JP2013181819A - Bolt-type distortion detector - Google Patents

Bolt-type distortion detector Download PDF

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JP2013181819A
JP2013181819A JP2012045605A JP2012045605A JP2013181819A JP 2013181819 A JP2013181819 A JP 2013181819A JP 2012045605 A JP2012045605 A JP 2012045605A JP 2012045605 A JP2012045605 A JP 2012045605A JP 2013181819 A JP2013181819 A JP 2013181819A
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side member
bolt
head
tip
type strain
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JP5487441B2 (en
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Nobuhiro Shimoi
信浩 下井
Tadashi Yoshioka
正 吉岡
Masahiro Saijo
雅博 西條
Osamu Ishizuka
理 石塚
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Oyo Corp
Akita Prefectural University
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Akita Prefectural University
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Abstract

PROBLEM TO BE SOLVED: To provide a bolt-type distortion detector easily attachable to an existing structure for a long time, inexpensively manufactured, and capable of easily measuring distortion of the structure without needing any sensor power source.SOLUTION: A bolt-type distortion detector includes a head side member 10 having a head, a shaft part, and a shaft hole 14 penetrating in an axial direction, and a tip side member 11 including only a shaft part and having a shaft hole 15 formed from a base end to the tip, which are spaced from each other in the axial direction. Sensor rods 12 including piezo cables 16 are inserted into the shaft holes of both the head side member and the tip side member and combined into one, and the lead part 18 of the piezo cable is pulled out from the head side to the outside.

Description

本発明は、各種の構造物で発生する歪みを測定するためのボルト形状の歪みセンサに関し、更に詳しく述べると、頭部と軸部を備えた頭部側部材と、軸部のみからなる先端側部材とが、軸方向で間隔をあけた状態で配置され、それら頭部側部材と先端側部材の頭部側端面から先端側端面に向かって形成されている軸孔にピエゾケーブルを内蔵するセンサロッドを挿通して結合し、全体がボルト形状となるように一体化された構造のボルト型歪み検出器に関するものである。このボルト型歪み検出器は、特に橋梁などの土木・建築構造物の歪み測定を長期間にわたって実施するような場合に有用である。   The present invention relates to a bolt-shaped strain sensor for measuring strain generated in various structures. More specifically, the present invention relates to a head-side member having a head and a shaft, and a tip side composed of only the shaft. Sensors in which the members are arranged in a state of being spaced apart in the axial direction, and the piezo cable is built in the shaft hole formed from the head side end surface of the head side member and the tip side member toward the tip side end surface The present invention relates to a bolt-type strain detector having a structure in which a rod is inserted and coupled so as to be integrated into a bolt shape. This bolt type strain detector is particularly useful when measuring strains of civil engineering and building structures such as bridges over a long period of time.

我が国では、高度経済成長期に建設された非常に多くの建物や橋梁・トンネルなどの各種コンクリート構造物が、今後数十年の間に耐用年数を迎えることから、それらの安全を十分に維持できるかが懸念されている。最近の調査によれば、橋の寿命の目安とされる50年に達していなくても、コンクリートの劣化や鋼材の腐食が想定外に進んでいる道路橋も数多く存在することが分かっている。また、健全な構造物であっても、地震などの災害によって大きな損傷を受けることも予想される。   In Japan, a large number of buildings and various concrete structures such as bridges and tunnels constructed during the period of high economic growth will reach the end of their useful lives in the coming decades, so their safety can be sufficiently maintained. There are concerns. According to a recent survey, it has been found that there are many road bridges where the deterioration of concrete and the corrosion of steel materials have progressed unexpectedly, even if it has not reached 50 years, which is the standard of bridge life. In addition, even a healthy structure is expected to be damaged greatly by a disaster such as an earthquake.

このようなことから、利用者の安全を確保し、構造物を効率的に管理するためには、その損傷度や健全度を正確に診断できるようにすることが肝要である。そのため、構造物に生じる歪みを定期的に測定することが行われている。   For this reason, in order to ensure the safety of the user and manage the structure efficiently, it is important to be able to accurately diagnose the degree of damage and soundness. Therefore, the distortion generated in the structure is regularly measured.

構造物に生じる歪みの測定は、一般に歪みゲージを用いることで行われてきた。歪みゲージを構造物の適宜箇所に貼り付け、該歪みゲージに電流を流して電気抵抗を測定することで、構造物の変位や変形を求めることができる。しかし、測定対象が、特に橋梁など巨大な土木構造物のような場合には、多数の歪みゲージを、強固に且つ長期間にわたって安定的に取り付けることは困難である。しかも、測定のために各歪みゲージに電流を供給する必要があり、そのためのセンサ電源を設置しなければならない。また、歪みゲージを構造物の連結箇所に取り付けるには、そのための部材を用意したり、煩瑣な取り付け作業が必要となるなどの問題がある。   The measurement of strain generated in a structure has generally been performed using a strain gauge. Displacement and deformation of the structure can be obtained by attaching a strain gauge to an appropriate portion of the structure and passing an electric current through the strain gauge to measure the electrical resistance. However, when the object to be measured is a huge civil structure such as a bridge, it is difficult to attach a large number of strain gauges firmly and stably over a long period of time. In addition, it is necessary to supply current to each strain gauge for measurement, and a sensor power source for that purpose must be installed. Moreover, in order to attach a strain gauge to the connection location of a structure, there exists a problem that the member for it is prepared or a complicated installation operation is needed.

そこで近年、構造物に光ファイバを張り巡らし、その光ファイバの一端に光歪測定器を接続することで、コンクリート構造物の変位を検出する手法が開発されている(例えば特許文献1参照)。しかし、このような光ファイバによる歪み測定の手法は、システムが高価であり、光ファイバ中に光を伝搬させるので、そのためのセンサ電源が必要となる。また歪みから損傷を検出するには固有振動数の変化などを利用するが、固有振動数変化は一般に感度が悪く、そのため光ファイバから離れた位置での損傷の検出は困難である。   Therefore, in recent years, a technique for detecting the displacement of a concrete structure by stretching an optical fiber around the structure and connecting an optical strain measuring device to one end of the optical fiber has been developed (see, for example, Patent Document 1). However, such a strain measurement method using an optical fiber is expensive in system and propagates light into the optical fiber, so that a sensor power supply is required. In order to detect damage from strain, a change in natural frequency or the like is used. However, a change in natural frequency is generally insensitive, so that it is difficult to detect damage at a position away from the optical fiber.

