Expansion joint structure of metal roof

Abstract

The utility model relates to an expansion joint structure of a metal roof. The expansion joint structure comprises a first supporting unit, a first roof unit, a first sealing unit, a second supporting unit, a second roof unit, a flashing unit and a second sealing unit. The first supporting unit is arranged at the top of the steel structure; the first roof unit is arranged at the top of the first supporting unit; the first sealing unit is arranged at the end part of the first roof unit; the second supporting unit is arranged at the top of the steel structure, and the top surface of the second supporting unit is higher than the top surface of the first supporting unit; the second roof unit is arranged at the top of the second supporting unit; the flashing unit is arranged between the first roof unit and the second roof unit; the second sealing unit is arranged between the flashing unit and the second roof unit. The roof panel has the advantages that the step-shaped flashing unit with the height difference is arranged between the first supporting unit and the second supporting unit, and the problem that rainwater easily permeates due to the fact that the roof panel is connected in a lap joint mode is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to an expansion joint structure for a metal roof. Background Art

[0002] Due to its advantages such as high strength, light weight, fast construction speed, and good seismic performance, steel structures are widely used in industrial factory buildings with large spans and large spaces.

[0003] The ultra-long metal roof used in conjunction with the steel structure only adopts the form of segmented staggered lapping. In areas with large temperature differences between day and night, the metal roof will expand and contract thermally, resulting in displacement between the frameworks, thereby damaging the waterproof function of the roof waterproof joints and causing roof leakage; at the same time, the thermal expansion and contraction amount of the metal roof cannot be effectively released, which will affect the service life of the metal roof.

[0004] Currently, in view of the problem that rainwater easily penetrates when the roof panels are connected in a lapping manner in the related art, no effective solution has been proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide an expansion joint structure for a metal roof to solve the problem that rainwater easily penetrates when the roof panels are connected in a lapping manner in the related art in view of the deficiencies in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An expansion joint structure for a metal roof, comprising:

[0008] A first support unit, which is arranged on the top of the steel structure;

[0009] A first roof unit, which is arranged on the top of the first support unit, and the axial direction of the first roof unit is perpendicular to the axial direction of the first support unit;

[0010] A first sealing unit, which is arranged at the end of the first roof unit and is respectively connected to the first roof unit and the first support unit for sealing the gap at the end of the first roof unit;

[0011] A second support unit, which is arranged on the top of the steel structure, and the top surface of the second support unit is higher than the top surface of the first support unit;

[0012] The second roofing unit, which is arranged on top of the second support unit. The axial direction of the second roofing unit is perpendicular to the axial direction of the second support unit. When observed from a top-down perspective, the edge of the second roofing unit overlaps with the edge of the first roofing unit;

[0013] The flashing unit, which is arranged between the first roofing unit and the second roofing unit. The first end of the flashing unit is connected to the top of the first sealing unit, and the second end of the flashing unit is located between the second support unit and the second roofing unit and is connected to the second support unit. When observed from a top-down perspective, the first end of the flashing unit extends beyond the end of the second roofing unit to seal the gap between the first roofing unit and the second roofing unit;

[0014] The second sealing unit, which is arranged between the flashing unit and the second roofing unit and is connected to the second support unit to seal the gap at the end of the second roofing unit.

[0015] In some embodiments, the first support unit includes:

[0016] The first support element, which is arranged on top of the steel structure and is respectively connected to the first roofing unit and the first sealing unit. The first roofing unit is arranged on the top of the first support element, and the top surface of the first support element is lower than the top surface of the second support unit.

[0017] In some embodiments, the first roofing unit includes:

[0018] A plurality of first roofing elements, which are arranged side by side in the radial direction on top of the first support unit. The first sealing unit is arranged at the end of the first roofing element. When observed from a top-down perspective, the edge of the first roofing element overlaps with the edge of the second roofing unit;

[0019] A plurality of first installation elements, which are respectively connected to the corresponding first roofing element and the first support unit.

[0020] In some embodiments, the first sealing unit includes:

[0021] The first sealing element, which is arranged at the end of the first roofing unit and is respectively connected to the first roofing unit and the first support unit. The first end of the flashing unit is arranged on the top of the first sealing element to seal the gap at the end of the first roofing unit.

[0022] In some of these embodiments, the second support unit includes:

[0023] A second support element, the second support element is disposed on the top of the steel structure, the top surface of the second support element is disposed higher than the top surface of the first support unit, and the flashing unit and the second roofing unit are sequentially disposed on the top surface of the second support element from bottom to top.

[0024] In some of these embodiments, the second roofing unit includes:

[0025] A plurality of second roofing elements, the plurality of second roofing elements are arranged side by side in the radial direction on the top of the second support unit, the axial direction of the second roofing element is arranged perpendicular to the axial direction of the second support unit, a second sealing unit is arranged between the second roofing unit and the flashing unit, and from a top-down perspective, the edge of the second roofing unit overlaps with the edge of the first roofing unit and is not set beyond the first end of the flashing unit;

[0026] A plurality of second mounting elements, the plurality of second mounting elements are disposed on the top of the corresponding second roofing element and are connected to the second roofing element and the second support element.

[0027] In some of these embodiments, the flashing unit includes:

[0028] A first flashing element, the first flashing element is disposed between the first roofing unit and the second roofing unit and is connected to the top of the first sealing unit, and from a top-down perspective, the first end of the first waterproof element extends beyond the end of the second roofing unit;

[0029] A second flashing element, the second flashing element is disposed at the second end of the first flashing element and is located between the second support unit and the second roofing unit, and a second sealing unit is arranged between the second flashing element and the second roofing unit for closing the gap between the first roofing unit and the second roofing unit.

[0030] In some of these embodiments, the second sealing unit includes:

[0031] A plurality of second sealing elements, the plurality of second sealing elements are respectively arranged between the flashing unit and the second roofing unit and are connected to the second support unit for blocking the gap at the end of the second roofing unit.

[0032] In some of these embodiments, it further includes:

[0033] A waterproof unit, which is respectively arranged on the first roof unit and the second roof unit for waterproof sealing.

[0034] In some embodiments, the waterproof unit includes:

[0035] A first waterproof element, which is arranged on the first roof unit for waterproof sealing;

[0036] A second waterproof element, which is arranged on the second roof unit for waterproof sealing.

[0037] Adopting the above technical solutions, compared with the prior art, the utility model has the following technical effects:

[0038] For the expansion joint structure of a metal roof of the utility model, by splitting the whole metal roof panel into a first roof unit and a second roof unit in the axial direction, the amount of deformation due to thermal expansion and contraction is reduced, and the situation of roof leakage caused by the damage of the waterproof joint due to excessive deformation can be avoided; at the same time, a height difference is set between the first support unit and the second support unit, and a stepped flashing unit is arranged between the first roof unit and the second roof unit, so as to seal the gap while there is a deformation space between the first roof unit and the second roof unit, and solve the problem that rainwater easily penetrates when the roof panels are connected in a lapped manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram (I) of the expansion joint structure of a metal roof according to an embodiment of the utility model;

[0040] Figure 2 is a schematic diagram of the first support unit according to an embodiment of the utility model;

[0041] Figure 3 is a schematic diagram of the first roof unit according to an embodiment of the utility model;

[0042] Figure 4 is a schematic diagram of the first sealing unit according to an embodiment of the utility model;

[0043] Figure 5 is a schematic diagram of the second support unit according to an embodiment of the utility model;

[0044] Figure 6 is a schematic diagram of the second roof unit according to an embodiment of the utility model;

[0045] Figure 7 is a schematic diagram (II) of the flashing unit according to an embodiment of the utility model;

[0046] Figure 8Schematic diagram of the second sealing unit according to an embodiment of the present utility model;

[0047] Figure 9 Schematic diagram of the waterproof unit according to an embodiment of the present utility model.

