Concrete structure drilling method for post-installed anchor construction

Abstract

Disclosed is a concrete structure drilling method for post-installed anchor construction. The concrete structure drilling method for post-installed anchor construction is for drilling an anchor hole of a post-installed anchor on a concrete structure side in a state in which the expansion of a concrete fracture failure section can be induced, the method comprising the steps of: forming an anchor hole vertically on a concrete structure side; and forming an expansion locking groove horizontally on the lower side of the anchor hole.

Description

Concrete structure drilling method for post-installation anchor construction

[0001] The present invention relates to a method for drilling a concrete structure for post-installation anchor construction.

[0002] Anchors, generally used in concrete structures, are used to secure the fixed side of various facilities or devices to the concrete surface.

[0003] There are various types of anchors used in concrete structures depending on the required conditions, and they are classified into cast-in-place anchors and post-installed anchors depending on the time of installation.

[0004] Post-installed anchors are installed (post-installed) to ensure fixed support force in a concrete structure that has been hardened. A representative post-installed anchor is the concrete expansion post-installed anchor (CEA).

[0005] Post-installation anchors are known to be used to secure various facilities and devices within nuclear power plants, which require the highest level of safety construction performance among various construction fields.

[0006] In order to further secure the fixing support capacity by these post-installation anchors, anchor holes are formed on the side of the hardened concrete structure, and in particular, a hole structure capable of inducing expansion of the concrete rupture failure cross-section at the anchor installation site is required. By implementing this, the safety and reliability of fixing construction by post-installation anchors can be further improved.

[0007] The present invention has been devised to solve the above-mentioned problems,

[0008] The purpose of the present invention is to provide a method for drilling a concrete structure for installing a post-installation anchor, which forms an anchor hole for installing a post-installation anchor on the side of a hardened concrete structure, and in particular, forms the hole in a state that conforms to the expansion induction of a concrete rupture failure cross-section.

[0009] In order to achieve the above purpose,

[0010] A method for forming an anchor hole of a post-installation anchor by perforating the concrete structure side in a state in which expansion of the concrete rupture failure section is induced,

[0011] A step of forming an anchor hole in a vertical direction on the side of a concrete structure; and

[0012] A step of forming a horizontally expanding catch groove on the lower side of the anchor hole;

[0013] Includes,

[0014] The step of forming the above expansion groove is:

[0015] A method for drilling a concrete structure for post-installation anchor construction is provided, characterized in that an expansion engaging groove is formed on the lower side of the anchor hole in a manner that induces expansion movement and rotation of the expansion drill bit while the expansion drill bit is inserted into the anchor hole side.

[0016] The present invention, by forming an anchor hole for construction of a post-installation anchor on the side of a hardened concrete structure and integrally forming an expansion catch groove on the lower side of the hole of the anchor hole, can be expected to have the effect of further increasing the anchor fixing support force by inducing expansion of the concrete rupture failure cross-section, particularly by the expansion catch groove, after construction of the post-installation anchor.

[0017] Figure 1 is a process diagram showing the entire work process of a concrete structure drilling method for post-installation anchor construction according to one embodiment of the present invention.

[0018] FIGS. 2 to 8 are drawings for explaining in detail each process of a concrete structure drilling method for post-installation anchor construction according to one embodiment of the present invention.

[0019] Hereinafter, a preferred embodiment of the present invention will be described with reference to the attached drawings.

[0020] Embodiments of the present invention are described within a range that allows those with average knowledge in the art to practice the present invention.

[0021] Accordingly, since the embodiments of the present invention can be modified into various different forms, the scope of the claims of the present invention is not limited to the embodiments described below.

[0022] FIG. 1 is a process diagram showing the entire work process of a concrete structure drilling method for post-installation anchor construction according to one embodiment of the present invention, and FIGS. 2 to 8 are drawings for explaining each process of FIG. 1 in detail.

[0023] Referring to Fig. 1, a concrete structure drilling method for post-installation anchor construction according to one embodiment includes an anchor hole forming step (S1) and an expanded engaging groove forming step (S2). Detailed operations of each process are described with reference to Figs. 2 to 8.

[0024] The anchor hole formation step (S1) is to form an anchor hole (H1) so as to have a “-” shaped hole shape extending vertically from the surface side of the concrete structure (C) as shown in Fig. 2.

[0025] In the anchor hole formation step (S1), an anchor hole (H1) can be formed by drilling a hole in a vertical direction downward from the surface side of a concrete structure (C) using a general concrete drill bit (D) in the shape of the letter “-”.

[0026] The concrete drill bit (D) can be rotated to perform drilling by receiving rotational force from an electric drill device (M, e.g., an electric wrench) as shown in Fig. 2.

[0027] The inner diameter and length (depth) of the hole of the anchor hole (H1) can be formed to have a hole size that matches the diameter and length of the post-installation anchor.

[0028] Meanwhile, the expansion catch groove formation step (S2) is formed in connection with the anchor hole (H1) side to improve the anchor fixation support capacity.

[0029] In particular, the expansion groove formation step (S2) is to form a groove on the inside of the anchor hole (H1) in a state that matches the expansion induction of the concrete rupture failure cross-section of the anchor hole (H1) formed on the concrete structure (C) side.

