A steel box girder bridge plate hoisting structure and a hoisting method

Abstract

The application relates to the technical field of bridge construction equipment, in particular to a steel box girder bridge plate hoisting structure and a hoisting method. The steel box girder bridge plate hoisting structure comprises a base, a traction wheel rotatably arranged on the base, static friction discs fixed on the two sides of the traction wheel, a support fixed on the base, dynamic friction discs slidably arranged on the support, and driving rods abutting against the two dynamic friction discs; a plurality of clamping grooves are annularly arranged on the traction wheel hub; a locking rod is rotatably arranged on the base and always has a tendency to move away from the clamping grooves under the action of an elastic element; a pull rope is arranged at the end of the locking rod and connected with the driving rod at the other end of the dynamic friction disc. The traction wheel braking is changed, in addition to the friction braking between the dynamic friction disc and the static friction disc, a rigid locking structure of the locking rod inserted into the traction wheel hub is further arranged. Compared with the traditional compression type friction braking, the combination of the friction braking and the rigid locking is equivalent to the rigid braking mode of the inserted locking, and the rigid braking mode of the inserted locking is more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction equipment, and particularly relates to a steel box girder bridge plate hoisting structure and a hoisting method. BACKGROUND

[0002] The steel box girder, also known as a steel plate box girder, is a commonly used structure form of a large-span bridge. The main body thereof is composed of a top plate, a bottom plate, a web plate and a transverse plate welded to form a closed box section. The steel box girder has the technical advantages of large resistance stiffness, strong integrity, outstanding span capacity and the like. The steel box girder is often prefabricated into a standard segment and is used by being hoisted and spliced in the engineering fields of a highway overpass hub, a cross-line bridge and a large-span cable-stayed bridge.

[0003] In the construction process of the steel box girder bridge, the hoisting of the standard segment plate is mostly performed by using a track-type shunting hoisting system and a fixed gantry crane hoisting system.

[0004] The main equipment of the track-type shunting hoisting system is a crane. Double parallel tracks are arranged on the bridge surface / edge side or on the ground (in the case of a low distance from the ground), and a walking trolley is arranged on the double tracks. The crane is arranged on the trolley. In use, the prefabricated steel box girder segment is first transported to the bridge position by using a track transport vehicle. Then, the trolley hydraulic lifting device is started to lift the component to a predetermined height. The hoisting posture is adjusted by using a luffing mechanism. Finally, the transverse positioning is completed by using a synchronous walking system, so as to complete the hoisting operation.

[0005] The core of the fixed gantry crane hoisting system is a gantry crane. A heavy-duty gantry crane is arranged on both sides of the pier. The vertical hoisting is performed by using an electric hoist under the main beam.

[0006] Both the above-mentioned hoisting systems can hoist the steel box girder. However, both of them have the following problems in the motion control: the components are easily swung in three-dimensional space due to the influence of the wind load, the inertial load and the operation error during hoisting. Especially when the large-span hoisting is performed by using the gantry crane, the transverse shaking of the framework is easily generated at the end of the longitudinal movement, which seriously affects the butt joint precision, and then affects the bridge linear structure control and the engineering safety. Meanwhile, in the hoisting suspension braking aspect, the dynamic braking of the traction device is one of the basic conditions for ensuring the hoisting stability. The traditional friction disc brake and the hydraulic brake have the heat recession phenomenon during continuous operation. The braking response time is prolonged compared with the initial operation state, which causes the deviation of the positioning precision. In addition, in the equipment power failure working condition, the emergency locking is lacked, and the hook slipping safety hazard exists.

[0007] To this end, the present application provides a steel box girder bridge plate hoisting structure and hoisting method, a three-level braking guarantee system is constructed, and braking structures are additionally arranged at the output and transmission process of the transmission equipment, and in particular, a rigid locking system is extended on the basis of the transmission braking at the traction wheel, precise control of the whole working condition of the hoisting process is realized, and reliable technical guarantee is provided for the safe hoisting of the steel box girder. SUMMARY

[0008] The present application aims at solving the problems in the prior art and provides a steel box girder bridge plate hoisting structure and hoisting method.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0010] A steel box girder bridge plate hoisting structure comprises a base, a traction wheel is rotatably installed on the base, the traction wheel can be forward and reverse rotated and braked through a driving structure; a steel strand is wound on the traction wheel, the steel strand is driven by a sequencing mechanism to be sequentially and reciprocally spirally wound on the traction wheel, a lifting frame is fixed to the suspension end of the steel strand, and a plurality of lifting hooks for lifting the steel box girder bridge plate are arranged around the lifting frame.

[0011] Static friction discs are fixed to the opposite sides of the wheel hubs of the traction wheel, supports are fixed to the base on the opposite sides of the two static friction discs, dynamic friction discs are slidably installed on the supports in the axial direction of the traction wheel, driving rods are abutted to the opposite sides of the two dynamic friction discs, the driving rods are rotatably installed on the supports, and the driving rods are driven by an extension rod to be deflected.

[0012] A plurality of clamping grooves are annularly arranged on the wheel hubs of the traction wheel, locking rods corresponding to the clamping grooves are rotatably installed on the base on the side of the wheel hubs of the traction wheel, the locking rods always have a tendency to move away from the clamping grooves under the action of elastic members, pull ropes are arranged at the end portions of the locking rods, and the other ends of the pull ropes are connected to one end of the dynamic friction disc.

[0013] Preferably, the locking rods are movably arranged, the locking rods are suspended and installed on the side of the wheel hubs of the traction wheel through the elastic members, a through groove is arranged on the base for the lower end of the locking rod to pass through, and a limiting member is arranged at the lower end of the locking rod.

[0014] Preferably, a steel cable is arranged at the lower end of the locking rod, the steel cable passes through the through groove, and the limiting member is arranged at the lower end of the steel cable.

[0015] Preferably, the driving structure comprises a motor and a transmission box fixed to the base, a gear reduction mechanism is arranged in the transmission box, and a worm and gear mechanism is arranged in the transmission box between the gear reduction mechanism and the output shaft of the motor.

