CN116043715A

CN116043715A - Construction method for construction of prefabricated segmental beams under complex working conditions

Info

Publication number: CN116043715A
Application number: CN202310163671.9A
Authority: CN
Inventors: 张俊艳; 杨志; 代宇; 陈延军; 陈德利; 范先知; 曹长兴; 许文举; 牛青林; 蒋廉斌; 王琪; 王鹏; 高建华; 马俊勇; 付晓帆; 卫森; 祁磊; 程波; 白康; 宋飞
Original assignee: Road Bridge Construction Co Ltd of China Railway 15th Bureau Group Co Ltd; Zhengzhou New Dafang Heavy Industries and Technology Co Ltd
Current assignee: Road Bridge Construction Co Ltd of China Railway 15th Bureau Group Co Ltd; Zhengzhou New Dafang Heavy Industries and Technology Co Ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-05-02

Abstract

The invention discloses a construction method for constructing prefabricated segmental beams under complex working conditions, which is based on a segmental assembling bridge girder erection machine, and comprises a main frame, a front auxiliary supporting leg, a rear auxiliary supporting leg, two middle supporting legs, a first main crown block, a second main crown block and two auxiliary crown blocks, wherein the first main crown block, the second main crown block and the two auxiliary crown blocks can move along the main frame.

Description

Construction method for construction of prefabricated segmental beams under complex working conditions

Technical Field

The invention relates to the technical field of prefabricated segment beam construction, in particular to a construction method for constructing a prefabricated segment beam under a complex working condition.

Background

In recent years, with rapid development of road traffic and rapid construction of cities in large cities in China, the construction environment conditions of viaduct engineering in the cities become more complex: the line plane curve is small, the line longitudinal gradient is large, the bridge distribution is dense and long, the urban environment is originally a small number of people, the traffic is busy, and the bridge construction interference is large, so that more requirements are put forward on the bridge construction, and the prefabricated segment beam assembly technology is also applied.

The construction on a large slope is performed, so that a bridge girder erection machine or a main crown block needs to be prevented from slipping, but the running mechanism of the bridge girder erection machine at present is a wheel-rail system, so that the slipping phenomenon is easily caused by the rolling friction mechanism, and meanwhile, the bridge girder erection machine at present is difficult to meet the erection of a small-radius curve girder.

In summary, in order to meet the rapid development needs of urban rail and highway traffic in the future, it is necessary to develop a novel bridge girder erection machine and complete technology thereof capable of meeting the construction needs of bridge erection of large-span small-curve large-ramp in urban rail traffic engineering to meet the technical needs of emerging girders.

Disclosure of Invention

Aiming at the problems existing in the prior art, the invention provides a construction method for constructing a prefabricated segment beam under a complex working condition.

The technical scheme adopted for achieving the purpose is as follows:

the construction method for the construction of the prefabricated segment beam under the complex working condition is characterized in that the construction method is based on a segment assembly bridge girder erection machine, and the segment assembly bridge girder erection machine comprises a main frame, a front auxiliary supporting leg, a rear auxiliary supporting leg, two middle supporting legs, a first main crown block, a second main crown block and two auxiliary crown blocks, wherein the first main crown block, the second main crown block and the two auxiliary crown blocks are arranged on the main frame and can move along the main frame;

the front auxiliary supporting leg and the rear auxiliary supporting leg are respectively arranged at the front end and the rear end of the main frame;

the two middle supporting legs comprise supporting components and first lifting components, the first lifting components are arranged below the supporting components, the middle supporting legs are arranged below the main frame in a sliding mode through the supporting components, the supporting components mainly comprise two shifting trolleys, a traversing mechanism, a longitudinal shifting mechanism and a supporting leg beam, the shifting trolleys are divided into upper parts and lower parts, the lower parts of the shifting trolleys are arranged on the supporting leg beam, the upper parts of the shifting trolleys are connected with the main frame, the upper parts of the shifting trolleys can rotate along a central shaft of the lower parts of the shifting trolleys, the traversing mechanism drives the shifting trolleys to transversely move on the supporting leg beam, and the longitudinal shifting mechanism pushes the main frame;

The front auxiliary supporting leg comprises a second lifting component, a rotating component and a first fixing component, the second lifting component is arranged at the front end of the main frame, the rotating component and the fixing component are sequentially arranged below the second lifting component, and the first fixing component can rotate on the second lifting component by a certain angle through the rotating component;

the rear auxiliary supporting leg comprises a third lifting assembly and a second fixing assembly, the third lifting assembly is arranged at the rear end of the main frame, and the second fixing assembly is arranged below the third lifting assembly;

the construction method comprises the following steps:

the bridge girder erection machine is in place by one joint, two middle supporting legs are supported on pier top blocks, the front auxiliary supporting legs and the rear auxiliary supporting legs are separated, and the bridge girder erection machine is ready for girder erection;

secondly, sequentially lifting a first segment beam to two sides of a middle supporting leg in front of construction by a first main crown block and a second main crown block, initially aligning, namely adjusting elevation and the aerial posture of a segment block, then adjusting the size of a wet joint, sequentially completing temporary prestress tensioning, mounting a T-structure wet joint template, pouring the wet joint, and tensioning an in-vivo permanent prestress steel beam after the wet joint reaches the design strength;

Repeating the first main crown block and the second main crown block in sequence to symmetrically erect the T structure of the pier where the supporting leg is positioned in the front of construction until the last pair of section beams of the midspan T structure are assembled;

fourthly, after the construction of each first T framework is completed, the first side span section beam hanging construction is carried out;

fifthly, the first main crown block and the second main crown block respectively run to the vicinity of the upper parts of the two middle supporting legs, and the middle supporting leg traversing mechanism is driven to adjust the main frame of the bridge girder erection machine to a proper position in front of the through hole;

a first main crown block, a second main crown block and an auxiliary crown block run to the tail part of the bridge girder erection machine, and the main frame is pushed to move forwards by utilizing the middle supporting leg longitudinal moving mechanism until the front auxiliary supporting leg reaches the upper part of the front pier top block;

(seventh) support the front auxiliary leg and rear auxiliary leg at the same time, take off the middle leg in the rear, the middle leg in the rear of the first main overhead traveling crane hoist to the pier top behind the front auxiliary leg, support the middle leg, and install the pier top anchoring device of the middle leg;

(eight) disengaging the front auxiliary supporting leg and the rear auxiliary supporting leg, running the first main crown block, the second main crown block and the auxiliary crown block to the front end of the bridge girder erection machine, and pushing the main frame to move forward by utilizing the middle supporting leg longitudinal moving mechanism until the main frame moves forward to reach the girder erection position, so that the bridge girder erection machine is ready to pass holes again;

