An assembled PVC-FRP tube steel concrete column and its construction method

Abstract

The present invention discloses an assembled PVC-FRP tube-type steel-concrete column and a construction method thereof, comprising mutually connected PVC-FRP tubes and a first connecting piece and a second connecting piece arranged at both ends of the PVC-FRP tube; and the first flange and the second flange are connected to each other through a first clamping groove in the first connecting piece and a second clamping groove in the second connecting piece; the connection method of the present invention is simple, the force transmission path at the connection is clear and reliable, and the construction is convenient, by arranging a first connecting plate, a first L-shaped bottom plate of the second connecting plate and a second L-shaped bottom plate at the connection to form a first clamping groove and a second clamping groove that are clamped to each other, and fixedly connected with a sleeve and a flange, so that the connection structure is more stable and has a certain recoverability, and can also improve the structural ductility and shear resistance. In addition, the PVC-FRP tube-type steel-concrete column can be prefabricated in advance, and the components can be factory-produced, which effectively shortens the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure engineering, in particular to an assembled PVC-FRP tubular steel concrete column and a construction method thereof. Background Art

[0002] Prefabricated reinforced concrete structures are a key form of building industrialization, offering advantages such as rapid construction, shortened construction periods, improved quality, energy conservation, reduced consumption, and clean production. Simultaneously, with the advent of "intelligent cities" and "resilient cities," both building industrialization and the seismic resistance of engineering structures face higher demands and challenges. This requires that primary load-bearing components be rapidly repairable after damage and possess a sufficient load-bearing capacity. Consequently, the disassembly and restorability of prefabricated reinforced concrete structures has attracted the attention of researchers both domestically and internationally.

[0003] PVC-FRP tube concrete columns are a new type of composite column formed by wrapping FRP at equal intervals around the surface of a PVC tube and pouring concrete inside the tube. These columns fully utilize the material properties of PVC and FRP, significantly enhancing the bearing capacity, ductility, and deformation capacity of the core concrete within the tube. They are suitable for use in engineering structures such as bridges, underground projects, and marine engineering. However, one of the key challenges in applying PVC-FRP tube concrete columns to prefabricated concrete structures is solving the problems of connecting and disassembling the columns.

[0004] In order to solve the above problems, the present invention provides an assembled PVC-FRP tubular steel concrete column and a construction method thereof to solve the problems of weak bearing capacity and deformation recovery ability of previous precast concrete columns. Summary of the Invention

[0005] The purpose of the present invention is to provide an assembled PVC-FRP tube steel concrete column and a construction method thereof, so as to achieve the purpose of improving the bearing capacity and recovery capacity of the steel concrete column.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A prefabricated PVC-FRP tube-type steel-concrete column comprises a PVC-FRP tube connected to each other and a first connecting piece and a second connecting piece arranged at both ends of the PVC-FRP tube, an I-beam of the same length as the PVC-FRP tube is arranged in the PVC-FRP tube, the first connecting piece comprises a first connecting plate respectively arranged vertically on the lower areas of the two flange plates of the I-beam, a first L-shaped bottom plate, a first flange and a first sleeve arranged at the bottom of the I-beam, the first sleeve is sleeved on the outer surface of the PVC-FRP tube, the first flange is sleeved on the outer surface of the PVC-FRP tube and the lower surface of the flange is flush with the bottom surface of the PVC-FRP tube, the first connecting plate passes through the PVC-FRP tube and is connected to the first flange, the bottom of the first sleeve is connected to the first flange, and the first sleeve is sleeved on the outer surface of the PVC-FRP tube. The area between an L-shaped bottom plate and the first connecting plate forms a first clamping groove, and the second connecting piece includes a second L-shaped bottom plate respectively vertically arranged on the upper area of ​​the two flange plates of the I-beam, a second connecting plate arranged on the second L-shaped bottom plate, a second flange and a second sleeve, the second sleeve is sleeved on the outer surface of the PVC-FRP pipe, the second flange is sleeved on the outer surface of the PVC-FRP pipe, the second connecting plate passes through the PVC-FRP pipe and is connected to the second flange, the top of the second sleeve is connected to the second flange, and the area between the second L-shaped bottom plate and the second connecting plate forms a second clamping groove, adjacent PVC-FRP pipes are clamped and connected through the first clamping groove and the second clamping groove, the first flange and the second flange are connected to each other, and the PVC-FRP pipe is filled with concrete.

