JPH08302722A - Inspecting method of pile foundation - Google Patents

Inspecting method of pile foundation

Info

Publication number
JPH08302722A
JPH08302722A JP13120495A JP13120495A JPH08302722A JP H08302722 A JPH08302722 A JP H08302722A JP 13120495 A JP13120495 A JP 13120495A JP 13120495 A JP13120495 A JP 13120495A JP H08302722 A JPH08302722 A JP H08302722A
Authority
JP
Japan
Prior art keywords
pile
pile foundation
damage
foundation
ground
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.)
Withdrawn
Application number
JP13120495A
Other languages
Japanese (ja)
Inventor
Hiroshi Ikemi
拓 池見
Original Assignee
Fujita Corp
株式会社フジタ
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujita Corp, 株式会社フジタ filed Critical Fujita Corp
Priority to JP13120495A priority Critical patent/JPH08302722A/en
Publication of JPH08302722A publication Critical patent/JPH08302722A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE: To confirm the presence of the damage of a footing and the state of the damage by a hollow existing pile driven and arranged into the ground easily in a short time. CONSTITUTION: When a concrete structure is installed anew, an inspecting hole 14 reaching the hollow section 13 of a pile foundation 10 while being penetrated to filled concrete 12 on the inner circumference of a pile head 11 is provided openly from the top face of a footing 20 and covered previously with a cap 15, and a visual sensor 16 such as a fiber scope, a CCD camera, etc., is inserted into the hollow section of the pile foundation 10 through the inspecting hole 14 when an earthquake of a large seismic coefficient is generated. The presence of damage or the state of the damage is inspected visually on the ground from the inner circumference of the pile foundation 10 by an image data detected by the visual sensor 16.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、RC杭、PC杭あるい
は鋼管杭等の既製杭基礎を採用している橋脚や橋台、各
種擁壁、建物等において、竣工後における前記既製杭基
礎の破損を点検するための方法に関する。
BACKGROUND OF THE INVENTION The present invention relates to a bridge pier, an abutment, various retaining walls, a building, etc. that employ ready-made pile foundations such as RC piles, PC piles or steel pipe piles, and the damage to the ready-made pile foundations after completion. Regarding the method for checking.
【0002】[0002]
【従来の技術】遠心力によってコンクリートを成形しプ
レストレスを与えたPC杭、鉄筋コンクリート杭(RC
杭)あるいは鋼管杭等の中空の既製杭による杭基礎を採
用している構造物、例えば橋脚や橋台、各種擁壁、建物
等においては、前記杭基礎に、地震や地盤の変化等によ
って破損することがある。このような既製杭基礎は地盤
中にあるため、当然ながら、地上からは破損の状況を視
認することができず、したがって、既製杭基礎の破損の
有無や破損状況を点検するために、従来は、図3に示す
ように、構造物1の下側の、杭基礎2,3の周辺の地盤
4を掘削する方法が採られていた。なお、上記図3にお
いて(A)の杭基礎2は鋼管杭からなるものであり、
(B)の杭基礎3はPC杭又はRC杭からなるものであ
る。
2. Description of the Related Art Pre-stressed PC piles and reinforced concrete piles (RC
Piles) or steel pipe piles and other structures that use hollow prefabricated pile foundations, such as piers and abutments, various retaining walls, buildings, etc., will be damaged by the earthquake or changes in the ground. Sometimes. Since such ready-made pile foundations are located in the ground, it is naturally impossible to visually recognize the damage status from the ground. As shown in FIG. 3, a method of excavating the ground 4 below the structure 1 and around the pile foundations 2 and 3 has been adopted. In addition, in FIG. 3 above, the pile foundation 2 of (A) is made of a steel pipe pile,
The pile foundation 3 of (B) is made of PC pile or RC pile.
【0003】[0003]
【発明が解決しようとする課題】しかし、上記従来の方
法によれば、杭基礎2又は3が直接見える状態になるま
で構造物1の下側の地盤4を掘削しなければならず、ま
たこのため矢板等による土留めを施す必要が生じる場合
もあり、多大な労力と時間を要していた。また、地盤を
掘削することによって全ての杭基礎を露出させようとす
ると、地盤による構造物の支持力を失うことになるの
で、鋼材等を使った大掛かりな仮受を構築して前記構造
物を支持することが必要になる。したがって、杭基礎の
点検のために実際に地盤を掘削できるのは、構造物下面
の端部や辺部に位置する杭基礎の周囲に限定されるのが
現状である。
