Anti-sinking device for main bridge bearing platform steel hanging box cofferdam construction

Abstract

The invention relates to the technical field of steel hanging box construction, in particular to an anti-sinking device for main bridge bearing platform steel hanging box cofferdam construction, which comprises a support base mounted on a prefabricated bottom plate, the support base and the prefabricated bottom plate are fixedly locked by expansion bolts, and a reinforcing rod is mounted on the inner side of the support base. A horizontal plate is fixedly mounted on the inner side of the supporting base and located between the two longitudinal reinforcing rods, a transverse moving block is connected to the outer side of the reinforcing rod close to the upper portion of the supporting base in a sleeving mode, a transverse spring is mounted between the transverse moving block and the reinforcing rod, and an inclined hole is formed in the transverse moving block; a placing frame is arranged above the supporting base and erected at the top of the steel casing, a straight plate is welded to the outer side wall of the placing frame, guide rods are symmetrically welded to the lower end face of the straight plate, the outer walls of the guide rods are sleeved with anti-sinking sliding blocks, a take-up barrel is installed on the side of the straight plate through a supporting arm, and a torsional spring is installed between a rotating shaft of the take-up barrel and the supporting arm; the anti-sinking concrete has the characteristic of good anti-sinking effect.

Description

Technical Field

[0001] The invention relates to the technical field of steel hanging box construction, and in particular to an anti-sinking device for the construction of a steel hanging box cofferdam for a main bridge pedestal. Background Art

[0002] In many fields such as bridge foundation engineering and marine engineering, steel box cofferdam is a commonly used auxiliary structure for foundation construction. Its construction process involves accurately lowering the steel box to the designed bottom elevation, performing anti-sinking tests on it at the elevation, and then carrying out key processes such as pouring the bottom concrete.

[0003] During the lowering of the steel box, the lateral water flow force is an extremely critical and difficult to handle factor. The traditional way of connecting the steel box and the steel casing is to use rigid connectors to connect them from beginning to end to prevent them from sinking. This type of rigid connection method has certain uncertainties in practical applications. For example, during the lowering of the steel box, due to the complex water environment, water flow, waves and other factors, the steel box will inevitably shake and displace. Since the rigid connectors almost do not allow relative displacement, they are very likely to get stuck at the connection point with the steel casing or steel box, which will cause damage to the connector itself or the structure of the connection point, seriously hindering the smooth lowering of the steel box.

[0004] At the same time, when resisting the lateral water flow force, the rigid connectors cannot buffer the impact force when the steel box is first subjected to the impact of the lateral water flow, causing the steel box to bear a large lateral force in the initial stage, posing a threat to the structural safety of the steel box and the connectors. In addition, after being subjected to the impact of lateral water flow for a long time, the rigid connectors are prone to stress concentration at the connection parts, which significantly increases the risk of local fatigue failure and is not conducive to the stability of the steel box during the entire construction period.

