EP2662499B1 - Procédé d'assurance-qualité pour la réalisation de pieux et profil ouvert prévu à cet effet - Google Patents

Procédé d'assurance-qualité pour la réalisation de pieux et profil ouvert prévu à cet effet Download PDF

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Publication number
EP2662499B1
EP2662499B1 EP13166376.7A EP13166376A EP2662499B1 EP 2662499 B1 EP2662499 B1 EP 2662499B1 EP 13166376 A EP13166376 A EP 13166376A EP 2662499 B1 EP2662499 B1 EP 2662499B1
Authority
EP
European Patent Office
Prior art keywords
profile
foot
quality assurance
receiver
transmitter
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.)
Not-in-force
Application number
EP13166376.7A
Other languages
German (de)
English (en)
Other versions
EP2662499A3 (fr
EP2662499A2 (fr
Inventor
Jürgen Grabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technische Universitaet Hamburg TUHH
Tutech Innovation GmbH
Original Assignee
Technische Universitaet Hamburg TUHH
Tutech Innovation GmbH
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Filing date
Publication date
Application filed by Technische Universitaet Hamburg TUHH, Tutech Innovation GmbH filed Critical Technische Universitaet Hamburg TUHH
Publication of EP2662499A2 publication Critical patent/EP2662499A2/fr
Publication of EP2662499A3 publication Critical patent/EP2662499A3/fr
Application granted granted Critical
Publication of EP2662499B1 publication Critical patent/EP2662499B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14—Covers for manholes or the like; Frames for covers
    • 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

