Combined exhaust duct and impact resistance testing method

Abstract

The present invention discloses a combined exhaust duct, which is formed by a prefabricated thin plate and a wall body to form a closed cross-section exhaust duct. The prefabricated thin plate and the wall body are connected and fixed by a connecting assembly. The lateral support plate in the connecting assembly can improve the lateral stress state of the exhaust duct, and greatly improve the lateral impact resistance and deformation performance of the combined exhaust duct. The present invention also discloses a method for detecting impact resistance performance, which determines the tested surface and the impact point according to the cross-sectional form of the tested component, determines the positions of the top support point and the bottom support point, supports the tested surface on a supporting device with a support block and is in a horizontal state or a vertical state, and uses an impact object to vertically impact the impact point. The impact resistance performance is evaluated according to the state after the impact, and the force is applied reasonably, the specifications are comprehensive, and it is suitable for combined exhaust ducts with different cross-sectional sizes and reinforcing rib forms.

Description

Technical Field

[0001] The invention relates to an exhaust duct used in a residential kitchen or bathroom, in particular to a combined exhaust duct with a prefabricated thin-wall component as a cylinder and having a high impact resistance.

[0002] The invention also relates to a method for detecting the anti-impact performance of a combined exhaust duct, which can be used to detect and evaluate the anti-impact performance of the combined exhaust duct. Background Art

[0003] In the kitchen and bathroom of residential buildings, the exhaust duct is an essential building facility. In the current product standard "Residential Kitchen and Bathroom Smoke (Gas) Duct Products" JG / T194-2018, the exhaust duct is in the form of a closed-section integral cylinder composed of prefabricated steel wire mesh cement panels, and the cross-section is generally rectangular. Since the exhaust duct is set close to the wall in the house, the gap between the exhaust duct and the wall surface needs to be specially waterproofed and sealed. In addition, the integral exhaust duct consumes a lot of materials, the finished product is heavy, it is difficult to locate and install, and the labor intensity is high.

[0004] The National Building Standard Design Atlas "Residential Exhaust Duct (I)" (16J916-1) adds L-shaped combined exhaust duct (prefabricated thin plate with open cross section), which is suitable for installation at the inner corner of residential wall, and can be combined with existing wall to form an exhaust duct with closed cross section, so as to save materials and reduce self-weight. Although some L-shaped combined exhaust ducts have added reinforcing ribs at the edges of both wings to improve deformation and damage in transportation and installation, the ability to resist lateral impact and deformation (i.e., perpendicular to the longitudinal axis of the exhaust duct) is significantly different from that of traditional integral exhaust ducts, which is equivalent to a cantilever component supported at only one end compared to a simply supported component supported at both ends. In addition, the irregularly shaped reinforcing ribs significantly increase the investment in forming, demoulding and quality control of the exhaust duct, which seriously restricts the promotion and application of combined exhaust ducts (exhaust ducts composed of prefabricated thin plates with open cross sections and walls).

[0005] In other existing technologies, although some combined exhaust ducts adopt measures such as setting special-shaped reinforcing ribs, increasing the bonding area between the reinforcing ribs and the wall, and pasting mesh cloth at the joints to improve the exhaust duct's resistance to lateral impact and deformation, they cannot fundamentally change the stress state of the combined exhaust duct, and the cost is high and the effect is poor.

[0006] On the other hand, although combined exhaust ducts have been promoted and applied in more and more projects, there is currently no corresponding testing method for their impact resistance, which makes it difficult to accurately evaluate the quality of their products. Therefore, it is urgent to develop and formulate applicable impact resistance testing methods based on the characteristics of combined exhaust ducts. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a combined exhaust duct, in which a prefabricated thin plate and a wall are combined through a connecting component to form an exhaust duct with a closed cross-section, and the lateral support plate in the connecting component can provide effective lateral support for the prefabricated thin plate, transforming its force model from a cantilever state to a simply supported state, thereby greatly improving the ability of the combined exhaust duct to resist lateral impact and deformation.

[0008] Correspondingly, another technical problem to be solved by the present invention is to provide a method for detecting impact resistance, which can truly and accurately detect and evaluate the impact resistance of the combined exhaust duct according to the characteristics of the combined exhaust duct.

