KR20180044223A - Pipe structure with reinforcing bar and construction method of concrete file using the same - Google Patents

Abstract

Disclosed is a method for constructing a cast-in-place concrete pile, and the method for constructing a cast-in-place concrete pile comprises: a step of preparing a steel pipe structure with a reinforced bar; a step of disposing the steel pipe structure with a reinforced bar on an excavation hole formed by excavating the ground; and a step of placing concrete inside the disposed steel pipe structure with a reinforced bar to form a concrete unit. The steel pipe structure with a reinforced bar includes a steel pipe and a plurality of cast iron rods extending in the vertical direction and arranged on the inner circumferential surface of the steel pipe at intervals along the circumferential direction and integrally coupled to the steel pipe.

Description

Technical Field [0001] The present invention relates to a steel pipe structure with reinforcing steel and a method of constructing a concrete piling structure using the steel pipe structure.

The present invention relates to a steel pipe structure with reinforcing bars and a method of constructing a pile of concrete piles using the same.

In construction sites such as civil engineering, construction, and plant construction, file construction is indispensable to stably support the load of the superstructure. Conventional installation of concrete piling concrete file was done by using sacrificial steel pipe or using double composite steel pipe to excavate the inside of steel pipe and then inserting reinforcing net into concrete.

Specifically, the pile construction method using a general sacrificial steel pipe includes a step of inserting a thick sacrificial steel pipe to support earth pressure and water pressure in the ground, a step of excavating and removing internal soil in the sacrificial steel pipe, Inserting the reinforcing net, and placing the concrete and completing the construction.

In addition, a pile construction method using a double composite steel pipe includes a step of inserting a thick steel pipe for supporting the earth pressure and water pressure in the ground, a step of excavating and removing internal gravel in the steel pipe for excavation, A step of inserting a reinforcing net after inserting a thin sacrificial steel pipe therein, and a step of pouring a steel pipe for excavation after completing the pouring of the concrete and completing the construction. For reference, a pile construction method using such a double composite steel pipe is a technique for reducing the amount of steel material required for pile construction by simply reducing the thickness of the sacrificial steel pipe.

Since the steel pipe and the concrete placed therein do not behave integrally and are separated from each other after the completion of the file construction, the conventional techniques as described above cause the reinforced concrete portion to resist 100% of the load from the upper portion and the in- Design is performed.

In other words, the conventional techniques described above are non-composite structures in which the steel pipe and the reinforced concrete portion are separated after the completion of the pile construction, and the reinforced concrete structure excluding the steel pipe is designed to withstand external loads.

Since the steel pipe and the reinforced concrete structure are not a composite structure but a separate structure at the time of completion, there is a waste factor that high rigidity of the steel pipe can not be used at all as a structural member. In addition, the reinforced concrete structure that resists external loads requires reinforcing bars with a diameter of 32 mm or more. Therefore, it is necessary to introduce the equipment for making the reinforcing net in the field. Also, when the reinforcing net is manufactured and transported, Which makes it difficult to construct and the precision is also reduced.

The background of the present invention is disclosed in Korean Utility Model Publication No. 20-0416146.

The present invention has been made to solve the problems of the prior art described above, and provides a steel pipe structure having a reinforcing steel bar which can be used as a structural member that resists a working load and can eliminate a separate reinforcing net, .

It is to be understood, however, that the technical scope of the embodiments of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to a first aspect of the present invention, there is provided a method of constructing a pile of concrete piles according to the first aspect of the present invention, comprising the steps of: preparing a reinforcing steel pipe structure; Disposing the reinforcing steel pipe structure on the excavation hole formed by excavating the ground; And forming a concrete portion by placing concrete in the disposed steel pipe structure with the reinforcing steel attached thereto, wherein the steel pipe structure having the steel pipe comprises a steel pipe and a plurality of steel pipes, each extending in the vertical direction and spaced apart in the circumferential direction And may include a plurality of cast iron rods disposed integrally with the steel pipe.

Further, the reinforcing steel pipe structure according to the second aspect of the present invention includes: a steel pipe; And a plurality of cast iron rods extending in the vertical direction and spaced along the circumferential direction on the inner circumferential surface of the steel pipe and integrally coupled to the steel pipe.

The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments in the drawings and the detailed description of the invention.

According to the above-mentioned problem solving means of the present invention, after the reinforcing steel pipe structure having a plurality of cast iron rods integrally coupled to the steel pipe and the steel pipe is disposed in the excavation hole, concrete is inserted into the steel pipe structure with the reinforcing steel to form a concrete portion A steel composite structure in which the steel pipe and the reinforcing concrete are integrally combined with each other through the cast steel rope attached to the steel pipe can be formed. As a result, the steel pipe can be used as a structural member which resists the working load unlike the conventional steel pipe. Concrete piles can be constructed without need for rebar netting, transportation and construction. Accordingly, the construction can be easily performed, the construction cost can be drastically reduced, and the construction period can be shortened.

