Sound insulation wall system and construction method thereof

Abstract

According to the sound insulation wall system and the construction method thereof, disordered installation can be achieved, and the construction and maintenance efficiency is high; the sound insulation effect is good, the layout is flexible, and the system can be applied to various application scenes. A multifunctional keel in the sound insulation wall system comprises a supporting face A and a hanging face which are oppositely arranged in the thickness direction of a wall body, and a side face A and a side face B which are oppositely arranged in the length direction of the wall body; an inserting seam and a hanging hole are formed in the hanging surface; the side face A and the side face B are provided with inserting and connecting seams B; the multifunctional keels are arranged on the two sides of the wall body in the thickness direction respectively. The sound insulation plate is mounted between the multifunctional keels on the two sides; the keel connector is used for limiting and fixing the sound insulation board; sound insulation cotton is filled between the adjacent multifunctional keels on each side; the limiting keel is mounted on the structural top plate, and the top of the multifunctional keel is limited in the limiting cavity in the corresponding side of the limiting keel; the bottom of the multifunctional keel is supported on the leveling unit; and the leveling unit is mounted on the structural bottom plate through the U-shaped keel.

Description

Technical Field

[0001] The invention relates to a sound insulation wall system, belonging to the technical field of building decoration. Background Art

[0002] In order to improve the sound insulation performance of the sound insulation wall system, a variety of products have been launched on the market. Their structure is optimized based on the solution of light steel keel gypsum board partition wall. The main components are top and bottom keels, sound insulation keels, through keels, cross-bracing keels, rock wool and double-layer gypsum boards.

[0003] At present, the following problems exist in the implementation of the sound insulation wall system:

[0004] First, it can only be installed in sequence, and the construction is inconvenient: Due to the shape restrictions of the ceiling and sound insulation keels, when installing sound insulation panels (usually calcium silicate panels), they can only be installed in sequence, and the installation flexibility is poor, resulting in low construction efficiency; and when there are design changes, material damage and replacement, and later maintenance and replacement, the entire sound insulation wall needs to be demolished, and the problem panels cannot be replaced individually.

[0005] Second, the sound insulation effect is poor: In the traditional sound insulation wall system, for the convenience of installation, there will be a gap between the sound insulation board in the middle and the floor keel. The sound insulation board is not directly connected to the floor, and needs to be filled with materials after installation; the calcium silicate board is installed in the middle, and its height is less than the height of the partition wall minus the size of the edge of the floor keel, so there will be a cavity on the top, which reduces its integrity and weakens the sound insulation performance;

[0006] Third, it is necessary to increase the decorative surface structure space on its basis: the traditional solution mostly uses gypsum board cover, the gypsum board is fixed to the keel with screws, and then putty and latex paint are applied on the gypsum board. If other decorative effects are required, the decorative surface structure is installed on the basis of the gypsum board. Summary of the invention

[0007] In view of this, the present invention provides a sound insulation wall system, which can achieve disordered installation and has high construction and maintenance efficiency; and has good sound insulation effect, flexible layout, and can be applied to a variety of application scenarios.

[0008] A sound insulation wall system, comprising:

[0009] Multifunctional keels, sound insulation panels, limit keels, keel connectors and leveling units;

[0010] The multifunctional keel comprises a supporting surface A and a hanging surface which are arranged oppositely in the thickness direction of the wall, and a side surface A and a side surface B which are arranged oppositely in the length direction of the wall; the hanging surface is provided with a plug-in seam and a hanging hole for installing a decorative panel; the side surface A and the side surface B are provided with a plug-in seam B for plugging in the keel connector;

[0011] A plurality of multifunctional keels are respectively arranged on both sides of the wall in the thickness direction, wherein the support surface A faces inward and the hanging surface faces outward; and the multifunctional keels on each side are arranged at intervals; the sound insulation board is installed between the multifunctional keels on both sides; one end of the keel connector is plugged into the plug-in seam B, and the other end is used for limiting and fixing the sound insulation board;

[0012] Sound insulation cotton is filled between the adjacent multifunctional keels on each side;

[0013] The limiting keel is installed on the structural top plate, and the top of the multifunctional keel is limited in the limiting cavity on the corresponding side of the limiting keel; the bottom of the multifunctional keel is supported on the leveling unit; the leveling unit is installed on the structural bottom plate through the U-shaped keel.

