CN112411380A - Multi-machine combined-hoisting river-crossing erection construction method for prefabricated box girder - Google Patents
Multi-machine combined-hoisting river-crossing erection construction method for prefabricated box girder Download PDFInfo
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Abstract
The invention discloses a multi-machine combined-hoisting river-crossing erection construction method for a prefabricated box girder, belongs to the technical field of bridge construction, is mainly used for bridge prefabricated girder erection construction, and is particularly applicable to urban bridge box girder erection construction with less engineering quantity, lighter girder body dead weight and lack of a middle-crossing sidewalk. The hanging beam is mainly provided with an automobile crane, a beam transporting vehicle, a sprinkler, a tank car, an arm support pump, an electric welding machine, a cutting machine and an insertion vibrator. Which comprises the following steps: firstly, transporting a box girder; secondly, positioning a crane; thirdly, bundling the beams; fourthly, positioning the feeding beam and the hanging beam; fifthly, fixing the beam body; and sixthly, pouring and maintaining the wet joint. The invention and the construction equipment for the girder erection of the bridge girder erection machine by the double-guide-rail method have the advantages that: the landing leg is used immediately, the maneuvering is flexible, the construction speed is high, and the method is suitable for projects with small engineering quantity; the single-double guide beam method is long in assembling and acceptance time, high in entrance cost and good in construction safety, and is more suitable for beam erecting projects with large project quantities.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a multi-machine combined-hoisting river-crossing erection construction method for a prefabricated box girder.
Background
In the field of bridge prefabricated beam frame facilities, actual conditions are combined on site, and in the construction process of erecting urban bridge box girders with small engineering quantity, light beam body dead weight and lack of midspan sidewalks, if the traditional single-double guide beam method is adopted for erection, the cost is higher, the construction period is longer, the construction difficulty is higher, higher safety risks exist, and the site coordination is more complicated and difficult.
Aiming at the outstanding problem, the invention provides a method for erecting and constructing by adopting a multi-machine combined hoisting method, which reduces the cost and shortens the construction period compared with the method for erecting by adopting a single guide beam and a double guide beam, and has obvious construction advantages. The construction method for erecting the river-crossing bridge by multi-machine combined hoisting of the prefabricated box girder has the obvious advantages of using the landing legs for entering a field, being flexible and economical, being fast in construction and the like.
Before the construction of box girder erection, the method firstly determines the total load of hoisting and the safety coefficient of a crane under the most unfavorable working condition to obtain the single-machine borne tonnage, then determines the safe working radius required under the most unfavorable working condition, and then checks the truck crane performance table by using the single-machine borne tonnage and the safe working radius to obtain whether the single-machine borne tonnage is within the range of the hoisting capacity, thereby determining the type and the tonnage of the crane. The construction method is suitable for the erection construction of all the beam bodies with small engineering quantity, and is particularly an optimal construction method for the construction environment with difficult river crossing erection.
Through patent retrieval and comparative analysis, related construction method patents are not searched, the prior art does not have the technical inspiration of the invention, and the invention has novelty and creativity.
Disclosure of Invention
The invention aims to provide a box girder erection construction method which has the characteristics of being used as landing legs for entering a field, being flexible, being high in construction speed and the like.
The technical solution of the invention is as follows: the construction of erecting the bridge body with small engineering quantity and crossing a construction environment with difficult river erection can be quickly completed by adopting a multi-machine linkage hoisting method, the construction process is simple and convenient to operate, the construction speed is high, the construction efficiency is improved, and the cost is reduced. In order to achieve the purpose, the invention is realized by the following technical scheme, which comprises the following construction steps:
firstly, transporting a box girder:
after all mechanical equipment is checked before beam transportation is prepared, 2 80T cranes are adopted to stop two sides of a box beam, firstly, trial hoisting is carried out, whether the steel wire rope and the equipment work normally is checked again during trial hoisting, after the box beam is checked to be qualified, the box beam is hoisted on an 80T tire beam transportation vehicle, after the steel wire rope is stably determined and then transported and reinforced, the steel wire rope can be removed, and the box beam enters a beam erecting area in a backward mode after the box beam is reinforced.
