A composite beam structure of UHPC honeycomb prefabricated panel-steel box beam and construction method

Abstract

The present application relates to a composite beam structure and construction method of a UHPC honeycomb prefabricated plate-steel box beam, and relates to the technical field of bridge structures. The composite beam structure includes a UHPC honeycomb prefabricated plate and a steel box beam. The UHPC honeycomb prefabricated plate is set as a honeycomb sandwich structure, which includes an upper skin plate, a honeycomb core material, a lower skin plate, and two side skin plates tightly connected to the left and right sides of the honeycomb core material from top to bottom, and the lower surface of the lower skin plate is fixedly connected to the steel box beam. The present application makes full use of the high-strength characteristics of UHPC materials, the light weight, compression resistance, and bending resistance of the honeycomb sandwich structure, and the shear resistance of the steel box beam components, which can not only solve the problem of easy cracking of the bridge deck, but also reduce the deadweight of the bridge structure; in addition, the UHPC honeycomb prefabricated plate and the steel box beam are prefabricated as a whole in the factory, and then transported to the site for segment assembly, which can improve efficiency and shorten the construction period. Therefore, the present application can not only reduce the deadweight of the bridge structure and reduce costs, but also improve construction efficiency and shorten the construction period.

Description

Technical Field

[0001] The present application relates to the technical field of bridge structures, and in particular to a composite beam structure of a UHPC honeycomb prefabricated panel-steel box beam and a construction method. Background Art

[0002] Conventional composite beam structures are usually composed of solid ordinary concrete bridge decks and steel box beam components. However, due to the low tensile strength of concrete materials and obvious shrinkage and creep effects, concrete bridge decks are prone to cracking under external loads and restraint loads.

[0003] In the related art, measures such as increasing the thickness of the bridge deck and configuring prestressed tendons are usually taken to solve the cracking problem of the concrete bridge deck. However, the method of increasing the thickness of the bridge deck will not only cause the main beam to have a larger deadweight, but also because it is generally a solid plate, it will further increase the deadweight of the bridge section. The design of the structural dimensions needs to be increased accordingly, resulting in a large amount of consumables and high costs, and it cannot fundamentally solve the cracking problem of the concrete bridge deck. Summary of the invention

[0004] The embodiment of the present application provides a composite beam structure of UHPC honeycomb prefabricated panels and steel box beams and a construction method to solve the problems in the related art of increasing the thickness of the bridge deck to solve the problem of easy cracking of the bridge deck, resulting in an increase in the self-weight of the bridge, and there are problems of large consumption of consumables and high construction costs.

[0005] In a first aspect, a composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam is provided, comprising a steel box beam and a UHPC honeycomb prefabricated panel, wherein the UHPC honeycomb prefabricated panel is located above the steel box beam, and the UHPC honeycomb prefabricated panel is configured as a honeycomb sandwich structure, wherein the honeycomb sandwich structure comprises, from top to bottom, an upper skin panel, a honeycomb core material, a lower skin panel, and two side skin panels tightly connected to the left and right side surfaces of the honeycomb core material, respectively, wherein the lower surface of the lower skin panel is fixedly connected to the steel box beam, and the upper skin panel, the honeycomb core material, the lower skin panel, and the side skin panels are all UHPC concrete.

[0006] In some embodiments, the bottom surface of the honeycomb core material is configured as a tooth-jointed structure.

[0007] The concave surface of the tooth joint structure is provided with a first shear-resistant connector, and the first shear-resistant connector and the convex surface of the tooth joint structure are both embedded in the lower skin panel.

[0008] The upper skin plate on each cell of the honeycomb core material is provided with a health-preserving hole.

[0009] Each of the outermost cells at the front and rear sides of the honeycomb core material is provided with a partition plate.

[0010] A longitudinal wet joint is provided between the UHPC honeycomb prefabricated panel and the steel box girder.

[0011] There are multiple composite beam structures, and transverse wet joints are arranged between adjacent composite beam structures.

[0012] A second shear connector is provided on the upper flange steel plate of the steel box girder, and the steel box girder is connected to the lower surface of the lower skin plate via the second shear connector.

