A convenient extended steel structure factory building and a construction process thereof

Abstract

The application relates to an extended steel structure factory convenient to expand and a construction process thereof. The steel structure factory comprises a beam frame structure, a roof arranged above the beam frame structure, and end face walls respectively arranged at two ends of the beam frame structure. Connecting mechanisms for connecting the end face walls and the beam frame structure are arranged between the end face walls and the beam frame structure. The connecting mechanisms comprise a plurality of guide frames fixed on the beam frame structure and sliding members fixed on the end face walls. The guide frames are in sliding connection with the sliding members, the guide frames are arranged through the end face walls, and one end of each guide frame away from the beam frame structure is used for arranging an extension frame. The sliding members are used for sliding along the guide frames and the extension frames. The end face walls are separated from the beam frame structure, then new beam frame structures are connected at the ends of the beam frame structure, then the extension frames aligned with the guide frames are installed on the new beam frame structures, and then the end face walls are moved along the extension frames to the ends of the new beam frame structures. In the expansion process, the end face walls no longer need to be removed, so that the expansion of the factory is more convenient.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steel structure workshops, in particular to a steel structure workshop convenient to extend and a construction process thereof. BACKGROUND

[0002] Most steel structure workshops adopt fixed structure design, and the overall size is fixed after assembly. When the area of the steel structure workshop needs to be expanded due to production, one end of the workshop needs to be removed, and then the extension is performed at the removed position, so as to expand the area of the steel structure workshop, but after the end of the steel structure workshop is removed and expanded, reinstallation is needed, which is troublesome.

[0003] A steel structure workshop convenient to extend is disclosed in Chinese Patent No. CN202222111628.1, which belongs to the technical field of steel structure workshops and comprises a steel structure workshop body, two expansion covers are slidably connected to the steel structure workshop body, and an adjusting structure, a fixing structure, a driving structure and an expansion structure are arranged on the expansion cover. The adjusting structure comprises a threaded rod, and the threaded rod is rotatably connected to the expansion cover.

[0004] In the above scheme, the overall size of the workshop is expanded, so that the overall spacing between the steel columns for support in the workshop is expanded, which affects the stability of the workshop.

[0005] Therefore, a new technical scheme is needed to solve the above problems. SUMMARY

[0006] In order to expand the steel structure workshop without removing the end wall and without affecting the strength of the steel structure workshop, the application provides a steel structure workshop convenient to extend and a construction process thereof.

[0007] The steel structure workshop convenient to extend provided by the application adopts the following technical scheme:

[0008] The steel structure workshop convenient to extend comprises a beam frame structure, a roof arranged above the beam frame structure and end walls arranged at two ends of the beam frame structure, a connecting mechanism connecting the end walls and the beam frame structure is arranged between the end walls and the beam frame structure, the connecting mechanism comprises a plurality of guide frames fixed to the beam frame structure and a sliding piece fixed to the end wall, the guide frames are slidably connected to the sliding piece, the guide frames penetrate the end wall, and an extension frame is arranged at the end of the guide frame away from the beam frame structure, and the sliding piece is used for sliding along the guide frame and the extension frame.

[0009] By adopting the technical scheme, when the factory building needs to be expanded, the end face wall is separated from the beam frame structure, then a new beam frame structure is connected at the end of the beam frame structure, then an extension frame aligned with the guide frame is installed on the new beam frame structure, then the end face wall is moved to the end of the new beam frame structure along the extension frame, then the end face wall is fixed with the new beam frame structure, and the expansion of the factory building is completed, so that the end face wall does not need to be removed during the expansion, and the expansion of the factory building is more convenient.

[0010] Optionally, the guide frame is provided with a limiting mechanism for limiting the movement of the sliding piece, the limiting mechanism is arranged on both sides of the sliding piece for abutting against the sliding piece, the limiting mechanism comprises a limiting seat fixed on the guide frame, a limiting block rotatably connected to the limiting seat, and a limiting elastic piece for moving one end of the limiting block away from the limiting seat in a direction away from the limiting seat, one end of the limiting block close to the sliding piece is inclined away from the limiting seat, and the limiting seat is further provided with a limiting groove, and the other end of the limiting block away from the sliding piece abuts in the limiting groove.