[0005] Therefore, it is necessary to provide an anti-sinking device for the construction of the main bridge pedestal steel box cofferdam to solve the above technical problems. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an anti-sinking device for the construction of a main bridge pedestal steel hanging box cofferdam.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an anti-sinking device for the construction of a steel hanging box cofferdam of a main bridge pedestal, comprising a support base installed on a prefabricated bottom plate, the support base and the prefabricated bottom plate are fixed and locked with expansion bolts, a reinforcing rod is installed on the inner side of the support base, a horizontal plate is fixedly installed on the inner side of the support base and located between two longitudinal reinforcing rods, a transverse block is sleeved on the outer side of the reinforcing rod near the top of the support base, a transverse spring is installed between the transverse block and the reinforcing rod, and an inclined hole is opened inside the transverse block; A placing frame is provided above the supporting base, and the placing frame is mounted on the top of the steel casing, a straight plate is welded on the outer wall of the placing frame, a guide rod is symmetrically welded on the lower end surface of the straight plate, an anti-sinking slider is sleeved on the outer wall of the guide rod, a wire take-up drum is installed on the side of the straight plate through a support arm, a torsion spring is installed between the rotating shaft of the wire take-up drum and the support arm, and the built-in traction line of the wire take-up drum passes through the straight plate and is embedded in the top of the anti-sinking slider, a supporting rod is symmetrically welded on the bottom of the anti-sinking slider, a first positioning plate is welded on the bottom of the supporting rod, a through hole is opened at the center position inside the first positioning plate, a round rod is inserted in the through hole, a second positioning plate is welded on the bottom of the round rod, a cross plate is welded on the top of the round rod, a triangular plate is welded on the top of the cross plate, and the inclined surface of the triangular plate contacts one end of the transverse moving block but is not connected; An anti-sinking connector is arranged between the support base and the placement frame. The anti-sinking connector is a non-magnetic metal component and its diameter is consistent with the inclined hole. The anti-sinking connector is integrally cast by a spherical portion, a connecting rod portion and a concave ball sleeve portion. The anti-sinking connector has a placement hole built in it. The spherical portion and the concave ball sleeve portion between two adjacent anti-sinking connectors are mutually socketed. The first anti-sinking connector is fixedly connected to the anti-sinking slider, and the tail anti-sinking connector is fixedly installed inside the support base. Each placement hole is combined into a placement channel, a metal rod is arranged in the placement channel, and the metal rod is a non-magnetic metal. Magnets are installed at both ends of the metal rod. A working gap is formed between the two adjacent metal rods due to the repulsion of the same magnets, and the working gap is located at the connection between the two anti-sinking connectors.

[0008] Preferably, the end surface of the winding drum shaft is symmetrically welded with limit bars, a limit slider is arranged between the two limit bars, a threaded rod is welded at the center position of one side of the limit slider, and the threaded rod, the limit slider and the winding drum shaft are coaxially arranged concentrically, a sleeve block with an internal thread groove is installed at the end of the threaded rod through threaded cooperation, and the sleeve block is fixed to one side of the straight plate through a square rod, and the square rod and the straight plate are fixed with bolts.

[0009] Preferably, an inner circular groove is opened at one end of the sleeve block, and the inner circular groove and the inner thread groove are combined to form a through hole, and a locking pin is horizontally placed in the through hole, and an inclined plate is arranged at a position below the wire take-up reel, and the inclined plate is fixedly connected to the first metal rod, and an axle frame is fixedly installed on the side of the straight plate, and a turntable is rotatably installed on one side of the axle frame, and a driving rope is wrapped around the inner wall of the turntable, and the free end of the driving rope is fixedly connected to the top of the inclined plate, and an arc-shaped extrusion plate is welded on the inner wall of the turntable, and the arc-shaped extrusion plate is opposite to the locking pin, and the thickness of the arc-shaped extrusion plate gradually increases along the circumferential direction.

[0010] Preferably, the end surface of one end of the transverse displacement block facing the triangular plate is an arc surface.

[0011] Preferably, rectangular holes are symmetrically opened on the inner side of the anti-sinking sliding block, and a horizontal rod is welded to the guide rod along its path direction, and one end of the horizontal rod abuts against the outer wall of the steel casing.

[0012] Preferably, the connection between the spherical portion and the concave ball sleeve portion is coated with lubricating grease.

[0013] Preferably, a truss is installed between the two placement racks in the horizontal direction, the installation height of the truss is lower than the horizontal height of the top of the steel casing, and the truss and the placement rack are locked and fixed by bolts.

[0014] Preferably, the horizontal plate and the support base are detachably fixedly connected.

[0015] Compared with the related art, the anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam provided by the present invention has the following beneficial effects: The present invention provides an anti-sinking device for the construction of a steel box cofferdam for a main bridge pedestal. The present invention is provided with an anti-sinking connector, which can be changed from a flexible part to a rigid part according to the lowering state of the steel box. When used as a flexible part, a plurality of anti-sinking connectors 3 that can be regarded as flexible parts can better adapt to the position change of the steel box, buffer the lateral force of the water flow on the steel box, and allow the displacement caused by the shaking of the steel box to a certain extent, avoiding excessive additional stress caused by a small change in the position of the steel box, and the flexible part has less interference with the steel casing during the lowering process of the steel box. The rigid part may get stuck or have excessive friction with the steel casing due to the position deviation of the steel box, while the flexible part can reduce this resistance through its own deformation, which is conducive to the smooth lowering of the steel box to the designed bottom elevation.

