Front supporting and rear anchoring mechanism of suspended splicing bridge deck crane

Abstract

The invention relates to the field of suspended splicing bridge deck construction devices, and discloses a suspended splicing bridge deck crane front-supporting rear-anchoring mechanism which comprises a main truss, and a cross beam used for installing a crane chassis, a first oil cylinder and a second oil cylinder are arranged at the bottom of the main truss, and the first oil cylinder and the second oil cylinder are used for alternately supporting the cross beam. The number of the first oil cylinders and the number of the second oil cylinders are both two, the two second oil cylinders are arranged in a spaced mode, the second oil cylinders are arranged between the two first oil cylinders, and the rear anchor beam is connected with a rear anchor device. The front supporting point of the crane can flexibly select the supporting position according to the web plate spacing of different steel box girders, various bridge section forms with different web plate widths and changeable diaphragm plate arrangement are effectively adapted, one piece of equipment can be applied to various scenes, and the repeated investment cost of the equipment is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of construction equipment for suspended bridge decks, and more particularly to a front support and rear anchor mechanism for a suspended bridge deck crane. Background Technology

[0002] In cantilever assembly construction, bridge deck cranes are typically used for lifting and positioning steel box girder segments. The bridge deck crane is supported on the installed steel box girder by its front support point, and anchored to the steel beam structure by its rear anchor point, forming a stable force-bearing system. After completing the lifting of one segment, the bridge deck crane needs to move forward along the bridge axis to the next working position to continue lifting subsequent segments until the main beam is closed.

[0003] However, in practical engineering applications, the structural parameters of steel box girders, such as beam type, web spacing, and diaphragm arrangement, vary significantly across different bridge projects. This results in fixed front and rear anchor points for traditional bridge deck cranes, making it difficult to adapt to the construction needs of various beam types. To match different web spacings, it is often necessary to redesign or modify the crane support structure, which not only increases equipment investment costs but also prolongs the construction preparation period, severely impacting construction efficiency. Secondly, existing bridge deck cranes typically rely on external traction equipment or manual adjustment during forward movement, resulting in poor stability during the movement process. Furthermore, the alternating support of the front and rear anchor points is complex and poses safety hazards. With limited adjustment range of the support cylinders, some cranes struggle to accurately adapt to changes in the linearity or local height differences of the steel beam top surface, affecting lifting accuracy 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 web spacings of steel box girders, has flexible adjustment capabilities, can move forward autonomously, and has reasonable stress distribution, so as to improve equipment versatility, reduce construction costs, improve work efficiency and safety, and meet the development needs of modern bridge construction that is rapid and standardized. Summary of the Invention

[0005] The purpose of this invention is to provide a front support and rear anchor mechanism for a cantilever bridge deck crane. This addresses the problem that due to significant differences in structural parameters such as the beam type, web spacing, and diaphragm arrangement of steel box girders in different bridge projects, the fixed positions of the front and rear anchor points of traditional bridge deck cranes are difficult to adapt to the construction needs of various beam types. To match different web spacings, it is often necessary to redesign or modify the crane support structure, which not only increases equipment investment costs but also prolongs the construction preparation period, seriously affecting construction efficiency. The specific technical solution is as follows: A front support and rear anchor mechanism for a cantilever bridge deck crane is disclosed, applicable to cantilever bridge deck operations with various beam types and web spacing. The mechanism includes a main truss, at the bottom of which is a crossbeam for mounting the crane chassis, and a first and a second hydraulic cylinder for alternately supporting the crossbeam. There are two first and two second hydraulic cylinders, spaced apart, with the second cylinder positioned between the two first cylinders. The first and second cylinders serve as the front support points for the crane chassis. The crane chassis is equipped with a rear anchor beam connected to a rear anchoring device.

[0006] As an improvement to the above technical solution, the main truss includes a left truss and a right truss, which are arranged at intervals and connected by several connecting rods.

[0007] As an improvement to the above technical solution, the crossbeam has four through holes along its length. The through holes on the outer side are used to install the first hydraulic cylinder, and the through holes on the inner side are used to install the second hydraulic cylinder.

[0008] As an improvement to the above technical solution, a propulsion mechanism is installed on the crossbeam. 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 crossbeam through the telescopic end.

[0009] As an improvement to the above technical solution, the propulsion mechanism includes a horizontally arranged push cylinder, and the telescopic end is the piston rod of the push cylinder.

[0010] As an improvement to the above technical solution, the bottom of the crane chassis is connected to a forward mechanism, which includes a load-bearing part and a support assembly. The top of the load-bearing part is connected to the crane chassis, the side of the load-bearing part is connected to the propulsion mechanism, and the bottom of the load-bearing part is connected to a retractable support leg, with a roller rotatably connected to the bottom of the support leg.

