RU2800181C1 - Anti-ram device - Google Patents

Abstract

FIELD: security.

SUBSTANCE: invention relates to devices that prevent unauthorized entry of vehicles into the territory or exit from the territory of a protected facility, including by means of a ram at the entrance. The anti-ram device consists of right, left, middle posts and a barrier beam, all the posts and the barrier beam are hollow and comprise steel ring ropes inside, comprising an electric drive for moving the barrier beam in a horizontal position, while the left and middle posts are located side by side and interconnected by ties, the ends of the ropes are connected by rope clamps, there are hooks on the barrier beam on the right side, attached to the locks on the right post, stops on the barrier beam on the left side, put on supports on the left post, which, when ramming, together with the ropes in the barrier beam and in racks form a single system "fishing net cell", which reliably catches the transport going to the ram.

EFFECT: improved stopping power of the anti-ram device, including an increase in strength characteristics.

5 dwg, 1 tbl

Description

The invention relates to devices that prevent unauthorized entry of vehicles into the territory or exit from the territory of a protected facility, including by means of a ram at the entrance.

From the prior art, utility model No. 131741 (02/08/2013) is known, which refers to devices designed to create an obstacle to the movement of vehicles in an attempt to unauthorized entry into or exit from the territory of a protected facility. The technical task is to increase the reliability of the device, reduce the mass of the anti-ram barrier, simplify the design while maintaining high reliability in operation, ensuring ease of assembly and installation at the facility. In anti-ram barrier containing supports with trunnions, an electric drive, a barrage hollow beam with power cables located inside, one end of which is mounted on an axis fixed on the frame with the possibility of turning the beam in a vertical plane, according to the proposed utility model, the electric drive is made in the form of a linear movement drive, the barrage beam at the axle attachment point is equipped with a bent lever, on which the linear movement drive is hinged. The bases of the steel supports and the frame are rigidly fixed to the foundation blocks. The linear motion drive is equipped with a protective cover with a locking device that prevents unauthorized access to the drive. The cable system is made in the form of at least nine turns of a power cable and is installed in the vertical plane of the beam. The technical result consists in increasing the reliability of the device, in increasing the number of "lifting-lowering" cycles, which ensures an increase in the service life of the device. The cable system, made in the proposed way, provides a tensile strength of at least 54 tons of static loads. With the help of a cable system, the entire anti-ram barrier is an insurmountable obstacle for vehicles weighing up to 3.5 tons, moving at a speed of 40 km / h. The anti-ram barrier has anti-ram properties in two directions of vehicle movement, which expands the operational capabilities of the device.

The closest to the claimed technical solution is utility model No. 171932 (February 17, 2017), which refers to means blocking unauthorized passage, including by means of a ram, to the territory of protected objects, namely, to a retractable anti-ram barrier with increased resistance to shock loading. The barrier contains the main and receiving power racks and a beam located between them with the possibility of moving in the horizontal direction. The main power rack has a mechanism for moving the said beam, and the receiving power rack has a locking mechanism for this beam. In both posts and their foundations, as well as in the beam, ring cables are located, forming a closed system in the working position of the barrier. The beam is equipped with guides at the top and bottom, designed to interact with two pairs of rollers installed on the main rack.

The disadvantage of these technical solutions is the lack of stopping power.

The task to be solved by the claimed invention is the development of a design of an anti-ram device with improved performance properties.

This problem is solved due to the fact that the anti-ram device consists of the right, left, middle posts and a barrier beam, all the posts and the barrier beam are hollow and contain steel ring ropes inside, containing an electric drive for moving the barrier beam in a horizontal position, while the left and middle posts are located side by side and connected to each other by ties, the ends of the ropes are connected by rope clamps, there are hooks on the barrier beam on the right side, attached to the locks on the right rack , an emphasis on the barrier beam on the left side, put on supports on the left post, which, when ramming, together with the ropes in the barrier beam and in the posts, form a single “fishing net cell” system that reliably catches vehicles going to the ram.

The technical result is to improve the stopping power of the anti-ram device, including an increase in strength characteristics.

The anti-ram device consists of right, left and middle racks and a barrier beam, and in all racks and in the barrier beam there are steel ropes inside.