[0009] As for the combined exhaust duct, the combined exhaust duct of the present invention is formed by a prefabricated thin plate and a wall to form an exhaust channel with a closed cross-section. The prefabricated thin plate and the wall are fixedly connected by a connecting assembly, and the lateral support plate in the connecting assembly provides lateral support for the impact or deformation of the prefabricated thin plate.

[0010] Compared with the prior art, the combined exhaust duct of the present invention has the following beneficial effects: giving full play to the advantages of the combined exhaust duct in saving materials, reducing deadweight, etc.; firmly connecting and fixing with the wall through the connecting components, thereby improving the structural stability of the exhaust duct; rationally arranging the connecting components along the length direction of the exhaust duct, transforming the cantilever state into a simply supported state, greatly improving the ability to resist lateral impact and deformation; under the condition of the same impact resistance, the wall thickness of the prefabricated thin plate can be further reduced, the labor intensity can be reduced, and the construction progress can be accelerated; there is no need to set reinforcing ribs, the cross-sectional shape is simplified, and the prefabrication processing cost is reduced.

[0011] As an improvement of the combined exhaust duct of the present invention, the connection assembly is F-type, L-type, double T-type or straight-line type. Both the F-type and double T-type connection assemblies have two lateral support plates, and the prefabricated thin plate is clamped between the two lateral support plates, and lateral support can be obtained from two directions. The L-type connection assembly includes one lateral support plate, which can be applied to prefabricated thin plates with different wall thicknesses, with low accessory cost and fast installation speed. The straight-line connection assembly includes one lateral support plate, which is suitable for connection when the end of the wall is parallel to the prefabricated thin plate.

[0012] As another improvement of the combined exhaust duct of the present invention, the lateral support plate is embedded in the prefabricated thin plate. Embedding the lateral support plate in the prefabricated thin plate during the production stage can simplify the on-site construction process, ensure the installation quality, and shorten the construction period. In addition, when used with an L-shaped or straight-shaped connection component, lateral support can be provided in two directions.

[0013] As another improvement of the combined exhaust duct of the present invention, the prefabricated thin plates can be spliced ​​into L-shape, U-shape, F-shape or M-shape by splicing parts. The L-shape prefabricated thin plates are suitable for exhaust ducts with two walls and two prefabricated thin plates at the inner corner of the wall; the U-shape prefabricated thin plates are suitable for exhaust ducts with one wall and three prefabricated thin plates; the F-shape prefabricated thin plates are suitable for double-cavity exhaust ducts with two walls and two prefabricated thin plates at the inner corner of the wall; the M-shape prefabricated thin plates are suitable for double-cavity exhaust ducts with one wall and three prefabricated thin plates. By selecting different splicing forms of prefabricated thin plates according to the exhaust duct setting conditions of different houses, the advantages of the combined exhaust duct can be fully utilized.

[0014] As another improvement of the combined exhaust duct of the present invention, the splicing piece used for splicing the prefabricated thin plates is L-shaped or straight-shaped. The prefabricated thin plates with regular cross-sections (such as flat plates or L-shaped) can be spliced ​​into various special-shaped cross-sections (such as U-shaped, F-shaped or M-shaped, etc.) through the L-shaped or straight-shaped splicing piece, which can save various additional measures in the forming, demoulding, maintenance, transportation and other links of the integrated special-shaped prefabricated thin plates, thereby saving various costs.

[0015] As another improvement of the combined exhaust duct of the present invention, the prefabricated thin plate installed in the residence is supported by the floor slab at the reserved hole on the same floor. The traditional integral exhaust duct is installed in a stacking manner, that is, the exhaust duct on the upper floor is supported by the exhaust duct on the lower floor. Generally, a rigid support is provided at the floor slab every three floors, which is equivalent to supporting three sections (layers) of exhaust duct in series as a whole on a certain floor slab. This approach has high requirements on the vertical bearing capacity and installation size deviation of the exhaust duct, and when local maintenance and replacement are carried out in the later stage, adjacent floors are often involved. Supporting each section (layer) of the exhaust duct on the floor slab at the reserved hole on the same floor not only solves the above-mentioned shortcomings, but also eliminates the processing work of the gap between the reserved hole on the floor slab and the outer wall of the exhaust duct in the traditional installation method (supporting the formwork, grouting the seam, removing the formwork, etc.), saving time and labor.

