A large-diameter steel-concrete composite column with improved interfacial properties and its construction method

Abstract

This invention discloses a large-diameter steel-concrete composite column with improved interface performance, comprising multiple steel-concrete composite column segments, with adjacent segments connected by a beam-column joint. Each steel-concrete composite column includes an inner steel tube, the inner wall of which is provided with multiple arc-shaped ribs and core concrete is poured inside, while outer concrete is poured on the outside. Connecting tenons are provided at both ends of the inner steel tube, with bolt holes on the tenons. The beam-column joint includes an inner steel tube, the inner wall of which is provided with circumferential stiffening ribs, and a grid-shaped stiffening plate is provided inside. A tenon groove is provided at the connection between the beam-column joint and the adjacent steel-concrete composite column segments, with bolt holes within the groove. Beam connectors are welded to the outer side of the inner steel tube. Joint concrete is poured on the outer side of the inner steel tube. The steel-concrete composite column and the beam-column joint are assembled and connected by the connecting tenons and tenon grooves, and then reinforced with bolts.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering structural design and construction technology, and relates to a large-diameter steel tube concrete column with improved interface performance and a construction method thereof. Background Technology

[0002] In recent years, domestic construction technology has developed rapidly, and many coastal cities have built high-rise and super high-rise buildings. Steel-tube concrete (SPC) structures are frequently seen in these projects. SPC structures offer advantages such as high load-bearing capacity, good plasticity and ductility, and the steel tubes are prefabricated in factories, eliminating the need for formwork construction, making them widely popular. However, in the construction of super high-rise buildings, large-diameter SPC columns are often used. Due to the large diameter of the steel tubes, existing large-diameter SPC columns experience a significant reduction in the bond strength between the concrete and the inner wall of the steel tube before reaching their ultimate load-bearing capacity, potentially causing the structure to fail before reaching its ultimate load-bearing capacity.

[0003] Existing steel-concrete composite column structures mostly employ on-site construction methods such as steel pipe welding. However, the welding process for the outer pipe presents technical challenges due to its high difficulty and risk, which can easily affect the quality of the project. Conventional steel-concrete composite columns are usually connected to beams using steel beams, which is quite difficult to achieve. Furthermore, the outer side of a conventional steel-concrete composite column is made of steel pipe, which is prone to corrosion and rust over long-term use. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a large-diameter steel-concrete composite column with improved interface performance and a construction method thereof.

[0005] A large-diameter steel-concrete composite column that can improve interface performance includes multiple steel-concrete composite column segments, with adjacent steel-concrete composite column segments connected by beam-column joints.

[0006] The steel-concrete composite column includes a steel tube inside the steel tube, and the inner wall of the steel tube inside the steel tube is provided with multiple arc-shaped ribs; the core concrete is poured inside the steel tube inside the steel tube, and the outer concrete is poured outside the steel tube; the two ends of the steel tube inside the steel tube are provided with connecting tenons, and the connecting tenons are provided with column bolt holes.

[0007] The beam-column joint includes a steel pipe inside the joint, with circumferential stiffening ribs on the inner wall of the steel pipe and a grid-shaped stiffening plate inside the steel pipe. The connection between the steel pipe inside the joint and the adjacent two sections of steel pipe concrete column is provided with a tenon groove, and the tenon groove is provided with a joint bolt hole. Beam connectors are welded to the outside of the steel pipe inside the joint. Joint concrete is poured on the outside of the steel pipe inside the joint.

[0008] The steel-concrete composite column and beam-column joints are assembled and connected by connecting tenons and tenon slots, and then reinforced by bolts.

[0009] Furthermore, multiple arc-shaped ribs are evenly spaced along the axial direction of the steel tube inside the concrete-filled steel tube column, with two arc-shaped ribs at the same axial height. The arc-shaped ribs are either clockwise or counterclockwise. The clockwise arc-shaped ribs rotate downwards in a clockwise direction on the inner wall of the steel tube inside the concrete-filled steel tube column, while the counterclockwise arc-shaped ribs rotate downwards in a counterclockwise direction on the inner wall of the steel tube inside the concrete-filled steel tube column.

[0010] Furthermore, when installing two adjacent steel-concrete composite columns, steel-concrete composite columns with clockwise arc ribs and steel-concrete composite columns with counterclockwise arc ribs are installed alternately.

