Four-crown-block bridge girder erection machine

Abstract

The utility model provides a four crown block bridge girder erection machine which comprises two longitudinal frames which are supported on supporting feet and distributed in the transverse bridge direction and extend in the longitudinal bridge direction and four crown blocks which can be movably installed on a bridge girder erection machine body, and the four crown blocks are distributed on the longitudinal frames in the longitudinal bridge direction. The utility model aims to provide the four-crown-block bridge girder erection machine which does not need to be in lap joint with a temporary fixing structure when the first bridge span is composed of a plurality of sections, and the problem that the construction efficiency is low due to the fact that a temporary support needs to be built and fixed when an existing first bridge span is composed of a plurality of sections is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a four-crane bridge erecting machine. Background Art

[0002] With the continuous development of urban construction, a large number of expressway projects across rivers and streams have emerged. Compared with the construction of bridges on land, the difficulty and construction risk of bridges in water areas have increased significantly. The construction of bridges in water areas generally requires the construction of trestles. The construction site is limited, the cost of temporary measures is high, and the turnover efficiency of temporary materials is low, which brings great difficulties to the construction. This has many restrictions on the selection of beam erection equipment and construction technology. Compared with the erection of bridges on land, it increases the difficulty of construction. Traditional beam erection in water areas usually adopts the method of less support for construction, which requires the addition of supporting trestles and supports. According to the construction of supporting trestles, temporary supports, support installation or temporary support installation, crane placement, main beam installation, installation of end (middle) beams, installation of small beams, paint repair, support removal, and support trestles removal, but the increase of temporary materials is not conducive to project cost control. These factors make the project department urgently need to improve the traditional construction method of less support. For this purpose, a reinforcement machine was designed for construction. The existing bridge-building machine is equipped with two overhead cranes. When one section of the bridge is composed of multiple sections, a temporary support is required to fix the bridge section in place after one section is moved into place at both ends by the overhead crane, and then the overhead crane is used to lift another section for docking. This method leads to low construction efficiency when one section is composed of multiple sections. Utility Model Content

[0003] The utility model aims to provide a four-trolley bridge erecting machine which does not need to overlap temporary fixed structures when a bridge is composed of multiple sections, thereby solving the problem of low construction efficiency caused by the need to build temporary supports and fixations when an existing bridge is composed of multiple sections.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technology: a four-crane bridge-building machine, including two longitudinal frames supported on supporting feet and distributed in the transverse bridge direction and extending in the longitudinal bridge direction, and a crane that can be movably installed on the bridge-building machine body, characterized in that the crane has four parts, and the four cranes are distributed on the longitudinal frames along the longitudinal bridge direction; when in use, the erected bridge segment is used as a support so that one end of the longitudinal frame is supported on the erected bridge segment and the other end is supported on the foot pier adjacent to the erected bridge segment through the supporting feet, and then the two bridge segments are moved to be docked together and erected on the foot pier adjacent to the erected bridge segment and the bridge pier adjacent to the foot pier adjacent to the erected bridge segment by hanging two cranes at both ends of a bridge segment.

