Prefabricated assembly type FRP pipe concrete column-foundation sleeve joint and construction method

Abstract

The invention discloses a prefabricated FRP pipe concrete column-foundation sleeve joint and a construction method, and belongs to the technical field of structural engineering.The joint comprises a prefabricated FRP pipe concrete column and a reinforced concrete foundation, and the prefabricated FRP pipe concrete column and the reinforced concrete foundation are combined and linked through a screw module, a steel sleeve module and high-toughness epoxy resin grouting which are pre-buried in the foundation. The prefabricated FRP pipe concrete column is composed of an FRP pipe and concrete, and the reinforced concrete foundation is composed of straight-through stress ribs, long reinforcing ribs, short reinforcing ribs and concrete. The FRP pipe is chemically bonded with the steel sleeve through high-toughness epoxy resin, and the steel sleeve is mechanically connected with the screw module pre-buried in a foundation through the nut, so that the drawing force of a node area can be effectively resisted; the steel sleeve and the screw rod module jointly form a horizontal resistance device, so that the compression damage of the bearing platform concrete can be effectively reduced. The fabricated column-foundation sleeve joint is easy to standardize in structural form, convenient to install and construct, reliable in connection, low-carbon, durable and high in anti-seismic safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural engineering, and in particular to a prefabricated FRP pipe concrete column-foundation sleeve joint and construction method. BACKGROUND

[0002] With the acceleration of urbanization and the promotion of green building concept, prefabricated structures are widely used in civil engineering due to their efficient construction, low environmental pollution, and controllable quality. However, traditional prefabricated node connection technology still has many problems, especially in complex environments (such as marine, chemical area, etc. Corrosive environment) durability and seismic performance is insufficient. For example, the existing sleeve connection technology mostly uses ordinary steel and cement-based grouting material, which has the following defects: poor corrosion resistance: steel sleeve and steel bar are easy to rust in humid or chloride environment, resulting in node strength degradation; insufficient connection reliability: single mechanical or chemical connection method is easy to cause interface peeling due to grouting not dense or material aging; low environmental protection: traditional concrete production has high energy consumption and large carbon emissions, natural aggregate mining destroys the ecology and has high cost; complex construction: node structure has high precision requirements, on-site adjustment is difficult, and construction efficiency is affected.

[0003] The existing patent CN107869150A proposes a socket joint that relies on large socket depth, which can improve seismic performance, but the foundation size is large and material waste is serious. Another type of sleeve connection technology, such as patent CN110284516A, achieves connection through pre-buried bolts and grouting, but the on-site grouting process is complex and the quality is difficult to guarantee, and traditional cement-based grouting material has high shrinkage rate and insufficient toughness, which is easy to crack under dynamic load. In addition, the interfacial bonding strength between FRP pipe and traditional cement-based material is low, and slip failure is easy to occur, which requires complex interface treatment process.

[0004] In view of the above problems, a new prefabricated node is needed, which has high durability, high connection strength, convenient construction and green environmental protection. SUMMARY

[0005] The purpose of the present application is to provide a prefabricated FRP pipe concrete column-foundation sleeve joint and construction method, which has good connection reliability, excellent seismic performance, simple construction process, and low carbon environmental protection, etc. It can meet the needs of structure and bridge engineering construction in complex environment (such as marine, chemical area, etc. Corrosive environment), to solve the problems of insufficient seismic performance, poor durability, complex construction process, etc. of the existing prefabricated FRP pipe column-foundation node.

[0006] The application provides a prefabricated FRP pipe concrete column-base sleeve joint, which is composed of a prefabricated FRP pipe concrete column, a steel sleeve module, a screw module and a reinforced concrete base; the prefabricated FRP pipe concrete column comprises an FRP pipe and concrete; the steel sleeve module comprises a steel sleeve, a stiffening rib and a reserved hole steel bottom plate; the screw module comprises a screw and a steel bottom plate; the reinforced concrete base comprises concrete, straight-through stress-receiving bars, long reinforcing bars and short reinforcing bars; the screw module is embedded in the reinforced concrete base, the steel sleeve module is chemically bonded with the reinforced concrete base through steel adhesive, and is mechanically connected with the embedded screw module through a nut; the prefabricated FRP pipe concrete column is inserted into the steel sleeve module and is chemically bonded with the steel sleeve module through a steel adhesive pad layer and a high-toughness epoxy resin grouting layer.

