Modular road guardrail

Abstract

The invention relates to a modular road guardrail, and relates to the technical field of road protection, the modular road guardrail comprises a vertically arranged guard plate and two stand columns fixedly arranged on one side of the guard plate in the vertical direction, adjusting rods capable of being adjusted up and down are coaxially arranged on the top surfaces of the stand columns in a sliding mode, and an extension plate located above the guard plate is jointly and fixedly arranged on the peripheries of the two adjusting rods; the extension plate can move downwards along with the adjusting rod to be in a transportation state of abutting against the protection plate and can move upwards along with the adjusting rod to be in an application state of having a distance with the protection plate, and a limiting piece for fixing the transportation and application states of the adjusting rod is arranged outside the stand column. In the application, the guardrail does not need to be integrally dismantled and replaced when being additionally paved and maintained on a road surface, and the overall effective protection height of the guardrail can be quickly adjusted only by driving the extension plate to move up and down through the adjusting rod, so that the guardrail is matched with the elevation of a new road surface, and the current safety protection specification requirements are met.

Description

Technical Field

[0001] This application relates to the technical field of road protection, and in particular to a modular road guardrail. Background Technology

[0002] In municipal roads, highways, and cement / concrete pavement projects, road fencing is an important protective facility for ensuring traffic safety and separating traffic areas. Traditional road fencing mostly adopts a fixed installation structure, mainly consisting of a vertical guard plate and multiple posts arranged at intervals along the vertical direction. The bottom of the posts is usually welded or bolted to a horizontal support plate, and multiple through holes are reserved on the support plate. During installation, the bottom surface of the support plate is tightly attached to the cement or concrete base surface, and expansion bolts are passed through the through holes and anchored into the pre-set holes to achieve a rigid connection between the fence and the ground. Due to its simple installation and good stability, this structure is widely used in existing road projects and has become a standard configuration of road protection systems.

[0003] During the long-term operation of municipal roads and highways, road surfaces are prone to defects such as cracks, subsidence, and rutting. To restore road surface performance and improve driving comfort, overlaying a new asphalt layer on the existing road structure is a common and efficient maintenance method in the industry. This process can quickly improve road surface smoothness and structural strength without extensively damaging the original road surface and is widely used in periodic major and medium-sized maintenance projects. After the overlay construction is completed, the overall road surface elevation will be raised accordingly. However, the road barriers that have already been installed will maintain their original installation height, and their effective protection height relative to the road surface will be passively reduced as the road surface is raised, making it difficult to continue to meet current specifications and safety protection requirements.

[0004] The traditional approach to addressing the issue of insufficient effective protective height of road fencing after road overlay is to completely remove the existing fencing and purchase and install a new, complete fencing system that matches the new road surface elevation. This approach has significant drawbacks: firstly, a large number of still functional fencing posts, panels, and other components are forcibly discarded, resulting in high costs for both new component procurement and old component disposal, leading to substantial resource waste; secondly, the complete removal and reinstallation process is cumbersome, time-consuming, and requires prolonged occupancy of existing lanes, significantly disrupting normal traffic flow and causing congestion. This results in poor construction efficiency and economy, failing to meet the practical needs of modern rapid road maintenance and indicating room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a modular road guardrail to solve the problems of insufficient guardrail height after road surface overlay in the above-mentioned related technologies, and the high cost, low efficiency, large traffic interference and waste of resources of the traditional whole replacement method.

[0006] The modular road guardrail provided in this application adopts the following technical solution: A modular road guardrail includes a vertically arranged guard plate and two posts fixed to one side of the guard plate in a vertical direction. An adjustable rod that can be adjusted up and down is slidably provided on the top surface of the posts. An extension plate located above the guard plate is fixed together on the outer periphery of the two adjustable rods. The extension plate can move down with the adjustable rod to a transport state where it abuts against the guard plate, and can move up with the adjustable rod to an application state where there is a gap between it and the guard plate. The outside of the posts is provided with a limiting member to fix the adjustable rod in the transport and application states.