[0005] Preferably, a first longitudinal track is provided on the longitudinal frame, two of the four overhead cranes are curved arm overhead cranes, and the remaining two overhead cranes are straight arm overhead cranes, the curved arm overhead crane comprises a crossbeam at both ends movably supported on the first longitudinal tracks of the two longitudinal frames and two curved arm suspension structures connected to the crossbeam and distributed along the transverse direction of the bridge, the curved arm suspension structure comprises a suspension seat slidably connected to the crossbeam, a curved arm rotatably suspended on the suspension seat at the upper end, a curved arm portion connection structure rotatably connected to the lower end of the curved arm for connection with the bridge segment, and a hook connected to the crossbeam at the upper end, the curved arm comprises an upper vertical section rotatably suspended on the suspension seat at the upper end, a The upper horizontal section at the lower end of the upper vertical section, the vertical telescopic rod connected to the other end of the upper horizontal section at the upper end, the lower horizontal section with one end connected to the lower end of the vertical telescopic rod and the lower vertical section with the upper end connected to the other end of the lower horizontal section, the curved hanging arm connection structure can be rotatably suspended on the lower end of the lower vertical section, the upper vertical section and the lower vertical section are coaxial, the upper horizontal section includes a first section connected to the lower end of the upper vertical section at one end and a second section connected to the first section at one end so as to be pluggable, the other end of the second section is connected to the upper end of the vertical telescopic rod; the straight hanging arm overhead crane includes a straight arm suspension structure connected to the two longitudinal frames in a one-to-one correspondence, the straight arm suspension structure includes a longitudinal sliding rod, an upper end can The slidable straight hanging arm on the longitudinal sliding rod and the straight hanging arm connecting structure connected to the lower end of the straight hanging arm for connecting with the bridge segment can be slidably hung; the hook and the upper vertical section are distributed on both radial sides of the longitudinal sliding rail and the lower ends are both located below the longitudinal sliding rod; the second segment can be rotated to be hung on the hook as the upper vertical section; when the second segment is hung on the hook, the end of the second segment connected to the first segment is located on the side of the straight hanging arm away from the upper vertical section; when the curved hanging arm is rotated to the state where the vertical telescopic rod is located between the two straight hanging arms to suspend the bridge segment, the bridge segment suspended by the curved hanging arm can pass between the two straight hanging arms; when the vertical telescopic rod is suspended on the hook through the second segment When the straight hanging arm is used to hang the bridge segment in the state, the bridge segment hung by the straight hanging arm can pass between the two curved hanging arms; the process of installing the bridge segment is as follows: A, after being fixed to both ends of a bridge segment to be erected by two straight hanging arm cranes, the crane moves forward to the rear end of the bridge segment to be erected fixed by the straight hanging arm crane and docks with the front end of the bridge segment that has been erected; B, after being fixed to both ends of the next bridge segment to be erected by two curved hanging arm cranes, the crane moves forward to the rear end of the bridge segment to be erected fixed by the curved hanging arm crane and docks with the front end of the bridge segment to be erected in step A, and the above steps are repeated until all bridge segments are laid;When the straight-arm overhead crane passes between the curved-arm overhead cranes, the upper vertical section of the curved arm is first rotated as an axis to the part of the curved arm below the second section and hung on the hook through the second section, and then the upper vertical section is driven to move in a direction away from the hook to the first section and disengage from the second section, and the first section is staggered with the straight-arm overhead crane along the transverse direction, and finally the straight-arm overhead crane passes between the curved-arm overhead cranes, and the first section and the second section are connected after the straight-arm overhead crane passes between the curved-arm overhead cranes; when the curved-arm overhead crane passes between the straight-arm overhead cranes, the upper vertical section of the curved arm is first rotated as an axis to the vertical telescopic rod located on the side of the upper vertical section away from the straight-arm overhead crane, and then the curved-arm overhead crane passes between the straight-arm overhead cranes. When the bridge is erected, the number of bridge segments between two piers can be more than three, which is convenient for erecting a large-span bridge (when the span is large, one span is divided into multiple bridge segments for construction). When the existing bridge erection machine is not equipped with auxiliary supports, the number of overhead cranes must be twice the number of bridge segments between one pier and another. When constructing multiple bridge segments, the number of overhead cranes is large, which not only increases the cost of the bridge erection machine but also reduces the efficiency of bridge erection).

[0006] Preferably, the slide bar is suspended on the longitudinal frame through a plurality of horizontal latches distributed along the longitudinal bridge direction, one end of the horizontal latch is inserted into the longitudinal slide bar, and the other end is inserted into the longitudinal frame, and a return spring is sleeved on the horizontal latch to drive the horizontal latch to be inserted into the longitudinal slide bar, one end of the return spring is connected to the longitudinal frame, and the other end is connected to the stopper on the horizontal latch, and both sides of the longitudinal bridge direction where one end of the horizontal latch is connected to the longitudinal slide bar are provided with extraction guide inclined surfaces, and the straight hanging arm is suspended on the longitudinal slide bar through a sliding sleeve sleeved on the longitudinal slide bar, and both ends of the sliding sleeve are provided with an extrusion inclined surface for driving the extraction guide inclined surface to extract the horizontal latch from the longitudinal slide bar; during the forward movement of the straight hanging arm structure, the extrusion inclined surface is pressed against the extraction guide inclined surface to extract the horizontal latch and enable the sliding sleeve to pass over the horizontal latch, and after the sliding sleeve passes over the horizontal latch, the horizontal latch is inserted into the longitudinal slide rail under the action of the return spring. This enables the straight hanging arm structure to conveniently pass over the connection between the longitudinal slide rail and the longitudinal frame.

