CN108330842B - Bridge girder erection machine for erection construction of large-span reinforced concrete composite girder and construction method - Google Patents
Bridge girder erection machine for erection construction of large-span reinforced concrete composite girder and construction method Download PDFInfo
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- CN108330842B CN108330842B CN201810353092.XA CN201810353092A CN108330842B CN 108330842 B CN108330842 B CN 108330842B CN 201810353092 A CN201810353092 A CN 201810353092A CN 108330842 B CN108330842 B CN 108330842B
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- 238000010276 construction Methods 0.000 title claims abstract description 56
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims description 17
- 210000001364 upper extremity Anatomy 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000017105 transposition Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention discloses a bridge girder erection machine for erection construction of a large-span reinforced concrete composite girder, which comprises a main frame, a supporting leg system, a front crane crown block, a rear crane crown block, auxiliary facilities, a hydraulic system and an electric control system, wherein the supporting leg system comprises a front supporting leg, a main supporting leg and a rear supporting leg which are longitudinally and sequentially arranged from front to rear below the main frame, and also comprises a hanging system for pre-stretching an erected girder, and the hanging system is connected to the bottom of the main frame; the lower end of the hanging system is fixed with the steel beam during bridging, the steel beam is pre-tensioned upwards, the main support leg comprises two sub legs, and each sub leg comprises a carrier roller, a guide mechanism, a supporting upright post, a first base, a transverse beam and a distributing beam; the main supporting legs are of symmetrical structures, and the guide mechanism plays a guide role in the sliding process of the main frame to prevent the main frame from deviating from the track. And paving a prefabricated bridge deck on the lifted steel beam, so as to meet the technological requirements of erection construction of the reinforced concrete composite beam.
Description
Technical Field
The invention relates to the technical field of engineering mechanical equipment, in particular to a bridge girder erection machine for whole-hole erection construction of a large-span reinforced concrete composite girder and a construction method, and particularly relates to construction suitable for a large-span highway bridge.
Background
Along with the deep construction of expressway traffic in China, more and more bridges which cross rivers, beaches, marshes and other difficult construction sites appear, and different from a common viaduct, the places are subjected to overhead bridge construction, the foundation construction investment of piers is relatively large, the construction condition is complex, the construction investment is reduced, the large-span bridge design is adopted, the investment is reduced in the large-span bridge construction, the erection quality is improved, and the higher requirement is provided for the adaptability of the bridge girder erection machine.
The bridge girder erection machine commonly used at the present stage cannot be suitable for the construction of the existing whole-collapse reinforced concrete composite girder. The existing bridge girder erection machine has limited application range, and a single span 80m whole-hole steel girder is the current maximum simple bridge span; the existing bridge girder erection machine cannot realize upward lifting of the erected steel girder, and a larger lifting force is provided without precedent; the existing steel-concrete combined bridge is mostly a cable-stayed bridge and a suspension bridge, the steel beam is welded after being hoisted in sections during construction, a bridge deck crane is generally adopted for hoisting operation, and the whole span steel beam is adopted for installation construction without precedents at present; the existing bridge girder erection machine is characterized in that steel rails are paved on a beam surface with multiple requirements in the passing hole running process, the designed steel girder is an open box-shaped section, and running mechanisms cannot be arranged on a bridge deck. In order to meet the innovative design requirement of the whole-hole erection of the steel-concrete combined box girder and meet the quality requirement of design construction, the development of economical, practical and efficient construction equipment is one of the best means for solving the problems aiming at the actual requirement.
Disclosure of Invention
The invention aims to provide a bridge girder erection machine for erection construction of a large-span steel-concrete composite girder, which can completely meet the requirements of erection construction of the large-span steel-concrete composite girder.
In order to achieve the above purpose, the following technical scheme is adopted.
The bridge girder erection machine for the large-span reinforced concrete composite girder erection construction comprises a main frame 1, a supporting leg system, a front crane crown block 5 and a rear crane crown block 7 for lifting a girder, an auxiliary facility 8, a hydraulic system 9 and an electric control system 10, wherein the front crane crown block 5 and the rear crane crown block 7 move on a top rail of the main frame 1.
The support leg system comprises a front support leg 2, a main support leg 3 and a rear support leg 4 which are sequentially arranged from front to back under the main frame 1 along the longitudinal direction, and further comprises a hanging system 6 for pre-stretching an erected steel beam, wherein the hanging system 6 is connected to the bottom of the main frame 1; the hanging system 6 consists of a plurality of hanging units, wherein each hanging unit comprises two short beams 6a, hanging screw ribs 6b vertically matched with the short beams 6a in a sliding manner, a jacking cylinder 6c, a swinging seat 6d and a middle beam 6e; the short cross beams 6a are hinged with the main frame 1 through the swinging seats 6d, the middle cross beam 6e is connected between the two short cross beams 6a, the lower ends of the hanging thread ribs 6b are used for fixing steel beams, the upper ends of the hanging thread ribs penetrate through the short cross beams 6a, the jacking cylinder 6c is fixed at the upper ends of the short cross beams 6a, and the jacking cylinder 6c drives the hanging thread ribs 6b to move up and down. During the hanging process, the lift cylinder provides an upward pulling force to the short cross beam 6 a.
The lower end of the hanging thread rib 6b is fixed with a steel beam during bridging, the steel beam is pre-tensioned upwards, a prefabricated bridge deck is paved on the steel beam, reinforced concrete is poured on the prefabricated bridge deck, and the pulling force on the hanging thread rib 6b is gradually increased in the pouring process until the maximum value is reached. The middle cross beam is arranged to be convenient to detach, so that the middle cross beam is flexibly detached during via hole or reverse construction, and interference is prevented.
The front crane 5 includes a front lifting system 5a for lifting the steel beam, a front longitudinal moving mechanism 5b for moving longitudinally along the main frame 1, a front traversing mechanism 5c for moving transversely along the main frame 1, and a front spreader 5d.
