CN114134811B - Steel truss girder traction frame and erection method of steel truss girder for bridge - Google Patents
Steel truss girder traction frame and erection method of steel truss girder for bridge Download PDFInfo
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- CN114134811B CN114134811B CN202111213559.9A CN202111213559A CN114134811B CN 114134811 B CN114134811 B CN 114134811B CN 202111213559 A CN202111213559 A CN 202111213559A CN 114134811 B CN114134811 B CN 114134811B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 219
- 239000010959 steel Substances 0.000 title claims abstract description 219
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000009434 installation Methods 0.000 claims abstract description 43
- 238000010276 construction Methods 0.000 claims abstract description 39
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 6
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- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
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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 bridge erection, in particular to a steel truss girder traction frame and a bridge steel truss girder erection method. The steel truss traction frame is used for construction of a large bridge assembled by a plurality of sections of steel trusses, and comprises a traction device which is positioned at the front end of an installation bridge position; the sliding brackets are positioned at the installation bridge positions and are arranged at intervals along the arrangement direction of the large bridge frame; the splicing brackets are positioned at the rear end of the installation bridge position and are arranged at intervals along the direction of the large bridge frame; wherein the spliced bracket is used for bearing the steel truss girder; the traction device is suitable for pulling the steel truss girder to move to the installation bridge position along the sliding bracket. And pre-assembling the steel truss girder and the guide girder on the assembling bracket, and then dragging the steel truss girder to a final position for a plurality of times by utilizing a sliding slideway arranged on the sliding bracket to finish bridge construction. The method has the advantages of high installation speed, safe and reliable construction, no dependence on natural environment and the like.
Description
Technical Field
The invention relates to the technical field of bridge erection, in particular to a steel truss girder traction frame and a bridge steel truss girder erection method.
Background
Along with the development of China high-speed railways, a large number of bridge steel girder constructions are driven. Along with the continuous promotion of the scale of the bridge, the construction difficulty of a large-scale bridge structure in a complex environment is also increasingly focused and researched, such as stress analysis and safety evaluation of key nodes in a steel beam structure in the construction process. The dragging construction technology is an important construction technology in the construction of the large-span steel truss girder, the construction period can be effectively shortened, and the engineering quality can be effectively ensured under the condition that the normal operation of the existing line is not influenced. The construction is carried out by using a pulling method, so that the problems of pier feeding of guide beams and pier passing of node sliding blocks in the longitudinal movement process are effectively avoided, and the continuity of the working procedure is better ensured. Not only the construction speed is high, but also the construction is safe and reliable. The lower bearing type simply supported steel truss girder is integrally formed by longitudinal beams, transverse beams, web members, upper chords and lower chords and bears force together, has the advantages of high rigidity, good dynamic performance, low building height, low noise and vibration during driving and the like, and is one of the common structural forms of high-speed railway large-span bridges.
The steel truss bridge has more nodes and rods, the node connection structure is complex, and great difficulty is brought to construction. The dragging construction method has the advantages of economy, safety, rapidness, no interference, small occupied space and the like, and is widely applied to the construction of large-span bridges. Therefore, the research on the construction technology of the large-span underbearing steel truss bridge, particularly the traction construction technology, has important engineering application value.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the bridge construction method solves the problems that the bridge span is large and the normal operation of the existing line cannot be influenced.
The technical scheme adopted for solving the technical problems is as follows: in a first aspect, the invention provides a steel truss girder traction frame for construction of a bridge assembled by a plurality of sections of steel truss girders, which comprises a traction device, a first traction device and a second traction device, wherein the traction device is positioned at the front end of a mounting bridge position; the sliding brackets are positioned at the installation bridge positions and are arranged at intervals along the arrangement direction of the large bridge frame; the splicing brackets are positioned at the rear end of the installation bridge position and are arranged at intervals along the direction of the large bridge frame; wherein the spliced bracket is used for bearing the steel truss girder; the traction device is suitable for pulling the steel truss girder to move to the installation bridge position along the sliding bracket.
Further, the assembly bracket comprises a cross frame; the assembly platform is arranged on the well frame; the assembling slide way is paved at the top of the well frame and is used for bearing the steel truss girder; wherein the cross frame is a three-dimensional frame structure formed by connecting a plurality of steel pipes; and the assembly platform is horizontally arranged on the three-dimensional frame structure.
Further, the sliding bracket comprises a plurality of upright posts; the connecting system consists of a plurality of lattice column supports and is used for connecting the upright posts; the sliding slideway is fixed at the top of the upright post; the sliding seats are used for bearing the steel truss girder; the traction device is suitable for driving the sliding seat to slide along the slideway so as to move the steel truss girder; the upright posts are suitable for being arranged into two rows along the arrangement direction of the large bridge so as to form two sliding slide ways which are arranged at intervals; the sliding seat is correspondingly matched with the sliding slideway; and limiting blocks are arranged on two sides of the bottom of the sliding seat, and the width of the sliding seat is larger than that of the sliding slide way, so that the two limiting blocks are clamped on two sides of the sliding slide way.
