JP2015152524A - Method and apparatus for measuring unevenness of structure - Google Patents

Method and apparatus for measuring unevenness of structure Download PDF

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JP2015152524A
JP2015152524A JP2014028669A JP2014028669A JP2015152524A JP 2015152524 A JP2015152524 A JP 2015152524A JP 2014028669 A JP2014028669 A JP 2014028669A JP 2014028669 A JP2014028669 A JP 2014028669A JP 2015152524 A JP2015152524 A JP 2015152524A
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measuring
inclined wall
wall surface
hardware
unevenness
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JP6280386B2 (en
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修 宮本
Osamu Miyamoto
修 宮本
宗司 塚崎
Soji Tsukazaki
宗司 塚崎
総太 宇都宮
Sota Utsunomiya
総太 宇都宮
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Hitachi Zosen Corp
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Abstract

PROBLEM TO BE SOLVED: To precisely measure unevenness of an inclined wall surface.SOLUTION: An unevenness measuring apparatus comprises a measuring hardware 11, an ultrasonic measuring instrument 4 movable along the measuring hardware 11, and a winch 3 provided on a workbench 1a positioned at a position of an inclined wall surface 1c above water so as to unreel the ultrasonic measuring instrument 4. The measuring hardware 11 is positioned so as to be equally distanced from the inclined wall surface 1c at an upper end 11b and a lower end 11c of the measuring hardware 11, and the ultrasonic measuring instrument 4 is then lowered along the measuring hardware 11 while a distance from the inclined wall surface 1c is measured in a direction perpendicular to the measuring hardware 11. Since the measuring instrument is moved along the measuring hardware positioned as to be equally distanced from the inclined wall surface at the upper end and the lower end, the measuring instrument is prevented from swaying or rotating during measurement. Furthermore, the position of the winch for lowering the measuring instrument need not be moved. Therefore, the measured value exactly indicates the amount of unevenness, which allows precise measurement.

Description

本発明は、例えばダム堰体のように水中に設けられた構造物の傾斜壁面の不陸量を計測する方法、及びこの方法を実施するために使用する装置に関するものである。   The present invention relates to a method for measuring the amount of unevenness of an inclined wall surface of a structure provided in water, such as a dam weir body, and an apparatus used for carrying out this method.

例えば、ダム施設の改良工事を行う際に、ダム堰体と貯水池を分離するためにダム堰体に水中仮締切り設備を設置する。   For example, when a dam facility is improved, an underwater provisional cutoff facility is installed in the dam weir to separate the dam weir from the reservoir.

この水中仮締切り設備の設置に際し、ダム堰体の貯水池側の傾斜壁面の不陸を計測した結果に基づき、水中仮締切り設備の水密金物の端面を、傾斜壁面との距離が所定の範囲となるように切断する（特許文献１の段落００２０、００２１参照）。   When installing this underwater temporary cutoff facility, the distance between the end surface of the watertight hardware of the underwater temporary cutoff facility and the inclined wall surface is within a predetermined range based on the result of measuring the unevenness of the inclined wall on the reservoir side of the dam weir. (See paragraphs 0020 and 0021 of Patent Document 1).

このような水中仮締切り設備の設置に際して実施する傾斜壁面の不陸の計測は、従来、以下のような手順で行っていた。   Conventionally, the measurement of the unevenness of the inclined wall surface performed when installing such an underwater provisional cutoff facility has been performed by the following procedure.

まず、ダム堰体１の最下部である台座コンクリート面１ｂに事前に設置した基準点Ｂをもとにして、ダム堰体１に固定した水面上の作業台１ａの上の測量基準点Ａを割り出しておく。そして、これら基準点Ｂと測量基準点Ａの間の傾斜壁面１ｃに、レベルマークワイヤー２を高さ方向に等間隔に設置する（図３（ａ））。   First, based on the reference point B set in advance on the pedestal concrete surface 1b, which is the lowest part of the dam weir body 1, the surveying reference point A on the work table 1a on the water surface fixed to the dam weir body 1 is set. Find out. And the level mark wire 2 is installed in the height direction at equal intervals on the inclined wall surface 1c between these reference points B and surveying reference points A (FIG. 3A).

前記レベルマークワイヤー２を設置することで、傾斜壁面１ｃの不陸の計測時、後述する超音波計測器４が通過したことを記録紙の計測データ上に明確に明示することができる。   By installing the level mark wire 2, it is possible to clearly indicate on the measurement data of the recording paper that the ultrasonic measuring instrument 4 described later has passed when measuring the unevenness of the inclined wall surface 1c.

