A floor slab expansion joint structure and its construction method

Abstract

This invention discloses a floor slab expansion joint structure and its construction method. The floor slab expansion joint structure includes: a first steel beam; a first L-shaped side formwork, fixedly installed on the top of the first steel beam along a first horizontal direction, suitable as a side formwork for pouring concrete for the first floor slab; a first filling structure, located on the side of the first L-shaped side formwork facing away from the first floor slab along the first horizontal direction; and a second L-shaped side formwork, located on the top of the first steel beam along the first horizontal direction and on the side of the first filling structure facing away from the first L-shaped side formwork, suitable as a side formwork for pouring concrete for the second floor slab. The second L-shaped side formwork has a first movable state that slides along a second horizontal direction and a second fixed state that is relatively fixed to the first L-shaped side formwork; the first horizontal direction is perpendicular to the second horizontal direction. This invention solves the technical problems of existing expansion joints having large widths, affecting building function and decoration, and posing a risk of water leakage.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a floor slab expansion joint structure and its construction method. Background Technology

[0002] With the development of steel structures, in addition to their widespread application in industrial plants and large-span spatial structures, steel structures are increasingly being used in residential buildings, hospitals, schools, and shopping malls. Steel structure buildings are characterized by their high load-bearing capacity and good ductility. However, due to their relatively flexible stiffness, when installing seismic expansion joints on ultra-long buildings to address temperature stress issues, wider expansion joints than those in concrete buildings are required. These expansion joints cause problems for building decoration and also encroach on more of the building's interior space.

[0003] In related technologies, the construction methods for expansion joints in steel structure buildings are as follows: when the building length slightly exceeds the length limit required by the specifications, temperature stress is generally resisted by reinforcing the floor slabs with continuous steel bars; when the building length exceeds the specifications by a large margin, the temperature stress problem is generally solved by using expansion joints that completely separate the two sides of the building. According to the "Code for Seismic Design of Building Structures", "when seismic joints are required for steel structure buildings, the joint width should not be less than 1.5 times that of the corresponding reinforced concrete structure building". For steel structure buildings with a height of 100 meters, expansion joints often need to be 400-500 mm to meet the specifications.

[0004] Therefore, the existing expansion joint structure is relatively wide, which has a significant impact on building function and decoration. In addition, there is a continuous gap in the floor slab at the expansion joint, which poses a significant risk of water leakage. Summary of the Invention

[0005] This invention provides a floor expansion joint structure and its construction method, which solves the technical problems of existing expansion joint structures having large widths, which have a significant impact on building functions and decoration, and the fact that there are continuous gaps in each floor slab at the expansion joint, which poses a significant risk of water leakage.

[0006] In view of this, the first aspect of the present invention provides a floor slab expansion joint structure, comprising:

[0007] First steel beam;

[0008] The first L-shaped side formwork is fixedly installed on the top of the first steel beam along the first horizontal direction, and is suitable as a side formwork for pouring concrete for the first floor slab.

[0009] The first filling structure has a first L-shaped side mold set along the first horizontal direction on the side opposite to the first floor slab;

[0010] The second L-shaped side mold is set on top of the first steel beam along the first horizontal direction and located on the side of the first filling structure opposite to the first L-shaped side mold. It is suitable as a side mold for pouring concrete for the second floor slab. The second L-shaped side mold has a first movable state that slides along the second horizontal direction and a second fixed state that is fixed relative to the first L-shaped side mold. The second floor slab is suitable for pouring concrete when the second L-shaped side mold is in the first fixed state.

[0011] Wherein, the first horizontal direction is perpendicular to the second horizontal direction, an expansion joint is formed between the first L-shaped side mold and the second L-shaped side mold, and both the first L-shaped side mold and the second L-shaped side mold include two straight plates connected at right angles.

[0012] Optionally, the second L-shaped side mold is connected to the first L-shaped side mold by a first bolt, the shank of the first bolt passing sequentially through the second L-shaped side mold, the first filling structure and the first L-shaped side mold along the second horizontal direction; the end of the first bolt is threadedly connected to the first nut.

[0013] The first bolt has a second movable state in which it can slide with the first L-shaped side mold when the first nut is removed, and a second fixed state in which the second L-shaped side mold and the first L-shaped side mold are fixed by connecting the first nut.

[0014] Optionally, it also includes a second filling structure, which covers one end of the first bolt that extends into the first L-shaped side mold when the first bolt is in the second active state;

[0015] And / or, a first fastener is provided in the first L-shaped edge mold along the vertical direction;

[0016] And / or, a second fastener is provided in the second L-shaped edge mold along the vertical direction;

[0017] Alternatively, the first L-shaped side mold is welded to the first steel beam.

[0018] And / or, the first L-shaped side mold and the second L-shaped side mold are both angle steel or L-shaped steel plate bending parts;

[0019] And / or, the first steel beam is an I-beam;

[0020] And / or, the first filling structure is extruded polystyrene board or foam board;

[0021] And / or, the width of the first steel beam is greater than or equal to 300 mm.

[0022] Optionally, it also includes a water-stop steel plate, which is arranged along the expansion joint; the vertical length of the first L-shaped side mold is greater than the vertical length of the second L-shaped side mold; one side of the water-stop steel plate is welded to the first L-shaped side mold, and the other side extends into one side of the second floor slab along the second horizontal direction through an extension.

[0023] Optionally, a padding layer is provided on one side of the extension.

[0024] Optionally, it also includes a connecting column, which is located on one side of the second floor slab along a second horizontal direction and connected to a second steel beam via a connecting plate. The second steel beam is adapted to support the second floor slab.

[0025] Optionally, the connecting plate is provided with a plurality of elongated holes, the length direction of which is parallel to the second horizontal direction, and the second steel beam is connected to the connecting plate by a second bolt; the second bolt passes through the second steel beam and the elongated holes in sequence, and the end of the second bolt is fixed by a second nut;

[0026] And / or, a rubber pad is provided between the second steel beam and the connecting plate;

[0027] And / or, the second steel beam is an I-beam.

