KR200441567Y1 - Composite pile combined PHC pile and steel pile - Google Patents

Abstract

The present invention relates to a composite pile in which prestressed high strength concrete piles (abbreviated as "PHC piles") and steel pipe piles are bonded. More specifically, even in case of driving stress for ground penetration of piles, The invention relates to a composite pile which prevents breakage of the head of the PHC pile and the ends of the steel pipe pile and increases the bonding force between the PHC pile and the steel pipe pile.

The composite pile of the present invention, the upper pile is composed of a steel pipe pile, the lower pile is a composite pile consisting of PHC pile, at the junction of the PHC pile and the steel pipe pile, the head of the PHC pile, a circular head protection plate is Integrally installed; A coupler formed integrally with a lower end portion of the steel pipe pile, wherein the coupler includes a circular reinforcement plate formed in a circular frame shape and coupled with the head protection plate, and a vertical vertical reinforcement member coupled to the circular reinforcement plate vertically; In the hollow of the PHC pile and the steel pipe pile, a connecting reinforcing member having a vertical reinforcing bar and a lower plate provided at an end of the vertical reinforcing bar to close the hollow section of the PHC pile is the PHC pile and the steel pipe pile. Continuous across the hollow sides of the; The upper space of the lower plate has a structure that is filled with filled concrete so that the vertical rebar is embedded.

Composite pile, PHC pile, steel pipe pile, coupler, rebar member

Description

Composite pile combined PHC pile and steel pile}

1 is a perspective view showing the cutting of the junction of the PHC pile and the steel pipe pile in order to show the configuration of the composite pile according to the present invention.

2 is an exploded perspective view of the composite pile in the present invention.

Figure 3 is a schematic perspective view showing one embodiment of a coupler provided in the present invention.

Figure 4 is a schematic exploded perspective view showing the configuration of the connecting rebar member provided in the present invention.

Figure 5 is a cross-sectional view of the PHC pile and steel pipe pile junction showing a state in which the connecting reinforcing member shown in FIG.

FIG. 6 is a detail of circle A in FIG. 5.

FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6.

FIG. 8 is a cross-sectional view taken along the line C-C of FIG. 5.

9 is a perspective view showing a process of coupling the steel pipe pile to the upper portion of the PHC pile is installed in the composite pile according to the present invention.

* Explanation of Signs of Major Parts of Drawings *

10: PHC pile (prestressed high strength concrete pile)

20: steel pipe pile

30: coupler

The present invention relates to a composite pile in which a prestressed high strength concrete pile (hereinafter, abbreviated as "PHC pile") and a steel pipe pile are integrally formed, and more specifically, a pier for underground penetration of the pile, The even distribution of the driving stress prevents the breakage of the head of the PHC pile and the end of the steel pipe pile, and a new type of composite pile which increases the coupling force between the PHC pile and the steel pipe pile.

PHC piles are widely used because of their low material costs and high tip bearing capacity. However, PHC piles have the disadvantage of being weak in shear and bending moments. On the other hand, the steel pipe pile is uniform in the material of the pile is uniform resistance to load over the entire length of the pile, in particular, it has the advantage of excellent resistance to shear and bending moment, but the material cost is expensive.

On the other hand, when calculating the bending moment according to the depth acting on the pile installed on the ground, there are differences depending on the upper structure supported by the pile, the ground environment, and the pile length, but generally the bending stress and the vertical stress act on the top of the pile, Only vertical stress acts on the bottom. Therefore, considering the bending moment according to the ground depth and the characteristics of each pile, the upper pile part near the surface uses steel pipe piles with strong resistance to shear and bending moment, and at the lower depth (lower pile part), the tip bearing capacity is excellent. In order to use PHC piles, which are relatively inexpensive in material cost, a composite pile combining PHC piles and steel pipe piles has been proposed.

