Variable-cross-section composite stainless steel pipe concrete combination column and mounting method thereof

Abstract

The invention relates to the technical field of bridge pier buildings, in particular to a variable-cross-section composite stainless steel pipe concrete combination column and a mounting method thereof. A variable-cross-section composite stainless steel pipe concrete combination column comprises a first stainless steel pipe and a second stainless steel pipe, and the cross section size of the second stainless steel pipe is larger than that of the first stainless steel pipe. The interiors of the first stainless steel pipe and the second stainless steel pipe are connected through the embedded steel bar connecting module, the exteriors of the first stainless steel pipe and the second stainless steel pipe are connected through the outer hoop connecting module, and the interiors of the second stainless steel pipe and the first stainless steel pipe are filled with concrete. The bearing capacity and the anti-seismic property of the combined column are improved, and the combined column is suitable for piers of bridges and particularly suitable for piers of ultra-high and ultra-long bridges.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge pier construction, in particular to a variable cross-section composite stainless steel pipe concrete composite column and a mounting method thereof. BACKGROUND

[0002] The steel pipe concrete composite structure has the advantages of high bearing capacity and good ductility, and is one of the main structural forms of railway bridge piers. In order to overcome the terrain restrictions, reduce the structural self-weight, and save the engineering cost, the cross-sectional size of the upper column needs to be gradually reduced with the increase of the height of the bridge pier.

[0003] The existing variable cross-section composite column mostly adopts a welding process, but the conventional steel pipe concrete structure has the following technical defects in the application of super high-rise bridges:

[0004] (1) Low-temperature welding easily causes interface brittle fracture;

[0005] (2) High-altitude temperature and pressure changes cause the ductility of the welding material to decrease and the heat stability of the molten pool to deteriorate, resulting in uneven weld performance and increased fracture risk;

[0006] (3) The structural bending stiffness is insufficient, and it is difficult to meet the lateral resistance demand under strong wind load;

[0007] (4) The welding process control precision is insufficient under the complex high-altitude environment, further aggravating the interface peeling risk. SUMMARY

[0008] The present application aims to overcome the above-mentioned defects in the prior art and provides a variable cross-section composite stainless steel pipe concrete composite column and a mounting method thereof.

[0009] In order to achieve the above-mentioned purpose, the variable cross-section composite stainless steel pipe concrete composite column comprises a first stainless steel pipe and a second stainless steel pipe, and the cross-sectional size of the second stainless steel pipe is larger than that of the first stainless steel pipe.

[0010] The inside of the first stainless steel pipe and the second stainless steel pipe is connected by a planted steel connecting module, the outside of the first stainless steel pipe and the second stainless steel pipe is connected by an external hoop connecting module, and the inside of the second stainless steel pipe and the first stainless steel pipe is filled with concrete.

[0011] In the present application, the first stainless steel pipe and the second stainless steel pipe are cylindrical stainless steel pipes or square stainless steel pipes.

[0012] The planted steel connecting module comprises,

[0013] a first steel bar positioning and anchoring plate inserted into the first stainless steel pipe;

[0014] a second steel bar positioning and anchoring plate inserted into the second stainless steel pipe;

[0015] The high-strength steel bars, the first steel bar positioning anchor plate and the second steel bar positioning anchor plate are all provided with connection holes, and the two ends of the high-strength steel bars are respectively inserted into the connection holes of the first steel bar positioning anchor plate and the second steel bar positioning anchor plate, and fixed by embedded bolts.

[0016] A plurality of first inner anti-slip positioning keys are fixed to the inner wall of the first stainless steel tube, and a plurality of first outer anti-slip inner positioning keys are located on the same circumferential surface, for locating the position of the first steel bar positioning anchor plate in the first stainless steel tube;

[0017] Several second inner anti-slip positioning keys are fixed inside the second stainless steel tube. The several second inner anti-slip positioning keys are located on the same circumferential surface and are used to locate the position of the second steel bar positioning anchor plate inside the second stainless steel tube.

