Combined type steel stair structure capable of preventing hollowing and cracking and construction method of combined type steel stair structure

Abstract

The invention discloses an anti-hollowing and anti-cracking combined steel stair structure and a construction method thereof. The anti-hollowing and anti-cracking combined steel stair structure comprises a platform plate and stair modules, the stair modules are connected between the ground and the platform plates or between the upper and lower adjacent platform plates; each stair module comprises a stair bottom plate, side plates, a steel mesh and face bricks; the stair bottom plate is in a step shape and comprises step plate sections and vertical face plate sections, and the top edges of the vertical face plate sections exceed the top faces of the corresponding step plate sections. The side plates are connected to the two sides of the stair bottom plate correspondingly. The parts, exceeding the top surfaces of the corresponding step plate sections, of the vertical panel sections, the step plate sections and the side plates on the two sides jointly form grooves; the steel mesh is mounted in the groove; a bonding layer is arranged in the groove; the face bricks are paved on the top surface of the bonding layer; the surface of the vertical panel section is coated with a coating; the step plate section on the uppermost side is connected with the platform plate on the corresponding side; and the vertical panel section on the lowermost side is connected with the platform plate on the corresponding side or the ground. The problems that hollowing and cracking are easily caused by a traditional steel structure stair are solved; the construction process is complicated; and the bonding reliability of face bricks is poor.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering, in particular to a combined steel staircase structure to prevent hollow drum cracking and a construction method thereof. Background Art

[0002] In the construction of steel structure stairs, the traditional practice usually requires wrapping a layer of reinforced concrete on the facade and plane of the steel staircase steps before laying the tiles. Although this practice can ensure the adhesion of the tiles, it has a high hollowing rate: the difference in thermal expansion coefficients between the concrete layer and the steel structure causes interface cracking, and the traditional mortar bonding layer is prone to hollowing due to insufficient base treatment (such as no interface agent, no layered plastering); low construction efficiency: concrete pouring requires on-site formwork and maintenance, and the process is complicated, which is contrary to the concept of rapid construction of steel structures; poor economic efficiency: high labor and material costs, and secondary decoration of facade tiles are required, which increases the difficulty of later maintenance. In addition, during the use of steel stairs, the tiles are prone to cracking, which affects the safety and aesthetics of the stairs. Summary of the invention

[0003] The purpose of the present invention is to provide a combined steel staircase structure that is resistant to hollowing and cracking, so as to solve the technical problems that traditional steel structure stairs are prone to hollowing and cracking, complex construction process and poor reliability of tile bonding.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] A combined steel staircase structure for preventing hollow drum cracking, comprising a platform plate and a staircase module; the platform plate is connected to the vertical member of the main structure; the staircase module is connected between the ground and the platform plate or between upper and lower adjacent platform plates; the staircase module comprises a staircase bottom plate, side plates, a steel mesh and facing bricks; the staircase bottom plate is step-shaped, comprising a tread plate section and a facade plate section, and the top edge of the facade plate section exceeds the top surface of the corresponding tread plate section; the side plates are respectively connected to both sides of the staircase bottom plate; the part of the facade plate section that exceeds the top surface of the corresponding tread plate section, the tread plate section and the side plates on both sides jointly form a groove; the steel mesh is installed in the groove, and the edge of the steel mesh is fixedly connected to the surrounding side walls of the groove; an adhesive layer is provided in the groove, and the top surface of the adhesive layer does not exceed the top edge of the facade plate section; the facing bricks are laid on the top surface of the adhesive layer; the surface of the facade plate section is coated with a coating; the uppermost tread plate section and the corresponding The platform board on the side is connected; an overlap groove is arranged on the top surface of the platform board, near the upper end of the stair module; an upper shock-absorbing layer and a limiter are arranged in the overlap groove, and the upper shock-absorbing layer is laid on the bottom surface of the overlap groove; the uppermost tread section is overlapped in the overlap groove, and a hole is reserved on the uppermost tread section at the position corresponding to the limiter; the limiter is inserted into the hole, and a distance is left between the limiter and the edge of the hole; a gap is formed between the uppermost tread section and the side wall of the overlap groove. A hydraulic damper is arranged between the vertical panel section on the lower side; the vertical panel section on the lower side is connected to the platform panel or the ground on the corresponding side; a limiting groove is arranged on the top surface of the platform panel or the ground, close to the lower end of the stair module; the lower end of the vertical panel section on the lower side is inserted into the limiting groove; an elastic sealing pad is arranged between the limiting groove and the vertical panel section; a lower shock-absorbing layer is arranged between the lower tread plate section and the ground or the platform panel; shape memory alloy springs are embedded in both the upper shock-absorbing layer and the lower shock-absorbing layer.

