Hollow slab girder structure and bridge structure

Abstract

The utility model relates to the technical field of bridges, in particular to a hollow slab girder structure and a bridge structure. According to the hollow slab beam structure, all middle sections are sequentially and continuously arranged between two end sections in the length direction of the end sections, all the middle sections and all the end sections are connected to form a whole, and prestressed steel bundles penetrate through corresponding cavities of all the middle sections and corresponding prestressed steel bundle preformed holes of the two end sections; the two ends of the prestressed steel beam are correspondingly anchored to the two end sections, so that the hollow slab girder structure meets the stress capacity, the upper portion of the middle section is continuous in the transverse direction, hinge joint components do not need to be arranged, and the problem that the hinge joint components are prone to damage in the using process is solved. According to the hollow slab bridge structure, a hinge joint is omitted in the hollow slab bridge structure, the problem that a hinge joint component is prone to damage in the using process is solved, and the bridge is safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge technical field, especially hollow slab beam structure and bridge structure. BACKGROUND

[0002] The prefabricated hollow slab bridge is one of the most commonly used bridge types for small and medium span bridges, and the main component is a prefabricated concrete hollow slab, which is connected transversely by hinge joint concrete to form a whole. The prefabricated hollow slab bridge has the advantages of light weight, simple structure, low cost, standardization of centralized prefabrication, convenient construction and low building height, and the disadvantage is that the hinge joint component is the weak part of the whole prefabricated hollow slab bridge. After a period of operation, the hinge joint components of most hollow slab bridges are damaged to varying degrees, such as longitudinal through cracks in the hollow slab along the hinge joint, and the hinge joint concrete is partially stripped, which further causes damage, cracking and water seepage of the bridge deck pavement, etc. hazards, endangering the safety of the bridge and becoming a hidden danger for highway operation.

[0003] The existing technology optimization means is generally to optimize the shape of the hinge joint and improve the transverse connection method, but it is inevitable to bind the steel bars in the narrow hinge joint and pour the concrete, and it also needs to be vibrated and compacted and maintained. The construction quality of the hinge joint is difficult to guarantee. At the same time, engineering practice also shows that the existing technology optimization means has not solved the problem of hinge joint damage. And the superstructure of the prefabricated hollow slab bridge is composed of prefabricated hollow slab components and hinge joint components. Only the prefabricated hollow slab components can be truly standardized and centrally prefabricated. The hinge joint components include hinge joint steel bars and hinge joint concrete, and the hinge joint steel bars need to be bound on site, and the hinge joint concrete needs to be cast in place. Therefore, the superstructure of the prefabricated hollow slab bridge has not realized full component assembly in a strict sense. And whether it is a prefabricated hollow slab component or a hinge joint component, it is composed of concrete + steel bars. The concrete needs to be erected and removed, and the steel bars need to be manually bound. The labor cost of these two items is relatively high.

[0004] In summary, there are five technical problems of the existing prefabricated hollow slab bridge:

[0005] 1. The hinge joint component of the existing prefabricated hollow slab bridge is prone to damage during use;

[0006] 2. The superstructure of the existing prefabricated hollow slab bridge has not realized component full assembly;

[0007] 3. The superstructure of the existing prefabricated hollow slab bridge needs to bind steel bars, resulting in high labor cost and long construction period;

[0008] 4. The concrete pouring of the superstructure of the existing prefabricated hollow slab bridge needs to erect and remove the formwork, resulting in high labor cost and long construction period;

[0009] 5. In the process of pouring concrete for the upper structure of the existing assembled hollow slab bridge, the concrete loss is large due to the blockage of the formwork. Content of the utility model

[0010] The utility model discloses a hollow slab beam structure and bridge structure.

[0011] In a first aspect, the utility model provides a kind of hollow slab beam structure, comprising

[0012] Two end segments, the end segment is provided with prestressed steel bundle reservation hole, the prestressed steel bundle reservation hole is axially arranged along the longitudinal direction of the end segment;

[0013] A plurality of middle segments, all the middle segments are sequentially and continuously arranged between two end segments along the length direction of the end segment, all the middle segments and all the end segments are connected to form a whole, the middle segment is provided with cavity corresponding to the prestressed steel bundle reservation hole, the cavity is longitudinally through in the middle segment, and the upper part of the middle segment is continuous in transverse direction.

[0014] A plurality of prestressed steel bundles, the prestressed steel bundle is arranged in the corresponding cavity of all the middle segments and the corresponding prestressed steel bundle reservation hole of two end segments, and the two ends of the prestressed steel bundle are anchored in two end segments.

