CN115467248A - Overhead construction method of low-clearance small-curve single-guide-beam bridge girder erection machine - Google Patents
Overhead construction method of low-clearance small-curve single-guide-beam bridge girder erection machine Download PDFInfo
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- CN115467248A CN115467248A CN202211150467.5A CN202211150467A CN115467248A CN 115467248 A CN115467248 A CN 115467248A CN 202211150467 A CN202211150467 A CN 202211150467A CN 115467248 A CN115467248 A CN 115467248A
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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
- E01D21/105—Balanced 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
Abstract
The invention discloses a low-clearance and small-curve overhead construction method for a single-nose-girder bridge girder erection machine, which adopts the single-nose-girder bridge girder erection machine to erect precast girders; the construction method comprises the following steps: the bridge girder erection machine is assembled and then conveyed to the bridge head position of the precast beam to be erected; performing hole passing operation on the bridge girder erection machine; the method comprises the steps of supporting a first column on a front abutment and supporting a second column on a bridge floor close to the abutment; in the bridge girder erection machine via hole operation, the first column is arranged on the first column transverse moving track, and the second column is directly placed on a bridge deck; beam feeding operation; beam falling operation; and (5) carrying out alignment operation on the precast beam bodies to sequentially complete erection of the precast beams. The construction process is optimized and adjusted, so that the method can be well suitable for the beam erecting construction operation of the high-speed intercommunication ramp with the clearance below 6.29m, can be suitable for the normal construction operation when the curve radius of the beam erecting is small, and can effectively ensure the safety in the construction operation process.
Description
Technical Field
The invention belongs to the technical field of road and bridge construction, and particularly relates to a low-clearance and small-curve single-nose-girder bridge girder erection machine overhead construction method.
Background
The junction intercommunication is commonly used for traffic conversion with high speed, and a certain high speed intercommunication project is integrally arranged into a symmetrical double-ring type semi-clover leaf cross junction intercommunication structure. The design of the intercommunicating main line and the ramp comprises a plurality of high-speed existing bridges which pass through downwards, wherein the height of the minimum clearance between the ramp and the existing bridges is only 6.29m, and the construction is difficult to carry out by adopting a conventional bridge erecting machine due to the limitation of the clearance height. In addition, the problem of small radius of ramp curve exists in the design of the construction ramp, the radius of the ramp curve is only 125m, and the construction difficulty of the ramp bridge is further increased.
Disclosure of Invention
The invention aims to provide a low-clearance and small-curve single-guide-beam bridge girder erection overhead construction method, which solves the problems in low-clearance and small-curve loop construction in high-speed intercommunication construction.
The invention is realized by the following technical scheme:
the overhead construction method of the low-clearance small-curve single-guide-beam bridge girder erection machine is characterized in that the single-guide-beam bridge girder erection machine is used for erecting precast girders and comprises a machine arm, a curved beam, a zero column, a first column, a second column, a third column, a hanging beam travelling crane, a first column transverse moving track and a second column transverse moving track, wherein the curved beam comprises a front curved beam and a rear curved beam, and the hanging beam travelling crane comprises a front hanging beam travelling crane and a rear hanging beam travelling crane;
the construction method comprises the following steps:
transporting the assembled bridge girder erection machine to the bridge head position of a precast beam to be erected;
carrying out hole passing operation on a bridge girder erection machine; the method comprises the steps of supporting a first column on a front pier, and supporting a second column on a bridge floor close to the pier; in the bridge girder erection machine via hole operation, the first column is arranged on the first column transverse moving track, and the second column is directly placed on a bridge deck;
beam feeding operation; horizontally overturning a third column, overturning the third column to the rear, transporting a precast beam to be erected to the rear position of the second column, hoisting the precast beam by a front hoisting beam crane, hoisting a movable tray on a track beam transporting vehicle along with the precast beam when hoisting the precast beam, synchronously feeding the beam by a rear track beam transporting vehicle and a front hoisting beam crane, and hoisting the precast beam by a rear hoisting beam crane when the other end of the precast beam moves to the rear hoisting beam crane position;
beam falling operation; when the beam is dropped, the prefabricated T beam is temporarily placed on the erection position of the middle beam, then the second column is placed on the second column transverse rail, the first column and the second column respectively transversely move on the first column transverse rail and the second column transverse rail, so that the whole bridge girder erection machine can transversely move to the beam dropping position, the prefabricated beam is hoisted again, and the prefabricated beam is dropped after transversely moving to the erection position;
and (5) carrying out alignment operation on the precast beam bodies to sequentially complete erection of the precast beams.
In another aspect, in the construction method of the invention, the operation of passing the hole by the bridge girder erection machine comprises the following steps:
a. respectively connecting a front hanging beam travelling crane and a rear hanging beam travelling crane with a front curved beam and a rear curved beam, removing the connection between the curved beams and the machine arm, and well supporting a first column on an abutment close to a bridge deck;
b. lifting the third column and driving the machine arm to move forwards;
c. supporting a third column, collecting the second column to enable the second column to transversely move the track to the ground, driving the second column to move forwards to a position which is away from the center of the first column by a certain distance, supporting the second column stably, and collecting the third column;
d. the crane beam crane drives the jib to move forwards, so that the zero column moves to the front pier position, and the zero column is lifted up, so that the height difference between the front end of the jib and the first column is-50-150 mm;
e. lifting the third column to enable the rear end of the machine arm to be 0-100 mm higher than the first column, collecting the second column, driving the second column to move the second column to the position of the frame beam, and directly stabilizing the second column on the bridge floor close to the abutment;
f. receive a post, drive a post motion with a post removal the place ahead pier stud beam position, prop up a post on a post sideslip track and on the pier of the place ahead steady.