[0007] By adopting the above technical solution, the guardrail does not need to be completely removed and replaced during road overlay maintenance. Simply adjusting the extension plate with an adjusting rod allows for rapid adjustment of the overall effective protective height of the guardrail, ensuring it matches the new road surface elevation and meets current safety protection standards. The extension plate can be stowed away in a transport configuration that fits snugly against the guardrail, significantly reducing transport volume and improving space utilization. During application, it can be raised to a set height, achieving flexible and adjustable protective height. This structure eliminates traditional disassembly and replacement procedures, reduces material waste and construction costs, shortens road occupancy time, minimizes traffic disruption, and significantly improves the economic efficiency and construction efficiency of road maintenance, meeting the needs of modern rapid road maintenance.

[0008] Optionally, the limiting component includes a limiting rod coaxially fixed to the upper end face of the column and a limiting pin disposed outside the adjusting rod. The lower end face of the adjusting rod is provided with an adjusting through hole for the limiting rod to be inserted, and the outer periphery is provided with a clearance through hole communicating with the adjusting through hole. The upper end of the limiting rod is provided with a clearance slot that can coincide with the clearance through hole. The limiting pin can pass through the corresponding clearance through hole and be inserted into the clearance slot.

[0009] By adopting the above technical solution, the extension plate height is continuously adjustable through the sliding engagement of the limiting rod and the adjusting through hole. Combined with the locking mechanism of the limiting pin, the clearance through hole, and the clearance slot, the adjusting rod and the post can be quickly fixed at the transportation or application height. The structure is simple, reliable, and easy to operate. The through-type insertion of the limiting pin ensures uniform stress distribution and high locking strength, capable of withstanding vehicle impacts and long-term wind loads, guaranteeing the stability and reliability of the guardrail under various working conditions. It also facilitates quick on-site assembly and disassembly and height adjustment, improving construction and maintenance efficiency.

[0010] Optionally, an installation notch is provided on the top surface of the guard plate near the edge of the column. A connecting rod is rotatably installed on the left and right bottom walls of the installation notch. An elastic snap-fit ​​is provided on the bottom wall of the installation notch. Two elastic fixing rods with elastic elongation properties are rotatably connected to the end face of the connecting rod away from the guard plate. The rotation surfaces of the connecting rod and the elastic fixing rod are parallel to the top surface of the guard plate. A fixing block and a fixing slot are fixed on the end face of the elastic fixing rod away from the connecting rod. When the extension plate is in the transport state, the connecting rod can rotate to a retracted state that is parallel to the guard plate and within the installation notch. The two elastic fixing rods on the same connecting rod rotate to a parallel side-by-side state. When the extension plate is in the application state, the connecting rod can rotate to an unfolded state that is perpendicular to the guard plate and is limited by the elastic snap-fit. The two elastic fixing rods on the same connecting rod can rotate to a coaxial state with opposite directions. The fixing block on one of the two adjacent elastic fixing rods is inserted into the fixing slot on the other.

[0011] By adopting the above technical solution, the connecting rod and the flexible fixing rod can be stored in the installation notch during transportation, without occupying extra space, facilitating overall transport; during application, they can be unfolded and inserted into adjacent guardrails to achieve modular connection between multiple guardrail sections, improving overall continuity and anti-overturning capability. The flexible fixing rod has elastic elongation performance, which can adapt to the installation errors of adjacent guardrails, and can achieve quick docking through fixing blocks and fixing slots, improving modular assembly efficiency and overall structural stability, and enhancing the overall protective performance of the guardrail.

[0012] Optionally, the elastic snap-fit ​​component includes a compression spring and a positioning block. The bottom wall of the mounting notch is provided with a placement groove for inserting the compression spring and the positioning block. When the two connecting rods are rotated to the unfolded state, the compression spring presses one side of the positioning block, causing the top of the positioning block to protrude from the opening of the placement groove. At this time, the sides of the two connecting rods that are close to each other abut against one side of the positioning block.

[0013] By adopting the above technical solution, when the connecting rod rotates to the unfolded state, the positioning block automatically protrudes under the action of the compression spring and limits the connecting rod, achieving unfolding and positioning without the need for additional fasteners. The structure is simple and the operation is reliable. When storing, the positioning block can be manually pressed to release the limit, making the operation convenient and quick. This effectively prevents the connecting rod from rotating accidentally during use, ensuring the stability of the connection structure and improving the overall safety and reliability of the guardrail.

