CN105386441A - PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile - Google Patents
PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile Download PDFInfo
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- CN105386441A CN105386441A CN201510679770.8A CN201510679770A CN105386441A CN 105386441 A CN105386441 A CN 105386441A CN 201510679770 A CN201510679770 A CN 201510679770A CN 105386441 A CN105386441 A CN 105386441A
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- pvc pipe
- recycled concrete
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- steel
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- 239000004567 concrete Substances 0.000 title claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 230000002787 reinforcement Effects 0.000 claims abstract description 24
- 210000002435 tendon Anatomy 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 5
- 239000011513 prestressed concrete Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000004800 polyvinyl chloride Substances 0.000 description 52
- 229920000915 polyvinyl chloride Polymers 0.000 description 51
- 238000010276 construction Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- E02D5/58—Prestressed concrete 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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0007—PVC
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)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile mainly formed by a PVC pipe, a round reinforcement cage framework, cross steel ribs and recycled concrete. The round reinforcement cage framework and the cross steel ribs are arranged in the PVC pipe, and a round inner cavity is formed in the PVC pipe by the recycled concrete. The round reinforcement cage framework is formed by welding longitudinal prestressed tendons and spiral stirrups. A PVC pipe wrapped pile body resistant to corrosion, light and high in strength can be effectively prevented from being corroded, the corrosion problem of the tubular pile is solved, and the durability of a pile foundation is improved. The inner supporting cross steel ribs can fully achieve the respective advantages of steel, prestressed reinforcement and concrete, the stress performance of the recycled concrete is improved, the bearing capacity and stability of the single pile are improved, the lateral rigidity of the pile body is increased, and transverse deformation is reduced. Waste concrete is fully utilized as recycled aggregate, and application and popularization of the recycled concrete in building foundation engineering are facilitated.
Description
Technical Field
The invention belongs to the field of pile foundation engineering in building foundation engineering, and particularly relates to a cross-shaped prestressed recycled concrete pipe pile wrapped with a PVC pipe.
Background
With the rapid development of the world economy, the reinforced concrete structure enters a period of high-speed development, and the construction of a newly-built building and the demolition of an old building can generate a large amount of waste concrete. The waste concrete is fully utilized, the quantity of construction waste can be effectively reduced, the pollution of the construction waste to the natural environment is reduced, the environment is protected, and the recycled aggregate concrete prepared from recycled aggregate can reduce the exploitation of natural aggregate in construction engineering, so that the aims of saving natural gravel resources and protecting the environment are fulfilled. However, due to the presence of the old mortar, the properties of the recycled coarse aggregate are greatly different from those of the natural coarse aggregate, such as low apparent density, high crushing index, high porosity and high water absorption. Compared with common concrete, the recycled concrete has differences in physical, mechanical and durability properties, and when the recycled aggregate is applied to a pile foundation, a new construction process is required to improve the bearing capacity and durability of a pile body.
The prestressed concrete pipe pile has the advantages of reliable pile body quality, high bearing capacity, strong adaptability and the like, and can be widely applied to house building engineering, road bridges, harbor wharfs and ocean engineering. For the reinforced concrete pile serving in oceans, ports, saline-alkali areas, underground water or inland areas with high concentration of corrosive media in soil, if protective measures are not taken, the pile body is subjected to corrosion of corrosive substances for a long time, such as chloride ion permeation, sulfate corrosion, freeze-thaw cycle and the like, so that the pile body is seriously degraded, the service life is shortened, and the problem of pile foundation durability is very prominent.
The steel reinforced concrete structure can give full play to the respective advantages of steel and concrete, is a structure with high bearing capacity, good ductility and good earthquake resistance, is widely applied to domestic and foreign building structures at present, but is less applied to pile foundations, in particular to prestressed pipe piles.
