JP2020133369A - Concrete detector - Google Patents

Concrete detector Download PDF

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JP2020133369A
JP2020133369A JP2019032603A JP2019032603A JP2020133369A JP 2020133369 A JP2020133369 A JP 2020133369A JP 2019032603 A JP2019032603 A JP 2019032603A JP 2019032603 A JP2019032603 A JP 2019032603A JP 2020133369 A JP2020133369 A JP 2020133369A
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concrete
proximity switch
tip
detector
peripheral surface
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JP7170990B2 (en
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常秀 大久保
Tsunehide Okubo
常秀 大久保
冨弘 棚瀬
Tomihiro Tanase
冨弘 棚瀬
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Gifu Industry Co Ltd
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Gifu Industry Co Ltd
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  • Lining And Supports For Tunnels (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

To provide a concrete detector sufficiently small sized and economical compared with conventional ones.SOLUTION: The concrete detector comprises a rod-like proximity switch 4 in capacitance shape and fastening means 2 for fastening the proximity switch 4 to a frame plate P in the state that a tip detection part 41 is apart from an inner peripheral surface of a detection opening P1 by a gap d in the detection opening P1 provided on the frame plate P for forming a concrete filling space S. A metal layer is provided so as to cover a peripheral surface of the tip detection part 41 of the proximity switch 4. This metal layer is configured with a peripheral wall 52 of a metal cap 5 covering the peripheral surface and an end surface of the tip detection part 41.SELECTED DRAWING: Figure 2

Description

本発明はコンクリート検出器に関し、特に小型かつ安価なコンクリート検出器に関するものである。 The present invention relates to a concrete detector, particularly a small and inexpensive concrete detector.

トンネルセントルの外周とトンネル内壁との間に形成された円弧状空間内へ覆工コンクリートを充填する際に、空間内のどの位置までコンクリートが充填されているかを検出することが求められており、このような用途に、静電容量式のレベルスイッチ(例えばシーエル計測工業(株)製 C−1000型)が使用されている。 When filling the arc-shaped space formed between the outer circumference of the tunnel center and the inner wall of the tunnel with lining concrete, it is required to detect to what position in the space the concrete is filled. Capacitive level switches (for example, C-1000 type manufactured by CEL Measurement Industry Co., Ltd.) are used for such applications.

なお、コンクリート検出器としては、特許文献1に示された光センサを利用したもの、あるいは特許文献2に示されたコンクリート圧を検出するもの等が知られている。 As the concrete detector, one using the optical sensor shown in Patent Document 1 or one for detecting the concrete pressure shown in Patent Document 2 is known.

特開平6−240868号JP-A-6-240868 特開平3−274421号Japanese Patent Application Laid-Open No. 3-274421

ところで従来使用されている静電容量式の上記レベルスイッチは大型でかつ値段も比較的高い。一方、近年はIoT(Internet of Things)の進展に伴って、より精密な覆工コンクリート充填情報の提供が望まれており、そのためにはコンクリート検出器を多数設置する必要があって、小型かつ安価なコンクリート検出器の実現が待たれていた。 By the way, the above-mentioned capacitance type level switch conventionally used is large and relatively expensive. On the other hand, in recent years, with the progress of IoT (Internet of Things), it is desired to provide more precise lining concrete filling information, and for that purpose, it is necessary to install a large number of concrete detectors, which is compact and inexpensive. The realization of a concrete detector has been awaited.

そこで、本発明はこのような課題を解決するもので、従来に比して十分に小型で安価なコンクリート検出器を提供することを目的とする。 Therefore, the present invention solves such a problem, and an object of the present invention is to provide a concrete detector that is sufficiently small and inexpensive as compared with the conventional one.

上記目的を達成するために、本第1発明では、静電容量形の棒状の近接スイッチ(4)と、コンクリート充填空間(S)を形成する枠板(P)に設けた検出開口(P1)内に、先端検出部(41)を前記検出開口(P1)の内周面と間隔(d)を離した状態で前記近接スイッチ(4)を前記枠板(P)に固定する固定手段(2)とを備え、かつ、前記近接スイッチ(4)の先端検出部(41)の周面を覆うように金属層(52)が設けられている。 In order to achieve the above object, in the first invention, a capacitance type rod-shaped proximity switch (4) and a detection opening (P1) provided in a frame plate (P) forming a concrete filling space (S). Fixing means (2) for fixing the proximity switch (4) to the frame plate (P) with the tip detecting portion (41) separated from the inner peripheral surface of the detection opening (P1) at a distance (d). ), And a metal layer (52) is provided so as to cover the peripheral surface of the tip detection portion (41) of the proximity switch (4).