[0028] A second aspect of the present invention provides a construction method for a floor slab expansion joint structure, comprising:

[0029] The first L-shaped side mold is fixedly set on the top of the first steel beam;

[0030] A first filling structure is provided on the side of the first L-shaped side mold facing the expansion joint, according to the width of the expansion joint;

[0031] A second L-shaped side mold is provided on the side of the first filling structure away from the first L-shaped side mold, and the second L-shaped side mold is connected to the first L-shaped side mold in a first fixed state;

[0032] Concrete is poured on one side of the expansion joint located at the second L-shaped side formwork to form the second floor slab;

[0033] The second L-shaped side mold is connected to the first L-shaped side mold in the first active state, and concrete is poured on the side of the expansion joint located on the first L-shaped side mold to form the first floor slab.

[0034] Optionally, the step of providing a second L-shaped side mold on the side of the first filling structure away from the first L-shaped side mold, and connecting the second L-shaped side mold to the first L-shaped side mold in a first fixed state, specifically includes:

[0035] A second L-shaped side mold is provided on the side of the first filling structure away from the first L-shaped side mold;

[0036] The second L-shaped side mold is connected to the first L-shaped side mold by a first bolt. The shank of the first bolt passes through the second L-shaped side mold, the first filling structure and the first L-shaped side mold in sequence along the second horizontal direction, and the end of the first bolt is threaded with a first nut. The first bolt is in a second fixed state.

[0037] Optionally, the step of connecting the second L-shaped side mold to the first L-shaped side mold in a first active state, and pouring concrete on the side of the expansion joint located at the first L-shaped side mold to form a first floor slab, specifically includes:

[0038] Remove the first nut from the first bolt, and cover one end of the first bolt that extends into the first L-shaped mold with the second filling structure inside the first L-shaped mold, so that the first bolt is in a second movable state.

[0039] Concrete is poured on one side of the expansion joint located at the first L-shaped side formwork to form the first floor slab.

[0040] The technical solution of this invention has the following advantages:

[0041] In this invention, the first L-shaped side formwork serves as the side formwork for pouring concrete for the first floor slab, and the second L-shaped side formwork serves as the side formwork for pouring concrete for the second floor slab. This creates an expansion joint between the first and second floor slabs, located at the top of the first steel beam. The first steel beam supports both the first and second floor slabs. The expansion joint has a relatively small interval width to ensure the supporting force of the first steel beam on the first and second floor slabs. Furthermore, the first steel beam can cover the bottom of the expansion joint and provide a certain degree of sealing, preventing any impact on the building's finish. The first L-shaped side formwork and... A first filling structure is installed between the second L-shaped side formwork. This structure acts as a buffer and waterproofing agent when the second L-shaped side formwork moves. Simultaneously, the first filling structure fills the expansion joint, reducing the impact on building function and decoration. Furthermore, the sliding arrangement of the second L-shaped side formwork allows the second floor slab to freely expand and contract along a second horizontal direction, reducing temperature stress and improving the floor slab's ability to adapt to temperature changes. It also acts as a buffer under horizontal earthquake and wind loads, ensuring the building's integrity. Compared to conventional expansion joints, it eliminates the need for expansion joints or reinforcing steel bars on every floor above the fixed end to resist temperature stress. This solves the technical problems of existing expansion joint structures being too wide, significantly impacting building function and decoration, and having continuous gaps in the floor slab at the expansion joint, posing a significant risk of leakage. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a structural schematic diagram of a floor slab expansion joint structure provided by the present invention;

[0044] Figure 2 A schematic diagram of the expansion joint at the connecting column between the first and second floor slabs provided by the present invention;

[0045] Figure 3 This is a front view schematic diagram of the connection structure between the connecting plate and the second steel beam provided by the present invention;

[0046] Figure 4 A top view schematic diagram of the connection structure between the connecting plate and the second steel beam provided by the present invention;

[0047] Figure 5 A step diagram illustrating the construction method of a floor slab expansion joint structure provided by the present invention;

[0048] Figure 6 This is a temperature stress analysis cloud diagram of the first floor slab without expansion joints provided in Embodiment 2 of the present invention;

[0049] Figure 7 This is a temperature stress analysis cloud diagram of the second floor slab without expansion joints provided in Embodiment 2 of the present invention;

[0050] Figure 8 This is a temperature stress analysis cloud diagram of the third floor slab without expansion joints provided in Embodiment 2 of the present invention;

[0051] Figure 9 This is a temperature stress analysis cloud diagram of the fourth floor slab without expansion joints, provided in Embodiment 2 of the present invention.

[0052] Figure 10 This is a temperature stress analysis cloud diagram of the fifth floor slab without expansion joints, provided in Embodiment 2 of the present invention.

[0053] Figure 11 This is a temperature stress analysis cloud diagram of the first floor slab when setting expansion joints, as provided in Embodiment 2 of the present invention.

[0054] Figure 12 This is a cloud diagram of temperature stress analysis of the second floor slab when an expansion joint is provided in Embodiment 2 of the present invention;

[0055] Figure 13This is a cloud diagram of temperature stress analysis of the third floor slab when an expansion joint is provided in Embodiment 2 of the present invention;

[0056] Figure 14 This is a cloud diagram of temperature stress analysis of the fourth floor slab when an expansion joint is set, as provided in Embodiment 2 of the present invention.

[0057] Figure 15 This is a cloud diagram of temperature stress analysis of the fifth floor slab when an expansion joint is set, as provided in Embodiment 2 of the present invention.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1. Connecting column; 2. First steel beam; 3. First L-shaped side formwork; 4. First floor slab; 5. Second L-shaped side formwork; 6. Second floor slab; 7. First filling structure; 8. First bolt; 9. First nut; 10. Second filling structure; 11. Waterstop steel plate; 12. Extension; 13. Pad layer; 14. Second steel beam; 15. Connecting plate; 16. Oblong hole; 17. Second bolt; 18. Rubber pad; 19. First fastener; 20. Second fastener. Detailed Implementation

[0060] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0064] Example 1

[0065] Please see Figures 1 to 4 This embodiment provides a floor slab expansion joint structure, comprising: a first steel beam 2; a first L-shaped side mold 3, fixedly disposed on the top of the first steel beam 2 along a first horizontal direction, suitable as a side mold for pouring concrete in the first floor slab 4; a first filling structure 7, disposed along the first horizontal direction on the side of the first L-shaped side mold 3 facing away from the first floor slab 4; and a second L-shaped side mold 5, disposed along the first horizontal direction on the top of the first steel beam 2 and located on the side of the first filling structure 7 facing away from the first L-shaped side mold 3, suitable as a side mold for pouring concrete in the second floor slab 6. The second L-shaped side mold 5 has a first movable state that slides along a second horizontal direction and a second fixed state that is relatively fixed to the first L-shaped side mold 3. The second floor slab 6 is suitable for pouring concrete when the second L-shaped side mold 5 is in the first fixed state. The first horizontal direction is perpendicular to the second horizontal direction, and an expansion joint is formed between the first L-shaped side mold 3 and the second L-shaped side mold 5. Both the first L-shaped side mold 3 and the second L-shaped side mold 5 include two straight plates connected at right angles.

