CN212358132U - Tunnel inclined shaft swift current car arresting gear - Google Patents

Abstract

The utility model discloses a tunnel inclined shaft swift current car arresting gear. The blocking device for the inclined shaft chute of the tunnel comprises an upper layer steel plate, a shield tail steel wire brush, a steel wire brush seat sleeve, a lower layer steel plate, a U-shaped base, a self-locking support, a releasing device, a hoisting steel wire rope, a balance weight, a lifting steel wire rope and a fixed pulley; when the wheel contacts the shield tail steel wire brush, the shield tail steel wire brush protrudes 20cm from the ground in a blocking state, the wheel needs to pass through the shield tail steel wire brush and must overcome the inherent bending moment force of the shield tail steel wire brush, the multiple rows of shield tail steel wire brushes have reverse blocking effect on the tire, and finally the downward-sliding vehicle is blocked and stopped, and when the vehicle is in a normal lane passing state, the shield tail steel wire brush descends and is hidden in the rectangular opening and is flush with the road surface. The tunnel inclined shaft slide carriage blocking device can be repeatedly used, and is energy-saving and environment-friendly without external force; no complex mechanical structure and control system, and high arresting success rate.

Description

Tunnel inclined shaft swift current car arresting gear

Technical Field

The utility model relates to a mechanical device technical field particularly, relates to a tunnel inclined shaft swift current car arresting gear.

Background

In the design of the tunnel, in order to guarantee the construction period of the project, improve the ventilation of the tunnel, well prevent and drain water, guarantee the construction power supply and deal with other geological and natural disasters, the inclined shaft construction technology is adopted to solve the construction problem of the long tunnel, and the construction of the long tunnel is 'short driving'. Inclined shaft often has the characteristics that the hole body is long, the longitudinal slope is big, and when convenient construction, the transportation safety risk is prominent in the inclined shaft, especially inclined shaft swift current car. When a wheeled vehicle enters or exits the inclined shaft, in the normal running process, the vehicle is out of control and over speed caused by the failure of a mechanical system, and the vehicle is not stopped in time, so that greater safety accidents and property loss are caused.

In the prior art, a roadbed and a brake bed arranged on the upper surface of the roadbed are adopted, the slope angle a of the roadbed is 0-40 degrees, the front section of the roadbed is a buffer section, the brake bed is arranged on the rear section of the roadbed, the length of the buffer section is 0-50 meters, the width of the buffer section is 3-12 meters, and the rolling resistance coefficient of the road surface friction of the buffer section is 0.01-0.15. The buffer section reduces the kinetic energy of the vehicle by using the slope or the road surface friction; the road surface friction of the buffer section is designed according to the target effect of the vehicle arresting system.

For example, chinese patent publication No. CN201620197812.4 discloses a vehicle arresting device based on energy-absorbing material, which includes a roadbed and a brake bed disposed on the upper surface of the roadbed. This vehicle arresting device based on buffering energy-absorbing material can guarantee passenger's safety and avoid the vehicle structure to take place great destruction when realizing effectively arresting. The vehicle arresting device mainly comprises a buffering energy-absorbing material, the buffering energy-absorbing material has designable crushing strength, and the material absorbs the kinetic energy of the vehicle under the rolling of wheels, so that the aim of arresting the vehicle or decelerating the vehicle is fulfilled. The vehicle arresting device also has the characteristics of good deceleration effect, safe braking process, small vibration and the like, and can be applied to the fields of highway danger avoiding lanes and the like.

For example, the utility model with the chinese patent publication No. CN201610142406.2 discloses an integrated disc type carrier-based aircraft landing arresting device and an arresting method thereof, which control the braking torque of a winch by controlling an electromagnetic brake to realize intelligent arresting of the carrier-based aircraft from high speed to low speed until the arresting is stopped, when a tail hook of the carrier-based aircraft hooks an arresting cable to pull the arresting cable out of the winch, the winding radius of the arresting cable on the winch is larger than the radius of a large gear, the arresting force of the arresting device on the carrier-based aircraft is minimum, the damage to the carrier-based aircraft is minimum, the winding radius of the arresting cable on the winch is gradually reduced along with the increase of the length of the pulled arresting cable, when the winding radius is gradually smaller than the radius of the large gear, the arresting torque of the arresting cable on the carrier-based aircraft is gradually increased until the carrier-based aircraft is arrested, the arresting device has the advantages of small volume, small occupied space, simple structure and high intelligent degree, easy to control and has long service life.