このように、既存の様々な構造物の有効利用を図る観点からは、補修・補強による長寿命化が大きな課題となっており、そのためには安価で、既存の構造物に対しても容易に且つ長期間にわたって安定的に取り付けることができ、構造物に生じる歪みを簡便に測定できる技術の開発が強く求められている。   In this way, from the viewpoint of effective use of various existing structures, extending the life through repair and reinforcement is a major issue, which is cheap and easy for existing structures. In addition, there is a strong demand for the development of a technique that can be stably attached over a long period of time and that can easily measure strain generated in a structure.

特開2000−65540号公報JP 2000-65540 A

本発明が解決しようとする課題は、既存の構造物に対しても容易に且つ長期間にわたって安定的に取り付けることができ、安価であり、しかもセンサ電源が不要で、構造物に生じる歪みを簡便に測定できるようにすることである。   The problem to be solved by the present invention is that it can be easily and stably attached to an existing structure over a long period of time, is inexpensive, does not require a sensor power supply, and can easily cause distortion in the structure. To be able to measure.

本発明は、頭部と軸部を備え軸方向に貫通する軸孔が形成されている頭部側部材と、軸部のみからなり基端から先端に向かう軸孔が形成されている先端側部材とが、軸方向で間隔をあけた状態で配置され、それら頭部側部材と先端側部材の軸孔にピエゾケーブルを内蔵するセンサロッドが挿通され、前記頭部側部材と前記先端側部材とが前記センサロッドの両端部で結合されて、全体がボルト形状に一体化されており、前記ピエゾケーブルのリード部を頭部側から外部へ引き出すようにしたボルト型歪み検出器である。   The present invention includes a head-side member that includes a head and a shaft, and has a shaft hole that penetrates in the axial direction. Are arranged in a state of being spaced apart in the axial direction, and a sensor rod incorporating a piezo cable is inserted into the shaft hole of the head side member and the tip side member, and the head side member and the tip side member Is a bolt type strain detector that is coupled at both ends of the sensor rod and integrated into a bolt shape as a whole, and the lead portion of the piezo cable is pulled out from the head side to the outside.

ここで前記センサロッドは、例えば中心に位置する細長状のピエゾケーブルが、柔軟性素材からなる保護チューブで取り囲まれた構造とする。あるいは更に前記保護チューブの外側が屈曲可能な素材からなる外鞘で被われた構造としてもよい。前記保護チューブは樹脂あるいはゴムなどの柔軟性素材からなり、典型的な例としてはウレタン樹脂を用いる。外鞘の材料としては、セラミックスや工業プラスチックなどを用いることができる。   Here, the sensor rod has, for example, a structure in which an elongated piezo cable located at the center is surrounded by a protective tube made of a flexible material. Or it is good also as a structure where the outer side of the said protection tube was further covered with the outer sheath which consists of a raw material which can be bent. The protective tube is made of a flexible material such as resin or rubber, and a typical example is urethane resin. As the material of the outer sheath, ceramics, industrial plastics, or the like can be used.

頭部側部材や先端側部材とセンサロッドとの結合は、接着剤による固着や機械的結合、あるいはそれらの併用など任意の方法でよい。機械的な結合の場合、例えば頭部側部材の頭部側面に径方向に軸孔に至るネジ穴を形成し、該ネジ穴に螺合する止めネジでセンサロッドを固定する構造がある。先端側部材については、その先端側に薄肉円筒部を延設し、該薄肉円筒部をカシメることでセンサロッドを固定する構造がある。   The head side member or the tip side member and the sensor rod may be joined by any method such as fixing with an adhesive, mechanical joining, or a combination thereof. In the case of mechanical coupling, for example, there is a structure in which a screw hole reaching a shaft hole in the radial direction is formed in the head side surface of the head side member, and the sensor rod is fixed with a set screw screwed into the screw hole. The distal end side member has a structure in which a thin cylindrical portion is extended on the distal end side and the sensor rod is fixed by caulking the thin cylindrical portion.

ボルト型歪み検出器は、構造物同士が結合する境界に、中間部で露出しているセンサロッドの部分が位置するように取り付ける。例えば、前記先端側部材の外周面に、固定ナット取り付け用のネジ部を形成した構造とし、緩み止めナットなどによって取り付ける方法がある。あるいは、前記先端側部材の直径方向に、ピン挿通用の貫通孔を形成した構造とし、割りピンのような保持具によって保持する方法もある。更には、前記頭部側部材の軸部外周に、先細状の圧着用テーパ部を形成した構造とし、構造物の取り付け孔に打ち込み圧接する方法もある。   The bolt-type strain detector is attached so that the portion of the sensor rod exposed at the intermediate portion is located at the boundary where the structures are coupled to each other. For example, there is a method in which a screw part for attaching a fixing nut is formed on the outer peripheral surface of the distal end side member, and the fixing member is attached by a locking nut or the like. Alternatively, there is a method in which a through hole for inserting a pin is formed in the diameter direction of the distal end side member and held by a holder such as a split pin. Further, there is a method in which a tapered crimping taper portion is formed on the outer periphery of the shaft portion of the head-side member and driven into a mounting hole of the structure for pressure contact.

本発明に係るボルト型歪み検出器は、全体がボルト形状で内部にピエゾケーブルが収容されている構造なので、既存の構造物であっても、そのボルト挿入孔を利用して容易に且つ長期間にわたって安定的に取り付けることができる。しかも、頭部側部材と先端側部材とが離間し、中間部にはセンサロッドが存在するだけの構造なので変形しやすく、構造物の撓みや捩れなどの変形を高感度で検出することができる。更に本発明では、ピエゾケーブルを用いた簡単な構造なので、安価でありセンサ電源を必要としないことから、容易に多点に設置でき、長期間にわたって安定的に測定し続けることができることと相俟って、各種土木・建築構造物のヘルスモニタリングシステムに適したものとなる。また本発明のボルト型歪み検出器は、鉄骨構造物のみならず、木造構造物などにも適用できる。   The bolt-type strain detector according to the present invention has a structure in which the whole is a bolt shape and a piezo cable is accommodated therein. Therefore, even an existing structure can be easily and for a long time using the bolt insertion hole. Can be attached stably. In addition, since the head side member and the tip side member are separated from each other and the sensor rod is only present in the middle portion, the structure is easily deformed, and deformation such as bending or twisting of the structure can be detected with high sensitivity. . Further, in the present invention, since it is a simple structure using a piezo cable, it is inexpensive and does not require a sensor power supply. Therefore, it can be easily installed at multiple points and can be stably measured over a long period of time. Therefore, it becomes suitable for the health monitoring system of various civil engineering and building structures. The bolt type strain detector of the present invention can be applied not only to a steel structure but also to a wooden structure.