On the other hand, in the construction method, the levelness of the machine arm is adjusted in the process of the hole passing operation of the bridge girder erection machine, so that the levelness of the machine arm is not more than 0.5 percent all the time; when the zero column and the first column are supported, the verticality of the zero column and the first column is adjusted to be not more than 0.5 percent all the time.
On the other hand, in the construction method, in the bridging construction of the small-radius curve ramp, when the first column and the second column are arranged in the hole passing operation of the bridging machine, an included angle of 3-5 degrees is formed between the first column and the second column and the center line of the bent cap corresponding to the abutment.
On the other hand, in the construction method, the capping beam of each pier abutment is arranged to be of a fan-shaped structure, so that the included angle of 3-5 degrees is formed between the center line of the capping beam and the end face of the precast beam.
On the other hand, in the construction method, in the beam feeding operation step, the front hanging beam crane lifts the precast beam, the inclination angle of the precast beam is kept not more than 20 degrees, the front axle beam crane and the rear track beam transporting vehicle synchronously advance, and the transverse movement of the whole machine is synchronously adjusted in the advancing process to adjust the position of the precast beam;
when the rear track beam transporting vehicle reaches the rear hanging beam traveling vehicle to play a position, the rear hanging beam traveling vehicle lifts the precast beam to enable the precast beam to be in a horizontal state, the hanging beam travels forwards while the hanging beam travels, and the column II is transversely adjusted in the traveling process to enable the precast beam to smoothly pass through the column II.
On the other hand, in the construction method, the perpendicularity of the first column is guaranteed to be not more than 0.5% all the time in the process of adjusting the transverse movement of the whole machine, and when the first column is inclined, the longitudinal moving oil cylinder above the first column curved beam is adjusted in time to adjust the perpendicularity of the first column.
On the other hand, in the construction method, in the bridging construction of the small-radius curve ramp, the bridging beams sequentially comprise the inner edge beam, the secondary inner edge beam, the outer edge beam, the secondary outer edge beam and the middle beam, and the bridging operation of the one-hole bridge is completed sequentially.
On the other hand, in the construction method, in the beam falling operation, when the inner edge beam is erected, the central points of the first column and the second column on the corresponding transverse moving tracks do not exceed the corresponding abutment capping beam stop blocks and the outermost edge of the bridge floor; in the beam falling process, the first column transverse moving rail and the second column transverse moving rail are transversely moved in place, transverse moving rail wheels of the first column and the second column are locked, and then the hoisted precast beam is adjusted to the beam erecting position through adjusting the curved beam transverse moving oil cylinder and then falls.
On the other hand, in the construction method, in the beam falling operation, when the outer edge beam is erected, the first column transverse rail wheel is moved to the most edge of the cover beam, then the precast beam close to one end of the first column is temporarily fallen on the support base cushion corresponding to the abutment, a transverse rail is arranged on the abutment close to the bridge floor, the precast beam close to one end of the second column is fallen on the transverse rail, and then the precast beam is pushed and transversely moved to the beam erecting position to fall the beam.
The construction process is optimized and adjusted, the structure of the bridge girder erection machine is optimized on the basis of the existing single-guide-beam bridge girder erection machine, the influence of the low-clearance construction height on the construction operation of the bridge girder erection machine in each of the through holes, the beam feeding and the beam falling is well solved, the bridge girder erection machine is well suitable for the construction operation of the bridge girder erection of the high-speed intercommunication ramp with the clearance below 6.29m, and the normal construction of the normal through hole, beam feeding and beam falling operation of the bridge girder erection machine is ensured.
The construction process disclosed by the invention can be suitable for the girder erection construction of the low-clearance high-speed intercommunicating ramp, and meanwhile, the problem that the girder erection construction of the bridge girder erection machine is difficult due to the small curve radius of the intercommunicating ramp is solved by adjusting the setting position and the construction steps when the bridge girder erection machine falls off the girder, so that the construction process can be suitable for the normal construction operation when the curve radius of the girder erection machine is small, and the safety in the construction operation process can be effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a bridging construction structure of the single-nose-beam bridge girder erection machine in the construction method of the invention.
FIG. 2 is a schematic view of step a in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
FIG. 3 is a schematic diagram of step b in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
FIG. 4 is a schematic diagram of step c in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
FIG. 5 is a schematic view of step d in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
FIG. 6 is a schematic view of step e in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
FIG. 7 is a schematic view of step f in the operation of the bridge girder erection machine via hole according to the construction method of the invention.
Fig. 8 is a sequence view illustrating the erection of the prefabricated beam in the construction method according to the present invention.
FIG. 9 is a schematic view of the bridge girder erection machine in position during the hole passing operation of the small curve frame bridge girder erection machine in the construction method of the invention.
