Compatible multi-hole cross combination adaptive segmental beam bridge machine and construction method thereof

Abstract

This invention discloses an adaptive segmental beam bridge erecting machine compatible with multi-span combinations and its construction method. The bridge erecting machine includes: a main beam, comprising: two truss beams and two end cross braces; the truss beams have a triangular cross-section, including connecting sections at both ends and several standard sections between the two connecting sections; a longitudinal track is fixedly provided at the upper end of the truss beam along its length; front and rear support legs are detachably located at the bottom ends of the main beam; a middle support leg is located at the bottom end of the main beam and between the front and rear support legs; there are at least four middle support legs, used to support the main beam and / or drive the main beam to travel along the construction direction; two overhead cranes and two auxiliary cranes are all located at the upper end of the main beam via the longitudinal track and can move back and forth along the construction direction; the two overhead cranes are located between the two auxiliary cranes to collaboratively complete the hoisting of multiple segmental beam blocks. The bridge erecting machine of this invention can achieve adaptive and seamless switching of various complex span combinations.

Description

Technical Field

[0001] This invention belongs to the field of bridge erection machine technology, and more specifically, relates to an adaptive segmental beam bridge erection machine compatible with multi-span combinations and its construction method. Background Technology

[0002] As the construction of high-speed railways, intercity rail transit, and high-grade highways gradually extends into complex geographical environments such as mountainous areas and cross rivers and seas, bridge structures are becoming increasingly diverse under these complex conditions. To cross existing roads, rivers, or deep valleys, large-span precast segmental beams are frequently used in the design. The construction of such bridges not only places stringent requirements on the safety and stability of the erection equipment but also presents new challenges to the equipment's versatility and conversion efficiency across different spans. Therefore, developing bridge erection equipment that combines high load-bearing capacity with a wide range of span variations has become an important research direction in the field of bridge construction technology.

[0003] In existing precast segmental beam bridge construction, the segmental assembly method is mainly adopted, and the supporting construction equipment is generally a segmental assembly bridge erecting machine. Traditional segmental beam bridge erecting machines are mostly designed based on standardized or limited-range applicability principles. Their standard operating procedure is typically as follows: the bridge erecting machine is anchored to the pier or an already erected beam segment using a support system; the main truss cantilever extends to the next pier; then, a crane lifts the precast segmental beams transported by a beam transport vehicle piece by piece, completing the bonding, tensioning, and prestressing construction in mid-air, ultimately forming the entire span bridge. Current mature technologies mainly focus on standard spans of 30 to 40 meters. These bridge erecting machines have relatively compact structures, clear stress models, and can efficiently complete the erection of simply supported beams or continuous beams of equal span. While some improved bridge erecting machines possess a certain span variation capability, adapting to span changes by adjusting the longitudinal position of the outriggers on the main truss or adding segmental splicing to the main truss, their adjustment range is often very limited, mainly used to address pier position deviations or chord length changes in curved bridges. When facing construction scenarios with a standard span (below 40 meters), the existing technology system is relatively mature and can ensure the continuity and safety of construction.

[0004] Although existing bridge erecting machine technology is widely used in standard span construction, its limitations and technical defects are exposed when facing increasingly complex medium-to-large span and multi-span combinations of 40 to 70 meters, severely restricting construction efficiency and economic benefits. For example, traditional bridge erecting machines are structurally optimized for specific spans (such as 32 meters or 40 meters). When large-span variable cross-section continuous beams of 40 to 70 meters appear in the construction route (such as the common 45+50+45 meter span combination), the structural stiffness, strength, and stability of the original equipment cannot meet the requirements. If a small-span bridge erecting machine is forcibly used for large-span operations, the main truss will experience excessive deflection and deformation, and may even face the risk of instability. On the other hand, if a dedicated large bridge erecting machine is designed for the maximum span of 70 meters, when it returns... When erecting a 40-meter span, the massive weight of the equipment not only increases construction costs but may also exceed the bearing capacity of the 40-meter span piers or beams, making the project impossible to implement. In addition, existing variable span bridge erecting machines often require the assistance of large crawler cranes to disassemble the main truss, add or remove truss segments, and rearrange the outrigger positions and hydraulic pipelines when adjusting the span. This process is similar to a "secondary reassembly" of the equipment, which is not only time-consuming and labor-intensive, but also significantly increases the risk of high-altitude operations during frequent disassembly and assembly, making it extremely easy to cause safety accidents. For continuously changing span combinations such as 45+50+45 meters, it is completely unacceptable in actual engineering if a large-scale equipment modification is required for each span erected. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides an adaptive segmental beam bridge erecting machine and its construction method compatible with multi-span combinations. Through the coordinated operation of a specially designed ultra-long triangular truss main beam and at least four central support legs, it overcomes the limitations of traditional equipment requiring cumbersome disassembly and assembly for span changes, achieving adaptive and seamless switching between various complex span combinations within a wide range of 40m to 70m. This not only greatly simplifies the span change process, shortens the construction cycle, and reduces safety risks while ensuring high rigidity and structural stability during large-span operations, but also significantly improves the assembly accuracy and operational efficiency of multiple segmental beams through the coordinated operation of the main and auxiliary cranes, thus combining excellent adaptability to working conditions, construction safety, and engineering economy.

[0006] To achieve the above objectives, the first aspect of the present invention provides an adaptive segmental beam bridge erecting machine compatible with multi-span combinations, comprising: a main beam, a front leg, a middle leg, a rear leg, a crane, and an auxiliary crane.

[0007] The main beam has a frame structure, comprising: two truss beams and two end cross braces; the truss beams have a triangular cross-section, including connecting sections at both ends and several standard sections between the two connecting sections; the connecting sections and the standard sections, as well as the standard sections themselves, are detachably connected by bolts; one end cross brace is detachably connected to the connecting sections at the same end of both truss beams by bolts; the total length of the main beam is 175m to 190m, and the number of standard sections on a single truss beam does not exceed 15; a longitudinal track is fixedly provided at the upper end of the truss beam along its length.

[0008] The front support leg and the rear support leg are detachably mounted at both ends of the bottom of the main beam.

[0009] The middle support leg is located at the bottom end of the main beam and between the front support leg and the rear support leg; the number of the middle support legs is at least four, used to support the main beam and / or drive the main beam to travel along the construction direction;

[0010] The two overhead cranes and the two auxiliary overhead cranes are all mounted on the upper end of the main beam via the longitudinal transfer track and can move back and forth along the construction direction; the two overhead cranes are positioned between the two auxiliary overhead cranes to work together to complete the hoisting of multiple beam segments.