本第1発明によれば、近接スイッチを検出開口内に位置させるだけの簡易な構成で従来に比して十分に小型で安価なコンクリート検出器を実現することができる。特に金属層を設けたことによって先端検出部と検出開口の内周面との間隔を十分小さくできるから検出開口をより小さくすることが可能で、コンクリート検出器全体をよりコンパクトに設置することができる。また、金属層を設けたことによって確実な検出が可能になる。 According to the first invention, it is possible to realize a concrete detector that is sufficiently small and inexpensive as compared with the conventional case by a simple configuration in which the proximity switch is positioned in the detection opening. In particular, by providing a metal layer, the distance between the tip detection portion and the inner peripheral surface of the detection opening can be sufficiently reduced, so that the detection opening can be made smaller, and the entire concrete detector can be installed more compactly. .. Further, by providing the metal layer, reliable detection becomes possible.

本第2発明では、前記金属層が、前記先端検出部(41)の周面と端面を覆う金属製キャップ(5)の周壁(52)によって構成されている。 In the second invention, the metal layer is composed of a peripheral surface (52) of a metal cap (5) that covers the peripheral surface and the end surface of the tip detection portion (41).

本第2発明によれば、先端検出部に金属製キャップを装着するだけの簡易な構造で金属層を設けることができるとともに、先端検出部の端面を摩耗から守ることができる。 According to the second invention, the metal layer can be provided with a simple structure in which a metal cap is simply attached to the tip detection portion, and the end face of the tip detection portion can be protected from wear.

本第3発明では、前記金属製キャップ(5)の端面はその中心部(511)のみがコンクリート充填空間(S)へ露出している。 In the third invention, only the central portion (511) of the end face of the metal cap (5) is exposed to the concrete filling space (S).

本第3発明によれば、端面の中心部のみをコンクリート充填空間へ露出させたから、端面全面を露出させるのに比して、反応面積を少なくすることによって、硬化したコンクリートや水滴等の付着による影響を受けにくくし誤検出をより効果的に避けることができる。 According to the third invention, since only the central portion of the end face is exposed to the concrete filling space, the reaction area is reduced as compared with exposing the entire end face, so that hardened concrete, water droplets, etc. adhere to the concrete. It is less susceptible and false positives can be avoided more effectively.

本第4発明では、前記近接スイッチ(4)の先端検出部(41)周囲を覆うように前記検出開口(P1)内に前記間隔(d)を確保する厚みを有して装着される筒状の絶縁体(3)をさらに備える。 In the fourth invention, a tubular shape is mounted in the detection opening (P1) so as to cover the periphery of the tip detection portion (41) of the proximity switch (4) so as to secure the space (d). The insulator (3) is further provided.

本第4発明によれば、絶縁体によって近接スイッチが確実に保持されるとともに、検出開口の液密性を簡易に確保することができる。 According to the fourth invention, the proximity switch can be reliably held by the insulator, and the liquidtightness of the detection opening can be easily ensured.

本第5発明では、前記固定手段(2)は前記絶縁体(3)の姿勢が目視できる状態で当該絶縁体(3)を固定するものである。 In the fifth invention, the fixing means (2) fixes the insulator (3) in a state where the posture of the insulator (3) can be visually recognized.

本第5発明によれば、絶縁体が適正に検出開口内に位置して液密性が確保されている等を目視で確認することができる。 According to the fifth invention, it is possible to visually confirm that the insulator is properly positioned in the detection opening and the liquidtightness is ensured.

上記カッコ内の符号は、後述する実施形態に記載の具体的手段との対応関係を参考的に示すものである。 The reference numerals in parentheses indicate the correspondence with the specific means described in the embodiments described later for reference.

以上のように、本発明のコンクリート検出器は、従来に比して十分に小型で安価なものとできる。 As described above, the concrete detector of the present invention can be made sufficiently small and inexpensive as compared with the conventional one.