[0011] Furthermore, multiple connecting tenons are arranged in a circular array at both ends of the steel tube inside the steel tube concrete column, and the arrangement of the tenon grooves at both ends of the steel tube inside the node is the same as that of the connecting tenons.

[0012] Furthermore, four beam connectors are uniformly welded to the outside of the steel pipe within the node; the beam connectors include a rectangular outer frame and triangular stiffening ribs set inside the rectangular outer frame.

[0013] Furthermore, the node concrete is provided with grouting holes for filling the gap between the connecting tenon and the tenon groove, and bolt mounting holes for installing bolts.

[0014] Furthermore, the length of the bolt shank is no more than five times the diameter of the shank.

[0015] Furthermore, the steel used in the steel-concrete composite column and beam-column joints shall have a strength of not less than Q420.

[0016] A construction method for large-diameter steel-concrete composite columns that can improve interfacial properties includes:

[0017] Step 1: The steel pipe inside the steel-concrete composite column is integrally formed with the connecting tenons at both ends in the factory, and column bolt holes are pre-drilled on the connecting tenons;

[0018] Step 2: Weld clockwise or counterclockwise arc-shaped ribs at equal intervals along the axial direction inside the steel tube of the steel tube concrete column;

[0019] Step 3: Construct an external mold according to the dimensions of the concrete outside the steel pipe, and pour the core concrete and the concrete outside the steel pipe at the same time. During the pouring process, the poured concrete is subjected to high-frequency and strong vibration. When the concrete outside the steel pipe reaches the strength requirements, the mold is removed. The poured concrete outside the steel pipe and the core concrete are steam cured and demolded.

[0020] Step 4: Based on the dimensions of the connecting tenon, set the corresponding tenon groove on the steel pipe inside the node and reserve the node bolt holes in the tenon groove;

[0021] Step 5: Weld beam connectors to the outside of the steel pipe inside the node, and weld circumferential stiffening ribs, grid-shaped stiffening plates, and nuts for bolt assembly to the inside of the steel pipe inside the node;

[0022] Step 6: Build an external mold according to the dimensions of the joint concrete, and reserve the tenon groove, grouting hole and bolt installation hole. Pour the joint concrete and perform high-frequency strong vibration during the pouring process. When the joint concrete reaches the strength requirements, remove the mold and steam cure and demold the poured joint concrete.

[0023] Step 7: After the components are manufactured in the factory, insert the connecting tenon at the end of the steel-concrete composite column into the tenon groove at the end of the beam-column joint, rotate it at a certain angle in the corresponding direction, align the column bolt holes with the joint bolt holes, and install the bolts through the reserved bolt installation holes to complete the connection between the steel-concrete composite column and the beam-column joint.

[0024] Step 8: Repeat step 7 to install the steel-concrete composite columns with clockwise arc ribs and the steel-concrete composite columns with counterclockwise arc ribs in an alternating manner with the beam-column joints.

[0025] Step 9: Inject grout into the grouting holes and bolt mounting holes to complete the installation.

[0026] The large-diameter steel-concrete composite column of the present invention, which improves interfacial properties, has at least the following beneficial effects:

[0027] 1. This invention improves the interfacial properties between concrete and steel pipe by welding spiral arc-shaped ribs into the steel pipe inside the concrete-steel pipe column, thereby increasing the bonding force between the concrete and the inner wall of the steel pipe. This prevents large-diameter concrete-steel pipe columns from failing before reaching their ultimate bearing capacity, reduces economic losses, and expands the application scope of large-diameter concrete-steel pipe columns.

[0028] 2. In this invention, the steel-concrete composite column and beam-column joints are prefabricated in the factory. The connection can be achieved by grouting only the connection joint, which saves time and ensures construction quality.

[0029] 3. The beam-column joint is reserved for connection with the beam. After the large-diameter steel pipe concrete column is constructed, it can be connected to the beam. When the steel pipe concrete column and the beam-column joint are prefabricated in the factory, the outer layer of concrete is poured to protect the steel pipe from corrosion and rust. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the large-diameter steel-concrete composite column that improves interface performance according to the present invention.

[0031] Figure 2 This is an axial cross-sectional schematic diagram of a large-diameter steel-concrete composite column that improves interface performance according to the present invention.

[0032] Figure 3 A schematic diagram of the axial section of a concrete-filled steel tube column with clockwise arc-shaped ribs.

[0033] Figure 4 A schematic diagram of the axial section of a concrete-filled steel tube column with counterclockwise arc-shaped ribs.

[0034] Figure 5 This is a schematic diagram of the beam-column joint.

