EP1471187B1 - Threading equipment - Google Patents
Threading equipment Download PDFInfo
- Publication number
- EP1471187B1 EP1471187B1 EP04291004A EP04291004A EP1471187B1 EP 1471187 B1 EP1471187 B1 EP 1471187B1 EP 04291004 A EP04291004 A EP 04291004A EP 04291004 A EP04291004 A EP 04291004A EP 1471187 B1 EP1471187 B1 EP 1471187B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- shaft
- cutting means
- assembly
- drag
- 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.)
- Expired - Lifetime
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 81
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 16
- 239000002689 soil Substances 0.000 description 8
- 239000004927 clay Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
Images
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
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
Definitions
- the present invention relates to a threading equipment for cutting an internal thread inside a previously bored pile shaft, said shaft being preferably, but not necessarily, bored in clay or similar soil.
- the equipment may further comprise a bucket.
- the bearing capacity of the concrete pile greatly depends on the diameter of the pile.
- a technique to increase the bearing capacity of a pile of a given diameter is to make a thread or an helical slot in the internal wall of the pile shaft.
- the thread or helical slot is also filled with concrete.
- EP 1 277 887 in the name of Compagnie du Sol describes a drilling tool which is provided with a cutter. This cutter projects outside the lower end of the flight of this tool. When the tool is rotated and lifted the cutter makes a helical slot or thread in the inner wall of the pile shaft bored by the drilling tool itself.
- this technique is only usable when the tool is of the horizontal displacement type.
- GB-A-2 183 703 considered to represent the relevant state of the art, disclose a threading equipment for cutting a thread in the inner face of a shaft.
- An object of the present invention is to provide an equipment which permits the cutting of an internal thread inside a previously bored pile shaft, especially when the pile shaft is bored in clay or similar soil.
- the threading bucket equipment for cutting a thread in the inner wall of a shaft comprises:
- the cutting means is in its retracted position.
- the cutting means is moved to its expanded position. Then the displaceable assembly is raised and rotated whereby the cutting means makes the thread or helical slot in the internal wall of the pile shaft.
- the displaceable assembly further comprises a lower section secured to the upper section, said lower section forming a cylindrical container for receiving the soil cuttings.
- the displaceable assembly is fixed at the lower end of the driving rods.
- the cutting means When the driving rods are rotated in a first direction the cutting means is in its retracted position and when the driving rods are rotated in the second direction the cutting means is in its expanded active position.
- the pitch of the thread and the length of the thread can be predetermined by controlling the rotation speed and vertical displacement speed of the displaceable assembly.
- the displaceable assembly is provided with means, for example drag plates, to create a friction force between the displaceable assembly and the inner wall of the pile shaft whereby the sense of rotation of the driving rods can efficiently move the cutting member from its retracted position to its expanded position.
- the equipment comprises a piling rig 10 provided with a vertical mast 12.
- the upper end 12a of the mast is equipped with two pulleys 14, 16 for a cable 18.
- the mast 12 also forms a vertical guide for a movable rotary drive box 20.
- the rotary drive box 20 can be moved along the whole length of the mast 12.
- the equipment further comprises a set of driving rods or Kelly bar 22.
- the Kelly bar consists of a plurality of steel tubes which are locked one to the other.
- the upper end 22a of the Kelly bar is secured to an end of the cable 18. As a result, the up and down vertical movement of the Kelly bar is controlled by the cable.
- the Kelly bar 22 passes through the rotary drive box 20 and the box 20 applies a rotative torque to the Kelly bar 22. However, the Kelly bar can be vertically moved with respect to the box 20.
- the lower end 22b of the Kelly bar or of the driving rods is connected to a threading equipment 30 or displaceable assembly.
- the threading equipment 30 preferably comprises an upper section 32 and a lower section 34 which are interconnected.
- the upper section 32 will be described in greater detail hereinafter.
- the lower section 34 is in the form of a cylindrical container 36 for catching the clay or soil cuttings as they fall from the upper section 32 which consists of a cutting device 38 adapted to cut a thread or helical slot in the internal wall 37 of a previously bored pile shaft 39.
- the equipment further comprises speed transducers (not shown) to measure the vertical displacement speed and the rotational speed of the driving rods 22.
- the lower section 34 consists of a cylindrical container 36 having a cylindrical lateral wall 40, a bottom, 42 and an opened upper end 44.