1 is a schematic flowchart for explaining a method of constructing a pile of concrete piles according to an embodiment of the present invention.
FIG. 2A is a schematic conceptual perspective view of a steel pipe structure having a reinforcing steel of a method of constructing a pile of concrete piles according to an embodiment of the present invention; FIG.
FIG. 2B is a schematic view of a steel pipe structure having a steel reinforcing structure according to an embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view taken along BB of FIG.
FIG. 4 is a schematic conceptual view for explaining that at least one end (at least one) of a plurality of cast iron rods of a steel pipe structure having a reinforcing steel pipe structure according to an embodiment of the present invention is provided so as to protrude from an end of a steel pipe; to be.
FIG. 5A is a schematic cross-sectional view cut along CC of FIG. 2A.
FIG. 5B is a schematic plan view of a cross-section reinforcing member of a steel pipe structure having a reinforcing steel of a method of constructing a pile of concrete piles according to an embodiment of the present invention.
FIG. 6A is a schematic cross-sectional view taken along AA of FIG. 2A.
FIG. 6B is a schematic plan view of a guide member of a steel pipe structure with a reinforcing bar in a method of constructing a pile of concrete piles according to an embodiment of the present invention; FIG.
FIG. 7A is a schematic view for explaining a method of connecting a reinforcing steel pipe structure with a reinforcing steel pipe structure in a step of disposing a reinforcing steel pipe structure on a drilling hole in a method of constructing a concrete pile according to an embodiment of the present invention .
7B is a schematic cross-sectional view cut along DD of FIG. 7A.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

It will be appreciated that throughout the specification it will be understood that when a member is located on another member "top", "top", "under", "bottom" But also the case where there is another member between the two members as well as the case where they are in contact with each other.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

In the description of the embodiments of the present invention, the terms (upper, lower, etc.) related to directions and positions are set based on the arrangement state of each structure shown in the drawings. For example, when viewed in FIG. 2A, the 12 o'clock direction may be the upper side, and the 6 o'clock direction generally may be the lower side.

The present invention relates to a steel pipe structure with reinforcing bars and a method of constructing a pile of concrete piles using the same. For reference, the reinforcing steel pipe structure described herein may be applied to, but not limited to, a general pile foundation (e.g., a pile portion when the substructure is constructed in the order of pile-footing-pier).

For example, the reinforced steel tube structure of the present application can be applied to a single field drilled pile. Here, a single field drilled pile to which the reinforcing steel pipe structure of the present application is applied is applied to a footing-free foundation, and a single drilled pile is continuously extended upward without footing to refer to a pile directly connected to the pillar column Can be understood. As another example, the reinforced steel tube structure of the present application can be applied to a bridge pier. Specifically, the steel-reinforced steel pipe structure can be applied to a pier portion, not a pile portion, in the construction of a pile-pudding-pier bridge structure in that order.

As such, the reinforcing steel pipe structure of the present invention can be applied to various fields or various structural parts in which a steel composite file structure can be used.

First, a description will be made of a method of constructing a pile of concrete piles according to an embodiment of the present invention (hereinafter referred to as 'the present construction method'), and a reinforced steel pipe structure according to an embodiment of the present invention do.

1 is a schematic flow chart for explaining the present construction method.

Referring to FIG. 1, the present method includes a step (S100) of preparing a steel pipe structure 1 with a steel bar.

First, the reinforcing steel pipe structure 1 will be described.

FIG. 2A is a schematic conceptual perspective view of a steel pipe structure with a reinforcing steel of the present construction method, FIG. 2B is a schematic view of the steel pipe structure with a steel pipe of the present construction method, and FIG. 3 is a schematic cross- And Fig. 4 is a schematic conceptual view for explaining that at least one end portion of a plurality of cast iron rods of a steel pipe-reinforced steel pipe structure of the present method is provided so as to protrude from the end of a steel pipe. Fig. 5A is a schematic view FIG. 6B is a schematic cross-sectional view cut along AA of FIG. 2A, and FIG. 6B is a cross-sectional view of the reinforcing steel member of the present embodiment Fig. 3 is a schematic plan view of a guide member of a steel pipe structure. Fig.

2A is a schematic conceptual perspective view, only a part of the cast iron rope 13 inside the steel pipe 11 is schematically shown in FIG. 2A and the end of the cast iron rope 13 is connected to the steel pipe 11 And the like are not shown in the drawings. In addition, FIG. 2A also omits an illustration of an embodiment in which the end portion of the steel pipe 13 is protruded.

