KR101738549B1 - Plastic Guard-Rail - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic guardrail which is formed of a synthetic resin material and is laterally fixed to a vertical post. The guard rail according to the present invention includes an inner structure having an outer structure having a plurality of inwardly directed first ribs and a fitting groove into which the first ribs can be inserted and inserted between a plurality of outwardly directed second ribs, And an intermediate layer for connecting ends of the first and second ribs so that the ends of the first ribs are positioned at the entrance of the fitting groove. In this structure, when an impact is applied to the outer structure, the intermediate layer is broken and the first rib is forcedly inserted into the fitting groove, thereby relieving the impact.

Description

Plastic Guard-Rail}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a guardrail for protecting a vehicle, and more particularly, to a plastic molded guardrail designed to effectively cope with an external impact.

Generally, a guardrail is a road facility installed along a roadway for indicating that the road is bounded and preventing the vehicle from departing. Such guard rails are required to have a high impact strength for preventing the vehicle from being detached when the vehicle is collided, while at the same time requiring a characteristic capable of absorbing impact applied to the vehicle and the guard rail. This demand is particularly concerned with the protection of the driver and occupant.

Traditionally, guard rails are metal plates pressed in a continuously curved shape and are continuously positioned and fixed in a rail post suitably positioned along the roadway. However, this metal guard rail has a problem of poor workability due to inconvenience and danger of handling, and it has a problem of corrosion as well as not having a buffering ability capable of absorbing impacts. Thus, in recent years, proposals have been made such that the material is made of plastic or a buffer element is added thereto.

For example, Utility Model Registration Nos. 180108 and 316363 disclose guard rails that are adapted to mitigate impact in the event of a vehicle collision by attaching a shock-absorbing material molded with a polymer to the surface of a metal plate. However, in this case, it takes a considerable amount of time and cost to manufacture and attach the guard rails, so that the productivity is significantly reduced.

In addition, in the Utility Model Registration No. 308889, there is disclosed a guardrail molded simply as synthetic resin or FRP, and there are various proposals in which a fastening structure or a reflective structure is added to a guard rail having a similar material. In this case, There is a problem in that there is no particular consideration for the strength, stiffness or buffering functions of the motor. What is proposed is to form an air layer inside the guard rail.

Resins 466411, 897583, 1312933, and 2010-109080 use synthetic resin or resin, but an air layer is formed therein and each layer is formed into a substantially (-) shape, a V shape or a W Type linear ribs or honeycomb ribs connected to each other. This structure will have buffering effect as compared to the simple plate type guard rail described above.

However, there are two important issues here.

First, the internal structure of the guardrail including the air layer and the ribs is limited to the shape but does not act actively on the external impact. Thus, when an external impact is applied to the guard rail, each layer is easily broken down in order, and the internal structure and shape of the guard rail do not act to buffer and relax. Thus, although the air layer and the ribs provide the cushioning properties of the guard rails, the effect is only marginal.

Second, as described above, when an external impact is applied to the guard rail of this structure, each layer is easily broken down in succession. At this time, the plastic fragments of the destroyed guardrail are scattered and scattered in all directions, 3 additional damage is likely to occur. Thus, in reality, a structural improvement is needed to prevent the impacted guardrail from generating fragments as much as possible, but no countermeasures have been taken at all.

The present invention has been proposed in order to solve the problem of the guard rail according to the above-mentioned prior art. SUMMARY OF THE INVENTION It is an object of the present invention to provide a guard rail which can more effectively mitigate an impact through an active action for absorbing an external impact. It is another object of the present invention to provide a guard rail configured so that fragments of a guard rail due to the impact are not possibly generated.

The guard rails of the present invention are based on plastic guard rails made of synthetic resin and fixed transversely to the vertical posts.

Structurally:

An outer structure comprising a surface layer providing a contact surface against an external impact and a plurality of first ribs formed inwardly protruding from the surface layer;

A plurality of second ribs protruding outwardly from the rear layer and a fitting groove formed in such a manner that the first ribs can be closely inserted into the gap between the adjacent second ribs, Internal structure;

An intermediate layer for connecting ends of the first and second ribs so that the ends of the first ribs are located at the entrance of the fitting groove when the external structure and the internal structure are disposed opposite to each other;

.

When an impact is applied to the surface layer, the intermediate layer is broken and the first rib is forcedly inserted in the fitting groove, and the impact is relieved by the frictional resistance continuously provided in the insertion process.

Preferably, the guard rail of the present invention comprises:

A synthetic resin foam for shock absorption to be filled in the fitting groove;

.

Preferably, the outer surface of the first rib and the inner wall of the fitting groove have a corresponding ridge-groove structure.

Preferably, a PC resin material is applied to the outer structure 20 as a material of the thermoplastic engineering plastic resin, and a material selected from the engineering plastic resin and HDPE (High-Density Polyethylene) In a weight ratio of 30 to 50: 70 to 50, is applied.

The foam is a conventional polyethylene foam.

According to the guard rail of the present invention, when an impact is applied to the surface layer of the outer structure, the middle layer is broken and the first rib is forcedly inserted into the fitting groove of the inner structure. In this insertion process, frictional resistance is continuously provided, and the inner and outer structures are pressed together and integrally joined. Therefore, the impact applied can be absolutely mitigated, and the possibility of generating guardrail fragments after impact can be significantly reduced.

In a preferred embodiment, the foam resiliently absorbs the impact corresponding to the front end of the first rib, and the rubbing projection-groove structure provides a stronger frictional resistance in succession between the first rib and the fitting groove. Therefore, it has the effect of reducing the impact applied and reducing the occurrence of debris.

1 is a perspective view of a guardrail according to the present invention;
Fig. 2 is a state in which the guard rail according to the present invention is used. Fig.
3 is an enlarged cross-sectional view of the portion 'A' of FIG. 1;
4 is a sectional view for explaining the action of a guard rail according to the present invention;
5 is an enlarged view of a portion 'B' in FIG. 2;

The features and operation effects of the plastic guard rail of the present invention (hereinafter, guard rail) described or not described above will become more apparent from the following description of the embodiments with reference to the accompanying drawings. In the figure, the guard rail according to the invention is indicated by the reference numeral 10.

1 and 2, a guard rail 10 according to the present invention is a plate extending longitudinally in a transverse direction with longitudinal direction waves, and at the end thereof, another guard rail 10 having the same structure and shape, Lt; / RTI > A bolt 12 passing through each of the fastening holes 11 is formed in the rear surface of the guard rail 10 so that two bolts And a common washer member 13 for connecting the both guard rails 10 by receiving the guide rails 12.

In the drawing, reference numerals 14 and 15 denote fasteners and fixing bolts formed to mount the guard rail 10 according to the present invention on the roadside rail post P. The plate shape and the connection structure of the guard rail 10 described above are not special to the present invention, and the present invention is not limited thereto. For example, a separate bracket structure may be used for connecting the guard rails 10 and fixing the posts P.

3, the guard rail 10 of the present invention is based on a plastic guard rail formed of a synthetic resin material and fixed laterally to the vertical post P, and is designed as a multiple structure, (P) side inner structure 30 and a middle layer (not shown) disposed between the outer structure 20 and the inner structure 30 to connect the two structures 20, 40).

The guard rail 10 as described above is formed in a waveform as a whole, but may be formed in a curved shape or a planar shape.

The outer structure 20 includes a surface layer 21 providing a contact surface to the outside and a plurality of first ribs 22 protruding inwardly from the surface layer 21. The inner structure 30 also includes a backside layer 31 providing a fixation surface for the post P and a plurality of second ribs 32 protruding outwardly from the backside layer 31 .

The inner structure 30 includes a fitting groove 33 formed between the adjacent second ribs 32 so that the first ribs 22 can be closely inserted and inserted. Preferably, the outer structure 20 also includes a fitting groove 23 formed between the first ribs 22 adjacent to each other so that the second ribs 32 can be closely inserted into the fitting groove 23, .

It can be seen that the outer diameter of the first rib 22 and the inner diameter of the fitting groove 33 are almost equal to each other due to the term ' If it is not set, the insertion may become difficult or the first rib 22 or the second rib 32 may be broken. Therefore, in order to guide the proper insertion into the fitting groove 33, the first rib 22 is formed in the form of a pointed or rounded shape.

The first ribs 22 and the second ribs 32 are formed radially from the center of the corrugations in the longitudinal direction corrugation sections D1 and D2 of the guard rail 10. This configuration makes it possible to place the impact transmission direction and its corresponding buffer means 22, 33, 34 on a straight line (C-C ') against impact at any point on the surface of the outer structure 20, The insertion of the first rib 22 into the fitting groove 33 is guided not only to improve the directionality and efficiency of the buffering. For example, if an impact is applied to the apex of the corrugation, the corrugation is gradually lowered, so that proper insertion of the first rib 22 into the fitting groove 33 can be naturally accomplished.

The intermediate layer 40 is a means for maintaining the overall shape of the guard rail 10 and is a means for holding the first rib 22 and the second rib 22 between the mutually opposed outer structure 20 and the inner structure 30. [ 32 are connected to each other to form the two structures 20-30 integrally. Specifically, the intermediate layer 40 is formed so that when the outer structure 20 and the inner structure 30 are opposed to each other, the end of the first rib 22 is positioned at the inlet of the fitting groove 33, And the end portions of the ribs 22 and the second ribs 32 are connected to be shifted from each other.

Although the intermediate layer 40 is shown as one layer in which the ends of the first rib 22 and the second rib 32 are in contact with the upper surface and the lower surface, respectively, Can be understood as a line extending along the ends of the first rib 22 and the second rib 32 that are contact-connected to each other at the edges of the end portions. Here, the intermediate layer 40 forms one longitudinal-directional waveform line by a continuous 'V' character or round corresponding to the end shape of each rib 22 and 32.

In the present invention, the guard rails 10 are molded of a thermoplastic resin. Preferably, the outer structure 20 and the intermediate layer 40 are made of a material having a high strength so as to enhance impact resistance , The inner structure 30 is formed integrally with at least a material having a lower strength than the outer structure 20 in consideration of the inner buffering property and the water-solubility of the first rib 22.

PC, POM (polyacetyl), PBT (polybutylene terephthalate), and MPPO (modified polyphenylene), which are known to have strength of an extent that is used for interior and exterior parts of an automobile, Oxide), and PET (EP.VC). As a material of the internal structure 30, a general-purpose plastic resin selected from among PE, PP, PVC, PS, ABS, AS (acrylonitrile styrene copolymer) and MBS (methacrylic resin)

However, even the internal structure 30 is required to have a strength close to that of the engineered resin used for the guard rail 10, which is considerably impacted as a whole. As a preferable example, PC (Polycarbonate) resin having the highest impact strength among the thermoplastic resin and engineering resin is applied as the material of the external structure 20. As the material of the internal structure 30, the above-mentioned E-P.V.C. Resin material obtained by mixing HDPE (High-Density Polyethylene) with a material selected from resin is applied.

At this time, E-P.V.C. The resin does not exceed the weight of the HDPE resin, preferably 30 to 50:70 to 50 by weight.

3 and 4, when an external impact R on the guard rail 10 impacts the surface layer 21 of the external structure 20, the external structure 20 and the internal structure 30 The first rib 22 is inserted into the fitting groove 33 while the intermediate rib 40 connecting the first rib 22 and the fitting groove 33 The impact is relaxed by the frictional resistance between them.

Preferably, the guard rail of the present invention further includes a foam-absorbing synthetic resin foam 34 in the form of a foam to be filled in the fitting groove 33 in order to further reinforce the relief of the impact. Structurally, the foam 34 elastically absorbs the impact corresponding to the front end of the first rib 22 in front. Preferably, the foam 34 is a conventional polyethylene foam.

Here, the filled foamed body 24 serves to elastically support the adjacent second ribs 32 on the left and right sides in addition to corresponding to the impact directly.

Preferably, the first rib 22 includes a plurality of friction protrusions 24 formed on an outer surface thereof, and the fitting groove 33 is formed in an inner wall of the groove to correspond to the groove 24 corresponding to the friction protrusion 24 35). The structure corresponding to the rubbing projection-recesses (24, 35) provides a stronger frictional resistance between the first rib (22) and the fitting recess (33), while at the same time suppressing the force to be elastically stretched in the opposite direction, 34 are firmly disposed on the inner wall of the fitting groove 33.

In the above structure, the impact resistance of the guard rail 10 is ensured by the external structure 20 of the material described above. The buffering characteristics of the guard rail 10 are ensured by the structure of the inner structure 30 of the material, the interaction between the ribs 22 and 32, the structure corresponding to the foam 24 and the ridge- And reinforced. Reference numerals 25 and 36 denote common buffer holes for forming the surface layer 21 of the outer structure 20 and the back layer 31 of the inner structure 30 in the longitudinal direction, respectively.

