CN114875812A - FRP-UHPC shell reinforced prefabricated member and preparation method thereof - Google Patents
FRP-UHPC shell reinforced prefabricated member and preparation method thereof Download PDFInfo
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- CN114875812A CN114875812A CN202210662576.9A CN202210662576A CN114875812A CN 114875812 A CN114875812 A CN 114875812A CN 202210662576 A CN202210662576 A CN 202210662576A CN 114875812 A CN114875812 A CN 114875812A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 179
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 85
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 85
- 230000002787 reinforcement Effects 0.000 claims description 32
- 230000003014 reinforcing effect Effects 0.000 claims description 32
- 239000000835 fiber Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 17
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 229920006231 aramid fiber Polymers 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
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- 239000004568 cement Substances 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 239000004760 aramid Substances 0.000 claims 1
- 229920003235 aromatic polyamide Polymers 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 13
- 238000010276 construction Methods 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 239000011230 binding agent Substances 0.000 description 7
- 230000008439 repair process Effects 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- -1 polymethylene Polymers 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 229920000573 polyethylene Polymers 0.000 description 2
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- 229910021487 silica fume Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses an FRP-UHPC shell reinforced prefabricated part and a preparation method thereof. The prefabricated part comprises a first UHPC shell and a second UHPC shell, wherein two shells are internally provided with grouting sleeves and annular FRP stirrups which are arranged in a staggered manner, when the two shells are assembled, one end of each FRP stirrup in the first UHPC shell penetrates through the edge embedded surface to be inserted into the grouting sleeve in the second UHPC shell for fixing, meanwhile, one end of each FRP stirrup in the second UHPC shell penetrates through the edge embedded surface to be inserted into the grouting sleeve in the first UHPC shell for fixing, then the grouting holes in the outer side walls of the two shells are passed through, grouting and anchoring are performed after the two shells are embedded, so that the two shells are embedded and fixed to form a hollow cylindrical reinforced prefabricated part. The invention can ensure the connection strength of the FRP-UHPC shell reinforced prefabricated member, has convenient installation, wide applicability, simple preparation and low manufacturing cost, and is beneficial to the popularization of building industrialization.
Description
Technical Field
The invention relates to the technical field of structural engineering, in particular to an FRP-UHPC shell reinforced prefabricated part and a preparation method thereof.
Background
In recent years, Reinforced Concrete (RC) bridge columns exposed to marine and offshore environments have been significantly degraded by various harsh natural environments, including dry-wet cycles, freeze-thaw cycles, chloride corrosion, and other physical/chemical causes. These aggressive environments cause the concrete protective layer of the bridge post splash/tidal zone to degrade and the internal steel reinforcement to corrode severely. Therefore, the repair and reinforcement of the damaged reinforced concrete bridge upright post becomes more and more important. Steel plate reinforcement is one of the conventional methods for reinforcing reinforced concrete columns. However, corrosion of the steel plate poses another durability problem. In the past two decades, Fiber Reinforced Polymer (FRP) reinforcement materials are widely used for repairing and reinforcing reinforced concrete structures due to excellent material properties (such as light weight, high strength, corrosion resistance, fatigue resistance and the like), and are ideal materials for repairing damaged reinforced concrete columns. On the other hand, Ultra High Performance Concrete (UHPC) is being widely studied and used in the field of civil engineering because of its ultra high strength, high durability, high impermeability and high toughness. The FRP can enable the UHPC to have the strain strengthening performance after cracking. The combination of the UHPC and the FRP stirrups is more beneficial to exerting the advantages of the UHPC and the FRP stirrups together, for example, the FRP-UHPC shell reinforced prefabricated member can be used in the project of repairing and reinforcing structures, can also be used as a permanent template of a concrete cast-in-place structure to work together with other members, and can be applied to special occasions such as actual marine structures, other corrosive environments and the like.
For example, chinese patent publication No. CN205063374U discloses a reinforcing structure for reinforcing a concrete column, in which a concrete filling space is formed between a reinforcing outer cylinder and the concrete column to be reinforced, and the concrete filling space is filled with concrete to form a concrete layer, so that the bearing capacity and deformation resistance of the concrete column to be reinforced can be greatly improved, thereby improving the anti-seismic performance of the column, and the column can be applied to reinforcing a member requiring a greatly improved bearing capacity. But above-mentioned scheme has some problems, needs another template to pour in the repair works and consolidates, wastes man-hour very extravagant raw materials again promptly, and manufacturing cost is very high, and is very unfavorable for the popularization of building industrialization.
