Structure for rigid connection between hollow pile and foundation and construction method thereof

Abstract

A rigid connection structure between a hollow pile and a foundation is disclosed. The rigid connection structure between a hollow pile and a foundation according to the present invention comprises: a hollow pile having a central hollow portion and including a pile body portion formed between the outer side of the central hollow portion and the outer surface of the pile; a hollow reinforcing bar with a hollow shape provided to be pre-embedded in the pile body portion during pile manufacturing; a head reinforcing bar anchored to the foundation, wherein the upper end of the hollow reinforcing bar is cut and opened together as the upper end of the hollow pile is cut, the anchoring portion is disposed on the upper end of the hollow reinforcing bar, and the lower end includes a connecting bar inserted into the interior of the hollow reinforcing bar; and a filling material filled between the connecting bar and the hollow reinforcing bar; wherein mechanical anchoring is achieved by the head reinforcing bar and adhesion resistance is achieved by the filling material, thereby forming a rigid connection between the pile and the foundation.

Description

Technology Field

[0001] The present invention relates to a rigid connection structure between a hollow pile and a foundation and a method for constructing such a rigid connection structure. Specifically, it relates to a structure for connecting the head of a PHC pile to a foundation, and in particular, to a connection structure and a method for constructing the same that can improve constructability while ensuring a rigid connection between the pile head and the foundation. Background Technology

[0002] In general, for the foundations of bridges, building structures, and various civil engineering structures, as shown in FIG. 1b, it is required to rigidly connect the pile head to the foundation (20) so that the pile (10) and the foundation (20) at the bottom of the column (30) behave as a single unit. In particular, since domestic design standards often assume the pile head as a fixed end, it is important to secure sufficient restraint force and bending moment transmission capability between the pile and the foundation.

[0003] However, as PHC piles are prestressed concrete structures manufactured in a factory, they feature internal tensioning elements (PC steel wires or PC steel strands) and a hollow cross-section. Consequently, there are various constraints in rigidly connecting the pile heads to the foundation at the construction site. In other words, unlike cast-in-place piles, it is difficult to freely extend or rearrange internal reinforcement, and there are limitations in reinforcing the pile heads and forming anchorage structures.

[0004] In particular, during actual construction, it is frequently necessary to adjust the length of PHC piles according to design conditions or site conditions; in such cases, the pile head is cut to align the connection position with the foundation. However, in conventional technology, the pile must be connected to the foundation while leaving the internal tensioning members intact when the pile is cut, and this structure has the following problems.

[0005] First, as shown in FIG. 1a and FIG. 1c (a), the work of trimming the cut surface (13) and joining it with the foundation reinforcement must be performed under limited working conditions at the site, which significantly reduces constructability and causes the quality of the joining to depend heavily on the skill level of the worker.

[0006] Second, if the tensioning member protrudes outward from the cut pile head, the length of the tensioning member protruding from the cut surface is limited, making it difficult to secure a sufficient anchorage length within the foundation concrete and difficult to achieve a structurally stable rigid connection.

[0007] Third, even if pile head reinforcing bars are inserted into the hollow portion of a cut hollow pile as shown in (b) of Fig. 1c, there is a very high possibility that the connection between the pile and the foundation will not remain at a level of complete rigid connection, and accordingly, there is a concern that a difference may occur between the structural behavior assumed during design and the actual behavior.

[0008] Fourth, anchorage structures using steel are vulnerable to corrosion in the long term, which limits their ability to ensure durability. In particular, corrosion accelerates in underground or marine environments where groundwater is present, raising concerns about long-term structural performance degradation.

[0009] Meanwhile, some technologies proposed a method of connecting the pile to the foundation by inserting additional reinforcing steel inside the pile, but even in this case, the problem of constructability after cutting the pile was not fundamentally resolved, and the anchoring structure was also limited, so there were limitations in securing a sufficient rigid connection.

[0010] Therefore, there is a need to develop a new connection structure that can form a stable rigid connection between the pile head and the foundation while maintaining excellent constructability even when PHC piles are cut to suit site conditions, and simultaneously improve durability and structural performance. The problem to be solved

[0011] The present invention aims to solve the problems of the conventional technology described above by providing a rigid connection structure and a construction method that enables a stable connection even after the pile is cut, when rigidly connecting the head of a hollow pile, particularly a PHC pile, to a foundation.

[0012] Specifically, the present invention aims to facilitate connection with the foundation by pre-embedding a hollow reinforcing bar in the pile body during pile manufacturing, so that even if the top of the pile is cut at the site, the reinforcing bar is cut along with it and exposed in an open state, and by inserting a connecting bar of an enlarged head anchoring part into the reinforcing bar.

[0013] In addition, another objective of the present invention is to enable the formation of a secure rigid connection between a pile and a foundation by filling a filler material between a connecting bar inserted inside the reinforcing bar and the reinforcing bar, increasing adhesion by a spiral protrusion formed on the inner surface of the reinforcing bar, and simultaneously achieving mechanical anchoring by an enlarged head anchoring part.

[0014] In addition, another objective of the present invention is to improve constructability and secure structural reliability by forming the enlarged head anchoring part with fiber-reinforced composite material (GFRP), improving adhesion performance with the foundation through a twisted structure and an uneven surface and groove on the outer surface, stably controlling the insertion depth and position of the connecting bar through a stopper and a tapered structure, and maintaining center alignment through a spacer.

[0015] Ultimately, the final objective of the present invention is to provide a rigid connection structure and a construction method that can stably realize a rigid connection between a hollow pile and a foundation through a new connection structure in which mechanical anchorage and adhesive anchorage interact in combination, while simultaneously solving the problem of reduced constructability caused by pile cutting. means of solving the problem

[0016] A rigid connection structure between a hollow pile and a foundation according to the present invention for solving the aforementioned technical problem comprises: a hollow pile having a central hollow portion and a pile body portion formed between the outer side of the central hollow portion and the outer surface of the pile; a hollow reinforcing bar with a hollow shape provided to be pre-embedded in the pile body portion during pile manufacturing; a head reinforcing bar anchored to the foundation, wherein the upper end of the hollow reinforcing bar is cut and opened together as the upper end of the hollow pile is cut, the anchoring portion is disposed on the upper end of the hollow reinforcing bar, and the lower end includes a connecting bar inserted into the interior of the hollow reinforcing bar; and a filling material filled between the connecting bar and the hollow reinforcing bar; wherein mechanical anchoring is achieved by the head reinforcing bar and adhesion resistance is achieved by the filling material, thereby forming a rigid connection between the pile and the foundation.

[0017] The above hollow reinforcing bar is formed of steel, and the above head reinforcing bar is formed of fiber-reinforced composite material (GFRP).

[0018] The anchorage portion of the head reinforcing bar is provided as a stepped anchorage portion whose width increases toward the end, and is characterized by having a twisted structure in which a twist is formed along the longitudinal direction.

[0019] The inner surface of the hollow reinforcing bar is provided with a spiral protrusion along the longitudinal direction, and the outer surface of the head reinforcing bar is characterized by having a plurality of protrusions and grooves formed therein.

[0020] The connecting bar inserted into the hollow reinforcing bar has its insertion depth determined by a stopper provided at a preset position inside the hollow reinforcing bar, and the stopper is characterized by having a taper that is wider at the top and narrower at the bottom.

[0021] The above stopper is characterized by having an insertion portion provided at the top to correspond to the outer diameter of the connecting bar, and the stopper is forcibly fitted into the interior of the hollow reinforcing bar.

[0022] A spacer is provided with a size corresponding to the inner circumference of the upper portion of the hollow reinforcing bar and is provided to maintain the gap and center alignment between the connecting bar and the hollow reinforcing bar, and the spacer is characterized by being provided in a ring shape.

[0023] In addition, a construction method for rigidly connecting a hollow pile and a foundation comprises the steps of: cutting the upper portion of a hollow pile, which is formed by pre-embedding a hollow reinforcing bar in the pile body during manufacturing to expose the upper portion of the hollow reinforcing bar; inserting a connecting bar provided at the lower portion of the head reinforcing bar into the hollow reinforcing bar; filling a filler material between the connecting bar and the hollow reinforcing bar; and anchoring the head reinforcing bar to the foundation; thereby forming a rigid connection between the pile and the foundation.

[0024] The above-mentioned hollow reinforcing bar is formed of steel, and the above-mentioned head reinforcing bar is formed of fiber-reinforced composite material (GFRP). The above-mentioned head reinforcing bar is characterized by increased adhesion to the foundation through a twisted structure formed with twisting along the longitudinal direction and a plurality of protrusions and grooves formed on the outer surface.

