JPH0532717B2 - - Google Patents
Info
- Publication number
- JPH0532717B2 JPH0532717B2 JP62212370A JP21237087A JPH0532717B2 JP H0532717 B2 JPH0532717 B2 JP H0532717B2 JP 62212370 A JP62212370 A JP 62212370A JP 21237087 A JP21237087 A JP 21237087A JP H0532717 B2 JPH0532717 B2 JP H0532717B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- concrete
- magnetic
- steel material
- prestressed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 239000000463 material Substances 0.000 claims description 28
- 239000004567 concrete Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 239000011513 prestressed concrete Substances 0.000 description 32
- 230000003014 reinforcing effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、PC（プレストレスコンクリート）構
造物で、コンクリート内に埋設されたPC鋼材の
配役場所を探知する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the placement location of prestressed steel members buried in concrete in a prestressed concrete (PC) structure.
アンボンドPC鋼材を用いたフラツトスラブ工
法などを初めとするプレストレスコンクリート工
法は周知の技術であるが、一旦コンクリート内に
打込まれたPC鋼材は、打込み後はコンクリート
に覆われてしまうためにその配置場所を探知する
のが困難で、このため、打込み後に釘打ち、アン
カーの穴あけ、開口部の切断などを行う際、誤つ
てPC鋼材を破損するおそれがあり、その結果、
コンクリートに充分なプレストレスを与えること
ができなくなつてひび割れ等の事故発生するおそ
れがある。
Prestressed concrete construction methods such as the flat slab method using unbonded prestressed steel are well-known technologies, but once the prestressed prestressed steel is placed in concrete, it is covered with concrete, so the placement of prestressed concrete is difficult. It is difficult to detect the location, and as a result, there is a risk of accidentally damaging the prestressing steel when driving nails, drilling anchors, cutting openings, etc. after driving.
There is a risk that accidents such as cracks may occur because sufficient prestress cannot be applied to the concrete.
前記不都合を解消すべく、金属探知器を用いて
PC鋼材の配設場所を探知する方法も考えられる。
例えば、コンクリート中の鉄筋の位置検知にはこ
の金属探知器が用いられることがある。
In order to eliminate the above-mentioned inconvenience, using a metal detector
A method of detecting the location of PC steel materials may also be considered.
For example, this metal detector is sometimes used to detect the location of reinforcing bars in concrete.
かかる金属探知器を用いる方法では、鉄筋も
PC鋼材と同様に探知されるので探知されたもの
が鉄筋であるのか、PC鋼材であるのかその区別
がつかず、PC鋼材の探知方法として採用するこ
とはできない。 This method using a metal detector also detects reinforcing steel.
Since it is detected in the same way as prestressing steel, it is not possible to distinguish whether the detected object is reinforcing steel or prestressing steel, so it cannot be used as a detection method for prestressing steel.
また、他の方法としてPC鋼材を配役した場所
のコンクリート表面にマーカーを施しておくこと
も考えられるが、コンクリート面上を仕上材等で
覆うとこれによりマーカーが隠蔽され、その結
果、マーカーの位置が不明となつてPC網材の位
置を探知できなくなつてしまう。 Another method is to place markers on the concrete surface where the prestressing steel is placed, but if the concrete surface is covered with a finishing material, the markers will be hidden, and as a result, the marker's position will be reduced. becomes unknown, making it impossible to detect the position of the PC net material.
これに対して、地下埋設物の探知として特開昭
56−46480号公報で示されるように、磁気フエラ
イトを地下埋設物の上部に配置して、この磁気フ
エライトを標識として検知を行うシステムが開示
されている。 On the other hand, the Japanese Patent Application Publication No.
As shown in Japanese Patent No. 56-46480, a system is disclosed in which magnetic ferrite is placed above an underground object and the magnetic ferrite is used as a marker for detection.
しかし、この磁気フエライトによる標識システ
ムは、地下埋設物の上方に磁性体（フエライト）
を別途設置する必要があり、しかも確実に埋設物
の上部に設置しなければ意味がないので、この磁
性体の設置段階において熕雑さがあり、工程時間
をかなり必要とする。 However, this marking system using magnetic ferrite does not allow magnetic material (ferrite) to be placed above underground objects.
It is necessary to separately install the magnetic material, and since it is meaningless unless it is reliably installed on top of the buried object, the installation stage of this magnetic material is complicated and requires a considerable amount of process time.