[0035] Figure 6 This is a schematic diagram of the axial cross-section of a beam-column joint.

[0036] Figure 7 This is a magnified view of the connection between the beam-column joint and the steel-concrete composite column;

[0037] Figure 8 This is a schematic diagram showing the connection between the steel pipes inside the steel-concrete composite column and the steel pipes inside the joint.

[0038] 1-Concrete-filled steel tube column, 11-Steel tube inside the concrete-filled steel tube column, 12-Clockwise arc rib, 13-Counterclockwise arc rib, 14-Connecting tenon, 15-Column bolt hole, 16-Core concrete, 17-Concrete outside the steel tube, 2-Beam-column joint, 21-Steel tube inside the joint, 22-Circular stiffening rib, 23-Grid stiffening plate, 24-Beam connector, 25-Joint bolt hole, 26-Connecting bolt, 27-Joint concrete, 271-Grouting hole, 272-Bolt mounting hole, 28-Tent groove. Detailed Implementation

[0039] like Figure 1-8 As shown, the present invention provides a large-diameter steel-concrete composite column with improved interface performance, comprising multiple steel-concrete composite column segments 1, with adjacent steel-concrete composite column segments 1 connected by beam-column joints 2.

[0040] The steel-concrete composite column 1 includes an inner steel pipe 11, the inner wall of which is provided with multiple arc-shaped ribs; the inner steel pipe 11 is filled with core concrete 16 and the outer steel pipe concrete 17 is poured on the outside; the two ends of the inner steel pipe 11 are provided with connecting tenons 14, and the connecting tenons 14 are provided with column bolt holes 15.

[0041] During the fabrication of the steel-concrete composite column 1, the arc-shaped ribs on the inner wall of the steel pipe 11 inside the steel-concrete composite column will be inserted into the concrete when the core concrete is poured. After the concrete has cured, the steel pipe and the concrete will form a whole, which will enhance the bond between the steel pipe 11 inside the steel-concrete composite column and the core concrete 16.

[0042] The beam-column joint 2 includes an inner steel pipe 21, with circumferential stiffening ribs 22 on the inner wall of the inner steel pipe 21, and a grid-shaped stiffening plate 23 inside the inner steel pipe 21. At the connection points between the two ends of the inner steel pipe 21 and the adjacent two sections of steel-concrete composite column 1, there are tenon grooves 28, with bolt holes 25 inside the tenon grooves 28. Beam connectors 24 are welded to the outer side of the inner steel pipe 21. Node concrete 27 is poured on the outer side of the inner steel pipe 21. Specifically, four beam connectors 24 are evenly welded to the outer side of the inner steel pipe 21. Each beam connector 24 includes a rectangular outer frame and triangular stiffening ribs inside the rectangular outer frame. When fabricating the beam-column joint 2, circumferential stiffening ribs 22 and grid-shaped stiffening plates 23 are welded inside the inner steel pipe 21 to enhance the strength of the joint and prevent the joint from failing before the structural members.

[0043] The steel-concrete composite column 1 and the beam-column joint 2 are assembled and connected by connecting tenons 14 and tenon slots 28, and then reinforced by bolts. Multiple connecting tenons 14 are arranged in a circular array at both ends of the steel pipe 11 inside the steel-concrete composite column, and the tenon slots 28 set at both ends of the steel pipe 21 inside the joint are arranged in the same way as the connecting tenons 14.

[0044] This invention involves pouring concrete on the outside of the steel pipe 11 inside the steel pipe column and the steel pipe 21 inside the node, which serves as an isolation layer between the steel pipe and water vapor in the air and other corrosive substances. This effectively resists the erosion of the steel pipe by water vapor and other substances, enhances the anti-corrosion and anti-rust properties of the steel pipe, and thus protects the steel pipe. Overall, this improves the performance of the steel pipe concrete and reduces technical costs.

[0045] like Figure 3 and 4 As shown, multiple arc-shaped ribs are evenly spaced along the axial direction of the steel pipe 11 inside the steel-concrete composite column, with two arc-shaped ribs at the same axial height. In specific implementation, the arc-shaped ribs are either clockwise arc-shaped ribs 12 or counterclockwise arc-shaped ribs 13. The clockwise arc-shaped ribs 12 rotate downwards in a clockwise direction on the inner wall of the steel pipe 11 inside the steel-concrete composite column, while the counterclockwise arc-shaped ribs 13 rotate downwards in a counterclockwise direction on the inner wall of the steel pipe 11 inside the steel-concrete composite column. When installing two adjacent steel-concrete composite column sections 1, the steel-concrete composite column 1 with clockwise arc-shaped ribs 12 and the steel-concrete composite column 1 with counterclockwise arc-shaped ribs 13 are installed alternately.

