KR101135384B1 - Earth retaining structure having ring beam - Google Patents

Abstract

PURPOSE: An earth retaining structure having a ring beam is provided to minimize installation and construction time using a minimum amount of beams and post piles. CONSTITUTION: An earth retaining structure having a ring beam comprises a ring beam(200), center beams, inclined beams(320), post piles(100), and load dispersing/supporting units. The center beams are coupled along the edge of the ring beam. One end of each inclined beam is coupled to the center beam units, and the other end is coupled to the ring beam. The post piles are vertically coupled to the ring beam, and the bottom ends of the post piles are buried in the ground. The load dispersing/supporting units are formed around the ring beam.

Description

Earth retaining structure having ring beam

The present invention relates to a retaining structure having a ring brace, and more particularly to the technical field of the retaining structure for effectively responding to the earth pressure in underground construction.

In order to build a building underground, a trench construction is necessary. In particular, underground excavation works in urban areas have to be considered for the stability of adjacent buildings, so various studies have been carried out on the structure of the clogs.

The most common methods for forming the retaining structure only in the space within the construction site are the Raker support method and the Strut support method. Raker support has the advantage of being able to support the space within the construction site with minimal support. However, the excavation depth is greatly limited, and it is difficult to apply more than a certain depth.

On the other hand, the prop support method is a method of holding the earth pressure acting by the retaining wall and the prop structure. The braces are typically arranged closely at intervals of several meters in the horizontal and longitudinal directions.

Figure 1 shows the earth block structure by this conventional brace support method.

Referring to FIG. 1, a digging work is performed in the basement, and the wall 10 is installed on both sides, and the post pile 30 is vertically installed at a predetermined interval therebetween.

Between the post piles 30, a brace 20 is provided in a plurality of horizontally formed a plurality of layers.

Since the weight of the plurality of braces 12 is considerably heavy, the phenomenon of vertical downward deflection is likely to occur. Therefore, the buckling of the brace 20 can be prevented only when the post pile 30 is very closely arranged.

Due to the large number of braces and post piles, the working space in the excavation space becomes very narrow and the work efficiency is greatly reduced.

In addition, since a large amount of props and post piles are installed, there is a disadvantage in that construction cost and construction period are greatly increased.

In addition, the movement of construction equipment for the excavation work and material loading work are very inefficient due to the narrow space.

The present invention is devised to improve the disadvantage of the conventional brace support method.

It is a first object of the present invention to provide an earth block structure capable of sufficiently securing a working space with minimal support.

It is a second object of the present invention to propose a masonry structure that can minimize the masonry structure installation time and construction period.

It is a third object of the present invention to propose an earthquake structure exhibiting sufficient structural stability even with the use of a small number of props.

A fourth object of the present invention is to propose an earth block structure that can effectively cope with a large earth pressure at a deep depth.

Solution to achieve the above object is as follows.

Ring brace means (200) formed in the shape of a portion of a circle or ellipse; and

A center brace means 310 coupled along the circumference of the ring brace means 200, coupled in a direction away from the center of the ring brace means 200 (the center of the circle or ellipse) (radial direction); and

One end is coupled to the center brace means 310, the other end is inclined brace means 320, 330 coupled to the ring brace means (200); and

A post pile 100 which is vertically coupled to the ring brace means 310, the lower end of which is buried underground; An earthquake unit structure comprising a is provided.

The earth block unit structure may further include a load distribution support means 500, one side of the load distribution support means 500 is coupled to the distal end of the central brace means 310 or the inclined brace means 320, 330, The other side of the load distribution supporting means 500 is characterized in that coupled to the circumferential portion of the ring brace means 200.

The inclined brace means 320 and 330 are formed to be symmetrical with respect to the center brace means 310.

By interconnecting the earthquake unit structure, the entire earthquake structure can be achieved.

That is, the ring brace means 200 formed in the shape of a circle or ellipse; and

A plurality of central brace means (310) coupled along the circumference of the ring brace means (200) and coupled to the ring brace means (200) in a radial symmetry form; and

One end is coupled to the central brace means 310, the other end is a plurality of inclined brace means 320, 330 coupled to the ring brace means (200); and

A plurality of post piles (100) formed along the circumference of the ring brace means (310), the lower ends of which are buried underground, while being vertically coupled to the ring brace means (310); . ≪ / RTI >

Meanwhile, a ring brace means 202 having an inner diameter smaller than that of the ring brace means 200 is further provided inside the ring brace means 220, wherein the two ring brace means 200 and 202 are concentric circles. To achieve this, it is possible to form the earth block structure to be coupled to each other by a predetermined ring connecting means (800).

