Fourth-generation residential building roof truss cantilever supporting device

Abstract

The invention discloses a fourth-generation residential building roof truss overhanging supporting device which comprises a transverse supporting beam horizontally embedded in an overhanging plate, one end of the transverse supporting beam extends into a bearing wall and is fixedly connected with a reinforcement cage in the bearing wall, a first cavity is defined in the transverse supporting beam, a communicating pipe is installed in the first cavity, and a second cavity is formed in the second cavity; a first water drainage pipe is arranged in the cantilever plate, the upper end of the first water drainage pipe communicates with a floor drain arranged on the upper surface of the cantilever plate, and the lower end of the first water drainage pipe extends into the first cavity to communicate with one end of a communicating pipe. The fourth-generation residential building roof truss overhanging supporting device has the beneficial effects that the fourth-generation residential building roof truss overhanging supporting device is designed in a hidden mode, the supporting beam is arranged in the overhanging and building roof truss outer wall so that the fourth-generation residential building roof truss overhanging supporting device can be suitable for a terrace with the large overhanging length and width, meanwhile, the lower drainage pipe and the connecting pipe can be arranged in the supporting beam, and the fourth-generation residential building roof truss overhanging supporting device is attractive and convenient to maintain daily.

Description

Technical Field

[0001] The invention relates to the field of construction, and in particular to a fourth-generation residential building roof truss cantilever support device. Background Art

[0002] The fourth generation of housing, also known as courtyard housing, three-dimensional garden ecological housing or urban forest garden building, is a derivative of green buildings. A major feature of this type of housing is that it has a large terrace, which is generally a free area. Therefore, this type of housing generally has a high house rate and can achieve zero or negative public area. The large terrace can be used to plant flowers and plants, rest, enjoy the scenery, and even have a barbecue, so it is very popular among home buyers.

[0003] The terrace design of the fourth generation of residential buildings usually protrudes from the main body of the building roof frame to form a cantilever structure. Since the terrace has a large cantilever length and width, a cantilever support device is required for support. Common cantilever support devices include hidden and exposed types. The exposed cantilever support device is shaped like a diagonal brace, and the upper and lower ends of the diagonal brace are respectively connected to the lower surface of the terrace and the outer wall of the building roof frame below the terrace. This exposed cantilever support device is not only unsightly, but also occupies the activity space of the terrace, and has gradually been replaced by a hidden cantilever support device. The common hidden cantilever support device generally extends the main steel cage of the building roof frame to form a steel mesh supporting the cantilever, and then the cantilever steel mesh and the main steel cage of the building roof frame are cast in one piece. This hidden cantilever support device has a low construction cost and good support stability. It is very suitable for the fourth generation residential buildings where the cantilever length and width of the terrace are not very large. Therefore, if the cantilever length and width of the terrace are very large, this hidden cantilever support device cannot be used.

[0004] In addition, whether the terrace of the fourth-generation residence adopts a hidden cantilever support device or an exposed cantilever support device, it is still necessary to install a downdrain pipe on the outer wall of the building roof frame and a connecting pipe on the lower surface of the terrace to connect the floor drain on the upper surface of the terrace and the downdrain pipe on the outer wall of the building roof frame. The downdrain pipe and the connecting pipe are exposed to the outside, affecting the appearance of the terrace. Summary of the invention

[0005] The main purpose of the present invention is to propose a fourth-generation residential building roof truss cantilever support device, aiming to solve the problems mentioned in the above background technology.

[0006] In order to solve the above problems, the present invention proposes a fourth generation residential building roof truss cantilever support device, comprising: A transverse support beam is horizontally buried in the cantilever plate, one end of the transverse support beam extends into the load-bearing wall and is fixedly connected to the steel cage in the load-bearing wall, a cavity 1 is defined in the transverse support beam, a connecting pipe is installed in the cavity 1, a drainage pipe 1 is arranged in the cantilever plate, the upper end of the drainage pipe 1 is connected to a floor drain arranged on the upper surface of the cantilever plate, and the lower end of the drainage pipe 1 extends into the cavity 1 and is connected to one end of the connecting pipe; The vertical support beam is vertically buried in the load-bearing wall and is fixedly connected to the steel cage and the horizontal support beam in the load-bearing wall. Cavity 2 is defined in the vertical support beam, and Cavity 2 is connected to Cavity 1. A vertically extending drainage pipe 2 is arranged in Cavity 2, and Drainage pipe 2 passes through Cavity 1 and is connected to the other end of the connecting pipe.