And (ninth) repeating the steps (II) to (III) to finish the construction of the T-shaped structure of the bridge middle pier;

a first main crown block and a second main crown block are respectively opened to the vicinity of the upper parts of the front middle supporting leg and the rear middle supporting leg, and a middle supporting leg transverse moving mechanism is driven to adjust the main frame of the bridge girder erection machine to a proper position in front of the through hole so as to prepare for one-linkage-end crossing;

eleven, the first main crown block, the second main crown block and the auxiliary crown block run to the tail part of the bridge girder erection machine, the middle supporting leg longitudinal moving mechanism pushes the main frame to move forward until the front auxiliary supporting leg reaches the upper part of the front pier side supporting frame, and the front auxiliary supporting leg is supported on the pier side supporting frame;

(twelve) placing a segment beam at the top of the side span pier in place by using a first main crown block;

thirteenth, repeating the step (twelve) to mount the other section beam on the pier top in place, and temporarily anchoring the two pier top blocks, so that the pier top blocks can meet the supporting requirement of the middle supporting leg;

fourteen supporting the rear auxiliary leg, disengaging the rear middle leg;

fifteen, the middle supporting leg behind the first main crown block crane is connected to the pier top behind the front auxiliary supporting leg, the first main crown block, the second main crown block and the auxiliary crown block are operated to the front end of the bridge girder erection machine, the front auxiliary supporting leg and the rear auxiliary supporting leg are separated, and the bridge girder erection machine is ready for passing holes again;

Sixthly, pushing the main frame by using the middle supporting leg longitudinal moving mechanism, moving forward to reach the girder erecting position, constructing a joint end span, pouring a middle wet joint, and tensioning a whole span permanent stress steel beam, so that the joint construction is completed.

In the step (a), the step (b) and the step (c), when the bridge girder erection machine is subjected to the T-shaped suspension assembly, the front auxiliary crown block and the rear auxiliary crown block respectively hang the tensioning platform on two sides of the section girder to be installed, and serve as operation platforms of personnel, when the line is a curve, the whole machine is transversely moved to a proper position in advance before the first main crown block and the second main crown block lift the section girder, so that the whole machine transversely moved under the condition that the first main crown block and the second main crown block lift the section girder is avoided;

when the whole machine is required to transversely move, the first main crown block and the second main crown block are respectively arranged above the front middle supporting leg and the rear middle supporting leg.

Further, in the step (four), the suspension construction of the first span section beam is carried out according to the following steps:

(1) The section beam suspension sequence is that the section beams are suspended section by section from side to midspan direction;

(2) The beam is transported in place, a suspender is arranged, the first main crown block lifting beam is controlled, meanwhile, a section beam block is suspended on a main frame by the suspender and the hanger, and the steps are repeated until the first span section beam is completely suspended and assembled;

(3) Sequentially carrying out three-dimensional space adjustment and initial alignment on the segmental beams by using a first main crown block, coating epoxy resin, then carrying out accurate alignment and temporary prestress tensioning, then installing a wet joint template and pouring a wet joint, and further carrying out whole span permanent stress steel beam tensioning;

(4) And after the whole span is stretched, the hanging is unloaded, and the hanging is dismantled.

Further, in the step (fifth) and the step (tenth), when the bridge girder erection machine performs the curve via hole, the middle leg internal traversing mechanism needs to drive the shifting trolley to carry the main frame to transversely amplitude a certain distance and control the shifting trolley to rotate a certain angle, and the specific steps include:

(1) The middle supporting leg traversing mechanism drives the whole machine to traverse and change an amplitude by a certain distance so that the main frame at one middle supporting leg is traversed to a target position;

(2) Taking the central line of a shifting trolley of one middle supporting leg of the main frame reaching the target position as a rotating shaft, and driving a traversing mechanism of the other middle supporting leg to continue to carry the main frame to traverse to the target position;

(3) In the process of driving the whole machine to move transversely by the transverse moving mechanism, the angle between the supporting leg cross beam and the main frame can be changed, and the distance between the two shifting trolleys of a single middle supporting leg on the supporting leg cross beam can be changed, so that after the transverse moving mechanism of the middle supporting leg drives the whole machine to move transversely for a certain distance, the connecting rod between the two shifting trolleys is required to be loosened, after the length of the connecting rod is adjusted, the shifting trolleys are connected, the transverse movement is continued after the connecting rod is connected, and the process is repeated for several times until the target transverse moving amount is reached.

Further, in the step (six) and the step (eleven), when the bridge girder erection machine is in place on the front pier top or the pier side bracket at the through hole of the curve section, the following steps are required:

(1) When the front auxiliary supporting leg reaches the center of the pier top, the bolt connection between the upper beam and the lower beam at the lower end of the front auxiliary supporting leg is released;

(2) The lower layer cross beam is driven to rotate, and finally the lower layer cross beam of the front auxiliary supporting leg 2 is basically parallel to the bridge pier or the pier side bracket, and the bolts between the two layers of cross beams are reconnected;

(3) Continuing to advance to the proper position and supporting on the anchoring longitudinal beam or the pier-side bracket;

(4) The lower cross beam of the front auxiliary supporting leg is effectively anchored with the anchoring longitudinal beam or the pier side, so that the sliding of the lower cross beam of the front auxiliary supporting leg is prevented.

Further, in the step (seventh) and the step (fifteen), the supporting leg via hole in the rear of the first main crown block hoisting needs to be according to the following steps:

(1) The front auxiliary crown block moves to the front end of the main frame 1;

(2) Connecting a lifting appliance of the first main crown block with a rear middle supporting leg, and taking off the rear middle supporting leg of the first main crown block;

(3) The first main crown block lifts the middle supporting leg at the rear to the rear span midspan position, and the first main crown block drives the middle supporting leg to rotate 90 degrees clockwise and then continues to move forward;

(4) The first main crown block lifts the rear middle supporting leg to the front span midspan position to drop and rotates anticlockwise by 90 degrees;

(5) The middle supporting leg at the rear of the first main crown block continuously moves to the pier top position behind the front auxiliary supporting leg.

Further, in the step of lifting the support leg through holes in the rear of the first main crown block, the method comprises the following steps:

(1) In the process of supporting legs in the process of transporting the first main crown block, a lifting appliance rotating mechanism of the main crown block has two rotating actions of 90 degrees, and the directions of the two rotating actions are opposite;

(2) When the middle supporting leg of the first main crane is in a hollow state and the balance of the middle supporting leg cannot be ensured, the two shifting trolleys of the middle supporting leg are respectively adjusted in position to serve as weights, so that the positions of the shifting trolleys are fixed after the two shifting trolleys are balanced, and then the middle supporting leg is continuously lifted and lifted to move forwards.

