KR101080157B1 - Enlarged endbearing capacity foundation using cone with screw and it's dry process of construction work - Google Patents

Abstract

The present invention relates to an extended tip support base using a cone base provided with a screw and a dry construction method thereof.

Expanded tip support foundation dry construction method using a cone base equipped with a screw of the present invention, after selecting the foundation installation location after the foundation installation ground location selection step; A hollow pipe-shaped column is installed on the upper part, and the upper part has a larger diameter than the column diameter, and is formed in the shape of a cone that gradually decreases in diameter as it goes to the lower part, and has an accommodating part therein. A grout step of preparing a cone foundation having a screw blade having a small size of a clausoid curve, and then filling grout material or concrete in the pillar and the receiving portion of the cone foundation; Conical base filled with grout material or concrete in the installation and inside the column in the installation position and then drilling the foundation to a predetermined depth by using a rotation and indentation to the self-puncture; consists of.

According to the present invention, it is made of a reinforced material such as steel (steel) or reinforced plastics, and excavates the ground by direct self-punching of a cone-based expansion base in which a grout material or concrete is filled therein, so that a predetermined quality ground can be excavated. By positioning, the expansion base can be easily installed to prevent loosening or displacement of nearby ground or structure due to excavation, and the excavation and backfilling process can be omitted, and economic expansion can be easily and easily installed. By installing the foundation with the calculated cross section, it is not only easy to secure accurate tip bearing capacity, but also the number of piles can be significantly reduced, so that the economic effect is large. Noise and vibration when installing pile foundations, The bearing capacity of the pile is increased as a whole through the positive increase of the tip bearing capacity, which prevents and reduces the bearing capacity due to rotation and indentation.

Screw, Cone Foundation, Tip Support Foundation, Pile, Grout

Description

Expanded tip support base using screw base with screw and dry construction method {ENLARGED ENDBEARING CAPACITY FOUNDATION USING CONE WITH IT'S DRY PROCESS OF CONSTRUCTION WORK}

In addition to industrial development, various facilities and structures as well as residential facilities are needed, and thus various types of foundations are required to safely support these structures.

In recent years, there have been many cases in which structures have to be installed on soft soils such as river alluvial layers composed of soft fine-grained soils and coastal tidal flats, as well as high-quality soils.

The most commonly used foundation methods are footing foundation and pile foundation.

Expanded foundation is the most common and simple method of direct footing or shallow footing, where the high quality ground is relatively close to the surface, which enlarges the foundation section to increase the bearing capacity. The ground is not located near the surface, so it is a representative method of deep foundation that transfers loads through piles to high quality ground in the ground.

The present invention relates to a construction method that can be used for these two types of foundation, the installation of the expansion base, but excavating the ground to the place where the foundation is located, the foundation is installed and then backfilling to position the foundation at a predetermined position Unlike the traditional method, the foundation is installed by reinforcing a cone-shaped reinforced foundation with a cross section of the enlarged foundation, but before the installation, the grout material or concrete is filled in the cone foundation to complete the foundation. It is a simple and economical method that eliminates artificial work such as excavation and backfilling, and in the case of pile foundations, it has a conical foundation with screws that has an enlarged end section larger than the cross section area of the pile, which greatly increases the tip bearing capacity. The extended tip support base used and the dry construction method thereof.

Most structures are located on high quality ground.

In order to be placed on a good ground, a foundation is installed under the structure, which is planned to keep the structure safe.

These foundations can be divided into shallow foundations and deep foundations, depending on whether high-quality grounds capable of holding the structure are located near the earth's surface.

The shallow foundation is a technique that transfers the load of the structure directly to the high quality ground.

Expanding foundation is the most widely used method to reduce the load per unit area and increase the bearing capacity by enlarging the base surface in contact with the high quality ground.

The deep foundation is a method of installing other structures such as piles to transfer the load of the structure to the high quality ground because the high quality ground is relatively deep on the ground, and there are pile foundations. If the good soil is located at a depth of about 4 to 5 times the foundation width, it can be classified as a deep foundation.

The enlarged foundation is excavated from the ground surface to the point where the foundation is located, and then the formwork is placed on the foundation section, reinforced with reinforcement such as reinforcing bars, then cast concrete, cured, and then backfilled to complete the load. While the foundation section is larger than the column, it is advantageous in terms of bearing capacity.However, a series of work processes such as excavation, formwork, concrete placement, curing and formwork removal, and backfilling are required, especially through soft ground. When the ground is excavated, the excavation surface is easily collapsed, so it is necessary to excavate the ground with a gentle slope so as not to install additional temporary facilities or collapse, so that the site is greatly required, additional costs are added, and the construction process is complicated. There is a problem.

