Fabricated inverted arched girder slope supporting system and construction method thereof

Abstract

The invention relates to the technical field of slope supporting, in particular to a fabricated inverted arched beam slope supporting system and a construction method thereof. The side slope supporting system comprises an inverted arched beam, and the arch back side of the inverted arched beam faces the slope surface of a side slope; the anchoring connecting pieces are connected with the ends of the multiple inverted arched beams, and the two ends of each inverted arched beam are each connected with one anchoring connecting piece; and the anchor cable fixing structures penetrate through the corresponding anchoring connecting pieces to be connected with the side slope, so that an integral structure formed by connecting the inverted arched beams and the anchoring connecting pieces is fixed to the side slope.

Description

Technical Field

[0001] This invention relates to the field of slope protection technology, and in particular to a prefabricated anti-arch beam slope protection system and its construction method. Background Technology

[0002] Slope protection engineering is an important field in geotechnical engineering, widely used in highway, railway, water conservancy, mining, and building foundation projects. Its core purpose is to ensure the stability and safety of slopes and prevent geological disasters such as landslides and collapses. Currently, prestressed anchor cable frame beam support structures are one of the mainstream solutions for treating medium- and high-rise slopes. This structure consists of cast-in-place reinforced concrete frame beams and prestressed anchor cables. The enormous anchoring force of the anchor cables is transferred to the frame beams through anchor piers at the joints, and then distributed to the entire slope surface by the frame beams, thus forming effective active support for unstable rock and soil masses.

[0003] However, existing traditional frame beam structures have many inherent defects: 1. Inadequate utilization of material properties and poor economic efficiency: Traditional frame beams mainly bear bending loads under earth pressure, and their cross-sectional design is controlled by bending strength. Concrete, as a material with high compressive strength but extremely low tensile strength, is prone to cracking in the tension zone, requiring a large amount of longitudinal reinforcement to resist tensile stress. This results in the material properties not being fully utilized, leading to waste of concrete and steel, and making the structure heavy and expensive.

[0004] 2. Complex stress in the joint area, prone to failure: The stress state at the frame joint is complex, bearing not only the concentrated force of the anchor cables but also the bending moment and shear force from the longitudinal and transverse beams, forming a complex stress concentration zone. Although a large amount of steel reinforcement is usually provided to resist punching and shearing, this area is still a weak link in the structure and is prone to local failure under long-term loads or extreme conditions.

[0005] 3. Low construction efficiency and poor quality control: Existing technology heavily relies on a large amount of wet work such as on-site formwork, rebar tying, and concrete pouring. The construction cycle is long, the labor demand is high, and the construction quality is significantly affected by weather, process, and human factors. In particular, the compactness of concrete pouring and the accuracy of rebar positioning in joint areas are difficult to guarantee, affecting the overall reliability of the structure.

[0006] In recent years, although some technologies have attempted to use prefabricated components to improve construction efficiency, they have failed to fundamentally change the stress mechanism of the structure. Most of them simply replace cast-in-place beams with prefabricated ones, and still have not solved the core problems such as low material utilization and complex stress at joints caused by the bending mechanism.

[0007] The purpose of this invention is to provide a novel slope protection structure system that fundamentally revolutionizes the stress principle of slope protection and significantly improves material utilization and structural efficiency. Summary of the Invention

[0008] Based on the above analysis, embodiments of the present invention aim to provide a prefabricated anti-arch beam slope protection system, comprising: An anti-arch beam, wherein the arch back side of the anti-arch beam faces the slope surface of the slope; An anchoring connector is provided, which is connected to the ends of the plurality of anti-arch beams, and each of the two ends of the anti-arch beam is connected to one of the anchoring connectors. An anchor cable fixing structure is provided, which passes through the corresponding anchoring connector and connects to the slope, so that the overall structure formed by the anti-arch beam and the anchoring connector is fixed on the slope.

[0009] In some embodiments, the anti-arch beam includes a prefabricated anti-arch beam, the prefabricated anti-arch beam comprising: First steel frame; A concrete wrapping layer is provided, which wraps around the first steel frame. The first steel frame has metal connection ends exposed at both ends of the concrete wrapping layer. The metal connection ends are provided with overlapping lining plates, and the surface of the overlapping lining plates is perpendicular to the axis of the first steel frame.

