Split type multifunctional bridge girder erection machine and construction method

Abstract

The invention relates to a split type multifunctional bridge girder erection machine and a construction method, the split type multifunctional bridge girder erection machine comprises a single-girder bridge girder erection machine, the single-girder bridge girder erection machine comprises a bridge girder erection machine girder, the bridge girder erection machine girder is sequentially connected with a front supporting leg, a middle supporting leg and a rear supporting leg from front to back, the middle supporting leg can move front and back along the bridge girder erection machine girder, and the bridge girder erection machine girder is slidably connected with a front hoisting crown block and a rear hoisting crown block; the movable tower crane comprises a rubber-tyred base, the top of the rubber-tyred base is vertically connected with a telescopic steel framework formed by sequentially heightening a plurality of steel structure sections, the top of the telescopic steel framework is connected with a cantilever hanging bracket, and the cantilever hanging bracket is connected with a hanging tool. By means of mutual cooperation of the single-girder bridge erecting machine and the movable tower crane, erecting operation of prefabricated pier columns, prefabricated cover beams and prefabricated girders can be carried out at the same time, and one-machine installation of multiple components of an urban assembly type bridge is achieved. By controlling the longitudinal front-back movement of the middle supporting leg and connecting the middle supporting leg with the movable tower crane, the whole operation of getting on and off the bridge and the hole crossing operation of the single-girder bridge erecting machine are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a split-type multifunctional bridge erecting machine and a construction method. Background Art

[0002] Bridge assembly construction has become an important development direction for bridge construction due to its advantages of small land occupation, fast construction speed and little traffic interference. In urban bridge construction, due to interference factors such as urban traffic, existing structures, pipeline demolition and modification, there are problems such as narrow site, dense breakpoints and discontinuous erection during the construction process.

[0003] Traditional bridge erection machines are large in size and difficult to erect small-radius ramp bridges, and have poor adaptability to urban environments. Faced with construction conditions with dense breakpoints and discontinuous erection, the transfer of bridge erection machines requires the assistance of other large-scale lifting and hoisting equipment for operations such as bridge loading and unloading, installation and disassembly, which not only wastes time and increases project costs, but also occupies a large amount of vehicle traffic space, posing a high safety risk.

[0004] In terms of function, traditional bridge erection machines can only erect main beams, while bridge piers, cap beams, etc. are mostly constructed by cast-in-place method, which takes a long construction period. The structure of bridge erection machines that can erect piers, cap beams and main beams at the same time is large and complex, and the transfer installation and disassembly time is long, which makes it difficult to adapt to the urban environment that requires frequent transfer.

[0005] In view of this, there is an urgent need to improve the existing bridge-building machines and construction methods to adapt to the needs of prefabricated bridge construction in complex urban environments and improve the efficiency of urban bridge construction. Summary of the invention

[0006] The embodiment of the present application provides a split-type multifunctional bridge-building machine and a construction method to solve the problem in the related art that the traditional bridge-building machine needs other large-scale lifting and hoisting equipment to assist in operations such as raising and lowering bridges, assembling and disassembling, and it not only has the problem of erecting piers and cap beams.

[0007] A first aspect of an embodiment of the present application provides a split multifunctional bridge erecting machine, comprising:

[0008] A single-girder bridge erecting machine, the single-girder bridge erecting machine comprises a bridge erecting machine main girder, the bridge erecting machine main girder is sequentially connected with a front support leg, a middle support leg and a rear support leg from front to back, the middle support leg can move forward and backward along the bridge erecting machine main girder, and a front crane and a rear crane are slidably connected to the bridge erecting machine main girder;

[0009] A mobile tower crane comprises a tire-type base, the top of which is vertically connected to a retractable steel frame consisting of multiple steel structure segments connected in sequence, the top of which is connected to a cantilever hanger, and the cantilever hanger is connected to a sling.

[0010] In some embodiments: the front outrigger comprises a first outrigger cross beam fixed to the front end of the main beam of the bridge erecting machine, both ends of the first outrigger cross beam are connected to first supporting columns, and the bottom of the first supporting column is connected to a first running wheel;

[0011] The middle leg comprises a second leg cross beam slidably connected to the top of the main beam of the bridge erecting machine, the two ends of the second leg cross beam are connected to the second supporting columns, and the bottom of the second supporting column is connected to the second running wheel.

[0012] The rear support leg comprises a third support leg cross beam fixed to the rear end of the main beam of the bridge erecting machine, both ends of the third support leg cross beam are connected to third supporting columns, and the bottom of the third supporting column is connected to a third running wheel.

[0013] In some embodiments: the first support column and the second support column are composed of a plurality of lattice-type telescopic columns connected in sequence, and the bottoms of the first support column and the second support column are both provided with a quick connection device for connecting to a mobile tower crane;

[0014] The top of the first supporting column is rotatably connected to the first leg beam 401, the top of the second supporting column is rotatably connected to the second leg beam, and the top of the third supporting column is rotatably connected to the third leg beam.

[0015] In some embodiments: the main beam of the bridge erecting machine comprises a plurality of detachably connected main beam segments, the plurality of main beam segments are sequentially extended to form the main beam of the bridge erecting machine, the top of the main beam of the bridge erecting machine is provided with an upper slide rail slidably connected to the middle leg, and the bottom top of the main beam of the bridge erecting machine is provided with a lower slide rail slidably connected to the front crane trolley and the rear crane trolley;

[0016] A rotating mechanism rotatably connected to a tire-type base is provided at the bottom of the telescopic steel frame, and the telescopic steel frame can pitch and rotate relative to the tire-type base with the rotating mechanism as a rotating axis.

[0017] A second aspect of the embodiment of the present application provides a construction method of a split-type multifunctional bridge-building machine, the method using the split-type multifunctional bridge-building machine described in any one of the above embodiments, the method comprising the following steps:

[0018] Transport the single-girder bridge erecting machine to the construction site and place it along the longitudinal bridge towards the side close to the pier body;

[0019] The mobile tower crane is transported to the construction site, and the mobile tower crane is lifted from the side of the single-girder bridge erecting machine to lift the single-girder bridge erecting machine;

[0020] When the single-girder bridge-erecting machine is lifted to the designed height, the front legs, middle legs and rear legs are rotated to the supporting state, and the single-girder bridge-erecting machine is lowered to the erection position.