Other detailed configurations and functions of the invention will be described in detail.

In the present invention, a simple structure of the earth retaining structure that can resist the earth pressure even with a simple structure.

Since a small number of props and post piles are used, there is an advantage that the construction cost and construction period are significantly reduced.

In addition, it is possible to secure sufficient space for moving heavy equipment and materials in its own site at the excavation site.

In addition, it is possible to prevent various accidents in the construction site, such as to prevent the settlement of the ground by the light weight of the earthen structure there is an advantage that can be prevented in advance.

It also has the advantage of being able to withstand earth pressure very effectively, even when working with deep trenches.

1 is a cross-sectional view of a conventional earthenware structure installed in the excavated space, showing a post pile 30 and the brace 20.
Figure 2 is a plan view of the retaining structure according to a preferred embodiment of the present invention, it is shown briefly in a straight line only.
FIG. 3 is an enlarged view of a portion A1 of FIG. 2.
FIG. 4 is a view of the structure of FIG. 3 viewed in the C direction. FIG.
FIG. 5 is a view of the structure of FIG. 4 viewed in the D direction. FIG.
FIG. 6 is a diagram illustrating components of the structure of FIG. 5.
7 is a view illustrating a state in which the structure of FIG. 4 is connected to the earth wall 700 by the structure B. Referring to FIG.
FIG. 8A is an earth block structure having the same structure as that of FIG. 2, to perform structural strength simulation. FIG.
FIG. 8B is a simulation clod structure for comparison with the results shown in FIG. 8A.
9A and 9B show the bending moments of the retaining structure of FIGS. 8A and 8B, respectively.
10A and 10B show the axial force applied to the retaining structure of FIGS. 8A and 8B, respectively.
11A and 11B show the shear force applied to the retaining structure of FIGS. 8A and 8B, respectively.
12A and 12B illustrate displacements generated in the retaining structure of FIGS. 8A and 8B, respectively.
FIG. 13 shows a state in which the wire brace means 400, 401, 402, 403 are coupled to the ring brace means 200 as another embodiment of the present invention to give a pre-stress.
FIG. 14 is an enlarged view of a portion (part E) of the structure of FIG. 13.
FIG. 15 illustrates a structure having the same structure as that of FIG. 14 but having an increased quantity of steel wire means 403 as another embodiment of the present invention.
FIG. 16 illustrates a structure in which a ring brace reinforcement beam 413 is installed instead of the wire means 403 of FIG. 13 as another embodiment of the present invention.
17 is an enlarged three-dimensional view of a portion of FIG. 16.
Figure 18 shows another embodiment of the present invention that can be applied in the deep drilling site.
19 is a cross-sectional view of the retaining structure of FIG. 18.
20 to 23 show another form of retaining structure to which the ring brace means, the center brace means and the inclined brace means of the present invention are applied.
Fig. 24 shows an example of the one-side supporting method to which the present invention is applied.

The preferred embodiments of the present invention will be described with reference to the drawings.

Figure 2 is looking down from above the earthen structure according to an embodiment of the present invention (U direction in FIG. 1). The structure shown in Figure 2 is formed of several layers in the underground trench space.

The underground trench area is the outermost part in FIG. 2, and it is assumed that the trench area is a quadrangular shape. Soil walls 700, 701, 702 and 703 are formed along the circumference of the rectangle to withstand the earth pressure applied inward at the outermost part.

A circular ring brace means 200 is installed in the center of FIG. 2, and a plurality of central brace means 310 are installed along the circumference of the ring brace means 200.

The ring brace means 200 is preferably manufactured in a circular shape by interconnecting braces in the form of arches (arcs) prepared in advance at the construction site.

The term 'ring' of the ring prop means 200 has been named in view of what resembles a ring shape. In addition to the circular shape, the shape of the ring brace means 200 may be sufficient as an elliptic shape and may be manufactured as part of the circle (see FIG. 24).

The center brace means 310 is installed in a direction extending radially from the center of the circular ring brace means 200.

Inclined brace means (320,330) is coupled to one side of each of the center brace means (310).

The term 'inclined', which is called inclined prop means 320 and 330, is named because it is inclined at an angle from the longitudinal direction of the central prop means 310 based on the central prop means 310.

