Embedded structure energy absorption layer combined type guardrail and construction method thereof

Abstract

The invention relates to the technical field of road and bridge accessory arrangement, in particular to an embedded structure energy absorption layer combined guardrail and a construction method thereof.The embedded structure energy absorption layer combined guardrail comprises a plurality of guardrail units sequentially arranged on the road surface, and each guardrail unit comprises a prefabricated supporting block, a structure energy absorption layer and a prefabricated anti-impact block which are sequentially arranged from the outer side to the inner side; the prefabricated supporting block is in an L shape and comprises a blocking section located on the outer side and a mounting section located at the bottom, and the structural energy absorption layer and the prefabricated anti-impact block are located above the mounting section. The structure energy absorption layer is a metal honeycomb structure energy absorption layer; the prefabricated anti-impact block adopts a head-on collision surface with a guiding function; the prefabricated supporting blocks and the structural energy absorption layer are connected through glue joint, and the structural energy absorption layer and the prefabricated anti-impact blocks are connected through glue joint. The guardrail structure is reasonably arranged, so that the guardrail has a buffering function while retaining a blocking function and a guiding function, the safety is improved, and the guardrail is simple in structure, convenient to construct and capable of improving the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of road and bridge ancillary facilities, and in particular to a combined guardrail with an embedded structural energy-absorbing layer and a construction method thereof. Background Art

[0002] Highway guardrails are important safety protection facilities erected on both sides of the road in the direction of driving. By setting up specific guardrail structures to block and smoothly guide out-of-control vehicles, it can prevent traffic accidents from further deteriorating and avoid the occurrence of secondary accidents. The working principle of the guardrail is to use the specific shape of the collision surface to force the out-of-control vehicle to climb upwards, thereby converting kinetic energy into potential energy, or dissipating kinetic energy through the deformation of the guardrail, thereby minimizing the damage to the vehicle's occupants in a traffic accident.

[0003] According to the design specifications and regulations issued by the Ministry of Transport, the F-type guardrail has a special shape of the collision surface, which makes the F-type guardrail have a good guiding effect; the traditional F-type guardrail is usually cast in concrete, which makes the F-type concrete guardrail also have a good blocking effect. However, the traditional F-type concrete guardrail also has problems such as excessive rigidity and insufficient buffering function, which makes the guardrail cause a large acceleration of the vehicle during the collision in actual application, causing serious injuries to the occupants.

[0004] In response to the problems of excessive rigidity and insufficient buffering function of traditional F-type concrete guardrails, researchers have proposed the following optimization and improvement plans: 1. Adding a glass fiber composite flexible guard plate to the traditional F-type guardrail can, on the one hand, increase the height of the guardrail, reduce the degree of roll of the colliding vehicle, and improve the protection capability; on the other hand, it can reduce the rigidity of the guardrail, reduce the impact force, and reduce damage to vehicles and personnel. 2. Replace the rigid concrete material on the collision surface of the traditional F-type guardrail with foam concrete material and add a buffer block, thereby reducing the rigidity of the traditional guardrail, improving the buffering function, and absorbing energy in the event of a collision, thereby improving passenger safety. 3. Add a set of semi-rigid guardrails on the inside of the traditional F-type guardrail, so that the guardrail has both the blocking function of a rigid guardrail and the buffering function of a semi-rigid guardrail.

[0005] However, the first guardrail optimization scheme has a low strength of the composite material protective plate, and the protective plate is prone to local dents when impacted, which reduces the guiding function of the guardrail; the foam concrete of the second guardrail optimization scheme is easy to disintegrate when impacted, and fragments are easily splashed and invade the cockpit, threatening the safety of the occupants. In addition, the foam concrete is set on the collision surface, which reduces the guiding function of the guardrail, making the vehicle very prone to rollover; the third guardrail optimization scheme has a high construction cost and a large road width requirement, and the semi-rigid guardrail is set on the inner side of the rigid guardrail, which makes the rigid guardrail lose its guiding function.

[0006] At present, there is no F-type guardrail on the market that has blocking and guiding functions as well as buffering functions and has a reasonable structure. Summary of the invention

[0007] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a combined guardrail with an embedded structure energy-absorbing layer that can simultaneously maintain buffering performance and guiding function.

[0008] Another object of the present invention is to provide a construction method for a combined guardrail with an embedded structural energy-absorbing layer.