また、実際の検知段階では、磁界発生コイルに
交流電流を流して交流磁界を発生させてこの交流
磁界を検知するので、複雑な検知装置が必要とな
る。 Furthermore, in the actual detection stage, an alternating current is passed through a magnetic field generating coil to generate an alternating magnetic field, and this alternating magnetic field is detected, so a complicated detection device is required.
また、特開昭61−16560号広報では、内部永久
磁石をパイプ内で移動可能な電力ケーブルコア上
部の一定個所に取付け、そのパイプ外側に外部永
久磁石を近づけて両磁石相互の磁力線の位置変化
によりケーブルの位置を測定する方法が開示され
ている。 In addition, in JP-A No. 61-16560, an internal permanent magnet is attached to a fixed location on the upper part of a power cable core that is movable within a pipe, and an external permanent magnet is brought close to the outside of the pipe to change the position of the magnetic lines of force between the two magnets. discloses a method for measuring the position of a cable.
しかし、この方法では前回計測した位置を予測
しており、そこからの変化を検知するものである
から、はじめからどこに埋設したのか見当がつか
ないものには利用できない。 However, this method predicts the previously measured position and detects changes from there, so it cannot be used for items where there is no idea where it was buried from the beginning.
また、長尺なケーブルの一定個所にのみ設置さ
れたものなので、ケーブルがどの向きにのびてい
るのかまでは計測できないものである。 Furthermore, since it is installed only at certain points on a long cable, it is not possible to measure the direction in which the cable is extending.
さらに、磁界空間を垂直方向に一致するように
外部永久磁石を移動させるのが、このとき横向き
となつている磁界センサを見ながら移動させるの
で、実際に計測する作業員は無理な姿勢をとらな
ければならない。 Furthermore, when moving the external permanent magnet so that the magnetic field space coincides with the vertical direction, the operator must take an awkward posture as he or she must move the external permanent magnet while looking at the magnetic field sensor, which is oriented horizontally. Must be.
本発明の目的は前記従来例の不都合を解消し、
コンクリート中のPC鋼材に簡単に設置でき、し
かもこの長尺なPC鋼材のみを鉄筋などの他の金
属材とは区別して簡単かつ確実に探知できるPC
鋼材の探知方法を提供することにある。 The purpose of the present invention is to eliminate the disadvantages of the conventional example,
A PC that can be easily installed on prestressed steel materials in concrete, and can easily and reliably detect only long prestressed steel materials, distinguishing them from other metal materials such as reinforcing bars.
The purpose of this invention is to provide a method for detecting steel materials.
本発明は前記目的を達成するため、偏平簿物の
磁石をPC鋼材の長さ方向に沿つて一定間隔で該
PC鋼材の上周面を覆うように配設し、このPC鋼
材をコンクリート内に打込んだ後、磁気検知器を
用いてコンクリート外面から前記PC鋼材に配設
した磁石による磁力を検知することを要旨とする
ものである。
In order to achieve the above object, the present invention applies magnets of flat books at regular intervals along the length direction of PC steel material.
After the PC steel material is placed so as to cover the upper peripheral surface of the prestressed steel material and the prestressed steel material is placed in concrete, a magnetic detector is used to detect the magnetic force generated by the magnet placed on the prestressed steel material from the outer surface of the concrete. This is a summary.
本発明によれば、PC鋼材に配設する磁石は偏
平簿物の磁石なので、鋼材の周面に被せるだけで
簡単に取付けることができる。
According to the present invention, since the magnet disposed on the PC steel material is a flat book magnet, it can be easily attached by simply placing it over the circumferential surface of the steel material.
また、磁力がPC鋼材の長さ方向に一定間隔で
配設されているので、打込み後、磁気探知器を用
いて探知することにより、磁力を他の鉄筋とは区
別して磁力が付されているPC鋼材の配設状態を
確実に検知できる。 In addition, since the magnetic force is arranged at regular intervals in the length direction of the prestressing steel, after driving, by detecting it using a magnetic detector, the magnetic force can be distinguished from other reinforcing bars. The installation status of PC steel materials can be detected reliably.
