A structure of a steel-concrete connection joint with enlarged cross section and a construction method thereof

Abstract

The application relates to the technical field of building, and provides an expanded-section steel-concrete connecting joint structure and a construction method, which comprises a steel structure expanded column head, a steel structure reserved connecting joint and a concrete structure reserved connecting joint; the steel structure expanded column head is arranged between a lower concrete column and an upper expanded-section column; the steel structure expanded column head comprises an expanded-section partial column head and an original-section partial column head; the original-section partial column head is connected with the concrete structure reserved connecting joint, the expanded-section partial column head is connected with the steel structure reserved connecting joint, and cavities for pouring concrete are arranged in the expanded-section partial column head and the original-section partial column head respectively. The application improves the overall safety, saves the steel consumption of setting the stiff steel column, reduces a large amount of on-site complicated welding operation, shortens the overall construction period, and reduces the construction cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building, and particularly relates to an expanded-section steel-concrete connecting joint structure and a construction method. BACKGROUND

[0002] With the development of the construction industry into the green and low-carbon stage, the steel structure corridor becomes a key link for building modern buildings. However, the steel structure corridor generally has a large self-weight, and is supported by two tower buildings. Therefore, the connecting structure between the tower building and the corridor has high strength requirements. Therefore, how to ensure the mechanical properties of the tower support structure, the effectiveness of the joint connection, and the quality and safety of the installation process is the most important problem in the construction of the steel corridor and the external steel structure. At present, the common steel-concrete structure connection method is to use full-floor steel columns (or called stiff columns) in the tower building to anchor connect with the steel corridor or to reserve a concrete or steel bracket structure as a hinged connection. The stiff columns need to be set through the upper and lower floors to buffer the stress changes caused by the connected structure, resulting in a generally large amount of steel on site, high cost, high welding quality requirements for the stiff column construction, waiting for the welding detection before proceeding with the subsequent process, low overall efficiency, high requirements for hoisting equipment due to the large self-weight of the stiff column, long hoisting time, and high cost of hoisting equipment. The bearing capacity of the bracket structure is limited, the mechanical properties of the connecting joint are difficult to guarantee, and the safety risk is large. Therefore, the existing steel structure corridor and external steel structure truss connection technology and construction method still has certain drawbacks. SUMMARY

[0003] In view of the above problems in the prior art, the application provides an expanded-section steel-concrete connecting joint structure and a construction method. The mechanical properties of the joint and the connecting strength are strengthened, the steel consumption of the stiff column is effectively saved, the cost is reduced, and the efficiency is increased.

[0004] In a first aspect, the present application provides an enlarged cross-section steel-concrete connection node structure, comprising: a steel structure enlarged column head, a steel structure reserved connection node, and a concrete structure reserved connection node; the steel structure enlarged column head is arranged between a lower concrete column and an upper enlarged cross-section column; the steel structure enlarged column head comprises an enlarged cross-section part column head and an original cross-section part column head; the original cross-section part column head is connected with the concrete structure reserved connection node, and the concrete structure reserved connection node is used for connecting with a lower concrete structure; the enlarged cross-section part column head is connected with the steel structure reserved connection node, and the steel structure reserved connection node is used for connecting with an external steel structure; cavities for pouring concrete are respectively arranged in the enlarged cross-section part column head and the original cross-section part column head; upper ends of longitudinal steel bars of the lower concrete column are inserted into the cavity of the original cross-section part column head; a part of longitudinal steel bars of the upper enlarged cross-section column is inserted into the cavity of the enlarged cross-section part column head, and another part of longitudinal steel bars is inserted into the cavity of the original cross-section part column head and connected with the longitudinal steel bars of the lower concrete column.

[0005] Further, the steel structure enlarged column head comprises a wall plate, a longitudinal partition plate, and a bottom sealing plate; the wall plate surrounds the cavity through the longitudinal direction of the upper enlarged cross-section column; the longitudinal partition plate is arranged in the cavity to divide the cavity into an original cross-section cavity and an enlarged cross-section cavity; and the bottom sealing plate seals the bottom of the enlarged cross-section cavity.

[0006] Further, the steel structure enlarged column head further comprises a transverse partition plate; the original cross-section cavity and the enlarged cross-section cavity are respectively provided with the transverse partition plate; and the transverse partition plate is provided with a steel bar reserved hole and a blanking hole.

[0007] Further, the transverse partition plate is connected with a stiffening rib plate; and the stiffening rib plate is further connected with the wall plate or the longitudinal partition plate.

[0008] Further, at least two transverse partition plates are respectively arranged in the original cross-section cavity and the enlarged cross-section cavity in a longitudinal direction, so as to divide the original cross-section cavity and the enlarged cross-section cavity into multiple sub-cavities.

[0009] Further, the steel structure reserved connection node comprises a chord reserved node and a floor slab steel beam reserved node; and the floor slab steel beam reserved node is provided with a stud.

[0010] Further, the lower concrete structure comprises a lower concrete shear wall; the concrete structure reserved connection node comprises a comb plate; the comb plate is composed of multiple steel plates arranged equidistantly in a longitudinal direction, one end of the comb plate is connected with the original cross-section part column head, and the other end is arranged in the lower concrete shear wall.

[0011] Further, the lower concrete structure comprises a lower concrete beam; the concrete structure reserved connecting joint comprises a concrete beam embedded joint; the concrete beam embedded joint comprises a steel beam and a stiffened threaded steel bar; the steel beam comprises a web plate and a wing plate; the stiffened threaded steel bar is welded on the surface of the wing plate; one end of the steel beam is connected with the original section part column head, and the other end is arranged in the lower concrete beam.

[0012] In a second aspect, the present application further provides a construction method of the enlarged section type steel-concrete connecting joint structure, comprising the following steps:

[0013] When the lower concrete structure is constructed, the concrete structure reserved connecting joint of the enlarged section type steel-concrete connecting joint structure is embedded in the lower concrete structure;

[0014] The steel structure enlarged column head connected with the steel structure reserved connecting joint is hoisted to the top of the lower concrete column;

[0015] The upper end of the longitudinal steel bar of the lower concrete column is inserted into the cavity of the original section part column head of the steel structure enlarged column head;

[0016] A part of the longitudinal steel bar of the upper enlarged section column is inserted into the cavity of the enlarged section part column head of the steel structure enlarged column head, and the other part of the longitudinal steel bar is inserted into the cavity of the original section part column head and connected with the longitudinal steel bar of the lower concrete column;

[0017] The concrete is poured into the cavities and vibrated and compacted.

[0018] Further, the step of hoisting the steel structure enlarged column head connected with the steel structure reserved connecting joint to the top of the lower concrete column comprises:

[0019] The cantilevered I-beam arranged on the lower concrete structure is used as the basis of the support system, and a disc buckle frame body is erected above the cantilevered I-beam as the support system;

[0020] The steel structure enlarged column head is hoisted to the support system by using a truck crane, accurately positioned by using a total station, and finely adjusted by using an electric hoist;

[0021] The original section part column head of the steel structure enlarged column head is connected with the concrete structure reserved connecting joint.

[0022] The beneficial effects of the present application include: for the working condition of the concrete structure tower outside the steel structure corridor or heavy steel structure, and the connection condition of the non-traditional concrete column and the steel structure, by adopting the connecting joint of the present application, the connecting of the concrete structure with high strength and high mechanical property and the steel structure is arranged, the conventional embedded bracket or the full-length stiff steel column is replaced by the connecting joint, the safety hidden danger of insufficient shear strength and easy fatigue crack at the rigid joint support caused by the traditional steel-concrete structure is avoided, the overall safety is improved, and the steel consumption of the arranged stiff steel column is effectively saved. Meanwhile, the node can be factory prefabricated and processed, a large amount of on-site complicated welding operation is reduced, the overall construction period is shortened under the premise of ensuring construction safety, so that the construction cost is reduced; meanwhile, the present application adopts the standardized and recyclable construction method, so that the construction is more simple, convenient and efficient, and the green and low-carbon construction concept is highlighted; the node construction of the conversion of the concrete structure to the steel structure is suitable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a sectional structure diagram of the steel structure enlarged column head of the present application.

[0024] Figure 2 It is a sectional structure diagram of the steel structure enlarged column head of the present application. Figure 1

[0025] Figure 3 It is a sectional structure diagram of the steel structure enlarged column head of the present application. Figure 1

[0026] In the drawings:

[0027] 1-steel structure enlarged column head; 11-wall plate; 12-transverse partition plate; 121-steel bar reserved hole; 122-cutting port; 13-stiffened rib plate; 14-longitudinal partition plate; 15-bottom sealing plate;

[0028] 2-steel structure reserved connecting joint; 21-chord reserved node; 22-floor slab steel beam reserved node;

[0029] 3-concrete structure embedded connecting joint; 31-comb plate; 32-concrete beam embedded node; 321-beam wing plate; 322-beam web; 323-stiffened screw bar;

[0030] 4-lower layer concrete structure; 41-lower layer concrete beam; 42-lower layer concrete shear wall; 43-lower layer concrete column;

[0031] 5-upper layer enlarged section column. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in combination with the drawings and specific embodiments. ​​

[0033] As Figures 1-3 shown, the enlarged cross-section steel-concrete connection joint structure of the present application comprises a steel structure enlarged column head 1, a steel structure reserved connection joint 2 and a concrete structure reserved connection joint.

[0034] The enlarged cross-section steel-concrete connection joint structure is connected between a lower concrete structure 4 and an upper enlarged cross-section column 5; wherein the lower concrete structure 4 and the upper enlarged cross-section column 5 can be understood as existing structures. For example, the concrete structure tower of the present embodiment is connected with a steel structure corridor or heavy steel structure. The lower concrete structure 4 comprises a lower concrete beam 41, a lower concrete shear wall 42 and a lower concrete column 43; in some embodiments, the lower concrete structure 4 can only comprise the lower concrete beam 41 and the lower concrete shear wall 42.

[0035] The steel structure enlarged column head 1 is arranged between the lower concrete column 43 and the upper enlarged cross-section column 5, wherein the cross-sectional size of the lower concrete column 43 is smaller than that of the upper enlarged cross-section column 5. The cross-sectional size of the steel structure enlarged column head 1 is greater than or equal to that of the upper enlarged cross-section column 5.

[0036] The steel structure enlarged column head 1 comprises an enlarged cross-section part column head and an original cross-section part column head; the original cross-section part column head is connected with the concrete structure reserved connection joint, which is used for connecting with the lower concrete structure 4; the enlarged cross-section part column head is connected with the steel structure reserved connection joint 2, which is used for connecting with the external steel structure.

[0037] The enlarged cross-section part column head and the original cross-section part column head are respectively provided with cavities for pouring concrete; the upper end of the longitudinal reinforcement of the lower concrete column 43 is inserted into the cavity of the original cross-section part column head; a part of the longitudinal reinforcement of the upper enlarged cross-section column 5 is inserted into the cavity of the enlarged cross-section part column head, and another part of the longitudinal reinforcement is inserted into the cavity of the original cross-section part column head and connected with the longitudinal reinforcement of the lower concrete column 43.

[0038] As Figure 2 shown, the steel structure enlarged column head 1 comprises wall plates 11 made of steel plates, longitudinal partitions 14, transverse partitions 12, stiffening rib plates 13 and bottom sealing plates 15; the wall plates 11 enclose a longitudinally-through cavity along the circumference of the upper enlarged cross-section column 5; since the steel structure enlarged column head 1 is produced earlier than the upper enlarged cross-section column 5, the cross-sectional size of the steel structure enlarged column head 1 is designed according to the cross-sectional size of the upper enlarged cross-section column 5, so as to determine the number and size of the wall plates 11, and finally the wall plates 11 are welded into a box-shaped structure along the circumference of the upper enlarged cross-section column 5 to be constructed.

[0039] The longitudinal partition plate 14 is arranged in the cavity to divide the cavity into a primary cross-section cavity and an expanded cross-section cavity, and the thickness of the longitudinal partition plate 14 is 30 mm; the two sides of the longitudinal partition plate 14 are respectively welded and fixed to the inner walls of the two opposite wall plates 11. The bottom sealing plate 15 seals the bottom of the expanded cross-section cavity.

[0040] Two transverse partition plates 12 are respectively arranged in the primary cross-section cavity and the expanded cross-section cavity; the thickness of the transverse partition plate 12 is 30 mm, the transverse partition plate 12 is provided with a steel bar reserved hole 121 and a discharging port 122, the discharging port 122 is arranged at the center of the transverse partition plate 12, the discharging port 122 is used for concrete pouring, and the discharging port 122 is a circular hole with a diameter of 300 mm. The steel bar reserved hole 121 is arranged around the transverse partition plate 12. The stiffening rib plate 13 is also arranged around the transverse partition plate 12, the stiffening rib plate 13 adopts a trapezoidal steel plate, the plate surface is perpendicular to the plate surface of the transverse partition plate 12, one end of the stiffening rib plate 13 is welded and fixed to the transverse partition plate 12, and the plate surface of the stiffening rib plate 13 is also welded and fixed to the longitudinal partition plate 14 or the wall plate 11. The shear strength of the reinforced steel structure expanded column head 1 is improved.

[0041] Two transverse partition plates 12 are respectively arranged in the primary cross-section cavity and the expanded cross-section cavity along the longitudinal direction, so as to divide the primary cross-section cavity and the expanded cross-section cavity into multiple sub-cavities. Figure 2 As shown in the figure, the two transverse partition plates 12 in the primary cross-section cavity divide the primary cross-section cavity into two sub-cavities, the cross section of the expanded cross-section cavity is smaller than that of the primary cross-section cavity, the two transverse partition plates 12 in the expanded cross-section cavity and the bottom sealing plate 15 at the bottom divide the expanded cross-section cavity into three sub-cavities. The three sub-cavities in the expanded cross-section cavity are communicated with each other. The two sub-cavities in the primary cross-section cavity are communicated with each other. A plurality of stiffening rib plates 13 are arranged between the bottom sealing plate 15 in the expanded cross-section cavity and the transverse partition plate 12 above the bottom sealing plate 15, so as to effectively improve the shear strength of the steel structure expanded column head 1. Figure 2 As shown in the figure, the plate surface of the longitudinal partition plate 14 is respectively welded and fixed with the stiffening rib plates 13 on both sides, so as to improve the rigidity of the longitudinal partition plate 14.

[0042] The steel structure reserved connecting joint 2 includes a chord reserved joint 21 and a floor slab steel beam reserved joint 22; the floor slab steel beam reserved joint 22 is provided with a stud. The chord reserved joint 21 and the floor slab steel beam reserved joint 22 are both box girders welded on the wall plates 11 of the steel structure expanded column head 1 in different directions. Of course, the connecting direction of the chord reserved joint 21 and the floor slab steel beam reserved joint 22 in the steel structure expanded column head 1 is not limited in the embodiment. The chord reserved joint 21 is used for connecting with an external steel structure, and the floor slab steel beam reserved joint 22 is used for connecting with an external truss.

[0043] The lower concrete structure 4 includes a lower concrete shear wall 42 and a lower concrete beam 41.

[0044] The reserved connection nodes for the concrete structure include comb plate 31 and embedded node 32 for the concrete beam.

[0045] The comb plate 31 is composed of multiple "convex" shaped steel plates arranged longitudinally at equal intervals. One end of the comb plate 31 is connected to the column head of the original section, and the other end is inserted into the top of the lower concrete shear wall 42 and welded to its longitudinal steel bars and stirrups to strengthen the anchorage with the lower concrete shear wall 42.

[0046] like Figure 3 As shown, the pre-embedded node 32 of the concrete beam includes a steel beam and a stiffening threaded steel bar 323; the steel beam includes a beam web 322 and a beam flange 321; the stiffening threaded steel bar 323 is welded to the surface of the beam flange 321; one end of the steel beam is connected to the column head of the original section, and the other end extends into the lower concrete beam 41, and the beam flange 321 is welded to the longitudinal main reinforcement of the lower concrete beam 41 to enhance the shear strength of the lower concrete beam 41.

[0047] The steel structure enlarged column head 1, the steel structure reserved connection node 2, and the concrete structure embedded connection node 3 of the present invention serve as rigid supports for connecting the upper enlarged section column 5, the lower concrete structure 4, and the steel structure corridor or external heavy steel structure in the concrete structure tower, respectively. This transforms the traditional concrete structure column into a steel and concrete hybrid structure column, greatly enhancing the connection strength and mechanical properties of the structural column.

[0048] The enlarged cross-section steel-concrete connection node structure of the present invention is installed only on the column head of the concrete structure column at the connection position between the concrete structure and the steel structure, such as the top of the lower concrete column 43 in this embodiment. That is, it only needs to be installed on the side column corresponding to the floor connecting the concrete structure tower and the steel structure corridor, without the need for the entire floor column, which greatly avoids redundancy in structural mechanical performance.

[0049] The solution of this invention is a design solution formed by equivalent strength substitution after mechanical calculation of all-story stiffened steel columns and all-story large-section reinforced concrete columns. It can replace the traditional steel and concrete hybrid structure or large-section reinforced concrete column structure with all-story stiffened steel columns.

[0050] In this invention, the orientation of the steel structure reserved connection node 2 and the concrete structure embedded connection node 3 is not fixed. The specific orientation should be determined by the position of the lower concrete beam 41, the lower concrete shear wall 42 and the steel structure to which they are connected.

[0051] The assembly of the steel structure enlarged column head 1, the steel structure reserved connecting node 2 and the concrete structure embedded connecting node 3 is factory prefabrication and assembly, the node model is deepened through Tekla based on the BIM technology, the component parts are split and numbered, the steel structure enlarged column head 1 and the connecting structure can be welded and assembled in the factory, and welding operation is not needed on the construction site.

[0052] Based on the same inventive concept, the construction method of the enlarged section type steel-concrete connecting node structure provided by the present application comprises the following steps:

[0053] When the lower layer concrete structure 4 is constructed, the concrete structure reserved connecting node of the enlarged section type steel-concrete connecting node structure is embedded in the lower layer concrete structure 4.

[0054] The steel structure enlarged column head 1 connected with the steel structure reserved connecting node 2 is hoisted to the top of the lower layer concrete column 43, and the specific operation comprises the following steps: the cantilevered I-shaped steel provided on the lower layer concrete structure 4 is used as the basis of a support system, a disc buckle frame body is erected above the cantilevered I-shaped steel to serve as the support system, the steel structure enlarged column head 1 is hoisted to the support system by using a truck crane, accurate positioning is performed by using a total station, and fine adjustment of the steel structure enlarged column head 1 is performed by using an electric hoist; and the original section part of the column head of the steel structure enlarged column head 1 is connected with the concrete structure reserved connecting node.

[0055] The upper end of the longitudinal reinforcement of the lower layer concrete column 43 is inserted into the cavity of the original section part of the column head of the steel structure enlarged column head 1.

[0056] Part of the longitudinal reinforcement of the upper layer enlarged section column 5 is inserted into the cavity of the enlarged section part of the column head of the steel structure enlarged column head 1, and the other part of the longitudinal reinforcement is inserted into the cavity of the original section part of the column head and connected with the longitudinal reinforcement of the lower layer concrete column 43.

[0057] The concrete is poured into the cavity and vibrated and compacted.

[0058] The construction method of the present application specifically comprises the following steps:

[0059] During the steel bar binding process when the lower layer structure plate is constructed, the PVC sleeve pipe with a diameter of DN22 is embedded, and the longitudinal reinforcement of the lower layer structure plate is positioned and fixed. The shaped steel bar positioning device (such as a positioning sleeve) is sleeved on the longitudinal reinforcement (i.e. the longitudinal reinforcement) of the lower layer concrete column 43, so that the position of the longitudinal reinforcement is accurate and vertical, and then the floor concrete is poured, and it should be noted that early strength agent should be mixed in the two span ranges of the lower layer concrete column 43 where the conversion node is installed when the concrete is poured, so that the lower plate structure meets the load strength requirement of the upper support.

[0060] After the construction of the lower structure plate is completed, the horizontal I-beams are additionally arranged above the upper I-beams, the lower I-beams are arranged on the bottom of the lower concrete beams 41, the upper I-beams are formed into a "clamp" type reinforcement by using the elongated U-shaped anchors which bypass the lower I-beams, the strength of the anchoring end of the I-beam of the support system is strengthened, the disc buckle frame is arranged above the I-beams as the support system, the node is hoisted to the support system by using the truck crane, the accurate positioning is performed by using the total station, the fine adjustment of the connection node position is performed by using the electric hoist, and finally the positioning and installation are completed.

[0061] After the hoisting and installation of the connection node are completed, the longitudinal reinforcement is installed above the support frame, the longitudinal reinforcement of the lower concrete column 43 is inserted into the steel reinforcement reserved hole 121 of the horizontal partition plate 12 above the steel structure enlarged column head 1, the longitudinal reinforcement of the lower concrete column 43 which extends upwards below the support frame is mechanically connected with the longitudinal reinforcement of the upper enlarged section column 5 which penetrates through the reserved steel reinforcement hole of the horizontal partition plate 12 above, the longitudinal reinforcement in the cavity of the original section column head is connected one by one, and then the concrete is poured after acceptance, the concrete is poured and discharged from the circular discharge port 122 of the horizontal partition plate 12, it should be noted that the self-compacting concrete is used after the concrete is poured to the lower end of the steel structure enlarged column head 1, and the vibrating rod should be fully vibrated through the discharge port 122 of the horizontal partition plate 12 to ensure the pouring quality of the concrete at the node.

[0062] The application is aimed at the working conditions of the concrete structure tower connected with the steel structure corridor or heavy steel structure, and the connection of the non-traditional concrete column and the steel structure, in the structure performance, the enlarged section type concrete and steel structure connection conversion node structure strengthens the mechanical properties of the node itself compared with the traditional bracket structure, the high-efficiency connection is formed between the embedded connection node 3 of the concrete structure and the lower concrete structure 4, so that the overall safety of the concrete tower is improved; compared with the stiff column structure, the steel structure enlarged column head 1 greatly reduces the steel consumption, avoids the structural performance redundancy, avoids the complex process of on-site welding and installation through the deepening prefabrication processing based on BIM, guarantees the construction quality and improves the construction efficiency. Meanwhile, the application mainly adopts the standardized and recyclable construction method, so that the construction is more simple, convenient and efficient, and the green and low-carbon construction concept is highlighted.

[0063] The above is only the preferred embodiment of the application, the protection scope of the application is not limited to the above-mentioned embodiments, and any technical scheme falling within the idea of the application belongs to the protection scope of the application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and decorations without departing from the principle of the application also belong to the protection scope of the application.

Claims

1. An enlarged cross-section steel-concrete joint structure, characterized in that, Comprise: The steel structure enlarged column head, the steel structure reserved connecting node and the concrete structure reserved connecting node; The steel structure enlarged column head is arranged between the lower concrete column and the upper enlarged section column; The steel structure enlarged column head comprises an enlarged section part column head and an original section part column head; the original section part column head is connected with the concrete structure reserved connecting node, which is used for connecting with the lower concrete structure; the enlarged section part column head is connected with the steel structure reserved connecting node, which is used for connecting with the external steel structure; The enlarged section part column head and the original section part column head are respectively provided with cavities for pouring concrete; the upper end of the longitudinal steel bar of the lower concrete column is inserted into the cavity of the original section part column head; a part of the longitudinal steel bar of the upper enlarged section column is inserted into the cavity of the enlarged section part column head, and another part of the longitudinal steel bar is inserted into the cavity of the original section part column head and connected with the longitudinal steel bar of the lower concrete column.

2. A reinforced section steel-concrete connection joint structure according to claim 1, characterized in that, The steel structure enlarged column head comprises a wall plate, a longitudinal partition plate and a bottom sealing plate; the wall plate encloses the cavity which longitudinally penetrates along the circumference of the upper enlarged section column; the longitudinal partition plate is arranged in the cavity to divide the cavity into an original section cavity and an enlarged section cavity; the bottom sealing plate seals the bottom of the enlarged section cavity.

3. A reinforced section steel-concrete connection joint structure according to claim 2, characterized in that, The steel structure enlarged column head further comprises a transverse partition plate; the original section cavity and the enlarged section cavity are respectively provided with the transverse partition plate; the transverse partition plate is provided with a steel bar reserved hole and a discharging port.

4. A reinforced section steel-concrete connection joint structure according to claim 3, characterized in that, The transverse partition plate is connected with a stiffened rib plate; the stiffened rib plate is further connected with the wall plate or the longitudinal partition plate.

5. A reinforced section steel-concrete connection joint structure according to claim 3, wherein The original section cavity and the enlarged section cavity are respectively provided with at least two transverse partition plates which are longitudinally spaced to divide the original section cavity and the enlarged section cavity into multiple sub-cavities.

6. A reinforced section steel-concrete connection joint structure according to claim 1, wherein The steel structure reserved connecting node comprises a chord reserved node and a floor slab steel beam reserved node; the floor slab steel beam reserved node is provided with a stud.

7. The enlarged cross-section steel-concrete connection joint structure according to claim 1, characterized in that, The lower concrete structure comprises a lower concrete shear wall; the concrete structure reserved connecting node comprises a comb plate; the comb plate is composed of multiple steel plates which are equidistantly arranged longitudinally; one end of the comb plate is connected with the original section part column head, and the other end is arranged in the lower concrete shear wall.

8. A reinforced section steel-concrete connection joint structure according to claim 1, characterized in that, The lower concrete structure comprises a lower concrete beam; the concrete structure reserved connecting node comprises a concrete beam embedded node; the concrete beam embedded node comprises a steel beam and a stiffened threaded steel bar; the steel beam comprises a beam web plate and a beam wing plate; the stiffened threaded steel bar is welded on the plate surface of the beam wing plate; one end of the steel beam is connected with the original section part column head, and the other end is arranged in the lower concrete beam.

9. A construction method of the enlarged cross-section type steel-concrete joint structure according to claim 1, characterized by, The steps comprise: When the lower concrete structure is constructed, the concrete structure reserved connecting node of the enlarged section steel-concrete connecting node structure is embedded in the lower concrete structure; The steel structure enlarged column head connected with the steel structure reserved connecting node is hoisted to the top of the lower concrete column; inserting the upper end of the longitudinal steel bars of the lower concrete column into the cavity of the original section part of the steel structure enlarged column head; inserting a part of the longitudinal steel bars of the upper enlarged section column into the cavity of the enlarged section part of the steel structure enlarged column head, and inserting another part of the longitudinal steel bars into the cavity of the original section part and connecting with the longitudinal steel bars of the lower concrete column; pouring concrete into the cavity and vibrating and compacting.

10. The construction method according to claim 9, characterized in that, The step of hoisting the steel structure enlarged column head connected with the steel structure reserved connecting joint to the top of the lower concrete column comprises: using the cantilevered I-beam arranged on the lower concrete structure as the basis of the support system, erecting a disc buckle frame body above the cantilevered I-beam as the support system; hoisting the steel structure enlarged column head to the support system by using a car hoist, accurately positioning by using a total station, and finely adjusting the steel structure enlarged column head by using an electric hoist; connecting the original section part of the steel structure enlarged column head with the concrete structure reserved connecting joint.

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