Rear supporting leg of bridge girder erection machine and construction method of rear supporting leg

Abstract

The invention relates to the technical field of bridge engineering construction equipment, and discloses a bridge girder erection machine rear supporting leg and a construction method thereof.The bridge girder erection machine rear supporting leg comprises a supporting leg frame and a movable frame which form a door type supporting structure, and each supporting leg is composed of an upper supporting leg body and a lower supporting leg body which can slide up and down and are connected in a sleeved mode and fixed through a pin shaft. And a hydraulic oil cylinder is arranged on a bottom beam of the supporting leg frame and a trolley is arranged on a bottom beam of the movable frame. The supporting leg frame and the movable frame alternately achieve supporting and movable auxiliary supporting through stretching and retracting of cylinder rods of the hydraulic oil cylinders and cooperation of the upper supporting legs and the lower supporting legs. The supporting legs and the cross beam are of a box-shaped structure, a triangular inclined strut is arranged in the movable frame, and an oil cylinder cushion pier and a protective sleeve are arranged at the bottom of the hydraulic oil cylinder. The construction method comprises the steps of alternately supporting the hydraulic oil cylinder and the trolley, adjusting the height of the supporting legs, moving the main beam and the like. The problems that a traditional rear supporting leg is insufficient in adaptability, low in efficiency and high in safety risk in large-span bridge construction are solved, efficient and stable supporting and moving are achieved, and construction safety and economical efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering construction equipment, in particular to a rear support leg of a bridge erecting machine and a construction method thereof. BACKGROUND

[0002] With the continuous advancement of urbanization and the deepening of national infrastructure construction, bridges, as key facilities connecting regional traffic and ensuring smooth road network, have shown a steady growth in construction demand. Moreover, bridge structures are gradually developing towards large-span, which puts higher requirements on the performance of bridge construction core equipment: bridge erecting machines. The rear support leg of a bridge erecting machine, as an important component supporting the main beam and assisting the main beam to complete the overpass operation, its structural design and construction method are directly related to the overall progress, quality and safety of bridge construction.

[0003] However, the current traditional rear support leg of a bridge erecting machine and the matching construction method have gradually shown obvious problems of insufficient adaptability when dealing with large-span bridge construction scenarios. The traditional rear support leg mostly adopts a structure form fixedly connected with the main beam, or a simple wheel form. Such design cannot meet the working condition requirements of the large cantilever deflection of the rear part of the main beam in large-span bridge overpass operation. The fixedly connected structure cannot be dynamically adjusted according to the deflection deformation of the main beam, which easily leads to stress concentration at the connection between the support leg and the main beam, not only possibly damaging the main beam structure, but also weakening the support stability of the support leg. The wheel form has certain moving ability, but the support reliability is limited, and when the main beam is deflected by a large cantilever, it is easy to appear uneven stress, even the risk of derailment, directly leading to difficulties in overpass operation.

[0004] At the same time, the traditional rear support leg and construction method are also accompanied by problems of long construction period and low efficiency. Due to the insufficient structural flexibility, the support leg often needs to rely on additional auxiliary equipment for disassembly, displacement and reinstallation during the overpass process, the operation process is complicated, the time-consuming of single operation is long, and it is difficult to match the efficient demand of modern bridge construction. More importantly, the insufficient support stability and complex operation process further increase the construction safety risk coefficient. Both the stress concentration hidden danger of the fixedly connected structure and the derailment risk of the wheel form may cause structural instability, operation accidents and other problems, which cannot meet the core requirements of safety and stability for large-span bridge construction.