[0006] Preferably, the steel mesh is made of a rectangular steel pipe, and the steel mesh is connected to the side wall of the groove by welding.

[0007] Preferably, the depth of the groove is not less than 15 mm.

[0008] Preferably, a micro sensor is embedded in the top of the steel mesh to monitor the bonding state and stress condition of the tiles, and the micro sensor is connected to the monitoring platform.

[0009] Preferably, the thickness of the upper shock-absorbing layer and the lower shock-absorbing layer is 20-30 mm; hexagonal cavity units are arranged inside the upper shock-absorbing layer and the lower shock-absorbing layer, the side length of the hexagonal cavity units is 10-15 mm, and the wall thickness is 0.5-1.2 mm; the height of the hexagonal cavity units is consistent with the thickness of the shock-absorbing layer; the hexagonal cavity units are arranged in a gradient manner in the upper shock-absorbing layer and the lower shock-absorbing layer.

[0010] Preferably, the shape memory alloy spring is located along a diagonal line of the upper shock absorbing layer or the lower shock absorbing layer.

[0011] Preferably, the hole is in the shape of an elongated strip, and a sleeve is provided on the uppermost tread section at the location of the hole; the height of the sleeve is smaller than the depth of the groove; the limit member is inserted in the sleeve, and elastic material is filled between the limit member and the sleeve.

[0012] Preferably, microcapsule repairing agent and SMP fiber mesh are embedded in the bonding layer; the diameter of the microcapsule is 100-150 μm; and the microcapsule is filled with epoxy resin core material containing carbon nanotubes.

[0013] A construction method for a combined steel staircase structure that prevents hollow drum cracking includes the following steps.

[0014] Step 1: construct the platform plate. The platform plate and the column structure are constructed as one.

[0015] Step 2: Construct the stair base plate, side plates and steel mesh: Weld the stair base plate, side plates and steel mesh into a combined steel structure.

[0016] Step three, hoist the combined steel structure formed in step two to the designed position.

[0017] Step 4: Connect the lower end of the combined steel structure to the ground / platform plate.

[0018] Step 5: Connect the uppermost tread section to the platform board.

[0019] Step six: laying of bonding layer and facing bricks, and the construction is now completed.

[0020] Preferably, microcapsule repair agent and SMP fiber mesh are buried in the bonding layer, and the bonding layer is evenly applied in the groove to ensure that the surface of the bonding layer does not exceed the top edge of the facade panel segment and the upper surface of the facing brick is flush with the top edge of the facade panel segment; at the same time, a layer of paint is applied on the surface of the facade panel segment to form a protective coating.

[0021] Compared with the prior art, the present invention has the following characteristics and beneficial effects.

[0022] 1. Traditional stair tiles often have hollowing problems, mainly because the bonding between the tiles and the concrete or steel structure is not strong during construction. In contrast, the steel mesh of the present invention can effectively enhance the bonding between the tiles and the stair structure, thereby greatly reducing hollowing and cracking. In addition, the combined steel staircase structure of the present invention is more reliable and simpler, and can be prefabricated off-site in advance, greatly reducing time-consuming and labor-intensive problems. The embedded method further ensures that the tiles will not have hollowing problems. The combined unit standardized structural system of the steel mesh can be implemented together in the processing plant during the processing of the steel stairs, without having to be implemented in the later decoration stage.

[0023] 2. The present invention optimizes the steel stair tread method, abandons the method of wrapping the flat facade of the steel stair tread with a layer of reinforced concrete, cancels the method of tiling the facade, and instead uses a method of directly spraying the tread facade with a coating to show the texture of the steel structure. The flat tread brick method is optimized to lay the face bricks in an embedded manner, and a unitized structure composed of a rectangular steel pipe network is added to the bonding layer of the face bricks, which effectively plays the role of hollowing the face bricks; at the same time, by completing the prefabricated structure of the rectangular steel pipe network unit in the manufacturing stage of the steel staircase, the construction period can be greatly shortened and the tedious construction work on the construction site can be reduced. In addition, the prefabricated structure can ensure the stability of the construction quality and improve the overall construction efficiency. On the flat treads, the embedded paving method reduces the demand for facing bricks compared to the traditional brick laying method, making the construction process more concise and efficient. The present invention sets a coating on the facade, which not only enhances the aesthetics of the steel structure, but also avoids the cracking problem that may occur due to the use of cement mortar. At the same time, the coating has strong adhesion, reducing the need for maintenance and repair. 3. The present invention reduces the need for later repair and maintenance: Since the present invention completes all the process steps of the steel staircase in the processing stage, it reduces the need for later repair or restoration work, saving time and cost. At the same time, the present invention achieves bionic adaptation of stress distribution through the combined design of closely spaced small hexagons (front edge) and sparsely spaced large hexagons (rear), which improves the energy absorption efficiency by 30% compared with the traditional uniform shock-absorbing layer.

[0024] 4. The present invention adopts a dual-mode shock absorption mechanism. The shape memory alloy spring and the honeycomb structure form a synergistic energy dissipation system. The low-frequency vibration is absorbed by the honeycomb structure. At the same time, an SMP fiber mesh is set in the bonding layer. The high-frequency vibration is dissipated through the SMA phase change. The SMP fiber mesh absorbs energy through phase change under dynamic load, reducing the shear stress between the tiles and the steel mesh. When the bonding layer produces shrinkage cracks due to temperature difference, the SMP shrinks due to heat (or is heated by electricity), generating prestress to inhibit crack expansion. The SMP fiber mesh and microcapsules form a "shrink first and then fill" dual-stage repair: SMP closes large cracks → microcapsules release resin to fill micropores. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the combined steel staircase structure of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the staircase module in the present invention.

[0028] Figure 3 It is a structural schematic diagram of the stair bottom plate in the present invention.

[0029] Figure 4It is a schematic diagram of the connection structure between the stair module and the platform plate in the present invention.

[0030] Figure 5 It is a schematic diagram of the horizontal section structure of the upper shock-absorbing layer in the present invention.

[0031] Figure numerals: 1-platform plate, 2-vertical member, 3-stair bottom plate, 3.1-tread section, 3.2-vertical panel section, 4-side plate, 5-steel mesh, 6-facing brick, 7-groove, 8-adhesive layer, 9-coating, 10-lap groove, 11-upper shock-absorbing layer, 12-limiting member, 13-hydraulic damper, 14-limiting groove, 15-shape memory alloy spring, 16-sleeve, 17-elastic sealing pad, 18-micro sensor, 19-lower shock-absorbing layer. DETAILED DESCRIPTION

[0032] like Figure 1-5As shown, this anti-aircraft 1 drum cracking combined steel staircase structure includes a platform plate 1 and a stair module; the platform plate 1 is connected to the vertical member 2 of the main structure; the stair module is connected between the ground and the platform plate 1 or between the upper and lower adjacent platform plates 1; the stair module includes a stair bottom plate 3, a side plate 4, a steel mesh 5 and a facing brick 6; the stair bottom plate 3 is in a step shape, including a tread section 3.1 and a facade section 3.2; the facade section 3.2 is connected to the front edge of the tread section 3.1, and the top edge of the facade section 3.2 exceeds the top surface of the corresponding tread section 3.1; the upper end of the stair bottom plate 3 is the tread section 3.1, and the stair module ... The lower end of the bottom plate 3 is a vertical panel section 3.2; the side panels 4 are respectively connected to the two sides of the stair bottom plate 3; the portion of the vertical panel section 3.2 that exceeds the top surface of the corresponding step section 3.1, the step section 3.1 and the side panels 4 on both sides jointly form a groove 7; the steel mesh 5 is installed in the groove 7, and the edge of the steel mesh 5 is fixedly connected to the surrounding side wall of the groove 7; an adhesive layer 8 is arranged in the groove 7, and the top surface of the adhesive layer 8 does not exceed the top edge of the vertical panel section 3.2; the facing bricks 6 are laid on the top surface of the adhesive layer 8; the surface of the vertical panel section 3.2 is coated with a coating 9; the coating 9 uses SMP particles with a particle size of 50-100μm, and the SMP particles and graphene are modified The uppermost tread section 3.1 is connected to the platform board 1 on the corresponding side; a lap groove 10 is arranged on the top surface of the platform board 1, close to the upper end of the stair module; an upper shock-absorbing layer 11 and a stopper 12 are arranged in the lap groove 10, and the upper shock-absorbing layer 11 is laid on the bottom surface of the lap groove 10; the uppermost tread section 3.1 is laid in the lap groove 10, and a hole is reserved on the uppermost tread section 3.1 at the position corresponding to the stopper 12; the stopper 12 is inserted into the hole, and a distance is left between the stopper 12 and the edge of the hole; a hydraulic resistance is arranged between the uppermost tread section 3.1 and the side wall of the lap groove 10 A damper 13 is provided; the lowermost vertical panel section 3.2 is connected to the platform board 1 or the ground on the corresponding side; a limiting groove 14 is provided on the top surface of the platform board 1 or the ground, near the lower end of the stair module; the height of the part where the lower end of the lowermost vertical panel section 3.2 exceeds the tread section 3.1 is adapted to the depth of the limiting groove 14; the lower end of the lowermost vertical panel section 3.2 is inserted into the limiting groove 14; an elastic sealing pad 17 is provided between the limiting groove 14 and the vertical panel section 3.2; a lower shock-absorbing layer 19 is provided between the lowermost tread section 3.1 and the ground or the platform board 1; shape memory alloy springs 15 are embedded in both the upper shock-absorbing layer 11 and the lower shock-absorbing layer 19.

