JPH05156708A - Cracking prevention method of girder in angular frame construction - Google Patents
Cracking prevention method of girder in angular frame constructionInfo
- Publication number
- JPH05156708A JPH05156708A JP35735591A JP35735591A JPH05156708A JP H05156708 A JPH05156708 A JP H05156708A JP 35735591 A JP35735591 A JP 35735591A JP 35735591 A JP35735591 A JP 35735591A JP H05156708 A JPH05156708 A JP H05156708A
- Authority
- JP
- Japan
- Prior art keywords
- girder
- frame construction
- angular
- steel materials
- mountain
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Rod-Shaped Construction Members (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、山形ラーメン構造物に
おける大梁の亀裂防止方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing a large beam from cracking in a mountain-shaped rigid frame structure.
【0002】[0002]
【発明の目的】場所打ちコンクリート造の山形ラーメン
構造物では、スパンが大きい場合に、大梁と柱にポスト
テンショニング方式でプレストレスを導入することが行
われている。SUMMARY OF THE INVENTION In a cast-in-place concrete mountain-shaped rigid frame structure, prestressing is applied to the girders and columns by a post tensioning method when the span is large.
【0003】そして、大梁におけるPC鋼材の配置に
は、図2の(A)に示すように大梁1の端部から山形頂
部まで延びるPC鋼材2,3を配置する方式と、図2の
(B)に示すように大梁1の一端部から他端部まで通し
てPC鋼材4を配置する方式とがあるが、これら何れの
方式においても、プレストレス導入後に、大梁1の山形
頂部に横方向の亀裂が入る場合が多く、従来から問題に
なっていた。The arrangement of the PC steel materials in the girder is a method of arranging the PC steel materials 2 and 3 extending from the end portion of the girder 1 to the top of the chevron as shown in FIG. There is a method of arranging the PC steel material 4 from one end to the other end of the girder 1 as shown in FIG. 4). It often causes cracks, which has been a problem in the past.
【0004】本発明の目的は、前記亀裂の発生を防止す
る手段を提供することにある。An object of the present invention is to provide means for preventing the occurrence of cracks.
【0005】[0005]
【発明の構成】本発明の構成上の特徴は、山形ラーメン
構造物における長さ方向にPC鋼材を配置した大梁の山
形頂部に、縦方向のPC鋼材を配置し、このPC鋼材で
大梁の山形頂部に縦方向のプレストレスを導入すること
により、大梁に長さ方向のプレストレスを導入したとき
に山形頂部に発生する亀裂を防止する点にある。The structure of the present invention is characterized in that a vertical PC steel material is arranged at the top of a mountain girder of a large beam in which a PC steel material is arranged in the longitudinal direction in a mountain-shaped ramen structure. By introducing the pre-stress in the vertical direction at the top, it is possible to prevent cracks occurring at the top of the chevron when the pre-stress in the longitudinal direction is introduced at the girder.
【0006】[0006]
【実施例の説明】図1は、図2の(A)に示す方式で長
さ方向にプレストレスを導入するPC鋼材2,3が配置
されている大梁1の山形頂部を示しており、図中、5は
棟梁、6は小梁である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a chevron top of a girder 1 on which PC steel materials 2 and 3 for introducing prestress in the lengthwise direction are arranged by the method shown in FIG. Inside, 5 is a master beam and 6 is a small beam.
【0007】前述の亀裂は、PC鋼材2,3により大梁
1に長さ方向のプレストレスを導入したときに、棟梁5
の下方に発生するが、この亀裂の発生を防止するため
に、この実施例では、大梁1の山形頂部の、棟梁5の左
右対称位置にそれぞれ2本の縦方向のPC鋼材7を配置
し、その緊張・定着により、大梁1の山形頂部に縦方向
のプレストレスを導入するようにしている。The above-mentioned cracks occur when the prestress in the lengthwise direction is introduced into the girder 1 by the PC steel materials 2 and 3, and thus the ridge beam 5
In order to prevent the occurrence of this crack, in this example, two vertical PC steel materials 7 are arranged at the bilaterally symmetrical positions of the master beam 5 at the mountain top of the girder 1, Due to the tension and fixation, vertical prestress is introduced to the mountain top of the girder 1.
【0008】[0008]
【発明の効果】本発明によれば、山形ラーメン構造物に
おける大梁に長さ方向のプレストレスを導入したときに
大梁の山形頂部に発生する亀裂を、簡単かつ有効に防止
することができるので、長スパンの山形ラーメン構造物
の構築に寄与するところ大である。According to the present invention, it is possible to easily and effectively prevent the cracks generated at the mountain tops of the girders when the longitudinal prestress is introduced into the girders in the mountain-shaped rigid frame structure. It greatly contributes to the construction of long-span Yamagata ramen structures.
【図1】本発明の一実施例の説明図である。FIG. 1 is an explanatory diagram of an embodiment of the present invention.
【図2】山形ラーメン構造物における大梁に長さ方向の
プレストレスを導入するPC鋼材の配置態様図である。FIG. 2 is an arrangement diagram of a PC steel material for introducing a prestress in a longitudinal direction into a girder in a mountain-shaped rigid frame structure.
1:大梁、2,3,4:PC鋼材、5:棟梁、6:小
梁、7:PC鋼材。1: Large beam, 2, 3, 4: PC steel material, 5: Master beam, 6: Small beam, 7: PC steel material.
Claims (1)
PC鋼材を配置した大梁の山形頂部に、縦方向のPC鋼
材を配置し、このPC鋼材で大梁の山形頂部に縦方向の
プレストレスを導入することにより、大梁に長さ方向の
プレストレスを導入したときに山形頂部に発生する亀裂
を防止することを特徴とする山形ラーメン構造物におけ
る大梁の亀裂防止方法。1. A vertical PC steel material is arranged at the mountain top of a large beam in which a PC steel material is arranged in the longitudinal direction in a mountain-shaped rigid frame structure, and vertical prestress is introduced at the mountain top of the large beam by this PC steel material. A crack prevention method for a girder in a mountain-shaped ramen structure, characterized by preventing cracks that occur at the apex of the chevron when a prestress in the longitudinal direction is introduced into the girder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35735591A JP2743130B2 (en) | 1991-12-02 | 1991-12-02 | Prevention method of girder crack in Yamagata ramen structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP35735591A JP2743130B2 (en) | 1991-12-02 | 1991-12-02 | Prevention method of girder crack in Yamagata ramen structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05156708A true JPH05156708A (en) | 1993-06-22 |
JP2743130B2 JP2743130B2 (en) | 1998-04-22 |
Family
ID=18453709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP35735591A Expired - Lifetime JP2743130B2 (en) | 1991-12-02 | 1991-12-02 | Prevention method of girder crack in Yamagata ramen structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2743130B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101110744B1 (en) * | 2009-10-01 | 2012-02-24 | 쌍용건설 주식회사 | Vertical Post Tension Structure Of Sloping Structure And Its Construction Method |
-
1991
- 1991-12-02 JP JP35735591A patent/JP2743130B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101110744B1 (en) * | 2009-10-01 | 2012-02-24 | 쌍용건설 주식회사 | Vertical Post Tension Structure Of Sloping Structure And Its Construction Method |
Also Published As
Publication number | Publication date |
---|---|
JP2743130B2 (en) | 1998-04-22 |
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