[0025] The above-described connecting bar has its insertion depth limited by a stopper pre-installed inside the hollow reinforcing bar, and the stopper is formed to have a tapered shape that is wider at the top and narrower at the bottom to induce the insertion of the connecting bar and fix its position, and is further characterized by having a ring-shaped spacer between the connecting bar and the hollow reinforcing bar for maintaining spacing and center alignment. Effects of the invention

[0026] The rigid connection structure of a hollow pile and a foundation and the construction method thereof according to the present invention have the following effects.

[0027] First, by pre-embedding hollow reinforcing bars in the pile body during manufacturing, the reinforcing bars are cut along with the top of the pile even if it is cut on-site, automatically exposing the interior in an open state. Consequently, the connection work can be performed simply by inserting the connecting bar of the head reinforcing bar into the hollow reinforcing bars without any separate work on-site, thereby significantly improving constructability.

[0028] Second, a filler material is filled between the connecting bar of the head reinforcing bar and the hollow reinforcing bar, and the adhesion with the filler material is increased by the spiral protrusions formed on the inner surface of the hollow reinforcing bar. Since mechanical anchorage is simultaneously achieved by the stepped anchorage, a reliable and stable rigid connection can be formed between the pile and the foundation through the combined action of mechanical anchorage and bond anchorage.

[0029] Third, by forming the head reinforcing steel with fiber-reinforced composite (GFRP), the corrosion problems that occurred in conventional steel anchorage structures can be fundamentally resolved, and long-term durability can be secured even in underground or marine environments where groundwater is present.

[0030] Fourth, the bond performance with the foundation concrete is improved by the twisted structure of the head reinforcing bar and the numerous irregularities and grooves on the outer surface, and the mechanical anchorage performance is improved by the structure in which the width increases toward the end of the stepped anchorage, so the bending moment transmission and restraint force required in the design can be faithfully secured.

[0031] Fifth, the insertion depth of the connecting bar is controlled consistently by the tapered structure of the stopper, which is wider at the top and narrower at the bottom, and the gap between the connecting bar and the hollow reinforcing bar is maintained uniformly by the spacer, thereby ensuring center alignment, so that the construction quality can be maintained consistently without relying on the skill level of the worker. Brief explanation of the drawing

[0032] FIG. 1a is a conceptual diagram showing the top of a hollow pile being cut and trimmed according to the prior art. FIG. 1b is a conceptual diagram showing the combined relationship between a general pile and a foundation, FIG. 1c is a conceptual diagram showing problems associated with the treatment of the upper part of a hollow pile, FIG. 2 is a conceptual diagram of a rigid connection structure between a hollow pile and a foundation according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a rigid connection structure of a hollow pile and a foundation according to an embodiment of the present invention. FIG. 4 is a plan view of a hollow pile according to an embodiment of the present invention, FIG. 5 is an enlarged conceptual diagram of a rigid connection structure between a hollow pile and a foundation according to an embodiment of the present invention. FIG. 6 is an example of a hollow reinforcing bar according to an embodiment of the present invention. Specific details for implementing the invention

[0033] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.

[0034] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0036] The rigid connection structure of a hollow pile and a foundation and the method of constructing the rigid connection structure of a hollow pile and a foundation according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0037] Referring to FIGS. 2 to 4, a hollow pile (110) according to an embodiment of the present invention is, for example, a PHC pile and is provided to have a central hollow portion (130), and includes a pile body portion (111) formed between the inner surface of the pile body portion (111) and the outer surface of the pile body portion (111) on the outer side (113) of the central hollow portion (130).

[0038] The hollow pile (110) is a pile manufactured in advance at a factory, having a tensioning member (PC steel wire or PC steel strand) or reinforcing bar placed inside and a hollow cross-section formed by centrifugal force. A hollow reinforcing bar (120), which will be described later, is embedded in the pile body (111) of the hollow pile (110) in advance during pile manufacturing.

[0039] When the length of the hollow pile (110) needs to be adjusted according to site conditions or design conditions, the upper part of the pile is cut. At this time, the upper end of the hollow reinforcing bar (120) that is pre-embedded in the pile body (111) is also cut and exposed, so the preparation for connection with the foundation is completed simply by inserting the connecting bar (141) of the head reinforcing bar (140) into the hollow reinforcing bar (123) without any additional work.

