EP3771774A1 - Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux - Google Patents

Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux Download PDF

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Publication number
EP3771774A1
EP3771774A1 EP20187455.9A EP20187455A EP3771774A1 EP 3771774 A1 EP3771774 A1 EP 3771774A1 EP 20187455 A EP20187455 A EP 20187455A EP 3771774 A1 EP3771774 A1 EP 3771774A1
Authority
EP
European Patent Office
Prior art keywords
anchor
reinforcement cage
drill head
ring
base plate
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.)
Granted
Application number
EP20187455.9A
Other languages
German (de)
English (en)
Other versions
EP3771774C0 (fr
EP3771774B1 (fr
Inventor
Daniel Leuenberger
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.)
Marti Gruendungstechnik AG
Original Assignee
Marti Gruendungstechnik AG
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 Marti Gruendungstechnik AG filed Critical Marti Gruendungstechnik AG
Publication of EP3771774A1 publication Critical patent/EP3771774A1/fr
Application granted granted Critical
Publication of EP3771774C0 publication Critical patent/EP3771774C0/fr
Publication of EP3771774B1 publication Critical patent/EP3771774B1/fr
Active 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
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/22—Placing by screwing down
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
    • E04C5/0618—Closed cages with spiral- or coil-shaped stirrup rod
    • 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
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
    • E02D9/005—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof removing the top of placed piles of sheet piles

