Inverted T-shaped steel-UHPC (Ultra High Performance Concrete) composite board

Abstract

The invention relates to the technical field of bridge components, and provides an inverted T-shaped steel-UHPC composite board. Comprising UHPC boards and a plurality of pieces of inverted T-shaped steel arranged at intervals in the longitudinal bridge direction, and the UHPC boards are arranged on the inverted T-shaped steel arranged at intervals in the longitudinal bridge direction; a steel plate piece is arranged between the bottom of the UHPC plate and the upper portion of a web of the inverted-T-shaped steel. The upper surface of the steel plate piece is fixedly connected with the UHPC plate, and the lower surface of the steel plate piece is connected with the web plate. The inverted-T-shaped steel-UHPC composite board has the advantages that an upper flange plate of H-shaped steel is omitted, the weight of longitudinal ribs of the UHPC composite board can be reduced by more than 1 / 3 through the inverted-T-shaped steel, and therefore the dead weight of an inverted-T-shaped steel-UHPC composite bridge deck slab system is lighter, and the inverted-T-shaped steel-UHPC composite bridge deck slab system can be suitable for large-span bridges such as suspension bridges sensitive to the dead weight height.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge components, and particularly relates to an inverted T-shaped steel-UHPC composite slab. Background Art

[0002] Long-span bridges are symbols reflecting a country's scientific and technological level. Steel structure bridges have the advantages of light self-weight, large spanning capacity, good seismic performance, etc., and are the first choice for long-span bridges. The deck structure of steel bridges usually adopts an orthotropic steel deck system. However, since the steel deck is a fully welded structure, not only is the cost high, but under the action of heavy-duty vehicles, the steel deck system is troubled by two major diseases: (1) Fatigue cracking and local buckling of the steel bridge deck endanger the safety of the bridge; (2) Frequent damage to the asphalt pavement and huge renovation costs. The above diseases reduce the operating efficiency of the bridge and are recognized worldwide problems in the field of steel bridges. In China, the traffic volume of heavy-duty vehicles is large, and the above diseases are particularly serious.

[0003] To address the above problems, the emergence of the orthotropic steel plate-UHPC (Ultra-High Performance Concrete, UHPC, hereinafter referred to as UHPC) lightweight composite bridge deck has greatly improved the deck stiffness and reduced the risks of fatigue cracking and pavement damage. This achievement has been applied to more than 100 actual bridges in China, and so far, none of them have shown diseases and the response is good. However, since the UHPC lightweight composite bridge deck does not cancel the orthotropic steel bridge deck, the cost of this deck structure is still high. Moreover, the UHPC layer has an obvious stress reduction effect on the connection details with the U-ribs, but for other details, the reduction degree is not large enough. Therefore, theoretically, the risk of fatigue cracking of the steel deck cannot be completely eliminated. In patents CN109338866A and CN109610310A, a new type of steel-UHPC composite slab is proposed, but there is still much room for optimization in the structure of this steel-UHPC composite slab. For example, in the steel-UHPC composite bridge deck, the function of the upper flange plate of the steel section is to transfer the horizontal shear force between the UHPC slab and the steel section, and at the same time support the bottom surface of the UHPC slab. However, because the upper flange plate is close to the neutral axis, the contribution of the upper flange plate to the moment of inertia for bending is small.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an inverted T-shaped steel-UHPC composite slab to solve the technical problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: an inverted T-shaped steel-UHPC composite slab, comprising: a UHPC slab and a plurality of inverted T-shaped steels arranged at intervals along the longitudinal bridge direction, and the UHPC slab is arranged on the plurality of inverted T-shaped steels arranged at intervals along the longitudinal bridge direction;

[0007] A steel plate member is provided between the bottom of the UHPC plate and the upper part of the web of the inverted T-shaped steel. The upper surface of the steel plate member is fixedly connected to the UHPC plate, and the lower surface of the steel plate member is connected to the web.

[0008] In an alternative embodiment, the steel plate member is a steel plate strip, and a plurality of the steel plate strips are arranged along the transverse direction of the bridge.

[0009] In an alternative embodiment, the steel plate member is a whole steel plate, and a plurality of groups of through holes are provided on the steel plate, and each group of the through holes is arranged along the transverse direction of the bridge.

[0010] In an alternative embodiment, a first special-shaped notch is formed at the top of the web of the inverted T-shaped steel, and adjacent first special-shaped notches are mirror images of each other.

