KR20000058753A - Full Bridge Circuited Electrical Resistance Type Sensor Attached to the Surface of Steel Pipe Piles - Google Patents

Full Bridge Circuited Electrical Resistance Type Sensor Attached to the Surface of Steel Pipe Piles Download PDF

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Publication number
KR20000058753A
KR20000058753A KR1020000035815A KR20000035815A KR20000058753A KR 20000058753 A KR20000058753 A KR 20000058753A KR 1020000035815 A KR1020000035815 A KR 1020000035815A KR 20000035815 A KR20000035815 A KR 20000035815A KR 20000058753 A KR20000058753 A KR 20000058753A
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South Korea
Prior art keywords
sensor
steel pipe
pile
full bridge
steel tube
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KR1020000035815A
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Korean (ko)
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최용규
성인출
박성철
정창규
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최용규
정창규
박성철
성인출
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Priority to KR1020000035815A priority Critical patent/KR20000058753A/en
Publication of KR20000058753A publication Critical patent/KR20000058753A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/10—Miscellaneous comprising sensor means

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE: An electric resistance sensor having a full bridge circuit to adhere on the surface of a steel tube pile is provided, which is as a sensor manufactured to form a full bridge circuit on a sensor adhesive part by gluing four pieces of an electric resistance sensor on the surface of a steel tube pile and measures the axial strain of a pile, stress and load. CONSTITUTION: An electric resistance sensor having a full bridge circuit to adhere on the surface of a steel tube pile (9) comprises the steps of; evening the surface of a steel tube pile (9) and removing impurities by using cleaning equipment for the surface of a steel tube pile (9); placing four pieces of an electric resistance strain gage sensor (1) parallel to the center of a pile and gluing on a steel tube pile (9); after completing the hardening of glue, forming a full bridge circuit by using the terminal connected to four pieces of a strain gage sensor (1); connecting an input terminal (6) and an output terminal (7) by soldering; applying a high-viscosity waterproof agent (2) thin in several times to protect a sensor part and a coupling wire (8); after 24 hours, applying an asphalt pad (3) and a rubber pad (4) for protection against insects; applying a secondary waterproof silicon (5).

Description

강관말뚝표면에 접착시키는 완전결선형 회로를 가진 전기저항식 센서{Full Bridge Circuited Electrical Resistance Type Sensor Attached to the Surface of Steel Pipe Piles}Full bridge circuited electrical resistance type sensor attached to the surface of steel pipe piles

본 발명은 강관말뚝의 표면에 직접 접착하여 사용할 수 있는 센서이며, 강관말뚝기초의 축방향 변형율, 응력 그리고 하중을 측정하는 장치에 관한 것이다.The present invention is a sensor that can be used directly bonded to the surface of the steel pipe pile, and relates to a device for measuring the axial strain, stress and load of the steel pipe pile foundation.

강관말뚝기초의 축방향 변형율, 응력 그리고 하중을 측정하기 위하여 변형율계가 개발되기 전에는 말뚝의 임의 위치에 변형막대(telltale)를 고정시켜 지상에서 막대의 표고차를 측정하여 말뚝의 변형을 직접 측정하였다. 강관말뚝에 변형막대를 설치할 경우에는 용접으로 강관표면(9)에 튼튼하게 고정시켜야 하는데, 강관말뚝의 항타설치도중 용접부위가 손상되어 변형막대가 기능을 할 수 없는 경우도 많았다. 또한, 강관말뚝이 긴 경우에는 변형막대 자체도 용접으로 연결시켜야 하는데, 이것은 항타진동에 의한 충격에 견디기가 어렵다. 또한, 변형봉의 수직성 유지도 곤란하여 제대로 변위를 측정하는 것은 매우 어렵다. 그 이후 전기저항식 변형율계와 진동식 변형율계가 개발되어져 강관말뚝의 축방향 변형율, 응력 그리고 하중을 측정하기 위해 사용되었다. 그러나, 이들 변형율계는 지중에 매설될 경우 방수에 의하여 손상되어 제기능을 발휘하지 못하는 경우가 많았으며, 강관말뚝은 주로 항타시공되므로 항타진동이나 충격에 의해 이들 센서는 손상당하기 쉬운 단점이 있었다.Before the strain gauge was developed to measure the axial strain, stress and load of steel pipe pile foundations, the stakes were fixed on the ground by measuring the height of the rod on the ground and directly measuring the strain of the pile. When the deformation rod is installed on the steel pipe pile, it must be firmly fixed on the surface of the steel pipe by welding. In many cases, the welding rod is damaged during the driving installation of the steel pipe pile, and thus the deformation rod cannot function. In addition, when the steel pipe pile is long, the deformation bar itself must also be connected by welding, which is difficult to withstand the shock caused by the driving vibration. In addition, it is also difficult to maintain the verticality of the strain bar, it is very difficult to measure the displacement properly. Since then, electrical and strain strain gauges have been developed and used to measure the axial strain, stress and load of steel pipe piles. However, these strain gauges were often damaged by waterproofing when buried in the ground, and steel pipe piles were mainly driven, so these sensors were susceptible to damage due to vibration and shock.

