CN118125311A - Use method of mobile crane based on suspension bridge main cable - Google Patents

Abstract

The invention relates to the field of mobile cranes, and discloses a use method of a mobile crane based on a main cable of a suspension bridge, which comprises the following steps: step one, preparing a mobile crane, wherein a traction winch drives the mobile crane to move to a feeding position on a main cable through a traction steel cable, the inclination angle of a travelling mechanism changes along with the main cable, and a truss frame is kept horizontal; step three, a lifting winch downwards releases a lifting steel rope, the lower end of the lifting steel rope is connected with a heavy object, and the lifting winch upwards withdraws the lifting steel rope; and step four, a traction winch drives the movable crane to move to a discharging position, the hoisting winch downwards releases a hoisting steel rope, and a weight at the lower end of the hoisting steel rope is taken down. So as to ensure the hoisting efficiency and safety and the traveling speed of the mobile crane.

Description

Use method of mobile crane based on suspension bridge main cable

Technical Field

The invention relates to the field of mobile cranes, in particular to a use method of a mobile crane based on a main cable of a suspension bridge.

Background

In the construction of a suspension bridge, two main cables are usually required to be constructed firstly, the main cables are used as upper main bearing members, then a movable crane is arranged on the two main cables, two sides of the movable crane respectively move on the main cables through a travelling mechanism, and a traction device provides moving power for the travelling mechanism, so that the main cables are used as main bearing members, and weights such as members, materials and the like are transported to a set position through the movable crane, so that the construction and the transportation are facilitated.

The main cable of the suspension bridge is used as a main bearing structure of the mobile crane, although the terrain obstacle can be overcome, the construction period is short, but because the main cable is parabolic, the influence of wind load is larger, and the stability is poor, therefore, the mobile crane faces the problems of insufficient walking stability, poor radian change capability of the adaptive main cable, high operation complexity during windy and the like, ideal hoisting efficiency and safety cannot be realized, the speed of the mobile crane needs to be reduced during movement, so that the influence caused by the problems is reduced, and the walking speed of the mobile crane is also reduced.

Disclosure of Invention

The invention aims to provide a use method of a mobile crane based on a main cable of a suspension bridge, which can ensure the hoisting efficiency and safety and ensure the travelling speed of the mobile crane.

In order to achieve the above purpose, the invention adopts the following technical scheme: the use method of the mobile crane based on the main cable of the suspension bridge comprises the following steps:

Step one, preparing a mobile crane, wherein the mobile crane comprises a lifting mechanism, a traction mechanism, two main cables, two rails and two travelling mechanisms, the rails are made of rigid materials, the lower ends of the two travelling mechanisms are hinged with two travelling roller assemblies, each travelling roller assembly comprises an assembly shell and at least two travelling rollers, each travelling roller is a cylinder with an annular section which is horizontally arranged, a rotating shaft is arranged on the inner side of the assembly shell, passes through each travelling roller and is in sliding and rotating connection with each travelling roller, and a gap is reserved between each travelling roller and each assembly shell; limiting parts are arranged at two ends of the walking roller, the limiting parts radially protrude relative to the cross section of the walking roller, and the width of the track is smaller than the interval between the two limiting parts;

The track is a box-shaped section, and an upper flange and a lower flange are respectively arranged on the upper side and the lower side of the box-shaped section; the track adopts a sectional design, a plurality of sections of tracks are arranged on the main cable in a head-to-tail hinged manner, and the tracks are connected with the main cable through connecting pieces; the track is arranged in a segmented mode and is respectively paved on the two main cables, the two travelling mechanisms are respectively arranged on the two tracks in a sliding mode, and two sides of the lifting mechanism are respectively hinged with the two travelling mechanisms;

The hoisting mechanism comprises a horizontal truss frame, a hoisting winch is arranged in the truss frame, a hoisting cable is connected to the hoisting winch, and the lower end of the hoisting cable can be connected with a heavy object;

the traction mechanism comprises a traction winch and a traction steel rope, the traction winch is arranged at the fixed end of the main rope, and the traction steel rope is connected with the traction winch and the travelling mechanism;

Step two, a traction winch drives a movable crane to move to a feeding position on a main cable through a traction steel cable, the inclination angle of a travelling mechanism changes along with the main cable, and a truss frame is kept horizontal;

when the main cable generates transverse deformation due to wind load, the walking rollers slide relative to the rotating shaft respectively, so that the transverse deformation of the main cable is adapted;

when the main cable longitudinally deforms due to wind load, the ends of the sections of the rails relatively rotate, so that the longitudinal deformation of the main cable is adapted;

step three, a lifting winch downwards releases a lifting steel rope, the lower end of the lifting steel rope is connected with a heavy object, and the lifting winch upwards withdraws the lifting steel rope;

and step four, a traction winch drives the movable crane to move to a discharging position, the hoisting winch downwards releases a hoisting steel rope, and a weight at the lower end of the hoisting steel rope is taken down.