- the bottom 42 is secured to a rotating control axis 46, the upper end of which is connected by a linking member 48 to the lower end of the driving rods.
- the upper section 32 consists of a threading equipment.
- the threading equipment comprises two cutting tools 52 and 54 diametrically opposed about the vertical control axis 46.
- Each cutting tool is linked to the axis 46 by a control mechanism 56 and 58.
- the control mechanisms are designed so that each cutting tool 52 or 54 can be moved, in a plane substantially perpendicular to the axis 46, between a retracted position shown in figure 3 and an expanded position shown in figure 2. More precisely, when the axis is rotated in the direction of arrow F1, the cutting tools are moved into their expanded position and when the axis 46 is rotated in the direction of arrow F2, the cutting tools are moved into their retracted position.
- the driving rods are rotated in the direction F2 so that the cutting member 50 is maintained in its retracted position.
- the rods 22 are rotated in the direction F1 so that the cutting tools 52 and 54 are moved and maintained in their expanded position.
- the assembly is lifted with controlled vertical and rotational speeds so that the tool 50 cuts in the wall 37 of the bore 39 a thread having the shape of an helical slot.
- the thread has a pitch which is defined by the vertical and rotational speeds. This pitch can be varied along the length of the bored shaft. The thread can extend only along a lower portion of the shaft.
- the assembly 30 is rotated in the direction F2 when the thread is terminated.
- the soil cuttings fall into the cylindrical container 36.
- the thread can be formed in one or several sections depending on the capacity of the container 36. As previously explained, the threading equipment can have no lower section, i.e. no bucket.
- Fig. 6 shows a shaft 39, the wall 37 of which is provided with a thread or helical slot 58.
- the shape of the thread is defined by the shape of the cutting tool 50.
- the threading bucket can be equipped with two diametrically opposed cutting tools. Thus, a double helical slot is obtained.
- the threading equipment is provided with a bucket.
- This equipment is called a threading bucket.
- the threading bucket numbered 60 is provided with means to create a friction force between the threading equipment and the wall of the shaft. This friction force permits the actual movement of the cutting member with respect to the frame of the equipment in its expanded position and its retracted position.
- the cutting device 62 comprises two diametrically disposed cutting systems 64 and 66. These two cutting systems are identical, so only cutting system 64 will be described.
- the cutting system 64 comprises a vertical drive tube 68 which is attached to the lower end 22b of the Kelly bar 22.
- Drive brackets 70 are secured to the drive tube 68.
- Linking levers 72 have a first end 72a which is pivotally mounted on the end 70a of the drive brackets 70.
- the second end 72b of the linking levers 72 is pivotally mounted on the median portion 74a of a cutting frame 74.
- the cutting frame 74 In a horizontal plane, the cutting frame 74 has the shape of an arc of a circle.
- a first end 74b of the cutting frame 74 is pivotally mounted at the end 76a of upper drag bracket 76.
- the upper drag brackets 76 are secured to a drag tube 78 which is mounted around the outside of the drive tube 68.
- the drag tube 78 can rotate around the drive tube 68, thus allowing the drag brackets 76 to rotate relative to the drive brackets 70.
- Lower drag brackets 77 are also secured to the drag tube 78.
- the end 77a of the lower drag brackets 77 is equipped with a drag plate 80.
- the drag plate 80 has the general shape of a portion of cylinder and is mounted on the drag bracket 76 by means of a biasing spring 82.
- the second end 74C of the cutting frame 74 is provided with a tool holder 84 for receiving the cutting tool or cutting teeth 86.
- the cutting tool 86 projects outside the external face 74d of the cutting frame 74.
- the drag plate 80 is disposed below the cutting tool 86.
- the drag plate 80 is positioned so as to be in firm contact with the inner wall 37 of the shaft under the effect of the biasing spring 82 when the threading equipment is introduced into the upper end of the shaft.
- the threading bucket is rotated in a counter-clockwise direction to retract the cutting tools 86, thus allowing it to be removed from the shaft.
- the threading equipment is lifted 800 mm for each rotation, thereby forming a double helix with a pitch of 800 mm and a distance between two threads of 400 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Earth Drilling (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- External Artificial Organs (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Treatment Of Fiber Materials (AREA)
- Milling Processes (AREA)
Abstract
Description
- The present invention relates to a threading equipment for cutting an internal thread inside a previously bored pile shaft, said shaft being preferably, but not necessarily, bored in clay or similar soil. The equipment may further comprise a bucket.