本発明に係るボルト型歪み検出器の一実施例を示す説明図。Explanatory drawing which shows one Example of the bolt type distortion detector which concerns on this invention. その組立説明図。The assembly explanatory drawing. 本発明に係るボルト型歪み検出器の他の実施例を示す説明図。Explanatory drawing which shows the other Example of the bolt type distortion detector which concerns on this invention. その組立説明図。The assembly explanatory drawing. 本発明に係るボルト型歪み検出器の更に他の実施例を示す説明図。Explanatory drawing which shows the further another Example of the bolt type distortion detector which concerns on this invention. ボルト型歪み検出器の使用状態の一例を示す説明図。Explanatory drawing which shows an example of the use condition of a bolt type distortion detector. 本発明に係るボルト型歪み検出器の他の実施例を示す説明図。Explanatory drawing which shows the other Example of the bolt type distortion detector which concerns on this invention. そのボルト型歪み検出器の使用状態の例を示す説明図。Explanatory drawing which shows the example of the use condition of the bolt type distortion detector. 本発明に係るボルト型歪み検出器の他の実施例を示す説明図。Explanatory drawing which shows the other Example of the bolt type distortion detector which concerns on this invention. そのボルト型歪み検出器の使用状態の例を示す説明図。Explanatory drawing which shows the example of the use condition of the bolt type distortion detector. ボルト型歪み検出器とその使用状態の他の一例を示す説明図。Explanatory drawing which shows another example of a volt | bolt type | mold distortion detector and its use condition.

図1は、本発明に係るボルト型歪み検出器の一実施例を示す説明図である。ここで、Aは外観を、Bは縦断面を表している。また図2は、その組立説明図である。   FIG. 1 is an explanatory view showing an embodiment of a bolt-type strain detector according to the present invention. Here, A represents the appearance and B represents the longitudinal section. FIG. 2 is an assembly explanatory diagram thereof.

本発明に係るボルト型歪み検出器は、頭部と軸部を備えた頭部側部材10と、軸部のみからなる先端側部材11とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化して全体がボルト形状となるように構成したものである。通常のボルトと同様、先端側部材11の外周面には、固定ナット取り付け用のネジ部13が形成されている。頭部側部材10及び先端側部材11の中心には、軸方向に貫通する軸孔14,15が形成されており、ピエゾケーブル16を内蔵する前記センサロッド12を、前記頭部側部材10と先端側部材11の両方の軸孔14,15に挿通してエポキシ系などの接着剤で固着し、前記ピエゾケーブル16のリード部18を頭部側から外部へ引き出す構造である。   In the bolt-type strain detector according to the present invention, a head-side member 10 having a head and a shaft portion, and a tip-side member 11 consisting only of the shaft portion are arranged with an interval in the axial direction, The sensor rods 12 are inserted into the inside thereof, and are combined and integrated so that the whole becomes a bolt shape. Similar to a normal bolt, a screw portion 13 for attaching a fixing nut is formed on the outer peripheral surface of the distal end side member 11. Shaft holes 14 and 15 penetrating in the axial direction are formed in the center of the head-side member 10 and the tip-side member 11, and the sensor rod 12 containing the piezo cable 16 is connected to the head-side member 10. It is a structure that is inserted into both shaft holes 14 and 15 of the distal end side member 11 and fixed with an adhesive such as an epoxy, and the lead portion 18 of the piezo cable 16 is pulled out from the head side to the outside.

前記センサロッド12は、例えばピエゾケーブル16の外側を柔軟性を有する円筒状の保護チューブ20で被った構造とし、該保護チューブ20の外径はほぼ軸孔14の内径に一致したものとする。なお、保護チューブ20の先端は閉じていてもよい。ここでは、ピエゾケーブル16を保護チューブ20よりも若干短く設定し、先端部に接着剤21を充填して接着と封止を行っている。この保護チューブ20は、ピエゾケーブル16を保護するとともに、その材質と肉厚で撓みや変形を調整する機能を果たす。本発明に係るボルト型歪み検出器は、土木・建築構造物に直接取り付ける関係上、耐候性ならびに柔軟性の観点から、保護チューブ20の材料としてはウレタン樹脂が好ましい。   The sensor rod 12 has a structure in which, for example, the outer side of the piezo cable 16 is covered with a cylindrical protection tube 20 having flexibility, and the outer diameter of the protection tube 20 substantially coincides with the inner diameter of the shaft hole 14. Note that the tip of the protective tube 20 may be closed. Here, the piezo cable 16 is set slightly shorter than the protective tube 20, and the adhesive 21 is filled in the tip portion for bonding and sealing. The protective tube 20 protects the piezo cable 16 and functions to adjust flexure and deformation with its material and thickness. The bolt-type strain detector according to the present invention is preferably a urethane resin as a material of the protective tube 20 from the viewpoint of weather resistance and flexibility because it is directly attached to a civil engineering / building structure.

なお、ピエゾケーブル16は同軸ケーブルとして設計されているもので、市販品をそのまま用いることができる。図示していないが、例えば、中心に位置する芯線に、絶縁体となるVF2ピエゾフィルムテープをスパイラル状に巻き付け、その外側に銅網線を配し、更にポリエチレン外被で被覆した構造である。このようなピエゾケーブル16は、負荷を受けると伸び縮みし大きな電圧を発生する特徴がある。但し、本発明で使用可能なピエゾケーブルは、このような構造のみに限定されるものではない。伸びや撓みなどの変形に対して出力電圧を発生するケーブル状のものであればよい。   The piezo cable 16 is designed as a coaxial cable, and a commercially available product can be used as it is. Although not shown, for example, a VF2 piezo film tape as an insulator is spirally wound around a core wire located at the center, a copper mesh wire is arranged on the outer side, and further covered with a polyethylene jacket. Such a piezo cable 16 is characterized in that it expands and contracts when it receives a load and generates a large voltage. However, the piezo cable that can be used in the present invention is not limited to such a structure. Any cable-like one that generates an output voltage against deformation such as stretching or bending may be used.

