UHPC (Ultra High Performance Concrete) combined box girder
By adopting a combination design of UHPC roof panel and glued wood panels in the wood-concrete combined box girder, the problems of large thickness and low tensile strength of ordinary concrete slabs are solved, and the rapid assembly and stable connection of the structure are achieved, the construction difficulty and self-weight are reduced, and the durability and economicality of the bridge are improved.
Patent Information
- Application Number
- CN202421952268.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-13
AI Technical Summary
In the prior art, the required slab thickness of ordinary concrete slabs is large, which leads to a large self-weight of the wooden-concrete combination box beam, and the tensile strength of ordinary concrete is low, prone to cracking and leaking, resulting in a decrease in durability of the wooden main beam. Especially in the base concrete in the tensioned area, more measures are needed to ensure crack resistance safety, increase construction difficulty and weaken economicality.
UHPC combined box girders are adopted, including UHPC roof, glued wood web and glued wood base plate. They are prefabricated and transported to the assembly site. The buffer blocks are used to prevent high-temperature breakage, and the connecting blocks and limiting screws are used to achieve quick connection. The sliding bars and limiting screws ensure the structure is stable, and the fixing mechanism is easy to disassemble and transport.
Through the combination of UHPC roof panels and glued wood panels, rapid assembly and stable connection of the structure are achieved, reducing construction difficulty and self-weight, and improving the durability and economicality of the bridge.
Smart Images
Figure CN223033815U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridges, in particular to a UHPC composite box girder. Background Art
[0002] UHPC composite box girder is a new type of bridge structural element with extremely high strength and durability. It is composed of UHPC and steel bars and can play an important role in bridges with large spans and heavy loads. The characteristics of UHPC composite box girder include excellent bending and compression resistance, as well as good durability and corrosion resistance, making it increasingly popular in bridge engineering. This structural design not only improves the overall performance of the bridge, but also reduces the structural thickness and self-weight, effectively saving construction costs and improving construction efficiency.
[0003] After searching, the Chinese patent announcement number is: CN218090468U, which discloses a UHPC-stiffened steel-concrete composite box girder, including a box girder body composed of a precast concrete panel, a steel box girder web and a bottom plate; a plurality of stiffening rib units are arranged in the box girder body along the length direction of the box girder body at intervals, and the stiffening rib units include symmetrically arranged left web UHPC stiffening ribs, right web UHPC stiffening ribs and bottom plate UHPC stiffening ribs, and the left web UHPC stiffening ribs, the right web UHPC stiffening ribs and the bottom plate UHPC stiffening ribs are arranged at intervals. The C stiffening rib is cast in one piece; a plurality of shear nails are pre-buried at intervals in the left web UHPC stiffening rib, the right web UHPC stiffening rib and the bottom plate UHPC stiffening rib, and the bottoms of the plurality of shear nails are welded to the box girder body. The beneficial effects of the utility model are: reducing the steel consumption of the traditional steel box girder and improving the economy of the steel-concrete composite box girder; reducing the welding engineering volume of the traditional steel box girder and greatly reducing the fatigue problem of the steel box girder; at the same time, reducing the welding workload, facilitating construction, and greatly improving the economy and durability.
[0004] However, in actual use, the required thickness of ordinary concrete slabs is relatively large, which makes the deadweight of the wood-concrete composite box girder relatively large. In addition, ordinary concrete has low tensile strength and is prone to cracking and leakage, which reduces the durability of the wooden main beam. Especially for the bottom slab concrete located in the tension zone, more measures are needed to ensure its crack resistance and safety, which increases the difficulty of construction and weakens its economy. Utility Model Content
[0005] In order to make up for the above shortcomings, the utility model provides a UHPC composite box girder, which aims to improve the problem that the ordinary concrete slab in the prior art requires a large slab thickness, which makes the deadweight of the wood-concrete composite box girder too large, and the ordinary concrete has low tensile strength and is prone to cracking and leakage, resulting in reduced durability of the wood main beam. In particular, for the bottom slab concrete located in the tension zone, more measures need to be taken to ensure its crack resistance safety, which increases the difficulty of construction and weakens its economy.