Pile foundations are made by striking the pre-fabricated piles to high quality ground and perforated by augers, etc., and then pre-fabricated piles are installed in the drill holes or concrete is poured directly into the drill holes in the field. Can be divided in a way.

The pile foundation is a method that transfers the load of the structure to the high quality ground through the pile and obtains the supporting force of the foundation by the sum of the tip support of the pile end and the friction support around the pile, which is difficult to enlarge the foundation cross section. If the cross section is large, it is difficult to install, and in general, several piles with a small cross section should be installed. Therefore, noise and vibration are a problem when driving to install the pile. Since the number of pile installations is increased as compared to the case of installing piles by the driving method, there is a problem such that the cost is greatly increased compared to the expansion base.

If the driving is not possible due to the noise and vibration problems at the time of driving, the drilling method is to use the perforated pile foundation method, in which a perforator such as an auger is installed and a pile is installed in this case. As small piles are installed, frictional support becomes smaller than that of driving type, and slime builds up in the lower part of the drilled hole, which reduces the complex bearing power. Excavation and rotationally press-fit the pile with screws ('Pile method of screw with conical tip' of Korean Patent Publication No. 10-0396393), or increase the frictional cross-section by partially attaching the attached section (Korea Patent Publication No. 10-0690014 'Steel Structure with Spiral Plate'.

In this case, by installing piles with screws, it is possible to restrain the reduction of frictional support compared to the conventional drilling method, but in the case of soft ground, the tip support appearing at the end of the pile mainly depends on the size of the support. Considering the fact that it is necessary to increase the tip area of the pile in order to increase the bearing capacity, there is a limit to this, and the method of increasing the cross section of the frictional resistance by partially increasing the attachment cross section disturbs the ground during installation. Although the frictional resistance per unit area is reduced and the attached cross section is enlarged, the effect is limited to design consideration.

On the other hand, in order to increase the bearing capacity of piles, there is a method of reinforcing the ground by injecting mortar into it when the foundation is soft (Korean Patent Publication No. 10-0792130, 'Push-in Steel Pipe Pile Method'). In the case of a small diameter micro pile method that minimizes the effect, a method of increasing the stability of the ground by pressurizing grout injected into the drilling hole to increase the bearing capacity (Korean Patent Publication No. 10-0779988 The method of pile construction ') increases the effectiveness of pile foundations.In this case, the injection of grout into the ground is highly dependent on the soil conditions.In general, in order to facilitate the injection of grout, such as cement paste or cement mortar in the ground, The gap between grout must be large, otherwise the actual injection is difficult, so pressurization Performing for the even and is a difficult problem check for the pressure effect when, typically can not help but be limited There to be increased based on force of the close-based front end there is utilized a lot of ways of mixing the excavated with mortar ground.

The expansion tip support base and the dry construction method using the cone base provided with the screw of the present invention to solve the problems caused in the prior art, artificially excavating the ground and install the expansion base by pouring concrete Unlike the conventional method, the backfill is filled with grout material or concrete in advance in a cone-shaped expansion base made of reinforced material such as steel or reinforced plastic, and then excavated with direct drilling to obtain a predetermined quality. As a result, the expansion base can be installed much more easily than the conventional method, thereby preventing the occurrence of loosening or displacement of nearby ground or structure due to excavation, and eliminating the process of excavation and backfilling. The purpose is to provide a foundation and construction method.

More specifically, in the case of pile foundations, it is difficult to increase the tip bearing capacity because the foundation cross-section is small, and consequently, a large number of pile foundations have to be installed. Although grout is being carried out to secure the effect, it is not only easy to secure accurate tip bearing capacity but also the number of piles can be significantly reduced by installing a foundation having a pre-calculated cross section in a state of doubt about its effect. The economic effect is great, and the installation method is simple, so that it is easy to secure the bearing capacity of the pile foundation.

In addition, it is possible to prevent noise or vibration when installing pile foundations by not applying the external driving force, and to reduce the bearing capacity by loosening the ground due to rotation and indentation. It is to increase.