[0021] In some embodiments, the mobile tower crane lifts the single-girder bridge erecting machine from the side of the single-girder bridge erecting machine, specifically comprising the following steps:

[0022] Use two mobile tower cranes and move them to the side of the single-girder bridge erecting machine, drive the tire-type base to move, so that the tire-type base is located under the single-girder bridge erecting machine, and the cantilever hanger uses the lifting device to lift the single-girder bridge erecting machine and remove the transport vehicle at the bottom of the single-girder bridge erecting machine;

[0023] Two mobile tower cranes move in coordination to lift the single-girder bridge-erecting machine to the top of the erected pier, and the front, middle and rear legs of the bridge-erecting machine are adjusted to a supporting state. The single-girder bridge-erecting machine is lowered by the hoist and supported on the erected cap beam.

[0024] In some embodiments: the method further comprises:

[0025] Use two transport vehicles set up front and back to transport the prefabricated main beam to the lifting position of the front crane on the erected main beam;

[0026] The front crane hoists and lifts the front end of the precast main beam, so that the front end of the precast main beam is supported on the front crane, and the rear end of the precast main beam is supported on the rear transport vehicle;

[0027] The front transport vehicle is removed, and the front crane and the rear transport vehicle synchronously move the prefabricated main beam longitudinally, so that the prefabricated main beam is longitudinally moved to the lifting position of the rear crane;

[0028] The rear hoisting crane lifts the rear end of the prefabricated main beam, so that the prefabricated main beam is completely suspended and supported on the front hoisting crane and the rear hoisting crane of the single-girder bridge erecting machine;

[0029] The front crane and the rear crane move longitudinally synchronously to move the prefabricated main beam to the designed position to be installed, and the front crane and the rear crane lower the prefabricated main beam for installation;

[0030] After the installation of the prefabricated main beam is completed, the single-beam bridge-erecting machine is moved horizontally as a whole, and the above steps are repeated to install the next prefabricated main beam.

[0031] In some embodiments: the method further comprises:

[0032] After the erection of one prefabricated main beam is completed, the support state of the single-main-beam bridge erecting machine is adjusted so that the single-main-beam bridge erecting machine is supported by the front legs and the rear legs. After the middle legs are vacated, they are longitudinally moved forward along the main beam of the bridge erecting machine to the front end of the erected main beam.

[0033] Adjust the supporting state of the single-girder bridge erecting machine. The single-girder bridge erecting machine is supported by the middle outrigger and the rear outrigger. After the front outrigger is vacated, the single-girder bridge erecting machine moves forward longitudinally as a whole. The front outrigger is in a suspended state and is located outside the front end of the erected main girder.

[0034] driving the first mobile tower crane to move to the position of the front outriggers, adjusting the height of the first mobile tower crane to support the front outriggers, so that the front outriggers support and are fixed on the retractable steel frame of the first mobile tower crane;

[0035] Adjust the supporting state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs and the middle legs, and drive the first mobile tower crane and the single-girder bridge erecting machine to move forward longitudinally together until the first mobile tower crane is moved to the vicinity of the next erected pier;

[0036] Adjust the supporting state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs and the rear legs. After the middle legs are vacated, they are longitudinally moved forward along the main beam of the bridge erecting machine to the front end of the erected main beam. The middle legs are in a suspended state and are located outside the front end of the erected main beam.

[0037] Driving the second mobile tower crane to move to the position of the middle outrigger, adjusting the height of the second mobile tower crane to support the middle outrigger, so that the middle outrigger supports and is fixed on the retractable steel frame of the second mobile tower crane;

[0038] Adjust the supporting state of the single-girder bridge erecting machine so that it is supported by the middle legs and the rear legs, disconnect the front legs from the first mobile tower crane, and move the single-girder bridge erecting machine forward so that the front legs are supported above the next erected pier;

[0039] Adjust the supporting status of the single-girder bridge-erecting machine so that the single-girder bridge-erecting machine is supported by the front legs and the rear legs, detach the connection between the middle legs and the second mobile tower crane, and move the middle legs longitudinally backward to the hoisting position of the prefabricated main beam to be erected. The single-girder bridge-erecting machine completes the through-hole operation.

[0040] In some embodiments: the method further comprises:

[0041] After the single-girder bridge erection machine has completed the erection of all prefabricated main beams, the single-girder bridge erection machine is moved horizontally to the side beam position;

[0042] Use two mobile tower cranes and move them to the side of the single-girder bridge erecting machine. After the cantilever hanger uses the hoist to lift the single-girder bridge erecting machine, adjust the front legs, middle legs and rear legs to the folded state;

[0043] Two mobile tower cranes move in coordination to lift the single-girder bridge-erecting machine from the side beam to the transport vehicle, and the transport vehicle drives the single-girder bridge-erecting machine away from the construction site.

[0044] In some embodiments, the following steps are also included before transporting the single-girder bridge erecting machine to the construction site:

[0045] Two transport vehicles arranged front and back are used to transport the prefabricated pier columns to be installed to the pier positions on the ground;

[0046] Coordinated control of the transport vehicle and the mobile tower crane so that the front end of the prefabricated pier is located in the middle of the tire-type base of the mobile tower crane;

[0047] The mobile tower crane lowers the lifting device to lift the prefabricated pier and removes the transport vehicle near the front of the mobile tower crane;

[0048] As the hoist gradually lifts the prefabricated pier column, the transport vehicle located at the rear end of the prefabricated pier column moves forward slowly and synchronously to assist the prefabricated pier column in turning over and lifting;

[0049] After the prefabricated pier column is converted from a horizontal state to a vertical state, the rear transport vehicle is removed after the rear transport vehicle is separated from the prefabricated pier column;

[0050] The mobile tower crane is driven to rotate or move to transport the prefabricated pier column to be installed to the designed pier position and then falls down to install the prefabricated pier column.

[0051] In some embodiments, the following steps are also included before transporting the single-girder bridge erecting machine to the construction site:

[0052] Two transport vehicles arranged front and rear are used to transport the prefabricated cap beam to be installed to the pier position on the ground;

[0053] Drive two mobile tower cranes to move to the side of the prefabricated cap beam and arrange them at intervals, so that the tire-type base of the mobile tower crane moves to the bottom of the prefabricated cap beam;

[0054] Two mobile tower cranes use hoists to simultaneously lift the prefabricated cap beam to the set height and remove the two transport vehicles set up in front and behind;

[0055] The two mobile tower cranes are controlled in a coordinated manner to transport the prefabricated cap beam to be installed to the designed pier position by rotating or moving the prefabricated cap beam and then lower it to install the prefabricated cap beam.

