Fabricated external wall panel with heat preservation function

Abstract

The invention relates to the field of thermal insulation external wall panels, in particular to a fabricated external wall panel with a thermal insulation function, which comprises a thermal insulation external wall panel, an elastic insert and the like. The fabricated external wall panel with the heat preservation function is mainly composed of the heat preservation external wall panels, the reinforcing net and the waterproof coating, a plurality of mortise lock structures are jointly arranged between the single heat preservation external wall panel and the upper and lower adjacent heat preservation external wall panels, and even if rivets and bonding layers for fixing the heat preservation external wall panels are aged and loosened, the heat preservation external wall panels can not be damaged. The heat preservation external wall panel is also protected by the anti-falling fixing of the adjacent heat preservation external wall panel through the mortise lock structures, when the loose heat preservation external wall panel is disassembled, a maintainer pulls the pull plate, the unlocking work of the multiple mortise lock structures can be completed in two batches, and the loose heat preservation external wall panel can be easily disassembled. The technical problem that when a ground anchor and a bonding layer used for fixing the rock wool external wall panel are aged and loosened, the danger phenomenon that the rock wool external wall panel falls from high altitude exists is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal insulation external wall panels, in particular to a prefabricated external wall panel with thermal insulation function. BACKGROUND

[0002] Although the rock wool external wall panel as a building external wall panel material with high efficient thermal insulation effect has a hydrophobic agent coated on its surface in the production process to enhance its waterproof ability, a large amount of water will adhere to the surface of the rock wool external wall panel in heavy rain, which will cause the hydrophobic ability to gradually disappear, and then the water vapor will enter the rock wool external wall panel, causing the thermal insulation and heat insulation ability to weaken, and then the heat exchange between the internal heat insulation area and the outside world will be strengthened, so that the temperature control equipment in the internal heat insulation area needs to increase the operating power to meet the temperature control demand, causing the building energy consumption to increase; and the rock wool external wall panel after absorbing water will reduce its mechanical structure strength, causing the risk of deformation and loosening. SUMMARY

[0003] In order to overcome the shortcomings that the rock wool wall panel is easy to cause the hydrophobic ability to disappear and weaken its own thermal insulation performance when a large amount of water is encountered, and affect its own mechanical structure strength, the present application provides a prefabricated external wall panel with thermal insulation function.

[0004] Technical scheme: a prefabricated external wall panel with thermal insulation function, comprising a thermal insulation external wall panel, an elastic plug, a pull plate, a pressing plate, a thermal insulation rubber pad, a reinforcing net, a thermal insulation nail and a waterproof coating; the thermal insulation external wall panel is provided with a movable cavity structure; the movable cavity structure of the thermal insulation external wall panel is slidably connected with the elastic plug; the front side of the thermal insulation external wall panel is slidably connected with the pull plate; the movable cavity structure of the thermal insulation external wall panel is slidably connected with the pressing plate which is tightly attached to the rear side of the middle part of the corresponding elastic plug; the pull plate is fixedly connected with the corresponding pressing plate; the internal space of the movable cavity structure of the thermal insulation external wall panel and the pressing plate are jointly filled with the thermal insulation rubber pad; the upper side and the lower side of the thermal insulation external wall panel are respectively provided with a plug hole structure; the upper side end of the elastic plug of the thermal insulation external wall panel is inserted into the plug hole structure of the corresponding thermal insulation external wall panel; the lower side end of the elastic plug of the thermal insulation external wall panel is inserted into the plug hole structure of the corresponding thermal insulation external wall panel; the reinforcing net is jointly laid between all the thermal insulation external wall panels; the reinforcing net is fixed on the front side surface of the corresponding thermal insulation external wall panel through the thermal insulation nail; a layer of waterproof coating is jointly coated between all the thermal insulation external wall panels, and the waterproof coating covers the reinforcing net; the plug hole structure of the thermal insulation external wall panel is fixedly connected with a thermal insulation rubber sleeve, and the thermal insulation rubber sleeve is provided with a sleeve opening structure which is sleeved on the outer surface of the end of the elastic plug; the end of the elastic plug is inserted into the sleeve opening structure of the thermal insulation rubber sleeve in the corresponding plug hole structure.