- When making concrete piles in the soil it is advantageous to limit the diameter of the pile shaft to be bored. Indeed, when the diameter of the pile shaft is reduced, the cost of the drilling operation is lowered.
- However, the bearing capacity of the concrete pile greatly depends on the diameter of the pile. A technique to increase the bearing capacity of a pile of a given diameter is to make a thread or an helical slot in the internal wall of the pile shaft. When the pile shaft is filled with concrete to obtain the pile, the thread or helical slot is also filled with concrete.
- EP 1 277 887 in the name of Compagnie du Sol describes a drilling tool which is provided with a cutter. This cutter projects outside the lower end of the flight of this tool. When the tool is rotated and lifted the cutter makes a helical slot or thread in the inner wall of the pile shaft bored by the drilling tool itself. However, this technique is only usable when the tool is of the horizontal displacement type.
- GB-A-2 183 703, considered to represent the relevant state of the art, disclose a threading equipment for cutting a thread in the inner face of a shaft.
- An object of the present invention is to provide an equipment which permits the cutting of an internal thread inside a previously bored pile shaft, especially when the pile shaft is bored in clay or similar soil.
- To achieve this object, according to the present invention, the threading bucket equipment for cutting a thread in the inner wall of a shaft comprises:
- a displaceable assembly comprising an upper section including cutting means and control means to move said cutting means from a retracted position, wherein said cutting means is disposed within said shaft to an expanded position wherein said cutting means projects outside said shaft and cuts the wall of the shaft; and means for creating a friction force between said upper section and the inner surface of said shaft;
- means for controlling the vertical displacement speed of said displaceable assembly within said shaft; and
- means for controlling the rotation speed and the sense of rotation of said assembly about its vertical axis within said shaft, whereby said cutting means is adapted to cut at least one thread in the surface of said shaft having a controlled pitch along a controlled length of said shaft, when said cutting means is in its expanded position.
- It will be understood that, during the downward displacement of the displaceable assembly within the shaft, the cutting means is in its retracted position. When the assembly reaches the bottom of the shaft the cutting means is moved to its expanded position. Then the displaceable assembly is raised and rotated whereby the cutting means makes the thread or helical slot in the internal wall of the pile shaft.
- Preferably, the displaceable assembly further comprises a lower section secured to the upper section, said lower section forming a cylindrical container for receiving the soil cuttings.
- Advantageously, the displaceable assembly is fixed at the lower end of the driving rods. When the driving rods are rotated in a first direction the cutting means is in its retracted position and when the driving rods are rotated in the second direction the cutting means is in its expanded active position.
- The pitch of the thread and the length of the thread can be predetermined by controlling the rotation speed and vertical displacement speed of the displaceable assembly.
- Also, the displaceable assembly is provided with means, for example drag plates, to create a friction force between the displaceable assembly and the inner wall of the pile shaft whereby the sense of rotation of the driving rods can efficiently move the cutting member from its retracted position to its expanded position.
- Other features or advantages of the present invention will appear clearer on reading the following description of several preferred embodiments of the invention given by way of non-limiting example.
- The description refers to the accompanying figures in which :
- fig. 1 is a simplified view of the whole threading equipment;
- figs. 2 and 3 are simplified vertical sectional views of the threading equipment showing the cutting means in retracted and expanded position;
- figs. 4A and 4B are detailed horizontal views of the threading equipment showing the cutting means in expanded position and retracted position;
- fig. 5 is a vertical sectional view of the threading equipment;
- fig. 6 is an example of a pile obtained by using the threading equipment; and
- fig. 7 shows a cutting tool adapted to be used with the threading equipment.
- Referring firstly to fig. 1, the main parts of the threading equipment will be described.
