A column base joint of a steel pipe supported by a large-span steel reinforced concrete transfer beam and a construction method thereof

Abstract

The present invention relates to a column foot node of a steel pipe supported by a large-span steel-concrete transfer beam and a construction method, which includes a cross-shaped intersection section of primary and secondary beam steel sections, a lower section of a steel pipe column welded to the top of the intersection section, stiffening plates distributed along the inner and outer walls of the steel pipe column, and connection structures. The cross-shaped extended end faces of the primary and secondary beam steel sections are welded to the steel sections inside the large-span steel-concrete beam and slab structure. The lower section of the steel pipe column forms a linear force transmission path with the intersection section through axis alignment welding. The wedge-shaped vertical stiffening plates on the outside of the steel pipe decompose the force of the steel pipe column and introduce it into the surrounding transfer beam, effectively improving the flexural strength of the column foot node; the rectangular vertical stiffening plates on the inside of the steel pipe are cross-welded to the inner wall of the column to evenly disperse the internal stress. The rectangular and arc-shaped vertical stiffening plates in the intersection section are nested and welded to form a multi-directional rigid structure. The node establishes a multi-channel force transmission system through the spatial layout of the stiffening plates, avoiding stress concentration and enhancing the overall stiffness. This node is applicable to large-span transfer layer structures.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and in particular to a column foot node of a steel pipe supported by a large-span steel reinforced concrete transfer beam and a construction method thereof. Background Art

[0002] In large underground space projects, traditional column foot nodes of steel reinforced concrete transfer beams and columns generally have problems such as unclear force transmission paths and significant stress concentration. Most existing nodes adopt the layout of planar stiffeners, resulting in uneven distribution of node stiffness and difficulty in meeting the complex stress requirements of large-span transfer structures. During welding construction, the operating space is limited in the area where stiffeners are dense, and weld defects are likely to occur; during the concrete pouring process, cavities are easily formed in the core area of the node due to the blockage of stiffeners, affecting the compactness. In addition, the conventional diaphragm structure has insufficient restraint on the steel pipe wall and is prone to local buckling under dynamic loads, making it difficult to meet the rigid requirements of the column foot nodes of the integrated above-ground and underground structures. Although there are individual solutions that attempt to optimize the layout of stiffeners, a multi-directional collaborative force transmission system has not been formed, and there is a lack of adaptation design with the concrete pouring process, resulting in unstable construction quality and restricting engineering applications. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a column foot node of a steel pipe supported by a large-span steel reinforced concrete transfer beam and a construction method thereof.

[0004] In a first aspect, the present invention provides a column foot node of a steel pipe supported by a large-span steel reinforced concrete transfer beam, including a combined column foot node of a cross shape plus an arc shape, and the combined column foot node of a cross shape plus an arc shape includes:

[0005] The intersection section of primary and secondary beam steel sections distributed in a cross shape;

[0006] The lower section of the steel pipe column welded to the top of the central axis of the intersection section of the primary and secondary beam steel sections;

[0007] The wedge-shaped vertical stiffeners welded to the outer wall of the lower section of the steel pipe column and the outer side of the steel pipe of the intersection section of the primary and secondary beam steel sections along the central axis direction of the intersection section of the primary and secondary beam steel sections;

[0008] The rectangular vertical stiffeners welded to the inner wall of the lower section of the steel pipe column and the inner side of the steel pipe of the intersection section of the primary and secondary beam steel sections in a cross shape along the central axis direction of the intersection section of the primary and secondary beam steel sections, and the intersection point is located on the central axis of the lower section of the steel pipe column;

[0009] The rectangular vertical stiffeners welded to the intersection section of the primary and secondary beam steel sections along the direction between adjacent central axes of the intersection section of the primary and secondary beam steel sections;

[0010] The arc-shaped vertical stiffeners welded between the intersection section of the primary and secondary beam steel sections and the rectangular vertical stiffeners of the intersection section and corresponding to the wall plate position of the lower section of the steel pipe column;

[0011] The steel pipe column structure is welded to the top of the lower section of the steel pipe column, and their central axes coincide.

[0012] The internal steel shapes of the long-span steel reinforced concrete beam and slab structure are welded to the cross-shaped extended end faces of the intersection section of the main and secondary beam steel shapes.

[0013] Optionally, it further includes:

[0014] The steel pipe inner side wedge-shaped vertical stiffening plates welded to the inner wall of the lower section of the steel pipe column and the inner side of the steel pipes at the intersection section of the main and secondary beam steel shapes. The steel pipe inner side wedge-shaped vertical stiffening plates are located between the steel pipe inner side rectangular vertical stiffening plates in a cross shape, and correspond to the intersection section rectangular vertical stiffening plates.

