JPH10239262A - Method for diagnosing damage of pile and underground pile whose damage can be detected - Google Patents
Method for diagnosing damage of pile and underground pile whose damage can be detectedInfo
- Publication number
- JPH10239262A JPH10239262A JP4205397A JP4205397A JPH10239262A JP H10239262 A JPH10239262 A JP H10239262A JP 4205397 A JP4205397 A JP 4205397A JP 4205397 A JP4205397 A JP 4205397A JP H10239262 A JPH10239262 A JP H10239262A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- wire
- damage
- signal
- tip
- 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.)
- Granted
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、地盤中に埋設し
た状態で破損の有無あるいは破損位置が検知可能な杭お
よびその破損診断方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile capable of detecting the presence or absence of a break or the position of a break when the pile is buried in the ground, and a method of diagnosing the break.
【０００２】[0002]
【従来の技術】既成コンクリート杭等の地中杭が地震等
により地盤中で破損したとしても、地上からは目視でき
ないため、その確認が難しい。2. Description of the Related Art Even if an underground pile, such as an existing concrete pile, is damaged in the ground due to an earthquake or the like, it is difficult to confirm it because it cannot be visually observed from the ground.
【０００３】すなわち、例えば上部構造物を支持する地
中杭について、破損が生じていないかどうか、また破損
が生じている場合においてその破損位置を調べる必要が
生じた場合、従来は図８に示すように地面を掘り返し、
直接目視によって確認することしかできなかった。図
中、１１は既成コンクリート杭、１２はフーチング、１
３，１４が損傷部、１５が掘返し部を示す（ｈは掘返し
深さ）。That is, for example, if it is necessary to check whether an underground pile supporting an upper structure has been damaged or not and if it is necessary to check the location of the damage, conventionally, the structure is shown in FIG. Dig the ground like
It could only be confirmed directly by visual observation. In the figure, 11 is an existing concrete pile, 12 is footing, 1
Reference numerals 3 and 14 denote damaged portions and 15 denotes a dug portion (h denotes a dug depth).
【０００４】[0004]
【発明が解決しようとする課題】しかし、既存の構造物
の下を掘り返すというのは、実際にはその準備が大がか
りとなり、工期も長く、コストが大となる。However, excavating under an existing structure actually requires a large amount of preparation, a long construction period, and a large cost.
【０００５】また、長い杭の深い位置についての確認が
困難である上、破損がないことが確認された場合には、
掘り返し作業等が全て無駄になる。In addition, it is difficult to confirm the deep position of the long pile, and if it is confirmed that there is no breakage,
All digging work is wasted.
【０００６】本願発明は、このような問題点の解決を図
ったものであり、地盤の掘り返しを必要としない経済的
で効率の良い破損検知可能な杭および地中杭の破損診断
方法を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and provides an economical and efficient pile capable of detecting breakage, which does not require excavation of the ground, and a method of diagnosing breakage of an underground pile. It is intended to be.
【０００７】[0007]
【課題を解決するための手段】本願請求項１に係る破損
検知可能な杭は、導体のワイヤーを杭体の両端間に絶縁
状態に埋設し、このワイヤーを系外と電気接続するため
の接続部を杭体の一端に設けたものである。According to a first aspect of the present invention, there is provided a pile capable of detecting a breakage, wherein a conductor wire is buried in an insulated state between both ends of a pile body, and a connection for electrically connecting the wire to outside the system is provided. The part is provided at one end of the pile body.
【０００８】ワイヤーの先端は、非接地とする場合と接
地とする場合の２ケースが考えられる。請求項２は接地
（アース）状態とするため、ワイヤーの先端を杭体の前
記接続部と反対側の端部に設けた金具に接続してある場
合を限定したものである。There are two cases where the tip of the wire is ungrounded and grounded. Claim 2 limits the case where the tip of the wire is connected to a metal fitting provided at the end of the pile body opposite to the connection portion in order to be in the ground (earth) state.