Referring to Figs. 2A and 2B, a steel pipe structure 1 with a steel bar includes a steel pipe 11. Illustratively, the steel pipe 11 may be a steel pipe applied to a construction pile. For example, the steel pipe 11 may be a large diameter steel pipe having a diameter of 1.0 m to 3.0 m, but is not limited thereto. A steel pipe 11 for performing an integral attachment step (for example, a welding step) of the steel main body 13 to the steel pipe 11 at a factory, a field production site, or the like, when the steel pipe 11 is a large- 11) inner space can be sufficiently secured, so that it becomes easier to manufacture the steel pipe structure 1 with reinforcing bars. The steel pipe 11 may have a length of 15 m or less due to the regulations applicable to road transport of the steel-reinforced steel pipe structure 1. Accordingly, when the excavation depth for the file arrangement exceeds the length of the steel pipe 11, a connection between two or more steel pipes 11 may be required, which will be described later.

2A and 2B, the steel pipe structure 1 with reinforcing bars includes a plurality of cast iron rods 13. A deformed reinforcing bar may be applied to the cast iron 13 to serve as a shear connection member. This will be described in detail later. In addition, the diameter of the cast iron rods 13 may be 32 mm or more.

As shown in Figs. 2A and 2B, the plurality of cast iron rods 13 extend vertically. 3, the plurality of cast iron rods 13 are arranged on the inner circumferential surface of the steel pipe 11 at intervals along the circumferential direction. In addition, a plurality of cast iron rods 13 are integrally coupled to the steel pipe 11. Illustratively, a plurality of cast iron rods 13 may be welded to the inner circumferential surface of the steel pipe 11. [

2B and 4, at least one (or at least one) of the plurality of cast iron rods 13 of the reinforcing steel pipe structure 1 may be joined to the other reinforcing steel pipe structure 1 ' An end portion thereof may protrude from the end of the steel pipe 11 so that a length of a lap joint with the plurality of cast iron rods 13 'is secured.

Illustratively, referring to FIGS. 2B and 4, a plurality of cast iron rods 13 of reinforcing steel pipe structure 1 may alternately protrude from the end of the steel pipe 11 (one by one) along the circumferential direction. Further, a plurality of cast iron rods 13 'of the other steel reinforcing steel pipe structure 1' may alternately protrude from the end of the steel pipe 11 '(one by one) along the circumferential direction. 7A, the protruded cast iron rope 13 of the reinforcing steel pipe structure 1 can be overlapped with the non-protruded cast steel rope 13 'of another reinforced steel pipe structure 1', and on the contrary, The unprojected cast iron rope 13 of the structure 1 may be overlapped with the projected cast iron rope 13 'of another steel pipe-coated steel pipe structure 1'. At this time, it is preferable to set the projecting amount of the cast iron rope 13 such that a sufficient lap joint length can be ensured in consideration of the diameter of the cast iron root and the like. Referring to FIG. 7A, since the folded joints are alternately formed in the zigzag shape, it is possible to prevent the folded joints from being continuously formed adjacent to each other at the same depth with respect to the vertical direction (depth direction) .

However, the folding method is not limited to the above-described method. For example, all of the plurality of cast iron rods 13 of the reinforcing steel pipe structure 1 are formed to protrude from the end of the steel pipe 11, and all of the plurality of cast iron rods 13 'of the other reinforcing steel pipe structure 1' May be formed to protrude from the end of the steel pipe 11 '. At this time, the lap joint length formed through the superposition of the two cast iron rods 13, 13 'can be set to be twice or more the length of the necessary lap joint length.

2A and 5A, the reinforcing steel pipe structure 1 includes a ring-shaped cross-sectional reinforcing member 16 integrally coupled to the inner circumferential surface of the steel pipe 11 so as to suppress local buckling and deformation . 5A and 5B, the cross-section reinforcing member 16 may have a plurality of through holes 161 through which a plurality of cast iron rods 13 pass. Illustratively, the material of the cross-section reinforcing member 16 may be a steel material so as to facilitate joining with the steel pipe 11. [

The reinforcing steel pipe structure 1 according to the present construction method is characterized in that the steel pipe 11 is provided with a plurality of cast iron rods 13 and a cross section reinforcement Since the member 16 is provided, the rigidity of the steel pipe 11 is reinforced, and the thickness of the steel pipe can be reduced as compared with the sacrifice steel pipe used in the related art. However, since the steel pipe is used as a structural member in reducing the thickness of the steel pipe, the pile thickness excluding the structural calculation as the structural member considering the possibility of corrosion due to the external environment (ground water, seawater, etc.) outside the steel pipe It is desirable to reduce the thickness of the steel pipe in accordance with the result of the structural calculation. For example, the thickness of the dummy considering the corrosion of the steel pipe can be set in consideration of the treatment condition of the steel pipe, the expected corrosion rate of the steel pipe considering the influence of the external environment, and the design life of the pile.