Disclosure of Invention
The invention provides an FRP-UHPC shell reinforcing prefabricated member and a preparation method thereof, which can quickly and effectively repair and reinforce damaged cylindrical members, can ensure the connection strength of the FRP-UHPC shell reinforcing prefabricated member, and has the advantages of convenient installation, wide applicability, simple preparation, low manufacturing cost and contribution to the popularization of building industrialization.
The technical scheme of the invention is as follows:
an FRP-UHPC shell reinforcement preform comprising:
the first UHPC shell is semicircular, a plurality of first grouting sleeves are staggered and stacked on two sides inside the first UHPC shell, one ends of the first grouting sleeves are flush with one side end face of the first UHPC shell, the other ends of the first grouting sleeves are connected with first annular FRP stirrups, the other ends of the first annular FRP stirrups extend to the other side end face of the first UHPC shell and penetrate out to form a first reserved end, first grouting holes are formed in the first grouting sleeves, and inlets of the first grouting holes are arranged on the outer wall of the first UHPC shell;
the second UHPC shell is semicircular, a plurality of second grouting sleeves are staggered and laminated on two sides inside the second UHPC shell, one ends of the second grouting sleeves are flush with one side end face of the second UHPC shell, the other ends of the second grouting sleeves are connected with second annular FRP stirrups, the other ends of the second annular FRP stirrups extend to the other side end face of the second UHPC shell and penetrate out to form a second reserved end, second grouting holes are formed in the second grouting sleeves, and inlets of the second grouting holes are formed in the outer wall of the second UHPC shell;
the first UHPC shell and the second UHPC shell are arranged in equal height symmetry, when the first UHPC shell and the second UHPC shell are assembled, a first reserved end of the first UHPC shell with the same level height is inserted into the second grouting sleeve of the second UHPC shell, a second reserved end of the second UHPC shell is inserted into the first grouting sleeve of the first UHPC shell, and an expanding agent is injected from a grouting hole to fix the first UHPC shell and the second UHPC shell, so that the first UHPC shell and the second UHPC shell are assembled to form a hollow cylindrical reinforcing prefabricated member.
The FRP-UHPC shell reinforced prefabricated member can be used for different working conditions of various projects without pouring concrete by using an additional formwork, the specific size of the FRP-UHPC shell reinforced prefabricated member and the configuration of the FRP stirrups can be designed according to different project purposes, and standardized construction and offshore construction operation can be realized.
The invention has very important application prospect in structural engineering reinforcement, on one hand, the superior performance of the FRP-UHPC material is utilized to protect the structural member to work in a corrosive environment, on the other hand, the UHPC shell applies lateral constraint to the pressed cylindrical member to repair and reinforce the damaged cylindrical member, and the prefabricated member can be industrially produced according to the repair and reinforcement requirements of the structural member and can be assembled and constructed.
Further, a reinforcing sheet is bonded and covered at the splicing part of the first UHPC shell and the second UHPC shell.
The UHPC is a cement-based material, is formed by mixing and stirring high-grade cement, quartz sand, silica fume, building sand, building steel fiber or other non-metallic short fibers (such as polymethylene, polyethylene and the like) by a certain method, does not contain coarse aggregate, and has the compressive strength of more than 150 MPa; the reinforcing sheet can be generally adhered to the upper surface and the lower surface of a connecting area of the first UHPC shell and the second UHPC shell after splicing by a wet adhesion method, so that the connecting strength can be further enhanced, and the integrity of the template is improved.
Further, the reinforcing sheet is bonded by an adhesive, which is one of epoxy resin and expanded cement paste.
The epoxy resin has good bonding strength and chemical resistance, and can help to improve the weather resistance of the permanent template; the cement paste has certain strength and viscosity after being solidified, is low in production cost and can be applied in a large scale; the adoption of any one binder does not affect the achievement of the purpose of the invention.
Further, the reinforced sheet is an FRP sheet, and the FRP sheet is made of one of carbon fiber, glass fiber, aramid fiber, or plastic fiber.