- The equipment comprises a
piling rig 10 provided with avertical mast 12. Theupper end 12a of the mast is equipped with twopulleys cable 18. Themast 12 also forms a vertical guide for a movablerotary drive box 20. Therotary drive box 20 can be moved along the whole length of themast 12. The equipment further comprises a set of driving rods or Kellybar 22. The Kelly bar consists of a plurality of steel tubes which are locked one to the other. Theupper end 22a of the Kelly bar is secured to an end of thecable 18. As a result, the up and down vertical movement of the Kelly bar is controlled by the cable. - The Kelly
bar 22 passes through therotary drive box 20 and thebox 20 applies a rotative torque to the Kellybar 22. However, the Kelly bar can be vertically moved with respect to thebox 20. - The
lower end 22b of the Kelly bar or of the driving rods is connected to athreading equipment 30 or displaceable assembly. Thethreading equipment 30 preferably comprises anupper section 32 and alower section 34 which are interconnected. Theupper section 32 will be described in greater detail hereinafter. Thelower section 34 is in the form of acylindrical container 36 for catching the clay or soil cuttings as they fall from theupper section 32 which consists of acutting device 38 adapted to cut a thread or helical slot in theinternal wall 37 of a previouslybored pile shaft 39. - The equipment further comprises speed transducers (not shown) to measure the vertical displacement speed and the rotational speed of the
driving rods 22. - Referring now to figures 2 and 3, the principle of a
threading bucket 30 equipment is described hereunder. Thelower section 34 consists of acylindrical container 36 having a cylindrical lateral wall 40, a bottom, 42 and an openedupper end 44. - The
bottom 42 is secured to a rotatingcontrol axis 46, the upper end of which is connected by a linkingmember 48 to the lower end of the driving rods. - The
upper section 32 consists of a threading equipment. The threading equipment comprises twocutting tools vertical control axis 46. Each cutting tool is linked to theaxis 46 by acontrol mechanism cutting tool axis 46, between a retracted position shown in figure 3 and an expanded position shown in figure 2. More precisely, when the axis is rotated in the direction of arrow F1, the cutting tools are moved into their expanded position and when theaxis 46 is rotated in the direction of arrow F2, the cutting tools are moved into their retracted position. - The theoretical embodiment shown in figures 2 and 3 allows the operation of the threading bucket equipment to be understood.
- When the
displaceable assembly 30 is moved downwardly in thebored shaft 39 the driving rods are rotated in the direction F2 so that thecutting member 50 is maintained in its retracted position. When theassembly 30 reaches the bottom of theshaft 39 therods 22 are rotated in the direction F1 so that thecutting tools tool 50 cuts in thewall 37 of the bore 39 a thread having the shape of an helical slot. The thread has a pitch which is defined by the vertical and rotational speeds. This pitch can be varied along the length of the bored shaft. The thread can extend only along a lower portion of the shaft. Theassembly 30 is rotated in the direction F2 when the thread is terminated. - The soil cuttings fall into the
cylindrical container 36. The thread can be formed in one or several sections depending on the capacity of thecontainer 36. As previously explained, the threading equipment can have no lower section, i.e. no bucket. - Fig. 6 shows a
shaft 39, thewall 37 of which is provided with a thread orhelical slot 58. The shape of the thread is defined by the shape of thecutting tool 50. The threading bucket can be equipped with two diametrically opposed cutting tools. Thus, a double helical slot is obtained. - Referring now to figs. 4A, 4B and 5, a preferred embodiment wherein the threading equipment is provided with a bucket will be described in detail. This equipment is called a threading bucket. According to this preferred embodiment the threading bucket numbered 60 is provided with means to create a friction force between the threading equipment and the wall of the shaft. This friction force permits the actual movement of the cutting member with respect to the frame of the equipment in its expanded position and its retracted position.