[0016] As for the impact resistance testing method, the impact resistance testing method of the present invention includes the following steps: a. determining the tested surface and the impact point according to the cross-sectional form of the tested component; b. determining the position of the top support point on the tested surface, and determining the position of the bottom support point on the non-tested surface; c. supporting the tested surface on a support device with support blocks, each support point is supported on a support block, and the positions of the tested component, the support device and the support blocks are adjusted so that the tested surface is horizontal or vertical under the action of gravity and the supporting force, and is not affected by other external forces such as wind, rain, vibration, etc.; d. vertically impacting the impact point with an impact object of a certain weight at a certain speed and a certain number of times; e. evaluating the test results of the impact resistance according to the state after the impact and according to predetermined rules.

[0017] In the prior art, there are only normative requirements for the testing method of the impact resistance (resistance to soft object impact) of the integral exhaust duct and the corresponding supporting device, such as Article 7.4 of "Residential Kitchen and Bathroom Smoke (Gas) Duct Products" JG / T194-2018, but there is no public technical achievement for the combined exhaust duct. The impact resistance testing method of the present invention has the following beneficial effects: it provides the requirements for the impact resistance testing method and the supporting device, the method has reasonable force application, the steps are standardized and comprehensive, the device is flexible to adjust, and it can be applied to combined exhaust ducts with different cross-sectional sizes and reinforcing rib forms.

[0018] As an improvement of the impact resistance testing method of the present invention, the top support point is located at the edge of the tested surface away from the non-tested surface, and the bottom support point is located at the edge of the non-tested surface away from the tested surface. The top support point is located at the edge of the tested surface away from the non-tested surface, which can increase the range of the tested surface to freely withstand the impact and fully reflect the impact resistance of the tested component; the bottom support point is located at the edge of the non-tested surface away from the tested surface, which can facilitate the arrangement of the support block.

[0019] As another improvement of the impact resistance testing method of the present invention, the top support point includes a first top support point and a second top support point, and the bottom support point includes a first bottom support point and a second bottom support point. The number of the top support points and the number of the bottom support points are both 2. This force model is concise and reasonable, which can fully reflect the impact resistance of the tested component and simplify the requirements for the support device.

[0020] As another improvement of the impact resistance test method of the present invention, the top support point or the bottom support point can be connected to the support block through a connecting assembly. For a combined exhaust duct equipped with a lateral support plate (especially a lateral support plate that can provide bidirectional support), the support block is connected to the lateral support plate through a connecting assembly to simulate the actual installation method. In this state, the impact resistance test is performed, which can make the test result more real and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic plan view of a first embodiment of the combined exhaust duct of the present invention;

[0023] Figure 2 is a top view of an F-type connection assembly of a combined exhaust duct of the present invention;

[0024] Figure 3 It is a front view of the F-type connection assembly of the combined exhaust duct of the present invention;

[0025] Figure 4 is a side view of an F-type connection assembly of a combined exhaust duct of the present invention;

[0026] Figure 5 It is a schematic diagram of the installation of the first embodiment of the combined exhaust duct of the present invention;

[0027] Figure 6 is a schematic plan view of a second embodiment of the combined exhaust duct of the present invention;

[0028] Figure 7 is a schematic plan view of a third embodiment of the combined exhaust duct of the present invention;

[0029] Figure 8 is a schematic plan view of a fourth embodiment of the combined exhaust duct of the present invention;

[0030] Fig. 9 is a schematic diagram of a floor slab cross section of a fourth embodiment of the combined exhaust duct of the present invention;

[0031] Fig.10 is a schematic plan view of a fifth embodiment of the combined exhaust duct of the present invention;

[0032] Fig.11 is a schematic plan view of a sixth embodiment of the combined exhaust duct of the present invention;

[0033] Fig.12 This is a front view of the traditional method for testing the impact resistance of an integral exhaust duct;

[0034] Fig.13 It is a side view of the traditional method for testing the impact resistance of the integral exhaust duct;

[0035] Fig.14 It is a side view of a first embodiment of the impact resistance testing method of the present invention;

[0036] Fig.15 It is a front view of a supporting device of a first embodiment of the impact resistance testing method of the present invention;

[0037] Fig.16 It is a side view of a second embodiment of the impact resistance testing method of the present invention;

[0038] Fig.17 It is a top view of a second embodiment of the impact resistance testing method of the present invention;

[0039] Fig.18 It is a side view of a third embodiment of the impact resistance testing method of the present invention.