Conventional composite piles, by installing a cover plate (head protection plate) made of steel on the head of the PHC pile constituting the lower pile, and welding the lower end of the steel pipe pile constituting the upper pile to the cover plate of the PHC pile head It has a simple structure that combines the pile and the steel pipe pile at the top. However, such a conventional composite pile is applied to the steel cover plate due to the concentrated stress generated at the end of the steel pipe pile relatively small compared to the cross-sectional area of the steel cover plate not only causes deformation of the steel cover plate, Deformation of the steel pipe pile end occurs by the reaction force, there is a problem that the PHC pile head is broken.

In addition, the conventional composite pile has a structure in which the lower end portion of the steel pipe pile is simply welded on the steel cover plate, so that there is a limit in the coupling force between the PHC pile and the steel pipe pile, so that the joint between the two piles is particularly effective in the shear force and the bending moment. There is a problem of becoming vulnerable.

The present invention was developed to solve the problems of the prior art as described above, specifically, in forming a composite pile by connecting the PHC pile and the steel pipe pile up and down, evenly the driving stress generated during the underground penetration of the pile It aims to prevent local breakage of the head of the PHC pile and the bottom of the steel pipe pile.

In addition, the present invention aims to increase the bonding force of the joint of the PHC pile and the steel pipe pile, to increase the joint stability of the composite pile.

In order to achieve the above object, the present invention, the upper pile is composed of a steel pipe pile, the lower pile is a composite pile consisting of PHC pile, at the junction of the PHC pile and the steel pipe pile, the head of the PHC pile, round Head protection plate is integrally installed; A coupler formed integrally with a lower end portion of the steel pipe pile, wherein the coupler includes a circular reinforcement plate formed in a circular frame shape and coupled to the head protection plate, and a vertical vertical reinforcement member coupled to the circular reinforcement plate vertically; In the hollow of the PHC pile and the steel pipe pile, a connecting reinforcing member having a vertical reinforcing bar and a lower plate provided at an end of the vertical reinforcing bar to close the hollow section of the PHC pile is the PHC pile and the steel pipe pile. Continuous across the hollow sides of the; The upper space of the lower plate provides a composite pile of PHC piles and steel pipe piles, characterized in that the vertical reinforcing reinforcing bar has a structure that is filled with filled concrete.

In the composite pile, a cutout is formed in the vertical reinforcement of the coupler, a wedge is inserted into the cutout, the outer peripheral surface of the vertical reinforcement can be in close contact with the inner peripheral surface of the steel pipe pile.

In addition, the guide ring that extends over the head protection plate of the PHC pile may be installed to surround the vertical reinforcing bar.

In addition, the upper end of the vertical reinforcing bars, when the steel pipe pile is placed on the PHC pile, the upper portion may be bent inclined toward the central axis of the pile to guide the insertion of the steel pipe pile.

In the following, with reference to the accompanying drawings of the specification will be described in detail the configuration and effect of the present invention.

1 is a perspective view showing the cut out of the junction of the PHC pile 10 and the steel pipe pile 20 to show the configuration of the composite pile 1 according to the present invention. 2 is an exploded perspective view of the composite pile 1 in the present invention.

Referring to FIG. 1, the composite pile 1 according to the present invention has a structure in which a lower pile portion made of a PHC pile 10 and an upper pile portion made of a steel pipe pile 20 are coupled. In order to join the PHC pile 10 and the steel pipe pile 20, a coupling hole 30 is provided at the lower end of the steel pipe pile 20, and the PHC pile 10 and the steel pipe pile 20 are provided. In the hollow of the connecting reinforcing member 40 is disposed continuously.

The head of the PHC pile 10 to be joined to the steel pipe pile 20 has a shape corresponding to the head of the PHC pile 10 and is provided with a head protection plate 11 made of steel, the head protection plate 11 ) Is installed on the concrete at the time of manufacture of the PHC pile 10 is integrated with the PHC pile 10. In addition, the head protection plate 11 is provided with a hollow portion, so that the interior of the PHC pile 10 and the steel pipe pile 20 can communicate with each other through the hollow portion.