- The cutting
device 62 comprises two diametricallydisposed cutting systems system 64 will be described. - The cutting
system 64 comprises avertical drive tube 68 which is attached to thelower end 22b of theKelly bar 22. Drivebrackets 70 are secured to thedrive tube 68. Linkinglevers 72 have afirst end 72a which is pivotally mounted on theend 70a of thedrive brackets 70. Thesecond end 72b of the linking levers 72 is pivotally mounted on themedian portion 74a of a cuttingframe 74. In a horizontal plane, the cuttingframe 74 has the shape of an arc of a circle. A first end 74b of the cuttingframe 74 is pivotally mounted at the end 76a ofupper drag bracket 76. Theupper drag brackets 76 are secured to adrag tube 78 which is mounted around the outside of thedrive tube 68. Thedrag tube 78 can rotate around thedrive tube 68, thus allowing thedrag brackets 76 to rotate relative to thedrive brackets 70. -
Lower drag brackets 77 are also secured to thedrag tube 78. The end 77a of thelower drag brackets 77 is equipped with adrag plate 80. Thedrag plate 80 has the general shape of a portion of cylinder and is mounted on thedrag bracket 76 by means of a biasingspring 82. - The second end 74C of the cutting
frame 74 is provided with atool holder 84 for receiving the cutting tool or cuttingteeth 86. The cuttingtool 86 projects outside the external face 74d of the cuttingframe 74. - As shown in figure 5, the
drag plate 80 is disposed below the cuttingtool 86. - The
drag plate 80 is positioned so as to be in firm contact with theinner wall 37 of the shaft under the effect of the biasingspring 82 when the threading equipment is introduced into the upper end of the shaft. - Due to the friction force created between the
drag plate 80 and the wall of the shaft, when thedrive tube 68 is rotated in a counter-clockwise direction (fig. 4B) thedrive bracket 70 is also rotated and the cuttingframe 74 is pivoted about the end 76b of thedrag bracket 76, towards the inner part of the threading bucket by means of the linkinglever 72. Consequently, the cuttingtool 86 is moved and maintained in its retracted position. - Also due to the friction force, when the
drive tube 68 is rotated in the clockwise direction (figure 4A), thedrive bracket 70 is also rotated. The rotation of thedrive bracket 70 produces the outwardly pivotal movement of the cuttingframe 74 about its ends 74b by means of the linkinglever 72. Consequently, the cuttingtool 86 is moved in its expanded position. Moreover, when thecutting tools 86 begin to bite into the soil, they themselves will provide additional resistance to rotation to keep them in their expanded position at their maximum diameter. - When the thread has been completed or the
cylindrical container 34 has been filled with soil cuttings, the threading bucket is rotated in a counter-clockwise direction to retract thecutting tools 86, thus allowing it to be removed from the shaft. - Typically, the threading equipment is lifted 800 mm for each rotation, thereby forming a double helix with a pitch of 800 mm and a distance between two threads of 400 mm.
Claims (10)
- A threading equipment (30), for cutting a thread in the inner face of a shaft (39) comprising :- a displaceable assembly comprising :an upper section (32) including cutting means (52,54) and control means (56,58) to move said cutting means from a retracted position, wherein said cutting means is disposed within said shaft, to an expanded position wherein said cutting means projects into the wall of the shaft, and means (80) for creating a friction force between said upper section and the inner surface (37) of said shaft;- means for controlling the vertical displacement speed of said displaceable assembly within said shaft; and- means for controlling the rotation speed and the sense of rotation of said assembly about its vertical axis within said shaft, whereby said cutting means (52,54) is adapted to cut at least one thread in the surface of said shaft having a controlled pitch along a controlled length of said shaft, when said cutting means is in its expanded position.
- The threading equipment of claim 1, wherein said displaceable assembly further comprises a lower section (34) connected to said upper section, said lower section forming a cylindrical container.
- The threading bucket equipment of claim 1 or 2, wherein said means for controlling the displacements of said displaceable assembly comprises :- a plurality of driving rods (22), said displaceable assembly being connected to the lower end of said rods;- means for rotating said rods at a controlled speed and in a clockwise direction or a counter-clockwise direction ; and- means for vertically moving said rods at a controlled speed.
- The threading equipment according to any one of claims 1 to 3, wherein said means for moving said cutting means comprises mechanical linking means (72) having a first end connected to said cutting means and a second end cinematically connected to the lower rods so that said cutting means be in its expanded rotation when said rods are rotated in a first direction and in its retracted position when said rods are rotated in the second direction.
- The threading equipment of any one of claims 1 to 4, wherein said cutting means is moved, between its retracted and expanded position, within a plane substantially perpendicular to the longitudinal axis of the displaceable assembly.
- The threading equipment of claim any one of claims 1 to 5, wherein said means for creating a friction force includes at least two moveable drag plates (80) biased by two biasing means.
- The threading equipment of claim 4, wherein said mechanical linking means comprises :- a drive tube (68) secured to said rods;- a drag tube (78) mounted around said drive tube;- a support member (74) for supporting said cutting means having a first end secured to said drive tube, said cutting means being secured to said support member at a place distinct from said first end;
a drive bracket (70) secured to said drive tube;- a lever member (72) having a first end pivotally mounted at the end of said bracket and a second end pivotally mounted on said support member at a place distinct from said first end. - The threading equipment of claim 7 further comprising two drag brackets (77) secured to said drag tube (78) and two drag plates (80), each drag plate being mounted at the end of a drag bracket (77) by means of biasing springs.