Further, in the step (twelve), the first main crown block is required to place a segment beam at the top of the side span pier according to the following steps:

(1) The front auxiliary crown block is driven to the front end of the main frame, and the first main crown block moves forward for about 20m;

(2) Simultaneously, the rear auxiliary supporting leg is conveyed forwards to the rear of the middle supporting leg by utilizing a second main crown block, and is temporarily hung on the lower chord of the main frame by using a screw reinforcing steel bar;

(3) The segmental beams are dumped into the spans of the two middle supporting legs by using a second main crown block and are placed on the bridge deck;

(4) The second main crown block returns to the tail part of the main frame to continue taking the beam, and the lifting appliance of the first main crown block is reconnected with the inner-span section beam;

(5) The first main crown block is utilized to transport the segment beam to the vicinity of the front bridge pier;

(6) The first main crown block rotates the segmental beams by 90 degrees;

(7) The first main crown block places the front half section beam of the pier top in place;

(8) And temporarily supporting and fixing the segment beam and the bridge pier.

Further, in the step (fourteen), the supporting of the rear auxiliary leg and the removal of the leg in the rear are performed according to the following steps:

(1) The second main crown block runs to the tail part of the main frame, and the rear auxiliary supporting leg is backward and reversely transported to a proper position by using the second main crown block and is bolted to the lower chord of the main frame by using bolts so as to support the rear auxiliary supporting leg;

(2) And the lifting device is connected with the lifting appliance of the first main crown block and the rear middle supporting leg, and the rear middle supporting leg of the first main crown block is hollow.

Further, the first main crown block and the second main crown block comprise two first running mechanisms, a lifting hoisting mechanism and a hanging beam assembly, the two first running mechanisms adopt a tooth pin transmission mode, and the first main crown block and the second main crown block move along the upper part of the main frame through the first running mechanisms;

The lifting hoisting mechanism is connected with the hanging beam assembly through a steel wire rope, a three-dimensional adjusting device is arranged on the hanging beam assembly and used for adjusting the angle of the hanging beam assembly, and a member used for hoisting the front auxiliary supporting leg, the rear auxiliary supporting leg and the middle supporting leg is further arranged on the hanging beam assembly.

The invention has the beneficial effects that:

1. the invention adopts a construction method that the prestressed concrete box girder to be erected is concentrated on a special girder manufacturing field for subsection prefabrication, then transported to a bridge construction site and fed into a bridge girder erection machine from a rear span to carry out T-shaped cantilever splicing operation, then first-span and half-span cantilever splicing operation is carried out, and after the last-span and half-span cantilever splicing operation is completed, the construction method of integral prestress tensioning is carried out, and simultaneously, the transverse movement and the hanging transverse movement of a crown block are matched to adapt to the erection of a curve girder with smaller radius, and the transverse movement and the rotating mode of supporting legs are adopted to adapt to the bridge erection construction of a small curve segment, so that the construction of a via hole in the small curve segment is realized, the safety of the via hole is increased, the construction safety under various complex working conditions is ensured, the construction efficiency is improved, the traffic interference is avoided, and the environment is prevented.

2. The construction method can simultaneously construct the double-width bridge, gives up the pushing mode of the oil cylinder adopted by the original transverse movement, adopts the sprocket driving mode, ensures that the whole construction process is fast and has good safety, meets the requirement of the double-width transverse alternate erection, and completes the transverse movement of the equipment.

3. According to the invention, when the middle supporting leg is lifted by the main crown block, the lifting appliance on the main crown block drives the middle supporting leg to rotate for ninety degrees in two opposite directions, so that the normal power supply of the middle supporting leg in subsequent construction is ensured.

Drawings

FIG. 1 is a schematic diagram of an overall T-frame of the present invention;

FIG. 2 is a schematic diagram of an overall semi-full carrier of the present invention;

FIG. 3 is a top view of the main frame of the present invention;

FIG. 4 is a front view of the main frame of the present invention;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4 in accordance with the present invention;

FIG. 6 is a cross-sectional view taken at B-B of FIG. 4 in accordance with the present invention;

FIG. 7 is a front view of a front auxiliary leg structure of the present invention;

FIG. 8 is a side view of a front auxiliary leg structure of the present invention;

FIG. 9 is a schematic view of a leg structure according to the present invention;

FIG. 10 is a schematic view of a lifting assembly of the leg structure of the present invention;

FIG. 11 is a front view of a rear auxiliary leg structure of the present invention;

FIG. 12 is a side view of a rear auxiliary leg structure of the present invention;

FIG. 13 is a front view of a first primary crown block structure of the present invention;

FIG. 14 is a side view of a first primary crown block structure of the present invention;

FIG. 15 is a front view of a second primary crown block structure of the present invention;

FIG. 16 is a side view of a second primary crown block structure of the present invention;

FIG. 17 is a front view of an auxiliary crown block structure of the present invention;

FIG. 18 is a side view of an auxiliary crown block structure of the present invention;

FIG. 19 is a schematic view of a single hanger unit in the hanger assembly of the present invention;

FIG. 20 is a schematic view of the view from direction A of FIG. 19 in accordance with the present invention;

FIG. 21 is a schematic view in the direction B of FIG. 19 in accordance with the present invention;

FIG. 22 is a cross-sectional view taken at C-C of FIG. 19 in accordance with the present invention;

FIG. 23 is a schematic view of a wet joint construction platform according to the present invention; the method comprises the steps of carrying out a first treatment on the surface of the

FIG. 24 is a schematic view of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 25 is a second schematic view of a construction flow of the construction method of the bridge girder erection machine of the present invention;

FIG. 26 is a third schematic illustration of a construction flow of the bridge girder erection machine construction method of the present invention;

FIG. 27 is a schematic diagram of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 28 is a schematic diagram of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 29 is a schematic view of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 30 is a schematic diagram of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 31 is a schematic view of a construction flow eighth of the construction method of the bridge girder erection machine according to the present invention;

FIG. 32 is a construction flow diagram nine of a construction method of a bridge girder erection machine according to the present invention;

FIG. 33 is a schematic view of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 34 is a schematic diagram of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 35 is a schematic view showing twelve construction flow steps of a construction method of a bridge girder erection machine according to the present invention;

FIG. 36 is a schematic view of thirteen construction flows of the construction method of the bridge girder erection machine in the invention;

FIG. 37 is a schematic view of fourteen construction flows of the construction method of the bridge girder erection machine in the invention;

FIG. 38 is a schematic view fifteen of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 39 is a sixteen schematic views of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 40 is a seventeen schematic views of a construction flow of a construction method of a bridge girder erection machine according to the present invention;

FIG. 41 is a schematic view of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 42 is a schematic illustration of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 43 is a schematic diagram of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 44 is a schematic diagram of a construction flow of a bridge girder erection machine construction method according to the present invention twenty-one;

FIG. 45 is a schematic diagram of a construction flow of a bridge girder erection machine construction method according to the present invention;

FIG. 46 is a twenty-third schematic construction flow chart of a bridge girder erection machine construction method according to the present invention;

FIG. 47 is a twenty-four schematic construction flow chart of a bridge girder erection machine construction method according to the present invention;

FIG. 48 is a schematic diagram of twenty-five construction flows of a construction method of a bridge girder erection machine in the invention.

