KR20190143420A - Reinforcement Structure of PHC Pile, PHC Pile having such Reinforcement Structure, and Constructing Method for such PHC Pile - Google Patents

Abstract

The present invention relates to a reinforcing structure of PHC piles using hollow reinforcing assemblies and a construction method of PHC piles having the same. The present invention reduces material costs and improves construction economics by preventing the use of oversized reinforcing steel pipes by arranging a reinforcing assembly having a reinforcing steel net on the outside of the reinforcing steel pipe in the hollow of the PHC pile and integrating it with the PHC pile by using a bonding filler, primarily reinforcing bending and shear strength of PHC piles using the reinforcing steel pipes, and satisfying the flexural and shear strength, which are not sufficient by the reinforcing steel pipes, by using reinforcing steel nets. Furthermore, it is possible to construct an enlarged foundation in which the head reinforcement part of the reinforcing steel net protruding from the head of the PHC pile is embedded, thereby easily securing the integrity of PHC piles and enlarged foundation.

Description

Reinforcement structure of PHC pile by hollow installation of reinforcement assembly, PHC pile and its construction method {Reinforcement Structure of PHC Pile, PHC Pile having such Reinforcement Structure, and Constructing Method for such PHC Pile}

The present invention relates to a technique for reinforcing the bending strength and shear strength of a PHC pile by arranging a reinforcing steel pipe in the field for an upper section of a PHC pile (Prestressed High Strength Concrete Pile) having a large bending moment. The reinforcing assembly, which is installed with the reinforcing steel net on the outside of the steel pipe, is placed in the hollow of the PHC pile and integrated with the PHC pile by the coupling filler to reinforce the bending and shear strength of the PHC pile primarily by the reinforcing steel pipe. The flexural and shear strengths, which are not sufficient by themselves, are satisfied by the reinforcing bar network, which prevents the use of oversized reinforcing steel pipes, thereby reducing material costs and improving construction economics. The reinforcement part of the head is embedded in the form of an enlarged foundation, which enables the expansion of PHC piles and The integrity of a secure foundation for easily be directed to a "of the PHC pile according to the installation of a hollow reinforcement structure reinforcing assembly and the PHC pile and the construction method having the same".

When an external force (load) acts on the pile while the pile is buried in the ground, a large bending moment in addition to the vertical compression force acts on the pile in a section from the ground to a predetermined depth. PHC piles in which hollows are formed in the direction in which the piles extend are inexpensive compared to steel pipe piles and have a large compressive force that resists axial force, and thus are mainly used in structural foundations in which a compressive force is applied. Since PHC piles are made of concrete, they have great stiffness against compressive forces, but they are somewhat weak against bending moments and horizontal forces. As an alternative to this, the prior art, such as Korean Patent Registration No. 10-1071810, proposes a composite pile in which a steel pipe pile is disposed at an upper portion and a PHC pile is disposed at a lower portion thereof in a vertical direction.

Another alternative is to install reinforcing steel pipes in the hollows in the upper sections of the PHC piles and reinforcing steel pipes in the upper sections of the PHC piles so that they can exert this sufficient rigidity against the large bending moments and horizontal forces acting on the upper sections when the PHC piles are constructed underground. Has been proposed to improve flexural strength and shear strength by integrating with a PHC pile.

 As the external force is applied to the PHC piles on the ground, the magnitudes of the bending moments and shear forces acting on the PHC piles vary with the depth from the ground. Figure 1 is a schematic diagram showing the bending moment acting on the pile when an external force is applied to the pile installed on the ground. As shown in Figure 1, the bending moment acting on the pile is changed according to the depth from the ground, in the reinforcement of the PHC pile by installing a reinforcing steel pipe, regardless of the bending moment and shear force that changes depending on the depth from the ground When reinforcing steel pipes of the same diameter are uniformly arranged, high reinforcing steel pipes are excessively used in sections with small bending moments and shear forces. For example, when a reinforcing steel pipe having a diameter that can have a bending strength of a bending moment of size A in FIG. 1 is selected and installed in a PHC pile, the bending moment of a size indicated by B in FIG. Unnecessarily excessive reinforcing steel pipe is installed is a problem that the expensive material is wasted and economical low.

Overlooking that the flexural and shear strengths required for the piles vary with the depth of the ground, reinforcing steel pipes of the same specification, ie the same diameter and thickness, and the same material are hollowed over the entire upper section of the PHC pile. In the case of disposing inside, if expensive steel pipes are used excessively, the disadvantage is that the economical efficiency is lowered due to the increase in the material cost.