[0048] The reference numerals therein are: 10, first support unit; 11, first support element;

[0049] 20, first roofing unit; 21, first roofing element; 22, first mounting element;

[0050] 30, first sealing unit; 31, first sealing element;

[0051] 40, second support unit; 41, second support element;

[0052] 50, second roofing unit; 51, second roofing element; 52, second mounting element;

[0053] 60, flashing unit; 61, first flashing element; 62, second flashing element;

[0054] 70, second sealing unit; 71, second sealing element;

[0055] 80, waterproof unit; 81, first waterproof element; 82, second waterproof element. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0057] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0058] Next, the present utility model will be further described in conjunction with the accompanying drawings and specific embodiments, but it is not a limitation of the present utility model.

[0059] Embodiment 1

[0060] An illustrative embodiment of the present utility model, as Figure 1As shown in the figure, an expansion joint structure for a metal roof, which is used for an ultra-wide metal roof, includes a first support unit 10, a first roof unit 20, a first sealing unit 30, a second support unit 40, a second roof unit 50, a flashing unit 60 and a second sealing unit 70. Among them, the first support unit 10 is arranged on the top of the steel structure; the first roof unit 20 is arranged on the top of the first support unit 10, and the axial direction of the first roof unit 20 is perpendicular to the axial direction of the first support unit 10; the first sealing unit 30 is arranged at the end of the first roof unit 20 and is respectively connected to the first roof unit 20 and the first support unit 10, and is used to seal the gap at the end of the first roof unit 20; the second support unit 40 is arranged on the top of the steel structure, and the top surface of the second support unit 40 is higher than the top surface of the first support unit 10; the second roof unit 50 is arranged on the top of the second support unit 40, and the axial direction of the second roof unit 50 is perpendicular to the axial direction of the second support unit 40. From a top view, the edge of the second roof unit 50 overlaps with the edge of the first roof unit 20; the flashing unit 60 is arranged between the first roof unit 20 and the second roof unit 50, the first end of the flashing unit 60 is connected to the top of the first sealing unit 30, the second end of the flashing unit 60 is located between the second support unit 40 and the second roof unit 50 and is connected to the second support unit 40. From a top view, the first end of the flashing unit 60 extends beyond the end of the second roof unit 50 and is used to close the gap between the first roof unit 20 and the second roof unit 50; the second sealing unit 70 is arranged between the flashing unit 60 and the second roof unit 50 and is connected to the second support unit 40, and is used to seal the gap at the end of the second roof unit 50.

[0061] As Figure 2 shown in the figure, the first support unit 10 includes a first support element 11. Among them, the first support element 11 is arranged on the top of the steel structure and is respectively connected to the first roof unit 20 and the first sealing unit 30. The first roof unit 20 is arranged on the top of the first support element 11, and the top surface of the first support element 11 is lower than the top surface of the second support unit 40.

[0062] In some embodiments, the connection mode between the first support element 11 and the steel structure is welding.

[0063] In some embodiments, the cross-section of the first support element 11 includes but is not limited to Z-shaped, I-shaped, etc.

[0064] In some embodiments, the first support element 11 is a steel purlin.

[0065] As Figure 3As shown, the first roofing unit 20 includes a plurality of first roofing elements 21 and a plurality of first mounting elements 22. Among them, the plurality of first roofing elements 21 are arranged side by side in the radial direction on the top of the first support unit 10. A first sealing unit 30 is provided at the end of the first roofing element 21. From a top-down perspective, the edge of the first roofing element 21 overlaps with the edge of the second roofing unit 50; the plurality of first mounting elements 22 are respectively connected to the corresponding first roofing elements 21 and the first support unit 10.

[0066] Specifically, the plurality of first roofing elements 21 are arranged side by side in the axial direction of the first support element 11 on the top of the first support element 11; the plurality of first mounting elements 22 are respectively connected to the first support element 11.

