Rapid construction anti-collision guardrail structure based on UHPC (Ultra High Performance Concrete) and construction method of rapid construction anti-collision guardrail structure

Abstract

The invention belongs to the technical field of bridge structure buildings, and discloses a UHPC (Ultra High Performance Concrete)-based rapid construction anti-collision guardrail structure which comprises two end modules and a plurality of middle modules, each end module is provided with an end pouring space which is formed by connecting an inner side UHPC plate, an outer side UHPC plate, an end side UHPC plate and a connecting UHPC plate, and the three faces of each end pouring space are open; each middle module is provided with a middle pouring space which is formed by connecting an inner side UHPC plate, an outer side UHPC plate and a connecting UHPC plate, the four faces of each middle pouring space are open, the multiple middle modules are sequentially connected end to end through connecting pieces to form a middle body with the multiple pouring spaces communicated in sequence, and the two end modules are connected with the middle body end to end to form an overall pouring space with the closed end to end; and common concrete is poured in the integral pouring space. The invention further discloses a construction method of the rapid construction anti-collision guardrail structure based on the UHPC. According to the invention, the complex operation of building and removing the template on the construction site is reduced, the construction period is greatly shortened, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge structure construction, and in particular relates to a UHPC-based rapid construction anti-collision guardrail structure and a construction method thereof. Background Art

[0002] Existing bridge anti-collision guardrails mostly use cast-in-place concrete structures, which rely on on-site formwork support and pre-embedded steel bars in the bridge deck for pouring and construction. Although this construction process is mature and has good anti-collision performance, it still has many problems. First, the construction of cast-in-place concrete guardrails requires the erection of formwork, which occupies a large amount of space on the bridge deck. This not only affects the convenience of construction but also interferes with the normal flow of highway traffic, especially on bridges that need to be maintained during construction. In addition, the process of supporting and removing the formwork is cumbersome and time-consuming, further extending the construction period, increasing the difficulty of construction and disrupting traffic.

[0003] Although the steel formwork currently in use has high molding precision, it is heavy and has low efficiency in on-site transportation and installation. In order to reduce the construction burden, wooden or plastic formwork is also used, but these formworks lack rigidity and are easily deformed, resulting in irregular guardrail lines after pouring and difficulty in ensuring the appearance quality. At the same time, regardless of the formwork material, the cast-in-place process requires the formwork to be removed after the initial setting of the concrete, and there are still problems such as numerous processes and long cycles. In addition, the cast-in-place formwork structure will also interfere with the construction of parts such as the bridge pavement and drip eaves. The relevant processes must be carried out only after the formwork is completely removed, affecting the overall construction progress.

[0004] In order to improve the construction disadvantages of the above-mentioned cast-in-place method, there is currently a technical path to process guardrail segments through prefabrication and transport them to the site for assembly. Although this solution is conducive to improving construction efficiency and reducing interference with on-site operations, due to the large size and heavy weight of the prefabricated blocks, hoisting is difficult and there are major safety hazards. At the same time, after the prefabricated blocks are assembled, there are problems such as difficulty in unifying the linear shape and poor precision at the joints, which affect the overall aesthetics and performance of the structure. In addition, in order to reduce weight, the protective layer thickness of some prefabricated guardrails is insufficient, which can easily cause durability problems such as exposed steel bars, concrete erosion, and freeze-thaw damage, and also bring great inconvenience to subsequent maintenance. Summary of the Invention

[0005] The present invention provides a UHPC-based rapid construction anti-collision guardrail structure and a construction method thereof, in order to solve existing technical problems.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A rapid construction anti-collision guardrail structure based on UHPC includes two end modules and multiple middle modules, the end modules are provided with an end casting space with three sides opened by connecting an inner UHPC panel, an outer UHPC panel, an end side UHPC panel and a connecting UHPC panel, the middle module is provided with a middle casting space with four sides opened by connecting an inner UHPC panel, an outer UHPC panel and a connecting UHPC panel, the inner UHPC panel and the outer UHPC panel are arranged at intervals, the end side UHPC panel or the connecting UHPC panel is connected to the same side of the inner UHPC panel and the outer UHPC panel, the multiple middle modules are connected end to end in sequence by connecting pieces to form an intermediate body with multiple casting spaces connected in sequence, the two end modules are respectively connected to the end and end of the intermediate body to form an integral casting space closed end to end, and ordinary concrete is cast in the integral casting space.

