Combined baffle for flood control, and mounting method and usage method

Abstract

A combined baffle for flood control, and a mounting method and a usage method. The combined baffle for flood control comprises at least three connected baffles, wherein a rotary pair and a limiting guide structure are provided between connected baffles, such that adjacent baffles rotate from being perpendicular to each other to being attached to each other, and the sequentially connected baffles sequentially rotate and are folded into a Z shape and rotate until the baffles are attached to each other, and when the connected baffles rotate until the baffles are perpendicular to each other, the baffles are connected to form steps and successively extend in a vertical direction and a horizontal direction. The usage method comprises: connecting and forming baffles by means of collision bead snap-fasteners, and after the baffles rotate and are folded and stored or rotate until the baffles are perpendicular to each other, locking and fixing the baffles and entering a usage state; and pressing devices on two sides of the collision bead snap-fasteners to relieve a locked and fixed state, folding the baffles and then storing same, and pulling open the collision bead snap-fasteners in the direction of each tenon to disassemble a baffle group. In the mounting method, each tenon and each mortise are concentric arcs and each use a collision bead snap-fastener of a connecting device as the center; when the tenon is rotationally pulled out of the mortise, adjacent baffles overlap; and after the tenon is rotationally inserted into the mortise, the baffles are unfolded, and the adjacent baffles are perpendicular to each other.

Description

A flood prevention combined baffle and its installation method and use method Technical Field

[0001] The present invention relates to the technical field of flood control in water conservancy projects, and in particular to a combined flood control baffle and an installation method and a use method thereof. Background Art

[0002] With the rapid development of urban construction and the impact of extreme weather, more and more areas are facing increased flood control standards and the pressure to protect people's lives and property. However, the flood control walls on river and lake banks cannot meet the flood control requirements. During the flood season, flood control must meet temporary flood control requirements while being convenient and fast to construct.

[0003] At present, flood control materials mostly use flood control sandbags and some flood control baffle structures. Ordinary sandbags and flood control baffle structures are often large in size, heavy in weight, and complex in structure, and are difficult to install, disassemble, store and transport.

[0004] Summary of the Invention

[0005] In view of this, facing the shortcomings of the existing technology, the purpose of the present invention is to provide a flood-proof combined baffle and an installation method and a usage method, which has the characteristics of small size, light weight, and simple structure. It can achieve self-stability by relying on its own structural characteristics and the water pressure and water gravity on the water-facing side. It is easy to install and disassemble, and is conducive to transportation and storage. It is a flood-proof combined baffle that can be used to temporarily raise the flood wall, and is also suitable for flat embankment structures with a vertical air-facing surface on the water side.

[0006] This application aims to solve one of the problems in the background technology.

[0007] The technical solution adopted by the present invention is: In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a flood prevention combined baffle;

[0008] A flood prevention combined baffle comprises at least three connected baffles, wherein a rotating pair and a limiting guide structure are provided between the connected baffles, so that adjacent baffles can be rotated from being perpendicular to each other to being in contact with each other, and the baffles connected in sequence are rotated and folded into a Z shape and rotated to be in contact with each other. When the connected baffles are rotated to a mutually perpendicular state, the baffles are connected in steps and extend in the vertical and horizontal directions one by one.

[0009] A technical solution provided by this application also has the following technical features:

[0010] Preferably, when adjacent baffles are perpendicular to each other, the end faces are tightly fitted together, that is, the end faces of adjacent baffles are fitted together, and the end face angles of the end faces of adjacent baffles are complementary angles, which are the angles between the end of the baffle and the plate surface.

[0011] Preferably, the revolving pair comprises a pin and a hole.

[0012] Preferably, the limiting guide structure includes a tenon and a mortise, and the tenon and the mortise are respectively arranged on adjacent baffles, and the tenon and the mortise are used to connect the baffles end to end.

[0013] Preferably, the baffle includes a lower vertical plate, a middle flat plate, and an upper vertical plate.

