KR20160102818A - Separable steel pipe pile for small horizontal displacement - Google Patents

Abstract

Disclosed is a separable steel pipe pile for reducing horizontal displacement. According to the present invention, the separable steep pipe pile for reducing horizontal displacement includes: a short pile supporting a load of a structure by being driven into the ground in a vertical direction; and a circular steel pipe having larger inner diameter than the outer diameter of the short pile and driven into the ground in the vertical direction, wherein the inner surface encloses the outer surface of the short pile. The circular steel pipe is formed to be assembled by being separated in the vertical direction, and a horizontal force applied to the short pile is transmitted to the circular steel pipe after the horizontal force is dissipated to a compressive force on the ground between the short pile and the circular steel pipe. According to the present invention, the separable steel pipe pile improves a horizontal support force and an inner structural force and, therefore, improves usability and safety allowance by reducing the horizontal displacement. The separable steel pipe pile for reducing horizontal displacement induces ductile fracture even if the horizontal force of a design load or greater is applied.

Description

[0001] SEPARABLE STEEL PIPE PILE FOR SMALL HORIZONTAL DISPLACEMENT [0002]

The present invention relates to a round steel pipe and a steel pipe pile, and more particularly, to a round steel pipe and a steel pipe pile which are held in a ground to support structures constructed on various grounds or the like.

A pile is a pillar that is pushed into the ground. A pile with the upper half exposed to the ground connects the structure to the pile. The pile is usually connected to a structure such as a bridge or a pier bridge of a pier in the water. It is also used as a part.

The foundation pile, which is completely embedded in the ground, belongs to a type of foundation used when a shallow foundation is not suitable. It is intended to increase the strength of the foundation foundation by putting the pile on a deep ground and to withstand the heavy load placed thereon. If the piles are classified according to the material, there are wooden piles, concrete piles, reinforced concrete piles, prestressed concrete piles, and steel piles.

Depending on the nature of the pile, it is divided into a support pile and a friction pile. The support pile means that the tip of the pile is supported by reaching to the hard ground. The friction pile supports the load by the surrounding ground, pile and friction force. It can not reach to the hard ground because the fragile layer continues deeply. When used. There are Frankie piles and pedestal piles to increase the bearing capacity of the tip. In addition, there are synthetic piles using simplex piles, raymond piles, compressors piles, and two or more piles of different materials.

In this connection, Korean Patent Laid-Open Publication No. 2010-0076399 discloses a steel pipe pile reinforced with a tip portion, and Patent Document No. 2010-0076399 discloses a structure in which a center portion is drilled and a tip end portion thereof is inserted into a ground; An outer tube formed to have an inner diameter larger than an inner diameter of a front end portion of the main pipe so as to surround the outer peripheral surface of the front end portion; And a reinforcing member installed at an interval formed between the distal end of the main pipe and the outer pipe and mediating between the main pipe and the outer pipe.

Open Patent Publication No. 2010-0076399 improves the frictional force as well as the bearing capacity by increasing the effective cross-sectional area of the tip of the steel pipe pile. The effect of clogging is enhanced by the intrusion soil introduced when the steel pipe pile is buried, thereby improving the bearing capacity of the steel pipe pile.

However, in the conventional steel pipe pile including the patent publication No. 2010-0076399, since the main pipe and the outer pipe are connected to each other through the stiffener, when the horizontal force acts on the steel pipe pile, the horizontal force acting on the end portion is transmitted to the main pipe and the outer pipe The joint portion of the reinforcing material, that is, the reinforcing material is concentrated at the welded portion, and the joint structure of the main pipe, the outer pipe and the reinforcing material is rapidly weakened.

In addition, the lateral force concentrated on the welded portion of the reinforcement induces cracks in the main pipe and the outer pipe, and when cracks are formed, brittle fracture of the main pipe is liable to occur even at a horizontal force smaller than the design load, There was a problem that it acted as a factor for inhibiting.

