WO2015174740A1

WO2015174740A1 - Front-end-enlargeable pile, and method for constructing same

Info

Publication number: WO2015174740A1
Application number: PCT/KR2015/004815
Authority: WO
Inventors: 임성대
Original assignee: (주)삼일이엔씨
Priority date: 2014-05-14
Filing date: 2015-05-13
Publication date: 2015-11-19

Abstract

The present invention relates to a front-end-enlargeable pile and a method for constructing same, the front-end-enlargeable pile being capable of forming an enlarged pile part while swiftly cutting in a diameter-enlarging manner the ground around the front end of the pile in various strata by using simple equipment without a separate hole-enlarging drill, thereby significantly increasing the allowable bearing capacity of the pile. The front-end-enlargeable pile according to the present invention comprises: a main pile body; and a diameter-enlarging implement, which is coupled to the bottom of the main pile body, and the diameter of which is enlarged by a pressurizing member as the diameter-enlarging implement is rotated with the rotation of the main pile body, wherein the diameter-enlarging implement comprises: a base member; a guide tube, which integrally protrudes from the central upper surface of the base member, and the upper part of which is open so that the pressurizing member can enter therefrom, and which has a plurality of entry/exit holes formed on the outer circumferential surface thereof; a coupling member for fixing/coupling the guide tube inside the main pile body; and an enlarging member comprising blades, which are provided between the base member and the bottom of the main pile body and have cutting implements formed on the outer sides thereof, and pressurizing parts, which are provided at the rear ends of the blades, have one end positioned inside the guide tube through the entry/exit holes of the guide tube, and slide outside the guide tube by the pressurization of the pressurizing member, thereby enlarging the blades outward.

Description

Tip-extended pile and its construction method

The present invention by using a simple equipment without a separate drill drill to expand the pile ground at the same time quickly by cutting the piling ground in various geometries at the same time to form a pile expansion, the tip expansion type pile and its construction method that can greatly increase the allowable bearing capacity of the pile It is about.

The pile is to support the load of the upper structure, the process of forming a hole in the ground must be preceded for the pile construction.

The drilling hole may adopt a variety of construction methods according to the ground conditions or pile diameter, and the deviation of air and construction cost is very large depending on which construction method is adopted.

In general, the pile supports the structure by the tip support force and the main frictional force, in order to secure a sufficient support force of the pile may be considered to increase the tip support force through the expansion of the pile tip.

In order to extend the conventional tip end portion, it is necessary to proceed vertical drilling to the rock layer with a direct drilling drill and expand the tip of the drilling hole with a separate expansion drill. After that, the remaining slime at the tip of the drilled hole should be removed, and the relaxation of the hollow wall of the enlarged hole should be stabilized, and concrete should be poured into the pile expansion space to form the concrete reinforcement part.

However, this conventional technology has a lot of input of the equipment used, not only the amount of drilling more than necessary, but also had a disadvantage in that it is difficult to prevent the wall of the enlarged hole from being relaxed or collapsed. In addition, since the slime and the groundwater coexist in the pile enlargement space, it is difficult to guarantee the excellent quality of the concrete.

On the other hand, by combining the reinforcement plate of the outer diameter larger than the concrete column so that one end of the PC steel wire penetrates the bottom of the concrete pillar, there is a technology for the PHC pile integrated with the reinforcement plate to extend the tip of the pile itself (Registration 10-1150854). number).

However, since the registered patent has a reinforcing plate attached to the bottom of the pile, the tip of the pile itself is already enlarged, so the expanded diameter of the pile tip is difficult to be larger than the diameter of the hole. In addition, it is difficult to apply in the hard ground, and when forming the whole hole with the increased diameter of the pile tip, except for the pile tip is excessively perforated to cause a large increase in air and construction costs.

In this regard, a technique for partially expanding the tip of the pile by using a ground drilling drill capable of vertical drilling and drill hole expansion in stages having the same diameter as the drill body has been proposed (Publication Patent No. 10-2013-0057161).

However, when the ground is excavated using the technique of the above patent, it takes a long time and has a disadvantage that it is difficult to proceed in a place where equipment is large and narrow.

The present invention by using a simple equipment without a separate drill drill to expand the pile piling ground at the same time and quickly to form a pile expansion, to increase the permissible bearing capacity of the pile, and the construction method thereof To provide.

The present invention is to provide a tip expansion type pile and its construction method which is excellent in economic efficiency and quick construction with minimal diameter cutting by a solid expansion body equipped with a cutting tip on the outside diameter-cutting the ground.

The present invention is to provide a tip expansion-type pile and its construction method that can be prevented from being relaxed or collapsed by the expansion of the pile at the same time the diameter expansion cutting.

The present invention is to provide a tip expansion type pile and a construction method thereof that can form a pile expansion with a simpler configuration.

The present invention according to a preferred embodiment relates to a front end expansion type pile consisting of a diameter expansion by the pressurized body while being coupled to the pile body, the lower portion of the pile main body is rotated with the rotation of the pile body, A base member; A guide tube which is integrally formed on the upper surface of the center of the base member so that the upper part is opened to allow the press body to enter from the upper part and a plurality of entrance holes are formed on the outer circumferential surface; A coupling member fixedly coupling the guide tube to the pile body; And a base provided between the base member and the lower portion of the pile main body, and a wing having a cutting tool formed at an outer side thereof, and a rear end of the wing unit, one end of which penetrates the entrance hole of the guide tube and is positioned in the guide tube. An expansion body consisting of a pressing portion for extending the wing portion by sliding the outside of the guide tube by the outside; Provides a front end expandable pile, characterized in that consisting of.

According to another preferred embodiment of the present invention, the coupling member provides a front end-type pile, characterized in that a plurality of partition members connecting the inner surface of the pile body and the guide tube.

According to another exemplary embodiment of the present invention, the pile body is provided with a front end expandable pile, which is divided into a lower member to which an enlarged orifice is coupled and an upper member to be coupled to an upper portion of the lower member.

According to another preferred embodiment of the present invention, a stepped portion is formed inside the upper end of the lower member to provide an extended end-type pile, characterized in that the lower end of the upper member is coupled to be seated on the stepped portion.

In accordance with another aspect of the present invention, a screw thread is formed on a lower outer circumferential surface of the upper member, and a female thread is formed on a side inner circumferential surface of the stepped portion of the lower member so that the upper member and the lower member are screwed together. To provide.