On the other hand, the steel pipe pile 20 forming the upper pile portion is bonded to the head of the PHC pile (10). The inner diameter of the steel pipe pile 20 is larger than the inner diameter of the PHC pile 10. That is, the cross-sectional area of the steel pipe pile 20 is smaller than the cross-sectional area of the PHC pile 10. Accordingly, a concentrated stress is generated at the lower end of the steel pipe pile 20 having a small cross-sectional area during the ground penetration of the pile, the concentrated stress of the head protection plate 11 in contact with the end of the steel pipe pile 20 It is delivered intensively to a part, causing local deformation of the head protection plate 11, whereby damage to the PHC pile 10 occurs. In addition, the reaction force of the concentrated stress is transmitted to the end of the steel pipe pile 20 again to cause deformation, such as distortion of the end of the steel pipe pile (20). The present invention is provided with a coupler 30 has the following configuration at the lower end of the steel pipe pile 20 to overcome this problem.

The coupler 30 includes a circular reinforcing plate 31 having a circular frame shape, and a cylindrical vertical reinforcing member 32 that is vertically coupled to the circular reinforcing plate 31. The circular reinforcement plate 31 preferably has a shape corresponding to the shape of the head protection plate 11 of the PHC pile 10. On the other hand, as will be described later in this specification, when the connecting reinforcing member 40 having a guide ring 42 is inserted into the hollow interior of the PHC pile 10, the inner diameter of the circular reinforcement plate 31 is It is made larger than the inner diameter of the head protection plate (11).

The vertical reinforcing member 32 has a cylindrical shape, the outer circumferential surface is in close contact with the inner circumferential surface of the steel pipe pile 20, the end is in close contact with the one surface of the circular reinforcement plate 31 to weld the circular reinforcement plate It is integrated with (31). If necessary, as shown in the drawing for reinforcement, one or more vertical ribs 33 may be further provided between the circular reinforcement plate 31 and the inner circumferential surface of the vertical reinforcement member 32.

3 is a schematic perspective view showing an embodiment of the coupler 30, in the present invention, the outer circumferential surface of the vertical reinforcement 32 of the coupler 30 is of the steel pipe pile 20 It is preferable to have a close contact structure using the wedge 34 so as to be in close contact with the inner circumferential surface. That is, as shown in the figure, when the cutout portion 35 is formed in the vertical reinforcement 32, and the wedge 34 is put in the cutout 35, the outer peripheral surface of the vertical reinforcement 32 is the steel pipe It is in close contact with the inner circumferential surface of the pile 20. As such, the vertical reinforcement 32 is in close contact with each other, so that the effect of reinforcing the lower end of the steel pipe pile 20 and the local deformation and / or breakage prevention effect of the lower end of the steel pipe pile 20 by the coupler 30 are more exerted. In FIG. 3, the vertical reinforcement 32 is illustrated as having one cutout 35 formed therein, but the number of the cutouts 35 is not limited.

The upper surface of the vertical reinforcement 32 and the inner surface of the steel pipe pile 20 in the state that the outer peripheral surface of the vertical reinforcement 32 is inserted into the interior of the steel pipe pile 20 so as to be in close contact with the inner peripheral surface of the steel pipe pile 20 This can be welded.

As such, in a state in which the coupling hole 30 is provided at the lower end of the steel pipe pile 20, the steel pipe pile 20 is installed at the upper end of the PHC pile 10 so as to provide a circular reinforcing plate of the coupling hole 30 ( 31) and the head protector plate 11 of the PHC pile 10 are integrated by joining by a method such as welding, so that the steel pipe pile 20 and the PHC pile 10 are integrated. At this time, in order to reinforce the joint of the steel pipe pile 20 and the PHC pile 10, the connecting reinforcing member 40 is disposed over the steel pipe pile 20 and PHC pile (10).