전기저항식 센서의 경우 결선방식에 의한 오차도 많이 수반되어지는데, 현재까지는 1개의 센서만을 말뚝의 축방향으로 부착시키는 1게이지결선방법(Quarter Bridge Circuit)을 사용하여 왔는데, 이 방법은 대기중과 지중의 온도차에 의해 영향을 많이 받아 정확도에 있어 문제가 있었다. 좀 더 나은 방법으로 2게이지결선방법(Half Bridge Circuit)을 사용하기도 하였다. 즉, 2개의 센서를 말뚝의 중심축에서 대칭으로 하여 축방향으로 부착하여 결선하는데, 온도차에 의한 보정은 이루어질 수 있으나 센서의 안정성에 문제가 있었다.In the case of the electric resistance sensor, there are many errors due to the wiring method. Until now, the one-gauge wiring method (Quarter Bridge Circuit) which attaches only one sensor in the axial direction of the pile has been used. There was a problem in accuracy due to the influence of the ground temperature difference. A better way was to use a half-gauge circuit. That is, the two sensors are symmetrically attached to the pile in the axial direction and connected in the axial direction, but correction by the temperature difference can be made, but there is a problem in the stability of the sensor.

따라서, 지중에 시공되는 강관말뚝에 진동식 변형율계나 전기저항식 변형율계를 직접 설치하여 강관말뚝의 변형율, 응력 그리고 하중을 측정하는 것은 문제가많았으므로, 4개의 전기저항식 변형율계를 강관표면(9)에 접착시킨 후, 강관표면(9)에서 완전결선형 회로를 구성하여 제작된 완전결선형 전기저항식 강관표면부착형 센서를 사용하면 기존의 문제점들을 해결할 수 있다.Therefore, it was problematic to directly measure the strain, stress, and load of steel pipe piles by directly installing a vibratory strain gauge or an electrical resistance strain gauge on the steel pipe piles installed in the ground. After bonding to the), using the fully-connected electrical resistance type steel tube surface-mounted sensor produced by constructing a fully-connected circuit on the steel pipe surface (9) can solve the existing problems.

본 발명에서 제작된 센서는 4개의 전기저항식 변형율계를 강관표면(9)에 직접 접착시켜 센서부착부위에서 완전결선회로를 이루도록 제작된 센서로서 강관말뚝의 축방향 변형율을 측정하는데 사용할 수 있으며, 응력과 하중을 측정하는 데에도사용할 수 있는 전기저항식 센서장치이다.The sensor manufactured in the present invention can be used to measure the axial strain of the steel pipe pile as a sensor manufactured by directly attaching four electrical resistance strain gauges to the steel pipe surface 9 to form a complete connection circuit at the sensor attachment part. An electrical resistive sensor device that can also be used to measure stress and load.

제1도는 본 발명에 대한 대표도(전개도)1 is a representation of the present invention (development)

제2도는 본 발명에 대한 단면도2 is a cross-sectional view of the present invention

제3도는 본 발명에 대한 절개도3 is a cutaway view of the present invention

제4도는 제3도에서 볼 수 있는 완전결선회로도의 개념도4 is a conceptual diagram of the complete wiring diagram shown in FIG.

제5도는 강관표면에 설치한 모습(정면도)5 is installed on the surface of the steel pipe (front view)

제6도는 강관표면에 설치한 모습(단면도)Figure 6 shows the installation on the surface of the steel pipe (section)

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1...전기저항식 스트레인게이지 센서 2...방수용 코팅재1.Electric Strain Gage Sensor 2.Waterproof Coating

3...아스팔트 패드 4...방충용 패드3.Asphalt pad 4 ... Insect pad

5...2차 방수용 실리콘 6...입력단자5 ... 2 waterproof silicone 6 ... input terminal

7...출력단자 8...연결전선7.Output terminal 8 ... Connection wire

9...강관표면 10...측정기로 연결9 ... Steel pipe surface 10 ... Connection

11...방수 및 방충처리된 전기저항식 센서 12...강재 챈널11 ... waterproof and insectproof electrical resistive sensor 12 ... steel channel