[0011] Furthermore, the truss beam also includes: an upper chord, a lower chord, web members, cross members, and a sliding track;

[0012] One top chord and two bottom chords are arranged in an isosceles triangle;

[0013] The longitudinal track is fixedly installed at the middle of the upper end of the upper chord;

[0014] The two ends of the web member are respectively hinged to the upper chord and the lower chord;

[0015] Two lower chords are fixed at both ends of the crossbar; a plurality of crossbars are arranged at equal intervals along the length of the truss beam, wherein multiple non-adjacent crossbars are fixedly connected to corresponding groups of diagonal braces; each group of diagonal braces is arranged in an X-shape, with one end connected to the middle of the crossbar and the other end connected to the lower chord.

[0016] The sliding track is fixedly installed at the bottom center of several crossbars along the length of the truss beam, and is used to connect with the middle support leg to realize the travel and movement of the main beam.

[0017] Furthermore, within one of the connecting sections or the standard sections, two adjacent web members are arranged in an inverted V-shape and form a stable triangular support unit with the connected upper chord or lower chord; at the same time, between the two inverted V-shaped web members at the critical structural stress position of the truss beam, a web member located in the vertical plane is also added.

[0018] Furthermore, the upper chord and the lower chord are I-beams welded from Q355B steel plates; the web members are hollow tubular members.

[0019] Furthermore, the front outrigger includes: an upper truss, a first inner sleeve, a first outer sleeve, a support column, a first hinge seat, and a first hydraulic cylinder;

[0020] Several first hinge seats are fixedly provided at the upper end of the upper truss;

[0021] The first hinge seat is detachably connected to the lower chord by bolts;

[0022] The two first inner sleeves are fixed to both ends of the bottom of the upper truss by screw connection;

[0023] The first outer sleeve corresponds one-to-one with the first inner sleeve;

[0024] The first outer sleeve is movably fitted around the outer periphery of the first inner sleeve, and the first outer sleeve and the first inner sleeve are detachably connected by a pin structure that passes through both.

[0025] A connecting crossbar is fixedly provided between the two first outer sleeves;

[0026] Two first hydraulic cylinders are symmetrically arranged on the same side of the upper truss, and their movable ends are connected to the connecting crossbar. This allows the relative position of the first outer sleeve and the first inner sleeve to be adjusted by synchronously adjusting the extension and retraction of the movable ends of the two first hydraulic cylinders, thereby adjusting the overall height of the front outrigger.

[0027] One end of the supporting column is connected to the bottom end of the first outer sleeve, and the other end is connected to a temporary support or bridge pier.

[0028] Furthermore, the front support leg also includes: at least two first longitudinal movement mechanisms; the first longitudinal movement mechanisms are located at the upper end of the upper truss; the first longitudinal movement mechanisms are provided with pulleys and reducers that drive the pulleys to rotate; the two first longitudinal movement mechanisms are in rolling cooperation with the sliding tracks on the two truss beams respectively through the pulleys, so that the front support leg can move and change span at the front end of the main beam through the drive motor.

[0029] Furthermore, the middle support leg includes: a second hinge seat, a second longitudinal movement mechanism, a shifting trolley, a middle support leg cross brace, a transverse movement mechanism, a first support beam, and a lifting mechanism;

[0030] One end of the lifting mechanism is connected to the upper end of the segmental beam or temporary support, and the other end is connected to the bottom end of the first support beam; there are at least four lifting mechanisms, which are configured to adjust the overall height of the middle support leg by hydraulic drive.

[0031] The two aforementioned transfer trolleys are detachably mounted on the upper end of the first support beam;

[0032] The two ends of the middle support leg are respectively connected to the two transfer trolleys;

[0033] The four second hinge seats are detachably connected to the bottom end of the corresponding lower chord;

[0034] One of the aforementioned transfer trolleys is connected to the bottom ends of two corresponding second hinge seats;

[0035] The second longitudinal movement mechanism is located at the middle of the upper end of the displacement trolley, and its upper end is connected to the sliding track, which is used to drive the main beam to move along the construction direction;

[0036] Two sets of the lateral movement mechanisms are arranged in a mirror-symmetrical manner on the upper end of the first support beam; each set of the lateral movement mechanism includes a hydraulic cylinder, and the movable end of the hydraulic cylinder is connected to the corresponding side of the displacement trolley; the two sets of the lateral movement mechanisms are configured to keep the stroke length of their movable ends equal and opposite in direction during the movement, so as to work together to drive the main beam to move smoothly in the lateral direction.

[0037] Furthermore, the rear outrigger includes: a third hinge seat, a second outer sleeve, a second inner sleeve, a rear outrigger cross brace, a second hydraulic cylinder, a second support beam, and an adjusting support;

[0038] The two aforementioned adjusting supports are movably mounted on the segmental beam block or temporary support, with their upper ends connected to the bottom end of the second supporting beam; the two aforementioned adjusting supports are configured to collaboratively adjust the second supporting beam to a horizontal position;

[0039] The upper end of the second outer sleeve is connected to the lower chord via the third hinge.

[0040] The upper end of the second inner sleeve passes through the bottom end of the second outer sleeve and is inserted into the second outer sleeve; the second inner sleeve and the second outer sleeve are detachably connected by a pin structure that passes through both.

[0041] The two ends of the rear support leg cross brace are respectively connected to two second outer sleeves;

[0042] The fixed end of the second hydraulic cylinder is located on the cross brace of the rear outrigger, and its movable end is connected to the second support beam located below it.

[0043] Two sets of adjustment structures, each consisting of two second outer sleeves, two second inner sleeves, one rear outrigger cross brace, and one second hydraulic cylinder, are mirror-symmetrical about the axis of the second support beam. The adjustment structures are configured to adjust the overall height of the rear outrigger by synchronously adjusting the extension and retraction of the movable ends of the two second hydraulic cylinders.

[0044] A second aspect of this invention provides a construction method for an adaptive segmental beam bridge erection machine compatible with multi-span combinations, applied to the bridge erection machine described above, including a method for the bridge erection machine to pass through spans, the specific steps of which are as follows:

[0045] S1: Release the anchorage connection between the front outrigger and the temporary support or pier; raise the bottom height of the rear outrigger and lift it off the ground; release the anchorage connection between the middle outrigger located at the rear end of the main beam and the segmental beam block, and release the anchorage connection between the other three middle outriggers and the lower chord.

[0046] S2: Drive the main beam to move along the construction direction through the second longitudinal movement mechanism on the three middle support legs and complete the first forward movement through the hole, and support the front support leg on the first temporary support next to the first pier, and reserve a middle support leg installation position on the first temporary support;

[0047] S3: Using a crane, the middle support leg located at the rear end of the main beam is lifted to the reserved installation position on the first temporary support, and the middle support leg is anchored to the first temporary support.

[0048] S4: Repeat steps S1 to S3, and drive the main beam to complete the second and third through holes in sequence by using the three middle support legs located in the middle and front of the main beam;

[0049] S5: Using two overhead cranes, a section of beam is hoisted onto the second and third piers and anchored. Then, using two overhead cranes, a section of beam is hoisted onto the first and third piers and anchored.

[0050] S6: Release the anchorage of the first temporary support and the second temporary support to the corresponding middle support leg, and use two overhead cranes to lift the two middle support legs onto the segment beam blocks of the adjacent pier for support, and anchor the middle support legs to the segment beam blocks.

[0051] S7: The crane hoisted one of the middle supports located at the rear end of the main beam to the segmental beam block of the third pier, and anchored the middle support to the segmental beam block; then, the four middle supports were anchored to the main beam above them, and the height of the bottom end of the rear support was adjusted to support the segmental beam.

[0052] Furthermore, the bridge erection machine's beam erection method includes the following steps:

[0053] S10: The heightened sections on the first temporary support and the second temporary support are removed by the two overhead cranes respectively;

[0054] S20: The two overhead cranes respectively lift a segment of beam to the vicinity of the second pier and glue it together with the segment of beam at the upper end of the second pier; then, the two segment of beam is supported by the suspension assembly to release the two overhead cranes, and the multiple segment of beam is prestressed and installed.

[0055] S30: Repeat step S20, and use the two overhead cranes to cyclically suspend and assemble the segmental beam blocks on both sides of the segmental beam on the first pier and the second pier.

[0056] S40: Using one of the aforementioned overhead cranes, multiple segmental beam blocks are hoisted sequentially to complete the erection of the sections between the spanned pier and the first pier, and between the second pier and the third pier, and to temporarily support these segmental beams using multiple hoisting assemblies; then, the gluing and splicing of these segmental beam blocks are carried out sequentially.

[0057] S50: The mid-span closure segment beam blocks are hoisted into place using one of the aforementioned overhead cranes. At the same time, wet joints are constructed between the segment beam blocks in the side span section, and tensioning and grouting are performed. Afterward, wet joints are constructed between the segment beam blocks in the mid-span section, and tensioning and grouting are performed.

[0058] S60: After the segmental beam reaches a stable state, the wet joint template and the hanging assembly are removed in sequence, and then the bridge erecting machine is unloaded.

[0059] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0060] 1. The bridge erecting machine of the present invention, through the coordinated operation of a specially designed ultra-long triangular truss main beam and at least four central support legs, breaks through the limitation of traditional equipment requiring cumbersome disassembly and assembly for span changes, and achieves adaptive and seamless switching of various complex span combinations within a wide range of 40m to 70m. This not only greatly simplifies the span change process, shortens the construction cycle and reduces safety risks while ensuring high rigidity and structural stability in large-span operations, but also significantly improves the assembly accuracy and work efficiency of multiple segment beams through the coordinated operation of the main and auxiliary cranes, thus possessing excellent adaptability to working conditions, construction safety and engineering economy.

[0061] 2. The bridge erecting machine of the present invention, by setting up a truss beam with a triangular spatial truss structure, takes into account the requirements of strength, stiffness and modular assembly, and provides solid support for adaptive erection of multi-span structures.

[0062] 3. The bridge erecting machine of the present invention significantly improves the adaptability of the bridge erecting machine to different span and elevation conditions by adopting a modular and height-adjustable front support leg. At the same time, the structure takes into account stability, adjustment flexibility and construction convenience, and provides reliable front-end support for multi-span combined erection.

[0063] 4. The bridge erecting machine of the present invention integrates three core functions—lifting, longitudinal travel, and lateral adjustment—into a central support leg. Its components have clear division of labor and work together efficiently, which together achieves precise control of the spatial position of the main beam during the construction of long-span bridges with multiple degrees of freedom, significantly improving the flexibility, accuracy, and overall efficiency of construction. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the bridge erecting machine according to an embodiment of the present invention;

[0065] Figure 2 This is a top view of the main beam in an embodiment of the present invention;

[0066] Figure 3 This is a schematic diagram of the cross-section of the truss beam according to an embodiment of the present invention;

[0067] Figure 4 This is a schematic diagram of the front support leg in an embodiment of the present invention;

[0068] Figure 5 This is a schematic diagram of the support leg in an embodiment of the present invention;

[0069] Figure 6 This is a schematic diagram of the structure of the rear support leg in an embodiment of the present invention;

[0070] Figure 7 This is a schematic diagram of the structure of the overhead crane used to transport the tensioning platform for tensioning operations, according to an embodiment of the present invention.

[0071] Figure 8This is a schematic flowchart of the via method according to an embodiment of the present invention;

[0072] Figures 9-18 This is a process state diagram of the bridge erecting machine during the span operation according to an embodiment of the present invention, with arrows indicating the construction direction;

[0073] Figure 19 This is a schematic diagram of the steps of the beam erection method according to an embodiment of the present invention;

[0074] Figures 20-31 This is a process state diagram of the bridge erecting machine during beam erection operations according to an embodiment of the present invention, with arrows indicating the construction direction.

[0075] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-main beam, 101-truss beam, 101a-upper chord, 101b-lower chord, 101c-web member, 101d-longitudinal track, 101e-crossbar, 101f-sliding track, 102-end cross brace, 2-front support leg, 201-upper truss, 202-first inner sleeve, 203-first outer sleeve, 204-support column, 205-upper cross brace, 206-lower cross brace, 207-first diagonal brace, 208-first hinge seat, 209-first hydraulic cylinder, 210-first longitudinal movement mechanism, 3-middle support leg, 301-second hinge seat 302-Second longitudinal movement mechanism, 303-Transfer trolley, 304-Middle support leg cross brace, 305-Transverse movement mechanism, 306-First support beam, 307-Lifting mechanism, 4-Rear support leg, 401-Third hinge seat, 402-Second outer sleeve, 403-Second inner sleeve, 404-Rear support leg cross brace, 405-Second hydraulic cylinder, 406-Second support beam, 407-Adjusting support, 5-Crane, 6-Auxiliary crane, 7-Tensioning platform, 8-Hanging assembly, 9-First pier, 10-First temporary support, 11-Second pier, 12-Second temporary support, 13-Third pier, 14-Third temporary support. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0077] Example 1, please refer to Figures 1 to 7 This invention provides an adaptive segmental beam bridge erecting machine compatible with multi-span combinations, including: a main beam 1, a front leg 2, a middle leg 3, a rear leg 4, a crane 5, and an auxiliary crane 6.

[0078] The main beam 1 has an overall frame structure, comprising: two truss beams 101 and two end cross braces 102; the truss beam 101 has a triangular cross-section, including connecting sections at both ends and several standard sections between the two connecting sections; the connecting sections and the standard sections, as well as the standard sections themselves, are detachably connected by bolts; one end cross brace 102 is detachably connected to the connecting sections at the same end of both truss beams 101 by bolts; the total length of the main beam 1 is 175m to 190m, and the number of standard sections on one truss beam 101 does not exceed 15; a longitudinal track 101d is fixedly provided at the upper end of the truss beam 101 along its length direction;

[0079] The front support leg 2 and the rear support leg 4 are detachably mounted at both ends of the bottom of the main beam 1.