[0005] More preferably, it further comprises a crushing cone block; the pull plate is fixedly connected with the crushing cone block; the crushing cone block is fixedly connected with a plurality of spikes; the front side surface of the crushing cone block on the pull plate is flush with the front side surface of the waterproof coating. More preferably, the sleeve opening structure of the heat preservation rubber sleeve is arranged as a tightening structure that shrinks towards the interior of the corresponding heat preservation external wall panel.

[0006] More preferably, the elastic insert piece is provided with a protruding block structure at each end.

[0007] More preferably, the heat preservation nail is composed of a galvanized screw and a nylon expansion tube.

[0008] More preferably, the waterproof coating is composed of a silicone-acrylic copolymer.

[0009] More preferably, the pull plate is fixed with a reinforcing frame, and the reinforcing frame is wrapped around the front side outer edge of the corresponding heat preservation external wall panel.

[0010] More preferably, the waterproof sealant is coated and solidified between the surfaces of the contact areas of the two adjacent reinforcing frames.

[0011] More preferably, the front side of the reinforcing frame is provided with a knife edge structure.

[0012] Beneficial effects: The assembled external wall panel with heat preservation function described in the present application is mainly composed of a heat preservation external wall panel, a heat preservation nail, a reinforcing net and a waterproof coating. The waterproof coating prevents rainwater from invading and contacting the internal heat preservation external wall panel, thereby avoiding the phenomenon of heat preservation capacity failure of the heat preservation external wall panel, maintaining the heat preservation and insulation capacity for a longer time, reducing the working pressure of the temperature regulation equipment in the heat preservation and insulation area, and reducing the building energy consumption.

[0013] The reinforcing net is fixed on the surface of the heat preservation external wall panel by the heat preservation nail. In the normal assembly state, a plurality of mortise and tenon structures are provided between the single heat preservation external wall panel and the adjacent heat preservation external wall panels above and below, so that the heat preservation external wall panel can be firmly fixed with the adjacent heat preservation external wall panels through the plurality of mortise and tenon structures. Even if the anchor nails and the adhesive layer for fixing the heat preservation external wall panel are aged and loose, the heat preservation external wall panel is also protected from falling by the adjacent heat preservation external wall panel through the mortise and tenon structure. When the maintenance personnel disassemble the loose heat preservation external wall panel, the maintenance personnel pull the pull plate to unlock the plurality of mortise and tenon structures in two batches, so that the loose heat preservation external wall panel can be easily disassembled. The technical problem of the danger of high-altitude falling of the rock wool external wall panel caused by the aging and loosening of the anchor nails and the adhesive layer for fixing the rock wool external wall panel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 To describe the assembled state of the present application; Figure 2 To describe the assembled state of the present application; Figure 3Fig. 1 is a perspective view of the assembled thermal insulation external wall panel according to the present application; Figure 4 Fig. 4 is an exploded perspective view of the thermal insulation external wall panel, reinforcing mesh, thermal insulation nails and waterproof coating according to the present application; Figure 5 Fig. 5 is a perspective view of the thermal insulation external wall panel according to the present application; Figure 6 Fig. 6 is a first perspective sectional view of the thermal insulation external wall panel according to the present application; Figure 7 Fig. 7 is a second perspective sectional view of the thermal insulation external wall panel according to the present application; Figure 8 Fig. 8 is a perspective view of the pull plate according to the present application; Figure 9 Fig. 9 is an enlarged perspective view of the H region according to the present application; Figure 10 Fig. 10 is a perspective sectional view of the thermal insulation rubber sleeve according to the present application.

[0015] Reference signs: 1 - thermal insulation external wall panel, 101 - movable cavity structure, 102 - insertion hole structure, 103 - groove structure, 2 - elastic insertion sheet, 201 - protrusion structure, 3 - pull plate, 31 - crushing cone block, 32 - protrusion, 33 - reinforcing frame, 3301 - knife edge structure, 4 - pressing plate, 5 - thermal insulation rubber pad, 6 - thermal insulation rubber sleeve, 601 - sleeve opening structure, 7 - reinforcing mesh, 8 - thermal insulation nail, 9 - waterproof coating. DETAILED DESCRIPTION

