Novel prestressed profiled steel sheet T-shaped section large-span composite beam and construction method thereof

Abstract

The invention discloses a novel prestressed profiled steel sheet T-shaped section large-span composite beam which comprises a T-shaped section concrete beam, a connecting cover plate is embedded in the top of the T-shaped section concrete beam, a plurality of connecting pieces are fixedly installed on the connecting cover plate, and holes for the connecting pieces to penetrate through are reserved in a prestressed profiled steel sheet concrete plate. The prestressed profiled steel sheet concrete slab structure can be installed on the top of the T-shaped section concrete beam to be combined into the T-shaped section large-span composite beam, and the hole in the prestressed profiled steel sheet concrete slab structure just allows the connecting piece to penetrate into. When the connection mode of the prefabricated prestressed profiled steel sheet concrete slab and the concrete beam is considered, the design thought of'dry and wet mixed connection 'is mainly adopted, that is, on the basis of connection of connecting pieces, a high-strength and high-toughness UHPC material post-cast strip is arranged at the end connection position of the prestressed profiled steel sheet concrete slab; the composite beam structure has good overall performance and deformability, the construction progress can be effectively accelerated, and cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of large-span composite beam construction, and in particular relates to a novel prestressed pressed steel plate T-shaped cross-section large-span composite beam and a construction method thereof. Background Art

[0002] With the acceleration of urbanization, large-scale public buildings, cross-river and cross-sea bridges and other projects continue to emerge, which puts higher requirements on the performance of long-span beams. Traditional beam structures can no longer meet the comprehensive requirements of span, bearing capacity and durability of modern buildings. Therefore, it is urgent to develop a new type of long-span composite beam to improve the stability and safety of building structures. At present, the conventional corrugated steel plate-I-beam composite beam is composed of corrugated steel plate, I-beam, concrete and steel bars. The conventional practice is to place the corrugated steel plate on the upper flange of the I-beam and fix the two with rivets. Then arrange steel bars on the corrugated steel plate and pour concrete. The floor load is transmitted to the I-beam through the poured concrete slab, and then transmitted to the column or other beam by the I-beam. However, the steel beam needs to be regularly treated for rust prevention, and the resulting maintenance cost is very high. Although concrete beams have better durability than steel beams, traditional reinforced concrete beams are usually constructed by on-site casting. There are many problems with the on-site casting method, such as material waste caused by the construction process, environmental problems at the construction site, and economic efficiency problems caused by the long construction period. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a new type of prestressed corrugated steel plate T-section large-span composite beam and a construction method thereof in view of the deficiencies of the above-mentioned prior art.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0005] A new type of prestressed corrugated steel plate T-section large-span composite beam comprises a T-section concrete beam, a pre-buried connection cover plate on the top of the T-section concrete beam, a plurality of connectors fixedly installed on the connection cover plate, holes reserved for the connectors to pass through on the prestressed corrugated steel plate concrete slab, the prestressed corrugated steel plate concrete slab can be installed on the top of the T-section concrete beam to form a T-section large-span composite beam, the holes on the prestressed corrugated steel plate concrete slab are just for the connectors to pass through, UHPC material is later poured into the holes to seal the connectors, so that the prestressed corrugated steel plate concrete slab is fixedly connected to the T-section concrete beam.

[0006] To optimize the above technical solutions, the specific measures taken also include:

[0007] The above-mentioned beam reinforcement binding is composed of two reinforcement cages, one large and one small. The small reinforcement cage is located above the large reinforcement cage. There are two connecting covers, which are arranged on the upper surface of the large reinforcement cage. The connecting covers are respectively located on the left and right sides of the small reinforcement cage. The connecting parts are embedded in the connecting covers. Concrete is poured into the two reinforcement cages to form a T-shaped cross-section concrete beam with a top beam and a bottom beam.

[0008] There are two prestressed corrugated steel plate concrete slabs with the same structure, which are respectively arranged on the left and right sides of the T-shaped cross-section concrete beam. The prestressed corrugated steel plate concrete slabs include a corrugated steel plate and prestressed reinforced concrete cast on the corrugated steel plate. The length of the prestressed reinforced concrete on the prestressed corrugated steel plate concrete slab near one end of the T-shaped cross-section concrete beam is shorter than that of the corrugated steel plate, so that a post-casting area is formed between the top beam and the prestressed corrugated steel plate concrete slab. The corrugated steel plate is provided with a steel plate hole in the post-casting area, and the connecting piece can pass through the steel plate hole to connect with the corrugated steel plate. UHPC material is cast in the post-casting area to seal the steel plate hole and the connecting piece, so as to connect the top beam and the prestressed corrugated steel plate concrete slab as a whole.