[0067] In some of these embodiments, the cross-section of the first roofing element 21 is in a zigzag shape.

[0068] In some of these embodiments, the first roofing element 21 includes, but is not limited to, a self-locking steel roofing.

[0069] In some of these embodiments, the first mounting element 22 and the first support element 11 are connected by self-drilling screws.

[0070] The number of the first mounting elements 22 matches the number of the first roofing elements 21. Generally, the number of the first mounting elements 22 is equal to the number of the first roofing elements 21, that is, the first mounting elements 22 and the first roofing elements 21 are in one-to-one correspondence.

[0071] The size of the first mounting element 22 matches the size of the first roofing element 21. Generally, the axial dimension of the first mounting element 22 is smaller than the radial dimension of the first roofing element 21.

[0072] In some of these embodiments, the first mounting element 22 is a roofing panel clip.

[0073] As Figure 4 shown, the first sealing unit 30 includes a first sealing element 31. Among them, the first sealing element 31 is provided at the end of the first roofing unit 20 and is respectively connected to the first roofing unit 20 and the first support unit 10. The first end of the flashing unit 60 is provided at the top of the first sealing element 31 for sealing the gap at the end of the first roofing unit 20.

[0074] Specifically, the first sealing element 31 is provided at the end of the first roofing element 21 and is respectively connected to the first roofing element 21 and the first support element 11.

[0075] In some of these embodiments, the first sealing element 31 and the first roofing element 21 and the first support element 11 are connected by self-drilling screws.

[0076] The size of the first sealing element 31 matches the size of the first roofing element 21. Generally, the axial dimension of the first sealing element 31 is not less than the sum of the radial dimensions of a number of first roofing elements 21.

[0077] In some of these embodiments, the cross-section of the first sealing element 31 is U-shaped. Specifically, the first sealing element 31 includes a sealing top plate, sealing side plates, and a sealing bottom plate. Among them, the sealing top plate is disposed above the end of the first roofing element 21 and is connected to the first roofing element 21. The first end of the flashing unit 60 is provided at the top of the sealing top plate; the sealing side plates are disposed at the ends of the sealing top plate and are in contact with the ends of the first roofing element 21; the sealing bottom plate is disposed at the bottom of the sealing side plates and is connected to the first support element 11, and the top of the sealing bottom plate abuts against the first roofing element 21.

[0078] In some of these embodiments, the first sealing element 31 is a metal water stop strip.

[0079] As Figure 5 shown, the second support unit 40 includes a second support element 41. Among them, the second support element 41 is disposed on the top of the steel structure. The top surface of the second support element 41 is disposed higher than the top surface of the first support unit 10. The flashing unit 60 and the second roofing unit 50 are sequentially disposed on the top surface of the second support element 41 from bottom to top.

[0080] Specifically, the top surface of the second support element 41 is disposed higher than the top surface of the first support element 11.

[0081] In some of these embodiments, the connection manner between the second support element 41 and the steel structure is welding.

[0082] In some of these embodiments, the cross-section of the second support element 41 includes, but is not limited to, Z-shaped, I-shaped, etc.

[0083] In some of these embodiments, the second support element 41 is a steel purlin.

[0084] As Figure 6 shown, the second roofing unit 50 includes a number of second roofing elements 51 and a number of second mounting elements 52. Among them, a number of second roofing elements 51 are arranged side by side in the radial direction on the top of the second support unit 40. The axial direction of the second roofing elements 51 is perpendicular to the axial direction of the second support unit 40. A second sealing unit 70 is provided between the second roofing unit 50 and the flashing unit 60. From a top-down perspective, the edge of the second roofing unit 50 overlaps with the edge of the first roofing unit 20 and is set not to exceed the first end of the flashing unit 60; a number of second mounting elements 52 are disposed on the top of the corresponding second roofing elements 51 and are connected to the second roofing elements 51 and the second support element 41.

