Corrugated steel web lower flange steel-concrete joint structure and construction method

Abstract

The invention belongs to the technical field of corrugated steel web composite beam bridges, and discloses a corrugated steel web lower flange steel-concrete joint structure and a construction method, and the corrugated steel web lower flange steel-concrete joint structure comprises a lower flange plate; the prefabricated concrete bottom plate is in lap joint with the top of the end, away from the corrugated steel web, of the lower flange plate, and a pouring space located above the lower flange plate is formed between the prefabricated concrete bottom plate and the corrugated steel web; a plurality of first stress pieces; a plurality of second stress pieces; and the cast-in-place concrete bottom plate is formed after concrete is poured into the pouring space, the formed cast-in-place concrete bottom plate wraps the multiple first stress parts and the multiple second stress parts, and the cast-in-place concrete bottom plate, the corrugated steel web, the lower flange plate and the prefabricated concrete bottom plate form a jointly-stressed whole. According to the outer wrapping type structure, through wrapping connection of the steel webs and the concrete, the sealing performance and tightness of an interface are ensured, and therefore the overall durability of a joint part is improved; and the shear stiffness is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of corrugated steel web composite beam bridges, and particularly relates to a corrugated steel web lower flange steel-concrete joint structure and a construction method. Background Art

[0002] The composite beam bridge with corrugated steel web is a lightweight, high-performance bridge structure, which is designed to combine the high strength of steel and the durability of concrete. However, in actual engineering, the junction between the corrugated steel web and the concrete top and bottom plates is a technical difficulty. The multiple plate sections on the corrugated steel web are usually inclined plate sections and straight plate sections. This junction not only needs to withstand large longitudinal shear forces, but also needs to resist the transverse bending moments caused by vehicle loads, concrete deadweight, etc.

[0003] In traditional designs, joint structures usually adopt flange type or embedded type. Among them, flange type joint is achieved by combining steel flange plate with concrete, usually by reverse casting. During construction, concrete is bonded to the connector by gravity, but due to construction conditions and casting process limitations, it is difficult for the joint to achieve ideal density. Embedded joint is achieved by connecting the corrugated steel web and the concrete slab with longitudinal fillet welds to form an embedded structure. Although the problem of reverse casting is avoided, due to the low longitudinal stiffness of the corrugated steel web itself, its joint surface with concrete is prone to separation under load, accompanied by interface cracks. Especially under vehicle loads, the joint requires additional waterproofing treatment to deal with potential cracks and water seepage risks, which increases construction complexity and maintenance costs.

[0004] Therefore, we propose a corrugated steel web lower flange steel-concrete joint structure and construction method to solve the above problems. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a corrugated steel web lower flange steel-concrete joint structure and construction method, which solves the problems of insufficient density and poor shear and bending resistance.

[0006] The present invention is implemented by the following scheme: a corrugated steel web lower flange steel-concrete joint structure, comprising: The lower flange plate is fixed to the bottom of the corrugated steel web; A precast concrete bottom plate overlaps the top of one end of the lower flange plate away from the corrugated steel web plate, and a casting space located above the lower flange plate is formed between the bottom plate and the corrugated steel web plate; A plurality of first force-bearing members are arranged at the lower part of the corrugated steel web facing the precast concrete bottom plate and are located in the casting space; A plurality of second force-bearing members are arranged on the top of the lower flange plate and are located in the casting space; and The cast-in-place concrete base plate is formed after pouring concrete in the pouring space, and the cast-in-place concrete base plate wraps a plurality of first load-bearing members and a plurality of second load-bearing members, and forms a common load-bearing whole with the corrugated steel web, the lower flange plate and the precast concrete base plate.

[0007] A further improvement in the structure of the steel-concrete joint of the lower flange of the corrugated steel web of the present invention is that the number of the first force-bearing members is consistent with the number of plate segments of the corrugated steel web, and multiple first force-bearing members correspond to multiple plate segments respectively, and the first force-bearing members include at least one first force-bearing plate fixed on the corresponding plate segment, at least one first through-hole penetrating along the thickness direction of all the first force-bearing plates, and at least one first force-bearing rod respectively penetrated through at least one first through-hole and extending from both ends of the corresponding first through-hole.

[0008] A further improvement in the structure of the steel-concrete joint of the lower flange of the corrugated steel web of the present invention is that a third force-bearing member is connected to at least part of the plate section of the corrugated steel web for limiting the corresponding first force-bearing rod to prevent the first force-bearing rod from moving away from the corresponding plate section.

[0009] A further improvement in the structure of the steel-concrete joint of the lower flange of the corrugated steel web of the present invention is that the number of the third force-bearing members is consistent with the number of the first force-bearing rods on the corresponding plate section, and the third force-bearing member includes a limit member and a limit hole for the corresponding first force-bearing rod to pass through.

[0010] A further improvement of the steel-concrete joint structure of the lower flange of the corrugated steel web of the present invention is that the first load-bearing plate is arranged vertically, and all the first load-bearing rods on two adjacent plate sections correspond to each other one by one and are connected end to end.

[0011] A further improvement of the steel-concrete joint structure of the lower flange of the corrugated steel web of the present invention is that the first load-bearing plate is arranged vertically, and the opposite ends of two adjacent first load-bearing rods are connected and fixed.

[0012] A further improvement of the steel-concrete joint structure of the lower flange of the corrugated steel web of the present invention is that a stiffener for fixing the corresponding first load-bearing plate is fixed on at least part of the plate section of the corrugated steel web, and the stiffener is arranged transversely as a whole.

[0013] A further improvement in the structure of the steel-concrete joint of the lower flange of the corrugated steel web of the present invention is that the second force-bearing member includes at least one second force-bearing plate fixed to the top of the lower flange plate, at least one second through-hole penetrating along the thickness direction of each second force-bearing plate, and at least one second force-bearing rod corresponding to the at least one second through-hole, the first end of the second force-bearing rod is embedded in the precast concrete bottom plate, and the second end of the second force-bearing rod extends outward from the precast concrete bottom plate and passes through the corresponding second through-hole until it is connected and fixed to the at least one first force-bearing rod.

[0014] A further improvement of the corrugated steel web lower flange steel-concrete joint structure of the present invention is that the second force-bearing member also includes a plurality of limit rods fixed to the top of the lower flange plate, and the plurality of limit rods are distributed on opposite sides of the second force-bearing rod.

[0015] A construction method for a corrugated steel web lower flange steel-concrete joint structure comprises the following steps: Providing a lower flange plate and fixing the lower flange plate to the bottom of the corrugated steel web; Providing a precast concrete bottom plate, and overlapping the precast concrete bottom plate on the top of one end of the lower flange plate away from the corrugated steel web plate, and forming a casting space above the lower flange plate between the precast concrete bottom plate and the corrugated steel web plate; Providing a plurality of first force-bearing members, and arranging the plurality of first force-bearing members at the lower part of the side of the corrugated steel web facing the precast concrete bottom plate, and being located in the casting space; Providing a plurality of second force-bearing members, and arranging the plurality of second force-bearing members on the top of the lower flange plate and in the casting space; Concrete is poured in the pouring space, and the concrete wraps the plurality of first force-bearing members and the plurality of second force-bearing members to form a cast-in-place concrete bottom plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts an outsourcing joint structure design and combines it with a forward top-down concrete pouring process to avoid the compactness problem caused by traditional reverse pouring. The outsourcing structure ensures the sealing and tightness of the interface by wrapping and connecting the steel web and concrete, thereby improving the overall durability of the joint. A first load-bearing plate is arranged on the straight plate section of the corrugated steel web, and a stiffener is arranged thereon to improve the shear stiffness. A limit rod is arranged on the lower flange plate to form a composite bending resistance mechanism together with the first load-bearing rod. A limit member is arranged on the inclined plate section to combine with the first load-bearing rod to effectively resist the pull-out force between the steel web and concrete, thereby improving the overall mechanical properties of the joint. The outsourcing design reduces the path of moisture penetration, and at the same time, through the arrangement of multiple first load-bearing plates and limit members, the interface force distribution is optimized to reduce the risk of cracks in the joint. At the same time, the assembled connection method of the precast concrete base plate and the steel member is used to achieve efficient construction and reduce construction costs and construction period. It also takes into account the resistance to longitudinal shear force, transverse bending moment and pull-out force, so that the joint exhibits excellent mechanical properties under multiple working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the pouring space position of the present invention is shown.

[0018] Figure 2 A schematic diagram of the first force-bearing member and the second force-bearing member mechanism of the present invention is shown.

[0019] Figure 3 A schematic diagram showing the anti-torsion mechanism composed of the first force-bearing rod and the limiting rod of the present invention jointly resisting force.

[0020] In the figure: 1, corrugated steel web; 101, first straight plate section; 102, second straight plate section; 103, inclined plate section; 2, lower flange plate; 3, precast concrete bottom plate; 4, casting space; 5, casting port; 6, first load-bearing plate; 7, first load-bearing rod; 8, limiter; 9, stiffener; 10, limiter rod; 11, second load-bearing plate; 12, third load-bearing rod; 13, third through-hole; 14, second through-hole; 15, first through-hole. DETAILED DESCRIPTION

[0021] In order to solve the problems of insufficient compactness and poor shear and bending resistance, the present invention provides a corrugated steel web lower flange steel-concrete joint structure and construction method. The following is a further description of the corrugated steel web lower flange steel-concrete joint structure and construction method with specific embodiments and accompanying drawings.

[0022] See also Figure 1~Figure 3 As shown, a corrugated steel web lower flange steel-concrete joint structure comprises: The lower flange plate 2 is fixed to the bottom of the corrugated steel web 1; A precast concrete bottom plate 3 is overlapped on the top of one end of the lower flange plate 2 away from the corrugated steel web plate 1, and a casting space 4 located above the lower flange plate 2 is formed between the bottom plate 3 and the corrugated steel web plate 1; A plurality of first force-bearing members are arranged at the lower part of the corrugated steel web 1 facing the precast concrete bottom plate 3 and are located in the casting space 4; A plurality of second force-bearing members are arranged on the top of the lower flange plate 2 and located in the casting space 4; and The cast-in-place concrete base plate is formed after pouring concrete in the pouring space 4, and the formed cast-in-place concrete base plate wraps multiple first load-bearing members and multiple second load-bearing members, and forms a common force-bearing whole with the corrugated steel web 1, the lower flange plate 2 and the precast concrete base plate 3.

[0023] For details, see Figure 1 As shown, a plurality of pouring ports 5 are reserved at one end of the precast concrete bottom plate 3 facing the corrugated steel web 1, and the plurality of pouring ports 5 correspond to the plurality of second force-bearing members respectively; a post-casting strip is reserved at one side of the corrugated steel web 1 facing the precast concrete bottom plate 3; high-strength cement mortar and concrete are poured into the pouring ports 5 and the post-casting strip to ensure that the corrugated steel web 1, the lower flange plate 2 and the precast concrete bottom plate 3 can be tightly combined and bear force together; when the precast concrete bottom plate 3 is overlapped on the top of the lower flange plate 2, epoxy mortar can be applied in advance to the contact area between the top of the lower flange plate 2 and the bottom of the precast concrete bottom plate 3, so that the connection can be waterproof and leakproof; The concrete in the post-cast strip of the joint is poured from top to bottom, which ensures the compactness of the pouring and does not need to consider durability issues such as water seepage. The corrugated steel web 1 and the lower flange plate 2 are set to have the best shear resistance. The precast concrete base plate 3 can be placed directly on the lower flange plate 2 without the need to set up a cantilever hanging basket. Based on the above structural design, the joint of the corrugated steel web 1 and the precast concrete base plate 3 can be poured with concrete from top to bottom, which effectively avoids the gap problem caused by reverse pouring, ensures the high compactness of the concrete pouring, and further improves the durability and anti-seepage performance of the joint.

[0024] Among them, see Figure 2 As shown, the number of first force-bearing members is consistent with the number of plate segments of the corrugated steel web 1, and the multiple first force-bearing members correspond to the multiple plate segments respectively. The first force-bearing members include at least one first force-bearing plate 6 fixed on the corresponding plate segment, at least one first through-hole 15 penetrating along the thickness direction of all the first force-bearing plates 6, and at least one first force-bearing rod 7 respectively penetrating at least one first through-hole 15 and extending from both ends of the corresponding first through-hole 15.

[0025] For details, see Figure 2 As shown, the corrugated steel web 1 is formed by a plurality of inclined plate segments 103 and a plurality of straight plate segments alternately arranged and connected end to end; in this embodiment, a first force-bearing plate 6 is fixed on each straight plate segment and the inclined plate segment 103, and two first through holes 15 arranged up and down are opened on the same first force-bearing plate 6, and a first force-bearing rod 7 is inserted in each first through hole 15; Furthermore, the straight plate section includes a first straight plate section 101 and a second straight plate section 102. The first straight plate section 101 is farther away from the precast concrete base plate 3 than the second straight plate section 102. The first force-bearing plate 6 on the first straight plate section 101 extends from one end of the first straight plate section 101 toward the precast concrete base plate 3 to form an extension section. The extension section is penetrated by two third through holes 13 arranged vertically, and two third force-bearing rods 12 are respectively penetrated in the two third through holes 13; the shapes of the first through hole 15 and the third through hole 13 can be adjusted to a trapezoidal, rectangular, or L-shaped shape according to actual force.

[0026] The extended section is provided to compensate for the difference in distance between the first straight section 101 and the second straight section 102 and the precast concrete bottom plate 3, so as to ensure that the internal force of the later cast-in-place concrete bottom plate is more balanced.

[0027] Among them, see Figure 2 As shown, at least part of the plate section of the corrugated steel web 1 is connected with a third force-bearing member for limiting the corresponding first force-bearing rod 7 to prevent the first force-bearing rod 7 from moving away from the corresponding plate section.

[0028] The number of the third force-bearing members is consistent with the number of the first force-bearing rods 7 on the corresponding plate segments, and the third force-bearing members include a limiting member 8 and a limiting hole for the corresponding first force-bearing rod 7 to pass through.

[0029] Specifically, in this embodiment, each inclined plate segment 103 is connected to a third force-bearing member, and the number of the limiting members 8 and the limiting holes in each third force-bearing member is two, and the two limiting members 8 are respectively located on both sides of the first force-bearing plate 6; By adopting the above-mentioned design, the pulling force between the cast-in-place concrete base plate and the corrugated steel web 1 can be effectively resisted, and the bonding surface can be prevented from being separated due to excessive pulling force; the inclined plate section 103 of the corrugated steel web 1 has a large pulling effect, and the oblique cracks in the concrete are often produced at the corners between the plate sections. Therefore, a third force-bearing member is provided on the oblique plate section 103 of the corrugated steel web 1 to resist the pulling force between the oblique plate section 103 and the concrete. The specific number and structural form of the third force-bearing member can be determined according to the structural force.

[0030] Among them, see Figure 2 As shown, the first force-bearing plate 6 is arranged vertically, and all the first force-bearing rods 7 on two adjacent plate sections correspond to each other one by one and are connected end to end; The first load-bearing plate 6 is perpendicular to the corresponding plate segment, and the bottom is connected and fixed to the top of the lower flange plate 2 .

[0031] By adopting the above design, the bending and shearing resistance of the entire corrugated steel web 1 can be greatly improved, thereby improving the load-bearing and force-bearing capacity.

[0032] Among them, see Figure 2 As shown, a stiffener 9 for fixing the corresponding first load-bearing plate 6 is fixed on at least part of the plate section of the corrugated steel web 1, and the stiffener 9 is arranged transversely as a whole.

[0033] Specifically, in this embodiment, the stiffener 9 is fixed to the straight plate segment; By adopting the above design, the stiffener 9 can improve the shear stiffness and effective bearing area of ​​the first load-bearing plate 6, thereby improving its shear resistance; Specifically, the shear bearing capacity calculation formula of the first load-bearing plate 6 provided with the stiffener 9 can be calculated according to the key shear bearing capacity formula of the angle steel connector: , --Design value of concrete compressive strength; b, h--width and stiffness of the first load-bearing plate; k--concrete bearing area reduction coefficient, which can be determined through standard push-out test.

[0034] Among them, see Figure 1-2As shown, the second force-bearing member includes at least one second force-bearing plate 11 fixed to the top of the lower flange plate 2, at least one second through-hole 14 penetrating along the thickness direction of each second force-bearing plate 11, and at least one second force-bearing rod corresponding to the at least one second through-hole 14. The first end of the second force-bearing rod is embedded in the precast concrete base plate 3, and the second end of the second force-bearing rod extends outward from the precast concrete base plate 3 and passes through the corresponding second through-hole 14 until it is connected and fixed to the at least one first force-bearing rod 7.