[0015] The hollow slab beam structure described in the scheme, all the middle segments are sequentially and continuously arranged between two end segments along the length direction of the end segment, all the middle segments and all the end segments are connected to form a whole, and the prestressed steel bundle is arranged in the corresponding cavity of all the middle segments and the corresponding prestressed steel bundle reservation hole of two end segments, and the two ends of the prestressed steel bundle are anchored in two end segments, so that the hollow slab beam structure meets the stress capacity, and the upper part of the middle segment is continuous in transverse direction, so that the hinge joint component does not need to be arranged, and the problem that the hinge joint component is prone to diseases in use is avoided.

[0016] Preferably, the middle segment and the end segment are both prefabricated components, which can realize assembly construction.

[0017] Preferably, the middle segment and the end segment are both 3D printed structures, which are simpler to prefabricate, do not need to erect and remove formwork, reduce labor cost and save construction period.

[0018] Preferably, the linear shape of the cross section of the middle section is a closed loop, the closed loop comprises a loop segment which is continuous in the transverse direction of the middle section, and the cavity is located in the enclosed area of the loop segment and / or between the adjacent enclosed areas of the loop segment.

[0019] The closed loop cross section is adopted, the path of the loop segment is run by the 3D printing nozzle, and the path is connected at the beginning and the end. The prefabrication of the middle section can be completed by running multiple loop segments. The advantage of this design is that the integrity of the middle section is good, the 3D printing work can be continuous, and there is basically no loss in the pouring engineering of the conventional pouring method of concrete.

[0020] Preferably, the closed loop comprises an upper loop segment, a lower loop segment and a bottom segment.

[0021] One end of the upper loop segment on the transverse side of the middle section is connected to one end of the lower loop segment, and the other end is connected to one end of the bottom segment. The two ends of the upper loop segment in the middle part of the middle section are connected to the adjacent ends of the two adjacent lower loop segments.

[0022] The two adjacent upper loop segments are continuous in the transverse direction of the middle section, and the two adjacent lower loop segments are continuous in the transverse direction of the middle section.

[0023] The enclosed area in the upper loop segment forms the cavity, and the cavity is formed between the adjacent lower loop segments and the bottom segment.

[0024] The above design makes the upper part and the lower part of the middle section continuous in the transverse direction, so that the integrity of the middle section is good, and the upper part and the lower part of the middle section have good stress capacity.

[0025] Preferably, the adjacent middle sections are bonded and the middle sections and the adjacent end sections are bonded, so that all the middle sections and all the end sections are connected to form a whole, which is simple to operate and convenient to install.

[0026] Preferably, the adjacent middle sections are bonded into a whole by an epoxy resin adhesive, and the middle sections and the adjacent end sections are bonded into a whole by an epoxy resin adhesive.

[0027] The epoxy resin adhesive is a kind of adhesive with excellent bonding performance and chemical stability, which is used for repairing and adhering concrete and is suitable for high-strength and special environment application scenarios.

[0028] Preferably, the middle section and the end section are both steel fiber reinforced concrete structures.

[0029] Steel fiber reinforced concrete is a new type of multi-phase composite material formed by mixing short steel fibers in random distribution in ordinary concrete.

[0030] The middle segment and the end segment are both without steel bars, and bear tension by prestressed steel strands and steel fiber reinforced concrete, so that artificial cost is reduced, and steel bar binding and other construction periods are saved.

[0031] In the second aspect, the utility model provides a hollow slab bridge structure, containing lower structure, support component and hollow slab beam structure, hollow slab beam structure is set up on lower structure through support component.

[0032] The hollow slab bridge structure avoids the problem that the hinge joint component is prone to diseases in the use process, and the bridge is safer.

[0033] Preferably, it also includes leveling layer, bridge deck pavement layer and crash barrier, the leveling layer is arranged on the top surface of the hollow slab beam structure, the bridge deck pavement layer is arranged on the leveling layer, and the crash barrier is arranged on the transverse two sides of the leveling layer.

[0034] The upper part of the middle segment is continuous in the transverse direction, which can avoid the subsidence of the leveling layer and the bridge deck pavement layer, and ensure the smooth and safe passing of vehicles.

