KR101080160B1 - Construction work apparatus for enlarged endbearing capacity foundation with clothoid screw - Google Patents

Abstract

The present invention relates to an enlarged tip support foundation construction apparatus having a screw blade in the form of a clausoid.

The expanded tip support base construction device having a screw blade of the clausoid type of the present invention is provided with a hollow tubular pillar and a lower portion of the pillar, and the upper portion has a diameter larger than the pillar diameter and gradually goes to the lower portion. A cone base formed in a cone shape having a reduced diameter and having a receiving portion to accommodate grout material or concrete therein; It is configured to include; screw blades are installed in the form of a clausoid curve that gradually decreases the radius of curvature along the lower outer peripheral surface of the cone foundation.

By the expanded tip support base construction device of the present invention, by directly excavating the ground by self-puncture, it is possible to easily install the expansion foundation in a predetermined high-quality ground to prevent the occurrence of loosening or displacement of nearby ground or structure due to excavation and It is possible to install the expansion base economically and easily by eliminating the process of excavation and backfilling, and by installing the foundation with the pre-calculated cross section, it is not only easy to secure accurate tip bearing capacity but also significantly reduce the number of piles. Economical effect is large, and the installation method is simple, so it is easy to secure the bearing capacity of the pile foundation, and it is possible to prevent the noise or vibration when installing the pile foundation and to prevent the rotation and indentation by applying no external driving. Due to the fact that the ground is relaxed and the bearing capacity decreases, Overall, it increases the bearing capacity of the pile.

Cone foundation, tip support foundation, pile, grout

Description

TECHNICAL FIELD APPARATUS FOR CONLARUCING WORK APPARATUS FOR ENLARGED ENDBEARING CAPACITY FOUNDATION WITH CLOTHOID SCREW}

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, and various construction methods are required to safely install foundations on such soft 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 apparatus that can be used for these two basic constructions, that is, a formwork, to install the enlarged foundation, but excavated the ground to the place where the foundation is located, install the foundation and then backfill the predetermined position Unlike the existing traditional method of placing the foundation, it is simple and economical to eliminate the artificial work such as excavation or backfilling by installing the expansion foundation by self-punching reinforced cone-shaped foundation with the cross section of the expansion foundation. In the construction method, the pile foundation has an enlarged end section larger than the cross-sectional area of the pile to significantly increase the tip support force, and relates to an enlarged tip support foundation construction apparatus having a screw blade in the form of a clausoid.

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 foundation is a method of installing piles by hitting the pre-fabricated piles to high quality ground and drilling by augers, etc. and then installing pre-made piles in the drilling holes or casting concrete directly in the drilling holes in the field to manufacture piles. Can be divided into

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 suppress the reduction of frictional support compared to the conventional drilling method. However, in the case of soft ground, the tip support appearing at the pile end rather than the frictional support mainly determines 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.

Expanded tip support base construction device having a screw blade of the present invention is to solve the problems that occur in the prior art as described above, after artificially excavating the ground and installing concrete to install the expansion base Unlike the conventional method, the backfill is excavated with the self-perforation of the enlarged foundation of the present invention having a screw blade in the form of a cladding and placed in a predetermined high quality ground, and then a grout or concrete such as cement mortar is formed in a cone shape. Filling the inside of the foundation or inserting the cone foundation in the form of cones and pillars using grout or concrete in advance, consequently allowing the expansion foundation to be installed much more easily than the conventional method, so that nearby ground or structures are relaxed due to excavation. Or prevent displacement and avoid the excavation and backfilling process. It is to provide a factory factory that is 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 it is easy to secure the bearing capacity of the pile foundation.

Expanded tip support base construction device having a screw blade of the clausoid form of the present invention, in order to solve the above problems, and the tubular column hollow inside; A cone base installed in a lower part of the column, the upper part having a diameter larger than the diameter of the column, and formed in a cone shape gradually decreasing in diameter, and having a receiving part to accommodate grout material or concrete therein; It is configured to include; screw blades are installed in the form of a clausoid curve that gradually decreases the radius of curvature along the lower outer peripheral surface of the cone foundation.

At this time, one side is connected to the lower portion of the pillar, the other side is characterized in that it is further provided with a deformation preventing member is fixed to the side wall surface of the cone foundation.

In addition, a hole is formed on one side of the deformation preventing member.

In addition, the screw blade is characterized in that it is configured to be detachably inserted into the outer peripheral surface of the base cone.

In addition, the screw blade is produced by cutting the iron plate in the form of a distorted closoid circle in the form of a clausoid curve in which the radius of curvature gradually decreases, and then cut the center portion at regular intervals from the outer circumferential surface, and then relax it up and down, or wire rope Bound to the top of the cone outside the cone base and then wound toward the top of the cone, or bent in the form of a pipe or steel rod gradually reduced in diameter in the form of a snail and formed by installing it outside the cone in the form of It features.