[0007] Preferably, the straight arm suspension structure further includes a sleeve driving structure, which includes a second longitudinal track arranged on the longitudinal frame and located below the first longitudinal track, a longitudinal rack of the sleeve driving structure part arranged on the second longitudinal track, a gear of the sleeve driving structure part meshing with the longitudinal rack of the sleeve driving mechanism part, a motor of the sleeve driving structure part driving the gear of the sleeve driving structure part, a balance wheel of the sleeve driving structure part supported on the second longitudinal track, a shift fork connected to the gear of the sleeve driving structure part and the balance wheel of the sleeve driving structure part at the same time, and a pull rod inserted in the shift fork, wherein the pull rod is connected to the sleeve. When in use, the sleeve is moved by rotating the gear driven by the motor of the sleeve driving mechanism part, which is convenient and labor-saving when moving.

[0008] Preferably, both ends of the crossbeam are provided with a crossbeam driving structure, which includes a longitudinal rack of the crossbeam driving structure part arranged on the first longitudinal track, a gear of the crossbeam driving structure part meshing with the longitudinal rack of the crossbeam driving mechanism part, a motor of the crossbeam driving structure part driving the gear of the crossbeam driving structure part, and a balance wheel of the crossbeam driving structure part supported on the first longitudinal track, and the crossbeam is simultaneously connected to the gear of the crossbeam sleeve driving structure part and the balance wheel of the crossbeam driving structure part. When in use, the movement of the articulated boom crane is realized by driving the gear of the crossbeam driving mechanism part motor to rotate, which is convenient and labor-saving when moving.

[0009] Preferably, the cross beam is provided with a slide groove extending in the horizontal direction, the two suspension seats are slidably suspended in the slide groove, and the two sliders are connected together by a double-headed cylinder. When in use, the two crank arm suspension structures are driven to separate and connect by the extension and contraction of the double-headed cylinder so that the upper cross section is connected and disconnected.

[0010] Preferably, a suspension head is provided at the upper end of the upper vertical section, and the suspension head is supported on the suspension seat through a plane bearing.

[0011] Preferably, the second segment is a ferromagnetic structure, the first segment is provided with a connecting transverse hole, the connecting transverse hole is provided with a permanent magnet, and the second segment is inserted into the connecting transverse hole, so as to ensure the connection reliability between the first segment and the second segment.

[0012] Preferably, the curved arm connection structure and the straight arm connection structure have the same structure, and outward flanges are provided on both sides of the bridge segment. The curved arm connection structure includes an upper suspension plate, a lower suspension plate and an end plate connecting one end of the upper and lower suspension plates together, and a bayonet is formed between the other ends of the upper and lower suspension plates. The outward flange is inserted into the bayonet to realize the connection between the curved arm connection structure and the bridge segment.

[0013] The utility model has the following beneficial effects: when a bridge has multiple sections, construction can be carried out without the need for temporary fixed structure support, thereby improving the efficiency of bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a left side schematic diagram of the utility model;

[0015] Figure 2 This is a schematic diagram of a curved boom crane passing a straight boom crane;

[0016] Figure 3 This is a front view schematic diagram of the straight-arm overhead crane preparing to pass the curved-arm overhead crane;

[0017] Figure 4 yes Figure 3 A local enlarged schematic diagram of point A;

[0018] Figure 5 is a cross-sectional schematic diagram of a crank arm suspension structure;

[0019] Figure 6 It is a top view schematic diagram of the utility model;

[0020] Figure 7 yes Figure 6 A local enlarged schematic diagram of point B;

[0021] Figure 8 It is a front view schematic diagram of the straight-arm overhead crane passing through the curved-arm overhead crane.