FIG. 10 is a schematic view of the front suspension beam crane lifting in the small curve frame beam feeding operation of the construction method of the present invention.
FIG. 11 is a schematic view of the rear suspension beam crane lifting in the small curve girder erection feeding operation of the construction method of the present invention.
Fig. 12 is a schematic view of an inner edge beam falling structure in the small curve frame beam falling operation in the construction method of the present invention.
Fig. 13 is a schematic view of the structure of the outer edge beam falling in the operation of the small-curve girder erection falling in the construction method of the invention.
FIG. 14 is a schematic diagram of the construction method of the present invention.
FIG. 15 is a schematic view of a roller arrangement structure in a traversing rail according to the construction method of the present invention.
Fig. 16 is a schematic view of a structure of the prefabricated T-beam erected on the abutment in the construction method of the present invention.
Wherein:
11. the machine arm comprises a machine arm body 12, a zero column 13, a first column 14, a second column 15, a third column 16, a front curved beam 17 and a rear curved beam;
21. pier, 22, front pier, 23, prefabricated T beam, 231, inner edge beam, 232, secondary inner edge beam, 233, middle beam, 234, secondary outer edge beam, 235, outer edge beam, 24, support, 25, support cushion stone, 26, capping beam;
31. 32 steel rails, 33 rolling rows and sliding plates;
41. front track fortune roof beam car, 42, rear track fortune roof beam car.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Aiming at the problems of project engineering characteristics and limited construction space, the DJ180 bridge girder erection machine is adopted for construction in the embodiment, the bridge girder erection machine is of a single-arm simple support type, can realize full-width mechanical transverse girder piece, can fall the girder in place once, and has the characteristics of simple structure and the like.
Referring to fig. 1, the bridge girder erection machine comprises an arm assembly, a curved beam and transverse moving mechanism, a zero column 12, a first column 13, a second column 14, a third column 15, a first column transverse moving track, a second column transverse moving track, a hanging beam travelling crane, an electric hydraulic control system for controlling the movement of each part and the like.
The machine arm assembly comprises a machine arm 11 which is a main bearing structural part of the bridge girder erection machine; it adopts a box-shaped section, and upper and lower ear beams are arranged on two sides of the section; the lower part is provided with a rack, and the machine arm is generally formed by assembling and connecting five sections of unit beams by using pin shafts.
The curved beam and the curved beam in the transverse moving mechanism are main components for supporting and driving the machine arm and comprise a front curved beam 16 and a rear curved beam 17, wherein the front curved beam and the rear curved beam are respectively arranged on the upper cross beams of a first column and a second column and are connected with the machine arm through a balancing wheel set. One end of the transverse moving mechanism is connected to the upper part of the curved beam through a bolt, and the other end of the transverse moving mechanism is bolted to the upper cross beam of the first column and the second column respectively. The connecting directions of the transverse moving mechanisms of the front curved beam and the rear curved beam are the same, the moving amounts of the transverse moving mechanisms in the left and right directions can reach 750mm respectively, and the first column and the second column are driven to transversely move on the first column transverse moving track and the second column transverse moving track.
When the curve beam feeding operation is carried out, the transverse oil cylinder on the curved beam at the second column position needs to be independently adjusted, and collision between a prefabricated T-shaped beam piece and a second column body is prevented; however, the first column is deflected, and therefore, the longitudinal adjusting cylinder at the first column needs to be adjusted to adjust the first column to be vertical.
The zero number column is arranged at the front end of the arm and adopts a two-stage telescopic narrow door frame structure; the turnover mechanism can realize turnover in the horizontal direction, and the zero column can be conveniently turned to the horizontal position during transfer.
The first column is connected with the front curved beam through an upper cross beam of the first column; the shaft of a first column adopts two-stage telescopic columns, the adjusting height of the first column is 3000mm, and two adjusting joints are usually configured on a conventional structure: one is 3400mm and is used for erecting a flat bridge; one is 1100mm and is used for erecting a downhill bridge. The first column is arranged on the first column transverse moving track, and the traveling mechanism is arranged on the first column, so that the first column can transversely move on the first column transverse moving track at a transverse moving speed of 1.6m/min.
The second column is connected with the rear curved beam through an upper cross beam of the second column; the column body of the second column adopts four two-stage telescopic columns, and the height is adjusted to 3000m; the second column is arranged on the second column transverse moving track, and the travelling mechanism is also arranged on the second column, so that the second column can transversely move on the second column transverse moving track at the transverse moving speed of 1.6m/min, and the number of the second column transverse moving tracks is two.
The third column is arranged at the rear end of the machine arm and is connected with the machine arm through a frame-shaped connecting bracket; the column body of the third column adopts two-stage telescopic columns, the adjusting height is 3150m, a 400mm adjusting joint is arranged in a conventional structure, and the adjusting joint can be used when an uphill bridge is erected. In order to meet the requirement of small curve beam feeding operation, the third column and the machine arm are connected in a turnover mode to have a backward turnover function, and an oil cylinder is arranged between the machine arm and the third column to provide power for turnover of the third column.