[0009] In order to achieve the above object, the present invention adopts the following technical solution: A combined guardrail with an embedded structural energy absorption layer comprises a plurality of guardrail units arranged in sequence on a road surface, wherein the guardrail units comprise a prefabricated support block, a structural energy absorption layer and a prefabricated impact-resistant block arranged in sequence from the outside to the inside; the prefabricated support block is in an "L" shape, comprising a blocking section located on the outside and an installation section located at the bottom, and the structural energy absorption layer and the prefabricated impact-resistant block are located above the installation section; the structural energy absorption layer is a metal honeycomb structure energy absorption layer; the prefabricated impact-resistant block adopts a collision surface with a guiding function; the prefabricated support block and the structural energy absorption layer, as well as the structural energy absorption layer and the prefabricated impact-resistant block are all connected by gluing.

[0010] Furthermore, a plurality of grouting channels are provided on the installation section of the prefabricated support block, and a grouting groove is opened above the grouting channel; steel bars matching the grouting channels are pre-embedded on the road surface; the prefabricated support block and the road surface are installed in cooperation with the grouting channels and the steel bars, and concrete is poured into the grouting channels through the grouting grooves to fix the connection.

[0011] Furthermore, the metal honeycomb structure energy absorption layer includes a plurality of structural cells, which are periodically arranged to form the metal honeycomb structure energy absorption layer; the structural energy absorption layer is provided with three layers of structural cells along the thickness direction of the guardrail, and multiple layers of structural cells are periodically arranged along the length direction of the guardrail, and a single structural cell is in a tubular structure in the height direction of the guardrail.

[0012] Furthermore, the prefabricated impact-resistant block includes a collision surface and a vertical surface; the collision surface includes a first inclined surface with an angle of 55° to the horizontal plane, and a second inclined surface with an angle of 84° to the horizontal plane, and the bottom of the second inclined surface is connected to the top of the first inclined surface; the vertical surface is perpendicular to the upper surface of the installation section.

[0013] Furthermore, along the length direction, angle steel bars corresponding to the shape of the prefabricated impact-resistant blocks are provided on both sides of the prefabricated impact-resistant blocks, and the angle steel bars of the two prefabricated impact-resistant blocks on adjacent guardrail units are fixedly connected by welding, thereby fixing the two adjacent guardrail units.

[0014] Furthermore, the thickness of the structural energy absorbing layer is 90 mm.

[0015] Furthermore, the tops of the prefabricated supporting blocks, the structural energy absorbing layer and the prefabricated impact-resistant blocks are flush.

[0016] Furthermore, the shape of the structural cell is a concave hexagon, a concave arc, a semi-concave hexagon or a hexagon.

[0017] Furthermore, the prefabricated support block and the structural energy absorbing layer, and the structural energy absorbing layer and the prefabricated impact-resistant block are all connected by epoxy resin bonding.

[0018] A construction method for a combined guardrail embedded with a structural energy absorption layer comprises the following construction steps: S1: preparing prefabricated support blocks, prefabricated impact-resistant blocks and a structural energy absorption layer in a factory and transporting them to an installation point; S2: installing the prefabricated support blocks, aligning grouting channels with the embedded steel bars on the road surface and embedding them, and grouting the prefabricated support blocks to the road surface on site from grouting grooves; S3: evenly applying epoxy resin to one side of the structural energy absorption layer and gluing and fixing it to the fixed prefabricated support blocks; S4: also evenly applying epoxy resin to the other side of the fixed structural energy absorption layer, and gluing and fixing the prefabricated impact-resistant blocks to the structural energy absorption layer; S5: welding and fixing the angle steel bars arranged on both sides of the prefabricated impact-resistant blocks on adjacent guardrail units, thereby fixing two adjacent guardrail units; S6: repeating steps S2-S5 until all guardrail units are installed.

[0019] The principle of the present invention is as follows: the present invention adopts the means of dividing the guardrail cross section and embedding the structural energy absorption layer to form a sandwich-type combined guardrail, and utilizes the energy absorption characteristics of the metal honeycomb under impact compression deformation, thereby effectively solving the problem of excessive stiffness of the guardrail and improving the buffering function of the guardrail; secondly, since the new combined guardrail does not change the size of the collision surface of the existing concrete guardrail, the blocking function and guiding function of the new guardrail are not affected; finally, the new guardrail is assembled by combining multiple parts, so the new guardrail does not need to be cast on site, which can effectively shorten the construction period of the guardrail.