[0006] To achieve the above object, the utility model adopts the following technical scheme: a UHPC composite box girder, including a base, a support column is fixedly connected to the top end of the base, a limit block is fixedly connected to the top end of the support column, a glued laminated wood bottom plate is arranged on the top end of the limit block, glued laminated wood web plates are fixedly connected to the front and rear sides of the top end of the glued laminated wood bottom plate, a UHPC top plate is fixedly connected to the top ends of the glued laminated wood web plates, a plurality of buffer blocks are fixedly connected to the left and right sides of the UHPC top plate, limiting screws are fixedly connected to the front and rear sides of the UHPC top plate, the outer side of the limiting screw penetrates through the connecting block, and a fixing mechanism is arranged on the top end of the limit block, and the fixing mechanism is used for facilitating disassembly and transportation.
[0007] As a further description of the above technical scheme:
[0008] The fixing mechanism includes a plurality of grooves, the plurality of grooves are opened on the top end of the limit block, a sliding bar is fixedly connected to the bottom of the glued laminated wood web plate, the sliding bar is engaged with the groove, a limiting screw is arranged on the right side of the limit block, the outer wall of the limiting screw penetrates through the limit block and the sliding bar and is threadedly connected with a fixing nut, a plurality of fixing screws are fixedly connected to the bottom of the UHPC top plate, and the outer wall of the fixing screw penetrates through the glued laminated wood web plate and is threadedly connected with a fixing nut.
[0009] As a further description of the above technical scheme:
[0010] Drainage holes are opened on the front and rear sides of the UHPC top plate, and a drain pipe is fixedly connected to the inner wall of the drainage hole.
[0011] As a further description of the above technical scheme:
[0012] A utility pole is fixedly connected to the top end of the UHPC top plate, and a street lamp is fixedly connected to the top end of the utility pole.
[0013] As a further description of the above technical scheme:
[0014] A ladder is fixedly connected to the front side of the support column, and guardrails are fixedly connected to the left and right sides of the top end of the support column.
[0015] As a further description of the above technical scheme:
[0016] A first support plate is fixedly connected to the rear side of the top end of the glued laminated wood bottom plate, and a second support plate is fixedly connected to the front side of the top end of the glued laminated wood bottom plate.
[0017] As a further description of the above technical scheme:
[0018] A plurality of ventilation holes are provided on the outer side of the glued laminated wood web, and a wire duct is provided in the middle of the top end of the glued laminated wood bottom plate.
[0019] As a further description of the above technical solution:
[0020] The glued laminated wood bottom plate can be engaged with the adjacent glued laminated wood bottom plate, and a connecting plate is fixedly connected to the right side of the glued laminated wood bottom plate.
[0021] The utility model has the following beneficial effects:
[0022] 1. In the utility model, through the UHPC top plate, the glued laminated wood web and the glued laminated wood bottom plate, they can be prefabricated and transported to the assembly site. Place the glued laminated wood bottom plate on the support column, and the buffer block can prevent fracture caused by high temperature. The connecting block and the limiting screw connect the adjacent UHPC top plates together, and the assembly can be completed quickly.
[0023] 2. In the utility model, through the sliding strip, it is convenient for the bridge to slide in the groove when moving. The limiting screw connects the limiting block and the glued laminated wood bottom plate, and the fixing nut strengthens the fixation. The fixing screw connects the UHPC top plate and the glued laminated wood bottom plate, which can ensure the stability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is the front view of a UHPC composite box girder proposed by the utility model;
[0025] Figure 2 It is the three-dimensional view of a UHPC composite box girder proposed by the utility model;
[0026] Figure 3 It is the structural schematic diagram of the UHPC top plate of a UHPC composite box girder proposed by the utility model;
[0027] Figure 4 It is the structural schematic diagram of the base of a UHPC composite box girder proposed by the utility model;
[0028] Figure 5 It is the structural schematic diagram of the fixing mechanism of a UHPC composite box girder proposed by the utility model.