The hanging beam travelling crane can be divided into a front hanging beam travelling crane and a rear hanging beam travelling crane according to the arrangement position on the machine arm, and the front hanging beam travelling crane and the rear hanging beam travelling crane are hung on an ear beam below the machine arm through a wheel set. The walking running speed of the lifting beam travelling crane on the machine arm is 5m/min, the lifting speed of the lifting beam travelling crane is 0.6m/min, and each electric winch is provided with a 7.5kw brake motor and an electromagnetic brake to realize bipolar braking.
The overhead construction method for erecting the beam by adopting the single-guide-beam bridge erecting machine generally comprises the following steps: loading and transporting beams, feeding beams, dropping beams and transversely moving.
The height of the conventional common bridge girder erection machine is generally 9.8m-10.5m, and the requirement of low-clearance construction working conditions in the construction project cannot be met; the overall height of the existing DJ180 type highway-railway dual-purpose bridge girder erection machine during operation is 8.8m and is larger than the minimum clearance height (6.29 m) of the construction of the project, so the structure of the single-guide-beam bridge girder erection machine needs to be further optimized to meet the requirement of low clearance construction.
1) Bridge girder erection machine structure optimization and via hole operation
Firstly, optimizing the height of a first column adjusting joint of a bridge girder erection machine, and improving the original adjusting joint with the design size of 3.4m into a combined structure of 2.8m + 0.65m; when the lower through groove type beam is used for erecting the beam, only 2.8m of adjusting joints are adopted, and the first column and the second column can be simultaneously reduced by 1.5m when the beam is erected, so that the requirement of reducing the height of the whole machine is met.
Should control the via hole operation in-process horn levelness and the cylinder straightness that hangs down in the operation of bridging machine via hole, the via hole operation process of bridging machine includes:
a. connecting a front hanging beam travelling crane and a rear hanging beam travelling crane with a front curved beam through pin shaft and a rear curved beam through pin shaft, respectively connecting the front end of the hanging beam travelling crane with the rear end of the curved beam through pin shaft, simultaneously removing the connection between the curved beam and a machine arm, and fixing a first column on an abutment 21 as shown in figure 2;
b. lifting the third column and driving the machine arm to move forwards, as shown in figure 3;
c. supporting a third column, keeping the machine arm horizontal, and collecting a second column to enable the second column to transversely move the track to the ground; driving the second column to move forward to a position 16.4m away from the center of the first column, as shown in FIG. 4; supporting and stabilizing the second column, and collecting the third column;
d. the front and rear suspension beam traveling crane drives the horn to move forward for 15m, so that the zero column moves to the predetermined position of the front abutment 22, as shown in fig. 5; jacking the zero column to ensure that the height difference between the front end of the arm and the first column is-50-150 mm, and adjusting the verticality of the zero column to be less than or equal to 5 per thousand;
e. lifting the third column to enable the rear end of the machine arm to be 0-100 mm higher than the first column, collecting the second column, moving the second column forward by 13.6m to the position of the frame beam, and then descending the second column to be stably supported, as shown in figure 6;
f. collecting a first column, driving the first column to move forward for 30m, moving to the front pier frame beam position, connecting the bent beam with the machine arm, filling the bent beam with stable support, and penetrating a column pin shaft as shown in fig. 7;
g. the connection between the curved beam and the hanging beam travelling crane is released, and the zero-withdrawing column ensures that the bottom is higher than a first column travelling motor; and the lifting beam traveling crane retreats to the tail part of the machine arm to prepare for beam erecting operation.
When the bridge girder erection machine operates at the low clearance via hole, the height of the bridge girder erection machine is adjusted, the stroke of the second column oil cylinder is reduced by 1.3m, at the moment, the height of the whole bridge girder erection machine can reach 6.0m, the via hole of the bridge girder erection machine is realized, and the requirement of low clearance bridge girder erection is met.
After the bridge girder erection machine passes through the hole, the height size of the second column cannot meet the size requirement of beam feeding operation; the height of a prefabricated T-shaped beam is 2.5m, the height of a beam transporting trolley is 0.65m, the total height of the prefabricated T-shaped beam is required to be 3.2m, the mounting height required by a hanging beam steel wire rope and other skids is further considered to be 40cm, so that the steel wire rope can be conveniently dismounted and hung, and the feeding beam clearance height space required by a second column for the prefabricated T-shaped beam feeding operation is required to be more than 3.6 m; therefore, the clearance height of the second column feeding beam needs to be adjusted after the bridge girder erection machine passes through the hole, and the requirement of the clearance height of the feeding beam cannot be met if the second column of the bridge girder erection machine is arranged on the second column transverse moving track (the height of the second column transverse moving track is 39 cm) due to the limited clearance height.
Therefore, in the actual operation process, the second column is directly placed on the bridge floor after the bridge girder erection machine passes through the hole, the wood wedge and the sleeper support are used for fixing, the stroke of the second column oil cylinder is adjusted to the maximum, the feeding beam clearance is met for 3.6m, and the feeding beam operation is realized.
