KR101229090B1 - Steel-concrete composite pile and method of construction thereof and piling method of complex pile using the same - Google Patents

Abstract

PURPOSE: A hybrid composite pile capable of increasing the axial strength and the flexural strength of a pile and facilitating pile cutting work, a manufacturing method thereof and a construction method thereof are provided to drastically increase the axial strength and the flexural strength of a pile, to reduce construction costs, and to improve economic efficiency by reducing the thickness of a steel pipe more greatly than when using only a steel pipe pile. CONSTITUTION: A hybrid composite pile(100) includes a steel pipe(110), a shoring plate(120), a pre-stressed concrete steel wire(130), and a concrete pipe(140). The shoring plate is fixed on the low end of the steel pipe. The pre-stressed concrete steel wire is pre-stressed by fixing the other end on the shoring plate. The concrete pipe is provided with a composite part(141), a transfer part(142), and an expansion pipe part(143). The composite part of which the pre-compression stress is introduced to the concrete positioned in the inside of a steel pipe by the tension of a pre-stressed concrete steel wire is composed. The transfer part is connected to the composite part to have the same outer diameter as the inner diameter of a steel pipe and composed for the pre-compression stress to be introduced to concrete. The expansion pipe part is connected with the transfer part, expanded to have the same diameter as the outer diameter of the pipe, and composed for one end of pre-stressed concrete steel wire to be mounted.

Description

Steel pile and method of construction pile and method of construction pile and method of composite pile using the same

The present invention relates to a composite pile, and more particularly, by using the tension force introduced into the PC steel wire while improving the restraining force on the composite portion of the concrete pipe by the steel pipe as well as the expansion portion and transition portion of the concrete pipe, as well as inside the steel pipe The precompression stress is applied to the composite section of the concrete pipe, and the spiral wire is placed inside or outside the PC steel wires located in the expansion and transition sections and the composite section of the concrete pipe to increase the confining effect of the concrete pipe. The present invention relates to a composite pile, a method of manufacturing the composite pile, and a method of embedding a composite pile using the same, which can increase axial strength, flexural strength, and ease the head clearance.

In general, a pile is constructed to stably transfer the weight of the structure to the support layer. The pile is classified into a concrete pile, a steel pipe pile, and a synthetic pile according to the material made.

The concrete pile refers to the RC pile, PC pile, PHC pile, etc., the net end area of the pile tip is large, the support capacity is large, and the material cost is only 1/3 to 1/5 of the steel pipe pile, which can reduce the construction cost. However, when the horizontal load is applied to the structure, concrete piles with a small resistance to shear and bending moments increase due to the large amount of shear and bending moments. There is an increasing problem.

The steel pipe pile has excellent resistance to bending moments and shear forces, as well as small unit weight and high strength, which is excellent in workability and easy to join and cut, so that the steel pipe pile can be constructed up to the required length in the field with severe stratum changes. Although there is an advantage of excellent field applicability, the material cost of steel pipe pile is expensive and the raw materials of steel materials are all imported, so the supply-demand and price changes are inevitably high. There is a problem that a large loss.

Recently, in order to solve the problems of the concrete piles and steel pipe piles, composite piles have been applied to the site by combining piles having heterogeneous materials or other characteristics to suit structural characteristics.

As a prior art of the synthetic pile has been disclosed a composite pile made of steel pipes and reinforced concrete and the manufacturing method through Japanese Patent Laid-Open No. 2012-057443.

As shown in FIG. 1, as disclosed in FIG. 1, a steel pipe concrete composite part 3 in which concrete is poured into a steel pipe 2, and a concrete part in which concrete is poured to be connected to the steel pipe concrete composite part 3, is disclosed. (4) is provided, and the steel pipe (2) concrete composite portion (3) and the tension pile (5) is built in the concrete portion (4) is composed of a composite pile (1) into which prestress is introduced.

However, the published patent, there is a problem that the prestress of the planned size is not introduced into the concrete of the steel pipe concrete composite part because the prestress introduced into the tension material due to the concrete covering the steel pipe cross section is not sufficiently transferred to the concrete placed in the steel pipe. That is, in order for the prestress to be introduced into the concrete of the steel pipe concrete composite part, the concrete inside the steel pipe must be compressed by a certain amount by the prestress introduced into the tension member. It is impossible to introduce prestresses of the planned size into concrete.

