CN111589008A

CN111589008A - Safety protection type building straight-jump escape device

Info

Publication number: CN111589008A
Application number: CN202010480555.6A
Authority: CN
Inventors: 陈韬
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2020-08-28

Abstract

The invention provides a safety protection type building straight jump type escape device, which relates to the field of fire fighting escape and solves the problems that the auxiliary type suspension and fixation of an installation structure cannot be realized during the installation, the coexistence of a fire fighting channel and ground support cannot be realized, and the automatic adaptation after the deformation of a switching structure cannot be realized; the problem that reasonable coexistence of diversified buffer structures cannot be realized in a limited space. A safety protection type building straight jump type escape device comprises a bottom plate and a clamping bulge; the bottom plate is of a rectangular plate-shaped structure. Because of the left end face, the bottom right-hand member face and the bottom face of the protruding bottom of joint all do not all with the draw-in groove contact, and the clearance between the two is 0.5cm to when shock mount exclusive use leads to the protruding bottom of joint to slightly warp, still can't influence the slip grafting between joint arch and the draw-in groove.

Description

Safety protection type building straight-jump escape device

Technical Field

The invention belongs to the technical field of fire-fighting escape, and particularly relates to a safety protection type building straight-jump escape device.

Background

At present, after a fire disaster occurs to a traditional building, the fire stairs installed on the side wall body of the building are used for escaping, when the fire disaster occurs to the building, residents living in the building can reach the fire stair opening through the fire passage, and the residents can escape by using the fire stairs. However, when a fire disaster occurs in a building and the spread speed of the fire disaster is high, the ordinary fire stairs cannot enable residents living on high floors to quickly run to an empty space below the building.

As in application No.: the invention belongs to the technical field of escape, and particularly relates to a building direct-jump type escape device which comprises a driving mechanism, a second C-shaped spring, a pedal, a triangular block, a trigger block, a limiting plate, a second fixing plate, a first fixing plate, a top plate, a damping wheel mechanism, a first C-shaped spring, a driving gear, a first limiting strip, a second limiting strip, a first rack plate, a second rack plate and the like, wherein a trapped person steps on the pedal, the pedal after being pressed down enables the driving gear to be meshed with the first rack plate, then the driving gear drives a sliding plate to slide out of a sliding plate groove through the first rack plate, the trapped person strides on the sliding plate from the pedal, and finally jumps to an escape airbag cushion from the sliding plate to escape, so that the trapped person can reduce the escape time of the traditional escape stair, and the escape probability of the trapped person is greatly improved; the invention has simple mechanism and better safe use effect.

The building escape device similar to the above application has the following defects at present:

one is that although the existing device can realize the installation and use in the fire fighting access, on one hand, the auxiliary suspension and fixation of the installation structure cannot be realized during the installation, and on the other hand, the coexistence of the fire fighting access and the ground support and the automatic adaptation after the transformation of the switching structure cannot be realized; moreover, when the ground support is used, reasonable coexistence of diversified buffer structures cannot be realized in a limited space.

Therefore, in view of the above, research and improvement are made for the existing structure and defects, and a safety protection type building straight jump type escape device is provided, so as to achieve the purpose of higher practical value.

Disclosure of Invention

In order to solve the technical problems, the invention provides a safety protection type building straight jump escape device, which aims to solve the problems that although the existing device can realize the installation and use in a fire fighting channel, on one hand, the auxiliary suspension and fixation of an installation structure cannot be realized during the installation, on the other hand, the coexistence of the fire fighting channel and the ground support and the automatic adaptation after the transformation of a switching structure cannot be realized; moreover, when the ground support is used, the reasonable coexistence of diversified buffer structures cannot be realized in a limited space.