[0011] By adopting the technical scheme, when the sliding piece on the end face wall moves between the two limiting mechanisms, the position of the sliding piece on the guide frame is limited, so that the position of the end face wall remains stable. During the movement of the end face wall, the stopping position of the sliding mechanism can also be automatically limited by the limiting mechanism, so that the sliding piece does not directly separate from the guide frame, and the movement of the end face wall remains more secure and stable, which is also safer during the expansion of the factory building.

[0012] Optionally, the side wall of the limiting block is rotatably connected with an abutting block, the rotation position of the abutting block is on the side of the rotation axis of the limiting block away from the sliding piece, and the abutting block is used for abutting against the position of the bottom of the limiting groove close to the sliding piece.

[0013] By adopting the technical scheme, when the end face wall needs to be moved, the limiting block in the moving direction of the sliding piece needs to be rotated to be parallel to the moving direction of the sliding piece, the position of the limiting block needs to be limited after the limiting block is rotated, and the abutting block is rotated to abut against the limiting groove after the limiting block is rotated to be parallel to the moving direction of the sliding piece. The position of the abutting block remains limited when it abuts against the bottom of the limiting groove, so that the position of the limiting block is limited correspondingly, the limiting block can remain parallel to the moving direction of the sliding piece, the sliding piece can remain normal, and the movement of the end face wall remains stable.

[0014] Optionally, a gap hole is formed in the upper end surface of the limiting block, and the gap hole is arranged on the side of the rotation axis of the limiting block away from the sliding piece.

[0015] By adopting the above technical solution, after rotating the limiting block to be parallel to the moving direction of the sliding member, the abutting block is rotated towards the limiting groove at a certain angle. Then, a finger is inserted into the clearance hole to apply a force towards the bottom of the limiting groove to the abutting block, so that the abutting block can be rotated to the state of abutting against the bottom of the limiting groove. During the rotation of the abutting block, it is not necessary to insert a finger into the gap between the limiting groove and the limiting block, thus making the rotation of the abutting block more convenient.

[0016] Optionally: The end face wall has several mounting grooves running through it, the sliding member is disposed in the mounting groove, the side wall of the end face wall abuts against the beam frame structure, and several cover plates that close the side wall of the mounting groove away from the beam frame structure can also be detachably connected to the end face wall.

[0017] By adopting the above technical solution, after the end wall is moved into place and connected and fixed to the beam frame structure, the opening of the installation groove is sealed with a cover plate, so that rainwater from the outside will not flow directly into the inner cavity of the beam frame structure through the installation groove, making it difficult for rainwater from the outside to directly affect the interior of the factory. Furthermore, when it is necessary to expand the factory, the cover plate can be removed directly to allow the guide frame and the extension frame to be connected, making the subsequent expansion process of the factory more convenient.

[0018] Optionally: A retaining edge is provided along the edge of the end of the beam frame structure near the end wall, the retaining edge extends toward the end wall, and the retaining edge is provided on the side of the end wall away from the inner cavity of the beam frame structure.

[0019] By adopting the above technical solution, the connection between the end wall and the beam frame structure is shielded by the retaining edge. In rainy or snowy weather, rainwater is less likely to move directly towards the connection between the end wall and the beam frame structure, thus preventing rainwater from affecting the interior of the factory building.

[0020] Optionally: Each end face of the end wall away from the inner cavity of the beam frame structure is provided with an extension strip perpendicular to the end face wall, the extension strip is provided close to the beam frame structure, and the extension strip is provided on the side of the retaining edge close to the inner cavity of the beam frame structure.

[0021] By adopting the above technical solution, during the process of rainwater adhering to the end wall and flowing down the end wall, the direction of rainwater movement is controlled by computer using the extension strip, so that the rainwater does not extend to the end wall but flows between the end wall and the beam structure, thus making it more difficult for rainwater to enter the factory building and making the factory building less susceptible to the impact of rainwater.

[0022] Optionally: The cover plate is provided with a water-blocking strip parallel to the extension strip, and the cover plate and the water-blocking strip are both provided with sealing strips on the side walls near the end face wall.

[0023] By adopting the above technical solution, the gap between the cover plate and the end wall, and the gap between the water-blocking strip and the extension strip are sealed by the sealing strip, so that rainwater is not easy to flow into the factory building from the gap between the cover plates, and the factory building is not easily affected by rainwater.