Step two, the box girder erection beam operation key points:
a. crane in position
The first stage is as follows: 200T Crane placing existing box culvert, 2# parking 2 cranes (200T and 130T)
b. Tie roof beam
Before the girder transporting vehicle transports the girder, the center line of the girder is found and a mark is made on the box girder, and when the girder is bundled, the fastener is ensured to be in the same line with the center line of the girder. When the girder is hoisted by feeding the girder, the girder transporting vehicle retreats to the 2# bridge abutment and is hoisted at the 1.5m position of the girder end by adopting a 200T crane, the backward movement of the girder transporting vehicle is synchronous with the girder feeding of the 200T crane, the stretched 200T crane is connected with the box girder at the box culvert, the steel wire rope is placed at the 1m position of the girder end for hoisting, and before the connection hoisting, in order to prevent the box girder from inclining, the 130T crane is adopted to hoist at the 1.5m position of the girder end and is matched with the 200T girder transporting crane to prevent the girder from inclining. After the 200T cranes are stably connected and hung, the 200T crane steel wire ropes are moved to the other end of the beam body, and the two cranes lift and hang the box beam to corresponding positions and hoist the box beam in sequence.
When the girder transporting vehicle is lifted on the bridge, the 200T crane and the 130T crane bundle the girder at the position of 1m of the girder end to lift.
c. Feeding beam and hanging beam in place
When the front beams of each span are fed and hung, in order to ensure the safety and reliability of the scheme, a 130T crane auxiliary beam body is additionally arranged to resist inclination, and a 200T heavy crane is adopted for hoisting a main crane.
After the bundle roof beam is accomplished, professional signal worker makes clear of the on-the-spot condition, and the working range is accessible, idle miscellaneous personnel, and the beam piece is binded firmly, orders two loop wheel machines to lift by crane simultaneously, guarantees the roof beam body and keeps certain distance with the structure when being close substructure structure, for preventing that the roof beam body from rocking collision bent cap and abutment, all adopt the billet screens near the roof beam body beam-ends structure, and when the beam piece was hung to a little higher than bridge bed stone height, two cars fell the beam piece sideslip to left line limit bed stone simultaneously.
The whole hoisting process, crane operators, field protection personnel and the like strictly obey the command of a signal worker, are not in emergency, and cannot interfere with the operation process of the crane operators. If an emergency occurs, a warning signal is sent out in time, and the hoisting is stopped.
d. Beam body fixation
When the beam falls on the plate type rubber support, because the beam surface is provided with a cross slope, the centroid position of the boundary beam is difficult to find, the gravity center is easy to deviate from the vertical direction, the installation in place is difficult, after the steel wire rope falls, the stress of the steel wire rope can be released after the embedded steel bar of the beam body is locally welded firmly because the steel wire rope keeps a tightened stress state, and the welding needs to be strengthened aiming at the outer beam.
And step three, hoisting the second, third and fourth stage box girders according to the control key points. And a second stage: the 200T crane is placed on an existing box culvert, and the other 200T crane is placed on the 2# left butt strap; and a third stage: the 200T crane is placed on an existing box culvert, and the other 200T crane is placed on the No. 2 right butt strap; a fourth stage: 2 200T cranes are respectively placed on the existing box culvert and the 2# right-width butt strap, and the other 130T crane is placed on the 0# butt strap.
And step four, pouring the wet joint section of the existing box girder which is hoisted completely, wherein the crane is not used in the stage, hoisting of the upper beam surface of the crane and the girder transporting vehicle in the subsequent stage is facilitated, and the maintenance strength must reach the design strength before the next stage of construction.
And fifthly, hoisting the upper beam surface of the crane and the beam transporting vehicle to finish hoisting in the sixth and seventh stages. The sixth stage: the 200T crane is placed on the 0# left-width butt strap, the 130T crane is placed on the 1# -2# box girder which is already wet-jointed → the seventh stage: 200T cranes are placed on the left butt strap of the 0# platform, and 130T cranes are placed on the wet-jointed 1# -2# span left beam bodies.
