A combined support structure for lateral earthquake resistance of long-span bridges

Abstract

The present invention discloses a combined support structure for transverse earthquake resistance of a long-span bridge, which relates to the field of transverse earthquake resistance of bridges, and includes a support block and a bearing assembly, wherein a horizontal block is fixedly installed on the top of the support block, and the bearing assembly is slidably installed at both ends of the horizontal block, and the cross section of the support block and the bearing assembly assembly is T-shaped, and a triangular reinforcement plate is provided at the intersection of the horizontal block and the support block, and the bearing assembly includes a bearing frame, an interception cable and a counterweight block. The present invention docks with the bridge through the bearing assembly, and the support block is connected to the bridge pier. When performing transverse earthquake resistance, as the counterweight block continues to move, it will continuously contact with the interception assembly and generate friction, and the interception assembly is restricted on the support block by the reset assembly, and the pulling force of the reset assembly on the interception assembly can be synchronously transmitted to the counterweight block, thereby increasing the friction coefficient between the counterweight block and the interception assembly, and further improving the earthquake resistance effect.

Description

Technical Field

[0001] The invention relates to the technical field of transverse earthquake resistance of bridges, and in particular to a combined support structure for transverse earthquake resistance of long-span bridges. Background Art

[0002] A large-span bridge refers to a type of bridge with a relatively large bridge deck span. Usually, the length of its main span exceeds 150 meters, and can even reach hundreds of meters or longer. Large-span bridges are mainly used to cross rivers, canyons, roads or other obstacles. When building large-span bridges, seismic-resistant structures will be designed to ensure the safety and stability of the large-span bridge under lateral earthquakes.

[0003] For example, "A combined support structure for lateral seismic resistance of three-span bridges" with publication number CN114016396B includes bridge piers, placement grooves, side piers and trapezoidal shock-absorbing grooves. A trapezoidal shock-absorbing groove is installed on the top of the pier, a placement groove is installed on the top of the trapezoidal shock-absorbing groove, and a bridge plate is installed on the upper end surface of the placement groove. Side piers are arranged on both sides of the pier, and a lateral shock-absorbing mechanism is installed on the top of the side piers. A shock-absorbing seat is installed inside the trapezoidal shock-absorbing groove, a trapezoidal shock-absorbing block is installed on the top of the shock-absorbing seat, and a longitudinal shock-absorbing mechanism is equidistantly installed on the top of the trapezoidal shock-absorbing block. Rubber shock-absorbing bearings are installed on both sides of the surface of the pier, and a buffer mechanism is connected and installed between the rubber shock-absorbing bearing and the side piers.

[0004] However, in the prior art, in modern bridge engineering, long-span bridges are particularly large and heavy due to their huge volume and mass compared to traditional bridge designs. Due to their huge size, long-span bridges exhibit greater inertia when subjected to external forces such as wind and earthquake forces. This inertia makes the stability of the bridge when subjected to lateral shear forces an issue that cannot be ignored. Traditional bridge support structures often seem powerless when facing such long-span bridges. Due to the limitations of their design and materials, these traditional support structures cannot provide sufficient stability guarantees when facing huge lateral shear forces, which may cause the bridge to experience unstable phenomena such as shaking and vibration during use, and in severe cases may even cause damage to the bridge structure, thereby affecting its normal use function and may even cause serious safety accidents. Summary of the invention

[0005] The purpose of the present invention is to provide a combined support structure for lateral seismic resistance of large-span bridges, so as to solve the problem proposed in the above background technology that the inertia of large-span bridges is greater than that of traditional bridges. When subjected to lateral shear force, the stability of traditional support structures cannot be guaranteed, and the bridge is prone to instability. In severe cases, it may directly lead to the problem that the bridge cannot be used normally.

[0006] To achieve the above object, the present invention provides the following technical solution: A combined support structure for lateral seismic resistance of long-span bridges, including a support block and a load-bearing component. A horizontal block is fixedly installed at the top of the support block. The load-bearing component is slidably installed at both ends of the horizontal block. The cross-section of the combination of the support block and the load-bearing component is T-shaped. A triangular reinforcement plate is provided at the junction of the horizontal block and the support block.

