EP1625258A1 - Procede de construction de pieux - Google Patents

Procede de construction de pieux

Info

Publication number
EP1625258A1
EP1625258A1 EP04732669A EP04732669A EP1625258A1 EP 1625258 A1 EP1625258 A1 EP 1625258A1 EP 04732669 A EP04732669 A EP 04732669A EP 04732669 A EP04732669 A EP 04732669A EP 1625258 A1 EP1625258 A1 EP 1625258A1
Authority
EP
European Patent Office
Prior art keywords
shaft
ground
tool
thread
pile
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Withdrawn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
EP04732669A
Other languages
German (de)
English (en)
Inventor
Clive 14 Palm Springs WILSON
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.)
Pass Jonathan Charles
Original Assignee
Pass Jonathan Charles
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 Pass Jonathan Charles filed Critical Pass Jonathan Charles
Publication of EP1625258A1 publication Critical patent/EP1625258A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds

Definitions

  • THIS INVENTION relates to a method of constructing a pile.
  • a pile is a vertical or steeply inclined, elongate, structural element, located beneath the ground surface, designed to resist forces imparted on to it by structures or by zones within the ground.
  • a ground anchor is a horizontal, or vertical, or moderately inclined, elongate, structural element located in the ground, designed to resist tensile forces imparted onto it by structures or by zones within the ground.
  • a liquid pile forming material is a liquid material of a type which can be placed in a pile cavity in the ground, which hardens to form a solid pile, typically a material such as concrete or cementitious grout.
  • a screwpile as referred to herein, is a pile or a ground anchor that includes a central shaft and a thread formation around the central shaft.
  • a tapping tool is a tool which includes a helical outer blade operatively driven by a drive shaft and which can be used to form a helical thread in the ground.
  • the leading end of such a tapping tool is the leading or deepest end during screwing in of the tool into the ground, and the trailing end is the opposite end thereof.
  • At least some known methods of constructing screwpiles cause substantial disturbance of ground around pile cavities, which reduces the stability of the ground. Also, in at least some known methods, substantial torque and thrust is required to drive a tapping tool screw-fashion into the ground.
  • the current invention aims to at least ameliorate these problems.
  • the method may include a step of, before forming of the thread, temporarily filling the shaft with a suitable liquid, such as a mixture of water and suspended clay particles (such as bentonite clay particles), and the like, along at least a part of its length, to prevent collapse of the surrounding ground.
  • a suitable liquid such as a mixture of water and suspended clay particles (such as bentonite clay particles), and the like, along at least a part of its length, to prevent collapse of the surrounding ground.
  • forming of the thread may be performed using a tapping tool that defines a passage permitting displacement of such liquid therethrough between the leading and trailing ends of the tool.
  • the shaft may be formed in the ground using a continuous flight auger.
  • the stem of the auger may define therethrough a longitudinal passage, which has an outlet at the leading end of the stem.
  • the method may include feeding, during extraction of the augerfrom the ground, the liquid through the passage for performing the required filling of the shaft.
  • the shaft may be formed in the ground by driving an elongate ground piercing tool into the ground and then extracting it from the ground.
  • a tool may be a solid or hollow elongate tool, e.g. a metal shaft.
  • the ground piercing tool may, e.g., be driven into the ground by imparting consecutive impact loads onto it.
  • the ground piercing tool may define therethrough a longitudinal passage, which has an outlet at the leading end of the tool.
  • the method may include feeding, during extraction of the tool from the ground, the liquid through the passage for performing the required filling of the shaft.
  • the thread may be formed in the ground by suitable driving of the tapping tool comprising coordinated rotation and linear displacement thereof, in a screwing fashion, into the ground along the shaft, the rate of rotation being one revolution per linear displacement equal to the pitch of the helical blade of the tool, the method including subsequent screwing out of the tool with its helical blade maintained in the thread already formed, until it exits the ground.
  • Screwing out of the tapping tool along that length of the shaft will similarly cause such liquid to again be displaced through the passage, but in the opposite direction, so that the liquid simultaneously enters and fills the helical thread in the ground around the shaft as it is again vacated by the retreating blade of the tapping tool during screwing out thereof.
  • the tapping tool may be driven by a drive shaft defining therethrough a longitudinal passage which is in communication with the part of the pile cavity below the tapping tool while it is being screwed out of the ground.
  • feeding of pile forming material into the shaft in the ground may be performed, via the drive shaft, during screwing out of the tapping tool.
  • the shaft in the ground may be filled with pile forming material from its deep end along at least a part of its length before forming of the thread around the said part.