[0005] In summary, the traditional rear support leg of a bridge erecting machine and the construction method have been unable to adapt to the complex working conditions of large-span bridge construction, and there are obvious short boards in adaptability, efficiency, safety and economy. Therefore, a more reasonable structure, more convenient operation and more reliable performance of the rear support leg of a bridge erecting machine and the construction method are needed to solve the current technical problems in construction and promote the upgrading and development of bridge engineering construction technology. SUMMARY

[0006] In order to solve the problem that the existing rear support legs of the bridge girder erection machine and the construction method cannot adapt to the complex working conditions of the large-span bridge construction, cannot meet the rear large-cantilever deflection working condition of the large-span bridge hole, and cannot meet the problems of difficult construction, long construction period, high safety risk coefficient and the like, the present application provides a rear support leg of a bridge girder erection machine and a construction method thereof, which are realized through the following technical solutions. The rear support leg of the bridge girder erection machine comprises a support leg frame arranged below the rear part of the main girder and a moving frame connected with the support leg frame, and is used for forming a rear support for the bridge girder erection machine. The support leg frame and the moving frame each comprise two support legs extending in the vertical direction and two transversely arranged transverse connecting beams respectively connected with the top and bottom of the two support legs, and respectively form a portal support structure perpendicular and parallel to the extension direction of the main girder. Each of the support legs comprises an upper support leg and a lower support leg, the upper support leg and the lower support leg are sleeved and slidingly connected, and are fixed through a pin shaft and a fixing hole arranged on the upper support leg and the lower support leg. The upper support leg of the support leg frame is a first upper support leg, the lower support leg is a first lower support leg, the top transverse beam is a first upper transverse beam, the bottom transverse beam is a first lower transverse beam, the upper support leg of the moving frame is a second upper support leg, the lower support leg is a second lower support leg, the top transverse beam is a second upper transverse beam, and the bottom transverse beam is a second lower transverse beam. The first lower transverse beam is provided with a hydraulic oil cylinder at both ends, the hydraulic oil cylinder is in contact with the bottom support to form a support for the main girder, the second lower transverse beam is provided with a trolley at both ends, the trolley can move with the main girder, and the support leg frame and the moving frame are switched between the support state and the moving state through the extension and retraction of the hydraulic oil cylinder.

[0007] Further, the two first upper support legs are respectively fixedly connected with the main girder through fixing devices, and the first upper transverse beam and the second upper transverse beam are detachably connected through flanges and bolts, so that the support leg frame and the moving frame are connected and fixed.

[0008] Further, the first upper support leg and the first upper transverse beam are detachably connected through flanges and bolts, the first lower support leg and the first lower transverse beam are detachably connected through flanges and bolts, the second upper support leg and the second upper transverse beam are detachably connected through flanges and bolts, and the second lower support leg and the second lower transverse beam are detachably connected through flanges and bolts.

[0009] Further, the hydraulic oil cylinder is provided with an oil cylinder pad at the bottom, which is used for providing stability and protection when being in contact with the bottom support, and the bottom of the hydraulic oil cylinder is further sleeved with a protective sleeve for protecting the ejected cylinder rod.

[0010] Further, the trolley is a passive trolley without power drive, and a track is arranged on the bottom support and slidably connected with the trolley, so that the trolley can move along the track with the main beam.

[0011] Further, the leg and the cross beam are both box-shaped structures.

[0012] Further, the moving frame is further provided with a triangular bracing connecting the second upper cross beam and the two second upper legs on the two sides.

[0013] Further, the first upper leg and the first lower leg are both provided with two rows of parallel and uniformly arranged fixing holes matched with the pin shafts in the vertical direction, and the second upper leg and the second lower leg are both provided with one row of uniformly arranged fixing holes matched with the pin shafts in the vertical direction.

[0014] Further, the pin shafts and the fixing holes are used simultaneously for fixing the upper and lower rows to prevent the leg connection from shaking.