The beneficial effect of this scheme is:

Under wind load effect, the main cable can produce vertically and make a round trip to drive track and running gear on the main cable and make a round trip to rock, and in this scheme, this kind of rocking releases at running gear and hoisting mechanism's articulated position, and specific running gear begins when rocking, hoisting mechanism can not take place synchronous rocking with running gear owing to self weight and the heavy object that lifts by crane thereof, thereby make running gear and hoisting mechanism take place relative rotation, and when hoisting mechanism begins to rock, running gear has rocked extreme position, begins reverse direction and rocks. Therefore, compared with the fixed connection of the travelling mechanism and the lifting mechanism, the lifting mechanism in the scheme has smaller shaking amplitude, does not need to lift again when waiting for wind stop, and improves the lifting efficiency; the lower end of the hoisting steel rope is directly connected with the heavy object, and the shaking of the hoisting steel rope can be reduced under the action of the dead weight of the heavy object, so that the shaking of a hoisting mechanism is reduced, and the construction safety is improved.

2. Under wind load effect, the main cable produces and rocks the deformation, in order to satisfy the support requirement, running gear adopts rigid material usually, simultaneously, and the main cable is parabolic generally, can't adapt to the deformation of main cable completely, therefore running gear can't remove fast on the main cable, card on the main cable even easily, and in this scheme, set up the track on the main cable, compare in the main cable, the track is more difficult for deformation, running gear removes on the track, receives the deformation influence of main cable less, and travel speed is faster, difficult card is on the main cable.

Further, the connecting piece comprises an opposite joint hoop and rail pressing devices, the opposite joint hoop is locked on the main cable, the opposite joint hoop is arranged at the end part of each section of track, a plurality of rail pressing devices are arranged on the upper side of the opposite joint hoop, the rail pressing devices comprise fixing pieces and elastic pieces which are mutually connected, the fixing pieces are connected with the upper surfaces of the opposite joint hoops, the fixing pieces transversely limit the lower flanges of the tracks, the fixing pieces comprise arched parts, the lower sides of the arched parts are provided with horizontal cylindrical grooves with sector sections, and clamping grooves are formed in the spaces between the cylindrical grooves and the upper sides of the opposite joint hoops; the elastic piece is a strip-shaped piece which is bent for many times, two ends of the elastic piece are respectively a straight rail pressing section and a fixed section which are horizontally arranged, a part, which is positioned between the rail pressing section and the fixed section, of the spring piece is a bending section, the fixed section is clamped into the clamping groove, friction force is generated between the fixed section and the clamping groove, when the external force is larger than the friction force, the fixed section can slide relative to the clamping groove, the rail pressing section is pressed on the lower flange of the rail, and the rail pressing section is pressed on the lower flange of the rail by utilizing the elasticity of the bending section; the bending section is locally pressed on the fixing piece by self elasticity to provide reaction force for the rail pressing section to press the rail,

In the second step, when the main cable is deformed longitudinally due to wind load, the rail slides longitudinally relative to the main cable, so that stress generated between the rail and the main cable is released.

Further, a bottom plate is arranged at the bottom of the assembly shell, two sides of the bottom plate are vertically provided with anti-falling lug plates respectively, two anti-falling protrusions are arranged on the inner sides of the anti-falling lug plates, the distance between the two anti-falling protrusions is between the width of the upper flange of the rail and the width of the body of the rail, and the distance between the two anti-falling lug plates is larger than the width of the upper flange of the rail;

In the second step, when the main cable is longitudinally deformed due to wind load, the ends of the sections of the tracks rotate relatively, and the traveling roller mechanisms are limited on the tracks by the anti-falling lug plates when passing through the positions between the tracks at the two ends, so that the traveling roller mechanisms are prevented from being partially loosened and derailed.