At present, the country advocates a policy of 'replacing steel with plastics', encourages the use of the plastic products and actively promotes novel chemical building materials. Polyvinyl chloride (PVC) materials are widely used in the fields of construction, industry, agriculture, electronics, medical care, automobiles, etc. because of their excellent chemical resistance, electrical insulation, flame retardancy, geometric stability, light weight, high strength, and easy processing. Nevertheless, according to the current traditional construction technology, the precast pile needs a plurality of procedures such as formwork erecting and formwork removing, a large number of steel moulds are consumed, and the workload and the construction cost are increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing the externally-coated PVC pipe internally-supported cross-shaped prestressed recycled concrete pipe pile which has good pile foundation durability and strong bearing capacity and deformation resistance of a single pile.
In order to solve the technical problems, the invention adopts the following technical scheme:
a PVC pipe internally wrapped and internally supported cross-shaped prestressed recycled concrete pipe pile is mainly made of a PVC pipe, a circular reinforcement cage framework, cross-shaped steel ribs and recycled concrete, wherein the circular reinforcement cage framework and the cross-shaped steel ribs are arranged in the PVC pipe (namely the PVC pipe is externally wrapped with longitudinal prestressed ribs, spiral stirrups and the cross-shaped steel ribs), the recycled concrete is poured in the pipe, the prestressed ribs are tensioned, the recycled concrete is uniformly and compactly arranged along the periphery of the PVC pipe by adopting a centrifugal process, and the recycled concrete forms a circular inner cavity in the PVC pipe; the circular reinforcement cage framework is formed by welding a longitudinal prestressed tendon and a spiral stirrup.
The PVC pipe is formed by splicing an upper semicircular PVC pipe and a lower semicircular PVC pipe, and the joint is sealed and firmly bonded by using a PVC adhesive.
The longitudinal prestressed tendons adopt steel bars for prestressed concrete, the longitudinal prestressed tendons are uniformly arranged along the circumference, and the distance between the longitudinal prestressed tendons is not less than 6 cm; the spiral stirrup adopts a low-carbon steel hot-rolled disc strip or a cold-drawn low-carbon steel wire for a concrete product, and the diameter of the spiral stirrup is 4-8 mm.
The cross-shaped steel rib is formed by connecting two strip-shaped steel plates into a cross shape through mortise and tenon joints and is welded with the spiral stirrups, the steel used by the strip-shaped steel plates is Q215B or Q235B, the width of each internal bracing steel plate is 40 mm-80 mm, the thickness of each internal bracing steel plate is 10 mm-20 mm, and the distance between each internal bracing is 1 m; or the crossed steel rib is formed by cross welding two reinforcing steel bars with the diameter of more than 25 mm.
The recycled concrete consists of new mortar and recycled coarse aggregate, the grain size range of the recycled coarse aggregate is 5-25 mm, and the strength grade is C50-C60.
Above-mentioned outsourcing PVC intraductal crisscross prestressing force recycled concrete tubular pile that props still includes end plate and stake cover hoop, and the cross reinforcing bar welds with spiral stirrup and end plate, and the three arranges with one heart.
Aiming at the problems of the existing concrete pipe pile, the inventor gives full play to the advantages of the PVC pipe, the PVC pipe and the recycled concrete are combined, and a brand new combined component, namely the PVC pipe wrapped with the PVC pipe internally supported cross prestressed recycled concrete pipe pile is designed and manufactured, and mainly comprises the PVC pipe, a circular steel reinforcement cage framework, cross steel ribs and recycled concrete, wherein the circular steel reinforcement cage framework and the cross steel ribs are arranged in the PVC pipe, and the recycled concrete forms a circular inner cavity in the PVC pipe; the circular reinforcement cage framework is formed by welding a longitudinal prestressed tendon and a spiral stirrup. The corrosion-resistant, light and high-strength PVC pipe externally wraps the pile body, so that the pile body can be effectively prevented from being corroded, the problem of corrosion of the pipe pile is solved, and the durability of the pile foundation is improved; the cross steel rib of the inner support can fully exert the respective advantages of steel, prestressed reinforcement and concrete, improve the stress performance of recycled concrete, improve the bearing capacity and stability of a single pile, increase the lateral rigidity of a pile body and reduce the transverse deformation; the waste concrete is fully utilized as the recycled aggregate, and the popularization and the application of the recycled concrete in the building foundation engineering are facilitated.