[0033] In this embodiment, the steel mesh 5 is made of a rectangular steel pipe, and the steel mesh 5 is connected to the side wall of the groove 7 by welding.

[0034] In this embodiment, the depth of the groove is not less than 15 mm.

[0035] In this embodiment, a micro sensor 18 is embedded in the composite structure of the steel mesh 5, and the micro sensor 18 is connected to the monitoring platform; the micro sensor can monitor the bonding state and stress condition of the tiles, and timely feed back the information to the monitoring platform; the micro sensor adopts a strain sensor or a piezoelectric sensor; the strain sensor is used to detect the stress and strain changes between the tiles and the steel mesh; when the bonding state of the tiles changes or is subjected to external forces, the strain sensor will sense these changes and provide stress data. Piezoelectric sensors can sense changes in force, and are particularly suitable for monitoring the stress condition of tiles. When the structure is subjected to external impact or vibration, the piezoelectric sensor will generate an electrical signal related to the magnitude and direction of the force, thereby detecting the stress condition of the tiles; the sensor (such as a strain sensor, a piezoelectric sensor) performs signal conversion and processing through a data acquisition module (DAQ), and then transmits the processed data to the monitoring platform through a wired or wireless method to achieve an early warning response.

[0036] In this embodiment, the thickness of the upper shock-absorbing layer 11 and the lower shock-absorbing layer 19 is 20-30 mm; hexagonal cavity units are arranged inside the upper shock-absorbing layer 11 and the lower shock-absorbing layer 19, and the side length of the hexagonal cavity unit is 10-15 mm, and the wall thickness is 0.5-1.2 mm; the height of the hexagonal cavity unit is consistent with the thickness of the shock-absorbing layer; the hexagonal cavity units are arranged in a gradient manner in the upper shock-absorbing layer 11 and the lower shock-absorbing layer 19, and the high-load area near the front edge of the step adopts densely packed small hexagons with a side length of 10 mm and a wall thickness of 1.2 mm, and the rear area adopts sparsely packed large hexagons with a side length of 15 mm and a wall thickness of 0.8 mm to adapt to the difference in stress distribution.

[0037] In this embodiment, the shape memory alloy spring 15 is located along the diagonal of the upper shock absorbing layer 11 or the lower shock absorbing layer 19. The shape memory alloy spring 15 is made of nickel-titanium alloy NiTi, and the phase change temperature is set to 25-35°C. When the vibration exceeds the limit, martensitic phase transformation occurs, and energy is consumed through deformation.

[0038] In this embodiment, the hole is in the shape of an elongated strip, and a sleeve 16 is provided on the uppermost tread section 3.1 at the location of the hole; the height of the sleeve 16 is less than the depth of the groove 7; the limit member 12 is inserted in the sleeve 16, and elastic material is filled between the limit member 12 and the sleeve 16.