[0016] The present invention provides an anti-sinking device for the construction of a steel box cofferdam of a main bridge pedestal. When the steel box is lowered to contact the designed bottom elevation, the anti-sinking connecting piece can be transformed from a flexible piece to a rigid piece. After being transformed from a flexible piece to a rigid piece, the anti-sinking connecting piece can more accurately transmit the lateral force to the steel casing, so that the steel box and the steel casing can resist the impact of the water flow as a whole. During the subsequent pumping and pouring of the pedestal, the steel box has higher stability and a higher anti-sinking effect.

[0017] The present invention provides an anti-sinking device for the construction of the cofferdam of the steel hanging box of the main bridge pedestal. The present invention is provided with components such as a turntable. When the position of the inclined plate is lowered, the driving rope will be pulled, and the driving rope will drive the turntable to rotate on the axle frame. After the turntable rotates, the arc extrusion plate is synchronously driven to rotate together. The thin edge of the arc extrusion plate first contacts with the locking pin and then gradually slides into contact. During the contact process, the arc extrusion plate generates a lateral extrusion force on the locking pin, so that the other end of the locking pin abuts against the head of the threaded rod, and the threaded rod is locked relative to the feeding position of the sleeve block. In this way, the positioning of the threaded rod can be adaptively completed during the process of hoisting the steel hanging box, that is, the longitudinal anti-sinking effect can be adaptively achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the present invention is three-dimensional Figure 1 ; Figure 2 The overall structure of the present invention is three-dimensional Figure 2 ; Figure 3 It is a three-dimensional diagram of part of the structure of the present invention; Figure 4 For the present invention Figure 1 A partial enlarged schematic diagram of the middle A area; Figure 5 For the present invention Figure 2 A partial enlarged schematic diagram of the middle B area; Figure 6 For the present invention Figure 3 A partial enlarged schematic diagram of the middle C area; Figure 7 It is a cross-sectional view of the supporting base and other components of the present invention; Figure 8 For the present invention Figure 7 A partial enlarged schematic diagram of the D area in the middle; Numbers in the figure: 1, support base, 2, placement frame, 3, anti-sinking connector, 4, truss, 11, reinforcement rod, 12, horizontal plate, 13, transverse block, 14, transverse spring, 15, inclined hole, 21, straight plate, 22, take-up drum, 23, guide rod, 24, support rod, 25, first positioning plate, 26, round rod, 27, second positioning plate, 28, transverse plate, 29, triangle plate, 31, spherical part, 32, , connecting rod part, 33, concave ball sleeve part, 34, placement hole, 35, metal rod, 36, magnet, 220, locking pin, 221, traction line, 222, shaft frame, 223, turntable, 224, arc extrusion plate, 225, driving rope, 226, limiting bar, 227, limiting slider, 228, threaded rod, 229, sleeve block, 351, inclined plate, 231, anti-sinking slider, 230, rectangular hole. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] In addition, the terms used below are defined based on the functions of the present invention and may differ depending on the intention or custom of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0021] See also Figure 1-Figure 8The anti-sinking device for the construction of the steel hanging box cofferdam of the main bridge pedestal described in the present invention comprises a support base 1 installed on a prefabricated bottom plate, the support base 1 and the prefabricated bottom plate are fixed and locked with expansion bolts, in the actual construction process, a hole is opened at the design elevation of the steel casing, and the assembly platform support beam is installed. After the prefabricated bottom plate is hoisted in place in blocks, the support base 1 can be installed, and the support base 1 is detachable relative to the prefabricated bottom plate; After the support base 1 is installed, the wet joint steel bars are tied on the prefabricated bottom plate and the wet joint concrete is poured; A reinforcing rod 11 is installed on the inner side of the support base 1. The reinforcing rod 11 is conventionally fixed by welding. A horizontal plate 12 is fixedly installed on the inner side of the support base 1 and between the two longitudinal reinforcing rods 11. A transverse block 13 is sleeved on the outer side of the reinforcing rod 11 near the top of the supporting base 1, and a transverse spring 14 is installed between the transverse block 13 and the reinforcing rod 11. An inclined hole 15 is opened inside the transverse block 13. Under normal conditions, the elastic force of the transverse spring 14 acts on the inner side of the transverse block 13, and the transverse block 13 and the transverse spring 14 are close to the reinforcing rod 11 in the back direction. A placement rack 2 is arranged above the support base 1. The placement rack 2 is arranged on the top of the steel casing. A straight plate 21 is welded to the outer wall of the placement rack 2. A guide rod 23 is symmetrically welded to the lower end surface of the straight plate 21. The guide rod 23 is made of high-strength metal material to ensure that it does not deform in the horizontal direction. The outer wall of the guide rod 23 is sleeved with an anti-sinking slider 231, and the anti-sinking slider 231 can be vertically displaced relative to the guide rod 23. In actual use, the outer wall of the guide rod 23 can be sprayed with an anti-corrosion coating to prevent