Further, the sliding support further comprises an operation platform positioned at the top of the connecting system and four limit deviation correcting devices positioned on the operation platform, wherein the limit deviation correcting devices are distributed on two sides of each row of upright posts and are used for correcting sliding seats correspondingly matched on the sliding slide ways; the limit deviation correcting device comprises a deviation correcting mechanism and a limit mechanism matched with the deviation correcting mechanism; the deviation correcting mechanism is suitable for driving the sliding seat and the sliding slideway to generate horizontal displacement; the limiting mechanism is suitable for limiting vertical displacement between the sliding seat and the sliding slideway; the deviation correcting mechanism comprises a horizontally arranged jacking plate; the wedge-shaped block is slidably arranged on the upper surface of one end of the jacking plate; the jacking component is positioned below one end of the jacking plate; the jacking assembly is suitable for driving one end of the jacking plate to move upwards so as to jack the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway; a sliding through hole is formed in one end of the jacking plate; the bottom of the wedge block is provided with a sliding column which is suitable for penetrating through the sliding through hole; when the wedge block is jacked into the gap between the limiting block and the side face of the sliding slideway, the sliding column horizontally slides along the sliding through hole.
Further, the limiting mechanism comprises a supporting seat, and is rotationally connected with the middle part of the jacking plate through a rotating shaft; a L-shaped rod or a L-shaped rod is positioned at the other end of the jacking plate; the other end of the jacking plate is provided with a mounting through hole; the vertical part of the L-shaped rod or the L-shaped rod is suitable for being inserted into the mounting through hole in a sliding way and locked by a locking piece; the horizontal part of the L-shaped rod or the inverted L-shaped rod is suitable for extending to the upper part of the sliding seat; when the wedge block is jacked into the gap between the limiting block and the side face of the sliding slideway, one end of the jacking plate moves upwards, and the other end of the jacking plate moves downwards by taking the rotating shaft as the center, so that the horizontal part of the L-shaped rod or the L-shaped rod is driven to abut against the top of the sliding seat, and the sliding seat is limited to be lifted.
In a second aspect, the invention provides a method for erecting a steel truss girder for a bridge, which is used for construction of a bridge assembled by a plurality of sections of steel truss girders, and comprises the following steps: installing a steel truss girder traction frame, namely embedding a traction device at the front end of an installation bridge position, installing a plurality of sliding brackets at intervals at the installation bridge position, and installing a plurality of spliced brackets at the rear end of the installation bridge position; the first stage of assembling of the steel truss girder, namely connecting the front section of the guide girder and the front sections of the steel truss girders on an assembling bracket to form a first assembling component, and arranging a front anchor point of a traction device at the front end of the guide girder; the first stage of dragging and sliding of the steel truss girder, namely dragging and sliding the first assembly component to the sliding bracket by utilizing a traction device to vacate the assembly bracket; assembling the steel truss in the second stage, namely assembling a plurality of steel truss rear section chords on the vacated assembling bracket to form a second assembling component, and assembling the second assembling component with the tail end of the first assembling component to form a complete bridge steel truss whole; and in the second stage of dragging and sliding of the steel truss girder, the whole full-bridge steel truss girder is circularly dragged to the installation bridge position by utilizing the dragging device.
Further, the front end pre-burying traction device at the installation bridge position comprises a pre-burying traction assembly, a traction counterforce seat and a steel strand assembly at the top of the bridge pier; the method comprises the steps that a plurality of sliding brackets are installed at intervals at the installation bridge position and comprise three-dimensional steel buttresses which are formed by connecting steel pipes and channel steel, so as to form upright columns; a plurality of lattice column supports form a connecting system which is connected between the upright posts; a sliding slideway is formed by welding H-shaped steel and a steel pipe and is fixedly arranged at the top of the upright post; the sliding seat is arranged on the corresponding sliding slideway; a limit deviation correcting device is arranged at the top of the latticed cylindrical support; the top installation limiting deviation correcting device at lattice column support includes: an operation platform is arranged at the top of the latticed cylindrical support; a supporting seat is arranged on the operation platform, and the middle part of the jacking plate is arranged on the supporting seat through a rotating shaft; a wedge block is slidably arranged at one end of the jacking plate, the other end of the jacking plate slidably passes through the vertical part of the L-shaped rod or the L-shaped reverse rod, and the horizontal part of the L-shaped rod or the L-shaped reverse rod extends to the upper part of the sliding seat; the vertical part of the L-shaped rod or the L-shaped rod is locked on the jacking plate through the locking of the fastener; installing a jacking assembly on the operation platform and enabling the jacking assembly to be positioned below one end of the jacking plate; the mounting of a plurality of spliced brackets at the rear end of the mounting bridge position comprises the steps of connecting a plurality of steel pipes into a three-dimensional frame structure to form a cross frame; a bolster is arranged at the top of the cross frame to form an assembly platform; an assembling slideway is welded by adopting H-shaped steel and steel pipes on an assembling platform; the steel truss girder traction frame is installed, the steel truss girder traction frame further comprises a construction installation platform, the construction installation platform comprises a sliding support and an assembling support which are connected into a whole through a plurality of lattice column structures to form a sliding jig frame, and transverse bridges are arranged on the sliding support and the assembling support to form the installation platform.