Republic of Korea Patent Publication No. 10-1071810 (2011.10.10 notification).

The present invention was developed in order to overcome the limitations of the prior art as described above, the present invention in the reinforcement by increasing the bending strength and shear strength of the PHC pile in the upper section of the PHC pile, reinforcement pipe of relatively small diameter PHC Lack of reinforcement of bending strength and shear strength, which is not enough to install reinforcing steel pipe, is made by reinforcing steel pipe arranged in hollow of PHC pile in the form of wrapping the reinforcing steel pipe. By doing so, it is possible to prevent excessive reinforcement by using a reinforcing steel pipe with a diameter larger than the magnitude of the bending moment and shear force acting on the actual PHC pile, thereby reducing the material cost and improving the economics. For the purpose of

Furthermore, an object of the present invention is to provide a technique for easily securing the integration of the PHC pile and the expansion foundation when constructing the expansion foundation by placing concrete on top of the PHC pile.

In the present invention, to achieve the above problems, install PHC pile in the ground; In the hollow of the PHC pile, it consists of a tubular shape including a bottom plate which blocks all or part of the hollow section of the PHC pile, a reinforcing steel pipe standing vertically on the bottom plate, a plurality of vertical reinforcing bars and a band reinforcing bar connecting the same. Positioning a reinforcing assembly including a reinforcing steel net installed to surround the reinforcing steel pipe; Placing and hardening the coupling filler in the gap between the reinforcing steel pipe and the hollow inner surface of the PHC pile upwards of the bottom plate so that the reinforcing assembly is embedded, thereby integrally combining the PHC pile and the reinforcing assembly; Provided is a method for constructing a PHC pile, characterized in that the construction of the PHC pile in the state of bending strength and shear strength reinforced by the reinforcing assembly and the filler filler.

In addition, the present invention provides a PHC pile constructed by the above-described construction method, and provides a reinforcement structure of the PHC pile having the characteristics of the above-described construction method.

In the construction method of the present invention, the reinforcing structure and the PHC pile having the same, the reinforcing reinforcing bar has a main body that surrounds the exterior of the reinforcing steel pipe, and an expanded cross section larger than the cross section of the main body, It may be configured to include a head reinforcement extending to protrude over the head of the PHC pile embedded in the enlarged base, and furthermore, the vertical reinforcement of the reinforcing reinforcing bar is bent outwardly in the first bend and then inclined to the second bend By bending back and extending vertically upward, the head reinforcement part of the reinforcing steel network is composed of a tapered shape in which a cylindrical cross-sectional size increases toward the top, and an upper part in which the vertical reinforcing bars are bent again and extended vertically. ; When the rebar network is inserted into the hollow of the PHC pile, the portion existing between the first bent portion and the second bent portion of the rebar network may have a configuration that spans the top hollow inlet of the PHC pile.

In addition, in the construction method of the present invention, the reinforcing structure and the PHC pile having the same, when the bonding filler is poured, the bonding filler may also be hardened by placing the bonding filler in the inner space of the reinforcing steel pipe.

In the present invention, by installing a conventional PHC pile in the ground at the construction site, by placing a reinforcing assembly in the hollow and integrated with a filler filling, there is an advantage that the bending strength and shear strength reinforcement work of the PHC pile can be easily made. .

Particularly, in the present invention, two members of the reinforcing steel pipe and the reinforcing steel mesh share the bending strength and shear strength reinforcement of the PHC pile, and the reinforcing steel mesh is very easy to manufacture so as to have a desired degree of reinforcing capacity. The reinforcement demand that is made by the reinforcing steel pipe and the reinforcing demand that is insufficient by the reinforcing steel pipe is satisfied according to the ground depth through the reinforcing steel pipe and the reinforcing steel net. The reinforcement requirements of the flexural strength and shear strength of the PHC piles can be optimally met.

Therefore, according to the present invention, it is possible to eliminate unnecessary excessive reinforcement and consequent waste caused by the use of uniformly large diameter reinforcing steel pipes, and the advantage of being able to construct PHC piles very economically.