[0014] Optionally, the guard plate has an upward-opening collection bag on the side facing the column. An elastic locking rod with elastic shortening performance is rotatably connected to the top surface of the connecting rod. A locking plate is detachably installed on the end face of the elastic locking rod away from the connecting rod. A first insert block and a first slot are fixed on the side of the locking plate facing the elastic locking rod. When the two elastic fixing rods on the same connecting rod are rotated to the extended state, they are rotated to a side-by-side state. At this time, the elastic locking rod is rotated downward to a horizontal state parallel to the elastic fixing rod. The fixing insert block is inserted into the first slot. The two sides of the opening of the collection bag are inserted into and fixed to the gap between the elastic fixing rod and the elastic locking rod.

[0015] By adopting the above technical solution, during road and ancillary facility maintenance, the elastic locking rod can be unfolded and cooperate with the elastic fixing rod to form a clamping structure, fixing the opening of the collection bag. This facilitates the collection of gravel, garbage, and other debris generated during maintenance, keeping the road surface and guardrail area clean and reducing subsequent cleaning workload. This structure is integrated into the guardrail body, eliminating the need for additional tools or storage devices, making it flexible and convenient to use, and improving the standardization of maintenance operations and the level of civilized construction on site.

[0016] Optionally, a first inclined surface is provided at the outer edge of the first insert block, and a second inclined surface is provided at the opening edge of the first slot.

[0017] By adopting the above technical solution, the first inclined surface and the second inclined surface play a guiding role. When the fixed plug and the first slot are connected, the centering and correction can be automatically performed, reducing the accuracy requirements of the plug-in fit. This makes it easier for workers to complete the plug-in installation quickly and smoothly, effectively avoiding problems such as jamming and misalignment, improving the efficiency of assembly and disassembly, and making the plug-in fit tighter, thus improving the stability of the structural connection.

[0018] Optionally, a second slot is provided on the top surface of the outer end of the limiting pin; when the two connecting rods are rotated to the unfolded state and the two elastic fixing rods are rotated to the coaxial state, the elastic locking rod rotates to the vertically upward limiting state, the locking plate rotates to the locking state that abuts against the top surface of the limiting pin, and the first insert block is then inserted into the second slot.

[0019] By adopting the above technical solution, under normal use, the elastic locking rod drives the locking plate to lock the limit pin a second time, preventing the limit pin from accidentally loosening due to vibration, impact, or other reasons, thus further improving the locking reliability of the height adjustment mechanism. This structure links the connecting mechanism with the height limiting mechanism, forming multiple safety guarantees and enhancing the safety and structural stability of the guardrail under complex traffic conditions.

[0020] Optionally, the extension plate has a accommodating notch in the vertical direction facing the adjusting rod and a third slot on its top surface; when the two connecting rods are rotated to the retracted state and the two elastic fixing rods are rotated to the parallel state, the elastic locking rod is rotated to the limiting state within the accommodating notch, the locking plate is rotated to the state of abutting against the top surface of the extension plate, and the first insert is inserted into the third slot at this time.

[0021] By adopting the above technical solution, in the transport and storage state, the elastic locking rod can be stored in the receiving notch, the locking plate and the top surface of the extension plate are attached, and it is fixed by the first insert and the third slot, which prevents the elastic locking rod from shaking or protruding, reduces the overall packaging volume, and improves transport safety and space utilization. At the same time, it enhances the overall connection between the extension plate and the protective plate in the transport state and reduces component collision damage during transportation.

[0022] Optionally, a third bevel is provided at the opening edge of the third slot.

[0023] By adopting the above technical solution, the third inclined surface plays a guiding role when the locking plate and the top surface of the extension plate are engaged, which facilitates the smooth insertion of the first insert into the third slot, reduces the difficulty of alignment, improves the efficiency of storage operation, makes the insertion process smoother, avoids damage to components due to jamming, and ensures proper engagement, thereby improving the structural stability in the stored state.

[0024] Optionally, a fourth inclined surface is provided at the opening edge of the receiving notch.

[0025] By adopting the above technical solution, the fourth inclined surface plays a guiding role when the elastic locking rod is turned into the receiving notch, which facilitates the smooth entry of the elastic locking rod into the storage position, reduces interference and jamming, makes the storage action smoother, reduces the difficulty of operation, and at the same time protects the surface of the component and improves the durability and ease of operation.