ピエゾケーブル16の基端部には保護スリーブ22を装着し、リード線18を引出しコネクタ24に接続して、外部回路と接続できるように構成する。   A protective sleeve 22 is attached to the base end portion of the piezo cable 16, and the lead wire 18 is connected to the drawer connector 24 so that it can be connected to an external circuit.

本発明では、センサロッドを、その両端部で保持している頭部側部材と先端側部材とを互いに離間させているため、それらの間にはセンサロッドのみが存在することになり、伸縮、撓み、捩れなどの変形に対する検出感度が格段に向上する。なお、頭部側部材と先端側部材との離間距離、センサロッドを構成する保護チューブの材質や肉厚などは、測定状況などに応じて適宜変更することができる。   In the present invention, since the head side member and the tip side member holding the sensor rod at both ends thereof are separated from each other, only the sensor rod exists between them, and the expansion and contraction, The detection sensitivity for deformation such as bending and twisting is significantly improved. Note that the distance between the head-side member and the tip-side member, the material and thickness of the protective tube constituting the sensor rod, and the like can be changed as appropriate according to the measurement situation.

なお、上記の実施例において、ピエゾケーブルの外側を被う保護チューブにウレタン樹脂を用いているのは、柔軟性と耐候性に優れているからである。使用環境によっては、他の樹脂、例えばポリテトラフルオロエチレン樹脂や各種ゴムなどの素材を用いてもよい。なお、前記頭部側部材及び先端側部材は、市販品のボルトに軸孔を形成した後、軸部の中央部にて軸に垂直な面で分断加工することで製作してもよいし、頭部側部材と先端側部材を当初から別々に加工して必要な形状に製作してもよいことはいうまでもない。頭部側部材及び先端側部材は、通常、金属からなるが、用途などによっては樹脂やセラミックスからなるものでもよい。また、頭部側部材と先端側部材を別々の材質の組み合わせとすることも可能である。   In the above embodiment, the urethane resin is used for the protective tube covering the outside of the piezo cable because it is excellent in flexibility and weather resistance. Depending on the usage environment, other resins such as polytetrafluoroethylene resin and various rubbers may be used. In addition, the head side member and the tip side member may be manufactured by forming a shaft hole in a commercially available bolt and then cutting the surface at a center portion of the shaft portion in a plane perpendicular to the shaft. Needless to say, the head-side member and the tip-side member may be separately processed from the beginning to be manufactured into a required shape. The head side member and the tip side member are usually made of metal, but may be made of resin or ceramics depending on the application. It is also possible to combine the head side member and the tip side member with different materials.

図3は、本発明に係るボルト型歪み検出器の他の実施例を示す説明図である。この図3でも、Aは外観を、Bは縦断面を表している。基本的な構成は、頭部側部材及び先端側部材の形状・構造を除けば図1に示す構造と同様であってよい。そこで、説明を分かり易くするため、対応する部材には同一符号を付す。また図4は、その組立説明図である。   FIG. 3 is an explanatory view showing another embodiment of the bolt-type strain detector according to the present invention. Also in FIG. 3, A represents the appearance and B represents the longitudinal section. The basic configuration may be the same as that shown in FIG. 1 except for the shape and structure of the head-side member and the tip-side member. Therefore, in order to make the explanation easy to understand, the corresponding members are denoted by the same reference numerals. FIG. 4 is an assembly explanatory diagram thereof.

このボルト型歪み検出器も、頭部と軸部を備えた頭部側部材30と、軸部のみからなる先端側部材31とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化されて全体がボルト形状となるように構成されている。通常のボルトと同様、先端側部材31の外周面には、固定ナット取り付け用のネジ部33が形成されている。また、頭部側部材30及び先端側部材31の中心には、軸方向に貫通する軸孔34,35が形成されている。この実施例では、頭部側部材30には、その頭部の側面に径方向に軸孔34に至るネジ穴36が、1箇所もしくは複数箇所に形成されている。先端側部材31には、その先端側に薄肉円筒部37が延設されている。薄肉円筒部36には、軸方向に単一もしくは複数のスリットを設けてもよい。   In this bolt-type strain detector, a head-side member 30 having a head and a shaft portion, and a tip-side member 31 composed of only the shaft portion are arranged with an interval in the axial direction. The sensor rod 12 is inserted through and joined together to form a bolt shape as a whole. Similar to a normal bolt, a screw portion 33 for attaching a fixing nut is formed on the outer peripheral surface of the distal end side member 31. Further, axial holes 34 and 35 penetrating in the axial direction are formed at the centers of the head-side member 30 and the tip-side member 31. In this embodiment, the head-side member 30 is formed with one or a plurality of screw holes 36 that reach the shaft hole 34 in the radial direction on the side surface of the head. The distal end side member 31 has a thin cylindrical portion 37 extending on the distal end side. The thin cylindrical portion 36 may be provided with a single slit or a plurality of slits in the axial direction.

そして、ピエゾケーブル16を内蔵するセンサロッド12を、前記頭部側部材30と先端側部材31の両方の軸孔34,35に挿通し、頭部側部材30については、その頭部側面に径方向に形成したネジ穴36に、止めネジ38を螺着することでセンサロッド12を機械的に固定し、先端側部材31については、その先端側に延設した薄肉円筒部37をカシメることでセンサロッド12を機械的に固定する。勿論、接着剤を併用してもよい。それによって結合強度をより一層高めることができる。前記ピエゾケーブル16のリード部18は、頭部側から外部へ引き出す。このような機械的な固定構造は、保護チューブ20にポリテトラフルオロエチレン樹脂のような接着し難い素材を用いる場合には特に有効である。   The sensor rod 12 incorporating the piezo cable 16 is inserted into the shaft holes 34 and 35 of both the head-side member 30 and the tip-side member 31, and the head-side member 30 has a diameter on the side surface of the head. The sensor rod 12 is mechanically fixed by screwing a set screw 38 into a screw hole 36 formed in the direction, and the thin-walled cylindrical portion 37 extending to the distal end side of the distal end side member 31 is caulked. Thus, the sensor rod 12 is mechanically fixed. Of course, an adhesive may be used in combination. Thereby, the bond strength can be further increased. The lead portion 18 of the piezo cable 16 is pulled out from the head side. Such a mechanical fixing structure is particularly effective when a material that is difficult to adhere to, such as polytetrafluoroethylene resin, is used for the protective tube 20.