In addition, the published patent had a problem of high possibility of damage of the synthetic pile head when driving, because the reinforcing band is not installed on the concrete head of the synthetic pile, and when the composite pile and the PHC pile are jointed, the synthetic pile and the lower portion are It is difficult to match the central axis of the PHC pile has a problem that the work efficiency is reduced and the working time is long.

In view of the above-described conventional defects, the object of the present invention is to improve the restraining force on the composite portion of the concrete pipe by means of the steel pipe and to introduce the tension force to the PC steel wire, thereby expanding and transitioning the concrete pipe. In addition, the pre-compression stress is applied to the composite part of the concrete pipe located inside the steel pipe, which greatly increases the axial strength and the bending strength of the pile, thereby reducing the construction cost by significantly reducing the thickness of the steel pipe than using the steel pipe pile alone. In addition, it provides a composite pile, a method of manufacturing the same, and a method of embedding a composite pile using the same, which can be easily connected with PHC piles.

In addition, another object of the present invention, in the expansion pipe portion and the transition portion of the concrete pipe located in the upper portion of the composite pile wrapped spiral wire outside the PC steel wire, PC steel wire in the composite portion of the concrete pipe located in the lower portion of the composite pile Spiral wire is placed inside or outside of to increase the axial strength and flexural strength of composite piles by the binding effect of concrete pipes by spiral wires, as well as increase the cross-sectional area of expansion pipe of concrete pipe and reinforce the head of expansion pipe. When installing a band to provide a synthetic pile and its manufacturing method and the method of embedding a composite pile using the same to minimize the breakage of the head when crushing the synthetic pile.

In addition, another object of the present invention, by fixing the guide member inclined to the center in the shoe plate in close contact with the steel pipe when the composite pile and the lower PHC pile, the composite pile in the hollow portion of the PHC pile inserted into the service drilling hole By combining the inclined guide member fixed on the shoe plate of the machine, the center axis of the PHC pile and the synthetic pile can be easily matched, and the work plate and steel pipe of the PHC pile head plate and the composite pile are firmly fixed by welding and bolting. It is to provide a synthetic pile and its manufacturing method and a method of embedding composite pile using the same to reduce the working time and reduce the construction cost by improving the.

In addition, another object of the present invention, by fixing the composite pile to the PHC pile inserted into the service drilling hole for the joint operation of the pile to form a composite pile, and inserting the composite pile into the cement milk-filled drilling hole After that, construct a pile with high resistance to horizontal load by smashing it, and after construction of the composite pile, crush or cut the concrete pipe expansion part and transition part of the composite pile exposed to the ground and cut the composite part of the synthetic pile into the foundation of the structure. Synthetic pile and its manufacturing method and its use which can shorten the construction period and reduce construction cost by improving pile resistance and workability for tofu cleaning by connecting pile with vertical load and horizontal load. The purpose is to provide a method for embedding composite piles.

The synthetic pile of the present invention,

Steel pipes;

A shoe plate fixed to the lower end of the steel pipe;

A PC steel wire having the other end fixed to the shoe plate and prestressed;

The composite part is provided with a pre-compression stress is introduced into the concrete located inside the steel pipe by the tension force of the PC steel wire, connected to the composite portion to have the same outer diameter as the inner diameter of the steel pipe is a pre-compression stress is introduced into the concrete by the tension force of the PC steel wire It is characterized in that it comprises a concrete pipe having a transition portion is provided, connected to the transition portion is expanded to the same diameter as the outer diameter of the steel pipe is provided with an expansion pipe is fixed to one end of the PC steel wire.

Method for producing a synthetic pile of the present invention,

Forming a lower die formed by fixing a lower auxiliary formwork having the same thickness as that of the steel pipe and connecting a lower connecting formwork to the lower formwork;

Mounting a steel pipe on the lower formwork so that the upper end is in close contact with the lower auxiliary formwork;

Contacting the shoe plate to which the guide member is fixed while the other end of the PC steel wire is fixed to the lower end of the steel pipe;

Fixing one end of the PC steel wire having the other end fixed to the shoe plate to a fixing unit fixed to the tension plate;

Placing concrete on the inside of the steel pipe and the lower auxiliary formwork and the lower connecting formwork seated on the lower formwork;

Seating and fixing the upper die and the upper connecting die to which the upper auxiliary die is fixed to the lower die and the lower connecting die;

Tensioning the PC steel wire by pulling the tension plate installed in the lower and upper connection dies by a jack device;

Forming a concrete pipe having a composite part, a transition part, and an expansion part by rotating the lower die and the upper and lower dies;

When the concrete pipe is formed, it is characterized in that it comprises a step of forming a synthetic pile by dismantling the lower, the upper formwork and the lower, upper connection formwork.