[0013] In a second aspect, a construction method of a composite beam structure of a UHPC honeycomb prefabricated panel-steel box beam is provided, comprising the following steps:

[0014] Prefabricate steel box girders and transport the steel box girders to a UHPC concrete beam yard;

[0015] Prefabricate honeycomb sandwich components including upper skin panels, honeycomb core materials and side skin panels;

[0016] A template is arranged on the steel box girder, a lower skin plate is cast on the template, and the honeycomb sandwich component is fixedly connected to the lower skin plate to form a UHPC honeycomb prefabricated panel;

[0017] A longitudinal wet joint is provided between the UHPC honeycomb prefabricated panel and the steel box girder, and UHPC concrete is poured into the longitudinal wet joint. After the UHPC concrete solidifies, the formwork is removed.

[0018] In some embodiments, the construction method further includes the following steps: there are multiple composite beam structures, transverse wet joints are provided between adjacent composite beam structures, and UHPC concrete is poured into the transverse wet joints.

[0019] The beneficial effects brought about by the technical solution provided in this application include: not only can the deadweight of the bridge structure be reduced and the cost be lowered, but also the compression and bending resistance of the structure can be ensured; at the same time, the use of a prefabricated composite beam structure for overall hoisting construction can improve construction efficiency and shorten construction period.

[0020] The embodiment of the present application provides a composite beam structure of UHPC honeycomb prefabricated panel-steel box beam and a construction method, including UHPC honeycomb prefabricated panel and steel box beam, wherein the UHPC honeycomb prefabricated panel is set as a honeycomb sandwich structure, which includes, from top to bottom, an upper skin panel, a honeycomb core material, a lower skin panel and two side skin panels tightly connected to the left and right sides of the honeycomb core material respectively, the lower surface of the lower skin panel is fixedly connected to the steel box beam, and the upper skin panel, the honeycomb core material, the lower skin panel and the side skin panel are all made of UHPC concrete, which has ultra-high durability and ultra-high mechanical properties; since the honeycomb sandwich structure has good compressive and bending properties and It is light in weight and can make full use of the strength of the material. Combining the high-strength characteristics of UHPC materials, the light weight, compression and bending resistance of the honeycomb sandwich structure and the shear resistance of the steel box girder components, it can not only solve the problem of easy cracking of the bridge deck, but also reduce the deadweight of the bridge structure, reduce the amount of consumables and reduce costs; in addition, the UHPC honeycomb prefabricated panels and steel box girders are prefabricated as a whole in the factory and then transported to the site for segmental assembly, which can improve efficiency and shorten the construction period. Therefore, this application can not only reduce the deadweight of the bridge structure and reduce costs, but also ensure the compression and bending resistance of the structure, and can improve construction efficiency and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A structural schematic diagram of a composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam provided in an embodiment of the present application;

[0023] Figure 2 Provided for the embodiments of this application Figure 1 The main view;

[0024] Figure 3 Provided for the embodiments of this application Figure 2 Schematic diagram of the local structure;

[0025] Figure 4 A schematic diagram of the structure of a UHPC honeycomb prefabricated panel provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the inverted structure of a UHPC honeycomb prefabricated panel provided in an embodiment of the present application;

[0027] Figure 6 Provided for the embodiments of this application Figure 5 Schematic diagram of the local structure;

[0028] Figure 7 A schematic diagram of the structure of the segment assembly provided in the embodiment of the present application;

[0029] Figure 8 Provided for the embodiments of this application Figure 7 A cross-sectional view of

[0030] Fig. 9 A schematic flow chart of a construction method for a composite beam structure of a UHPC honeycomb prefabricated panel-steel box beam provided in an embodiment of the present application.

[0031] In the figure: 1-UHPC honeycomb prefabricated panel, 11-upper skin panel, 111-curing holes, 12-honeycomb core material, 121-tooth joint structure, 13-lower skin panel, 14-side skin panel, 2-steel box girder, 21-upper flange steel plate, 3-first shear connector, 4-partition, 5-longitudinal wet joint, 6-transverse wet joint, 7-second shear connector. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The embodiment of the present application provides a composite beam structure of UHPC honeycomb prefabricated panels and steel box beams and a construction method, which can solve the problems in the related art of increasing the thickness of the bridge deck to solve the problem of easy cracking of the bridge deck, resulting in an increase in the self-weight of the bridge, and the presence of large amounts of consumables and high construction costs.