図5は、本発明に係るボルト型歪み検出器の更に他の実施例を示す説明図である。基本的な構成は、センサロッドを除けば、図1に示す構造と同様であってよい。そこで、ここでも説明を分かり易くするため、対応する部材には同一符号を付す。   FIG. 5 is an explanatory view showing still another embodiment of the bolt-type strain detector according to the present invention. The basic configuration may be the same as the structure shown in FIG. 1 except for the sensor rod. Therefore, in order to make the explanation easy to understand, corresponding members are denoted by the same reference numerals.

ボルト型歪み検出器は、頭部と軸部を備えた頭部側部材10と、軸部のみからなる先端側部材11とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化されて全体がボルト形状となるように構成されている。通常のボルトと同様、先端側部材11の外周面には、固定ナット取り付け用のネジ部13が形成されている。頭部側部材10及び先端側部材11の中心には、軸方向に貫通する軸孔14,15が形成されている。そして、ピエゾケーブル16を内蔵するセンサロッド40を、前記頭部側部材10と先端側部材11の両方の軸孔14,15に挿通して接着剤で固着し、前記ピエゾケーブル16のリード部18を頭部側から外部へ引き出す構造である。この実施例では、前記センサロッド40は、ピエゾケーブル16の外側を、ウレタン樹脂からなる保護チューブ42で取り囲み、更にその保護チューブ42の外側をセラミックスや工業プラスチックからなる外鞘44で被った構造としている。この構造は、設定値以上の荷重が加わり外鞘44が大きく屈曲変形したときに大きな出力電圧が生じるので、設定値以上の過大な荷重の検出測定に有効である。   In the bolt-type strain detector, a head-side member 10 having a head and a shaft portion and a tip-side member 11 consisting only of the shaft portion are arranged with an interval in the axial direction. The sensor rod 12 is inserted and combined so that the whole becomes a bolt shape. Similar to a normal bolt, a screw portion 13 for attaching a fixing nut is formed on the outer peripheral surface of the distal end side member 11. In the center of the head side member 10 and the tip side member 11, axial holes 14 and 15 penetrating in the axial direction are formed. The sensor rod 40 containing the piezo cable 16 is inserted into the shaft holes 14 and 15 of both the head side member 10 and the tip end member 11 and fixed with an adhesive, and the lead portion 18 of the piezo cable 16 is fixed. It is the structure which pulls out from the head side to the outside. In this embodiment, the sensor rod 40 has a structure in which the outer side of the piezo cable 16 is surrounded by a protective tube 42 made of urethane resin, and the outer side of the protective tube 42 is covered with an outer sheath 44 made of ceramics or industrial plastic. Yes. This structure is effective for detecting and measuring an excessive load exceeding the set value because a large output voltage is generated when a load exceeding the set value is applied and the outer sheath 44 is greatly bent and deformed.

本発明に係るボルト型歪み検出器の使用状態の一例を図6に示す。鉄骨や木材などからなる2体の構造物50,51間の相対的な変位を検出する場合である。ここでは、図1に示されている構造のボルト型歪み検出器を用いている。互いに接合されている2体の構造物50,51の連通するボルト挿入孔に、本発明に係るボルト型歪み検出器を挿通する。使用するボルト型歪み検出器は、2体の構造物50,51の境界に、中間部で露出しているセンサロッドの部分が位置するような寸法とする。挿通したボルト型歪み検出器は、ワッシャ52を介して緩み止めナット54を螺合し締め付けることで取り付ける。ダブルナットとすることで緩み止めを行う構造でもよい。従って、本発明に係るボルト型歪み検出器は、既存の構造物であっても、既に形成されているボルト挿入孔を利用して、簡単に且つ長期間にわたって安定的に取り付けることができる。このようにすると、2体の構造物間で、ずれや離間などの変位が発生すれば、ボルト型歪み検出器の撓みや伸びとして大きな電圧が発生し、それが外部回路で検出されることになる。しかも本発明においては、前述のように、センサロッドの構造、使用する材質、肉厚などの形状等を適宜選択することにより、歪みの検出感度などを調整することができる。   An example of the usage state of the bolt-type strain detector according to the present invention is shown in FIG. This is a case of detecting a relative displacement between two structures 50 and 51 made of a steel frame or wood. Here, a bolt type strain detector having the structure shown in FIG. 1 is used. The bolt-type strain detector according to the present invention is inserted into the bolt insertion hole where the two structures 50 and 51 joined to each other communicate with each other. The bolt-type strain detector to be used is sized so that the portion of the sensor rod exposed at the intermediate portion is located at the boundary between the two structures 50 and 51. The inserted bolt-type strain detector is attached by screwing and tightening a locking nut 54 via a washer 52. A structure that prevents loosening by using a double nut may be used. Therefore, the bolt-type strain detector according to the present invention can be easily and stably attached over a long period of time using an already formed bolt insertion hole even if it is an existing structure. In this way, if a displacement such as displacement or separation occurs between the two structures, a large voltage is generated as the deflection or extension of the bolt-type strain detector, which is detected by an external circuit. Become. Moreover, in the present invention, as described above, the strain detection sensitivity and the like can be adjusted by appropriately selecting the structure of the sensor rod, the material to be used, the shape such as the thickness, and the like.

図7は、本発明に係るボルト型歪み検出器の他の実施例を示す説明図である。この図7でも、Aは外観を、Bは縦断面を表している。基本的な構成は、先端側部材の形状・構造を除けば図1に示す構造と同様であってよい。そこで、説明を分かり易くするため、センサロッドなどの対応する部材には同一符号を付す。   FIG. 7 is an explanatory view showing another embodiment of the bolt-type strain detector according to the present invention. Also in FIG. 7, A represents the appearance and B represents the longitudinal section. The basic configuration may be the same as the structure shown in FIG. 1 except for the shape and structure of the distal end side member. Therefore, in order to make the explanation easy to understand, corresponding members such as sensor rods are denoted by the same reference numerals.