[0018] The outer hoop connection module includes:

[0019] A longitudinal stiffening plate is arranged along the axial direction of the first stainless steel tube and the second stainless steel tube, and a plurality of longitudinal stiffening plates are arranged at intervals along the circumference of the first stainless steel tube and the second stainless steel tube. The longitudinal stiffening plates are stepped toward the sides of the first stainless steel tube and the second stainless steel tube, so as to fit the outer surfaces of the first stainless steel tube and the second stainless steel tube;

[0020] Circumferential stiffening ribs: several groups of circumferential stiffening ribs are arranged at intervals along the axial direction of the first stainless steel tube and the second stainless steel tube. Each group of circumferential stiffening ribs includes several circumferential stiffening ribs located on the same circumferential surface of the first stainless steel tube and the second stainless steel tube. The circumferential stiffening ribs connect two adjacent longitudinal stiffening plates.

[0021] The outer hoop connection module comprises at least two parts, each of which comprises a longitudinal stiffening plate and annular stiffening ribs;

[0022] The adjacent longitudinal stiffening plates of the adjacent parts are fixedly connected by bolts, so that the parts surround the outer periphery of the first stainless steel tube and the second stainless steel tube.

[0023] A plurality of first external anti-slip positioning keys are fixed to the outer wall of the first stainless steel tube, and the plurality of first external anti-slip positioning keys are located on the same circumferential surface of the first stainless steel tube;

[0024] A plurality of second outer anti-slip positioning keys are fixed to the outer wall of the second stainless steel tube, and the plurality of second outer anti-slip positioning keys are located on the same circumferential surface of the second stainless steel tube;

[0025] The outer hoop connection module is located between the first outer anti-slip positioning key and the second outer anti-slip positioning key, thereby positioning the outer hoop connection module outside the first stainless steel tube and the second stainless steel tube.

[0026] The interior of the anchor bar connection module is provided with built-in high-strength steel, and the high-strength steel runs through the first stainless steel pipe and the second stainless steel pipe.

[0027] The present application also discloses a method for installing the above-mentioned variable-section composite stainless steel tube concrete composite column, comprising the following steps:

[0028] S1. Manufacturing a first stainless steel tube and a second stainless steel tube;

[0029] S2. Making an outer hoop connection module so that the inner surface of the outer hoop connection module fits the outer surfaces of the first stainless steel tube and the second stainless steel tube;

[0030] S3. Build the rebar connection module;

[0031] S4. Insert the rebar connection module into the first stainless steel tube and the second stainless steel tube respectively, so that the rebar connection module is located inside the connection between the first stainless steel tube and the second stainless steel tube;

[0032] S5. Installing an outer hoop connection module outside the connection between the first stainless steel tube and the second stainless steel tube;

[0033] S6. Pour concrete into the first stainless steel tube and the second stainless steel tube through the opening of the first stainless steel tube.

[0034] In step S1, inner anti-slip positioning keys are welded and fixed inside the first stainless steel tube and the second stainless steel tube, and outer anti-slip positioning keys are welded and fixed outside the first stainless steel tube and the second stainless steel tube;

[0035] In step S2, longitudinal stiffening plates and annular stiffening ribs are manufactured, wherein the longitudinal stiffening plates are stepped toward the sides of the first and second stainless steel tubes and are adapted to the outer diameters of the first and second stainless steel tubes; the longitudinal stiffening plates and the annular stiffening ribs are welded and fixedly connected;

[0036] In step S3, high-strength steel bars are sequentially inserted into the steel bar reserved holes of the first steel bar positioning anchor plate and the second steel bar positioning anchor plate, and fixed with anchor bolts;

[0037] In step S4, the rebar planting connection module is inserted into the second stainless steel tube, the second rebar positioning anchor plate contacts the second inner anti-slip positioning key, and the position of the rebar planting connection module in the second stainless steel tube is determined;

[0038] Insert the built-in high-strength steel into the rebar connection module;

[0039] Install a first stainless steel pipe at the other end of the rebar connection module, and contact the first rebar positioning anchor plate with the first inner anti-slip positioning key to determine the position of the first stainless steel pipe;

[0040] In step S5, the components of the outer hoop connection module are installed outside the connection between the first stainless steel tube and the second stainless steel tube, and two adjacent longitudinal stiffening plates connecting the two adjacent components are fixed with bolts.