[0039] In this embodiment, microcapsule repair agent and SMP fiber mesh (silane modified polymer fiber mesh) are embedded in the bonding layer 8; the diameter of the SMP fiber mesh is 0.2-0.5mm, the spacing is 2-3mm, and the shape recovery rate is greater than 95%; the diameter of the microcapsule is 100-150μm, the shell layer is a gelatin-arabic gum composite film, and the breakage rate is less than 3%; the epoxy resin core material filled in the microcapsule contains 0.5-1wt% carbon nanotubes.

[0040] In this embodiment, the hydraulic damper 13 adopts an existing micro hydraulic damper.

[0041] The construction method of the combined steel staircase structure for preventing air drum cracking comprises the following steps.

[0042] Step 1, construct the platform plate 1, the platform plate 1 and the column structure are constructed integrally; the platform plate 1 adopts a reinforced concrete structure, and a lap groove 10, a limit piece 12 and a limit groove 14 are set on the platform plate 1; the vertical member 2 is a steel column or a structural wall.

[0043] Step 2: construct the stair base plate 3, side plate 4 and steel mesh 5: weld the stair base plate 3, side plate 4 and steel mesh 5 into a combined steel structure; the stair base plate 3 is manufactured into a step-shaped structure (step height error ≤ 1mm) by a compression molding process; the steel mesh 5 is welded from rectangular steel pipes (20×30×2mm) into a grid (100×100mm), and the welds are subjected to UT flaw detection.

[0044] Step three, hoist the combined steel structure formed in step two to the designed position, overlap the uppermost tread section 3.1 of the combined steel structure in the overlap groove 10, and the limit piece 12 passes through the hole; the lowermost facade panel section 3.2 of the combined steel structure is inserted in the limit groove 14.

[0045] Step 4: Connect the lower end of the combined steel structure to the ground / platform plate 1; Step 5, connecting the uppermost tread plate section 3.1 and the platform plate 1; Step 6: Laying of bonding layer 8 and facing brick 6. Construction is now complete. The bonding layer 8 uses polymer mortar (compressive strength ≥ 40MPa) and is poured in layers. In the first layer of mortar: lay SMP fiber mesh and cover microcapsule repair agent (dosage 6wt%). In the second layer: add nano-silicon dioxide polymer modified mortar (elastic modulus 5GPa). Control thickness of each layer: 3.5±0.3mm (monitored by laser thickness gauge). Apply bonding layer 8 evenly in groove 7 to ensure that the surface of bonding layer 8 does not exceed the top edge of the facade panel segment. The top edge of the facing brick 6 is flush with the top edge of the facade panel segment. At the same time, apply a layer of anti-corrosion coating blended with SMP particles (particle size 50-100μm) and graphene-modified polyurethane coating on the surface of the facade panel segment 3.2. When microcracks (width <0.1mm) are generated on the coating surface due to temperature changes (such as sunlight exposure) or mechanical scratches, SMP shrinks due to heat (trigger temperature 35-45℃) and actively closes the cracks. The microcapsule healing agents in the coating complement each other - SMP closes the cracks, and the microcapsules release epoxy resin to fill the remaining voids.

[0046] The above embodiments are not exhaustive of specific implementation methods, and there may be other embodiments. The above embodiments are intended to illustrate the present invention rather than to limit the protection scope of the present invention. All applications derived from simple variations of the present invention fall within the protection scope of the present invention.