[0015] Optionally, the intersection section of the main and secondary beam steel shapes includes a top flange of the intersection section, a web of the intersection section, and a bottom flange of the intersection section that are sequentially distributed along the central axis direction of the lower section of the steel pipe column;

[0016] Studs are arranged in an array on the outer wall of the lower section of the steel pipe column, the outer wall of the top flange of the intersection section, the outer wall of the bottom flange of the intersection section, and the outer wall of the intersection section rectangular vertical stiffening plates.

[0017] Optionally,

[0018] The outer wall of the lower section of the steel pipe column is welded with an outer steel pipe circular diaphragm. The outer steel pipe circular diaphragm includes an upper outer steel pipe circular diaphragm located at the elevation of the top surface of the concrete pier and a lower outer steel pipe circular diaphragm located at the elevation of the center of the upper longitudinal reinforcement of the steel reinforced concrete beam.

[0019] Optionally,

[0020] The inner wall of the lower section of the steel pipe column is welded with an inner steel pipe circular diaphragm. The inner steel pipe circular diaphragm includes an upper inner steel pipe circular diaphragm coplanar with the upper outer steel pipe circular diaphragm and a lower inner steel pipe circular diaphragm coplanar with the lower outer steel pipe circular diaphragm. The upper inner steel pipe circular diaphragm and the lower inner steel pipe circular diaphragm are respectively welded and connected to the inner steel pipe rectangular vertical stiffening plates, the inner steel pipe wedge-shaped vertical stiffening plates, and the inner wall of the lower section of the steel pipe column.

[0021] Optionally:

[0022] The longitudinal steel bars of the steel pipe column are bent at 90° at the bottom and welded to the upper surface of the top flange of the intersection section, and the upper part of the steel bars is continued through a mechanical connection sleeve at the top;

[0023] The circular stirrups of the steel pipe column are bent at both ends to form L-shaped ends, and the L-shaped ends are welded and fixed to the sides of the inner steel pipe rectangular vertical stiffening plates and the sides of the inner steel pipe wedge-shaped vertical stiffening plates.

[0024] In a second aspect, the present invention also provides a construction method for a column base joint as described in any one of the first aspects, including:

[0025] S1. Pre-fabricate main beam steel sections, secondary beam steel sections, the intersection section of main and secondary beam steel sections, and the lower section of the steel pipe column in the factory;

[0026] S2. Assemble and weld the intersection section of main and secondary beam steel sections and the lower section of the steel pipe column in the factory, and fabricate and weld the rectangular vertical stiffening plates, arc-shaped vertical stiffening plates, wedge-shaped vertical stiffening plates on the outer side of the steel pipe, rectangular vertical stiffening plates on the inner side of the steel pipe, wedge-shaped vertical stiffening plates on the inner side of the steel pipe, annular diaphragms on the outer side of the steel pipe, annular diaphragms on the inner side of the steel pipe, and stud welds to form a preliminary steel column base;

[0027] S3. Position and install the preliminary steel column base, main beam steel sections, and secondary beam steel sections on-site;

[0028] S4. Set up formwork, bind steel bars, and pour concrete on-site to form a cast-in-place column base joint;

[0029] S5. Position and weld the upper section of the steel pipe column on-site, continue the steel bars at the top of the longitudinal steel bars of the steel pipe column, and pour the concrete inside the steel pipe to complete the installation of the steel pipe column structure.

[0030] The embodiments of the present invention have the following technical effects:

[0031] By setting up a vertically distributed vertical stiffening plate and annular diaphragm structure with multi-directional distribution in the cross-shaped plus arc-shaped combined column base joint, the present invention forms a spatial three-dimensional force transmission system. The cross-shaped and diagonal layout of the cross-shaped distributed stiffening plates can evenly disperse the loads in different directions of the steel pipe column to the core area of the column base joint, avoiding stress concentration. The inner and outer annular diaphragms of the steel pipe form double rigid constraints at the key height positions, effectively improving the overall stiffness of the joint area and suppressing the deformation of the steel pipe column wall. The combination of the wedge-shaped structure of the inner stiffening plate of the steel pipe and the reserved operation space ensures the operability and welding quality of the welding construction. The bending and welding design of the longitudinal steel bars, annular stirrups, and stiffening plates of the steel pipe column realizes a force transmission mechanism combining rigidity and flexibility, promoting the collaborative work of the steel pipe and concrete. The matrix distribution of the stud welds and the welding and fixing structure of the stirrups further strengthen the integrity of the composite structure, enhancing the seismic performance while improving the bearing capacity of the joint, and ensuring the safety and durability of the structure under complex load conditions. Description of the Drawings

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Structural schematic diagram of the cast-in-place rigid column base joint in the present invention;

[0034] Figure 2 Schematic diagram of the internal steel shapes of the column base joint in the present invention;