[0040] Among them: 1. Wall, 2. Reserved opening, 3. Floor, 4. Prefabricated thin plate, 5. Exhaust port, 6. F-type connection assembly, 7. F-type clamp, 8. Expansion bolt, 9. Fastening bolt, 10. L-type connection piece, 11. Embedded lateral support plate, 12. Double T-type connection assembly, 13. T-type seal, 14. L-type splicing piece, 15. I-type connection assembly, 16. I-type splicing piece, 17. Integral exhaust duct, 18. Wooden edge, 19. Sandbag, 20. Base, 21. Vertical pole, 22. Support block, 23. Diagonal brace, 24. Horizontal brace, 25. Support rod, 26. Steel ball, 27. Nylon rope. DETAILED DESCRIPTION

[0041] The combined exhaust duct and impact resistance testing method of the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to more clearly understand the structural composition, installation method and procedural steps of the present invention, but this cannot be used to limit the scope of protection of the present invention.

[0042] The first embodiment of the combined exhaust duct of the present invention is as follows Figures 1 to 5 As shown. The reserved hole 2 for installing the exhaust duct is set at the inner corner of the wall 1. The prefabricated thin plate 4 is L-shaped. The raw materials required for its production include cementitious materials (such as cement, fly ash), reinforcing materials (such as wire mesh, alkali-resistant mesh, inorganic fiber), aggregates (such as sand, ceramsite, industrial waste residue, tailings powder) and water. It is prefabricated and produced by the factory and transported to the project site. The prefabricated thin plate 4 is connected and fixed to the wall 1 by an F-type connection component 6. The F-type connection component 6 consists of an F-type fixture 7, an expansion bolt 8, and a fastening bolt 9. First, holes are punched at appropriate positions on the edge of the prefabricated thin plate 4 (3 holes are set along the height direction of each joint, for a total of 6 holes), and 6 F-type fixtures 7 are fixed to the 6 openings of the prefabricated thin plate 4 with fastening bolts 9 respectively. Then, the L-shaped prefabricated thin plate 4 is placed at the inner corner of the wall 1 according to the design requirements, and the F-type fixture 7 is fixed to the wall 1 with expansion bolts 8, thus completing the assembly and fixing of the L-shaped prefabricated thin plate. Then, the joints are sealed with polymer mortar, and the corresponding interface components (pipes, valves, diversion devices, etc.) are installed at the exhaust port 5.

[0043] In this embodiment, each F-type fixture 7 has two lateral support plates, which can provide support for the prefabricated thin plate 4 in two directions, thereby greatly improving the lateral impact resistance and deformation performance of the exhaust duct.

[0044] The second embodiment of the combined exhaust duct of the present invention is as follows Figure 6As shown. The reserved hole 2 for installing the exhaust duct is set at the inner corner of the wall 1. The prefabricated flat plate containing the embedded lateral support plate 11 is prefabricated and produced by the factory and transported to the project site. The two prefabricated flat plates are spliced ​​into an L-shaped prefabricated thin plate 4 through the L-shaped splicing piece 14, the fastening bolts 9 and the embedded parts at the splicing (the L-shaped splicing piece and the embedded parts are both provided with screw holes corresponding to the fastening bolts). The L-shaped prefabricated thin plate 4 is connected and fixed to the wall 1 by an L-shaped connecting assembly. The L-shaped connecting assembly consists of an L-shaped connecting piece 10, an expansion bolt 8, a fastening bolt 9 and an embedded lateral support plate 11. First, fix the L-shaped connector 10 to the embedded lateral support plate 11 of the prefabricated thin plate 4 with fastening bolts 9 (both the L-shaped connector and the embedded lateral support plate are provided with screw holes corresponding to the fastening bolts), then according to the design requirements, put the L-shaped prefabricated thin plate 4 in place at the inner corner of the wall 1, and fix the L-shaped connector 10 to the wall 1 with expansion bolts 8, thus completing the assembly and fixation of the L-shaped prefabricated thin plate.

[0045] In this embodiment, the embedded parts for splicing two prefabricated flat panels can be made separately according to the specific situation, and can also be replaced by embedded lateral support plates to simplify the types of accessories. In addition, in order to facilitate installation operation or later maintenance, the L-shaped splicing parts for splicing two prefabricated flat panels can also be arranged at the outer corner of the splicing.