The invention relates to a safety protection type building straight jump type escape device, which is achieved by the following specific technical means:

a safety protection type building straight jump type escape device comprises a bottom plate and a clamping bulge; the bottom plate is of a rectangular plate-shaped structure, four universal wheels are mounted on the bottom end face of the bottom plate, and four supporting structures are further mounted on the bottom plate; the bottom plate is provided with a first damping structure, the bottom plate is also provided with a second damping structure, and the first damping structure is provided with a damping seat; the left end face, the right end face and the bottom end face of the bottom of the clamping protrusion are not in contact with the clamping groove, and the gap between the left end face, the right end face and the bottom end face is 0.5cm, so that when the bottom of the clamping protrusion is slightly deformed due to the independent use of the damping seat, the sliding insertion between the clamping protrusion and the clamping groove cannot be influenced; the clamping protrusion comprises a cleaning groove, the head end of the clamping protrusion is provided with the cleaning groove, the cleaning groove is of a V-shaped structure, and when the clamping protrusion slides and is inserted in the cleaning groove, residues in the cleaning groove are automatically collected, so that the residues in the cleaning groove can be collected and discharged through the rectangular hole; the shock absorption seat is provided with a fixing structure, and the shock absorption seat is further provided with an air bag.

Furthermore, the supporting structure comprises a threaded rod A and a base, the threaded rod A is in threaded connection with the bottom plate, the head end of the threaded rod A is rotatably connected with the base, and the bottom end of the base is welded with anti-skid protrusions in an annular array shape; when the base is contacted with the ground and the threaded rod A is continuously screwed, the friction force between the threaded rod A and the base is smaller than the friction force between the base and the ground.

Furthermore, the first damping structure comprises four sliding rods, a rectangular seat plate and an elastic piece, and the four sliding rods are respectively welded at four corner positions of the top end face of the bottom plate; the rectangular seat board is connected to the four sliding rods in a sliding mode, the four sliding rods are sleeved with the elastic piece in a sleeved mode, and the sliding rods and the elastic piece form a rectangular seat board elastic buffering structure.

Furthermore, the rectangular base plate comprises a clamping groove and rectangular holes, the clamping groove is welded on the front end face of the rectangular base plate, the tail end position of the bottom of each clamping groove is provided with one rectangular hole, and the clamping groove is of a middle-shaped structure.

Furthermore, the second damping structure comprises an elastic telescopic rod and a damping sheet, the elastic telescopic rod is welded at the center of the top end face of the bottom plate, and the damping sheet with an arc-shaped structure is welded on the top end face of the elastic telescopic rod; the damping piece of arc structure and the contact of rectangle bedplate bottom end face, and the dual buffer structure of formation jointly of elastic telescopic link and arc structure's damping piece.

Furthermore, the damping seat comprises clamping bulges and elastic clamping pins, the two clamping bulges are symmetrically welded on the bottom end face of the damping seat, and the clamping bulges are of a middle-shaped structure; the clamping protrusions are matched with the clamping grooves; the terminal surface passes through an elastic clamping pin of screw fixedly connected with before the shock attenuation seat, just the elastic clamping pin head end is the slope column structure to accomplish the back elastic clamping pin and the shock attenuation seat when the joint arch finishes with the draw-in groove joint and be the joint state of shutting between elastic clamping pin and the shock attenuation seat.

Furthermore, the shock absorption seat also comprises an elastic block and a rectangular block; two rectangular blocks are symmetrically welded on the shock absorption seat, elastic blocks with two rectangular structures are symmetrically inlaid on the shock absorption seat, and the bottom end face of each elastic block is in contact with the head end of the sliding rod when the shock absorption seat is stressed to move downwards.

Furthermore, the fixing structure comprises four threaded pipes B and a threaded rod B, the four threaded pipes B are symmetrically in threaded connection with the two rectangular blocks, and the head ends of the threaded pipes B are not provided with threads; every screwed pipe B is last all threaded connection has a threaded rod B to when fixing through screwed pipe B and threaded rod B and wall body, screwed pipe B can share the atress of threaded rod B, and threaded rod B can realize further fixed.

Further, the gasbag includes spacing arch, be provided with four spacing archs on the gasbag for the rectangle array form, and four spacing archs have constituteed protective structure jointly.

