KR101737475B1 - Composite phc pileand construction method therefor - Google Patents

Abstract

The present invention relates to a composite PHC pile and a construction method thereof which allow filling concrete and a front end reinforcing body to be integrated with a PHC pile body (composite PHC pile) to effectively resist horizontal force and bending moment near the ground surface. The composite PHC pile comprises: a PHC pile body; an upper reinforcing body installed to reinforce an upper end portion of the PHC pile body; and a front end reinforcing body on a front end of the PHC pile body.

Description

Technical Field [0001] The present invention relates to a composite PHC pile,

The present invention relates to a composite PHC pile and a construction method thereof. More specifically, the present invention relates to a composite PHC pile and a construction method thereof, in which a filled concrete and an end reinforcement body are integrated with a PHC pile body (composite PHC pile) to effectively resist horizontal force and bending moment near the ground surface.

Conventionally, a pile foundation for a structure used as a deep foundation can be roughly divided into a steel pipe pile and a PHC pile (a centrifugal force high strength concrete pile of a pretension type).

In particular, the PHC pile has no problem in applying the PHC pile because it has a comparative advantage in terms of the construction efficiency as well as the economic efficiency in the case of the structure having a large influence of the vertical force as compared with the steel pipe pile,

The PHC pile has a small resistance to a structure having a large influence of the horizontal force (shear force) and the bending moment such as earth pressure and seismic load. Therefore, there is a problem in that it is inevitable to use a relatively expensive steel pipe pile.

As shown in FIG. 1A, a synthetic PHC pile 20 is also introduced. Conventional PHC piles are provided with a steel bar 21 and a spiral reinforcing bar 22.

Since the steel rods 21 introduce a tensile force (longitudinal direction), a large number of them are spaced apart from each other inside the mold, and the spiral reinforcing bars 22 are reinforced by a plurality of reinforcing rods 21, And is a reinforcing bar that is installed while spirally surrounding the steel rods 21.

1A, the synthetic PHC pile 20 is extended and protruded toward the hollow portion S of the PHC pile to be completed while enclosing the reinforcing bar 21 and the spiral reinforcing bar 22 as internal stiffeners, Is formed.

An example of manufacturing the synthetic PHC pile 20 is as follows. After the internal stiffeners 21 and 22 and the shear connector 23 are disposed in a mold, the concrete for the hollow concrete pile is inserted into the mold.

The concrete for the hollow concrete pile inserted by the centrifugal force can be formed while having the predetermined thickness from the inner side of the mold, so that the hollow concrete pile can be manufactured in the form of hollow tube.

The concrete for the hollow concrete pile inserted therein is hardened to form the hollow concrete pile portion 11 and then the mold is demolded to complete the synthetic PHC pile 10 in which the shear connection member 23 is exposed to the hollow portion S .

As a result, it can be understood that the conventional synthetic PHC pile is constructed so that the structural performance of the pile having the conventional PHC pile is used as it is, but the supporting force of the PHC pile can be further secured by reinforcing the pile with the shear connector (23).

FIG. 1B is a construction cross-sectional view of the conventional synthetic PHC pile 41 and the base portion 42. FIG.

That is, after the perforated hole is formed in the ground, the synthetic PHC pile 41 is inserted, and then the hollow portion S is filled with the vertical reinforcing bars before filling the hollow filled portion 43 into the hollow portion S. It can be seen that the head reinforcing means 44 is provided.

The head reinforcing means 44 is formed to be installed in a section (a certain depth of the hollow portion) in which the shear connector 23 is installed, and the upper end thereof is protruded upward from the upper surface of the synthetic PHC pile.

The upper end of the upwardly projected head reinforcing means 44 is engaged with the base reinforcement bars previously set on the base portion 42. [

As a result, it is known that the upper end of the PHC pile having a large bending moment, such as near the ground surface, is reinforced by the shear connector 23, but the integrity with the base portion 42 is secured by using the head reinforcing means 44 .

FIG. 1C shows that a conventional PHC pile can be connected to a synthetic PHC pile 20 to be connected using a connecting means 26 at the lower end of a synthetic PHC pile in order to secure a predetermined extension length.