Definitions

  • the invention relates to a quality assurance method for creating piles in the ground with a leading, open profile and inside promotion of the soil or at the bottom closure of the profile displacement of the soil. Furthermore, the invention relates to an open profile for the creation of foundation piles.
  • Open profile means a component with a self-contained, in the longitudinal direction along the profile substantially the same cross-section.
  • the profile is open at the bottom and top. Accordingly, open profiles in addition to circular casings and square tubes, box sections, shafts, caissons and the like can be.
  • a pile is any form of foundation created by such an open profile.
  • Piles are known for foundations in difficult subsoil. They serve to remove loads in greater depths.
  • bored piles are known for vibration-free production of pile foundations for buildings on insufficiently stable ground.
  • an open profile having a circular cross-section is pressed into the ground here as piping with an oscillating movement.
  • the soil contained in the interior of this casing is removed as cuttings with a guided in the piping gripper or rinsing process.
  • a probation basket is inserted into the exposed interior of the casing and concreted, whereby the casing is removed again.
  • a plug formation in open subfloors introduced in the underground in order to use the entire bottom surface of the introduced open profile as a load-bearing surface can.
  • a plug forms when the soil within the profile tightens sufficiently. If, therefore, a foundation with an open profile driven into the subsurface with plug formation is desired or expected, its quality can hitherto not be assessed in parallel with production.
  • the object of the invention is to provide a quality assurance method for creating bored piles and a correspondingly prepared piping, in which the quality of the pile production can be monitored.
  • the compression wave velocity in the area of the subsurface near the bottom of the hole is measured, on which the concreted pile is later deposited.
  • "along a chord of the cross section of the profile” means a measurement of the compression wave velocity perpendicular to the longitudinal extent of the profile, ie in the cross section of the profile from one point of the cross section of the profile to an opposite further point on the cross section of the profile.
  • the measuring path can preferably be measured diagonally across the cross section of the profile, in the case of circular casings, in particular on the diameter, but also on shorter distances (chords).
  • the device driver receives by the information from the sound measurement a reading to assess the manufacturing quality of the pile foundation.
  • this is made possible by providing at least one sound transmitter on the inside of the profile and at least one sound receiver along a chord in the cross-section of the profile.
  • a sound transmitter and receiver piezoelectric sensors in particular ultrasonic sensors can be used, for example.
  • the measuring section should be designed along a chord of the profile, for example over the circular cross section in a casing, in particular over its diameter.
  • Sound transmitters and receivers can be measured, for example, crosswise over two substantially perpendicular to each other diameter measuring sections. Of course, other geometric distributions are possible.
  • the location of the dry concrete can be monitored by measuring the compression wave velocity.
  • the transceivers are arranged 5 cm to 40 cm, preferably 10 cm to 30 cm, particularly preferably approximately 20 cm above the lower end of the profile.
  • the transmitter / receiver are in the field of overfeed of the profile opposite the Bohrtretddling.
  • the determined compressional wave velocity of the subsurface provides a measure of the load bearing capacity or loosening of the subsurface at the bottom of the hole.
  • the temporal change of the overfeed is measured, in the case of cohesive soils the change in the bottom hole position can be measured indirectly as a result of relaxation elevations. From this, it is possible to deduce the toughness index and the "over-consolidation rate” (OCR), which can be used to determine important ground-mechanical parameters for the foundation.
  • OCR over-consolidation rate
  • the transmitter / receiver are embedded in the profile to avoid damaging the transmitter / receiver when oscillating impressions and / or pulling the profile.
  • the measuring devices can be controlled directly by the device driver and the measured values can be displayed and evaluated directly.
  • each transmitter / receiver has a power supply, in particular accumulator, to be used for a pile foundation use.
  • the measurement data is transmitted wirelessly via data transmission means, for example by radio or ultrasound transmission, whereby a simultaneous measurement data evaluation is also possible.
  • a signal logger can be provided on the transmitter / receiver, which is read after creation of the pile foundation.
  • simultaneous quality control is not possible in this embodiment, the recorded values can be used to secure the stability of the pile foundation created. It is advantageous in this embodiment, the lack of any, possibly disturbed and sensitive transmission means in the drilling situation.
  • Fig. 1 is a schematic cross-section through an area of the substrate U a depressed by a casing machine profile, here a casing 1 with a substantially cleared interior 10 is shown.
  • the casing 1 is pressed by the beginning of the earth's surface O at the desired location of a casing machine, not shown here by oscillating motion.
  • the interior 10 of the casing 1 is cleared away from the cuttings with a gripper, also not shown.
  • the conveyance of the cuttings is thereby made so that the bottom hole 21 is located about 0.5 m above the foot 11 of the casing.
  • a back-up fluid for example water, is filled in the borehole 2 (interior 10 of the casing 1).
  • transmitter / receiver 3 Near the foot 11 of the casing 1 are transmitter / receiver 3, here consisting of a sound transmitter 31 and arranged on the diameter opposite arranged sound receiver 32.
  • the sound transmitter 31 and the sound receiver 32 are in exceptions 12, which are introduced about 20 cm above the foot 11 of the casing 1, used.
  • the sound transmitter 31 transmits on activation Fig. 1 represented sound signal, which is received by the sound receiver 32 opposite. Due to the measurable transit time of the sound signal through the ground in the area below the borehole bottom 21, the compression wave velocity v p can thus be determined.
  • a further embodiment of the invention is also by suitable control and measurement recording of the sound transmitter 31 and the sound receiver 32 at the bottom hole 21, so the transition between the still fixed bottom in the interior 10 of the casing 1 and the created borehole 2 reflected wave measured ( Fig. 2 ). Based on the measured transit time and the underlying compression wave velocity from the measurement according to Fig. 1 Thus, the height of the bottom hole 21 can be determined over the foot 11 of the casing 1.
  • the quality assurance method according to the invention and the piping according to the invention it is thus possible to record the quality of the foundation already when lowering the casing and conveying the cuttings and counteract any risks due to hydraulic ground failure and / or soil loosening directly can.
  • loosening due to hydraulic ground failure or extreme ground relaxation can be verified by a significantly reduced compression wave velocity.
  • the features according to the invention when creating bored piles always the lead of the casing, so the measure between the foot 11 of the casing 1 and the bottom hole 21 can be determined by evaluating the wave reflected at the bottom hole.
  • the in-depth desirable soil layer can be verified by measuring the compression speed (high compression wave velocity feature). Possibly. can thus be stopped at a lower depth with the setting of the bored pile, which means a significant cost savings.
  • the viscosity index or the earth pressure coefficient can be determined for over-consolidated soil.
  • the quality assurance method according to the invention and the piping according to the invention is a measure for work-parallel quality control when depositing bored piles in the underground. Due to the simultaneously determined measurement results can u. U. a saving in pile length can be achieved or improved quality, ie higher carrying capacity can be verified. Furthermore, the accompanying measurement may also be indirect Subsoil digestion of undisturbed soil with regard to storage density and stress state.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Piles And Underground Anchors (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Claims (10)