[0016] Preferably, the base is further provided with a brake mechanism for assisting the motor, the brake mechanism comprising a stand provided on the base, a pressure rod rotatably mounted on the upper end of the stand, the pressure rod being driven to reciprocate and deflect by a telescopic rod rotatably mounted on the base, a rocker rotatably mounted on the middle of the pressure rod, a beam provided on the end of the rocker, a V-shaped frame inserted on the beam, a brake I rotatably connected to the bending part of the V-shaped frame, a connecting rod rotatably connected to the other end of the V-shaped frame, a brake II rotatably connected to the other end of the connecting rod, the brake I and the brake II being rotatably mounted on the stand and symmetrically arranged along the motor output shaft, and brake shoes being provided on the brake I and the brake II.

[0017] Preferably, the brake disc is fixed on the output shaft of the motor, and the brake I and the brake II are symmetrically arranged along the two sides of the brake disc.

[0018] Preferably, the sorting mechanism comprises a reciprocating screw rod rotatably mounted on the side of the traction sheave, the reciprocating screw rod being arranged axially parallel to the traction sheave, a wire arranging ring sliding horizontally relative to the base being threadedly mounted on the reciprocating screw rod, a wire guide ring being fixed on the base on the side of the reciprocating screw rod away from the traction sheave, two wire guide wheels being vertically and symmetrically rotatably mounted on the base on the side of the wire guide ring away from the wire arranging ring, annular grooves being provided on the outer edge surfaces of the two wire guide wheels, and the suspension end of the steel strand being sequentially threaded through the annular grooves of the wire arranging ring, the wire guide ring and the wire guide wheels.

[0019] Preferably, the outer edge surfaces of the hubs on the two sides of the traction sheave are both bent towards each other.

[0020] Preferably, a plurality of electric hoists are arranged around the lower end of the base, and the output ends of the electric hoists are respectively hooked to the hanging frames.

[0021] A steel box girder bridge plate hoisting method, comprising:

[0022] S1: the lower hoist is pre-hung.

[0023] S2: the steel box girder is wound and lifted.

[0024] S3: the steel box girder is shifted and adjusted.

[0025] S4: the steel box girder is assembled.

[0026] S5: the equipment returns to the steel box girder parking position, and steps S1-4 are repeated to repeatedly hoist and splice, so as to complete the bridge splicing.

[0027] Compared with the prior art, the present application provides a steel box girder bridge plate hoisting structure and hoisting method, which has the following beneficial effects:

[0028] 1. The invention, in the traction sheave braking, in addition to setting the friction brake between the dynamic friction disc and the static friction disc, a rigid locking structure of the lock rod inserted into the traction sheave hub is also set. It is equivalent to the traditional friction brake relying on compression only, through the combination of friction brake and rigid locking, the rigid braking mode of the inserted locking is more stable.

[0029] 2. The invention, through the worm and gear mechanism in the driving structure, realizes self-locking, compression friction brake between the dynamic friction disc and the static friction disc, compression brake of the brake mechanism, rigid locking between the lock rod and the clamping groove, realizes multi-stage braking effect, and makes the horizontal moving and hoisting of the steel box girder more stable.

[0030] 3. The invention, a plurality of electric hoists are arranged around the base, in the hoisting process, the electric hoists are used for tensioning and pulling the lifting frame, so as to vertically guide the lifting frame, and weaken the amplitude and probability of the shaking of the steel box girder caused by wind force.

[0031] Other advantages, objects and features of the present invention will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic view of the invention without the lifting frame Figure 1 .

[0033] Figure 2 It is a three-dimensional schematic view of the invention without the lifting frame Figure 2 .

[0034] Figure 3 It is a three-dimensional schematic view of the invention without the lifting frame Figure 3 .

[0035] Figure 4 It is a rear view schematic view of the invention without the vertical plate.

[0036] Figure 5 It is a top view schematic view of the invention Figure 1 .

[0037] Figure 6 It is a left view schematic view of the invention Figure 1 .

[0038] Figure 7 It is a right view schematic view of the invention Figure 1 .

[0039] Figure 8 It is a B-B sectional view schematic view of the invention Figure 4 .

[0040] Figure 9 The present application is Figure 4 The local cross-section of the C-C in the present application is shown.

[0041] Figure 10 The present application is Figure 6 The schematic diagram of the mechanical locking structure of the traction wheel after the telescopic rod is removed in the present application is shown.

[0042] Figure 11 The present application is Figure 10 The schematic diagram of the traction wheel in the present application is shown.

[0043] Figure 12 The present application is

[0044] Figure 13 The present application is Figure 8 The schematic diagram of the radial cross-section of the traction wheel in the present application is shown.

[0045] Figure 14 The present application is Figure 13 The schematic diagram of the rim and disc structure of the traction wheel in the present application is shown.

[0046] Figure 15 The present application is

[0047] Figure 16 The present application is

[0048] Figure 17 The present application is Figure 1 .

[0049] Figure 18 The present application is Figure 2 .

[0050] Figure 19 The present application is

[0051] Figure 20 The present application is

[0052] Figure 21 The present application is

[0053] Figure 22 The present application is

[0054] Figure 23 The present application is Figure 11 The local schematic diagram of D in the present application is shown.

[0055] Figure 24For the stereoscopic display of the present application Figure 4 .

[0056] In the figure: 1, base; 2, frame; 3, motor; 4, transmission box; 5, rotating shaft; 6, wheel disc; 7, wheel rim; 8, traction wheel; 9, steel strand; 10, reciprocating screw; 11, wire arranging ring; 12, wire guide ring; 13, wire guide wheel; 14, mounting seat; 15, static friction disc; 16, dynamic friction disc; 17, support; 18, driving rod; 19, clamping groove; 20, pull rope; 21, locking rod; 22, elastic member I; 23, telescopic rod II; 24, pressing rod; 25, rocker; 26, beam; 27, V-shaped frame; 28, brake I; 29, brake II; 30, brake shoe; 31, brake disc; 32, telescopic rod I; 33, worm and gear mechanism; 34, gear reduction mechanism; 35, brake mechanism; 36, hanging frame; 37, steel cable; 38, elastic member II; 39, hoop; 40, traction rope; 41, connecting rod. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings of the embodiments of the present application. Figures 1-24 The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings of the embodiments of the present application.