According to the present invention, unlike the conventional method of artificially excavating the ground and placing concrete to install and then backfill the ground, the enlarged foundation of the present invention having a screw blade in the form of a clausoid is directly grounded by self drilling. Excavation is placed on a predetermined high-quality ground and then filled with grout or concrete, such as cement mortar, inside the cone-shaped foundation, or by forming and inserting the cone foundation in the form of cones and columns using grout or concrete beforehand. By installing the foundation much more easily than the conventional method to prevent the occurrence of loosening or displacement of the adjacent ground or structure due to the excavation, the process of excavation and backfill is omitted to provide an economical and easy construction device.

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.

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 an exploded perspective view showing an example of an extended tip support base construction apparatus having a screw blade 300 of the clasoid form of the present invention, the tubular column 100 having an internal hollow is installed on the top , The cone foundation 200 is installed in the lower portion of the pillar 100, the upper portion of the cone foundation 200 has a diameter larger than the diameter of the pillar 100 and is formed in a cone shape that gradually decreases in diameter as it goes down. Receiving portion 210 is formed to accommodate the grout material or concrete therein.

In addition, the screw blade 300 is installed in the form of a clausoid curve that gradually decreases the radius of the curve along the lower outer peripheral surface of the cone foundation (200).

The expanded tip support base construction device of the present invention configured as described above is constructed as shown in FIGS. 4 to 9.

4 and 5 show a state in which the extended tip support base construction apparatus of the present invention is applied to the enlarged foundation, Figures 6 to 9 shows a state applied to the pile foundation.

Here, referring to Figures 4 to 9, the lower side and one side of the pillar 100 is connected, the other side is located in the receiving portion 210 of the cone base 200, in particular fixed to the side wall surface of the cone base 200 It can be seen that the deformation preventing member 110 is installed.

The reason for installing the deformation preventing member 110 is to excavate only when the pillar 100 and the cone base 200 are fixed to each other when digging the lower ground by rotating and pressing the construction apparatus of the present invention. In particular, when the grout material or concrete is injected into the receiving portion 210 of the pillar 100 and the cone base 200 is to allow the pillar 100 to be located on the central axis of the cone base 200. .

The method of fixing the deformation preventing member 110 to the pillar 100 and the cone foundation 200 may be performed by welding or bolting.

The deformation preventing member 110 may be applied to a variety of forms, such as-shaped, + shaped.

In addition, the deformation preventing member 110 may be configured to allow a smooth dispersion discharge of the grout material or concrete by installing the hole 111 as shown.

Meanwhile, referring to FIGS. 6 to 7, the grouting hose 400 is installed on the side of the pillar 100 and the upper portion of the deformation preventing member 110, and the grouting hose 400 includes a plurality of hose holes 410. ) Was installed to disperse and grout the grout material or concrete through the distributed hose hole 410.

The grouting hose 400 may be selectively applied and used when injecting grout material or concrete into the receiving portion 210 of the pillar 100 and the cone foundation 200.

8 to 9, the grouting hose 400 is disposed in the inner side of the pillar 100 and the deformation preventing member 110, and the grouting material or concrete is configured to be more dispersed and discharged.

On the other hand, Figure 10 shows an embodiment of a screw blade 300, which is one of the important components in the present invention.

First, FIGS. 10A and 10B are cut in the form of a distorted closoid circle in the form of a clausoid curve in which a radius of curvature gradually decreases using an iron plate, and then the center portion includes an outer portion having a smaller radius of curvature. Removed in the form of the same type of clausoid circle and cut one side and then relaxed up and down to show the iron plate-shaped screw wing 300 produced.

In addition, (C) of Figure 10 shows a steel snail-type screw blades 300 to bend the pipe or steel rod in the form of a snail shape gradually decrease in diameter to install it in the form of a closoid outside the cone.

In addition, Figure 10 (D) shows the wire rope screw blade 300 made by binding the wire rope to the cone end on the outside of the cone base 200, and then properly wound toward the top of the cone.

As described above, the screw blades 300 installed in various conventional drilling equipments are differentiated from being completely fixed or integrally formed on the shaft member. In the case of the conventional drilling equipments, the screw blades 300 are If broken, the equipment had to be replaced with the shaft.

On the other hand, the screw blade 300 of the present invention as described above can be simply inserted into the cone foundation 200, and can be removed, so that if the screw blade 300 is broken, it is simply installed to easily insert the conventional screw It can be installed much more conveniently than the wing 300, has the advantage of reducing the cost of the drilling equipment.