According to another preferred embodiment of the present invention, the coupling member is formed to protrude on the outer circumferential surface of the guide tube, and a thread is formed on the outer circumferential surface, thereby providing a tip-extended pile, which is screwed to a female thread formed on the inner circumferential surface of the pile body.

According to another preferred embodiment of the present invention, the coupling member protrudes on the outer circumferential surface of the guide tube and contacts the inner circumferential surface of the pile body, and provides a tip-expanded pile that is coupled to the pile body by a fastening member outside the pile body.

According to another exemplary embodiment of the present invention, the partition member is provided at the position of each expansion body, and the lower end of the partition member protrudes a predetermined length to the bottom of the pile body, and the lower end of the partition member is inserted into the upper surface of the expansion body. Expanded guide portion which is a groove portion to be provided in the front expansion type pile, characterized in that formed in the expansion direction of the expansion body.

According to another exemplary embodiment of the present invention, a plurality of guide rails, which are protrusions or grooves, are formed at a lower end of the pile body, and a groove portion corresponding to the guide rail portion is engaged on an upper surface of the extension body. It provides a tip expansion type pile, characterized in that the expansion guide is formed as a protrusion.

In addition, the present invention according to a preferred embodiment relates to a front end expansion type pile consisting of a diameter expansion by the pressurized body while being rotated with the rotation of the pile body is coupled to the pile body, the pile main body, the expansion sphere is A base member; A guide tube which is integrally formed on the upper surface of the center of the base member so that the upper part is opened to allow the press body to enter from the upper part and a plurality of entrance holes are formed on the outer circumferential surface; An upper guide member coupled to an upper portion of the guide tube and having an upper through hole formed at a center thereof; And a wing portion having a cutting hole formed on the outside and a rear end portion of the wing portion provided between the base member and the upper guide member, one end of which penetrates the entrance hole of the guide tube and is located in the guide tube to pressurize the pressure body. An expansion body consisting of a pressing portion for extending the wing portion by sliding the outside of the guide tube by the outside; Provides a front end expandable pile, characterized in that consisting of.

According to another preferred embodiment of the present invention, the upper guide member is provided with a tip-extended pile, characterized in that the reinforcing member is fixed to the pile body and coupled to the pile body.

The present invention according to another preferred embodiment provides a tip-expanded pile, characterized in that a plurality of coupling holes are formed to be coupled to the end of the reinforcing member is inserted around the upper through hole of the upper guide member.

The present invention according to another preferred embodiment provides a tip-extended pile, characterized in that the gap between the upper guide member and the base member increases toward the outside.

According to another preferred embodiment of the present invention, the base member provides a front end-type pile, characterized in that the inclined surface is inclined upwardly outward.

According to another exemplary embodiment of the present invention, at least one or more of the lower surface of the upper guide member or the upper surface of the base member is provided with a guide rail portion that is a protrusion or groove in the expansion direction of the expansion body, and the guide rail portion of the expansion body. Corresponding site provides a tip-extended pile, characterized in that the expansion guide is formed in the groove or protrusion engaging the guide rail.

The present invention according to another preferred embodiment provides a tip-extended pile, characterized in that the lower surface is inclined so that the thickness of the wing portion of the expansion toward the outside.

According to another preferred embodiment of the present invention, the base member provides a tip-extended pile, characterized in that a plurality of support wings protruding outward of the base member is formed at the bottom of each extension to support the bottom of the extension. .

The present invention according to another preferred embodiment provides a tip-extended pile, characterized in that the thickness of the wing portion of the expansion toward the outside in the expansion direction becomes thicker.

According to another preferred embodiment of the present invention, the cutting tool provides a tip-extended pile, characterized in that the cutting tip or a water jet injection nozzle for spraying any one of high pressure water, flame or hot water.

According to another preferred embodiment of the present invention, the lower end of the base member is formed with a through-hole through which a press body penetrates, and the lower end of the base member is characterized in that the conical inlet is reduced in diameter toward the lower portion thereof. To provide.

According to another exemplary embodiment of the present invention, an injection hole is formed at a lower end of the conical penetration part, and a stopper is formed in the injection hole to selectively close the injection hole, and the injection hole has a stepped portion formed at the lower part of the injection hole. The guide rod is inserted into the injection hole and is formed at the lower end of the guide rod provides a tip-extended pile, characterized in that consisting of the engaging portion is caught in the stepped portion is expanded diameter.

According to another preferred embodiment of the present invention, the conical penetration provides a front-end expansion pile, characterized in that coupled to the base member to be separated from the base member by the pressure inside the expansion sphere.

The present invention according to another preferred embodiment is fitted into the lower through-hole of the base member in the upper end of the conical inlet is formed in the fitting portion formed with a cutout at a position corresponding to the entrance hole of the guide tube, the outside of the lower portion of the fitting It provides a front end-type pile, characterized in that the stopper portion is formed on the lower surface of the base member.

The present invention according to another preferred embodiment provides a front-end expansion type pile, characterized in that the outer diameter before expansion of the expansion sphere is larger than the outer diameter of the pile body.

In addition, the present invention according to a preferred embodiment relates to a method for constructing the tip expansion type pile, (a) forming a hole in the ground; (b) inserting a tip-expanded pile having an enlarged orifice coupled to the bottom of the pile body into a drilling hole; And (c) inserting a press body into the guide tube while rotating the enlarged sphere to press the end portion of the press unit so that the expander extends out of the enlarged sphere while cutting the ground. It provides a construction method of the tip expansion-type pile, characterized in that comprising a.

The present invention according to another preferred embodiment relates to a method for constructing the tip expansion type pile, (a) forming a hole in the ground; (b) inserting the enlarged orifice into the lower portion of the drilling hole; (c) inserting a press body into the guide tube while rotating the enlarged orifice to press the end of the press to allow the expander to extend out of the enlarged oral cavity while cutting the ground; And (d) pouring concrete on the enlarged sphere to form a cast-in-place pile; It provides a construction method of the tip expansion-type pile, characterized in that comprising a.

The present invention according to another preferred embodiment relates to a method for constructing the tip-expansion pile, (a) the expansion-expanded pile coupled to the bottom of the pile main body by any one of the type, press-fit or rotary penetration Inserting; And (b) inserting a press body into the guide tube while rotating the enlarged sphere to press the end portion of the press unit so that the expander extends out of the enlarged sphere while cutting the ground. It provides a construction method of the tip expansion-type pile, characterized in that comprising a.

According to the present invention has the following effects.

