Large-span steel reinforced concrete transfer beam upper supporting steel pipe column base joint and construction method

Abstract

The invention relates to a large-span steel reinforced concrete transfer beam upper supporting steel pipe column base joint and a construction method. The joint comprises a cross-shaped main beam and secondary beam section steel intersection section, a steel pipe column lower section welded to the top of the intersection section, stiffening plates distributed along the inner wall and the outer wall of a steel pipe column and a connecting structure. The cross-shaped outward-extending end face of the intersection section of the main beam profile steel and the secondary beam profile steel is welded to profile steel inside the large-span steel reinforced concrete beam slab structure, and the lower section of the steel pipe column and the intersection section form a linear force transmission path through axis centering welding. The wedge-shaped vertical stiffening plates on the outer sides of the steel pipes decompose the force of the steel pipe columns and introduce the force into the surrounding transfer beams, so that the bending strength of the column foot joints is effectively improved; rectangular vertical stiffening plates on the inner sides of the steel pipes are welded to the inner wall of the column in a crossed mode, and internal stress is evenly dispersed. The intersection section rectangle and the arc-shaped vertical stiffening plate are welded in a nested mode to form a multidirectional rigid structure. A plurality of force transmission systems are established through the spatial layout of the stiffening plates, stress concentration is avoided, and the overall rigidity is improved. The node is suitable for a large-span conversion layer structure.

Description

Technical Field

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

[0002] In large underground space projects, traditional steel reinforced concrete transfer beam-column foot nodes generally have problems such as unclear force transmission paths and significant stress concentration. Most existing nodes adopt planar stiffening plates, 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 with dense stiffening plates, making it easy to produce weld defects; during concrete pouring, voids are easily formed in the core area of the node due to the obstruction of the stiffening plates, affecting the compactness. In addition, the conventional diaphragm structure has insufficient restraint on the steel pipe wall, and local buckling is likely to occur under dynamic loads, making it difficult to meet the rigid requirements of the transfer column foot nodes of the integrated above-ground and underground structures. Although there are individual solutions attempting to optimize the layout of the stiffening plates, a multi-directional coordinated 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 steel pipe column foot node 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 steel pipe column foot node supported by a large-span steel reinforced concrete transfer beam, including a cross-shaped plus arc combined column foot node, and the cross-shaped plus arc combined column foot node includes: The intersection section of the primary and secondary beam steel sections distributed in a cross shape; 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; The steel pipe outer wedge-shaped vertical stiffening plates welded along the central axis direction of the intersection section of the primary and secondary beam steel sections 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; The steel pipe inner rectangular vertical stiffening plates welded in a cross shape along the central axis direction of the intersection section of the primary and secondary beam steel sections 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, and the intersection point is located on the central axis of the lower section of the steel pipe column; The intersection section rectangular vertical stiffening plates welded along the direction between the adjacent central axes of the intersection section of the primary and secondary beam steel sections to the intersection section of the primary and secondary beam steel sections; The intersection section arc-shaped vertical stiffening plates welded between the intersection section of the primary and secondary beam steel sections and the intersection section rectangular vertical stiffening plates and corresponding to the position of the wall plate of the lower section of the steel pipe column; The steel pipe column structure is welded to the top of the lower section of the steel pipe column and their central axes coincide.

[0005] The internal steel shapes of the long-span steel reinforced concrete beam-slab structure are welded to the cross-shaped extended end faces at the intersection section of the main and secondary beam steel shapes.

[0006] Optionally, it further includes: 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 rectangular vertical stiffening plates at the intersection section.

[0007] 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; Studs are distributed 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 rectangular vertical stiffening plates at the intersection section.

[0008] Optionally, An outer ring diaphragm of the steel pipe is welded to the outer wall of the lower section of the steel pipe column. The outer ring diaphragm of the steel pipe includes an upper outer ring diaphragm of the steel pipe located at the elevation position of the top surface of the concrete pier and a lower outer ring diaphragm of the steel pipe located at the elevation position of the center of the upper longitudinal reinforcement of the steel reinforced concrete beam.