[0011] On both sides of each first special-shaped notch, a first protrusion and a second protrusion are respectively formed. The first protrusion, the first special-shaped notch, and the upper surface of the steel plate strip are connected to the UHPC plate. The upper surface of the second protrusion is connected to the lower surface of the steel plate strip, and the height of the first protrusion is greater than the height of the second protrusion; or,

[0012] A second special-shaped notch is formed at the top of the web of the inverted T-shaped steel, and adjacent second special-shaped notches are mirror images of each other.

[0013] On both sides of each second special-shaped notch, a third protrusion and a fourth protrusion are respectively formed. The second protrusion, the second special-shaped notch, and the upper surface of the steel plate strip are connected to the UHPC plate. The upper surface of the fourth protrusion is connected to the lower surface of the steel plate strip, and the height of the third protrusion is greater than the height of the fourth protrusion.

[0014] In an alternative embodiment, a first special-shaped notch is formed at the top of the web of the inverted T-shaped steel, and adjacent first special-shaped notches are mirror images of each other.

[0015] On both sides of each first special-shaped notch, a first protrusion and a second protrusion are respectively formed. The first protrusion, the first special-shaped notch, and the upper surface of the steel plate are connected to the UHPC plate. The upper surface of the second protrusion is connected to the lower surface of the steel plate, and the height of the first protrusion is greater than the height of the second protrusion, wherein the first protrusion passes through the through hole; or,

[0016] A second special-shaped notch is formed at the top of the web of the inverted T-shaped steel, and adjacent second special-shaped notches are mirror images of each other.

[0017] On both sides of each second special-shaped notch, a third protrusion and a fourth protrusion are respectively formed. The second protrusion, the second special-shaped notch, the upper surface of the steel plate are connected to the UHPC plate, the upper surface of the fourth protrusion is connected to the lower surface of the steel plate, and the height of the third protrusion is greater than that of the fourth protrusion. Among them, the first protrusion passes through the through hole.

[0018] In an alternative embodiment, the first special-shaped notch is trapezoidal, and the second special-shaped notch is arc-shaped.

[0019] In an alternative embodiment, the connection between the UHPC plate and the web is thickened to form a thickened portion;

[0020] A plurality of first shear connectors are arranged on the lower surface of the steel plate member, and the plurality of first shear connectors connect the thickened portion.

[0021] In an alternative embodiment, a plurality of second shear connectors for connecting with the UHPC plate are arranged on the upper surface of the steel plate member.

[0022] In an alternative embodiment, the inverted T-shaped steel is a finished T-shaped steel or is formed by cutting an H-shaped steel in half.

[0023] In an alternative embodiment, a single-layer steel mesh is embedded in the UHPC plate, and the steel mesh is formed by alternately laying transverse steel bars and longitudinal steel bars.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) The stress of the bridge deck is relatively complex, and its stress behavior is divided into 3 systems. The first system is the main beam system, the second system is the bridge deck system, and the third system is the cover plate system. In a conventional orthotropic steel bridge deck, the first system is the steel main beam, the second system is the steel bridge deck with U ribs, and the third system is a pure steel plate. In the present invention, the first system is a combined structure of a steel main beam and a composite bridge deck, the second system is a combined bridge deck structure of an inverted T-shaped steel and a UHPC plate, and the third system is a combined structure of a steel strip or a steel plate and a UHPC plate. All three systems are combined structures for stress. There are many applications of combined structures in bridge structures because combined structures can give full play to the advantages of each material and achieve the effect of 1 + 1 > 2. The present invention uses combined structures in the stress of all 3 systems, and its mechanical and economic advantages are obvious.

[0026] (2) In the inverted T-shaped steel-UHPC composite slab of the present invention, the upper flange plate of the H-shaped steel is cancelled, and an inverted T-shaped steel (the inverted T-shaped steel is a finished T-shaped steel or is formed by cutting an H-shaped steel in half) is used, reducing the weight of the longitudinal ribs of the UHPC composite slab by more than 1 / 3, so that the self-weight of the inverted T-shaped steel-UHPC system is lighter, and thus it can be applied to long-span bridges such as suspension bridges that are highly sensitive to self-weight.