it from being corroded by seawater or other impurities. At the same time, in order to reduce the sliding friction between the anti-sinking slider 231 and the guide rod 23, a ball bearing can also be added at the connection between the two. A wire take-up drum 22 is installed on the side of the straight plate 21 through a support arm, a torsion spring is installed between the rotating shaft of the wire take-up drum 22 and the support arm, and a built-in traction line 221 of the wire take-up drum 22 passes through the straight plate 21 and is embedded in the top of the anti-sinking slider 231. When the wire take-up drum 22 is unwound, one side of the rotating shaft compresses the torsion spring, and the rebound force generated by the compression of the torsion spring will act on the wire take-up drum 22 to drive the built-in traction line 221 to have a vertical upward pulling force; A support rod 24 is symmetrically welded to the bottom of the anti-sinking slider 231, and a first positioning plate 25 is welded to the bottom of the support rod 24. The first positioning plate 25 is located in the gap between the prefabricated bottom plate and the steel casing. A through hole is opened at the center of the first positioning plate 25, and a round rod 26 is inserted in the through hole. A second positioning plate 27 is welded to the bottom of the round rod 26, and a cross plate 28 is welded to the top of the round rod 26. A triangular plate 29 is welded to the top of the cross plate 28. The inclined surface of the triangular plate 29 contacts one end of the transverse block 13 but is not connected. When the steel hanging box is not lowered, the round rod 26 will slide down along the through hole under the action of gravity, and the end position is that the cross plate 28 rests on the bottom of the support base 1. At this time, the initial horizontal height of the second positioning plate 27 is lower than the lower end surface of the support base 1. An anti-sinking connector 3 is provided between the support base 1 and the placement rack 2. The anti-sinking connector 3 is a non-magnetic metal component and its diameter is consistent with the inclined hole 15. The anti-sinking connector 3 is integrally cast by a spherical portion 31, a connecting rod portion 32 and an inner concave ball sleeve portion 33. The anti-sinking connector 3 should be installed as an integral part with the placement rack 2 in advance, and the anti-sinking connector 3 is partially installed while the placement rack 2 is installed by hoisting (partial installation means that the anti-sinking connector 3 at the end is not fixed to the support base 1); At the same time, the anti-sinking connector 3 integrally casted above should be cut in half, and the cut anti-sinking connector 3 is then bolted to form a whole. The connector 3 can also be directly cast into a half shape during integral casting. This method is convenient for the anti-sinking connectors 3 to be installed with each other and can be detached from each other. The anti-sinking connector 3 has a placement hole 34 built in it, and the spherical part 31 and the concave ball sleeve part 33 between two adjacent anti-sinking connectors 3 are sleeved with each other. The first anti-sinking connector 3 is fixedly connected to the anti-sinking slider 231, and the connection and fixation of the first anti-sinking connector 3 should be performed before the placement frame 2 is hoisted; The tail anti-sinking connector 3 is fixedly installed inside the support base 1, and the connection and fixing of the tail anti-sinking connector 3 should be performed after the placement frame 2 is hoisted; Each placement hole 34 is combined into a placement channel, in which a metal rod 35 is arranged, and the metal rod 35 is a non-magnetic metal, and magnets 36 are installed at both ends of the metal rod 35. There is a working gap between two adjacent metal rods 35 due to the repulsion of the two magnets 36. After the anti-sinking connector 3 is fixed to the support base 1 and the placement frame 2, several anti-sinking connectors 3 are coaxial with each other; according to Figure 4As shown, the top of the anti-sinking slider 231 is designed with a mounting hole, and the mounting hole is connected to the placement channel. That is, when installing the magnet 36, it is only necessary to insert a plurality of magnets 36 into the placement channel through the mounting hole. The bottom of the first magnet 36 will be placed on the upper end surface of the transverse block 13. When the magnets 36 matching the number of the anti-sinking connectors 3 are completely placed in the placement channel, their initial positions can be referred to. Figure 7 As shown, adjacent magnets 36 have the working gap under the action of like-charge repulsion, and the working gaps are marked as L1, L2, ... from bottom to top. The working gaps are all located at the connection between the two anti-sinking connectors 3, that is, the connection between the spherical portion 31 and the concave ball sleeve portion 33. At this time, the metal rods 35 at each position have no interference with the mutual deflection of the two adjacent anti-sinking connectors 3, that is, the adjacent anti-sinking connectors 3 can be regarded as flexible parts and can move relative to each other; In the actual initial state, since there are multiple metal rods 35, the high-position metal rods 35 have a cumulative gravity on the low-position metal rods 35, such as Figure 7 The working gaps L1, L2, etc. should be gradually increased, but they all meet the requirement that the working gaps at each position are at the connection between the two anti-sinking connectors 3, and the connection between the spherical part 31 and the concave ball sleeve part 33 is coated with lubricating grease; After all the above-mentioned components at each position are