[0014] Preferably, the lower vertical plate is placed below the top of the front wall of the flood control wall, the middle flat plate is placed flat on the top of the flood control wall, and the upper vertical plate is placed above the top of the rear wall of the flood control wall;

[0015] The two ends of the lower vertical plate, the middle flat plate and the upper vertical plate baffle are at 45° to the plate surface. The adjacent end heads are respectively provided with tenons and mortises, and the end heads are provided with connecting devices and ball buckles. After being connected by the connecting device, the adjacent baffles can be rotated along their axis. After the tenons are completely entered into the mortises, the adjacent baffles are perpendicular to each other, and the connecting devices and ball buckles are locked. The three baffles are connected to form a group.

[0016] Preferably, the sides of the lower vertical plate, the middle flat plate and the upper vertical plate are respectively provided with card plates and card slots for assembly, and after the plate slots of multiple groups of baffles are spliced ​​together, they are used as flood prevention baffles on the top of the flood prevention wall.

[0017] Preferably, the two ends of the lower vertical plate, the middle flat plate and the upper vertical plate baffle are at 45° to the plate surface, and are respectively provided with tenons and mortises. After anchoring, the baffles are in a swastika shape with two of them perpendicular to each other. The connected tenons and mortises are used to provide resistance. The baffles fit tightly against each other under the action of water pressure to prevent water leakage.

[0018] Preferably, connecting devices and ball buckles are provided at the joints on both sides of the two end ends of the lower vertical plate, the middle flat plate and the upper vertical plate baffle. The connecting device is the rotation axis when the baffle is assembled and rotated, which is used to avoid the tenon and mortise from getting stuck. The ball buckle is locked when the adjacent baffles are completely vertical to prevent the upper vertical plate from tipping over.

[0019] Preferably, clamping plates and clamping grooves are respectively provided on both sides of the lower vertical plate, the middle flat plate and the upper vertical plate, so as to tightly connect the baffles horizontally and prevent water leakage.

[0020] Preferably, the lower vertical plate is arranged below the front of the flood control wall, and is in contact with the side of the flood control wall to withstand the horizontal thrust, and is used to limit the horizontal backward movement of the baffle;

[0021] The middle plate is placed flat on the top of the flood control wall to resist the water pressure and wave pressure acting on the upper plate by the deadweight of the water above it. The upper plate is used to prevent the water in front of the wall from entering the protected area behind the wall.

[0022] Preferably, the baffle is a hollow structure.

[0023] A method for using a combined flood control baffle, wherein the baffle is connected by a bead buckle, and the baffle is rotated, folded, or rotated to a vertical position and then locked to enter a use state;

[0024] When disassembly is required, first press the devices on both sides of the bumper buckle to release the locking state, fold the baffle and store it, pull the bumper buckle along the direction of the tenon to disassemble the baffle assembly.

[0025] A method for installing a combined flood control baffle, wherein the mortises at the ends of the lower vertical plate, the middle flat plate and the upper vertical plate and the tenons are transition fit or clearance fit, the tenons and the mortises are concentric arcs with the ball buckle of the connecting device as the center of the circle; when the tenons are rotated and pulled out of the mortises, adjacent baffles overlap; when the tenons are rotated and inserted into the mortises, the baffles are unfolded and the adjacent baffles are perpendicular, and the end plate surfaces of the baffles fit together.

[0026] The present invention has the following beneficial effects:

[0027] 1. The combined flood control baffle structure of the present invention can meet the safety requirements of temporary heightening and flood control at the top of a flood control wall or any flat embankment structure with a vertical water surface;

[0028] 2. The flood control combined baffle structure of the present invention can be made into standard components, and each baffle is interchangeable. Its unique swastika-shaped structure design enables the baffle structure to remain stable when the water surface is below the top of the upper plate;

[0029] 3. Compared with the traditional flood control combined baffle structure, the flood control combined baffle structure of the present invention has the characteristics of small cross-section, simple structure, easy installation and disassembly, and convenient storage and transportation, which improves the flood control response speed and reduces the flood control cost;