The essence of the invention is illustrated by drawings:

Fig. 1 - general view of the anti-ram device in a perspective view;

Fig. 2 - fragment of anti-ram device;

Fig. 3 - the location of the ring ropes with clamps inside the barrier beam;

Fig. 4 - fragment of anti-ram device;

Fig. 5 is a graph of the stress distribution during a collision.

The figures indicate: 1 - right post; 2 - left post; 3 - middle rack; 4 - barrier beam; 5 - coupler; 6 - stand; 7 - jib; 8 - annular beam rope; 9 - electric drive; 10 - end rollers; 11 - rope clamps "elephant"; 12 - hook; 13 - double-sided emphasis; 14 - support; 15 - lock; 16 - additional profiles; 17 - gear rack; 18 - guide rail; 19 - roller trolley; 20 - annular rope racks; 21 - cover.

The anti-ram device (Fig. 1) consists of a right post 1 with two struts 7, a left post 2 and an average post 3 located next to the left post 2 and connected to it by means of couplers 5. In this case, the barrier beam 4 passes through the posts 1, 2, 3.

Barrier beam 4 is made of two horizontal hollow profiles connected by inclined hollow profiles. Inside the horizontal hollow profiles, forming a closed system, there is a ring rope 8 made of steel, made of one piece in two rows. The ends of the rope 8 from the side of the left post are interconnected by rope clamps "elephant" 11 (Fig. 3). Preferably in four places in 100 mm increments.

For the convenience of pulling the rope into the beam 4, holes with removable covers 21 are provided at both ends of the beam 4.

End rollers 10 are installed on both end sides of the barrier beam 4 in the lower part to facilitate rolling onto the racks 1, 2, 3. On the side of the right rack 1 on the barrier beam 4 there are two hooks 12, which is displaced together with the beam 4 when the barrier is rammed and is put on the lock 15 installed on the rack 1, due to which the structure of the rack 1 and the barrier beam 4 are connected.

On the barrier beam 4 from the side of the left post 2, a double-sided stop 13 is provided, which, when the barrier is rammed, is put on the support 14 located on the left post 2, which ensures the connection of the structure of the post 2 and the barrier beam 4 (Fig. 2).

Rack 1 is made of a profile pipe with partitions and two braces 7, designed for structural stability. One jib 7 is attached to the front of the rack 1, the second to the end. At the bottom, the rack 1 and the braces 7 are connected by two additional profiles 16, forming triangles. The jib is installed on the opposite side of the ram to increase the stopping power during ramming.

Racks 2 and 3 are also made of profile pipes with partitions. Moreover, the racks 2 and 3 are interconnected by couplers 5. Also between the rack 2 and 3 at the level of the barrier beam 4 on the stand 6 is an electric drive 9 for the movement of the barrier beam 4 in a horizontal position. The electric drive 9 is made with a gear rack 17. Inside the racks 2 and 3, rollers are provided to hold the beam 4 (not shown in the drawings).

Inside the racks 1, 2, 3 are also steel ring ropes 20, forming a closed system. In rack 1 there are two ropes 20, in racks 2, 3 - one rope 20 is enough, since they are combined with ties 5. The ends of the ropes 20 are connected at the bottom with rope clamps "elephant" 11 in four places with a step of 100 mm.

The anti-ram device is installed as follows. Two recesses are made in the ground for racks 1, 2, 3, on the bottom of which crushed stone is poured. Further, reinforcing meshes are placed in the recesses and concrete is poured. Racks 1, 2, 3 are installed in such a way that they go into the concrete to a depth that ensures stability.

The device works as follows.

The transport going to the ram displaces the barrier beam 4. When the beam 4 is displaced, the double-sided stop 13 is put on the support 14 located on the left post 2, which ensures the connection of the structure of the rack 2 and the barrier beam 4. The hook 12 during the ramming also shifts along with the beam 4 and is put on the lock 15 installed on the rack 1, due to which the structure of the rack 1 and the barrier are connected beams 4.

The ropes 20 in the racks 1, 2, 3 and the ropes 8 in the barrier beam 4 of the barrier, forming a single system "fishing net cell" due to the lock 15, the hook 12, the stop 13 and the support 14, reliably catches the transport going to the ram.