[0041] The beneficial effects of the present invention are:

[0042] (1) In the variable-section composite stainless steel tube concrete composite column of the present application, the first stainless steel tube and the second stainless steel tube are square tubes or cylindrical tubes with different cross-sectional dimensions, so that the weight of the upper part of the variable-section stainless steel tube concrete composite column is reduced;

[0043] (2) The inner side of the longitudinal stiffening plate of the outer hoop connection module in contact with the first stainless steel tube and the second stainless steel tube is stepped, adapted to the outer diameter of the first stainless steel tube and the second stainless steel tube; at the same time, the outer side of the longitudinal stiffening plate is a side along the vertical direction, so that the outer diameters of the connection between the first stainless steel tube and the second stainless steel tube are aligned;

[0044] (3) The connection between the first stainless steel tube and the second stainless steel tube is wrapped with an annular stiffening rib, and together with the longitudinal stiffening plate, the first stainless steel tube and the second stainless steel tube are connected together from the outside to improve the bending bearing capacity and seismic performance of the connection;

[0045] (4) The present application uses stainless steel pipes, which have good corrosion resistance and can better adapt to the environmental characteristics of frequent freeze-thaw cycles and high corrosion under harsh geological and climatic conditions;

[0046] (5) The anchor bar connection module in the present application is placed inside the connection between the first stainless steel pipe and the second stainless steel pipe, and realizes the concrete column connection between the first stainless steel pipe and the second stainless steel pipe inside, thereby enhancing the strength of the connection between the first stainless steel pipe and the second stainless steel pipe from the inside of the steel pipe;

[0047] (6) The rebar connection module is fixed with bolts, avoiding quality defects caused by welding;

[0048] (7) The anchor bar connection module in this application uses an internal anti-slip positioning key for installation and positioning, and the external hoop connection module uses an external anti-slip positioning key for positioning, which speeds up the construction progress and improves time efficiency;

[0049] (8) Since high-strength steel sections are passed through the first stainless steel tube and the second stainless steel tube, after concrete is poured into the first stainless steel tube and the second stainless steel tube, the high-strength steel sections are built into the stainless steel tube concrete column, and the cross-sectional structure of the steel sections enhances the restraint effect on the concrete, thereby improving the bearing capacity and seismic performance of the composite column.

[0050] In summary, the present application is applicable to bridge piers, and is particularly applicable to bridge piers of super-high and super-long bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is an overall schematic diagram of a square column-shaped variable-section composite column according to Example 1 of the present invention;

[0052] Figure 2 This is a schematic diagram of the structural decomposition of a square column-shaped composite column with variable cross-section according to Example 1 of the present invention;

[0053] Figure 3 1 is a top view of a square column-shaped composite column with variable cross-section according to embodiment 1 of the present invention;

[0054] Figure 4 This is a schematic structural diagram of the first stainless steel tube in the square column-shaped variable-section composite column according to Example 1 of the present invention;

[0055] Figure 5 This is a schematic structural diagram of the second stainless steel tube in the square column-shaped variable-section composite column according to Example 1 of the present invention;

[0056] Figure 6 This is a schematic diagram of the structure of the high-strength steel section embedded in the square column-shaped variable-section composite column according to Example 1 of the present invention;

[0057] Figure 7 This is an overall schematic diagram of the rebar-embedded connection module in a square column-shaped variable-section composite column according to Example 1 of the present invention;

[0058] Figure 8 This is a schematic diagram of the structure decomposition of the outer hoop connection module in the square column-shaped variable-section composite column of Example 1 of the present invention;

[0059] FIG9( a ) is a schematic diagram of the installation of the first stainless steel pipe and the second stainless steel pipe according to Example 1 of the present invention;

[0060] FIG9( b ) is a schematic diagram of the installation of the first component and the second component of Example 1 of the present invention;

[0061] FIG9( c ) is a schematic diagram of the installation of the rebar connection module according to Example 1 of the present invention;

[0062] FIG9( d ) is a schematic diagram of the installation of the rebar connection module inserted into the second stainless steel pipe according to Example 1 of the present invention;

[0063] FIG9( e ) is a schematic diagram of the installation of a built-in high-strength steel bar insertion connection module according to Example 1 of the present invention;

[0064] FIG9( f ) is a schematic diagram of the installation of the rebar connection module inserted into the first stainless steel pipe according to Example 1 of the present invention;

[0065] FIG9( g ) is a schematic diagram of the installation of the outer hoop connection module according to Example 1 of the present invention;