[0058] In order to weaken the influence of the heat decay phenomenon of the braking system on the braking response, reduce the safety hazard of hook sliding, and improve the braking of the traction device, the present embodiment provides a steel box girder bridge plate hoisting structure, which comprises a base 1, a traction wheel 8 is rotatably installed on the base 1, the traction wheel 8 can be driven to rotate forward and backward and brake through a driving structure; a steel strand 9 is wound on the traction wheel 8, the steel strand 9 is driven by a sorting mechanism to be sequentially and reciprocally spirally wound on the traction wheel 8, a hanging frame 36 is fixed to the suspension end of the steel strand 9, and a plurality of lifting hooks for lifting the steel box girder bridge plate are arranged on the periphery of the hanging frame 36;

[0059] The static friction disc 15 is fixed to the side away from the hub of the traction wheel 8, the support 17 is fixed to the side away from the hub of the traction wheel 8 on the base 1, the dynamic friction disc 16 is slidably installed on the support 17 along the axial direction of the traction wheel 8, the driving rod 18 abuts against the side away from the dynamic friction disc 16, the straight slot I is arranged in the middle of the driving rod 18 along the length direction, the embedded shaft is slidably installed in the straight slot I, the embedded shaft is suspended on the support 17, and the driving rod 18 is driven by the telescopic rod I 32 to deflect;

[0060] The traction wheel 8 is provided with a plurality of clamping grooves 19 in annular array on both sides of the hub, and the base 1 is provided with a locking rod 21 corresponding to the clamping grooves 19 and rotatably mounted on the side of the hub of the traction wheel 8, the locking rod 21 always has a tendency to move away from the clamping grooves 19 under the action of the elastic member 22, and the end of the locking rod 21 is provided with a pull rope 20 connected with the driving rod 18 at one end of the dynamic friction plate 16.

[0061] The principle details of the embodiment are as follows:

[0062] A steel box girder bridge plate hoisting structure, comprising a base 1, the base 1 is made of pipe or spliced by welding or by bolts, and generally presents a rectangular shape as an installation and movement base.

[0063] Referring to Figs. 1-3, Figure 1 , Figs. 4-6, Figure 2 , Figs. 7-9, Figure 3 , the base 1 is fixed symmetrically with two frames 2, and the two frames 2 are integrally formed by casting. The two frames 2 are fixed with bearing seats, and the inner ring of the bearings in the two bearing seats are jointly installed with a rotating shaft 5, so that the rotating shaft 5 is rotatably installed on the frame 2. The rotating shaft 5 is symmetrically and detachably installed with two wheel discs 6, and the two wheel discs 6 are jointly and detachably installed with a traction wheel 8, and the traction wheel 8 is provided with hubs on both sides, so that the overall vertical cross section presents an H shape. The base 1 is provided with a driving structure, the output end of the driving structure is connected with the rotating shaft 5, the rotating shaft 5 is driven to rotate by the driving structure, and in turn the traction wheel 8 is synchronously rotated, so as to realize the forward and reverse rotation driving of the traction wheel 8; and the driving structure can also realize the primary braking of the traction wheel 8, and realize the positive and negative rotation locking of the traction wheel 8.

[0064] Referring to Figs. 1-3, Figure 13 , Figs. 4-6, Figure 14 , Figs. 7-9, Figure 16 , in order to realize the detachable installation between the traction wheel 8 and the two wheel discs 6, the traction wheel 8 is provided with a rim 7 on the inner circular surface, and the wheel disc 6 and the rim 7 are both provided with a plurality of mounting holes in annular array, and the number of mounting holes is one-to-one corresponding, and then the mounting holes can be fastened and connected by bolts for installation, so as to realize the detachable installation of the traction wheel 8.

[0065] Referring to Fig. 10, Figure 1 , the traction wheel 8 is provided with a steel strand 9, one end of the steel strand 9 is fixed on the traction wheel 8, and the hanging end of the steel strand 9 is spirally wound on the traction wheel 8. The base 1 is provided with a sorting mechanism, the steel strand 9 is guided by the sorting mechanism, so that the steel strand 9 is spirally arranged on the traction wheel 8 in sequence, and the random misalignment of the steel strand 9 does not affect the stability of the winding. The traction wheel 8 is provided with a spiral groove for assisting the spiral winding of the steel strand 9 on the bottom layer of the traction wheel 8.

[0066] The hanging end of the steel strand 9 passes through the sequencing mechanism, and a hanging frame 36 is fixedly installed. The hanging frame 36 is provided with a plurality of hooks around the periphery, which are respectively hung at different positions around the steel box girder, so that the steel box girder does not sway due to the shift of the center of gravity during hoisting.

[0067] Referring to the accompanying drawings Figure 11 , the accompanying drawings Figure 15 , the accompanying drawings Figure 16 As shown in the drawings, in order to realize the braking of the traction sheave 8, a friction disc brake or a band brake is generally provided, and the core of the two is to rely on friction braking. In this embodiment, the friction disc brake is taken as an example: including a static friction disc 15 and a dynamic friction disc 16. The static friction disc 15 is provided with two groups, which are respectively fixedly installed on the opposite sides of the wheel hubs of the traction sheave 8 through bolts, so that the static friction disc 15 is exposed.

[0068] Referring to the accompanying drawings Figure 9 , the accompanying drawings Figure 10 , the accompanying drawings Figure 11 As shown in the drawings, two brackets 17 are fixedly installed on the two frames 2 on the base 1 through bolts, and the bracket 17 in the drawings presents an arch bridge shape. Two horizontal guide sleeves are symmetrically arranged on the bracket 17, and a guide column is embedded in each of the two guide sleeves. The two guide columns are fixedly connected at the same end and the dynamic friction disc 16 is arranged on the bracket 17. Through the cooperation of the guide column and the guide sleeve, the dynamic friction disc 16 can axially slide relative to the static friction disc 15.