[0030] In general, the present invention can meet the safety requirements of temporarily raising flood control and water retaining at the top of a flood control wall or any flat embankment structure with a vertical water surface. At the same time, its unique shape design enables the baffle structure to remain stable when the water surface is below the top of the upper vertical plate. In addition, due to its small structural cross-section, simple structure, easy installation and disassembly, and conducive to storage and transportation, it improves the flood control response speed and reduces the flood control cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a cross-sectional view of a combined flood control baffle according to the present invention;

[0032] FIG2 is an assembly diagram of a flood control combined baffle according to the present invention;

[0033] FIG3 is an elevation view of both sides of the top of a combined flood control baffle of the present invention;

[0034] In the figure: 1, lower vertical plate 2, middle flat plate 3, upper vertical plate 4, connecting device 5, tenon 6, mortise 7, flood control wall 8, clamping plate 9, clamping groove. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0039] As shown in Figure 1-3, a flood prevention combined baffle includes at least three connected baffles. A rotating pair and a limiting guide structure are provided between the connected baffles, so that the adjacent baffles can be rotated from perpendicular to each other to fit together, and the baffles connected in sequence are rotated and folded into a Z shape and rotated to fit together. When the connected baffles are rotated to a perpendicular state, the baffles are connected in steps and extend in the vertical and horizontal directions one by one.

[0040] When implemented, the present application has the following characteristics: the flood control combined baffle structure of the present invention can meet the requirements of temporary flood control and water retention, ensuring flood control safety. Due to its simple structure and convenient installation and disassembly, it can significantly shorten the installation period of the flood control combined baffle for temporary heightening of flood control walls during flood seasons in a large area. At the same time, the flood control combined baffle has good stability and can be reused multiple times, making it easy to store and transport. The present invention effectively overcomes various shortcomings of the existing technology and has high industrial utilization value.

[0041] Specifically, when adjacent baffles are perpendicular to each other, the two end faces are tightly fitted together, that is, the end faces of adjacent baffles are fitted together, and the end face angles of the end faces of adjacent baffles are complementary angles. The end face angle is the angle between the end of the baffle and the board surface. They are connected to each other, vertical when unfolded, and fit together and stacked after folding.

[0042] Specifically, the rotary pair includes a pin and a hole to meet the needs of rotation and locking.

[0043] Specifically, the limiting guide structure includes a tenon 5 and a mortise 6, which are respectively arranged on adjacent baffles. The tenon 5 and the mortise 6 are used to connect the baffles end to end, and the tenon 5 and the mortise 6 are used to achieve guide limiting.

[0044] Specifically, the baffle includes a lower vertical plate 1 , a middle flat plate 2 , and an upper vertical plate 3 .

[0045] Specifically, the lower vertical plate 1 is placed below the top of the front wall of the flood control wall 7, the middle flat plate 2 is placed flat on the top of the flood control wall 7, and the upper vertical plate 3 is placed above the top of the rear wall of the flood control wall 7;

[0046] The two ends of the baffles of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 are at 45° to the plate surface, and the adjacent end heads are respectively provided with tenons 5 and mortises 6. The end heads are provided with connecting devices 4 and bumper buckles. After being connected by the connecting device 4, the adjacent baffles can be rotated along their axis. After the tenon 5 completely enters the mortise 6, the adjacent baffles are perpendicular to each other, the connecting device 4 and the bumper buckle are locked, and the three baffles are connected to form a group.

[0047] Specifically, the sides of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 are respectively provided with a card plate 8 and a card slot 9 for assembly. After the plate slots of multiple groups of baffles are spliced ​​together, they are used as flood prevention baffles on the top of the flood prevention wall 7.

[0048] Specifically, the two ends of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 baffles are at 45 degrees to the plate surface, and are respectively provided with tenons 5 and mortises 6. After anchoring, the baffles are in a swastika shape with two of them perpendicular to each other. The connected tenons 5 and mortises 6 are used to provide resistance. The baffles fit tightly against each other under the action of water pressure to prevent water leakage.