[0066] FIG9(h) is a schematic diagram of pouring concrete according to Example 1 of the present invention;

[0067] Figure 10 is a schematic diagram of the overall structure of the cylindrical variable cross-section composite column of embodiment 2 of the present application;

[0068] Figure 11 is a schematic diagram of the structure of the cylindrical variable cross-section composite column of embodiment 2 of the present application;

[0069] Figure 12 is a schematic diagram of the structure of the steel bar planting connecting module in the cylindrical variable cross-section composite column of embodiment 2 of the present application;

[0070] Figure 13 is a schematic diagram of the structure of the external hoop connecting module in the cylindrical variable cross-section composite column of embodiment 2 of the present application.

[0071] wherein 1, first stainless steel pipe; 2, second stainless steel pipe; =5, inner filled concrete; 6, steel bar planting connecting module; 7, first steel bar positioning anchor plate; 8, second steel bar positioning anchor plate; 9, steel bar planting fixing bolt; 10, high-strength steel bar; 11, first inner anti-slip positioning key; 12, second inner anti-slip positioning key; 13, high-strength steel; 14, T-shaped high-strength steel; 15, external hoop connecting module; 16, longitudinal stiffening plate; 17, circumferential stiffening rib; 18, first component; 19, second component; 20, first outer anti-slip positioning key; 21, second outer anti-slip positioning key. DETAILED DESCRIPTION

[0072] The present application will be further described below with reference to the accompanying drawings.

[0073] Embodiment 1

[0074] As shown in the drawings, Figure 1-3 A square cylindrical variable cross-section composite stainless steel pipe concrete column according to the present application comprises a first stainless steel pipe 1 and a second stainless steel pipe 2, both of which are square cylindrical stainless steel pipes, the first stainless steel pipe 1 is located above the second stainless steel pipe 2, and the cross-sectional size of the second stainless steel pipe 2 is larger than that of the first stainless steel pipe 1.

[0075] A steel bar planting connecting module 6 is arranged inside the connection between the first stainless steel pipe 1 and the second stainless steel pipe 2, and both the first stainless steel pipe 1 and the second stainless steel pipe 2 are filled with concrete 5. Through the steel bar planting connecting module, the connection between the first stainless steel pipe and the second stainless steel pipe concrete column is realized inside, and the strength of the connection between the first and second stainless steel pipes is enhanced from the inside of the steel pipes.

[0076] An external hoop connecting module 15 is arranged outside the connection between the first stainless steel pipe 1 and the second stainless steel pipe 2. Through the external hoop connecting module, the first stainless steel pipe 1 and the second stainless steel pipe 2 are connected together from the outside, improving the bending capacity and seismic performance of the connection.

[0077] As shown in Figure 2 and Figure 4 , the inner surface of the first stainless steel pipe 1 is welded with a first inner anti-skid positioning key 11. Since the stainless steel pipe in this embodiment is a square pipe, the four inner walls of the first stainless steel pipe 1 are respectively fixed with the first inner anti-skid positioning key 11.

[0078] The outer surface of the first stainless steel pipe 1 is welded with a first outer anti-skid positioning key 20. Since the stainless steel pipe in this embodiment is a square pipe, the four outer walls of the first stainless steel pipe 1 are respectively fixed with the first outer anti-skid positioning key 20.

[0079] As shown in Figure 2 and Figure 5 , the inner surface of the second stainless steel pipe 2 is welded with a second inner anti-skid positioning key 12. Since the stainless steel pipe in this embodiment is a square pipe, the four inner walls of the second stainless steel pipe 2 are respectively fixed with the second inner anti-skid positioning key 12.

[0080] The outer surface of the second stainless steel pipe 2 is welded with a second outer anti-skid positioning key 21. Since the stainless steel pipe in this embodiment is a square pipe, the four outer walls of the second stainless steel pipe 2 are respectively fixed with the second outer anti-skid positioning key 21.

[0081] The first inner anti-skid positioning key 11 and the second inner anti-skid positioning key 12 are used to position the position of the steel bar connecting module 6 in the first stainless steel pipe 1 and the second stainless steel pipe 2.

[0082] The first outer anti-skid positioning key 20 and the second outer anti-skid positioning key 21 are used to position the outer hoop connecting module 15, so as to improve the installation speed and accuracy.

