KR20140026693A - Sleeve for precast concrete and conneting method by the same - Google Patents

Sleeve for precast concrete and conneting method by the same Download PDF

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Publication number
KR20140026693A
KR20140026693A KR1020120092064A KR20120092064A KR20140026693A KR 20140026693 A KR20140026693 A KR 20140026693A KR 1020120092064 A KR1020120092064 A KR 1020120092064A KR 20120092064 A KR20120092064 A KR 20120092064A KR 20140026693 A KR20140026693 A KR 20140026693A
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KR
South Korea
Prior art keywords
sleeve
precast concrete
gfrp
rebar
glass fiber
Prior art date
Application number
KR1020120092064A
Other languages
Korean (ko)
Inventor
심종성
김용재
성병길
박재욱
한성식
조청휘
이태왕
Original Assignee
한양대학교 에리카산학협력단
한림에코텍 주식회사
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Application filed by 한양대학교 에리카산학협력단, 한림에코텍 주식회사 filed Critical 한양대학교 에리카산학협력단
Priority to KR1020120092064A priority Critical patent/KR20140026693A/en
Publication of KR20140026693A publication Critical patent/KR20140026693A/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
    • E04B1/04—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
    • E04B1/043—Connections specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The present invention relates to a connection sleeve for glass fiber reinforced plastic rebar (GFRP rebar) of precast concrete and a method of connecting precast concrete using the same. Glass fiber reinforced plastic rebar (GFRP rebar) connection sleeve of the precast concrete of the present invention, the groove is formed therein, the glass fiber reinforced plastic rebar (Glass Fiber Reinforced Plastic rebar) is inserted into the groove is fixed Sleeve body; And a male shaft provided at one end of the sleeve body to extend in the longitudinal direction of the sleeve body.

Description

Connection sleeve for glass fiber reinforced plastic riba of precast concrete and precast concrete connection method using the same {SLEEVE FOR PRECAST CONCRETE AND CONNETING METHOD BY THE SAME}

The present invention relates to a connection sleeve dedicated to glass fiber reinforced plastic ribs (GFRP rebar) of precast concrete and a method of connecting precast concrete using the same, and more specifically, to connection of glass fiber reinforced plastic ribs (GFRP rebar). This makes it easy to apply GFRP rebars to precast concrete, thus connecting dedicated fiberglass-reinforced plastic rebars to precast concrete, which can improve tensile strength while solving corrosion problems. It relates to a sleeve and a method of connecting precast concrete using the same.

Precast concrete or precast concrete product (hereinafter referred to as precast concrete) refers to concrete or concrete product manufactured in a fully maintained factory.

Since precast concrete is pre-fabricated at the factory and supplied to the site, when precast concrete is used, there are advantages such as shortening of air, reduction of construction cost, ease of quality control, and durability.

In using such precast concrete (or its products), a connecting sleeve is used to connect the vertical member for the precast concrete structure to the bottom plate.

In particular, the connecting sleeve is mainly used to connect the precast concrete columns and the precast concrete walls, which are vertical members, to each other.

On the other hand, in conventional precast concrete, rebar has been in charge of all of the tension members. In other words, when producing precast concrete, rebar has been reinforced together with aggregate and cement.

However, it has been pointed out that the existing reinforcing bars are vulnerable to durability, such as salt and carbonation freeze thaw.

Particularly, in the case of precast concrete, the role of the tension member is very important structurally, so the problem of durability is more highlighted.

As a solution to the durability problem, a method of using glass fiber reinforced plastic rebar, which is independent of salt and carbonation freezing and thawing, has been proposed. Thus, in Canada, overseas bridges and roads It is actively used.

However, when GFRP riba is used as a tension member, since GFRP riba cannot be connected with a connection sleeve that has been used previously, that is, it is not possible to connect a GFRP riba only. Since the sleeve is not even developed, it is urgent to research and develop it.

Korean Intellectual Property Office Application No. 10-1992-0013663

An object of the present invention, by enabling the connection of glass fiber reinforced plastic ribs (GFRP rebar) it is possible to easily apply GFRP riba to precast concrete, thereby improving the tensile strength while solving the corrosion problem The present invention provides a connection sleeve for glass fiber reinforced plastic rebar (GFRP rebar) of precast concrete and a method of connecting precast concrete using the same.

The present invention includes a sleeve body having a groove formed therein and having a glass fiber reinforced plastic rebar inserted into the groove and fixed thereto; And a male-threaded shaft provided to extend in the longitudinal direction of the sleeve body at one end of the sleeve body, and provides a connection sleeve dedicated to GFRP rebar of precast concrete. do.