2) Loading and transporting beam
The beam transporting of the prefabricated T-shaped beam 23 adopts a four-axis rail beam transporting vehicle which comprises a front rail beam transporting vehicle 41 and a rear rail beam transporting vehicle 42, two ends of the prefabricated T-shaped beam respectively fall on movable trays of the two rail beam transporting vehicles during beam transporting, and the prefabricated T-shaped beam can rotate relative to the rail beam transporting vehicles on the rail beam transporting vehicles when the beam is transported. Transporting the prefabricated T-beam to the position 100m from the front end of a bridge girder erection machine, arranging double rows of lifting beam door frames at the position 100m from the front of the bridge girder erection machine, laying a track at the position 50m close to the bridge girder erection machine, and arranging a track girder transporting vehicle above the track; the rail beam transporting vehicle also needs to meet the requirement of reducing the beam feeding height of the bridge girder erection machine in the beam erection construction, and two rail beam transporting vehicles are usually adopted, and the height of each rail beam transporting vehicle is 0.65m.
When the prefabricated T beam is transported to the position below the lifting beam portal frame during beam loading and transporting operation, the prefabricated T beam is lifted to the rail beam transporting vehicle by the lifting beam portal frame, the center of gravity of the prefabricated T beam is required to fall on the longitudinal central line of the rail beam transporting vehicle, and the deviation is not more than 20mm; when the prefabricated T-beam falls on the rail beam transporting vehicle, the front end of the prefabricated T-beam does not exceed the supporting cross beam of the rail beam transporting vehicle by 2.5m, hard miscellaneous wood or a rubber belt is laid at the upper end of an inclined support of the rail beam transporting vehicle to be in perfect contact with a beam piece, and the inclined support is supported and locked to protect the concrete of the beam piece; before beam transportation, the steel wire ropes of the binding beam pieces are tensioned and locked, and rubber linings are used for the contact points of the steel wire ropes and the beam pieces to protect beam body concrete and the steel wire ropes of the binding beam to be intact, so that the safe transportation of the prefabricated T-beam is ensured.
3) Feed beam
And when the other end of the prefabricated T beam moves to the rear hanging beam travelling position, the rear hanging beam travelling crane lifts the prefabricated T beam, and synchronous beam feeding is realized.
When the beam feeding operation is performed, because the machine arm is in a horizontal state, the bridge has a certain gradient in the erection process of the junction intercommunication, and at the moment, in the beam feeding operation process, the distance between the bottom surface of the beam piece of the prefabricated T-shaped beam and the top surface of the rail beam transporting vehicle is gradually reduced; in order to ensure the smooth operation of beam feeding, when the front lifting beam crane lifts the prefabricated T-beam piece, the movable tray on the track beam transporting vehicle is lifted along with the prefabricated T-beam, so that the height of the track beam transporting vehicle in front is reduced, the requirement that the bottom of the prefabricated T-beam can smoothly pass through the track beam transporting vehicle without interference with the track beam transporting vehicle when an uphill bridge is erected is met, and the construction requirement of low clearance is met.
4) Beam falling
In the erection operation of the prefabricated T-beam 23, taking 5 prefabricated T-beams erected in one span as an example, the erection sequence of the prefabricated T-beams is as follows: the inner edge beam 231, the secondary inner edge beam 232, the outer edge beam 235, the secondary outer edge beam 234, and the center beam 233 are shown in FIG. 8.
When the beam operation falls, because No. two post feed roof beam sizes receive clearance height's restriction, when erectting prefabricated T roof beam, need place the erection position of well roof beam temporarily with prefabricated T roof beam earlier, the bridge girder erection machine realizes the idle load after the roof beam falls in this position department.
Then, lifting the height of the first column, contracting the second column, and putting the second column on the second column transverse moving track again; the height of the bridge girder erection machine is adjusted, and the height of the whole bridge girder erection machine is not more than 6.2m. After the No. 2 column transverse rail is installed, transverse movement operation is carried out on the whole machine, the whole machine is transversely moved to a beam falling position, the prefabricated T beam is hoisted again, and the prefabricated T beam is transversely moved to an erection position; and the beam falling and the alignment operation are sequentially realized, and the erection of the prefabricated T beam is completed.
5) Beam body in place
When the bridge girder erection machine falls to a position quickly, a rubber support is installed, a hammerhead is aligned with a cross line of a cushion stone to align the prefabricated T girder according to a central line of a support plate led out from the end head of the prefabricated T girder, when the alignment of the longitudinal central line of the prefabricated T girder and the alignment of the end line conflict, the central line of the support is used as the standard, and the rubber support is tightly attached to a girder bottom steel plate after the girder falls.
After the whole span of the prefabricated T-shaped beam is in place, all wet joints of the beam body are welded to be transversely connected with reinforcing steel bars, and the safety and stability of subsequent hole passing and beam transporting operations are guaranteed.
In the high-speed hub intercommunication of the project, the radius of a ramp bridge is 125m, the radius of a ramp curve is smaller, and when an outer edge beam is erected, a bridge girder erection machine cannot transversely move a prefabricated T beam in place; in the construction scheme, the single-guide-beam bridge girder erection machine is adopted for falling the girder, when the outer girder is erected, in order to ensure the safety of the whole bridge girder erection machine and prevent the bridge girder erection machine from overturning, one end of the outer girder is in place on a pier, the other end of the outer girder is fallen on a transverse rail sliding plate, then the construction mode that the jack is used for transversely moving the other end of the outer girder in place is adopted for erecting the outer girder, and prefabricated T girders at other positions can be erected and constructed by adopting the single-guide-beam bridge girder erection machine according to normal construction operation.
