CN211975044U - Novel evacuation platform - Google Patents

Abstract

The utility model discloses a novel evacuation platform, which comprises an evacuation platform support and evacuation platform footpath plates paved on the evacuation platform support, wherein the evacuation platform support and the evacuation platform footpath plates are respectively provided with a plurality of platform brackets of each evacuation platform support, the platform brackets are correspondingly supported and fixed at the lower parts of the splicing parts of two adjacent evacuation platform footpath plates, and the arc-shaped or straight-shaped mounting rack of each evacuation platform support is correspondingly connected and fixed with subway tunnel segments; the two adjacent evacuation platform footpath plates supported on the same evacuation platform bracket are connected with the evacuation platform bracket through at least one positioning piece and at least one bolt connecting piece. The utility model has the advantages that: the structure is simple, the dead weight is light, the construction speed is high, the connection is firm, the stability is good, the installation and the disassembly are convenient, and the problems of the floating and the displacement of the evacuation platform footpath plate caused by the vibration and the wind power in the running process of the train can be effectively solved.

Description

Novel evacuation platform

Technical Field

The utility model relates to an evacuation facility field of traffic, specific saying so relates to a novel evacuation platform.

Background

With the increasing of urban population, ground traffic pressure is higher and higher, and subway construction is in the rapid development stage, and due to punctuality and rapidity of the subway, passenger flow is increased continuously, but the subway is a dense public place, and escape conditions of subway tunnels are relatively limited, so that passengers can not evacuate to cause a large number of casualties in case of accidents. Therefore, the problem of safe evacuation in the subway becomes a hot problem. And the subway passenger flow is large, the escape condition of the subway tunnel is poor, the escape distance is long, the path is few, the escape time is short and other influence factors cause that the subway tunnel needs to adopt effective safe evacuation measures to solve the problem. The design and application of the subway evacuation platform are evacuation channels for providing passengers with rapid evacuation when the evacuation platform is used for dealing with the accidents.

Sparse platform mainly comprises landing slab and platform support, and traditional platform support adopts the steel construction usually, because underground space is moist, its refractiveness, the relatively poor and easy rust corrosion of durability, and secondly, traditional sparse landing slab adopts the mode of directly laying to mat formation on platform support more, lacks effectual fixed, and vibration and wind-force that the subway operation in-process arouses can arouse sparse landing slab come-up and displacement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a durability is good, simple structure, ann tear open convenient, the steadiness is good, the light novel evacuation platform of dead weight for solve among the background art evacuation platform support durability poor perishable and platform board connect unstable easy not hard up come-up and displacement scheduling problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a novel evacuation platform comprises evacuation platform supports and evacuation platform footpath plates paved on the evacuation platform supports, wherein the evacuation platform supports and the evacuation platform footpath plates are respectively provided with a plurality of the evacuation platform supports, a platform bracket of each evacuation platform support is correspondingly supported and fixed at the lower part of the splicing part of two adjacent evacuation platform footpath plates, and an arc-shaped or straight-shaped mounting rack of each evacuation platform support is correspondingly connected and fixed with subway tunnel segments; the two adjacent evacuation platform footpath plates supported on the same evacuation platform bracket are connected with the evacuation platform bracket through at least one positioning piece and at least one bolt connecting piece.

Furthermore, at least one positioning hole is formed in the edges of the two ends of each evacuation platform footpath plate, and each positioning hole is correspondingly connected and matched with one positioning piece and used for limiting the sliding displacement of the two adjacent evacuation platform footpath plates in the length direction of the platform bracket of the corresponding evacuation platform support.

Furthermore, at least one connecting groove is formed in the edges of two ends of each evacuation platform footpath plate, a semicircular hole is formed in the bottom of each connecting groove, at least one embedded channel is formed in the top of a platform bracket of each evacuation platform bracket, one end of each bolt connecting piece is correspondingly connected and matched with one connecting groove, and the other end of each bolt connecting piece is correspondingly connected and matched with one embedded channel; the bolt connecting piece is used for fixing the two adjacent evacuation platform footpath plates on the platform bracket of the corresponding evacuation platform bracket.