次に、作業台１ａに設置したウインチ３のドラムを巻き戻して、ウインチ３のワイヤロープ３ａの端部に取り付けた超音波計測器４を鉛直下方に降下させ、この降下中に超音波計測器４と傾斜壁面１ｃとの距離を計測する。   Next, the drum of the winch 3 installed on the workbench 1a is rewound, and the ultrasonic measuring instrument 4 attached to the end of the wire rope 3a of the winch 3 is lowered vertically, and the ultrasonic measuring instrument is lowered during the lowering. The distance between 4 and the inclined wall surface 1c is measured.

一定の深度まで計測した後は、超音波計測器４が傾斜壁面１ｃに当接する前に、ウインチ３を傾斜壁面１ｃから離れる方向に移動させ、再度、超音波計測器４を鉛直下方に降下させて超音波計測器４と傾斜壁面１ｃとの距離を計測する作業を継続する（図３（ｂ））。   After measuring to a certain depth, before the ultrasonic measuring instrument 4 comes into contact with the inclined wall surface 1c, the winch 3 is moved away from the inclined wall surface 1c, and the ultrasonic measuring instrument 4 is lowered vertically again again. Then, the operation of measuring the distance between the ultrasonic measuring instrument 4 and the inclined wall surface 1c is continued (FIG. 3B).

以上の計測を、超音波計測器４が台座コンクリート面１ｂに至るまで繰り返すことで、ダム堤体１の貯水池側の傾斜壁面１ｃの不陸を計測する。   By repeating the above measurement until the ultrasonic measuring instrument 4 reaches the pedestal concrete surface 1b, the unevenness of the inclined wall surface 1c on the reservoir side of the dam body 1 is measured.

しかしながら、上記の計測方法は、超音波計測器が水中を鉛直下方に移動するので、移動中に超音波計測器が揺れたり回転したりすることになって、計測した不陸量の計測精度が悪くなる。加えて、レベルマークワイヤーの設置は潜水士による人為的作業によって行われるので、緊張状態に設置することが難しく、この点も計測精度が悪化する原因となる。   However, in the above measurement method, since the ultrasonic measuring instrument moves vertically downward in the water, the ultrasonic measuring instrument shakes or rotates during the movement, and the measurement accuracy of the measured unevenness amount is low. Deteriorate. In addition, since the level mark wire is installed by a human work by a diver, it is difficult to install it in a tension state, and this also causes the measurement accuracy to deteriorate.

また、超音波計測器を降下移動させるウインチの設置位置を移動させる必要があるため、ウインチの移動による誤差が積算され、かつ計測に要する時間も長くなる。   In addition, since it is necessary to move the installation position of the winch for moving the ultrasonic measuring device downward, errors due to the movement of the winch are integrated, and the time required for measurement is increased.

特許第３４５５０８１号公報Japanese Patent No. 3455081

本発明が解決しようとする問題点は、従来の不陸計測では、超音波計測器が水中を鉛直下方に移動中に揺れたり回転したりすることになって、計測した不陸量の計測精度が悪くなるという点である。加えて、レベルマークワイヤーを緊張状態に設置することが難しく、この点も計測精度が悪化する原因となるという点である。   The problem to be solved by the present invention is that, in the conventional unevenness measurement, the ultrasonic measuring instrument shakes and rotates while moving vertically downward in the water, and the measurement accuracy of the measured unevenness amount Is that it gets worse. In addition, it is difficult to install the level mark wire in a tensioned state, which also causes the measurement accuracy to deteriorate.

本発明は、上記問題を解決するために、傾斜壁面の不陸の計測を精度よく行うようにすることを目的としてなされたものである。   In order to solve the above problems, the present invention has been made for the purpose of accurately measuring the unevenness of an inclined wall surface.

本発明は、
構造物の傾斜壁面の不陸量を計測する方法であって、
計測用金物を、計測用金物の上端部と下端部における前記傾斜壁面との距離が同程度になるように設置した後、
この計測用金物に沿って計測器を降下させながら、計測用金物と傾斜壁面との計測用金物から直角方向の距離を測定することを最も主要な特徴としている。 The present invention
A method for measuring the unevenness of an inclined wall of a structure,
After installing the measurement hardware, so that the distance between the inclined wall surface at the upper end and the lower end of the measurement hardware is the same,
The most important feature is to measure the distance between the measuring hardware and the inclined wall surface in the direction perpendicular to the measuring hardware while lowering the measuring instrument along the measuring hardware.