  • the thread around the filled part of the shaft may be formed by screwing into the ground along this part a tapping tool defining therethrough a passage permitting displacement of such material between the leading and trailing ends of the tool.
  • the shaft in the ground may be formed using a continuous flight auger with a stem defining therethrough a longitudinal passage, which has an outlet at the leading end of the stem.
  • liquid pile forming material may be fed via the passage to perform the required filling of the shaft.
  • the shaft in the ground may be formed using a piercing tool defining therethrough a longitudinal passage, which has an outlet at the leading end of the tool.
  • a piercing tool defining therethrough a longitudinal passage, which has an outlet at the leading end of the tool.
  • liquid pile forming material may be fed via the passage to perform the required filling of the shaft.
  • Feeding of pile forming material into the shaft may be performed after forming of the thread.
  • the thread in the ground may be defined by means of a tapping tool which includes a hollow central shaft and a helical blade around the shaft, the shaft defining therethrough a passage between an aperture defined at its leading end and an aperture defined through its wall at the trailing end of the helical blade.
  • the pile cavity may be formed by means of a piling device including a continuous flight auger and a tapping tool defining attachment formations permitting the tool to be releasibly attached to the leading end of the auger in a collinear configuration, the tapping tool defining therethrough a passage permitting displacement of a liquid pile forming material therethrough between its leading and trailing ends.
  • a piling device including a continuous flight auger and a tapping tool defining attachment formations permitting the tool to be releasibly attached to the leading end of the auger in a collinear configuration, the tapping tool defining therethrough a passage permitting displacement of a liquid pile forming material therethrough between its leading and trailing ends.
  • the method may include placing at least one reinforcement member in the shaft formed in the ground.
  • the combination of the tool and a drive shaft driving it may define therethrough a longitudinal passage and the method may include at least partially inserting the reinforcement member into the longitudinal passage in the combination before the step of forming the thread around the shaft in the ground, inserting the reinforcement member in the shaft of the pile cavity during the said step, and screwing the tapping tool out of the ground whilst leaving the reinforcement member in the shaft.
  • the reinforcement member may be engaged with the leading end of the tapping tool via an engagement formation which, in the axial direction of the tool, permits displacement of the reinforcement member with respect to the tool only in a direction away from the drive shaft operatively driving the tool.
  • FIGS. 1 to 7 show a number of elevational diagrams illustrating a sequence of steps in a method of constructing a screwpile, in accordance with the invention
  • Figure 8 shows a diagrammatic axial section through a tapping tool used in the method of the invention
  • Figure 9 shows a diagrammatic axial section through a part of a piling device which may, alternatively, be used in the method of the invention.
  • Figures 10 to 12 show a number of elevational diagrams illustrating a sequence of steps for determining ground strength as an initial step in a method of constructing a screwpile, in accordance with the invention.
  • the strength of the ground in which the screwpile is to be constructed may be determined by any suitable method before its design and construction.
  • One such method is illustrated in Figures 10 to 12 and described below.
  • the required physical properties of such a screwpile may be designed based upon the strength of the ground so determined and the intended or specified design loads.
  • a continuous flight auger 10 is used to form a vertical shaft 12 in the ground 14.
  • the continuous flight auger 10 has a central hollow stem 16.
  • the stem 16 defines therethrough a longitudinal passage which has an aperture 18 at the operative bottom or leading end of the stem.
  • the shaft 12 will accommodate the central shaft of the screwpile being constructed.
  • the continuous flight auger 10 is being extracted from the shaft 12.
  • a liquid pile forming material in the form of a cementitious grout 20 is being fed via the passage in the stem 16 and the aperture 18 into the portion of the shaft 12 below the continuous flight auger 10, thus progressively filling the shaft 12 with cementitious grout 20 as the continuous flight auger 10 is extracted.
  • a shaft such as the shaft 12 may be formed in the ground by driving an elongate ground piercing tool into the ground and then extracting it from the ground.
  • a tool may be a solid or hollow elongate tool, e.g. a metal shaft. It may, e.g., be driven into the ground by imparting consecutive impact loads onto it. It may define therethrough a passage equivalent to that in the stem 16 of the auger 10.
  • the continuous flight auger 10 has been completely extracted from the shaft 12 and the shaft 12 has been filled with cementitious grout 20 along a part of its length, i.e. along a length 22.
  • a tapping tool 24 is positioned over the shaft 12 in coaxial alignment therewith.
  • the tapping tool 24 includes a hollow central shaft 26 and a thread-forming helical blade 28 around the shaft.