In particular, in order to be installed in the ground by rotating and press-fitted to install the foundation of the cone-shaped steel base on the ground, in the present invention, a screw blade is required outside the cone-shaped foundation. It is possible to reduce the cost of screw manufacturing by simply forming a screw blade having a closed shape that gradually decreases in diameter toward the end of the cone without additional binding, and the excavation progresses naturally from the end of the cone during excavation. It is intended to be expanded gradually.

In order to solve the above problems, the enlarged tip support foundation dry construction method using the cone foundation provided with the screw of the present invention is provided with a pipe-shaped column having an upper portion, and the upper portion having a diameter larger than the pillar diameter. It is formed in the shape of a cone that gradually decreases in diameter as it goes to the bottom, and has a receiving part inside, and prepares the cone base having a screw blade of a clasoid curve shape that gradually decreases the radius of curvature on the outer peripheral surface. Grout step of filling the grout material or concrete in the column and the receiving portion; And a perforation step of drilling the foundation to a predetermined depth by rotating and indenting the foundation with self-perforation after positioning the cone base filled with grout material or concrete at the inside and the receiving part.

Expanded tip support foundation dry construction method of the present invention, after selecting the foundation installation location after the foundation installation ground location selection step; The rod-shaped pillar is installed, the upper portion has a diameter larger than the pillar diameter and is formed in the shape of a cone which gradually decreases in diameter as it goes to the lower portion, and has an accommodating portion therein, and a closed radius gradually decreasing in the outer circumferential surface thereof. Cone foundation step is provided with a screw blade of a curved shape, preparing a cone foundation filled with grout material or concrete in the receiving portion; Conveying step of positioning the base of the grout material or concrete filled in the receiving portion in the installation position and then drill the foundation to a predetermined depth using rotation and indentation by self-punching.

At this time, the upper portion of the cone base is characterized in that 2 to 5 times larger than the diameter of the pillar.

In addition, the expanded tip support base using a cone base provided with a screw of the present invention is constructed by any one of the above construction method, is formed in the shape of a rod, and the pillar is inserted into the ground; It is installed in the lower part of the column, the upper part has a diameter larger than the column diameter, and is formed in the shape of a cone which gradually decreases in diameter as it goes down, and has a receiving part inside, and the receiving part is filled with grout material or concrete, and the outer peripheral surface Characterized in that consisting of; cone foundation is provided with a screw blade in the form of a clausoid curve gradually decreases in the radius of the curve.

According to the present invention, in contrast to the conventional method of artificially excavating the ground and placing concrete and then backfilling the grout, the grout inside the cone base made of a reinforced material such as steel or reinforced plastic Excavate the ground with self-puncture in the state prepared by filling with ash or concrete and install it on a predetermined high quality ground to prevent the occurrence of loosening or displacement of nearby ground or structure due to excavation, and the process of excavation and backfilling is omitted. Economical and easy to construct

More specifically, in the case of pile foundations, it is difficult to increase the tip bearing capacity because the foundation cross-section is small, and consequently, a large number of pile foundations have to be installed. Although grout is being carried out to secure the effect, it is not only easy to secure accurate tip bearing capacity but also the number of piles can be significantly reduced by installing a foundation having a pre-calculated cross section in a state of doubt about its effect. The economic effect is great, and the installation method is simple, so that the bearing capacity of the pile foundation can be secured easily.

In addition, it is possible to prevent noise or vibration when installing pile foundations by not applying the external driving force, and to reduce the bearing capacity by loosening the ground due to rotation and indentation. It can be increased.

In particular, in order to install the cone-shaped steel expansion support base in the ground through rotation and indentation, screw blades are required outside the foundation of the cone shape. In the present invention, a cone, a pipe, a wire rope, and a steel sheet can be simply It is possible to reduce the cost of screw manufacturing by forming a screw blade having a closed shape that gradually decreases in diameter toward the end of the cone, and the cross-sectional area can be gradually enlarged as the excavation proceeds naturally from the end of the cone. .

FIG. 1 is a schematic diagram of a general enlarged foundation, FIG. 1A is a rectangular enlarged foundation, FIG. 1B is a circular enlarged foundation, and FIG. 2 is a schematic diagram of a general pile foundation. Is a perspective view of the construction of a pile made of steel (steel) or reinforced concrete in advance, Figure 2 (B) is a cross-sectional view of the construction of the site pile to be installed in the site after the excavation to the predetermined depth to install concrete in the excavation site to be.