First, by expanding the diameter of the enlarged sphere coupled to the bottom of the pile body without a separate drill drill, it is possible to rapidly expand the pile tip ground in a variety of strata from the soil layer to the solid rock layer to form a pile enlargement. Accordingly, the allowable bearing capacity of the pile is greatly increased, thereby minimizing the number of piles and optimizing the drilling depth. Therefore, it can be widely applied to foundation piles of various construction and civil engineering structures with excellent economic efficiency.

Secondly, it is possible to locally drill only as much as the volume of the pile expansion part, so the ground drilling amount can be minimized. In addition, the horizontal radially expanding cutting tip can provide a pile enlargement cross section of the designed dimension without excessive cutting, thereby significantly increasing the bearing capacity and the pullout resistance with the minimum amount of cutting work and the minimum number of expansion bodies.

Third, since the hard continuous pile enlargement is constructed while the cutting tip coupled to the expander cuts the ground, the hollow wall of the enlarged hole does not relax or collapse during operation.

Fourth, the use of compact equipment enables efficient use of space.

Fifth, when the conical penetration portion is provided in the lower portion of the base member can prevent the lower slime from flowing into the enlarged sphere at the initial stage of pressurization, it is possible to increase the lower ground density by discharging the filling material through the injection hole after pressing.

Sixth, because the expansion body is a sliding guide between the lower end of the pile body and the base member, the configuration is simple and easy to manufacture and maintain.

Seventh, when the base member and the guide tube of the enlarged oral cavity is integrally formed and the upper guide member is manufactured and assembled separately, the lower corner plate of the PHC pile may be used as the upper guide member.

Eighth, when the inclined surface is inclined upward toward the outer side of the base member it is easy to penetrate during driving. In addition, when the lower surface is inclined so as to become thinner toward the outside of the wing portion of the expansion body can be prevented from falling off with an increase in cutting speed.

Ninth, when forming a support wing for supporting the lower portion of the expansion member in the base member, it is economical to save the amount of steel required for the manufacture of expansion balls.

Tenth, when the outer diameter before the expansion diameter of the enlarged diameter sphere is larger than the outer diameter of the pile body, a constant space is formed between the pile body and the surrounding ground, it is easy to increase the diameter work by the rotation of the pile body.

1 is a perspective view of the tip expansion type pile according to the present invention.

Figure 2 is a perspective view of a portion of the enlarged sphere showing an embodiment of the coupling member.

3 is a perspective view of a portion of the enlarged mouth showing other embodiments of the coupling member.

4 is a perspective view of a magnifying sphere showing before and after expansion of the expander;

5 is a view showing an embodiment of the present invention the front end-type pile consisting of a pile body separated into upper and lower members.

Figure 6 is a view showing another embodiment of the present invention the front end-type pile consisting of a pile body separated by upper and lower members.

7 and 8 are perspective views showing the coupling relationship between the pile body bottom and the expansion body.

9 is a perspective view showing another embodiment of the enlarged oral cavity.

10 is a cross-sectional perspective view of the present invention the front end-type pile equipped with a reinforcing member.

11 is a cross-sectional view showing a coupling relationship between the pile body lower end and the expansion body.

12 is a bottom perspective view of the expander formed with an extension guide.

Figure 13 is a perspective view of a magnifying glass provided with a support wing.

14 is a bottom perspective view of the expander in which the upper and lower surfaces of the wing are configured in parallel.

15 is a cross-sectional view showing a coupling relationship between the pile body lower end and the expansion body.

16 is a perspective view of an extension showing various embodiments of a cutting tip.

17 is a view showing the present invention the front end expansion pile equipped with a conical penetration.

18 is a longitudinal sectional view of the present invention, the tip expansion type pile showing a conical intrusion dropped by the pressure of the filler.

19 shows another embodiment of the conical penetration.

The tip expansion type pile of the present invention is composed of a diameter-expanded diameter by the pressure body while being coupled to the pile body, the pile body lower coupled to the pile body, the expansion sphere, the base member; A guide tube which is integrally formed on the upper surface of the center of the base member so that the upper part is opened to allow the press body to enter from the upper part and a plurality of entrance holes are formed on the outer circumferential surface; A coupling member fixedly coupling the guide tube to the pile body; And a base provided between the base member and the lower portion of the pile main body, and a wing having a cutting tool formed at an outer side thereof, and a rear end of the wing unit, one end of which penetrates the entrance hole of the guide tube and is positioned in the guide tube. An expansion body consisting of a pressing portion for extending the wing portion by sliding the outside of the guide tube by the outside; Characterized in that consists of.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

As shown in Figure 1, the tip expansion type pile of the present invention is coupled to the pile body 10, the lower portion of the pile body 10 is rotated with the rotation of the pile body 10, the diameter by the pressing body 30 It consists of an enlarged oral diameter (20).

The pile body 10 may be composed of a ready-made concrete pile or steel pipe pile, the expansion sphere 20 is rotatable in accordance with the rotation of the pile body (10). In this case, with the rotation of the pile body 10, the expansion body 24 of the enlarged orifice 20 expands radially to form a pile expansion portion.

In addition, the pile body 10 may be configured as a cast-in-place pile. In this case, the diameter of the ground is cut by rotating only the diameter sphere 20 separately from the pile body 10 first, and then the pile body 10 is installed later.

The enlarged diameter hole 20 is a portion for rapidly forming a pile enlarged portion having a diameter larger than that of the pile body 10 at the tip of the pile without an additional drilling drill, the base member 21, the guide tube 22, and the coupling member ( 23) and the expansion body 24 is comprised.

The base member 21 is located on the bottom surface of the enlarged oral cavity 20, and as shown in (b) of FIG. 10 to be described later, a lower portion through which the press body 30 penetrates in the center of the base member 21 will be described. A ball 214 can be formed.

The base member 21 and the pile body 10 guide the horizontal expansion of the expansion body 24 provided therebetween.

The guide tube 22 is formed to protrude integrally on the upper surface of the center of the base member 21, the upper portion is opened so that the press body 30 can enter from the upper portion, and a plurality of entrance holes 221 are formed on the outer circumferential surface.

The guide tube 22 is fixedly coupled to the inside of the pile body 10 by the coupling member (23). Various embodiments of the coupling member 23 will be described with reference to FIGS. 2 and 3.

The expansion body 24 is provided between the base member 21 and the lower portion of the pile body 10, and is composed of a wing part 241 and a pressing part 243.