ボルト型歪み検出器は、頭部と軸部を備えた頭部側部材60と、軸部のみからなる先端側部材61とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化されて全体がボルト形状となるように構成されている。この実施例では、先端側部材61の外周面にはネジ部は不要である。頭部側部材60の中心には、軸方向に貫通する軸孔62が形成されているが、先端側部材61の軸孔63は非貫通(先端部は閉じている)となっている。従って、センサロッド12は、先端側部材61の途中までしか挿入されておらず、接着剤64で固着されている。また、前記先端側部材61の先端面寄りの位置(軸孔が非貫通の部分)で、直径方向に、ピン挿通用の貫通孔66が形成されている。この貫通孔66は、ボルト型歪み検出器を取り付ける際の固定用の割りピン68を挿入するためのものである。   In the bolt-type strain detector, a head-side member 60 having a head and a shaft portion and a tip-side member 61 composed of only the shaft portion are arranged with an interval in the axial direction. The sensor rod 12 is inserted and combined so that the whole becomes a bolt shape. In this embodiment, no screw portion is required on the outer peripheral surface of the distal end side member 61. A shaft hole 62 penetrating in the axial direction is formed at the center of the head-side member 60, but the shaft hole 63 of the tip-side member 61 is not penetrating (the tip is closed). Accordingly, the sensor rod 12 is inserted only halfway through the distal end side member 61 and is fixed by the adhesive 64. Further, a pin insertion through-hole 66 is formed in the diameter direction at a position near the front end surface of the front end side member 61 (a portion where the shaft hole is not through). This through hole 66 is for inserting a fixing split pin 68 when the bolt type strain detector is attached.

図8は、そのボルト型歪み検出器の使用状態を示している。説明を簡略化するために、図6と同様の取り付け状態を想定して描いてある。互いに接合されている2体の構造物50,51の連通するボルト挿入孔に、ボルト型歪み検出器を挿通する。使用するボルト型歪み検出器は、2体の構造物50,51の境界に、中間部で露出しているセンサロッドの部分が位置するような寸法とする。挿通したボルト型歪み検出器は、その先端側部材61に形成されているピン挿通用の貫通孔66に割りピン68を挿入して、該割りピン68の先端部を折り曲げることで保持される。この取り付け構造では、軸方向に多少のガタが生じるが、2体の構造物間の相対的なずれは検出できるし、離間もガタの範囲を超えて大きくなれば検出できる。   FIG. 8 shows the usage state of the bolt-type strain detector. In order to simplify the explanation, it is drawn assuming the same attachment state as in FIG. A bolt-type strain detector is inserted into a bolt insertion hole where the two structures 50 and 51 joined to each other communicate with each other. The bolt-type strain detector to be used is sized so that the portion of the sensor rod exposed at the intermediate portion is located at the boundary between the two structures 50 and 51. The inserted bolt-type strain detector is held by inserting a split pin 68 into a pin insertion through-hole 66 formed in the distal end side member 61 and bending the distal end portion of the split pin 68. In this mounting structure, some backlash occurs in the axial direction, but a relative shift between the two structures can be detected, and if the separation increases beyond the backlash range, it can be detected.

図9は、本発明に係るボルト型歪み検出器の他の実施例を示す説明図である。この図9でも、Aは外観を、Bは縦断面を表している。基本的な構成は、頭部側部材及び先端側部材の形状・構造を除けば図1に示す構造と同様であってよい。そこで、説明を分かり易くするため、対応する部材には同一符号を付す。   FIG. 9 is an explanatory view showing another embodiment of the bolt type strain detector according to the present invention. Also in FIG. 9, A represents the appearance and B represents the longitudinal section. The basic configuration may be the same as that shown in FIG. 1 except for the shape and structure of the head-side member and the tip-side member. Therefore, in order to make the explanation easy to understand, the corresponding members are denoted by the same reference numerals.

ボルト型歪み検出器は、頭部と軸部を備えた頭部側部材70と、軸部のみからなる先端側部材71とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化されて全体がボルト形状となるように構成されている。この実施例では、頭部側部材70の頭部は六角形でなくてもよく(ここでは円形としてある)、先端側部材71の外周面にはネジ部は形成されていない。頭部側部材70の中心には、軸方向に貫通する軸孔72が形成されているが、先端側部材71の軸孔73は非貫通(先端部は閉じている)となっている。従って、センサロッド12は、先端側部材71の途中までしか挿入されておらず、接着剤74で固着されている。この実施例では、頭部側部材70の軸部外周に、先細状の圧着用テーパ部76が形成されている。この圧着用テーパ部76は、頭部側部材と一体に成形したものでもよいし、別体として成形し固着したものでもよい。その場合、頭部側部材と材質の異なるものでもよく、従って樹脂などでもよい。テーパ面にはローレット加工など、適度な凹凸形状にして滑り止め効果を持たせるのが好ましい。また、ここでは、前記先端側部材71の先端部は、取り付け時に構造物のボルト挿入孔に挿入し易くするために先細形状にしている。   In the bolt-type strain detector, a head-side member 70 having a head and a shaft portion and a tip-side member 71 composed of only the shaft portion are arranged with an interval in the axial direction. The sensor rod 12 is inserted and combined so that the whole becomes a bolt shape. In this embodiment, the head of the head-side member 70 does not have to be hexagonal (here, circular), and no screw portion is formed on the outer peripheral surface of the tip-side member 71. A shaft hole 72 penetrating in the axial direction is formed at the center of the head-side member 70, but the shaft hole 73 of the tip-side member 71 is not penetrating (the tip is closed). Therefore, the sensor rod 12 is inserted only halfway through the distal end side member 71 and is fixed by the adhesive 74. In this embodiment, a tapered crimping taper portion 76 is formed on the outer periphery of the shaft portion of the head-side member 70. The crimping taper portion 76 may be formed integrally with the head-side member, or may be formed and fixed separately. In that case, the material may be different from that of the head-side member, and thus resin or the like may be used. It is preferable that the taper surface has an appropriate uneven shape such as knurling so as to have an anti-slip effect. In addition, here, the distal end portion of the distal end side member 71 has a tapered shape so that it can be easily inserted into the bolt insertion hole of the structure at the time of attachment.

