Anchor pin for placing shotcrete and fixing textile grid and method of constructing textile grid reinforced shotcrete using the same

Abstract

Provided are an anchor pin for placing shotcrete and fixing a textile grid and a method of constructing textile grid reinforced shotcrete using the same, wherein the anchor pin allows a textile grid reinforcement to be precisely disposed at a required position and, when shotcrete is placed, prevents a textile grid reinforcement from moving due to a driving pressure for precise construction so as to increase durability and safety of the concrete structure, allows primary and secondary shotcrete to be constructed while placing thicknesses thereof are visually checked so as to increase precision of construction, and allows the textile grid reinforcement to be disposed and fixed to accurately correspond to a shape of the concrete structure even when a lower portion of a slab, a wall, and a structure with a curved surface, such as a lining of a tunnel, are built.

Claims

1. A method of constructing textile grid reinforced shotcrete using an anchor pin, comprising: (a) driving and fixing an anchor pin in and to a surface of a concrete structure to be repaired and reinforced at a predetermined driving thickness; (b) placing primary shotcrete up to a lower separation node of a grid fixing part (130) of the anchor pin at a placing thickness of primary shotcrete; (c) insertion-mounting a textile grid reinforcement in a groove formed between nodes of a grid fixing part of the anchor pin; (d) placing secondary shotcrete up to an uppermost end of the anchor pin at a placing thickness of the secondary shotcrete; and (e) finishing an exposed surface and completing repair and reinforcement of the concrete structure, wherein the anchor pin comprises: a driving part serving as a front end part and driven in the concrete structure to be repaired and reinforced at the predetermined driving thickness; a middle body part that extends from an upper portion of the driving part in a cylindrical form so that the placing thickness of the primary shotcrete is checked; an upper body part that extends from an upper portion of the middle body part in a cylindrical form so that the placing thickness of the secondary shotcrete is checked; a driving depth limiting lateral node formed between the driving part and the middle body part to protrude in a ring shape and formed in a lateral direction to limit a driving depth of the driving part; and a grid fixing part comprising an upper separation node and a lower separation node that are formed between the middle body part and the upper body part to protrude in a ring shape, wherein a groove is formed between the upper separation node and the lower separation node in a lateral direction so that a textile grid reinforcement is insertion-mounted in the groove.

2. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein, in operation (a), the anchor pin is driven and fixed using an air tacker.

3. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 2, wherein, before operation (a), the anchor pin corresponding to a thickness of entire shotcrete is selected and loaded in the air tacker.

4. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein a driving number of anchor pins identical to the anchor pin is set based on a state and curvature of the concrete structure, a type of the textile grid reinforcement, and a thickness of shotcrete, and the anchor pins are driven at intervals of 20 cm.

5. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein an entire length of the anchor pin and each of the driving thickness and the placing thicknesses are determined based on an entire construction thickness of the primary shotcrete and the secondary shotcrete.

6. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein the anchor pin is formed of a non-corrosive steel material with strength sufficient to be driven in concrete.

7. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein the anchor pin is integrally manufactured in a nail shape.

8. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein the driving depth limiting lateral node and the grid fixing part of the anchor pin are formed in a form of a sleeve and fastened between the driving part and the middle body part and between the middle body part and the upper body part, respectively.

9. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein the middle body part of the anchor pin is formed between the driving depth limiting lateral node and the lower separation node of the grid fixing part and serves as a reference part with which the placing thickness of the primary shotcrete is visually checked.

10. The method of constructing textile grid reinforced shotcrete using an anchor pin of claim 1, wherein the upper body part of the anchor pin is formed from the upper separation node of the grid fixing part to the uppermost end of the anchor pin and serves as a reference part with which the placing thickness of the secondary shotcrete is visually checked.

11. A concrete structure repaired and reinforced by the method of constructing textile grid reinforced shotcrete using an anchor pin according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which:

(2) FIGS. 1a, 1b and 1c show views illustrating a general textile grid reinforcement and a structure reinforced thereby;

(3) FIGS. 2a and 2b show views illustrating a textile grid reinforcement produced through a weaving method;

(4) FIGS. 3a and 3b are views illustrating a front side and a lateral side on which a textile grid reinforcement according to a related art is mounted;

(5) FIGS. 4a to 4c are views illustrating construction of shotcrete according to the related art;

(6) FIG. 5 is a view illustrating a concrete structure reinforced by a deformed steel wire mesh according to the related art;

(7) FIG. 6 is an operation flowchart for describing a method of repairing and reinforcing a structure using a lattice-shaped fiber mesh and a cement matrix as a reinforcement according to the related art;

(8) FIGS. 7a and 7b show cross-sectional views illustrating an anchor pin for placing shotcrete and fixing a textile grid according to one embodiment of the present invention;