The fiber direction of the FRP sheet can be arranged along the circumferential direction of the shell, the structural strength is enhanced, the FRP sheet made of one or more of carbon fiber, glass fiber, aramid fiber or plastic fiber and the like has excellent performances of light weight, high strength, corrosion resistance, fatigue resistance, low creep deformation and the like, the environmental weather resistance of a permanent template can be ensured, and the FRP sheet can be suitable for more special engineering occasions such as ocean engineering or other corrosive environments and the like.
Furthermore, a plurality of FRP frame studs arranged axially are respectively arranged in the first UHPC shell and the second UHPC shell. The FRP frame studs can be used for strengthening the UHPC shell, so that the UHPC shell is more stable and firm when lateral constraint is applied to the cylindrical member.
Further, the FRP frame vertical bar is made of one of carbon fiber, glass fiber, aramid fiber or plastic fiber. The FRP frame vertical bar prepared by mixing one or more of carbon fiber, glass fiber, aramid fiber or plastic fiber has the excellent performances of light weight, high strength, corrosion resistance, fatigue resistance, low creep deformation and the like.
Further, the first grouting sleeve and the second grouting sleeve are made of stainless steel materials, and threads are formed in the inner side wall of the first grouting sleeve and the second grouting sleeve.
The surface of the inner side of the grouting sleeve is subjected to thread treatment, so that the contact area between the binder and the FRP stirrup can be increased, the binding property is increased, and the binding firmness is improved.
Further, the length of the first reserved end of the first hoop FRP stirrup is 10-20 times of the diameter of the first hoop FRP stirrup; the length of the second reserved end of the second annular FRP hoop is 10-20 times of the diameter of the second annular FRP hoop.
The diameter size of FRP stirrup on the one hand can guarantee the intensity of FRP stirrup itself, is carrying out the fixed back of gomphosis, guarantees holistic concatenation intensity, and the length of the reservation end of on the other hand FRP stirrup is enough long, can guarantee that the reservation end of embedding UHPC casing has sufficient firm power to support holistic tensile, the anti ability of rolling over behind the gomphosis.
Further, the first hoop FRP stirrup and the second hoop FRP stirrup are made of one of carbon fiber, glass fiber, aramid fiber, or plastic fiber.
The FRP stirrup made of one or more of carbon fiber, glass fiber, aramid fiber, and plastic fiber has excellent properties such as light weight, high strength, corrosion resistance, fatigue resistance, and low creep deformation, and generally, after being impregnated with resin, the FRP stirrup is cured by pultrusion process, and may be ribbed or non-ribbed, and the purpose of the present invention is not affected by any FRP stirrup.
The invention also provides a preparation method of the FRP-UHPC shell reinforcement prefabricated member, which comprises the following steps:
s1: splicing the shell:
inserting a first reserved end penetrating through the end faces of two sides of a first UHPC shell into a second grouting sleeve corresponding to a second UHPC shell, and inserting a second reserved end penetrating through the end faces of two sides of the second UHPC shell into a first grouting sleeve corresponding to the first UHPC shell to complete splicing of the first UHPC shell and the second UHPC shell;
s2: fixing the shell:
filling an expanding agent into the first grouting hole and the second grouting hole, so that the expanding agent is filled in a gap between the first grouting sleeve and the second reserved end and a gap between the second grouting sleeve and the first reserved end, and after the expanding agent is dried, fixing the first UHPC shell and the second UHPC shell;
s3: reinforcing the shell:
and after the bonding agent is coated on the reinforcing sheet material, the reinforcing sheet material is adhered to the outer surface of the joint of the first UHPC shell and the second UHPC shell after being embedded, and after the bonding agent is dried, the first UHPC shell and the second UHPC shell are reinforced.
The invention has the beneficial effects that:
1. according to the invention, the FRP stirrups and the grouting sleeves which can be mutually embedded are filled with the binder through the grouting holes, so that the first UHPC shell and the second UHPC shell are combined and fixed into an FRP-UHPC shell prefabricated part formed by combining the UHPC shell and the FRP stirrups; the material used in the invention has high strength, the member has better integrity after connection, excellent mechanical property, good durability and corrosion resistance, can be suitable for more special engineering occasions such as ocean engineering or other corrosive environments, has wider applicability and good application prospect;
2. the FRP-UHPC shell reinforced prefabricated member disclosed by the invention does not need to be additionally provided with a template for pouring concrete in the preparation process, does not need secondary pouring connection, can be directly applied to the working conditions of various projects after splicing and reinforcing are finished, is convenient to install, greatly reduces the construction labor, saves the preparation cost, and can well meet the requirements for realizing standardized construction and offshore construction operation.