[0016] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0017] Example 1: A kind of assembled external wall panel with thermal insulation function according to the present application, as shown in Fig. 1, comprises a movable cavity structure 101, an insertion hole structure 102, a groove structure 103, an elastic insertion sheet 2, a pull plate 3, a pressing plate 4, a thermal insulation rubber pad 5, a thermal insulation rubber sleeve 6, a reinforcing mesh 7, a thermal insulation nail 8 and a waterproof coating 9. Figures 1-10As shown, it comprises heat preservation outer wall board 1, elastic plug 2, pull plate 3, pressing plate 4, heat preservation rubber pad 5, reinforcing net 7, heat preservation nail 8 and waterproof coating 9; several heat preservation outer wall boards 1 are fixed on the wall body in the state of staggered distribution by anchor nails and adhesive layer; each heat preservation outer wall board 1 is provided with an active cavity structure 101; each active cavity structure 101 of each heat preservation outer wall board 1 is slidably connected with two elastic plugs 2; the front side of each heat preservation outer wall board 1 is slidably connected with a pull plate 3; the active cavity structure 101 of each heat preservation outer wall board 1 is slidably connected with a pressing plate 4, and the pressing plate 4 is tightly attached to the rear side of the middle part of the corresponding two elastic plugs 2; each pull plate 3 is fixedly connected with the corresponding pressing plate 4; the space inside the active cavity structure 101 of each heat preservation outer wall board 1 and the pressing plate 4 are jointly filled with a heat preservation rubber pad 5; each pull plate 3 is fixedly connected with two broken cone blocks 31; the upper side and the lower side of each heat preservation outer wall board 1 are provided with two insertion hole structures 102; the upper end of each elastic plug 2 of each heat preservation outer wall board 1 is respectively inserted into the corresponding two insertion hole structures 102 of the upper side of the heat preservation outer wall board 1; the lower end of each elastic plug 2 of each heat preservation outer wall board 1 is respectively inserted into the corresponding two insertion hole structures 102 of the lower side of the heat preservation outer wall board 1; in the normal assembly state, the end of each elastic plug 2 and the insertion hole structure 102 of the corresponding heat preservation outer wall board 1 form an insertion lock structure, and in this embodiment, each single heat preservation outer wall board 1 located in the non-edge area is provided with eight insertion lock structures between the four heat preservation outer wall boards 1 adjacent to it, so that the heat preservation outer wall board 1 can be firmly fixed with the four heat preservation outer wall boards 1 adjacent to it through the eight insertion lock structures; the front side of each heat preservation outer wall board 1 is provided with a groove structure 103 aligned with the middle part of the corresponding pull plate 3, so that the maintenance personnel can hold the pull plate 3 by passing the palm through the groove structure 103 and then reaching the rear side of the pull plate 3, which enables the maintenance personnel to hold the pull plate 3 more conveniently during the disassembly work of the loosened heat preservation outer wall board 1; several reinforcing nets 7 are jointly laid between the front side surfaces of all heat preservation outer wall boards 1; each reinforcing net 7 is fixed on the front side surface of the corresponding heat preservation outer wall board 1 by several heat preservation nails 8; a layer of waterproof coating 9 is jointly coated between the front side surfaces of all heat preservation outer wall boards 1, and the waterproof coating 9 covers the reinforcing net 7.

[0018] All the heat preservation nails 8 use heat preservation materials composed of galvanized screws and nylon expansion tubes, which reduce the heat conduction performance by three quarters compared with directly using metal nails, reduce the influence of temperature change caused by heat transfer from the outside temperature to the inside of the heat preservation external wall panel 1 through the heat preservation nails 8; the waterproof coating 9 uses a silicone-acrylic copolymer composed of a silicone-acrylic emulsion coating material, which has super hydrophobic performance, as well as excellent wide temperature stability, anti-ultraviolet aging and chemical corrosion resistance, is suitable for building external walls in various harsh environments, and can greatly reduce the influence of temperature changes in the outside environment on the indoor temperature, making the indoor temperature change less obvious, reducing the working pressure of the indoor temperature regulation equipment, and reducing the power consumption of the temperature regulation equipment.