[0010] In some embodiments, the first steel frame is an H-shaped steel frame, the steel grade of the H-shaped steel frame and the overlapping lining plate is not lower than Q235, and the strength grade of the concrete wrapping layer is not lower than C20.

[0011] In some embodiments, the number of overlapping lining plates on the end of a prefabricated anti-arch beam is two.

[0012] In some embodiments, the anchoring connection includes a prefabricated anchoring connection, the prefabricated anchoring connection comprising: Second steel frame; A concrete outer layer, which wraps around the second steel frame, has a groove for accommodating the metal connection end, the end of the second steel frame being exposed in the groove, and the second steel frame being connected to the metal connection end via the overlapping liner.

[0013] In some embodiments, the steel grade of the second steel frame and the overlapping liner is not lower than Q235, and the strength grade of the concrete outer layer is not lower than C20.

[0014] In some embodiments, the anchoring connector has a through-hole, the anchoring hole including a connected anchor cable channel and an anchor block sealing hole, the diameter of the anchor block sealing hole being relatively larger than that of the anchor cable channel.

[0015] In some embodiments, the anchor cable fixing structure includes a prestressed anchor cable, anchor grouting material, and anchor plate; The prestressed anchor cable is anchored in the soil and rock mass of the slope by anchoring grout; The anchor plate is located on the side of the anchoring connector away from the slope, and the anchor plate is located at the bottom of the anchor sealing hole; The end of the prestressed anchor cable away from the slope passes through the anchor cable duct and the anchor plate in sequence, and the portion of the prestressed anchor cable located in the sealing hole of the anchor pier is filled with concrete to form a closed anchor head.

[0016] In some embodiments, the anchoring connector includes a prefabricated anchoring cross beam, which is connected to the anti-arch beam in four directions perpendicular to the axial direction of the anchor cable fixing structure.

[0017] The present invention also provides a construction method for the anti-arch beam slope protection system as described in any of the above embodiments, comprising: Obtain prefabricated anti-arch beams, anchoring connectors, and anchor cable fixing structures; The slope is trimmed and surveyed to determine the designed location of the anchoring connectors. Drill holes and install the prestressed anchor cables of the anchor cable fixing structure, and then perform grouting anchoring. Hoist the anchoring connector so that its anchoring hole is aligned with the prestressed anchor cable; The anti-arch beam is hoisted and its two ends are assembled and connected to the corresponding anchoring connectors using high-strength shear bolts; The prestressed anchor cable is tensioned and locked to the anchoring connector by the anchorage; Concrete was poured to seal the anchor.

[0018] This invention innovatively transforms the traditional straight frame beam into an inverted arch structure, cleverly changing the primary stress mode from bending to compression. This places the concrete material in its optimal compressive working state, overcoming the inherent defect of low tensile strength in concrete. Under the same load-bearing capacity requirements, the beam cross-sectional dimensions and reinforcement amount can be significantly reduced. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0020] Figure 1 This is a three-dimensional schematic diagram of the anti-arch beam slope support system provided in an embodiment of the present invention; Figure 2 This is a side cross-sectional schematic diagram of the anti-arch beam slope support system provided in an embodiment of the present invention; Figure 3This is a partial schematic diagram of the cross-section of a prefabricated inverted arch beam provided in an embodiment of the present invention; Figure 4 This is a three-dimensional schematic diagram of the anchoring connector provided in an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of the support system node assembly provided in an embodiment of the present invention; Figure 6 A schematic diagram of the second steel frame provided in an embodiment of the present invention. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0023] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0024] The working surface of this invention can typically be a plane or a curved surface, and can be inclined or horizontal. For ease of explanation, the embodiments of this invention are placed on a horizontal surface and used on a horizontal surface, thereby defining "height" and "vertical".