[0056] The beneficial effects of the technical solution provided by this application include:

[0057] The embodiment of the present application provides a split-type multifunctional bridge-building machine and a construction method. Since the split-type multifunctional bridge-building machine of the present application is provided with a single-main-beam bridge-building machine, the single-main-beam bridge-building machine includes a bridge-building machine main beam, and the bridge-building machine main beam is sequentially connected with a front support leg, a middle support leg and a rear support leg from front to rear, and the middle support leg can move forward and backward along the bridge-building machine main beam, and a front lifting trolley and a rear lifting trolley are slidably connected to the bridge-building machine main beam; a mobile tower crane includes a tire-type base, and a retractable steel frame composed of multiple steel structure segments connected in sequence is vertically connected to the top of the tire-type base, and a cantilever hanger is connected to the top of the retractable steel frame, and a sling is connected to the cantilever hanger.

[0058] Therefore, the split multifunctional bridge-erecting machine of the present application utilizes the cooperation between the single-girder bridge-erecting machine and the mobile tower crane to simultaneously carry out the erection operations of prefabricated piers, prefabricated cap beams, and prefabricated main beams, thereby realizing the installation of multiple components of urban prefabricated bridges with one machine. The main beam of the bridge-erecting machine adopts a segmented design, which can be quickly segmented and connected. At the same time, the main beam sections can be increased according to the span of the bridge, and it can adapt to bridges with different spans. By controlling the longitudinal forward and backward movement of the middle leg and the connection with the mobile tower crane, the overall upper and lower bridge operations and cross-hole operations of the single-girder bridge-erecting machine are realized. After the single-girder bridge-erecting machine is lowered from the bridge, it can be disassembled on site and quickly transferred to another site with the help of a transport vehicle based on the detachable setting of the main beam of the bridge-erecting machine, thereby meeting the construction needs of prefabricated bridges in complex urban environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0060] Figure 1 This is a structural schematic diagram of a split-type multifunctional bridge erecting machine according to an embodiment of the present application;

[0061] Figure 2 This is a schematic structural diagram of the front legs of an embodiment of the present application;

[0062] Figure 3 This is a schematic diagram of the structure of the supporting legs in the embodiment of the present application;

[0063] Figure 4 This is a schematic diagram of the structure of the rear legs of an embodiment of the present application;

[0064] Figure 5 This is a schematic diagram of step S11 when the single-girder bridge erecting machine is on the bridge according to an embodiment of the present application;

[0065] Figure 6 This is a schematic diagram of step S12 when the single-girder bridge erecting machine is on the bridge according to an embodiment of the present application;

[0066] Figure 7 This is a schematic diagram of step S13 when the single-girder bridge erecting machine is on the bridge according to an embodiment of the present application;

[0067] Figure 8 This is a schematic diagram of step S14 when the single-main-beam bridge erecting machine of the embodiment of the present application installs a prefabricated main beam;

[0068] Fig. 9 This is a schematic diagram of step S15 when the single-main-beam bridge erecting machine of the embodiment of the present application installs a prefabricated main beam;

[0069] Fig.10 This is a schematic diagram of step S16 when the single-main-beam bridge erecting machine of the embodiment of the present application installs a prefabricated main beam;

[0070] Fig.11 This is a schematic diagram of step S17 when the single-main-beam bridge erecting machine of the embodiment of the present application installs a prefabricated main beam;

[0071] Fig.12 This is a schematic diagram of step S18 when the single-main-beam bridge erecting machine of the embodiment of the present application installs a prefabricated main beam;

[0072] Fig.13 This is a schematic diagram of step S19 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0073] Fig.14 This is a schematic diagram of step S20 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0074] Fig.15 This is a schematic diagram of step S21 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0075] Fig.16 This is a schematic diagram of step S22 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0076] Fig.17 This is a schematic diagram of step S23 when the single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0077] Fig.18 This is a schematic diagram of step S24 when the single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0078] Fig.19 This is a schematic diagram of step S25 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0079] Fig. 20 and Fig.21 This is a schematic diagram of step S26 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0080] Fig. 22 This is a schematic diagram of step S27 when the single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0081] Fig.23 This is a schematic diagram of step S28 when a single-girder bridge erecting machine passes through a hole in an embodiment of the present application;

[0082] Fig.24 This is a schematic diagram of step S32 when a mobile tower crane is used to install a prefabricated pier column in an embodiment of the present application;

[0083] Fig.25 This is a schematic diagram of steps S33 to S35 when a mobile tower crane is used to install a prefabricated pier in an embodiment of the present application;

[0084] Fig.26 This is a schematic diagram of step S36 when a mobile tower crane is used to install a prefabricated pier column in an embodiment of the present application;

[0085] Fig. 27 This is a front view of step S37 when the mobile tower crane is installing the prefabricated pier column in the embodiment of the present application;

[0086] Fig.28 This is a top view of step S37 when the mobile tower crane is installing the prefabricated pier column in the embodiment of the present application;

[0087] Fig.29 This is a schematic diagram of step S38 when a mobile tower crane is used to install a prefabricated pier column in an embodiment of the present application;

[0088] Fig.30 This is a schematic diagram of step S39 when a mobile tower crane is used to install a prefabricated cap beam in an embodiment of the present application;

[0089] Fig.31 This is a front view of steps S40 to S42 when a mobile tower crane is used to install a prefabricated cap beam in an embodiment of the present application;

[0090] Fig.32 It is a top view of steps S40 to S42 when the mobile tower crane is installing the prefabricated cap beam in the embodiment of the present application;

[0091] Fig.33 This is a schematic diagram of step S43 when a mobile tower crane is used to install a prefabricated cap beam in an embodiment of the present application.

