Method for installing covered tendon

Abstract

The present invention relates to a method for installing a covered tendon. The covered tendon comprises: an elongated cover body; a central wire positioned in the cover body; and a plurality of strands positioned between the cover body and the central wire. The method for installing a covered tendon comprises the steps of: arranging a preliminary wire corresponding to the covered tendon while installing a reinforcing bar assembly; pouring and curing concrete in the reinforcing bar assembly; and introducing the central wire and the strands into the preliminary wire.

Description

How to install a covered tendon

[0001] The present invention relates to a method for installing a covering tendon in which the use of a steel duct is excluded and damage to the covering is reduced.

[0002] The covering tendon is a tendon element that is generally composed of grease and 7-wire strands that serve to introduce tension and prevent corrosion inside a circular covering pipe made mainly of HDPE (High Density Polyethylene).

[0003] These covering tendons are used in bundles, but their self-weight is too heavy to be installed during the rebar assembly stage of a reinforced concrete structure. Therefore, during the rebar assembly stage, steel ducts are constructed to serve as passageways for the covering tendon bundles. After the concrete has been poured and cured to ensure sufficient structural rigidity, the heavy-duty covering tendon bundles are installed through these duct passages.

[0004] However, there is a problem that various types of significant damage to the cladding occur due to friction between the claddings or between the claddings and the steel duct during the process of lifting the cladding tendon into the steel duct.

[0005] Additionally, in some cases, it may be impossible to install the cladding tendon inside the steel duct due to friction caused by the weight of the cladding tendon beyond the cladding damage.

[0006] Accordingly, an object of the present invention is to provide a method for installing a covering tendon in which the use of a steel duct is excluded and damage to the covering is reduced.

[0007] The above object of the present invention is achieved by a method for installing a covering tendon, wherein the covering tendon includes a long covering body, a central wire positioned within the covering body, and a plurality of steel wires positioned between the covering body and the central wires, the method comprising the steps of: while installing a reinforcing bar assembly, arranging a preliminary wire corresponding to the covering tendon; pouring and hardening concrete into the reinforcing bar assembly; and introducing the central wire and the steel wire into the interior of the preliminary wire.

[0008] The above-mentioned preliminary line includes the above-mentioned covering; and a traction wire positioned within the above-mentioned covering. In the above-mentioned introduction step, the traction wire and the central wire can be connected, and the traction wire can be pulled to introduce the central wire and the main wire into the above-mentioned covering.

[0009] The above-mentioned traction wire includes a first protrusion extending outside the first end of the covering body; and a second protrusion extending outside the second end of the covering body, wherein one of the first protrusion and the second protrusion is coupled to the traction wire, and the other can be pulled.

[0010] The above traction wire and the above center wire can be connected by at least one method, such as using a two-way nut, screw connection, and couple.

[0011] The above-mentioned preliminary line further includes a space filler positioned between the covering body and the traction wire, which fixes the position of the traction wire; and a lubricating layer positioned between the outer surface of the space filler and the covering body, wherein the space filler can be discharged to the outside of the covering body during the traction step.

[0012] The above-mentioned reserve lines may be provided in multiple numbers adjacent to each other in the longitudinal direction to form a bundle of reserve lines.

[0013] The above-mentioned bundle of spare wires is fixed by a fixing member surrounding the circumference, and the spare wire located at the outermost end of the bundle of spare wires can be in direct contact with the concrete.

[0014] The above covering may be made of plastic material.

[0015] The above object of the present invention is achieved by a method for installing a covering tendon, comprising the steps of: installing a reinforcing bar assembly, arranging a preliminary wire corresponding to the covering tendon, wherein the preliminary wire includes a long covering body and a traction wire positioned within the covering body; pouring and hardening concrete into the reinforcing bar assembly; connecting one end of the traction wire to a composite body including a central wire and a plurality of steel wires surrounding the central wire; and introducing the composite body into the covering body by traction of the other end of the traction wire.

[0016] In the above connection, one end of the traction wire and the center wire can be connected.

[0017] The above-mentioned preliminary line further includes a space filler positioned between the covering body and the traction wire, which fixes the position of the traction wire; and a lubricating layer positioned between the outer surface of the space filler and the covering body, wherein the space filler can be discharged to the outside of the covering body during the traction step.

[0018] The above-mentioned reserve lines are provided in a plurality of lengthwise adjacent ones to form a reserve line bundle, and the reserve line bundle is fixed by a fixing member surrounding the circumference, and the reserve line located at the outermost end of the reserve line bundle can be in direct contact with the concrete.

[0019] According to the present invention, a method for installing a covering tendon is provided in which the use of a steel duct is excluded, thereby reducing damage to the covering.

[0020] Figure 1 is a flowchart showing a method for installing a covering tendon according to one embodiment of the present invention.