Compared with the traditional concrete pipe pile, the concrete pipe pile has the following outstanding advantages:
1. the pile body is wrapped by the corrosion-resistant, light and high-strength PVC pipe, so that corrosion of a corrosive medium to the prestressed pile can be effectively prevented, the pile body is prevented from being degraded, and the problem of durability of the pile foundation in a corrosive environment is solved;
2. the internal bracing cross-shaped steel rib can give full play to respective advantages of steel, prestressed reinforcement and concrete, improve the stress performance of recycled concrete, improve the bearing capacity and stability of a single pile, increase the lateral rigidity of a pile body, reduce transverse deformation and reduce the size of a cross section.
The PVC pipe can be used as a construction template for pouring concrete, so that a steel mould used in the traditional construction process is saved, a template removal process is omitted, the construction speed is accelerated, and the economic benefit is improved;
4. the PVC pipe is wrapped outside to effectively protect the internal concrete, so that the thickness of the protective layer can be reduced, the size of the pipe pile can be reduced on the premise of meeting the requirement of bearing capacity, the material is saved, and the manufacturing cost is reduced;
5. the construction waste is fully utilized as the recycled aggregate, the popularization and the application of the recycled concrete in the construction foundation engineering and the recycling of the construction waste are facilitated, and the effect of protecting the environment is achieved.
Drawings
Fig. 1 is a schematic structural view of a cross-shaped prestressed recycled concrete pipe pile wrapped with a PVC pipe.
Fig. 2 is a cross-sectional view of the pile body of the recycled concrete pile of fig. 1 along the a-a cutting line.
Fig. 3 is a cross-sectional view of the pile body of the recycled concrete pile of fig. 1 along a B-B cutting line.
Fig. 4 is a cross-sectional view of the pile body of the recycled concrete pile of fig. 1 along a C-C cutting line.
Fig. 5 is a schematic view of recycled concrete in the recycled concrete pipe pile of fig. 1.
In the figure: 1PVC pipe; 2, arranging spiral stirrups in the area; 3, regenerating concrete; 4 longitudinal prestressed tendons; 5, a non-encryption area spiral stirrup; 6, cross-shaped steel ribs; 7 piles of hoops; 8, end plates; 9, original natural aggregate; 10 adhering old mortar; 11, new mortar.
Detailed Description
As shown in fig. 1 to 5, the tube pile of the invention is wrapped with PVC tube and supported with cross prestressed recycled concrete (external diameter 400mm, wall thickness 95mm, length 9m,), and is mainly made of PVC tube 1, round steel reinforcement cage skeleton, cross steel rib 6 and recycled concrete, the round steel reinforcement cage skeleton and cross steel rib are placed in the PVC tube (i.e. the PVC tube is wrapped with longitudinal prestressed rib, spiral stirrup, cross steel rib), recycled concrete 3 is poured in the tube, the prestressed rib is stretched, the recycled concrete is evenly compacted along the circumference of the PVC tube by centrifugal process, the recycled concrete forms a round inner cavity in the PVC tube; the circular reinforcement cage framework is formed by welding a longitudinal prestressed tendon and a spiral stirrup. Wherein,
the PVC pipe is formed by splicing an upper semicircular PVC pipe and a lower semicircular PVC pipe, the outer diameter of the PVC pipe is 400mm, the pipe thickness of the PVC pipe is 5mm, and the PVC adhesive is used for firmly sealing and adhering the joint.
The longitudinal prestressed tendons 4 adopt steel bars 10A10.7 for prestressed concrete, the longitudinal prestressed tendons are uniformly arranged along the circumference, and the distance between the longitudinal prestressed tendons is not less than 6 cm; the spiral stirrup is made of low-carbon steel hot-rolled disc strips, the diameter of each spiral stirrup is 4mm, and the spiral stirrup 2 (L) in the encryption area1Within 2m of the two ends of the tubular pile), the thread pitch is 45mm, and the spiral stirrup 5 (L) is arranged in the non-encryption area2) The thread pitch is 80mm, and the thickness of the protective layer is 20 mm.