The wing 241 and the pressing portion 243 may be integrally or separated from each other, a plurality of expansion bodies 24 may be provided.

The wing 241 is formed with a cutting tool 242 for diameter-cutting the ground on the outside.

The pressurizing portion 243 is provided at the rear end of the wing portion 241, and one end thereof passes through the entrance and exit hole 221 of the guide tube 22 and is positioned in the guide tube 22. The wing part 241 is expanded to the outside by slidingly moving out of the guide pipe 22 by pressurization.

Therefore, when the pressurizer 30 presses the pressurizing portion 243 inside the guide tube 22, the pressurizing portion 243 slides out of the guide tube 22 through the entrance hole 221. Accordingly, since the wing portion 241 positioned at the front end of the pressing portion 243 extends together between the upper surface of the base member 21 and the lower end of the pile body 10, the expansion body 24 extends outside the pile body 10. Protrudes to enlarge the diameter of the enlarged sphere (20).

The expansion body 24 serves as a permanent reinforcement of the pile expansion portion in the expanded state after completion of the pile construction.

As a result, the allowable bearing capacity of the pile is greatly increased by securing the tip bearing capacity, and thus economical construction is possible by minimizing the number of piles and optimizing the drilling depth. In addition, it is possible to minimize the amount of ground perforation since it locally expands and drills only the volume of the pile expansion part. Therefore, it can be widely applied to foundation piles of various construction and civil engineering structures with excellent economic efficiency.

The expansion body 24 may diameter-cut the ground by using the pressing force caused by the hit or vibration of the pressing body 30 and the rotational force of the pile body 10. Therefore, the ground cutting speed is high, and the ground can be cut in various layers from the soil layer to the rock layer.

As can be seen in (a) to (b) of Figure 2, the coupling member 23 may be composed of a plurality of partition members connecting the inner surface of the pile body 10 and the outer surface of the guide tube 22.

In this case, the pile body 10 is composed of a steel pipe pile.

The partition member may be disposed in a vertical direction as in FIG. 2A or in a horizontal direction as in FIG. 2B.

The partition member has an inner end integrally coupled to the guide tube 22, and the outer end may be welded to the inner surface of the pile body 10 to couple the pile body 10 to the guide tube 22.

The partition member should be coupled to a position not interfere with the entrance hole 221 formed in the guide tube 22. In the embodiment of FIG. 2, the entrance hole 221 is disposed between the partition member and the base member 21.

As can be seen in Figure 3 (a), the coupling member 23 is formed to protrude on the outer peripheral surface of the guide tube 22, the screw thread 231 is formed on the outer peripheral surface, female thread formed on the inner peripheral surface of the pile body 10 It can be configured to be screwed on.

Therefore, the screw body 231 of the outer peripheral surface of the coupling member 23 and the female thread of the inner circumferential surface of the pile body 10 may be screwed to couple the pile body 10 to the guide tube 22.

In this case, unlike the embodiment of FIG. 2, the welding operation can be omitted, thereby eliminating defects due to welding and ensuring the safety of the operator.

In addition, as can be seen in Figure 3 (b), the coupling member 23 is formed to protrude on the outer peripheral surface of the guide tube 22 in contact with the inner circumferential surface of the pile body 10, the fastening member from the outside of the pile body 10 It is also possible to be configured to be coupled to the pile body (10) by.

As an example of the fastening member, a bolt B may be used.

In this case, the pile body 10 has a through-hole formed so that the bolt (B) can penetrate, the outer peripheral surface of the coupling member 23 is a bolt hole formed with a screw thread on the inner peripheral surface so that one end of the bolt (B) can be inserted To form (H).

4 is a perspective view of the enlarged oral cavity showing before and after expansion of the expander.

When the coupling member 23 is a partition member as shown in FIG. 2, the partition member is provided at a position of each expansion body 24, and a lower end of the partition member protrudes a predetermined length below the pile body 10. An expansion guide part 244, which is a groove part into which the lower end of the partition member is inserted, may be formed in the expansion direction of the expansion body 24 on the upper surface of the expansion body 24.

4 (a) and 4 (b) show the enlarged diameter spheres 20 before and after expansion of the expander 24, respectively.

As shown in (a) and (b) of FIG. 4, when the lower end of the partition member extends downward to the portion of the extension guide portion 244 of the expansion member 24, the expansion member 24 may support the partition member. Sliding along, the sliding direction is guided stably.

5 is a view showing an embodiment of the present invention the front-end expansion stake consisting of a pile body separated into upper and lower members.

As can be seen in Figures 5 and 6, the pile body 10 is divided into a lower member 11 to which the enlarged sphere 20 is coupled and an upper member 12 to be coupled to the upper portion of the lower member (11). Can be.

2, when the coupling member 23 is a partition member, an outer end of the partition member must be welded to the inside of the pile body 10.

Therefore, when the pile body 10 is divided into the upper member 12 and the lower member 11, the partition member is welded to the inside of the lower member 11, and then the lower member 11 and the upper member 12 can be combined. have.

As can be seen in the cross-sectional view shown in Figure 5 (b), the upper member 12 and the lower member 11 can also be welded (W) coupled.

Figure 6 is a view showing another embodiment of the present invention the front end-type pile consisting of a pile body separated into upper and lower members.

As shown in Figure 6, the upper end of the lower member 11 is formed with a stepped portion 111 may be coupled so that the lower end of the upper member 12 is seated on the stepped portion (111).

The stepped portion 111 stably couples the upper member 12 to the upper portion of the lower member 11.

The vertical load of the upper member 12 is smoothly transmitted to the lower member 11 by the stepped portion 111.

In addition, a thread 121 is formed on a lower outer circumferential surface of the upper member 12, and a female thread 112 is formed on an inner circumferential surface of the side surface of the stepped portion 111 of the lower member 11 to form an upper member 12 and a lower member. 11 can be screwed.

In this case, since the upper member 12 and the lower member 11 are simply screwed together, as in the cross-sectional view shown in FIG. 6 (b), problems such as welding defects or deformation due to welding coupling do not occur.

7 and 8 are perspective views showing the coupling relationship between the lower end of the pile body and the expansion body.

A plurality of

guide rails

13 and 14, which are protrusions or grooves, are formed in the lower end of the pile body 10 in the extending direction of the expansion body 24, and the guide rail portion is formed on an upper surface of the expansion body 24. 13 and 14, extension guide

parts

244 and 245 which are grooves or protrusions engaged with each other may be formed.