[0035] Compared with the prior art, the utility model has the beneficial effects that:

[0036] 1. The utility model provides a hollow slab beam structure, all the middle segments are sequentially and continuously arranged between two end segments along the length direction of the end segments, all the middle segments and all the end segments are connected to form a whole, and the prestressed steel strands are arranged in the corresponding cavities of all the middle segments and the corresponding prestressed steel strand reserved holes of the two end segments, the two ends of the prestressed steel strands are anchored to the two end segments, so that the hollow slab beam structure meets the stress capacity, and the upper part of the middle segment is continuous in the transverse direction, so that the hinge joint component is not needed to be arranged, and the problem that the hinge joint component is prone to diseases in the use process is avoided.

[0037] 2. The utility model provides a hollow slab bridge structure, the hinge joint is cancelled in the hollow slab beam structure, the problem that the hinge joint component is prone to diseases in the use process is avoided, and the bridge is safer. DRAWINGS

[0038] Figure 1 The utility model provides a hollow slab beam structure schematic view (in the figure, the prestressed steel strand is a dashed line);

[0039] Figure 2 is a cross-sectional structural view at the end segment;

[0040] Figure 3 is a three-dimensional structural schematic view of the end segment;

[0041] Figure 4 is a cross-sectional structural view at the middle segment;

[0042] Figure 5 is a three-dimensional structural schematic view of the middle segment;

[0043] Figure 6 is a side schematic view of the hollow slab bridge structure provided by the present application.

[0044] Markings in the figure: 11, middle segment; 111, cavity; 112, upper circulating segment; 113, lower circulating segment; 114, bottom segment; 12, end segment; 121, prestressed steel bundle reserved hole; 13, prestressed steel bundle; 2, leveling layer; 3, bridge deck pavement layer; 4, anti-collision guardrail; 5, supporting member; 6, substructure. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below in connection with specific embodiments. However, it should not be understood that the above-mentioned subject matter of the present application is limited to the following embodiments only, and any technology realized based on the content of the present application falls within the scope of the present application.

[0046] In the description of the embodiments of the present application, the terms of orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are expressed based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / device / apparatus of the present application is usually used. These terms of orientation or position relationship are only for the convenience of describing the present application or simplifying the description in the embodiments, and for the convenience of the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / part / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present application.

[0047] In addition, if the terms "horizontal", "vertical", "suspended", "parallel" and the like appear, it does not mean that the corresponding device / component / element is absolutely horizontal or vertical or suspended or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", not that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "suspended", "parallel" and the like, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8%, more preferably an error / deviation of ±6%, more preferably an error / deviation of ±5%, more preferably an error / deviation of ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the utility model scheme.

[0048] In addition, the terms "first", "second", "third" and the like in the terms are only used to distinguish the description of the same or similar parts, and should not be understood as emphasizing or implying the relative importance of the specific parts.

[0049] In addition, in the description of the embodiments of the utility model, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9 and the like in any case, and even more than 9.

[0050] In addition, in the description of the technical scheme of the utility model, unless otherwise specified / limited / limited, the terms "set", "install", "connect", "connect", "set", "lay", "arrange" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, which can be welding, riveting, bolting, screw connection and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements.

[0051] Embodiment 1

[0052] As shown in Figures 1-5 , a hollow slab beam structure includes two end segments 12, a plurality of middle segments 11 and a plurality of prestressed steel strands 13.

[0053] As shown in Figure 2 and Figure 3 , the end segment 12 is provided with a prestressed steel strand reserved hole 121, which is arranged axially along the longitudinal direction of the end segment 12. The longitudinal direction of the end segment 12 is the inside-out direction of Figure 2 , and is also the left-right direction in Figure 1 ;

[0054] As Figure 4 and Figure 5 shown, all the middle segments 11 are sequentially and continuously arranged between the two end segments 12 along the length direction of the end segments 12, all the middle segments 11 and all the end segments 12 are connected to form a whole, the middle segments 11 are provided with cavities 111 corresponding to the prestressed steel beam reserved holes 121, the cavities 111 pass through the middle segments 11 in the longitudinal direction, and the upper part of the middle segments 11 is continuous in the transverse direction;