One end of the inclined brace means 320 and 330 is coupled to the central brace means 310 and the other end is connected to the ring brace means 200.

It is structurally stable that the inclined brace means 320 and 330 are formed to be symmetrical with respect to the center brace means 310.

In FIG. 2, A1, A2, and A3 have the same structure and include a ring brace means 200, a center brace means 310, and an inclined brace means 320 and 330. The post file 100 shown in FIG. 4 is omitted for convenience in FIG. 2.

A1, A2, and A3 are unit structures of the masonry structure and are the most important basic units of the entire masonry structure.

That is, ring brace means 200 formed in the shape of a portion of a circle or ellipse; And

A center brace means 310 coupled along the circumference of the ring brace means 200, coupled in a direction away from the center of the ring brace means 200 (the center of the circle or ellipse) (radial direction); and

One end is coupled to the center brace means 310, the other end is inclined brace means 320, 330 coupled to the ring brace means (200); and

A post pile 100 which is vertically coupled to the ring brace means 310, the lower end of which is buried underground; The structure including the will be an important basic unit of the entire earth structure shown in FIG.

Directions x and y in FIG. 2 are indicated for explanation of the structural analysis simulation results in FIGS. 9A to 12B.

The x direction indicates the tangential direction of the circle formed by the ring brace means 200. The y direction indicates the direction coming from the ground of FIG. 2 (ie, the direction opposite to the U direction in FIG. 1).

A plurality of peripheral braces 350 are installed at the four vertex portions of FIG. 2. The peripheral brace 350 serves to connect the retaining walls 700, 701, 702, 703 and the central brace 310. On the other hand, the shape of the peripheral brace 350 is disposed is possible in various forms, unlike FIG.

The first feature of the present invention is that the ring brace means 200 is installed in the central portion of the earth structure to be made at the time of underground excavation construction.

The second feature of the present invention is that in order to secure the structural stability of the ring brace means 200, the center brace means 310 and the inclined brace means 320, 330 is coupled along the circumference of the ring brace means 200. At this time, the load distribution support means 500 (see FIG. 6) is installed so that the concentrated load is not applied to the ring prop means 200.

The center of the ring brace means 200 is an empty space. That is, since no structure is installed in this area, the installation period of the earthquake structure is shortened, and construction vehicles and material movement are very easy.

FIG. 3 is an enlarged view of a portion A1 of FIG. 2, and FIG. 4 is a view of the structure of FIG. 3 viewed in the C direction (see FIG. 7). FIG. 5 is a view of the structure of FIG. 4 viewed from the D direction. FIG. 6 is a diagram illustrating components of the structure of FIG. 5.

3 to 6, only a portion of the circular shape (part A1 of FIG. 2), which is the overall shape of the ring brace means 200, is shown.

The ring brace means 200 is preferably formed of an H beam, but is not necessarily limited to this material.

Stiffeners 210, 211, 212, 213 and 214 may be further coupled to reinforce the ring brace means.

The upper support means 510 and the lower support means 520 are coupled around the ring brace means 200. This is to avoid the concentrated load on the ring brace means (200).

If the distal ends of the center brace means 310 and the inclined brace means 320, 330 are directly coupled around the ring brace means 200, it is not desirable in terms of structural stability. This is because the concentrated load acts on the ring brace means, which impairs the structural stability.

Therefore, after the upper support means 510 and the lower support means 520 are coupled along the circumference of the ring brace means 200, the center brace means 310 and the inclined brace means 320 and 330 are connected to the upper support means 510. It is preferable to be coupled to the lower support means (520).

By the upper support means 510 and the lower support means 520, the distal ends of the center prop means 310 and the inclined prop means 320, 330 serve to distribute the force applied to the ring prop means 200.

Post pile 100 is installed vertically on the ground serves to support the ring brace means 200, the center brace means 310 and the inclined brace means (320,330).

Ring brace fixing means (110, 120) is coupled to one side of the post pile (100). One of them is located below the ring brace means 200 and the other is located above the upper support means 510. By this structure, the ring brace means 200 can be effectively prevented from moving up and down.

The configuration of the structure of FIG. 3 will be described in more detail with reference to FIGS. 5 and 6.

The upper support means 510 and the lower support means 520 are also collectively referred to as load distribution support means 500.