【０００９】本願請求項３に係る発明は、上記請求項１
または２記載の破損検知可能な杭を用いた地中杭の破損
診断方法であり、杭体の前記接続部を設けた側の端部を
上にして地中に埋設し、系外と電気接続したワイヤー
に、ファンクションジェネレータ（以下、ＦＧと呼ぶ）
等により所定の入力（電気）信号を印加し、オシロスコ
ープ（以下、ＯＳＣと呼ぶ）等により入力信号と反射信
号の和として観測される観測信号（電圧）から杭体の破
損の有無を検知するものである。The invention according to claim 3 of the present application is directed to the above-described claim 1.
Or a method of diagnosing damage to an underground pile using the damage detectable pile according to 2 above, wherein the pile is buried in the ground with the end on the side where the connection portion is provided up, and electrically connected to outside the system Function generator (hereinafter referred to as FG)
A method of applying a predetermined input (electric) signal according to the method described above, and detecting the presence or absence of breakage of a pile from an observation signal (voltage) observed as a sum of an input signal and a reflected signal by an oscilloscope (hereinafter referred to as OSC) or the like. It is.
【００１０】杭体に破損がない場合には、入力信号はワ
イヤーの先端位置で反射され、ＯＳＣ等による観測信号
において共振（入力信号と反射信号が互いに打ち消し合
う場合を含む）が確認され、それによって杭体に破損が
ないことが分かる。If the pile is not damaged, the input signal is reflected at the position of the tip of the wire, and resonance (including the case where the input signal and the reflected signal cancel each other) is observed in the observation signal by OSC or the like. This shows that the pile is not damaged.
【００１１】また、杭体に破損がある場合には、入力信
号は破損位置で反射され、観測信号において非共振が確
認され、それによって杭体に破損があることが分かる。If the pile is damaged, the input signal is reflected at the damaged position, and non-resonance is confirmed in the observation signal, indicating that the pile is damaged.
【００１２】なお、先端が非接地の場合は反射位置まで
の距離分の位相遅れを有しかつ反転された波形の反射信
号となるのに対し、先端が接地の場合には反転されずに
反射位置までの距離分の位相遅れを有する波形の反射信
号となる。When the tip is not grounded, the reflected signal has a phase delay corresponding to the distance to the reflection position and has an inverted waveform. On the other hand, when the tip is grounded, the reflected signal is not inverted. The reflected signal has a waveform having a phase delay corresponding to the distance to the position.
【００１３】また、杭体に破損がある場合には、ワイヤ
ーが杭体とともに断線したかしないかにかかわらず、そ
の部分が実質的に接地状態となるため、破損位置までの
位相遅れを伴った波形（反転なし）の反射信号が現れ
る。Further, when the pile body is damaged, regardless of whether or not the wire is broken together with the pile body, the portion is substantially in the ground state, so that there is a phase delay to the broken position. A reflected signal with a waveform (no inversion) appears.
【００１４】本願請求項４に係る発明は、請求項３では
杭体の破損の有無を検知するのに対し、さらにその破損
位置まで検知するようにしたものである。In the invention according to claim 4 of the present application, while the presence or absence of breakage of the pile body is detected in claim 3, it is further detected up to the breakage position.
【００１５】すなわち、破損がない場合を想定して入力
された入力信号において、非共振が確認された場合に、
入力信号の周波数を変化させることにより、杭体に破損
がある状態での共振周波数を求め、この共振周波数より
杭体の破損位置を推定するものである。That is, when non-resonance is confirmed in an input signal input on the assumption that there is no damage,
By changing the frequency of the input signal, a resonance frequency in a state where the pile body is damaged is obtained, and a broken position of the pile body is estimated from the resonance frequency.
【００１６】杭体に破損がある場合には、破損位置から
反射信号が発せられるため、往復で考えると杭体の先端
から破損位置までの長さの２倍に対応して共振波長が短
くなり、すなわち共振周波数が高くなり、電気信号の速
度ｃと周波数との関係から破損位置が分かる（共振波長
の１／２から、例えばＦＧ−端子間の導線の長さを引い
た長さが杭体の破損位置となる）。If the pile is damaged, a reflected signal is emitted from the damaged position. Therefore, when the pile is reciprocated, the resonance wavelength becomes shorter corresponding to twice the length from the tip of the pile to the damaged position. That is, the resonance frequency increases, and the position of the damage can be determined from the relationship between the speed c and the frequency of the electric signal (the length obtained by subtracting the length of the conducting wire between the FG and the terminal from 1/2 of the resonance wavelength is the pile Is the damaged position).