However, according to the above-mentioned conventional method, it is necessary to excavate the ground 4 below the structure 1 until the pile foundations 2 or 3 can be directly seen. Therefore, it may be necessary to apply earth retaining such as sheet pile, which requires a lot of labor and time. Also, if you try to expose all pile foundations by excavating the ground, you will lose the bearing capacity of the structure due to the ground, so construct a large-scale temporary support using steel etc. You need to support it. Therefore, the fact that the ground can be actually excavated for the inspection of the pile foundation is currently limited to the periphery of the pile foundation located at the end or side of the lower surface of the structure.
【0004】本発明は、上記のような事情のもとになさ
れたもので、その技術的課題とするところは、地盤中に
打設配置された中空の既製杭による基礎の破損の有無や
破損状況を容易にかつ短時間で確認可能とすることにあ
る。
The present invention has been made under the circumstances described above, and its technical problem is to determine whether or not the foundation is damaged by hollow prefabricated piles placed in the ground. It is to be able to confirm the situation easily and in a short time.
【0005】[0005]
【課題を解決するための手段】上述した技術的課題は、
本発明によって有効に解決することができる。すなわち
本発明に係る杭基礎の点検方法は、フーチング又は基礎
スラブからRC杭、PC杭あるいは鋼管杭等の既製杭に
よる杭基礎上端の杭頭内周の中詰めコンクリートを貫通
して前記杭基礎の中空部に達する点検孔を開設し、この
点検孔を通じて前記杭基礎の中空部に破損又は変形検出
手段を挿入して杭基礎の破損の有無、破損の状況又は変
形状況を点検するものである。この方法において一層好
ましくは、前記点検孔には、密封的かつ着脱自在に蓋体
を嵌着しておく。また、破損又は変形検出手段として
は、例えばCCDカメラやファイバスコープ等の視覚セ
ンサあるいは傾斜計が好適に用いられる。
The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, the method for inspecting a pile foundation according to the present invention is such that a footing or a foundation slab penetrates through the filling concrete of the inner circumference of the pile head at the upper end of the pile foundation by the ready-made pile such as RC pile, PC pile or steel pipe pile. An inspection hole reaching the hollow portion is opened, and a damage or deformation detecting means is inserted into the hollow portion of the pile foundation through the inspection hole to inspect whether the pile foundation is damaged, the damage condition or the deformation condition. In this method, more preferably, a lid is fitted in the inspection hole in a sealed and detachable manner. Further, as the damage or deformation detecting means, for example, a visual sensor such as a CCD camera or a fiberscope or an inclinometer is preferably used.
【0006】[0006]
【作用】上記の方法において、フーチング又は基礎スラ
ブから杭基礎の杭頭内周の中詰めコンクリートを貫通し
て開設した点検孔は、地震等が発生した場合に視覚セン
サ等による破損又は変形検出手段を地上から前記杭基礎
の中空部に挿入して、この杭基礎の破損の有無又は破損
状況を点検するためのもので、平常時において杭基礎の
傾倒等の変形を計測する場合は、例えば傾斜計が挿入さ
れる。また、破損が確認された場合には、前記中空部へ
コンクリートやモルタル等の補修材を充填するための注
入孔として利用できる。点検孔に密封的かつ着脱自在に
嵌着される蓋体は、地中に埋設状態となるフーチング等
の基礎の場合に、埋め戻した土砂や地下水等が点検孔か
ら杭基礎の中空部へ入るのを防止するものである。
In the above method, the inspection hole opened from the footing or foundation slab through the inner filling concrete of the pile head inner circumference of the pile foundation is a means for detecting damage or deformation by a visual sensor or the like when an earthquake or the like occurs. Is inserted from the ground into the hollow part of the pile foundation to inspect for the presence or absence of damage to the pile foundation, and when measuring deformation such as tilting of the pile foundation in normal times, for example, tilt The meter is inserted. Further, when damage is confirmed, it can be used as an injection hole for filling the hollow portion with a repair material such as concrete or mortar. The lid that is removably and removably fitted in the inspection hole is the foundation such as footing that is buried in the ground, and the backfilled earth and sand and groundwater enter the hollow part of the pile foundation through the inspection hole. To prevent this.
【0007】[0007]
【実施例】図1は、本発明に係る杭基礎の点検方法の一
実施例を示すもので、図中の参照符号10は地盤Gに打
ち込まれた既製杭の一種である鋼管杭からなる杭基礎、
20はこの杭基礎10上にあって橋梁の基礎部分として
構築されたフーチングである。杭基礎10は中空円筒状
であって、図示されていないその下端の杭先は先鋭な円
錐状に形成されており、中詰めコンクリート12が充填