[0007] In one embodiment, the lower end of the drainage pipe 1 extends into the cavity 1 and is connected to the connecting pipe through the water trap.

[0008] In one embodiment, the lower surface of the cantilever plate is provided with an inspection port 1 connected to the cavity 1, and the inspection port 1 is close to the connecting pipe and the drain pipe 1; The second drainage pipe is provided with an inspection pipe, and the outer wall of the load-bearing wall is provided with a second inspection port connected with the second cavity, and the second inspection port is close to the inspection pipe; The inspection opening 1 and the inspection opening 2 are both provided with sacrificial anodes. The sacrificial anode in the inspection opening 1 is detachably arranged in close contact with the horizontal support beam, and the sacrificial anode in the inspection opening 2 is detachably arranged in close contact with the vertical support beam.

[0009] In one embodiment, both inspection opening 1 and inspection opening 2 are detachably connected with decorative cover plates, the decorative cover plate in inspection opening 1 is flush with the lower surface of the cantilever plate, and the decorative cover plate in inspection opening 2 is vertically aligned with the outer wall of the load-bearing wall.

[0010] In one embodiment, the sacrificial anode includes a U-shaped anode plate and an extrusion frame, wherein the U-shaped anode plate can be extended into the first cavity or the second cavity and closely attached to the inner wall of the horizontal support beam or the vertical support beam, and the extrusion frame can be detachably inserted into the U-shaped anode plate and cooperate with the horizontal support beam or the vertical support beam to clamp and fix the U-shaped anode plate; The metal reducing property of the U-shaped anode plate is greater than the metal reducing property of the horizontal support beam and the vertical support beam.

[0011] In one embodiment, a telescopic plate is sandwiched between the extrusion frame and the inner wall of the U-shaped anode plate, and the extrusion frame and the U-shaped anode plate compress the telescopic plate to reduce the thickness of the telescopic plate.

[0012] In one embodiment, the two ends of the U-shaped anode plate in contact with the inner wall of the horizontal support beam or the vertical support beam are folded outwards of the U-shaped anode plate to form a bent edge, and the bent edge is in close contact with the lower surface of the horizontal support beam or the vertical support beam.

[0013] In one embodiment, a diagonal bracing beam is embedded in the load-bearing wall, and the upper and lower ends of the diagonal bracing beam are respectively fixedly connected to the horizontal supporting beam and the vertical supporting beam.

[0014] Beneficial effects: The fourth-generation residential building roof truss cantilever support device of the present application adopts a hidden design, and is suitable for terraces with large cantilever length and width by placing the support beam inside the cantilever and the building roof truss outer wall. At the same time, the downpipe and the connecting pipe can be arranged inside the support beam, which is both beautiful and convenient for daily maintenance; The support beam of the fourth-generation residential building roof truss cantilever support device of the present application is provided with a sacrificial anode, which protects the main body of the support beam from rusting, thereby achieving long-term, reliable and stable support of the cantilever structure. At the same time, inspection openings are reserved on the cantilever and the outer wall of the building roof truss, making the disassembly, assembly and replacement of the sacrificial anode simple, convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the fourth generation of the residential building roof truss cantilever support device of the present invention; Figure 2 It is the internal structure diagram of the cantilever support device for the roof truss of a fourth generation residential building of the present invention; Figure 3 yes Figure 2 Schematic diagram after removing the steel cage; Figure 4 It is a schematic diagram of the structure of the sacrificial anode of the present invention; Figure 5 It is a structural schematic diagram of the telescopic plate of the present invention; Figure 6 It is a schematic diagram of the installation of the sacrificial anode of the present invention.