[0024] A construction process for an extended steel structure factory building, characterized by the following steps:

[0025] S1. Remove the retaining edge and cover plate, connect the new beam frame structure to the end of the beam frame structure that needs to be extended, and install the beam frame structure into shape.

[0026] S2. Provide several extension frames and several guide frames, install the extension frames in the new beam frame structure and align and fix the extension frames with the guide frames on the old beam frame structure, and install the guide frames at the end of the guide frames away from the old beam frame structure and align and fix them.

[0027] S3. Remove the bolts on the end wall and the old beam frame structure, rotate the end of the limiting block near the guide frame that is close to the sliding part to be parallel to the limiting seat, and rotate the abutting block to abut against the limiting groove.

[0028] S4. Push the end wall along the extension frame toward the interior of the new beam frame structure until it is close to the guide frame, and stop when the sliding part abuts against the limit block on the new beam frame structure. Fix the moved and stopped end wall to the new beam frame structure with bolts, and remove the extension frame and the guide frame on the old beam frame structure.

[0029] S5. Lay the new roof on the new beam frame structure and connect it with the old roof. Install the edging and cover plates to the new beam frame structure and end walls.

[0030] By adopting the above technical solution, a new beam frame structure can be directly connected to the location where the old beam frame structure needs to be expanded. After the new beam frame structure is installed, the end wall is moved to the end of the new beam frame structure and connected to it. Thus, the end wall no longer needs to be demolished during the expansion process, making the expansion of the factory building more convenient.

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

[0032] 1. By setting up end walls that slide relative to the beam frame structure, when expansion is needed, after the new beam frame structure is installed, the end walls can be moved to the end of the new beam frame structure. This eliminates the need to dismantle and reinstall the end walls during expansion, making the expansion of the factory building more convenient.

[0033] 2. By setting a limiting mechanism to restrict the movement of the sliding component, the position of the sliding component can be automatically limited when it moves to the position of the guide frame, so that the end wall will not fall directly off the guide frame during the movement process, and the movement process of the end wall remains stable. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0035] Figure 2 This is a schematic diagram illustrating the connection position between the end wall and the beam frame structure, as shown in an embodiment of this application.

[0036] Figure 3 for Figure 2 Enlarged view of part A;

[0037] Figure 4 This is a schematic diagram illustrating the location of the connecting mechanism in an embodiment of this application;

[0038] Figure 5 for Figure 4 Enlarged view of part B.

[0039] In the diagram, 1 is the beam frame structure; 11 is the roof; 12 is the retaining edge; 2 is the end wall; 21 is the mounting groove; 22 is the cover plate; 23 is the extension strip; 24 is the water-blocking strip; 3 is the connecting mechanism; 31 is the guide frame; 311 is the recessed groove; 32 is the sliding component; 33 is the extension frame; 4 is the limiting mechanism; 41 is the limiting seat; 411 is the receiving groove; 412 is the limiting groove; 42 is the limiting block; 421 is the clearance hole; 43 is the limiting elastic component; and 44 is the abutment block. Detailed Implementation

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] This application discloses a type of easily extendable steel structure factory building, such as... Figure 1 As shown, the structure includes a beam frame structure 1, a roof 11 disposed above the beam frame structure 1, and end walls 2 respectively disposed at both ends of the beam frame structure 1 and fixed with bolts. A connecting mechanism 3 is provided between the end walls 2 and the beam frame structure 1 to connect the two. Figure 2 and Figure 3 As shown, the connecting mechanism 3 includes several guide frames 31 bolted to the beam frame structure 1 and several sliding members 32 bolted to the end wall 2. The sliding members 32 are respectively connected to the guide frames 31 and slide along the guide frames 31. Several mounting grooves 21 penetrate the end wall 2, passing through its sidewalls. The sliding members 32 are all bolted into the mounting grooves 21. The guide frames 31 pass through the mounting grooves 21, with a gap between the guide frames 31 and the mounting grooves 21. Figure 1As shown, the end of the guide frame 31 furthest from the beam frame structure 1 can be connected to several horizontally arranged extension frames 33. The sliding member 32 can move from the guide frame 31 to the extension frame 33 and move along the extension frame 33. Several rollers are rotatably connected to the sliding member 32, and the rollers are embedded in the guide frame 31 and roll along the guide frame 31. When it is necessary to expand the factory building, the new beam frame structure 1 is installed on the old beam frame structure 1, and the extension frame 33 is connected to the new beam frame structure 1 and aligned with the guide frame 31. Then, the end wall 2 is moved along the extension frame 33 to the end of the new beam frame structure 1, so that it is no longer necessary to dismantle the end wall 2. Only the new beam frame structure 1 needs to be reconstructed to realize the expansion of the factory building.