された上端の杭頭11は、フーチング20の下部に一体
的に接合されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a method for inspecting a pile foundation according to the present invention. Reference numeral 10 in the drawing is a pile made of a steel pipe pile which is a kind of ready-made pile driven into the ground G. Foundation,
20 is a footing constructed on the pile foundation 10 as a foundation portion of the bridge. The pile foundation 10 has a hollow cylindrical shape, and the tip of the pile at the lower end (not shown) is formed in a sharp cone shape, and the pile head 11 at the upper end filled with the filled concrete 12 is the lower portion of the footing 20. Are integrally joined to.
【0008】この実施例の方法においては、まず図1
(A)に示すように、構造物を新設する場合、杭基礎1
0の杭頭11に中詰めコンクリート12を打設し、その
上にフーチング20を構築するためのコンクリートを打
設する際に、コンクリート打設箇所に適当な太さの抜き
型を配置しておくことによって、前記フーチング20の
上面から杭頭11内周の中詰めコンクリート12を貫通
して杭基礎10の中空部13に達する点検孔14を開設
する。この場合の点検孔14は、後述するCCDカメラ
等の破損又は変形検出手段を挿入するためのものである
から、それを考慮して適宜の開口面積で開設される。開
口形状も特に規定するものではないが、フーチング20
に作用する応力の集中を考慮すれば円形の開口形状とす
るのが望ましい。また、既設構造物の場合でも、コンク
リートブレーカやコンクリートカッタを使ってフーチン
グ20のコンクリート及び杭頭11に中詰めコンクリー
ト12を貫通する点検孔14を開設することは可能であ
る。
In the method of this embodiment, first, referring to FIG.
As shown in (A), when constructing a new structure, pile foundation 1
When placing the filling concrete 12 on the pile head 11 of 0, and placing the concrete for constructing the footing 20 on it, place a die with an appropriate thickness at the place of placing the concrete. By doing so, an inspection hole 14 is opened from the upper surface of the footing 20 through the inner filling concrete 12 of the pile head 11 to the hollow portion 13 of the pile foundation 10. Since the inspection hole 14 in this case is for inserting a damage or deformation detecting means such as a CCD camera described later, the inspection hole 14 is opened with an appropriate opening area in consideration of it. Although the opening shape is not particularly specified, the footing 20
Considering the concentration of the stress acting on, it is desirable to make the opening shape circular. Further, even in the case of an existing structure, it is possible to use the concrete breaker or the concrete cutter to open the inspection hole 14 which penetrates the concrete 12 of the footing 20 and the pile head 11 through the filled concrete 12.
【0009】構築された橋梁のフーチング20は、通
常、地盤中に埋め戻されるため、開設された点検孔14
には、シール性の良い適当な材質からなるキャップ15
を密嵌しておく。これによって、点検孔14から杭基礎
10内への土砂等の侵入を防止することができる。
Since the footing 20 of the constructed bridge is normally backfilled in the ground, the inspection hole 14 that has been opened.
The cap 15 is made of a suitable material having a good sealing property.
Fit tightly. As a result, it is possible to prevent intrusion of earth and sand or the like from the inspection hole 14 into the pile foundation 10.
【0010】震度の大きい地震の発生等によって杭基礎
10の破損の有無もしくは破損の状況を点検する必要が
生じた場合は、フーチング20上の土砂を取り除いて点
検孔14からキャップ15を外し、図1(B)に示すよ
うに、点検孔14を通じて杭基礎10の中空部にファイ
バスコープやCCDカメラ等の視覚センサ16を挿入
し、この視覚センサ16で検出される画像データによっ
て杭基礎10の内周から破損の有無もしくは破損の状況
を、地上で視覚的に点検する。破損が発見された場合
は、補修材としてのコンクリートやモルタルを、点検孔
14を通じて杭基礎10の内周に充填する。
When it is necessary to check the presence or absence of damage to the pile foundation 10 due to the occurrence of an earthquake with a large seismic intensity, etc., remove the earth and sand on the footing 20, remove the cap 15 from the inspection hole 14, and As shown in FIG. 1 (B), a visual sensor 16 such as a fiberscope or a CCD camera is inserted into the hollow portion of the pile foundation 10 through the inspection hole 14, and the image data detected by the visual sensor 16 is used to detect the inside of the pile foundation 10. Visually inspect the ground for the presence or absence of damage or the condition of damage. When damage is found, concrete or mortar as a repair material is filled into the inner circumference of the pile foundation 10 through the inspection hole 14.