[0009] A plugging plate is arranged on the top of the bottom beam, and the shape of the plugging plate is adapted to the shape of one end of the corrugated steel plate close to the T-section concrete beam. When the corrugated steel plate is against the plugging plate, the connecting piece is aligned with the steel plate hole on the corrugated steel plate.

[0010] The prestressed reinforced concrete on the above-mentioned prestressed profiled steel plate concrete slab is composed of bidirectional steel mesh cast concrete. A channel for the unbonded prestressed tendons to pass through is reserved on the prestressed profiled steel plate concrete slab. After the unbonded prestressed tendons are inserted into the channel and prestress is tensioned, concrete is poured in the channel to give the prestressed profiled steel plate concrete slab prestress.

[0011] The above-mentioned connecting cover plate is provided with an I-shaped steel beam, and a steel beam hole for high-strength bolts to pass through is reserved at the lower flange of the I-shaped steel beam, and a connecting piece is welded on the surface of the upper flange of the I-shaped steel beam, and a high-strength bolt is arranged on the connecting cover plate, and the high-strength bolt passes through the steel beam hole and is fixedly connected to the I-shaped steel beam. There are two prestressed pressed steel plate concrete slabs with the same structure, which are respectively arranged on the left and right sides of the T-shaped cross-section concrete beam. The prestressed pressed steel plate concrete slab includes a pressed steel plate and prestressed reinforced concrete poured on the pressed steel plate. The prestressed pressed steel plate concrete slab is placed on the top of the I-shaped steel beam, and the prestressed pressed steel plate concrete slab is provided with prestressed pressed steel plate concrete slab holes that pass through the upper and lower parts, and the connecting piece can pass through the prestressed pressed steel plate concrete slab hole to connect with the prestressed pressed steel plate concrete slab, concrete is poured in the prestressed pressed steel plate concrete slab, and the connecting piece is sealed to connect the T-shaped cross-section concrete beam, the I-shaped steel beam and the prestressed pressed steel plate concrete slab as a whole.

[0012] The prestressed reinforced concrete on the above-mentioned prestressed profiled steel plate concrete slab is composed of bidirectional steel mesh cast concrete, and a channel for the unbonded prestressed tendons to pass through is reserved on the prestressed profiled steel plate concrete slab. After the unbonded prestressed tendons are inserted into the channel and prestressed, concrete is cast in the channel to make the prestressed profiled steel plate concrete slab have prestress, and a UHPC material post-casting strip is reserved between the left and right prestressed profiled steel plate concrete slabs, and the bidirectional steel mesh is extended to the post-casting strip to extend the stressed steel bars, and the stressed steel bars of the left and right prestressed profiled steel plate concrete slabs are connected by a sleeve, and then the UHPC material is cast in the post-casting strip to fix the left and right prestressed profiled steel plate concrete slabs as a whole.

[0013] The I-shaped steel beam and the connecting cover plate are also fixed to each other via angle steel.

[0014] A construction method for a novel prestressed press-formed steel plate T-section large-span composite beam, preparing the above-mentioned T-section large-span composite beam, comprises the following steps:

[0015] Step 1: Use beam reinforcement to tie two reinforcement cages, one large and one small, place a connection cover plate on the top of the large reinforcement cage, embed the connector in the connection cover plate, and then pour concrete on the reinforcement cage to form a T-shaped concrete beam;

[0016] Step 2: Place the prestressed profiled steel plate concrete slab according to the position of the embedded connector of the T-section concrete beam, align the steel plate holes of the profiled steel plate with the connector, install nuts on the connector and tighten them to achieve the connection between the prestressed profiled steel plate concrete slab and the T-section concrete beam;

[0017] Step 3: Pass the unbonded prestressed tendons through the holes on the prestressed profiled steel plate concrete slab, the unbonded prestressed tendons are bidirectionally symmetrically distributed in the prestressed profiled steel plate concrete slab, the prestressed tendons are tensioned and anchored with anchors; then, cement mortar is injected into the holes through which the unbonded prestressed tendons pass to prevent rust;

[0018] Step 4: Cast UHPC material in the post-casting area, seal the steel plate holes and connectors, and connect the T-section concrete beam with the prestressed profiled steel plate concrete slab.