[0080] The middle support leg 3 is located at the bottom end of the main beam 1 and between the front support leg 2 and the rear support leg 4; there are at least four middle support legs 3, which are used to support the main beam 1 and / or drive the main beam 1 to travel along the construction direction;

[0081] The two overhead cranes 5 and the two auxiliary overhead cranes 6 are all mounted on the upper end of the main beam 1 via the longitudinal transfer track 101d and can move back and forth along the construction direction; the two overhead cranes 5 are positioned between the two auxiliary overhead cranes 6 to work together to complete the hoisting of multiple beam segments.

[0082] Understandably, during use, by setting a main beam 1 with a total length of 175 to 190m and creatively configuring at least four intermediate supports 3, a multi-point support and travel system with high redundancy is constructed. This design of long main beams and multiple supports breaks the dependence of traditional bridge erecting machines on fixed support leg spacing. When facing complex conditions such as variable cross-section continuous beams of 45+50+45m or 70m single-span simply supported beams, there is no need to disassemble and re-anchor the front supports 2, intermediate supports 3, or rear supports 4 using external large lifting equipment. Only the longitudinal movement of the main beam 1 and the alternating support and conversion of intermediate supports 3 at different positions are needed to flexibly adapt to changes in pier spacing. This not only achieves a seamless transition from 40m to 70m spans but also avoids construction delays and safety hazards caused by frequent disassembly and assembly of supports, significantly improving construction efficiency. Secondly, two triangular cross-section truss beams 101 are connected by end cross bracing 102. Combined with the detachable bolted connection between the standard section and the connecting section, this ensures that the main beam 1 has extremely high bending stiffness and torsional stability under cantilevered and suspended conditions, effectively controlling deflection deformation, and also giving the equipment good modular transportation and assembly performance. In addition, by arranging two overhead cranes 5 between two auxiliary cranes 6 and cooperating on the longitudinal track, a set of work clusters with clear functional division of labor is formed. The overhead cranes 5 undertake the main load lifting tasks, while the auxiliary cranes 6 can flexibly cooperate to lift beam accessories (supports, embedded parts), construction tools and materials. This layout facilitates the high-precision docking and assembly of multiple beam segments, especially in large-span, high-altitude operation environments, which can significantly improve the construction quality of segmental beam bonding and tensioning.

[0083] It should be noted that in this embodiment, the crane 5 and the auxiliary crane 6 are both common crane equipment with different load capacities in the prior art. The crane 5 can be used to stably lift segmental beam blocks, and the auxiliary crane 6 can also be used to lift the working platform (tensioning platform 7, which facilitates prestressing construction, getting on and off the bridge erecting machine, etc.) used for auxiliary construction of the bridge erecting machine, as well as the transportation of auxiliary facilities (suspension assembly 8, which is used to firmly clamp or lift segmental beam blocks), auxiliary tools, and small items such as the lower crossbeam during bridge erecting machine construction. In other embodiments, other types of crane equipment can also be used, which are not specifically limited here.

[0084] Furthermore, the truss beam 101 also includes: an upper chord 101a, a lower chord 101b, a web member 101c, a cross member 101e, and a sliding track 101f;

[0085] One upper chord 101a and two lower chords 101b are arranged in an isosceles triangle.

[0086] The longitudinal track 101d is fixedly installed at the middle of the upper end of the upper chord 101a;

[0087] The two ends of the web member 101c are respectively hinged to the upper chord member 101a and the lower chord member 101b;

[0088] Two lower chord members 101b are fixed to both ends of the crossbar 101e; a plurality of crossbars 101e are arranged at equal intervals along the length of the truss beam 101, wherein multiple non-adjacent crossbars 101e are fixedly connected to corresponding groups of diagonal braces; each group of diagonal braces is arranged in an X-shape, with one end connected to the middle of the crossbar 101e and the other end connected to the lower chord member 101b;

[0089] The sliding track 101f is fixedly installed at the bottom center of several crossbars 101e along the length of the truss beam 101, and is used to connect with the middle support leg to realize the travel and movement of the main beam 1.

[0090] Understandably, the above design enables the truss beam 101 to possess excellent mechanical properties and structural stability. The upper chord 101a and two lower chords 101b are arranged in an isosceles triangle, and together with the hinged web members 101c, effectively transfer and distribute the load. The crossbar 101e connects the two lower chords 101b at equal intervals and integrates X-shaped diagonal braces, significantly improving torsional stiffness and lateral stability. The longitudinal track 101d is located at the upper middle of the upper chord 101a, providing a high-precision operating foundation for the crane 5 and auxiliary crane 6. The sliding track 101f is fixed at the bottom middle of the crossbar 101e and reliably connects with the middle support leg 3, enabling smooth and controllable movement of the main beam 1.

[0091] In an optional embodiment, within one of the connecting sections or the standard sections, two adjacent web members 101c are arranged in an inverted V-shape and form a stable triangular support unit with the connected upper chord 101a or lower chord 101b. At the same time, between the two inverted V-shaped web members 101c at the critical structural stress position of the truss beam 101, an additional web member 101c located in the vertical plane is provided to enhance the bearing capacity and structural stiffness of the area, thereby significantly enhancing the compressive and shear bearing capacity and structural stiffness of the area, effectively suppressing local buckling and deformation, and thus ensuring the safety and reliability of the main beam 1 during the multi-condition, large-span erection process.

[0092] In an optional embodiment, the upper chord 101a and the lower chord 101b are I-beams welded from Q355B steel plates; the web member 101c is a hollow tube member. It is understood that during use, the upper chord 101a and the lower chord 101b, constructed from Q355B steel plates, possess high yield strength and good weldability, ensuring the overall load-bearing capacity of the main beam 1 while also considering manufacturability and structural lightweighting. The web member 101c, made from a hollow tube member, not only effectively reduces the self-weight of the truss beam 101, lowering the difficulty of transportation and installation, but also efficiently transmits axial forces and suppresses local instability. Furthermore, the synergistic optimization of the materials and cross-sectional forms of the upper chord 101a, the lower chord 101b, and the web member 101c enables the truss beam 101 to achieve a harmonious balance of structural strength, stiffness, and economy while meeting the high load requirements of multi-span combined construction.

[0093] In an optional embodiment, the clearance between the bottom surface of the lower chord 101b and the designed bridge deck is 5m to 6m to facilitate the transportation of segmental beam blocks on the bridge deck and possible temporary storage.

[0094] Furthermore, the front support leg 2 includes: an upper truss 201, a first inner sleeve 202, a first outer sleeve 203, a support column 204, a first hinge seat 208, and a first hydraulic cylinder 209;

[0095] A plurality of first hinge seats 208 are fixedly provided on the upper end of the upper truss 201;

[0096] The first hinge 208 is detachably connected to the lower chord 101b by bolts.