[0049] Specifically, connecting devices 4 and ball buckles are provided at the joints on both sides of the two end heads of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3. The connecting device 4 is the rotation axis when the baffle is assembled and rotated, which is used to avoid the tenon and mortise from getting stuck. When the adjacent baffles are completely vertical, the ball buckle is locked to prevent the upper vertical plate 3 from tipping over.

[0050] Specifically, clamping plates 8 and clamping grooves 9 are respectively provided on both sides of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3, so as to tightly connect the baffles horizontally and prevent water leakage.

[0051] Specifically, the lower vertical plate 1 is arranged below the front of the flood control wall 7, and is in contact with the side of the flood control wall 7 to withstand the horizontal thrust, and is used to limit the horizontal backward movement of the baffle;

[0052] The middle plate 2 is placed flat on the top of the flood control wall 7 to resist the water pressure and wave pressure acting on the upper plate 3 by the deadweight of the water above it. The upper plate 3 is used to prevent the water in front of the wall from entering the protected area behind the wall.

[0053] Specifically, the baffle is a hollow structure.

[0054] Specifically, a method for using a combined flood control baffle is provided, wherein the baffle is connected by a bead buckle, and the baffle is rotated and folded for storage or rotated to a vertical position and then locked to enter a use state;

[0055] When disassembly is required, first press the devices on both sides of the bumper buckle to release the locking state, fold the baffle and store it, pull the bumper buckle along the direction of the tenon 5 to disassemble the baffle assembly.

[0056] A method for installing a flood-prevention combined baffle, wherein the mortises 6 at the ends of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 and the tenons 5 are transition fits or clearance fits, the tenons 5 and the mortises 6 are concentric arcs with the ball buckle of the connecting device 4 as the center of the circle; when the tenon 5 is rotated and pulled out in the mortise 6, the adjacent baffles overlap, and after the tenon 5 is rotated and inserted into the mortise 6, the baffles are unfolded and the adjacent baffles are perpendicular, and the end plate surfaces of the baffles are in contact.

[0057] Specifically, the lower vertical plate 1 placed below the top of the front wall of the flood control wall 7 and the middle flat plate 2 placed flat on the top of the flood control wall 7 and the upper vertical plate 3 standing above the top of the rear wall of the flood control wall 7, the two ends of each baffle of the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 are 45 degrees to the board surface, and the two ends of the baffle are provided with a tenon 5 and a mortise 6, which are connected to form a group through the connecting device 4 on both sides of the end. After unfolding, the tenon 5 is completely inserted into the mortise 6 and enters the working state vertically in pairs. The connecting device is locked to form a swastika shape perpendicular to each other.

[0058] The sides of both sides of the baffle are respectively provided with a card plate 8 and a card slot 9 for assembling. After the plate slots of multiple groups of baffles are spliced ​​together, they together form a flood prevention baffle that can be placed on the top of the flood prevention wall.

[0059] The lower vertical plate 1 is located below the front of the flood control wall and is in contact with the flood control wall to withstand horizontal thrust, preventing the baffle from moving horizontally backward; the middle flat plate 2 is placed flat on the top of the flood control wall 7. The deadweight of the water acting on its upper part resists the water pressure and wave pressure acting on the upper vertical plate 3, preventing the baffle from overturning; the upper vertical plate 3 is used to prevent the water in front of the wall from entering the protected area behind the wall.