(0001) Korean Patent Publication No. 10-2010-0076399 (published on Jul. 2010)

An object of the present invention is to provide a horizontal displacement reducing type separating steel pipe which is improved in safety margin and usability by increasing a horizontal supporting force and an internal structure force, And to provide a separate circular steel pipe with reduced horizontal displacement that is easy to maintain.

The above object is achieved according to the present invention by providing a pile comprising: a pile supporting a load of a structure embedded in a longitudinal direction in a ground; And a circular steel pipe having an inner diameter larger than the outer diameter of the end pile and an inner surface surrounding the outer surface of the end pile and being stuck in a longitudinal direction on the ground, And the horizontal force acting on the single pile is dissipated by the compressive force of the ground between the single pile and the circular steel pipe, and then transmitted to the circular steel pipe.

Wherein the circular steel pipe has a semicircular cross-sectional shape and has a first left joint portion and a first right joint portion at an end thereof, respectively; And a second semicircular steel pipe having a semicircular cross-sectional shape and having a second left joint portion engaged with the first left joint portion at an end thereof and a second right joint portion engaged with the first right joint portion, .

The first semi-circular steel pipe and the second semi-circular steel pipe may have a constant section along the longitudinal direction.

A plurality of side plates may be formed on the outer surface of the circular steel pipe so as to protrude in a radial direction of the circular steel pipe so as to increase the amount of compression of the ground and the side plates may be formed to protrude further toward the ground.

A plurality of side panels may be formed on the outer surface of the end pile so as to protrude toward the inner surface of the circular steel pipe so as to increase the compression amount of the ground between the end pile and the circular steel pipe.

The plurality of side panels may be inclined with respect to the circumferential direction of the end pile so that the ground is raised between the end pile and the round steel pipe when the end pile is subjected to a horizontal force.

The end pile and the round steel pipe may be connected to each other by a plurality of shape memory alloy wires along the circumferential direction so that the gap between the end pile and the round steel pipe is recovered after the horizontal force acts on the end pile.

The above object is also achieved by a circular steel pipe having an inner diameter larger than the outer diameter of the end pile and extending in the longitudinal direction in the longitudinal direction so as to surround a part of the end pile supporting the load of the structure embedded in the longitudinal direction, So as to be assembled into the steel pipe.

According to the present invention, since the horizontal force acting on the single pile is dissipated by the compressive force of the ground between the single pile and the circular steel pipe, and then transmitted to the circular steel pipe, the lateral support force and the internal structural force are increased, It is possible to provide a horizontal displacement reducing type separable steel pipe pile which is improved in margin and usability and in which ductile fracture is induced even if a horizontal force greater than design load is applied.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a horizontal displacement-reducing separable steel pipe pile according to an embodiment of the present invention; FIG.
FIG. 2 is a perspective view showing a state in which a circular steel pipe is assembled in the horizontal displacement reducing type separable steel pipe pile shown in FIG. 1. FIG.
Fig. 3 is a view showing the state of use of the horizontal displacement-reducing separable steel pipe pile of Fig. 1; Fig.
4 is a perspective view of a horizontal displacement reducing type separable steel pipe pile according to another embodiment of the present invention.
5 is a perspective view of a horizontal displacement-reducing separable steel pipe pile according to another embodiment of the present invention.
6 is a view showing the state of use of the horizontal displacement reducing type separable steel pipe pile of Fig. 5;
7 is a perspective view of a horizontal displacement reducing type separable steel pipe pile according to another embodiment of the present invention.
8 is a view showing the state of use of the horizontal displacement reducing type separable steel pipe pile of Fig. 7;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

The horizontal displacement reducing type steel pipe pile (1) according to the present invention increases the horizontal and internal structural forces, thereby reducing the horizontal displacement, thereby improving the safety margin and usability. Even if horizontal forces above design load are applied, .

Further, in the horizontal displacement reducing type steel pipe pile 1 according to the present invention, the round steel pipe 20 can be used to reinforce a pre-installed pile (for example, an end pile 10).