[0046] The third embodiment of the combined exhaust duct of the present invention is as follows Figure 7 As shown. The L-shaped prefabricated sheet 4 is positioned with the wall 1 by an L-shaped connection assembly. The L-shaped connection assembly consists of an L-shaped connector 10 and an expansion bolt 8. The side of the L-shaped connector 10 that contacts the L-shaped prefabricated sheet 4 also serves as a lateral support plate. First, the L-shaped connector 10 is fixed to the wall 1 with the expansion bolt 8 according to the position required by the design. Then, the L-shaped prefabricated sheet 4 is placed close to the L-shaped connector 10, and each joint is densely coated with an adhesive sealing material, and the assembly and fixing of the L-shaped prefabricated sheet is completed.

[0047] In this embodiment, the L-shaped connector 10 only provides lateral support to the exhaust duct in one direction, i.e., inward. For the outward direction, it can be improved by adding multiple hoops along the longitudinal direction of the outer wall of the exhaust duct (the two ends of the hoops are fixed on the wall), adding adhesive materials on the joint surface, or laying mesh cloth at the joint.

[0048] A fourth embodiment of the combined exhaust duct of the present invention is as follows Figure 8As shown. The reserved hole 2 for installing the exhaust duct is set close to the wall 1. The prefabricated thin plate 4 is U-shaped, prefabricated and produced by the factory and transported to the project site. The prefabricated thin plate 4 is connected and fixed to the wall 1 with a double T-shaped connection component 12. The double T-shaped connection component 12 consists of a double T-shaped fixture, an expansion bolt 8, and a fastening bolt 9. First, fix the double T-shaped fixture to the wall 1 with the expansion bolt 8 according to the installation position required by the design, then insert the edge of the prefabricated thin plate 4 into the double T-shaped fixture and fix it with the fastening bolt 9 (the double T-shaped fixture and the prefabricated thin plate are provided with screw holes corresponding to the fastening bolts), then fill the gap between the prefabricated thin plate 4 and the double T-shaped fixture with caulking material, and then seal each joint with polymer mortar to complete the assembly and fixation of the U-shaped prefabricated thin plate.

[0049] In this embodiment, the exhaust duct is not installed in a traditional stacking manner, but the U-shaped prefabricated thin plate is supported on the floor at the edge of the reserved hole on the same floor. In order to prevent the sealing defects on the horizontal joint surface between the prefabricated thin plate 4 and the floor 3 from causing smoke leakage, such as Fig. 9 As shown, a T-shaped seal 13 is added at the joint surface (the top and bottom of each floor slab), and then the seam is sealed with inorganic sealing materials, which can effectively prevent smoke leakage and ensure the construction quality. In addition, the U-shaped prefabricated thin plate can also be spliced ​​by one L-shaped prefabricated thin plate and one prefabricated flat plate or three prefabricated flat plates.

[0050] A fifth embodiment of the combined exhaust duct of the present invention is as follows Fig.10As shown. The reserved hole 2 for installing the exhaust duct is set at the inner corner of the wall 1, and the width of the exhaust duct is equal to the length of the wall at that location (that is, the outer edges of the two are flush). The cross-section of the exhaust duct is a double cavity, which is spliced ​​by two L-shaped prefabricated thin plates 4, and each L-shaped prefabricated thin plate has a pre-embedded lateral support plate 11. According to the aforementioned method, one side of the first L-shaped prefabricated thin plate is fixed to the wall on the same side with an L-shaped connection component, and the other side is fixed to the wall on the other side with a straight-line connection component 15. The straight-line connection component 15 is composed of a straight-line connection plate, an expansion bolt 8, a fastening bolt 9, and a pre-embedded lateral support plate 11. First, fix the I-shaped connecting plate to the embedded lateral support plate 11 of the first L-shaped prefabricated thin plate with fastening bolts 9 (both the I-shaped connecting plate and the embedded lateral support plate are provided with screw holes corresponding to the fastening bolts), and then fix the I-shaped connecting plate to the wall 1 with expansion bolts 8, thus completing the assembly and fixation of the first L-shaped prefabricated thin plate. According to the aforementioned method, one side of the second L-shaped prefabricated thin plate is fixed to the wall on the same side with an L-shaped connecting assembly, and the other side is spliced ​​with the corner of the first L-shaped prefabricated thin plate. The splicing of the two L-shaped prefabricated thin plates is completed by the I-shaped splicing piece 16, the embedded piece at the corner of the first L-shaped prefabricated thin plate, the embedded piece at the edge of the second L-shaped prefabricated thin plate, and two fastening bolts 9 (both the I-shaped splicing piece and the embedded piece are provided with screw holes corresponding to the fastening bolts). Each splicing seam is sealed with polymer mortar, thus completing the assembly and fixation of the F-shaped prefabricated thin plate.