The prior art has at least the following problems:

the vehicle arresting device in the prior art has the defects of low arresting success rate due to simple structure and fragile buffering energy-absorbing materials.

Aiming at the problem of low blocking success rate caused by the fact that a vehicle blocking device in the prior art is simple in structure and a buffering energy-absorbing material is fragile, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tunnel inclined shaft swift current car arresting gear.

Tunnel inclined shaft swift current car arresting gear includes: the steel wire brush comprises an upper steel plate, a shield tail steel wire brush, a steel wire brush seat sleeve, a lower steel plate, a U-shaped base, a self-locking support, a releasing device, a hoisting steel wire rope, a counterweight, a hoisting steel wire rope and a fixed pulley;

the releasing device and the fixed pulley are fixed to the top of the tunnel respectively, the releasing device lifts the balance weight through a hoisting steel wire rope, the first end of the hoisting steel wire rope is connected with the balance weight, the second end of the hoisting steel wire rope penetrates through the fixed pulley to be fixed to the lower steel plate, the self-locking support is fixedly arranged between the lower steel plate and the U-shaped base, the upper end of the lower steel plate is fixedly provided with a steel wire brush seat sleeve, the shield tail steel wire brush is fixedly arranged in the steel wire brush seat sleeve, the upper steel plate and the U-shaped base are fixedly connected, a rectangular opening for accommodating the shield tail steel wire brush to penetrate is formed in the upper steel plate, when the releasing device is triggered, the hoisting steel wire rope is separated from the releasing device, the balance weight drives the lower steel plate to move upwards under the.

Furthermore, a guide steel plate surrounding the rectangular opening is fixed at the lower end of the upper steel plate.

Furthermore, tunnel inclined shaft swift current car arresting gear still includes the on-vehicle controller with release gear communication connection, and the on-vehicle controller includes electric connection's speed monitoring sensor, PLC controller and wireless transmission module in proper order, and wireless transmission module and release gear communication connection, wireless transmission module are used for sending wireless control signal to release gear, control release gear release hoisting wire rope.

Further, the releasing device comprises an electromagnet, a first clamping hand, a second clamping hand, a pin shaft, a clamping disc, a connecting plate, a bolt, a support, a wireless receiving module and a control module, the lower end of the connecting plate is connected with the upper end of the electromagnet through the bolt, the lower end of the electromagnet is connected with the clamping disc, the upper end of the first clamping hand and the upper end of the second clamping hand are both clamped and fixed on the inner side of the clamping disc, the middle of the first clamping hand and the middle of the second clamping hand are hinged through the pin shaft, the lower end of the first clamping hand and the lower end of the second clamping hand abut against each other, two ends of the pin shaft are clamped and fixed on the support, the first end of the wireless receiving module is in communication connection with the wireless transmission module, the second end of the wireless receiving module is electrically connected with the control module, and the control.

Furthermore, a plurality of self-locking supports are arranged between the lower layer steel plate and the U-shaped base, and the distance between any two adjacent self-locking supports in the plurality of self-locking supports is the same.

Furthermore, a plurality of rectangular openings for accommodating the shield tail steel wire brush to pass through are formed in the upper steel plate, and the distance between any two adjacent rectangular openings in the plurality of rectangular openings is the same.

Further, the self-locking support comprises a first support plate and a second support plate, the first support plate and the second support plate are arranged in parallel, the first support plate is lifted and lowered through stretching of the oil cylinder, a first support rod is symmetrically arranged above two side edges of the second support plate below the two side edges of the first support plate, the second support rod, a third support rod and a fourth support rod are symmetrically arranged below the two side edges of the first support plate, the upper portion of the first support rod is hinged to the lower portion of the second support rod in a crossed mode, the lower portion of the first support rod is hinged to the upper end of the third support rod, the upper end of the fourth support rod is hinged to the lower end of the second support rod, the lower end of the fourth support rod is hinged to the upper portion of the third support rod, the second support rod is arranged in parallel to the third support.

