CN116289639B - Bridge girder erection machine for realizing double U-shaped section girder cantilever assembly and construction process thereof - Google Patents
Bridge girder erection machine for realizing double U-shaped section girder cantilever assembly and construction process thereof Download PDFInfo
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- CN116289639B CN116289639B CN202310204901.1A CN202310204901A CN116289639B CN 116289639 B CN116289639 B CN 116289639B CN 202310204901 A CN202310204901 A CN 202310204901A CN 116289639 B CN116289639 B CN 116289639B
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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
- E01D21/10—Cantilevered erection
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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Abstract
The invention discloses a bridge girder erection machine for realizing double U-shaped segmental girder cantilever assembly and a construction process thereof, wherein the bridge girder erection machine comprises two main girders, a supporting leg system, a first crane, a second crane, a rotary lifting appliance and a high-precision automatic lifting system; the top of the main beam provides a longitudinal moving track for the crane, and the bottom of the main beam is supported by a supporting leg system; the middle supporting leg and the rear supporting leg of the five sets of supporting legs are provided with U-shaped channels at the bottoms of the two main beams; the rotary lifting appliance is arranged at the bottom of the crane crown block, the double U-shaped section beam is suspended by the electric spiral speed reducer device, and the double U-shaped section beam can be driven to rotate and then pass through the U-shaped structures of the middle supporting leg and the rear supporting leg at the narrower side of the double U-shaped section beam; the high-precision automatic hoisting system comprises an overhead travelling crane control console, a hoisting tool control console, a controller, a network transmission unit, a rapid positioning system and a precise positioning system. The invention can meet the construction requirement of two-point symmetrical operation while crossing 30.5m+50m+30m.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge girder erection machine for realizing double U-shaped section girder cantilever assembly and a construction process thereof.
Background
The second working area of the intercity track traffic engineering DS6-TA02 from south Beijing to sentence is a first-station area, the line is laid on the south side of the province road of S122 after going out of the yellow plum station, and after crossing Huang Meihe, the line is gradually transferred into the Baohua mountain road from south to east to across the province road of S122, laid along the Baohua mountain road, and enters the Baohua mountain station after crossing Hua Yangbei roads. The Baohua mountain station is positioned at the east side of the intersection of the Baohua mountain road and the North China road, and is arranged along the Baohua mountain road, wherein the position of HY 37-HY 40 spans the existing yellow east line overpass, and the span is 30.5m+50m+30m.
The traditional cantilever beam bridge pouring mode adopts hanging basket construction operation, but the hanging basket construction has the problems of poor universality, insufficient stability, insufficient safety and the like, and the problems can be avoided by adopting bridge girder erection machine operation. However, aiming at the actual engineering of the intercity rail traffic from Nanjing to sentence, the adopted irregular complex appearance is a double-U-shaped section beam with variable cross section, and no applicable bridge girder erection machine is adopted, so that the phenomenon of eccentric imbalance is very easy to occur in the hoisting process, and the construction efficiency is influenced by manual leveling.
Meanwhile, the current bridge girder erection machine cannot meet the construction requirement of crossing 30.5m+50m+30m and simultaneously performing two-point symmetrical operation, and further the influence on the existing yellow east line overpass is difficult to avoid.
Disclosure of Invention
The invention aims to: the invention aims at overcoming the defects of the prior art, and provides a bridge girder erection machine for realizing double U-shaped section girder cantilever assembly and a construction process thereof, so as to realize construction requirements of two-point symmetrical operation while crossing 30.5m+50m+30m.
The technical scheme is as follows: the invention relates to a bridge girder erection machine for realizing double U-shaped segmental girder cantilever assembly, which comprises two main girders, five sets of supporting legs, a first crane, a second crane, a rotary lifting appliance and a high-precision automatic lifting system;
the tops of the two main beams provide longitudinal moving tracks for a first crane and a second crane, and the bottoms of the two main beams are supported by the supporting leg system; the landing leg system comprises a front landing leg 1 sleeve, a middle landing leg 2 sleeve, a rear landing leg 1 sleeve and a rear auxiliary landing leg 1 sleeve, wherein the front landing leg is a front end fulcrum of the bridge girder erection machine, the middle landing leg 2 sleeve is supported at a continuous Liang Zhongdun position, the rear landing leg is supported at a rear pier top of a construction span of the bridge girder erection machine, the rear auxiliary landing leg is arranged at the tail part of the bridge girder erection machine, and U-shaped channels are formed at the bottoms of two main girders of the middle landing leg and the rear landing leg;
the lifting platforms at the bottoms of the first lifting crown block and the second lifting crown block suspend double U-shaped section beams through the rotary lifting appliance, the rotary lifting appliance comprises an electric spiral speed reducer and a frame body, the electric spiral speed reducer is arranged on the lifting platform, the electric spiral speed reducer can drive the frame body and the suspended double U-shaped section beams to rotate, one narrower side of the double U-shaped section beams passes through U-shaped channels of the middle supporting leg and the rear supporting leg, and the double U-shaped section beams suspended by the first lifting crown block and the second lifting crown block are symmetrically spliced after reaching two sides of the middle supporting leg;
the high-precision automatic hoisting system comprises a crown block control console, a lifting appliance control console, a controller, a network transmission unit, a quick positioning system and an accurate positioning system, wherein the quick positioning system and the accurate positioning system transmit collected data to the controller, the controller is connected with the network transmission unit to send acquired data and receive feedback data, and the controller generates crown block control instructions and lifting appliance control instructions according to the feedback data to respectively control the crown block control console and the lifting appliance control console; the crane control console controls the first crane and the second crane to longitudinally move, translate and lift according to the crane control instruction so that the crane platform reaches a designated position and a designated height, and the lifting appliance control console controls the rotary lifting appliance according to the lifting appliance control instruction;
the accurate positioning system comprises a plurality of scanning type three-dimensional laser measuring instruments, each scanning type three-dimensional laser measuring instrument comprises a laser light source, a scanning mechanism, a CCD camera and a laser control circuit board, the scanning mechanisms of the plurality of scanning type three-dimensional laser measuring instruments are used for selecting a plurality of point areas on tooth grooves of two double-U-shaped section beams which are spliced mutually, the laser light sources emit laser at the selected point areas on the tooth grooves, a lifting appliance control console is used for continuously controlling a rotary lifting appliance to conduct fine adjustment, when the CCD camera cannot capture laser rays, it is proved that the two double-U-shaped section beams correspond to the tooth grooves and are completely matched, and the laser control circuit board outputs data and transmits the data to a controller through a network transmission unit, and the controller generates lifting in-place instructions.