Wherein 1-main frame, 1 a-main beam, 1 b-connecting beam, 1 c-rail square steel, 1 d-driving rail, 1 e-hanging rail, 1 f-vehicle gear, 2-front auxiliary leg, 2 a-hinged-support assembly, 2 b-first upper beam, 2 c-column jacket, 2 d-first middle beam, 2 e-first inner sleeve column, 2 f-first jacking cylinder, 2 g-first lower beam, 2 h-shoulder pole beam, 2 i-electric rotating shaft, 2 j-anchoring longitudinal beam, 2 k-screw reinforcement, 3-middle leg, 3 a-shifting trolley, 3 b-longitudinal shifting mechanism, 3 c-traversing mechanism, 3 d-connecting rod, 3 e-leg beam, 3 f-supporting beam, 3 g-third inner sleeve column, 3 h-jacket heightening section, 3 i-third jacking cylinder, 3 j-cylinder lifting joint, 3 k-cylinder cross beam, 3 l-adjustable support, 3 m-bottom cross beam, 3 n-scissor support, 3 o-anchoring device, 4-rear auxiliary leg, 4 a-second inner sleeve column, 4 b-second upper cross beam, 4 c-second middle cross beam, 4 d-second lower cross beam, 4 e-cushion block, 4 f-connecting cross beam, 4 g-diagonal brace, 4 h-second lifting cylinder, 5-first main crown block, 5 a-crown block, 5 b-cross beam assembly, 5 c-first traveling mechanism, 5d is lifting hoist mechanism, 5e is lifting beam assembly, 6-second main crown block, 6 a-crown block, 6 b-cross beam assembly, 6 c-first traveling mechanism, 6 d-lifting hoist mechanism, 6 e-lifting beam assembly, the device comprises a 6 f-first electric hoist, a 7-auxiliary crown block, a 7 a-second running mechanism, a 7 b-auxiliary crown block portal frame, a 7c-5t electric hoist, a 7d-10t electric hoist, a 7 e-balancing weight, an 8-tensioning platform, a 9-hanging component, a 9 a-long suspender, a 9 b-traversing beam, a 9 c-balancing beam, a 9 d-hook, a 9 e-long crossbeam, a 9 f-short suspender, a 10-wet seam construction platform, a 10 a-lower frame, a 10 b-upper frame, a 10 c-stay bar, a 10 d-stay bar, a 10 e-adjustable stay bar, a 10 f-beam surface horizontal stay bar, a 10 g-twisted steel bar and a 10 h-movable crawling ladder.

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1-23, the present embodiment discloses a construction method for constructing a prefabricated segment beam under a complex working condition, which is based on a novel segment assembly bridge girder erection machine, wherein the bridge girder erection machine comprises a main frame 1, a front auxiliary supporting leg 2, two groups of middle supporting legs 3, a rear auxiliary supporting leg 4, a first main crown block 5, a second main crown block 6, an auxiliary crown block 7, a tensioning platform 8, a hanging component 9 and a wet joint construction platform 10.

As shown in fig. 1-6, the main frame 1 is composed of two truss type main beams 1a and a connecting beam 1b, the main beams 1a are in a regular triangle double-layer truss structure, the connecting beam 1b is in an inverted triangle truss structure, the main frame 1 is in a symmetrical structure in the transverse and longitudinal directions, rail square steel 1c is arranged at the middle position of the upper chord top of the two main beams 1a in a through manner, a driving rail 1d for driving a speed reducer gear is arranged at the upper chord top of the two main beams in a through manner, a hanging rail 1e is arranged in the middle of the lower chord of the two main beams, a vehicle rail 1f is arranged at the upper chord end position of the two main beams, and the main frame is in a double-layer triangle truss structure and is in a full symmetrical structure, so that the bridge girder erection machine is convenient to realize reverse construction.

As shown in fig. 1 to 8, the front auxiliary supporting leg 2 is a fixed supporting leg, the upper end is hinged at the front end of the main beam 1a, the lower end is supported on a bridge pier or a temporary support beside the bridge girder, the temporary support is used for completing the switching and the installation of the two groups of middle supporting legs 3, and meanwhile, the bridge girder is also used for carrying out heavy load support when the bridge girder is erected by a pier top block and a 0# block, the front auxiliary supporting leg 2 comprises a hinged support assembly 2a, a first upper cross beam 2b, a column jacket 2c, a first middle cross beam 2d, a first inner sleeve column 2e, a first jacking cylinder 2f, a first lower cross beam 2g, a shoulder pole beam 2h, an electric rotating shaft 2i and an anchoring longitudinal beam 2j, wherein the hinged support assembly 2a, the first upper cross beam 2b, the first middle cross beam 2d, the first inner sleeve column 2e, the first jacking cylinder 2f and the first lower cross beam 2g form a second lifting assembly, the electric rotating shaft 2d, the shoulder pole beam 2h and the anchoring longitudinal beam 2j form a first fixed assembly.

As shown in fig. 1 to 8, the upper part of the hinged support assembly 2a is connected to the bottom of the lower chord of the main beam 1a through bolts, the lower part of the hinged support assembly 2a is directly welded on the first upper beam 2b, the lower part of the first upper beam 2b and the column jacket 2c are welded into a whole frame, the first upper beam 2b in the welding area of the column jacket 2c is provided with square holes, the first middle beam 2d is connected on the first inner sleeve column 2e through a pin shaft, the first jacking cylinder 2f is connected between the first upper beam 2b and the first middle beam 2d, the lower part of the first inner sleeve column 2e is bolted on the first lower beam 2g, an electric rotating shaft 2i is arranged between the first lower beam 2g and the shoulder beam 2h, the shoulder beam 2h can rotate along the electric rotating shaft 2g, the shoulder beam 2h is supported on the anchoring longitudinal beam 2j, and the anchoring longitudinal beam 2j is connected with the embedded threads 2k on the pier top.