Definitions

  • the present invention relates in a first aspect to a drilling head for a drilling unit for the production of piles, in particular in-situ concrete piles, in an insufficiently load-bearing subsoil.
  • the present invention relates to a drill head which comprises an anchor, by means of which it is ensured that a reinforcement cage required for the production of the pile in an insufficiently load-bearing ground is held in a position that is advantageous for the load-bearing capacity.
  • the present invention also relates to a corresponding reinforcement cage which can interact with the anchor of a drill head according to the invention.
  • the present invention also relates to a reinforcement cage which enables simple excavation work for the subsoil.
  • the present invention relates to a drilling unit comprising a drill head according to the invention and a reinforcement cage according to the invention.
  • piles are used to found this building, for example. These transfer the building loads to lower, load-bearing soil layers.
  • a steel pipe hereinafter called a drill pipe
  • the drill head and drill pipe are connected to one another so that they cannot rotate.
  • this drill pipe is screwed into the ground to the required depth under high vertical pressure, the soil material being displaced by the volume of the drill pipe.
  • a prefabricated Pile reinforcement a so-called reinforcement cage
  • the drill pipe is then withdrawn.
  • the drill head becomes detached from the drill pipe and remains in the subsoil.
  • the present invention is therefore based on the object of overcoming the aforementioned disadvantages and proposing a drill head and a reinforcement cage by means of which high-quality piles, in particular in-situ concrete piles, can be produced in a poorly stable subsoil.
  • Another object of the present invention is to provide a reinforcement cage, especially a reinforcement cage top end to propose, which simplifies the excavation work considerably.
  • a drill head comprising a base plate and a drill bit attached to the base plate, the drill bit being arranged essentially perpendicular to the base plate, wherein a borehole can be drilled in a subsoil by means of the drill bit
  • the drill head having an comprises anchor attached to the base plate, the anchor being arranged substantially perpendicular to the base plate and in the opposite direction to the drill bit, the anchor comprising an anchor body connected to the base plate and an anchor point, the anchor point being at least partially wider than the anchor body, and wherein Locking means for locking an anchor ring or an anchor ball, which is arranged coaxially to and at one end of a reinforcement cage, are formed at the transition from the anchor tip to the anchor body.
  • a drill head according to the invention it is ensured that, thanks to the locking means of the anchor, a reinforcement cage is held within the hole drilled with the drill head and therefore that a high-quality pile, in particular an in-situ concrete pile, can be produced.
  • a drill head according to the invention specifically prevents the basket from being able to move away from the drill head.
  • the locking means take the form of locking edges. Thanks to the locking edges, which form a kind of hook, a Anchor ring, an anchor ball or any other suitable means of a reinforcement cage can be locked. This can prevent the basket from being able to move away from the drill head.
  • the locking means take the form of a locking opening. Thanks to the hook-shaped anchor with the locking opening, an anchor ring, an anchor ball or any other suitable means of a reinforcement cage can be locked. This can prevent the basket from being able to move away from the drill head.
  • the drill head is configured in such a way that a substantially cylindrical drill pipe can be attached to the base plate coaxially to the drill bit and around the anchor. This means that liquid concrete can be poured into the drill pipe, which considerably simplifies the production of a high-quality in-situ concrete pile.
  • the drill bit comprises a first drill head plate and a second drill head plate, which are arranged perpendicular to one another and to the base plate.
  • the first drilling plate and the second drilling plate are exchangeable. This means that the shape, size and material of the drilling plates can be selected, for example, according to the specific soil conditions.
  • the anchor is exchangeable. This means that the shape and size of the anchor can be selected, for example, according to the specific reinforcement cage.
  • a reinforcement cage comprising a cylindrical reinforcement cage fitting, the reinforcement cage comprising an anchor ring or an anchor ball for locking the reinforcement cage on a drill head, the anchor ring and / or the anchor ball being coaxial with and are arranged at one end of the cylindrical reinforcement basket fitting, and wherein the anchor ring and / or the anchor ball are designed such that they are deformable.
  • the reinforcement cage can interact, for example, with the anchor of a drill head according to the invention. Thanks to the anchor ring and / or the anchor ball, the reinforcement cage is held in the borehole, which enables the production of a high-quality pile, in particular an in-situ concrete pile.
  • the diameter of the anchor ring or the anchor ball can be increased. This allows the anchor ring or anchor ball to be attached to the anchor point of a drill head and to hold the reinforcement cage.