Therefore, as shown in FIG. 7, the guide rail portion 13, which is a protrusion of the lower end of the pile body 10, is inserted into the expansion guide portion 244, which is a groove formed on the upper surface of the expansion body 24, thereby sliding the expansion body 24. You can guide the direction.

Alternatively, as shown in FIG. 8, the expansion guide part 245, which is a protrusion formed on the upper surface of the expansion body 24, and the guide rail part 14, which is a groove part of the lower end of the pile body 10, are engaged with each other to slide in the expansion body 24. Can guide.

9 is a perspective view showing another embodiment of the enlarged oral cavity.

The tip expansion type pile of the present invention is coupled to the pile body 10, the pile body 10, the lower diameter sphere 20 is expanded by the pressure body 30 while being rotated with the rotation of the pile body (10) To be configured, the enlarged sphere (20), the base member 21; A guide tube 22 which is formed to protrude integrally with the center upper surface of the base member 21 so that the upper part is opened so that the press body 30 can enter from the upper part and a plurality of entrance holes 221 are formed on the outer circumferential surface thereof; An upper guide member 25 having an upper through hole 251 formed at the center thereof to be coupled to the upper portion of the guide tube 22; And a wing portion 241 formed between the base member 21 and the upper guide member 25 at a rear end of the wing portion 241 and the wing portion 241 having a cutting tool 242 formed thereon. Pressing through the entrance and exit hole 221 of the 22 to be located in the guide tube 22 to slide the outside of the guide tube 22 by the pressure of the pressing body 30 to expand the wing portion 241 to the outside An expansion body 24 composed of a portion 243; Characterized in that consists of.

In this case, the tip expansion type pile is different from the tip expansion type pile shown in FIG. 1, and as shown in FIG. 9, the enlarged diameter hole 20 has a base member 21, a guide tube 22, an upper guide member 25, and an expansion body. It consists of 24.

The guide tube 22 may be inserted into an upper through hole 251 of the upper guide member 25 so that a stepped portion may be formed at an upper end thereof to support the upper guide member 25.

The guide tube 22 and the upper guide member 25 may be screwed or welded.

In particular, in the case of screw coupling, it is possible to form a screw thread in a shape corresponding to each other on the inner side of the upper through hole 251 of the upper guide member 25 and the upper outer surface of the guide tube 22 and screw them together.

For the convenience of production, the base member 21 and the guide tube 22 may be integrally formed by injection or 3D printer, or the like and may be manufactured by assembling the upper guide member 25 separately.

In the case of PHS pile (prestressed high-strength concrete pile), which is a high-strength prestressed concrete pile produced by a centrifugal molding method, the lower sheet may be used as the upper guide member 25.

9 and other expansion and role of each configuration is the same as that described in FIG. same.

10 is a cross-sectional perspective view of the present invention the front end type pile equipped with a reinforcing member.

As can be seen in Figure 10 (b), the upper guide member 25 may be coupled to the reinforcing member 26 is fixed in the pile body 10 is coupled to the pile body 10.

The reinforcing member 26 may act as a tension material for applying prestress to the pile body 10 in the PHC pile, it may be configured as a steel wire or steel bar.

In this case, the upper guide member 25 may serve as a tip reinforcing plate of the pile body 10.

The reinforcing member 26 may be provided in plural along the outer circumferential surface of the guide tube 22.

As can be seen in Figure 10 (a), around the upper through hole 251 of the upper guide member 25 a plurality of coupling holes 252 is inserted into the end of the reinforcing member 26 is coupled Can be formed.

Therefore, the lower end of the reinforcing member 26 is coupled to the upper guide member 25 through the coupling hole 252 and the upper end of the reinforcing member 26 is positioned in the pile body 10.

At this time, as can be seen in Figure 10 (b) and 11, the bottom of the reinforcing member 26 to form an enlarged head portion, the coupling hole 252 is the insertion hole and the reinforcing member 26 is inserted into the head portion ) To move horizontally to form a shape in which the fixing hole to which the head is locked is connected.

As described above, since the base member 21 and the upper guide member 25 can be manufactured separately, the coupling hole 252 can be easily drilled into the upper guide member 25.

It is sectional drawing which shows the coupling relationship between the pile body lower end and an expansion body.

The gap between the upper guide member 25 and the base member 21 may be configured to increase toward the outside.

That is, when it is configured to be t ₁ <t ₂ as can be seen in Figure 11, the base member 21, the wing portion 241 of the expansion body 24 is received toward the end side of the upper guide member 25 Since there is room in the space between the upper guide member 25, the expansion body 24 can be easily extended outward.

In addition, the base member 21 may have an inclined surface 211 having a lower surface inclined upward.

Since the lower soil is pushed to the periphery by the inclined surface 211, it is easy to penetrate into the ground.

The inclined surface 211 can be formed in both the front end-type stake including the expansion sphere shown in FIG.

12 is a bottom perspective view of the expander formed with an extension guide.

9 and 12, at least one of the lower surface of the upper guide member 25 or the upper surface of the base member 21 may be a guide rail portion that is a protrusion or groove in the expansion direction of the expansion body 24. 212 is formed, and an extension guide part 246 which is a groove part or a protrusion which is engaged with the guide rail part 212 may be formed at a portion corresponding to the guide rail part 212 of the extension body 24. have.

The tip expansion type pile is expanded while the expansion sphere 20 is rotated while the wing portion 241 of the expansion body 24 cuts the surrounding ground, so the expansion body 24 rotates in the opposite direction of rotation by the resistance of the surrounding ground. The ground may not be expanded properly.

However, when the guide rail portion 212 and the expansion guide portion 246 is configured to engage with each other as described above, the expansion body 24 forms a straight line in the expansion direction of the pile outer peripheral surface Since it expands, the extension direction of the expansion body 24 can be guided stably.

In FIG. 9, a guide rail portion 212 having a groove shape formed on an upper surface of the base member 21 is illustrated, and in FIG. 12, an extension guide portion 246 having a protrusion shape formed on the bottom surface of the expander 24 is illustrated.

Of course, the guide rail portion 212 may be formed on the lower surface of the upper guide member 25, and the expansion guide portion 246 may be formed on the upper surface of the expansion body 24, and the upper surface and the upper guide member 25 of the base member 21 may be formed. It is also possible to form the guide rail portion 212 on the lower surface, respectively, and to form the extension guide portion 246 on the lower surface and the upper surface of the expansion body 24.