[0019] A construction method for a novel prestressed press-formed steel plate T-section large-span composite beam, preparing the above-mentioned T-section large-span composite beam, comprises the following steps:

[0020] Step 1: Use beam reinforcement to tie two reinforcement cages, one large and one small, place a connection cover plate on the top of the large reinforcement cage, embed the connector in the connection cover plate, and then pour concrete on the reinforcement cage to form a T-shaped concrete beam;

[0021] Step 2: Arrange I-shaped steel beams according to the designed position and spacing. Connect the I-shaped steel beams to the connecting cover plates through high-strength bolts, and weld the connecting parts on the upper flange surface of the I-shaped steel beams.

[0022] Step 3: Place the prestressed steel plate concrete slab according to the position of the connector of the U-shaped steel beam. Align the holes of the prestressed steel plate concrete slab with the connector, install nuts on the connector and tighten them.

[0023] Step 4: Connect the stress-bearing steel bars between the left and right prestressed steel plate concrete slabs through sleeves.

[0024] Step 5: Pass the unbonded prestressed tendons through the holes on the prestressed profiled steel plate concrete slab, the unbonded prestressed tendons are bidirectionally symmetrically distributed in the prestressed profiled steel plate concrete slab, the prestressed tendons are tensioned and anchored with anchors; then, cement mortar is injected into the holes through which the unbonded prestressed tendons pass to prevent rust;

[0025] Step 6: Pour concrete into the holes of the prestressed steel plate concrete slab, seal the connectors, and connect the T-section concrete beam, I-shaped steel beam and the prestressed steel plate concrete slab into one; pour UHPC material in the post-cast strip to fix the left and right prestressed steel plate concrete slabs into one.

[0026] The beneficial effects of the present invention are:

[0027] 1. When considering the connection method between the prefabricated prestressed corrugated steel plate concrete slab and the concrete beam, the present invention mainly adopts the design concept of "dry-wet mixed connection", that is, on the basis of the connection of the connector, a high-strength and high-toughness UHPC material post-cast strip is set at the end connection of the prestressed corrugated steel plate concrete slab, so that the connection structure has good overall performance and deformation capacity, and can effectively speed up the construction progress and save costs, providing a new idea for the application of large-span composite beams. The compressive strength of UHPC far exceeds that of traditional concrete, and it has excellent waterproof, anti-corrosion and chemical erosion resistance, which makes it perform well when subjected to high loads and harsh environments. The high-strength and high-toughness UHPC material is used in the post-cast strip area to enhance the long-term durability and safety of the structure and reduce the cost of repair and maintenance. At the same time, the amount of steel bars in the post-cast section area can be reduced, and the UHPC material itself is also lighter than ordinary concrete, which achieves lightweight structure and reduces construction load.

[0028] 2. The present invention arranges prestressed tendons in the traditional corrugated steel plate concrete slab, passes the prestressed tendons through the reserved channels in the corrugated steel plate concrete slab, tensions the prestressed tendons and injects cement mortar into the channels to prevent rust. The prestressed tendons provide prestressed stress to the corrugated steel plate concrete slab, effectively controls the development of concrete cracks, and further improves the bearing capacity of the corrugated steel plate concrete slab. This prestressed corrugated steel plate concrete slab has the advantages of greater rigidity, higher crack resistance and good durability, and has good application prospects in large-span structures.

[0029] 3. The application of the new prestressed corrugated steel plate T-section composite beam in the negative moment area also has its own structural advantages. In the negative moment area, the structure mainly bears upward bending moment, and the corrugated steel plate has high tensile and bending strength and can withstand large loads; the prestressed tendons can bear part of the tensile stress in the negative moment area, reducing the tensile stress of the concrete slab, thereby delaying the generation of cracks.