[0060] The three baffles are connected to form a group, which can be directly folded for storage; the tenon 5 and the mortise 6 allow the tenon 5 to rotate in the mortise 6 with the ball buckle as the center, so that the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 can be folded when stored. When unfolded, the end surfaces of the two baffles overlap after being connected at a right angle, and the tenon and mortise provide resistance to achieve a stable use state;

[0061] The tenon 5 and the mortise 6 are concentric arcs with the ball buckle of the connecting device 4 as the center;

[0062] Alternatively, the tenon 5 and the mortise 6 are concentric elliptical arcs, with the ball buckle of the connecting device 4 as the center;

[0063] The tenon 5 rotates in the mortise 6, and the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate 3 can be folded when stored. When unfolded, the end surfaces of the two baffles are overlapped after being connected at a right angle, and the use state is achieved;

[0064] During connection and assembly, first, stack the tenons and mortises of a group of lower vertical plates 1, middle flat plates 2 and upper vertical plates 3 corresponding to each other, insert the tenons into the mortises, and use force to fasten the beads to complete the connection. Rotate the lower vertical plate 1 and the upper vertical plate 3 so that the tenons 5 enter the mortises 6 and are vertically connected to the middle flat plate 2 to complete the combined assembly of a group of baffles; place the combined baffles of the first group on the top of the flood control wall; combine and assemble the combined baffles of the second group; place the combined baffles of the second group on the left or right side of the first group of baffles on the top of the flood control wall and connect them to the front combined baffles through the card plate and the card slot; continue to assemble the combined baffles and the top of the flood control wall in the left and right directions until a complete flood control structure is formed.

[0065] Specifically, the combined baffle, through its combined form, has a lower vertical plate 1 in front of the flood control wall 7 and fits with it to withstand horizontal thrust, preventing the baffle from moving backward horizontally; the middle flat plate 2 is placed flat on the top of the flood control wall 7, and the deadweight of the water acting on it resists the water pressure and wave pressure acting on the upper vertical plate, preventing the baffle from overturning; the upper vertical plate blocks the water in front of the wall from entering the protected area behind the wall; the lower vertical plate 1, the middle flat plate 2 and the upper vertical plate are all at 45 degrees to the plate surface, and are respectively provided with tenons 5 and mortises 6. When the baffle is unfolded, the baffle can be in a swastika shape that is perpendicular to each other. The connected tenons 5 and mortises 6 provide resistance, and the end faces fit tightly against each other under the action of water pressure;

[0066] The first cross-section of the mortise 6 is slightly larger than the second cross-section of the tenon 5. The tenon 5 and the mortise 6 are designed to be in the form of concentric arcs connected to a semi-ellipse with the ball buckle of the connecting device 4 as the center. The tenon 5 can rotate in the mortise 6. When stored, the lower vertical plate 11, the middle flat plate 2 and the upper vertical plate can overlap. When unfolded, the end surfaces of the two baffles overlap after forming a right angle, achieving a stable use state. The installation includes the following steps:

[0067] S1. Stack the tenons 5 and mortises 6 of a set of lower vertical plates 1, middle plate 2 and upper vertical plates corresponding to each other. Insert the tenons 5 into the mortises 6 and use force to snap the beads to complete the connection. Rotate the lower vertical plates 1 and upper vertical plates so that the tenons 5 are fully inserted into the mortises 6 and then connect them to the middle plate 2 at 90 degrees. Lock with the buckle to complete the assembly of a set of baffles.

[0068] S2, placing the combined baffles of the first group on top of the flood control wall 7;

[0069] S3, assembling the second set of lower vertical plate 1, middle flat plate 2 and upper vertical plate;

[0070] S4, placing the second group of combined baffles on the left or right side of the first group of baffles on the top of the flood control wall 7 and connecting them to the front combined baffles through the clamping plate 8 and the clamping slot 9;

[0071] S5. Continue to assemble the combined baffles and the top of the flood control wall 7 in the left and right directions until a complete flood control structure is formed.

[0072] Specifically, both ends of the baffle are at 45 degrees to the board surface, and are connected at right angles and fit tightly after being anchored by mortise and tenon.

[0073] Specifically, in step S1 , the tenon 5 and the mortise 6 can be connected and disassembled only when the two baffles are stacked together.

[0074] Specifically, in step S1, the tenons 5 of any two baffles can be completely inserted into the mortise 6 to complete the assembly by directly rotating them after being connected through the ball buckle.

