Typhoon-proof temporary enclosure for coastal area

By adopting the design of base, support components and auxiliary support in the fence structure, the problem of insufficient overturning resistance of the existing fence in typhoons is solved, and efficient support and stability of the fence panel are improved.

CN222949604UActive Publication Date: 2025-06-06THE THIRD CONSTR CO LTD OF CHINA CONSTR THIRD ENG BUREAU +2
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Patent Information

Application Number
CN202421859831.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-01
Publication Date
2025-06-06
Estimated Expiration
2034-08-01

AI Technical Summary

Technical Problem

The existing fence structure has insufficient ability to resist overturning in typhoons, resulting in bending or breaking of the fence surface material, posing safety hazards and economic losses.

Method used

The structural design is adopted including a base, a support assembly and an auxiliary support. The base is fixedly connected to the foundation. The support assembly is composed of the first and second support columns. The connecting rod and the reinforcement rod further enhance the support force. The auxiliary support is retractable to adapt to the fence panels of different heights.

Benefits of technology

Through this design, the overturning resistance and stability of the fence panel are improved, the strength at the connection is enhanced, the damage to the fence by typhoons is reduced, safety is improved and the service life of the fence is extended.

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Abstract

The utility model relates to the technical field of building construction, in particular to an anti-typhoon temporary enclosure in a coastal area. The fence panel is fixedly connected to one side of the base; the supporting assemblies are arranged at intervals in the length direction of the fence panel, and each supporting assembly comprises a first supporting column and a second supporting column; the first supporting columns are parallel to the second supporting columns and parallel to the height direction of the fence panel, the first supporting columns and the second supporting columns are arranged at intervals in the direction parallel to the thickness direction of the fence panel, one ends of the first supporting columns are directly or indirectly connected to the fence panel, the other ends of the first supporting columns are fixedly connected to the base, and the ends of the second supporting columns are fixedly connected with the foundation. Connecting rods are connected between the first supporting columns and the second supporting columns, the connecting rods are perpendicular to the fence panel, and the multiple connecting rods are arranged in the height direction of the fence panel at intervals. The fencing plane material has the effect of improving the anti-overturning force of the fencing plane material.
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Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a temporary enclosure for preventing typhoons in coastal areas. Background Art

[0002] Fencing is an important part of a construction site. It separates the site from the surrounding environment and plays a role in isolation, protection and safety.

[0003] The existing types of enclosures include Class A enclosures, Class B enclosures, and Class C enclosures. The enclosure surface materials mainly use PVC and steel. The structural forms of the three types of enclosures are as follows: Class A enclosures: brick columns or concrete columns are used as support structures and fixed on the ground; Class B enclosures: steel pipe columns and beams are used to form a frame structure, connected with fasteners. Class C enclosures: Made of color steel plates, usually with multiple frame supports.

[0004] With regard to the above-mentioned related technologies, these three types of enclosure structures are of single form, and the enclosure surface materials are made of color steel plates or hanging turf, with insufficient bending resistance. In addition, the connection surface between the enclosure surface material and the vertical column is parallel to the force direction and is only connected by fasteners. The anti-overturning ability is poor, resulting in the enclosure structure being unable to effectively resist the impact of typhoons, causing the enclosure surface material to bend or break at the connection, bringing safety hazards and economic losses. Utility Model Content

[0005] In order to improve the anti-overturning force of the enclosure surface material, the present application provides a temporary typhoon-proof enclosure in coastal areas.

[0006] The present application provides a temporary typhoon protection enclosure in coastal areas, which adopts the following technical solution:

[0007] A temporary enclosure for preventing typhoon in coastal areas, comprising

[0008] enclosure panels;

[0009] A base, wherein the enclosure panel is fixedly connected to one side of the base;

[0010] A support assembly, wherein the support assembly is arranged at intervals along the length direction of the enclosure panel, and the support assembly includes a first support column and a second support column;

[0011] The first support column is parallel to the second support column and parallel to the height direction of the enclosure panel, the first support column and the second support column are arranged at intervals in a direction parallel to the thickness direction of the enclosure panel, one end of the first support column is directly or indirectly connected to the enclosure panel, and the other end is fixedly connected to the base, and the end of the second support column is fixedly connected to the foundation;

[0012] A connecting rod is connected between the first supporting column and the second supporting column. The connecting rod is perpendicular to the enclosure panel. A plurality of connecting rods are arranged at intervals along the height direction of the enclosure panel.