[0092] Reference numerals:

[0093] 101. Main beam of bridge erecting machine; 102. Front outrigger; 103. Middle outrigger; 104. Rear outrigger; 105. Front crane; 106. Rear crane; 107. Quick connection device; 201. Tire-type base; 202. Retractable steel frame; 203. Cantilever hanger; 204. Hoist; 401. First outrigger crossbeam; 402. First supporting column; 403. First running wheel; 404. Second supporting column; 405. Second outrigger crossbeam; 406. Second running wheel; 407. Third supporting column; 408. Third outrigger crossbeam; 409. Third running wheel; 11. Erected main beam; 12. Erected piers; 13. Erected cap beam; 14. Prefabricated main beam; 15. Prefabricated piers; 16. Prefabricated cap beam; 17. Transport vehicle. DETAILED DESCRIPTION

[0094] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0095] The embodiments of this application provide a split-type multi-functional bridge erecting machine and a construction method, which can solve the problems in the related art that traditional bridge erecting machines require other large-scale lifting and hoisting equipment to assist in operations such as getting on and off the bridge, installation, and disassembly during the transfer process, and not only have the problem of erecting pier columns and capping beams.

[0096] See Figures 1 to 4 As shown in the figure, the first aspect of the embodiments of this application provides a split-type multi-functional bridge erecting machine, including:

[0097] A single-girder bridge erecting machine, which includes a bridge erecting machine main girder 101. A front leg 102, a middle leg 103, and a rear leg 104 are sequentially connected to the bridge erecting machine main girder 101 from front to back. The middle leg 103 can move back and forth along the bridge erecting machine main girder 101. A front lifting trolley 105 and a rear lifting trolley 106 are slidably connected to the bridge erecting machine main girder 101. The front leg 102, the middle leg 103, and the rear leg 104 are used to support the bridge erecting machine main girder 101 and span the bridge erecting machine main girder 101 across the erected pier columns 12 and the erected main girders 11. The front lifting trolley 105 and the rear lifting trolley 106 are used to lift and transport precast main girders 14.

[0098] A mobile tower crane, which includes a tire-type base 201. A telescopic steel framework 202 composed of multiple steel structure segments connected in sequence is vertically connected to the top of the tire-type base 201. A cantilever hanger 203 is connected to the top of the telescopic steel framework 202. A lifting tool 204 is connected to the cantilever hanger 203. The tire-type base 201, the telescopic steel framework 202, and the cantilever hanger 203 together form a "C"-shaped structure. The mobile tower crane can move by itself and use the lifting tool 204 on the cantilever hanger 203 to lift and move and install precast pier columns 15 and precast capping beams 16.

[0099] The split multifunctional bridge erection machine of the embodiment of the present application utilizes the cooperation between the single-girder bridge erection machine and the mobile tower crane to simultaneously carry out the erection operations of the prefabricated piers 15, the prefabricated cap beams 16, and the prefabricated main beams 14, thereby realizing the installation of multiple components of urban prefabricated bridges by one machine. The single-girder bridge erection machine realizes the overall bridge-up and down-bridge operations and cross-hole operations of the single-girder bridge erection machine by controlling the longitudinal forward and backward movement of the middle support leg 103 and the connection with the mobile tower crane. After the single-girder bridge erection machine is lowered from the bridge, the transport vehicle 17 can be used to realize the on-site disassembly and rapid transfer transportation of the single-girder bridge erection machine based on the detachable setting of the bridge erection machine main beam 101, thereby meeting the construction needs of prefabricated bridges in complex urban environments.

[0100] In some alternative embodiments: See Figures 2 to 4 As shown, the embodiment of the present application provides a split multifunctional bridge erecting machine, wherein the front leg 102 of the split multifunctional bridge erecting machine includes a first leg cross beam 401 fixed to the front end of the bridge erecting machine main beam 101, and the first leg cross beam 401 is connected to the first supporting column 402 at both ends, and the bottom of the first supporting column 402 is connected to the first running wheel 403. The first leg cross beam 401 and the first supporting column 402 together form a "door" shaped structure.

[0101] The middle leg 103 includes a second leg cross beam 405 slidably connected to the top of the bridge erecting machine main beam 101, and the two ends of the second leg cross beam 405 are connected to the second support column 404, and the bottom of the second support column 404 is connected to the second running wheel 406. The second support column 404 and the second leg cross beam 405 together form a "door" shaped structure. The second leg cross beam 405 is slidably connected to the top of the bridge erecting machine main beam 101, so that the middle leg 103 has the ability to move longitudinally forward and backward along the bridge erecting machine main beam 101, and assist the single-main beam bridge erecting machine to pass through holes and cross obstacles.

[0102] The rear outrigger 104 includes a third outrigger cross beam 408 fixed to the rear end of the bridge erecting machine main beam 101, and the third support columns 407 are connected to both ends of the third outrigger cross beam 408, and the third running wheel 409 is connected to the bottom of the third support column 407. The third support column 407 and the third outrigger cross beam 408 together form a "door"-shaped structure, and the first running wheel 403, the second running wheel 406 and the third running wheel 409 all have steering and locking functions to realize the longitudinal and transverse movement operation of the single-girder bridge erecting machine.

[0103] The first support column 402 and the second support column 404 are both composed of multiple lattice telescopic columns connected in sequence, and the lattice telescopic columns are used to enhance the stability of the first support column 402 and the second support column 404 and reduce their own gravity. The first support column 402 and the second support column 404 can lift or lower the first running wheel 403 and the second running wheel 406 through telescopic movement, and the first running wheel 403 and the second running wheel 406 are placed on the top of the erected pier column 12 or the erected main beam 11.

[0104] The bottom of the first support column 402 and the second support column 404 are both provided with a quick connection device 107 for connecting to a mobile tower crane. After the quick connection device 107 is quickly connected to the top of the retractable steel frame 202 of the mobile tower crane, the single-girder bridge erecting machine is supported to assist the single-girder bridge erecting machine in hole-passing operations and crossing obstacles. The top of the first support column 402 is rotatably connected to the first leg crossbeam 401, the top of the second support column 404 is rotatably connected to the second leg crossbeam 405, and the top of the third support column 407 is rotatably connected to the third leg crossbeam 408. During transfer and transportation, the front legs 102, the middle legs 103, and the rear legs 104 can be converted from a vertical support state to a horizontal folding state, thereby reducing the overall height of the single-girder bridge erecting machine for easy transportation.

