Steel structure bridge joint connecting structure

Abstract

The utility model relates to the technical field of steel structure bridges, in particular to a steel structure bridge joint connecting structure which comprises a bridge frame, a supporting beam A and a supporting beam B. The supporting beam A is sleeved with an outer frame A. A support A is welded to one side of the outer frame A. A sleeve frame A making contact with the bridge frame is welded to the end, away from the outer frame A, of the support A. Limiting blocks are symmetrically and integrally formed on the outer portion of the sleeve frame A, positioning screw holes are formed in the surfaces of the limiting blocks, and the outer portion of the supporting beam B is sleeved with an outer frame B; through the arrangement of the sleeve frame A, the outer frame A, the outer frame B, the support A, the support B, the sleeve frame B, the rubber block A, the rubber block B, the limiting block and the positioning bolt, the problem that when an existing steel structure bridge joint connecting structure is used, sealing treatment is inconvenient to conduct on the connecting position outside a bridge frame is solved.

Description

Technical Field

[0001] This utility model relates to the field of steel structure bridge technology, and specifically to a steel structure bridge node connection structure. Background Technology

[0002] Steel structure bridges refer to bridges whose main load-bearing structure is made of steel. They are usually called steel structure bridges or steel bridges. The main design concept is to assemble prefabricated steel bridges with the fewest types of unit components, which can bear various loads and different spans. They can be transported by ordinary medium-sized trucks and, in special circumstances, can be assembled entirely by manpower.

[0003] Patent No. 202021860056.1 discloses a steel bridge node connection structure. When the crossbeam is under load, the force at the connection is relatively concentrated, which affects the stability of the connection and easily causes the steel structure at the connection to deform.

[0004] However, when using the existing steel structure bridge node connection structure, the first and second horizontal beams are installed on the vertical beams. However, there are gaps between the first and vertical beams and between the second and vertical beams. Foreign objects can enter the connection points on the vertical beams through these gaps and cause corrosion to the connection points outside the vertical beams, which will have a certain impact on the service life of the vertical beams. Therefore, a steel structure bridge node connection structure is set up. Utility Model Content

[0005] The main purpose of this utility model is to provide a steel structure bridge node connection structure. This utility model solves the problem that it is inconvenient to seal the connection points outside the bridge frame when using existing steel structure bridge node connection structures by setting up a sleeve A, outer frame A, outer frame B, support A, support B, sleeve B, rubber block A, rubber block B, limit block and positioning bolt.

[0006] The technical solution adopted by this utility model to solve its technical problem is a steel structure bridge node connection structure, including a bridge frame, a support beam A and a support beam B. An outer frame A is sleeved on the outside of the support beam A. A bracket A is welded to one side of the outer frame A, and a sleeve A that contacts the bridge frame is welded to the end of the bracket A away from the outer frame A. A limiting block is integrally formed symmetrically on the outside of the sleeve A, and a positioning screw hole is opened on the surface of the limiting block. An outer frame B is sleeved on the outside of the support beam B, and a bracket B is welded to one side of the outer frame B. A sleeve B that contacts the bridge frame is welded to the end of the bracket B away from the outer frame B. Positioning bolts that enter the positioning screw holes are symmetrically threaded on the outside of the sleeve B. Rubber blocks A that are tightly connected to the bridge frame are bonded to the inside of both the sleeve A and the sleeve B is screwed to one side of the sleeve A to fix the rubber block B that contacts the sleeve A.

[0007] By adopting the above technical solution, when support beams A and B are installed outside the bridge frame, firstly, outer frame A and sleeve A are placed outside support beam A, and outer frame B and sleeve B are placed outside support beam B. After support beams A and B are fixed outside the bridge frame, outer frame A moves sleeve A on one side of support A, so that sleeve A moves to the connection between support beam A and the bridge frame. Outer frame B moves sleeve B on support B, so that sleeve B moves to the connection between support beam B and the bridge frame. Rubber block A inside sleeve A seals the connection between support beam A and the bridge frame, and rubber block A inside sleeve B seals the connection between support beam B and the bridge frame. Then, the limiting block on sleeve A enters the limiting groove opened on sleeve B, and rubber block B on sleeve A is tightly connected to sleeve A. Then, the positioning bolt on sleeve is rotated so that the positioning bolt enters the positioning screw hole opened on the surface of the limiting block, thereby facilitating the sealing treatment of the connection outside the bridge frame.

[0008] Specifically, the outer frame A has corner brackets A symmetrically welded to its exterior for support, and connecting blocks A are symmetrically welded to the outer side of corner brackets A. A spring is welded inside the connecting block A, and a fixing block is welded to one side of the spring. The outer frame B has corner brackets B symmetrically welded to its exterior for support, and connecting blocks B are symmetrically welded to the outer side of corner brackets B. The surface of the connecting block B has fixing holes for limiting the fixing block.