The movement of the barrier beam 4 in a horizontal position is carried out by means of an electric drive 9, which rotates the gear, which in turn moves the rack 17 connected to the beam 4 (Fig. 4).

In the normal state, the hook 12 passes by the lock 15 at a distance of 10-20 mm, and only when ramming does the hook 12 move along with the beam 4 and put on the lock 15. This is a unique feature and advantage, since other anti-ramming devices require the rack and beam to be connected manually, which is impractical and takes time, or the connection occurs through additional servo drives, which complicates the design.

The advantages of this anti-ram device also lies in the fact that the maximum weight of one part is not more than 140 kg, therefore it can be mounted at the facility by a team of up to three people without the help of lifting mechanisms. The connections of all elements are bolted, which excludes hot work at the facility.

The design of the barrier, its dimensions and weight provide the possibility of compact transport packaging, which makes it possible to transport it on a standard Gazelle-type vehicle. Unloading on site can be done in parts, without the use of lifting mechanisms.

Also, due to the absence of the need to connect the rack 1 and the beam 4 manually or using a servo, the operation becomes more convenient, the probability of breakdowns is significantly reduced and the stopping force is increased.

Below is a calculation of the strength test of the main parts of the barrier.

Using the software, we simulate physical processes that are described by partial differential equations (PDE). Further, the problems are solved by the finite element method (FEM).

The finite element method (FEM) is a numerical method for solving partial differential equations, as well as integral equations that arise in solving problems of applied physics.

Data for calculation:

1. Vehicle weight 20 tons, speed 40 km/h.

2. Vehicle weight 7 tons, speed 70 km/h.

- Transmission time of the impulse from the vehicle to the barrier (dt) = 1 s.

- Gravity (g) = 9.8 m/s2.

- The main structural material of the barrier will take St5sp

Table 1 - Mechanical properties of steel St5sp Parameter Value Yield strength, N/mm2, not less than 274 Tensile strength, N/mm2 490 Relative extension, % 17

Rope system check.

To check the strength of steel ropes 8 and 20 located inside the barrier, a numerical method is used.

To begin with, the force acting on the barrier at the moment of impact is calculated.

The formula for calculating the momentum force: F = m * (V1 - V2) / dt, where F is the impact force in newtons; m - body weight in kilograms; V1 - speed at the beginning of impact in m/s; V2 - speed after impact in m/s; dt - contact time in seconds.

First case:

F \u003d 20000 * (11.11 - 0) / 1 \u003d 222200 N \u003d 222.2 kN

Second case:

F = 7000 * (19.44-0) / 1 = 136080 N = 136.1 kN

Therefore, we consider a more loaded case of 222.2 kN.

We choose the F18 rope, but to withstand the required breaking load, we put two ropes.

Basic simulation parameters:

- St5sp steel is used.

- set the speed of a moving object = 11.11 m/s = 40 km/h;

- we set fastenings and boundary conditions.

Calculation of the maximum allowable loads.

The strength of the structure is assessed by comparing the acting stresses with the allowable stresses.

The determining parameter of structural reliability is the stress or stress state in any area of the structure. Based on the analysis of calculated or experimental data on the stress state of the structure, the points or point of the structure are identified where the highest stresses occur.

During the calculation in the program, the following maximum stresses were obtained: 454 MPa.

On FIG. 5 shows a graph of the voltage distribution according to Mises on the barrier.

Based on the results of the analysis, it can be concluded that the acting stresses meet the technical requirements and consider the strength limit for St5sp steel to be satisfactory.

Claims (1)

Anti-ram device consisting of right, left, middle posts, a barrier beam, all the posts and the barrier beam are hollow, inside of which are steel ring ropes, and containing an electric drive for moving the barrier beam in a horizontal position through the posts, characterized in that the left and middle posts are interconnected by ties, the ends of the ropes are connected by rope clamps, and on the barrage beam on the right side there is a hook with the possibility of putting on a lock mounted on the right post , and on the left side of the beam there is a double-sided stop with the possibility of putting on supports on the left post.