[0105] In some alternative embodiments: See Figures 2 to 4 As shown, the embodiment of the present application provides a split multifunctional bridge erecting machine, the main beam 101 of the split multifunctional bridge erecting machine includes multiple detachably connected main beam segments, and the multiple main beam segments are sequentially extended to form the main beam 101 of the bridge erecting machine. The main beam 101 of the bridge erecting machine adopts a segmented design, which can be quickly segmented and connected, and the length is 1.5 times the length of the prefabricated main beam 14. At the same time, the main beam segments can be increased according to the span of the bridge, and can adapt to bridges with different spans.

[0106] The top of the bridge erection machine main beam 101 is provided with an upper slide rail slidably connected to the middle leg 103, and the bottom top of the bridge erection machine main beam 101 is provided with a lower slide rail slidably connected to the front crane 105 and the rear crane 106. The second leg cross beam 405 of the middle leg 103 is slidably connected to the upper slide rail at the top of the bridge erection machine main beam 101, and the front crane 105 and the rear crane 106 are slidably connected to the lower slide rail at the bottom of the bridge erection machine main beam 101, so that the middle leg 103, the front crane 105 and the rear crane 106 move longitudinally on the bridge erection machine main beam 101 without interfering with each other.

[0107] The bottom of the retractable steel frame 202 is provided with a rotating mechanism that is rotatably connected to the tire-type base 201. The retractable steel frame 202 pitches and rotates relative to the tire-type base 201 with the rotating mechanism as the rotating axis. When the mobile tower crane needs to be transferred, the height of the retractable steel frame 202 can be lowered first, and then laid flat around the rotating mechanism to meet the height limit requirements of urban road transportation. The retractable steel frame 202 is detachably connected to the cantilever hanger 203. When the retractable steel frame 202 and the tire-type base 201 are used to support the front leg 102 or the middle leg 103, or when the mobile tower crane is transferred and transported.

[0108] See also Figures 5 to 7 As shown, the second aspect of the embodiment of the present application provides a construction method of a split-type multifunctional bridge-building machine, the method using the split-type multifunctional bridge-building machine described in any of the above embodiments, the method comprising the following bridge construction steps:

[0109] S11, use two transport vehicles 17 to transport the single-girder bridge erecting machine as a whole to the construction site, so that the single-girder bridge erecting machine is moved along the longitudinal bridge to the side close to the pier 12 that has been erected, and the jack on the transport vehicle 17 is used to lift the single-girder bridge erecting machine to a set height, such as Figure 5 shown.

[0110] S12, use two mobile tower cranes and move them to the side of the single-girder bridge erecting machine, drive the tire-type base 201 to move, so that the tire-type base 201 is located below the single-girder bridge erecting machine, the cantilever hanger 203 uses the lifting device 204 to lift the single-girder bridge erecting machine, and remove the transport vehicle 17 at the bottom of the single-girder bridge erecting machine, such as Figure 6 shown.

[0111] S13, two mobile tower cranes move horizontally in coordination to lift the single-girder bridge erecting machine to the top of the erected pier 12, adjust the front legs 102, middle legs 103 and rear legs 104 of the bridge erecting machine from the horizontal state to the vertical support state, and lower the single-girder bridge erecting machine with the hoist 204 to support it on the erected cap beam 13 and the erected main beam 11, see Figure 7 shown.

[0112] In some alternative embodiments: See Figures 8 to 12 As shown, the embodiment of the present application provides a construction method of a split multifunctional bridge erecting machine, and the construction method also includes the following steps of erecting a prefabricated main beam 14:

[0113] S14, using two transport vehicles 17 arranged front and rear on the erected main beam 11 to transport the prefabricated main beam 14 to the lifting position of the front crane 105, the front crane 105 lifts the front end of the prefabricated main beam 14, so that the front end of the prefabricated main beam 14 is supported on the front crane 105, and the rear end of the prefabricated main beam 14 is supported on the rear transport vehicle 17, see Figure 8shown.

[0114] S15, remove the transport vehicle 17 at the front end of the prefabricated main beam 14, and the front crane 105 and the transport vehicle 17 at the rear end of the prefabricated main beam 14 synchronously move the prefabricated main beam 14 longitudinally, so that the prefabricated main beam 14 moves longitudinally to the lifting position of the rear crane 106, see Fig. 9 shown.

[0115] S16, the rear crane 106 lifts the rear end of the prefabricated main beam 14, so that the prefabricated main beam 14 is completely suspended and supported on the front crane 105 and the rear crane 106 of the single-beam bridge erecting machine, and the transport vehicle 17 at the rear end of the prefabricated main beam 14 is removed, see Fig.10 shown.

[0116] S17, the front crane 105 and the rear crane 106 move longitudinally synchronously, so that the prefabricated main beam 14 moves longitudinally to the designed position to be installed, and the front crane 105 and the rear crane 106 lower the prefabricated main beam 14, and install the prefabricated main beam 14 on the erected cap beam 13, see Fig.11 shown.

[0117] S18. When the first prefabricated main beam 14 is installed, the single main beam bridge erecting machine moves horizontally as a whole, and repeats the above steps S14 to S17 to install the next prefabricated main beam 14 until all the prefabricated main beams 14 of the bridge are erected. Fig.12 shown.

[0118] In some alternative embodiments: See Figures 13 to 23 As shown, the embodiment of the present application provides a construction method of a split multifunctional bridge erecting machine, and the construction method also includes the following single main beam bridge erecting machine through-hole construction steps:

[0119] S19. After the erection of one prefabricated main beam 14 is completed, the support state of the single-main-beam bridge erecting machine is adjusted so that the single-main-beam bridge erecting machine is supported on the top of the erected main beam 11 by the front legs 102 and the rear legs 104. Fig.13 shown.

[0120] S20, lift the middle leg 103 upward, and after the middle leg 103 is clear of the erected main beam 11, move longitudinally forward along the main beam 101 of the bridge erecting machine to the front end of the erected main beam 11, see Fig.14 shown.

[0121] S21, adjust the support state of the single-girder bridge erecting machine. The single-girder bridge erecting machine is supported by the middle legs 103 and the rear legs 104 on the top of the erected main beam 11. After the front legs 102 are vacated, the single-girder bridge erecting machine moves forward longitudinally as a whole. The front legs 102 are in a suspended state and are located outside the front end of the erected main beam 11. See Fig.15 shown.

[0122] S22, drive the first mobile tower crane to move to the position of the front legs 102, adjust the height and position of the first mobile tower crane, and use the quick connection device 107 to connect and support the front legs 102, so that the front legs 102 support and are fixed on the retractable steel frame 202 of the first mobile tower crane, see Fig.16 shown.