[0013] By adopting the above technical solution, a base is set, one side of the enclosure panel is fitted with the base, and the base is fixedly connected to the foundation, so that the enclosure panel is supported by the base to reduce the possibility of overturning of the enclosure panel. By setting a support assembly, the enclosure panel is further supported by the support assembly, and the connection surface between the support assembly and the enclosure panel is perpendicular to the direction of the wind load, thereby enhancing the strength of the connection and further improving safety.

[0014] Optionally, a reinforcing rod is connected between the first supporting column and the second supporting column, and the reinforcing rod is arranged at an angle.

[0015] By adopting the above technical solution and arranging a reinforcing rod, the reinforcing rod is arranged obliquely, so as to further improve the stability between the first support column and the second support column.

[0016] Optionally, the support assembly further includes a third support column, which is disposed on a side of the enclosure panel away from the first support column, one end of the third support column abuts against the enclosure panel, and the other end contacts the foundation.

[0017] By adopting the above technical solution, in order to achieve stable support for both sides of the enclosure panel at the same time, a third support column is provided to support the side of the enclosure panel away from the first support column.

[0018] Optionally, the enclosure panel includes a first panel and two second panels, the second panel is sandwiched between the two first panels, the first panel is a steel plate, and the second panel is a rock wool sandwich panel.

[0019] By adopting the above technical solution, when a typhoon comes, in order to improve the strength of the enclosure panel, the enclosure panel is composed of a combination of steel plates and rock wool sandwich panels. The rock wool sandwich panels have good thermal insulation and fireproof properties, and the steel plates have good strength and toughness. The steel plates and rock wool sandwich panels are combined into enclosure panels. At the construction site, they can prevent fire while improving the bending resistance of the enclosure panel.

[0020] Optionally, a fixing frame is sleeved on the outer peripheral wall of the enclosure panel to fix the first panel and the second panel, one end of the first support column is fixedly connected to the fixing frame, and the side wall of the first support column is in contact with the first panel.

[0021] By adopting the above technical solution and setting a fixing frame, the first panel and the second panel can be better fixed, and one end of the first support column is fixedly connected to the fixing frame rather than to the enclosure panel, which can reduce damage to the enclosure panel itself and realize the reuse of the enclosure panel.

[0022] Optionally, an auxiliary support member is further included, which is detachably connected to the top of the base, and one side of the auxiliary support member is in contact with the enclosure panel.

[0023] By adopting the above technical solution, the heights of the enclosure panels vary. Enclosure panels of different heights need to be built according to actual construction needs. When the enclosure panels are higher, in order to further improve the support for the enclosure panels, auxiliary support members are provided to provide secondary support for the enclosure panels.

[0024] Optionally, the auxiliary support member is a telescopic structure.

[0025] By adopting the above technical solution, since the heights of the enclosure panels are different, in order to improve the adaptability of the auxiliary support members, the auxiliary support members are of a telescopic structure, and the height of the auxiliary support members can be adjusted to adapt to enclosure panels of different heights.

[0026] Optionally, the auxiliary support member includes a fixed plate and a movable plate, the movable plate is slidably connected to an end of the fixed plate away from the base, and a sliding groove for the movable plate to slide is provided on the fixed plate;

[0027] An elastic sheet is connected to one side of the movable plate close to the enclosure panel, and the extension and retraction direction of the elastic sheet is perpendicular to the enclosure panel. A first accommodating groove for accommodating the elastic sheet is provided on the movable plate. When the movable plate is in the slide groove, the elastic sheet is in the first accommodating groove. When the movable plate is outside the slide groove, one side of the elastic sheet is in contact with the enclosure panel.

[0028] By adopting the above technical solution, by setting up a movable plate and a fixed plate, the movable plate is slid along the height direction of the enclosure panel, thereby extending the height of the auxiliary support member. When facing a typhoon, in order to reduce the impact of the typhoon on the enclosure panel, an elastic sheet is set to prevent the enclosure panel from directly impacting the movable plate. At the same time, by setting up auxiliary support members, when the enclosure panel is damaged, the auxiliary support members can provide secondary resistance to the typhoon.

