EP4273327A1 - A method for providing a concrete pile and a concrete pile - Google Patents
A method for providing a concrete pile and a concrete pile Download PDFInfo
- Publication number
- EP4273327A1 EP4273327A1 EP23171385.0A EP23171385A EP4273327A1 EP 4273327 A1 EP4273327 A1 EP 4273327A1 EP 23171385 A EP23171385 A EP 23171385A EP 4273327 A1 EP4273327 A1 EP 4273327A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pile
- concrete
- section
- bottom section
- hollow
- 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.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 230000002787 reinforcement Effects 0.000 claims abstract description 20
- 210000002435 tendon Anatomy 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 238000009751 slip forming Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E02D5/24—Prefabricated 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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
-
- 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
- E02D7/02—Placing by driving
Definitions
- the present invention relates to a method for providing a reinforced hollow concrete pile for pile driving.
- Concrete piles are used as part of a foundation in order to be able to build a building on ground that is for example soft or wet.
- the foundation provides support for the building on the ground and transfers loads of the building to the ground.
- a method according to the preamble is characterized in that the method comprises the steps of: providing a concrete beam having a hollow core,
- a volume of the hollow core is for example 20 or 30% of a total volume of the pile, thus saving concrete, weight and costs.
- the concrete mixture comprises water, sand and cement in such proportions that the hollow concrete pile does not collapse.
- Removing a portion of concrete from a pile head section and/or the pile bottom section can be removing concrete from a side of the beam in the pile head section and/or bottom head section, thereby exposing the hollow core of the beam. It can also be removing all concrete from the pile head section and/or pile bottom section of the beam.
- the concrete pile having a hollow core is provided by a wet casting method, a slip forming method or an extrusion method.
- the concrete pile having a hollow core is provided by an extrusion method.
- GB 994578 describes such an extrusion method for providing reinforced hollow concrete sections.
- the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- the rebars or tendon wires provide the concrete pile with additional strength, so the piler may better withstand the impact of a hammer head during pile driving.
- the reinforcement can be placed such that the rebars or tendon wires are located within a circumference of the reinforcement, or such that the rebars or tendon wires are located outside the circumference of the reinforcement.
- the second concrete mixture is compacted after filling the pile head section and/or the pile bottom section with a second concrete mixture.
- Compacting the second concrete mixture results in a stronger piler head and/or bottom, so the piler may better withstand the impact of a hammer head during pile driving.
- Compacting may for example be performed by shaking or vibration.
- setting of the first concrete mixture and the second concrete mixture is facilitated by heating.
- Heating the first and second concrete mixtures assists in accelerating setting of the concrete mixtures, so the piler may be produced faster.
- the heating is for example provided by a heating conduit extending along the setting piler.
- the reinforcement comprises a metal helix.
- a helix is easily introduced in the hollow core or wrapped around tendion wires, and a pitch of the helix may be adapted to a desired number to provide the required reinforcement.
- the helix of the pile head section may for example comprise 3-12 windings having a pitch of 1-10 cm.
- the helix comprises 5-9 windings having a pitch of 4-5 cm.
- the reinforced hollow concrete beam is cut transversally at the level of the pile head section and/or pile bottom section.
- the reinforced concrete pile is cut transversely at the level of the pile head section and/or pile bottom section such that mutiple reinforced hollow concrete piles are obtained from one concrete beam.
- the present invention relates to a reinforced hollow concrete pile for pile driving, wherein the pile extends in a first direction and comprises
- the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- the rebars or tendon wires provide the concrete pile with additional strength, so the piler may better withstand the impact of a hammer head during pile driving.
- the reinforcement can be placed such that the rebars or tendon wires are located within a circumference of the reinforcement, or such that the rebars or tendon wires are located outside the circumference of the reinforcement.
- the reinforcement is in the form of a metal spiral.