[0083] As shown in Figure 2 , a high-strength steel 13 is penetrated in the first stainless steel pipe 1 and the second stainless steel pipe 2. As shown in Figure 6 , the high-strength steel 13 is welded by four T-shaped high-strength steels 14, and the high-strength steel 13 can be pre-welded in the factory. As described above, the first stainless steel pipe 1 and the second stainless steel pipe 2 are also filled with concrete, and the constraint of the high-strength steel by the concrete can avoid the buckling of the steel; at the same time, the cross-sectional structure of the steel can constrain the concrete, so as to improve the bearing capacity and seismic performance of the column.

[0084] As shown in Figure 7 , the steel bar connecting module 6 includes a first steel bar positioning anchor plate 7 and a second steel bar positioning anchor plate 8, the first steel bar positioning anchor plate 7 is located in the pipe of the first stainless steel pipe 1, the second steel bar positioning anchor plate 8 is located in the pipe of the second stainless steel pipe 2, and the size of the first steel bar positioning anchor plate 7 is smaller than that of the second steel bar positioning anchor plate 8.

[0085] Since the first stainless steel tube 1 and the second stainless steel tube 2 are both square tubes, the first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 are correspondingly square plates. The centers of the first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 are both provided with square holes to facilitate the vertical penetration of the high-strength steel 13.

[0086] The first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 are fixedly connected by a plurality of high-strength steel bars 10. In this embodiment, the first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 are respectively provided with steel bar reserved holes, the upper ends of the high-strength steel bars 10 are inserted into the steel bar reserved holes of the first steel bar positioning anchor plate 7, and the lower ends of the high-strength steel bars 10 are inserted into the steel bar reserved holes of the second steel bar positioning anchor plate 8, and the upper and lower ends of the high-strength steel bars 10 are respectively fixed by steel bar fixing bolts 9, thereby forming a steel bar planting connection module 6.

[0087] The anchoring module connects the first and second stainless steel pipes to the concrete column internally, strengthening the connection from within the pipes. Bolting the anchoring module securely with bolts avoids quality defects associated with welding.

[0088] During construction, the first stainless steel pipe and the rebar connection module 6 are positioned by contact between the first inner anti-slip positioning key 11 and the first rebar positioning anchor plate 7; and the second stainless steel pipe and the rebar connection module 6 are positioned by contact between the second outer anti-slip positioning key 21 and the second rebar positioning anchor plate 8. This installation method can greatly speed up construction progress and improve construction efficiency.

[0089] like Figure 8 As shown, the outer hoop connection module 15 includes several longitudinal stiffening plates 16 and several circumferential stiffening ribs 17. The longitudinal stiffening plates 16 are arranged axially along the first and second stainless steel tubes and are spaced apart circumferentially along the first and second stainless steel tubes. The longitudinal stiffening plates 16 conform to the outer walls of the first and second stainless steel tubes. The edges of the longitudinal stiffening plates 16 that conform to the outer walls of the first and second stainless steel tubes are stepped to match the outer diameters of the first and second stainless steel tubes.

[0090] Circumferential stiffening ribs 17 are provided along the circumference of the first and second stainless steel tubes. Circumferential stiffening ribs 17 are located between adjacent longitudinal stiffening plates 16, and the adjacent longitudinal stiffening plates 16 are fixedly connected by the circumferential stiffening ribs 17. In this embodiment, a group of circumferential stiffening ribs is provided along the same circumference of the first and second stainless steel tubes, with each group comprising several circumferential stiffening ribs 17. Multiple groups of circumferential stiffening ribs are provided axially between the first and second stainless steel tubes at intervals.

[0091] In the embodiment, the inner side of the hoop stiffener 17 towards the first and second stainless steel pipes is a flat surface or a right-angled surface that is attached to the outer wall of the steel pipe, and the outer side of the hoop stiffener 17 is an arc-shaped surface, so that the overall shape of the outer hoop connecting module 15 is cylindrical.

[0092] The components in the outer hoop connecting module 15 embrace the outer periphery of the first and second stainless steel pipes, greatly improving the bending resistance of the connection between the first and second stainless steel pipes.