[0055] As Figure 1 , Figure 2 and Figure 4 shown, the prestressed steel beam 13 is arranged in the corresponding cavities 111 of all the middle segments 11 and the corresponding prestressed steel beam reserved holes 121 of the two end segments 12, and the two ends of the prestressed steel beam 13 are anchored to the two end segments 12. As Figure 2 shown, the prestressed steel beam 13 is arranged in the upper and lower parts of the hollow slab beam structure, and the number of prestressed steel beams 13 in each row is determined according to the transverse size of the hollow slab beam structure; and the prestressed steel beams 13 are arranged in the left and right directions of the hollow slab beam structure, and the prestressed steel beams 13 in the upper and lower directions are arranged correspondingly. Prestress is an engineering structure design and construction technology, in order to improve the performance of the structure under load, the structure is pre-stressed during construction, and the pre-stressed structure can completely or partially offset the tensile stress caused by the load during service, avoiding structural damage, commonly used in concrete structures. Prestressed steel beam is a component used in prestressed concrete structures, mainly used to apply pre-tension in concrete to enhance the tensile properties of concrete. Prestressed technology aims to offset the tensile weakness of concrete under stress by introducing pre-tension in concrete, thereby improving the load-carrying capacity and durability of the structure. Prestressed steel beam is generally made of high-strength steel, which can be in the form of strips, spirals or bundles. These steel beams are embedded in concrete and subjected to tensioning operation in the prestressing process to apply pre-designed tension. Once the steel beam is tensioned to the designed prestress level, it will be anchored in the concrete to transfer the prestressed force to the concrete structure.

[0056] The hollow slab beam structure described in this embodiment, all the middle segments 11 are sequentially and continuously arranged between two end segments 12 along the length direction of the end segment 12, all the middle segments 11 and all the end segments 12 are connected to form a whole, and the prestressed steel beam 13 is arranged in the corresponding cavities 111 of all the middle segments 11 and the corresponding prestressed steel beam reserved holes 121 of the two end segments 12, and the two ends of the prestressed steel beam 13 are correspondingly anchored in the two end segments 12, so that the hollow slab beam structure meets the stress capacity, and the upper part of the middle segment 11 is continuous in the transverse direction, thereby avoiding the need to set the hinge joint member, and avoiding the problem that the hinge joint member is prone to diseases during use.

[0057] In some embodiments, the middle segment 11 and the end segment 12 are both prefabricated components, which can realize assembly construction.

[0058] In some embodiments, the middle segment 11 and the end segment 12 are both 3D printed structures, which are simpler to prefabricate, do not need to erect and remove the formwork, reduce labor costs, and save construction period. 3D printing concrete is an advanced building technology that uses 3D printing technology to build buildings or structures by layering concrete. Its working principle is similar to traditional 3D printing, but it uses specially designed concrete, which usually includes fine-grained cement, aggregate, and additives, such as the middle segment 11 and the end segment 12 being steel fiber reinforced concrete structures. Steel fiber reinforced concrete is a new type of multiphase composite material formed by mixing randomly distributed short steel fibers into ordinary concrete. These randomly distributed steel fibers can effectively prevent the expansion of micro-cracks and the formation of macro-cracks in concrete, significantly improving the tensile, bending, impact, and fatigue resistance of concrete, and having good ductility. The print head is controlled by a series of control systems and sprays concrete layer by layer according to the predetermined design, gradually building the entire structure. This technology has many advantages, including high degree of automation, fast construction, high degree of design freedom, one-step forming, and material saving.

[0059] In some embodiments, the cross-section of the middle segment 11 is a closed loop, which includes a loop segment that is continuous in the transverse direction of the middle segment 11, and the cavity 111 is located in the enclosed area of the loop segment and / or between adjacent loop segment enclosed areas. The closed loop cross-sectional form is adopted, the 3D printing head runs the path of the loop segment, and the running path is connected at both ends, and 3D printing runs multiple loop segments to complete the prefabrication of the middle segment 11. The advantage of this design is that the middle segment 11 has good integrity, the 3D printing work can maintain continuity, and there is basically no loss in the conventional pouring method of concrete in the pouring engineering. For example, Figure 4 and Figure 5As shown, the closed loop comprises an upper loop segment 112, a lower loop segment 113 and a bottom segment 114; one end of the upper loop segment 112 on the lateral two sides of the middle segment 11 is connected to one end of the lower loop segment 113 downward, the other end is connected to one end of the bottom segment 114 downward, the two ends of the upper loop segment 112 in the middle part of the middle segment 11 are connected to the adjacent ends of the two adjacent lower loop segments 113; the two adjacent upper loop segments 112 are continuous in the lateral direction of the middle segment 11, and the two adjacent lower loop segments 113 are continuous in the lateral direction of the middle segment 11; the inner surrounding area of the upper loop segment 112 forms the cavity 111, and the cavity 111 is formed between the adjacent lower loop segments 113 and the bottom segment 114. The above design makes the upper part and the lower part of the middle segment 11 continuous in the lateral direction, so that the integrity of the middle segment 11 is good, and the stress capacity of the upper part and the lower part of the middle segment 11 is good.