- a spiral is easily introduced in the hollow core or wrapped around tendon wires, and a pitch of the spiral may be adapted to a desired number to provide the required reinforcement.
- the helix of the pile head section may for example comprise 3-12 windings having a pitch of 1-10 cm.
- the helix comprises 5-9 windings having a pitch of 4-5 cm.
- the pile head section extends over a length of 30-100 cm, preferably over a length of 40-70 cm, such as 60 cm.
- the pile bottom section extends over a length of 10-50 cm, preferably over a length of 20-40 cm, such as 30 cm.
- a diameter of the hollow core is 40-70% of a width of the reinforced hollow concrete pile, preferably 50-60%.
- Fig. 1A shows a cross sectional view of a multitude of tendon wires 100 that extend in a longitudinal direction.
- the tendon wires 100 are provided above a supporting surface 110, under which heating conduits 120 extend.
- the tendon wires 100 are arranged in sets of four tendon wires 100, such that of each set a first and a second tendon wire 100 are provided in a first plane substantially parallel to the supporting surface, and a third and a fourth tendon wire 100 are provided in a second plane substantially parallel to the supporting surface 110.
- the first and the third tendon wire 100 are provided in a third plane substantially perpendicular to the supporting surface 110, and the second and the fourth tendon wire 100 in a fourth plane substantially perpendicular to the supporting surface 110.
- Fig. 1B shows a cross section of the bottom part of a device 130 for providing a first concrete mixture 153.
- the device 130 is an concrete extruder 130 provided with wheels 131 which enable the extruder 130 to drive in the longitudinal direction over the support surface 110 while extruding concrete.
- the extruder 130 comprises four screws 132.
- the extruder 130 is aligned such that each screw 132 is positioned substantially centered with respect to the four tendon wires 100 of each set of tendon wires 100.
- the first concrete mixture 153 is extruded by means of four sets of dies and mandrels which are shaped to produce the required cross section as shown in Fig. 1C .
- the four tendon wires 100 of a set of tendon wires 100 are embedded in the first concrete mixture.
- the extruder is furthermore provided with guiding surfaces 140 which are aligned with the upright side walls of the dies, that guide the first concrete mixture being extruded and assist in shaping a concrete profiled hollow beam 150 having a hollow core 151 as shown in Fig. 1C .
- Fig. 1D shows a cross section of the concrete hollow beam 150 having a hollow core 151 at the level of a pile head and bottom section 152.
- a portion of concrete in the upper wall of the beam is removed from one or more pile head/bottom sections, such that the hollow core 151 of the concrete hollow beam 150 is exposed.
- One or more reinforcements 200 are then placed in the hollow core 151, and the hollow core 151 and the space of the removed wall part of the pile head/bottom section 152 is filled with a second concrete mixture 154, as shown in Figs. 2A and 2C .
- the concrete beam 150 is then heated by means of the heating conduits 120 and allowed to set to yield the reinforced hollow concrete beam 150.
- the beam 150 is then cut through at the locations of the reinforcement 200 in the pile head/bottom section(s), whereby multiple hollow reinforced piles are obtained having a reinforced head and a reinforced bottom.
- Fig. 2A shows a longitudinal cross section of an end part of the finished reinforced hollow concrete pile 250 for pile driving.
- Fig. 2B shows a cross section A-A of the reinforced hollow concrete pile 250 for pile driving at the level of a middle section between the pile head section 152 and a pile bottom section.
- Fig. 2C shows a cross section C-C of the reinforced hollow concrete pile 250 for pile driving at the level of the pile head.
- the pile head section 152 comprises the reinforcement 200 which extends in the longitudinal direction of the concrete pile 250 and which in this embodiment is in the form of a reinforcing metal helical wire 201 which is fixed in shape by means of wires 202 extending in the axial direction of the helix, and which are fixed to the helical wire 201.
- the hollow core 151 is filled with the second concrete mixture 154, resulting in the reinforcing metal helix 200 being embedded in the concrete mixture.