【００１７】ワイヤーは破損を検知する杭ごと少なくと
も１本埋設し、必要に応じ複数本埋設する。At least one wire is buried for each pile whose breakage is to be detected, and a plurality of wires are buried if necessary.
【００１８】また、破損の有無の検知や破損位置の推定
は、ＯＳＣ等を利用した目視に限らず、コンピュータに
よる解析や演算回路等を利用することも可能である。Further, the detection of the presence or absence of damage and the estimation of the position of the damage are not limited to visual observation using OSC or the like, but may be performed by computer analysis or arithmetic circuits.
【００１９】ワイヤーの杭体への埋め込みは、既成杭の
場合は工場製作時に現場打ちの場合のような面倒な作業
なしで行うことができる。例えば、先端が接地の場合に
はワイヤーの先端を端板等に接続しておいたり、また非
接地の場合も何らかの留付け部材に接続しておくことで
杭体内でのワイヤーのずれ等を容易になくすことがで
き、精度の高い製品が得られる。その他、もちろん現場
打ちの杭にも適用可能である。The embedding of the wire into the pile body can be performed in the case of a prefabricated pile without any troublesome work as in the case of cast-in-place at the time of manufacturing a factory. For example, when the tip is grounded, the tip of the wire is connected to the end plate, etc., and when the tip is not grounded, it is connected to some fastening member to easily shift the wire inside the pile. And a highly accurate product can be obtained. In addition, it is of course applicable to piles cast in place.
【００２０】なお、本願発明において使用するワイヤー
としては、例えば銅線等が利用され、杭体の破損ととも
に断線する場合や杭体が破損しても断線しない場合が考
えられる。通常の場合は、杭体が破損することでその部
分に地下水等の浸透もあり接地状態となるため、杭体の
破損とともにワイヤーが断線することは必ずしも要求さ
れないが、積極的に断線させる方法としては、例えば焼
結金属製のワイヤーや、セラミック内に細径の銅線を埋
め込んだもの等を用いることも考えられる。As the wire used in the present invention, for example, a copper wire or the like is used, and it is conceivable that the wire is broken when the pile is damaged or that the wire is not broken even if the pile is damaged. In the normal case, breakage of the pile causes groundwater to infiltrate into the area and the ground is established, so it is not always required that the wire breaks with the breakage of the pile, but as a method of positively breaking the wire It is also conceivable to use, for example, a wire made of a sintered metal or a wire in which a small-diameter copper wire is embedded in a ceramic.
【００２１】[0021]
【実施の形態】図１は本願発明の破損検知可能な杭およ
び地中杭の破損診断方法の一実施形態における装置配置
を概略的に示したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows the arrangement of devices in one embodiment of a method for diagnosing damage to a pile capable of detecting damage and an underground pile according to the present invention.
【００２２】図に示すように、既成コンクリート杭１等
の杭体中に、銅線等の導体からなるワイヤー２を埋設し
ておく。As shown in the figure, a wire 2 made of a conductor such as a copper wire is buried in a pile body such as an existing concrete pile 1.
【００２３】地中に埋設した状態におけるワイヤー２の
上端側は杭頭付近に設けた端子３に接続してあり、先端
２ａはコンクリート中に埋設したままの絶縁（非接地）
状態とするか、あるいは杭先端の金属製の端板４に接続
してアース（接地）状態とする２通りが考えられる。な
お、端子３には、常時は防水用のキャップ等が取り付け
てある。The upper end of the wire 2 buried in the ground is connected to a terminal 3 provided near the pile head, and the tip 2a is insulated (not grounded) while buried in concrete.
There are two ways of setting the state, or connecting to the metal end plate 4 at the tip of the pile to set the earth (ground) state. Note that a waterproof cap or the like is always attached to the terminal 3.