The technical scheme is further improved, the quick positioning system comprises an RTK receiver, an absolute value encoder and a positioning navigation system, wherein the RTK receiver is used for positioning the positions of a first crane and a second crane, the absolute value encoder is arranged on a winch main shaft of the first crane and a winch main shaft of the second crane and used for measuring the distance between a rotating lifting appliance and the RTK receiver in the vertical direction, and the positioning navigation system is respectively arranged on the first crane and the second crane and used for positioning real-time coordinates of the first crane and the second crane; the controller is used for acquiring data acquired by the RTK receiver and the absolute value encoder and real-time coordinates acquired by the positioning navigation system so as to obtain the space positions of the rotating lifting appliance below the first crane and the second crane, the controller is used for acquiring coordinate deviation compared with the target coordinates, the controller generates a crane control instruction according to the space positions and the coordinate deviation, the crane control console controls the first crane and the second crane to reach the target coordinate range according to the crane control instruction, and the crane platform reaches the designated height range.
Further, the main beams are composed of six four railway military beams, each six railway military beams comprises 384 standard triangles, 12 end frameworks, 12 diagonal chords and 12 stay bars, the standard triangles and the standard triangles are connected through steel pins with the diameter of 50mm, every 3 main beams form a group, and every main beam is connected through sleeve bolts to ensure the transverse stability of the main beams.
Further, the front supporting leg is used as a fixed supporting leg and is arranged at the forefront end of the bridge girder erection machine, the top of the front supporting leg is provided with a joist for supporting the girder, and the upper end of the joist is hinged with the girder of the bridge girder erection machine; the rear auxiliary supporting leg is arranged at the tail part of the bridge girder erection machine, the top surface of the rear auxiliary supporting leg is connected with the main girder, the lower part of the rear auxiliary supporting leg is supported on a ground bar-shaped concrete foundation, the length of the bar-shaped concrete foundation is 9m, the width of the bar-shaped concrete foundation is 3m, the depth of the bar-shaped concrete foundation is 0.4m, the original ground is tamped before foundation construction, and the foundation bearing capacity is not less than 100KPa and is replaced and filled when necessary. Further, the two sets of middle supporting legs of the bridge girder erection machine have the same structure, the middle supporting legs are used as supports at the middle pier of the continuous girder, the middle supporting legs are temporarily anchored with the 0# section, the two sets of middle supporting legs support the bridge girder erection machine and the section U Liang Chongliang together during girder erection, and supporting force is transmitted to the 0# section and the bridge pier through the middle supporting legs.
Further, the rear supporting leg is supported on the rear pier top of the bridge girder erection machine construction span, is a supporting point at the rear end of the main girder when being used for erecting a girder, the upper end of the rear supporting leg is hinged with the main girder of the bridge girder erection machine, the lower end of the rear supporting leg is supported on the top surface of a supporting pad stone at the pier top through a steel cushion block, and a supporting rod is arranged at the position of a lower cross beam of the rear supporting leg, so that the rear supporting leg is changed into a rigid supporting leg.
Further, the double-U-shaped section beam adopts a variable cross-section structure, wherein the pier top cross section adopts a U-shaped and box-shaped combined cross section, the midspan cross section adopts a U-shaped cross section, the double-U-shaped section beam consists of a bottom plate and a web plate, and joints between beam ends adopt epoxy resin sealed shear key tooth grooves.
Further, the crown block control console is provided with a winch lifting handle, a crown block walking control handle and a hoisting platform translation button, wherein the winch lifting handle and the crown block walking control handle are stepless speed regulation handles; the lifting handle of the winch is used for controlling the winch to adjust the height of the lifting platform, the winch is connected with the lifting platform by adopting a multi-layer winding structure, the winch is provided with a hydraulic loop for braking at a high speed end and a hydraulic loop for braking at a low speed end so as to cut off a brake, the brake compresses a friction plate to brake under the action of a spring, the braking moment multiple is 1.7, and the disc brake is additionally arranged at the low speed end.