Drawings
FIG. 1 is a schematic view of the overall structure of the FRP-UHPC shell reinforcement preform of the invention;
FIG. 2 is a schematic view of the construction of a first UHPC housing according to the invention;
FIG. 3 is a schematic diagram of a second UHPC housing according to the present invention;
fig. 4 is a schematic structural view of the reinforcing sheet in the present invention.
In the figure: first UHPC casing 1, first grout sleeve 101, first hoop FRP stirrup 102, first reservation end 103, first grout hole 104, second UHPC casing 2, second grout sleeve 201, second hoop FRP stirrup 202, second reservation end 203, second grout hole 204, reinforcement sheet 3, FRP frame vertical rib 4.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1 to 4, the present embodiment provides an FRP-UHPC shell reinforcement preform, comprising:
the first UHPC shell 1 is semicircular, a plurality of first grouting sleeves 101 are staggered and stacked on two sides inside the first UHPC shell 1, one end of each first grouting sleeve 101 is flush with the end face of one side of the first UHPC shell 1, the other end of each first grouting sleeve 101 is connected with a first annular FRP (fiber reinforced Plastic) stirrup 102, the other end of each first annular FRP stirrup 102 extends to the end face of the other side of the first UHPC shell 1 and penetrates out of the end face to form a first reserved end 103, each first grouting sleeve 101 is provided with a first grouting hole 104, and the inlet of each first grouting hole 104 is arranged on the outer wall of the first UHPC shell 1;
the second UHPC shell 2 is semicircular, a plurality of second grouting sleeves 201 are staggered and laminated on two sides inside the second UHPC shell 2, one end of each second grouting sleeve 201 is flush with the end face of one side of the second UHPC shell 2, the other end of each second grouting sleeve is connected with a second annular FRP (fiber reinforced plastic) stirrup 202, the other end of each second annular FRP stirrup 202 extends to the end face of the other side of the second UHPC shell 2 and penetrates out to form a second reserved end 203, each second grouting sleeve 202 is provided with a second grouting hole 204, and the inlet of each second grouting hole 204 is arranged on the outer wall of the second UHPC shell 2;
the first UHPC shell 1 and the second UHPC shell 2 are arranged in equal height and symmetry, when the assembly is carried out, the first reserved end 103 of the first UHPC shell 1 with the same level height is inserted into the second grouting sleeve 201 of the second UHPC shell 2, the second reserved end 203 of the second UHPC shell 2 is inserted into the first grouting sleeve 101 of the first UHPC shell 1, and an expanding agent is injected from a grouting hole for fixing, so that the first UHPC shell 1 and the second UHPC shell 2 are assembled to form a hollow cylindrical reinforcing prefabricated member.
The FRP-UHPC shell reinforced prefabricated member can be used for different working conditions of various projects without pouring concrete by using an additional formwork, the specific size of the FRP-UHPC shell reinforced prefabricated member and the configuration of the FRP stirrups can be designed according to different project purposes, and standardized construction and offshore construction operation can be realized.
The invention has very important application prospect in structural engineering reinforcement, on one hand, the superior performance of the FRP-UHPC material is utilized to protect the structural member to work in a corrosive environment, on the other hand, the UHPC shell applies lateral constraint to the pressed cylindrical member to repair and reinforce the damaged cylindrical member, and the prefabricated member can be industrially produced according to the repair and reinforcement requirements of the structural member and can be assembled and constructed.
In this embodiment, the first UHPC housing 1 and the second UHPC housing 2 have the same structure, but are different in that they are structural symmetric parts, and the reserved ends in the two housings are inserted into respective grouting sleeves for embedding, so that each level height forms a circular anchor ear.
In this embodiment, the number of layers of the hoop formed by the prefabricated member can be designed according to the actual construction environment, and enough layers are designed to ensure the structural strength of the prefabricated member and enhance the repairing and reinforcing effects on the cylindrical member.