コンクリート検出器を設けたトンネルセントルの枠体の正面図である。It is a front view of the frame of the tunnel center provided with the concrete detector. 本発明の第1実施形態における、コンクリート検出器の全体断面図である。It is an overall sectional view of the concrete detector in 1st Embodiment of this invention. 検出器本体の断面図である。It is sectional drawing of the detector main body. 検出器本体の分解断面図である。It is an exploded sectional view of a detector main body. 本発明の第2実施形態における、コンクリート検出器の全体断面図である。It is an overall sectional view of the concrete detector in the 2nd Embodiment of this invention. 本発明の第3実施形態における、検出器本体の断面図である。It is sectional drawing of the detector main body in 3rd Embodiment of this invention. 検出器本体の分解断面図である。It is an exploded sectional view of a detector main body.

なお、以下に説明する実施形態はあくまで一例であり、本発明の要旨を逸脱しない範囲で当業者が行う種々の設計的改良も本発明の範囲に含まれる。 It should be noted that the embodiments described below are merely examples, and various design improvements made by those skilled in the art within the scope of the present invention are also included in the scope of the present invention.

(第1実施形態)
図1には本発明のコンクリート検出器Dtを設けたトンネルセントルMを示す。すなわち、内壁が円弧状をなすトンネルTの内方位置に円弧状をなすトンネルセントルMが位置しており、トンネルセントルMの外周とトンネルTの内壁との間に覆工コンクリートCを充填するための円弧状の充填空間Sが形成されている。トンネルセントルMは中央の天端フォームFaと、その左右端に公知の構造で回動可能に連結された側フォームFb、および側フォームFbの下端に公知の構造で回動可能に連結されたインバートフォームFcで構成されている。そして、各フォームFa〜Fcの外周(より正確には外周を構成するスキンプレート)には詳細を以下に説明するコンクリート検出器Dtが、トンネルセントルMの外周方向へ所定の間隔をおいて複数設置されている。なお、図1は覆工コンクリートCがインバートフォームFcから側フォームFbの下部にかけての充填空間S内に充填されつつあるところを示している。
(First Embodiment)
FIG. 1 shows a tunnel center M provided with the concrete detector Dt of the present invention. That is, the tunnel centle M having an arc shape is located at the inner position of the tunnel T whose inner wall has an arc shape, and the lining concrete C is filled between the outer circumference of the tunnel center M and the inner wall of the tunnel T. Arc-shaped filling space S is formed. The tunnel center M has a central top foam Fa, a side foam Fb rotatably connected to the left and right ends thereof with a known structure, and an invert rotatably connected to the lower end of the side foam Fb with a known structure. It is composed of foam Fc. Then, a plurality of concrete detectors Dt, which will be described in detail below, are installed on the outer circumferences of the foams Fa to Fc (more accurately, the skin plates constituting the outer circumferences) at predetermined intervals in the outer circumference direction of the tunnel center M. Has been done. Note that FIG. 1 shows that the lining concrete C is being filled in the filling space S from the invert foam Fc to the lower part of the side foam Fb.

図2にはコンクリート検出器Dtの一部断面側面図を示す。図2において、枠体としてのスキンプレートPには所定位置に円形の検出開口P1が設けてあり、スキンプレートPの外側面とその外方のトンネル内周壁(図示略)との間に充填空間Sが形成されている。そして、スキンプレートPの内側には検出開口P1に臨んで詳細を後述する検出器本体1が装着されており、検出器本体1から離れた位置には検出器本体1を固定するための詳細を後述する固定手段2が設けられている。 FIG. 2 shows a partial cross-sectional side view of the concrete detector Dt. In FIG. 2, the skin plate P as a frame body is provided with a circular detection opening P1 at a predetermined position, and a filling space is provided between the outer surface of the skin plate P and the inner peripheral wall of the tunnel (not shown). S is formed. A detector body 1 whose details will be described later is mounted inside the skin plate P so as to face the detection opening P1. Details for fixing the detector body 1 at a position away from the detector body 1 are provided. The fixing means 2 described later is provided.