[0007] Preferably, the interface treatment between the FRP pipe and the core concrete includes no treatment, sand wrapping treatment or notch treatment.

[0008] Preferably, the FRP pipe is prepared by a fiber filament automatic winding technology, the cross-sectional shape includes a circle, a square, a rounded square, a rectangle, a rounded rectangle or an ellipse, the fiber type is any one or more of carbon fiber, glass fiber and basalt fiber, the fiber winding angle is one or more between 0-90°, the matrix type is any one or more of epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polypropylene, polyurethane, polyether ether ketone and the like, and the thickness is determined according to the engineering requirement, but is not less than 2 mm.

[0009] Preferably, the concrete preferably adopts geopolymer concrete, but can be replaced by ordinary concrete, UHPC, ECC and the like according to the engineering environment and cost requirement, the aggregate uses one or more of ordinary natural aggregate, recycled aggregate or coral aggregate according to the actual requirement, the mix proportion design is performed according to the concrete mix proportion design method in the current relevant specification, and the concrete cube compressive strength is not less than 30 MPa.

[0010] Preferably, the steel material type used by the steel sleeve module and the screw module selects ordinary steel or stainless steel according to the actual engineering environment condition, and welding connection is adopted between the components.

[0011] The geometric center of the steel sleeve coincides with the geometric center of the reserved hole steel bottom plate, the difference between the inner diameter of the steel sleeve and the outer diameter of the FRP pipe is 5-50 mm, the height is 1-2 times the outer diameter of the FRP pipe, and the thickness is determined according to the actual engineering requirement, but is not less than the thickness of the FRP pipe used in the same joint.

[0012] The stiffening rib is located on the diagonal line of the reserved hole steel bottom plate, and the shape is a right trapezoid, a rectangle or a triangle, the height is consistent with the height of the steel sleeve, and the thickness is not less than the thickness of the steel sleeve used in the same joint.

[0013] Preferably, the reserved hole steel base plate is square, rectangular or circular or any other shape required by engineering, with a thickness not less than 15 mm, a reserved hole diameter size determined according to the screw rod diameter, and a minimum distance from the plate edge not less than 25 mm.

[0014] The screw rod diameter is not less than 18 mm, and the length is not less than 100 mm higher than the surface of the reinforced concrete foundation.

[0015] The steel base plate shape and size are consistent with the reserved hole steel base plate shape, and the bottom concrete cover thickness meets the current specification requirements.

[0016] Preferably, the straight force bearing bar, long reinforcing bar and short reinforcing bar are selected from any one or more of ordinary steel bar, FRP bar and FRP-steel composite bar according to the actual environmental conditions of the project, the bars are connected by welding or steel wire, binding tape or the like, the bar diameter and size are determined according to the actual engineering requirements, and the concrete cover thickness meets the current specification requirements.

[0017] Preferably, the long reinforcing bar is arranged in at least 8 longitudinal and horizontal directions, and the length is 2-4 times the width of the reserved hole steel base plate, of which 12 long reinforcing bars are respectively located on both sides of the row of screw rods with a distance of 2-3 times the screw rod diameter, and the remaining 4 long reinforcing bars are located outside the edges of the reserved hole steel base plate with a distance of 2-3 times the screw rod diameter.

[0018] The short reinforcing bar is arranged in 4 longitudinal and horizontal directions, and the horizontal part is at least 10 times the diameter of the short reinforcing bar longer than the edge of the reserved hole steel base plate, and is symmetrically arranged on both sides of the edge of the reserved hole steel base plate with a horizontal distance of 2-3 times the screw rod diameter.

[0019] Preferably, the high-toughness epoxy resin has a compressive strength 2-4 grades higher than that of the concrete used in the prefabricated FRP pipe concrete column, an impact strength not less than 15 kJ m 2 , an elongation at break not less than 5%, a volume shrinkage not more than 1%, and a curing time of 0.5-4h.