[0025] The present invention aims to provide a prefabricated anti-arch beam slope protection system, such as... Figure 1 and Figure 2 As shown, it includes: Anti-arch beam 1, the arch back side 13 of the anti-arch beam 1 faces the slope surface 41 of the slope 4; Anchoring connector 2, which is connected to the ends of each of the plurality of anti-arch beams 1, and each of the two ends of the anti-arch beam 1 is connected to an anchoring connector 2; Anchor cable fixing structure 3 passes through the corresponding anchoring connector 2 and connects to the slope 4, so that the overall structure formed by the anti-arch beam 1 and the anchoring connector 2 is fixed on the slope 4.

[0026] The design of the anti-arch beam slope protection system originates from in-depth analysis and innovative improvement of traditional slope protection structures. Traditional slope protection often uses straight frame beams, such as reinforced concrete lattice beams, whose stress mode is mainly bending. This leads to easy cracking of concrete under tensile force, affecting durability and safety. Concrete, as a material with high compressive strength but low tensile strength (tensile strength is usually only about 1 / 10 of compressive strength), cannot fully utilize its performance advantages under bending conditions, often requiring larger cross-sectional dimensions or increased reinforcement to compensate. This not only increases material consumption and structural weight but also increases construction complexity and cost. This invention introduces an anti-arch structure, changing the beam's stress mode from bending to compression, fully utilizing the compressive properties of concrete to maximize structural efficiency. The arch back of the anti-arch beam faces the slope, forming an "arch effect." Under the action of slope earth pressure, the beam mainly bears axial pressure rather than bending moment, thus significantly reducing stress concentration and deformation risk. This design is inspired by classic structures such as arch bridges and tunnel linings, but its application in the field of slope protection is a first, solving the long-standing problems of low material utilization and construction efficiency.

[0027] Furthermore, the curvature design of the anti-arch beam is precisely calculated, typically employing a circular or parabolic arch to optimize stress distribution. The geometric parameters of the arch (such as arch height, span, and radius of curvature) can be customized based on slope gradient, soil conditions, and load requirements. For example, a high arch design can be used on steep slopes to enhance anti-sliding stability, while a low arch design is used on gentle slopes to save materials. The system also considers the effects of dynamic loads (such as earthquakes or vehicle vibrations), optimizing them through finite element analysis (FEA) and numerical simulations (such as ANSYS or ABAQUS software) to ensure the stability of the anti-arch beam in complex environments. The synergistic effect of the anchoring connectors and anchor cable fixing structure further transfers local pressure to the deep soil and rock mass, forming an integrated anchoring system that effectively suppresses slope slippage and deformation.

[0028] This invention, by designing the traditional straight frame beam as an inverted arch structure, cleverly changes the main stress mode of the beam from bending to compression, putting the concrete material in its optimal compressive working state and overcoming the inherent defect of low tensile strength of concrete.

[0029] Under the same load-bearing capacity requirements, the beam cross-sectional dimensions and reinforcement amount can be significantly reduced. Calculations show that it can save 20%-30% of concrete and 15%-25% of steel, significantly reducing material costs and structural self-weight, resulting in excellent economic efficiency.

[0030] Economy and sustainability are among the core advantages of this invention. By changing the stress pattern, the cross-sectional height and width of the inverted arch beam can be reduced by approximately 20%-40%, depending on the design load and slope conditions. For example, in typical slope engineering, a traditional straight beam might require a cross-sectional size of 400mm × 400mm, while an inverted arch beam only needs 300mm × 300mm to meet the same safety factor (e.g., FS≥1.5). The reduction in reinforcement not only lowers steel consumption but also simplifies the manufacturing process and reduces carbon emissions. According to Life Cycle Assessment (LCA), the system of this invention can reduce the environmental impact index by more than 30% over its entire life cycle (including manufacturing, construction, and maintenance), aligning with green building and sustainable development principles.

[0031] The calculation of material savings is based on numerous engineering examples and theoretical analysis. The reduction in concrete usage is directly related to the consumption of cement, aggregates, and water, while steel savings involve the use of reinforcing bars and structural steel. Taking a 30-meter-high, 100-meter-long slope as an example, traditional support requires approximately 500 cubic meters of concrete and 50 tons of steel, while the system of this invention requires only 350-400 cubic meters of concrete and 37.5-42.5 tons of steel, resulting in a direct cost reduction of 15%-20%. Furthermore, the reduced structural weight decreases the foundation load, making it particularly suitable for slopes in soft soil or high seismic zones, further enhancing its applicability. The system can also utilize industrial waste (such as fly ash or slag) to prepare concrete, improving environmental benefits.