13...강재 챈널 선단부 보호용 슈 14...연결전선 고정용 클램프13 ... steel channel tip protection shoe 14 ... clamping cable clamp

15...연결전선의 여유길이15.Free length of connecting wire

본 발명은 강관부재, 동종의 전기저항식 변형율계(1) 4개, 강관표면 청소용품, 느리게 경화되는 강력접착제, 방수도포재(2), 방충용 도포재(3) 및 패드재(4), 2차 방수용 실리콘(5) 등으로 제작되어지며 반드시 제4도와 같은 완전결선회로를 이루어야 한다. 여기서, 전기저항식 변형율계는 어떤 제품이든 상관이 없으며, 장기적인 내구성을 가지도록 하기 위하여 늦은 속도로 경화되는 강력접착제를 사용하여야 한다.The present invention is a steel pipe member, four electrical resistance strain gauges (1) of the same type, steel pipe surface cleaning products, a slow curing strong adhesive, waterproof coating material (2), insect repellent coating material (3) and pad material (4) It is made of a secondary waterproof silicone (5), etc., and must complete the complete wiring circuit as shown in FIG. In this case, the electrical resistance strain gauge may be any product, and a strong adhesive that hardens at a slow speed should be used in order to have long-term durability.

충분히 경화하여 강관표면에 접착된 4개의 동종의 전기저항식 변형율계(1)는 완전결선형 회로를 구성하여 대기조건과 지중조건에서의 온도차이를 보정할 수 있도록 하였다. 완전결선회로의 입력단자(6)와 출력단자(7)에 쉴드용 전선(8)을 납땜으로 연결하고 지상에 있는 측정기에 연결(10)될 수 있게 하였다.Four types of electrical resistivity strain gauges (1), which had been fully cured and adhered to the surface of steel pipes, formed a fully connected circuit to compensate for temperature differences between atmospheric and underground conditions. The shield wire 8 was soldered to the input terminal 6 and the output terminal 7 of the complete wiring circuit and connected to the measuring instrument on the ground 10.

강관표면(9)에 접착시키는 완전결선형 전기저항식 센서의 제작과정은 다음과 같다. 먼저, 강관표면 청소용품을 사용하여 강관표면(9)을 평탄하게 하고 깨끗하게 청소하여 불순물을 제거하며, 준비된 전기저항식 변형율계(1) 4개를 말뚝중심축 방향에 평행하게하여 강력접착제로 강관표면(9)에 접착시킨다. 접착제의 경화가 완료되면 4개의 변형율계에 연결된 터미널을 이용하여 완전결선회로를 이루게 한 후 인입용 전선(6)과 인출용 쉴드전선(7)을 납땜하여 연결한 후 센서부와 연결전선의 보호를 위하여 점도가 높은 방수재를 얇게 여러 번 도포하여 방수처리(2)를 하고 24시간 이상 경과후 아스팔트 도포재와 고무패드를 이용하여 방충처리(3, 4)를 한 다음 2차 방수재(5)를 도포한다.The fabrication process of the fully wired electrical resistance sensor bonded to the steel pipe surface 9 is as follows. First, the steel pipe surface (9) is flattened and cleaned to remove impurities by using a steel pipe surface cleaning product, and the prepared four electrical resistance strain gauges (1) are parallel to the direction of the pile center axis to be a strong adhesive To the surface 9. After the curing of the adhesive is completed, make a complete wiring circuit by using the terminals connected to the four strain gauges, and solder the connecting wire (6) and the drawing shield wire (7), and then protect the sensor unit and the connecting wire. For this, apply a thin layer of waterproof material (2) for several times, and after 24 hours or more, use an asphalt coating material and a rubber pad to perform insect repellent treatment (3, 4), and then use the secondary waterproof material (5). Apply.

본 발명의 바람직한 실시 예를 적용된 실제 사례를 통하여 상세하게 설명하면 다음과 같다.If described in detail through a practical example applied preferred embodiment of the present invention as follows.

