Guardrail and method of installation
A wood-based guardrail with spacer blocks and a deformable connecting member addresses the environmental and structural limitations of steel and plastic-reinforced wood guardrails, providing safety and flexibility without plastic, suitable for curved roads and high-speed impacts.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
- Filing Date
- 2024-04-11
- Publication Date
- 2026-06-16
AI Technical Summary
Existing guardrails made of steel or plastic-reinforced wood face environmental imbalance due to the use of non-renewable materials and brittle fracture during tension, while wood-based guardrails lack sufficient tensile strength and plastic deformation.
A guardrail design comprising two outer layers of wood or wood-based materials, separated by spacer blocks, with a connecting member that allows for plastic deformation, absorbing impact energy and transmitting it to the ground, eliminating the need for plastic reinforcement.
The design achieves equivalent safety to steel guardrails without using plastic, maintaining environmental balance and ensuring predictable, configurable properties with adjustable deformation, suitable for curved roads and high-speed impacts.
Smart Images
Figure 2026519350000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a guardrail that is divided into at least two partial sections along its longitudinal direction and joined by at least one connecting member. The present invention also relates to a method of installing such a guardrail. This type of guardrail is known as a restraint system on roads.
Background Art
[0002] DE102015108873A1 discloses this type of guardrail. This known guardrail is composed of solid wood or laminated wood reinforced with at least one layer of plastic material having flexibility and excellent tensile strength. The guardrail is fixed to posts fixed to the road shoulder at a predetermined height. During a vehicle collision, energy is absorbed by the combination of the destruction of the wood and the flexibility of the posts. The plastic reinforcement ensures the tensile belt effect of the guardrail and prevents the vehicle from breaking through even if individual wood cross-sections are destroyed. The tensile force is transmitted to the ground over the entire length of the guardrail through the connection to the posts.
[0003] This known guardrail has the advantage that wood has a very high load-bearing capacity relative to its mass. As a renewable raw material, wood has a negative carbon footprint, that is, the CO2 emitted during processing is less than the amount stored in the wood itself. However, the disadvantages include brittle fracture during tension and low plastic deformation behavior. The known guardrail solves this problem by incorporating a flexible plastic material with excellent tensile strength. However, this again deteriorates the environmental balance of the guardrail.
Summary of the Invention
Problems to be Solved by the Invention
[0004] Based on prior art, an objective in one aspect of the present invention is to provide a guardrail that has a better environmental balance than known guardrails made of steel or plastic-reinforced wood, while at the same time providing the same level of safety as known and widely used steel guardrails. [Means for solving the problem]
[0005] In one aspect, this application describes the guardrail described in claim 1. In another aspect, this application describes the method described in claim 13. Advantageous further developments of the invention are described in the dependent claims.
[0006] In yet another embodiment, the application also describes a guardrail having a first outer layer, a second outer layer spaced therefrom, and a plurality of spacer blocks arranged between the outer layers. The guardrail is divided into at least two sub-sections along its longitudinal direction and joined by at least one connecting member. The connecting member has a first longitudinal section, a second longitudinal section, and a third longitudinal section, the first and third longitudinal sections are designed to connect to the respective sub-sections of the guardrail, and the second longitudinal section connects the first and third longitudinal sections to each other. The spacer blocks at the ends of the sub-sections have at least one longitudinally extending hole through which the first or third longitudinal section of the connecting member is guided.
[0007] According to one aspect of the present invention, a guardrail is proposed. This guardrail can be used as a restraint system on a road. The guardrail may have a first outer layer and a second outer layer spaced apart therefrom. The outer layers may be arranged such that the height measured vertically is greater than the width measured horizontally. In some embodiments of the present invention, the height can be about 4 to about 20 times the width. In other embodiments of the present invention, the height can be about 10 to about 20 times the width.
[0008] Between the first outer layer and a second outer layer spaced apart therefrom, there are multiple spacer blocks positioned between the outer layers. This design allows the guardrail to undergo a predetermined deformation upon impact, avoiding undesirable force peaks. Furthermore, the guardrail functions as a tension band, similar to known steel guardrails, and energy is transmitted through the tension band to the posts and from there into the ground. Preferably (but not required), the guardrail does not contain plastic parts or plastic reinforcements. It was a complete surprise that the proposed design, consisting of a first outer layer, a second outer layer spaced apart therefrom, and spacer blocks positioned between them, proved to achieve a level of safety equivalent to known guardrails without using problematic plastic parts.
[0009] In embodiments of the present invention, the first outer layer, the second outer layer, and the spacer block may consist solely of wood or wood-based materials. Furthermore, the wood-based materials may consist primarily of wood, except for any necessary adhesive joints or binders. In embodiments of the present invention, the first outer layer and / or the second outer layer do not contain metal, alloy, or metallic materials.
[0010] In one embodiment of the present invention, the outer side of the second outer layer may be designed and intended to be connected to at least one support post. Thus, the proposed guardrail is positioned entirely on the road side of the support post, with the first outer layer facing the road side and the second outer layer facing the side away from the road, i.e., the support post side. Therefore, the support post is not located between the first and second outer layers.
[0011] In yet another aspect, the present invention relates to a method for installing a guardrail, comprising the steps of inserting at least two posts and fixing the guardrail to the posts. The guardrail is divided into at least two subsections along its longitudinal direction, the subsections being joined by at least one connecting member, and the guardrail comprises a first outer layer, a second outer layer spaced therefrom, and a plurality of spacer blocks, the spacer blocks being arranged between the outer layers.
[0012] In embodiments of the present invention, the second outer layer facing away from the road is connectable to a support post. In embodiments of the present invention, the second outer layer facing away from the road is screwable to a support post.
[0013] In one embodiment of the present invention, the guardrail is divisible into at least two subsections along its longitudinal direction, which are joined or can be joined by at least one connecting member. This facilitates the installation of long guardrails, which may reach several kilometers in length under certain circumstances.
[0014] In one embodiment of the present invention, at least one connecting member has a first longitudinal section, a second longitudinal section, and a third longitudinal section, the first and third longitudinal sections being designed to connect to the respective subsections of the guardrail, and the second longitudinal section connecting the first and third longitudinal sections to each other. In an embodiment of the present invention, the connecting member may be made of metal or an alloy. For example, the connecting member may include, or be made of, aluminum, steel, or stainless steel. In an embodiment of the present invention, spacer blocks provided at the ends of each subsection of the guardrail may be provided with holes into which the connecting member or the corresponding first or third longitudinal section can be inserted. The connecting member is bonded or screwed into these through holes. Alternatively, the holes may be designed as through holes, and the first and third longitudinal sections of the connecting member may be made longer than the extensions of the spacer blocks, so that the first and third longitudinal sections can be screwed to each other at the exit of each spacer block. In one embodiment of the present invention, the holes may extend horizontally or along the longitudinal direction of the guardrail.
[0015] In one embodiment of the present invention, the second longitudinal section of the connecting member may have a cross-sectional area corresponding to approximately 50% to approximately 80% of the cross-sectional areas of the first and third longitudinal sections. If threads are provided on the first and third longitudinal sections, the cross-sectional area of the second longitudinal section refers to the diameter of the thread core. This type of embodiment allows for plastic deformation of the connecting member when the guardrail is subjected to a lateral impact. The degree of plastic deformation can be adjusted by appropriately designing the cross-sectional area of the second longitudinal section of the connecting member. This makes it possible to achieve higher safety in the guardrail of the present invention.
[0016] In one embodiment of the present invention, the first and third longitudinal sections of the connecting member may have circular cross-sections. This allows the connecting member to be easily manufactured by cutting a circular semi-finished product, and the second longitudinal section can be formed by machining. For example, the cross-sectional area of the second longitudinal section can be reduced by drilling, milling, or turning.
[0017] In embodiments of the present invention, the first and third longitudinal sections may have a diameter of approximately 18 mm to approximately 30 mm, or approximately 20 mm to approximately 27 mm. This type of cross-sectional shape has been demonstrated to be sufficient to enable an appropriate level of safety and sufficient load-bearing capacity for the guardrail, on the one hand, and to enable efficient use of material, on the other hand.
[0018] In one embodiment of the present invention, the first and third longitudinal sections of the connecting member may be provided with external threads at least partially. This allows for the simple and reversible assembly of guardrail sections by inserting the connecting member into the corresponding hole in the spacer block and tightening both ends with nuts and washers on the outside of the spacer block.
[0019] In embodiments of the present invention, the first outer layer and / or the second outer layer and / or the spacer blocks may include or be composed of bonded wood and / or laminated wood and / or laminated veneer (LVL) and / or parallel strand (PSL). In one embodiment of the present invention, the first outer layer and / or the second outer layer and / or the spacer blocks may be manufactured from a wood material composed of wood bonded in the same fiber direction. This makes it possible to homogenize the non-uniformity inherent in the wood as much as possible and manufacture outer layers and spacer blocks having predetermined properties. As a result, it is possible to obtain a guardrail with predictable and configurable properties, which are kept constant within narrow tolerances. Bonding can be carried out using condensation adhesives and / or addition polymerization adhesives. In one embodiment of the present invention, melamine resin or phenol-resorcinol resin adhesives or polyurethane adhesives can be used.
[0020] In embodiments of the present invention, the first outer layer and / or the second outer layer are made of bonded wood and / or laminated wood, and the bonded joints can run substantially horizontally. This makes it possible to achieve high stability and / or higher weather resistance of the guardrail.
[0021] In one embodiment of the present invention, the spacer block at the end of a partial section may have at least one longitudinally extending hole, which is about 5% to about 25% larger than the diameters of the first and third longitudinal sections of the connecting member. In another embodiment of the present invention, the spacer block at the end of a partial section may have at least one longitudinally extending hole, which is about 10% to about 20% larger than the diameters of the first and third longitudinal sections of the connecting member. In yet another embodiment, the spacer block at the end of a partial section has at least one longitudinally extending hole, which is about 11% to about 16% larger than the diameters of the first and third longitudinal sections of the connecting member. This allows the guardrail to be adapted to curved roads by utilizing the clearance resulting from the oversized holes at the joints between partial sections and joining the partial sections at angles deviating from 180°. For this purpose, one or both ends of adjacent partial sections may be chamfered by machining, for example, by cutting, grinding, or cutting. This allows for gap-free joining at the joints between adjacent sections, even on curved roads. This chamfering can be done on-site with simple tools during guardrail installation, and the oversized screw connection holes allow for corresponding angular deviations.
[0022] In one embodiment of the present invention, the first outer layer and / or the second outer layer may have a horizontal thickness of about 50 mm to about 200 mm. In another embodiment of the present invention, the first outer layer and / or the second outer layer may have a horizontal thickness of about 60 mm to about 100 mm. In yet another embodiment, the first outer layer and / or the second outer layer may have a horizontal thickness of about 70 mm to about 90 mm. This allows for a resource-saving structure and lighter weight for easier installation of the guardrail, on the one hand, and ensures sufficient stability even when hit by large or high-speed vehicles.
[0023] In one embodiment of the present invention, the first outer layer and / or the second outer layer may have a vertical height of approximately 280 mm to approximately 370 mm. In another embodiment of the present invention, the first outer layer and / or the second outer layer may have a vertical height of approximately 290 mm to approximately 350 mm. Since this type of guardrail conforms to all current standards, the guardrail of the present invention is identical to known steel guardrails and does not require obtaining individual approval or complex static calculations.
[0024] In one embodiment of the present invention, the first outer layer may have a vertical height approximately 10 mm to 50 mm greater than that of the second outer layer. This enlarges the impact surface toward the road, reducing or preventing the occurrence of a force peak on the colliding vehicle. Furthermore, the upper end of the guardrail, which is exposed to the weather, is sloped to allow rainwater to flow off, thereby avoiding or mitigating weather-related damage.
[0025] In one embodiment of the present invention, the height of the spacer block, measured vertically, may correspond to the height of the outer layer. Therefore, the spacer block ensures sufficient stability while not protruding from the outer layer, thus minimizing the risk of injury to pedestrians and cyclists in the event of a collision.
[0026] In one embodiment of the present invention, the spacer block may have a thickness measured in the horizontal direction of about 90 mm to about 150 mm. In another embodiment of the present invention, the spacer block may have a thickness measured in the horizontal direction of about 100 mm to about 140 mm. In still another embodiment, the spacer block may have a thickness measured in the horizontal direction of about 110 mm to about 130 mm. In one embodiment of the present invention, the spacer block may have a length measured in the longitudinal direction of the guard plate of about 200 mm to about 300 mm. In another embodiment of the present invention, the spacer block may have a length measured in the longitudinal direction of the guard rail of about 300 mm to about 600 mm. In one embodiment of the present invention, the spacer block at the end of the guard rail partial section may have a longer length than the spacer block at the central portion of the partial section. The spacer block having the defined dimensions, on the one hand, enables the steel guard rail to be easily replaced with the guard rail of the present invention in order to enable sufficient guard rail stability corresponding to or at least approximating the stability of a known steel guard rail. On the other hand, the spacer block with the indicated dimensions enables an economical use of materials.
[0027] In an embodiment of the present invention, the guard rail also includes a plurality of posts compliant with RAL-RG 620. Accordingly, the posts of the guard rail according to the present invention are identical to the posts of a known steel guard rail, thereby enabling the steel guard rail to be easily replaced with the guard rail according to the present invention.
[0028] In an embodiment of the present invention, the guard rail can be fixed to the post with screws. The screws are arranged particularly at the location where the spacer block is disposed within the guard rail, thereby enabling the screw joints to transmit an increased force.
[0029] Without limiting the general concept of the invention, the invention will be described in detail with reference to the drawings. In this regard,
Brief Description of the Drawings
[0030] [Figure 1] Figure 1 shows a perspective view of a guardrail. [Figure 2] Figure 2 shows a plan view of the guardrail. [Figure 3] Figure 3 shows a cross-section of the guardrail. [Figure 4] Figure 4 shows the back of the guardrail. [Figure 5] Figure 5 shows a connecting member according to the first embodiment. [Figure 6] Figure 6 shows a connecting member according to the second embodiment. [Modes for carrying out the invention]
[0031] Embodiments of the guardrail 2 will be described in more detail with reference to Figures 1, 2, 3, and 4. Identical components of the invention are indicated by the same reference numerals in all drawings.
[0032] The guardrail 2 includes a first outer layer 21 facing the road and a second outer layer 22 facing away from the road. The outer layers 21 and 22 are made of wood or a wood-based material, such as laminated wood, and in some embodiments, the adhesive joints are arranged horizontally, i.e., parallel to the road surface.
[0033] Spacer blocks 25 and 26 are provided between the outer layers 21 and 22, which are spaced apart. These spacer blocks 25 and 26 are also made of wood or wood-based material, such as glued wood, laminated wood, laminated veneer, or veneer strands. In one embodiment of the present invention, the outer layers 21 and 22 and the spacer blocks 25 and 26 can be joined by adhesive bonding.
[0034] The guardrail formed in this manner is attached to multiple support posts 3. The support posts 3 are either screwed to a foundation connected to the ground with flanges, or driven into the ground and connected to the ground. The connection between the guardrail 2 and the support posts 3 is made, for example, by screwing the support posts 3 to the flanges 31.
[0035] In one embodiment of the present invention, the outer side (29) of the second outer layer (22) may be designed and intended to be connected to at least one support post (3). The proposed guardrail 2 is thus positioned entirely on the road side of the support post (3), with the first outer layer (21) facing the road and the second outer layer (22) facing away from the road towards the support post (3). Thus, the support post (3) is not located between the first outer layer (21) and the second outer layer (22).
[0036] As shown in Figure 1, the guardrail 2 is composed of multiple sub-sections. Figure 1 shows two sub-sections, 2a and 2b. Depending on the structural requirements and the desired length of the guardrail, it is naturally possible to have multiple sub-sections.
[0037] Each section of the guardrail 2 has a larger spacer block 26 at each end. The length of this spacer block 26 is measured along the longitudinal direction of the guardrail 2 and is greater than the length of the intermediate spacer block 25. For example, the length of the outer spacer block 26 can be between 300 mm and approximately 600 mm. The length of the intermediate spacer block 25 can be between approximately 200 mm and approximately 300 mm.
[0038] Each spacer block 26, positioned at both ends, is provided with at least one hole 27. In the illustrated embodiment, two holes 27 are provided. In other embodiments of the present invention, the number of holes 27 may be more or less than 1 to about 6.
[0039] As shown in Figure 2, the connecting member 1 is inserted into the hole 27. Each of the connecting members 1 has a first longitudinal section 11, a second longitudinal section 12, and a third longitudinal section 13. The first and third longitudinal sections 11 and 13 are housed within the spacer block 26 and are designed to be screw-connected to nuts 15 at their ends. The second longitudinal section 12 connects the first longitudinal section 11 and the third longitudinal section 13 to each other, connecting the partial sections 2a and 2b in a tensile-resistant manner.
[0040] During a vehicle collision, the connecting member 1 is capable of plastic deformation, thereby preventing the occurrence of a force peak. At the same time, the guardrail of the present invention functions as a tension band that absorbs impact energy via the support 3 and transmits it to the ground.
[0041] As shown in Figure 3, the outer layers 21 and 22 have a large height measured vertically and a relatively small width measured horizontally. In some embodiments, this height can be in the range of approximately 280 mm to approximately 370 mm. This allows for easy replacement of known steel B-profile guardrails with the guardrails of the present invention, on the one hand, and ensures a relatively large impact surface, thereby avoiding the occurrence of force peaks in colliding vehicles. The width of the outer layers can be in the range of approximately 50 mm to approximately 90 mm, or approximately 70 mm to approximately 90 mm, which enables both low material usage and high tensile strength. The distance between the outer layers, i.e., the width of the spacer blocks, can be in the range of approximately 90 mm to approximately 140 mm, or approximately 110 mm to approximately 140 mm.
[0042] As further shown in Figure 3, the height of the outer layer 21 on the road side is approximately 10 mm to 50 mm higher than the height of the outer layer 22 on the side away from the road. This creates a sloping upper edge, which prevents the accumulation of puddles and allows rainwater to drain without obstruction.
[0043] Figure 5 shows the connecting member 1 in the first embodiment in more detail. The connecting member 1 has a first longitudinal section 11, a second longitudinal section 12, and a third longitudinal section 13. As described above, the first and third longitudinal sections 11 and 13 are designed to be inserted into holes 27 in spacer blocks 26 at the ends of the longitudinal sections 2a and 2b of the guardrail 2. For this purpose, the first and third longitudinal sections 11 and 13 may have a circular cross-section in at least part and may be provided with male threads at at least at the ends. Depending on the embodiment of the present invention, the diameters of the first and third longitudinal sections 11 and 13 may be in the range of about 20 mm to about 30 mm.
[0044] The second longitudinal section 12 connects the first longitudinal section 11 and the third longitudinal section 13. The cross-sectional area of the second longitudinal section 12 can correspond to approximately 50% to 80% of the cross-sectional areas of the first longitudinal section 11 and the third longitudinal section 13. This provides a weak point in the connecting member at the joint of the two sections 2a and 2b of the guardrail 2. This makes it possible to absorb energy through the plastic deformation of the connecting member 1. By appropriately designing the cross-section of the second longitudinal section 12, the degree of plastic deformation that occurs during a side collision by a vehicle can be precisely controlled.
[0045] In embodiments of the present invention, the connecting member 1 is integrally molded. For example, the length can be adjusted by cutting a corresponding semi-finished product. The first and third longitudinal sections 11 and 13 can be externally threaded by rolling, cutting, or turning. The second longitudinal section 12 can be manufactured by machining. In the first embodiment shown in Figure 5, the second longitudinal section 12 is manufactured by turning, and stress concentration at the transition to the first and third longitudinal sections 11 and 13 can be avoided by radius or chamfering.
[0046] A second embodiment of the connecting member 1 will be described in more detail with reference to Figure 6. Since identical components of the invention are indicated by the same reference numerals, the following description will be limited to essential differences. In the second embodiment shown in Figure 6, the reduction of the cross-section in the second longitudinal section 12 is achieved by providing a milled recess 125 that results in intentional material removal. In some cases, the milled recess 125 may be smaller than that shown in Figure 6. In some embodiments of the present invention, the milled recess 125 may extend across the entire depth of the cross-section in the second longitudinal section, forming a through hole. In some embodiments of the present invention, the milled recess 125 may only partially penetrate the cross-section in the second longitudinal section, forming a depression or pocket. This type of milled recess can also be used to specifically adjust the cross-sectional shape of the second longitudinal section, and consequently the degree of plastic deformation or fracture load. The milled recess can be combined with a symmetrical reduction of the preceding cross-section by turning.
[0047] Naturally, the present invention is not limited to the illustrated embodiments. Therefore, the above description should be considered descriptive rather than restrictive. The following claims should be understood to mean that the described features are present in at least one embodiment; this does not preclude the presence of other features. Where “first” and “second” embodiments are defined in the claims and the above description, this designation is used to distinguish two similar embodiments without establishing priority.
Claims
1. A guardrail (2) comprising a first outer layer (21), a second outer layer (22) spaced apart from the first outer layer, and a plurality of spacer blocks (25, 26) positioned between the outer layers (21, 22), wherein the guardrail (2) is divided into at least two subsections (2a, 2b) along its longitudinal direction, the two subsections are joined by at least one connecting member (1), and the at least one connecting member (1) is a first A guardrail (2) having a longitudinal section (11), a second longitudinal section (12), and a third longitudinal section (13), wherein the first and third longitudinal sections (11, 13) are designed to connect to the respective subsections (2a, 2b) of the guardrail (2), the second longitudinal section (12) connects the first longitudinal section (11) and the third longitudinal section (13), and the outside (29) of the second outer layer (22) is designed to connect to at least one support post (3).
2. A guardrail according to claim 1, characterized in that the cross-sectional area of the second longitudinal section (12) of the connecting member (1) corresponds to approximately 50% to approximately 80% of the cross-sectional areas of the first and third longitudinal sections (11, 13).
3. A connecting member according to claim 1 or 2, wherein the first and third longitudinal sections (11, 13) of the connecting member (1) have a circular cross-section, and / or A connecting member characterized in that the first and / or third longitudinal sections (11, 13) of the connecting member (1) are at least partially provided with external threads.
4. A connecting member according to any one of claims 1 to 3, characterized in that the first longitudinal section (11), the second longitudinal section (12), and the third longitudinal section (13) of the connecting member (1) are integrally molded, and the second longitudinal section (12) is manufactured by machining.
5. A guardrail according to any one of claims 1 to 4, wherein the first outer layer (21) and / or the second outer layer (22) and / or the plurality of spacer blocks (25) include or are composed of wood or a wood-based material, A guardrail characterized in that the first outer layer (21) and / or the second outer layer (22) and / or the plurality of spacer blocks (25) include, or are composed of, adhesive wood and / or laminated wood and / or laminated veneer and / or laminated strand material.
6. A guardrail according to any one of claims 1 to 5, wherein the spacer block (26) at the end of the partial section (2a, 2b) has at least one longitudinally extending hole (27) into which the first or third longitudinal section (11, 13) of the connecting member (1) is guided.
7. A guardrail according to claim 6, characterized in that the hole (27) is about 5% to about 25%, or about 10% to about 20%, or about 11% to about 16%, larger than the diameter of the first and third longitudinal sections (11, 13) of the connecting member (1).
8. A guardrail according to claim 6 or 7, wherein the hole (27) is designed as a through hole in the spacer block (26), the first and third longitudinal sections (11, 13) of the connecting member (1) are longer than the extension of the spacer block (26), and the first and third longitudinal sections (11, 13) are screw-connectable at the exit of the spacer block (26).
9. A guardrail according to any one of claims 1 to 7, wherein the first outer layer (21) and / or the second outer layer (22) have a thickness measured horizontally of about 50 mm to about 200 mm, or about 60 mm to about 100 mm, or about 70 mm to about 90 mm, and / or A guardrail characterized in that the first outer layer (21) and / or the second outer layer (22) have a height measured in the vertical direction of approximately 280 mm to approximately 370 mm, or approximately 295 mm to approximately 350 mm.
10. A guardrail according to any one of claims 1 to 9, characterized in that the height of the first outer layer (21), measured in the vertical direction, is about 10 mm to about 50 mm greater than the height of the second outer layer (22).
11. A guardrail according to any one of claims 1 to 10, wherein the spacer blocks (25, 26) have a vertical height corresponding to the height of the outer layers (21, 22), and / or The spacer blocks (25, 26) have a thickness measured in the horizontal direction of the guardrail of approximately 90 mm to approximately 150 mm, or approximately 90 mm to approximately 140 mm, or approximately 110 mm to approximately 130 mm, and / or A guardrail characterized in that the spacer blocks (25, 26) have a length measured in the longitudinal direction of the guardrail of approximately 200 mm to approximately 300 mm, or approximately 300 mm to approximately 600 mm.
12. A guardrail according to any one of claims 1 to 11, further comprising a plurality of support posts (3) conforming to RAL-RG 620.
13. A method for installing guardrails, The steps include attaching at least two support posts (3), The procedure includes the step of fixing the guardrail (2) described in any one of claims 1 to 12 to the support post (3), The guardrail (2) is divided into at least two subsections (2a, 2b) along its longitudinal direction, and the subsections are joined by at least one connecting member (1). The outside (29) of the second outer layer (22) is connected to the support column (3), a method for installing a guardrail.
14. In the method according to claim 13, the at least one support column (3) conforms to RAL-RG 620 and / or A method for installing a guardrail, characterized in that the guardrail (2) is fixed by screws.
15. In the method according to claim 13 or 14, A method for installing a guardrail, further comprising the step of machining chamfering at least one end of at least one subsection (2a, 2b) and / or at least one spacer block (26) at the end of the subsection (2a, 2b).