(9) FIG. 8 is a cross-sectional view illustrating shotcrete and a textile grid constructed using the anchor pin according to one embodiment of the present invention;

(10) FIGS. 9a and 9b show views illustrating the anchor pin, which is driven in a concrete structure, for placing shotcrete and fixing a textile grid according to one embodiment of the present invention;

(11) FIG. 10 is an operation flowchart of a method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention;

(12) FIGS. 11a to 11e are views for specifically describing the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention;

(13) FIG. 12 is a view illustrating a lower portion of a slab to which the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention is applied; and

(14) FIG. 13 is a view illustrating a lining of a tunnel to which the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention is applied.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

(15) Hereinafter, embodiments that are easily performed by those skilled in the art will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention may be implemented in several different forms and are not limited to embodiments described herein. In addition, parts irrelevant to description will be omitted in the drawings to clearly explain the embodiments of the present invention. Similar parts are denoted by similar reference numerals throughout this specification.

(16) Throughout the specification, when a portion “includes” an element, the portion may include the element or another element may be further included therein unless otherwise described.

(17) [Anchor Pin 100 for Placing Shotcrete and Fixing Textile Grid]

(18) FIGS. 7a and 7b show cross-sectional views illustrating an anchor pin for placing shotcrete and fixing a textile grid according to one embodiment of the present invention, wherein FIG. 7a shows a view illustrating an integrated anchor pin 100, FIG. 7b shows a view illustrating a separable anchor pin 100′, and FIG. 8 is a cross-sectional view illustrating shotcrete and a textile grid constructed using the anchor pin according to one embodiment of the present invention.

(19) Referring to FIGS. 7a, 7b and 8, the anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention includes a driving part 110, a driving depth limiting lateral node 120, a grid fixing part 130, a middle body part 140, and an upper body part 150.

(20) As shown in FIGS. 11a and 11b described below, as a front end part, the driving part 110 is driven in a concrete structure 210 to be repaired and reinforced to a predetermined driving thickness t1 using an air tacker 300. In this case, the concrete structure 210 to be repaired and reinforced may refer to a lower portion of a slab, a wall, or a lining of a tunnel with a curved surface, but the present invention is not limited thereto. Further, the air tacker is a tool that drives nails, staples, or the like using air pressure at a high speed to attach wood and wood, wood and plastic, wood and steel, wood and concrete, and the like. The air tacker may be very usefully utilized for interior work, aluminum sash work, or the like.

(21) The middle body part 140 extends from an upper portion of the driving part 110 in a cylindrical shape to check a placing thickness t2 of the primary shotcrete 220. In this case, a middle body part 140 is formed between the driving depth limiting lateral node 120 and a lower separation node 130a of the grid fixing part 130 and allows the placing thickness t2 of the primary shotcrete 220 to be visually checked.

(22) The upper body part 150 extends from an upper portion of the middle body part 140 in a cylindrical shape so that a placing thickness t3 of the secondary shotcrete 240 is checked. In this case, as shown by a symbol C in FIG. 8, the upper body part 150 is formed from the upper separation node 130b of the grid fixing part 130 to an uppermost end of the anchor pin and allows the placing thickness t3 of the secondary shotcrete 240 to be visually checked.

(23) As shown by a symbol A of FIG. 8, the driving depth limiting lateral node 120 protrudes in a ring shape between the driving part 110 and the middle body part 140 and is formed in a lateral direction to limit a driving depth of the driving part 110.

(24) As shown in FIG. 7a, the grid fixing part 130 is formed in the central portion of the anchor pin 100, includes an upper separation node 130b and a lower separation node 130a that are formed between the middle body part 140 and the upper body part 150 to protrude in a ring shape, and has a groove formed between the upper separation node 130b and the lower separation node 130a in a lateral direction so that the textile grid reinforcement 230 is insertion-mounted therein.

(25) That is, as shown as symbol B in FIG. 8, the grid fixing part 130 allows the textile grid reinforcement 230 to be inserted and fixed so that the primary shotcrete 220 is precisely placed to a primary shotcrete-placing thickness t2. Therefore, after the primary shotcrete 220 is placed, the secondary shotcrete 240 may be precisely placed to have the secondary shotcrete-placing thickness t3 which is as long as a length of the anchor pin 100 remaining for the secondary shotcrete 240 to be placed.

(26) The anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention may be loaded in the air tacker 300 and driven in the concrete structure 210.

(27) Further, the driving part 110, the middle body part 140, the upper body part 150, the driving depth limiting lateral node 120, and the grid fixing part 130 are formed of a non-corrosive steel material having a strength strong enough to be driven in the concrete, and as shown in FIG. 7a, the anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention may be an integrated anchor pin 100 and, for example, may be integrally formed in the form of a nail.