  • the central shaft 26 defines therethrough a passage 30 between an aperture 36 at its leading end and an aperture 38 defined through its wall 40 at the trailing end of the thread-forming blade 28.
  • the central shaft 26 defines at its trailing or upper end a formation 42 by means of which it is removably attached to a matching internally threaded coupler 44 of a drive shaft 46.
  • the drive shaft 46 defines therein a passage 50, which is continuous with the passage 30 of the central shaft 26.
  • a device 48 prevents rotation of the central shaft 26 with respect to the coupler 44.
  • steel reinforcement 54 has been inserted into the combination of the central shaft 26 and the shaft 46.
  • An engagement formation in the form of a transverse length of steel reinforcement 56 has been attached to the bottom of the steel reinforcement 54.
  • the length of steel reinforcement 56 abuts against the leading or bottom end of the tapping tool 24 and, as such, permits displacement of the steel reinforcement 54 with respect to the tapping tool 24 only in a direction away from the shaft 46.
  • a thread 58 has been formed in the ground 14 around the shaft 12 along the top half of its length whilst screwing the tapping tool 24 into the shaft.
  • the tapping tool 24 particularly is being driven by a suitable rig (not shown) which causes coordinated rotation and linear displacement of the tool, in a screwing fashion.
  • the rate of rotation of the tool 24 is one revolution per linear displacement equal to the pitch of the helical blade of the tool.
  • the level of cementitious grout 20 above the tapping tool 24 will drop in both the thread 58 in the ground as well as in the hollow drive shaft 46 as the tapping tool 24 is screwed downwards and thus causes the total volume of the pile cavity to increase due to the formation of the surrounding thread 58 in the ground. Additional cementitious grout may be fed via the shafts 46 and 26 or directly into the thread 58 at the ground surface, to completely fill the pile cavity with such grout.
  • the dimensions of a tapping tool used to form a thread around a shaft in the ground may be such that the tool causes the cross-sectional area of the shaft to increase during forming of the thread.
  • the thread may instead be formed around an empty shaft which is subsequently filled with cementitious grout, liquid concrete, or other pile forming material.
  • a shaft may be temporarily filled with a suitable liquid, such as bentonite clay slurry (comprised of such clay particles suspended in water), to provide internal support by virtue of its hydraulic pressure. At a suitable stage in the method, such slurry would be displaced from the pile cavity.
  • bentonite clay slurry may be progressively fed into the portion of the shaft below the continuous flight auger during its extraction from the shaft, in a similar fashion to the partial filling of a shaft with cementitious grout as shown in Figure 2.
  • a screw thread may then be formed around the central shaft filled with bentonite clay slurry.
  • cementitious grout or liquid concrete may be fed into the pile cavity via a delivery tube that discharges at the bottom of the cavity, to displace the bentonite clay slurry upwards and thus fill the entire cavity with cementitious grout or liquid concrete.
  • a piling device is designated generally by the reference numeral 60. It comprises a continuous flight auger 62 and a tapping tool 64.
  • the tapping tool 64 is identical to the tapping tool 24 of Figure 8. Identical or similar features, where designated, are thus designated again by the same reference numerals as before and a description of these features may be found in the description above of Figure 8.
  • the tapping tool 64 permits displacement of a liquid pile forming material therethrough via a passage 30 extending between two apertures 36 and 38.
  • the continuous flight auger 62 and the tapping tool 64 define attachment formations, in the form of formations 66 and 42, respectively, permitting the tapping tool 64 to be releasibly attached to the operative bottom end of the continuous flight auger 62 in a collinear configuration via an adapter 70.
  • a formation 72 prevents rotation of the continuous flight auger 62 with respect to the adapter 70 and a device 48 similarly prevents rotation of the tapping tool 64 with respect to the adapter 70.
  • the initial step of forming a shaft in the ground may be performed using the continuous flight auger 62 without the tapping tool 64 attached thereto.
  • the tapping tool 64 may be attached thereto for performing the step of forming the thread in the ground around the shaft.
  • a shaft 80 has been formed in the ground 82 using any suitable method.
  • the diameter of the shaft 80 say 25mm, is much smaller than the diameter of a shaft of a screwpile to be constructed in the ground 82.
  • a tapping tool 84 attached to a shaft 86 has been positioned over the shaft 80 in co-axial alignment therewith by means of a small rig (not shown).
  • the tool 84 has been screwed, by means of the rig, into the shaft 80 up to a predetermined depth, say 800mm, to form a helical thread 88 in the ground around the shaft.
  • Rotation of the tool 84 has been halted.
  • the resistance of the ground 90 engaged by the tapping tool 84 to axial displacement of the tool is now determined by measuring the axial force required to shear through the ground.
  • the strength of the ground 82 so determined at various depths may be applied to the design of screwpiles to be constructed therein.

