KR20080057675A - Spacer for tensile test of steel strand for prestressed concrete - Google Patents

Spacer for tensile test of steel strand for prestressed concrete Download PDF

Info

Publication number
KR20080057675A
KR20080057675A KR1020060131264A KR20060131264A KR20080057675A KR 20080057675 A KR20080057675 A KR 20080057675A KR 1020060131264 A KR1020060131264 A KR 1020060131264A KR 20060131264 A KR20060131264 A KR 20060131264A KR 20080057675 A KR20080057675 A KR 20080057675A
Authority
KR
South Korea
Prior art keywords
tensile test
strand
metal plate
steel strand
friction
Prior art date
Application number
KR1020060131264A
Other languages
Korean (ko)
Inventor
박종철
송진화
Original Assignee
재단법인 포항산업과학연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 재단법인 포항산업과학연구원 filed Critical 재단법인 포항산업과학연구원
Priority to KR1020060131264A priority Critical patent/KR20080057675A/en
Publication of KR20080057675A publication Critical patent/KR20080057675A/en

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

A spacer for a tensile test of a steel strand for prestressed concrete is provided to increase in reliability of measured data and to reduce time and cost for the tensile test by efficiently preventing damage to a holder of the steel strand. A spacer for a tensile test of a steel strand(1) for prestressed concrete includes an insertion material(10). The insertion material has a metal plate and a friction resistive layer. The metal plate, made of Al, Al alloy, Cu, or Cu alloy, is transformable by load for increasing a contact area, preventing unwinding of the steel strand, and increasing a friction force. The friction resistive layer is formed on a side of the metal plate to increase the friction force and prevent a holder of the steel plate from sliding on the metal plate.

Description

ＰＣ 강연선의 인장시험용 삽입재{Spacer for tensile test of steel strand for prestressed concrete}   Spacer for tensile test of steel strand for prestressed concrete

도 1은 종래의 인장시험시 물림부에 대한 개략도이다.1 is a schematic diagram of a bite in a conventional tensile test.

도 2는 종래의 인장시험에 사용된 보호용 스틸 판재의 사시도이다.2 is a perspective view of a protective steel plate used in a conventional tensile test.

도 3은 본 발명에 따른 삽입재의 단면에 대한 일례도이다Figure 3 is an example of a cross section of the insert according to the present invention.

도 4는 본 발명에 따른 PC 강연선의 인장시험시 물림부의 모식도이다.Figure 4 is a schematic diagram of the bite portion during the tensile test of the PC strand according to the present invention.

-도면의 주요부분에 대한 부호의 설명-Explanation of symbols on the main parts of the drawing

1 : PC 강연선 2 : 인장시험기 그립(grip)1: PC strand 2: Tensile tester grip

3 : 스틸 삽입재 3: steel insert

10..본 발명의 삽입재10. Insert material of the present invention

11 : 금속판재 12: 마찰저항층11: metal plate 12: frictional resistance layer

12a:수지필름 12b:마찰입자 12a: resin film 12b: friction particles

본 발명은 PC 강연선 시편의 물림부와 인장시험기의 그립의 사이에 설치되는 PC강선의 보호용 삽입재에 관한 것으로, 보다 상세하게는, 인장시험기의 그립(grip)으로부터 손상을 받은 시편의 물림부가 파단이 일어나는 것을 방지할 수 있는 삽입재에 관한 것이다. The present invention relates to a protective insert for PC steel wire, which is installed between the bite portion of the PC strand wire specimen and the grip of the tensile tester, and more specifically, the bite portion of the specimen damaged from the grip of the tensile tester is broken. It relates to an insert that can prevent this from happening.

