EP1793045A1 - Kralle zur Befestigung an dem Kopf eines Mikropfahls und Zugtestvorrichtung mit einer solchen Kralle - Google Patents

Kralle zur Befestigung an dem Kopf eines Mikropfahls und Zugtestvorrichtung mit einer solchen Kralle Download PDF

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Publication number
EP1793045A1
EP1793045A1 EP05292619A EP05292619A EP1793045A1 EP 1793045 A1 EP1793045 A1 EP 1793045A1 EP 05292619 A EP05292619 A EP 05292619A EP 05292619 A EP05292619 A EP 05292619A EP 1793045 A1 EP1793045 A1 EP 1793045A1
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EP
European Patent Office
Prior art keywords
micropile
claw
head
reservation
installation
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Withdrawn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
EP05292619A
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English (en)
French (fr)
Inventor
Jean-Marie Denis
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.)
Jean-Marie Renovation
Original Assignee
Jean-Marie Renovation
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Filing date
Publication date
Application filed by Jean-Marie Renovation filed Critical Jean-Marie Renovation
Publication of EP1793045A1 publication Critical patent/EP1793045A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/56—Screw piles

Definitions

  • the present invention relates to the technical field of foundation piles.
  • foundation refers to all the underground structures that make up the base and the stable base of a construction and distribute the loads of this construction on the natural ground or carry these loads on the natural ground or carry these loads on the ground. hard ground of sitting.
  • H / B ratio where B is the width of the foundation and H the seat depth, there are special foundations, for which H / B is less than 6, for example for soles and rafts, and deep foundations, for which H / B is greater than 6, eg for bars, wells and piles.
  • the beaten piles are usually made of steel (profile H with reinforced core or palpieu) or of prefabricated concrete and are set up by threshing with backflow from the ground.
  • Dark piles can be made of reinforced concrete, prefabricated, or coffered in progress, or even in steel (H profile with reinforced core or palpieu) and are put in place with discharge of the soil.
  • the drilled piles are made of reinforced concrete cast in place in a borehole. When the cohesion of the ground allows it, drilling is done without protection (simple bored pile).
  • a metal tube protects the bore (cased drilled pile) or a drilling mud is injected (pile drilled with mud). The drilling is done by auger or roto percussion.
  • the beaten or drilled piles can be of the high-pressure injected type, an injection system composed of cuffed tubes allowing the injection of a grout of sealing in the ground.
  • the invention relates more particularly to micropiles.
  • Micropiles are used for underpinning, soil reinforcement (stability of slopes or embankments and protection of underground structures during excavation work), and new foundations.
  • micropile technique was developed in 1952 by the company Fondelile under the direction of the Italian engineer Lizzi. These first piles were drilled and sealed to the ground by a mortar. These products have been used in Italy under the name of "piles piles".
  • micropiles are called minipiles, micropiles, root piles, needle batteries. They are called mikropfahl, verpresspfahle, wurzelphale in German.
  • a micropile is a pile having a diameter of less than 300 mm for the piles set. place without backflow from the ground (piles bored or molded in place), and less than 150 mm for the piles set up with backflow of the ground (dark piles, thrown or beaten).
  • the first table concerns micropiles drilled.
  • the second table concerns dark micropiles.
  • Drilling method Reinforcement type Injection method Type of grout options Rotary Drilling Rotor Drilling Clamshell Bucket or Valve Reinforcing cage Gravity injection, concreting Grout, mortar or concrete tubing One-pass injection with temporary casing Grout or concrete Supporting element Gravity injection Grout or mortar One-shot injection with temporary casing, carrier, or cuffed tube Grout or mortar Injection in several passes with a tube with cuffs grout Permanent tubing (with or without reinforcement cage) Gravity injection or concreting Grout, mortar or concrete Extended base Drilling with continuous hollow auger Reinforcing cage Concreting by the hollow stem of the auger Grout, mortar or concrete Type / Method Materials / Tubing Section / Frame of the micropile Option / Injection Prefabricated Reinforced concrete steel or cast iron Full or open tube, profiles Injection around the barrel Closed Tube Filling with grout, mortar or concrete with or without injection around the barrel Molded in
  • micropiles of foundation conventionally designate piles of modest cross-section, typically of diameter less than 250 mm, set up with tools of small, light and manageable dimensions, in particular for underpinning.
  • micropiles are conventionally bonded to the structure either by sealing with anti-shrinkage mortar, in the existing foundations, or by a distribution plate embedded in a reinforced concrete header.
  • Drilled micropiles are quite commonly used for undercuts in a small space, in the case of individual habitats in particular. Micropiles are also used in groups (set of vertical micropiles) or in networks (set of vertical and inclined micropiles) for soil reinforcement.
  • the document EP-0954645 on behalf of Target Fixings, describes a pile having a plurality of helical outer fins, substantially along the entire length of the pile, this pile having an outside diameter of at least 25 mm, at least one of the fins having a wedge-shaped cross section.
  • the pile After making a pre-hole, the pile is put in place by hydraulic hammering. or pneumatic, the wings of the pile causing its rotation in the ground, during threshing. No binder injection is performed or possible during the setting up of the pile described in the document EP-0954645 this pile being solid, for example molded, or else hollow but closed and filled with a material such as resin, or polymeric material, before being placed in the ground.
  • the Applicant has developed micropiles with a central core, injectable or not, having found that the piles described in the document EP 0 954 645 did not achieve tearing strengths required in some applications.
  • micropiles of the plaintiff are set up by embedding elements of about a meter in length, these elements being cast aluminum.
  • the elements are assembled using a stainless steel dowel.