[0022] In the figure: supporting foot 1, longitudinal frame 2, overhead crane 3, erected bridge segment 5, foot pier 6 adjacent to the erected bridge segment, bridge segment 7, bridge pier 8 adjacent to the foot pier adjacent to the erected bridge segment of the erected bridge segment, first longitudinal track 9, curved hanging arm overhead crane 10, straight hanging arm overhead crane 11, crossbeam 12, curved arm suspension structure 13, suspension seat 14, curved hanging arm connection structure 15, hook 16, upper vertical section 17, upper horizontal section 18, vertical telescopic rod 19, lower horizontal section 20, lower vertical section 21, first segment 22, second segment 23, crossbeam driving structure 24, crossbeam driving structure gear 25, crossbeam driving structure motor 26, balancing wheel 27 of beam drive structure, slide groove 28, double-headed cylinder 29, suspension head 30, plane bearing 31, permanent magnet 32, outer flange 33, upper suspension plate 34, lower suspension plate 35, end plate 36, longitudinal slide rod 37, straight hanging arm 38, straight hanging arm connecting structure 39, horizontal latch 40, return spring 41, block 42, extraction guide inclined surface 43, sliding sleeve 44, extrusion inclined surface 45, second longitudinal track 46, longitudinal rack 47 of sliding sleeve drive structure, gear 48 of sliding sleeve drive structure, motor 49 of sliding sleeve drive structure, balancing wheel 50 of sliding sleeve drive structure, shift fork 51, pull rod 52, straight arm suspension structure 53. DETAILED DESCRIPTION

[0023] The utility model is described below in conjunction with the accompanying drawings and specific embodiments. The anchor rod is tilted in a state where one end connected to the inner enclosure wall is high and the other end is low, and the lower end of the anchor rod is lower than the bottom of the inner pit.

[0024] See also Figures 1 to 8A four-crane bridge erecting machine comprises two longitudinal frames 2 supported on support legs 1 and extending in the transverse direction and longitudinal direction, and four cranes 3 movably mounted on the main body of the bridge erecting machine. The four cranes are distributed on the longitudinal frames in the longitudinal direction; when in use, the erected bridge segment 5 is supported so that one end of the longitudinal frame is supported on the erected bridge segment and the other end is supported on a foot pier 6 adjacent to the erected bridge segment through the support legs, and then two bridge segments 7 are moved to be butted together and erected on a foot pier adjacent to the erected bridge segment and a bridge pier 8 adjacent to a foot pier of the erected bridge segment adjacent to the erected bridge segment by means of two cranes suspended at both ends of a bridge segment.

[0025] The longitudinal frame is provided with a first longitudinal track 9, two of the four overhead cranes are curved arm overhead cranes 10, and the remaining two overhead cranes are straight arm overhead cranes 11. The curved arm overhead crane comprises a crossbeam 12 movably supported at both ends on the first longitudinal tracks of the two longitudinal frames and two curved arm suspension structures 13 connected to the crossbeam and distributed along the transverse direction of the bridge, and the curved arm suspension structure comprises a suspension seat 14 slidably connected to the crossbeam, a curved arm rotatably suspended on the suspension seat at the upper end, a curved arm portion connection structure 15 rotatably connected to the lower end of the curved arm for connection with the bridge segment, and a hook 16 connected to the crossbeam at the upper end. The curved hanging arm includes an upper vertical section 17 whose upper end is rotatably suspended on a suspension seat, an upper horizontal section 18 whose one end is connected to the lower end of the upper vertical section, a vertical telescopic rod 19 (specifically a cylinder) whose upper end is connected to the other end of the upper horizontal section, a lower horizontal section 20 whose one end is connected to the lower end of the vertical telescopic rod, and a lower vertical section 21 whose upper end is connected to the other end of the lower horizontal section. The curved hanging arm connection structure can be rotatably suspended on the lower end of the lower vertical section. The upper vertical section and the lower vertical section are coaxial, and the upper horizontal section includes a first section 22 whose one end is connected to the lower end of the upper vertical section and a second section 23 whose one end can be plugged and unplugged and connected to the first section. The other end of the second section is connected to the upper end of the vertical telescopic rod; both ends of the crossbeam are provided with a crossbeam driving structure 24. The beam driving structure includes a longitudinal rack of the beam driving structure part arranged on the first longitudinal track, a gear 25 of the beam driving structure part meshing with the longitudinal rack of the beam driving mechanism part, a motor 26 of the beam driving structure part driving the gear of the beam driving structure part, and a balance wheel 27 of the beam driving structure part supported on the first longitudinal track. The beam is connected to the gear of the beam sleeve driving structure part and the balance wheel of the beam driving structure part at the same time. When in use, the gear is driven to rotate by the motor of the beam driving mechanism part to realize the movement of the curved hanging arm overhead crane. The beam is provided with a slide groove 28 extending in the horizontal direction of the bridge, and two suspension seats are slidably suspended in the slide groove, and the two sliders are connected together by a double-headed cylinder 29. When in use, the two curved arm suspension structures are driven to separate and combine by the extension and contraction of the double-headed cylinder so that the upper horizontal section is connected and disconnected. A suspension head 30 is provided at the upper end of the upper vertical section, and the suspension head is supported on the suspension seat through a plane bearing 31. The second segment is a ferromagnetic structure, a connecting transverse hole is provided in the first segment, a permanent magnet 32 ​​is provided in the connecting transverse hole, and the second segment is inserted into the connecting transverse hole. The curved hanging arm connection structure has the same structure as the straight hanging arm connection structure, and outer flanges 33 are provided on both sides of the bridge segment 7. The curved hanging arm connection structure includes an upper hanging plate 34, a lower hanging plate 35, and an end plate 36 that connects one end of the upper and lower hanging plates together, and a bayonet is formed between the other ends of the upper and lower hanging plates. The outer flange is inserted into the bayonet to realize the connection between the curved hanging arm connection structure and the bridge segment.