[0032] Furthermore, in some embodiments, the present invention achieves fully prefabricated construction, resulting in a leapfrog improvement in project quality and efficiency. All components (anti-arch beams, anchoring connectors) are prefabricated in the factory in a standardized manner, completely avoiding a large amount of wet work such as on-site formwork, rebar tying, pouring and curing, and solving the industry problems of large quality fluctuations and many human factors in traditional processes.

[0033] On-site operations only require mechanical steps such as hoisting, positioning, bolt tightening, and tensioning. The construction speed is more than 50% faster than traditional cast-in-place processes, greatly shortening the construction period and reducing disturbance to the slope environment. It is particularly suitable for emergency rescue projects and projects with short construction windows.

[0034] Fully prefabricated construction is another major innovation of this invention, revolutionizing the traditional on-site casting method for slope protection. Factory prefabrication utilizes automated production lines, including CNC cutting, robotic welding, and standardized molds, ensuring component dimensional accuracy within ±2mm and a strength variation coefficient of less than 5%. During prefabrication, the concrete mix design, pouring, and curing are all strictly controlled, for example, using steam curing or high-temperature curing to enhance early strength and avoid the influence of the on-site environment (such as temperature and humidity). Quality inspection includes ultrasonic testing, load testing, and durability testing to ensure that each component meets design standards.

[0035] Prefabricated construction not only improves efficiency but also reduces on-site operational risks and environmental impact. Traditional cast-in-place processes require a large amount of formwork, scaffolding, and temporary supports, generating noise, dust, and wastewater. This invention, however, requires only small hoisting equipment (such as truck cranes or crawler cranes) and a small number of workers, reducing the construction cycle from weeks to days. For example, in a highway slope emergency repair project, traditional methods would take 30 days to complete, while this invention's system only takes 10-15 days, reducing traffic interruption time by more than 50%. Mechanization of construction steps reduces human error, and virtual simulation and schedule management through BIM (Building Information Modeling) technology further optimize resource allocation. Furthermore, prefabricated design allows for modular expansion, enabling the system to easily adapt to changes in slope shape or subsequent reinforcement needs.

[0036] Specifically, in some embodiments, the anti-arch beam 1 includes a prefabricated anti-arch beam, such as... Figure 3 As shown, the precast inverted arch beam includes: First steel frame 11; A concrete wrapping layer 12 is wrapped around the first steel frame 11, and the two ends of the first steel frame 11 have metal connection ends 14 exposed outside the concrete wrapping layer 12. The metal connection end 14 is provided with an overlapping liner 15, and the surface of the overlapping liner 15 is perpendicular to the axis of the first steel frame 11.

[0037] The manufacturing process of the precast inverted arch beam embodies high precision and high efficiency. The first steel frame 11 is typically made of high-strength steel, and its design takes into account the geometric characteristics of the inverted arch. In the factory, the steel frame is cut and welded using CNC machine tools to ensure dimensional accuracy and weld quality. The lap lining plates are connected to the metal connection ends 14 at the ends of the steel frame using bevel welding or bolting, and non-destructive testing (such as magnetic particle or radiographic testing) is performed to ensure integrity. The concrete cladding layer 12 is poured using self-compacting concrete (SCC) or ultra-high performance concrete (UHPC), filling the mold using a vibrating table or pumping equipment to form a dense structure. The thickness of the cladding layer is designed according to protection requirements and durability, typically 50-100 mm, covering the steel frame to provide corrosion and fire protection.

[0038] The ends of the anti-arch beam are designed with metal connections for easy and quick assembly with anchoring components. The lap plate 15 is perpendicular to the beam axis to ensure direct force transmission. The bolt holes on the lap plate are CNC drilled with a positional error of less than 1 mm to ensure smooth on-site assembly. Furthermore, the beam surface can be coated with an anti-corrosion coating (such as epoxy resin or zinc-aluminum coating) or equipped with drainage holes to enhance environmental adaptability. In special applications, the anti-arch beam can be designed with a variable cross-section or be reinforced, for example, by adding stiffening ribs at mid-span to handle uneven loads.

[0039] In some embodiments, the first steel frame 11 is an H-shaped steel frame, the steel grade of the H-shaped steel frame and the overlapping lining plate 15 is not lower than Q235, and the strength grade of the concrete wrapping layer is not lower than C20.

[0040] The H-beam frame is chosen based on its excellent compressive and bending stiffness. Because this invention utilizes a shift in the stress mode, the relatively lower-strength Q235 steel can be used to meet the basic requirements. In some embodiments, Q355 steel can be used, which has a yield strength of 355 MPa and a tensile strength of 470-630 MPa, significantly higher than ordinary Q235 steel, making it suitable for high-stress environments. The flange and web design of the H-beam provides a larger moment of inertia, effectively resisting local buckling. The lap joint liner 15 also uses Q235 or higher grade steel (such as Q355, Q460) to ensure connection strength.

[0041] C20 concrete is a commonly used and technically mature strength grade in construction engineering, with a standard value of 20 MPa for its cubic compressive strength. The selection of concrete with a strength grade no lower than C20 in this invention is based on a comprehensive consideration of technical reliability, economy, and engineering applicability: 1) Meeting stress requirements: Through structural calculations, under a reasonable cross-sectional design, C20 concrete can provide sufficient compressive strength and necessary bending capacity for the inverted arch beam to withstand the earth pressure transmitted from the slope. Working in conjunction with steel reinforcement of at least Q355 grade, it can achieve safe load-bearing performance. 2) Excellent economy and availability: The raw materials for C20 concrete (cement, sand, and stone) are widely available, and the mix design, production, and construction processes are extremely mature. Its cost is significantly lower than high-strength concrete, which helps reduce project costs and promotes the large-scale application of this technology in various slope engineering projects. 3) Good workability and construction assurance: C20 concrete has good fluidity and plasticity, facilitating the casting and vibration of anti-arch beam components in the prefabrication plant, ensuring the internal density and accurate shape of the components. Simultaneously, it also facilitates the casting of beam-pier connection joints on-site, ensuring full filling of concrete in multi-sleeve and densely reinforced areas, achieving an effective combination of prefabricated and cast-in-place components. 4) Sufficient durability: With reasonable mix design (such as controlling the water-cement ratio) and appropriate structural measures (such as ensuring the thickness of the protective layer), C20 concrete can meet the durability requirements of general field slope engineering. The requirement that the concrete strength grade of both the first outer layer (prefabricated) and the second outer layer (cast-in-place) be "not lower than C20" is crucial. The core purpose is to ensure a balanced match in material properties between the prefabricated components and the cast-in-place joints, avoiding stress concentration or weak points due to excessive strength differences, thereby ensuring the integrity and reliability of the entire support connection structure in terms of coordinated stress distribution. In actual engineering projects, C25, C30 or higher grade concrete can be selected according to the specific design load and environmental conditions, but C20 constitutes a reliable and economical basic threshold.

[0042] The selection of materials undergoes rigorous calculations; for example, the stability of the steel frame is verified using Euler's formula, or the compressive strength of the concrete is assessed using the Mohr-Coulomb criterion. In corrosive environments, weather-resistant steel or composite coatings can be used for the steel, and silica fume or water-reducing agents can be incorporated into the concrete to improve its density. These measures ensure that the system can serve for more than 50 years in harsh conditions, such as coastal areas or industrial zones.

[0043] In some embodiments, the number of overlapping lining plates on the end of a precast anti-arch beam is two, i.e., a double shear connection is adopted.

[0044] Double shear connection is a highly efficient shear-resistant design that distributes shear force through two parallel lap plates, reducing the load on a single bolt. This connection method is based on the principle of friction-type high-strength bolts, where the bolt preload generates clamping force, and the shear force is transferred using the friction between the plates. The shear capacity of a double shear connection can be 50%-100% higher than that of a single shear connection, depending on the number and diameter of the bolts. For example, using M24 high-strength bolts (performance grade 10.9), the shear design value of a single bolt can reach over 100kN. In a double shear arrangement, each connection point can withstand a shear force of 200-400kN, meeting the load requirements of most slopes.

[0045] The thickness and dimensions of the connecting plate are optimized through finite element analysis, typically with a thickness of 20-30mm and a width matching the H-beam flange. The bolt hole arrangement employs a symmetrical pattern to eliminate eccentric bending moments. During on-site assembly, a torque wrench or hydraulic tensioner is used to apply preload, ensuring the bolt tension reaches the design value (e.g., 225kN preload for M24 bolts). The double shear connection also provides redundant safety; even if one bolt fails, the overall connection remains functional, conforming to the "tough design" principle.

[0046] In some embodiments, the anchoring connector 2 includes a prefabricated anchoring connector, such as... Figure 4 As shown, the prefabricated anchoring connector includes: Second steel frame 21; A concrete outer layer 22, which wraps around the second steel frame 21, has a groove 23 for accommodating the metal connecting end 14. The end of the second steel frame 21 is exposed in the groove 23, and the second steel frame 21 is connected to the metal connecting end 14 via the overlapping liner 15. Figure 5 As shown, when the prefabricated anchoring connector and the prefabricated inverted arch beam are assembled together, the connection points of the metal connecting end 14 and the overlapping liner 15 with the second steel frame 21 are located in the groove 23. The size of the groove 23 matches the metal connecting end 14 of the H-shaped steel frame, and after connection, the surface of the metal connecting end 14 is flush with or slightly lower than the end face of the prefabricated anchoring cross beam. Corresponding bolt holes are provided on the metal connecting end 14, the overlapping liner 15, and the second steel frame 21, and the number of high-strength shear bolts is not less than two, and the high-strength shear bolts are not less than M24. Preferably, as shown... Figure 5 As shown, after the metal connection end 14 and the second steel frame 21 are connected, a concrete seal layer is injected into the remaining gaps in the groove 23.

[0047] Precast anchoring connectors, as key nodes in the system, play a crucial role in force transmission and distribution. The second steel frame 21 adopts a lattice design to enhance torsional and shear resistance. The grooves 23 of the outer concrete layer 22 are designed to be rectangular or trapezoidal, with a depth slightly greater than the thickness of the metal connection end 14, to ensure a flush surface after assembly and avoid stress concentration. The lapped liner 15 is connected to the first steel frame 11 by welding or bolting, and the surface of the liner is ground smooth to provide a uniform contact surface. The bolt holes are reamed or precision-machined holes to ensure a tight fit between the bolts and the hole walls, reducing the risk of loosening.

[0048] The manufacturing process of the anchoring connectors emphasizes precision and strength. After the steel frame is prefabricated in the factory, it is placed in a custom mold, concrete is poured, and vibrated to compact it. Temperature control measures are employed during the curing stage to prevent cracking. The groove positions are laser-positioned, with an error controlled within ±1mm. During connection, high-strength shear bolts (such as M24 or M30) apply preload, creating friction between the lap plate and the lining plate to transfer axial and shear forces. This design not only improves connection stiffness but also allows for minor adjustments to accommodate uneven slope settlement.

[0049] In some embodiments, the steel grade of the second steel frame 21 and the overlapping liner 15 is not lower than Q23, and the strength grade of the concrete outer layer 22 is not lower than C20. This invention allows for the convenient fabrication of precast components using ultra-high performance concrete (UHPC), whose dense microstructure endows the support system with excellent impermeability, frost resistance, and corrosion resistance, effectively resisting erosion from groundwater, rainwater runoff, and freeze-thaw cycles.

[0050] The application of UHPC is a major highlight of this invention. Its composition includes cement, quartz sand, silica fume, high-efficiency water-reducing agent, and steel fiber, with a water-cement ratio below 0.20, forming a nanoscale dense structure. The compressive strength can reach 120-150 MPa, the flexural strength exceeds 30 MPa, and durability indicators such as the chloride ion diffusion coefficient are below 1.0 × 10⁻⁶. - ¹² m² / s, with a freeze-thaw resistance rating of F300 or higher. The microstructure of UHPC was verified by X-ray diffraction (XRD) and scanning electron microscopy (SEM), showing extremely low porosity, thus significantly improving impermeability (permeability coefficient less than 10). - ¹ 0 (m / s) and resistance to chemical corrosion.

[0051] In corrosive environments, UHPC can replace traditional concrete, extending maintenance cycles. For example, in acid rain areas, UHPC's acid resistance is more than five times higher than that of ordinary concrete. The Q355 steel used in the steel frame and overlapping lining plates, combined with UHPC, forms a composite protective system, which, verified by electrochemical tests (such as polarization curves), reduces the corrosion rate by more than 50%. Furthermore, UHPC's high toughness allows components to maintain their integrity under impact loads (such as falling rocks), reducing the risk of brittle fracture.

[0052] This embodiment offers various modular node connection schemes, including end-plate and side-plate double-shear types, ensuring a clear and reliable force transmission path. All nodes are connected using high-strength bolts, guaranteeing node stiffness and structural integrity. The node strength can be calculated and analyzed, with ample safety reserves. Its seismic and fatigue resistance performance is superior to cast-in-place nodes, providing long-term stable support for slopes.

[0053] Modular node design enhances the system's adaptability and scalability. Endplate connections are suitable for straight beam ends, while double-shear sideplates are used for anti-arch beams, providing multi-directional force transmission paths. Force transmission paths are verified through truss models or finite element analysis, ensuring that forces travel from the beam through connectors to anchor cables and ultimately into the soil, avoiding stress concentration. Node stiffness is tested experimentally, such as through cyclic loading tests, showing a stiffness coefficient 20%-30% higher than that of cast-in-place nodes.

[0054] The seismic performance is based on the ductile design principle, allowing for slight deformation of the joints under seismic loads to absorb energy and prevent sudden failure. Fatigue resistance is verified through accelerated life testing; under 2 million cycles of loading (simulating wind, rain, or traffic vibration), the joint strength decays by less than 5%, far lower than the 15%-20% of cast-in-place joints. A safety margin factor is typically taken as 1.5-2.0, based on reliability theory (such as the first-order second-moment method), ensuring the system remains functional under extreme events (such as earthquakes or floods).

[0055] Preferably, in some embodiments, the anchoring connector includes a prefabricated anchoring cross beam connected to the anti-arch beam in four directions perpendicular to the axial direction of the anchor cable fixing structure. For example... Figure 6 As shown, the second steel frame 21 is an H-shaped steel structure in all four horizontal directions. Therefore, the prefabricated anchoring connector is also an anchoring cross beam.

[0056] In some embodiments, such as Figure 5 As shown, the anchoring connector 2 has an anchoring hole 24 extending through it. The anchoring hole 24 includes an anchor cable channel 241 and an anchor block sealing hole 242 connected to each other. The diameter of the anchor block sealing hole 242 is relatively larger than that of the anchor cable channel 241. The anchor block sealing hole 242 is a cylindrical hole with a diameter larger than that of the anchor cable channel 241, so as to provide installation space and sufficient bearing surface for the anchor.

[0057] In some embodiments, the anchor cable fixing structure includes a prestressed anchor cable 31, an anchoring grout 32, and an anchor plate 33; The prestressed anchor cable 31 is anchored in the rock and soil of the slope by anchoring grout 32; The anchor plate 33 is located on the side of the anchoring connector away from the slope. The anchor plate 33 is located at the bottom of the anchor sealing hole 242. The anchor plate 33 can be a circular anchor plate or a square anchor plate. The end of the prestressed anchor cable away from the slope passes through the anchor cable duct 241 and the anchor plate 33 in sequence, and the portion of the prestressed anchor cable located in the sealing hole of the anchor pier is filled with concrete to form a closed anchor head.

[0058] The present invention also provides a construction method for the anti-arch beam slope protection system as described in any of the above embodiments, comprising: S1: Obtain the prefabricated anti-arch beam, anchoring connectors, and anchor cable fixing structure; S2: Perform slope trimming and surveying, and locate the designed position of the anchoring connector; S3: Drill holes and install the prestressed anchor cables of the anchor cable fixing structure, and perform grouting anchoring; S4: Hoist the anchoring connector so that its anchoring hole is aligned with the prestressed anchor cable; S5: Hoist the anti-arch beam and assemble and connect its two ends to the corresponding anchoring connectors using high-strength shear bolts; S6: Tension the prestressed anchor cable and lock it to the anchoring connector using an anchor. S7: Pour concrete to seal the anchor.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fabricated inverted arch beam slope support system, characterized by, include: An anti-arch beam, wherein the arch back side of the anti-arch beam faces the slope surface of the slope; An anchoring connector is provided, which is connected to the ends of the plurality of anti-arch beams, and each of the two ends of the anti-arch beam is connected to one of the anchoring connectors. An anchor cable fixing structure is provided, which passes through the corresponding anchoring connector and connects to the slope, so that the overall structure formed by the anti-arch beam and the anchoring connector is fixed on the slope.

2. The precast inverted-arch beam slope support system according to claim 1, wherein: The anti-arch beam includes a precast anti-arch beam, which comprises: First steel frame; A concrete wrapping layer is provided, which wraps around the first steel frame. The first steel frame has metal connection ends exposed at both ends of the concrete wrapping layer. The metal connection ends are provided with overlapping lining plates, and the surface of the overlapping lining plates is perpendicular to the axis of the first steel frame.

3. The precast inverted-arch beam slope support system according to claim 2, characterized in that: The first steel frame adopts an H-shaped steel frame, and the steel grade of the H-shaped steel frame and the overlapping lining plate is not lower than Q235, and the strength grade of the concrete wrapping layer is not lower than C20.

4. The precast inverted-arch beam slope support system according to claim 2, wherein: The number of overlapping lining plates on the end of a precast inverted arch beam is two.

5. The precast inverted-arch beam slope support system according to claim 2, wherein: The anchoring connector includes a prefabricated anchoring connector, which comprises: Second steel frame; A concrete outer layer, which wraps around the second steel frame, has a groove for accommodating the metal connection end, the end of the second steel frame being exposed in the groove, and the second steel frame being connected to the metal connection end via the overlapping liner.

6. The precast inverted-arch beam slope support system according to claim 5, wherein: The steel grade of the second steel frame and the overlapping lining plate is not lower than Q235, and the strength grade of the concrete outer layer is not lower than C20.

7. The precast inverted-arch beam slope protection system of claim 1, wherein: The anchoring connector has a through-hole, which includes a connected anchor cable channel and an anchor block sealing hole. The diameter of the anchor block sealing hole is relatively larger than that of the anchor cable channel.

8. The precast inverted-arch beam slope protection system of claim 7, wherein: The anchor cable fixing structure includes prestressed anchor cables, anchor grouting material, and anchor plates; The prestressed anchor cable is anchored in the soil and rock mass of the slope by anchoring grout; The anchor plate is located on the side of the anchoring connector away from the slope, and the anchor plate is located at the bottom of the anchor sealing hole; The end of the prestressed anchor cable away from the slope passes through the anchor cable duct and the anchor plate in sequence, and the portion of the prestressed anchor cable located in the sealing hole of the anchor pier is filled with concrete to form a closed anchor head.

9. The precast inverted-arch beam slope protection system of claim 1, wherein: The anchoring connector includes a prefabricated anchoring cross beam, which is connected to the anti-arch beam in four directions perpendicular to the axial direction of the anchor cable fixing structure.

10. A method of constructing the assembled inverted arch beam slope support system according to any one of claims 1-9, characterized in that, include: Obtain prefabricated anti-arch beams, anchoring connectors, and anchor cable fixing structures; The slope is trimmed and surveyed to determine the designed location of the anchoring connectors. Drill holes and install the prestressed anchor cables of the anchor cable fixing structure, and then perform grouting anchoring. Hoist the anchoring connector so that its anchoring hole is aligned with the prestressed anchor cable; The anti-arch beam is hoisted and its two ends are assembled and connected to the corresponding anchoring connectors using high-strength shear bolts; The prestressed anchor cable is tensioned and locked to the anchoring connector by the anchorage; Concrete was poured to seal the anchor.

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