[0020] The construction method of the prefabricated FRP pipe concrete column-base sleeve joint described above comprises the following steps: S1, the FRP pipe wall prepared by automatic winding of fiber filaments is pretreated in the factory, including no treatment, sand wrapping treatment or notch treatment, the bottom formwork is installed, the concrete is poured, vibrated and compacted, and cured for more than 7 days under suitable conditions, the formwork is removed, the end face is polished, and the prefabricated FRP pipe concrete column is completed; S2, processing the steel sleeve module in the factory, cutting the seamless steel pipe to obtain the steel sleeve according to the design size, cutting the steel plate to obtain the stiffening rib and the reserved hole steel base plate, arranging the steel sleeve at the center of the reserved hole steel base plate, adjusting and welding vertically to the reserved hole steel base plate, welding the stiffening rib between the outer wall of the steel sleeve and the upper surface of the reserved hole steel base plate along the diagonal line of the reserved hole steel base plate, and completing the manufacturing of the steel sleeve module; S3, processing the screw module in the factory, cutting the long screw to obtain the rated size screw according to the design size, cutting the steel plate to obtain the steel base plate, and vertically welding the screw to the design position of the steel base plate to complete the manufacturing of the screw module; S4, uniformly laying a 5-20 mm thick layer of steel bonding glue pad on the bottom surface of the steel sleeve in the factory, inserting the prefabricated FRP pipe concrete column into the steel sleeve, adjusting the prefabricated FRP pipe concrete column to be located at the center position of the steel sleeve and perpendicular to the reserved hole steel base plate, and curing for more than 3d under suitable conditions to complete the placement of the prefabricated FRP pipe concrete column; S5, preparing high-toughness epoxy resin in the factory, and pouring the high-toughness epoxy resin into the gap between the prefabricated FRP pipe concrete column and the steel sleeve through a funnel until the high-toughness epoxy resin is slightly higher than the upper end surface of the steel sleeve under the surface tension, and curing for more than 3d under suitable conditions, so that the prefabricated FRP pipe concrete column and the steel sleeve module are connected to form a whole; S6, transporting the screw module to the construction site, placing the screw module according to the design drawing, binding the straight through stress reinforcement, long reinforcement and short reinforcement of the reinforced concrete foundation, pouring concrete, and curing for more than 14d under suitable conditions to complete the manufacturing of the embedded screw module reinforced concrete foundation; S7, transporting the prefabricated FRP pipe concrete column with the steel sleeve module to the construction site, polishing the concrete in the embedded screw module area, cleaning the surface residues and dust, ensuring the surface to be flat, clean and horizontal, uniformly applying 5mm thick steel bonding glue, and then hoisting and embedding the prefabricated FRP pipe concrete column with the steel sleeve module into the screw module, applying the same size design torque to the nut using a torque wrench, and curing for more than 3d under suitable conditions to complete the assembly of the prefabricated assembly type FRP pipe concrete column-base sleeve joint.

[0021] Therefore, the prefabricated assembly type FRP pipe concrete column-base sleeve joint and the construction method have the following beneficial effects: (1) The present application chemically bonds the prefabricated FRP pipe concrete column and the steel sleeve module together through the steel bonding glue sitting layer and the high toughness epoxy resin grouting layer, simultaneously chemically bonds the steel sleeve module and the reinforced concrete foundation through the steel bonding glue, and mechanically connects the steel sleeve module and the embedded screw rod module through the nut, so that the connection reliability of the joint is greatly improved, and the cooperative work between the prefabricated components is ensured. Under the action of the earthquake, the joint can effectively resist the shear force, the pulling force and the bending moment, prevents the relative slip and disengagement between the components, and improves the overall stability and the seismic performance of the structure. Meanwhile, the high strength and toughness of the fiber filament wound FRP pipe and the good adhesion of the high toughness epoxy resin enable the joint to maintain good bearing capacity under repeated earthquake action, and the collapse of the structure is avoided.