【００２４】地震等の要因で、杭１の破損の有無を調べ
る必要が生じたときには、端子３のキャップを取り外
し、ＦＧ（関数発生器）５とＯＳＣ６を端子３に接続
し、矩形波をワイヤー２に入力する。When it is necessary to check the pile 1 for damage due to an earthquake or the like, the cap of the terminal 3 is removed, the FG (function generator) 5 and the OSC 6 are connected to the terminal 3, and the rectangular wave is wired. Enter 2
【００２５】(1) ワイヤー２の先端が非接地の場合 図２はワイヤー２の先端を非接地とした場合において、
地中杭１に破損がない場合のワイヤー２への入力（電
気）信号、出力信号、観測信号の関係の一例を示したも
のである。(1) When the tip of the wire 2 is not grounded FIG. 2 shows the case where the tip of the wire 2 is not grounded
FIG. 3 shows an example of a relationship among an input (electric) signal, an output signal, and an observation signal to the wire 2 when the underground pile 1 is not damaged.
【００２６】ＦＧ５から杭１先端部に埋め込まれている
ワイヤー２の先端までの距離（杭長あるいはワイヤー２
の長さ＋端子３からＦＧ５までの導線の長さ）をＬとす
る。The distance from the FG 5 to the tip of the wire 2 embedded in the tip of the pile 1 (pile length or wire 2
L + length of the conductor from terminal 3 to FG5).
【００２７】１波長が２Ｌとなる入力信号を印可した場
合、ワイヤー２先端での反射信号は、入力波形に対し距
離Ｌに対応する位相遅れを有しかつ反転した波形とな
る。ＯＳＣ６で観測される波形はこれら入力波形と反射
波形を足し合わせたものであり、杭体に破損がなければ
入力信号に対し２倍の電圧の観測信号が観測される。When an input signal whose wavelength is 2L is applied, the reflected signal at the tip of the wire 2 has a phase lag corresponding to the distance L to the input waveform and is an inverted waveform. The waveform observed by the OSC 6 is the sum of the input waveform and the reflected waveform. If the pile is not damaged, an observation signal having a voltage twice that of the input signal is observed.
【００２８】なお、仮にＦＧ５からワイヤー２の先端ま
でを１０ｍ、ＦＧ５から端子３までを１ｍ、杭長９ｍと
仮定すると、１波長＝２Ｌ＝２０ｍとなり、その場合の
周波数は１５ＭＨｚとなる。Assuming that the distance from the FG 5 to the tip of the wire 2 is 10 m, the distance from the FG 5 to the terminal 3 is 1 m, and the pile length is 9 m, one wavelength = 2 L = 20 m, and the frequency in that case is 15 MHz.
【００２９】図３はワイヤー２の先端を非接地とした場
合において、地中杭１に破損がある場合のワイヤー２へ
の入力信号、出力信号、観測信号の関係の一例を示した
ものである。FIG. 3 shows an example of a relationship among an input signal, an output signal, and an observation signal to the wire 2 when the underground pile 1 is damaged when the tip of the wire 2 is not grounded. .
【００３０】この場合の位相遅れは、ＦＧ５から破損位
置までの距離Ｌ’（＜Ｌ）に対応する位相遅れであり、
また破損により破損位置でワイヤー２が接地状態となる
ため、反転のない反射波形となる。図の例はＬ’＝Ｌ／
２としているが、一般的にはより複雑な波形となる。The phase delay in this case is a phase delay corresponding to the distance L '(<L) from the FG 5 to the broken position.
Further, since the wire 2 is grounded at the broken position due to breakage, a reflection waveform without inversion is obtained. The example in the figure is L '= L /
Although it is set to 2, it generally has a more complicated waveform.
【００３１】ＯＳＣ６によって図３のような観測信号が
観測されることにより、杭体に破損があることが分か
る。Observation signals as shown in FIG. 3 by the OSC 6 indicate that the pile is damaged.