As shown in fig. 1 to 10, the middle supporting leg 3 is provided with two sets of completely same structure, and is a movable supporting leg, the upper end of the middle supporting leg 3 is slidably supported on the lower chord of the main beam 1a, the lower end of the middle supporting leg is supported on the pier top block and the 0# block through an adjustable support 3l, the middle supporting leg 3 is a heavy-load support when the bridge girder erection machine is erected, meanwhile, the middle supporting leg 3 is matched with the front auxiliary supporting leg 2 and the rear auxiliary supporting leg 4 to jointly complete equipment through holes, each set of middle supporting leg 3 comprises two shifting trolleys 3a, a longitudinal shifting mechanism 3b, a traversing mechanism 3c, a connecting rod 3d, a supporting leg crossbeam 3e, a supporting crossbeam 3f, two third inner sleeve columns 3g, an outer sleeve heightening joint 3h, a third jacking cylinder 3i, an oil cylinder heightening joint 3j, an oil cylinder crossbeam 3k, an adjustable support 3l, a bottom crossbeam 3m, a scissor support 3n and an anchoring device 3o, wherein the two shifting trolleys 3a and the supporting leg crossbeam 3e form a supporting assembly, the two third inner sleeve columns 3g, the third jacking cylinder 3k and the oil cylinder 3l form a single lifting unit.

As shown in fig. 1-10, the two shifting trolleys 3a are provided, the longitudinal shifting mechanisms 3b are arranged on the shifting trolleys 3a, the shifting trolleys 3a are respectively supported at the bottom of the lower chord of the single girder 1a through the longitudinal shifting mechanisms 3b, in the embodiment, the longitudinal shifting mechanisms are in the prior art, the girder 1a on the main frame 1 can be pushed to move forwards, the single shifting trolleys 3a are divided into upper parts and lower parts, the lower parts of the shifting trolleys 3a are arranged on the supporting leg cross beams 3e, the upper parts of the shifting trolleys 3a are supported at the bottom of the lower chord of the single girder 1a through the longitudinal shifting mechanisms 3b, the upper parts of the shifting trolleys can rotate along the central shaft of the lower parts of the shifting trolleys, anchors are arranged between the shifting trolleys 3a and the lower chord of the girder 1a, the bridge girder Liang Gongkuang is required to be installed in place, and a connecting rod 3d is arranged between the two shifting trolleys 3 a;

The transverse moving mechanism 3c is arranged at one end of the supporting leg beam 3e, the transverse moving mechanism 3c adopts a chain wheel driving mode, the mode that the whole transverse moving of the conventional bridge girder erection machine adopts an oil cylinder pushing mode is broken, double transverse alternate erection can be met, and the transverse moving of the equipment is completed, so that the whole construction speed of the equipment is high, the safety of the whole construction process is good, a chain is arranged on the transverse moving mechanism 3c, a driving wheel meshed with the chain is arranged on the transverse moving mechanism 3c, a driven wheel meshed with the chain is matched with the other end of the supporting leg beam 3e, the transverse moving mechanism 3c drives the driving wheel to rotate so as to drive the chain to move, and meanwhile, the shifting trolley 3a is arranged on the chain, namely, when the transverse moving mechanism 3c drives the chain to move, the shifting trolley 3a is driven to transversely move left and right on the supporting leg beam 3 e;

the support beam 3f is bolted to the lower part of the support beam 3e, four support beams 3f are arranged on a single middle support leg 3 in total, the single support beam 3f is connected with two third inner sleeve columns 3g through pin shafts, an outer sleeve heightening joint 3h is arranged between the support beam 3f and the third inner sleeve columns 3g, the outer sleeve heightening joint 3h is connected with the support beam 3e through flange bolts, the outer sleeve heightening joint 3h is connected with the inner sleeve columns 3g through pin shafts, the top of the third jacking cylinder 3i is bolted to the bottom of the support beam 3e, the bottom is bolted to the top of the cylinder beam 3k, cylinder heightening joints 3j are arranged between the third jacking cylinder 3i and the cylinder beam 3k, the cylinder beam 3k is connected with the two third inner sleeve columns 3g through pin shafts, the bottom beam 3m is four pieces in total, the bottom of the single bottom beam 3m is connected with the two third inner sleeve columns 3g through flange bolts, an adjustable support 3l is bolted to the bottom of the single bottom beam 3m, the scissor support 3n is connected with the outer sleeve 3h through flange bolts, and the top of the support leg 3i is in a state of being in a vertical position on the support leg 3e, and the support leg 3o is not connected with the top of the support beam 3o in a fixed position, and can be fixed to the top of the support beam 3e is fixed at the top of the support beam 3 e;

In the invention, the supporting leg 3 adapts to the erection construction of the bridge with the small curve section in a manner of transversely moving and rotating the supporting leg, so that the via hole of the equipment in the small curve section is realized, and the safety of the via hole of the equipment is improved.

As shown in fig. 11-12, the rear auxiliary leg mainly comprises a second inner sleeve column 4a, a second upper beam 4b, a second middle beam 4c, a second lower beam 4d, a cushion block 4e, a connecting beam 4f, an inclined strut 4g and a second lifting cylinder 4h, wherein the second inner sleeve column 4a, the second upper beam 4b, the second middle beam 4c, the connecting beam 4f and the second lifting cylinder 4h form a third lifting assembly, and the second lower beam 4d and the cushion block 4e form a second fixing assembly.

As shown in fig. 1-12, the connecting beam 4f is welded into an integral frame by four beams with an i-shaped cross section, the integral frame is connected with the lower chord of the main beam 1a through bolts, the upper part of the second upper beam 4b is hinged with the connecting beam 4f, two sides of the second upper beam are connected with the second inner sleeve 4a through pins, the middle of the second upper beam is bolted with the second jacking cylinder 4h, two sides of the second middle beam 4b are connected with the second inner sleeve 4a through pins, the middle of the second middle beam is pinned with the second jacking cylinder 4h, the upper part of the second lower beam 4d is connected with the second inner sleeve 4a through flange bolts, the lower part of the second lower beam is connected with the cushion block 4e through bolts, and the cushion block 4e is directly supported on the concrete beam surface.