[0027] (3) In the inverted T-shaped steel-UHPC composite slab of the present invention, the upper part of the web of the T-shaped steel is cut to form a first convex part, a second convex part and a special-shaped notch. The first convex part is used for anchoring, and the special-shaped notch and the UHPC slab form a mortise and tenon to transfer the horizontal shear force. The steel plate member (steel strip or whole steel plate) is arranged on the second convex part, which can share the horizontal shear force and vertical shear force between the UHPC slab and the web of the inverted T-shaped steel at the same time, and improve the mechanical performance of the structure.

[0028] (4) The web of the inverted T-shaped steel in the present invention is inserted into the UHPC slab, and the UHPC slab is thickened at the connection with the web to form a thickened part, which can ensure reliable shear force transfer and the required insertion depth, and can also ensure that the layout of transverse steel bars is not affected. It is worth mentioning that stud bolts connected to the thickened part of the lower UHPC can be welded under the steel plate member to ensure the mechanical performance of the UHPC slab in the thickened treatment section. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 Structural schematic diagram of an inverted T-shaped steel-UHPC composite slab with a transverse steel strip on the bottom surface of the UHPC slab provided by an embodiment of the present invention (stud bolts are not arranged under the steel strip in the thickened section).

[0031] Figure 2 Structural schematic diagram of an inverted T-shaped steel-UHPC composite slab with a whole steel plate on the bottom surface of the UHPC slab provided by an embodiment of the present invention (stud bolts are not arranged under the steel plate in the thickened section).

[0032] Figure 3 For Figure 2 structural schematic diagram of the whole steel plate in

[0033] Figure 4 For Figure 1 、 Figure 2 A-A cross-sectional view in

[0034] Figure 5 For Figure 1 B-B cross-sectional view in

[0035] Figure 6 For Figure 2 B-B cross-sectional view in

[0036] Figure 7 For Figure 1Cross-sectional view in the C-C direction (the cut is the first special-shaped cut).

[0037] Figure 8 is Figure 2 Cross-sectional view in the C-C direction (the cut is the first special-shaped cut).

[0038] Figure 9 is Figure 1 、 Figure 2 Side structure diagram of the T-shaped steel in (the cut is the first special-shaped cut).

[0039] Figure 10 is Figure 1 Cross-sectional view in the C-C direction (the cut is the second special-shaped cut).

[0040] Figure 11 is Figure 2 Cross-sectional view in the C-C direction (the cut is the second special-shaped cut).

[0041] Figure 12 is Figure 1 、 Figure 2 Side structure diagram of the T-shaped steel in (the cut is the second special-shaped cut).

[0042] Figure 13 is Figure 1 Cross-sectional view in the D-D direction.

[0043] Figure 14 is Figure 2 Cross-sectional view in the D-D direction.

[0044] Figure 15 Structural schematic diagram of the inverted T-shaped steel-UHPC composite slab with transverse steel strips on the bottom surface of the UHPC slab provided by an embodiment of the present invention (studs are arranged under the thickened section of the steel strips).

[0045] Figure 16 Structural schematic diagram of the inverted T-shaped steel-UHPC composite slab with a whole steel plate on the bottom surface of the UHPC slab provided by an embodiment of the present invention (studs are arranged under the thickened section of the steel plate).

[0046] Figure 17 is Figure 15 Cross-sectional view in the A-A direction.

[0047] Figure 18 is Figure 16 Cross-sectional view in the A-A direction.

[0048] Figure 19 is Figure 15 Cross-sectional view in the B-B direction.

[0049] Figure 20 is Figure 16 Cross-sectional view in the B-B direction.

[0050] Figure 21 is Figure 15 a sectional view taken along the C-C direction in

[0051] Figure 22 is Figure 16 a sectional view taken along the C-C direction in

[0052] Figure 23 is Figure 15 a sectional view taken along the D-D direction in

[0053] Figure 24 is Figure 16 a sectional view taken along the D-D direction in

[0054] Figure 25 is a schematic diagram of non-destructive cutting of an inverted T-shaped steel using an H-shaped steel provided by an embodiment of the present invention (the cut is the third special-shaped cut).