(28) Further, as shown in FIG. 7b, the anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention may be a separable anchor pin 100′, and for example, the driving depth limiting lateral node 120 and the grid fixing part 130 may be formed in the form of a sleeve to be fastened to the driving part 110, the middle body part 140, and the upper body part 150.

(29) Meanwhile, FIGS. 9a and 9b show views illustrating an anchor pin, which is driven in a concrete structure, for placing shotcrete and fixing a textile grid according to one embodiment of the present invention, wherein FIG. 9a is a cross-sectional view, and FIG. 9b is a front view.

(30) As shown in FIGS. 9a and 9b, the driving number of anchor pins 100 identical to the anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention is set based on a state and a curvature of the concrete structure 210 to be repaired and reinforced, a type and ductility of the textile grid reinforcement 230, and a thickness of the shotcrete, and as shown in FIG. 9b, the anchor pins 100 may be driven at intervals of about 20 cm, but the present invention is limited thereto.

(31) Finally, in the case of the anchor pin 100 for placing shotcrete and fixing a textile grid according to one embodiment of the present invention, the anchor pin 100 is loaded in the air tacker 300 so that constructability can be secured continuously and quickly. Further, the anchor pin 100 of the present invention may be formed of a non-corrosive steel material having strength sufficient to be driven in concrete, the shape of the anchor pin 100 may be formed in the form of a nail and constructed through hitting, drilling, and the like. However, to increase a speed of constructability, as shown in FIG. 11a described below, the anchor pins 100 can be quickly fixed to an existing concrete structure using the air tacker 300.

(32) Further, when the shotcrete is constructed, the placing thicknesses t2 and t3 of the primary and secondary shotcrete 220 and 240 can be visually checked using the lower separation node 130a and the upper separation node 130b of the grid fixing part 130 formed in each of the anchor pins, and the shotcrete can be precisely constructed. [Method of Constructing Textile Grid Reinforced Shotcrete Using an Anchor Pin 100]

(33) FIG. 10 is an operation flowchart of a method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention, and FIGS. 11a to 11e are views for specifically describing the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention.

(34) Referring to FIGS. 10 and 11a to 11e, the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention is as follows. First, as shown in FIG. 11a, the anchor pin 100 corresponding to a thickness of the entire shotcrete is selected and loaded in an air tacker 300 (step S100). In this case, the anchor pin 100 includes a driving part 110, a middle body part 140, an upper body part 150, a driving depth limiting lateral node 120, and a grid fixing part 130, wherein the driving part 110 that serves as a front end part is driven in a concrete structure 210 to be repaired and reinforced to a predetermined driving thickness t1, the middle body part 140 extends from an upper portion of the driving part 110 in a cylindrical shape so that a placing thickness t2 of primary shotcrete 220 is checked, the upper body part 150 extends from an upper portion of the middle body part 140 in a cylindrical shape so that a placing thickness t3 of secondary shotcrete 240 is checked, the driving depth limiting lateral node 120 is formed between the driving part 110 and the middle body part 140 to protrude in a ring shaped and formed in a lateral direction to limit a driving depth of the driving part 110, and the grid fixing part 130 includes an upper separation node 130b and a lower separation node 130a, which is formed between the middle body part 140 and the upper body part 150 to protrude in a ring shape and has a groove formed between the upper separation node 130b and the lower separation node 130a in a lateral direction so that the textile grid reinforcement 230 is insertion-mounted therein.

(35) Next, the anchor pin 100 is driven in and fixed to a surface of the concrete structure 210 to be repaired and reinforced to a predetermined driving thickness t2 using an air tacker 300 (step S120). That is, as shown in FIG. 11b, the anchor pin 100 is driven in and constructed on a surface of the concrete structure 210 to be repaired and reinforced using the air tacker 300. In this case, regardless of driving force of the air tacker 300, the driving depth limiting lateral node 120 is formed on the upper portion of the driving part 110 in a circular form to accurately adjust the driving depth t1 of the driving part 110 of the anchor pin 100. In this case, the driving number of anchor pins 100 identical to the anchor pins 100 is set based on a state and a curvature of the concrete structure 210 to be repaired and reinforced, a type and ductility of the textile grid reinforcement 230, and a thickness of shotcrete, and the anchor pins 100 may be driven at intervals of about 20 cm.

(36) Next, the primary shotcrete 220 is placed to a lower separation node 130a of the grid fixing part 130 of the anchor pin 100 at the placing thickness t2 of the primary shotcrete 220 (step S130). That is, as shown in FIG. 11c, when the primary shotcrete 220 is placed, the placing thickness t2 of the primary shotcrete is checked by the grid fixing part 130 formed in the middle part of the anchor pin 100 during construction, and thus precise construction should be conducted. Further, since the textile grid reinforcement 230 is fixed to support a construction pressure of the shotcrete, the grid fixing part 130 may be manufactured in a size roughly similar to that of a washer.