[0029] Optionally, a mounting seat is connected between the base and the fixed plate, the base is rotatably connected to the mounting seat, the base is parallel to the length direction of the enclosure panel along the rotation axis of the mounting seat, when the fixed plate is rotated to the first position, the fixed plate and the movable plate are both in contact with the second panel, when the fixed plate is rotated to the second position, the end of the movable plate abuts against the foundation.

[0030] By adopting the above technical solution, when the auxiliary support member is not needed, the fixing plate is rotated to abut against the ground, so that the auxiliary support member can improve the stability of the base and further improve the support strength of the enclosure panel.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The present application provides a support assembly and a base, wherein the base supports the enclosure panel to improve the anti-overturning force of the enclosure panel, and the support base further supports the enclosure panel to further improve the stability of the enclosure panel;

[0033] 2. This application sets up auxiliary support members. When the enclosure panel is high, there is no need to raise the base. The enclosure panel is supported twice by the auxiliary support members. The auxiliary support members are telescopic structures, which can further adapt to enclosure panels of different heights.

[0034] 3. The auxiliary support member of the present application is rotatably connected to the base. When the auxiliary support member is not needed, the auxiliary support member can be rotated to abut against the ground, further improving the stability of the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a temporary typhoon-proof enclosure in coastal areas of the present application;

[0036] Figure 2 is a side view of the support assembly and enclosure panel of the present application;

[0037] Figure 3 It is a structural schematic diagram of the third support column and the enclosure panel of the present application;

[0038] Figure 4 yes Figure 1 A magnified view of part A;

[0039] Figure 5 It is a structural schematic diagram of the auxiliary support member of the present application;

[0040] Figure 6 is a structural schematic diagram of the auxiliary support member of the present application connected to the first support column from a first perspective;

[0041] Figure 7 yes Figure 6 A magnified view of part B;

[0042] Figure 8 It is a structural schematic diagram from a second perspective of the connection between the auxiliary support member and the first support column of the present application.

[0043] Explanation of the accompanying drawings: 1. enclosure panel; 11. first panel; 12. second panel; 13. fixed frame; 2. base; 3. support assembly; 31. first support column; 32. second support column; 321. connecting plate; 322. expansion bolt; 33. connecting rod; 34. reinforcing rod; 35. third support column; 4. auxiliary support member; 41. fixing plate; 411. slide groove; 42. movable plate; 421. first accommodating groove; 43. elastic sheet; 44. mounting seat. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-7 This application is described in further detail.

[0045] The present application embodiment discloses a temporary enclosure for preventing typhoons in coastal areas. Figure 1 The temporary typhoon prevention enclosure in coastal areas includes an enclosure panel 1, a base 2 and a support assembly 3. The base 2 is fixedly connected to the ground, one side of the enclosure panel 1 is fixedly connected to the side wall of the base 2, and a plurality of support assemblies 3 are arranged at intervals along the length direction of the enclosure panel 1. The support assembly 3 includes a first support column 31 and a second support column 32. The first support column 31 is parallel to the second support column 32 and parallel to the height direction of the enclosure panel 1, and the first support column 31 and the second support column 32 are arranged at intervals along the thickness direction parallel to the enclosure panel 1. One end of the first support column 31 is directly or indirectly connected to the enclosure panel 1, and the other end is fixedly connected to the base 2. One end of the second support column 32 is fixed to the foundation. The first support column 31 and the second support column 32 are fixedly connected by a connecting rod 33. The connecting rod 33 is perpendicular to the enclosure panel 1. By setting the base 2, the enclosure panel 1 contacts the base 2, so that the enclosure panel 1 is supported by the base 2, thereby further improving the anti-overturning ability of the enclosure panel 1.

[0046] Reference Figure 1 Preferably, in this embodiment, the base 2 is a rectangle cast in concrete, two first support columns 31 are provided, three connecting rods 33 are provided, and the first support column 31 and the second support column 32 are 80mm*80mm square steel.