Furthermore, the positioning piece is a positioning lug fixedly arranged at the top of the platform bracket of the evacuation platform bracket, and the positioning lug and the platform bracket are integrally formed or detachably assembled and connected; the locating hole is a U-shaped hole arranged at the edge of the evacuation platform footpath plate.

Further, bolted connection spare contains a connecting plate, a T type bolt and a nut, during the use, the connecting plate supporting is at evacuation platform pavement board connecting groove's tank bottom, the head of T type bolt is worn to establish in the embedding slot way to with embedding slot way sliding fit, the afterbody of T type bolt passes the semicircular hole of connecting groove tank bottom and the screw on the connecting plate in proper order, and with nut threaded connection.

Furthermore, a plurality of anti-skid bulges are uniformly distributed on the top of each evacuation platform footpath plate.

Furthermore, a first segment connecting piece is arranged at the upper part of the arc-shaped or straight mounting rack of each evacuation platform bracket, and a second segment connecting piece is arranged at the lower part of the arc-shaped or straight mounting rack of each evacuation platform bracket; the middle part of each first segment connecting piece and the middle part of each second segment connecting piece are pre-embedded in the corresponding arc-shaped or straight-shaped mounting rack of the evacuation platform support and are used for being connected with tie bars embedded in the arc-shaped or straight-shaped mounting racks; and two ends of each first segment connecting piece and each second segment connecting piece are exposed outside the arc-shaped or straight-shaped mounting rack of the evacuation platform support corresponding to the first segment connecting piece and the second segment connecting pieces, and are fixedly connected with the subway tunnel segments through chemical anchor bolts.

Further, the first segment connecting piece comprises a first fixing plate and a first stiffening plate fixed on one side of the first fixing plate; the second segment connecting piece comprises a second fixing plate and a second stiffening plate fixed on one side of the second fixing plate; the middle parts of the first stiffening plate and the first fixing plate of the first segment connecting piece and the middle parts of the second stiffening plate and the second fixing plate of the second segment connecting piece are pre-embedded in the arc-shaped or straight-shaped mounting frame, and the two ends of the first fixing plate of the first segment connecting piece and the two ends of the second fixing plate of the second segment connecting piece are exposed outside the arc-shaped or straight-shaped mounting frame.

Furthermore, a first tie bar through hole is formed in the first stiffening plate, and a first connecting hole is formed in each of two ends of the first fixing plate, which are exposed outside the arc-shaped or straight-shaped mounting frame; the second stiffening plate is provided with a second lacing bar through hole, and the two ends of the second fixing plate exposed outside the arc-shaped or straight-shaped mounting frame) are provided with second connecting holes.

Furthermore, at least one lightening hole is arranged at the intersection of the platform bracket of each evacuation platform support and the arc-shaped or straight-shaped mounting rack.

Compared with the prior art, the utility model has the advantages that:

(1) the evacuation platform bracket is provided with the positioning boss corresponding to the positioning hole on the evacuation platform footpath plate, so that the evacuation platform footpath plate is not easy to move;

(2) the embedded channels and the bolt connecting pieces arranged on the evacuation platform bracket correspond to the connecting grooves on the evacuation platform footpath plates, so that the mounting stability of the evacuation platform plates is ensured, the mounting and dismounting of the evacuation platform plates are facilitated, and the later-stage maintenance is facilitated;

(3) the whole platform is simple in structure, light in dead weight, convenient to construct, firm in connection, good in stability and convenient to mount and dismount, and can effectively solve the problems of floating and displacement of the platform plate caused by vibration and wind power in the running process of a train or a subway.

Drawings

FIG. 1 shows an embodiment of the evacuation platform of the present invention

FIG. 2 is a view of the structure of FIG. 1 from another perspective;

FIG. 3 is a perspective view of the single evacuation platform bracket of FIG. 1 connected to a single evacuation platform deck;

FIG. 4 is an exploded view of FIG. 3;

fig. 5 is a perspective view of a first segment connector;

fig. 6 is a perspective view of a second segment connector;

fig. 7 is a schematic node diagram of the first embodiment of the connection between the evacuation platform and the subway tunnel segment;

fig. 8 is a schematic node diagram of a second embodiment of the connection between the evacuation platform and the subway tunnel segment according to the present invention;

fig. 9 shows a second embodiment of the evacuation platform of the present invention;