- the middle section comprises the hollow core 151 extending between the pile head section 152 and the pile bottom section 152.
Abstract
A method for providing a reinforced hollow concrete pile (250) for pile driving, the method comprises the steps of:
- providing a concrete beam (150) having a hollow core,
- removing a portion of concrete (151) from a pile head section and/or a pile bottom section of the concrete beam to expose the hollow core,
- placing a reinforcement (200) in the hollow core of the pile head section and/or the pile bottom section,
- filling the pile head section and/or the pile bottom section with a concrete mixture (154),
- allowing the concrete to set to yield the reinforced hollow concrete pile for pile driving.
- providing a concrete beam (150) having a hollow core,
- removing a portion of concrete (151) from a pile head section and/or a pile bottom section of the concrete beam to expose the hollow core,
- placing a reinforcement (200) in the hollow core of the pile head section and/or the pile bottom section,
- filling the pile head section and/or the pile bottom section with a concrete mixture (154),
- allowing the concrete to set to yield the reinforced hollow concrete pile for pile driving.
Description
- The present invention relates to a method for providing a reinforced hollow concrete pile for pile driving.
- Concrete piles are used as part of a foundation in order to be able to build a building on ground that is for example soft or wet. The foundation provides support for the building on the ground and transfers loads of the building to the ground.
- It is known to use piles comprising a hollow middle section as opposed to piles of solid concrete.
- However, a disadvantage of these sections is that they are not suitable for introduction into the ground by pile driving since they are not able to withstand an impact of a hammer head.
- It is an object of the present invention to provide a concrete pile that is suitable for pile driving and which is relatively cheap to produce and/or easy to handle.
- To this end, a method according to the preamble is characterized in that the method comprises the steps of:
providing a concrete beam having a hollow core, - removing a portion of concrete from a pile head section and/or a pile bottom section of the concrete beam,
- placing a reinforcement in the pile head section and/or the pile bottom section,
- filling the pile head section and/or the pile bottom section with a concrete mixture,
- allowing the concrete to set to yield the reinforced hollow concrete pile for pile driving.
- In this way a pile is provided which is cheaper to produce while being suitable for pile driving. A volume of the hollow core is for example 20 or 30% of a total volume of the pile, thus saving concrete, weight and costs.
- The concrete mixture comprises water, sand and cement in such proportions that the hollow concrete pile does not collapse.
- Removing a portion of concrete from a pile head section and/or the pile bottom section can be removing concrete from a side of the beam in the pile head section and/or bottom head section, thereby exposing the hollow core of the beam. It can also be removing all concrete from the pile head section and/or pile bottom section of the beam.
- According to an embodiment, the concrete pile having a hollow core is provided by a wet casting method, a slip forming method or an extrusion method.
- According to an embodiment, the concrete pile having a hollow core is provided by an extrusion method.
-
GB 994578 - According to an embodiment, the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- The rebars or tendon wires provide the concrete pile with additional strength, so the piler may better withstand the impact of a hammer head during pile driving. When rebars or tendon wires are present, the reinforcement can be placed such that the rebars or tendon wires are located within a circumference of the reinforcement, or such that the rebars or tendon wires are located outside the circumference of the reinforcement.
- According to an embodiment, the second concrete mixture is compacted after filling the pile head section and/or the pile bottom section with a second concrete mixture.
- Compacting the second concrete mixture results in a stronger piler head and/or bottom, so the piler may better withstand the impact of a hammer head during pile driving. Compacting may for example be performed by shaking or vibration.
- According to an embodiment, setting of the first concrete mixture and the second concrete mixture is facilitated by heating.
- Heating the first and second concrete mixtures assists in accelerating setting of the concrete mixtures, so the piler may be produced faster. The heating is for example provided by a heating conduit extending along the setting piler.
- According to an embodiment, the reinforcement comprises a metal helix.