The rear crane 7 includes: a rear lifting system 7a, a rear longitudinal moving mechanism 7b, a rear transverse moving mechanism 7c and a rear lifting appliance 7d;
The main support leg 3 comprises two symmetrically arranged sub-legs, and each sub-leg comprises a carrier roller 3a, a guide mechanism 3b, a support upright 3c, a first base 3f, a transverse beam 3j and a distribution beam 3i which are sequentially and fixedly connected from top to bottom; a first adjusting oil cylinder 3e is arranged between the supporting upright post 3c and the first base 3f, an anchoring rod 3d is arranged on the outer side of the supporting upright post 3c, and a first traversing mechanism 3h is arranged on the inner side of the first base 3 f; the lower end of the distribution beam 3i is fixedly connected with the bridge pier, and the upper end of the distribution beam 3i is connected with the transverse beam 3j by a hinged support; the main frame 1 is in sliding connection with the carrier roller 3a, the upper end of the carrier roller 3a is fixedly connected with the guide mechanism 3b, a longitudinal pushing mechanism 3g is arranged on the inner side of the carrier roller 3a, sliding shoes are arranged on the longitudinal pushing mechanism 3g, rows of pin holes are formed in the side face of the main frame 1, and the longitudinal pushing mechanism 3g sequentially inserts the sliding shoes into the pin holes through sliding, so that the main frame 1 is pushed to step. The main support leg is of a symmetrical structure, and the guide mechanism 3b plays a guide role in the sliding process of the main frame to prevent the main frame from deviating from the track.
The main support legs 3 are provided in front and back along the main frame, and are referred to as a front main support leg 31 and a rear main support leg 32, respectively.
The front support leg 2 comprises a lower cross beam 2d, two symmetrical groups of front leg upright posts 2a, a shoulder pole beam 2b, a first guide post 2g, a second lifting cylinder 2c and a second base 2e are arranged on the lower cross beam, the first guide post 2g is fixedly connected with the second base 2e, the front leg upright posts 2a are slidably connected with the first guide post 2g, the middle part of the shoulder pole beam 2b is fixedly connected with the first guide post 2g, two ends of the shoulder pole beam 2a are fixedly connected with the second lifting cylinder 2c, the second lifting cylinder 2c drives the front leg upright posts 2a to slide relative to the first guide post 2g, a second transverse moving mechanism 2f which drives the second base 2e to move towards two sides is connected between the two second bases 2e, and the upper end of the front leg upright posts 2a are fixedly connected with the main frame 1 through a first upper cross beam 2 h.
The first traversing mechanism 3h comprises a first traversing oil cylinder 3h1 and a first connecting rod 3h2, the first connecting rod 3h2 is connected between two first bases 3f, the second traversing mechanism 2f comprises a second traversing oil cylinder 2f1 and a second connecting rod 2f2, and the second connecting rod 2f2 is connected between two second bases 2 e.
The rear leg 4 includes: the second upper cross beam 4c, the diagonal brace 4a, the rear leg upright post 4b, the third adjusting oil cylinder 4d, the second guide post 4f and the third base 4e; the upper end of the second upper cross beam 4c is fixedly connected with the main frame, the lower end of the second upper cross beam 4c is hinged with the rear leg upright post 4b, the inclined strut 4a is used for obliquely and fixedly pulling the rear leg upright post 4b and the main frame 1, the lower end of the second guide post 4f is fixedly connected with the third base 4e, the rear leg upright post 4b is slidably connected with the second guide post 4f, and the third adjusting oil cylinder 4d drives the rear leg upright post 4b to slide relative to the second guide post 4 f.
The main frame 1 comprises a main beam 1a and a connecting beam 1b; the front crane crown block 5 and the rear crane crown block 7 are driven by a motor reducer to longitudinally run along the main beam 1a, and the hanging system 6 is arranged at the top of the lower chord of the main beam 1a.
Typically the leg system supports the main frame 1, the front crane crown block 5 and the rear crane crown block 7 move on the top rail of the main frame 1, and the suspension system 6 is arranged above the lower chord of the main frame 1, perpendicular to the chord axis.
In the girder erecting state, the front supporting leg 2 and the main supporting leg 3 support the main frame 1, the front crane crown block 5 and the rear crane crown block 7 sequentially lift the girder body after the bridge erecting machine, the girder is longitudinally moved to the front span in a linkage way, and the girder is installed at a proper position through the longitudinally and transversely moving travelling mechanism and the lifting system of the front crane crown block 5 and the rear crane crown block 7, so that the welding between the girder and the front span girder is completed. The hanging system 6 prestretches a certain pulling force between the girder and the girder of the bridge girder erection machine, then the front crane crown block 5 and the rear crane crown block 7 are utilized to install the prefabricated bridge deck on the erected girder, the pulling force of the hanging system is increased to the final pulling force, the wet joints are connected between the prefabricated bridge deck plates, the bridge girder erection machine is ready to be perforated after the strength reaches the post-tensioning bridge deck, and the hanging system 6 is unloaded and is separated from the erected girder.
In the state of through holes, the two main support legs 3 drive the whole machine to move forwards by one hole to be in place, and the four support legs are matched and supported during the process, and the front crane trolley 5 is utilized to move the rear main support leg 3 forwards by one span.
The main frame 1 of the bridge girder erection machine is symmetrically designed, the two main support legs 3 have the same structure and function, and the front crane crown block 5 and the rear crane crown block 7 can move in the whole length range of the main frame 1 along the track arranged at the top of the main frame 1. When needed, the bridge girder erection machine can realize the reverse erection function by only adjusting the positions of the front supporting leg 2 and the rear supporting leg 4.
