JP2024011324A

JP2024011324A - load cell

Info

Publication number: JP2024011324A
Application number: JP2022113238A
Authority: JP
Inventors: 卓光峯尾; Takamitsu Mineo; 健次樋川; Kenji Toikawa; 幸彦片桐; Yukihiko Katagiri; 敏之小林; Toshiyuki Kobayashi; 尚明関口; Naoaki Sekiguchi; 正樹高原; Masaki Takahara
Original assignee: Toyoko Elmes Co Ltd; VSL Japan Corp
Current assignee: Toyoko Elmes Co Ltd; VSL Japan Corp
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2024-01-25

Abstract

An object of the present invention is to provide a load cell in which an anchor head does not shift.
[Solution]
It consists of a substantially cylindrical pressure receiving body and a substantially cylindrical anchor head guide provided on the outer periphery of the pressure receiving body and having an upper end surface located above the upper end surface of the pressure receiving body.
[Selection diagram] Figure 1

Description

本発明は、グラウンドアンカーに作用する引張力を計測する荷重計に関するものである。 The present invention relates to a load meter that measures tensile force acting on a ground anchor.

グラウンドアンカーは、地中に造成する定着部と地表付近に設ける法枠や擁壁等の構造物を高強度の引張材で連結し、引張材に作用させた引張力を利用して、構造物を安定させるシステムである。
従来知られているグラウンドアンカーは、地盤中に造成した定着部と構造物を、引張材１０１を介して連結する。そして、引張材１０１の頭部に設けたアンカーヘッド１０２とアンカープレート１０３からなる定着具を介して、構造物に形成した台座１０４から構造物に引張力を作用させる（図６）。 Ground anchors connect the anchorage built underground and structures such as legal frameworks and retaining walls near the ground surface using high-strength tensile material, and use the tensile force applied to the tensile material to anchor the structure. It is a system that stabilizes the
A conventionally known ground anchor connects an anchorage created in the ground and a structure via a tension member 101. Then, a tensile force is applied to the structure from a pedestal 104 formed on the structure via a fixing device consisting of an anchor head 102 and an anchor plate 103 provided on the head of the tensile member 101 (FIG. 6).

グラウンドアンカーに作用する引張力は、設置した地盤の変形や引張材等の経年劣化による低下が懸念される。このため、グラウンドアンカーに作用する引張力を計測することで、地盤の変形やグラウンドアンカーの健全性の指標とすることができる。
引張力の計測は、アンカーヘッド１０２とアンカープレート１０３の間に設ける荷重計１０５にかかる荷重を、荷重計１０５の内部に設けたひずみゲージにより計測することが一般的である。 There is concern that the tensile force acting on ground anchors may decrease due to deformation of the ground where they are installed and aging of the tensile materials. Therefore, by measuring the tensile force acting on the ground anchor, it can be used as an indicator of the deformation of the ground and the soundness of the ground anchor.
The tensile force is generally measured by measuring the load applied to the load cell 105 provided between the anchor head 102 and the anchor plate 103 using a strain gauge provided inside the load cell 105.

特公平３－２６３３８号公報Special Publication No. 3-26338

アンカーヘッド１０２とアンカープレート１０３の間に荷重計１０５を設けたとき、正確な引張力を計測するためには、アンカーヘッド１０２と荷重計１０５の軸心（中心）を合わせる必要がある。
従来のアンカーヘッド１０２と荷重計１０５は平面で接触しており、アンカーヘッド１０２施工時にアンカーヘッド１０２と荷重計１０５がずれるおそれがある。 When the load cell 105 is provided between the anchor head 102 and the anchor plate 103, it is necessary to align the axes (centers) of the anchor head 102 and the load cell 105 in order to accurately measure the tensile force.
Conventional anchor head 102 and load cell 105 are in plane contact, and there is a risk that anchor head 102 and load cell 105 may be misaligned during construction of anchor head 102.

本発明は、アンカーヘッドがずれることがない荷重計を提供することを目的とする。 An object of the present invention is to provide a load cell in which the anchor head does not shift.