In the embodiment, the joint of the first UHPC shell 1 and the second UHPC shell 2 is bonded and covered with the reinforcing sheet 3, and the reinforcing sheet 3 is bonded by using an adhesive, wherein the adhesive can be epoxy resin or expanded cement paste.
The UHPC is a cement-based material, is formed by mixing and stirring high-grade cement, quartz sand, silica fume, building sand, building steel fiber or other non-metallic short fibers (such as polymethylene, polyethylene and the like) by a certain method, does not contain coarse aggregate, and has the compressive strength of more than 150 MPa; the reinforcing sheet 3 can be generally adhered to the upper and lower surfaces of the connection area after the first UHPC shell 1 and the second UHPC shell 2 are spliced by a wet adhesion method, so that the connection strength can be further enhanced, and the integrity of the template can be improved. The epoxy resin adopted as the binder has good bonding strength and chemical resistance, and can help to improve the weather resistance of the permanent template; or the cement paste has certain strength after being solidified, has viscosity, is low in production cost and can be applied in a large scale; the adoption of any one binder does not affect the achievement of the purpose of the invention.
In the present embodiment, the reinforcing sheet 3 is an FRP sheet made of one of carbon fiber, glass fiber, aramid fiber, or plastic fiber. The fiber direction of the FRP sheet can be arranged along the circumferential direction of the shell, the structural strength is enhanced, the FRP sheet made of one or more of carbon fiber, glass fiber, aramid fiber or plastic fiber and the like has excellent performances of light weight, high strength, corrosion resistance, fatigue resistance, low creep deformation and the like, the environmental weather resistance of a permanent template can be ensured, and the FRP sheet can be suitable for more special engineering occasions such as ocean engineering or other corrosive environments and the like.
In this embodiment, a plurality of axially disposed FRP frame studs 4 are respectively disposed inside the first UHPC housing 1 and the second UHPC housing 2, and the FRP frame studs 4 can be used to reinforce the strength of the UHPC housing, so that the UHPC housing is more stable and firm when lateral constraint is applied to a cylindrical member. The FRP frame stud 4 is made of one of carbon fiber, glass fiber, aramid fiber or plastic fiber. The FRP frame vertical rib 4 made of one or a plurality of carbon fiber, glass fiber, aramid fiber or plastic fiber has the excellent performances of light weight, high strength, corrosion resistance, fatigue resistance, low creep deformation and the like.
In this embodiment, the first grouting sleeve 101 and the second grouting sleeve 201 are both made of stainless steel material, and the inner side walls are both threaded. The surface of the inner side of the grouting sleeve is subjected to thread treatment, so that the contact area between the binder and the FRP stirrup can be increased, the binding property is increased, and the binding firmness is improved.
In this embodiment, first hoop FRP stirrup 102 and the second hoop FRP stirrup 202's structure is the same, the diameter of stirrup is 4mm, and the length of the reservation end of two FRP stirrups is 10 times of diameter, thus, the intensity of FRP stirrup itself can be guaranteed to the diameter size of FRP stirrup on the one hand, after carrying out the gomphosis and fixing, guarantee holistic concatenation intensity, the length of the reservation end of on the other hand FRP stirrup is enough long, can guarantee that the reservation end of embedding UHPC casing has sufficient firm power to support holistic tensile behind the gomphosis, anti ability of rolling over.
In this embodiment, the FRP stirrup is made of one or a mixture of carbon fiber, glass fiber, aramid fiber, or plastic fiber, and has excellent properties such as light weight, high strength, corrosion resistance, fatigue resistance, and low creep deformation.
According to the invention, the FRP stirrups and the grouting sleeves which can be mutually embedded are filled with the binder through the grouting holes, so that the first UHPC shell 1 and the second UHPC shell 2 are combined and fixed into an FRP-UHPC shell prefabricated part combined by the UHPC and the FRP stirrups; the material used by the invention has high strength, the components have better integrity after connection, the mechanical property is excellent, and the material has good durability and corrosion resistance, can be suitable for more special engineering occasions such as ocean engineering or other corrosive environments, has wider applicability and has good application prospect.