The groove portion of the sleeve body may be formed with a female thread portion, the GFRP riba may be inserted into the groove portion, and then fixed with an epoxy resin, the male shaft may be connected to the female thread portion of the other sleeve adjacent to the thread. have.

In this case, the sleeve body may be combined with the precast concrete.

On the other hand, the present invention, GFRP rebar (Glass Fiber Reinforced Plastic rebar) having a sleeve body having a groove portion formed therein, and a male shaft that is provided to extend in the longitudinal direction of the sleeve body at one end of the sleeve body ) Providing a dedicated connecting sleeve; Inserting a GFRP riba into the groove of the sleeve body; Filling an epoxy resin into the groove to fix the GFRP riba within the groove; And screwing the male shaft of the GFRP riba dedicated connecting sleeve to the female threaded portion of another adjacent sleeve. Provided is a precast concrete connection method using a connection sleeve.

And a female thread portion may be formed in the groove portion of the sleeve body, the sleeve body may be combined with precast concrete.

According to the present invention, by connecting the glass fiber reinforced plastic rib (GFRP rebar) it is possible to easily apply the GFRP riba to precast concrete, thereby improving the tensile strength while solving the corrosion problem It works.

Figure 1a is a perspective view of a connecting sleeve dedicated to glass fiber reinforced plastic rebar (GFRP rebar) of precast concrete according to an embodiment of the present invention.
1B is a longitudinal cross-sectional view of FIG. 1A.
Figure 2 is a state diagram of use of the connecting sleeve shown in Figure 1a.
3 is a modeling shape according to the vertical load of the connecting sleeve of precast concrete.
4 is a finite element analysis image of the tensile stress at the surface portion according to the vertical load of the connecting sleeve of precast concrete.
5 is a finite element analysis image of the internal tensile stress according to the vertical load of the connecting sleeve of precast concrete.
6 is an enlarged image of FIG. 5.
7 is a finite element analysis image of a deformation shape according to a horizontal load of a connecting sleeve of precast concrete.
8 is a finite element analysis image of the internal stress according to the horizontal load of the connecting sleeve of precast concrete.
9 is a finite element analysis image of the tensile stress at the surface portion according to the horizontal load of the connecting sleeve of precast concrete.
10 is a flowchart of a precast concrete connection method using a connection sleeve according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1a is a perspective view of a connection sleeve dedicated to glass fiber reinforced plastic rebar (GFRP rebar) of precast concrete according to an embodiment of the present invention, Figure 1b is a longitudinal cross-sectional view of Figure 1a, and Figure 2 is the connection shown in Figure 1a It is a state diagram of use of a sleeve.

Referring to these drawings, the glass fiber reinforced plastic ribs (GFRP rebar) dedicated connection sleeve 100 of the precast concrete according to an embodiment of the present invention, the glass fiber reinforced plastic ribs instead of the conventional rebar when manufacturing precast concrete When using a glass fiber reinforced plastic rebar 101, the GFRP rebar 101 is connected, and includes a sleeve body 110 and a male shaft 130.

For reference, glass fiber reinforced plastic (GFRP) is a material combining an aromatic nylon fiber such as glass fiber, carbon fiber, Kevlar and thermosetting resin such as unsaturated polyester and epoxy resin. Its advantages are stronger than iron, lighter than aluminum, and easier to process without rust. The most popular method is to reinforce glass fibers processed to unsaturated polyester with a diameter of 0.1 mm or less. This is because it is resistant to external impact and has a very high tensile strength.

Usually, glass fiber reinforced plastic is called FRP, but it is also called glass fiber reinforced plastic (GFRP) when distinguished from carbon fiber reinforced plastic (CFRP).

Glass fiber reinforced plastics have been in use since the early 1940s, and carbon fibers superior to glass fibers have emerged since the 1960s and have been combined with plastics to replace metals and ceramics.

The advantages are light weight, durability, impact resistance, abrasion resistance, etc., are not rust, not deformed by heat, and easy to process. Building materials such as this embodiment, the body of the boat, skiing supplies, household tubs, helmets, tennis rackets, chairs, aircraft parts, etc. are used in various products necessary for life.

The groove 120 is formed inside the sleeve body 110. As shown in FIG. 2, the GFRP riba 101 may be partially inserted into the groove 120, and after insertion, the GFRP riba 101 may be fixed in the groove 120 by an epoxy resin (A).