上記目的を達成するためになされた本願の荷重計は、略円筒状の受圧体と、前記受圧体の外周に設ける、上端面が前記受圧体の上端面より上に位置する略円筒状のアンカーヘッドガイドと、からなる。
前記受圧体は、内面にセンサを貼付する円筒体と、前記円筒体の上部に設ける中空円板状の受圧カバーと、からなり、前記受圧カバーは、内周縁から下方に突出する内周筒を有してもよい。
対向する前記内周筒と前記円筒体の内周面との間にセンサ保護材を充填してもよい。
前記受圧体は、外周縁から下方に突出する外周筒を有し、前記外周筒は前記円筒体の外周に位置し、前記外周筒の外周面には周方向に連続する嵌合溝を有し、前記アンカーヘッドガイドの外周側から内周側に貫通して螺合する固定ボルトを有し、前記アンカーヘッドガイドを貫通した固定ボルトの先端が前記嵌合溝内に位置してもよい。
前記アンカーヘッドガイドは、一部を切り欠いて平面視略Ｃ字状を呈してもよい。 The load cell of the present application, which has been made to achieve the above object, includes a substantially cylindrical pressure receiving body, and a substantially cylindrical anchor provided on the outer periphery of the pressure receiving body, the upper end surface of which is located above the upper end surface of the pressure receiving body. Consisting of a head guide.
The pressure receiving body includes a cylindrical body to which a sensor is attached on the inner surface, and a hollow disc-shaped pressure receiving cover provided on the upper part of the cylindrical body. May have.
A sensor protection material may be filled between the opposing inner circumferential tube and the inner circumferential surface of the cylindrical body.
The pressure-receiving body has an outer cylinder protruding downward from the outer peripheral edge, the outer cylinder is located on the outer periphery of the cylindrical body, and the outer peripheral cylinder has a circumferentially continuous fitting groove on the outer peripheral surface. The anchor head guide may have a fixing bolt that penetrates from the outer circumferential side to the inner circumferential side of the anchor head guide and is screwed into the fixing bolt, and a tip of the fixing bolt that penetrates the anchor head guide may be located in the fitting groove.
The anchor head guide may be partially cut out to have a substantially C-shape in plan view.

本発明は、上記した課題を解決するための手段により、次のような効果の少なくとも一つを得ることができる。
（１）アンカーヘッドがアンカーヘッドガイドの内径に収まるため、アンカーヘッドと受圧体の軸心がずれることがなく、施工時の位置決めも容易である。
（２）嵌合溝は受圧カバーの外周筒に連続して設けてあるため、アンカーヘッドガイドの正確な位置決めをしなくても受圧体に固定することができる。
（３）アンカーヘッドガイドの切り欠きにケーブル引き出し部やケーブルが収まることで、アンカーヘッドガイドによりケーブル引き出し部やケーブルが保護される。 The present invention can obtain at least one of the following effects by means for solving the above problems.
(1) Since the anchor head fits within the inner diameter of the anchor head guide, the axes of the anchor head and pressure receiving body do not shift, and positioning during construction is easy.
(2) Since the fitting groove is provided continuously on the outer peripheral cylinder of the pressure receiving cover, the anchor head guide can be fixed to the pressure receiving body without accurate positioning.
(3) By fitting the cable pull-out part and the cable into the notch of the anchor head guide, the cable pull-out part and the cable are protected by the anchor head guide.

本発明の荷重計の斜視図A perspective view of a load cell of the present invention 図１のＡ－Ａ断面図AA sectional view in Figure 1 本発明の荷重計の分解斜視図Exploded perspective view of the load cell of the present invention 本発明の荷重計の平面図Plan view of the load cell of the present invention 本発明の荷重計を用いたグラウンドアンカーの説明図An explanatory diagram of a ground anchor using the load cell of the present invention 従来のグラウンドアンカーの説明図Illustration of conventional ground anchor

以下、図面を参照しながら本発明の荷重計を詳細に説明する。 Hereinafter, the load cell of the present invention will be explained in detail with reference to the drawings.

（１）荷重計の構成（図１～４）
本発明の荷重計は受圧体１の外周に、略円筒状のアンカーヘッドガイド２を設ける。 (1) Load cell configuration (Figures 1 to 4)
In the load cell of the present invention, a substantially cylindrical anchor head guide 2 is provided on the outer periphery of a pressure receiving body 1.