One side of the load balancing support means 500 is coupled to the distal end of the center brace means 310 or the inclined brace means 320, 330, the other side of the load balancing support means 500 of the ring brace means 200 Coupled to the perimeter part. The ring brace means 200 and the load balancing support means 500 may collapse the ring brace means 200 when the contact area is reduced.

Therefore, the shape of one side portion of the load distribution supporting means 500 is preferably formed in the same manner as the circumferential shape (part of the arc) of the ring brace means 200 to increase the contact area as much as possible.

The upper support means 510 and the lower support means 520 is preferably formed in the form of a plate. However, the load distribution support means 500 can also be manufactured using steel, steel bars, steel pipes such as H beams. In one embodiment of the present invention, the load distribution supporting means 500 is configured in the form of a plate.

When the load distribution supporting means 500 is manufactured in a plate shape, reinforcing materials 531, 532, 533, 541, 542, 543, 551, 553 may be installed between the upper support means 510 and the lower support means 520 for strength reinforcement. The shape, position and number of such reinforcement may be variously modified unlike those shown in FIG. 5.

Connection plates 580, 581, 582 are formed at one side of the load distribution supporting means 500.

Connection plates 315, 325 and 335 are also formed at the distal ends of the center brace means 310 and the inclined brace means 320 and 330 and are coupled to the connection plates 580, 581 and 582. This coupling may be coupled by bolts or by welding.

Since a lot of load is applied to the position where the connecting plates 315, 325, 335 are coupled, the brace reinforcement 311, 321, 331 may be installed at the position shown in FIG. 5.

5 and 6 is only one embodiment of the present invention. In addition, those skilled in the art to which the present invention belongs can easily modify the coupling method, but all belong to the scope of the present invention.

FIG. 7 is a view illustrating a state in which the structure of FIG. 4 is connected to the earth wall by the structure B. Structure B is only one example and can be modified in other forms.

The structure B is coupled to the stripe of the wall 700, and the central brace means 310 is coupled to the structure B, so that it is possible to cope with the earth pressure applied to the wall 700.

The retaining wall 700 in the present invention is not limited to a particular form. That is, it may be made in various forms such as H pile earth plate, CIP, underground continuous wall or slurry wall. Those skilled in the art will be able to apply various types of retaining wall 700 to the blocking structure of the present invention.

FIG. 8A is an earth block structure having the same structure as that of FIG. 2, to perform structural strength simulation. FIG. And FIG. 8B is a simulation earth structure for comparing the structural strength with the earth structure shown in FIG. 8A.

In the present invention, the earth block structure shown in Figure 8a is presented as a preferred embodiment.

8b differs from the structure of FIG. 8a in that the central brace means 310 and the inclined brace means 320 and 330 are combined with the ring brace means 200.

That is, in the present invention, the end portions of the inclined brace means 320, 330 is coupled to the ring brace means 200, as shown in Figure 8a for the stability of the ring brace means.

9A to 12B are diagrams showing structural strength simulation results of the structures of FIGS. 8A and 8B. The conditions for applying the force are to apply 10 tons per length around the quadrilateral shape. Where ton is the mass unit of ton multiplied by the acceleration of gravity. This is referred to as tonf.

The results in FIG. 9A show the moments in the y direction for each structure. The y direction is the direction opposite to the U direction in FIG. 1 and is a direction perpendicular to the ground.

The maximum bending moment in the ring brace means 200 is 9.8 tonf-m.

In contrast, in FIG. 9B the maximum bending moment in the ring brace means 200 is 20.2 tonnes-m.

Therefore, since the bending moment of about 48.5% is applied in the case of FIG. 9A than in the case of FIG. 9B, it is confirmed that the structure is much more stable.

10A and 10B show the axial force applied to the retaining structure of FIGS. 8A and 8B, respectively.

The force (axial force) applied in the longitudinal direction of the ring brace means 200 is maximized at four places, including 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock, along the circumference of the ring brace means 200. appear.

Axial force is a force applied to the longitudinal direction of the brace or ring brace means, the larger the value is advantageous to ensure stability. Since the brace or ring brace means has a straight or rod shape having a predetermined length, the structural stability increases as the external force (earth pressure) is applied in the longitudinal direction (axial direction). In general, when the axial force is large, the bending moment becomes small and structurally more stable.

In FIG. 10A, the maximum axial force is about 110 tonf and in FIG. 10B, it is 103 tonf. That is, it was confirmed that the structure of Figure 8a is advantageous in securing the structural stability of the ring brace means 200.

11A and 11B show the shear force applied to the retaining structure of FIGS. 8A and 8B, respectively.