[0007] The load-bearing component includes a load-bearing frame, an interception cable, and a counterweight block. One end of the interception cable is fixedly connected to the bottom of the load-bearing frame, and the other end of the interception cable is fixedly connected to the top of the counterweight block. The counterweight block is slidably connected inside the support block. The counterweight block is a solid metal block with one side being arc-shaped.

[0008] A guiding chute is opened at the junction of the support block and the counterweight block. An interception component is movably installed at the notch of the guiding chute. The arc surface of the counterweight block is slidably connected to one side of the interception component. The interception component is arranged linearly along the outer wall of the support block. One end of the interception component is rotatably connected to a reset component, and the reset component is movably installed inside the support block.

[0009] Preferably, the interception component includes an interception block. A first bent rod is fixedly connected to one side of the interception block, and a second bent rod is fixedly connected to the other side of the interception block. One end of the first bent rod and one end of the second bent rod are both inserted into the support block.

[0010] Preferably, a connection head is fixedly installed at one end of the second bent rod. The top view cross-section of the combination of the interception block, the first bent rod, and the second bent rod is in a E shape.

[0011] Preferably, the reset component includes a connection plate and a docking rod. The docking rod is slidably installed linearly and equidistantly on one side of the connection plate. The other end of the docking rod is inserted into the support block. The docking rod is perpendicular to the first bent rod and the second bent rod.

[0012] Preferably, a positioning piece is fixedly installed at one end of the docking rod. Transmission rods are rotatably connected to both the upper and lower sides of the positioning piece. The other end of the transmission rod is rotatably connected to the connection head.

[0013] Preferably, through holes are opened at the junctions of the support block with the docking rod, the first bent rod, and the second bent rod, and the multiple through holes are interconnected. The transmission rod is located at the intersection of the through holes.

[0014] Preferably, a cavity is opened on the wall of the longitudinally arranged through hole. A limiting plate is fixedly installed at one end of the docking rod. The shape of the limiting plate is adapted to the shape of the cavity, and the limiting plate is lapped at one end of the cavity.

[0015] Preferably, a return spring is fixedly mounted on the inner wall of the cavity, one end of the return spring is fixedly connected to the limit plate, and the return spring is sleeved on the outer wall of the docking rod.

[0016] Preferably, positioning side plates are fixedly mounted on both sides of the horizontal block, one end of the supporting frame is inserted into the interior of the positioning side plate, and a receiving groove is provided at the junction of the supporting frame and the horizontal block.

[0017] Preferably, a positioning rod is fixedly mounted on the inner wall of the guide slide groove, the intercepting rope is overlapped on the positioning rod, and an extension plate is fixedly mounted on the top of the supporting frame.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In the present invention, the load-bearing component is connected to the bridge, and the support block is connected to the pier. When performing lateral earthquake resistance, the lateral tension, whether acting on the load-bearing component or the support block, will force the load-bearing component to move. When the load-bearing component moves, it will drive the counterweight block through the interception cable. The gravity of the counterweight block itself can pull the load-bearing component through the interception cable, first achieving a preliminary earthquake resistance effect. Subsequently, in the process of the interception cable pulling the counterweight block, the friction between the counterweight block and the interception component can also play a role in earthquake resistance. As the counterweight block continues to move, it will continuously contact and generate friction with the interception component. In the process of the interception component being restricted and fixed on the support block by the reset component, the tension applied by the reset component to the interception component can be synchronously transmitted to the counterweight block. This synchronous transmission mechanism ensures that the friction coefficient between the counterweight block and the interception component is effectively improved. In this way, the earthquake resistance effect can be further enhanced to ensure the stability and safety of the entire system.