[0020] In general, the present invention has the following advantages: 1. The present invention utilizes the excellent performance of metal honeycomb structural materials, uses metal honeycomb structural materials to make a structural energy absorption layer, and arranges the structural energy absorption layer between the prefabricated support block and the prefabricated impact-resistant block. The structural energy absorption layer becomes a key part connecting the prefabricated support block and the prefabricated impact-resistant block, so that the guardrail forms a whole, while retaining the blocking function and guiding function of the traditional F-type concrete guardrail, it also has a buffer function, which greatly reduces the damage to the out-of-control vehicle and the occupants when colliding with the guardrail.

[0021] 2. The present invention fixes the prefabricated support block, the structural energy-absorbing layer and the prefabricated impact-resistant block together by gluing to form a whole. After a vehicle collides with the guardrail, the structural energy-absorbing layer is sandwiched between the prefabricated support block and the prefabricated impact-resistant block. If the structural energy-absorbing layer absorbs energy and breaks, its fragments will not splash, thereby further improving the safety of people around the accident.

[0022] 3. The prefabricated support blocks, structural energy absorption layers and prefabricated impact-resistant blocks in the present invention are all prepared in a factory, with a simple structure and quick construction, which can improve construction efficiency and shorten the construction period.

[0023] 4. The prefabricated support blocks, structural energy-absorbing layers, and prefabricated impact-resistant blocks are connected in sequence by gluing. When the guardrail is hit not too seriously, only the structural energy-absorbing layer needs to be replaced, which is easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the present invention.

[0025] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0026] Figure 3 It is the reinforcement diagram of the present invention.

[0027] Figure 3 a is the reinforcement diagram of the guardrail cross section in the present invention.

[0028] Figure 3 b is the reinforcement diagram of the prefabricated support block.

[0029] Figure 3 c is the reinforcement diagram of prefabricated impact-resistant blocks.

[0030] Figure 4 It is a schematic structural diagram of the structural energy absorbing layer of the present invention.

[0031] Figure 5 It is the impact force curve of the passenger car-guardrail collision process of the present invention.

[0032] Figure 6 It is the X-axis acceleration curve of the passenger car-guardrail collision of the present invention.

[0033] Figure 7 It is the Y-axis acceleration curve of the passenger car-guardrail collision of the present invention.

[0034] Figure 8 It is the impact force curve of the bus-guardrail collision process of the present invention.

[0035] Fig. 9 This is the height variation curve of the rear end of the bus when it collides with the guardrail of the present invention.

[0036] Fig.10 It is the impact force curve of the large truck-guardrail collision process of the present invention.

[0037] Fig.11 This is the maximum camber value variation curve of the vehicle in the large truck-guardrail collision of the present invention.

[0038] Among them, 1 is a prefabricated support block, 11 is a grouting channel, 2 is a structural energy absorption layer, 3 is a prefabricated impact-resistant block, 31 is an angle steel bar, 32 is a first inclined plane, and 33 is a second inclined plane. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] Embodiment 1, like Figure 1-4 As shown, a combined guardrail with an embedded structural energy absorption layer comprises a plurality of guardrail units arranged in sequence on a road surface, the guardrail unit comprising a prefabricated support block, a structural energy absorption layer, and a prefabricated impact-resistant block arranged in sequence from the outside to the inside; the prefabricated support block is in an "L" shape, comprising a blocking section located on the outside and an installation section located at the bottom, the structural energy absorption layer and the prefabricated impact-resistant block are located above the installation section; the structural energy absorption layer is a metal honeycomb structure energy absorption layer; the prefabricated impact-resistant block adopts a collision surface with a guiding function; the prefabricated support block and the structural energy absorption layer, as well as the structural energy absorption layer and the prefabricated impact-resistant block are all connected by gluing.

[0041] like Figure 2 As shown, a plurality of grouting channels are arranged on the installation section of the prefabricated support block, and a grouting groove is opened above the grouting channel; steel bars matching the grouting channels are pre-embedded on the road surface; the prefabricated support block and the road surface are installed in coordination with the grouting channels and the steel bars, and are fixedly connected by pouring concrete into the grouting channels through the grouting grooves.

[0042] Specifically, multiple grouting holes are reserved on the installation section of the prefabricated support block in the pre-preparation stage, and steel bars matching the grouting holes are reserved on the road surface. During construction, the grouting holes are aligned with the steel bars for installation. After installation, concrete slurry is poured into the grouting holes through the grouting grooves. After the concrete slurry solidifies, a fixed connection between the prefabricated support block and the road surface is achieved.

[0043] In this embodiment, the prefabricated support blocks and the prefabricated impact-resistant blocks are cast with ultra-high performance concrete materials, and the reinforcement is based on the thickness requirements of the ultra-high performance concrete protective layer. Such a setting can greatly enhance the structural strength of the guardrail, so that the blocking function and guiding function of the guardrail will not be weakened or lost due to the addition of a buffer function.

[0044] like Figure 2As shown, the prefabricated impact-resistant block includes a collision surface and a vertical surface; the collision surface includes a first inclined surface with an angle of 55° to the horizontal plane, and a second inclined surface with an angle of 84° to the horizontal plane, and the bottom of the second inclined surface is connected to the top of the first inclined surface; the vertical surface is perpendicular to the upper surface of the installation section.

[0045] Specifically, the collision surface is consistent with the collision surface structure of the traditional F-type concrete guardrail, both of which are inclined at both ends. This setting can make the guardrail have a good guiding function. When a vehicle collides with the guardrail, the special guardrail collision surface structure can enable the vehicle to convert kinetic energy into potential energy, greatly reducing the damage to the occupants of the out-of-control vehicle.

[0046] like Figure 1 As shown, along the length direction, angle steel bars corresponding to the shape of the prefabricated impact-resistant blocks are arranged on both sides of the prefabricated impact-resistant blocks, and the angle steel bars of the two prefabricated impact-resistant blocks on adjacent guardrail units are fixedly connected by welding, thereby fixing the two adjacent guardrail units.

[0047] Specifically, in order to ensure the structural continuity of the guardrail of the present invention when it collides with a car, angle steel bars are embedded at the left and right edge positions of the impact-resistant section when casting the prefabricated impact-resistant blocks in each stage. After the multi-section guardrail is installed in place, the angle steel bars of the two adjacent prefabricated impact-resistant blocks are fixedly connected by welding, so that the prefabricated impact-resistant blocks of the two adjacent guardrail units are fixedly connected.

[0048] like Figure 2 As shown, in this embodiment, the prefabricated support block and the structural energy absorbing layer, and the structural energy absorbing layer and the prefabricated impact-resistant block are all connected by epoxy resin bonding.

[0049] Specifically, the prefabricated support block, the structural energy absorption layer and the prefabricated impact-resistant block are fixed as a whole by gluing, which can reduce the construction and installation procedures, improve the efficiency of construction and installation, and greatly shorten the construction period.

[0050] The structural energy absorbing layer is located between the prefabricated support block and the prefabricated impact-resistant block, and is not only a key part connecting the front and rear parts, but also a main energy-consuming part of the guardrail in the present invention. In the present invention, the structural energy absorbing layer is a metal honeycomb structure energy absorbing layer.

[0051] The metal honeycomb structure energy absorption layer includes a plurality of structural cells, which are periodically arranged to form the metal honeycomb structure energy absorption layer; the structural energy absorption layer is provided with three layers of structural cells along the thickness direction of the guardrail, and multiple layers of structural cells are periodically arranged along the length direction of the guardrail, and a single structural cell is in a tubular structure in the height direction of the guardrail.

[0052] like Figure 4 As shown, the shape of the structural cell is a concave hexagon, a concave arc, a semi-concave hexagon or a hexagon.

[0053] Specifically, Figure 4 The x direction is the length direction of the guardrail, the y direction is the thickness direction of the guardrail, the z direction is the height direction of the guardrail, and the direction in which the impact resistance of the structural cell is best is set along the thickness direction.

[0054] In this embodiment, the structural cell adopts Figure 4 The a shown is a concave hexagonal structure.

[0055] In this embodiment, the structural energy absorbing layer has a thickness of 90 mm, a height of 925 mm, and a length of 4000 mm.