[0017] The following are the descriptions of the reference numerals: 1. Load-bearing wall; 2. Cantilever slab; 3. Steel cage; 4. Horizontal support beam; 5. Vertical support beam; 6. Diagonal support beam; 7. Inspection opening 1; 8. Inspection opening 2; 9. Drain pipe 1; 10. Floor drain; 11. Trap pipe; 12. Drain pipe 2; 13. Inspection pipe; 14. sacrificial anode; 141. U-shaped anode plate; 142. bent edge; 143. telescopic plate; 144. extrusion frame; 15. Decorative cover plate; 16. Cavity 1; 17. Through hole; 18. Cavity 2; 19. Connecting pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] The fourth generation of housing, also known as courtyard housing, three-dimensional garden ecological housing or urban forest garden building, is a derivative of green buildings. A major feature of this type of housing is that it has a large terrace, which is generally a free area. Therefore, this type of housing generally has a high house rate and can achieve zero or negative public area. The large terrace can be used to plant flowers and plants, rest, enjoy the scenery, and even have a barbecue, so it is very popular among home buyers.

[0023] The terrace design of the fourth generation of residential buildings usually protrudes from the main body of the building roof frame to form a cantilever structure. Since the terrace has a large cantilever length and width, a cantilever support device is required for support. Common cantilever support devices include hidden and exposed types. The exposed cantilever support device is shaped like a diagonal brace, and the upper and lower ends of the diagonal brace are respectively connected to the lower surface of the terrace and the outer wall of the building roof frame below the terrace. This exposed cantilever support device is not only unsightly, but also occupies the activity space of the terrace, and has gradually been replaced by a hidden cantilever support device. The common hidden cantilever support device generally extends the main steel cage of the building roof frame to form a steel mesh supporting the cantilever, and then the cantilever steel mesh and the main steel cage of the building roof frame are cast in one piece. This hidden cantilever support device has a low construction cost and good support stability. It is very suitable for the fourth generation residential buildings where the cantilever length and width of the terrace are not very large. Therefore, if the cantilever length and width of the terrace are very large, this hidden cantilever support device cannot be used.

[0024] In addition, whether the terrace of the fourth-generation residence adopts a hidden cantilever support device or an exposed cantilever support device, it is still necessary to install a downdrain pipe on the outer wall of the building roof frame and a connecting pipe on the lower surface of the terrace to connect the floor drain on the upper surface of the terrace and the downdrain pipe on the outer wall of the building roof frame. The downdrain pipe and the connecting pipe are exposed to the outside, affecting the appearance of the terrace.

[0025] The present invention proposes a fourth-generation residential building roof truss cantilever support device, which adopts a hidden design. By placing the supporting beam into the cantilever and the interior of the building roof truss outer wall, it is suitable for terraces with large cantilever length and width. At the same time, the downpipe and the connecting pipe can be arranged in the supporting beam, which is both beautiful and convenient for daily maintenance. In addition, the supporting beam of the fourth-generation residential building roof truss cantilever support device of the present application is provided with a sacrificial anode 14, which protects the supporting beam body from rusting through the sacrificial anode 14, thereby achieving long-term, reliable and stable support of the cantilever structure. At the same time, maintenance openings are reserved on the cantilever and the exterior wall of the building roof truss, so that the disassembly, assembly and replacement of the sacrificial anode 14 and the maintenance of the downpipe and the connecting pipe are simple, convenient and fast.

[0026] Specifically, in one embodiment of the invention, Figure 1 and Figure 2As shown, the fourth generation residential building includes a load-bearing wall 1 and a cantilevered plate 2 arranged on the outer wall of the load-bearing wall 1, a steel cage 3 is arranged in the load-bearing wall 1, and the cantilevered plate 2 is extended to form a terrace. Two adjacent terraces are arranged at equal intervals, and a floor drain 10 is buried on the upper surface of each terrace. A vertically extending drain pipe 2 12 is arranged next to the load-bearing wall 1, and the floor drain 10 of each terrace is connected to the drain pipe 2 12 through a drain pipe 1 9 and a connecting pipe 19, and the drain pipe 1 9 and the connecting pipe 19 are connected.