[0085] Specifically, a plurality of second roofing elements 51 are arranged side by side in the axial direction of the second support element 41 at the top of the second support element 41, and the axial direction of the second roofing element 51 is perpendicular to the axial direction of the second support element 41; a plurality of second mounting elements 52 are respectively connected to the second support element 41.

[0086] The number of the second roofing elements 51 matches the number of the first roofing elements 21. Generally, the number of the second roofing elements 51 is equal to the number of the first roofing elements 21, that is, the second roofing elements 51 and the first roofing elements 21 are in one-to-one correspondence.

[0087] The size of the second roofing elements 51 matches the size of the first roofing elements 21. Generally, the radial dimension of the second roofing elements 51 is equal to the radial dimension of the first roofing elements 21.

[0088] In some of these embodiments, the cross-section of the second roofing element 51 is in a zigzag shape.

[0089] In some of these embodiments, the second roofing element 51 includes, but is not limited to, a self-locking steel roofing.

[0090] In some of these embodiments, the second mounting element 52 and the first support element 11 are connected by self-drilling screws.

[0091] The number of the second mounting elements 52 matches the number of the second roofing elements 51. Generally, the number of the second mounting elements 52 is equal to the number of the second roofing elements 51, that is, the second mounting elements 52 and the second roofing elements 51 are in one-to-one correspondence.

[0092] The size of the second mounting elements 52 matches the size of the second roofing elements 51. Generally, the axial dimension of the second mounting elements 52 is smaller than the radial dimension of the second roofing elements 51.

[0093] In some of these embodiments, the second mounting element 52 is a roofing batten.

[0094] As Figure 7 shown, the flashing unit 60 includes a first flashing element 61 and a second flashing element 62. Among them, the first flashing element 61 is arranged between the first roofing unit 20 and the second roofing unit 50 and is connected to the top of the first sealing unit 30. From a top-down perspective, the first end of the first flashing element 61 extends beyond the end of the second roofing unit 50; the second flashing element 62 is arranged at the second end of the first flashing element 61 and is located between the second support unit 40 and the second roofing unit 50. A second sealing unit 70 is arranged between the second flashing element 62 and the second roofing unit 50 for closing the gap between the first roofing unit 20 and the second roofing unit 50.

[0095] Specifically, the first flashing element 61 is disposed between the first roofing element 21 and the second roofing element 51, and is connected to the top of the first sealing element 31. When viewed from a top-down perspective, the first end of the first flashing element 61 extends beyond the end of the second roofing element 51; the second flashing element 62 is located between the second support element 41 and the second roofing element 51.

[0096] In some of these embodiments, the first flashing element 61 is connected to the first sealing element 31 and the first roofing element 21 by self-drilling screws.

[0097] The size of the first flashing element 61 matches the size of the first roofing element 21. Generally, the axial dimension of the first flashing element 61 is equal to the sum of the radial dimensions of a plurality of first roofing elements 21.

[0098] In some of these embodiments, the cross-section of the first flashing element 61 is L-shaped.

[0099] In some of these embodiments, the first flashing element 61 is a first metal flashing plate.

[0100] In some of these embodiments, the second flashing element 62 is integrally formed with the first flashing element 61.

[0101] In some of these embodiments, the first flashing element 61 is connected to the second support element 41 and the second roofing element 51 by self-drilling screws.

[0102] The size of the second flashing element 62 matches the size of the first flashing element 61. Generally, the axial dimension of the second flashing element 62 is equal to the axial dimension of the first flashing element 61.

[0103] In some of these embodiments, the second flashing element 62 is a second flashing plate.

[0104] As Figure 8 shown, the second sealing unit 70 includes a plurality of second sealing elements 71. Among them, the plurality of second sealing elements 71 are respectively disposed between the flashing unit 60 and the second roofing unit 50, and are connected to the second support unit 40 for sealing the gap at the end of the second roofing unit 50.

[0105] Specifically, the plurality of second sealing elements 71 are respectively disposed between the second flashing element 62 and the second roofing element 51, and are connected to the second support element 41 for sealing the gap at the end of the second roofing element 51.

[0106] In some of these embodiments, the second sealing element 71 is connected to the second support element 41 by self-drilling screws.

[0107] The number of the second sealing elements 71 matches the number of the second roofing elements 51. Generally, the number of the second sealing elements 71 is equal to the number of the second roofing elements 51, that is, the second sealing elements 71 and the second roofing elements 51 are in one-to-one correspondence.

[0108] The size of the second sealing element 71 matches the size of the second supporting element 41. Generally, the thickness of the second sealing element 71 is less than the thickness of the second supporting element 41.

[0109] In some of these embodiments, the cross-section of the second sealing element 71 is trapezoidal. Specifically, the upper base and the hypotenuse of the second sealing element 71 are respectively abutted against the bottom surface of the second roofing element 51, the lower base of the second sealing element 71 is abutted against the top surface of the second flashing element 62, and is connected to the second supporting element 41.

[0110] In some of these embodiments, the second sealing element 71 is a metal inner plug.

[0111] The working principle of the present utility model is as follows:

[0112] To avoid the deformation of the whole metal roof panel due to thermal expansion and contraction, the whole metal roof is divided into a first roofing unit 20 and a second roofing unit 50;

[0113] A first flashing element 61 and a second flashing element 62 are arranged between the first roofing element 21 and the second roofing element 51. When the first roofing element 21 and the second roofing element 51 deform due to temperature changes, the first flashing element 61 and the second flashing element 62 can seal the gap within the deformation range, and at the same time can prevent liquid from penetrating into the interior of the roof through the lap joint.

[0114] The advantages of the present utility model are as follows: by splitting the whole metal roof panel into a first roofing unit and a second roofing unit in the axial direction, the amount of deformation caused by thermal expansion and contraction is reduced, and the situation of roof leakage caused by the failure of the waterproof joint due to excessive deformation can be avoided; at the same time, a height difference is set between the first supporting unit and the second supporting unit, and a stepped flashing unit is arranged between the first roofing unit and the second roofing unit, so that there is a deformation space between the first roofing unit and the second roofing unit while sealing the gap, and the problem that rainwater easily penetrates when the roof panels are connected in a lap joint manner is solved.

[0115] Embodiment 2

[0116] This embodiment is a supplementary embodiment of Embodiment 1.

[0117] The expansion joint structure of the metal roof further includes a waterproof unit 80. Among them, the waterproof unit 80 is respectively arranged on the first roofing unit 20 and the second roofing unit 50 for waterproof sealing.

[0118] Such asFigure 9 As shown, the waterproof unit 80 includes a first waterproof element 81 and a second waterproof element 82. Among them, the first waterproof element 81 is disposed on the first roof unit 20 for waterproof sealing; the second waterproof element 82 is disposed on the second roof unit 50 for waterproof sealing.

[0119] Specifically, the first waterproof element 81 is disposed between the first roof element 21 and the first mounting element 22; the second waterproof element 82 is disposed between the second roof element 51 and the second mounting element 52.

[0120] In some of these embodiments, the first waterproof element 81 includes, but is not limited to, a sealing strip.

[0121] In some of these embodiments, the second waterproof element 82 includes, but is not limited to, a sealing strip.

[0122] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A telescopic joint structure for a metal roof, which is used for an ultra-wide metal roof, is characterized in that Comprising: A first support unit, which is arranged on the top of the steel structure; A first roof unit, which is arranged on the top of the first support unit, and the axial direction of the first roof unit is perpendicular to the axial direction of the first support unit; A first sealing unit, which is arranged at the end of the first roof unit and is respectively connected to the first roof unit and the first support unit for sealing the gap at the end of the first roof unit; A second support unit, which is arranged on the top of the steel structure, and the top surface of the second support unit is higher than the top surface of the first support unit; A second roof unit, which is arranged on the top of the second support unit, and the axial direction of the second roof unit is perpendicular to the axial direction of the second support unit. When observed from a top view, the edge of the second roof unit overlaps with the edge of the first roof unit; A flashing unit, which is arranged between the first roof unit and the second roof unit. The first end of the flashing unit is connected to the top of the first sealing unit, and the second end of the flashing unit is located between the second support unit and the second roof unit and is connected to the second support unit. When observed from a top view, the first end of the flashing unit extends beyond the end of the second roof unit for closing the gap between the first roof unit and the second roof unit; A second sealing unit, which is arranged between the flashing unit and the second roof unit and is connected to the second support unit for sealing the gap at the end of the second roof unit.

2. The expansion joint structure of the metal roof according to claim 1, characterized in that, The first support unit includes: A first support element, which is arranged on the top of the steel structure and is respectively connected to the first roof unit and the first sealing unit. The first roof unit is arranged on the top of the first support element, and the top surface of the first support element is lower than the top surface of the second support unit.

3. The expansion joint structure of the metal roof according to claim 1, characterized in that, The first roof unit includes: A plurality of first roof elements, which are arranged side by side in the radial direction on the top of the first support unit. The first sealing unit is arranged at the end of the first roof element. When observed from a top view, the edge of the first roof element overlaps with the edge of the second roof unit; A plurality of first mounting elements, which are respectively connected to the corresponding first roof element and the first support unit.

4. The expansion joint structure of the metal roof according to claim 1, characterized in that, The first sealing unit includes: A first sealing element, which is arranged at the end of the first roof unit and is respectively connected to the first roof unit and the first support unit. The first end of the flashing unit is arranged on the top of the first sealing element for sealing the gap at the end of the first roof unit.

5. The expansion joint structure of the metal roof according to claim 1, characterized in that, The second support unit includes: A second support element, the second support element is disposed on the top of the steel structure, the top surface of the second support element is disposed higher than the top surface of the first support unit, and the top surface of the second support element is successively provided with the flashing unit and the second roofing unit from bottom to top.

6. The expansion joint structure of the metal roof according to claim 1, characterized in that, The second roofing unit includes: A plurality of second roofing elements, the plurality of second roofing elements are arranged side by side in the radial direction on the top of the second support unit, the axial direction of the second roofing element is perpendicular to the axial direction of the second support unit, and a second sealing unit is provided between the second roofing unit and the flashing unit. When observed from a top view, the edge of the second roofing unit overlaps with the edge of the first roofing unit and does not extend beyond the first end of the flashing unit; A plurality of second mounting elements, the plurality of second mounting elements are disposed on the top of the corresponding second roofing element and are connected to the second roofing element and the second support unit.

7. The expansion joint structure of the metal roof according to claim 1, characterized in that, The flashing unit includes: A first flashing element, the first flashing element is disposed between the first roofing unit and the second roofing unit and is connected to the top of the first sealing unit. When observed from a top view, the first end of the first flashing element extends beyond the end of the second roofing unit; A second flashing element, the second flashing element is disposed at the second end of the first flashing element and is located between the second support unit and the second roofing unit. A second sealing unit is provided between the second flashing element and the second roofing unit for closing the gap between the first roofing unit and the second roofing unit.

8. The expansion joint structure of the metal roof according to claim 1, characterized in that, The second sealing unit includes: A plurality of second sealing elements, the plurality of second sealing elements are respectively disposed between the flashing unit and the second roofing unit and are connected to the second support unit for plugging the gap at the end of the second roofing unit.

9. The expansion joint structure of the metal roof according to any one of claims 1 to 8, characterized in that, Further included is: A waterproof unit, the waterproof unit is respectively disposed on the first roofing unit and the second roofing unit for waterproof sealing.

10. The expansion joint structure of the metal roof according to claim 9, characterized in that, The waterproof unit includes: A first waterproof element, the first waterproof element is disposed on the first roofing unit for waterproof sealing; A second waterproof element, the second waterproof element is disposed on the second roofing unit for waterproof sealing.

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