And sixthly, pouring the remaining wet joints of the box girder which is hoisted completely. The box girder is followed earlier and is carried out full weld to beam-ends diaphragm roof beam owner muscle to and the whole welding acceptance of beam body flange board reserved reinforcing bar is qualified, can carry out the template installation and concrete placement construction. Before concrete is poured, sundries in the formwork are cleaned, the conditions of a release agent and the like are checked, the concrete is vibrated compactly, and the beauty and the inside are ensured.
Further, the mechanical equipment type selection under each working condition is carried out by hoisting, and the considered factors are as follows: (1) the crane allows the maximum working radius; (2) the bearing capacity of the foundation at the stopping position of the crane; (3) the mechanical checking calculation of the steel wire rope; (4) the crane itself allows for relevant hoisting performance; (5) hoisting the load; (6) hoisting the total span; and (5) and (6) are combined to obtain the models of the hoisting mechanical equipment under various working conditions.
Further, the steel wire rope (3) is hoisted by a steel wire rope of 6 multiplied by 37+ 1-phi 52, and the hoisting load (5) is 8 in consideration of the dead weight of the box girder, the weight of the sling and the hoisting safety coefficient.
Furthermore, in the first box girder transportation step, the girder transportation vehicle is stopped on the girder transportation channel, and the bearing capacity of the base can meet the requirement of heavy-load operation of the girder transportation trolley and the crane, so that uneven settlement cannot be caused. When the crane is used for lifting the beam, the crane is hung in a trial mode to check the safety of the crane like a beam lifting machine, tests are carried out before and after the beam is lifted, and beam erecting work is carried out after no abnormality exists.
The box girder is transported by a girder transporting vehicle, and the road condition, the tire pressure, the braking system, the lubricating system and the overall safety are checked before transporting the girder. The drivers and the passengers need to be trained and have operation certificates, and the transportation process is instructed by special persons, and the special persons have special brake emergency schemes for checking safety.
And after the box girder to be installed is transported to a crane hoisting area from a prefabricating yard by using a girder transporting vehicle, the box girder is hoisted and installed by using a truck crane in sequence. And after the beam erecting work is finished, the beam transporting vehicle returns to the beam transporting vehicle.
Furthermore, when the beam is bundled in the second step, the steel wire rope and the concrete contact surface are padded with a rubber pad or a steel protection tile to prevent the lifting rope from being seriously abraded, and the edge angle of the beam bottom is padded with a protection iron to prevent the edge angle of the box beam from being damaged. When the box girder is transported, places contacting sharp hard objects such as iron and the like must be padded with 5cm wood boards or rubber boards to prevent the girder body from being damaged, when the box girder is close to a back wall (stop block), the box girder is moved to adopt a inching mode, and the rubber boards and the like are padded between the box girder and the back wall to prevent collision and damage.
Furthermore, the girder transporting and reinforcing assembly comprises a girder transporting flat car, adjustable bolts, wood wedge pins and sleepers, and the box girders horizontally placed on the girder transporting flat car are stably transported through the adjustable bolts and the wood wedge pins on the two sides of the girder body.
Furthermore, the sleepers need to be laid flatly, and the beam bodies are isolated from a beam transporting flat car, so that the beam bodies are prevented from colliding and the appearance is prevented from being damaged.
The invention has the beneficial effects that:
the construction method has the advantages that the construction method is used for erecting and constructing the box girder of the urban bridge with small engineering quantity, difficult construction and large safety risk of a river-crossing crane, and the prefabricated box girder multi-machine combined hoisting river-crossing erected box girder hoisting method realizes economy to the maximum extent and fully plays the roles of quick, mechanized and standardized construction in and out of a field; the construction method simplifies the construction process, shortens the construction period of erecting the girder, controls the erection period of the box girder within 7 days, totally saves the total construction period by 2 days, has obvious quick construction technical effect, meets the requirement of the construction period of the whole bridge and obtains good social benefit.
Drawings
Fig. 1 is a front view of the beam-transporting flat car beam-fixing of the invention.
Fig. 2 is a scene diagram of the girder transporting vehicle on the box girder.
Fig. 3 is a box girder transportation scene diagram of the present invention.
Fig. 4 is a view of the crane in place and beam bundling scene of the present invention.
Fig. 5 is a scene diagram of the feeding and connecting beams of the box girder.