Compared with the prior art, the invention has the following beneficial effects:

improved the major structure of this device, this dress is modular structure, can realize through the dismouting that ground is placed and is used and fire control passageway in use, and can avoid the dead phenomenon of card at the dismouting in-process to can realize the automatic clearance of sliding tray, specifically as follows: firstly, each threaded pipe B is in threaded connection with a threaded rod B, so that when the threaded pipes B and the threaded rods B are fixed with a wall body, the threaded pipes B can bear stress of the threaded rods B, and the threaded rods B can be further fixed; secondly, the left end face, the right end face and the bottom end face of the bottom of the clamping protrusion are not in contact with the clamping groove, and the gap between the left end face and the bottom end face is 0.5cm, so that when the bottom of the clamping protrusion is slightly deformed due to the independent use of the shock absorption seat, the sliding insertion between the clamping protrusion and the clamping groove cannot be influenced; and thirdly, a cleaning groove is formed in the end of the clamping protrusion, the cleaning groove is of a V-shaped structure, and when the clamping protrusion slides and is inserted in the cleaning groove, residues in the cleaning groove are automatically collected, so that the residues in the cleaning groove can be collected and discharged through the rectangular hole.

The buffer structure is improved, and coexistence of diversified buffer structures can be realized in a limited space through improvement, which is specifically as follows: firstly, the sliding rod and the elastic piece jointly form a rectangular seat plate elastic buffer structure, so that the first buffer is realized; secondly, when the shock absorption seat is stressed to move downwards, the bottom end face of the elastic block is contacted with the head end of the sliding rod, so that auxiliary shock absorption is realized by the cooperation of the elastic block and the sliding rod; and thirdly, the double-buffering structure is formed by the elastic telescopic rod and the damping sheet with the arc-shaped structure, so that the damping effect can be optimized.

The airbag structure is improved, four limiting protrusions are arranged on the airbag in a rectangular array shape, and the four limiting protrusions jointly form a protection structure, so that the limiting protrusions can limit the rolling of people after the people drop on the airbag.

Drawings

Fig. 1 is a schematic axial view of the present invention.

Fig. 2 is a schematic front view of the present invention.

Fig. 3 is an enlarged schematic view of fig. 2 at a.

Fig. 4 is an enlarged schematic view of fig. 2B according to the present invention.

FIG. 5 is an enlarged, partially cross-sectioned, schematic view of the present invention with the base plate and support structure removed.

Fig. 6 is an enlarged view of the structure of fig. 5C according to the present invention.

Fig. 7 is an enlarged view of fig. 5D according to the present invention.

Fig. 8 is a schematic view of the present invention in an axially disassembled configuration as shown in fig. 5.

Fig. 9 is an enlarged view of fig. 8 at E according to the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a base plate; 2. a support structure; 201. a threaded rod A; 202. a base; 3. a first shock-absorbing structure; 301. a slide bar; 302. a rectangular seat plate; 30201. a card slot; 30202. a rectangular hole; 303. an elastic member; 4. a second shock-absorbing structure; 401. an elastic telescopic rod; 402. a damping sheet; 5. a shock absorbing seat; 501. clamping the bulges; 50101. cleaning the tank; 502. an elastic block; 503. an elastic bayonet lock; 504. a rectangular block; 6. a fixed structure; 601. a threaded pipe; 602. a threaded rod B; 7. an air bag; 701. and a limiting bulge.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in figures 1 to 9:

the invention provides a safety protection type building straight jump type escape device, which comprises a bottom plate 1 and a clamping protrusion 501; the bottom plate 1 is of a rectangular plate-shaped structure, four universal wheels are mounted on the bottom end face of the bottom plate 1, and four supporting structures 2 are further mounted on the bottom plate 1; a first damping structure 3 is arranged on the bottom plate 1, a second damping structure 4 is also arranged on the bottom plate 1, and a damping seat 5 is arranged on the first damping structure 3; referring to fig. 4, the left end face, the right end face and the bottom end face of the bottom of the clamping protrusion 501 are not in contact with the clamping groove 30201, and the gap between the left end face, the right end face and the bottom end face is 0.5cm, so that when the bottom of the clamping protrusion 501 slightly deforms due to the independent use of the shock absorption seat 5, the sliding insertion between the clamping protrusion 501 and the clamping groove 30201 cannot be influenced; referring to fig. 5 and 6, the clamping protrusion 501 comprises a cleaning slot 50101, the head end of the clamping protrusion 501 is provided with the cleaning slot 50101, and the cleaning slot 50101 is of a V-shaped structure, so that when the clamping protrusion 501 is slidably inserted in the cleaning slot 50101, residues in the cleaning slot 50101 are automatically collected, and the residues in the cleaning slot 50101 can be collected and discharged through the rectangular hole 30202; the shock absorption seat 5 is provided with a fixing structure 6, and the shock absorption seat 5 is also provided with an air bag 7.

Referring to fig. 2 and 3, the supporting structure 2 includes a threaded rod a201 and a base 202, the threaded rod a201 is in threaded connection with the bottom plate 1, the base 202 is rotatably connected to the head end of the threaded rod a201, and the anti-skid protrusions are welded to the bottom end surface of the base 202 in an annular array; after the base 202 is in contact with the ground and the threaded rod A201 is screwed continuously, the friction force between the threaded rod A201 and the base 202 is smaller than the friction force between the base 202 and the ground, so that the aim of saving labor is fulfilled.

Referring to fig. 2, the first shock absorbing structure 3 includes four sliding rods 301, a rectangular seat plate 302 and an elastic member 303, the number of the sliding rods 301 is four, and the four sliding rods 301 are respectively welded at four corner positions of the top end surface of the bottom plate 1; the rectangular seat plate 302 is slidably connected to the four sliding rods 301, the four sliding rods 301 are sleeved with an elastic part 303, and the sliding rods 301 and the elastic part 303 jointly form an elastic buffer structure of the rectangular seat plate 302.

Referring to fig. 4, the rectangular seat plate 302 includes a slot 30201 and a rectangular hole 30202, the slot 30201 is welded on the front end surface of the rectangular seat plate 302, a rectangular hole 30202 is opened at the tail end position of the bottom of each slot 30201, and the slot 30201 is of a "middle" shape.

Referring to fig. 2, the second shock-absorbing structure 4 includes an elastic telescopic rod 401 and a shock-absorbing plate 402, the elastic telescopic rod 401 is welded at the center of the top end surface of the bottom plate 1, and the top end surface of the elastic telescopic rod 401 is welded with the shock-absorbing plate 402 having an arc structure; the damping piece 402 of arc structure and the contact of rectangle bedplate 302 bottom end face, and elasticity telescopic link 401 and the damping piece 402 of arc structure constitute double buffer structure jointly to can optimize the shock attenuation effect.

Referring to fig. 1 and 2, the shock absorbing base 5 includes a clamping protrusion 501 and an elastic clamping pin 503, two clamping protrusions 501 are symmetrically welded on the bottom end surface of the shock absorbing base 5, and the clamping protrusions 501 are in a structure of a shape like a Chinese character 'zhong'; the clamping protrusion 501 is matched with the clamping groove 30201; the terminal surface passes through an elastic clamping pin 503 of screw fixedly connected with before the cushion socket 5, and the elastic clamping pin 503 head end is the slope column structure to accomplish back elastic clamping pin 503 and cushion socket 5 when joint arch 501 and draw-in groove 30201 joint and lock the state for the joint between, thereby improved the convenience when installing between cushion socket 5 and the rectangle bedplate 302.

Referring to fig. 2, the damper base 5 further includes an elastic block 502 and a rectangular block 504; two rectangular blocks 504 are symmetrically welded on the shock absorption seat 5, two elastic blocks 502 with rectangular structures are symmetrically inlaid on the shock absorption seat 5, and when the shock absorption seat 5 is stressed to move downwards, the bottom end face of each elastic block 502 is in contact with the head end of the sliding rod 301, so that auxiliary shock absorption is realized by matching the elastic blocks 502 with the sliding rod 301.