  • the geometry of the micropiles of the plaintiff is such that they screw themselves in the ground, under the effect of a hammer, without vibration, and this by compressing the surrounding ground.
  • micropile massive axial core gives the pile a high resistance to buckling, unlike for example the pile described in the document US 2,232,990 to 1943 .
  • the aim of the invention is to provide tools for laying and monitoring the resistance to pulling out micropiles.
  • the invention relates, in a first aspect, to a claw for holding a helical micropile head, this claw comprising two half claws mounted articulated together and delimiting, once closed, an opening whose shape corresponds to the external contour of the helical head of micropile.
  • the claw is elaborated in bronze.
  • each half claw is provided with at least one through hole of a locking screw bearing against the micropile head.
  • the invention relates to a test device for tearing a helical micropile, this installation comprising two substantially parallel flanges, secured by spacers, a device for pulling the micropile being secured to the upper flange. and being mounted on the head of the micropile by a connecting member, this installation comprising a claw for holding the micropile head of the type presented above, this claw being provided with at least one projection abutting against a solidarity support two flanges, so as to stop the rotation of the micropile during the measurement of the tear resistance of this micropile.
  • the linking member 1 is a solid body comprising an upper part 2 for mounting to a striking tool (not represented) and a lower part 3 provided with a reservation 4. This reservation is against the imprint (or hollow mold) of the upper part of the micropile.
  • the striking tool is for example a pneumatic hammer, or a roto percussion tool.
  • the striking tool is advantageously manual.
  • This member 1 is in the general form of a body of revolution, whose axis of revolution corresponds substantially to the axis of slenderness and driving of the pile.
  • the upper part of the member 1 is provided with a through hole 1a, this hole 1a allowing the passage of a radial rod.
  • This radial rod (not shown) allows the operator to facilitate the rotation of the micropile in the soil, during its depression.
  • the upper part of the member 1 is also provided with an axial reservation, this reservation receiving the threaded bolts connecting the pile sections to each other.
  • the axial reservation is, of course, open at the bottom of the reservation 4.
  • the connecting member 1 is made of metal alloy such as steel, the reservation 4 being obtained by electroerosion.
  • the member 1, called bell in the terminology of the applicant, is made of 35NCD16 steel.
  • the member 1 is made of cast aluminum.
  • the dimensions of this body are as follows: height 300 mm, diameter 140 mm.
  • the height of the reservation 4 is, as an indication, 80 mm, the diameter of the through hole being 20 mm.
  • the upper end face 6 of the member 1 is curved.
  • the radius of curvature of this upper face is about 72 mm.
  • the pile 10 shown in this figure 2 comprises an upper end portion 11 with a helical shape adapted and shaped to be housed, to the functional clearance, in the reservation 4 of the member 1.
  • the pile 10 has a lower portion 12. the embodiment shown, this lower portion 12 is smooth and cylindrical. As an indication, the upper part of the pile extends over a height of 300 mm, the lower part extending over a height of 1000 mm, the diameter of the lower part being 40 mm, for the piles of 52 and 65 mm for the piles of 84, ie piles whose diameter is inscribed in a circle of 100 mm.
  • the pile is provided with an axial thread 14 at both ends.
  • the pile is made of cast aluminum type AS7GY20.
  • a micropile 20 has been driven into the ground, only the upper part of this micropile being visible in FIG. 3. This upper part is helicoidal, as has been described with reference to FIGS. 1 and 2.
  • a claw 21 is mounted on the upper part of the micropile. The structure of this claw is shown in FIGS. 4 and 5. This claw is placed between two flanges 22, 23 of a micropile peel test installation.
  • these two flanges are substantially planar and parallel to each other.
  • the lower flange 23 rests on the ground 24.
  • Rigid bars 25, 26, 27, substantially parallel, extend substantially perpendicularly to the two flanges 22, 23 and between these two flanges, and connect them.
  • the flanges, or plates 22, 23 are made of steel, for example NCD 16, the bars 25, 26, 27 forming spacers being welded to the flanges 22, 23.
  • the lower flange 23 is provided with a through hole of the micropile head.
  • This jack comprises a shoe 31 mounted on the upper plate flange 22.
  • This shoe 31 is mounted transversely to the rod 32 of the cylinder 30.
  • the body 33 of the cylinder 30 has a projection 34, extending radially relative to the rod 32.
  • This projection 34 is housed in support in the upper part of a shaft 35.
  • the shaft 35 is secured to the head of the micropile, and in a removable manner.
  • the tree is provided with a reservation similar to that referenced 4 in FIG.
  • the claw 21 is mounted between the flanges 22, 23. This claw 21 is provided with projections 40 bearing against at least one rigid bar 40a, these rigid bars 41 being substantially parallel to the struts 25, 26, 27 and disposed near the micropile head.
  • the claw 21 defines an opening whose shape corresponds to the outer contour of the micropile helical head.
  • Each half claw is provided with at least one through hole of a locking screw 47, 48 bearing against the micropile head.
  • the claw is bronze, type CUSN12Y20.
  • the invention finds application in the depression and the control of the tear resistance of micropiles comprising an axial core and at least a substantially helical projection, this core being provided or not with an injection well.
  • the invention finds particular application in the depression and the control of the tear resistance of a micropile axially central core and comprising three helical protrusions, the projections being in particular substantially identical and equidistant, and for example of section transverse wedge.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (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)
  • Piles And Underground Anchors (AREA)
EP05292619A 2005-10-18 2005-12-08 Kralle zur Befestigung an dem Kopf eines Mikropfahls und Zugtestvorrichtung mit einer solchen Kralle Withdrawn EP1793045A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0510611A FR2892136B1 (fr) 2005-10-18 2005-10-18 Griffe de maintien de tete de micropieu, installation de test a l'arrachement comprenant une telle griffe