[0026] In summary, this application includes the following beneficial technical effects: In this application, the guardrail does not need to be completely removed and replaced during road overlay maintenance. The overall effective protection height of the guardrail can be quickly adjusted by simply moving the extension plate up and down with the adjusting rod, so as to match the new road surface elevation and meet the requirements of the current safety protection specifications. The extension panel can be stowed away to fit snugly against the guardrail during transport, significantly reducing transport volume and improving space utilization. During application, it can be raised to a set height, allowing for flexible adjustment of the protective height. This structure eliminates traditional disassembly and replacement procedures, reduces material waste and construction costs, shortens road occupancy time, minimizes traffic disruption, and significantly improves the economic efficiency and construction effectiveness of road maintenance, meeting the demands of modern rapid road maintenance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the installation and assembly of the support components in an embodiment of this application; Figure 3 This is a partial cross-sectional view of the installation and fit of the limiting component in an embodiment of this application; Figure 4 This is a partial structural diagram illustrating the installation and cooperation of the connecting rod and the elastic fixing rod in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the installation and assembly of the fixed components in an embodiment of this application; Figure 6 This is a cross-sectional structural diagram illustrating the installation and cooperation of the connecting rod and the elastic fixing rod in an embodiment of this application; Figure 7 This is a partial cross-sectional view of the installation and fit of the elastic fixing rod in an embodiment of this application; Figure 8 This is a partial cross-sectional view of the installation and fit of the flexible snap-fit ​​component according to an embodiment of this application; Figure 9 This is a schematic diagram illustrating the installation and assembly of the collection bag in an embodiment of this application; Figure 10 This is a partial cross-sectional view of the assembly of the collection bag according to an embodiment of this application; Figure 11 This is a partial structural diagram illustrating the installation and cooperation of the elastic locking rod and the locking plate in an embodiment of this application; Figure 12 This is a partial cross-sectional view of an embodiment of the present application illustrating the installation and cooperation of the limiting pin and the locking plate; Figure 13 This is a partial cross-sectional view of an embodiment of the present application illustrating the installation and cooperation of the elastic locking rod and the locking plate; Figure 14 yes Figure 13 An enlarged schematic diagram of part A in the middle.

[0028] In the diagram, 1. Protective plate; 11. Installation notch; 12. Placement slot; 13. Elastic snap-fit ​​component; 131. Positioning block; 132. Compression spring; 2. Extension plate; 21. Accommodation notch; 211. Fourth inclined surface; 22. Third slot; 221. Third inclined surface; 3. Support assembly; 31. Column; 32. Adjusting rod; 321. Adjustment through hole; 322. Clearance through hole; 4. Limiting component; 41. Limiting rod; 411. Clearance slot; 42. Limiting pin; 421. Second slot; 5. Fixing assembly; 51. Connecting rod; 52. Elastic fixing rod; 521. Fixing insert; 522. Fixing slot; 53. Elastic locking rod; 54. Locking plate; 541. First insert; 5411. First inclined surface; 542. First slot; 5421. Second inclined surface; 6. Collection bag. Detailed Implementation

[0029] The present application will be further described in detail below with reference to all the accompanying drawings. Example

[0030] Reference Figure 1 and Figure 2 A modular road guardrail includes a vertically arranged guard plate 1 and a support assembly 3 located on one side of a post 31. The support assembly 3 includes two posts 31 fixed vertically on one side of the guard plate 1. An adjusting rod 32 that can be adjusted up and down is slidably provided on the top surface of the post 31. An extension plate 2 located above the guard plate 1 is fixed on the outer periphery of the two adjusting rods 32. A limiting member 4 is provided on the outside of the post 31.

[0031] During the transportation of the road guardrail, the staff can move the extension plate 2 down with the adjusting rod 32 to a position where it abuts against the guardrail 1 and fix it with the limiting member 4, thereby improving the space utilization during transportation. When the road guardrail is installed and applied, the staff can move the extension plate 2 up with the adjusting rod 32 to an application state where there is a gap between it and the guardrail 1, and fix it with the limiting member 4, according to actual needs.

[0032] Reference Figure 2 and Figure 3 The limiting component 4 includes a limiting rod 41 coaxially fixed to the upper end face of the column 31 and a limiting pin 42 provided outside the adjusting rod 32. The lower end face of the adjusting rod 32 is provided with an adjusting through hole 321 for the limiting rod 41 to be inserted, and a clearance through hole 322 communicating with the adjusting through hole 321 is provided on the outer periphery. The upper end of the limiting rod 41 is provided with a clearance slot 411 that can coincide with the clearance through hole 322. When adjusting and locking the overall height of the adjusting rod 32 and the column 31 using the limiting member 4, the depth of the limiting rod 41 inserted into the adjusting through hole 321 is adjusted, and then the limiting pin 42 is inserted into the corresponding clearance through hole 322 and then inserted into the clearance slot 411.

[0033] Reference Figure 4 , Figure 5 , Figure 6 and Figure 7 An installation notch 11 is provided on the top surface of the guard plate 1 near the edge of the column 31, and a fixing component 5 is provided within the installation notch 11. The fixing component 5 includes a connecting rod 51 rotatably connected to the left and right bottom walls of the installation notch 11 at one end. An elastic snap-fit ​​member 13 is provided on the bottom wall of the installation notch 11. Two elastic fixing rods 52 with elastic elongation properties are rotatably connected to the end face of the connecting rod 51 away from the guard plate 1. The rotation surfaces of the connecting rod 51 and the elastic fixing rods 52 are parallel to the top surface of the guard plate 1. A fixing insert 521 and a fixing slot 522 are fixed on the end face of the elastic fixing rod 52 away from the connecting rod 51. When the extension plate 2 is in the transport state (i.e., road guardrail transport), the connecting rod 51 rotates to a retracted state that is parallel to the guard plate 1 and within the installation notch 11, and the two elastic fixing rods 52 on the same connecting rod 51 rotate to a parallel side-by-side state. When the extension plate 2 is in the application state (i.e., road guardrail installation application), the connecting rod 51 rotates to the unfolded state perpendicular to the guard plate 1 and is limited by the elastic snap-fit ​​13. The two elastic fixing rods 52 on the same connecting rod 51 rotate to the coaxial state in opposite directions. The fixing block 521 on one of the two adjacent elastic fixing rods 52 is inserted into the fixing slot 522 on the other. The mutual insertion between the adjacent elastic fixing rods 52 improves the connection stability between the adjacent guard plates 1.

[0034] Reference Figure 8 The elastic snap-fit ​​component 13 includes a compression spring 132 and a positioning block 131. The bottom wall of the mounting notch 11 is provided with a placement groove 12 for inserting the compression spring 132 and the positioning block 131. When the two connecting rods 51 are rotated to the unfolded state, the compression spring 132 presses one side of the positioning block 131, causing the top of the positioning block 131 to protrude from the opening of the placement groove 12. At this time, the sides of the two connecting rods 51 that are close to each other abut against one side of the positioning block 131.

[0035] Refer to 9. Figure 10 and Figure 11 A collection bag 6 with an upward opening is provided on the side of the guard plate 1 facing the column 31. An elastic locking rod 53 with elastic shortening performance is rotatably connected to the top surface of the connecting rod 51. Both the elastic fixing rod 52 and the elastic locking rod 53 are conventional elastic telescopic structures with internal springs, which will not be described in detail here. A locking plate 54 is detachably installed on the end face of the elastic locking rod 53 away from the connecting rod 51. A first insert 541 is fixed on the side of the locking plate 54 facing the elastic locking rod 53, and a first slot 542 is opened. A first inclined surface 5411 is provided on the outer side edge of the first insert 541, and a second inclined surface 5421 is provided on the opening edge of the first slot 542. When inspecting facilities near road guardrails, adjust the two connecting rods 51 to the extended state, adjust the two elastic fixing rods 52 to the side-by-side state, and rotate the elastic locking rod 53 downwards to a horizontal state parallel to the elastic fixing rod 52. At this time, the fixing block 521 is inserted into the first slot 542, and the first block 541 is inserted into the first slot 542. Finally, insert the two sides of the opening of the collection bag 6 into and fix it to the gap between the elastic fixing rod 52 and the elastic locking rod 53, and use the collection bag 6 to collect the garbage generated during the inspection.

[0036] Reference Figure 12Two second slots 421 are provided on the top surface of the outer end of the limiting pin 42. When the two connecting rods 51 are rotated to the unfolded state and the two elastic fixing rods 52 are rotated to the coaxial state (that is, the road guardrail is in normal use), the elastic locking rod 53 is rotated to the vertically upward limiting state, and the locking plate 54 is rotated to the locking state that abuts against the top surface of the limiting pin 42. At this time, the first insert 541 is inserted into the second slot 421, thereby using the elastic locking rod 53 and the locking plate 54 to further lock the limiting pin 42.