[0029] Legend Explanation:
[0030] 1. Base; 2. Fixing mechanism; 201. Groove; 202. Sliding bar; 203. Limit screw; 204. Fixing nut; 205. Fixing screw; 206. Fixing nut; 3. Support column; 4. Limiting block; 5. Glulam web; 6. Glulam bottom plate; 7. UHPC top plate; 8. Buffer block; 9. Connecting block; 10. Defining screw; 11. Connecting plate; 12. Drain pipe; 13. Drain hole; 14. Electric pole; 15. Street lamp; 16. Ladder; 17. Guardrail; 18. First support plate; 19. Second support plate; 20. Ventilation hole; 21. Electric wire duct. Detailed implementation mode
[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0032] Refer to Figure 2 , Figure 3 and Figure 4 , an embodiment provided by the present invention: A UHPC composite box girder includes a base 1. A support column 3 is fixedly connected to the top end of the base 1. A limiting block 4 is fixedly connected to the top end of the support column 3. A glulam bottom plate 6 is arranged at the top end of the limiting block 4. Glulam webs 5 are fixedly connected to the front and rear sides of the top end of the glulam bottom plate 6. A UHPC top plate 7 is fixedly connected to the top end of the glulam web 5. A plurality of buffer blocks 8 are fixedly connected to the left and right sides of the UHPC top plate 7. Defining screws 10 are fixedly connected to the front and rear sides of the UHPC top plate 7. The outside of the defining screw 10 penetrates through the connecting block 9. A fixing mechanism 2 is arranged at the top end of the limiting block 4. The fixing mechanism 2 is for facilitating disassembly and transportation.
[0033] Specifically, the UHPC top plate 7, the glulam web 5 and the glulam bottom plate 6 can be prefabricated, and then it is convenient to transport them to the place where assembly is required by vehicle. Place the glulam bottom plate 6 above the support column 3. The buffer block 8 can prevent fracture caused by thermal expansion and contraction due to high temperature in high temperature conditions. The adjacent UHPC top plates 7 can be connected together under the fixation of the defining screw 10 through the connecting block 9.
[0034] Refer to Figure 3 and Figure 5, the fixing mechanism 2, the fixing mechanism 2 includes a plurality of grooves 201, the plurality of grooves 201 are opened at the top of the limiting block 4, a sliding bar 202 is fixedly connected to the bottom of the glued laminated wood web 5, the sliding bar 202 is engaged with the groove 201, a limiting screw 203 is arranged on the right side of the limiting block 4, the outer wall of the limiting screw 203 penetrates through the limiting block 4 and the sliding bar 202 and is threadedly connected with a fixing nut 204, and a plurality of fixing screws 205 are fixedly connected to the bottom of the UHPC top plate 7, the outer wall of the fixing screw 205 penetrates through the glued laminated wood web 5 and is threadedly connected with a fixing nut 206;
[0035] Specifically, the sliding bar 202 can facilitate the sliding of the glued laminated wood web 5 only in the groove 201 above the limiting block 4 when the bridge moves. The limiting screw 203 can connect the limiting block 4 to the glued laminated wood bottom plate 6, and the fixing nut 204 can firmly fix it. The fixing screw 205 can connect the UHPC top plate 7 to the glued laminated wood bottom plate 6.
[0036] Refer to Figure 1 , Figure 2 and Figure 4 , drain holes 13 are opened on the front and rear sides of the UHPC top plate 7, and a drain pipe 12 is fixedly connected to the inner wall of the drain hole 13; a utility pole 14 is fixedly connected to the top of the UHPC top plate 7, and a street lamp 15 is fixedly connected to the top of the utility pole 14; a ladder 16 is fixedly connected to the front side of the support column 3, and guardrails 17 are fixedly connected to the left and right sides of the top of the support column 3; a first support plate 18 is fixedly connected to the rear side of the top of the glued laminated wood bottom plate 6, and a second support plate 19 is fixedly connected to the front side of the top of the glued laminated wood bottom plate 6; a plurality of ventilation holes 20 are opened on the outer side of the glued laminated wood web 5, and a wire duct 21 is arranged in the middle of the top of the glued laminated wood bottom plate 6; the glued laminated wood bottom plate 6 can be engaged with the adjacent glued laminated wood bottom plate 6, and a connecting plate 11 is fixedly connected to the right side of the glued laminated wood bottom plate 6;
[0037] Specifically, the drain holes 13 can facilitate the drainage of rainwater on the top of the UHPC top plate 7, which is discharged through the drain pipe 12. The utility pole 14 can facilitate the support of the street lamp 15, and the street lamp 15 can facilitate the provision of lighting. The ladder 16 can facilitate the maintenance personnel to repair the bridge. The guardrails 17 can facilitate the prevention of accidental falls of the maintenance personnel. The first support plate 18 and the second support plate 19 can facilitate the improvement of the firmness between the glued laminated wood web 5 and the UHPC top plate 7. The connecting plate 11 can facilitate the connection of the bridge.
[0038] Working principle: Before using the device, first, the UHPC top plate 7, the glulam web 5, and the glulam bottom plate 6 can all be prefabricated, and then conveniently transported to the designated assembly location by vehicle. During the assembly process, the glulam bottom plate 6 is placed above the support column 3. To ensure the stability of the structure in a high-temperature environment, through the buffer block 8, it can prevent the risk of fracture caused by the thermal expansion and contraction effect. In addition, through the combined use of the connecting block 9 and the limiting screw 10, it can ensure the fixation of adjacent UHPC top plates 7 and achieve stable connection. And through the fixing mechanism 2, the sliding bar 202 can optimize the operation of the bridge during movement, ensuring that it only slides within the groove 201 above the limiting block 4. By applying the limiting screw 203, the limiting block 4 can be firmly connected to the glulam bottom plate 6. In addition, with the fastening effect of the fixing nut 204, the stability of the connection is ensured. At the same time, the UHPC top plate 7 and the glulam bottom plate 6 are tightly connected by using the fixing screw 205 to ensure the stability and reliability of the overall structure.
[0039] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A UHPC composite box girder, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a support column (3), the top of the support column (3) is fixedly connected to a limit block (4), the top of the limit block (4) is provided with a plywood base plate (6), the front and rear sides of the top of the plywood base plate (6) are fixedly connected to a plywood web plate (5), the top of the plywood web plate (5) is fixedly connected to a UHPC top plate (7), the left and right sides of the UHPC top plate (7) are fixedly connected to a plurality of buffer blocks (8), the front and rear sides of the UHPC top plate (7) are fixedly connected to limit screws (10), the outer side of the limit screws (10) passes through the connection block (9), and the top of the limit block (4) is provided with a fixing mechanism (2), the fixing mechanism (2) is used to facilitate disassembly and transportation.
2. The UHPC composite box girder according to claim 1, characterized in that: The fixing mechanism (2) comprises a plurality of grooves (201), wherein the plurality of grooves (201) are formed at the top of the limit block (4); a sliding bar (202) is fixedly connected to the bottom of the plywood web (5); the sliding bar (202) is engaged with the groove (201); a limiting screw (203) is arranged on the right side of the limit block (4); an outer wall of the limiting screw (203) passes through the limit block (4) and the sliding bar (202) and is threadedly connected to a fixing nut (204); and a plurality of fixing screws (205) are fixedly connected to the bottom of the UHPC top plate (7); an outer wall of the fixing screw (205) passes through the plywood web (5) and is threadedly connected to a fixing nut (206).
3. The UHPC composite box girder according to claim 1, characterized in that: Drain holes (13) are provided on the front and rear sides of the UHPC top plate (7), and a drainage pipe (12) is fixedly connected to the inner wall of the drainage hole (13).
4. The UHPC composite box girder according to claim 1, characterized in that: The top end of the UHPC top plate (7) is fixedly connected to a power pole (14), and the top end of the power pole (14) is fixedly connected to a street lamp (15).
5. The UHPC composite box girder according to claim 1, characterized in that: A ladder (16) is fixedly connected to the front side of the support column (3), and guardrails (17) are fixedly connected to the left and right sides of the top end of the support column (3).
6. The UHPC composite box girder according to claim 1, characterized in that: A first support plate (18) is fixedly connected to the rear side of the top end of the plywood bottom plate (6), and a second support plate (19) is fixedly connected to the front side of the top end of the plywood bottom plate (6).
7. The UHPC composite box girder according to claim 1, characterized in that: A plurality of ventilation holes (20) are provided on the outer side of the plywood web (5), and an electric wire duct (21) is provided at the middle of the top end of the plywood bottom plate (6).
8. The UHPC composite box girder according to claim 1, characterized in that: The plywood base plate (6) can be engaged with the plywood base plate (6) on an adjacent side, and a connecting plate (11) is fixedly connected to the right side of the plywood base plate (6).