On one hand, the invention protects the structural member to work in a corrosive environment by utilizing the excellent corrosion resistance of the FRP material and the anti-permeability of the UHPC material; on the other hand, when the damaged cylindrical member is reinforced, the gap between the shell and the original member needs to be grouted or filled with epoxy resin, and the UHPC shell exerts lateral constraint on the compressed cylindrical member, so that the strength and ductility of the damaged member are improved.
The FRP-UHPC shell reinforced prefabricated member disclosed by the invention does not need to be additionally provided with a template for pouring concrete in the preparation process, does not need secondary pouring connection, can be directly applied to the working conditions of various projects after splicing and reinforcing are finished, is convenient to install, greatly reduces the construction labor, saves the preparation cost, and can well meet the requirements for realizing standardized construction and offshore construction operation.
Example 2:
the present embodiment is similar to embodiment 1, except that the diameters of the first hoop FRP stirrup 102 and the second hoop FRP stirrup 202 in the present embodiment are both 3mm, the lengths of the reserved ends of the first hoop FRP stirrup 102 and the second hoop FRP stirrup 202 are 15 times of the diameters, and the structures and the operating principles of other parts of the present embodiment are the same as those of embodiment 1, and will not be described again.
Example 3:
the present embodiment is similar to embodiment 1, except that the diameters of the first hoop FRP stirrup 102 and the second hoop FRP stirrup 202 in the present embodiment are both 5mm, and the lengths of the reserved ends of the first hoop FRP stirrup 102 and the second hoop FRP stirrup 202 are 20 times of the diameters, and the structures and the operating principles of other parts of the present embodiment are the same as those of embodiment 1, and will not be described again.
Example 4:
the embodiment provides a preparation method of an FRP-UHPC shell reinforcement prefabricated member, which comprises the following steps:
s1: splicing the shell:
inserting a first reserved end 103 penetrating through the end surfaces of two sides of a first UHPC shell 1 into a second grouting sleeve 201 corresponding to a second UHPC shell 2, and inserting a second reserved end 203 penetrating through the end surfaces of two sides of the second UHPC shell 2 into a first grouting sleeve 101 corresponding to the first UHPC shell 1, so as to splice the first UHPC shell 1 and the second UHPC shell 2;
s2: fixing the shell:
injecting an expanding agent into the first grouting hole 104 and the second grouting hole 204, so that the expanding agent is filled in a gap between the first grouting sleeve 101 and the second reserved end 203 and a gap between the second grouting sleeve 201 and the first reserved end 103, and after the expanding agent is dried, fixing the first UHPC shell 1 and the second UHPC shell 2 is completed;
s3: reinforcing the shell:
after the reinforcing sheet 3 is coated with the adhesive, the reinforcing sheet 3 is stuck to the outer surface of the joint where the first UHPC case 1 and the second UHPC case 2 are fitted, and after the adhesive is dried, the first UHPC case 1 and the second UHPC case 2 are reinforced.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An FRP-UHPC shell reinforcement preform, comprising:
the first UHPC shell (1) is semicircular, a plurality of first grouting sleeves (101) are stacked on two sides of the interior of the first UHPC shell (1) in a staggered mode, one end of each first grouting sleeve (101) is flush with the end face of one side of the first UHPC shell (1), the other end of each first grouting sleeve is connected with a first annular FRP (fiber reinforced plastic) hoop (102), the other end of each first annular FRP hoop (102) extends to the end face of the other side of the first UHPC shell (1) and penetrates out to form a first reserved end (103), a first grouting hole (104) is formed in each first grouting sleeve (101), and the inlet of each first grouting hole (104) is arranged on the outer wall of the corresponding first UHPC shell (1);
the second UHPC shell (2) is semicircular, a plurality of second grouting sleeves (201) are stacked on two sides of the inside of the second UHPC shell in a staggered mode, one ends of the second grouting sleeves (201) are flush with the end face of one side of the second UHPC shell (2), the other ends of the second grouting sleeves are connected with second annular FRP stirrups (202), the other ends of the second annular FRP stirrups (202) extend to the end face of the other side of the second UHPC shell (2) and penetrate out to form second reserved ends (203), second grouting holes (204) are formed in the second grouting sleeves (201), and inlets of the second grouting holes (204) are formed in the outer wall of the second UHPC shell (2);
the first UHPC shell (1) and the second UHPC shell (2) are arranged in a height-equal symmetry mode, when the assembly is carried out, a first reserved end (103) of the first UHPC shell (1) with the same level height is inserted into the second grouting sleeve (201) of the second UHPC shell (2), a second reserved end (203) of the second UHPC shell (2) is inserted into the first grouting sleeve (101) of the first UHPC shell (1), and an expanding agent is injected from a grouting hole to fix the first UHPC shell (1) and the second UHPC shell (2) to form a hollow cylindrical reinforcement prefabricated member through assembly.