4 is a schematic exploded perspective view showing the configuration of the connecting reinforcing member 40, Figure 5 is a cross-sectional view of the junction showing a state in which the connecting reinforcing member 40 is disposed. FIG. 6 shows a detail of circle A of FIG. 5. FIG. 7 is a cross sectional view taken along the line B-B of FIG. 6, and FIG. 8 is a cross sectional view taken along the line C-C of FIG. 5. 9 is a perspective view illustrating a process of coupling the steel pipe pile 20 to the upper portion of the PHC pile 10 in the composite pile 1 according to the present invention, the connecting reinforcing member 40 is installed.

As shown in the figure, the connecting rebar member 40 is a vertical reinforcing bar 41, a band reinforcing bar 44, a guide ring 42 for the installation of the connecting reinforcing member 40, and the vertical reinforcing bar It is provided with the lower plate 43 which is provided in the edge part of 41, and closes the hollow cross section of the PHC pile 20. As shown in FIG.

The vertical reinforcing bar 41 has a shape in which its upper portion is bent toward the central axis of the composite pile 1. The guide ring 42 is installed to surround the vertical reinforcing bar 41, the guide ring 42 is to be described later, so that the connecting reinforcing member 40 easily spans the upper end of the PHC pile (10) To be installed. A lower plate 43 is coupled to the lower end of the vertical rebar 41. When the continuous reinforcing member 40 is installed in the joint portion, the lower plate 43 is placed at a position of a predetermined depth inside the hollow of the PHC pile 10 to close the hollow cross section of the PHC pile 10, It forms a space in which the filling concrete is filled. In the embodiment shown in the drawings, the lower plate 43 is installed on the lower end of the vertical reinforcing bar 41 by a nut, but is not limited thereto, and the end of the vertical reinforcing bar 41 is bent and bent. The lower plate 43 may be placed on the lower portion, or the lower plate 43 may be installed at the lower end of the vertical reinforcing bar 41 by using another method such as welding.

The connecting reinforcing member 40 having such a configuration is that the vertical reinforcing bar 41 is fitted to the hollow of the head protection plate 11 and the PHC pile 10 of the PHC pile 10, wherein the guide ring 42 is over the head protection plate 11 of the PHC pile 10 so that the connecting reinforcing member 40 is the upper end of the PHC pile 10, that is, the PHC pile 10 and the steel pipe pile 20 It is arranged at the junction. It is also preferable to weld the guide ring 42 to the head protection plate 11 so that the connecting reinforcing member 40 does not move.

After the connecting rebar member 40 is installed in this way, as shown in FIG. 9, the steel pipe pile 20 to which the coupling tool 30 is coupled is inserted onto the connecting rebar member 40 to allow the PHC pile 10 to be installed. ) Will be placed on. At this time, since the inner diameter of the circular reinforcement plate 31 of the coupler 30 is smaller than the inner diameter of the head protection plate 11, the guide ring 42 and the circular reinforcement plate 31 do not interfere with each other. .

On the other hand, in the present invention, since the upper portion of the vertical reinforcing bar 41 of the connecting rebar member 40 is bent to be inclined toward the central axis of the pile, as shown in Figure 9 the steel pipe pile 20 to the PHC pile 10 When positioned at the top of the), the vertical reinforcing bar 41 serves as a guide of the steel pipe pile 20, the installation work of the steel pipe pile 20 is facilitated, and occur during the installation process of the steel pipe pile 20 It is possible to prevent deformation such as bending of the vertical reinforcing bar 41 due to possible collisions.

When the steel pipe pile 20 is installed on the PHC pile 10 in this way, the lower surface of the circular reinforcement plate 31 of the coupling hole 30 is in close contact with the head protection plate 11 of the PHC pile 10, The circular reinforcing plate 31 and the head protection plate 1 is welded to the edge. Filled concrete is poured into the joint portion of the steel pipe pile 20 and PHC pile 10, the concrete is filled in the space above the lower plate 43, the connecting reinforcing member 40 is embedded in the concrete, such The stiffness of the joint of the steel pipe pile 20 and the PHC pile 10 is further increased by the filled concrete.