Figure 1 is a schematic diagram showing the bending moment acting on the pile when an external force is applied to the pile installed on the ground.
2 to 4 are schematic cross-sectional views sequentially showing each step of the method for constructing a PHC pile according to the first embodiment of the present invention.
5 is a schematic perspective view showing a form in which a reinforcing steel pipe and a bottom plate are combined to form a reinforcing assembly.
6 is a schematic perspective view of a reinforcing steel mesh according to an embodiment of the present invention.
FIG. 7 is a schematic perspective view showing that the reinforcing steel mesh shown in FIG. 6 is covered on the outside of the reinforcing steel pipe.
FIG. 8 is a schematic perspective view showing a state in which a reinforcing assembly is made in advance following FIG. 7.
9 is a schematic enlarged perspective view showing only the upper portion of the state where the reinforcing steel mesh is covered on the outside of the reinforcing steel pipe.
FIG. 10 is a schematic cross-sectional view corresponding to FIG. 4 showing a state in which a filling filler is filled in the reinforcing steel pipe according to the second embodiment of the present invention.
11 is a schematic enlarged cross-sectional view showing a state in which the enlarged foundation is constructed on top of the PHC pile installed according to the present invention.
12A to 12D are schematic cross-sectional views sequentially illustrating a process of constructing the PHC pile of the present invention by separately installing the bottom plate, the reinforcing steel pipe, and the reinforcing steel net.
FIG. 13 is a schematic perspective view showing an example of a configuration for inserting the bottom plate into the hollow of the PHC pile. FIG.
14 is a schematic perspective view showing that the reinforcing steel pipe is previously coupled to the bottom plate shown in FIG.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described. Although the present invention has been described with reference to the embodiments shown in the drawings, this is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited.

2 to 4 show schematic cross-sectional views sequentially illustrating the respective steps of the method for constructing the PHC pile 1 according to the first embodiment of the present invention, respectively.

In the construction method of the PHC pile 1 according to the present invention, the PHC pile 1 is installed in the ground as shown in FIG. 2, and subsequently, the bottom plate 4 and the reinforcing steel pipe 2 as shown in FIG. 3. After placing the reinforcing assembly consisting of the reinforcing steel mesh (3) in the hollow of the PHC pile (1), the shrinkage in the space between the hollow inner surface of the reinforcing steel pipe (2) and PHC pile (1) as shown in FIG. It includes the process of pouring the bonding filler 5, such as mortar, concrete.

In the installation of the PHC pile 1 in the ground, the insertion hole may be drilled in the ground in advance and the PHC pile 1 may be inserted into the insertion hole, but the PHC pile 1 may be directly driven to drive the PHC pile 1. Intrusive placement can also be made in this underground. When the PHC pile 1 is installed in the ground, it is preferable that the head of the PHC pile 1 protrudes above the ground for integration with the enlarged foundation 6. In the figure, reference numeral 11 denotes the tension member 11 disposed in the PHC pile 1.

In the present invention, the reinforcing assembly is inserted into the hollow of the PHC pile 1, the reinforcing assembly is configured to include a reinforcing steel pipe (2), reinforcing steel mesh (3) and the bottom plate (4). FIG. 5 is a schematic perspective view showing a form in which a reinforcing steel pipe 2 and a bottom plate 4 are combined to form a reinforcing assembly. As described above, after the reinforcing assembly is positioned in the hollow of the PHC pile 1, the filler filler 5 is filled between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1, and the bottom plate 4 is bonded filler. In order to limit the height at which 5 is filled, the gap between the hollow inner surface of the PHC pile 1 at the lower end of the reinforcing steel pipe 2 or the hollow cross section of the PHC pile 1 is blocked. When the hollow interior of the reinforcing steel pipe 2 is filled with concrete or the like, the bottom plate 4 is made of a plate member that blocks all of the hollow cross section of the PHC pile 1. However, when the hollow inside of the reinforcing steel pipe 2 is empty, the bottom plate 4 may be formed in a band shape having a predetermined width so as to block only between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1. .

Reinforcing steel pipe (2) is installed on the upper surface of the bottom plate (4) is installed, the reinforcing steel pipe (2) is a pipe-shaped member made of steel, when the reinforcement assembly is inserted into the hollow interior of the PHC pile (1), Reinforcing steel pipe (2) is located in the upper section of the PHC pile (1) to perform the function of primarily reinforcing the bending strength and shear strength of the PHC pile. Although the cross section of the reinforcing steel pipe 2 is illustrated in the figure in a circular shape, it may have a cross section such as an ellipse or a polygon. The cross-sectional size of the reinforcing steel pipe (2) is smaller than the hollow cross-sectional size of the PHC pile (1), so that the hollow inner surface and reinforcement of the PHC pile (1) with the reinforcing steel pipe (2) located in the hollow of the PHC pile (1) There is a gap between the outer surfaces of the steel pipe (2).

6 shows a schematic perspective view of a rebar network 3 according to an embodiment of the invention. FIG. 7 is a schematic perspective view showing that the tubular reinforcing steel mesh 3 shown in FIG. 6 is covered on the outside of the reinforcing steel pipe 2, and FIG. 8 is followed by the reinforcing assembly in advance. A schematic perspective view is shown showing the made state. 9 shows a schematic enlarged perspective view showing only the upper part of the state where the reinforcing steel mesh 3 is covered on the outside of the reinforcing steel pipe 2.

The reinforcing steel net (3) is a member disposed in the hollow of the PHC pile (1) so as to surround the reinforcing steel pipe (2) in a tubular shape including a plurality of vertical reinforcing bars (301) and a band reinforcing bars (302) connecting them. . In the state where the reinforcement of the bending force and shear strength of the PHC pile 1 is not sufficient by the installation of the reinforcing steel pipe 2 alone, the reinforcing steel mesh 3 is additionally installed to compensate for the deficiency of the bending strength and shear strength reinforcement. do. The reinforcing steel net 3 may basically be configured to have only the main body 32 surrounding only the reinforcing steel pipe 2, but as illustrated in the drawing, the reinforcing steel net 3 is embedded in the expanding base 6 and the expansion base 6 and the PHC. It is also preferable to have the structure which the head reinforcement part 31 which connects between the heads of the pile 1 is further formed continuously vertically upward of the main-body part 32. FIG. As described above, when the reinforcing steel mesh 3 has a configuration in which the head reinforcement part 31 is more integrally provided above the main body part 32, the head reinforcement part 31 is located above the head of the PHC pile 1. The protruding position is positioned so that the head reinforcement portion 31 is embedded in the enlarged foundation 6 when the enlarged foundation 6 is installed on the PHC pile 1. This head reinforcement part 31 is to exhibit the reinforcement function for the head and the enlarged base 6 of the PHC pile (1), so no additional additional head reinforcement work is required, and the enlarged base of the PHC pile (1) The advantage that the unity with (6) can be ensured more easily is exhibited.

In addition to the above configuration, the head reinforcement portion 31 is preferably configured to be expanded to have a larger cross section than the main body portion (32). Specifically, as shown in FIG. 9, the head reinforcement part 31 has a tapered shape in which the vertical reinforcing bar 301 is bent outward and the cylindrical cross-sectional size increases as the upper part is bent upward, and the vertical reinforcing bar 301 is bent again. It can be made of an upper portion extending vertically upward. For convenience, the portion where the vertical reinforcing bars 301 of the reinforcing steel mesh 3 are folded outward to have the enlarged head reinforcement portion 31 is referred to as a “first bending portion D1” and the first bending portion D1. The portion that is bent so that the vertical reinforcing bar 301 is erected in the vertical direction again above) is referred to as "second bending portion (D2)". In the case of the reinforcing steel mesh 3 having such a configuration, the vertical reinforcing bars 301 are bent at the first bent portion D1 and inclined upwardly extended and then bent again at the second bent portion D2 and vertically extended upward. do. In this configuration, the reinforcing steel mesh 3 has a larger cross-sectional size above the second bent portion D2 than the cross-sectional size under the first bent portion D1. As such, when the head reinforcement part 31 provided in the reinforcing steel mesh 3 has a tubular cross section of an enlarged size, an enlarged foundation 6 is constructed on the upper end of the PHC pile 1 to establish the head reinforcement part 31. ) Is embedded in the enlarged foundation (6), there is an advantage that can be exerted greater flexural strength through the enlarged cross-section.

As illustrated in FIGS. 7 and 8, the reinforcing steel pipe 2 is inserted into the center of the main body part 32 in a state where the reinforcing steel pipe 2 is vertically mounted and installed on the bottom plate 4. By installing 3) and combining the lower end of the reinforcing steel mesh 3 with the upper surface of the bottom plate 4, the reinforcing assembly can be assembled in advance. When the reinforcing assembly is manufactured in advance by assembling and combining the reinforcing steel pipe 2, the reinforcing steel mesh 3 and the bottom plate 4, the lower portion of the reinforcing assembly, that is, the portion where the reinforcing steel pipe 2 is present (reinforcing steel bars) The main body of the net) is inserted into the hollow of the PHC pile (1).