[0026] The straight-arm overhead crane comprises a straight-arm suspension structure 53 connected to two longitudinal frames in a one-to-one correspondence, the straight-arm suspension structure comprising a longitudinal sliding rod 37, a retractable straight-arm 38 (specifically a cylinder or an oil cylinder) on which the upper end can be slidably suspended on the longitudinal sliding rod, and a straight-arm connection structure 39 connected to the lower end of the straight-arm for connecting to the bridge segment; the hook and the upper vertical section are distributed on both radial sides of the longitudinal sliding rail and the lower ends are both located below the longitudinal sliding rod, and the second segment can be rotated with the upper vertical section as the axis to be hung on the hook When the second segment is hung on the hook, one end of the second segment connected to the first segment is located on the side of the straight hanging arm away from the upper vertical segment. When the curved hanging arm is rotated to a state where the vertical telescopic rod is located between the two straight hanging arms to suspend the bridge segment, the bridge segment suspended by the curved hanging arm can pass between the two straight hanging arms. When the vertical telescopic rod is hung on the hook through the second segment and the straight hanging arm is used to suspend the bridge segment, the bridge segment suspended by the straight hanging arm can pass between the two curved hanging arms. The slide bar is suspended on the longitudinal frame through a plurality of horizontal latches 40 distributed along the longitudinal bridge direction. One end of the horizontal latch is inserted into the longitudinal slide bar, and the other end is inserted into the longitudinal frame. A return spring 41 is sleeved on the horizontal latch to drive the horizontal latch to insert into the longitudinal slide bar. One end of the return spring is connected to the longitudinal frame, and the other end is connected to a stopper 42 on the horizontal latch. Both sides of the longitudinal bridge direction where one end of the horizontal latch is connected to the longitudinal slide bar are provided with pull-out guide slopes 43. The straight hanging arm is suspended on the longitudinal slide bar through a sliding sleeve 44 sleeved on the longitudinal slide bar, and both ends of the sliding sleeve are provided with an extrusion slope 45 for driving the pull-out guide slope to pull the horizontal latch out from the longitudinal slide bar; in the process of the straight hanging arm structure moving forward, the extrusion slope is squeezed onto the pull-out guide slope to pull out the horizontal latch and enable the sliding sleeve to pass over the horizontal latch. After the sliding sleeve passes over the horizontal latch, the horizontal latch is inserted into the longitudinal slide rail under the action of the return spring. The straight arm suspension structure also includes a sleeve driving structure, which includes a second longitudinal track 46 arranged on the longitudinal frame and located below the first longitudinal track, a longitudinal rack 47 of the sleeve driving structure part arranged on the second longitudinal track, a gear 48 of the sleeve driving structure part meshed with the longitudinal rack of the sleeve driving mechanism part, a motor 49 of the sleeve driving structure part driving the gear of the sleeve driving structure part, a balance wheel 50 of the sleeve driving structure part supported on the second longitudinal track, a shift fork 51 connected to the gear of the sleeve driving structure part and the balance wheel of the sleeve driving structure part, and a pull rod 52 inserted in the shift fork, and the pull rod is connected to the sleeve. When in use, the sleeve is moved by rotating the gear driven by the motor of the sleeve driving mechanism part.

