GB2455303A - Method and apparatus for forming a cast in situ screw pile - Google Patents
Method and apparatus for forming a cast in situ screw pile Download PDFInfo
- Publication number
- GB2455303A GB2455303A GB0723682A GB0723682A GB2455303A GB 2455303 A GB2455303 A GB 2455303A GB 0723682 A GB0723682 A GB 0723682A GB 0723682 A GB0723682 A GB 0723682A GB 2455303 A GB2455303 A GB 2455303A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tool
- ground
- forming
- pile
- screw 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000011065 in-situ storage Methods 0.000 title description 3
- 239000000463 material Substances 0.000 claims abstract description 48
- 239000011800 void material Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000010079 rubber tapping Methods 0.000 claims description 34
- 230000008878 coupling Effects 0.000 claims description 28
- 238000010168 coupling process Methods 0.000 claims description 28
- 238000005859 coupling reaction Methods 0.000 claims description 28
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
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
- E02D5/56—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
-
- 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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)
Abstract
An apparatus 10 and method for forming a screw pile comprises the steps of driving a tool 14,16,18 into the ground using a vibrating drive means 12, possibly comprising a sonic oscillator; rotating and retracting the tool 14,16,18 from the ground simultaneously, causing a blade 20 mounted on the tool to form a helical void in the ground; filling the helical void and the void left by the retracting tool with a liquid pile forming material, such as cement, supplied through the tool 32, 15, 28: and allowing the pile forming material to set.
Description
Method and apparatus for forming a screw pile The present invention relates to a method and apparatus for forming a screw pile in the ground and particularly to a method and apparatus for forming a screw pile using a liquid material which hardens in the ground, for example, a cementitious material.
Cast in situ screw piles are widely used and are created by penetrating the ground using a rotating auger head. A displacement auger head does not remove spoil as it is driven into the ground and consequently requires very large machinery. Also, a displacement pile auger tends to fail when a hard layer of ground is reached, such as a band of medium dense to dense sand or gravel, and hence their use is limited.
In these cases, the piling system of choice is a continuous flight auger (CFA), which removes spoil as it is augered into the ground. This has the disadvantages of producing large volumes of waste, being extremely noisy to operate and requiring a much larger and more costly piling platform and rig.
It is an object of the invention to provide a method and apparatus for forming a screw pile which reduces or substantially obviates the above mentioned problems. * .
According to a first aspect of the present invention there is provided a method for forming a screw pile comprising the steps of driving a tool into the ground using a vibrating drive means; rotating and retracting the tool from the ground simultaneously causing a blade mounted on the tool to form a helical void in the ground; filling the helical void and a void left by the retracting tool with a liquid pile forming material supplied through the tool; and allowing the pile forming material to set.
The vibrating drive means is intended to include any driver system utilising a vibrational output. This may include, for example, a resonant pile driver, which is also known as a sonic pile driver. In one arrangement, as disclosed in GB 2144468 A (BODINE), a vibrational output of a sonic oscillator effects resonant standing wave vibration of a compliant member, which is coupled to a pile. Sonic energy is concentrated along the axis of the pile.
S
Advantages of using a vibrating drive means to drive the tool into the ground without rotation are that due to the effectiveness of the drive means, smaller equipment including cheaper temporary piling platforms to support the piling rig can be utilised to install piles, which would previously have required much larger equipment.
The vibrating drive method is also much quieter than using a rotational auger drive and does not produce spoil. Furthermore, a pile can be produced with a smaller central core, thus requiring less filling material than that required for a core produced using a continuous flight auger.
Ground vibration to the surrounding area is also reduced, which can be important in particularly unstable environments.
Preferably the vibrating drive means includes a sonic oscillator.
Preferably the tool includes a pointed tapping tool for penetrating the ground. * . * ***
*. : Preferably the tool includes a drill tube attached to the tapping tool and a swivel * coupling. * .
: **** Preferably a passage is provided through the swivel coupling, the drill tube and the **** tapping tool for supplying the liquid pile forming material.
Preferably an outlet is provided in the tapping tool from the passage, substantially below the blade.
Preferably the liquid pile forming material is a cementitious based material.
According to a second aspect of the present invention there is provided an apparatus for forming a screw pile comprising a ground piercing tool, a vibrating drive means for driving the ground piercing tool into the ground, a blade mounted radially of the ground piercing tool, a passage for fluid material through the ground piercing tool and means for rotating the ground piercing tool whilst retracting it from the ground.