FIG. 1 is a perspective view of a horizontal displacement reducing type steel pipe pile 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a circular steel pipe 20 assembled in the horizontal displacement- FIG. 3 is a view showing the state of use of the horizontal displacement reducing type separable steel pipe pile 1 of FIG. 1, and FIG. 4 is a perspective view showing the horizontal displacement reducing type separable steel pipe pile 1 according to another embodiment of the present invention. 5 is a perspective view of a horizontal displacement reducing type steel pipe pile 1 according to another embodiment of the present invention, and FIG. 6 is a perspective view showing a state of use of the horizontal displacement reducing type steel pipe pile 1 of FIG. Fig. 7 is a perspective view of a horizontal displacement reducing type steel pipe pile 1 according to another embodiment of the present invention, and Fig. 8 is a view showing the use state of the horizontal displacement reducing type steel pipe pile 1 of Fig. 7 .

1 and 3, the horizontal displacement-reducing type steel pipe pile 1 according to an embodiment of the present invention is constructed to support a structure (not shown) embedded in a ground G and built on a soft ground or the like And comprises a pile (10) and a round steel pipe (20).

As shown in FIGS. 1 and 3, the end pile 10 is configured to support the load of the structure embedded in the soil G in the longitudinal direction, and is formed of a cylindrical steel pipe. The pile 10 is vertically buried in the ground G in the form that the upper end is exposed from the ground.

Although not shown in detail, the upper end exposed to the ground of the end pile 10 is coupled with a structure (not shown), and the end pile 10 transfers the load of the structure and an external force applied to the structure to the ground G The structure is supported.

The diameter of the pile (10) is selected in consideration of the structure of the building, the load, the stiffness and the pile bearing capacity. The manufacturing technique and the installation technique of the single pile 10 are well known technologies and will not be described in detail.

As shown in FIGS. 1 and 3, the circular steel pipe 20 is provided to disperse a horizontal force acting on the end pile 10 on the ground G, And is stuck in the longitudinal direction on the ground G in a surrounding form.

More specifically, the round steel pipe 20 has an inner diameter larger than the outer diameter of the end pile 10 and surrounds the end pile 10 in such a manner that the inner surface thereof faces the outer diameter of the end pile 10, The ground G, cement, or construction filler is filled between the pile 10 and the round steel pipe 20 in a state where the pile 10 and the round steel pipe 20 are installed.

In the horizontal displacement reducing type steel pipe pile 1 according to the present invention, the circular steel pipe 20 is constructed so that it can be assembled separately in the vertical direction. Specifically, the first semicircular steel pipe 20a and the second semicircular steel pipe 20b ) (See Figure 2). ≪ RTI ID = 0.0 >

Since the circular steel pipe 20 is divided into the first and second semicircular steel pipes 20a and 20b, the second semicircular steel pipe 20b can be formed after the first semicircular steel pipe 20a is formed. And the round steel pipe 20 are coupled to each other so as to surround the end pile 10, the end pile 10 does not necessarily have to be joined to the center of the round steel pipe 20, do.

The structure of the round steel pipe 20 can be more suitably applied to reinforce the single pile 10. [

The first semicircular steel pipe 20a has a semicircular cross-sectional shape, and the first left joint portion 30 and the first right joint portion 40 are integrally formed at the ends thereof.

The second semicircular steel pipe 20b has a semicircular cross section and is engaged with the second left joint portion 50 and the first right joint portion 40 which are engaged with the first left joint portion 30 at the ends thereof, And the second joining portions 60 are integrally formed.

The first semi-circular pipe 20a and the second semi-circular pipe 20b preferably have a constant cross-section along the longitudinal direction. The first semi-circular pipe 20a and the second semi- The left joint portion 50 and the second right-side joint portion 60 are also made to have a constant cross-section along the longitudinal direction (vertical direction).

Thus, the first and second semicircular tubes 20a and 20b have a uniform cross-section along the longitudinal direction, so that when inserted in a direction perpendicular to the sheet surface, the resistance to the sheet surface is minimized, The separation between the two is prevented.