（２）受圧体
受圧体１は、円筒体１１と、円筒体１１の上部に被せる中空円板状の受圧カバー１２と、からなる
円筒体１１の内周面にはセンサ（ひずみゲージ）Ｓを設ける。
センサＳ用のケーブルは円筒体１１の側面に設けたケーブル引き出し部１１１から、本実施例においては上方に取り出す。
受圧カバー１２は中空円板状であり、内周縁から下方に突出する内周筒１２１と、外周縁から下方に突出する外周筒１２２を有する。また、受圧カバー１２の上面には、アンカーヘッド３の下面に接する受圧部１２３を有する。
受圧カバー１２を円筒体１１に被せたとき、内周筒１２１は円筒体１１の内周面と対向して所定の距離離れており、外周筒１２２は円筒体１１の外周に位置する。
外周筒１２２の外周には、連続する嵌合溝１２４を設ける。
受圧カバー１２は、外周から外周筒１２２を貫通し、円筒体１１に設けた雌ネジ状の固定ボルト孔１１２に螺合する受圧カバー固定ボルト１２５により固定する。受圧カバー固定ボルト１２５の頭部は嵌合溝１２４内に収める。
円筒体１１の内周面と対向する内周筒の外周面との間には、樹脂からなるセンサ保護材１３を充填する。 (2) Pressure receiving body The pressure receiving body 1 consists of a cylindrical body 11 and a hollow disk-shaped pressure receiving cover 12 that is placed over the top of the cylindrical body 11. A sensor (strain gauge) S is installed on the inner peripheral surface of the cylindrical body 11. establish.
In this embodiment, the cable for the sensor S is taken out upward from a cable pull-out section 111 provided on the side surface of the cylindrical body 11.
The pressure-receiving cover 12 has a hollow disk shape, and has an inner circumferential cylinder 121 that projects downward from the inner circumferential edge and an outer circumferential cylinder 122 that projects downward from the outer circumferential edge. Further, the upper surface of the pressure receiving cover 12 has a pressure receiving portion 123 that is in contact with the lower surface of the anchor head 3 .
When the pressure-receiving cover 12 is placed on the cylindrical body 11 , the inner circumferential tube 121 faces the inner circumferential surface of the cylindrical body 11 and is separated from it by a predetermined distance, and the outer circumferential tube 122 is located on the outer circumference of the cylindrical body 11 .
A continuous fitting groove 124 is provided on the outer periphery of the outer cylinder 122.
The pressure-receiving cover 12 is fixed by a pressure-receiving cover fixing bolt 125 that passes through the outer cylinder 122 from the outer periphery and is screwed into a female-threaded fixing bolt hole 112 provided in the cylindrical body 11 . The head of the pressure-receiving cover fixing bolt 125 is accommodated in the fitting groove 124.
A sensor protection material 13 made of resin is filled between the inner circumferential surface of the cylindrical body 11 and the outer circumferential surface of the opposing inner circumferential cylinder.

（３）アンカーヘッドガイド
アンカーヘッドガイド２は、略円筒状であり、受圧体１の外周に設ける。
アンカーヘッドガイド２の上端面は、受圧体１の受圧カバー１２の上端面より上に位置する。
アンカーヘッドガイド２は、外周に所定の間隔でボルト穴２１を設け、ボルト穴２１の底部に内周側に貫通するネジ孔２２を設け、ネジ孔２２に螺合してアンカーヘッドガイド２を貫通し、先端を受圧カバー１２の嵌合溝１２４に嵌合する固定ボルト２３により受圧体１に固定する。嵌合溝１２４は受圧カバー１２の外周筒１２２に連続して設けてあるため、アンカーヘッドガイド２の正確な位置決めをしなくても受圧体１に固定することができる。
また、本実施例においては、センサＳ用のケーブルをケーブル引き出し部１１１から上方に取り出すため、アンカーヘッドガイド２の一部に切り欠き２４を設けることにより、平面視略Ｃ字状を呈する。切り欠き２４にケーブル引き出し部１１１やケーブルが収まることで、アンカーヘッドガイド２によりケーブル引き出し部１１１やケーブルが保護される。 (3) Anchor head guide The anchor head guide 2 has a substantially cylindrical shape and is provided on the outer periphery of the pressure receiving body 1.
The upper end surface of the anchor head guide 2 is located above the upper end surface of the pressure receiving cover 12 of the pressure receiving body 1.
The anchor head guide 2 is provided with bolt holes 21 at predetermined intervals on the outer periphery, and screw holes 22 are provided at the bottoms of the bolt holes 21 that penetrate to the inner circumference side, and screw holes 22 are screwed into the screw holes 22 to penetrate the anchor head guide 2. Then, the tip is fixed to the pressure receiving body 1 with a fixing bolt 23 that fits into the fitting groove 124 of the pressure receiving cover 12. Since the fitting groove 124 is provided continuously on the outer peripheral cylinder 122 of the pressure receiving cover 12, the anchor head guide 2 can be fixed to the pressure receiving body 1 without accurate positioning.
Further, in this embodiment, in order to take out the cable for the sensor S upward from the cable pull-out portion 111, a notch 24 is provided in a part of the anchor head guide 2, so that the anchor head guide 2 has a substantially C-shape in plan view. By fitting the cable pull-out portion 111 and the cable into the notch 24, the cable pull-out portion 111 and the cable are protected by the anchor head guide 2.