Preferably the vibrating drive means includes a sonic oscillator.
Preferably the tool includes a pointed tapping tool for penetrating the ground.
Preferably the tool includes a drill tube attached to the tapping tool and a swivel coupling.
Preferably a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile forming material.
Preferably an outlet is provided in the tapping tool from the passage, substantially below the blade.
For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: * *** * . S...
*:*. Figure 1 shows a schematic cross-sectional view through a screw piling apparatus.
Referring to Figure 1, an apparatus for forming a cementitous screw pile is indicated * .. generally at 10. The apparatus 10 includes a resonant pile driver 12, a drill tube 14 *5SS and a swivel coupling 16. The resonant pile driver 12 is connected to the drill tube 14 by means of the swivel coupling 16. A tapping tool 18 for penetrating the ground, also known as a tap bit 18, is provided at the end of the drill tube 14. A blade 20 is mounted to the side of the tap bit 18, which extends radially from the periphery of the tap bit 18. The blade 20 does not have a conventional helical form, but has a substantially sharp lower leading edge, which is capable of being thrust vertically downwards into the ground. The lateral width of the blade 20 is therefore as small as possible, but must have sufficient strength to be able to cut a thread as described below.
The drill tube 14 has a hollow interior 15 and is provided in sections, which can be connected together to form a drill tube of any desired length. The tap bit 18 has a substantially conical end 22, terminating in a downward facing point 24, which is driven into the ground. An internal cavity 26 is provided in the tap bit 18, which is in communication with the hollow interior 15 of the lowermost drill tube section 14. An aperture or outlet 28 is provided in the periphery of the tap bit 18, which is in communication with the internal cavity 26. The outlet 28 is positioned below the blade 20, and can be in axial alignment with the blade 20.
The swivel coupling 16 has an internal cavity 30, which is in communication with the hollow interior 15 of the uppermost drill tube section 14. An aperture or inlet 32 in the periphery of the coupling 16 is also in communication with the internal cavity 30.
The inlet 32 is connected to a concrete pump or the like, for pumping cementitous material into the apparatus 10. The cementitious material can be concrete or a cement based grout.
In use, the swivel coupling 16, drill tube 14 and tap bit 18 are initially assembled together. This assembly is known as a "key". The key is then connected to a piling rig, which is positioned vertically above the desired pile location. The piling rig includes the resonant pile driver 12, also known as a sonic pile driver.
The key is then pushed into the ground using the "pull down" mechanism of the piling I..... . . . * * rig until further penetration into the ground cannot be achieved. The resonant pile *.. driver 12 is then activated and the key is driven further into the ground until the ***.
design depth for the screw piling is reached. In this position, cementitious material is pumped into the key through the inlet 32 of the swivel coupling 16, down the hollow interior 15 of the drill tube 14 and out of outlet 28 of the tap bit 18. The key is then slowly rotated, whilst being simultaneously drawn upwards Out of the ground. The rotation of the key is controlled relative to the speed of axial withdrawal of the key from the ground, such that the blade 20 cuts a helical thread in the ground.
The thread is formed as a void in the ground behind the blade and as the key rotates the void is filled with cementitious material, which also fills the void left by the withdrawing tap bit 18 and drill tube 14. Eventually, the key is pulled out of the ground completely, leaving behind a cast cementitious screw pile. In most cases, reinforcement is then inserted into the cementitious screw pile, as required. The cementitious material is then allowed to harden. The method has the advantage that the thread void is filled with cementitious material almost immediately it is formed, thus obviating the need for any temporary filler material to prevent the void from collapsing.
The piling rig is of conventional construction, but can be much smaller than a rig typically used for screw piling of a similar size, for example, using an auger displacement pile. This is because sonic drive piling requires much less force to drive a pile into the ground than piling with a screw auger. Also, if no spoil is removed, then the difficulty of driving a screw auger into the ground increases significantly. S. * . * ..* *5* * S S... ** * * *. * S.
S..... * . S ** S* S **.
Method and apparatus for forming a screw pile The present invention relates to a method and apparatus for forming a screw pile in the ground and particularly to a method and apparatus for forming a screw pile using a liquid material which hardens in the ground, for example, a cementitious material.