The female screw portion 121 is formed in the groove portion 120 of the sleeve body 110. The female screw portion 121 may be used when the connecting sleeve 100 is to be continuously connected, or when a male screw portion (not shown) of another adjacent sleeve 200 is connected.

The male screw shaft 130 is provided to extend in the longitudinal direction of the sleeve body 110 at one end of the sleeve body 110.

Male threaded shaft 130 is used when threadedly coupled to female threaded portion 210 of another sleeve 200 adjacent to it, as shown in FIG.

As such, the connecting sleeve 100 of the present embodiment may be connected to the GFRP riba 101 and then connected to another neighboring sleeve 200 to interconnect the precast concretes.

On the other hand, the connecting sleeve 100 of the present embodiment should be structurally safe because it is used in the connection portion between the precast concrete pillars, for example, the precast concrete pillar and the precast concrete wall, which are vertical members, to be connected to each other. .

3 to 9, the safety of the connecting sleeve 100 was also verified by examining the situation at the time of construction as a general structural analysis program.

Verification of the connection sleeve 100 of the present embodiment was verified using the results of the general purpose structural analysis program for civil engineering applying the finite element analysis method, the image is shown in Figures 3-6. For reference, FIGS. 3 to 6 are views in which the GFRP riba 101 is removed in FIG. 2, and reference numerals are omitted.

Figure 3 is a modeling shape according to the vertical load of the connecting sleeve of precast concrete, Figure 4 is a finite element analysis image of the tensile stress of the surface portion according to the vertical load of the connecting sleeve of precast concrete, Figure 5 is a connecting sleeve of precast concrete Finite element analysis image of internal tensile stress according to the vertical load of Fig. 6 is an enlarged image of Fig. 5, Fig. 7 is a finite element analysis image of the deformation according to the horizontal load of the connecting sleeve of precast concrete, Fig. 8 is a precast The finite element analysis image of the internal stress according to the horizontal load of the connecting sleeve of concrete, and Figure 9 is a finite element analysis image of the tensile stress of the surface portion according to the horizontal load of the connecting sleeve of precast concrete.

As shown in FIGS. 3 to 6, finite element analysis was primarily performed for the safety review of the connecting sleeve 100.

For the finite element analysis, MIDAS FEA was used for detailed nonlinear analysis of the material. The boundary conditions and working loads of the analysis were set by non-contraction mortar and epoxy bulbs.

As a result of the analysis of the vertical tensile load, no stress exceeding the yield strength (500MPa) of the material of the connecting sleeve 100 was generated in all elements, and the maximum stress calculated by the analysis was 398MPa. Until now, it is determined that the destruction of the connection sleeve 100 itself does not occur.

7 to 9, the stress at the surface portion was calculated to be higher on the side of the load action direction due to the horizontal load, and was greater in the general sleeve than the connecting sleeve 100. The internal stress showed the maximum value at the interface as well as the deformation.

As a result of the analysis of the horizontal tensile load, no stress exceeding the yield strength (500MPa) of the sleeve material occurred in all the elements, and the maximum stress calculated by the analysis was 349MPa.

9 is a flowchart of a precast concrete connection method using a connection sleeve according to an embodiment of the present invention.

Referring to this figure and FIG. 2 together, in the precast concrete connection method using the connection sleeve according to the present embodiment, providing a connection sleeve 100 dedicated for GFRP riba shown in FIGS. 10A to 2 (S10). And partially inserting the GFRP riba 101 into the groove 120 of the sleeve body 110 (S20) and filling the GFRP riba 101 with the epoxy resin A into the groove 120. Fixing in the groove portion 120 (S30), and screwing the male threaded shaft 130 of the GFRP riba dedicated connection sleeve 100 to the female threaded portion 210 of the other sleeve 200 adjacent to (S40).

In this way, the connection sleeve 100 can be connected to the GFRP riba 101 exclusively, and then connected to the GFRP riba 101, and then reconnected with another neighboring sleeve 200 to easily connect the precast concrete. Can be done.

The connection sleeve 100 of the present embodiment is applicable to the civil engineering and construction fields that connect the vertical members of the precast concrete, such as columns, walls, and the like in the field.

That is, it is possible to apply to all precast concrete vertical members, such as columns and walls, which were previously produced in a factory using rebars, and in particular, even if GFRP riba 101 is used instead of rebars, it is sufficient to apply.

Of course, the scope of the present invention is not limited thereto, and thus, the present invention may be applied to connection or assembly of not only vertical members but also horizontal members among precast concrete (or products thereof).