[0046] When assembling the overall large-diameter steel-concrete composite column through multiple segments of steel-concrete composite column 1 and beam-column joint 2, the steel-concrete composite column 1 with clockwise arc ribs 12 and the steel-concrete composite column 1 with counterclockwise arc ribs 13 are installed alternately. This prevents relative slippage between the internal concrete part and the steel pipe part of the overall large-diameter steel-concrete composite column, improves the interface performance of the concrete, increases the bonding performance between the concrete and the steel pipe, and allows the steel pipe and concrete to share the load. This greatly improves the load-bearing capacity of the overall structure and also prevents the steel-concrete composite member from failing before reaching its maximum load-bearing capacity.

[0047] like Figure 5 and 6 As shown, the node concrete 27 is provided with grouting holes 271 for filling the gap between the connecting tenon 14 and the tenon groove 28 and bolt mounting holes 272 for installing bolts 26.

[0048] In practice, the length of the bolt 26 is no more than five times its diameter. This prevents shear failure at the end of the component.

[0049] In specific implementation, the steel used in the steel-concrete composite columns and beam-column joints shall have a strength of not less than Q420. Q420 steel has high strength, good fatigue resistance, high toughness and low ductile-brittle transition temperature, good cold forming and welding performance, good corrosion resistance and certain wear resistance.

[0050] This invention also provides a construction method for large-diameter steel-concrete composite columns, comprising:

[0051] Step 1: The steel pipe inside the steel-concrete composite column is integrally formed with the connecting tenons at both ends in the factory, and column bolt holes are pre-drilled on the connecting tenons;

[0052] Step 2: Weld clockwise or counterclockwise arc-shaped ribs at equal intervals along the axial direction inside the steel tube of the steel tube concrete column;

[0053] Step 3: Construct an external mold according to the dimensions of the concrete outside the steel pipe, and pour the core concrete and the concrete outside the steel pipe at the same time. During the pouring process, the poured concrete is subjected to high-frequency and strong vibration. When the concrete outside the steel pipe reaches the strength requirements, the mold is removed. The poured concrete outside the steel pipe and the core concrete are steam cured and demolded.

[0054] Step 4: Based on the dimensions of the connecting tenon, set the corresponding tenon groove on the steel pipe inside the node and reserve the node bolt holes in the tenon groove;

[0055] Step 5: Weld beam connectors to the outside of the steel pipe inside the node, and weld circumferential stiffening ribs, grid-shaped stiffening plates, and nuts for bolt assembly to the inside of the steel pipe inside the node;

[0056] Step 6: Build an external mold according to the dimensions of the joint concrete, and reserve the tenon groove, grouting hole and bolt installation hole. Pour the joint concrete and perform high-frequency strong vibration during the pouring process. When the joint concrete reaches the strength requirements, remove the mold and steam cure and demold the poured joint concrete.

[0057] Step 7: After the components are manufactured in the factory, insert the connecting tenon at the end of the steel-concrete composite column into the tenon groove at the end of the beam-column joint, rotate it at a certain angle in the corresponding direction, align the column bolt holes with the joint bolt holes, and install the bolts through the reserved bolt installation holes to complete the connection between the steel-concrete composite column and the beam-column joint.

[0058] Step 8: Repeat step 7 to install the steel-concrete composite columns with clockwise arc ribs and the steel-concrete composite columns with counterclockwise arc ribs in an alternating manner with the beam-column joints.