上記本発明の構造物の不陸計測方法は、
上端部と下端部における前記構造物の傾斜壁面との距離が同程度になるように設置する計測用金物と、
この計測用金物に沿って移動可能な計測器と、
この計測器を繰り出すべく、前記傾斜壁面の水面上の位置に設置された作業台に設けられる繰り出し装置と、
を備えたことを最も主要な特徴とする本発明の構造物の不陸計測装置を使用して行う。 The unevenness measuring method of the structure of the present invention is as follows.
A measuring hardware installed so that the distance between the upper end and the inclined wall surface of the structure at the lower end is approximately the same;
A measuring instrument movable along the measuring hardware,
In order to feed out this measuring instrument, a feeding device provided on a work table installed at a position on the water surface of the inclined wall surface,
It is performed using the unevenness measuring apparatus of the structure of the present invention, which is the most main feature.

上記の本発明では、上端部と下端部における傾斜壁面との距離が同程度になるように設置する計測用金物に沿って計測器を移動させるので、計測中に計測器が揺れたり回転したりすることがなく、計測した値がそのまま不陸量となって、高精度な計測が可能になる。   In the present invention described above, since the measuring instrument is moved along the measuring hardware installed so that the distance between the upper end portion and the inclined wall surface at the lower end portion is approximately the same, the measuring instrument may shake or rotate during measurement. Therefore, the measured value becomes the unlanding amount as it is, and high-precision measurement becomes possible.

上記本発明の構造物の不陸計測装置を構成する計測用金物の、傾斜壁面側の前記計測器の計測範囲に、予め遮蔽物を高さ方向に等間隔で設けた場合は、計測器で遮蔽物を計測した際にはエラー値を精度よく計測できるので、当該計測位置を特定することができる。従って、不陸の計測位置と構造物の高さの関係を明確にすることができる。   When a shielding object is previously provided at equal intervals in the height direction in the measuring range of the measuring instrument on the inclined wall side of the measuring hardware constituting the unevenness measuring apparatus for a structure of the present invention, the measuring instrument Since the error value can be accurately measured when the shielding object is measured, the measurement position can be specified. Therefore, it is possible to clarify the relationship between the uneven measurement position and the height of the structure.

本発明では、上端部と下端部における傾斜壁面との距離が同程度になるように設置する計測用金物に沿って計測器を移動させるので、計測中に計測器が揺れたり回転したりしない。また、計測器を降下移動させる繰り出し装置の設置位置を移動させる必要がない。従って、傾斜斜面の不陸量を高精度に計測することが可能になる。   In the present invention, the measuring instrument is moved along the measuring hardware installed so that the distance between the upper end portion and the inclined wall surface at the lower end portion is approximately the same, so that the measuring instrument does not shake or rotate during measurement. Further, it is not necessary to move the installation position of the feeding device that moves the measuring device downward. Therefore, it is possible to measure the unevenness of the inclined slope with high accuracy.

（ａ）〜（ｃ）は本発明の不陸計測装置を構成する計測用金物の組み立て及び構造物の傾斜壁面への設置方法を、順を追って説明する図である。(A)-(c) is a figure explaining the assembly method of the hardware for a measurement which comprises the unevenness measuring apparatus of this invention, and the installation method to the inclined wall surface of a structure later on. 本発明の不陸計測装置を用いた本発明の不陸計測方法の一例を説明する図である。It is a figure explaining an example of the unevenness measuring method of the present invention using the unevenness measuring device of the present invention. （ａ）（ｂ）従来の不陸計測方法を、順を追って説明する図である。(A) (b) It is a figure explaining the conventional unevenness measuring method later on.

本発明は、傾斜壁面の不陸の計測を精度よく行えるようにするという目的を、上端部と下端部の傾斜壁面との距離が同程度になるように設置した計測用金物に沿って計測器を降下させながら傾斜壁面との距離を測定することで実現した。   The purpose of the present invention is to provide a measuring instrument along a measuring hardware installed so that the distance between the inclined wall surface of the upper end and the lower end portion is the same for the purpose of accurately measuring the unevenness of the inclined wall surface. This was realized by measuring the distance to the inclined wall surface while lowering.