PC 강연선은 2개, 3개, 7개 및 19개의 소선(PC 강선)을 꼬아 만든 연선으로 교량, 건축, 앵커(Anchor) 등에 널리 사용되며, 토목·건축분야에서는 없어서는 안될 매우 중요한 자재이다. 일반적으로, PC 강연선의 제품검사를 위해 인장시험을 실시한다. 도 1에 도시한 바와 같이 꼬아서 만든 PC 강연선의 특성상 그립 물림부가 균일하지 않게 되어 물림부가 풀어지거나 끊어지는 현상 때문에 제품의 인장강도 측정에 많은 지장을 초래한다.PC strands are twisted strands made of 2, 3, 7 and 19 stranded wires (PC steel strands). They are widely used in bridges, construction, and anchors, and are indispensable in the field of civil engineering and construction. Generally, tensile tests are to be carried out for the inspection of PC strands. As shown in FIG. 1, the grip bite becomes uneven due to the characteristics of the twisted PC strand, which causes a lot of trouble in measuring the tensile strength of the product due to the phenomenon that the bite is released or broken.

종래에는 도 2에 도시한 바와 같이, 인장시험기 그립에 의해 PC 강연선 물림부 표면이 손상되는 것을 방지하기 위해 스틸 판재(3)를 인장시험기 그립과 물림부 사이에 설치하여 사용하고 있다. 그러나, PC 강연선과 스틸 판재 사이에서 미끄러짐이 발생하고, 또한 미끄러짐을 방지하기 위해 그립의 하중을 증가시키면 PC 강연선에 과도한 하중이 가해져 물림부에서 파단이 발생한다. 파단이 발생하지 않더라도 시험규격에서 규정하는 표점거리(gauge length)에서 대부분 끊어지지 않기 때문에 데이터의 신뢰도가 떨어진다. 따라서 시험규격에 부합하는 인장강도 데이터를 구하기 위해서는 많은 수의 실험을 실시해야 하기 때문에, 시간적, 경제적 손실이 많이 발 생되고 있다.Conventionally, as shown in FIG. 2, in order to prevent the PC strand wire bite surface from being damaged by the tension tester grip, the steel plate 3 is provided between the tension tester grip and the bite part. However, slip occurs between the PC strand and the steel plate, and if the grip load is increased to prevent the slip, excessive load is applied to the PC strand and breakage occurs at the bite portion. Even if no fracture occurs, the reliability of the data is poor because most breaks are not made at the gauge length specified in the test standard. Therefore, in order to obtain tensile strength data meeting the test standard, a large number of experiments have to be carried out, resulting in a large amount of time and economic losses.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위한 것으로서, PC강연선 시편의 물림부와의 접촉면적을 증가시키면서 마찰력을 증가시킬 수 있는 PC강연선의 인장시험용 삽입재를 제공하는데, 그 목적이 있는 것이다. 본 발명에 따라 제공되는 삽입재는 인장시험기 그립의 하중을 높이지 않고도 PC 강연선과 보호용 판재 사이의 마찰력을 충분히 확보 할 수 있게 함으로써 물림부에서 파단이 일어나는 것을 방지할 수 있어 인장시험을 쉽게 실시 될 수 있는 것이다.The present invention is to solve the conventional problems as described above, to provide an insertion material for tensile testing of PC strands that can increase the friction while increasing the contact area with the bite portion of the PC strands specimens, an object thereof is to provide. . Insert material provided according to the present invention can be secured enough to secure the friction force between the PC strand and the protective plate without increasing the load of the tensile tester grip to prevent the fracture from occurring in the bite portion can be easily carried out a tensile test It is.

상기 목적을 달성하기 위한 본 발명의 삽입재는, PC강연선 시편의 물림부와 인장시험기의 그립의 사이에 설치되는 PC강선의 보호용 삽입재이고, Insertion material of the present invention for achieving the above object is a protective insert for PC steel wire is installed between the grip portion of the PC strand wire specimen and the grip of the tensile tester,

상기 인장시험기 그립의 압하력에 의해 변형 가능한 금속판재와 A metal plate deformable by the pressing force of the tension tester grip;

이 금속판재의 일면에 형성되어 상기 PC강연선과의 마찰력을 부여해주는 마찰저항층을 구비하는 것이다. It is provided with a frictional resistance layer formed on one surface of the metal sheet material to impart a friction force with the PC strand.