The construction method of the bridge girder erection machine for the construction of the large-span steel-concrete composite girder comprises the following steps:
1) Carrying out girder erection operation according to girder erection working procedures of the girder erection machine frame;
2) Performing via operation according to the via procedure of the bridge girder erection machine;
the girder erection process of the girder erection machine is sequentially carried out according to the following steps:
Step one:
1. The bridge girder erection machine is in a girder erection standing state;
2. Carrying the steel beam to a rear span of the bridge girder erection machine by the girder transporting vehicle;
3. The front lifting appliance of the front crane crown block 5 is connected with one end of the steel beam;
4. the front crane crown block 5 lifts one end of the steel beam to be separated from the front beam transporting vehicle;
Step two:
1. The front crane crown block 5 and the rear beam transporting vehicle move forwards in a linkage way, and the rear end of the steel beam stops after reaching the lower part of the rear crane crown block 7;
2. the lifting appliance of the rear crane crown block 7 is connected with the rear end of the steel beam;
3. The rear crane 7 lifts the rear end of the steel beam to be separated from the rear beam transporting vehicle;
Step three:
1. The front crane crown block 5 and the rear crane crown block 7 are linked to longitudinally move to a preset position;
2. The front crane crown block 5 and the rear crane crown block 7 move transversely to a preset position in a linkage way;
3. the front crane crown block 5 is linked with a lifting system of the rear crane crown block 7, and a steel beam is arranged at a preset position;
Step four:
1. welding and fixing one end of the newly installed steel beam with the previous span steel beam;
Step five:
1. fixedly connecting a suspension system 6 of the bridge girder erection machine with the newly-installed steel girder, and pre-stretching a certain tensile force;
2. installing the midspan prefabricated bridge deck onto the steel beam by utilizing the front crane crown block 5 and the rear crane crown block 7;
Step six:
1. loading the pretension force of the hanging system 6 on the bridge girder erection machine to the final design requirement;
2. Pouring a concrete wet joint between prefabricated bridge decks, and standing the bridge girder erection machine for equal strength;
step seven:
1. the front supporting leg 2 and the main supporting leg 3 of the bridge girder erection machine descend, and the whole machine is unloaded;
2. Unloading a hydraulic cylinder of the upper hanging system 6 of the bridge girder erection machine, and disconnecting the upper hanging system 6 of the bridge girder erection machine from the steel girder;
Step eight:
1. removing the middle cross beam 6e of the hanging system 6;
2. The bridge girder erection machine prepares the via hole.
The bridge girder erection machine via hole procedure is carried out according to the following steps in sequence:
Step one:
1. the front crane crown block 5 moves to the forefront end of the bridge girder erection machine along the erection direction;
2. The rear supporting leg 4 supports the bridge deck;
3. The main support leg 3 is transported to a front span by the rear crane crown block 7, stands well behind the front support leg 2, and the front support leg 2 is separated from the air;
Step two:
1. The rear crane 7 is moved to the front end of the bridge girder erection machine to approach the front crane 5;
2. The rear supporting leg 4 is separated from the bridge deck;
Step three:
1. The two main supporting legs 3 are supported by carrier rollers, and drive the oil cylinder to drive the main frame 1 of the bridge girder erection machine to pass through holes;
2. The bridge girder erection machine main frame 1 passes through the hole 20m, the front crane crown block 5 and the rear crane crown block 7 are retracted to the position above the front main supporting leg 31, the bridge girder erection machine continues to pass through the hole, and the crane crown blocks are retracted synchronously;
Step four:
1. Stopping the bridge girder erection machine through holes 35-55 m, and backing the front crane crown block 5 and the rear crane crown block 7 to the position above the rear main support leg 32;
2. the main frame 1 of the bridge girder erection machine continues to pass through the holes, and the front and rear crane trucks synchronously retreat;
Step five:
1. The bridge girder erection machine is longitudinally penetrated into place, and the front supporting leg 2 stands on the front pier top;
2. the front supporting leg 2 is lifted, and the elevation is consistent with that of the main supporting leg 3;
Step six:
1. the front crane crown block 5 moves to the position 16-20 m behind the main supporting leg 3;
2. the rear crane 7 moves to the position 1-3 m behind the main supporting leg 3;
3. and (5) conveying the girder to a rear span of the bridge girder erection machine by the girder conveying vehicle, and preparing for girder erection.
Performing steering operation according to reverse construction of the bridge girder erection machine, wherein the original erection direction is taken as the front, and the opposite direction is taken as the rear; the reverse construction operation of the bridge girder erection machine is carried out according to the following steps:
Step one:
1. After the construction of the last hole is finished, all the supporting legs are positioned above the beam surface;
2. Two sets of main support legs are arranged, the two sets of main support legs 3 are respectively a front main support leg 31 and a rear main support leg 32, and the two main support legs 3 and the front support leg 2 support the bridge crane main frame 1;
Step two:
1. the rear supporting leg 4 is supported, the front crane 5 transfers the rear main supporting leg 32 to the position 8m in front of the rear pier top for supporting, and the front crane 5 moves to the forefront end of the bridge girder erection machine;
2. the rear supporting leg 4 is separated from the air, the rear main supporting leg 32 is supported, the rear crane crown block 7 lifts the rear supporting leg 4 to the position 1m behind the front supporting leg 2 for installation, and the inclined support is not installed;
Step three:
1. the rear supporting leg 3 is supported, and the front crane crown block 5 lifts the front supporting leg 2 to be transported to the rear span for installation;
Step four:
1. The front supporting leg 2 is supported, the front crane crown block 5 lifts the rear main supporting leg 32 to be transferred to the rear of the front main supporting leg 31 for supporting, and the front main supporting leg 31 is rotated by 90 degrees for supporting;
Step five:
1. the front crane crown block 5 is used for lifting the rear main support leg 32 to the rear of the rear support leg 4 for installation;
2. The rear main support leg 32 is supported, and the rear support leg 4 is installed to be inclined; at this time, the mutual transposition of the front supporting leg 2 and the rear supporting leg 4 of the bridge girder erection machine is completed; the direction conversion of the main support leg 3 is completed;
Step six:
1. the main support leg 3, the front support leg 2 and the rear support leg 4 are adjusted to be connected in a line manner;
2. The front crane crown block 5 is used to adjust the suspension system 6 to a predetermined position for reinstallation. Thus, the reverse construction adjustment of the bridge girder erection machine is completed.