  1. Procédé d'assurance qualité pour la réalisation de pieux dans le sous-sol (U) avec un profilé ouvert qui avance et évacuation par l'intérieur du sol ou, en cas de profilé fermé en bas, refoulement du sol, caractérisé en ce que la vitesse de propagation de l'onde de compression (vp) du sous-sol (U) est mesurée à l'intérieur au pied (11) du profilé ouvert (1) le long d'une corde de la section transversale du profilé (1).
  2. Procédé d'assurance qualité selon la revendication 1, caractérisé en ce que la vitesse de propagation de l'onde de compression (vp) du sous-sol (U) obtenue fournit une grandeur pour la portance ou l'ameublissement du sol (U) au pied (11) du profilé (1).
  3. Procédé d'assurance qualité selon la revendication 1 ou 2, caractérisé en ce qu'une onde réfléchie sur le fond du sondage (21) ou, en cas de profilé fermé en bas par un pied en béton sec, l'onde réfléchie par le bord inférieur du pied en béton sec est mesurée à partir du pied (11) du profilé (1).
  4. Procédé d'assurance qualité selon la revendication 3, caractérisé en ce que l'avancement du pied (11) du profilé (1) par rapport au fond du sondage (21) est déduit sur la base de la vitesse de propagation de l'onde de compression (vp) à partir du temps de parcours de l'onde réfléchie.
  5. Procédé d'assurance qualité selon la revendication 4, caractérisé en ce que la variation dans le temps de l'avancement est mesurée après que la profondeur finale ou une profondeur intermédiaire a été atteinte.
  6. Profilé (1) pour la réalisation de pieux dans le sous-sol (U), pour la mise en oeuvre d'un procédé d'assurance qualité selon l'une des revendications 1 à 5, caractérisé en ce qu'au moins un émetteur acoustique (31) est prévu à l'intérieur au pied (11) du profilé, et au moins un récepteur acoustique (32) est prévu le long d'une corde dans la section transversale du profilé et situé à l'opposé.
  7. Profilé (1) selon la revendication 6, caractérisé en ce que les émetteur/récepteur (3) sont disposés entre 5 cm et 40 cm au-dessus de l'extrémité inférieure du profilé (1), de préférence entre 10 cm et 30 cm, de façon privilégiée à environ 20 cm.
  8. Profilé (1) selon la revendication 6 ou 7, caractérisé en ce que les émetteur/récepteur (3) sont intégrés dans le profilé (1).
  9. Profilé (1) selon la revendication 6, 7 ou 8, caractérisé en ce qu'il est prévu pour chaque émetteur/récepteur (3) une liaison par câble protégée dans le profilé pour la transmission de la tension d'alimentation et du signal.
  10. Profilé (1) selon la revendication 6, 7 ou 8, caractérisé en ce que chaque émetteur/récepteur (3) possède une alimentation en courant, notamment un accumulateur, et un enregistreur de signal ou des moyens de transmission sans fil.
EP13166376.7A 2012-05-08 2013-05-03 Procédé d'assurance-qualité pour la réalisation de pieux et profil ouvert prévu à cet effet Not-in-force EP2662499B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012104009.5A DE102012104009B4 (de) 2012-05-08 2012-05-08 Qualitätssicherungsverfahren zum Erstellen von Pfählen sowie offenes Profil dafür

Publications (3)

Publication Number Publication Date
EP2662499A2 EP2662499A2 (fr) 2013-11-13
EP2662499A3 EP2662499A3 (fr) 2016-03-09
EP2662499B1 true EP2662499B1 (fr) 2017-03-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13166376.7A Not-in-force EP2662499B1 (fr) 2012-05-08 2013-05-03 Procédé d'assurance-qualité pour la réalisation de pieux et profil ouvert prévu à cet effet

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EP (1) EP2662499B1 (fr)
DE (1) DE102012104009B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105040747B (zh) * 2015-04-21 2017-06-13 浙江大学 一种用于桩柱结构物局部冲刷试验的实时监测装置及方法
CN111158043B (zh) * 2020-01-07 2021-09-17 中南大学 一种成孔灌注桩桩底隐患检测系统和检测方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1141245B (de) * 1961-11-22 1962-12-20 Prakla Gmbh Verfahren und Vorrichtung zur Ermittlung des Zustandes von Bohrloch- oder Schachtauskleidungen
NL8100250A (nl) * 1980-03-13 1981-10-01 Halliburton Co Akoestisch logstelsel met zwaai-energiebron.
ATE385537T1 (de) * 2004-12-20 2008-02-15 Schlumberger Technology Bv Bestimmung der impedanz eines hinter einer futterrohrung sich befindenden materials durch kombination zweier sätze von ultraschallmessungen

Also Published As

Publication number Publication date
DE102012104009B4 (de) 2016-09-22
EP2662499A3 (fr) 2016-03-09
DE102012104009A1 (de) 2013-11-14
EP2662499A2 (fr) 2013-11-13

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