NL9200770A - Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving - Google Patents

Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving Download PDF

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Publication number
NL9200770A
NL9200770A NL9200770A NL9200770A NL9200770A NL 9200770 A NL9200770 A NL 9200770A NL 9200770 A NL9200770 A NL 9200770A NL 9200770 A NL9200770 A NL 9200770A NL 9200770 A NL9200770 A NL 9200770A
Authority
NL
Netherlands
Prior art keywords
pile
driving
movement
optical
during pile
Prior art date
Application number
NL9200770A
Other languages
Dutch (nl)
Original Assignee
Hendrik Van Koten
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 Hendrik Van Koten filed Critical Hendrik Van Koten
Priority to NL9200770A priority Critical patent/NL9200770A/en
Publication of NL9200770A publication Critical patent/NL9200770A/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/06—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers for observation while placing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/48—Investigating hardness or rebound hardness by performing impressions under impulsive load by indentors, e.g. falling ball
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0005—Repeated or cyclic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0212—Theories, calculations
    • G01N2203/0218—Calculations based on experimental data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0244—Tests performed "in situ" or after "in situ" use

Abstract

The invention relates to an apparatus by means of which the displacement of a moving object such as a pile during pile-driving can be measured. This involves the object being provided with a retroreflective disc and being illuminated by a laser. The movement is converted into a digital signal and further processed by means of a computer. The apparatus is characterized by the measurement of the movement without contact between moving object and measuring apparatus.

Description

"APPARAAT VOOR HET OPTISCH EN CONTACTLOOS METEN VAN DE GRONDWEERSTAND VAN HEIPALEN TIJDENS HEIEN”"APPARATUS FOR THE OPTICAL AND CONTACT-FREE MEASUREMENT OF THE SOIL RESISTANCE OF PILOTS DURING PILING"

De uitvinding betreft een meetapparaat, waarmee de beweging van een heipaal langs optische weg wordt gemeten. Uit de beweging wordt de grootte van de kracht van het heiblok afgeleid en de weerstand van de grond bepaald. Deze weerstand wordt direct met een computer berekend en op een printer geschreven. Daardoor is het resultaat van het heien van een paal met een bekende draagkracht onmiddellijk af te lezen. Het heien kan daarmede op het juiste ongenblik’worden gestopt. De verplaatsing wordt gemeten door met een lichtgevoelige opnemer de plaats van een daarop geprojecteerde reflex van een laserstraal te registreren. De reflex van de laserstraal wordt verkregen door het licht van de laser te projecteren op een retro-reflecterende strook, die op de paal is geplakt. De laser en de opnemer bevinden zich naast elkaar op een voor de paal te plaatsen wagentje.The invention relates to a measuring device with which the movement of a pile is measured optically. The magnitude of the force of the pile driver is derived from the movement and the resistance of the soil is determined. This resistance is calculated directly with a computer and written on a printer. As a result, the result of driving a pile with a known bearing capacity can be read immediately. Pile driving can thus be stopped at the right moment. The displacement is measured by registering the location of a reflex of a laser beam projected on it with a light-sensitive sensor. The reflex of the laser beam is obtained by projecting the light from the laser onto a retro-reflective strip, which is glued to the pole. The laser and the sensor are located next to each other on a trolley to be placed in front of the pole.

Als de paal beweegt, dan beweegt de projectie van de gereflecteerde laserstraal.When the pole moves, the projection of the reflected laser beam moves.

De verplaatsing van de paal wordt door de meetapparatuur in een electrisch signaal omgezet. Dat signaal wordt gedigitaliseerd, waarna het met een computer kan worden verwerkt tot de spanning in de paal en de weerstand, die de paal van de grond ondervindt. Daaruit kan de draagkracht van de paal worden afgeleid.The displacement of the pile is converted into an electrical signal by the measuring equipment. That signal is digitized, after which it can be processed with a computer into the voltage in the pile and the resistance that the pile experiences from the ground. The bearing capacity of the pile can be derived from this.