Further, a temporary hoop is arranged on the lower side of the travelling mechanism and comprises a fixed plate, the fixed plate is connected with the lower side of the travelling mechanism, two sides of the fixed plate are respectively provided with a hoop plate, the upper part of the hoop plate is a vertical part, the vertical upper end of the hoop plate is hinged with the fixed plate, the lower part of the hoop plate is an arc part, and the lower end of the arc part is provided with a counterweight part;

the fifth step is that when the mobile crane is required to stop moving temporarily, the lower ends of the arc-shaped parts of the two hoop plates of the temporary hoop are connected through bolts, so that the temporary hoop locks the main cable;

When the movable crane is required to resume movement, the bolts of the arc-shaped parts of the two hoop plates of the temporary hoop are taken down, the hoop plates loosen the main cable, the hoop plates rotate around the fixed plate under the action of dead weight, and a clearance gap is formed between the hoop plates and the main cable; the traction winch drives the movable crane to move, and the involution anchor ear can pass through the clearance.

Furthermore, the lower end of the travelling mechanism is also provided with an adjusting jack, the adjusting jacks are arranged between the two travelling roller assemblies, and the lower end of an output shaft of each adjusting jack can be propped against the track;

And fifthly, when the mobile crane is required to temporarily stop moving, after the temporary anchor ear locks the main cable, driving the lower end of the output shaft of the adjusting jack to extend to be in contact with the track, taking down the bolts of the arc-shaped parts of the two anchor ear plates of the temporary anchor ear, and continuously driving the adjusting jack to enable the lower surface of the walking roller to be out of contact with the track so as to replace the walking roller.

The scheme has the following effects:

1. In the prior art, the main cable is approximately parabolic, the track is adapted to the shape of the main cable, the track is also approximately parabolic as a whole, and because the positions of the different walking roller assemblies are different, the radian of the main cable at different positions is different, if the walking mechanism and the walking roller assemblies are rigidly connected, the walking roller assemblies cannot be well adapted to the shape of the main cable, and the possibility of partial position void exists, so that the construction safety is reduced; in this scheme, running gear and walking roller subassembly are articulated, and walking roller subassembly can be rotatory for running gear to according to the shape automatic adaptation angle of main cable, laminate more with the main cable, make walking roller subassembly be difficult to block, guaranteed the construction safety.

2. The walking roller component limits the transverse movement of the walking roller component through the limiting part, so that the walking roller component is ensured not to be transversely derailed. When the strong wind is scraped, the main cable can produce transverse deformation, and the rolling of walking gyro wheel is hindered easily, and in this scheme, leave the clearance between walking gyro wheel and the subassembly casing, allow the walking gyro wheel to be can for subassembly casing lateral shifting to can adapt to the deformation that the main cable produced to a certain extent, and then make the rolling of walking gyro wheel more smooth and easy. When the deviation between the center line of the walking roller and the track is large, an eccentric force is easily generated between the walking roller and the track, and the walking roller is easily inclined to one side of the track so as to cause derailment; in this scheme, through bottom plate, anticreep otic placode and anticreep arch spacing to orbital top flange, and then can avoid walking gyro wheel to take place because the slope derailment.

3. According to the scheme, the high-strength bolts are used for tightly fastening the opposite-joint anchor ear, so that the opposite-joint anchor ear is fastened on the main cable, the rail is fixed on the opposite-joint anchor ear through the rail pressing device, the rail pressing device allows the rail to longitudinally move relative to the opposite-joint anchor ear and allows the rail to vertically move against the elasticity of the elastic piece; because the main cable is of a flexible structure and is parabolic, when the track is stressed, the elastic rail pressing device can be properly deformed, so that the track and the involution anchor ear are prevented from being damaged.

4. The temporary anchor ear can lock the main rope when work needs or equipment trouble, effectively prevent the loop wheel machine because of the potential safety hazard that unexpected removal caused, ensure the safety and stability of maintenance operation process, during normal movement, take down the bolt of temporary anchor ear can, can not influence running gear's moving, after the bolt of the arc portion of two hoop boards is taken down, the hoop board loosens the main rope, because the focus position of hoop board is through counter weight portion adjustment, the hoop board forms between hoop board and the main rope and keeps away the empty space around the fixed plate rotatory back under the dead weight effect, the walking gyro wheel subassembly drives running gear and removes, the connecting piece can pass and keeps away the empty space, thereby avoid connecting piece and hoop board to bump. At this time, if wind load is increased, the main cable is transversely deformed, but the distance is far, so that naked eyes of people can not be observed; at the moment, the friction force between the travelling mechanism and the main cable is increased, the travelling roller horizontally slides on the rotating shaft to adapt to the deformation of the main cable, but the horizontal sliding can lead to the reduction of the interval between the hoop plate at one side and the main cable, so that the clearance is reduced, and the involution anchor ear on the main cable cannot pass through the clearance, thereby preventing the travelling mechanism from advancing, further leading an operator to realize that the wind load is overlarge and needing to stop the operation in time;

