CN117468643A - Winding forming composite material spring type stirrup - Google Patents
Winding forming composite material spring type stirrup Download PDFInfo
- Publication number
- CN117468643A CN117468643A CN202311282065.5A CN202311282065A CN117468643A CN 117468643 A CN117468643 A CN 117468643A CN 202311282065 A CN202311282065 A CN 202311282065A CN 117468643 A CN117468643 A CN 117468643A
- Authority
- CN
- China
- Prior art keywords
- stirrup
- composite
- composite material
- spring
- set forth
- 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
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- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000004804 winding Methods 0.000 title claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 239000011347 resin Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 229920002748 Basalt fiber Polymers 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000005007 epoxy-phenolic resin Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229920006305 unsaturated polyester Polymers 0.000 claims description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 2
- 229920002554 vinyl polymer Polymers 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 claims 1
- 238000004381 surface treatment Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 238000005452 bending Methods 0.000 abstract description 11
- 239000011150 reinforced concrete Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000003733 fiber-reinforced composite Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004046 wet winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
-
- 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
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a winding forming composite material spring stirrup, which is characterized in that: adopting an automatic process to prepare, and winding and tensioning the composite stirrup by an integrated wet method; the composite material is a continuous fiber reinforced resin matrix composite material; the composite stirrup is divided into rectangular spring stirrups and circular spring stirrups according to the shape of the composite stirrups. The spring stirrup can be compressed towards the center along the two axial ends, is convenient to transport, and is bound with the longitudinal bar after being stretched in a construction site. The invention effectively relieves the fiber curl of the bending section of the stirrup, fully exerts the tensile strength of the stirrup, can be matched with the composite material bars for use, effectively improves the durability of the reinforced concrete structure, can realize industrial production, and is applied to severe service environments such as ocean engineering and the like.
Description
Technical Field
The invention relates to the field of composite material structures, in particular to a composite material stirrup which has high strength, good toughness, corrosion resistance and high production efficiency, is particularly suitable for beam, plate and column members, and can be used for structures such as ocean engineering, non-magnetic/electric insulation structures, foundation pit guard piles and the like.
Background
The traditional FRP rib is mainly produced through a pultrusion process. Before the resin is solidified, the FRP stirrup is formed by bending the pultruded FRP stirrup with circular section into a stirrup with a stirrup body in lap joint. The pultruded stirrup relies on the bonding of the legs of the overlap region to the concrete to transfer the tensile stress. Tests show that when the concrete member is damaged, the traditional pultruded FRP stirrup is not broken, but the lap joint section is damaged by bonding sliding. The FRP rib bending process also causes the inner side fiber of the bending section to be curled, and when the FRP rib is pulled, the outer side fiber is stressed before the inner side fiber to cause stress concentration, so that the tensile strength of the bending section of the FRP rib is reduced. The tensile strength of the bending section of the FRP stirrup is only 30% -60% of that of the straight section. The reduction of the tensile strength of the bending section of the FRP stirrup also leads to the common failure mode of the FRP stirrup when the concrete beam is sheared, namely the FRP stirrup is broken at the bending section. If the oblique fracture passes just through the curved section of the FRP stirrup, its tensile strength may be further reduced. When the structure reaches the bearing capacity limit state, the stress level of the traditional pultrusion FRP stirrup is lower, and the high-tensile-strength performance of the material is not fully utilized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the novel composite stirrup with high strength, good toughness, corrosion resistance and high production efficiency, which can effectively relieve fiber curl of the bending section of the stirrup, can be used together with the composite stirrup, and can effectively improve the durability of the reinforced concrete structure.
The invention adopts the technical scheme that: a winding forming composite material spring stirrup is prepared by adopting an automatic process, and an integrated wet winding tensioning forming composite material stirrup is adopted; the composite material is a continuous fiber reinforced resin matrix composite material, and the composite material stirrups are divided into round spring stirrups and rectangular spring stirrups according to the shape of the composite material stirrups.
Preferably, the continuous fiber is at least one of carbon fiber, glass fiber, basalt fiber, aramid fiber and hybrid fiber.
Preferably, the resin is at least one of unsaturated polyester, vinyl resin, epoxy resin, phenolic resin and various structural adhesives.
Preferably, the core mold is one of a steel pipe, a winding pipe, a wooden pipe, a PVC/PE plastic pipe and the like.
Preferably, the surface bonding treatment technique is at least one of sand blasting, winding extrusion and mechanical scoring.
Preferably, the composite stirrup is prepared by adopting an integrated wet fiber winding molding process.
Preferably, the cross section of the composite stirrup is rectangular or circular.
Preferably, the composite material closed stirrup is prepared by one of large-angle continuous winding, variable-angle continuous winding and multi-angle combined continuous winding.
Preferably, the composite material continuous spring stirrup is prepared by unidirectional winding or bidirectional winding.
Preferably, the composite stirrup single limb adopts a round shape or a flat bar shape.