[0020] 2. In the present invention, the interception block completely covers the notch of the guide slot, ensuring its close contact with the counterweight block. Under this structure, when the lateral shear force is relatively small, the friction between the interception block and the counterweight block is sufficient to effectively prevent the movement of the counterweight block. The existence of this friction provides a basic stability guarantee for the entire system. However, when the lateral shear force becomes too large, the counterweight block will continue to contact the interception block during the movement. This continuous contact ensures that the counterweight block will always maintain close contact with the interception block during the rising process, which not only ensures that the counterweight block can still be effectively controlled under extreme conditions, but also greatly enhances the seismic performance of the entire system. The interception component can always maintain its functional stability and reliability under different lateral shear forces. Whether it is a small lateral movement or a large vibration, the interception component can effectively control the movement of the counterweight block through the contact and friction between the interception block and the counterweight block, thereby ensuring the seismic performance of the entire structure.

[0021] 3. In the present invention, under normal operation, the main function of the reset component is to ensure that the interception component is in the correct state. It ensures that the interception component is always in a standby state by maintaining continuous contact with the interception component. In addition, the reset component has an important function, that is, after a vibration or impact occurs, it can achieve repositioning and resetting of the interception component by pushing the connecting component. This process enables the interception component to be reused, thereby improving the reliability and economy of the overall system. The reset component contains a reset spring, which plays a key role in the reset process. When reset is required, the reset spring will be compressed and then release energy at the appropriate time, applying tension to the docking rod through the transmission rod. A transmission rod is installed at the end of the docking rod, and this transmission rod can effectively pull the second bending rod. Through this mechanical linkage, the reset component can ensure that the interception component remains stable after reset, thereby ensuring the effectiveness and safety of the interception system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a combined support structure for lateral earthquake resistance of a long-span bridge according to the present invention;

[0023] Figure 2 A schematic diagram of the structural disassembly of a combined support structure for lateral earthquake resistance of a long-span bridge according to the present invention;

[0024] Figure 3 This is a schematic diagram of the planar structure of a support block of a combined support structure for lateral earthquake resistance of a long-span bridge according to the present invention;

[0025] Figure 4 A side view of a combined support structure for lateral earthquake resistance of a long-span bridge according to the present invention;

[0026] Figure 5 This is a schematic diagram of the connection and structure of an interception component and a reset component of a combined support structure for transverse seismic resistance of a long-span bridge according to the present invention;

[0027] Figure 6 A top view of an interception component and a reset component of a combined support structure for transverse earthquake resistance of a long-span bridge according to the present invention;

[0028] Figure 7 For the present invention Figure 5 A schematic diagram of the structure of part A in the middle;

[0029] Figure 8 For the present invention Figure 6 Schematic diagram of the enlarged structure of part B.

[0030] In the figure: 1. support block; 2. horizontal block; 3. bearing assembly; 4. interception assembly; 5. reset assembly; 6. positioning side plate; 7. triangular reinforcement plate; 8. positioning rod; 9. guide slide groove; 10. cavity; 11. through hole; 31. bearing frame; 32. receiving groove; 33. extension plate; 34. interception rope; 35. counterweight block; 41. interception block; 42. first bending rod; 43. second bending rod; 44. connector; 51. connecting plate; 52. docking rod; 53. positioning sheet; 54. transmission rod; 55. limit plate; 56. reset spring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown: a combined support structure for transverse earthquake resistance of a long-span bridge, comprising a support block 1 and a bearing assembly 3, a horizontal block 2 is fixedly installed on the top of the support block 1, and the bearing assembly 3 is slidably installed at both ends of the horizontal block 2, the cross section of the assembly of the support block 1 and the bearing assembly 3 is T-shaped, and a triangular reinforcement plate 7 is provided at the intersection of the horizontal block 2 and the support block 1;

[0033] The bearing assembly 3 includes a bearing frame 31, an intercepting cable 34 and a counterweight 35. One end of the intercepting cable 34 is fixedly connected to the bottom of the bearing frame 31, and the other end of the intercepting cable 34 is fixedly connected to the top of the counterweight 35. The counterweight 35 is slidably connected to the inside of the support block 1. The counterweight 35 is a solid metal square with one side being curved.

[0034] A guide slot 9 is provided at the junction of the support block 1 and the counterweight block 35, and an interception component 4 is movably installed at the notch of the guide slot 9. The arc surface of the counterweight block 35 is slidably connected to one side of the interception component 4. The interception component 4 is arranged linearly along the outer wall of the support block 1. One end of the interception component 4 is rotatably connected to a reset component 5, and the reset component 5 is movably installed inside the support block 1.