As shown in Figure 12, the wing portion 241 of the expansion body 24 may be configured to be inclined when the thickness becomes thinner toward the outside.

When the end of the wing 241 is thinned, the cutting speed may be increased during the expansion operation.

In addition, if there is no inclination on the lower surface of the wing portion 241 or is formed to be inclined downward toward the edge of the wing portion 241, the expansion body 24 is slid out by the impact or vibration of the base member 21 to escape. Can be.

However, if the end of the wing portion 241 is made thin, in particular, upwardly inclined toward the end of the wing portion 241, it is expanded by the blow or vibration of the base member 21 during the driving operation of the driving pile or the operation of the drilling pile. The sieve 24 can be prevented from falling out on its own.

The shape of the wing portion 241 as described above is applicable to both the tip expansion type pile including the expansion sphere shown in FIG.

FIG. 13 is a perspective view of an enlarged oral cavity having a support wing, and FIG. 14 is a bottom perspective view of the expander having parallel upper and lower wings, and FIG. 15 is a cross-sectional view illustrating a coupling relationship between the lower end of the pile body and the expander. .

As can be seen from (a) to (b) of Figure 13, the base member 21 of the base member 21 in the lower portion of each expansion body 24 to support the lower portion of the expansion body 24 A plurality of support wings 213 protruding outward may be formed.

That is, the base member 21 is provided only in the lower portion of the expansion body 24 without having a disc shape, and thus the amount of steel required for the enlarged diameter ball 20 can be saved.

In this case, the wing portion 241 of the expansion body 24 is configured to have a thick thickness of the support wing 213 in parallel up and down, as shown in Figure 14, to prevent the support wing 213 from being deformed upwards desirable.

The configuration of the support wing 213 can be applied to both the tip expansion type pile including the enlarged sphere shown in FIG.

As can be seen in Figure 15, when the support wing 213 is provided, the wing portion 241 of the expansion body 24 may be configured to become thicker toward the outside in the expansion direction.

Since the plurality of support wings 213 are separated from each other, the rigidity is weak. Thereby, the support wing 213 at the time of pile driving can be bent upward, making it difficult to expand the expansion body 24.

Therefore, when the wing portion 241 of the expansion body 24 is inclined such that t ₃ <t ₄ , the expansion body 24 can be easily extended outward even if the support blade 213 is deformed.

As shown in FIGS. 16A to 16B, the cutting tool 242 is a cutting tip 242a or a water jet injection nozzle 242b for spraying any one of high pressure water, flame or hot water. Can be configured.

The cutting tool 242 is to diameter-cut the ground, it can be configured as a cutting tip 242a as shown in Fig. 16 (a). The cutting tip 242a may be to cut the ground to the desired dimensions, it is possible to form a cross-section of the pile enlargement of the designed dimensions.

The cutting tool 242 may be configured as a water jet injection nozzle 242b as shown in (b) of FIG. 16, and may be configured to include both the cutting tip 242a and the water jet injection nozzle 242b. Do.

The water jet injection nozzle 242b receives jet of any one of high pressure water, flame or hot water from the supply line 40 as shown in FIGS. Cut.

Fig. 17 is a view showing the present invention front end expandable pile provided with conical penetrations, and Fig. 18 is a longitudinal cross-sectional view of the present invention the end extension type pile showing conical penetrations dropped by the filling material.

As shown in (b) and 17 of FIG. 10, a lower through hole 214 through which the press body 30 penetrates is formed at the center of the base member 21, and the base member 21 of the base member 21 is formed. The lower portion may be coupled to the conical intrusion 50 is reduced in diameter toward the lower portion.

The conical inlet 50 is coupled to communicate with the lower through-hole 214 in the center of the base member 21, the side and the bottom is made of a closed cone shape so that the pile can be easily entered into the ground.

The configuration of the conical penetration 50 is applicable to both the tip expansion type pile including the expansion sphere shown in FIG.

As shown in (a) to (c) of FIG. 17, an injection hole 51 is formed at a lower end of the conical penetration part 50, and an injection hole 51 is formed in the injection hole 51. A stopper 52 for selectively closing is provided, wherein the injection hole 51 has a stepped portion 511 formed at the bottom thereof, and the stopper 52 is a guide rod 521 inserted into the injection hole 51. And it is formed on the lower end of the guide rod 521 is characterized in that the diameter is configured to be composed of the engaging portion 522 to be caught on the stepped portion (511).

Accordingly, during pile penetration, the locking portion 522 of the stopper 52 is caught by the stepped portion 511 of the injection hole 51 to prevent the lower slime from flowing into the enlarged orifice 20 (FIG. 17 ( b)).

In addition, after the pile penetration, the filling material 60 is injected from the inside of the enlarged oral cavity 20 so that the stopper 52 moves to the outside by the pressure of the filling material 60 to open the injection hole 51 (FIG. 17C). )). Accordingly, since the filler 60 flows out through the injection hole 51, the ground density can be increased.

The conical penetration portion 50 may be fixedly coupled to the base member 21, but the base member 21 and the base member 21 to be separated from the base member 21 by the pressure in the enlarged diameter (20) as shown in FIG. Can be combined.

In the case of pressurizing the conical penetrating portion 50 with the filling material 60 or pressurizing member 30 in the enlarged diameter sphere 20, the conical penetrating portion 50 is separated from the base member 21.

Then, since the filler 60 is introduced into the separated lower ground into the separated gap, the density of the lower pile is increased to form a hard bulb.

19 is a view showing another embodiment of the conical intrusion.

As can be seen in Figure 19 (a) to (b), the top of the conical penetration portion 50 is fitted into the lower through hole 214 of the base member 21 of the guide tube 22 A fitting portion 53 having a cutout portion 531 is formed at a position corresponding to the entrance hole 221, and a stopper portion 54 formed on a lower surface of the base member 21 is formed at an outer side of the lower portion of the fitting portion 53. Can be.

When the fitting portion 53 is not present, if the pressure of the filling material 60 is not constant, the conical penetration part 50 may be separated from only one side, and the filling material 60 may be unevenly injected.

The fitting portion 53 serves to guide the conical penetration portion 50 and the conical penetration portion 50 to be stably separated while at the same time serves to couple the expansion hole (20).

The cutout 531 is a passage through which the pressurized portion 243 of the expander 24 is moved, and the cutout 531 is a filling material therein before the conical penetration 50 is completely separated from the enlarged oral cavity 20. Allow (60) to be injected early into the lower ground.