Een tot nu veel gebruikte methode is het bepalen van de zakking per slag van het heiblok, door het tellen van het aantal slagen, dat nodig is om de paal 25 cm te laten zakken. Daartoe worden krijtstrepen op afstanden van 25 cm op de paal aangebracht en wordt het aantal slagen, dat nodig is om de paal een streep dieper in de grond te slaan, geteld. Uit de zakking per slag wordt een schatting van de draagkracht gemaakt. Deze schatting is vele malen vergeleken met het resultaat van de door belasten van de paal gemeten draagkracht en is daarbij zeer onnauwkeurig gebleken.A method that has been widely used until now is to determine the sag per stroke of the pile driver by counting the number of strokes required to lower the pile by 25 cm. To do this, pinstripes are placed at a distance of 25 cm on the post and the number of strokes required to drive the post one strip deeper into the ground is counted. An estimate of the carrying capacity is made from the collapse per stroke. This estimate has been compared many times with the result of the carrying capacity measured by loading the pile and has proved to be very inaccurate.

Een vergelijkbaar apparaat is gepatenteerd uit het Amerikaanse octrooischrift 3.535.919. Hiermee wordt ook de draagkracht bepaald, echter door het aanbrengen van aan de paal geschroefde of geklemde opnemers. Deze apparatuur is daardoor niet geschikt voor metingen tijdens het heien van palen.A similar device is patented from U.S. Pat. No. 3,535,919. This also determines the load-bearing capacity, however, by installing sensors screwed or clamped to the post. This equipment is therefore not suitable for measurements during pile driving.

Een tweede apparaat voor het meten van de respons van een paal t.g.v. een drukstoot op de bovenzijde is bekend uit het octrooi nr.179314 NL.A second device for measuring the response of a pile as a result of a pressure impact on the top is known from patent no. 179314 NL.

Helaas kan daarmee de draagkracht niet worden bepaald, maar wel de kwaliteit van de paal.Unfortunately, this cannot determine the carrying capacity, but it does determine the quality of the pile.

Claims (1)

De vinding betreft een apparaat, waarmee de verplaatsing van een bewegend object, zoals een heipaal tijdens heien, gemeten kan worden, waarbij het object slechts met een laser wordt beschenen. De beweging wordt omgezet tot een digitaal signaal, dat door een computer ter plaatse kan worden geanalyseerd. Het apparaat is gekenmerkt door het meten van de beweging zonder contact te hebben met het bewegende voorwerp. Registratie van de beweging langs electroni-sche weg maakt het mogelijk zeer snelle verschijnselen, zoals het bewegen van een paal tijdens het heien te meten.The invention relates to a device with which the displacement of a moving object, such as a pile during pile driving, can be measured, whereby the object is only illuminated with a laser. The movement is converted into a digital signal, which can be analyzed on site by a computer. The device is characterized by measuring the movement without having contact with the moving object. Recording the movement electronically makes it possible to measure very fast phenomena, such as the movement of a pile during pile driving.
NL9200770A 1992-04-28 1992-04-28 Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving NL9200770A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL9200770A NL9200770A (en) 1992-04-28 1992-04-28 Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9200770A NL9200770A (en) 1992-04-28 1992-04-28 Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving
NL9200770 1992-04-28

Publications (1)

Publication Number Publication Date
NL9200770A true NL9200770A (en) 1993-11-16

Family

ID=19860746

Family Applications (1)

Application Number Title Priority Date Filing Date
NL9200770A NL9200770A (en) 1992-04-28 1992-04-28 Apparatus for optical and non-contact measuring of the soil resistance of piles during pile-driving

Country Status (1)

Country Link
NL (1) NL9200770A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834791A1 (en) * 2002-01-14 2003-07-18 Ptc Determination of the force acting on an object forced into the ground by a vibrator, whereby after object insertion, the force required to move the object is measured from which the static force acting on it is induced

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2834791A1 (en) * 2002-01-14 2003-07-18 Ptc Determination of the force acting on an object forced into the ground by a vibrator, whereby after object insertion, the force required to move the object is measured from which the static force acting on it is induced
EP1411177A1 (en) * 2002-01-14 2004-04-21 Ptc Process and apparatus for assessment of the bearing capacity of an object inserted into the ground through vibration

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