Further, the cross section of the frame body of the rotary lifting tool is fish-bellied, the frame body comprises a first conversion section, a cross beam, an adjusting block, a longitudinal beam and a finish rolling threaded steel anchor, a stand column is arranged at the center of the cross beam, a rotating shaft is arranged in the stand column, adjusting blocks are arranged at two ends of the cross beam, the bottom of each adjusting block is connected with the longitudinal beam, and the bottom of each longitudinal beam is connected with a double U-shaped section beam through the finish rolling threaded steel anchor; the electric spiral speed reducer is connected with a rotating shaft at the center of the frame body through a second conversion joint so as to drive the frame body to rotate by 90 degrees; an adjusting screw rod is arranged between the cross beam and the adjusting block and used for stepless adjustment of the distance between lifting points at two sides of the cross beam within the range of 4840-5360 mm, a first conversion joint is arranged between the adjusting block and the longitudinal beam and used for horizontal leveling rotation of the cross beam; the support body center post is connected with the length direction of the crossbeam through the left and right telescopic cylinders on both sides to carry out the regulation of the left and right height deviation of the two U-shaped section beams on both sides, the support body stand is connected with the width direction of the crossbeam through the height telescopic cylinders on the side edges to carry out the regulation of the elevation of the two U-shaped section beams, and the stroke of the left and right telescopic cylinders and the height telescopic cylinders is 300mm.
The double-T structure synchronous symmetrical suspension splicing operation process for the bridge girder erection machine for realizing double-U-shaped section girder cantilever splicing comprises the following steps:
s1, conveying double-U-shaped section beams to a fixed beam lifting point below a bridge girder erection machine through a fixed conveying route to carry out beam lifting, lifting the two double-U-shaped section beams to a main beam by a first crane crown block and a second crane crown block respectively, quickly positioning a crown block moving instruction output by a system, moving the crown block moving instruction to a target coordinate through a longitudinal moving track on the main beam, controlling the double-U-shaped section beams to rotate for 90 degrees by an electric screw speed reducer, adjusting the two double-U-shaped section beams to lift to the same height as the erected section beams, stopping, slowly adjusting a crown block longitudinal moving oil cylinder, adjusting the distance between the double-U-shaped section beams and the erected section beams to 20cm, and preparing to accurately align with adjacent section beams after the double-U-shaped section beams are stabilized;
s2, position adjustment of the double-U-shaped section beam is carried out through a three-way adjustment function of a rotary lifting appliance below the first lifting crane and the second lifting crane, after the double-U-shaped section beam falls to a designed elevation, an accurate positioning system observes an axis and a horizontal state to output a lifting appliance moving instruction, and fine adjustment is carried out on left and right height deviation of the section beam through a left and right telescopic cylinder on the rotary lifting appliance, so that the section beam is accurately aligned;
s3, after the double U-shaped section beams are accurately aligned, I32I-steel is welded on a steel plate reserved between the section beams, the hoisted double U-shaped section beams are temporarily fixed, and the steel plate is welded on top plates and webs on two sides of the double U-shaped section beams;
s4, after welding the stiffness framework, installing a joint prestress pipeline, wrapping the joint prestress pipeline by using an adhesive tape, adjusting and lap welding reinforcing steel bars at the end heads of the section beams after the installation, adopting a shaping steel die for opposite-pull fixing, adopting a bamboo plywood wood die for a bottom die, casting concrete by using a hanging die, and tensioning formal prestress and grouting after the maintenance reaches the design strength requirement;
s5, repeatedly fixing the beam lifting points, repeating the steps S1 to S4, and erecting the rest section suspension beams to the closure openings;
s6, after the beam body is closed and the permanent prestress tensioning is completed, the temporary tensioning pedestal is removed, the pedestal is required to be plugged by adopting non-shrinkage concrete which is not lower than the mark of the beam body after being removed, waterproof and protective layer construction is performed, the bridge girder erection machine is removed, the whole length beam is penetrated by a threading machine, the two ends of the whole length beam are symmetrically tensioned, and grouting and anchor sealing are performed.
The beneficial effects are that: compared with the prior art, the invention has the advantages that: aiming at the irregular complex appearance of the double-U-shaped section beam, the invention designs a bridge girder erection machine capable of realizing the cantilever assembly of the double-U-shaped section beam and a construction process thereof, wherein a lifting crane is matched with a rotary lifting appliance, the position of the lifting crane can be adjusted transversely and longitudinally, the rotary lifting appliance also has a three-way adjusting function and can rotate 90 degrees in the horizontal direction, the double-U-shaped section beam can conveniently pass through a supporting leg, the smooth assembly of the variable-section prefabricated section can be realized, and the construction requirements of the two-point symmetrical operation while crossing 30.5+50m+30m can be realized
The bridge girder erection machine for realizing double U-shaped segmental girder cantilever assembly can handle girders from fixed handle girders points, and solves the problem that the bilateral symmetry and vertical hoisting of segmental girders have severe requirements on the environment under a bridge. The beam is assembled by 64 beams and 83 pier units with small volume and weight, and has the advantages of low requirements on the field during assembly and disassembly, small occupied field and the like. Meanwhile, the 64 beams and 83 piers are of modularized design, can be combined into different structural forms at will, can adapt to complex and various bridge erection conditions, avoid the condition of one bridge and one device, and can provide a solution for bridge erection under various difficult conditions.
The invention designs the bridge girder erection machine for realizing double U-shaped section girder cantilever assembly, and adopts a high-precision automatic hoisting system to improve the construction efficiency and ensure the precision of the prefabricated component and the accurate alignment of the reserved pore canal of the adjacent section girder in the double T-shaped synchronous symmetrical suspension assembly operation process.