Meanwhile, the external structure 20 and the internal structure 30 are pressed together and firmly coupled with each other while the first rib 22 is inserted into the fitting groove 33 at the same time as the mitigation operation according to the impact. Therefore, even if the guard rail 10 is damaged due to the impact, the degree of debris and scattering of the guard rail 10 is considerably smaller than that in the case where the debris and scattering are scattered and the second and third damages It can be prevented.

Referring to FIG. 5, the guard rail 10 has a fixing hole 14 formed in the surface layer 21 of the external structure 20 through the second rib 32. Actually, the guard rail 10 is fixed to an element such as a post P based on the internal structure 30. If the fixing bolt 15 or the like passes through the fitting groove 33 having a hollow shape, The support base of the base 10 is weakened. Therefore, preferably, the fixing hole 14 of the guard rail 10 penetrates the second rib 32 of the internal structure 30. [

10. Guard rail
11. Fastening ball 12. Bolt
13. Washer member 14. Fixing hole
15. Fixing Bolt
20. External Structure
21. Surface layer 22. First rib
23. Fitting groove 24. Friction projection
25. Air hole
30. Internal structure
31. Back layer 32. Second rib
33. Fitting groove 34. Foam
35. Groove 36. Air hole
40. Middle-
P. Post
D1, D2. Waveform section

Claims (11)

A plastic guardrail formed of a synthetic resin material and fixed in a transverse direction to a vertical post (P)
An outer structure (20) comprising a surface layer (21) providing a contact surface for external impact and a plurality of first ribs (22) formed inwardly protruding from the surface layer (21);
A plurality of second ribs 32 formed outwardly protruding from the back layer 31 and a plurality of second ribs 32 formed between the second ribs 32 adjacent to each other, (30) including a fitting groove (33) formed so that the first rib (22) can be closely inserted into the fitting hole (33);
When the outer structure 20 and the inner structure 30 are disposed opposite to each other, the first and second ribs 22 and 32 are arranged such that the end of the first rib 22 is positioned at the entrance of the fitting groove 33 An intermediate layer 40 for connecting the ends of the electrodes 40 to each other;
/ RTI >
When the impact is applied to the surface layer 21, the intermediate layer 40 is broken and the first rib 22 is forcedly inserted into the fitting groove 33 to alleviate the impact thereof;
Characterized in that the plastic guard rail
The method according to claim 1,
Wherein the guard rail further comprises a shock absorbing synthetic resin foam (34) filled in the fitting groove (33).
The method according to claim 1,
Characterized in that the outer structure (20) comprises a fitting groove (23) formed between adjacent first ribs (22) so that the second rib (32) .
The method according to claim 1,
Wherein the first rib (22) is formed in the form of a pointed or rounded end.
The method according to claim 1,
Wherein an outer surface of the first rib (22) and an inner wall of the fitting groove (33) have a rubbing projection-groove (24, 35) structure corresponding to each other.
The method according to claim 1,
Wherein the first rib (22) and the second rib (32) are formed radially from the center of the corrugation in the longitudinal-direction corrugation sections (D1, D2) of the guard rail (10).
The method according to claim 1,
The intermediate layer 40 may be a layer in which each end of the first rib 22 and the second rib 32 is in contact with the upper surface and the lower surface, Is a line extending along an end of the rib (22) and the second rib (32).
8. The method of claim 1 or 7,
Characterized in that the intermediate layer (40) forms one longitudinal-direction corrugated line by a continuous 'V' character or round corresponding to the end shape of each rib (22,32).
The method according to claim 1,
PC, POM (polyacetyl), PBT (polybutylene terephthalate), MPPO (polyethylene terephthalate), or the like is used as the material of the internal structure 30. The material of the external structure 20 is a PC resin material in the thermoplastic engineering plastic resin. (Modified polyphenylene oxide) and PET, and HDPE (High-Density Polyethylene) at a weight ratio of 30 to 50: 70 to 50, is applied to the plastic guardrail.
3. The method of claim 2,
Characterized in that the foam (34) is a conventional polyethylene foam.
The method according to claim 1,
Wherein the guard rail has a fixing hole formed in a surface layer of the outer structure through a second rib.

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