The embedding method of the composite pile using the synthetic pile of the present invention,

Inserting a PHC stake into a service hole drilled in the ground;

Coupling a central axis of the PHC pile and the synthetic pile by coupling the guide member of the synthetic pile manufactured by the manufacturing method of any one of claims 9 to 16 to the hollow portion of the PHC pile;

Fixing the head end plate of the PHC pile and the steel pipe and the shoe plate of the synthetic pile to form a composite pile;

Lifting the composite pile and inserting it into a punched hole in which cement milk is injected and struck;

Hardening the cement milk filling the perforated hole and the composite pile after the warping of the composite pile;

It is characterized in that it comprises a step of crushing and cutting the expansion portion and the transition portion of the synthetic pile protruding to the upper ground of the composite pile, and connecting the composite portion of the synthetic pile to the bottom foundation.

According to the present invention, the compressive force is improved by the steel pipe to improve the binding force of the concrete pipe, and the tension force is applied to the PC steel wire, so that not only the expansion pipe and the transition pipe of the concrete pipe but also the composite pipe of the concrete pipe located inside the steel pipe are subjected to compressive stress. By this action, not only can greatly increase the axial strength and bending strength of the pile, but also can reduce the cost of construction by significantly reducing the thickness of the steel pipe than when using only the steel pipe pile to have the advantage of improving the economics. .

In addition, according to the present invention, in the expansion portion and the transition portion located in the upper portion of the composite pile, the spiral wire is wrapped around the outside of the PC steel wire, and in the composite portion located in the lower portion of the synthetic pile, the spiral wire inside or outside the PC steel wire By increasing the axial and flexural strength of concrete pipes by the restraint effect of spiral wires, it also increases the cross-sectional area of the expansion pipe of concrete pipes and installs a reinforcing band on the head to break the head when driving composite piles. By minimizing the quality to improve the user can have an advantage to improve the reliability of the product.

In addition, according to the present invention, by fixing the guide member inclined to the center in the shoe plate in close contact with the steel pipe, when the joint of the composite pile and PHC pile, the guide member of the synthetic pile is coupled to the hollow portion of the PHC pile while the central axis of the two piles By easily matching, it is possible to shorten the working time by improving the working efficiency of the pile joint work, as well as to improve the quality of the pile joint construction.

In addition, according to the present invention, the composite pile is fixed to the PHC pile inserted into the service drilling hole for the joint operation of the pile to form a composite pile, and after inserting the composite pile into the drilling hole injecting cement milk, Construct piles with high resistance to horizontal loads, and after construction of composite piles, break or cut concrete pipe expansion and transition portions of composite piles exposed to the ground, and connect the composite portions of composite piles with the base of the structure. By improving the resistance to vertical and horizontal loads of piles and the workability for arranging the heads, it is possible to shorten the construction period required for pile construction and reduce construction costs.

1 is a cross-sectional view of a conventional synthetic pile
2 is a perspective view of the present invention
Figure 3 is a cross-
4 is a production diagram of the present invention
5 to 6 is a construction process diagram of the present invention
Figure 7 is a cross-sectional view of the joint of the present invention composite pile and PHC pile
8 is a cross-sectional view of another embodiment of the present invention composite pile and PHC pile joint

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a perspective view of the present invention, Figure 3 is a cross-sectional view of the present invention.

The composite pile 100 of the present invention, the steel pipe 110 is configured, the shoe plate 120 is fixed to the lower end of the steel pipe 110 is configured, the other end is fixed to the shoe plate 120 is pre-stressed PC wire 130 is configured, the composite portion 141 is provided with a pre-compression stress is introduced into the concrete located inside the steel pipe 110 by the tension of the PC steel wire 130, the steel pipe 110 in the composite portion 141 It is connected to have an outer diameter equal to the inner diameter of the) is provided with a transition portion 142 is introduced into the pre-compression stress into the concrete by the tension of the PC steel wire 130, is connected to the transition portion 142 and the outer diameter of the steel pipe 110 It is configured to include a concrete pipe 140 is provided with an expansion pipe 143 that is fixed to the same diameter as one end of the PC steel wire 130 is fixed, as described in more detail as follows.