In other words, various connecting means for connection of conventional PHC pile or synthetic PHC pile have been introduced, but if they are classified into large types, mechanical fastening or welding is used.

FIG. 1D is an exemplary view in which a tip of a PCH pile is formed by expanding a conventional PHC pile to secure a tip end supporting force.

It can be seen that the tip-expanding type PHC pile is made to increase the diameter of the tip portion by using the tip extension plate 27, thereby further securing the tip end supporting force.

In other words, it can be seen that the conventional PHC pile is a very economical file with excellent structural performance, but the cross-sectional area of the tip of the PHCH pile is increased in order to enhance the supporting capacity of the PHC pile.

Accordingly, it is an object of the present invention to provide a tip reinforcing member capable of increasing the tip end supporting force while sufficiently securing the structural performance of the PHC pile through the upper end reinforcement member while facilitating connection in the conventional PHC pile, The present invention provides a composite PHC pile capable of providing a head reinforcing means and a method of constructing the same.

In order to achieve the above object, a composite PHC pile of the present invention comprises:

PHC pile body; And a top reinforcing member installed to reinforce an upper end of the PHC pile main body, wherein the top reinforcing member is a center pipe, which is extended upward by a circular steel pipe on the upper surface of the lower finishing plate; PHC: upper hanging bed which is a bending reinforcing bar extending horizontally on the outer peripheral surface of the center paper-making pipe to cover the upper surface of the pile main body; And a reinforcing bar extending in a space between the center pipe and the inner circumferential surface of the hollow portion of the PHC pile body to reinforce the filled concrete filled in the space and to integrate the upper reinforcing body with the PHC pile body,
The bending moment generated near the ground surface together with the center pipe and the reinforcing bars while the filled concrete is filled in the closed space between the inner surface of the bottom finishing plate, the center pillar tube, and the PHC pile body hollow portion, And the head reinforcement means is formed on the inner side surface of the center paper tube, and the hanging reinforcing bar and the head reinforcing bar are installed on the upper surface of the reinforcing bar. A finishing plate on which a bending opening is formed; And the lower end of the composite PHC pile is fitted to the open portion of the bent open portion and the upper end is bent horizontally so as to be supported on the upper surface of the PHC pile body of the composite PHC pile. And a head restraining bar which is formed by inserting a lower end into an opening of the folding opening and having an upper end extending in a vertical direction and a vertical bar surrounding the vertical bar, It is inserted into the center paper tube in a state in which the locking bar and the head reinforcing bar are formed.

According to another aspect of the present invention, there is provided a method of constructing a composite PHC pile,

(a) inserting the composite PHC pile into a perforation hole formed in the ground; (b) using the tip reinforcing member formed at the distal end of the PHC pile main body to allow the tip reinforcing member to penetrate into the tip of the perforation hole; (c) filling and filling filler concrete between the central core tube of the composite PHC pile and the inner circumferential surface of the hollow portion of the PHC pile body, so that the composite PHC pile is installed on the ground below the foundation.

The composite PHC pile according to the present invention can easily integrate the upper reinforcing member on the upper surface of the PHC pile main body and can integrate the upper reinforcing member with the underfilled concrete (foundation concrete) to more effectively resist bending moment near the ground surface and large horizontal force And it is possible to provide an efficient composite PHC pile and a construction method thereof by simplifying installation.

In addition, the head reinforcing means can be installed in combination with the upper reinforcing member, and also can be installed in a manner that the reinforcing member can simply be installed inside the upper reinforcing member, thereby providing a composite PHC pile having excellent workability and workability and a method of constructing the same Lt; / RTI >

Also, it is possible to provide a composite PHC pile and its construction method which are very advantageous for securing the supporting force because the tip reinforcing body can penetrate the tip of the composite PHC pile simply to the soft rock and the light rock as well as the soil.