[0093] The outer hoop connecting module 15 in the embodiment includes a first component 18 and a second component 19, the first component 18 includes a plurality of longitudinal stiffening plates 16 and a plurality of hoop stiffeners 17, and the second component includes a plurality of longitudinal stiffening plates 16 and a plurality of hoop stiffeners 17. Holes are provided on the adjacent longitudinal stiffening plates 16 between the first component 18 and the second component 19. Bolts pass through the holes on the adjacent two longitudinal stiffening plates 16 of the first component 18 and the second component 19 in sequence, so that the first component 18 and the second component 19 embrace the outer periphery of the first and second stainless steel pipes.

[0094] In the factory, the hoop stiffeners 17 are welded with the longitudinal stiffening plates 16 to form the first component 18 and the second component 19 of the outer hoop connecting module 15. The adjacent two longitudinal stiffening plates 16 of the first component 18 and the second component 19 align the first and second stainless steel pipes from the outside, and together with the hoop stiffeners 17, the first and second stainless steel pipes are connected from the outside.

[0095] The outer hoop connecting module 15 is arranged between the first outer anti-skid positioning key 20 and the second outer anti-skid positioning key 21, and the positioning of the outer hoop connecting module is realized through the first outer anti-skid positioning key and the second outer anti-skid positioning key. The outer hoop connecting module 15 is fastened to the outside of the first and second stainless steel pipes through the bolt connection between the first component 18 and the second component 19.

[0096] The first stainless steel pipe 1, the second stainless steel pipe 2, the high-strength steel 13, the anchor rod connecting module 6, the first component 18 and the second component 19 of the outer hoop connecting module 15 are all prefabricated in the factory in advance, and only need to be assembled and then poured with concrete on site.

[0097] The installation method of the variable cross-section composite stainless steel pipe concrete composite column includes the following installation steps, as shown in Figure 9(a) to Figure 9(h)

[0098] ​Step 1: As shown in Figure 9(a), a first stainless steel tube 1 and a second stainless steel tube 2 are fabricated. The cross-sectional dimensions of the second stainless steel tube 2 are larger than those of the first stainless steel tube 1. A first inner anti-slip locating key 11 is welded to the inner surface of the first stainless steel tube 1, and a first outer anti-slip locating key 20 is welded to the outer surface of the first stainless steel tube 1. A second inner anti-slip locating key 12 is welded to the inner surface of the second stainless steel tube 2, and a second outer anti-slip locating key 21 is welded to the outer surface of the second stainless steel tube 2.

[0099] Step 2: As shown in FIG9( b ), longitudinal stiffening plates 16 and annular stiffening ribs 17 are manufactured. The sides of the longitudinal stiffening plates 16 facing the first and second stainless steel tubes are stepped and adapted to the outer diameters of the first and second stainless steel tubes 1 and 2 .

[0100] The longitudinal stiffening plates 16 and the annular stiffening ribs 17 are welded together to form a first component 18 and a second component 19 of the outer hoop connection module.

[0101] Step 3: As shown in Figure 9(c), high-strength steel bars 10 are inserted into the steel bar reserved holes of the first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 in sequence, and the high-strength steel bars are fixed by the steel bar fixing bolts 9 to build the steel bar connection module 6.

[0102] Step 4: As shown in Figure 9(d), insert the second steel bar positioning anchor plate 8 at one end of the rebar connection module 6 into the second stainless steel tube 2. The second steel bar positioning anchor plate 8 contacts the second inner anti-slip positioning key 12 in the second stainless steel tube 2 to determine the position of the rebar connection module 6 in the second stainless steel tube 2.

[0103] Step 5: As shown in FIG9( e ), the high-strength steel 13 is inserted into the rebar connection module 6 .

[0104] Step 6: As shown in Figure 9(f), the first stainless steel tube 1 is installed at the other end of the rebar connection module 6, and the first rebar positioning anchor plate 7 contacts the first anti-slip positioning key 11 in the first stainless steel tube 1 to determine the position of the first stainless steel tube 1.

[0105] Step 7: As shown in FIG9(g), according to the positions of the first outer anti-slip positioning key 20 and the second outer anti-slip positioning key 21, the outer hoop connecting module 15 is placed outside the first stainless steel tube 1 and the second stainless steel tube 2. The outer hoop connecting module 15 is located between the first outer anti-slip positioning key 20 and the second outer anti-slip positioning key 21. Tighten the connecting bolts between the first part 18 and the second part 19 of the outer hoop connecting module 15.