Further, the first stage assembly of the steel truss comprises: the method of hoisting and assembling is adopted, namely, the lower chord of the front section of the steel truss girder is assembled in advance and the bolting inspection of the node bolts is completed; lifting the lower chord of the front section of the steel truss girder and the front section of the guide girder to an assembly platform by a double crane, and then assembling the upper chord of the front section of the steel truss girder on the assembly platform; and welding the steel truss girder front section and the guide girder front section into a whole.
Further, the first stage pull slip of the steel truss girder includes: the method comprises the steps of setting a rear anchor point of a traction device at the bottom of a lower chord of a front section of a steel truss girder and reserving a support hole, connecting the rear anchor point with a lower chord bolt of the front section of the steel truss girder, enabling a steel strand to pass through the rear anchor point, starting a traction assembly and a traction counterforce seat, and leading the front section of the steel truss girder and the front section of the guide girder to advance along a spliced slideway; according to the designed sliding slideway length, the segment length of one steel truss girder is pulled to leave an assembly bracket out; and opening the jacking assembly, jacking the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway, and the pressure maintaining sliding seat is not separated from the sliding slideway, so that the relative position of the front section of the steel truss girder and the sliding slideway is adjusted.
Further, the second stage assembly of the steel truss comprises: the method adopts a hoisting assembly mode, namely, the lower chord of the rear section of the steel truss girder is assembled in advance; lifting the lower chord of the rear steel truss girder rear section to an unoccupied spliced bracket by a crane, and then assembling the upper chord of the rear steel truss girder section with the lower chord of the rear steel truss girder section on the unoccupied spliced bracket to form the rear steel truss girder section; the rear section of the steel truss girder is connected with the front section of the steel truss girder through high-strength bolts to form a whole steel truss girder; and opening the jacking assembly, jacking the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway, and the pressure maintaining sliding seat is not separated from the sliding slideway, so that the relative position of the whole steel truss girder and the sliding slideway is adjusted.
The beneficial effects of the invention are as follows: the steel truss girder dragging frame designed by the invention can be used for construction of a bridge assembled by a plurality of sections of steel truss girders, the steel truss girders are assembled and borne through the assembling brackets, the sliding supporting points of the steel truss girders are provided through the sliding brackets, the steel truss girders are dragged to the designed positions by utilizing the dragging device, and the problems that the assembling sites of the steel truss girders are limited and can not be assembled at one time by adopting a method of assembling the steel truss girders in two stages and dragging and sliding in place are effectively solved, the problem that shipping is not interrupted during construction is effectively solved, the using quantity of the brackets is saved, and the economic benefit is remarkable.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a side view of a slip bracket;
FIG. 2 is a schematic view of the assembly of the carriage and glide slope;
FIG. 3 is a cross-sectional view of the limit deviation correcting device;
FIG. 4 is a schematic view of the construction of the splice holder;
FIG. 5 is a schematic illustration of a first stage of assembly of steel stringers;
FIG. 6 is a schematic illustration of a second stage of assembly of steel stringers;
FIG. 7 is a schematic illustration of a second stage pull slip of a steel truss;
FIG. 8 is an enlarged schematic view of the present invention at A in FIG. 5;
in the figure:
the steel truss girder comprises a steel truss girder 1, a first assembly component 11, a front anchor point 12, a rear anchor point 13, a support hole 14 and a second assembly component 15;
a traction device 2, a traction counterforce seat 21 and a steel strand assembly 22;
the device comprises a sliding bracket 3, a stand column 31, a connecting system 32, a sliding slideway 33, a sliding seat 34, a polytetrafluoroethylene plate 341, a limiting block 342, a limiting deviation correcting device 35, a deviation correcting mechanism 351, a jacking plate 3511, a sliding through hole 3512, a wedge block 3513, a jacking component 3514, a sliding column 3515, a limiting mechanism 352, a supporting seat 3521, a rotating shaft 3522, a reverse-shaped rod 3523, a mounting through hole 3524, a locking piece 3525 and an operating platform 36;
the assembly bracket 4, the assembly slideway 41, the well frame 42 and the assembly platform 43;
a guide beam 5;