図3には検出器本体1の断面図を示し、図4にはその分解断面図を示す。検出器本体1を構成する絶縁体3は電気絶縁性の例えば樹脂で成形されており、先端部31が段付きに小径となった一定厚の円筒状となっている。絶縁体3の先端部31の外径は検出開口P1の内径にほぼ等しく、先端部31の長さはスキンプレートPの厚みに等しくなっている。これにより、絶縁体3はその先端部31が検出開口P1内に液密的に嵌着されている(図3)。ここで、絶縁体3の先端部31の厚みは、後述する近接スイッチ4がスキンプレートPの影響を受けて誤作動しないだけの間隔dを検出開口P1内周との間に確保できる寸法としてある。 FIG. 3 shows a cross-sectional view of the detector main body 1, and FIG. 4 shows an exploded cross-sectional view thereof. The insulator 3 constituting the detector main body 1 is formed of, for example, an electrically insulating resin, and has a cylindrical shape having a constant thickness in which the tip portion 31 has a stepped small diameter. The outer diameter of the tip portion 31 of the insulator 3 is substantially equal to the inner diameter of the detection opening P1, and the length of the tip portion 31 is equal to the thickness of the skin plate P. As a result, the tip portion 31 of the insulator 3 is liquid-tightly fitted in the detection opening P1 (FIG. 3). Here, the thickness of the tip portion 31 of the insulator 3 is a dimension that can secure an interval d between the inner circumference of the detection opening P1 and the proximity switch 4 described later so as not to malfunction due to the influence of the skin plate P. ..

絶縁体3の筒内には、棒状の静電容量型近接スイッチ4のやや小径となった先端検出部41が挿入されている。この先端検出部41には端面全面と周面を覆って金属製のキャップ5が被せられており、キャップ5の端壁51は絶縁体3の外側開口端面およびスキンプレートPの外側面と同一面に位置させられている(図3)。 Inside the cylinder of the insulator 3, a tip detecting portion 41 having a slightly smaller diameter of the rod-shaped capacitance type proximity switch 4 is inserted. The tip detection portion 41 is covered with a metal cap 5 covering the entire end surface and the peripheral surface, and the end wall 51 of the cap 5 is flush with the outer open end surface of the insulator 3 and the outer surface of the skin plate P. It is located in (Fig. 3).

このようなキャップ5の端壁51によって、スキンプレートPのケレン作業等で近接スイッチ4の先端検出部41が摩耗する等の問題が避けられるとともに、キャップ5の周壁52によって、先端検出部41の周面を覆うように金属層が設けられる。そして、金属層を設けたことによって、金属層が無い場合に比して検出開口P1内周との間の間隔dを小さくしてもスキンプレートPの影響を受けて誤作動することが無くなる。この結果、検出開口P1を小さくすることができて検出器本体1全体を小型化することができる。また、金属層を設けると上記近接スイッチ4がタッチセンサのように機能して、先端検出部41に誘電率の異なる物質、すなわち覆工コンクリートが接触するまで作動することは無い。これによって確実な検出が可能になる。 The end wall 51 of the cap 5 avoids problems such as the tip detection portion 41 of the proximity switch 4 being worn due to the cleaning work of the skin plate P, and the peripheral wall 52 of the cap 5 prevents the tip detection portion 41 from being worn. A metal layer is provided so as to cover the peripheral surface. By providing the metal layer, even if the distance d between the detection opening P1 and the inner circumference is reduced as compared with the case where there is no metal layer, the skin plate P does not affect the malfunction. As a result, the detection opening P1 can be made smaller, and the entire detector main body 1 can be made smaller. Further, when the metal layer is provided, the proximity switch 4 functions like a touch sensor and does not operate until a substance having a different dielectric constant, that is, lining concrete, comes into contact with the tip detecting portion 41. This enables reliable detection.

上記キャップ5の開口端面は絶縁体3の内周に形成された段付き面32に当接しており、この状態でキャップ5は絶縁体3の内周に接着固定されている。また、近接スイッチ4の後端からは信号線44が延出している。近接スイッチ4としては例えばオムロン(株)製E2K−X等が好適に使用できる。 The open end surface of the cap 5 is in contact with the stepped surface 32 formed on the inner circumference of the insulator 3, and in this state, the cap 5 is adhesively fixed to the inner circumference of the insulator 3. Further, a signal line 44 extends from the rear end of the proximity switch 4. As the proximity switch 4, for example, E2K-X manufactured by OMRON Corporation can be preferably used.