- A helix is easily introduced in the hollow core or wrapped around tendion wires, and a pitch of the helix may be adapted to a desired number to provide the required reinforcement. The helix of the pile head section may for example comprise 3-12 windings having a pitch of 1-10 cm. Preferably, the helix comprises 5-9 windings having a pitch of 4-5 cm.
- According to an embodiment, after the step of allowing the first concrete mixture and the second concrete mixture to set, the reinforced hollow concrete beam is cut transversally at the level of the pile head section and/or pile bottom section.
- In this way multiple reinforced hollow concrete piles may be produced in a single run.
- According to an embodiment, the reinforced concrete pile is cut transversely at the level of the pile head section and/or pile bottom section such that mutiple reinforced hollow concrete piles are obtained from one concrete beam.
- Finally, the present invention relates to a reinforced hollow concrete pile for pile driving,, wherein the pile extends in a first direction and comprises
- a pile head section,
- a pile bottom section, and
- a hollow core extending in the first direction between the pile head section and the pile bottom section,
- According to an embodiment, the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- The rebars or tendon wires provide the concrete pile with additional strength, so the piler may better withstand the impact of a hammer head during pile driving. When rebars or tendon wires are present, the reinforcement can be placed such that the rebars or tendon wires are located within a circumference of the reinforcement, or such that the rebars or tendon wires are located outside the circumference of the reinforcement.
- According to an embodiment, the reinforcement is in the form of a metal spiral.
- A spiral is easily introduced in the hollow core or wrapped around tendon wires, and a pitch of the spiral may be adapted to a desired number to provide the required reinforcement. The helix of the pile head section may for example comprise 3-12 windings having a pitch of 1-10 cm. Preferably, the helix comprises 5-9 windings having a pitch of 4-5 cm.
- According to an embodiment, the pile head section extends over a length of 30-100 cm, preferably over a length of 40-70 cm, such as 60 cm.
- According to an embodiment, the pile bottom section extends over a length of 10-50 cm, preferably over a length of 20-40 cm, such as 30 cm.
- According to an embodiment, a diameter of the hollow core is 40-70% of a width of the reinforced hollow concrete pile, preferably 50-60%.
- The present invention will now be illustrated with reference to the drawing where
-
Fig. 1A-1D show a process of providing a reinforced hollow pile according to an embodiment of the invention; -
Fig. 2A shows a longitudinal cross section of a reinforced hollow pile; -
Fig. 2B shows a cross section B-B of the reinforced hollow pile at a level of a middle section; and -
Fig. 2C shows a cross section C-C of the reinforced hollow pile at a level of a middle section. -
Fig. 1A shows a cross sectional view of a multitude oftendon wires 100 that extend in a longitudinal direction. Thetendon wires 100 are provided above a supportingsurface 110, under whichheating conduits 120 extend. In this embodiment, thetendon wires 100 are arranged in sets of fourtendon wires 100, such that of each set a first and asecond tendon wire 100 are provided in a first plane substantially parallel to the supporting surface, and a third and afourth tendon wire 100 are provided in a second plane substantially parallel to the supportingsurface 110. Of each set oftendon wires 100 the first and thethird tendon wire 100 are provided in a third plane substantially perpendicular to the supportingsurface 110, and the second and thefourth tendon wire 100 in a fourth plane substantially perpendicular to the supportingsurface 110. -
