CN114164766A - Method for erecting front supporting leg of bridge erecting machine - Google Patents
Method for erecting front supporting leg of bridge erecting machine Download PDFInfo
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- CN114164766A CN114164766A CN202111600194.5A CN202111600194A CN114164766A CN 114164766 A CN114164766 A CN 114164766A CN 202111600194 A CN202111600194 A CN 202111600194A CN 114164766 A CN114164766 A CN 114164766A
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- 230000003028 elevating effect Effects 0.000 claims description 9
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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
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Abstract
The invention relates to the technical field of capital construction engineering, in particular to a method for erecting a front supporting leg of a bridge girder erection machine, which comprises the following steps: s1, preparing a main beam to move forwards; s2, moving the main beam; s3, primary positioning of the front supporting legs; s4, adjusting the front and back and left and right positions of the front supporting leg; s5, erecting a front supporting leg; s6, moving the T-shaped beam; s7, positioning and falling installation of the T-shaped beam; the erection of the front support leg of the bridge girder erection machine and the erection of the T-shaped beam are realized through the camera system and the laser ranging system, no people works high above the ground, the labor intensity is greatly reduced, the occurrence of personal safety accidents is avoided, and potential safety hazards are eliminated.
Description
Technical Field
The invention relates to the technical field of capital construction engineering, in particular to a method for erecting a front supporting leg of a bridge girder erection machine.
Background
At present, the front support leg of the bridge girder erection machine is mostly erected in the form of a skid, a steel buttress or a plurality of groups of conventional screw rods for heightening.
The form of the bolster and the steel buttress bolster height needs manual work to stand on a pier capping beam to move the bolster and the bolster height; the labor intensity of workers is high, and the potential safety hazard is large.
The conventional unpowered multi-screw-rod form is adopted to form the buttress-type bed height, so that the structural weight is too heavy, the capability of the front support leg of the bridge girder erection machine for passing through the pier span is reduced, and the performance parameters of the bridge girder erection machine are reduced; if a driving device is added on the conventional lead screw, the weight of the lead screw is heavier, and the performance parameters of the bridge girder erection machine are further reduced.
In order to reduce the number of high-altitude operation constructors and reduce the labor intensity of the constructors, the application provides the erection method of the front support leg of the bridge girder erection machine, and the positioning of the front support leg and the main beam can realize unmanned operation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for erecting the front supporting leg of the bridge erecting machine, which has low labor intensity and high safety.
The invention provides a method for erecting a front supporting leg of a bridge girder erection machine, which comprises the following steps:
s1, preparing a main beam in a forward moving mode:
adjusting the front supporting leg oil cylinder to be recovered, enabling the bottom end of the front supporting leg to be higher than the height of the cushion stone on the cover beam, and then recovering the rear supporting leg;
s2, moving the main beam:
the main beam drives the front support leg to move forwards until the front support leg moves to the position above a bent cap of the next construction pier;
s3, primary positioning of the front supporting leg:
preliminarily positioning the front leg above a preassigned mounting position on the bent cap by using a picture obtained by a camera system mounted on the front leg;
s4, adjusting the front and rear and left and right positions of the front supporting leg:
descending the front supporting leg oil cylinder until a distance measuring system on the bridge girder erection machine obtains distance data between the bottom of the front supporting leg and the cover beam, and respectively adjusting the front position, the rear position, the left position and the right position of the front supporting leg according to the obtained data;
s5, erecting a front supporting leg:
after the position of the front supporting leg is adjusted, the front supporting leg oil cylinder continues to descend, the front supporting leg falls on the cover beam, the levelness of the main beam is adjusted to meet the construction standard, and then a front supporting leg bolt is inserted into the cover beam;
s6, moving the T-shaped beam:
moving the T-shaped beam to a position to be installed through a hoisting trolley;
s7, positioning and falling installation of the T-shaped beam:
and controlling a steel wire rope of the hoisting trolley, lowering the T-shaped beam to a position 5-10cm away from the cushion on the cover beam, adjusting the position of the T-shaped beam in the front-back direction through a distance measuring system, then dropping the T-shaped beam, and repeating the steps to erect the next T-shaped beam.