[0022] (2) The joint structure adopts the prefabricated assembly construction method, the prefabricated FRP pipe concrete column, the steel sleeve module and the screw rod module are all processed and manufactured in the factory, so that the quality is easy to guarantee, the assembly work of the joint can be completed through simple operations such as hoisting and tightening the nut on the site, the construction period is greatly shortened, the site wet operation is reduced, the influence of the construction on the environment is reduced, and the construction efficiency and economic benefits are improved.

[0023] (3) The FRP pipe of the prefabricated FRP pipe concrete column is prepared by the fiber filament automatic winding technology, the production process is pollution-free, and the FRP pipe can be recycled; the geopolymer concrete uses industrial waste residue as the cementitious material, reduces the use of cement, reduces the carbon dioxide emission, and has good environmental friendliness. In addition, the prefabricated assembly construction method reduces the noise, dust and other pollution in the site construction process, realizes the reduction of construction waste, and meets the requirements of sustainable development.

[0024] (4) The prefabricated assembly type FRP pipe concrete column-foundation sleeve joint of the present application is suitable for structures and bridge engineering under various complex environments (such as marine, chemical area and other corrosive environments), different engineering can select appropriate FRP pipe cross-sectional shape, size, concrete type and strength grade, and different steel type and connecting component size according to specific requirements, and has strong adaptability and flexibility.

[0025] The technical solutions of the present application will be further described in detail through the drawings and examples. DRAWINGS

[0026] Figure 1 is a schematic view of the facade structure of the present application; Figure 2 is an A-A cross-sectional schematic view of the present application; Figure 1 Figure 3 is a B-B cross-sectional schematic view of the present application; Figure 1 ​​Figure 4 Figure (a) is a schematic diagram of a steel base plate, (b) is a schematic diagram of a steel sleeve, (c) is a schematic diagram of a stiffening rib, and (d) is a schematic diagram of a steel sleeve module as a whole; Figure 5 Figure (a) is a schematic diagram of a steel base plate, (b) is a schematic diagram of a screw rod, and (c) is a schematic diagram of a screw rod module as a whole; Figure 6 Figure (a) is a schematic diagram of core concrete, (b) is a schematic diagram of a long filament winding formed FRP pipe, and (c) is a schematic diagram of a prefabricated FRP pipe concrete column as a whole; Figure 7 Figure (a) is a schematic diagram of a pre-embedded screw rod module, (b) is a schematic diagram of bottom layer straight-through stress bearing bar laying, (c) is a schematic diagram of short reinforcing bar laying, (d) is a schematic diagram of long reinforcing bar laying, (e) is a schematic diagram of top layer straight-through stress bearing bar laying, and (f) is a schematic diagram of concrete pouring. DETAILED DESCRIPTION

[0027] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Multiple" generally includes at least two.

[0029] It should also be noted that the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the goods or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or include elements inherent to such goods or devices. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the goods or devices including the element.

[0030] Embodiment 1 As shown in the accompanying Figures 1-3As shown in the figure, the prefabricated FRP pipe concrete column-base sleeve joint of the embodiment is composed of a prefabricated FRP pipe concrete column 1 and a reinforced concrete foundation 4, the prefabricated FRP pipe concrete column 1 is inserted into a steel sleeve module 2, high-toughness epoxy resin is poured between the prefabricated FRP pipe concrete column 1 and the steel sleeve 10, and a screw module 3 is embedded in the reinforced concrete foundation 4, and the steel sleeve module 2 and the screw module 3 are connected through bolts.

[0031] As shown in the figure, Figure 4 the steel sleeve module 2 includes a steel sleeve 10, a stiffening rib 11 and a reserved hole steel bottom plate 12, and the components are connected by welding, which is prefabricated in the factory in advance. As shown in the figure, Figure 5 the screw module 3 includes a screw 13 and a steel bottom plate 14, and the components are also connected by welding, which is prefabricated in the factory in advance. As shown in the figure, Figure 6 the FRP pipe concrete column 1 includes core concrete 9 and filament winding FRP pipe 8, and the mixed concrete is poured into the bottom-sealed FRP pipe in the factory during production, and then cured after vibration and compaction. As shown in the figure, Figure 7 the reinforced concrete foundation 4 includes straight-through stress-receiving bars 15, long reinforcing bars 16, short reinforcing bars 17 and concrete 9, and the reinforced concrete foundation 4 is cast in situ on site, the screw module is placed in the appropriate position before laying the reinforcing bars, then the straight-through stress-receiving bars and the reinforcing bars are laid, and finally the concrete is poured.