[0047] Reference Figure 1In order to further improve the supporting force of the first support column 31 and the second support column 32, a plurality of reinforcing rods 34 are connected between the first support column 31 and the second support column 32, and the reinforcing rods 34 are arranged obliquely. Preferably, in this embodiment, two reinforcing rods 34 are provided, one of which is located between the two upper connecting rods 33, and one end of the other reinforcing rod 34 is connected to the side wall of the first support column 31 close to the top wall, and the other end is connected to the side wall of the second support column 32 close to the top wall, so that the two reinforcing rods 34 can further improve the supporting force of the first support column 31 and the second support column 32 on the enclosure panel 1.

[0048] Reference Figure 1 and Figure 2 As a preferred embodiment, in this embodiment, the reinforcing rod is a 40*40mm square steel. According to the "Code for Loads on Building Structures" (GB5009-2001), when calculating the enclosure structure, the standard value of wind load is: ѡ k =β gz μ s μ z ѡ 0 , the basic wind pressure is calculated based on the ninth wind force, 0 =0.3KN / m 3 , we can see from the table that β gz =2.3, μ s =1.3, μ z =0.74,ѡ 0 =0.3, then ѡ k =2.3×1.3×0.74×0.3=0.7KN / m 2 , the wind load is transmitted to the first support column through the enclosure panel. Here, only the stability of the first support column is calculated. The uniformly distributed load borne by each first support column structure is: support q = ѡ k ×3.8=0.7*3.8=2.66KN / m

[0049] Reference Figure 1 and Figure 2 , according to the uniform load bending moment calculation formula M=(q·x 2 ) / 2, the maximum bending moment of 40×40×3mm square steel is 0.955KN / m according to the bending moment calculation software; 40×40×3mm square steel parameters: A=40 2 - (40-1.1×2) 2 =171.16mm 2 , x =5098.6mm 3 ,σ=M max / ѡ x =0.955×1000×1000 / 5098.6=187.31N / mm 2<[σ]=215MPa, where σ is the maximum stress that the square steel can withstand, and 215MPa is the yield strength of the square steel. The yield strength range is 215-235MPa, and the minimum value of 215MPa is taken in this application;

[0050] Reference Figure 1 and Figure 2 , the maximum bending moment of 80×80×3mm square steel is 0.85KN / m, so it also meets the requirements; the cross-sectional parameter of 40×4mm angle steel diagonal brace is A=304mm2, and the axial force is 5.652KN, σ=FN / A=5.652×1000 / 304=18.59N / mm 2 <[σ]=215MPa, therefore, the setting of the support assembly can withstand at least a Category 9 typhoon.

[0051] Reference Figure 3 It should be noted that the side of the enclosure panel 1 away from the first support column 31 is the windward side. In order to further improve the support for the enclosure panel 1, the temporary typhoon prevention enclosure in coastal areas also includes a third support column 35. The third support column 35 is arranged on the side of the enclosure panel 1 away from the first support column 31. One end of the third support column 35 is abutted against the enclosure panel 1, and the other end is abutted against the ground.

[0052] Reference Figure 3 In order to improve the bending resistance of the enclosure panel 1, the enclosure panel 1 includes a first panel 11 and a plurality of second panels 12. The first panel 11 is sandwiched between two second panels 12. In this embodiment, the first panel 11 is made of rock wool core material, and the second panel 12 is made of steel. The rock wool sandwich panel has good fireproof and heat-insulating properties, and steel has good strength and plasticity. By arranging the first panel 11 and the second panel 12, the enclosure panel 1 has a certain strength and can also be fireproof and heat-insulating.

[0053] Reference Figure 3 In order to fix the first panel 11 and the second panel 12, a fixing frame 13 is fixedly connected to the outer periphery of the enclosure panel 1, the inner peripheral wall of the fixing frame 13 is fixedly connected to the outer peripheral wall of the enclosure panel 1, one end of the first support column 31 is fixedly connected to the fixing frame 13, and the second panel 12 is in contact with the side wall of the first support column 31. In this embodiment, the fixing frame 13 is a steel plate.

[0054] Reference Figure 4 In order to fix the second support column 32, a connecting plate 321 is fixedly connected to the bottom of the second support column 32. The connecting plate 321 is horizontally arranged and fixed to the foundation through expansion bolts 322. An embedded plate (not shown in the figure) is buried in the foundation. The connecting plate and the embedded plate are fixedly connected by the expansion bolts 322, thereby achieving stable support of the second support column 32.