[0060] In some embodiments, adjacent middle segments 11 are bonded and the middle segment 11 and adjacent end segments 12 are bonded to form a whole, which is simple to operate and convenient to install. In some embodiments, adjacent middle segments 11 are bonded into a whole by an epoxy resin adhesive, and the middle segment 11 and adjacent end segments 12 are bonded into a whole by an epoxy resin adhesive. The epoxy resin adhesive is a kind of adhesive with excellent bonding performance and chemical stability, which is used for repairing and attaching concrete and is suitable for high-strength and special environment application scenarios.

[0061] The hollow slab beam structure of the embodiment cancels the hinge joint component, thereby avoiding the problem that the hinge joint component is prone to diseases during use; the hollow slab beam structure adopts a brand-new structure form to realize full assembly of the component; the hollow slab beam structure is free of steel bars and bears tension by prestressed steel strands 13 and steel fiber concrete, thereby reducing labor cost and saving construction period; the middle segment 11 of the hollow slab beam structure adopts 3D printed steel fiber concrete, which eliminates the need for erecting and removing formwork, thereby reducing labor cost and saving construction period; the middle segment 11 of the hollow slab beam structure adopts a relatively special cross-sectional form composed of the paths of the 3D printing nozzle running in cycles, and the paths are connected at the beginning and the end, and the 3D printing runs multiple cycles to complete the prefabrication of the middle segment 11. The advantage of this design is that the integrity of the middle segment 11 is good, the 3D printing work can maintain continuity, and there is basically no loss in the pouring engineering of the conventional pouring method of concrete.

[0062] Embodiment 2

[0063] As Figures 1-6As shown, a hollow slab bridge structure includes a substructure 6, a supporting member 5, the hollow slab beam structure described in Embodiment 1, a leveling layer 2, a bridge deck pavement layer 3, and a crash barrier 4, the hollow slab beam structure is arranged on the substructure 6 through the supporting member 5, the leveling layer 2 is arranged on the top surface of the hollow slab beam structure, the bridge deck pavement layer 3 is arranged on the leveling layer 2, and the crash barrier 4 is arranged on the transverse sides of the leveling layer 2; the upper part of the middle segment 11 is continuous in the transverse direction, which can avoid the subsidence of the leveling layer 2 and the bridge deck pavement layer 3, and ensure the smooth and safe passing of vehicles. The substructure 6 can be a pier column, a bent cap, etc., and the supporting member 5 can be a support structure, etc.

[0064] The construction of the hollow slab bridge structure described in the embodiment includes the following steps:

[0065] First, the middle segment 11 of the hollow slab beam structure and the end segment 12 of the hollow slab beam structure are prefabricated in a prefabrication yard. The middle segment 11 is printed as a whole by using a 3D printing technology, and the whole contains a cavity 111, as shown in Figure 5 The printing material is steel fiber reinforced concrete; the end segment 12 is printed as a whole by using a 3D printing technology, as shown in Figure 3 The printing material is steel fiber reinforced concrete, and the end segment 12 is reserved with a prestressed steel tendon reserved hole 121.

[0066] Then, the prefabricated middle segment 11 of the hollow slab beam structure and the end segment 12 of the hollow slab beam structure are transported to the bridge site, the end segment 12 of the hollow slab beam structure and the middle segment 11 of the hollow slab beam structure are connected as a whole by using an epoxy resin adhesive, and the connection sequence is the end segment 12 of the hollow slab beam structure + several middle segments 11 of the hollow slab beam structure + the end segment 12 of the hollow slab beam structure, as shown in Figure 1 Then, the prestressed steel tendon 13 is inserted from the prestressed steel tendon reserved hole 121 at one end, passes through the cavities 111 of several middle segments 11 of the hollow slab beam structure, as shown in Figure 4 and is then pulled out from the prestressed steel tendon reserved hole 121 at the other end, and finally the prestressed steel tendon 13 is tensioned and anchored on the end segment 12 of the hollow slab beam structure, as shown in Figure 2 The prestressed steel tendon 13 has two functions, one is to transmit prestress to the hollow slab beam structure, and the other is to connect the middle segment 11 of the hollow slab beam structure and the end segment 12 of the hollow slab beam structure together, as shown in Figure 1

[0067] As shown in Figure 6 ​As shown, the supporting member 5 is installed on the substructure 6; then the hollow slab beam structure is hoisted and placed on the supporting member 5. The function of the supporting member 5 is to transfer the load between the hollow slab beam structure and the substructure 6, and to adjust the horizontal and vertical position of the hollow slab beam structure to ensure that the bridge maintains good geometry during use to meet design requirements. The supporting member 5 is prior art.