【００３２】また、この場合、入力信号の波長を２Ｌか
ら徐々に短くして行き（すなわち周波数を徐々に高くし
て行き）、入力信号の波長が２Ｌ’になると、図４に示
すように入力信号と反射信号が互いに打ち消し合う共振
周波数に達し、従ってＦＧ５から杭体の破損位置までの
距離（導線の長さを含む）が分かる。Further, in this case, the wavelength of the input signal is gradually shortened from 2L (ie, the frequency is gradually increased), and when the wavelength of the input signal becomes 2L ', as shown in FIG. The signal and the reflected signal reach a resonance frequency at which they cancel each other, and thus the distance (including the length of the conductor) from the FG 5 to the breakage position of the pile is known.
【００３３】(2) ワイヤー２の先端が接地の場合 図５はワイヤー２の先端を接地（先端２ａを端板４に接
続）した場合において、地中杭１に破損がない場合のワ
イヤー２への入力（電気）信号、出力信号、観測信号の
関係の一例を示したものである。(2) When the tip of the wire 2 is grounded FIG. 5 shows a case where the tip of the wire 2 is grounded (the tip 2a is connected to the end plate 4) and the underground pile 1 is not damaged. 1 shows an example of a relationship among an input (electric) signal, an output signal, and an observation signal.
【００３４】この場合、１波長が２Ｌとなる入力信号を
印可すると、ワイヤー２先端での反射信号は、入力波形
に対し反転せずに距離Ｌに対応する位相遅れを有する波
形となる。ＯＳＣ６で観測される波形はこれら入力波形
と反射波形を足し合わせたものであり、結果として入力
信号と反射信号が互いに打ち消しあった観測信号が観測
され、これによって破損のないことが確認される。In this case, when an input signal having one wavelength of 2L is applied, the reflected signal at the tip of the wire 2 has a waveform having a phase delay corresponding to the distance L without being inverted with respect to the input waveform. The waveform observed by the OSC 6 is a sum of the input waveform and the reflected waveform. As a result, an observed signal in which the input signal and the reflected signal cancel each other is observed, and it is confirmed that there is no damage.
【００３５】図６はワイヤー２の先端を接地とした場合
において、地中杭１に破損がある場合のワイヤー２への
入力信号、出力信号、観測信号の関係の一例を示したも
のである。FIG. 6 shows an example of the relationship among the input signal, output signal, and observation signal to the wire 2 when the underground pile 1 is damaged when the tip of the wire 2 is grounded.
【００３６】この場合は、図３の場合と全く同じ状況に
あり、観測信号によって杭体に破損があることが分か
る。また、(1) のワイヤー２の先端が非接地の場合と同
様、入力信号の波長を２Ｌから徐々に短くして行き、入
力信号の波長が２Ｌ’になると、図４に示すように入力
信号と反射信号が互いに打ち消し合う共振周波数に達
し、ＦＧ５から杭体の破損位置までの距離（導線の長さ
を含む）が分かる。In this case, the situation is exactly the same as that of FIG. 3, and it can be seen from the observation signal that the pile is damaged. Also, as in the case (1) where the tip of the wire 2 is ungrounded, the wavelength of the input signal is gradually reduced from 2L, and when the wavelength of the input signal becomes 2L ', as shown in FIG. And the reflected signal reach a resonance frequency at which the signals cancel each other, and the distance (including the length of the conducting wire) from the FG 5 to the breakage position of the pile body can be determined.
【００３７】なお、杭１を多数管理する場合や、単数で
あっても杭頭に接近することが困難であると予想される
場合には、図７に示すように、一度配線を地上のスイッ
チボックス７に集め、一括して測定を行うことも可能で
ある。また、これらの測定はＯＳＣの目視に限らず、コ
ンピュータや演算回路などの利用で自動的に行うことも
できる。When managing a large number of piles 1 or when it is expected that it is difficult to approach the pile head even if it is a single pile, as shown in FIG. It is also possible to collect in the box 7 and perform the measurement collectively. Further, these measurements are not limited to the visual observation of the OSC, but can be automatically performed by using a computer, an arithmetic circuit, or the like.