Referring to fig. 2, the fixing structure 6 includes four threaded pipes B601 and a threaded rod B602, the four threaded pipes B601 are symmetrically screwed on the two rectangular blocks 504, and the head end of the threaded pipe B601 is not threaded; each threaded pipe B601 is in threaded connection with a threaded rod B602, so that when the threaded pipes B601 and the threaded rods B602 are fixed with a wall body, the threaded pipes B601 can bear stress of the threaded rods B602, and the threaded rods B602 can be further fixed.

Referring to fig. 5, the airbag 7 includes a limiting protrusion 701, four limiting protrusions 701 are arranged on the airbag 7 in a rectangular array, and the four limiting protrusions 701 jointly form a protection structure, so that the limiting protrusion 701 can play a role in limiting the rolling of a person after the person falls on the airbag 7.

The specific use mode and function of the embodiment are as follows:

when the air bag 7 is used, when a person falls on the air bag 7, firstly, the air bag 7 is provided with four limiting protrusions 701 in a rectangular array shape, and the four limiting protrusions 701 jointly form a protective structure, so that the limiting protrusions 701 can play a role in limiting the rolling of the person after the person falls on the air bag 7; secondly, the sliding rod 301 and the elastic piece 303 jointly form an elastic buffer structure of the rectangular seat plate 302, so that the first buffer is realized; secondly, when the shock absorption seat 5 is forced to move downwards, the bottom end surface of the elastic block 502 is contacted with the head end of the sliding rod 301, so that the matching of the elastic block 502 and the sliding rod 301 realizes auxiliary shock absorption; thirdly, the elastic telescopic rod 401 and the shock absorption sheet 402 with the arc-shaped structure jointly form a double-buffering structure, so that the shock absorption effect can be optimized;

when the device needs to be installed in a fire fighting channel for use, each threaded pipe B601 is in threaded connection with a threaded rod B602, so that when the device is fixed with a wall body through the threaded pipes B601 and the threaded rods B602, the threaded pipes B601 can bear stress of the threaded rods B602, and the threaded rods B602 can be further fixed;

when the first damping structure 3 and the damping seat 5 need to be disassembled and assembled, firstly, the left end face, the right end face and the bottom end face of the bottom of the clamping protrusion 501 are not in contact with the clamping groove 30201, and the gap between the left end face, the right end face and the bottom end face is 0.5cm, so that when the bottom of the clamping protrusion 501 slightly deforms due to independent use of the damping seat 5, sliding insertion between the clamping protrusion 501 and the clamping groove 30201 cannot be influenced; secondly, because the head end of the clamping protrusion 501 is provided with a cleaning groove 50101, and the cleaning groove 50101 is of a V-shaped structure, when the clamping protrusion 501 is slidably inserted in the cleaning groove 50101, residues in the cleaning groove 50101 are automatically collected, so that the residues in the cleaning groove 50101 can be collected and discharged through the rectangular hole 30202.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a building of safety protection formula is jump formula escape device directly which characterized in that: comprises a bottom plate (1) and a clamping bulge (501); the bottom plate (1) is of a rectangular plate-shaped structure, four universal wheels are mounted on the bottom end face of the bottom plate (1), and four supporting structures (2) are further mounted on the bottom plate (1); a first damping structure (3) is arranged on the bottom plate (1), a second damping structure (4) is further arranged on the bottom plate (1), and a damping seat (5) is mounted on the first damping structure (3); the left end face, the right end face and the bottom end face of the bottom of the clamping protrusion (501) are not in contact with the clamping groove (30201), and a gap between the left end face and the bottom end face is 0.5 cm; the clamping protrusion (501) comprises a cleaning groove (50101), the head end of the clamping protrusion (501) is provided with the cleaning groove (50101), the cleaning groove (50101) is of a V-shaped structure, and when the clamping protrusion (501) is slidably inserted in the cleaning groove (50101), residues in the cleaning groove (50101) are in an automatic collecting state; the shock absorption seat (5) is provided with a fixing structure (6), and the shock absorption seat (5) is further provided with an air bag (7).