[0106] Step 8: As shown in FIG9(h), concrete 5 is poured into the interior through the opening of the first stainless steel tube 1. At this point, the variable-section composite stainless steel tube concrete composite column described in this application is installed.

[0107] Example 2

[0108] Different from Example 1, the first stainless steel tube and the second stainless steel tube in this embodiment are both cylindrical. Figures 10 to 13 shown.

[0109] The first and second stainless steel tubes 1 and 2 have circular cross-sections. Several first inner anti-slip locating keys 11 are fixed at intervals on the circular inner wall of the first stainless steel tube 1, and several first outer anti-slip locating keys 20 are fixed at intervals on the circular outer surface of the first stainless steel tube 1. Several second inner anti-slip locating keys 12 are fixed at intervals on the circular inner wall of the second stainless steel tube 2, and several second outer anti-slip locating keys 21 are fixed at intervals on the circular outer surface of the second stainless steel tube 2.

[0110] The first steel bar positioning anchor plate 7 and the second steel bar positioning anchor plate 8 of the rebar planting connection module 6 are both circular plates, and a central hole for high-strength steel to pass through is provided in the center of the circular plate.

[0111] The shape of the corresponding annular stiffening ribs 17 of the outer hoop connection module 15 also changes: the inner side surfaces of the annular stiffening ribs 17 facing the first stainless steel pipe and the second stainless steel pipe are arc-shaped surfaces that fit the outer walls of the steel pipes.

[0112] Other details are the same as in Example 1.

[0113] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A composite column of variable cross-section composite stainless steel tube concrete, characterized in that: It comprises a first stainless steel tube (1) and a second stainless steel tube (2), wherein the cross-sectional dimension of the second stainless steel tube (2) is larger than the cross-sectional dimension of the first stainless steel tube (1); The interiors of the first stainless steel pipe (1) and the second stainless steel pipe (2) are connected via a rebar planting connection module (6), the exteriors of the first stainless steel pipe (1) and the second stainless steel pipe (2) are connected via an outer hoop connection module (15), and the interiors of the second stainless steel pipe (2) and the first stainless steel pipe (1) are filled with concrete (5).

2. The variable-section composite stainless steel tube concrete composite column according to claim 1, characterized in that: The first stainless steel tube (1) and the second stainless steel tube (2) are cylindrical stainless steel tubes or square stainless steel tubes.

3. The variable-section composite stainless steel tube concrete composite column according to claim 1, characterized in that: The rebar planting connection module (6) comprises: A first steel bar positioning anchor plate (7) is inserted into the first stainless steel tube (1); A second steel bar positioning anchor plate (8) is inserted into the second stainless steel tube (2); The high-strength steel bar (10) and the first steel bar positioning anchor plate and the second steel bar positioning anchor plate are both provided with connection holes, and the two ends of the high-strength steel bar (10) are respectively inserted into the connection holes of the first steel bar positioning anchor plate (7) and the second steel bar positioning anchor plate (8), and are fixed by the embedded steel bar fixing bolts (9).

4. The variable-section composite stainless steel tube concrete composite column according to claim 3, characterized in that: A plurality of first inner anti-slip positioning keys (11) are fixed to the inner wall of the first stainless steel pipe (1), and a plurality of first outer anti-slip inner positioning keys are located on the same circumferential surface, for locating the position of the first steel bar positioning anchor plate in the first stainless steel pipe; Several second inner anti-slip positioning keys (12) are fixed inside the second stainless steel pipe (2), and the several second inner anti-slip positioning keys are located on the same circumferential surface and are used to locate the position of the second steel bar positioning anchor plate inside the second stainless steel pipe.

5. The variable-section composite stainless steel tube concrete composite column according to claim 1, characterized in that: The outer hoop connection module (15) comprises, A longitudinal stiffening plate (16) is arranged along the axial direction of the first stainless steel tube and the second stainless steel tube, and a plurality of longitudinal stiffening plates are arranged at intervals along the circumference of the first stainless steel tube and the second stainless steel tube, and the longitudinal stiffening plates are stepped toward the sides of the first stainless steel tube and the second stainless steel tube, so as to fit the outer surfaces of the first stainless steel tube and the second stainless steel tube; Circumferential stiffening ribs (17) are provided with a plurality of circular stiffening ribs spaced along the axial direction of the first stainless steel tube and the second stainless steel tube, each group of circular stiffening ribs includes a plurality of circular stiffening ribs located on the same circumferential surface of the first stainless steel tube and the second stainless steel tube, and the circular stiffening ribs connect two adjacent longitudinal stiffening plates.