【００３８】[0038]
【発明の効果】 地中杭を掘り出すことなく、地上で随時、杭の破損の
有無や破損位置を確認することができる。また、深い位
置で杭が破損していたとしても容易に診断することがで
きる。According to the present invention, it is possible to check the presence or absence of a breakage of the pile and the location of the damage at any time on the ground without excavating the underground pile. Further, even if the pile is damaged at a deep position, it can be easily diagnosed.
【００３９】常時は杭頭の端子等の接続部への接続が
なく、接続部位置まで掘り出す場合でも、その掘出し深
さは浅く、大がかりな工事は不要である。In the case where there is no connection to the connection part such as the terminal of the pile head at all times, even when excavating to the position of the connection part, the excavation depth is shallow and large-scale construction is unnecessary.
【００４０】製造から設置まで杭の健全性が確認でき
る。The soundness of the pile from production to installation can be confirmed.
【００４１】スイッチボックスを設ける等して、多数
の杭を１箇所で集中して管理することも可能である。By providing a switch box or the like, a large number of piles can be centrally managed at one place.
【図１】本願発明の地中杭の破損診断方法の一実施形態
における装置配置の概要図である。FIG. 1 is a schematic view of an apparatus arrangement in an embodiment of a method for diagnosing damage to an underground pile according to the present invention.
【図２】ワイヤーの先端を非接地とした場合において、
地中杭に破損がない場合のワイヤーへの入力信号、出力
信号、観測信号の関係の一例を示したグラフである。FIG. 2 shows a case where the tip of a wire is not grounded.
It is the graph which showed an example of the relationship between the input signal to a wire, an output signal, and an observation signal in case there is no break in an underground pile.
【図３】ワイヤーの先端を非接地とした場合において、
地中杭に破損がある場合のワイヤーへの入力信号、出力
信号、観測信号の関係の一例を示したグラフである。FIG. 3 shows a case where the tip of the wire is not grounded.
It is the graph which showed an example of the relation between the input signal to a wire, an output signal, and an observation signal when there is breakage in an underground pile.
【図４】地中杭に破損がある場合に入力信号の周波数を
上げて行き、共振周波数を求めたときのワイヤーへの入
力信号、出力信号、観測信号の関係の一例を示したグラ
フである。FIG. 4 is a graph showing an example of a relationship among an input signal, an output signal, and an observation signal to a wire when a resonance frequency is obtained by increasing a frequency of an input signal when the underground pile is damaged. .
【図５】ワイヤーの先端を接地とした場合において、地
中杭に破損がない場合のワイヤーへの入力信号、出力信
号、観測信号の関係の一例を示したグラフである。FIG. 5 is a graph showing an example of a relationship among an input signal, an output signal, and an observation signal to the wire when the tip of the wire is grounded and the underground pile is not damaged.
【図６】ワイヤーの先端を接地とした場合において、地
中杭に破損がある場合のワイヤーへの入力信号、出力信
号、観測信号の関係の一例を示したグラフである。FIG. 6 is a graph showing an example of a relationship among an input signal, an output signal, and an observation signal to the wire when the underground pile is damaged when the tip of the wire is grounded.
【図７】多数本の杭を同時に管理する場合の配置例を示
す鉛直断面図である。FIG. 7 is a vertical cross-sectional view showing an example of arrangement in a case where a large number of piles are managed simultaneously.
【図８】従来の掘返しによる方法の説明図（鉛直断面
図）である。FIG. 8 is an explanatory view (vertical cross-sectional view) of a conventional method using back-turning.
１…既成コンクリート杭、２…ワイヤー、３…端子、４
…端板、５…ファンクションジョネレータ、６…オシロ
スコープ、７…スイッチボックス1 ... precast concrete pile, 2 ... wire, 3 ... terminal, 4
... End plate, 5 ... Function generator, 6 ... Oscilloscope, 7 ... Switch box
Claims (4)
態に埋設し、前記ワイヤーを系外と電気接続するための
接続部を前記杭体の一端に設けてあることを特徴とする
破損検知可能な杭。1. A breakage characterized in that a conductor wire is buried in an insulated state between both ends of a pile, and a connection portion for electrically connecting the wire to the outside of the system is provided at one end of the pile. Detectable pile.