[0059] Step 9: Inject grout into the grouting holes and bolt mounting holes to complete the installation.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the ideas of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large diameter concrete filled steel tubular column with improved interface performance, characterized in that, The steel pipe concrete column comprises a steel pipe concrete column inner steel pipe, and the inner wall of the steel pipe concrete column inner steel pipe is provided with a plurality of arc-shaped ribs; the inside of the steel pipe concrete column inner steel pipe is poured with core concrete, and the outside is poured with outer steel pipe concrete; the two ends of the steel pipe concrete column inner steel pipe are provided with connecting tenons, and the connecting tenons are provided with column bolt holes; The beam-column joint comprises a joint inner steel pipe, the inner wall of the joint inner steel pipe is provided with a hoop stiffening rib, and the inside of the joint inner steel pipe is provided with a cross-shaped stiffening plate; the joint inner steel pipe of the beam-column joint is provided with a tenon groove at the connection position of the adjacent two steel pipe concrete columns, and the tenon groove is provided with a joint bolt hole; the outer side of the joint inner steel pipe is welded with a beam connecting piece; and the outer side of the joint inner steel pipe is poured with joint concrete; The steel pipe concrete column and the beam-column joint are connected through the cooperation of the connecting tenon and the tenon groove and are reinforced through bolts; A plurality of arc-shaped ribs are arranged at equal intervals along the axial direction of the steel pipe concrete column inner steel pipe, and two arc-shaped ribs are arranged at the same height in the axial direction; the arc-shaped ribs are clockwise arc-shaped ribs or counterclockwise arc-shaped ribs, the clockwise arc-shaped rib is inclined downward along the clockwise direction on the inner wall of the steel pipe concrete column inner steel pipe, and the counterclockwise arc-shaped rib is inclined downward along the counterclockwise direction on the inner wall of the steel pipe concrete column inner steel pipe; When the adjacent two steel pipe concrete columns are installed, the steel pipe concrete column provided with the clockwise arc-shaped rib and the steel pipe concrete column provided with the counterclockwise arc-shaped rib are installed alternately; A plurality of connecting tenons are arranged at the two ends of the steel pipe concrete column inner steel pipe in a circumferential array, and the arrangement mode of the tenon grooves arranged at the two ends of the joint inner steel pipe is the same as that of the connecting tenons; Four beam connecting pieces are uniformly welded on the outer side of the joint inner steel pipe; the beam connecting piece comprises a rectangular outer frame and a triangular stiffening rib arranged in the rectangular outer frame; The joint concrete is provided with a grouting hole for filling the gap between the connecting tenon and the tenon groove and a bolt mounting hole for mounting the bolt. The length of the screw rod of the bolt is not greater than five times the diameter of the screw rod.

2. The large diameter concrete filled steel tubular column with improved interfacial performance according to claim 1, wherein The strength of the steel used in the steel pipe concrete column and the beam-column joint is not less than Q420.

3. The large diameter concrete filled steel tubular column with improved interfacial performance according to claim 1, wherein Comprise:

4. A construction method of a large diameter concrete filled steel tubular column having improved interface performance according to any one of claims 1 to 3, characterized in that, Step 1: integrally form the steel pipe concrete column inner steel pipe and the connecting tenons at the two ends in a factory, and reserve column bolt holes on the connecting tenons; Step 2: weld clockwise arc-shaped ribs or counterclockwise arc-shaped ribs at equal intervals along the axial direction in the inside of the steel pipe concrete column inner steel pipe; Step 3: build an external mold according to the size of the outer steel pipe concrete, pour the core concrete and the outer steel pipe concrete at the same time, and perform high-frequency strong vibration on the poured concrete during the pouring process; when the outer steel pipe concrete reaches the strength requirement, the mold is removed, and the poured outer steel pipe concrete and core concrete are subjected to steam curing and demolding; Step 4: set the corresponding tenon grooves on the joint inner steel pipe according to the size of the connecting tenon, and reserve joint bolt holes in the tenon grooves; Step 5: weld beam connecting pieces on the outer side of the joint inner steel pipe, and weld hoop stiffening ribs, cross-shaped stiffening plates and nuts for bolt assembly in the joint inner steel pipe. ​ Step 6: Build an external mold according to the size of the node concrete, reserve the tenon slot, grouting hole, bolt mounting hole, pour the node concrete, and perform high-frequency strong vibration during pouring. When the node concrete reaches the strength requirement, remove the mold, and perform steam curing and demolding on the poured node concrete; Step 7: After the completion of the component production in the factory, insert the connecting tenon at the end of the steel pipe concrete column into the tenon slot at the end of the beam-column node, rotate it by a certain angle according to the corresponding direction, align the column bolt hole with the node bolt hole, install the bolt through the reserved bolt mounting hole, and complete the connection of the steel pipe concrete column and the beam-column node; Step 8: Repeat Step 7 to alternately install the steel pipe concrete column with the clockwise arc-shaped rib and the steel pipe concrete column with the counterclockwise arc-shaped rib with the beam-column node; Step 9: Inject grout into the grouting hole and the bolt mounting hole, and complete the installation.

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