5. Compared with the scheme without the track, the scheme optimizes the moving surface (the contact surface of the running mechanism and the track) of the running mechanism, so that the moving surface of the running mechanism is flatter and more durable, and as each section of track is straight, the moving track of the running mechanism is less influenced by the deformation of the main cable, and the moving speed of the running mechanism can be accelerated;

Because the main cable is parabolic, the slopes of two adjacent sections of tracks are different, and when the travelling mechanism passes between the two sections of tracks, the travelling mechanism is easy to vibrate due to abrupt change of the slopes; in the scheme, the normal direction of the contact surface of the walking roller mechanism and the rail is the supporting force direction of the rail to the walking roller mechanism; the running roller mechanism at the front end of the running mechanism is preferentially contacted with the next section of track and rotates along with the slope of the next section of track relative to the running mechanism, at the moment, the supporting force direction of the running mechanism at the front end is inclined towards one side close to the last section of track, the supporting force is decomposed into a deceleration component force and a steering component force, the deceleration component force is parallel to the last section of track, the running mechanism can be decelerated, the steering component force is perpendicular to the deceleration component force, and the advancing direction of the running mechanism can be changed; compared with the fixed connection of the running mechanism and the running roller mechanism, the running mechanism and the running roller mechanism are hinged in the scheme, and the running roller mechanism can rotate relative to the running mechanism, so that the supporting force direction inclination angle of the running roller mechanism at the front end is larger, more supporting force is decomposed into a deceleration component force, the deceleration effect of the running mechanism is enhanced, and the running mechanism can pass through the position between two sections of tracks more stably.

Because the main cable is parabolic, the curvature constantly changes, therefore the difference of the slope of two adjacent sections of orbits is also different, the closer to the fixed end of the main cable, the greater the difference of the slope of two adjacent sections of orbits is, the greater the vibration degree that occurs when the travelling mechanism passes between two sections of orbits is, and in the scheme, the greater the angle that the direction of the supporting force of the travelling roller mechanism at the front end of the travelling mechanism changes is when the travelling mechanism passes through the track section position is, the greater the decomposition of more supporting force is a deceleration component, the deceleration effect of the travelling mechanism is more obvious, and therefore the deceleration effect can change along with the position where the travelling mechanism is located.

Drawings

FIG. 1 is a flow chart of an embodiment;

FIG. 2 is a schematic illustration of a main cable of an embodiment of a suspension bridge;

FIG. 3 is an overall three-dimensional isometric view of an embodiment;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is an enlarged view of FIG. 4 at C;

FIG. 6 is a left side view of the travel mechanism and main cable of the embodiment;

FIG. 7 is a cross-sectional front view of the travel mechanism and main cable of an embodiment;

FIG. 8 is an enlarged view of FIG. 7 at D;

FIG. 9 is a cross-sectional view of a track of an embodiment;

FIG. 10 is an enlarged view of FIG. 3B;

FIG. 11 is a three-dimensional isometric view of a running roller assembly of an embodiment;

FIG. 12 is a top view of a walking roller assembly of an embodiment;

FIG. 13 is a schematic view of an adjustment of an embodiment of a running gear as it moves;

Fig. 14 is a schematic view of a traction mechanism of an embodiment.

Reference numerals in the drawings of the specification include: the hoisting mechanism 1, the truss frame 11, the hoisting winch 12, the hoisting cable 13, the running mechanism 2, the temporary fixing hole 21, the temporary anchor 22, the fixing plate 221, the vertical portion 222, the arc portion 223, the counterweight portion 224, the adjusting jack 23, the running roller assembly 3, the assembly housing 31, the running roller 32, the stopper portion 33, the rotation shaft 34, the bottom plate 35, the anti-drop lug plate 36, the anti-drop protrusion 37, the track 4, the upper flange 41, the lower flange 42, the convex portion 43, the concave portion 44, the connecting pin 45, the traction cable 51, the traction pulley 52, the traction winch 53, the main cable 6, the involution anchor 61, the fixing piece 62, the arc portion 621, the elastic piece 63, the rail pressing section 631, the bending section 632, the fixing section 633, the cable clip 7, the cable tower 8, and the pier 9.