Fig. 1B shows a cross section of the bottom part of adevice 130 for providing a firstconcrete mixture 153. In this embodiment, thedevice 130 is anconcrete extruder 130 provided withwheels 131 which enable theextruder 130 to drive in the longitudinal direction over thesupport surface 110 while extruding concrete. In this embodiment theextruder 130 comprises fourscrews 132. Theextruder 130 is aligned such that eachscrew 132 is positioned substantially centered with respect to the fourtendon wires 100 of each set oftendon wires 100. The firstconcrete mixture 153 is extruded by means of four sets of dies and mandrels which are shaped to produce the required cross section as shown inFig. 1C . The fourtendon wires 100 of a set oftendon wires 100 are embedded in the first concrete mixture. The extruder is furthermore provided with guidingsurfaces 140 which are aligned with the upright side walls of the dies, that guide the first concrete mixture being extruded and assist in shaping a concrete profiledhollow beam 150 having ahollow core 151 as shown inFig. 1C . -
Fig. 1D shows a cross section of the concretehollow beam 150 having ahollow core 151 at the level of a pile head andbottom section 152. A portion of concrete in the upper wall of the beam is removed from one or more pile head/bottom sections, such that thehollow core 151 of the concretehollow beam 150 is exposed. One ormore reinforcements 200 are then placed in thehollow core 151, and thehollow core 151 and the space of the removed wall part of the pile head/bottom section 152 is filled with a secondconcrete mixture 154, as shown inFigs. 2A and2C . Theconcrete beam 150 is then heated by means of theheating conduits 120 and allowed to set to yield the reinforced hollowconcrete beam 150. Thebeam 150 is then cut through at the locations of thereinforcement 200 in the pile head/bottom section(s), whereby multiple hollow reinforced piles are obtained having a reinforced head and a reinforced bottom. -
Fig. 2A shows a longitudinal cross section of an end part of the finished reinforced hollowconcrete pile 250 for pile driving. -
Fig. 2B shows a cross section A-A of the reinforced hollowconcrete pile 250 for pile driving at the level of a middle section between thepile head section 152 and a pile bottom section. -
Fig. 2C shows a cross section C-C of the reinforced hollowconcrete pile 250 for pile driving at the level of the pile head. - The
pile head section 152 comprises thereinforcement 200 which extends in the longitudinal direction of theconcrete pile 250 and which in this embodiment is in the form of a reinforcing metalhelical wire 201 which is fixed in shape by means ofwires 202 extending in the axial direction of the helix, and which are fixed to thehelical wire 201. Thehollow core 151 is filled with the secondconcrete mixture 154, resulting in the reinforcingmetal helix 200 being embedded in the concrete mixture. The middle section comprises thehollow core 151 extending between thepile head section 152 and thepile bottom section 152.
Claims (15)
- A method for providing a reinforced hollow concrete pile for pile driving, wherein the method comprises the steps of:
providing a concrete beam having a hollow core,- removing a portion of concrete from a pile head section and/or a pile bottom section of the concrete beam,- placing a reinforcement in the pile head section and/or the pile bottom section,- filling the pile head section and/or the pile bottom section with a concrete mixture,- allowing the concrete to set to yield the reinforced hollow concrete pile for pile driving. - The method according to claim 1, wherein the concrete pile having a hollow core is provided by a wet casting method, a slip forming method or an extrusion method.
- The method according to claim 2, wherein the concrete pile having a hollow core is provided by an extrusion method.
- The method according to any of the preceding claims, wherein the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- The method according to any of the preceding claims, wherein the second concrete mixture is compacted after filling the pile head section and/or the pile bottom section with a second concrete mixture.
- The method according to any of the preceding claims, wherein setting of the first concrete mixture and the second concrete mixture is facilitated by heating.
- The method according to any of the preceding claims, wherein the reinforcement comprises a metal helix.
- The method according to any of the preceding claims, wherein after the step of allowing the first concrete mixture and the second concrete mixture to set, the reinforced hollow concrete beam is cut transversally at the level of the pile head section and/or pile bottom section.
- The method according to claim 8, wherein the reinforced concrete pile is cut transversely at the level of the pile head section and/or pile bottom section such that mutiple reinforced hollow concrete piles are obtained from one concrete beam.