以下、本発明を実施するための形態を、図１及び図２を用いて詳細に説明する。
図１は本発明の不陸計測装置を構成する計測用金物の組み立て及び構造物の傾斜壁面への設置方法を、図２は発明の不陸計測装置を用いた本発明の不陸計測方法の一例を説明する図である。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS. 1 and 2.
FIG. 1 shows a method of assembling a measuring hardware constituting the unevenness measuring apparatus of the present invention and a method of installing the structure on an inclined wall surface, and FIG. 2 shows an unevenness measuring method of the present invention using the unevenness measuring apparatus of the present invention. It is a figure explaining an example.

図１において、１１ａは、４本の長弦材を斜材と垂直材で三角形を形成するようにピン連結した、適宜の長さのトラス構造物であり（図１（ａ））、傾斜壁面１ｃと相対する面は所定の真直度に形成されている。また、本発明では、傾斜壁面１ｃと相対する位置の長弦材に、超音波計測器４の案内レール１２を取付けている。   In FIG. 1, 11a is a truss structure of an appropriate length in which four long chord members are pin-connected so as to form a triangle with diagonal members and vertical members (FIG. 1 (a)), and an inclined wall surface. The surface facing 1c is formed with a predetermined straightness. Moreover, in this invention, the guide rail 12 of the ultrasonic measuring device 4 is attached to the long chord material of the position facing the inclined wall surface 1c.

本発明の不陸計測装置を構成する計測用金物１１は、前記トラス構造物１１ａを例えば７ブロック連結したもので、ダム堰体１の天端１ｄに設置したクレーン５を用いてダム堰体１の貯水池側に吊降ろしつつ、水面上で連結して組み立てる（図１（ｂ））。   A measuring hardware 11 constituting the unevenness measuring apparatus of the present invention is a structure in which, for example, seven blocks of the truss structure 11a are connected, and a dam weir body 1 using a crane 5 installed at the top end 1d of the dam weir body 1. As shown in Fig. 1 (b), it is connected to the water surface while being suspended on the reservoir side.

前記組み立てた計測用金物１１は、ダム堰体１の最下部である台座コンクリート面１ｂに事前に設置した基準点Ｂをもとにして、ダム堰体１に固定した水面上の作業台１ａの上の測量基準点Ａを割り出し、測量基準点Ａからの取り付け位置を確認しながら傾斜壁面１ｃに取付ける（図１（ｃ））。つまり、計測用金物１１は作業台１ａに取付けるのではなくて傾斜壁面１ｃに取付けるので、作業台１ａと計測用金物１１は互いに独立している。   The assembled measurement hardware 11 is formed on the work table 1a on the water surface fixed to the dam weir 1 based on the reference point B set in advance on the pedestal concrete surface 1b which is the lowermost part of the dam weir 1. The upper surveying reference point A is determined and attached to the inclined wall surface 1c while confirming the attachment position from the surveying reference point A (FIG. 1 (c)). That is, since the measurement hardware 11 is not attached to the work table 1a but is attached to the inclined wall surface 1c, the work table 1a and the measurement hardware 11 are independent of each other.

この取付けに際し、本発明では、計測用金物１１の上端部１１ｂ及び下端部１１ｃと、前記傾斜壁面１ｃとの距離がほぼ同じになるようにしている。従って、計測用金物１１に取付けた案内レール１２と傾斜壁面１ｃとの案内レール１２から直角方向の距離が、計測用金物１１の上端部１１ｂと下端部１１ｃでほぼ同じになる。さらに、測量基準点Ａと上端部１１ｂの距離を実測することにより、測量基準点Ａと上端部１１ｂとの傾斜壁面１ｃに沿った方向の距離の差を割出しておく。   At the time of attachment, according to the present invention, the distance between the upper end portion 11b and the lower end portion 11c of the measuring hardware 11 and the inclined wall surface 1c is made substantially the same. Accordingly, the distance between the guide rail 12 attached to the measurement hardware 11 and the inclined wall surface 1c in the direction perpendicular to the guide rail 12 is substantially the same at the upper end portion 11b and the lower end portion 11c of the measurement hardware 11. Further, by measuring the distance between the surveying reference point A and the upper end portion 11b, the difference in the distance along the inclined wall surface 1c between the surveying reference point A and the upper end portion 11b is calculated.