[0008] Preferably, the first flange and the second flange are connected by high-strength bolts.

[0009] Preferably, the high-strength bolts are M12, M16, M20, M24 or M30.

[0010] Preferably, the FRP used in the PVC-FRP pipe is AFRP, BFRP, GFRP or PFRP.

[0011] Preferably, the first L-shaped bottom plate, the second L-shaped bottom plate, the first connecting plate, the second connecting plate, the first flange plate and the second flange plate have the same thickness and are not less than 10 mm.

[0012] Preferably, the first L-shaped bottom plate and the second L-shaped bottom plate both extend out of the PVC-FRP pipe, and the distance that the first L-shaped bottom plate and the second L-shaped bottom plate extend out of the PVC-FRP pipe is twice the thickness of the first L-shaped bottom plate.

[0013] Preferably, the length of the sleeve is not less than 60 mm, and the thickness is 1 to 2 times the wall thickness of the PVC pipe.

[0014] Preferably, the first flange and the second flange are both provided with bolt holes, and the number of the bolt holes is not less than 4 and not more than 8.

[0015] Preferably, a grouting hole is provided on the PVC-FRP pipe, and the grouting hole is close to the sleeve.

[0016] A construction method for an assembled PVC-FRP tubular steel-concrete column, applied to the assembled PVC-FRP tubular steel-concrete column, comprises the following contents:

[0017] Prefabricate a PVC-FRP pipe, and install a first connecting piece, a second connecting piece and an I-beam on the PVC-FRP pipe; the first connecting piece includes a first connecting plate respectively vertically arranged on the lower area of ​​the two flange plates of the I-beam, a first L-shaped bottom plate arranged at the bottom of the I-beam, a first flange and a first sleeve, the first sleeve is sleeved on the outer surface of the PVC-FRP pipe, the first flange is sleeved on the outer surface of the PVC-FRP pipe and the lower surface of the flange is flush with the bottom surface of the PVC-FRP pipe, the first connecting plate passes through the PVC-FRP pipe and is connected to the first flange, and the bottom of the first sleeve is connected to the first flange The area between the first L-shaped bottom plate and the first connecting plate forms a first clamping groove; the second connecting member includes a second L-shaped bottom plate respectively vertically arranged on the upper area of ​​the two flange plates of the I-beam, a second connecting plate arranged on the second L-shaped bottom plate, a second flange and a second sleeve, the second sleeve is sleeved on the outer surface of the PVC-FRP pipe, the second flange is sleeved on the outer surface of the PVC-FRP pipe, the second connecting plate passes through the PVC-FRP pipe and is connected to the second flange, the top of the second sleeve is connected to the second flange, and the area between the second L-shaped bottom plate and the second connecting plate forms a second clamping groove;

[0018] Connecting the first connector on one of the PVC-FRP pipes to the second connector on the other PVC-FRP pipe; connecting the first clamping groove on one of the PVC-FRP pipes to the second clamping groove on the other PVC-FRP pipe; and connecting the first flange on one of the PVC-FRP pipes to the second flange on the other PVC-FRP pipe;

[0019] Grouting is performed through the grouting holes.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The connection method of the present invention is simple, the force transmission path at the connection is clear and reliable, and the construction is convenient. By arranging the first connecting plate, the second connecting plate, the first L-shaped bottom plate and the second L-shaped bottom plate at the connection to form a first clamping groove and a second clamping groove that are mutually clamped, and fixedly connected with the sleeve and the flange, the connection structure is more stable and has a certain recoverability, and the structural ductility and shear resistance can also be improved. In addition, the PVC-FRP tubular steel concrete column can be prefabricated in advance, and the components can be factory-produced, which effectively shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Attachment Figure 1 This is a schematic diagram of the overall connection of PVC-FRP tubular steel-concrete columns;