[0035] Figure 3 Schematic diagram of the composition of the inner and outer steel plate parts of the lower section of the steel pipe column in the present invention;

[0036] Figure 4 Schematic diagram of the composition of the inner and outer steel plate parts of the intersection section of the primary and secondary beam steel shapes in the present invention;

[0037] Figure 5 Elevation view of the internal steel shapes of the column base joint in the present invention;

[0038] Figure 6 For Figure 5 Cross-sectional view A-A in

[0039] Figure 7 For Figure 5 Cross-sectional view B-B in

[0040] Figure 8 For Figure 5 Cross-sectional view C-C in

[0041] Figure 9 Schematic diagram of the arrangement of the upper longitudinal reinforcement of the steel reinforced concrete beam in the present invention;

[0042] Figure 10 Schematic diagram of the connection of the upper longitudinal reinforcement of the steel reinforced concrete beam, pier reinforcement and the outer ring diaphragm of the steel pipe in the present invention;

[0043] Figure 11 Schematic diagram of the arrangement of the longitudinal reinforcement and circular stirrups of the steel pipe column in the present invention.

[0044] Reference numerals

[0045] 1. Steel pipe column structure; 101. Upper section of steel pipe column; 102. Concrete inside the pipe; 2. Cross-shaped and arc-shaped combined column foot node; 201. Lower section of steel pipe column; 202. Wedge-shaped vertical stiffening plate on the outside of the steel pipe; 203. Rectangular vertical stiffening plate on the inside of the steel pipe; 204. Wedge-shaped vertical stiffening plate on the inside of the steel pipe; 205. Ring-shaped transverse diaphragm on the outside of the steel pipe; 2051. Upper ring-shaped transverse diaphragm on the outside of the steel pipe; 2052. Lower ring-shaped transverse diaphragm on the outside of the steel pipe; 206. Ring-shaped transverse diaphragm on the inside of the steel pipe; 2061. Upper ring-shaped transverse diaphragm on the inside of the steel pipe; 2062. Lower ring-shaped transverse diaphragm on the inside of the steel pipe; 207. Intersection section of main and secondary beam steel sections; 2071. Web of the intersection section; 2072. Top flange of the intersection section; 2073. Bottom flange of the intersection section; 208. Rectangular vertical stiffening plate of the intersection section; 209. Arc-shaped vertical stiffening plate of the intersection section; 210. Stud welding nail; 211. Longitudinal steel bars of the steel pipe column; 212. Circular stirrups of the steel pipe column; 213. Pier reinforcement; 214. Mechanical connection sleeve; 215. Concrete pier; 216. Upper longitudinal reinforcement of the steel reinforced concrete beam; 217. Square hole; 218. Fan-shaped pouring hole; 219. Circular overflow hole; 220. Oval hole; 221. End vertical stiffening plate of the intersection section; 3. Long-span steel reinforced concrete beam and slab structure; 301. Frame main beam; 302. Frame secondary beam; 303. Reinforced concrete slab; 304. Main beam steel section; 305. Secondary beam steel section; 4. Preliminary steel column foot. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0047] Figure 1-11 The following is a schematic diagram of a large-span steel reinforced concrete transfer beam supporting steel pipe column foot node structure provided by an embodiment of the present invention, including a cross-shaped and arc-shaped combined column foot node 2, and the cross-shaped and arc-shaped combined column foot node 2 includes:

[0048] The intersection section 207 of main and secondary beam steel sections distributed in a cross shape;

[0049] The lower section 201 of the steel pipe column welded to the top of the central axis of the intersection section 207 of the main and secondary beam steel sections;

[0050] The wedge-shaped vertical stiffening plate 202 on the outside of the steel pipe welded along the central axis direction of the intersection section 207 of the main and secondary beam steel sections to the outer wall of the lower section 201 of the steel pipe column and the intersection section 207 of the main and secondary beam steel sections;

[0051] It is welded in a cross shape along the central axis direction of the intersection section 207 of the main and secondary beam steel sections on the inner wall of the lower section 201 of the steel pipe column and on the inner side of the rectangular vertical stiffening plate 203 of the steel pipe at the intersection section 207 of the main and secondary beam steel sections, and the intersection point is located on the central axis of the lower section 201 of the steel pipe column;

[0052] It is welded along the direction between the adjacent central axes of the intersection section 207 of the main and secondary beam steel sections on the intersection section rectangular vertical stiffening plate 208 of the intersection section 207 of the main and secondary beam steel sections;

[0053] The intersection section arc-shaped vertical stiffening plate 209 is welded between the intersection section 207 of the main and secondary beam steel sections and the intersection section rectangular vertical stiffening plate 208 and corresponds to the position of the wall plate of the lower section 201 of the steel pipe column;

[0054] The steel pipe column structure 1 is welded to the top of the lower section 201 of the steel pipe column and their central axes coincide.