[0032] In the embodiment, the specific parameters of each component are as follows: the fiber type of the circular FRP pipe is glass fiber, the fiber winding angle is 60°, the matrix type is epoxy resin, the pipe wall thickness is 4 mm, and the outer diameter is 200 mm; the concrete type is geopolymer concrete, and the designed compressive strength is 40 MPa; the inner diameter of the steel sleeve is 220 mm, the height is 200 mm, and the thickness is 6 mm; the height of the right-angled trapezoidal stiffening rib is 200 mm, and the thickness is 6 mm; the thickness of the square reserved hole steel bottom plate is 15 mm, the diameter of the reserved hole is 22 mm, and the minimum distance between the hole and the edge of the plate is 25 mm; the diameter of the screw is 20 mm, and the length is 420 mm; the thickness of the reinforced concrete foundation is 300 mm, the thickness of the concrete protective layer is 25 mm, the straight-through stress-receiving bars and the reinforcing bars are made of FRP-steel composite bars, and the diameters are both 12 mm; the designed compressive strength of the high-toughness epoxy resin is 60 MPa, the impact resistance is not less than 15 kJ / m2, the elongation at break is not less than 5%, the volume shrinkage is not more than 1%, and the curing time is 2h. m 2

[0033] Example 2 ​In this embodiment, a 10 mm layer of steel bonding glue bedding layer 5 is arranged between the bottom surface of the FRP pipe concrete column 1 and the bottom surface of the steel sleeve module 2, and a 5 mm layer of steel bonding glue bedding layer 5 is also arranged between the reserved hole steel bottom plate 12 of the steel sleeve module 2 and the top surface of the reinforced concrete foundation 4. The other structures and connection methods are the same as those in Embodiment 1.

[0034] The specific construction method of the prefabricated FRP pipe concrete column-foundation sleeve joint in Embodiment 2 includes the following steps: S1, in the factory, the inner wall of the FRP pipe prepared by automatic winding of fiber filaments is pretreated, including no treatment, sand wrapping treatment or notch treatment, the bottom template is installed, the polymer concrete is poured, vibrated and compacted, steam curing is performed for more than 7 days, the template is removed, the end face is polished, and the preparation of the prefabricated FRP pipe concrete column 1 is completed; S2, in the factory, the steel sleeve module 2 is processed, a seamless steel pipe is cut to obtain a steel sleeve 10, a steel plate is cut to obtain a reinforcing rib 11 and a reserved hole steel bottom plate 12, the steel sleeve 10 is arranged at the center of the reserved hole steel bottom plate 12, adjusted to be perpendicular to the reserved hole steel bottom plate 12 and welded, and the reinforcing rib 11 is welded between the outer wall of the steel sleeve 10 and the upper surface of the reserved hole steel bottom plate 12 along the diagonal line of the reserved hole steel bottom plate 12, and the preparation of the steel sleeve module 2 is completed; S3, in the factory, a screw module 3 is processed, a long screw is cut to obtain a rated size screw 13, a steel plate is cut to obtain a steel bottom plate 14, and the screw 13 is vertically welded to the steel bottom plate 14 at the designed position, and the preparation of the screw module 3 is completed; S4, in the factory, a layer of 10 mm steel bonding glue 5 bedding layer is uniformly laid on the bottom surface of the steel sleeve 10, the prefabricated FRP pipe concrete column 1 is inserted into the steel sleeve 10, the prefabricated FRP pipe concrete column 1 is adjusted to be located at the center position of the steel sleeve 10 and perpendicular to the reserved hole steel bottom plate 12, and natural curing is performed for more than 3 days, and the placement of the prefabricated FRP pipe concrete column 1 is completed; S5, in the factory, high-toughness epoxy resin is prepared and poured into the gap between the prefabricated FRP pipe concrete column 1 and the steel sleeve 10 through a funnel until the high-toughness epoxy resin slightly exceeds the upper end surface of the steel sleeve 10 under the surface tension, and curing is performed for more than 3 days under suitable conditions, so that the prefabricated FRP pipe concrete column 1 and the steel sleeve module 2 are connected to form a whole; S6, the screw module 3 is transported to the construction site, the screw module 3 is placed according to the design drawing, the straight-through stress-reinforcing rib 15, the long reinforcing rib 16 and the short reinforcing rib 17 of the reinforced concrete foundation 4 are bound, the polymer concrete is poured, and film curing is performed for more than 14 days, and the preparation of the embedded screw module 3 reinforced concrete foundation 4 is completed; S7, transport the prefabricated FRP pipe concrete column 1 of the steel sleeve module 2 to the construction site, polish the concrete in the embedded screw module 3 area, clean the surface residues and floating dust, ensure the surface is flat, clean and level, evenly apply 5 mm thick steel adhesive after the prefabricated FRP pipe concrete column 1 of the steel sleeve module 2 is hoisted and embedded into the screw module 3, the same size design torque is applied to the nut 13 using a torque wrench, and the natural curing is more than 3d, the assembly work of the prefabricated assembly type FRP pipe concrete column-base sleeve joint is completed.