[0014] As a preferred embodiment of the present invention, the multifunctional keels on both sides of the wall are used in pairs, with positions corresponding to each other, to form a sound insulation wall with non-seam on both sides of the wall. As a preferred embodiment of the present invention, multifunctional keels are arranged at different positions on both sides according to the wall mounting requirements on each side of the wall, to form a sound insulation wall with non-seam on both sides of the wall.

[0015] As a preferred embodiment of the present invention: the limiting keel has two independent limiting cavities along the thickness direction of the wall, which are used to limit the multifunctional keels on both sides of the thickness direction;

[0016] An extension cavity is provided above each limiting cavity, the top surface of the extension cavity is connected to the structural top plate through a fastener, and the extension cavity is filled with sound-absorbing cotton.

[0017] As a preferred embodiment of the present invention: the leveling unit includes a leveling keel and a leveler;

[0018] The leveling keel has a concave cavity in the middle along the thickness direction of the wall for installing a leveler; the leveler can move up and down to adjust the height;

[0019] Support surfaces B are respectively provided on both sides of the concave cavity in the middle of the leveling keel for supporting the multifunctional keel on the corresponding side;

[0020] The upper surface of the leveler is also the support surface of the multifunctional keel. The upper surface of the leveler is symmetrically provided with limiting grooves on both sides along the wall thickness direction, which are used to limit the multifunctional keel on the symmetrical side;

[0021] Before installing the multifunctional keel, use the support surface B of the leveling keel as the horizontal reference plane and adjust the height of the upper surface of the leveler so that it is at the same level as the support surface B.

[0022] In addition, the present invention provides a construction method of the above-mentioned sound insulation wall system:

[0023] S1: First, install the limiting keel on the top plate of the structure; install the U-shaped keel and the leveling unit on the bottom plate of the structure, and adjust the leveling unit so that the upper surfaces of all the leveling units are flush;

[0024] S2: Then install the multifunctional keel; the multifunctional keel is arranged vertically, and the top is inserted into the limiting cavity on the corresponding side of the limiting keel to achieve temporary fixation of the multifunctional keel; along the length direction of the limiting keel, multiple multifunctional keels are arranged at intervals;

[0025] S3: Install the keel connector on one side: insert the plug-in part of the keel connector into the plug-in seams B on both sides of the multifunctional keel;

[0026] S5: Installing the sound insulation board: When the sound insulation board is installed, one side of the sound insulation board is placed against the keel connector and is limited by the limiting part of the keel connector; the bottom end of the sound insulation board is placed on the leveling unit;

[0027] After the sound insulation board is placed, the keel connector on the other side is installed; the sound insulation board is fixed to the middle of the wall by the keel connectors on both sides;

[0028] S6: Install sound insulation cotton; fill the sound insulation cotton between the adjacent multi-functional keels on each side;

[0029] S7: Fix the film-faced metal sheet to the multi-functional keel to form a closed partition wall.

[0030] Beneficial effects:

[0031] (1) In the sound insulation wall system of the present invention, the multifunctional keel is optimized to be split, and the material spacing is used to interrupt the propagation path and effectively block the sound propagation; and because it is a split keel, the flexible layout of the wall panels on both sides can be achieved; and the multifunctional keel using this structural form can achieve disordered installation, which is more efficient and more scientific in construction organization.

[0032] (2) The multifunctional keel of the present invention is designed with hanging holes and plug-in seams, which can realize the direct installation of the base plate; it is suitable for the installation of various decorative panels, can meet the different decorative effects on both sides of the wall, and realize the diversity of layout forms.

[0033] (3) The sound insulation system of the present invention has a better sound insulation effect: a sound insulation board is used in the middle of the system to block the propagation of sound. At the same time, sound insulation cotton is filled in the middle of the multifunctional keel, and sound insulation cotton is also added in the middle of the limit keel. The various components are tightly connected and it is not easy to produce gaps.