6. The variable-section composite stainless steel tube concrete composite column according to claim 5, characterized in that: The outer hoop connection module (15) comprises at least two parts, each of which comprises a longitudinal stiffening plate and an annular stiffening rib; The adjacent longitudinal stiffening plates of the adjacent parts are fixedly connected by bolts, so that the parts surround the outer periphery of the first stainless steel tube and the second stainless steel tube.

7. The variable-section composite stainless steel tube concrete-filled composite column according to claim 5, characterized in that: A plurality of first external anti-slip positioning keys (20) are fixed to the outer wall of the first stainless steel tube (1), and the plurality of first external anti-slip positioning keys are located on the same circumferential surface of the first stainless steel tube; A plurality of second outer anti-slip positioning keys (21) are fixed to the outer wall of the second stainless steel tube (2), and the plurality of second outer anti-slip positioning keys are located on the same circumferential surface of the second stainless steel tube; The outer hoop connection module is located between the first outer anti-slip positioning key and the second outer anti-slip positioning key, thereby positioning the outer hoop connection module outside the first stainless steel tube and the second stainless steel tube.

8. The variable-section composite stainless steel tube concrete-filled composite column according to claim 1, characterized in that: The interior of the rebar-planting connection module (6) is provided with built-in high-strength steel, and the high-strength steel is arranged to penetrate the first stainless steel pipe and the second stainless steel pipe.

9. A method for installing a variable-section composite stainless steel tube concrete-filled composite column according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, manufacturing a first stainless steel tube (1) and a second stainless steel tube (2); S2, manufacturing an outer hoop connection module (15), so that the inner surface of the outer hoop connection module (15) is in contact with the outer surfaces of the first stainless steel tube (1) and the second stainless steel tube (2); S3, building a rebar connection module (6); S4, inserting the rebar-planting connection module (6) into the first stainless steel tube (1) and the second stainless steel tube (2) respectively, so that the rebar-planting connection module is located inside the connection between the first stainless steel tube and the second stainless steel tube; S5, installing an outer hoop connection module (15) outside the connection between the first stainless steel tube (1) and the second stainless steel tube (2); S6. Pour concrete (5) into the interior of the first stainless steel tube and the second stainless steel tube through the opening of the first stainless steel tube (1).

10. The installation method according to claim 9, characterized in that: In step S1, inner anti-slip positioning keys are welded and fixed inside the first stainless steel tube and the second stainless steel tube, and outer anti-slip positioning keys are welded and fixed outside the first stainless steel tube and the second stainless steel tube; In step S2, a longitudinal stiffening plate (16) and an annular stiffening rib (17) are manufactured, wherein the longitudinal stiffening plate (16) is stepped toward the side of the first stainless steel tube and the second stainless steel tube, and is adapted to the outer diameter of the first stainless steel tube and the second stainless steel tube; the longitudinal stiffening plate (16) and the annular stiffening rib (17) are welded and fixedly connected; In step S3, high-strength steel bars (10) are sequentially inserted into the steel bar reserved holes of the first steel bar positioning anchor plate (7) and the second steel bar positioning anchor plate (8), and fixed by anchor bolts (9); In step S4, the rebar planting connection module (6) is inserted into the second stainless steel pipe (2), and the second rebar positioning anchor plate (8) contacts the second inner anti-slip positioning key (12) to determine the position of the rebar planting connection module (6) in the second stainless steel pipe (2); Inserting the built-in high-strength steel (13) into the rebar connection module (6); A first stainless steel pipe (1) is installed at the other end of the rebar planting connection module (6), and a first rebar positioning anchor plate (7) contacts a first inner anti-slip positioning key (11) to determine the position of the first stainless steel pipe (1); In step S5, the components of the outer hoop connection module (15) are installed outside the connection between the first stainless steel tube (1) and the second stainless steel tube (2), and two adjacent longitudinal stiffening plates (16) connecting the two adjacent components are fixedly connected with bolts.

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