As described above, according to the present invention, when manufacturing the composite pile by combining the steel pipe pile and PHC pile, using the coupling sphere 30, in particular, the vertical reinforcement 32 of the coupling sphere 30 is wedge As the inner circumferential surface of the steel pipe pile 20 is brought into close contact by the action of the steel pipe pile 20, the driving force is evenly transmitted to the entire cross section of the circular reinforcement plate 31, and the lower portion of the steel pipe pile 20 that may occur during driving is exerted. There is an effect of preventing the deformation of the steel pipe pile 20 and the PHC pile 10 when the coupling is guided to the exact coupling position of the steel pipe pile 20 by guiding precisely the center axis of the two piles and the driving stress and There is an effect of transmitting the vertical stress of the structure evenly in the circumferential direction.

In addition, since the cross section of the circular reinforcement plate 31 has a shape corresponding to the cross section of the head protection plate 11, the driving stress transmitted to the circular reinforcement plate 32 is applied to the entire cross section of the head protection plate 11. It is transmitted evenly, thereby preventing the occurrence of concentrated stress in the head of the PHC pile 10 to effectively prevent local breakage of the head of the PHC pile 10. Therefore, according to the present invention, there is an effect of evenly dispersing the driving stress generated during the underground penetration of the pile to prevent local breakage of the PHC pile and the steel pipe pile, increase the bonding force of the PHC pile and the steel pipe pile, It is effective to increase the stability.

On the other hand, in the present invention, since the connecting reinforcing member is installed at the joint of the steel pipe pile and the PHC pile, and the filling concrete is filled so that the connecting reinforcing member is buried, the effect of increasing the rigidity of the joint is exerted. In particular, the vertical reinforcing bar of the connecting reinforcing member is bent in the direction of the center of the upper reinforcing bar, when the steel pipe pile 20 is located above the PHC pile 10, the vertical reinforcing bar 41 is the steel pipe By acting as a guide of the reinforcing bar 20, the coupling operation is facilitated, the deformation of the bending of the vertical reinforcing bar 41, which may occur in the coupling process is prevented is exhibited.

Claims (4)

The upper pile is composed of a steel pipe pile 20, the lower pile is a composite pile consisting of a PHC pile 10, at the junction of the PHC pile 10 and the steel pipe pile 20, On the head of the PHC pile 10, a circular head protection plate 11 having a hollow portion is integrally installed; Coupler comprising a circular reinforcement plate 31 made of a circular frame shape and coupled to the head protection plate 11 and a cylindrical vertical reinforcement member 32 coupled perpendicularly to the circular reinforcement plate 31. 30 is integrally provided at the lower end of the steel pipe pile 20; In the hollow of the PHC pile 10 and the steel pipe pile 20, a vertical reinforcing bar 41 and a lower plate provided at the end of the vertical reinforcing bar 41 to close the hollow cross section of the PHC pile 20 A connecting reinforcing member 40 having 43 is continuously disposed across both hollow sides of the PHC pile 10 and the steel pipe pile 20; Composite pile of PHC pile and steel pipe pile, characterized in that the upper space of the lower plate 43 has a structure that is filled with the filling concrete so that the vertical reinforcing bar 41 is embedded. The method of claim 1, A cutout 35 is formed in the vertical reinforcement 32 of the coupler 30, The wedge 34 is inserted into the cutout 35 so that the outer circumferential surface of the vertical reinforcement 32 is in close contact with the inner circumferential surface of the steel pipe pile 20. The method according to claim 1 or 2, The composite ring of PHC piles and steel pipe piles, characterized in that the guide ring 42 is provided to cover the top of the head protection plate 11 of the PHC pile 10 to surround the vertical reinforcing bar (41). The method according to claim 1 or 2, The upper end of the vertical reinforcing bar 41, when the steel pipe pile 20 is placed on the PHC pile 10, the upper portion is bent inclined toward the central axis of the pile to guide the insertion of the steel pipe pile 20 The composite pile of PHC pile and steel pipe pile characterized by the above.

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