- A reinforced hollow concrete pile for pile driving,, wherein the pile extends in a first direction and comprises- a pile head section,- a pile bottom section, and- a hollow core extending in the first direction between the pile head section and the pile bottom section,wherein the pile head section and/or the pile bottom section comprises a reinforcement embedded in a concrete mixture.
- The concrete pile according to claim 10, wherein the concrete pile having a hollow core comprises rebars or tendon wires extending in a longitudinal direction of the pile.
- The concrete pile according to any of the claims 10 or 11, wherein the reinforcement is in the form of a metal spiral.
- The concrete pile according to any of the claims 10 to 12, wherein the pile head section extends over a length of 30-100 cm, preferably over a length of 40-70 cm, such as 60 cm.
- The concrete pile according to any of the claims 10 to 13, wherein the pile bottom section extends over a length of 10-50 cm, preferably over a length of 20-40 cm, such as 30 cm.
- The concrete pile according to any of the claims 10 to 14, wherein a diameter of the hollow core is 40-70% of a width of the reinforced hollow concrete pile, preferably 50-60%.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2031784A NL2031784B1 (en) | 2022-05-05 | 2022-05-05 | A method for providing a concrete pile and a concrete pile |
Publications (1)
Publication Number | Publication Date |
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EP4273327A1 true EP4273327A1 (en) | 2023-11-08 |
Family
ID=82850535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP23171385.0A Pending EP4273327A1 (en) | 2022-05-05 | 2023-05-03 | A method for providing a concrete pile and a concrete pile |
Country Status (2)
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EP (1) | EP4273327A1 (en) |
NL (1) | NL2031784B1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB994578A (en) | 1963-01-25 | 1965-06-10 | Spiroll Corp Ltd | A machine for extruding a hollow cored concrete product |
WO2010147306A2 (en) * | 2009-06-19 | 2010-12-23 | (주)하경엔지니어링 | Synthetic phc pile, production method of synthetic phc pile and construction process of synthetic phc pile |
KR101777760B1 (en) * | 2016-11-03 | 2017-09-26 | 한국도로공사 | PHC Pile comprising Sprial Hoop |
CN111472352A (en) * | 2020-05-18 | 2020-07-31 | 天津大学建筑设计研究院 | Separated reinforcement pipe pile and reinforcement method and construction method thereof |
CN211898332U (en) * | 2020-02-28 | 2020-11-10 | 许顺良 | Prefabricated building structure |
CN114045822A (en) * | 2021-11-19 | 2022-02-15 | 无锡市大筑岩土技术有限公司 | Anti-pulling hollow pile and construction method thereof |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1031876C2 (en) * | 2005-05-25 | 2007-01-04 | Betonson B V | Securing reinforcing band around concrete pile, comprises securing band around set pile and then tightening or pressing it into place |
-
2022
- 2022-05-05 NL NL2031784A patent/NL2031784B1/en active
-
2023
- 2023-05-03 EP EP23171385.0A patent/EP4273327A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB994578A (en) | 1963-01-25 | 1965-06-10 | Spiroll Corp Ltd | A machine for extruding a hollow cored concrete product |
WO2010147306A2 (en) * | 2009-06-19 | 2010-12-23 | (주)하경엔지니어링 | Synthetic phc pile, production method of synthetic phc pile and construction process of synthetic phc pile |
KR101777760B1 (en) * | 2016-11-03 | 2017-09-26 | 한국도로공사 | PHC Pile comprising Sprial Hoop |
CN211898332U (en) * | 2020-02-28 | 2020-11-10 | 许顺良 | Prefabricated building structure |
CN111472352A (en) * | 2020-05-18 | 2020-07-31 | 天津大学建筑设计研究院 | Separated reinforcement pipe pile and reinforcement method and construction method thereof |
CN114045822A (en) * | 2021-11-19 | 2022-02-15 | 无锡市大筑岩土技术有限公司 | Anti-pulling hollow pile and construction method thereof |
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NL2031784B1 (en) | 2023-11-14 |
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