As shown in fig. 1-14, the first main overhead travelling crane 5 in the invention comprises an overhead travelling crane portal 5a, a beam assembly 5b, a first travelling mechanism 5c, a lifting hoisting mechanism 5d and a lifting beam assembly 5e, wherein the lifting hoisting mechanism 5d is fixed on the beam assembly 5b, the beam assembly 5b is slidably arranged on the beam of the overhead travelling crane portal 5a, the beam assembly 5b and the overhead travelling crane portal 5a can slide relatively, the lifting hoisting mechanism 5d is connected with the lifting beam assembly 5e through a steel wire rope, the lifting beam assembly 5e is provided with a three-dimensional adjusting device, in the embodiment, the three-dimensional adjusting device is in the prior art, the lifting beam assembly 5e can be adjusted at multiple angles, so that the lifting appliance flatness adjusting angle is large, the lifting hoisting mechanism is more beneficial to adapting to a larger longitudinal and transverse slope frame beam, the overhead travelling crane lifting beam assembly 5e is simultaneously provided with components for hoisting the front auxiliary supporting leg 2, the middle supporting leg 3 and the rear auxiliary supporting leg 4, the first travelling mechanism 5c is composed of four wheel boxes which are hinged with the overhead travelling crane portal 5a through pin shafts, the first travelling mechanism 5c is connected with the overhead travelling crane portal 5a through four wheel boxes by adopting a steel wire rope, the four-wheel boxes are more difficult to drive the main travelling crane in the frame 1, and the main travelling crane is more difficult to be driven by a complex in the working condition, and the main crane is more difficult to be driven by a high-speed, and has a high-speed and a requirement that the main crane is difficult to be driven by a high-speed and a working condition.

As shown in fig. 15-16, the second main crown block 6 has substantially the same structure as the first main crown block 5, except that the crown block door frame 6a of the second main crown block 6 is provided with a cantilever beam, and two ends of the cantilever beam are provided with two first electric hoists 6f of 5t for hoisting the wet joint construction platform.

As shown in fig. 1-18, two sets of auxiliary crown blocks 7 are provided in the present invention, the two sets of auxiliary crown blocks 7 are respectively disposed at the front and rear ends of the first main crown block 5 and the second main crown block 6, the auxiliary crown block 7 includes a second running mechanism 7a, an auxiliary crown block gantry 7b, 5t electric hoists 7c, 10t electric hoists 7d and balancing weights 7e, the running mechanism 7a is composed of two sets of running wheel boxes, the driving of the running mechanism 7a is driven by pin teeth and is braked by a motor, the auxiliary crown block gantry 7b is composed of a box-type main beam and four leg upright posts, the upper and lower ends of the leg upright posts are respectively connected with the gantry main beam and the running wheel boxes, a triangle-shaped stable structure is formed upward on the forward bridge gantry 7b, the balancing weights 7e are provided on the crown block gantry 7b for running 10t electric hoists 7d and two 5t electric hoists 7c, and the balancing weights 7e are provided on the crown block gantry 7b for ensuring the stability of the auxiliary crown block 7 when hoisting 10t electric hoists 7 d.

As shown in fig. 1-22, the hanging mechanism 9 in the invention is composed of a plurality of hanging units, each hanging unit comprises a long hanging rod 9a, a transverse beam 9b, an equalizing beam 9c, a hooking 9d, a long cross beam 9e and a short hanging rod 9f, the number of the long hanging rods 9a is four, the upper parts of the long hanging rods are connected with a hanging rail 1e of the lower chord of the main beam 1a, the hanging mechanisms can longitudinally move along a hanging rail 1e groove, the lower parts of every two long hanging rods 9a are respectively connected with the transverse beam 9b and the equalizing beam 9c, two sides of the transverse beam 9b are directly hooked on the lug beams at two sides of the lower cross beam 9e, the equalizing beam 9c is hinged with the hooking 9d through a pin shaft, and the hooking 9d mechanism is directly hooked on the lug beams of the lower cross beam 9e, so that a stable form of four-point lifting three-point balance.

As shown in fig. 23, the wet joint construction platform 10 of the present invention includes a lower frame 10a, an upper frame 10b, a brace 10c, a tie rod 10d, an adjustable brace 10e, a horizontal brace 10f for a girder surface, a threaded steel bar 10g and a movable ladder 10h, wherein the lower frame 10a is welded into a rectangular truss structure by section steel and plates, two pieces are provided, the middle is connected by flange bolts, a single lower frame 10a and a single upper frame 10b are hinged by pin shafts, a plurality of braces 10c are provided between the upper frame 10b and the lower frame 10a, so that the upper frame and the lower frame form a stable structure, the upper end of the upper frame 10b is connected with the tie rod 10d by pin shafts, the tie rod 10d, the horizontal brace and the adjustable brace 10e are connected into a stable P-shaped structure by pin shafts, the two P-shaped structures are directly hung on the girder surface, the upper portions and the bottoms of the two P-shaped structures are connected by the bolts 10f, and the movable ladder is directly hung on the lower frame 10a and the upper frame 10b for the convenience of the upper and lower persons.

When the middle bridge girder erection machine is used, the first jacking oil cylinder 2f is regulated in the front auxiliary supporting leg 2, the first inner sleeve column 2e is driven to move through the first middle cross beam 2d, so that the front auxiliary supporting leg 2 has a large amount of vertical regulation, the middle supporting leg 3 is mutually matched with the third jacking oil cylinder 3i, the oil cylinder heightening joint 3j and the outer sleeve heightening joint 3h, the oil cylinder cross beam 3k is driven by the third jacking oil cylinder 3i so as to drive the third inner sleeve column 3g to move, the number of the oil cylinder heightening joint 3j and the outer sleeve heightening joint 3h can be regulated in a targeted manner according to specific construction conditions, the vertical regulation of the middle supporting leg is further increased, the second jacking oil cylinder 4h is regulated in the rear auxiliary supporting leg 4 so as to drive the second lower cross beam 4c to drive the second inner sleeve column 4a to move, so that the rear auxiliary supporting leg 4 has a large amount of vertical regulation, and the middle bridge girder erection machine can adapt to the use of a large longitudinal slope line;

the middle supporting leg 3 controls the chain on the transverse moving mechanism 3c to move, so that the shifting trolley 3a is driven to move on the supporting leg cross beam 3e along the chain, and the transverse movement of the middle supporting leg is realized, so that the equipment can be suitable for the use of a larger transverse slope line;

Through control first underbeam 2g along electric rotating shaft 2i at shoulder pole roof beam 2h rotation, realize the low-angle rotation of preceding auxiliary leg, rotate through control shift trolley 3a carries out certain angle, and then realize the low-angle rotation of well landing leg to more be favorable to equipment adaptation little curve construction.