Drawings
FIG. 1 is a schematic diagram of the whole structure of the present invention;
FIG. 2 is a schematic view of a front leg in section;
FIG. 3 is a schematic view of a middle leg in cross section;
FIG. 4 is a schematic view of the rear leg in section;
FIG. 5 is a schematic view of the rear auxiliary leg in cross section;
FIG. 6 is a schematic structural view of a cross section of a crane hanging beam;
FIG. 7 is a U-shaped and box-shaped combined cross-section member structure;
FIG. 8 is an elevation view of a U-shaped continuous rigid frame;
FIG. 9 is a shear key slot layout along section E-E of FIG. 8;
FIG. 10 is a large sample of a shear key;
FIG. 11 is a schematic illustration of a crown block and a rotating spreader;
FIG. 12 is a side view of FIG. 7;
FIG. 13 is a diagram of an electrical control system;
FIG. 14 is a schematic diagram of the whole machine hoisting operation;
FIG. 15 is a diagram of symmetrical hoist mounting alignment;
FIG. 16 is a construction process diagram of a double T-shaped synchronous symmetrical suspension splicing operation.
In the figure: 1. a crane crown block; 2. a main beam; 3. a front leg; 4. middle supporting legs; 5. a rear leg; 6. a rear auxiliary leg; 11. a cross beam; 12. adjusting a screw rod; 13. an adjusting block; 14. a longitudinal beam; 15. finish rolling the deformed steel bar anchor; 16. left and right telescopic cylinders; 17. an electric screw speed reducer; 18. a second switching section; 19. a height telescopic oil cylinder; 20. a first conversion joint.
Detailed Description
The technical scheme of the invention is described in detail below through the drawings, but the protection scope of the invention is not limited to the embodiments.
Example 1: aiming at a continuous T structure with the span of 30.5m+50m+30m of the existing yellow east line overpass, the prefabricated section cantilever assembly method is adopted for construction, so that the influence on the existing yellow east line overpass can be reduced. The traditional construction mode adopts the basket construction operation, but the problems of poor universality, insufficient stability, lack of safety and the like of the basket construction are solved by adopting the bridge girder erection machine operation. However, the current bridge girder erection machine cannot meet the construction requirements of two-point symmetrical operation while crossing 30.5m+50m+30m, and therefore, the bridge girder erection machine for realizing double U-shaped section girder cantilever assembly is developed.
The bridge girder erection machine for realizing double U-shaped segmental girder cantilever assembly shown in fig. 1 comprises two main girders 2, a supporting leg system, a first crane crown block 1, a second crane crown block 1 and a rotary lifting appliance, wherein the supporting leg system comprises a front supporting leg 3, a middle supporting leg 4, a rear supporting leg 5 and a rear auxiliary supporting leg 6. The main beam 2 consists of six four-type military beams of a railway, and the upper parts of the six-type military beams provide longitudinal moving tracks for the first crane 1 and the second crane 1. The girders 2 are composed of 384 standard triangles, 12 end frameworks, 12 diagonal chords and 12 stay bars, steel pins with the diameter of 50mm are used for connection between the standard triangles and between the standard triangles and the end frameworks, the diagonal chords and the stay bars, every 3 girders 2 form a group, and every girder 2 is connected by using sleeve bolts so as to ensure the transverse stability of the girders 2. The introduction of the structure can realize the working condition that the spanning distance of the static main beam 2 structure is extremely long, and meanwhile, the structure is formed by reforming a common four-six type military beam of a railway, so that data are saved, the structure is prevented from being newly manufactured, and the structure can be freely adjusted according to different span requirements and has strong popularization.
The support leg system is formed by combining eight three-type light piers, and is respectively provided with a front support leg 1 sleeve, a middle support leg 2 sleeve, a rear support leg 1 sleeve and a rear auxiliary support leg 1 sleeve. As shown in fig. 2, the front support leg 3 is a front end fulcrum of the bridge girder erection machine, the upper end is hinged with the main girder 2 of the bridge girder erection machine, and is installed at the forefront end of the bridge girder erection machine as a fixed support leg. The top is provided with the joist for bearing main beam, in order to satisfy the stability that main beam and landing leg are connected. The leg rod members mainly comprise: 3.5m rods (1 #), 2m rods (2 #), horizontal connecting rods (4 #), 2m spacing inclined rods (5 #) and connecting pieces (8 #). The supporting legs and the main beam 2 are supported by a bolster with an arc, and the supporting legs are connected with the lower chord of the main beam 2 by U-shaped bolts.
As shown in fig. 3, the bridge girder erection machine is equipped with two identical middle legs as a support at the center pier of the continuous girder when erecting the girder. The middle support leg is a main support leg of the bridge girder erection machine and is temporarily anchored with the 0# section, the bridge girder erection machine and the section Liang Chongliang are supported by the front and rear middle support legs together during girder erection, and supporting force is transmitted to the 0# section and the bridge pier through the support legs.
As shown in fig. 4, the rear supporting leg is supported on the rear pier top of the bridge girder erection machine construction span, is a main girder rear end fulcrum when erecting a girder, and is also formed with a U-shaped channel at the bottom of two main girders, so that the section girders can conveniently pass through after rotating. The lower end is supported on the top surface of the supporting cushion stone at the pier top through a steel cushion block, and the upper end is hinged with the girder of the bridge girder erection machine. In order to ensure the whole longitudinal stability of the bridge girder erection machine and reduce the horizontal force of the tail support, the rear support leg is provided with a supporting rod at the position of the lower cross beam, so that the rear support leg is changed into a rigid support leg.
