A bridge girder behind the bridge girder and the bridge girder with the same

Abstract

The application discloses a bridge girder and a bridge girder machine with the same. The bridge girder machine comprises a rear girder body, a door-shaped main rear support leg and an auxiliary rear support leg. The auxiliary rear support leg is movably arranged at one end of the rear girder body. The main rear support leg is elongatable or shortenable. The main rear support leg is reversibly arranged at one end of the rear girder body and can be reversibly turned down to be vertical or turned up to be stored in the lower part and both sides of the rear girder body. The bridge girder machine can flexibly switch the state of the main rear support leg by arranging the reversibly turned main rear support leg. The main rear support leg is turned up to be stored in the transportation and turned down to support the ground in the bridge construction, so that the existing bridge girder machine needs to be disassembled and transported, the working mode of on-site assembly and use is improved, the bridge girder machine is more flexible and faster in the scene, and the flow and mobility of the whole bridge girder machine are improved.

Description

Technical Field

[0001] This application relates to the field of bridge erection equipment, and in particular to a rear main beam of a bridge erection machine and a bridge erection machine having the same. Background Technology

[0002] A bridge launching machine is a specialized construction machine used to lift precast reinforced concrete (or prestressed concrete) beams onto bridge supports (piers). It is one of the main pieces of equipment for safe and rapid bridge construction. To ensure that the bridge launching machine can safely and stably cross the span, it is equipped with a safe and reliable support leg system.

[0003] Currently, the outrigger system of bridge erecting machines generally includes auxiliary outriggers, front outriggers, middle outriggers, and rear outriggers. During use, the rear outriggers are typically fixed to the rear beam, providing stable support for the bridge beam. However, current bridge erecting machines mostly use a fixed structural design for the rear outriggers and the beam, and the rear outriggers lack deformability. Therefore, during transportation, the rear outriggers need to be disassembled from the rear beam, transported to the site, and then reassembled. This results in poor overall mobility of the bridge erecting machine, especially during emergency rescue and disaster relief operations, making rapid response difficult. The entire transportation and on-site setup process is extremely labor-intensive, time-consuming, and inefficient.

[0004] Therefore, it is necessary to develop a rear main beam for a bridge erecting machine and a bridge erecting machine with it to solve the above technical problems. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a rear main beam of a bridge erecting machine and a bridge erecting machine having the same, in order to improve the poor mobility and maneuverability of existing bridge erecting machines that rely on "disassembly and transportation + on-site installation and dismantling".

[0006] The present invention solves the above-mentioned technical problems mainly through the following technical solutions: A rear main beam for a bridge erecting machine is provided, comprising a rear beam body, a portal-shaped main rear support leg, and an auxiliary rear support leg. The auxiliary rear support leg is mounted vertically on one end of the rear beam body. The main rear support leg is extendable or retractable. The main rear support leg is mounted vertically on one end of the rear beam body and can be flipped downwards to be vertical or flipped upwards to be stored in the lower part and sides of the rear beam body.

[0007] Furthermore, the main rear support leg includes a crossbeam and a retractable rear support leg vertically disposed on the same side at both ends of the crossbeam. The crossbeam is hinged to the lower part of one end of the rear beam body, and one end of the rear beam body is provided with a drive component that is connected to the main rear support leg and drives it to rotate up and down.

[0008] Furthermore, a rear support boss is provided at the lower part of one end of the rear beam body, and the other side of the middle part of the crossbeam is hinged to the edge of the rear support boss. The driving member is installed at the lower end of the rear beam body and connected to the crossbeam. The driving member is used to drive the crossbeam to flip up to support the lower part of the rear support boss and drive the rear support leg to move vertically downward, or drive the crossbeam to flip up away from the rear support boss and drive the rear support leg to flip up and move to both sides of the rear beam body.

[0009] Furthermore, the rear support leg includes a hollow fixed support leg and a hollow movable support leg. One end of the fixed support leg is vertically connected and fixed to the corresponding end of the crossbeam. One end of the movable support leg extends into the other end of the fixed support leg. The fixed support leg and the movable support leg are respectively provided with a first telescopic drive member connected to each of them.