The first semi-circular pipe 20a and the second semi-circular pipe 20b may have the same shape (the first left joint portion 30 and the second right joint portion 60 are the same, (40) and the second left joint portion (50) are equal to each other). Thus, the productivity of the round steel pipe can be improved and the manufacturing cost can be reduced.

The first left joint portion 30 and the second left joint portion 50 are engaged with each other and are slidably coupled to each other along the vertical direction (vertical direction), but are prevented from being separated from each other in the vertical direction.

2, the first left coupling portion 30 includes a first projection 31 and a first groove 32, and the second left coupling portion 50 includes a second projection 31, (51) and a second groove (52).

The second protrusion 51 is inserted into the first groove 32 and the first protrusion 31 is inserted into the second groove 52 so that the first protrusion 31 is inserted into the first groove 32, The second left coupling portions 50 are coupled to each other to firmly couple the first and second left coupling portions 50 to each other, as well as to prevent rotation (rotation about the longitudinal axis) at the coupling point to prevent play or breakage due to external force .

The combination of the first right-side mating portion 40 and the second right-side mating portion 60 may be the same as that of the first left coupling portion 30 and the second left coupling portion 50, The joining portion 40 may include a third projection 41 and a third groove 42 and the second right side joint portion 60 may include a fourth projection 61 and a fourth groove 62.

Generally, when horizontal force (shear force), vertical force (axial load) and moment are applied to the head of a pile, the moment and shear force show a large value near the surface of the pile, but tend to converge with decreasing depth along the pile, Especially, in case of the structure in which the shear force and the moment are largely applied, the steel pipe pile having high resistance against the shear force and the moment is mainly used.

Conventionally, when the pile is used as the basis of the dominant structure of horizontal force, it is necessary to form a large cross-sectional area of the pile due to excessive lateral force and moment generated near the ground surface, which causes a disadvantage that excessive material cost and construction cost are required.

In order to solve such a problem, Japanese Unexamined Patent Publication (Kokai) No. 2010-0076399 discloses a steel pipe pile having a main pipe and an outer pipe joined together through a stiffener to act as a single body, but the horizontal force acting on the end portion is a combination of a main pipe and an outer pipe The joint structure of the main pipe, the outer pipe, and the reinforcement material is rapidly weakened because the reinforcement material has to be concentrated at the welded portion.

In addition, the lateral force concentrated on the welded portion of the reinforcement induces cracks in the main pipe and the outer pipe, and when cracks are formed, brittle fracture of the main pipe is liable to occur even at a horizontal force smaller than the design load, There was a problem that it acted as a factor for inhibiting.

1 and 3, the horizontal displacement reducing type steel pipe pile 1 of the present invention is formed such that the end pile 10 and the round steel pipe 20 do not move integrally when the horizontal force acts, The above-described problems are fundamentally solved.

1 and 3, the pile 10 and the circular steel pipe 20 are installed on the ground G in an independent form, and the circular steel pipe 20 has a horizontal force So that the pile 10 is surrounded by the ground G as shown in FIG.

As described above, the ground G, cement, construction filler or the like is filled between the end pile 10 and the round steel pipe 20 in the state of being installed on the ground G, The horizontal force acting on the end pile 10 is first dispersed by the compressive force of the ground G filled in between the end pile 10 and the round steel pipe 20, cement or construction filler. It is assumed that the ground G is filled between the single pile 10 and the round steel pipe 20 in the following description.

More specifically, as shown in FIG. 3 (b), when the upper end of the single pile 10 is tilted to one side due to the horizontal force, the single pile 10 and the round steel pipe 20 are separated from each other, The space between the end pile 10 and the circular steel pipe 20 is reduced in the direction in which the end pile 10 is tilted and at the same time the space between the end pile 10 and the circular steel pipe 20 is filled The ground G is compressed and a part of the horizontal force is primarily dispersed by compressing the ground G so as to compress the ground G primarily.