[0055] Reference Figure 5 Since the heights of the enclosure panels 1 vary, when the enclosure panel 1 is set higher, in order to further improve the support for the enclosure panel 1, the temporary typhoon prevention enclosure in coastal areas also includes an auxiliary support member 4, and the auxiliary support member 4 is connected to the top of the base 2, and one side of the auxiliary support member 4 is in contact with the second panel 12. When the enclosure panel 1 is higher, there is no need to support the enclosure panel by increasing the height of the base 2, and the enclosure panel 1 is supported by setting the auxiliary support member 4.

[0056] Reference Figure 6 In order to improve the applicability of the auxiliary support member 4, the auxiliary support member 4 is a telescopic structure. Specifically, the auxiliary support member 4 includes a fixed plate 41 and a movable plate 42. A slide groove 411 is provided on the side of the fixed plate 41 away from the base 2 along the height direction of the enclosure panel 1. The movable plate 42 is slidably connected to the fixed plate 41 in the slide groove 411 along the height direction of the enclosure panel 1 to extend the height of the auxiliary support member 4, thereby better supporting the enclosure panel 1.

[0057] Reference Figure 6 , Figure 7 and Figure 8 In order to mitigate the impact of typhoon on the enclosure panel 1, a plurality of elastic sheets 43 are connected to the side of the movable plate 42 close to the enclosure panel 1. A first accommodating groove 421 for accommodating the elastic sheet 43 is opened on the side of the movable plate 42 close to the enclosure panel 1. The extension direction of the elastic sheet 43 is perpendicular to the enclosure panel 1. The side of the elastic sheet 43 away from the movable plate 42 abuts against the second panel 12 of the enclosure panel 1. When the movable plate 42 is located in the slide groove 411, the elastic sheet 43 is located in the first accommodating groove 421. When the movable plate 42 is located outside the slide groove 411, the elastic sheet 43 is partially located outside the first accommodating groove 421 and contacts the second panel 12. When the typhoon blows towards the enclosure panel 1, the elastic sheet 43 buffers the movable plate 42 directly. At the same time, by setting the auxiliary support member 4, when the enclosure panel 1 is damaged, the auxiliary support member 4 can resist the typhoon for a second time.

[0058] Reference Figure 6 and Figure 8In order to further improve the supporting force of the first support column 31 on the enclosure panel 1, the auxiliary support member 4 is rotatably connected to the base 2, and the auxiliary support member 4 is parallel to the length direction of the enclosure panel 1 along the rotation axis of the base 2. Specifically, a mounting seat 44 is connected between the fixing plate 41 of the auxiliary support member 4 and the base 2, and the fixing plate 41 is rotatably connected to the mounting seat 44. When the auxiliary support member 4 is rotated to the first position, the auxiliary support member 4 contacts the enclosure panel 1. When the auxiliary support member 4 is rotated to the second position, the end of the auxiliary support member 4 abuts against the ground. When the auxiliary support member 4 is not needed, the auxiliary support member 4 is rotated to the side away from the enclosure panel 1 so that the auxiliary support member 4 abuts against the ground, thereby improving the stability of the base 2 by the auxiliary support member 4, and further supporting the enclosure panel 1. By setting the auxiliary support member 4, when enclosure panels 1 of different heights are set, the supporting force of the enclosure panel 1 can be further improved.

[0059] The implementation principle of a temporary typhoon-proof enclosure in coastal areas of the present application embodiment is as follows: one side of the enclosure panel 1 is abutted against the base 2, and the support assembly 3 is installed. The first support column 31 is fixedly connected to the base 2 and in contact with the enclosure panel 1, and the second support column 32 is fixedly connected to the ground. The first support column 31 and the second support column 32 are fixedly connected by a connecting rod 33 and a reinforcing rod 34 to achieve support for the enclosure panel 1;