[0069] A driving rod 18 is rotatably installed on the upper end of the bracket 17. One end of the driving rod 18 abuts against the end face of the dynamic friction disc 16, and the other end of the driving rod 18 is suspended. A telescopic rod one 32 is rotatably installed on the side of the bracket 17. The extending end of the telescopic rod one 32 is rotatably connected to the end of the driving rod 18 away from the dynamic friction disc 16. By extending the telescopic rod one 32, the reciprocating deflection of the driving rod 18 is controlled, and then the driving rod 18 moves against the dynamic friction disc 16. Through the extrusion and friction between the dynamic friction disc 16 and the static friction disc 15, the friction braking of the traction sheave 8 is realized. In order to reset the dynamic friction disc 16, an elastic member three is arranged between the guide column and the guide sleeve. Through the elastic tension of the elastic member three, the dynamic friction disc 16 always has a tendency to move away from the static friction disc 15.

[0070] In order to weaken the influence of the heat recession phenomenon of the braking of the traction system on the braking response and reduce the safety hidden danger of the hook sliding, a rigid locking mechanism is arranged in this embodiment. A plurality of clamping grooves 19 are arranged in an annular array on the wheel hubs on both sides of the traction sheave 8. A lock rod 21 corresponding to the clamping grooves 19 is rotatably installed on the bracket 17 on the base 1 and located at the side of the wheel hub of the traction sheave 8. An elastic member one 22 is arranged between the lock rod 21 and the frame 2. The lock rod 21 always has a tendency to move away from the clamping grooves 19 under the pulling action of the elastic member one 22. A pull rope 20 is arranged at the end of the lock rod 21, and the other end of the pull rope 20 is connected to one end of the dynamic friction disc 16.

[0071] According to the above technical scheme:

[0072] In hoisting, the multiple hooks around the hoisting frame 36 are locked on the steel box girder plate material, evenly dispersed, to ensure balanced pulling force and prevent swinging due to gravity shift during hoisting and suspension.

[0073] When the steel box girder plate is hoisted and lifted, the driving structure drives the traction wheel 8 to reverse, and under the traction of the sequencing mechanism, the steel strand 9 is spirally wound or sequentially loosened, avoiding the sequencing disorder of the steel strand 9 and affecting the stability of the traction lifting.

[0074] When the steel box girder plate is hoisted and horizontally moved, the driving structure is self-braked to achieve preliminary locking of the hoisted workpiece. At the same time, the telescopic rod one 32 is retracted, so that the driving rod 18 sinks away from one end of the dynamic friction disc 16, and the driving rod 18 abuts against one end of the dynamic friction disc 16 and is tilted upwards, thereby moving towards the static friction disc 15, until the two are closely fitted. Through the extrusion friction between the dynamic friction disc 16 and the static friction disc 15, a secondary braking effect is achieved.

[0075] At the same time, the driving rod 18 is deflected, and the lock rod 21 is deflected by pulling the pulling rope 20, so that the lock rod 21 gradually contacts the hub of the traction wheel 8 and is embedded in the clamping groove 19, and the lock rod 21 and the clamping groove 19 are mechanically locked to achieve rigid locking of the traction wheel 8.

[0076] When unlocking, the telescopic rod one 32 is extended and reset, thereby driving the driving rod 18 to reverse and deflect, and the driving rod 18 sinks against one end of the dynamic friction disc 16, and the dynamic friction disc 16 is reset under the action of the elastic member three; the pulling rope 20 no longer forms an active pulling force, and the lock rod 21 separates from the clamping groove 19 under the action of the elastic member one 22.

[0077] In summary, the present scheme makes changes to the braking of the traction wheel 8, in addition to the friction braking between the dynamic friction disc 16 and the static friction disc 15, a rigid locking structure of the lock rod 21 inserted into the hub of the traction wheel 8 is also provided. It is equivalent to the traditional pressure type friction braking, which combines friction braking and rigid locking. The rigid braking mode of the inserted locking is more stable.

[0078] In the present scheme, preferably, with reference to the accompanying Figure 10 As shown, a traction rope 40 can also be provided between the end of the lock rod 21 and the end of the driving rod 18 abutting against the dynamic friction disc 16, and a change direction shaft is provided on the base 1 on the side of the lock rod 21 away from the driving rod 18, and the traction rope 40 passes through the change direction shaft. The traction rope 40 and the pulling rope 20 are arranged symmetrically above and below. In this way, when the driving rod 18 sinks against one end of the dynamic friction disc 16, the pulling rope 20 loses the active pulling force, while the traction rope 40 generates the active pulling force, the traction rope 40 and the lock rod 21 move away from the driving rod 18, prompting the lock rod 21 to separate from the clamping groove 19, and ensuring the accuracy of the braking separation.

[0079] In the present scheme, reference is made to the accompanying drawings Figure 13 , the accompanying drawings Figure 14 , the accompanying drawings Figure 16 , the shaft 5 is a stepped shaft, the small-diameter end of the shaft 5 at the bearing seat rotating mounting position, while the middle part is a large-diameter end, the shaft sleeve inner diameter of the wheel disc 6 is the same as the small-diameter diameter of the shaft 5. After the two wheel discs 6 are buckled at both ends of the shaft 5, they are connected by bolts and the wheel rim 7 to form a whole, so that the wheel disc 6 does not need to be positioned axially on the shaft 5, but can be positioned by the shaft step of the shaft 5. The large-diameter section of the shaft 5 is provided with an open limiting groove at both ends, and the shaft sleeve of the wheel disc 6 is provided with a clamping key matched with the limiting groove to form a key connection, so that the wheel disc 6 is clamped on the shaft 5 without the need for fasteners, making the assembly of the traction sheave 8 more convenient and fast.