Cast in situ screw piles are widely used and are created by penetrating the ground using a rotating auger head. A displacement auger head does not remove spoil as it is driven into the ground and consequently requires very large machinery. Also, a displacement pile auger tends to fail when a hard layer of ground is reached, such as a band of medium dense to dense sand or gravel, and hence their use is limited.
In these cases, the piling system of choice is a continuous flight auger (CFA), which removes spoil as it is augered into the ground. This has the disadvantages of producing large volumes of waste, being extremely noisy to operate and requiring a much larger and more costly piling platform and rig.
It is an object of the invention to provide a method and apparatus for forming a screw pile which reduces or substantially obviates the above mentioned problems. * .
According to a first aspect of the present invention there is provided a method for forming a screw pile comprising the steps of driving a tool into the ground using a vibrating drive means; rotating and retracting the tool from the ground simultaneously causing a blade mounted on the tool to form a helical void in the ground; filling the helical void and a void left by the retracting tool with a liquid pile forming material supplied through the tool; and allowing the pile forming material to set.
The vibrating drive means is intended to include any driver system utilising a vibrational output. This may include, for example, a resonant pile driver, which is also known as a sonic pile driver. In one arrangement, as disclosed in GB 2144468 A (BODINE), a vibrational output of a sonic oscillator effects resonant standing wave vibration of a compliant member, which is coupled to a pile. Sonic energy is concentrated along the axis of the pile.
S
Advantages of using a vibrating drive means to drive the tool into the ground without rotation are that due to the effectiveness of the drive means, smaller equipment including cheaper temporary piling platforms to support the piling rig can be utilised to install piles, which would previously have required much larger equipment.
The vibrating drive method is also much quieter than using a rotational auger drive and does not produce spoil. Furthermore, a pile can be produced with a smaller central core, thus requiring less filling material than that required for a core produced using a continuous flight auger.
Ground vibration to the surrounding area is also reduced, which can be important in particularly unstable environments.
Preferably the vibrating drive means includes a sonic oscillator.
Preferably the tool includes a pointed tapping tool for penetrating the ground. * . * ***
*. : Preferably the tool includes a drill tube attached to the tapping tool and a swivel * coupling. * .
: **** Preferably a passage is provided through the swivel coupling, the drill tube and the **** tapping tool for supplying the liquid pile forming material.
Preferably an outlet is provided in the tapping tool from the passage, substantially below the blade.
Preferably the liquid pile forming material is a cementitious based material.
According to a second aspect of the present invention there is provided an apparatus for forming a screw pile comprising a ground piercing tool, a vibrating drive means for driving the ground piercing tool into the ground, a blade mounted radially of the ground piercing tool, a passage for fluid material through the ground piercing tool and means for rotating the ground piercing tool whilst retracting it from the ground.
Preferably the vibrating drive means includes a sonic oscillator.
Preferably the tool includes a pointed tapping tool for penetrating the ground.
Preferably the tool includes a drill tube attached to the tapping tool and a swivel coupling.
Preferably a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile forming material.
Preferably an outlet is provided in the tapping tool from the passage, substantially below the blade.
For a better understanding of the present invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: * *** * . S...
*:*. Figure 1 shows a schematic cross-sectional view through a screw piling apparatus.
Referring to Figure 1, an apparatus for forming a cementitous screw pile is indicated * .. generally at 10. The apparatus 10 includes a resonant pile driver 12, a drill tube 14 *5SS and a swivel coupling 16. The resonant pile driver 12 is connected to the drill tube 14 by means of the swivel coupling 16. A tapping tool 18 for penetrating the ground, also known as a tap bit 18, is provided at the end of the drill tube 14. A blade 20 is mounted to the side of the tap bit 18, which extends radially from the periphery of the tap bit 18. The blade 20 does not have a conventional helical form, but has a substantially sharp lower leading edge, which is capable of being thrust vertically downwards into the ground. The lateral width of the blade 20 is therefore as small as possible, but must have sufficient strength to be able to cut a thread as described below.
The drill tube 14 has a hollow interior 15 and is provided in sections, which can be connected together to form a drill tube of any desired length. The tap bit 18 has a substantially conical end 22, terminating in a downward facing point 24, which is driven into the ground. An internal cavity 26 is provided in the tap bit 18, which is in communication with the hollow interior 15 of the lowermost drill tube section 14. An aperture or outlet 28 is provided in the periphery of the tap bit 18, which is in communication with the internal cavity 26. The outlet 28 is positioned below the blade 20, and can be in axial alignment with the blade 20.