次に、図２に示すように、作業台１ａ上に設置した繰り出し装置、例えばウインチ３のワイヤロープ３ａを巻き戻して、ワイヤロープ３ａの先端に取り付けた超音波計測器４を上端部１１ｂから案内レール１２に沿って下端部１１ｃまで降下させる。   Next, as shown in FIG. 2, an unwinding device installed on the work table 1a, for example, the wire rope 3a of the winch 3 is rewound, and the ultrasonic measuring instrument 4 attached to the tip of the wire rope 3a is removed from the upper end portion 11b. It is lowered along the guide rail 12 to the lower end portion 11c.

そして、この降下中に傾斜壁面１ｃとの計測用金物１１から直角方向の距離を計測し、傾斜壁面１ｃの不陸の計測を行う。この不陸の計測において、高さ方向の位置は、ウインチ３のワイヤロープ３ａの巻き戻し量によって特定できる。なお、ワイヤロープ３ａの巻き戻し量は、エンコーダの使用や、ワイヤロープ３ａの長さを予め測定しておくことによって計測できる。   During this descent, the distance in the direction perpendicular to the measuring hardware 11 with respect to the inclined wall surface 1c is measured, and the unevenness of the inclined wall surface 1c is measured. In this measurement of unevenness, the position in the height direction can be specified by the amount of rewinding of the wire rope 3a of the winch 3. The unwinding amount of the wire rope 3a can be measured by using an encoder or measuring the length of the wire rope 3a in advance.

上記傾斜壁面１ｃの不陸の計測方法によれば、計測中に超音波計測器４が揺れたり回転したりすることがなく、また、ウインチ３の設置位置を移動させる必要がないので、計測した値がそのまま不陸量となって、従来のcm単位の精度に対してmm単位の精度で計測できるようになる。   According to the method for measuring the unevenness of the inclined wall 1c, the ultrasonic measuring instrument 4 does not shake or rotate during measurement, and it is not necessary to move the installation position of the winch 3, The value becomes the unlanding amount as it is, and it becomes possible to measure with the accuracy of mm unit compared to the conventional accuracy of cm unit.

上記傾斜壁面１ｃの不陸の計測に際し、図２に示すように、計測用金物１１の、傾斜壁面１ｃ側の超音波計測器４の計測範囲に、例えば鋼管のような遮蔽物１３を予め高さ方向に等間隔で設けておけば、超音波計測器４で遮蔽物１３を計測した際にはエラー値を精度よく計測できる。前記遮蔽物１３は計測用金物１１の組み立て時に、各ブロックに取付けられている。   When measuring the unevenness of the inclined wall surface 1c, as shown in FIG. 2, a shielding object 13 such as a steel pipe is preliminarily placed in the measurement range of the ultrasonic measuring instrument 4 on the inclined wall surface 1c side of the measurement hardware 11. If the shielding object 13 is measured by the ultrasonic measuring instrument 4, the error value can be measured with high accuracy by providing it at equal intervals in the vertical direction. The shield 13 is attached to each block when the measuring hardware 11 is assembled.

従って、遮蔽物１３の計測位置を特定できて、水中であっても、不陸の計測位置と傾斜壁面１ｃの高さの関係を明確にすることができ、高精度な計測値のデータ化が行えるようになる。   Therefore, the measurement position of the shielding object 13 can be specified, and even in the water, the relationship between the non-land measurement position and the height of the inclined wall surface 1c can be clarified, and high-precision measurement value data can be converted into data. You can do it.

本発明は、前記の例に限るものではなく、各請求項に記載の技術的思想の範疇であれば、適宜実施の形態を変更しても良いことは言うまでもない。   The present invention is not limited to the above examples, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

例えば、上記実施例では、傾斜壁面１ｃとの計測用金物１１から直角方向の距離を測定する計測器として超音波計測器４を示したが、水中で距離を測定できるものであれば、超音波計測器４でなくてもよい。   For example, in the above-described embodiment, the ultrasonic measuring instrument 4 is shown as a measuring instrument that measures the distance in the perpendicular direction from the measuring hardware 11 to the inclined wall surface 1c. However, if the distance can be measured in water, The measuring instrument 4 may not be used.

また、上記実施例では、超音波計測器４の計測範囲に設置する遮蔽物１３として鋼管を示したが、超音波計測器４で計測した際にエラー値が計測できるものであれば鋼管でなくてもよい。   Moreover, in the said Example, although the steel pipe was shown as the shielding object 13 installed in the measurement range of the ultrasonic measuring instrument 4, if it can measure an error value when measuring with the ultrasonic measuring instrument 4, it is not a steel pipe. May be.