[0060] When the enclosure panel 1 is higher, an auxiliary support member 4 is set, and a movable plate 42 is slid along the height direction of the enclosure panel 1 to extend the height of the auxiliary support member 4 to increase the supporting force on the enclosure panel 1. When the auxiliary support member 4 is not needed, the auxiliary support member 4 is rotated to abut against the ground so that the auxiliary support member 4 supports the enclosure panel 1 through the first support column 31.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A temporary enclosure for typhoon prevention in coastal areas, characterized by: include Enclosure panel (1); A base (2), wherein the enclosure panel (1) is fixedly connected to one side of the base (2); A support assembly (3), wherein the support assembly (3) is arranged at intervals along the length direction of the enclosure panel (1), and the support assembly (3) comprises a first support column (31) and a second support column (32); The first support column (31) is parallel to the second support column (32) and parallel to the height direction of the enclosure panel (1); the first support column (31) and the second support column (32) are arranged at intervals in a direction parallel to the thickness of the enclosure panel (1); one end of the first support column (31) is directly or indirectly connected to the enclosure panel (1), and the other end is fixedly connected to the base (2); the end of the second support column (32) is fixedly connected to the foundation; A connecting rod (33) is connected between the first supporting column (31) and the second supporting column (32); the connecting rod (33) is perpendicular to the enclosure panel (1); and a plurality of connecting rods (33) are arranged at intervals along the height direction of the enclosure panel (1).

2. A temporary enclosure for preventing typhoons in coastal areas according to claim 1, characterized in that: A reinforcing rod (34) is connected between the first supporting column (31) and the second supporting column (32), and the reinforcing rod (34) is arranged obliquely.

3. The temporary enclosure for preventing typhoon in coastal areas according to claim 1 is characterized by: The support assembly (3) further comprises a third support column (35), wherein the third support column (35) is arranged on a side of the enclosure panel (1) away from the first support column (31), and one end of the third support column (35) is in contact with the enclosure panel (1), and the other end is in contact with the foundation.

4. The temporary enclosure for preventing typhoon in coastal areas according to claim 1 is characterized by: The enclosure panel (1) comprises a first panel (11) and two second panels (12), wherein the second panels (12) are sandwiched between the two first panels (11), the first panel (11) is a steel plate, and the second panel (12) is a rock wool sandwich panel.

5. A temporary enclosure for preventing typhoons in coastal areas according to claim 4, characterized in that: The outer peripheral wall of the enclosure panel (1) is sleeved with a fixing frame (13) to fix the first panel (11) and the second panel (12); one end of the first support column (31) is fixedly connected to the fixing frame (13); and the side wall of the first support column (31) is in contact with the first panel (11).

6. The temporary enclosure for preventing typhoon in coastal areas according to claim 4 is characterized by: It also comprises an auxiliary support member (4), wherein the auxiliary support member (4) is detachably connected to the top of the base (2), and one side of the auxiliary support member (4) is in contact with the enclosure panel (1).

7. A temporary enclosure for preventing typhoons in coastal areas according to claim 6, characterized in that: The auxiliary support member (4) is a telescopic structure.

8. The temporary enclosure for preventing typhoon in coastal areas according to claim 7 is characterized by: The auxiliary support member (4) comprises a fixed plate (41) and a movable plate (42), wherein the movable plate (42) is slidably connected to an end of the fixed plate (41) away from the base (2), and a sliding groove (411) is provided on the fixed plate (41) for the movable plate (42) to slide; An elastic sheet (43) is connected to one side of the movable plate (42) close to the enclosure panel (1); the extension and retraction direction of the elastic sheet (43) is perpendicular to the enclosure panel (1); a first receiving groove (421) for receiving the elastic sheet (43) is provided on the movable plate (42); when the movable plate (42) is located in the slide groove (411), the elastic sheet (43) is located in the first receiving groove (421); when the movable plate (42) is located outside the slide groove (411), one side of the elastic sheet (43) is in contact with the enclosure panel (1).

9. A temporary enclosure for preventing typhoons in coastal areas according to claim 8, characterized in that: A mounting seat (44) is connected between the base (2) and the fixed plate (41); the base (2) is rotatably connected to the mounting seat (44); the base (2) is parallel to the length direction of the enclosure panel (1) along the rotation axis of the mounting seat (44); when the fixed plate (41) is rotated to a first position, the fixed plate (41) and the movable plate (42) are both in contact with the second panel (12); when the fixed plate (41) is rotated to a second position, the end of the movable plate (42) is in contact with the foundation.