As shown in fig. 24-48, in this embodiment, a construction method for constructing a prefabricated section beam under a complex working condition, taking a bridge with three spans as a link for construction by a bridge girder erection machine as an example, specifically includes the following steps;

the bridge girder erection machine is in place by one joint, two middle supporting legs 3 are supported on pier top blocks, a front auxiliary supporting leg 2 and a rear auxiliary supporting leg 4 are separated, and the bridge girder erection machine is ready for girder erection;

secondly, sequentially lifting a first segment beam to two sides of a middle supporting leg 3 in front of construction by a first main crown block 5 and a second main crown block 6, initially aligning, namely adjusting elevation and segment block aerial posture, then adjusting wet joint size, sequentially performing fine alignment, and performing temporary prestress tensioning, mounting a wet joint template between a T structure and pouring the wet joint, and performing in-vivo permanent prestress steel beam tensioning after the wet joint reaches design strength;

repeating the step (II) to sequentially and symmetrically erect the T structure of the pier where the supporting leg 3 is positioned in front of the construction by the first main crown block 5 and the second main crown block 6 until the final pair of section beams of the midspan T structure are assembled;

And (IV) after each T-shaped framework is established, carrying out the hanging construction of the first side span section beam, wherein the specific construction steps are as follows: the method comprises the steps of (1) hanging a segmental beam section by section from side to midspan, (2) transporting the beam in place and installing a hanging rod, controlling a first main crown block 5 to carry the beam, hanging a segmental beam block on a main frame 1 by using the hanging rod and hanging, repeating the steps until the whole hanging and assembling of the segmental beam of the first span are completed, (3) sequentially carrying out three-dimensional space adjustment on the segmental beam by using the first main crown block 5, carrying out initial alignment, further coating epoxy resin, then carrying out accurate alignment and carrying out temporary prestress tensioning, then installing a wet joint template and casting a wet joint, further carrying out whole span permanent stress steel beam tensioning, (4) hanging and unloading after the whole span tensioning is completed, and removing the hanging;

and (V) the first main crown block 5 and the second main crown block 6 respectively run to the vicinity above the two middle supporting legs 3, and the middle supporting leg 3 traversing mechanism 3c is driven to adjust the main frame of the bridge girder erection machine to a proper position in front of the through hole, which comprises the following specific steps: the method comprises the steps that (1) a middle supporting leg traversing mechanism 3a drives a whole machine to transversely move to a certain distance in a traversing manner to enable a main frame 1 at one middle supporting leg to transversely move to a target position, (2) a center line of a shifting trolley 3f of the middle supporting leg at one position, which is obtained by enabling the main frame 1 to reach the target position, is taken as a rotating shaft, the traversing mechanism 3a of the other middle supporting leg is driven to continuously carry the main frame 1 to transversely move to the target position, (3) in the traversing process of the traversing mechanism 3a, an angle between a supporting leg cross beam 3e and the main frame 1 is changed, and the distance between two shifting trolleys 3f of a single middle supporting leg 3 is changed on the supporting leg cross beam 3e, so that a connecting rod 3d between the two shifting trolleys 3a is required to be loosened after the traversing mechanism 3a of the middle supporting leg 3a drives the whole machine to transversely move for a certain distance, after the length of the connecting rod 3g is adjusted, the connecting rod 3a is connected, and then transversely moves continuously for several times until the target traversing amount is reached;

And (six) the first main crown block 5, the second main crown block 6 and the auxiliary crown block 7 are operated to the tail part of the bridge girder erection machine, the middle supporting leg 3 is utilized to longitudinally move the mechanism 3b to push the main frame to move forwards until the front auxiliary supporting leg 2 reaches the upper part of the front pier top block, and when the bridge girder erection machine passes through a hole at a curve section and the front auxiliary supporting leg 2 is positioned on the front pier top or a pier side bracket, the following steps are needed: when the front auxiliary supporting leg 2 reaches the center of the pier top, the bolt connection between the upper and lower cross beams at the lower end of the front auxiliary supporting leg 2 is released, (2) the lower cross beam is driven to rotate, and finally the lower cross beam of the front auxiliary supporting leg 2 is basically parallel to a pier or a pier side bracket, the bolts between the two cross beams are reconnected, (3) the front auxiliary supporting leg 2 continues to move forward and is supported on an anchoring longitudinal beam 2j or the pier side bracket, (4) the lower cross beam of the front auxiliary supporting leg 2 is effectively anchored with the anchoring longitudinal beam 2j or the pier side bracket, so that the front auxiliary supporting leg 2 is prevented from sliding;

(seventh) simultaneously supporting the front auxiliary supporting leg 2 and the rear auxiliary supporting leg 4, emptying the rear middle supporting leg 3, hanging the rear middle supporting leg 3 to the rear pier top of the front auxiliary supporting leg 2 by the first main crown block 5, supporting the rear middle supporting leg 3, and installing the rear middle supporting leg 3 pier top anchoring device, wherein the following steps are required for hanging the rear middle supporting leg 3 through holes by the first main crown block 5: the front auxiliary crown block 2 moves to the front end of the main frame 1, (2) the lifting appliance of the first main crown block 5 is connected with the rear middle supporting leg 3, the rear middle supporting leg 3 is lifted by the first main crown block 5 to be empty, (3) the rear middle supporting leg 3 of the first main crown block 5 moves forward to a rear span middle position, the first main crown block 5 drives the middle supporting leg 3 to rotate 90 degrees clockwise and then move forward continuously, (4) the rear middle supporting leg 3 of the first main crown block 5 moves down to the front span middle position and rotates 90 degrees anticlockwise, and (5) the rear middle supporting leg 3 of the first main crown block 5 moves forward continuously to a pier top position behind the front auxiliary supporting leg;

(eight) disengaging the front auxiliary supporting leg 2 and the rear auxiliary supporting leg 4, running the first main crown block 5, the second main crown block 6 and the auxiliary crown block 7 to the front end of the bridge girder erection machine, and pushing the main frame to move forward by utilizing the longitudinal moving mechanism 3b of the middle supporting leg 3 until the main frame 1 moves forward to reach the girder erection position, so that the bridge girder erection machine is ready to pass holes again;

(ten) the first main crown block 5 and the second main crown block 6 are respectively opened to the vicinity of the upper parts of the front middle supporting leg 3 and the rear middle supporting leg 3, the middle supporting leg 3 traversing mechanism 3c is driven to adjust the main frame 1 of the bridge girder erection machine to a proper position in front of the through hole, and a connecting end crossing hole is prepared for carrying out, and the specific implementation steps are the same as those of the step (five);

eleven, the first main crown block 5, the second main crown block 6 and the auxiliary crown block 7 are operated to the tail part of the bridge girder erection machine, the middle supporting leg 3 longitudinally moving mechanism 3b pushes the main frame to move forward until the front auxiliary supporting leg 2 reaches the upper part of the front pier side supporting frame, and the front auxiliary supporting leg is supported on the pier side supporting frame, and the concrete implementation steps are the same as those in the step (six);