installed, the wall body is symmetrically hoisted (the wall body is not shown in the attached drawings). After the single wall body is hoisted, it is fixed and closed and integrated with the prefabricated bottom plate to form a steel hanging box. This process is the prior art and will not be described in detail. During specific operation, the steel hanging box is continuously and synchronously lowered to the designed bottom elevation by the jack. The anti-sinking slider 231 will slide vertically along the outer wall of the guide rod 23 and drive the traction line 221 to separate from the take-up drum 22. The vertical upward pulling force of the traction line 221 acts on the anti-sinking slider 231, so that the anti-sinking slider 231 and several anti-sinking connectors 3 will not slide down under their own gravity. The anti-sinking connectors 3 at each position are in a coaxial state. In this process, the several anti-sinking connectors 3, which can be regarded as flexible parts, can better adapt to the position change of the steel hanging box, buffer the lateral force of the water flow on the steel hanging box, allow the displacement caused by the shaking of the steel hanging box to a certain extent, and avoid excessive additional stress caused by small changes in the position of the steel hanging box. In addition, the flexible parts have less interference with the steel casing during the lowering of the steel hanging box. Rigid parts may get stuck or have excessive friction with the steel casing due to the position deviation of the steel hanging box, but the flexible parts can reduce this resistance through their own deformation, which is conducive to the smooth lowering of the steel hanging box to the designed bottom elevation; At the same time, in the above process, the second positioning plate 27 first contacts the designed bottom elevation of the steel hanging box, and then continues to be lowered until the prefabricated bottom plate contacts the designed bottom elevation. The round rod 26 moves upward relative to the through hole until the bottom of the second positioning plate 27 coincides with the lower end surface of the prefabricated bottom plate, and the upper end surface of the second positioning plate 27 contacts the lower end surface of the first positioning plate 25. During the upward movement of the round rod 26, the cross plate 28 and the triangular plate 29 are driven to rise synchronously. After the triangular plate 29 rises, its oblique edge squeezes one end of the transverse movement block 13, so that the transverse movement block 13 is laterally displaced on the reinforcing rod 11 until the inclined hole 15 reaches the bottom of the lowest metal rod 35, and the metal rod 35 falls directly to the top of the horizontal plate 12. When the spacing between the lateral block 13 and the horizontal plate 12 is greater than the spacing between the magnet 36 and the connection between the two adjacent anti-sinking connectors 3 at the maximum working gap, that is, the working gap at each position will move down to the connecting rod portion 32, and the metal rod 35 at each position will slide down along the placement channel to the connection between the two adjacent anti-sinking connectors 3. The position of the connection between the anti-sinking connectors 3 at each position is locked by the metal rod 3. At this time, the adjacent anti-sinking connectors 3 can be regarded as rigid parts. After being transformed from flexible parts to rigid parts, the anti-sinking connector 3 can more accurately transfer the lateral force to the steel casing, so that the steel hanging box and the steel casing can resist the impact of water flow as a whole, and the stability of the steel hanging box is higher during subsequent pumping and pouring of the foundation. Among them, the end surface of the transverse moving block 13 facing the triangular plate 29 is an arc surface, and the inclined surface of the triangular plate 29 will contact the arc surface during the rising process; In another embodiment, see Figure 2-Figure 8 The end surface of the rotating shaft of the wire take-up drum 22 is symmetrically welded with a limit bar 226, and a limit slider 227 is arranged between the two limit bars 226. In the initial state, the limit slider 227 is close to the end surface of the rotating shaft of the wire take-up drum 22. As the wire take-up drum 22 pays off and rotates, the limit bar 226 welded at one end of the rotating shaft drives the limit slider 227 to rotate together. A threaded rod 228 is welded at the center of one side of the limit slider 227, and the threaded rod 228, the limit slider 227 and the rotating shaft of the take-up drum 22 are coaxially arranged concentrically, and a sleeve block 229 with an internal thread groove is installed at the end of the threaded rod 228 through threaded cooperation, and the rotating limit slider 227 will drive the limit slider 227 to screw into the sleeve block 229; The sleeve block 229 is fixed to one side of the straight plate 21 through a square rod, and the square rod and the straight plate 21 are fixed with bolts. Since the lower distance of the steel hanging box is consistent, the relative fixed position of the square rod and the straight plate 21 can be adjusted in advance according to the lower distance. When the steel hanging box is lowered to the designed bottom elevation, one end of the threaded rod 228 just contacts the inner wall of the internal thread groove inside the sleeve block 229, and the threaded rod 228 cannot feed relative to the sleeve block 229, that is, the wire reel 22 can no longer unwind the traction line 221 (the traction line 221 is a metal cable), and one end of the traction line 221 is locked to the steel casing at the longitudinal position of the anti-sinking slider 231, thereby achieving the longitudinal anti-sinking effect.