  • the probation cage comprises a split ring which is arranged coaxially to the cylindrical reinforcement basket fitting and in relation to the anchor ring or the anchor ball at the opposite end of the cylindrical reinforcement basket, the split ring being loosely attached to the Reinforcement cage is attached in such a way that the split ring can move in the radial and / or in the axial direction with respect to the longitudinal axis of the cylindrical reinforcement basket fitting.
  • a reinforcement cage comprising a cylindrical reinforcement cage fitting, the reinforcement cage comprising a split ring which is arranged coaxially to and at one end of the cylindrical reinforcement cage fitting, the split ring being loosely attached to the reinforcement cage that the split ring can move in the radial and / or in the axial direction with respect to the longitudinal axis of the cylindrical reinforcement basket fitting.
  • the reinforcement cage comprises an anchor ring or an anchor ball for locking the reinforcement cage on a drill head, the anchor ring and / or the anchor ball being coaxial with the cylindrical reinforcement cage fitting and with reference to the Split ring are arranged at the opposite end of the cylindrical reinforcement basket fitting, the anchor ring and / or the anchor ball being designed such that they are deformable.
  • the reinforcement cage can, for example, interact with the anchor of a drill head according to the invention.
  • the anchor ring the reinforcement cage is held in the borehole, which enables the production of a high-quality pile, especially an in-situ concrete pile.
  • the diameter of the anchor ring or the anchor ball can be increased. This allows the anchor ring or anchor ball to be attached to the anchor point of a drill head and to hold the reinforcement cage.
  • the objectives of the present invention are also achieved by a drilling unit comprising a drill head according to the invention and a reinforcement cage according to the invention.
  • a drilling unit according to the invention With a drilling unit according to the invention, high-quality piles, in particular in-situ concrete piles, can be easily produced.
  • the drilling unit ensures on the one hand that the drill head and the reinforcement cage work together in such a way that the reinforcement cage cannot move away from the drill head and is thus held in the borehole, but also that a predetermined breaking point is formed in the pile, which considerably simplifies the completion of the pile. Thanks to the predetermined breaking point, the unreinforced part of the pile no longer has to be separated from the rest of the pile in a specially designed work step. Thanks to the predetermined breaking point, this part of the pile is automatically separated from the rest of the pile during excavation.
  • the Figures 1a to 1c show a drill head 1 according to a first preferred embodiment of the present invention.
  • This drill head 1 comprises a base plate 2, which is circular, and a drill tip 3, which is intended for the displacement of the soil during drilling.
  • the drill tip consists essentially of two drill head plates 3a and 3b arranged perpendicular to one another.
  • This first drill head plate 3a and second drill head plate 3b are configured in such a way that they can be connected to one another and to the base plate 2 in a rotationally secure manner.
  • the drill head plates 3a and 3b are advantageously attached to the base plate 2 such that they can be replaced.
  • the shape, size and number of the drill head plates 3a and 3b can thus be specifically selected based on the subsoil, the depth, etc.
  • the drill bit 3 also has a spiral plate 3c which is arranged in a spiral around the axis of symmetry A of the drill head 1.
  • the drill head plates 3a and 3b are designed in such a way that the anchor supports 3a 'and 3b' of the plates 3a and 3b protrude above the base plate 2.
  • the drill head 1 further comprises an anchor 4, which can advantageously be fastened to the base plate 2 in a rotationally secure manner by means of the anchor supports 3a 'and 3b' and can be separated from it again.
  • an anchor 4 which can advantageously be fastened to the base plate 2 in a rotationally secure manner by means of the anchor supports 3a 'and 3b' and can be separated from it again.
  • the armature 4 is actually attached to the base plate 2. It is, for example, conceivable within the scope of the present invention that the anchor 4 and the base plate 2 are welded together.
  • the armature 4 has an armature tip 4a and an armature body 4b.
  • the anchor tip 4a has essentially the shape of a truncated triangle, the base of this triangle being wider than the anchor body 4b.
  • the anchor point 4a and the anchor body 4b together form a type of arrow.
  • Due to the arrow-shaped shape of the armature 4, the armature locking edges 4c are formed between the armature tip 4a and the armature body 4b.
  • the anchor tip 4 a has a width that is smaller than the diameter of the base plate 2.
  • a drill pipe 10 (see Figure 2 ) are attached to the base plate 2 and around the anchor 4.
  • the drill pipe 10 can advantageously be removably attached to the base plate 2 by means of a locking ring 2 ′.
  • a drill head 1 For the production of a pile, for example an in-situ concrete pile, the first step (step I in Figure 4 ) drilled a hole in the ground 5 by means of the drill head 1 together with the drill pipe 10 (see also Figures 2 and 3 ).