[0034] (4) The present invention can realize disordered installation, flexible installation, and convenient maintenance. The entire system does not need to be installed in order. Sound insulation boards, sound insulation cotton and other materials are not affected by the previous board or two adjacent boards. The installation efficiency is faster and the on-site construction is more flexible. At the same time, when there are design changes, material damage replacement and later maintenance and replacement, the problem board can be directly replaced without dismantling from the beginning. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of the sound insulation wall system with seams on both sides in Example 1;

[0036] Figure 2 is a vertical cross-sectional view of the sound insulation wall system in Example 1;

[0037] Figure 3 It is a structural schematic diagram of a multifunctional keel;

[0038] Figure 4 This is a schematic diagram of the structure for leveling the keel;

[0039] Figure 5 It is a structural schematic diagram of the limiting keel;

[0040] Figure 6 It is a structural schematic diagram of the keel connector;

[0041] Figure 7 It is a cross-sectional view of the sound insulation wall system with non-aligned seams on both sides in Example 2;

[0042] Among them: 1-film board, 2-limiting keel, 21-limiting cavity, 22-extension cavity, 3-sound insulation cotton, 4-multifunctional keel, 41-support surface A, 42-hanging surface, 421-hanging hole, 422-insertion seam A, 43-side A, 44-side B, 45-insertion seam B; 5-sound insulation board, 6-sound-absorbing cotton, 7-leveling keel, 701-concave cavity, 702-support surface B; 8-leveler, 9-U-shaped keel, 10-keel connector, 101-limiting part, 102-connector. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] Embodiment 1:

[0045] The present embodiment provides a soundproof wall system, which optimizes the traditional integrated keel (which is a whole along the wall thickness direction, that is, the width is the same as the wall thickness direction) into a split type (divided into two independent parts along the wall thickness direction), uses material spacing to interrupt the propagation path, effectively blocks the sound propagation, and has a good sound insulation effect; at the same time, due to the use of the split keel, the layout is flexible; and there is no need for orderly installation, the construction efficiency is higher, and the construction organization is more scientific.

[0046] like Figure 1 and Figure 2 As shown, the sound insulation wall system includes: a multifunctional keel 4, a sound insulation board 5, a sound insulation rock wool 3, a limit keel 2, a leveling keel 7 and a keel connector 2. As an example, the sound insulation board 5 is made of 12mm calcium silicate board.

[0047] The multifunctional keel 4 is not only used to install the sound insulation board 5, but also used to hang the decorative board. Figure 3 As shown, the multifunctional keel 4 is a frame structure with a rectangular cross section, including a supporting surface A41 and a hanging surface 42 that are relatively arranged in the wall thickness direction, and a side surface A43 and a side surface B44 that are relatively arranged in the wall length direction. The supporting surface A41 is a vertical plane, a plug-in seam 422 is arranged in the middle of the hanging surface 42, and hanging holes 421 are arranged on both sides of the plug-in seam 422; as an example, the plug-in seam A422 is formed by two V-shaped structures with oppositely arranged tips; the hanging holes 421 are arranged at intervals along the height direction of the hanging surface 42. There are plug-in seams B45 on the side surface A43 and the side surface B44 at relative positions (preferably in the middle position in the width direction) for plugging in the keel connector 10. When in use, the hanging surface 42 of the multifunctional keel 4 faces outward, and various decorative panels can be installed through the hanging holes 421 and the plug-in seam A422, without the need to add a decorative panel structure separately.

[0048] The width of the multifunctional keel 4 is less than half of the wall thickness, and the solution for the joints on both sides of the wall (such as Figure 1 As shown), the multifunctional keels 4 are used in pairs along the thickness direction of the wall, the supporting surfaces A41 are arranged relatively at intervals (the middle is used to set the sound insulation board), and the hanging surface 42 faces outwards.

[0049] The multifunctional keel with a substantial structure can be flexibly combined and can be used on both sides or on one side. Figure 1 Symmetrical setup as shown or Figure 7 The asymmetric arrangement shown in the figure) can be used as the keel system of the sound insulation wall. When a multifunctional keel 4 is fixed to the structural wall, the multifunctional keel 4 serves as the skeleton base of the decorative panel.

[0050] like Figure 6 As shown, the keel connector 10 has a horizontal limiting portion 101 and a plug-in portion 102 for plugging into the plug-in seam B45; wherein the limiting portion 101 is used to achieve limiting of the sound insulation board 5 in the thickness direction.