[0027] In this embodiment, the fourth generation residential building roof truss cantilever support device includes a horizontal support beam 4 and a vertical support beam 5. Figure 1-Figure 3 As shown, the transverse support beam 4 is horizontally embedded in the cantilever plate 2, one end of the transverse support beam 4 extends into the load-bearing wall 1 and is fixedly connected to the steel cage 3 in the load-bearing wall 1, as shown in FIG. Figure 1 As shown, a plurality of transverse support beams 4 are arranged in a horizontal straight line in a cantilever plate 2, so as to stably support and fix the cantilever plate 2, so that the cantilever length and width of the cantilever plate 2 can be designed to be very large, so that the fourth-generation residential building roof truss cantilever support device of this embodiment is suitable for terraces with large cantilever length and width. The vertical support beams 5 are vertically buried in the load-bearing wall 1 and are fixedly connected to the steel cage 3 and the transverse support beams 4 in the load-bearing wall 1. The arrangement of the vertical support beams 5 further enhances the support stability of the transverse support beams 4 and the cantilever plate 2, so that the fourth-generation residential building roof truss cantilever support device of this embodiment is suitable for terraces with large cantilever length and width; and the transverse support beams 4 and the vertical support beams 5 are placed inside the cantilever and the outer wall of the building roof truss, and adopt a hidden design, so they are not exposed to the outside and do not affect the beauty of the terrace.

[0028] In this embodiment, if Figure 1 As shown, the cross section of the transverse support beam 4 is U-shaped. With this design, a cavity 16 can be defined in the transverse support beam 4. Figure 2 and Figure 3 As shown, the connecting pipe 19 is installed in the cavity 16, the drain pipe 19 is arranged in the cantilever plate 2, the upper end of the drain pipe 9 is connected to the floor drain 10 arranged on the upper surface of the cantilever plate 2, and the lower end of the drain pipe 9 extends into the cavity 16 and is connected with one end of the connecting pipe 19; the cross-section of the vertical support beam 5 is the same as the cross-section of the horizontal support beam 4, and the vertical support beam 5 defines a cavity 2 18, and the cavity 2 18 is connected with the cavity 16, and the cavity 2 18 is provided with the vertically extending drain pipe 2 12, which passes through the cavity 16 and is connected with the other end of the connecting pipe 19. With this design, the lower drain pipe and connecting pipe on the conventional terrace (that is, the drain pipe 1 9, the drain pipe 2 12, and the connecting pipe 19 in this embodiment) can be arranged in the support beam without being exposed to the outside, so that the appearance of the terrace appears beautiful.

[0029] In this embodiment, if Figure 3 As shown, the lower end of the drain pipe 19 extends into the cavity 16 and is connected to the connecting pipe 19 through the trap pipe 11. This design can prevent the odor in the drain pipe 12 from entering the drain pipe 19 through the connecting pipe 19 and then escaping from the floor drain 10 to pollute the air above the terrace.

[0030] In this embodiment, if Figure 2 and Figure 3 As shown, the lower surface of the cantilever plate 2 is provided with an inspection port 7 connected to the cavity 16, and the inspection port 7 is close to the connecting pipe 19 and the drain pipe 19. The drain pipe 12 is provided with an inspection pipe 13. The outer wall of the load-bearing wall 1 is provided with an inspection port 2 8 connected to the cavity 2 18, and the inspection port 2 8 is close to the inspection pipe 13. This design facilitates the daily maintenance of the drain pipe 19, the drain pipe 12, and the connecting pipe 19 without damaging the fourth-generation residential building roof truss cantilever support device of this embodiment.

[0031] Furthermore, in this embodiment, if Figure 3 As shown, both the inspection opening 1 7 and the inspection opening 2 8 are detachably connected with a decorative cover plate 15. The decorative cover plate 15 in the inspection opening 1 7 is flush with the lower surface of the cantilever plate 2, and the decorative cover plate 15 in the inspection opening 2 8 is vertically aligned with the outer wall of the load-bearing wall 1. This design does not affect the appearance of the terrace and facilitates the maintenance of the terrace.

[0032] Furthermore, in this embodiment, if Figure 3 As shown, both the inspection port 1 7 and the inspection port 2 8 are provided with a sacrificial anode 14. The sacrificial anode 14 in the inspection port 1 7 is detachably arranged close to the horizontal support beam 4, and the sacrificial anode 14 in the inspection port 2 8 is detachably arranged close to the vertical support beam 5. With this design, the sacrificial anode 14 protects the support beam from rusting in a humid environment, so that the support beam can stably and reliably support the cantilever structure for a long time, greatly extending the service life of the support beam. At the same time, the inspection port 1 7 and the inspection port 2 8 are reserved on the outer wall of the cantilever and the building roof truss, so that the disassembly, assembly and replacement of the sacrificial anode 14 are simple, convenient and quick. The humid environment in which the support beam is located comes from the external weather and the condensed water vapor on the outer pipe wall of the drain pipe 1 9, the drain pipe 2 12 and the connecting pipe 19.