[0019] Each heat preservation rubber sleeve 6 is fixed in the insertion hole structure 102 of each heat preservation external wall panel 1, and the sleeve opening structure 601 of the heat preservation rubber sleeve 6; the end of each elastic insert 2 is respectively inserted into the sleeve opening structure 601 of the heat preservation rubber sleeve 6 in the corresponding insertion hole structure 102; the sleeve opening structure 601 of each heat preservation rubber sleeve 6 is designed as a tightening structure that shrinks towards the inside of the corresponding heat preservation external wall panel 1, so that the sleeve opening structure 601 of the heat preservation rubber sleeve 6 has a strong clamping effect on the end of the elastic insert 2 towards the inside of the heat preservation external wall panel 1, and in the normal assembly state, the heat preservation rubber sleeve 6 can block the gap of the insertion hole structure 102 as much as possible, reduce heat exchange through the gap of the insertion hole structure 102, and improve the heat preservation effect of the heat preservation external wall panel 1.

[0020] Secondly, the sleeve opening structure 601 of the heat preservation rubber sleeve 6 tightly clamps the end of the elastic insert 2 towards the inside of the heat preservation external wall panel 1, and conversely, the sleeve opening structure 601 of the heat preservation rubber sleeve 6 has a weak clamping effect on the end of the elastic insert 2 away from the inside of the heat preservation external wall panel 1, so when the maintenance personnel disassemble the loosened heat preservation external wall panel 1, the more the end of the elastic insert 2 moves away from the inside of the heat preservation rubber sleeve 6, the less force is required to pull the end of the elastic insert 2 out of the sleeve opening structure 601 of the heat preservation rubber sleeve 6, making it easier for the maintenance personnel to pull the end of the elastic insert 2 out of the sleeve opening structure 601 of the heat preservation rubber sleeve 6; each elastic insert 2 is provided with a protruding block structure 201 at both ends, and the protruding block structure 201 of the end of the elastic insert 2 is tightly inserted into the sleeve opening structure 601 of the corresponding heat preservation rubber sleeve 6 towards the inside of the heat preservation external wall panel 1, improving the firmness of the end of the elastic insert 2 inserted into the sleeve opening structure 601 of the heat preservation rubber sleeve 6 in the normal assembly state.

[0021] The normal assembly state of the assembled outer wall panel with heat preservation function of the embodiment is as follows: all the heat preservation outer wall panels 1 are fixed on the wall body through anchor nails and adhesive layers, all the heat preservation outer wall panels 1 are in a staggered distribution state in the left-right direction, so that the upper side and the lower side of each single heat preservation outer wall panel 1 located in the non-edge area are adjacent to four heat preservation outer wall panels 1, and the upper end of the two elastic inserts 2 of the heat preservation outer wall panel 1 is respectively inserted into the corresponding insertion hole structure 102 of the two heat preservation outer wall panels 1 on the upper side, and the lower end of the two elastic inserts 2 of the heat preservation outer wall panel 1 is respectively inserted into the corresponding insertion hole structure 102 of the two heat preservation outer wall panels 1 on the lower side, and correspondingly, the insertion hole structure 102 of the heat preservation outer wall panel 1 is inserted with the elastic insert 2 of the adjacent heat preservation outer wall panel 1, and the end of each elastic insert 2 and the insertion hole structure 102 of the corresponding heat preservation outer wall panel 1 form an insertion lock structure, so that the heat preservation outer wall panel 1 and the four heat preservation outer wall panels 1 adjacent to the upper and lower sides are provided with eight insertion lock structures, and a plurality of reinforcing nets 7 are arranged between the front sides of all the heat preservation outer wall panels 1, the reinforcing nets 7 are fixed on the corresponding heat preservation outer wall panels 1 through heat preservation nails 8, the reinforcing nets 7 can strengthen the tight connection effect between the adjacent heat preservation outer wall panels 1, and simultaneously serve as a protective net framework cover on the front side of the heat preservation outer wall panel 1, thereby improving the structural strength of the whole assembled outer wall, and a waterproof coating 9 is coated between the front sides of all the heat preservation outer wall panels 1, the waterproof coating 9 can reduce the penetration of external moisture into the heat preservation outer wall panel 1, and improve the service life and heat preservation effect of the heat preservation outer wall panel 1. In the embodiment 2, on the basis of the embodiment 1, as shown in the figure, Figures 1-8 The broken cone block 31 is further included in the embodiment, the broken cone block 31 is fixed on the pull plate 3, a plurality of protrusions 32 are fixed on the broken cone block 31, the front side surface of the broken cone block 31 on the pull plate 3 is flush with the front side surface of the waterproof coating 9, the front side surface of the broken cone block 31 on the pull plate 3 is flush with the front side surface of the waterproof coating 9, and the broken cone block 31 exposed from the waterproof coating 9 can accurately indicate the area of the pull plate 3 of each heat preservation outer wall panel 1, a plurality of protrusions 32 are fixed on each broken cone block 31, and all the protrusions 32 are covered by the waterproof coating 9, so as to avoid the safety hazard of the body being pricked by the protrusions 32 exposed to the outside of the waterproof coating 9.

