JPH05172127A - High tension bolt - Google Patents

High tension bolt

Info

Publication number
JPH05172127A
JPH05172127A JP34455791A JP34455791A JPH05172127A JP H05172127 A JPH05172127 A JP H05172127A JP 34455791 A JP34455791 A JP 34455791A JP 34455791 A JP34455791 A JP 34455791A JP H05172127 A JPH05172127 A JP H05172127A
Authority
JP
Japan
Prior art keywords
bolt
optical fiber
high tension
broken
strength
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.)
Pending
Application number
JP34455791A
Other languages
Japanese (ja)
Inventor
Takao Yamada
隆夫 山田
Haruhito Okamoto
晴仁 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP34455791A priority Critical patent/JPH05172127A/en
Publication of JPH05172127A publication Critical patent/JPH05172127A/en
Pending legal-status Critical Current

Links

Landscapes

  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

PURPOSE:To prevent fragments which have been broken from a high tension bolt made of a high strength steel material, due to delayed fracture and to facilitate the finding of breakage of a bolt, by laying a material which is hard to cause the delayed fracture in comparison with the high tension bolt, and which has a large degree of elongation. CONSTITUTION:A head 1, a shank 2 and a thread part 3 are made of a high strength steel, an optical fiber cable 4 is embedded in the center axial part of the bolt throughout the overall length of the bolt, and a luminescent material 5 is provided at one end of the cable 4. The cable 4 has a ductile cover layer 8 which protects an optical fiber core wire or the assembly 7 thereof, and which has a degree of elongation that is larger than a high tension steel material from which the major part of the high tension bolt is formed. Meanwhile, the degree of elongation of the optical fiber core wire 7 is smaller than that of the high tension steel material. With this arrangement, and accordingly, when the high tension bolt is broken, the optical fiber core wire 7 is broken but the ductile cover layer 8 elongates without being broken so as to hold bolt fragments, and accordingly, it is possible to prevent the bolt fragments from dropping.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、主に建築土木構造物に
使用される高強度ボルトに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength bolt mainly used for building civil engineering structures.

【0002】[0002]

【従来の技術】F11T(引張強度110kg/m
2 )以上の強度を有する高力ボルトは、時間の経緯に
つれて破壊する、いわゆる“遅れ破壊現象”が見られる
ため、その使用場所が制限されている。遅れ破壊の確率
は使用環境に依存するが、建築土木構造物の場合には概
ね1%以下であり、耐力的には設計上の安全率で十分カ
バーすることができる。
2. Description of the Related Art F11T (tensile strength 110 kg / m
The high-strength bolt having a strength of m 2 ) or more has a so-called “delayed fracture phenomenon” in which it breaks with the passage of time, so its use place is limited. The probability of delayed fracture depends on the environment in which it is used, but in the case of building civil engineering structures, it is generally less than 1%, and in terms of yield strength, it can be sufficiently covered by the design safety factor.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、高力ボ
ルトの遅れ破壊によって生じるボルト破片の落下や、ボ
ルト交換のための破断検知に関しては、従来、効果的な
対策が講じられていなかった。
However, effective measures have not been taken so far for the detection of drop of bolt fragments caused by delayed fracture of high-strength bolts and the detection of breakage for bolt replacement.

【0004】本発明はこの課題を解決するために成され
たもので、遅れ破壊によるボルト破片の落下防止、及び
ボルトの破断を容易に発見できる高力ボルトを提供する
ことを目的とする。
The present invention was made to solve this problem, and an object of the present invention is to provide a high-strength bolt capable of preventing falling of bolt fragments due to delayed fracture and easily detecting fracture of the bolt.

【0005】[0005]

【課題を解決するための手段】第1の発明は、高強度鋼
材からなるボルトの内部軸方向に、該高強度鋼材より遅
れ破壊が生じにくく伸び能力の大きい素材を配設したも
のである。
According to a first aspect of the present invention, a bolt made of a high-strength steel material is provided with a material having a large elongation ability in the axial direction, which is less likely to cause delayed fracture than the high-strength steel material.