Detailed Description

The following is a further detailed description of the embodiments:

Examples

The use method of the mobile crane based on the main cable of the suspension bridge comprises the following steps:

Step one, preparing a mobile crane, wherein the mobile crane comprises a hoisting mechanism 1, a traction mechanism, two main cables 6, two rails 4 and two travelling mechanisms 2, as shown in fig. 2, the main cables 6 are main bearing structures on a suspension bridge, the suspension bridge comprises two cable towers 8, a plurality of pier columns 9 are arranged between the cable towers 8, the main cables 6 are arranged above the pier columns 9, and two ends of the main cables 6 are respectively fixed at the upper ends of the cable towers 8;

The installation of the mobile crane comprises the following steps:

1.1, arranging a plurality of connecting pieces on two main cables 6 at equal intervals, respectively fixing two tracks 4 on the two main cables 6 through the connecting pieces, wherein each track 4 is made of rigid materials, and each track 4 adopts a sectional design, and a plurality of sections of tracks 4 are arranged on the main cables 6 in a head-to-tail hinged manner; as shown in fig. 4 and 6, the main cable 6 is provided with a cable clip 7, the cable clip 7 is used for connecting slings in the prior art, and the cable crane is a structure for connecting a bridge and the main cable 6 in the prior art.

As shown in fig. 9, the track 4 is a box-shaped section, and an upper flange 41 and a lower flange 42 are respectively arranged on the upper side and the lower side of the box-shaped section; as shown in fig. 5, one end of the rail 4 is provided with a convex part 43, the other end of the rail 4 is provided with a concave part 44, the shapes of the convex part 43 and the concave part 44 are matched with each other, the convex part 43 and the concave part 44 are provided with elongated pin holes, and a connecting pin 45 is arranged in each pin hole; in the position where the two rails 4 are hinged, the convex portion 43 of one rail 4 is inserted into the concave portion 44 of the other rail 4, and as shown in fig. 8, the connecting pin 45 passes through the pin holes of the convex portion 43 and the concave portion 44 at the same time and is rotatably connected with the two pin holes.

The connecting piece comprises an opposite joint hoop 61 and a rail pressing device, the opposite joint hoop 61 is held on the main cable 6, as shown in fig. 6 and 7, the lower end of the opposite joint hoop 61 is provided with a bolt hole, the lower end of the opposite joint hoop 61 is screwed by a bolt, in the embodiment, the opposite joint hoop 61 is fixed on the main cable 6 by adopting high-strength bolt screwing; the involution anchor ear 61 is arranged at the end part of each section of track 4, and a plurality of rail presses are arranged on the upper side of the involution anchor ear 61; the upper surface of the apposition anchor ear 61 is higher than the upper surface of the cable clamp 7.

As shown in fig. 5 and 8, the rail pressing device comprises a fixing piece 62 and an elastic piece 63 which are connected with each other, the upper surfaces of the fixing piece 62 and the involution anchor ear 61 are welded, the fixing piece 62 comprises an arch part 621, a horizontal cylindrical groove with a fan-shaped section is formed on the lower side of the arch part 621, and a clamping groove is formed in the space between the cylindrical groove and the upper side of the involution anchor ear 61; the elastic member 63 is a strip-shaped member that is bent for multiple times, two ends of the elastic member 63 are respectively a straight rail pressing section 631 and a fixing section 633, and a portion of the spring member located between the rail pressing section 631 and the fixing section 633 is a bending section 632, in this embodiment, the bending section 632 is bent for four times; the fixed section 633 is clamped into the clamping groove, a friction force is arranged between the fixed section 633 and the clamping groove, and when the external force is larger than the friction force, the fixed section 633 can longitudinally slide relative to the clamping groove. In this embodiment, the longitudinal direction is the length direction of the track 4; the rail pressing section 631 presses the lower flange 42 of the track 4 by the elasticity of the bending portion, and the bending section 632 locally presses the fixing piece 62 by the elasticity of the bending portion, so as to provide a reaction force for the rail pressing section 631 to press the track 4.

1.2 The two travelling mechanisms are respectively arranged on the two rails in a sliding way. As shown in fig. 3 and 10, two walking roller assemblies 3 are hinged at the lower ends of two walking mechanisms 2, and in this embodiment, the hinging manners of two structures are as follows: the two structures are penetrated through by the hinge shaft at the same time and are connected with the two structures in a rotating way, and certain friction force is formed between the hinge shaft and the two structures, so that damping is formed, and the hinge shaft can rotate relative to the two structures only when the external force is larger than the friction force.

As shown in fig. 11, the running roller assembly 3 includes an assembly housing 31 and two running rollers 32, the assembly housing 31 is a strip-shaped housing, two rotating shafts 34 are connected to the inner side of the assembly housing 31 by bolts in the width direction, the centers of the two rotating shafts 34 are located on the longitudinal (length direction) central axis of the assembly housing 31, and the rotating shafts 34 pass through the running rollers 32 and are connected with the running rollers 32 in a sliding and rotating manner, as shown in fig. 12, a gap is left between the running rollers 32 and the assembly housing 31.