In the state where the lower part of the reinforcing assembly is inserted into the hollow of the PHC pile 1 as shown in FIG. 3, there is a gap between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1 and the reinforcing steel mesh ( The body portion 32 of 3) is sandwiched between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1. When the head reinforcement part 31 having the enlarged diameter cross section is provided in the reinforcing bar network 3 as illustrated above, if necessary, the head reinforcement part may be properly adjusted by adjusting the cross-sectional size of the head reinforcement part 31. When the lower part is inserted into the hollow of the PHC pile 1, the portion existing between the first bent portion D1 and the second bent portion D2 of the reinforcing steel mesh 3 is the upper hollow inlet of the PHC pile 1. It can also be over. According to this configuration, it is possible to exclude the use of a separate binding member in inserting and installing the reinforcing assembly into the hollow of the PHC pile 1, and thus it is very easy to install the reinforcing assembly. . However, the present invention is not necessarily limited thereto, and when the reinforcing bar net 3 does not have the head reinforcing part 31, further, the reinforcing bar net 3 has a head reinforcing part 31 having an enlarged diameter. Even in this case, by reducing the cross-sectional size of the head reinforcement portion 31 and installing the reinforcing assembly suspended by a separate member, the reinforcing steel mesh 3 does not span the upper hollow inlet of the PHC pile 1 The lower part of the reinforcing assembly may be inserted into the hollow of the PHC pile 1.

After the reinforcing assembly is inserted into the hollow of the PHC pile 1, the reinforcing steel pipe 2 is embedded so that the main body 32 of the reinforcing steel mesh 3 surrounding the reinforcing steel pipe 2 is embedded as shown in FIG. ) And filling filler 5, such as non-contraction mortar and concrete, between the hollow inner surface of the PHC pile 1. In the present invention, since the reinforcing steel pipe (2) having a relatively small diameter is used, between the reinforcing steel pipe (2) and the hollow inner surface of the PHC pile (1), the combined filler (5) made of concrete using mortar as well as coarse aggregate Can be filled using an injection lake. Therefore, there is an advantage that the selection range of the material that can be used as the bonding filler (5) is widened. In particular, when the concrete can be poured between the hollow inner surface of the reinforcing steel pipe (2) and the PHC pile (1) when combining the concrete for the expansion base (6) when building the expansion base (6) as will be described later It can be used as the filler (5), and thus can be carried out at the same time the filling operation of the combined filler (5) and the construction of the expansion base (6) also exhibits the advantage that can further increase the construction efficiency .

By such a configuration, since the reinforcing steel pipe 2 and the reinforcing steel mesh 3 are disposed inside the hollow of the PHC pile 1 to have a reinforcing structure integrated by the coupling filler 5, the PHC pile 1 is It has a large flexural and shear strength. As described above, as the external force is applied to the PHC pile 1 installed on the ground, the magnitudes of the bending moment and the shear force acting on the PHC pile 1 vary according to the depth from the ground. In reinforcing the PHC pile 1 by installing the reinforcing steel pipe 2, when the reinforcing steel pipe 2 having the same diameter is disposed irrespective of the bending moment and the shearing force that vary depending on the depth from the ground, the bending moment In the section with a small shear force and high reinforcement steel pipe (2) will result in excessive use, the problem that the economic efficiency is reduced.

In contrast, in the present invention, by placing the reinforcing steel pipe 2 having a relatively small diameter in the PHC pile 1, the primary reinforcement for the bending strength and shear strength of the PHC pile 1 by the reinforcing steel pipe 2 is achieved. The lack of bending strength and shear strength reinforcement, which is not enough to install the reinforcing steel pipe 2, is supplemented through the reinforcing steel mesh 3. Therefore, according to the present invention it is possible to prevent excessive reinforcement by using a reinforcing steel pipe (2) of diameter larger than the magnitude of the bending moment and shear force acting on the actual PHC pile (1) to reduce the material cost to improve the economics The effect that becomes possible is exhibited. In particular, the reinforcing reinforcing bar 3 can be easily selected and manufactured as needed, the number and type of vertical reinforcing bars 301, and the reinforcement spacing and type of the band reinforcing bars 302, each PHC pile (1) In addition to the reinforcement by the reinforcing steel pipe (2) in addition to the reinforcement degree necessary to adjust the installation form of the vertical reinforcing bar 301 and the band reinforcing bar (302) can be built and installed reinforcing reinforcing steel net (3). Therefore, the flexural strength and shear strength to be exerted by the reinforcing steel mesh 3 can be tailored to the needs, and the advantage that such work can be made very easily is also exerted.