[0097] The two first inner sleeves 202 are fixed to both ends of the bottom of the upper truss 201 by screw connection;

[0098] The first outer sleeve 203 corresponds one-to-one with the first inner sleeve 202;

[0099] The first outer sleeve 203 is movably sleeved on the outer periphery of the first inner sleeve 202, and the first outer sleeve 203 and the first inner sleeve 202 are detachably connected by a pin structure that passes through both.

[0100] A connecting crossbar is fixedly provided between the two first outer sleeves 203;

[0101] Two first hydraulic cylinders 209 are symmetrically arranged on the same side of the upper truss 201, and their movable ends are connected to the connecting crossbar. This allows the relative position of the first outer sleeve 203 and the first inner sleeve 202 to be adjusted by synchronously adjusting the extension and retraction of the movable ends of the two first hydraulic cylinders 209, thereby adjusting the overall height of the front support leg 2.

[0102] One end of the support column 204 is connected to the bottom end of the first outer sleeve 203, and the other end is connected to the temporary support or pier.

[0103] Understandably, during use, the upper truss 201 is detachably fixed to the lower chord 101b via bolts through the first hinge seat 208, facilitating rapid installation and relocation; the first inner sleeve 202 and the first outer sleeve 203 are detachably connected by pins, and with the symmetrically arranged first hydraulic cylinders 209, the overall height of the front support leg 2 can be precisely adjusted to meet the requirements of the bridge's longitudinal slope and segmental assembly accuracy; the support column 204 is connected to the bottom end of the first outer sleeve 203 and directly docks with the temporary support or pier to ensure effective load transfer.

[0104] In an optional embodiment, the front support leg 2 further includes: an upper cross brace 205, a lower cross brace 206, and a first diagonal brace 207;

[0105] The upper horizontal brace 205 is connected to the two supporting columns 204 at both ends respectively;

[0106] The lower cross brace 206 is connected to the two supporting columns 204 at both ends, and the lower cross brace 206 is located below the upper cross brace 205.

[0107] Two first diagonal braces 207 are symmetrically arranged between the upper cross brace 205 and the lower cross brace 206; the two ends of the first diagonal brace 207 are respectively connected to the upper cross brace 205 and the lower cross brace 206.

[0108] Understandably, during use, by adding an upper horizontal brace 205, a lower horizontal brace 206, and a first diagonal brace 207 between the two supporting columns 204, a spatial truss-type support system is formed, significantly improving its overall stiffness and resistance to lateral instability. Specifically, the upper horizontal brace 205 and the lower horizontal brace 206 are respectively connected to the upper and lower positions of the two supporting columns 204, forming a stable lateral constraint. The two first diagonal braces 207 are symmetrically arranged between the upper horizontal brace 205 and the lower horizontal brace 206, together forming multiple triangular units, effectively transmitting and dispersing horizontal forces and torques, and enhancing the structural stability of the front outrigger 2 under asymmetrical loads or eccentric load conditions.

[0109] In an optional embodiment, the front support leg 2 further includes: at least two first longitudinal movement mechanisms 210; the first longitudinal movement mechanisms 210 are located at the upper end of the upper truss 201; each first longitudinal movement mechanism 210 is equipped with a pulley and a reducer for driving the pulley to rotate; the two first longitudinal movement mechanisms 210 are respectively engaged with the sliding tracks 101f on the two truss beams 101 through the pulleys, so that the front support leg 2 can move and change span at the front end of the main beam 1 through the drive motor. It can be understood that through the above design, the adaptability of the bridge erecting machine to multi-span combination conditions such as 45+50+45m and 70m single span can be significantly improved, enhancing construction flexibility and automation level; at the same time, the rolling connection method reduces movement resistance, ensures stable operation and positioning accuracy, and provides reliable support for the efficient and safe completion of segmental beam erection.

[0110] Furthermore, the middle support leg 3 includes: a second hinge seat 301, a second longitudinal movement mechanism 302, a shifting trolley 303, a middle support leg cross brace 304, a transverse movement mechanism 305, a first support beam 306, and a lifting mechanism 307.

[0111] One end of the lifting mechanism 307 is connected to the upper end of the segmental beam block or temporary support, and the other end is connected to the bottom end of the first support beam 306; there are at least four lifting mechanisms 307, which are configured to adjust the overall height of the middle support leg 3 by hydraulic drive.

[0112] The two aforementioned transfer trolleys 303 are detachably mounted on the upper end of the first support beam 306;

[0113] The two ends of the middle support leg 304 are respectively connected to the two transfer trolleys 303;

[0114] The four second hinge seats 301 are detachably connected to the bottom end of the corresponding lower chord 101b;

[0115] One of the aforementioned transfer trolleys 303 is connected to the bottom ends of two corresponding second hinge seats 301;

[0116] The second longitudinal movement mechanism 302 is located at the middle of the upper end of the displacement trolley 303, and its upper end is connected to the sliding track 101f, which is used to drive the main beam 1 to move along the construction direction;

[0117] Two sets of the transverse movement mechanisms 305 are arranged in a mirror-symmetrical manner on the upper end of the first support beam 306; each set of the transverse movement mechanism 305 includes a hydraulic cylinder, and the movable end of the hydraulic cylinder is connected to the corresponding side of the shifting trolley 303; the two sets of the transverse movement mechanisms 305 are configured to keep the stroke length of their movable ends equal and opposite in direction during the movement, so as to work together to drive the main beam 1 to move smoothly in the transverse direction.

[0118] Understandably, during use, the direct connection design between the lifting mechanism 307 and the first supporting crossbeam 306 and the segmental beam blocks, combined with the configuration of at least four hydraulic drives, enables the height of the entire middle support leg 3 to be precisely and stably adjusted, effectively adapting to the elevation requirements under different working conditions; the shifting trolley 303 adopts a detachable design and forms a stable connection frame with the middle support leg cross brace 304, improving the modularity and the convenience of on-site assembly and transportation; the second longitudinal movement mechanism 302 directly acts on the sliding track 101f, providing the main beam 1 with the traveling force along the construction direction; and most importantly, the two sets of mirror-symmetrically arranged transverse movement mechanisms 305, through the coordinated movement of their hydraulic cylinder moving ends in opposite directions, can precisely and smoothly drive the main beam 1 to move laterally.

[0119] In an optional embodiment, the second longitudinal movement mechanism 302 includes: a pulley block that rolls with the sliding rail 101f, a fastening component that can be releasably connected to the sliding rail 101f, a mounting base for mounting the pulley block and the fastening component, and a hydraulic cylinder; the fixed end of the hydraulic cylinder is connected to the shifting trolley 303, and the movable end is connected to the mounting base. It is understood that during use, the second longitudinal movement mechanism 302 operates as follows: when the fastening component presses against the sliding rail 101f, the movable end of the hydraulic cylinder extends, thereby pushing the main beam 1 to move a distance equal to the cylinder's extension length along the construction direction; subsequently, the fastening component is released from the sliding rail 101f, and the movable end of the hydraulic cylinder retracts to its initial position; by repeating this cyclic process and using multiple second longitudinal movement mechanisms 302, intermittent traveling movement of the main beam 1 along the construction direction can be achieved.