[0034] See also Figure 1 to Figure 5 As shown, an embodiment of the present application provides a composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam, which includes a UHPC honeycomb prefabricated panel 1 and a steel box beam 2. The UHPC honeycomb prefabricated panel 1 is located above the steel box beam 2. The UHPC honeycomb prefabricated panel 1 is configured as a honeycomb sandwich structure. The honeycomb sandwich structure includes an upper skin panel 11, a honeycomb core material 12 and a lower skin panel 13 from top to bottom. The honeycomb sandwich structure also includes two side skin panels 14 that are tightly connected to the left and right sides of the honeycomb core material 12, respectively. The upper skin panel 11, the honeycomb core material 12 and the side skin panels 14 are prefabricated as a whole, prefabricated in advance by a mold and formed at one time; the lower surface of the lower skin panel 13 is fixedly connected to the steel box beam 2, thereby forming an assembled composite beam structure. Preferably, see Figure 3As shown, a second shear connector 7 is embedded in the upper flange steel plate 21 of the steel box girder 2, and the second shear connector 7 is preferably a shear nail. The steel box girder 2 is connected to the lower surface of the lower skin plate 13 through the second shear connector 7. Since the honeycomb sandwich structure has good compressive and bending resistance and is light in weight, the strength of the material can be fully utilized. Therefore, the honeycomb sandwich structure is used to prepare a composite beam structure to replace the solid concrete plate in the prior art, which can reduce the self-weight of the composite beam structure while ensuring its bending and compressive resistance. In addition, the upper skin plate 11, the honeycomb core material 12, the lower skin plate 13 and the side skin plate 14 are all made of UHPC concrete, and UHPC (Ultra-High Performance Concrete) is an ultra-high performance concrete with ultra-high durability and ultra-high mechanical properties. It can provide strong compressive and bending resistance, and its excellent tensile and crack resistance can effectively solve the problem of bridge deck cracking in the negative moment area.

[0035] Specifically, when the bridge deck width is 13m, the segment beam height is 4m, and the steel box beam 2 is 3.85m high, the height of the UHPC honeycomb prefabricated panel 1 can be set to 0.15m: the thickness of the upper skin plate 11 is 0.04m, the side length of each nest in the honeycomb core material 12 is 0.10m, the thickness is 0.01m, and the height is 0.1m, while the side skin plate 14 is set to unequal thickness, the lower skin plate 13 is 0.03m thick, and the outermost irregular nests are filled. Among them, the porosity of the honeycomb core material 12 is 88.79%, and the whole cross-section can save 59.19% of concrete. The honeycomb sandwich structure not only ensures the compressive and bending resistance of the bridge deck; the high-strength mechanical properties of UHPC high-performance concrete can provide strong compressive and bending resistance, and its excellent tensile and crack resistance can effectively solve the problem of bridge deck cracking in the negative bending moment area. The combination of the two greatly reduces the weight of the bridge deck, saves energy and is environmentally friendly, with good economic benefits.

[0036] Preferably, see Figure 6 As shown, the bottom surface of the honeycomb core material 12 is set as a tooth joint structure 121, and a first shear-resistant connector 3 is pre-embedded in the concave surface of the tooth joint structure 121, and the convex surfaces of the first shear-resistant connector 3 and the tooth joint structure 121 are embedded in the upper surface of the lower skin plate 13 and condensed into a whole together; the tooth joint structure 121 and the first shear-resistant connector 3 can strengthen the connection between the honeycomb core material 12 and the lower skin plate 13, improve the strength of the UHPC honeycomb prefabricated panel 1, and effectively prevent the honeycomb core material 12 from falling off from the lower skin plate 13.

[0037] Preferably, see Figure 4 As shown, the upper skin plate 11 on each cell of the honeycomb core material 12 is provided with a curing hole 111 , through which water is poured toward the lower skin plate 13 to perform a curing treatment on the lower skin plate 13 , thereby ensuring the strength of the lower skin plate 13 .

[0038] Preferably, see Figure 6 As shown, a partition 4 is provided in each of the front and rear outermost cells of the honeycomb core material 12. The partition 4 is perpendicular to the side skin plate and can be used as a side formwork for the transverse wet joint 6, thereby saving the amount of UHPC concrete at the wet joint.

[0039] Preferably, see Figure 7 and Figure 8 As shown, there are multiple composite beam structures, and transverse wet joints 6 are provided between adjacent composite beam structures; a longitudinal wet joint 5 is provided between the UHPC honeycomb prefabricated panel 1 and the steel box beam 2. The transverse wet joint 6 and the longitudinal wet joint 5 can strengthen the connection between the structures, make up for the small defects of the segment joint surface, have good sealing performance, can effectively prevent water vapor intrusion, and improve the connection stability of the composite beam structure.