〈적용예 1〉<Application example 1>

직경 1,000 mm인 강관말뚝표면에 부착시킨 완전결선형 전기저항식 센서를 강관말뚝의 표면에 직접 부착하여 이루어진 센서설치도는 제5도와 제6도와 같으며, 인출(6) 및 인입(7)용 쉴드전선을 센서부에 연결시킨 후 쉴드전선(8)을 센서부 바로 위에서 고정시켜 쉴드전선의 움직임에 의한 방수 및 방충용 도포재와 패드재(2, 3, 4)의 손상을 방지할 수 있도록 해야 한다. 또한, 연결용 쉴드전선(8)이 항타도중 손상되는 것을 방지할 수 있도록 전선을 약 5 m간격으로 S자형으로 접어두었다. 말뚝 항타로 인하여 완성된 센서부와 연결전선(8)이 주변 흙과 마찰되어 손상되지 않도록 보호용 강재 챈널(12)을 강관표면(9)에 용접하여 보호하였다.The sensor installation diagram made by directly attaching the fully wired electrical resistance sensor attached to the steel pipe pile surface having a diameter of 1,000 mm to the surface of the steel pipe pile is shown in FIGS. 5 and 6, and is for drawing (6) and drawing (7). After connecting the shield wire to the sensor part, fix the shield wire 8 directly above the sensor part to prevent damage to the waterproofing and insect proof coating material and pad material (2, 3, 4) caused by the movement of the shield wire. Should be. In addition, the wires were folded in an S-shape at intervals of about 5 m to prevent the connecting shield wire 8 from being damaged during helming. The protective steel channel (12) was welded to the steel pipe surface (9) so that the sensor part and the connection wire (8) completed by the pile driving were not damaged by friction with the surrounding soil.

강관말뚝의 표면(9)에 직접 부착하여 완전결선형 센서를 제작하면 말뚝의 축방향 변형율, 응력 그리고 하중을 측정할 수 있다. 따라서, 여러 가지 어려움으로인하여 불가능하다고 인식되어왔거나 극히 곤란하다고 인식되어온 강관말뚝의 하중전이측정이 가능할 수 있다. 또한, 강관표면(9)에서 완전결선회로를 이루게 되면 연결전선(8)이 움직이더라도 신호가 안정되어 항타잔류하중의 측정도 할 수 있다.By attaching directly to the surface 9 of the steel pipe pile, a fully connected sensor can be used to measure the axial strain, stress and load of the pile. Therefore, it may be possible to measure the load transition of steel pipe piles that have been recognized as impossible or extremely difficult due to various difficulties. In addition, when the complete connection circuit is formed on the steel pipe surface 9, the signal is stabilized even when the connecting wire 8 is moved, so that the driving residual load can be measured.

Claims (3)

4개의 동종의 전기저항식 변형율계(1)를 강관표면(9)에 접착시켜 제작된 완전결선회로를 가진 전기저항식 센서Electrical resistance sensor with complete wiring circuit made by bonding four homogeneous resistance strain gauges (1) to the steel pipe surface (9) 제1항에 있어서, 강관표면(9)에 연결전선(8)을 센서부 상단에서 고정시키는 방법(제5도)The method according to claim 1, wherein the connecting wires 8 are fixed to the steel pipe surface 9 at the upper end of the sensor unit (FIG. 5). 제1항에 있어서, 연결전선(8)을 S자형으로 접어 절단되지 않도록 처리하는 방법(제5도)The method according to claim 1, wherein the connecting wire 8 is folded to an S-shape so as not to be cut (FIG. 5).
KR1020000035815A 2000-06-14 2000-06-14 Full Bridge Circuited Electrical Resistance Type Sensor Attached to the Surface of Steel Pipe Piles KR20000058753A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104947722A (en) * 2015-06-26 2015-09-30 武汉中和工程技术有限公司 Foundation pile high strain stress sensor installation pad and installation method thereof
JP2018071692A (en) * 2016-10-31 2018-05-10 日鉄住金パイプライン＆エンジニアリング株式会社 Conductor-added pipeline and method for producing conductor-added pipeline
CN108532589A (en) * 2018-05-25 2018-09-14 北京市地质工程公司 A kind of hollowcore precast pile pile being equipped with pile body stress meter and its processing method
CN117661646A (en) * 2023-11-07 2024-03-08 中交二航局第一工程有限公司 High-precision measuring device flexibly applied to pipe pile soil compaction effect and construction method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104947722A (en) * 2015-06-26 2015-09-30 武汉中和工程技术有限公司 Foundation pile high strain stress sensor installation pad and installation method thereof
JP2018071692A (en) * 2016-10-31 2018-05-10 日鉄住金パイプライン＆エンジニアリング株式会社 Conductor-added pipeline and method for producing conductor-added pipeline
CN108532589A (en) * 2018-05-25 2018-09-14 北京市地质工程公司 A kind of hollowcore precast pile pile being equipped with pile body stress meter and its processing method
CN117661646A (en) * 2023-11-07 2024-03-08 中交二航局第一工程有限公司 High-precision measuring device flexibly applied to pipe pile soil compaction effect and construction method thereof
CN117661646B (en) * 2023-11-07 2024-05-17 中交二航局第一工程有限公司 High-precision measuring device flexibly applied to pipe pile soil compaction effect and construction method thereof

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