[0015] The construction method of the rear leg of the bridge erecting machine according to the above technical solution comprises the following steps: S1, the main beam is in a state of being supported, the rear leg of the bridge erecting machine is fixedly installed at the bottom of the main beam, the cylinder rod of the hydraulic cylinder is extended to contact the bottom support, thereby forming the main support for the main beam, and the trolley forms the auxiliary support for the main beam; S2, the pin shaft between the first upper leg and the first lower leg is removed, the cylinder rod of the hydraulic cylinder is continuously extended, the first lower cross beam is moved and the first lower leg is moved upward in the vertical direction; S3, the first lower leg is moved to a suitable height, the first upper leg and the first lower leg are fixed through the pin shaft and the fixing hole, the cylinder rod of the hydraulic cylinder is retracted, the hydraulic cylinder is in a state of being off the ground, the trolley supports and moves with the main beam; S4, the hydraulic cylinder is moved to a specified position, the cylinder rod of the hydraulic cylinder is extended to contact the bottom support, the pin shaft between the first upper leg and the first lower leg is removed, the cylinder rod of the hydraulic cylinder is retracted, the first lower cross beam is moved and the first lower leg is moved downward in the vertical direction, the first upper leg and the first lower leg are fixed through the pin shaft when the moving frame is moved to a suitable position, so that the leg frame forms the main support for the main beam and the moving frame forms the auxiliary support for the main beam. S5, remove the pin shaft between the second upper support leg and the second lower support leg, continue to retract the cylinder rod of the hydraulic cylinder, adjust the second upper support leg to move downward in the vertical direction, fix the second upper support leg and the second lower support leg through the pin shaft, and eject the support to the specified height through the cylinder rod of the hydraulic cylinder, so that the trolley is in the off-ground state, and the hydraulic cylinder supports the main beam; S6, place the trolley on the bottom support through the extension and retraction adjustment of the cylinder rod of the hydraulic cylinder, and repeat the steps S1-S5 to realize the support and movement of the rear support legs of the bridge erecting machine.

[0016] Thanks to the above technical solutions, the technical progress achieved by the present application has the following aspects: I. The beneficial effects of the rear support legs of the bridge erecting machine 1. The portal combined structure of the support leg frame and the moving frame is adopted, the upper / lower support legs are connected in a sleeved manner, a plurality of pin shaft fixing holes are arranged, the hydraulic cylinder, the trolley are cooperatively designed, the support height can be dynamically adjusted according to the large cantilever deflection condition of the main beam, the two rows of pin shaft holes of the support leg frame are used to realize the precise height adjustment in the vertical direction, the stress concentration problem of the traditional fixed connection structure is avoided, and the adaptability of the support system to the deformation of the main beam is improved.

[0017] 2. The hydraulic cylinder is provided with an oil cylinder pad and a protective sleeve, and the track cooperates with the passive trolley to form a main support and an auxiliary support alternating working mode; the hydraulic cylinder provides rigid support during support, and the trolley slides along the track during movement, so that the defects of uneven stress and easy derailment of the traditional wheel hanging structure are solved, and the stability and safety of the hole passing operation are ensured. 3. The support leg frame and the moving frame are connected through flange bolts, the upper / lower cross beams and the support legs are detachable structures, the box section support leg and the triangular diagonal brace enhance the overall rigidity, compared with the traditional fixed support leg, the disassembly and assembly efficiency is improved, the structural adjustment demand of different span bridge construction can be quickly adapted, and the equipment transportation and debugging cost is significantly reduced.

[0018] II. The beneficial effects of the construction method 1. The standardized circulation process S1-S6 of the hydraulic cylinder ejection support-pin shaft disassembly height adjustment leg adjustment-oil cylinder retraction trolley movement-oil cylinder reset is used, the overall disassembly and displacement of the support leg do not need to rely on additional auxiliary equipment, the single hole passing operation time is shortened, the complex support leg reinstallation process in the traditional method is avoided, and the efficiency and mechanization of the construction process are realized.

[0019] 2. The precise extension and retraction of the hydraulic cylinder are used in cooperation with the upward and downward sliding of the support leg to reduce the accurate adjustment height, the support leg frame is fixed synchronously through the two rows of pin shaft holes, and the moving frame is quickly positioned through the single pin shaft, so that the height consistency during the support conversion is ensured, the elevation control problem during the hole passing of the large span bridge is solved, and the main beam butt joint accuracy is improved.

[0020] 3. In the supported state, the hydraulic cylinder and the trolley form a double safety barrier, with the main support bearing the load and the auxiliary support preventing overturning. In the moving state, the track guiding system avoids the risk of the trolley derailing. Compared with the traditional roller structure, the construction safety factor is improved. At the same time, the protective sleeve provides full-stroke protection for the exposed part of the hydraulic cylinder rod, reducing dust and debris corrosion and extending the service life of the equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments 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.

[0022] Fig. 1 This is a schematic diagram of the main structure of the present invention; Fig. 2 This is a schematic diagram of the right-side structure of the present invention; Fig. 3 This is a top view of the structure of the present invention; Explanation of reference numerals in the attached figures: 1-Main beam, 101-Fixing device, 2-Outrigger frame, 201-First upper outrigger, 202-First lower outrigger, 203-First upper crossbeam, 204-First lower crossbeam, 205-Hydraulic cylinder, 206-Cylinder pad, 207-Protective sleeve, 3-Moving frame, 301-Second upper outrigger, 302-Second lower outrigger, 303-Second upper crossbeam, 304-Second lower crossbeam, 305-Trolley, 306-Railway, 307-Triangular brace, 4-Pin, 5-Fixing hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, in the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art should understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary details.

[0024] This invention provides a rear support leg for a bridge erecting machine and its construction method. The specific structure and method are illustrated in the following embodiments and appendices. Figs. 1-3 For details: Example 1 The rear support leg of the bridge machine comprises a support leg frame 2 arranged below the bottom of the main beam 1 for bottom support, and a moving frame 3 connected with the support leg frame 2 for forming rear support for the bridge machine; the support leg frame 2 and the moving frame 3 each comprise two legs extending in the vertical direction, and two parallel transverse connecting beams respectively connected with the top and bottom of the two legs, thereby respectively forming a portal support structure perpendicular and parallel to the extension direction of the main beam 1, which can uniformly transmit the load of the main beam 1 to the bottom support surface by the symmetrical stress characteristics, avoiding local stress concentration; each leg comprises an upper leg and a lower leg, the upper leg and the lower leg are arranged in a sleeved manner and are in sliding fit, and are fixed by a pin shaft 4 and a fixed hole 5 arranged on the upper leg and the lower leg, the overall height of the leg can be dynamically changed by sliding adjustment and pin shaft 4 locking to adapt to the height change of the main beam 1 in large-span construction; the upper leg of the support leg frame 2 is a first upper leg 201, the lower leg is a first lower leg 202, the top transverse beam is a first upper transverse beam 203, and the bottom transverse beam is a first lower transverse beam 204; the upper leg of the moving frame 3 is a second upper leg 301, the lower leg is a second lower leg 302, the top transverse beam is a second upper transverse beam 303, and the bottom transverse beam is a second lower transverse beam 304; the first lower transverse beam 204 is provided with a hydraulic oil cylinder 205 at both ends, which can form support for the main beam 1 when in contact with the bottom support; the second lower transverse beam 304 is provided with a trolley 305 at both ends, which can move with the main beam 1; the bottom transverse beams of the support leg frame 2 and the moving frame 3 do not interfere with each other, and through the telescopic adjustment of the cylinder rod of the hydraulic oil cylinder 205 and the cooperation of the upper leg and the lower leg, the support leg frame 2 and the moving frame 3 can be switched between the support state and the moving state, covering the whole construction process of support-adjustment-moving.

[0025] As a preferred embodiment, the two first upper legs 201 are respectively fixedly connected with the main beam 1 through the fixing device 101, the first upper transverse beam 203 and the second upper transverse beam 303 are detachably connected through flanges and bolts, so that the support leg frame 2 and the moving frame 3 are connected and fixed, and the support leg frame 2 and the moving frame 3 are connected together in a cross manner through the second upper transverse beam 303 and the first upper transverse beam 203, which facilitates the disassembly, transportation and maintenance of the moving frame 3, and can flexibly adjust the relative position of the moving frame 3 and the support leg frame 2 according to the bridge span requirement, thereby improving the adaptability of the equipment to different construction scenes.