- The threading equipment of any one of claims 1 to 8, wherein said cutting means (52, 54) is a cutter the active end of which has in vertical section the shape of the profile of the thread to be cut in the surface of the shaft.
- The threading equipment according to any one of claims 1 to 9, wherein said cutting means (52, 54) comprise two cutting members diametrically opposed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL04291004T PL1471187T3 (en) | 2003-04-22 | 2004-04-15 | Threading equipment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0309090 | 2003-04-22 | ||
GB0309090A GB2400869B (en) | 2003-04-22 | 2003-04-22 | Threading equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1471187A1 EP1471187A1 (en) | 2004-10-27 |
EP1471187B1 true EP1471187B1 (en) | 2006-11-29 |
Family
ID=9957082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04291004A Expired - Lifetime EP1471187B1 (en) | 2003-04-22 | 2004-04-15 | Threading equipment |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1471187B1 (en) |
AT (1) | ATE346988T1 (en) |
DE (1) | DE602004003418T2 (en) |
ES (1) | ES2277218T3 (en) |
GB (1) | GB2400869B (en) |
PL (1) | PL1471187T3 (en) |
PT (1) | PT1471187E (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2889241B1 (en) * | 2005-07-28 | 2013-05-17 | Cie Du Sol | TARIERE A MOBILE ERGOT |
ATE480670T1 (en) * | 2005-07-28 | 2010-09-15 | Soletanche Freyssinet | DRILL AUGER |
FR2940661B1 (en) * | 2008-12-30 | 2011-01-21 | Cie Du Sol | EXCAVATION MACHINE HAVING A KELLY WITH CAVITIES DISCHARGING ON TWO SIDES |
IT1394002B1 (en) * | 2009-04-21 | 2012-05-17 | Soilmec Spa | EXCAVATION AND CONSTIPATION EQUIPMENT FOR BUILDING SCREW POLES. |
JP6427477B2 (en) * | 2015-09-24 | 2018-11-21 | 前田製管株式会社 | Expanded hole drilling head |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB240667A (en) * | 1924-11-06 | 1925-10-08 | William Langsdorf | Improvements in ground augers |
US1916691A (en) * | 1932-03-24 | 1933-07-04 | Raymond Concrete Pile Co | Reamer for earth boring buckets |
GB2183703A (en) * | 1985-08-22 | 1987-06-10 | Cementation Piling & Found | In situ concrete pile construction and under cutting tool |
JP2724548B2 (en) * | 1995-07-10 | 1998-03-09 | 関西電力株式会社 | 2-stage enlarged head |
GB9620251D0 (en) * | 1996-09-26 | 1996-11-13 | Cementation Piling & Found | Bearing capacity enhancement for piling applications |
JPH112085A (en) * | 1997-04-18 | 1999-01-06 | Nippon Concrete Ind Co Ltd | Excavating device |
JP2000337072A (en) * | 1999-06-01 | 2000-12-05 | Sanekata Naoya | Underground drilling device and method |
GB2377235A (en) * | 2001-07-17 | 2003-01-08 | Cie Du Sol | Drilling tool |
-
2003
- 2003-04-22 GB GB0309090A patent/GB2400869B/en not_active Expired - Fee Related
-
2004
- 2004-04-15 EP EP04291004A patent/EP1471187B1/en not_active Expired - Lifetime
- 2004-04-15 ES ES04291004T patent/ES2277218T3/en not_active Expired - Lifetime
- 2004-04-15 PL PL04291004T patent/PL1471187T3/en unknown
- 2004-04-15 DE DE602004003418T patent/DE602004003418T2/en not_active Expired - Lifetime
- 2004-04-15 PT PT04291004T patent/PT1471187E/en unknown
- 2004-04-15 AT AT04291004T patent/ATE346988T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PT1471187E (en) | 2007-02-28 |
EP1471187A1 (en) | 2004-10-27 |
GB2400869A (en) | 2004-10-27 |
DE602004003418T2 (en) | 2007-10-04 |
GB0309090D0 (en) | 2003-05-28 |
PL1471187T3 (en) | 2007-04-30 |
ES2277218T3 (en) | 2007-07-01 |
ATE346988T1 (en) | 2006-12-15 |
DE602004003418D1 (en) | 2007-01-11 |
GB2400869B (en) | 2006-11-15 |
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