The beneficial effects are that:
(1) The integrated winding forming fiber reinforced composite stirrup has better corrosion resistance than the traditional stirrup, low maintenance cost and better comprehensive benefit than the traditional stirrup.
(2) Compared with the traditional FRP stirrups formed by pultrusion, the novel fiber reinforced plastic stirrup has the advantages that the material utilization efficiency is high, the fiber curling phenomenon of the bending section of the stirrups is remarkably relieved, and the strength of the bending section is remarkably improved.
(3) The method solves the practical common problems of easy corrosion of concrete members and the like under severe service conditions, prolongs the service life of the structure, and reduces the influence of structural corrosion failure on society based on the advanced light high-strength fiber reinforced composite material.
(4) The composite stirrup manufactured by the method adopts an integrated fiber winding and forming process to realize mechanized and automatic production, and has the advantages of less operation workers, high winding speed, high labor productivity and low cost; meanwhile, after the process conditions are determined, the material performance can be fully utilized, and the wound product has stable and accurate quality, so that the reliability of the product is high.
Drawings
FIG. 1 is a schematic illustration of the preparation of a spring composite stirrup of the present invention;
FIG. 2 is a unidirectional wound round continuous spring composite stirrup of the present invention;
FIG. 3 is a unidirectional wound rectangular continuous spring composite stirrup of the present invention;
fig. 4-5 are schematic illustrations of embodiments 3-4 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
Example 1
As shown in figures 1-3, the invention is a continuous spring type composite stirrup, which adopts glass fiber and epoxy resin as raw materials and adopts an integrated winding forming process. The method comprises the following specific steps:
(1) Manufacturing a mandrel 1 with a corresponding shape and size according to the use requirement;
(2) The metal thin-wall pipe is used as a core mold 1, a wet fiber winding molding process is adopted, after bundling and gum dipping, the fiber reinforced composite material is directly wound on the metal thin-wall pipe under tension control, and unidirectional winding or bidirectional winding can be adopted for solidification molding.
(3) And demolding the finished product to form the spring stirrup 2 or 3, and carrying out surface sand blasting.
Example 2
As shown in fig. 4-5, a composite stirrup is a spring stirrup 2 or 3, which is used in concrete piles, the longitudinal stirrup is reinforced with steel bars or FRP bars, the spring stirrup is sleeved into the longitudinal stirrup, and the stirrup and the longitudinal stirrup are bound by thin iron wires to form a reinforcement cage.
It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention. The components not explicitly described in this embodiment can be implemented by using the prior art.
Claims (9)
1. A composite stirrup, characterized in that: the single limb of the composite material stirrup is a round or flat strip of the composite material, the composite material is a continuous fiber reinforced resin matrix composite material, and the composite material stirrup is divided into a round spring stirrup and a rectangular spring stirrup according to the form of the composite material stirrup.
2. The composite stirrup as set forth in claim 1, wherein: the composite stirrup is formed by solidifying fibers and resin, wherein the fibers comprise at least one of carbon fibers, glass fibers, basalt fibers, aramid fibers or hybrid fibers. The resin adopts unsaturated polyester, vinyl resin, epoxy resin, phenolic resin and various structural adhesives.
3. The composite stirrup as set forth in claim 1, wherein: the closed stirrup and the continuous spring stirrup are integrally wound, tensioned and molded, and the winding direction of the fiber and the size of the stirrup are precisely controlled by the winding direction controller.
4. The composite stirrup as set forth in claim 1, wherein: the fiber content of the composite stirrup reaches 50% or more.
5. The composite stirrup as set forth in claim 1, wherein: the section of the composite stirrup is round or rectangular.
6. A process for preparing a composite stirrup as set forth in claim 3, wherein the spring stirrup is formed by using a mandrel having a rectangular, circular, triangular or other shape and changing dimensions based on different requirements.
7. A mandrel as claimed in claim 5 wherein: the core mould can be replaced by plastic pipes such as steel pipes, winding pipes, wooden pipes, PVC/PE and the like, and various pipes can be mutually combined.
8. A process for preparing a composite stirrup as set forth in claim 3, wherein the continuous spring stirrup is wound in one direction or in two directions.
9. The composite stirrup as set forth in claim 1, wherein: the surface bonding treatment technology of the composite stirrup adopts sand blasting, winding extrusion and mechanical scoring, and various surface treatment modes can be mutually combined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311282065.5A CN117468643A (en) | 2023-10-07 | 2023-10-07 | Winding forming composite material spring type stirrup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311282065.5A CN117468643A (en) | 2023-10-07 | 2023-10-07 | Winding forming composite material spring type stirrup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117468643A true CN117468643A (en) | 2024-01-30 |
Family
ID=89632187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311282065.5A Pending CN117468643A (en) | 2023-10-07 | 2023-10-07 | Winding forming composite material spring type stirrup |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117468643A (en) |
-
2023
- 2023-10-07 CN CN202311282065.5A patent/CN117468643A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |