Composite structure of pre-embedded profile steel secondary beam dentate prefabricated steel plate panel and construction method

Abstract

The composite structure comprises a main beam, a first connecting piece is embedded in the main beam, and the first connecting piece is embedded in main beam concrete and forms a rigid anchoring end; the two ends of the profile steel secondary beam are embedded into the corresponding main beams respectively, and the profile steel secondary beam is fixedly connected with the main beams through first connecting pieces; and the floor plate is fixed at the top of the upper flange of the profile steel secondary beam. The invention discloses a construction method of a composite structure of a pre-embedded profile steel secondary beam dentate prefabricated steel plate panel. The construction method comprises the following steps: binding reinforcing steel bars of a supporting column and a main beam and sealing a mold; the profile steel secondary beams are hoisted in place and fixed to the main beam steel bars; floor plates are laid on the top surfaces of the upper flanges of the profile steel secondary beams; binding a floor plate reinforcing steel bar on the floor plate; and concrete is poured above the pouring space and the floor plate. The composite structure provided by the invention has the characteristic of high error-tolerant rate, the construction method is quick and convenient, the resource investment is low, and the cross operation time among various types of work is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of industrialized plant construction, relates to a composite structure of pre-buried steel secondary beams and horse-toothed prefabricated steel plate panels, and also relates to a construction method of the composite structure of pre-buried steel secondary beams and horse-toothed prefabricated steel plate panels. Background Art

[0002] With the steady promotion and construction of tower-type solar thermal projects, driven by national policies, the construction technology of industrial plants urgently needs innovation. Currently, conventional industrial plant construction in tower-type solar thermal projects faces numerous technical challenges, particularly in high-altitude locations. Construction workers are significantly affected by climate and altitude, resulting in low work efficiency and high construction risks. These issues severely hinder the overall efficiency and quality of the projects. Regarding the building structure, reinforced concrete beams, columns, and floor slabs are commonly used. This traditional construction method is characterized by long construction periods, complex and tedious procedures, and the involvement of multiple trades, which makes coordination difficult. This method is prone to quality issues and poses safety hazards, making it difficult to meet the demands of rapid construction and early commissioning of tower-type solar thermal projects. Furthermore, traditional formwork systems are costly, requiring a large amount of recyclable materials such as scaffolding and formwork, resulting in significant resource investment and high construction costs. Furthermore, the construction process is significantly affected by environmental factors. In adverse weather or complex terrain, progress can be hampered, and quality assurance is difficult.

[0003] Patent publication number CN102418385A discloses a novel reinforced concrete prefabricated, cast-in-place housing structure system and construction method. While this construction method partially improves assembly efficiency through the use of "steel tube concrete composite columns + prestressed composite beams," it still exhibits the following drawbacks in extreme environments such as high altitudes, large temperature swings, and strong winds. The application relies on a semi-prefabricated model of "full-length steel tubes + cast-in-place joints," requiring layered casting of column and beam joints. This approach fails to meet the tight deadlines for solar thermal projects, leaving the construction bottleneck unresolved. Embedded components such as molten salt pipeline anchors and collector bracket foundations require secondary on-site positioning, with accuracy affected by concrete shrinkage and wind loads, resulting in a low first-pass qualification rate. High-altitude adaptability is poor, and steel tube concrete columns are prone to frost heave and cracking in cold environments. Traditional formwork holes require the use of ground-based scaffolding, making manual erection inefficient under hypoxic conditions at high altitudes, and the risk of scaffolding overturning significantly increases in windy weather. The existing construction method also has the problem of a large amount of embedded parts. The embedding accuracy is high, and any slight deviation will affect the subsequent equipment installation and the operational stability of the entire solar thermal system. However, the existing process lacks effective technical means and guarantee measures for the precise positioning and fixation of embedded parts.

[0004] Numerous issues with existing construction methods pose numerous challenges to the construction of industrialized plant buildings for tower-type CSP projects. Therefore, there is an urgent need to develop new construction technologies to overcome traditional technical bottlenecks and achieve safe, efficient, and low-cost construction throughout the entire process. At the same time, these technologies should respond to policy and market demands and provide technical support and methodological reference for the construction of industrialized plant main structures, such as those for large-scale CSP power plants. This will improve construction efficiency, reduce construction costs, enhance construction quality and safety, and ultimately promote the sustainable development of tower-type CSP projects. Summary of the Invention

[0005] The first object of the present invention is to provide a composite structure of pre-buried steel secondary beams and horse-tooth prefabricated steel plate panels, which solves the problems of long construction period and low construction fault tolerance in the prior art.

[0006] The second object of the present invention is to provide a method for constructing a composite structure of pre-buried steel secondary beams and horse-tooth prefabricated steel plate panels.

[0007] The first technical solution adopted by the present invention is a composite structure of pre-embedded steel secondary beams and horse-tooth prefabricated steel plate panels, comprising: A main beam, wherein a first connecting member is embedded in the main beam concrete and forms a rigid anchoring end; The steel secondary beam has two ends respectively embedded in the corresponding main beam and is fixedly connected to the main beam through a first connecting piece; The floor panel is fixed to the top of the upper flange of the steel secondary beam. The floor panel forms an integral force-bearing system with the main beam and the steel secondary beam by pouring concrete.

[0008] The characteristics of the present invention are: The main beam is a cast-in-place reinforced concrete beam. The first connecting piece is tied to the main beam steel bar at a position corresponding to the steel secondary beam, and the steel secondary beam is welded and fixed to the first connecting piece.

[0009] The secondary steel beam is an H-shaped steel, and the top surface of the upper flange of the secondary steel beam is flush with the top surface of the main beam or the thickness of the overlapping layer is reserved.

[0010] The floor panels are arranged longitudinally along the main beam, and a second connecting piece is tied and welded to the main beam at the position corresponding to the floor panel. The second connecting piece is fixedly connected to the main beam. The floor panels are prefabricated galvanized steel plates in a horse tooth shape. The floor panels include several tooth grooves, and the cross-sections of the several tooth grooves are isosceles trapezoidal or rectangular.

[0011] The thickness of the floor panel is 3mm-8mm, the tooth depth of the tooth groove is 0.5-1.0 times the cross-sectional height of the steel secondary beam, and the crests are provided at the crests and troughs of the floor panel, with a width of 15-20cm.

[0012] A number of vertical studs are provided in the contact area between the floor panel and the upper flange of the steel secondary beam. The rods of the studs are embedded in the upper flange of the steel secondary beam, and the caps of the studs are buried in the cast-in-place concrete layer of the floor panel.

[0013] A concrete floor slab is further poured on top of the floor panel to form a composite slab. After the concrete floor slab is superimposed on the floor panel, bolts and steel secondary beams are used to form an integral load-bearing composite slab.

[0014] The second technical solution adopted by the present invention is a composite structure construction method of a pre-buried steel secondary beam and a horse-tooth prefabricated steel plate panel, comprising the following steps: Step 1: Tie the steel bars of the support columns and main beams and seal the mold to form a pouring space; Step 2: hoist the secondary steel beam into place and fix it to the main beam reinforcement; Step 3: Lay the floor slab on the top surface of the upper flange of the steel secondary beam and fix it with bolts; Step 4: Tie the floor panel reinforcement bars to the floor panel; Step 5: pour concrete into the pouring space and above the floor panel to form an integral composite structure with the support columns, main beams and floor panel.

[0015] The present invention is also characterized in that: Step 1 is to complete the steel bar binding of the support column and the main beam at the construction site, bind and weld the first connecting piece to the main beam steel bar, and install the formwork on the support column and the main beam at one time to form a continuous and closed casting space.

[0016] Step 2 specifically involves fixing the flange of the steel secondary beam to the main beam with a reserved first connecting piece.

[0017] The beneficial effects of the present invention are: The composite structure of the embedded steel secondary beam and the horse-tooth-shaped prefabricated steel plate panel of the present invention is assembled on site. The setting of the floor panel optimizes the construction system of the existing full-floor support frame, reduces the input of measures and resources, saves cross-operation time, and saves construction costs. The present invention adopts horse-tooth-shaped prefabricated steel plates as floor panels. The horse-tooth-shaped prefabricated steel plates replace the traditional temporary support system of wooden formwork as part of the permanent structure. The structure formed by the horse-tooth-shaped prefabricated steel plate floor panels, the main beams and the steel secondary beams has the characteristics of good stress-bearing performance. In addition, the use of embedded steel secondary beams to replace traditional reinforced concrete secondary beams can increase the fault tolerance of the embedded parts of the subsequent pipe supports and hangers that are not designed in time. The composite structure of the embedded steel secondary beam and the horse-tooth-shaped prefabricated steel plate panel of the present invention realizes construction optimization from the entire process of civil construction to decoration and decoration. It has the characteristics of fewer processes, less investment and less impact from adverse environmental conditions. It realizes the convenience of management of the entire process of structural construction, saves resource investment, and meets the various requirements of green and environmentally friendly construction.

[0018] The present invention's composite structural construction method, featuring pre-embedded steel secondary beams and horsetooth-shaped prefabricated steel plate panels, replaces traditional formwork systems with on-site assembly, reducing the number of construction steps and resource requirements, accelerating construction progress, and minimizing the impact of adverse environmental conditions. Furthermore, the provision of steel secondary beams improves the tolerance for subsequent additions of pre-embedded piping components due to untimely design. This construction method is quick, convenient, and resource-efficient, reducing cross-operation time, facilitating on-site construction management, and reducing management workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel of the present invention; Figure 2 It is a side view of the composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel of the present invention; Figure 3 It is a flow chart of the composite structure construction method of the embedded steel secondary beam horse tooth prefabricated steel plate panel of the present invention.

[0020] In the figure, 1. main beam; 2. first connecting member; 3. steel secondary beam; 4. floor panel; 41. tooth groove; 42. tooth top; 5. bolt; 6. concrete floor slab; 7. second connecting member. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Composite structure of embedded steel secondary beams and horse tooth prefabricated steel plate panels, such as Figure 1 As shown, it includes a main beam 1, a first connecting member 2 is embedded in the main beam 1, and the first connecting member 2 is embedded in the concrete of the main beam 1 and forms a rigid anchoring end; The steel secondary beam 3 has two ends respectively embedded in the corresponding main beam 1 and is fixedly connected to the main beam 1 through the first connecting member 2; The floor panel 4 is fixed to the top of the upper flange of the steel secondary beam 3. The floor panel 4 forms an integral force-bearing system with the main beam 1 and the steel secondary beam 3 by pouring concrete.

[0023] The main beam 1 is a cast-in-place reinforced concrete beam. The first connecting piece 2 is tied to the steel bars of the main beam 1 at positions corresponding to the steel secondary beam 3 . The steel secondary beam 3 is welded and fixed to the first connecting piece 2 .

[0024] The secondary steel beam 3 is an H-shaped steel, and the top surface of the upper flange of the secondary steel beam 3 is flush with the top surface of the main beam 1 or a thickness of the overlapping layer is reserved.

[0025] like Figure 2As shown, the floor panel 4 is arranged longitudinally along the main beam 1, and the main beam 1 is tied and welded with a second connecting member 7 at the position corresponding to the floor panel 4. The second connecting member 7 is fixedly connected to the main beam 1. The floor panel 4 is a prefabricated galvanized steel plate in the shape of a horse tooth. The floor panel 4 includes a plurality of tooth grooves 41, and the cross-sections of the plurality of tooth grooves 41 are isosceles trapezoidal or rectangular.

[0026] The thickness of the floor panel 4 is 3mm-8mm, the tooth depth of the tooth groove 41 is 0.5-1.0 times the cross-sectional height of the steel secondary beam 3, and the crests and troughs of the floor panel 4 are both provided with tooth tops 42, and the width of the tooth top 42 is 15-20cm.

[0027] A number of vertical studs 5 are provided in the contact area between the floor panel 4 and the upper flange of the steel secondary beam 3 . The rods of the studs 5 are embedded in the upper flange of the steel secondary beam 3 , and the caps of the studs 5 are buried in the cast-in-place concrete layer of the floor panel 4 .

[0028] A concrete floor slab 6 is further poured on top of the floor panel 4 to form a composite slab. After the concrete floor slab 6 is superimposed on the floor panel 4 , the bolts 5 and the steel secondary beam 3 are used to form an integral load-bearing composite slab.

[0029] Composite structure construction method of pre-buried steel secondary beam horse tooth prefabricated steel plate panel, such as Figure 3 As shown, the following steps are included: Step 1: Tie and seal the steel bars of the support column and main beam 1 to form a casting space; Step 2: hoist the secondary steel beam 3 into place and fix it to the steel bars of the main beam 1; Step 3: Lay the floor panel 4 on the top surface of the upper flange of the steel secondary beam 3 and fix it with bolts 5; Step 4, tying the floor panel reinforcement on the floor panel 4; Step 5: pour concrete into the pouring space and above the floor panel to form an integral composite structure with the support columns, main beams 1 and floor panel 4.

[0030] Step 1 is to complete the steel bar binding of the support column and the main beam 1 at the construction site, bind and weld the first connecting piece 2 to the steel bar of the main beam 1, and install the formwork on the support column and the main beam 1 at one time to form a continuous and closed casting space.

[0031] Step 2 specifically involves fixing the flange of the steel secondary beam 3 to the main beam 1 with a reserved first connecting piece 2 .

[0032] Example 1 Composite structure of embedded steel secondary beams and horse tooth prefabricated steel plate panels, such as Figure 1 As shown, it includes a main beam 1, a first connecting member 2 is embedded in the main beam 1, and the first connecting member 2 is embedded in the concrete of the main beam 1 and forms a rigid anchoring end; The steel secondary beam 3 has two ends respectively embedded in the corresponding main beam 1 and is fixedly connected to the main beam 1 through the first connecting member 2; The floor panel 4 is fixed to the top of the upper flange of the steel secondary beam 3. The floor panel 4 forms an integral force-bearing system with the main beam 1 and the steel secondary beam 3 by pouring concrete.

[0033] The main beam 1 is a cast-in-place reinforced concrete beam. The first connecting piece 2 is tied to the steel bars of the main beam 1 at positions corresponding to the steel secondary beam 3 . The steel secondary beam 3 is welded and fixed to the first connecting piece 2 .

[0034] Example 2 Composite structure of embedded steel secondary beams and horse tooth prefabricated steel plate panels, such as Figure 1 As shown, it includes a main beam 1, a first connecting member 2 is embedded in the main beam 1, and the first connecting member 2 is embedded in the concrete of the main beam 1 and forms a rigid anchoring end; The steel secondary beam 3 has two ends respectively embedded in the corresponding main beam 1 and is fixedly connected to the main beam 1 through the first connecting member 2; The floor panel 4 is fixed to the top of the upper flange of the steel secondary beam 3. The floor panel 4 forms an integral force-bearing system with the main beam 1 and the steel secondary beam 3 by pouring concrete.

[0035] The main beam 1 is a cast-in-place reinforced concrete beam. The first connecting piece 2 is tied to the steel bars of the main beam 1 at positions corresponding to the steel secondary beam 3 . The steel secondary beam 3 is welded and fixed to the first connecting piece 2 .

[0036] The secondary steel beam 3 is an H-shaped steel, and the top surface of the upper flange of the secondary steel beam 3 is flush with the top surface of the main beam 1 or a thickness of the overlapping layer is reserved.

[0037] like Figure 2 As shown, the floor panel 4 is arranged longitudinally along the main beam 1. Second connectors 7 are tied and welded to the main beam 1 at positions corresponding to the floor panel 4. The second connectors 7 are fixedly connected to the main beam 1. The floor panel 4 is a prefabricated galvanized steel sheet with a horsetooth shape. The floor panel 4 includes several tooth grooves 41, each of which has an isosceles trapezoidal or rectangular cross-section. The floor panel 4 has a thickness of 3 mm to 8 mm, and the tooth depth of the tooth grooves 41 is 0.5 to 1.0 times the cross-sectional height of the steel secondary beam 3. Tooth tops 42 are provided at both the crests and troughs of the floor panel 4, with a width of 15 to 20 cm.

[0038] Example 3 Composite structure of embedded steel secondary beams and horse tooth prefabricated steel plate panels, such as Figure 1 As shown, it includes a main beam 1, a first connecting member 2 is embedded in the main beam 1, and the first connecting member 2 is embedded in the concrete of the main beam 1 and forms a rigid anchoring end; The steel secondary beam 3 has two ends respectively embedded in the corresponding main beam 1 and is fixedly connected to the main beam 1 through the first connecting member 2; The floor panel 4 is fixed to the top of the upper flange of the steel secondary beam 3. The floor panel 4 forms an integral force-bearing system with the main beam 1 and the steel secondary beam 3 by pouring concrete.

[0039] The main beam 1 is a cast-in-place reinforced concrete beam. The first connecting piece 2 is tied to the steel bars of the main beam 1 at positions corresponding to the steel secondary beam 3 . The steel secondary beam 3 is welded and fixed to the first connecting piece 2 .

[0040] The secondary steel beam 3 is an H-shaped steel, and the top surface of the upper flange of the secondary steel beam 3 is flush with the top surface of the main beam 1 or a thickness of the overlapping layer is reserved.

[0041] like Figure 2 As shown, the floor panel 4 is arranged longitudinally along the main beam 1. Second connectors 7 are tied and welded to the main beam 1 at positions corresponding to the floor panel 4. The second connectors 7 are fixedly connected to the main beam 1. The floor panel 4 is a prefabricated galvanized steel sheet with a horsetooth shape. The floor panel 4 includes several tooth grooves 41, each of which has an isosceles trapezoidal or rectangular cross-section. The floor panel 4 has a thickness of 3 mm to 8 mm, and the tooth depth of the tooth grooves 41 is 0.5 to 1.0 times the cross-sectional height of the steel secondary beam 3. Tooth tops 42 are provided at both the crests and troughs of the floor panel 4, with a width of 15 to 20 cm.

[0042] Example 4 Composite structure of embedded steel secondary beams and horse tooth prefabricated steel plate panels, such as Figure 1 As shown, it includes a main beam 1, a first connecting member 2 is embedded in the main beam 1, and the first connecting member 2 is embedded in the concrete of the main beam 1 and forms a rigid anchoring end; The steel secondary beam 3 has two ends respectively embedded in the corresponding main beam 1 and is fixedly connected to the main beam 1 through the first connecting member 2; The floor panel 4 is fixed to the top of the upper flange of the steel secondary beam 3. The floor panel 4 forms an integral force-bearing system with the main beam 1 and the steel secondary beam 3 by pouring concrete.

[0043] The main beam 1 is a cast-in-place reinforced concrete beam. The first connecting piece 2 is tied to the steel bars of the main beam 1 at positions corresponding to the steel secondary beam 3 . The steel secondary beam 3 is welded and fixed to the first connecting piece 2 .

[0044] The secondary steel beam 3 is an H-shaped steel, and the top surface of the upper flange of the secondary steel beam 3 is flush with the top surface of the main beam 1 or a thickness of the overlapping layer is reserved.

[0045] like Figure 2As shown, the floor panel 4 is arranged longitudinally along the main beam 1. Second connectors 7 are tied and welded to the main beam 1 at positions corresponding to the floor panel 4. The second connectors 7 are fixedly connected to the main beam 1. The floor panel 4 is a prefabricated galvanized steel sheet with a horsetooth shape. The floor panel 4 includes several tooth grooves 41, each of which has an isosceles trapezoidal or rectangular cross-section. The floor panel 4 has a thickness of 3 mm to 8 mm, and the tooth depth of the tooth grooves 41 is 0.5 to 1.0 times the cross-sectional height of the steel secondary beam 3. Tooth tops 42 are provided at both the crests and troughs of the floor panel 4, with a width of 15 to 20 cm.

[0046] Several vertical studs 5 are installed in the contact area between the floor panel 4 and the upper flange of the steel secondary beam 3. The stems of the studs 5 are embedded in the upper flange of the steel secondary beam 3, and the caps of the studs 5 are embedded in the cast-in-place concrete layer of the floor panel 4. A concrete floor slab 6 is further poured on top of the floor panel 4 to form a composite slab. After the concrete floor slab 6 is superimposed on the floor panel 4, it forms an integral load-bearing composite slab with the steel secondary beam 3 through the studs 5.

[0047] Example 5 The composite structure of the pre-buried steel secondary beam and the horse tooth-shaped prefabricated steel plate panel provided in Example 4 is adopted. This embodiment provides a construction method for the composite structure of the pre-buried steel secondary beam and the horse tooth-shaped prefabricated steel plate panel, such as Figure 3 As shown, the following steps are included: Step 1: Tie and seal the steel bars of the support column and main beam 1 to form a casting space; Step 2: hoist the secondary steel beam 3 into place and fix it to the steel bars of the main beam 1; Step 3: Lay the floor panel 4 on the top surface of the upper flange of the steel secondary beam 3, and fix the steel secondary beam 3 and the floor panel 4 with bolts 5. Securely connect the floor panel 4 to the main beam 1 with the reserved second connecting piece 7. The construction of the steel secondary beam 3 is completed during the reinforcement binding stage of the main beam 1, forming a cross operation; Step 4, tying the floor panel reinforcement on the floor panel 4; Step 5: pour concrete into the pouring space and above the floor panel to form an integral composite structure with the support columns, main beams 1 and floor panel 4.

[0048] Step 1 is to complete the steel bar binding of the support column and the main beam 1 at the construction site, bind and weld the first connecting piece 2 to the steel bar of the main beam 1, and install the formwork on the support column and the main beam 1 at one time to form a continuous and closed casting space.

[0049] Step 2 specifically involves fixing the flange of the steel secondary beam 3 to the main beam 1 with a reserved first connecting piece 2 .

[0050] This construction method breaks down the previously monolithic construction of each floor of the main factory building into several units, creating a streamlined process and further shortening the construction period. The formwork and rebar binding for the support columns and main beam 1 are constructed simultaneously. After completion, the secondary steel beams 3 and floor panels 4 are then rebar-bound within each unit, followed by the unified pouring of the floor panels. Furthermore, this construction method eliminates the need for additional embedded piping components, which can be a significant time and process delay in system piping construction, resulting from delayed design in EPC projects. This method also improves the tolerance for mismatches between construction and design.

[0051] Example 6 The composite structure construction method of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel provided in Example 5 was adopted. In actual construction, this embodiment achieved the rapid construction of the main plant of the tower solar thermal project. The specific construction period was verified as follows: The height of each floor of the main plant of the tower solar thermal project is 5.5m-6m, and the deaeration area of ​​each floor is 565m 2 The control building area is 868m 2 The time taken for laying the floor panels using horse-tooth prefabricated steel plates in this construction method can save 10 days per floor compared to the composite structure construction with a wooden formwork scaffolding support system and steel secondary beams replacing traditional reinforced concrete secondary beams. The actual time taken is 2 days for installing the steel secondary beams → 1 day for hoisting the steel plates → 2 days for construction of the steel bars and concrete → 3 days for curing (overlapping with the upper floor construction). The total construction period for each floor of the main factory building is 8 days, which saves 15 days compared to the traditional wooden formwork scaffolding system (23 days / floor). After deducting the cross-operation, the net time saved in the floor structure construction is 10 days.

[0052] The main plant can save 10 days of construction time per floor. The deaeration room in the main plant has 4 floors, and the control building has 3 floors, so the total construction period of the main plant can be saved by 70 days. At the same time, the traditional construction method requires 20 scaffolders to dismantle each floor of the scaffolding for 5 days. This construction method saves the time of dismantling the scaffolding on each floor, saving a total of 35 days of cross-operation time. In addition, the traditional structure requires a full-floor scaffolding for the panel finishing of each floor, which takes 5 days. The full-floor scaffolding also has the cost of decoration and renovation. However, the invention eliminates the traditional full-floor scaffolding and directly uses the floor panel as the permanent bottom formwork. After the floor panel concrete is poured, there is no need to plaster it. Only the exposed bottom surface of the steel plate is treated with anti-corrosion treatment. After the concrete is finally set, a movable portal scaffolding is used to spray the bottom surface of the steel plate with anti-corrosion. The construction period is 2 days, saving 3 days of cross-operation time.

[0053] The composite structure construction method of the embedded steel secondary beam horse-tooth prefabricated steel plate panel of the present invention has fewer steps than the conventional method, and can effectively shorten the construction period. In addition, it has the characteristics of less investment in measures and resources and simple construction process management. The factory prefabricated structural components of this construction method have a high degree of integrated construction, a high fault tolerance rate and good overall structural stress performance, which can effectively ensure the construction quality.

[0054] Example 7 By adopting the composite structure construction method of the pre-buried steel secondary beam and the horse-tooth prefabricated steel plate panel provided in Example 5, this embodiment achieved low-cost investment in the main plant of the tower-type solar thermal project in actual construction. The specific benefits are verified as follows: The comprehensive unit price of the traditional wooden formwork full-floor scaffolding support system for subcontractors is 180 yuan / m 2 , and the comprehensive unit price of floor panel construction is 100 yuan / m 2 , then this construction method can save costs in the structural construction stage = (180-100)×(565×4+868×3)=389120 yuan.

[0055] In addition, this construction method does not require the removal of the full-floor scaffolding. The comprehensive unit price for the scaffolding removal subcontractor is RMB 8 / m 3 , if the height of each floor is measured at 5.5m, the cost of measures that can be saved = 8×(565×4+868×3)×5.5=214016 yuan, then this construction method can save the total construction cost = 389120+441364=603136 yuan, which is about 603,000 yuan.