본 발명의 일실시예에 따르면 상기 금속판재는 Al, Al합금, Cu, Cu합금의 그룹에서 선택될 수 있다. According to an embodiment of the present invention, the metal plate may be selected from the group of Al, Al alloy, Cu, Cu alloy.

또한, 본 발명의 일실시예에 따르면 상기 마찰저항층은 고분자수지 필름에 마찰입자가 결합제에 의해 부착될 수 있으며, 상기 마찰입자는 금강사가 가장 바람직하다. In addition, according to one embodiment of the present invention, the frictional resistance layer may be attached to the friction particles by the binder to the polymer resin film, the friction particles are most preferably a gold steel yarn.

이하, 본 발명을 상세히 설명한다. Hereinafter, the present invention will be described in detail.

이하, 첨부된 도면을 참조하여 본 발명의 실시형태를 설명한다. 여기서 설명되는 본 발명의 실시형태는 여러 가지 다른 형태로 변형될 수 있는 것으로, 본 발명의 범위가 이하 설명하는 실시형태로 한정되는 것은 아니다. 본 발명의 실시형태는 당 업계에서 평균적인 지식을 가진 자에게 본 발명을 보다 완전하게 설명하기 위해서 제공되는 것이다. 따라서, 도면에서의 요소들의 형상 및 크기 등은 보다 명확한 설명을 위해 과장될 수 있으며, 도면 상의 동일한 부호로 표시되는 요소는 동일한 요소이다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention described herein may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements.

본 발명의 삽입재는 금속판재와 마찰저항층으로 구성된다. 도 3(a)는 그러한 삽입재의 일례가 제시되어 있다. The insert of the present invention is composed of a metal sheet and a frictional resistance layer. 3A shows an example of such an insert.

금속판재(11)는 인장시험기의 그립의 압하력에 의해 변형가능한 것이면 사용 가능하다. 즉, 인장시험기의 그립과 PC강연선 시편의 물림부에 본 발명의 삽입재를 설치하고, 그립에 하중을 가하면 금속판재(11)가 변형이 되면서 삽입재가 PC강선의 꼬임으로 생긴 공간에 채워지면서 접촉면적을 증가된다. 그러한 예가 도 4에 제시 되어 있다. 이와 같이, PC강연선과 삽입재의 접촉면적이 증가하게 되면서 PC강연선의 풀림을 방지하고 동시에 마찰력을 증가시킬 수 있다. The metal plate 11 can be used as long as it can be deformed by the pressing force of the grip of the tensile tester. That is, the insert of the present invention is installed in the grip of the tensile tester and the PC strand wire specimen, and when a load is applied to the grip, the metal sheet 11 is deformed and the insert is filled in the space created by the twist of the PC steel wire. Will increase the area. Such an example is shown in FIG. 4. As such, as the contact area between the PC strand and the insert increases, it is possible to prevent loosening of the PC strand and to increase friction.

본 발명의 일실시예에 따르면, 인장시험기의 그립의 압하력에 변형 가능한 금속판재는 Al, Al합금, Cu, Cu합금등이 있다. 본 발명이 이러한 금속판재에 한정되는 것은 아니다.According to one embodiment of the present invention, the metal plate material that can be deformed to the pressing force of the grip of the tensile tester includes Al, Al alloy, Cu, Cu alloy and the like. The present invention is not limited to this metal plate material.