[0042] like Figure 4 and Figure 5 As shown, when moving the end wall 2, it is necessary to prevent the end wall 2 from moving excessively and falling off the rear guide frame 31. Therefore, the guide frame 31 is also provided with a limiting mechanism 4 to limit the movement of the sliding member 32. The limiting mechanism 4 is respectively provided on both sides of the sliding member 32. The limiting mechanism 4 includes a limiting seat 41 fixed on the guide frame 31, a limiting block 42 rotatably connected to the limiting seat 41, and a limiting elastic member 43 that pushes the end of the limiting block 42 near the sliding member 32 to rotate in a direction away from the limiting seat 41. The guide frame 31 has a recessed groove 311. The limiting seat 41 is fixed in the recessed groove 311 with bolts, and the side wall of the limiting seat 41 away from the recessed groove 311 is flush with the side wall of the guide frame 31 where the recessed groove 311 is provided. The limiting seat 41 has a receiving groove 411, and a limiting groove 412 is also formed on the bottom surface of the receiving groove 411 away from the sliding member 32. The limiting block 42 is rotatably connected in the receiving groove 411. When the limiting block 42 is parallel to the limiting seat 41, the limiting block 42 is completely submerged in the receiving groove 411. When the end of the limiting block 42 near the sliding member 32 rotates away from the limiting seat 41, the end of the limiting block 42 away from the sliding member 32 abuts against the limiting groove 412. In this embodiment, the limiting elastic member 43 is a torsion spring. The axis of the torsion spring coincides with the axis of the limiting block 42. One end of the torsion spring abuts against the limiting block 42, and the other end of the torsion spring abuts against the limiting seat 41. By using the abutment between the limiting block 42 and the sliding member 32, the movement of the sliding member 32 is restricted, thereby making the movement of the end wall 2 more stable.

[0043] Since it is necessary to push the slider 32 to move, the limiting block 42 located on the moving path of the slider 32 also needs to be sunk into the receiving groove 411, the two side walls of the limiting block 42 perpendicular to its rotation axis are rotatably connected to the abutment block 44. The rotation axis of the abutment block 44 and the limiting block 42 is set on the side of the rotation axis of the limiting block 42 and the limiting seat 41 away from the slider 32. When the limiting block 42 is completely sunk into the receiving groove 411, the abutment block 44 can rotate downward and abut against the bottom surface of the limiting groove 412 near the slider 32. Thus, the position of the limiting block 42 is limited by the abutment block 44, so that the abutment block 44 is in the state of being sunk into the receiving groove 411. When the slider 32 moves, it is no longer necessary to manually limit the position of the limiting block 42, making the movement process of the slider 32 more convenient.

[0044] To make it easier for the abutting block 44 to rotate downwards, a clearance hole 421 is provided through the upper end of the limiting block 42. The clearance hole 421 is located on the side of the rotation axis of the limiting block 42 and the limiting seat 41 away from the sliding member 32. After the limiting block 42 is rotated into the receiving groove 411, the hand is inserted into the clearance hole 421 to apply force to the abutting block 44, rotating the abutting block 44 to abut against the limiting groove 412. This eliminates the need to apply force to the abutting block 44 from the gap between the limiting block 42 and the receiving groove 411, making the rotation process of the abutting block 44 more convenient.

[0045] like Figure 3 As shown, after the end wall 2 is installed, the mounting groove 21 directly connects the two ends of the end wall 2, which can easily lead to rainwater entering. Therefore, several cover plates 22 that can close the mounting groove 21 are also connected to the end wall 2. The cover plates 22 are set on the side of the end wall 2 away from the beam frame structure 1. After the end wall 2 is moved into place, the cover plates 22 are set at the mounting groove 21 and cover the mounting groove 21. Then, bolts are used to pass through the cover plates 22 and threadedly connect them to the guide frame 31, so that the cover plates 22 close the opening of the mounting groove 21, making it difficult for rainwater and other substances to enter the inner cavity of the beam frame structure 1 through the mounting groove 21.