Specifically, in this embodiment, for the construction condition with a small radius of the high-speed intercommunication ramp, the adopted construction scheme is as follows:
1) Operation of bridge girder erection machine for curve hole passing and positioning
Because the radius of the ramp curve is smaller, the bent cap of each pier abutment is arranged into a fan-shaped structure, and the included angle between the central line of the bent cap and the end surface of the precast beam is 5 degrees; a first column transverse moving track and a second column transverse moving track of the bridge girder erection machine are balanced in the girder erection process, and in order to meet the requirement of transverse movement of the inner edge beam and the outer edge beam, when a first column and a second column are arranged, an included angle of 5 degrees is formed between the first column transverse moving track and the second column transverse moving track and the center line of the bent cap. Refer to fig. 9 a schematic diagram of the through hole in place state of the bridge girder erection machine.
2) Prefabricated T-beam transportation and beam erecting operation
And sequentially erecting the inner edge beam, the secondary inner edge beam, the outer edge beam and the secondary outer edge beam according to the beam erecting sequence, and finally erecting the middle beam to finish the erecting operation of the one-hole bridge.
The prefabricated T-beam adopts a hoisting method of arranging a hoisting hole to penetrate through the bottom of the beam. And a bottom-pocket hoisting mode is adopted, and steel wire ropes penetrate through the bottom plate of the prefabricated T-shaped beam from hoisting points at two ends of the beam body, bypass the wing plates of the prefabricated T-shaped beam and are clamped into clamping rings at the top ends of the lifting appliances. Because the ramp curve radius is less, prefabricated T roof beam both sides boundary beam pterygoid lamina size deviation is great, in order to guarantee the stability that the boundary beam lifted by crane, when prefabricating the boundary beam, need reserve the hole for hoist in boundary beam web both sides to guarantee the stability that the boundary beam lifted by crane.
3) Feeding and dropping operation
a. A front lifting beam crane lifting beam;
referring to fig. 10, a third column is horizontally turned to the rear, a track beam transporting vehicle transports a prefabricated T-beam to the rear of a second column, a bridge girder erection machine is adjusted to realize the transverse movement of the whole bridge girder erection machine, a front hanging beam travelling vehicle is positioned right above one end of the prefabricated T-beam, and the distance between the front hanging beam travelling vehicle and a transverse rail of the second column is about 3.5m at the moment;
the front hoisting beam crane hoists the beam piece, and the inclination angle of the beam piece is kept to be not more than 20 degrees; then the front hanging beam travelling crane and the rear track beam transporting vehicle advance simultaneously, and the speed of the track beam transporting vehicle is matched; in the advancing process, the travelling of the front hanging beam is the track of the machine arm, and the travelling of the rear track conveying beam is the track of the prefabricated T beam, so in the process, the transverse movement of the whole machine is adjusted to adjust the position of the prefabricated T beam, and the scraping between the prefabricated T beam and the column body of the second column is prevented. Meanwhile, in the adjusting process, the perpendicularity (not more than 0.5%) of the first column is guaranteed, and the longitudinal moving oil cylinder above the first column curved beam is adjusted in time after the first column curved beam is inclined, so that the perpendicularity of the first column is adjusted.
b. A rear suspension beam crane suspension beam;
referring to fig. 11, when the rear rail girder transport vehicle reaches the lifting position of the rear suspension girder travelling vehicle, the other end of the prefabricated T-beam is lifted and lifted by the rear suspension girder travelling vehicle, so that the prefabricated T-beam is in a horizontal state, at the moment, the front suspension girder travelling vehicle and the rear suspension girder travelling vehicle move forward simultaneously, and the position of the second column is transversely adjusted in the travelling process, so that the prefabricated T-beam smoothly passes through the second column.
c. Erecting an inner edge beam and a secondary inner edge beam;
referring to fig. 12, when an inner edge beam is erected, in order to ensure the stability of the whole bridge girder erection machine and prevent the bridge girder erection machine from overturning, the central points of a first column and a second column of the bridge girder erection machine on corresponding transverse rails must not exceed a capping stop block and the outermost edge of a bridge floor, so that the situation that the bridge girder erection machine turns on one side due to outward exploration of the bridge girder erection machine is avoided, and therefore, in the girder falling process, the first column transverse rail and the second column transverse rail should be transversely moved in place, and after transverse rail wheels of the first column and the second column are locked, the transverse rail cylinders of the curved girders are adjusted to be accurately positioned, and the safety of the girder erection is ensured.
When the transverse rail wheel of the first column reaches the most edge of the capping beam, the distance between the transverse rail wheel of the second column and the most edge of the bridge floor is 22cm, the central line of the curved beam and the central line of the support meet the beam falling requirement, and the inner edge beam can be directly transversely moved in place by a bridge girder erection machine.