[0066] It should be noted that the material of the first filling structure 7 can be a flexible material; the width of the first filling structure 7 can be set according to the width of the expansion joint; the first L-shaped side mold 3 and the second L-shaped side mold 5 are set along the length of the first steel beam 2; the first filling structure 7 is set along the height of the first floor slab 4 and the second floor slab 6, that is, the height is consistent, which is convenient for pouring.

[0067] In this embodiment, the first L-shaped side formwork 3 serves as the side formwork for pouring concrete into the first floor slab 4, and the second L-shaped side formwork 5 serves as the side formwork for pouring concrete into the second floor slab 6. This creates an expansion joint between the first floor slab 4 and the second floor slab 6, located at the top of the first steel beam 2. The first steel beam 2 supports the first floor slab 4 and the second floor slab 6. The expansion joint has a relatively small interval width to ensure the supporting force of the first steel beam 2 on the first floor slab 4 and the second floor slab 6. Furthermore, the first steel beam 2 can cover the bottom of the expansion joint and provide a certain degree of sealing, preventing any impact on the building's finish. A first filling structure 7 is set between the L-shaped side formwork 3 and the second L-shaped side formwork 5. This structure acts as a buffer and waterproofing agent when the second L-shaped side formwork 5 moves. Simultaneously, the first filling structure 7 fills the expansion joint, reducing the impact on building function and decoration. Furthermore, the sliding arrangement of the second L-shaped side formwork 5 allows the second floor slab 6 to freely expand and contract along the second horizontal direction, reducing temperature stress and improving the floor slab's ability to adapt to temperature changes. It also acts as a buffer under horizontal earthquake and wind loads, ensuring the building's integrity. Compared to conventional expansion joints, it eliminates the need for expansion joints or reinforcing steel bars on every floor above the fixed end to resist temperature stress. This solves the technical problems of existing expansion joint structures having large widths, significantly impacting building function and decoration, and creating continuous gaps in the floor slab at the expansion joint, posing a significant risk of leakage.

[0068] Example 2

[0069] As a further improvement to Example 1, such as Figure 1 As shown, the second L-shaped side mold 5 is connected to the first L-shaped side mold 3 by the first bolt 8. The shank of the first bolt 8 passes through the second L-shaped side mold 5, the first filling structure 7 and the first L-shaped side mold 3 in sequence along the second horizontal direction. The end of the first bolt 8 is threadedly connected to the first nut 9. The first bolt 8 has a second movable state in which it can slide and engage with the first L-shaped side mold 3 when the first nut 9 is removed, and a second fixed state in which the second L-shaped side mold 5 and the first L-shaped side mold 3 are fixed by connecting the first nut 9.

[0070] In this embodiment, after the second L-shaped side mold 5 is set on the other side of the first filling structure 7, it can be fixed to the first L-shaped side mold 3 by the first bolt 8 to prevent the second L-shaped side mold 5 from moving and affecting the pouring of the second floor slab 6. Specifically, the first bolt 8 is fixed by passing through the second L-shaped side mold 5, the first filling structure 7 and the first L-shaped side mold 3 in sequence and then by the first nut 9. When the first bolt 8 is in the second fixed state, concrete is poured on the side of the expansion joint located on the second L-shaped side mold 5 to form the second floor slab 6. After the pouring of the second floor slab 6 is completed, the first nut 9 is removed. Then the second L-shaped side mold 5 can be slidably engaged with the first L-shaped side mold 3 by the first bolt 8. That is, the second L-shaped side mold 5 can have the freedom to slide along the second horizontal direction on the second steel beam 14. Since the first bolt 8 is passed through the second L-shaped side mold 5, it forms a whole after the second floor slab 6 is poured. Therefore, the formed second floor slab 6 can also freely expand and contract within the expansion joint. At the same time, the first bolt 8 can prevent the first floor slab 4 and the second floor slab 6 from being misaligned in the first horizontal direction.

[0071] Specifically, there are multiple first bolts 8. Both the first L-shaped side mold 3 and the second L-shaped side mold 5 are provided with through holes for the first bolts 8 to pass through, which facilitates the improvement of the stability of the movable fit between the first L-shaped side mold 3 and the second L-shaped side mold 5, so that the second L-shaped side mold 5 can slide and be fixed with the first L-shaped side mold 3 through the first bolts 8.

[0072] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, it also includes a second filling structure 10, which covers one end of the first bolt 8 that extends into the first L-shaped side mold 3 when the first bolt 8 is in the second active state.

[0073] It should be noted that the second filling structure 10 can be made of a flexible material.

[0074] In this embodiment, after the first nut 9 is removed, the first bolt 8 is in the second active state. Then, the first bolt 8 is covered by the second filling structure 10 to prevent the concrete from contacting and connecting with the first bolt 8 when the first floor slab 4 is poured. This ensures that the first bolt 8 can move along the second horizontal direction after the first floor slab 4 is poured. That is, after the second floor slab 6 is poured, it has a degree of freedom of movement along the first horizontal direction to reduce temperature stress.

[0075] As an alternative implementation, a sealing structure is also included. This sealing structure is a hollow shell with an opening on the side facing the first bolt 8. When the first bolt 8 is in its second movable state, the sealing structure covers the end of the first bolt 8 that extends into the first L-shaped side mold 3. In this embodiment, the structure of the sealing structure is not specifically limited, but is preferably a hollow shell with an opening on the side facing the first bolt 8. The shell covers the first bolt 8 through this opening, and both sides of the opening are sealed and fitted to the first L-shaped side mold 3. This ensures that the concrete does not contact or connect with the first bolt 8 during the pouring of the first floor slab 4, ensuring that the first bolt 8 can move along the second horizontal direction after the first floor slab 4 is poured. In other words, after pouring, the second floor slab 6 has freedom of movement along the second horizontal direction, thus reducing temperature stress. The sealing structure can also be a hollow pipe with openings on its periphery.

[0076] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, a first fastener 19 is provided in the first L-shaped side mold 3 along the vertical direction.

[0077] In this embodiment, the first L-shaped side mold 3 is formed as a whole after the first floor slab 4 is poured by the first fastener 19, which improves the firmness of the connection between the first L-shaped side mold 3 and the first floor slab 4.

[0078] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, a second fastener 20 is provided in the second L-shaped side mold 5 along the vertical direction.

[0079] In this embodiment, the second L-shaped side mold 5 is formed as a whole after the second floor slab 6 is poured by the second fastener 20, which improves the firmness of the connection between the second L-shaped side mold 5 and the second floor slab 6.

[0080] Specifically, both the first fastener 19 and the second fastener 20 are studs.

[0081] As an alternative implementation, the first fastener 19 and the second fastener 20 may both be cylindrical fixing rods, with a limiting part at the top of the fixing rod to improve the firmness of the connection between the first L-shaped side mold 3 and the first floor slab 4, and the connection between the second L-shaped side mold 5 and the second floor slab 6.

[0082] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, the first L-shaped side mold 3 is welded to the first steel beam 2.

[0083] It should be noted that the first L-shaped edge mold 3 is made of metal.

[0084] Welded joints are the most common connection method for steel structures today, and are generally made using electric arc welding. The electric arc generates heat that melts the welding rod and the workpiece together, and after cooling, they form a weld, thus joining the welded parts into a single unit.

[0085] In this embodiment, by using welded connections, the connection strength and integrity between the first L-shaped side mold 3 and the first steel beam 2 are enhanced, while the airtightness is increased and the waterproof effect is improved.

[0086] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, both the first L-shaped side mold 3 and the second L-shaped side mold 5 are angle steel.

[0087] In this embodiment, the first L-shaped side mold 3 and the second L-shaped side mold 5 are made of angle steel, which facilitates connection with the first steel beam 2 and the welded connection between the first L-shaped side mold 3 and the first steel beam 2, and also provides high structural strength.

[0088] As a possible implementation method, it can also be, for example... Figure 1 As shown, both the first L-shaped side mold 3 and the second L-shaped side mold 5 are L-shaped steel plate bending parts. In this embodiment, the first L-shaped side mold 3 and the second L-shaped side mold 5 are L-shaped steel plate bending parts, which facilitates connection with the first steel beam 2 and facilitates welded connection between the first L-shaped side mold 3 and the first steel beam 2, and also provides high structural strength.

[0089] Specifically, one of the straight plates of the first L-shaped side mold 3 and the second L-shaped side mold 5 is set parallel to the top of the first steel beam 2 and in opposite directions, so as to serve as a side mold when pouring the first floor slab 4 and the second floor slab 6.

[0090] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, the first steel beam 2 is an I-beam.

[0091] In this embodiment, an I-beam is used, which has wide flanges, high lateral stiffness, and strong bending resistance. The parallel surfaces of the flanges make connection, processing, and installation simple. Compared with ordinary steel, it has low cost, high precision, and low residual stress. It does not require expensive welding materials and weld inspection, thus saving on steel structure manufacturing costs.

[0092] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, the first filling structure 7 is an extruded polystyrene board.

[0093] In this embodiment, the first filling structure 7 is made of extruded polystyrene board, which plays a role in waterproofing and moisture-proofing at the expansion joint. At the same time, it fills the expansion joint, improves the overall integrity of the floor, facilitates building decoration, and the extruded polystyrene board is lightweight, has a certain degree of compression resistance and flexibility, can effectively alleviate the expansion and contraction changes of the expansion joint under temperature stress, and has a long service life.

[0094] As a possible implementation method, it can also be, for example... Figure 1 As shown, the first filling structure 7 is a foam board. It should be noted that this embodiment does not limit the material of the second filling structure 10; the material of the second filling structure 10 can also be other flexible materials with the same properties as extruded polystyrene board or foam board, as those skilled in the art should understand. In this embodiment, the first filling structure 7 uses foam board, which serves as a waterproof and moisture-proof layer at the expansion joint, while also filling the expansion joint, improving the overall integrity of the floor, facilitating building decoration, and because foam board is lightweight, has a certain degree of compression resistance and flexibility, it can effectively alleviate the expansion and contraction changes of the expansion joint under temperature stress, resulting in a long service life.

[0095] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, the width of the first steel beam 2 is greater than or equal to 300mm.

[0096] In this embodiment, the width of the first steel beam 2 is limited to ensure that the first floor slab 4 and the second floor slab 6 have sufficient supporting area in the first steel beam 2, thereby improving safety and support capacity.

[0097] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, the second filling structure 10 is an extruded polystyrene board.

[0098] In this embodiment, the second filling structure 10 uses extruded polystyrene board to seal the first bolt 8, preventing the concrete used for pouring the first floor slab 4 from seeping in and connecting with the first bolt 8 to fix it. At the same time, the extruded polystyrene board is lightweight and has a certain degree of compression resistance and flexibility, ensuring that the first bolt 8 can deform under the pressure of the extruded polystyrene board.

[0099] As a possible implementation method, it can also be, for example... Figure 1 As shown, the second filling structure 10 is a foam board. It should be noted that this embodiment does not limit the material of the second filling structure 10; the material of the second filling structure 10 can also be other flexible materials with the same properties as extruded polystyrene board or foam board, as should be understood by those skilled in the art. In this embodiment, the second filling structure 10 uses a foam board to seal the first bolt 8, preventing the concrete used for pouring the first floor slab 4 from penetrating and connecting with the first bolt 8 for fixation. Simultaneously, the foam board is lightweight and has a certain degree of compression resistance and flexibility, ensuring that the first bolt 8 can deform under the pressure of the foam board.

[0100] Based on the above embodiments, in a specific embodiment, such as Figure 1As shown, it also includes a water-stop steel plate 11, which is set along the expansion joint; the length of the straight plate of the first L-shaped side mold 3 in the vertical direction is greater than the length of the straight plate of the second L-shaped side mold 5 in the vertical direction; one side of the water-stop steel plate 11 is welded to the first L-shaped side mold 3, and the other side extends into one side of the second floor slab 6 in the second horizontal direction through the extension 12.

[0101] It should be noted that when the expansion joint structure is located in a room with water, a water-stop steel plate can be installed to improve waterproofing performance. When the expansion joint structure is located in a room without water, the installation of the water-stop steel plate can be omitted to reduce costs. The choice can be made according to the actual situation.

[0102] In this embodiment, a water-stop steel plate 11 is installed inside the expansion joint, and the water-stop steel plate 11 passes through the first filling structure 7 to prevent water leakage. In particular, when the expansion joint is set in a room with water, it plays a waterproof role. The vertical length of the first L-shaped side mold 3 is greater than the vertical length of the second L-shaped side mold 5, and the two are set at different heights. At this time, the first filling structure 7 can also be used as a side mold for the casting of the second floor slab 6. This makes it convenient for one side of the water-stop steel plate 11 to extend into one side of the second floor slab 6 when the side of the water-stop steel plate 11 is welded to the first L-shaped side mold 3, and to be cast together with the second floor slab 6, thereby improving the stability and waterproof performance of the water-stop steel plate 11.

[0103] Based on the above embodiments, in a specific embodiment, such as Figure 1 As shown, a padding layer 13 is provided on one side of the extension 12.

[0104] In this embodiment, during the movement of the second floor slab 6, the extension 12 and the second floor slab 6 may slide relative to each other. The padding layer 13 serves to waterproof the surface and reduce the friction between the extension 12 and the second floor slab 6, thereby improving the service life.

[0105] Specifically, such as Figure 1 As shown, the water-stop steel plate 11 is a V-shaped water-stop steel plate.

[0106] Specifically, this embodiment does not specifically limit the structure of the pad 13. The pad 13 is a rubber strip, and there are multiple rubber strips arranged side by side along the width of the extension 12. The pad 13 can also be a rubber pad.

[0107] Specifically, the padding layer 13 is disposed on top of the extension 12 to further improve the waterproof performance.

[0108] Based on the above embodiments, in a specific embodiment, such as Figures 2 to 4 As shown, it also includes a connecting column 1, which is located on one side of the second floor slab 6 along the second horizontal direction and is connected to a second steel beam 14 via a connecting plate 15. The second steel beam 14 is adapted to support the second floor slab 6.

[0109] It should be noted that the first steel beam 2 is connected to the connecting column 1 along the first horizontal direction; there is an expansion joint between the connecting column 1 and the second floor slab 6.

[0110] In this embodiment, the second floor slab 6 is supported by a second steel beam 14 to improve the support strength.

[0111] Based on the above embodiments, in a specific embodiment, such as Figures 2 to 4 As shown, the connecting plate 15 has multiple elongated holes 16 through it. The length direction of the elongated holes 16 is parallel to the second horizontal direction. The second steel beam 14 is connected to the connecting plate 15 by the second bolt 17. The second bolt 17 passes through the second steel beam 14 and the elongated holes 16 in sequence, and the end of the second bolt 17 is fixed by the second nut.

[0112] It should be noted that the width of the oblong hole 16 is smaller than the diameter of the second nut.

[0113] In this embodiment, the connecting plate 15 and the second steel beam 14 are connected by the second bolt 17. When subjected to temperature stress, the second bolt 17 can move within the elongated hole 16 to reduce stress, play a buffering role, improve safety performance, and reduce the temperature stress between the first floor slab 4 and the second floor slab 6 in conjunction with the expansion joint.

[0114] Specifically, the connecting plate 15 and the connecting column 1 are welded with a K-type bevel to improve the connection strength.

[0115] Based on the above embodiments, in a specific embodiment, such as Figure 4 As shown, a rubber pad 18 is provided between the second steel beam 14 and the connecting plate 15.

[0116] In this embodiment, a rubber pad 18 is provided between the second steel beam 14 and the connecting plate 15. The second bolt 17 can move through the elongated hole 16 of the shear rubber pad to play a buffering role, while reducing the friction between the second steel beam 14 and the connecting plate 15 and improving the service life.

[0117] Based on the above embodiments, in a specific embodiment, such as Figure 3 and Figure 4 As shown, the second steel beam 14 is an I-beam.

[0118] In this embodiment, an I-beam is used, which has wide flanges, high lateral stiffness, and strong bending resistance. The parallel surfaces of the flanges make connection, processing, and installation simple. Compared with ordinary steel, it has low cost, high precision, and low residual stress. It does not require expensive welding materials and weld inspection, thus saving on steel structure manufacturing costs.

[0119] Specifically, the connecting plate 15 is arranged vertically and connected to the middle plate of the I-beam. The connecting plate 15 and the middle plate of the I-beam are stacked parallel to each other, and the rubber pad 18 is placed between the connecting plate 15 and the middle plate of the I-beam to improve the support and connection strength.

[0120] The working principle of the floor expansion joint structure provided in this embodiment is as follows: The first L-shaped side mold 3 is welded and fixed to the first steel beam 2 to improve stability and waterproofing. Then, according to the width of the expansion joint, a first filling structure 7 is set between the first L-shaped side mold 3 and the second L-shaped side mold 5 to provide buffering and waterproofing, while simultaneously filling the expansion joint to reduce the impact on building function and decoration. Next, the second L-shaped side mold 5 is connected to the first L-shaped side mold 3 in a first fixed state using first bolts 8 and first nuts 9, preventing the movement of the second L-shaped side mold 5 from affecting the second floor slab 6. The expansion joint is located at the top of the first steel beam 2, which supports the first floor slab 4 and the second floor slab 6. The expansion joint has a relatively small interval to ensure the supporting force of the first steel beam 2 on the first floor slab 4 and the second floor slab 6. The first steel beam 2 also covers the bottom of the expansion joint and provides a certain degree of sealing, preventing interference with the building's finish. Next, a water-stop steel plate 11 is placed inside the expansion joint and connected to the first L-shaped side formwork 3 to prevent water leakage through the expansion joint. Then, concrete is poured on the side of the expansion joint located at the second L-shaped side formwork 5. The second floor slab 6 is formed, which is integral with the first bolt 8, the first fastener 19, and the second L-shaped side mold 5. Then, the first nut 9 is removed, so that the first bolt 8 is in a second movable state. After the first bolt 8 is covered by the second filling structure 10, concrete is poured on the side of the expansion joint located at the first L-shaped side mold 3 to form the first floor slab 4. The first floor slab 4 is integral with the first L-shaped side mold 3 and the second fastener 20. Since the first bolt 8 can move freely in the second horizontal direction within the first L-shaped side mold 3, the second floor slab 6 can move freely in the second horizontal direction relative to the first floor slab 4 on the first steel beam 2. This movement reduces temperature stress, improves the floor slab's ability to adapt to temperature changes, and acts as a buffer under horizontal earthquake and wind loads to ensure the integrity of the building. At the same time, the connecting column 1 is connected to the second steel beam 14 supporting the first floor slab 4 through the connecting plate 15. The cooperation structure between the connecting plate 15 and the second steel beam 14 further improves the floor slab's ability to adapt to temperature changes. Compared with conventional expansion joints, it is not necessary to set expansion joints or configure reinforcing steel bars to resist temperature stress on each floor above the embedded end. This solves the technical problems of existing expansion joint structures being too wide, significantly impacting building function and decoration, and having continuous gaps in the floor slab at the expansion joint, posing a significant risk of water leakage.

[0121] In one embodiment, temperature stress analysis was performed on two identical five-story buildings. One building did not have the expansion joint structure provided in this embodiment on any of its floor slabs, while the other building had the expansion joint structure provided in this embodiment on its first and second floor slabs. The temperature stress analysis of the floor slabs in both buildings is as follows: Temperature stress analysis of the floor slabs of the building without the expansion joint structure provided in this embodiment is as follows: Figures 6 to 10 As shown in the figure, it is clear that the temperature stress of each floor slab is relatively concentrated and large; the temperature stress analysis of each floor slab in a building with the expansion joint structure provided in this embodiment installed on the first and second floors is as follows. Figures 11 to 15 As shown in the figure, after setting the expansion joint structure of this embodiment only on the first and second floors, it can be clearly seen from the figure that the temperature stress of each floor slab is small and evenly distributed. Therefore, the floor expansion joint structure provided in this embodiment is effective in solving the problem of floor temperature stress.

[0122] Example 3

[0123] Please see Figure 5 This embodiment provides a construction method for a floor slab expansion joint structure, including the following steps:

[0124] Step S1: Fix the first L-shaped side mold 3 on the top of the first steel beam 2;

[0125] Step S2: According to the width of the expansion joint, set the first filling structure 7 on the side of the first L-shaped side mold 3 facing the expansion joint;

[0126] Step S3: Set a second L-shaped side mold 5 on the side of the first filling structure 7 away from the first L-shaped side mold 3, and connect the second L-shaped side mold 5 and the first L-shaped side mold 3 to the first fixed state;

[0127] Step S4: Pour concrete on one side of the expansion joint located at the second L-shaped side formwork 5 to form the second floor slab 6;

[0128] Step S5: Connect the second L-shaped side mold 5 to the first L-shaped side mold 3 in the first active state, and pour concrete on the side of the expansion joint located in the first L-shaped side mold 3 to form the first floor slab 4.

[0129] In this embodiment, the floor slab expansion joint structure formed by the above construction method firstly fixes the first L-shaped side formwork 3 on the top of the first steel beam 2. Then, according to the width of the expansion joint, a first filling structure 7 is set on the side of the first L-shaped side formwork 3 facing the expansion joint, serving as a buffer and waterproofing element between the first L-shaped side formwork 3 and the second L-shaped side formwork 5. Simultaneously, the first filling structure 7 fills the expansion joint, reducing the impact on building function and decoration. Next, a second L-shaped side formwork 5 is set on the side of the first filling structure 7 away from the first L-shaped side formwork 3, and the second L-shaped side formwork 5 is connected to the first L-shaped side formwork 3 in a first fixed state to prevent the movement of the second L-shaped side formwork 5 from affecting the pouring of the second floor slab 6. The expansion joint is located on the top of the first steel beam 2, which supports the first floor slab 4 and the second floor slab 6. Relatively speaking, the interval width of the expansion joint is small to ensure that the first steel beam 2 supports the first floor slab 4 and the second floor slab 6. The first steel beam 2 provides support and can shield the bottom of the expansion joint, providing a certain degree of sealing and preventing impact on building decoration. Secondly, concrete is poured on one side of the expansion joint located at the second L-shaped formwork 5 to form the second floor slab 6. Then, the second L-shaped formwork 5 is connected to the first L-shaped formwork 3 in a first movable state, allowing the second L-shaped formwork 5 to move along a second horizontal direction. Concrete is then poured on the side of the expansion joint located at the first L-shaped formwork 3 to form the first floor slab 4. After the first floor slab 4 and the second floor slab 6 are poured, the poured second floor slab 6 can move freely relative to the first floor slab 4 along the second horizontal direction on the first steel beam 2. This movement reduces temperature stress, improves the floor slab's ability to adapt to temperature changes, and acts as a buffer under horizontal earthquakes and wind loads, ensuring the building's integrity. Compared to conventional expansion joints, it eliminates the need for expansion joints or reinforcing steel bars on each floor above the fixed end to resist temperature stress. This solves the technical problems of existing expansion joint structures having large widths, significantly impacting building function and decoration, and the presence of continuous gaps in each floor slab at the expansion joint, posing a significant risk of leakage.

[0130] Example 4

[0131] As a further improvement to Example 3, step S3 specifically includes:

[0132] Step S301: A second L-shaped side mold 5 is provided on the side of the first filling structure 7 away from the first L-shaped side mold 3;

[0133] Step S302: The second L-shaped side mold 5 is connected to the first L-shaped side mold 3 by the first bolt 8. The shank of the first bolt 8 passes through the second L-shaped side mold 5, the first filling structure 7 and the first L-shaped side mold 3 in sequence along the second horizontal direction, and the end of the first bolt 8 is threaded with a first nut 9. The first bolt 8 is in the second fixed state.

[0134] In this embodiment, after the second L-shaped side mold 5 is set on the other side of the first filling structure 7, it can be fixed to the first L-shaped side mold 3 by the first bolt 8 to prevent the second L-shaped side mold 5 from moving and affecting the pouring of the second floor slab 6. Specifically, the first bolt 8 is fixed by passing through the second L-shaped side mold 5, the first filling structure 7 and the first L-shaped side mold 3 in sequence and then by the first nut 9. When the first bolt 8 is in the second fixed state, it is convenient to pour concrete on the side of the expansion joint located on the second L-shaped side mold 5 to form the second floor slab 6.

[0135] Based on the above implementation methods, in a specific implementation method, step S5 specifically includes:

[0136] Step S501: Remove the first nut 9 from the first bolt 8, and cover one end of the first bolt 8 extending into the first L-shaped side mold 3 with the second filling structure 10, so that the first bolt 8 is in the second active state.

[0137] Step S502: Pour concrete on one side of the expansion joint located at the first L-shaped side formwork 3 to form the first floor slab 4.

[0138] In this embodiment, after the second floor slab 6 is poured, the first nut 9 on the first bolt 8 is removed, so that the first bolt 8 is in a second movable state. Then, the first bolt 8 is covered by the second filling structure 10 and extends into one end of the first L-shaped side mold 3 to prevent the concrete from contacting and connecting with the first bolt 8 when the first floor slab 4 is poured. Then, concrete is poured on the side of the expansion joint located on the first L-shaped side mold 3 to form the first floor slab 4. The second L-shaped side mold 5 can be slidably engaged with the first L-shaped side mold 3 through the first bolt 8. That is, the second L-shaped side mold 5 can have the freedom to slide along the second horizontal direction on the second steel beam 14. Since the first bolt 8 passes through the second L-shaped side mold 5 and forms a whole after the second floor slab 6 is poured, the formed second floor slab 6 can also freely expand and contract within the expansion joint. At the same time, the first bolt 8 can prevent the first floor slab 4 and the second floor slab 6 from being misaligned in the first horizontal direction.

[0139] Based on the above implementation method, in one specific implementation method, the method further includes the following step before step S4:

[0140] A water-stop steel plate 11 is installed along the first horizontal direction inside the expansion joint. One side of the water-stop steel plate 11 is welded to the first L-shaped side mold 3, and the other side extends into one side of the first floor slab 4 along the second horizontal direction through the extension part 12.

[0141] In this embodiment, before pouring the second floor slab 6, the water-stop steel plate 11 is placed inside the expansion joint and welded to the first L-shaped side mold 3 so that the water-stop steel plate 11 can play a waterproof role inside the expansion joint, further improving the waterproof effect and preventing water from seeping from the expansion joint.

[0142] The specific process of the construction method for the floor expansion joint structure provided in this embodiment is as follows: First, the first L-shaped side mold 3 is fixedly set on the top of the first steel beam 2. Then, according to the width of the expansion joint, the first filling structure 7 is set on the side of the first L-shaped side mold 3 facing the expansion joint. It plays a buffering and waterproofing role between the first L-shaped side mold 3 and the second L-shaped side mold 5. At the same time, the expansion joint is filled by the first filling structure 7 to reduce the impact on building function and decoration. Then, it is fixed to the first L-shaped side mold 3 by the first bolt 8. Specifically, the first bolt 8 is fixed by passing through the second L-shaped side mold 5, the first filling structure 7 and the first L-shaped side mold 3 in sequence and then by the first nut 9. When bolt 8 is in the second fixed state, it can prevent the movement of the second L-shaped side mold 5 from affecting the pouring of the second floor slab 6. The expansion joint is set at the top of the first steel beam 2, and the first steel beam 2 supports the first floor slab 4 and the second floor slab 6. Relatively speaking, the interval width of the expansion joint is small to ensure the supporting force of the first steel beam 2 on the first floor slab 4 and the second floor slab 6. The first steel beam 2 can also cover the bottom end of the expansion joint and play a certain sealing role to avoid affecting the building decoration. Secondly, a water-stop steel plate 11 is installed along the first horizontal direction inside the expansion joint. One side of the water-stop steel plate 11 is welded to the first L-shaped side mold 3, and the other side extends into the second horizontal direction through the extension part 12. To further enhance the waterproofing effect on one side of the first floor slab 4 and prevent water leakage from the expansion joint, concrete is poured on the side of the expansion joint located at the second L-shaped side formwork 5 to form the second floor slab 6. Then, the first nut 9 on the first bolt 8 is removed, placing the first bolt 8 in a second movable state. Next, the second filling structure 10 covers one end of the first bolt 8 extending into the first L-shaped side formwork 3, preventing the concrete from contacting and connecting with the first bolt 8 during the pouring of the first floor slab 4. Concrete is then poured on the side of the expansion joint located at the first L-shaped side formwork 3 to form the first floor slab 4. The second L-shaped side formwork 5 can slide with the first L-shaped side formwork 3 via the first bolt 8, meaning the second L-shaped side formwork 5 can slide with the first L-shaped side formwork 3. The two steel beams 14 have a degree of freedom to slide along the second horizontal direction. Since the first bolt 8 passes through the second L-shaped side mold 5 and forms a whole after the second floor slab 6 is poured, the formed second floor slab 6 can also freely expand and contract within the expansion joint. At the same time, the first bolt 8 can prevent the first floor slab 4 and the second floor slab 6 from misaligning with each other in the first horizontal direction. The relative movement between the second floor slab 6 and the first floor slab 4 reduces temperature stress, improves the floor slab's ability to adapt to temperature changes, and acts as a buffer under horizontal earthquake and wind loads to ensure the integrity of the building. Compared with conventional expansion joints, it is not necessary to set expansion joints or reinforce with steel bars to resist temperature stress on each floor above the embedded end. This solves the technical problems of existing expansion joint structures having large widths, which have a significant impact on building function and decoration, and the presence of continuous gaps in each floor slab at the expansion joint, which poses a significant risk of water leakage.

[0143] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A floor slab expansion joint structure, characterized in that, include: First steel beam (2); The first L-shaped side formwork (3) is fixedly installed on the top of the first steel beam (2) along the first horizontal direction, and is suitable as a side formwork for concrete pouring of the first floor slab (4); The first filling structure (7) is set along the first horizontal direction on the side of the first L-shaped side mold (3) away from the first floor slab (4); The second L-shaped side mold (5) is set on top of the first steel beam (2) along the first horizontal direction and is located on the side of the first filling structure (7) facing away from the first L-shaped side mold (3). It is suitable as a side mold for concrete pouring of the second floor slab (6). The second L-shaped side mold (5) has a first active state that slides along the second horizontal direction and a first fixed state that is relatively fixed to the first L-shaped side mold (3). The second floor slab (6) is suitable for pouring concrete when the second L-shaped side mold (5) is in the first fixed state. Wherein, the first horizontal direction is perpendicular to the second horizontal direction, an expansion joint is formed between the first L-shaped side mold (3) and the second L-shaped side mold (5), and both the first L-shaped side mold (3) and the second L-shaped side mold (5) include two straight plates connected at right angles; The second L-shaped side mold (5) is connected to the first L-shaped side mold (3) by the first bolt (8). The end of the shank of the first bolt (8) passes through the second L-shaped side mold (5), the first filling structure (7) and the first L-shaped side mold (3) in sequence along the second horizontal direction. The end of the shank of the first bolt (8) is threadedly connected to the first nut (9). The first bolt (8) has a second active state in which it can slide with the first L-shaped side mold (3) when the first nut (9) is removed, and a second fixed state in which the second L-shaped side mold (5) and the first L-shaped side mold (3) are fixed by connecting the first nut (9).

2. The floor slab expansion joint structure according to claim 1, characterized in that, It also includes a second filling structure (10), which covers one end of the first bolt (8) that extends into the first L-shaped side mold (3) when the first bolt (8) is in the second active state; And / or, the first L-shaped side mold (3) is provided with a first fastener (19) along the vertical direction. And / or, the second L-shaped side mold (5) is provided with a second fastener (20) along the vertical direction; And / or, the first L-shaped side mold (3) is welded to the first steel beam (2); And / or, the first L-shaped side mold (3) and the second L-shaped side mold (5) are both angle steel or L-shaped steel plate bending parts; And / or, the first steel beam (2) is an I-beam; And / or, the first filling structure (7) is an extruded polystyrene board; And / or, the width of the first steel beam (2) is greater than or equal to 300 mm.

3. The floor slab expansion joint structure according to claim 1, characterized in that, It also includes a water-stop steel plate (11), which is set along the expansion joint; the vertical length of the first L-shaped side mold (3) is greater than the vertical length of the second L-shaped side mold (5); one side of the water-stop steel plate (11) is welded to the first L-shaped side mold (3), and the other side extends into the second floor slab (6) along the second horizontal direction through the extension (12).

4. The floor slab expansion joint structure according to claim 3, characterized in that, A pad (13) is provided on one side of the extension (12).

5. The floor slab expansion joint structure according to any one of claims 1-4, characterized in that, It also includes a connecting column (1), which is located on one side of the second floor slab (6) along the second horizontal direction and is connected to a second steel beam (14) via a connecting plate (15). The second steel beam (14) is adapted to support the second floor slab (6).

6. The floor slab expansion joint structure according to claim 5, characterized in that, The connecting plate (15) is provided with a plurality of elongated holes (16), the length direction of the elongated holes (16) is parallel to the second horizontal direction, the second steel beam (14) is connected to the connecting plate (15) by a second bolt (17); the second bolt (17) passes through the second steel beam (14) and the elongated holes (16) in sequence, and the end of the second bolt (17) is fixed by a second nut; And / or, a rubber pad (18) is provided between the second steel beam (14) and the connecting plate (15). And / or, the second steel beam (14) is an I-beam.

7. A construction method for a floor slab expansion joint structure as described in any one of claims 1 to 6, characterized in that, include: The first L-shaped side mold (3) is fixedly set on the top of the first steel beam (2); According to the width of the expansion joint, a first filling structure (7) is provided on the side of the first L-shaped side mold (3) facing the expansion joint. A second L-shaped side mold (5) is provided on the side of the first filling structure (7) away from the first L-shaped side mold (3), and the second L-shaped side mold (5) is connected to the first L-shaped side mold (3) in a first fixed state; Concrete is poured on the side of the second L-shaped side mold (5) away from the expansion joint to form the second floor slab (6); The second L-shaped side mold (5) is connected to the first L-shaped side mold (3) in the first active state, and concrete is poured on the side of the first L-shaped side mold (3) away from the expansion joint to form the first floor slab (4).

8. The construction method of the floor slab expansion joint structure according to claim 7, characterized in that, The step of setting a second L-shaped side mold (5) on the side of the first filling structure (7) away from the first L-shaped side mold (3) and connecting the second L-shaped side mold (5) to the first L-shaped side mold (3) in a first fixed state specifically includes: A second L-shaped side mold (5) is provided on the side of the first filling structure (7) away from the first L-shaped side mold (3); The second L-shaped side mold (5) is connected to the first L-shaped side mold (3) by the first bolt (8). The end of the shank of the first bolt (8) passes through the second L-shaped side mold (5), the first filling structure (7) and the first L-shaped side mold (3) in sequence along the second horizontal direction. The end of the shank of the first bolt (8) is threaded with a first nut (9). The first bolt (8) is in a second fixed state.

9. The construction method of the floor slab expansion joint structure according to claim 8, characterized in that, The step of connecting the second L-shaped side mold (5) to the first L-shaped side mold (3) in a first active state, and pouring concrete on the side of the first L-shaped side mold (3) away from the expansion joint to form the first floor slab (4), specifically includes: Remove the first nut (9) from the first bolt (8) and cover the first bolt (8) with the second filling structure (10) inside the first L-shaped side mold (3) so that the first bolt (8) is in the second active state; Concrete is poured on the side of the first L-shaped side mold (3) away from the expansion joint to form the first floor slab (4).

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