Suspension bridge deck crane front support and rear anchor mechanism

Abstract

The present application relates to the field of suspension bridge deck construction device, disclose a kind of suspension bridge deck crane front support rear anchor mechanism, including main truss, the bottom of the main truss is equipped with beam for installing crane chassis and first oil cylinder and second oil cylinder for alternately supporting the beam, the number of the first oil cylinder and the second oil cylinder is two, two second oil cylinder is interval arrangement, and the second oil cylinder is arranged between two first oil cylinder, rear anchor beam is connected with rear anchor device, by setting inside and outside double-row oil cylinder on beam, and cooperate the design of switchable support mode, make crane front support point can be flexibly selected support position according to the web spacing of different steel box girder, effectively adapt to the various bridge section forms that web width is not the same, diaphragm plate arrangement is changeable, realize a device can be applied to multiple scenarios, substantially reduce equipment repeated investment cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cantilever bridge deck construction devices, in particular to a cantilever bridge deck crane front support and rear anchor mechanism. BACKGROUND

[0002] In cantilever assembly construction, a bridge deck crane is usually used for lifting and positioning steel box girder segments. The bridge deck crane is supported on the installed steel box girder through the front support point, and the rear anchor point is anchored with the steel beam structure to form a stable force system. After the lifting of a beam segment is completed, the bridge deck crane needs to move forward along the bridge axis to the next working position to continue lifting the subsequent beam segments until the main beam is closed.

[0003] However, in actual engineering applications, the structural parameters of different bridge projects, such as steel box girder type, web spacing, and cross plate arrangement, differ greatly, resulting in the fixed positions of the front support point and the rear anchor point of the traditional bridge deck crane, which is difficult to adapt to the construction needs of various beam types. In order to match different web spacings, the crane support structure often needs to be redesigned or modified, which not only increases the equipment investment cost but also prolongs the construction preparation period, seriously affecting the construction efficiency. Secondly, the existing bridge deck crane usually relies on external traction equipment or manual adjustment during the moving process, and the moving process is unstable. When the front and rear support points are alternately supported, the operation is complex and there are safety hazards. In the case of limited adjustment range of the supporting oil cylinder, some cranes cannot accurately adapt to the linear changes or local height differences of the steel beam top surface, affecting the lifting precision and structural safety.

[0004] Therefore, there is an urgent need for a bridge deck crane front support and rear anchor mechanism that can adapt to different steel box girder web spacings, has flexible adjustment capability, can realize autonomous forward movement, and has reasonable stress, in order to improve the universality of the equipment, reduce the construction cost, improve the operation efficiency and safety, and meet the development needs of modern bridge rapid and standardized construction. SUMMARY

[0005] The present application aims to provide a cantilever bridge deck crane front support and rear anchor mechanism to solve the problem that due to the great differences in structural parameters such as steel box girder type, web spacing, and cross plate arrangement of different bridge projects, the positions of the front support point and the rear anchor point of the traditional bridge deck crane are fixed, which is difficult to adapt to the construction needs of various beam types. In order to match different web spacings, the crane support structure often needs to be redesigned or modified, which not only increases the equipment investment cost but also prolongs the construction preparation period, seriously affecting the construction efficiency. The specific technical scheme is as follows:

[0006] The application discloses a front support and rear anchor mechanism of a cantilevered bridge deck crane, which is applied to cantilevered bridge deck operation of various beam type stress web spacings and comprises a main truss.

[0007] As one of the improvements of the above technical scheme, the main truss comprises a left truss and a right truss, the left truss and the right truss are arranged at intervals, and a plurality of connecting rods are connected between the left truss and the right truss.

[0008] As one of the improvements of the above technical scheme, the cross beam is provided with four through holes in the length direction, the through holes arranged on the outer side are used for mounting the first oil cylinder, and the through holes arranged on the inner side are used for mounting the second oil cylinder.

[0009] As one of the improvements of the above technical scheme, the cross beam is provided with a propelling mechanism, the propelling mechanism has a telescopic end, and the propelling mechanism drives the crane on the crane chassis to move in a direction perpendicular to the cross beam through the telescopic end.