The stopper portion 54 prevents the conical penetration portion 50 from being pushed into the enlarged orifice 20 during penetration.

On the other hand, as can be seen in Figures 1, 11, 17, etc., the outer diameter before the diameter of the enlarged diameter sphere 20 can be configured to be larger than the outer diameter of the pile body (10).

There are two methods for the construction of the driving pile: a method of constructing the pile with the driving force from the beginning, and a method of drilling the pile through the upper buried layer or the gypsum layer, penetrating the pile to the middle layer, and injecting the pile to the support layer by driving the pile.

In general, when rotating the expansion sphere 20 by rotating the pile main body 10 in the driving pile, there is no space between the pile main body 10 and the surrounding ground to increase the pile depth 10 as the pile depth increases It is difficult.

In this case, when the outer diameter of the enlarged diameter sphere 20 is larger than the outer diameter of the pile main body 10, a space is formed between the outer circumferential surface of the pile main body 10 and the surrounding ground, so that the enlarged diameter work by the rotation of the pile main body 10 is easy. .

Next, look at the construction method of the tip expansion type pile of the present invention.

The tip-extended stake of the present invention may form the pile body 10 as a ready-made pile, or may be formed as a cast-in-place pile.

When the pile main body 10 is a ready-made pile, the construction method of the tip-extended pile of the present invention first (a) to form a drill hole in the ground, (b) the expansion diameter 20 is coupled to the bottom of the pile main body 10 The extended tip pile is inserted into the drilled hole.

In this case, the drilling hole may be formed by various methods such as boring or hitting.

Subsequently, (c) while inserting the press body 30 into the guide tube 22 while rotating the enlarged diameter hole 20 to press the end portion of the pressurized portion 243, the expander 24 cuts the ground, 20) to extend outside.

After expansion of the enlarged oral cavity 20, the pressing body 30 is recovered and the construction is completed by a process of filling the filling material in the empty space in the pile.

The construction method of the tip expansion-type pile can be applied to both the tip expansion-type pile including the expansion sphere shown in FIG.

In addition, when the pile body 10 is a cast-in-place pile, in the construction method of the tip expansion type pile of the present invention (a) first to form a hole in the ground, and (b) the expansion hole 20 is inserted into the lower hole installation The step is performed.

And (c) inserting the press body 30 into the guide tube 22 while rotating the enlarged diameter hole 20 to press the end portion of the pressurizing portion 243 so that the expander 24 cuts the ground and the enlarged diameter mouth 20 ) To expand outward.

Finally (d) the concrete is placed in the upper diameter sphere 20 to form a cast-in-place pile.

In the step (d) it is also possible to install reinforcing materials, such as reinforcing steel bars, FRP before concrete placement.

The construction method of the tip expansion-type pile is applicable to the tip expansion-type pile including the expansion sphere shown in FIG.

In addition, the construction method of the tip expansion type pile of the present invention (a) step of inserting the tip expansion type coupled to the expansion sphere 20 on the bottom of the pile body 10 by any one of the type, press-fit or rotary penetration ; And (b) inserting the press body 30 into the guide tube 22 while rotating the enlarged sphere 20 to press the end portion of the press unit 243 so that the expander 24 cuts the ground and the enlarged sphere 20 ) Extending outwardly; It may be configured to include.

The present invention can expand the diameter of the diameter of the expansion sphere coupled to the lower pile body without additional drill drill to form a pile expansion at the same time to rapidly cut the pile tip ground in a variety of strata from soil layer to solid rock layer, accordingly As the allowable bearing capacity of piles is greatly increased, it is possible to minimize the number of piles and to optimize the depth of excavation. Therefore, there is industrial applicability in that it can be widely applied to foundation piles of various construction and civil structures with excellent economic efficiency.

Claims

Regarding the tip main body 10, the tip expansion-type pile coupled to the lower portion of the pile main body 10 is composed of an enlarged diameter hole 20 is expanded by the pressure body 30 while being rotated with the rotation of the pile main body 10 In that,

The enlarged sphere 20, the base member 21; A guide tube 22 which is formed to protrude integrally with the center upper surface of the base member 21 so that the upper part is opened so that the press body 30 can enter from the upper part and a plurality of entrance holes 221 are formed on the outer circumferential surface thereof; A coupling member 23 fixedly coupling the guide tube 22 to the pile body 10; And

It is provided between the base member 21 and the lower portion of the pile main body 10 and is provided at the rear end of the wing portion 241 and the wing portion 241 formed with a cutting tool 242 on the outside of the guide tube 22. Pressing part which penetrates the entrance hole 221 of the inside) and is located in the guide pipe 22, and expands the wing part 241 to the outside by slidingly moving out of the guide pipe 22 by the pressurizing of the press body 30. An expander 24 composed of 243; Extended tip pile, characterized in that consisting of.
In claim 1,

The coupling member 23 is a front end expansion type pile, characterized in that a plurality of partition member connecting the inner surface of the pile body 10 and the guide tube 22.
In claim 2,

The pile body 10 is a front end expandable pile, characterized in that divided into a lower member (11) to which the expansion sphere 20 is coupled and the upper member (12) coupled to the upper portion of the lower member (11).
In claim 3,

The stepped portion 111 is formed inside the upper end of the lower member 11 so that the lower end of the upper member 12 is coupled to be seated on the stepped portion 111.
In claim 4,

A thread 121 is formed on a lower outer circumferential surface of the upper member 12, and a female thread 112 is formed on an inner circumferential surface of the side surface of the stepped portion 111 of the lower member 11 so that the upper member 12 and the lower member ( 11) Extended tip pile, characterized in that the screwed.
In claim 1,

The coupling member 23 is formed to protrude on the outer circumferential surface of the guide tube 22, the thread 231 is formed on the outer circumferential surface, characterized in that the screw screw is coupled to the female thread formed on the inner circumferential surface of the pile body (10).
In claim 1,

The coupling member 23 is formed on the outer circumferential surface of the guide tube 22 and is in contact with the inner circumferential surface of the pile body 10, and is coupled to the pile body 10 by a fastening member from the outside of the pile body 10. Expandable pile.
The method according to any one of claims 2 to 5,

The partition member is provided at the position of each expansion body 24, the lower end of the partition member protrudes a predetermined length to the lower portion of the pile body 10, the lower end of the partition member is inserted into the upper surface of the expansion body 24 An expansion guide part 244, which is a groove part, is formed in the direction of expansion of the expansion body 24.
The method according to any one of claims 1 to 7,