As shown in fig. 5, the rear auxiliary supporting leg is arranged at the tail part of the bridge girder erection machine, the upper part of the supporting leg is connected with the main girder, the lower part of the supporting leg is supported on a ground bar-shaped concrete foundation, and the length of the bar-shaped concrete foundation is 9m, the width of the bar-shaped concrete foundation is 3m, and the depth of the bar-shaped concrete foundation is 0.4m. The original ground is tamped before foundation construction, the bearing capacity of the foundation is not less than 100KPa, and the foundation is replaced and filled if necessary.
After two U-shaped prefabricated components are transported to the site, the two U-shaped prefabricated components are required to be lifted by a first crane and a second crane successively, symmetrical installation operation is synchronously performed, a rotary lifting appliance is arranged below the crane, the rotary lifting appliance is a frame body with a fish-bellied cross section, two ends of the frame body are provided with suspension connecting pieces for connecting two bottom plates of the double-U-shaped section beam, a rotating shaft is arranged at the center of the top of the frame body, and an electric screw speed reducer drives an open gear at the bottom of the rotating shaft to complete rotation so as to realize that the double-U-shaped section beam is longitudinally transferred to be transverse.
As shown in fig. 6, the first crane and the second crane adopt advanced electric and hydraulic control systems, the automation degree is high, a hoist lifting handle, a crane travel control handle and a lifting platform left and right movement button are arranged on an operation table except for necessary start and stop buttons, the hoist lifting handle and the crane travel control handle are stepless speed regulation handles, and the lifting (traveling) speed is related to the stirring angle of the handles. In order to meet the lifting height requirement, the winding machine adopts multi-layer winding. The high-low speed end double braking action is adopted, the braking hydraulic circuit is cut off, the brake presses the friction plate to brake under the action of the spring, the braking torque multiple is 1.7, the disc brake is additionally arranged at the low speed end, and the hoisting system can be ensured to be safe and reliable even if the hydraulic system and the speed reducer are in failure.
As shown in fig. 7 to 10, the U-beam structure features: the continuous U-beam pier top section in the application adopts a U-shaped and box-shaped combined section, has the full width of 10.88m and is mainly composed of a box beam structure and a U-shaped guardrail plate; the midspan section adopts a U-shaped section and consists of a bottom plate and a web plate. The U beam is in a variable cross section form, and the prefabricated bottom die is considered to be arranged to be adjustable in elevation so as to adapt to the change of the bridge deck vertical curve. The seam between beam ends adopts an epoxy resin close compound shear key slot, so that the installation precision is high during hoisting, and the beam ends are aligned accurately.
Because the structure of the lifted U-shaped prefabricated component is in a variable cross section form, the gravity center of each block is offset, in order to ensure that the component is lifted in the air stably, a leveling oil cylinder is arranged on the lifting appliance cross beam, the stroke of the telescopic oil cylinder is 300mm, and the transverse fine adjustment of the beam section can be realized by adjusting the hydraulic oil cylinder. An adjusting screw rod is arranged between the adjusting block and the cross beam, and stepless adjustment of the distance between the transverse lifting points between 4840 and 5360mm can be achieved.
As shown in fig. 11 and 12: the cross section of the rotary lifting appliance is a fish belly type frame body, the frame body comprises a first conversion joint, a cross beam 11, an adjusting block 13, a second conversion joint, a longitudinal beam 14, finish rolling threaded steel anchors 15 and the like, the adjusting blocks 13 are arranged at two ends of the cross beam 11, the bottom of each adjusting block 13 is connected with the longitudinal beam 14, and the bottom of each longitudinal beam 14 is connected with the double U-shaped section beam through the finish rolling threaded steel anchors 15. The center of the upper part of the frame body is provided with a rotating shaft, and the top part is provided with an electric screw speed reducer 17 which is brought to an open gear to finish rotation, so that the double U-shaped section beam is longitudinally converted into a transverse direction. An adjusting screw rod 12 is arranged between the adjusting block 13 and the cross beam 11, and stepless adjustment of the distance between the transverse hanging points between 4840 and 5360mm can be achieved. A first conversion joint 20 is arranged between the adjusting block 13 and the longitudinal beam 14, and the first conversion joint 20 is used for horizontal leveling rotation of the cross beam 11; the support body stand is connected with the length direction of the crossbeam 11 through the left and right telescopic cylinder 16 of both sides to carry out the regulation of the left and right height deviation of two U type section roof beams, the support body stand is connected with the width direction of crossbeam 11 through the height telescopic cylinder 19 of side, in order to carry out the regulation of two U type section roof beams elevation, the stroke of left and right telescopic cylinder 16, height telescopic cylinder 19 is 300mm.
In order to ensure the installation precision of the U-shaped segmental beams, the slot joints of the shear key between beam ends can be accurately aligned, a high-precision automatic hoisting system is innovatively developed, and as shown in fig. 13, a crown block control console, a hoisting tool control console, a controller, a network transmission unit, a quick positioning system and a precise positioning system of the high-precision automatic hoisting system are innovatively developed, the quick positioning system and the precise positioning system transmit acquired data to the controller, the controller is connected with the network transmission unit to transmit the acquired data, and a receiving controller for feedback data generates crown block control instructions and hoisting tool control instructions according to the feedback data to control the crown block control console and the hoisting tool control console; and the crane control console controls the first crane and the second crane to longitudinally move, translate and lift according to the crane control instruction so that the crane platform reaches a designated position and a designated height, and the lifting appliance control console controls the rotary lifting appliance according to the lifting appliance control instruction.