2. The FRP-UHPC shell reinforcement preform as claimed in claim 1, characterized in that the splice of the first UHPC shell (1) and the second UHPC shell (2) is adhesively covered with a reinforcement sheet (3).
3. The FRP-UHPC shell reinforcement preform as claimed in claim 2, wherein the reinforcement sheet (3) is bonded by an adhesive, the adhesive being one of epoxy resin and expanded cement paste.
4. The FRP-UHPC shell reinforcement preform as claimed in claim 2, characterized in that the reinforcement sheet (3) is an FRP sheet made of one of carbon, glass, aramid or plastic fibers.
5. The FRP-UHPC shell reinforcement preform as claimed in claim 1, wherein the first UHPC shell (1) and the second UHPC shell (2) are respectively provided with a plurality of FRP frame studs (4) which are axially arranged inside.
6. The FRP-UHPC shell reinforcement preform as claimed in claim 5, characterized in that the FRP frame studs (4) are made of one of carbon fiber, glass fiber, aramid fiber or plastic fiber.
7. The FRP-UHPC shell reinforcement preform as claimed in claim 1, wherein the first grouting sleeve (101) and the second grouting sleeve (201) are made of stainless steel material, and the inner side walls are threaded.
8. The FRP-UHPC shell reinforcement preform of claim 1, wherein the length of the first reserved end (103) of the first hoop FRP hoop (102) is 10-20 times the diameter of the first hoop FRP hoop (102); the length of the second reserved end (203) of the second hoop FRP hoop reinforcement (202) is 10-20 times of the diameter of the second hoop FRP hoop reinforcement (203).
9. The FRP-UHPC shell reinforcement preform of claim 1, wherein the first hoop FRP hoop reinforcement (102) and the second hoop FRP hoop reinforcement (202) are each made of one of carbon fiber, glass fiber, aramid fiber, or plastic fiber.
10. A method for preparing a reinforced preform of FRP-UHPC shell as claimed in claim 3, comprising the steps of:
s1: splicing the shell:
inserting a first reserved end (103) penetrating through end faces on two sides of a first UHPC shell (1) into a second grouting sleeve (201) corresponding to a second UHPC shell (2), and inserting a second reserved end (203) penetrating through end faces on two sides of the second UHPC shell (2) into a first grouting sleeve (101) corresponding to the first UHPC shell (1) to complete splicing of the first UHPC shell (1) and the second UHPC shell (2);
s2: fixing the shell:
filling an expanding agent into the first grouting hole (104) and the second grouting hole (204), so that the expanding agent is filled in a gap between the first grouting sleeve (101) and the second reserved end (203) and a gap between the second grouting sleeve (201) and the first reserved end (103), and after the expanding agent is dried, fixing the first UHPC shell (1) and the second UHPC shell (2) is completed;
s3: reinforcing the shell:
and (3) coating an adhesive on the reinforcing sheet (3), then adhering the reinforcing sheet (3) to the outer surface of the joint of the first UHPC shell (1) and the second UHPC shell (2) after the first UHPC shell and the second UHPC shell are embedded, and drying the adhesive to finish the reinforcement of the first UHPC shell (1) and the second UHPC shell (2).
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| CN202210662576.9A CN114875812A (en) | 2022-06-13 | 2022-06-13 | FRP-UHPC shell reinforced prefabricated member and preparation method thereof |
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| CN202210662576.9A CN114875812A (en) | 2022-06-13 | 2022-06-13 | FRP-UHPC shell reinforced prefabricated member and preparation method thereof |
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| US20210115634A1 (en) * | 2016-07-28 | 2021-04-22 | Carboshield, Inc. | Apparatus and method for reinforcing a partially submerged structural element |
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Application publication date: 20220809 |