Compared with the prior art, tunnel inclined shaft swift current car arresting gear have following superior effect that is showing:

the tunnel inclined shaft sliding vehicle arresting device has the advantages that 1, a complex mechanical structure and a complex control system are omitted, and multiple rows of shield tail steel wire brushes are adopted, so that the blocking success rate of the tunnel inclined shaft sliding vehicle arresting device is high, safety and stability are realized, noise and dust are avoided.

2, the shield tail steel wire brush can be lifted by the gravity of the balance weight without external force, so that the shield tail steel wire brush is energy-saving and environment-friendly.

3, tunnel inclined shaft swift current car arresting gear, simple structure, easy dismounting once drops into, can repetitious usage, long service life.

4, overcome among the current anticollision arresting gear, the feared psychology that anticollision arresting gear caused the driver, simultaneously tunnel inclined shaft swift current car arresting gear is saved space and construction cost than special danger avoiding lane of highway again.

Drawings

Fig. 1 is a schematic cross-sectional view of the tunnel inclined shaft car-sliding arresting device of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is a top view of the tunnel inclined shaft car-sliding arresting device of the present invention;

fig. 4 is a schematic structural view of an on-board controller of the tunnel inclined shaft car-sliding arresting device according to the present invention;

fig. 5 is a schematic structural view of a self-locking bracket of the tunnel inclined shaft car-sliding arresting device of the present invention;

fig. 6 is a schematic view of the planer structure of the releasing device of the tunnel inclined shaft chute blocking device of the present invention.

Description of reference numerals:

1-upper steel plate; 2-guiding the steel plate; 3-shield tail steel wire brush; 4-steel wire brush seat cover; 5-lower steel plate; 6-U-shaped base; 7-self-locking support, 71-first support plate, 72-second support plate, 73-first support rod, 74-second support rod, 75-third support rod, 76-fourth support rod and 77-oil cylinder; 8-a release device, 81-an electromagnet, 82-a first clamping hand, 83-a second clamping hand, 84-a pin shaft, 85-a clamping disc, 86-a connecting plate, 87-a bolt and 88-a bracket; 9-hoisting a steel wire rope; 10-a counterweight; 11-hoisting a steel wire rope; 12-a fixed pulley; 13-a rectangular opening; 14-vehicle-mounted controller, 141-speed monitoring sensor, 142-PLC controller and 143-wireless transmission module.

Detailed Description

The invention is described in further detail below with reference to the drawings and the detailed description.

As shown in fig. 1 to 3, the tunnel inclined shaft swift current car arresting device comprises: the device comprises an upper steel plate 1, a shield tail steel wire brush 3, a steel wire brush seat sleeve 4, a lower steel plate 5, a U-shaped base 6, a self-locking support 7, a release device 8, a hoisting steel wire rope 9, a balance weight 10, a hoisting steel wire rope 11 and a fixed pulley 12;

the releasing device 8 and the fixed pulley 12 are respectively fixed with the top of the tunnel, the releasing device 8 lifts the balance weight 10 through a hoisting steel wire rope 9, the first end of the hoisting steel wire rope 11 is connected with the balance weight 10, the second end of the hoisting steel wire rope 11 passes through the fixed pulley 12 to be fixed with the lower steel plate 5, the self-locking bracket 7 is fixedly arranged between the lower steel plate 5 and the U-shaped base 6, the upper end of the lower steel plate 5 is fixedly provided with a steel wire brush seat sleeve 4, the shield tail steel wire brush 3 is fixedly arranged in the steel wire brush seat sleeve 4, the upper steel plate 1 is fixedly connected with the upper edge of the U-shaped base 6, the upper steel plate 1 is provided with a rectangular opening 13 for accommodating the shield tail steel wire brush 3 to pass through, when the releasing device 8 is triggered, the hoisting steel wire rope 9 is separated from the releasing device 8, the balance weight 10 drives the lower steel plate 5 to move upwards under the action of gravity, so that the shield tail steel wire brush 3, when the releasing device 8 is triggered, the hoisting steel wire rope 9 is separated from the releasing device 8, the counterweight 10 vertically falls under the action of gravity, and the counterweight 10 is fixed with the lower steel plate 5 through the hoisting steel wire rope 11, so that the lower steel plate 5 moves upwards under the driving of the counterweight 10, the shield tail steel wire brush 3 is exposed out of the rectangular opening 13, and the vehicle is prevented from moving.