[0009] Optionally, An inner ring diaphragm of the steel pipe is welded to the inner wall of the lower section of the steel pipe column. The inner ring diaphragm of the steel pipe includes an upper inner ring diaphragm of the steel pipe coplanar with the upper outer ring diaphragm of the steel pipe and a lower inner ring diaphragm of the steel pipe coplanar with the lower outer ring diaphragm of the steel pipe. The upper inner ring diaphragm of the steel pipe and the lower inner ring diaphragm of the steel pipe are respectively welded and connected to the inner side rectangular vertical stiffening plates of the steel pipe, the inner side wedge-shaped vertical stiffening plates of the steel pipe, and the inner wall of the lower section of the steel pipe column.

[0010] Optionally: Longitudinal steel bars of the steel pipe column, whose bottoms are bent at 90° and welded to the upper surface of the top flange of the intersection section, and the tops are continued with the upper steel bars through mechanical connection sleeves; Circular stirrups 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 side rectangular vertical stiffening plates of the steel pipe and the sides of the inner side wedge-shaped vertical stiffening plates of the steel pipe.

[0011] In a second aspect, the present invention also provides a construction method for the column foot joint as described in any item of the first aspect, including: S1. Prepare the main beam steel shape, secondary beam steel shape, intersection section of the main and secondary beam steel shapes, and lower section of the steel pipe column in the factory in advance; S2. Assemble and weld the intersection section of the 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 outside of the steel pipe, rectangular vertical stiffening plates on the inside of the steel pipe, wedge-shaped vertical stiffening plates on the inside of the steel pipe, annular diaphragms on the outside of the steel pipe, annular diaphragms on the inside of the steel pipe, and stud welding nails to form a preliminary steel column foot. S3. Position and install the preliminary steel column foot, main beam steel section, and secondary beam steel section on site. S4. Erect the formwork, bind the steel bars, and pour the concrete on site to form a cast-in-place column foot joint. 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.

[0012] The embodiments of the present invention have the following technical effects: In the present invention, a spatial three-dimensional force transmission system is formed by arranging vertically distributed stiffening plates and annular diaphragms in a multi-directional manner in the cross-shaped plus arc-shaped combined column foot joint. The cross-shaped and inclined 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 foot joint, avoiding stress concentration. The inner and outer annular diaphragms of the steel pipe form double rigid constraints at key height positions, effectively improving the overall stiffness of the joint area and restraining the deformation of the steel pipe column wall. The combination of the wedge-shaped structure of the inner stiffening plates 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 coordinated work of the steel pipe and concrete. The matrix distribution of the stud welding nails 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

[0013] In order 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, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic structural diagram of the cast-in-place rigid column foot joint in the present invention; Figure 2 It is a schematic diagram of the internal steel section composition of the column foot joint in the present invention; Figure 3 It is a schematic diagram of the internal and external steel plate components of the lower section of the steel pipe column in the present invention; Figure 4 Schematic diagram of the inner and outer steel plate components at the intersection of the primary and secondary beam steel sections in the present invention; Figure 5 Elevation view of the internal steel section of the column footing joint in the present invention; Figure 6 is Figure 5 A - A cross-sectional view in Figure 7 is Figure 5 B - B cross-sectional view in Figure 8 is Figure 5 C - C cross-sectional view in Figure 9 Schematic diagram of the arrangement of the upper longitudinal reinforcement in the steel - reinforced concrete beam in the present invention; Figure 10 Schematic diagram of the connection between the upper longitudinal reinforcement of the steel - reinforced concrete beam, the pier - platform reinforcement and the outer - tube circular diaphragm in the present invention; Figure 11 Schematic diagram of the arrangement of the longitudinal reinforcement and the circular stirrups of the steel pipe column in the present invention.

[0015] Reference numerals 1. Steel pipe column structure; 101. Upper section of the steel pipe column; 102. Concrete inside the pipe; 2. Cross - shaped plus arc - shaped combined column footing joint; 201. Lower section of the steel pipe column; 202. Outer - tube wedge - shaped vertical stiffening plate; 203. Inner - tube rectangular vertical stiffening plate; 204. Inner - tube wedge - shaped vertical stiffening plate; 205. Outer - tube circular diaphragm; 2051. Upper outer - tube circular diaphragm; 2052. Lower outer - tube circular diaphragm; 206. Inner - tube circular diaphragm; 2061. Upper inner - tube circular diaphragm; 2062. Lower inner - tube circular diaphragm; 207. Intersection of primary 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 weld; 211. Longitudinal reinforcement of the steel pipe column; 212. Circular stirrup of the steel pipe column; 213. Pier - platform reinforcement; 214. Mechanical connection sleeve; 215. Concrete pier - platform; 216. Upper longitudinal reinforcement of the steel - reinforced concrete beam; 217. Square hole; 218. Sector - shaped pouring hole; 219. Circular overflow hole; 220. Elongated round hole; 221. End vertical stiffening plate of the intersection section; 3. Long - span steel - reinforced concrete beam - 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 footing. Detailed implementation manners

[0016] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below. Apparently, 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 protected by the present invention.

[0017] Figures 1 - 11 The figure is a schematic diagram of a column foot node structure of a steel pipe supported by a long-span steel-concrete transfer beam provided by an embodiment of the present invention, including a cross-shaped plus arc-shaped combined column foot node 2, and the cross-shaped plus arc-shaped combined column foot node 2 includes: The primary and secondary beam steel section intersection segments 207 distributed in a cross shape; The lower section 201 of the steel pipe column welded to the top of the central axis of the primary and secondary beam steel section intersection segments 207; The steel pipe outer wedge-shaped vertical stiffening plates 202 welded along the central axis direction of the primary and secondary beam steel section intersection segments 207 to the outer wall of the lower section 201 of the steel pipe column and the outside of the steel pipe of the primary and secondary beam steel section intersection segments 207; The steel pipe inner rectangular vertical stiffening plates 203 welded in a cross shape along the central axis direction of the primary and secondary beam steel section intersection segments 207 to the inner wall of the lower section 201 of the steel pipe column and the inside of the steel pipe of the primary and secondary beam steel section intersection segments 207, and the intersection point is located on the central axis of the lower section 201 of the steel pipe column; The intersection section rectangular vertical stiffening plates 208 welded along the direction between the adjacent central axes of the primary and secondary beam steel section intersection segments 207 to the primary and secondary beam steel section intersection segments 207; The intersection section arc-shaped vertical stiffening plates 209 welded between the primary and secondary beam steel section intersection segments 207 and the intersection section rectangular vertical stiffening plates 208 and corresponding to the wall plate position of the lower section 201 of the steel pipe column; 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.

[0018] The internal steel shapes of the long-span steel-concrete beam and slab structure 3 are welded to the cross-shaped extended end faces of the primary and secondary beam steel section intersection segments 207.

[0019] 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-concrete beam-slab structure 3 to form a complete conversion force transmission 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 central 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-radial 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, forming an internal and external rigid framework to evenly disperse the upper load to the four extended directions of the intersection section 207 of the main and secondary beam steel sections, and then conduct it to the main and secondary beam steel sections. The wedge-shaped vertical stiffening plates 202 on the outer side of the steel pipe have square holes 217. The rectangular vertical stiffening plates 208 of the intersection section are 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 to enhance the shear resistance of the joint area through vertical welding. Except for this position, the extended end faces of the intersection section 207 of the main and secondary beam steel sections are provided with vertical stiffening plates 221 at the end of the intersection section, that is, arranged between this end face and the long-span steel-concrete beam-slab structure 3. The arc-shaped vertical stiffening plates 209 of the intersection section are located at the corresponding positions 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. The outer arc surface thereof matches the curvature of the outer wall of the lower section 201 of the steel pipe column, and is welded to the side of the rectangular vertical stiffening plate 208 of the intersection section to form a continuous and complete stress transmission interface. A long round 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 round 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 round hole 220 to assist in vibrating, 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-concrete beam-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 to realize the continuous extension of the steel sections of the type conversion column foot node. After the upper section 101 of the steel pipe column and the top of the lower section 201 of the steel pipe column are butt-welded, the concrete 102 in the pipe is poured, that is, a complete force transmission system between the conversion column foot node and the upper structure is formed. The long-span steel-concrete beam-slab structure 3 is composed of frame main beams 301, frame secondary beams 302 and reinforced concrete slabs 303. The frame main beams 301 and frame secondary beams 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.

[0020] In some embodiments, it further includes: The wedge-shaped vertical stiffening plate 204 on the inner side of the steel pipe 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. The wedge-shaped vertical stiffening plate 204 on the inner side of the steel pipe 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.

[0021] 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.

[0022] 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; Studs 210 are arranged 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 at the intersection section.

[0023] 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 section. The full-penetration groove welding is used at the cross intersection to ensure the section stiffness. The 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 at 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 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.

[0024] In some embodiments, 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 stiffener 202 and the outer wall of the lower section 201 of the steel pipe column.

[0025] 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 stiffener 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 interrupted upper longitudinal bars 216 of the steel-concrete beam.

[0026] In some embodiments, 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 stiffener 203, the inner-steel-pipe wedge-shaped vertical stiffener 204, and the inner wall of the lower section 201 of the steel pipe column.

[0027] 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 stiffener 203 and the inner-steel-pipe wedge-shaped vertical stiffener 204, effectively avoiding local buckling of the steel pipe wall and improving the overall stiffness of the transfer column foot joint.

[0028] In some embodiments, it further includes: 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 part of the steel bars is continued through the mechanical connection sleeve 214 at the top. 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.

[0029] The longitudinal steel bars 211 of the steel pipe column are evenly arranged along the outer circumference of the lower section 201 of the steel pipe column. The bottom is bent at 90 degrees 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 top is butt-connected to the upper steel bars by the mechanical connection sleeve 214. 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 of the stiffening plate. 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 form 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 pipe 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.

[0030] The embodiment of the present invention also provides a construction method for the column foot node of any one of the above column foot node embodiments, including: 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. 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 plate 208, the intersection section arc-shaped vertical stiffening plate 209, the steel pipe outer side wedge-shaped vertical stiffening plate 202, the steel pipe inner side rectangular vertical stiffening plate 203, the steel pipe inner side wedge-shaped vertical stiffening plate 204, the steel pipe outer side circular diaphragm plate 205, the steel pipe inner side circular diaphragm plate 206, and the stud 210 to form the preliminary steel column foot 4; 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; S4. Set up the formwork, bind the steel bars, and pour the concrete on site to form the cast-in-place column foot node; 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 102 inside the pipe to complete the installation of the steel pipe column structure 1.

[0031] 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.

[0032] 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.

[0033] 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 situations.

[0034] 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 it; 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 recorded in the foregoing embodiments, or perform equivalent replacements on 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 long-span steel-concrete transfer beam supporting steel pipe column foot node, characterized in that: It comprises a cross-shaped plus arc-shaped combined column foot node (2), and the cross-shaped plus arc-shaped combined column foot node (2) comprises: The intersection section (207) of the main and secondary beam steel sections distributed in a cross shape; A lower section of a steel pipe column (201) welded to the top of the central axis of the intersection section (207) of the primary and secondary beam steels; A wedge-shaped vertical stiffening plate (202) welded to the outer wall of the lower section of the steel pipe column (201) and the outer side of the steel pipe at the intersection section (207) of the primary and secondary beams along the central axis direction of the intersection section (207) of the primary and secondary beams; A rectangular vertical stiffening plate (203) is welded in a cross shape to the inner wall of the steel pipe column lower section (201) and the inner side of the steel pipe of the main and secondary beam steel intersection section (207) along the central axis of the main and secondary beam steel intersection section (207), with the intersection point located at the central axis of the steel pipe column lower section (201); A rectangular vertical stiffening plate (208) welded to the intersection section (207) of the primary and secondary beam steel sections along the direction between adjacent central axes of the intersection section (207) of the primary and secondary beam steel sections; An intersection arc-shaped vertical stiffening plate (209) welded between the intersection section (207) of the primary and secondary beam steel sections and the intersection rectangular vertical stiffening plate (208) and corresponding to the wall plate position of the lower section (201) of the steel pipe column; The steel pipe column structure (1) is welded to the top of the steel pipe column lower section (201) and the central axes of the two coincide with each other; The internal steel sections of the large-span steel-concrete beam-slab structure (3) are welded to the cross-extended end surface of the intersection section (207) of the primary and secondary beam steel sections.