[0051] In this embodiment, the F-shaped prefabricated thin plate is formed by splicing two L-shaped prefabricated thin plates, and can also be realized by splicing one U-shaped prefabricated thin plate and one prefabricated flat plate or one L-shaped prefabricated thin plate and two prefabricated flat plates.

[0052] A sixth embodiment of the combined exhaust duct of the present invention is as follows Fig.11 As shown. The reserved hole 2 for installing the exhaust duct is set close to the wall 1. The cross-section of the exhaust duct is a double cavity, which is spliced ​​by a U-shaped prefabricated thin plate and an L-shaped prefabricated thin plate. The connection between the U-shaped prefabricated thin plate and the L-shaped prefabricated thin plate and the wall 1 is pre-embedded with a lateral support plate 11. According to the above method, the U-shaped prefabricated thin plate and the L-shaped prefabricated thin plate are fixed to the wall 1 with an L-shaped connection assembly. After that, the corner of the U-shaped prefabricated thin plate is spliced ​​with one side of the L-shaped prefabricated thin plate through a straight-line splicing piece 16, an embedded part at the corner of the U-shaped prefabricated thin plate, an embedded part at the edge of the L-shaped prefabricated thin plate, and two fastening bolts 9 (the straight-line splicing piece and the embedded part are provided with screw holes corresponding to the fastening bolts). Each joint is sealed with polymer mortar to complete the assembly and fixation of the M-shaped prefabricated thin plate.

[0053] In this embodiment, the M-shaped prefabricated thin plate is formed by splicing one U-shaped prefabricated thin plate and one L-shaped prefabricated thin plate, and can also be realized by splicing a prefabricated flat plate, an L-shaped prefabricated thin plate and a U-shaped prefabricated thin plate in other combinations.

[0054] "Residential Kitchen and Bathroom Smoke (Gas) Duct Products" JG / T194-2018 provides the traditional integral exhaust duct impact resistance test method in Article 7.4, such as Fig.12 and Fig.13 As shown. The rectangular cross-section integral exhaust duct 17 is horizontally supported on wooden edges 18 with a spacing of 1.8m (the cross-section size of the wooden edges is 50mm×50mm), and a 10kg sandbag 19 is used to impact the center of the upper surface of the integral exhaust duct 17 from a height of 1m. Repeat the above impact process for a total of 5 impacts, and evaluate the impact resistance of the integral exhaust duct 17 according to the surface cracking. If the surface is not cracked, it is evaluated as qualified, otherwise it is unqualified.

[0055] The first implementation method of the impact performance testing method of the present invention is as follows Fig.14 and Fig.15 As shown. The prefabricated thin plate 4 is L-shaped, and its two sides are of unequal length. Under the same wall thickness conditions, the impact resistance of the long side is relatively weak, so the long side is taken as the tested surface, and the center point of the tested surface is taken as the impact point. With the impact point as the center, two top support points (the first top support point and the second top support point) are determined at the edge of the tested surface away from the non-tested surface, and the distance between the two top support points is 1.8m; two bottom support points (the first bottom support point and the second bottom support point) are determined at the edge of the non-tested surface away from the tested surface, and the positions of the two bottom support points correspond to the two top support points, and the distance between them is also 1.8m.

[0056] The support device is an integral type, that is, two vertical poles 21 (1.8m apart) are fixed on the base 20. Vertical holes are opened on the vertical poles 21, and the L-shaped support block 22 is connected to the vertical poles 21 by bolts, and its height can be adjusted up and down through the holes. A diagonal brace 23 is also provided between the vertical poles 21 and the base 20, and a transverse brace 24 is also provided between the two vertical poles 21. The diagonal brace 23 and the transverse brace 24 are used to increase the stability of the vertical poles 21.

[0057] When testing the impact resistance, the non-tested surface of the L-shaped prefabricated sheet 4 is supported on two wooden edges 21 (the first bottom support block and the second bottom support block) with a spacing of 1.8m. The height of the two support blocks 22 (the first top support block and the second top support block) with a spacing of 1.8m is adjusted so that the tested surface of the L-shaped prefabricated sheet 4 is horizontally placed on the L-shaped support block 22 without any other external force. The positions of the two support blocks 22 correspond to the positions of the two wooden edges 21 and meet the above requirements. Use a 10kg sandbag 19 to impact the impact point vertically downward from a height of 1m. Repeat the above impact process for a total of 5 impacts, and evaluate the impact resistance of the L-shaped prefabricated sheet 4 based on the surface cracking. If the outer surface is not cracked, it is evaluated as qualified, otherwise it is unqualified.

[0058] The second implementation method of the impact resistance testing method of the present invention is as follows Fig.16 and Fig.17 As shown. The prefabricated thin plate 4 is L-shaped, with both sides of equal length and both with oblique reinforcement ribs. Each side is provided with three lateral support plates at the edge: one at the midpoint and one at 1m on both sides of the midpoint, that is, the spacing between the lateral support plates at both ends is 2m. Take any side as the tested surface, and take the center point of the tested surface as the impact point. The three lateral support plates at the edge of the tested surface are the top support points (3 in total); the three lateral support plates at the edge of the non-tested surface are the bottom support points (3 in total), and the positions of the three bottom support points correspond to the three top support points.

[0059] The support device is split, that is, only one vertical pole 21 is fixed on each base 20. A vertical hole is opened on the vertical pole 21, and a rod-shaped support block 22 with a thread is connected to the vertical pole 21 and its height can be adjusted up and down through the hole. Two inclined rods 23 are also provided between each vertical pole 21 and the base 20 to increase the stability of the vertical pole 21.

[0060] When testing the impact resistance, support the non-tested surface of the L-shaped prefabricated sheet 4 on three wooden edges 21 with adjusted distances, and adjust the heights of the three support blocks 22 so that the tested surface of the L-shaped prefabricated sheet 4 is horizontally placed on the rod-shaped support blocks 22 without any other external effects. The positions of the three support blocks 22 correspond to the positions of the three wooden edges 21 and meet the above requirements. Use a 10kg cylindrical sandbag 19 (sandbag diameter 200mm, bottom arc height 30mm) to impact the impact point vertically downward from a height of 1m. Repeat the above impact process for a total of 5 impacts, and evaluate the impact resistance of the L-shaped prefabricated sheet 4 based on the surface cracking. If there is no cracking on both the inner and outer surfaces, it is evaluated as qualified, otherwise it is unqualified.

[0061] In this embodiment, based on the primary and secondary factors affecting the impact resistance, although the L-shaped prefabricated thin plate is provided with 6 lateral support plates, only the 3 lateral support plates of the tested surface are connected and fixed with the top support block in a simulated actual installation manner, so that these 3 places can provide lateral support in two directions for the tested component, and the wooden edge is still used as a unidirectional support for the non-tested surface. If a more accurate evaluation is required, the lateral support plates of the non-tested surface can also be connected and fixed with the bottom support block in a simulated actual installation manner.

[0062] The third implementation method of the impact performance testing method of the present invention is as follows Fig.18As shown. The prefabricated thin plate 4 is U-shaped (two flanges and one web), and two lateral support plates arranged symmetrically in the longitudinal direction are provided at the edge of each flange, and the spacing between the two lateral support plates is 1.5m. Any flange is taken as the tested surface, and the web is the non-tested surface. The center point of the tested flange is taken as the impact point, the two lateral support plates of the tested flange are the top support points, and the edge of the web away from the tested flange is taken as the two bottom support points. The positions of the two bottom support points correspond to the two top support points, and the spacing is also 1.5m.

[0063] The supporting device is an integral type, that is, two vertical poles 21 (1.5m apart) are fixed on the base 20. The vertical poles 21 are provided with vertical holes, one end of the support rod 26 is connected to the vertical pole 21 by bolts and its height can be adjusted up and down through the holes, and the other end of the support rod 26 is provided with an L-shaped support block 22.

[0064] During the impact resistance test, the web of the U-shaped prefabricated sheet 4 is placed horizontally and laterally supported on two wooden edges 21 (the first bottom support point and the second bottom support point) with a spacing of 1.5m. The height of the two support rods 26 with a spacing of 1.5m is adjusted, and the L-shaped support block 22 is connected and fixed to the lateral support plate embedded in the tested flange of the U-shaped prefabricated sheet 4 through a connecting assembly (the connecting assembly includes fastening bolts 9), so that the tested surface of the U-shaped prefabricated sheet 4 is in a vertical state, and the positions of the two support blocks 22 correspond to the positions of the two wooden edges 21 and meet the above requirements. A 5kg steel ball 26 is suspended vertically with a 1.2m long nylon rope 27 near the impact point. After confirming that there is no wind, vibration or other external forces, the steel ball 26 is pulled outward vertically and perpendicular to the tested surface by hand (the nylon rope 27 is kept taut) until the vertical height difference of the steel ball 26 from the initial state reaches 0.5m, and the steel ball 26 is released to swing freely to impact the impact point. Repeat the above impact process for a total of 3 impacts, and evaluate the impact resistance of the U-shaped prefabricated sheet 4 according to the surface cracking. If there is no cracking on both the inner and outer surfaces, it is evaluated as qualified, otherwise it is unqualified.

[0065] In addition to the above-mentioned embodiments and usage descriptions, the combined exhaust duct and impact resistance performance testing method of the present invention also have other similar structural composition forms or procedural steps, which can also achieve the purpose of the present invention. For example, the lateral support plate can also be rod-shaped or tubular; the L-shaped splicing piece used for splicing prefabricated flat plates can also be used at the outer corner; the bolt connection between each connecting component can also be changed to welding; the opening at the edge of the prefabricated thin plate connected to the connecting component (including when the impact resistance performance is tested) can also be reserved in the production stage, and the opening or the embedded lateral support plate can be equipped with reinforcing ribs; the T-shaped seal can also be replaced with other forms, or only set at the top or bottom of the floor; the difference in changes in other properties before and after the impact can also be used as the evaluation result of the impact resistance. Moreover, the relevant accessories can also be used for the splicing and installation of other types of exhaust ducts, such as two L-shaped prefabricated thin plates can be spliced ​​into a square exhaust duct through an L-shaped splicing piece. As long as the structural form or method is an obvious change and substitution for those skilled in the art, it should fall within the scope of protection of the present invention.

Claims

1. A method for detecting the impact resistance of a combined exhaust duct, the method for detecting the impact resistance of a combined exhaust duct is based on a combined exhaust duct, the combined exhaust duct comprises a prefabricated thin plate and a wall, the prefabricated thin plate and the wall together enclose an exhaust duct with a closed cross-section, and further comprises a connecting assembly for fixedly connecting the prefabricated thin plate and the wall, the connecting assembly comprises a lateral support plate, the lateral support plate provides lateral support for the impact or deformation of the prefabricated thin plate, The connecting component is F-type, L-type, double T-type or straight-line type, The lateral support plate is embedded in the prefabricated thin plate. The prefabricated thin plates are spliced ​​into L-shape, U-shape, F-shape or M-shape by splicing parts. The splicing piece is L-shaped or straight-shaped. The prefabricated thin panels installed on each floor are supported by the floor slabs at the reserved openings on the same floor. The method for testing the impact resistance of the combined exhaust duct is characterized in that: The method comprises the following steps: a. determining the tested surface and impact point of the impact resistance according to the cross-sectional form of the tested component; b. Determine the position of the top support point on the measured surface and determine the position of the bottom support point on the non-measured surface; c. Supporting the measured surface on a support device having a support block, each of the top support point and each of the bottom support point are supported on one of the support blocks, adjusting the positions of the measured member, the support device and the support block, so that the measured surface is in a horizontal state or a vertical state under the gravity of the measured member and the support force of the support block, and is not affected by other external forces; d. Impacting the impact point with an object of a certain weight at a certain speed and at an angle perpendicular to the tested surface for a certain number of times; e. According to the state of the tested component after the impact, the test results of the impact resistance performance are evaluated according to predetermined rules, The top support point is located at the edge of the tested surface away from the non-tested surface, and the bottom support point is located at the edge of the non-tested surface away from the tested surface. The top support point includes a first top support point and a second top support point, and the bottom support point includes a first bottom support point and a second bottom support point. The top support point or the bottom support point may be connected to the support block via a connection assembly.

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