(37) Next, the textile grid reinforcement 230 is insertion-mounted in the groove between the nodes of the grid fixing part 130 of the anchor pin 100 (step S140). That is, as shown in FIG. 11d, the textile grid reinforcement 230 is fixedly inserted into the grid fixing part 130. In this case, when the textile grid reinforcement 230 is fixed, one portion of the textile grid reinforcement 230 is slightly pulled to be fixed to the grid fixing part 130, and thus flatness can be maintained.

(38) Next, the secondary shotcrete 240 is placed to an uppermost end of the anchor pin 100 at the placing thickness t3 of the secondary shotcrete 240 (step S150). That is, as shown in FIG. 11e, when the secondary shotcrete 240 is placed, the placing thickness t3 of the secondary shotcrete matches with the uppermost end of the anchor pin 100 during construction, and thus precise construction can be conducted.

(39) Next, a surface of the secondary shotcrete 240 is finished, and the repair and reinforcement of the concrete structure 210 is completed (step S150).

(40) In the method of constructing a textile grid reinforcement shotcrete using an anchor pin according to one embodiment of the present invention, an entire length t and each of the driving thickness t1 and the placing thicknesses t2 and t3 of the anchor pin 100 are determined based on an entire construction thickness of the primary and secondary shotcrete 220 and 240 designed according to repair and reinforcement purposes and the state of the concrete structure 210. In this case, the anchor pin 100 is formed of a non-corrosive steel material having strength sufficient to be driven in concrete and may be integrally manufactured in the form of a nail.

(41) Further, the driving depth limiting lateral node 120 and the grid fixing part 130 of the anchor pin 100 are formed in the form of a sleeve and fastened between the driving part 110 and the middle body part 140 of the anchor pin 100 and between the middle body part 140 and the upper body part 150 thereof, respectively. Further, the middle body part 140 of the anchor pin 100 is formed between the driving depth limiting lateral node 120 and the lower separation node 130a of the grid fixing part 130 so that placing thickness t2 of the primary shotcrete 220 can be visually checked, and the upper body part 150 of the anchor pin 100 is formed from the upper separation node 130b of the grid fixing part 130 to the uppermost end of the anchor pin so that the placing thickness t3 of the secondary shotcrete 240 can be visually checked.

(42) Meanwhile, FIG. 12 is a view illustrating a lower portion of a slab to which the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention is applied, and FIG. 13 is a view illustrating a lining of a tunnel to which the method of constructing textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention is applied.

(43) In the method of constructing a textile grid reinforced shotcrete using an anchor pin according to one embodiment of the present invention, the concrete structure 210 to be repaired and reinforced may refer to a lower portion 400 of a slab or a wall shown in FIG. 12 or a lining of a tunnel 500 with a curved surface shown in FIG. 13, but the present invention is not limited thereto.

(44) Accordingly, according to one embodiment of the present invention, the textile grid reinforcement is precisely disposed at a required position and prevented from moving due to a placing pressure when shotcrete is placed so that precise construction can be conducted, and thus durability and safety of the concrete structure can be increased. According to one embodiment of the present invention, the primary and secondary shotcrete can be constructed while the placing thicknesses thereof are visually checked, and thus precision of construction can be increased. Further, even when a structure with a curved surface, such as a lining of a tunnel, in addition to a lower portion of a slab or a wall are built, a textile grid reinforcement can be disposed and fixed to accurately correspond to the shape of the concrete structure.

(45) According to the present invention, a textile grid reinforcement is precisely disposed at a required position and prevented from moving due to a placing pressure when shotcrete is placed so that construction can be conducted precisely, and thus durability and safety of the concrete structure can be increased.

(46) According to the present invention, primary and secondary shotcrete are constructed while thicknesses of the placed shotcrete are visually checked, and thus precision of construction can be increased.

(47) According to the present invention, even when a structure having a curved surface, such as a lining of a tunnel, in addition to a lower portion of a slab and a wall are constructed, a textile grid reinforcement can be disposed and fixed to accurately correspond to a shape of the concrete structure.

(48) The above description of the present invention is only exemplary, and it should be understood by those skilled in the art that the invention may be performed in other concrete forms without changing the technological scope and essential features. Therefore, the above-described embodiments should be considered as only examples in all aspects and not for purposes of limitation. For example, each component described as a single type may be realized in a distributed manner, and similarly, components that are described as being distributed may be realized in a coupled manner. The scope of the present invention is defined not by the detailed description but by the appended claims and encompasses all modifications or alterations derived from meanings, the scope, and equivalents of the appended claims.