[0075] Specifically, in step S1 , the lower vertical plate 1 , the middle flat plate 2 and the upper vertical plate can be interchanged during assembly, and the directions of the lower vertical plate 1 and the upper vertical plate can be reversed after assembly.

[0076] In general, the present invention can meet the safety requirements of temporarily raising flood control and water retaining at the top of a flood control wall or any flat embankment structure with a vertical water surface. At the same time, its unique shape design enables the baffle structure to maintain a stable state when the water surface is below the top of the upper vertical plate. In addition, due to the small structural cross-section, simple structure, easy installation and disassembly, and conducive storage and transportation, the flood control response speed is improved and the flood control cost is reduced.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A flood control combined baffle, characterized in that: The invention comprises three connected baffles. When adjacent baffles are perpendicular to each other, the two end surfaces are tightly fitted, that is, the end surfaces of adjacent baffles are fitted; the baffle comprises a lower vertical plate (1), a middle flat plate (2), and an upper vertical plate (3); the lower vertical plate (1) is placed below the top of the front wall of the flood control wall (7), the middle flat plate (2) is placed flat on the top of the flood control wall (7), and the upper vertical plate (3) is placed above the top of the rear wall of the flood control wall (7); the two end heads of the lower vertical plate (1), the middle flat plate (2) and the upper vertical plate (3) are at 45 degrees to the plate surface, and the adjacent end heads are respectively provided with tenons (5) and mortises (6), and the end heads are provided with connecting devices (4) and the ball buckle, after being connected by the connecting device (4), the adjacent baffles rotate along their axis, and after the tenon (5) is completely inserted into the mortise (6), the adjacent baffles are perpendicular to each other, and the connecting device (4) and the ball buckle are locked, and the three baffles are connected to form a group; the lower vertical plate (1), the middle flat plate (2) and the upper vertical plate (3) are respectively provided with a clamping plate (8) and a clamping groove (9) on both sides, which are used for horizontally tightly connecting the baffles and preventing water leakage; the lower vertical plate (1) is arranged at the lower front part of the flood control wall (7), and is in contact with the side of the flood control wall (7) to withstand horizontal thrust, and is used to limit the horizontal backward movement of the baffle; The middle plate (2) is placed flat on the top of the flood control wall (7) to resist the water pressure and wave pressure acting on the upper plate (3) by the deadweight of the water body above it. The upper plate (3) is used to prevent the water body in front of the wall from entering the protected area behind the wall. The three baffles are connected to form a group, which can be directly folded and stored; the tenon (5) and the mortise (6) enable the tenon (5) to rotate in the mortise (6) with the ball buckle as the center, so that the lower vertical plate (1), the middle flat plate (2) and the upper vertical plate (3) are folded when stored, and the end surfaces of the two baffles overlap after being connected at a right angle when unfolded, and the tenon and the mortise provide resistance to achieve a stable use state; the tenon (5) and the mortise (6) are concentric arcs with the ball buckle of the connecting device (4) as the center.

2. A method for using a combined flood-proof baffle, using the combined flood-proof baffle according to claim 1, characterized in that: The baffle is connected by a ball-bump buckle. The baffle can be rotated and folded for storage or rotated to a vertical position and locked for use. When disassembly is required, first press the devices on both sides of the ball buckle to release the locking state, fold the baffle plate and store it, and pull the ball buckle open along the direction of the tenon (5) to disassemble the baffle plate assembly.

3. A method for installing a flood-proof combined baffle, using the flood-proof combined baffle according to claim 1, characterized in that: The mortises (6) at the ends of the lower vertical plate (1), the middle flat plate (2) and the upper vertical plate (3) and the tenons (5) are in transitional fit or clearance fit. When the tenons (5) are rotated and pulled out of the mortises (6), the adjacent baffles overlap. When the tenons (5) are rotated and inserted into the mortises (6), the baffles are unfolded.

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