[0026] As a preferred embodiment, the first upper leg 201 and the first upper cross beam 203 are detachably connected by flanges and bolts, the first lower leg 202 and the first lower cross beam 204 are detachably connected by flanges and bolts, the second upper leg 301 and the second upper cross beam 303 are detachably connected by flanges and bolts, and the second lower leg 302 and the second lower cross beam 304 are detachably connected by flanges and bolts. This design allows the legs and cross beams to be individually machined, transported and replaced, reducing production difficulty and transportation cost. When a component is damaged, only the corresponding component needs to be replaced, without the need to replace the entire support structure, improving the economic efficiency of the equipment.

[0027] As a preferred embodiment, the bottom of the hydraulic cylinder 205 is provided with a cylinder pad 206, which is used to provide stable support when in contact with the bottom support and protect the bottom support surface, avoiding damage to the support surface or uneven stress on the bottom of the hydraulic cylinder 205 caused by direct contact between the hydraulic cylinder 205 and the bottom support. In addition, the bottom of the hydraulic cylinder 205 is also provided with a protective sleeve 207, which is used to protect the ejected cylinder rod from being eroded by dust, gravel, rainwater and other impurities during construction, preventing the cylinder rod from rusting or wearing out, prolonging the service life of the hydraulic cylinder 205 and ensuring the smoothness of its extension and retraction.

[0028] As a preferred embodiment, the trolley 305 is a passive trolley 305 without a power drive device, and the bottom support is provided with a track 306 that slides with the trolley 305. The trolley 305 can move along the track 306 with the main beam 1. The passive trolley 305 without a power drive device has a simple structure and high reliability, without the need for additional drive mechanisms, reducing the complexity and failure rate of the equipment. The track 306 can accurately guide the movement direction of the trolley 305, preventing the trolley 305 from deviating or derailing during movement, ensuring the stability and safety of the main beam 1 movement. In addition, the track 306 can also distribute the pressure of the trolley 305 on the bottom support surface, reducing the risk of deformation of the support surface.

[0029] As a preferred embodiment, the legs and cross beams are box-shaped structures. Compared with other cross-sectional structures such as I-shaped and H-shaped structures, the box-shaped structure has higher bending stiffness, torsional stiffness and carrying capacity under the same material consumption, can effectively withstand the vertical and horizontal loads transmitted by the main beam 1, avoid bending, deformation or fracture of the legs or cross beams during construction, ensure the overall stability of the support system, and meet the high strength requirements of large-span bridge construction on support structures.

[0030] As a preferred embodiment, the mobile frame 3 is further provided with a triangular bracing 307 connecting the second upper cross beam 303 and the two second upper supporting legs 301 on both sides, which can effectively resist the lateral force generated during the movement of the main beam 1, reduce the lateral deformation of the mobile frame 3, avoid instability caused by excessive lateral force, further improve the structural strength and support reliability of the mobile frame 3, and ensure that it always remains in a stable state during auxiliary support and movement.

[0031] As a preferred embodiment, the first upper supporting leg 201 and the first lower supporting leg 202 are both provided with two rows of parallel and uniformly arranged fixing holes 5 adapted to the pin shaft 4 in the vertical direction, and the second upper supporting leg 301 and the second lower supporting leg 302 are both provided with one row of uniformly arranged fixing holes 5 adapted to the pin shaft 4 in the vertical direction, the supporting leg frame 2 as the main supporting component needs to be precisely adjusted in height according to the slight changes in the cantilever deflection of the main beam 1, and the two rows of parallel fixing holes 5 can provide a more precise height adjustment gradient to meet the adaptation requirements of different degrees of deflection, while the mobile frame 3 as the auxiliary supporting and moving component can meet the basic height adjustment requirements, simplify the structure, and reduce the operation complexity while ensuring the function.

[0032] As a preferred embodiment, the pin shaft 4 is used in cooperation with the fixing hole 5 to fix the upper and lower rows at the same time to prevent the supporting leg connection from shaking, and this pin shaft 4 fixing method can ensure the coaxiality of the upper and lower supporting leg connections, avoid the offset or loosening of the upper and lower supporting leg connections, ensure the perpendicularity and stability of the supporting leg as a whole, and enable the connection force of the upper and lower supporting legs to be more uniform through the fixation of adjacent hole positions, thereby avoiding the damage of the pin shaft 4 or the hole position caused by the stress concentration of a certain hole position, prolonging the service life of the supporting leg, and ensuring the reliability of the supporting structure.

[0033] The construction method of the rear supporting leg of the bridge erecting machine comprises the following steps: S1, the main beam 1 is in a state of waiting for support, the rear supporting leg of the bridge erecting machine is fixed and installed at the bottom of the main beam 1, the hydraulic system is started to make the cylinder rod of the hydraulic oil cylinder 205 protrude, the hydraulic oil cylinder 205 is in contact with the bottom support to form the main support for the main beam 1, and the position of the trolley 305 is adjusted to make the trolley 305 in contact with the bottom support or the track 306 to form auxiliary support for the main beam 1, so that the stability of the main beam 1 in the initial state is ensured through the double support of the main support and the auxiliary support, and the inclination or shaking of the main beam 1 is avoided; S2, when the height of the support leg needs to be adjusted to adapt to the state of the main beam 1 or prepare for movement, remove the pin shaft 4 between the first upper support leg 201 and the first lower support leg 202, adjust by extending and retracting the cylinder rod of the hydraulic oil cylinder 205, use the movement of the first lower cross beam 204 to drive the first lower support leg 202 to move upward in the vertical direction, realize flexible adjustment of the height of the support leg, and meet the needs of different construction conditions; S3, when the first lower support leg 202 moves to the appropriate height, fix the first upper support leg 201 and the first lower support leg 202 through the pin shaft 4 and the fixed hole 5 to prevent the lower support leg from sliding, then retract the cylinder rod of the hydraulic oil cylinder 205 to make the hydraulic oil cylinder 205 in the off-ground state, at this time the trolley 305 supports the main beam 1 and moves with the main beam 1, realizing the moving function of the main beam 1; S4, when the main beam 1 moves to the designated position, control the cylinder rod of the hydraulic oil cylinder 205 to be ejected and contact with the bottom support, re-form the preliminary support, then remove the pin shaft 4 between the first upper support leg 201 and the first lower support leg 202, adjust the fixed position by extending and retracting the cylinder rod of the hydraulic oil cylinder 205, retract the cylinder rod of the hydraulic oil cylinder 205 to make the first lower cross beam 204 move and drive the first lower support leg 202 to move downward in the vertical direction, move to the appropriate position, then fix the first upper support leg 201 and the first lower support leg 202 through the pin shaft 4, and then support the main beam 1 through the hydraulic oil cylinder 205, so that the support leg frame 2 forms the main support for the main beam 1 and the moving frame 3 forms the auxiliary support for the main beam 1, completing the support reset after the main beam 1 moves; S5, when the height of the moving frame 3 needs to be adjusted to adapt to the construction needs, remove the pin shaft 4 between the second upper support leg 301 and the second lower support leg 302, adjust the overall height by extending and retracting the hydraulic oil cylinder 205, make the second upper support leg 301 move downward in the vertical direction, then fix the second upper support leg 301 and the second lower support leg 302 through the pin shaft 4, and then adjust the support to the designated height by ejecting the cylinder rod of the hydraulic oil cylinder 205, so that the trolley 305 is in the off-ground state, at this time the hydraulic oil cylinder 205 supports the main beam 1, meeting the support and height adjustment needs in specific working conditions; S6, when the trolley 305 needs to be re-enabled for auxiliary support or prepare for the next movement, place the trolley 305 on the bottom support by extending and retracting the cylinder rod of the hydraulic oil cylinder 205, restore the auxiliary support function of the trolley 305, then repeat the operations of steps S1-S5 to make the rear support legs of the bridge girder machine realize the support and movement in a cycle and meet the adjustment needs of different heights, completing the main beam 1 hole passing and other operations in the construction of long-span bridges.

[0034] As a preferred embodiment, in step S1, the fixing device 101 connecting the top of the first upper support leg 201 with the main beam 1 adopts the form of high-strength bolts, which can provide reliable detachable connection, facilitate the disassembly and maintenance of the equipment in the later stage, ensure that there is no relative displacement between the first upper support leg 201 and the main beam 1, and avoid the security risks caused by connection loosening during the supporting process; in steps S2 and S4, the extension and retraction of the cylinder rod of the hydraulic oil cylinder 205 adopts a synchronous control mode, which ensures that the extension and retraction amounts of the hydraulic oil cylinders 205 on both sides of the support leg frame 2 are consistent through the synchronous valve or electro-hydraulic proportional control of the hydraulic system, avoids the inclination of the support leg frame 2 caused by the asynchronous extension and retraction of the oil cylinders on both sides, and further causes the inclination or instability of the main beam 1; during the movement of the main beam 1 in step S3, the cooperation gap between the trolley 305 and the track 306 is monitored in real time through the displacement sensor, so as to ensure that the gap is always within the preset safe range, and at the same time, the levelness of the main beam 1 is monitored in real time through the level meter, and the movement is immediately paused and adjusted when the deviation of the levelness exceeds the threshold value, so as to ensure the stability and safety of the main beam 1 during the movement, and further improve the construction reliability.

[0035] The present application effectively solves the problems of insufficient adaptability, low efficiency and high safety risk of the traditional rear support leg in the construction of large-span bridges through the above-mentioned structural design and construction method. Through the alternating support and movement of the support leg frame 2 and the moving frame 3, combined with the height adjustment of the sleeve joint type support leg, the high-strength support of the box structure, the lateral stability of the triangular diagonal brace 307, and the cooperative work of the hydraulic oil cylinder 205 and the trolley 305, efficient and stable support and movement are realized, the construction safety and economy are improved, and the features of each preferred embodiment are mutually matched and cooperated, further optimizing the equipment performance, ensuring reliable application in different large-span bridge construction scenes, and having good implementability and popularization value.

[0036] In this patent application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment, without more limitation, the statement "including a limited element" does not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0037] The above examples are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing examples, those ordinarily skilled in the art should understand: the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A rear support leg for a bridge erecting machine, characterized in that, It includes a leg frame (2) located below the rear of the main beam (1) and a movable frame (3) connected to the leg frame (2) for providing rear support for the bridge erecting machine; Both the leg frame (2) and the movable frame (3) include two legs extending in a vertical direction and two parallel transverse connecting beams that connect the top and bottom of the two legs respectively, and respectively form a portal support structure that is perpendicular and parallel to the extension direction of the main beam (1). Each of the legs includes an upper leg and a lower leg, which are sleeved and slidably fitted together, and are fixed by a pin (4) to a fixing hole (5) provided on the upper leg and the lower leg; The upper support leg of the support frame (2) is the first upper support leg (201), the lower support leg is the first lower support leg (202), the top crossbeam is the first upper crossbeam (203), and the bottom crossbeam is the first lower crossbeam (204). The upper support leg of the movable frame (3) is the second upper support leg (301), the lower support leg is the second lower support leg (302), the top crossbeam is the second upper crossbeam (303), and the bottom crossbeam is the second lower crossbeam (304). The first lower crossbeam (204) is provided with hydraulic cylinders (205) at both ends. The hydraulic cylinders (205) contact the bottom support to support the main beam (1). The second lower crossbeam (304) is provided with trolleys (305) at both ends. The trolleys (305) can move with the main beam (1). The extension and retraction of the hydraulic cylinders (205) causes the support frame (2) and the moving frame (3) to work alternately between the support state and the moving state.

2. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The tops of the two first upper legs (201) are fixedly connected to the main beam (1) by fixing devices (101), and the first upper crossbeam (203) and the second upper crossbeam (303) are detachably connected by flanges and bolts, so that the leg frame (2) and the movable frame (3) are connected and fixed.

3. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The first upper support leg (201) and the first upper crossbeam (203) are detachably connected by flanges and bolts. The first lower support leg (202) and the first lower crossbeam (204) are detachably connected by flanges and bolts. The second upper support leg (301) and the second upper crossbeam (303) are detachably connected by flanges and bolts. The second lower support leg (302) and the second lower crossbeam (304) are detachably connected by flanges and bolts.

4. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The bottom of the hydraulic cylinder (205) is provided with a cylinder pad (206) to provide stability and protection when in contact with the bottom support. The bottom of the hydraulic cylinder (205) is also covered with a protective sleeve (207) to protect the ejected cylinder rod.

5. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The trolley (305) is a passive trolley (305) without a power drive device, and the bottom support is provided with a track (306) that slides with the trolley (305). The trolley (305) can move along the track (306) with the main beam (1).

6. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, Both the support legs and the crossbeams are box-shaped structures.

7. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The movable frame (3) is also provided with a triangular brace (307), which connects the second upper crossbeam (303) and the two second upper legs (301) on both sides.

8. The rear support leg of a bridge erecting machine according to claim 1, characterized in that, The first upper support leg (201) and the first lower support leg (202) are each provided with two rows of parallel and evenly arranged fixing holes (5) that are adapted to the pin (4) in the vertical direction. The second upper support leg (301) and the second lower support leg (302) are each provided with one row of evenly arranged fixing holes (5) that are adapted to the pin (4) in the vertical direction.

9. A rear support leg for a bridge erecting machine according to claim 8, characterized in that, When the pin (4) is used in conjunction with the fixing hole (5), it fixes both the upper and lower rows simultaneously to prevent the support leg connection from shaking.

10. The construction method for the rear support leg of the bridge erecting machine according to any one of claims 1-9, characterized in that, Includes the following steps: S1. The main beam (1) is in a state of waiting to be supported. The rear support leg of the bridge erecting machine is fixedly installed at the bottom of the main beam (1). The cylinder rod of the hydraulic cylinder (205) is pushed out and contacts the bottom support to form the main support for the main beam (1). At the same time, the trolley (305) forms an auxiliary support for the main beam (1). S2. Remove the pin (4) between the first upper support leg (201) and the first lower support leg (202), and the cylinder rod of the hydraulic cylinder (205) continues to push out, causing the first lower crossbeam (204) to move and drive the first lower support leg (202) to move upward in the vertical direction; S3. The first lower support leg (202) moves to a suitable height, and the first upper support leg (201) and the first lower support leg (202) are fixed by the pin (4) and the fixing hole (5). The cylinder rod of the hydraulic cylinder (205) is retracted, the hydraulic cylinder (205) is in the off-ground state, and the trolley (305) supports the main beam (1) and moves with the main beam (1). S4. Move to the designated position, the cylinder rod of the hydraulic cylinder (205) pushes out and contacts the bottom support, remove the pin (4) between the first upper support leg (201) and the first lower support leg (202), retract the cylinder rod of the hydraulic cylinder (205), so that the first lower crossbeam (204) moves and drives the first lower support leg (202) to move downward in the vertical direction. Move to a suitable position and then fix the first upper support leg (201) and the first lower support leg (202) through the pin (4), so that the support leg frame (2) forms the main support for the main beam (1) and the moving frame (3) forms the auxiliary support for the main beam (1); S5. Remove the pin (4) between the second upper support leg (301) and the second lower support leg (302), continue to retract the cylinder rod of the hydraulic cylinder (205) to adjust, so that the second upper support leg (301) moves downward in the vertical direction, and then fix the second upper support leg (301) and the second lower support leg (302) through the pin (4), and adjust the support to the specified height by pushing out the cylinder rod of the hydraulic cylinder (205). The trolley (305) is in the state of being off the ground, and the hydraulic cylinder (205) supports the main beam (1). S6. By adjusting the extension and retraction of the cylinder rod of the hydraulic cylinder (205), the trolley (305) is placed on the bottom support. Steps S1-S5 can be repeated to enable the rear outriggers of the bridge erecting machine to support and move.

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