[0024] Attachment Figure 2 This is the cross-sectional view of the PVC-FRP tubular steel concrete column;

[0025] Attachment Figure 3 This is a schematic diagram of the bottom connection of the PVC-FRP tubular steel concrete column;

[0026] Attachment Figure 4 This is a schematic diagram of the top connection of the PVC-FRP tubular steel-concrete column;

[0027] Attachment Figure 5 This is a schematic diagram of the connection between PVC-FRP tubular steel-concrete columns;

[0028] Attachment Figure 6 Schematic diagram of the connecting plate;

[0029] Attachment Figure 7 Schematic diagram of the steel clip at the connection;

[0030] Among them, 1. PVC-FRP pipe; 2. I-beam; 3. First L-shaped base plate; 4. First connecting plate; 5. First flange; 6. First sleeve; 7. High-strength bolts; 8. Steel clips; 9. Concrete; 10. Grouting material; 11. Grouting hole; 12. Second L-shaped base plate; 13. Second connecting plate. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide an assembled PVC-FRP tube steel concrete column and a construction method thereof, so as to achieve the purpose of improving the bearing capacity and recovery capacity of the steel concrete column.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] refer to Figures 1 to 6, an assembled PVC-FRP tube-type steel concrete column, comprising mutually connected PVC-FRP tubes and a first connecting piece and a second connecting piece arranged at both ends of the PVC-FRP tube, wherein an I-beam of the same length as the PVC-FRP tube is arranged in the PVC-FRP tube, the first connecting piece comprises a first connecting plate respectively arranged vertically on the lower areas of the two flanges of the I-beam, a first L-shaped bottom plate arranged at the bottom of the I-beam, a first flange and a first sleeve, the first sleeve is sleeved on the outer surface of the PVC-FRP tube, the first flange is sleeved on the outer surface of the PVC-FRP tube and the lower surface of the flange is flush with the bottom surface of the PVC-FRP tube, the first connecting plate passes through the PVC-FRP tube and is connected to the first flange, the bottom of the first sleeve is connected to the first flange, and the area between the first L-shaped bottom plate and the first connecting plate forms a first clamping groove, the second connecting piece comprises a second L-shaped bottom plate respectively arranged vertically on the upper areas of the two flanges of the I-beam, a second connecting plate arranged on the second L-shaped bottom plate, a second flange The flange and the second sleeve, the second sleeve are sleeved on the outer surface of the PVC-FRP pipe, the second flange is sleeved on the outer surface of the PVC-FRP pipe, the second connecting plate passes through the PVC-FRP pipe and is connected to the second flange, the top of the second sleeve is connected to the second flange, the area between the second L-shaped bottom plate and the second connecting plate forms a second clamping groove, the adjacent PVC-FRP pipes are clamped and connected through the first clamping groove and the second clamping groove, the first flange and the second flange are connected to each other, and the PVC-FRP pipe is filled with concrete; the connection method of the present invention is simple, the force transmission path at the connection is clear and reliable, and the construction is convenient. By arranging the first connecting plate, the second connecting plate, the first L-shaped bottom plate and the second L-shaped bottom plate at the connection to form the first clamping groove and the second clamping groove that are clamped to each other, and fixedly connected with the sleeve and the flange, the connection structure is more stable and has a certain recoverability, and can also improve the structural ductility and shear resistance. In addition, the PVC-FRP pipe steel concrete column can be prefabricated in advance, and the components can be factory-produced, which effectively shortens the construction period.

[0035] refer to Figure 1 The first flange and the second flange are connected by high-strength bolts.

[0036] Furthermore, the high-strength bolts are M12, M16, M20, M24 or M30.

[0037] Furthermore, the FRP used in the PVC-FRP pipe is AFRP, BFRP, GFRP or PFRP.