and a bridge pier 6.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will now be described in detail with reference to the accompanying drawings. The figure is a simplified schematic diagram illustrating the basic structure of the invention only by way of illustration, and therefore it shows only the constitution related to the invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 8, the steel truss girder traction frame of the present embodiment is used for bridge construction of multi-section steel truss girder 1 assembly. The steel truss traction frame comprises a traction device 2, wherein the traction device 2 is positioned at the front end of an installation bridge position, and the traction device 2 is suitable for pulling the steel truss 1 to move to the installation bridge position along a sliding bracket 3; the sliding brackets 3 are positioned at the installation bridge positions and are arranged at intervals along the direction of the large bridge frame, and are used for providing sliding fulcrums for the steel truss girder 1; the support 4 is assembled to a plurality of, is located the rear end at installation bridge position and establishes the direction interval setting along big crane span structure, assemble support 4 and be used for bearing steel truss girder 1. The sliding brackets 3 and the spliced brackets 4 are similar in structure, the size of the sliding brackets can be adjusted according to specific construction conditions, and the specific structure and connection relation of each part in the steel truss traction frame are as follows:
as shown in fig. 4, as an alternative embodiment of the splice holder 4, the splice holder 4 includes a derrick 42, and the derrick 42 is mainly composed of 4 derricksThe steel pipes are formed by connecting angle steel and channel steel and are of a three-dimensional frame structure as a whole; an assembly platform 43 arranged on the derrick 42 for providing a worker construction platform; the assembling slide way 41 is paved on the top of the cross frame 42 and is used for bearing the steel truss girder 1, and the cross frame 42 and the assembling slide way 41 are welded and reinforced by utilizing triangular steel plates.
As shown in fig. 1, as an alternative embodiment of the sliding bracket 3, the sliding bracket 3 includes a plurality of columns 31 as main bearing columns, and the columns 31 are adapted to be arranged in two rows along the direction of the large bridge so as to form two sliding slides 33 arranged at intervals; the connecting system 32 is composed of a plurality of lattice column supports and is used for connecting the columns 31, so that construction can be facilitated, and the overall stability of the sliding support 3 is increased; a sliding slideway 33 fixed on the top of the upright 31; a plurality of sliding seats 34 on which the steel truss girder 1 is supported; and the traction device 2 is suitable for driving the sliding seat 34 to slide along the slideway so as to move the steel truss girder 1. The sliding bracket 3 also comprises an operation platform 36 positioned at the top of the connecting system 32 and four limit deviation correcting devices 351 positioned on the operation platform 36. The single bracket specification of the sliding bracket 3 is 10.6mX6.6m, and the upright post 31 can be adoptedThe steel pipe of (2) is passed through channel steel and->Is connected and combined with the steel pipes to form the three-dimensional steel buttress.
As shown in FIG. 2, the sliding seat 34 is correspondingly matched with the sliding slideway 33, the sliding seat 34 can be made of 4-piece I500I-steel, and a stiffening plate is arranged in the middle. The bottom of the sliding seat 34 is provided with a polytetrafluoroethylene plate 341 which is placed on the sliding slideway 33, so that the friction force generated by the relative sliding of the sliding seat 34 and the sliding slideway 33 can be reduced; and two sides of the bottom of the sliding seat 34 are respectively provided with a limiting block 342, and the width of the sliding seat 34 is larger than that of the sliding rail 33, so that the two limiting blocks 342 are clamped at two sides of the sliding rail 33 to prevent the sliding seat 34 from sliding out of the sliding rail 33.
As an alternative embodiment of the limit and deviation rectifying device 35, as shown in fig. 3, in order to center the position of the slide 34 on the sliding slideway 33, and not to deviate to one side or form an included angle with the dragging direction of the steel beam, the limit and deviation rectifying device 35 is provided to prevent adverse effect on dragging. The limiting and correcting devices 35 are distributed on two sides of each row of upright posts 31, the limiting and correcting devices 35 laterally push the sliding seat 34 through the jacking component 3514 to correct the sliding seat 34 correspondingly matched with the sliding seat 33, the limiting and correcting devices 35 comprise a correcting mechanism 351 and a limiting mechanism 352 matched with the correcting mechanism 351, the correcting mechanism 351 is suitable for driving the sliding seat 34 to generate horizontal displacement with the sliding seat 33, and the limiting mechanism 352 is suitable for limiting the sliding seat 34 to generate vertical displacement with the sliding seat 33.