Thus, the connection sleeve 100 of the present embodiment is suitable for the connection of the GFRP riba 101, it is good to apply the GFRP riba in many ways superior to the reinforcement in the production of precast concrete.

As such, according to the present embodiment, the GFRP riba 101 can be easily connected to the precast concrete by allowing the connection of the GFRP riba 101, thereby improving the tensile force while solving the corrosion problem. You can do it.

In particular, by being able to easily apply the GFRP riba 101 to the precast concrete, there is an advantage in the salt and neutralization than the case of conventionally used reinforcing bar in the durability performance basically.

Therefore, since it is harmless from the risk of corrosion, there is an advantage that the use of GFRP riba 101 in the long-term structure and maintenance is more efficient than the rebar.

In addition to durability, the structural part GFRP riba (101) has the advantage of excellent structural strength because the tensile strength is higher than the rebar.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: connecting sleeve 101: GFRP riba
110: sleeve body 120: groove
121: female thread portion 130: male threaded shaft

Claims (6)

A groove body formed therein and having a glass fiber reinforced plastic rebar (GFRP rebar) inserted into the groove to fix the sleeve body; And
Connection sleeve for a glass fiber reinforced plastic rebar (GFRP rebar) of precast concrete, characterized in that it comprises a male shaft extending from the one end of the sleeve body in the longitudinal direction of the sleeve body.
The method according to claim 1,
A female thread portion is formed in the groove portion of the sleeve body,
The GFRP riba is inserted into the groove, and then fixed with epoxy resin,
The male shaft is connected to the female threaded portion of the other sleeve adjacent to the glass fiber reinforced plastic rib (GFRP rebar) dedicated sleeve of precast concrete.
The method according to claim 1,
The sleeve body is connected to the precast concrete, glass fiber sensitized plastic ribs (GFRP rebar) connection sleeve of the precast concrete.
A connecting sleeve for GFRP rebar (Glass Fiber Reinforced Plastic rebar) having a sleeve body having a groove portion formed therein and a male shaft extending from the one end of the sleeve body in the longitudinal direction of the sleeve body is provided. Doing;
Inserting a GFRP riba into the groove of the sleeve body;
Filling an epoxy resin into the groove to fix the GFRP riba within the groove; And
And connecting the male shaft of the GFRP riba dedicated connecting sleeve to the female threaded portion of another adjacent sleeve by screwing the glass fiber reinforced plastic rib of the precast concrete (GFRP rebar). Precast concrete connection method using sleeve.
The method of claim 4,
The sleeve body is a precast concrete connection method using a glass fiber reinforced plastic rib (GFRP rebar) connection sleeve of precast concrete, characterized in that coupled to the precast concrete.
The method of claim 4,
The groove portion of the sleeve body is characterized in that the female thread is formed, precast concrete connection method using a glass fiber reinforced plastic rib (GFRP rebar) connection sleeve of precast concrete.
KR1020120092064A 2012-08-23 2012-08-23 Sleeve for precast concrete and conneting method by the same KR20140026693A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079065A (en) * 2016-07-28 2016-11-09 安徽省建筑科学研究设计院 A kind of attachment structure of glass fiber-reinforced polymer and reinforcing bar and attaching method thereof
CN110258966A (en) * 2019-07-18 2019-09-20 西南科技大学 Material muscle connection sleeve is answered in a kind of resistance to plucking fiber reinforcement
CN113389389A (en) * 2021-05-25 2021-09-14 中国一冶集团有限公司 Righting device for screwing up sleeve connection steel bar
KR102639740B1 (en) 2022-12-27 2024-02-22 다산기업 주식회사 Glass Fiber Reinforced Polymer Reinforcement Socket with Binding Confirmation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079065A (en) * 2016-07-28 2016-11-09 安徽省建筑科学研究设计院 A kind of attachment structure of glass fiber-reinforced polymer and reinforcing bar and attaching method thereof
CN110258966A (en) * 2019-07-18 2019-09-20 西南科技大学 Material muscle connection sleeve is answered in a kind of resistance to plucking fiber reinforcement
CN110258966B (en) * 2019-07-18 2024-04-26 西南科技大学 Anti-pulling fiber reinforced composite bar connecting sleeve
CN113389389A (en) * 2021-05-25 2021-09-14 中国一冶集团有限公司 Righting device for screwing up sleeve connection steel bar
KR102639740B1 (en) 2022-12-27 2024-02-22 다산기업 주식회사 Glass Fiber Reinforced Polymer Reinforcement Socket with Binding Confirmation

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