[0038] Furthermore, the first L-shaped bottom plate, the second L-shaped bottom plate, the first connecting plate, the second connecting plate, the first flange plate and the second flange plate have the same thickness and are not less than 10 mm.

[0039] Furthermore, the first L-shaped bottom plate and the second L-shaped bottom plate both extend out of the PVC-FRP pipe, and the distance that the first L-shaped bottom plate and the second L-shaped bottom plate extend out of the PVC-FRP pipe is twice the thickness of the first L-shaped bottom plate.

[0040] Furthermore, the length of the sleeve is not less than 60 mm, and the thickness is 1 to 2 times the wall thickness of the PVC pipe.

[0041] Furthermore, the first flange and the second flange are both provided with bolt holes, and the number of the bolt holes is not less than 4 and not more than 8.

[0042] refer to Figure 1 The PVC-FRP pipe is provided with a grouting hole, and the grouting hole is close to the sleeve.

[0043] A construction method for assembled PVC-FRP tubular steel concrete columns, comprising the following:

[0044] First, fiber-reinforced plastic (FRP) strips impregnated with epoxy resin are wrapped around a PVC pipe at a fixed interval. The FRP strips must be tightened during the wrapping process to ensure close contact between the FRP and the PVC pipe. The width, spacing, and number of FRP strips are calculated and determined based on the design bearing capacity of the column. The PVC-FRP pipe is cured at room temperature until the epoxy resin cures, forming a PVC-FRP pipe.

[0045] Fabricate column I-beams, the first L-shaped bottom plate, the second L-shaped bottom plate, the first connecting plate, the second connecting plate, the first flange, the second flange, the first sleeve, and the second sleeve in a steel structure processing plant; and weld and connect them as required;

[0046] During on-site installation, first use a lifting device to vertically insert the end with the first clip groove into the second clip groove on the installed PVC-FRP pipe. When the upper and lower column flanges are tightly aligned, rotate the upper column counterclockwise 90° so that the first L-shaped base plate of the upper column is placed in the center of the second connecting plate and the second L-shaped steel base plate of the lower column, ensuring that the bolt holes of the upper and lower column flanges are aligned. After the upper column L-shaped steel base plate forms intersecting slots with the lower column steel connecting plate and L-shaped steel base plate, high-strength bolts are inserted through the flanges to connect the upper and lower PVC-FRP pipe steel concrete columns. After installation is complete, high-strength grouting material is injected into the steel connecting plate and L-shaped steel base plate area at the connection through the grouting holes on the PVC-FRP pipe. To prevent the connection from shifting and ensure an aesthetically pleasing appearance, after grouting is completed, the connection gap at the outer connection of the flange is sealed with a steel clip.

[0047] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0048] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed therein. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. An assembled PVC-FRP tubular steel concrete column, characterized in that: The invention comprises a PVC-FRP pipe connected to each other and a first connector and a second connector arranged at both ends of the PVC-FRP pipe, an I-beam of the same length as the PVC-FRP pipe is arranged in the PVC-FRP pipe, the first connector comprises a first connecting plate respectively arranged vertically on the lower areas of the two flange plates of the I-beam, a first L-shaped bottom plate, a first flange and a first sleeve arranged at the bottom of the I-beam, the first sleeve is sleeved on the outer surface of the PVC-FRP pipe, the first flange is sleeved on the outer surface of the PVC-FRP pipe and the lower surface of the flange is flush with the bottom surface of the PVC-FRP pipe, the first connecting plate passes through the PVC-FRP pipe and is connected to the first flange, the bottom of the first sleeve is connected to the first flange, the first L-shaped bottom plate is connected to the first The area between the connecting plates forms a first clamping groove, and the second connecting member includes a second L-shaped bottom plate respectively vertically arranged on the upper area of ​​the two flange plates of the I-beam, a second connecting plate, a second flange and a second sleeve arranged on the second L-shaped bottom plate, the second sleeve is sleeved on the outer surface of the PVC-FRP pipe, the second flange is sleeved on the outer surface of the PVC-FRP pipe, the second connecting plate passes through the PVC-FRP pipe and is connected to the second flange, the top of the second sleeve is connected to the second flange, and the area between the second L-shaped bottom plate and the second connecting plate forms a second clamping groove, adjacent PVC-FRP pipes are clamped and connected through the first clamping groove and the second clamping groove, the first flange and the second flange are connected to each other, and the PVC-FRP pipe is filled with concrete.