[0080] In the further embodiment of the present scheme, reference is made to the accompanying drawings Figure 9 , the accompanying drawings Figure 15 In order to lock the fixed end of the steel strand 9 on the traction sheave 8, a through insertion hole is provided on one side of the traction sheave 8, and the insertion hole is inclined. The fixed end of the steel strand 9 extends from the inside of the traction sheave 8 to the outside of the traction sheave 8 through the insertion hole, and is then locked by a plurality of hoops 39, and the end is also locked by an anchor lock (not shown in the drawings), so as to realize the locking of the steel strand 9 through multiple installations.

[0081] Since the fixed end of the steel strand 9 will penetrate the hub of the traction sheave 8 and be locked on the outer surface of the hub, it will affect the installation of the static friction disc 15 at this position. Therefore, in the present embodiment, the static friction disc 15 is assembled on the wheel disc 6. The static friction disc 15 is provided with a counterbore corresponding to the mounting hole of the wheel disc 6, so that the wheel disc 6, the wheel rim 7 and the static friction disc 15 are combined and installed by the same set of bolts, not only realizing the positioning of the static friction disc 15, but also simplifying the assembly steps. And because the counterbore is provided on the static friction disc 15, the bolt and the corresponding nut are designed in a hidden manner, which will not interfere with the compression type friction braking between the static friction disc 15 and the dynamic friction disc 16.

[0082] In the further embodiment of the present scheme, the hoisted steel box girder member has a large weight, and the braking performance of the traction sheave 8 is required to be higher. Although the cooperation of the locking rod 21 and the clamping groove 19 can realize rigid locking in the above-mentioned scheme, the locking rod 21 and the clamping groove 19 will suddenly bear a large load impact after buckling, which is easy to cause the breakage of the rotating part of the locking rod 21. Therefore, in the present embodiment, the scheme is further improved:

[0083] Reference is made to the accompanying drawings Figure 10As shown, the locking rod 21 is movably arranged, and is no longer rotatably mounted on the frame 2, but is suspendedly mounted on the side of the traction sheave 8 hub through the elastic member 22. The frame 2 of the base 1 is provided with a through slot for the lower end of the locking rod 21 to pass through, and the lower end of the locking rod 21 is provided with a limiting member. The size of the limiting member is larger than the caliber of the through slot, so as to avoid the limiting member from being unhooked. The frame 2 is provided with a vertical plate, and the elastic member 22 is fixed on the vertical plate.

[0084] According to the above technical scheme:

[0085] Compared with the rotation of the locking rod 21, the rotation shaft of the locking rod 21 is easy to be broken under stress. At this time, after the locking rod 21 is embedded into the clamping groove 19, the load transmission is concentrated between the limiting member and the frame 2, the stress is separated, and it is not easy to break, thereby improving the stability of the rigid braking.

[0086] In the further embodiment of the present embodiment, the specific driving structure for realizing braking on the basis of ensuring power transmission is provided, and the specific driving structure is shown in Fig. 5. Figure 10 As shown, in order to further reduce the probability of deformation and breakage of the locking rod 21 under stress, the lower end of the locking rod 21 is provided with a steel cable 37, the steel cable 37 passes through the through slot, and the limiting member is arranged at the lower end of the steel cable 37. The steel cable 37 is used to form a flexible connection, and the locking rod 21 is no longer rigid as a whole, and the stress is dispersed and transmitted with the deformation of the steel cable 37, thereby further reducing the probability of breakage.

[0087] In the present embodiment, the elastic member 38 is arranged between the limiting member and the frame 2, so as to prevent the steel cable 37 from being loose, and the elastic member 22 is cooperated, so as to stably suspend the locking rod 21.

[0088] In the further embodiment of the present embodiment, the specific driving structure for realizing braking on the basis of ensuring power transmission is provided, and the specific driving structure is shown in Fig. 5. Figure 20 As shown, the driving structure includes the motor 3 and the transmission box 4 fixed on the base 1, the gear reduction mechanism 34 is arranged in the transmission box 4, and the worm and gear mechanism 33 is arranged in the transmission box 4 between the gear reduction mechanism 34 and the output shaft of the motor 3.

[0089] In the present embodiment, the worm and gear mechanism 33 includes a worm rotatably mounted in the transmission box 4 and a worm shaft. The worm shaft is connected with the output shaft of the motor 3 through a key or a shaft coupling.

[0090] In the present embodiment, the gear reduction mechanism 34 is similar to a reduction box, and includes a gear one rotatably arranged coaxially with the worm, a gear two meshing with the gear one and arranged non-coaxially, a gear three rotatably arranged coaxially with the gear two, a gear four meshing with the gear three and arranged coaxially with the gear one, and the rotation shaft of the gear four is connected with the rotation shaft 5 of the traction sheave 8 through a key or a shaft coupling. The gear two, the gear three and the gear four are rotatably mounted in the transmission box 4, and the gear reduction mechanism 34 is used for speed reduction transmission.

[0091] In this way, the gear reduction mechanism 34 slows down the output speed of the motor 3 to prevent the traction wheel 8 from shaking due to excessive winding speed; the self-locking property of the worm gear mechanism 33 is used to achieve transmission braking.

[0092] Example 6: In a further embodiment of this solution, in order to further improve the braking performance of the hoisting equipment, the base 1 is further provided with a brake mechanism 35 for assisting the motor 3 in braking. Figure 17 , Attachment Figure 18 , Attachment Figure 19 As shown, the brake mechanism 35 includes a stand mounted on the base 1, with a pressure rod 24 rotatably mounted on its upper end. A second telescopic rod 23 rotatably mounted on the base 1. The extended end of the second telescopic rod 23 rotatably connects to the end of the pressure rod 24, so that the pressure rod 24 is driven to reciprocate and deflect by the extension and contraction of the second telescopic rod 23. A rocker 25 rotatably mounts to the middle of the pressure rod 24, with a truss 26 disposed at the end of the rocker 25. A V-shaped frame 27 is inserted into the truss 26. A brake 1 28 is rotatably connected to the bend of the V-shaped frame 27. A connecting rod 41 is rotatably connected to the other end of the V-shaped frame 27. A second brake 29 is rotatably connected to the other end of the connecting rod 41. Both brakes 1 28 and 29 are rotatably mounted on the bracket 17 and are symmetrically arranged along the output axis of the motor 3. Brake shoes 30 are provided on both brakes 1 28 and 29.