Specifically, the specific deviation correcting process of the deviation correcting mechanism 351 is as follows: the deviation correcting mechanism 351 comprises a horizontally arranged jacking plate 3511, and a sliding through hole 3512 is formed in one end of the jacking plate 3511; a wedge 3513 slidably installed on an upper surface of one end of the jacking plate 3511; the jacking component 3514 is located below one end of the jacking plate 3511, and the jacking component 3514 is adapted to drive one end of the jacking plate 3511 to move upwards, so as to jack the wedge 3513 into the gap between the limiting block 342 and the side surface of the sliding rail 33, and generate horizontal displacement between the sliding seat 34 and the sliding rail 33. The bottom of the wedge block 3513 is provided with a slide column 3515 which is suitable for penetrating through a slide through hole 3512 on the jacking plate 3511; when the wedge block 3513 pushes into the gap between the limiting block 342 and the side surface of the sliding rail 33, the sliding column 3515 slides horizontally along the sliding through hole 3512, and the wedge block 3513 pushes the limiting block 342 against the outer side of the inclined direction of the wedge block 3513, so as to adjust the distance between the sliding seat 34 and the two sides of the sliding rail 33, and correct the dislocation between the sliding seat 34 and the sliding rail 33. Optionally, the jacking assembly is such as, but not limited to, a hydraulic jack.
Specifically, the specific deviation correcting process of the limiting mechanism 352 is as follows: the limiting mechanism 352 comprises a supporting seat 3521 and is rotatably connected with the middle part of the jacking plate 3511 through a rotating shaft 3522; a reverse L-shaped rod 3523 positioned at the other end of the jacking plate 3511; the other end of the jacking plate 3511 is provided with a mounting through hole 3524; the vertical portion of the reverse l-shaped rod 3523 is adapted to be slidably inserted into the mounting through hole 3524 and locked by a locking member 3525; the horizontal portion of the inverted l-shaped rod 3523 is adapted to extend above the carriage 34; when the wedge 3513 is pushed into the gap between the limiting block 342 and the side of the sliding rail 33, one end of the lifting plate 3511 moves upward, and the other end moves downward with the rotating shaft 3522 as the center, so as to drive the horizontal portion of the reverse rod 3523 to abut against the top of the sliding seat 34, so as to limit the lifting of the sliding seat 34.
The scheme also provides an erection method of the steel truss girder for the bridge based on the structure of the steel truss girder traction frame, as shown in fig. 5-8, which is used for constructing a bridge assembled by a plurality of sections of steel truss girders 1, and comprises the following steps of: step S1, installing a steel truss girder 1 traction frame, namely embedding a traction device 2 at the front end of an installation bridge site, installing a plurality of sliding brackets 3 at intervals at the installation bridge site, and installing a plurality of splicing brackets 4 at the rear end of the installation bridge site; step S2, splicing the steel truss girder 1 in the first stage, namely connecting the front section of the guide girder 5 and the front sections of the plurality of sections of the steel truss girder 1 on a splicing bracket 4 to form a first splicing assembly 11, and arranging a front anchor point 12 of the traction device 2 at the front end of the guide girder 5; step S3, the steel truss girder 1 is dragged and slipped in the first stage, namely, the first assembly component 11 is dragged and slipped onto the slipping bracket 3 by the traction device 2 to vacate the assembly bracket 4; s4, splicing the steel trusses 1 in the second stage, namely splicing the rear chords of the steel trusses 1 on the vacated splicing bracket 4 to form a second splicing assembly 15, and assembling the second splicing assembly 15 with the tail end of the first splicing assembly 11 to form a Quan Qiaogang truss 1 whole; and S5, the steel truss girder 1 is pulled and slipped in the second stage, namely, the whole full-bridge steel truss girder 1 is pulled and slipped circularly to the installation bridge position by using the traction device 2. Wherein the method comprises the steps of
The specific process of installing the steel truss girder 1 traction frame in the step S1 is as follows: referring to fig. 8, the pre-buried traction device 2 at the front end of the bridge site includes a pre-buried traction assembly (such as a piercing jack) at the top of the pier 6, a traction reaction seat 21 and a steel strand assembly 22. The plurality of sliding brackets 3 are arranged at intervals at the mounting bridge position and comprise three-dimensional steel buttresses which are connected through steel pipes and channel steel to form upright posts 31; a plurality of lattice column supports form a connecting system 32 which is connected between the columns 31; a sliding slideway 33 is formed by welding H-shaped steel and a steel pipe and is fixedly arranged at the top of the upright post 31; mounting the slide 34 on the corresponding glide slope 33; and a limit deviation correcting device 35 is arranged at the top of the lattice column bracket. The limiting and correcting device 35 is used for fine adjustment of the posture of the steel truss girder 1 in the horizontal direction and the elevation direction, and the top of the lattice column bracket is provided with the limiting and correcting device 35 which comprises: installing an operating platform 36 on top of the lattice column rack; a supporting seat 3521 is arranged on the operation platform 36, and the middle part of the jacking plate 3511 is arranged on the supporting seat 3521 through a rotating shaft 3522; a wedge block 3513 is slidably mounted at one end of the jacking plate 3511, and the other end of the jacking plate 3511 slides through the vertical portion of the inverted-L-shaped rod 3523, and the horizontal portion of the inverted-L-shaped rod 3523 extends above the slide 34; the vertical part of the inverted L-shaped rod 3523 is locked on the jacking plate 3511 through fastener locking; mounting a jacking assembly 3514 on the operating platform 36 and below one end of the jacking plate 3511; the jacking component 3514 is a hydraulic jack, and a hydraulic one-way valve is further required to be arranged, so that the piston is locked after the jacking component 3514 is jacked in place, the occurrence of falling back is prevented, and meanwhile, an overflow valve is also required to be arranged, so that the pressure of the jacking component 3514 can be reduced when the set pressure is exceeded, and the self safety of jacking components 3514 is ensured. The mounting of a plurality of splicing brackets 4 at the rear end of the mounting bridge position comprises the steps of connecting a plurality of steel pipes into a three-dimensional frame structure to form a cross frame 42; a bolster is arranged at the top of the cross frame 42 to form an assembly platform 43; the assembling platform 43 is welded by H-shaped steel and steel pipes to form the assembling slide way 41.