図2において、固定手段2はL字形に屈曲した抑え板21を備えており、その長辺の先端部はここに設けた開口211によって近接スイッチ4の中間ねじ部42に嵌装され、中間ねじ部42に螺合させたナット部材11を介して絶縁体3の後端面を押圧している。上記抑え板21の先端部には筒体22が形成されて、抑え板21の先端部を近接スイッチ4の中間ねじ部42に嵌装した際に当該中間ねじ部42と基端部43、さらに信号線44の基端部43からの取出し端が筒体22内に位置して外部から保護される。 In FIG. 2, the fixing means 2 includes a holding plate 21 bent in an L shape, and the tip end portion of the long side thereof is fitted to the intermediate screw portion 42 of the proximity switch 4 by the opening 211 provided here, and the intermediate screw The rear end surface of the insulator 3 is pressed via the nut member 11 screwed into the portion 42. A tubular body 22 is formed at the tip of the holding plate 21, and when the tip of the holding plate 21 is fitted to the intermediate screw portion 42 of the proximity switch 4, the intermediate screw portion 42, the base end portion 43, and further. The take-out end of the signal line 44 from the base end portion 43 is located inside the tubular body 22 and is protected from the outside.

抑え板21の長辺基端部に設けた開口213にはボルト23が挿通されて、当該ボルト23はスキンプレートPの裏面に固着されたウェルドナット24に結合されている。そして、ボルト23をウェルドナット24に適度にねじ込むことによって絶縁体3が適当な力でスキンプレートPに圧接されて検出器本体1が固定される。このような固定手段2によれば、絶縁体3の姿勢を常に外部から目視することができるから、絶縁体3(および近接スイッチ4が検出開口P1内に適正に位置していることが確認できる。 A bolt 23 is inserted into the opening 213 provided at the base end of the long side of the holding plate 21, and the bolt 23 is coupled to a weld nut 24 fixed to the back surface of the skin plate P. Then, by appropriately screwing the bolt 23 into the weld nut 24, the insulator 3 is pressed against the skin plate P with an appropriate force, and the detector main body 1 is fixed. According to such a fixing means 2, the posture of the insulator 3 can always be visually observed from the outside, so that it can be confirmed that the insulator 3 (and the proximity switch 4 are properly positioned in the detection opening P1). ..

このようなコンクリート検出器によれば、充填空間S内に充填された覆工コンクリートCのコンクリート面が近接スイッチ4の先端検出部41を覆うキャップ5部分に至ると、近接スイッチ4がこれを検知して検出信号が出力される。これにより、覆工コンクリートCの充填位置を確認することができる。 According to such a concrete detector, when the concrete surface of the lining concrete C filled in the filling space S reaches the cap 5 portion covering the tip detection portion 41 of the proximity switch 4, the proximity switch 4 detects this. And the detection signal is output. As a result, the filling position of the lining concrete C can be confirmed.

(第2実施形態)
図5には固定手段2の他の例を示す。ここでは、固定手段2を構成するウェルドナット25が検出器本体1の絶縁体3の外方を囲むように同心状に配設されてスキンプレートPの裏面に固着されている。そして、検出器本体1を覆うように円筒状の抑え部材6が上記ウェルドナット25にねじ込まれており、抑え部材6の内周に形成した段付き面61によって、近接スイッチ4の中間ねじ部42に螺合させたナット部材11を介して絶縁体3の後端面が押圧され、絶縁体3が適当な力でスキンプレートPに圧接されて検出器本体1が固定される。
(Second Embodiment)
FIG. 5 shows another example of the fixing means 2. Here, the weld nuts 25 constituting the fixing means 2 are concentrically arranged so as to surround the outer side of the insulator 3 of the detector main body 1 and are fixed to the back surface of the skin plate P. Then, a cylindrical holding member 6 is screwed into the weld nut 25 so as to cover the detector main body 1, and an intermediate threaded portion 42 of the proximity switch 4 is provided by a stepped surface 61 formed on the inner circumference of the holding member 6. The rear end surface of the insulator 3 is pressed through the nut member 11 screwed into the insulator 3, and the insulator 3 is pressed against the skin plate P with an appropriate force to fix the detector main body 1.