[0035] Specifically, the thickness of the first load-bearing plate 6 and the second load-bearing plate 11 should be no less than 16 mm, the diameter of the first perforation 15 should be larger than the sum of the diameter of the first load-bearing rod 7 and the maximum particle size of the aggregate, which can be 60-80 mm, and the diameter of the second load-bearing rod should not be less than 12 mm; The first force-bearing rod 7 can be connected to the second force-bearing rod embedded in the precast concrete base plate 3 to form an overall steel reinforcement skeleton, thereby improving the overall force-bearing effect; the second force-bearing plate 11 is designed to resist the longitudinal shear force between the lower flange plate 2 and the concrete base plate, and the second force-bearing rod of the second force-bearing plate 11 can be provided by the transverse steel bars of the precast concrete base plate 3 without the need for additional settings.

[0036] Among them, see Figure 2 As shown, the second force-bearing member further includes a plurality of limiting rods 10 fixed to the top of the lower flange plate 2, and the plurality of limiting rods 10 are distributed on opposite sides of the second force-bearing rod.

[0037] Specifically, the limit rod 10 can be a steel stud; through the design of multiple limit rods 10, in order to resist the pull-out force between the lower flange plate 2 and the concrete bottom plate, the limit rod 10 on the lower flange plate 2 and the first force rod 7 on the straight plate section of the corrugated steel web 1 work together to form a moment-resistant mechanism. This design resists the lateral moment through the combined action of the first force rod 7 and the limit rod 10, and disperses the stress concentration.

[0038] The lateral bending moment of the joint is resisted by the first force-bearing rod 7 on the first force-bearing plate 6 welded by the straight plate section of the corrugated steel web 1 and the torsion-resistant mechanism composed of the limit rod 10 arranged on the lower flange plate 2. Figure 3 As shown, it is assumed that the torsion center is the centroid of the clustering limit rod 10 provided on the lower flange plate 2; The shear force calculation formula of the first force-bearing rod 7 is: , --The shear force value shared by the i-th first load-bearing rod 7 on the first load-bearing plate 6 under the action of the design bending moment M at the joint; --The distance between the center of the i-th first force-bearing rod 7 on the first force-bearing plate 6 and the torsion center O; --The distance between the i-th limit rod 10 on the tension side of the lower flange plate 2 and the torsion center O; the design must meet ,in is the structural importance coefficient, is the design value of the shear bearing capacity of the first force-bearing rod 7, which can be calculated according to CJJ / T 272-2017 Technical Standard for Composite Beam Bridges with Corrugated Steel Webs; The calculation formula of the pull-out force of the limit rod 10 is: , --The pull-out force shared by the outermost limit rod 10 of the joint under the action of the design bending moment M; --The distance between the i-th limit rod 10 on the tension side of the lower flange plate 2 and the torsion center O; --The maximum value of the distance between the tension side limit rod 10 and the torsion center O; the design must meet ,in is the structural importance coefficient, is the design value of the pull-out bearing capacity of the limit rod 10, which can be calculated according to CJJ / T 272-2017 “Technical Standard for Composite Beam Bridges with Corrugated Steel Webs”.

