel pipe 120b, a shear connecting member 130b, a steel pipe connecting member 140b and a reinforcing rib 150b.

The inner steel pipe 110b is connected to the lower end of the foundation piles 200 and 300 by a coupling part (not shown), and is formed as a hollow pipe so that the upper and lower parts are opened. A shear connection member 130b is formed inside the inner steel pipe 110b and an inner steel pipe 110b and an outer steel pipe 120b are connected and fixed by the steel pipe connecting member 140b.

The inner steel pipe 110b is formed to have an inner diameter corresponding to the outer diameter of the pre-formed piles 200, However, it is of course possible that the inner diameter of the inner steel pipe 110b is formed to be larger or smaller than the outer diameter of the foundation piles 200, 300.

Referring to FIG. 4A, reinforcing ribs 150b may be continuously formed along the circumference of the inner steel pipe 110b, or may be formed at predetermined intervals along the circumference of the inner steel pipe 110b. The inner steel pipe 110b and the double pipe end reinforcing portion 100b are reinforced by the reinforcing ribs 150b so that the existing piles 200 and 300 can be stably supported on the double pipe end reinforcing portion 100b.

4B illustrates that the steel pipe bundle 300 is coupled to the double pipe end reinforcement portion 100b and that the reinforcing rib 150b is not formed. 110b, the reinforcing ribs 150b may be formed.

The outer steel pipe 120b is formed so as to surround the outer circumferential surface of the inner steel pipe 110b at a lower portion of the inner steel pipe 110b. Preferably, the distance between the outer steel pipe 120b and the inner steel pipe 110b is greater than the cross-sectional thickness of the pre-formed piles 200 and 300 so that the two-pipe reinforced portion 100b stably supports the pre-formed piles 200 and 300 .

The outer steel pipe 120b is also formed as a hollow pipe as in the inner steel pipe 110a, so that the upper and lower portions are opened. Accordingly, a filling material 500 such as cement paste is installed in the inner space between the outer steel pipe and the inner steel pipe, and is formed of a closed pile rather than a open-end pile.

The outer steel pipe 120b according to the second embodiment of the present invention is formed to have a lower height than the outer steel pipe 120a according to the first embodiment of the present invention. That is, the height of the outer steel pipe 120b is stably supported by the outer steel pipe 120b and the inner steel pipe 110b. When the inner pipe 120b penetrates the slime S, And may be formed to a height enough to accommodate the slim S between the outer steel pipe 120b and the inner steel pipe 110b.

Accordingly, it is possible to solve the problem that the supporting force is weakened by the slime by preventing the slim from being present between the double pipe end reinforcement portion and the bottom surface G of the excavation soil, and the problem of additional settlement can be solved, So that a very secure end reinforcement file is formed.

In addition, according to the present invention, the filler 500 is filled in the inside of the double pipe end reinforcing portion and hardened, thereby forming a closed pile, thereby uniformly transferring the load of the existing pile to the ground. In addition, since the double tube end reinforcing part is formed of the inner steel pipe and the outer steel pipe, the end reinforcing pile is formed by using the double pipe end reinforcing part which is very easy to expand and structurally stable.

In addition, since the longitudinal length of the outer steel pipe is formed to be smaller than that of the inner steel pipe, the double pipe end reinforcing portion is lightweight, so that the workability is improved.

 The shear connection member 130b is formed to be formed inside or outside of the inner steel pipe 110b so as to enhance the bonding force with the filling material 500 laid thereon.

The shear connection member 130b may be formed of a plurality of steel rods and may be formed to be fixed to the inner circumferential surface of the inner steel pipe 110b by a welding or fastening device or may be fixed to the outer circumferential surface of the inner steel pipe 110b through the inner steel pipe 110b, So as to be welded.

Meanwhile, although not shown, a shear connection member 130b may be formed between the inner steel pipe 110b and the outer steel pipe 120b to increase the coupling force between the inner steel pipe 110b and the outer steel pipe 120b.