[0030] 4. In the second embodiment of the present invention, the outrigger steel beam-embedded stud connection mode arranges I-beams and angle steels at intervals in the longitudinal direction of the composite beam, which greatly increases the longitudinal stiffness of the composite beam and better meets the deformation requirements of the large-span structure. This connection mode allows the outrigger steel beam to be arranged flexibly, while increasing the bending and shear bearing capacity of the composite beam.

[0031] 5. The present invention can hoist the prestressed steel plate concrete slab, T-section concrete beam and I-shaped steel beam separately and then assemble them, thereby reducing the hoisting and transportation weight and making construction more convenient.

[0032] 6. The new prestressed corrugated steel plate T-section composite beam of the present invention adopts reinforcing measures such as embedded bolts and I-beams to ensure the interaction between the prestressed corrugated steel plate concrete slab and the concrete beam, so that the two can work together and give full play to the respective advantages of the corrugated steel plate, concrete and prestressed tendons. This new composite beam has a higher bending and shear bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the pre-embedded bolt-post-cast UHPC connection method in the first embodiment of the present invention;

[0034] Figure 2 for Figure 1 AA section view;

[0035] Figure 3 for Figure 1 A top view of

[0036] Figure 4 It is a schematic diagram of the connection mode between the outwardly extending steel beam and the embedded bolts in the second embodiment of the present invention;

[0037] Figure 5 yes Figure 4 BB cross-sectional view;

[0038] Figure 6 yes Figure 4 Top view of the .

[0039] The accompanying drawings are marked as follows: T-section concrete beam 1, top beam 1a, bottom beam 1b, beam reinforcement 2, bidirectional reinforcement mesh 3, prestressed corrugated steel plate concrete slab 4, corrugated steel plate 5, unbonded prestressed tendons 6, connecting cover plate 7, connecting piece 8, post-cast UHPC material 9, plug plate 10, anchor 11, high-strength bolts 12, I-beam steel beam 13, angle steel 14, sleeve 15. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0041] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0043] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" / "several" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0044] According to the structural characteristics of the T-section concrete beam, the present invention adopts a "dry-wet mixed connection" when designing the connection method of the prefabricated prestressed steel plate concrete slab 4 and the T-section concrete beam, and reserves a post-cast strip by exposing the profiled steel plate at the end of the prefabricated prestressed steel plate concrete slab 4. The connection methods between the prefabricated prestressed steel plate concrete slab 4 and the T-section concrete beam include embedded bolts / studs-post-cast UHPC connection and extended steel beam-embedded studs connection.

[0045] The following will take the embedded bolt-post-cast UHPC connection method as the first embodiment and the extended steel beam-embedded stud connection method as the second embodiment for detailed explanation.

[0046] First embodiment: pre-embedded bolt-post-cast UHPC connection method, such as Figure 1-3 As shown,

[0047] Component production:

[0048] The beam reinforcement 2 is tied to form a reinforcement cage, the reinforcement cage is large and small, the small reinforcement cage is located above the large reinforcement cage, and a connecting cover plate 7 with embedded connecting parts 8 is placed on the top of the beam reinforcement 2. The connecting parts 8 are high-strength bolts, and the connecting cover plate 7 is a steel cover plate. Concrete is poured to form a T-section concrete beam 1 with embedded connecting cover plate 7; the corrugated steel plate 5 is selected according to the design requirements, and the upper bidirectional steel mesh 3 is tied. The corrugated steel plate 5 of the prestressed corrugated steel plate concrete slab 4 is close to one end of the T-section concrete beam 1. The exposed corrugated steel plate 5 reserves a hole for the connecting parts 8 to pass through, and a channel for the non-bonded prestressed tendons 6 to pass through is reserved in the prestressed corrugated steel plate concrete slab 4, and concrete is poured to form a prestressed corrugated steel plate concrete slab 4 with the end corrugated steel plate 5 exposed.