[0040] Referring to FIGS. 5 and 6, the hollow reinforcing bar (120) is a hollow steel member comprising a hollow reinforcing bar body (121) and a hollow reinforcing bar interior (123), and is embedded in the pile body portion (111) in advance during pile manufacturing. A plurality of hollow reinforcing bars (120) may be arranged at equal intervals along the circumferential direction of the pile cross-section and are located within the pile body portion (111), which is the outer (113) area of ​​the central hollow portion (130), as shown in the plan view of FIG. 4.

[0041] A spiral uneven surface (125) is formed along the longitudinal direction on the inner surface of the hollow reinforcing bar (120). The spiral uneven surface (125) serves to significantly improve the adhesion between the filler (150) and the hollow reinforcing bar (120) by increasing the contact area with the filler (150) filled inside the hollow reinforcing bar (123) and inducing mechanical interlocking.

[0042] Additionally, an outer groove (129) is formed on the outer surface of the hollow reinforcing bar (120). The outer groove (129) improves the adhesion between the hollow reinforcing bar (120) and the surrounding pile concrete, thereby allowing the hollow reinforcing bar (120) to be firmly anchored within the pile body (111). As shown in FIG. 6, the hollow reinforcing bar (120) has a spiral groove structure on its outer surface and a hollow tubular cross-section.

[0043] Since the hollow reinforcing bar (120) is formed from steel, it is integrated with concrete during the centrifugal forming process when manufacturing the pile and is firmly embedded within the pile body (111). Because the hollow reinforcing bar (120) is embedded in advance during the pile manufacturing stage, when the pile is cut at the site, the top of the hollow reinforcing bar (120) is also cut, and the interior is automatically exposed in an open state. Therefore, the head reinforcing bar (140) can be inserted immediately without additional drilling work or complex reinforcing bar exposure work at the site, which greatly improves constructability.

[0044] Referring to FIGS. 2, 3 and 5, the head reinforcing bar (140) includes a fixing part and a connecting bar (141), and is a core member that is inserted and fixed into the interior (123) of the hollow reinforcing bar (120) with the top end of the hollow reinforcing bar (120) exposed to form a rigid connection between the pile and the foundation.

[0045] The head reinforcing bar (140) is preferably formed from a fiber-reinforced composite material (GFRP, Glass Fiber Reinforced Polymer). GFRP is a material formed by combining glass fibers with a matrix such as epoxy resin, and it has the characteristics of being lightweight compared to steel, having high tensile strength, and not corroding. Therefore, long-term durability can be secured even in groundwater or marine environments.

[0046] The anchorage portion of the head reinforcing bar (140) is provided as a stepped anchorage portion (143). The stepped anchorage portion (143) has a stepped, expanding cross-sectional structure in which its width (diameter) increases toward the end, thereby enabling mechanical anchorage within the foundation concrete. The stepwise expanding cross-section of the stepped anchorage portion (143) forms a bearing surface with the foundation concrete even with a short length, thereby improving resistance performance against pull-out force.

[0047] Additionally, the head reinforcing bar (140) has a twisted structure formed along the longitudinal direction. The twisted structure increases the contact area between the surface of the head reinforcing bar (140) and the foundation concrete and improves adhesion performance by inducing mechanical interlocking. A plurality of protrusions and grooves are formed on the outer surface of the head reinforcing bar (140) to further improve adhesion with the foundation concrete.

[0048] The connecting bar (141) is provided at the bottom of the head reinforcing bar (140) and is a part that is inserted into the interior (123) of the hollow reinforcing bar. With the connecting bar (141) inserted into the interior (123) of the hollow reinforcing bar, the space between them is filled with a filling material (150), thereby forming an attachment anchor between the connecting bar (141) and the hollow reinforcing bar (120).

[0049] The filler material (150) is a material that fills the space between the connecting bar (141) and the hollow reinforcing bar (120) to integrate the connecting bar (141) and the hollow reinforcing bar (120). Non-shrink mortar, epoxy-based materials, cement grout, etc., may be used as the filler material (150). The filler material (150) filled inside the hollow reinforcing bar (123) engages with the spiral irregularities (125) on the outer surface of the connecting bar (141) and the inner surface of the hollow reinforcing bar (120) to exhibit high adhesion.

[0050] By combining attachment anchoring by the filler material (150) and mechanical anchoring by the stepped anchoring part (143), the rigid structure of the present invention can secure sufficient bending moment transmission capability and restraint force between the pile and the foundation.