Figs. 1A and 1B are a cross-sectional view and a construction cross-sectional view of a conventional synthetic PHC pile,
1C is a connection diagram of a conventional synthetic PHC pile,
FIG. 1D is a cross-sectional view of a prior art synthetic PHC pile,
FIGS. 2A, 2B and 2C are a perspective view and a cross-sectional view of a composite PHC pile of the present invention,
3 is a perspective view of the connection means of the composite PHC pile of the present invention,
Figure 4 is an illustration of an end extension of a composite PHC pile of the present invention,
FIGS. 5A, 5B and 5C are construction diagrams of the composite PHC pile of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Compound PHC pile (100) of the present invention]

FIGS. 2A, 2B, and 2C illustrate a perspective view and a cross-sectional view of the composite PHC pile 100 of the present invention.

As shown in FIG. 2A, the composite PHC pile 100 includes a PHC pile main body 110, an upper end reinforcement 120, a tip reinforcement 130, and a head reinforcement 140.

2B, the PHC pile main body 110 has a hollow concrete pile 111 as a PHC pile and a steel rod 112 and a spiral reinforcing bar 113 as internal stiffeners in the hollow concrete pile 111 .

The steel rods 112 are formed in such a manner that the steel rods 112 are fixed to the fixing plates 114 on the bottom and top surfaces of the PHC piles after they are tilted. The spiral reinforcing rods 113 are spirally arranged so as to surround the steel rods 112.

As shown in FIG. 2B, the upper reinforcing member 120 is provided to reinforce the upper end of the PHC pile main body 110, and when the bending moment and the horizontal force are largely generated near the ground surface, The PHC pile main body 110 may be directly inserted into the upper hollow portion of the PHC pile main body 110 to reinforce the upper end of the PHC pile main body 110, The body 120 is installed.

The upper reinforcement member 120 includes a lower finishing plate 121, a center support tube 122, an upper support member 123, a reinforcement rope 124, and a filler concrete 125, as shown in FIGS. 2B and 2C. do.

As shown in FIGS. 2B and 2C, the lower finishing plate 121 is made of a circular steel plate so that the central branch pipe 122 is supported at the center of the upper surface, and the function of preventing the filling concrete 125, which will be described later, I have.

As shown in FIGS. 2B and 2C, the center pillar tube 122 is a main reinforcing material to more effectively resist the bending moment and the horizontal force in the vicinity of the ground surface where the composite PHC pile 100 is installed, As shown in Fig.

Thus, the filler concrete 125 is filled between the center pipe 122 and the inner circumferential surface of the hollow portion of the PHC pile main body 110.

The upper hooking part 123 has a function of allowing the upper reinforcing member 120 to be suspended from the PHC pile main body 110 as shown in FIG. 2B and FIG. 2C, And it is formed as a bending reinforcing bar extending horizontally on the upper outer peripheral surface of the central branch tube 122.

2B, the reinforcing rope 124 reinforces the filler concrete 125 filled with the filler concrete 125 between the center pipe 122 and the inner circumferential surface of the hollow portion of the PHC pile main body 110, ) Is integrated with the PHC pile body (110).

The reinforcing rods 124 are fixed on the upper surface of the lower finishing plate 121 and include a vertical reinforcing rope 124a extending upwardly and a plurality of upwardly extending reinforcing rods 124a and a center pipe 122, The upper end of the vertical reinforcement rope 124a is formed to extend upward from the upper surface of the PHC pile main body 110 and the band reinforcement rope 124b is formed so as to correspond to the height of the central branch pipe 122, As shown in FIG.

2C, the filled concrete 125 is a concrete filled in a closed space between the lower finishing plate 121, the center pipe 122, and the inner side surface of the hollow portion of the PHC pile main body 110, and the PHC pile main body 110 And the upper reinforcing member 120 together with the central branch tube 122 and the reinforcing rods 124 to effectively resist the bending moment and the horizontal force that occur most in the vicinity of the ground surface.

As shown in FIG. 2A, the tip reinforcing member 130 is integrally formed on the bottom surface of the PHC pile main body 110 and has a tip supporting force extended to the tip of the perforation hole of the ground, and a bit penetrating the tip is formed, Contributing to the stable and effective expansion of the supporting performance of the main body 110.

Thus, the end reinforcement member 130 can be formed to include the tip extension plate 131 and the penetration bit 132.