[0046] Because the end wall 2 is slidably positioned relative to the beam frame structure 1, a gap may form between the end wall 2 and the beam frame structure 1, allowing rainwater to flow in. Therefore, the edges of the beam frame structure 1 near the end wall 2 are bolted with retaining flanges 12 parallel to the end wall 2. The retaining flanges 12 extend towards the end wall 2 and are located on the side of the end wall 2 away from the inner cavity of the beam frame structure 1, with a gap between the retaining flanges 12 and the end wall 2. The retaining flanges 12 prevent rainwater from moving directly towards the connection between the end wall 2 and the beam frame structure 1, making it difficult for rainwater to flow from the connection between the end wall 2 and the beam frame structure 1 into the beam frame structure 1.

[0047] As rainwater flows downwards along the end wall 2, it also moves to the connection between the end wall 2 and the beam frame structure 1 and seeps into the inner cavity of the beam frame structure 1. Therefore, an extension strip 23 perpendicular to the end wall 2 is bolted to the edge of the end face of the end wall 2 away from the inner cavity of the beam frame structure 1. The extension strip 23 is located close to the inner wall of the beam frame structure 1 and is located on the side of the retaining edge 12 closest to the end wall 2. A water-blocking strip 24 is bolted to the end face of the cover plate 22 away from the end wall 2. The water-blocking strip 24 is perpendicular to the end wall 2 and can be spliced ​​with the extension strip 23 to maintain a flush connection. Sealing strips are provided on the side walls of the cover plate 22 and the water-blocking strip 24 near the end wall 2. The sealing strips abut against the end wall 2 and the extension strip 23, thereby further reducing the gap at the connection and reducing rainwater leakage. As rainwater flows downward along the end wall 2, the water-blocking strip 24 and the extension strip 23 guide the flow direction of the rainwater, making it difficult for rainwater to flow into the beam frame structure 1 from the gap between the end wall 2 and the beam frame structure 1.

[0048] A construction process for an extended steel structure factory building includes the following steps:

[0049] S1. Remove both the retaining flange 12 and the cover plate 22, connect a new beam frame structure 1 for expansion to the end of the beam frame structure 1 that needs to be expanded, and install the beam frame structure 1 into shape. The new beam frame structure 1 is connected and fixed to the old beam frame structure 1.

[0050] S2. Provide several extension frames 33 and several guide frames 31, install both extension frames 33 and guide frames 31 in the new beam frame structure 1 and align and fix the extension frames 33 with the guide frames 31 on the old beam frame structure 1, and install the guide frames 31 on the end of the newly installed guide frames 31 away from the old beam frame structure 1 and align and fix them.

[0051] S3. Remove the bolts on the end wall 2 and the old beam frame structure 1, rotate the end of the limiting block 42 near the guide frame 31 that is close to the sliding part 32 to be parallel to the limiting seat 41, and rotate the abutting block 44 to abut against the limiting groove 412.

[0052] S4. Push the end wall 2 along the extension frame 33 toward the interior of the new beam frame structure 1 until it is close to the guide frame 31, and stop when the sliding part 32 abuts against the limiting block 42 on the new beam frame structure 1. Fix the moved and stopped end wall 2 to the new beam frame structure 1 with bolts. Remove the extension frame 33 and the guide frame 31 on the old beam frame structure 1. Before moving the end wall 2, set up a column to support the beam frame structure 1 at the location of the end wall 2.

[0053] S5. Lay a new roof 11 on the new beam frame structure 1 and connect it with the old roof 11. Install the retaining wall 12 and the cover plate 22 onto the new beam frame structure 1 and the end wall 2.