It is formed to the periphery of the shoe plate 120 is further provided with a seating jaw (120 ') that is seated on the steel pipe (110).

The diameter of the shoe plate 120 is smaller than the outer diameter of the steel pipe 110 when fixing the joint of the composite pile 100 and the PHC pile 10 by welding, the composite pile 100 and PHC When fixing the joint of the pile 10 by bolting, it is preferable that the pile 10 is formed larger than the outer diameter of the steel pipe 110.

The guide plate 121 is fixed to the shoe plate 120 and coupled to the hollow portion of the PHC pile 10 when the PHC pile 10 and the welding joint are provided.

The guide member 121 is preferably inclined or tapered toward the center of the shoe plate 120.

In addition, the upper end of the expansion pipe 143 is configured to further include a reinforcing band 150 to reinforce the strength of the concrete wrapped around the expansion pipe 143 to the same diameter as the steel pipe 110.

The outer spiral wire 160 is further included to surround the outer circumferential surface of the PC steel wire 130 inside the transition part 142 and the expansion pipe part 143 to reinforce the axial strength and the bending strength of the concrete pipe 140.

It is further configured to include a spiral wire 170 installed inside or outside the PC steel wire 130 inside the synthesis unit 141 to reinforce the axial strength and flexural strength of the concrete pipe 140.

The following describes the manufacturing process of the present invention configured as described above.

First, as shown in FIG. 4, the upper and lower dies 210 and 210 'and the upper and lower dies 220 and 220' having the same inner diameter as the outer diameter of the steel pipe 110 are formed. The upper and lower dies 210 and 210 'form upper and lower secondary dies 210a and 210a'.

The upper and lower auxiliary dies 210a and 210a 'protrude into the upper and lower dies 210 and 210' to form the transition pile 142 of the concrete pipe 140 to manufacture the synthetic pile 100. It serves to fix the position of the steel pipe 110 during.

When the upper and lower formwork 210 and 210 'and the upper and lower connection formwork 220 and 220' are formed, the upper end of the lower formwork 210 'and the lower end of the lower connection formwork 220' are connected to each other. The steel pipe 110 is seated on the lower formwork 210 'in a fixed state, and the upper end of the steel pipe 110 should be in close contact with the lower auxiliary formwork 210a'.

When the upper end of the steel pipe 110 is in close contact with the lower auxiliary formwork 210a ', the PC steel wire 130 is coupled to protrude from the lower end of the steel pipe 110, which is located at the lower end of the steel pipe 110 The PC steel wire 130 is fixed to the fixing unit 122 of the shoe plate 120, the shoe plate 120 is in close contact with the lower end of the steel pipe (110).

At this time, the seating jaw (120 ') formed around the shoe plate 120 is seated on the lower end of the steel pipe 110, the shoe plate 120 is preferably formed to be the same as the diameter of the steel pipe 110, synthetic pile ( 100) and when the joint of the PHC pile 10 is fixed by welding, is formed smaller than the outer diameter of the steel pipe 110, when fixing the joint of the composite pile 100 and PHC pile 10 by bolting It is more preferable to form larger than the outer diameter of the steel pipe 110, the periphery of the shoe plate 120 is preferably formed to be inclined to be welded with the head end plate of the lower PHC pile (10).

One end of the PC steel wire 130 protruding to the upper end of the steel pipe 110 is fixed to the fixing unit 123 coupled to the tension plate 230, the tension plate 230 in a state seated on the lower connecting die 220 ' ) To the jack device 240.

Here, the outer helical wire 160 is fixed to the outer circumferential surface of the PC steel wire 130 located in the lower connection formwork 220 'and the lower auxiliary formwork 210a', and the steel pipe is seated on the lower formwork 210 '. 110, it is possible to fix the spiral wire 170 inside or outside the PC steel wire 130 is located inside, the outer spiral wire 160 and the spiral wire 170 is the outside and inside of the PC steel wire 130 It is fixed by welding to the PC steel wire 130 to be located in, the reinforcing band 150 is a lower connection die in a state fixed to a separate connection member (not shown) to the fixing unit 123 coupled to the tension plate 230 It is in close contact with the tension plate 230 seated on (220 ').