A track beam is fixed below the front support oil cylinder, a support adjusting structure is arranged at the bottom of the track beam, and the support adjusting structure comprises
The bearing assembly can bear a large load and comprises a fixing part and a lifting part which is sleeved outside the fixing part and can move up and down along the fixing part, the fixing part is in threaded connection with the lifting part, and an accommodating cavity is arranged inside the fixing part;
the jacking oil cylinder is used for jacking under the condition of light load and is positioned in the accommodating cavity, the jacking oil cylinder comprises a cylinder barrel and a piston rod, and the top end of the piston rod is fixed at the bottom of the track beam;
and the driving device comprises a motor and a transmission assembly and is used for driving the lifting part to rotate so that the lifting part can ascend or descend along the fixed part.
In some embodiments of the present application, the fixing portion is a hollow cylindrical structure with an upper opening, a fixing plate is disposed at a bottom end of the fixing portion, and the lifting portion is a cylindrical structure with an upper opening and a lower opening, and can move up and down along the fixing portion when rotating; the bottom of the cylinder barrel of the jacking oil cylinder is fixedly arranged on the fixing plate.
In some embodiments of the present application, in step S1, when the front leg cylinder is retracted, the method specifically includes the following steps:
s11, after the front support oil cylinder returns oil and contracts to the position that a fixing plate of the support adjusting structure is higher than the cover beam by more than 5cm, the front support oil cylinder stops returning oil;
s12, feeding oil into the jacking oil cylinder, extending a piston rod until the fixed plate is in contact with the cover beam so that the fixed part is fixed relative to the cover beam, moving the lifting part downwards along with the fixed plate to be separated from the track beam, and stopping feeding oil into the jacking oil cylinder;
s13, opening the motor, rotating the lifting part, adjusting the height of the lifting part to be matched with the gradient of the next cover beam to enable the track beam to have the gradient meeting the construction requirement, and then closing the motor;
and S14, continuously returning oil to the front supporting leg oil cylinder until the fixed plate is higher than the height of the cushion stone on the cover beam, and then retracting the rear supporting leg.
According to the method for erecting the front supporting leg of the bridge girder erection machine, the front supporting leg of the bridge girder erection machine and the T-shaped beam are erected through the camera system and the laser ranging system, no person works high above the ground, the labor intensity is greatly reduced, the occurrence of personnel safety accidents is avoided, and potential safety hazards are eliminated.
In some embodiments of the present application, the camera system of the front leg includes a first camera device disposed below the main beam, a second camera device mounted above the rail beam, and the first camera device and the second camera device cooperate to position the front leg above a position on the cover beam for securing the front leg.
In some embodiments of the present application, the ranging system includes a first laser range finder disposed in front of the front leg near the bottom, the first laser range finder being configured to measure a distance between the front leg and the cover bar in a front-rear direction, a second laser range finder disposed on a side of the front leg near the bottom, the second laser range finder being configured to measure a distance between the front leg and the cover bar in a left-right direction;
the front-back direction is the advancing direction of the main beam, and the front-back relative positions of the front supporting leg and the cover beam can be adjusted according to the data of the first direction measured by the first laser range finder, so that the front-back direction of the main beam is positioned;
the left and right directions are directions perpendicular to the main beam, and the relative positions of the front supporting legs and the cover beam in the left and right directions can be adjusted according to data of a second direction measured by the second laser range finder, so that the positioning of the front supporting legs in the left and right directions is realized.
In some embodiments of the present application, in step S5, the level of the main beam is adjusted by the front leg cylinder.
In some embodiments of the present application, the laser ranging system further includes a third laser range finder disposed above the cap beam, and in step S7, it is determined whether the T-shaped beam reaches a predetermined position in the front-rear direction through the third laser range finder.
In some embodiments of the present application, the motor of the driving device is fixed on the fixing rod, and the fixing rod is disposed at an edge of the fixing plate;
the transmission assembly comprises a driving gear fixed on an output shaft of the motor and a lifting gear meshed with the driving gear, and the lifting gear is sleeved below the lifting part.