[0049] Component Installation:

[0050] First, two steel cages, one large and one small, are tied with beam reinforcement 2, a connecting cover plate 7 is placed on the top of the large steel cage, and a connecting piece 8 is pre-embedded in the connecting cover plate 7, and then concrete is poured into the steel cage to form a prefabricated T-section concrete beam 1; according to the position of the pre-embedded connecting piece 8 of the T-section concrete beam 1, the prestressed profiled steel plate concrete slab 4 is placed, the bolt holes of the exposed profiled steel plate 5 at the end of the prestressed profiled steel plate concrete slab 4 are aligned with the connecting piece 8, and the nuts are tightened to achieve the connection between the prestressed profiled steel plate concrete slab 4 and the concrete beam 1; secondly, the unbonded prestressed tendons 6 are passed through the reserved channels of the prestressed profiled steel plate concrete slab 4, and the unbonded prestressed tendons 6 are bidirectionally symmetrically distributed in the prestressed profiled steel plate concrete slab 4, and the prestressed tendons are tensioned and anchored with anchors 11; then cement mortar is injected into the channels through which the unbonded prestressed tendons 6 pass to prevent rust; finally, UHPC material 9 is poured in the post-cast strip.

[0051] Second embodiment: the connection method of the extended steel beam and the embedded bolts, such as Figure 4-6 Shown

[0052] Component production:

[0053] First, the beam reinforcement 2 is tied to form a reinforcement cage, the reinforcement cage is large and small, the small reinforcement cage is located above the large reinforcement cage, a T-shaped connection cover plate 7 and a high-strength bolt 12 are embedded on the top of the beam reinforcement, the high-strength bolt 12 is welded on the top of the T-shaped connection cover plate 7, and concrete is poured to form a T-shaped cross-section concrete beam 1 with embedded T-shaped connection cover plate 7; an I-shaped steel beam 13 is made according to the design requirements, and holes are reserved at the end of the I-shaped steel beam 13 for the high-strength bolt 12 to pass through. At the same time, a connector 8 is welded on the upper flange surface, and the connector 8 is a bolt. According to the design requirements, a corrugated steel plate 5 is selected, and the upper bidirectional steel mesh 3 is tied. The upper stress-bearing steel bars of the bidirectional steel mesh 3 extend out of the edge of the prestressed corrugated steel plate concrete slab 4. A hole for the connector 8 and the unbonded prestressed tendons 6 to pass through is reserved on the prestressed corrugated steel plate concrete slab 4, and concrete is poured to form a prestressed corrugated steel plate concrete slab 4 with reserved bolt holes.

[0054] Component Installation:

[0055] First, according to the design position and spacing, the extended I-shaped steel beam 13 is arranged, and the I-shaped steel beam 13 is connected to the T-shaped connection cover plate 7 through the angle steel 14 and the high-strength bolt 12; secondly, the prestressed steel plate concrete slab 4 is placed on the top of the I-shaped steel beam 13, and the reserved bolt holes of the prestressed steel plate concrete slab 4 are aligned with the connector 8 welded to the flange of the steel beam 13. A post-casting strip is left between the prestressed steel plate concrete slabs and the extended stress-bearing steel bars 3 are connected through the sleeve 15; then the unbonded prestressed tendons 6 are passed through the reserved channels of the prestressed steel plate concrete slab 4, and the unbonded prestressed tendons 6 are bidirectionally symmetrically distributed in the prestressed steel plate concrete slab 4, and the prestressed tendons 6 are tensioned and anchored with anchors 11; then cement mortar is injected into the channels of the prestressed tendons 6 to prevent rust; finally, UHPC material 9 is poured in the bolt holes and post-casting strips. This connection method increases the bearing capacity of the horizontal component, and the extended steel beam is flexible in arrangement.

[0056] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solution described in the implementation of the calculation method of the present invention. Ordinary technicians in the field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effect; as long as the requirements of the calculation method are met, they are all within the protection scope of the present invention.

Claims

1. A novel prestressed steel plate T-section long-span composite beam, comprising a T-section concrete beam (1), characterized in that: A connecting cover plate (7) is pre-buried on the top of the T-section concrete beam (1), and a plurality of connecting pieces (8) are fixedly mounted on the connecting cover plate (7). Holes are reserved on the prestressed steel plate concrete slab (4) for the connecting pieces (8) to pass through. The prestressed steel plate prestressed steel plate concrete slab (4) can be installed on the top of the T-section concrete beam (1) to form a T-section large-span composite beam. The holes on the prestressed steel plate concrete slab (4) are just for the connecting pieces (8) to pass through. UHPC material is then poured into the holes to seal the connecting pieces (8), so that the prestressed steel plate concrete slab (4) is fixedly connected to the T-section concrete beam (1).