[0022] In another embodiment, see Figure 1-Figure 8 An inner circular groove is formed at one end of the sleeve block 229, and a through hole is formed between the inner circular groove and the inner thread groove. A locking pin 220 is horizontally placed in the through hole, and the locking pin 220 can move horizontally in the through hole; An inclined plate 351 is provided below the take-up drum 22. The inclined plate 351 is fixedly connected to the first metal rod 35. The weight of the metal rod 35 is much greater than that of the inclined plate 351. The distance between the magnet 36 at one end of the first metal rod 35 and the connection between the two adjacent anti-sinking connectors 3 should be less than the height of the first metal rod 35 relative to the anti-sinking slider 231. When the metal rod 35 slides down along the placement channel, the first metal rod 35 at the top position will drive the inclined plate 351 to move downward together. The straight plate 21 is fixedly mounted with an axis frame 222 on the side thereof, and a turntable 223 is rotatably mounted on one side of the axis frame 222. A driving rope 225 is wound around the inner wall of the turntable 223, and only the end of the driving rope 225 is fixed to the outer wall of the turntable 223. The driving rope 225 can be an elastic member or a non-elastic member, and the winding method is as follows: Figure 4 As shown, the free end of the driving rope 225 is fixedly connected to the top of the inclined plate 351, and the inner wall of the rotating disk 223 is welded with an arc-shaped extrusion plate 224, which is opposite to the locking pin 220, and the thickness of the arc-shaped extrusion plate 224 gradually increases along the circumferential direction. During specific operation, when the inclined plate 351 is lowered, the driving rope 225 will be pulled, and the driving rope 225 will drive the rotating disk 223 to rotate on the shaft frame 222. After the rotating disk 223 rotates, the arc-shaped extrusion plate 224 is synchronously driven to rotate together, and the thin edge of the arc-shaped extrusion plate 224 first contacts with the locking pin 220 and gradually slides into contact. During the contact process, the arc-shaped extrusion plate 224 generates a lateral extrusion force on the locking pin 220, so that the other end of the locking pin 220 abuts against the head of the threaded rod 228, and the threaded rod 228 is locked in the feeding position relative to the sleeve block 229. In this way, the positioning of the threaded rod 228 can be adaptively completed during the process of hoisting the steel hanging box, that is, the longitudinal anti-sinking effect can be adaptively achieved.