図10は、そのボルト型歪み検出器の使用状態を示している。このボルト型歪み検出器は、少なくとも表側(挿入する際の手前側)は木造構造物など比較的柔らかい構造物で、裏側(奥側)に工具が入らないような箇所に取り付ける場合に有効である。ここでは、表側と裏側の構造物80,81は共に木造であり、表側の構造物80ではボルト挿入孔は貫通しているが、裏側の構造物81ではボルト挿入孔は非貫通で袋孔という想定で取り付け状態を描いてある。表側の構造物80のボルト挿入孔の孔径は、ボルト型歪み検出器の圧着用テーパ部76の大径部と小径部の中間の大きさとする。ボルト型歪み検出器は、2体の構造物80,81の境界に、中間部で露出しているセンサロッドの部分が位置するような寸法とする。互いに接合されている構造物80,81の連通するボルト挿入孔に、ボルト型歪み検出器を差し入れ、保護スリーブ22やリード線18などを痛めないように治具を介して打ち込む。すると、頭部側部材70の軸部外周に形成されている先細状の圧着用テーパ部76が、表側の構造物80の孔壁に食い込み固定される。必要に応じて、裏側の構造物81のボルト挿入孔にコーキング剤などを塗布しておけば、ボルト型歪み検出器の先端側部材71とのガタも解消できる。   FIG. 10 shows the usage state of the bolt-type strain detector. This bolt-type strain detector is effective when it is attached to a place where a tool does not enter the back side (back side) at least on the front side (front side when inserting) is a relatively soft structure such as a wooden structure. . Here, both the front and back structures 80 and 81 are made of wood, and the bolt insertion hole penetrates the front structure 80, but the bolt insertion hole does not penetrate the back structure 81 and is referred to as a bag hole. The attached state is drawn by assumption. The diameter of the bolt insertion hole of the structure 80 on the front side is set to an intermediate size between the large diameter portion and the small diameter portion of the crimping taper portion 76 of the bolt-type strain detector. The bolt-type strain detector is sized so that the portion of the sensor rod exposed at the intermediate portion is located at the boundary between the two structures 80 and 81. A bolt-type strain detector is inserted into a bolt insertion hole communicating with the structures 80 and 81 joined to each other, and is driven through a jig so as not to damage the protective sleeve 22 and the lead wire 18. Then, the tapered crimping taper portion 76 formed on the outer periphery of the shaft portion of the head-side member 70 is fixed by biting into the hole wall of the structure 80 on the front side. If necessary, if a caulking agent or the like is applied to the bolt insertion hole of the structure 81 on the back side, backlash with the tip side member 71 of the bolt-type strain detector can be eliminated.

図11は、ボルト型歪み検出器とその使用状態の他の例であり、Aはボルト型歪み検出器を、Bはその使用状態を示している。ボルト型歪み検出器は、図9に示すものに類似しているが、圧着用テーパ部は備えていない点が異なる。ボルト型歪み検出器は、頭部と軸部を備えた頭部側部材90と、軸部のみからなる先端側部材91とが、軸方向で間隔をあけて配置されており、それらの内部にセンサロッド12を挿通し、結合一体化されて全体がボルト形状となるように構成されている。この実施例では、頭部側部材90の頭部は円形であり、先端側部材91の外周面にネジ部はない。図示されていないが、図9と同様、頭部側部材90の中心には、軸方向に貫通する軸孔が形成されているが、先端側部材91の軸孔は非貫通(先端部は閉じている)となっている。従って、センサロッド12は、先端側部材91の途中まで挿入され、接着剤で固着されている。ここでも、前記先端側部材91の先端部は、取り付け時に構造物のボルト挿入孔に挿入し易くするために先細形状にしている。   FIG. 11 shows another example of the bolt-type strain detector and its use state. A shows the bolt-type strain detector and B shows the use state. The bolt-type strain detector is similar to that shown in FIG. 9 except that it does not have a crimping taper. In the bolt-type strain detector, a head-side member 90 having a head and a shaft portion and a tip-side member 91 made of only the shaft portion are arranged with an interval in the axial direction. The sensor rod 12 is inserted and combined so that the whole becomes a bolt shape. In this embodiment, the head of the head-side member 90 is circular, and there is no screw portion on the outer peripheral surface of the tip-side member 91. Although not shown, an axial hole penetrating in the axial direction is formed at the center of the head side member 90 as in FIG. 9, but the axial hole of the distal end side member 91 is not penetrating (the distal end is closed). It is). Therefore, the sensor rod 12 is inserted partway through the distal end side member 91 and is fixed with an adhesive. Again, the tip of the tip side member 91 is tapered to facilitate insertion into the bolt insertion hole of the structure during attachment.

このボルト型歪み検出器も、図10と同様、裏側に工具が入らないような箇所に取り付ける場合に有効である。この場合、表側は鉄骨など硬い構造物でもよい。表側の構造物ではボルト挿入孔は貫通しているが、裏側の構造物ではボルト挿入孔は非貫通で袋孔となっているという想定で取り付け状態を描いてある。表側の構造物のボルト挿入孔の孔径は、頭部側部材90の軸部径よりもかなり大きめである。ボルト型歪み検出器は、2体の構造物80,81の境界に、中間部で露出しているセンサロッドの部分が位置するような寸法とする。   This bolt type strain detector is also effective in the case where it is attached to a place where the tool does not enter on the back side, as in FIG. In this case, the front side may be a hard structure such as a steel frame. In the structure on the front side, the bolt insertion hole penetrates, but in the structure on the back side, the mounting state is drawn on the assumption that the bolt insertion hole is not penetrating and is a bag hole. The hole diameter of the bolt insertion hole of the structure on the front side is considerably larger than the diameter of the shaft portion of the head-side member 90. The bolt-type strain detector is sized so that the portion of the sensor rod exposed at the intermediate portion is located at the boundary between the two structures 80 and 81.

ボルト型歪み検出器の頭部側部材90の軸部に、板バネ92を添えて、互いに接合されている2体の構造物80,81の連通するボルト挿入孔に差し入れる。板バネ92は、端面が弧状の細長形状であり、その凹面がボルト型歪み検出器の軸部に対向するように沿わせる。ボルト挿入孔に差し入れる際、板バネ92を潰して高さを下げた状態とする。そして、保護スリーブ22やリード線18などを痛めないように治具を介して打ち込む。すると、ボルト挿入孔内で板バネ92は元の形状に戻ろうと膨らみ、それによって頭部側部材90の軸部が孔壁に圧着される。必要に応じて、裏側の構造物80のボルト挿入孔にコーキング剤などを塗布しておけば、ボルト型歪み検出器の先端側部材91とのガタも解消できる   A plate spring 92 is attached to the shaft portion of the head-side member 90 of the bolt-type strain detector, and is inserted into a bolt insertion hole where two structures 80 and 81 joined to each other communicate. The leaf spring 92 has an elongated shape with an arc-shaped end surface, and the concave surface thereof extends along the shaft portion of the bolt-type strain detector. When inserting into the bolt insertion hole, the leaf spring 92 is crushed and the height is lowered. Then, the protective sleeve 22 and the lead wire 18 are driven through a jig so as not to hurt. Then, the leaf spring 92 swells in the bolt insertion hole so as to return to its original shape, whereby the shaft portion of the head-side member 90 is pressed against the hole wall. If necessary, if a caulking agent or the like is applied to the bolt insertion hole of the structure 80 on the back side, the backlash with the tip side member 91 of the bolt type strain detector can be eliminated.

