CZ36332U1 - Retaining system intended for stopping a truck weighing up to 30 t - Google Patents

Description

Restraint system designed to stop a truck weighing up to 301

Technical area

The technical solution concerns a restraint system designed for stopping an N3 truck according to the CWA 16221:2010 standard, i.e. a concrete barrier to prevent unauthorized entry of a truck into a protected area.

State of the art

Elongated concrete blocks of various shapes are used to limit the movement of land vehicles. These include concrete barriers, usually coupled, which limit the movement of the vehicle to the sides, and barriers placed in the path of the vehicle. These concrete blocks are commonly formed by a column, from the lower part of which wedge-shaped protrusions extend to both sides, while the block is arranged symmetrically along the vertical longitudinal plane. In the event of a frontal impact with such an obstacle, the block will be displaced and the vehicle, if its condition allows, can back up and drive away.

Barriers of the above design include a concrete block described in US 4661010 A which has a substantially triangular profile with side walls shaped to guide vehicle wheels that come into contact with the block.

US 7144186 B1 discloses a massive safety barrier formed by coupled concrete prisms, through which steel reinforcements run along the length, the ends of which projecting on the sides are connected by bolts.

The technical solution aims to design concrete barriers that, when interconnected, form a system for stopping and restraining vehicles weighing up to 30 tons.

The essence of the technical solution

The above task is fulfilled by a restraint system intended for stopping a truck, consisting of elongated connectable concrete blocks to be placed on the ground, particularly perpendicular to the direction of movement of the vehicle, which are formed by a web, from the lower part of which a lower projection extends against the direction of movement of the vehicle and from the upper part of which an upper projection extends in the direction of movement of the vehicle, wherein both projections of the web of the concrete block have a wedge-shaped profile, wherein the lower side of the web and the lower side of the lower projection lie in the same plane and also the upper side of the web and the upper side of the upper projection lie in the same plane and both planes are parallel. The essence of the restraint system lies in the fact that a series of triangular blades extend from the lower projection against the direction of movement of the vehicle.

The knives are preferably mounted on rails anchored in the front wall of the lower projection.

Concrete blocks have horizontal connecting eyes anchored on both sides to connect adjacent blocks to each other by inserting a pipe or rod.

The connecting eyes on each side may be arranged in a vertical row, with the connecting eyes on one side being offset in height from the connecting eyes on the other side.

In a preferred embodiment, the connecting eyes are formed in a vertical row of plates through which an anchor rod or tube passes, with opposing anchor rods being connected by tie rods and with the plates, anchor rods and tie rods being embedded in the block material.

- 1 CZ 36332 UI

To increase durability and reduce the amount of possible fragments upon impact, the surface of the block can be provided with an anti-fragmentation layer on a polymer basis.

Clarification of drawings

The technical solution will be further explained with the help of a drawing, in which Fig. 1 is a side view of a preferred embodiment of one element - a concrete block - of the retaining system, Fig. 2 is the block according to Fig. 1 in axonometric projection and Fig. 3 is the anchoring system of the connecting eyes.

Examples of implementing a technical solution

The restraint system is formed by elongated concrete blocks - see Fig. 2 - to be placed on the ground, particularly perpendicular to the direction of vehicle movement. The concrete block is formed by a pillar 1, from the lower part of which a lower projection 2 extends against the direction S of vehicle movement and from the upper part of which an upper projection 3 extends in the direction S of vehicle movement. Both projections 2, 3 of the pillar 1 have a wedge-shaped shape. The lower side of the pillar 1 and the lower side of the lower projection 2 lie in one plane Ri and the upper side of the pillar 1 and also the upper side of the upper projection 3 lie in one plane R2, with both planes Ri, R2 being parallel. A series of triangular blades 4 extend from the lower projection 2 against the direction S of vehicle movement, which are mounted on rails 5 anchored in the front wall of the lower projection 2.

The concrete block is provided with means for connecting to an adjacent block. For this purpose, horizontal connecting eyes 6 are anchored on both sides of the block. The connecting eyes 6 are arranged in a vertical row, with the connecting eyes 6 on one side being offset in height from the connecting eyes 6 on the other side. If two blocks are brought together by their side walls, a channel is created for connecting the adjacent blocks by inserting a tube 7. The connecting eyes 6 are formed in a vertical row of plates 8, through which an anchor rod 9 passes. The opposing anchor rods 9 are connected by rods 10. The plates 8, anchor rods 9 and rods 10 are embedded in the block material.

To facilitate handling and to prevent water from accumulating on one side of the retention system during rain, the concrete blocks are provided with a transverse channel 11 on the bottom for water flow. The surface of the block may be provided with an anti-fragmentation layer on a polymer basis.

An exemplary concrete block has a weight of 4527 kg, a length of 2000 mm and a height of 1500 mm. The block is made of reinforced cement composite. Its unique shape is designed so that, upon impact, the kinetic energy of the vehicle is partially converted into potential energy. This is achieved by a controlled tilting of the block, the lower projection 2 of which is then locked under the front part of the vehicle chassis, which is thereby lifted and immobilized. During this movement, the blades 4 cut the vehicle's tires and make it impossible to drive off, even if it is freed from the barrier. The friction of the upper projection 3, which comes into contact with the ground, then contributes to the absorption of the vehicle's kinetic energy.

The final shape of the block is the result of extensive numerical simulations aimed at optimizing the shape from the perspective of rollover upon impact, while maintaining stability at rest.

The functional sample was prepared by casting in a steel mold. It was then transported to the test facility, where it was subjected to an impact test according to the CWA 16221:2010 standard. The barrier was tested in accordance with the standard at a vehicle speed of 48 km/h. The barrier easily withstood the impact of a vehicle weighing 301. No critical points on the barrier were identified.

Claims (6)

1. A restraint system intended for stopping a truck, consisting of elongated connectable concrete blocks to be placed on the ground, particularly perpendicular to the direction (S) of movement of the vehicle, characterized in that the blocks consist of a stand (1), from the lower part of which a lower projection (2) extends against the direction of movement of the vehicle and from the upper part of which an upper projection (3) extends in the direction of movement of the vehicle, wherein both projections (2, 3) of the stand (1) of the concrete block have a wedge-shaped profile, wherein the lower side of the stand (1) and the lower side of the lower projection (2) lie in one plane (Ri) and also the upper side of the stand (1) and the upper side of the upper projection (3) lie in one plane (R2) and both planes (Ri, R2) are parallel, wherein a series of triangular blades (4) extend from the lower projection (2) against the direction (S) of movement of the vehicle. 2. A restraint system according to claim 1, characterized in that the knives (4) are mounted on rails (5) anchored in the front wall of the lower projection (2). 3. A retaining system according to claim 1 or 2, characterized in that the concrete blocks have horizontal connecting eyes (6) anchored on both sides for interconnecting adjacent blocks by inserting a tube (7) or rod. 4. A restraint system according to claim 3, characterized in that the connecting eyes (6) on each side are arranged in a vertical row, the connecting eyes (6) on one side being offset in height from the connecting eyes (6) on the other side. 5. A restraint system according to claim 4, characterized in that the connecting eyes (6) are formed in a row of plates (8) through which an anchor rod (9) or tube passes, wherein the opposing anchor rods (9) are interconnected by rods (10) and wherein the plates (8), anchor rods (9) and rods (10) are embedded in the block material. 6. A restraint system according to any one of claims 1 to 5, characterized in that the blocking surface is provided with an anti-fragmentation layer on a polymer basis.