[0055] The internal steel of the long-span steel reinforced concrete beam and slab structure 3 is welded to the cross-shaped extended end face of the intersection section 207 of the main and secondary beam steel sections.

[0056] The core of this node structure lies in the spatial connection system between the intersection section 207 of the main and secondary beam steel sections and the lower section 201 of the steel pipe column. The intersection section 207 of the main and secondary beam steel sections is distributed in a cross shape, and its four extended end faces are respectively welded to the internal steel sections of the long-span steel reinforced concrete beam and slab structure 3 to form a complete transfer force system. The lower section 201 of the steel pipe column is vertically welded to the top of the central axis of the intersection section 207 of the main and secondary beam steel sections, and their axes coincide to ensure the vertical load is transmitted along a straight line. The wedge-shaped vertical stiffening plates 202 on the outer side of the steel pipe are distributed in a cross-radiating shape along the central axis direction of the intersection section 207 of the main and secondary beam steel sections on the outer wall of the lower section 201 of the steel pipe column. The rectangular vertical stiffening plates 203 on the inner side of the steel pipe are welded in a cross shape along the central axis direction of the intersection section 207 of the main and secondary beams on the inner wall of the lower section 201 of the steel pipe column, and the intersection point is located on the axis of the steel pipe column to form an internal and external rigid skeleton, evenly dispersing the upper load to the four extended directions of the intersection section 207 of the main and secondary beam steel sections, and then conducting it to the main and secondary beam steel sections. The wedge-shaped vertical stiffening plates 202 on the outer side of the steel pipe are provided with square holes 217. The rectangular vertical stiffening plate 208 of the intersection section is welded to the intersection section 207 of the main and secondary beam steel sections along the direction between the adjacent central axes of the intersection section 207 of the main and secondary beam steel sections, enhancing the shear resistance of the joint area through vertical welding. Except for this position, the extended end face of the intersection section 207 of the main and secondary beam steel sections is provided with the vertical stiffening plate 221 at the end of the intersection section, that is, it is arranged between this end face and the long-span steel reinforced concrete beam and slab structure 3. The arc-shaped vertical stiffening plate 209 of the intersection section is located at the corresponding position of the connection between the intersection section 207 of the main and secondary beam steel sections and the wall plate of the lower section 201 of the steel pipe column. Its outer arc surface matches the curvature of the outer wall of the lower section 201 of the steel pipe column, and forms a continuous and complete stress transfer interface by welding with the side of the rectangular vertical stiffening plate 208 of the intersection section. A long circular hole 220 is opened in the middle of the plate surface of the arc-shaped vertical stiffening plate 209 of the intersection section, and the length direction of the hole is consistent with the arc direction of the stiffening plate, and both ends are semi-circular chamfers. The long circular hole 220 forms an aggregate flow channel, which is beneficial to improving the concrete density. During concrete pouring, the vibrating rod can be inserted into the internal cavity area of the stiffening plate through the long circular hole 220 to assist in vibration, and at the same time, observe the overflow situation of the slurry in the hole to judge the density. The internal steel sections of the long-span steel reinforced concrete beam and slab structure 3 are connected to the extended ends of the intersection section 207 of the main and secondary beam steel sections through end face welding, realizing the continuous extension of the steel sections of the type conversion column foot node. After the upper section 101 of the steel pipe column is butt-welded to the top of the lower section 201 of the steel pipe column, the concrete 102 in the pipe is then poured, forming a complete force transfer system between the conversion column foot node and the upper structure. The long-span steel reinforced concrete beam and slab structure 3 is composed of the frame main beam 301, the frame secondary beam 302 and the reinforced concrete slab 303. The frame main beam 301 and the frame secondary beam 302 are butt-welded and fixed to the cross extended end faces of the intersection section 207 of the main and secondary beam steel sections.

[0057] In some embodiments, it further includes:

[0058] The wedge-shaped vertical stiffening plate 204 on the inner side of the steel pipe, which is welded to the inner wall of the lower section 201 of the steel pipe column and the inner side of the steel pipe at the intersection of the main and secondary beam steel sections 207, is located between the rectangular vertical stiffening plates 203 on the inner side of the steel pipes in a cross shape, and corresponds to the rectangular vertical stiffening plate 208 at the intersection section.