  • a reinforcement cage 20 is guided through the drill pipe 10 until it comes into contact with the anchor point 4a of the drill head 1.
  • the reinforcement cage 20 provides the pile reinforcement and is indispensable in many cases, especially in the case of poorly stable soil 5.
  • the reinforcement cage 20 has an anchor ring 21 which is configured in such a way that in the third step III it extends over the triangle of Armature tip 4a can spread.
  • the anchor ring 21 can for example consist at least partially of an elastic material or be designed in such a way that it has a certain elasticity. After the anchor ring 21 has passed the base of the anchor tip 4a, it can again assume its original shape. The diameter of the anchor ring 21 is selected such that the reinforcement cage 20 is locked by means of the anchor locking edge 4c and, due to the nature of the soil 5, can no longer come out of the borehole.
  • the drill pipe 10 is filled with liquid concrete. Thereafter and preferably before the start of the concrete setting process, the drill pipe 10 is separated from the drill head 1 in step V and pulled out of the borehole.
  • FIG. 7 shows a second preferred embodiment of a drill head 50 according to the invention.
  • the drill head 50 differs from the drill head 1 (see FIG Figures 1a to 1c ) only in the form of the armature 54.
  • the armature 54 has an armature tip 54a and an armature body 54b.
  • the anchor tip 54a has essentially the shape of a bisected triangle, the base of this triangle being wider than the anchor body 54b.
  • the armature 54 has a locking opening 54c between the armature tip 54a and the armature body 54b.
  • the anchor tip 54a and the anchor body 54b thus form kind of hack together. It is important to note that in this embodiment the tip of the bisected triangle of the anchor tip 54a is not located in the middle but shifted with respect to the center of the base plate 2.
  • Figure 7 also shows the lower end of a reinforcement cage 60 according to a second embodiment of the present invention.
  • the reinforcement cage 60 has an anchor ball 61 instead of an anchor ring 21.
  • the anchor ball 61 advantageously made from a steel strand, is attached to two longitudinal bars of the reinforcement cage 60, which are slightly curved at the bottom. Since the uppermost point of the anchor point 51a of the anchor 54 lies eccentrically above the base plate 2 and in the tube, when the anchor ball 61 is lowered, the latter is forced to slide down on the inclined edge of the anchor point 54a and thereby deform. If the anchor ball 61 has reached the lowest point of the anchor tip 54a, it will open against the locking opening 54c.
  • the anchor ball 61 By pulling up the reinforcement cage 60 with the anchor ball 61 secured against tension, the anchor ball 61 is anchored in the anchor 54. Since the anchor ball 61 consists of two cable loops 61a, 61b lying at right angles to each other, a cable always finds the locking opening 54c.
  • the soil 5 is excavated around the pile 40.
  • a part of the in-situ concrete pile 40 protrudes from the ground 5.
  • the protruding part of the in-situ concrete pile 40 consists of a part 41a reinforced with the reinforcement cage 30 and an unreinforced part 41b.
  • the unreinforced part 41b must be separated from the rest of the in-situ concrete pile 40. This last step is carried out manually in the prior art in order not to damage the in-situ concrete pile and is therefore very complex and expensive.
  • the present invention also relates, in a third aspect, to a reinforcement cage 30 which enables simple excavation, especially which simplifies the separation of the pile parts 41a and 41b.
  • the reinforcement cage 30 according to the second aspect of the present invention has a split ring 32 which is attached to the armature 33 of the reinforcement cage 30.
  • the split ring 32 is not rigidly attached to the reinforcement cage 30. Rather, he will and preferably only held by the reinforcement cage 30.
  • the split ring 32 can move relative to the reinforcement cage 30 in a certain area in the directions C and D (see FIG Figure 6 ) move.
  • the split ring can be attached to the reinforcement cage 30, for example, by means of threaded pins 34 and nuts 35.
  • the split ring 32 can move more or less in direction D.
  • the holes of the split ring 32 may have a shape that allows the split ring to move in the C direction.
  • the holes in the split ring 32 are advantageously designed as elongated holes.
  • the split ring 32 represents a predetermined breaking point S of the pile (see FIG Figures 5a and 5b ). Thanks to the predetermined breaking point S, the pile 40 breaks "automatically" during the excavation work and the unreinforced part 41b of the pile 40 no longer has to be separated from the pile manually and at great expense.
  • the reinforcement cage 30 can be provided with or without an anchor ring 21. Even if in the Figures 5a to 5c and 6 the reinforcement cage 30, analogous to the reinforcement cage 20, has an anchor 31, it is of course conceivable to provide a reinforcement cage 30 which does not have an anchor ring 21.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Architecture (AREA)
  • Piles And Underground Anchors (AREA)
EP20187455.9A 2019-07-30 2020-07-23 Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux Active EP3771774B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00967/19A CH716469A1 (de) 2019-07-30 2019-07-30 Bohrkopf, Bewehrungskorb und Bohreinheit zur Herstellung von Pfählen.