The swivel coupling 16 has an internal cavity 30, which is in communication with the hollow interior 15 of the uppermost drill tube section 14. An aperture or inlet 32 in the periphery of the coupling 16 is also in communication with the internal cavity 30.
The inlet 32 is connected to a concrete pump or the like, for pumping cementitous material into the apparatus 10. The cementitious material can be concrete or a cement based grout.
In use, the swivel coupling 16, drill tube 14 and tap bit 18 are initially assembled together. This assembly is known as a "key". The key is then connected to a piling rig, which is positioned vertically above the desired pile location. The piling rig includes the resonant pile driver 12, also known as a sonic pile driver.
The key is then pushed into the ground using the "pull down" mechanism of the piling I..... . . . * * rig until further penetration into the ground cannot be achieved. The resonant pile *.. driver 12 is then activated and the key is driven further into the ground until the ***.
design depth for the screw piling is reached. In this position, cementitious material is pumped into the key through the inlet 32 of the swivel coupling 16, down the hollow interior 15 of the drill tube 14 and out of outlet 28 of the tap bit 18. The key is then slowly rotated, whilst being simultaneously drawn upwards Out of the ground. The rotation of the key is controlled relative to the speed of axial withdrawal of the key from the ground, such that the blade 20 cuts a helical thread in the ground.
The thread is formed as a void in the ground behind the blade and as the key rotates the void is filled with cementitious material, which also fills the void left by the withdrawing tap bit 18 and drill tube 14. Eventually, the key is pulled out of the ground completely, leaving behind a cast cementitious screw pile. In most cases, reinforcement is then inserted into the cementitious screw pile, as required. The cementitious material is then allowed to harden. The method has the advantage that the thread void is filled with cementitious material almost immediately it is formed, thus obviating the need for any temporary filler material to prevent the void from collapsing.
The piling rig is of conventional construction, but can be much smaller than a rig typically used for screw piling of a similar size, for example, using an auger displacement pile. This is because sonic drive piling requires much less force to drive a pile into the ground than piling with a screw auger. Also, if no spoil is removed, then the difficulty of driving a screw auger into the ground increases significantly. S. * . * ..* *5* * S S... ** * * *. * S.
S..... * . S ** S* S **.
Claims (16)
1. A method for forming a screw pile comprising the steps of driving a tool into the ground using a vibrating drive means; rotating and retracting the tool from the ground simultaneously causing a blade mounted on the tool to form a helical void in the ground; filling the helical void and a void left by the retracting tool with a liquid pile forming material supplied through the tool; and allowing the pile forming material to set.
2. A method for forming a screw pile as claimed in claim 1, in which the vibrating drive means includes a sonic oscillator. * S * S..
3. A method for forming a screw pile as claimed in claim 1 or claim 2, in which the tool includes a pointed tapping tool for penetrating the ground.
p..... * S
s
4. A method for forming a screw pile as claimed in claim 3, in which the tool S.'.
includes a drill tube attached to the tapping tool and a swivel coupling.
5. A method for forming a screw pile as claimed in claim 4, in which a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile forming material.
6. A method for forming a screw pile as claimed in claim 5, in which an outlet is provided in the tapping tool from the passage, substantially below the blade.
7. A method for forming a screw pile as claimed in any preceding claim, in which the liquid pile forming material is a cementitious based material.
8. An apparatus for forming a screw pile using the method as claimed in any one of claims 1 to 7.
9. An apparatus for forming a screw pile comprising a ground piercing tool, a vibrating drive means for driving the ground piercing tool into the ground, a blade mounted radially of the ground piercing tool, a passage for fluid material through the ground piercing tool and means for rotating the ground piercing tool whilst retracting it from the ground.
10. An apparatus as claimed in claim 9, in which the vibrating drive means includes a sonic oscillator.
11. An apparatus as claimed in claim 9 or claim 10, in which the tool includes a pointed tapping tool for penetrating the ground.
12. An apparatus as claimed in claim 11, in which the tool includes a drill tube "... attached to the tapping tool and a swivel coupling.
13. An apparatus as claimed in claim 12, in which a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile i., forming material. * **e
14. An apparatus as claimed in claim 12, in which an outlet is provided in the tapping tool from the passage, substantially below the blade.
15. A method for forming a screw pile substantially as claimed herein with reference to and as illustrated in Figure 1 of the accompanying drawings.