[0023] Furthermore, a rectangular hole 230 is symmetrically provided on the inner side of the anti-sinking slider 231, and a horizontal rod is welded along the path direction of the guide rod 23. One end of the horizontal rod abuts against the outer wall of the steel casing. The horizontal rod can effectively increase the stability of the guide rod 23, making it less likely to deform in the horizontal direction during the construction process. The width of the rectangular hole 230 should be greater than the diameter of the horizontal rod, so as to ensure that the anti-sinking sliding block 231 can move on the guide rod 23 with the horizontal rod added.

[0024] It should be noted that the shape of the placement frame 2 in the attached drawings of the specification only represents one of many appearance shapes. As long as any shape can be sleeved on the top of the steel casing, it can be installed. A truss 4 is installed horizontally between the two placement frames 2. The installation height of the truss 4 is lower than the horizontal height of the top of the steel casing. The truss 4 and the placement frame 2 are locked and fixed by bolts. The placement frame 2 is further locked in position by the truss 4 to prevent it from circumferential movement.

[0025] The horizontal plate 12 and the support base 1 are detachably fixedly connected, and specifically, bolts are used for fixing the connection. In this way, the horizontal plate 12 can be quickly removed in subsequent work, thereby facilitating the recovery and disassembly of the metal rods 35 at various positions.