[0059] On the basis of the structure of the above embodiment, the top of the lower section 201 of the steel pipe column is open, and the wedge-shaped vertical stiffening plates 204 on the inner side of the steel pipe are symmetrically arranged between the rectangular vertical stiffening plates 203 on the inner side of the steel pipes in a cross shape on the inner wall of the lower section 201 of the steel pipe column. The wedge-shaped vertical stiffening plates 204 on the inner side of the steel pipe gradually expand vertically to form a force-transferring section with a gradient expansion. When the steel pipe column bears the load in the direction of the central axis of the non-main and secondary beam intersection section 207, the relevant load can be more directly transferred to the joint core area of the main and secondary beam steel section intersection section 207 through the wedge-shaped vertical stiffening plates 204 on the inner side of the steel pipe. This layout effectively alleviates the stress concentration problem of the traditional cross stiffening plate under the load in the non-corresponding direction. At the same time, the wedge-shaped structure of the stiffening plate is also beneficial to providing a welding space. When the diameter of the steel pipe column structure 1 is small, resulting in a tight welding space, the rectangular vertical stiffening plates 203 on the inner side of the steel pipe can also be adjusted to a wedge shape with reference to this idea.

[0060] In some embodiments, the main and secondary beam steel section intersection section 207 includes a top flange 2072 of the intersection section, a web 2071 of the intersection section, and a bottom flange 2073 of the intersection section, which are sequentially distributed along the central axis direction of the lower section 201 of the steel pipe column;

[0061] Cylindrical head studs 210 are distributed in an array on the outer wall of the lower section 201 of the steel pipe column, the outer wall of the top flange 2072 of the intersection section, the outer wall of the bottom flange 2073 of the intersection section, and the outer wall of the rectangular vertical stiffening plate 208 of the intersection section.

[0062] The main and secondary beam steel section intersection section 207 is composed of standard steel members. Its top flange 2072 of the intersection section and bottom flange 2073 of the intersection section are connected by the web 2071 of the intersection section to form an I-shaped cross-section. The full penetration groove welding is adopted at the cross intersection to ensure the cross-section stiffness. The cylindrical head studs 210 are evenly distributed in a rectangular array on the outer wall of the lower section 201 of the steel pipe column, the outer surface of the top flange 2072 of the intersection section, the outer surface of the bottom flange 2073 of the intersection section, and both sides of the rectangular vertical stiffening plate 208 of the intersection section. The arrangement direction of the studs is parallel to the extension direction of the main and secondary beam steel sections. During the concrete pouring stage, the cylindrical head studs 210 form a mechanical anchoring effect with the flowing concrete, restricting the relative slip between the surface of the steel section and the concrete. Especially under the action of dynamic loads, the cooperative work of the stud group can effectively dissipate energy.

[0063] In some embodiments,

[0064] On the outer wall of the lower section 201 of the steel pipe column, an outer-steel-pipe annular transverse diaphragm 205 is welded. The outer-steel-pipe annular transverse diaphragm 205 includes an upper outer-steel-pipe annular transverse diaphragm 2051 located at the elevation of the top surface of the concrete pier 215 and a lower outer-steel-pipe annular transverse diaphragm 2052 located at the elevation of the center of the upper longitudinal bars 216 of the steel-concrete beam. The upper outer-steel-pipe annular transverse diaphragm 2051 and the lower outer-steel-pipe annular transverse diaphragm 2052 are respectively welded to the outer-steel-pipe wedge-shaped vertical stiffening plate 202 and the outer wall of the lower section 201 of the steel pipe column.

[0065] The outer-steel-pipe annular transverse diaphragm 205 is composed of two upper and lower annular steel plates. The upper outer-steel-pipe annular transverse diaphragm 2051 is located at the elevation of the top surface of the concrete pier 215, and its outer edge extends outward to form an annular bearing plate. The inner ends of the pier steel bars 213 are welded to the upper outer-steel-pipe annular transverse diaphragm 2051, and the outer ends are anchored into the long-span steel-concrete beam and slab structure 3. The lower outer-steel-pipe annular transverse diaphragm 2052 is located at the elevation of the center of the upper longitudinal bars 216 of the steel-concrete beam, and its inner edge is welded to the outer wall of the lower section 201 of the steel pipe column and the outer-steel-pipe wedge-shaped vertical stiffening plate 202. When the beam-end moment is transferred to the joint area, the upper outer-steel-pipe annular transverse diaphragm 2051 converts part of the moment into pressure through the annular bearing surface and transfers it to the concrete pier 215, while the lower outer-steel-pipe annular transverse diaphragm 2052 realizes the continuous force transfer of the steel bars by connecting the upper longitudinal bars 216 of the steel-concrete beam that are separated.

[0066] In some embodiments,

[0067] On the inner wall of the lower section 201 of the steel pipe column, an inner-steel-pipe annular transverse diaphragm 206 is welded. The inner-steel-pipe annular transverse diaphragm 206 includes an upper inner-steel-pipe annular transverse diaphragm 2061 coplanar with the upper outer-steel-pipe annular transverse diaphragm 2051 and a lower inner-steel-pipe annular transverse diaphragm 2062 coplanar with the lower outer-steel-pipe annular transverse diaphragm 2052. The upper inner-steel-pipe annular transverse diaphragm 2061 and the lower inner-steel-pipe annular transverse diaphragm 2062 are respectively welded to the inner-steel-pipe rectangular vertical stiffening plate 203, the inner-steel-pipe wedge-shaped vertical stiffening plate 204, and the inner wall of the lower section 201 of the steel pipe column.