2. The novel prestressed corrugated steel plate T-section large span composite beam according to claim 1 is characterized in that: The beam reinforcement (2) is tied to form two reinforcement cages, one large and one small. The small reinforcement cage is located above the large reinforcement cage. There are two connection covers (7) arranged on the upper surface of the large reinforcement cage. The connection covers (7) are respectively located on the left and right sides of the small reinforcement cage. The connection pieces (8) are pre-buried in the connection covers (7). The two reinforcement cages are poured with concrete to form a T-shaped cross-section concrete beam (1) having a top beam (1a) and a bottom beam (1b).

3. The novel prestressed pressed steel plate T-section large span composite beam according to claim 2 is characterized by: There are two prestressed profiled steel plate concrete slabs (4) with the same structure, which are respectively arranged on the left and right sides of the T-shaped cross-section concrete beam (1). The prestressed profiled steel plate concrete slabs (4) include a profiled steel plate (5) and prestressed reinforced concrete cast on the profiled steel plate (5). The prestressed reinforced concrete on the prestressed profiled steel plate concrete slab (4) close to one end of the T-shaped cross-section concrete beam (1) is shorter than the profiled steel plate (5), so that a post-casting area is formed between the top beam (1a) and the prestressed profiled steel plate concrete slab (4). The profiled steel plate (5) is provided with a steel plate hole in the post-casting area, and the connecting piece (8) can pass through the steel plate hole to connect with the profiled steel plate (5). The UHPC material is cast in the post-casting area to seal the steel plate hole and the connecting piece (8), so that the top beam (1a) and the prestressed profiled steel plate concrete slab (4) are connected as a whole.

4. The novel prestressed corrugated steel plate T-section large-span composite beam according to claim 3 is characterized by: A plugging plate (10) is provided on the top of the bottom beam (1b), and the shape of the plugging plate (10) is adapted to the shape of one end of the corrugated steel plate (5) close to the T-section concrete beam (1). When the corrugated steel plate (5) is against the plugging plate (10), the connecting piece (8) is aligned with the steel plate hole on the corrugated steel plate (5).

5. The novel prestressed corrugated steel plate T-section large span composite beam according to claim 4 is characterized in that: The prestressed reinforced concrete on the prestressed profiled steel plate concrete slab (4) is composed of a bidirectional steel mesh (3) cast in concrete. A hole is reserved on the prestressed profiled steel plate concrete slab (4) for the non-bonded prestressed tendons (6) to pass through. After the non-bonded prestressed tendons (6) are inserted into the hole and prestressed, concrete is cast in the hole so that the prestressed profiled steel plate concrete slab (4) has prestress.

6. The novel prestressed corrugated steel plate T-section large span composite beam according to claim 2 is characterized by: The connecting cover plate (7) is provided with an I-shaped steel beam (13), the lower flange of the I-shaped steel beam (13) is reserved with a steel beam hole for a high-strength bolt (12) to pass through, the upper flange surface of the I-shaped steel beam (13) is welded with a connecting piece (8), the connecting cover plate (7) is provided with a high-strength bolt (12), the high-strength bolt (12) passes through the steel beam hole and is fixedly connected to the I-shaped steel beam (13), the prestressed steel plate concrete slab (4) has two, the same structure, and is respectively arranged on the left and right sides of the T-shaped cross-section concrete beam (1), the prestressed steel plate concrete slab (4) includes a profiled steel plate (5) and prestressed reinforced concrete cast on a corrugated steel plate (5); the prestressed corrugated steel plate concrete plate (4) is placed on top of an I-shaped steel beam (13); a prestressed corrugated steel plate concrete plate hole is provided on the prestressed corrugated steel plate concrete plate (4) and penetrates from top to bottom; a connecting piece (8) can pass through the prestressed corrugated steel plate concrete plate hole and connect with the prestressed corrugated steel plate concrete plate (4); concrete is cast in the prestressed corrugated steel plate concrete plate hole to seal the connecting piece (8) and connect the T-shaped concrete beam (1), the I-shaped steel beam (13) and the prestressed corrugated steel plate concrete plate (4) as a whole.