The quick positioning system comprises an RTK receiver, an absolute value encoder and a positioning navigation system, wherein the RTK receiver is used for positioning the positions (centimeter level, the positioning accuracy of plus or minus 2 centimeters can be achieved on the premise of being greater than or equal to 15 satellites) of the first crane and the second crane, the absolute value encoder is arranged on a winch main shaft of the first crane and the second crane, the absolute value encoder is used for measuring the distance between the rotating lifting appliance and the RTK receiver in the vertical direction, and the accurate spatial positions of the two rotating lifting appliances can be known based on the measurement. The positioning navigation system is respectively arranged on the two crane trucks and is used for positioning real-time coordinates of the first crane truck and the second crane truck, and the wireless network bridge transmits signals through the local area network so as to achieve the functions of data transmission and data reception; the controller compares the real-time coordinates with the target coordinates to obtain coordinate deviation and feeds the coordinate deviation back to the controller, and the controller controls the first crane and the second crane to move towards the target coordinates.
The accurate level positioning system starts working within the range of 0.5m from the target position of the hoisting member, adopts four scanning three-dimensional laser measuring instruments, and each scanning three-dimensional laser measuring instrument mainly comprises a laser light source, a scanning mechanism, a CCD camera, a laser control circuit board and the like. The scanning mechanism selects four point areas on the tooth sockets spliced by each other, laser is respectively emitted to tooth crest and tooth root areas of the tooth sockets through the laser light source, the controller continuously sends out instructions in the process to enable the rotary lifting tool to conduct fine adjustment, when the CCD camera cannot capture laser rays, the tooth sockets are proved to be completely matched, the tooth sockets are lifted in place, the laser control circuit board is transmitted with the controller through the network transmission unit, and the controller gives out lifting instructions.
Example 2: the overall construction scheme is as follows: firstly, constructing a middle pier top 0# block and setting a temporary support; then adopting a bridge fabrication machine to carry out symmetrical cantilever assembly of prefabricated sections; meanwhile, a full framing is erected to construct a side span cast-in-situ section, and a side span wet joint is poured to complete side span closure; and finally, performing mid-span closure, removing the temporary support, and finishing system conversion.
According to the structural characteristics and the installation requirements of the U-shaped beam, the segmental U-shaped beam suspension splicing bridge girder erection machine is developed, and the construction process is innovated, as shown in fig. 16, the whole construction process adopts a double-T-structure synchronous symmetrical suspension splicing operation process, and the concrete contents are as follows:
s1, conveying a double-U-shaped section beam prefabricated part to a fixed girder lifting point below a bridge girder erection machine through a fixed conveying route to lift girders, respectively lifting the two double-U-shaped section beams to a girder by a first crane crown block and a second crane crown block, quickly positioning a crown block moving instruction output by a system, moving the crown block moving instruction to a target coordinate through a longitudinal moving track on the girder, controlling the double-U-shaped section beams to rotate for 90 degrees by an electric screw speed reducer, stopping after adjusting the two double-U-shaped section beams to lift to the same height as the erected section beams, slowly adjusting a crown block longitudinal moving oil cylinder, and preparing to accurately align the double-U-shaped section beams with adjacent section beams after the double-U-shaped section beams are stabilized;
s2, adjusting the position of the double-U-shaped section beam by a three-way adjusting function of the rotary lifting appliance below the first lifting crane and the second lifting crane, namely the elevation of the section beam, the plane rotation angle and the horizontal left-right deviation, and observing the axis and the horizontal state by an accurate positioning system after the double-U-shaped section beam falls to the designed elevation so as to output a lifting appliance moving instruction, and finely adjusting the left-right height deviation of the section beam by a left-right telescopic oil cylinder on the rotary lifting appliance, so that the section beam is accurately aligned;
s3, welding I-steel of I32 on reserved steel plates between the sections after accurate alignment of the prefabricated components, temporarily fixing the hoisting section blocks, and welding the steel plates on top ends of top plates and web plates on two sides of the section beam.
S4, after welding the stiffness framework, installing a joint pre-stress pipeline, wrapping the joint pre-stress pipeline by using an adhesive tape, adjusting and lap welding reinforcing steel bars at the end heads of the section beams after the installation is completed, adopting a shaping steel die for opposite-pulling fixation, adopting a bamboo plywood wood die for a bottom die, and casting concrete by using a hanging die. And after the maintenance reaches the design strength requirement, stretching the formal prestress and grouting.
S5, repeating a beam lifting point beam lifting, running a crane, pre-assembling a segmental beam, gluing, tensioning and other construction steps to erect the rest segmental cantilever beams to a closure opening, dismantling a temporary tensioning pedestal after the beam body is closed and the permanent prestress tensioning is finished, plugging by adopting non-shrinkage concrete which is not lower than the mark of the beam body after the pedestal is dismantled, and constructing a waterproof and protective layer. After the bridge girder erection machine is dismantled, the whole penetrating length of the penetrating bundles is achieved through the threading machine, two ends are symmetrically tensioned, and grouting and anchor sealing are carried out.