The horizontal force acting on the end pile 10 is obtained by compressing the ground G charged between the pile 10 and the round steel pipe 20 while simultaneously compressing the ground G compressed on the side where the ground G is compressed To the inner surface of the round steel pipe (20).

3 (b), the horizontal force transmitted to the circular steel pipe 20 forms a wide contact surface with the ground G through the outer surface of the circular steel pipe 20 having a larger diameter than the outer surface of the end pile 10 And is secondarily dispersed as a compressive force of the outer ground G of the circular steel pipe 20. [

That is, as shown in Patent Publication No. 2010-0076399, the main pipe and the outer pipe are joined together through a stiffener, and the steel pipe pile acting as an integral part is directly transmitted to the outer pipe of the main pipe so that the horizontal force compresses the outer pipe of the outer pipe But the lateral displacement reducing type steel pipe pile 1 of the present invention is such that the horizontal force acting on the end pile 10 is primarily dissipated while compressing the ground G filled between the round steel pipes 20 The amount of energy dissipated by the horizontal force applied to the end pile 10 is greatly increased compared to the conventional steel pipe pile due to the secondary dissipation while compressing the outer ground G of the circular steel pipe 20 so that the tilting of the structure and the steel pipe pile 1 There is an advantage that it is prevented more effectively.

4, the horizontal displacement reducing type steel pipe pile 1 according to another embodiment of the present invention is formed such that a plurality of side plates 21 protrude radially from the outer surface of the circular steel pipe 20 .

When a plurality of side plates 21 are formed on the outer surface of the round steel pipe 20, the following advantages are obtained.

First, as the contact area between the circular steel pipe 20 and the ground G increases, the secondary energy dissipation due to the compressive force of the outer ground G of the circular steel pipe 20 increases.

Second, it is possible to adjust the time point at which the secondary dissipation due to the compression of the outer ground G is started after the primary dissipation by the compression of the ground G between the pile 10 and the circular steel pipe 20.

As described above, the horizontal displacement-reducing type steel pipe pile 1 of the present invention has the advantage that the horizontal force acting on the end pile 10 compresses the ground G filled between the round steel pipes 20, And the secondary ground G of the circular steel pipe 20 is compressed.

At this time, the compressive force of the ground G between the pile 10 and the circular steel pipe 20 is transmitted to the circular steel pipe 20 at the same time as compression starts. However, when the circular steel pipe 20 compresses the outer ground G Since a horizontal force of a predetermined strength or more is transmitted to the circular steel pipe 20 through the compressed ground G, a certain time difference is generated between the first dissipation and the second dissipation.

Therefore, when a plurality of side plates 21 are formed on the outer surface of the circular steel pipe 20, the contact area between the circular steel pipe 20 and the ground G is increased, The displacement reducing effect of the structure can be improved.

As shown in FIG. 4, it is preferable that the side plate 21 is formed to be more protruded toward the upper side, that is, toward the ground.

As described above, when horizontal force (shear force), vertical force (axial load) and moment are applied to the head of the pile, moment and shear force are large near the surface of the pile. However, as the depth deepens along the pile, .

Therefore, if the side plate 21 is formed so as to protrude in the radial direction from the ground G to the ground, the contact area between the circular steel pipe 20 and the ground G increases in proportion to the horizontal force, And the area of contact with the ground G becomes smaller toward the lower side, so that the circular steel pipe 20 can be easily hammered.

5, the horizontal displacement-reducing type steel pipe pile 1 according to another embodiment of the present invention has a structure in which the end pile 10 and the circular steel pipe 20 are connected to each other via a plurality of shape memory alloy wires W, Lt; / RTI > The plurality of shape memory alloys may be formed at regular intervals along the circumferential direction of the end piles (10) and the circular steel pipe (20).

The shape memory alloy wire W is fixedly coupled (by welding or the like) in the circular steel pipe 20 and may be fixedly connected to the pile 10. However, the shape memory alloy wire W is not necessarily limited to the pile 10 As shown in Fig.