[0039] A construction method for a corrugated steel web lower flange steel-concrete joint structure comprises the following steps: Providing a lower flange plate 2, and fixing the lower flange plate 2 to the bottom of the corrugated steel web 1; A precast concrete bottom plate 3 is provided, and the precast concrete bottom plate 3 is overlapped on the top of one end of the lower flange plate 2 away from the corrugated steel web 1, and a casting space 4 located above the lower flange plate 2 is formed between the precast concrete bottom plate 3 and the corrugated steel web 1; Providing a plurality of first force-bearing members, and arranging the plurality of first force-bearing members at the lower part of the corrugated steel web 1 facing the precast concrete bottom plate 3, and located in the casting space 4; Providing a plurality of second force-bearing members, and arranging the plurality of second force-bearing members on the top of the lower flange plate 2 and in the casting space 4; Concrete is poured in the pouring space 4, and the concrete wraps the plurality of first force-bearing members and the plurality of second force-bearing members to form a cast-in-place concrete bottom plate.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] The present invention is described in detail above in conjunction with the embodiments of the drawings, and those skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute limitations of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A corrugated steel web lower flange steel-concrete joint structure, characterized in that: include: The lower flange plate is fixed to the bottom of the corrugated steel web; A precast concrete bottom plate overlaps the top of one end of the lower flange plate away from the corrugated steel web plate, and a casting space located above the lower flange plate is formed between the bottom plate and the corrugated steel web plate; A plurality of first force-bearing members are arranged at the lower part of the corrugated steel web facing the precast concrete bottom plate and are located in the casting space; A plurality of second force-bearing members are arranged on the top of the lower flange plate and are located in the casting space; as well as A cast-in-place concrete bottom plate is formed after pouring concrete in the pouring space, and the cast-in-place concrete bottom plate wraps a plurality of first force-bearing members and a plurality of second force-bearing members, and forms a common force-bearing whole with the corrugated steel web plate, the lower flange plate and the precast concrete bottom plate; The number of the first force-bearing members is consistent with the number of plate segments of the corrugated steel web, and the plurality of first force-bearing members correspond to the plurality of plate segments respectively, and the first force-bearing members include at least one first force-bearing plate fixed on the corresponding plate segment, at least one first through-hole penetrating along the thickness direction of all the first force-bearing plates, and at least one first force-bearing rod penetrating at least one first through-hole and extending from both ends of the corresponding first through-hole respectively; The second force-bearing member includes at least one second force-bearing plate fixed to the top of the lower flange plate, at least one second through-hole penetrating along the thickness direction of each second force-bearing plate, and at least one second force-bearing rod corresponding to the at least one second through-hole, the first end of the second force-bearing rod is embedded in the precast concrete bottom plate, and the second end of the second force-bearing rod extends outward from the precast concrete bottom plate and passes through the corresponding second through-hole until it is connected and fixed to the at least one first force-bearing rod.

2. The corrugated steel web lower flange steel-concrete joint structure according to claim 1, characterized in that: At least part of the plate segments of the corrugated steel web is connected with a third force-bearing member for limiting the corresponding first force-bearing rod to prevent the first force-bearing rod from moving away from the corresponding plate segment.

3. The corrugated steel web lower flange steel-concrete joint structure according to claim 2, characterized in that: The number of the third force-bearing members is consistent with the number of the first force-bearing rods on the corresponding plate segment, and the third force-bearing members include a limiting member and a limiting hole for the corresponding first force-bearing rod to pass through.

4. The corrugated steel web lower flange steel-concrete joint structure according to claim 3, characterized in that: The first force-bearing plates are arranged vertically, and all the first force-bearing rods on two adjacent plate sections correspond to each other one by one and are connected end to end.

5. The corrugated steel web lower flange steel-concrete joint structure according to claim 4, characterized in that: The first load-bearing plate is perpendicular to the corresponding plate segment, and the bottom is connected and fixed to the top of the lower flange plate.

6. The corrugated steel web lower flange steel-concrete joint structure according to claim 1, characterized in that: A stiffening member for fixing the corresponding first load-bearing plate is fixed on at least part of the plate sections of the corrugated steel web, and the stiffening member is arranged transversely as a whole.

7. The corrugated steel web lower flange steel-concrete joint structure according to claim 1, characterized in that: The second force bearing member further includes a plurality of limit rods fixed to the top of the lower flange plate, and the plurality of limit rods are distributed on opposite sides of the second force bearing rod.

8. A construction method for the steel-concrete joint structure of the lower flange of the corrugated steel web, characterized in that: The steps include: Providing a lower flange plate and fixing the lower flange plate to the bottom of the corrugated steel web; Providing a precast concrete bottom plate, and overlapping the precast concrete bottom plate on the top of one end of the lower flange plate away from the corrugated steel web plate, and forming a casting space above the lower flange plate between the precast concrete bottom plate and the corrugated steel web plate; Providing a plurality of first force-bearing members, and arranging the plurality of first force-bearing members at the lower part of the side of the corrugated steel web facing the precast concrete bottom plate, and being located in the casting space; Providing a plurality of second force-bearing members, and arranging the plurality of second force-bearing members on the top of the lower flange plate and in the casting space; Concrete is poured in the pouring space, and the concrete wraps the plurality of first force-bearing members and the plurality of second force-bearing members to form a cast-in-place concrete bottom plate.

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