[0051] The limiting keel 2 is installed on the top plate of the structure to achieve temporary fixation of the multifunctional keel 4 during the construction process and ensure that the multifunctional keel 4 does not move forward or backward after the construction is completed (i.e., to achieve the limitation of the multifunctional keel 4). The limiting keel 2 is horizontally arranged along the long end direction of the wall, such as Figure 5 As shown, the limiting keel 2 has two independent limiting cavities 21 along the wall thickness direction, which are used to limit the multifunctional keels 4 on both sides of the thickness direction, that is, the top of the multifunctional keel 4 is installed in the limiting cavity 21 on the corresponding side of the top and bottom limiting keel 2, and the multifunctional keel 4 can be temporarily fixed through the limiting cavity 21. There is an extension cavity 22 above each limiting cavity 21, and the top surface of the extension cavity 22, that is, the top surface of the limiting keel 2, is connected to the structural top plate through fasteners, and the extension cavity 22 is filled with sound-absorbing cotton 6.

[0052] The bottom of the multifunctional keel 4 is placed on the leveling unit, and the leveling unit adjusts the height of the multifunctional keel 4 so that the bottoms of all the multifunctional keels 4 are located in the same horizontal plane, thereby ensuring the level of the sound insulation wall system. Specifically: the leveling unit includes a leveling keel 7 and a leveler 8; Figure 4 As shown, the leveling keel 7 is arranged horizontally along the long end direction of the wall, and the middle part of the leveling keel 7 (the middle part along the thickness direction of the wall) has a concave cavity 701 for installing the leveler 8, and the leveler 8 can move up and down for height adjustment; the two sides of the concave cavity in the middle of the leveling keel 7 are respectively provided with support surfaces B702 for supporting the multifunctional keel 4 on the corresponding side. The upper surface of the leveler 8 is also the support surface of the multifunctional keel, and the upper surface of the leveler 8 is symmetrically provided with limiting grooves on both sides along the thickness direction of the wall, which are used to limit the multifunctional keel on the symmetrical side. Before installing the multifunctional keel, the support surface B702 of the leveling keel 7 is used as the horizontal reference surface, and the height of the upper surface of the leveler 8 is adjusted to be at the same horizontal height as the support surface B702; the multifunctional keel 4 is installed, and one side of the lower end of the multifunctional keel 4 is supported on the support surface B702, and the other side is supported on the upper surface of the leveler 8, and the side is limited in the limiting groove on the upper surface of the leveler 8.

[0053] In addition, a U-shaped keel 9 is installed on the structural bottom plate for positioning the sound insulation wall system; and the leveling unit is installed on the U-shaped keel 9 .

[0054] like Figure 1 and Figure 2 As shown, in the sound insulation wall system, the limit keel 2 is horizontally installed on the top plate of the structure; the multifunctional keels 4 are used in pairs, two in a group; multiple groups of multifunctional keels 4 are arranged at intervals along the length direction of the wall, and the supporting surfaces A41 of two multifunctional keels 4 in each group are arranged at intervals, and the top of the multifunctional keel 4 is limited in the limit cavity 21 on the corresponding side of the limit keel 2. After the multifunctional keel 4 is installed (after the installation is completed, the top of the multifunctional keel 4 is connected to the limit keel 2 by fasteners), the keel connector 10 (such as Figure 1As shown, the keel connector 10 on one side in the thickness direction is uniformly installed, and the plug-in portion 102 of the keel connector 10 is inserted into the plug-in seam B45 on both sides of the multifunctional keel 4. The sound insulation board 5 is installed between the multifunctional keels 4 on both sides in the thickness direction, and the keel connector 10 is used to realize the positioning of the sound insulation board 5 during the installation process and the fixation after installation. In this solution, the size of the sound insulation board 5 is not limited, and it can be a full length or any length splicing; the sound insulation board 5 can be installed uniformly after the multifunctional keel 4 and the keel connector 10 on one side are installed (the sound insulation board 5 is installed after the multifunctional keels 4 on both sides are installed). In this example, the sound insulation board 5 is divided into two specifications, one is a regular length (about 960mm), and the other is a length of 45mm. The bottom end of the sound insulation board is placed on the leveling unit and is fixed to the middle of the wall by the keel connectors 10 on both sides. The sound insulation board 5 and the keel connector 10 are firmly fixed by fastening screws. Sound insulation cotton 3 is filled between the adjacent multifunctional keels 4 on each side; finally, a laminated metal plate is arranged on the outer surfaces of both sides, and the laminated metal plate is fixed on the multifunctional keel 4 on the corresponding side, thereby forming a closed partition wall.