[0022] When the dismounting work of the assembled outer wall panel with heat preservation function in the embodiment is as follows, when the anchor nails and the bonding layer of a certain heat preservation outer wall panel 1 appear loosening phenomenon, the heat preservation outer wall panel 1 will swing back and forth under the action of external wind pressure and there is a security risk of falling, at this time the broken cone block 31 and the protruding spike 32 connected by the pull plate 3 on the heat preservation outer wall panel 1 keep swinging back and forth, so the broken cone block 31 and the protruding spike 32 which swing back and forth will pierce the waterproof coating 9 on the surface, so the maintenance personnel will obviously observe that there is a larger damaged area of the waterproof coating 9 in the alignment area of the broken cone block 31, and know that the heat preservation outer wall panel 1 corresponding to the area needs to be repaired and replaced, during the dismounting work of the loosened heat preservation outer wall panel 1, the maintenance personnel first dismounts the corresponding reinforcing net 7, heat preservation nails 8 and waterproof coating 9 on the front side of the heat preservation outer wall panel 1, exposes the heat preservation outer wall panel 1 to the outside air, then the maintenance personnel pulls the pull plate 3 to drive the pressing plate 4 to move forward, the pressing plate 4 drives the heat preservation rubber pad 5 to compress forward, at the same time, the pressing plate 4 pushes the middle part of the corresponding two elastic inserts 2 to move forward, so that the elastic inserts 2 are in the C-shaped structure of forward bending deformation, the two ends of the elastic inserts 2 are gathered to the middle and away from the corresponding insert hole structure 102 of the heat preservation outer wall panel 1, so that the unlocking work of the four insert locking structures between the heat preservation outer wall panel 1 and the adjacent four heat preservation outer wall panels 1 is completed, at this time, only four insert locking structures between the heat preservation outer wall panel 1 and the adjacent four heat preservation outer wall panels 1 are unlocked, the maintenance personnel directly continues to pull the pull plate 3 to drive the heat preservation outer wall panel 1 to move forward, because the end part of the elastic insert 2 has deformation elastic force, so the insert hole structure 102 of the heat preservation outer wall panel 1 will forcibly separate from the elastic insert 2 in the adjacent heat preservation outer wall panel 1 during the forward movement of the heat preservation outer wall panel 1, so that the unlocking work of the remaining four insert locking structures of the heat preservation outer wall panel 1 is completed, the unlocking work of eight insert locking structures is completed in two batches, so that the loosened heat preservation outer wall panel 1 can be easily dismounted and replaced.

[0023] In embodiment 3, on the basis of embodiment 1, Figures 1-7As shown, in the embodiment, each pull plate 3 is fixed with a reinforcing frame 33, and the reinforcing frame 33 is wrapped around the front side outer edge of the corresponding thermal insulation external wall panel 1. The reinforcing frame 33 can provide anti-collision protection for the front side outer edge area of the thermal insulation external wall panel 1, and improve the overall structural strength of the front side of the thermal insulation external wall panel 1. In the normal assembly state, the surface between each adjacent two reinforcing frames 33 is coated with waterproof sealant, which can improve the protection effect of preventing water vapor from penetrating inward between the adjacent two thermal insulation external wall panels 1. The front side of the reinforcing frame 33 at the edge area of each thermal insulation external wall panel 1 is provided with a knife edge structure 3301. When the maintenance personnel pull the pull plate 3 forward during the disassembly work of the loosened thermal insulation external wall panel 1, the pull plate 3 drives the reinforcing frame 33 to move forward away from the thermal insulation external wall panel 1. At the same time, the reinforcing frame 33 cuts off the waterproof sealant solidified on its surface through the knife edge structure 3301, so that the reinforcing frame 33 is not blocked by the waterproof sealant and smoothly moves forward away from the thermal insulation external wall panel 1.