[0026] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An anti-sinking device for the construction of a steel box cofferdam for a main bridge cap, comprising a support base (1) installed on a prefabricated bottom plate, characterized in that: The support base (1) and the prefabricated bottom plate are fixed and locked by expansion bolts, a reinforcing rod (11) is installed on the inner side of the support base (1), a horizontal plate (12) is fixedly installed on the inner side of the support base (1) and between the two longitudinal reinforcing rods (11), a transverse block (13) is sleeved on the outer side of the reinforcing rod (11) near the top of the support base (1), and a transverse spring (14) is installed between the transverse block (13) and the reinforcing rod (11), and an inclined hole (15) is opened inside the transverse block (13); A placement frame (2) is arranged above the support base (1), the placement frame (2) is arranged on the top of the steel casing, a straight plate (21) is welded to the outer wall of the placement frame (2), a guide rod (23) is symmetrically welded to the lower end surface of the straight plate (21), an anti-sinking slider (231) is sleeved on the outer wall of the guide rod (23), a wire take-up drum (22) is installed on the side of the straight plate (21) through a support arm, a torsion spring is installed between the rotating shaft of the wire take-up drum (22) and the support arm, and a traction line (221) built into the wire take-up drum (22) passes through the straight plate (21) and is embedded in the anti-sinking slider (231) top, the bottom of the anti-sinking slider (231) is symmetrically welded with a support rod (24), the bottom of the support rod (24) is welded with a first positioning plate (25), a through hole is opened at the center position inside the first positioning plate (25), a round rod (26) is inserted in the through hole, a second positioning plate (27) is welded at the bottom of the round rod (26), a cross plate (28) is welded at the top of the round rod (26), a triangular plate (29) is welded at the top of the cross plate (28), and the inclined surface of the triangular plate (29) contacts one end of the transverse moving block (13) but is not connected; An anti-sinking connector (3) is provided between the support base (1) and the placement frame (2). The anti-sinking connector (3) is a non-magnetic metal component and its diameter is consistent with the inclined hole (15). The anti-sinking connector (3) is integrally cast by a spherical portion (31), a connecting rod portion (32) and an inner concave ball sleeve portion (33). The anti-sinking connector (3) has a placement hole (34) built therein. The spherical portions (31) and the inner concave ball sleeve portions (33) between two adjacent anti-sinking connectors (3) are mutually sleeved. The first anti-sinking connector (3) and the inner concave ball sleeve portion (33) are mutually sleeved. The anti-sinking slider (231) is fixedly connected, the tail anti-sinking connector (3) is fixedly installed inside the support base (1), each placement hole (34) is combined to form a placement channel, a metal rod (35) is arranged in the placement channel, and the metal rod (35) is a non-magnetic metal, magnets (36) are installed at both ends of the metal rod (35), and a working gap is formed between two adjacent metal rods (35) due to the repulsion of the two magnets (36), and the working gap is located at the connection between the two anti-sinking connectors (3).

2. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: A limit bar (226) is symmetrically welded to the end surface of the rotating shaft of the take-up drum (22), a limit slider (227) is arranged between the two limit bars (226), a threaded rod (228) is welded at a central position on one side of the limit slider (227), and the threaded rod (228), the limit slider (227) and the rotating shaft of the take-up drum (22) are coaxially arranged concentrically, a sleeve block (229) having an internal thread groove is installed at the end of the threaded rod (228) through threaded matching, and the sleeve block (229) is fixed to one side of the straight plate (21) through a square rod, and the square rod and the straight plate (21) are fixed by bolts.

3. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 2 is characterized in that: An inner circular groove is formed at one end of the sleeve block (229), and a through hole is formed between the inner circular groove and the inner thread groove. A locking pin (220) is horizontally placed in the through hole. An inclined plate (351) is provided below the wire take-up drum (22), and the inclined plate (351) is fixedly connected to the first metal rod (35). An axle frame (222) is fixedly installed on the side of the straight plate (21), and a turntable (223) is rotatably installed on one side of the axle frame (222). A driving rope (225) is wound around the inner wall of the turntable (223), and the free end of the driving rope (225) is fixedly connected to the top of the inclined plate (351). An arc-shaped extrusion plate (224) is welded to the inner wall of the turntable (223), and the arc-shaped extrusion plate (224) faces the locking pin (220), and the thickness of the arc-shaped extrusion plate (224) gradually increases along the circumferential direction.

4. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: The end surface of one end of the transverse movement block (13) facing the triangular plate (29) is an arc surface.

5. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: Rectangular holes (230) are symmetrically provided inside the anti-sinking sliding block (231), and a horizontal rod is welded to the guide rod (23) along its path direction, with one end of the horizontal rod abutting against the outer wall of the steel casing.

6. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: The connection between the spherical portion (31) and the concave ball sleeve portion (33) is coated with lubricating grease.

7. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: A truss (4) is installed between the two placement frames (2) in the horizontal direction. The installation height of the truss (4) is lower than the horizontal height of the top of the steel casing. The truss (4) and the placement frame (2) are locked and fixed by bolts.

8. The anti-sinking device for the construction of the main bridge cap steel hanging box cofferdam according to claim 1 is characterized in that: The horizontal plate (12) and the support base (1) are detachably fixedly connected.

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