[0093] According to the above technical solution:

[0094] When the telescopic rod 23 is retracted, the end of the pressure rod 24 sinks and deflects, thereby pulling the lower end of the rocker 25 down. The rocker 25 pulls the brake 1 28 through the truss 26 and the V-shaped frame 27 to deflect toward the output shaft of the motor 3. The descent of the rocker 25 will cause the connecting end of the V-shaped frame 27 and the truss 26 to sink and the other end to tilt upward. The tilted end of the V-shaped frame 27 will pull the connecting rod 41 and drive the brake 2 29 to deflect toward the output shaft of the motor 3, so that the two brake shoes 30 are buckled on the output shaft of the motor 3, adding a clamping braking form and assisting the motor 3 in braking and locking.

[0095] The brake mechanism 35 can also protect the output shaft of the motor 3. When braking, the output shaft of the motor 3 is subjected to reverse torque and deformed or even cracked.

[0096] In this embodiment, a brake disc 31 is fixed to the output shaft of the motor 3, and the first brake 28 and the second brake 29 are symmetrically arranged on both sides of the brake disc 31. The brake disc 31 expands the space, increases the friction contact surface of the brake shoe 30, and improves the braking performance.

[0097] In this embodiment, the motor 3 is a double-shaft head motor 3, so that the brake disc 31 is arranged at the rear, which does not affect the connection between the output shaft of the motor 3 and the transmission box 4, and also expands the peripheral space for easy disassembly and assembly.

[0098] In a further embodiment of the present solution, there is provided a specific sequencing mechanism for helically winding the auxiliary steel strand 9 on the traction sheave 8:

[0099] With reference to the accompanying drawings, in which Figure 1 , the accompanying drawings, in which Figure 3 , the accompanying drawings, in which Figure 6 , the accompanying drawings, in which Figure 8 The sequencing mechanism comprises a support standing on both sides of the frame 2, and a reciprocating screw 10 is rotatably mounted on the two supports. The reciprocating screw 10 is provided with a double helical thread, so that unidirectional rotation can drive the workpiece to move back and forth along the axial direction. The reciprocating screw 10 is arranged axially parallel to the traction sheave 8. The reciprocating screw 10 is threadedly mounted with a wire arranging ring 11. The wire arranging ring 11 is provided with a mounting hole. A limiting shaft is inserted into the mounting hole. The two ends of the limiting shaft are fixed on the two supports, respectively. Through the cooperation of the limiting shaft and the mounting hole, the wire arranging ring 11 slides horizontally relative to the traction sheave 8.

[0100] According to the above technical solution, in use, the reciprocating screw 10 is driven to rotate, thereby driving the wire arranging ring 11 to move back and forth along the axial direction of the reciprocating screw 10, thereby guiding the steel strand 9 to sequentially and helically wind along the surface of the traction sheave 8, and to reciprocally stack layer by layer.

[0101] In order to avoid the suspension end of the steel strand 9 moving along the axial direction of the traction sheave 8 due to the change of the winding and unwinding state, causing the lifting member to shift and deviate, the present embodiment further fixes an arch bridge on the base 1 on the side away from the traction sheave 8 of the reciprocating screw 10. The center of the arch bridge is fixed with a wire guide ring 12. After the steel strand 9 passes through the wire arranging ring 11, it passes through the wire guide ring 12. Since the position of the wire guide ring 12 does not change, the position of the suspension end of the steel strand 9 will not change, thereby reducing the influence of the winding of the steel strand 9 on the lifting state.

[0102] The base 1 is provided with a mounting seat 14 on the side away from the wire arranging ring 11 of the wire guide ring 12. Two wire guide wheels 13 are vertically and symmetrically rotatably mounted on the mounting seat 14. The outer edge surface of each wire guide wheel 13 is provided with a ring groove. The suspension end of the steel strand 9 sequentially passes through the wire arranging ring 11, the wire guide ring 12, and the ring grooves of the wire guide wheels. The steel strand 9 is sequentially wound and unwound by the wire arranging ring 11, and the suspension end output position is fixed by the wire guide ring 12. The steel strand 9 is clamped by the two wire guide wheels, and the two wire guide wheels and the mounting seat 14 support the load, so that the steel strand 9 is flat at the positions passing through the wire arranging ring 11 and the wire guide ring, so as to prevent the wire arranging ring 11 and the wire guide ring from being damaged by stress.

[0103] In the present embodiment, the reciprocating screw 10 is connected with the rotating shaft 5 through chain transmission, so that the reciprocating screw 10 rotates synchronously with the rotating shaft 5. Only the exposed part of the rotating shaft 5 and the reciprocating screw 10 is shown in the drawings, and the chain transmission structure is not shown. A separate motor 3 can also be provided for the reciprocating screw 10.

[0104] Example 8, in a further embodiment of this solution, refer to the attached Figure 23 As shown, the outer edges of the hubs on both sides of the traction sheave 8 are bent toward each other to form hooks, and a locking piece is provided at the end of the locking rod 21. Thus, after the locking rod 21 is engaged in the locking groove 19, even if the locking rod 21 deflects and moves sideways, the locking piece is locked in the hook of the hub, preventing the locking rod 21 from disengaging from the locking groove 19, thereby ensuring the braking effect.

[0105] Example 9, in a further embodiment of this solution, in order to further improve the stability of the hoisting process and reduce the risk of shaking, refer to the attached Figure 22 As shown, multiple sets of electric hoists are installed around the lower end of the base 1, and the output ends of the electric hoists are hooked around the periphery of the hanging frame 36. As shown in the figure, the hanging frame 36 is a quadrangular pyramid, and electric hoists are connected to the four corners. During lifting, the electric hoists reel in and unreel in sync with the winding and unwinding of the steel strand 9, ensuring that the hook wire of the electric hoist always remains straight, thereby pulling and guiding the hanging frame 36, reducing the probability of the hanging frame 36 shaking, and then improving the stability of the lifting to a certain extent. Even through the pulling of the electric hoist, the lifting slope of the steel box girder can be adjusted.