[0068] The inner-steel-pipe annular transverse diaphragm 206 is composed of the upper inner-steel-pipe annular transverse diaphragm 2061 and the lower inner-steel-pipe annular transverse diaphragm 2062, and their planar positions are respectively coplanar with the upper outer-steel-pipe annular transverse diaphragm 2051 and the lower outer-steel-pipe annular transverse diaphragm 2052 in the outer-steel-pipe annular transverse diaphragm 205. The inner-steel-pipe annular transverse diaphragm 206 is orthogonally arranged with the inner-steel-pipe rectangular vertical stiffening plate 203 and the inner-steel-pipe wedge-shaped vertical stiffening plate 204, effectively avoiding local buckling of the steel pipe wall and improving the overall stiffness of the transfer column foot joint.

[0069] In some embodiments, it further includes:

[0070] The longitudinal steel bars 211 of the steel pipe column are bent at 90° at the bottom and welded to the upper surface of the top flange 2072 of the intersection section. The upper steel bars are continued through the mechanical connection sleeve 214 at the top.

[0071] The circular stirrups 212 of the steel pipe column are bent at both ends to form L-shaped ends, and the L-shaped ends are welded and fixed to the sides of the rectangular vertical stiffening plates 203 and the wedge-shaped vertical stiffening plates 204 on the inner side of the steel pipe.

[0072] The longitudinal steel bars 211 of the steel pipe column are uniformly arranged along the outer periphery of the lower section 201 of the steel pipe column. They are bent at 90 degrees at the bottom and welded to the upper surface of the top flange 2072 of the intersection section 207 of the main and secondary beam steel sections. The upper steel bars are butt-jointed with the mechanical connection sleeve 214 at the top. The horizontal arc section of the circular stirrups 212 of the steel pipe column is tied and hooped with the longitudinal steel bars 211 of the steel pipe column, and the L-shaped ends formed by bending at both ends are lap-welded to the side surfaces of the stiffening plates. The bent and anchored section of the longitudinal steel bars 211 of the steel pipe column is welded and fixed to the top flange 2072 of the intersection section, which can effectively limit the vertical slip of the steel bars, and forms a space grid with the circular stirrups 212 of the steel pipe column to jointly restrain the shrinkage deformation of the core concrete and ensure the overall mechanical properties of the concrete-filled steel tube column. During construction, a steel bar positioning die is used to control the circumferential distribution spacing of the longitudinal steel bars to ensure that the bending angle and welding position of each steel bar are consistent.

[0073] The embodiment of the present invention also provides a construction method for the column foot node of any one of the column foot node embodiments as described above, including:

[0074] S1. The main beam steel section 304, the secondary beam steel section 305, the intersection section 207 of the main and secondary beam steel sections, and the lower section 201 of the steel pipe column are prefabricated in the factory in advance;

[0075] S2. Assemble and weld the intersection section 207 of the main and secondary beam steel sections and the lower section 201 of the steel pipe column in the factory, and process and weld the intersection section rectangular vertical stiffening plates 208, the intersection section arc-shaped vertical stiffening plates 209, the steel pipe outer side wedge-shaped vertical stiffening plates 202, the steel pipe inner side rectangular vertical stiffening plates 203, the steel pipe inner side wedge-shaped vertical stiffening plates 204, the steel pipe outer side circular diaphragm plates 205, the steel pipe inner side circular diaphragm plates 206, and the stud welds 210 to form the preliminary steel column foot 4;

[0076] S3. Position and install the preliminary steel column foot 4, the main beam steel section 304, and the secondary beam steel section 305 on-site;

[0077] S4. Set up the formwork, bind the steel bars, and pour the concrete on-site to form the cast-in-place column foot node;

[0078] S5. Position and weld the upper section 101 of the steel pipe column on-site, continue the steel bars at the top of the longitudinal steel bars 211 of the steel pipe column, and pour the concrete inside the pipe 102 to complete the installation of the steel pipe column structure 1.