[0055] Holes are arranged on the outermost coated metal plate on each side at positions corresponding to the hanging holes 421 and the plug-in seams A422 on the multifunctional keel 4, so that the system can directly install decorative panels, and two forms of panel installation can be realized, one is hanging, the other is plug-in.

[0056] The core components of this sound insulation system are a split multifunctional keel 4 (divided into two parts along the thickness direction), a limiting keel 2, a leveling keel 7 and a keel connector 10. The original integrated sound insulation keel is innovated and optimized into a split multifunctional keel 4, which can adapt to more decoration scenes. The limiting keel 3 is also different from the conventional system. The multifunctional keel 4 can be temporarily fixed and limited by the structural setting. The left and right sides of the multifunctional keel 4 are designed with plug-in seams B45, which are used in conjunction with the keel connector 10 to achieve disordered installation of the entire system. At the same time. The multifunctional keel 4 combines the hanging holes 421 and the plug-in seams A422, which can meet the needs of various forms of hanging panels and realize more installation requirements.

[0057] The installation steps of the sound insulation wall system are:

[0058] S1: First, install the limiting keel 2 on the top plate of the structure; install the U-shaped keel 9 and the leveling unit on the bottom plate of the structure, and adjust the height of the leveler 8 in the leveling unit so that the upper surface of the leveler 8 is flush with the supporting surface B702 of the leveling keel 7;

[0059] S2: Then install the multifunctional keel 4; the multifunctional keel 4 is set vertically and used in pairs; the top is inserted into the limiting cavity 21 on the corresponding side of the limiting keel 2 to achieve temporary fixation of the multifunctional keel 4 and ensure that the multifunctional keel 4 does not move forward and backward. Multiple groups of multifunctional keels 4 are arranged at intervals along the length direction of the limiting keel 2. The multifunctional keel 4 is a bearing member of the sound insulation board 5.

[0060] S3: After the multifunctional keel 4 is installed (after the installation, the top of the multifunctional keel 4 is connected to the limiting keel 2 by fasteners), the keel connector 10 on one side is uniformly installed (such as Figure 1 As shown, the keel connector 10 is uniformly arranged on one side in the thickness direction, and the connector portion 102 of the keel connector 10 is inserted into the inserting seams B45 on both sides of the multifunctional keel 4.

[0061] S5: Then install the sound insulation board 5, which is a 12 mm thick calcium silicate board in this example; the sound insulation board 5 is located in the middle of the thickness direction of the sound insulation wall system, and is positioned and installed through the multifunctional keel 4 and the keel connector 10. After the keel connector 10 on one side of the sound insulation board 5 is installed, it is installed uniformly.

[0062] When the sound insulation board 5 is installed, one side is placed on the keel connector 10, and the bottom end is placed on the leveling unit. After the sound insulation board 5 is placed, the keel connector 10 on the other side is installed in sequence. The sound insulation board 5 is fixed to the middle of the wall by the multifunctional keels 4 and the keel connector 10 on both sides, and then the sound insulation board 4 and the keel connector 10 are firmly fixed with self-tapping screws.

[0063] S6: Install the sound insulation cotton 3, which is the fireproof and sound-absorbing material of the sound insulation wall. It is located on both sides of the sound insulation board 5 along the thickness direction of the sound insulation wall system to enhance the sound insulation and fire resistance performance of the partition wall.

[0064] S7: After filling the sound insulation cotton 3, the laminated metal plate is fixed on the multifunctional keel 4 to form a closed partition wall.

[0065] Embodiment 2:

[0066] Since the multifunctional keel 4 is a split type, the multifunctional keel 4 is also suitable for scenes where the two sides of the wall are not aligned in the thickness direction, such as Figure 7 As shown, the multifunctional keels 4 on both sides in the thickness direction are not arranged symmetrically, but are arranged at different positions on both sides according to the corresponding side wall mounting requirements.