Further, if the thickness of the steel pipe 11 is simply reduced without the provision of the main reinforcement 13 and the cross-section reinforcing member 16, damage such as bending to the steel pipe 11 may occur during transportation of the steel pipe 11 or during construction However, according to the present construction method, the axial rigidity of the steel pipe structure 1 with reinforcing steel is sufficiently secured by the integral coupling of the steel pipe 11 and the steel main pole 13, and the local buckling and deformation of the cross section is prevented by the cross- 16). ≪ / RTI > For reference, in order to ensure sufficient axial rigidity of the steel pipe structure 1 with reinforcing bars, it is preferable that the diameter of the steel main bar is 32 mm or more as described above.

2A, a plurality of cross-section reinforcing members 16 may be provided and spaced apart from each other along the vertical direction with respect to the steel pipe 11. As shown in Fig.

2A and 6A, the reinforcing steel pipe structure 1 may include a guide member 15. The guide member 15 is formed so that the thermal deformation of the plurality of cast iron rods 13 is reduced or prevented when the ends of the steel pipe 11 are welded to each other by welding of the end portions of the steel pipe 11 of the other steel pipe- , It is possible to separate the end portions of the steel pipe (11) from the plurality of cast iron rods (13). The effect of the guide member 15 will be described later in detail.

6A and 6B, the guide member 15 may be in the shape of a ring integrally coupled to the inner peripheral surface of the end portion of the steel pipe 11. [ Referring to FIG. 6A, the cast iron 13 can be engaged with the inner circumferential surface of the guide member 15. Illustratively, the cast iron rope 13 may be formed to extend in the end direction of the steel pipe 11 in a bent state so as to be coupled to the inner circumferential surface of the guide member 15. [ Illustratively, the material of the guide member 15 may be a steel material so as to facilitate joining with the steel pipe 11. [

3, the cast iron 13 is attached to the inner circumferential surface of the steel pipe 11. At the end of the steel pipe 11 to which the guide member 15 is coupled, And can be spaced inwardly from the steel pipe 11. The cast iron rope 13 attached to the inner peripheral surface of the steel pipe 11 can be bent to be spaced inward from the steel pipe 11. [ As a concrete example, the cast iron rope 13 may be attached to the inner circumferential surface of the steel pipe 11 and may be gradually spaced inwardly from the steel pipe 11 by being bent obliquely to the inside of the steel pipe 11 at a predetermined angle . In addition, the cast iron rope 13 can be bent and extended by a predetermined angle in the direction opposite to the bending direction (outward direction), thereby extending parallel to the vertical direction of the steel pipe 11. [ That is, the cast iron rods 13 can be bent obliquely with respect to the up and down direction to separate from the steel pipe 11, and bent again to be parallel to the up and down direction for easy joining to the inner circumferential surface of the guide member 15 .

  In addition, the inner peripheral surface of the cast iron 13 and the guide member 15 can be joined by welding.

Step S100 may include the step of preparing the steel pipe 11 in order to prepare such a steel pipe structure 1 with reinforcing bars. The steel pipe 11 can be manufactured in the factory. Also, the step S100 may include a step of coupling the plurality of cast iron rods 13 to the steel pipe 11. As described above, the plurality of cast iron rods 13 can be integrally joined to the steel pipe 11 by welding. When the steel pipe 11 is a large diameter steel pipe having a diameter of 1.0 m to 3.0 m, And the welding of the cast steel 13 to the steel pipe 11 can be facilitated.

In addition, step S100 may include the step of providing the steel pipe 11 with the cross-section reinforcing member 16. The cross-section reinforcing member 16 can be joined to the steel pipe 11 by welding.

In addition, the step S100 may include the step of providing the guide member 15 in the steel pipe 11. [ The guide member 15 can be joined to the steel pipe 11 by welding.

For reference, the step S100 may be performed at a manufacturing site such as a factory separate from the construction site, and the steel pipe structure 1 prepared (completed) can be transported to the construction site.

Further, in step S100, a plurality of reinforcing steel pipe structural bodies 1 may be prepared. A plurality of reinforcing steel pipe structures 1 may be required when piling is performed on a plurality of points. Or, if the excavation depth for the file arrangement exceeds the length of the steel pipe 11, a connection between two or more steel pipes 11 may be required at one point. Hereinafter, a second case (when a plurality of reinforcing steel-attached steel pipe structures 1 are connected to one point) of the two cases will be described with reference to a case where a plurality of reinforcing steel pipe structures 1 are prepared .

Referring to FIG. 1, the method includes a step S300 of placing a steel pipe structure 1 with a steel bar on a drilling hole formed by excavating a ground.