In some embodiments of the present application, an upper limiting plate is disposed on the top of the driving gear, and a lower limiting plate is symmetrically disposed on the bottom of the driving gear, and a plane where the upper limiting plate and the lower limiting plate are located is parallel to a plane where the driving gear is located; the rotation axis of lifting gear with go up the spacing board or the shortest distance between the spacing board is less than or equal to the radius of the root circle of lifting gear, the lift portion reciprocates along the fixed part, and lifting gear also reciprocates thereupon, goes up spacing board or receives the effort of lifting gear's vertical direction down, drives the motor and reciprocates, need not to provide extra power for the motor goes up and down.
Based on the technical scheme, the method for erecting the front supporting leg of the bridge girder erection machine realizes the erection of the front supporting leg of the bridge girder erection machine and the erection of the T-shaped beam through the camera system and the laser distance measuring system, does not have high-altitude operation, greatly reduces the labor intensity, avoids the occurrence of personnel safety accidents, and eliminates potential safety hazards.
The levelness of the main beam is adjusted through the supporting and adjusting structure, the fixing part and the lifting part form a screw nut pair, the screw nut pair is combined with jacking of the oil cylinder, the jacking oil cylinder jacks under light load, after the lifting part rises to the jacking height, the jacking oil cylinder returns oil to contract, the lifting part bears the load, the load can be continuously increased, and the lifting device is suitable for the working condition of large load;
the jacking oil cylinder is arranged in the lifting part, so that the equipment space is fully utilized, the weight of the lifting motor is light, and the overall weight and the cost of the device are reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a left side view schematic structural diagram of a front leg of a bridge girder erection machine according to the present invention;
FIG. 2 is a longitudinal cross-sectional view of a support adjustment structure of the present invention;
FIG. 3 is a front view of the lift portion of the support adjustment structure of the present invention as it is raised;
FIG. 4 is a schematic diagram of the front support leg cylinder before contraction in the method for erecting the front support leg of the bridge girder erection machine according to the present invention;
FIG. 5 is an enlarged view of A-A of FIG. 4;
FIG. 6 is a schematic diagram of the front leg cylinder retracting and lifting in the method for erecting the front leg of the bridge girder erection machine according to the present invention;
FIG. 7 is a schematic view showing the main girder moving process in the method for erecting the front supporting legs of the bridge girder erection machine according to the present invention;
FIG. 8 is a schematic diagram of the T-beam moving process of the erecting method of the front support leg of the bridge erecting machine according to the invention;
FIG. 9 is an enlarged view of portion B of FIG. 8;
FIG. 10 is another schematic view illustrating the T-beam movement in the method for erecting the front leg of the bridge girder erection machine according to the present invention;
FIG. 11 is a schematic view illustrating a T-beam being moved to an installation position in accordance with the method for erecting a front leg of a bridge girder erection machine according to the present invention;
FIG. 12 is a schematic view showing the lowering of a T-beam in the method for erecting a front leg of a bridge girder erection machine according to the present invention;
fig. 13 is a schematic structural diagram of the oil cylinder of the support adjusting structure according to the present invention when oil is introduced.
In the figure, the position of the upper end of the main shaft,
10. a main beam; 11. hoisting a trolley; 20. a front leg; 21. a front support leg oil cylinder; 22. a camera system; 221. a first image pickup device; 222. a second image pickup device; 23. a ranging system; 231. a first laser range finder; 231. a second laser rangefinder; 233. a third laser range finder; 24. a track beam; 25. supporting the adjusting structure; 251. a fixed part; 252. a lifting part; 253. an accommodating cavity; 254. a fixing plate; 255. a first threaded portion; 256. a lifting gear; 257. a reinforcing ring; 26. a jacking oil cylinder; 261. a cylinder barrel; 262. a piston rod; 30. a capping beam; 31. a cushion stone; 32. a circumferential filter pipe; 40. a rear leg; 50. a T-shaped beam; 51. and (4) carrying out gun carrier.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in FIG. 1, in the method for erecting the front support leg of the bridge erecting machine, the front support leg is a double-support-leg structure, a front support leg cylinder 21 is arranged below each support leg, a track beam 24 is fixed below each front support leg cylinder 21, and support adjusting structures 25 are uniformly arranged at the bottom of each track beam 24.