Compared with the prior art:
the bridge girder erection machine can be used for firstly installing the steel girder, paving the prefabricated bridge deck on the lifted steel girder, and pouring the concrete girder on the two bases so as to meet the technological requirements of erection construction of the reinforced concrete composite girder. The reverse construction can be completed without the assistance of a large-tonnage crane; the whole structure of the bridge girder erection machine adopts a set of main frame 1 and four-leg structure, and the main frame 1 is designed in a longitudinal and transverse full-symmetry way. The front support leg 2 and the rear support leg 4 are fixed support legs, the front support leg 2 has a transverse movement function, the main support leg 3 is a movable support leg, the carrier roller wheels are directly contacted with rail square steel of the lower chord of the main beam 1a, and the whole machine has the transverse movement function, so that the construction of a curve bridge is satisfied; the front crane crown block 5 and the rear crane crown block 7 are provided with a longitudinal and transverse moving mechanism, and the motor speed reducer drives the crown block to longitudinally move along the main beam 1a or transversely move on the transverse beam so as to meet the longitudinal and transverse adjustment of the position of the steel beam; the bridge girder erection machine hanging system 6 can provide upward lifting force for the steel girder, so that the bridge structure is optimized, and the steel quantity for steel girder design is reduced; the bridge girder erection machine can complete the erection of a left double-width bridge and a right double-width bridge at each via hole station. Can improve the production and construction efficiency and the effective utilization rate of the materials.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a block diagram of a hanging device;
FIG. 3 is a block diagram of a front leg;
FIG. 4 is a block diagram of a primary leg;
FIG. 5 is a right side view of FIG. 4;
FIG. 6 is a block diagram of the rear leg;
FIG. 7 is a right side view of FIG. 6;
FIG. 8 is a partial top view of the main frame;
FIG. 9 is a block diagram of a front crane;
FIG. 10 is a block diagram of a rear overhead travelling crane;
FIG. 11 is a beam transporting state diagram of the bridge girder erection machine;
Fig. 12 is a view showing a hanging state of the steel beam.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, a bridge girder erection machine for erection construction of a large-span reinforced concrete composite girder comprises a main frame 1, a supporting leg system, a front crane crown block 5 and a rear crane crown block 7 for lifting a girder, an auxiliary facility 8, a hydraulic system 9 and an electric control system 10, wherein the front crane crown block 5 and the rear crane crown block 7 move on a top rail of the main frame 1.
Depending on the functional requirements of the complete machine, the hydraulic system 9 comprises: the hydraulic system comprises a front supporting leg hydraulic system, a main supporting leg hydraulic system, a rear supporting leg hydraulic system, a hanging hydraulic system, a crown block hydraulic system and the like.
The working principle of the hydraulic system 9 is as follows: the motor is started, the hydraulic station drives the motor to drive the axial variable plunger pump through the coupler, the electromagnetic overflow valve is in a power-off state at the moment, pressure oil discharged by the pump directly returns to the oil tank through the overflow valve at lower pressure, so that the motor is started in an idle load mode, the starting current is low, and a hydraulic system is free from impact; and starting corresponding buttons, simultaneously electrifying the electromagnetic reversing valve and the overflow valve, and enabling high-pressure oil to pass through the pump, the electromagnetic reversing valve and the oil cylinder to overcome the load. The pump station adopts electric control nearby operation. The oil cylinders controlled by each pump station can be linked and controlled in a single action.
The bridge girder erection machine electrical control system 10 adopts a modularized control mode, and the electrical control system 10 comprises: the hydraulic power generation system comprises a main supporting leg control part, a crown block control part and a hydraulic pump station control part. The motor of each running and lifting part is braked by the electromagnetic band-type brake. The hydraulic pump station control system mainly comprises a local operation box, and is safe and reliable and convenient to maintain.
The leg system comprises a front leg 2, a main leg 3, and a rear leg 4 arranged longitudinally in sequence from front to rear under the main frame 1. Also comprises a hanging system 6 for pretensioning the erected steel girder.
As shown in fig. 2, the hanging system 6 is connected to the bottom of the main frame 1; the hanging system 6 consists of a plurality of hanging units, wherein each hanging unit comprises two short beams 6a, hanging screw ribs 6b vertically matched with the short beams 6a in a sliding manner, a jacking cylinder 6c, a swinging seat 6d and a middle beam 6e; the short cross beams 6a are hinged with the main frame 1 through the swinging seats 6d, the middle cross beam 6e is connected between the two short cross beams 6a, the lower ends of the hanging thread ribs 6b are used for fixing steel beams, the upper ends of the hanging thread ribs penetrate through the short cross beams 6a, the jacking cylinder 6c is fixed at the upper ends of the short cross beams 6a, and the jacking cylinder 6c drives the hanging thread ribs 6b to move up and down.
The lower end of the hanging thread rib 6b is fixed with a steel beam during bridging, the steel beam is pre-tensioned upwards, a prefabricated bridge deck is paved on the steel beam, reinforced concrete is poured on the prefabricated bridge deck, and the pulling force on the hanging thread rib 6b is gradually increased in the pouring process until the maximum value is reached. The middle cross beam is arranged to be convenient to detach, so that the middle cross beam is flexibly detached during via hole or reverse construction, and interference is prevented.
As shown in fig. 9, the front crane 5 includes a front lifting system 5a for lifting the steel beam, a front longitudinal movement mechanism 5b for moving longitudinally along the main frame 1, a front traversing mechanism 5c for moving laterally along the main frame 1, and a front spreader 5d.
As shown in fig. 10, the rear crane 7 includes: a rear lifting system 7a, a rear longitudinal moving mechanism 7b, a rear transverse moving mechanism 7c and a rear lifting appliance 7d.
As shown in fig. 4 and 5, the main support leg 3 comprises two symmetrically arranged sub-legs, and each sub-leg comprises a carrier roller 3a, a guide mechanism 3b, a support upright 3c, a first base 3f, a transverse beam 3j and a distribution beam 3i which are sequentially and fixedly connected from top to bottom; a first adjusting oil cylinder 3e is arranged between the supporting upright post 3c and the first base 3f, an anchoring rod 3d is arranged on the outer side of the supporting upright post 3c, and a first traversing mechanism 3h is arranged on the inner side of the first base 3 f; the lower end of the distribution beam 3i is fixedly connected with the bridge pier, and the upper end of the distribution beam 3i is connected with the transverse beam 3j by a hinged support; the main frame 1 is in sliding connection with the carrier roller 3a, the upper end of the carrier roller 3a is fixedly connected with the guide mechanism 3b, a longitudinal pushing mechanism 3g is arranged on the inner side of the carrier roller 3a, sliding shoes are arranged on the longitudinal pushing mechanism 3g, rows of pin holes are formed in the side face of the main frame 1, and the longitudinal pushing mechanism 3g sequentially inserts the sliding shoes into the pin holes through sliding, so that the main frame 1 is pushed to step.