As described above, if the pile 10 is tilted by the horizontal force, the pile 10 remains permanently tilted and the primary energy dissipation for the horizontal force in the same direction decreases, even if the lateral force is removed. Therefore, when the horizontal force is applied again to the pile 10 in the same direction, the total amount of energy dissipation decreases.

6 (b), if the pile 10 and the circular steel pipe 20 are connected by a plurality of shape memory alloy wires W, even if the pile 10 is inclined, The space between the single pile 10 and the circular steel pipe 20 is restored to its original state by the restoring force of the shape memory alloy as shown in Fig. 1) is minimized.

The shape memory alloy wire W is preferably formed of a super-elastic shape memory alloy. A superelastic shape memory alloy (superelasticity shape memory alloy) is a metal that has the property of restoring to its original shape at room temperature even after the plastic deformation is applied, even though heat is not applied. Therefore, the shape memory alloy wire W is restored to its original state even if heat is not applied after tensile deformation by the horizontal force.

5, a plurality of shape memory alloy wires W are connected to a first shape memory alloy wire W1 and an end pile 10 connecting the upper ends of the end piles 10 and the circular steel pipes 20, respectively, And a second shape memory alloy wire W2 connecting the lower ends of the circular steel tubes 20 to each other.

The first shape memory alloy wire W1 connects the upper end of each of the end pile 10 and the circular steel pipe 20 and the second shape memory alloy wire W2 connects the end pile 10 and the circular steel pipe 20, The distance between the end pile 10 and the round steel pipe 20 is restored to the original state over the entire length of the round steel pipe 20 even if the end pile 10 is inclined.

7 (a), the horizontal displacement-reducing type steel pipe pile 1 according to another embodiment of the present invention is characterized in that a plurality of side panels 11 are formed on the outer surface of the end pile 10, (Not shown).

When the plurality of side panels 11 are formed so as to protrude from the outer surface of the end pile 10, the contact area between the end pile 10 and the ground G increases from the inside of the round steel pipe 20, There is an advantage that the amount of compression of the ground G between the pile 10 and the circular steel pipe 20 increases and the amount of primary energy dissipation to the horizontal force increases.

As shown in FIG. 7 (a), each of the plurality of side panels 11 is preferably formed to be inclined with respect to the circumferential direction of the end pile 10, and further, the side panel 11 may have a spiral shape.

8 (a), when a plurality of side panels 11 are formed to be inclined from the circumferential direction of the end pile 10, as shown in Fig. 8 (b), the pile 10 The ground G is lifted between the end pile 10 and the circular steel pipe 20 along the inclination of the side panel 11. [

As shown in FIG. 8 (b), when the ground G rises along the slope of the side panel 11 at the side where the end pile 10 is tilted, the following advantages are obtained.

First, since the ground G moves along the side panel 11 and moves to the opposite side, the advantage that the cavitation between the single pile 10 and the round steel pipe 20 is minimized on the side opposite to the tilting of the single pile 10 .

Secondly, the pile 10 is inclined and goes up to the ground G under the circular steel pipe 20 to the space between the end pile 10 and the round steel pipe 20 along the side panel 11, Since the upper part of the ground 1 is closed without a space for the ground G to move by the structure built on the ground, the density of the ground G between the end pile 10 and the circular steel pipe 20 becomes higher, There is an advantage that the amount of secondary dissipation energy is increased.

Accordingly, the horizontal displacement reducing type steel pipe pile 1 according to another embodiment of the present invention has an effect of increasing the total supporting force, increasing the internal structure force, reducing the horizontal displacement, and improving the safety margin ratio have.

7 (b), the ground G, the cement or the construction filler passes through the plurality of side panels 11 from the ground to easily fill the gap between the pile 10 and the round steel pipe 20 Each of the plurality of side panels 11 may be inclined with respect to the circumferential direction of the end pile 10 and may be formed discontinuously. The ground G, the cement or the construction filler easily flows into the lower end portion of the circular steel pipe 20 through the gap between the side panels 11 formed discontinuously and slidably charged along the side panel 11 And is completely filled without forming a cavity between the pile 10 and the circular steel pipe 20.