On the other hand, Figure 3 is a perspective view of the extended tip support base of the present invention applied to the enlarged base, Figure 3 (A) shows the shape of the cone and the cylinder coupled, Figure 3 (B) is a cone-shaped enlarged tip support The basics are shown.

In addition, Figure 4 is a perspective view of the application of the screw blade 400 applied in Figure 3, Figure 5 shows a state before installation of the screw blade 400 applied by FIG.

6 is a cross-sectional view of a plurality of enlarged tip support foundations of the present invention constructed on a soft ground, and FIG. 7 is a cross-sectional view according to an embodiment of an enlarged tip support foundation installed on a soft ground. ) Shows the retaining wall structure, and FIG. 7 (B) shows the basic embodiment of the pipeline to be embedded.

8 is a schematic view showing another enlarged basis of the present invention, Figure 9 shows the construction sequence of the expanded base of the present invention.

In addition, FIG. 10 shows an example in which the expanded tip support base of the present invention is constructed in the form of a group pile, and FIG. 11 shows an example in which a plurality of pillars 100 are installed in one cone foundation 300 in the present invention. .

3 to 4, the extended tip support base using the cone foundation provided with the screw of the present invention includes a pillar 100 formed in a rod shape and inserted into the ground; It is installed in the lower part of the pillar 100, the upper part has a diameter larger than the diameter of the pillar 100, and is formed in a cone shape gradually decreasing in diameter as it goes down, and has a receiving part inside, and the receiving part has grout material or concrete. Is filled, and the cone base 300 is provided with a screw blade 400 of the clasoid curve shape that gradually decreases the radius of curvature on the outer peripheral surface.

At this time, the pillar 100 is preferably made of a cylindrical grout material or a pipe is installed outside thereof.

The extended tip support base of the present invention having the above configuration shows the effect of increasing the supporting force by expanding the foundation cross-sectional area for the purpose of increasing the tip bearing capacity of the enlarged foundation and the pile foundation through the soft ground.

As shown in Figures 3 and 4 when the column 100 or the pile tip cross-sectional area is enlarged, the tip bearing capacity is increased. To see this, first, the general allowable bearing capacity per unit area for the enlarged foundation of the direct foundation is shown.

In general, if the foundation is located on the high quality ground, the allowable bearing capacity increases in proportion to the size of the foundation width B. Therefore, the larger the width B is, the more favorable it is, and the load per unit area by the upper load Q, that is, the working pressure q = Q / A, The larger the cross-sectional area A, the smaller the working pressure q. As a result, the relationship between the allowable bearing force per unit area and the working pressure is q _a Since the condition of q must be satisfied, expansion of the foundation section is essential for establishing a safe foundation.

Meanwhile, in the case of pile foundations, the ultimate bearing capacity Qu is the sum of the tip bearing force Qp and the friction bearing force Qs, and the allowable bearing force Qa is obtained by dividing the ultimate bearing force Qu by the safety factor Fs.

The tip bearing force Qp = qu · Ap is the product of the tip bearing force qu per unit area and the tip area Ap, so that the bearing capacity of the pile increases as the tip area Ap of the pile increases.

On the other hand, the screw blade 400 installed outside the cone foundation 300 can be easily bonded using a property that the cross section of the cone foundation 300 is expanded upward without welding or any separate binding device.

4 is an embodiment in which the screw blade 400 is installed in the present invention, using a steel plate, the curved radius is gradually cut into the form of a closed clausoid in the form of a closed clausoid curve, and then the central portion has a more curved radius. Iron plate-type screw blades 400 made by removing the cloth in the form of the same shape as the small outer portion and then cutting one side and relaxing up and down; A wire rope-type screw blade 400 made of a wire rope that is properly wound toward the top of the cone after binding the wire rope to the cone end outside the cone foundation 300; There is a steel snail-shaped screw blade 400 is bent in the form of a snail-shaped pipe or steel rod to be closed in the form of a clausoid, which is installed on the outside of the cone, these screw blade 400 is the top of the cone from the cone end It can be easily installed without any binding means by using a property that gradually increases in diameter, and when the ground is excavated for the foundation installation, it is naturally bound to the outside of the cone has the characteristic that the screw wing 400 is formed.