When the steel pipe 110 and the PC steel wire 130, the reinforcing band 150 is fixed in the above process, the steel pipe 110 seated in the lower formwork 210 'through the through hole (not shown) of the shoe plate 120 After pouring concrete into the inner and lower auxiliary formwork 210a 'and the lower connecting formwork 220', the upper formwork 210 and the upper connecting formwork on the lower formwork 210 'and the lower connecting formwork 220'. The jack device 240 is rotated in the forward direction while the 220 is seated and fixed.

At this time, when the tension plate 230 is moved toward the jack device 240 according to the forward rotation of the jack device 240, the reinforcing band 150 fixed to the fixing unit 123 of the tension plate 230 is moved. At the same time, a tension force is introduced into the PC steel wire 130 fixed to the fixing unit 123, the other end of the PC steel wire 130 is fixed to the fixing unit 122 of the shoe plate 120, the steel pipe 110 Since the position is fixed by the upper and lower auxiliary dies 210a and 210a ', the tension force is introduced into the PC steel wire 130 in a stable state.

When the PC steel wire 130 is strained, the upper, lower die (210) (210 ') and the upper, lower die (220, 220') by rotating the upper, lower die (210, 210 ') and the upper The concrete placed in the lower connecting dies 220 and 220 'is formed by the centrifugal force of the steel pipe 110 and the upper and lower auxiliary dies 210a and 210a', and the upper and lower connecting dies 220 and 220 '. As well as being in close contact with the reinforcing band 150, while curing the PC steel wire 130, the outer spiral wire 160 and the spiral wire 170 is cured, the concrete pipe 140 is formed, then steam curing in the autoclave synthesized To form the pile 100.

When the composite pile 100 is molded, the jack device 240 and the tension plate 230 is separated from the upper and lower connection dies 220 and 220 'and at the same time, the concrete is restored to the tension of the PC steel wire 130. The pre-compression stress is applied over the entire length of the tube 140, the outer diameter of the composite portion 141 and the transition portion 142 of the concrete tube 140 is formed to the same diameter as the inner diameter of the steel pipe 110 and synthesized Since the portion 141 is compressed by a predetermined amount inside the steel pipe 110, the axial strength and the bending strength of the concrete pipe 140 are increased by the restraining effect of the steel pipe 110.

When the preceding compressive stress is introduced to the concrete pipe 140 in the above process, by separating the composite pile 100 from the upper, lower die (210) (210 ') and the upper, lower connection die (220, 220') Form.

The embedding method of the composite pile 100 'using the synthetic pile 100 formed as described above, as shown in Figures 5 to 6, perforating the service drilling hole for the joint work of the pile on the ground, the service After inserting the PHC pile 10 into the drilling hole, the composite pile 100 is seated on the head of the PHC pile 10, the guide member 121 fixed to the shoe plate 120 of the synthetic pile 100 ) Is coupled to the hollow portion of the PHC pile 10 can easily match the central axis of the PHC pile 10 and the synthetic pile 100, it is possible to shorten the working time by improving the work efficiency.

When the central axis of the synthetic pile 100 and the PHC pile 10 coincide with each other, as shown in FIG. 7, the steel pipe 110, the shoe plate 120, and the PHC pile 10 of the synthetic pile 100 are formed. The head end plate is fixed by welding to form a composite pile 100 ′. Since the diameter of the shoe plate 120 is smaller than the diameter of the steel pipe 110, the periphery is formed to be inclined, so that the steel pipe of the composite pile 100 is formed. While the welding of the head plate 110 and the shoe plate 120 and the PHC pile 10 can be easily performed at a time, the bending strength of the weld portion can be increased.

Here, as shown in Figure 8, the diameter of the head plate of the PHC pile 10 and the shoe plate 120 of the synthetic pile 100, the diameter of the PHC pile 10 and the steel pipe of the synthetic pile 100 ( 110 and larger than the diameter, the shoe plate 120 and the head end plate may be wrapped with the band 180 to be fixed by the fastening of the bolt 181.