In addition, the installation steel truss girder 1 traction frame further comprises a construction installation platform, the construction installation platform comprises a plurality of lattice column structures for connecting the sliding support 3 and the assembling support 4 into a whole to form a sliding jig frame, and transverse bridges are arranged on the sliding support 3 and the assembling support 4 to form the installation platform, so that workers can conveniently construct and maintain and set corresponding devices.
Referring to fig. 5, the specific process of the first stage assembly of the steel truss girder 1 in step S2 is as follows: the method of hoisting and assembling is adopted, namely, the lower chord of the front section of the steel truss girder 1 is assembled in advance and the bolting inspection of the node bolts is completed; lifting the lower chord of the front section of the steel truss girder 1 and the front section of the guide girder 5 to an assembly platform 43 by a double crane, and then assembling and splicing the upper chord of the front section of the steel truss girder 1 on the assembly platform 43; and welding the front section of the steel truss girder 1 and the front section of the guide girder 5 into a whole. The main chord members are welded with box sections, other diagonal members of the main chord members are welded with I-shaped sections, and the chord members are connected through high-strength bolts.
The specific process of the first stage of dragging and sliding of the steel truss girder 1 in the step S3 is as follows: the rear anchor point 13 of the traction device 2 is arranged at the bottom of the lower chord of the front section of the steel truss girder 1, a support hole 14 is reserved, the rear anchor point 13 is connected with the lower chord bolt of the front section of the steel truss girder 1, a steel strand passes through the rear anchor point 13, a traction assembly and a traction counterforce seat 21 are started, and the front section of the steel truss girder 1 and the front section of the guide girder 5 are pulled to advance along a splicing slideway; according to the designed sliding slideway 33 length, the segment length of one steel truss girder 1 is dragged to leave an assembling bracket 4 out; the jacking component 3514 is started, the wedge block 3513 is jacked into a gap between the limiting block 342 and the side face of the sliding slideway 33, so that horizontal displacement is generated between the sliding seat 34 and the sliding slideway 33, and the pressure maintaining sliding seat 34 is not separated from the sliding slideway 33, so that the relative position of the front section of the steel truss girder 1 and the sliding slideway 33 is adjusted. Referring to fig. 6, the specific process of the second stage assembly of the steel truss girder 1 in step S4 is as follows: the hoisting assembly mode is adopted, namely, the lower chord of the rear section of the steel truss girder 1 is assembled in advance; lifting the lower chord of the rear section of the rear steel truss girder 1 to an unoccupied assembly bracket 4 by a crane, and then assembling the upper chord of the rear section of the steel truss girder 1 with the lower chord of the rear section of the steel truss girder 1 on the unoccupied assembly bracket 4 to form the rear section of the steel truss girder 1; the rear section of the steel truss girder 1 is connected with the front section of the steel truss girder 1 through high-strength bolts to form a whole steel truss girder 1; the jacking component 3514 is started, the wedge block 3513 is jacked into a gap between the limiting block 342 and the side face of the sliding slideway 33, so that horizontal displacement is generated between the sliding seat 34 and the sliding slideway 33, and the pressure maintaining sliding seat 34 is not separated from the sliding slideway 33, so that the relative position of the whole steel truss girder 1 and the sliding slideway 33 is adjusted.
Referring to fig. 7, the specific process of the second stage pulling and sliding of the steel truss girder 1 in step S5 is similar to the specific process of the first stage pulling and sliding of the steel truss girder 1 in step S3, and will not be described again.