Further, as shown in fig. 1 and 2, a guide steel plate 2 surrounding a rectangular opening 13 is fixed at the lower end of the upper steel plate 1, specifically, the guide steel plate 2 is strip-shaped, the guide steel plate 2 is welded at the lower end of the upper steel plate 1, when the vehicle is normally turned on, the upper end of the shield tail wire brush 3 is located below the upper steel plate 1 and between the guide steel plates 2, and when the release device 8 is triggered, the shield tail wire brush 3 is exposed upwards along the guide steel plate 2 to expose the rectangular opening 13, so as to ensure that the shield tail wire brush 3 accurately passes through the rectangular opening 13.

Further, as shown in fig. 4, the tunnel inclined shaft chute blocking device further includes a vehicle-mounted controller 14 in communication connection with the releasing device 8, the vehicle-mounted controller 14 includes a speed monitoring sensor 141, a PLC controller 142 and a wireless transmission module 143 which are electrically connected in sequence, the wireless transmission module 143 is in communication connection with the releasing device 8, the wireless transmission module 143 is used for sending a wireless control signal to the releasing device 8 to control the releasing device 8 to release the hoisting steel wire rope 9, specifically, when the vehicle slides, the speed is gradually increased, the speed monitoring sensor 141 monitors the vehicle speed in real time and sends the monitored vehicle speed data to the PLC controller 142, when the vehicle speed reaches a preset warning value, the PLC controller 142 controls the wireless transmission module 143 to send a wireless control signal to the releasing device 8 to control the releasing device 8 to separate from the hoisting steel wire rope 9, so that the counterweight 10 falls to drive the shield tail steel wire brush 3 to rise, the model of the speed monitoring sensor 141 is JK08/NS43NCT1, and the model of the wireless transmission module 143 is nRF24L 01.

Further, as shown in fig. 6, the releasing device 8 includes an electromagnet 81, a first clamping hand 82, a second clamping hand 83, a pin 84, a clamping disc 85, a connecting plate 86, a bolt 87, a bracket 88, a wireless receiving module (not shown in the figure) and a control module (not shown in the figure), the lower end of the connecting plate 86 is connected with the upper end of the electromagnet 81 through the bolt 87, the upper end of the connecting plate 86 is fixedly connected with the top of the inclined shaft of the tunnel, the lower end of the electromagnet 81 is connected with the clamping disc 85, the upper end of the first clamping hand 82 and the upper end of the second clamping hand 83 are both clamped inside the clamping disc 85, the middle of the first clamping hand 82 and the middle of the second clamping hand 83 are hinged through the pin 84, the lower end of the first clamping hand 82 and the lower end of the second clamping hand 83 abut against each other, wherein the upper end of the hoisting cable 9 is sleeved on the lower end of the first clamping hand 82 and the lower end of the second clamping hand 83, the two ends of the pin, wherein, two ends of the pin shaft 84 are provided with threads, the bracket 88 is correspondingly provided with a through hole (not shown in the figure), the pin shaft 84 is arranged on the bracket 88 through the through hole, the pin shaft 84 and the bracket 88 are fixed through a nut, the first end of the wireless receiving module is in communication connection with the wireless transmission module 143, the second end of the wireless receiving module is electrically connected with the control module, the control module is electrically connected with the electromagnet 81, the control module is used for controlling the electromagnet 81 to start and stop, when the vehicle slides, the control module controls the electromagnet 81 to start, the clamping disc 85 moves upwards under the driving of the electromagnet 81, the upper end of the first clamping hand 82 and the upper end of the second clamping hand 83 are separated from the clamping disc 85, the middle part of the first clamping hand 82 and the middle part of the second clamping hand 83 rotate around the pin shaft 84, so that the lower end of the first clamping hand 82 and the lower end of the second clamping hand 83 are separated, and the hoisting steel wire rope 9 sleeved on the inner sides of the lower end, the model of the wireless receiving module is 315M, and the model of the control module is stc89c52 rc.

Further, as shown in fig. 1 and 2, a plurality of self-locking brackets 7 are disposed between the lower steel plate 5 and the U-shaped base 6, and the distance between any two adjacent self-locking brackets 7 in the plurality of self-locking brackets 7 is the same, so as to make the stress of the lower steel plate 5 uniform.