[0033] Specifically, Figure 4 and Figure 6As shown, the sacrificial anode 14 includes a U-shaped anode plate 141 and an extrusion frame 144. The U-shaped anode plate 141 can be extended into cavity 16 or cavity 2 18 and is tightly arranged against the inner wall of the horizontal support beam 4 or the vertical support beam 5. The extrusion frame 144 can be detachably inserted into the U-shaped anode plate 141, and cooperates with the horizontal support beam 4 or the vertical support beam 5 to clamp and fix the U-shaped anode plate 141. This installation form not only ensures that the sacrificial anode 14 is firmly installed and easy to assemble and disassemble, but also makes the U-shaped anode plate 141 tightly against the inner wall of the horizontal support beam 4 or the vertical support beam 5, thereby reliably protecting the horizontal support beam 4 and the vertical support beam 5.

[0034] In this embodiment, the metal reducing property of the U-shaped anode plate 141 is greater than the metal reducing property of the transverse support beam 4 and the vertical support beam 5. Such a design can protect the safety of the transverse support beam 4 and the vertical support beam 5 by sacrificing the U-shaped anode plate 141. The U-shaped anode plate 141 is small in size, has a low replacement cost, and is simple and convenient to replace.

[0035] Further, such as Figure 4-Figure 6 As shown, a telescopic plate 143 is sandwiched between the extrusion frame 144 and the inner wall of the U-shaped anode plate 141, and the telescopic plate 143 is made of rubber. The extrusion frame 144 and the U-shaped anode plate 141 squeeze the telescopic plate 143, which can cause the thickness of the telescopic plate 143 to decrease. This design can enhance the close fit between the U-shaped anode plate 141 and the inner wall of the horizontal support beam 4 or the vertical support beam 5, and ensure that the U-shaped anode plate 141 is reliably connected to the horizontal support beam 4 or the vertical support beam 5 to form a primary battery, thereby realizing long-term protection of the safety of the horizontal support beam 4 and the vertical support beam 5.

[0036] Furthermore, in the present embodiment, the two ends of the U-shaped anode plate 141 that are in contact with the inner wall of the transverse support beam 4 or the vertical support beam 5 are folded outward from the U-shaped anode plate 141 to form a bending edge 142, and the bending edge 142 is in close contact with the lower surface of the transverse support beam 4 or the vertical support beam 5. This design facilitates the quick installation of the U-shaped anode plate 141 into place when installing the U-shaped anode plate 141.

[0037] Further, such as Figure 5 As shown, along the width direction of the telescopic plate 143, the thickness of the telescopic plate 143 gradually decreases. Such a design can realize that when the U-shaped anode plate 141 is extended into the cavity 16 or the cavity 2 18, the telescopic plate 143 is driven to smoothly enter the cavity 16 or the cavity 2 18 and is clamped by the extrusion frame 144 and the inner wall of the U-shaped anode plate 141, which facilitates the installation of the telescopic plate 143.

[0038] In this embodiment, if Figure 2 and Figure 3As shown, a diagonal bracing beam 6 is embedded in the load-bearing wall 1, and the upper and lower ends of the diagonal bracing beam 6 are fixedly connected to the horizontal supporting beam 4 and the vertical supporting beam 5 respectively. This design further enhances the mechanical strength of the cantilever supporting device of the roof truss of the fourth-generation residential building of this embodiment, so that it can stably and reliably support the cantilever plate 2 of the roof truss of the fourth-generation residential building.

[0039] In this embodiment, if Figure 3 As shown, a through hole 17 is provided on the upper surface of the transverse support beam 4, and the lower end of the water supply and drainage pipe 9 passes through the through hole 17 and extends into the transverse support beam 4.