After lifting up the composite pile 100 'formed by fixing the PHC pile 10 and the synthetic pile 100 by welding or bolting, and inserting it into a drilled hole in which cement milk (C) is injected. At this time, the upper end of the synthetic pile 100 located on the upper portion of the composite pile 100 'is constrained by the reinforcing band 150, as well as the cross section of the expansion pipe 143 of the concrete pipe 140 is increased as a beating It can be safely installed with minimal damage to the pile head.

In addition, when the composite pile (100 ') is inserted into the drill hole and struck, the steel pipe 110 of the composite pile 100 is in the same line with the ground, the transition portion 142 and expansion pipe 143 is ground It is preferable to be struck so as to protrude, and a portion of the cement milk (C) injected into the drilling hole is flowed back into the space between the composite pile 100 'and the drilling hole is discharged to the outside of the drilling hole, the composite pile (100) Cement milk (C) remaining in the space between ') and the drilling hole is cured.

When the cement milk (C) is cured, the upper end of the composite pile (100 '), that is, crushed or cut the transition portion 142 and the expansion pipe 143 of the synthetic pile 100 protruding to the ground, the synthetic pile Construction of the composite portion 100 while completing the construction of the composite portion 141 is connected to the bottom foundation (100).

At this time, since the shear force and the bending moment of a large size act on the upper portion of the composite pile 100 ', it is reinforced by the steel pipe 110 in the composite pile 100, and the composite portion 141 having a large shear strength and bending strength is connected to the ground foundation. In order to easily and economically clean the head of the composite pile 100 ', the portion protruding to the ground from the composite pile 100' is preferably made of concrete, and thus the transition portion 142 of the synthetic pile 100 is The sum of the lengths of the expansion pipes 143 is preferably 0.5 to 1.2 m, which is the minimum protruding length for applying a hit to the pile.

In addition, the composite pile 100 'manufactured by fixing the composite pile 100 and the PHC pile 10 by welding has the same cross-sectional area of the pile to be joined, so that the driving force applied to the synthetic pile 100 is synthesized. (100) Since the stable transmission to the PHC pile 10 of the lower part improves the piercing penetration of the pile to increase the vertical bearing capacity of the composite pile (100 '), as well as do not use a separate joint member for the joint of the pile The construction is simple, which shortens the construction period and improves economics due to the reduction of materials.

As described above, the present invention, although described by the limited embodiments and drawings, terms or words used in the present specification and claims are not limited to the ordinary or dictionary meanings and should not be interpreted, the technical spirit of the present invention It must be interpreted to mean meanings and concepts. Therefore, the configuration shown in the embodiments and drawings described herein are only one embodiment of the present invention, and do not represent all of the technical spirit of the present invention, various changes within the scope of the claims of the present invention It should be understood that there may be equivalents and variations.

100: composite pile 110: steel pipe
120: Span 130: PC steel wire
140: concrete pipe 150: reinforcement band
160: outer spiral wire 170: spiral wire
100 ': compound pile 10: PHC pile

Claims (19)