As described above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A bridge crane for realizing two U-shaped section girder cantilever assembly, its characterized in that: the lifting device comprises two main beams, a supporting leg system, a first crane, a second crane, a rotary lifting appliance and a high-precision automatic lifting system;
the tops of the two main beams provide longitudinal moving tracks for a first crane and a second crane, and the bottoms of the two main beams are supported by the supporting leg system; the landing leg system comprises a front landing leg 1 sleeve, a middle landing leg 2 sleeve, a rear landing leg 1 sleeve and a rear auxiliary landing leg 1 sleeve, wherein the front landing leg is a front end fulcrum of the bridge girder erection machine, the middle landing leg 2 sleeve is supported at a continuous Liang Zhongdun position, the rear landing leg is supported at a rear pier top of a construction span of the bridge girder erection machine, the rear auxiliary landing leg is arranged at the tail part of the bridge girder erection machine, and U-shaped channels are formed at the bottoms of two main girders of the middle landing leg and the rear landing leg;
the lifting platforms at the bottoms of the first lifting crown block and the second lifting crown block suspend double U-shaped section beams through the rotary lifting appliance, the rotary lifting appliance comprises an electric spiral speed reducer and a frame body, the electric spiral speed reducer is arranged on the lifting platform, the electric spiral speed reducer can drive the frame body and the suspended double U-shaped section beams to rotate, one narrower side of the double U-shaped section beams passes through U-shaped channels of the middle supporting leg and the rear supporting leg, and the double U-shaped section beams suspended by the first lifting crown block and the second lifting crown block are symmetrically spliced after reaching two sides of the middle supporting leg;
the high-precision automatic hoisting system comprises a crown block control console, a lifting appliance control console, a controller, a network transmission unit, a quick positioning system and an accurate positioning system, wherein the quick positioning system and the accurate positioning system transmit collected data to the controller, the controller is connected with the network transmission unit to send acquired data and receive feedback data, and the controller generates crown block control instructions and lifting appliance control instructions according to the feedback data to respectively control the crown block control console and the lifting appliance control console; the crane control console controls the first crane and the second crane to longitudinally move, translate and lift according to the crane control instruction so that the crane platform reaches a designated position and a designated height, and the lifting appliance control console controls the rotary lifting appliance according to the lifting appliance control instruction;
the accurate positioning system comprises a plurality of scanning type three-dimensional laser measuring instruments, wherein each scanning type three-dimensional laser measuring instrument comprises a laser light source, a scanning mechanism, a CCD camera and a laser control circuit board, the scanning mechanisms of the plurality of scanning type three-dimensional laser measuring instruments are used for selecting a plurality of point areas on tooth grooves of two double-U-shaped section beams which are spliced together, the laser light source irradiates laser on the selected point areas on the tooth grooves, a lifting appliance control console is used for continuously controlling a rotary lifting appliance to conduct fine adjustment, when the CCD camera cannot capture laser rays, it is proved that the two double-U-shaped section beams correspond to the tooth grooves and are completely matched, and the laser control circuit board outputs data and transmits the data to a controller through a network transmission unit, and the controller generates lifting in-place instructions;
the quick positioning system comprises an RTK receiver, an absolute value encoder and a positioning navigation system, wherein the RTK receiver is used for positioning the positions of a first crane and a second crane, the absolute value encoder is arranged on a winch main shaft of the first crane and the second crane and used for measuring the distance between a rotating lifting appliance and the RTK receiver in the vertical direction, and the positioning navigation system is respectively arranged on the first crane and the second crane and used for positioning real-time coordinates of the first crane and the second crane; the controller is used for acquiring data acquired by the RTK receiver and the absolute value encoder and real-time coordinates acquired by the positioning navigation system so as to obtain the space positions of the rotating lifting appliance below the first crane and the second crane, the controller is used for acquiring coordinate deviation compared with the target coordinates, the controller generates a crane control instruction according to the space positions and the coordinate deviation, the crane control console controls the first crane and the second crane to reach the target coordinate range according to the crane control instruction, and the crane platform reaches the designated height range.
2. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the main beams are composed of six four railway military beams and comprise 384 standard triangles, 12 end frameworks, 12 inclined chords and 12 supporting rods, wherein the standard triangles and the standard triangles are connected through steel pins with the diameter of 50mm, every 3 main beams form a group, and each main beam is connected through sleeve bolts so as to ensure the transverse stability of the main beams.
3. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the front support leg is used as a fixed support leg and is arranged at the forefront end of the bridge girder erection machine, the top of the front support leg is provided with a joist for supporting the girder, and the upper end of the joist is hinged with the girder of the bridge girder erection machine; the rear auxiliary supporting leg is arranged at the tail part of the bridge girder erection machine, the top surface of the rear auxiliary supporting leg is connected with the main girder, the lower part of the rear auxiliary supporting leg is supported on a ground bar-shaped concrete foundation, the length of the bar-shaped concrete foundation is 9m, the width of the bar-shaped concrete foundation is 3m, the depth of the bar-shaped concrete foundation is 0.4m, the original ground is tamped before foundation construction, and the foundation bearing capacity is not less than 100KPa and is replaced and filled when necessary.
4. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the two sets of middle supporting legs of the bridge girder erection machine have the same structure, are used as supports at the middle piers of the continuous girder when the girder is erected, are temporarily anchored with the No. 0 section, and support the bridge girder erection machine and the section U Liang Chongliang together through the two sets of middle supporting legs when the girder is erected, and the supporting force is transmitted to the No. 0 section and the bridge pier through the middle supporting legs.
5. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the rear support leg is supported on the rear pier top of the bridge girder erection machine construction span, is a fulcrum at the rear end of the girder when the girder erection machine is erected, the upper end of the girder is hinged with the girder of the bridge girder erection machine, the lower end of the girder erection machine is supported on the top surface of a supporting pad stone of the pier top through a steel cushion block, and a supporting rod is arranged at the position of a lower cross beam of the rear support leg, so that the rear support leg is changed into a rigid support leg.
6. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the double-U-shaped section beam adopts a variable cross-section structure, wherein the pier top cross section adopts a U-shaped and box-shaped combined cross section, the midspan cross section adopts a U-shaped cross section, the double-U-shaped section beam consists of a bottom plate and a web plate, and joints between beam ends adopt epoxy resin dense compound shear key tooth grooves.
7. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 1, wherein: the crane control console is provided with a winch lifting handle, a crane walking control handle and a lifting platform translation button, and the winch lifting handle and the crane walking control handle are stepless speed regulation handles; the lifting handle of the winch is used for controlling the winch to adjust the height of the lifting platform, the winch is connected with the lifting platform by adopting a multi-layer winding structure, the winch is provided with a hydraulic loop for braking at a high speed end and a hydraulic loop for braking at a low speed end so as to cut off a brake, the brake compresses a friction plate to brake under the action of a spring, the braking moment multiple is 1.7, and the disc brake is additionally arranged at the low speed end.
8. The bridge girder erection machine for realizing double-U-shaped section girder cantilever assembly according to claim 6, wherein: the cross section of the frame body of the rotary lifting tool is fish-bellied, the frame body comprises a first conversion section, a cross beam, an adjusting block, a longitudinal beam and a finish rolling screw thread steel anchor, a stand column is arranged in the center of the cross beam, a rotating shaft is arranged in the stand column, the adjusting blocks are arranged at two ends of the cross beam, the bottom of each adjusting block is connected with the longitudinal beam, and the bottom of each longitudinal beam is connected with a double U-shaped section beam through the finish rolling screw thread steel anchor; the electric spiral speed reducer is connected with a rotating shaft at the center of the frame body through a second conversion joint so as to drive the frame body to rotate by 90 degrees; an adjusting screw rod is arranged between the cross beam and the adjusting block and used for stepless adjustment of the distance between lifting points at two sides of the cross beam within the range of 4840-5360 mm, a first conversion joint is arranged between the adjusting block and the longitudinal beam and used for horizontal leveling rotation of the cross beam; the support body center post is connected with the length direction of the crossbeam through the left and right telescopic cylinders on both sides to carry out the regulation of the left and right height deviation of the two U-shaped section beams on both sides, the support body stand is connected with the width direction of the crossbeam through the height telescopic cylinders on the side edges to carry out the regulation of the elevation of the two U-shaped section beams, and the stroke of the left and right telescopic cylinders and the height telescopic cylinders is 300mm.
9. The double-T-structure synchronous symmetrical suspension splicing construction process by adopting the bridge girder erection machine for realizing double-U-shaped section girder cantilever splicing as claimed in claim 1 is characterized by comprising the following steps:
s1, conveying double-U-shaped section beams to a fixed beam lifting point below a bridge girder erection machine through a fixed conveying route to carry out beam lifting, lifting the two double-U-shaped section beams to a main beam by a first crane crown block and a second crane crown block respectively, quickly positioning a crown block moving instruction output by a system, moving the crown block moving instruction to a target coordinate through a longitudinal moving track on the main beam, controlling the double-U-shaped section beams to rotate for 90 degrees by an electric screw speed reducer, adjusting the two double-U-shaped section beams to lift to the same height as the erected section beams, stopping, slowly adjusting a crown block longitudinal moving oil cylinder, adjusting the distance between the double-U-shaped section beams and the erected section beams to 20cm, and preparing to accurately align with adjacent section beams after the double-U-shaped section beams are stabilized;
s2, position adjustment of the double-U-shaped section beam is carried out through a three-way adjustment function of a rotary lifting appliance below the first lifting crane and the second lifting crane, after the double-U-shaped section beam falls to a designed elevation, an accurate positioning system observes an axis and a horizontal state to output a lifting appliance moving instruction, and fine adjustment is carried out on left and right height deviation of the section beam through a left and right telescopic cylinder on the rotary lifting appliance, so that the section beam is accurately aligned;
s3, after the double U-shaped section beams are accurately aligned, I32I-steel is welded on a steel plate reserved between the section beams, the hoisted double U-shaped section beams are temporarily fixed, and the steel plate is welded on top plates and webs on two sides of the double U-shaped section beams;
s4, after welding the stiffness framework, installing a joint prestress pipeline, wrapping the joint prestress pipeline by using an adhesive tape, adjusting and lap welding reinforcing steel bars at the end heads of the section beams after the installation, adopting a shaping steel die for opposite-pull fixing, adopting a bamboo plywood wood die for a bottom die, casting concrete by using a hanging die, and tensioning formal prestress and grouting after the maintenance reaches the design strength requirement;
s5, repeatedly fixing the beam lifting points, repeating the steps S1 to S4, and erecting the rest section suspension beams to the closure openings;
s6, after the beam body is closed and the permanent prestress tensioning is completed, the temporary tensioning pedestal is removed, the pedestal is required to be plugged by adopting non-shrinkage concrete which is not lower than the mark of the beam body after being removed, waterproof and protective layer construction is performed, the bridge girder erection machine is removed, the whole length beam is penetrated by a threading machine, the two ends of the whole length beam are symmetrically tensioned, and grouting and anchor sealing are performed.
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