Bridge reconstruction and extension wet joint reinforcing device based on steel fiber reinforced concrete

Abstract

The invention belongs to the technical field of bridge expansion, and particularly relates to a bridge reconstruction and expansion wet joint reinforcing device based on steel fiber concrete, which comprises a wet connection section for fixedly connecting a first bridge section and a second bridge section, and the wet connection section comprises a first anchoring steel bar and a second anchoring steel bar which are respectively anchored in the first bridge section and the second bridge section; the first anchoring steel bars and the second anchoring steel bars are arranged in the width direction of the first bridge section and the width direction of the second bridge section at equal intervals. The reinforcement cage assembly is used for forming a reinforcement framework of a wet connection section with the first anchoring reinforcements and the second anchoring reinforcements; the prestressed U-shaped rib is arranged in the reinforcement cage assembly, and the two ends of the prestressed U-shaped rib are bound and fixed with the first anchoring steel bar and the second anchoring steel bar respectively; the bending assembly is used for bending the prestressed U-shaped rib inwards to generate prestress; and the concrete is used for pouring the wet connection section after the steel bars are arranged, and the concrete is doped with steel fibers. The bearing capacity and durability of the wet connection section can be remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge expansion, and in particular relates to a bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete. Background Art

[0002] Conventional ribbed beam bridge wet joints usually use ordinary concrete. These materials have limitations in compressive strength and crack resistance, especially under long-term loads and harsh environments, which are prone to problems such as crack expansion and material degradation. How to improve the durability of ribbed beam bridge wet joints has become an urgent problem to be solved. Therefore, we propose a bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete. Summary of the invention

[0003] The purpose of the present invention is to provide a bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete to solve the above problems.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete includes a wet joint section for fixing a first bridge section and a second bridge section, wherein the wet joint section includes:

[0006] The first anchoring steel bar and the second anchoring steel bar are anchored in the first bridge section and the second bridge section respectively, and a plurality of the first anchoring steel bars and a plurality of the second anchoring steel bars are arranged at equal intervals along the width direction of the first bridge section and the second bridge section respectively;

[0007] A steel cage assembly, used to form a steel skeleton of the wet joint section with a plurality of the first anchoring steel bars and a plurality of the second anchoring steel bars;

[0008] A prestressed U-shaped reinforcement is arranged in the reinforcement cage assembly, and two ends of the prestressed U-shaped reinforcement are respectively tied and fixed to the first anchor reinforcement and the second anchor reinforcement;

[0009] A bending assembly, used to bend the prestressed U-shaped rib inward to generate prestress;

[0010] Concrete, used for pouring the wet joint after the reinforcement is set;

[0011] The concrete is mixed with steel fibers.

[0012] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the steel cage assembly includes a wet joint section steel cage, and the first anchor steel bar and the second anchor steel bar are tied and fixed to the corresponding stirrups of the wet joint section steel cage.

[0013] According to the above-mentioned bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete, a lap bar is provided between the first anchor steel bar and the second anchor steel bar, and the two ends of the lap bar are respectively overlapped and fixed to the first anchor steel bar and the second anchor steel bar, and the lap bar is tied and fixed to the corresponding stirrups of the steel cage of the wet joint section.

[0014] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, steel fibers and polypropylene fibers are mixed into the concrete.

[0015] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the wet joint section is a comb-tooth type structure.

[0016] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the bending component includes:

[0017] A tensioning steel wire, wherein two ends of the tensioning steel wire are respectively fixed to two ends of the prestressed U-shaped reinforcement;

[0018] A horizontal tube is sleeved on the outside of the tensioning wire, the horizontal tube is a hollow structure, and the tensioning wire slides in the horizontal tube;

[0019] A vertical pipe, detachably connected to the top of the horizontal pipe;

[0020] The steel wire tightening part is used to tighten the tensioning steel wire to pull the two ends of the prestressed U-shaped reinforcement closer to the middle.

[0021] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the steel wire tightening part includes:

[0022] A wire winding roller is rotatably arranged at the middle of the inner side of the horizontal tube, and the middle part of the tensioning wire is wound around the wire winding roller;

[0023] A rotating rod, which is axially connected to the top of the wire winding roller and is rotatably arranged inside the vertical pipe;

[0024] A rotating disk, the shaft of which is connected to the top of the rotating rod;

[0025] A handle connected to the rotating disk, wherein the rotating disk is driven to rotate by rotating the handle;

[0026] The one-way rotating portion is arranged between the vertical pipe and the rotating rod, and is used to limit the one-way rotation of the rotating rod to tighten the tensioning wire.