[0123] S23, adjust the support state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs 102 and the middle legs 103, and drive the first mobile tower crane and the single-girder bridge erecting machine to move forward longitudinally together until the first mobile tower crane is moved to the vicinity of the next erected pier 12, see Fig.17 shown.

[0124] S24, adjust the support state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs 102 and the rear legs 104, and the middle legs 103 are vacated and move forward longitudinally along the main beam 101 of the bridge erecting machine to the front end of the erected main beam 11, and the middle legs 103 are in a suspended state and are located outside the front end of the erected main beam 11, see Fig.18 shown.

[0125] S25, drive the second mobile tower crane to move to the position of the middle leg 103, adjust the height and position of the second mobile tower crane, and use the quick connection device 107 to connect and support the middle leg 103, so that the middle leg 103 supports and is fixed on the retractable steel frame 202 of the second mobile tower crane, see Fig.19 shown.

[0126] S26, adjust the support state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the middle leg 103 and the rear leg 104, disconnect the front leg 102 from the first mobile tower crane, and move the single-girder bridge erecting machine forward so that the front leg 102 is supported above the next erected pier 12, see Fig. 20 and Fig.21 shown.

[0127] S27, adjust the support state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs 102 and the rear legs 104, and the connection between the aerial legs 103 and the second mobile tower crane is disconnected, see Fig. 22 As shown;

[0128] S28, the middle leg 103 moves longitudinally backward to the hoisting position of the prefabricated main beam 14 to be erected, and the single main beam bridge erection machine completes the hole-passing operation, see Fig.23 shown.

[0129] In some optional embodiments: The embodiment of the present application provides a construction method of a split multifunctional bridge erecting machine, and the construction method also includes the following single main beam bridge erecting machine bridge lowering construction steps:

[0130] S29. After the single-girder bridge erecting machine has completed the erection of all prefabricated main beams 14, the single-girder bridge erecting machine is moved horizontally to the side beam position.

[0131] S30, use two mobile tower cranes and move them to the side of the single-girder bridge erecting machine, after the cantilever hanger 203 uses the hoist 204 to lift the single-girder bridge erecting machine, adjust the front legs 102, the middle legs 103 and the rear legs 104 to the retracted and folded state.

[0132] S31. Two mobile tower cranes move in coordination to lift the single-girder bridge erecting machine from the side beam to the transport vehicle 17, and the transport vehicle 17 drives the single-girder bridge erecting machine away from the construction site as a whole.

[0133] In some alternative embodiments: See Figure 24 to Figure 29 As shown, the embodiment of the present application provides a construction method of a split multifunctional bridge erecting machine, the construction method also includes a prefabricated pier column 15 construction step, the prefabricated pier column 15 construction step is preferably before the single main beam bridge erecting machine is transported to the construction site, the prefabricated pier column 15 construction step includes:

[0134] S32, using two transport vehicles 17 arranged in front and behind to transport the prefabricated pier column 15 to be installed to the pier position on the ground, see Fig.24 shown.

[0135] S33, cooperatively control the transport vehicle 17 and the mobile tower crane so that the front end of the prefabricated pier column 15 is located in the middle position of the tire-type base 201 of the mobile tower crane.

[0136] S34, the mobile tower crane lowers the lifting device 204 to lift the prefabricated pier 15, and moves away the transport vehicle 17 near the front of the mobile tower crane.

[0137] S35, as the hoist 204 gradually lifts the prefabricated pier column 15, the transport vehicle 17 located at the rear of the rear end of the prefabricated pier column 15 moves forward slowly and synchronously to assist the prefabricated pier column 15 in turning over and lifting. Fig.25 shown.

[0138] S36, after the prefabricated pier 15 is converted from a horizontal state to a vertical state, the rear transport vehicle 17 is removed after it is separated from the prefabricated pier 15, see Fig.26 shown.

[0139] S37, driving the mobile tower crane to rotate or move, transporting the prefabricated pier column 15 to be installed to the designed pier position and dropping it, see Fig. 27 and Fig.28 As shown;

[0140] S38. Install the prefabricated pier column 15 at the designed pier position with the assistance of a mobile tower crane. Fig.29 shown.

[0141] In some alternative embodiments: See Figure 30 to Figure 33 As shown, the embodiment of the present application provides a construction method of a split multifunctional bridge erecting machine, the construction method also includes a construction step of prefabricating a cap beam 16, the construction step of prefabricating a cap beam 16 is preferably before the single main beam bridge erecting machine is transported to the construction site, the construction step of prefabricating a cap beam 16 includes:

[0142] S39, using two transport vehicles 17 arranged in front and behind to transport the prefabricated cap beam 16 to be installed to the pier position on the ground, see Fig.30 shown.

[0143] S40, driving two mobile tower cranes to move to the side of the prefabricated cap beam 16 and arrange them at intervals, so that the tire-type base 201 of the mobile tower crane moves to the bottom of the prefabricated cap beam 16.

[0144] S41. Two mobile tower cranes use the hoisting device 204 to simultaneously lift the prefabricated cap beam 16 to a set height, and move away the two transport vehicles 17 set in front and behind.

[0145] S42, coordinately control the two mobile tower cranes to rotate or move the prefabricated cap beam 16 so that the prefabricated cap beam 16 is rotated from the longitudinal bridge arrangement to the transverse bridge arrangement, see Fig.31 and Fig.32 shown.

[0146] S43, two mobile tower cranes transport the prefabricated cap beam 16 to be installed to the designed pier position and lower it, and install the prefabricated cap beam 16 above the erected pier column 12, see Fig.33 shown.

[0147] How it works

[0148] The embodiment of the present application provides a split-type multifunctional bridge-building machine and a construction method. Since the split-type multifunctional bridge-building machine of the present application is provided with a single-main-beam bridge-building machine, the single-main-beam bridge-building machine includes a bridge-building machine main beam 101, and the bridge-building machine main beam 101 is connected with a front support leg 102, a middle support leg 103 and a rear support leg 104 in sequence from front to rear, and the middle support leg 103 can move forward and backward along the bridge-building machine main beam 101, and a front lifting trolley 105 and a rear lifting trolley 106 are slidably connected to the bridge-building machine main beam 101; a mobile tower crane includes a tire-type base 201, and the top of the tire-type base 201 is vertically connected with a retractable steel frame 202 composed of multiple steel structure segments connected in sequence, and the top of the retractable steel frame 202 is connected with a cantilever hanger 203, and the cantilever hanger 203 is connected with a sling 204.