[0055] Among them, the reference numerals are: 1-inverted T-shaped steel, 101-web, 102-first convex part, 103-second convex part, 104-first special-shaped cut, 105-second special-shaped cut, 106-third convex part, 107-fourth convex part, 108-fifth convex, 109-third special-shaped cut; 2-UHPC board; 3-steel strip; 4-steel plate; 5-through hole; 6-shear connector; 7-steel bar mesh, 701-transverse steel bar, 702-longitudinal steel bar; 8-thickened part; 9-pavement layer; 10-second shear connector. Specific Embodiments

[0056] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly located on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientations or positions indicated by the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positions shown in the drawings, and are only for the convenience of description and cannot be construed as limitations on the technical solution of the present invention. The terms "first" and "second" are only used for the purpose of convenient description and cannot be construed as indicating or implying relative importance or implicitly specifying the number of technical features. The meaning of "a plurality" is two or more, and the meaning of "several" is any number including one, unless otherwise specifically defined.

[0058] Embodiment 1

[0059] Please refer to the attached Figure 1 、 4 -5, 7, 9 - 10, 12 - 13, 15, 17, 19, 21, 23. The purpose of this embodiment is to provide an inverted T-shaped steel - UHPC composite slab, including: a UHPC slab 2 and multiple inverted T-shaped steels 1 arranged at intervals along the longitudinal bridge direction. The UHPC slab 2 is arranged on the multiple inverted T-shaped steels 1 arranged at intervals along the longitudinal bridge direction; a steel plate member is provided between the bottom of the UHPC slab 2 and the upper part of the web 101 of the inverted T-shaped steel. The upper surface of the steel plate member is fixedly connected to the UHPC slab 2, and the lower surface of the steel plate member is connected to the web 101. This connection only refers to resting on the web 101 or being temporarily fixed. In this inverted T-shaped steel - UHPC composite slab, the upper flange plate of the H-shaped steel is cancelled, and the inverted T-shaped steel 1 is used, reducing the weight of the longitudinal ribs of the UHPC composite slab by more than 1 / 3, so that the self-weight of the inverted T-shaped steel - UHPC system is lighter, and thus it can be applied to long-span bridges such as suspension bridges that are highly sensitive to self-weight. The inverted T-shaped steel 1 is a finished T-shaped steel or is formed by cutting an H-shaped steel in half. The cutting method of the H-shaped steel can be non-loss cutting without generating scrap. In an alternative embodiment, a special-shaped notch and a protrusion are formed at the top of the web 101 of the inverted T-shaped steel. Both the special-shaped notch and the protrusion can be used to connect to the UHPC slab 2 or the steel plate member; in a preferred embodiment, the bottom plane of the special-shaped notch is connected to a steel strip 3 or a steel plate 4, and the top plane of the protrusion is connected to the UHPC slab 2.

[0060] In this embodiment, the steel plate member is a steel plate strip 3, and multiple steel plate strips 3 are arranged along the transverse direction of the bridge. At the top of the web 101 of the inverted T-shaped steel 1, a first special-shaped notch 104 is formed, and adjacent first special-shaped notches 104 are mirror images of each other. On both sides of each first special-shaped notch 104, a first protrusion 102 and a second protrusion 103 are respectively formed. The upper surfaces of the first protrusion 102, the first special-shaped notch 104, and the steel plate strip 3 are connected to the UHPC plate 2, and the upper surface of the second protrusion 103 is connected to the lower surface of the steel plate strip 3. The height of the first protrusion 102 is greater than the height of the second protrusion 103. Alternatively, at the top of the web 101 of the inverted T-shaped steel 1, a second special-shaped notch 105 is formed, and adjacent second special-shaped notches 105 are mirror images of each other. On both sides of each second special-shaped notch 105, a third protrusion 106 and a fourth protrusion 107 are respectively formed. The upper surfaces of the second protrusion 106, the second special-shaped notch 106, and the steel plate strip 3 are connected to the UHPC plate 2, and the upper surface of the fourth protrusion 107 is connected to the lower surface of the steel plate strip 3. The height of the third protrusion 106 is greater than the height of the fourth protrusion 107. The upper part of the web 101 of the T-shaped steel 1 is cut to form a first protrusion part 102 (third protrusion 106), a second protrusion part 103 (fourth protrusion 107), and a special-shaped notch. The first protrusion part 102 (third protrusion 106) is used for anchoring. The two special-shaped notches and the UHPC plate 2 form a mortise and tenon to transfer the horizontal shear force. The steel plate strip 3 is placed on the second protrusion part 103 (fourth protrusion 107), which can simultaneously share the horizontal and vertical shear forces between the UHPC plate and the web 101 of the inverted T-shaped steel 1, and improve the mechanical properties of the structure. Preferably, the first special-shaped notch 104 is trapezoidal, and the second special-shaped notch 106 is arc-shaped.