[0027] The process of installing the bridge segment is as follows: A. Fix two straight-arm overhead cranes at both ends of a bridge segment to be erected, then move forward to the rear end of the bridge segment to be erected fixed by the straight-arm overhead crane and dock it with the front end of the bridge segment that has been erected; B. Fix two curved-arm overhead cranes at both ends of the next bridge segment to be erected, then move forward to the rear end of the bridge segment to be erected fixed by the curved-arm overhead crane and dock it with the front end of the bridge segment to be erected in step A, and repeat the above steps until all bridge segments are laid; when the straight-arm overhead crane passes between the curved-arm overhead cranes, first use The upper vertical section of the curved hanging arm is used as an axis to rotate to the part of the curved hanging arm located below the second section and is hung on the hook through the second section, and then the upper vertical section is driven to move in the direction away from the hook to the first section and disengage from the second section, and the first section is staggered with the straight hanging arm along the transverse bridge direction, and finally the straight hanging arm overhead crane passes between the curved hanging arm overhead cranes, and the first section and the second section are connected after the straight hanging arm overhead crane passes between the curved hanging arm overhead cranes; when the curved hanging arm overhead crane passes between the straight hanging arm overhead cranes, the upper vertical section of the curved hanging arm is first rotated as an axis to the vertical telescopic rod located on the side of the upper vertical section away from the straight hanging arm, and then the curved hanging arm overhead crane passes between the straight hanging arm overhead cranes. It can make the number of bridge segments located between two piers to be more than three during bridge erection, which is convenient for erecting large-span bridges (when the span is large, one span is divided into multiple bridge segments for construction). When the existing bridge-erecting machine is not equipped with auxiliary supports, the number of overhead cranes must be twice the number of bridge segments between one pier and another. When constructing multiple bridge segments, the large number of overhead cranes not only increases the cost of the bridge-erecting machine but also reduces the efficiency of bridge erection).

Claims

1. A four-crane bridge erecting machine, comprising two longitudinal frames supported on supporting feet and extending in the transverse direction and longitudinal direction, and a crane movably mounted on the bridge erecting machine body, characterized in that: The overhead crane has four parts, and the four overhead cranes are distributed on the longitudinal frame along the longitudinal direction of the bridge. When in use, the erected bridge segment is used as support so that one end of the longitudinal frame is supported on the erected bridge segment and the other end is supported on the pier adjacent to the erected bridge segment through the supporting feet. Then, two overhead cranes are suspended at both ends of a bridge segment to move the two bridge segments to be docked together and erected on the piers adjacent to the piers adjacent to the erected bridge segment and the piers adjacent to the foot piers of the erected bridge segment adjacent to the erected bridge segment.

2. A four-crane bridge erecting machine according to claim 1, characterized in that: The longitudinal frame is provided with a first longitudinal track, two of the four overhead cranes are curved arm overhead cranes, and the remaining two overhead cranes are straight arm overhead cranes, the curved arm overhead cranes include a crossbeam whose two ends are movably supported on the first longitudinal tracks of the two longitudinal frames and two curved arm suspension structures connected to the crossbeam and distributed along the transverse direction of the bridge, the curved arm suspension structure includes a suspension seat slidably connected to the crossbeam, a curved arm whose upper end is rotatably suspended on the suspension seat, a curved arm portion connection structure rotatably connected to the lower end of the curved arm for connection with the bridge segment, and The hook is connected to the cross beam at the upper end, and the curved hanging arm includes an upper vertical section whose upper end is rotatably hung on the hanging seat, an upper cross section whose one end is connected to the lower end of the upper vertical section, a vertical telescopic rod whose upper end is connected to the other end of the upper cross section, a lower cross section whose one end is connected to the lower end of the vertical telescopic rod, and a lower vertical section whose upper end is connected to the other end of the lower cross section. The curved hanging arm connection structure can be rotatably hung on the lower end of the lower vertical section, the upper vertical section and the lower vertical section are coaxial, and the upper cross section includes a first section whose one end is connected to the lower end of the upper vertical section and a first section whose one end can be plugged in and out of the The second segment on the first segment, the other end of the second segment is connected to the upper end of the vertical telescopic rod; the straight-hanging arm overhead crane includes a straight-arm suspension structure connected to the two longitudinal frames in a one-to-one correspondence, the straight-arm suspension structure includes a longitudinal sliding rod, a telescopic straight-hanging arm on the longitudinal sliding rod that can be slidably suspended at the upper end, and a straight-hanging arm connection structure connected to the lower end of the straight-hanging arm for connecting to the bridge segment; the hook and the upper vertical segment are distributed on both sides of the radial direction of the longitudinal sliding rail, and the lower ends are located below the longitudinal sliding rod, and the second segment can be connected to the longitudinal sliding rail. The upper vertical section is rotated about the axis to be hung on the hook. When the second section is hung on the hook, one end of the second section connected to the first section is located on the side of the straight hanging arm away from the upper vertical section. When the curved hanging arm is rotated to a state where the vertical telescopic rod is located between the two straight hanging arms to suspend the bridge section, the bridge section suspended by the curved hanging arm can pass between the two straight hanging arms; when the straight hanging arm is used to suspend the bridge section in a state where the vertical telescopic rod is hung on the hook through the second section, the bridge section suspended by the straight hanging arm can pass between the two curved hanging arms.