(第3実施形態)
図6、図7に示す本実施形態では、検出器本体1を構成するキャップ5の形状が上記第1実施形態と異なり、これに応じて、キャップ5の周囲に設置される絶縁体3の形状も異なっている。他の構造は第1実施形態と同様であり、同一部分には同一符号を付してある。以下、第1実施形態との相違点を中心に説明する。
(Third Embodiment)
In the present embodiment shown in FIGS. 6 and 7, the shape of the cap 5 constituting the detector main body 1 is different from that of the first embodiment, and the shape of the insulator 3 installed around the cap 5 accordingly. Is also different. Other structures are the same as those in the first embodiment, and the same parts are designated by the same reference numerals. Hereinafter, the differences from the first embodiment will be mainly described.

図6、図7において、近接スイッチ4の先端検出部41に被せられる金属製のキャップ5には、その端壁51の中心部に小径の突出部511が形成されている。本実施形態ではこの突出部511は円柱状となっている。そして、キャップ5が被せられた上記先端検出部41を内部に受け入れる絶縁体3には、先端部31の中心に開口311が形成されて、キャップ5の上記突出部511が挿入できるようになっている。挿入された状態で突出部511の先端面は絶縁体先端部31の端面と同一面になる(図6)。 In FIGS. 6 and 7, the metal cap 5 that covers the tip detection portion 41 of the proximity switch 4 is formed with a small-diameter protrusion 511 at the center of the end wall 51. In the present embodiment, the protrusion 511 has a columnar shape. Then, an opening 311 is formed in the center of the tip portion 31 in the insulator 3 that receives the tip detection portion 41 covered with the cap 5 inside, so that the protrusion 511 of the cap 5 can be inserted. There is. In the inserted state, the tip surface of the protrusion 511 becomes the same surface as the end face of the insulator tip 31 (FIG. 6).

このような構造によると、充填空間Sへはキャップ5の端面中心部が突出部511によって露出するだけであるから、コンクリート検出器Dtを天端フォームFa(図1)に設けた場合等に、上方のトンネルT内壁から水滴が落下してもその影響を最小限にとどめて水滴の付着による誤作動を効果的に防止することができる。また、本構造では、絶縁体3内にキャップ5を挿入しさらにこれに近接スイッチ4の先端検出部41を挿入してスキンプレートPに押し付けるだけで全体を固定できるから、設置が容易であり加工の手間も少なくなるため第1実施形態の構造よりも安価に実現できる。なお、要は近接スイッチ4の先端検出部41端面を一部のみ充填空間Sへ露出させればよいのであるから、キャップ5の端壁中心部に突出部511を形成する構造はあくまでこれを実現する場合の一例を示すに過ぎない。 According to such a structure, since the central portion of the end face of the cap 5 is only exposed to the filling space S by the protruding portion 511, when the concrete detector Dt is provided on the top foam Fa (FIG. 1), etc. Even if water droplets fall from the inner wall of the tunnel T above, the influence thereof can be minimized and malfunction due to the adhesion of water droplets can be effectively prevented. Further, in this structure, the entire structure can be fixed by simply inserting the cap 5 into the insulator 3, further inserting the tip detection portion 41 of the proximity switch 4 and pressing it against the skin plate P, so that the installation is easy and processing is possible. It can be realized at a lower cost than the structure of the first embodiment because the labor of the above is reduced. In addition, since it is only necessary to expose only a part of the end face of the tip detection portion 41 of the proximity switch 4 to the filling space S, the structure of forming the protrusion 511 at the center of the end wall of the cap 5 only realizes this. It is just an example of the case.

(その他の実施形態)
近接スイッチ4の先端検出部41に金属製キャップ5を装着するのに代えて、先端検出部41の周面に金属箔を巻回して金属層とし、先端検出部41の端面には耐摩耗性のある樹脂板等を貼着する構造としても良い。また耐摩耗性が問題とならない場合には、先端検出部41の端面をそのまま充填空間Sに露出させるようにしても良い。また絶縁体3は必ずしも必要なものではなく、空気層であっても良い。なお、上記実施形態ではトンネルセントルにコンクリート検出器を設ける場合について説明したが、本発明の用途はこれに限られない。
(Other embodiments)
Instead of attaching the metal cap 5 to the tip detection portion 41 of the proximity switch 4, a metal foil is wound around the peripheral surface of the tip detection portion 41 to form a metal layer, and the end face of the tip detection portion 41 has abrasion resistance. A structure may be used in which a resin plate or the like is attached. If the wear resistance is not a problem, the end face of the tip detecting portion 41 may be exposed to the filling space S as it is. Further, the insulator 3 is not always necessary, and may be an air layer. In the above embodiment, the case where the concrete detector is provided in the tunnel center has been described, but the application of the present invention is not limited to this.