In particular, by using the property that the diameter gradually increases from the end of the cone toward the top of the cone by using the clausoid curve, it can be easily installed without any other binding means, and when the ground is excavated for foundation installation, it is naturally bound to the outside of the cone. There is a characteristic that the screw blade 300 is formed.

11 shows that the screw blade 300 of the present invention specifically forms a clausoid curve, which is drawn when the point where the continuous screw blade 300 is located on the outside of the cone-shaped cone base is drawn. The curve draws a Closoid curve with the curve radius decreasing towards the tip of the cone.

In the present invention configured as described above, the column 100 or the cone base 200 is preferably formed of steel (steel) or FRP material.

When the expanded tip support base is constructed using the expanded tip support base construction device of the present invention having the above configuration, it has the effect of increasing the bearing capacity as follows.

For example, as shown in Figs. 4, 5 and 6, 7, increasing the tip cross-sectional area of the column 100 or the pile tip increases the tip bearing capacity. ,

In general, if the foundation is located on the high-quality ground, the allowable bearing capacity per unit area increases in proportion to the size of the foundation width B, so that the larger the width B is, the more favorable it is. The larger the cross-sectional area A of the foundation is, the smaller the working pressure q is. 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.

As a result of the above examination, the upper diameter of the cone base 200 is most preferably formed to be 2 to 5 times larger than the diameter of the pillar 100 so as to secure a sufficient cross section.

In the expanded tip support base construction device of the present invention as described above, only one pillar 100 is not installed, and a plurality of pillars 100 may be selectively installed as shown in FIG. 12.

In addition, in the case of a nearby structure or a place where ground loosening is a problem, it was difficult to install the expansion foundation by the conventional method, it can be easily installed expansion foundation without the work of ground excavation or backfilling, pile In the case of foundations, the tip area that meets the solid ground increases the tip bearing capacity of the piles, thereby reducing the number of pile foundations installed by the existing method, which enables economic construction, as well as securing structural strength. Therefore, it will be possible to secure the bearing capacity more reliably in the design.

The expanded tip support base construction device having a screw blade in the form of clathoid of the present invention will be easily used in small diameter piles or slope activity restraint pile methods, and restraint construction methods for stabilizing 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 an exploded perspective view showing an expanded tip support base construction device having a screw blade of the clasoid form of the present invention.

Figure 4 is a perspective view of the expansion tip support pile applied to the construction device of the present invention in the form of a cone and a pipe coupled to the pile foundation.

Figure 5 is a perspective view of the expansion tip support pile applied to the construction device of the pile foundation in the form of a cone.

6 to 9 is a perspective view showing a state installed by applying the factory factory of Figures 4 and 5 of the present invention to the pile foundation.

10 is a perspective view showing an embodiment of a screw blade in the present invention.

Figure 11 is a perspective view showing that the screw blades form a clausoid curve in the present invention.

12 is a perspective view showing a state in which a plurality of pillars are installed in the present invention.

<Detailed Description of Major Symbols in Drawing>

100: pillar 110: deformation preventing member

111 Hall 200 Cone Foundation

210: accommodating part 300: screw wing

400: mixed stirring 400: hose

410: hose hole

Claims (7)

In the device for constructing an extended tip support base through rotation and indentation, A tubular column (100) having an empty interior; 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 and is formed in the shape of a cone gradually decreases in diameter as it goes to the bottom and the receiving portion 210 to accommodate the grout material or concrete therein Cone base 200 having; Consists of, including; screw blade 300 is installed in the form of a clausoid curve that gradually decreases the radius of the curve along the lower outer peripheral surface of the cone foundation (200), One side is further connected to the lower portion of the pillar 100, the other side is further provided with a deformation preventing member 110 is fixed to the side wall surface of the cone foundation 200, A plurality of holes 111 are formed in the deformation preventing member 110, The screw blade 300 is characterized in that it is configured to be detachably inserted into the outer peripheral surface of the lower cone base 200, An extended tip support base construction device having a screw blade in the form of a clausoid. delete delete delete The method of claim 1, The screw blade 300 is produced by cutting the iron plate in the form of a distorted closoid circle in the form of a clausoid curve in which the radius of curvature gradually decreases, and then cut the center portion at regular intervals with the outer circumferential surface and then relaxes it up and down. Characterized by An extended tip support base construction device having a screw blade in the form of a clausoid. The method of claim 1, The screw blade 300 is characterized in that the wire rope is bound to the cone end on the outside of the cone base (200) and then wound toward the top of the cone formed, An extended tip support base construction device having a screw blade in the form of a clausoid. The method of claim 1, The screw wing 300 is formed by bending the pipe or steel rod in the form of a snail shape gradually decreases in diameter to install it in the form of a clausoid outside the cone, An extended tip support base construction device having a screw blade in the form of a clausoid.

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