[0021] Figure 2 illustrates a composite used in a method for installing a covering tendon according to one embodiment of the present invention.

[0022] Figure 3 illustrates a preliminary wire and a bundle of preliminary wires used in a method for installing a covering tendon according to one embodiment of the present invention.

[0023] Figure 4 illustrates the connection of a preliminary line and a composite in a method for installing a covering tendon according to one embodiment of the present invention.

[0024] Figures 5 and 6 illustrate the pulling process in the method for installing a covering tendon according to one embodiment of the present invention.

[0025] FIG. 7 is a comparison of the cross sections of a preliminary line and a covering tendon in a method for installing a covering tendon according to one embodiment of the present invention.

[0026] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0027] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0028] In addition, the size and thickness of each component shown in the drawing are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown.

[0029] Hereinafter, a method for installing a covering tendon according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

[0030] FIG. 1 is a flowchart showing a method for installing a covering tendon according to one embodiment of the present invention.

[0031] First, prepare a complex of central wire and main wire (S10).

[0032] The complex includes a central wire positioned at the center, as shown in Fig. 5, and twisted steel wires surrounding the central wire.

[0033] In Fig. 2, the number of lecture lines is 7 including the center line, but it is not limited to this.

[0034] In the composite, the central wire is arranged to protrude from the other wires for the traction process described later.

[0035] The central wire and the main wire may be made of steel, but are not limited thereto.

[0036] Next, the rebar assembly is installed and the preliminary line is placed (S20).

[0037] The preliminary line includes a covering body, a traction wire positioned within the covering body, a space filler positioned between the covering body and the traction wire, and a lubricating layer, as shown in FIG. 3.

[0038] The casing is a long, hollow, circular pipe. The casing may be made of a resin such as, but is not limited to, HDPE.

[0039] The traction wire is located approximately at the center of the covering body and has a first protrusion and a second protrusion protruding outward from both ends of the covering body. The center wire will be located at the location of the traction wire in the future.

[0040] The traction wire will be connected to the central wire and transmit force to the reinforcement wire when the composite is installed in a traction manner within the cladding. To achieve this, the traction wire must have sufficient tensile strength and ductility.

[0041] Void fillers (temporary materials) fill voids within the cladding, preventing damage such as buckling caused by external pressure or forces during concrete pouring. Void fillers also secure space for future steel reinforcement.

[0042] The void filler must be lighter than the steel wire, yet possess adequate ductility to secure the space under external pressure, and sufficient ductility to accommodate the bending of the spare wire when installed. Specific materials for the void filler include, but are not limited to, glue.

[0043] The lubricating layer, which may be composed of grease, is located between the outer surface of the space filler and the inner surface of the covering body. The lubricating layer facilitates the discharge of the space filler to the outside of the covering body during the traction process.

[0044] The reserve wires are installed within the rebar assembly in the form of multiple overlapping reserve wire bundles, as shown in Figure 3. Fasteners are used to tie the reserve wire bundles together to ensure alignment and reinforcement of the reserve wire bundles. These fasteners prevent twisting between the reserve wires.

[0045] A plurality of fixed members may be used spaced apart for the spare wire bundle. The fixed members may be, but are not limited to, thin iron plates and wires.

[0046] The spare wire bundles feature internal void filler instead of steel wires, making them significantly lighter and more flexible than covered tendon bundles. This significantly improves the constructability of spare wire bundles. The spare wire bundles can be formed in an octagonal shape based on a regular hexagon, but are not limited thereto.

[0047] If the reserve wire is used in the form of a bundle of reserve wires, (1) resistance to external pressure or impact due to mutual restraint is increased, (2) the installation location of the future installed steel wires and the phase between the steel wires are clarified, making maintenance easier, and it is easy to analyze the cause of problems that may occur during installation / tensioning, etc., and (3) tangling between individual steel wires or reserve wires is eliminated.

[0048] Reinforcement assemblies are used to manufacture reinforced concrete structures, and their form can vary depending on the circumstances. The length, arrangement, location, and number of reserve wire bundles can vary depending on the reinforcement needs of the reinforced concrete structure.

[0049] Next, concrete is poured and hardened (S30).

[0050] Since the reserve wire bundles are located within the rebar assembly without the use of separate steel ducts, the concrete is poured directly onto the reserve wire bundles. Consequently, at least the reserve wires located on the perimeter of the reserve wire bundles are in direct contact with the concrete.

[0051] When the concrete has hardened, connect the traction wire and the center wire (S40).

[0052] Specifically, as shown in Fig. 4, the first protrusion of the traction wire and the protrusion of the central wire are connected.

[0053] Connection methods include, but are not limited to, two-way nuts, screw connections, and couplers. Depending on the connection method, threads may be formed on both protrusions. The connection structure must be smaller than the inner diameter of the cover.