[0009] By adopting the above technical solution, when the bracket A and bracket B are connected, the connecting block A on one side of the bracket A is connected to the connecting block B on the side of the bracket B. Then, the fixing block on the connecting block A tilts downward from left to right. The fixing block is squeezed into the connecting block A by the connecting block B. Then, the spring in the connecting block A is compressed, and then the fixing block enters into the connecting block B. Then, the spring drives the fixing block in the connecting block B to pop outward. Then, the fixing block enters the fixing hole opened on the connecting block B, so that the connecting block A and the connecting block B are fixed to the outside of the bridge frame, thereby improving the stability of the bracket A and the bracket B.

[0010] Specifically, the inner dimensions of the limiting groove match the outer dimensions of the limiting block.

[0011] By adopting the above technical solution, when the limiting block is placed into the sleeve B, the limiting groove inside the sleeve B matches the outside of the limiting block, making it easy for the limiting block to be placed into the sleeve B.

[0012] Specifically, one side of the corner frame A is threadedly connected to a fixing bolt A that contacts the support beam A, and one side of the corner frame B is threadedly connected to a fixing bolt B that contacts the support beam B.

[0013] By adopting the above technical solution, fixing bolt A connects corner frame A to support beam A, and fixing bolt B connects corner frame B to support beam B, thereby improving the stability of the connection between support beam A and support beam B and the bridge frame.

[0014] Specifically, both corner brackets A and B are externally threaded with fixing bolts C that connect to the bridge frame.

[0015] By adopting the above technical solution, fixing bolts C are installed on the outside of both corner brackets A and B, which makes it easy to fix corner brackets A and B to the outside of the bridge frame.

[0016] The beneficial effects of this utility model are:

[0017] (1) In the steel structure bridge node connection structure described in this utility model, when the support beam A and support beam B are installed outside the bridge frame, the outer frame A and the sleeve A are first placed outside the support beam A, and the outer frame B and the sleeve B are placed outside the support beam B. After the support beam A and support beam B are fixed outside the bridge frame, the outer frame A drives the sleeve A on one side of the support A to move, so that the sleeve A moves to the connection between the support beam A and the bridge frame. The outer frame B drives the sleeve B on the support B to move, so that the sleeve B moves to the connection between the support beam B and the bridge frame. The rubber block A inside the sleeve A seals the connection between the support beam A and the bridge frame. The rubber block A inside the sleeve B seals the connection between the support beam B and the bridge frame. Then, the limiting block on the sleeve A enters the limiting groove opened on the sleeve B. The rubber block B on the sleeve A is tightly connected to the sleeve A. Then, the positioning bolt on the sleeve is rotated so that the positioning bolt enters the positioning screw hole opened on the surface of the limiting block, thereby facilitating the sealing treatment of the connection outside the bridge frame.

[0018] (2) In the steel structure bridge node connection structure described in this utility model, when the sleeve A and the sleeve B are connected, the connecting block A on one side of the corner frame A is connected to the connecting block B on one side of the corner frame B. Then, the fixing block on the connecting block A tilts downward from left to right. The fixing block is squeezed into the connecting block A by the connecting block B. Then, the spring in the connecting block A is compressed. Then, the fixing block enters the connecting block B. Then, the spring drives the fixing block in the connecting block B to pop outward. Then, the fixing block enters the fixing hole opened on the connecting block B, so that the connecting block A and the connecting block B are fixed to the outside of the bridge frame, thereby improving the stability of the corner frame A and the corner frame B. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of a steel bridge node connection structure according to the present invention;

[0021] Figure 2 This is a schematic diagram of the frame A structure of a steel bridge node connection structure according to the present invention;

[0022] Figure 3 This is a schematic diagram of the frame B structure of a steel bridge node connection structure according to the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the connecting block A in a steel structure bridge node connection structure according to the present invention.