[0010] Furthermore, the crossbeam includes a hollow fixed beam and two movable beams. One end of each of the two movable beams is inserted into the two ends of the fixed beam. The two rear support legs are respectively vertically fixed on the same side of the two movable beams at their opposite ends. The fixed beam is provided with a second telescopic drive member that connects to the two movable beams and drives them to move closer or further apart.

[0011] Furthermore, the second telescopic drive component is provided in two sets, and the two sets of the second telescopic drive components are respectively connected to the two movable beams one by one.

[0012] Furthermore, the auxiliary rear support leg includes a ground support base and a column. The column is vertically fixed to the upper end of the ground support base. The column is slidably assembled with one end of the rear beam and connected by a third telescopic drive member. The third telescopic drive member is used to drive the column to move up and down relative to the rear beam.

[0013] Furthermore, there are two columns, which are vertically fixed to the upper parts of both ends of the ground support base.

[0014] Furthermore, each end of the rear beam is provided with a telescopic channel on both sides corresponding to the column and extending vertically. The two columns extend into the corresponding telescopic channels. Two third telescopic drive members are provided and installed in the telescopic channels respectively. The two third telescopic drive members are connected to the two columns respectively.

[0015] The beneficial effects of the rear main beam of the bridge erecting machine of this utility model are as follows: By setting up a main and rear outrigger that can be flipped up, the state of the main and rear outriggers can be flexibly switched. They can be flipped up and retracted during transportation, and flipped down and placed on the ground for support during bridge erection operations. This improves the existing operation mode of bridge erection machines, which requires the outriggers to be disassembled from the beam for transportation and then reassembled on site. This makes the bridge erection machine more flexible and faster to move, and improves the overall mobility and maneuverability of the bridge erection machine.

[0016] A bridge erecting machine is also provided, including a rear main beam of the bridge erecting machine. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional view of the structure of the main rear support leg of the bridge erecting machine when it is folded up and stored in the rear main beam according to an embodiment of this utility model; Figure 2 This is a three-dimensional view of the structure of the main rear support leg of the bridge erecting machine after it is flipped down and extended according to an embodiment of the present utility model. Figure 3 This is a side view of the structure of the auxiliary rear support leg in the rear main beam of the bridge erecting machine after extension, provided in this embodiment of the utility model. Figure 4 This is a side view of the structure of the main rear support leg of the bridge erecting machine when it is tilted down and not extended, according to an embodiment of this utility model. Figure 5 This is a side view of the structure of the main rear support leg of the bridge erecting machine after it is flipped down and extended, according to an embodiment of this utility model. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] For details, please refer to Figures 1 to 5 This application provides a rear main beam for a bridge erecting machine, including a rear beam body 21, a main rear support leg 22, and an auxiliary rear support leg 23.

[0025] Among them, the rear beam 21 adopts the conventional long and straight beam of the existing bridge erecting machine, and multiple weight reduction holes can be opened along the length of the beam.

[0026] Generally, the bridge erecting machine's beam body includes a front beam, a middle beam, and a rear beam. The three beams are arranged in a straight line and their ends are assembled together. The front beam and the middle beam are respectively equipped with a front support leg assembly and a middle support leg assembly for ground support. In this embodiment, by grounding the main rear support leg 22 on the rear beam 21 to the ground, and in conjunction with the ground support of the support leg assemblies on the other two beams, the entire bridge erecting machine's beam body can be stably supported on the ground.

[0027] Among them, the main rear support leg 22 adopts a portal-shaped support leg design, the purpose of which is that when the two rear support legs 222 of the main rear support leg 22 are grounded and supported, the distance between them can allow concrete beams and vehicles carrying beams to pass smoothly.

[0028] Specifically, the main rear support leg 22 is mounted on one end of the rear beam 21 using an up-and-down flipping assembly method. It can be flipped downwards to support the ground vertically, thus providing stable support for the rear beam 21. Alternatively, it can be flipped upwards when not in operation and stored in the lower part and sides of the rear beam 21, avoiding occupying a large space under the rear beam 21. This results in the entire rear beam 21, along with the main rear support leg 22, having a small vertical height or space ratio, which is very convenient for transportation and loading.

[0029] In this embodiment, the overall length of the main rear support leg 22 is adjustable, allowing it to be extended or shortened. Specifically, when flipped to a vertically downward position, adjusting its length (i.e., its current height) allows it to support the ground while simultaneously adjusting the suspended height of the beam. Furthermore, shortening the main rear support leg 22 during storage prevents it from tilting too high when stored on either side of the rear beam 21.