[0027] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the one-way rotating part includes:

[0028] A ratchet wheel is coaxially sleeved on the outer side of the rotating rod, and the rotating rod is fixedly connected to the ratchet wheel;

[0029] A pawl is limitedly matched with the ratchet wheel, and the pawl is elastically rotatably arranged on the inner wall of the vertical tube.

[0030] According to the above-mentioned wet joint reinforcement device for bridge reconstruction and expansion based on steel fiber concrete, the vertical pipe and the horizontal pipe are an integrally formed structure, and a torsion shear section is provided between the vertical pipe and the horizontal pipe. When the rotational torque of the vertical pipe is greater than the bearing capacity of the torsion shear section, the torsion shear section breaks to separate the vertical pipe from the horizontal pipe.

[0031] According to the above-mentioned steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device, the top of the vertical pipe is axially connected to a limit ring, and the limit ring is provided with a plurality of limit holes arranged at equal intervals in the circumferential direction, and any two symmetrical limit holes are radially limited with a limit rod, and the limit rod is vertically slidably arranged in the corresponding limit hole;

[0032] The middle portion of the limiting rod is vertically slidably arranged with the rotating disk;

[0033] The middle part of the limit rod is coaxially fixed with a limit plate, the limit plate is vertically slidably arranged in a movable groove opened in the rotating disk, a spring is arranged in the movable groove, the spring is sleeved on the outer side of the corresponding limit rod, the top of the spring is fixedly connected to the bottom of the limit plate, and the bottom of the spring is fixedly connected to the bottom of the inner wall of the movable groove;

[0034] The top ends of the two limiting rods are fixedly connected to the bottom of the same handle.

[0035] Compared with the prior art, the present invention has the following advantages and technical effects:

[0036] When in use, steel fibers are added to the concrete to give it good anti-cracking performance. At the same time, multiple prestressed U-shaped bars are arranged inside, and the prestressed U-shaped bars are bent inward by the bending assembly to generate prestress. After the bending assembly is removed, the two ends of the prestressed U-shaped bars generate stress that moves away from each other. When used in the wet joint, since its stress state is lower tension and upper contraction, the two ends of the prestressed U-shaped bars will be driven to move closer to each other, which is opposite to the direction of stress generated by the prestressed U-shaped bars. Therefore, the bearing capacity of the wet joint can be improved, thereby improving its durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 It is a top view of the steel cage structure of the wet joint section of the present invention;

[0040] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle part;

[0041] Figure 4 This is a front view of the wet joint steel cage of the present invention;

[0042] Figure 5 This is a connection diagram of the bending component and the prestressed U-shaped rib of the present invention;

[0043] Figure 6 It is a schematic diagram of the structure of the bending assembly of the present invention;

[0044] Figure 7 For the present invention Figure 6 A partial enlarged view of point B in the middle;

[0045] Figure 8 For the present invention Figure 6 A partial enlarged view of point C in the middle;

[0046] Among them, 1. wet joint section; 2. first bridge section; 3. second bridge section; 4. first anchoring steel bar; 5. second anchoring steel bar; 6. wet joint section steel cage; 7. lap bars; 8. prestressed U-shaped bars; 9. bending assembly; 901. vertical pipe; 902. torsion shear section; 903. horizontal pipe; 904. tensioning wire; 905. rotating rod; 906. limiting ring; 907. rotating disk; 908. limiting hole; 909. limiting rod; 910. handle; 911. limiting plate; 912. spring; 913. movable groove; 914. pawl; 915. ratchet; 916. wire winding roller. DETAILED DESCRIPTION

[0047] 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 described embodiments 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.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figures 1 to 8 The present invention discloses a bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete, comprising a wet joint section 1 for fixing a first bridge section 2 and a second bridge section 3, wherein the wet joint section 1 comprises:

[0050] The first anchoring steel bar 4 and the second anchoring steel bar 5 are anchored in the first bridge section 2 and the second bridge section 3, respectively. A plurality of the first anchoring steel bars 4 and a plurality of the second anchoring steel bars 5 are arranged at equal intervals along the width direction of the first bridge section 2 and the second bridge section 3, respectively.