The distal end extension plate 131 is integrally formed on the bottom surface of the PHC pile main body 110. The front end extension plate 131 is integrally formed on the bottom surface of the PHC pile main body 110. In order to fix the rigid rod 112 to the bottom surface of the PHC pile main body 110 after fixing, The distal end extension plate 131 of the endoscope 100 is integrated.

At this time, the distal end extension plate 131 has a larger diameter than the fusing plate 114 to extend the supporting ability of the PHC pile main body 110 so as to have an extended tip end. So that the fixing plate is supported on the upper surface of the end extension plate 131.

The penetration bit 132 is a bit formed as a downwardly protruding bit on the bottom surface of the tip extension plate 131. The composite PHC pile 100 is inserted into the perforation hole H, So that the tip of the hole 100 is reliably supported at the tip of the hole H.

In other words, in forming the perforation hole H, disturbed ground and cement milk are mixed at the tip of the perforation hole H, so that it is difficult to secure the tip end supporting force. Thus, the tip of the composite PHC pile 100, As shown in FIG.

2b, 2c and 5c, the head reinforcing unit 140 has a function of integrating the foundation 300 and the composite PHC pile 100 together. The present invention can be simply applied to a composite PHC pile 100 to be mounted on the head.

2C, the head reinforcing unit 140 includes a finishing plate 141, a retaining bar 142, and a head reinforcing bar 143 installed in the hollow portion S of the composite PHC pile 100 .

The finishing plate 141 may be formed of a lower finishing plate 121 of the upper reinforcement member 120 as described above and may be formed horizontally inside the center pipe 122.

Such a finishing plate serves to prevent the concrete caused by the placement of the foundation concrete from leaking into the inside of the center paper tube.

On the upper surface of the finishing plate 141, there is formed a folding open portion 144 to which the engaging reinforcing bar 142 and the head reinforcing reinforcing bar 143 can be attached.

The lower end of the retaining reinforcing bar 142 is fitted to the opening of the folding opening 144 and the upper end of the retaining reinforcing bar 142 is bent horizontally to be supported on the upper surface of the PHC pile main body 110 of the composite PHC pile 100 .

The lower end of the head reinforcing bar 143 is fitted to the opening of the folding open portion 144 and the upper end of the bar reinforcing bar 143 is formed with a vertical bar 143a and a bar bar 143a, And 143b.

The engaging rib 142 and the head reinforcing rib 143 are formed on the finishing plate 141 and inserted into the center hollow tube 122 or the hollow portion of the head of the PHC pile main body 110, It can be easily installed by being supported on the upper surface thereof.

[Linkage of the composite PHC pile (100) of the present invention]

FIG. 3 shows a connection structure of the composite PHC pile 100 of the present invention.

The extension length of the composite PHC pile 100 as described above is limited. This is because it is manufactured using a plant facility, so that it is manufactured to have a uniform length depending on the length of the molding form. In the field, since the necessary length of the pile is necessary, the composite PHC pile 100 is connected to each other .

This connection construction is largely mechanical fastening method and welding method, but the welding method is difficult to control quality and takes a long time for welding, so mechanical fastening method is adopted.

3, the connecting means 200 according to the present invention is formed in such a manner that the fixing plates 114 of the composite PHC pile 100 are tightened with respect to each other. The connecting means 200 includes a step fixing plate 210, an intermediate fixing plate 220, A connecting ring 230 and a fixing bolt 240.

First, the stepped fusing plate 210 is a fusing plate on which the steel rods 112 are fixed after being fixed on the upper and lower surfaces of the PHC pile main body 110. The fins are set at the time of manufacturing the PHC pile main body 110, So that a groove portion on which a connection ring 230 to be described later is mounted is formed.

The intermediate fixing plate 220 is an intermediate plate for connecting the staple fixing plates 210 of the two PHC pile main bodies 110 to each other. The fixing holes 212 formed in the stiffening plate 210 are communicated with each other A plurality of fixing holes 221 are formed.

A fixing bolt 240 is fastened to the fixing hole 221 so that the fixing bolt passes through the intermediate fixing plate 220 and passes through the fixing hole 212 of the step fixing plate formed on the lower fixing plate 114 So that the other side is inserted and the step fixing plates 210 are connected to each other while restraining the upper and lower sides via the intermediate fixing plate.