본 발명에 따라 금속판재(11)의 일면에는 마찰저항층(12)이 형성된다. 마찰저항층은 PC강연선의 물림부와 금속판재사이에 마찰력을 증대하기 위한 것이다. 그러한 예로는 다양한 응용이 가능하며, 일례로 금속판재에 일면에 마찰입자를 형성하는 것이다. 마찰입자는 통상의 마찰입자들은 적용 가능하며 가능한 고경도로서 강도가 높은 마찰입자가 좋다. 그러한 예가 금강사이다. 금강사의 경우에는 PC강연선의 물림부에 박혀서 앵커역할을 하게 되어 미끄럼을 방지하게 된다. 이와 같이 마찰입자가 PC강연선에 박히기 위해서는 마찰입자는 예각 형상으로 된 것을 사용하는 것이 바람직하다. According to the present invention, a frictional resistance layer 12 is formed on one surface of the metal plate 11. The frictional resistance layer is to increase the friction between the bite portion of the PC strand and the metal plate. For example, various applications are possible, and for example, friction particles are formed on one surface of a metal sheet. The friction particles are applicable to conventional friction particles and preferably have high strength friction particles as high hardness as possible. An example is Geumgangsa Temple. In the case of Geumgangsa, it is embedded in the bite of the PC strand and serves as an anchor to prevent slipping. Thus, in order for the friction particles to be embedded in the PC strand, the friction particles are preferably used in an acute shape.

본 발명의 일실시예에 따라, 마찰입자를 금속판재에 형성하는 방법은 도 3(b)에 나타난 바와 같이, 금속판재의 표면에 고분자수지 필름(12a)을 형성하고 이 필름위에 마찰입자와 결합제를 도포(12b)하는 것이다. 마찰입자와 결합제는 겔상태로 만들어 부착할 수 있다. According to one embodiment of the present invention, the method of forming the friction particles on the metal plate, as shown in Figure 3 (b), to form a polymer resin film 12a on the surface of the metal plate and the friction particles and binder on the film 12b is applied. The friction particles and the binder can be attached in a gel state.

본 발명에 따라, 삽입재는 환형 또는 절곡된 형상을 가질 수 있으나, 그 형상에 제한을 두지 않는다. According to the present invention, the insert may have an annular or bent shape, but is not limited in shape.

이와 같이, 본 발명에 따르면, PC 강연선의 인장시험시 발생하는 물림부 파단 현상을 효과적으로 방지함으로써 PC 강연선의 인장시험에 소요되는 실험시간과 비용을 절감 할 수 있을 뿐만 아니라 측정되는 데이터의 신뢰도도 증가시킬 수 있다.As described above, according to the present invention, by effectively preventing the rupture of the bleeding portion occurring during the tensile test of the PC strand can not only reduce the experiment time and cost required for the tensile test of the PC strand, but also increase the reliability of the measured data. You can.

Claims (4)

PC강연선 시편의 물림부와 인장시험기의 그립의 사이에 설치되는 PC강선의 보호용 삽입재에 있어서, In the protective insert of the PC steel wire provided between the bite portion of the PC steel wire specimen and the grip of the tensile tester, 상기 인장시험기 그립의 압하력에 의해 변형 가능한 금속판재와 A metal plate deformable by the pressing force of the tension tester grip; 이 금속판재의 일면에 형성되어 상기 PC강연선과의 마찰력을 부여해주는 마찰저항층을 구비하는 PC강연선의 인장시험용 삽입재.An insert for tensile testing of a PC strand, which is formed on one surface of the metal sheet and has a frictional resistance layer to impart a friction force with the PC strand. 제 1항에 있어서,The method of claim 1, 상기 금속판재는 Al, Al합금, Cu, Cu합금의 그룹에서 선택되는 것을 특징으로 하는 PC강연선의 인장시험용 삽입재.Wherein the metal sheet material is selected from the group of Al, Al alloys, Cu, Cu alloys tensile test inserts for PC strands. 제 1항에 있어서, The method of claim 1, 상기 마찰저항층은 고분자수지 필름에 마찰입자가 결합제에 의해 부착되는 것을특징으로 하는 PC강연선의 인장시험용 삽입재.The frictional resistance layer is a tensile test insert for PC strands, characterized in that the friction particles are attached to the polymer resin film by a binder. 제 3항에 있어서, The method of claim 3, wherein 상기 마찰입자는 금강사임을 특징으로 하는 PC강연선의 인장시험용 삽입재.Insertion material for tensile testing of PC strands characterized in that the friction particles are gold steel yarn.
KR1020060131264A 2006-12-20 2006-12-20 Spacer for tensile test of steel strand for prestressed concrete KR20080057675A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020060131264A KR20080057675A (en) 2006-12-20 2006-12-20 Spacer for tensile test of steel strand for prestressed concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020060131264A KR20080057675A (en) 2006-12-20 2006-12-20 Spacer for tensile test of steel strand for prestressed concrete