FIG. 10 is a perspective view of the single evacuation platform bracket of FIG. 9 connected to a single evacuation platform deck;

description of reference numerals: 1. an evacuation platform support; 1.1, a platform bracket; 1.2, an arc-shaped or straight mounting rack; 2. evacuation platform footpath plate; 2.1, positioning holes; 2.2, connecting the grooves; 2.3, semicircular holes; 2.4, anti-skid bulges; 3. a positioning member; 4. a bolt connection; 5. a first segment connector; 5.1, a first fixing plate; 5.1a, a first connection hole; 5.2, a first stiffening plate; 5.2a, perforating the first tie bar; 6. a second segment connector; 6.1, a second fixing plate; 6.1a and a second connecting hole; 6.2, a second stiffening plate; 6.2a, perforating the second tie bar; 7. pre-burying a channel; 8. lightening holes; 9. a chemical anchor bolt; 10. subway tunnel segment.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, how to implement the present invention is further explained below with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 8, the novel evacuation platform provided by the present invention is mainly used for evacuating people in case of accidents in a subway tunnel, and comprises an evacuation platform support 1 and evacuation platform footplates 2 laid on the evacuation platform support 1, wherein the evacuation platform support 1 and the evacuation platform footplate 2 are respectively provided with a plurality of platform brackets 1.1 of each evacuation platform support 1, which are correspondingly supported and fixed at the lower part of the splicing position of two adjacent evacuation platform footplates 2, and the arc-shaped or straight-shaped mounting rack 1.2 of each evacuation platform support 1 is correspondingly connected and fixed with a subway tunnel segment 10; two adjacent evacuation platform footpath plates 2 supported on the same evacuation platform bracket 1 are connected with the evacuation platform bracket 1 through at least one positioning piece 3 and at least one bolt connector 4 as shown in fig. 1 to 4.

Specifically, in the utility model, referring to fig. 3 and 4, at least one positioning hole 2.1 is provided at the edge of each evacuation platform footpath plate 2, and each positioning hole 2.1 is correspondingly connected and matched with one positioning element 3, so as to limit the sliding displacement of two adjacent evacuation platform footpath plates 2 in the length direction of the platform bracket 1.1 of the corresponding evacuation platform bracket 1.

Specifically, in the utility model, referring to fig. 3 and 4, at least one connecting groove 2.2 is further formed at the edges of both ends of each evacuation platform footpath plate 2, a semicircular hole 2.3 is formed at the bottom of each connecting groove 2.2, at least one pre-buried channel 7 is formed at the top of the platform bracket 1.1 of each evacuation platform support 1, one end of each bolt connecting piece 4 is correspondingly connected and matched with one connecting groove 2.2, and the other end is correspondingly connected and matched with one pre-buried channel 7; the bolt connection 4 is used for fixing two adjacent evacuation platform footpath plates 2 on the corresponding platform bracket 1.1 of the evacuation platform support 1.

Specifically speaking, the utility model discloses in, for preventing that the emergence of evacuation crowd from falling down when walking on evacuation platform footpath board 2, refer to fig. 4 and show, be equipped with a plurality of non-slip raised 2.4 at every evacuation platform footpath board 2's top equipartition.

Specifically, in the present invention, as shown in fig. 2 to 4, a first duct piece connecting piece 5 is disposed on the upper portion of the arc-shaped or straight mounting frame 1.2 of each evacuation platform support 1, and a second duct piece connecting piece 6 is disposed on the lower portion; the middle part of each first segment connecting piece 5 and each second segment connecting piece 6 is pre-embedded in the corresponding arc-shaped or straight mounting rack 1.2 of the evacuation platform support 1 and is used for being connected with the tie bar embedded in the arc-shaped or straight mounting rack 1.2; the two ends of each first segment connecting piece 5 and each second segment connecting piece 6 are exposed outside the arc-shaped or straight-shaped mounting rack 1.2 of the evacuation platform support 1 corresponding to the first segment connecting pieces and the second segment connecting pieces, and are connected and fixed with the subway tunnel segment 10 through chemical anchor bolts 9.