As shown in fig. 2-3, the support adjustment structure 25 includes:
the load bearing assembly can bear a large load and comprises a fixing part 251 and an elevating part 252 which is sleeved outside the fixing part 251 and can move up and down along the fixing part 251, the fixing part 251 and the elevating part 252 are in threaded connection, a first threaded part 255 is arranged on the outer wall of the fixing part 251, a second threaded part (not shown in the figure) matched with the first threaded part 255 is arranged on the inner wall of the elevating part 252, and the elevating part 252 can move up or down along the fixing part 251 when rotating; the fixing portion 251 has an accommodating cavity 253 therein;
the jacking oil cylinder 26 is used for jacking under a light load condition and is positioned in the accommodating cavity 253, the jacking oil cylinder 26 comprises a cylinder barrel 261 and a piston rod 262, and the top end of the piston rod 262 is fixed at the bottom of the track beam 24;
the driving device 27 includes a motor 271 and a transmission assembly, and is used for driving the lifting unit 252 to rotate, so that the lifting unit 252 can be lifted up or down along the fixing unit 251.
As shown in fig. 2, the fixing portion 251 has a hollow cylindrical structure with an upper opening, a fixing plate 254 is provided at the bottom end thereof, and the elevating portion 252 has a cylindrical structure with an upper opening and a lower opening, and can move up and down along the fixing portion 251 when the elevating portion 252 rotates; the bottom of the cylinder 262 of the jacking cylinder 26 is fixedly arranged on the fixed plate 254.
The motor 271 of the driving device 27 is fixed on the fixing rod 28, and the fixing rod 28 is arranged at the edge of the fixing plate 254; the transmission assembly includes a driving gear 272 fixed to an output shaft of the motor 271, and a lifting gear 256 engaged with the driving gear 272, and the lifting gear 256 is externally fitted under the lifting unit 252.
Wherein, the top of the driving gear 272 is provided with an upper limiting plate 273, the bottom is symmetrically provided with a lower limiting plate 274, and the plane where the upper limiting plate 273 and the lower limiting plate 274 are located is parallel to the plane where the driving gear 272 is located; the distance between the upper limiting plate 273 and the lower limiting plate 274 is matched with the thickness of the lifting gear 256, the shortest distance between the rotating shaft of the lifting gear 256 and the upper limiting plate 273 or the lower limiting plate 274 is smaller than or equal to the radius of the root circle of the lifting gear 256, the lifting part 252 moves up and down along the fixed part, the lifting gear 256 also moves up and down along with the rotating shaft, the upper limiting plate 273 or the lower limiting plate 274 is acted by the vertical acting force of the lifting gear 256 to drive the motor 271 to move up and down, and extra power does not need to be provided for the lifting of the motor 271. When the lifting gear 256 is lifted, the upper limiting plate 273 is pulled upwards by the lifting gear 256, and the driving gear 272 and the motor 271 are lifted therewith; when the elevating gear 256 descends, the lower limit plate 274 is pressed downward by the elevating gear 256, and the driving gear 272 and the motor 271 descend accordingly.
As shown in fig. 3, a slide rail 281 is arranged on the fixing rod 28 along the length direction, and the moving track of the motor 271 is defined, so that the motor 271 moves up and down along the slide rail 281, and along with the movement of the lifting portion 252, the motor 271 moves along the slide rail 281 synchronously, which ensures the transmission continuity and safety of the motor 281 to the lifting gear 256, and the lifting portion 252 continuously and smoothly runs to the lifting height.
The top of lift portion 252 is provided with the beaded finish 257, and beaded finish 257 can prevent to lift portion 252 yielding deformation when the bearing, has still increased the area of contact of lift portion 2522 with the track roof beam simultaneously, has further improved the stability and the security of lift portion 2522.