[0106] In this solution, a speed sensor is installed on the base 1, corresponding to the output shaft of the motor 3, to detect the output status of the motor 3. The speed sensor and the control box driving the motor 3 are electrically connected to the telescopic rod 1 32 and the telescopic rod 2 23. When the motor 3 is turned off and the output shaft stops rotating, the telescopic rods 1 32 and 23 receive a signal to brake. Before lifting or hoisting is required, the telescopic rods 1 32 and 23 reset, disabling the brakes before the motor 3 rotates. Only after the brakes are disengaged does the motor 3 start to perform lifting or hoisting, thus avoiding motion interference.

[0107] In this solution, the telescopic rod 1 32 and the telescopic rod 23 are any one of an electric telescopic rod, a hydraulic rod 24 and a pneumatic rod.

[0108] In this solution, the elastic member 1 22 , the elastic member 2 38 , and the elastic member 3 are all springs.

[0109] Example 10: This embodiment provides a method for hoisting a steel box girder, comprising:

[0110] S1: The lower spreader is pre-installed.

[0111] The traction wheel 8 is driven to pay out the line, so that the hanging frame 36 gradually descends to a suitable position, so that the hook on the hanging frame 36 can be locked on the steel box girder bridge plate.

[0112] S2: Reel in and lift the steel box girder.

[0113] The traction wheel 8 slowly reels the steel strand 9, causing the hanging frame 36 to rise slowly, so that the hook line is slowly tightened to prevent the hook from being unhooked, and also ensure the stability of the initial state of the lifting to avoid shaking just after the lifting.

[0114] S3: Shift adjustment of steel box girder.

[0115] After the steel box girder rises to a certain height, the motor 3 is turned off, and the first level of self-locking braking is achieved by relying on the worm gear mechanism 33.

[0116] At the same time, telescopic rod 132 activates and contracts, pulling the end of drive rod 18 away from dynamic friction disc 16 and sinking it downward. The end of drive rod 18 abutting dynamic friction disc 16 tilts upward, pushing against dynamic friction disc 16 toward static friction disc 15 until they are firmly engaged. The compressive friction between dynamic friction disc 16 and static friction disc 15 achieves traditional second-stage friction braking. As drive rod 18 deflects, the pull cord 20 pulls on locking rod 21, causing it to gradually contact the hub of traction sheave 8 and engage with slot 19. The mechanical interlocking of locking rod 21 with slot 19 ensures the rigid locking of traction sheave 8.

[0117] At the same time, the telescopic rod 23 starts to shrink, driving the end of the pressure rod 24 to sink and deflect, thereby pulling the lower end of the rocker 25 down. The rocker 25 pulls the brake 1 28 through the truss 26 and the V-shaped frame 27 to deflect it toward the output shaft of the motor 3. The descent of the rocker 25 will cause the connecting end of the V-shaped frame 27 and the truss 26 to sink and the other end to tilt upward. The tilted end of the V-shaped frame 27 will pull the connecting rod 41 and drive the brake 2 29 to deflect toward the output shaft of the motor 3, so that the two brake shoes 30 are buckled on the output shaft of the motor 3, forming a third-level clamping brake, which assists the motor 3 in braking and locking.

[0118] Three-level braking, two sets of friction brakes and one set of mechanical locking brakes, to ensure the position stability of the steel box girder during the lifting and translation process.

[0119] After the traction sheave 8 is locked, the steel box girder is transferred along with the traveling vehicle.

[0120] S4: Assemble steel box girder.

[0121] After moving to the bridge assembly position, telescopic rods 1 32 and 23 are extended, causing the drive rod 18 and pressure rod 24 to reset, separating the dynamic friction disc 16 from the static friction disc 15, the lock rod 21 from the retaining groove 19, and the brake shoe 30 from the brake disc 31. The traction sheave 8 is now freed from its restraint. At this point, the motor 3 can drive the traction sheave 8 to rotate and pay out the line, thereby starting to lower the beam.

[0122] During the beam lowering process, the state of the steel box beam is adjusted by the electric hoist to make the bridge docking smooth and fit.

[0123] S5: The device returns to the steel box girder parking position, repeats steps S1-4, and repeats the hoisting and splicing to complete the bridge splicing.