Further, as shown in fig. 3, a plurality of rectangular openings 13 for accommodating the shield tail steel wire brush 3 to pass through are formed in the upper steel plate 1, and the distance between any two adjacent rectangular openings 13 in the plurality of rectangular openings 13 is the same, specifically, when the releasing device 8 is triggered, the counterweight 10 falls down to drive the shield tail steel wire brush 3 to rise, each shield tail steel wire brush 3 in the plurality of shield tail steel wire brushes 3 is exposed from a corresponding rectangular opening 13 in the plurality of rectangular openings 13, and simultaneously blocks a wheel, and under the action of bending moment of the plurality of shield tail steel wire brushes 3, the vehicle stops sliding down.

Further, as shown in fig. 5, the self-locking bracket 7 includes a first support plate 71 and a second support plate 72, the first support plate 71 and the second support plate 72 are arranged in parallel, the first support plate 71 is lifted and lowered by the extension and retraction of an oil cylinder 77, a first support rod 73, a second support rod 74, a third support rod 75 and a fourth support rod 76 are symmetrically arranged below two sides of the first support plate 71 and above two sides of the second support plate 72, the upper portion of the first support rod 73 is hinged to the lower portion of the second support rod 74 in a crossing manner, the lower portion of the first support rod 73 is hinged to the upper end of the third support rod 75, the upper end of the fourth support rod 76 is hinged to the lower end of the second support rod 74, the lower end of the fourth support rod 76 is hinged to the upper portion of the third support rod 75, the second support rod 74 is arranged in parallel to the third support rod 75, and the first support plate 71 abuts to the lower.

Further, as shown in fig. 1 and 2, the counterweight 10 is arranged higher than the U-shaped base 6, and when the releasing device 8 lifts the counterweight 10 by the hoisting wire rope 9, the counterweight 10 is arranged higher than the U-shaped base 6, so as to increase the falling speed of the counterweight 10, and further increase the speed of exposing the rectangular opening 13 of the shield tail wire brush 3, so that bending moment force is provided for the wheels when the vehicle slides downwards slowly in the early stage of runaway.

Tunnel inclined shaft swift current car arresting gear's theory of operation do:

when a descending vehicle in the inclined shaft is out of control and slips, the vehicle-mounted controller 14 sends a wireless control signal, the release device 8 receives the wireless control signal, the release device 8 releases the hoisting steel wire rope 9, the balance weight 10 falls under the influence of self gravity, the balance weight 10 drives the lower steel plate 5 to move upwards through the lifting steel wire rope 11, the shield tail steel wire brush 3 fixed on the lower steel plate 5 is exposed out of the rectangular opening 13 by more than 20cm, and then the self-locking support 7 is opened for self-locking, is used for preventing the lower steel plate 5 from moving downwards again under the load of the vehicle, the wheels contact the shield tail steel wire brush 3, under the action of bending moment of the shield tail steel wire brushes 3 in multiple rows, a vehicle is blocked and stopped, the balance weight 10 is lifted, the balance weight 10 is connected with the release device 8 through a hoisting steel wire rope 9, self-locking of the self-locking support 7 is released, the lower steel plate 5 drives the shield tail steel wire brushes 3 to move downwards to reset by means of self weight, and the normal vehicle passing state is recovered.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (7)

1. The utility model provides a tunnel inclined shaft swift current car arresting gear which characterized in that includes: the steel wire brush shield comprises an upper steel plate (1), a shield tail steel wire brush (3), a steel wire brush seat sleeve (4), a lower steel plate (5), a U-shaped base (6), a self-locking support (7), a releasing device (8), a hoisting steel wire rope (9), a balance weight (10), a hoisting steel wire rope (11) and a fixed pulley (12);