At this time, the fixing bolt 240 may be installed in such a manner that a thread is formed on only one side of the fixing bolt 240 so as to be fastened to the fixing hole of the step fixing plate and inserted into the fixing hole of the other step-

The pair of step fixing plates 210 via the intermediate fixing plate 220 are fastened to each other by the connection rings 230.

The horizontal fixing hole 231 is formed on the outer circumferential surface of the intermediate fixing plate 220 and is fastened to each other by the horizontal fixing bolt 250 passing through the connection ring 230. The upper and lower ends of the connection ring 230 The intermediate fixing plate 220 and the step fixing plate 210 are connected to each other so that the intermediate fixing plate 220 and the step fixing plate 210 are wrapped around each other by the connecting ring 230, It is possible to connect the composite PHC pile 100 quickly without welding.

[Tip extensions of composite PHC piles]

FIG. 4 illustrates another embodiment of a tip extension of a composite PHC pile 100 of the present invention.

Generally, the composite PHC pile (100) is formed not only in the soil layer but also in the support layer such as soft rock, light rock, etc. to form a perforation hole to secure the end support force through head hammering. So that the tip extension can hardly be penetrated into the supporting layer.

Accordingly, the present invention forms the leading end protruding bit 133 instead of forming the penetration bit in the tip extender 131 as shown in FIG.

The tip protruding bit 133 is formed to allow the tip of the composite PHC pile 100 to be penetrated to the support layer such as soft rock,

That is, the protrusion reinforcing shoe 134 is formed at the center of the tip extension plate 131 and the tip protrusion bit 133 in the form of a triangular wedge is integrally formed at the tip of the protrusion reinforcing shoe 134.

The tip extension plate 131 is an extension plate and has a large support area, but the tip protruding bit 133 has a small cross-sectional area, so that the head hovering energy is concentrated so that the support layer such as soft rock,

At this time, it is understood that the projecting reinforcement shoe 134 is supported by the reinforcing support plate in the form of a triangular piece for securing the rigidity while ensuring the integrity with the end extender plate 131.

Of course, only the protruding reinforcing shoe 134 in which the tip protruding bit 133 is not formed may be formed in the tip extender 131.

As shown in FIG. 4, a cylindrical cutting shoe 135 may be formed on the bottom surface of the distal end extension plate 131. It can be said that it is for soft rock which is not for rock rock.

That is, it can be seen that the cylindrical cutting shoe 135 is formed as a tapered cut end, so that the cylindrical cutting shoe 135 is formed in the same ground as the soft rock.

At this time, it is preferable that the connecting portions of the cylindrical cutting shoe and the distal end expansion plate are integrated with each other with inner reinforcing pieces.

[Method of constructing composite PHC pile]

Figures 5A, 5B and 5C show a flowchart of a method of constructing a composite PHC pile.

First, as shown in FIG. 5A, a perforation hole H is formed in a bottom portion of the base portion 300 of the structure. The perforation hole H may have a predetermined diameter by using a perforator not shown in the figure, but a casing may be used to maintain a wall.

When the perforation hole H is formed up to the planned depth, reinforcement of the front end portion is performed by injecting soil cement or the like at the front end portion, which may weaken the tip end supporting force of the composite PHC pile 100 in mixing with the disturbed ground. So that it is possible to penetrate through the tip extender 131 of the composite PHC pile 100 by head hitching.

In the perforation hole H, the composite PHC pile 100, to which two composite PHC piles 100 are connected, is inserted by the connecting means 200.

2A, the composite PHC pile 100 includes a PHC pile main body 110, an upper end reinforcement 120, and a tip reinforcement 130. In particular, the end reinforcement 130 is a penetration It can be understood that the bit 132 is formed but it is of course possible to use the one provided with the tip projecting bit 133, the projecting reinforcing shoe 134 and the cylindrical cutting shoe 135, You can decide.