The main leg 3 is provided with two, respectively called a front main leg 31 and a rear main leg 32, along the front and rear of the main frame.
As shown in fig. 3, the front support leg 2 includes a lower beam 2d, two symmetrical groups of front leg upright posts 2a, a shoulder pole beam 2b, a first guide post 2g, a second lifting cylinder 2c and a second base 2e are arranged on the lower beam, the first guide post 2g is fixedly connected with the second base 2e, the front leg upright posts 2a are slidably connected with the first guide post 2g, the middle part of the shoulder pole beam 2b is fixedly connected with the first guide post 2g, two ends of the shoulder pole beam 2b are respectively fixedly connected with the second lifting cylinder 2c, the second lifting cylinder 2c drives the front leg upright posts 2a to slide relative to the first guide post 2g, a second traversing mechanism 2f which drives the second base 2e to move towards two sides is connected between the two second bases 2e, and the upper end of the front leg upright posts 2a is fixedly connected with the main frame 1 through a first upper beam 2 h.
The first traversing mechanism 3h comprises a first traversing oil cylinder 3h1 and a first connecting rod 3h2, the first connecting rod 3h2 is connected between two first bases 3f, the second traversing mechanism 2f comprises a second traversing oil cylinder 2f1 and a second connecting rod 2f2, and the second connecting rod 2f2 is connected between two second bases 2 e.
As shown in fig. 6 and 7, the rear leg 4 includes: the second upper cross beam 4c, the diagonal brace 4a, the rear leg upright post 4b, the third adjusting oil cylinder 4d, the second guide post 4f and the third base 4e; the upper end of the second upper cross beam 4c is fixedly connected with the main frame, the lower end of the second upper cross beam 4c is hinged with the rear leg upright post 4b, the inclined strut 4a is used for obliquely and fixedly pulling the rear leg upright post 4b and the main frame 1, the lower end of the second guide post 4f is fixedly connected with the third base 4e, the rear leg upright post 4b is slidably connected with the second guide post 4f, and the third adjusting oil cylinder 4d drives the rear leg upright post 4b to slide relative to the second guide post 4 f.
The main frame 1 shown in fig. 8 includes a main beam 1a and a connecting beam 1b; the front crane crown block 5 and the rear crane crown block 7 are driven by a motor reducer to longitudinally run along the main beam 1a, and the hanging system 6 is arranged at the top of the lower chord of the main beam 1 a.
Typically the leg system supports the main frame 1, the front crane crown block 5 and the rear crane crown block 7 move on the top rail of the main frame 1, and the suspension system 6 is arranged above the lower chord of the main frame 1, perpendicular to the chord axis.
As shown in fig. 11 and 12, in the girder erecting state, the front support leg 2 and the main support leg 3 support the main frame 1, the front crane crown block 5 and the rear crane crown block 7 sequentially lift the girder body after the bridge erecting machine, the girder is longitudinally moved to the front span in a linkage manner, and the girder is installed at a proper position through the longitudinally and transversely moving running mechanisms and the lifting systems of the front crane crown block 5 and the rear crane crown block 7 to complete the welding between the girder and the front span girder. The hanging system 6 prestretches a certain pulling force between the girder and the girder of the bridge girder erection machine, then the front crane crown block 5 and the rear crane crown block 7 are utilized to install the prefabricated bridge deck on the erected girder, the pulling force of the hanging system is increased to the final pulling force, the wet joints are connected between the prefabricated bridge deck plates, the bridge girder erection machine is ready to be perforated after the strength reaches the post-tensioning bridge deck, and the hanging system 6 is unloaded and is separated from the erected girder.
In the state of through holes, the two main support legs 3 drive the whole machine to move forwards by one hole to be in place, and the four support legs are matched and supported during the process, and the front crane trolley 5 is utilized to move the rear main support leg 3 forwards by one span.
The main frame 1 of the bridge girder erection machine is symmetrically designed, the two main support legs 3 have the same structure and function, and the front crane crown block 5 and the rear crane crown block 7 can move in the whole length range of the main frame 1 along the track arranged at the top of the main frame 1. When needed, the bridge girder erection machine can realize the reverse erection function by only adjusting the positions of the front supporting leg 2 and the rear supporting leg 4.
The construction method of the bridge girder erection machine for the construction of the large-span steel-concrete composite girder comprises the following steps:
1, girder erection operation is carried out according to a girder erection procedure of a girder erection machine frame;
And 2, performing hole passing operation according to the hole passing procedure of the bridge girder erection machine.