FIG. 7A is a schematic conceptual view for explaining a method of connecting a reinforcing steel pipe structure with a reinforcing steel pipe structure at step S300 of the present method, and FIG. 7B is a schematic cross-sectional view taken along line D-D of FIG.

Referring to FIGS. 7A and 7B, in step S300, a plurality of reinforcing steel pipe structures 11 may be sequentially inserted into the excavation hole, and the respective steel pipes may be interconnected. A plurality of reinforcing steel pipe structural bodies 1 with reinforcing bars may be inserted into the ground (in the excavation hole) sequentially in the construction site by a required length corresponding to the excavation depth of the excavation hole. In step S300, it is preferable that the reinforcing steel pipe structure 1 inserted into the excavation hole and the reinforcing steel pipe structure 1 'to be inserted further are connected to each other in a state of maintaining a vertical position.

As described above, each of the plurality of reinforcing steel-attached steel pipe structures 11 at the time of performing the step S300 has a plurality of reinforcing steel bars 11, so that the overlapping lengths between the respective steel bars 13 are secured to the ends of the steel pipes 11, (At least one of them) protruding from the end of the steel pipe 11 may be provided.

7A and 7B, in step S300, the cast iron core 13 of one of the plurality of reinforcing steel-attached steel pipe structures 1 (one of the reinforcing steel-attached steel pipe structures) (Adjacent to each other) in the circumferential direction so as to overlap with the cast steel rods 13 of the other (one steel reinforcing steel pipe structure opposite to the other). Referring to FIG. 7B, the steel reinforcing steel pipe structure 1 (for example, a reinforcing steel pipe structure with a reinforcing steel cord) The cast iron rods 13 'may be alternately arranged (alternately) with respect to the circumferential direction of the steel pipe 11, so that the folding positions can be dispersed, thereby achieving more stable folding. 7B, the cast iron rods 13 of the reinforcing steel pipe structure 1 are paired with any one of the two cast iron rods 13 'of the neighboring steel reinforcing steel pipe structures 1' at a ratio of 1: 1 Can be arranged to be closer to each other.

The rebar-reinforced steel pipe structure 1 applied to the projecting of the end of the cast iron root and the method of the present invention as described above is not a steel pipe inserted into the sacrificial steel pipe, 11, it is necessary to make a connection between the steel bars 13 attached to the inner surface of the steel pipe structure 1 when the steel pipe assembly 1 is connected.

On the contrary, in the present construction method, the reinforcing steel pipe structure 1 is provided so as to protrude from the end of a steel pipe 11 to which a plurality of cast iron rods 13 are interconnected. In step S300 of the present construction method, Each of the plurality of cast iron rods 13 'of the steel pipe structure 1' is arranged alternately adjacent to each of the plurality of cast iron rods 13 of the reinforcing steel pipe structure 1 disposed in the excavation hole in the circumferential direction, Adjacent reinforcing steel rods 13 and 13 'can be connected to each other with sufficient lap joint length by concrete (step S500 described later) placed in the interior of the attached steel pipe structure 1. [ According to this, even if the main steel rods 13 of the steel reinforced concrete pipe structure 1 and the other main steel rods 13 'of the steel reinforcing steel pipe structure 1' are not directly connected to each other by welding or coupling, The interconnections can be made stable through securing the joint length and steel composite with concrete.

Further, in step S300, the steel tubes 11 of each of the plurality of reinforcing steel-attached steel pipe structures 1 may be interconnected by welding.

At this time, as described above, each of the plurality of steel-reinforced steel pipe structure bodies 15 may include the guide member 15. According to this guide member 15, the cast iron rope 13 can be spaced inwardly from the end of the steel pipe 11 and welded by the welding heat near the end of the steel pipe 11 generated by the welding between the steel pipes 11 Can be thermally deformed and stiffness loss can be reduced or prevented. In addition, since the concern about the thermal deformation of the cast steel rope 13 is solved, the steel pipe joining accuracy between the steel pipes 11 through welding can be improved. That is, the width (ring width) of the guide member 15 in the radial direction of the steel pipe 11 is set to be the same as that of the steel pipe 11 in order to prevent the structural rigidity of the steel pipe 13 from being damaged by welding heat at the time of welding 13 in the direction of the arrow.

Referring to FIG. 1, the method of the present invention includes a step S500 of forming a concrete portion by placing concrete in a steel pipe structure 1 having a steel pipe disposed therein.

The cast iron rope 13 attached to the steel pipe 11 by welding can serve as a tensile member integrally with the steel pipe 11. [ At the same time, the cast steel rope 13 serves as a shear connector for attaching the steel pipe 11 to the concrete portion, that is, as a kind of stud, so that the steel pipe 11 and the concrete portion can be integrated with steel composite behavior.