Landscapes

  • 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)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

Selon ce procédé de construction d'un pieu, on forme un puits dans le sol, puis on forme un filetage hélicoïdal dans le sol, autour du puits, au moyen d'un outil de taraudage du sol. Un renforcement est placé de manière appropriée dans le puits et un matériau liquide de formation du pieu, tel que du béton ou un coulis de ciment, est introduit dans le puits pour remplir la cavité du pieu, y compris le puits et le filetage hélicoïdal. On permet ensuite au matériau de formation du pieu de durcir afin de former le pieu.
EP04732669A 2003-05-15 2004-05-13 Procede de construction de pieux Withdrawn EP1625258A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA200303782 2003-05-15
PCT/IB2004/001541 WO2004101897A1 (fr) 2003-05-15 2004-05-13 Procede de construction de pieux

Publications (1)

Publication Number Publication Date
EP1625258A1 true EP1625258A1 (fr) 2006-02-15

Family

ID=33453099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04732669A Withdrawn EP1625258A1 (fr) 2003-05-15 2004-05-13 Procede de construction de pieux

Country Status (3)

Country Link
EP (1) EP1625258A1 (fr)
WO (1) WO2004101897A1 (fr)
ZA (1) ZA200510247B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD4011C2 (ro) * 2009-08-26 2010-08-31 Григоре ЧАПА Procedeu de înălţare a pilonului armat monolit şi dispozitiv de montare auxiliar pentru realizarea lui
CN104947652B (zh) * 2015-07-02 2017-01-25 浙江新曙光建设有限公司 长螺旋钻孔水泥浆护壁式植入管桩的施工装置及施工方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9620251D0 (en) * 1996-09-26 1996-11-13 Cementation Piling & Found Bearing capacity enhancement for piling applications
GB0001323D0 (en) * 2000-01-20 2000-03-08 Sol Comp Du Rotary displacement piling equipment
GB2377235A (en) * 2001-07-17 2003-01-08 Cie Du Sol Drilling tool

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004101897A1 *

Also Published As

Publication number Publication date
WO2004101897A1 (fr) 2004-11-25
ZA200510247B (en) 2006-11-29

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