The lateral force acting on the end pile 10 is dissipated by the compressive force of the ground G between the end pile 10 and the circular steel pipe 20 and then transmitted to the circular steel pipe 20, The present invention can provide a horizontal displacement reducing type separate steel pipe pile 1 in which the internal structure force is increased, the horizontal displacement is reduced to improve the safety margin and usability, and the ductile fracture is induced even when the horizontal force is greater than the design load do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have. Accordingly, it should be understood that such modifications or alterations should not be understood individually from the technical spirit and viewpoint of the present invention, and that modified embodiments fall within the scope of the claims of the present invention.

1: Steel pipe pile 10: Stag pile
20: round steel pipe 11: side panel
21: side plate W: shape memory alloy wire
G: Ground

Claims (10)

A single pile supporting the load of the structure embedded in the longitudinal direction in the ground; And
A circular steel pipe having an inner diameter larger than an outer diameter of the end pile and an inner surface surrounding the outer surface of the end pile and being stuck in a longitudinal direction on the ground,
Wherein the circular steel pipe is divided and assembled in a longitudinal direction,
Wherein the horizontal force acting on the single pile is dissipated by the compressive force of the ground between the single pile and the circular steel pipe and then transmitted to the circular steel pipe. The method according to claim 1,
Wherein the circular steel pipe comprises:
A first semicircular steel pipe having a semicircular cross section and formed with a first left joint portion and a first right joint portion at an end thereof; And
A second semi-circular steel pipe having a semicircular cross-sectional shape and having a second left joint portion engaged with the first left joint portion at an end thereof and a second right joint portion engaged with the first right joint portion, Wherein the horizontal displacement reducing type separable steel pipe pile is characterized in that the steel pipe pile is horizontally displaced. 3. The method of claim 2,
Wherein the first semi-circular steel pipe and the second semi-circular steel pipe have a constant section along the longitudinal direction. 4. The method according to any one of claims 1 to 3,
A plurality of side plates are formed on the outer surface of the circular steel pipe so as to project in the radial direction of the circular steel pipe so as to increase the compression amount of the ground,
Wherein the side plate is formed to protrude further toward the ground. 4. The method according to any one of claims 1 to 3,
Wherein a plurality of side panels are formed on the outer surface of the end pile so as to protrude toward the inner surface of the circular steel pipe so that a compression amount of the ground between the end pile and the circular steel pipe increases. 6. The method of claim 5,
Wherein each of the plurality of side panels is inclined with respect to a circumferential direction of the end pile so that the ground is raised between the end pile and the round steel pipe when the end pile is subjected to a horizontal force. The method according to claim 1,
Wherein the stepped pile and the circular steel pipe are connected to each other by a plurality of shape memory alloy wires along the circumferential direction so that the interval between the stepped pile and the circular steel pipe is recovered after the horizontal force acts on the stepped pile. . A circular steel pipe having an inner diameter larger than the outer diameter of the end pile and extending in the longitudinal direction on the ground so as to surround a part of the end pile supporting the load of the structure embedded in the longitudinal direction,
And the vertical displacement reducing type separating type circular steel pipe is assembled separately in the vertical direction. 9. The method of claim 8,
Wherein the circular steel pipe comprises:
A first semicircular steel pipe having a semicircular cross section and formed with a first left joint portion and a first right joint portion at an end thereof; And
A second semi-circular steel pipe having a semicircular cross-sectional shape and having a second left joint portion engaged with the first left joint portion at an end thereof and a second right joint portion engaged with the first right joint portion, Wherein the horizontal displacement reducing type separating type circular steel pipe is characterized in that the horizontal displacement reducing type separating type circular steel pipe. 10. The method according to claim 8 or 9,
A plurality of side plates are formed on the outer surface of the circular steel pipe so as to project in the radial direction of the circular steel pipe so as to increase the compression amount of the ground,
Wherein the side plate is formed to protrude further toward the ground.

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