[0011] As an improvement to the above technical solution, the support leg is connected to a locking assembly, which includes a telescopic rod configured such that when the telescopic rod changes from a retracted state to an extended state, the telescopic rod protrudes outward from the bottom surface of the support leg.

[0012] As an improvement to the above technical solution, a frustum support block is connected to the movable end of the first or second oil cylinder.

[0013] The beneficial effects of this invention are as follows: By setting up inner and outer double-row hydraulic cylinders (first hydraulic cylinder and second hydraulic cylinder) on the crossbeam and combining them 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 adapting to various bridge cross-sections with different web widths and varied diaphragm arrangements, so that one piece of equipment can be applied to multiple scenarios, greatly reducing the cost of repeated equipment investment.

[0014] The push cylinder integrated on the crossbeam serves as the propulsion mechanism. Together with the retractable outriggers, rollers, and locking components, it forms a complete walking system that can move forward smoothly without the need for external traction equipment. It is easy to operate and has precise positioning.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of the main truss of the present invention.

[0018] Figure 2 This is a schematic diagram of the crossbeam structure of the present invention.

[0019] Figure 3 This is a schematic diagram of another structure of the crossbeam of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the second hydraulic cylinder of the present invention.

[0021] Figure 5 This is a schematic diagram of the forward movement mechanism of the present invention.

[0022] In the diagram: 1. Main truss; 2. First through hole; 3. Second through hole; 4. Crossbeam; 7. Rear anchor beam; 8. Forward mechanism; 9. Pushing cylinder; 12. First cylinder; 13. Second cylinder. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Due to the significant differences in structural parameters such as beam type, web spacing, and diaphragm arrangement of steel box girders in different bridge projects, the fixed positions of the front support and rear anchor points of traditional bridge deck cranes make it difficult to adapt to the construction needs of various beam types. In order to match different web spacings, it is often necessary to redesign or modify the crane support structure, which not only increases the equipment investment cost but also prolongs the construction preparation cycle and seriously affects construction efficiency. Secondly, existing bridge deck cranes typically rely on external traction equipment or manual adjustment during forward movement, resulting in poor stability. Furthermore, the alternating support at the front and rear points is complex and poses safety hazards. Some cranes, with limited adjustment range of the support cylinders, struggle to accurately adapt to changes in the alignment of the steel beam's top surface or local height differences, affecting lifting accuracy and structural safety. Please refer to [link / reference needed]. Figures 1-5 This invention provides a front support and rear anchor mechanism for a cantilever bridge deck crane to solve the above-mentioned problems. It is mainly applied to cantilever bridge deck operations with various beam types and web spacing. It includes a main truss 1. The bottom of the main truss 1 is provided with a crossbeam 4 for installing the crane chassis and a first hydraulic cylinder 12 and a second hydraulic cylinder 13 for alternately supporting the crossbeam 4. There are two first hydraulic cylinders 12 and two second hydraulic cylinders 13. The two second hydraulic cylinders 13 are arranged at intervals and are located between the two first hydraulic cylinders 12. The first hydraulic cylinders 12 and the second hydraulic cylinders 13 serve as the front support points of the crane chassis. The crane chassis is provided with a rear anchor beam 7, and the rear anchor beam 7 is connected to a rear anchor device. Two second hydraulic cylinders 13 are spaced apart along the length of the crossbeam 4 and located between the two first hydraulic cylinders 12, forming a four-point support layout. The first hydraulic cylinders 12 and 13 serve as the front support points of the bridge crane chassis, achieving lifting, leveling, and support functions for the entire crane through telescopic movements. During crane operation, the alternating telescopic movements of the first and second hydraulic cylinders 12 and 13 can be controlled to smoothly switch between front and rear support states, meeting the crane's stress requirements under different working conditions. Furthermore, both the first hydraulic cylinder 12 and the second hydraulic cylinder 13 are equipped with independent hydraulic control systems, which can flexibly select the support point according to the actual structural position of the top surface of the steel box girder (such as the junction of the web and the transverse diaphragm), thereby adapting to the stress-bearing web structure with different spacing. For example, when the web spacing is small, the inner second hydraulic cylinder 13 can be used as the main support; when the web spacing is large, the outer first hydraulic cylinder 12 is used for support, realizing "one machine for multiple uses" and significantly improving the adaptability of the equipment.

[0025] By setting up internal and external double-row hydraulic cylinders (first hydraulic cylinder 12 and second hydraulic cylinder 13), the support position can be flexibly selected according to the web spacing of different steel box girders, realizing universal adaptation to various beam types, avoiding repeated design or modification of the crane due to structural differences, and significantly reducing equipment costs. By adopting a combination of alternating hydraulic cylinder support and jacking hydraulic cylinder 9 drive, the bridge deck crane can achieve "walking" autonomous forward movement without the need for external traction equipment, simplifying the construction process, shortening the operation cycle, and improving the level of construction automation.

[0026] In some embodiments, the main truss 1 includes a left truss and a right truss, which are spaced apart and connected by several links. Specifically, the left and right trusses, as the main load-bearing components of the main truss 1, each bear various dynamic and static loads from the lifting mechanism, lifting equipment, steel beam segments, and wind loads during the hoisting process. They form a stable triangular force system through their internal upper chord, lower chord, and web members, possessing good bending, shear, and torsional stiffness. The spatial spacing of the two trusses ensures both the lightweight and openness of the overall structure and provides ample operating space for subsequent equipment installation and on-site operations.

[0027] To further enhance the integrity and collaborative working ability between the left and right trusses, these connecting rods are usually made of high-strength steel pipes or sections and are fixed to the corresponding nodes of the left and right trusses by bolting or welding, forming a spatially stable space truss system.

[0028] The crossbeam 4 has four through holes along its length, including a first through hole 2 on the outer side for mounting the first hydraulic cylinder 12, and a second through hole 3 on the inner side for mounting the second hydraulic cylinder 13. The four through holes are integrated on the same crossbeam 4, eliminating the need for additional support frames or conversion structures, simplifying the overall structure, reducing connection nodes, improving structural reliability, and saving installation space, which is conducive to the lightweight and compact design of the equipment.

[0029] A propulsion mechanism is installed on crossbeam 4. This mechanism drives the bridge crane to move autonomously along the bridge axis (i.e., the forward direction), enabling the crane to move forward in a step-like manner on the installed steel box girder segments. The propulsion mechanism has a retractable actuator—a telescopic end—which, through its reciprocating motion, pushes or pulls the crane chassis and its superstructure forward.

[0030] Specifically, the propulsion mechanism includes one or more transversely arranged jacking cylinders 9, the cylinder bodies of which are fixed to specific support nodes of the crossbeam 4 or the main truss 1, and the telescopic end of which is the piston rod of the jacking cylinder 9. The piston rod extends outward and connects to the reaction support on the crane chassis, the load-bearing part, or the adjacent beam segment. When the hydraulic system supplies oil, the piston rod generates axial thrust or tension, thereby driving the entire crane to move along the bridge axis.

[0031] Among them, "lateral setting" means that the axis of the jacking cylinder 9 is perpendicular to the length of the crossbeam 4 (i.e., arranged along the bridge axis), so as to ensure that its thrust direction is consistent with the forward direction of the crane, and the force transmission path is the shortest and the efficiency is the highest.

[0032] To improve the stability and guiding accuracy of the propulsion process, the propulsion mechanism can also be equipped with guide rails, sliders, or limit devices to prevent the piston rod from bending or becoming unstable under eccentric loads. Simultaneously, multiple jacking cylinders 9 can be controlled synchronously to ensure balanced thrust on both sides, preventing twisting or deviation of the crane during movement.

[0033] In addition, the installation position of the jacking cylinder 9 can be flexibly set in the middle or both ends of the crossbeam 4 according to the structure layout of the crane. It can be arranged in a "push" manner (piston rod pushes forward) or in a "pull" manner (pull back through steel strand or tie rod) to adapt to different structural forms and construction needs.

[0034] In some embodiments, a forward mechanism 8 is connected to the bottom of the crane chassis. The forward mechanism 8 includes a load-bearing part and a support assembly. The top of the load-bearing part is connected to the crane chassis, and the side of the load-bearing part is connected to a propulsion mechanism. A retractable outrigger is connected to the bottom of the load-bearing part. A roller is rotatably connected to the bottom of the outrigger. A locking assembly is connected to the outrigger. The locking assembly includes a telescopic rod, configured such that when the telescopic rod changes from a retracted state to an extended state, the telescopic rod protrudes outward from the bottom surface of the outrigger.

[0035] The forward mechanism 8 supports the weight of the entire bridge deck crane and enables its smooth movement and reliable anchoring on the top surface of the installed steel box girder. The load-bearing part is the main structural component of the forward mechanism 8, typically a box-type or frame structure welded from high-strength steel plates, possessing excellent bending and compressive resistance. The top of the load-bearing part is firmly connected to the crane chassis via high-strength bolts or pins, forming a stable force transmission path; its sides are connected to the aforementioned propulsion mechanism (such as the piston rod of the jacking cylinder 9), receiving propulsion force and converting it into forward displacement of the entire machine.

[0036] Symmetrical support components are arranged at the bottom of the load-bearing section, each including one or more retractable outriggers. The outriggers are vertically oriented and can extend and retract vertically via hydraulic cylinders, lead screws, or mechanical pins. When the crane is in motion, the outriggers extend downwards, bringing the bottom rollers into contact with the top surface of the steel box girder. This transfers the entire load from the outriggers to the bridge deck structure via the rollers, enabling low-resistance rolling forward. When the crane enters operational mode or requires temporary fixation, the outriggers are further compressed or engage with locking components to provide rigid support, improving overall stability.

[0037] Regarding the outriggers, rollers are rotatably connected to the bottom of each outrigger. These rollers are typically made of high-strength alloy steel, and their surfaces can be treated with wear-resistant processes (such as quenching or polyurethane coating) to reduce frictional damage between them and the steel box girder. The rollers have a dual-wheel or multi-wheel structure, providing a certain degree of guidance and allowing them to glide smoothly on tracks or pre-set paths, preventing deviation. The rotatable connection of the rollers allows them to adaptively adjust their posture under complex bridge deck alignments (such as longitudinal and transverse slopes), improving their adaptability.

[0038] The locking assembly provides additional anti-slip protection when the crane is stopped or during lifting operations. The locking assembly includes a telescopic rod mounted inside the outriggers or on the sidewall, which can be switched between a retracted and extended state by a drive mechanism such as a small hydraulic cylinder, spring mechanism, or manual latch.

[0039] When the crane needs to be moved, the telescopic boom is in a retracted state, with its end completely inside the bottom surface of the outrigger and not in contact with the bridge deck to avoid interfering with the rolling of the rollers. When the crane is in position and ready to enter the support or lifting state, the control system triggers the locking component to act, and the telescopic boom extends outward, with its end protruding downward (or obliquely) from the bottom surface of the outrigger and directly abutting against the top surface of the steel box girder or the preset anchor plate, forming a mechanical anti-slip locking structure.

[0040] This locking mechanism can not only effectively resist wind loads, uneven loading during hoisting, or horizontal inertial forces during start / brake, but also provide passive safety protection in case of sudden events such as hydraulic system depressurization, preventing the crane from slipping unexpectedly and significantly improving the safety of high-altitude operations.

[0041] In some embodiments, the movable end of the first hydraulic cylinder 12 or the second hydraulic cylinder 13 is connected to a frustum support block. The frustum support block serves as a transition force transmission component between the front support point and the top surface of the steel box girder, and is used to uniformly and safely transfer the concentrated load of the upper structure of the crane to the stress area of ​​the steel box girder (such as the intersection of the web and the transverse diaphragm), so as to avoid local stress concentration from causing damage to the main beam structure.

[0042] The frustum support block is truncated conical in shape (i.e., a frustum shape that is smaller at the top and larger at the bottom). Its top is detachably connected to the end of the hydraulic cylinder piston rod via a pin, flange, or ball joint structure, while its bottom is a large circular bearing surface that directly contacts the top surface of the steel box girder. This structural design not only has good load-bearing capacity but also possesses a certain degree of self-aligning capability: when there is a slight tilt or installation deviation in the support surface, the frustum shape can automatically level itself through pressure redistribution on the contact surface, thereby improving support stability.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A front support and rear anchor mechanism for a cantilever bridge deck crane, applicable to cantilever bridge deck construction with varying web spacing for different beam types, characterized in that... The system includes a main truss, at the bottom of which is provided a crossbeam for mounting the crane chassis and a first hydraulic cylinder and a second hydraulic cylinder for alternately supporting the crossbeam. There are two first hydraulic cylinders and two second hydraulic cylinders, with the two second hydraulic cylinders spaced apart and positioned between the two first hydraulic cylinders. The first hydraulic cylinders and the second hydraulic cylinders serve as the front support points of the crane chassis. The crane chassis is provided with a rear anchor beam, which is connected to a rear anchor device.

2. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 1, characterized in that: The main truss includes a left truss and a right truss, which are spaced apart and connected by several connecting rods.

3. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 1, characterized in that: The crossbeam has four through holes along its length. The through holes on the outer side are used to install the first hydraulic cylinder, and the through holes on the inner side are used to install the second hydraulic cylinder.

4. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 3, characterized in that: A propulsion mechanism is installed on the crossbeam. 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 crossbeam through the telescopic end.

5. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 4, characterized in that: The propulsion mechanism includes a horizontally arranged push cylinder, and the telescopic end is the piston rod of the push cylinder.

6. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 4, characterized in that: The bottom of the crane chassis is connected to a forward mechanism, which includes a load-bearing part and a support assembly. The top of the load-bearing part is connected to the crane chassis, the side of the load-bearing part is connected to the propulsion mechanism, and the bottom of the load-bearing part is connected to a retractable support leg. The bottom of the support leg is rotatably connected to a roller.

7. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 6, characterized in that: The support leg is connected to a locking assembly, which includes a telescopic rod configured such that when the telescopic rod changes from a retracted state to an extended state, the telescopic rod protrudes outward from the bottom surface of the support leg.

8. The front support and rear anchor mechanism for a cantilever bridge deck crane according to claim 1, characterized in that: The movable end of the first or second hydraulic cylinder is connected to a frustum support block.

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