[0056] Specifically, honeycomb material is a porous lightweight material with periodically arranged structural cells. Compared with continuous medium materials, honeycomb materials have excellent performance in impact load energy absorption. Honeycomb materials also have the following characteristics: 1. Irreversible energy conversion; 2. Restricted constant reaction force; 3. Long impact stroke; 4. Stable and repeatable deformation mode; 5. Light weight and high specific energy absorption; 6. Low cost and easy installation.

[0057] The metal honeycomb structure energy-absorbing layer made of honeycomb material is combined with prefabricated support blocks and prefabricated impact-resistant blocks cast with ultra-high performance concrete. The size of the existing F-type concrete guardrail collision surface is not changed, so that the guardrail can have good blocking, guiding and buffering functions at the same time, which can greatly improve the safety performance of the guardrail, enable it to meet the increasing road driving safety needs, and increase road driving safety.

[0058] The construction method of the guardrail described in Example 1, A construction method of a combined guardrail with an embedded structural energy absorption layer in the present invention comprises the following construction steps: S1: Prepare prefabricated support blocks, prefabricated impact-resistant blocks and structural energy-absorbing layers in the factory and transport them to the installation site; S2: Install the prefabricated support block, align the grouting channel with the embedded steel bars on the road surface and embed them, and grout from the grouting groove into the grouting channel on site to fix the prefabricated support block to the road surface; S3: Evenly apply epoxy resin on one side of the structural energy absorbing layer and glue it to the fixed prefabricated support block; S4: Evenly apply epoxy resin on the other side of the fixed structural energy absorbing layer, and glue and fix the prefabricated impact-resistant block on the structural energy absorbing layer; S5: welding and fixing the angle steel bars arranged on both sides of the prefabricated impact-resistant blocks on adjacent guardrail units, thereby fixing the two adjacent guardrail units; S6: Repeat steps S2-S5 until all guardrail units are installed.

[0059] Performance test analysis of the guardrail described in Example 1, According to the current "Highway Guardrail Safety Performance Evaluation Standard", the anti-collision performance of the guardrail of the present invention and the existing concrete guardrail is compared and analyzed. The experimental results are as follows: Figure 5-11 As shown, Figure 5-7 It is the result analysis of the passenger car-guardrail collision. Figure 8-9 It is the analysis of the bus-guardrail collision results. Figure 10-11 Analysis of large truck-guardrail collision results.

[0060] According to data research, the anti-collision performance of the guardrail of the present invention is better than that of the existing concrete guardrail: in the collision results of a 1.5 t small passenger car, its collision peak force was reduced by 15.1% compared with that of the existing concrete guardrail, and the peak accelerations in the X and Y directions of the vehicle's center of mass were reduced by 12.7% and 22.8% respectively; in the collision results of a 14 t large passenger car, the collision peak force in the tail-swinging stage of the vehicle was reduced by 25.2% compared with that of the existing concrete guardrail, and during the collision, the ups and downs of the front of the large passenger car colliding with the new guardrail were smaller; in the collision process of a 25 t large truck, the collision peak force in the tail-swinging stage of the vehicle was reduced by 26.7% compared with that of the existing concrete guardrail, and the maximum dynamic camber value during the collision between the vehicle and the new guardrail was smaller, and the rollover tendency was lower compared with the existing concrete guardrail.

[0061] Embodiment 2, The difference between this embodiment and embodiment 1 is that in this embodiment, the structural cell adopts Figure 4 The concave arc structure shown in b.

[0062] The construction method of the guardrail in this embodiment is the same as the construction method of the guardrail described in Example 1.

[0063] Embodiment 3, The difference between this embodiment and embodiment 1 is that in this embodiment, the structural cell adopts Figure 4 The c shown is a semi-concave hexagonal structure.

[0064] The construction method of the guardrail in this embodiment is the same as the construction method of the guardrail described in Example 1.

[0065] Embodiment 4, The difference between this embodiment and embodiment 1 is that in this embodiment, the structural cell adopts Figure 4 The hexagonal honeycomb structure shown in Figure d.

[0066] The construction method of the guardrail in this embodiment is the same as the construction method of the guardrail described in Example 1.