[0051] Referring to FIG. 5 (b) and (c), a stopper (147) is provided at a preset position inside the hollow reinforcing bar (123). The stopper (147) serves to control the insertion depth consistently when the connecting bar (141) is inserted into the hollow reinforcing bar (123).

[0052] The stopper (147) is formed to have a tapered shape that is wider at the top and narrower at the bottom. That is, the stopper (147) has a tapered structure in which the outer and inner diameters become wider towards the top and narrower towards the bottom, so when the connecting bar (141) is inserted, it is naturally guided along the tapered surface and settled in a designated position. Accordingly, the insertion depth of the connecting bar (141) is maintained at a constant level, thereby improving construction precision.

[0053] An insertion part (149) corresponding to the outer diameter of the connecting bar (141) is provided on the upper part of the stopper (147), and the stopper (147) is press-fitted into the hollow reinforcing bar (120). Since the stopper (147) is firmly fixed at a set position inside the hollow reinforcing bar (120) by the press-fit, the stopper (147) can function stably without detaching when the connecting bar (141) is inserted.

[0054] The spacer (145) is provided with a size corresponding to the inner surface of the upper part of the hollow reinforcing bar (120) and serves to maintain a uniform gap between the connecting bar (141) and the hollow reinforcing bar (120) and to ensure the center alignment of the connecting bar (141). The spacer (145) is provided in a ring shape and placed on the upper part of the hollow reinforcing bar (120), and guides the connecting bar (141) to be inserted in a state aligned with the central axis of the hollow reinforcing bar (120). Accordingly, the filling material (150) can be uniformly filled between the connecting bar (141) and the hollow reinforcing bar (120), thereby ensuring consistent adhesion performance.

[0056] Hereinafter, a method for constructing a rigid structure of a hollow pile and a foundation according to an embodiment of the present invention will be described step by step.

[0057] (1) Hollow pile manufacturing step: First, when manufacturing a PHC pile in a factory, a hollow reinforcing bar (120) with a hollow shape is embedded in the pile body (111) in advance. The hollow reinforcing bar (120) is integrated with concrete during the centrifugal molding process and is firmly embedded in a predetermined position within the pile body (111).

[0058] (2) Pile head cutting and hollow rebar exposure step: The top of the hollow pile (110) is cut at the site according to the design or construction conditions. As the top of the pile is cut, the top of the hollow rebar (120) embedded in the pile body (111) is also cut and exposed in an open state. During this process, the inside (123) of the hollow rebar is naturally opened, so the next step can be proceeded without any separate internal cleanup work.

[0059] (3) Insertion step of the connecting bar: A connecting bar (141) provided at the bottom of the head reinforcing bar (140) is inserted into the hollow reinforcing bar (123). The connecting bar (141) is guided by the tapered structure of the stopper (147), which is wider at the top and narrower at the bottom, and is accurately inserted to a preset insertion depth, and the insertion position is fixed by the insertion part (149) of the stopper (147). Accordingly, the insertion depth of the connecting bar (141) can be controlled consistently without separate measurement during construction. The spacer (145) is intended to maintain the center alignment of the connecting bar (141) and to ensure a uniform gap between the connecting bar (141) and the hollow reinforcing bar (120).

[0060] (4) Filling step: With the connecting bar (141) inserted into the interior (123) of the hollow reinforcing bar, a filling material (150) is filled into the space between the connecting bar (141) and the hollow reinforcing bar (120). The filling material (150) may be non-shrink mortar or an epoxy-based material, and exhibits high adhesion by interlocking with the spiral irregularities (125) formed on the inner surface of the hollow reinforcing bar (120). As the filling material (150) hardens, the connecting bar (141) and the hollow reinforcing bar (120) become integrated.

[0061] (5) Foundation anchoring stage: After the filling material (150) hardens, the foundation reinforcement bar (140) is anchored to the foundation by placing the foundation reinforcement bar and pouring concrete so that the stepped anchoring part (143) of the head reinforcement bar (140) is embedded within the foundation concrete. The stepped anchoring part (143) forms mechanical anchorage within the foundation concrete, and the attachment anchorage is achieved through the twisted structure of the connecting bar (141) and the irregularities and grooves on the outer surface, thereby forming a stable rigid connection between the pile and the foundation.

[0063] Thus, according to the construction method of the present invention, the upper part of the pile is cut at the site, and then the rigid connection can be completed in a simple sequence of inserting the connecting bar (141), filling the filling material (150), and pouring the foundation, thereby significantly improving constructability. In addition, since the insertion position and alignment of the connecting bar (141) are automatically controlled by the stopper (147) and the spacer (145), the construction quality can be maintained consistently without relying on the skill level of the worker.