[0054] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A construction process for easily extendable steel structure factory buildings, characterized in that: The extended steel structure workshop includes a beam frame structure (1), a roof (11) above the beam frame structure (1), and end walls (2) respectively located at both ends of the beam frame structure (1). A connecting mechanism (3) is provided between the end walls (2) and the beam frame structure (1) to connect the two. The connecting mechanism (3) includes several guide frames (31) fixed on the beam frame structure (1) and sliding members (32) fixed on the end walls (2). The guide frames (31) are slidably connected to the sliding members (32). The guide frames (31) pass through the end walls (2). The guide frames (31) extend far from the end walls (2). One end of the beam frame structure (1) is used to set an extension frame (33). The sliding member (32) is used to slide along the guide frame (31) and the extension frame (33). The guide frame (31) is provided with a limiting mechanism (4) to restrict the movement of the sliding member (32). The limiting mechanism (4) is respectively set on both sides of the sliding member (32) to abut against the sliding member (32). The limiting mechanism (4) includes a limiting seat (41) fixed on the guide frame (31), a limiting block (42) rotatably connected to the limiting seat (41), and a mechanism to push one end of the limiting block (42) to move away from the limiting seat (41). A limiting elastic element (43) is provided. The end of the limiting block (42) near the sliding member (32) is inclined away from the limiting seat (41). The limiting seat (41) is also provided with a limiting groove (412). The end of the limiting block (42) away from the sliding member (32) abuts against the limiting groove (412). An abutment block (44) is rotatably connected to the side wall of the limiting block (42). The rotation position of the abutment block (44) is located on the side of the rotation axis of the limiting block (42) away from the sliding member (32). The abutment block (44) is used to abut against the bottom of the limiting groove (412) near the sliding member (32). The end wall (2) has several mounting grooves (21) running through it. The sliding member (32) is disposed in the mounting groove (21). The side wall of the end wall (2) abuts against the beam frame structure (1). The end wall (2) can also be detachably connected with several cover plates (22) that close the side wall of the mounting groove (21) away from the beam frame structure. The end of the beam frame structure (1) near the end wall (2) is provided with a retaining edge (12) along its edge. The retaining edge (12) extends toward the end wall (2) and is disposed on the side of the end wall (2) away from the inner cavity of the beam frame structure (1). The construction process includes the following steps: S1. Remove the retaining edge (12) and cover plate (22), connect a new beam frame structure (1) for expansion to the end of the beam frame structure (1) that needs to be expanded, and install the beam frame structure (1) into shape; S2. Provide several extension frames (33) and several guide frames (31), install the extension frames (33) in the new beam frame structure (1) and align and fix the extension frames (33) with the guide frames (31) on the old beam frame structure (1), and install the guide frames (31) at the end of the guide frames (31) away from the old beam frame structure (1) and align and fix them. S3. Remove the bolts on the end wall (2) and the old beam frame structure (1), rotate the end of the limiting block (42) near the guide frame (31) close to the sliding part (32) to be parallel to the limiting seat (41), and rotate the abutting block (44) to abut against the limiting groove (412). S4. Push the end wall (2) along the extension frame (33) toward the interior of the new beam frame structure (1) until it is close to the guide frame (31), and stop when the sliding part (32) abuts against the limiting block (42) on the new beam frame structure (1). Fix the moved and stopped end wall (2) to the new beam frame structure (1) with bolts, and remove the extension frame (33) and the guide frame (31) on the old beam frame structure (1). S5. Lay a new roof (11) on the new beam frame structure (1) and connect it with the old roof (11). Install the flange (12) and cover plate (22) onto the new beam frame structure (1) and end wall (2).

2. The construction process for an easily extendable steel structure factory building according to claim 1, characterized in that: The upper end face of the limiting block (42) has a clearance hole (421) which is located on the side of the limiting block (42) away from the sliding member (32) on the rotation axis.

3. The construction process for an easily extendable steel structure factory building according to claim 1, characterized in that: On the end face of the end wall (2) away from the inner cavity of the beam frame structure (1), there are extension strips (23) perpendicular to the end wall (2). The extension strips (23) are located close to the beam frame structure (1) and are located on the side of the retaining edge (12) close to the inner cavity of the beam frame structure (1).

4. The construction process for an easily extendable steel structure factory building according to claim 3, characterized in that: The cover plate (22) is provided with a water-blocking strip (24) parallel to the extension strip (23), and the cover plate (22) and the water-blocking strip (24) are both provided with sealing strips on the side wall near the end wall (2).

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