[0035] Therefore, the present application adopts the above-mentioned prefabricated assembly type FRP pipe concrete column-base sleeve joint and method, which chemically bonds the prefabricated FRP pipe concrete column and the steel sleeve module through the steel adhesive bedding layer and the high-toughness epoxy resin grouting layer, simultaneously chemically bonds the steel sleeve module and the reinforced concrete foundation through the steel adhesive, and mechanically connects the steel sleeve module and the embedded screw module through the nut, which greatly enhances the connection reliability of the joint and ensures the cooperative work between the prefabricated components. The FRP material is light in weight, high in strength, corrosion-resistant, and can significantly improve the service life of the component; the geopolymer is low-carbon, fast-hardening, corrosion-resistant, and good in impermeability, which can reduce the site wet work when combined with the FRP prefabricated component. The high-toughness epoxy resin forms a flexible transition layer through chemical bonding, which relieves the interface stress concentration; the bolt connection process realizes modular assembly, which significantly improves the construction convenience. The double connection mechanism of chemical bonding and mechanical anchoring can break through the limitations of single connection mode and provide a reliable solution for assembly type structures in complex environments. Under the action of earthquake, the joint can effectively resist shear force, pulling force and bending moment, prevent the relative slip and disengagement between components, and improve the overall stability and seismic performance of the structure. At the same time, the high strength and toughness of the fiber filament wound FRP pipe and the good adhesion of the high-toughness epoxy resin make the joint still maintain good bearing capacity under repeated seismic action, avoiding the collapse and damage of the structure.

[0036] The node structure adopts a prefabricated assembly construction method, the prefabricated FRP pipe concrete column, the steel sleeve module and the screw module are all processed and manufactured in the factory, the quality is easy to guarantee, the on-site construction mainly completes the assembly work of the node through simple operations such as hoisting and tightening nuts, the construction period is greatly shortened, the on-site wet operation is reduced, the influence of construction on the environment is reduced, and the construction efficiency and economic benefits are improved. The FRP pipe used in the prefabricated FRP pipe concrete column is prepared by the fiber filament automatic winding technology, the production process is pollution-free, and the FRP pipe can be recycled; the geopolymer concrete utilizes industrial waste residue as a cementing material, reduces the use of cement, reduces carbon dioxide emission, and has good environmental friendliness. In addition, the prefabricated assembly construction method reduces the noise, dust and other pollution in the on-site construction process, realizes the reduction of construction waste, and meets the requirements of sustainable development. The prefabricated assembly FRP pipe concrete column-base sleeve node is suitable for structures and bridge engineering under various complex environments (such as marine, chemical area and other corrosive environments), different engineering can select appropriate FRP pipe cross-sectional shape, size, concrete type and strength grade, and different steel types and connecting member sizes according to specific requirements, and has strong adaptability and flexibility.