1…検出器本体、2…固定手段、3…絶縁体、4…近接スイッチ、41…先端検出部、5…キャップ、51…端壁、511…突出部(中心部)、52…キャップの周壁(金属層)、6…抑え部材、P…スキンプレート(枠板)、P1…検出開口、S…コンクリート充填空間。 1 ... Detector body, 2 ... Fixing means, 3 ... Insulator, 4 ... Proximity switch, 41 ... Tip detector, 5 ... Cap, 51 ... End wall, 511 ... Projection (center), 52 ... Cap peripheral wall (Metal layer), 6 ... Retaining member, P ... Skin plate (frame plate), P1 ... Detection opening, S ... Concrete filling space.

Claims (5)

静電容量形の棒状の近接スイッチと、コンクリート充填空間を形成する枠板に設けた検出開口内に、先端検出部が前記検出開口の内周面と間隔をおいた状態で前記近接スイッチを前記枠板に固定する固定手段とを備え、かつ、前記近接スイッチの先端検出部の周面を覆うように金属層が設けられているコンクリート検出器。 In the capacitance type rod-shaped proximity switch and the detection opening provided in the frame plate forming the concrete filling space, the proximity switch is placed in a state where the tip detection portion is spaced from the inner peripheral surface of the detection opening. A concrete detector provided with a fixing means for fixing to a frame plate and provided with a metal layer so as to cover the peripheral surface of the tip detection portion of the proximity switch. 前記金属層が、前記先端検出部の周面と端面を覆う金属製キャップの周壁によって構成されている請求項1に記載のコンクリート検出器。 The concrete detector according to claim 1, wherein the metal layer is composed of a peripheral surface of the tip detection portion and a peripheral wall of a metal cap covering the end surface. 前記金属製キャップの端面はその中心部のみがコンクリート充填空間へ露出している請求項2に記載のコンクリート検出器。 The concrete detector according to claim 2, wherein only the central portion of the end face of the metal cap is exposed to the concrete filling space. 前記近接スイッチの先端検出部周囲を覆うように前記検出開口内に前記間隔を確保する厚みを有して装着される筒状の絶縁体をさらに備える請求項1ないし3のいずれかに記載のコンクリート検出器。 The concrete according to any one of claims 1 to 3, further comprising a tubular insulator mounted in the detection opening with a thickness for ensuring the space so as to cover the periphery of the tip detection portion of the proximity switch. Detector. 前記固定手段は、前記近接スイッチの姿勢が目視できる状態で当該近接スイッチを固定するものである請求項1ないし4のいずれかに記載のコンクリート検出器。 The concrete detector according to any one of claims 1 to 4, wherein the fixing means fixes the proximity switch in a state where the posture of the proximity switch can be visually recognized.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63101823U (en) * 1986-12-23 1988-07-02
JPH062495A (en) * 1992-06-17 1994-01-11 Maeda Corp Vibration giving device for placed concrete
JPH0791050A (en) * 1993-09-27 1995-04-04 Gifu Kogyo Kk Movable form device for tunnel and form positioning method
JP2014077241A (en) * 2012-10-09 2014-05-01 Just Will Co Ltd Cast concrete strength management system
JP2018035632A (en) * 2016-09-02 2018-03-08 飛島建設株式会社 Center formwork device of tunnel lining, and lining placement system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63101823U (en) * 1986-12-23 1988-07-02
JPH062495A (en) * 1992-06-17 1994-01-11 Maeda Corp Vibration giving device for placed concrete
JPH0791050A (en) * 1993-09-27 1995-04-04 Gifu Kogyo Kk Movable form device for tunnel and form positioning method
JP2014077241A (en) * 2012-10-09 2014-05-01 Just Will Co Ltd Cast concrete strength management system
JP2018035632A (en) * 2016-09-02 2018-03-08 飛島建設株式会社 Center formwork device of tunnel lining, and lining placement system

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