[0010] As one of the improvements of the above technical scheme, the propelling mechanism comprises a horizontally arranged jacking oil cylinder, and the telescopic end is a piston rod of the jacking oil cylinder.

[0011] As one of the improvements of the above technical scheme, the bottom of the crane chassis is connected with a forward moving mechanism, the forward moving mechanism comprises a bearing part and a supporting assembly, the top of the bearing part is connected with the crane chassis, the side surface of the bearing part is connected with the propelling mechanism, the bottom of the bearing part is connected with a telescopic supporting leg, and the bottom of the supporting leg is rotatably connected with a roller.

[0012] As one of the improvements of the above technical scheme, the supporting leg is connected with a locking assembly, the locking assembly comprises a telescopic rod, and the telescopic rod protrudes outward from the bottom surface of the supporting leg when the telescopic rod changes from a retracted state to an extended state.

[0013] As one of the improvements of the above technical scheme, the movable end of the first oil cylinder or the second oil cylinder is connected with a circular truncated cone supporting block.

[0014] The beneficial effects of the present application: by setting the inner and outer double-row oil cylinders (first oil cylinder and second oil cylinder) on the cross beam, and cooperating with the design of switchable support mode, the front support point of the crane can flexibly select the support position according to the web spacing of different steel box girders, effectively adapt to various bridge section forms with different web width and variable cross diaphragm arrangement, realize that one equipment can be applied to various scenes, and greatly reduce the repeated investment cost of equipment.

[0015] The integrated pushing oil cylinder on the cross beam serves as a propulsion mechanism, cooperates with the telescopic support foot, the roller and the locking assembly, forms a complete walking system, and can complete smooth forward movement without external traction equipment, is simple and convenient to operate, and is accurate in positioning.

[0016] Additional aspects and advantages of the application will be described in part below, some will become apparent from the following description, or will be understood by those skilled in the art through practice of the application, of course, implementation of any product or method of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating laborious work.

[0018] Figure 1 It is a structural schematic view of the main truss of the present application.

[0019] Figure 2 It is a structural schematic view of the cross beam of the present application.

[0020] Figure 3 It is another structural schematic view of the cross beam of the present application.

[0021] Figure 4 It is a structural schematic view of the second oil cylinder of the present application.

[0022] Figure 5 It is a structural schematic view of the forward movement mechanism of the present application.

[0023] In the figure: 1, main truss; 2, first through hole; 3, second through hole; 4, cross beam; 7, rear anchor beam; 8, forward movement mechanism; 9, pushing oil cylinder; 12, first oil cylinder; 13, second oil cylinder. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0025] Because the structural parameters such as the steel box girder type, web spacing and transverse diaphragm arrangement of different bridge projects have great differences, the front fulcrum and the rear anchor point of the traditional bridge deck crane are fixed, which is difficult to adapt to the construction requirements of various girder types. In order to match different web spacings, the crane support structure often needs to be redesigned or modified, which not only increases the equipment investment cost, but also prolongs the construction preparation period, seriously affecting the construction efficiency.

[0026] Secondly, in the forward movement process of the existing bridge deck crane, external traction equipment or manual adjustment is usually relied on, the stability during the movement process is poor, and when the front and rear fulcrums are alternately supported, the operation is complex and there is a safety hazard. In the case that the adjustment range of the supporting oil cylinder is limited, it is difficult for some cranes to accurately adapt to the linear change or local height difference of the top surface of the steel girder, which affects the lifting precision and structural safety. Please refer to Figures 1-5 The present application provides a front support and rear anchor mechanism of a suspension bridge deck crane to solve the above problems, mainly applied to suspension bridge deck operations of various girder types and stressed web spacings, including a main truss 1, the bottom of the main truss 1 is provided with a cross beam 4 for installing a crane chassis and a first oil cylinder 12 and a second oil cylinder 13 for alternately supporting the cross beam 4, the number of the first oil cylinder 12 and the second oil cylinder 13 is two, the two second oil cylinders 13 are arranged at intervals, and the second oil cylinder 13 is arranged between the two first oil cylinders 12, the first oil cylinder 12 and the second oil cylinder 13 serve as the front fulcrum of the crane chassis, the crane chassis is provided with a rear anchor beam 7, and the rear anchor beam 7 is connected with a rear anchor device.