2. The node according to claim 1, characterized in that Also includes: A steel pipe inner wedge-shaped vertical stiffening plate (204) is welded to the inner wall of the steel pipe column lower section (201) and the main and secondary beam steel intersection section (207); the steel pipe inner wedge-shaped vertical stiffening plate (204) is located between the steel pipe inner rectangular vertical stiffening plates (203) in a cross shape and corresponds to the intersection section rectangular vertical stiffening plate (208).

3. The node according to claim 1, characterized in that The main and secondary beam steel intersection section (207) comprises an intersection section top flange (2072), an intersection section web (2071), and an intersection section bottom flange (2073) which are sequentially distributed along the central axis direction of the steel pipe column lower section (201); 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 both sides of the rectangular vertical stiffening plate (208) of the intersection section are all provided with cylindrical head welding nails (210) distributed in an array form.

4. The node according to claim 1, characterized in that The outer wall of the lower section (201) of the steel pipe column is welded with an outer annular diaphragm (205) of the steel pipe. The outer annular diaphragm (205) of the steel pipe comprises an upper outer annular diaphragm (2051) of the steel pipe located at the top elevation of the concrete pier (215) and a lower outer annular diaphragm (2052) of the steel pipe located at the center elevation of the upper longitudinal reinforcement (216) of the steel concrete beam. The upper outer annular diaphragm (2051) of the steel pipe and the lower outer annular diaphragm (2052) of the steel pipe are respectively welded 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. The node according to claim 4, characterized in that: A steel pipe inner annular diaphragm (206) is welded to the inner wall of the steel pipe column lower section (201), and the steel pipe inner annular diaphragm (206) comprises an inner upper annular diaphragm (2061) coplanar with the outer upper annular diaphragm (2051) of the steel pipe and an inner lower annular diaphragm (2062) coplanar with the outer lower annular diaphragm (2052) of the steel pipe. The inner upper annular diaphragm (2061) and the inner lower annular diaphragm (2062) are respectively welded 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 steel pipe column lower section (201).

6. The node according to claim 3, characterized in that: Also includes: The longitudinal steel bars (211) of the steel pipe column are bent at 90 degrees at the bottom and welded to the upper surface of the top flange (2072) of the intersection section, and the top is connected to the upper steel bars via a mechanical connection sleeve (214); The steel pipe column annular stirrup (212) has two ends bent to form L-shaped ends, and the L-shaped ends are welded and fixed to the side surfaces of the rectangular vertical stiffening plate (203) inside the steel pipe and the side surfaces of the wedge-shaped vertical stiffening plate (204) inside the steel pipe.

7. A construction method for a column foot node according to any one of claims 1 to 6, characterized in that: include: S1. The factory pre-prepares the main beam steel (304), the secondary beam steel (305), the main and secondary beam steel intersection section (207), and the lower section of the steel pipe column (201); S2. The intersection section (207) of the primary and secondary beams and the lower section (201) of the steel pipe column are assembled and welded in the factory, and the rectangular vertical stiffener (208) of the intersection section, the arc-shaped vertical stiffener (209) of the intersection section, the wedge-shaped vertical stiffener (202) of the outer side of the steel pipe, the rectangular vertical stiffener (203) of the inner side of the steel pipe, the wedge-shaped vertical stiffener (204) of the inner side of the steel pipe, the annular diaphragm (205) of the outer side of the steel pipe, the annular diaphragm (206) of the inner side of the steel pipe, and the cylindrical head welding nail (210) are processed and welded to form the preliminary steel column foot (4); S3. Position and install the preliminary steel column foot (4), the main beam steel (304), and the secondary beam steel (305) on site; S4. Erection of formwork, steel bar tying and concrete pouring to form cast-in-place column foot nodes; S5. Position welding is performed on the upper section of the steel pipe column (101) on site, steel bars are connected to the top of the longitudinal steel bars (211) of the steel pipe column, and concrete (102) is poured inside the pipe to complete the installation of the steel pipe column structure (1).

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