[0051] A steel cage assembly, used to form a steel skeleton of the wet joint section 1 together with a plurality of first anchor steel bars 4 and a plurality of second anchor steel bars 5;

[0052] The prestressed U-shaped reinforcement 8 is arranged in the reinforcement cage assembly, and the two ends are respectively tied and fixed to the first anchor reinforcement 4 and the second anchor reinforcement 5;

[0053] The bending assembly 9 is used to bend the prestressed U-shaped rib 8 inward to generate prestress;

[0054] Concrete, used for pouring the wet joint 1 after the reinforcement is set;

[0055] Steel fibers are mixed into the concrete.

[0056] When in use, steel fibers are added to the concrete to make it have good anti-cracking performance. At the same time, a plurality of prestressed U-shaped ribs 8 are arranged inside, and the prestressed U-shaped ribs 8 are bent inwardly through the bending component 9 to generate prestress. After the bending component 9 is removed, the two ends of the prestressed U-shaped ribs 8 generate stress that moves away from each other. When the wet joint section 1 is in use, since its stress state is lower tension and upper contraction, the two ends of the prestressed U-shaped ribs 8 will be driven to approach each other, which is opposite to the stress direction generated by the prestressed U-shaped ribs 8. Therefore, the bearing capacity of the wet joint section 1 can be improved, thereby improving its durability.

[0057] As one optional embodiment, the steel cage assembly includes a wet joint steel cage 6 , and the first anchor steel bar 4 and the second anchor steel bar 5 are tied and fixed to the stirrups of the corresponding wet joint steel cage 6 .

[0058] As one of the optional implementations, a lap bar 7 is provided between the first anchor steel bar 4 and the second anchor steel bar 5, and the two ends of the lap bar 7 are overlapped and fixed to the first anchor steel bar 4 and the second anchor steel bar 5 respectively, and the lap bar 7 is tied and fixed to the corresponding stirrups of the wet joint section steel cage 6.

[0059] As an optional implementation manner, polypropylene fibers are mixed into the concrete.

[0060] By adding polypropylene fibers into concrete and properly mixing them with steel fibers, the amount of steel fibers used can be reduced, thus meeting the use conditions and reducing costs.

[0061] As an optional implementation, the wet joint section 1 is a comb-tooth structure.

[0062] Compared with the traditional strip-shaped wet joint, the comb-tooth-shaped wet joint section 1 can improve the degree of integration with the first bridge section 2 and the second bridge section 3, improve the integrity of the first bridge section 2, the wet joint section 1 and the second bridge section 3, and thus improve the overall bearing capacity and durability.

[0063] As an optional embodiment, the bending component 9 includes:

[0064] The tensioning wire 904 is tightened, and the two ends of the tensioning wire 904 are respectively fixed to the two ends of the prestressed U-shaped reinforcement 8;

[0065] The horizontal tube 903 is sleeved on the outside of the tension wire 904. The horizontal tube 903 is a hollow structure, and the tension wire 904 slides inside the horizontal tube 903.

[0066] The vertical pipe 901 is detachably connected to the top of the horizontal pipe 903;

[0067] The steel wire tightening portion is used to tighten the tensioning steel wire 904 to pull the two ends of the prestressed U-shaped reinforcement 8 toward the middle.

[0068] When in use, the tensioning wire 904 is tightened by the wire tightening part, and the two ends of the prestressed U-shaped reinforcement 8 are pulled toward the middle, and then concrete is poured. After the concrete solidifies, the ends of the prestressed U-shaped reinforcement 8 are fixed to the solidified concrete. At this time, the tensioning wire 904 is further tightened by the wire tightening part until it is broken, and the wire tightening part is taken out. At the same time, the vertical pipe 901 and the horizontal pipe 903 are separated and pulled out, and the holes are filled with concrete of the same proportion. The ends of the prestressed U-shaped reinforcement 8 are no longer constrained by the tensioning wire 904, thereby generating prestress.

[0069] As an optional embodiment, the wire tightening part includes:

[0070] The wire winding roller 916 is rotatably arranged at the middle of the inner side of the horizontal tube 903, and the middle part of the tensioning wire 904 is wound around the wire winding roller 916;

[0071] The rotating rod 905 is axially connected to the top of the wire winding roller 916 and is rotatably arranged inside the vertical tube 901;

[0072] A rotating disk 907 is axially connected to the top of the rotating rod 905;

[0073] A handle 910 is connected to the rotating disk 907. The rotating disk 907 is driven to rotate by rotating the handle 910.

[0074] The one-way rotating portion is disposed between the vertical tube 901 and the rotating rod 905 , and is used to limit the one-way rotation of the rotating rod 905 to tighten the tensioning wire 904 .

[0075] The wire winding roller 916 is rotatably disposed in the middle of the inner side of the horizontal tube 903 and is designed to be detachable from the horizontal tube 903 .