Furthermore, in the present invention, an additional effect of increasing compressive strength is also exerted by the cross-sectional area of the reinforcing steel pipe (2), the reinforcing steel mesh (3), and the coupling filler (5), which produces the standardized PHC pile (1). Even if it is used, it is possible to easily construct the PHC pile 1 in the field to have the required flexural and shear strengths and to have a better compressive strength without increasing the diameter of the PHC pile 1 itself.

In filling and filling the coupling filler 5 between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1, the coupling filler 5 may be poured and filled in the reinforcing steel pipe 2 as necessary. . FIG. 10 is a schematic cross-sectional view corresponding to FIG. 4 showing a state in which the coupling filler 5 is filled in the reinforcing steel pipe 2 according to the second embodiment of the present invention. After installing the PHC pile 1 in the ground and arranging the reinforcing assembly in the hollow interior of the PHC pile 1, the filler filler 5 is to be filled between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1. At this time, as shown in FIG. 10, the filling filler 5 can also be filled by filling the inside of the reinforcing steel pipe (2). At this time, the lower end of the reinforcing steel pipe (2) is blocked by the bottom plate (4) is in a blocked state. When the filling filler 5 is also filled and hardened inside the reinforcing steel pipe 2, the flexural strength and shear strength of the PHC pile 1 are further improved, and the effect of having a greater compressive force with respect to the axial force is exerted. However, the interior of the reinforcing steel pipe (2) is not necessarily filled with the coupling filler (5) as shown in FIG.

11 is a schematic enlarged cross-sectional view showing a state in which the enlarged foundation 6 is constructed on top of the PHC pile 1 installed according to the present invention. After the PHC pile 1 is installed on the ground according to the present invention as shown in FIG. 4, it is possible to build an expanded foundation 6 by pouring concrete on top of the PHC pile 1 as shown in FIG. 11. . When the concrete is poured and the enlarged foundation 6 is built, not only the head of the PHC pile 1 but also the head reinforcement portion 31 of the reinforcing steel mesh 3 protruding above the head of the PHC pile 1 are enlarged. It is embedded in the foundation 6, whereby the head of the enlarged foundation 6 and the PHC pile 1 are more firmly integrated.

In the present invention, since the reinforcing steel pipe (2) having a relatively small diameter is used, there is a considerable gap between the reinforcing steel pipe (2) and the hollow inner surface of the PHC pile (1), and concrete using coarse aggregate can be easily filled. have. Therefore, if necessary, the reinforcing assembly is disposed in the hollow of the PHC pile 1, but the filler filler 5 is not yet filled between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1, as shown in FIG. It is also preferable to cast concrete on top of the PHC pile 1 in the state so that the concrete is filled between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1. That is, the filling operation of the combined filler (5) and the construction of the expansion base (6) may be performed at the same time. This further improves the efficiency of the work.

In particular, when the interior of the reinforcing steel pipe (2) is empty as shown in Figure 4, when pouring concrete for the construction of the expansion base (6), as shown in Figure 11 also in the interior of the reinforcing steel pipe (2) It can also cause concrete to be filled. In this case, the flexural strength and shear strength of the PHC pile 1 are further improved, and the effect of having a greater compressive force with respect to the axial force is exerted. However, as shown in FIG. 11, the concrete for the construction of the expansion foundation 6 does not necessarily have to be filled in the reinforcing steel pipe 2. If necessary, the expansion foundation 6 is constructed by installing a cover on the upper end of the reinforcing steel pipe 2 so that concrete does not flow into the reinforcing steel pipe 2 before placing concrete for the expansion foundation 6. Even if the inside of the reinforcing steel pipe (2) may be made to maintain the empty state.

