KR20030006449A - Rectangular Shear Cotter for Precast Slabs - Google Patents

Rectangular Shear Cotter for Precast Slabs Download PDF

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Publication number
KR20030006449A
KR20030006449A KR1020010042187A KR20010042187A KR20030006449A KR 20030006449 A KR20030006449 A KR 20030006449A KR 1020010042187 A KR1020010042187 A KR 1020010042187A KR 20010042187 A KR20010042187 A KR 20010042187A KR 20030006449 A KR20030006449 A KR 20030006449A
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South Korea
Prior art keywords
shear key
rectangular
hollow slab
shear
circular
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KR1020010042187A
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Korean (ko)
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유승룡
조영모
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유승룡
강남건영주식회사
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Priority to KR1020010042187A priority Critical patent/KR20030006449A/en
Publication of KR20030006449A publication Critical patent/KR20030006449A/en

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/43Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

PURPOSE: A rectangular shear cotter is provided to improve economical efficiency and productivity when manufacturing a roller and to promote bending and shearing stress of a hollow core slab. CONSTITUTION: The rectangular shear cotter(4) is produced by making a roller having a rectangular shear cotter pass through the upper part of a hollow core slab(2) which is manufactured by making a hollow core slab manufacturing frame pass through a bed. Wherein the roller having a rectangular shear cotter is installed to the backside of a hollow core slab manufacturing frame.

Description

직사각형 모양의 수평 전단키{Rectangular Shear Cotter for Precast Slabs}Rectangular Shear Cotter for Precast Slabs}

본 발명의 직사각형 모양의 수평 전단키는 폭 1200mm의 중공슬래브 상부에 90mm×26mm의 직사각형 모양의 수평전단키(Shear cotter)를 일정한 간격으로 여러개 찍어넣어 생산한 뒤 현장에서 PC제품과 토핑콘크리트가 타설될 때 접합면의 수평전단력을 증가시키기 위해 고려된 전단키에 관한 것이다.The horizontal shear key of the present invention is produced by placing a plurality of 90mm × 26mm rectangular shear shears (Shear cotter) at regular intervals on the hollow slab having a width of 1200mm and then placing PC products and topping concrete in the field. A shear key considered to increase the horizontal shear force of the joint.

기존의 원형 전단키는 지름 25mm의 크기를 가지며 동일한 폭의 중공슬래브 상부에 적용된다. 원형 전단키는 간격이 조밀하지만 원형이기 때문에 직사각형 보다 수평 전단력에 저항하는 성능이 떨어진다.The existing circular shear key has a diameter of 25mm and is applied to the upper part of the hollow slab of the same width. Circular shear keys are tightly spaced but circular, and therefore less resistant to horizontal shear forces than rectangular ones.

본 발명의 직사각형 모양의 수평 전단키는 수평 전단력에 저항하는 성능을 증가시키며, 롤러 제작시 경제성과 제작성을 향상시켰으며 시공시에도 더 정확한 전단키의 형성를 고려하였다.The horizontal shear key of the present invention increases the resistance to the horizontal shear force, improved the economics and manufacturability when manufacturing the roller, and considered the formation of a more accurate shear key during construction.

PC부위와 토핑콘크리트의 완전한 합성의 확보는 부재의 일체거동을 위하여 필수적인 요소가 된다. 일반적으로 국내에서는 원형 수평전단키(Shear cotter)를 사용하고 있으나, 보의 휨파괴시 수평전전단력에 대한 충분한 내력을 보유하는지에 의문시된다. 본 연구에서 수평내력을 증진시키며, 기계적 생산과정에서 생산성을 향상시킬 수 새로운 직사각형 형태의 수평 전단키를 개발하였다.Ensuring complete synthesis of PC and topping concrete is essential for the integral behavior of the members. Generally, circular shear shear key is used in Korea, but it is questioned whether it possesses sufficient strength against horizontal shear force during bending failure of beam. In this study, a new rectangular type shear key was developed to improve horizontal strength and improve productivity during mechanical production.