[0120] Understandably, during use, the middle support leg 3 has three states: first, the longitudinal movement drive state, in which it is anchored to the segmental beam block or temporary support, and drives the main beam 1 to move along the construction direction through the second longitudinal movement mechanism 302; second, the beam erection state, in which its bottom end is anchored to the segmental beam block or temporary support, and its upper end is anchored to the lower chord 101b; and third, the waiting-to-be-lifted state, in which its bottom end is released from contact with the segmental beam block or temporary support, and moves with the main beam 1, after which it can be lifted to the front end of the main beam 1 by the overhead crane 5. This multi-state switching mechanism effectively adapts to the construction needs of multi-span combined construction, reduces the investment in auxiliary equipment, and improves the level of automation and the continuity of operation.

[0121] Furthermore, the rear outrigger 4 includes: a third hinge seat 401, a second outer sleeve 402, a second inner sleeve 403, a rear outrigger cross brace 404, a second hydraulic cylinder 405, a second support beam 406, and an adjusting support 407.

[0122] The two adjustment supports 407 are movably mounted on the segmental beam block or temporary support, and their upper ends are connected to the bottom end of the second support beam 406; the two adjustment supports 407 are configured to cooperate in adjusting the second support beam 406 to a horizontal position.

[0123] The upper end of the second outer sleeve 402 is connected to the lower chord 101b via the third hinge seat 401;

[0124] The upper end of the second inner sleeve 403 passes through the bottom end of the second outer sleeve 402 and is inserted into the second outer sleeve 402; the second inner sleeve 403 and the second outer sleeve 402 are detachably connected by a pin structure that passes through both.

[0125] The two ends of the rear support leg cross brace 404 are respectively connected to two second outer sleeves 402;

[0126] The fixed end of the second hydraulic cylinder 405 is located on the rear outrigger cross brace 404, and its movable end is connected to the second support beam 406 located below it.

[0127] Two sets of adjustment structures, each consisting of two second outer sleeves 402, two second inner sleeves 403, one rear outrigger cross brace 404, and one second hydraulic cylinder 405, are mirror-symmetrical about the axis of the second support beam 406. The adjustment structures are configured to adjust the overall height of the rear outrigger 4 by synchronously adjusting the extension and retraction of the movable ends of the two second hydraulic cylinders 405.

[0128] Understandably, during use, the rear support leg 4 adopts a height-adjustable, structurally symmetrical modular design, which significantly improves the adaptability and stability of the tail support of the bridge erecting machine. Specifically: two adjusting supports 407 are installed on the segmental beam blocks or temporary supports, which can coordinately adjust the second support beam 406 to a horizontal state to ensure uniform force distribution; the second outer sleeve 402 is detachably connected to the lower chord 101b through the third hinge 401, which facilitates quick installation and relocation; the second inner sleeve 403 is inserted into the second outer sleeve 402 and reliably positioned by a pin; the rear support leg cross brace 404 connects the two second outer sleeves 402 to enhance the overall lateral stiffness; the second hydraulic cylinder 405 connects the rear support leg cross brace 404 and the second support beam 406. The two sets of adjusting structures are arranged symmetrically with respect to the axis of the second support beam 406. Through synchronous extension and retraction, the overall height of the rear support leg 4 is precisely adjusted, which effectively adapts to the changes in the longitudinal slope of the bridge and the elevation of the segmental assembly, ensuring the stability of the main beam 1 and construction safety.

[0129] In an optional embodiment, auxiliary support rods are fixedly provided at the upper ends of the two second outer sleeves 402 facing each other, and the auxiliary support rods are located directly above the rear support leg cross brace 404; a number of oblique support rods are fixed between the auxiliary support rods and the rear support leg cross brace 404, thereby effectively improving the overall torsional stiffness and lateral stability of the rear support leg 4, significantly suppressing the lateral deformation caused by asymmetric loads or wind loads, and greatly improving the structural reliability and construction safety of the rear support leg 4 without significantly increasing its self-weight, providing a strong guarantee for stable support under multi-span combined working conditions.

[0130] It should be noted that all hydraulic mechanisms involved in this embodiment are electrically controlled, and all pump stations in the hydraulic mechanism are connected to the oil cylinders they control using type A crimped hose joints and welded pipe joints; all vertical motors used are Y-series (IP44 protection level) three-phase asynchronous motors with a rated voltage of 380V and a rated frequency of 50Hz; all valve components (electromagnetic directional valves, electromagnetic relief valves) and displacement sensors used are DC 24V; at the same time, the electrical control system of the hydraulic mechanism of the bridge erecting machine is equipped with electrical components to prevent the motor from reversing, so as to avoid burning out the oil pump during operation; in other embodiments, other types of hydraulic mechanisms may also be used, which are not specifically limited here.

[0131] It should be noted that in this embodiment, the front support leg 2, the middle support leg 3, and the rear support leg 4 are also provided with several auxiliary components, such as ladders and guardrails, to facilitate construction operations. In other embodiments, other types of auxiliary components may also be used, which are not specifically limited here.

[0132] Example 2, please refer to Figures 8 to 18 This invention provides a construction method for an adaptive segmental beam bridge erection machine compatible with multi-span combinations, including a method for the bridge erection machine to pass through spans. The specific steps are as follows:

[0133] S1: Release the anchorage connection between the front support leg 2 and the temporary support or pier; raise the bottom height of the rear support leg 4 and lift it off the ground; release the anchorage connection between the middle support leg 3 located at the rear end of the main beam 1 and the segmental beam block, and release the anchorage connection between the other three middle support legs 3 and the lower chord 101b.

[0134] S2: Drive the main beam 1 to move along the construction direction through the second longitudinal movement mechanism 302 on the three middle support legs 3 and complete the first forward movement through the hole, and support the front support leg 2 on the first temporary support 10 next to the first pier 9, and reserve a middle support leg 3 installation position on the first temporary support 10.

[0135] S3: The middle support leg 3 located at the rear end of the main beam 1 is hoisted to the reserved installation position on the first temporary support 10 by the crane 5, and the middle support leg 3 is anchored to the first temporary support 10.

[0136] S4: Repeat steps S1 to S3, and drive the main beam 1 to complete the second and third through holes in sequence through the three middle support legs 3 located in the middle and front of the main beam 1.

[0137] S5: Using two overhead cranes 5, a section of beam is hoisted onto the second pier 11 and the third pier 13 and anchored. Then, using two overhead cranes 5, a section of beam is hoisted onto the first pier 9 and the third pier 13 and anchored.

[0138] S6: Release the anchorage of the first temporary support 10 and the second temporary support 12 to the corresponding middle support leg 3, and use two overhead cranes 5 to lift the two middle support legs 3 onto the segment beam blocks of their adjacent piers for support, and anchor the middle support legs 3 to the segment beam blocks.