[0076] Specifically, a column is fixedly connected to the middle of the inner side of the horizontal tube 903 , and the column is vertically slidably arranged with the bottom center of the wire winding roller 916 , and the column is rotationally connected with the bottom center of the wire winding roller 916 .

[0077] By holding the handle 910, the handle 910 drives the rotating disk 907 to rotate, and the rotating disk 907 drives the rotating rod 905 to rotate so that the wire winding roller 916 will be tightened to pull the two ends of the prestressed U-shaped rib 8. The unidirectional rotating part can prevent the rotating rod 905 from reversing, and then can continue to apply force to reach the preset stress value of the prestressed U-shaped rib 8.

[0078] After the concrete solidifies, the rotating rod 905 continues to drive the wire winding roller 916 to rotate until the tensioning wire 904 is broken.

[0079] As an optional implementation, the one-way rotating portion includes:

[0080] The ratchet 915 is coaxially sleeved on the outer side of the rotating rod 905, and the rotating rod 905 is fixedly connected to the ratchet 915;

[0081] The pawl 914 is limitedly matched with the ratchet wheel 915 , and the pawl 914 is elastically rotatably arranged on the inner wall of the vertical tube 901 .

[0082] Through the cooperation between the pawl 914 and the ratchet wheel 915 , the rotating rod 905 can be rotated in a single direction, so that the tension wire 904 can be tightened.

[0083] As one of the optional implementations, the vertical pipe 901 and the horizontal pipe 903 are an integrally formed structure, and a torsion shear section 902 is provided between the vertical pipe 901 and the horizontal pipe 903. When the rotational torque of the vertical pipe 901 is greater than the bearing capacity of the torsion shear section 902, the torsion shear section 902 breaks to separate the vertical pipe 901 from the horizontal pipe 903.

[0084] When the rotation torque of the vertical pipe 901 is greater than the bearing capacity of the torsion shear section 902 , the torsion shear section 902 breaks to separate the vertical pipe 901 from the horizontal pipe 903 , and the vertical pipe 901 can be pulled out.

[0085] As one of the optional implementations, the top of the vertical tube 901 is axially connected to a limit ring 906, and the limit ring 906 is provided with a plurality of limit holes 908 arranged at equal intervals in the circumferential direction, and a limit rod 909 is radially limited in any two symmetrical limit holes 908, and the limit rod 909 is vertically slidably arranged in the corresponding limit hole 908;

[0086] The middle part of the limiting rod 909 is vertically slidably arranged with the rotating disk 907;

[0087] The middle part of the limiting rod 909 is coaxially fixed with a limiting plate 911, and the limiting plate 911 is vertically slidably arranged in a movable groove 913 provided in the rotating disk 907, and a spring 912 is arranged in the movable groove 913, and the spring 912 is sleeved on the outer side of the corresponding limiting rod 909, and the top of the spring 912 is fixedly connected to the bottom of the limiting plate 911, and the bottom of the spring 912 is fixedly connected to the bottom of the inner wall of the movable groove 913;

[0088] The top ends of the two limiting rods 909 are fixedly connected to the bottom of the same handle 910 .

[0089] During the tensioning stage of the tensioning wire 904, the handle 910 is used to drive the rotating disk 907 to rotate. When the tensioning wire 904 is broken, the vertical pipe 901 needs to be separated from the horizontal pipe 903. By pressing down the handle 910, the limiting rod 909 is inserted into the corresponding limiting hole 908. At this time, the limiting plate 911 slides in the movable groove 913 to compress the spring 912. The handle 910 is turned to drive the limiting ring 906 to drive the vertical pipe 901 to rotate. At this time, the horizontal pipe 903 is fixed due to the solidification of the concrete, and the torsional shear section 902 is broken because the torsional force is greater than the bearing capacity, so that the vertical pipe 901 is separated from the horizontal pipe 903.

[0090] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0091] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A bridge reconstruction and expansion wet joint reinforcement device based on steel fiber concrete, comprising a wet joint section (1) for fixing a first bridge section (2) and a second bridge section (3), characterized in that: The wet joint section (1) comprises: A first anchoring steel bar (4) and a second anchoring steel bar (5) are anchored in the first bridge section (2) and the second bridge section (3), respectively; a plurality of the first anchoring steel bars (4) and a plurality of the second anchoring steel bars (5) are arranged at equal intervals along the width direction of the first bridge section (2) and the second bridge section (3); A steel cage assembly, used to form a steel skeleton of the wet joint section (1) together with a plurality of the first anchoring steel bars (4) and a plurality of the second anchoring steel bars (5); A prestressed U-shaped steel bar (8) is arranged in the steel cage assembly, and two ends of the prestressed U-shaped steel bar are respectively tied and fixed to the first anchor steel bar (4) and the second anchor steel bar (5); A bending assembly (9) for causing the prestressed U-shaped rib (8) to bend inward to generate prestress; Concrete, used for pouring the wet joint (1) after the reinforcement is set; The concrete is mixed with steel fibers.

2. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 1 is characterized in that: The steel cage assembly comprises a wet joint steel cage (6), and the first anchor steel bar (4) and the second anchor steel bar (5) are tied and fixed to the corresponding stirrups of the wet joint steel cage (6).

3. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 2 is characterized by: A lap bar (7) is provided between the first anchoring steel bar (4) and the second anchoring steel bar (5), and two ends of the lap bar (7) are respectively overlapped and fixed to the first anchoring steel bar (4) and the second anchoring steel bar (5), and the lap bar (7) is tied and fixed to the corresponding stirrups of the wet joint section steel cage (6).

4. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 1 is characterized by: Polypropylene fibers are mixed into the concrete.

5. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 1 is characterized by: The wet joint section (1) is a comb-tooth structure.

6. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 1 is characterized in that: The bending assembly (9) comprises: A tensioning steel wire (904), wherein two ends of the tensioning steel wire (904) are respectively fixed to two ends of the prestressed U-shaped rib (8); A horizontal tube (903) is sleeved on the outside of the tensioning wire (904); the horizontal tube (903) is a hollow structure, and the tensioning wire (904) slides inside the horizontal tube (903); A vertical pipe (901) detachably connected to the top of the horizontal pipe (903); The steel wire tightening portion is used to tighten the tensioning steel wire (904) to pull the two ends of the prestressed U-shaped rib (8) toward the middle.

7. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 6 is characterized in that: The steel wire tightening portion comprises: A wire winding roller (916) is rotatably disposed at the middle portion of the inner side of the horizontal tube (903), and the middle portion of the tensioning wire (904) is wound around the wire winding roller (916); A rotating rod (905) is axially connected to the top of the wire winding roller (916) and is rotatably disposed inside the vertical tube (901); A rotating disk (907) axially connected to the top of the rotating rod (905); A handle (910) connected to the rotating disk (907), wherein the rotating disk (907) is driven to rotate by rotating the handle (910); The one-way rotating portion is arranged between the vertical pipe (901) and the rotating rod (905) and is used to limit the one-way rotation of the rotating rod (905) to tighten the tensioning wire (904).

8. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 7 is characterized in that: The one-way rotating portion comprises: A ratchet (915) is coaxially sleeved on the outer side of the rotating rod (905), and the rotating rod (905) is fixedly connected to the ratchet (915); The pawl (914) is limitedly matched with the ratchet wheel (915), and the pawl (914) is elastically rotatably arranged on the inner wall of the vertical tube (901).

9. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 7, characterized in that: The vertical tube (901) and the horizontal tube (903) are an integrally formed structure, and a torsion shear section (902) is provided between the vertical tube (901) and the horizontal tube (903). When the rotation torque of the vertical tube (901) is greater than the bearing capacity of the torsion shear section (902), the torsion shear section (902) breaks, so that the vertical tube (901) and the horizontal tube (903) are separated.

10. The steel fiber concrete-based bridge reconstruction and expansion wet joint reinforcement device according to claim 9, characterized in that: The top of the vertical tube (901) is axially connected to a limit ring (906), and the limit ring (906) is provided with a plurality of limit holes (908) arranged at equal intervals in the circumferential direction. A limit rod (909) is radially limited in any two symmetrical limit holes (908), and the limit rod (909) is vertically slidably arranged in the corresponding limit hole (908); The middle part of the limiting rod (909) is arranged to slide vertically with the rotating disk (907); The middle part of the limiting rod (909) is coaxially fixedly connected to a limiting plate (911), and the limiting plate (911) is vertically slidably arranged in a movable groove (913) provided in the rotating disk (907), and a spring (912) is arranged in the movable groove (913), and the spring (912) is sleeved on the outer side of the corresponding limiting rod (909), and the top of the spring (912) is fixedly connected to the bottom of the limiting plate (911), and the bottom of the spring (912) is fixedly connected to the bottom of the inner wall of the movable groove (913); The top ends of the two limiting rods (909) are fixedly connected to the bottom of the same handle (910).

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