[0030] In some embodiments, see Figure 1 and Figure 2 The main rear support leg 22 includes a crossbeam 221 and retractable rear support legs 222 vertically arranged on the same side at both ends of the crossbeam 221. The crossbeam 221 is hinged to the lower part of one end of the rear beam 21 and is driven to rotate up and down by a drive unit mounted on the main rear support leg 22. The length of the rear support leg 222 can be flexibly adjusted. The drive unit can drive the entire main rear support leg 22 to rotate downward to a vertical state and support the ground after the rear support leg 222 is extended. Alternatively, during transportation, the entire main rear support leg 22 can be driven to rotate upward, so that the two rear support legs 222 are tilted upward and held on both sides of the rear beam 21, reducing the overall size and enabling flexible deployment after storage, transportation, and arrival at the site without disassembly.

[0031] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The lower part of one end of the rear beam 21 is provided with a rear support boss 211. The lower surface of the rear support boss 211 is a horizontal plane. The other side edge of the middle part of the crossbeam 221 is hinged to the edge of the rear support boss 211. A height difference is achieved between the rear support boss 211 and the lower end of the rear beam 21. This height difference can reserve some of the movement space of the driving component to a certain extent, so that the driving component can better drive the crossbeam 221 to rotate.

[0032] In this embodiment, a drive unit is mounted on the lower end of the rear beam 21 and connected to the crossbeam 221. The drive unit causes the crossbeam 221 to rotate around the hinge point with the edge of the rear support boss 211. This rotation can either bring the crossbeam 221 into contact with the lower surface of the rear support boss 211, or separate them. When the crossbeam 221 is in contact with the lower surface of the rear support boss 211, both rear support legs 222 are in a vertical position. Combined with the extension of the rear support legs 222, this provides stable support for the rear beam 21. After the crossbeam 221 rotates away from the rear support boss 211, it approaches the lower end of the rear beam 21, and the rear support legs 222 rotate to the sides of the rear beam 21, tilting upwards. This effectively stores the main rear support legs 22 in the lower part and sides of the rear beam 21, greatly facilitating transportation.

[0033] More specifically, the drive unit can be a conventionally compatible hydraulic cylinder, with the cylinder body mounted on the lower part of one end of the rear beam 21, and its telescopic rod mounted on the side end of the crossbeam 221 via a hinge seat.

[0034] In some embodiments, considering that when the drive component is directly exposed on the lower part of the rear beam 21, it may occupy a large space when driving the main rear support leg 22 to flip, which would require the main rear support leg 22 to be installed at a greater downward height on the rear beam 21. This could result in a less compact structural assembly between the main rear support leg 22 and the rear beam 21, with significant space remaining and poor structural stability. Therefore, a groove for mounting the drive component is formed at the lower part of one end of the rear beam 21, with most of the drive component body hidden within this groove. This avoids occupying much space in the lower part of the rear beam 21, resulting in a more compact structure between the main rear support leg 22 and the rear beam 21 after the main rear support leg 22 flips upward.

[0035] In this embodiment, see Figure 3 , Figure 4 , Figure 5 Two connecting ears (represented by c in the figure) can be provided on the side of the crossbeam 221 near the other side. A rotating shaft is installed on one side of the rear support boss 211. The two ends of the rotating shaft are rotatably assembled with the two connecting ears to realize the hinge connection between the crossbeam 221 and the rear support boss 211.

[0036] In some embodiments, the aforementioned driving component may also use a rotary cylinder instead of a telescopic cylinder. The rotary cylinder is installed below the rear beam 21 near the rear support boss 211, and its rotating part is connected to the middle of the crossbeam 221, or connected to the crossbeam 221 through a connector, thereby driving the main rear support leg 22 to swing.

[0037] In some other embodiments, the aforementioned drive unit can also be designed as a winch mechanism, installed in the inner cavity of the rear beam 21, and connected to the rear support leg 222 (non-extendable part) of the main rear support leg 22 by a rope. The main rear support leg 22 can be flipped up and down by winding and unwinding the rope. However, it should be noted that with this structure, a flange plate needs to be provided at the edge of the rear support boss 211. After the crossbeam 221 abuts against the rear support boss 211, it is locked to the crossbeam 221 by bolts passing through the flange plate to ensure that the crossbeam 221 will not swing relative to the front beam during operation.