[0067] In general, the present invention adopts the means of dividing the guardrail cross section and embedding the structural energy absorption layer to form a sandwich-type combined guardrail, and utilizes the energy absorption characteristics of metal honeycomb due to compression and deformation under impact, thereby effectively solving the problem of excessive stiffness of the guardrail and improving the buffering function of the guardrail; secondly, since the new combined guardrail does not change the size of the collision surface of the existing concrete guardrail, the blocking function and guiding function of the new guardrail are not affected; finally, the new guardrail is assembled by combining multiple parts, so the new guardrail does not need to be cast on site, which can effectively shorten the construction period of the guardrail.

[0068] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A combined guardrail with an embedded structural energy-absorbing layer, comprising a plurality of guardrail units sequentially arranged on a road surface, characterized in that: The guardrail unit includes a prefabricated support block, a structural energy absorption layer, and a prefabricated impact-resistant block which are arranged in sequence from the outside to the inside; the prefabricated support block is in an "L" shape, including a blocking section located on the outside and an installation section located at the bottom, and the structural energy absorption layer and the prefabricated impact-resistant block are located above the installation section; the structural energy absorption layer is a metal honeycomb structure energy absorption layer; the prefabricated impact-resistant block adopts a collision surface with a guiding function; the prefabricated support block and the structural energy absorption layer, as well as the structural energy absorption layer and the prefabricated impact-resistant block are all connected by gluing.

2. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: A plurality of grouting channels are arranged on the installation section of the prefabricated support block, and a grouting groove is opened above the grouting channel; steel bars matching the grouting channels are pre-buried on the road surface; the prefabricated support block and the road surface are installed in coordination with the grouting channels and the steel bars, and concrete is poured into the grouting channels through the grouting grooves to fix the connection.

3. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: The metal honeycomb structure energy absorption layer includes a plurality of structural cells, which are periodically arranged to form the metal honeycomb structure energy absorption layer; the structural energy absorption layer is provided with three layers of structural cells along the thickness direction of the guardrail, and multiple layers of structural cells are periodically arranged along the length direction of the guardrail, and a single structural cell is in a tubular structure in the height direction of the guardrail.

4. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: The prefabricated impact-resistant block includes a collision surface and a vertical surface; the collision surface includes a first inclined surface with an angle of 55° to the horizontal plane, and a second inclined surface with an angle of 84° to the horizontal plane, and the bottom of the second inclined surface is connected to the top of the first inclined surface; the vertical surface is perpendicular to the upper surface of the installation section.

5. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: Along the length direction, angle steel bars corresponding to the shape of the prefabricated impact-resistant blocks are arranged on both sides of the prefabricated impact-resistant blocks. The angle steel bars of the two prefabricated impact-resistant blocks on adjacent guardrail units are fixedly connected by welding, thereby fixing the two adjacent guardrail units.

6. The embedded structure energy absorbing layer combined guardrail according to claim 3, characterized in that: The thickness of the structural energy absorbing layer is 90 mm.

7. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: The tops of the prefabricated supporting blocks, the structural energy absorbing layer and the prefabricated impact-resistant blocks are flush.

8. The embedded structure energy absorbing layer combined guardrail according to claim 3, characterized in that: The shape of the structural cell is a concave hexagon, a concave arc, a semi-concave hexagon or a hexagon.

9. The embedded structure energy absorbing layer combined guardrail according to claim 1, characterized in that: The prefabricated support block and the structural energy absorbing layer, as well as the structural energy absorbing layer and the prefabricated impact-resistant block are all connected by epoxy resin bonding.

10. A construction method for a combined guardrail with an embedded structural energy absorption layer according to any one of claims 1 to 9, characterized in that: The construction steps include: S1: Prepare prefabricated support blocks, prefabricated impact-resistant blocks and structural energy-absorbing layers in the factory and transport them to the installation site; S2: Install the prefabricated support block, align the grouting channel with the embedded steel bars on the road surface and embed them, and grout from the grouting groove into the grouting channel on site to fix the prefabricated support block to the road surface; S3: Evenly apply epoxy resin on one side of the structural energy absorbing layer and glue it to the fixed prefabricated support block; S4: Evenly apply epoxy resin on the other side of the fixed structural energy absorbing layer, and glue and fix the prefabricated impact-resistant block on the structural energy absorbing layer; S5: welding and fixing the angle steel bars arranged on both sides of the prefabricated impact-resistant blocks on adjacent guardrail units, thereby fixing the two adjacent guardrail units; S6: Repeat steps S2-S5 until all guardrail units are installed.

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