In the above, the bottom plate 4, the reinforcing steel pipe 2, and the reinforcing steel mesh 3 are assembled in advance to produce a reinforcing assembly, and then the reinforcing assembly is installed in the hollow interior of the PHC pile 1. . However, the present invention is not limited thereto, and the bottom plate 4, the reinforcing steel pipe 2, and the reinforcing steel mesh 3 are respectively inserted into the hollow of the PHC pile 1 to form a reinforcing assembly, thereby forming the PHC pile 1 It can be installed in the hollow inside of). 12 (a) to (d) the process of constructing the PHC pile 1 of the present invention by installing the bottom plate 4, the reinforcing steel pipe (2) and the reinforcing steel mesh (3), respectively, individually A schematic cross-sectional view is shown showing sequentially. 13 and 14 show schematic perspective views showing an example of a configuration for inserting the bottom plate 4 into the hollow of the PHC pile 1, respectively.

After installing the PHC pile 1 in the ground as shown in FIG. 12A and placing the bottom plate 4 in the hollow of the PHC pile 1 as shown in FIG. 12B, the FIG. As shown in (c) and (d) of 12, the reinforcing steel pipes 2 and the reinforcing steel bars 3 are sequentially installed so that the reinforcing assembly is provided in the hollow of the PHC pile 1. Since the process of placing the coupling filler 5 in the space between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1 and constructing the expansion base 6 is the same as described above, it is not shown in the drawings. In installing the bottom plate 4 in the hollow of the PHC pile 1 preferentially, as illustrated in FIG. 13, the bottom plate 4 is provided with a plurality of vertical steel bars 41, but the lower end of the vertical steel bar 41. Is coupled to the bottom plate 4 and forms a locking portion at the top thereof, and then inserts the bottom plate 4 into the hollow of the PHC pile 1, and then catches the locking portion of the vertical steel bar 41 over the top of the PHC pile 1. The bottom plate 4 can also be positioned at a desired depth in the hollow of the PHC pile 1.

If necessary, in installing the reinforcing assembly in the hollow of the PHC pile 1, the hollow steel of the PHC pile 1 is preferentially manufactured by first manufacturing the reinforcing steel pipe 2 vertically and vertically coupled to the upper surface of the bottom plate 4. After insertion and placement, the reinforcing bar network 3 may be separately inserted into the hollow of the PHC pile 1 to form a reinforcing assembly. FIG. 14 is a schematic perspective view showing the reinforcement of the reinforcing steel pipe 2 to the bottom plate 4 shown in FIG. 13 in advance. An assembly of the bottom plate 4 and the reinforcing steel pipe 2 as shown in FIG. 14 is prepared in advance, and placed in the hollow of the PHC pile 1 installed in the ground to create a state as shown in FIG. After that, by installing the reinforcing reinforcing bar (3) is to be provided with a reinforcing assembly in the hollow of the PHC pile (1).

In the present invention described above, after installing the ready-made PHC pile (1) in the ground at the construction site, the reinforcing assembly consisting of the bottom plate (4), reinforcing steel pipe (2) and reinforcing steel mesh (3) in the hollow and the filling filler ( 5) By the simple construction to integrate into, the bending strength and shear strength reinforcement work of the PHC pile (1) can be easily made, and the existing PHC pile (1) can be utilized as it is, the construction cost is reduced. Particularly, in the present invention, two members of the reinforcing steel pipe 2 and the reinforcing steel mesh 3 share the bending strength and shear strength reinforcement of the PHC pile 1, and the reinforcing steel mesh 3 is a vertical reinforcing bar 301. It is very easy to fabricate to have the desired degree of reinforcement through the appropriate selection and combination of the band reinforcing bar 302. Therefore, in the present invention, a certain degree of reinforcement is made through the reinforcing steel pipe (2), and for the reinforcing demand that is insufficient only in the reinforcing steel pipe (2), to meet the reinforcement by the reinforcing steel mesh (3) made accordingly Through the reinforcing steel pipe (2) and the reinforcing steel bar (3) it is possible to meet the reinforcement requirements of the bending strength and shear strength of the PHC pile (1) required according to the ground depth in an optimal state.

Therefore, it is possible to eliminate unnecessary excessive reinforcement and consequent waste of materials caused by the use of uniformly large diameter reinforcing steel pipes, and the advantages of constructing the PHC pile 1 can be economically achieved.