In summary, the method for erecting the steel truss 1 tractor and the steel truss 1 for the bridge comprises the steps of arranging the splicing brackets 4 at the front end of the bridge position, limiting and facilitating splicing of the front section of the steel truss 1 in the splicing site, arranging the sliding slide ways 33 on each sliding bracket 3 for sliding the front section of the steel truss 1, freeing the splicing brackets 4 for continuing splicing of the rear section of the steel truss 1, connecting the front section of the steel truss 1 and the rear section of the steel truss 1 into the whole steel truss 1, and adjusting the deviation direction of the front section of the steel truss 1 or the whole steel truss 1 by combining the limiting and deviation correcting devices 35 on the sliding slide ways 33. The erection construction of the integral bridge is completed by the mode of split erection and split dragging, the steel truss girder 1 dragging frame has a simple structure, is convenient to build, can effectively solve the troublesome problem that the steel truss girder 1 cannot be integrally assembled when the length of a construction site is limited, and can not influence the normal operation of the existing channel in the integral construction process; the mode of discontinuous assembly and sliding dragging can also reduce the investment of the whole bracket to the greatest extent, and meanwhile, the shipping is not blocked.
In the description of embodiments of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (6)
1. The steel truss girder traction frame is used for construction of a bridge assembled by a plurality of sections of steel truss girders and is characterized by comprising a traction device which is positioned at the front end of an installation bridge position; the sliding brackets are positioned at the installation bridge positions and are arranged at intervals along the arrangement direction of the large bridge frame; the splicing brackets are positioned at the rear end of the installation bridge position and are arranged at intervals along the direction of the large bridge frame; wherein the spliced bracket is used for bearing the steel truss girder; the traction device is suitable for pulling the steel truss girder to move to the installation bridge position along the sliding bracket, and the sliding bracket comprises a plurality of upright posts; the connecting system consists of a plurality of lattice column supports and is used for connecting the upright posts; the sliding slideway is fixed at the top of the upright post; the sliding seats are used for bearing the steel truss girder; the traction device is suitable for driving the sliding seat to slide along the slideway so as to move the steel truss girder;
the upright posts are suitable for being arranged into two rows along the arrangement direction of the large bridge so as to form two sliding slide ways which are arranged at intervals; the sliding seat is correspondingly matched with the sliding slideway; the sliding support further comprises an operation platform positioned at the top of the connecting system and four limit deviation correcting devices positioned on the operation platform, and the limit deviation correcting devices are distributed on two sides of each row of upright posts and used for correcting the corresponding matched sliding seat on the sliding slideway; the limit deviation correcting device comprises a deviation correcting mechanism and a limit mechanism matched with the deviation correcting mechanism; the deviation correcting mechanism is suitable for driving the sliding seat and the sliding slideway to generate horizontal displacement; the limiting mechanism is suitable for limiting vertical displacement between the sliding seat and the sliding slideway; the deviation correcting mechanism comprises a horizontally arranged jacking plate; the wedge-shaped block is slidably arranged on the upper surface of one end of the jacking plate; the jacking component is positioned below one end of the jacking plate; the jacking assembly is suitable for driving one end of the jacking plate to move upwards so as to jack the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway; a sliding through hole is formed in one end of the jacking plate; the bottom of the wedge block is provided with a sliding column which is suitable for penetrating through the sliding through hole; when the wedge block is jacked into a gap between the limiting block and the side surface of the sliding slideway, the sliding column horizontally slides along the sliding through hole, and the limiting mechanism comprises a supporting seat and is rotationally connected with the middle part of the jacking plate through a rotating shaft; a L-shaped rod or a L-shaped rod is positioned at the other end of the jacking plate; the other end of the jacking plate is provided with a mounting through hole; the vertical part of the L-shaped rod or the L-shaped rod is suitable for being inserted into the mounting through hole in a sliding way and locked by a locking piece; the horizontal part of the L-shaped rod or the inverted L-shaped rod is suitable for extending to the upper part of the sliding seat; when the wedge block is jacked into the gap between the limiting block and the side face of the sliding slideway, one end of the jacking plate moves upwards, and the other end of the jacking plate moves downwards by taking the rotating shaft as the center, so that the horizontal part of the L-shaped rod or the L-shaped rod is driven to abut against the top of the sliding seat, and the sliding seat is limited to be lifted.
2. The steel truss work frame of claim 1 wherein the splice bracket comprises a derrick; the assembly platform is arranged on the well frame; the assembling slide way is paved at the top of the well frame and is used for bearing the steel truss girder; wherein the cross frame is a three-dimensional frame structure formed by connecting a plurality of steel pipes; and the assembly platform is horizontally arranged on the three-dimensional frame structure.