The shear force is calculated in the z direction, ie, in the direction toward the center of the circle formed by the ring brace means 200. Shear force means the force to cut the ring brace means 200.

In FIG. 11A, the maximum shear force applied to the ring brace means 200 is 11.5 tonf, and in FIG. 11B, it is 18.0 tonf. Therefore, the structure form as shown in Figure 8a, it is advantageous to ensure the structural stability of the ring brace means 200.

12A and 12B show the displacement amount applied to the retaining structure of FIGS. 8A and 8B, respectively.

The displacement at each location of the masonry structure is a vector of magnitude and direction. The direction (+ Dx) indicated in FIG. 12A is the + displacement direction. The direction toward the left is the minus direction.

The displacement amount in FIG. 12A is up to 1.4 centimeters and in FIG. 12B up to 1.46 centimeters.

Therefore, the structure of FIG. 8a was confirmed to have structural stability in terms of displacement.

9A to 12B, the structure of the structure in which the structure in which the center prop means 310 and the inclined prop means 320 and 330 are supported toward the ring prop means 200 is very structurally shown. It could be confirmed that it is stable.

FIG. 13 shows another embodiment of the present invention in which the steel wire means is coupled to the ring brace means. FIG. 14 is an enlarged view of a portion (part E) of the structure of FIG. 13.

In order to further secure the stability of the ring brace means 200, prestress means may be further provided. The prestress means are intended to give tension to the ring brace means in advance.

As one example of such prestress means, steel wire means 400, 401, 402, 403 may be used.

Steel wire means (400, 401, 402, 403) is preferably installed symmetrically symmetrically with respect to the center of the ring brace means 200 inside the ring brace means 200 (see Fig. 13). (Overall, line segment connecting two points of arc)
These steel wire means to give a tension force (leading tension) to the ring brace means in advance to play a role to increase the stability of the weak part of the load structure in which the load is concentrated.

Of course, it is also possible to use a steel bar instead of the steel wire means (400, 401, 402, 403) to tension. The steel wire can exert only tension, but the steel rod has the advantage of being able to withstand the compressive force.

As shown in FIGS. 14 and 15, the steel wire means 403 is formed across the steel wire support 451.

The wire support 451 is supported by the wire support lower portions 450 and 452. The steel wire means 403a may be formed in plural as shown in FIG. 15. The steel tip 403b is fixed by the steel tip fixing means 408. The installation position, form and number of the steel wire means can be variously modified.

FIG. 16 illustrates a structure in which a ring brace reinforcement beam 413 is installed instead of the wire means 403 of FIG. 13 as another embodiment of the present invention. 17 is an enlarged three-dimensional view of a portion of FIG. 16.

In FIG. 14, the steel wire means 403 perform only a function of pulling the ring brace means 200 connected to the distal end thereof, while the ring brace reinforcement beam 413 of FIG. 17 is a ring brace as part of the structure together with the brace and the ring brace. It also serves to distribute the force toward the means 200, and also serves to withstand the moment.

The prestress means (steel wire, steel bar, beam) may be provided with any one of steel wire, steel bar, beam or a combination of two or more thereof.

While preferred embodiments of the present invention have been described, there can be various other modified embodiments.

18 is another embodiment of the present invention that can be applied at a deep drilling site, as seen from the top of the trench construction site. 19 is a side cross-sectional view of the retaining structure of FIG. 18.

When the depth of the underground trench is deep as shown in FIG. 19, a strong earth pressure is applied. In this case, the ring brace means 202 having a smaller diameter may be further provided inside the ring brace means 202 shown in FIG. 8A. At this time, the ring connecting means 800 for connecting the inner and outer ring brace means (200,202) is further required. In addition to the arrangement of the ring connecting means 800 shown in Figure 18 it is obvious that it can be configured in other forms.

It is structurally preferable that the two ring brace means 200, 202 form concentric circles.

The inner and outer ring brace means 200 and 202 are preferably manufactured in a circular shape by interconnecting pre-arranged braces (not shown) at a construction site. This is due to the convenience of material transportation. Arch-shaped braces are part of a circle, and the method of joining them is not limited to one particular method.

In order to support the inner ring brace means 202, a plurality of post piles 102 are further required. For convenience, the illustration of the post piles is omitted.

If the underground depth is deeper, it is of course also possible to increase the number of ring prop means 202.