The method for erecting the front supporting leg of the bridge erecting machine comprises the following steps of:
s1, preparing the main beam 10 to move forwards:
adjusting the front supporting leg oil cylinder 21 to be retracted so that the bottom end of the front supporting leg 20 is higher than the height of the cushion stone 31 on the cover beam 30, and then retracting the rear supporting leg 40, as shown in fig. 4-6;
s2, moving the main beam 10:
the main beam 10 drives the front support leg 20 to move forwards until the front support leg 20 moves to the position above the capping beam 30 of the next construction pier, and as shown in fig. 7-9, the gun carriage 51 moves the next T-shaped beam 50 to the position below the main beam 10;
s3, initially positioning the front supporting leg 20:
preliminarily positioning the front leg 20 above a previously designated mounting position on the bent cap 30 using a picture obtained by the camera system 22 mounted on the front leg 20;
s4, adjusting the front-rear and left-right positions of the front leg 20:
descending the front supporting leg oil cylinder 21 until a distance measuring system 23 on the bridge girder erection machine obtains distance data between the bottom of the front supporting leg 20 and the cover beam 30, and respectively adjusting the front position, the rear position, the left position and the right position of the front supporting leg 20 according to the obtained data;
s5, erecting the front supporting leg 20:
after the position of the front supporting leg 20 is adjusted, the front supporting leg oil cylinder 21 is continuously descended, the front supporting leg 20 is dropped on the appointed installation position of the cover beam, the levelness of the main beam 10 is adjusted to meet the construction standard through the front supporting leg oil cylinder 21, and then the bolt of the front supporting leg 20 is inserted into the cover beam 30;
s6, moving the T-beam 50:
moving the T-beam 50 to the position to be installed by the lifting trolley 11, as shown in FIGS. 7-8;
s7, positioning and falling installation of the T-shaped beam 50:
controlling a steel wire rope of the hoisting trolley 11, lowering the T-shaped beam 50 to a position 315-10cm away from the cushion stone on the bent cap, adjusting the position of the T-shaped beam 50 in the front-back direction through a distance measuring system, and then dropping the T-shaped beam 50, as shown in figures 10-12; the above steps are repeated to erect the next T-shaped beam 50.
In order to enable the gradient of the track beam to meet the construction requirement when the front support leg moves to the next bent cap, the method specifically comprises the following steps when the front support leg oil cylinder 21 is retracted in step S1:
s11, after the front support leg oil cylinder 21 returns oil and contracts to the position that the fixed plate 254 of the support adjusting structure 25 is higher than the bent cap by more than 5cm, the front support leg oil cylinder 21 stops returning oil;
s12, oil is fed into the jacking oil cylinder 26, the piston rod 262 extends until the fixing plate 254 is in contact with the cover beam 30, so that the fixing part 251 is fixed relative to the cover beam 30, the lifting part 252 moves downwards along with the fixing part 251 and the fixing plate 254 to be separated from the track beam 24, the jacking oil cylinder 26 stops feeding the oil, and at the moment, the piston rod is jacked under light load;
s13, turning on the motor 271, rotating the lifting unit 252, adjusting the height of the lifting unit 252 to match the slope of the next capping beam 30, the track beam 24 having a slope meeting the construction requirement, turning off the motor 271, as shown in fig. 13;
then, the jacking oil cylinder 26 can be returned to the initial position, so that the reinforcing ring 257 at the top end of the lifting part 252 is in contact with the track beam 24 to bear load, and the piston rod 262 plays a role in assisting the lifting part in lifting, and when the erection of the front support legs is completed, the supporting and adjusting structure 25 plays a role in lifting with a large load;
the above-mentioned S12 and S13 may be performed before the front leg 20 is inserted into the bent cap and the T-beam is transferred.
And S14, continuously returning oil to the front supporting leg oil cylinder 21 until the fixing plate 254 is higher than the height of the cushion stone 31 on the cover beam 30, and then retracting the rear supporting leg 40.
The camera system 22 of the front leg 20 comprises a first camera 221 arranged below the main beam 10, and a second camera 222 mounted above the track beam 24, wherein the first camera 221 and the second camera 222 cooperate with each other to position the front leg 20 above a position of the cover beam 30 where the mounting is designated.