[0068] like Figure 6 As shown, the leveling layer 2, made of steel fiber reinforced concrete, is poured onto the hollow slab beam structure. The bridge deck pavement layer 3 is then poured onto the leveling layer 2. The function of the leveling layer 2 is to fill the gaps and provide a flat base for the bridge deck pavement layer 3. Finally, the crash barriers 4 are poured on both sides of the bridge deck pavement layer 3.

[0069] The hollow slab bridge structure described in this plan eliminates hinge joints, avoiding the problems that hinge joint components are prone to during use, thus making the bridge safer. Furthermore, the prefabrication and assembly method simplifies construction.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hollow slab beam structure, characterized in that, include Two end segments (12), each end segment (12) is provided with a prestressed steel strand reserved hole (121), the prestressed steel strand reserved hole (121) is axially arranged along the longitudinal direction of the end segment (12); A number of intermediate segments (11) are arranged sequentially and continuously between two end segments (12) along the length direction of the end segments (12). All the intermediate segments (11) and all the end segments (12) are connected to form an integral whole. Each intermediate segment (11) is provided with a cavity (111) corresponding to the prestressed steel strand reserved hole (121). The cavity (111) is longitudinally connected in the intermediate segment (11), and the upper part of the intermediate segment (11) is continuous in the transverse direction. If the prestressed steel strand (13) is used, the prestressed steel strand (13) is inserted into the corresponding cavity (111) of all the middle segments (11) and the corresponding prestressed steel strand reserved hole (121) of the two end segments (12), and the two ends of the prestressed steel strand (13) are anchored to the two end segments (12).

2. The hollow slab beam structure according to claim 1, characterized in that, Both the middle segment (11) and the end segment (12) are prefabricated components.

3. The hollow slab beam structure according to claim 2, characterized in that, Both the middle segment (11) and the end segment (12) are 3D printed structures.

4. The hollow slab beam structure according to claim 2, characterized in that, The cross-sectional shape of the middle segment (11) is a closed loop, the closed loop including a continuous cyclic segment along the transverse direction of the middle segment (11), and the cavity (111) is located within the enclosed area of ​​the cyclic segment and / or between adjacent enclosed areas of the cyclic segment.

5. The hollow slab beam structure according to claim 4, characterized in that, The closed loop includes an upper loop segment (112), a lower loop segment (113), and a bottom segment (114); One end of the upper circulation segment (112) on both sides of the middle segment (11) is connected downward to one end of the lower circulation segment (113), and the other end is connected downward to one end of the bottom segment (114). The two ends of the upper circulation segment (112) in the middle of the middle segment (11) are connected to the adjacent ends of the two adjacent lower circulation segments (113). Two adjacent upper loop segments (112) are laterally continuous in the middle segment (11), and two adjacent lower loop segments (113) are laterally continuous in the middle segment (11); The cavity (111) is formed within the enclosed area of ​​the upper circulation segment (112), and the cavity (111) is formed between the adjacent lower circulation segment (113) and the bottom segment (114).

6. The hollow slab beam structure according to claim 2, characterized in that, Adjacent middle segments (11) are bonded together and the middle segments (11) and adjacent end segments (12) are bonded together, so that all the middle segments (11) and all the end segments (12) are connected to form a whole.

7. The hollow slab beam structure according to claim 6, characterized in that, The adjacent middle segments (11) are bonded together as a whole by epoxy resin adhesive, and the middle segments (11) and the adjacent end segments (12) are bonded together as a whole by epoxy resin adhesive.

8. The hollow slab beam structure according to any one of claims 1-7, characterized in that, Both the middle segment (11) and the end segment (12) are steel fiber reinforced concrete structures.

9. A hollow slab bridge structure, characterized in that, The device includes a lower structure (6), a support member (5), and a hollow slab beam structure as described in any one of claims 1-8, wherein the hollow slab beam structure is mounted on the lower structure (6) via the support member (5).

10. The hollow slab bridge structure according to claim 9, characterized in that, It also includes a leveling layer (2), a bridge deck pavement layer (3), and a crash barrier (4). The leveling layer (2) is set on the top surface of the hollow slab beam structure, the bridge deck pavement layer (3) is set on the leveling layer (2), and the crash barrier (4) is set on both sides of the leveling layer (2).

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