Fig. 6 is a scene diagram of the box girder hoisting in place of the invention.
Detailed Description
The invention is further illustrated by the following examples.
A construction method for erecting a prefabricated box girder across a river by multi-machine combined hoisting comprises the following construction steps:
firstly, transporting a box girder:
after all mechanical equipment is checked before beam transportation is prepared, 2 80T cranes are adopted to stop two sides of a box beam, firstly, trial hoisting is carried out, whether the steel wire rope and the equipment work normally is checked again during trial hoisting, after the box beam is checked to be qualified, the box beam is hoisted on an 80T tire beam transportation vehicle, after the steel wire rope is stably determined and then transported and reinforced, the steel wire rope can be removed, and the box beam enters a beam erecting area in a backward mode after the box beam is reinforced.
Step two, the box girder erection beam operation key points:
a. crane in position
The first stage is as follows: 200T Crane placing existing box culvert, 2# parking 2 cranes (200T and 130T)
b. Tie roof beam
Before the girder transporting vehicle transports the girder, the center line of the girder is found and a mark is made on the box girder, and when the girder is bundled, the fastener is ensured to be in the same line with the center line of the girder. When the girder is hoisted by feeding the girder, the girder transporting vehicle retreats to the 2# bridge abutment and is hoisted at the 1.5m position of the girder end by adopting a 200T crane, the backward movement of the girder transporting vehicle is synchronous with the girder feeding of the 200T crane, the stretched 200T crane is connected with the box girder at the box culvert, the steel wire rope is placed at the 1m position of the girder end for hoisting, and before the connection hoisting, in order to prevent the box girder from inclining, the 130T crane is adopted to hoist at the 1.5m position of the girder end and is matched with the 200T girder transporting crane to prevent the girder from inclining. After the 200T cranes are stably connected and hung, the 200T crane steel wire ropes are moved to the other end of the beam body, and the two cranes lift and hang the box beam to corresponding positions and hoist the box beam in sequence.
When the girder transporting vehicle is lifted on the bridge, the 200T crane and the 130T crane bundle the girder at the position of 1m of the girder end to lift.
c. Feeding beam and hanging beam in place
When the front beams of each span are fed and hung, in order to ensure the safety and reliability of the scheme, a 130T crane auxiliary beam body is additionally arranged to resist inclination, and a 200T heavy crane is adopted for hoisting a main crane.
After the bundle roof beam is accomplished, professional signal worker makes clear of the on-the-spot condition, and the working range is accessible, idle miscellaneous personnel, and the beam piece is binded firmly, orders two loop wheel machines to lift by crane simultaneously, guarantees the roof beam body and keeps certain distance with the structure when being close substructure structure, for preventing that the roof beam body from rocking collision bent cap and abutment, all adopt the billet screens near the roof beam body beam-ends structure, and when the beam piece was hung to a little higher than bridge bed stone height, two cars fell the beam piece sideslip to left line limit bed stone simultaneously.
The whole hoisting process, crane operators, field protection personnel and the like strictly obey the command of a signal worker, are not in emergency, and cannot interfere with the operation process of the crane operators. If an emergency occurs, a warning signal is sent out in time, and the hoisting is stopped.
d. Beam body fixation
When the beam falls on the plate type rubber support, because the beam surface is provided with a cross slope, the centroid position of the boundary beam is difficult to find, the gravity center is easy to deviate from the vertical direction, the installation in place is difficult, after the steel wire rope falls, the stress of the steel wire rope can be released after the embedded steel bar of the beam body is locally welded firmly because the steel wire rope keeps a tightened stress state, and the welding needs to be strengthened aiming at the outer beam.
And step three, hoisting the second, third and fourth stage box girders according to the control key points.
And a second stage: the 200T crane is placed on an existing box culvert, and the other 200T crane is placed on the 2# left butt strap; and a third stage: the 200T crane is placed on an existing box culvert, and the other 200T crane is placed on the No. 2 right butt strap; a fourth stage: 2 200T cranes are respectively placed on the existing box culvert and the 2# right-width butt strap, and the other 130T crane is placed on the 0# butt strap.
And step four, pouring the wet joint section of the existing box girder which is hoisted completely, wherein the crane is not used in the stage, hoisting of the upper beam surface of the crane and the girder transporting vehicle in the subsequent stage is facilitated, and the maintenance strength must reach the design strength before the next stage of construction.
And fifthly, hoisting the upper beam surface of the crane and the beam transporting vehicle to finish the hoisting in the sixth and seventh stages. The sixth stage: the 200T crane is placed on the 0# left-width butt strap, the 130T crane is placed on the 1# -2# box girder which is already wet-jointed → the seventh stage: 200T cranes are placed on the left butt strap of the 0# platform, and 130T cranes are placed on the wet-jointed 1# -2# span left beam bodies.
And sixthly, pouring the wet joint sections of the left lifted box girders, wherein the maintenance strength must reach the design strength before the construction of the lower bridge deck slab.
Preferably, the mechanical equipment under each working condition is selected, and the factors considered include: (1) the crane allows the maximum working radius; (2) the bearing capacity of the foundation at the stopping position of the crane; (3) the mechanical checking calculation of the steel wire rope; (4) the crane itself allows for relevant hoisting performance; (5) hoisting the load; (6) hoisting the total span; and (5) and (6) are combined to obtain the models of the hoisting mechanical equipment under various working conditions.
Preferably, the steel wire rope (3) is hoisted by a steel wire rope of 6 multiplied by 37+ 1-phi 52, and the hoisting load (5) is 8 in consideration of the dead weight of the box girder, the weight of the sling and the hoisting safety coefficient.
Preferably, in the second box girder transporting step, the girder transporting vehicle is stopped on the girder transporting channel, and the bearing capacity of the base can meet the requirement of heavy-load operation of the girder transporting trolley and the crane, so that uneven settlement cannot be caused. When the crane is used for lifting the beam, the crane is hung in a trial mode to check the safety of the crane like a beam lifting machine, tests are carried out before and after the beam is lifted, and beam erecting work is carried out after no abnormality exists.
The box girder is transported by a girder transporting vehicle, and the road condition, the tire pressure, the braking system, the lubricating system and the overall safety are checked before transporting the girder. The drivers and the passengers need to be trained and have operation certificates, and the transportation process is instructed by special persons, and the special persons have special brake emergency schemes for checking safety.
And after the box girder to be installed is transported to a crane hoisting area from a prefabricating yard by using a girder transporting vehicle, the box girder is hoisted and installed by using a truck crane in sequence. And after the beam erecting work is finished, the beam transporting vehicle returns to the beam transporting vehicle.
Preferably, when the beam is bundled in the second step, the steel wire rope and the concrete contact surface are padded with rubber pads or steel protecting tiles to prevent the lifting rope from being seriously abraded, and the edge angles of the beam bottom are padded with iron protectors to prevent the edge angles of the box beam from being damaged. When the box girder is transported, places contacting sharp hard objects such as iron and the like must be padded with 5cm wood boards or rubber boards to prevent the girder body from being damaged, when the box girder is close to a back wall (stop block), the box girder is moved to adopt a inching mode, and the rubber boards and the like are padded between the box girder and the back wall to prevent collision and damage.
Preferably, the girder transporting and reinforcing assembly comprises a girder transporting flat car, adjustable bolts, wood wedge pins and sleepers, and the box girders horizontally placed on the girder transporting flat car are stably transported through the adjustable bolts and the wood wedge pins on the two sides of the girder body.
Preferably, the sleepers need to be laid flatly, and the beam bodies are isolated from a beam transporting flat car, so that the beam bodies are prevented from colliding and the appearance is prevented from being damaged.