[0040] It can be seen that the fourth-generation residential building roof truss cantilever support device of the present embodiment adopts a hidden design. By placing the support beam into the cantilever and the interior of the building roof truss outer wall, it is suitable for terraces with large cantilever length and width. At the same time, the downpipe and the connecting pipe can be arranged in the support beam, which is both beautiful and convenient for daily maintenance. In addition, the support beam of the fourth-generation residential building roof truss cantilever support device of the present embodiment is provided with a sacrificial anode 14. The sacrificial anode 14 protects the support beam from rusting, thereby achieving long-term, reliable and stable support of the cantilever structure. At the same time, maintenance ports are reserved on the cantilever and the outer wall of the building roof truss, so that the disassembly and assembly of the sacrificial anode 14 is simple, convenient and quick.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The fourth generation of residential building roof truss cantilever support device is characterized by: include: A transverse support beam is horizontally buried in the cantilever plate, one end of the transverse support beam extends into the load-bearing wall and is fixedly connected to the steel cage in the load-bearing wall, a cavity 1 is defined in the transverse support beam, a connecting pipe is installed in the cavity 1, a drainage pipe 1 is arranged in the cantilever plate, the upper end of the drainage pipe 1 is connected to a floor drain arranged on the upper surface of the cantilever plate, and the lower end of the drainage pipe 1 extends into the cavity 1 and is connected to one end of the connecting pipe; The vertical support beam is vertically buried in the load-bearing wall and is fixedly connected to the steel cage and the horizontal support beam in the load-bearing wall. Cavity 2 is defined in the vertical support beam, and Cavity 2 is connected to Cavity 1. A vertically extending drainage pipe 2 is arranged in Cavity 2, and Drainage pipe 2 passes through Cavity 1 and is connected to the other end of the connecting pipe.

2. The fourth generation residential building roof truss cantilever support device as claimed in claim 1, characterized in that: The lower end of the drainage pipe 1 extends into the cavity 1 and is connected with the connecting pipe through the water trap.

3. The fourth generation residential building roof truss cantilever support device as claimed in claim 1, characterized in that: The lower surface of the cantilever plate is provided with an inspection port 1 connected to the cavity 1, and the inspection port 1 is close to the connecting pipe and the drain pipe 1; The second drainage pipe is provided with an inspection pipe, and the outer wall of the load-bearing wall is provided with a second inspection port connected with the second cavity, and the second inspection port is close to the inspection pipe; The inspection opening 1 and the inspection opening 2 are both provided with sacrificial anodes. The sacrificial anode in the inspection opening 1 is detachably arranged in close contact with the horizontal support beam, and the sacrificial anode in the inspection opening 2 is detachably arranged in close contact with the vertical support beam.

4. The fourth generation residential building roof truss cantilever support device as claimed in claim 3, characterized in that: Both the inspection opening 1 and the inspection opening 2 are detachably connected with decorative cover plates. The decorative cover plate in the inspection opening 1 is flush with the lower surface of the cantilever plate, and the decorative cover plate in the inspection opening 2 is vertically aligned with the outer wall of the load-bearing wall.

5. The fourth generation residential building roof truss cantilever support device as claimed in claim 3, characterized in that: The sacrificial anode comprises a U-shaped anode plate and an extrusion frame, wherein the U-shaped anode plate can be inserted into the first cavity or the second cavity and closely attached to the inner wall of the horizontal support beam or the vertical support beam, and the extrusion frame can be detachably inserted into the U-shaped anode plate and cooperate with the horizontal support beam or the vertical support beam to clamp and fix the U-shaped anode plate; The metal reducing property of the U-shaped anode plate is greater than the metal reducing property of the horizontal support beam and the vertical support beam.

6. The fourth generation residential building roof truss cantilever support device as claimed in claim 5, characterized in that: A telescopic plate is sandwiched between the extrusion frame and the inner wall of the U-shaped anode plate. The extrusion frame and the U-shaped anode plate compress the telescopic plate to reduce the thickness of the telescopic plate.

7. The fourth generation residential building roof truss cantilever support device as claimed in claim 5, characterized in that: The two ends of the U-shaped anode plate in contact with the inner wall of the horizontal support beam or the vertical support beam are folded outwards of the U-shaped anode plate to form a bending edge, and the bending edge is in close contact with the lower surface of the horizontal support beam or the vertical support beam.

8. The fourth generation residential building roof truss cantilever support device as claimed in claim 1, characterized in that: An oblique bracing beam is embedded in the load-bearing wall, and the upper and lower ends of the oblique bracing beam are respectively fixedly connected to the horizontal supporting beam and the vertical supporting beam.

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