[0149] Therefore, the split multifunctional bridge erection machine of the present application can simultaneously carry out the erection operations of prefabricated piers 15, prefabricated cap beams 16, and prefabricated main beams 14 by using the single-girder bridge erection machine and the mobile tower crane in cooperation with each other, so as to realize the installation of multiple components of urban prefabricated bridges by one machine. The main beam 101 of the bridge erection machine adopts a segmented design, which can be quickly segmented and connected. At the same time, the main beam sections can be increased according to the span of the bridge, and it can adapt to bridges with different spans. By controlling the longitudinal forward and backward movement of the middle support leg 103 and the connection with the mobile tower crane, the overall upper and lower bridge operation and cross-hole operation of the single-girder bridge erection machine can be realized. After the single-girder bridge erection machine is lowered from the bridge, the transport vehicle 17 can be used based on the detachable setting of the main beam 101 of the bridge erection machine to realize the on-site disassembly and rapid transfer transportation of the single-girder bridge erection machine, so as to meet the construction needs of prefabricated bridges in complex urban environments.

[0150] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0151] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0152] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A split multifunctional bridge erecting machine, characterized in that: include: A single-girder bridge erection machine, the single-girder bridge erection machine comprising a bridge erection machine main girder (101), the bridge erection machine main girder (101) being sequentially connected with a front support leg (102), a middle support leg (103) and a rear support leg (104) from front to rear, the middle support leg (103) being movable forward and backward along the bridge erection machine main girder (101), and a front crane (105) and a rear crane (106) being slidably connected to the bridge erection machine main girder (101); A mobile tower crane comprises a tire-type base (201), the top of the tire-type base (201) is vertically connected to a telescopic steel frame (202) composed of a plurality of steel structure segments connected in sequence, the top of the telescopic steel frame (202) is connected to a cantilever hanger (203), and the cantilever hanger (203) is connected to a sling (204).

2. A split multifunctional bridge erecting machine as claimed in claim 1, characterized in that: The front support leg (102) comprises a first support leg cross beam (401) fixed to the front end of the bridge erecting machine main beam (101), the two ends of the first support leg cross beam (401) are connected to first support columns (402), and the bottom of the first support column (402) is connected to a first running wheel (403); The middle support leg (103) comprises a second support leg cross beam (405) slidably connected to the top of the bridge erecting machine main beam (101), the two ends of the second support leg cross beam (405) are connected to second supporting columns (404), and the bottom of the second supporting column (404) is connected to a second running wheel (406); The rear support leg (104) includes a third support leg cross beam (408) fixed to the rear end of the bridge-building machine main beam (101), the two ends of the third support leg cross beam (408) are connected to third supporting columns (407), and the bottom of the third supporting column (407) is connected to a third running wheel (409).

3. A split multifunctional bridge erecting machine as claimed in claim 2, characterized in that: The first supporting column (402) and the second supporting column (404) are composed of multiple lattice-type telescopic columns connected in sequence, and the bottoms of the first supporting column (402) and the second supporting column (404) are both provided with a quick connection device (107) for connecting to a mobile tower crane; The top of the first supporting column (402) is rotatably connected to the first leg beam (401), the top of the second supporting column (404) is rotatably connected to the second leg beam (405), and the top of the third supporting column (407) is rotatably connected to the third leg beam (408).

4. A split multifunctional bridge erecting machine as claimed in claim 2, characterized in that: The main beam (101) of the bridge erecting machine comprises a plurality of detachably connected main beam segments, wherein the plurality of main beam segments are sequentially extended to form the main beam (101) of the bridge erecting machine, the top of the main beam (101) of the bridge erecting machine is provided with an upper slide rail slidably connected to the middle leg (103), and the bottom top of the main beam (101) of the bridge erecting machine is provided with a lower slide rail slidably connected to the front crane trolley (105) and the rear crane trolley (106); A rotating mechanism rotatably connected to the tire-type base (201) is provided at the bottom of the telescopic steel frame (202), and the telescopic steel frame (202) pitches and rotates relative to the tire-type base (201) with the rotating mechanism as a rotation axis.

5. A construction method of a split multifunctional bridge erecting machine, characterized in that: The method uses the split multifunctional bridge erecting machine according to any one of claims 1 to 4, and the method comprises the following steps: Transport the single-girder bridge erecting machine to the construction site and place it along the longitudinal bridge towards the side close to the pier body; The mobile tower crane is transported to the construction site, and the mobile tower crane is lifted from the side of the single-girder bridge erecting machine to lift the single-girder bridge erecting machine; When the single-girder bridge erecting machine is lifted to the designed height, the front legs (102), the middle legs (103) and the rear legs (104) are rotated to a supporting state, and the single-girder bridge erecting machine is lowered to the erection position.

6. The construction method of a split multifunctional bridge erecting machine as claimed in claim 5, characterized in that: The mobile tower crane lifts the single-girder bridge erecting machine from the side of the single-girder bridge erecting machine, which specifically includes the following steps: Two mobile tower cranes are used and moved to the side of the single-girder bridge erecting machine, and the tire-type base (201) is driven to move so that the tire-type base (201) is located below the single-girder bridge erecting machine. The cantilever hanger (203) uses a lifting device (204) to lift the single-girder bridge erecting machine, and the transport vehicle (17) at the bottom of the single-girder bridge erecting machine is removed; The two mobile tower cranes move in coordination to lift the single-girder bridge erecting machine to the top of the erected pier column (12), adjust the front legs (102), middle legs (103) and rear legs (104) of the bridge erecting machine to a supporting state, and lower the single-girder bridge erecting machine with a hoist (204) to support it on the erected cap beam (13).