(twelve) placing one section beam at the top of the side span pier in place by using a first main crown block 5, wherein the first main crown block 5 is used for placing one section beam at the top of the side span pier in place according to the following steps; the method comprises the steps of (1) starting a front auxiliary crown block 2 to the front end of a main frame 1, enabling a first main crown block 5 to move forward for about 20m, (2) simultaneously using a second main crown block 6 to forward and transport a rear auxiliary supporting leg 4 to the rear of a middle supporting leg 3, temporarily hanging the rear auxiliary supporting leg onto the lower chord of the main frame 1 by using a threaded reinforcing steel bar, (3) using the second main crown block 6 to transport a section beam to the span of two middle supporting legs 3 and placing the section beam on a bridge deck, (4) returning the second main crown block 6 to the tail of the main frame 1 to continuously take beams, reconnecting a lifting appliance of the first main crown block 5 with the span inner section beam, (5) using the first main crown block 5 to transport the section beam to the vicinity of a front bridge pier, (6) enabling the first main crown block 5 to rotate the section beam by 90 degrees, (7) enabling the first main crown block 5 to place the front half section beam of the pier in place, and (8) temporarily supporting and fixing the section beam and the bridge pier;

Thirteenth, repeating the step (twelve) to mount the other section beam on the pier top in place, and temporarily anchoring the two pier top blocks, so that the pier top blocks can meet the supporting requirement of the middle supporting leg 3;

fourteen supports the rear auxiliary leg 4, the rear middle leg 3 is emptied, specifically according to the following steps: (1) The second main crown block 6 runs to the tail part of the main frame, the second main crown block 6 is utilized to transport the rear auxiliary supporting leg 4 backwards to a proper position and is bolted on the lower chord of the main frame to support the rear auxiliary supporting leg 4, (2) a lifting device which is connected with the lifting appliance of the first main crown block 5 and the rear middle supporting leg 3, and the first main crown block 5 lifts the rear middle supporting leg 3 to be empty;

fifteen, the first main crown block 5 is used for hoisting the middle support leg 3 at the rear to the pier top at the rear of the front auxiliary support leg 2, the concrete step of hoisting the support leg through holes at the rear is the same as the step of through holes in the step (seven), the first main crown block 5, the second main crown block 6 and the auxiliary crown block 7 are controlled to run to the front end of the bridge girder erection machine, the front auxiliary support leg 2 and the rear auxiliary support leg 4 are emptied, and the bridge girder erection machine is ready for through holes again;

sixthly, pushing the main frame by using the longitudinal moving mechanism 3b of the middle supporting leg 3, moving forward to reach the girder erecting position, constructing a joint end span, pouring a middle wet joint, and tensioning a whole span permanent stress steel beam, so that the joint construction is completed.

In the description of the present invention, it should be understood that the terms "center," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is for convenience only as well as for simplicity of description, and nothing more than a particular meaning of the terms is intended to be used unless otherwise stated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The construction method for the construction of the prefabricated segment beam under the complex working condition is characterized in that the construction method is based on a segment assembly bridge girder erection machine, and the segment assembly bridge girder erection machine comprises a main frame, a front auxiliary supporting leg, a rear auxiliary supporting leg, two middle supporting legs, a first main crown block, a second main crown block and two auxiliary crown blocks, wherein the first main crown block, the second main crown block and the two auxiliary crown blocks are arranged on the main frame and can move along the main frame;

the construction method comprises the following steps:

fourteen supporting the rear auxiliary leg, disengaging the rear middle leg;

2. The construction method for constructing the prefabricated section beam under the complex working condition according to claim 1, wherein in the step (one), the step (two) and the step (three), when the bridge girder erection machine carries out T-shaped suspension splicing, a front auxiliary crown block and a rear auxiliary crown block respectively hang a tensioning platform on two sides of the section beam to be installed, and serve as an operation platform of personnel, when a line is a curve, before the first main crown block and the second main crown block lift the section beam, the whole machine is transversely moved to a proper position in advance, so that the whole machine is prevented from being transversely moved under the condition that the first main crown block and the second main crown block lift the section beam;

3. The construction method for constructing the prefabricated section beam under the complex working condition according to claim 1, wherein in the step (four), the construction of hanging the first span section beam is carried out according to the following steps:

4. The construction method for constructing the prefabricated segmental beam under the complex working condition according to claim 1, wherein in the step (five) and the step (ten), when the bridge girder erection machine performs curve via hole, the middle support leg internal traversing mechanism is required to drive the shifting trolley to carry the main frame to transversely change an amplitude for a certain distance and control the shifting trolley to rotate for a certain angle, and the specific steps comprise:

5. The construction method for constructing a prefabricated segment beam under complex working conditions according to claim 1, wherein in the step (six) and the step (eleven), when the bridge girder erection machine is positioned on a front pier top or a pier side bracket at a curve segment via hole, the following steps are required:

6. The construction method for constructing the prefabricated segment beam under the complex working condition according to claim 1, wherein in the step (seventh) and the step (fifteen), the supporting leg through holes in the rear of the first main crown block hoisting are required to be formed according to the following steps:

(1) The front auxiliary crown block moves to the front end of the main frame 1;

7. The construction method for constructing the prefabricated segment beam under the complex working condition according to claim 6, wherein during the step of hoisting the landing leg via hole in the rear part by the first main crown block, the following steps are that:

8. The construction method for constructing prefabricated section beams under complex working conditions according to claim 1, wherein in the step (twelve), the first main crown block is used for placing one section beam of the side span pier top in place according to the following steps:

(6) The first main crown block rotates the segmental beams by 90 degrees;

(8) And temporarily supporting and fixing the segment beam and the bridge pier.

9. The construction method for constructing a prefabricated segment beam under complex working conditions according to claim 1, wherein in the step (fourteen), the rear auxiliary leg is supported, and the legs in the rear are removed by the following steps:

10. The construction method for constructing the prefabricated section beam under the complex working condition according to claim 1, wherein the first main crown block and the second main crown block comprise two first running mechanisms, a lifting hoisting mechanism and a hanging beam assembly, the two first running mechanisms adopt a tooth pin transmission mode, and the first main crown block and the second main crown block move above a main frame through the first running mechanisms; the lifting hoisting mechanism is connected with the hanging beam assembly through a steel wire rope, a three-dimensional adjusting device is arranged on the hanging beam assembly and used for adjusting the angle of the hanging beam assembly, and a member used for hoisting the front auxiliary supporting leg, the rear auxiliary supporting leg and the middle supporting leg is further arranged on the hanging beam assembly.