【0006】第2の発明は、高強度鋼材からなるボルト
の内部軸方向に、光ファイバーケーブルを配設したもの
である。
A second aspect of the invention is to arrange an optical fiber cable in the inner axial direction of a bolt made of high strength steel.

【0007】[0007]

【作用】第1の発明においては、高強度鋼材がボルトと
しての強度を負担し、内部に配設した素材が遅れ破壊に
よるボルトの落下を防止する。また、高強度鋼材が破断
すれば、内部に配設した素材は、単に挿入しただけの場
合、ボルトの両端部より奥側へ窪んで見える。
In the first aspect of the invention, the high-strength steel material bears the strength of the bolt, and the material disposed inside prevents the bolt from falling due to delayed fracture. Further, when the high-strength steel material is broken, the material provided inside appears to be recessed inward from both ends of the bolt when simply inserted.

【0008】第2の発明においては、高強度鋼材がボル
トとしての強度を負担し、内部に配設した光ファイバー
ケーブルの被覆層が遅れ破壊によるボルトの落下を防止
する。また、高強度鋼材が破断すれば、光ファイバーケ
ーブルの光ファイバーも途中で破断して光の通過が遮断
されるので、ボルトの一端から光ファイバーケーブルに
光を当てると、光ファイバーの他端面が暗色を示す。
In the second aspect of the invention, the high-strength steel material bears the strength of the bolt, and the coating layer of the optical fiber cable disposed inside prevents the bolt from falling due to delayed fracture. Further, if the high-strength steel material is broken, the optical fiber of the optical fiber cable is also broken in the middle to block the passage of light, so when the light is applied to the optical fiber cable from one end of the bolt, the other end surface of the optical fiber shows a dark color.

【0009】[0009]

【実施例】図1は本発明の実施例を示す高力ボルトの軸
方向断面図、図2はそのA−A断面図である。このボル
トは、頭部1、シャンク2及びねじ部3を高強度鋼材
(例えばF11T以上のもの)で構成し、ボルト軸芯部
にボルトの両端に至る光ファイバーケーブル4を配設し
た複合材ボルトである。なお、5は光ファイバーケーブ
ル4の一端に設けた発光体である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an axial sectional view of a high strength bolt showing an embodiment of the present invention, and FIG. 2 is an AA sectional view thereof. This bolt is a composite material bolt in which the head portion 1, the shank 2, and the screw portion 3 are made of high-strength steel material (for example, F11T or more), and the optical fiber cables 4 extending to both ends of the bolt are arranged in the bolt shaft core portion. is there. Reference numeral 5 is a light emitting body provided at one end of the optical fiber cable 4.

【0010】図5は、光ファイバーケーブル4の略断面
図である。7は光ファイバー心線又はその集合体、8は
光ファイバー心線7を保護する延性被覆層であって、そ
の伸び能力は、ボルトの主要部を構成する高強度鋼材よ
り大きいものである。一方、光ファイバーの主材料であ
る石英は、その融点が1900℃で鋼より高く、単位面
積当たりの強度も高いが、その伸び能力は鋼より小さ
い。従って、高強度鋼材ボルトが破断した場合には、ボ
ルトの軸芯部に配設された光ファイバーケーブル4の光
ファイバーも破断する。しかしながら、周囲の延性被覆
層は破断せずに伸び、ボルト破片を保持して落下を防止
する。
FIG. 5 is a schematic sectional view of the optical fiber cable 4. Reference numeral 7 is an optical fiber core wire or an assembly thereof, and 8 is a ductile coating layer that protects the optical fiber core wire 7, and its elongation ability is larger than that of the high-strength steel material forming the main part of the bolt. On the other hand, quartz, which is the main material of the optical fiber, has a melting point higher than that of steel at 1900 ° C. and higher strength per unit area, but its elongation ability is smaller than that of steel. Therefore, when the high-strength steel material bolt is broken, the optical fiber of the optical fiber cable 4 arranged at the shaft core of the bolt is also broken. However, the surrounding ductile coating layer stretches without breaking and holds the bolt debris and prevents it from falling.