The girder erection process of the girder erection machine is sequentially carried out according to the following steps:
Step one:
1. The bridge girder erection machine is in a girder erection standing state;
2. Carrying the steel beam to a rear span of the bridge girder erection machine by the girder transporting vehicle;
3. The front lifting appliance of the front crane crown block 5 is connected with one end of the steel beam;
4. the front crane crown block 5 lifts one end of the steel beam to be separated from the front beam transporting vehicle;
Step two:
1. The front crane crown block 5 and the rear beam transporting vehicle move forwards in a linkage way, and the rear end of the steel beam stops after reaching the lower part of the rear crane crown block 7;
2. the lifting appliance of the rear crane crown block 7 is connected with the rear end of the steel beam;
3. The rear crane 7 lifts the rear end of the steel beam to be separated from the rear beam transporting vehicle;
Step three:
1. The front crane crown block 5 and the rear crane crown block 7 are linked to longitudinally move to a preset position;
2. The front crane crown block 5 and the rear crane crown block 7 move transversely to a preset position in a linkage way;
3. the front crane crown block 5 is linked with a lifting system of the rear crane crown block 7, and a steel beam is arranged at a preset position;
Step four:
1. welding and fixing one end of the newly installed steel beam with the previous span steel beam;
Step five:
1. fixedly connecting a suspension system 6 of the bridge girder erection machine with the newly-installed steel girder, and pre-stretching a certain tensile force;
2. installing the midspan prefabricated bridge deck onto the steel beam by utilizing the front crane crown block 5 and the rear crane crown block 7;
Step six:
1. loading the pretension force of the hanging system 6 on the bridge girder erection machine to the final design requirement;
2. Pouring a concrete wet joint between prefabricated bridge decks, and standing the bridge girder erection machine for equal strength;
step seven:
1. the front supporting leg 2 and the main supporting leg 3 of the bridge girder erection machine are lowered, and the whole machine is unloaded;
2. Unloading a hydraulic cylinder of the upper hanging system 6 of the bridge girder erection machine, and disconnecting the upper hanging system 6 of the bridge girder erection machine from the steel girder;
Step eight:
1. removing the middle cross beam 6e of the hanging system 6;
2. The bridge girder erection machine prepares the via hole.
The bridge girder erection machine via hole procedure is carried out according to the following steps in sequence:
Step one:
1. the front crane crown block 5 moves to the forefront end of the bridge girder erection machine along the erection direction;
2. The rear supporting leg 4 supports the bridge deck;
3. The main support leg 3 is transported to a front span by the rear crane crown block 7, stands well behind the front support leg 2, and the front support leg 2 is separated from the air;
Step two:
1. The rear crane 7 is moved to the front end of the bridge girder erection machine to approach the front crane 5;
2. The rear supporting leg 4 is separated from the bridge deck;
Step three:
1. The two main supporting legs 3 are supported by carrier rollers, and drive the oil cylinder to drive the main frame 1 of the bridge girder erection machine to pass through holes;
2. The bridge girder erection machine main frame 1 passes through the hole 20m, the front crane crown block 5 and the rear crane crown block 7 are retracted to the position above the front main supporting leg 31, the bridge girder erection machine continues to pass through the hole, and the crane crown blocks are retracted synchronously;
Step four:
1. Stopping the bridge girder erection machine through holes 35-55 m, and backing the front crane crown block 5 and the rear crane crown block 7 to the position above the rear main support leg 32;
2. the main frame 1 of the bridge girder erection machine continues to pass through the holes, and the front and rear crane trucks synchronously retreat;
Step five:
1. The bridge girder erection machine is longitudinally penetrated into place, and the front supporting leg 2 stands on the front pier top;
2. the front supporting leg 2 is lifted, and the elevation is consistent with that of the main supporting leg 3;
Step six:
1. the front crane crown block 5 moves to the position 16-20 m behind the main supporting leg 3;
2. the rear crane 7 moves to the position 1-3 m behind the main supporting leg 3;
3. and (5) conveying the girder to a rear span of the bridge girder erection machine by the girder conveying vehicle, and preparing for girder erection.
The method also comprises the steps of: performing steering operation according to reverse construction of the bridge girder erection machine, wherein the original erection direction is taken as the front, and the opposite direction is taken as the rear; the reverse construction operation of the bridge girder erection machine is carried out according to the following steps:
Step one:
1. After the construction of the last hole is finished, all the supporting legs are positioned above the beam surface;
2. Two sets of main support legs are arranged, the two sets of main support legs 3 are respectively a front main support leg 31 and a rear main support leg 32, and the two main support legs 3 and the front support leg 2 support the bridge crane main frame 1;
Step two:
1. the rear supporting leg 4 is supported, the front crane 5 transfers the rear main supporting leg 32 to the position 8m in front of the rear pier top for supporting, and the front crane 5 moves to the forefront end of the bridge girder erection machine;
2. the rear supporting leg 4 is separated from the air, the rear main supporting leg 32 is supported, the rear crane crown block 7 lifts the rear supporting leg 4 to the position 1m behind the front supporting leg 2 for installation, and the inclined support is not installed;
Step three:
1. the rear supporting leg 3 is supported, and the front crane crown block 5 lifts the front supporting leg 2 to be transported to the rear span for installation;
Step four:
1. The front supporting leg 2 is supported, the front crane crown block 5 lifts the rear main supporting leg 32 to be transferred to the rear of the front main supporting leg 31 for supporting, and the front main supporting leg 31 is rotated by 90 degrees for supporting;
Step five:
1. the front crane crown block 5 is used for lifting the rear main support leg 32 to the rear of the rear support leg 4 for installation;
2. The rear main support leg 32 is supported, and the rear support leg 4 is installed to be inclined; at this time, the mutual transposition of the front supporting leg 2 and the rear supporting leg 4 of the bridge girder erection machine is completed; the direction conversion of the main support leg 3 is completed;
Step six:
1. the main support leg 3, the front support leg 2 and the rear support leg 4 are adjusted to be connected in a line manner;