5 is a detailed view of the screw blade 400 of the present invention shown in FIG. 4 and the curve drawn at this time is connected to the point where the continuous screw blade 400 is located on the outside of the cone-shaped cone base In the present invention, in order to install a screw blade 400 of one wheel as shown in (A) and (B) of FIG. 4 because the curved radius is continuously reduced toward the end of the cone. As the (A), (B) of the screw blades are formed in the form utilizing the properties of the clausoid curve to form a screw blade 400 is in close contact with the outside of the cone, the screw blade is easily coupled without a separate binding means 400 has a characteristic that is formed, Figure 5 (C) is for the screw blade 400 by a pipe or steel bar, which is bent in the form of gradually decreasing diameter in the form of a snail form cone in the form of clausoid That it is installed in close contact with the outside to easily install the screw blade 400 results in no extra means.

On the other hand, the pillar 100 in the present invention is formed by filling the grout material or concrete inside the pipe of steel or FRP material as shown in Figure 3, or may be composed of only grout material or concrete as shown in FIG. have.

However, most preferably, it is formed by filling grout material or concrete in the pipe.

In addition, the pillar 100 is not limited to being installed only one cone base 300, a plurality of pillars 100 may be installed in one cone base 300 as shown in FIG. will be.

Figure 6 is a perspective view of the foundation is installed on the upper side after the foundation of the present invention applied to the pile foundation, the extended tip support pile foundation of the present invention.

7 is a cross-sectional view showing the foundation of the retaining wall and the irrigation canal installed in the soft ground according to the present invention shows a state that is constructed on a solid ground through the soft ground.

If described in detail through the flow chart of Figure 9 attached to the extended tip support base dry construction method using a cone base equipped with a screw of the present invention configured as described above are as follows.

First, after arranging foundation installation grounds, the foundation installation position is selected.

The ground clearance and selection of foundation installation locations follow a variety of known methods.

Then, a pipe-shaped column 100 having an empty inside is installed at the upper portion, and the upper portion has a diameter larger than the diameter of the pillar 100 and is formed in a cone shape gradually decreasing in diameter as the lower portion thereof has an accommodation portion therein. After preparing the cone foundation 300 is provided with a screw blade 400 of the clasoid curve shape that gradually decreases the radius of curvature on the outer peripheral surface and grout in the pillar 100 and the receiving portion of the cone foundation 300 Filling the ash or concrete to cure prepares the base of the cone (300).

The preparation of the cone foundation 300 and the basic position setting may be separately performed regardless of the order.

After preparing the cone foundation 300, the cone foundation 300 is placed in the installation position, and then the construction of the expanded tip support foundation of the present invention is carried out by drilling the foundation to a predetermined depth using rotation and indentation. The process is finished.

In addition, the method for constructing another foundation of the present invention, the preparation of the cone base is to prepare a rod-shaped pillar 100, at this time, the pillar 100 is a cylindrical type made of a grout material or concrete cured without a pipe Prepare the column 100, or prepare a cylindrical column 100 wrapped with a pipe on the outer peripheral surface of the grout or concrete rod.

On the other hand, the upper diameter of the cone base 300 is preferably formed to be 2 to 5 times larger than the diameter of the column 100 to ensure a sufficient cross-section.

When the pillar 100 is installed in the constitution base 300 in the above configuration, as shown in the lower part of the pillar 100, a -shaped or + shaped deformation preventing member 200 is installed to the upper pillar 100 and the upper portion. It is preferable to integrate the cone foundation 300, so that the cone foundation 300 is not deformed or destroyed during rotation and indentation by the deformation preventing member 200.

In addition, when the deformation preventing member 200 is installed before the grout, the deformation preventing member 200 may be formed in a hollow pipe shape so that the deformation preventing member 200 serves as a frame.

In addition, when the deformation preventing member 200 is formed in an empty pipe shape, a hole 210 is formed above and below the deformation preventing member 200 so that grout material or concrete may be injected and dispersed using the hole 210. It would be desirable to configure so that.

In addition, Figure 10 is another example of applying the extended tip support base of the present invention, generally the group pile (group pile) effect does not appear unless the gap of the pile is less than three times the diameter of the pile tip, the general pile Column cross-section is relatively small, it is difficult to see the group pile effect, in the case of the expanded tip support base of the present invention can be easily seen the group pile effect because the diameter of the upper surface of the cone base 2 to 5 times larger than the column diameter.

In this case, the overall bearing capacity is multiplied by the number of piles by the bearing capacity of a single pile, and the bearing capacity is not determined and a large expansion base of B × L is assumed to be installed. do.

As such, the extended tip support base and construction method of the present invention may be applied and used as a basis of various structures.