기존의 원형 전단키는 지름 25mm의 크기를 가지며 동일한 폭의 중 공슬래브 상부에 적용된다. 원형 전단키는 간격이 조밀하지만 원형이기 때문에 직사각형보다 수평 전단력에 저항하는 성능이 떨어진다. 본 발명의 직사각형 모양의 수평 전단키는 수평 전단력에 저항하는 성능을 증가시키며, 롤러 제작시 생산성을 향상시켰으며, 시공시에도 더 정확한 전단키의 형성를 고려하였다. 기존의 원형 수평 전단키(1)는 먼저 중공슬래브 제작 프레임 뒤쪽에 원형 전단키를 세긴 롤러를 설치한다. 중공슬래브 제작 프레임이 베드(6)를 지나가면서 중공슬래브를 제작하면 그 뒤에 장착된 원형 전단키를 세긴 롤러가 중공슬래브 상부를 지나가며 원형 수평 전단키(1)를 생성한다. 중공슬래브의 제작이 완성되면 일정한 시간이 흐른 뒤 중공슬래브의 강선을 절단한다. 강선절단이 완료된 후 다시 일정한 시간 뒤에 수송에 편리하도록 중공슬래브를 절단하고 양생기간을 거쳐 현장으로 수송된 뒤 현장에서 토핑콘크리트(3)를 타설하여 일체화하는 단계로 이루어진다.The existing circular shear key has a diameter of 25mm and is applied to the upper part of hollow slab of the same width. Circular shear keys are tightly spaced but circular, and therefore less resistant to horizontal shear forces than rectangular ones. The horizontal shear key of the present invention increases the performance against the horizontal shear force, improves the productivity in the production of the roller, and considered the formation of a more accurate shear key during construction. The existing circular horizontal shear key (1) first install a roller counting the circular shear key in the back of the hollow slab manufacturing frame. Hollow slab fabrication As the frame passes through the bed (6) to produce a hollow slab, a roller counting the circular shear key mounted behind it passes through the hollow slab top to generate a circular horizontal shear key (1). After the hollow slab is manufactured, the steel wire of the hollow slab is cut after a certain time. After the steel wire cutting is completed, the hollow slab is cut again to be convenient for transportation after a certain time, and is transported to the site through a curing period, followed by pouring the topping concrete 3 on the site and integrating it.

프리캐스트 슬래브 요소는 부가적인 서포트가 없는 단순 지지 상태에서 자중을 지지할 수 있어야 하며, 또한 프리캐스트 콘크리트 강도보다 더 작은 강도의 토핑콘크리트는 프리캐스트 요소에 부가적인 강성, 강도, 부드러운 표면 마감을 제공하여 준다. 이러한 합성 콘크리트 단면은 적재하중에 대한 합성 거동을 고려할 수 있다면, 휨강도는 훨씬 쉽게 계산될 수 있다.The precast slab element must be able to support its own weight in a simple supporting state without additional support, and topping concrete of less strength than the precast concrete strength provides additional stiffness, strength and smooth surface finish to the precast element. Give it. If this composite concrete cross section can take into account the composite behavior of the loading, the flexural strength can be calculated much more easily.

본 발명의 직사각형 모양의 수평 전단키(4)는 생산과 구조적 효율성을 고려한 프리캐스트 중공 콘크리트 슬래브와 토핑의 일체화를 위한 기계적 수평전단키이다. 일반적으로 현장타설 토핑콘크리트에 의하여 프리캐스트 부재의 일체화를 구현하게 되는데, 이 경우, 프리캐스트 콘크리트와 토핑콘크리트는 합성작용을 위하여 수평 전단에 대한 충분한 내력이 필요하다.The horizontal shear key 4 of the rectangular shape of the present invention is a mechanical horizontal shear key for integrating a precast hollow concrete slab and topping in consideration of production and structural efficiency. In general, the precast member is integrated by the cast-in-place topping concrete. In this case, the precast concrete and the topping concrete need sufficient strength for horizontal shear for the compounding action.

수평력에 대한 충분한 내력확보는 동일 단면하에서 한층 증가된 휨과 전단내력 증진을 도모할 수 있으며, 구조계산시에도 두 단면을 하나의 합성단면으로 처리함으로써 간편한 내력예상이 가능하다.Ensuring sufficient strength against lateral force can further increase bending and shear strength under the same cross-section, and it is possible to easily predict the strength by treating two cross-sections as one composite cross section during structural calculation.

도1A는 종래의 원형 모양의 수평 전단키의 평면도이다.1A is a plan view of a conventional circular shear key.

도1B는 종래의 원형 전단키에 토핑콘크리트를 타설한 접합부의 단면도이다.Fig. 1B is a sectional view of a joint in which topping concrete is poured onto a conventional circular shear key.

도2A는 본 발명의 직사각형 모양의 수평 전단키의 평면도이다.Fig. 2A is a plan view of a rectangular shear key of the present invention.

도2B는 본 발명의 직사각형 전단키에 토핑콘크리트를 타설한 접합부의 단면도이다.Fig. 2B is a cross sectional view of a joint in which topping concrete is poured on a rectangular shear key of the present invention.

도3은 본 발명의 직사각형 전단키를 사용하여 중공슬래브 상부에 적용하는 생산도이다.Figure 3 is a production diagram applied to the hollow slab top using a rectangular shear key of the present invention.

〈도면의 부호에 대한 간단한 설명〉<Brief description of the symbols in the drawings>

1: 종래의 원형 모양의 수평 전단키1: conventional circular shaped horizontal shear key

2: 중공슬래브(Hollow Core Slab)2: Hollow Core Slab

3: 토핑콘크리트3: topping concrete

4: 본 발명의 직사각형 모양의 수평 전단키4: rectangular shearing key of the present invention

5: 본 발명의 직사각형 모양의 전단키를 세긴 롤러5: roller counting the shear key of rectangular shape of this invention

6: 중공슬래브 생산 베드6: hollow slab production bed

도면에 따라 본 발명을 설명한다.The present invention will be described with reference to the drawings.