[0061] Furthermore, the connection part between the UHPC plate 2 and the web 101 is thickened to form a thickened part 8; a plurality of first shear connectors 10 are arranged on the lower surface of the steel plate strip 3, and the plurality of first shear connectors 10 are connected to the thickened part 8. The web 101 of the inverted T-shaped steel 1 is inserted into the UHPC plate 2. The connection part between the UHPC plate 2 and the web 101 is thickened to form a thickened part 8, which can ensure reliable shear force transmission and the required insertion depth, and can also ensure that the layout of transverse steel bars is not affected; studs are welded below the steel plate strip 3 and connected to the thickened part 8 of the lower UHPC to ensure the mechanical properties of the thickened part of the UHPC plate. The thickness of the overall flat plate of the UHPC plate 2 is 30 mm to 140 mm. Since the web 101 of the inverted T-shaped steel 1 needs to be inserted into the UHPC plate 2, in order to ensure reliable shear force transmission, a certain insertion depth is required. However, the UHPC plate 2 is relatively thin. Too much insertion depth will affect the layout of transverse steel bars. At the same time, if the UHPC plate 2 above the web 101 of the inverted T-shaped steel 1 is too thin, shear failure is likely to occur. Therefore, the thickened part 8 is added.

[0062] In addition, the upper surface of the steel strip 3 is provided with a plurality of second shear connectors 6 for connecting with the UHPC board 2. A single layer of steel mesh 7 is pre-embedded in the UHPC board 2, and the steel mesh 7 is formed by transverse steel bars 701 and longitudinal steel bars 702 laid alternately.

[0063] Embodiment 2

[0064] Please see attached Figure 2-4 , 6, 8-9, 11-12, 14, 16, 18, 20, 22, 24, the purpose of this embodiment is to provide an inverted T-steel-UHPC composite plate, comprising: a UHPC plate 2 and a plurality of inverted T-steels 1 spaced apart along the longitudinal bridge direction, the UHPC plate 2 being arranged on the plurality of inverted T-steels 1 spaced apart along the longitudinal bridge direction; a steel plate member being arranged between the bottom of the UHPC plate 2 and the upper portion of the web 101 of the inverted T-steel; the upper surface of the steel plate member being fixedly connected to the UHPC plate 2, and the lower surface of the steel plate member being connected to the web 101. The upper flange plate of the H-steel is eliminated in the inverted T-steel-UHPC composite plate, and the inverted T-steel 1 is used, so that the weight of the longitudinal ribs of the UHPC composite plate is reduced by more than 1 / 3, thereby making the self-weight of the inverted T-steel-UHPC system lighter, and thus being applicable to large-span bridges that are highly sensitive to self-weight, such as suspension bridges. The inverted T-shaped steel 1 is formed by cutting a finished T-shaped steel or by cutting an H-shaped steel into two. The cutting method of the H-shaped steel is lossless cutting, and no scraps are generated.