続部と反対側の端部に設けた金具に接続してある請求項
１記載の破損検知可能な杭。2. The damage detectable pile according to claim 1, wherein a tip of the wire is connected to a metal fitting provided at an end of the pile body opposite to the connection portion.
能な杭を、前記接続部を設けた側の端部を上にして地中
に埋設し、前記ワイヤーに所定の入力電気信号を印加
し、前記ワイヤーの先端位置または杭体に破損がある場
合には破損位置より反射される反射信号と前記入力電気
信号の和として観測される観測信号により、前記杭体の
破損の有無を検知することを特徴とする地中杭の破損診
断方法。3. A pile capable of detecting damage according to claim 1 or 2 is buried in the ground with an end on a side provided with the connection portion facing upward, and a predetermined input electric signal is applied to the wire. Then, if there is a break in the tip position of the wire or the pile, the presence or absence of breakage of the pile is detected by an observation signal observed as a sum of a reflected signal reflected from the broken position and the input electric signal. A method for diagnosing damage to an underground pile.
能な杭を、前記接続部を設けた側の端部を上にして地中
に埋設し、前記ワイヤーに所定の入力電気信号を印加
し、前記ワイヤーの先端位置または杭体に破損がある場
合には破損位置より反射される反射信号と前記入力電気
信号の和として観測される観測信号により、前記杭体の
破損の有無を検知するとともに、杭体に破損がある場合
には前記入力電気信号の周波数を変化させて共振周波数
を求め、前記共振周波数より杭体の破損位置を推定する
ことを特徴とする地中杭の破損診断方法。4. A pile capable of detecting damage according to claim 1 or 2 is buried in the ground with an end on a side provided with the connection portion facing upward, and a predetermined input electric signal is applied to the wire. Then, if there is a break in the tip position of the wire or the pile, the presence or absence of breakage of the pile is detected by an observation signal observed as a sum of a reflected signal reflected from the broken position and the input electric signal. And a method of diagnosing the damage of the underground pile, wherein, if the pile is damaged, the resonance frequency is obtained by changing the frequency of the input electric signal, and the position of the pile is estimated from the resonance frequency. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4205397A JP3599522B2 (en) | 1997-02-26 | 1997-02-26 | Damage detection method for piles and underground piles that can detect damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4205397A JP3599522B2 (en) | 1997-02-26 | 1997-02-26 | Damage detection method for piles and underground piles that can detect damage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10239262A true JPH10239262A (en) | 1998-09-11 |
| JP3599522B2 JP3599522B2 (en) | 2004-12-08 |
Family
ID=12625379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4205397A Expired - Fee Related JP3599522B2 (en) | 1997-02-26 | 1997-02-26 | Damage detection method for piles and underground piles that can detect damage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3599522B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002057729A1 (en) * | 2001-01-20 | 2002-07-25 | Technische Universität Braunschweig | State identification of electrically conductive oblong tensioning elements using resonance frequencies and a computer program |
| CN103362151A (en) * | 2013-07-30 | 2013-10-23 | 中国化学工程第一岩土工程有限公司 | Method for detecting prestress concrete pipe pile horizontal stress |
| CN104763000A (en) * | 2015-04-02 | 2015-07-08 | 福建省建筑工程质量检测中心有限公司 | Detection method for completeness of foundation pile |
| CN105064423A (en) * | 2015-08-12 | 2015-11-18 | 邓业灿 | Existing building foundation pile projection detection method |
| CN105887940A (en) * | 2014-11-13 | 2016-08-24 | 中国建筑科学研究院 | Double-speed low-strain method for detecting integrity of existing pile foundation by adopting excitation in pile body |
| CN106836316A (en) * | 2017-01-13 | 2017-06-13 | 同济大学建筑设计研究院(集团)有限公司 | A kind of Oversea wind power generation tower single-pile foundation rigidity method for testing vibration |
| CN111287226A (en) * | 2020-02-24 | 2020-06-16 | 四川道诚建设工程检测有限责任公司 | A quick interfacing apparatus that is used for pile foundation quality detection pipe of large-scale bridge engineering |
-
1997
- 1997-02-26 JP JP4205397A patent/JP3599522B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002057729A1 (en) * | 2001-01-20 | 2002-07-25 | Technische Universität Braunschweig | State identification of electrically conductive oblong tensioning elements using resonance frequencies and a computer program |
| CN103362151A (en) * | 2013-07-30 | 2013-10-23 | 中国化学工程第一岩土工程有限公司 | Method for detecting prestress concrete pipe pile horizontal stress |
| CN105887940A (en) * | 2014-11-13 | 2016-08-24 | 中国建筑科学研究院 | Double-speed low-strain method for detecting integrity of existing pile foundation by adopting excitation in pile body |