The distance measuring system 23 comprises a first laser distance meter 231 arranged in front of the front leg 20 and close to the bottom, and a second laser distance meter 232 arranged on the side of the front leg 20 and close to the bottom, wherein the first laser distance meter 231 is used for measuring the distance between the front leg 20 and the cover beam 30 in the front-back direction, and the second laser distance meter 232 is used for measuring the distance between the front leg 20 and the cover beam 30 in the left-right direction;
the front-back direction is the advancing direction of the main beam 10, and the front-back relative positions of the front support leg 20 and the bent cap 30 can be adjusted according to the data of the first direction measured by the first laser range finder 231, so that the main beam 10 can be positioned in the front-back direction;
the left-right direction is a direction perpendicular to the main beam 10, and the relative positions of the front support legs 20 and the bent cap 30 in the left-right direction can be adjusted according to the data of the second direction measured by the second laser range finder 232, so that the front support legs are positioned in the left-right direction.
As shown in fig. 9, the laser ranging system 23 further includes a third laser range finder 223 disposed above the capping beam 30, and it is determined whether the T-shaped beam 50 reaches a predetermined position in the front-rear direction by the third laser range finder 233 at step S7. At the tail end of the T-beam 50, a manual determination may be made to ensure the accuracy of the positioning.
Based on the technical scheme, the method for erecting the front support leg of the bridge girder erection machine realizes the erection of the front support leg 20 of the bridge girder erection machine and the erection of the T-shaped beam 50 through the camera system 22 and the laser ranging system 23, adopts unmanned aerial work, greatly reduces the labor intensity, avoids the occurrence of personnel safety accidents, and eliminates potential safety hazards.
The levelness of the track beam 24 is adjusted through the supporting adjusting structure 25, the fixing portion 251 and the lifting portion 252 form a screw nut pair, meanwhile, the screw nut pair is combined with the jacking of the oil cylinder, the jacking oil cylinder jacks lightly, after the lifting portion 252 rises to a jacking height, the jacking oil cylinder 26 returns oil to contract, the lifting portion 252 carries out large-load bearing, and the jacking oil cylinder 26 plays a role in assisting jacking and is suitable for the working condition of large load;
the jacking oil cylinder 26 is arranged in the fixing part 251, so that the equipment space is fully utilized, the weight of the motor is light, and the overall weight and the cost of the device are reduced.
Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A method for erecting a front supporting leg of a bridge girder erection machine is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a main beam in a forward moving mode:
adjusting the oil cylinder recovery of a front support leg of the bridge girder erection machine to enable the bottom end of the front support leg to be higher than the height of the cushion stone on the cover beam, and then recovering a rear support leg of the bridge girder erection machine;
s2, moving the main beam;
the main beam drives the front support leg to move forwards until the front support leg moves to the position above a bent cap of the next construction pier;
s3, primary positioning of the front supporting leg:
preliminarily positioning the front leg above a specified mounting position using a picture obtained by a camera system mounted on the front leg;
s4, adjusting the front and rear and left and right positions of the front supporting leg:
descending the front supporting leg oil cylinder until a distance measuring system on the bridge girder erection machine obtains distance data between the bottom of the front supporting leg and the cover beam, and respectively adjusting the front position, the rear position, the left position and the right position of the front supporting leg according to the obtained data;
s5, erecting a front supporting leg:
after the position of the front supporting leg is adjusted, the front supporting leg oil cylinder continues to descend, the front supporting leg falls on the cover beam, the levelness of the main beam is adjusted to meet the construction standard, and then a front supporting leg bolt is inserted into the cover beam;
s6, moving the T-shaped beam:
moving the T-shaped beam to a position to be installed through a hoisting trolley;
s7, positioning and falling installation of the T-shaped beam:
and controlling a steel wire rope of the hoisting trolley, lowering the T-shaped beam to a position 5-10cm away from the cushion stone on the cover beam, adjusting the position of the T-shaped beam in the front-back direction through a distance measuring system, then dropping the T-shaped beam, and repeating the steps from S1 to S7 to erect the front support leg of the next truss.