[0038] Of course, the aforementioned bolts can be replaced with a pin-locking structure. The pin can be connected to a drive structure (such as a hydraulic cylinder) that drives it to move up and down. After the crossbeam 221 is in contact with the support boss 211, it automatically drives the pin downward to insert into the hole.

[0039] In this embodiment, the rear support leg 222 adopts a two-segment plug-in combination structure, and the length can be flexibly adjusted by moving the two segments relative to each other. Specifically, the rear support leg 222 includes a hollow fixed leg and a hollow movable leg, which are designed to interlock. A first telescopic drive component is installed inside each leg, connecting to both. The length of the entire rear support leg 222 is flexibly adjusted by extending and shortening the first telescopic drive component. In this structure, the first telescopic drive component is hidden inside the rear support leg 222 and is not exposed, thus providing some protection for itself. It also prevents accidental contact by external personnel during its extension and retraction, resulting in a more compact and aesthetically pleasing structural design.

[0040] Both the fixed and movable outriggers are square tubular or have non-circular cross-sections. The gap between them after insertion is very small, preventing relative rotation and allowing only extension and retraction along their length, thus improving structural stability. During assembly, one end of the fixed outrigger is perpendicularly connected and fixed to the corresponding end of the crossbeam 221. One end of the movable outrigger extends into the other end of the fixed outrigger. A base with a cross-sectional area larger than the main body area can be installed at the other end of the movable outrigger, slightly increasing the contact area for ground support and making the support more stable.

[0041] The first telescopic drive component mentioned above uses a conventionally compatible hydraulic cylinder. The cylinder body is connected to the inner wall of one end of the fixed outrigger, and the telescopic rod is connected to the inner wall of the other end of the movable outrigger.

[0042] In some embodiments, during transportation, the rear support leg 222 needs to be retracted to its shortest length. Throughout the transportation process or during idle periods, in order to ensure that the rear support leg 222 always remains in the retracted state, the first telescopic drive member needs to always remain in the retracted state, which will cause a certain load burden on it. Therefore, this embodiment adds a mechanical locking structure at the fixed support leg and the movable support leg to keep them in the retracted state, thereby releasing the first telescopic drive member so that it no longer operates and remains in the retracted state when the rear support leg 222 is in the retracted state.

[0043] Specifically, a first insertion hole (represented by a in the figure) is provided at the other end of the fixed support leg and a second insertion hole is provided at the other end of the movable support leg. When the rear support leg 222 is in the retracted state, the first insertion hole and the second insertion hole are in the same hole state, and a locking pin can be inserted between them to lock and retain the rear support leg 222 in the retracted state. At this time, the first telescopic drive can stop running.

[0044] In some embodiments, the spacing between the two rear support legs 222 can be adjustable. The spacing can be adjusted before the two rear support legs 222 are placed on the ground for support. This design aims to accommodate beams of different widths and allow for the smooth passage of transport vehicles. The crossbeam 221 is designed as a multi-segment insert structure, and these segments can move relative to each other, allowing the crossbeam 221 to extend or shorten.

[0045] Specifically: the crossbeam 221 includes a hollow fixed beam and two movable beams. One end of each of the two movable beams is inserted into the two ends of the fixed beam. The two rear support legs 222 are vertically fixed on the same side of the two movable beams at opposite ends. The two movable beams can move relative to the fixed beam, thereby adjusting the distance between the two rear support legs 222.

[0046] The second telescopic drive component, connected to each of the two movable beams, is installed inside the crossbeam 221. This second telescopic drive component drives the two movable beams to extend or retract along the crossbeam 221 from both ends. The second telescopic drive component is concealed inside the crossbeam 221, ensuring a more compact and aesthetically pleasing structural design while preventing damage from external impacts. It also avoids accidental contact by personnel during its extension and retraction operation, thus preventing unsafe accidents.

[0047] In some embodiments, the second telescopic drive can be a set of double-acting hydraulic cylinders, that is, hydraulic cylinders that can extend and retract at both ends. The main body of the hydraulic cylinder is fixed inside the fixed beam, and the telescopic parts at both ends extend into the two movable beams respectively and are connected to the inner wall of the movable beams. During operation, the cylinder bodies remain relatively different, and the telescopic parts at both ends extend or shorten synchronously, so as to realize the movement of the two movable beams relative to the fixed beam and realize the adjustment of the distance between the two rear support legs 222.

[0048] In other embodiments, the second telescopic drive can be two sets of second telescopic drive components. A fixed plate is designed in the middle of the fixed beam, and the two sets of second telescopic drive components are respectively mounted on both sides of the fixed plate. The telescopic parts of the two components extend into the interior of the two movable beams and connect with the inner wall of the movable beams. The second telescopic drive components use hydraulic cylinders of a suitable model.

[0049] In this embodiment, both the fixed beam and the movable beam are non-circular cross-section beams. After they are inserted, they will not rotate relative to each other, thus ensuring the orientation of the rear support leg 222. Specifically, both the fixed beam and the movable beam are square tubular beams.

[0050] In this embodiment, the main purpose of the auxiliary rear support leg 23 is that during the initial stage of bridge erection, the bridge erecting machine will use the extension of the auxiliary rear support leg 23 to land, so that the beam is suspended at a certain height, and there is enough space below the beam to allow the main rear support leg 22, which is in a retracted state, to flip downward. After the main rear support leg 22 flips downward and extends, it can provide stable support for the beam, and the auxiliary rear support leg 23 can then be retracted and stopped.

[0051] Among them, see Figure 1 , Figure 2 , Figure 3 The auxiliary rear support leg 23 includes a ground support base 231 and a column 232. The column 232 is vertically fixed to the upper end of the ground support base 231. The column 232 is slidably assembled with one end of the rear beam 21. With the help of the third telescopic drive component to drive the column 232 to move up and down, the flexible switching between the ground support base 231 in the ground support and retracted state can be realized.

[0052] In some embodiments, two columns 232 are designed and fixed to the upper ends of the landing support 231 respectively. By having the two columns 232 slide in cooperation with one end of the rear beam 21, a relatively stable support system can be provided after the landing support 231 is landed, avoiding the problem of large load and poor stability when using a single column 232, thus improving safety performance.

[0053] In some embodiments, vertically extending telescopic channels 212 are integrally formed on both sides of one end of the rear beam 21. Two columns 232 are inserted into the two telescopic channels 212 from bottom to top. Each telescopic channel 212 is equipped with a third telescopic drive component to work together to achieve synchronous lifting and lowering of the two columns 232.

[0054] Specifically, the top of the telescopic channel 212 is closed, and the column 232 is a hollow column. The third telescopic drive component is set inside the column 232 and connected to both the column 232 and the top wall of the telescopic channel 212. During the extension and retraction of the third telescopic drive component, the column 232 can be raised and lowered relative to the telescopic channel 212. The third telescopic drive component is also designed to be hidden within the telescopic channel 212, which has a compact and aesthetically pleasing structure, avoids damage from external collisions, and prevents accidents caused by accidental contact by external personnel during its extension and retraction.

[0055] In this embodiment, the third telescopic drive component adopts a conventionally compatible hydraulic cylinder. One end of the cylinder body is fixed to the top wall of the telescopic channel 212, and the end of the telescopic rod is connected to the bottom wall of the inner cavity of the column 232.

[0056] In some embodiments, a mechanical locking structure is provided on the telescopic channel 212. This mechanical locking structure effectively locks the column 232 with the telescopic channel 212 after the column 232 rises to the high position, thereby releasing the third telescopic drive member. This allows the third telescopic drive member to avoid maintaining a retracted state for a long time, reducing energy consumption. It also prevents the auxiliary rear support leg 23 from falling when retracting, thus improving safety.

[0057] Specifically, referring to the aforementioned mechanical locking structure, when the column 232 is in the high-retracted state, the lower end of the telescopic channel 212 and the lower end of the column 232 are respectively provided with pin holes (b in the figure). The pin is inserted into the pin hole to achieve mechanical locking between the column 232 and the telescopic channel 212. When extension is required, the pin is pulled out and the third telescopic drive component can be extended normally.

[0058] This application embodiment also provides a bridge erecting machine, including the aforementioned rear main beam of the bridge erecting machine. In this bridge erecting machine, the main rear support leg 22 is part of the rear beam 21 and is permanently maintained on the rear beam 21. By flexibly switching and flipping the state, different needs for transportation and on-site construction can be met, greatly improving the mobility and fluidity of the bridge erecting machine.

[0059] It should be noted that the bridge erecting machine is equipped with hydraulic oil lines adapted to the oil circuit of the oil cylinder, as well as corresponding solenoid valves at the valve ports, and is connected to a complete control system to realize automated control of the oil cylinder operation.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The foregoing has provided a detailed description of the rear main beam of a bridge erecting machine and the bridge erecting machine having the same as described in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A rear main beam of a bridge erecting machine, characterized in that: It includes a rear beam (21), a portal-shaped main rear support leg (22) and an auxiliary rear support leg (23). The auxiliary rear support leg (23) is mounted on one end of the rear beam (21) and can move up and down. The main rear support leg (22) can be extended or shortened. The main rear support leg (22) is mounted on one end of the rear beam (21) and can be flipped up and down. It can be flipped down to be vertical or flipped up to be stored in the lower part and sides of the rear beam (21).

2. The rear main beam of a bridge erecting machine according to claim 1, characterized in that: The main rear support leg (22) includes a crossbeam (221) and a retractable rear support leg (222) vertically arranged on the same side at both ends of the crossbeam (221). The crossbeam (221) is hinged to the lower part of one end of the rear beam body (21). One end of the rear beam body (21) is provided with a drive member that is connected to the main rear support leg (22) and drives it to rotate up and down.

3. The rear main beam of a bridge erecting machine according to claim 2, characterized in that: The lower part of one end of the rear beam (21) is provided with a rear support boss (211). The other side of the middle part of the crossbeam (221) is hinged to the edge of the rear support boss (211). The driving member is installed at the lower end of the rear beam (21) and connected to the crossbeam (221). The driving member is used to drive the crossbeam (221) to flip to support the lower part of the rear support boss (211) and drive the rear support leg (222) to move vertically downward, or drive the crossbeam (221) to flip away from the rear support boss (211) and drive the rear support leg (222) to flip upward and move to both sides of the rear beam (21).

4. The rear main beam of a bridge erecting machine according to claim 2, characterized in that: The rear support leg (222) includes a hollow fixed leg and a hollow movable leg. One end of the fixed leg is vertically connected and fixed to the corresponding end of the crossbeam (221). One end of the movable leg extends into the other end of the fixed leg. The fixed leg and the movable leg are respectively provided with a first telescopic drive member connected to them.

5. The rear main beam of a bridge erecting machine according to claim 2, characterized in that: The crossbeam (221) includes a hollow fixed beam and two movable beams. One end of each of the two movable beams is inserted into the two ends of the fixed beam. The two rear support legs (222) are respectively vertically fixed on the same side of the two movable beams at their ends that are far apart from each other. The fixed beam is provided with a second telescopic drive member that connects to the two movable beams and drives them to move closer or further apart.

6. The rear main beam of a bridge erecting machine according to claim 5, characterized in that: The second telescopic drive component is provided in two sets, and the two sets of the second telescopic drive components are respectively connected to the two movable beams one by one.

7. The rear main beam of a bridge erecting machine according to any one of claims 1 to 6, characterized in that: The auxiliary rear support leg (23) includes a ground support base (231) and a column (232). The column (232) is vertically fixed to the upper end of the ground support base (231). The column (232) is slidably assembled with one end of the rear beam (21) and connected by a third telescopic drive member. The third telescopic drive member is used to drive the column (232) to move up and down relative to the rear beam (21).

8. The rear main beam of a bridge erecting machine according to claim 7, characterized in that: Two columns (232) are provided and are vertically fixed to the upper parts of both ends of the ground support base (231).

9. The rear main beam of a bridge erecting machine according to claim 8, characterized in that: The rear beam (21) has telescopic channels (212) on both sides of one end, which are vertically extended and correspond one-to-one with the columns (232). The two columns (232) extend into the corresponding telescopic channels (212). The corresponding third telescopic drive members are provided in two and are installed in the telescopic channels (212). The two third telescopic drive members are connected to the two columns (232) respectively.

10. A bridge erecting machine, characterized in that: Includes the rear main beam of the bridge erecting machine as described in any one of claims 1 to 9.

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