[0139] S7: The overhead crane 5 is used to lift one of the middle support legs 3 located at the rear end of the main beam 1 to the segment beam block of the third pier 13, and the middle support leg 3 is anchored to the segment beam block; then, the four middle support legs 3 are anchored to the main beam above them, and the height of the bottom end of the rear support leg 4 is adjusted to support the segment beam.

[0140] In an optional embodiment, step S7 further includes: anchoring one of the middle legs 3 adjacent to the rear leg 4 to the segmental beam block below it to ensure the stable operation of the bridge erecting machine during subsequent beam erection.

[0141] Further, please refer to Figures 19 to 31 The bridge erection machine's beam erection method includes the following steps:

[0142] S10: Remove the heightened sections on the first temporary support 10 and the second temporary support 12 respectively using the two overhead cranes 5;

[0143] S20: The two overhead cranes 5 respectively lift a segment of beam to the vicinity of the second pier 11 and glue it together with the segment of beam at the upper end of the second pier 11; then, the two segment of beam is supported by the hanging assembly 8 to release the two overhead cranes 5, and the multiple segment of beam is prestressed and installed.

[0144] S30: Repeat step S20, and use two overhead cranes 5 to cyclically suspend and assemble segmental beam blocks on both sides of the segmental beams on the first pier 9 and the second pier 11.

[0145] S40: Using one of the aforementioned overhead cranes 5, multiple segment beam blocks are hoisted sequentially to complete the erection of the sections between the spanned pier and the first pier 9, and between the second pier 11 and the third pier 13, and to temporarily support these segment beam blocks using multiple hanging assemblies 8; then, the gluing and splicing of these segment beam blocks are carried out sequentially.

[0146] S50: The mid-span closure segment beam blocks are hoisted into place using one of the aforementioned overhead cranes 5. At the same time, wet joints are constructed between the segment beam blocks in the side span section, and tensioning and grouting are performed. Afterward, wet joints are constructed between the segment beam blocks in the mid-span section, and tensioning and grouting are performed.

[0147] S60: After the segmental beam reaches a stable state, the wet joint template and the hanging assembly 8 are removed in sequence, and then the bridge erecting machine is unloaded.

[0148] It should be noted that, in this embodiment, the middle span is the section between the first pier 9 and the second pier 11; the side span is the section between the erected pier and the first pier 9, and between the second pier 11 and the third pier 13.

[0149] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0150] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0151] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0152] In this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it; those skilled in the art will readily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method for an adaptive segmental beam bridge erection machine compatible with multi-span combinations, applied to the bridge erection machine, the bridge erection machine comprising: The main beam (1), front support leg (2), middle support leg (3), rear support leg (4), overhead crane (5), and auxiliary crane (6) are included. The main beam (1) has a frame structure and includes two truss beams (101) and two end cross braces (102). The cross section of the truss beam (101) is triangular and includes connecting sections at both ends and several standard sections between the two connecting sections. The connecting sections and the standard sections, as well as the standard sections and the standard sections, are detachably connected by bolts. One end cross brace (102) is detachably connected to the connecting section at the same end of the two truss beams (101) by bolts. The total length of the main beam (1) is 175m to 190m, and the number of standard sections on one truss beam (101) does not exceed 15. A longitudinal track (101d) is fixed along its length at one end; the front support leg (2) and the rear support leg (4) are detachably located at both ends of the bottom of the main beam (1); the middle support leg (3) is located at the bottom of the main beam (1) and between the front support leg (2) and the rear support leg (4); the number of the middle support legs (3) is at least four, used to support the main beam (1) and / or drive the main beam (1) to travel along the construction direction; the two overhead cranes (5) and the two auxiliary overhead cranes (6) are all located on the upper end of the main beam (1) through the longitudinal track (101d) and can move back and forth along the construction direction; the two overhead cranes (5) are located between the two auxiliary overhead cranes (6) to cooperate in completing the hoisting of multiple segment beam blocks, characterized in that it includes the method of the bridge erecting machine passing through the hole, the specific steps of which are as follows: S1: Release the anchorage connection between the front support leg (2) and the temporary support or pier; raise the bottom height of the rear support leg (4) and lift it off the ground; release the anchorage connection between the middle support leg (3) located at the rear end of the main beam (1) and the segmental beam block, and release the anchorage connection between the other three middle support legs (3) and the lower chord (101b). S2: Drive the main beam (1) to move along the construction direction through the second longitudinal movement mechanism (302) on the three middle support legs (3) and complete the first forward movement through the hole, and support the front support leg (2) on the first temporary support (10) next to the first pier (9), and reserve a middle support leg (3) installation position on the first temporary support (10); S3: Using a crane (5), the middle support leg (3) located at the rear end of the main beam (1) is hoisted to the reserved installation position on the first temporary support (10), and the middle support leg (3) is anchored to the first temporary support (10). S4: Repeat steps S1 to S3, and drive the main beam (1) to complete the second and third through holes in sequence by means of the three middle support legs (3) located in the middle and front end of the main beam (1); S5: Using two overhead cranes (5), a section of beam is hoisted onto the second pier (11) and the third pier (13) and anchored. Then, using two overhead cranes (5), a section of beam is hoisted onto the first pier (9) and the third pier (13) and anchored. S6: Release the anchorage of the first temporary support (10) and the second temporary support (12) with the corresponding middle support leg (3), and use two cranes (5) to lift the two middle support legs (3) onto the segment beam blocks of their adjacent piers for support, and anchor the middle support legs (3) to the segment beam blocks. S7: The middle support leg (3) located at the rear end of the main beam (1) is hoisted to the segment beam block of the third pier (13) by the crane (5), and the middle support leg (3) is anchored to the segment beam block; then, the four middle support legs (3) are anchored to the main beam above them, and the bottom height of the rear support leg (4) is adjusted to be supported on the segment beam.

2. The construction method according to claim 1, characterized in that, The truss beam (101) also includes: an upper chord (101a), a lower chord (101b), a web member (101c), a cross member (101e), and a sliding track (101f). One upper chord (101a) and two lower chords (101b) are arranged in an isosceles triangle; The longitudinal track (101d) is fixedly installed at the middle of the upper end of the upper chord (101a); The two ends of the web member (101c) are respectively hinged to the upper chord member (101a) and the lower chord member (101b); Two lower chords (101b) are fixed to each end of the crossbar (101e); a plurality of crossbars (101e) are arranged at equal intervals along the length of the truss beam (101), wherein multiple non-adjacent crossbars (101e) are fixedly connected to corresponding groups of diagonal braces; each group of diagonal braces is arranged in an X-shape, with one end connected to the middle of the crossbar (101e) and the other end connected to the lower chord (101b). The sliding track (101f) is fixedly installed at the bottom center of several crossbars (101e) along the length of the truss beam (101) to connect with the middle support leg and realize the travel movement of the main beam (1).