2. The method for erecting the front supporting leg of the bridge erecting machine according to claim 1, wherein a track beam is fixed below the front supporting leg oil cylinder, a plurality of supporting and adjusting structures are uniformly arranged at the bottom of the track beam, and the supporting and adjusting structures comprise
The bearing assembly comprises a fixing part and a lifting part which is sleeved outside the fixing part and can move up and down along the fixing part, the fixing part is in threaded connection with the lifting part, and an accommodating cavity is arranged inside the fixing part;
the jacking oil cylinder is positioned in the accommodating cavity and comprises a cylinder barrel and a piston rod, and the top end of the piston rod is fixed at the bottom of the track beam;
and the driving device comprises a motor and a transmission assembly and is used for driving the lifting part to rotate so that the lifting part can ascend or descend along the fixed part.
3. The method for erecting a front leg of a bridge erecting machine according to claim 2, wherein said fixed portion is a hollow cylindrical structure with an upper opening, a fixed plate is provided at a bottom end thereof, said elevating portion is a cylindrical structure with an upper opening and a lower opening, and a bottom portion of said cylinder of said lift cylinder is fixedly provided on said fixed plate.
4. The method for erecting the front supporting leg of the bridge erecting machine according to claim 3, wherein in the step S1, when the front supporting leg oil cylinder is retracted, the method specifically comprises the following steps:
s11, after the front support leg oil cylinder returns oil and contracts to the position that a fixing plate of the support adjusting structure is higher than the cover beam by more than 5cm, the front support leg oil cylinder stops returning oil;
s12, feeding oil into the jacking oil cylinder, extending a piston rod until the fixed plate is in contact with the cover beam so that the fixed part is fixed relative to the cover beam, moving the lifting part downwards along with the fixed plate to be separated from the track beam, and stopping feeding oil into the jacking oil cylinder;
s13, opening the motor, rotating the lifting part, adjusting the height of the lifting part to be matched with the gradient of the next cover beam to enable the track beam to have the gradient meeting the construction requirement, and then closing the motor;
and S14, continuously returning oil to the front supporting leg oil cylinder until the fixed plate is higher than the height of the cushion stone on the cover beam, and then retracting the rear supporting leg.
5. The method for erecting the front leg of the bridge erecting machine according to claim 1, wherein the camera system of the front leg comprises a first camera device arranged below the main beam, and a second camera device arranged above the track beam, and the first camera device and the second camera device are mutually matched to position the front leg above a position on the cover beam for fixing the front leg.
6. The bridge girder erection machine front leg erection method according to claim 5, wherein said ranging system includes a first laser range finder provided in front of said front leg near the bottom for measuring a distance between said front leg and said cap beam in a front-rear direction, a second laser range finder provided on a side of said front leg near the bottom for measuring a distance between said front leg and said cap beam in a left-right direction;
the front and back direction is the advancing direction of the main beam; the left-right direction is a direction perpendicular to the traveling direction of the main beam.
7. The method for erecting a front leg of a bridge girder erection machine according to claim 1, wherein in step S5, the levelness of the main girder is adjusted by the front leg cylinder.
8. The method for erecting a front leg of a bridge erecting machine according to claim 6, wherein said laser ranging system further comprises a third laser range finder disposed above said cover beam, and in step S7, it is determined whether said T-shaped beam reaches a predetermined position in a front-rear direction by said third laser range finder.
9. The method for erecting a front leg of a bridge erecting machine according to claim 2, wherein a motor of said driving device is fixed to said fixing bar, said fixing bar being provided at an edge of said fixing plate;
the transmission assembly comprises a driving gear fixed on an output shaft of the motor and a lifting gear meshed with the driving gear, and the lifting gear is sleeved below the lifting part.
10. The method for erecting a front supporting leg of a bridge erecting machine according to claim 9, wherein an upper limiting plate is arranged at the top of the driving gear, lower limiting plates are symmetrically arranged at the bottom of the driving gear, and the plane where the upper limiting plate and the lower limiting plate are located is parallel to the plane where the driving gear is located; the shortest distance between the rotating shaft of the lifting gear and the upper limiting plate or the lower limiting plate is smaller than or equal to the radius of the root circle of the lifting gear.
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