[0030] The expansion groove formation step (S2) is performed by forming a groove that is horizontally extended toward the outside from the lower side of the hole of the anchor hole (H1) formed vertically on the side of the concrete structure (C).

[0031] The expansion catch forming step (S2) can be performed by cutting the lower inner surface of the anchor hole (H1) using an expansion drill bit (B), as shown in Fig. 3, to secure a groove space expanded outward.

[0032] An expansion drill bit (B) may be formed by including a bit body (10) having a hollow portion (E) as shown in Fig. 3, an expansion tip (20) positioned so as to induce expansion movement from the lower inner side of the bit body (10) toward the outer side, and a connecting rod (30) detachably fitted to the bit body (10) side in a state consistent with the expansion and rotation induction of the expansion tip (20).

[0033] The bit body (10) may be formed into a cylindrical structure with a hollow portion (E) formed on the inside along the length direction.

[0034] The bit body (10) is formed to have a diameter and length that can be detachably inserted into the anchor hole (H1), and the material can be selected from among metal materials with excellent durability and wear resistance.

[0035] The extension tip (20) may be placed on one end of the length direction of the bit body (10), i.e., the lower side, as shown in FIG. 3, and may be set so that an extension movement toward the outside can be induced by being inserted into the guide groove (G) side formed in a state of being connected to the hollow part (E) side on the peripheral side of the bit body (10).

[0036] As shown in Fig. 4, the extension tip (20) can be set in a state where a plurality of extension tips can be spaced apart from each other on the lower peripheral side of the hole of the bit body (10) and an extension movement can be induced toward the outside of the peripheral side.

[0037] And, the extension tips (20) can be formed in a multi-stage arrangement on the lower side of the bit body (10) as shown in Fig. 3 depending on the required cutting work conditions.

[0038] The material of the extension tip (20) is metal, but can be selected from among metals with material properties suitable for cutting processing of concrete.

[0039] The connecting rod (30) has a rod shape that can be detachably inserted into the hollow portion (E) side of the bit body (10), and a head portion (32) for rotational operation is formed at one end (upper) of both ends of the rod, and a connecting portion (34) is formed at the other end (lower) side to enable rotational force transmission to the extension tip (20).

[0040] The head portion (32) can be formed in the shape of, for example, the head of a hexagonal bolt, and is formed so as to receive rotational force from an electric drill device (M).

[0041] The connecting portion (34) is formed in a state corresponding to each other on the sides of the connecting rod (30) and the extension tip (20) as shown in FIGS. 3 and 4, but is formed to have a structure that can be connected to each other by insertion so that the tip can be induced to expand and the rotational force can be transmitted by contact interference between the extension tip (20) and the rod (30) when the connecting rod (30) is inserted through the hollow portion (E) of the bit body (10).

[0042] The connecting portion (34) may be formed by having a connecting projection (34a) and a connecting groove (34b) formed in a state corresponding to each other on the insertion end (peripheral portion) of the connecting rod (30) and the side of the extension tip (20) so that the connecting portion (34) can be detachably fitted in a spline shape, for example, as shown in FIG. 4.

[0043] And, the connecting portion (34) has a guide surface (34c) as shown in Fig. 3, and this guide surface (34c) is formed to be inclined at the contact interference point between the connecting rod (30) and the extension tip (20).

[0044] That is, the guide surface (34c) is formed in an inclined shape on the upper side of the extension tip (20) as in Fig. 3, but is formed inclined in a state in which the extension movement of the extension tip (20) can be smoothly induced as in Fig. 4 by contact interference (pressure) with the insertion end side of the rod when the connecting rod (30) is inserted.

[0045] This connecting part (34) can be connected or disconnected from the extension tip (20) side by the connecting projection (34a) and the connecting groove (34b) being separable from each other when the connecting rod (30) side is operated axially, and when the rotation is operated around the axis of the rod (30), a connecting structure can be formed that can transmit rotational force for cutting processing to the extension tip (20) side by the engaging contact between the connecting projection (34a) and the connecting groove (34b).

[0046] In addition, the connecting portion (34) can provide a connecting structure in which sequential expansion movement of the multi-stage arranged expansion tips (20) can be achieved by the guide surface (34c) when the connecting rod (30) side is pressed downward while being fitted into the hollow portion (E) side of the bit body (10).

[0047] The detailed operation of the expansion catch groove formation step (S2) using the expansion drill bit (B) is as follows.

[0048] First, as shown in Fig. 5, the bit body (10) of the expansion drill bit (B) is fitted into the anchor hole (H1) side of the concrete structure (C) and set so that the bit body (10) is placed vertically on the hole side.

[0049] At this time, the extension tip (20) is positioned so that it can be induced to expand horizontally while being supported on the guide home (G) side on the lower side of the bit body (10).

[0050] Then, as shown in Fig. 6, the connecting rod (30) is inserted into the hollow portion (E) side of the bit body (10) to set the connection so that the expansion movement and rotational force transmission of the extension tip (20) are possible due to the contact interference of the connecting portion (34).