After the inner side beams are erected, secondary inner side beams are erected, and then the transverse partition plate steel bars between the two prefabricated T-shaped beams are welded to guarantee stability of the beam body.
e. Erection of outer edge beam and secondary outer edge beam
Referring to fig. 13, when the outer edge beam is erected, the first column of the bridge girder erection machine moves to the extreme edge of the capping beam 26, and the distance from the center line of the curved beam at the second column to the center line of the capping beam support is 49cm, so that the prefabricated T-beam piece cannot fall on the support cushion. In order to ensure the safety of the bridge girder erection machine, the prefabricated T beam close to one end of the first column is temporarily dropped on the support base cushion, the prefabricated T beam close to one end of the second column is dropped on the transverse moving track, and a jack is adopted to be matched with the transverse moving track to move in place.
As shown in fig. 14 and 15, the traverse rail here is a 43 # steel rail 31, a roller row 32 and a sliding plate 33 are sequentially arranged on the steel rail 31, and the roller row 32 is processed by 50cm round steel and 2cm steel plates; one end of a prefabricated T beam to be erected is placed on the sliding plate 33; the prefabricated T-shaped beam is stably fixed on the sliding plate, a 15T jack is used for performing transverse moving operation on the prefabricated T-shaped beam, and after the transverse moving operation is completed, two QYL 32-ton jacks are used for synchronously unloading the prefabricated T-shaped beam to the beam erecting position.
The specific incremental launching construction operation steps are as follows: the prefabricated T-beam is placed on the sliding plate, the cushion plate needs to follow the cushion plug in time in the pushing process, the horizontal pushing force is predicted according to the fulcrum counter force calculated by the middle beam of the prefabricated T-beam, the pushing force is gradually increased according to the required pushing force until the beam body moves forwards, and the pushing force of the jack is properly reduced after the beam body starts to move, so that the beam body is pushed forwards in a balanced manner.
In the pushing process of the beam body, the deviation of the center line of the beam body is controlled in a lateral limiting mode within 10mm along with the pushing of the beam body, in the T beam pushing process, the deviation of each abutment and the position of the center line of the beam body are tracked and measured, the pushing speed is controlled, a limiting device is arranged between a slideway of the transverse moving track and the abutment to prevent large movement during pushing, hard wood blocks are adopted between the limiting device and the abutment to be tightly filled, and the transverse moving distance is prevented from exceeding the position of the center line of the abutment.
The specific beam-falling construction operation comprises the following steps: after the prefabricated T-beam is transversely pushed in place, a jack is used for jacking the prefabricated T-beam, the transverse moving track is drawn out, after a beam body is jacked in place, a jack oil valve is locked, longitudinal and transverse position deviation of the prefabricated T-beam is rechecked, the support 24 is installed on the support cushion stone 25, the jack is slowly decompressed, and the prefabricated T-beam slowly falls onto the support. Fig. 16 is a schematic structural diagram of erection of the prefabricated T-shaped beam on the abutment.
After the outer edge beam is erected, the secondary outer edge beam is erected, and the two diaphragm plate reinforcing steel bars of the two precast beams are welded to ensure the stability of the beam body.
f. Middle beam erection
The speed of falling the beam is slowed down in the process of erecting the middle beam, and the phenomenon that the beam body topples due to collision between the middle beam and other beam pieces is prevented.
And after the middle beam is erected, constructing a bridge deck system in time, and then erecting and constructing the next hole beam.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. used herein refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the products of the present invention are used, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The overhead construction method of the low-clearance small-curve single-guide-beam bridge girder erection machine is characterized in that the single-guide-beam bridge girder erection machine is adopted for erecting a precast beam, and comprises a horn, a curved beam, a zero column, a first column, a second column, a third column, a hanging beam travelling crane, a first column transverse moving track and a second column transverse moving track, wherein the curved beam comprises a front curved beam and a rear curved beam, and the hanging beam travelling crane comprises a front hanging beam travelling crane and a rear hanging beam travelling crane;
the construction method comprises the following steps:
transporting the assembled bridge girder erection machine to the bridge head position of a precast beam to be erected;
carrying out hole passing operation on a bridge girder erection machine; the method comprises the steps of supporting a first column on a front abutment and supporting a second column on a bridge floor close to the abutment; in the hole passing operation of the bridge girder erection machine, the first column is arranged on the first column transverse moving track, and the second column is directly placed on the bridge floor;
beam feeding operation; horizontally overturning a third column, overturning the third column to the rear, transporting a precast beam to be erected to the rear position of the second column, hoisting the precast beam by a front hoisting beam crane, hoisting a movable tray on a track beam transporting vehicle along with the precast beam when hoisting the precast beam, synchronously feeding the beam by a rear track beam transporting vehicle and a front hoisting beam crane, and hoisting the precast beam by a rear hoisting beam crane when the other end of the precast beam moves to the rear hoisting beam crane position;
beam falling operation; during beam falling operation, firstly temporarily placing the prefabricated T-beam on the erection position of the middle beam, then placing a second column on a second column transverse moving track, and enabling the whole bridge girder erection machine to transversely move to the beam falling position through transverse operation of the first column and the second column on the first column transverse moving track and the second column transverse moving track respectively, re-hoisting the prefabricated beam, and transversely moving the prefabricated beam to the erection position to fall the beam;
and (5) carrying out alignment operation on the precast beam bodies to sequentially complete erection of the precast beams.