[0054] Finally, the composite is introduced into the casing of the spare line by pulling the tow wire (S50).

[0055] Towing is performed by connecting the second protrusion of the towing wire to a towing device such as a winch and driving the towing device.

[0056] As shown in FIGS. 5 and 6, the traction wire and space filler are discharged to the outside of the covering body by traction, and the steel wire including the central wire is positioned in its place. This process is effectively performed without damage to the covering body by the lubricating layer.

[0057] The final formed cladding tendon is shown in the right figure of Fig. 7. The cladding is a preliminary cladding, and the steel wires, including the central wire, are introduced into the cladding through the traction of the composite.

[0058] According to the present invention, since a separate steel duct is not used for installing the covering tendon bundle, problems such as damage to the covering body caused by the steel duct are reduced.

[0059] The present invention relates to a method for facilitating the installation of a covering tendon in a reinforced concrete structure, wherein instead of using a steel wire having a heavy self-weight and low flexibility, the interior of an HDPE pipe is filled with a combination of a space filler and a traction wire to lighten the self-weight and improve flexibility, so that a bundle of spare wires can be installed at the stage of assembling the steel wire.

[0060] According to the present invention, existing steel ducts are unnecessary, and additional grouting work to fill spaces other than the covering tendons within the steel duct is also unnecessary, thereby shortening the process and reducing construction uncertainty.

[0061] The above-described examples serve as illustrative examples of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate the potential for various modifications and implementations of the present invention. Therefore, the technical protection scope of the present invention should be defined by the appended claims.

Claims

1. In the method of installing the covering tendon, The above-mentioned covering tendon comprises a long covering body, a central wire positioned within the covering body, and a plurality of steel wires positioned between the covering body and the central wire. A step of placing a preliminary line corresponding to the covering tendon while installing the reinforcing bar assembly; A step of pouring and hardening concrete into the above-mentioned reinforcing bar assembly; and An installation method comprising a step of introducing the central wire and the main wire into the interior of the preliminary wire.

2. In paragraph 1, The above reserve line is, The above covering; and A traction wire positioned within the above covering body is included, In the above introduction stage, An installation method of connecting the above-mentioned traction wire and the above-mentioned central wire, pulling the above-mentioned traction wire, and introducing the above-mentioned central wire and the above-mentioned steel wire into the above-mentioned covering.

3. In paragraph 2, The above traction wire, A first protrusion extending to the outside of the first end of the above-mentioned covering body; and Includes a second protrusion extending to the outside of the second end of the above-mentioned covering body, An installation method in which one of the first protrusion and the second protrusion is coupled to the traction wire and the other is traction.

4. In paragraph 3, An installation method in which the above-mentioned traction wire and the above-mentioned central wire are connected by at least one method, such as using a two-way nut, screw connection, and couple.

5. In paragraph 3, The above reserve line is, A space filler positioned between the above covering and the above traction wire, and fixing the position of the above traction wire; and Further comprising a lubricating layer positioned between the outer surface of the space filler and the covering body, An installation method in which the above space filler is discharged to the outside of the covering body during the traction step.

6. In paragraph 5, An installation method in which the above-mentioned reserve lines are provided in multiple numbers adjacent to each other in the longitudinal direction, thereby forming a bundle of reserve lines.

7. In paragraph 6, The above bundle of spare wires is fixed by a fixing member that wraps around the circumference, An installation method in which the reserve wire located at the outermost end of the above reserve wire bundle is in direct contact with the above concrete.

8. In paragraph 7, An installation method in which the above covering is made of plastic.

9. In the method of installing the covering tendon, A step of installing a reinforcing bar assembly, wherein a preliminary line corresponding to the covering tendon is arranged, wherein the preliminary line comprises a covering body extending in length and a traction wire positioned within the covering body; A step of pouring and hardening concrete into the above-mentioned reinforcing bar assembly; A step of connecting one end of the above traction wire to a complex including a central wire and a plurality of steel wires surrounding the central wire; and An installation method comprising a step of introducing the complex into the covering body by pulling the other end of the pulling wire.

10. In paragraph 9, In the above connection, An installation method in which one end of the above-mentioned traction wire and the above-mentioned central wire are connected.

11. In paragraph 10, The above reserve line is, A space filler positioned between the above covering and the above traction wire, and fixing the position of the above traction wire; and Further comprising a lubricating layer positioned between the outer surface of the space filler and the covering body, An installation method in which the above space filler is discharged to the outside of the covering body during the traction step.

12. In paragraph 11, The above-mentioned reserve lines are provided in multiple numbers adjacent to each other in the longitudinal direction, forming a reserve line bundle. The above bundle of spare wires is fixed by a fixing member that wraps around the circumference, An installation method in which the reserve wire located at the outermost end of the above reserve wire bundle is in direct contact with the above concrete.

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