Next, as shown in FIG. 5B, the composite PHC pile 100 is inserted into the perforation hole H, and then the tip portion of the composite PHC pile 100 is inserted into the perforation hole. Next, the head reinforcing means 140 is additionally installed on the composite PHC pile 100. However, it is not necessary to protrude only the reinforcing rods of the upper reinforcing body 130. [

Next, as shown in FIG. 5C, the reinforcement rope 124 of the composite PHC pile 100 or the head reinforcement means 140 and the base steel reinforcement are connected to each other, and the foundation concrete is installed to form the final foundation portion 300 .

At this time, the foundation concrete can also act as a filler concrete 125 between the central branch pipe 122 and the inner peripheral surface of the hollow portion of the PHC pile main body 110.

Thus, the composite PHC pile 100 is installed on the ground below the foundation 300, and the load of the foundation 300 is transmitted to the ground through the composite PHC pile 100.

The PHC pile can greatly improve its resistance to the impact of horizontal forces (shear forces) and bending moments such as earth pressure and seismic load.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: composite PHC pile
110: PHC pile body 111: hollow concrete pile
112: steel bar 113: spiral bar
114: Fusing plate
120: upper reinforcement member
121: Lower finish plate 122: Central branch pipe
123: upper hanging bed 124:
124a: vertical reinforcement rods 124b:
125: Filled concrete
130:
131: tip extension plate 132: penetration bit
133: end protrusion bit 134: protrusion reinforcement shoe
135: Cylindrical incision shoe
140: head reinforcement means
141: Finishing plate 142:
143: head reinforcing steel 143a: vertical group
143b: band reinforcing bar 144: bending opening
200: connecting means
210: a monotone fixing plate 220: an intermediate fixing plate
230: connecting ring 240: fixing bolt
250: Horizontal fastening bolt 300: Base portion
H: Perforation hole

Claims (10)