The cross-shaped steel rib is formed by connecting two strip-shaped steel plates into a cross shape through mortise and tenon joints and is welded with the spiral stirrups, the steel used by the strip-shaped steel plates is Q235B, the width of each internal bracing steel plate is 50mm, the thickness of each internal bracing steel plate is 20mm, and the distance between each internal bracing steel plate is 1 m.
The recycled concrete consists of new mortar and recycled coarse aggregate, the grain size range of the recycled coarse aggregate is 5-25 mm, and the strength grade is C60.
The recycled concrete pipe pile further comprises an end plate 8 and a pile sleeve hoop 7, the cross-shaped steel rib is welded with the spiral stirrup and the end plate, and the cross-shaped steel rib, the spiral stirrup and the end plate are arranged concentrically. The end plate is manufactured by a certain manufacturer, and the steel used is Q235B; the pile sleeve is made of Q235B steel and is rolled into a cylinder by a steel plate, and the seam is welded and is round.
Manufacturing method
1. According to the size of the round pile, the cross-shaped steel rib, the end plate and the pile casing hoop are manufactured.
2. And welding the circular reinforcement cage framework. And welding the stirrups to the prestressed reinforcements in a spiral manner by adopting a sliding welding machine according to the size of the circular pile and the thickness of the protective layer, wherein the prestressed reinforcements are uniformly arranged along the circumference.
3. And (5) mounting a circular reinforcement cage framework. And (3) placing the welded reinforcement cage framework, the cross-shaped steel rib, the end plate and the pile casing hoop into the lower half PVC pipe, wherein the pile end plate and the pile casing hoop are uniformly and continuously welded firmly, and the reinforcement cage framework, the cross-shaped steel rib and the PVC pipe are concentrically placed.
4. And (6) pouring concrete. Concrete is poured into the lower half PVC pipe by a feeding machine, and the lower half PVC pipe is uniformly filled with the recycled concrete by uniformly distributing the material along the length direction of the PVC pipe according to a feeding method of firstly feeding the middle, then feeding the two ends and then feeding the middle.
5. And (5) closing the mold. The upper half PVC pipe is placed above the lower half PVC pipe, and the upper PVC pipe and the lower PVC pipe are fixedly sleeved by the hoop, so that the PVC pipe is prevented from loosening and leaking during centrifugal operation.
6. And (4) prestress tension. And a jack type tensioning machine is adopted to perform one-time integral tensioning on the prestressed tendons after the die assembly.
7. And (5) centrifugal forming. And (3) hoisting the pipe pile subjected to die assembly to a centrifugal machine, gradually accelerating the pipe pile according to low-speed, low-medium-speed, medium-speed and high-speed centrifugal speeds, and centrifuging for 15-20 minutes to ensure that the recycled concrete is uniformly and compactly distributed along the periphery of the PVC pipe and a circular inner cavity is formed in the pipe.
8. And (5) performing primary steam curing. And (3) hanging the centrifugally formed pipe pile into a normal-pressure steam curing pool for primary steam curing, standing for 1-2 h at normal temperature, slowly heating to 90-100 ℃, and curing for 4-8 h at constant temperature, so that the compressive strength of a concrete test piece cured by the pipe pile under the same conditions is 45 Mpa.
9. And (4) performing prestress tension releasing on the centrifugal pile subjected to primary steam curing, and applying prestress to the pile body. And sealing the PVC interface by using a PVC binder, and naturally curing to reach the factory strength, thus leaving the factory.
Claims (6)
1. A PVC pipe wrapped internally with a crossed prestressed recycled concrete pipe pile is characterized by being mainly made of a PVC pipe, a circular reinforcement cage framework, crossed steel ribs and recycled concrete, wherein the circular reinforcement cage framework and the crossed steel ribs are arranged in the PVC pipe, and the recycled concrete forms a circular inner cavity in the PVC pipe; the circular reinforcement cage framework is formed by welding a longitudinal prestressed tendon and a spiral stirrup.
2. The PVC pipe internally supported cross-shaped prestressed recycled concrete pipe pile of claim 1, which is characterized in that: the PVC pipe is formed by splicing an upper semicircular PVC pipe and a lower semicircular PVC pipe.