Steel pipes;
A shoe plate fixed to the lower end of the steel pipe;
A PC steel wire having the other end fixed to the shoe plate and prestressed;
The composite part is provided with a pre-compression stress is introduced into the concrete located inside the steel pipe by the tension force of the PC steel wire, connected to the composite portion to have the same outer diameter as the inner diameter of the steel pipe is a pre-compression stress is introduced into the concrete by the tension force of the PC steel wire Synthetic pile is characterized in that it comprises a concrete pipe is provided with a expansion pipe is provided, the expansion portion is connected to the transition portion and expanded to the same diameter as the outer diameter of the steel pipe is fixed to one end of the PC steel wire.
The method according to claim 1,
The synthetic pile is formed around the shoe plate further comprises a seating jaw to be seated in the steel pipe.
The method according to claim 2,
The diameter of the shoe plate is smaller than the outer diameter of the steel pipe when fixing the joints of the composite pile and the PHC pile by welding, and larger than the outer diameter of the steel pipe when the joints of the synthetic pile and the PHC pile are fixed by bolting. Composite pile, characterized in that formed.
The method according to claim 1,
It is fixed to the shoe plate, the composite pile characterized in that it further comprises a guide member coupled to the hollow portion of the PHC pile when welding the PHC pile.
The method of claim 4,
The guide member is a synthetic pile, characterized in that formed to be inclined or tapered toward the center of the shoe plate.
The method according to claim 1,
Composite pile, characterized in that further comprising a reinforcing band to reinforce the strength of the concrete wrapped in the expansion pipe portion the same diameter as the steel pipe in the upper end of the expansion pipe.
The method according to claim 1,
Synthetic pile, characterized in that it further comprises an outer spiral wire to reinforce the axial strength and bending strength of the concrete pipe wrapped around the outer peripheral surface of the PC steel wire inside the transition portion and expansion pipe.
The method according to claim 1,
The composite pile, characterized in that it further comprises a spiral wire to be installed inside or outside the PC steel wire inside the composite portion to reinforce the axial strength and flexural strength of the concrete pipe.
Forming a lower die formed by fixing a lower auxiliary formwork having the same thickness as that of the steel pipe and connecting a lower connecting formwork to the lower formwork;
Mounting a steel pipe on the lower formwork so that the upper end is in close contact with the lower auxiliary formwork;
Contacting the shoe plate to which the guide member is fixed while the other end of the PC steel wire is fixed to the lower end of the steel pipe;
Fixing one end of the PC steel wire having the other end fixed to the shoe plate to a fixing unit fixed to the tension plate;
Placing concrete on the inside of the steel pipe and the lower auxiliary formwork and the lower connecting formwork seated on the lower formwork;
Seating and fixing the upper die and the upper connecting die to which the upper auxiliary die is fixed to the lower die and the lower connecting die;
Tensioning the PC steel wire by pulling the tension plate installed in the lower and upper connection dies by a jack device;
Forming a concrete pipe having a composite part, a transition part, and an expansion part by rotating the lower die and the upper and lower dies;
When the concrete pipe is formed, dismantling the lower, the upper formwork and the lower, upper connection formwork, the method of manufacturing a composite pile, characterized in that it comprises the step of forming a synthetic pile.
The method according to claim 9,
Formed around the shoe plate is a manufacturing method of a synthetic pile, characterized in that it further comprises a seating jaw to be seated in the steel pipe.
The method of claim 10,
The diameter of the shoe plate is smaller than the outer diameter of the steel pipe when fixing the joints of the composite pile and the PHC pile by welding, and larger than the outer diameter of the steel pipe when the joints of the synthetic pile and the PHC pile are fixed by bolting. Method for producing a synthetic pile, characterized in that formed.
The method according to claim 9,
Fixed to the shoe plate, PHC pile and the method of manufacturing a composite pile, characterized in that it further comprises a guide member coupled to the hollow portion of the PHC pile when welded.
The method of claim 12,
The guide member is a method of manufacturing a composite pile, characterized in that formed to be inclined or tapered toward the center of the shoe plate.
The method according to claim 9,
And a step of seating the reinforcing band surrounding the expansion pipe with the same diameter as the steel pipe at the upper end of the expansion pipe and seating the lower connection die in close contact with the tension plate.
The method according to claim 9,
The method of manufacturing a composite pile, characterized in that further comprising the step of wrapping the outer circumferential surface of the PC steel wire inside the transition portion and expansion tube with an outer spiral wire.
The method according to claim 9,
The method of manufacturing a composite pile, characterized in that further comprising the step of installing a spiral wire inside or outside the PC steel wire inside the synthesis unit.
Inserting a PHC stake into a service hole drilled in the ground;
Coupling a central axis of the PHC pile and the synthetic pile by coupling the guide member of the synthetic pile manufactured by the manufacturing method of any one of claims 9 to 16 to the hollow portion of the PHC pile;
Fixing the head end plate of the PHC pile and the steel pipe and the shoe plate of the synthetic pile to form a composite pile;
Lifting the composite pile and inserting it into a punched hole in which cement milk is injected and struck;
Curing cement milk filling the hole between the drilled hole and the composite pile after the composite pile;
Breaking and cutting the expansion part and the transition part of the synthetic pile protruding to the upper ground of the composite pile, and connecting the composite portion of the synthetic pile to the bottom foundation .
18. The method of claim 17,
Embedding the composite pile using the composite pile, characterized in that for fixing the steel pipe and the shoe plate of the head end plate and the synthetic pile of the PHC pile by welding.
19. The method of claim 18,
Embedding method of the composite pile using the composite pile, characterized in that the head plate of the PHC pile and the shoe plate of the synthetic pile is wrapped in a band and fixed by bolting.

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