【0011】また、ボルトが破断している場合、光ファ
イバーも破断していることから、発光体5の光が光ファ
イバーケーブル4の他端に伝わらなくなり、これによっ
てボルトの破断を検知することが可能になる。
Further, when the bolt is broken, the optical fiber is also broken, so that the light of the light emitting body 5 is not transmitted to the other end of the optical fiber cable 4, which makes it possible to detect the break of the bolt. Become.

【0012】図3は本発明の他の実施例を示す高力ボル
トの軸方向断面図、図4はそのB−B断面図である。こ
のボルトは、下端部6にトルクを与えて締付けるもの
で、締付時に下端部6が切断されるタイプのボルトであ
る。この場合、図4から明らかなように、光ファイバー
ケーブル4は軸芯部より少しはずれた位置に配設して、
下端部6が切断された後、光ファイバーケーブル4を端
部から見易くなるようにしている。このように、光ファ
イバーケーブル4を配設する位置は、必ずしももボルト
の軸芯とは限られず、また、光ファイバーケーブル4が
複数本となってもよい。
FIG. 3 is an axial sectional view of a high-strength bolt showing another embodiment of the present invention, and FIG. 4 is a BB sectional view thereof. This bolt is a type of bolt that is tightened by applying torque to the lower end portion 6, and the lower end portion 6 is cut when tightened. In this case, as is apparent from FIG. 4, the optical fiber cable 4 is arranged at a position slightly deviated from the shaft core,
After the lower end portion 6 is cut, the optical fiber cable 4 is made visible from the end portion. As described above, the position where the optical fiber cable 4 is arranged is not necessarily limited to the axial center of the bolt, and a plurality of optical fiber cables 4 may be provided.

【0013】なお、本実施例では、ボルト内部に光ファ
イバーケーブルを配設したが、光ファイバーケーブルに
代えて、ライドガイド(ライトパイプ)や、周囲の高強
度鋼材より遅れ破壊が起こりにくくて伸び能力のある素
材、例えば相対的に強度の低い鋼、アルミ、銅などを、
ボルト破片の落下を防止できる程度の線径にして配設し
てもよい。また、これらの光ファイバーケーブルなど
は、既に完成しているボルトに孔を開けて挿入接着して
も、ボルトの製造時に予め孔を開けておき、その孔に挿
入接着するようにしてもよい。さらに、鋼、アルミ、銅
などは押出しあるいは引抜きなどによっても、ボルト内
部に配設することができる。
In this embodiment, the optical fiber cable is arranged inside the bolt, but instead of the optical fiber cable, delayed fracture is less likely to occur than the light guide (light pipe) and surrounding high-strength steel material, and the elongation ability is high. Some materials, such as relatively low strength steel, aluminum, copper,
The wire diameter may be set so that the broken pieces of the bolt can be prevented from falling. Further, these optical fiber cables and the like may be formed by forming holes in the already completed bolts and then inserting and adhering them, or by making holes in advance at the time of manufacturing the bolts and inserting and adhering into the holes. Further, steel, aluminum, copper or the like can be arranged inside the bolt by extrusion or drawing.

【0014】[0014]

【発明の効果】第1の発明の高力ボルトよれば、高強度
鋼材がボルトとしての強度を負担し、内部に配設した素
材が遅れ破壊によるボルトの落下を防止する。また、高
強度鋼材が破断すれば、内部に配設した素材は、単に挿
入しただけの場合、ボルトの両端部より奥側へ窪んで見
えるので、容易にボルトの破断も検知できる。
According to the high-strength bolt of the first invention, the high-strength steel material bears the strength of the bolt, and the material disposed inside prevents the bolt from falling due to delayed fracture. Further, when the high-strength steel material is broken, the material disposed inside appears to be recessed inward from both ends of the bolt when it is simply inserted, so that breakage of the bolt can be easily detected.