[0037] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: it can still modify or equivalently replace the technical solutions of the present application, and these modifications or equivalent replacements also cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A prefabricated FRP pipe concrete column-foundation sleeve joint, comprising a prefabricated FRP pipe concrete column (1), a steel sleeve module (2), a screw module (3), and a reinforced concrete foundation (4), characterized in that, The screw module (3) is embedded in the reinforced concrete foundation (4), and the steel sleeve module (2) is chemically bonded to the reinforced concrete foundation (4) through steel adhesive, and mechanically connected to the embedded screw module (3) through a nut (6); the precast FRP pipe concrete column (1) is inserted into the steel sleeve module (2), and is chemically bonded to the steel sleeve module (2) through a steel adhesive grouting layer (5) and a high-toughness epoxy resin grouting layer (7); The precast FRP pipe concrete column (1) includes an FRP pipe (8) and concrete (9). The interface treatment between the two includes no treatment, sand coating treatment or scoring treatment. The FRP pipe (8) is prepared by automatic fiber filament winding technology. The cross-sectional shape includes circular, square, rounded square, rectangular, rounded rectangular or elliptical. The fiber type is any one or more of carbon fiber, glass fiber, basalt fiber. The fiber winding angle is one or more between 0-90°. The matrix type is any one or more of epoxy resin, unsaturated polyester resin, vinyl ester resin, phenolic resin, polypropylene, polyurethane, polyetheretherketone, etc. The thickness is determined according to the engineering requirements, but not less than 2 mm.

2. The prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 1, characterized in that, The type of concrete (9) includes geopolymer concrete, ordinary concrete, ultra-high performance concrete, or engineering cement composite material. The aggregate is one or more of ordinary natural aggregate, recycled aggregate or coral aggregate according to actual needs. The concrete cube compressive strength is not less than 30 MPa.

3. The prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 1, characterized in that, The steel sleeve module (2) includes a steel sleeve (10), stiffening ribs (11) and a pre-drilled steel base plate (12). The type of steel is selected according to the environmental conditions of the actual project, and ordinary steel or stainless steel is selected. The components are connected by welding. The geometric center of the steel sleeve (10) coincides with the geometric center of the pre-drilled steel base plate (12), the difference between the inner diameter and the outer diameter of the FRP pipe (8) is 5-50 mm, the height is 1-2 times the outer diameter of the FRP pipe (8), and the thickness is not less than the thickness of the FRP pipe used in the same node. The stiffening rib (11) is located on the diagonal of the pre-drilled hole steel base plate (12), with the same height as the steel sleeve (10) and a thickness not less than the thickness of the steel sleeve used at the same node; The thickness of the steel base plate (12) with the reserved hole is not less than 15 mm, and the minimum distance between the reserved hole and the edge of the plate is not less than 25 mm.

4. The prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 1, characterized in that, The screw module (3) includes a screw (13) and a steel base plate (14). The type of steel is selected according to the environmental conditions of the actual project, and ordinary steel or stainless steel is selected. The components are connected by welding. The screw (13) has a diameter of not less than 18 mm and a length that extends at least 100 mm above the upper surface of the reinforced concrete foundation (4); The shape and size of the steel base plate (14) are consistent with the shape of the pre-drilled hole steel base plate (12).

5. A prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 1, characterized in that, The reinforced concrete foundation (4) includes concrete (8), straight reinforcing bars (15), long reinforcing bars (16) and short reinforcing bars (17); the straight reinforcing bars (15), long reinforcing bars (16) and short reinforcing bars (17) are selected from any one or more of ordinary steel bars, FRP bars, and FRP-steel composite bars according to the actual environmental conditions of the project, and the reinforcing bars are connected by welding or binding.

6. A prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 5, characterized in that, The long reinforcing ribs (16) are arranged in at least 8 longitudinally and 8 laterally, with a length of 2-4 times the width of the pre-drilled hole steel base plate (11). Among them, 12 long reinforcing ribs (16) are located on both sides of the screw (13) at a distance of 2-3 times the diameter of the screw (13), and the remaining 4 long reinforcing ribs (16) are located on the outer edge of the pre-drilled hole steel base plate (12) at a distance of 2-3 times the diameter of the screw (13).