（４）グラウンドアンカー
本発明の荷重計を用いたグラウンドアンカーは、荷重計にアンカー４を挿通し、楔５を介してアンカー４の上端を固定したアンカーヘッド３により受圧体１の上部を、アンカー４を挿通したアンカープレート６により下部を、それぞれ挟持する。アンカーヘッド３はアンカーヘッドガイド２の内周に収まる径とする。
そして、アンカーヘッド３からの軸力を受圧カバー１２の上面の受圧部１２３で受けて円筒体１１に伝達し、アンカープレート６からの反力を円筒体１１の下面により受けることで、発生する圧縮力をセンサＳにより計測する。
アンカーヘッド4がアンカーヘッドガイド2の内径に収まるため、アンカーヘッド4と受圧体1の軸心がずれることがなく、施工時の位置決めも容易である。
アンカーヘッド４には、本実施例の形状に限らず、従来のアンカー頭部の形状が採用できる。 (4) Ground anchor In the ground anchor using the load cell of the present invention, the anchor 4 is inserted into the load cell, and the upper part of the pressure receiving body 1 is fixed to the anchor head 3 with the upper end of the anchor 4 fixed through the wedge 5. The lower portions are each held between anchor plates 6 through which 4 is inserted. The anchor head 3 has a diameter that fits within the inner circumference of the anchor head guide 2.
Then, the axial force from the anchor head 3 is received by the pressure receiving part 123 on the upper surface of the pressure receiving cover 12 and transmitted to the cylindrical body 11, and the reaction force from the anchor plate 6 is received by the lower surface of the cylindrical body 11, resulting in compression. The force is measured by a sensor S.
Since the anchor head 4 fits within the inner diameter of the anchor head guide 2, the axes of the anchor head 4 and the pressure receiving body 1 do not shift, and positioning during construction is easy.
The anchor head 4 is not limited to the shape of this embodiment, but may be any conventional anchor head shape.

１受圧体、１１円筒体、１１１ケーブル引き出し部、１１２固定ボルト孔、１２受圧カバー、１２１内周筒、１２２外周筒、１２３受圧部、１２４嵌合溝、１２５固定ボルト、１３センサ保護材
２アンカーヘッドガイド、２１ボルト穴、２２ネジ孔、２３固定ボルト、２４切り欠き
３アンカーヘッド
４アンカー
５楔
６アンカープレート 1 Pressure receiving body, 11 Cylindrical body, 111 Cable extraction part, 112 Fixing bolt hole, 12 Pressure receiving cover, 121 Inner cylinder, 122 Outer cylinder, 123 Pressure receiving part, 124 Fitting groove, 125 Fixing bolt, 13 Sensor protection material 2 Anchor Head guide, 21 Bolt hole, 22 Screw hole, 23 Fixing bolt, 24 Notch 3 Anchor head 4 Anchor 5 Wedge 6 Anchor plate

Claims

a substantially cylindrical pressure receiving body;
a substantially cylindrical anchor head guide provided on the outer periphery of the pressure receiving body, the upper end surface of which is located above the upper end surface of the pressure receiving body;
A load cell consisting of.

The pressure receiving body includes a cylindrical body to which a sensor is attached on the inner surface, and a hollow disk-shaped pressure receiving cover provided on the top of the cylindrical body,
The pressure-receiving cover is characterized in that it has an inner circumferential cylinder that protrudes downward from the inner circumferential edge.
The load cell according to claim 1.

A sensor protection material is filled between the opposing inner circumferential tube and the inner circumferential surface of the cylindrical body,
The load cell according to claim 2.

The pressure receiving body has an outer circumferential cylinder protruding downward from the outer circumferential edge,
The outer peripheral cylinder is located on the outer periphery of the cylindrical body,
The outer circumferential cylinder has a circumferentially continuous fitting groove on the outer circumferential surface,
a fixing bolt that penetrates and screws into the anchor head guide from the outer circumferential side to the inner circumferential side;
The tip of the fixing bolt passing through the anchor head guide is located within the fitting groove.
The load cell according to claim 3.

The anchor head guide is characterized in that it has a substantially C-shape in plan view with a portion cut out.
The load cell according to claim 4.