[0051] In this way, when the connection between the connecting rod (30) and the extension tip (20) is set and the rotational force is transmitted by pressing the head portion (32) of the connecting rod (30) downwards using an electric drill device (M) as shown in Fig. 7, the extension tip (20) rotates in a state in which horizontal expansion movement is induced by the contact interference of the connecting portion (34), and in connection with this, the bit body (10) can also rotate in the same direction.

[0052] Then, the inner lower surface of the anchor hole (H1) can be expanded and cut toward the outside by the rotational motion of the expansion tip (20), and as a result, an expansion catch groove (H2) can be formed in a horizontally expanded shape in communication with the hole side on the lower side of the anchor hole (H1).

[0053] The expansion catch groove (H2) can be formed to have various groove sizes in a way that controls the expansion movement state of the expansion tip (20) by the connecting rod (30).

[0054] In this way, by sequentially going through the work processes of Fig. 1, an anchor hole (H1) is formed on the concrete structure (C) side, and the hole forming work can be performed so that an expanded catch groove (H2) is integrally formed on the lower side of the anchor hole (H1).

[0055] In particular, when an anchor hole (H1) is formed with such an expansion catch groove (H2), as shown in Fig. 8, when a concrete destruction mode due to external force occurs after construction of a concrete expansion post-installed anchor (A, CEA: CONCRETE EXPANSION POST-INSTALLED ANCHOR) on the anchor hole (H1) side, a concrete rupture failure cross-section can be induced in the following form.

[0056] That is, the shape of the concrete fracture fracture cross-section is not an inverted triangle shape that can occur in a general anchor hole, but rather, as shown in Fig. 8, the occurrence of the fracture mode can be induced in the shape of an inverted trapezoid (inverted pyramid shape) in which the lower side is cut off and the upper surface area is expanded. This is induced and implemented by the fixed support force of the expanded catch groove (H2) formed expanded on the lower side of the anchor hole (H1).

[0057] Therefore, by installing a concrete expansion-type post-installation anchor (A) on the side of an anchor hole (H1) equipped with an expansion catch groove (H2), the anchor's fixation support capacity can be further secured, and thus, the safety and reliability of fixing various facilities using the anchor can be expected to be improved.

[0058] Accordingly, the present invention can provide a method for easily forming an anchor hole (H1) with an expansion catch groove (H2) for inducing expansion of a concrete rupture fracture cross-section by using an expansion cutting processing method using an expansion drill bit (B) as shown in FIGS. 5 to 7, when forming an anchor hole (H1) for installing a concrete expansion type post-installation anchor (A) on the side of a concrete structure (C).

Claims

1. A method of forming an anchor hole of a post-installation anchor into a concrete structure side in a state where expansion of the concrete rupture fracture section is possible. A step of forming an anchor hole in a vertical direction on the concrete structure side; and A step of forming a horizontally expanding hanging groove on the lower side of the anchor hole; Including, The step of forming the above-mentioned expansion groove is: A method for drilling a concrete structure for post-installation anchor construction, characterized in that an expansion engaging groove is formed on the lower side of the anchor hole by inducing expansion movement and rotation of the expansion drill bit while the expansion drill bit is inserted into the anchor hole side.

2. In claim 1, The step of forming the above-mentioned expansion groove is: Using the above expansion drill bit, the expansion catch groove is formed on the lower side of the above anchor hole. The above extension drill bit is, A method for drilling a concrete structure for installing a post-installation anchor, comprising: a bit body having a hollow portion and being detachably inserted into the anchor hole side; an extension tip arranged so as to induce expansion movement toward the outside from an end side of the bit body; and a connecting rod for being inserted into the hollow portion side of the bit body in a connected state capable of inducing expansion movement and rotation of the extension tip.

3. In claim 2, The step of forming the above-mentioned expansion groove is: Then, the bit body with the above extension tip placed is inserted into the anchor hole side. A method for drilling a concrete structure for constructing a post-installation anchor, characterized in that the connecting rod is inserted into the hollow portion of the bit body, and the connecting rod end side is rotated with an electric drill device so that the tip can be induced to expand and rotate by contact interference between the connecting rod end side and the expansion tip, thereby forming the expansion engaging groove on the lower side of the anchor hole by a cutting method through the induction of the expansion and rotation of the expansion tip.

4. In claim 2, The step of forming the above-mentioned expansion groove is: By inserting the connecting rod into the hollow part of the above-mentioned bit body, the connecting rod end side and the above-mentioned extension tip are set to a fitting connection state that allows expansion movement and rotation induction by contact interference. The above connecting rods are axially connected to each other in a detachable manner, A method for drilling a concrete structure for the construction of a post-installation anchor, characterized in that the connecting rods are set to be connected in a state where they can be engaged with each other in the rotational direction.

5. In claim 2, The step of forming the above-mentioned expansion groove is: A method for drilling a concrete structure for installing a post-installation anchor, characterized in that the connecting rod is inserted into the hollow portion side of the bit body, and the expansion movement of the expanding tip is induced by pressing pressure due to contact interference with the insertion end side of the connecting rod.

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