[0067] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0068] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0069] 110: Hollow pile 111: Pile body 113: Outer side of the central hollow section 120: Hollow rebar 121: Hollow rebar body 123: Inside hollow rebar 125: Spiral unevenness 127: Homeboo 129: Lateral groove 130: Central Chinese Ministry 140: Head reinforcing steel 141: Connecting bar 143: Stepped anchorage 145: Spacer 147: Stopper 149: Insert 150: Filler

Claims

Claim 1 A rigid connection structure for rigidly connecting a hollow pile and a foundation comprises: a hollow pile provided to have a central hollow portion and including a pile body portion formed between the outer side of the central hollow portion and the outer surface of the pile; a hollow reinforcing bar with a hollow shape provided to be pre-embedded in the pile body portion during pile manufacturing; a head reinforcing bar anchored to the foundation, wherein the upper end of the hollow reinforcing bar is cut and opened together as the upper end of the hollow pile is cut, the anchoring portion is disposed on the upper end of the hollow reinforcing bar, and the lower end includes a connecting bar inserted into the interior of the hollow reinforcing bar; and a filling material filled between the connecting bar and the hollow reinforcing bar; wherein mechanical anchoring is achieved by the head reinforcing bar and adhesion resistance is achieved by the filling material to form a rigid connection between the pile and the foundation, and the insertion depth of the connecting bar inserted into the hollow reinforcing bar is determined by a stopper provided at a preset position inside the hollow reinforcing bar, and the stopper is wider at the top and narrower at the bottom Rigid connection structure of a hollow pile and a foundation characterized by having a tapered shape. Claim 2 A rigid connection structure of a hollow pile and a foundation according to claim 1, wherein the hollow reinforcing bar is formed of steel and the head reinforcing bar is formed of fiber-reinforced composite material (GFRP). Claim 3 A rigid connection structure for a hollow pile and a foundation according to claim 2, wherein the anchoring portion of the head reinforcing bar is provided as a stepped anchoring portion whose width increases toward the end, and has a twisted structure formed with a twist along the longitudinal direction. Claim 4 A rigid connection structure for a hollow pile and a foundation according to claim 2, characterized in that a spiral protrusion is provided along the longitudinal direction on the inner surface of the hollow reinforcing bar, and a plurality of protrusions and grooves are formed on the outer surface of the head reinforcing bar. Claim 5 delete Claim 6 A rigid connection structure of a hollow pile and a foundation according to claim 1, wherein the stopper is provided with an insertion portion at the upper end corresponding to the outer diameter of the connecting bar, and the stopper is forcibly fitted into the interior of the hollow reinforcing bar. Claim 7 A rigid connection structure for a hollow pile and a foundation according to claim 6, characterized in that a spacer is provided with a size corresponding to the inner circumference of the upper portion of the hollow reinforcing bar and maintains the gap and center alignment between the connecting bar and the hollow reinforcing bar, and the spacer is provided in a ring shape. Claim 8 A construction method for rigidly connecting a hollow pile and a foundation, comprising the steps of: cutting the upper portion of a hollow pile formed by pre-embedding a hollow reinforcing bar in the pile body portion during pile manufacturing to expose the upper portion of the hollow reinforcing bar; inserting a connecting bar provided at the lower portion of the head reinforcing bar into the hollow reinforcing bar; filling a filler material between the connecting bar and the hollow reinforcing bar; and anchoring the head reinforcing bar to the foundation; wherein the insertion depth of the connecting bar is limited by a stopper pre-installed inside the hollow reinforcing bar, and the stopper is formed to have a tapered shape that is wider at the top and narrower at the bottom to induce the insertion of the connecting bar and fix its position, and further comprising a ring-shaped spacer between the connecting bar and the hollow reinforcing bar for maintaining a gap and center alignment. Claim 9 A method for constructing a rigid connection structure between a hollow pile and a foundation according to claim 8, wherein the hollow reinforcing bar is formed of steel, the head reinforcing bar is formed of fiber-reinforced composite material (GFRP), and the head reinforcing bar has a twisted structure formed along the longitudinal direction and a plurality of irregularities and grooves formed on the outer surface, thereby increasing the adhesion force with the foundation. Claim 10 delete

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