2. The assembled PVC-FRP tubular steel concrete column according to claim 1, characterized in that: The first flange and the second flange are connected by high-strength bolts.

3. The assembled PVC-FRP tubular steel concrete column according to claim 2, characterized in that: The high-strength bolts are M12, M16, M20, M24 or M30.

4. The assembled PVC-FRP tubular steel concrete column according to claim 1, characterized in that: The FRP used in the PVC-FRP pipe is AFRP, BFRP, GFRP or PFRP.

5. The assembled PVC-FRP tubular steel concrete column according to claim 1, characterized in that: The thickness of the first L-shaped bottom plate, the second L-shaped bottom plate, the first connecting plate, the second connecting plate, the first flange and the second flange are the same and not less than 10 mm.

6. The assembled PVC-FRP tubular steel concrete column according to claim 5, characterized in that: The first L-shaped bottom plate and the second L-shaped bottom plate both extend out of the PVC-FRP pipe, and the distance that the first L-shaped bottom plate and the second L-shaped bottom plate extend out of the PVC-FRP pipe is twice the thickness of the first L-shaped bottom plate.

7. The assembled PVC-FRP tubular steel concrete column according to claim 1, characterized in that: The length of the sleeve is not less than 60 mm, and the thickness is 1 to 2 times the wall thickness of the PVC pipe.

8. The assembled PVC-FRP tubular steel concrete column according to claim 7, characterized in that: The first flange and the second flange are both provided with bolt holes, and the number of the bolt holes is not less than 4 and not more than 8.

9. The assembled PVC-FRP tubular steel concrete column according to claim 1, characterized in that: A grouting hole is provided on the PVC-FRP pipe, and the grouting hole is close to the sleeve.

10. A construction method for assembled PVC-FRP tube steel concrete columns, characterized in that: An assembled PVC-FRP tubular steel-concrete column according to any one of claims 1 to 9, comprising the following: Wrap the FRP strips impregnated with epoxy resin around the PVC pipe at a certain interval. During the wrapping process, the FRP strips must be tightened to ensure close contact between the FRP and the PVC pipe. The width, spacing, and number of FRP strips can be calculated and determined based on the design value of the column bearing capacity. Curing the PVC-FRP pipe at room temperature until the epoxy resin is cured to form a PVC-FRP pipe. Fabricate column I-beams, the first L-shaped bottom plate, the second L-shaped bottom plate, the first connecting plate, the second connecting plate, the first flange, the second flange, the first sleeve, and the second sleeve in a steel structure processing plant; and weld and connect them as required; During on-site installation, first extend the end with the first clamping groove vertically into the second clamping groove on the installed PVC-FRP pipe through the lifting equipment. When the upper and lower column flanges are closely aligned, rotate the upper column counterclockwise 90° so that the first L-shaped base plate of the upper column is placed on the center of the second connecting plate and the second L-shaped steel base plate of the lower column to ensure that the bolt holes of the upper and lower column flanges are aligned. After the upper column L-shaped steel base plate and the lower column steel connecting plate and L-shaped steel base plate form mutually intersecting clamping grooves, high-strength bolts are passed through the flange to connect the upper and lower PVC-FRP pipe steel concrete columns. After installation is completed, high-strength grouting material is injected into the steel connecting plate and L-shaped steel base plate area at the connection through the grouting holes on the PVC-FRP pipe. In order to prevent the connection from shifting and ensure a beautiful appearance, after grouting is completed, the connection gap is sealed with a steel clip at the outer connection port of the flange.

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