As described above, by applying the deformed reinforcing bars to the cast steel rods 13, the role of the shear connecting member for attaching the cast iron rods 13 to the concrete portion through the irregularities (projections) of the deformed reinforcing rods surface, It is possible to more effectively perform the mediating role of the steel composition between the concrete part and the concrete part. That is, since the deformed reinforcing bars are formed with protrusions (protrusions) on the surface of the annulus, the role as the shear connecting member for attaching the cast iron rods 13 to the concrete portion can be more effectively performed.

According to the present construction method, the steel pipe 11 can be treated as a structural member by the steel composite effect, and the use amount of the cast iron muscle can be drastically reduced compared to the conventional artificial concrete pile.

In addition, since the steel pipe 11 surrounding the cast steel 13 can serve as a shear reinforcement and a deeply-restrained reinforcing bar (belt reinforcement) of a spot-inserted concrete pile formed by the present construction method, The deeply constrained reinforcing bars included in the reinforcing net can also be omitted.

More specifically, the prior art has a separate structure in which the steel pipe and the reinforcing concrete are not joined together after completion of the piling concrete pile, so that after completion, the steel pipe serves only as a simple formwork and the reinforcing concrete must resist did. This leads to an increase in the amount of necessary cast iron rods and also to the necessity of a reinforcing bar for shearing.

On the other hand, according to the present construction method, since the steel composite 11 can be integrally combined with the concrete portion by the cast iron 13 integrally attached to the inner surface of the steel pipe 11, the steel pipe 11, (13) and the concrete part can resist together. As a result, the amount of the cast iron used can be reduced, and the band bar can be omitted.

That is, in the past, the steel pipe simply functions as a form and is separated from the reinforced concrete. According to the present construction method, a steel composite structure in which both the steel pipe 11 and the reinforced concrete are combined can be provided, can do. As a result, it is possible to omit a separate reinforcing net, and the steel pipe 11 can be used as a structural member that is resistant to an external load other than a temporary member (a sacrificial steel pipe), and the cost can be drastically reduced.

Further, in the present construction method, the thickness of the steel pipe 11 can be set in consideration of a design thickness that resists against at least one load combination at the time of designing, and a corrosion thickness that is expected to decrease due to corrosion.

Here, at least one load combination may mean various load combinations that can be considered in the design (structural calculation) of the file. That is, the steel pipe 11 can be used as a structural member that is integrated with the concrete portion and resists various external loads, which is considered variously, and is designed to be safe so that the steel pipe 11 can resist such various external loads It can mean thickness.

 Further, in terms of corrosion thickness, steel pipes can be exposed to groundwater, seawater, etc., and the thickness thereof can be reduced by corrosion over time. However, since the conventional steel pipe of the on-site concrete pile can not be integrated with the concrete part and is treated as a sacrificial steel pipe instead of a structural member resistant to external load, the thickness of the conventional steel pipe is set considering the reduction in thickness due to corrosion I did. On the other hand, according to the present construction method, since the steel pipe 11 is treated as a structural member resistant to an external load by being combined with the concrete portion through the cast iron rope 13, only the designed thickness that resists the above load combination is considered There is a possibility that the thickness thereof is reduced more than the design thickness required due to corrosion over time in the future. The thickness of the steel pipe 11 can be set in consideration of the design thickness and the thickness of the corrosion-resistant steel pipe 11 which is expected to decrease due to corrosion. Illustratively, the corrosion thickness may be, but is not limited to, 2 mm. In other words, the thickness of the steel pipe 11 can be set to be equal to or greater than the sum of the required thickness required as a structural member in the structural design and the thickness to be reduced by corrosion.

Meanwhile, the method of the present invention may include a step of excavating the ground using a steel pipe (casing) for excavation before the step S300. Illustratively, the step of forming the excavation hole may form a drilling hole using a Reverse Circulation Drill (RCD) method. For reference, the step of forming the excavation hole using the steel pipe for excavation may be performed before step S100, or may be performed between steps S100 and S300, and may be performed simultaneously with step S100.

The RCD (Reverse Circulation Drill) method forms a large-diameter excavation hole for large-diameter pile construction. According to the RCD method, the inner diameter of the steel pipe- Welding work in the steel pipe 11 is facilitated, and it is easy to install the above-mentioned cast iron rope 13, the guide member 15, the cross-section reinforcing member 16, and the like.

Further, the present construction method may include a step of drawing (drawing) the steel pipe for excavation after step S500. The steps of forming the excavation hole using the steel pipe for excavation before step S300, drawing the steel pipe for excavation after step S500, and the ancillary processes (steps) associated with these steps may be performed by a person skilled in the art It will be referred to as a known technology process, and a detailed description will be omitted.