Claims

1. A combined steel staircase structure for preventing hollow drum cracking, comprising a platform plate (1) and a staircase module; the platform plate (1) is connected to a vertical member (2) of a main structure; the staircase module is connected between the ground and the platform plate (1) or between upper and lower adjacent platform plates (1); characterized in that: The stair module comprises a stair base plate (3), side plates (4), a steel mesh (5) and facing bricks (6); the stair base plate (3) is in the shape of a step, comprising a tread plate section (3.1) and a vertical plate section (3.2), and the top edge of the vertical plate section (3.2) exceeds the top surface of the corresponding tread plate section (3.1); the side plates (4) are respectively connected to both sides of the stair base plate (3); the portion of the vertical plate section (3.2) that exceeds the top surface of the corresponding tread plate section (3.1), the tread plate section (3.1) and the side plates (4) on both sides jointly form a groove (7); the steel mesh ( 5) is installed in the groove (7), and the edge of the steel mesh (5) is fixedly connected to the surrounding side wall of the groove (7); an adhesive layer (8) is provided in the groove (7), and the top surface of the adhesive layer (8) does not exceed the top edge of the facade panel section (3.2); the facing brick (6) is laid on the top surface of the adhesive layer (8); the surface of the facade panel section (3.2) is coated with a coating (9); the uppermost step board section (3.1) is connected to the platform board (1) on the corresponding side; a lap groove (10) is provided on the top surface of the platform board (1) near the upper end of the stair module; the lap groove (10) An upper shock absorbing layer (11) and a limiting member (12) are provided in the middle, and the upper shock absorbing layer (11) is laid on the bottom surface of the overlapping groove (10); the uppermost tread plate section (3.1) is laid in the overlapping groove (10), and a hole is reserved on the uppermost tread plate section (3.1) at a position corresponding to the limiting member (12); the limiting member (12) is inserted into the hole, and a distance is left between the limiting member (12) and the edge of the hole; a hydraulic damper (13) is provided between the uppermost tread plate section (3.1) and the side wall of the overlapping groove (10); the lowermost vertical panel section (3.2 ) is connected to the platform plate (1) or the ground on the corresponding side; a limiting groove (14) is provided on the top surface of the platform plate (1) or the ground, close to the lower end of the stair module; the lower end of the lowest vertical panel section (3.2) is inserted into the limiting groove (14); an elastic sealing pad (17) is provided between the limiting groove (14) and the vertical panel section (3.2); a lower shock-absorbing layer (19) is provided between the lowest tread section (3.1) and the ground or the platform plate (1); and shape memory alloy springs (15) are embedded in both the upper shock-absorbing layer (11) and the lower shock-absorbing layer (19).

2. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The steel mesh (5) is made of a rectangular steel tube, and the steel mesh (5) is connected to the side wall of the groove (7) by welding.

3. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The depth of the groove (7) is not less than 15 mm.

4. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: A micro sensor (18) is embedded in the top of the steel mesh (5) to monitor the bonding state and stress condition of the tiles (6); the micro sensor (18) is connected to a monitoring platform.

5. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The thickness of the upper shock absorbing layer (11) and the lower shock absorbing layer (19) is 20-30 mm; hexagonal cavity units are arranged inside the upper shock absorbing layer (11) and the lower shock absorbing layer (19); the side length of the hexagonal cavity units is 10-15 mm and the wall thickness is 0.5-1.2 mm; the height of the hexagonal cavity units is consistent with the thickness of the shock absorbing layer; and the hexagonal cavity units are arranged in a gradient manner inside the upper shock absorbing layer (11) and the lower shock absorbing layer (19).

6. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The shape memory alloy spring (15) is located along a diagonal line of the upper shock absorbing layer (11) or the lower shock absorbing layer (19).

7. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The hole is in the shape of an elongated strip, and a sleeve (16) is provided on the uppermost tread section (3.1) at the location of the hole; the height of the sleeve (16) is less than the depth of the groove (7); the limiting member (12) is inserted into the sleeve (16), and an elastic material is filled between the limiting member (12) and the sleeve (16).

8. The combined steel staircase structure for preventing hollow drum cracking according to claim 1 is characterized in that: The bonding layer (8) is embedded with a microcapsule repair agent and an SMP fiber mesh; the diameter of the microcapsule is 100-150 μm; and the microcapsule is filled with an epoxy resin core material containing carbon nanotubes.

9. A construction method for a combined steel staircase structure to prevent hollow drum cracking according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: constructing a platform plate (1), wherein the platform plate (1) and the column structure are constructed in one piece; Step 2: constructing the stair bottom plate (3), the side plate (4) and the steel mesh (5): welding the stair bottom plate (3), the side plate (4) and the steel mesh (5) into a combined steel structure; Step 3, hoisting the combined steel structure formed in step 2 to the designed position; Step 4: Connect the lower end of the combined steel structure to the ground / platform plate (1); Step 5, connecting the uppermost tread plate section (3.1) and the platform plate (1); Step six: laying of the adhesive layer (8) and the tiles (6), and the construction is now complete.

10. The construction method of the combined steel staircase structure for preventing air drum cracking according to claim 9, characterized in that: A microcapsule repair agent and an SMP fiber mesh are embedded in the bonding layer, and the bonding layer (8) is evenly applied in the groove (7), ensuring that the surface of the bonding layer (8) does not exceed the top edge of the facade panel segment, and the upper surface of the facing brick (6) is flush with the top edge of the facade panel segment (3.2); at the same time, a layer of paint is applied on the surface of the facade panel segment (3.2) to form a protective coating.

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