Publications (1)

Publication Number Publication Date
KR20080057675A true KR20080057675A (en) 2008-06-25

Family

ID=39803423

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020060131264A KR20080057675A (en) 2006-12-20 2006-12-20 Spacer for tensile test of steel strand for prestressed concrete

Country Status (1)

Country Link
KR (1) KR20080057675A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104390906A (en) * 2014-11-24 2015-03-04 中国水利水电科学研究院 Sealing device for corrosion test on steel strand
CN110455618A (en) * 2019-08-15 2019-11-15 浙江森旺金属制品有限公司 Steel wire pulling force grip of testing machine
CN111175124A (en) * 2020-02-25 2020-05-19 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Sheath and protection method for overhead conductor metal single wire during tensile property test

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104390906A (en) * 2014-11-24 2015-03-04 中国水利水电科学研究院 Sealing device for corrosion test on steel strand
CN110455618A (en) * 2019-08-15 2019-11-15 浙江森旺金属制品有限公司 Steel wire pulling force grip of testing machine
CN111175124A (en) * 2020-02-25 2020-05-19 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 Sheath and protection method for overhead conductor metal single wire during tensile property test

Similar Documents

Publication Publication Date Title
CA2762051C (en) High elongation fibre with good anchorage
CN102056830B (en) rope end fixing device
JP5604760B2 (en) Tension member
JP2007333795A (en) Coated optical fiber and its manufacturing method
KR20080057675A (en) Spacer for tensile test of steel strand for prestressed concrete
CN204252026U (en) A kind of fiber grating post-tensioned prestressing intelligence ruggedized construction
WO2006018656A1 (en) Improved anchorage head assembly
Raoof et al. Determination of wire recovery length in steel cables and its practical applications
KR20210073881A (en) Prestressing force monitoring system of prestressins strand using smart anchoring plate based on distributed optical fiber sensor, and method for the same
CN104198366B (en) A kind of post-tensioned concrete structure steel strand wires corrosion monitoring method
KR102272116B1 (en) Smart concrete COMPOSITION AND SMART CONCRETE anchorage SYSTEM for monitoring pre-stressing loss
US4684293A (en) Cable for fastening structures and method of detecting damage to corrosion-preventive layer thereof
BE1004615A3 (en) Clamp pull tests.
JP6773810B2 (en) Steel cable
Yoo et al. Mechanism of bonding between Zn–Al-coated wires and Zn–Cu alloy casting medium in hot casting socket terminations for large bridge cables
Zhang et al. Determination of interfacial bonding strength using a cantilever bending method with in situ monitoring acoustic emission
Williams et al. Small-scale testing of damaged synthetic fiber mooring ropes
Tijani et al. Experimental life prediction of a 1+ 6 strand extracted from a 19x7 wire rope
CN87105250A (en) The improvement of anchoring devices for tensile braces
Evans et al. Wire failures in ropes and their influence on local wire strain behaviour in tension-tension fatigue
KR100742532B1 (en) The prestressing anchor by steel circular tube protecting the fiber tendon
Sloan et al. Design modifications to increase fatigue life of fiber ropes
JP2000345656A (en) Crimp grip for pc steel product
JPH11248558A (en) Measuring method for strain distribution
CN111465571B (en) Elevator suspension tool and method and apparatus for inspection thereof

Legal Events

Date Code Title Description
A201 Request for examination
E601 Decision to refuse application