the releasing device (8) and the fixed pulley (12) are respectively fixed with the top of the tunnel, the releasing device (8) lifts the counterweight (10) through the hoisting steel wire rope (9), the first end of the hoisting steel wire rope (11) is connected with the counterweight (10), the second end of the hoisting steel wire rope (11) penetrates through the fixed pulley (12) and is fixed with the lower steel plate (5), the self-locking support (7) is fixedly arranged between the lower steel plate (5) and the U-shaped base (6), the upper end of the lower steel plate (5) is fixedly provided with the steel wire brush seat sleeve (4), the steel wire brush (3) at the tail end is fixedly arranged in the steel wire brush seat sleeve (4), the upper steel plate (1) is fixedly connected with the upper edge of the U-shaped base (6), the upper steel plate (1) is provided with a rectangular opening (13) for accommodating the steel wire brush (3) to pass through, when the releasing device (8) is triggered, the hoisting steel wire rope (9) is separated from the releasing device (8), and the counterweight (10) drives the lower steel plate (5) to move upwards under the action of gravity, so that the shield tail steel wire brush (3) is exposed out of the rectangular opening (13).

2. The tunnel slope carriage arresting device according to claim 1, characterized in that the lower end of the upper steel plate (1) is fixed with a guide steel plate (2) surrounding the rectangular opening (13).

3. The device for blocking the tunnel inclined shaft slide car according to claim 1, further comprising an on-board controller (14) in communication connection with the releasing device (8), wherein the on-board controller (14) comprises a speed monitoring sensor (141), a PLC (142) and a wireless transmission module (143), the speed monitoring sensor, the PLC and the wireless transmission module are electrically connected in sequence, the wireless transmission module (143) is in communication connection with the releasing device (8), and the wireless transmission module (143) is used for sending a wireless control signal to the releasing device (8) to control the releasing device (8) to release the hoisting steel wire rope (9).

4. The device for blocking the tunnel inclined shaft scraper-trough conveyer according to claim 3, wherein the releasing device (8) comprises an electromagnet (81), a first clamping hand (82), a second clamping hand (83), a pin shaft (84), a clamping disc (85), a connecting plate (86), a bolt (87), a bracket (88), a wireless receiving module and a control module, the lower end of the connecting plate (86) is connected with the upper end of the electromagnet (81) through the bolt (87), the lower end of the electromagnet (81) is connected with the clamping disc (85), the upper end of the first clamping hand (82) and the upper end of the second clamping hand (83) are clamped and fixed inside the clamping disc (85), the middle part of the first clamping hand (82) and the middle part of the second clamping hand (83) are hinged through the pin shaft (84), and the lower end of the first clamping hand (82) and the lower end of the second clamping hand (83) are abutted, the two ends of the pin shaft (84) are fixedly clamped on the support (88), the first end of the wireless receiving module is in communication connection with the wireless transmission module (143), the second end of the wireless receiving module is electrically connected with the control module, and the control module is electrically connected with the electromagnet (81).

5. The tunnel inclined shaft carriage rejection device according to claim 1, wherein a plurality of said self-locking brackets (7) are disposed between said lower steel plate (5) and said U-shaped base (6), and the distance between any two adjacent self-locking brackets (7) among said plurality of self-locking brackets (7) is the same.

6. The device for blocking the tunnel inclined shaft carriage as per claim 1, wherein a plurality of rectangular openings (13) for accommodating the shield tail wire brush (3) to pass through are formed in the upper steel plate (1), and the distance between any two adjacent rectangular openings (13) in the plurality of rectangular openings (13) is the same.

7. The device for blocking the tunnel inclined shaft swift current car as claimed in claim 1, wherein the self-locking bracket (7) comprises a first supporting plate (71) and a second supporting plate (72), the first supporting plate (71) and the second supporting plate (72) are arranged in parallel with each other, the first supporting plate (71) is lifted and lowered by the extension and retraction of an oil cylinder (77), a first supporting rod (73), a second supporting rod (74), a third supporting rod (75) and a fourth supporting rod (76) are symmetrically arranged below the two sides of the first supporting plate (71) and above the two sides of the second supporting plate (72), the upper part of the first supporting rod (73) is hinged with the lower part of the second supporting rod (74) in a crossing manner, the lower part of the first supporting rod (73) is hinged with the upper end of the third supporting rod (75), the upper end of the fourth supporting rod (76) is hinged with the lower end of the second supporting rod (74), the lower extreme of fourth bracing piece (76) with the upper portion of third bracing piece (75) is articulated, second bracing piece (74) with third bracing piece (75) parallel arrangement, first backup pad (71) with lower floor's steel sheet (5) are supported and are pasted.

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