7. The novel prestressed corrugated steel plate T-section large span composite beam according to claim 6 is characterized by: The prestressed reinforced concrete on the prestressed profiled steel plate concrete slab (4) is composed of a bidirectional steel mesh (3) cast concrete, a hole is reserved on the prestressed profiled steel plate concrete slab (4) for the unbonded prestressed tendons (6) to pass through, after the unbonded prestressed tendons (6) are inserted into the hole and prestressed, concrete is cast in the hole so that the prestressed profiled steel plate concrete slab (4) has prestress, a post-cast strip is reserved between the left and right prestressed profiled steel plate concrete slabs (4) and the bidirectional steel mesh (3) extends the stressed steel bars to the post-cast strip, the stressed steel bars of the left and right prestressed profiled steel plate concrete slabs (4) are connected through a sleeve (15), and then UHPC material is cast in the post-cast strip to fix the left and right prestressed profiled steel plate concrete slabs (4) into one body.

8. The novel prestressed corrugated steel plate T-section large span composite beam according to claim 7 is characterized in that: The I-shaped steel beam (13) and the connecting cover plate (7) are fixed to each other via angle steel (14).

9. The construction method of a new type of prestressed pressed steel plate T-section large-span composite beam is characterized by: The preparation of the T-section long-span composite beam as claimed in claim 4 comprises the following steps: Step 1: Use beam reinforcement (2) to tie two reinforcement cages, one large and one small, place a connecting cover plate (7) on the top of the large reinforcement cage, embed the connecting piece (8) in the connecting cover plate (7), and then pour concrete on the reinforcement cage to form a T-shaped cross-section concrete beam (1); Step 2: according to the position of the embedded connector (8) of the T-section concrete beam (1), the prestressed profiled steel plate concrete slab (4) is placed, the steel plate holes of the profiled steel plate (5) are aligned with the connector (8), and nuts are installed on the connector (8) and tightened to achieve the connection between the prestressed profiled steel plate concrete slab (4) and the T-section concrete beam (1); Step 3: Pass the unbonded prestressed tendons (6) through the holes on the prestressed profiled steel plate concrete slab (4), and the unbonded prestressed tendons (6) are distributed bidirectionally and symmetrically in the prestressed profiled steel plate concrete slab (4). The prestressed tendons are tensioned and anchored with anchors; then, cement mortar is injected into the holes through which the unbonded prestressed tendons (6) pass to prevent rust; Step 4: Cast UHPC material in the post-casting area, seal the steel plate holes and connectors (8), and connect the T-section concrete beam (1) and the prestressed profiled steel plate concrete slab (4) into one.

10. The construction method of a new type of prestressed pressed steel plate T-section large-span composite beam is characterized by: The preparation of the T-section long-span composite beam as claimed in claim 7 comprises the following steps: Step 1: Use beam reinforcement (2) to tie two reinforcement cages, one large and one small, place a connecting cover plate (7) on the top of the large reinforcement cage, embed the connecting piece (8) in the connecting cover plate (7), and then pour concrete on the reinforcement cage to form a T-shaped cross-section concrete beam (1); Step 2: Arrange the I-shaped steel beam (13) according to the designed position and spacing, connect the I-shaped steel beam (13) to the connecting cover plate (7) through high-strength bolts (12), and weld the connecting piece (8) on the upper flange surface of the I-shaped steel beam (13). Step 3: Place the prestressed steel plate concrete slab (4) according to the position of the connecting piece (8) of the U-shaped steel beam (13), align the prestressed steel plate concrete slab holes on the prestressed steel plate concrete slab (4) with the connecting piece (8), install nuts on the connecting piece (8) and tighten them. Step 4: The stress-bearing steel bars between the left and right prestressed steel plate concrete slabs (4) are connected via sleeves (15). Step 5: Pass the unbonded prestressed tendons (6) through the holes on the prestressed profiled steel plate concrete slab (4); the unbonded prestressed tendons (6) are bidirectionally symmetrically distributed in the prestressed profiled steel plate concrete slab (4); the prestressed tendons are tensioned and anchored with anchors; then, cement mortar is injected into the holes through which the unbonded prestressed tendons (6) pass to prevent rust; Step 6: pour concrete into the holes of the prestressed profiled steel plate concrete slab, seal the connector (8), and connect the T-shaped concrete beam (1), the I-shaped steel beam (13) and the prestressed profiled steel plate concrete slab (4) into one; pour UHPC material into the post-cast strip to fix the left and right prestressed profiled steel plate concrete slabs (4) into one.

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