7. A prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 5, characterized in that, The short reinforcing ribs (17) are arranged in four longitudinal and four transverse directions. The length of the horizontal part exceeds the edge of the pre-drilled hole steel base plate (12) by at least 10 times its own diameter. They are symmetrically arranged on the left and right sides of the edge of the pre-drilled hole steel base plate (12). The horizontal distance between them and the edge of the pre-drilled hole steel base plate (12) is 2-3 times the diameter of the screw (13).

8. A prefabricated assembled FRP pipe concrete column-foundation sleeve joint according to claim 1, characterized in that, The high-toughness epoxy resin grouting layer (7) has a compressive strength that is 2-4 grades higher than that of the concrete (8) used in the precast FRP pipe concrete column (1), and its impact strength is not less than 15 kJ. m 2 The elongation at break is not less than 5%, the volume shrinkage is not greater than 1%, and the curing time is 0.5-4h.

9. A construction method for a precast assembled FRP pipe concrete column-foundation sleeve joint as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Pre-treatment of the inner wall of the FRP pipe prepared by automatic winding of fiber filaments in the factory, including no treatment, sand wrapping treatment or scoring treatment, installation of bottom template, pouring of concrete, vibration compaction, curing for more than 7 days under suitable conditions, removal of template, grinding of end face, and completion of the production of precast FRP pipe concrete column (1). S2. Process the steel sleeve module (2) in the factory. Cut the seamless steel pipe according to the design size to obtain the steel sleeve (10). Cut the steel plate to obtain the stiffening rib (11) and the pre-drilled hole steel base plate (12). Place the steel sleeve (10) at the center of the pre-drilled hole steel base plate (12), adjust it to be perpendicular to the pre-drilled hole steel base plate (12) and weld it. Weld the stiffening rib (11) between the outer wall of the steel sleeve (10) and the upper surface of the pre-drilled hole steel base plate (12) along the diagonal of the pre-drilled hole steel base plate (12) to complete the production of the steel sleeve module (2). S3. Process the screw module (3) in the factory, cut the long screw according to the design size to obtain the rated size screw (13), cut the steel plate to obtain the steel base plate (14), and weld the screw (13) vertically to the steel base plate (14) at the designed position to complete the production of the screw module (3); S4. At the factory, a 5-20 mm layer of steel adhesive grouting layer (5) is evenly laid on the bottom surface of the steel sleeve (10). The precast FRP pipe concrete column (1) is inserted into the steel sleeve (10). The precast FRP pipe concrete column (1) is adjusted so that it is located in the center of the steel sleeve (10) and perpendicular to the pre-drilled hole steel base plate (12). Under suitable conditions, it is cured for more than 3 days to complete the placement of the precast FRP pipe concrete column (1). S5. Prepare high-toughness epoxy resin in the factory and pour it into the gap between the precast FRP pipe concrete column (1) and the steel sleeve (10) using a funnel until the surface tension of the high-toughness epoxy resin grouting layer (7) is slightly higher than the upper end of the steel sleeve (10). Cure it for more than 3 days under suitable conditions so that the precast FRP pipe concrete column (1) and the steel sleeve module (2) are connected into a whole. S6. Transport the screw module (3) to the construction site, fix the screw module (3) according to the design drawings, tie the straight reinforcing bar (15), long reinforcing bar (16) and short reinforcing bar (17) of the reinforced concrete foundation (4), pour concrete, and cure for more than 14 days under suitable conditions to complete the production of the pre-embedded screw module (3) reinforced concrete foundation (4). S7. Transport the precast FRP pipe concrete column (1) with steel sleeve module (2) to the construction site, grind the concrete in the area of ​​the pre-embedded screw module (3), clean the surface residue and dust, and ensure that the surface is flat, clean and level. After uniformly applying 5 mm thick steel adhesive, hoist the precast FRP pipe concrete column (1) with steel sleeve module (2) into the screw module (3), use a torque wrench to apply the same design torque to the nut (13), and cure for more than 3 days under suitable conditions to complete the assembly of the precast assembled FRP pipe concrete column-foundation sleeve node.

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