20 to 24 show another form of retaining structure to which the ring brace means, the center brace means and the inclined brace means of the present invention are applied.

When there is a margin of land boundary in the excavation work site, it is possible to configure the earth block structure in the form as shown in Figure 20, the present invention shows that the earth block structure can be modified in various forms according to the various work site conditions.

The ring brace means 200 in the present invention need not necessarily be circular, and can be sufficiently applied in the form of a semicircle or other arc. That is, it may not be in the form of a complete circle as shown in FIGS. 22 to 24 depending on the construction site situation. In the structures of FIGS. 20 to 24, all of the structures of the parts A1, A2, and A3 shown in FIG. 2 are employed.

100, 102: Post pile 110, 120: Ring brace fixing means
111,121: bolt 200,202: ring brace means
210,211,212,213,214: Reinforcement
310: center brace means
320,330: Sloped prop means
350: brace 311,321,331: brace reinforcement
400,401,402,403,403a: steel wire means
403b: steel wire end 408: steel wire end fixing means
413: ring brace reinforcement beam
450,452: steel support
451: steel wire support
500: load distribution support means
510: upper support means
520: lower support means
531,532,533, 541,542,543,551,553: reinforcement
580,581,582,315,325,335: connection plate
700,701,702,703: stain wall
800: ring connecting means

Claims (7)

delete Retaining wall of the earth excavation site is formed inside the wall, a circular or oval ring brace means; and a plurality of central brace means coupled along the circumference of the ring brace means 200 and combined in the form of radial symmetry And, a plurality of inclined brace means coupled to the ring brace means 200; and a plurality of post piles coupled to the ring brace means and buried underground; In the unit structure for structural stability of the ring brace means 200 of the entire earth structure including a,

The unit structure,
Ring brace means 200 formed in the shape of a circle or an ellipse (arc);
A center brace means 310 coupled along the circumference of the ring brace means 200, coupled in a direction (radial direction) away from the center (center of a circle or ellipse) of the ring brace means 200;
One end is coupled to the center brace means 310, the other end is inclined brace means 320, 330 is inclined to be mutually symmetrical with respect to the center brace means (310) toward the ring brace means (200);
A post pile 100 which is vertically coupled to the ring brace means 310, the lower end of which is buried underground; And
A load distribution support means 500 formed around the ring brace means,
One side of the load distribution support means 500 is coupled to the distal end of the center brace means 310 or the inclined brace means 320, 330,
The other side of the load distribution support means 500 is coupled to the circumferential portion of the ring brace means 200 to prevent structural load from being applied to the ring brace means 200, characterized in that structural stability can be achieved.
Unit structure of the retaining structure.
delete delete In the basement structure for underground excavation construction,
Ring brace means 200 formed in the shape of a circle or ellipse;
A plurality of central brace means (310) coupled along the circumference of the ring brace means (200) and coupled to the ring brace means (200) in a radial symmetry form;
One end is coupled to the central brace means 310, the other end is a plurality of inclined brace means 320, 330 coupled to the ring brace means (200);
A plurality of post piles (100) formed along the circumference of the ring brace means (310), the lower ends of which are buried underground, while being vertically coupled to the ring brace means (310);
Including,
A ring brace means 202 having an inner diameter smaller than the ring brace means 200 is further provided inside the ring brace means 220, and the two ring brace means 200 and 202 form concentric circles. , Soil structure, characterized in that coupled to each other by a predetermined ring connecting means (800). In the basement structure for underground excavation construction,
Ring brace means 200 formed in the shape of a circle or ellipse;
A plurality of central brace means (310) coupled along the circumference of the ring brace means (200) and coupled to the ring brace means (200) in a radial symmetry form;
One end is coupled to the central brace means 310, the other end is a plurality of inclined brace means 320, 330 coupled to the ring brace means (200);
A plurality of post piles (100) formed along the circumference of the ring brace means (310), the lower ends of which are buried underground, while being vertically coupled to the ring brace means (310);
Including;
Pre-stress means is further installed on the inner surface of the ring brace means 200,
The prestress means is a combination of any one or two or more of the steel wire means 403, ring brace reinforcement beam 413, steel bar,
The prestress means are formed symmetrically with respect to the center point of the ring brace means 200,
The form of the prestress means forms the form of a string (a line segment connecting two points of an arc),
By both ends of each prestress means are coupled to the inner side of the ring brace means 200,
Block structure, characterized in that to apply a pre-load (pre-stress) to the ring brace means (200).


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