[0035] Positioning side plates 6 are fixedly installed on both sides of the horizontal block 2, one end of the supporting frame 31 is inserted into the inside of the positioning side plate 6, a receiving groove 32 is opened at the intersection of the supporting frame 31 and the horizontal block 2, a positioning rod 8 is fixedly installed on the inner wall of the guide slide groove 9, and the intercepting rope 34 is overlapped on the positioning rod 8, and an extension plate 33 is fixedly installed on the top of the supporting frame 31.

[0036] In this embodiment, the bearing frame 31 in the bearing assembly 3 is connected to the bridge, and the receiving groove 32 in the bearing frame 31 is used to receive the horizontal block 2. The upper surface of the horizontal block 2 can be against the lower surface of the bridge to ensure the overall structural stability. The extension plate 33 on its side is connected to the supporting structure at the bottom of the bridge. Positioning side plates 6 are provided on both sides of the horizontal block 2 to determine the position of the bearing frame 31. The support block 1 is connected to the bridge pier.

[0037] When the bridge vibrates laterally, the two bearing assemblies 3 will be driven at the same time. The counterweight 35 in one of the bearing assemblies 3 will continue to fall, while the counterweight 35 in the other bearing assembly 3 will be driven upward by the interception cable 34. A triangular reinforcement plate 7 is provided between the horizontal block 2 and the support block 1 to improve the overall structural strength and ensure that the support structure can bear the weight of the bridge. The gravity of the counterweight 35 itself can pull the bearing frame 31 through the interception cable 34, first achieving a preliminary earthquake resistance effect.

[0038] The counterweight block 35 is arranged in the guide slot 9, and an interception component 4 for preventing the counterweight block 35 from moving is arranged at the notch of the guide slot 9. The interception component 4 is in direct contact with the counterweight block 35. No matter whether the counterweight block 35 moves up or down, it will generate friction with the interception component 4, and the purpose of preventing the movement of the bearing component 3 is achieved by generating friction. As the counterweight block 35 continues to move, it will continuously contact and generate friction with the interception component 4, and the interception component 4 is restricted on the support block 1 by the reset component 5. The pulling force of the reset component 5 on the interception component 4 can be synchronously transmitted to the counterweight block 35, so as to increase the friction coefficient between the counterweight block 35 and the interception component 4, and further improve the anti-seismic effect. The two interception components 4 are connected to the reset component 5 at the same time to ensure their own stability.

[0039] Embodiment 2: According to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8As shown in the figure, the interception component 4 includes an interception block 41. One side of the interception block 41 is fixedly connected to a first bent rod 42, and the other side of the interception block 41 is fixedly connected to a second bent rod 43. One end of the first bent rod 42 and one end of the second bent rod 43 are both inserted into the inside of the support block 1. One end of the second bent rod 43 is fixedly installed with an adapter head 44. The top view cross-section of the combination of the interception block 41, the first bent rod 42, and the second bent rod 43 is in a 彐 shape.

[0040] In this embodiment, the interception block 41 is in contact with the counterweight block 35. The surface of the counterweight block 35 in contact with the interception block 41 is an arc surface. During its movement, a greater frictional force can be generated with the interception block 41. Both the first bent rod 42 and the second bent rod 43 on both sides of the interception block 41 are inserted into the inside of the support block 1. During the process of the counterweight block 35 moving and forcing the first bent rod 42 and the second bent rod 43 to be pulled out of the support block 1, the friction between the first bent rod 42 and the second bent rod 43 and the support block 1 can increase the resistance to the counterweight block 35. The adapter head 44 is used to connect to the reset component 5;

[0041] When the lateral shear force is relatively small, the frictional force between the interception block 41 and the counterweight block 35 can serve the purpose of preventing the counterweight block 35 from moving. When the lateral shear force is too large, the counterweight block 35 will continuously contact the interception block 41 during the movement process, ensuring that the counterweight block 35 will always be in contact with the interception block 41 during the rising process, thus ensuring the continuity and stability of earthquake resistance.