[0067] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A sound insulation wall system, characterized in that: include: Multifunctional keels, sound insulation panels, limit keels, keel connectors and leveling units; The multifunctional keel comprises a supporting surface A and a hanging surface which are arranged oppositely in the thickness direction of the wall, and a side surface A and a side surface B which are arranged oppositely in the length direction of the wall; the hanging surface is provided with a plug-in seam and a hanging hole for installing a decorative panel; the side surface A and the side surface B are provided with a plug-in seam B for plugging in the keel connector; A plurality of multifunctional keels are respectively arranged on both sides of the wall in the thickness direction, wherein the support surface A faces inward and the hanging surface faces outward; and the multifunctional keels on each side are arranged at intervals; the sound insulation board is installed between the multifunctional keels on both sides; one end of the keel connector is plugged into the plug-in seam B, and the other end is used for limiting and fixing the sound insulation board; Sound insulation cotton is filled between the adjacent multifunctional keels on each side; The limiting keel is installed on the structural top plate, and the top of the multifunctional keel is limited in the limiting cavity on the corresponding side of the limiting keel; the bottom of the multifunctional keel is supported on the leveling unit; the leveling unit is installed on the structural bottom plate through the U-shaped keel.

2. The sound insulation wall system according to claim 1, characterized in that: The multifunctional keels on both sides of the wall are used in pairs, with positions corresponding to each other, so as to form a sound insulation wall with butt joints on both sides of the wall.

3. The sound insulation wall system according to claim 1, characterized in that: According to the wall hanging requirements on each side of the wall, multifunctional keels are set at different positions on both sides to form a sound insulation wall with no seams on both sides of the wall.

4. The sound insulation wall system according to claim 1, 2 or 3, characterized in that: The limiting keel has two independent limiting cavities along the thickness direction of the wall, which are used to limit the multifunctional keels on both sides of the thickness direction; An extension cavity is provided above each limiting cavity, the top surface of the extension cavity is connected to the structural top plate through a fastener, and the extension cavity is filled with sound-absorbing cotton.

5. The sound insulation wall system according to claim 1, 2 or 3, characterized in that: The leveling unit includes a leveling keel and a leveler; The leveling keel has a concave cavity in the middle along the thickness direction of the wall for installing a leveler; the leveler can move up and down to adjust the height; Support surfaces B are respectively provided on both sides of the concave cavity in the middle of the leveling keel for supporting the multifunctional keel on the corresponding side; The upper surface of the leveler is also the support surface of the multifunctional keel. The upper surface of the leveler is symmetrically provided with limiting grooves on both sides along the wall thickness direction, which are used to limit the multifunctional keel on the symmetrical side; Before installing the multifunctional keel, use the support surface B of the leveling keel as the horizontal reference plane and adjust the height of the upper surface of the leveler so that it is at the same level as the support surface B.

6. A construction method of a sound insulation wall system, characterized in that: The sound insulation wall system is the sound insulation wall system according to any one of claims 1 to 5; S1: First, install the limiting keel on the top plate of the structure; install the U-shaped keel and the leveling unit on the bottom plate of the structure, and adjust the leveling unit so that the upper surfaces of all the leveling units are flush; S2: Then install the multifunctional keel; the multifunctional keel is arranged vertically, and the top is inserted into the limiting cavity on the corresponding side of the limiting keel to achieve temporary fixation of the multifunctional keel; along the length direction of the limiting keel, multiple multifunctional keels are arranged at intervals; S3: Install the keel connector on one side: insert the plug-in part of the keel connector into the plug-in seams B on both sides of the multifunctional keel; S5: Installing the sound insulation board: When the sound insulation board is installed, one side of the sound insulation board is placed against the keel connector and is limited by the limiting part of the keel connector; the bottom end of the sound insulation board is placed on the leveling unit; After the sound insulation board is placed, the keel connector on the other side is installed; the sound insulation board is fixed to the middle of the wall by the keel connectors on both sides; S6: Install sound insulation cotton; fill the sound insulation cotton between the adjacent multi-functional keels on each side; S7: Fix the film-faced metal sheet to the multi-functional keel to form a closed partition wall.

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