Hereinafter, a reinforcing steel pipe structure 1 according to an embodiment of the present invention will be described. However, since the present steel reinforced concrete pipe structure 1 has the structure applied to the present construction method described above, the same reference numerals are used for the same or similar components as those described in the previous construction method, It will be omitted.

The present steel-reinforced steel pipe structure 1 includes a steel pipe 11. The thickness of the steel pipe 11 can be set in consideration of a design thickness that resists against at least one load combination at the time of designing and a corrosion thickness that is expected to decrease due to corrosion.

The reinforcing steel pipe structure 1 also includes a plurality of cast iron rods 13. By way of example, a deformed reinforcing bar may be applied to the cast iron 13 to serve as a shear connector.

The plurality of cast iron rods 13 extend vertically. The plurality of cast iron rods 13 are arranged on the inner circumferential surface of the steel pipe 11 at intervals along the circumferential direction. In addition, a plurality of cast iron rods 13 are integrally coupled to the steel pipe 11. Illustratively, a plurality of cast iron rods 13 may be welded to the inner circumferential surface of the steel pipe 11. [

The reinforcing steel pipe structure 1 may include a ring-shaped cross-section reinforcing member 16 integrally joined to the inner circumferential surface of the steel pipe 11 so as to suppress deformation of local buckling and deformation. The cross-section reinforcing member 16 may have a plurality of through holes 161 through which a plurality of cast iron rods 13 pass. A plurality of the cross-section reinforcing members 16 may be provided and spaced apart from each other along the vertical direction with respect to the steel pipe 11. [

One or more (at least one) of the plurality of cast iron rods 13 of the present steel reinforcing steel pipe structure 1 may be folded with a plurality of cast iron rods 13 'of another steel reinforced steel pipe structure 1' the end of which is protruded from the end of the steel pipe 11 so that a joint length can be ensured.

The present steel-reinforced steel pipe structure 1 may include a guide member 15. The guide member 15 is formed so that the thermal deformation of the plurality of cast iron rods 13 is reduced or prevented when the ends of the steel pipe 11 are welded to each other by welding of the end portions of the steel pipe 11 of the other steel pipe- , It is possible to separate the end portions of the steel pipe (11) from the plurality of cast iron rods (13). The guide member 15 may be in the shape of a ring integrally coupled to the inner circumferential surface of the end portion of the steel pipe 11. [

At this time, a part of the cast iron 13 may be coupled to the inner circumferential surface of the guide member 15. Illustratively, the cast iron rope 13 may be formed to extend in the end direction of the steel pipe 11 in a bent state so as to be coupled to the inner circumferential surface of the guide member 15. [ In addition, the inner peripheral surface of the cast iron 13 and the guide member 15 can be joined by welding.

In addition, the present invention can provide a method for manufacturing a steel pipe-reinforced steel pipe structure (hereinafter referred to as " the present manufacturing method ") according to one embodiment of the present invention described above. However, since the present steel reinforced steel pipe structure 1 manufactured and manufactured according to the present manufacturing method is applied to the present construction method, the present steel reinforced steel pipe structure 1, The same reference numerals are used for the same or similar components as those described in Structure 1, and redundant descriptions will be simplified or omitted.

The present manufacturing method may include the step of preparing the steel pipe 11. [

In addition, the present manufacturing method may include a step of joining a plurality of cast iron rods 13 to the steel pipe 11. [ For example, a plurality of cast iron rods 13 may be welded to the inner circumferential surface of the steel pipe 11 and integrated. In addition, in the present manufacturing method, the cast iron rope 13 is formed so that a length of a lap joint between the present steel reinforced steel pipe structure and a plurality of cast iron rods 13 'of another steel pipe structure 1' And the end portion thereof can protrude from the end of the steel pipe 11. [ This has been described in detail in this construction method, so that a more detailed description will be omitted.

In addition, the present manufacturing method may include the step of attaching the cross-section reinforcing member 16 to the steel pipe 11. [ For example, the cross-section reinforcing member 16 can be welded to the inner circumferential surface of the steel pipe 11 and integrated. 2A, a plurality of cross-section reinforcing members 16 may be arranged at predetermined intervals in the vertical direction according to need for reinforcement of the cross section of the steel pipe 11. [ The cross section reinforcing member 16 is inserted into the steel pipe 11 together with a plurality of cast iron rods 13 in a state of being assembled with a plurality of cast iron rods 13 so that the cast iron rope 13 is passed through the through holes 161 And then to the steel pipe 11. Alternatively, if necessary, the cross-section reinforcing member 16 may be first attached to the inner surface of the steel pipe 11, and then each of the plurality of cast iron rods 13 may be disposed to pass through the through hole 161. Alternatively, the cast steel reinforcing member 16 may be first attached to the inner surface of the steel pipe 11 and then attached to the inner surface of the steel pipe 11 at a predetermined position.