[0079] The construction process of this node is divided into two stages: factory prefabrication and on-site assembly. First, the cross-shaped steel structure of the intersection section 207 of the main and secondary beam steel is positioned and welded with the lower section 201 of the steel pipe column in the factory. Then, the rectangular vertical stiffening plate 208 of the intersection section, the arc-shaped vertical stiffening plate 209 of the intersection section, the wedge-shaped vertical stiffening plate 202 on the outside of the steel pipe, the rectangular vertical stiffening plate 203 on the inside of the steel pipe, the wedge-shaped vertical stiffening plate 204 on the inside of the steel pipe, the annular diaphragm 205 on the outside of the steel pipe and the annular diaphragm 206 on the inside of the steel pipe are installed in sequence on the special welding tool. The welding and installation of the vertical stiffening plate and the annular diaphragm can be carried out by the segmented insertion method to minimize the impact between the welds. The cylindrical head welding nails 210 can be welded by an automatic welding machine according to the preset matrix points, thus forming the preliminary steel column foot 4. During on-site construction, the preliminary steel column foot 4 prefabricated in the factory is hoisted to the designed position, and its cross-extended end is butt-welded to the internal steel of the large-span steel-concrete beam-slab structure 3. Then the formwork is erected and the steel bars are tied on site. When pouring concrete, high-flow concrete is injected from the reserved pouring hole at the bottom of the lower section 201 of the steel pipe column. Multiple fan-shaped pouring holes 218 and circular overflow holes 219 are evenly arranged along the circumference of the lower section 201 of the steel pipe column at the top flange 2072 of the intersection section, and the edges of the holes can be rounded. When pouring concrete, concrete can be poured into the closed cavity formed by the intersection section 207 of the primary and secondary beam steel and the rectangular vertical stiffening plate 208 and the arc-shaped vertical stiffening plate 209 of the intersection section through the fan-shaped pouring hole 218 and the oblong hole 220 mentioned above. When the concrete is poured to the height of the circular overflow hole 219, the excess slurry is discharged from the circular overflow hole 219 by continuous pumping pressure to ensure the density of the concrete in the closed cavity. After the concrete is finally set, a cast-in-place column foot node is formed. When the upper structure is subsequently implemented, the upper section 101 of the steel pipe column is positioned and hoisted to the interface of the lower section 201 of the steel pipe column on site for welding, and the steel bars are connected through the mechanical connection sleeve 214 on the top of the longitudinal steel bar 211 of the steel pipe column, and the inner concrete 102 is poured into the upper section 101 of the steel pipe column to finally complete the installation of the steel pipe column structure 1.

[0080] It should be noted that the terms used in the present invention are only for describing specific embodiments, rather than limiting the scope of the present application. As shown in the present specification, unless the context clearly indicates an exception, the words "one", "a", "a kind of" and / or "the" do not specifically refer to the singular, but may also include the plural. The terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of more restrictions, the elements defined by the sentence "include one..." do not exclude the presence of other identical elements in the process, method or device including the elements.

[0081] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A column base joint supported by a large-span steel-concrete transfer beam, characterized in that, Including a cross-shaped plus arc-shaped combined column base node (2), the cross-shaped plus arc-shaped combined column base node (2) includes: The primary and secondary beam steel section intersection section (207) distributed in a cross shape; The lower section of the steel pipe column (201) welded to the top of the central axis of the primary and secondary beam steel section intersection section (207); The steel pipe outer side wedge-shaped vertical stiffening plate (202) welded along the central axis direction of the primary and secondary beam steel section intersection section (207) to the outer wall of the lower section of the steel pipe column (201) and the outside of the steel pipe of the primary and secondary beam steel section intersection section (207); The steel pipe inner side rectangular vertical stiffening plate (203) welded in a cross shape along the central axis direction of the primary and secondary beam steel section intersection section (207) to the inner wall of the lower section of the steel pipe column (201) and the inside of the steel pipe of the primary and secondary beam steel section intersection section (207), and the intersection point is located on the central axis of the lower section of the steel pipe column (201); The intersection section rectangular vertical stiffening plate (208) welded along the direction between adjacent central axes of the primary and secondary beam steel section intersection section (207) to the primary and secondary beam steel section intersection section (207); The intersection section arc-shaped vertical stiffening plate (209) welded between the primary and secondary beam steel section intersection section (207) and the intersection section rectangular vertical stiffening plate (208) and corresponding to the wall plate position of the lower section of the steel pipe column (201); The steel pipe column structure (1) is welded to the top of the lower section of the steel pipe column (201) and their central axes coincide; The internal steel of the long-span steel reinforced concrete beam and slab structure (3) is welded to the cross-shaped extended end face of the primary and secondary beam steel section intersection section (207).

2. The upper-supported steel pipe column base joint of a long-span steel-concrete transfer beam according to claim 1, characterized in that It further includes: The steel pipe inner side wedge-shaped vertical stiffening plate (204) welded to the inner wall of the lower section of the steel pipe column (201) and the inside of the steel pipe of the primary and secondary beam steel section intersection section (207), and the steel pipe inner side wedge-shaped vertical stiffening plate (204) is located between the cross-shaped steel pipe inner side rectangular vertical stiffening plates (203) and corresponds to the intersection section rectangular vertical stiffening plate (208).