〔実施例〕
以下、図面について本発明の実施例を詳細に説
明する。[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明の探知方法で使用するPC鋼材
のうち単一のPC鋼線を示す斜視図、第２図は同
上７本よりPC鋼線の斜視図で、いずれの場合も
PC鋼線１の長さ方向に沿つてその外面に連続的
に又は一定間隔で偏平簿物の磁石２を直結貼付し
ておく。 Figure 1 is a perspective view showing a single PC steel wire among the PC steel materials used in the detection method of the present invention, and Figure 2 is a perspective view of the same seven PC steel wires.
Flat book magnets 2 are directly attached to the outer surface of the PC steel wire 1 along its length, either continuously or at regular intervals.
この磁石２にはシート状の簿物を利用するとよ
く、図示のごとき貼付状態の他にテープ状磁石を
PC鋼線１の外周に巻回すると楽に貼付できる。 It is best to use a sheet-like book for this magnet 2, and in addition to the attached state as shown in the figure, a tape-like magnet can also be used.
It can be easily attached by winding it around the outer circumference of the PC steel wire 1.
なお、図示は省略したが、２本より、19本より
等のPC鋼より線やPC鋼棒の場合も同様にして
PC鋼より線の外面に長さ方向に沿つて連続的に
又は一定間隔で磁石２を貼付する。 Although not shown, the same procedure can be applied to 2-strand, 19-strand, etc. PC steel stranded wires and PC steel bars.
Magnets 2 are attached continuously or at regular intervals along the length direction to the outer surface of the PC steel stranded wire.
第３図、第４図は本発明の他の実施例を示すも
ので、アンボンド用のPC鋼材の場合は防せい材
を兼ねた保護シース４付きのものが用いられる。 FIGS. 3 and 4 show other embodiments of the present invention, and in the case of unbonded prestressing steel, one with a protective sheath 4 that also serves as a rust prevention material is used.
この場合は、PC鋼線１、PC鋼棒３を被覆する
保護シース４中に磁粉体５を埋設混合して偏平簿
物の磁石を構成する。 In this case, magnetic powder 5 is embedded and mixed in a protective sheath 4 covering the PC steel wire 1 and the PC steel bar 3 to constitute a magnet for a flat book item.
このようにして、磁石２を貼付し、あるいは磁
粉体５を付したPC鋼材を鉄筋とともに所定位置
に配置し、コンクリートを打設する。 In this way, the PC steel material to which the magnet 2 is attached or the magnetic powder 5 is attached is placed together with the reinforcing bars at a predetermined position, and concrete is poured.
コンクリート硬化後、釘打ち、アンカーの穴あ
けなどを行うに際し、PC鋼材をさけるため、そ
の配設位置を探知するには、市販されている磁気
探知器７を用いて打設したコンクリート６の面上
をなぞればPC鋼線１にある磁石２からの磁力が
検知され、これによりPC鋼材の配設場所を知る
ことができる。 After the concrete has hardened, when driving nails, drilling anchor holes, etc., in order to avoid the prestressing steel material, in order to detect the placement position, use a commercially available magnetic detector 7 to detect the location of the prestressed steel material on the surface of the poured concrete 6. By tracing the magnetic force from the magnet 2 on the PC steel wire 1, the magnetic force from the magnet 2 on the PC steel wire 1 can be detected, and from this it is possible to know the location of the PC steel material.
なお、コンクリート６中には鉄筋８も埋設され
ているが、この鉄筋８には磁力が付されていない
ので、磁気探知器７が該鉄筋８を検知してしまう
ことはない。さらに、市販されている磁気探知器
７は磁石のＮ極側を主として検知するものであ
り、磁石２を適宜間隔を存して断続的に設けた場
合は、該磁気探知器７への出力も断続的な明瞭な
信号となり、検知の確実性が向上する。 Although reinforcing bars 8 are also buried in the concrete 6, since no magnetic force is attached to these reinforcing bars 8, the magnetic detector 7 will not detect the reinforcing bars 8. Furthermore, the commercially available magnetic detector 7 mainly detects the north pole side of the magnet, and if the magnets 2 are installed intermittently at appropriate intervals, the output to the magnetic detector 7 will also be The result is a clear intermittent signal, which improves the reliability of detection.