In conclusion, compared with the construction of the frame beam of the bridge erecting machine adopting the double-guide-rail method, the invention has the advantages that: the method has the advantages of relatively low entrance cost, instant use of the entrance support legs, flexibility, high construction speed and suitability for projects with small engineering quantity; the invention can effectively solve the problems of long assembling and acceptance time, high entrance cost, unsuitability for beam erecting engineering with small engineering quantity and the like of a single-double guide beam method.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein, and the above description of the embodiments is only used to help understand the method and its core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A construction method for erecting a prefabricated box girder across a river by multi-machine combined hoisting is characterized by comprising the following construction steps:
firstly, transporting a box girder:
after all mechanical equipment is checked before beam transportation is prepared, the two sides of a 2-crane first box stopping beam are firstly tried to be hung, whether the steel wire rope and the equipment work normally is checked again during the trial hanging, after the check is qualified, the box beam is lifted on a beam transportation vehicle, the steel wire rope is determined to be stable, and after the transportation beam reinforcing assembly is adopted for transportation and reinforcement, the steel wire rope can be removed, and the box beam enters a beam erecting area in a backward mode after the box beam reinforcement is completed;
step two, erecting a box girder:
a. positioning a crane:
the first stage is as follows: the second crane is placed on an existing box culvert on site, and 2 cranes of the second crane and the third crane are parked on the 2# bridge abutment;
b. bundling the beam:
before the girder transporting vehicle transports the girder, the center line of the girder is found and a mark is made on the box girder, and when the girder is bundled, the fastener is ensured to be in the same line with the center line of the girder. When the beam is hoisted by feeding the beam, the beam transport vehicle retreats to the 2# bridge abutment and is hoisted at the 1.5m position of the beam end by adopting a second crane, the backward movement of the beam transport vehicle is synchronous with the beam feeding of the second crane, the stretched second crane is connected with a box girder at a box culvert, a steel wire rope is placed at the 1m position of the beam end for hoisting, before the connection hoisting, in order to prevent the box girder from inclining, the third crane is adopted to hoist at the 1.5m position of the beam end and is matched with the second crane to prevent the inclination of the beam body; after the second crane is stably connected and hoisted, the steel wire rope of the second crane is moved to the other end of the beam body, and the two cranes lift and hoist the box beam to corresponding positions and hoist the box beam in sequence;
when the girder transporting vehicle is used for loading and lifting, the second crane and the third crane are used for bundling and lifting at the position of 1m of the girder end;
c. the beam feeding and the hanging beam are in place:
when the front beams of each span are fed and hung, in order to ensure the safety and reliability of the scheme, a third crane is additionally arranged to resist inclination, and a second crane is adopted as a main crane for hoisting;
after the beam bundling is finished, a professional signaler determines the field condition, no obstacles and idle personnel exist in the operation range, the beam pieces are firmly bundled, two cranes are instructed to hoist simultaneously, a certain distance is kept between the beam body and the structure when the beam body approaches the lower-part structure, in order to prevent the beam body from shaking and colliding a cover beam and a bridge abutment, the positions near the beam-end structure of the beam body are clamped by wood blocks, and when the beam pieces are hoisted to a height slightly higher than that of a bridge cushion, the two cranes transversely move the beam pieces to the left-line side beam cushion;
d. fixing the beam body:
when a beam falls on the plate type rubber support, because a cross slope is arranged on the beam surface, particularly the centroid position of the side beam is difficult to find, the gravity center of the side beam is easy to deviate from the vertical direction, the installation in place is difficult, after the steel wire rope falls, the steel wire rope is kept in a tensioned stress state, after the embedded steel bar of the beam body is locally welded firmly, the stress of the steel wire rope can be released, and the outer beam needs to be welded in a reinforcing way;
step three, hoisting the box girder in the second, third and fourth stages:
hoisting the box girder at the second stage: placing one second crane on the existing box culvert, and placing the other second crane on the 2# left butt strap;
hoisting the box girder in the third stage: placing one second crane on the existing box culvert, and placing the other second crane on the 2# right butt strap;
hoisting the box girder at the fourth stage: 2, placing a second crane on the existing box culvert and the 2# right butt strap respectively, and placing a first crane on the 0# butt strap;
step four, pouring the wet joint section of the box girder which is hoisted completely, wherein a crane is not used in the stage, so that hoisting of the upper beam surface of a crane and a girder transporting vehicle in the subsequent stage is facilitated; the curing strength must reach the design strength before the next stage of construction.