3. The upper-supported steel pipe column base joint of a long-span steel-concrete transfer beam according to claim 2, characterized in that, The primary and secondary beam steel section intersection section (207) includes an intersection section top flange (2072), an intersection section web (2071), and an intersection section bottom flange (2073) sequentially distributed along the central axis direction of the lower section of the steel pipe column (201); Cylindrical head studs (210) are distributed in an array on the outer wall of the lower section of the steel pipe column (201), the outer wall of the intersection section top flange (2072), the outer wall of the intersection section bottom flange (2073), and both sides of the intersection section rectangular vertical stiffening plate (208).

4. According to a long-span steel reinforced concrete transfer beam upper supported steel pipe column base node as claimed in claim 3, wherein, An outer ring-shaped horizontal diaphragm (205) of the steel pipe is welded to the outer wall of the lower section (201) of the steel pipe column. The outer ring-shaped horizontal diaphragm (205) of the steel pipe includes an upper outer ring-shaped horizontal diaphragm (2051) of the steel pipe located at the elevation position of the top surface of the concrete pier (215) and a lower outer ring-shaped horizontal diaphragm (2052) of the steel pipe located at the elevation position of the center of the upper longitudinal reinforcement (216) of the steel-concrete beam. The upper outer ring-shaped horizontal diaphragm (2051) and the lower outer ring-shaped horizontal diaphragm (2052) of the steel pipe are respectively welded and connected to the outer wedge-shaped vertical stiffening plate (202) of the steel pipe and the outer wall of the lower section (201) of the steel pipe column.

5. A steel pipe column foot node supported by a long-span steel-concrete transfer beam according to claim 4, wherein An inner ring-shaped horizontal diaphragm (206) of the steel pipe is welded to the inner wall of the lower section (201) of the steel pipe column. The inner ring-shaped horizontal diaphragm (206) of the steel pipe includes an upper inner ring-shaped horizontal diaphragm (2061) coplanar with the upper outer ring-shaped horizontal diaphragm (2051) of the steel pipe and a lower inner ring-shaped horizontal diaphragm (2062) coplanar with the lower outer ring-shaped horizontal diaphragm (2052) of the steel pipe. The upper inner ring-shaped horizontal diaphragm (2061) and the lower inner ring-shaped horizontal diaphragm (2062) of the steel pipe are respectively welded and connected to the inner rectangular vertical stiffening plate (203) of the steel pipe, the inner wedge-shaped vertical stiffening plate (204) of the steel pipe, and the inner wall of the lower section (201) of the steel pipe column.

6. The upper bearing steel pipe column foot node of a long-span steel-concrete transfer beam according to claim 5, characterized in that, It further includes: Longitudinal steel bars (211) of the steel pipe column, whose bottoms are bent at 90° and welded to the upper surface of the top flange (2072) of the intersection section, and the tops are continued with the upper steel bars through mechanical connection sleeves (214); Circular stirrups (212) of the steel pipe column, whose two ends are respectively bent to form L-shaped ends, and the L-shaped ends are welded and fixed to the sides of the inner rectangular vertical stiffening plate (203) of the steel pipe and the inner wedge-shaped vertical stiffening plate (204) of the steel pipe.

7. A construction method for the upper bearing steel pipe column foot node of a long-span steel-concrete transfer beam as described in claim 6, characterized in that, It includes: S1. The main beam steel section (304), the secondary beam steel section (305), the intersection section (207) of the main and secondary beam steel sections, and the lower section (201) of the steel pipe column are prefabricated in the factory in advance; S2. The intersection section (207) of the main and secondary beam steel sections and the lower section (201) of the steel pipe column are assembled and welded in the factory, and the intersection section rectangular vertical stiffening plate (208), the intersection section arc-shaped vertical stiffening plate (209), the outer wedge-shaped vertical stiffening plate (202) of the steel pipe, the inner rectangular vertical stiffening plate (203) of the steel pipe, the inner wedge-shaped vertical stiffening plate (204) of the steel pipe, the outer ring-shaped horizontal diaphragm (205) of the steel pipe, the inner ring-shaped horizontal diaphragm (206) of the steel pipe, and the stud welds (210) are processed and welded to form a preliminary steel column foot (4); S3. The preliminary steel column foot (4), the main beam steel section (304), and the secondary beam steel section (305) are positioned and installed on site; S4. Formwork is erected, steel bars are tied, and concrete is poured on site to form a cast-in-place column foot joint; S5. The upper section (101) of the steel pipe column is positioned and welded on site, the steel bars are continued at the top of the longitudinal steel bars (211) of the steel pipe column, and the concrete inside the pipe (102) is poured to complete the installation of the steel pipe column structure (1).

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