PHC pile body 110; And an upper end reinforcement 120 installed to reinforce the upper end of the PHC pile main body 110,
A center holding tube 122 extending upward from the upper surface of the lower finishing plate 121 by a circular steel pipe; A top hanging bolt 123, which is a bending reinforcing bar extending horizontally on the outer circumferential surface of the upper end of the center paper tube 122 so as to cover the upper surface of the PHC pile main body 110; And the upper reinforcing member 120 is integrated with the PHC pile main body 110 while reinforcing the filler concrete 125 filled in the space by extending into the space between the central branch pipe 122 and the hollow inner peripheral surface of the PHC pile main body 110 And a reinforcing bar (124)
The closed space between the lower finishing plate 121, the center pipe 122 and the inner side surface of the hollow portion of the PHC pile main body 110 is filled with the filled concrete 125 so that the PHC pile main body 110 and the upper reinforcing member 120, Together with the central branch tube 122 and the reinforcement rods 124, to resist the bending moment and the horizontal force generated near the surface of the earth,
The head reinforcement means 140 may be installed on the central branch tube 122 of the upper reinforcement body 120,
A finishing plate 141 formed on the inner side surface of the center paper tube 122 and formed with a folding opening 144 on which an engaging reinforcing bar 142 and a head reinforcing reinforcing bar 143 can be installed;
The lower end of the composite PHC pile 100 is fitted to the opening of the bend opening part 144 and the upper end is bent horizontally so as to be supported on the upper surface of the PHC pile body 110 of the composite PHC pile 100; And a bottom reinforcing bar 143b formed to surround the vertical bar 143a and a vertical bar 143a formed to extend upward and an upper end to be fitted to the open end of the folding bar 144, And a head reinforcing bar (143)
Wherein the stopper plate (141) is inserted into the center stopper tube (122) in a state where the retaining reinforcement (142) and the head reinforcement bar (143) are formed in advance. The method according to claim 1,
The PHC pile main body 110
A steel bar 112 formed inside the hollow concrete pile 111; And a fusing plate (114) formed on the bottom and top surfaces of the PHC pile where the steel bar (112) is fixed after being strained. The method according to claim 1,
The reinforcement rods (124)
A vertical reinforcement rope 124a having a lower end fixed to the upper surface of the lower finishing plate 121 and extending vertically around the center pipe and a band reinforcement rope 124b connecting the vertical reinforcement rope 124a and the center pipe 122 to each other, The upper end of the vertical reinforcement rope 124a is formed to extend upward from the upper surface of the PHC pile main body 110 and the band reinforcement rope 124b is formed to match the height of the center pipe tube 122. [ 3. The method of claim 2,
A tip reinforcement member 130 is further formed at the tip of the PHC pile body 110,
The end reinforcing member 130 is formed so that the fixing plate 114 is supported on the upper surface of the distal end expansion plate 131 and the extended tip end portion of the PHC pile main body 110 is provided with a larger diameter than the fixing plate 114 A distal end extension plate 131 for expanding the supporting ability while making the front end extension plate 131;
The composite PHC pile 100 is inserted into the perforation hole H as a bit protruding downward from the bottom surface of the distal end expansion plate 131 and then the tip of the composite PHC pile 100 is inserted into the perforation hole H And a penetration bit (132) serving to reliably support the tip of the perforation hole (H). 3. The method of claim 2,
A tip reinforcement member 130 is further formed at the tip of the PHC pile body 110,
The end reinforcing member 130 is formed so that the fixing plate 114 is supported on the upper surface of the distal end expansion plate 131 and the extended tip end portion of the PHC pile main body 110 is provided with a larger diameter than the fixing plate 114 A distal end extension plate 131 for expanding the supporting ability while making the front end extension plate 131;
A protruding reinforcing shoe 134 formed at the center of the distal end extension plate 131; And
And a tip protruding bit (133) formed integrally at the tip of the protruding reinforcing shoe (134) in a triangular wedge shape. delete delete The method according to claim 1,
The PHC pile main body 110 is fastened and connected to each other by the connecting means 200,
The connecting means (200)
A stepped fusing plate 210 for allowing the connecting ring 230 to be mounted on the step portion 211 by forming a step portion 211 on the outer peripheral surface side for connecting the PHC pile main body 110; And
A fixing hole 221 through which the fixing hole 212 formed in the step fixing plate 210 is communicated is provided as an intermediate fixing plate for connecting the stepped fixing plates 210 of the both PHC pile main bodies 110 to each other So that one side of the fixing bolt 240 is fastened to the fixing hole 221 and the other side of the fixing bolt 240 is inserted into the fixing hole of the lower single- And an intermediate fixing plate (220) connecting the upper and lower plates
The upper and lower ends of the connection ring 230 are connected to the horizontal fixing holes 231 formed on the outer circumferential surface of the intermediate fixing plate 220 by horizontal fixing bolts 250 passing through the connection rings 230, 210 and 210. The composite PHC pile is connected to the intermediate fixing plate 220 and the step fixing plate 210 by a connection ring 230 so that the intermediate fixing plate 220 and the step fixing plates 210 are coupled to each other. (a) inserting the composite PHC pile 100 of claim 1 into a perforation hole formed in the ground;
(b) using the tip reinforcing member 130 formed at the distal end of the PHC pile main body 110 to allow the tip reinforcing member 130 to penetrate into the tip of the perforation hole;
(c) filling and filling the filled concrete 125 between the central branch pipe 122 of the composite PHC pile 100 and the inner peripheral surface of the hollow portion of the PHC pile main body 110,
Wherein the composite PHC pile (100) is installed on a ground below the foundation (300). 10. The method of claim 9,
Between step (b) and step (c)
Further comprising the step of providing a head reinforcement means (140) on the central branch tube (122) of the upper reinforcement member (120), wherein the head reinforcement means
A finishing plate 141 formed on the inner side surface of the center paper tube 122 and formed with a folding opening 144 on which an engaging reinforcing bar 142 and a head reinforcing reinforcing bar 143 can be installed; The lower end of the composite PHC pile 100 is fitted to the opening of the bend opening part 144 and the upper end is bent horizontally so as to be supported on the upper surface of the PHC pile body 110 of the composite PHC pile 100; And a bottom reinforcing bar 143b formed to surround the vertical bar 143a and a vertical bar 143a formed to extend upward and an upper end to be fitted to the open end of the folding bar 144, A composite PHC pile which is inserted into the center pipe (122) in a state where the retaining bar (142) and the head reinforcing bar (143) are formed on the finish plate (141) Construction method.

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