Accordingly, the present invention can solve the problem of sliding between the filler and the pile, such as cement paste, which is a problem of the prior art, by increasing the coupling force between the shear connector and the cement paste and easily forming the closed pile, To the ground.

The steel pipe connector 140b has a function of connecting the inner steel pipe 110b and the outer steel pipe 120b and a function of promoting the synthesis of the filler.

The steel pipe connecting member 140b may be radially formed on the upper part of the outer steel pipe 120b to correspond to the distance between the inner steel pipe 110b and the outer steel pipe 120b, The steel pipe 120b can be fixed.

The steel pipe connection member 140b may be formed in a rectangular shape in cross section at a lower end and may be formed in the form of a bolt such as a stud bolt.

The reinforcing ribs 150b are formed to support the foundation piles 200 and 300 on the inner surface of the upper end of the inner steel pipe 110b.

The reinforcing ribs 150b may be radially spaced apart at predetermined intervals along the inner circumferential surface of the inner steel pipe 110b, but they may be integrally formed.

[Method of constructing a reinforcement pile fabricated using a double pipe end reinforcement (Example 1)]

FIG. 5 is a view showing a procedure of constructing a reinforcement pile fabricated using a double pipe end reinforcement 100a according to an embodiment of the present invention.

5, a ground is excavated by a drilling machine 600 to a design depth to a planned ground to form a drilling hole 700, and a casing (not shown) inserted into the drilling hole 700 at a predetermined interval 400 from the excavation apparatus 600.

In this case, the excavator 600 can be inserted into the casing 400 to excavate the ground, and the excavator 700 can be formed only by the excavator 600, and then the casing 400 can be inserted into the excavator hole 700 Of course it is possible.

The casing 400 may be formed so as to be in contact with the excavation hole 700 in order to maintain a vacancy wall of the excavation hole 700. Preferably, do.

In this case, a slim S can be formed at a predetermined height on the lower end of the casing 400 and the lower portion of the excavation hole 700.

Next, the filler 500 is filled into the casing 400, which is supported at the bottom of the excavation site bottom surface G and the slim S, at a preset height.

Next, the filler material 500 is inserted into the casing 400 filled with the planned height, and the tip reinforcement file to which the double pipe end reinforcing portion 100a and the formed piles 200, 300 are connected is inserted.

Accordingly, the non-hardened filler material 500 is lifted to a predetermined height inside the casing 400 according to the volume of the tip reinforcing pile.

Further, it can be seen that the casing 400 and the front end reinforcing piles are spaced apart from each other by a predetermined distance, and the front end reinforcing pile is formed on the slime S.

Next, the filler 500 is additionally installed in the casing 400 and the spaced apart portion of the casing 400 and the drill hole 700, and the casing 400 is pulled out from the drill hole 700.

Accordingly, the filler material 500 is filled up to the upper portion of the excavation hole 700.

Next, the upper end of the foundation piles 200 and 300 is struck with a hammer or the like not shown in the drilling apparatus 600.

The cylindrical pile 200 connected to the double pipe end reinforcing portion 100a is filled in the casing 400 with the filler 500 at a predetermined height and then inserted into the casing 400 so that the double pipe end reinforcing portion 100a And the closed end is formed by the filling material 500.

In addition, the inner steel pipe 110a and the outer steel pipe 120a of the present invention are spaced apart from each other at a predetermined interval to be able to stably support the starting pile, and the upper and lower portions of the inner steel pipe 110a and the outer steel pipe 120a are formed of hollow tubes, And is directly supported on the bottom surface G of the excavation soil.

Next, a filling material 500 such as cement paste is additionally injected into the lower end of the front end reinforcing pile by using the injection device 800 to the lower portion of the front end reinforcing pile, that is, the slime S, So that the lower portion of the front end reinforcing pile is tightened with one structure.