【0011】また、平常時であっても、経年的な地盤沈
下や地盤の歪等によって杭基礎10が傾斜変形を受けた
りすることがあるが、このような点検の場合は、上述と
同様にして、点検孔14から杭基礎10の中空部に傾斜
計(図示省略)を挿入し、この傾斜計を介して、杭基礎
10の傾斜の状況を地上から点検し、その傾斜データか
ら必要な措置を講じることができる。
Further, even during normal times, the pile foundation 10 may be subject to tilt deformation due to ground subsidence, ground distortion, etc., but in the case of such inspection, the same as described above is performed. Then, an inclinometer (not shown) is inserted into the hollow portion of the pile foundation 10 through the inspection hole 14, the inclination of the pile foundation 10 is inspected from the ground through the inclinometer, and necessary measures are taken from the inclination data. Can be taken.
【0012】なお、上記実施例においては、杭基礎10
が鋼管杭からなるものとして説明したが、図2に示すよ
うなPC杭あるいはRC杭等の中空の既製杭からなるも
のであっても、同様に適用可能である。また、図1及び
図2では、点検孔14がほぼ鉛直に開設されているが、
点検孔14を形成しようとするフーチング20上部にに
構造物の立ち上がり部が存在するような場合には、その
場所を避ける方向に開設すれば良く、すなわち必ずしも
鉛直方向である必要はない。
In the above embodiment, the pile foundation 10
Was made up of steel pipe piles, but it is also applicable to hollow piles such as PC piles and RC piles as shown in FIG. Further, in FIG. 1 and FIG. 2, the inspection hole 14 is opened almost vertically,
If there is a rising portion of the structure above the footing 20 where the inspection hole 14 is to be formed, it may be opened in a direction avoiding the place, that is, it is not always required to be in the vertical direction.
【0013】また、上記実施例においては、橋梁等の基
礎について説明したが、本発明は、例えば建物の基礎ス
ラブから地盤中に延びる杭基礎の破損点検についても、
同様に適用することができる。
In the above embodiments, the foundations of bridges and the like have been described, but the present invention also relates to the damage inspection of the pile foundation extending from the foundation slab of the building into the ground, for example.
It can be applied similarly.
【0014】[0014]
【発明の効果】本発明に係る杭基礎の点検方法によれ
ば、地震等の天変地異が発生した場合に、地盤中の既製
杭基礎の破損の有無や破損状況、あるいは地盤沈下等に
よる前記杭基礎の傾斜変形を、適当な視覚センサあるい
は傾斜計を介して地上から杭の内部を点検することがで
きるため、従来のように大規模な周辺地盤の掘削によっ
て杭基礎自体を地盤から露出させる必要がなく、点検作
業を少ない労力で容易・迅速にかつ確実に行うことがで
きる。また、開設された点検孔は、破損が検出された場
合の補修材注入孔としても利用できるといった優れた効
果を奏する。
According to the pile foundation inspection method of the present invention, when a natural disaster such as an earthquake occurs, the presence or absence of damage to the ready-made pile foundation in the ground, the damage condition, or the ground subsidence causes the pile to be damaged. Since it is possible to inspect the inside of the pile from the ground for the inclination deformation of the foundation via an appropriate visual sensor or inclinometer, it is necessary to expose the pile foundation itself from the ground by excavating large-scale surrounding ground as in the past. In addition, the inspection work can be performed easily, quickly and surely with little labor. Further, the opened inspection hole has an excellent effect that it can be used also as a repair material injection hole when damage is detected.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明に係る杭基礎の点検方法の一実施例とし
て、杭基礎が鋼管杭である場合を示す説明図である。
FIG. 1 is an explanatory view showing a case where a pile foundation is a steel pipe pile as an embodiment of a method for inspecting a pile foundation according to the present invention.
【図2】本発明に係る杭基礎の点検方法の他の実施例と
して、杭基礎がPC杭あるいはRC杭である場合を示す
説明図である。
FIG. 2 is an explanatory view showing a case where the pile foundation is a PC pile or an RC pile as another embodiment of the pile foundation inspection method according to the present invention.
【図3】従来技術による杭基礎の点検方法を示す説明図
である。
FIG. 3 is an explanatory diagram showing a method for inspecting a pile foundation according to a conventional technique.
【符号の説明】[Explanation of symbols]
10 杭基礎 11 杭頭 12 中詰めコンクリート 14 点検孔 15 キャップ 16 視覚センサ 20 フーチング 10 Pile Foundation 11 Pile Head 12 Filled Concrete 14 Inspection Hole 15 Cap 16 Visual Sensor 20 Footing