In addition, the present manufacturing method may include the step of attaching the guide member 15 to the steel pipe 11. [ For example, the guide member 15 can be welded to the inner peripheral surface of the steel pipe 11 and integrated. At this time, the guide member 15 is not limited to being attached to the end of the steel pipe 11 at the end. That is, it is preferable that the end of the steel pipe 11 to which the guide member 15 is attached is broadly understood to include not only the end of the steel pipe 11 but also a neighboring portion adjacent thereto. In other words, the guide member 15 may be attached to the steel pipe 11 so as to separate the cast iron wire 13 from the end of the steel pipe 11 inwardly.

This manufacturing method may include the step of attaching the cast iron rope 13 to the inner circumferential surface of the guide member 15 after the guide member 15 is attached to the steel pipe 11. [ For example, the steel pipe 11 may be firstly attached with the cast iron 13, then the guide member 15 may be attached, and the cast iron 13 and the guide member 15 may be joined. However, But is not limited thereto. Illustratively, the cast iron rope 13 may be formed to extend in the direction of the end of the steel pipe 11 in a bent state at least once so as to be coupled to the inner circumferential surface of the guide member 15. This has been described in detail in this construction method, so that a more detailed description will be omitted.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. 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 should be interpreted as being included in the scope of the present invention.

1: steel pipe structure with reinforcing steel
1 ': Steel pipe structure with other reinforcing bars
11: Steel pipe
11 ': Steel pipe with other steel reinforced steel pipe structure
13: Cast iron rods
13 ': Steel rods of other steel reinforced steel pipe structures
15: Guide member
16:
161: Through hole

Claims (12)

In a method of constructing a pile of concrete piles,
Preparing a reinforcing steel pipe structure;
Disposing the reinforcing steel pipe structure on the excavation hole formed by excavating the ground; And
And placing the concrete in the disposed steel pipe structure to form a concrete part,
Wherein the reinforcing steel pipe structure includes a steel pipe and a plurality of cast iron rods extending in the vertical direction and arranged on the inner circumferential surface of the steel pipe at intervals along the circumferential direction and integrally joined with the steel pipe, Concrete file construction method. The method according to claim 1,
Wherein the deformed reinforcing bar is applied to the plurality of cast iron rods so as to serve as a shear connection member for attachment to the concrete portion. The method according to claim 1,
Wherein the plurality of cast iron rods are welded to the inner circumferential surface of the steel pipe. The method according to claim 1,
Wherein the reinforcing steel pipe structure includes a ring-shaped cross-section reinforcing member integrally coupled to an inner circumferential surface of the steel pipe so as to suppress local buckling and deformation,
Wherein the cross-section reinforcing member has a plurality of through holes through which the plurality of cast iron rods pass. 5. The method of claim 4,
Wherein a plurality of the cross-section reinforcing members are provided and are disposed at intervals along the vertical direction with respect to the steel pipe. The method according to claim 1,
In preparing the reinforcing steel pipe structure, a plurality of reinforcing steel pipe structures are provided,
Wherein the plurality of reinforcing steel pipe assemblies are sequentially inserted into the excavation hole and the steel pipes facing each other are interconnected in the step of arranging the reinforcing steel pipe structure. The method according to claim 6,
Wherein each of the plurality of steel reinforcing steel pipe structures has at least one end portion of the plurality of steel reinforcing rods protruding from the end of the steel pipe so that the overlapping length between the steel ropes for each of the steel pipes mutually connected is secured Construction method of concrete pile installation. 8. The method of claim 7,
In the step of disposing the reinforcing steel pipe structure,
Wherein one of the plurality of reinforcing steel pipe assemblies is adjacent to the other reinforcing steel pipe structure in a circumferential direction so as to be overlapped with the other of the plurality of reinforcing steel pipe structures. The method according to claim 6,
Wherein each of the plurality of reinforcing steel pipe assemblies has a guide for separating the plurality of reinforcing bars from the end of the steel pipe so that thermal deformation of each of the plurality of cast iron rods is reduced or prevented by mutual connection by welding between the steel pipes, Wherein the method further comprises the steps of: 10. The method of claim 9,
Wherein the guide member is ring-shaped integrally coupled to an inner circumferential surface of an end portion of the steel pipe,
Wherein the plurality of cast iron rods extend in the direction of the end of the steel pipe in a bent state so as to contact the inner circumferential surface of the guide member. The method according to claim 1,
Wherein the thickness of the steel tube is set considering the design thickness resisting against at least one load combination at design time and the corrosion thickness expected to decrease due to corrosion. A reinforcing steel pipe structure,
Steel pipe; And
And a plurality of cast iron rods extending in the vertical direction and arranged on the inner circumferential surface of the steel pipe at intervals along the circumferential direction and integrally coupled to the steel pipe.

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