3. A four-crane bridge erecting machine according to claim 2, characterized in that: The sliding rod is suspended on the longitudinal frame by a plurality of horizontal pins distributed along the longitudinal bridge direction, one end of the horizontal pin is inserted into the longitudinal sliding rod, and the other end is inserted into the longitudinal frame, and a return spring is sleeved on the horizontal pin to drive the horizontal pin to insert into the longitudinal sliding rod, one end of the return spring is connected to the longitudinal frame, and the other end is connected to the stop block on the horizontal pin, and both sides of the longitudinal bridge direction at one end of the horizontal pin connected to the longitudinal sliding rod are provided with pull-out guide inclined surfaces, and the straight hanging arm is suspended on the longitudinal sliding rod by a sliding sleeve sleeved on the longitudinal sliding rod, and both ends of the sliding sleeve are provided with extrusion inclined surfaces for driving the pull-out guide inclined surfaces to pull the horizontal pin out of the longitudinal sliding rod; in the process of the straight hanging arm structure moving forward, the extrusion inclined surface squeezes the pull-out guide inclined surface to pull out the horizontal pin and enable the sliding sleeve to pass over the horizontal pin, and after the sliding sleeve passes over the horizontal pin, the horizontal pin is inserted into the longitudinal slide rail under the action of the return spring.

4. A four-crane bridge erecting machine according to claim 3, characterized in that: The straight arm suspension structure also includes a sleeve driving structure, which includes a second longitudinal track arranged on the longitudinal frame and located below the first longitudinal track, a longitudinal rack of the sleeve driving structure part arranged on the second longitudinal track, a gear of the sleeve driving structure part meshing with the longitudinal rack of the sleeve driving mechanism part, a motor of the sleeve driving structure part driving the gear of the sleeve driving structure part, a balancing wheel of the sleeve driving structure part supported on the second longitudinal track, a shift fork connected to the gear of the sleeve driving structure part and the balancing wheel of the sleeve driving structure part at the same time, and a pull rod inserted in the shift fork, wherein the pull rod is connected to the sleeve.

5. A four-crane bridge erecting machine according to claim 2, 3 or 4, characterized in that: Both ends of the beam are provided with a beam driving structure, which includes a longitudinal rack of the beam driving structure part arranged on the first longitudinal track, a gear of the beam driving structure part meshing with the longitudinal rack of the beam driving mechanism part, a motor of the beam driving structure part driving the gear of the beam driving structure part, and a balance wheel of the beam driving structure part supported on the first longitudinal track. The beam is simultaneously connected to the gear of the beam sleeve driving structure part and the balance wheel of the beam driving structure part.

6. A four-crane bridge erecting machine according to claim 2, 3 or 4, characterized in that: A suspension head is provided at the upper end of the upper vertical section, and the suspension head is supported on the suspension seat through a plane bearing.

7. A four-crane bridge erecting machine according to claim 2, 3 or 4, characterized in that: The second segment is a ferromagnetic structure, a connecting transverse hole is provided in the first segment, a permanent magnet is provided in the connecting transverse hole, and the second segment is inserted into the connecting transverse hole.

8. A four-crane bridge erecting machine according to claim 2, 3 or 4, characterized in that: The curved arm connection structure and the straight arm connection structure have the same structure, and outward flanges are provided on both sides of the bridge segment. The curved arm connection structure includes an upper suspension plate, a lower suspension plate and an end plate connecting one end of the upper and lower suspension plates together, and a bayonet is formed between the other ends of the upper and lower suspension plates. The outward flange is inserted into the bayonet to realize the connection between the curved arm connection structure and the bridge segment.

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