| CN104763000A (en) * | 2015-04-02 | 2015-07-08 | 福建省建筑工程质量检测中心有限公司 | Detection method for completeness of foundation pile |
| CN105064423A (en) * | 2015-08-12 | 2015-11-18 | 邓业灿 | Existing building foundation pile projection detection method |
| CN106836316A (en) * | 2017-01-13 | 2017-06-13 | 同济大学建筑设计研究院(集团)有限公司 | A kind of Oversea wind power generation tower single-pile foundation rigidity method for testing vibration |
| CN111287226A (en) * | 2020-02-24 | 2020-06-16 | 四川道诚建设工程检测有限责任公司 | A quick interfacing apparatus that is used for pile foundation quality detection pipe of large-scale bridge engineering |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3599522B2 (en) | 2004-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102472826B (en) | Proximity detection method and system for detecting conductive, embedded structure | |
| US5999107A (en) | Remote cathodic protection monitoring system | |
| JPH10510057A (en) | Method and apparatus for detecting underground utilities | |
| CN104254788B (en) | Buried facility detection | |
| CN106638729B (en) | A kind of Novel steel sheet pile inclinometer pipe protection device for installing | |
| JPH10239262A (en) | Method for diagnosing damage of pile and underground pile whose damage can be detected | |
| JP2011191208A (en) | Soil moisture measuring method and soil moisture measuring device | |
| JPH08199988A (en) | Filling method of filler and confirmation device thereof | |
| JPS61137705A (en) | Drilling method | |
| RU2733098C1 (en) | System for automated monitoring of pile foundations of building structures in permafrost regions | |
| JP4074960B2 (en) | Acoustic diagnosis / measurement apparatus using pulsed electromagnetic force, and diagnosis / measurement method thereof | |
| JP4074962B2 (en) | Acoustic diagnosis / measurement apparatus using pulsed electromagnetic force and diagnosis / measurement method thereof | |
| JPH07294233A (en) | Preventive monitoring method of damage on buried pipe | |
| JP3237055B2 (en) | Measurement method of grounding resistance of mesh grounding pole | |
| CN116446468A (en) | Visual monitoring system for soil-stone mixture slope stability | |
| JPH10267707A (en) | Optical fiber sensor for detecting topographic displacement and laying method for the same and topographic displacement detecting device using the same | |
| JP5300303B2 (en) | Damage detection system and tilt detection device | |
| JP4195761B2 (en) | Ground fault accident judgment reference electrode construction method and ground fault accident judgment reference electrode | |
| JPH0196584A (en) | Method for surveying position of piping buried under ground | |
| JP2000178955A (en) | Method and device for investigating underground structure | |
| JPH10260264A (en) | Specific resistance electric searching method | |
| JPH0762640A (en) | Landslide measurement method and device thereof | |
| CN219137789U (en) | Survey line arrangement structure based on by-pass transmission method high accuracy surveys pile foundation length | |
| JPH1138153A (en) | Buried object-detecting device | |
| JP2857781B2 (en) | Road surface cutter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040406 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040525 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040723 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040914 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040914 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070924 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080924 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080924 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090924 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090924 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100924 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110924 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110924 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110924 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110924 Year of fee payment: 7 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120924 Year of fee payment: 8 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120924 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130924 Year of fee payment: 9 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
| R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |