A steel structure concrete combined assembled subway platform structure and construction method

Abstract

The present invention is a steel structure concrete combined assembled subway platform structure and construction method, the structure includes a station foundation concrete floor, prefabricated steel columns, prefabricated steel beams, and prefabricated concrete platform slabs; the construction sequence is: first, cast the subway station foundation concrete floor, reserve grooves at the positions of the prefabricated steel columns on the station foundation concrete floor, and simultaneously perform maintenance on the station foundation concrete floor; secondly, assemble the prefabricated steel columns on site, insert the prefabricated steel columns as a whole into the reserved grooves and temporarily fix them, and pour concrete into the grooves to achieve a stable connection between the steel columns and the station foundation concrete floor. Next, hoist the prefabricated steel beams, connect them to the prefabricated steel columns with bolts, then set up the prefabricated concrete platform slabs, and finally fill in the prefabricated beam-slab connection nodes. The present invention has good integrity and good seismic performance, and the assembled platform uses prefabricated components for on-site assembly, and the installation speed is fast, which can effectively shorten the construction period and improve construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated construction of subway stations, and in particular to a steel structure concrete combined prefabricated subway platform structure and a construction method. Background Art

[0002] With the acceleration of urbanization and the growth of traffic demand, the construction scale and speed of subways, as an important part of urban rapid public transportation systems, are also expanding. The traditional subway station construction method can no longer meet the needs of modern urban development due to problems such as long construction period and great impact on the surrounding environment. In this context, prefabricated subway station technology came into being and became a research hotspot and development trend in the field of subway construction.

[0003] Prefabricated subway stations are built by assembling prefabricated components, which have the advantages of fast construction speed, low environmental pollution, energy saving and environmental protection. Compared with traditional cast-in-place construction methods, prefabricated subway stations can avoid the need to set up formwork supports and concrete curing, greatly shorten the construction period, and reduce interference with urban traffic and citizens' lives. At the same time, the production of prefabricated components is carried out in the factory, which can achieve standardized and modular production and improve the quality of the project.

[0004] However, the construction of prefabricated subway stations also faces some technical challenges. For example, the connection and fixation of prefabricated components require high precision and high strength to ensure the stability and safety of the station structure. In addition, the seismic performance and durability of prefabricated subway stations are also important issues that need to be paid attention to. Summary of the invention

[0005] The present invention aims to conduct in-depth research on technical issues in structural design, prefabricated component manufacturing, construction technology, etc. of prefabricated subway stations, improve their comprehensive performance, provide strong support for the sustainable development of cities, and provide a steel structure concrete combined prefabricated subway platform structure and construction method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A steel structure concrete combined assembled subway platform structure, comprising prefabricated steel columns, prefabricated steel beams, prefabricated concrete platform slabs and station foundation concrete bottom slabs;

[0008] The prefabricated steel columns include a lower prefabricated steel column, a middle prefabricated steel column and an upper prefabricated steel column which are connected in sequence from bottom to top. The lower prefabricated steel column is connected to the concrete bottom plate of the station foundation. Four side walls of the middle prefabricated steel column are externally installed with shock absorbing dampers. The upper ends of the four side walls of the upper prefabricated steel column are provided with annular I-beams. Ring beam extension plates are provided at both ends of the top of the annular I-beam along the plate span direction. Ring beam extension plate bolt holes are reserved on the ring beam extension plates. A plurality of ring beam bolt holes are opened on the web of the annular I-beam corresponding to the ring beam extension plate. A plurality of ring beam rivets are provided at both ends of the top of the annular I-beam perpendicular to the plate span direction.

[0009] The prefabricated steel beam includes an I-shaped steel beam, a steel beam extension plate is provided on the top of the I-shaped steel beam, a plurality of steel beam bolt holes are provided at both ends of the web of the I-shaped steel beam, and a plurality of steel beam extension plate bolt holes are provided on the steel beam extension plate; the web of the I-shaped steel beam is butted with the web of the annular I-shaped beam, the steel beam extension plate is butted with the ring beam extension plate, and the steel beam bolt holes are fixedly connected with the ring beam bolt holes through beam-column connecting plates and beam-column node bolts;

[0010] The precast concrete platform slabs include first-type precast concrete slabs and second-type precast concrete slabs. The first-type precast concrete slabs are erected on the top of the I-shaped steel beam and fixedly connected to the steel beam extension plate, and the second-type precast concrete slabs are erected on the top of the annular I-shaped beam and fixedly connected to the annular beam rivets.

[0011] A number of column bottom rivets are arranged on the four side walls of the lower prefabricated steel column.

[0012] A middle-layer steel column bottom plate is provided at the bottom of the middle-layer prefabricated steel column and a middle-layer steel column top plate is provided at the top. The top of the lower-layer prefabricated steel column is welded to the bottom of the middle-layer steel column bottom plate. The four corners of the middle-layer steel column top plate are penetrated by first connecting holes. Two first stiffening plates are provided between each side wall of the middle-layer prefabricated steel column and the middle-layer steel column bottom plate and the middle-layer steel column top plate.

[0013] An upper steel column base plate is provided at the bottom of the upper prefabricated steel column, and second connecting holes are penetrated at the four corners of the upper steel column base plate. The first connecting hole and the second connecting hole are arranged in one-to-one correspondence and are fixedly connected by bolt pads, column connecting nuts and screws. Two second stiffening plates are provided between the upper steel column base plates of each side wall of the upper prefabricated steel column.

[0014] The upper and lower ends of the shock-absorbing damper are provided with pin plates, and each pin plate is provided with ear plates on both sides. The ear plates are fixed to the corresponding middle steel column bottom plate or middle steel column top plate, and the pin plates and ear plates are connected by pins.

[0015] The lower-layer prefabricated steel columns, the middle-layer prefabricated steel columns and the upper-layer prefabricated steel columns are all square steel tube structures.

[0016] A splicing groove is provided at one end where the top of the first type of precast concrete slab is connected to the steel beam extension plate. An embedded angle steel is provided in the splicing groove. The embedded angle steel is provided with a number of angle steel reserved holes. The angle steel reserved holes and the bolt holes of the steel beam extension plate are fixedly connected by beam-slab connecting screws and beam-slab connecting nuts.

[0017] The second type of precast concrete slabs have a plurality of reserved holes for the concrete slabs at both ends, and the reserved holes for the concrete slabs are inserted on the ring beam rivets.

[0018] The above-mentioned construction method of a steel structure concrete combined assembled subway platform structure comprises the following specific steps:

[0019] S1. Assembly of prefabricated steel columns:

[0020] The lower prefabricated steel columns, the middle prefabricated steel columns and the upper prefabricated steel columns are all prefabricated in the factory. The lower prefabricated steel columns and the middle prefabricated steel columns are processed into an integrated structure in the factory. The shock-absorbing dampers are installed on the side walls of the middle prefabricated steel columns. Then, the upper prefabricated steel columns are installed on the top of the middle prefabricated steel columns through bolt pads, column connecting nuts and screws. Two column connecting nuts are provided on each side. After the tightening is completed, the tightening torque is tested on site to ensure the installation quality and safety performance of the prefabricated steel columns.

[0021] S2. Pouring of station foundation concrete slab:

[0022] When pouring the concrete slab of the station foundation, a groove is reserved at the position corresponding to each prefabricated steel column, and the surface of the groove and its surroundings are leveled;

[0023] S3. Connection between station foundation concrete slab and prefabricated steel columns:

[0024] Insert the prefabricated steel column into the groove of the station foundation concrete slab, so that the upper surface of the middle steel column slab is flush with the top of the station foundation concrete slab, and take corresponding measures to perform positioning and setting out, such as using anchor bolts to assist in positioning and setting out. After the prefabricated steel column is set out and temporarily fixed, fill the groove with concrete and vibrate it to make it dense, so as to firmly connect the station foundation concrete slab and the prefabricated steel column;

[0025] S4. Installation of prefabricated steel beams:

[0026] Before installing the prefabricated steel beam, accurate positioning is required. First, the prefabricated steel beam is lifted as a whole to between two prefabricated steel columns using jacking equipment. The web of the I-shaped steel beam is butted with the web of the annular I-shaped beam, and the steel beam extension plate is butted with the ring beam extension plate. The beam-column connecting plates are placed at both ends of the prefabricated steel beam, and the beam-column node bolts are inserted into the steel beam bolt holes and the ring beam bolt holes. The jacking equipment ensures the stability of the prefabricated steel beam before installation. During jacking, the beam-column node nuts on both sides of the prefabricated steel beam are tightened. After tightening, check whether the tightening torque meets the tightening requirements. After the inspection is completed, the jacking equipment releases the prefabricated steel beam and continues to complete the jacking installation of the remaining prefabricated steel beams.

[0027] S5. Laying of precast concrete platform slabs:

[0028] The first type of precast concrete slabs are erected on the precast steel beams at both ends, and the beam-slab connecting screws are first inserted into the bolt holes of the ring beam extension plate and the bolt holes of the steel beam extension plate, and then inserted into the reserved holes of the angle steel, and then the beam-slab connecting nuts are tightened; when the second type of precast concrete slabs are hoisted, the reserved holes of the concrete slabs are aligned with the ring beam rivets, and the second type of precast concrete slabs are dropped onto the annular I-beams; after all the precast concrete platform slabs are installed in place, concrete is filled into the splicing grooves of the first type of precast concrete slabs and precast steel beams, vibrated and compacted, and smoothed, and grouting materials are filled into the reserved holes of the concrete slabs at both ends of the second type of precast concrete slabs to achieve a stable connection between the second type of precast concrete slabs and the annular I-beams, and finally epoxy resin treatment agents or polyurethane treatment agents are used to fill the gaps in the precast concrete platform slabs to improve the integrity of the structure;

[0029] S6. Post-processing:

[0030] When all components are constructed, the prefabricated steel columns and prefabricated steel beams are painted under appropriate temperature and humidity conditions.

[0031] The beneficial effects of the present invention are as follows: the various components of the structural system of the present invention are connected into a whole by bolt connection, welding connection and grouting connection, and have the advantages of good integrity and good seismic performance. The prefabricated platform adopts prefabricated components for on-site assembly, and the installation speed is fast, which can effectively shorten the construction period, improve construction efficiency, reduce the demand for concrete on site, avoid the erection of formwork supports, reduce the amount of wet work, reduce material consumption costs and labor costs, and achieve better economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the steel structure concrete combined assembled subway platform structure in the present invention;

[0033] Figure 2 It is a structural schematic diagram of the prefabricated steel column in the present invention;

[0034] Figure 3It is an exploded schematic diagram of the prefabricated steel column in the present invention;

[0035] Figure 4 It is an exploded schematic diagram of the lower layer prefabricated steel column and the middle layer prefabricated steel column of the present invention;

[0036] Figure 5 It is a structural schematic diagram of the prefabricated steel beam in the present invention;

[0037] Figure 6 It is a structural schematic diagram of the precast concrete platform slab in the present invention;

[0038] Figure 7 It is a schematic diagram of the connection between the prefabricated steel column and the station foundation concrete bottom plate in the present invention;

[0039] Figure 8 It is a schematic diagram of the connection between the prefabricated steel column and the prefabricated steel beam in the present invention;

[0040] Fig. 9 It is a schematic diagram of the connection between the prefabricated steel column, the prefabricated steel beam and the first type of prefabricated concrete slab in the present invention;

[0041] Fig.10 It is a schematic diagram of the connection between the prefabricated steel column and the second type of prefabricated concrete slab in the present invention;

[0042] In the figure: 1-prefabricated steel column; 2-prefabricated steel beam; 3-prefabricated concrete platform slab; 4-station foundation concrete bottom slab; 5-beam-column connecting plate; 6-beam-column node bolt; 7-bolt pad; 8-column connecting nut; 9-screw;

[0043] 11-lower prefabricated steel column; 12-middle prefabricated steel column; 13-upper prefabricated steel column; 14-shock absorber; 15-annular I-beam; 16-ring beam extension plate; 17-ring beam extension plate bolt hole; 18-ring beam bolt hole; 19-ring beam rivet;

[0044] 111-column bottom rivet;

[0045] 121-middle layer steel column bottom plate; 122-middle layer steel column top plate; 123-first connection hole; 124-first stiffening plate;

[0046] 131-upper steel column bottom plate; 132-second connection hole; 133-second stiffening plate;

[0047] 141-pin plate; 142-ear plate; 143-pin;

[0048] 21-I-shaped steel beam; 22-steel beam extension plate; 23-steel beam bolt hole; 24-steel beam extension plate bolt hole;

[0049] 31-First category precast concrete slab; 32-Second category precast concrete slab;

[0050] 311-joining groove; 312-embedded angle steel; 313-reserved hole of angle steel; 314-beam-slab connecting screw; 315-beam-slab connecting nut;

[0051] 321-Pre-reserved holes for concrete slabs;

[0052] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0054] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0057] The present invention discloses a steel structure concrete combined assembled subway platform structure and construction method. Except for the foundation slab, all components of the structural system can be prefabricated in a factory and assembled on site, avoiding the need to set up formwork support frames, greatly reducing the workload of on-site wet operations, and having multiple advantages such as high construction precision, short construction period, and small impact on the environment.

[0058] Due to the large length of the subway station structure, the attached figure cannot fully display it. Figure 1 Only two spans are shown for illustration. The subway station consists of multiple Figure 1The structural system shown is connected along the length of the steel beams.

[0059] The steel structure concrete composite assembled subway station platform structure shall include prefabricated steel columns 1, prefabricated steel beams 2, prefabricated concrete platform slabs 3, and station foundation concrete bottom slabs 4.

[0060] like Figures 2 to 4 As shown, the prefabricated steel column 1 includes a lower prefabricated steel column 11, a middle prefabricated steel column 12 and an upper prefabricated steel column 13 which are sequentially connected from bottom to top, and the lower prefabricated steel column 11, the middle prefabricated steel column 12 and the upper prefabricated steel column 13 adopt a square steel tube structure.

[0061] The lower prefabricated steel column 11 is connected to the middle prefabricated steel column 12 by welding. Two rows of column bottom rivets 111 are arranged on the side walls around the lower prefabricated steel column 11 to increase the anchoring force when the outer concrete is poured. The column bottom rivets 111 are welded to the lower prefabricated steel column 11.

[0062] A horizontal steel plate is welded on the upper and lower sides of the middle-layer prefabricated steel column 12, which are a middle-layer steel column bottom plate 121 and a middle-layer steel column top plate 122. The first connecting holes 123 are reserved at the four corners of the upper middle-layer steel column top plate 122. Secondly, two pairs of first stiffening plates 124, a shock-absorbing damper 14 and two pairs of ear plates 142 are arranged on the upper and lower side walls around the middle-layer prefabricated steel column 12. The first stiffening plate 124 is connected to the middle-layer prefabricated steel column 12 by welding. The upper and lower ends of the shock-absorbing damper 14 are provided with a pin plate 141. The pin plate 141 is connected to the middle-layer prefabricated steel column 12 through the ear plate 142 and the pin 143 to resist earthquake action.

[0063] The shock absorbing damper 14 can effectively eliminate part of the earthquake effect, reduce the adverse effect of the earthquake effect on the structure, and enhance the earthquake resistance and safety performance of the structure.

[0064] After the connection between the lower prefabricated steel column 11 and the middle prefabricated steel column 12 is completed, the upper prefabricated steel column 13 is then installed. A horizontal steel plate, namely, the upper steel column bottom plate 131, is provided at the bottom of the upper prefabricated steel column 13. Second connection holes 132 are reserved at the four corners of the upper steel column bottom plate 131. The upper steel column bottom plate 131 is welded to the upper prefabricated steel column 13. Two pairs of second stiffening plates 133 are arranged around the lower side of the upper prefabricated steel column 13 and are welded to the upper prefabricated steel column 13. A circular I-beam 15 is provided at the top of the upper prefabricated steel column 13, which is welded to the upper prefabricated steel column 13. A ring beam extension plate 16 is provided at the top of the circular I-beam 15 along the plate span direction (short side direction). The ring beam extension plate 16 has reserved ring beam extension plate bolt holes 17. A ring beam rivet 19 is provided at the top of the circular I-beam 15 perpendicular to the plate span direction (long side direction), which is welded to the circular I-beam 15. After aligning all the first connection holes 123 and the second connection holes 132 of the middle-layer prefabricated steel columns 12 and the upper-layer prefabricated steel columns 13, insert the screw rod 9, then insert the bolt pads 7 on the upper and lower sides of the screw rod 9 respectively, and finally tighten the column connecting nuts 8. Two column connecting nuts 8 are provided on each side to prevent the structure from loosening under long-term vibration. After tightening, the tightening torque is tested on site to ensure the installation quality and safety performance of the prefabricated steel columns 1.

[0065] like Figure 5 As shown, the prefabricated steel beam 2 includes an I-shaped steel beam 21, a steel beam extension plate 22 is provided on the top of the I-shaped steel beam 21, a plurality of steel beam bolt holes 23 are provided at both ends of the web of the I-shaped steel beam 21, and a plurality of steel beam extension plate bolt holes 24 are provided on the steel beam extension plate 22; the web of the I-shaped steel beam 21 is butt-jointed with the web of the annular I-shaped beam 15, the steel beam extension plate 22 is butt-jointed with the ring beam extension plate 16, and the steel beam bolt holes 23 are fixedly connected with the ring beam bolt holes 18 through the beam-column connecting plate 5 and the beam-column node bolts 6.

[0066] like Figure 6 As shown, the precast concrete platform slab 3 includes a first type of precast concrete slab 31 and a second type of precast concrete slab 32. The first type of precast concrete slab 31 is erected on the top of the I-shaped steel beam 21 and is fixedly connected to the steel beam extension plate 22. The second type of precast concrete slab 32 is erected on the top of the annular I-shaped beam 15 and is fixedly connected to the ring beam rivet 19.

[0067] A splicing groove 311 is provided at one end of the top of the first type precast concrete slab 31 which is connected to the steel beam extension plate 22. An embedded angle steel 312 is provided in the splicing groove 311. The embedded angle steel 312 is provided with a plurality of angle steel reserved holes 313. The angle steel reserved holes 313 and the steel beam extension plate bolt holes 24 are fixedly connected by beam-slab connecting screws 314 and beam-slab connecting nuts 315.

[0068] The cross-sectional shape of the first type of precast concrete slab 31 is a "convex" shape.

[0069] A plurality of concrete slab reserved holes 321 are penetrated at both ends of the second type precast concrete slab 32 , and the concrete slab reserved holes 321 are inserted into the ring beam rivets 19 .

[0070] The second type of precast concrete slab 32 has a rectangular cross-section and does not require slotting.

[0071] like Figure 7 As shown, when pouring the station foundation concrete slab 4, a groove is reserved at the position of each prefabricated steel column 1, and the surface of the groove and the surroundings are flattened. The prefabricated steel column 1 is inserted into the groove, and the upper surface of the middle steel column bottom plate 121 is flush with the top of the station foundation concrete slab 4. Appropriate measures are taken to position and lay out (such as using anchor bolts to assist in positioning). After the prefabricated steel column 1 is laid out and temporarily fixed, concrete is filled into the groove and vibrated to make it dense, so that the station foundation concrete slab 4 and the prefabricated steel column 1 are firmly connected.

[0072] After the prefabricated steel column 1 and the station foundation concrete bottom plate 4 are completed, the next step is to install the prefabricated steel beam 2. Figure 8 As shown. Before installing the prefabricated steel beam 2, it needs to be accurately positioned. First, the prefabricated steel beam 2 is lifted as a whole between the two prefabricated steel columns 1 by using a jacking device. Since the ring beam bolt holes 18 are prefabricated in the factory for the annular I-beam 15, and the steel beam bolt holes 23 are also reserved at both ends of the prefabricated steel beam 2, the splicing of the prefabricated steel column 1 and the prefabricated steel beam 2 is very convenient. The beam-column connecting plates 5 are placed at both ends of the prefabricated steel beam 2 (two on each side, a total of four), and the beam-column node bolts 6 are inserted into the ring beam bolt holes 18 and the steel beam bolt holes 23. The jacking device ensures the stability of the prefabricated steel beam 2 before installation. During jacking, the beam-column node nuts on both sides of the prefabricated steel beam 2 can be tightened. After tightening, check whether the tightening torque meets the tightening requirements. After the inspection is completed, the jacking device releases the prefabricated steel beam 2 and continues to complete the jacking installation of the remaining steel beams.

[0073] After the prefabricated steel beams 2 are installed, the prefabricated concrete platform slabs 3 are finally laid. Figure 9-10As shown. The precast concrete platform slab 3 is divided into a first type of precast concrete slab 301 and a second type of precast concrete slab 302. The first type of precast concrete slab 301 is connected to the precast steel beam 2 (joining grooves 311 need to be opened on both sides and angle steels 312 need to be embedded), and the second type of precast concrete slab 302 is connected to the annular I-beam 15 (through the reserved holes 321 of the concrete slab). The first type of precast concrete slab 31 is placed on the precast steel beam 2 at both ends, and the beam-slab connecting screw 314 is first inserted into the bolt hole 24 of the steel beam extension plate, and then inserted into the reserved hole 313 of the angle steel, and then the beam-slab connecting nut 315 is tightened. When the second type of precast concrete slab 32 is hoisted, the reserved hole 321 of the concrete slab is aligned with the ring beam rivet 19, and the second type of precast concrete slab 32 is dropped onto the annular I-beam 15. The ring beam rivet 19 can limit the horizontal movement of the second type of precast concrete slab 32. After all the precast concrete platform slabs 3 are installed in place, concrete is poured into the joint grooves 311 of the first type precast concrete slabs 31 and the precast steel beams 2 and vibrated to make them dense, the surface is smoothed, and grouting material is filled into the reserved holes 321 of the concrete slabs at both ends of the second type precast concrete slabs 32 to achieve a stable connection between the second type precast concrete slabs 32 and the annular I-beams 15. Finally, epoxy resin treatment agent or polyurethane treatment agent is used to fill the gaps in the precast concrete platform slabs 3, thereby improving the integrity of the structure.

[0074] When all components are constructed, the prefabricated steel columns 1 and prefabricated steel beams 2 are painted under suitable temperature and humidity conditions to protect the steel structure from corrosion, oxidation and environmental factors in the underground humid environment, which can significantly extend the service life of the steel structure.

[0075] The various components of the structural system of the present invention are connected into a whole by bolt connection, welding connection and grouting connection, etc., and have the advantages of good integrity and good seismic performance. The prefabricated platform adopts prefabricated components for on-site assembly, and the installation speed is fast, which can effectively shorten the construction period, improve construction efficiency, reduce the demand for concrete on site, avoid setting up formwork supports, reduce wet work volume, reduce material consumption costs and labor costs, achieve better economic benefits, and is a building structure form with development potential.

[0076] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A steel structure concrete combined assembled subway platform structure, characterized in that: It includes prefabricated steel columns (1), prefabricated steel beams (2), prefabricated concrete platform slabs (3) and station foundation concrete bottom slabs (4); The prefabricated steel column (1) comprises a lower prefabricated steel column (11), a middle prefabricated steel column (12) and an upper prefabricated steel column (13) which are connected in sequence from bottom to top, the lower prefabricated steel column (11) being connected to the station foundation concrete bottom plate (4), four side walls of the middle prefabricated steel column (12) being externally mounted with shock absorbing dampers (14), the upper ends of the four side walls of the upper prefabricated steel column (13) being provided with an annular I-beam (15), the top ends of the annular I-beam (15) being provided with annular beam extension plates (16) along the plate span direction, the ring beam extension plates (16) being provided with ring beam extension plate bolt holes (17), the web of the annular I-beam (15) corresponding to the ring beam extension plates (16) being provided with a plurality of ring beam bolt holes (18), and the top ends of the annular I-beam (15) being provided with a plurality of ring beam rivets (19) perpendicular to the plate span direction; The prefabricated steel beam (2) comprises an I-shaped steel beam (21), a steel beam extension plate (22) is provided on the top of the I-shaped steel beam (21), a plurality of steel beam bolt holes (23) are provided at both ends of the web of the I-shaped steel beam (21), and a plurality of steel beam extension plate bolt holes (24) are provided on the steel beam extension plate (22); the web of the I-shaped steel beam (21) is butted with the web of the annular I-shaped beam (15), the steel beam extension plate (22) is butted with the ring beam extension plate (16), and the steel beam bolt holes (23) are fixedly connected with the ring beam bolt holes (18) via beam-column connecting plates (5) and beam-column node bolts (6); The precast concrete platform slab (3) comprises a first type of precast concrete slab (31) and a second type of precast concrete slab (32). The first type of precast concrete slab (31) is mounted on the top of an I-shaped steel beam (21) and is fixedly connected to the steel beam extension plate (22). The second type of precast concrete slab (32) is mounted on the top of an annular I-shaped beam (15) and is fixedly connected to the annular beam rivet (19).

2. The steel structure concrete combined assembled subway platform structure according to claim 1 is characterized in that: A plurality of column bottom rivets (111) are provided on four side walls of the lower prefabricated steel column (11).

3. The steel structure concrete combined assembled subway platform structure according to claim 2 is characterized in that: The middle prefabricated steel column (12) is provided with a middle steel column bottom plate (121) at the bottom and a middle steel column top plate (122) at the top, the top of the lower prefabricated steel column (11) is welded to the bottom of the middle steel column bottom plate (121), the four corners of the middle steel column top plate (122) are penetrated by first connection holes (123), and two first stiffening plates (124) are provided between each side wall of the middle prefabricated steel column (12) and the middle steel column bottom plate (121) and the middle steel column top plate (122).

4. The steel structure concrete combined assembled subway platform structure according to claim 3 is characterized in that: An upper steel column bottom plate (131) is provided at the bottom of the upper prefabricated steel column (13); second connection holes (132) are passed through four corners of the upper steel column bottom plate (131); the first connection holes (123) and the second connection holes (132) are arranged in a one-to-one correspondence and are fixedly connected by bolt pads (7), column connection nuts (8), and screw rods (9); and two second stiffening plates (133) are provided between the upper steel column bottom plates (131) of each side wall of the upper prefabricated steel column (13).

5. The steel structure concrete combined assembled subway platform structure according to claim 4 is characterized in that: The upper and lower ends of the shock absorbing damper (14) are both provided with a pin plate (141), and both sides of each pin plate (141) are provided with an ear plate (142), and the ear plate (142) is fixed on the corresponding middle steel column bottom plate (121) or middle steel column top plate (122), and the pin plate (141) and the ear plate (142) are connected by a pin (143).

6. The steel structure concrete combined assembled subway platform structure according to claim 5, characterized in that: The lower prefabricated steel columns (11), the middle prefabricated steel columns (12) and the upper prefabricated steel columns (13) are all square steel tube structures.

7. The steel structure concrete combined assembled subway platform structure according to claim 6, characterized in that: A splicing groove (311) is provided at one end of the top of the first type precast concrete slab (31) connected to the steel beam extension slab (22), a pre-embedded angle steel (312) is provided in the splicing groove (311), a plurality of angle steel reserved holes (313) are provided on the pre-embedded angle steel (312), and the angle steel reserved holes (313) are fixedly connected to the steel beam extension slab bolt holes (24) via beam-slab connecting screws (314) and beam-slab connecting nuts (315).

8. The steel structure concrete combined assembled subway platform structure according to claim 7 is characterized in that: A plurality of concrete slab reserved holes (321) are penetrated at both ends of the second type precast concrete slab (32), and the concrete slab reserved holes (321) are inserted into the ring beam rivets (19).

9. The construction method of a steel structure concrete combined assembled subway platform structure according to claim 8, characterized in that: The specific steps are: S1. Assembly of prefabricated steel columns (1): The lower prefabricated steel column (11), the middle prefabricated steel column (12) and the upper prefabricated steel column (13) are all prefabricated in a factory. The lower prefabricated steel column (11) and the middle prefabricated steel column (12) are processed into an integrated structure in the factory. The side wall of the middle prefabricated steel column (12) is equipped with a shock-absorbing damper (14). Then, the upper prefabricated steel column (13) is installed on the top of the middle prefabricated steel column (12) through a bolt pad (7), a column connecting nut (8) and a screw rod (9). Two column connecting nuts (8) are provided on each side. After the tightening is completed, the tightening torque is tested on site to ensure the installation quality and safety performance of the prefabricated steel column (1). S2. Casting of station foundation concrete slab (4): When pouring the station foundation concrete slab (4), a groove is reserved at the position corresponding to each prefabricated steel column (1), and the surface of the groove and the surrounding area are leveled; S3. Connection between the station foundation concrete slab (4) and the prefabricated steel column (1): Insert the prefabricated steel column (1) into the groove of the station foundation concrete bottom plate (4), so that the upper surface of the middle steel column bottom plate (121) is flush with the top of the station foundation concrete bottom plate (4), and take corresponding measures to perform positioning and setting out. After the prefabricated steel column (1) is set out and temporarily fixed, fill the groove with concrete and vibrate it to make it dense, so that the station foundation concrete bottom plate (4) and the prefabricated steel column (1) are firmly connected; S4. Installation of prefabricated steel beams (2): Before installing the prefabricated steel beam (2), accurate positioning is required. First, the prefabricated steel beam (2) is lifted as a whole to between the two prefabricated steel columns (1) using a jacking device. The web of the I-shaped steel beam (21) is butted with the web of the annular I-shaped beam (15), and the steel beam extension plate (22) is butted with the ring beam extension plate (16). The beam-column connecting plate (5) is placed at both ends of the prefabricated steel beam (2). The beam-column node bolts (6) are inserted into the steel beam bolt holes (23) and the ring beam bolt holes (18). The jacking device ensures the stability of the prefabricated steel beam (2) before installation. During jacking, the beam-column node nuts on both sides of the prefabricated steel beam (2) are tightened. After tightening, check whether the tightening torque meets the tightening requirements. After the inspection is completed, the jacking device releases the prefabricated steel beam (2) and continues to complete the jacking installation of the remaining prefabricated steel beams (2); S5. Laying of precast concrete platform slab (3): The first type of precast concrete slab (31) is placed on the precast steel beam (2) at both ends, and the beam-slab connection screw (314) is first inserted into the bolt hole (17) of the ring beam extension plate and the bolt hole (24) of the steel beam extension plate, and then inserted into the angle steel reserved hole (313), and then the beam-slab connection nut (315) is tightened; when the second type of precast concrete slab (32) is hoisted, the reserved hole (321) of the concrete slab is aligned with the ring beam rivet (19), and the second type of precast concrete slab (32) is dropped onto the annular I-beam (15); after all the precast concrete slabs are hoisted, the precast concrete slab is placed on the annular I-beam (15); and the precast concrete slab is placed on the annular I-beam (15). After the precast concrete platform slab (3) is installed in place, concrete is poured into the joint groove (311) of the first type precast concrete slab (31) and the precast steel beam (2) and vibrated to make it dense and smooth. Grouting material is poured into the reserved holes (321) of the concrete slab at both ends of the second type precast concrete slab (32) to achieve a stable connection between the second type precast concrete slab (32) and the annular I-beam (15). Finally, an epoxy resin treatment agent or a polyurethane treatment agent is used to fill the gap of the precast concrete platform slab (3) to improve the integrity of the structure. S6. Post-processing: After all components have been constructed, the prefabricated steel columns (1) and prefabricated steel beams (2) are painted under suitable temperature and humidity conditions.

10. The construction method of a steel structure concrete combined assembled subway platform structure according to claim 9, characterized in that: In step S3, anchor bolts are used to assist positioning and layout.

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