3. The erection method of the steel truss girder is used for construction of a bridge assembled by a plurality of sections of steel truss girders and is characterized by comprising the following steps:
installing a steel truss girder traction frame, namely embedding a traction device at the front end of an installation bridge position, installing a plurality of sliding brackets at intervals at the installation bridge position, and installing a plurality of spliced brackets at the rear end of the installation bridge position;
the front end pre-buried traction device at the installation bridge position comprises a pre-buried traction assembly, a traction counterforce seat and a steel strand assembly at the top of the bridge pier;
the method comprises the steps that a plurality of sliding brackets are installed at intervals at the installation bridge position and comprise three-dimensional steel buttresses which are formed by connecting steel pipes and channel steel, so as to form upright columns; a plurality of lattice column supports form a connecting system which is connected between the upright posts; a sliding slideway is formed by welding H-shaped steel and a steel pipe and is fixedly arranged at the top of the upright post; the sliding seat is arranged on the corresponding sliding slideway; a limit deviation correcting device is arranged at the top of the latticed cylindrical support;
the top installation limiting deviation correcting device at lattice column support includes: an operation platform is arranged at the top of the latticed cylindrical support; a supporting seat is arranged on the operation platform, and the middle part of the jacking plate is arranged on the supporting seat through a rotating shaft; a wedge block is slidably arranged at one end of the jacking plate, the other end of the jacking plate slidably passes through the vertical part of the L-shaped rod or the L-shaped reverse rod, and the horizontal part of the L-shaped rod or the L-shaped reverse rod extends to the upper part of the sliding seat; the vertical part of the L-shaped rod or the L-shaped rod is locked on the jacking plate through the locking of the fastener; installing a jacking assembly on the operation platform and enabling the jacking assembly to be positioned below one end of the jacking plate;
the mounting of a plurality of spliced brackets at the rear end of the mounting bridge position comprises the steps of connecting a plurality of steel pipes into a three-dimensional frame structure to form a cross frame; a bolster is arranged at the top of the cross frame to form an assembly platform; an assembling slideway is welded by adopting H-shaped steel and steel pipes on an assembling platform;
the steel truss girder tractor frame also comprises a construction and installation platform, wherein the construction and installation platform comprises a sliding bracket and an assembling bracket which are connected into a whole through a plurality of lattice column structures, forming a sliding jig frame, and arranging transverse bridges on the sliding bracket and the assembling bracket to form the mounting platform;
the first stage of assembling of the steel truss girder, namely connecting the front section of the guide girder and the front sections of the steel truss girders on an assembling bracket to form a first assembling component, and arranging a front anchor point of a traction device at the front end of the guide girder;
the first stage of dragging and sliding of the steel truss girder, namely dragging and sliding the first assembly component to the sliding bracket by utilizing a traction device to vacate the assembly bracket;
assembling the steel truss in the second stage, namely assembling a plurality of steel truss rear section chords on the vacated assembling bracket to form a second assembling component, and assembling the second assembling component with the tail end of the first assembling component to form a complete bridge steel truss whole;
and in the second stage of dragging and sliding of the steel truss girder, the whole full-bridge steel truss girder is circularly dragged to the installation bridge position by utilizing the dragging device.
4. A method of erecting a steel truss girder according to claim 3, wherein the first stage assembly of the steel truss girder comprises: the method of hoisting and assembling is adopted, namely, the lower chord of the front section of the steel truss girder is assembled in advance and the bolting inspection of the node bolts is completed; lifting the lower chord of the front section of the steel truss girder and the front section of the guide girder to an assembly platform by a double crane, and then assembling the upper chord of the front section of the steel truss girder on the assembly platform; and welding the steel truss girder front section and the guide girder front section into a whole.
5. The method of erecting a steel truss girder according to claim 4, wherein the first stage pull slip of the steel truss girder comprises: the method comprises the steps of setting a rear anchor point of a traction device at the bottom of a lower chord of a front section of a steel truss girder and reserving a support hole, connecting the rear anchor point with a lower chord bolt of the front section of the steel truss girder, enabling a steel strand to pass through the rear anchor point, starting a traction assembly and a traction counterforce seat, and leading the front section of the steel truss girder and the front section of the guide girder to advance along a spliced slideway; according to the designed sliding slideway length, the segment length of one steel truss girder is pulled to leave an assembly bracket out; and opening the jacking assembly, jacking the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway, and the sliding seat is ensured not to be separated from the sliding slideway, so that the relative position of the front section of the steel truss girder and the sliding slideway is adjusted.
6. The method of erecting a steel truss girder according to claim 5, wherein the second stage assembly of the steel truss girder comprises: the method adopts a hoisting assembly mode, namely, the lower chord of the rear section of the steel truss girder is assembled in advance; lifting the lower chord of the rear steel truss girder rear section to an unoccupied spliced bracket by a crane, and then assembling the upper chord of the rear steel truss girder section with the lower chord of the rear steel truss girder section on the unoccupied spliced bracket to form the rear steel truss girder section; the rear section of the steel truss girder is connected with the front section of the steel truss girder through high-strength bolts to form a whole steel truss girder; and opening the jacking assembly, jacking the wedge block into a gap between the limiting block and the side surface of the sliding slideway, so that horizontal displacement is generated between the sliding seat and the sliding slideway, and the sliding seat is ensured not to be separated from the sliding slideway, so that the relative position of the whole steel truss girder and the sliding slideway is adjusted.
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