7. The construction method of a split multifunctional bridge erecting machine as claimed in claim 5, characterized in that: The method further comprises: Using two transport vehicles (17) arranged front and rear on the erected main beam (11) to transport the prefabricated main beam (14) to the lifting position of the front crane (105); The front hoisting crane (105) lifts the front end of the prefabricated main beam (14), so that the front end of the prefabricated main beam (14) is supported on the front hoisting crane (105), and the rear end of the prefabricated main beam (14) is supported on the rear transport vehicle (17); The front transport vehicle (17) is removed, and the front crane (105) and the rear transport vehicle (17) synchronously move the prefabricated main beam (14) longitudinally, so that the prefabricated main beam (14) is longitudinally moved to the lifting position of the rear crane (106); The rear lifting trolley (106) lifts the rear end of the prefabricated main beam (14), so that the prefabricated main beam (14) is completely suspended and supported on the front lifting trolley (105) and the rear lifting trolley (106) of the single-main-beam bridge erecting machine; The front hoisting crane (105) and the rear hoisting crane (106) move longitudinally synchronously to move the prefabricated main beam (14) longitudinally to the designed position to be installed, and the front hoisting crane (105) and the rear hoisting crane (106) lower the prefabricated main beam (14) for installation; After the installation of the prefabricated main beam (14) is completed, the single-main beam bridge erecting machine is moved horizontally as a whole, and the above steps are repeated to install the next prefabricated main beam (14).

8. The construction method of a split multifunctional bridge erecting machine as claimed in claim 7, characterized in that: The method further comprises: After the erection of one prefabricated main beam (14) is completed, the support state of the single-main-beam bridge erecting machine is adjusted so that the single-main-beam bridge erecting machine is supported by the front legs (102) and the rear legs (104), and the middle legs (103) are vacated and longitudinally moved forward along the main beam (101) of the bridge erecting machine to the front end of the erected main beam (11); The supporting state of the single-girder bridge erecting machine is adjusted, wherein the single-girder bridge erecting machine is supported by the middle support leg (103) and the rear support leg (104), and after the front support leg (102) is vacated, the single-girder bridge erecting machine moves longitudinally forward as a whole, and the front support leg (102) is in a suspended state and is located outside the front end of the erected main girder (11); Driving the first mobile tower crane to move to the position of the front legs (102), adjusting the height of the first mobile tower crane to support the front legs (102), so that the front legs (102) are supported and fixed on the telescopic steel frame (202) of the first mobile tower crane; Adjusting the supporting state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the front legs (102) and the middle legs (103), and driving the first mobile tower crane and the single-girder bridge erecting machine to move forward longitudinally together until the first mobile tower crane is moved to the vicinity of the next erected pier (12); The supporting state of the single-main-beam bridge erecting machine is adjusted so that the single-main-beam bridge erecting machine is supported by the front legs (102) and the rear legs (104), and the middle legs (103) are moved forward longitudinally along the main beam (101) of the bridge erecting machine to the front end of the erected main beam (11) after being vacated, and the middle legs (103) are in a suspended state and are located outside the front end of the erected main beam (11); Driving the second mobile tower crane to move to the position of the middle leg (103), adjusting the height of the second mobile tower crane to support the middle leg (103), so that the middle leg (103) supports and is fixed on the telescopic steel frame (202) of the second mobile tower crane; Adjusting the supporting state of the single-girder bridge erecting machine so that the single-girder bridge erecting machine is supported by the middle support leg (103) and the rear support leg (104), disconnecting the front support leg (102) from the first mobile tower crane, and moving the single-girder bridge erecting machine forward longitudinally so that the front support leg (102) is supported above the next erected pier (12); The supporting state of the single-girder bridge erecting machine is adjusted so that the single-girder bridge erecting machine is supported by the front legs (102) and the rear legs (104), the connection between the middle legs (103) and the second mobile tower crane is disconnected, and the middle legs (103) are longitudinally moved backward to the hoisting position of the prefabricated main beam (14) to be erected, and the single-girder bridge erecting machine completes the through-hole operation.

9. A construction method of a split multifunctional bridge erecting machine as claimed in claim 8, characterized in that: The method further comprises: After the single-girder bridge erecting machine has completed the erection of all prefabricated main beams (14), the single-girder bridge erecting machine is moved horizontally to the side beam position; Two mobile tower cranes are used and moved to the side of the single-girder bridge erecting machine, and the cantilever hanger (203) uses the lifting device (204) to lift the single-girder bridge erecting machine, and then the front legs (102), the middle legs (103) and the rear legs (104) are adjusted to a folded state; The two mobile tower cranes move in coordination to lift the single-girder bridge erecting machine from the side beam to a transport vehicle (17), and the transport vehicle (17) drives the single-girder bridge erecting machine away from the construction site.

10. The construction method of a split multifunctional bridge erecting machine as claimed in claim 5, characterized in that: The method further comprises the following steps: Using two transport vehicles (17) arranged in front and behind to transport the prefabricated pier columns (15) to be installed to the pier position on the ground; Coordinately control the transport vehicle (17) and the mobile tower crane so that the front end of the prefabricated pier column (15) is located in the middle of the tire-type base (201) of the mobile tower crane; The mobile tower crane lowers the lifting device (204) to lift the prefabricated pier (15), and removes the transport vehicle (17) near the front of the mobile tower crane; As the lifting device (204) gradually lifts the prefabricated pier column (15), the transport vehicle (17) located at the rear end of the prefabricated pier column (15) synchronously and slowly moves forward to assist the prefabricated pier column (15) in turning over and lifting. After the prefabricated pier column (15) is converted from a horizontal state to a vertical state, the rear transport vehicle (17) is removed after the rear transport vehicle (17) is separated from the prefabricated pier column (15); The mobile tower crane is driven to rotate or move to transport the prefabricated pier column (15) to be installed to the designed pier position and then fall down to install the prefabricated pier column (15).

11. A construction method of a split multifunctional bridge erecting machine as claimed in claim 5 or 10, characterized in that: The method further comprises the following steps: Using two transport vehicles (17) arranged in front and behind to transport the prefabricated cap beam (16) to be installed to the pier position on the ground; Driving two mobile tower cranes to move to the side of the prefabricated cap beam (16) and arrange them at intervals, so that the tire-type base (201) of the mobile tower crane moves to the bottom of the prefabricated cap beam (16); Two mobile tower cranes use the lifting device (204) to simultaneously lift the prefabricated cap beam (16) to a set height, and move away two transport vehicles (17) arranged in front and behind; The two mobile tower cranes are controlled in coordination to transport the prefabricated cap beam (16) to be installed to the designed pier position and lower it by rotating or moving the prefabricated cap beam (16) to install the prefabricated cap beam (16).

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