In the case of a nearby structure or a place where ground relaxation is a problem, it was difficult to install the expansion foundation by the conventional method, but by the present invention it is possible to easily install the expansion foundation without the operation of ground excavation or backfilling, In this case, by increasing the tip bearing capacity of the pile by increasing the tip area that meets the solid ground, it is possible to reduce the number of pile foundations installed by the existing method and to make economical construction. The design will be able to secure more support.

The expanded tip support base and the dry construction method using the cone base equipped with the screw of the present invention will be easily applied to the small diameter pile or slope activity restraint method, and the restraint method for stabilizing the soft ground. .

1 is a schematic diagram of a conventional enlarged basis.

(A): Schematic of square enlargement basis.

(B): Schematic diagram of the circular enlargement basis.

Figure 2 is a schematic cross-sectional view showing a state of a conventional pile foundation.

(A): Cross-sectional schematic which shows the cross section of the pile foundation of a ready-made product.

(B): Schematic diagram showing a cross section of a field-pound pile foundation.

Figure 3 is a perspective view showing an enlarged basis applied to the direct foundation of the present invention.

(A): The perspective view which showed the cross section of the shape of the expanded cross section combining the cone and the cylinder.

(B): A perspective view in which the enlarged cross-sectional shape shows a cone-shaped cross section.

Figure 4 is a perspective view showing the shape of the screw blade of the present invention.

5 is a schematic view showing a manufacturing method according to the form of the screw blade of the present invention.

Figure 6 is a schematic diagram of an example installed through the soft ground as a retaining wall and irrigation channel foundation of the present invention.

Figure 7 is a cross-sectional view showing the foundation of the retaining wall and irrigation canal installed in the soft ground according to the present invention

8 is a perspective view showing another enlarged basis of the present invention.

9 is a construction flowchart showing the construction sequence of the extended tip support base of the present invention.

Figure 10 is a schematic diagram showing an example of the extended tip support base of the present invention constructed in the form of a group pile.

Figure 11 is a schematic diagram showing an example in which a plurality of pillars are installed in one cone foundation in the present invention.

<Detailed Description of Major Symbols in Drawing>

100: pillar 200: deformation preventing member

210: hole 300: cone foundation

400: screw wing

Claims (4)

delete In the extended tip support base dry construction method, A position selection step of selecting a foundation installation position after arranging foundation installation grounds; The upper part of the pillar-shaped pipe 100 is installed inside, the upper portion has a diameter larger than the diameter of the pillar 100 is formed in the shape of a cone that gradually decreases in diameter as it goes down and has an accommodating portion therein, outer peripheral surface After preparing the cone foundation 300, which is provided with a screw blade 400 of the clasoid curve shape that gradually decreases the radius of the curve in the grout material or concrete in the pillar 100 and the receiving portion of the cone foundation 300 Filling grout step; Including a drilling step of drilling the foundation to a predetermined depth by rotating and indenting the foundation by positioning the cone foundation 300 filled with grout material or concrete at the installation location inside and on the receiving part 100. Composed, In the grout step, the lower portion of the pillar 100, the inside of the hollow pipe shape, and fixed to the deformation preventing member 200 is formed with a plurality of holes on the outer peripheral surface, the front end of both sides of the deformation preventing member 200 After fixing to the cone base 300, characterized in that to fill the grout material or concrete, An extended tip support foundation dry construction method using a cone foundation equipped with a screw. 3. The method of claim 2, The upper portion of the cone foundation 300 is characterized in that the diameter of 2 to 5 times larger than the pillar 100, An extended tip support foundation dry construction method using a cone foundation equipped with a screw. In the extended tip support base, Constructed by the construction method of claim 2, A pillar 100 formed in a rod shape and inserted into the ground; It is installed in the lower portion of the pillar 100, the upper portion has a diameter larger than the diameter of the pillar 100, is formed in the shape of a cone that gradually decreases in diameter as it goes down, has a receiving portion inside, the receiving portion is a grout material or Cone foundation 300 is filled with concrete, the screw blade 400 of the clasoid curve shape is gradually installed on the outer circumferential surface of the curved radius; The grout material or concrete is filled inside, the upper portion is fixed to the lower portion of the column 100, both ends are fixed to the inner wall surface of the cone base 300, the deformation preventing member 200 formed a plurality of holes on the outer peripheral surface ) Is further installed, Extended tip support base using cone base equipped with screws.

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