[0027] Among them, the two second oil cylinders 13 are arranged at intervals along the length direction of the cross beam 4 and located between the two first oil cylinders 12, forming a four-point support layout. The first oil cylinder 12 and the second oil cylinder 13 serve as the front fulcrum of the bridge deck crane chassis, and realize the lifting, leveling and supporting functions of the crane through the extension and retraction actions. During the crane operation, the stable conversion of the front and rear support states can be realized by controlling the alternate extension and retraction of the first oil cylinder 12 and the second oil cylinder 13, so as to meet the stress requirements of the crane under different working conditions.

[0028] Further, the first oil cylinder 12 and the second oil cylinder 13 each have an independent hydraulic control system, and can flexibly select a support point according to an actual structure position of a top surface of a steel box girder (such as a web plate or a transverse partition plate joint), thereby adapting to a stress web plate structure with different intervals. For example, when the interval of the web plate is small, the second oil cylinder 13 on the inner side can be enabled as a main support; when the interval of the web plate is large, the first oil cylinder 12 on the outer side is enabled to support, thereby achieving “one machine with multiple uses”, and significantly improving the adaptability of the equipment.

[0029] By arranging the inner and outer double-row oil cylinders (the first oil cylinder 12 and the second oil cylinder 13), the support position can be flexibly selected according to the interval of the web plate of different steel box girders, thereby achieving universal adaptation to various girder types, avoiding repeated design or modification of the crane due to structural differences, greatly reducing the cost of the equipment, and achieving the “walking type” autonomous forward movement of the bridge crane by combining the alternating support of the oil cylinders with the driving of the jacking oil cylinder 9, without the need for external traction equipment, thereby simplifying the construction process, shortening the operation cycle, and improving the automation level of construction.

[0030] In some embodiments, the main truss 1 includes a left truss and a right truss, the left truss and the right truss are arranged in a spaced manner, and a plurality of connecting rods are connected between the left truss and the right truss. Specifically, the left truss and the right truss serve as the main load-bearing members of the main truss 1, each of which bears various dynamic and static loads such as loads from the hoisting mechanism, the lifting tool, the steel girder segment, and wind load during hoisting, and forms a stable triangular force system through internal top chords, bottom chords, web plates and other members, thereby having good bending, shearing and torsional stiffness. The two trusses are arranged in a spaced manner in space, which not only ensures the lightweight and permeability of the overall structure, but also provides sufficient operation space for subsequent equipment installation and on-site operation.

[0031] To further enhance the integrity and collaborative working ability between the left truss and the right truss, the connecting rods are usually made of high-strength steel pipes or profile steels, and are fixed to corresponding nodes of the left and right trusses by bolt connection or welding, thereby forming a spatially stable spatial truss system.

[0032] The cross beam 4 is provided with four through holes along the length direction thereof, including a first through hole 2 arranged on the outer side and used for mounting the first oil cylinder 12, and a second through hole 3 arranged on the inner side and used for mounting the second oil cylinder 13. The four through holes are integrated on the same cross beam 4, without the need for additional support frames or conversion structures, thereby simplifying the overall structure, reducing the connection nodes, improving the structural reliability, saving the installation space, and being conducive to the lightweight and compact design of the equipment.

[0033] The propulsion mechanism is installed on the cross beam 4 and is used to drive the bridge crane to move autonomously along the bridge axis direction (i.e. the forward direction), so as to realize the step-by-step forward movement of the crane on the steel box beam section which has been installed. The propulsion mechanism has a telescopic execution end, i.e. a telescopic end, through the reciprocating movement of which, the crane chassis and the superstructure thereon are pushed or pulled to move forward.

[0034] Specifically, the propulsion mechanism includes one or more laterally arranged jacking oil cylinders 9, the cylinder body of which is fixed to a specific support node of the cross beam 4 or the main truss 1, and the telescopic end of which is the piston rod of the jacking oil cylinder 9, which extends outward and is connected with the counterforce support on the crane chassis, the load-carrying part or the adjacent beam section. When the hydraulic system is supplied with oil, the piston rod generates an axial thrust or pull force, thereby driving the entire crane to move along the bridge axis direction.

[0035] Here, "laterally arranged" means that the axis direction of the jacking oil cylinder 9 is perpendicular to the length direction of the cross beam 4 (i.e. arranged along the bridge axis direction), so as to ensure that the thrust direction is consistent with the forward movement direction of the crane, and the force transmission path is the shortest and the efficiency is the highest.

[0036] In order to improve the stability and guiding accuracy of the propulsion process, the propulsion mechanism can also be equipped with guide rails, sliding blocks or limiting devices to prevent the piston rod from bending or losing stability when subjected to eccentric load. At the same time, multiple jacking oil cylinders 9 can be controlled synchronously to ensure that the left and right thrust forces are balanced, thereby avoiding the twisting or deviation of the crane during movement.

[0037] In addition, the installation position of the jacking oil cylinder 9 can be flexibly arranged in the middle or at both ends of the cross beam 4 according to the structural layout of the crane, which can adopt "push type" arrangement (the piston rod is pushed forward) or "pull type" arrangement (the piston rod is pulled back through steel strands or pull rods), so as to adapt to different structural forms and construction needs.

[0038] In some embodiments, the bottom of the crane chassis is connected with the advancing mechanism 8, the advancing mechanism 8 includes a load-carrying part and a support assembly, the top of the load-carrying part is connected with the crane chassis, the side of the load-carrying part is connected with the propulsion mechanism, the bottom of the load-carrying part is connected with a telescopic support leg, the bottom of the support leg is rotatably connected with a roller, the support leg is connected with a locking assembly, and the locking assembly includes a telescopic rod which is configured to protrude outward from the bottom surface of the support leg when the telescopic rod changes from the retracted state to the extended state.

[0039] The advancing mechanism 8 is used to support the weight of the whole bridge crane and realize its smooth movement and reliable anchoring on the top surface of the installed steel box girder. The load-carrying part is the main structural component of the advancing mechanism 8, usually adopting a box-type or frame-type structure welded from high-strength steel plates, which has good bending and compression resistance. The top of the load-carrying part is firmly connected with the crane chassis through high-strength bolts or pins to form a stable force transmission path; its side surface is connected with the aforementioned advancing mechanism (such as the piston rod of the jacking cylinder 9) to receive the advancing force and convert it into the forward displacement of the whole machine.

[0040] A support assembly is symmetrically arranged at the bottom of the load-carrying part, which includes one or more extendable legs. The legs are arranged in the vertical direction and can realize up-down extension through hydraulic cylinders, lead screws or mechanical pins, etc. When the crane is in the moving condition, the legs are extended downward so that the rollers at the bottom are in contact with the top surface of the steel box girder, and the load of the whole machine is transmitted from the legs to the bridge structure through the rollers to realize low-resistance rolling forward; when the crane enters the working condition or needs to be temporarily fixed, the legs are further compressed or cooperate with the locking assembly to realize rigid support and improve the stability of the whole machine.

[0041] Regarding the legs, the bottom of the leg is rotatably connected with a roller, which is usually made of high-strength alloy steel and can be subjected to wear-resistant treatment (such as quenching or polyurethane coating) on the surface to reduce the frictional damage between the roller and the steel box girder. The roller is a double-wheel or multi-wheel group structure and has a certain guiding ability, which can smoothly slide on the track or preset path to prevent deviation. The rotary connection mode of the roller allows it to adaptively adjust the posture under complex bridge line conditions (such as longitudinal slope and transverse slope) to improve the walking adaptability.

[0042] The locking assembly is used to provide additional anti-slip protection when the crane stops moving or performs lifting operations. The locking assembly includes an extendable telescopic rod, which is installed inside or on the side wall of the leg and can be switched between the retracted state and the extended state under the action of a driving device (such as a small hydraulic cylinder, a spring mechanism or a manual pin).

[0043] When the crane needs to move, the telescopic rod is in the retracted state, and its end is completely inside the bottom surface of the leg and does not contact the bridge surface, avoiding interference with the roller rolling; when the crane is in place and ready to enter the support or lifting state, the control system triggers the locking assembly to act, and the telescopic rod extends outward, and its end protrudes downward (or obliquely) from the bottom surface of the leg and directly abuts against the top surface of the steel box girder or the preset anchor plate, forming a mechanical anti-slip locking structure.

[0044] This locking mechanism not only can effectively resist the horizontal inertial force in the process of wind load, lifting eccentric load or starting / braking, but also can provide passive safety protection in the case of sudden pressure loss of the hydraulic system, prevent the crane from accidental slipping and significantly improve the safety of high-altitude operations.

[0045] In some embodiments, the movable end of the first oil cylinder 12 or the second oil cylinder 13 is connected with a circular truncated cone support block, which is used as a transition force transmission component between the front support point and the top surface of the steel box girder, for uniformly and safely transmitting the concentrated load of the crane superstructure to the stress area (such as the intersection of the web plate and the transverse plate) of the steel box girder, so as to avoid damage to the main girder structure caused by local stress concentration.

[0046] The circular truncated cone support block is in the shape of a truncated cone (i.e., a circular truncated cone shape with the top small and the bottom large), the top of which is detachably connected with the end of the piston rod of the oil cylinder through a pin shaft, a flange plate or a spherical hinge structure, and the bottom is a large circular pressure bearing surface, which directly contacts the surface of the top plate of the steel box girder. The structure design not only has good bearing capacity, but also has certain self-adaptive centering function: when there is slight inclination or installation deviation of the support surface, the circular truncated cone shape can realize automatic leveling through pressure redistribution of the contact surface, so as to improve the support stability.

[0047] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A front-hoist and rear-anchor mechanism for a cantilevered bridge deck crane, applied to a cantilevered bridge deck operation with various beam types and stress web spacings, characterized in that, The main truss is provided with a cross beam for mounting a crane chassis and first and second oil cylinders for alternately supporting the cross beam, the number of the first and second oil cylinders is two, the two second oil cylinders are arranged at intervals, and the second oil cylinders are arranged between the two first oil cylinders, the first and second oil cylinders serve as front supporting points of the crane chassis, and the crane chassis is provided with a rear anchor beam connected with a rear anchor device. The cross beam is provided with four through holes along its length direction, the through holes arranged on the outer side are used for mounting the first oil cylinders, and the through holes arranged on the inner side are used for mounting the second oil cylinders. The first and second oil cylinders each have an independent hydraulic control system, and can flexibly select supporting points according to the actual structure position of the top surface of the steel box girder, so as to adapt to the stress web structure with different intervals.

2. The front-jack and rear-anchor mechanism for a cantilever-spliced bridge deck crane according to claim 1, characterized in that: The main truss comprises left and right trusses arranged at intervals, and a plurality of connecting rods are connected between the left and right trusses.

3. The front-jack and rear-anchor mechanism for a bridge deck assembling crane according to claim 1, characterized in that: The cross beam is provided with a propulsion mechanism, the propulsion mechanism has a telescopic end, and the propulsion mechanism drives the crane on the crane chassis to move in a direction perpendicular to the cross beam through the telescopic end.

4. The front-jack and rear-anchor mechanism of a cantilever-spliced bridge deck crane according to claim 3, characterized in that: The propulsion mechanism comprises a horizontally arranged jacking oil cylinder, and the telescopic end is a piston rod of the jacking oil cylinder.

5. The front-jack and rear-anchor mechanism for a cantilever bridge deck crane according to claim 3, characterized in that: The bottom of the crane chassis is connected with a forward movement mechanism, the forward movement mechanism comprises a bearing part and a supporting assembly, the top of the bearing part is connected with the crane chassis, the side of the bearing part is connected with the propulsion mechanism, the bottom of the bearing part is connected with a telescopic supporting leg, and the bottom of the supporting leg is rotatably connected with a roller.

6. The front-jack and rear-anchor mechanism of a cantilever-spliced bridge deck crane according to claim 5, characterized in that: The supporting leg is connected with a locking assembly, the locking assembly comprises a telescopic rod, and is configured to protrude outward from the bottom surface of the supporting leg when the telescopic rod changes from a retracted state to an extended state.

7. The front-jack and rear-anchor mechanism for a bridge deck assembly crane according to claim 1, wherein: The movable end of the first oil cylinder or the second oil cylinder is connected with a circular truncated cone supporting block.

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