[0042] Embodiment Three: According to Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8As shown, the reset assembly 5 includes a connection plate 51 and a docking rod 52, the docking rod 52 is linearly and equidistantly slidably installed on one side of the connection plate 51, the other end of the docking rod 52 is inserted into the interior of the support block 1, the docking rod 52 and the first bending rod 42 and the second bending rod 43 are perpendicular to each other, one end of the docking rod 52 is fixedly installed with a positioning piece 53, the upper and lower sides of the positioning piece 53 are rotatably connected with a transmission rod 54, the other end of the transmission rod 54 is rotatably connected to the connector 44, the support block 1 and the docking rod 52, the first bending rod 42 and the second bending rod 43 are rotatably connected. Through holes 11 are provided at the intersections of the rods 43, and the multiple through holes 11 are interconnected. The transmission rod 54 is located at the intersection of the through holes 11. A cavity 10 is provided on the wall of the longitudinally arranged through hole 11. A limit plate 55 is fixedly installed at one end of the docking rod 52. The shape of the limit plate 55 is adapted to the shape of the cavity 10. The limit plate 55 is overlapped at one end of the cavity 10. A return spring 56 is fixedly installed on the inner wall of the cavity 10. One end of the return spring 56 is fixedly connected to the limit plate 55, and the return spring 56 is sleeved on the outer wall of the docking rod 52.

[0043] In this embodiment, the docking rod 52 in the reset assembly 5 is slidably installed in the connection plate 51, and the other end of the docking rod 52 is rotatably connected to the second bending rod 43 through the transmission rod 54. During the movement of the second bending rod 43, the docking rod 52 is pushed by the transmission rod 54, and the existence of the positioning piece 53 provides sufficient activity space for the transmission rod 54.

[0044] When the transmission rod 54 pushes the docking rod 52, the limit plate 55 on the outer wall of the docking rod 52 compresses the return spring 56 in the cavity 10. The elastic force of the return spring 56 can generate a certain amount of resistance to the limit plate 55, thereby achieving the purpose of reducing the displacement of the docking rod 52, so that the interception block 41 will not be pushed out too far, and the pressure of the interception block 41 on the counterweight block 35 is increased;

[0045] The through holes 11 are used to install the docking rod 52, the first bending rod 42 and the second bending rod 43, and there is enough space at the intersection of the plurality of through holes 11 to accommodate the transmission rod 54, and provide sufficient activity space for the transmission rod 54;

[0046] After the earthquake, the connecting plate 51 is pushed to reset each docking rod 52 so that the interception assembly 4 can be reused. The reset spring 56 in the reset assembly 5 can pull the docking rod 52, and the transmission rod 54 at the end of the docking rod 52 is used to pull the second bending rod 43, thereby ensuring the stability of the interception assembly 4.

[0047] The use method and working principle of the device are as follows: the support block 1 is installed on the bridge pier, the bearing frame 31 in the bearing assembly 3 is connected to the bridge, and the extension plate 33 on its side is connected to the supporting structure at the bottom of the bridge. The upper surface of the horizontal block 2 is against the lower surface of the bridge, and positioning side plates 6 are provided on both sides to determine the position of the bearing frame 31. The receiving groove 32 in the bearing frame 31 is used to accommodate the horizontal block 2, and a triangular reinforcement plate 7 is provided at the intersection of the horizontal block 2 and the support block 1 to ensure the strength of the overall structure.

[0048] When the bridge vibrates laterally, the two bearing assemblies 3 will be driven at the same time. The counterweight 35 in one bearing assembly 3 will continue to fall, while the counterweight 35 in the other bearing assembly 3 will be driven upward by the interception cable 34. Whether the counterweight 35 moves up or falls, it will generate high-intensity friction with the interception block 41 in the interception assembly 4, thereby achieving the purpose of preventing the bearing assembly 3 from moving by generating friction.

[0049] The two interception components 4 are connected to the reset component 5. The elastic force of the reset spring 56 in the reset component 5 can push the limit plate 55 to the end of the cavity 10, thereby ensuring that the interception block 41 will not be pushed out too far by the counterweight block 35, thereby increasing the pressure of the interception block 41 on the counterweight block 35;

[0050] And during the movement of the counterweight block 35, the intercepting block 41 will force the first bent rod 42 and the second bent rod 43 to be pulled out from the support block 1. During this process, the friction between the first bent rod 42 and the second bent rod 43 and the support block 1 can increase the resistance to the counterweight block 35 and further enhance the seismic resistance.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined support structure for transverse seismic resistance of a long-span bridge, characterized in that: It includes a support block (1) and a bearing assembly (3). A horizontal block (2) is fixedly installed at the top of the support block (1). The bearing assembly (3) is slidably installed at both ends of the horizontal block (2). The cross-section of the combination of the support block (1) and the bearing assembly (3) is T-shaped. A triangular reinforcement plate (7) is provided at the junction of the horizontal block (2) and the support block (1). The bearing assembly (3) includes a bearing frame (31), an interception cable (34), and a counterweight block (35). One end of the interception cable (34) is fixedly connected to the bottom of the bearing frame (31), and the other end of the interception cable (34) is fixedly connected to the top of the counterweight block (35). The counterweight block (35) is slidably connected inside the support block (1). The counterweight block (35) is a solid metal block with one side being arc-shaped. A guiding chute (9) is opened at the junction of the support block (1) and the counterweight block (35). An interception assembly (4) is movably installed at the notch of the guiding chute (9). The arc surface of the counterweight block (35) is slidably connected to one side of the interception assembly (4). The interception assembly (4) is arranged linearly along the outer wall of the support block (1). One end of the interception assembly (4) is rotatably connected to a reset assembly (5), and the reset assembly (5) is movably installed inside the support block (1). The interception assembly (4) includes an interception block (41). A first bent rod (42) is fixedly connected to one side of the interception block (41). A second bent rod (43) is fixedly connected to the other side of the interception block (41). One end of the first bent rod (42) and one end of the second bent rod (43) are both inserted inside the support block (1). One end of the second bent rod (43) is fixedly installed with an adapter head (44). The top view cross-section of the combination of the interception block (41), the first bent rod (42), and the second bent rod (43) is in a E shape. The reset assembly (5) includes an adapter plate (51) and a docking rod (52). The docking rod (52) is slidably installed linearly and equidistantly on one side of the adapter plate (51). The other end of the docking rod (52) is inserted inside the support block (1). The docking rod (52) is perpendicular to the first bent rod (42) and the second bent rod (43). One end of the docking rod (52) is fixedly installed with a positioning piece (53). Transmission rods (54) are rotatably connected to both the upper and lower sides of the positioning piece (53). The other end of the transmission rod (54) is rotatably connected to the adapter head (44). Through holes (11) are opened at the junctions of the support block (1) with the docking rod (52), the first bent rod (42), and the second bent rod (43), and the multiple through holes (11) are interconnected. The transmission rod (54) is located at the intersection of the through holes (11). A cavity (10) is formed on the wall of the longitudinally arranged through hole (11); a limit plate (55) is fixedly mounted on one end of the docking rod (52); the shape of the limit plate (55) matches the shape of the cavity (10); and the limit plate (55) is overlapped at one end of the cavity (10); A return spring (56) is fixedly mounted on the inner wall of the cavity (10), one end of the return spring (56) is fixedly connected to the limit plate (55), and the return spring (56) is sleeved on the outer wall of the docking rod (52).

2. The combined support structure for transverse seismic resistance of a long-span bridge according to claim 1, characterized in that: Positioning side plates (6) are fixedly mounted on both sides of the horizontal block (2), one end of the supporting frame (31) is plugged into the interior of the positioning side plate (6), and a receiving groove (32) is provided at the junction of the supporting frame (31) and the horizontal block (2).

3. The combined support structure for transverse earthquake resistance of a long-span bridge according to claim 2, characterized in that: A positioning rod (8) is fixedly mounted on the inner wall of the guide slide groove (9), the intercepting rope (34) is overlapped on the positioning rod (8), and an extension plate (33) is fixedly mounted on the top of the supporting frame (31).

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