Claims (4)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 地盤に打ち込まれた中空の既製杭による
    杭基礎及びこの杭基礎の頭部に形成されたフーチング又
    は基礎スラブとを有する構造物において、 前記フーチング又は基礎スラブから前記杭基礎上端の杭
    頭内周の中詰めコンクリートを貫通して前記杭基礎の中
    空部に達する点検孔を開設し、 この点検孔から前記杭基礎の中空部に破損又は変形検出
    手段を挿入して前記杭基礎の破損の有無、破損状況又は
    変形状況を点検することを特徴とする杭基礎の点検方
    法。
    1. A structure having a pile foundation made of hollow prefabricated piles driven into the ground and a footing or a foundation slab formed on the head of the pile foundation, wherein the footing or the foundation slab extends from the top of the pile foundation. An inspection hole that penetrates the inner filling of the pile head and reaches the hollow part of the pile foundation is opened, and a damage or deformation detection means is inserted into the hollow part of the pile foundation from this inspection hole to insert A method for inspecting a pile foundation, characterized by inspecting for the presence or absence of damage, the condition of damage or the condition of deformation.
  2. 【請求項2】 請求項1の記載において、 点検孔には、密封的かつ着脱自在に蓋体を嵌着すること
    を特徴とする杭基礎の点検方法。
    2. The method of inspecting a pile foundation according to claim 1, wherein a lid is hermetically and detachably fitted in the inspection hole.
  3. 【請求項3】 請求項1の記載において、 破損又は変形検出手段は視覚センサであることを特徴と
    する杭基礎の点検方法。
    3. The method for inspecting a pile foundation according to claim 1, wherein the breakage or deformation detecting means is a visual sensor.
  4. 【請求項4】 請求項1の記載において、 破損又は変形検出手段は傾斜計であることを特徴とする
    杭基礎の点検方法。
    4. The method for inspecting a pile foundation according to claim 1, wherein the damage or deformation detecting means is an inclinometer.
JP13120495A 1995-05-02 1995-05-02 Inspecting method of pile foundation Withdrawn JPH08302722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13120495A JPH08302722A (en) 1995-05-02 1995-05-02 Inspecting method of pile foundation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13120495A JPH08302722A (en) 1995-05-02 1995-05-02 Inspecting method of pile foundation