Accordingly, it is possible to solve the problem that the supporting force is weakened by the slime by preventing the slim from being present between the double pipe end reinforcement portion and the bottom surface G of the excavation soil, and the problem of additional settlement can be solved, So that a very secure end reinforcement file is formed.

In addition, according to the present invention, the cement paste is installed in the inside of the double tube end reinforcement portion, thereby forming a closed pile, thereby evenly transferring the load of the existing pile to the ground, and further improving the tip end supporting force.

In addition, since the double tube end reinforcing part is formed of the inner steel pipe and the outer steel pipe, the end extension is very easy, and structurally stable end reinforcing pile is formed.

[Method of constructing a reinforcement pile fabricated using a double pipe end reinforcement (Example 2)]

FIG. 6 is a view showing a procedure for constructing a reinforcement pile fabricated using the double pipe end reinforcement 100b according to another embodiment of the present invention.

The end reinforcement pile construction process using the double pipe end reinforcement 100b according to another embodiment of the present invention is performed by using the double pipe end reinforcement 100a according to an embodiment of the present invention, The order is the same. Therefore, detailed description is omitted.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100a, 100b: double tube end reinforcement part
110a, 110b: inner steel pipe
120a, 120b: outer steel pipe
130a, 130b: Shear connectors
140a, 140b: Steel pipe connector
150a, 150b: reinforcing rib
200, < / RTI > 300:
400: casing
500: Cement paste
600: Excavator
700: Excavation Balls
800: Injection device
G: Excavation site bottom S: Slime

Claims (5)

The end reinforcement pile fixedly supported at the distal end of a pile (200, 300) having a center opening and a front end opened,
The double pipe end reinforcing portion (100b) formed at the lower portion of the tip reinforcing pile
An inner steel pipe 110b coupled to a lower end of the pre-formed piles 200 and 300 and corresponding to an outer diameter of the pre-formed piles 200 and 300; And an outer steel pipe 120b spaced from the inner steel pipe 110b by a predetermined distance and formed to be smaller than the length of the inner steel pipe 110b so as to surround an outer circumferential surface of the lower portion of the inner steel pipe 110b, ,
The double pipe end reinforcing portion 100b is directly supported on the bottom surface G of the excavation ground by passing through a slime S remaining on the bottom surface G of the excavation ground by opening the bottom surface, And a tip end reinforcement pile fabricated using the double pipe end reinforcement portion formed to correspond to the height of the slim (S). The method according to claim 1,
A front end joint 130b radially formed inside or outside the inner steel pipe 110b;
And a reinforcing rib 150b radially fixed to the upper end of the inner steel pipe 110b to connect the inner steel pipe 110b and the outer steel pipe 120b to each other, The end reinforcement file produced by using. 3. The method according to claim 1 or 2,
The conventional piles 200 and 300 connected to the double pipe end reinforcement are filled with a filler material 500 at a preset height in the casing 400 and then inserted into the casing 400,
The double pipe end reinforcing portion 100b is formed by using a double pipe end reinforcing portion forming a closed end by the filler 500. [ (a) pulling out the excavating apparatus 600 from the casing 400 inserted at a predetermined interval with the excavation hole 700;
(b) filling the filler material (500) with a predetermined height into the casing (400) where the lower end is supported by the bottom surface (G) of the excavating soil;
(c) inserting a tip reinforcement pile fabricated using the double pipe end reinforcement 100b and the constructed piles 200, 300 into the casing 400 filled with the filler material 500;
(d) further placing a filler (500) in the casing (400) and between the casing (400) and the excavation hole (700) and pulling out the casing (400); And
(e) The upper end of the tip reinforcing pile fabricated using the double pipe end reinforcing portion 100b is tapped so that the double pipe end reinforcing portion 100b passes through the slime S and is pushed to the bottom surface G And further injecting the filler material (500) to the portion where the slime (S) is formed, using the injection device (800). 5. The method of claim 4,
In the step (b), the double pipe end reinforcing part 100b is formed by using the double pipe end reinforcing part forming the closed end by the filler 500. [

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