【0015】第2の発明の高力ボルトよれば、高強度鋼
材がボルトとしての強度を負担し、内部に配設した光フ
ァイバーケーブルの被覆層が遅れ破壊によるボルトの落
下を防止する。また、高強度鋼材が破断すれば、光ファ
イバーケーブルの光ファイバーも途中で破断して光の通
過が遮断されるので、ボルトの一端から光ファイバーケ
ーブルに光を当てても、光ファイバーの他端面が暗色を
示し、容易にボルトの破断も検知できる。
According to the high-strength bolt of the second invention, the high-strength steel material bears the strength of the bolt, and the coating layer of the optical fiber cable disposed inside prevents the bolt from dropping due to delayed fracture. Also, if the high-strength steel material breaks, the optical fiber of the optical fiber cable will also break in the middle, blocking the passage of light, so even if light is applied to the optical fiber cable from one end of the bolt, the other end surface of the optical fiber will show a dark color. Also, the breakage of the bolt can be easily detected.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例を示す高力ボルトの軸方向断面
図である。
FIG. 1 is an axial sectional view of a high-strength bolt showing an embodiment of the present invention.

【図2】図1のA−A断面図である。FIG. 2 is a sectional view taken along line AA of FIG.

【図3】本発明の他の実施例を示す高力ボルトの軸方向
断面図である。
FIG. 3 is an axial sectional view of a high strength bolt showing another embodiment of the present invention.

【図4】図3のB−B断面図である。4 is a sectional view taken along line BB of FIG.

【図5】光ファイバーケーブルの略断面図である。FIG. 5 is a schematic cross-sectional view of an optical fiber cable.

【符号の説明】[Explanation of symbols]

1 頭部 2 シャンク 3 ねじ部 4 光ファイバーケーブル 5 発光体 1 Head 2 Shank 3 Screw 4 Optical fiber cable 5 Light emitter

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 高強度鋼材からなるボルトの内部軸方向
に、該高強度鋼材より遅れ破壊が生じにくく伸び能力の
大きい素材を配設してなることを特徴とする高力ボル
ト。
1. A high-strength bolt comprising a bolt made of high-strength steel, and a material having a greater elongation ability than the high-strength steel, which is less likely to cause delayed fracture than the high-strength steel.
【請求項2】 高強度鋼材からなるボルトの内部軸方向
に、光ファイバーケーブルを配設してなることを特徴と
する高力ボルト。
2. A high-strength bolt characterized in that an optical fiber cable is arranged in the inner axial direction of the bolt made of high-strength steel.
JP34455791A 1991-12-26 1991-12-26 High tension bolt Pending JPH05172127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34455791A JPH05172127A (en) 1991-12-26 1991-12-26 High tension bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34455791A JPH05172127A (en) 1991-12-26 1991-12-26 High tension bolt

Publications (1)

Publication Number Publication Date
JPH05172127A true JPH05172127A (en) 1993-07-09

Family

ID=18370202

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34455791A Pending JPH05172127A (en) 1991-12-26 1991-12-26 High tension bolt

Country Status (1)

Country Link
JP (1) JPH05172127A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2362936B (en) * 2001-07-10 2002-09-04 Barry Littlewood Mechanical fastening device
CN103133479A (en) * 2011-11-30 2013-06-05 苏州工业园区协诚精密五金有限公司 Preparation method for screw with light storing and emitting properties
CN104235150A (en) * 2013-06-19 2014-12-24 杨春足 Sensing screw device and system capable of synchronously pre-tensioning fiber bragg grating and bolt
CN113685411A (en) * 2021-09-02 2021-11-23 浙江盛世瑞金紧固件股份有限公司 Anti-fracture bolt for automobile tire

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2362936B (en) * 2001-07-10 2002-09-04 Barry Littlewood Mechanical fastening device
CN103133479A (en) * 2011-11-30 2013-06-05 苏州工业园区协诚精密五金有限公司 Preparation method for screw with light storing and emitting properties
CN104235150A (en) * 2013-06-19 2014-12-24 杨春足 Sensing screw device and system capable of synchronously pre-tensioning fiber bragg grating and bolt
TWI510720B (en) * 2013-06-19 2015-12-01 Jinn Her Entpr Co Ltd The synchronous pre-tensionable sensing screw with fiber bragg grating devices
CN113685411A (en) * 2021-09-02 2021-11-23 浙江盛世瑞金紧固件股份有限公司 Anti-fracture bolt for automobile tire

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