A plurality of guide rails 13 and 14, which are protrusions or grooves, are formed in the lower end of the pile body 10 in the extending direction of the expansion body 24, and the guide rail portion is formed on an upper surface of the expansion body 24. 13, 14 is a front end expansion type pile, characterized in that the expansion guide portion (244, 245) that is a groove or protrusion to be engaged.
Regarding the tip main body 10, the tip expansion-type pile coupled to the lower portion of the pile main body 10 is composed of an enlarged diameter hole 20 is expanded by the pressure body 30 while being rotated with the rotation of the pile main body 10 In that,

The enlarged sphere 20, the base member 21; A guide tube 22 which is formed to protrude integrally with the center upper surface of the base member 21 so that the upper part is opened so that the press body 30 can enter from the upper part and a plurality of entrance holes 221 are formed on the outer circumferential surface thereof; An upper guide member 25 having an upper through hole 251 formed at the center thereof to be coupled to the upper portion of the guide tube 22; And

It is provided between the base member 21 and the upper guide member 25 and is provided at the rear end of the wing portion 241 and the wing portion 241 is formed with a cutting tool 242 on the outside of the guide tube ( The pressurizing part which penetrates the entrance / exit hole 221 of 22 and is located in the guide pipe 22, and expands the wing part 241 to the outside by slidingly moving out of the guide pipe 22 by the pressurization of the press body 30. An expander 24 composed of 243; Extended tip pile, characterized in that consisting of.
In claim 10,

The upper guide member 25 is fixed to the pile main body 10 is a front end expansion type piling characterized in that the reinforcing member 26 is coupled to the pile main body 10 is coupled.
In claim 11,

Tip expansion type pile, characterized in that a plurality of coupling holes 252, the end of the reinforcing member 26 is inserted and coupled around the upper through hole 251 of the upper guide member 25 is formed.
In claim 10,

Tip expansion type pile, characterized in that the gap between the upper guide member 25 and the base member 21 increases toward the outside.
The method of claim 1 or 10,

The base member 21 is a front end-type stake, characterized in that the inclined surface 211 is inclined upwardly outward.
In claim 10,

At least one of the lower surface of the upper guide member 25 or the upper surface of the base member 21 is formed with a guide rail portion 212 that is a protrusion or groove in the expansion direction of the expansion body 24, the expansion body 24 At the portion corresponding to the guide rail portion 212 of the front end expansion type, characterized in that the expansion guide portion 246 that is a groove or protrusion engaging the guide rail portion 212 is formed.
The method of claim 1 or 10,

The wing portion 241 of the expansion body 24 is a front end-type stake, characterized in that the lower surface is inclined so as to become thinner toward the outside.
The method of claim 1 or 10,

The base member 21 of the base member 21 in the lower portion of each expansion body 24 to support the lower portion of the expansion body 24 Tip expansion type piling characterized in that a plurality of support wings 213 protruding outward is formed.
The method of claim 17,

The wing portion 241 of the expansion body 24 is a tip expansion type pile, characterized in that the thickness becomes thicker toward the outside in the expansion direction.
The method of claim 1 or 10,

The cutting tool 242 is a cutting tip (242a) or extended jet type nozzle characterized in that the water jet injection nozzle (242b) for spraying any one of high pressure water, flame or hot water.
The method of claim 1 or 10,

In the center of the base member 21 is formed a lower through hole 214 through which the press body 30 penetrates, and the lower portion of the base member 21 has a conical penetration 50 having a smaller diameter toward the lower portion. Tip expandable pile, characterized in that coupled.
The method of claim 20,

An injection hole 51 is formed through the lower end of the conical penetration part 50, and the injection hole 51 is provided with a stopper 52 for selectively closing the injection hole 51. ) Is formed in the lower step portion 511, the stopper 52 is formed in the guide rod 521 and the guide rod 521 is inserted into the injection hole 51 and the lower end diameter is expanded Tip expansion type pile, characterized in that consisting of the engaging portion 522 is caught on the stepped portion (511).
The method of claim 20,

The conical inlet 50 is the tip expansion type, characterized in that coupled to the base member 21 to be separated from the base member 21 by the pressure in the expansion sphere (20).
The method of claim 22,

The incision 531 is formed at a position corresponding to the entrance hole 221 of the guide tube 22 to be fitted into the lower through hole 214 of the base member 21 at the upper end of the conical penetration part 50. Tip portion 53 is formed, the front end expansion type pile, characterized in that the stopper portion 54 is formed on the lower side of the base portion (21) is formed on the lower side of the fitting portion (53).
The method of claim 1 or 10,

Expanded diameter outer diameter of the expansion sphere 20 is the tip expansion type pile, characterized in that larger than the outer diameter of the pile body (10).
It relates to a method of constructing the tip expansion type pile according to claim 1,

(a) forming a hole in the ground;

(b) inserting the tip-extended pile having the expansion diameter 20 coupled to the bottom of the pile body 10 into the drilling hole; And

(c) The diameter sphere 20 is inserted while the expansion body 24 cuts the ground by inserting the pressing body 30 into the guide tube 22 while rotating the enlarged diameter mouth 20 to press the end portion of the pressing portion 243. Allowing it to expand outwardly; Construction method of the distal end-type pile, characterized in that comprising a.
Regarding the method of constructing the tip expansion type pile according to claim 10,

(a) forming a hole in the ground;

(b) inserting and installing the enlarged diameter hole 20 under the drilled hole;

(c) The diameter sphere 20 is inserted while the expansion body 24 cuts the ground by inserting the pressing body 30 into the guide tube 22 while rotating the enlarged diameter mouth 20 to press the end portion of the pressing portion 243. Allowing it to expand outwardly; And

(d) placing concrete on top of the enlarged sphere 20 to form a cast-in-place pile; Construction method of the distal end-type pile, characterized in that comprising a.
It relates to a method of constructing the tip expansion type pile according to claim 1,

(a) inserting the tip-extended pile, in which the enlarged orifice 20 is coupled to the bottom of the pile body 10, into the ground by any one of type, press-fit or rotary penetration; And

(b) Inserting the press body 30 into the guide tube 22 while rotating the enlarged diameter hole 20 to press the end portion of the pressurizing portion 243 so that the expander 24 cuts the ground and the enlarged diameter hole 20 Allowing it to expand outwardly; Construction method of the distal end-type pile, characterized in that comprising a.