[0024] In the diagram: 1. Bridge frame; 2. Sleeve A; 3. Sleeve B; 4. Support A; 5. External scaffold A; 6. Angle frame A; 7. Fixing bolt A; 8. Support beam A; 9. External scaffold B; 10. Fixing bolt B; 11. Support B; 12. Angle frame B; 13. Connecting block B; 14. Positioning bolt; 15. Support beam B; 16. Positioning screw hole; 17. Limiting block; 18. Rubber block A; 19. Limiting groove; 20. Rubber block B; 21. Fixing bolt C; 22. Connecting block A; 23. Fixing hole; 24. Spring; 25. Fixing block. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] To seal the connections between support beams A8 and B15 and bridge frame 1, as an embodiment of this utility model, such as... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the steel bridge node connection structure of this utility model includes a bridge frame 1, a support beam A8, and a support beam B15. An outer frame A5 is sleeved on the outside of the support beam A8. A bracket A4 is welded to one side of the outer frame A5, and a sleeve A2 that contacts the bridge frame 1 is welded to the end of the bracket A4 away from the outer frame A5. A limiting block 17 is integrally formed symmetrically on the outside of the sleeve A2, and a positioning screw hole 16 is opened on the surface of the limiting block 17. An outer frame B9 is sleeved on the outside of the support beam B15, and a bracket B11 is welded to one side of the outer frame B9. A sleeve B3 that contacts the bridge frame 1 is welded to the end of the bracket B11 away from the outer frame B9. A positioning bolt 14 that enters the positioning screw hole 16 is symmetrically threaded on the outside of the sleeve B3. Rubber blocks A18 that are tightly connected to the bridge frame 1 are glued to the inside of both the sleeve A2 and the sleeve B3. A rubber block B20 that contacts the sleeve A2 is screwed to one side of the sleeve B3.

[0027] In use, when support beams A8 and B15 are installed outside the bridge frame 1, first, outer frame A5 and sleeve frame A2 are fitted over support beam A8, and outer frame B9 and sleeve frame B3 are fitted over support beam B15. After support beams A8 and B15 are fixed outside the bridge frame 1, outer frame A5 moves sleeve frame A2 on one side of support A4, causing sleeve frame A2 to move to the connection point between support beam A8 and bridge frame 1. Outer frame B9 moves sleeve frame B3 on support B11, causing sleeve frame B3 to move to the connection point between support beam B15 and bridge frame 1. Rubber block A18 seals the connection between support beam A8 and bridge frame 1. Rubber block A18 inside sleeve B3 seals the connection between support beam B15 and bridge frame 1. Then, the limiting block 17 on sleeve A2 enters the limiting groove 19 opened on sleeve B3. Rubber block B20 on sleeve A2 is tightly connected to sleeve A2. Then, the positioning bolt 14 on the sleeve is rotated so that the positioning bolt 14 enters the positioning screw hole 16 opened on the surface of the limiting block 17, thereby facilitating the sealing treatment of the connection between support beam A8, support beam B15 and bridge frame 1 respectively.

[0028] To improve the stability of corner brackets A6 and B12, for example, as follows: Figure 1 , Figure 2 and Figure 3 As shown, this utility model also includes corner brackets A6 symmetrically welded to the outside of the outer frame A5 for support, connecting blocks A22 symmetrically welded to the outside of the corner brackets A6, springs 24 welded inside the connecting blocks A22, and fixing blocks 25 welded to one side of the springs 24; corner brackets B12 symmetrically welded to the outside of the outer frame B9 for support, and connecting blocks B13 symmetrically welded to the outside of the corner brackets B12; fixing holes 23 are provided on the surface of the connecting blocks B13 to limit the fixing blocks 25.

[0029] In use, when the brackets A2 and B3 are connected, the connecting block A22 on one side of the corner bracket A6 connects with the connecting block B13 on the side of the corner bracket B12. Then, the fixing block 25 on the connecting block A22 tilts downward from left to right. The fixing block 25 is squeezed into the connecting block A22 by the connecting block B13. Then, the spring 24 in the connecting block A22 is compressed, and then the fixing block 25 enters the connecting block B13. Then, the spring 24 drives the fixing block 25 in the connecting block B13 to pop outward. Then, the fixing block 25 enters the fixing hole 23 opened on the connecting block B13, so that the connecting block A22 and the connecting block B13 are fixed to the outside of the bridge frame 1, thereby improving the stability of the corner brackets A6 and B12.

[0030] To facilitate the placement of the limiting block 17 into the sleeve B3, for example, as shown... Figure 2 and Figure 3 As shown, the present invention also includes a limit groove 19 whose inner dimensions match the outer dimensions of the limit block 17.

[0031] When in use, when the limiting block 17 is placed into the sleeve B3, the limiting groove 19 inside the sleeve B3 matches the outside of the limiting block 17, making it easy for the limiting block 17 to be placed into the sleeve B3.

[0032] To improve the stability of the connection between support beams A8 and B15 and bridge frame 1, for example, as follows: Figure 1 As shown, the present invention also includes a fixing bolt A7 threadedly connected to one side of the corner bracket A6, which contacts the support beam A8, and a fixing bolt B10 threadedly connected to one side of the corner bracket B12, which contacts the support beam B15.