[0037] Reference Figure 13 and Figure 14 The extension plate 2 has a vertically oriented accommodating notch 21 with a cross-section larger than that of the elastic locking rod 53 on the side facing the adjusting rod 32, and a third slot 22 is provided on the top surface. A third inclined surface 221 is provided at the opening edge of the third slot 22, and a fourth inclined surface 211 is provided at the opening edge of the accommodating notch 21. When the two connecting rods 51 are rotated to the storage state and the two elastic fixing rods 52 are rotated to the side-by-side state (i.e., road guardrail transportation), the elastic locking rod 53 is rotated to the limiting state within the receiving notch 21, and the locking plate 54 is rotated to the state of abutting against the top surface of the extension plate 2. At this time, the first insert block 541 is inserted into the third slot 22, which improves the assembly stability of the extension plate 2 and the guard plate 1 in this state.

[0038] The implementation principle of this application embodiment is as follows: During transportation, the staff moves the extension plate 2 down with the adjusting rod 32 until it abuts against the guard plate 1. After the limiting pin 42 passes through the clearance through hole 322, it is inserted into the clearance slot 411 to achieve fixation. At the same time, the elastic snap-fit ​​member 13 is manually pressed down so that the connecting rod 51 is stored in the installation notch 11 and the elastic fixing rod 52 is placed side by side. The elastic locking rod 53 is turned into the receiving notch 21 on the extension plate 2. The locking plate 54 abuts against the top surface of the extension plate 2 and the first insert 541 is inserted into the third slot 22, which improves the assembly stability and space utilization during transportation.

[0039] In normal application, the limit rod 41 is adjusted to create a gap between the extension plate 2 and the guard plate 1 and is locked by the limit member 4. The connecting rod 51 is rotated to be perpendicular to the guard plate 1 and is limited by the elastic snap-fit ​​member 13. The elastic fixing rods 52 on the same connecting rod 51 are rotated to be coaxial with each other. Adjacent elastic fixing rods 52 are inserted into each other through the fixing plug 521 and the fixing slot 522. At the same time, the elastic locking rod 53 is vertically upward, the locking plate 54 abuts against the limit pin 42 and the first plug 541 is inserted into the second slot 421, which enhances the connection stability and the limit reliability.

[0040] In the maintenance state, the connecting rod 51 is adjusted to the unfolded state, the elastic fixing rod 52 is adjusted to the side-by-side state, and the elastic locking rod 53 is rotated to a horizontal state and parallel to the elastic fixing rod 52. The collection bag 6 is fixed by the cooperation of the fixing block 521, the fixing slot 522, the first block 541 and the first slot 542, so that the opening of the collection bag 6 is inserted into the gap between the elastic fixing rod 52 and the elastic locking rod 53, realizing the collection of maintenance waste, taking into account both practicality and convenience.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular road guardrail, characterized in that, It includes a vertically arranged guard plate (1) and two columns (31) fixed on one side of the guard plate (1) in the vertical direction. An adjustment rod (32) that can be adjusted up and down is slidably provided on the top surface of the column (31). An extension plate (2) located above the guard plate (1) is fixed on the outer periphery of the two adjustment rods (32). The extension plate (2) can move down with the adjusting rod (32) to a transport state that abuts against the guard plate (1) and can move up with the adjusting rod (32) to an application state that has a gap with the guard plate (1). The outside of the column (31) is provided with a limiting member (4) to fix the adjusting rod (32) in the transport and application states.

2. A modular road guardrail according to claim 1, characterized in that, The limiting member (4) includes a limiting rod (41) coaxially fixed to the upper end face of the column (31) and a limiting pin (42) provided outside the adjusting rod (32). The lower end face of the adjusting rod (32) is provided with an adjusting through hole (321) for the limiting rod (41) to be inserted, and a clearance through hole (322) communicating with the adjusting through hole (321) is provided on the outer periphery. The upper end of the limiting rod (41) is provided with a clearance slot (411) that can coincide with the clearance through hole (322). The limiting pin (42) can pass through the corresponding clearance through hole (322) and be inserted into the clearance slot (411).

3. A modular road guardrail according to claim 2, characterized in that, An installation notch (11) is provided on the top surface of the guard plate (1) near the edge of the column (31). A connecting rod (51) is rotatably installed on the left and right bottom walls of the installation notch (11). An elastic snap-fit ​​(13) is provided on the bottom wall of the installation notch (11). Two elastic fixing rods (52) with elastic elongation properties are rotatably connected to the end face of the connecting rod (51) away from the guard plate (1). The rotating surfaces of the connecting rod (51) and the elastic fixing rod (52) are parallel to the top surface of the guard plate (1). A fixing block (521) and a fixing slot (522) are fixed on the end face of the elastic fixing rod (52) away from the connecting rod (51). When the extension plate (2) is in the transport state, the connecting rod (51) can be rotated to a storage state that is parallel to the guard plate (1) and within the installation notch (11). The two elastic fixing rods (52) on the same connecting rod (51) rotate to a parallel side-by-side state. When the extension plate (2) is in the application state, the connecting rod (51) can be rotated to an unfolded state that is perpendicular to the guard plate (1) and limited by the elastic snap-fit ​​(13). The two elastic fixing rods (52) on the same connecting rod (51) can rotate to a coaxial state with opposite directions. The fixing block (521) on one of the two adjacent elastic fixing rods (52) is inserted into the fixing slot (522) on the other.

4. A modular road guardrail according to claim 3, characterized in that, The elastic snap-fit ​​component (13) includes a compression spring (132) and a positioning block (131). The bottom wall of the mounting notch (11) is provided with a placement groove (12) for inserting the compression spring (132) and the positioning block (131). When the two connecting rods (51) are rotated to the unfolded state, the compression spring (132) presses one side of the positioning block (131) so that the top of the positioning block (131) protrudes from the opening of the placement groove (12). At this time, the sides of the two connecting rods (51) that are close to each other abut against one side of the positioning block (131).

5. A modular road guardrail according to claim 3, characterized in that, The guard plate (1) has an upward-opening collection bag (6) on the side facing the column (31). The top surface of the connecting rod (51) is rotatably connected to an elastic locking rod (53) with elastic shortening performance. A locking plate (54) is detachably installed on the end face of the elastic locking rod (53) away from the connecting rod (51). The locking plate (54) has a first insert (541) fixed on the side facing the elastic locking rod (53) and a first slot (542) opened. When the two elastic fixing rods (52) on the same connecting rod (51) are rotated to the unfolded state, they are rotated to the side-by-side state. At this time, the elastic locking rod (53) is rotated downward to the horizontal state parallel to the elastic fixing rod (52). The fixing block (521) is inserted into the first slot (542). The first block (541) is inserted into the first slot (542). The two sides of the opening of the collection bag (6) are inserted into and fixed to the gap between the elastic fixing rod (52) and the elastic locking rod (53).

6. A modular road guardrail according to claim 5, characterized in that, The first insert (541) has a first inclined surface (5411) at the outer edge of its outer side, and the first slot (542) has a second inclined surface (5421) at the opening edge of its opening.

7. A modular road guardrail according to claim 5, characterized in that, The top surface of the outer end of the limiting pin (42) is provided with a second slot (421); when the two connecting rods (51) are rotated to the unfolded state and the two elastic fixing rods (52) are rotated to the coaxial state, the elastic locking rod (53) is rotated to the vertically upward limiting state, the locking plate (54) is rotated to the locking state that abuts against the top surface of the limiting pin (42), and the first insert (541) is inserted into the second slot (421) at this time.

8. A modular road guardrail according to claim 5, characterized in that, The extension plate (2) has a vertically oriented accommodating notch (21) facing the adjusting rod (32) and a third slot (22) on its top surface; the elastic locking rod (53) is in a limited position within the accommodating notch (21) when the two connecting rods (51) are rotated to the retracted state and the two elastic fixing rods (52) are rotated to the side-by-side state, and the locking plate (54) is rotated to the state of abutting against the top surface of the extension plate (2), and the first insert (541) is inserted into the third slot (22) at this time.

9. A modular road guardrail according to claim 8, characterized in that, The third slot (22) has a third inclined surface (221) at the opening edge.

10. A modular road guardrail according to claim 8, characterized in that, A fourth inclined surface (211) is provided at the opening edge of the accommodating notch (21).

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