以上述べたように本発明のPC鋼材の探知方法
は、PC鋼材に配設する磁石の形状が簿物なので、
PC鋼材の丸みに被覆するだけで、簡単に取付け
が完了し、一方、コンクリートに打込んだPC鋼
材の位置を磁力により検知するので、鉄筋等の他
の金属とは区別してPC鋼材のみを簡単かつ確実
に検知でき、釘打ちなどによる損傷を防止できる
ものである。
As mentioned above, the method for detecting prestressing steel of the present invention is based on the shape of the magnet placed on the prestressing steel.
Installation can be easily completed by simply covering the roundness of the prestressing steel, and since the position of the prestressed steel cast into concrete is detected by magnetic force, it is easy to separate the prestressed steel from other metals such as reinforcing bars. Moreover, it can be detected reliably and damage caused by nailing etc. can be prevented.
第１図、第２図は本発明のPC鋼材の探知方法
で用いるPC鋼線の斜視図、第３図は同上保護シ
ースを施したPC鋼線の斜視図、第４図は同上PC
鋼材の斜視図、第５図はPC鋼材の探知状態を示
す説明図である。
１……PC鋼線、２……磁石、３……PC鋼棒、
４……保護シース、５……磁粉体、６……コンク
リート、７……磁気探知器、８……鉄筋。
Figures 1 and 2 are perspective views of the PC steel wire used in the method for detecting PC steel materials of the present invention, Figure 3 is a perspective view of the PC steel wire with the same protective sheath as above, and Figure 4 is the same as the PC steel wire as above.
A perspective view of the steel material, FIG. 5 is an explanatory diagram showing the detection state of the PC steel material. 1...PC steel wire, 2...Magnet, 3...PC steel bar,
4...Protective sheath, 5...Magnetic powder, 6...Concrete, 7...Magnetic detector, 8...Reinforcement bar.
Claims (1)
て一定間隔で該PC鋼材の上周面を覆うように配
設し、このPC鋼材をコンクリート内に打込んだ
後、磁気検知器を用いてコンクリート外面から前
記PC鋼材に配設した磁石による磁力を検知する
ことを特徴としたPC鋼材の探知方法。1 Place flat book magnets at regular intervals along the length of the prestressing steel material so as to cover the upper circumferential surface of the prestressing steel material, and after placing the prestressing steel material into concrete, install a magnetic detector. A method for detecting a prestressed steel material, the method comprising: detecting the magnetic force of a magnet disposed on the prestressed steel material from the outer surface of the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62212370A JPS6454280A (en) | 1987-08-25 | 1987-08-25 | Exploration of pc steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62212370A JPS6454280A (en) | 1987-08-25 | 1987-08-25 | Exploration of pc steel material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6454280A JPS6454280A (en) | 1989-03-01 |
| JPH0532717B2 true JPH0532717B2 (en) | 1993-05-17 |
Family
ID=16621438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62212370A Granted JPS6454280A (en) | 1987-08-25 | 1987-08-25 | Exploration of pc steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6454280A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5017873A (en) * | 1989-03-15 | 1991-05-21 | Schonstedt Instrument Company | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as buried fiber optic cables |
| US5006806A (en) * | 1989-03-15 | 1991-04-09 | Schonstedt Instrument Company | Methods and apparatus employing permanent magnets for marking, locating, tracing and identifying hidden objects such as burried fiber optic cables |
| US5206065A (en) * | 1989-03-15 | 1993-04-27 | Schonstedt Instrument Company | Methods, apparatus and devices relating to magnetic markers for elongated hidden objects |
| US5051034A (en) * | 1989-12-18 | 1991-09-24 | Gas Research Institute | Magnetically detectable plastic pipe |
| CN110618193B (en) * | 2018-06-20 | 2024-05-07 | 武汉知行建科工程技术有限公司 | Magnetic powder type steel bar detection device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5646480A (en) * | 1979-09-25 | 1981-04-27 | Nec Corp | Magnetic sign system |
| JPS6165603A (en) * | 1984-09-07 | 1986-04-04 | Nec Corp | High frequency signal transmission line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4935247U (en) * | 1972-06-30 | 1974-03-28 |
-
1987
- 1987-08-25 JP JP62212370A patent/JPS6454280A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5646480A (en) * | 1979-09-25 | 1981-04-27 | Nec Corp | Magnetic sign system |
| JPS6165603A (en) * | 1984-09-07 | 1986-04-04 | Nec Corp | High frequency signal transmission line |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6454280A (en) | 1989-03-01 |
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