Connecting structure for limited slippage of composite beam

Abstract

The invention relates to the technical field of bridge connecting structures, in particular to a connecting structure for limited slippage of a composite beam. According to the technical scheme, the anchoring device comprises an anchoring part, the anchoring part comprises a nail column, a cover cap, an expansion butt joint cylinder, a separation block and an expansion block, the top end of the cover cap is in sliding connection with the nail column, the top end of the nail column is connected with the expansion butt joint cylinder in an up-down sliding mode, the top of the expansion butt joint cylinder makes contact with an upper-layer concrete slab, and the middle of the cover cap is in threaded connection with the separation block. According to the device, the expansion butt joint cylinder is subjected to downward pushing force of expansion of the upper-layer concrete slab, so that the separation block moves downwards to open the multiple expansion blocks, after the upper-layer concrete slab is expanded, when holes in the upper-layer concrete slab are expanded, the flexible sleeve is opened through the expansion blocks, and the influence of expansion of the upper-layer concrete slab on the movable range is reduced; and deformation and damage caused by mutual extrusion of the two composite beams at the original adjacent positions due to the fact that the movable range of the upper-layer concrete plate is too large due to expansion of the holes in the upper-layer concrete plate are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of bridge connection structures, and in particular to a connection structure of a composite beam with limited sliding. Background Art

[0002] A composite beam is a structural beam composed of a steel beam and a concrete slab through connectors. It is commonly found in bridge structures. The advantage of a composite beam is that it can give full play to the advantages of steel beams and concrete slabs, improve the bearing capacity and rigidity of the beam, while reducing the amount of steel used and reducing the project cost. Due to factors such as temperature changes, loads or earthquakes, bridges may experience deformations such as expansion, contraction, bending or torsion. By allowing limited movement of composite beams, stress concentration inside the structure can be reduced, thereby improving the seismic resistance and durability of the structure.

[0003] The patent document with publication number CN116290346A discloses a limited slip connection structure and a construction method of the connection structure. A flexible sleeve is arranged on the nail column. The flexible sleeve can provide a flexible connection between the precast panel and the concrete panel, and provide an appropriate amount of slip between the precast panel and the concrete panel, which can effectively reduce the tensile stress of the concrete panel and improve the long-term performance and durability of the concrete panel. When the precast panel and the concrete panel are subjected to force at the same time, the concrete panel can slide relative to the precast panel to avoid excessive tensile stress on the concrete panel and prevent damage to the concrete panel.

[0004] When the concrete slab expands due to the increase in temperature, the diameter of the holes on it expands, so the limited displacement of the concrete slab increases. The movable amount of the concrete slab exceeds the width of the expansion joint between adjacent concretes, which will cause the concrete slabs in adjacent positions to squeeze each other, causing deformation and damage. Summary of the invention

[0005] The purpose of the present invention is to propose a limited slip connection structure for composite beams to solve the problem in the background technology that the limited displacement of prefabricated parts reduces the change in the spacing between expansion joints, so that adjacent prefabricated parts are squeezed against each other, deformed and damaged.

[0006] The technical solution of the present invention is a composite beam limited slip connection structure, comprising a bottom steel plate and an upper concrete plate, wherein the upper concrete plate is cast on the top of the bottom steel plate, and further comprising:

[0007] An anchor, the anchor comprises a nail column, a cap, an expansion butt tube, a separation block and an expansion block, the top of the cap is slidably connected to the nail column, the top of the nail column is slidably connected to the expansion butt tube up and down, the top of the expansion butt tube contacts the upper concrete slab, the middle of the cap is threadedly connected to the separation block, a resistance member is arranged between the bottom of the cap and the separation block, the outer wall of the separation block contacts the expansion block, a plurality of the expansion blocks are arranged, and are distributed in a circular shape with equal angles along the cap;

[0008] A flexible member, wherein the flexible member comprises a flexible sleeve, the outer arc surface of the expansion block is sleeved with the flexible sleeve, and the flexible sleeve is in contact with the upper concrete slab;

[0009] The top end of the nail column is fixedly connected to the upper concrete slab, and the bottom end of the cap is fixedly connected to the bottom steel plate.

[0010] Optionally, the separation block adopts a hollow truncated cone structure, and multiple expansion blocks form a cylindrical structure. The arc surface of the separation block fits with the inner wall of the expansion block. Multiple guide rods are fixedly installed at the middle part of the cap. The number of the guide rods is the same as the number of the expansion blocks, and the expansion blocks slide on the guide rods.

[0011] Optionally, the expansion butt joint tube is located at the center of the top of the nail column, and an embedding groove is opened on the top of the expansion butt joint tube. The cross-section of the embedding groove adopts a convex structure, and the upper concrete slab is poured into the embedding groove on the top of the expansion butt joint tube.

[0012] Optionally, a plug rod is fixedly installed at the bottom of the expansion docking tube, the cover cap adopts a T-shaped structure, a clearance hole is opened on the horizontal part of the nail column, the plug rod passes through the horizontal part of the nail column from the clearance hole, the diameter of the clearance hole is larger than the diameter of the plug rod, and the bottom of the plug rod is connected to the separation block through a resistance piece.

[0013] Optionally, the resistance member includes a sleeve, a plug plate and a conversion, the middle part of the cap and located above the separation block is threadedly connected to the sleeve, the top of the sleeve is rotatably connected to the conversion, the top of the conversion is fixedly connected to the plug rod, the bottom of the sleeve is fixedly installed with the plug plate, the top of the separation block is provided with a socket, and the plug plate slides up and down at the socket of the separation block.

[0014] Optionally, a second thread is provided at the connection between the cap and the screw sleeve, a first thread is provided at the threaded connection between the cap and the separation block, the second thread is located above the first thread, and a pitch of the second thread is longer than a pitch of the first thread.

[0015] Optionally, an extension tube is fixedly installed at the bottom of the conversion, and an inlay is opened on the inner wall of the screw sleeve near the conversion position. The extension tube rotates at the inlay of the inner wall of the screw sleeve, and there is a distance between the extension tube and the inlay.

[0016] Optionally, the flexible part also includes a separation groove, a first docking block and a second docking block. Two symmetrically arranged separation grooves are opened on the arc surface of the flexible sleeve. The two separation grooves divide the flexible sleeve into two left and right parts. The first docking block is fixedly installed at the separation groove of the right half of the flexible sleeve, and the second docking block is fixedly installed at the separation groove of the left half of the flexible sleeve. The first docking block and the second docking block both adopt a triangular structure, and the first docking block and the second docking block are staggered at the separation groove.

[0017] Optionally, the first docking block adopts a triangular structure, and multiple first docking blocks are provided. The shape and number of the second docking blocks are the same as those of the first docking block. The tips of the first docking block and the second docking block are both provided with rubber balls. The rubber ball at the tip of the second docking block is point-connected to the right half of the flexible sleeve, and the rubber ball at the tip of the first docking block is point-connected to the left half of the flexible sleeve. Multiple first docking blocks and second docking blocks completely fill the separation groove.

[0018] Optionally, a pair of inserts is fixedly installed at the bottom end of the flexible sleeve, and the pair of inserts has a trumpet-shaped structure. The top end of the flexible sleeve contacts the nail column, and an anti-seepage sheet is fixedly installed on the outer wall of the flexible sleeve at the separation groove.

[0019] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0020] The present invention receives the downward thrust of the expansion of the upper concrete slab through the expansion butt joint tube, so that the separation block moves downward to open the multiple expansion blocks. When the holes on the upper concrete slab expand after the expansion, the expansion blocks are used to open the flexible sleeve, thereby reducing the influence of the expansion of the upper concrete slab on the movable range, avoiding the expansion of the holes on the upper concrete slab resulting in an excessively large movable range, causing the two composite beams originally at adjacent positions to squeeze each other, resulting in deformation and damage.

[0021] Furthermore, by designing the pitch of the second thread to be longer than the pitch of the first thread, the long pitch of the second thread allows the sleeve to rotate under force, and the sleeve uses the socket to drive the separation block to rotate synchronously. The short pitch of the first thread is used to improve the stability of the separation block position, avoiding the reaction force exerted by the expansion block on the separation block to cause the separation block to move, thereby improving the stability of the expansion block position.

[0022] Furthermore, the separation groove is completely filled by the first docking block and the second docking block, and the anti-seepage sheet is blocked at the separation groove to prevent the external upper concrete slab from entering the flexible sleeve. The separation groove on the flexible sleeve is used to prevent the expansion block from directly stretching the flexible sleeve, causing the flexible sleeve to deform and lose its elasticity, resulting in the flexible sleeve being unable to movably limit the upper concrete slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of an embodiment of the present invention is provided;

[0024] Figure 2 A schematic diagram of the upper concrete slab structure separation state according to an embodiment of the present invention is provided;

[0025] Figure 3 A schematic diagram of the structure of a flexible sleeve according to an embodiment of the present invention is given;

[0026] Figure 4 A schematic diagram of the expansion block structure of an embodiment of the present invention is given;

[0027] Figure 5 A schematic cross-sectional view of a nail column structure according to an embodiment of the present invention is provided;

[0028] Figure 6 for Figure 5 An enlarged schematic diagram of the second thread structure of part A;

[0029] Figure 7 A schematic diagram of the separation block structure of an embodiment of the present invention is given;

[0030] Figure 8 A schematic diagram of a front and cross-sectional view of a screw sleeve structure according to an embodiment of the present invention is provided;

[0031] Fig. 9 A schematic structural diagram of a first docking block according to an embodiment of the present invention is given.

[0032] 1. Bottom steel plate; 2. Upper concrete plate; 3. Anchor; 31. Cap; 32. Nail column; 33. Expansion docking tube; 34. Insert rod; 35. Separation block; 36. First thread; 37. Extension block; 38. Guide rod; 4. Flexible member; 41. Flexible sleeve; 42. Insert piece; 43. Separation groove; 44. First docking block; 45. Second docking block; 46. Anti-seepage sheet; 5. Resistance member; 51. Screw sleeve; 52. Second thread; 53. Insert plate; 54. Socket; 55. Conversion; 56. Extension tube; 57. Inlay. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0034] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Embodiment 1: This embodiment proposes a composite beam limited slip connection structure, such as Figure 1 and Figure 2 As shown, it includes a bottom steel plate 1 and an upper concrete plate 2. The upper concrete plate 2 is cast on the top of the bottom steel plate 1. An anchor member 3 is arranged between the bottom steel plate 1 and the upper concrete plate 2. The anchor member 3 connects the bottom steel plate 1 and the upper concrete plate 2 together.

[0039] like Figure 4 and Figure 5 As shown, the anchor member 3 includes a nail column 32, a cap 31, an expansion butt tube 33, a separation block 35 and an expansion block 37. The top of the cap 31 is slidably connected to the nail column 32, and the top of the nail column 32 is slidably connected to the expansion butt tube 33 up and down. The expansion butt tube 33 is located at the center of the top of the nail column 32. An embedding groove is provided on the top of the expansion butt tube 33. The cross-section of the embedding groove adopts a convex structure. The upper concrete slab 2 is poured into the embedding groove at the top of the expansion butt tube 33, so that the expansion butt tube 33 is connected to the upper concrete slab 2. When the upper concrete slab 2 is deformed due to temperature, the expansion butt tube 33 moves with the upper concrete slab 2. The cross-section of the embedding groove adopts a convex structure to prevent the concrete from detaching from the embedding groove, thereby improving the connection stability.

[0040] like Figure 5As shown, the top of the expansion butt joint sleeve 33 contacts the upper concrete slab 2, the middle part of the cap 31 is threadedly connected to the separation block 35, a resistance piece 5 is arranged between the bottom of the cap 31 and the separation block 35, and an insertion rod 34 is fixedly installed at the bottom of the expansion butt joint sleeve 33. The cap 31 adopts a T-shaped structure, and a clearance hole is opened in the horizontal part of the nail column 32. The insertion rod 34 passes through the horizontal part of the nail column 32 from the clearance hole. The diameter of the clearance hole is larger than the diameter of the insertion rod 34, and the bottom of the insertion rod 34 is connected to the separation block 35 through the resistance piece 5.

[0041] When the upper concrete slab 2 expands, the expansion butt joint 33 is pushed downward by the expansion of the upper concrete slab 2, and the expansion butt joint 33 moves downward and presses the separation block 35 downward through the first butt joint block 44 and the resistance member 5, and the separation block 35 rotates and moves downward along the cap 31. When the upper concrete slab 2 has been displaced, the insertion rod 34 will not be stuck due to the presence of the horizontal part of the nail column 32.

[0042] like Figure 5 and Figure 7 As shown, the outer wall of the separation block 35 contacts the expansion block 37. A plurality of expansion blocks 37 are provided and are distributed in a circular shape with equal angles along the cap 31. The separation block 35 adopts a hollow truncated cone structure. The plurality of expansion blocks 37 form a cylindrical structure. The arc surface of the separation block 35 fits with the inner wall of the expansion block 37.

[0043] The outer arc surface of the expansion block 37 is provided with a flexible member 4, and the flexible member 4 includes a flexible sleeve 41. The outer arc surface of the expansion block 37 is sleeved with the flexible sleeve 41, and the flexible sleeve 41 is in contact with the upper concrete slab 2. The expansion block 37 is squeezed by the separation block 35 to move it in the direction away from the cap 31, so that the flexible sleeve 41 is stretched open. Since the thermal expansion coefficient of general metal is smaller than that of concrete, under the same temperature change, the length change of concrete is greater than the length change of the metal nail column, resulting in the deformation of the hole on the upper concrete slab 2 being greater than the deformation of the nail column. Therefore, the expansion block 37 is expanded to reduce the impact of the expansion of the hole on the upper concrete slab 2, and to avoid the expansion of the hole on the upper concrete slab 2 causing its movable range to increase, so that the two composite beams originally in adjacent positions are squeezed against each other, resulting in deformation and damage. At the same time, the expansion block 37 stretches the flexible sleeve 41 to make it stick to the upper concrete slab 2, increasing the resistance to the movement of the upper concrete slab 2.

[0044] A plurality of guide rods 38 are fixedly mounted at the middle of the cap 31 . The number of the guide rods 38 is the same as the number of the expansion blocks 37 . The expansion blocks 37 slide on the guide rods 38 , and the guide rods 38 guide the expansion blocks 37 .

[0045] In this embodiment, the expansion docking tube 33 is subjected to the downward thrust caused by the expansion of the upper concrete slab 2, so that the expansion docking tube 33 moves downward and presses the separation block 35 through the first docking block 44 and the resistance member 5. The separation block 35 rotates and moves downward along the cap 31. The separation block 35 opens the multiple expansion blocks 37. When the holes on the upper concrete slab 2 expand after the expansion, the expansion block 37 is used to open the flexible sleeve 41, thereby reducing the influence of the expansion of the upper concrete slab 2 on the movable range, avoiding the expansion of the holes on the upper concrete slab 2 resulting in an excessively large movable range, causing the two composite beams originally in adjacent positions to squeeze each other, resulting in deformation and damage.

[0046] Example 2, based on Example 1, this example proposes a composite beam limited slip connection structure, such as Figure 6 and Figure 8 As shown, the resistance member 5 includes a screw sleeve 51, an insert plate 53 and a conversion 55. The middle part of the cap 31 and located above the separation block 35 is threadedly connected to the screw sleeve 51, the top of the screw sleeve 51 is rotatably connected to the conversion 55, the top of the conversion 55 is fixedly connected to the insertion rod 34, the bottom of the screw sleeve 51 is fixedly installed with the insert plate 53, and a socket 54 is provided on the top of the separation block 35, and the insert plate 53 slides up and down at the socket 54 of the separation block 35.

[0047] The screw sleeve 51 rotates along the second thread 52 , and the second thread 52 drives the separation block 35 to rotate through the insert plate 53 , so that the separation block 35 moves downward in a spiral.

[0048] like Figure 6 As shown, a second thread 52 is provided at the connection between the cap 31 and the screw sleeve 51 , and a first thread 36 is provided at the threaded connection between the cap 31 and the separation block 35 . The second thread 52 is located above the first thread 36 , and the pitch of the second thread 52 is longer than the pitch of the first thread 36 .

[0049] Since the separation block 35 is squeezed by the expansion block 37 using its outer arc surface, the expansion block 37 will exert a reaction force on the separation block 35. The separation block 35 is rotated and moved downward along the first thread 36 to reduce the influence of the reaction force. At the same time, the pitch of the second thread 52 is designed to be longer than the pitch of the first thread 36. The long pitch of the second thread 52 is utilized to allow the screw sleeve 51 to rotate under force. The screw sleeve 51 drives the separation block 35 to rotate synchronously using the jack 54. The short pitch of the first thread 36 is utilized to improve the stability of the position of the separation block 35, thereby preventing the reaction force exerted by the expansion block 37 on the separation block 35 from causing the separation block 35 to move.

[0050] like Figure 8 As shown, an extension tube 56 is fixedly installed at the bottom of the conversion 55, and an inlay 57 is opened on the inner wall of the screw sleeve 51 near the conversion 55. The extension tube 56 rotates at the inlay 57 on the inner wall of the screw sleeve 51, and there is a distance between the extension tube 56 and the inlay 57.

[0051] In this embodiment, the pitch of the second thread 52 is designed to be longer than the pitch of the first thread 36. The long pitch of the second thread 52 allows the screw sleeve 51 to rotate under force. The screw sleeve 51 uses the socket 54 to drive the separation block 35 to rotate synchronously. The short pitch of the first thread 36 is used to improve the stability of the position of the separation block 35, avoid the reaction force exerted by the expansion block 37 on the separation block 35 to cause the separation block 35 to move, that is, improve the stability of the position of the expansion block 37.

[0052] Embodiment 3, based on the above embodiment 1 or 2, this embodiment proposes a composite beam limited slip connection structure, such as Figure 3 and Fig. 9 As shown, the flexible member 4 also includes a separation groove 43, a first docking block 44 and a second docking block 45. Two symmetrically arranged separation grooves 43 are provided on the arc surface of the flexible sleeve 41. The two separation grooves 43 divide the flexible sleeve 41 into two left and right parts. The first docking block 44 is fixedly installed at the separation groove 43 of the right half of the flexible sleeve 41, and the second docking block 45 is fixedly installed at the separation groove 43 of the left half of the flexible sleeve 41. The first docking block 44 and the second docking block 45 both adopt a triangular structure, and the first docking block 44 and the second docking block 45 are staggered at the separation groove 43.

[0053] The first docking block 44 adopts a triangular structure, and a plurality of first docking blocks 44 are provided. The shape and number of the second docking block 45 are the same as those of the first docking block 44. The tips of the first docking block 44 and the second docking block 45 are both provided with rubber balls. The rubber ball at the tip of the second docking block 45 is connected to the right half of the flexible sleeve 41, and the rubber ball at the tip of the first docking block 44 is connected to the left half of the flexible sleeve 41. When the expansion block 37 moves to open the flexible sleeve 41, the rubber ball at the tip of the second docking block 45 and the rubber ball at the tip of the first docking block 44 are separated from the flexible sleeve 41, so as to avoid the flexible sleeve 41 from deforming and losing its elasticity after the expansion block 37 directly opens the flexible sleeve 41, so that the flexible sleeve 41 cannot movably limit the upper concrete slab 2.

[0054] The plurality of first docking blocks 44 and the second docking blocks 45 completely fill the separation groove 43, the bottom end of the flexible sleeve 41 is fixedly installed with a plug-in sheet 42, the plug-in sheet 42 adopts a trumpet-shaped structure, the top end of the flexible sleeve 41 contacts the nail column 32, and the outer wall of the flexible sleeve 41 is fixedly installed at the separation groove 43 with an anti-seepage sheet 46. The anti-seepage sheet 46 further prevents the upper concrete slab 2 from entering the flexible sleeve 41.

[0055] When pouring the upper concrete slab 2 , the separation groove 43 is completely filled by the first docking block 44 and the second docking block 45 to prevent the upper concrete slab 2 from entering the interior of the flexible sleeve 41 , causing the upper concrete slab 2 to restrict the movement of the separation block 35 in the flexible sleeve 41 .

[0056] In this embodiment, the separation groove 43 is completely filled by the first docking block 44 and the second docking block 45, and the anti-seepage sheet 46 is blocked at the separation groove 43 to prevent the external upper concrete slab 2 from entering the flexible sleeve 41. The separation groove 43 on the flexible sleeve 41 is used to prevent the expansion block 37 from directly stretching the flexible sleeve 41, causing the flexible sleeve 41 to deform and lose its elasticity, resulting in the flexible sleeve 41 being unable to movably limit the upper concrete slab 2.

[0057] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A composite beam limited slip connection structure, comprising: A bottom steel plate (1) and an upper concrete plate (2), wherein the upper concrete plate (2) is cast on the top of the bottom steel plate (1), and the method further comprises: An anchor member (3), the anchor member (3) comprising a nail column (32), a cap (31), an expansion butt plug (33), a separation block (35) and an expansion block (37), the top end of the cap (31) being slidably connected to the nail column (32), the top end of the nail column (32) being slidably connected to the expansion butt plug (33) up and down, the top of the expansion butt plug (33) being in contact with an upper concrete slab (2), the middle of the cap (31) being threadedly connected to the separation block (35), a resistance member (5) being provided between the bottom of the cap (31) and the separation block (35), the outer wall of the separation block (35) being in contact with the expansion block (37), a plurality of the expansion blocks (37) being provided and being distributed in a circular shape at equal angles along the cap (31); A flexible member (4), the flexible member (4) comprising a flexible sleeve (41), the outer arc surface of the expansion block (37) being sleeved with the flexible sleeve (41), the flexible sleeve (41) being in contact with the upper concrete slab (2); The top end of the nail column (32) is fixedly connected to the upper concrete slab (2), and the bottom end of the cover cap (31) is fixedly connected to the bottom steel plate (1).

2. The limited slip connection structure of a composite beam according to claim 1, characterized in that: The separation block (35) adopts a hollow truncated cone structure, and the plurality of expansion blocks (37) form a cylindrical structure. The arc surface of the separation block (35) fits the inner wall of the expansion block (37). A plurality of guide rods (38) are fixedly installed at the middle of the cap (31). The number of the guide rods (38) is the same as the number of the expansion blocks (37), and the expansion blocks (37) slide on the guide rods (38).

3. The limited slip connection structure of a composite beam according to claim 1, characterized in that: The expansion butt joint tube (33) is located at the top center of the nail column (32), and an embedding groove is opened on the top of the expansion butt joint tube (33). The cross section of the embedding groove adopts a convex-shaped structure, and the upper concrete slab (2) is poured into the embedding groove on the top of the expansion butt joint tube (33).

4. The limited slip connection structure of a composite beam according to claim 3, characterized in that: The bottom of the expansion butt joint cylinder (33) is fixedly mounted with an insertion rod (34); the cover cap (31) is of a T-shaped structure; the horizontal portion of the nail column (32) is provided with a clearance hole; the insertion rod (34) passes through the horizontal portion of the nail column (32) from the clearance hole; the diameter of the clearance hole is larger than the diameter of the insertion rod (34); and the bottom of the insertion rod (34) is connected to a separation block (35) via a resistance member (5).

5. The limited slip connection structure of a composite beam according to claim 4, characterized in that: The resistance member (5) comprises a screw sleeve (51), an insert plate (53) and a conversion (55); the screw sleeve (51) is threadedly connected to the middle part of the cover cap (31) and located above the separation block (35); the top of the screw sleeve (51) is rotatably connected to the conversion (55); the top of the conversion (55) is fixedly connected to the insert rod (34); the insert plate (53) is fixedly installed on the bottom of the screw sleeve (51); a plug hole (54) is opened on the top of the separation block (35); and the insert plate (53) slides up and down at the plug hole (54) of the separation block (35).

6. The limited slip connection structure of a composite beam according to claim 5, characterized in that: A second thread (52) is provided at the connection between the cover cap (31) and the screw sleeve (51), and a first thread (36) is provided at the threaded connection between the cover cap (31) and the separation block (35). The second thread (52) is located above the first thread (36), and the pitch of the second thread (52) is longer than the pitch of the first thread (36).

7. The limited slip connection structure of a composite beam according to claim 6, characterized in that: An extension tube (56) is fixedly installed at the bottom of the conversion (55), and an inlay (57) is provided on the inner wall of the screw sleeve (51) near the conversion (55). The extension tube (56) rotates at the inlay (57) on the inner wall of the screw sleeve (51), and there is a distance between the extension tube (56) and the inlay (57).

8. The limited slip connection structure of a composite beam according to claim 1, characterized in that: The flexible member (4) further comprises a separation groove (43), a first docking block (44) and a second docking block (45); two symmetrically arranged separation grooves (43) are provided on the arc surface of the flexible sleeve (41); the two separation grooves (43) divide the flexible sleeve (41) into two left and right parts; the first docking block (44) is fixedly installed at the separation groove (43) of the right half of the flexible sleeve (41); the second docking block (45) is fixedly installed at the separation groove (43) of the left half of the flexible sleeve (41); the first docking block (44) and the second docking block (45) both adopt a triangular structure; the first docking block (44) and the second docking block (45) are staggeredly distributed at the separation groove (43).

9. The limited slip connection structure of a composite beam according to claim 8, characterized in that: The first docking block (44) adopts a triangular structure. A plurality of the first docking blocks (44) are provided. The shape and number of the second docking blocks (45) are the same as those of the first docking block (44). The tips of the first docking block (44) and the second docking block (45) are both provided with rubber balls. The rubber ball at the tip of the second docking block (45) is point-connected to the right half of the flexible sleeve (41), and the rubber ball at the tip of the first docking block (44) is point-connected to the left half of the flexible sleeve (41). The plurality of the first docking blocks (44) and the second docking blocks (45) completely fill the separation groove (43).

10. The limited slip connection structure of a composite beam according to claim 9, characterized in that: A counter-insertion sheet (42) is fixedly mounted on the bottom end of the flexible sleeve (41), and the counter-insertion sheet (42) has a trumpet-shaped structure. The top end of the flexible sleeve (41) contacts the nail column (32), and an anti-seepage sheet (46) is fixedly mounted on the outer wall of the flexible sleeve (41) and located at the separation groove (43).

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