As shown in fig. 11 and 12, the running roller 32 is a cylinder with an annular section and is horizontally arranged, both ends of the running roller 32 are provided with limiting parts 33, the limiting parts 33 are annular discs, the limiting parts 33 radially protrude relative to the section of the running roller 32, namely, the outer diameter of the limiting parts 33 is larger than the outer diameter of the running roller 32, the width of the track 4 is smaller than the interval between the two limiting parts 33, and the running roller 32 can roll on the track 4.

As shown in fig. 11, the bottom of the assembly housing 31 is integrally formed with a bottom plate 35, two sides of the bottom plate 35 are respectively vertically welded with an anti-drop lug plate 36, two anti-drop protrusions 37 are welded on the inner side of each anti-drop lug plate 36, as shown in fig. 8, the distance between the two anti-drop protrusions 37 is between the width of the upper flange 41 of the track 4 and the width of the body of the track 4, and the distance between the two anti-drop lug plates 36 is larger than the width of the upper flange 41 of the track 4.

As shown in fig. 6, two temporary hoops 22 are arranged between the two walking roller assemblies 3, the temporary hoops 22 can lock the main cable 6, as shown in fig. 7, the temporary hoops 22 comprise a fixing plate 221, the fixing plate 221 is connected with a temporary fixing hole 21 on the lower side of the walking mechanism 2 through bolts, two sides of the fixing plate 221 are respectively hinged with a hoop plate, the lower ends of the two hoop plates can be connected through bolts, and the two hoop plates can be matched for locking the main cable 6; the upper part of the hoop plate is a vertical part 222, the vertical upper end of the hoop plate is hinged with the fixed plate 221, the lower part of the hoop plate is an arc-shaped part 223, the lower ends of the arc-shaped parts 223 are welded with a counterweight part 224, and the lower ends of the arc-shaped parts 223 of the two hoop plates can be connected through bolts, so that a main cable 6 can be locked across a track 4; in the initial state, when the arc-shaped parts 223 of the two hoop plates are not connected through bolts, the hoop plates loosen the main cable 6, the hoop plates rotate around the fixed plate 221 under the action of dead weight, a clearance gap (not shown in the figure) is formed between the hoop plates and the main cable 6, and when the running roller assembly 3 drives the running mechanism 2 to move, the cable clamp 7 and the involution hoop 61 can both pass through the clearance gap.

As shown in fig. 6, two adjusting jacks 23 are further arranged between the two temporary hoops 22, the upper sides of the adjusting jacks 23 are connected with the travelling mechanism 2 through bolts, and the lower ends of output shafts of the adjusting jacks 23 can be propped against the track 4.

1.3 Two travelling mechanisms 2 are respectively hinged at two sides of the lifting mechanism 1. As shown in fig. 3, the lifting mechanism 1 comprises a truss frame 11, wherein a lifting winch 12 is connected in the truss frame 11 through bolts, a lifting cable 13 is connected to the lifting winch 12, and the lower end of the lifting cable 13 can be connected with a heavy object to be transported;

1.4 mounting a traction mechanism. As shown in fig. 14, the traction mechanisms comprise traction steel ropes 51, traction pulleys 52 and traction winches 53, the traction winches 53 are connected to the top ends of the rope towers 8 of the suspension bridge in a bolt manner, namely, the fixed ends of the main ropes 6 are connected to the left ends of the travelling mechanisms 2 in a bolt manner, as shown in fig. 6, the travelling mechanisms 2 are schematically represented by rectangular frames, the traction steel ropes 51 pass through the traction pulleys 52, one ends of the traction steel ropes 51 are connected with the traction winches 53, the other ends of the traction steel ropes 51 are anchored to the top ends of the rope towers 8, and as the main ropes 6 are parabolic, two mobile cranes can be installed on one main rope 6 according to the situation, and the corresponding traction mechanisms are respectively arranged at the top ends of the two rope towers 8, so that the transportation range covers the whole length of the main ropes 6;

Step two, a traction winch 53 drives a movable crane to move to a feeding position on a main cable 6 through a traction steel cable 51, the inclination angle of a travelling mechanism 2 changes along with the main cable 6, and a truss frame 11 is kept horizontal;

when the main cable 6 is transversely deformed due to wind load, the walking rollers 32 slide relative to the rotating shafts 34 respectively, so that the transverse deformation of the main cable 6 is adapted;

When the main cable 6 is deformed longitudinally due to wind load, the rail 4 slides longitudinally relative to the butt joint hoop 61 on the main cable 6, so that stress generated between the rail 4 and the main cable 6 is released; the ends of the sections of the rails 4 rotate relatively so as to adapt to the longitudinal deformation of the main cable 6; at this time, when the running roller 32 mechanism passes through the position between the rails 4 at both ends, the anti-derailing plate 36 restricts the running roller 32 mechanism to the rails 4, preventing the running roller 32 mechanism from being partially derailed and derailed.