Specifically, in the present invention, in order to reduce the self-weight of the evacuation platform support, referring to fig. 3 and 4, at least one lightening hole 8 is formed at the intersection of the platform bracket 1.1 and the arc-shaped or straight-shaped mounting frame 1.2 of each evacuation platform support 1; the cross-sectional shape of the lightening hole 8 can be any polygon, and can be determined according to actual design requirements.

As a preferred embodiment of the present invention: referring to fig. 3 and 4, two adjacent evacuation platform footpath plates 2 supported on the same evacuation platform bracket 1 are connected with the evacuation platform bracket 1 through a positioning member 3 and a bolt connector 4; the positioning piece 3 is a positioning lug which is fixedly arranged at the top of a platform bracket 1.1 of the evacuation platform bracket 1 and is integrally formed or detachably assembled and connected with the platform bracket 1.1; the positioning hole 2.1 is a U-shaped hole formed at the edge of the evacuation platform footpath plate 2; the bolt connecting piece 4 comprises a connecting plate 4.1, a T-shaped bolt 4.2 and a nut 4.3, when in use, the connecting plate 4.1 is supported at the bottom of the connecting groove 2.2 of the evacuation platform footpath plate 2, the head of the T-shaped bolt 4.2 is arranged in the embedded channel 7 in a penetrating way and is matched with the embedded channel 7 in a sliding way, and the tail of the T-shaped bolt 4.2 sequentially penetrates through the semicircular hole 2.3 at the bottom of the connecting groove 2.2 and the screw hole on the connecting plate 4.1 and is in threaded connection with the nut 4.3.

In the preferred embodiment, referring to fig. 5, the first segment connecting member 5 includes a first fixing plate 5.1 and a first stiffener plate 5.2 fixed to one side of the first fixing plate 5.1; referring to fig. 6, the second segment connecting member 6 includes a second fixing plate 6.1 and a second stiffener plate 6.2 fixed to one side of the second fixing plate 6.1; wherein, the middle parts of the first stiffening plate 5.2 and the first fixing plate 5.1 of the first segment connecting piece 5 and the middle parts of the second stiffening plate 6.2 and the second fixing plate 6.1 of the second segment connecting piece 6 are all pre-embedded in the arc-shaped or straight-shaped mounting rack 1.2, and both ends of the first fixing plate 5.1 of the first segment connecting piece 5 and both ends of the second fixing plate 6.1 of the second segment connecting piece 6 are all exposed outside the arc-shaped or straight-shaped mounting rack 1.2.

Specifically, in the preferred embodiment, referring to fig. 5 and 6, a first tie bar through hole 5.2a for being tied and matched with a tie bar embedded in the arc-shaped or straight mounting frame 1.2 is formed in the first stiffening plate 5.2, and a first connecting hole 5.1a for connecting the chemical anchor bolt 9 is formed in each of two ends of the first fixing plate 5.1 exposed outside the arc-shaped or straight mounting frame 1.2; a second lacing wire perforation 6.2a used for being in lacing fit with a lacing wire embedded in the arc-shaped or straight-shaped mounting frame 1.2 is arranged on the second stiffening plate 6.2, and second connecting holes 6.1a used for connecting chemical anchor bolts 9 are respectively arranged at two ends of the second fixing plate 6.1 exposed outside the arc-shaped or straight-shaped mounting frame 2; the cross-sectional shapes of the first tie bar through hole 5.2a and the second tie bar through hole 6.2a can be round, square or any other polygon; the first connection hole 5.1a and the second connection hole 6.1a may be closed kidney-round holes as shown in fig. 5 or open kidney-round holes as shown in fig. 6. When the connecting device is used, the first segment connecting piece 5 and the second segment connecting piece 6 are correspondingly connected with the tie bars in the arc-shaped or straight-shaped mounting rack 1.2 in a tie manner through the tie bar through holes 5.2a and 6.2a on the stiffening plates 5.2 and 6.2 respectively, and are connected with the subway tunnel segment 10 through the anchor bolt connecting holes 5.1a and 6.1a on the fixing plates 5.1 and 6.1 respectively through the chemical anchor bolts 9.

As another preferred example of the present invention: referring to fig. 9 and 10, two adjacent evacuation platform footpath plates 2 supported on the same evacuation platform bracket 1 are connected to the evacuation platform bracket 1 by two positioning members 3 and a bolt connector 4.