2. The overhead construction method of the low clearance, small curve single guide beam bridge girder erection machine of claim 1, wherein the operation of the bridge girder erection machine via hole comprises the steps of:
a. respectively connecting a front hanging beam travelling crane and a rear hanging beam travelling crane with a front curved beam and a rear curved beam, removing the connection between the curved beams and the machine arm, and well supporting a first column on an abutment close to a bridge deck;
b. lifting the third column and driving the machine arm to move forwards;
c. supporting a third column, collecting the second column to enable the second column to transversely move the track to the ground, driving the second column to move forwards to a position which is away from the center of the first column by a certain distance, supporting the second column stably, and collecting the third column;
d. the hanging beam crane drives the machine arm to move forwards, so that the zero column moves to the front pier position, and the zero column is lifted so that the height difference between the front end of the machine arm and the first column is-50-150 mm;
e. lifting the third column to enable the rear end of the machine arm to be 0-100 mm higher than the first column, collecting the second column, driving the second column to move the second column to the position of the frame beam, and directly stabilizing the second column on the bridge floor close to the abutment;
f. receive a post, drive a post motion with a post removal the place ahead pier stud beam position, prop up a post on a post sideslip track and on the pier of the place ahead steady.
3. The low clearance, small curve single nose bridge girder erection machine overhead construction method of claim 2, wherein during the operation of the bridge girder erection machine via hole, the levelness of the horn is adjusted to make the levelness of the horn not more than 0.5% all the time; when the zero column and the first column are supported, the verticality of the zero column and the first column is adjusted to be not more than 0.5 percent all the time.
4. The low clearance, small curve single guide beam bridge girder erection machine overhead construction method of claim 2, wherein in the bridge girder erection construction of the small radius curve ramp, when the first column and the second column are arranged in the operation of the bridge girder erection machine via hole, the included angle between the first column and the second column and the central line of the bent cap of the corresponding abutment is 3-5 degrees.
5. The overhead construction method of a low-clearance and small-curve single-guide-beam bridge girder erection machine as claimed in claim 4, wherein the capping beam of each pier abutment is arranged to be of a fan-shaped structure, so that an included angle of 3-5 degrees is formed between the central line of the capping beam and the end face of the precast beam.
6. The low-clearance and small-curve single-guide-beam bridge girder erection machine overhead construction method as claimed in claim 1, wherein in the beam feeding operation step, the front suspension beam crane lifts the precast beam, the inclination angle of the precast beam is kept to be not more than 20 degrees, the front bridge crane and the rear rail girder transport vehicle synchronously advance, and the transverse movement of the whole machine is synchronously adjusted to adjust the position of the precast beam in the advancing process;
when the rear track beam transporting vehicle reaches the rear hanging beam traveling vehicle to play a position, the rear hanging beam traveling vehicle lifts the precast beam to enable the precast beam to be in a horizontal state, the hanging beam travels forwards while the hanging beam travels, and the column II is transversely adjusted in the traveling process to enable the precast beam to smoothly pass through the column II.
7. The overhead construction method of a low-clearance small-curve single-guide-beam bridge girder erection machine as claimed in claim 6, wherein the perpendicularity of the first column is ensured to be not more than 0.5% all the time in the process of adjusting the transverse movement of the whole machine, and when the first column is inclined, the longitudinal shifting oil cylinder above the curved beam of the first column is adjusted in time to adjust the perpendicularity of the first column.
8. The low-clearance, small-curve, single-guide-beam bridge girder erection machine overhead construction method of claim 1, wherein in the construction of the bridge for the small-radius curve ramp, the girder erection is sequentially an inner side girder, a secondary inner side girder, an outer side girder, a secondary outer side girder and a middle girder, and the erection operation of the one-hole bridge is sequentially completed.
9. The low-clearance, small-curve single-guide-beam bridge girder erection machine overhead construction method of claim 8, wherein in the beam-falling operation, when erecting the inner side beam, the center points of the first column and the second column on the corresponding traverse rails do not exceed the corresponding abutment cap beam stop and the outermost edge of the bridge deck; in the beam falling process, the first column transverse moving rail and the second column transverse moving rail are transversely moved in place, transverse moving rail wheels of the first column and the second column are locked, and then the hoisted precast beam is adjusted to the beam erecting position through adjusting the curved beam transverse moving oil cylinder and then falls.
10. The low clearance, small curve single guide girder bridge erecting machine overhead construction method as claimed in claim 8, wherein in the girder lowering operation, when the outer girder is erected, the first column traverse rail wheel is moved to the most edge of the cap girder, then the precast girder near the end of the first column is temporarily dropped on the abutment padstone corresponding to the abutment, a traverse rail is provided on the abutment adjacent to the deck, the precast girder near the end of the second column is dropped on the traverse rail, and then the precast girder top is pushed to traverse to the girder erecting position and then the girder is lowered.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116289745A (en) * | 2023-02-23 | 2023-06-23 | 中交二航局第一工程有限公司 | inverted-V-shaped beam installation device of sewer slide and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116289745A (en) * | 2023-02-23 | 2023-06-23 | 中交二航局第一工程有限公司 | inverted-V-shaped beam installation device of sewer slide and construction method thereof |
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