도 1A는 종래의 원형 전단키를 적용한 중공슬래브이고 도1B은 이를 이용하여 현장에서 토핑콘크리트를 타설한 단면도이다. 기존 원형 수평 전단키(1)는 지름 25mm의 크기를 가지며 동일한 폭의 중공슬래브(2) 상부에 원형 전단키를 생성하며 일정한 양생기간을 거쳐 현장에서 토핑콘크리트(3)를 타설하여 일체화된다. 원형 전단키(1)는 간격이 조밀하지만 원형이기 때문에 직사각형 보다 수평 전단력에 저항하는 성능이 떨어진다. 현장타설 토핑콘크리트(3)에 의하여 프리캐스트 부재의 일체화를 구현하게 되는데, 이를 위하여, 프리캐스트 콘크리트와 토핑콘크리트는 수평 전단에 대한 충분한 내력이 필요하게 된다. 도 2A는 본 발명의 직사각형 모양의 수평 전단키(4)를 적용한 중공슬래브 평면도로서 일정크기의 직사각형 모양 전단키를 중공슬래브 상부에 생성하여 수평 전단력에 저항하는 성능을 증가시키며, 롤러 제작시 경제성과 생산성을 향상시켰다. 도 3A는 그 시공과정을 나타낸다.1A is a hollow slab to which a conventional circular shear key is applied, and FIG. 1B is a cross-sectional view of placing topping concrete in the field using the same. The existing circular horizontal shear key (1) has a diameter of 25mm and generates a circular shear key on the hollow slab (2) of the same width and is integrated by pouring the topping concrete (3) in the field through a certain curing period. Since the circular shear key 1 has a tight spacing but is circular, the circular shear key 1 is less resistant to horizontal shear force than a rectangular one. The cast-in-place topping concrete 3 realizes the integration of the precast member. To this end, the precast concrete and the topping concrete need sufficient strength for horizontal shear. FIG. 2A is a plan view of a hollow slab to which a rectangular horizontal shear key 4 of the present invention is applied, thereby generating a rectangular shear key having a predetermined size on the upper side of the hollow slab, to increase the performance of resisting horizontal shear force, and to improve the economics and productivity when manufacturing the roller. Improved. 3A shows the construction process.

본 발명의 직사각형 모양의 수평 전단키(4)는 원형 전단키(1)보다도 합성작용이 우수하고 그 생산성이 우수하므로 중공슬래브에서 보다 발전된 휨과 전단 내력 증진을 도모할 수 있다.Since the horizontal shear key 4 of the present invention has a better synthesizing action and better productivity than the circular shear key 1, it is possible to further develop bending and shear strength in hollow slabs.

Claims (2)

롤러(5) 표면에 직사각형 모양의 수평 전단키(4)를 적용하여, 중공슬래브(2) 상단에 일정하게 생성되는 직사각형 모양의 수평 전단키;로 구성되는 것을 특징으로 하는 프리캐스트 중공슬래브 및 PC제품Precast hollow slab and PC products, characterized in that consisting of; a horizontal shear key of a rectangular shape is uniformly generated on the top of the hollow slab (2) by applying a rectangular horizontal shear key (4) to the surface of the roller (5) 제1항을 적용한 중공슬래브 및 PC제품에 현장타설 토핑콘크리를 적용하여 일체화하는 방법(3);(3) a method of integrating a hollow slab and a PC product to which the claim 1 is applied by applying in-situ topping concrete;
KR1020010042187A 2001-07-12 2001-07-12 Rectangular Shear Cotter for Precast Slabs KR20030006449A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160068078A (en) * 2014-12-04 2016-06-15 삼성물산 주식회사 Hollow Core Slab Shear Key Cutting Apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693076A (en) * 1985-04-09 1987-09-15 Toyota Jidosha Kabushiki Kaisha Double air-fuel ratio sensor system having improved response characteristics
JPH02311639A (en) * 1989-05-26 1990-12-27 Takenaka Komuten Co Ltd Construction of composite floor
JPH11229626A (en) * 1998-02-17 1999-08-24 Ohbayashi Corp Shear cotter molding method of pc floor slab

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693076A (en) * 1985-04-09 1987-09-15 Toyota Jidosha Kabushiki Kaisha Double air-fuel ratio sensor system having improved response characteristics
JPH02311639A (en) * 1989-05-26 1990-12-27 Takenaka Komuten Co Ltd Construction of composite floor
JPH11229626A (en) * 1998-02-17 1999-08-24 Ohbayashi Corp Shear cotter molding method of pc floor slab

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160068078A (en) * 2014-12-04 2016-06-15 삼성물산 주식회사 Hollow Core Slab Shear Key Cutting Apparatus

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