In the preferred embodiment, the structure of the positioning piece 3 and the connection mode with the platform bracket 1.1 are the same as those of the first preferred embodiment; the structure of the bolt connection 4 and the connection with the platform bracket 1.1 are also the same as in the first preferred embodiment; the shape of the positioning hole 2.1 and the connecting groove 2.2 is also the same as in the first preferred embodiment. The difference is only that: the quantity of setting element 3 and locating hole 2.1 in this preferred example is 2 and establishes respectively at the both ends of platform bracket 1.1, and the quantity of setting element 3 and locating hole 2.1 in the first preferred example is 1 and establishes the one end that is close to subway tunnel section of jurisdiction 9 at platform bracket 1.1.

In addition, in practical application, according to different sections and interval requirements, the evacuation platform bracket 1 in the evacuation platform provided by the utility model can be designed into an arc structure as shown in fig. 7, and also can be designed into a straight structure as shown in fig. 8.

When the subway tunnel segment 10 to which the evacuation platform support 1 is to be attached is arc-shaped as shown in fig. 7, the evacuation platform support 1 can be designed into an arc-shaped structure composed of a platform bracket 1.1 and an arc-shaped mounting rack 1.2 as shown in fig. 7;

when the subway tunnel segment 10 to which the evacuation platform support 1 is to be attached is straight as shown in fig. 8, the evacuation platform support 1 may be designed into a straight structure composed of the platform bracket 1.1 and the straight mounting frame 1.2 as shown in fig. 8.

When the utility model is used, firstly, the arc-shaped or straight mounting rack 1.2 of the evacuation platform support 1 is connected and fixed with the subway tunnel segment 10 by the first segment connector 5 and the second segment connector 6 through the chemical anchor bolt 9, then the bolt connectors 4 are sequentially installed in the pre-buried channels 7 of the evacuation platform support 1, then the evacuation platform footplate 2 is sequentially paved on the platform bracket 1.1 of the evacuation platform support 1, in the paving process of the evacuation platform footplate 2, the positioning piece 3 on the platform bracket 1.1 is firstly utilized to be matched with the positioning hole 2.1 at the edge of the evacuation platform footplate 2, the evacuation platform footplate 2 is temporarily fixed to prevent the evacuation platform footplate from sliding on the platform bracket 1.1 to influence the subsequent installation work, then one end of the bolt connector 4 is connected into the pre-buried channels 7 of the evacuation platform support 1, the other end is connected into the connecting grooves 2.1 of the evacuation platform footplate 2, two adjacent evacuation platform footpath plates 2 supported on the same evacuation platform support 1 are fastened to the platform bracket 1.1 of the evacuation platform support 1.

In the utility model, the evacuation platform bracket 1 is preferably made of composite cement-based material; the evacuation platform walkway plate 2 is preferably an RPC plate.

Finally, the above description is only the embodiments of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. A novel evacuation platform comprises evacuation platform supports (1) and evacuation platform footpath plates (2) paved on the evacuation platform supports (1), wherein the evacuation platform supports (1) and the evacuation platform footpath plates (2) are respectively provided with a plurality of the evacuation platform supports (1), a platform bracket (1.1) of each evacuation platform support (1) is correspondingly supported and fixed at the lower part of the splicing part of two adjacent evacuation platform footpath plates (2), and an arc-shaped or straight-shaped mounting rack (1.2) of each evacuation platform support (1) is correspondingly connected and fixed with a subway tunnel segment (10); the method is characterized in that: two adjacent evacuation platform footpath plates (2) supported on the same evacuation platform bracket (1) are connected with the evacuation platform bracket (1) through at least one positioning piece (3) and at least one bolt connecting piece (4).

2. The novel evacuation platform of claim 1, wherein: every evacuation platform pavement board (2) both ends edge has all seted up one locating hole (2.1) at least, and every locating hole (2.1) corresponds and is connected the matching with a setting element (3) for the gliding displacement in platform bracket (1.1) length direction of the evacuation platform support (1) that limits adjacent two evacuation platform pavement boards (2) corresponding with it.

