Fully-externally-wrapped UHPC shell-NC combined ribbed slab bridge
By fully outsourcing the UHPC shell-NC combined ribbed bridge structure, using UHPC materials as the shell and the NC structure inside the NC structure, the chloride ion erosion and construction difficulty of the bridge are solved, and the durability and crack resistance of the bridge are achieved. Improvement, while simplifying the construction process.
Patent Information
- Application Number
- CN202420747783.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-11
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-11
AI Technical Summary
The bridges along the coastal wave splashing area have caused corrosion of steel bars, reduced durability of concrete, and cracking due to chloride ion erosion and wave load. Traditional ribbed bridge construction has problems such as inconvenience and large engineering volume in hoisting and bracket foundation treatment.
The fully outsourcing UHPC shell-NC combined ribbed bridge structure is adopted, and the prefabricated UHPC lower shell is used as a template to form the NC structure and the UHPC upper shell in cast-in-place. The connection is enhanced by anchoring steel bars to enhance the anti-chlorine ion penetration and mechanical properties and simplify the construction process.
It improves the durability and crack resistance of the bridge in the splash zone, reduces construction costs, and avoids the problem of large amount of bracket foundation treatment projects.
Smart Images
Figure CN222160910U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridges, and in particular to a fully outer-clad UHPC shell-NC combined rib plate bridge. Background Art
[0002] Bridges in coastal splash zones are subject to severe corrosion, mainly chloride ion erosion. Bridge structures have problems such as severe steel corrosion, reduced concrete durability, concrete breakage and cracking. Due to long-term wave loads and dry-wet effects, the bridge decks of bridges in splash zones will also suffer varying degrees of damage. In the prior art, multi-layer anti-corrosion measures are often used to protect bridges in splash zones to extend the time required for chloride ions to penetrate the protective layer or to improve the corrosion resistance of steel bars, such as replacing high-durability marine concrete, using stainless steel bars or anti-corrosion coatings on the concrete surface. In addition, the main problems with traditional ribbed bridge construction methods in coastal splash zones include inconvenient hoisting construction and a large amount of support foundation treatment work.
[0003] In view of this, it is necessary to provide a new coastal splash zone rib bridge structure to solve the above technical problems. Utility Model Content
[0004] The technical problem to be solved by the utility model is to provide a fully outer-clad UHPC shell-NC combined rib plate bridge, which simplifies anti-corrosion measures to facilitate construction and utilizes UHPC to improve the durability and crack resistance of the bridge structure in the splash zone.
[0005] The technical solution of the utility model is as follows:
[0006] A fully-enclosed UHPC shell-NC composite ribbed bridge comprises a prefabricated UHPC lower shell, an NC structure cast in situ using the UHPC lower shell as a template, and a UHPC upper shell cast in situ on the surface of the NC structure, wherein the UHPC lower shell and the UHPC upper shell enclose a closed section.
[0007] Furthermore, the UHPC lower shell and the NC structure, as well as the NC structure and the UHPC upper shell are connected by anchoring steel bars.
[0008] Furthermore, the UHPC lower shell includes a beam-rib area and a flange area connected to each other, the beam-rib area is pre-embedded with rib steel bars, and the flange area is pre-embedded with straight-insertion connecting steel bars.
[0009] Furthermore, stress-bearing steel bars are arranged in the UHPC lower shell.
[0010] Furthermore, the NC structure and the UHPC upper shell are connected via U-shaped anchor steel bars.
[0011] Furthermore, structural steel bars are arranged in the NC structure.
[0012] Compared with the prior art, the fully outer-clad UHPC shell-NC combined rib bridge provided by the utility model has the following beneficial effects:
[0013] 1. The fully-clad UHPC shell-NC composite rib bridge provided by the utility model has an outer layer of ultra-high performance concrete (UHPC) material, which has super strong resistance to chloride ion penetration, can protect its internal ordinary reinforced concrete (NC) from corrosion, and greatly improves the durability of the bridge in the splash zone environment.
[0014] 2. The fully-enclosed UHPC shell-NC composite rib plate bridge provided by the utility model adopts UHPC material as the shell and fills the NC structure inside the shell. The UHPC shell can enhance its tensile, compressive and bending mechanical properties, and has a restraining effect on the ordinary concrete inside, which can act as a partial prestress, showing excellent crack resistance and can improve the problem of concrete damage and cracking.
[0015] 3. The fully-outerwrapped UHPC shell-NC combined ribbed bridge provided by the utility model has a prefabricated lower UHPC shell. During the bridge construction, the lower UHPC shell of the ribbed bridge is hoisted onto the cap beam, which serves as a formwork and support. When pouring the NC structure, there is no need to set up a bracket and secondary formwork and demolding. The construction is relatively convenient and avoids the problem of large amount of bracket foundation treatment engineering. Therefore, the fully-outerwrapped UHPC shell-NC combined ribbed bridge of the utility model fully utilizes the performance of the outer layer UHPC material while reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 It is a cross-sectional schematic diagram of the fully outer-clad UHPC shell-NC composite rib plate bridge of the utility model;
[0018] Figure 2 It is a schematic diagram of the UHPC lower shell being installed on the cap beam in the utility model;
[0019] Figure 3 It is a structural schematic diagram of the UHPC lower shell in the fully outer-clad UHPC shell-NC combined rib plate bridge of the utility model;
[0020] Figure 4It is a partial structural schematic diagram of the UHPC lower shell in the utility model;
[0021] Figure 5 It is a schematic diagram of the template structure used for forming the rib reinforcement of the lower shell of the UHPC in the utility model;
[0022] Figure 6 It is a schematic diagram of the cast-in-place NC structure in the fully enclosed UHPC shell-NC composite rib slab bridge of the utility model;
[0023] Figure 7 It is a schematic diagram of casting the UHPC upper shell in the fully outer-clad UHPC shell-NC combined rib plate bridge of the utility model. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are further described below.
[0025] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as there is no conflict between them.
[0026] See also Figure 1 and Figure 2 ,in Figure 1 This is a cross-sectional schematic diagram of the fully outer-clad UHPC shell-NC combined rib plate bridge of the utility model. Figure 2 It is a schematic diagram of the UHPC lower shell installed on the cap beam in the utility model. The fully enclosed UHPC shell-NC composite rib plate bridge of the utility model includes a pier 1, a cap beam 2 arranged on the pier 1, a UHPC lower shell 3 installed on the cap beam 2, an NC structure 4 cast in situ using the UHPC lower shell 3 as a template, a UHPC upper shell 5 cast in situ on the surface of the NC structure, and a bridge deck system 6 laid on the surface of the UHPC upper shell 5. Among them, the UHPC lower shell 3 and the UHPC upper shell 5 enclose a closed area, so that the NC structure 4 is enclosed in the UHPC shell to avoid wave erosion.
[0027] Please refer to Figure 3-Figure 4 ,in Figure 3 It is a structural schematic diagram of the UHPC lower shell in the fully outer-clad UHPC shell-NC combined rib plate bridge of the utility model; Figure 4It is a partial structural schematic diagram of the UHPC lower shell in the utility model. In the utility model, the UHPC lower shell 3 and the NC structure 4, as well as the NC structure 4 and the UHPC upper shell 5 are connected by anchoring steel bars. Specifically, the UHPC lower shell 3 includes a beam rib area 31 and a flange area 32 connected to each other. The beam rib area 31 is pre-embedded with a row of rib steel bars 33 along the longitudinal bridge direction, and the flange area 32 is pre-embedded with straight-inserted connecting steel bars 34. The interface connection between the UHPC lower shell 3 and the NC structure 4 is strengthened by the row of rib steel bars 33 and the straight-inserted connecting steel bars 34. In this embodiment, the row of rib steel bars 33 and the straight-inserted connecting steel bars 34 are in an "I" shape.
[0028] The method for making the rib reinforcement 33 is as follows: Figure 5 As shown, when prefabricating the lower shell of the UHPC, a hole 201 is reserved at a corresponding position on the template 200. When pouring the UHPC, steel bars are embedded in the reserved hole to form rib steel bars in the beam rib area.
[0029] In this embodiment, in order to bear the construction load during the ordinary concrete pouring process, the UHPC lower shell needs to be arranged with stress-bearing steel bars 36 when it is prefabricated in the factory. If the span is large, prestressed steel strands can be appropriately arranged.
[0030] Please refer to Figure 6 and Figure 7 ,in Figure 6 This is a schematic diagram of the cast-in-place NC structure in the fully enclosed UHPC shell-NC composite rib slab bridge of the utility model. Figure 7 It is a schematic diagram of casting the UHPC upper shell in the fully enclosed UHPC shell-NC composite rib slab bridge of the utility model. The NC structure 4 is arranged with structural steel bars 41 and U-shaped anchor steel bars 42, wherein the structural steel bars 41 are arranged in the beam rib area of the UHPC lower shell to improve the strength and stability of the structure, and the U-shaped anchor steel bars 42 are pre-embedded and used to achieve the connection between the NC structure and the UHPC upper shell 5. In this embodiment, the NC structure can be provided with fewer or no stress-bearing steel bars, with the structural steel bars 41 as the main ones.
[0031] The construction method of the fully outer-clad UHPC shell-NC composite rib bridge of the utility model is as follows:
[0032] (1) The UHPC lower shell is prefabricated in the factory, then transported to the construction site and hoisted onto the cap beam as a whole;
[0033] (2) Using the UHPC shell as the formwork and support, tying the structural steel bars, pouring ordinary concrete NC, and embedding U-shaped anchor steel bars;
[0034] (3) Curing the ordinary concrete NC to the design strength, casting the UHPC upper shell, so that the UHPC upper shell and the UHPC lower shell seal the ordinary concrete NC structure;
[0035] (4) After the UHPC upper shell is cured, the bridge deck system is cast to form a fully enclosed UHPC shell-NC composite rib slab bridge in the coastal splash zone.
[0036] Compared with the prior art, the fully outer-clad UHPC shell-NC combined rib bridge provided by the utility model has the following beneficial effects:
[0037] 1. The fully-enclosed UHPC shell-NC composite rib plate bridge provided by the utility model adopts UHPC material as the shell and fills the NC structure inside the shell. The UHPC shell can enhance its tensile, compressive and bending mechanical properties, and has a restraining effect on the ordinary concrete inside, which can act as a partial prestress, showing excellent crack resistance and can improve the problem of concrete damage and cracking.
[0038] 2. The fully-clad UHPC shell-NC combined rib bridge provided by the utility model has an outer layer of UHPC material, which has super strong resistance to chloride ion penetration, can protect the ordinary reinforced concrete inside from corrosion, and greatly improves the durability of the bridge in the splash zone environment.
[0039] 3. The fully-outerwrapped UHPC shell-NC combined ribbed bridge provided by the utility model has a prefabricated lower UHPC shell. During the bridge construction, the lower UHPC shell of the ribbed bridge is hoisted onto the cap beam, which serves as a formwork and support. When pouring the NC structure, there is no need to set up a bracket and secondary formwork and demolding. The construction is relatively convenient and avoids the problem of large amount of bracket foundation treatment engineering. Therefore, the fully-outerwrapped UHPC shell-NC combined ribbed bridge of the utility model fully utilizes the performance of the outer layer UHPC material while reducing the construction cost.
[0040] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principle and spirit of the present invention still fall within the scope of protection of the present invention.
Claims
1. A fully outer-clad UHPC shell-NC composite rib bridge, characterized in that: It includes a prefabricated UHPC lower shell, an NC structure cast in situ using the UHPC lower shell as a template, and a UHPC upper shell cast in situ on the surface of the NC structure. The UHPC lower shell and the UHPC upper shell enclose a closed area.
2. The fully outer-clad UHPC shell-NC composite rib plate bridge according to claim 1 is characterized in that: The UHPC lower shell and the NC structure, as well as the NC structure and the UHPC upper shell are connected by anchoring steel bars.
3. The fully outer-clad UHPC shell-NC composite rib bridge according to claim 2 is characterized in that: The UHPC lower shell includes a beam-rib area and a flange area connected to each other, the beam-rib area is pre-embedded with rib steel bars, and the flange area is pre-embedded with straight-insertion connecting steel bars.
4. The fully outer-clad UHPC shell-NC composite rib bridge according to any one of claims 1 to 3, characterized in that: Stress-bearing steel bars are arranged in the UHPC lower shell.
5. The fully outer-clad UHPC shell-NC composite rib bridge according to claim 2 is characterized in that: The NC structure and the UHPC upper shell are connected via U-shaped anchor steel bars.
6. The fully outer-clad UHPC shell-NC composite rib bridge according to claim 5 is characterized in that: Structural steel bars are arranged in the NC structure.