[0033] In use, fixing bolt A7 connects corner bracket A6 to support beam A8, and fixing bolt B10 connects corner bracket B12 to support beam B15, thereby improving the stability of support beam A8 and support beam B15 connected to bridge frame 1 respectively.

[0034] To secure angle brackets A6 and B12 to the outside of bridge frame 1, for example, as shown... Figure 1 As shown, the present invention also includes fixing bolts C21 that are threaded to the outside of the corner brackets A6 and B12 and connected to the bridge frame 1.

[0035] During use, both corner brackets A6 and B12 are equipped with fixing bolts C21, which facilitates fixing corner brackets A6 and B12 to the outside of the bridge frame 1.

[0036] In use, when support beams A8 and B15 are installed outside the bridge frame 1, the outer frame A5 and sleeve A2 are first fitted over support beam A8, and the outer frame B9 and sleeve B3 are fitted over support beam B15. After support beams A8 and B15 are fixed outside the bridge frame 1, the outer frame A5 moves sleeve A2 on one side of the support A4, causing sleeve A2 to move to the connection point between support beam A8 and bridge frame 1. The outer frame B9 moves sleeve B3 on support B11, causing sleeve B3 to move to the connection point between support beam B15 and bridge frame 1. The rubber block A18 inside seals the connection between the support beam A8 and the bridge frame 1. The rubber block A18 inside the sleeve B3 seals the connection between the support beam B15 and the bridge frame 1. Then, the limiting block 17 on the sleeve A2 enters the limiting groove 19 opened on the sleeve B3. The rubber block B20 on the sleeve A2 is tightly connected to the sleeve A2. Then, the positioning bolt 14 on the sleeve is rotated so that the positioning bolt 14 enters the positioning screw hole 16 opened on the surface of the limiting block 17, thereby facilitating the sealing treatment of the connection between the support beam A8, the support beam B15 and the bridge frame 1 respectively.

[0037] When the brackets A2 and B3 are connected, the connecting block A22 on one side of the corner bracket A6 connects with the connecting block B13 on one side of the corner bracket B12. Then, the fixing block 25 on the connecting block A22 tilts downward from left to right. The fixing block 25 is squeezed into the connecting block A22 by the connecting block B13. Then, the spring 24 in the connecting block A22 is compressed, and then the fixing block 25 enters the connecting block B13. Then, the spring 24 drives the fixing block 25 in the connecting block B13 to pop outward. Then, the fixing block 25 enters the fixing hole 23 opened on the connecting block B13, so that the connecting block A22 and the connecting block B13 are fixed to the outside of the bridge frame 1, thereby improving the stability of the corner brackets A6 and B12.

[0038] When the limiting block 17 is placed into the sleeve B3, the limiting groove 19 in the sleeve B3 matches the outside of the limiting block 17, making it easy for the limiting block 17 to be placed into the sleeve B3.

[0039] Fixing bolt A7 connects corner bracket A6 to support beam A8, and fixing bolt B10 connects corner bracket B12 to support beam B15, thereby improving the stability of support beam A8 and support beam B15 connected to bridge frame 1 respectively.

[0040] Both corner brackets A6 and B12 are equipped with fixing bolts C21, which facilitates fixing corner brackets A6 and B12 to the outside of bridge frame 1.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel structure bridge joint connecting structure, characterized by, The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact.

2. The steel structure bridge joint connecting structure according to claim 1, characterized in that, The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact.

3. The steel structure bridge joint connecting structure according to claim 1, characterized in that, The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact.

4. The steel structure bridge joint connecting structure according to claim 2, characterized in that, The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact.

5. The steel structure bridge joint connecting structure according to claim 2, characterized in that, The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact. The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16), the sleeve frame A (2) and sleeve frame B (3) inboard are all bonded with rubber block A (18) and bridge frame (1) is closely connected, and the sleeve frame B (3) one side screw is fixed with rubber block B (20) and sleeve frame A (2) contact. The utility model relates to a bridge support structure, including bridge frame (1), support beam A (8), support beam B (15) and limiting groove (19), support beam A (8) outside sleeve joint has outer frame A (5), outer frame A (5) one side is welded with support A (4), and the support A (4) away from the one end of outer frame A (5) is welded with the sleeve frame A (2) of contact with bridge frame (1), the sleeve frame A (2) outside symmetry is integrally formed with limiting block (17), and the limiting block (17) surface is provided with the positioning screw hole (16), support beam B (15) outside sleeve joint has outer frame B (9), and outer frame B (9) one side is welded with support B (11), the support B (11) away from the one end of outer frame B (9) is welded with the sleeve frame B (3) of contact with bridge frame (1), the sleeve frame B (3) outside symmetry is screw connected with the positioning bolt (14) in the entering positioning screw hole (16

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