Claims

1. The composite structure of embedded steel secondary beam and horse tooth-shaped prefabricated steel plate panel is characterized by: include: A main beam (1), wherein a first connecting member (2) is pre-buried inside the main beam (1), and the first connecting member (2) is embedded in the concrete of the main beam (1) and forms a rigid anchoring end; A steel secondary beam (3), wherein both ends of the steel secondary beam (3) are respectively embedded in the corresponding main beam (1) and are fixedly connected to the main beam (1) via the first connecting member (2); A floor panel (4) is fixed to the top of the upper flange of the steel secondary beam (3); the floor panel (4) forms an integral force-bearing system with the main beam (1) and the steel secondary beam (3) by pouring concrete.

2. The composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel according to claim 1 is characterized in that: The main beam (1) is a cast-in-situ reinforced concrete beam, the first connecting piece (2) is tied to the main beam (1) steel bars at positions corresponding to the section steel secondary beam (3), and the section steel secondary beam (3) is fixed to the first connecting piece (2) by welding.

3. The composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel according to claim 1 is characterized in that: The steel secondary beam (3) is an H-shaped steel, and the top surface of the upper flange of the steel secondary beam (3) is flush with the top surface of the main beam (1) or a thickness of the overlapping layer is reserved.

4. The composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel according to claim 1 is characterized in that: The floor panel (4) is arranged longitudinally along the main beam (1); a second connecting member (7) is tied and welded to the main beam (1) at a position corresponding to the floor panel (4); the second connecting member (7) is fixedly connected to the main beam (1); the floor panel (4) is a prefabricated galvanized steel plate in a horse tooth shape; the floor panel (4) includes a plurality of tooth grooves (41); and the cross-sections of the plurality of tooth grooves (41) are isosceles trapezoidal or rectangular.

5. The composite structure of the embedded steel secondary beam and the horse tooth-shaped prefabricated steel plate panel according to claim 4 is characterized in that: The thickness of the floor panel (4) is 3 mm to 8 mm, the tooth depth of the tooth groove (41) is 0.5 to 1.0 times the cross-sectional height of the steel secondary beam (3), and the crests and troughs of the floor panel (4) are both provided with tooth tops (42), and the width of the tooth tops (42) is 15 to 20 cm.

6. The composite structure of the embedded steel secondary beam and the horse-tooth prefabricated steel plate panel according to claim 1 is characterized in that: A plurality of vertical studs (5) are provided in the contact area between the floor panel (4) and the upper flange of the steel secondary beam (3), the rods of the studs (5) are embedded in the upper flange of the steel secondary beam (3), and the bolt caps of the studs (5) are embedded in the cast-in-place concrete layer of the floor panel (4).

7. The composite structure of the embedded steel secondary beam and the horse-tooth prefabricated steel plate panel according to claim 6 is characterized in that: A concrete floor slab (6) is further poured on top of the floor panel (4) to form a composite slab. After the concrete floor slab (6) is superimposed on the floor panel (4), the bolts (5) and the steel secondary beam (3) form an integral load-bearing composite slab.

8. A composite structure construction method of pre-buried steel secondary beams and horse-tooth prefabricated steel plate panels, characterized in that: The composite structure for constructing the prefabricated steel plate panel with embedded steel secondary beams and horse-tooth shape as claimed in claims 1 to 7 comprises the following steps: Step 1, tying the steel bars of the support column and the main beam (1) and sealing the mold to form a pouring space; Step 2: hoist the secondary steel beam (3) into place and fix it to the steel bars of the main beam (1); Step 3, laying the floor panel (4) on the top surface of the upper flange of the steel secondary beam (3) and fixing it with bolts (5); Step 4, tying the floor panel reinforcement on the floor panel (4); Step 5: pour concrete into the pouring space and above the floor panel, so that the support columns, main beams (1) and floor panel (4) form an integral composite structure.

9. The composite structure construction method of the pre-buried steel secondary beam and horse-tooth prefabricated steel plate panel according to claim 8 is characterized in that: The step 1 specifically comprises: after completing the steel bar binding of the support column and the main beam (1) at the construction site, binding and welding the first connecting piece (2) to the steel bar of the main beam (1), and installing the formwork on the support column and the main beam (1) at one time to form a continuous and closed casting space.

10. The composite structure construction method of the pre-buried steel secondary beam and horse-tooth prefabricated steel plate panel according to claim 8, characterized in that: The step 2 specifically involves fixing the flange of the steel secondary beam (3) to the main beam (1) with a reserved first connecting piece (2).

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