[0040] See also Fig. 9 As shown, the present application also provides a construction method of a composite beam structure of a UHPC honeycomb prefabricated panel-steel box beam, comprising the following steps:

[0041] S1: Prefabricate steel box girder 2 and transport the steel box girder 2 to the UHPC concrete beam yard.

[0042] S2: Prefabricate a honeycomb sandwich structure including an upper skin panel 11 , a honeycomb core material 12 and a side skin panel 14 .

[0043] S3: a template is set on the steel box girder 2, and a lower skin plate 13 is cast on the template, and the honeycomb sandwich component is fixedly connected to the lower skin plate 13 to form a UHPC honeycomb prefabricated panel 1.

[0044] S4: a longitudinal wet joint 5 is provided between the UHPC honeycomb prefabricated panel 1 and the steel box girder 2, and UHPC concrete is poured into the longitudinal wet joint 5. After the UHPC concrete solidifies, the formwork is removed.

[0045] Preferably, the construction method further comprises the following steps: there are multiple composite beam structures, transverse wet joints 6 are arranged between adjacent composite beam structures, and UHPC concrete is poured into the transverse wet joints 6 .

[0046] The specific construction method is: see Figures 1 to 8As shown, a plurality of steel box girders 2 are prefabricated and assembled in a factory, and shear nails are pre-embedded in advance on the upper flange steel plate of the steel box girders 2, and the prefabricated steel box girders 2 are transported to the UHPC concrete beam yard; a template is set on the steel box girder 2, and a lower skin plate 13 is cast on the template; a honeycomb sandwich component including an upper skin plate 11, a honeycomb core material 12 and a side skin plate 14 is prefabricated in the UHPC concrete beam yard. When prefabricating the honeycomb sandwich component, a special mold is used for integral prefabrication and one-time molding; and a curing hole 111 is reserved at the upper skin plate 11 at the center of each nest hole by using a mold; and the bottom surface of the honeycomb core material 12 is made of a mold The tooth joint structure 121 is provided, and shear nails are embedded in the concave surface of the tooth joint structure 121; before the lower skin plate 13 solidifies, the prefabricated honeycomb sandwich component is accurately placed on the lower skin plate 13 to ensure that the convex surface of the tooth joint structure 121 of the honeycomb core material 12 and the shear nails at the concave surface of the tooth joint structure 121 are completely immersed in the concrete of the newly poured lower skin plate 13, and the upper skin plate 11, the honeycomb core material 12, the lower skin plate 13, and the side skin plate 14 are connected into a whole; a longitudinal wet joint 5 is reserved between the UHPC honeycomb prefabricated panel 1 and the steel box girder 2, and UHPC concrete is poured into the longitudinal wet joint 5 to form a Figure 6 The composite beam structure shown in the figure; the newly cast lower skin plate 13 and the longitudinal wet joint 5 are cured, wherein the upper surface of the lower skin plate 13 is watered and cured through the curing holes 111 reserved in the upper skin plate 11, and the formwork is removed after the UHPC concrete solidifies; then the above-mentioned multiple prefabricated composite beam structures are hoisted and spliced ​​as a whole by a bridge erection machine at the construction site; finally, while setting transverse wet joints 6 between the multiple composite beam structures, a partition 4 is set in each of the outermost nests on the front and rear sides of the honeycomb core material 12, and the partition 4 is perpendicular to the side skin plate and used as a side formwork for the transverse wet joint 6, and UHPC concrete is poured into the transverse wet joint 6. During the pouring process, the outermost half-grid nests at the front and rear ends of the honeycomb core material 12 should be immersed in the UHPC concrete of the newly cast transverse wet joint 6 to solidify into a whole, and cured to equal strength; the above steps are repeated until the entire bridge is erected.

[0047] Specifically, in this embodiment, only part of the honeycomb core material 12 is retained at the longitudinal wet joint 5, and the upper skin plate 11 connected thereto is left vacant, which facilitates the pouring of the longitudinal wet joint 5; the longitudinal wet joint 5 is poured together with the lower skin plate 13, and fills the entire cell hole until it is flush with the top surface of the upper skin plate 11, and the longitudinal wet joint is about 10 cm to 15 cm wide. The pouring order of the lower skin plate 13 is: pouring the lower skin plate 13 in the general area, placing the honeycomb sandwich components, pouring the longitudinal wet joint 5, and equal strength curing.

