A rapid construction crash barrier structure based on UHPC

Abstract

The utility model belongs to bridge structure building technical field discloses a kind of rapid construction crash barrier structure based on UHPC, including two end modules and multiple middle modules, end module is equipped with end pouring space, middle module is equipped with middle pouring space, end module and the connecting UHPC board of middle module head and tail two sides are respectively equipped with tenon groove and tenon, tenon groove and tenon are mutually matched, multiple middle modules are sequentially head and tail connection and form the middle main body that multiple pouring spaces are sequentially communicated, two end modules are respectively connected with the head and tail of middle main body and form the overall pouring space that head and tail are closed, ordinary concrete is poured in overall pouring space, anchor is equipped in overall pouring space, one end of anchor is connected with deck slab, and another end extends to overall pouring space, and is anchored connection with ordinary concrete.The utility model reduces the complex operation of construction site erection and template removal, greatly shortens construction period, improves construction safety and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of bridge structure construction technology, and in particular relates to a rapid construction anti-collision guardrail structure based on UHPC. Background Technology

[0002] Existing bridge crash barriers mostly utilize cast-in-place concrete structures, which rely on on-site formwork support and pre-embedded steel reinforcement in the bridge deck for construction. While this construction technique is mature and offers good crash protection, it presents several problems. First, the construction of cast-in-place concrete barriers requires formwork erection, occupying significant bridge deck space. This not only affects construction convenience but also disrupts normal traffic flow, especially on bridges requiring maintenance to ensure traffic flow. Furthermore, the cumbersome and time-consuming process of formwork erection and dismantling further extends the construction period, increases construction difficulty, and exacerbates traffic disruption.

[0003] While currently used steel formwork offers high forming precision, its heavy weight leads to low efficiency in on-site handling and installation. To reduce the construction burden, wooden or plastic formwork is also used, but these types of formwork lack rigidity and are prone to deformation, resulting in irregular railing lines and inconsistent appearance quality after pouring. Furthermore, regardless of the formwork material, the cast-in-place process requires formwork removal after the concrete has initially set, still presenting problems such as numerous procedures and long construction periods. In addition, cast-in-place formwork structures can interfere with the construction of bridge pavement layers and drip edges, requiring complete formwork removal before these processes can proceed, thus affecting the overall construction progress.

[0004] To address the drawbacks of cast-in-place construction, a technical approach has emerged that involves prefabricating guardrail segments, transporting them to the site, and assembling them. While this method improves construction efficiency and reduces on-site interference, the large size and weight of the prefabricated blocks make hoisting difficult and pose significant safety hazards. Furthermore, the assembled prefabricated blocks suffer from inconsistent alignment and poor precision at joints, affecting the overall aesthetics and performance of the structure. Additionally, to reduce weight, some prefabricated guardrails have insufficient protective layers, leading to durability issues such as exposed rebar, concrete erosion, and freeze-thaw damage, causing considerable inconvenience for later maintenance. Utility Model Content

[0005] This invention provides a rapid construction crash barrier structure based on UHPC to solve existing technical problems.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0007] A rapid-construction crash barrier structure based on UHPC includes two end modules and multiple middle modules. The end modules have a three-sided open end casting space formed by an inner UHPC plate, an outer UHPC plate, an end-side UHPC plate, and connecting UHPC plates. The middle modules have a four-sided open middle casting space formed by an inner UHPC plate, an outer UHPC plate, and connecting UHPC plates. The connecting UHPC plates on both ends of the end and middle modules are respectively provided with tenons and mortises, which match each other. The inner UHPC... The C-panel and the outer UHPC panel are spaced apart. The end UHPC panel or connecting UHPC panel is connected to the same side of the inner UHPC panel and the outer UHPC panel. Multiple middle modules are connected end to end in sequence to form a middle main body with multiple pouring spaces connected in sequence. Two end modules are respectively connected to the beginning and end of the middle main body to form a closed overall pouring space. Ordinary concrete is poured in the overall pouring space. Anchors are provided in the overall pouring space. One end of the anchor is connected to the bridge deck, and the other end extends into the overall pouring space and is anchored to the ordinary concrete.

[0008] As a further improvement to the above technical solution:

[0009] The bridge deck is provided with positioning components, and the anchors are welded to the positioning components.

[0010] The positioning element is located on the outside of the inner UHPC plate.

[0011] The bottom of the inner UHPC plate is connected to a foot plate, which is welded to the structural steel bars inside the inner UHPC plate and to the positioning component.

[0012] The foot plate is located inside the inner UHPC plate.

[0013] Both the end module and the middle module are integrally formed.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] By setting up two end modules and multiple middle modules, an integrated casting space that is closed at both ends and connected in the middle is cleverly constructed. Each module is prefabricated in the factory or on-site. The inner UHPC panels are stably connected to the outer UHPC panels through connecting UHPC panels or end UHPC panels, ensuring that the spacing between each panel is precise and consistent. Multiple middle modules are spliced ​​longitudinally end to end through mortise and tenon structures to form a central main body with multiple casting spaces connected sequentially. This body then connects to the two end modules at both ends, forming a continuous and complete casting space. Ordinary concrete is then poured into the interior in one go, forming a composite structure of UHPC and ordinary concrete.

[0016] The anchors are anchoring steel bars, which effectively improve the overall connection stiffness between the crash barrier structure and the bridge deck, and enhance the overall stability and anti-thrust performance of the structure under impact loads.

[0017] By setting up a longitudinal mortise and tenon structure, adjacent modules can be precisely connected and firmly joined, which enhances the continuity and overall stability of the overall pouring space. The fit between the tenon and the groove not only facilitates quick on-site installation and positioning, but also improves the splicing accuracy, reduces the linear deviation caused by misalignment, further ensures the appearance quality and load-bearing performance of the guardrail, and effectively improves construction efficiency and safety.

[0018] Compared to existing technologies, this invention, through modular prefabrication of UHPC templates, avoids the interference with traffic organization caused by traditional cast-in-place guardrails, reduces the complex operations of setting up and dismantling templates on construction sites, significantly shortens the construction cycle, and improves construction safety and efficiency. Simultaneously, due to the lightweight, high-strength, and precise splicing of the modules, it overcomes the problems of excessive weight, dangerous hoisting, and difficulty in controlling the assembly alignment of traditional large prefabricated segments, ensuring the continuity of the guardrail structure's appearance and the consistency of its impact resistance. Furthermore, the use of internal ordinary concrete saves on UHPC material costs, balancing economy and durability, and reducing the difficulty of later maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural diagram of a rapid construction crash barrier structure based on UHPC.

[0021] Figure 2 This is a structural diagram of the end module.

[0022] Figure 3 This is a structural diagram of the middle module. Figure 1 .

[0023] Figure 4 This is a structural diagram of the middle module. Figure 1 .

[0024] Figure 5 This is a schematic diagram of the connection structure of the anchor.

[0025] Figure 6 This is a schematic diagram of the connection structure of the anchor. Figure 2 .

[0026] Figure 7 This is a structural diagram of the anchor and positioning components.

[0027] Legend:

[0028] 100. Bridge deck; 1. End module; 11. Inner UHPC panel; 12. Outer UHPC panel; 13. End UHPC panel; 14. Connecting UHPC panel; 2. Middle module; 3. Anchor; 4. Positioning component; 5. Foot plate component; 6. Mortise and tenon; 7. Tenon; 8. Pavement layer. Detailed Implementation

[0029] To facilitate understanding of this utility model, the following description will be provided in more comprehensive and detailed manner with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0030] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0031] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0032] Example: Figures 1-7As shown, the UHPC-based rapid construction crash barrier structure of this embodiment includes two end modules 1 and multiple middle modules 2. The end modules 1 are three-sided open end casting spaces formed by connecting the inner UHPC plate 11, the outer UHPC plate 12, the end-side UHPC plate 13, and the connecting UHPC plate 14. The middle modules 2 are four-sided open middle casting spaces formed by connecting the inner UHPC plate 11, the outer UHPC plate 12, and the connecting UHPC plate 14. The inner UHPC plate 11 and the outer UHPC plate 12 are spaced apart. The end-side UHPC plate 13 or the connecting UHPC plate 14 is connected to the same side of the inner UHPC plate 11 and the outer UHPC plate 12. The multiple middle modules 2 are connected end to end to form a middle main body with multiple casting spaces connected in sequence. The two end modules 1 are respectively connected to the beginning and end of the middle main body to form a closed overall casting space. Ordinary concrete is poured in the overall casting space. By setting up two end modules 1 and multiple middle modules 2, an integrated, monolithic casting space with closed ends and connected middle is cleverly constructed. Each module is prefabricated in the factory or on-site and then installed on the bridge deck 100. The inner UHPC panel 11 and the outer UHPC panel 12 are stably connected by connecting UHPC panels 14 or end UHPC panels 13, ensuring precise and consistent spacing between the panels. The multiple middle modules 2 are longitudinally spliced ​​end to end using mortise and tenon joints to form a central main body with multiple casting spaces connected sequentially. This body then connects to the two end modules 1, forming a continuous and complete casting space. Ordinary concrete is poured into the space in one go, and the ordinary concrete connects with the bridge deck 100 to form a composite structure of UHPC and ordinary concrete.

[0033] Compared to existing technologies, this embodiment avoids the interference with traffic organization caused by traditional cast-in-place guardrails through modular prefabrication of UHPC templates, reduces the complex operations of setting up and dismantling templates on construction sites, significantly shortens the construction cycle, and improves construction safety and efficiency. Simultaneously, due to the lightweight, high-strength, and precise splicing of the modules, it overcomes the problems of excessive weight, hoisting hazards, and difficulty in controlling the assembly alignment of traditional large prefabricated segments, ensuring the continuity of the guardrail structure's appearance and the consistency of its impact resistance. Furthermore, the use of internal ordinary concrete saves on UHPC material costs, balancing economy and durability, and reducing the difficulty of later maintenance.

[0034] In this embodiment, anchors 3 are provided within the integral casting space. One end of the anchor 3 is connected to the bridge deck 100, and the other end extends into the integral casting space and is anchored to the ordinary concrete. This forms a composite anchoring system between the reinforcing steel, the UHPC slab, and the ordinary concrete. The anchor 3 serves as an anchoring steel bar, effectively improving the overall connection stiffness between the crash barrier structure and the bridge deck 100, and enhancing the overall stability and anti-thrust performance of the structure under impact loads.

[0035] In this embodiment, the UHPC plates 14 connecting the end modules 1 and the middle modules 2 are respectively provided with mortise and tenon joints 6 and mortise and tenon joints 7, which match each other. By setting a longitudinal mortise and tenon structure, adjacent modules can achieve precise docking and firm connection, enhancing the continuity and overall stability of the overall casting space. The cooperation between the mortise and tenon joints 6 and 7 not only facilitates rapid on-site installation and positioning, but also improves splicing accuracy, reduces linear deviation caused by misalignment, further ensures the appearance quality and load-bearing performance of the guardrail, and effectively improves construction efficiency and safety.

[0036] In this embodiment, a positioning element 4 is provided on the bridge deck 100, and the anchor 3 is welded to the positioning element 4. By pre-setting the positioning element 4 on the bridge deck 100 and welding it to the anchor 3, not only is the positional accuracy of the anchor 3 in the early stage of formwork installation guaranteed, avoiding subsequent installation difficulties caused by the displacement of the anchor 3 during construction, but the overall strength and durability of the connection node are also improved. This design makes the formwork hoisting, positioning, and longitudinal and transverse installation processes more efficient and precise, further shortening the construction period, reducing construction errors, and improving the standardization and prefabricated operation level of on-site construction.

[0037] In this embodiment, the positioning component 4 is located on the outer side of the inner UHPC plate 11. Because the positioning component 4 is positioned close to the inner side of the guardrail structure, it not only facilitates direct welding of the foot plate component 5 to the positioning component 4 during guardrail module installation, simplifying the construction process, but also effectively prevents the positioning component 4 from affecting the appearance of the guardrail during construction. This arrangement ensures the concealment of the positioning node, enhances the overall aesthetic effect of the guardrail, and facilitates the subsequent coverage of the bridge deck pavement layer, further improving the overall protective performance and durability of the structure.

[0038] In this embodiment, a foot plate 5 is connected to the bottom of the inner UHPC panel 11. The foot plate 5 is welded to the structural steel bars inside the inner UHPC panel 11 and to the positioning member 4. The foot plate 5 is a C-shaped channel steel, which is welded to the pre-embedded structural steel bars inside the inner UHPC panel 11 and to the positioning member 4 on the bridge deck 100, forming a double fixation. This connection method ensures the structural stability and pull-out resistance of the UHPC template after installation, and enhances the overall impact and vibration resistance. On the other hand, by prefabricating and fixing the foot plate 5 in the factory, the cumbersome process of welding steel bars or adding connectors on site is avoided, significantly improving construction efficiency and assembly accuracy. At the same time, the double welding forms a strong and reliable connection between the template and the bridge deck 100, improving the durability and long-term service performance of the structure.

[0039] In this embodiment, the foot plate 5 is located inside the inner side of the inner UHPC panel 11. The foot plate 5 is entirely embedded in one side of the inner surface of the inner UHPC panel 11, preventing it from being exposed and improving the integrity and aesthetics of the guardrail. Furthermore, the concealed arrangement of the foot plate 5 helps reduce direct corrosion from the external environment, extending its service life and reducing rust and maintenance risks. Simultaneously, this arrangement achieves effective fixation between the template and the bridge deck 100 without increasing the overall structural dimensions, further enhancing the stability and safety performance of the guardrail structure.

[0040] In this embodiment, both the end module 1 and the middle module 2 are integrally molded. During the prefabrication stage, they are cast as a whole using a standardized steel mold, avoiding the weaknesses of joints that arise from traditional segmented casting followed by assembly. This integral molding process significantly improves the overall strength and durability of the UHPC panel, reducing potential problems such as cracking and water seepage. Simultaneously, integral molding also enhances the dimensional accuracy and surface quality of the modules, making subsequent hoisting and splicing smoother and more reliable, further ensuring the continuity and aesthetics of the guardrail structure's lines, and facilitating rapid and efficient on-site construction.

[0041] In this embodiment, both end module 1 and middle module 2 are 100-130cm long, 100-125cm high, 55-65cm wide, and 4-5cm thick. They are both modified with steel fiber (2-3%) and nano-SiO2 to ensure a compressive strength >120MPa and a porosity between 2% and 6%. The tenon 6 is 5-5.5cm deep and 9.5-10.5cm wide, square, with a top surface of 7-8cm and a bottom surface of 9.5-10.5cm.

[0042] The construction method of the rapid construction crash barrier structure based on UHPC in this embodiment includes the following steps: S1: Template prefabrication: The end modules 1 and the middle modules 2 are prefabricated as a whole using standardized steel molds in the factory or on site. Both end modules 1 and the middle modules 2 are integrally formed tenon box structures, and the foot plates 5 are pre-fixed during the prefabrication stage. After prefabrication, curing is carried out to achieve UHPC strength; S2: Bridge deck embedded part construction: During the construction of the bridge deck 100, anchors 3 and positioning parts 4 are pre-embedded; S3: Template installation: The end modules 1 and the middle modules 2 are installed using hoisting equipment. The central module 2 is hoisted to the corresponding position on the bridge deck. It is then longitudinally bonded to the tenon 7 of the adjacent template via tenon groove 6, forming a longitudinally continuous structure with a closed-end integral pouring space. The foot plate 5 is then welded to the positioning component 4 to complete the lateral positioning and reinforcement. S4: Ordinary concrete filling: Ordinary concrete is poured within the integral pouring space to form a UHPC-ordinary concrete composite structure. Layered vibration is required during pouring to ensure concrete density and structural integrity. S5: Bridge deck paving and overall acceptance: After the ordinary concrete reaches its strength, the paving layer 8 is covered on the positioning component 4. This construction method simplifies the complex construction process of traditional cast-in-place concrete guardrails, reduces traffic impact, shortens the construction cycle, and improves construction efficiency. Simultaneously, the use of a prefabricated modular structure ensures structural stability and precision, avoids uncertainties in on-site construction, and enhances the safety and quality control level of the entire construction process.

[0043] In this embodiment, the anchor 3 extends at least 60cm into the overall cast-in-place space. This ensures that the anchor 3 is fully embedded and tightly connected to the ordinary concrete, thereby enhancing the stability and impact resistance of the crash barrier structure. The longer anchor 3 length increases the connection strength with the bridge deck 100, effectively preventing the barrier structure from detaching or loosening due to impact or external forces during use. This design not only improves the overall structural safety but also helps improve fatigue resistance during long-term use.

Claims

1. A rapid construction crash barrier structure based on UHPC, characterized in that, It includes two end modules (1) and multiple middle modules (2). The end modules (1) are three-sided open end casting spaces formed by connecting the inner UHPC plate (11), the outer UHPC plate (12), the end UHPC plate (13), and the connecting UHPC plate (14). The middle modules (2) are four-sided open middle casting spaces formed by connecting the inner UHPC plate (11), the outer UHPC plate (12), and the connecting UHPC plate (14). The connecting UHPC plates (14) on both ends of the end modules (1) and the middle modules (2) are respectively provided with mortises (6) and tenons (7). The mortises (6) and tenons (7) match each other. The inner UHPC plate (11) and the outer UHPC plate (12) are spaced apart. The end UHPC plate (13) or connecting UHPC plate (14) is connected to the same side of the inner UHPC plate (11) and the outer UHPC plate (12). Multiple middle modules (2) are connected end to end in sequence to form a middle main body with multiple pouring spaces connected in sequence. Two end modules (1) are respectively connected to the beginning and end of the middle main body to form an overall pouring space that is closed at the beginning and end. Ordinary concrete is poured in the overall pouring space. Anchors (3) are provided in the overall pouring space. One end of the anchor (3) is connected to the bridge deck (100) and the other end extends into the overall pouring space and is anchored to the ordinary concrete.

2. The rapid construction crash barrier structure based on UHPC according to claim 1, characterized in that, The bridge deck (100) is provided with a positioning element (4), and the anchor (3) is welded to the positioning element (4).

3. The rapid construction crash barrier structure based on UHPC according to claim 2, characterized in that, The positioning element (4) is located on the outside of the inner UHPC plate (11).

4. The rapid construction crash barrier structure based on UHPC according to claim 3, characterized in that, The bottom of the inner UHPC plate (11) is connected to a foot plate (5), which is welded to the structural steel bars inside the inner UHPC plate (11) and to the positioning member (4).

5. The rapid construction crash barrier structure based on UHPC according to claim 4, characterized in that, The foot plate (5) is located inside the inner side of the inner UHPC plate (11).

6. The rapid construction crash barrier structure based on UHPC according to claim 5, characterized in that, Both the end module (1) and the middle module (2) are integrally formed.

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