Publications (1)

Publication Number Publication Date
EP1793045A1 true EP1793045A1 (de) 2007-06-06

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ID=36928333

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Application Number Title Priority Date Filing Date
EP05292619A Withdrawn EP1793045A1 (de) 2005-10-18 2005-12-08 Kralle zur Befestigung an dem Kopf eines Mikropfahls und Zugtestvorrichtung mit einer solchen Kralle

Country Status (2)

Country Link
EP (1) EP1793045A1 (de)
FR (1) FR2892136B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103112091A (zh) * 2013-01-24 2013-05-22 盐城市双强管桩有限公司 预应力钢筋混凝土空心桩内螺纹加工设备
CN114808953A (zh) * 2022-04-24 2022-07-29 北京京投交通枢纽投资有限公司 扩底式预应力复合锚索抗拔桩、制备方法及设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101852032B (zh) * 2010-06-09 2012-03-07 山东建筑大学 可移动隔震建筑物及其移动方法
CN106638593A (zh) * 2016-12-30 2017-05-10 中冶沈勘工程技术有限公司 锚杆连接结构及锚压结构
CN109870298A (zh) * 2019-03-29 2019-06-11 西安工业大学 一种模拟微型桩刚性连接结构抗滑性能的评价方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2232990A (en) 1938-07-15 1941-02-25 Eastman Kodak Co Preparation of oxycellulose
US4911581A (en) * 1986-05-21 1990-03-27 Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co Pre-cast concrete pile and method and apparatus for its introduction into the ground
JPH1018797A (ja) * 1996-07-08 1998-01-20 Tokyu Constr Co Ltd 異形棒材の打設用治具
EP0954645A1 (de) 1997-01-14 1999-11-10 Target Fastenings Limited Pfahl und verfahren zum einrammen des pfahls
US6363776B1 (en) * 1999-11-12 2002-04-02 Gary L. Reinert, Sr. Pile testing reaction anchor apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2232990A (en) 1938-07-15 1941-02-25 Eastman Kodak Co Preparation of oxycellulose
US4911581A (en) * 1986-05-21 1990-03-27 Delmag Maschinenfabrik Reinhold Dornfeld Gmbh & Co Pre-cast concrete pile and method and apparatus for its introduction into the ground
JPH1018797A (ja) * 1996-07-08 1998-01-20 Tokyu Constr Co Ltd 異形棒材の打設用治具
EP0954645A1 (de) 1997-01-14 1999-11-10 Target Fastenings Limited Pfahl und verfahren zum einrammen des pfahls
US6264403B1 (en) * 1997-01-14 2001-07-24 Target Fixings Limited Pile and method of driving a pile
US6363776B1 (en) * 1999-11-12 2002-04-02 Gary L. Reinert, Sr. Pile testing reaction anchor apparatus and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103112091A (zh) * 2013-01-24 2013-05-22 盐城市双强管桩有限公司 预应力钢筋混凝土空心桩内螺纹加工设备
CN103112091B (zh) * 2013-01-24 2014-05-21 盐城市双强管桩有限公司 预应力钢筋混凝土空心桩内螺纹加工设备
CN114808953A (zh) * 2022-04-24 2022-07-29 北京京投交通枢纽投资有限公司 扩底式预应力复合锚索抗拔桩、制备方法及设备
CN114808953B (zh) * 2022-04-24 2023-12-12 北京京投交通枢纽投资有限公司 扩底式预应力复合锚索抗拔桩、制备方法及设备

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Publication number Publication date
FR2892136B1 (fr) 2008-02-01
FR2892136A1 (fr) 2007-04-20

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