[0024] The above embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the present application. Any equivalent changes made according to the content described in the claims of the present application shall be included in the scope of the claims of the present application.

Claims

1. A prefabricated exterior wall panel with thermal insulation function, comprising an insulated exterior wall panel (1); characterized in that, It also includes elastic inserts (2); each of the thermal insulation exterior wall panels (1) has a movable cavity structure (101); the movable cavity structure (101) of the thermal insulation exterior wall panel (1) is slidably connected to the elastic inserts (2); the front side of the thermal insulation exterior wall panel (1) is slidably connected to a pull plate (3); the movable cavity structure (101) of the thermal insulation exterior wall panel (1) is slidably connected to a pressure plate (4) closely attached to the rear side of the middle of the corresponding elastic inserts (2); the pull plate (3) is fixed to the corresponding pressure plate (4); the internal space of the movable cavity structure (101) of the thermal insulation exterior wall panel (1) and the pressure plate (4) are filled together. The insulation wall panel (1) is filled with a heat-insulating rubber pad (5); the upper and lower sides of the insulation wall panel (1) are respectively provided with a hole structure (102); the upper end of the elastic insert (2) of the insulation wall panel (1) is inserted into the corresponding hole structure (102) of the upper side of the insulation wall panel (1); the lower end of the elastic insert (2) of the insulation wall panel (1) is inserted into the corresponding hole structure (102) of the lower side of the insulation wall panel (1); a reinforcing mesh (7) is laid between all the insulation wall panels (1); the reinforcing mesh (7) is fixed to the front surface of the corresponding insulation wall panel (1) by heat-insulating nails (8); All the thermal insulation exterior wall panels (1) are coated with a waterproof coating (9), and the waterproof coating (9) covers the reinforcing mesh (7). The thermal insulation rubber sleeve (6) is fixed in the insertion structure (102) of the thermal insulation exterior wall panel (1), and the thermal insulation rubber sleeve (6) is provided with a sleeve structure (601) that is sleeved on the outer surface of the end of the elastic insert (2). The end of the elastic insert (2) is inserted into the sleeve structure (601) of the thermal insulation rubber sleeve (6) in the corresponding insertion structure (102).

2. The prefabricated exterior wall panel with thermal insulation function according to claim 1, characterized in that, It also includes a crushing cone (31); the crushing cone (31) is fixedly attached to the pull plate (3); several protrusions (32) are fixedly attached to the crushing cone (31), and the front surface of the crushing cone (31) on the pull plate (3) is flush with the front surface of the waterproof coating (9).

3. A prefabricated exterior wall panel with thermal insulation function according to claim 2, characterized in that, The sleeve structure (601) of the thermal insulation rubber sleeve (6) is designed as a tightening structure that shrinks inward toward the corresponding thermal insulation outer wall panel (1).

4. A prefabricated exterior wall panel with thermal insulation function according to claim 1, characterized in that, Each end of the elastic insert (2) is provided with a protrusion structure (201).

5. A prefabricated exterior wall panel with thermal insulation function according to claim 1, characterized in that, The insulation nail (8) uses insulation material composed of galvanized screws and nylon expansion tubes.

6. A prefabricated exterior wall panel with thermal insulation function according to claim 1, characterized in that, The waterproof coating (9) uses a silicone-acrylic emulsion coating material composed of an organosilicon-acrylic copolymer.

7. A prefabricated exterior wall panel with thermal insulation function according to any one of claims 1-6, characterized in that, A reinforcing frame (33) is fixed to the pull plate (3), and the reinforcing frame (33) wraps around the front outer edge of the corresponding thermal insulation wall panel (1).

8. A prefabricated exterior wall panel with thermal insulation function according to claim 7, characterized in that, Waterproof sealant is applied and solidified between the surfaces of the contact areas of two adjacent reinforcing frames (33).

9. A prefabricated exterior wall panel with thermal insulation function according to claim 8, characterized in that, The front side of the reinforcing frame (33) is designed with a knife edge structure (3301).

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