1: PHC stake
11: tension material
2: reinforcing steel pipe
3: rebar network
31: Tofu reinforcement
32: main body
301 vertical rebar
302: Reinforcing Bar
4: bottom plate
41: vertical steel bar
5: bonding filler
6: enlargement

Claims (7)

Install PHC pile 1 underground;
In the hollow of the PHC pile 1, the bottom plate 4 which blocks all or part of the hollow end surface of the PHC pile 1, the reinforcing steel pipe 2 which is erected perpendicularly to the bottom plate 4, and a plurality of Positioning the reinforcing assembly including a reinforcing steel bar 3 formed in a tubular shape including a vertical reinforcing bar 301 and a band reinforcing bar 302 connecting the reinforcing steel pipe 2;
In order to embed the reinforcing assembly, the filler filler 5 is poured into the gap between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1 so that the reinforcing assembly is embedded, and then hardened to form the PHC pile 1 and the reinforcing assembly. By integrally combining;
Construction method of PHC piles, characterized in that the construction of the PHC pile (1) in the state of bending strength and shear strength is reinforced by the reinforcing assembly and the coupling filler (5).
The method of claim 1,
The reinforcing steel net 3 has a main body portion 32 that surrounds the outer side of the reinforcing steel pipe 2, and has an extended cross section larger than the cross section of the main body portion 32 and extends over the main body portion 32 to form a PHC. Method for constructing a PHC pile, characterized in that it comprises a head reinforcing portion 31 protruding above the head of the pile (1) embedded in the enlarged base (6).
The method of claim 2,
The vertical reinforcing bar 301 of the reinforcing bar 3 is bent outwardly at the first bent part D1 and then inclined again, and is then bent again at the second bent part D2 and vertically extended upward. Head reinforcement portion 31 of the) is composed of a tapered form of the bottom of the tubular cross-sectional size increases toward the top, and the vertical reinforcing bar 301 is bent again to extend vertically upward;
When the rebar network 3 is inserted into the hollow of the PHC pile 1, the portion existing between the first bent portion D1 and the second bent portion D2 of the rebar network 3 is PHC pile. Construction method of the PHC pile, characterized in that the (1) over the top hollow inlet.
As the reinforcement structure of PHC pile 1 installed in the ground,
In the hollow of the PHC pile 1, the bottom plate 4 which blocks all or part of the hollow end surface of the PHC pile 1, the reinforcing steel pipe 2 which is erected perpendicularly to the bottom plate 4, and a plurality of A reinforcing assembly including a vertical reinforcing bar 301 and a band reinforcing bar 302 connecting thereto and including a reinforcing bar net 3 installed in a tubular shape to surround the reinforcing steel pipe 2;
As the filler filler 5 is poured into the gap between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1 so that the reinforcing assembly is embedded, the PHC pile 1 and the reinforcing assembly are cured. Is integrally combined,
Reinforcement structure of PHC pile, characterized in that the bending strength and shear strength is reinforced by the reinforcing assembly and the filler filler (5).
The method of claim 4, wherein
The reinforcing steel net 3 has a main body portion 32 which surrounds the outside of the reinforcing steel pipe 2, and has an extended cross section larger than that of the main body portion and extends over the main body portion 32 to extend the PHC pile 1. Reinforcement structure of the PHC pile, characterized in that it is configured to include a head reinforcement portion 31 protruding above the head of the buried in the enlarged base (6).
As PHC pile 1 installed underground,
In the hollow of the PHC pile 1, the bottom plate 4 which blocks all or part of the hollow end surface of the PHC pile 1, the reinforcing steel pipe 2 which is erected perpendicularly to the bottom plate 4, and a plurality of A reinforcing assembly including a vertical reinforcing bar 301 and a band reinforcing bar 302 connecting thereto and including a reinforcing bar net 3 installed in a tubular shape to surround the reinforcing steel pipe 2;
As the filler filler 5 is poured into the gap between the reinforcing steel pipe 2 and the hollow inner surface of the PHC pile 1 so that the reinforcing assembly is embedded, the PHC pile 1 and the reinforcing assembly are cured. Is integrally combined,
PHC pile, characterized in that the flexural strength and shear strength is reinforced by the reinforcement assembly and the coupling filler (5).
The method of claim 6,
The reinforcing steel net 3 has a main body portion 32 that surrounds the outer side of the reinforcing steel pipe 2, and has an extended cross section larger than the cross section of the main body portion 32 and extends over the main body portion 32 to form a PHC. PHC pile, characterized in that it comprises a head reinforcement portion 31 protruding above the head of the pile (1) embedded in the enlarged base (6).

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