3. A novel evacuation platform according to claim 1 or 2, wherein: at least one connecting groove (2.2) is formed in the edges of two ends of each evacuation platform footpath plate (2), a semicircular hole (2.3) is formed in the bottom of each connecting groove (2.2), at least one embedded channel (7) is formed in the top of a platform bracket (1.1) of each evacuation platform support (1), one end of each bolt connecting piece (4) is correspondingly connected and matched with one connecting groove (2.2), and the other end of each bolt connecting piece is correspondingly connected and matched with one embedded channel (7); the bolt connecting pieces (4) are used for fixing the two adjacent evacuation platform footpath plates (2) on the corresponding platform brackets (1.1) of the evacuation platform bracket (1).

4. The novel evacuation platform of claim 2, wherein: the positioning piece (3) is a positioning lug which is fixedly arranged at the top of a platform bracket (1.1) of the evacuation platform bracket (1), and the positioning lug and the platform bracket (1.1) are integrally formed or detachably assembled and connected; the positioning holes (2.1) are U-shaped holes arranged at the edges of the evacuation platform footpath plates (2).

5. A novel evacuation platform according to claim 3, wherein: bolt connection spare (4) contain a connecting plate (4.1), a T type bolt (4.2) and a nut (4.3), during the use, the tank bottom of connecting plate (4.1) supporting at sparse platform pavement board (2) connecting groove (2.2), the head of T type bolt (4.2) is worn to establish in buried way (7) in advance to with buried way (7) cooperation of sliding, the afterbody of T type bolt (4.2) passes semi-circular hole (2.3) and the screw on connecting plate (4.1) of connecting groove (2.2) tank bottom in proper order, and with nut (4.3) threaded connection.

6. A novel evacuation platform according to claim 4 or 5, wherein: a plurality of anti-skid bulges (2.4) are uniformly distributed on the top of each evacuation platform footpath plate (2).

7. The novel evacuation platform of claim 1, wherein: a first segment connector (5) is arranged at the upper part of the arc-shaped or straight mounting rack (1.2) of each evacuation platform support (1), and a second segment connector (6) is arranged at the lower part of the arc-shaped or straight mounting rack; the middle parts of the first segment connecting piece (5) and the second segment connecting piece (6) are embedded in the corresponding arc-shaped or straight mounting rack (1.2) of the evacuation platform support (1) and are connected with tie bars embedded in the arc-shaped or straight mounting rack (1.2); each of the two ends of the first segment connecting piece (5) and the second segment connecting piece (6) are exposed outside the arc-shaped or straight-shaped mounting rack (1.2) of the evacuation platform support (1) corresponding to the first segment connecting piece and the second segment connecting piece, and are connected and fixed with the subway tunnel segment (10) through chemical anchor bolts (9).

8. The novel evacuation platform of claim 7, wherein:

the first segment connecting piece (5) comprises a first fixing plate (5.1) and a first stiffening plate (5.2) fixed on one side of the first fixing plate (5.1);

the second segment connecting piece (6) comprises a second fixing plate (6.1) and a second stiffening plate (6.2) fixed on one side of the second fixing plate (6.1);

the middle parts of a first stiffening plate (5.2) and a first fixing plate (5.1) of a first segment connecting piece (5) and the middle parts of a second stiffening plate (6.2) and a second fixing plate (6.1) of a second segment connecting piece (6) are all pre-embedded in an arc-shaped or straight-shaped mounting frame (1.2), and the two ends of the first fixing plate (5.1) of the first segment connecting piece (5) and the two ends of the second fixing plate (6.1) of the second segment connecting piece (6) are all exposed outside the arc-shaped or straight-shaped mounting frame (1.2).

9. The novel evacuation platform of claim 8, wherein:

a first tie bar through hole (5.2a) is formed in the first stiffening plate (5.2), and first connecting holes (5.1a) are formed in the two ends of the first fixing plate (5.1) exposed outside the arc-shaped or straight mounting rack (1.2);

and the second stiffening plate (6.2) is provided with a second lacing bar through hole (6.2a), and the two ends of the second fixing plate (6.1) exposed outside the arc-shaped or straight-shaped mounting rack (1.2) are respectively provided with a second connecting hole (6.1 a).

10. The novel evacuation platform of claim 1, wherein: at least one lightening hole (8) is arranged at the junction of the platform bracket (1.1) of each evacuation platform support (1) and the arc-shaped or straight mounting rack (1.2).

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