Publications (1)

Publication Number Publication Date
JPH08302722A true JPH08302722A (en) 1996-11-19

Family

ID=15052484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13120495A Withdrawn JPH08302722A (en) 1995-05-02 1995-05-02 Inspecting method of pile foundation

Country Status (1)

Country Link
JP (1) JPH08302722A (en)

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EP1655132A2 (en) 1996-08-06 2006-05-10 Mitsubishi Chemical Corporation Positive photosensitive lithographic printing plate
CN104580870A (en) * 2013-10-17 2015-04-29 甘肃第六建设集团股份有限公司 Camera fixing control device for acquiring acceptance images of ultra-deep pile hole
CN105019485A (en) * 2015-08-11 2015-11-04 中国电建集团华东勘测设计研究院有限公司 Static load test detection method for foundation pit excavation pile foundation
JP2016011492A (en) * 2014-06-27 2016-01-21 鹿島建設株式会社 Pile investigation method
CN105735379A (en) * 2016-04-13 2016-07-06 西南石油大学 Detecting device for drilling pouring pile bottom sediment
CN107893436A (en) * 2017-10-31 2018-04-10 中冶天工集团有限公司 A kind of pile foundation sound ranging pipes dredger and its operating method
CN108914988A (en) * 2018-07-18 2018-11-30 广东惠利普路桥信息工程有限公司 A kind of grouting or completeness detection device of driving piles
CN110270563A (en) * 2019-06-28 2019-09-24 中国二十冶集团有限公司 Bored concrete pile sound detecting pipe plugging method for cleaning
CN110578345A (en) * 2018-06-11 2019-12-17 杭州西南检测技术股份有限公司 O-cell test pile steel bar connector

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EP1655132A2 (en) 1996-08-06 2006-05-10 Mitsubishi Chemical Corporation Positive photosensitive lithographic printing plate
CN104580870A (en) * 2013-10-17 2015-04-29 甘肃第六建设集团股份有限公司 Camera fixing control device for acquiring acceptance images of ultra-deep pile hole
JP2016011492A (en) * 2014-06-27 2016-01-21 鹿島建設株式会社 Pile investigation method
CN105019485A (en) * 2015-08-11 2015-11-04 中国电建集团华东勘测设计研究院有限公司 Static load test detection method for foundation pit excavation pile foundation
CN105019485B (en) * 2015-08-11 2017-03-01 中国电建集团华东勘测设计研究院有限公司 A kind of excavation of foundation pit dead load test on pile foundation detection method
CN105735379A (en) * 2016-04-13 2016-07-06 西南石油大学 Detecting device for drilling pouring pile bottom sediment
CN107893436A (en) * 2017-10-31 2018-04-10 中冶天工集团有限公司 A kind of pile foundation sound ranging pipes dredger and its operating method
CN110578345A (en) * 2018-06-11 2019-12-17 杭州西南检测技术股份有限公司 O-cell test pile steel bar connector
CN108914988A (en) * 2018-07-18 2018-11-30 广东惠利普路桥信息工程有限公司 A kind of grouting or completeness detection device of driving piles
CN110270563A (en) * 2019-06-28 2019-09-24 中国二十冶集团有限公司 Bored concrete pile sound detecting pipe plugging method for cleaning

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