[0048] Specifically, in the present embodiment, only part of the honeycomb core material 12 is retained at the front and rear ends of the honeycomb core material 12 at the transverse wet joint 6, and the upper skin plate 11 connected thereto is left vacant, which can facilitate the casting of the transverse wet joint 6; the half-cell nest holes at the front and rear ends of the two adjacent honeycomb core materials 12 are solidified into one with the concrete at the newly cast transverse wet joint 6, which can strengthen the connection between the segments, and the transverse wet joint 6 is in the shape of a rectangular strip with a width of about 20 cm to 25 cm; the transverse wet joint 6 is cast together with the lower skin plate 13, and the half-cell nest holes are filled until it is flush with the top surface of the upper skin plate 11.

[0049] Therefore, the present application adopts a UHPC honeycomb prefabricated panel with a honeycomb sandwich structure to replace the solid concrete panel in the prior art, and makes full use of the high-strength characteristics of the material and the lightweight compression and bending resistance of the honeycomb sandwich structure and the shear resistance of the steel structure, which can reduce the dead weight of the bridge structure, reduce the amount of consumables, reduce costs, and save energy and protect the environment; in addition, the bridge section is prefabricated as a whole in the factory and then transported to the site for segment assembly, which can also shorten the construction period and improve efficiency.

[0050] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0051] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0052] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam, comprising a steel box beam (2), characterized in that: Also includes: A UHPC honeycomb prefabricated panel (1), the UHPC honeycomb prefabricated panel (1) is located above the steel box girder (2), the UHPC honeycomb prefabricated panel (1) is set as a honeycomb sandwich structure, the honeycomb sandwich structure comprises, from top to bottom, an upper skin plate (11), a honeycomb core material (12), a lower skin plate (13), and two side skin plates (14) tightly connected to the left and right side surfaces of the honeycomb core material (12), respectively, the lower surface of the lower skin plate (13) is fixedly connected to the steel box girder (2), the upper skin plate (11), the honeycomb core material (12), the lower skin plate (13), and the side skin plates (14) are all UHPC concrete, the upper skin plate (11) on each cell of the honeycomb core material (12) is provided with a curing hole (111), and each of the front and rear outermost cells on the honeycomb core material (12) is provided with a partition plate (4).

2. A composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam as claimed in claim 1, characterized in that: The bottom surface of the honeycomb core material (12) is configured as a tooth-jointed structure (121).

3. A composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam as claimed in claim 2, characterized in that: The concave surface of the tooth-joint structure (121) is provided with a first shear-resistant connector (3), and the convex surfaces of the first shear-resistant connector (3) and the tooth-joint structure (121) are both embedded in the lower skin plate (13).

4. A composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam as claimed in claim 1, characterized in that: A longitudinal wet joint (5) is provided between the UHPC honeycomb prefabricated panel (1) and the steel box beam (2).

5. The composite beam structure of UHPC honeycomb prefabricated panel and steel box beam according to claim 1, characterized in that: There are a plurality of composite beam structures, and transverse wet joints (6) are provided between adjacent composite beam structures.

6. The composite beam structure of UHPC honeycomb prefabricated panel and steel box beam according to claim 1, characterized in that: A second shear-resistant connector (7) is provided on the upper flange steel plate (21) of the steel box girder (2), and the steel box girder (2) is connected to the lower surface of the lower skin plate (13) via the second shear-resistant connector (7).

7. A construction method of a composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam as claimed in claim 1, characterized in that: The following steps are involved: Prefabricate the steel box girder (2), and transport the steel box girder (2) to the UHPC concrete beam yard; Prefabricate a honeycomb sandwich component including an upper skin panel (11), a honeycomb core material (12) and a side skin panel (14); A template is arranged on the steel box girder (2), a lower skin plate (13) is cast on the template, and the honeycomb sandwich component is fixedly connected to the lower skin plate (13) to form a UHPC honeycomb prefabricated panel (1); A longitudinal wet joint (5) is provided between the UHPC honeycomb prefabricated panel (1) and the steel box girder (2), and UHPC concrete is poured onto the longitudinal wet joint (5). After the UHPC concrete solidifies, the formwork is removed.

8. The construction method of a composite beam structure of a UHPC honeycomb prefabricated panel and a steel box beam as claimed in claim 7, characterized in that: The construction method further comprises the following steps: there are a plurality of composite beam structures, transverse wet joints (6) are provided between adjacent composite beam structures, and UHPC concrete is poured into the transverse wet joints (6).

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