16. An apparatus for fonning a screw pile substantially as claimed herein with reference to and as illustrated in Figure 1 of the accompanying drawings.
16. An apparatus for fonning a screw pile substantially as claimed herein with reference to and as illustrated in Figure 1 of the accompanying drawings.
1. A method for forming a screw pile comprising the steps of driving a tool into the ground using a vibrating drive means; rotating and retracting the tool from the ground simultaneously causing a blade mounted on the tool to form a helical void in the ground; filling the helical void and a void left by the retracting tool with a liquid pile forming material supplied through the tool; and allowing the pile forming material to set.
2. A method for forming a screw pile as claimed in claim 1, in which the vibrating drive means includes a sonic oscillator. * S * S..
3. A method for forming a screw pile as claimed in claim 1 or claim 2, in which the tool includes a pointed tapping tool for penetrating the ground.
p..... * S
s 4. A method for forming a screw pile as claimed in claim 3, in which the tool S.'.
includes a drill tube attached to the tapping tool and a swivel coupling.
5. A method for forming a screw pile as claimed in claim 4, in which a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile forming material.
6. A method for forming a screw pile as claimed in claim 5, in which an outlet is provided in the tapping tool from the passage, substantially below the blade.
7. A method for forming a screw pile as claimed in any preceding claim, in which the liquid pile forming material is a cementitious based material.
8. An apparatus for forming a screw pile using the method as claimed in any one of claims 1 to 7.
9. An apparatus for forming a screw pile comprising a ground piercing tool, a vibrating drive means for driving the ground piercing tool into the ground, a blade mounted radially of the ground piercing tool, a passage for fluid material through the ground piercing tool and means for rotating the ground piercing tool whilst retracting it from the ground.
10. An apparatus as claimed in claim 9, in which the vibrating drive means includes a sonic oscillator.
11. An apparatus as claimed in claim 9 or claim 10, in which the tool includes a pointed tapping tool for penetrating the ground.
12. An apparatus as claimed in claim 11, in which the tool includes a drill tube "... attached to the tapping tool and a swivel coupling.
13. An apparatus as claimed in claim 12, in which a passage is provided through the swivel coupling, the drill tube and the tapping tool for supplying the liquid pile i., forming material. * **e
14. An apparatus as claimed in claim 12, in which an outlet is provided in the tapping tool from the passage, substantially below the blade.
15. A method for forming a screw pile substantially as claimed herein with reference to and as illustrated in Figure 1 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0723682A GB2455303A (en) | 2007-12-04 | 2007-12-04 | Method and apparatus for forming a cast in situ screw pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0723682A GB2455303A (en) | 2007-12-04 | 2007-12-04 | Method and apparatus for forming a cast in situ screw pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0723682D0 GB0723682D0 (en) | 2008-01-16 |
| GB2455303A true GB2455303A (en) | 2009-06-10 |
Family
ID=38982935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0723682A Withdrawn GB2455303A (en) | 2007-12-04 | 2007-12-04 | Method and apparatus for forming a cast in situ screw pile |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2455303A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556625A (en) * | 2013-10-27 | 2014-02-05 | 海南卓典高科技开发有限公司 | Complex squeezed pile forming construction method and complex squeezed pile forming device |
| GB2538769A (en) * | 2015-05-28 | 2016-11-30 | Abbey Pynford Holdings Ltd | Screw pile |
-
2007
- 2007-12-04 GB GB0723682A patent/GB2455303A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103556625A (en) * | 2013-10-27 | 2014-02-05 | 海南卓典高科技开发有限公司 | Complex squeezed pile forming construction method and complex squeezed pile forming device |
| WO2015058555A1 (en) * | 2013-10-27 | 2015-04-30 | 海南卓典高科技开发有限公司 | Pile-forming method for compound extruded and expanded pile and pile-forming equipment for compound extruded and expanded pile |
| CN103556625B (en) * | 2013-10-27 | 2015-06-03 | 彭桂皎 | Complex squeezed pile forming construction method and complex squeezed pile forming device |
| US9816244B2 (en) | 2013-10-27 | 2017-11-14 | Guijiao Peng | Pile-forming method for compound extruded and expanded pile and pile-forming equipment for compound extruded and expanded pile |
| GB2538769A (en) * | 2015-05-28 | 2016-11-30 | Abbey Pynford Holdings Ltd | Screw pile |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0723682D0 (en) | 2008-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |