Tenon-shaped anti-falling beam device
By utilizing the sliding fit between the tenon and the groove and the multi-stage deformation mechanism in the tenon-shaped anti-fall beam device, the problem of easy fatigue fracture under large external forces is solved, achieving more efficient energy consumption and seismic performance, extending service life and simplifying installation.
Patent Information
- Application Number
- CN202520387744.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Existing tenon-shaped anti-fall beam devices are prone to fatigue fracture due to excessive internal stress when subjected to large external forces, leading to device failure and failing to effectively improve the seismic performance of bridges.
Design a tenon-shaped anti-fall beam device, wherein the first tenon and the second tenon are slidably engaged with the groove of the connector, and undergo a three-stage deformation process: no deformation during no earthquake and minor earthquake, elastic deformation during moderate and major earthquake and limiting displacement, and finally providing damping energy dissipation through plastic deformation to absorb earthquake energy.
It improves the energy consumption capacity of the device, extends its service life, enhances the seismic performance of the bridge, buffers temperature stress, and simplifies the installation process.
Smart Images
Figure CN223805406U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of bridge anti-seismic technology, and particularly provides a tenon-shaped anti-falling beam device. BACKGROUND
[0002] Falling beam is one of the main forms of bridge seismic damage. Under the action of an earthquake, a bridge may fall due to external force, and the falling beam accident not only causes damage to the bridge structure, but also may cause casualties and traffic jams.
[0003] In order to improve the displacement of the beam body when the bridge is subjected to external forces such as earthquakes, in some related technologies, a tenon-shaped anti-falling beam device is arranged between the pier body and the beam body of the bridge to avoid the occurrence of the falling beam phenomenon and to play a damping and energy dissipation effect, thereby improving the anti-seismic performance of the bridge. However, the current tenon-shaped anti-falling beam still has the phenomenon of fatigue fracture due to excessive internal stress of its own structure when subjected to a large external force, thereby causing the anti-falling beam device to fail.
[0004] Correspondingly, there is a need in the art for a new technical solution to solve the above problems. CONTENT OF THE UTILITY MODEL
[0005] The present application aims to solve the above technical problems, i.e., to solve the problem of how to improve the energy dissipation capacity of the anti-falling beam device.
[0006] To this end, the present application provides a tenon-shaped anti-falling beam device, which comprises:
[0007] a first tenon body comprising a first main body portion and a first tenon head connected to one end of the first main body portion;
[0008] a second tenon body comprising a second main body portion and a second tenon head connected to one end of the second main body portion;
[0009] a connecting piece having opposite first and second surfaces, the first surface being provided with a first groove, and the second surface being provided with a second groove, the first tenon head being located in the first groove, and the second tenon head being located in the second groove;
[0010] wherein the first groove extends along a first direction, the second groove extends along a second direction, the first direction intersects the second direction, the first tenon head can slide in the first groove along the first direction, and the second tenon head can slide in the second groove along the second direction.
[0011] In one technical solution of the above tenon-shaped anti-falling beam device, the first direction is perpendicular to the second direction.
[0012] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the first tenon body and the second tenon body both extend along a third direction, and the first direction and the second direction are both perpendicular to the third direction.
[0013] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the first tenon head is a spherical body, and the inner wall surface of the first groove is a curved surface matched with the spherical body.
[0014] The depth of the first groove is greater than the radius of the spherical body, and the opening width of the first groove is less than the diameter of the spherical body, so as to limit the displacement of the first tenon body in the third direction.
[0015] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the second tenon head is a disc-shaped body, and the depth of the second groove is greater than the thickness of the second tenon head, so that the second tenon body can slide in the second groove along the third direction.
[0016] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, a limiting part is arranged at the opening of the second groove, and the limiting part is used to limit the sliding out of the second tenon body from the second groove.
[0017] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the connecting piece comprises a first part and a second part arranged separately, the first part and the second part are detachably connected, and the first part and the second part are buckled to form the first groove and the second groove.
[0018] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the anti-collapse beam device is applied to a T-shaped beam.
[0019] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the anti-collapse beam device further comprises:
[0020] a first flange fixedly connected to the end of the first main body part away from the first tenon head, and the axis of the first main body part has an offset distance relative to the axis of the first flange;
[0021] a second flange fixedly connected to the end of the second main body part away from the second tenon head, and the axis of the second main body part has an offset distance relative to the axis of the second flange.
[0022] In one of the technical solutions of the above-described tenon-shaped anti-collapse beam device, the anti-collapse beam device further comprises:
[0023] a first backing plate used for being installed between the first flange and a beam body;
[0024] a second backing plate used for being installed between the second flange and a pier body.
[0025] In the case of adopting the technical scheme, under the action of the earthquake, the deformation and energy dissipation process of the tenon-shaped anti-falling beam device of the application is divided into three stages: in the first stage, the first tenon body and the first groove, and the second tenon body and the second groove slide relative to each other, at this time, the first tenon body and the second tenon body do not deform; in the second stage, the first tenon body and the second tenon body elastically deform to limit the relative displacement of the beam body and the pier body; in the third stage, on the basis of limiting the relative displacement of the pier and the beam, the plastic deformation of the first tenon body and the second tenon body provides a damping energy dissipation capacity to absorb the seismic energy. As can be seen, through the cooperation of the first tenon body and the first groove and the cooperation of the second tenon body and the second groove, in the case of no earthquake and small earthquake, the first tenon body and the second tenon body do not touch the end of the first groove and the second groove in the connecting piece, and the components do not deform; in the case of medium earthquake and large earthquake, the beam body starts to displace horizontally, the first tenon body and the second tenon body slide to the limit positions of the first groove and the second groove respectively, start to elastically deform, and then plastically deform, to realize the limiting and energy dissipation effect with buffering effect. Compared with the existing tenon-shaped anti-falling beam device, in the tenon-shaped anti-falling beam device of the application, the tenon body enters the yield state earlier, which helps to exert the energy dissipation capacity.
[0026] On the other hand, affected by the temperature difference between seasons and the temperature difference between day and night, the beam body will show thermal expansion and contraction, and under the action of the temperature difference, the beam body will produce a small deformation amount, in this case, the first tenon body can also displace relative to the first groove, and the second tenon body can displace relative to the second groove, thereby buffering the temperature stress. BRIEF DESCRIPTION OF DRAWINGS
[0027] The preferred embodiments of the application will be described below with reference to the accompanying drawings, in which:
[0028] Figure 1 is a schematic view of a tenon-shaped anti-falling beam device according to an embodiment of the application and when it is installed between a beam body and a pier body;
[0029] Figure 2 is a sectional view of Figure 1 ;
[0030] Figure 3 is a schematic view of a connecting piece according to an embodiment of the application;
[0031] Figure 4 is a schematic view of Figure 3 from another perspective (turning Figure 3 180°);
[0032] Figure 5 is a schematic view of the internal structure of the connecting piece;
[0033] Figure 6 is a schematic view of a first flange of the connecting piece according to an embodiment of the application;
[0034] Figure 7 is a schematic view of a first pad plate according to an embodiment of the present application.
[0035] In the drawings, reference numerals refer to the following items:
[0036] 1, first tenon body; 11, first main body part; 12, first tenon head; 13, first flange; 2, second tenon body; 21, second main body part; 22, second tenon head; 23, second flange; 3, connecting piece; 31, first surface; 311, first groove; 32, second surface; 321, second groove; 3211, limiting part; 51, first pad plate; 52, second pad plate;
[0037] 100, beam body; 200, pier body. DETAILED DESCRIPTION
[0038] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application occasions.
[0039] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0040] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0041] Reference Figure 1 and Figure 2 , Figure 1 is a schematic view of a first pad plate according to an embodiment of the present application. Figure 2 is Figure 1 a sectional view. The tenon-shaped anti-falling beam device comprises a first tenon body 1, a second tenon body 2 and a connecting piece 3.
[0042] The first tenon body 1 comprises a first main body part 11 and a first tenon head 12 fixedly connected to one end of the first main body part 11. The second tenon body 2 comprises a second main body part 21 and a second tenon head 22 fixedly connected to one end of the second main body part 21. Optionally, the first tenon head 12 is integrally formed with the first main body part 11, and the second tenon head 22 is integrally formed with the second main body part 21, so as to improve the structural strength of the first tenon body 1 and the second tenon body 2 as a whole.
[0043] In some implementations, the cross sections of the first main body part 11 and the second main body part 21 are circular, and the diameters of the first main body part 11 and the second main body part 21 linearly change along the axial direction, i.e., the first main body part 11 and the second main body part 21 are designed in the shape of a truncated cone, the first tenon head 12 is connected to the small-diameter end of the first main body part 11, the second tenon head 22 is connected to the small-diameter end of the second main body part 21, and the large-diameter ends of the first main body part 11 and the second main body part 21 are respectively used for connecting to the beam body or the pier body. In this way, the first main body part 11 and the second main body part 21 are designed in the shape of a variable cross section with equal strength, so that each cross section can reach yield and enter a plastic working state at the same time when an earthquake occurs. This design can ensure uniform stress distribution of the tenon body during force application, thereby improving the working efficiency and seismic performance thereof.
[0044] With reference to Figure 2 , Figure 3 and Figure 4 , the connecting piece 3 is connected between the first tenon body 1 and the second tenon body 2, and the connecting piece 3 has opposite first and second surfaces 31 and 32. The first surface 31 is provided with a first recess 311, and the second surface 32 is provided with a second recess 321. The first recess 311 extends along a first direction, and the second recess 321 extends along a second direction. As shown in the drawings, the first direction is the X direction in the drawings, and the second direction is the Y direction in the drawings. The first direction is perpendicular to the second direction. The first tenon head 12 is located in the first recess 311 and can reciprocally slide in the first recess 311 along the first direction. The second tenon head 22 is located in the second recess 321 and can reciprocally slide in the second recess 321 along the second direction.
[0045] When the tenon-shaped anti-falling beam device of the present application is installed between the beam body 100 and the pier body 200, the first tenon body 1 and the second tenon body 2 both extend along a third direction, and the first tenon body 1 and the second tenon body 2 are located on the same axis. The third direction is the Z direction in the drawings. It can be seen that the first direction, the second direction and the third direction are perpendicular to each other, the first direction and the second direction are horizontal directions, and the third direction is a vertical direction.
[0046] The tenon-shaped anti-falling beam device of the present application is installed in the following way: the first tenon body 1 is fixedly connected with the beam body, the second tenon body 2 is fixedly connected with the pier body, and the axes of the first tenon body 1 and the second tenon body 2 must coincide, and then the connecting piece 3 is installed between the first tenon head 12 and the second tenon head 22. In this way, during the use of the bridge, when the environment where the bridge is located has no vibration phenomenon, the first tenon body 1 and the second tenon body 2 do not produce deformation and displacement; after the bridge is subjected to the action of vibration, when the beam body produces horizontal displacement, first, the first tenon head 12 slides relative to the first groove 311, and the second tenon head 22 slides relative to the second groove 321, so that the first tenon body 1 and the second tenon body 2 produce displacement relative to the connecting piece 3 in the horizontal plane, at this time, the first tenon head 12 and the second tenon head 22 do not produce deformation; if the bridge continues to vibrate, and the first tenon head 12 has already slid to the limit position of the first groove 311, and the second tenon head 22 has already slid to the limit position of the second groove 321, at this time, the first main body part 11 and the second main body part 21 produce elastic deformation and then plastic deformation under stress.
[0047] Under the action of an earthquake, the deformation and energy dissipation process of the tenon-shaped anti-falling beam device of the present application is divided into three stages: in the first stage, the first tenon body and the first groove, and the second tenon body and the second groove slide relative to each other, at this time, the first tenon body and the second tenon body do not produce deformation; in the second stage, the first tenon body and the second tenon body produce elastic deformation, limiting the relative displacement of the beam body and the pier body; in the third stage, on the basis of limiting the relative displacement of the pier and the beam, the plastic deformation of the first tenon body and the second tenon body provides damping energy dissipation capacity to absorb seismic energy. As can be seen, through the cooperation of the first tenon body and the first groove, and the cooperation of the second tenon body and the second groove, in the case of no vibration and small vibration, the first tenon body and the second tenon body do not touch the end of the first groove and the second groove in the connecting piece, and the components do not produce deformation; in the case of medium vibration and large vibration, the beam body begins to produce horizontal displacement, the first tenon body and the second tenon body slide to the limit positions of the first groove and the second groove respectively, begin to produce elastic deformation, and then produce plastic deformation, realizing the effect of limiting and energy dissipation shock absorption with buffering effect. Compared with the existing tenon-shaped anti-falling beam device, in the tenon-shaped anti-falling beam device of the present application, the tenon body enters the yield state earlier, which helps to exert the energy dissipation capacity.
[0048] It should be noted that the extension direction of the first groove 311 and the extension direction of the second groove 321 are perpendicular to each other, in order to enable the first tenon body 1 and the second tenon body 2 to buffer the action force (vibration force in the first direction makes the first tenon body 1 slide relative to the first groove 311, and vibration force in the second direction makes the second tenon body 2 slide relative to the second groove 321) in any direction in the horizontal plane, which is only one preferred scheme of the present application, and is not a limitation on the present application, as long as the extension direction of the first groove 311 and the extension direction of the second groove 321 intersect, the above effect can be achieved.
[0049] It should be noted that the cooperation between the first tenon body 1 and the first groove 311 and the cooperation between the second tenon body 2 and the second groove 321 not only reflects the aspect of buffering the vibration force, but also can buffer the temperature stress. That is, due to the influence of the temperature difference between seasons and the temperature difference between day and night, the beam body will present the thermal expansion and cold contraction phenomenon, and under the action of the temperature difference, the beam body will generate a small deformation amount. In this case, the first tenon body 1 can also displace relative to the first groove 311, and the second tenon body 2 can displace relative to the second groove 321, thereby buffering the temperature stress.
[0050] With reference to Figure 2 , Figure 3 and Figure 4 , in an embodiment of the present application, the first tenon head 12 is a spherical body, and the inner wall surface of the first groove 311 is a curved surface matched with the spherical body. Specifically, the inner wall surface of the middle section of the first groove 311 is an arc surface, the curvature of the arc surface is matched with the curvature of the outer surface of the spherical body, and the inner wall surfaces of the two ends of the first groove 311 are spherical surfaces matched with the spherical body. In this way, the first tenon head 12 can slide along the first groove 311 and fit with the inner wall of the first groove 311 at the “limit position” of the two ends of the first groove 311. In this process, the fitting area between the first tenon head 12 and the first groove 311 can be maximized, thereby not only improving the stability of the sliding process of the first tenon head 12, but also reducing the stress concentration phenomenon between the contact positions of the first tenon head 12 and the first groove 311.
[0051] At the same time, the depth of the first groove 311 is greater than the radius of the first tenon head 12, and the opening width of the first groove 311 is less than the diameter of the first tenon head 12, so that the first groove 311 can “wrap” the first tenon head 12 and limit the displacement of the first tenon head 12 relative to the first groove 311 in the third direction.
[0052] In this way, in the case of using the above technical solutions, the first tenon body 1 and the connecting piece 3 are relatively fixed in the third direction, thereby limiting the displacement of the connecting piece 3 in the third direction. At the same time, the first tenon head 12 and the first groove 311 are in spherical surface contact. After the bridge is subjected to the vibration force, the first tenon head 12 can not only slide in the first groove 311, but also rotate relative to the first groove 311, thereby buffering the horizontal torsion force, improving the stress concentration phenomenon, and improving the durability of the device.
[0053] In an embodiment of the present application, the second tenon 22 is provided in a disc shape, and correspondingly, the second groove 321 is provided with a rectangular cross section in the middle section and a semicircular cross section at both ends, so that the second tenon 22 can rotate relative to the second groove 321 to buffer the horizontal torsion. On the other hand, the second tenon 22 is provided in a disc shape, so that the axial force (i.e. the force in the third direction) acting on the second tenon 22 can be dispersed to the surface of the disc, reducing the stress concentration phenomenon and improving the durability of the device.
[0054] Further, the depth of the second groove 321 is greater than the thickness of the second tenon 22, so that when the bridge is subjected to a vertical vibration force, the second tenon 22 can slide in the vertical direction (i.e. the third direction) in the second groove 321, thereby buffering the vertical vibration force and preventing the tenon-shaped anti-collapse beam device from failing due to long-term vertical tension, so as to improve the energy dissipation capacity of the tenon-shaped anti-collapse beam device and prolong its service life.
[0055] In order to prevent the second tenon 22 from sliding out of the second groove 321 during vertical sliding, a limiting portion 3211 is provided at the opening of the second groove 321. The limiting portion 3211 can be integrally formed with the connecting piece 3, and can be in the form of a ring structure or a plurality of protrusions arranged at intervals. The present application does not limit this, as long as the second tenon 22 can be limited from sliding downward out of the second groove 321.
[0056] In some embodiments of the present application, the inner walls of the first groove 311 and the second groove 321 are provided with a friction-reducing layer, which can be, for example, a polytetrafluoroethylene plate or the like, for reducing the friction coefficients between the first tenon 12 and the first groove 311 and between the second tenon 22 and the second groove 321, so that the sliding process of the first tenon 12 and the second tenon 22 is smoother.
[0057] In some embodiments of the present application, the hardness and / or modulus of the first body portion 11 and the second body portion 21 are less than the hardness and / or modulus of the first tenon 12 and the second tenon 22, so that during the vibration of the beam body, the first body portion 11 and the second body portion 21 can be elastically deformed and plastically deformed to consume vibration energy, and at the same time, prevent the first tenon 12 and the second tenon 22 from being plastically deformed too early due to excessive force, thereby causing them to be unable to slide.
[0058] In other implementations, a surface treatment technology such as laser cladding can also be used to locally strengthen the surface of the first tenon 12 and the second tenon 22, so as to further strengthen their ability to resist plastic deformation.
[0059] Reference Figure 5The connector 3 includes a first part and a second part that are separately configured, and the first part and the second part are detachably connected (e.g., by using...). Figure 5 As shown, wing plates are respectively provided on the first part and the second part, and the first part and the second part are connected by connecting parts such as bolts passing through the wing plates. Thus, during the installation of the tenon-shaped anti-fall beam, after adjusting the relative positions of the first tenon 1 and the second tenon 2, the first part and the second part are moved towards each other and fastened together. After fastening, the first groove 311 and the second groove 321 are formed, which surround the first tenon 12 and the second tenon 22. Then the first part and the second part are fixed.
[0060] Reference Figure 2 and Figure 6 The first body portion 11 is fixedly connected to a first flange 13 at the end away from the first tenon 12, and the second body portion 21 is fixedly connected to a second flange 23 at the end away from the second tenon 22. The axis of the first body portion 11 is offset relative to the axis of the first flange 13, and the axis of the second body portion 21 is offset relative to the axis of the second flange 23. In some technical terms, the first flange 13 and the second flange 23 are also referred to as "eccentric flanges".
[0061] The first flange 13 and the second flange 23 are respectively used to connect to the anchoring steel plates on the surface of the beam or pier. Due to the "eccentric" setting of the first flange 13 and the second flange 23, during the installation of the first tenon 1 and the second tenon 2, the position of the first main body 11 can be adjusted by rotating the first flange 13, and the position of the second main body 21 can be adjusted by rotating the second flange 23, so that the axis of the first main body 11 and the axis of the second main body 21 coincide, making the installation of the tenon-shaped anti-fall beam device more convenient and improving the installation efficiency.
[0062] Reference Figure 2 and Figure 7 The tenon-shaped anti-fall beam device of this application also includes a first pad 51 and a second pad 52. The first pad 51 is installed between the first flange 13 and the beam body (specifically, the anchoring steel plate on the lower surface of the beam body), and the second pad 52 is installed between the second flange 23 and the pier body (specifically, the anchoring steel plate on the upper surface of the pier body). The first pad 51, the second pad 52, the first flange 13 and the second flange 23 have the same diameter. The first pad 51 and the second pad 52 are used to adjust the position of the first tenon 1 and the second tenon 2 in the vertical direction, respectively.
[0063] In different application scenarios, the vertical distance between the beam body and the pier body is different, so it is necessary to adjust the distance between the first tenon 12 and the second tenon 22, so that when the connecting piece 3 is installed, the first tenon 12 can be located in the first groove 311, and the second tenon 22 can be located in the second groove 321. Therefore, the vertical height of the first tenon 12 can be adjusted by arranging the first gusset plate 51 between the first flange 13 and the beam body, and the vertical height of the second tenon 22 can be adjusted by arranging the second gusset plate 52 between the second flange 23 and the pier body, so that the distance between the first tenon 12 and the second tenon 22 meets the set distance, so that the versatility of the tenon-shaped anti-falling beam device can be improved, and different models of tenon-shaped anti-falling beam devices do not need to be processed according to different application scenarios.
[0064] It can be understood that the first gusset plate 51 and the second gusset plate 52 can be provided in multiple numbers according to actual needs, and the specific number of the first gusset plate 51 and the second gusset plate 52 is appropriate to meet the distance requirement.
[0065] Finally, it should be noted that, compared with the existing tenon-shaped anti-falling beam device, the tenon-shaped anti-falling beam device of the present application can be applied to a T-shaped beam, thereby enhancing the applicability of the tenon-shaped anti-falling beam device.
[0066] In addition, the connecting piece 3 is assembled based on the split setting of the connecting piece 3 and the "eccentric setting" of the first flange 13 and the second flange 23, compared with the existing anti-falling beam device, not only simplifies the structure of the tenon-shaped anti-falling beam device, but also improves the installation precision and simplifies the installation process.
[0067] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without deviating from the principles of the present application, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical solutions after these changes or replacements will fall within the protection scope of the present application.
Claims
1. A mortise-type fall protection device, characterized by, The application relates to a fall-preventing beam device. The first tenon body (1) comprises a first main body part (11) and a first tenon head (12) connected to one end of the first main body part (11); the second tenon body (2) comprises a second main body part (21) and a second tenon head (22) connected to one end of the second main body part (21); and the connecting piece (3) has opposite first and second surfaces (31 and 32), the first surface (31) is provided with a first groove (311), the second surface (32) is provided with a second groove (321), the first tenon head (12) is located in the first groove (311), and the second tenon head (22) is located in the second groove (321). The first groove (311) extends along a first direction, the second groove (321) extends along a second direction, the first direction intersects the second direction, the first tenon head (12) can slide in the first groove (311) along the first direction, and the second tenon head (22) can slide in the second groove (321) along the second direction. The first direction is perpendicular to the second direction. The first tenon body (1) and the second tenon body (2) both extend along a third direction, and the first direction and the second direction are both perpendicular to the third direction.
2. The fall prevention device of claim 1, wherein, The first tenon head (12) is a spherical body, and the inner wall surface of the first groove (311) is a curved surface matched with the spherical body.
3. The fall prevention device of claim 2, wherein, The depth of the first groove (311) is greater than the radius of the spherical body, and the opening width of the first groove (311) is smaller than the diameter of the spherical body, so as to limit the displacement of the first tenon body (1) in the third direction.
4. The fall prevention device of claim 3, wherein, The second tenon head (22) is disc-shaped, and the depth of the second groove (321) is greater than the thickness of the second tenon head (22), so that the second tenon body (2) can slide in the second groove (321) along the third direction. The opening of the second groove (321) is provided with a limiting part (3211) for limiting the second tenon body (2) from sliding out of the second groove (321).
5. The fall prevention device of claim 3, wherein, The connecting piece (3) comprises a first part and a second part arranged in two parts, the first part is detachably connected with the second part, and the first part and the second part are buckled to form the first groove (311) and the second groove (321).
6. The fall prevention device of claim 5, wherein, The fall-preventing beam device is applied to a T-shaped beam.
7. The anti-collapse device of claim 1, wherein The fall-preventing beam device further comprises:
8. The fall prevention device of claim 1, wherein, A first flange (13) fixedly connected to the end of the first main body part (11) away from the first tenon head (12), and the axis of the first main body part (11) has an offset distance relative to the axis of the first flange (13); 9. The anti-collapse device of any one of claims 1 to 8, wherein, A second flange (23) fixedly connected to the end of the second main body part (21) away from the second tenon head (22), and the axis of the second main body part (21) has an offset distance relative to the axis of the second flange (23). The fall-preventing beam device further comprises: A first pad plate (51) used for being mounted between the first flange (13) and a beam body (100).
10. The fall prevention device of claim 9, wherein, A second backing plate (52) for mounting between the second flange (23) and the pier (200).