Step three, the hoisting winch 12 releases the hoisting steel rope downwards, the lower end of the hoisting steel rope is connected with the weight, and the hoisting winch 12 upwards retracts the hoisting steel rope;

step four, the traction winch 53 drives the movable crane to move to a discharging position, the hoisting winch 12 downwards releases the hoisting steel rope, and the weight at the lower end of the hoisting steel rope is taken down;

Fifthly, when the mobile crane is required to temporarily stop moving, the lower ends of the arc-shaped parts 223 of the two hoop plates of the temporary hoop 22 are connected through bolts, so that the temporary hoop 22 locks the main cable 6;

When the mobile crane is required to resume movement, the bolts of the arc-shaped parts 223 of the two hoop plates of the temporary hoop 22 are taken down, the hoop plates loosen the main cable 6, the hoop plates rotate around the fixed plate 221 under the action of dead weight, and a clearance gap is formed between the hoop plates and the main cable 6; the traction winch 53 drives the mobile crane to move, and the involution anchor ear 61 can pass through the clearance gap;

When the traveling roller 32 needs to be replaced, after the temporary anchor ear 22 locks the main cable 6, the lower end of an output shaft of the adjusting jack 23 is driven to extend to be in contact with the track 4, bolts of arc-shaped parts 223 of two hoop plates of the temporary anchor ear 22 are taken down, the adjusting jack 23 is continuously driven, the lower surface of the traveling roller 32 is separated from contact with the track 4, and the traveling roller 32 is replaced; when wind load is large, the output shaft of the jack is driven to abut against the track 4 while unscrewing the bolts of the arc-shaped parts 223 of the two hoop plates, and finally the lower surface of the walking roller 32 is separated from contact with the track 4, so that the walking roller 32 is replaced.

The foregoing is merely exemplary of the present application, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, and these should also be regarded as the protection scope of the present application, which does not affect the effect of the implementation of the present application and the practical applicability of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (5)

1. The application method of the mobile crane based on the main cable of the suspension bridge is characterized by comprising the following steps of:

Step one, preparing a mobile crane, wherein the mobile crane comprises a lifting mechanism, a traction mechanism, two main cables, two rails and two travelling mechanisms, the rails are made of rigid materials, the lower ends of the two travelling mechanisms are hinged with two travelling roller assemblies, each travelling roller assembly comprises an assembly shell and at least two travelling rollers, each travelling roller is a cylinder with an annular section which is horizontally arranged, a rotating shaft is arranged on the inner side of the assembly shell, passes through each travelling roller and is in sliding and rotating connection with each travelling roller, and a gap is reserved between each travelling roller and each assembly shell; limiting parts are arranged at two ends of the walking roller, the limiting parts radially protrude relative to the cross section of the walking roller, and the width of the track is smaller than the interval between the two limiting parts;

The track is a box-shaped section, and an upper flange and a lower flange are respectively arranged on the upper side and the lower side of the box-shaped section; the track adopts a sectional design, a plurality of sections of tracks are arranged on the main cable in a head-to-tail hinged manner, and the tracks are connected with the main cable through connecting pieces; the track is arranged in a segmented mode and is respectively paved on the two main cables, the two travelling mechanisms are respectively arranged on the two tracks in a sliding mode, and two sides of the lifting mechanism are respectively hinged with the two travelling mechanisms;

The hoisting mechanism comprises a horizontal truss frame, a hoisting winch is arranged in the truss frame, a hoisting cable is connected to the hoisting winch, and the lower end of the hoisting cable can be connected with a heavy object;

the traction mechanism comprises a traction winch and a traction steel rope, the traction winch is arranged at the fixed end of the main rope, and the traction steel rope is connected with the traction winch and the travelling mechanism;

Step two, a traction winch drives a movable crane to move to a feeding position on a main cable through a traction steel cable, the inclination angle of a travelling mechanism changes along with the main cable, and a truss frame is kept horizontal;

when the main cable generates transverse deformation due to wind load, the walking rollers slide relative to the rotating shaft respectively, so that the transverse deformation of the main cable is adapted;

when the main cable longitudinally deforms due to wind load, the ends of the sections of the rails relatively rotate, so that the longitudinal deformation of the main cable is adapted;

step three, a lifting winch downwards releases a lifting steel rope, the lower end of the lifting steel rope is connected with a heavy object, and the lifting winch upwards withdraws the lifting steel rope;

and step four, a traction winch drives the movable crane to move to a discharging position, the hoisting winch downwards releases a hoisting steel rope, and a weight at the lower end of the hoisting steel rope is taken down.

2. The method for using a mobile crane based on a main cable of a suspension bridge according to claim 1, wherein: the connecting piece comprises an opposite-closing hoop and rail pressing devices, the opposite-closing hoop is locked on the main cable, the opposite-closing hoop is arranged at the end part of each section of track, a plurality of rail pressing devices are arranged on the upper side of the opposite-closing hoop, each rail pressing device comprises a fixing piece and an elastic piece which are mutually connected, the fixing piece is connected with the upper surface of the opposite-closing hoop, the fixing piece transversely limits the lower flange of the track and comprises an arch part, a horizontal cylindrical groove with a fan-shaped section is arranged on the lower side of the arch part, and a clamping groove is formed in a space between the cylindrical groove and the upper side of the opposite-closing hoop; the elastic piece is a strip-shaped piece which is bent for many times, two ends of the elastic piece are respectively a straight rail pressing section and a fixed section which are horizontally arranged, a part, which is positioned between the rail pressing section and the fixed section, of the spring piece is a bending section, the fixed section is clamped into the clamping groove, friction force is generated between the fixed section and the clamping groove, when the external force is larger than the friction force, the fixed section can slide relative to the clamping groove, the rail pressing section is pressed on the lower flange of the rail, and the rail pressing section is pressed on the lower flange of the rail by utilizing the elasticity of the bending section; the bending section is locally pressed on the fixing piece by self elasticity to provide reaction force for the rail pressing section to press the rail,

In the second step, when the main cable is deformed longitudinally due to wind load, the rail slides longitudinally relative to the main cable, so that stress generated between the rail and the main cable is released.

3. The method for using a mobile crane based on a main cable of a suspension bridge according to claim 2, characterized in that: the bottom of the assembly shell is provided with a bottom plate, two sides of the bottom plate are vertically provided with anti-falling lug plates respectively, two anti-falling protrusions are arranged on the inner sides of the anti-falling lug plates, the distance between the two anti-falling protrusions is between the width of the upper flange of the rail and the width of the body of the rail, and the distance between the two anti-falling lug plates is larger than the width of the upper flange of the rail;

In the second step, when the main cable is longitudinally deformed due to wind load, the ends of the sections of the tracks rotate relatively, and the traveling roller mechanisms are limited on the tracks by the anti-falling lug plates when passing through the positions between the tracks at the two ends, so that the traveling roller mechanisms are prevented from being partially loosened and derailed.

4. A method of using a mobile crane based on a suspension bridge main cable according to claim 3, characterized in that: the lower side of the travelling mechanism is provided with a temporary hoop, the temporary hoop comprises a fixed plate, the fixed plate is connected with the lower side of the travelling mechanism, two sides of the fixed plate are respectively provided with a hoop plate, the upper part of the hoop plate is a vertical part, the vertical upper end of the hoop plate is hinged with the fixed plate, the lower part of the hoop plate is an arc part, and the lower end of the arc part is provided with a counterweight part;

the fifth step is that when the mobile crane is required to stop moving temporarily, the lower ends of the arc-shaped parts of the two hoop plates of the temporary hoop are connected through bolts, so that the temporary hoop locks the main cable;

When the movable crane is required to resume movement, the bolts of the arc-shaped parts of the two hoop plates of the temporary hoop are taken down, the hoop plates loosen the main cable, the hoop plates rotate around the fixed plate under the action of dead weight, and a clearance gap is formed between the hoop plates and the main cable; the traction winch drives the movable crane to move, and the involution anchor ear can pass through the clearance.

5. The method for using a mobile crane based on a main cable of a suspension bridge according to claim 4, wherein: the lower end of the traveling mechanism is also provided with an adjusting jack, the adjusting jacks are arranged between the two traveling roller assemblies, and the lower end of an output shaft of each adjusting jack can be propped against the track;

And fifthly, when the mobile crane is required to temporarily stop moving, after the temporary anchor ear locks the main cable, driving the lower end of the output shaft of the adjusting jack to extend to be in contact with the track, taking down the bolts of the arc-shaped parts of the two anchor ear plates of the temporary anchor ear, and continuously driving the adjusting jack to enable the lower surface of the walking roller to be out of contact with the track so as to replace the walking roller.