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

[0009] An anchor is provided in the integral casting space, one end of the anchor is connected to the bridge deck, and the other end extends into the integral casting space and is anchored and connected to ordinary concrete.

[0010] A positioning piece is provided on the bridge deck, and the anchor piece is welded to the positioning piece.

[0011] The positioning piece is located on the outer side of the inner UHPC plate.

[0012] The bottom of the inner UHPC panel is connected to a foot plate member, and the foot plate member is welded to the structural steel bars in the inner UHPC panel and to the positioning member.

[0013] The foot plate member is located on the inner side of the inner UHPC panel.

[0014] The end modules and the middle module are both integrally formed.

[0015] The connecting parts include mortise and tenon that match each other, and the mortise and tenon are respectively provided on the connecting UHPC plates at the head and tail sides of the end module and the middle module.

[0016] A method for rapidly constructing a UHPC-based anti-collision guardrail structure comprises the following steps:

[0017] S1: Formwork prefabrication: The end modules and middle modules are prefabricated in the factory or on site using standardized steel formwork. The end modules and middle modules are all one-piece mortise and tenon box structures, and the foot plates are pre-fixed during the prefabrication stage. After prefabrication, they are cured to achieve the UHPC strength.

[0018] S2: Construction of embedded bridge deck parts: During the construction of the bridge deck, anchors and positioning parts are embedded in advance;

[0019] S3: Formwork installation: Use lifting equipment to hoist the end and middle modules to the corresponding positions on the bridge deck. Glue them together longitudinally with the tenons of adjacent formwork through the mortise and tenon grooves to form a longitudinally continuous structure with an integral casting space that is closed at both ends. Then, weld the footboards to the positioning pieces to complete the transverse positioning and reinforcement.

[0020] S4: Ordinary concrete filling: Ordinary concrete is poured into the integral pouring space to form a UHPC-ordinary concrete composite structure. During the pouring process, layer-by-layer vibration is required to ensure the density of the concrete and the integrity of the structure.

[0021] S5: Bridge deck paving and overall acceptance: After the ordinary concrete reaches the required strength, the paving layer is covered on the positioning parts.

[0022] As a further improvement of the above technical solution:

[0023] The length of the anchor extending into the overall casting space is not less than 60 cm.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] By setting up two end modules and multiple middle modules, an integrated casting space with closed ends and connected in the middle is cleverly constructed. Each module is prefabricated in the factory or on site. The inner and outer UHPC panels are stably connected by connecting UHPC panels or end UHPC panels to ensure precise and consistent spacing between the panels. Multiple middle modules are spliced end to end longitudinally through connectors to form an intermediate body with multiple casting spaces connected in sequence. This is then connected to the two end modules end to end, forming a continuous and complete casting space. Ordinary concrete is poured inside at one time, forming a composite structure of UHPC and ordinary concrete.

[0026] Compared to existing technologies, this method, through modular prefabrication of UHPC formwork, avoids the disruption to traffic flow caused by traditional cast-in-place guardrails, reduces the complex operations of erecting and dismantling formwork on the construction site, significantly shortens the construction period, and improves construction safety and efficiency. Furthermore, due to the lightweight, high-strength modules and their precise assembly, they overcome the problems of traditional large prefabricated segments, such as excessive weight, dangerous hoisting, and difficult assembly alignment, ensuring the continuity of the guardrail structure's appearance and consistent crashworthiness. Furthermore, the inclusion of conventional concrete reduces UHPC material costs, balances economic efficiency with durability, and reduces the difficulty of subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of a rapid construction crash barrier structure based on UHPC.

[0029] Figure 2 It is a structural diagram of the end module.

[0030] Figure 3 This is the structural diagram of the middle module Figure 1 .

[0031] Figure 4 This is the structural diagram of the middle module Figure 1 .

[0032] Figure 5 It is a schematic diagram of the connection structure of the anchor.

[0033] Figure 6 This is a schematic diagram of the connection structure of the anchor Figure 2 .

[0034] Figure 7 It is a structural diagram of anchoring parts and positioning parts.

[0035] Legend:

[0036] 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 piece; 5. Footboard; 6. Mortise and tenon; 7. Tenon; 8. Pavement layer. DETAILED DESCRIPTION

[0037] To facilitate understanding of the present invention, the present invention will be described in more comprehensive and detailed form below in conjunction with the accompanying drawings and preferred embodiments. However, the protection scope of the present invention is not limited to the following specific embodiments.

[0038] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0039] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0040] Example: Figure 1-Figure 7 As shown, the UHPC-based rapid construction anti-collision guardrail structure of this embodiment includes two end modules 1 and multiple middle modules 2. The end module 1 is composed of an inner UHPC panel 11, an outer UHPC panel 12, an end UHPC panel 13 and a connecting UHPC panel 14, forming an end casting space with three sides open. The middle module 2 is composed of an inner UHPC panel 11, an outer UHPC panel 12 and a connecting UHPC panel 14, forming a middle casting space with four sides open. The inner UHPC panel 11 and the outer UHPC panel 12 are arranged at intervals. The end UHPC panel 13 or the connecting UHPC panel 14 is connected to the same side of the inner UHPC panel 11 and the outer UHPC panel 12. The multiple middle modules 2 are sequentially connected end to end by connectors to form an intermediate body with multiple casting spaces sequentially connected. The two end modules 1 are respectively connected to the end and end of the intermediate body to form an integral casting space closed end to end, and ordinary concrete is poured in the integral casting space. By providing two end modules 1 and multiple middle modules 2, an integrated, monolithic casting space is cleverly constructed, closed at both ends and connected in the middle. Each module is prefabricated in a factory or on-site. 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. Multiple middle modules 2 are spliced end to end longitudinally via connectors to form an intermediate body with multiple casting spaces connected in sequence. This is then connected end to end with the two end modules 1, forming a continuous, complete casting space. Ordinary concrete is poured into the interior at one time, forming a composite structure of UHPC and ordinary concrete. The connectors can be bolts, straps, etc.

[0041] Compared to existing technologies, this embodiment, through modular prefabrication of UHPC formwork, avoids the disruption to traffic flow caused by traditional cast-in-place guardrails, reduces the complex operations of erecting and dismantling formwork on the construction site, significantly shortens the construction period, and improves construction safety and efficiency. Furthermore, the lightweight, high-strength modules and their precise assembly overcome the problems of traditional large prefabricated segments, such as excessive weight, dangerous hoisting, and difficult assembly alignment, ensuring the continuity of the guardrail structure's appearance and consistent crashworthiness. Furthermore, the use of internally embedded conventional concrete reduces UHPC material costs, balances economic efficiency with durability, and reduces the difficulty of subsequent maintenance.

[0042] In this embodiment, an anchor 3 is installed 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 conventional concrete. This forms a composite anchoring system between the steel bar, the UHPC panel, and the conventional concrete. Anchor 3, anchoring the steel bar, effectively improves the overall connection stiffness between the crash barrier structure and the bridge deck 100, enhancing the overall stability and resistance to displacement of the structure under impact loads.

[0043] In this embodiment, the bridge deck 100 is provided with positioning members 4, to which the anchor members 3 are welded. Pre-positioning the positioning members 4 on the bridge deck 100 and welding them to the anchor members 3 not only ensures the accurate positioning of the anchor members 3 during the initial installation of the formwork, preventing subsequent installation difficulties caused by displacement of the anchor members 3 during construction, but also enhances the strength and durability of the overall connection. This design makes the formwork hoisting, positioning, and vertical and horizontal installation processes more efficient and precise, further shortening the construction period, reducing construction errors, and improving the standardization and prefabrication of on-site construction.

[0044] In this embodiment, the positioning members 4 are located outside the inner UHPC panel 11. Since the positioning members 4 are positioned close to the inner side of the guardrail structure, not only does this facilitate direct welding of the footplate 5 to the positioning members 4 during guardrail module installation, simplifying the construction process, but it also effectively prevents the positioning members 4 from affecting the guardrail's appearance during construction. This arrangement not only ensures the concealment of the positioning nodes, enhancing the overall visual impact of the guardrail, but also facilitates subsequent paving, further improving the overall structural protection and durability.

[0045] In this embodiment, the bottom of the inner UHPC plate 11 is connected to a foot plate member 5, which is welded to the structural steel bars in the inner UHPC plate 11 and to the positioning member 4. The foot plate member 5 is a C-shaped channel steel. On the one hand, it is welded to the structural steel bars embedded in the inner UHPC plate 11, and on the other hand, it is welded to the positioning member 4 on the bridge deck 100, forming a double fixation. On the one hand, this connection method ensures the structural stability and pull-out resistance of the UHPC formwork after installation, and enhances the overall impact and vibration resistance; on the other hand, by prefabricating and fixing the foot plate member 5 in the factory, the tedious process of welding steel bars separately on site or adding connectors is avoided, which significantly improves construction efficiency and assembly accuracy. At the same time, double welding forms a firm and reliable connection between the formwork and the bridge deck 100, improving the durability and long-term service performance of the structure.

[0046] In this embodiment, the footplate 5 is located inside the inner UHPC panel 11. The footplate 5 is integrally embedded within the inner surface of the inner UHPC panel 11, preventing it from being exposed and enhancing the integrity and aesthetics of the guardrail. Furthermore, the concealed placement of the footplate 5 helps reduce direct environmental impact, extending its service life and reducing the risk of corrosion and maintenance. Furthermore, this arrangement effectively secures the formwork to the bridge deck 100 without increasing the overall structural dimensions, further enhancing the overall structural stability and safety of the guardrail.

[0047] In this embodiment, both the end modules 1 and the middle module 2 are integrally formed. Cast integrally in a prefabricated steel mold during the prefabrication phase, this avoids the joint weaknesses associated with traditional segmented casting followed by assembly. This integrated molding process significantly improves the overall strength and durability of the UHPC panels, reducing potential risks such as cracking and water seepage. Furthermore, this integrated molding process enhances the dimensional accuracy and surface quality of the modules, making subsequent hoisting and splicing smoother and more reliable. This further ensures the linear continuity and aesthetics of the guardrail structure, facilitating rapid and efficient on-site construction.

[0048] In this embodiment, the connectors include matching mortises 6 and tenons 7, respectively, located on the connecting UHPC panels 14 at the leading and trailing ends of the end modules 1 and middle module 2. The longitudinal mortise and tenon structure enables precise docking and secure connection between adjacent modules, enhancing the continuity and overall stability of the overall casting space. The coordination of mortise and tenon 6 and tenon 7 not only facilitates rapid on-site installation and positioning, but also improves splicing precision, reduces linear deviations caused by misalignment, further ensures the guardrail's exterior quality and mechanical performance, and effectively improves construction efficiency and safety.

[0049] In this embodiment, both the end modules 1 and the middle modules 2 are 100-130 cm long, 100-125 cm high, 55-65 cm wide, and 4-5 cm thick. They are modified with 2-3% steel fiber and nano-SiO2, ensuring a compressive strength greater than 120 MPa and a porosity between 2% and 6%. The mortise and tenon grooves 6 are 5-5.5 cm deep and 9.5-10.5 cm wide, forming a square shape with a top surface of 7-8 cm sides and a bottom surface of 9.5-10.5 cm sides.

[0050] The construction method of the UHPC-based rapid construction anti-collision guardrail structure of this embodiment includes the following steps: S1: Formwork prefabrication: Use a standardized steel formwork to prefabricate the end module 1 and the middle module 2 in a factory or on site. The end module 1 and the middle module 2 are both integrally formed mortise and tenon structures, and the foot plate 5 is pre-fixed in the prefabrication stage. After the prefabrication is completed, it is cured and reaches the UHPC strength; S2: Construction of bridge deck embedded parts: During the construction of the bridge deck 100, the anchor 3 and the positioning part 4 are pre-embedded in advance; S3: Formwork installation: Use hoisting equipment to install the end module 1 and The central module 2 is hoisted to the corresponding position on the bridge surface and longitudinally glued to the tenon 7 of the adjacent formwork through the mortise 6, forming a longitudinally continuous structure with an integral casting space that is closed at both ends. The foot plate 5 is then welded to the positioning member 4 to complete the transverse positioning and reinforcement. S4: Ordinary concrete filling: Ordinary concrete is poured into the integral casting space to form a UHPC-ordinary concrete composite structure. During the pouring process, it is necessary to vibrate the concrete layer by layer to ensure the density of the concrete and the integrity of the structure. S5: Bridge deck paving and overall acceptance: After the ordinary concrete reaches the required strength, the paving layer 8 is covered on the positioning member 4. This construction method simplifies the complex construction process of traditional cast-in-place concrete guardrails, reduces the impact on traffic, shortens the construction period, and improves construction efficiency. At the same time, the use of prefabricated modular structure ensures the stability and precision of the structure, avoids uncertainties in on-site construction, and improves the safety and quality control level of the entire construction process.

[0051] In this embodiment, the anchor 3 extends into the integral casting space for no less than 60 cm. 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 anti-collision guardrail structure. The longer anchor 3 improves the connection strength with the bridge deck 100, effectively preventing the guardrail structure from falling off or loosening due to impact or external forces during use. This design not only improves the safety of the overall structure but also helps improve fatigue resistance during long-term use.

Claims

1. A rapid construction anti-collision guardrail structure based on UHPC, characterized by: The invention comprises two end modules (1) and a plurality of middle modules (2), wherein the end modules (1) are connected by an inner UHPC plate (11), an outer UHPC plate (12), an end UHPC plate (13) and a connecting UHPC plate (14) to form an end casting space with three openings, and the middle module (2) is connected by an inner UHPC plate (11), an outer UHPC plate (12) and a connecting UHPC plate (14) to form a middle casting space with four openings. The outer UHPC panels (12) are arranged at intervals, the end UHPC panels (13) or the connecting UHPC panels (14) are connected to the same side of the inner UHPC panels (11) and the outer UHPC panels (12), a plurality of the middle modules (2) are sequentially connected end to end via connectors to form an intermediate body in which a plurality of casting spaces are sequentially connected, and the two end modules (1) are respectively connected to the end of the intermediate body via connectors to form an integral casting space that is enclosed end to end, wherein ordinary concrete is cast in the integral casting space.

2. The UHPC-based rapid construction anti-collision guardrail structure according to claim 1 is characterized in that: An anchor (3) is provided in 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 and connected to ordinary concrete.

3. The UHPC-based rapid construction anti-collision guardrail structure according to claim 2 is characterized in that: A positioning piece (4) is provided on the bridge deck (100), and the anchor piece (3) is welded to the positioning piece (4).

4. The UHPC-based rapid construction anti-collision guardrail structure according to claim 3 is characterized in that: The positioning member (4) is located outside the inner UHPC plate (11).

5. The UHPC-based rapid construction anti-collision guardrail structure according to claim 3 is characterized in that: A foot plate member (5) is connected to the bottom of the inner UHPC plate (11), and the foot plate member (5) is welded to the structural steel bars in the inner UHPC plate (11) and to the positioning member (4).

6. The UHPC-based rapid construction anti-collision guardrail structure according to claim 5 is characterized in that: The foot plate member (5) is located on the inner side of the inner UHPC plate (11).

7. The UHPC-based rapid construction anti-collision guardrail structure according to claim 1 is characterized in that: The end module (1) and the middle module (2) are both integrally formed.

8. The UHPC-based rapid construction anti-collision guardrail structure according to claim 1 is characterized in that: The connecting member comprises a mortise (6) and a tenon (7) that match each other, wherein the mortise (6) and the tenon (7) are respectively provided, and the mortise (6) and the tenon (7) are respectively provided on the connecting UHPC plates (14) at the head and tail sides of the end module (1) and the middle module (2).

9. A method for rapidly constructing a crash barrier structure based on UHPC, characterized in that: The following steps are involved: S1: Formwork prefabrication: The end modules (1) and the middle modules (2) are prefabricated in a factory or on site using a standard steel formwork. The end modules (1) and the middle modules (2) are both integrally formed mortise and tenon box structures. The foot plates (5) are pre-fixed during the prefabrication stage. After prefabrication, they are cured and the strength of the UHPC is achieved. S2: Construction of pre-embedded parts of the bridge deck: During the construction of the bridge deck, pre-embed anchors (3) and positioning parts (4); S3: Formwork installation: Use hoisting equipment to hoist the end modules (1) and the middle modules (2) to the corresponding positions on the bridge surface, and glue them longitudinally with the tenons (7) of the adjacent formwork through the mortise and tenon grooves (6) to form a longitudinal continuous structure with an integral casting space closed at both ends, and then weld the foot plate (5) and the positioning member (4) to complete the transverse positioning and reinforcement; S4: Ordinary concrete filling: Ordinary concrete is poured into the integral pouring space to form a UHPC-ordinary concrete composite structure. During the pouring process, layer-by-layer vibration is required to ensure the density of the concrete and the integrity of the structure. S5: Bridge deck paving and overall acceptance: After the ordinary concrete reaches the required strength, a paving layer (8) is placed on the positioning piece (4).

10. The construction method of the UHPC-based rapid construction anti-collision guardrail structure according to claim 9 is characterized in that: The length of the anchor (3) extending into the integral casting space is not less than 60 cm.

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