また、上記実施例では、超音波計測器４の繰り出し装置としてウインチ３を示したが、超音波計測器４を繰り出すことができ、かつその繰り出し量を特定できるものであれば、ウインチ３に限らない。   Moreover, in the said Example, although the winch 3 was shown as an extending | stretching apparatus of the ultrasonic measuring device 4, if the ultrasonic measuring device 4 can be extended and the amount of feeding can be specified, it will be restricted to the winch 3. Absent.

１ ダム堰体
１ａ 作業台
１ｂ 台座コンクリート面
１ｃ 傾斜壁面
３ ウインチ
４ 超音波計測器
１１ 計測用金物
１１ｂ 上端部
１１ｃ 下端部
１２ 案内レール
１３ 遮蔽物 DESCRIPTION OF SYMBOLS 1 Dam dam body 1a Worktable 1b Base concrete surface 1c Inclined wall surface 3 Winch 4 Ultrasonic measuring instrument 11 Measuring hardware 11b Upper end part 11c Lower end part 12 Guide rail 13 Shielding object

Claims (3)

構造物の傾斜壁面の不陸量を計測する方法であって、
計測用金物を、計測用金物の上端部と下端部における前記傾斜壁面との距離が同程度になるように設置した後、
この計測用金物に沿って計測器を降下させながら、計測用金物と傾斜壁面との計測用金物から直角方向の距離を測定することを特徴とする構造物の不陸計測方法。 A method for measuring the unevenness of an inclined wall of a structure,
After installing the measurement hardware, so that the distance between the inclined wall surface at the upper end and the lower end of the measurement hardware is the same,
A method for measuring the unevenness of a structure, wherein the distance between the measuring hardware and the inclined wall surface is measured in a direction perpendicular to the measuring hardware while the measuring instrument is lowered along the measuring hardware. 構造物の傾斜壁面の不陸量を計測する装置であって、
上端部と下端部における前記傾斜壁面との距離が同程度になるように設置する計測用金物と、
この計測用金物に沿って移動可能な計測器と、
この計測器を繰り出すべく、前記傾斜壁面の水面上の位置に設置された作業台に設けられる繰り出し装置と、
を備えたことを特徴とする構造物の不陸計測装置。 A device for measuring the unevenness of the inclined wall surface of a structure,
A measuring hardware to be installed so that the distance between the inclined wall surface at the upper end and the lower end is approximately the same;
A measuring instrument movable along the measuring hardware,
In order to feed out this measuring instrument, a feeding device provided on a work table installed at a position on the water surface of the inclined wall surface,
A structure unevenness measuring device characterized by comprising: 前記計測用金物の、傾斜壁面側の前記計測器の計測範囲に、遮蔽物を高さ方向に等間隔で設けたことを特徴とする請求項２に記載の構造物の不陸計測装置。   The structure according to claim 2, wherein shielding objects are provided at equal intervals in the height direction in a measurement range of the measuring instrument on the inclined wall surface side of the measurement hardware.
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Publication number Priority date Publication date Assignee Title
CN110836651A (en) * 2019-10-29 2020-02-25 清华大学 Landslide flexibility monitoring device and method thereof

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JPS60210707A (en) * 1984-04-03 1985-10-23 Kaiyo Kagaku Gijutsu Center Measuring apparatus for thickness of layer of underwater product
JPH11304457A (en) * 1998-04-24 1999-11-05 Toda Constr Co Ltd Excavated wall measuring device
US20050005687A1 (en) * 2003-07-08 2005-01-13 Mccrea Keith A. Roll contour measuring apparatus and method
JP2012247346A (en) * 2011-05-30 2012-12-13 Jfe Steel Corp Length measuring method and apparatus for long material

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS60210707A (en) * 1984-04-03 1985-10-23 Kaiyo Kagaku Gijutsu Center Measuring apparatus for thickness of layer of underwater product
JPH11304457A (en) * 1998-04-24 1999-11-05 Toda Constr Co Ltd Excavated wall measuring device
US20050005687A1 (en) * 2003-07-08 2005-01-13 Mccrea Keith A. Roll contour measuring apparatus and method
JP2012247346A (en) * 2011-05-30 2012-12-13 Jfe Steel Corp Length measuring method and apparatus for long material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110836651A (en) * 2019-10-29 2020-02-25 清华大学 Landslide flexibility monitoring device and method thereof

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