Fifthly, hoisting the upper beam surface of the crane and the beam transporting vehicle to finish the hoisting in the sixth and seventh stages;
hoisting in the sixth stage: the second crane is placed on a 0# left-width lapping plate, and the first crane is placed on a 1# to 2# box girder which is in a cross-over wet connection;
hoisting in the seventh stage: the second crane is placed on a 0# platform left side lapping plate, and the first crane is placed on a 1# to 2# cross left side beam body which is wet-jointed;
and sixthly, pouring the wet joint sections of the left lifted box girders, and entering the lower bridge deck for construction after the maintenance strength reaches the design strength.
2. The construction method for erecting the precast box girder across the river by multi-machine combined hoisting as recited in claim 1, wherein the first crane is an 80T crane, the second crane is a 200T crane, and the third crane is a 130T crane.
3. The construction method for erecting the precast box girder across the river by multi-machine combined hoisting of the claim 1, wherein the girder transporting and reinforcing assembly comprises a girder transporting flat car, adjustable bolts, wood wedge locking and sleepers, and the box girder which is horizontally placed on the girder transporting flat car is transported by the adjustable bolts and the wood wedge locking at the two sides of the girder body.
4. The multi-machine linked-hoisting river-crossing erection construction method for the precast box girders as claimed in claim 1, wherein the sleepers need to be laid flatly, and the girder bodies are isolated from a girder transporting flat car to prevent the girder bodies from colliding and being damaged in appearance.
5. The prefabricated box girder multi-machine combined hoisting river-crossing erection construction method according to claim 1, wherein the hoisting mechanical equipment under each working condition is selected based on: (1) the crane allows the maximum working radius; (2) the bearing capacity of the foundation at the stopping position of the crane; (3) the steel wire rope mechanics checking calculation and model selection; (4) the crane itself allows for relevant hoisting performance; (5) hoisting the load; (6) and hoisting the total span. The models of the hoisting mechanical equipment under various working conditions are obtained by combining the conditions (1) and (4) and the conditions (5) and (6).
6. The construction method for erecting the precast box girder across the river by multi-machine combined hoisting as claimed in claim 1, wherein in the step of transporting the box girder, the girder transporting vehicle is stopped on the girder transporting channel, and the base bearing capacity can meet the requirement of heavy-load operation of the girder transporting trolley and the crane without causing uneven settlement. When the crane lifts the beam, the crane is tried to be hung to check the safety of the crane, the front and the back of the beam are tested, and the beam erecting work is carried out after no abnormality occurs.
7. The construction method for erecting the prefabricated box girder across the river by multi-machine combined hoisting according to the claim 1, wherein in the step one box girder, after the box girder to be installed is transported to a crane hoisting area from a prefabrication yard by a girder transporting vehicle, the box girder is hoisted and installed by a truck in sequence. And after the beam erecting work is finished, the beam transporting vehicle returns to the beam transporting vehicle.
8. The construction method for erecting the precast box girder across the river by multi-machine combined hoisting according to claim 1, wherein in the second step, when the girder is bundled, a rubber pad or a steel shoe is adopted for a contact surface between the steel wire rope and the concrete to prevent the lifting rope from being seriously worn, and a steel back iron is adopted for a ridge angle at the bottom of the girder to prevent the ridge angle of the box girder from being damaged.
9. The construction method for erecting the precast box girder across the river by multi-machine linked lifting as claimed in claim 1, wherein in the second step, a wood plate or a rubber plate must be padded at a place where the box girder contacts with a sharp hard object during transportation to prevent damage to the girder body, the box girder is moved in a jogging manner when approaching a back wall, and the rubber plate or the wood plate is padded between the two to prevent collision and damage.
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| CN113152306A (en) * | 2021-03-17 | 2021-07-23 | 中铁八局集团有限公司 | Small-radius large-gradient prefabricated T beam frame construction method |
| CN113481858A (en) * | 2021-07-12 | 2021-10-08 | 山东省高速路桥养护有限公司 | Bridge box girder installation method |
| CN113622310A (en) * | 2021-07-30 | 2021-11-09 | 中铁十九局集团第五工程有限公司 | Method for transporting beam and frame beam suitable for small-radius curve section |
| CN114592439A (en) * | 2022-04-12 | 2022-06-07 | 通号建设集团有限公司 | Construction method of aerial relay frame beam |
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