[0065] In this embodiment, the steel plate member is a whole steel plate 4, and multiple groups of through holes 5 are arranged on the steel plate 4. Each group of through holes 5 is arranged along the transverse bridge direction. A first special-shaped notch 104 is formed at the top of the web 101 of the inverted T-shaped steel 1. Adjacent first special-shaped notches 104 are mirror images of each other. A first protrusion 102 and a second protrusion 103 are respectively formed on both sides of each first special-shaped notch 104. The upper surface of the first protrusion 102, the first special-shaped notch 104, and the upper surface of the steel plate 4 are connected to the UHPC plate 2. The upper surface of the second protrusion 103 is connected to the lower surface of the steel plate 4. The height of the first protrusion 102 is greater than the height of the second protrusion 103. Among them, the first protrusion 102 passes through the through hole 5. Or, a second special-shaped notch 105 is formed at the top of the web 101 of the inverted T-shaped steel 1. Adjacent second special-shaped notches 105 are mirror images of each other. A third protrusion 106 and a fourth protrusion 107 are respectively formed on both sides of each second special-shaped notch 105. The upper surface of the second protrusion 106, the second special-shaped notch 106, and the upper surface of the steel plate 4 are connected to the UHPC plate 2. The upper surface of the fourth protrusion 107 is connected to the lower surface of the steel plate 4. The height of the third protrusion 106 is greater than the height of the fourth protrusion 107. Among them, the first protrusion 102 passes through the through hole 5. The upper part of the web 101 of the T-shaped steel 1 is cut to form a first protrusion part 102 (third protrusion 106), a second protrusion part 103 (fourth protrusion 107), and a special-shaped notch. The first protrusion part 102 (third protrusion 106) is used for anchoring. The two special-shaped notches and the UHPC plate 2 form a mortise and tenon joint to transfer the horizontal shear force. The whole steel plate 4 is laid on the second protrusion part 103 (fourth protrusion 107), which can share the horizontal shear force and vertical shear force between the UHPC plate 2 and the web 101 of the inverted T-shaped steel 1 at the same time, and improve the mechanical performance of the structure. Preferably, the first special-shaped notch 104 is trapezoidal, and the second special-shaped notch 106 is arc-shaped. The through hole 5 is preferably an oval hole or a square hole. The existence of the above through hole 5 can facilitate the first protrusion part 102 (third protrusion 106) on the web 101 to pass through the steel plate 4 and be fixedly connected to the UHPC plate 2. The through hole 5 cannot be too large and should not be greater than the width of the thickened part 8 at the connection between the UHPC plate 2 and the web 101. The through hole 5 cannot be too small to facilitate the passage of the first protrusion part 102 (third protrusion 106), and at the same time, it can meet the requirement that UHPC can easily flow into the thickened section 8 below the steel plate 4 when prefabricating the bridge deck.

[0066] Furthermore, the connection between the UHPC plate 2 and the web 101 is thickened to form a thickened portion 8; a plurality of first shear connectors 10 are provided on the lower surface of the steel plate 4, and the plurality of first shear connectors 10 are connected to the thickened portion 8. The web 101 of the inverted T-shaped steel 1 is inserted into the UHPC plate 2, and the UHPC plate 2 is thickened at the connection with the web 101 to form a thickened portion 8, which can ensure reliable shear force transmission and the required insertion depth, and can also ensure that the layout of the transverse steel bars is not affected; a bolt connected to the lower UHPC thickened portion 8 is welded below the steel plate 4 to ensure the force performance of the thickened section of the UHPC plate 2. The thickness of the overall flat plate of the UHPC plate 2 is 30 mm to 140 mm. Since the web 101 of the inverted T-shaped steel 1 needs to be inserted into the UHPC plate 2, in order to ensure the reliable transmission of shear force, it needs to be inserted to a certain depth. However, the UHPC plate is relatively thin, and too much insertion depth will affect the layout of the transverse reinforcement. At the same time, if the UHPC plate 2 above the web 101 of the inverted T-shaped steel 1 is relatively thin, shear failure is likely to occur, so a thickening portion 8 is additionally provided.

[0067] In addition, the upper surface of the whole steel plate 4 is provided with a plurality of second shear connectors 6 for connecting with the UHPC plate 2. A single layer of steel mesh 7 is pre-embedded in the UHPC plate 2, and the steel mesh 7 is formed by transverse steel bars 701 and longitudinal steel bars 702 laid alternately.

[0068] Finally, in an optional embodiment, as shown in the attached Figure 25 As shown, the H-shaped steel is cut into two parts and directly cut to form two webs 101 with the fifth protrusion 108 and the third special-shaped cut 109. This cutting method does not produce scraps compared to the cutting of the first special-shaped cut 104 and the second special-shaped cut 105. When in use, the steel strip 3 or the whole steel plate 4 with the through hole 5 is placed on the bottom plane of the third special-shaped cut 109, and the fifth protrusion 108 (the fifth protrusion 108 passes through the through hole 5 when the steel plate 4 is used) is connected to the UHPC plate 2. The connection between the UHPC plate 2 and the web 101 is thickened to form a thickened portion 8, and the lower surface of the steel strip 3 or the whole steel plate 4 with the through hole 5 is welded with a first shear connector 10 connected to the thickened portion 8.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reversed T-shaped steel - UHPC composite slab, characterized in that, Including: A UHPC slab (2) and a plurality of inverted T-shaped steel bars (1) arranged at intervals along the longitudinal direction of the bridge. The UHPC slab (2) is disposed on the plurality of inverted T-shaped steel bars (1) arranged at intervals along the longitudinal direction of the bridge. A steel plate member is provided between the bottom of the UHPC slab (2) and the upper part of the web (101) of the inverted T-shaped steel bar. The upper surface of the steel plate member is fixedly connected to the UHPC slab (2), and the lower surface of the steel plate member is connected to the web (101).