3. The construction method according to claim 2, characterized in that, Within one of the connecting sections or the standard sections, two adjacent web members (101c) are arranged in an inverted V shape and form a stable triangular support unit with the connected upper chord (101a) or lower chord (101b); at the same time, between the two inverted V-shaped web members (101c) at the key structural stress position of the truss beam (101), a web member (101c) located in the vertical plane is also added.

4. The construction method according to claim 2, characterized in that, The upper chord (101a) and the lower chord (101b) are I-beams welded from Q355B steel plates; the web member (101c) is a hollow tubular member.

5. The construction method according to any one of claims 2-4, characterized in that, The front support leg (2) includes: an upper truss (201), a first inner sleeve (202), a first outer sleeve (203), a support column (204), a first hinge seat (208), and a first hydraulic cylinder (209); The upper end of the upper truss (201) is fixedly provided with a plurality of the first hinge seats (208). The first hinge (208) is detachably connected to the lower chord (101b) by bolt connection; The two first inner sleeves (202) are fixed at both ends of the bottom of the upper truss (201) by screw connection; The first outer sleeve (203) corresponds one-to-one with the first inner sleeve (202); The first outer sleeve (203) is movably sleeved on the outer periphery of the first inner sleeve (202), and the first outer sleeve (203) and the first inner sleeve (202) are detachably connected by a pin structure that passes through both. A connecting crossbar is fixedly provided between the two first outer sleeves (203); Two first hydraulic cylinders (209) are symmetrically arranged on the same side of the upper truss (201), and their movable ends are connected to the connecting crossbar. This allows the relative position of the first outer sleeve (203) and the first inner sleeve (202) to be adjusted by synchronously adjusting the extension and retraction of the movable ends of the two first hydraulic cylinders (209), thereby adjusting the overall height of the front support leg (2). One end of the support column (204) is connected to the bottom end of the first outer sleeve (203), and the other end is connected to the temporary support or pier.

6. The construction method according to claim 5, characterized in that, The front support leg (2) further includes: at least two first longitudinal movement mechanisms (210); the first longitudinal movement mechanism (210) is located at the upper end of the upper truss (201); the first longitudinal movement mechanism (210) is provided with pulleys and a reducer for driving the pulleys to rotate; the two first longitudinal movement mechanisms (210) are in rolling cooperation with the sliding tracks (101f) on the two truss beams (101) respectively through the pulleys, so that the front support leg (2) can move and change span at the front end of the main beam (1) through the drive motor.

7. The construction method according to any one of claims 2-4, characterized in that, The middle support leg (3) includes: a second hinge seat (301), a second longitudinal movement mechanism (302), a shifting trolley (303), a middle support leg cross brace (304), a transverse movement mechanism (305), a first support beam (306), and a lifting mechanism (307). One end of the lifting mechanism (307) is connected to the upper end of the segmental beam block or temporary support, and the other end is connected to the bottom end of the first support beam (306); there are at least four lifting mechanisms (307), which are configured to adjust the overall height of the middle support leg (3) by hydraulic drive. The two transfer trolleys (303) are detachably mounted on the upper end of the first support beam (306); The two ends of the middle support leg cross brace (304) are respectively connected to the two transfer trolleys (303); The four second hinge seats (301) are detachably connected to the bottom end of the corresponding lower chord (101b); One of the aforementioned transfer trolleys (303) is connected to the bottom ends of two corresponding second hinge seats (301); The second longitudinal movement mechanism (302) is located at the middle of the upper end of the transfer trolley (303), and its upper end is connected to the sliding track (101f) to drive the main beam (1) to move along the construction direction; Two sets of the transverse movement mechanisms (305) are arranged in a mirror-symmetrical manner on the upper end of the first support beam (306); each set of the transverse movement mechanism (305) includes a hydraulic cylinder, and the movable end of the hydraulic cylinder is connected to the corresponding side of the shifting trolley (303); the two sets of the transverse movement mechanisms (305) are configured to keep the stroke length of their movable ends equal and opposite in direction during the movement, so as to work together to drive the main beam (1) to move smoothly in the transverse direction.

8. The construction method according to any one of claims 2-4, characterized in that, The rear outrigger (4) includes: a third hinge (401), a second outer sleeve (402), a second inner sleeve (403), a rear outrigger cross brace (404), a second hydraulic cylinder (405), a second support beam (406), and an adjusting support (407). The two adjustment supports (407) are movably mounted on the segmental beam block or temporary support, and their upper ends are connected to the bottom end of the second support beam (406); the two adjustment supports (407) are configured to cooperate in adjusting the second support beam (406) to a horizontal position; The upper end of the second outer sleeve (402) is connected to the lower chord (101b) through the third hinge (401); The upper end of the second inner sleeve (403) passes through the bottom end of the second outer sleeve (402) and is inserted into the second outer sleeve (402); the second inner sleeve (403) and the second outer sleeve (402) are detachably connected by a pin structure that passes through them; The two ends of the rear support leg cross brace (404) are respectively connected to two second outer sleeves (402); The fixed end of the second hydraulic cylinder (405) is located on the rear outrigger cross brace (404), and its movable end is connected to the second support cross beam (406) located below it. Two sets of adjustment structures, each consisting of two second outer sleeves (402), two second inner sleeves (403), one rear outrigger cross brace (404), and one second hydraulic cylinder (405), are mirror-symmetrical about the axis of the second support beam (406). The adjustment structures are configured to adjust the overall height of the rear outrigger (4) by synchronously adjusting the extension and retraction of the movable ends of the two second hydraulic cylinders (405).

9. The construction method according to claim 1, characterized in that, The bridge erection method of the bridge erecting machine includes the following steps: S10: The heightening sections on the first temporary support (10) and the second temporary support (12) are removed by the two overhead cranes (5); S20: The two overhead cranes (5) respectively lift a segment of beam to the vicinity of the second pier (11) and glue it together with the segment of beam at the upper end of the second pier (11); then, the two segment of beam is supported by the hanging assembly (8) to release the two overhead cranes (5) and prestress the multiple segment of beam; S30: Repeat step S20, and use two overhead cranes (5) to cyclically suspend and assemble segmental beam blocks on both sides of the segmental beam on the first pier (9) and the second pier (11); S40: Using one of the above-mentioned overhead cranes (5), multiple segment beam blocks are hoisted in sequence to complete the erection of the sections between the spanned pier and the first pier (9) and between the second pier (11) and the third pier (13), and use multiple hanging assemblies (8) to temporarily support these segment beams; then, the gluing operation between these segment beam blocks is carried out in sequence. S50: The mid-span closure segment beam is hoisted into place by one of the aforementioned overhead cranes (5). At the same time, wet joints are made in the gaps between the segment beams in the side span section, and tensioning and grouting are performed. After that, wet joints are made in the gaps between the segment beams in the mid-span section, and tensioning and grouting are performed. S60: After the segmental beam reaches a stable state, the wet joint template and the hanging assembly (8) are removed in sequence, and then the bridge erecting machine is unloaded.

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