Publications (3)

Publication Number Publication Date
EP3771774A1 true EP3771774A1 (fr) 2021-02-03
EP3771774C0 EP3771774C0 (fr) 2023-12-06
EP3771774B1 EP3771774B1 (fr) 2023-12-06

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EP20187455.9A Active EP3771774B1 (fr) 2019-07-30 2020-07-23 Tête de forage, cage d'armature et unité de forage destinée à la fabrication de pieux

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EP (1) EP3771774B1 (fr)
CH (1) CH716469A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114482028A (zh) * 2022-03-18 2022-05-13 中建三局集团有限公司 一种微型灌注桩反循环施工装置及其施工方法
CN114775586A (zh) * 2022-04-20 2022-07-22 深圳市工勘岩土集团有限公司 一种基坑逆作法旋挖扩底、全回转定位施工方法
EP4227467A1 (fr) * 2022-02-09 2023-08-16 Marti Gründungstechnik AG Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB114221A (en) * 1917-04-13 1918-03-28 William John Stewart Improvements relating to Reinforced Concrete Piles.
JPS5927026A (ja) * 1982-08-06 1984-02-13 Hasegawa Komuten Co Ltd 場所打ち杭の杭頭処理工法
JPS59228523A (ja) * 1983-06-10 1984-12-21 Tobishima Kensetsu Kk 杭頭処理工法
JPS6378918A (ja) * 1986-09-22 1988-04-09 Yukio Matsumoto 回転軸の先端に角錐ビツトを装着した掘進装置
JPH07197458A (ja) * 1995-01-27 1995-08-01 Matsumuragumi:Kk 基礎杭の施工法
AU723991B2 (en) * 1997-06-19 2000-09-07 Peters, Patricia Evelyn Methods of and apparatus for forming in-ground columns
EP2146046A1 (fr) * 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
US20100101163A1 (en) * 2008-10-28 2010-04-29 Juan Marcos Cuevas Modular elements for structural reinforcement
CN204343285U (zh) * 2014-11-13 2015-05-20 中交隧道工程局有限公司 一种桩基础桩头整体破除结构
CN109778843A (zh) * 2019-01-29 2019-05-21 中建八局轨道交通建设有限公司 灌注桩混凝土灌注顶面控制及桩头拔除施工方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354657A (en) * 1965-05-03 1967-11-28 Lee A Turzillo Method for installing anchoring or supporting columns in situ
US3698144A (en) * 1970-12-03 1972-10-17 Patrick Joseph Stratton Post anchor
FR2079136A5 (fr) * 1970-12-15 1971-11-05 Frankignoul Cie Internal
KR100385769B1 (ko) * 2000-06-13 2003-05-28 주식회사 이금산업 항 매설방법
KR20110105118A (ko) * 2010-03-18 2011-09-26 박가영 지주봉 고정구

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB114221A (en) * 1917-04-13 1918-03-28 William John Stewart Improvements relating to Reinforced Concrete Piles.
JPS5927026A (ja) * 1982-08-06 1984-02-13 Hasegawa Komuten Co Ltd 場所打ち杭の杭頭処理工法
JPS59228523A (ja) * 1983-06-10 1984-12-21 Tobishima Kensetsu Kk 杭頭処理工法
JPS6378918A (ja) * 1986-09-22 1988-04-09 Yukio Matsumoto 回転軸の先端に角錐ビツトを装着した掘進装置
JPH07197458A (ja) * 1995-01-27 1995-08-01 Matsumuragumi:Kk 基礎杭の施工法
AU723991B2 (en) * 1997-06-19 2000-09-07 Peters, Patricia Evelyn Methods of and apparatus for forming in-ground columns
EP2146046A1 (fr) * 2008-07-15 2010-01-20 Marti Gründungstechnik AG Tête de forage pour un dispositif de forage destiné à la création de trous de forage dans un sol de fondation insuffisamment portant
US20100101163A1 (en) * 2008-10-28 2010-04-29 Juan Marcos Cuevas Modular elements for structural reinforcement
CN204343285U (zh) * 2014-11-13 2015-05-20 中交隧道工程局有限公司 一种桩基础桩头整体破除结构
CN109778843A (zh) * 2019-01-29 2019-05-21 中建八局轨道交通建设有限公司 灌注桩混凝土灌注顶面控制及桩头拔除施工方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4227467A1 (fr) * 2022-02-09 2023-08-16 Marti Gründungstechnik AG Mèche de forage pour un dispositif de forage permettant de créer des trous de forage dans un terrain de fondation
CN114482028A (zh) * 2022-03-18 2022-05-13 中建三局集团有限公司 一种微型灌注桩反循环施工装置及其施工方法
CN114482028B (zh) * 2022-03-18 2023-09-08 中建三局集团有限公司 一种微型灌注桩反循环施工装置及其施工方法
CN114775586A (zh) * 2022-04-20 2022-07-22 深圳市工勘岩土集团有限公司 一种基坑逆作法旋挖扩底、全回转定位施工方法

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Publication number Publication date
EP3771774C0 (fr) 2023-12-06
EP3771774B1 (fr) 2023-12-06
CH716469A1 (de) 2021-02-15

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