2. The inverted T-shaped steel-UHPC composite slab according to claim 1, characterized in that, The steel plate member is a steel plate strip (3), and a plurality of the steel plate strips (3) are arranged along the transverse direction of the bridge.

3. The inverted T-shaped steel-UHPC composite slab according to claim 1, wherein The steel plate member is a whole steel plate (4), and a plurality of groups of through holes (5) are provided on the steel plate (4). Each group of the through holes (5) is arranged along the transverse direction of the bridge.

4. The inverted T-shaped steel-UHPC composite slab according to claim 2, characterized in that, A first special-shaped cut (104) is formed at the top of the web (101) of the inverted T-shaped steel bar (1). Adjacent first special-shaped cuts (104) are mirror images of each other. A first protrusion (102) and a second protrusion (103) are respectively formed on both sides of each first special-shaped cut (104). The first protrusion (102), the first special-shaped cut (104), and the upper surface of the steel plate strip (3) are connected to the UHPC slab (2). The upper surface of the second protrusion (103) is connected to the lower surface of the steel plate strip (3). The height of the first protrusion (102) is greater than the height of the second protrusion (103); or, A second special-shaped cut (105) is formed at the top of the web (101) of the inverted T-shaped steel bar (1). Adjacent second special-shaped cuts (105) are mirror images of each other. A third protrusion (106) and a fourth protrusion (107) are respectively formed on both sides of each second special-shaped cut (105). The second protrusion (106), the second special-shaped cut (106), and the upper surface of the steel plate strip (3) are connected to the UHPC slab (2). The upper surface of the fourth protrusion (107) is connected to the lower surface of the steel plate strip (3). The height of the third protrusion (106) is greater than the height of the fourth protrusion (107).

5. The inverted T-shaped steel-UHPC composite slab according to claim 3, wherein A first special-shaped cut (104) is formed at the top of the web (101) of the inverted T-shaped steel bar (1). Adjacent first special-shaped cuts (104) are mirror images of each other. A first protrusion (102) and a second protrusion (103) are respectively formed on both sides of each first special-shaped cut (104). The first protrusion (102), the first special-shaped cut (104), and the upper surface of the steel plate (4) are connected to the UHPC slab (2). The upper surface of the second protrusion (103) is connected to the lower surface of the steel plate (4). The height of the first protrusion (102) is greater than the height of the second protrusion (103), wherein the first protrusion (102) passes through the through hole (5); or, A second special-shaped cut (105) is formed at the top of the web (101) of the inverted T-shaped steel bar (1). Adjacent second special-shaped cuts (105) are mirror images of each other. On both sides of each second special-shaped notch (105), a third protrusion (106) and a fourth protrusion (107) are respectively formed. The second protrusion (106), the second special-shaped notch (106), the upper surface of the steel plate (4) are connected to the UHPC plate (2). The upper surface of the fourth protrusion (107) is connected to the lower surface of the steel plate (4). The height of the third protrusion (106) is greater than the height of the fourth protrusion (107). Among them, the first protrusion (102) passes through the through hole (5).

6. The inverted T-shaped steel-UHPC composite slab according to claim 4 or 5, characterized in that The first special-shaped notch (104) is trapezoidal, and the second special-shaped notch (106) is arc-shaped.

7. The inverted T-shaped steel-UHPC composite slab according to claim 1, characterized in that, The connection part between the UHPC plate (2) and the web (101) is thickened to form a thickened part (8); A plurality of first shear connectors (10) are arranged on the lower surface of the steel plate member, and the plurality of first shear connectors (10) are connected to the thickened part (8).

8. The inverted T-shaped steel-UHPC composite slab according to claim 1, wherein A plurality of second shear connectors (6) for connecting with the UHPC plate (2) are arranged on the upper surface of the steel plate member.

9. The inverted T-shaped steel-UHPC composite slab according to claim 1, characterized in that, The inverted T-shaped steel (2) is formed by cutting a finished T-shaped steel or an H-shaped steel in half.

10. The inverted T-shaped steel-UHPC composite slab according to claim 1, wherein A single-layer steel bar mesh (7) is embedded in the UHPC plate (2), and the steel bar mesh (7) is formed by staggered laying of transverse steel bars (701) and longitudinal steel bars (702).

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