[0124] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

[0125] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0126] Although the embodiments of the present application have been shown and described above, it can be understood that the above-described embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A steel box girder bridge plate hoisting structure, characterized in that: The invention comprises a base (1), a traction wheel (8) is rotatably mounted on the base (1), and the traction wheel (8) is driven by a driving structure to rotate forward and reverse and brake; a steel strand (9) is wound around the traction wheel (8), and the steel strand (9) is driven by a sorting mechanism to be spirally wound back and forth on the traction wheel (8) in sequence, and a hanging frame (36) is fixed to the hanging end of the steel strand (9), and a plurality of hooks for hanging the steel box girder bridge plate are provided around the hanging frame (36); Static friction discs (15) are fixed on opposite sides of the hubs on both sides of the traction wheel (8), brackets (17) are fixed on opposite sides of the two static friction discs (15) on the base (1), dynamic friction discs (16) are slidably mounted on the brackets (17) along the axial direction of the traction wheel (8), and driving rods (18) are abutted on opposite sides of the two dynamic friction discs (16), and the driving rods (18) are rotatably mounted on the brackets (17). The driving rods (18) are driven by the telescopic rod (32) to deflect; The hubs on both sides of the traction wheel (8) are provided with a plurality of slots (19) in an annular array. A locking rod (21) corresponding to the slots (19) is rotatably mounted on the side of the hub of the traction wheel (8) on the base (1). The locking rod (21) always tends to move away from the slots (19) under the action of an elastic member (22). A pull rope (20) is provided at the end of the locking rod (21). The other end of the pull rope (20) is connected to the driving rod (18) against one end of the dynamic friction disc (16); The locking rod (21) is movably arranged, and the locking rod (21) is suspended and installed on the side of the hub of the traction wheel (8) through an elastic member (22). A through groove for the lower end of the locking rod (21) to pass through is provided on the base (1), and a limit member is provided at the lower end of the locking rod (21); A steel cable (37) is provided at the lower end of the locking rod (21), the steel cable (37) passes through the slot, and a limiting member is provided at the lower end of the steel cable (37); The driving structure comprises a motor (3) and a transmission box (4) fixed on a base (1); a gear reduction mechanism (34) is provided in the transmission box (4); and a worm gear mechanism (33) is provided in the transmission box (4) between the gear reduction mechanism (34) and an output shaft of the motor (3); The base (1) is also provided with a brake mechanism (35) for assisting the motor (3) in braking. The brake mechanism (35) includes a stand mounted on the base (1). A pressure rod (24) is rotatably mounted on the upper end of the stand. The pressure rod (24) is driven to deflect back and forth by a telescopic rod (23) rotatably mounted on the base (1). A rocker (25) is rotatably mounted on the middle of the pressure rod (24). A truss rod (26) is provided at the end of the rocker rod (25). The truss rod (26) A V-shaped frame (27) is inserted on the upper portion, a brake 1 (28) is rotatably connected to the bending portion of the V-shaped frame (27), the other end of the V-shaped frame (27) is rotatably connected to a connecting rod (41), the other end of the connecting rod (41) is rotatably connected to a brake 2 (29), the brake 1 (28) and the brake 2 (29) are both rotatably mounted on the bracket (17), and are symmetrically arranged along the output axis of the motor (3), and brake shoes (30) are provided on the brake 1 (28) and the brake 2 (29); A brake disc (31) is fixed on the output shaft of the motor (3), and a first brake (28) and a second brake (29) are symmetrically arranged along both sides of the brake disc (31); The outer edge surfaces of the hubs on both sides of the traction sheave (8) are bent in opposite directions; A plurality of electric hoists are provided around the lower end of the base (1), and the output ends of the electric hoists are respectively hooked to the hanging frames (36).

2. The steel box girder bridge plate hoisting structure according to claim 1, characterized in that: The sorting mechanism includes a reciprocating screw (10) rotatably mounted on the side of the traction wheel (8), the reciprocating screw (10) and the traction wheel (8) are axially arranged parallel to each other, a wire arrangement ring (11) is threadedly mounted on the reciprocating screw (10) and slides horizontally relative to the base (1), a wire ring (12) is fixed on the base (1) on the side of the reciprocating screw (10) away from the traction wheel (8), and two wire wheels (13) are vertically symmetrically mounted on the side of the wire ring (12) away from the wire arrangement ring (11), and an annular groove is provided on the outer edge surface of the two wire wheels (13), and the hanging end of the steel strand (9) passes through the annular grooves of the wire arrangement ring (11), the wire ring (12), and the wire wheel (13) in sequence.

3. A method for hoisting steel box girder bridge plates, characterized in that: include: S1: The lower hoist is pre-installed: the traction wheel (8) is driven to release the line, so that the hanging frame (36) gradually descends to a suitable position so that the hook on the hanging frame (36) can be locked on the steel box girder bridge plate; S2: Reeling and lifting the steel box girder: The traction wheel (8) slowly reels the steel strand (9), causing the hoisting frame (36) to slowly rise, so that the steel strand (9) is slowly tightened, thereby preventing the hook from being unhooked and ensuring the stability of the initial lifting state to avoid shaking immediately after lifting; S3: Shift adjustment of the steel box girder: After the steel box girder rises to a certain height, the motor (3) is turned off, and the worm gear mechanism (33) is used to achieve the first-level self-locking brake; At the same time, the telescopic rod (32) is activated and retracted, thereby pulling the driving rod (18) away from one end of the dynamic friction disc (16) and sinking, and the driving rod (18) will be tilted upward when it abuts against one end of the dynamic friction disc (16), thereby abutting against the dynamic friction disc (16) and moving toward the static friction disc (15) until the two are tightly fitted; through the squeezing friction between the dynamic friction disc (16) and the static friction disc (15), the traditional second-level brake friction braking is achieved; and while the driving rod (18) is deflected, the locking rod (21) is pulled and deflected by pulling the pull rope (20), so that the locking rod (21) gradually contacts the hub of the traction wheel (8) and is embedded in the card slot (19), and the rigid locking of the traction wheel (8) is achieved through the mechanical locking of the locking rod (21) and the card slot (19); At the same time, the telescopic rod 2 (23) starts and contracts, driving the end of the pressure rod (24) to sink and deflect, thereby pulling the lower end of the rocker (25) down, and the rocker (25) pulls the brake 1 (28) through the truss (26) and the V-frame (27) to deflect toward the output shaft of the motor (3); and the rocker (25) descends, causing the connecting end of the V-frame (27) and the truss (26) to sink and the other end to tilt upward in the opposite direction, and the tilted end of the V-frame (27) will pull the connecting rod (41) and drive the brake 2 (29) to deflect toward the output shaft of the motor (3), so that the two brake shoes (30) are buckled on the output shaft of the motor (3), forming a third-level clamping brake, and assisting the motor (3) to perform brake locking; after the traction wheel (8) is locked, the steel box girder is transferred along with the traveling vehicle; S4: Assembling the steel box girder: After being transferred to the bridge assembly position, the telescopic rod 1 (32) and the telescopic rod 2 (23) are extended, thereby resetting the driving rod (18) and the pressure rod (24), so that the dynamic friction disc (16) and the static friction disc (15), the locking rod (21) and the slot (19), and the brake shoe (30) and the brake disc (31) are all separated, and the traction wheel (8) loses its limit; at this time, the motor (3) can drive the traction wheel (8) to rotate and release the line, thereby starting to release the beam; during the process of releasing the beam, the state of the steel box girder is adjusted by the electric hoist so that the bridge docking is smooth and fit; S5: The equipment returns to the parking position of the steel box girder and repeats steps S1-4, repeating the lifting and splicing to complete the bridge splicing.

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