3. The PVC pipe internally supported cross-shaped prestressed recycled concrete pipe pile of claim 1, which is characterized in that: the longitudinal prestressed tendons are steel bars for prestressed concrete, the longitudinal prestressed tendons are uniformly arranged along the circumference, and the distance between the longitudinal prestressed tendons is not less than 6 cm; the spiral stirrup is made of low-carbon steel hot-rolled disc strips or cold-drawn low-carbon steel wires for concrete products, and the diameter of the spiral stirrup is 4-8 mm.
4. The PVC pipe internally supported cross-shaped prestressed recycled concrete pipe pile of claim 1, which is characterized in that: the cross steel rib is formed by connecting two strip steel plates into a cross shape through a mortise and tenon joint and is welded with the spiral stirrup, the steel used by the strip steel plates is Q215B or Q235B, the width of each internal bracing steel plate is 40 mm-80 mm, the thickness of each internal bracing steel plate is lOmm-20 mm, and the distance between each internal bracing is 1 m; or the cross-shaped steel rib is formed by cross welding two reinforcing steel bars with the diameter of more than 25 mm.
5. The PVC pipe internally supported cross-shaped prestressed recycled concrete pipe pile of claim 1, which is characterized in that: the recycled concrete is composed of new mortar and recycled coarse aggregate, the grain size range of the recycled coarse aggregate is 5-25 mm, and the strength grade is C50-C60.
6. The PVC pipe internally supported cross-shaped prestressed recycled concrete pipe pile as claimed in claim 1, further comprising an end plate and a pile sleeve hoop, wherein the cross-shaped steel rib is welded with the spiral stirrup and the end plate, and the cross-shaped steel rib, the spiral stirrup and the end plate are concentrically arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510679770.8A CN105386441A (en) | 2015-10-19 | 2015-10-19 | PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510679770.8A CN105386441A (en) | 2015-10-19 | 2015-10-19 | PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile |
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| Publication Number | Publication Date |
|---|---|
| CN105386441A true CN105386441A (en) | 2016-03-09 |
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| CN201510679770.8A Pending CN105386441A (en) | 2015-10-19 | 2015-10-19 | PVC pipe wrapped inner supporting cross prestress recycled concrete tubular pile |
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| CN (1) | CN105386441A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106869015A (en) * | 2017-02-21 | 2017-06-20 | 南昌大学 | A kind of FRP pipes cast-in-place with half half prefabricated regeneration concrete prestressing force overlapping bridge pier and preparation method |
| CN110616852A (en) * | 2019-07-19 | 2019-12-27 | 三一筑工科技有限公司 | Concrete support column and manufacturing method thereof |
| CN110965701A (en) * | 2019-12-06 | 2020-04-07 | 华侨大学 | Internal high-strength spiral stirrup steel pipe-ultrahigh-strength spiral steel fiber concrete combined column and construction method thereof |
| WO2020072015A1 (en) | 2018-10-04 | 2020-04-09 | Sentez İnşaat Yazilim Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Prestressed reinforced concrete pipe pile and a production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106869015A (en) * | 2017-02-21 | 2017-06-20 | 南昌大学 | A kind of FRP pipes cast-in-place with half half prefabricated regeneration concrete prestressing force overlapping bridge pier and preparation method |
| WO2020072015A1 (en) | 2018-10-04 | 2020-04-09 | Sentez İnşaat Yazilim Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Prestressed reinforced concrete pipe pile and a production method thereof |
| EP3861173A4 (en) * | 2018-10-04 | 2022-06-29 | Sentez Insaat Denizcilik Sanayi ve Ticaret Limited Sirketi | Prestressed reinforced concrete pipe pile and a production method thereof |
| CN110616852A (en) * | 2019-07-19 | 2019-12-27 | 三一筑工科技有限公司 | Concrete support column and manufacturing method thereof |
| CN110965701A (en) * | 2019-12-06 | 2020-04-07 | 华侨大学 | Internal high-strength spiral stirrup steel pipe-ultrahigh-strength spiral steel fiber concrete combined column and construction method thereof |
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Application publication date: 20160309 |