2. The front crane crown block 5 is used to adjust the suspension system 6 to a predetermined position for reinstallation. Thus, the reverse construction adjustment of the bridge girder erection machine is completed.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. The bridge girder erection machine for the large-span reinforced concrete composite girder erection construction comprises a main frame (1), a supporting leg system, a front crane crown block (5) and a rear crane crown block (7) for lifting a girder, auxiliary facilities (8), a hydraulic system (9) and an electric control system (10), wherein the front crane crown block (5) and the rear crane crown block (7) move on a top rail of the main frame (1); the landing leg system comprises a front landing leg (2), a main supporting leg (3) and a rear landing leg (4) which are sequentially arranged from front to back under the main frame (1) along the longitudinal direction, and is characterized in that:
The steel beam pre-tensioning device further comprises a hanging system (6) for pre-tensioning the erected steel beam, and the hanging system (6) is connected to the bottom of the main frame (1); the hanging system (6) consists of a plurality of hanging units, wherein each hanging unit comprises two short cross beams (6 a), hanging thread ribs (6 b) vertically matched with the short cross beams (6 a) in a sliding manner, a jacking cylinder (6 c), a swinging seat (6 d) and a middle cross beam (6 e); the short beams (6 a) are hinged with the main frame (1) through swing seats (6 d), the middle beam (6 e) is connected between the two short beams (6 a), the lower ends of the hanging thread ribs (6 b) are used for fixing steel beams, the upper ends of the hanging thread ribs penetrate through the short beams (6 a), the lifting oil cylinders (6 c) are fixed at the upper ends of the short beams (6 a), and the lifting oil cylinders (6 c) drive the hanging thread ribs (6 b) to move up and down;
The main support leg (3) comprises two symmetrically arranged sub-legs, and each sub-leg comprises a carrier roller (3 a), a guide mechanism (3 b), a support column (3 c), a first base (3 f), a transverse beam (3 j) and a distribution beam (3 i) which are sequentially and fixedly connected from top to bottom; a first adjusting oil cylinder (3 e) is arranged between the supporting upright post (3 c) and the first base (3 f), an anchoring rod (3 d) is arranged at the outer side of the supporting upright post (3 c), and a first transverse moving mechanism (3 h) is arranged at the inner side of the first base (3 f); the lower end of the distribution beam (3 i) is fixedly connected with the bridge pier, and the upper end of the distribution beam (3 i) is connected with the transverse beam (3 j) through a hinged support; the main frame (1) is in sliding connection with the carrier roller (3 a), the upper end of the carrier roller (3 a) is fixedly connected with the guide mechanism (3 b), a longitudinal pushing mechanism (3 g) is arranged on the inner side of the carrier roller (3 a), sliding shoes are arranged on the longitudinal pushing mechanism (3 g), rows of pin holes are formed in the side face of the main frame (1), and the longitudinal pushing mechanism (3 g) is sequentially inserted into the pin holes through the sliding shoes to push the main frame (1) to step;
The main support legs (3) are arranged in front of and behind the main frame and are respectively called a front main support leg (31) and a rear main support leg (32).
2. The bridge girder erection machine for erection construction of large-span steel-concrete composite girders according to claim 1, wherein: the front support leg (2) comprises a lower cross beam (2 d), two groups of symmetrical front leg upright posts (2 a), a shoulder pole beam (2 b), a first guide post (2 g), a second lifting cylinder (2 c) and a second base (2 e) are arranged on the lower cross beam (2 d), the first guide post (2 g) is fixedly connected with the second base (2 e), the front leg upright posts (2 a) are slidably connected with the first guide post (2 g), the middle part of the shoulder pole beam (2 b) is fixedly connected with the first guide post (2 g), two ends of the shoulder pole beam are fixedly connected with the second lifting cylinder (2 c), the second lifting cylinder (2 c) drives the front leg upright posts (2 a) to slide relative to the first guide post (2 g), the second base (2 e) is connected between the two second bases (2 e) to drive the second traversing mechanisms (2 f) moving towards two sides, and the upper ends of the front leg upright posts (2 a) are fixedly connected with the main frame (1) through the first upper cross beam (2 h).
3. The bridge girder erection machine for erection construction of large-span steel-concrete composite girders according to claim 2, wherein: the first transverse moving mechanism (3 h) comprises a first transverse moving oil cylinder (3 h 1) and a first connecting rod (3 h 2), the first connecting rod (3 h 2) is connected between two first bases (3 f), the second transverse moving mechanism (2 f) comprises a second transverse moving oil cylinder (2 f 1) and a second connecting rod (2 f 2), and the second connecting rod (2 f 2) is connected between two second bases (2 e).
4. The bridge girder erection machine for erection construction of large-span steel-concrete composite girders according to claim 1, wherein: the rear leg (4) comprises: the second upper cross beam (4 c), the diagonal brace (4 a), the rear leg upright post (4 b), the third adjusting oil cylinder (4 d), the second guide post (4 f) and the third base (4 e); the upper end of a second upper cross beam (4 c) is fixedly connected with the main frame, the lower end of the second upper cross beam (4 c) is hinged with a rear leg upright post (4 b), an inclined strut (4 a) is used for obliquely fixing the rear leg upright post (4 b) with the main frame (1), the lower end of a second guide post (4 f) is fixedly connected with a third base (4 e), the rear leg upright post (4 b) is slidably connected with the second guide post (4 f), and a third adjusting oil cylinder (4 d) drives the rear leg upright post (4 b) to slide relative to the second guide post (4 f).
5. The bridge girder erection machine for erection construction of large-span steel-concrete composite girders according to claim 1, wherein: the front crane crown block (5) comprises a front lifting system (5 a) for lifting the steel beam, a front longitudinal moving mechanism (5 b) longitudinally moving along the main frame (1), a front transverse moving mechanism (5 c) transversely moving along the main frame (1) and a front lifting appliance (5 d); the rear crane crown block (7) comprises: the rear lifting system (7 a), the rear longitudinal moving mechanism (7 b), the rear transverse moving mechanism (7 c) and the rear lifting appliance (7 d).
6. The bridge girder erection machine for erection construction of large-span steel-concrete composite girders according to claim 5, wherein: the main frame (1) comprises a main beam (1 a) and a connecting beam (1 b); the front crane crown block (5) and the rear crane crown block (7) are driven by a motor reducer to longitudinally run along the main beam (1 a), and the hanging system (6) is arranged at the top of the lower chord member of the main beam (1 a).