本発明に係るボルト型歪み検出器は、上記のような機械的な固定方法のみならず、接着剤によって構造物に固定することも可能である。   The bolt type strain detector according to the present invention can be fixed not only to the mechanical fixing method as described above but also to the structure with an adhesive.

10 頭部側部材
11 先端側部材
12 センサロッド
14,15 軸孔
16 ピエゾケーブル
18 リード線
20 保護チューブ
DESCRIPTION OF SYMBOLS 10 Head side member 11 Tip side member 12 Sensor rod 14, 15 Shaft hole 16 Piezo cable 18 Lead wire 20 Protection tube

Claims (8)

頭部と軸部を備え軸方向に貫通する軸孔が形成されている頭部側部材と、軸部のみからなり基端から先端に向かう軸孔が形成されている先端側部材とが、軸方向で間隔をあけた状態で配置され、それら頭部側部材と先端側部材の軸孔にピエゾケーブルを内蔵するセンサロッドが挿通され、前記頭部側部材と前記先端側部材とが前記センサロッドの両端部で結合されて、全体がボルト形状に一体化されており、前記ピエゾケーブルのリード部を頭部側から外部へ引き出すようにしたことを特徴とするボルト型歪み検出器。   A head-side member having a head and a shaft portion and having a shaft hole penetrating in the axial direction, and a tip-side member having only a shaft portion and having a shaft hole extending from the base end to the tip end are Sensor rods that are arranged at intervals in the direction and that have a piezo cable built in the shaft holes of the head-side member and the tip-side member are inserted, and the head-side member and the tip-side member are connected to the sensor rod The bolt-type strain detector is characterized in that it is joined at both ends of the two and integrated into a bolt shape, and the lead portion of the piezo cable is drawn out from the head side to the outside. 前記センサロッドは、中心に位置する細長状のピエゾケーブルが、柔軟性素材からなる保護チューブで取り囲まれた構造をなしている請求項1記載のボルト型歪み検出器。   2. The bolt-type strain detector according to claim 1, wherein the sensor rod has a structure in which an elongated piezo cable located at the center is surrounded by a protective tube made of a flexible material. 前記センサロッドは、中心に位置する細長状のピエゾケーブルが、柔軟性素材からなる保護チューブで取り囲まれ、更に該保護チューブの外側が屈曲可能な素材からなる外鞘で被われた構造をなしている請求項1記載のボルト型歪み検出器。   The sensor rod has a structure in which an elongated piezo cable located at the center is surrounded by a protective tube made of a flexible material, and the outer side of the protective tube is covered with an outer sheath made of a bendable material. The bolt type strain detector according to claim 1. 前記頭部側部材は、その頭部の側面に径方向に軸孔に至るネジ穴が形成され、該ネジ穴に螺合する止めネジで前記センサロッドが固定されている請求項1乃至3のいずれかに記載のボルト型歪み検出器。   4. The head portion member according to claim 1, wherein a screw hole reaching a shaft hole in a radial direction is formed on a side surface of the head portion, and the sensor rod is fixed by a set screw screwed into the screw hole. The bolt type strain detector according to any one of the above. 前記先端側部材は、その先端側に薄肉円筒部が延設され、該薄肉円筒部のカシメによって前記センサロッドが固定されている請求項1乃至4のいずれかに記載のボルト型歪み検出器。   The bolt-type strain detector according to any one of claims 1 to 4, wherein a thin cylindrical portion extends from the distal end side of the distal end member, and the sensor rod is fixed by caulking of the thin cylindrical portion. 前記先端側部材の外周面に、固定ナット取り付け用のネジ部が形成されている請求項1乃至5のいずれかに記載のボルト型歪み検出器。   The bolt type strain detector according to any one of claims 1 to 5, wherein a screw portion for attaching a fixing nut is formed on an outer peripheral surface of the tip side member. 前記先端側部材の先端寄りの位置に、ピン挿通用の貫通孔が直径方向に形成されている請求項1乃至4のいずれかに記載のボルト型歪み検出器。   The bolt type strain detector according to any one of claims 1 to 4, wherein a through hole for inserting a pin is formed in a diametrical direction at a position near the tip of the tip side member. 前記頭部側部材の軸部外周に、先細状の圧着用テーパ部が形成されている請求項1乃至5のいずれかに記載のボルト型歪み検出器。   The bolt type distortion detector according to any one of claims 1 to 5, wherein a tapered crimping taper portion is formed on an outer periphery of the shaft portion of the head side member.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015169462A (en) * 2014-03-05 2015-09-28 公立大学法人秋田県立大学 limit type displacement detector
JP2015189128A (en) * 2014-03-28 2015-11-02 三洋熱工業株式会社 Method for fitting casting heater to injection nozzle of injection molding device and fitting structure of casting heater to the injection nozzle of injection molding device
WO2016047603A1 (en) * 2014-09-24 2016-03-31 株式会社NejiLaw Measurement method for building
CN107014443A (en) * 2017-05-25 2017-08-04 深圳中研塑力科技有限公司 Suitable for the inner insert stress strain gauge of structural member
JP2017194847A (en) * 2016-04-21 2017-10-26 公立大学法人秋田県立大学 Avalanche/rockfall monitoring system
CN109556562A (en) * 2018-12-21 2019-04-02 沈阳智航智能***有限公司 A kind of reusable bolt load sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015169462A (en) * 2014-03-05 2015-09-28 公立大学法人秋田県立大学 limit type displacement detector
JP2015189128A (en) * 2014-03-28 2015-11-02 三洋熱工業株式会社 Method for fitting casting heater to injection nozzle of injection molding device and fitting structure of casting heater to the injection nozzle of injection molding device
WO2016047603A1 (en) * 2014-09-24 2016-03-31 株式会社NejiLaw Measurement method for building
JP2016065754A (en) * 2014-09-24 2016-04-28 株式会社NejiLaw Method for measuring building structure
JP2017194847A (en) * 2016-04-21 2017-10-26 公立大学法人秋田県立大学 Avalanche/rockfall monitoring system
CN107014443A (en) * 2017-05-25 2017-08-04 深圳中研塑力科技有限公司 Suitable for the inner insert stress strain gauge of structural member
CN109556562A (en) * 2018-12-21 2019-04-02 沈阳智航智能***有限公司 A kind of reusable bolt load sensor

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