2. The safety protection type building straight jump escape device according to claim 1, wherein: the supporting structure (2) comprises a threaded rod A (201) and a base (202), the threaded rod A (201) is in threaded connection with the bottom plate (1), the head end of the threaded rod A (201) is rotatably connected with the base (202), and the bottom end of the base (202) is welded with anti-skid protrusions in an annular array shape; when the base (202) is in contact with the ground and the threaded rod A (201) is continuously screwed, the friction force between the threaded rod A (201) and the base (202) is smaller than the friction force between the base (202) and the ground.

3. The safety protection type building straight jump escape device according to claim 1, wherein: the first damping structure (3) comprises four sliding rods (301), a rectangular seat plate (302) and elastic pieces (303), wherein the four sliding rods (301) are respectively welded at four corner positions of the top end face of the bottom plate (1); rectangle bedplate (302) sliding connection is on four slide bar (301), and all cup joints one elastic component (303) on four slide bar (301) to slide bar (301) and elastic component (303) have constituteed rectangle bedplate (302) elasticity buffer structure jointly.

4. A safety protection type building straight jump escape device as claimed in claim 3, wherein: the rectangular seat plate (302) comprises a clamping groove (30201) and rectangular holes (30202), the clamping groove (30201) is welded on the front end face of the rectangular seat plate (302), the tail end of the bottom of each clamping groove (30201) is provided with one rectangular hole (30202), and the clamping groove (30201) is of a structure shaped like a Chinese character 'zhong'.

5. The safety protection type building straight jump escape device according to claim 1, wherein: the second damping structure (4) comprises an elastic telescopic rod (401) and a damping sheet (402), the elastic telescopic rod (401) is welded at the center of the top end face of the bottom plate (1), and the damping sheet (402) with an arc-shaped structure is welded on the top end face of the elastic telescopic rod (401); the damping piece (402) of the arc-shaped structure is in contact with the bottom end face of the rectangular seat plate (302), and the elastic telescopic rod (401) and the damping piece (402) of the arc-shaped structure jointly form a double-buffering structure.

6. The safety protection type building straight jump escape device according to claim 1, wherein: the shock absorption seat (5) comprises clamping protrusions (501) and elastic clamping pins (503), the two clamping protrusions (501) are symmetrically welded on the bottom end surface of the shock absorption seat (5), and the clamping protrusions (501) are of a middle-shaped structure; the clamping protrusion (501) is matched with the clamping groove (30201); the front end face of the shock absorption seat (5) is fixedly connected with an elastic clamping pin (503) through a screw, the head end of the elastic clamping pin (503) is of an inclined structure, and a clamping locking state is formed between the elastic clamping pin (503) and the shock absorption seat (5) after clamping of the clamping protrusion (501) and the clamping groove (30201) is completed.

7. The safety protection type building straight jump escape device according to claim 1, wherein: the shock absorption seat (5) further comprises an elastic block (502) and a rectangular block (504); two rectangular blocks (504) are symmetrically welded on the shock absorption seat (5), elastic blocks (502) with two rectangular structures are symmetrically inlaid on the shock absorption seat (5), and when the shock absorption seat (5) is stressed to move downwards, the bottom end face of each elastic block (502) is in contact with the head end of the sliding rod (301).

8. The safety protection type building straight jump escape device according to claim 1, wherein: the fixing structure (6) comprises threaded pipes B (601) and threaded rods B (602), four threaded pipes B (601) are arranged, the four threaded pipes B (601) are symmetrically in threaded connection with the two rectangular blocks (504), and the head ends of the threaded pipes B (601) are not provided with threads; each threaded pipe B (601) is in threaded connection with a threaded rod B (602).

9. The safety protection type building straight jump escape device according to claim 1, wherein: gasbag (7) are including spacing arch (701), be rectangular array form on gasbag (7) and be provided with four spacing arch (701), and four spacing arch (701) have constituteed protective structure jointly.