7. The construction method of the bridge girder erection machine for the erection construction of the large-span steel-concrete composite girder according to any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
Carrying out girder erection operation according to girder erection working procedures of the girder erection machine frame;
performing via operation according to the via procedure of the bridge girder erection machine;
the girder erection process of the girder erection machine is sequentially carried out according to the following steps:
Step one:
1. The bridge girder erection machine is in a girder erection standing state;
2. Carrying the steel beam to a rear span of the bridge girder erection machine by the girder transporting vehicle;
3. the front lifting appliance of the front crane crown block (5) is connected with one end of the steel beam;
4. a front crane crown block (5) lifts one end of the steel beam to be separated from the front beam transporting vehicle;
Step two:
1. the front crane crown block (5) and the rear beam transporting vehicle move forwards in a linkage way, and the rear end of the steel beam stops after reaching the lower part of the rear crane crown block (7);
2. The lifting appliance of the rear crane crown block (7) is connected with the rear end of the steel beam;
3. A rear crane crown block (7) lifts the rear end of the steel beam to be separated from the rear beam transporting vehicle;
Step three:
1. the front crane crown block (5) and the rear crane crown block (7) are linked to longitudinally move to a preset position;
2. The front crane crown block (5) and the rear crane crown block (7) are in linkage and transversely moved to a preset position;
3. the front crane crown block (5) is linked with a lifting system of the rear crane crown block (7), and the steel beam is arranged at a preset position;
Step four:
1. welding and fixing one end of the newly installed steel beam with the previous span steel beam;
Step five:
1. Fixedly connecting a suspension system (6) of the bridge girder erection machine with the newly-installed steel girder, and pre-stretching a certain tensile force;
2. Installing the midspan prefabricated bridge deck onto the steel beam by utilizing the front crane crown block (5) and the rear crane crown block (7);
Step six:
1. Loading the pretension force of a hanging system (6) on the bridge girder erection machine to the final design requirement;
2. Pouring a concrete wet joint between prefabricated bridge decks, and standing the bridge girder erection machine for equal strength;
step seven:
1. Unloading a hydraulic cylinder of a hanging system (6) on the bridge girder erection machine, and removing the connection between the steel girder and the hanger;
Step eight:
1. removing the middle cross beam (6 e) of the hanging system (6);
2. Preparing a via hole by a bridge girder erection machine;
The bridge girder erection machine via hole procedure is carried out according to the following steps in sequence:
Step one:
1. the front crane crown block (5) moves to the forefront end of the bridge girder erection machine along the erection direction;
2. the rear supporting leg (4) supports the bridge deck;
3. The rear crane crown block (7) transfers the front main supporting leg (31) to the front span, stands well behind the front supporting leg (2), and the front supporting leg (2) is emptied;
Step two:
1. the rear crane crown block (7) is moved to the front end of the bridge girder erection machine to approach the front crane crown block (5);
2. separating the rear supporting leg (4) from the bridge deck;
Step three:
1. The two main supporting legs (3) are supported by carrier rollers, the pushing oil cylinder is driven, and the main frame (1) of the bridge girder erection machine is provided with through holes;
2. The bridge girder erection machine main frame (1) is penetrated by a distance, the front crane crown block (5) and the rear crane crown block (7) are retracted to the upper part of the front main supporting leg (31), the bridge girder erection machine is continued to penetrate through the holes, and the crane crown blocks are retracted synchronously;
Step four:
1. stopping after passing through the hole of the bridge girder erection machine for a certain distance, and retreating the front crane crown block (5) and the rear crane crown block (7) to the position above the rear main support leg (32);
2. The main frame (1) of the bridge girder erection machine continues to pass through the holes, and the front crane and the rear crane synchronously retreat;
Step five:
1. The bridge girder erection machine is longitudinally penetrated into place, and the front supporting leg (2) stands on the top of the front pier;
2. the front supporting leg (2) is lifted, and the elevation is consistent with that of the main supporting leg (3);
Step six:
1. the front crane crown block (5) moves to the rear of the rear main support leg (32);
2. the rear crane crown block (7) moves to the rear of the rear main support leg (32);
3. and (5) conveying the girder to a rear span of the bridge girder erection machine by the girder conveying vehicle, and preparing for girder erection.
8. The construction method of the bridge girder erection machine for the erection construction of the large-span steel-concrete composite girder, which is characterized by comprising the following steps of: the method also comprises the steps of: performing steering operation according to reverse construction of the bridge girder erection machine, wherein the original erection direction is taken as the front, and the opposite direction is taken as the rear; the reverse construction operation of the bridge girder erection machine is carried out according to the following steps:
Step one:
1. After the construction of the last hole is finished, all the supporting legs are positioned above the beam surface;
2. Two sets of main support legs are arranged, the two sets of main support legs (3) are respectively a front main support leg (31) and a rear main support leg (32), and the two main support legs (3) and the front support leg (2) support the bridge machine main frame (1);
Step two:
1. The rear supporting leg (4) is supported, the front crane crown block (5) transfers the rear main supporting leg (32) to the position 8m in front of the rear pier top for supporting, and the front crane crown block (5) moves to the forefront end of the bridge girder erection machine;
2. The rear supporting leg (4) is separated from the air, the rear main supporting leg (32) is supported, the rear supporting leg (4) is lifted to the position 1m behind the front supporting leg (2) by the rear crane crown block (7), and the inclined support is temporarily not installed;
Step three:
1. the rear main support leg (32) is supported, and the front crane crown block (5) is used for lifting the front support leg (2) and transferring the front support leg to the rear span for installation;
Step four:
1. The front supporting leg (2) is supported, the front crane crown block (5) lifts the rear main supporting leg (32) to be transferred to the rear of the front main supporting leg (31) for supporting, and the front main supporting leg (31) is rotated for 90 degrees for supporting;
Step five:
1. the front crane crown block (5) is used for lifting the rear main support leg (32) to the rear of the rear support leg (4);
2. The rear main support leg (32) is supported, and the rear support leg (4) is installed for inclined support; at the moment, the mutual transposition of the front supporting leg (2) and the rear supporting leg (4) of the bridge girder erection machine is completed; the direction conversion of the main support leg (3) is completed;
Step six:
1. the main supporting leg (3), the front supporting leg (2) and the rear supporting leg (4) are adjusted to be connected in a line manner;
2. And adjusting the hanging system (6) to a preset position by using the front crane crown block (5) for reinstallation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810353092.XA CN108330842B (en) | 2018-04-19 | 2018-04-19 | Bridge girder erection machine for erection construction of large-span reinforced concrete composite girder and construction method |
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| CN201810353092.XA CN108330842B (en) | 2018-04-19 | 2018-04-19 | Bridge girder erection machine for erection construction of large-span reinforced concrete composite girder and construction method |
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